JPS61190263A - Engine-driven heat pump device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to an engine driven engine that performs heat pump cooling/heating operation or heat pump hot water heating by being driven by an internal combustion engine (engine) +C using natural gas or oil as a total heat source. This invention relates to a seat pump device.

BACKGROUND ART FIG. 2 shows a configuration diagram of a conventional engine-driven heat pump device.

In the figure, 1' is the engine that carries the exhaust gas heat exchanger 2', G is the exhaust gas discharge muffler, 4' is the starter that fully starts the engine 1', 5' is the compressor driven by the engine 1, 6' is a four-way valve, 7a' is an outdoor fan, and 7 b
'' is an outdoor heat exchanger, 8' is a pressure reducer, 9b is an indoor heat exchanger, and 9a' is an indoor fan. All three vanes are connected in this order to form a cooling/heating heat pump circuit A', and this cooling/heating heat pump circuit The refrigerant circuit is branched from A' via the solenoid valve 17ai, and the fluid 12''lc'A in the heat storage tank 11' is
A heat pump hot water supply circuit Bi has a heater 13' for exchanging heat using condensation heat of the medium. and the engine 1
The exhaust heat recovery circuit includes an exhaust heat exchanger 14' that circulates cooling water through the exhaust gas heat exchanger 2 with a pump 19' to recover exhaust heat, and heats the fluid 12' in the heat storage tank 11' by exchanging heat with the fluid 12'. c.
It consists of t.

15' is a radiator, which is installed in series with the outdoor heat exchanger 7b with respect to the flow of air, and is blown and cooled by the outdoor fan 7a.
A three-way solenoid valve 16' is movably inserted between the heat sink 14' and the downstream side of the heat sink 14'.

This is to prevent the engine 1' from overheating.The more the fluid 12' does not exchange heat with the fluid in the heat storage tank 14', the more the humidity of the fluid 12' increases, and the temperature of the cooling water that should cool the engine 1' increases. If the engine rises, the water three-way valve 16' is switched to flow the cooling medium to the radiator 15 side, and the engine 1
The exhaust heat recovered from the exhaust gas heat exchanger 2' and the exhaust gas heat exchanger 2' is radiated to the atmosphere.

Problems to be Solved by the Invention In addition, conventional engine-driven heat pump devices (for example, a device with a configuration similar to that of Japanese Patent Application Laid-open No. 56-30568)
In this case, when the temperature of the cooling water exceeds a certain level, the radiator 15 operates to collect the exhaust heat from the engine, but with this configuration, the radiator 15' is required separately, resulting in an increase in cost due to an increase in the number of parts. Ta.

Furthermore, since the outdoor fan 7a ventilates the outdoor heat exchanger 7b and the radiator 15 in series, extra fan power is required for the ventilation resistance of the radiator 15'.
Even when the fan 5 is not operating, the fan power does not decrease, resulting in a disadvantage that energy saving performance is reduced.

The present invention eliminates the above-mentioned conventional drawbacks by providing a refrigerant heater in the exhaust heat recovery circuit, a refrigerant pump in the cooling/heating heat pump circuit, and connecting the refrigerant heater with the refrigerant to the compressor discharge side. By configuring the entire refrigerant heating circuit, the refrigerant pump is activated 5 vanes during heating operation to improve refrigerant circuit efficiency, and when the cooling water reaches a predetermined temperature or higher during cooling operation, the refrigerant pump is activated. The engine heat is dissipated from the outdoor heat exchanger, and the radiator is removed. In addition, the radiator removal means and the exhaust heat recovery means for heating capacity are both used to improve functionality, and even when performing the same function as a radiator during cooling operation, it provides a means to minimize the decline in refrigerant circuit efficiency. It is something to do.

Means for Solving the Problems To achieve the above objects, the present invention provides an engine, a compressor driven by the engine, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger, and a condensate liquid. a heat pump hot water supply circuit having a heating/cooling heat pump circuit which sequentially connects storage devices, a heat pump hot water supply circuit having a heater which is branched from the cooling/heating heat pump circuit via a solenoid valve and heats the fluid in the heat storage tank with the condensation heat of the refrigerant, and the exhaust gas heat of the engine. An exhaust heat recovery circuit having a heat exhaust device that circulates cooling water through the exchanger with a pump to recover exhaust heat and exchanges heat with the fluid in the heat storage tank is provided, and in the exhaust heat circuit. A refrigerant heater that gives exhaust heat to the refrigerant side is provided downstream of the heat exhaust device, and in the cooling/heating heat pump circuit, a refrigerant pump and a refrigerant heater are provided downstream of the condensate liquid reservoir, A refrigerant heating circuit is provided that communicates with the discharge side of the compressor via a check valve, and the refrigerant pump is operated during heating operation, and the engine exhaust heat is not only used for heating, but also used for cooling during cooling operation. A function is provided to operate a refrigerant pump when the humidity of water reaches a predetermined level or higher to radiate excess engine exhaust heat from the outdoor heat exchanger.

Effects of the present invention With the above-described configuration, when the amount of heat recovered in the exhaust heat generator decreases during heating operation, the surplus amount is recovered in the refrigerant heater and used to improve heating capacity, and during cooling operation, the above-mentioned method is used. The excess heat is radiated by an outdoor heat exchanger. As a result, the traditional radiator is eliminated and the fan power of the outdoor fan does not need to be increased.

In addition, since the cooling water flows into the refrigerant heater after passing through the heat exhaust device, only the true surplus waste heat is radiated by the outdoor heat exchanger even during cooling, and the refrigerant The increase in high pressure in the circuit is also minimized, and the decrease in refrigerant circuit efficiency can also be kept to a minimum.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG.

In the figure, 1 is an engine having an exhaust gas heat exchanger 2, 3 is an exhaust gas discharge muffler, 4 is a starter that starts the engine 1, 5 is a compressor driven by the engine 1,
6 is a four-way valve, 7a is an outdoor fan, 7b is an outdoor heat exchanger,
8a is an indoor fan, 8b is an indoor heat exchanger, 9 is a condensate liquid reservoir, 12 is a heating pressure reducer, 11 is a cooling pressure reducer, 1
3a is a solenoid valve that opens during heating; 14 is a solenoid valve that opens during cooling; 1
3b is a check valve that can be passed during cooling, and 15 is a check valve that can be passed during heating. A heat pump hot water supply circuit Be having a heater 17 that branches the refrigerant circuit through an open electromagnetic valve 16ak and exchanges heat with the fluid 25 in the heat storage tank 24 using the condensation heat of the refrigerant.
It consists of Here, 18 is a pressure reducer during heat pump hot water supply operation, and 19 and 16b are check valves that completely fix the flow direction of the refrigerant. The exhaust gas has a heat exhaust device 22 that circulates cooling water through the engine 1 and the exhaust gas heat exchanger 2 using a pump 23 to recover exhaust heat, and heats it by exchanging heat with the fluid 25 in the heat storage PA 24. A heat recovery port 24c2 is configured. In this heat exhaust circuit, on the downstream side of the heat exhaust device 22,
A refrigerant heater 20 is provided to give exhaust heat to the refrigerant side, a refrigerant pump 10 is provided in the refrigerant heat pump circuit on the downstream side of the condensate liquid reservoir 9, and a refrigerant heater 2 is provided on the downstream side of the refrigerant pump 10.
A refrigerant heating passage is provided which communicates with the discharge side of the compressor 6 via the check valve 21 via the refrigerant 0.

This check valve 21 may be provided on the suction side of the refrigerant pump 10.

In the above configuration, the 11 works are explained. When operating the heat pump, first start the engine 1 with the starter 4, drive the compression mode 5, switch the four-way valve 6 according to the hot water operation, and During cooling in the heat pump circuit AIC, a refrigerant (not shown) is caused to flow as indicated by the solid arrow line, so that the outdoor heat exchanger 7b functions as a condenser, and the indoor heat exchanger abi functions as an evaporator. Outdoor heat exchanger 7b
The refrigerant that exits passes through the solenoid valve 14, and some condensed liquid accumulates in the liquid reservoir 9, but then flows to the indoor heat exchanger 8b via the cooling pressure reducer 11, and then via the check valve 13bk. , and finally returns to compressor 1.

During heating operation, on the other hand, the refrigerant flows as indicated by the dotted arrow, causing the outdoor heat exchanger 7b to function as an evaporator, and the indoor heat exchanger 8b to function as a condenser, passing through the solenoid valve 13ai and refrigerant flowing through the indoor heat exchanger 8b.
The refrigerant that has flowed out passes through the check valve 15, and some condensed liquid accumulates in the liquid reservoir 9, but then flows into the outdoor heat exchanger 7b via the heating pressure reducer 12.

It condenses and flows at 17, passes through a check valve 19, a hot water supply pressure reducer 10, and a vane 18, and evaporates at an outdoor heat exchanger 7b. In both the cooling/heating heat pump operation and the heat pump hot water supply operation, the engine 1 is operated, so by using the exhaust heat recovery circuit C at the same time, cooling water (not shown) is supplied from the engine 1 and the exhaust gas heat exchanger 21C to the pump 23IC. ), the waste heat is recovered, and the fluid 25 in the heat storage tank 24 is collected by the heat exhaust device 22.
After heating, the refrigerant is sucked into the pump 23 via the refrigerant heater 20.

When the refrigerant pump 10 is operated during heat pump heating operation, the condensate accumulated in the liquid reservoir 9 flows into the refrigerant heating circuit, and the refrigerant recovers engine exhaust heat in the refrigerant heater 20.
The high-pressure gaseous refrigerant passes through the check valve 21 to the compressor 5.
is returned to the discharge side.

The refrigerant is mixed with the refrigerant discharged from the compressor 5 and flows to the indoor heat exchanger 8b, and part of the engine exhaust heat is given to heating through the refrigerant, so that the refrigerant circuit efficiency during heating operation is the same.

Furthermore, the temperature of the fluid 25 that can be heated by the heater 17 of the heat pump hot water supply circuit B is generally about 55°C based on the refrigerant pressure conditions, but the temperature of the fluid 25 that can be heated by the heater 17 of the heat pump hot water supply circuit B is about 55°C. The temperature of the fluid 25 is between 85 and 90.
It is about °C. The fluid 2 heated by the heater 17
5 is further heated by a heat exhauster 22. During cooling operation, when the temperature of the fluid 25 in the heat storage tank 24 rises in the exhaust heat recovery circuit C, the cooling water exchanges heat with the fluid 25 in the heat exhaust device 22 and is further discharged. The temperature of the cooling water in the heater 22 rises. and engine 1
If the cooling water temperature exceeds a certain set value, the refrigerant pump 10 is operated to send condensate to the refrigerant heater 20.
Then, the high-pressure gaseous refrigerant is vaporized by the engine exhaust heat and mixed with the discharge gas of the compressor 5, and then transferred to the outdoor heat exchanger 7b.
It is discarded as condensation heat.

At this time, the heat radiation load of the outdoor heat exchanger 7b is
increases by the amount of heat given to the refrigerant. As a result,
The condensing pressure in the refrigerant circuit increases and the refrigerant circuit efficiency decreases. However, since the cooling water flows into the refrigerant heater 20 after completely passing through the heat exhaust device 22 in the heat storage tank 24, it constantly exchanges heat with the fluid 25, and the inlet temperature of the refrigerant heater 20 decreases, reducing the heat dissipation load described above. The reduction in refrigerant circuit efficiency due to an increase in condensing pressure is kept to the minimum necessary.

In this way, by using the outdoor heat exchanger 7b to dissipate excess heat from the engine, a radiator becomes unnecessary9, and costs can be reduced by reducing the number of parts. In other words, the refrigerant heating circuit is intended to be used not only to improve refrigerant circuit efficiency during heating operation, but also to dissipate excess engine heat during cooling operation while minimizing the decrease in refrigerant circuit efficiency. It is.

Effects of the Invention As described in 2, the present invention provides an engine, a compressor driven by the engine, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger, and a condensate reservoir, all in sequence. A connected cooling/heating heat pump circuit, a heat pump hot water supply circuit having a heater branched from the cooling/heating heat pump circuit via a solenoid valve and heating the fluid in the heat storage tank with the condensation heat of the refrigerant, and cooling to the exhaust gas heat exchanger of the engine. A heat exhaust circuit having a heat exhaust device that circulates water with a pump to recover all of the exhaust heat and exchanges the exhaust heat with the fluid in the heat storage tank is provided, and the heat exhaust circuit is provided in the heat exhaust circuit. A refrigerant heater that gives exhaust heat to the refrigerant side is provided on the downstream side of the cooling/heating heat pump circuit, and a refrigerant pump is installed downstream of the condensate liquid reservoir, and a refrigerant heater is provided on the discharge side of the compressor via the refrigerant heater. All stages of the refrigerant heating circuit are connected to the refrigerant, and during heating operation, the liquid pump is operated to send the condensate from the condensate reservoir to the total refrigerant heater, and the engine exhaust heat is recovered on the refrigerant side and used for heating. This results in energy savings by improving refrigerant circuit efficiency. Furthermore, when the cooling water reaches a predetermined temperature during cooling operation, the refrigerant pump is activated, and as mentioned above, excess engine exhaust heat is recovered on the refrigerant side and radiated by the outdoor heat exchanger, eliminating the need for a radiator. Therefore, the cost can be reduced by reducing the number of parts, and at the same time, it has various effects such as minimizing the reduction in refrigerant circuit efficiency.

[Brief explanation of the drawing]

Figure 1 shows the engine-driven heat pump device of the present invention 4
FIG. 2 is a circuit diagram showing one embodiment of the page, and FIG. 2 is a circuit diagram of a conventional engine-driven heat pump device. 1...Engine, 5...Compressor, 6.
...Four-way valve, 7a...Outdoor fan, 7b
...Outdoor heat exchanger, 8a...Indoor fan, 8b...Indoor heat exchanger, 9...Condensate liquid reservoir, 11... ...Air conditioner pressure reducer, 12...
... Pressure reducer for heating, 18 ... Pressure reducer for heat pump hot water supply, 10 ... Refrigerant pump, 17 ...
... Heater, 22 ... Heat exhaust device, 20 ...
...Refrigerant heater, 24... Heat storage tank, A...
...Cooling/heating heat pump circuit, B...Heat pump hot water supply circuit, C...Exhaust heat recovery circuit.

Claims (1)

[Claims] An engine, a cooling/heating heat pump circuit which sequentially connects a compressor driven by the engine, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger, and a condensate liquid reservoir, and a solenoid valve from the cooling/heating heat pump circuit. A heat pump hot water supply circuit has a heater that heats the fluid in the heat storage tank with the condensation heat of the refrigerant, and the cooling water is circulated by a pump to the exhaust gas heat exchanger of the engine to recover exhaust heat. and a heat exhaust circuit having a heat exhauster that exchanges heat with the fluid in the heat storage tank, and a refrigerant heater that gives exhaust heat to the refrigerant side is provided in the heat exhaust circuit downstream of the heat exhauster. , a refrigerant heating circuit is provided in the cooling/heating heat pump circuit, which is connected to the discharge side of the compressor via a refrigerant pump and a refrigerant heater on the downstream side of the condensate liquid reservoir, and further, during heating operation, the refrigerant pump The engine exhaust heat is used for heating, and during cooling operation, when the cooling water reaches a predetermined temperature or higher, the refrigerant pump is operated to radiate excess heat from the engine from the outdoor heat exchanger. An engine-driven heat pump device equipped with a means for