A defrosting system for uninterrupted heating

Abstract

This utility model relates to the field of heat pump technology, specifically to a defrosting system for uninterrupted heating. It includes a compressor outlet with a first branch and a second branch connected in parallel. The first branch is sequentially equipped with a first four-way reversing valve, a first air-side heat exchanger, and a fourth one-way valve. The second branch is sequentially equipped with a second four-way reversing valve, a second air-side heat exchanger, and a fifth one-way valve. The first and second branches are connected in parallel to a main circuit. Along the liquid return direction, the main circuit is sequentially equipped with an electronic expansion valve, a water-side heat exchanger, a second solenoid valve, and a first solenoid valve. The system allows for flexible switching between heating, cooling, and defrosting modes via the first and second four-way reversing valves. By controlling the flow direction of the four-way reversing valves, the system quickly switches between modes to achieve optimal operation under different conditions. Furthermore, it ensures that the defrosting process of the first and second air-side heat exchangers does not affect the temperature of the water-side heat exchanger.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and in particular to a defrosting system that provides uninterrupted heating. Background Technology

[0002] As a heat conversion device, heat pumps replace traditional coal-fired and gas-fired boilers and other heating equipment, significantly reducing the use of fossil fuels, improving energy efficiency, and achieving the goal of carbon reduction in the heating sector.

[0003] Existing heat pump systems are prone to frost formation during winter heating operation. The conventional defrosting method involves absorbing energy from the heating side, which leads to a significant drop in the temperature of the heating side of the unit and a poor customer experience. Utility Model Content

[0004] The technical problem to be solved by this invention is to provide a defrosting system with uninterrupted heating to address the shortcomings of the prior art. This invention uses a compressor connected in parallel and symmetrically to set up a heat exchange loop, and is equipped with two air-side heat exchangers. It makes full use of the compressor cycle, high-efficiency heating mode, cooling mode, and adopts an alternating defrosting mode. It has the advantage of achieving stable heating of the system without absorbing heat from the heating side.

[0005] The technical problem to be solved by this utility model is achieved through the following technical solution: a defrosting system for uninterrupted heating, including a compressor, with a first branch and a second branch connected in parallel at the compressor outlet, and a first four-way reversing valve, a first air-side heat exchanger and a fourth one-way valve sequentially provided on the first branch. The second branch is equipped with a second four-way reversing valve, a second air-side heat exchanger and a fifth check valve in sequence. The first branch and the second branch are connected in parallel and then connected to the main circuit through the first four-way pipe. The main circuit is connected to the compressor return port. The main circuit between the first four-way pipe and the compressor is equipped with a water-side heat exchanger, a second solenoid valve and a first solenoid valve in sequence along the return direction. An electronic expansion valve is provided on the main circuit on the other side of the first four-way pipe. The main circuit is connected in parallel with the electronic expansion valve to a first bypass pipe and a second bypass pipe. The first bypass pipe is connected to the first branch between the first air-side heat exchanger and the fourth one-way valve. The second bypass pipe is connected to the second branch between the second air-side heat exchanger and the fifth one-way valve. A sixth check valve is installed on the main circuit between the first four-way pipe and the water-side heat exchanger.

[0006] As a further embodiment of this utility model, a seventh check valve is provided on the first bypass pipeline, and an eighth check valve is provided on the second bypass pipeline.

[0007] As a further embodiment of this utility model, a fifth branch is provided in parallel at the main circuit where the sixth check valve and the electronic expansion valve are located, and a ninth check valve is provided on the fifth branch; The fifth branch is connected to the main circuit, the first bypass pipeline, and the second bypass pipeline.

[0008] As a further embodiment of this utility model, a sixth branch is provided in parallel at the main circuit where the second solenoid valve is located, and a third check valve is provided on the sixth branch.

[0009] As a further embodiment of this utility model, a second four-way pipe is provided on the main circuit between the first solenoid valve and the second solenoid valve. One end of the second four-way pipe is connected to the first four-way reversing valve through a pipeline, and the other end of the second four-way pipe is connected to the second four-way reversing valve through a pipeline.

[0010] As a further embodiment of this utility model, the first four-way reversing valve is connected to the compressor return port through the third branch, and the second four-way reversing valve is connected to the compressor return port through the fourth branch.

[0011] As a further embodiment of this utility model, both the first four-way reversing valve and the second four-way reversing valve include a D port, an E port, an S port, and a C port. The D port and the E port are connected, and the C port and the S port are connected. When the first four-way reversing valve and the second four-way reversing valve are in the open state, the D port and the C port are connected, and the E port and the S port are connected, and the first four-way reversing valve and the second four-way reversing valve are in the closed state.

[0012] As a further embodiment of this utility model, the system operates in a heating mode, a cooling mode, a first air-side heat exchanger defrosting mode, and a second air-side heat exchanger defrosting mode.

[0013] The beneficial effects of this utility model are: This utility model provides a defrosting system for uninterrupted heating, including a compressor, with a first branch and a second branch connected in parallel at the compressor outlet, and a first four-way reversing valve, a first air-side heat exchanger and a fourth one-way valve sequentially provided on the first branch. The second branch is equipped with a second four-way reversing valve, a second air-side heat exchanger and a fifth check valve in sequence. The first branch and the second branch are connected in parallel and then connected to the main circuit through the first four-way pipe. The main circuit is connected to the compressor return port. The main circuit between the first four-way pipe and the compressor is equipped with a water-side heat exchanger, a second solenoid valve and a first solenoid valve in sequence along the return direction. An electronic expansion valve is installed on the main circuit on the other side of the first four-way pipe. The main circuit is connected in parallel with the first bypass pipe and the second bypass pipe through the electronic expansion valve. A sixth check valve is installed on the main circuit between the first four-way pipe and the water-side heat exchanger.

[0014] By switching between the first and second four-way reversing valves, the system flexibly switches between heating, cooling, and defrosting modes. By controlling the flow direction of the four-way reversing valves, the system quickly switches the operating modes of the compressor, water-side heat exchanger, and air-side heat exchanger components, achieving optimal operation under different conditions. Furthermore, it ensures that the defrosting process of the first and second air-side heat exchangers does not affect the temperature of the water-side heat exchanger. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the heat pump system of the present invention; Figure 2 This is a schematic diagram of the heating mode process of the present invention; Figure 3 This is a schematic diagram of the cooling mode process of the present invention; Figure 4 This is a schematic diagram of the defrosting mode of the first air-side heat exchanger of the present invention; Figure 5 This is a schematic diagram of the defrosting mode of the second air-side heat exchanger of the present invention.

[0016] In the diagram: 1-Second bypass line, 101-Eighth check valve, 2-Main circuit, 201-Electronic expansion valve, 202-Sixth check valve, 203-Water side heat exchanger, 204-First solenoid valve, 205-Second solenoid valve, 3-Fifth branch, 301-Ninth check valve, 4-First bypass line, 401-Seventh check valve, 5-First branch, 501-Fourth check valve, 502-First air side heat exchanger, 6-Sixth branch, 601-Third check valve, 7-Third branch, 701-First four-way reversing valve, 702-First check valve, 8-Fourth branch, 801-Second check valve, 802-Second four-way reversing valve, 9-Second branch, 901-Fifth check valve, 902-Second air side heat exchanger, 10-Compressor, 11-First four-way pipe, 12-Second four-way pipe. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely for distinguishing the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] Example 1 Please see the appendix Figure 1 -Appendix Figure 2 A defrosting system for uninterrupted heating includes a compressor 10, with a first branch 5 and a second branch 9 connected in parallel at the compressor outlet. The first branch is provided with a first four-way reversing valve 701, a first air-side heat exchanger 502 and a fourth one-way valve 501 in sequence. The second branch 9 is sequentially equipped with a second four-way reversing valve 802, a second air-side heat exchanger 902, and a fifth one-way valve 901. The first four-way reversing valve 701 and the second four-way reversing valve 802 both include ports D, E, S, and C. Ports D and E are connected, and ports C and S are connected. When the first four-way reversing valve 701 and the second four-way reversing valve 802 are in the open state, ports D and C are connected, and ports E and S are connected, the first four-way reversing valve and the second four-way reversing valve are in the closed state.

[0021] After the first branch and the second branch are connected in parallel, they are connected to the main circuit 2 through the first four-way pipe 11. The main circuit is connected to the compressor return port. The main circuit between the first four-way pipe 11 and the compressor 10 is provided with a water-side heat exchanger 203, a second solenoid valve 205 and a first solenoid valve 204 in sequence along the return direction. An electronic expansion valve 201 is installed on the main circuit on the other side of the first four-way pipe 11. The main circuit is connected in parallel with the electronic expansion valve 201 to a first bypass pipe 4 and a second bypass pipe 1. The first bypass pipe 4 is connected to the first branch 5 between the first air-side heat exchanger and the fourth one-way valve 501. A seventh one-way valve 401 is installed on the first bypass pipe 4. The second bypass pipe is connected to the second branch 9 between the second air-side heat exchanger 902 and the fifth one-way valve 901. An eighth one-way valve 101 is installed on the second bypass pipe 1.

[0022] A sixth check valve 202 is provided on the main circuit between the first four-way pipe 11 and the water-side heat exchanger 203. A fifth branch 3 is connected in parallel to the main circuit where the sixth check valve 202 and the electronic expansion valve 201 are located. The fifth branch 3 is connected to the main circuit 2, the first bypass pipe 4 and the second bypass pipe 1. A ninth check valve 301 is provided on the fifth branch 3. A sixth branch 6 is connected in parallel to the main circuit where the second solenoid valve 205 is located, and a third check valve 601 is provided on the sixth branch.

[0023] A second four-way pipe 12 is provided on the main circuit between the first solenoid valve 204 and the second solenoid valve 205. One end of the second four-way pipe 12 is connected to the first four-way reversing valve 701 through a pipeline. The first four-way reversing valve 701 is connected to the compressor return port through the third branch 7. The other end of the second four-way pipe is connected to the second four-way reversing valve 802 through a pipeline. The second four-way reversing valve 802 is connected to the compressor return port through the fourth branch 8.

[0024] The operation method of the uninterrupted heating defrosting system includes heating mode, cooling mode, first air-side heat exchanger defrosting mode and second air-side heat exchanger defrosting mode. The heating mode, the system operation method includes: during heating, the compressor 10 starts, the first four-way reversing valve 701 is closed, the second four-way reversing valve 802 is closed, the first solenoid valve 204 is closed, and the second solenoid valve 205 is opened. The high-temperature and high-pressure gaseous refrigerant heated in the compressor 10 flows into the main circuit 2 through the first one-way valve 702 and the second one-way valve 801 respectively, and flows into the electronic expansion valve 201 through the second solenoid valve 205, the water-side heat exchanger 203, and the sixth one-way valve 202 in sequence. The high-temperature and high-pressure gaseous refrigerant exchanges heat with the water in the water-side heat exchanger 203 and condenses into a subcooled liquid refrigerant, and releases heat into the air through the water-side heat exchanger. The subcooled liquid refrigerant is throttled by the electronic expansion valve 201 and transformed into a low-temperature and high-pressure gas-liquid two-phase refrigerant.

[0025] After passing through the electronic expansion valve 201, the refrigerant is divided into two paths. One path passes through the seventh one-way valve 401 and the first air-side heat exchanger 502 in sequence. The low-temperature and high-pressure gas-liquid two-phase refrigerant passes through the first air-side heat exchanger 502, exchanges heat with the first air-side heat exchanger and evaporates. After absorbing heat from the atmosphere, it is transformed into a low-temperature superheated gaseous refrigerant. After flowing through the first four-way reversing valve, it flows back to the compressor 10 and circulates continuously, continuously transferring heat to the circulating water in the water-side heat exchanger 203. Another path passes through the eighth one-way valve 101 and the second air-side heat exchanger 902 in sequence. The low-temperature, high-pressure gas-liquid two-phase refrigerant passes through the second air-side heat exchanger 902, exchanges heat with the second air-side heat exchanger 902 and evaporates. After absorbing heat from the atmosphere, it is transformed into a low-temperature superheated gaseous refrigerant, flows through the second four-way reversing valve 802 and then flows back to the compressor 10, and continuously circulates, continuously transferring heat to the circulating water in the water-side heat exchanger.

[0026] Example 2 Please see the appendix Figure 3 The operation method of the uninterrupted heating defrosting system, wherein the cooling mode, the system operation method includes: during cooling, the compressor 10 starts, the first four-way reversing valve 701 opens, the second four-way reversing valve 802 opens, the first solenoid valve 204 closes, and the second solenoid valve 205 opens; The high-temperature, high-pressure gaseous refrigerant heated in the compressor 10 flows in two separate paths. One path flows through the first four-way reversing valve 701, the first air-side heat exchanger 502, and the fourth one-way valve 501 to the electronic expansion valve 201. The other path flows through the second four-way reversing valve 802, the second air-side heat exchanger 902, and the fifth one-way valve 901 to the electronic expansion valve 201.

[0027] The high-temperature and high-pressure gaseous refrigerant is condensed into subcooled liquid refrigerant through the first air-side heat exchanger 502 and the second air-side heat exchanger 902, and releases heat into the air. The subcooled liquid refrigerant is throttled by the electronic expansion valve 201 and then transformed into a low-temperature and low-pressure gas-liquid two-phase refrigerant.

[0028] The refrigerant flows through the ninth check valve 301 on the fifth branch 3 to the main circuit, and then flows back to the compressor 10 via the water-side heat exchanger 203, the third check valve 601, and the first solenoid valve 204. The gas-liquid two-phase refrigerant absorbs heat and evaporates in the water-side heat exchanger 203. After absorbing heat from the water, the refrigerant transforms into a low-temperature superheated gaseous refrigerant, which flows back to the compressor 10 for compression and continuous circulation, continuously removing heat from the water-side heat exchanger.

[0029] The circulating water in the water-side heat exchanger 203 is cooled by absorbing heat, and the low-temperature circulating water exchanges heat with the indoor air for cooling.

[0030] Example 3 Please see the appendix Figure 4The operation method of the uninterrupted heating defrosting system, the defrosting mode of the first air-side heat exchanger, the system operation method includes: compressor 10 starts, first four-way reversing valve 701 opens, second four-way reversing valve 802 closes, first solenoid valve 204 closes, and second solenoid valve 205 closes. The high-temperature, high-pressure gaseous refrigerant heated in the compressor 10 flows along the first four-way reversing valve 701, through the first air-side heat exchanger 502 and the fourth one-way valve to the electronic expansion valve 201, and then back to the compressor 10 through the eighth one-way valve 101 and the second air-side heat exchanger 902.

[0031] High-temperature, high-pressure gaseous refrigerant is condensed into subcooled liquid refrigerant in the first air-side heat exchanger 502 and releases heat to the frost layer of the first air-side heat exchanger 502. The subcooled liquid refrigerant is throttled by the electronic expansion valve 201 and transformed into low-temperature, low-pressure gas-liquid two-phase refrigerant. The low-temperature, low-pressure gas-liquid two-phase refrigerant passes through the second air-side heat exchanger 902, where it exchanges and absorbs heat to form low-temperature, low-pressure gaseous refrigerant. Finally, it flows back to the compressor 10 and circulates continuously to defrost the first air-side heat exchanger 502.

[0032] Example 4 Please see the appendix Figure 5 The operation method of the uninterrupted heating defrosting system, the defrosting mode of the second air-side heat exchanger, the system operation method includes: compressor 10 starts, first four-way reversing valve 701 closes, second four-way reversing valve 802 opens, first solenoid valve 204 closes, second solenoid valve 205 closes; The high-temperature, high-pressure gaseous refrigerant heated in the compressor 10 flows along the second four-way reversing valve 802, through the second air-side heat exchanger 902 and the fifth one-way valve to the electronic expansion valve 201, and then back to the compressor 10 through the seventh one-way valve 401 and the first air-side heat exchanger 502.

[0033] High-temperature, high-pressure gaseous refrigerant is condensed into subcooled liquid refrigerant by the second air-side heat exchanger 902 and releases heat to the frost layer of the second air-side heat exchanger 902. The subcooled liquid refrigerant is throttled by the electronic expansion valve 201 and transformed into low-temperature, low-pressure gas-liquid two-phase refrigerant. The low-temperature, low-pressure gas-liquid two-phase refrigerant passes through the first air-side heat exchanger 502, where it exchanges and absorbs heat to form low-temperature, low-pressure gaseous refrigerant. Finally, it flows back to the compressor and circulates continuously to defrost the second air-side heat exchanger 902.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A defrosting system for uninterrupted heating, characterized in that, Includes a compressor (10), with a first branch (5) and a second branch (9) connected in parallel at the compressor outlet. The first branch is provided with a first four-way reversing valve (701), a first air-side heat exchanger (502) and a fourth one-way valve (501) in sequence. The second branch (9) is provided with a second four-way reversing valve (802), a second air-side heat exchanger (902) and a fifth one-way valve (901) in sequence. The first branch (5) and the second branch (9) are connected in parallel and then connected to the main circuit (2) through the first four-way pipe (11). The main circuit is connected to the compressor return port. The main circuit between the first four-way pipe and the compressor is provided with a water-side heat exchanger (203), a second solenoid valve (205) and a first solenoid valve (204) in sequence along the return direction. An electronic expansion valve (201) is provided on the main circuit on the other side of the first four-way pipe (11). The main circuit is connected in parallel with the electronic expansion valve (201) to a first bypass pipe (4) and a second bypass pipe (1). The first bypass pipe (4) is connected to the first branch (5) between the first air-side heat exchanger (502) and the fourth check valve (501). The second bypass pipe (1) is connected to the second branch (9) between the second air-side heat exchanger (902) and the fifth check valve (901). A sixth check valve (202) is provided on the main circuit between the first four-way pipe (11) and the water-side heat exchanger (203).

2. The uninterrupted heating defrosting system according to claim 1, characterized in that: The first bypass pipeline (4) is equipped with a seventh check valve (401), and the second bypass pipeline (1) is equipped with an eighth check valve (101).

3. The uninterrupted heating defrosting system according to claim 2, characterized in that: The fifth branch (3) is connected in parallel with the main circuit where the sixth check valve (202) and the electronic expansion valve (201) are located, and the ninth check valve (301) is provided on the fifth branch. The fifth branch (3) is connected to the main circuit (2), the first bypass pipeline (4) and the second bypass pipeline (1).

4. The uninterrupted heating defrosting system according to claim 3, characterized in that: A sixth branch (6) is connected in parallel to the main circuit where the second solenoid valve (205) is located, and a third check valve (601) is provided on the sixth branch.

5. The uninterrupted heating defrosting system according to claim 4, characterized in that: A second four-way pipe (12) is provided on the main circuit between the first solenoid valve (204) and the second solenoid valve (205). One end of the second four-way pipe (12) is connected to the first four-way reversing valve (701) through a pipeline, and the other end of the second four-way pipe (12) is connected to the second four-way reversing valve (802) through a pipeline.

6. The uninterrupted heating defrosting system according to claim 5, characterized in that: The first four-way reversing valve (701) is connected to the compressor return port through the third branch (7), and the second four-way reversing valve (802) is connected to the compressor return port through the fourth branch (8).

7. The uninterrupted heating defrosting system according to claim 6, characterized in that: The first four-way directional valve (701) and the second four-way directional valve (802) both include port D, port E, port S and port C. Ports D and E are connected and ports C and S are connected. The first four-way directional valve and the second four-way directional valve are in the open state. Ports D and C are connected and ports E and S are connected. The first four-way directional valve and the second four-way directional valve are in the closed state.

8. The uninterrupted heating defrosting system according to claim 7, characterized in that, The system operates in heating mode, cooling mode, first air-side heat exchanger defrosting mode, and second air-side heat exchanger defrosting mode.

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