JP2000161814A - Engine-driven heat pump type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly and rapidly perform the start of both a heating operation and a cooling operation by preventing the unnecessary pressure drop of a high- pressure refrigerant compressed by a compressor, and reliably and rapidly switching over a four-way valve when the operation of an air conditioner is started, irrespective of an initial state of the four-way valve. SOLUTION: An engine-driven heat pump type air conditioner 1 has a cooling liquid circulating cycle for cooling an engine 2 and a refrigerant circulating cycle in which a refrigerant as a heating medium for the heat pump type air conditioner circulates, and also has a waste heat recovery unit 9 which effects heat exchange between a cooling liquid circulating in the engine cooling cycle and the refrigerant circulating in a heat pump type heat exchange cycle. The waste heat recovery unit 9 is disposed at a portion between a four-way valve 14 and an accumulator 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which a compressor included in a heat exchange cycle is driven by an engine. The present invention relates to an engine-driven heat pump air conditioner having a four-way valve for switching according to the selection of operation.

[0002]

2. Description of the Related Art An engine-driven heat pump air conditioner disclosed in Japanese Patent Publication No. 8-20143 transmits waste heat of an engine coolant provided for improving a heating function to a refrigerant of the air conditioner. Such a waste heat recovery device is provided between the four-way valve and the outdoor heat exchanger. During the cooling operation, the high-pressure refrigerant compressed by the compressor flows through the waste heat recovery device immediately after leaving the four-way valve.

Further, in a general engine-driven heat pump air conditioner, a four-way valve for switching a refrigerant circulation path according to a selection between a cooling operation and a heating operation is provided.
As a method for switching the four-way valve, a method is performed using a pressure difference between the high-pressure refrigerant compressed by the compressor and the low-pressure refrigerant that has passed through the outdoor heat exchanger, the indoor heat exchanger, and the expansion valve. is there. In addition, the four-way valve is in a cooling mode or a heating mode in a state before starting.

[0004]

However, in the engine-driven heat pump air conditioner disclosed in Japanese Patent Publication No. Hei 8-20143, when a four-way valve set to the cooling mode at the time of starting is used, the compressor is not used. Immediately after the high-pressure refrigerant compressed by the four-way valve exits the four-way valve, the refrigerant flows through the waste heat recovery device in which the cooled engine coolant is accumulated, so that the refrigerant near the four-way valve discharge port is condensed by being cooled. It will be liquefied and the pressure will be extremely low especially at extremely low temperatures in winter. For this reason, the pressure in the space inside the four-way valve, which is to be brought into a high-pressure state when the high-pressure refrigerant flows from the compressor, is unlikely to increase, so that a pressure difference for switching the four-way valve cannot be obtained. As a result, switching from the cooling mode to the heating mode of the four-way valve is not performed smoothly, and when the switching is remarkable, the switching is stopped in an incomplete state, so that there is a problem that the heating operation cannot be started.

Accordingly, an object of the present invention is to provide an engine-driven heat pump air conditioner in which switching of a four-way valve at the time of starting the air conditioner is performed reliably and promptly.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an engine, a pump for circulating a coolant for cooling the engine, a radiator for radiating heat of the coolant to the outside air, and a bypass for bypassing the radiator. A coolant circulation cycle having at least a flow path and a switching means for flowing the coolant to a radiator side or a bypass passage side; a compressor driven by the engine to compress the refrigerant; a refrigerant discharge side and suction of the compressor Side, a four-way valve for switching the discharge / suction direction of the refrigerant compressed by the compressor, an outdoor heat exchanger connected to the four-way valve, and an indoor heat exchanger connected to the four-way valve, Expansion means provided between the outdoor heat exchanger and the indoor heat exchanger; and an expansion means provided between the suction side of the compressor and the four-way valve. And a waste heat recovery unit that exchanges heat between the coolant flowing through the bypass flow path and the refrigerant flowing through the refrigerant circulation cycle. The waste heat recovery device is disposed between the four-way valve and the accumulator. (Claim 1)

[0007] The waste heat recovery device is a double heat exchanger comprising a first heat exchanger disposed on the bypass flow path and a second heat exchanger disposed between the four-way valve and the accumulator. It may be a tube heat exchanger (claim 2).

With the above configuration, the high-pressure refrigerant compressed by the compressor once flows out of the four-way valve and flows in again, regardless of whether the four-way valve is initially set to the cooling mode or the heating mode. In the meantime,
Since the pressure does not drop suddenly because it does not flow through the waste heat recovery unit (double-tube heat exchanger) where the cold engine coolant has accumulated, the initial four-way valve Even when performing air conditioning operation that switches modes,
The switching of the four-way valve is performed smoothly, and a quick start of the cooling / heating operation is achieved. In particular, in winter, when the engine coolant is extremely cold, heating operation is often performed immediately after the engine is started. At this time, even if the four-way valve used is of the cooling mode specification in the initial state, this four-way valve The switching from the cooling mode to the heating mode is reliably and quickly performed, so that the heating operation can be smoothly and quickly started.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

An engine driven heat pump air conditioner 1 shown in FIGS. 1 and 2 has a coolant circulation cycle 1A in which a coolant for cooling an engine 2 circulates, and a refrigerant as a heat medium used in the air conditioner. And a refrigerant circulation cycle 1B for circulating.

The coolant circulation cycle 1A includes an engine 2 driven by gasoline, kerosene, light oil, or the like, a coolant passage 3 for circulating a coolant for cooling the engine 2, and A radiator 4 for releasing waste heat absorbed from the outside air by heat exchange with the outside air, a pump 5 for circulating a coolant in the coolant channel 3, and a coolant passage according to the use condition of the air conditioner. A first valve 6, a second valve 7, and a third valve 8 to be changed;
In the coolant flow path 3, one heat exchanger (first heat exchanger 9a) of a double-tube heat exchanger 9 as a waste heat recovery device arranged in parallel with the radiator 4 is provided. ing.

The coolant flow path 3 connects a first flow path 3a from a coolant discharge side of the engine 2 to a branch point 18b, and connects the coolant flow path 3 from the branch point 18b to a coolant suction side of the engine 2. The second flow path 3b in which the second valve 7, the radiator 4, and the pump 5 are arranged in the direction of circulation of the coolant, and the second flow path from the branch point 18b so as to bypass the radiator 4. It connects to a junction 18c located downstream of the radiator 4 on the road, and bypasses the radiator 4 where the third valve 8 and the first heat exchanger 9a are arranged in the direction of circulation of the coolant. A third flow path 3c as a bypass flow path, and a downstream side of the radiator 4 of the second flow path 3b from a branch point 18a of the first flow path 3a upstream of the branch point 18b and the pump. 5 upstream With linking to the point 18 d, composed of a fourth channel 3d of the first valve 6 is disposed.

The refrigerant circulation cycle 1B includes a refrigerant passage 12 for circulating the refrigerant and a compressor driven by the engine 2 through a clutch 10 to compress the refrigerant and circulate the refrigerant. 11, a four-way valve 1 for switching the direction of circulation of the refrigerant according to an operation mode
4, an outdoor heat exchanger 15 that performs heat exchange between the refrigerant and outdoor air, an indoor heat exchanger 17 that performs heat exchange between the refrigerant and indoor air, and the outdoor heat exchange An expansion valve 16 that is provided between the heat exchanger 15 and the indoor heat exchanger 17 and expands the refrigerant; and an accumulator 13 that performs gas-liquid separation of the refrigerant. Another heat exchanger (second heat exchanger 9b) of the double tube heat exchanger 9 is provided.

The refrigerant passage 12 is provided with the compressor 1
A first refrigerant passage 12a connecting the high-pressure refrigerant discharge side of the first refrigerant to the four-way valve 14; the four-way valve 14 and the outdoor heat exchanger 15;
A third refrigerant passage 12c connecting the outdoor heat exchanger 15 and the indoor heat exchanger 17 with the expansion valve 16 interposed therebetween, and a second refrigerant passage 12b connecting the outdoor heat exchanger 15 and the indoor heat exchanger 17 with the expansion valve 16 interposed therebetween. Refrigerant passage 12d connecting the four-way valve 17 and the four-way valve 14
And the fifth heat exchanger 9b in which the four-way valve 14 and the refrigerant inflow side of the compressor 11 are connected and the second heat exchanger 9b and the accumulator 13 are arranged in the refrigerant flow direction.
And a refrigerant passage 12e.

As described above, the double tube heat exchanger 9 includes the first heat exchanger 9a and the second heat exchanger 9b.
The first heat exchanger 9a is disposed on the third flow path 3c of the cooling liquid flow path 3, and the second heat exchanger 9b is connected to the fifth flow path of the refrigerant flow path 12. The cooling liquid circulating in the cooling liquid flow path 3 and the refrigerant circulating in the cooling liquid flow path 12 are arranged on the refrigerant path 12e so as to perform heat exchange. Liquid waste heat can be transmitted to the refrigerant. Therefore, during the heating operation, the heating function can be improved by transmitting the waste heat of the coolant to the refrigerant.

During the cooling operation of the engine driven heat pump air conditioner 1 according to this embodiment shown in FIG. 1, the first valve 6 of the cooling liquid circulation cycle 1A is operated.
By closing the third valve 8 and opening the second valve 7, the coolant that has absorbed the heat of the engine 2 flows from the first liquid passage 3a to the second liquid passage 3b.
This cooling liquid is caused to flow to the radiator 4.
As a result, the cooling liquid is cooled by the air passing through the radiator 4, and substantially releases the waste heat generated by the engine 2 from the radiator 4.

At this time, since the coolant is not circulated to the double tube heat exchanger 9, the refrigerant circulation cycle 1
No heat is transmitted to the refrigerant circulating in the B refrigerant passage 12, and the cooling function of the air conditioner is not impaired.

In the refrigerant circulation cycle 1B, high-pressure refrigerant compressed by the compressor 11 flows into the four-way valve 14 from the first refrigerant passage 12a. At this time, since the four-way valve 14 is connected as shown by a solid line in the figure, the high-pressure refrigerant flows into the outdoor heat exchanger 15 which flows through the second refrigerant path 12b and serves as a condenser, Here, the heat generated by the compression by the compressor 11 is liquefied while releasing the heat to the outside of the room, and after being expanded by the expansion valve 16 disposed in the third refrigerant passage 12c, the indoor side heat serving as an evaporator is obtained. It flows into the exchanger 17 and absorbs the heat of the indoor air while evaporating. Then, the low-pressure refrigerant that has passed through the outdoor-side heat exchanger 15, the expansion valve 16, the indoor-side heat exchanger 17, and the third refrigerant path 12c passes through the fourth refrigerant path 12d, and then returns to the four-way valve 14.
Into the fifth refrigerant passage 12e, pass through the second heat exchanger 9a of the double-tube heat exchanger 9 through which the engine coolant is not circulated, and then gas-liquid in the accumulator 13 Is separated, and then flows into the compressor 11 again.

On the other hand, in the engine driven heat pump type air conditioner 1 during the heating operation shown in FIG. 2, the first valve 6 and the second valve 7 of the cooling liquid circulation cycle 1A.
Is closed and the third valve 8 is opened, so that the coolant flows from the first liquid passage 3a to the third liquid passage 3
c to allow the coolant to bypass the radiator 4 and flow to the double-pipe heat exchanger 9. Thereby, the waste heat energy of the cooling liquid is transmitted to the refrigerant circulating in the refrigerant flow channel 12 of the refrigerant circulation cycle 1B, so that the heating function of the air conditioner is improved.

When the engine 2 needs to be quickly warmed, such as immediately after startup, the first valve 6 is opened and the second valve 7 and the third valve 8 are closed, so that the cooling is performed. The liquid may flow from the first liquid path 3a to the fourth liquid path 3d, and the cooling liquid may not flow through the radiator 4 nor the double pipe heat exchanger 9 (this circulation path may be used). Is not shown).

The selection of the flow direction of the coolant by the first, second and third valves 6, 7, 8 is not limited to the above-described method, and the coolant is supplied to the radiator 4 by the radiator 4.
Various controls are possible, for example, by allowing the gas to flow through both the heat exchanger 9 and the double tube heat exchanger 9 at the same time.

In the refrigerant circulation cycle 1B during the heating operation shown in FIG. 2, the four-way valve 14 is connected as shown by a solid line in the figure, and the high-pressure refrigerant compressed by the compressor 11 is supplied to the chamber serving as a condenser. The heat is circulated to the inside heat exchanger 17 and liquefied while releasing heat to the room air. After being expanded by the expansion valve 16, the heat flows into the outside heat exchanger 15 serving as an evaporator. Vaporizes while absorbing the heat of Then, the low-pressure refrigerant that has passed through the indoor-side heat exchanger 17, the expansion valve 16, the outdoor-side heat exchanger 15, and the third refrigerant path 12c enters the four-way valve 14 again through the second refrigerant path 12b. After flowing into the double-pipe heat exchanger 9 installed in the fifth refrigerant passage 12e and being heated by the engine coolant, gas-liquid separation is performed in the accumulator 13 and flows into the compressor 11 again. .

As shown in FIGS. 3, 4 and 5, the four-way valve 14 has a casing 21, in which a switching piston 22 is disposed. The switching piston 22 includes a main valve 23 formed in a substantially arcuate cross section, and a holding plate 26 fixedly holding the main valve 23 and having through holes 27a and 27b formed therein.
And pressure receiving members 24 formed on both ends of the holding plate 26 and slid along the inner wall of the casing 21 by being in pressure contact with the inner wall of the casing 21 due to a pressure difference between the inside and the outside.
a, 24b, and the pressure receiving member 24
Micro holes 25a, 25b and seal members 24c, 24c are formed in a and 24b, respectively.

With the above structure, the space A located inside the pressure receiving members 24a and 24b and outside the main valve 23 and the outside of the pressure receiving members 24a and 24b are provided inside the casing 21 of the four-way valve 14. Are defined, and a space D located inside the main valve 23 is defined.

The casing 21 is connected to the space A and the high-pressure refrigerant discharge port of the compressor 11 through the first refrigerant passage 12a, and a high-pressure refrigerant inflow tube for guiding the high-pressure refrigerant to the space A. 35, in the fifth refrigerant path 12e, the space D and the double pipe heat exchanger 9
Low-pressure refrigerant outflow tube 3 through which the low-pressure refrigerant flows toward the compressor 11.
7 and the second refrigerant passage 12b, the outdoor heat exchanger connecting tube 3 connecting the outdoor heat exchanger 15 and the space A or the space D depending on the operation mode of the air conditioner.
6 and the fourth refrigerant path 12d, the indoor heat exchanger connecting tube 3 connecting the indoor heat exchanger 17 and the space A or the space D depending on the operation mode of the air conditioner.
8 are provided.

Further, inside the casing 21, the outdoor heat exchanger connecting tube 36, the low-pressure refrigerant outflow tube 37, and the indoor heat exchanger connecting tube 3 are provided.
A valve seat 28 is provided to hold one end of each of the valve seats 8 so as to communicate with the inside of the casing 21.
The flange 23a formed on the slide 3 is slidable. Further, through holes 31 communicating with the spaces B1 and B2 are provided at both ends of the casing 21, respectively.
End caps 30a and 30b having a and 31b are provided.

The switching piston 22 has two positions, a cooling mode and a heating mode.
In the cooling mode, the high-pressure refrigerant inflow tube 35 communicates with the outdoor heat exchanger connecting tube 36 via the through hole 27b, and the indoor heat exchanger connecting tube 38
And the low-pressure refrigerant outflow tube 37 (see FIG. 4).
On the other hand, in the heating mode, the high-pressure refrigerant inflow tube 35 and the indoor heat exchanger connection tube 38 are connected.
Are communicated through the through hole 27a, and the outdoor heat exchanger connecting tube 36 and the low-pressure refrigerant outflow tube 37 are communicated (see FIG. 5B).

The switching pilot 40 includes a pilot body 41 and a first needle 44 disposed in a needle insertion portion 50 formed inside the pilot body 41.
And a second needle 45, a first spring 46 for urging the first needle 44 toward the second needle 45, and urging the second needle 45 toward the first needle 44. A second spring 48, a plunger 42 formed of a magnetic material and holding the second needle 45, an electromagnetic coil 43 disposed around the plunger 42, and a switching device communicating with the space B1. A first tube 55, a second switching tube 56 communicating with the space B2, and a third switching tube 57 communicating with the space C inside the low-pressure refrigerant flow tube 37 are configured.

The first needle 44 and the second needle 45 have large diameter portions 44a, 45a and large diameter portions 44a.
needle portions 44b, 4 formed thinner than a, 45a
5b, and inclined portions 44c, 4 formed from the large diameter portions 44a, 45a toward the needle portions 44b, 45b.
5c. The large diameter portion 44a of the first needle 44 is inserted into the first space 50a of the needle insertion portion 50, and the large diameter portion 45a of the second needle 45 is inserted.
Is slidably stored in the second space 50b, and the two needle portions 44 of the two needles 44, 45
b and 45b are stored in the third space 50c.
The tips of the needle portions 44b and 45b are in contact with each other.

The first spring 46 is connected to an end cap 4 provided at one end of the pilot body 41.
7 and the large diameter portion 44a of the first needle 44, and the second spring 48 is provided so as to urge the plunger 42 toward the first needle 44. . Further, in the present embodiment, the second spring 4 is more than the first spring 46.
8 has a stronger biasing force.

When energized, the electromagnetic coil 43 moves the plunger 42 in a direction opposite to the first needle 44 (rightward in the drawing) against the urging force of the second spring 48. Let it.

The first switching tube 55 is provided with a communication hole 31 formed in the end cap 30a of the four-way valve 14 on the indoor heat exchanger connecting tube 38 side (the left side in the figure).
a and the first space 5 of the needle insertion portion 50
0a, and the switching second
The tube 56 is connected to the end cap 30 on the outdoor heat exchanger connecting tube 36 side (the right side in the figure) of the four-way valve 14.
b and the needle insertion portion 5
The third switching tube 57 connects the space C inside the low-pressure refrigerant outflow tube 37 with the third space 50c of the needle insertion portion 50. It is provided to communicate.

As described above, in this embodiment, since the second spring 48 has a stronger urging force than the first spring 46, the electromagnetic coil 43 is not energized. In some cases, as shown in FIG. 4A, the inclined portion 45c of the second needle 45 is in pressure contact with a second valve seat 41b formed on the pilot body 41. That is, the four-way valve 14 is in the cooling mode when the air conditioner is started.

In the cooling mode shown in FIGS. 4A and 4B, the high-pressure refrigerant compressed by the compressor 11 is supplied from the high-pressure refrigerant inflow tube 35 to the four-way valve 14.
It enters the internal space A and receives the pressure receiving members 24a, 24b.
Flows out into the spaces B1 and B2 on both sides of the switching piston 22 from the minute holes 25a and 25b formed at the same time, since the second needle 45 of the switching pilot 40 closes the needle insertion portion 50 at this time. , The space B2
The high-pressure refrigerant flowing out of the micro holes 25b on the side
At the same time that the space B2 becomes high pressure, and at the same time, the first switching tube 55 and the third switching tube 57 communicate with each other through the needle insertion portion 50. Is the first switching tube 5
5. Needle insertion part 50, and third tube 57 for switching
, Flows into the space C inside the low-pressure refrigerant outflow tube 37 through which the low-pressure refrigerant flows, and the space B1 has a low pressure, so that the switching piston 22 is pushed to the left in the figure and simultaneously attracted to the left in the figure. The switching piston 22
Moves instantaneously to the left side in the figure, and the seal member 24c seals the opening of the end cap 30a on the left side in the figure. Thus, the four-way valve 14 is connected to the main valve 2
3, the indoor side heat exchanger connecting tube 38 and the low-pressure refrigerant flowing tube 37 are in communication with each other via the space D, and are connected as shown by a solid line in FIG.

Accordingly, the high-pressure refrigerant that has flowed into the space A flows out of the through-hole 27b formed in the holding plate 26 through the outdoor-side heat exchanger connecting tube 36 toward the outdoor-side heat exchanger 15. , The outdoor heat exchanger 1
5, the refrigerant which has been reduced in pressure via the expansion valve 16 and the indoor heat exchanger 17 is connected to the indoor heat exchanger connecting tube 3.
8, flows into the four-way valve 14, flows through the space D to the low-pressure refrigerant outflow tube 37, and flows out toward the compressor 11. Thereby, the refrigerant circulates in the flow direction during the cooling operation.

In the heating mode (see FIG. 5A), the electromagnetic coil 43 of the switching pilot 40 is energized. As a result, the plunger 42 is attracted to the right side in the drawing, and the inclined portion 44c of the first needle 44 is combined with the urging force of the first spring 46 to form the first valve seat formed inside the pilot body 41. 41a
Press against Accordingly, the switching second tube 56 and the switching third tube 57 communicate with each other, and the switching first
It is in a state of not communicating with the tube 55.

Thus, the high-pressure refrigerant compressed by the compressor 11 is supplied to the high-pressure refrigerant inflow tube 35.
Through the space A inside the four-way valve 14 and flows out of the small holes 25a and 25b formed in the pressure receiving members 24a and 24b into the spaces B1 and B2 on both outer sides of the switching piston 22. At this time, the switching pilot 40 Since the first needle 44 closes the needle insertion portion 50, the high-pressure refrigerant flowing out of the minute holes 25a on the space B1 side accumulates in the space B1 and the space B1 becomes high pressure, and at the same time, the switching 2 tubes 56 and the third for switching
Since the tube 57 communicates with the tube through the needle insertion portion 50, the high-pressure refrigerant in the space B2 passes through the second switching tube 56, the needle insertion portion 50, and the third switching tube 57, and is supplied with a low-pressure refrigerant. The refrigerant flows into the space C inside the low-pressure refrigerant outflow tube 37 through which the refrigerant flows, and this space B
2, the switching piston 22 is pushed to the right side in the figure, and is simultaneously attracted to the right side in the figure, so that the switching piston 22 instantaneously moves to the right side in the figure, and the sealing member 24c is moved to the right side in the figure. The opening of the end cap 30b is sealed. Thus, the four-way valve 14 is connected to the outdoor heat exchanger connecting tube 3 by the main valve 23.
6 and the low-pressure refrigerant flow tube 37 are in communication with each other via the space D, and are connected as shown by a solid line in FIG.

Accordingly, the high-pressure refrigerant flowing into the space A flows out from the through hole 27a formed in the holding plate 26 through the indoor heat exchanger connecting tube 38 toward the indoor heat exchanger 17. , The indoor heat exchanger 1
7, the low pressure refrigerant via the expansion valve 16 and the outdoor heat exchanger 15 is connected to the outdoor heat exchanger connecting tube 3.
6, flows into the four-way valve 14, passes through the space D, flows to the low-pressure refrigerant outflow tube 37, and flows out to the compressor 11. Thereby, the four-way valve 14 is connected as shown by a solid line in FIG. 2, and the refrigerant circulates in the flow direction during the heating operation.

As described above, the four-way valve 14 is connected to the high-pressure refrigerant compressed by the compressor 11, the outdoor heat exchanger 15, the expansion valve 16, and the indoor heat exchanger 17.
Is used to switch between the heating mode and the cooling mode by using the pressure difference with the low-pressure refrigerant that has passed through the air conditioner, so that the switching piston 22 can be switched from the cooling mode to the heating mode or from the heating mode to the cooling mode. In this case, the space A must be in a high pressure state.

Therefore, in the present invention, the double-tube heat exchanger 9 is connected to the four-way valve 14 and the accumulator 1.
3, the high-pressure refrigerant compressed by the compressor 11 does not suddenly lose its pressure immediately after flowing out of the four-way valve 14, so that the four-way valve 14e Is reliably and quickly obtained, and the switching of the switching piston 22 of the four-way valve 14 is performed smoothly and quickly.

[0041]

According to the present invention, since the high-pressure refrigerant compressed by the compressor does not unnecessarily lose the pressure after leaving the four-way valve, the switching of the four-way valve is surely performed particularly at the initial stage of startup. Will be Therefore, since the start of cooling and heating can be performed smoothly and promptly, stable air conditioning control can be obtained. In addition, since the double-tube heat exchanger is used as the waste heat recovery device, a small and efficient heat exchange can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circulation path of a coolant and a refrigerant during a cooling operation of an engine-driven heat pump air conditioner according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a circulation path of a coolant and a refrigerant during a heating operation of the engine-driven heat pump air conditioner according to the embodiment of the present invention.

FIG. 3 is a sectional view of a four-way valve and a switching pilot of the engine-driven heat pump air conditioner according to the embodiment of the present invention.

FIG. 4A is a cross-sectional view of a switching pilot during a cooling operation of the engine-driven heat pump air conditioner according to the embodiment of the present invention. FIG. 4 (b)
1 is a sectional view of a four-way valve during a cooling operation of an engine-driven heat pump air conditioner according to an embodiment of the present invention.

FIG. 5A is a cross-sectional view of a switching pilot during a heating operation of the engine-driven heat pump air conditioner according to the embodiment of the present invention. FIG. 5 (b)
1 is a cross-sectional view of a four-way valve during a heating operation of an engine-driven heat pump air conditioner according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 engine driven heat pump air conditioner 2 engine 3 coolant flow path 4 radiator 5 pump 6 first valve 7 second valve 8 third valve 9 double pipe heat exchanger 11 compressor 12 refrigerant flow path 13 accumulator 14 Four-way valve 15 Outdoor heat exchanger 16 Expansion valve 17 Indoor heat exchanger 22 Switching piston 23 Main valve 25a, 25b Micro hole 35 High-pressure refrigerant inflow tube 36 Outdoor heat exchanger connecting tube 37 Low-pressure refrigerant outflow tube 38 Indoor heat Exchanger connecting tube 40 Switching pilot 41 Pilot body 42 Plunger 43 Electromagnetic coil 44 First needle 45 Second needle 46 First spring 48 Second spring 50 Needle insertion part 55 First switching tube 56 Second switching Tube 57 Third tube for switching

Claims (2)

[Claims] 1. An engine, a pump for circulating a coolant for cooling the engine, a radiator for radiating heat of the coolant to the outside air, a bypass flow path for bypassing the radiator, and a radiator side for the coolant. Or a coolant circulation cycle having at least switching means for flowing to the bypass flow path side; a compressor driven by the engine to compress the refrigerant; a refrigerant discharge side and a suction side of the compressor connected to each other, and compressed by the compressor. A four-way valve for switching the refrigerant discharge / suction direction, an outdoor heat exchanger connected to the four-way valve, an indoor heat exchanger connected to the four-way valve, the outdoor heat exchanger, and the indoor side Expansion means provided between the heat exchanger and an accumulator provided between the suction side of the compressor and the four-way valve. An engine-driven heat pump air conditioner comprising: a refrigerant circulation cycle having: a waste heat recovery unit that performs heat exchange between a coolant flowing through the bypass flow passage and a refrigerant flowing through the refrigerant circulation cycle. An air conditioner is provided between the four-way valve and the accumulator. 2. The waste heat recovery device includes a first heat exchanger disposed on the bypass flow path and a second heat exchanger disposed between the four-way valve and the accumulator. The engine driven heat pump air conditioner according to claim 1, wherein the air conditioner is a double tube heat exchanger.