Engine heat pump type air conditioner

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to an air conditioner used as a heating / cooling hot water supply system for home and commercial use. More specifically, the heat of the lubricating oil of an engine is recovered in a refrigerant circuit to prevent deterioration due to a temperature rise of the lubricating oil and at the same time. It relates to an engine heat pump type air conditioner that has been improved so that heat can be used for subsidizing heating and the like.

【0002】

[Conventional technology]

In recent years, we have seen the spread of heat pump type heating and cooling hot water supply systems that use the engine as the drive source for the refrigerant compressor, and at the same time, recover the heat generated by the engine cooling water and exhaust gas heat that had been exhausted until then. , Technology to subsidize this for heating etc. has also been developed. Further, as seen in the engine used in this type of system and the engine for general automobiles, the lubricating oil storage portion called an oil tank or an oil pan is integrated with the crankcase or is internally stored.

【0003】

By the way, in a season when the outside air is hot like summer, the outside air temperature is added to the heat generated by the engine and the temperature becomes considerably high, which may cause deterioration of the lubricating oil. Conventionally, as one of means for preventing deterioration of lubricating oil, an oil tank is provided separately from the main body of the engine, that is, a separate type is known.

【0004】

On the other hand, as a cooling means for lubricating oil, there is a conventional method in which an oil cooler is installed in an engine, which is widely known.

【0005】

[Problems to be Solved by the Invention]

By the way, in the former case of the separate engine type oil tank, in order to prevent the temperature of the stored lubricating oil from rising, some structural consideration is given to dissipate heat from the oil tank itself. However, in such a heat dissipation structure, heat dissipation is performed only on the surface of the tank, and a sufficient heat dissipation effect cannot be expected, and prevention of oil deterioration cannot be expected so much. We have responded by increasing the capacity of the oil tank in anticipation of the momentum and heat dissipation effect, but this has led to an increase in the size of the engine, which has had a considerable effect on the layout of the entire system.

【0006】

Therefore, an object of the present invention is to provide an engine heat pump type air conditioner in which the size of the oil tank is suppressed, the temperature rise and deterioration of the lubricating oil are prevented, and the heat recovered from the lubricating oil can be used for the refrigerant circuit. To provide.

【0007】

[Means for solving problems]

In order to achieve this object, in claim 1, the engine heat pump type air conditioner according to the present invention has an engine cooling water circuit system including a cooling water pipe and an oil tank for storing lubricating oil separately provided outside the engine. In a heat pump type air conditioner that has a refrigerant circuit system including a refrigerant pipe and operates the refrigerant circuit system by an engine to perform air conditioning such as heating and cooling, the cooling water pipe and the refrigerant pipe are installed in the oil tank to absorb the heat of the lubricating oil. It has a structure that makes it possible to conduct electricity.

【0008】

In claims 2 and 3, the cooling water pipe and the refrigerant pipe conducting in the oil tank according to claim 1 can be configured as follows.

【0009】

In the case of a cooling water pipe, a bypass pipe is provided in the cooling water pipe so that the pipeline can be switched by branching from the outlet side of the radiator, and the bypass pipe is formed into a shape capable of absorbing heat from the lubricating oil in the oil tank to conduct conduction.

【0010】

Further, in the case of a refrigerant pipe, a bypass refrigerant pipe is provided so that the conduit can be switched by branching from the refrigerant pipe connecting the four-way valve of the refrigerant circuit system and the outdoor heat exchanger, and the bypass refrigerant pipe is installed in the oil tank. It is molded into a shape that can absorb heat from the lubricating oil and made conductive.

【0011】

[Action]

According to claim 1, the cooling water pipe and the refrigerant pipe are electrically conducted in the oil tank in which the lubricating oil is stored so that heat can be exchanged between the cooling water pipe and the refrigerant pipe. Remove heat from and recover. Unlike the conventional structure, the capacity of the oil tank does not need to be increased in order to cool the lubricating oil by the heat radiation of the oil tank itself.

【0012】

In the cases of claims 2 and 3, bypass pipes are provided in the cooling water pipe and the refrigerant pipe, respectively, and the bypass pipes are connected to the oil tank to recover the heat of the lubricating oil during winter heating and cool the lubricating oil during summer cooling. It is done by switching.

【0013】

[Example]

Hereinafter, examples of the engine heat pump type air conditioner according to the present invention will be described with reference to the drawings.

【0014】

FIG. 1 shows an air conditioner of an embodiment using an engine cooling water circuit system, a lubricating oil circuit system, and a heat pump type refrigerant circuit system connected thereto.

【0015】

The engine 1 performs the mechanical work of the compressor of the refrigerant circuit, and the outdoor unit including the engine cooling water circuit system and the lubricating oil circuit system, and the indoor unit such as the cooling / heating equipment (and hot water supply equipment) that blows cold air / warm air into the room. A heating and cooling circuit is formed between them.

【0016】

The configuration of the cooling water circuit system and the lubricating oil circuit system of the engine 1 that operates the refrigerant compressor of the refrigerant circuit is such that the exhaust gas heat exchanger 3 is connected to the return pipe 2A of the cooling water pipe 2 derived from the engine 1. In, heat exchange is performed between the cooling water and the exhaust gas (exhaust system such as an exhaust muffler is not shown). The return pipe 2A of the cooling water pipe 2 that exits the exhaust gas heat exchanger 3 is formed into a fin-shaped or spiral-shaped coil portion 2a inside the double pipe heat exchanger 5 via the electromagnetic first on-off valve 4. It is introduced in the form of. Upon exiting the double pipe heat exchanger 5, the cooling water pipe 2 becomes an outgoing pipe 2B heading for the engine 1, and is introduced into the engine 1 via the water circulation pump 6 to form a cooling water circulation circuit.

【0017】

Here, the first bypass water pipe 2C (bypass pipe) is branched from the return pipe 2A of the cooling water pipe 2 that exited the exhaust gas heat exchanger 3 to the inlet side of the first on-off valve 4. 1 Bypass water pipe 2C is provided with an electromagnetic second on-off valve 7 and is connected to the radiator 8. As is well known, the radiator 8 is a device that releases the heat of the cooling water to the atmosphere to cool it as a radiator and exchanges heat between the cooling water and the air. The first bypass water pipe 2C that exits the radiator 8 joins the above-mentioned outbound pipe 2B via an electromagnetic three-way valve 9, and is introduced into the engine 1 again via the water circulation pump 6.

【0018】

Further, the first bypass water pipe 2C exiting the radiator 8 branches into another second bypass water pipe (bypass pipe) 2D via the three-way valve 9, and this second bypass water pipe 2D is shown in the perspective view of FIG. It is introduced in the oil tank 10 which is a main part of the present invention. In a general example such as a conventional automobile engine, an oil tank is usually provided integrally with the crankcase, but in the case of the present invention, the oil tank 10 is separately installed outside the engine 1. It has a structure that has been set.

【0019】

Inside the oil tank 10, the second bypass water pipe 2D of the cooling water pipe 2 is introduced in the form of being formed in the finned tube 2d and immersed in the lubricating oil as shown in the figure, and is turned to the downstream side of the three-way valve 9. It joins the 1st bypass water pipe 2C again. By forming the conductive part of the second bypass water pipe 2D to the oil tank 10 into the shape of the finned tube 2d, heat exchange of the cooling water with the stored lubricating oil is efficiently performed, and the engine 1 is operated. It is possible to cool the lubricating oil by circulating and returning to take heat from the heated lubricating oil and let the cooling water absorb the heat. The oil tank 10 supplies lubricating oil to the engine 1 by the reciprocating pipes 11 and 12 of the oil pipe.

【0020】

On the other hand, the heat pump type refrigerant circuit has a refrigerant compressor 20 operated by the engine 1, and the pressurized refrigerant is circulated to the following devices through the refrigerant pipe 21. That is, the accumulator 22, the four-way valve 23, the indoor heat exchanger 24, the filter 25, the dryer 26, the expansion valve 27, the outdoor heat exchanger 28, and the like are connected from the refrigerant compressor 20. The order of the refrigerant flowing through each of these devices during summer cooling or winter heating is reversed by the switching operation of the four-way valve 23 by the solenoid valve. As is well known, the indoor heat exchanger 24 is an indoor installation device that operates as a condenser to blow hot air into the room during winter heating and operates as an evaporator to blow cold air into the room during summer cooling.

【0021】

In such a basic refrigerant circuit, the refrigerant pipe 21 between the four-way valve 23 and the outdoor heat exchanger 28 is provided with an electromagnetic third on-off valve 29, and the refrigerant pipe 21 coming out of the third on-off valve 29. Is formed as a fin or a coil portion 21a and introduced into the above-mentioned double pipe heat exchanger 9, and can exchange heat back to back with the coil portion 2b of the cooling water pipe 2. The coil portion 21a of the refrigerant pipe 21 exiting the double pipe heat exchanger 9 is connected to the outdoor heat exchanger 28.

【0022】

Similarly, in the refrigerant pipe 21, the refrigerant pipe 21 is branched from between the third on-off valve 29 and the double pipe heat exchanger 9, and a bypass refrigerant pipe 30 is provided. The bypass refrigerant pipe 30 is an electromagnetic type. The fourth on-off valve 31 of the above is provided. As shown in FIG. 2, the bypass refrigerant pipe 30 is formed in the finned tube 30a, is immersed in the lubricating oil in the oil tank 10, and is introduced next to the finned tube 2a of the second bypass water pipe 2D described above. .. That is, even in the portion branched from the refrigerant pipe 21 and conducted to the oil tank 10, by forming the shape of the finned tube 30a, heat exchange of the cooling water with the stored lubricating oil is efficient. Then, the engine 1 can be circulated and returned to take heat from the heated lubricating oil and absorb the heat in the refrigerant to cool the lubricating oil. A check valve 32 is provided in the bypass refrigerant pipe 30 that has exited the oil tank 10, and rejoins the refrigerant pipe 21 at the inlet side of the third on-off valve 29 described above.

【0023】

Furthermore, from the four-way valve 23 of the refrigerant circuit, the indoor heat exchanger 24 is followed by the filter 25, the dryer 26, and the expansion valve 27, which are continuously connected to the outdoor heat exchanger 28 described above. There is.

【0024】

Next, the operation of the embodiment device according to the above configuration will be described.

【0025】

When the device is started, the lubricating oil in the oil tank 10 circulates in the engine 1 in the oil reciprocating pipes 11 and 12. Further, the cooling water that has completed the cooling work in the engine 1 is introduced into the exhaust gas heat exchanger 3 from the return pipe 2A of the cooling water pipe 2, where heat exchange is performed with the exhaust gas discharged from the engine 1. It is said.

【0026】

During cooling during the summer season, the cooling water discharged from the exhaust gas heat exchanger 3 is controlled so that the first on-off valve 4 is closed, the second on-off valve 7 is opened, and the first bypass water pipe 2C is opened. Introduced to radiator 8 from the 1st bypass water pipe 2C. Further, in synchronization with this, the three-way valve 9 is switched and the cooling water cooled by the heat dissipation action while passing through the radiator 8 is introduced into the oil tank 10 via the second bypass water pipe 2D. In the oil tank 10, the lubricating oil that circulates in the engine 1 to raise the temperature and returns by the oil return pipe 11 undergoes heat exchange with the cooling water via the finned tube 2d of the second bypass water pipe 2D. Is cooled. That is, the cooling water absorbs the heat of the lubricating oil.

【0027】

During this time, in the refrigerant circuit, the refrigerant that has become high temperature and high pressure due to pressure compression by the refrigerant compressor 20 goes to the outdoor heat exchanger 28 by switching control of the four-way valve 23. That is, the refrigerant that has passed through the four-way valve 23 passes through the open third on-off valve 29, passes through the double-tube heat exchanger 5 without any action, and reaches the outdoor heat exchanger 28. By operating as a "condenser", the outdoor heat exchanger 28 is cooled and liquefied by contact with the outside air. The liquefied refrigerant liquid is depressurized by the expansion valve 27. The low-pressure liquid refrigerant liquid is then introduced into the indoor heat exchanger 24, which operates as an "evaporator" to remove heat from the indoor air and evaporate. The heat of vaporization at this time produces a cooling effect. The evaporated refrigerant gas returns to the refrigerant compressor 20 and repeats the same refrigeration cycle.

【0028】

On the other hand, during heating during the winter season, the cooling water from the exhaust gas heat exchanger 3 opens the first on-off valve 4, closes the second on-off valve 7, and closes the first bypass water pipe 2C. Then, it is introduced from the return pipe 2A to the double pipe heat exchanger 5. In synchronization with this, in the refrigerant circuit, the third on-off valve 29 is closed and the fourth on-off valve 31 is opened to open the bypass refrigerant pipe 30.

【0029】

That is, in the refrigerant circuit, the high-temperature and high-pressure refrigerant from the refrigerant compressor 20 is introduced into the indoor heat exchanger 24 by the switching operation of the four-way valve 23. The indoor heat exchanger 24 operates as a condenser, heat exchange is performed between the refrigerant and the indoor air, and warm air due to the heat of condensation is released to heat the room. The refrigerant is acted on by the dryer 26 and the filter 25 and is depressurized by the expansion valve 22. The decompressed refrigerant liquid is evaporated by taking heat from the outside air using the outdoor heat exchanger 28 as an evaporator. The evaporated refrigerant gas is introduced into the double tube heat exchanger 5. Here, heat exchange is performed with the cooling water flowing through the coil portion 2a branched from the cooling water pipe 2, and the refrigerant gas takes away the heat of the cooling water and recovers it.

【0030】

Since the third on-off valve 29 is closed and the fourth on-off valve 31 is opened to open the bypass refrigerant pipe 30, the refrigerant gas exiting the double pipe heat exchanger 5 enters the bypass refrigerant pipe 30 and enters the oil tank 10. Introduced in. Here, heat exchange is performed between the refrigerant gas passing through the bypass refrigerant pipe 30 and the lubricating oil in the oil tank 10, and the refrigerant gas also takes away the heat of the lubricating oil and recovers it. The refrigerant gas that has recovered the heat returns to the refrigerant pipe 21 and is returned to the refrigerant compressor 20, and the same heating cycle is repeated thereafter.

【0031】

[Effect of the invention]

As described above, in claim 1, the engine heat pump type air conditioner according to the present invention has a cooling water pipe and a refrigerant pipe in an oil tank in which lubricating oil is stored in an oil tank separately placed outside the engine. Is conducted so that heat can be exchanged with the lubricating oil, and heat is taken from the lubricating oil by the cooling water and the refrigerant to be recovered and cooled. Therefore, deterioration due to the temperature rise of the lubricating oil is prevented, as in the conventional structure. By cooling the lubricating oil by dissipating heat from the oil tank itself, there is an effect that the capacity of the oil tank does not increase.

【0032】

In the cases of claims 2 and 3, bypass pipes are provided in the cooling water pipe and the refrigerant pipe, respectively, and these are connected to the oil tank to switch the pipeline for heat recovery of the lubricating oil during winter heating and lubrication during summer cooling. Is performed efficiently, and in particular, during heating, the heat absorption from the lubricating oil can be recovered and effectively used.

[Simple explanation of drawings]

[Figure 1]

Circuit block diagram of the engine heat pump type air conditioner of the embodiment according to the present invention [Figure 2]

Perspective perspective view of the oil tank which is the main part of the present invention [Explanation of symbols]

1 ... engine, 2 ... cooling water pipe, 2C ... 1st bypass water pipe, 2D ... 2nd bypass water pipe, 2d ... 2nd bypass water pipe with fins, 4, 7, 29, 31 ... 1st to 4th on-off valves, 8 ... radiators, 9 ... three-way valves, 10 ... oil tanks, 11, 12 ... oil reciprocating pipes, 20 ... refrigerant compressors, 21 ... Cooling pipe, 23 ... Four-way valve, 24 ... Indoor heat exchanger, 27 ... Expansion valve, 28 ... Outdoor heat exchanger, 30 ... Bypass refrigerant pipe.