JPH022066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat exchange device in which a compressor of a refrigeration circuit is driven by an internal combustion engine brought into contact with a heat medium housed in a can.

In a refrigeration circuit, it is inevitable that the refrigeration oil that lubricates the compressor is discharged into the compressor discharge pipe together with the refrigerant. Therefore, in general, an oil separator is connected to the discharge pipe of the compressor, where the refrigerating machine oil is separated from the refrigerant, and the separated refrigerating machine oil is returned through a capillary tube to the suction chamber of the compressor or the suction pipe near the compressor. This configuration has been adopted.
In the case of a refrigeration circuit with such a configuration, especially when the ambient temperature of the oil separator is low, such as in winter, the inside of the oil separator is cooled, the temperature of the refrigeration oil and refrigerant decreases, and as a result, the refrigerant The solubility of the refrigerant in refrigerating machine oil increases, and a large amount of refrigerant dissolves into the refrigerating machine oil collected in the lower part of the oil separator. Therefore, as the proportion of refrigerant drawn into the compressor through the capillary increases, the proportion of refrigerating machine oil decreases. Therefore, the lubrication effect of the compressor deteriorates,
There is a risk of causing wear in the inside of the compressor and each sliding part, and there is also the problem that the coefficient of performance decreases due to a decrease in the amount of refrigerant circulated in the refrigeration circuit.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems by effectively operating an oil separator provided on the discharge side of a compressor of a refrigeration circuit.

According to the present invention, an internal combustion engine is brought into contact with a heating medium housed in a can body, the compressor of a refrigeration circuit is driven by the internal combustion engine, and the heat generated during operation of the internal combustion engine is used to A heat exchange device configured to heat a heating medium, using an internal combustion engine, characterized in that an oil separator provided on the discharge side of the compressor is brought into contact with the heating medium inside the can. A heat exchange device is obtained.

The present invention will be described below using examples with reference to the drawings.

FIG. 1 shows an embodiment of the invention. 1st
In the figure, a heat medium 2 such as water is housed inside a first can body 1 having a heat insulating structure, and an internal combustion engine 3 having a watertight structure is brought into contact with this heat medium 2. The internal combustion engine 3 is held by a lid 4. Springs 5 and 6 are attached to the side and bottom surfaces of the internal combustion engine 3 and between them and the can body 1. An air supply pipe 7 and an exhaust pipe 8 for the internal combustion engine 3 pass through the lid 4 . In addition, an exhaust gas heat exchanger 9 is installed inside the can body 1 of the exhaust pipe 8.
is provided. In this way, when the internal combustion engine 3 is operating, the heat medium 2 is heated by the heat generated from the engine itself and the heat of the exhaust gas. At that time, the heat medium 2 in the can body 1 is at a relatively high temperature (for example, 75
℃). Note that 11 is an auxiliary electric heater.

A hot water supply heat exchanger 12 and a first heating heat exchanger 13 are further assembled inside the first can body 1. These heat exchangers 12 and 13 extract the temperature in the heat medium 2 by passing or circulating water. In this way, the temperature extracted by the hot water supply heat exchanger 12 contributes to hot water supply, and the temperature extracted by the first heating heat exchanger 13 contributes to relatively high-temperature heating.

Furthermore, an internal combustion engine 3 is attached to the lid 4 of the first can body 1.
A compressor 14 of the refrigeration circuit driven by the refrigeration circuit is also held. This refrigeration circuit includes, in addition to the compressor 14,
It has an oil separator 15, a condenser 16, an expansion valve 17, and an evaporator 18. Also oil separator 15
is connected at its lower part by a capillary tube 19 to a suction chamber of the compressor 14 or a suction pipe 21 near the compressor 14 . Now, when the compressor 14 is driven by the internal combustion engine 3, the refrigerant discharged into the discharge pipe 22 first undergoes oil separator 15 to remove refrigerating machine oil. The refrigerating machine oil removed in the oil separator 15 accumulates in the lower part of the oil separator 15, and is reduced in pressure through the capillary tube 19 due to the pressure difference between the suction side and the discharge side of the compressor 14, and is transferred to the suction side of the compressor 14. Return to On the other hand, the refrigerant radiates heat in the condenser 16, passes through the expansion valve 17, absorbs heat in the evaporator 18, and returns to the compressor 14 through the suction pipe 21. As a result, the heat medium 24 such as water in the second can body 23 having a heat insulating structure is heated.
At this time, the temperature of the heating medium 24 is relatively low (for example,
40-45℃). The temperature of the heat medium 24 thus obtained is taken out by the circulating water of the second heating heat exchanger 25, contributing to heating at a relatively low temperature.

Note that although the drawings only show a case where heating is performed using the heat radiation of the condenser 16, it goes without saying that cooling using the evaporator 18 is also possible.

Now, as mentioned above, the internal combustion engine 3 is brought into contact with the heating medium 2 housed in the first can body 1, and the internal combustion engine 3
In this heat exchange device, the compressor 14 of the refrigeration circuit is driven by the compressor 14 of the refrigeration circuit, and the heat medium 2 is heated by the heat generated during operation of the internal combustion engine 3. The oil separator 15 provided is immersed in the heating medium 2 in the first can body 1 . According to this, the ambient temperature of the oil separator 15 is maintained at a high temperature, so even when the outside temperature is low, such as in winter, the inside of the oil separator 15 is not cooled, and the solubility of the refrigerant in the refrigerator oil is small. It is maintained. Therefore, the proportion of refrigerant returning from the oil separator 15 to the compressor 14 through the capillary tube 19 decreases, and the proportion of refrigerant oil increases. Therefore, the lubrication effect of the compressor 14 is enhanced, the sliding parts of the compressor 14 are kept smoothly sliding, and the wear of the sliding parts is suppressed. Furthermore, the amount of refrigerant circulated in the refrigeration circuit increases, and a cooling/heating water heater with a large cooling/heating hot water supply capacity and a high coefficient of performance can be obtained.

Note that the temperature distribution of the heating medium 2 is such that the higher the layer, the higher the temperature. In view of this point, it is preferable to select the height of the oil separator 15 so that it is positioned above the heating medium 2.

Further, FIG. 2 shows another embodiment of the present invention in which an oil separator 15 is tightly attached to the outer wall surface of the cylinder portion of the internal combustion engine 3 using a mounting bracket 26 and bolts 27. According to this, the ambient temperature of the oil separator 15 is maintained at a higher temperature, and even when the temperature of the heating medium 2 is low at the time of starting the internal combustion engine 3, the temperature of the oil separator 15 becomes sufficiently high. 1st
There is an advantage that the same effect as in the illustrated embodiment can be obtained more effectively and immediately after the internal combustion engine 3 is started.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is a schematic configuration diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... First can body, 2... Heat medium, 3... Internal combustion engine, 12... Hot water supply heat exchanger, 13... First heating heat exchanger, 14... Compressor, 15... ...Oil separator, 16...Condenser, 17...Expansion valve, 18...
Evaporator, 19... capillary tube, 23... second can body,
24... Heat medium, 25... Second heating heat exchanger.

Claims (1)

[Claims] 1. An internal combustion engine is brought into contact with a heating medium housed in a can body, and a compressor of a refrigeration circuit is driven by the internal combustion engine, and the heat generated during operation of the internal combustion engine is A heat exchange device configured to heat the heating medium, characterized in that an oil separator provided on the discharge side of the compressor is brought into contact with the heating medium inside the can. Heat exchange device used. 2. A heat exchange device using an internal combustion engine according to claim 1, wherein the oil separator is closely attached to an outer wall surface of the internal combustion engine. 3. Claim 1, wherein the oil separator is located above the heating medium.
A heat exchange device using an internal combustion engine as described in 1.