JP3248115B2 - Engine driven heat pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump device for circulating a refrigerant in a refrigerant circuit by a compressor driven by a water-cooled engine.

[0002]

2. Description of the Related Art Generally, in an engine-driven heat pump device, exhaust heat of an engine that drives a heat pump can be used as a heat source. Conventionally, exhaust heat in exhaust gas of an engine is exhausted by an exhaust gas heat exchanger. In the case where the engine is a water-cooled engine, the cooling water heated by the engine is circulated through the liquid-phase refrigerant by using a double-tube heat exchanger to collect the exhaust heat from the engine into the refrigerant. I have to.

The double-pipe heat exchanger has a double-pipe structure comprising an inner pipe and an outer pipe, in which hot water is circulated in the inner pipe, and a refrigerant is circulated between the inner pipe and the outer pipe. The inlet and outlet of the refrigerant to the double-pipe heat exchanger are generally formed only at both ends of the outer pipe. Therefore, in such a double-pipe heat exchanger, heat exchange with warm water is performed through the inner pipe while the refrigerant always flows over a certain distance.

[0004]

By the way, in the engine driven heat pump device, the exhaust heat of the engine and the exhaust heat of the refrigerant are distributed for a plurality of purposes, for example, for heating and hot water use, and the heat balance is reasonable. Need to be adjusted.

In consideration of such circumstances, in the conventional double tube heat exchanger, the amount of heat exchanged is adjusted only by the intermittent operation, so that the adjustment is rough. Therefore, in order to more accurately adjust the amount of exchanged heat, it is necessary to adjust other factors such as the rotation speed of the engine, which is extremely complicated.

The present invention has been made in view of such circumstances, and in an engine-driven heat pump device, the amount of heat exchanged between hot water in a hot water circuit and refrigerant in a refrigerant circuit is adjusted by a simple structure. It is intended to be performed relatively accurately.

[0007]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

The first aspect of the present invention provides a hot water circuit 5 that drives the compressor 2 with the water-cooled engine 3 to circulate the refrigerant in the refrigerant circuit 4 and circulates the hot water generated by cooling the engine 3. An engine-driven heat pump device having a double heat exchanger 12 having a pipe forming the refrigerant circuit 4 so as to cover the outside of a hot water pipe forming the hot water circuit 5; 5 is hot water
Heat exchanging portion 38a of the hot water storage tank 37 for use, the double-pipe heat exchanger 12, the engine 3 of the water jacket, an exhaust gas heat exchanger 31, in the order of the heat exchange portion 38a of the savings water tank 37,
A main hot water passage communicating therewith, an intermediate portion of the main hot water passage between the exhaust gas heat exchanger 31 and the heat exchange section 38a, the heat exchange section 38a and the double pipe heat exchanger 12; A hot water bypass passage 36 communicating with an intermediate portion of the hot water bypass passage, a hot water bypass passage opening / closing valve 35 provided in the middle of the hot water bypass passage, and the main hot water passage divided into two portions by communicating portions at both ends of the hot water bypass passage 36. And a cooling water pump 34 for circulating hot water in the above-mentioned order on the side opposite to the hot water storage tank, wherein the refrigerant circuit 4 is a first refrigerant that communicates between the discharge side of the compressor 2 and the indoor heat exchanger 18. A passage, a second refrigerant passage communicating the indoor heat exchanger 18 with the expansion valve 15,
A third refrigerant passage communicating the expansion valve 15 with the outdoor heat exchanger 14, a fourth refrigerant passage communicating the outdoor heat exchanger 14 with the suction side of the compressor 2, and a first refrigerant passage. A first intermediate portion P1 on the way, a fifth refrigerant passage communicating with one end of the double tube heat exchanger 12, a second end of the double tube heat exchanger 12, A sixth refrigerant passage communicating with a second intermediate portion P2 located in the middle of the two refrigerant passages, a third intermediate portion P3 located in the middle of the fourth refrigerant passage, and an intermediate portion P of the double pipe heat exchanger 12. preparative a seventh refrigerant passage communicating a fourth intermediate portion P4 to be midway between the third intermediate portion P3 and the suction side of the compressor 2 of the fourth refrigerant passage, the first
An eighth refrigerant passage communicating with a fifth intermediate portion P5 located in the middle of the fifth refrigerant passage, and the second intermediate portion P2 of the second refrigerant passage.
A first opening / closing valve 17 disposed on the way between the first heat exchanger 18 and the indoor heat exchanger 18, and the fifth intermediate portion which is a part of the fifth refrigerant passage.
A refrigerant passage between P5 and the first intermediate portion P1;
A second on-off valve 25 and a third on-off valve 2 respectively disposed in the middle of the refrigerant passage, the seventh refrigerant passage and the eighth refrigerant passage
4, the fourth on-off valve 13 and the fifth on-off valve 11 are arranged. When the hot water in the hot water storage tank 37 is not used while radiating heat in the indoor heat exchanger 18, the first on-off valve 17 is opened. The compressor 2, the first refrigerant passage, the indoor heat exchanger 18, the second refrigerant passage, the expansion valve 15, the third refrigerant passage, the outdoor heat exchanger 14, and the fourth refrigerant passage While circulating the refrigerant in order, the second on-off valve 25
And the third on-off valve 24 is closed , the fourth on-off valve 13 and the fifth on-off valve 11 are opened, the hot water bypass passage on-off valve 35 is opened, and the indoor heat exchanger 18 does not release heat. When using the hot water in the hot water storage tank 37, the first on-off valve 17 is closed and the second on-off valve 25 and the third on-off valve 24 are opened, while the fourth on-off valve 13 and the fifth on-off valve are opened. With the valve 11 closed, the compressor 2, the fifth refrigerant passage, the double pipe heat exchanger 12, the sixth refrigerant passage, the expansion valve 15, the third refrigerant passage, the outdoor heat exchanger 14, Circulating the refrigerant in the order of the fourth refrigerant passage,
An engine-driven heat pump device, wherein the hot water bypass passage opening / closing valve 35 is closed. ].

According to the first aspect of the present invention, when the hot water in the hot water storage tank 37 is not used while radiating heat in the indoor heat exchanger 18, the hot water bypass passage opening / closing valve 35 is opened. It is supplied to the double tube heat exchanger 12 well. On the other hand, in the refrigerant circuit 4, the refrigerant that has condensed and radiated heat in the indoor heat exchanger 18 passes through the expansion valve 15 to be reduced in pressure and temperature, and is absorbed and evaporated in the outdoor heat exchanger 14, and the refrigerant from the outdoor heat exchanger 14 Is circulated to a part of the double tube heat exchanger 12 and is heated by the exhaust heat of the engine,
Thus, the refrigerant recovers the engine exhaust heat and is used for heat radiation in the indoor heat exchanger 18.

When the hot water in the hot water storage tank 37 is used while the indoor heat exchanger 18 does not radiate heat, the refrigerant is condensed in the double tube heat exchanger 12 and radiates heat to the circulating cooling water. The radiated refrigerant passes through the expansion valve 15 to be reduced in pressure and temperature, and is evaporated and absorbed by the outdoor heat exchanger 14 to be gasified and sucked by the compressor. On the other hand, the refrigerant is not circulated to the indoor heat exchanger 18, so that the room is not heated. Cooling water is provided with both refrigerant condensation heat and engine exhaust heat.

As described above, the double-pipe heat exchanger 12 can meet the demand for indoor heating and the demand for hot water supply, and can transfer heat from the cooling water to the refrigerant and heat from the refrigerant to the hot water. ,
That is, the heat of condensation of the refrigerant and the exhaust heat of the engine can be efficiently distributed to the room or the hot water supply in accordance with the indoor heating requirement and the hot water utilization requirement.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an engine driven heat pump device according to the present invention will be described below with reference to the drawings. FIG.
1 is a schematic configuration diagram of an engine-driven heat pump device.

In FIG. 1, reference numeral 1 denotes an engine-driven heat pump device, 2 denotes a compressor, and 3 denotes a water-cooled engine for driving the compressor 2. The engine-driven heat pump device 1 has a refrigerant circuit 4 for compressing and circulating a refrigerant such as Freon by a compressor 2 and a hot water circuit 5 for circulating cooling water for the engine 3.

The refrigerant circuit 4 compresses and circulates the refrigerant,
It performs a heat pump function by vaporization and liquefaction, and has a base circuit 7 forming a circuit from the compressor 2 to the four-way valve 6 and a circulation circuit 8 connected to the four-way valve 6. That is, a pipe extending from the discharge port of the compressor 2 is connected to the first port 6 a of the four-way valve 6.
A pipe extending to the suction port of the compressor 2 is connected to b. Further, both ends of the circulation circuit 8 are connected between the third port 6c and the fourth port 6d of the four-way valve 6.

The circulation circuit 8 includes, in order from the third port 6c, a solenoid valve 11 constituting a fifth on-off valve, a double pipe heat exchanger 1
2. Electromagnetic valve 13 constituting fourth on-off valve, outdoor heat exchanger 1
4. A heating electronic expansion valve 15, a receiver tank 16, a cooling electronic expansion valve 17, and an indoor heat exchanger 18, which constitute the first on-off valve, are connected to the fourth port 6d.

The solenoid valve 11 constituting the fifth on-off valve is provided between one end of the double pipe heat exchanger 12 and a fourth intermediate portion P4 between the outdoor heat exchanger 14 and the four-way valve 6. Placed in the fourth
The solenoid valve 13 constituting the on-off valve is provided at an intermediate portion P between the first heat exchange portion 12a and the second heat exchange portion 12b of the double-pipe heat exchanger 12.
And a third intermediate portion P between the outdoor heat exchanger 14 and the four-way valve 6
3 and the receiver tank 16 is disposed at a second intermediate portion P2 between the heating electronic expansion valve 15 and the cooling electronic expansion valve 17 constituting the first on-off valve.

As will be described later, the double tube heat exchanger 12 of this embodiment includes a first heat exchange section 12a and a second heat exchange section 12b.
In the circulation circuit 8, the first heat exchange unit 12a is connected.

The circulation circuit 8 includes an electromagnetic valve 11
A bypass path 21 for bypassing between the valve and the solenoid valve 13;
A bypass path 22 that bypasses between the electromagnetic valve 13 and the heating electronic expansion valve 15 and a bypass path 23 that bypasses the four-way valve 6 and the electromagnetic valve 11 are arranged in parallel. The bypass passage 22 has a second heat exchange section 12b and a solenoid valve 24 as a third on-off valve.
And an electromagnetic valve 25 as a second on-off valve is installed in the bypass passage 23.

The bypass passage 22 communicates the other end of the double-pipe heat exchanger 12 with the second intermediate portion P 2 at the position of the receiver tank 16. The bypass path 23 is connected to the first intermediate portion P1.
And one end of the double-pipe heat exchanger 12.

The hot water circuit 5 of the engine driven heat pump device 1 having such a refrigerant circuit 4 is configured as follows. That is, the hot water circuit 5 is formed as a circulation circuit that communicates with the water jacket of the engine 3, and the exhaust gas heat exchanger 3 is sequentially arranged along the flow direction of the hot water.
1, a solenoid valve 32, a radiator 33, a cooling water pump 34, and a double pipe heat exchanger 12 are provided.

The hot water circuit 5 is provided with a hot water bypass passage 36 having a solenoid valve 35 serving as a hot water bypass passage opening / closing valve, bypassing the solenoid valve 32 and the radiator 33. The pipes are branched at each of the position and the position between the radiator 33 and the cooling water pump 34 to form a hot water circulation path 38 for circulating and supplying hot water to the heat exchange section 38a of the hot water storage tank 37. .

Therefore, the hot water of the hot water circuit 5 is guided to the heat exchange section 38a of the hot water storage tank 37 through the hot water circulation path 38, and the hot water supply tank 37 heats, for example, the water supplied from the tap water by the heat exchange section 38a. It can be used as. In this heat pump device 1, the solenoid valve 1
1, 13, 15, 17, 24, 25 and solenoid valves 32, 3
5 is for electrically connecting and disconnecting the pipeline, and the other constituent devices are a double-tube heat exchanger 12 described below.
It is a publicly known thing except for.

The structure of the double-pipe heat exchanger 12 used in the engine-driven heat pump apparatus 1 is, for example, shown in FIGS.
As shown in FIG. In these figures, 41 is an inner tube, 42 is an outer tube, and the double tube heat exchanger 12 is formed as a concentric double tube as shown in FIG.

In the vicinity of both ends of the outer tube 42, a first port 42a and a second port 42b communicating with a space 43 formed between the outer tube 42 and the inner tube 41 are formed. A third port 42c communicating with the space 43 is formed at a portion of the portion 42 between the first and second ports 42a and 42b.

In the double-pipe heat exchanger 12, hot water is circulated through the inner pipe 41 by the cooling water pump 34 to form a part of the hot water circuit 5. Also, the first port 42
a is connected to a conduit extending from the solenoid valve 11, and a third port 42c is connected to a conduit leading to the solenoid valve 13, so that the third port 42a is connected to the third port 4a.
The space 43 corresponding to 2c constitutes a part of the circulation circuit 8 as the first heat exchange unit 12a. The second port 42b is connected to the bypass passage 22 having the solenoid valve 24, and a space 43 between the third port 42c and the second port 42b constitutes the second heat exchange unit 12b. is there.

Such an engine-driven heat pump device 1
Can be cooled or heated by the indoor heat exchanger 18, and a hot water circulation operation for heating the hot water storage tank 37 can be performed.

The operation of the engine-driven heat pump device 1 will be described below with reference to FIGS. First, an operation state in the case where the hot water is supplied simultaneously with the cooling will be described with reference to FIG.

In this operating state, the solenoid valves 32 and 35 in the hot water circuit 5 are closed. Thus, the hot water circulating in the hot water circuit 5 is circulated to the hot water storage tank 37 via the hot water circulation path 38, and in this hot water storage tank 37, for example, the water supplied from the tap water is heated by the heat exchange unit, and can be used as hot water. .

In the circulation circuit 8 of the refrigerant circuit 4, the solenoid valve 13, the heating electronic expansion valve 15, and the solenoid valve 25
Is closed, and the other solenoid valves are opened, and the communication between the first port 6a and the third port 6c and the communication between the second port 6b and the fourth port 6d of the four-way valve 6 are performed. .

Thus, the refrigerant compressed by the compressor 2 passes from the third port 6c through the electromagnetic valve 11 and the first heat exchange section 12a of the circulation circuit 8, and then to the second heat exchange section 12b and the electromagnetic valve. After reaching the receiver tank 16 through the bypass passage 22 passing through 24 and passing through the cooling electronic expansion valve 17,
It reaches the indoor heat exchanger 18 and circulates through the circuit returning to the compressor 2 via the four-way valve 6.

Therefore, the heat recovered by the indoor heat exchanger 18 is exclusively discharged by the double-tube heat exchanger 12, and this heat is stored in the hot water storage tank 37 via the hot water circuit 5, for example, from tap water. Is heated by the heat exchange unit 38a. In particular, in the case of this embodiment, the refrigerant is the double tube heat exchanger 1
2, since both the first heat exchange unit 12a and the second heat exchange unit 12b flow, there is an advantage that a large amount of heat transfer from the refrigerant to the hot water can be secured.

Next, referring to FIG. 5, a description will be given of an operation state in which only indoor heating is performed without supplying hot water.

In this operating state, the solenoid valve 32 is closed and the solenoid valve 35 is opened in the hot water circuit 5. Thereby, the hot water circulating in the hot water circuit 5 is circulated through the hot water bypass passage 36, and the hot water is not supplied to the radiator 33 or the hot water storage tank 37.

In the circulation circuit 8 of the refrigerant circuit 4, the solenoid valves 24 and 25 are closed, the other solenoid valves are opened, and the first port 6a and the fourth port 6d of the four-way valve 6 are opened. And between the second port 6b and the third port 6c.

Thus, the refrigerant compressed by the compressor 2 is first supplied from the fourth port 6d to the indoor heat exchanger 18, and then passes through the electronic expansion valve 17 for cooling, the receiver tank 16, and the electronic valve for heating. It reaches the outdoor heat exchanger 14 through the expansion valve 15 and absorbs heat from the atmosphere.

A part of the refrigerant flowing out of the outdoor heat exchanger 14 is
The heat is supplied to the first heat exchange unit 12 a via the electromagnetic valve 13, and receives heat from hot water circulating in the hot water circuit 5. The remainder of the refrigerant that has exited from the outdoor heat exchanger 14 is supplied directly to the third port 6c side of the four-way valve 6 via the bypass 21. In addition,
The refrigerant that has passed through the first heat exchange section 12a of the double-pipe heat exchanger 12 merges with the remaining refrigerant via the electromagnetic valve 11, and is supplied to the third port 6c. These refrigerants are then supplied to the compressor 2
And the circulation of the above-mentioned path is repeated.

In this operating state, since the refrigerant can take in both the heat of the outside air and the heat of the hot water, a large amount of heat can be used for indoor heating, and there is an advantage that the heating efficiency is improved.

Next, referring to FIG. 6, a description will be given of an operation state in which only the supply of hot water is performed without performing cooling and heating of the room.

In this operating state, both the solenoid valves 32 and 35 in the hot water circuit 5 are closed. As a result, the hot water circulating in the hot water circuit 5 is circulated to the hot water storage tank 37 via the hot water circulation path 38, and the hot water storage tank 37 heats, for example, water supplied from tap water in the heat exchange unit 38a so that the hot water can be used as hot water. Has become.

In the circulation circuit 8 of the refrigerant circuit 4, the solenoid valve 11, the solenoid valve 13, and the electronic expansion valve for cooling, that is, the second intermediate point P2 of the second refrigerant passage and the indoor heat exchanger 1
8 is closed, the other solenoid valves are opened, and the first port 6 of the four-way valve 6 is opened.
a and the fourth port 6d, and between the second port 6b and the third port 6c.

Thus, the refrigerant compressed by the compressor 2 is discharged from the fourth port 6d. However, since the cooling electronic expansion valve 17 is closed and the solenoid valve 25 is open, the bypass passage 23 Is supplied to the double tube heat exchanger 12.

The first heat exchange section 1 of the double tube heat exchanger 12
2a, in the second heat exchange section 12b, the refrigerant transfers its heat to the hot water flowing through the hot water circuit 5 to heat it. 77 The refrigerant that has exited the double-pipe heat exchanger 12 reaches the receiver tank 16 via the bypass 22 and then reaches the outdoor heat exchanger 14 via the heating electronic expansion valve 15 to recover heat from the atmosphere. The flow is returned to the compressor 2 from the second port 6b of the four-way valve 6 via the bypass passage 21.

In this operating state, the refrigerant recovers heat from the outside air in the outdoor heat exchanger 14 and uses the recovered heat to heat the hot water in the double-pipe heat exchanger 12. In this case, by using the first heat exchange section 12a and the second heat exchange section 12b in the double-tube heat exchanger 12 at the same time, the heat of the refrigerant can be sufficiently converted into hot water. It is efficient because it can be transmitted.

Next, a description will be given of an operation state in the case where hot water is supplied simultaneously with heating with reference to FIG.

In this operating state, the solenoid valves 32 and 35 in the hot water circuit 5 are closed. As a result, the hot water circulating in the hot water circuit 5 is circulated to the hot water storage tank 37 via the hot water circulation path 38, and for example, the hot water from the tap water is heated in the hot water storage tank 37 by the heat exchange unit 38a and can be used as hot water. it can.

In the circulation circuit 8 of the refrigerant circuit 4, the solenoid valve 11, the solenoid valve 13, the solenoid valve 24 and the solenoid valve 2
5 is closed and the other solenoid valves are opened, and the four-way valve 6 communicates between the first port 6a and the fourth port 6d and between the second port 6b and the third port 6c. Let it.

Thus, the refrigerant compressed by the compressor 2 is first supplied from the fourth port 6d to the indoor heat exchanger 18, and thereafter, the cooling electronic expansion valve 17, the receiver tank 16, and the heating electronic expansion valve 17. The outdoor heat exchanger 1 via the expansion valve 15
4 is supplied.

In the outdoor heat exchanger 14, the refrigerant recovers heat from the atmosphere, and the refrigerant that has exited the outdoor heat exchanger 14 reaches the four-way valve 6 via the first bypass 21 and returns to the compressor 2. Is done.

In this operating state, no heat exchange is performed between the hot water and the refrigerant in the double tube heat exchanger 12, and only the exhaust heat of the engine 3 is supplied to the hot water as a heat source, and the indoor heating is not performed. Only heat recovered from the atmosphere by the outdoor heat exchanger 14 is used as a heat source.

When supplying water while heating, the heating electronic expansion valve 15 is opened, and the compressor 2, the first refrigerant passage,
Indoor heat exchanger 18, second refrigerant passage, cooling electronic expansion valve 1
7, while circulating the refrigerant in the order of the third refrigerant passage, the heating electronic expansion valve 15, the outdoor heat exchanger 14, and the fourth refrigerant passage,
The electromagnetic valve 25 as the second on-off valve, the electromagnetic valve 24 as the third on-off valve, the electromagnetic valve 13 as the fourth on-off valve, and the electromagnetic valve 11 as the fifth on-off valve are closed, and the hot water bypass passage on-off valve 35 is also closed. Closed. Thus, the heat is taken in from the outside by the outdoor heat exchanger 14, the energy is given to the refrigerant by the work of the engine-driven compressor 2, and then the room is heated by the condensation heat of the refrigerant in the indoor heat exchanger 18. In the hot water circuit 5, the engine exhaust heat is absorbed by the circulating cooling water, and the engine exhaust heat is supplied to the hot water storage tank 37.

As apparent from the above operation states,
In the double-tube heat exchanger 12 of this embodiment, when heat is supplied from the refrigerant to the hot water, the increase in the amount of transferred heat is achieved by using both the first heat exchange unit 12a and the second heat exchange unit 12b. On the contrary, when heat is supplied from the warm water to the refrigerant, the heat transfer amount is limited to an appropriate amount by using only the first heat exchange unit 12a so that the heat transfer amount does not become excessive.

Therefore, by using the double-tube heat exchanger 12 having a relatively simple structure as described above, it is possible to accurately adjust the amount of heat exchanged.

[0053]

As described above, according to the first aspect of the invention, when the hot water in the hot water storage tank is not used while radiating heat in the indoor heat exchanger, the hot water bypass passage opening / closing valve is opened. The exhaust heat is efficiently supplied to the double-tube heat exchanger, while in the refrigerant circuit, the refrigerant condensed and released in the indoor heat exchanger is absorbed and evaporated in the outdoor heat exchanger, and the refrigerant from the outdoor heat exchanger Is circulated to a part of the double tube heat exchanger and is heated by the engine exhaust heat, whereby the refrigerant recovers the engine exhaust heat and is used for indoor heating.

When the hot water in the hot water storage tank is used while the indoor heat exchanger does not radiate heat, the refrigerant condenses in the double pipe heat exchanger and radiates heat to the circulating cooling water, and the radiated refrigerant passes through the expansion valve. As a result, the room is not heated because the refrigerant does not circulate through the indoor heat exchanger because the pressure is lowered to a low pressure and the heat is evaporated and absorbed in the outdoor heat exchanger to be gasified and sucked into the compressor. Cooling water is provided with both refrigerant condensation heat and engine exhaust heat.

As described above, the double-pipe heat exchanger can meet the requirements for indoor heating and the requirement for hot water supply, and can perform heat transfer from the cooling water to the refrigerant and heat transfer from the refrigerant to the hot water. That is, the heat of condensation of the refrigerant and the exhaust heat of the engine can be efficiently distributed to the room or the hot water supply in accordance with the indoor heating demand and the demand for hot water use. The amount of heat exchanged between the refrigerant and the refrigerant in the refrigerant circuit can be adjusted relatively accurately with a simple structure.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an engine-driven heat pump device.

FIG. 2 is a longitudinal sectional view of a double tube heat exchanger.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram of an engine-driven heat pump device in a cooling and hot water supply operation state.

FIG. 5 is an explanatory diagram of an engine-driven heat pump device in a heating-only operation state.

FIG. 6 is an explanatory diagram of an engine-driven heat pump device in an operation state in which only hot water is supplied.

FIG. 7 is an explanatory diagram of an engine-driven heat pump device in a heating and hot water supply operation state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine drive type heat pump apparatus 2 Compressor 3 Engine 4 Refrigerant circuit 5 Hot water circuit 12 Double pipe heat exchanger 41 Inner pipe 42 Outer pipe 42a 1st port 42b 2nd port 42c 3rd port

Claims (1)

(57) [Claims] 1. A hot water circuit (5) for driving a compressor (2) by a water-cooled engine (3) to circulate refrigerant in a refrigerant circuit (4) and circulating hot water generated by cooling the engine (3). in engine-driven heat pump apparatus having the refrigerant circuit 4 double heat exchanger 12 forming a conduit to form a so as to cover the outside of the hot water pipe to form the said hot water circuit 5, since the hot water available of the hot water storage tank 37 of the heat exchange portion 38a, the double-pipe heat exchanger 12, the engine 3 of the water jacket, an exhaust gas heat exchanger 31, in the order of the heat exchange portion 38a of the savings water tank 37, a main hot water passage communicating each In the main hot water passage, an intermediate portion between the exhaust gas heat exchanger 31 and the heat exchange portion 38a and an intermediate portion between the heat exchange portion 38a and the double pipe heat exchanger 12 communicate with each other. Hot water bypass passage 36 And a hot water bypass passage opening / closing valve 35 provided in the middle of the hot water bypass passage, and when the main hot water passage is divided into two parts by the communicating portions at both ends of the hot water bypass passage 36, the hot water is supplied to the hot water storage tank side in the order described above. The refrigerant circuit 4 is provided with a circulating cooling water pump 34. The first refrigerant circuit 4 communicates the discharge side of the compressor 2 with the indoor heat exchanger 18.
A refrigerant passage, a second refrigerant passage communicating the indoor heat exchanger 18 with the expansion valve 15, a third refrigerant passage communicating the expansion valve 15 with the outdoor heat exchanger 14, and the outdoor heat exchanger 14. And a fourth refrigerant passage communicating with the suction side of the compressor 2, a first intermediate portion P <b> 1 in the middle of the first refrigerant passage, and one end of the double pipe heat exchanger 12. A fifth refrigerant passage, a sixth refrigerant passage communicating the other end of the double-tube heat exchanger 12, and a second intermediate portion P2 in the middle of the second refrigerant passage, and a fourth refrigerant. a third intermediate portion P3 of the middle of the passage, the double-pipe heat exchanger 12 and the intermediate portion P of the seventh coolant passage communicating said third intermediate portion P3 and the compressor of the fourth refrigerant passage 2
The fourth intermediate portion P4, the fifth cold as the suction side of the middle
An eighth refrigerant passage communicating with a fifth intermediate portion P5 located in the middle of the medium passage; and a first opening / closing valve disposed midway between the second intermediate portion P2 of the second refrigerant passage and the indoor heat exchanger 18. 17, the fifth intermediate portion P5 which is a part of the fifth refrigerant passage , and
The second on-off valve 25, the third on-off valve 24, and the fourth on-off valve disposed respectively in the middle of the refrigerant passage between the first intermediate portion P1, the sixth refrigerant passage, the seventh refrigerant passage, and the eighth refrigerant passage.
The on-off valve 13 and the fifth on-off valve 11 are arranged. When the hot water in the hot water storage tank 37 is not used while radiating heat in the indoor heat exchanger 18, the first on-off valve 17 is opened and the compression is performed. Machine 2, the first refrigerant passage, the indoor heat exchanger 18,
The refrigerant circulates in the order of the second refrigerant passage, the expansion valve 15, the third refrigerant passage, the outdoor heat exchanger 14, and the fourth refrigerant passage, and the second on-off valve 25 and the third on-off valve 24 one of the closed and the fourth on-off valve 13 and the fifth on-off valve 11 is opened, using the hot water bypass channel opening and closing valve 35 is opened, hot water while hot water storage tank 37 is not radiated in the indoor heat exchanger 18 When the first on-off valve 17 is closed, the second on-off valve 25 and the third on-off valve 24 are opened, while the fourth on-off valve 13 and the fifth on-off valve 11 are closed. The compressor 2, the fifth refrigerant passage, the double pipe heat exchanger 12, the sixth refrigerant passage, the expansion valve 15, the third refrigerant passage, the outdoor heat exchanger 14, and the fourth refrigerant passage in this order. The refrigerant is circulated and the hot water bypass passage opening / closing valve 3 5. An engine-driven heat pump device wherein 5 is closed.