Positive pressure type air respirator

Positive pressure air respirator

Technical field

[0001] The present invention relates to a personal protective air respirator for fire fighting and rescue, and more particularly to an air respirator for use in an emergency such as fire, dust and toxic gas.

Background technique

[0002] Positive pressure air respirators are firefighters and rescue workers in the event of fire fighting and rescue, in order to prevent inhalation of harmful aerosols, toxic gases, suspended in the air of harmful substances or under hypoxia used in a Air respirator. Positive pressure air respirator can effectively prevent the outside of the mask outside the toxic gas intrusion into the hood, with high safety and reliable protection performance, it mainly includes compressed air bottles, bottle head pressure reducing valve, carrying the backplane and comprehensive The hood is provided with a supply valve for supplying breathing air to the hood, which is opened or closed with the user's breathing so as to allow the reduced air to pass through the mask for human use. The gas supply stability and the breathing resistance of the air supply valve are important for the comfort and safety of the entire air respirator.

[0003] The supply valve is one of the key components of a positive pressure air respirator, which is directly related to the performance of the air respirator, as well as the user's breathing smoothness and safety. Chinese invention patent 89210025.7 discloses a positive pressure type positive pressure ventilator which is mainly composed of a diaphragm, a lining plate, a rocker, an intake valve and a pressure spring. When the user draws air, the suction negative pressure Drive the diaphragm and the lever together to move down, the diaphragm down and then push the rocker to open the intake valve, the supply valve to the air inside the mask, this structure due to the use of inspiratory negative pressure to push the diaphragm in turn, Lever and rocker to open the intake valve block and the gas into the hood, the linkage mechanism, low sensitivity, and need to be specially trained; especially the gas is through the rocker skew to make the air supply valve block slanting gap Supply, sealing lax, prone to leakage, both a waste of fresh air sources, and may cause harmful gas infiltration. The opening or closing of the supply valve in the above structure depends on the position of the rocker. When the respirator is in the non-use state, the rocker may also be unstable in the movement or placement of the mask, which may cause the intake valve to seal tightly And produce a leak. The invention also discloses a "positive pressure air respirator supply valve" which also includes a diaphragm, a piston, a piston body, a return spring and a transmission mechanism. When used, the diaphragm acts on the piston end through the transmission mechanism, The other end of the piston connected to the valve head, the valve head controls the opening or closing of the valve port, although the structure has a good sealing performance, and the structure is more compact, but the control valve head drive mechanism complex, drive resistance and valve closure open So the respiratory resistance is large, to adapt to the crowd is limited, thus affecting its practicality; at the same time in the non-use of the situation, but also the lack of effective locking of the valve head, easy to form a valve port leakage.

The contents of the invention

According to the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a positive pressure type air respirator whose face mask supply valve is not only action sensitive, has small respiratory resistance, To achieve a reliable seal lock.

In order to solve the above-mentioned technical problems, the positive-pressure air respirator of the present invention includes a backplane assembly and a cylinder assembly fixed to a backplate assembly which is supplied via a relief valve assembly and a face mask The air hose is directed to a ventilator supply valve which is mounted on the face mask, and the breather supply valve includes a supply valve body and is fixedly mounted on the air supply valve body through the air supply valve cap And an air duct is fixedly mounted on the air supply valve body, and an air duct is slidably mounted on the air guide slide, and the outer end of the air pipe is provided with a gas supply gasket, The gasket is mounted on the air guide slide; the air supply pipe is sealed with the air supply pipe through the gas supply gasket; the inner end of the air pipe is connected with the air supply rod And the inner end of the gas supply rod is movably connected to the locking hook, and the gas supply tension spring is installed between the locking hook and the air supply valve body; a locking plate is fixedly mounted on the air supply valve body, The locking plate is provided with a locking hole, the hook of the locking hook The air supply lever is connected with the outer end of the gas supply rod; and the air supply lever is connected with the outer end of the air supply rod, and the air supply lever is connected with the outer end of the gas supply rod, And a lock hook push rod is arranged on the air supply valve body, and the front end of the lock lever is provided with a lock hook and reset spring corresponding to the locking hook corresponding to the lock hook and the air supply valve body; And the inner end of the bypass valve stem is connected with the sealing seat, and the outer end of the bypass valve stem is connected with the bypass valve hand wheel, and the bypass valve Connected to the air guide plate.

In the above-described structure, the air supply gasket is provided on the outer end of the air guide pipe on the face of the positive pressure air respirator, and the air pipe is slidably supported on the air guide plate The trachea along the axial reciprocating sliding, the outer end of the air pipe nozzle and the gasket when the separation of the formation of ventilation gap, the two will be closed when the gas line, in the air through the gas pipe and the seal Valve structure, the air pipe nozzle and gas supply gasket to form a reliable seal between the ring, not only makes the air supply valve ventilation, breathing resistance is small, greatly improving the use of comfort, and close tight, good protection, To achieve reliable closure of the gas valve or open. And the other end of the gas supply lever is connected to the diaphragm which reciprocates with the user's breathing and responds to the pressure in the air supply valve when the air is exhaled, and the other end of the gas supply lever is connected with the gas lever on the air supply valve. Ambassador to the outside of the diaphragm, the diaphragm through the gas supply lever to push the air pipe close to the gas seal to cut off the gas path; When the diaphragm is inwardly moved, the airway exerts the air supply gasket with the gas supply duct by means of the gas supply extension, which forms a gas supply gap between which the fresh air provides fresh air to the user through the gap, Air lever force amplification effect, easy breathing action can be leveraged to promote the airway movement, effectively improve the movement of the airway sensitivity, airway movement flexibility, reducing the respiratory resistance. And a locking plate is provided on the air supply valve body, and the locking plate is provided with a locking hole, and the hook portion of the locking hook can be caught in the locking hole, and when the supply valve is in the non-use state, So that the hook of the locking hook is engaged with the locking hole of the locking plate, and the locking hook is always attached to the air supply gasket through the gas supply lever so that the air supply valve is in a reliable closed state, , And the supply valve needs to enter the use state, the inwardly agitated diaphragm touches the top of the hook hook of the locking hook, the hook of the locking hook is disengaged from the locking hole into the normal breathing air supply state, In the air supply valve of the present invention, since the bypass valve stem for supporting the gas supply gasket is supported on the air guide slide, the bypass valve The valve wheel can be driven by the bypass valve seat and the gasket on the gasket from the airway, compressed air bottles in the new air can be smoothly into the mask for human use, without the airway, Gland structure composed of the control valve, so that when the valve fails, the user can still ensure the intake of fresh air in a critical environment, thus greatly enhancing the safety and reliability of use. The ventilator valve of the invention has the advantages of compact design, flexible operation and reliable, small respiratory resistance and safe and reliable use.

[0007] According to a further embodiment of the present invention, the relief valve assembly is mounted at the mouth of the cylinder assembly, and a high pressure air interface and a low pressure air interface are provided on the valve body of the pressure reducing valve assembly, The air interface is communicated with the residual display alarm device, and the low pressure air interface is connected with a mask air supply hose and a rescue air pipe in parallel therewith. The structure can promptly remind users of compressed air in the user's air cap, so as to protect the safety of users; but also in the crisis when they share a compressed cylinder, the implementation of his rescue.

[0008] According to a further embodiment of the present invention, a digital display is mounted on the mask. So that users do not have to bow, you can see the window to see the use of gas cylinders and other important information to ensure the safety of users.

According to a preferred embodiment of the present invention, the locking hook is provided with a waist-shaped hole into which the inner end of the gas supply lever is engaged with the waist hole of the locking hook, The gas supply lever is pivotally supported on the air supply valve body by a lever support, and the air supply lever is mounted on the air supply lever. Locking hooks on the waist hole and tie rod compression spring can ensure that the use of conditions, breaths when the gas pipe and gas tightly sealed, so as to improve its sealing performance, the structure also improves its assembly performance, easy to manufacture and assembly. The structure is simple and reasonable, easy to make and assembly.

According to a further embodiment of the present invention, an air supply passage is provided on the air guide slide, and a seal ring is provided on both sides of the annular air supply passage, and the air supply pipe joint passes through the seal ring Is sealingly mounted on the air guide slide and the air supply passage of the air supply pipe joint is communicated with the air supply passage on the air guide slide. Seal structure is simple and reasonable, and through the gas pipe fittings to the supply valve flexible multi-directional gas.

[0011] According to a further embodiment of the present invention, the bypass valve stem is hermetically supported by a valve stem seal seal on a airway slide rail, and a bypass spring is provided on the bypass valve stem; Between the valve hand wheel is equipped with positioning ratchet pawl mechanism. Reasonable structure, easy to use and operation.

[0012] According to a preferred embodiment of the present invention, the backplate assembly comprises a back plate body provided with a back plate rib at a symmetrical line position of the back plate body, and a support and a gas The lower end of the back plate body is fixed with the anti-collision pad; the belt body is also connected with a belt and a cylinder fixed belt, the belt through the waist buckle The shoulder strap is connected to the upper end of the body of the back plate, and the other end of the shoulder strap is connected to the waist belt. In the above structure, since the back plate rib is provided on the back plate body and the support and the cylinder lower support are provided on the rib reinforcement, on the one hand, the provision of the back plate rib is not only improved Stiffness and strength, for the cylinder to provide a reliable support; and back plate ribs can reduce the weight of the back plate and materials, effectively reduce the burden on users to exercise and improve the user's work comfort and operating time; The upper and lower seats and cylinders can be reliably fixed to the cylinders, and the setting of the upper and lower bearings of the cylinders changes the uncertainty of the traditional backplane to the fixing of the cylinders, Cylinders fixed more secure, to avoid the use of gas cylinders in the back of the shaking, both to increase the use of safety performance, but also improve the use of comfort. And because of the shoulder strap and belt corresponding position on the addition of the shoulder pad and waist pad, to avoid the shoulder strap and belt and the body of the force, to ensure that the strap and belt with the body fully fit, to avoid the cylinder shake The burden of the center of gravity caused by discomfort, wear more comfortable. The bottle body is provided on the back plate body, and the bottle hand hole is provided on the main body of the back plate to facilitate the user to lift and wear the air respirator device, Easy to grasp holding, and is located in the bottom of the back of the body of the anti-collision pad, can effectively reduce the unloading back when the backplane body with the impact of the ground vibration, both to prevent the cylinder in the backplane movement channeling, The cylinder and the bottle head pressure on the ground caused by damage to the impact of insecurity. Therefore, the backplane assembly of the present invention is not only convenient to handle, but also has a safe and safe use for both the bottle body and the back plate.

[0013] According to a further embodiment of the present invention, the back plate body is provided with a bottle head valve seat which is located above the impact pad. Can be on the cylinder and bottle head valve for reliable fixed and effective protection.

According to a preferred embodiment of the present invention, there are two shoulder strips each provided on both sides of a back body; the belt ends of the belts extend toward both sides of the back plate body, respectively, And the waist pad is inserted from the belt position on the side of the back body to the other side belt of the back plate body. Shoulder shoulder weight uniform, bear light and comfortable; bear fixed solid, bear the comfort.

According to a further embodiment of the present invention, the two belt ends of the cylinder fastener tape extend respectively on both sides of the back plate body, one end of which is a connecting ring, and the other end of the cylinder fastener is connected with a thorn And the position of the bearing on the cylinder corresponds to the position of the cylinder fixing belt. Can achieve reliable support for the cylinder fixed, and fixed convenience.

Description of the drawings

[0016] The positive pressure type air respirator of the present invention will be further described below with reference to the drawings and specific embodiments.

1 is a schematic structural view of a specific embodiment of a positive pressure type air respirator according to the present invention; Fig. 2 is a schematic view showing a structure of a breather supply valve in a positive pressure type air respirator of the present invention; Figure 4 is a schematic view of a concrete embodiment of a backplane assembly in a positive pressure type air respirator of the present invention; Figure 5 is a schematic view of a structure of a respirator supply valve as shown in Figure 2; Figure 6 shows the enlarged structure of the B-B profile in the structure shown in Figure 4.

[0018] In the figure, a gas cylinder assembly, a 2-back plate assembly, a 201-back plate body, a 202-lumbar fastener tape, a 203 belt, a 204 waist pad, a 205- Clawed buckle, 207 - shoulder pad, 208 - shoulder strap, 209 - cylinder bearing, 210 - connecting ring, 211 - back rib, 212 - bottle hand hole, - cylinder under the bearing, 215 - bottle head valve seat, 216 - anti - collision pad, 3 - pressure valve assembly, 4 a rescue valve, 5 - mask air supply hose, 6 - Supply valve, 601 - supply valve body, 602 - lock hook putter reset spring, 603- lock hook putter, 604 gas supply yellow, 605-diaphragm, 606-clamp hoop, 607- Top cover, 608 - top cover, 609 - top cover air hole, 610 - air supply stem seat, 611 - locking hook, 612 - rod compression spring, 613 - gas supply lever, 614 - lever waist hole, 615 - 616-lever support, 617-air guide, 618-airway, 619-slip seat, 620-gas supply gasket, 621-seal seat, 622-bypass compression spring, 623- Bypass valve hand wheel, 62-4 bypass valve , 625-reed, 626-bypass cap, 627-stem seal, 628-air supply fitting, 629-locking hole, 630-lock plate, 631-mask valve seal, 7-mask, 8- Instrument, 9 a residual display alarm.

detailed description

A positive pressure type air respirator as shown in Fig. 1 includes a back plate assembly 2 in which a cylinder assembly 1 is bundled and a cylinder head of a cylinder assembly 1 is provided with a reduced pressure Valve assembly 3, in the valve assembly 3 of the valve body is equipped with high pressure air interface and low pressure air interface, the high pressure air interface and the residual display alarm device 9 connected; low pressure air connection on the mask with a soft air supply Tube 5 and he rescues the air supply tube 4. The compressed air in the cylinder assembly 1 is connected to the respirator air supply valve 6 through the relief valve assembly 3 and the face mask air supply hose 6, and is mounted on the face mask 7 through the facepiece valve seal valve 63 through the face mask valve 61. As shown in Fig. One end of the mask air supply hose 5 is connected to the low pressure air port of the pressure reducing valve assembly 3 and the other end thereof is connected to the air supply pipe joint 628 of the breather supply valve 6. The face mask 7 is provided with a digital display device 8, which is a HUD head digital display, located below the mask window of the face mask 7.

The air supply valve 6 of the positive pressure type air respirator as shown in Fig. 2 includes an air supply valve body 601 made of injection molding, and the lower end of the air supply valve body 601 has a tubular structure through which the tubular portion And its type 0 seal will be connected to the gas valve on the mask body. A diaphragm 605 is provided in the upper portion of the air supply valve body 601, and a supply valve cover 607 is provided above the mouth of the air supply valve body 601, and the diaphragm 605 is fixedly clamped On the air supply valve body 601, the air supply valve body 601 and the air supply valve cover 607 are fixedly connected to each other by the clamps 606. A plurality of top cover air holes 609 are provided at the top of the air supply valve cover 607, and a cap cover 608 is mounted on the inside of the air supply valve cover 607.

The air guide plate 617 is fixedly mounted on the left side of the air supply valve body 601, and the air guide plate 617 has a substantially circular tubular structure with a center line perpendicular to the center line of the pipe portion of the air supply valve body 601. And an annular air supply passage is provided on the outside of the middle portion of the air guide slide 617. The bottom of the air supply channel is provided with a plurality of ventilation holes through the airway of the airway, and the slide seal ring 619 is mounted on both sides of the annular air supply passage, and the slip ring Mg is a zero type sealing ring, The air supply pipe joint 6 is hermetically mounted on the air guide saddle through the two carriage seals ei9, and the pipe & amp; air supply passage of the air supply pipe joint 628 is communicated with the annular supply passage of the air guide plate slip 7, The centerline of the tubular air supply passage of the air supply pipe joint 628 is perpendicular to the center line of the pipe portion of the airway slide 617. The air supply pipe joint 628 communicates with the pressure regulating valve on the compressed air cylinder through the supply hose.

The air guide pipe 618 is slidably mounted at the core position of the air guide slide 617, and the air pipe 618 is a circular tubular metal pipe, and the gas supply gasket 620 is provided at the right outer end nozzle position of the air guide pipe 618 And the gas supply gasket 620 is movably supported and mounted on the air guide slide 617 through the gasket 621. The sealing seat (321 is fixedly mounted at the left end position of the bypass valve stem 624 which is sealedly mounted on the right side of the pipe hole of the air guide plate 6 by the valve stem seal 627. In the air guide slide 617 And a bypass valve stem 624 is fixedly connected to the bypass valve hand wheel 623 by a retainer spring 625. A bypass cap 626 is provided at the outer end of the bypass valve hand wheel 623, A bypass press spring 622 is provided on the bypass stem 624, and a conventional ratchet pawl mechanism for positioning the lock is provided between the bypass valve stem 624 and the bypass valve hand wheel 623. The bypass valve 623 may drive the bypass valve stem 624 to move axially; the ratchet pawl mechanism may lock the bypass valve stem or bypass valve hand wheel 623 to a position.

The inner end of the air guide pipe 618 is fitted with an air supply lever 615, and the outer end of the rod of the gas supply lever 615 is bent to 90. As shown in Fig. , And from the tube through the air guide 618 pipe wall corresponding to the card hole to the outside of the wall. A locking hole 611 is provided with a waist-shaped hole into which the inner end of the air supply lever 615 is movably connected to the waist hole of the lock hook 611. As shown in Fig. The rear end of the locking hook is a hook portion, and the rear end of the locking hook is in the form of a "T" -shaped structure in which the rod link 612 is supported at the inner end of the waist hole and the other end of the rod spring 612 is supported In the T-shaped position of the locking hook 611, the rod spring 612 is a cylindrical compression spring which always presses the gas feed rod 615 toward the right end position of the waist hole. A gas supply tension spring 604 is provided between the rear end of the lock hook 611 and the left side position of the air supply valve body 601, and the air supply tension spring 604 forms a pull-out gasket 620 for the air supply pipe 618 through the air supply lever 615 trend. [0024] The gas supply lever 616 is supported on the air supply valve body 601 by means of a lever support 616, which is easy to assemble and maintain, and a larger lever ratio can be obtained to help reduce the respiratory resistance. The other end of the supply lever 613 opposite the hinge end is connected to the supply lever seat 610, and the air supply lever seat 610 is mounted on the diaphragm 605 through a diaphragm liner. The supply lever 613 is brought into close contact with the bent end of the air supply rod 615 at the position corresponding to the outer end of the gas supply lever 615. When exhaled, the diaphragm 5 is inflated outwardly and the supply lever 613 is lifted, and during the swing of the supply lever 613 about the hinge point, the supply lever 613 pushes the bent end of the gas feed rod 615, The airway 618 is applied to the supply gasket 620 to effect a seal; when suction is carried out, the diaphragm 605 is agitated downwardly and the pulley of the gas supply rod 613 is pushed down. At this time, under the action of the gas supply spring 604, 604 through the locking hook 611, the air supply rod 615 pulls the air guide pipe 618 away from the air supply gasket 620 so that a ventilation gap is generated between the nozzle of the air pipe 618 and the gas supply gasket 620, fresh air from the air supply pipe joint 628 The annular airway on the airway slide 617 enters the air guide tube 618 and feeds air into the face shield.

As shown in Fig. 3, a lock plate 630 is fixed to the air supply valve body 601, and the lock plate 630 is located below the diaphragm 605, and the lock hook 611 is located below the lock plate 630. As shown in Fig. The locking plate 630 is provided with a locking hole 629 which corresponds to the hook portion position of the locking hook 611 so that the hook portion of the locking hook 611 can be caught in the locking hole 629. The lock valve body 601 is also provided with a lock lever push rod 603 which is movable in the axial direction, and a lock hook stem return spring 602 is provided between the lock lever lever 603 and the air supply valve body 601. The front end of the hook push rod 603 is provided with a shoulder portion, and the rear end of the lock lever lever 603 is extended to the outside of the air supply valve body 601. When the latch push rod return spring 62 is pushed inwardly from the rear end of the lock hook lever 603, the shoulder portion of the lock lever lever 603 pushes the lower end of the "T" type portion of the lock hook 611, and the lock hook 611 And the hook portion of the lock hook 611 is hooked into the lock hole 629 of the lock plate 630. As a result, Since the axial position of the locking hook 611 is locked in the hooking hole 629, the nozzle of the air guide pipe 618 is in close contact with the air supply gasket 620, and the gas supply spring 604 can not pull the air guide pipe 618 away from the air supply gasket 620, The air supply lever 613 can not further press the air guide pipe 618 against the air supply gasket 620, and the air respirator supply valve can only be in a non-operating state. And the diaphragm 605 contacts the hook end of the locking hook 611 during the first drum when the suction valve is used for the first time, and the hook end of the locking hook is pressed against the locking hole 629, the locking hook 611 is decoupled , The supply valve to start a continuous normal work. When stopped, push the hook push rod 603 to hook the hook of the locking hook again into the locking hole 629.

[0026] The backplane assembly 2 of the positive pressure air respirator as shown in Fig. 4, which comprises a back plate body 201, which is formed by injection molding. Figure 4 in the front of the backplane assembly of the cylinder mounting surface, the reverse side of the human body in contact with the negative side. The upper portion of the back plate body 201 is curved in an arc shape corresponding to the shoulder position, and the lower portion of the back plate body 201 is bent inwardly in an arc shape corresponding to the waist position so that the longitudinal direction of the back plate body 201 is S- The plate body 201 is a generally narrow, wide structure, which is ergonomic design and is more comfortable to wear.

The back plate body 201 is provided with a symmetrical structure in which a back plate rib 211 is provided at a position of a symmetrical line of the back plate body 201, and an edge rib is also provided on the edge of the back plate body 201. As shown in Fig. A cylinder upper holder 209 is provided at the back position of the back plate ribs 211, and a cylinder lower support 214 is provided at the waist position of the back plate ribs 211. As shown in Fig. As shown in Fig. 5, the top surface of the cylinder lower support 214 is a circular arc surface, and the top surface of the upper holder 209 of the cylinder is also a circular arc surface whose radius is the same as the outer cylindrical surface of the cylinder So as to be in good contact with the cylinder. A handle hole 212 is provided on both sides of the back plate ribs 211 at the shoulder and waist contact portions of the back plate body 201, respectively. The handle hole 212 is a through hole, and the periphery of the through hole is provided with a hand hole flange The strength and rigidity of the back plate body 201 are enhanced, and the comfort of the hand grip is also enhanced.

As shown in Fig. 6, an anti-collision pad 216 is fixedly mounted on the lower end top position of the back plate body 201, and the collision pad 216 is made of a rubber having elasticity. A head valve support 215 is provided above the impact pad 216, which is provided with a bottle head valve holder 215 for mounting a compressed air bottle head valve and for making the head of the bottle The lowest point is still above the bottom end of the crash pad 216 to protect the bottle head from damage by impact.

[0029] The waist belt 203 is attached to both sides of the waist position of the back plate body 201. Both ends of the waist belt 203 extend toward both sides of the back plate body 201, and the buckles 213 that can be inserted into each other are provided at the belt ends of the waist belt 203. As shown in Fig. A waist cushion 204 is provided on the back surface of the waist panel 203 corresponding to the waist belt 203, and the waist pad 204 extends from one side of the waist belt to the waist of the other side, and both ends of the waist pad 204 pass through the waist The lumbar fastener tape 202 on the cushion 24 is attached and mounted on the waist belt 203. As shown in Fig.

The other end of the shoulder tape 208 is sewn to the extension of the corresponding side belt 203, and the shoulder tape 208 is attached to the upper end of the back plate body 201. As shown in Fig. The shoulder strap 208 has two, two shoulder strips 20S are located on both sides of the back plate body 201, and a shoulder pad 208 is provided on both shoulder straps 208, respectively. Both the waist pad 204 and the shoulder pad 207 are made of flame retardant cloth and flame retardant polypropylene.

On both sides of the shoulder position of the back plate body 201 are fastened to the cylinder fastener band 205, the two belt ends of the cylinder fixing band 205 extend toward both sides of the back plate body 201, respectively, and the cylinder One end of the fixing belt 205 is connected with a metal connecting ring 210, and the other end of the cylinder fixing belt 20f5 is connected with a claw clasp 206 to facilitate the fastening of the cylinder. The cylinder holder 209 is located on the connecting lines of the cylinders fastening belt 205 on both sides so that the position of the cylinder holder 299 corresponds to the position of the cylinder fastener 205.

[0032] The above description of the technical solution of the present invention is not limited thereto by way of example only, and modifications and equivalent substitutions by those skilled in the art are within the scope of the present invention.