CN203857622U - Air conditioning system provided with compressor and waste heat recovery and defrosting device - Google Patents

Abstract

The utility model discloses an air-conditioning system with a compressor waste heat recovery and defrosting device, which is designed to solve the problems of poor defrosting effect and the like in the existing air-conditioning system. The air conditioning system with compressor waste heat recovery defrosting device includes a compressor and an outdoor heat exchanger, and also includes a waste heat recovery defrosting device, and the waste heat recovery defrosting device includes at least one heat pipe and wraps at least a part of the compressor The shell, the heat pipe is used to transfer the heat dissipated by the compressor to the outdoor heat exchanger for defrosting. The air-conditioning system of the utility model has a high utilization rate of residual heat of the compressor, does not need to adopt auxiliary defrosting measures, and can defrost only by utilizing the residual heat emitted by the compressor, has good defrosting effect, and is energy-saving and environment-friendly.

Description

Air Conditioning System with Compressor Waste Heat Recovery and Defrost Device

technical field

The utility model relates to an air conditioning system with a compressor waste heat recovery and defrosting device.

Background technique

When the air conditioner is heating, the working medium in the outdoor heat exchanger evaporates and absorbs heat, which reduces the surface temperature of the outdoor heat exchanger. When the outdoor environment is lower than 5°C, the surface temperature of the outdoor heat Frosting occurs on the surface of the heat exchanger, which seriously affects the heating performance of the air conditioner.

There are two existing defrosting methods, one is hot gas bypass defrosting, which passes part of the high-temperature and high-pressure gas discharged from the compressor into the outdoor heat exchanger for defrosting, and the other is four-way valve reversing defrosting. When defrosting is required, the four-way valve is switched from the heating state to the cooling state, and the outdoor heat exchanger is converted into a condenser for defrosting. The former method needs to divert part of the heat in the exhaust of the compressor, which affects the heating performance of the air conditioner, and the defrosting time is long and the defrosting effect is poor; the latter method completely suspends the heat supply to the room during the defrosting period, and also Need to absorb heat from the room for defrosting, seriously affecting the comfort of the room.

Utility model content

The purpose of the utility model is to propose an air conditioning system with a compressor waste heat recovery and defrosting device with high utilization rate of compressor waste heat, energy saving and environmental protection, and good defrosting effect.

For this purpose, the utility model adopts the following technical solutions:

An air conditioning system with a compressor waste heat recovery defrosting device, including a compressor and an outdoor heat exchanger, and a waste heat recovery defrosting device, the waste heat recovery defrosting device includes at least one heat pipe and wraps the compressor at least part of the shell,

The heat pipe is used to transfer the heat dissipated by the compressor to the outdoor heat exchanger for defrosting.

Preferably, the heat pipe includes a heat pipe evaporating section connected to the shell, a heat pipe condensing section arranged in the outdoor heat exchanger, and a heat pipe insulation section connecting the heat pipe evaporating section and the heat pipe condensing section, and the heat pipe has residual heat Recycling working fluid.

Preferably, the shell is made of heat-conducting material, and the heat pipe evaporation section is penetrated in the shell or arranged outside the shell or

The shell is made of thermal insulation material, and the evaporation section of the heat pipe is arranged between the shell and the compressor.

Preferably, the waste heat recovery defrosting device has a plurality of heat pipes, and the plurality of heat pipe evaporation sections of the plurality of heat pipes are evenly distributed on the outer periphery of the compressor along the circumferential direction.

Preferably, the condensation section of the heat pipe is parallel to the heat transfer pipe of the outdoor heat exchanger;

The condensing section of the heat pipe has fins, and the fins of the condensing section of the heat pipe are coupled with the fins of the outdoor heat exchanger.

Preferably, one side of the outdoor heat exchanger is provided with an axial flow fan, and the axial flow fan and the condensation section of the heat pipe are respectively located on both sides of the heat transfer pipe of the outdoor heat exchanger.

Preferably, there are multiple compressors connected in parallel in the refrigeration/heating cycle, and each compressor is provided with a shell and a heat pipe evaporating section on the outside.

Preferably, the shell is a hollow cylindrical aluminum sleeve.

Preferably, the outer side of the thermal insulation section of the heat pipe is wrapped with an insulating layer.

Preferably, the inner wall of the heat pipe is filled with a capillary wick;

Preferably, the material of the capillary liquid-absorbing core is wire mesh, sintered metal and/or foamed metal.

The beneficial effects of the utility model are:

(1) The waste heat recovery and defrosting device of the air conditioning system with compressor waste heat recovery and defrosting device of the utility model includes at least one heat pipe and a shell covering at least a part of the compressor. The heat pipe transmits the heat emitted by the compressor to the outdoor heat exchanger For defrosting, the shell can play a role of heat preservation or heat conduction for the compressor, so that the heat pipe can absorb most of the heat emitted by the compressor, and the utilization rate of waste heat is high. There is no need to use auxiliary defrosting measures, and only the waste heat emitted by the compressor is used. Can carry out defrosting, good defrosting effect, energy saving and environmental protection;

(2) The heat pipe is placed close to or close to the shell, and the insulation layer is wrapped on the outside of the heat pipe insulation section, which further improves the utilization rate of the waste heat of the compressor, reduces heat loss, and achieves a good defrosting effect.

Description of drawings

Fig. 1 is a structural schematic diagram of an air conditioning system provided with a compressor waste heat recovery defrosting device provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of the assembly structure of the air conditioning system compressor, shell and heat pipe evaporation section provided by Embodiment 1 of the utility model with a compressor waste heat recovery and defrosting device;

Fig. 3 is a structural schematic diagram of the heat pipe of the air conditioning system provided by Embodiment 1 of the utility model with a compressor waste heat recovery defrosting device;

Fig. 4 is a schematic diagram of the flow direction of the working medium when the air conditioning system with the compressor waste heat recovery defrosting device provided by Embodiment 1 of the present utility model performs the defrosting operation of the heat pipe;

Fig. 5 is a comparison diagram of the temperature entropy diagram when the air-conditioning system with the compressor waste heat recovery defrosting device provided by Embodiment 1 of the utility model is running and the air conditioning system without the compressor waste heat recovery defrosting device is running;

Fig. 6 is a schematic diagram of the flow of working fluid during normal refrigeration of the air conditioning system provided with the compressor waste heat recovery and defrosting device provided by Embodiment 1 of the present utility model.

In the figure, 1. Compressor; 2. Oil separator; 3. First one-way valve; 4. Four-way reversing valve; 5. Outdoor heat exchanger; 6. Outdoor electronic expansion valve; 7. Second one-way valve Valve; 8. High-pressure liquid receiver; 9. Liquid pipe shut-off valve; 10. Indoor electronic expansion valve; 11. Indoor heat exchanger; 12. Air pipe shut-off valve; 13. Gas-liquid separator; 14. Heat pipe; 141. Heat pipe Evaporation section; 142, heat pipe insulation section; 143, heat pipe condensation section; 144, capillary heat-absorbing core; 15, shell; 16, axial flow fan.

Detailed ways

The technical scheme of the utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

Embodiment one:

1 to 3 are structural schematic diagrams of an air conditioning system with a compressor waste heat recovery device provided in this embodiment. As shown in the figure, the air conditioning system includes a gas-liquid separator 13, a compressor 1, an oil separator 2, a four-way reversing valve 4, an outdoor heat exchanger 5, an outdoor electronic expansion valve 6, a high-pressure liquid reservoir 8, The indoor electronic expansion valve 10 and the indoor heat exchanger 11 are connected to the cooling/heating cycle and the waste heat recovery defrosting device through pipelines. A gas pipe cut-off valve 12 is provided between the high pressure liquid reservoir 8 and the indoor electronic expansion valve 10 , and a liquid pipe stop valve 9 is provided between the four-way reversing valve 4 and the indoor heat exchanger 11 . A first one-way valve is set between the oil separator 2 and the four-air reversing valve 4 , and a second one-way valve 7 is connected in parallel with the outdoor electronic expansion valve 6 .

The compressor waste heat recovery device includes five heat pipes 14 and a casing 15 covering at least a part of the compressor 1 and covering the outside of the compressor 1 . As shown in FIG. 3 , each heat pipe 14 includes a heat pipe evaporating section 141 connected to the shell 15, a heat pipe condensing section 143 arranged in the outdoor heat exchanger 5, and a heat-insulated heat pipe connecting the heat pipe evaporating section 141 and the heat pipe condensing section 143. Paragraph 142. As shown in FIG. 2 , the heat pipe evaporating sections 141 of the five heat pipes 14 are all penetrated in the shell 15 and evenly distributed on the outer periphery of the compressor 1 along the circumferential direction. The shell 15 is made of heat-conducting material. In this embodiment, a hollow cylindrical aluminum sleeve is used, which has a good heat-conducting effect. The heat pipe condensing section 143 is parallel to the heat transfer tube of the outdoor heat exchanger 5 , and the heat pipe condensing section 143 has fins coupled with the fins of the outdoor heat exchanger 5 . In order to reduce heat loss, an insulation layer is wrapped on the outside of the heat pipe insulation section 142 . The inner wall of the heat pipe 14 is filled with a capillary wick 144 whose material can be wire mesh, sintered metal and/or foamed metal. The heat pipe 14 has waste heat recovery working fluid inside.

One side of the outdoor heat exchanger 5 is provided with an axial flow fan 16 , and the axial flow fan 16 and the heat pipe condensation section 143 are respectively located on both sides of the heat transfer tube of the outdoor heat exchanger 5 .

The air conditioning system can perform three operating modes: normal heating operation, normal cooling operation and heat pipe defrosting operation. During normal heating operation, the four-way reversing valve 4 is powered on, the outdoor electronic expansion valve 6 operates normally, the indoor electronic expansion valve 10 is fully opened, the axial flow fan 16 rotates forward, and the flow direction of the heat exchange working medium is compressor 1- Oil separator 2-first one-way valve 3-four-way reversing valve 4-air pipe cut-off valve 12-indoor heat exchanger 11-indoor electronic expansion valve 10-liquid pipe stop valve 9-high pressure reservoir 8-outdoor electronics Expansion valve 6-outdoor heat exchanger 5-gas-liquid separator 13-compressor 1.

As shown in Figure 4, when it is detected that the outdoor heat exchanger 5 needs to be defrosted, it enters the heat pipe defrosting operation, and the liquid waste heat recovery working medium absorbs the heat emitted by the compressor 1 in the heat pipe evaporating section 141 and evaporates into a gaseous state. A pressure difference is formed between the heat pipe evaporating section 141 and the heat pipe condensing section 143, and the gaseous waste heat recovery working fluid flows through the heat pipe insulation section 142 to the heat pipe condensing section 143 under the action of the pressure difference and releases heat and turns back to a liquid state. The mass flows back to the heat pipe evaporating section 141 driven by capillary force, so that the waste heat dissipated by the compressor 1 is continuously provided to the outdoor heat exchanger 5 continuously. The flow direction of the heat exchange working fluid is the same as that in normal heating operation, the difference is that the axial flow fan 16 runs in reverse, so that the outdoor air first absorbs heat through the heat pipe condensation section 143, and then the heated outdoor air flows through the outdoor heat exchanger. Heater 5, like this, hot air can remove the frost that outdoor heat exchanger 5 forms.

As shown in Figure 6, during normal cooling operation, the four-way reversing valve 4 is not powered on, the outdoor electronic expansion valve 6 is fully open, the indoor electronic expansion valve 10 is operating normally, and the flow direction of the heat exchange working medium is compressor 1-oil separation Device 2-first one-way valve 3-four-way reversing valve 4-outdoor heat exchanger 5-second one-way valve 7-high pressure liquid receiver 8-liquid pipe stop valve 9-indoor electronic expansion valve 10-indoor heat exchanger Heater 11-air pipe stop valve 12-gas-liquid separator 13-compressor 1. During cooling, the average temperature of the outdoor heat exchanger 5 is about 50°C, and the temperature difference between the shell of the compressor 1 and the compressor 1 is much smaller than that in winter. The influence of temperature, to minimize the impact on refrigeration performance.

Fig. 5 is a comparison diagram of temperature entropy diagrams of the air conditioning system with the waste heat recovery defrosting device of the compressor in operation and the air conditioning system without the waste heat recovery defrosting device of the compressor in operation in this embodiment. The positions represented by a, a', b, b', c, d, and d' are shown in Figure 4. Pk is the condensation pressure, P0' is the evaporation pressure under the action of the heat pipe 14, and P0 is the evaporation pressure under the action of no heat pipe. The compressor 1 at point a sucks the gaseous refrigerant in a saturated state after heat exchange from the outdoor heat exchanger 5, and the compressor 1 is compressed and exhausted to state point b, the refrigerant passes through the indoor heat exchanger 11 and becomes state point c with a certain degree of subcooling, and the refrigerant in the supercooled state becomes a two-phase state through throttling and depressurization of the outdoor electronic expansion valve 6, The heat absorption in the outdoor heat exchanger 5 becomes the suction state point d of the compressor 1, a-b-c-d-a is the temperature-entropy diagram during heat operation without a heat pipe, and a'-b'-c-d'-a' is the temperature-entropy diagram with a heat pipe 14 The temperature entropy diagram during heating operation, it can be seen from the figure that under the condition of constant subcooling degree and condensation pressure, the heat delivered by the heat pipe 14 to the outdoor heat exchanger 5 can make the evaporation pressure change from P0 to P0', reducing The small compressor 1 power Δω effectively improves the heating stability of the air conditioner.

In this embodiment, the waste heat recovery defrosting device of the air-conditioning system with compressor waste heat recovery defrosting device includes a heat pipe and a shell set outside the compressor. The heat pipe transmits the heat emitted by the compressor to the outdoor heat exchanger for defrosting. The shell can It plays the role of heat preservation or heat conduction for the compressor, so that the heat pipe can absorb most of the heat emitted by the compressor, and the waste heat utilization rate is high. There is no need to use auxiliary defrosting measures, and only the waste heat emitted by the compressor can be used for defrosting. The cream effect is good, energy saving and environmental protection.

In order to improve the performance of the air-conditioning system, multiple compressors connected in parallel can be arranged, and a casing and a heat pipe evaporation section are arranged outside each compressor. The evaporating section of the heat pipe is not limited to be installed in the shell, but can also be set outside the shell, or the shell is made of insulation material, and the evaporating section of the heat pipe is set between the shell and the compressor, which can absorb the waste heat emitted by the compressor as much as possible. . The number of heat pipes is not limited to five, and can be set according to specific needs.

The technical principles of the present utility model have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the utility model, and cannot be construed as limiting the protection scope of the utility model in any way. Based on the explanations herein, those skilled in the art can think of other specific implementations of the present utility model without creative work, and these forms will all fall within the protection scope of the present utility model.

Claims (10)

1. one kind has the air-conditioning system of heat of compressor recovery defroster, comprise compressor (1) and outdoor heat exchanger (5), it is characterized in that: also comprise waste heat recovery defroster, described waste heat recovery defroster comprises at least one heat pipe (14) and wraps up the shell (15) of described compressor (1) at least a portion

Described heat pipe (14) transfers to outdoor heat exchanger (5) for the heat that described compressor (1) is distributed and defrosts.

2. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 1, it is characterized in that: described heat pipe (14) comprises the heat pipe evaporator section (141) that is connected with described shell (15), be arranged at the heat pipe condenser section (143) in described outdoor heat exchanger (5) and connect the heat pipe adiabatic section (142) of heat pipe evaporator section (141) and heat pipe condenser section (143), and described heat pipe has waste heat recovery working medium in (14).

3. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 2, it is characterized in that: described shell (15) is Heat Conduction Material, described heat pipe evaporator section (141) be arranged in described shell (15) or be arranged at described shell (15) outside or

Described shell (15) is insulation material, and described heat pipe evaporator section (141) is arranged between described shell (15) and described compressor (1).

4. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 3, it is characterized in that: described waste heat recovery defroster has many heat pipes (14), multiple heat pipe evaporator sections (141) of described many heat pipes (14) are along the circumferential direction distributed in the periphery of described compressor (1).

5. according to a kind of air-conditioning system with heat of compressor recovery defroster described in claim 2 to 4 any one, it is characterized in that: described heat pipe condenser section (143) is parallel with the heat-transfer pipe of described outdoor heat exchanger (5);

Described heat pipe condenser section (143) is with fin, and the fin of the fin of described heat pipe condenser section (143) and described outdoor heat exchanger (5) is coupled.

6. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 5, it is characterized in that: a side of described outdoor heat exchanger (5) is provided with aerofoil fan (16), described aerofoil fan (16) and described heat pipe condenser section (143) lay respectively at the both sides of the heat-transfer pipe of described outdoor heat exchanger (5).

7. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 2, it is characterized in that: in the refrigerating/heating closed circuit of described air-conditioning system, have the compressor (1) of multiple parallel connections, the outside of each compressor (1) is provided with shell (15) and heat pipe evaporator section (141).

8. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 7, is characterized in that: described shell (15) is hollow cylindrical aluminium cover.

9. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 2, is characterized in that: the outside of described heat pipe adiabatic section (142) is enclosed with heat-insulation layer.

10. a kind of air-conditioning system with heat of compressor recovery defroster according to claim 1, is characterized in that: the inwall of described heat pipe (14) is filled with capillary wick (144).