Heat pump system capable of preventing ice accumulation

Abstract

The utility model relates to a heat pump system capable of preventing ice accumulation, which comprises a compressor, a four-way valve, a first heat exchanger and a second heat exchanger which sequentially form a refrigerant main loop, a water collecting tray is arranged at the bottom of the second heat exchanger, a first branch pipe is connected to the water collecting tray, and a first electromagnetic valve is arranged on the first branch pipe; the tail end of the first branch pipe is connected with a second branch pipe, and a water pump is arranged on the second branch pipe; the tail end of the second branch pipe is connected with a water drainage pipe, and a second electromagnetic valve is arranged on the water drainage pipe. A third branch pipe is arranged at the joint of the drainage pipe and the second branch pipe, a third electromagnetic valve is arranged on the third branch pipe, and the tail end of the third branch pipe is communicated with the water outlet pipe of the first heat exchanger. According to the scheme, the water pump is adopted for water pumping type drainage, and water in the water collecting disc is pumped and drained before being frozen. In addition, the water pump adds water in a water pumping mode, water in the water inlet pipeline is distributed to the position above the heat exchanger, defrosting of the heat exchanger is accelerated, and the defrosting time is shortened.

Description

Technical Field

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

[0002] With the continuous updating of technology, the sales scope of the unit is constantly expanding, the sales of the unit is constantly moving towards the north, and the requirements for the unit are constantly increasing. The existing drainage method cannot meet the needs of all markets. As a result, the unit often has poor drainage. In low ambient temperatures, it is even more likely that the unit water cannot be drained and accumulates into ice, affecting the use of the unit. Summary of the invention

[0003] In order to solve the above problems, the purpose of the utility model is to provide a heat pump system for preventing ice accumulation, which adopts a water pump to drain water from the water accumulation tray and discharge it before it freezes; in addition, the system adopts a water pump to add water, and the water in the water inlet pipe is diverted to the top of the heat exchanger, so as to accelerate the defrosting of the heat exchanger, reduce the defrosting time, and improve the cycle capacity of the unit; and the drainage method (discharge or recycling) can be automatically controlled to prevent the pipe from freezing and cracking.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] A heat pump system for preventing ice accumulation comprises a compressor, a four-way valve, a first heat exchanger and a second heat exchanger which sequentially constitute a refrigerant main circuit, and is characterized in that: a water collecting pan is provided at the bottom of the second heat exchanger, a first branch pipe is connected to the water collecting pan, and a first solenoid valve is provided on the first branch pipe; a second branch pipe is connected to the end of the first branch pipe, and a water pump is provided on the second branch pipe; a drain pipe is connected to the end of the second branch pipe, and a second solenoid valve is provided on the drain pipe; a third branch pipe is connected to the connection between the drain pipe and the second branch pipe, and a third solenoid valve is provided on the third branch pipe, and the end of the third branch pipe is connected to the water outlet pipe of the first heat exchanger.

[0006] Preferably, a flow switch is provided on the second branch pipe at the front side of the water pump.

[0007] Preferably, a fourth branch pipe is connected to the water inlet pipe of the first heat exchanger, a fourth solenoid valve is provided on the fourth branch pipe, and the fourth branch pipe is connected to the connection between the first branch pipe and the second branch pipe; a spray pipe is connected to the second branch pipe, a plurality of shunt pipes are provided at the end of the spray pipe, the plurality of shunt pipes are located above the second heat exchanger, and a fifth solenoid valve is provided on the spray pipe.

[0008] Preferably, a fan is provided on the outer side of the second heat exchanger.

[0009] Preferably, a gas-liquid separator is provided between the compressor suction port and the four-way valve.

[0010] Preferably, the compressor is provided with an air supply port, a third heat exchanger is connected between the air supply port and the first heat exchanger, a fifth branch pipe is passed between the third heat exchanger and the second heat exchanger, and a first expansion valve is provided on the fifth branch pipe.

[0011] Preferably, a sixth branch pipe is connected to the fifth branch pipe, the sixth branch pipe is connected to the other side of the third heat exchanger, and a second expansion valve is provided on the sixth branch pipe.

[0012] Preferably, when the heat pump system is in heating mode, the refrigerant passes through the compressor exhaust port, the four-way valve, the first heat exchanger, the third heat exchanger, the first expansion valve, the second heat exchanger, the four-way valve, the gas-liquid separator to the compressor intake port in sequence.

[0013] Preferably, when the heat pump system is in cooling mode, the refrigerant passes through the compressor exhaust port, the four-way valve, the second heat exchanger, the first expansion valve, the third heat exchanger, the first heat exchanger, the four-way valve, the gas-liquid separator to the compressor intake port in sequence.

[0014] The utility model adopts the above technical solution, and the method of preventing ice from piling up on the water collecting tray of the unit is to connect a pipe at the water collecting tray, and set a solenoid valve, a flow switch and a water pump on the corresponding pipe, and discharge the water on the water collecting tray in time when it is not frozen, so as to prevent the influence caused by ice blockage of the unit. Specifically, a large amount of water will be generated when the second heat exchanger is defrosted, and the water will flow down to the water collecting tray through the fin surface after defrosting, and the first solenoid valve will be opened, and the water will be discharged from the second solenoid valve through the flow switch and the operation of the water pump.

[0015] It should be noted here that the defrosted water can also enter the water outlet pipeline of the first heat exchanger in the system through the third branch pipe and the third solenoid valve, thereby improving resource utilization.

[0016] It should also be noted here that the opening conditions of the first solenoid valve and the water pump are determined based on the temperature of the temperature sensor on the second heat exchanger and the time to enter the defrost period. The flow switch detects the water inlet time. If the requirements are met, the water pump continues to run until the flow detection is insufficient and the pump is disconnected, and the water pump stops running.

[0017] In the above scheme, when the heat pump system enters the defrosting program, the fourth solenoid valve will open, and part of the water in the water inlet pipe will be introduced into the pipeline. The water pump will work to increase the water flow rate and water pressure. At this time, the fifth solenoid valve will also open, and water will flow into the diversion pipe, stay from the top of the second heat exchanger, and go to the water collection tray. Then, it will be discharged from the water collection tray to the first branch pipe and then to the second branch pipe for recycling (or discharged from the drain hole). The flow switch can adjust the opening of the fourth solenoid valve, the third solenoid valve and the second solenoid valve according to the detected water inlet volume, so as to keep the water flow in the pipeline stable and make rational use of resources.

[0018] It should be noted here that during defrosting, the system is in a refrigeration state, and the second heat exchanger releases heat, which will not cause the flowing water to freeze due to the low ambient temperature.

[0019] After defrosting is completed, each solenoid valve and water pump are controlled to be closed according to the temperature of the temperature sensor on the second heat exchanger and the time to enter the defrosting process.

[0020] It should be noted here that after defrosting is completed, the second solenoid valve needs to be opened to drain the excess water in the pipe to prevent low-temperature freezing and cracking of the pipe.

[0021] In addition, a third heat exchanger (small heat exchanger) is also provided in the above-mentioned heat pump system to replenish air for the system when the unit is in heating mode, thereby improving the capacity of the unit.

[0022] The above scheme has the following effects:

[0023] 1. Use a water pump to extract water from the water pan and drain it before it freezes.

[0024] 2. Use a water pump to add water, divert the water in the water inlet pipe to the top of the heat exchanger, accelerate the defrosting of the heat exchanger, and reduce the defrosting time.

[0025] 3. Add the second solenoid valve and the third solenoid valve to implement automatic control of drainage mode (discharge or recycling) to prevent pipe freezing and cracking and improve energy utilization.

[0026] 4. The cycle capacity of the unit is improved by reducing the defrosting time.

[0027] 5. It avoids the problem of low water outlet temperature and large changes in user's indoor temperature due to long-term defrosting, thereby improving user comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a water flow diagram for pumping water from the water collection pan in a heat pump system.

[0029] Figure 2 This is the water flow diagram for water pump auxiliary defrosting in the heat pump system.

[0030] Figure 3 This is the refrigerant flow diagram of the heat pump system in the heating state.

[0031] Figure 4 This is a refrigerant flow diagram in the heat pump system in the cooling state. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] like Figures 1 to 4 A heat pump system for preventing ice accumulation shown in the figure comprises a compressor 1, a four-way valve 2, a first heat exchanger 3 and a second heat exchanger 4 which sequentially constitute a refrigerant main circuit, a water collecting pan 5 is provided at the bottom of the second heat exchanger 4, a first branch pipe 6 is connected to the water collecting pan 5, and a first solenoid valve 7 is provided on the first branch pipe 6; a second branch pipe 8 is connected to the end of the first branch pipe 6, and a water pump 9 is provided on the second branch pipe 8; a drain pipe 10 is connected to the end of the second branch pipe 8, and a second solenoid valve 11 is provided on the drain pipe 10; a third branch pipe 13 is connected to the connection between the drain pipe 10 and the second branch pipe 8, and a third solenoid valve 14 is provided on the third branch pipe 13, and the end of the third branch pipe 13 is connected to the water outlet pipe of the first heat exchanger 3.

[0038] Furthermore, a flow switch 12 is provided on the second branch pipe 8 at the front side of the water pump 9 .

[0039] Furthermore, a fourth branch pipe 15 is connected to the water inlet pipe of the first heat exchanger 3, and a fourth solenoid valve 16 is provided on the fourth branch pipe 15. The fourth branch pipe 15 is connected to the connection between the first branch pipe 6 and the second branch pipe 8; a spray pipe 17 is connected to the second branch pipe 8, and a plurality of branch pipes 18 are provided at the end of the spray pipe 17. The plurality of branch pipes 18 are located above the second heat exchanger 4, and a fifth solenoid valve 19 is provided on the spray pipe 17.

[0040] Furthermore, a fan 20 is provided on the outer side of the second heat exchanger 4 .

[0041] Furthermore, a gas-liquid separator 21 is provided between the compressor suction port and the four-way valve 2 .

[0042] Furthermore, the compressor 1 is provided with an air supply port, a third heat exchanger 22 is connected between the air supply port and the first heat exchanger 3, a fifth branch pipe 23 is passed between the third heat exchanger 22 and the second heat exchanger 4, and a first expansion valve 24 is provided on the fifth branch pipe 23.

[0043] Furthermore, a sixth branch pipe 25 is connected to the fifth branch pipe 23 . The sixth branch pipe 25 is in communication with the other side of the third heat exchanger 22 . A second expansion valve 26 is disposed on the sixth branch pipe 25 .

[0044] Furthermore, when the heat pump system is in heating mode, the refrigerant passes through the compressor exhaust port, the four-way valve 2, the first heat exchanger 3, the third heat exchanger 22, the first expansion valve 24, the second heat exchanger 4, the four-way valve 2, and the gas-liquid separator 21 to the compressor intake port in sequence.

[0045] Furthermore, when the heat pump system is in cooling mode, the refrigerant passes through the compressor exhaust port, the four-way valve 2, the second heat exchanger 4, the first expansion valve 24, the third heat exchanger 22, the first heat exchanger 3, the four-way valve 2, the gas-liquid separator 21 to the compressor intake port in sequence.

[0046] In this specific embodiment, the problem that the accumulated water in the water collection tray of the existing heat pump unit in northern winter (especially in the defrost mode) is easy to freeze, causing ice blockage of the unit and affecting the performance of the unit is addressed. The above scheme connects a pipeline at the water collection tray, and sets a solenoid valve, a flow switch and a water pump on the corresponding pipeline, so that the water on the water collection tray is discharged in time when it is not frozen, thereby preventing the impact of ice blockage of the unit. Specifically, a large amount of water will be generated, especially when the second heat exchanger is defrosted. After defrosting, the water flows down to the water collection tray through the fin surface, the first solenoid valve is opened, and the water is discharged from the second solenoid valve through the flow switch and the operation of the water pump.

[0047] It should be noted here that the defrosted water can also enter the water outlet pipeline of the first heat exchanger in the system through the third branch pipe and the third solenoid valve, thereby improving resource utilization.

[0048] It should also be noted here that the opening conditions of the first solenoid valve and the water pump are determined based on the temperature of the temperature sensor on the second heat exchanger and the time to enter the defrost period. The flow switch detects the water inlet time. If the requirements are met, the water pump continues to run until the flow detection is insufficient and the pump is disconnected, and the water pump stops running.

[0049] In the above scheme, when the heat pump system enters the defrosting program, the fourth solenoid valve will open, and part of the water in the water inlet pipe will be introduced into the pipeline. The water pump will work to increase the water flow rate and water pressure. At this time, the fifth solenoid valve will also open, and water will flow into the diversion pipe, stay from the top of the second heat exchanger, and go to the water collection tray. Then, it will be discharged from the water collection tray to the first branch pipe and then to the second branch pipe for recycling (or discharged from the drain hole). The flow switch can adjust the opening of the fourth solenoid valve, the third solenoid valve and the second solenoid valve according to the detected water inlet volume, so as to keep the water flow in the pipeline stable and make rational use of resources.

[0050] It should be noted here that during defrosting, the system is in a refrigeration state, and the second heat exchanger releases heat, which will not cause the flowing water to freeze due to the low ambient temperature.

[0051] After defrosting is completed, each solenoid valve and water pump are controlled to be closed according to the temperature of the temperature sensor on the second heat exchanger and the time to enter the defrosting process.

[0052] It should be noted here that after defrosting is completed, the second solenoid valve needs to be opened to drain the excess water in the pipe to prevent low-temperature freezing and cracking of the pipe.

[0053] In addition, a third heat exchanger (small heat exchanger) is also provided in the above-mentioned heat pump system to replenish air for the system when the unit is in heating mode, thereby improving the capacity of the unit.

[0054] The above scheme has the following effects:

[0055] 1. Use a water pump to extract water from the water pan and drain it before it freezes.

[0056] 2. Use a water pump to add water, divert the water in the water inlet pipe to the top of the heat exchanger, accelerate the defrosting of the heat exchanger, and reduce the defrosting time.

[0057] 3. Add the second solenoid valve and the third solenoid valve to implement automatic control of drainage mode (discharge or recycling) to prevent pipe freezing and cracking and improve energy utilization.

[0058] 4. The cycle capacity of the unit is improved by reducing the defrosting time.

[0059] 5. It avoids the problem of low water outlet temperature and large changes in user's indoor temperature due to long-term defrosting, thereby improving user comfort.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A heat pump system for preventing ice accumulation, comprising a compressor (1), a four-way valve (2), a first heat exchanger (3) and a second heat exchanger (4) which sequentially constitute a main refrigerant circuit, characterized in that: A water collecting pan (5) is provided at the bottom of the second heat exchanger (4), a first branch pipe (6) is connected to the water collecting pan (5), and a first solenoid valve (7) is provided on the first branch pipe (6); a second branch pipe (8) is connected to the end of the first branch pipe (6), and a water pump (9) is provided on the second branch pipe (8); a drainage pipe (10) is connected to the end of the second branch pipe (8), and a second solenoid valve (11) is provided on the drainage pipe (10); a third branch pipe (13) is connected to the connection between the drainage pipe (10) and the second branch pipe (8), and a third solenoid valve (14) is provided on the third branch pipe (13), and the end of the third branch pipe (13) is connected to the water outlet pipe of the first heat exchanger (3).

2. The heat pump system for preventing ice accumulation according to claim 1, characterized in that: A flow switch (12) is provided on the second branch pipe (8) at the front side of the water pump (9).

3. The heat pump system for preventing ice accumulation according to claim 2, characterized in that: A fourth branch pipe (15) is connected to the water inlet pipe of the first heat exchanger (3), and a fourth solenoid valve (16) is provided on the fourth branch pipe (15). The fourth branch pipe (15) is connected to the connection between the first branch pipe (6) and the second branch pipe (8). A spray pipe (17) is connected to the second branch pipe (8), and a plurality of branch pipes (18) are provided at the end of the spray pipe (17). The plurality of branch pipes (18) are located above the second heat exchanger (4). A fifth solenoid valve (19) is provided on the spray pipe (17).

4. The heat pump system for preventing ice accumulation according to claim 3, characterized in that: A fan (20) is provided on the outside of the second heat exchanger (4).

5. The heat pump system for preventing ice accumulation according to claim 1, characterized in that: A gas-liquid separator (21) is provided between the compressor suction port and the four-way valve (2).

6. The heat pump system for preventing ice accumulation according to claim 5, characterized in that: The compressor (1) is provided with an air supply port, a third heat exchanger (22) is provided between the air supply port and the first heat exchanger (3), a fifth branch pipe (23) is provided between the third heat exchanger (22) and the second heat exchanger (4), and a first expansion valve (24) is provided on the fifth branch pipe (23).

7. The heat pump system for preventing ice accumulation according to claim 6, characterized in that: A sixth branch pipe (25) is connected to the fifth branch pipe (23), the sixth branch pipe (25) is in communication with the other side of the third heat exchanger (22), and a second expansion valve (26) is provided on the sixth branch pipe (25).

8. The heat pump system for preventing ice accumulation according to claim 7, characterized in that: When the heat pump system is in heating mode, the refrigerant passes through the compressor exhaust port, the four-way valve (2), the first heat exchanger (3), the third heat exchanger (22), the first expansion valve (24), the second heat exchanger (4), the four-way valve (2), the gas-liquid separator (21) in sequence to the compressor suction port.

9. The heat pump system for preventing ice accumulation according to claim 8, characterized in that: When the heat pump system is in cooling mode, the refrigerant passes through the compressor exhaust port, the four-way valve (2), the second heat exchanger (4), the first expansion valve (24), the third heat exchanger (22), the first heat exchanger (3), the four-way valve (2), the gas-liquid separator (21) in sequence to the compressor suction port.

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