Apparatus for measuring and/or controlling liquid levels
Abstract
Apparatus for measuring and / or controlling liquid levels. It is a device for measuring and / or controlling the level of a liquid, especially fuel, contained in a reservoir. The apparatus comprises means that support a pivot member within the reservoir, wherein the pivot member comprises a stationary body fixed with respect to the support means and a rotating body connected to a lever, the free end of which leads a buoy. The rotating body includes a permanent magnet and the stationary member houses a magnetic sensor located inside the magnetic field of the permanent magnet. The angular movement of the lever produces rotation of the magnet and is detected by the magnetic sensor, which sends signals to a microprocessor which, in turn, transmits these signals to external processing means. The processing means correlate these signals, which are proportional to changes in the liquid level, with the volume of liquid contained in the reservoir.
Term
Projected expiry 4 September 2028.
- Priority
- Filed
- Granted
- Today
- Projected expiry
13 claims: 1 independent, 12 dependent
- 1Reivindicações 1. Aparelho de medição e/ou controle do nível de um líquido, especialmente um combustível contido em um reservatório, caracterizado por compreender um membro de suporte posicionado no interior do reservatório e fixo com 5 relação a ele, uma alavanca que possui uma primeira extremidade conectada a uma bóia e uma segunda extremidade unida a um membro de pivô fixado ao mencionado membro de suporte, de tal forma que a alavanca possa mover-se em ângulo com relação ao mencionado membro de suporte à medida que o nível de líquido no reservatório sobe ou desce, em que o mencionado membro de pivô compreende um corpo estacionário fixado 10 ao mencionado membro de suporte e um corpo giratório unido à segunda extremidade da mencionada alavanca e que pode girar com relação ao corpo estacionário em volta de um eixo;um magneto permanente montado no mencionado corpo giratório, em que o campo magnético gerado pelo mencionado magneto é substancialmente perpendicular ao mencionado eixo;um par de sensores magnéticos dispostos no mencionado corpo 15 estacionário e dentro do campo magnético gerado pelo mencionado magneto, em que os mencionados sensores reagem ao mencionado campo magnético e emitem sinais que dependem do ângulo de incidência do campo magnético dos sensores, em que os mencionados sinais são transmitidos para meios de processamento externos ao reservatório, em que podem ser tomadas leituras que revelam o nível de líquido no 20 reservatório e, conseqüentemente, o volume de líquido do líquido nele contido.
- 2Aparelho conforme a reivindicação 1, caracterizado pelo fato de que os mencionados sensores magnéticos são compensados a 90° entre si.
- 3Aparelho conforme a reivindicação 1, caracterizado pelo fato de que o mencionado magneto permanente é substancialmente anular e coaxial 25 ao mencionado eixo, em que o mencionado magneto permanente é diametralmente magnetizado.
- 4Aparelho conforme a reivindicação 1, caracterizado pelo fato de que os mencionados sensores magnéticos são sensores magneto-resistivos.
- 5Aparelho conforme a reivindicação 1, caracterizado 30 pelo fato de que o mencionado membro de suporte é um cano de suporte vertical posicionado no interior do reservatório e isolado hermeticamente do líquido nele contido, em que o corpo estacionário do membro de pivô é fixado a uma parte intermediária do mencionado cano, o mencionado corpo estacionário compreende uma projeção cilíndrica que define uma haste em volta da qual o corpo giratório pode mover-se em ângulo e uma 35 cavidade na mencionada projeção cilíndrica que abriga os mencionados sensores, que são posicionados concentricamente com o mencionado magneto permanente anular.
- 6Aparelho conforme a reivindicação 3, caracterizado pelo fato de que o mencionado membro giratório inclui uma forquilha anular que possui 2/3 alto grau de saturação magnética em volta do mencionado magneto permanente e coaxial a ele, em que a mencionada forquilha evita a dispersão do campo magnético produzido pelo magneto.
- 7Aparelho conforme a reivindicação 5, caracterizado 5 pelo fato de que o mencionado cano de suporte contém um processador conectado aos mencionados sensores magnéticos e a um transceptor contido em um abrigo hermético, em que o mencionado transceptor é capaz de transmitir sem fios ou por meio de uma conexão com fio sinais emitidos pelo mencionado processador para meios de processamento externos;em que os mencionados meios de processamento 10 correlacionam leituras de nível com conteúdos de volume por meio de um gráfico de calibragem para o reservatório sendo controlado.
- 8Aparelho conforme a reivindicação 5, caracterizado pelo fato de que compreende um condutor que se comunica com o reservatório e projetase a partir dele, em que o mencionado condutor possui uma extremidade livre fechada 15 hermeticamente com uma tampa, a extremidade inferior do mencionado cano de suporte é fechada com um batoque e repousa contra uma parede do reservatório e a sua extremidade superior estende-se parcialmente para o interior do mencionado condutor e é hermeticamente fechada por um conector, em que o mencionado conector é conectado eletricamente ao mencionado processador e ao mencionado transceptor. 20
- 9Aparelho conforme a reivindicação 8, caracterizado pelo fato de que a mencionada tampa que fecha o mencionado condutor sustenta um abrigo que contém o transceptor e uma bateria que energiza o transceptor, em que o mencionado transceptor possui uma antena para transmitir sinais emitidos pelo processador para os mencionados meios de processamento externos. 25
- 10Aparelho conforme a reivindicação 5, caracterizado pelo fato de que compreende um sensor de temperatura posicionado na mencionada cavidade do corpo estacionário e ao lado dos mencionados sensores magnéticos, em que o mencionado sensor de temperatura é capaz de medir a temperatura dos sensores magnéticos e o mencionado sensor de temperatura é conectado ao mencionado 30 processador para compensar variações no sinal elétrico emitido por cada sensor magnético, dependendo da sua temperatura.
- 11Aparelho conforme a reivindicação 5, caracterizado pelo fato de que os sensores de temperatura são dispostos em níveis diferentes do mencionado cano de suporte e conectados ao mencionado processador para corrigir as 35 leituras do processador com base na temperatura em níveis diferentes do líquido contido no reservatório.
- 12Aparelho conforme a reivindicação 8, caracterizado pelo fato de que o sensor magnético e o sensor de temperatura são montados sobre uma 3/3 placa posicionada no interior da mencionada cavidade e o mencionado processador é montado sobre uma placa posicionada no interior do mencionado cano de suporte.
- 13Aparelho conforme a reivindicação 1, caracterizado pelo fato de que a bóia é conectada em pivô à primeira extremidade da alavanca, de tal 5 forma que a bóia possa mover-se com relação à mencionada primeira extremidade. 1/6 2/6
Independent claims13
94 paragraphs, as filed
(54) Title: EQUIPMENT FOR MEASURING AND / OR CONTROL OF LIQUID LEVELS (30) Unionist Priority: 06/09/2007 ar P20070103946 (73) Holder (s): Oscar Horacio Mundo (72) Inventor (s): Oscar Horacio World (57) Summary: Device for measuring and / or controlling liquid levels. It is a device for measuring and / or controlling the level of a liquid, especially fuel, contained in a reservoir. The apparatus comprises means that support a pivot member within the reservoir, wherein the pivot member comprises a stationary body fixed with respect to the supporting means and a rotating body connected to a lever, the free end of which leads a buoy. The rotating body includes a permanent magnet and the stationary member houses a magnetic sensor located inside the magnetic field of the permanent magnet. The angular movement of the lever produces rotation of the magnet and is detected by the magnetic sensor, which sends signals to a microprocessor which, in turn, transmits these signals to external processing means. The processing means correlate these signals, which are proportional to changes in the liquid level, with the volume of liquid contained in the reservoir.
<img file="BRPI0802777A2_D0001.tif" />
ΡΙ0802777 -3
Apparatus for measuring and / or controlling liquid levels
The present invention relates to an apparatus for measuring and / or controlling liquid levels. More specifically, the present invention provides an apparatus for measuring and / or controlling liquid levels which is particularly suitable for use in underground fuel tanks at gas stations and which can be installed in existing operating tanks without the need for significant modifications.
Background of the Invention
Gas stations typically have a series of fuel tanks that are usually installed about 90 cm below ground level and include a threaded pipe on top of the tank that allows access to fuel level measurements.
Fuels have a high volume expansion coefficient with temperature. This causes variations in the volume of fuel contained in them as the temperature of the fuel changes, even if there is no fluid entering or leaving the reservoir. This variation can easily be confused with fuel intake or discharge.
On the other hand, fuel leaks must be detected to protect the environment and the safety of people.
International regulations (such as the EPA Standard Assessment) set strict limits on minimum detectable leaks. These values can be up to 0.38 liters per hour of leakage in a reservoir of 30,000 liters.
Although fuel pumps can measure the amount of fluid that is released from a reservoir, they do not consider the temperature of the fluid, nor the entry of fluid into the reservoir, nor possible leaks or thefts that may occur. These needs can only be met by measurement systems with high precision that allow the computerized processing of level and temperature readings conducted automatically and continuously.
Objects of the Invention
An object of the present invention is to provide a device for measuring and / or controlling the level of liquids contained in reservoirs or tanks that is highly accurate, easy to install in existing tanks or reservoirs without the need for significant modifications, which consumes very little and allows the information obtained through wired or wireless connections to be obtained.
Another object of the present invention is the provision of an apparatus that has a digital electrical emission that allows the computerized processing of the emitted signals.
2/11
Yet another object of the present invention is the provision of an apparatus of the above type that has few moving parts and a small volume, allowing its installation in small spaces.
An additional object of the present invention is the provision of an apparatus of the above type which is intrinsically safe for use in explosive environments and which resists corrosion and aggressive environmental conditions.
Brief Description of the State of the Art
The most primitive method of measuring the fluid level employs a graduated rod that has marks every hundred, two or five hundred liters and is inserted vertically into a fluid reservoir unit until it reaches the bottom of the reservoir. The stick is then extracted from the reservoir and the volume of liquid is estimated based on the height of the stick's wet zone. This measurement method is very imprecise and inconsistent, in view of the variations (waves or ripples) on the surface of the liquid.
Measurement methods that use electric transducers are known in the art, where the main ones are those with capacitive or magnetostrictive effect and those that use pressure, ultrasound, radar or load cells. Of these, the only one that has been adapted to the needs of a precise measurement method for underground fuel tanks at gas stations is the level meter that uses the magnetostrictive effect.
This system is very expensive, requires considerable energy to operate and must be connected using special cables to a remote control station that has intrinsically safe electrical barriers, so that the entire system can operate in explosive environments.
Certain liquid level gauges that employ magnetic means to detect the position of a float are known. Among them, the following can be mentioned:
Published US Patent Application No. 2005/0247124 describes a device for measuring the level of fuel contained in a vehicle tank. This device comprises a magnetic sensor of the linear type that detects changes in the density of the magnetic flux, positioned between two polar pieces or stators and through which a magnetic flux generated by a rotating magnet connected to a lever and a float circulates. This patent application describes a method of construction of this device for isolating the influence of external magnetic fields and contamination by magnetic particles suspended in the liquid, which are produced, among others, by the vehicle's fuel pump. The sensor is external to the magnet and positioned in a space between the two polar pieces or stators.
3/11
United States Patent No. 6,993,968 B2. This patent describes an arrangement similar to that of US 2005/0247124 and describes means to prevent contamination of the magnetic device by magnetic particles suspended in the liquid. This means comprises holes in a magnetic rotor arranged in such a way that contaminating particles enter only through these holes and not between the rotor and the stator, as this would cause the system to lock up and also change the magnetic field.
European Patent No. EP 1450,142 A2 describes an arrangement very similar to that of US 2005/0247124.
U.S. Patent No. 6,915,690 B2 also describes an arrangement very similar to that of US 2005/0247124.
United States Patent No. 6,253,609 B1 describes a level gauge in which a float and a lever direct a mechanical transmission that causes a magnet to rotate outside the reservoir. The position of the magnet is translated by undisclosed means to detect the liquid level.
U.S. Patent No. 6,453,741 B1 describes a level measuring device that comprises a magnetic coupling between a magnet immersed in the liquid and another magnet outside the liquid, in which the latter contains an element that converts rotation into electrical signals ( potentiometer, Hall type sensor, etc.).
The patent documents mentioned above coincide in the use of a magnetic field strength sensor, such as a Hall type sensor, and the magnitude they measure is proportional to the strength of the magnetic field, which varies as the magnet rotates.
In addition, in the devices described by the technique mentioned above, the sensor is positioned outside the magnet and the magnetic flux is guided by polar pieces (stators).
All of the above provisions depend on the intensity of the magnetic field and, consequently, are sensitive to mechanical assembly or aging of the magnet.
All of the above disadvantages make it impossible to use these arrangements for measuring the level of a liquid with high precision and for a long period of time.
US Patent No. 6,508,119 B2 describes a fuel level measuring device contained in a reservoir that comprises a single magneto-resistive sensor positioned outside a magnet, close to the fuel reservoir wall and that changes the its resistivity when the magnet connected to a lever and float moves. As the magneto-resistive sensor
4/11 isolated is positioned outside the magnet, it has an electrical emission that is not directly proportional to the angle of rotation of the magnet. In addition, as a single sensor is used, compensation for temperature variations is very complicated. Consequently, this device requires complex calibration for each case in which accurate measurement is desired. On the other hand, this arrangement is not practical for existing underground reservoir installations because the external side of the reservoir wall is not accessible.
In its broadest aspect, the present invention provides a device for measuring and / or controlling the level of a fluid, especially a fuel contained in a reservoir, which comprises a support member positioned inside the reservoir and fixed with respect to it, a lever having a first end connected to a buoy and a second end attached to a pivot member fixed to said support member, such that the lever can move at an angle with respect to said support member as the liquid level in the reservoir rises or falls, wherein said pivot member comprises a stationary body attached to said support member and a rotating body joined to the second end of said lever and which can rotate with respect to the stationary body about an axis; a permanent magnet mounted on said rotating body, wherein the magnetic field generated by said magnet is substantially perpendicular to said axis; a pair of magnetic sensors arranged in said stationary body and within the magnetic field generated by said magnet, in which said sensors react to said magnetic field and emit signals depending on the angle of incidence of the magnetic field of the sensors, in which said signals are transmitted to processing media external to the reservoir, in which readings can be taken that reveal the liquid level in the reservoir and, consequently, the liquid volume of the liquid contained therein.
The level measuring device according to the present invention uses two magneto-resistive sensors, spatially compensated at 90 ° to each other and arranged coaxially with a diametrically magnetized annular magnet, whose intensity is sufficient to saturate the two magnetoresistive sensors. In this way, the electrical emission of the sensors depends on the angle of incidence of the magnetic field in relation to the sensors and is independent of the magnetization intensity of the magnet and its variations with time, being also insensitive to disturbances caused by external magnetic fields.
In addition, as the two sensors are integrated in the same encapsulation and have similar electrical characteristics, the temperature effect is compensated because, in order to calculate the angle of rotation of the magnet,
5/11 the mathematical division between the two electrical signals that are generated in space at ninety degrees is used, in order to obtain a result that is practically insensitive to temperature changes in the sensors.
The present invention will now be described with reference to the accompanying figures, which illustrate, as a form of non-limiting examples, preferred embodiments of the present invention.
Brief Description of the Figures
Fig. 1 shows a fuel level control and / or measurement installation that the apparatus according to the present invention employs.
Fig. 2 is a general view, enlarged in partial section, showing the measurement set in detail.
Fig. 3 is a cross section of the measuring device along the line ll-lll of Figure 2 that shows in more detail the pivot member that connects the lever connected to the buoy with a tube that houses a processor and its cabling. For clarity, the lever is displayed rotated 90 °.
Fig. 4 is a perspective view of the buoy and the way it is pivoted to the lever.
Fig. 5 schematically represents the interaction between the magnetic field generated by the magnet and the sensors.
Fig. 6 is a longitudinal section of the cover that supports the transceiver housing.
Fig. 6a shows an alternative embodiment in which the cover is separated from the transceiver housing.
Figs. 7 to 11 show alternative embodiments of the present invention.
Detailed Description of Preferred Achievements
Fig. 1 schematically shows a control installation and / or measurements of the level of a liquid, particularly fuel contained in an underground reservoir that generally has a cylindrical shape and is arranged with its longitudinal axis positioned substantially horizontally (in practice, with slight inclination to facilitate sedimentation of contaminants). A conductor 9 is attached to the top of the reservoir 6 and extends to a chamber 12 covered by a removable cover 66 which can be entered from the floor, for example, from a gas station. All of these elements are part of a conventional installation.
The level measuring apparatus according to the present invention comprises a support member comprising a vertical pipe 1, which has a lower end that rests on the wall of the underground reservoir and an upper end that extends into the conductor 9. The member
6/11 of support or pipe 1 has one or more spacers 7 (two are shown in the realization shown in Figure 1) that allow the maintenance of pipe 1 vertically or prevent movement of the pipe, which would cause its abandonment of the vertical position. Barrel 1 may have a round, square or rectangular cross section.
A lever 2, made of a light, rigid and strong material, such as aluminum or carbon fibers, is connected at one end to a pivot member 3 that allows the angular movement of the lever 2 with respect to a fixed point in the barrel 1 The other free end of lever 2 is pivoted to a buoy 4 that can move at an angle to the free end of lever 2. The combined weight of lever 2 and float 4 is selected in such a way that float 4 always fluctuates, regardless of the level and density of the liquid.
Spacers 7 comprise means (not shown) which prevent the rotation of the pipe 1 around its longitudinal axis and keep it in a position such that the lever 2 and the float 4 move in a vertical plane that contains the horizontal axis of the reservoir 6.
Barrel 1 is hermetically sealed to prevent liquid from entering; its lower end is closed with a toggle 36 that rests on the reservoir wall, while its upper end ends in an electrical connector 8 that allows the transmission of the signals generated by the level meter to a wireless transceiver 47 positioned in the chamber 12 using a cable 10. The housing 11 of the wireless transceiver 47 is airtight and hermetically sealed by a cover 15 that covers the upper end of the conductor 9 and therefore insulates the reservoir from the outside.
Inside the transceiver housing 11, there is a battery
14 of the type of intrinsic safety that provides the necessary energy for the operation of the transceiver 47 and the measuring device. Within the housing 11 of transceiver 47, there is an appropriate antenna 40 that allows the transceiver to communicate with remote signal processing equipment 16 which has an external antenna 13 that receives the signals emitted by the transceiver. The remote processing equipment performs equations between sixteen level and volume readings based on a calibration graph for the specific reservoir controlled by the apparatus in accordance with the present invention.
It will be understood that, by varying the level of the liquid contained in the reservoir 6, the float 4 will move up and down, causing the rotation of the lever 2 and, in turn, the rotation in the pivot member 3 .
As can be seen in Figures 2 and 3, the pivot member 3 comprises a stationary body 21 attached to the barrel 1 and a short rod 31 formed by a cylindrical projection extending from the stationary body 21 which
7/11 swivelly supports a swiveling body 60 attached to lever 2. The rod 31 has, next to its free end, a groove 62 in which a key 22 is located to prevent disengagement of the swiveling body 60 from the rod 31.
The rotating body 60 has cylindrical surfaces in stages, coaxial with the stem 31. A permanent ring-shaped magnet 20 is fixedly mounted on the end of the rotating body 60 next to the stationary body 21. The magnet 20 is surrounded by an annular fork 200 made of magnetic material with high magnetic saturation that concentrates the magnetic field generated by magnet 20 and acts as a shield to prevent the dispersion of the magnetic field out of the pivot member 3. The magnet 20 is magnetized diametrically and, preferably, it is manufactured with a material that has high resistance to magnetization and low demagnetization over time, such as SmCo (samarium-cobalt).
The stationary body 21 has a cylindrical cavity 30 coaxial with the stem 31 which communicates with the inner side of the pipe 1 through a hole 28 in the pipe, but that cavity 30 is hermetically insulated from the outside of the pipe 1.
The cavity 30 houses two magneto-resistive sensors 23 and 23 'positioned concentrically with the magnet 20 and within its magnetic field. The sensors 23 and 23 'are welded to a plate 27 which is fixed firmly to the stationary body 21 and fixed in position with an encapsulating adhesive 25. The plate 27 is coupled by means of a connector 29 to a main plate 26 arranged inside of pipe 1. Each of the sensors 23, 23 'has an electrical emission that can be read through the connector 29 by a processor 32 positioned on the plate 26. A temperature sensor 24 is also soldered to the plate 27 to detect the temperature of the sensors 23, 23 'and, in this way, compensate for thermal variations of the electrical signal emitted by each sensor 23, 23'. Temperature sensor 24 is also connected to processor 32 via connector 29.
The magnetic field generated by the permanent magnet is very intense and uniform in the vicinity of sensors 23 and 23 ', so that it exceeds the magnetic saturation value of sensors 23, 23' and makes the possible interference of disturbances of magnetic fields external to the meter insignificant. of level.
The sensors 23, 23 'are of the magneto-resistive type. Suitable sensors are, for example, those manufactured by Philips with the KM243T signature, in which two sensors are located in a single capsule and are spatially compensated at 90 degrees to each other. It would be possible, however, to use two independent sensors, compensated at an angle other than 90 °, with similar results. The magneto-resistive effect of sensors 23, 23 'when subjected to an intense magnetic field 201 (see Fig. 5) that exceeds its saturation value results
8/11 in an electrical emission that is proportional to the angle of incidence of the magnetic field 201 on each sensor and does not depend on the intensity of the magnetic field 201. As the sensors 23 and 23 'are compensated 90 degrees between them, the corresponding electrical signals will be proportional to the X and Y components of the magnetic field, which correspond to the rotation angle of the magnet 20.
These two electrical signals emitted by sensors 23, 23 'make it possible to calculate with great precision the angle between the lever and the support member and the level of liquid can be easily calculated according to that angle and the length of the lever 2.
Knowing the angle of rotation of the lever 2 and based on the length of the lever 2, the processor can calculate the level of liquid 5 contained in the reservoir 6. Other additional calculations allow to take into account variations in the float point of the float 4 depending on whether the lever 2 is or is not immersed in the liquid.
Figure 2 is a partial and enlarged section of the pipe 1 and pivot member 3, in which the wiring 33 inside the pipe 1 can be seen. The mentioned wiring transmits signals calculated by the processor 32 to the connector 8 and supplies battery power 14 for the level measuring device according to the present invention.
Inside the pipe 1, there is an internal tube 35 that supports the plate 26 and the temperature sensors 34, which are spaced along the pipe 1 and connected by means of conductors 37 and 38 to the processor 32. The tube 35 it allows and facilitates the assembly of all electrical components before being inserted in pipe 1 during the construction of the level measuring device.
Temperature sensors 34 emit signals read by the processor 32 and make it possible to know the temperature of liquid 5 at its different levels and to make corrections considering the expansion or contraction of the volume of the reservoir with temperature variations.
Figure 4 schematically shows the way in which float 4 is connected to the free end of lever 2. As can be seen, two arms
50, attached to the free end of lever 2, are connected to corresponding lateral pivots 51 provided in buoy 4, which, in the shown embodiment, has a prismatic shape. It is desirable to have a large floating surface to increase the measurement resolution and reduce the mechanical hysteresis of the lever movement.
The proposed design allows the float to always expose a maximum and constant fluctuation surface, regardless of the liquid level.
The width of the float is limited by the diameter of the conductor 9, but its length can be very long, as it can rotate to a vertical position and pass through the conductor 9.
9/11
Alternatively, the desired results with respect to the flotation area and its constancy can be achieved using a spherical buoy fixed to the free end of lever 2, but, in this case, the diameter of the buoy would be limited by the internal diameter of the conductor 9, because it needs to be introduced through it. In addition, a spherical buoy is more expensive than a prismatic buoy and the latter allows modifying its width to facilitate insertion through the conductor 9.
Figure 5 is a cross section of the pivot member 3 which schematically displays the interaction between the magnetic field 201 generated by the permanent magnet 20 and the sensors 23, 23 '.
Figure 6 shows, in more detail, the cover 15 of the conductor 9 that supports the housing 11 of the transceiver 47. The cover 15 is fixed by screws 41 and threads 42 to lobes that project radially from an intermediate cover 43 that has a central opening that is threaded to the upper end of the conductor 9. The transceiver housing 11, in turn, is fixed by screws 45 to the cover 15. A ring 44 between the cover 15 and the intermediate cover 43 guarantees the hermeticity of the assembly.
Figure 6a shows an embodiment in which the transceiver housing 11 is separated from conductor 9. In this alternative embodiment, conductor 9 is closed by a cap 61 which is threaded to the upper end of conductor 9 and the transceiver housing is attached to the cover 66 of the chamber 12 by means of a threaded projection 69 which is fixed to a threaded cavity in a retaining member 68. Transceiver 47 is connected to connector 8 by means of a cable 10 which passes through an opening in cover 61 which is equipped with a voltage release member 62 to ensure the tightness of conductor 9.
The construction of the pivot member 3 shown in Fig. 3 also allows for variations. In this way, in Fig. 7, a stationary body 71 is fixedly connected to the pipe 1 and a rod 72 that has an axial cavity 75 that contains the magnetic sensors 23, 23 'is fixed to the stationary body 71 by means of screws 76 A ring 70 provides an airtight seal. A threaded fastener 73 allows the connection between the rotating body 74 and the stem 72 to be maintained.
Fig. 8 shows another embodiment similar to that of Figure 7, in which a stationary body 80 is attached to the pipe 1 and a rod 81, which has an axial cavity 82 that contains the magnetic sensors 23, 23 ', is fixed to the body stationary 80 with an appropriate adhesive.
Fig. 9 shows yet another embodiment of the pivot member 3 in which a stationary body 90 is attached to the barrel 1 and serves as a rod for the rotating body to which lever 2. The rod is tubular and a cylindrical member 91, what
10/11 has an axial cavity that houses sensors 23, 23 ', is inserted into the hole in the rod and held in place by a fastener 73.
Fig. 10 shows yet another embodiment of the pivot member 3 in which a stationary body 100 that has an axial cavity that houses the sensors 23, 23 'is connected to the pipe 1 and has an extension 104 in which a set screw is threaded. 102. A rotating body 103 that transmits the movement of lever 2 has a rod 101 attached to it. The ends of the rod 101 are supported by corresponding pivots 105, 106 provided on the stationary body 100 and on the screw 102, respectively.
Fig. 11 shows an additional realization of the pivot member 3 which is similar to that of Figure 7. The stationary body 110 is fixed to the barrel 1 and has an integral projection that defines a rod on which a rotating body 112 is mounted, leading the ring magnet 20 and the fork 200. A fastener 73 prevents disengagement of the stationary and rotating bodies.
It will be understood that other constructive variations are possible, which those skilled in the art can easily idealize, provided that these variations are within the spirit and scope of the present invention, as defined in the appended claims.
The permanent magnet does not need to be annulled. It will suffice that it creates a magnetic field perpendicular to the axis of rotation and the magnetic sensors can react to perpendicular components of that magnetic field.
Although in the displayed and described realization the signals emitted by the magnetic sensors are transmitted wirelessly to external processing means, this transmission may be wired. Wireless transmissions facilitate the installation of the level meter according to the present invention in existing fuel tanks.
Occasionally, external water may leak into the fuel tanks. This water, being more dense than fuel, would tend to be concentrated in the lower part of the reservoir. It is important to detect the existence of water and avoid accidentally supplying it to a vehicle with the fuel, as this can cause serious damage to the engine. To avoid this situation, a level meter similar to the one described above, but much smaller, can be installed at the bottom of the pipe 1. The float of this additional level meter would be arranged on the intermediate surface between the water and the fuel.
It will be understood that the present invention, although described and displayed with respect to the measurement and / or control of the fuel level in
11/11 underground reservoirs, may also be used for the measurement and / or control of other liquids in other environments, either above or below ground level.
1/3
8 members in 5 offices
Priority claims1
| Document | Office | Kind | Date |
|---|---|---|---|
| P070103946 | Argentina | A |
Members8
| Document | Office | Kind | |
|---|---|---|---|
| AR062689A1 | Argentina | A1 | |
| CA2639317A1 | Canada | A1 | |
| US2009064777A1 | United States of America | A1 | |
| MX2008011317A | Mexico | A | |
| BRPI0802777A2This record | Brazil | A2 | |
| US8136396B2 | United States of America | B2 | |
| CA2639317C | Canada | C | |
| BRPI0802777B1 | Brazil | B1 |
6 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Lapse because of non-payment of annual fees (definitively: art 78 iv lpi, resolution 113/2013 art. 12)LapsedEM VIRTUDE DA EXTINCAO PUBLICADA NA RPI 2738 DE 27-06-2023 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDA A EXTINCAO DA PATENTE E SEUS CERTIFICADOS, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013.B24J | B24J | |
| Lapse acc. art. 78, item iv - on non-payment of the annual fees in timeLapsedREFERENTE A 15A ANUIDADE.B21F | B21F | |
| Decision: intention to grant [chapter 9.1 patent gazette]B09A | B09A | |
| Formal requirements before examination [chapter 6.20 patent gazette]B06T | B06T | |
| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]B06F | B06F | |
| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]B03A | B03A |
Numbers
- Application
- 8027773
Titles2
- Portuguese
- aparelho de medição e/ou controle dos nìveis de lìquidos
- English
- apparatus for measuring and / or controlling liquid levels
Classification
- CPC, 1
- G01F23/38
- IPC, 2
- G01F23 38
- B67D7 06