TW201420980A - Refrigeration and air condition system - Google Patents

Abstract

A refrigeration and air condition system includes a coolant circulation module and a defrosting control valve. The coolant cycle module includes a compressor, a condenser, an expansion device, and an evaporator. The compressor, the condenser, the expansion device, and the evaporator are connected in series via a tube to form a circulation. The defrosting control valve is connected to expansion device in parallel and is connected between the expansion device and the condenser.

Description

Refrigerated air conditioning system

This proposal relates to a refrigerated air conditioning system, in particular a refrigerated air conditioning system with defrosting or heat exchange functions.

At present, the defrosting means of most refrigerating air-conditioning systems (such as refrigerators or air-conditioning equipment) adopts a method of electric heating defrosting, but the method of electric defrosting will easily cause a problem of high power consumption. Take the freezer in the store for high-quality goods. If the freezer uses electric defrosting, it will easily cause the temperature of the freezer to be too high. This often causes problems such as variations in the quality of food or meat in the freezer, deterioration, and blackening. Therefore, when a general store wants to defrost a freezer, it is often necessary to remove the food or meat in the freezer to defrost. As such, the defrosting process will be too lengthy and inconvenient.

In addition, the defrosting means of the refrigerating and air-conditioning system adopts the method of hot gas defrosting or hydrothermal defrosting, but the hot defrosting method will easily cause the negative impact of thermal shock, and the method of hydrothermal defrosting will cause The low ambient temperature causes the defrosting temperature to be too low. Moreover, the above method of hot gas defrosting or hydrothermal defrosting must also be combined with the electric heating means of the liquid-gas separator in the refrigerating air-conditioning system to prevent the problem of compressor fluid generation, so the hot gas is defrosted or hydrothermally removed. The way the frost still needs to consume extra power.

In addition, at present, the refrigerating and air-conditioning system often has waste heat generated, and this waste heat will also cause waste of energy utilization of the refrigerating and air-conditioning system.

The proposal is to provide a refrigerating air conditioning system that solves the problems of conventional defrost means and improves energy efficiency.

The refrigerating and air conditioning system disclosed in the proposal includes a refrigerant circulation module and a defrost control valve. The refrigerant circulation module comprises a compressor, a condenser, an expansion device and an evaporator. The compressor, the condenser, the expansion device and the evaporator are connected in sequence through a pipeline to form a circulation loop. The defrosting control valve and the expansion device are connected in parallel between the evaporator and the condenser.

The refrigerating and air-conditioning system disclosed in the proposal includes a refrigerant circulation module and a heat recovery module. The refrigerant circulation module comprises a compressor, a condenser, an expansion device and an evaporator. The compressor, the condenser, the expansion device and the evaporator are connected in sequence through a pipeline to form a circulation loop. The heat recovery module contains a first-class controller and a heat recovery unit. The flow direction controller is connected between the compressor and the condenser. One end of the heat recovery unit is connected to the flow controller, and the other end of the heat recovery unit is connected to the line between the condenser and the expansion valve.

According to the refrigerating and air-conditioning system disclosed in the above proposal, the high-temperature refrigerant to the evaporator is introduced by the relationship between the defrosting control valve and the expansion device in parallel configuration to achieve the defrosting effect. In addition, the defrosting effect is enhanced by the setting of the defrosting auxiliary module. Therefore, the refrigerating and air-conditioning system of the present embodiment can quickly complete the defrosting action and can avoid the problems of thermal shock and additional power consumption. In addition, by the setting of the heat recovery module, the waste heat generated by the refrigerating and air-conditioning system can be fully recovered to improve energy reuse.

The features, implementation and efficacy of this proposal are described in detail below with reference to the preferred embodiment of the drawings.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a structural configuration diagram of a refrigerating and air-conditioning system according to an embodiment of the present proposal, and FIG. 2 is a superheat adjustment module of the refrigerating and air-conditioning system according to FIG. 1 . Schematic.

The refrigerating and air-conditioning system 10 of the present embodiment can be applied to a refrigerator or an air conditioner, but is not limited thereto.

The refrigerating and air conditioning system 10 includes a refrigerant circulation module 11 and a defrost control valve 116.

The refrigerant circulation module 11 includes a compressor 111, a condenser 112, an expansion device 113, and an evaporator 114. The compressor 111, the condenser 112, the expansion device 113, and the evaporator 114 are sequentially connected through a line 115 to constitute a circulation loop. Further, the refrigerant in the refrigerant circulation module 11 can pass through the pipeline 115 and sequentially flow through the condenser 111, the expansion device 113, and the evaporator 114 from the compressor 111, and then the refrigerant passes through the pipeline 115 and is passed through the evaporator 114. The flow is returned to the compressor 111 to complete a single refrigerant cycle. Wherein, the expansion device 113 may be, but not limited to, an expansion valve or a capillary tube.

The defrosting control valve 116 is connected between the evaporator 114 and the condenser 112, and the defrosting control valve 116 and the expansion device 113 are in a parallel configuration. When the evaporator 114 is to be defrosted, the defrosting control valve 116 can be opened. Thus, a part of the high-temperature liquid refrigerant discharged from the condenser 112 can directly flow into the evaporator 114 via the defrosting control valve 116 without passing through the expansion device 113, so that the high-temperature liquid refrigerant heats the evaporator 114 to perform defrosting. .

In addition, if the ambient temperature is too low or the load of the refrigerating and air-conditioning system is low, the temperature of the high-temperature liquid refrigerant discharged from the condenser 112 is not high enough, which will cause condensation. The high-temperature liquid refrigerant discharged from the device 112 cannot sufficiently defrost the evaporator 114, thereby affecting the defrosting efficiency. In this regard, the refrigerating and air conditioning system 10 of the present proposal further includes a defrosting auxiliary module 12 to enhance the defrosting effect.

The defrosting auxiliary module 12 of the embodiment includes a first valve body 121, a second valve body 122, a third valve body 123, a first flow tube 124, a second flow tube 125, and a bypass tube 126. A first temperature sensor 127 and a heat exchanger 128.

One end of the first valve body 121 is connected to the compressor 111 through the first flow tube 124, and the other end of the first valve body 121 is connected to the defrosting control valve 116 through the second flow tube 125. In this manner, the high temperature gaseous refrigerant discharged from the compressor 111 can pass directly through the first valve body 121 to the defrosting control valve 116.

The first temperature sensor 127 is located in the pipeline 115 and adjacent to the defrosting control valve 116 , and the first temperature sensor 127 is electrically connected to the first valve body 121 .

The heat exchanger 128 is located in the second flow tube 125, and the heat exchanger 128 is interposed between the first valve body 121 and the defrosting control valve 116. The bypass pipe 126 is connected between the first valve body 121 and the defrosting control valve 116, and the bypass pipe 126 and the second flow pipe 125 are arranged in parallel. The second valve body 122 is located between the heat exchanger 128 and the first valve body 121 and the third valve body 123 is disposed at the bypass pipe 126. In addition, the heat exchanger 128 can be connected to a frame or a water tray of the equipment used by the refrigerating and air-conditioning system 10 through a heat pipe. Moreover, the first valve body 121 and the first temperature sensor 127 together constitute a temperature control valve module, and the second valve body 122 and the third valve body 123 may be a temperature control valve itself, but not This is limited to this.

Therefore, when the first temperature sensor 127 senses that the temperature of the high temperature liquid refrigerant discharged from the condenser 112 to the defrosting control valve 116 is not high enough, the first valve body 121 is Can be turned on automatically. Thus, the high-temperature gaseous refrigerant discharged from the compressor 111 passes through the first valve body 121 to reach the second flow tube 125 and the bypass tube 126. At this time, the second valve body 122 and the third valve body 123 are opened or closed according to the temperature of the high-temperature gaseous refrigerant.

In detail, if the temperature of the high-temperature gaseous refrigerant is too high and may cause thermal shock to the evaporator, the second valve body 122 is opened and the third valve body 123 is closed. In this way, the high temperature gaseous refrigerant will first pass through the heat exchanger 128 to heat the defrosting, dehumidifying or anti-condensation of the frame or the water tray of the equipment used in the refrigerating and air-conditioning system 10, so that the temperature of the high-temperature gaseous refrigerant can be lowered before passing. The defrosting control valve 116 enters the evaporator 114 for auxiliary heating defrosting to avoid a negative impact on the thermal shock of the evaporator 114.

If the temperature of the high temperature gaseous refrigerant is appropriate without causing thermal shock to the evaporator 114, the second valve body 122 will close and the third valve body 123 will open. Thus, the high temperature gaseous refrigerant can enter the evaporator 114 directly through the defrosting control valve 116 for auxiliary heating defrosting to enhance the defrosting effect.

Moreover, the refrigerating and air-conditioning system 10 of the present proposal uses the design of the defrosting control valve 116 and the defrosting auxiliary module 12 to perform the defrosting test on the actual freezer, and the actual measurement of the freezer takes only 11.34 minutes. Defrost can be used to meet your needs. Compared with the conventional method of electric defrosting, it is necessary to perform a defrosting operation for 30 minutes every 4 hours, and the defrosting means of the refrigerating and air-conditioning system 10 of the present proposal can significantly reduce the defrosting time. In addition, the defrosting means of the refrigerating and air-conditioning system 10 of the present proposal does not require additional power, so that energy saving effects can be achieved.

In addition, in this embodiment, a part of the high-temperature liquid refrigerant discharged from the condenser 112 is introduced into the evaporator 114 for defrosting, and if the liquid refrigerant passes through the evaporator 114, Being completely vaporized may cause the compressor 111 to generate a problem of liquid compression causing the link or the valve piece inside the compressor 111 to break. In this regard, the refrigerating and air conditioning system 10 of the present proposal further includes a superheat adjustment module 14 to prevent the compressor 111 from generating a problem of liquid compression.

The superheat adjustment module 14 of the embodiment includes an outer cavity 141, an inner cavity 142, a first pipe body 143, a second pipe body 144, a third pipe body 145 and a fourth pipe body 146. . The outer chamber 141 has an outer chamber 1411, the inner chamber 142 is located in the outer chamber 1411 in the outer chamber 141, and the inner chamber 142 has an inner chamber 1421. The outer chamber 1411 communicates with a line 115 between the condenser 112 and the expansion device 113, and the inner chamber 1421 communicates with the line 115 between the compressor 111 and the evaporator 114.

In detail, the first tube body 143 and the second tube body 144 are connected to the outer chamber body 141 and communicate with the outer chamber 1411, and one end of the first tube body 143 away from the outer chamber body 141 is connected to the condenser 112 through the pipeline 115. The end of the second pipe body 144 away from the outer cavity body 141 is connected to the expansion device 113 through the pipe 115. Thereby, the refrigerant discharged from the condenser 112 passes through the outer chamber 1411 before reaching the expansion device 113. The third tube body 145 and the fourth tube body 146 are connected to the inner cavity 142 and communicate with the inner chamber 1421, and the third tube body 145 is connected to the compressor 111 through the pipeline 115 from the end of the inner cavity 142. The end of the tubular body 146 away from the inner cavity 142 is connected to the evaporator 114 through the conduit 115. Thereby, the refrigerant discharged from the evaporator 114 passes through the inner chamber 1421 before reaching the compressor 111.

In addition, the relative height of the opening 1431 of the first tubular body 143 in the outer chamber 1411 is greater than the relative height of the opening 1441 of the second tubular body 144 located in the outer chamber 1411. In detail, the opening 1431 of the first pipe body 143 to the bottom of the outer chamber 1411 The distance of 1412 is greater than the distance from the opening 1441 of the second tubular body 144 to the bottom 1412 of the outer chamber 1411.

Moreover, the third tube body 145 is a U-shaped tube, and the relative height of the opening 1451 in the inner chamber 1421 is greater than the relative height of the opening 1461 of the fourth tube body 146 in the inner chamber 1421. In detail, the distance from the opening 1451 of the third tubular body 145 to the bottom portion 1422 of the inner chamber 1421 is greater than the distance from the opening 1461 of the fourth tubular body 146 to the bottom portion 1422 of the inner chamber 1421.

When the refrigerant circulates, the liquid refrigerant 20 discharged from the condenser 112 is accumulated in the outer chamber 1411, and the liquid refrigerant 20' discharged from the evaporator 114 is accumulated in the inner chamber 1421, and the outer chamber 1411 The temperature of the liquid refrigerant 20 in the interior is higher than the temperature of the liquid refrigerant 20' in the inner chamber 1421. Thus, the liquid refrigerant 20' in the inner chamber 1421 is exchanged with the liquid refrigerant 20 in the outer chamber 1411 to evaporate into a gaseous refrigerant, and then discharged to the compressor 111 via the third tube 145. Further, since the relative height of the opening 1451 of the third pipe body 145 is larger than the relative height of the opening 1461 of the fourth pipe body 146, it is ensured that the refrigerant discharged from the inner chamber 1421 to the compressor 111 is a gaseous refrigerant. Thereby, the problem that the compressor 111 generates liquid compression can be prevented. As the relative height of the opening 1431 of the first pipe body 143 is greater than the relative height of the opening 1441 of the second pipe body 144, it is ensured that the refrigerant flowing out to the expansion device 113 is a liquid refrigerant.

In addition, the refrigerating and air-conditioning system 10 of the present embodiment may further include a heat recovery module 13 for recovering waste heat generated by the refrigerating and air-conditioning system 10 to improve energy reuse.

The heat recovery module 13 includes a first-class controller 131, a heat recovery unit 132, a liquid storage unit 134, and a second temperature sensor 135. The flow direction controller 131 is connected to the pressure Between the compressor 111 and the condenser 112. One end of the heat recovery unit 132 is connected to the flow controller 131, and the other end of the heat recovery unit 132 is connected to the line 115 between the condenser 112 and the expansion device 113. The liquid storage device 134 is coupled to the heat recovery unit 132, and the liquid storage unit 134 can be, but is not limited to, a water storage tank or a water storage tower. The second temperature sensor 135 is located in the liquid storage device 134, and the second temperature sensor 135 is configured to detect the temperature of the liquid (eg, water) in the liquid storage device 134. Moreover, the second temperature sensor 135 is electrically connected to the controller 131.

The high-temperature refrigerant discharged from the compressor 111 can flow to the heat recovery unit 132 via the flow to the controller 131, and the heat recovery unit 132 absorbs the heat energy of the high-temperature gaseous refrigerant to heat the liquid in the liquid storage unit 134. Moreover, the flow direction controller 131 generally conducts all the high-temperature refrigerant discharged from the compressor 111 to the heat recovery unit 132 as much as possible, so that the heat recovery unit 132 sufficiently absorbs the heat energy of the high-temperature gaseous refrigerant discharged from the compressor 111. Avoid waste of waste heat. When the second temperature sensor 135 detects that the temperature of the liquid (eg, water) in the liquid storage device 134 reaches the set demand, the flow direction controller 131 switches the flow of the refrigerant from the heat recovery unit 132 to the condenser 112. In this way, the recovery efficiency of the heat recovery unit 132 can be improved, and the temperature of the high temperature liquid (such as hot water) provided by the liquid storage unit 134 can be maintained at an optimum temperature.

In addition, in this embodiment, the heat recovery module 13 further includes a pressure relief valve 133, one end of the pressure relief valve 133 is connected to the flow direction controller 131, and the other end of the pressure relief valve 133 is connected to the compressor 111 and the evaporator. Line 115 between 114. Thereby, when the flow to the controller 131 switches the flow direction of the refrigerant, part of the refrigerant can be returned to the compressor 111, so that the flow of the refrigerant flowing to the heat recovery unit 132 or the condenser 112 caused by the flow to the controller 131 during the switching process can be prevented. The negative impact of the increase.

Please refer to FIG. 3, which is a structural configuration diagram of a refrigerating and air-conditioning system according to another embodiment of the present proposal. Since this embodiment is similar to the embodiment of Fig. 1, only the differences will be explained.

The difference between the embodiment and the first embodiment is that the defrosting auxiliary module 12a of the refrigerating and air-conditioning system 10 of the present embodiment does not have a second valve body 122, a third valve body 123, and a bypass pipe 126.

Therefore, the high-temperature gaseous refrigerant discharged from the compressor 111 passes through the first valve body 121 and the heat exchanger 128 in sequence, and then enters the evaporator 114 through the defrosting control valve 116 to perform auxiliary heating defrosting to enhance the defrosting effect. . The refrigerating and air-conditioning system 10 of the above embodiment can still achieve the effect of rapid defrosting.

Please refer to FIG. 4, which is a structural configuration diagram of a refrigerating and air-conditioning system according to still another embodiment of the present proposal. Since this embodiment is similar to the embodiment of Fig. 1, only the differences will be explained.

The refrigerating and air-conditioning system 10b of the present embodiment further includes a flow divider 119, an auxiliary heat exchanger 117, and a bypass line 118. The flow divider 119 is located in the line 115 between the expansion device 113 and the evaporator 114. The flow splitter 119 can be, but is not limited to, a control valve, a throttle valve, or a combination of a control valve and a throttle valve.

One end of the branch line 118 is connected to the flow divider 119, and the other end of the branch line 118 is connected to the line 115 between the evaporator 114 and the compressor 111 (especially may be connected to the evaporator 114 and the superheat adjustment module 14). Between the lines 115). The auxiliary heat exchanger 117 is located on the branch line 118, and the auxiliary heat exchanger 117 may be disposed outside, but not limited thereto.

When the refrigerating and air conditioning system 10b does not need to provide a load of freezing or cold air, steaming The generator 114 is turned off, and all of the refrigerant flows to the auxiliary heat exchanger 117 for heat exchange by the flow divider 119 to maintain the continuous operation of the compressor 111. In this way, the heat recovery module 13 can continuously recover the heat energy of the refrigerant to ensure that the temperature of the high temperature liquid (such as hot water) provided by the liquid storage device 134 can maintain the optimum temperature.

When the load of the refrigerating and air-conditioning system 10b for freezing or cold air is at a full load, the auxiliary heat exchanger 117 is turned off and all of the refrigerant flows to the evaporator 114 by the flow divider 119.

When the load of the refrigerating and air-conditioning system 10b for freezing or cold air is a low load, the flow ratio of the refrigerant flowing to the evaporator 114 and the auxiliary heat exchanger 117 is appropriately adjusted by the flow divider 119 to simultaneously satisfy the demand for freezing or cooling air and The continuous operation of the heat recovery module 13.

According to the refrigerating and air-conditioning system of the above embodiment, the high-temperature refrigerant to the evaporator is introduced by the relationship between the defrosting control valve and the expansion device in parallel configuration to achieve the defrosting effect. Moreover, the refrigerating and air-conditioning system of the present embodiment can quickly complete the defrosting action and can avoid the problems of thermal shock and additional power consumption. In addition, the defrosting effect is enhanced by the setting of the defrosting auxiliary module. By the setting of the superheat adjustment module, the problem of liquid compression of the compressor is prevented. The energy recovery rate is improved by fully recovering the waste heat generated by the refrigerating and air-conditioning system by setting the heat recovery module.

While the present invention has been disclosed in the foregoing preferred embodiments, it is not intended to limit the present invention. Any skilled person skilled in the art can make some changes and refinements without departing from the spirit and scope of the present proposal. The scope of patent protection of the proposal shall be subject to the definition of the scope of the patent application attached to this specification.

10‧‧‧Refrigeration system

10a‧‧‧Refrigeration system

11‧‧‧Refrigerant circulation module

111‧‧‧Compressor

112‧‧‧Condenser

113‧‧‧Expansion device

114‧‧‧Evaporator

115‧‧‧pipe

116‧‧‧Defrost control valve

117‧‧‧Auxiliary heat exchanger

118‧‧‧Drainage line

119‧‧‧Splitter

12‧‧‧Defrost assist module

12a‧‧‧Defrost assist module

121‧‧‧First valve body

122‧‧‧Second body

123‧‧‧ third valve body

124‧‧‧First flow tube

125‧‧‧Second flow tube

126‧‧‧bypass

127‧‧‧First temperature sensor

128‧‧‧ heat exchanger

13‧‧‧heat recovery module

131‧‧‧Flow controller

132‧‧‧heat recovery

133‧‧‧pressure relief valve

134‧‧‧Liquid storage device

135‧‧‧Second temperature sensor

14‧‧‧Superheat adjustment module

141‧‧‧External cavity

1411‧‧‧External chamber

1412‧‧‧ bottom

142‧‧‧ internal cavity

1421‧‧‧ inner chamber

1422‧‧‧ bottom

143‧‧‧First tube

1431‧‧‧ openings

144‧‧‧Second body

1441‧‧‧ openings

145‧‧‧3rd body

1451‧‧‧ openings

146‧‧‧fourth body

1461‧‧‧ openings

20‧‧‧Liquid refrigerant

20’‧‧‧Liquid refrigerant

Fig. 1 is a structural configuration diagram of a refrigerating and air-conditioning system according to an embodiment of the present proposal.

Fig. 2 is a schematic view showing the structure of a superheat adjustment module of the refrigerating and air-conditioning system according to Fig. 1.

Fig. 3 is a structural configuration diagram of a refrigerating and air-conditioning system according to another embodiment of the present proposal.

Fig. 4 is a structural configuration diagram of a refrigerating and air-conditioning system according to still another embodiment of the present proposal.

10‧‧‧Refrigeration system

11‧‧‧Refrigerant circulation module

111‧‧‧Compressor

112‧‧‧Condenser

113‧‧‧Expansion device

114‧‧‧Evaporator

115‧‧‧pipe

116‧‧‧Defrost control valve

12‧‧‧Defrost assist module

121‧‧‧First valve body

122‧‧‧Second body

123‧‧‧ third valve body

124‧‧‧First flow tube

125‧‧‧Second flow tube

126‧‧‧bypass

127‧‧‧First temperature sensor

128‧‧‧ heat exchanger

13‧‧‧heat recovery module

131‧‧‧Flow controller

132‧‧‧heat recovery

133‧‧‧pressure relief valve

134‧‧‧Liquid storage device

135‧‧‧Second temperature sensor

14‧‧‧Superheat adjustment module

Claims (24)

A refrigerating air conditioning system comprising: a refrigerant circulation module comprising a compressor, a condenser, an expansion device and an evaporator, the compressor, the condenser, the expansion device and the evaporator passing through a pipeline Connected sequentially to form a circulation loop; and a defrost control valve is coupled between the evaporator and the condenser in a parallel configuration with the expansion device. The refrigerating and air-conditioning system of claim 1, further comprising a defrosting auxiliary module, comprising a first valve body and a first temperature sensor, wherein the opposite ends of the first valve body are respectively connected to the compressor and The defrosting control valve is located at the pipeline and adjacent to the defrosting control valve, and the first temperature sensor is electrically connected to the first valve body. The refrigerating and air-conditioning system of claim 2, wherein the defrosting auxiliary module further comprises a first flow tube, a second flow tube and a heat exchanger, wherein the first valve body is connected to the compressor through the first flow tube The first valve body is connected to the defrosting control valve through the second flow tube, and the heat exchanger is located between the first valve body and the defrosting control valve. The refrigerating and air-conditioning system of claim 3, wherein the defrosting auxiliary module further comprises a bypass pipe, a second valve body and a third valve body, wherein the bypass pipe and the second flow pipe are arranged in parallel The first valve body is connected between the first valve body and the defroster control valve, and the second valve body is located between the heat exchanger and the first valve body, and the third valve body is located in the bypass pipe. The refrigerating and air conditioning system of claim 1, further comprising a heat recovery module, including a first-stage controller and a heat recovery unit, the flow direction controller is connected between the compressor and the condenser, one end of the heat recovery unit is connected to the flow direction controller, and the other end of the heat recovery unit is connected to the condenser The line between the expansion valve and the expansion valve. The refrigerating and air-conditioning system of claim 5, wherein the heat recovery module further comprises a liquid storage device connected to the heat recovery device. The refrigerating and air-conditioning system of claim 6, wherein the heat recovery module further comprises a second temperature sensor located in the liquid storage device, and the second temperature sensor is electrically connected to the flow direction controller. The refrigerating and air-conditioning system of claim 5, wherein the heat recovery module further comprises a pressure relief valve, one end of the pressure relief valve is connected to the flow direction controller, and the other end of the pressure relief valve is connected to the compressor The line between the evaporators. The refrigerating and air-conditioning system of claim 1, further comprising a superheat adjustment module comprising an outer cavity and an inner cavity in the outer cavity, the outer cavity having an outer cavity, the inner cavity The body has an inner chamber that communicates with the conduit between the condenser and the expansion valve, the inner chamber communicating with the conduit between the compressor and the evaporator. The refrigerating and air conditioning system of claim 9, wherein the superheat adjustment module further comprises a first tube body and a second tube body connected to the outer cavity body, and a third tube body connected to the inner cavity body a fourth pipe body, the first pipe body is connected to the condenser, the second pipe body is connected to the expansion device, the third pipe body is connected to the compressor, and the fourth pipe body is connected to the evaporator, so that the evaporator The discharged refrigerant will first reach the compressor after passing through the inner cavity, and the relative height of the opening of the first pipe body in the outer cavity is greater than the relatively high opening of the second pipe body in the outer cavity. The third tube is a U-shaped tube, and the relative height of the opening in the inner chamber is greater than the relative height of the opening of the fourth tube in the inner chamber. The refrigerating and air-conditioning system of claim 1, further comprising a flow divider, an auxiliary heat exchanger and a diverting line, the diverter being located between the expansion device and the evaporator, the diverting line One end is connected to the flow divider, and the other end of the branch line is connected to the line between the evaporator and the compressor, and the auxiliary heat exchanger is located on the branch line. The refrigerating and air-conditioning system of claim 11, wherein the auxiliary heat exchanger is disposed outdoors. A refrigerating air conditioning system comprising: a refrigerant circulation module comprising a compressor, a condenser, an expansion device and an evaporator, the compressor, the condenser, the expansion device and the evaporator passing through a pipeline Connected sequentially to form a circulation loop; and a heat recovery module comprising a first-class controller and a heat recovery unit, the flow direction controller being connected between the compressor and the condenser, one end of the heat recovery unit being connected The flow to the controller, the other end of the heat recovery unit being connected to the line between the condenser and the expansion valve. The refrigerating and air-conditioning system of claim 13, wherein the heat recovery module further comprises a liquid storage device connected to the heat recovery device. The refrigerating and air-conditioning system of claim 14, wherein the heat recovery module further comprises a second temperature sensor located in the liquid storage device, and the second temperature sensor is electrically connected to the flow direction controller. The refrigerating and air conditioning system of claim 13, wherein the heat recovery module further comprises a pressure relief valve, one end of the pressure relief valve is connected to the flow direction controller, and the other end of the pressure relief valve is connected to the pipeline between the compressor and the evaporator. The refrigerating and air-conditioning system according to claim 13 further comprising a defrost control valve connected to the evaporator and the condenser in a parallel arrangement relationship with the expansion device. The chilling air conditioning system of claim 17, further comprising a defrosting auxiliary module, comprising a first valve body and a first temperature sensor, wherein the opposite ends of the first valve body are respectively connected to the compressor and The defrosting control valve is located at the pipeline and adjacent to the defrosting control valve, and the first temperature sensor is electrically connected to the first valve body. The chilling air conditioning system of claim 18, wherein the defrosting auxiliary module further comprises a first flow tube, a second flow tube and a heat exchanger, wherein the first valve body is connected to the compressor through the first flow tube The first valve body is connected to the defrosting control valve through the second flow tube, and the heat exchanger is located between the first valve body and the defrosting control valve. The refrigerating and air-conditioning system of claim 19, wherein the defroster auxiliary module further comprises a bypass pipe, a second valve body and a third valve body, wherein the bypass pipe and the second flow pipe are arranged in parallel The first valve body is connected between the first valve body and the defroster control valve, and the second valve body is located between the heat exchanger and the first valve body, and the third valve body is located in the bypass pipe. The refrigerating and air conditioning system of claim 13, further comprising a superheat adjustment module comprising an outer cavity and an inner cavity in the outer cavity, the outer cavity having an outer cavity, the inner cavity The body has an inner chamber that communicates with the condenser and the The line between the expansion valves, the inner chamber communicating with the line between the compressor and the evaporator. The refrigerating and air conditioning system of claim 21, wherein the superheat adjustment module further comprises a first tube body and a second tube body connected to the outer cavity body, and a third tube body connected to the inner cavity body a fourth pipe body, the first pipe body is connected to the condenser, the second pipe body is connected to the expansion device, the third pipe body is connected to the compressor, and the fourth pipe body is connected to the evaporator, so that the evaporator The discharged refrigerant will first reach the compressor after passing through the inner cavity, and the relative height of the opening of the first pipe body in the outer cavity is greater than the relative height of the opening of the second pipe body in the outer cavity. The third tube is a U-shaped tube, and the relative height of the opening in the inner chamber is greater than the relative height of the fourth tube in the inner chamber. The refrigerating and air-conditioning system of claim 13, further comprising a flow divider, an auxiliary heat exchanger and a flow dividing line, the flow divider being located between the expansion device and the evaporator, the flow dividing line One end is connected to the flow divider, and the other end of the branch line is connected to the line between the evaporator and the compressor, and the auxiliary heat exchanger is located on the branch line. The refrigerating and air-conditioning system of claim 23, wherein the auxiliary heat exchanger is disposed outdoors.