A clean thermal energy assisted air source heat pump non-stop defrosting system

Abstract

The present invention discloses a clean heat energy assisted air source heat pump non-stop defrosting system, comprising a solar water tank, an indoor heat exchanger and a heat pump body, wherein the indoor heat exchanger is provided with a heat exchange inlet and a heat exchange outlet, the solar water tank is provided with a water circulation inlet and a water circulation outlet, and the heat pump body comprises a compressor, a heating capillary, a fin heat exchanger, a shell and tube heat exchanger and a refrigeration capillary. The system structure of the present invention is simple, can meet the user's three-season hot water needs, and can make full use of the low-temperature heat of solar energy in winter, so that the air source heat pump does not stop during defrosting, and the user comfort is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat utilization, and in particular to a clean heat energy assisted air source heat pump non-stop defrosting system. Background Art

[0002] Air source heat pump is a new type of heating product commonly used now. It has low operating cost, wide application range, temperature range from minus 35 degrees to 45 degrees, and can be used all year round. It can be used normally on cloudy days, rain, snow, sleet and other bad weather and winter nights without being affected by the environment.

[0003] The disadvantage of air source heat pumps is that they are prone to frosting problems, especially in high humidity areas such as the middle part of the Yangtze River. Frequent frosting will seriously affect user needs.

[0004] The existing methods to solve the frosting of air source heat pumps are mainly shutdown defrosting or reverse cycle defrosting, which will affect the user's heating needs. Summary of the invention

[0005] In view of the problems existing in the prior art that affect practical use, the present invention proposes a clean thermal energy assisted air source heat pump non-stop defrosting system with reliable performance, high energy efficiency ratio and non-stop defrosting to solve the defects of the prior art.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a clean heat energy assisted air source heat pump non-stop defrosting system, which is characterized by: comprising a solar water tank, an indoor heat exchanger and a heat pump body,

[0007] The indoor heat exchanger is provided with a heat exchange inlet and a heat exchange outlet, and the solar water tank is provided with a water circulation inlet and a water circulation outlet.

[0008] The heat pump body includes a compressor, a heating capillary tube, a fin heat exchanger, a shell and tube heat exchanger and a refrigeration capillary tube;

[0009] One end of the refrigeration capillary tube is connected to the heat exchange outlet of the indoor heat exchanger;

[0010] The outlet of the compressor is connected to the first pipeline, the second pipeline and the third pipeline through a four-way valve, the inlet of the compressor is connected to a compression circuit, the compression circuit is provided with a second solenoid valve F2, the other end of the second pipeline is connected to the compression circuit, and the other end of the first pipeline is connected to the heat exchange inlet of the indoor heat exchanger;

[0011] The third pipeline is connected to the other end of the refrigeration capillary tube, and a first solenoid valve F1 and a fourth solenoid valve F4 are arranged on the third pipeline. The fin heat exchanger, the heating capillary tube and the shell-and-tube heat exchanger are arranged in sequence on the third pipeline between the first solenoid valve F1 and the fourth solenoid valve F4, and the fin heat exchanger is arranged close to the fourth solenoid valve F4; the end of the compression circuit is arranged on the third pipeline between the first solenoid valve F1 and the shell-and-tube heat exchanger;

[0012] A fourth pipeline is provided in parallel with the third pipeline. One end of the fourth pipeline is connected to the fourth solenoid valve F4, and the other end is connected to the refrigeration capillary. A third solenoid valve F3 is provided on the fourth pipeline.

[0013] The indoor heat exchanger is any indoor heat exchanger disclosed in the prior art and suitable for use in an air source heat pump unit.

[0014] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme: the shell and tube heat exchanger is provided with a circulation inlet and a circulation outlet, the circulation inlet and the circulation outlet are connected to the water circulation outlet and the water circulation inlet of the solar water tank through a circulation pipeline, an expansion tank is provided on the circulation pipeline flowing to the circulation inlet end of the shell and tube heat exchanger, and a circulation pump is provided on the circulation pipeline flowing out of the circulation outlet end of the shell and tube heat exchanger.

[0015] The technical problem to be solved by the present invention can also be further achieved through the following technical scheme: the solar water tank is provided with an inner tank and an outer tank, a heat exchange coil and electric heating are arranged in the inner tank, the water circulation outlet and the water circulation inlet of the solar water tank are connected to the two ends of the heat exchange coil, and the inner tank is also connected with water inlet and outlet pipes.

[0016] The technical problem to be solved by the present invention can be further achieved by the following technical solution: a one-way valve is connected in parallel to the refrigeration capillary tube.

[0017] The technical problem to be solved by the present invention can be further achieved by the following technical solution: circulation branches are connected in parallel at both ends of the heating capillary tube, and a fifth solenoid valve F5 is provided on the circulation branch.

[0018] The technical problem to be solved by the present invention can be further achieved by the following technical solution. The system has a refrigerant in the compressor, a low-temperature antifreeze liquid in the shell and tube heat exchanger, and has a heating mode, a cooling mode and a defrosting mode;

[0019] The heating mode: the compressor is turned on, F1 and F4 are turned on, and F2, F3, and F5 are turned off. After the refrigerant is compressed by the compressor, it releases heat in the indoor heat exchanger, flows to the shell and tube heat exchanger through the one-way valve, releases and stores part of the heat to the low-temperature antifreeze in the shell and tube heat exchanger, passes through the heating capillary throttling, absorbs heat from the air in the outdoor heat exchanger, and returns to the compressor;

[0020] The refrigeration mode: the compressor is turned on, F1, F4, and F5 are turned on, and F2 and F3 are turned off. After being compressed by the compressor, the refrigerant dissipates heat to the outside in the fin heat exchanger, releases part of the heat through the shell and tube heat exchanger, and after throttling through the refrigeration capillary, releases the cold in the indoor heat exchanger and returns to the compressor; when the temperature of the low-temperature antifreeze in the shell and tube heat exchanger is 5°C-10°C higher than the temperature of the solar water tank, the circulation pump is started and the fan of the fin heat exchanger is decelerated; when the temperature of the low-temperature antifreeze in the tube heat exchanger is less than or equal to the temperature of the solar water tank by 5°C-10°C, the circulation pump is turned off and the fan of the fin heat exchanger operates normally;

[0021] The defrost mode: the compressor is turned on, F2 and F3 are turned on, and F1, F4, and F5 are turned off. After the refrigerant is compressed by the compressor and releases heat in the indoor heat exchanger, it flows to the fin heat exchanger through the one-way valve to defrost the fin heat exchanger, and is throttled by the heating capillary. It absorbs and stores heat in the shell and tube heat exchanger and the heat of the solar water tank and returns to the compressor; when the temperature of the low-temperature antifreeze in the shell and tube heat exchanger is lower than 15°C-25°C, the circulating pump is started, and when the temperature of the solar water tank is lower than 25°C, the electric heating is turned on to heat it to 35°C.

[0022] In this system, the compressor is filled with refrigerant, and the shell and tube heat exchanger is provided with low-temperature antifreeze. The refrigerant exchanges heat with the low-temperature antifreeze in the shell through the tube. In the defrost mode, the shell and tube heat exchanger becomes an evaporator, and the residual heat after indoor heat release is used for defrosting. The heat of solar energy is absorbed from the shell and tube heat exchanger, and the solar energy and part of the stored energy are used for defrosting indirectly, thereby achieving defrosting without stopping the machine, and defrosting does not affect the user's heating demand at all.

[0023] In heating mode, after the indoor heat is released, part of the heat is stored in the shell and tube heat exchanger, so that the refrigerant is supercooled, absorbing more heat from the outdoor air, and increasing the overall heating capacity of the unit. In cooling mode, according to the actual situation, if it is rainy for consecutive days and the water temperature of the solar water tank is low, the wind speed of the fin heat exchanger fan can be reduced, etc., to retain part of the heat and recover it to the solar water tank through the shell and tube heat exchanger.

[0024] Reasonable use of solar clean energy, give full play to the role of solar energy in winter, even if the water temperature is too low to be used as domestic hot water, low-level heat can be used for defrosting. The shell and tube heat exchanger is set to provide a supercooling process for the refrigerant, improve the energy efficiency of the original system, and partially recover heat in the cooling mode to improve energy efficiency.

[0025] Compared with the prior art, the system structure of the present invention is simple and can meet the user's hot water needs in three seasons. At the same time, it can make full use of the low-temperature heat of solar energy in winter, so that the air source heat pump does not stop during defrosting, and the user comfort is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0027] Figure 1 A system schematic diagram of the present invention. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0029] See also Figure 1 A clean thermal energy assisted air source heat pump non-stop defrosting system includes a solar water tank 9, an indoor heat exchanger 1 and a heat pump body. The solar water tank 9 can be a plug-in solar water heater tank 9; the indoor heat exchanger 1 is provided with a heat exchange inlet and a heat exchange outlet, and the solar water tank 9 is provided with a water circulation inlet and a water circulation outlet.

[0030] The heat pump body includes a compressor 6, a heating capillary tube 15, a fin heat exchanger 7, a shell and tube heat exchanger 12 and a cooling capillary tube 14;

[0031] One end of the refrigeration capillary tube 14 is connected to the heat exchange outlet of the indoor heat exchanger 1 ; a one-way valve 13 is connected in parallel to the refrigeration capillary tube 14 .

[0032] The outlet of the compressor 6 is connected to the first pipeline 3, the second pipeline 2 and the third pipeline 5 through the four-way valve 4, the inlet of the compressor 6 is connected to the compression circuit 16, the compression circuit 16 is provided with a second solenoid valve F2, the other end of the second pipeline 2 is connected to the compression circuit 16, and the other end of the first pipeline 3 is connected to the heat exchange inlet of the indoor heat exchanger 1;

[0033] The third pipeline 5 is connected to the other end of the refrigeration capillary tube 14. The first solenoid valve F1 and the fourth solenoid valve F4 are arranged on the third pipeline 5. The fin heat exchanger 7, the heating capillary tube 15 and the shell and tube heat exchanger 12 are arranged on the third pipeline 5 between the first solenoid valve F1 and the fourth solenoid valve F4 in sequence. The fin heat exchanger 7 is arranged close to the fourth solenoid valve F4. The end of the compression circuit 16 is arranged on the third pipeline 5 between the first solenoid valve F1 and the shell and tube heat exchanger 12.

[0034] A fourth pipeline 8 is provided in parallel with the third pipeline 5 . One end of the fourth pipeline 8 is connected to the fourth electromagnetic valve F4 , and the other end of the fourth pipeline 8 is connected to the refrigeration capillary 14 . A third electromagnetic valve F3 is provided on the fourth pipeline 8 .

[0035] The two ends of the heating capillary tube 15 are connected in parallel with circulation branches, and a fifth solenoid valve F5 is provided on the circulation branch.

[0036] The shell and tube heat exchanger 12 is provided with a circulation inlet and a circulation outlet, which are connected to the water circulation outlet and the water circulation inlet of the solar water tank 9 through a circulation pipeline. An expansion tank 11 is provided on the circulation pipeline flowing to the circulation inlet end of the shell and tube heat exchanger 12, and a circulation pump 10 is provided on the circulation pipeline flowing out of the circulation outlet end of the shell and tube heat exchanger 12.

[0037] The solar water tank 9 is provided with an inner tank and an outer shell, a heat exchange coil and electric heating are provided in the inner tank, a water circulation outlet and a water circulation inlet of the solar water tank 9 are connected with both ends of the heat exchange coil, and an inlet and outlet water pipeline is connected to the inner tank. A water supply solenoid valve is provided on the inlet and outlet water pipeline, and a water supply pipeline is connected.

[0038] The system compressor 6 is filled with refrigerant, and the shell and tube heat exchanger 12 is provided with low-temperature antifreeze liquid, which has a heating mode, a cooling mode and a defrosting mode;

[0039] In the heating mode, the compressor 6 is turned on, F1 and F4 are turned on, and F2, F3, and F5 are turned off. After the refrigerant is compressed by the compressor 6, the indoor heat exchanger 1 releases heat, flows to the shell and tube heat exchanger 12 through the one-way valve 13, releases and stores part of the heat to the low-temperature antifreeze liquid in the shell and tube heat exchanger 12, passes through the heating capillary 15 for throttling, absorbs heat from the air in the outdoor heat exchanger, and returns to the compressor 6.

[0040] The refrigeration mode: the compressor 6 is turned on, F1, F4, and F5 are turned on, and F2 and F3 are turned off. After being compressed by the compressor 6, the refrigerant dissipates heat to the outside in the fin heat exchanger 7, releases part of the heat through the shell and tube heat exchanger 12, and after being throttled by the refrigeration capillary 14, it releases the coldness to the indoor heat exchanger 1 and returns to the compressor 6; when the temperature of the low-temperature antifreeze liquid in the shell and tube heat exchanger 12 is greater than the temperature of the solar water tank 9 by 5°C, the circulation pump 10 is started and the fan of the fin heat exchanger 7 is decelerated; when the temperature of the low-temperature antifreeze liquid in the tube heat exchanger is less than or equal to the temperature of the solar water tank 9 by 5°C, the circulation pump 10 is turned off and the fan of the fin heat exchanger 7 runs normally;

[0041] In the defrost mode, the compressor 6 is turned on, F2 and F3 are turned on, and F1, F4, and F5 are turned off. After the refrigerant is compressed by the compressor 6, the indoor heat exchanger 1 releases heat, and then flows to the fin heat exchanger 7 through the one-way valve 13 to defrost the fin heat exchanger 7. After throttling through the heating capillary 15, the refrigerant absorbs and stores heat in the shell and tube heat exchanger 12 and the heat of the solar water tank 9, and then returns to the compressor 6. When the temperature of the low-temperature antifreeze in the shell and tube heat exchanger 12 is lower than 20°C, the circulating pump 10 is started. In the defrost mode, when the temperature of the solar water tank 9 is lower than 25°C, the electric heating is turned on, and the electric heating operation is stopped when the temperature reaches 35°C.

[0042] In this system, the compressor 6 is filled with refrigerant, and the shell and tube heat exchanger 12 is provided with low-temperature antifreeze. The refrigerant exchanges heat with the low-temperature antifreeze in the shell through the tube. In the defrost mode, the shell and tube heat exchanger 12 becomes an evaporator, and the residual heat after indoor heat release is used for defrosting. The heat of solar energy is absorbed from the shell and tube heat exchanger 12, and the solar energy and part of the stored energy are used for defrosting indirectly, thereby realizing defrosting without stopping the machine, and defrosting does not affect the user's heating demand at all.

[0043] In the heating mode, after the indoor heat is released, part of the heat is stored in the shell and tube heat exchanger 12, so that the refrigerant is supercooled, absorbing more heat from the outdoor air, and increasing the overall heating capacity of the unit. In the cooling mode, according to the actual situation, if it is rainy for consecutive days and the water temperature of the solar water tank 9 is low, the wind speed of the fan of the fin heat exchanger 7 can be reduced, and part of the heat can be retained and recovered to the solar water tank 9 through the shell and tube heat exchanger 12.

[0044] Reasonable use of solar clean energy, give full play to the role of solar energy in winter, even if the water temperature is too low to be used as domestic hot water, but the low-level heat can be used for defrosting. The shell and tube heat exchanger is set to provide a supercooling process for the refrigerant, improve the energy efficiency of the original system, and partially recover heat in the cooling mode to improve energy utilization efficiency. It can meet the user's three-season hot water needs. At the same time, the low-temperature heat of solar energy can be fully utilized in winter, so that the air source heat pump does not stop during defrosting, and the user comfort is greatly improved.

[0045] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A clean heat energy assisted air source heat pump non-stop defrosting system, characterized by: Including solar water tank, indoor heat exchanger and heat pump body, The indoor heat exchanger is provided with a heat exchange inlet and a heat exchange outlet, and the solar water tank is provided with a water circulation inlet and a water circulation outlet. The heat pump body includes a compressor, a heating capillary tube, a fin heat exchanger, a shell and tube heat exchanger and a refrigeration capillary tube; One end of the refrigeration capillary tube is connected to the heat exchange outlet of the indoor heat exchanger; The outlet of the compressor is connected to the first pipeline, the second pipeline and the third pipeline through a four-way valve, the inlet of the compressor is connected to a compression circuit, the compression circuit is provided with a second solenoid valve F2, the other end of the second pipeline is connected to the compression circuit, and the other end of the first pipeline is connected to the heat exchange inlet of the indoor heat exchanger; The third pipeline is connected to the other end of the refrigeration capillary tube, and a first solenoid valve F1 and a fourth solenoid valve F4 are arranged on the third pipeline. The fin heat exchanger, the heating capillary tube and the shell-and-tube heat exchanger are arranged on the third pipeline between the first solenoid valve F1 and the fourth solenoid valve F4 in sequence, and the fin heat exchanger is arranged close to the fourth solenoid valve F4; the end of the compression circuit is arranged on the third pipeline between the first solenoid valve F1 and the shell-and-tube heat exchanger; A fourth pipeline is provided in parallel with the third pipeline. One end of the fourth pipeline is connected to the fourth solenoid valve F4, and the other end is connected to the refrigeration capillary. A third solenoid valve F3 is provided on the fourth pipeline.

2. According to claim 1, a clean heat energy assisted air source heat pump non-stop defrosting system is characterized by: The shell and tube heat exchanger is provided with a circulation inlet and a circulation outlet, which are connected to the water circulation outlet and the water circulation inlet of the solar water tank through a circulation pipeline. An expansion tank is provided on the circulation pipeline flowing to the circulation inlet end of the shell and tube heat exchanger, and a circulation pump is provided on the circulation pipeline flowing out of the circulation outlet end of the shell and tube heat exchanger.

3. A clean heat energy assisted air source heat pump non-stop defrosting system according to claim 2, characterized in that: The solar water tank is provided with an inner tank and an outer tank, wherein a heat exchange coil and electric heating are arranged in the inner tank, a water circulation outlet and a water circulation inlet of the solar water tank are connected with two ends of the heat exchange coil, and an inlet and outlet water pipeline is also connected to the inner tank.

4. The clean heat energy assisted air source heat pump non-stop defrosting system according to claim 1, characterized in that: The refrigeration capillary is connected in parallel with a one-way valve.

5. A clean heat energy assisted air source heat pump non-stop defrosting system according to claim 4, characterized in that: Both ends of the heating capillary are connected in parallel with circulation branches, and a fifth solenoid valve F5 is provided on the circulation branch.

6. A clean heat energy assisted air source heat pump non-stop defrosting system according to claim 5, characterized in that: The system has a refrigerant in the compressor and a low-temperature antifreeze in the shell and tube heat exchanger. It has a heating mode, a cooling mode and a defrosting mode. The heating mode: the compressor is turned on, F1 and F4 are turned on, and F2, F3, and F5 are turned off. After the refrigerant is compressed by the compressor, it releases heat in the indoor heat exchanger, flows to the shell and tube heat exchanger through the one-way valve, releases and stores part of the heat to the low-temperature antifreeze in the shell and tube heat exchanger, passes through the heating capillary throttling, absorbs heat from the air in the outdoor heat exchanger, and returns to the compressor; The refrigeration mode: the compressor is turned on, F1, F4, and F5 are turned on, and F2 and F3 are turned off. After being compressed by the compressor, the refrigerant dissipates heat to the outside in the fin heat exchanger, releases part of the heat through the shell and tube heat exchanger, and after throttling through the refrigeration capillary, releases the cold in the indoor heat exchanger and returns to the compressor; when the temperature of the low-temperature antifreeze in the shell and tube heat exchanger is 5°C-10°C higher than the temperature of the solar water tank, the circulation pump is started and the fan of the fin heat exchanger is decelerated; when the temperature of the low-temperature antifreeze in the tube heat exchanger is less than or equal to the temperature of the solar water tank by 5°C-10°C, the circulation pump is turned off and the fan of the fin heat exchanger operates normally; The defrost mode: the compressor is turned on, F2 and F3 are turned on, and F1, F4, and F5 are turned off. After the refrigerant is compressed by the compressor and releases heat in the indoor heat exchanger, it flows to the fin heat exchanger through the one-way valve to defrost the fin heat exchanger, and after throttling through the heating capillary, it absorbs and stores heat in the shell and tube heat exchanger and the heat of the solar water tank, and returns to the compressor; when the temperature of the low-temperature antifreeze in the shell and tube heat exchanger is lower than 15°C-25°C, the circulating pump is started.

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