Heat pump unit chassis deicing system

Abstract

The utility model discloses a chassis deicing system of a heat pump unit. The chassis deicing system of the heat pump unit comprises a double-pipe heat exchanger, an evaporator and a chassis, the double-pipe heat exchanger and the evaporator are both located on the base plate. The evaporator comprises heat exchange pipes and a fin set, and the multiple heat exchange pipes are arranged on the fin set at intervals. The heat exchange tubes located at the bottoms of the fin sets are bent to form deicing parts, and the deicing parts communicate with the double-pipe heat exchanger; a water falling hole is formed in the bottom of the chassis. A high-temperature refrigerant of the double-pipe heat exchanger enters the deicing part, when the system is in a heating mode and enters the deicing part, the deicing part automatically defrosts, when the high-temperature refrigerant in a pipeline defrosts a fin set, the refrigerant in the deicing part melts condensed water frozen on a base plate at the same time, and it is guaranteed that the situation that the condensed water cannot be discharged due to ice blockage when the fin set defrosts is avoided; therefore, power consumption waste and potential safety hazards caused by electric heating deicing are avoided, the structure is more simplified, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a chassis deicing system for a heat pump unit. Background Art

[0002] When the air source heat pump unit is operating in a low temperature area or an area with heavy snow and wind, the water condensed on the surface of the evaporator fins of the heat pump unit will drip onto the chassis. If the heat pump unit runs for a long time, it will cause ice to form on the surface of the evaporator fins and the chassis of the air source heat pump unit, and the chassis will not be able to drain properly. In particular, after the evaporator of the air source heat pump unit is defrosted, water droplets formed by the melted frost remain on the chassis, which will also aggravate the icing condition of the chassis.

[0003] The main method for deicing the chassis in the prior art is to add an electric heating belt to the chassis and melt the ice on the chassis by the heat generated by the electric heating. Since the chassis heating belt is easy to bend, there is a gap between it and the chassis, so the heat transfer coefficient is small and the ice melting effect is poor. However, this method is more power-consuming, has high safety risks, and seriously wastes resources.

[0004] In the prior art, there is also a system with chassis defrosting function, including an evaporator, a chassis, a compressor and a shell-and-tube heat exchanger. The evaporator is arranged on the chassis, and a heater is arranged under the chassis. The evaporator, the compressor and the shell-and-tube heat exchanger are respectively connected to the four-way valve. The shell-and-tube heat exchanger is connected to the heat exchange coil in the heater through a heating check valve, and the heat exchange coil is connected to the evaporator through a throttle valve. The shell-and-tube heat exchanger is also connected to the evaporator through a defrosting check valve and a throttle valve. The defrosting function is achieved by the heater, but the structure is relatively complex and the cost is relatively high. There is a risk of damaging the heater when hoisting the heat pump.

[0005] Therefore, how to de-ice the chassis while reducing costs is a problem that technicians currently need to solve. Utility Model Content

[0006] In order to overcome the problems existing in the related technology, the utility model provides a chassis defrosting system for a heat pump unit. The high-temperature refrigerant of the shell and tube heat exchanger enters the defrosting part. In the heating mode, when entering the defrosting part, the defrosting part automatically defrosts. While the high-temperature refrigerant in the pipeline defrosts the fin group, the refrigerant in the defrosting part melts the frozen condensed water on the chassis at the same time, ensuring that the defrosted condensed water of the fin group will not be unable to be discharged due to ice blockage, thereby eliminating the need for power waste and safety hazards caused by using electric heating for defrosting, and compared with the prior art, the structure is simpler and the cost is reduced.

[0007] The utility model provides a heat pump unit chassis deicing system, the heat pump unit chassis deicing system comprising a shell and tube heat exchanger, an evaporator and a chassis;

[0008] The shell and tube heat exchanger and the evaporator are both located on the chassis;

[0009] The evaporator comprises a heat exchange tube and a fin group, and a plurality of the heat exchange tubes are arranged on the fin group at intervals;

[0010] The heat exchange tube located at the bottom of the fin group is bent to form an ice-melting portion, and the ice-melting portion is communicated with the shell-and-tube heat exchanger;

[0011] A water drop hole is arranged at the bottom of the chassis.

[0012] Furthermore, the de-icing unit is provided with a one-way valve;

[0013] The deicing unit is in communication with the double-tube heat exchanger via the one-way valve.

[0014] Furthermore, the ice-melting part is composed of a plurality of arc-shaped tubes;

[0015] The plane where the arc tube is located is parallel to the plane where the chassis is located.

[0016] Furthermore, the heat pump unit chassis deicing system also includes a compressor,

[0017] An exhaust port is provided at one end of the compressor, and the exhaust port is communicated with the shell and tube heat exchanger based on a four-way valve.

[0018] Furthermore, the heat pump unit chassis deicing system also includes a liquid separation tank;

[0019] The other end of the compressor is provided with an air inlet;

[0020] The liquid distributor comprises a main pipe and a branch pipe, wherein the main pipe is connected to the air inlet of the compressor;

[0021] The branch pipe is communicated with the evaporator via a four-way valve.

[0022] Furthermore, the heat pump unit chassis deicing system also includes a liquid reservoir;

[0023] The liquid storage device is in communication with the ice-melting unit.

[0024] The utility model provides a chassis defrosting system for a heat pump unit, wherein the high-temperature refrigerant of the shell-and-tube heat exchanger enters the defrosting part, and in the heating mode, when entering the defrosting part, the defrosting part automatically defrosts, and while the high-temperature refrigerant in the pipeline defrosts the fin group, the refrigerant in the defrosting part melts the frozen condensed water on the chassis at the same time, ensuring that the defrosted condensed water of the fin group cannot be discharged due to ice blockage, thereby eliminating the need for power consumption waste and safety hazards caused by using electric heating for defrosting, and compared with the prior art, the structure is simpler and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0026] Figure 1 It is a structural diagram of the chassis deicing system of the heat pump unit in the utility model;

[0027] Figure 2 yes Figure 1 A magnified image of point A;

[0028] Figure 3 yes Figure 1 Enlarged view of point B. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] refer to Figures 1 to 3 The chassis deicing system of the heat pump unit includes a shell and tube heat exchanger, an evaporator 1 and a chassis 2; the shell and tube heat exchanger and the evaporator 1 are both located on the chassis 2; the evaporator 1 includes a heat exchange tube 11 and a fin group 12, and a plurality of the heat exchange tubes 11 are arranged on the fin group 12 at intervals; the heat exchange tube 11 located at the bottom of the fin group 12 is bent to form a deicing portion 111, and the deicing portion 111 is connected to the shell and tube heat exchanger; a water drop hole 201 is provided at the bottom of the chassis 2.

[0031] Specifically, the shell and tube heat exchanger is arranged on the refrigerant circulation pipeline, the evaporator 1 is arranged in the refrigerant circulation pipeline, and the ice-melting part 111 and the shell and tube heat exchanger are both located near the water drop hole 201 of the bottom plate 2 .

[0032] In the heating mode, when entering the defrosting mode, the defrosting unit automatically defrosts, and the heat exchange tube 11 defrosts the fin group 12. At this time, the high-temperature refrigerant in the pipeline defrosts the fin group 12, and the refrigerant in the defrosting unit 111 melts the frozen condensed water in the chassis 2 at the same time. The condensed water is discharged through the drain hole 201 of the chassis 2, ensuring that the defrosted condensed water of the fin group 12 will not be unable to be discharged due to ice blockage, thereby eliminating the need to use electric heating to defrost and causing power waste and safety hazards. In addition, compared with the prior art, the structure is simpler and the cost is reduced. The method of controlling the defrosting of the system is: in the defrosting state, obtain the difference temperature between the coil temperature and the water temperature of the shell and tube heat exchanger; according to the difference temperature between the coil temperature and the water temperature of the shell and tube heat exchanger, control the evaporator 1 to defrost.

[0033] Furthermore, the de-icing unit 111 is provided with a one-way valve 3 ; the de-icing unit 111 is connected with the shell and tube heat exchanger based on the one-way valve 3 .

[0034] Specifically, a one-way valve 3 is provided in the defrosting part 111, and the refrigerant can only flow from the direction of the shell and tube heat exchanger to the defrosting part 111 of the evaporator 1, but cannot flow back. The waste heat of the refrigerant can also be used to defrost the bottom of the evaporator 1, and the refrigerant supercooling function is realized at the same time, thereby improving energy utilization and reducing system energy consumption.

[0035] Furthermore, the ice-melting part 111 is composed of a plurality of arc-shaped tubes; the plane where the arc-shaped tubes are located is parallel to the plane where the chassis 2 is located.

[0036] Specifically, the plane where the arc-shaped tube is located is parallel to the plane where the bottom plate 2 is located, which can increase the heat exchange area, thereby improving the heat exchange efficiency and increasing the ice melting effect.

[0037] Furthermore, the chassis defrosting system of the heat pump unit also includes a liquid separator; an air inlet is provided at the other end of the compressor; the liquid separator includes a main pipe and a branch pipe, the main pipe is connected to the air inlet of the compressor; the branch pipe is connected to the evaporator 1 based on a four-way valve.

[0038] Specifically, the liquid separator separates the refrigerant gas and the refrigerant liquid, and the refrigerant gas enters the compressor through the main pipe, and the refrigerant liquid enters the evaporator 1 through the branch pipe to continue absorbing heat and evaporating.

[0039] Furthermore, the heat pump unit chassis defrosting system also includes a compressor, one end of the compressor is provided with an exhaust port, and the exhaust port is connected to the shell and tube heat exchanger based on a four-way valve.

[0040] Specifically, when the compressor compresses the low-pressure and low-temperature refrigerant into high-pressure and high-temperature refrigerant, the high-pressure and high-temperature refrigerant flows from the exhaust port at one end of the compressor to the shell and tube heat exchanger based on the four-way valve. When the refrigerant discharged from the exhaust port of the compressor enters the shell and tube heat exchanger through the four-way valve, the refrigerant enters the defrosting part 111 at the bottom of the evaporator 1 along the pipeline and flows out from the heat exchange tube 11 at the top of the evaporator 1.

[0041] Furthermore, the heat pump unit chassis de-icing system further includes a liquid reservoir; the liquid reservoir is in communication with the de-icing unit 111 .

[0042] Specifically, after the heat of the high-temperature refrigerant is transferred to the fin group 12 and the chassis 2, the refrigerant temperature is reduced and flows into the liquid reservoir.

[0043] The utility model provides a heat pump unit chassis defrosting system. In the heating mode, when entering defrosting, the defrosting part automatically defrosts, and the heat exchange tube 11 defrosts the fin group 12. At this time, the high-temperature refrigerant in the pipeline defrosts the fin group 12, and the refrigerant in the defrosting part 111 melts the frozen condensed water in the chassis 2 at the same time. The condensed water is discharged through the drain hole 201 of the chassis 2, ensuring that the defrosted condensed water of the fin group 12 will not be unable to be discharged due to ice blockage, thereby eliminating the need to use electric heating to defrost and causing power consumption waste and safety hazards, and compared with the prior art, the structure is simpler and the cost is reduced. The method of controlling the defrosting of the system is: in the defrosting state, obtaining the difference temperature between the coil temperature and the water temperature of the shell and tube heat exchanger; according to the difference temperature between the coil temperature and the water temperature of the shell and tube heat exchanger, controlling the evaporator 1 to defrost.

[0044] In addition, the above is a detailed introduction to the chassis defrosting system of the heat pump unit provided in the embodiment of the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A heat pump unit chassis deicing system, characterized in that: The heat pump unit chassis deicing system comprises a shell and tube heat exchanger, an evaporator and a chassis; The shell and tube heat exchanger and the evaporator are both located on the chassis; The evaporator comprises a heat exchange tube and a fin group, and a plurality of the heat exchange tubes are arranged on the fin group at intervals; The heat exchange tube located at the bottom of the fin group is bent to form an ice-melting portion, and the ice-melting portion is communicated with the shell-and-tube heat exchanger; A water drop hole is arranged at the bottom of the chassis.

2. The heat pump unit chassis deicing system according to claim 1, characterized in that: The de-icing unit is provided with a one-way valve; The deicing unit is in communication with the double-tube heat exchanger via the one-way valve.

3. The heat pump unit chassis deicing system according to claim 1, characterized in that: The ice melting part is composed of a plurality of arc-shaped tubes; The plane where the arc tube is located is parallel to the plane where the chassis is located.

4. The heat pump unit chassis deicing system according to claim 1, characterized in that: The heat pump unit chassis deicing system also includes a compressor, An exhaust port is provided at one end of the compressor, and the exhaust port is communicated with the shell and tube heat exchanger based on a four-way valve.

5. The heat pump unit chassis deicing system according to claim 4, characterized in that: The heat pump unit chassis deicing system also includes a liquid separation tank; The other end of the compressor is provided with an air inlet; The liquid distributor includes a main pipe and a branch pipe, wherein the main pipe is communicated with the air inlet of the compressor; and the branch pipe is communicated with the evaporator based on a four-way valve.

6. The heat pump unit chassis deicing system according to claim 1, characterized in that: The heat pump unit chassis deicing system also includes a liquid reservoir; The liquid storage device is in communication with the ice-melting unit.

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