Heat pump air conditioner alternating defrosting system
Patent Information
- Application Number
- CN202522260621.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-27
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-10-27
AI Technical Summary
[0003]目前除霜的核心原理非常直接，即暂时将系统的热量流向反转，让室外机变“热”，从而融化霜层，可以理解为，除霜就是让系统在短时间内进入“夏天制冷模式”，把室内的热量“搬运”到室外机去化霜，所以在除霜的时候设备必须停止制热模式，此种系统设置在冬季是会给使用者造成困扰
[0011]本实用新型的有益效果是：本实用新型在现有空气能热泵或者空调流路的基础上，在冷凝器的入口端并联设置有两个进液流路，每个进液流路上分别设置有控制开关，在两个进液流路之间设置有连接管并在连接管中部通过一根导热管与压缩机连接，所述的连接管上在连接管左右两侧分设一个分支开关实现连个进液流路的独立控制，通过此种结构设置，在进行除霜时，一个进液流路继续参与制热，另一个进液流路与压缩机直连将压缩机中热量导流至冷凝器中进行除霜。通过此种多个进液流路交替除霜实现在整个制热系统不停机或者在制热状态下实现有效的除霜。
Smart Images
Figure CN224887382U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of air source or air conditioning defrosting technology, and in particular to a heat pump air conditioning alternating defrosting system. Background Technology
[0002] In existing technologies, whether it's an air source heat pump unit or a regular air conditioning system, the outdoor unit acts as an evaporator (absorbing heat from the outdoor air) during winter heating. When the outdoor temperature is low (usually below 2℃~6℃) and the air humidity is high, the surface temperature of the outdoor unit's heat exchanger will be lower than the air's dew point temperature and 0℃. This causes water vapor in the air flowing through the heat exchanger to condense and form frost. This frost layer covers the aluminum fins of the heat exchanger, forming an insulation layer that severely hinders heat exchange between the air and the refrigerant, leading to reduced heat absorption efficiency, insufficient heating, and even a lack of noticeable warmth indoors. If the frost layer is too thick, it may cause abnormal system pressure, eventually triggering protection and shutting down the system. Therefore, to ensure the normal operation of the equipment, regularly and effectively removing the frost layer is crucial for ensuring the stable and efficient operation of the air source heat pump.
[0003] The core principle of defrosting is very straightforward: temporarily reverse the heat flow of the system, making the outdoor unit "hot" and thus melting the frost layer. It can be understood that defrosting is to put the system into "summer cooling mode" for a short time, "transferring" the heat from the room to the outdoor unit to defrost. Therefore, the equipment must stop heating mode during defrosting, which can cause inconvenience to users in winter.
[0004] Considering the above-mentioned drawbacks of the existing technology, the technical problem that urgently needs to be solved by those skilled in the art is: how to improve the technology and design a heat pump air conditioner alternating defrosting system, with the aim of achieving defrosting without stopping the machine during winter heating. Summary of the Invention
[0005] In order to achieve the above-mentioned technical objectives, this utility model develops a heat pump air conditioner alternating defrosting system, which divides the flow path into at least two paths at the condenser inlet end. When one path is defrosting, at least one path is retained to achieve heating circulation.
[0006] The technical solution adopted is as follows: A heat pump air conditioning alternating defrosting system includes an indoor heat exchanger, a condenser, a compressor, and a liquid receiver; the indoor heat exchanger, condenser, and compressor are connected through four ports on a four-way valve. A low-pressure switch and a gas-liquid separator are installed between the compressor and the S-port of the four-way valve, and a high-pressure switch is installed between the compressor and the D-port of the four-way valve. A liquid receiver is connected to the rear side of the indoor heat exchanger, and the liquid receiver and filter are connected to the condenser. The key design feature of this invention is that two liquid inlet paths are connected in parallel at the inlet end of the condenser, and a control switch is installed on each liquid inlet path. A connecting pipe is installed between the two liquid inlet paths, and a heat-conducting pipe is connected to the compressor in the middle of the connecting pipe. A branch switch is installed on the left and right sides of the connecting pipe to realize independent control of the two liquid inlet paths.
[0007] An economizer and control valve I are provided on the front side of the liquid inlet flow path, which connect the liquid inlet flow path and the compressor to one unit, enabling gas replenishment and enthalpy increase in the heating cycle.
[0008] The economizer is equipped with filters on both the front and rear sides for filtering the liquid entering the condenser and exiting the economizer.
[0009] A gas-liquid separator is installed between the compressor and the four-way valve.
[0010] The condenser is internally equipped with multiple partitions that match the number of liquid inlet flow paths, enabling simultaneous local defrosting and local heating.
[0011] The beneficial effects of this utility model are as follows: Based on the existing air source heat pump or air conditioner flow path, this utility model sets up two liquid inlet flow paths in parallel at the inlet end of the condenser. Each liquid inlet flow path is equipped with a control switch. A connecting pipe is set between the two liquid inlet flow paths, and a heat-conducting pipe is connected to the compressor in the middle of the connecting pipe. A branch switch is set on the left and right sides of the connecting pipe to realize independent control of the two liquid inlet flow paths. With this structure, during defrosting, one liquid inlet flow path continues to participate in heating, while the other liquid inlet flow path is directly connected to the compressor to guide the heat in the compressor to the condenser for defrosting. Through this alternating defrosting by multiple liquid inlet flow paths, effective defrosting can be achieved without stopping the entire heating system or even while in heating mode. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the system connection structure of this utility model; Figure 2 This is a schematic diagram of the defrosting structure of this utility model. Figure I ; Figure 3 This is a schematic diagram of the defrosting structure of this utility model. Figure II ; Reference numerals: 1. Condenser, 2. Indoor heat exchanger, 21. Liquid inlet path, 22. Connecting pipe, 3. Compressor, 4. Four-way valve, 5. Gas-liquid separator, 6. Liquid receiver, 7. Economizer, 71. Control valve I, 72. Control valve II, 8. Filter I, 9. Filter II, 10. Solenoid valve I, 11. Solenoid valve II, 12. Solenoid valve III, 13. Solenoid valve IV, 14. Condenser probe, 15. Defrost probe, 16. Low-pressure switch, 17. Heat pipe, 18. Exhaust probe, 19. High-pressure switch, 20. Outdoor fan. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to 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 scope of the present utility model.
[0014] Example 1: As shown in the attached diagram, a heat pump air conditioning alternating defrosting system, which is identical to the components of existing air source heat pump equipment, includes an indoor heat exchanger 2, a condenser 1, a compressor 3, and a liquid receiver 6. The indoor heat exchanger 2, condenser 1, and compressor 3 are connected via four ports on a four-way valve 4. A low-pressure switch 16 and a gas-liquid separator 5 are installed between the compressor 3 and the S port of the four-way valve 4, and a high-pressure switch 19 is installed between the compressor 3 and the D port of the four-way valve 4. The liquid receiver 6 is connected to the rear of the indoor heat exchanger 2, and the condenser 1 is connected via the liquid receiver 6 and a filter. There are two filters, namely filter I 8 and filter II 9. The condenser 1 is also equipped with a condenser probe 14 and a defrost probe 15.
[0015] The key design feature of this invention is that two liquid inlet flow paths 21 are connected in parallel at the inlet end of the condenser 1. Each liquid inlet flow path 21 is equipped with a solenoid valve III 12 and a solenoid valve IV 13. A connecting pipe 22 is provided between the two liquid inlet flow paths 21, and a heat-conducting pipe 17 is connected to the compressor 3 in the middle of the connecting pipe 22. Solenoid valves I 10 and II 11 are respectively provided on the left and right sides of the connecting pipe 22. The solenoid valves I 10 and II 11 are used as branch switches to realize the independent control of the two liquid inlet flow paths 21.
[0016] An economizer 7 and a control valve I 71 are provided on the front side of the liquid inlet flow path, which respectively connect the liquid inlet flow path and the compressor 3 to one unit, and can realize gas replenishment and enthalpy increase in the heating cycle.
[0017] The economizer 7 is provided with filter I 8 and filter II 9 on its front and rear sides, respectively. The two filters are used to filter the liquid entering and exiting the economizer 7 and to filter the liquid entering the condenser 1.
[0018] Furthermore, the condenser 1 is internally equipped with multiple partitions that match the number of liquid inlet flow paths, enabling simultaneous local defrosting and local heating.
[0019] In non-defrosting mode, the entire heating process is the same as the heating process in the prior art. The solenoid valves I10 and II11 on both sides of the connecting pipe 22 are all closed, and the heating medium is transported into the condenser 1 through the two liquid inlet flow paths 21 to achieve normal heating.
[0020] Example 2: like Figure 2 As shown, in defrost mode, the solenoid valve IV13 on the right side of the two liquid inlet flow paths 21 is closed, while the solenoid valve III12 on the left side is open. Solenoid valve I10 on the connecting pipe 22 is closed, and solenoid valve II11 is open. At this time, the medium participating in the heating cycle is guided to the condenser 1 through solenoid valve III12 in the liquid inlet flow path 21 to achieve heating. The exhaust temperature of the compressor 3 is 80–90 degrees Celsius. The high temperature from the compressor 3 is guided into the condenser 1 through solenoid valve II11 via the connecting pipe 22 for defrosting. Thus, defrosting and heating are performed simultaneously without shutting down the compressor.
[0021] Example 3: like Figure 3 As shown, in defrost mode, the solenoid valve IV13 on the right side of the two liquid inlet flow paths 21 is open, while the solenoid valve III12 on the left side is closed. The solenoid valve I10 on the connecting pipe 22 is open, and the solenoid valve II11 is closed. At this time, the medium participating in the heating cycle is guided to the condenser 1 through solenoid valve IV13 in the liquid inlet flow path 21 to achieve heating. The exhaust temperature of the compressor 3 is 80–90 degrees Celsius. The high temperature from the compressor 3 is guided into the condenser 1 through solenoid valve I10 via the connecting pipe 22 for defrosting. Thus, defrosting and heating are performed simultaneously without shutting down the compressor.
[0022] The above embodiments 1, 2 and 3 can be used in air source heat pump units and ordinary air conditioning systems. The core principle is to select two circuits to perform internal defrosting of condenser 1. As described in embodiment 1, multiple partitions can be set inside condenser 1 to match the number of liquid inlet flow paths, so as to realize local defrosting and local heating at the same time. Multiple liquid inlet flow paths correspond to multiple solenoid valve switches to realize local defrosting of condenser. By alternating defrosting through the above multiple liquid inlet flow paths, effective defrosting can be achieved in the entire heating system without stopping or in the heating state.
Claims
1. A heat pump air conditioning alternating defrosting system, comprising an indoor heat exchanger, a condenser, a compressor, and a liquid receiver; the indoor heat exchanger, condenser, and compressor are connected via four ports on a four-way valve; A low-pressure switch and a gas-liquid separator are installed between the compressor and the S port of the four-way valve, and a high-pressure switch is installed between the compressor and the D port of the four-way valve; a liquid receiver is connected to the rear side of the indoor heat exchanger, and the liquid receiver and filter are connected to the condenser, characterized in that: Two liquid inlet paths are connected in parallel at the inlet end of the condenser. Each liquid inlet path is equipped with a control switch. A connecting pipe is provided between the two liquid inlet paths and a heat-conducting pipe is used to connect the connecting pipe to the compressor in the middle. A branch switch is provided on the left and right sides of the connecting pipe to realize independent control of the two liquid inlet paths.
2. The heat pump air conditioning alternating defrosting system according to claim 1, characterized in that: An economizer and control valve I are provided on the front side of the liquid inlet flow path, which connect the liquid inlet flow path and the compressor to one unit, enabling gas replenishment and enthalpy increase in the heating cycle.
3. The heat pump air conditioning alternating defrosting system according to claim 2, characterized in that: The economizer is equipped with filters on both the front and rear sides.
4. The heat pump air conditioning alternating defrosting system according to claim 1, characterized in that: A gas-liquid separator is installed between the compressor and the four-way valve.
5. The heat pump air conditioning alternating defrosting system according to claim 1, characterized in that: The condenser is internally configured with multiple partitions that match the number of liquid inlet flow paths.