CN114353379A - Carbon dioxide heat pump system with lubricating oil waste heat recovery function - Google Patents

Abstract

The invention discloses a carbon dioxide heat pump system with a lubricating oil waste heat recovery function, which comprises: the system comprises a compressor, an oil-gas separator, a cooler, a fresh air inlet device, a gas-liquid separator, a liquid storage tank, an expansion valve, an evaporator fan, a fresh air exhaust device and an oil waste heat recoverer; the low-temperature refrigerant outlet of the gas-liquid separator is connected with the refrigerant inlet of the oil waste heat recoverer, the refrigerant outlet of the oil waste heat recoverer is connected with the refrigerant inlet of the compressor, the lubricating oil outlet of the gas-liquid separator is connected with the lubricating oil inlet of the oil waste heat recoverer, and the lubricating oil outlet of the oil waste heat recoverer is connected with the lubricating oil inlet of the compressor. According to the invention, the oil waste heat recoverer is arranged, so that the heat of the lubricating oil is recovered, and the temperature of the lubricating oil is reduced to a normal level.

Description

A carbon dioxide heat pump system with lubricating oil waste heat recovery function

technical field

The invention relates to the technical field of heat pumps, in particular to a carbon dioxide heat pump system with a lubricating oil waste heat recovery function.

Background technique

Under the circumstance that the global environmental protection requirements are becoming more and more stringent, the application of environmentally friendly refrigerants has always been a hot topic in the HVAC and refrigeration industries. The characteristics of volume freezing capacity are favored by the HVAC and refrigeration industries. With the rapid popularization of carbon dioxide refrigerants, heat pumps using carbon dioxide refrigerants are also being used more and more widely. In the carbon dioxide heat pump and carbon dioxide refrigeration system, because the carbon dioxide refrigerant is easy to merge with the lubricating oil, an oil separator must be installed, otherwise the lubricating oil in the compressor will follow the carbon dioxide refrigerant into the system, which will quickly cause the compressor to lack oil. , and even cause the compressor to burn out without effective lubrication. However, the existing carbon dioxide heat pump system has the following problems: the heat in the lubricating oil is lost to the outside air when passing through the lubricating oil radiator, resulting in waste of heat energy; there is no fresh air device, which needs to be purchased and installed separately, which prolongs the installation time. Added cost.

In the prior art, Chinese utility model patent application number CN201921788566.X proposes a carbon dioxide compressor and a refrigeration system thereof. The carbon dioxide compressor includes: a casing, a motor, a cylinder assembly and an exhaust separator, and the cylinder assembly includes: A first cylinder used for secondary compression and a second cylinder used for primary compression; an upper cover exhaust port is arranged on the casing, and the first exhaust port of the first cylinder is communicated with the cavity of the casing, After the gas is discharged from the first exhaust port, it enters the cavity, and then is discharged out of the compressor through the exhaust port of the upper cover; the second exhaust port of the second cylinder is connected to the inlet of the exhaust liquid separator. The utility model effectively reduces the pressure of the compressor and the refrigeration system, reduces the exhaust temperature of the compressor, and improves the working efficiency of the compressor; The ratio relationship is limited, so that the air supply structure required by the existing secondary compressor is eliminated, the airflow disturbance caused by the air supply structure is avoided, and the operation stability of the compressor is improved. However, the heat of the compressor lubricating oil in the utility model patent application has not been recycled, resulting in waste of heat energy, and no fresh air device is integrated, resulting in prolonged installation time and increased cost.

SUMMARY OF THE INVENTION

Aiming at the deficiencies of the prior art, the present invention provides a carbon dioxide heat pump system with a lubricating oil waste heat recovery function.

The carbon dioxide heat pump system with lubricating oil waste heat recovery function includes: compressor, oil and gas separator, cooler, fresh air intake device, gas-liquid separator, liquid storage tank, expansion valve, evaporator, evaporator fan, Fresh air exhaust device, oil waste heat recovery device; the refrigerant outlet of the compressor on the compressor is connected to the refrigerant inlet of the oil and gas separator on the oil and gas separator through the refrigerant pipeline, and the refrigerant outlet of the oil and gas separator on the oil and gas separator is cooled by The refrigerant pipeline is connected to the refrigerant inlet of the cooler on the cooler, and the refrigerant outlet of the cooler on the cooler passes through the refrigerant pipeline through the fresh air intake device and the high temperature refrigerant of the gas-liquid separator on the upper right side of the gas-liquid separator. The inlet is connected, the heat transfer medium inlet and the heat transfer medium outlet on the cooler are respectively connected with the heating pipeline, and the high temperature refrigerant outlet of the gas-liquid separator on the lower right side of the gas-liquid separator is connected to the liquid storage tank, the expansion tank and the expansion tank through the refrigerant pipeline. The valve and the evaporator are connected in turn. The evaporator is connected to the low-temperature refrigerant inlet of the gas-liquid separator at the bottom of the gas-liquid separator through the refrigerant pipeline through the fresh air exhaust device. The top of the evaporator is fixed to increase the air flow. The fan, the low temperature refrigerant outlet of the gas-liquid separator at the top of the gas-liquid separator is connected to the refrigerant inlet of the oil waste heat recovery device on the upper left side of the oil waste heat recovery device through the refrigerant pipeline, and the oil waste heat recovery device is located at the upper right side of the oil waste heat recovery device. The refrigerant outlet of the waste heat recovery device is connected to the refrigerant inlet of the compressor on the left side of the compressor through the refrigerant pipeline, and the lubricating oil outlet of the oil-gas separator at the bottom of the oil-gas separator is connected to the oil waste heat recovery device on the oil waste heat recovery device through the lubricating oil pipeline. The lubricating oil inlet of the oil waste heat recovery device is connected to the lubricating oil inlet of the compressor, and the lubricating oil outlet of the oil waste heat recovery device on the oil waste heat recovery device is connected with the lubricating oil inlet of the compressor at the bottom of the compressor through the lubricating oil pipeline.

Further, the oil waste heat recovery device is a heat pipe heat exchanger, including: an upper shell of the recovery device, a lower shell of the recovery device connected to the bottom of the upper shell of the recovery device, and the top of the lower shell of the recovery device is connected to the oil waste heat recovery device. Plate, oil waste heat recovery separator partition divides the oil waste heat recovery chamber internal cavity into oil waste heat recovery upper channel on the upper side of the oil waste heat recovery separator for passing refrigerant and the oil waste heat recovery wall on the lower side of the oil waste heat recovery wall 11.7 The lower channel of the oil waste heat recovery device used to pass the lubricating oil, the heat pipe hole is provided on the baffle plate of the oil waste heat recovery device, the heat pipe element for heat exchange is inserted and fixed in the heat pipe hole, and the upper part of the heat pipe element is located in the upper channel of the oil waste heat recovery device The lower part is located in the lower channel of the oil waste heat recovery device.

Further, the oil-gas separator is a cyclone-type oil-gas separator.

Further, a floating ball valve connected to the lubricating oil outlet of the oil and gas separator for controlling the liquid level of the lubricating oil is arranged inside the oil-gas separator.

Further, the outer surface of the oil-gas separator is wound and fixed with a coil for cooling, the upper end of the coil is connected to the low-temperature refrigerant outlet of the gas-liquid separator, and the lower end is connected to the compressor refrigerant inlet.

Further, the oil waste heat recovery device further includes a proportional control valve for adjusting the flow rate of the lubricating oil provided on the lubricating oil pipeline connected to the lubricating oil inlet of the oil waste heat recovery device.

Further, the oil waste heat recovery device further includes an oil temperature sensor for detecting the temperature of the lubricating oil provided on the lubricating oil pipeline connected to the lubricating oil outlet of the oil waste heat recovery device.

Further, the fresh air intake device includes: an intake device casing, an intake radiator disposed in the intake device casing, and an intake fan connected to the inner wall of the intake device casing.

Further, the fresh air exhaust device includes: an exhaust device casing, an exhaust radiator disposed in the exhaust device casing, and an exhaust fan connected to the inner wall of the exhaust device casing.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The carbon dioxide heat pump system with lubricating oil waste heat recovery function can not only recover the lubricating oil heat, but also reduce the lubricating oil temperature to the normal level by setting the oil waste heat recovery device;

2. The carbon dioxide heat pump system with lubricating oil waste heat recovery function realizes the integration of the fresh air device by setting the fresh air heat exchanger and the exhaust air heat exchanger, avoids the repeated construction of the fresh air device, and saves the construction time and cost. .

Description of drawings

The accompanying drawing is a schematic structural diagram of the present invention.

Marked in the figure: 1-compressor, 1.1-compressor refrigerant inlet, 1.2-compressor refrigerant outlet, 1.3-compressor lubricating oil inlet, 2-oil-air separator, 2.1-oil-air separator refrigerant inlet, 2.2- oil-gas separator refrigerant outlet, 2.3- oil-gas separator lubricating oil outlet, 3-cooler, 3.1-cooler refrigerant inlet, 3.2-cooler refrigerant outlet, 3.3-heat transfer medium inlet, 3.4-heat transfer Medium outlet, 4- fresh air intake device, 4.1- intake device shell, 4.2- intake radiator, 4.3- intake fan, 5- gas-liquid separator, 5.1- gas-liquid separator high temperature refrigerant inlet, 5.2 - high temperature refrigerant outlet of gas-liquid separator, 5.3- low temperature refrigerant outlet of gas-liquid separator, 5.4- low temperature refrigerant inlet of gas-liquid separator, 6- liquid storage tank, 7- expansion valve, 8- evaporator, 9- Evaporator fan, 10-fresh air exhaust device, 10.1-exhaust device housing, 10.2-exhaust radiator, 10.3-exhaust fan, 11-oil waste heat recovery device, 11.1-oil waste heat recovery device refrigerant inlet, 11.2 - Refrigerant outlet of oil waste heat recovery device, 11.3- oil waste heat recovery device lubricating oil inlet, 11.4- oil waste heat recovery device lubricating oil outlet, 11.5- oil waste heat recovery device upper channel, 11.6- oil waste heat recovery device lower channel, 11.7- oil waste heat recovery device Waste heat recovery separator, 11.8 - heat pipe element, 11.9 - upper shell of recovery, 11.10 - lower shell of recovery, 12 - coil, 13 - lubricating oil pipeline.

Detailed ways

The specific embodiments of the carbon dioxide heat pump system with lubricating oil waste heat recovery function according to the present invention will be clearly and completely described below with reference to the accompanying drawings.

As shown in the attached drawings, the carbon dioxide heat pump system with lubricating oil waste heat recovery function includes: a compressor 1, an oil-gas separator 2, a cooler 3, a fresh air intake device 4, a gas-liquid separator 5, and a liquid storage tank 6. Expansion valve 7, evaporator 8, evaporator fan 9, fresh air exhaust device 10, oil waste heat recovery device 11; the compressor refrigerant outlet 1.2 on the compressor 1 passes through the refrigerant pipeline (not shown in the figure) and The oil-gas separator refrigerant inlet 2.1 on the oil-gas separator 2 is connected, and the oil-gas separator refrigerant outlet 2.2 on the oil-gas separator 2 is connected to the cooler refrigerant inlet 3.1 on the cooler 3 through the refrigerant pipeline, and the cooler 3 The refrigerant outlet 3.2 of the cooler on the top is connected to the high temperature refrigerant inlet 5.1 of the gas-liquid separator on the upper right side of the gas-liquid separator 5 through the refrigerant pipeline through the fresh air intake device 4, and the heat transfer medium inlet 3.3 on the cooler 3 is connected. and the heat transfer medium outlet 3.4 are respectively connected to the heating pipeline (not shown in the figure), and the high temperature refrigerant outlet 5.2 of the gas-liquid separator on the lower right side of the gas-liquid separator 5 is connected to the liquid storage tank 6 and the expansion valve through the refrigerant pipeline. 7. The evaporators 8 are connected in sequence. The evaporator 8 is connected to the low-temperature refrigerant inlet 5.4 of the gas-liquid separator located at the bottom of the gas-liquid separator 5 through the refrigerant pipeline through the fresh air exhaust device 10. The top of the evaporator 8 is fixed for increasing. The evaporator fan 9 with large air flow, the low temperature refrigerant outlet 5.3 of the gas-liquid separator located at the top of the gas-liquid separator 5 is connected with the oil waste heat recovery device refrigerant inlet 11.1 on the upper left side of the oil waste heat recovery device 11 through the refrigerant pipeline , the oil waste heat recovery device refrigerant outlet 11.2 located on the upper right side of the oil waste heat recovery device 11 is connected to the compressor refrigerant inlet 1.1 on the left side of the compressor 1 through the refrigerant pipeline, and the oil and gas separator at the bottom of the oil and gas separator 2 is lubricated The oil outlet 2.3 is connected to the lubricating oil inlet 11.3 of the oil waste heat recovery device 11 through the lubricating oil pipeline 13, and the lubricating oil outlet 11.4 of the oil waste heat recovery device on the oil waste heat recovery device 11 is connected to the compressor 1 through the lubricating oil pipeline 13. The bottom compressor lube oil inlet 1.3 is connected.

Further, the oil waste heat recovery device 11 is a heat-pipe heat exchanger, and includes an upper shell 11.9 of the recovery device, a lower shell 11.10 of the recovery device connected to the bottom of the upper shell 11.9 of the recovery device, and the lower shell 11.10 of the recovery device is connected to the top of the lower shell of the recovery device. The oil waste heat recovery device partition 11.7, the oil waste heat recovery device partition plate 11.7 partitions the internal cavity of the oil waste heat recovery device 11 into the oil waste heat recovery device upper channel 11.5 and the oil waste heat recovery device upper channel 11.5 and The lower channel 11.6 of the oil waste heat recovery device is located on the lower side of the oil waste heat recovery device partition plate 11.7 for passing the lubricating oil. The oil waste heat recovery device partition plate 11.7 is provided with heat pipe holes (not shown in the figure), which are used for heat exchange heat pipe elements 11.8 is inserted and fixed in the heat pipe hole, the upper part of the heat pipe element 11.8 is located in the upper channel 11.5 of the oil waste heat recovery device, and the lower part is located in the lower channel 11.6 of the oil waste heat recovery device.

Further, the oil-gas separator 2 is a cyclone-type oil-gas separator.

Further, a float valve (not shown in the figure) connected to the lubricating oil outlet 2.3 of the oil and gas separator for controlling the liquid level of the lubricating oil is arranged inside the oil-gas separator 2 .

Further, the outer surface of the oil-gas separator 2 is wound and fixed with a coil 12 for cooling, the upper end of the coil 12 is connected to the low-temperature refrigerant outlet 5.3 of the gas-liquid separator, and the lower end is connected to the compressor refrigerant inlet 1.1.

Further, the oil waste heat recovery device 11 also includes a proportional regulating valve (not shown in the figure) provided on the lubricating oil pipeline 13 connected to the lubricating oil inlet 11.3 of the oil waste heat recovery device for adjusting the flow rate of the lubricating oil.

Further, the oil waste heat recovery device 11 also includes an oil temperature sensor (not shown in the figure) for detecting the lubricating oil temperature, which is provided on the lubricating oil pipeline 13 connected to the lubricating oil outlet 11.4 of the oil waste heat recovery device.

Further, the fresh air intake device 4 includes: an intake device casing 4.1, an intake radiator 4.2 disposed in the intake device casing 4.1, and an intake fan 4.3 connected to the inner wall of the intake device casing 4.1.

Further, the fresh air exhaust device 10 includes: an exhaust device casing 10.1, an exhaust radiator 10.2 disposed in the exhaust device casing 10.1, and an exhaust fan 10.3 connected to the inner wall of the exhaust device casing 10.1.

The working principle of the carbon dioxide heat pump system with lubricating oil waste heat recovery function according to the present invention is briefly introduced below in conjunction with the accompanying drawings:

When the carbon dioxide heat pump system with lubricating oil waste heat recovery function is working, the refrigerant is compressed by the compressor 1 and becomes a refrigerant containing lubricating oil, and then enters the oil and gas separator 2, and under the action of the oil and gas separator 2, lubricating The oil remains at the bottom of the oil-gas separator 2, and the refrigerant without lubricating oil is discharged from the refrigerant outlet 2.2 of the oil-gas separator, and enters the cooler 3 to exchange heat with the heat transfer medium flowing in from the heating pipeline; The refrigerant first passes through the intake radiator 4.2 to exchange heat with the cold air entering the room, then enters the gas-liquid separator 5 and exchanges heat with the refrigerant discharged from the exhaust radiator 10.2, and passes through the gas-liquid separator 5 for cooling. The vapor contained in the refrigerant condenses into a liquid, and enters the liquid storage tank 6 together with the refrigerant. The liquid remains in the liquid storage tank 6, and the refrigerant is discharged from the liquid storage tank 6. After passing through the expansion valve 7, the refrigerant rapidly decompresses and cools down. And enter the evaporator 8. When passing through the evaporator 8, the refrigerant absorbs the heat in the outside air, and then enters the exhaust radiator 10.2, and exchanges heat with the room temperature air discharged to the outside when passing through the exhaust radiator 10.2, and the temperature rises. After passing through the gas-liquid separator 5, it exchanges heat with the refrigerant discharged from the intake radiator 4.2, the temperature further increases, and then enters the oil waste heat recovery device 11, and absorbs the heat in the high-temperature lubricating oil through the heat pipe element 11.8, and finally Back to compressor 1, and so on.

When the carbon dioxide heat pump system with lubricating oil waste heat recovery function is working, the lubricating oil in the refrigerant accumulates at the bottom of the oil and gas separator 2 under the action of the oil and gas separator 2, and when it reaches the setting of the floating ball valve inside the oil and gas separator 2, When the liquid level is fixed, the float valve is opened, and the lubricating oil leaves the oil-gas separator 2 under the action of the refrigerant pressure, enters the oil waste heat recovery device 11 for heat exchange with the refrigerant, and then returns to the compressor 1, and so on. In addition, the low-temperature refrigerant flows in the coil 12 welded on the outer wall of the oil-gas separator 2 , which can cool the oil-gas separator 2 and enhance the condensation effect of the oil-gas separator 2 .

The present invention is not limited to the above-mentioned embodiments, and any modifications, improvements, and replacements that can be conceived by those skilled in the art without departing from the essential content of the present invention fall into the protection scope of the present invention.

Claims (9)

1. The utility model provides a carbon dioxide heat pump system with lubricating oil waste heat recovery function which characterized in that, carbon dioxide heat pump system with lubricating oil waste heat recovery function includes: the system comprises a compressor (1), an oil-gas separator (2), a cooler (3), a fresh air inlet device (4), a gas-liquid separator (5), a liquid storage tank (6), an expansion valve (7), an evaporator (8), an evaporator fan (9), a fresh air exhaust device (10) and an oil waste heat recoverer (11); a compressor refrigerant outlet (1.2) on the compressor (1) is connected with an oil-gas separator refrigerant inlet (2.1) on the oil-gas separator (2) through a refrigerant pipeline, an oil-gas separator refrigerant outlet (2.2) on the oil-gas separator (2) is connected with a cooler refrigerant inlet (3.1) on the cooler (3) through a refrigerant pipeline, a cooler refrigerant outlet (3.2) on the cooler (3) is connected with a gas-liquid separator high-temperature refrigerant inlet (5.1) on the upper part of the right side of a gas-liquid separator (5) through a fresh air inlet device (4) through a refrigerant pipeline, a heat transfer medium inlet (3.3) and a heat transfer medium outlet (3.4) on the cooler (3) are respectively connected with a heating pipe, and a gas-liquid separator high-temperature refrigerant outlet (5.2) on the lower part of the right side of the gas-liquid separator (5) is connected with a liquid storage tank (6), an expansion valve (7) and a refrigerant pipeline, The evaporator (8) is connected in sequence, the evaporator (8) is connected with a gas-liquid separator low-temperature refrigerant inlet (5.4) positioned at the bottom of a gas-liquid separator (5) through a refrigerant pipeline by a fresh air exhaust device (10), an evaporator fan (9) is fixed at the top of the evaporator (8), a gas-liquid separator low-temperature refrigerant outlet (5.3) positioned at the top of the gas-liquid separator (5) is connected with an oil waste heat recoverer refrigerant inlet (11.1) at the upper part of the left side of an oil waste heat recoverer (11) through a refrigerant pipeline, an oil waste heat recoverer refrigerant outlet (11.2) positioned at the upper part of the right side of the oil waste heat recoverer (11) is connected with a compressor refrigerant inlet (1.1) at the left side of a compressor (1) through a refrigerant pipeline, an oil lubricating oil outlet (2.3) positioned at the bottom of the oil-gas separator (2) is connected with a waste heat recoverer lubricating oil inlet (11.3) on the oil waste heat recoverer (11) through a lubricating oil pipeline (13), a lubricating oil outlet (11.4) of the oil waste heat recoverer on the oil waste heat recoverer (11) is connected with a lubricating oil inlet (1.3) of the compressor at the bottom of the compressor (1) through a lubricating oil pipeline (13).

2. The carbon dioxide heat pump system with lubricating oil waste heat recovery function according to claim 1, wherein the oil waste heat recoverer (11) is a heat pipe type heat exchanger comprising: the oil waste heat recovery device comprises a recovery device upper shell (11.9) and a recovery device lower shell (11.10) connected with the bottom of the recovery device upper shell (11.9), wherein an oil waste heat recovery device partition plate (11.7) is connected with the top of the recovery device lower shell (11.10), the oil waste heat recovery device partition plate (11.7) divides an inner cavity of the oil waste heat recovery device (11) into an oil waste heat recovery device upper channel (11.5) located on the upper side of the oil waste heat recovery device partition plate (11.7) and an oil waste heat recovery device lower channel (11.6) located on the lower side of the oil waste heat recovery device partition plate (11.7), a heat pipe hole is formed in the oil waste heat recovery device partition plate (11.7), a heat pipe element (11.8) is inserted and fixed in the heat pipe hole, the upper portion of the heat pipe element (11.8) is located in the oil waste heat recovery device upper channel (11.5), and the lower portion of the oil waste heat recovery device lower channel (11.6).

3. The carbon dioxide heat pump system with the lubricating oil waste heat recovery function according to claim 1, wherein the oil-gas separator (2) is a cyclone-type oil-gas separator.

4. The carbon dioxide heat pump system with the lubricating oil waste heat recovery function according to claim 3, characterized in that a ball float valve connected with a lubricating oil outlet (2.3) of the oil-gas separator is arranged inside the oil-gas separator (2).

5. The carbon dioxide heat pump system with the lubricating oil waste heat recovery function according to claim 3, characterized in that a coil (12) is wound and fixed on the outer surface of the oil-gas separator (2), the upper end of the coil (12) is connected with a gas-liquid separator low-temperature refrigerant outlet (5.3), and the lower end of the coil is connected with a compressor refrigerant inlet (1.1).

6. The carbon dioxide heat pump system with the lubricating oil waste heat recovery function according to claim 1, wherein the oil waste heat recoverer (11) further comprises a proportional regulating valve arranged on a lubricating oil pipeline (13) connected with a lubricating oil inlet (11.3) of the oil waste heat recoverer.

7. The carbon dioxide heat pump system with the lubricating oil waste heat recovery function according to claim 6, wherein the oil waste heat recoverer (11) further comprises an oil temperature sensor arranged on a lubricating oil pipeline (13) connected with a lubricating oil outlet (11.4) of the oil waste heat recoverer.

8. The carbon dioxide heat pump system with lubricating oil waste heat recovery function according to claim 1, wherein the fresh air intake device (4) comprises: the air inlet device comprises an air inlet device shell (4.1), an air inlet radiator (4.2) arranged in the air inlet device shell (4.1) and an air inlet fan (4.3) connected with the inner wall of the air inlet device shell (4.1).

9. The carbon dioxide heat pump system with lubricating oil waste heat recovery function according to claim 1, wherein the fresh air exhaust device (10) comprises: the exhaust device comprises an exhaust device shell (10.1), an exhaust radiator (10.2) arranged in the exhaust device shell (10.1) and an exhaust fan (10.3) connected with the inner wall of the exhaust device shell (10.1).

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