JPH06272993A - Engine-driven cooler/heater - Google Patents

Abstract

PURPOSE:To prevent freezing in a cold temperature area, corrosion of a coolant circuit, a decrease in performance of an engine due to a temperature rise of the atmosphere as a problem when coolant containing water as a main ingredient is used to cool the engine. CONSTITUTION:The engine-driven cooler/heater comprises a cooler/heater circuit 9 provided by sequentially connecting a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, a pressure reducing unit 5, an indoor heat exchanger 5 via a refrigerant tube 8, an engine 1 for driving the compressor 2, and an engine cooling heat exchanger 13 to be heat exchanged with the engine 1, wherein the exchanger 13 is connected between the valve 3 and a refrigerant suction passage of the compressor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven cooling and heating apparatus that cools and heats a compressor by driving it with an engine that is operated by using natural gas, oil, or the like as a heat source.

[0002]

2. Description of the Related Art FIG. 4 shows, for example, JP-A-63-20796.
FIG. 3 is a configuration diagram of a conventional engine-driven cooling and heating apparatus disclosed in Japanese Patent Publication No. 3 publication, in which 2 is a compressor driven by an engine 1 operated by using natural gas or oil as a heat source, 3 is a four-way valve, 4 Is an outdoor heat exchanger, 4a is an outdoor fan that blows air to the outdoor heat exchanger 4, 5 is a decompressor, 6 is an indoor heat exchanger, and 6a is an indoor fan that blows air to the indoor heat exchanger 6, 7
Is a gas-liquid separator, and a cooling and heating circuit 9 is configured by sequentially connecting these with a refrigerant pipe 8. 10 is an engine cooling heat exchanger through which cooling water flows, 11 is a cooling water pump, 1
2 is a radiator for heat dissipation.

Next, the operation will be described. The compressor 2 is driven by the engine 1. During the cooling operation, the four-way valve 3 is switched to the direction of the solid line, and the refrigerant flows in the direction of the solid line arrow. The high-temperature high-pressure refrigerant gas discharged from the compressor 2 exchanges heat with the air sent from the outdoor fan 4a in the outdoor heat exchanger 4 through the four-way valve 3 and is cooled and condensed. Then, it is decompressed by the decompressor 5 and becomes a low-temperature low-pressure liquid refrigerant, which is sent to the indoor heat exchanger 6 and exchanges heat with the air sent from the indoor fan 6a in the indoor heat exchanger 6 to cool the air to a cooling space such as a room. The air is blown out to cool the cooling space. The refrigerant gasified by the heat exchange with the air is introduced into the gas-liquid separator 7 through the four-way valve 3, and the liquid refrigerant that has not been evaporated in the indoor heat exchanger 6 is separated from the refrigerant gas. Collect at the bottom and the refrigerant gas returns to the compressor 2. Further, during the heating operation, the four-way valve 3 is switched in the direction of the broken line, the refrigerant flows in the direction of the broken line arrow, and the operation thereof is the same as that of the above-described cooling operation, so its explanation is omitted. On the other hand, the exhaust heat generated in the engine 1 that drives the compressor 2 is the engine cooling heat exchanger 1
The cooling water is collected by circulating the cooling water to 0 by the pump 11, and is radiated by the outdoor fan 4a and the radiator 12 which is cooled by air blowing at the same time as the outdoor heat exchanger 4, and the engine 1 is cooled.

[0004]

In the conventional engine-driven cooling and heating system configured as described above, cooling water containing water as a main component is used for cooling the engine.
In cold regions, there are problems such as freezing and corrosion of the engine cooling heat exchanger and the cooling water circuit, and when the outside air temperature rises because the engine cooling depends on the outside air temperature, the engine temperature However, there was a problem that the engine performance also deteriorated. In particular, when a Stirling engine using a Stirling cycle whose theoretical thermal efficiency is equal to Caruno efficiency is used, the cooling performance of the engine greatly affects the engine performance.

The present invention has been made to solve the above problems, and provides an engine-driven cooling and heating apparatus which is capable of preventing corrosion and keeping the engine temperature low even when the outside air temperature rises. It is characterized by doing.

[0006]

An engine-driven cooling and heating system according to the present invention comprises a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger, which are sequentially connected by a refrigerant pipe. The engine that drives the compressor is cooled by the refrigerant flowing from the four-way valve of the cooling and heating circuit to the compressor. Further, a second decompressor for branching and decompressing the refrigerant flowing into the decompressor of the cooling and heating circuit is provided, and the engine that drives the compressor is cooled by the refrigerant decompressed by the second decompressor. .

[0007]

In the engine-driven cooling and heating apparatus according to the present invention, the exhaust heat generated in the engine by heat exchange with the refrigerant flowing in the heating and cooling circuit is removed, and the cooling of the engine is not affected by the outside air temperature.

[0008]

【Example】

Example 1. 1 is a configuration diagram of an engine-driven cooling and heating apparatus according to Embodiment 1 of the present invention. In FIG. 1, what is different from FIG. 4 is a cooling medium flow passage formed in a cylinder (not shown) of the engine 1. The engine cooling heat exchanger 13 is connected between the four-way valve 3 and the refrigerant suction passage 2a of the compressor 2 via the gas-liquid separator 7.

Next, the operation will be described. The compressor 2 is driven by the engine 1. During the cooling operation, the four-way valve 3 is switched to the direction of the solid line, and the refrigerant flows in the direction of the solid arrow. The high temperature and high pressure refrigerant gas discharged from the compressor 1 exchanges heat with the air sent from the outdoor fan 4a in the outdoor heat exchanger 4 through the four-way valve 3 and is cooled and condensed. Then, it is decompressed by the decompressor 5 and becomes a low-temperature low-pressure liquid refrigerant. This liquid refrigerant is sent to the engine cooling heat exchanger 13 via the indoor heat exchanger 6 and exchanges heat with the air sent from the indoor fan 6a in the indoor heat exchanger 6, and at the same time, the engine cooling heat exchanger 13
In step 1, heat is exchanged with the engine 1 and exhaust heat generated in the engine 1 is recovered to cool the engine 1. The air cooled by heat exchange with the indoor heat exchanger 6 is blown out into a cooling space such as a room to cool the cooling space. The refrigerant gasified by the heat exchange with the air and the engine 1 is introduced into the gas-liquid separator 7 through the four-way valve 3 to separate the liquid refrigerant not evaporated in the indoor heat exchanger 6 and the engine 1 from the refrigerant gas. Then, the liquid refrigerant collects at the bottom, and the refrigerant gas returns to the compressor 2. Further, during the heating operation, the four-way valve 3 is switched to the direction indicated by the broken line, and the refrigerant flows in the direction indicated by the broken line arrow. Since the operation thereof is the same as the above-described cooling operation, the description thereof will be omitted.

Embodiment 2. 2 is a configuration diagram of an engine-driven cooling and heating apparatus according to Embodiment 2 of the present invention. In FIG. 1, the difference from FIG.
A first branch circuit 14 for branching the refrigerant between the outdoor heat exchanger 4 and the first pressure reducer 5 on the upstream side of the first pressure reducer 5 via the first electromagnetic valve 14a, and an upstream side of the first pressure reducer 5 during the heating operation. A second branch circuit for branching the refrigerant from the indoor heat exchanger 6 and the decompressor 5 via the second electromagnetic valve 15a is provided, and the first and second branch circuits 14 and 15 are connected to each other. The engine cooling heat exchanger 13 is connected between the four-way valve 3 of the cooling and heating circuit 9 and the gas-liquid separator 7 via the second pressure reducer 6.

Next, the operation will be described. During the cooling operation, as indicated by the solid arrow, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way valve 3 and is exchanged with the air sent from the outdoor fan 4a by the outdoor heat exchanger 4 to be cooled and condensed. It During the cooling operation, the first solenoid valve 14a is opened and the second solenoid valve 15a is closed, so that a part of the condensed refrigerant is branched to the first branch circuit 14 via the first solenoid valve 14a, and the others are (1) Decompressed by the decompressor 5 to become a low-temperature low-pressure liquid refrigerant, which is sent to the outdoor heat exchanger 4, and is gasified by heat exchange with the air sent from the outdoor fan 4a in the outdoor heat exchanger 4. The air cooled by heat exchange with the indoor heat exchanger 6 is blown out into a cooling space such as a room to cool the cooling space. The liquid refrigerant branched to the first branch circuit 14 is decompressed by the second pressure reducer 16 to become a low-temperature low-pressure liquid refrigerant, which is sent to the engine cooling heat exchanger 13 and exchanges heat with the engine 1 in the engine cooling heat exchanger 13. Then, the exhaust heat generated in the engine 1 is recovered and the engine 1 is cooled. The refrigerant gasified by the heat exchange with the air is introduced into the gas-liquid separator 7 through the four-way valve 3, while the refrigerant gasified by the heat exchange with the engine 1 is introduced into the gas-liquid separator 7. It is separated into a liquid refrigerant and a refrigerant gas that have not been evaporated in the gas-liquid separator 7, the liquid refrigerant accumulates at the bottom, and the refrigerant gas returns to the compressor 2. Further, during the heating operation, the four-way valve 3 is switched in the direction of the broken line, the first electromagnetic valve 14 is closed, the second electromagnetic valve 15 is opened, and the refrigerant flows in the direction of the broken arrow. Since the operation is the same as that in the cooling operation described above, the description thereof will be omitted. According to this embodiment, the engine 1 is cooled regardless of the fluctuation of the heat load of the indoor heat exchanger 6.

Embodiment 3. 3 is a configuration diagram of an engine-driven cooling and heating apparatus according to Embodiment 3 of the present invention. In FIG. 3, the difference from FIG. 2 is the first and second solenoid valves 14
A three-way valve 17 is provided instead of a and 15a, and the refrigerant branched by the branch circuit 18 during the cooling operation is the second pressure reducer 1
The three-way valve 17 is switched so as to flow to the engine cooling heat exchanger 13 via 6, and the branch circuit 19 is used during the heating operation.
The three-way valve 17 is switched to cool the engine 1 so that the refrigerant branched by the flow through the second pressure reducer 16 to the engine cooling heat exchanger 13 has the same effect as the above embodiment. .

[0013]

As described above, according to the present invention, since the engine that drives the compressor is cooled by the refrigerant flowing in the cooling and heating circuit, corrosion is prevented, and even if the outside air temperature rises, the engine The temperature can be kept low, and the engine performance can be prevented from decreasing.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an engine-driven cooling and heating apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram showing an engine-driven cooling and heating apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a configuration diagram showing an engine-driven cooling and heating apparatus according to Embodiment 3 of the present invention.

FIG. 4 is a configuration diagram showing a conventional engine-driven cooling and heating device.

[Explanation of symbols]

 1 Engine 2 Compressor 2a Refrigerant Suction Path 3 Four-way Valve 4 Outdoor Heat Exchanger 5 Pressure Reducer 6 Indoor Heat Exchanger 7 Gas-Liquid Separator 8 Refrigerant Piping 9 Cooling and Heating Circuit 13 Engine Cooling Heat Exchanger

Claims (2)

[Claims] 1. A compressor, a four-way valve, an outdoor heat exchanger,
A decompressor and an indoor heat exchanger, which are sequentially connected by refrigerant pipes to an air conditioning circuit, an engine that drives the compressor,
An engine-driven cooling and heating device comprising an engine cooling heat exchanger for exchanging heat with the engine, wherein the engine cooling heat exchanger is connected between the four-way valve and a refrigerant suction passage of the compressor. 2. A compressor, a four-way valve, an outdoor heat exchanger,
A cooling and heating circuit in which a first pressure reducer and an indoor heat exchanger are sequentially connected by a refrigerant pipe, an engine that drives the compressor, and a refrigerant that flows into the first pressure reducer to branch and reduce the pressure. 2. An engine comprising a pressure reducer and an engine cooling heat exchanger for exchanging heat with the engine, wherein the engine cooling heat exchanger is connected between the second pressure reducer and the refrigerant suction passage of the compressor. Driven air conditioner.