Refrigerant heat dissipation system of variable frequency heat pump device

Abstract

The utility model relates to a kind of refrigerant heat dissipation systems of frequency conversion heat pump equipment, its characteristics include evaporator, four-way valve, gas-liquid separator, compressor, condenser, one-way valve group, frequency conversion drive module, capillary, solenoid valve, liquid accumulator, economizer and auxiliary road electronic expansion valve;One-way valve group includes first one-way valve, second one-way valve, third one-way valve and fourth one-way valve;Auxiliary road electronic expansion valve is communicated with first one-way valve and second one-way valve with economizer, and first one-way valve is communicated with third one-way valve and evaporator respectively.The advantage is that active temperature control is realized using system itself low-temperature refrigerant, without additional energy-consuming equipment;Avoiding supercooling condensation risk, protecting electronic device;Significantly reduce the temperature of drive module (measured reduction can reach 15 to 30 DEG C);Simple structure, only increase capillary and solenoid valve, cost controllable.

Description

Technical Field

[0001] This utility model relates to a refrigerant heat dissipation system for a variable frequency heat pump device. Background Technology

[0002] With the increasing popularity of variable frequency heat pumps, the heat dissipation of their core electronic power devices (such as IGBT modules) has become a key bottleneck for the reliability of heat pump systems. Current mainstream heat dissipation solutions suffer from the following shortcomings:

[0003] 1. The fundamental flaws of air-cooled heat dissipation solutions

[0004] Noise pollution: The operating noise of the high-speed fan is >65dB(A), which is difficult to meet the quiet requirements of residential buildings;

[0005] Low reliability: mechanical failure rate as high as 23% / year (industry statistics), average lifespan <30,000 hours;

[0006] Poor environmental adaptability: Dust accumulation leads to a decrease in heat dissipation efficiency of >40%, and high humidity environments cause circuit corrosion.

[0007] 2. Systemic contradictions in refrigerant heat dissipation solutions

[0008] Structural limitations lead to heat dissipation failure in certain operating conditions:

[0009] The electronic expansion valve must be placed downstream of the refrigerant heat dissipation module to ensure that the refrigerant flowing through the module is in a pre-throttling state, preventing overcooling and condensation from damaging the circuit.

[0010] Cooling mode: The refrigerant flows to the compressor → evaporator → refrigerant heat dissipation module → electronic expansion valve → condenser. The heat dissipation module is located on the medium-temperature and high-pressure side and can cool normally.

[0011] Heating mode: Due to the presence of the one-way valve assembly, the refrigerant flow direction is reversed to compressor → condenser → refrigerant heat dissipation module → electronic expansion valve → evaporator. The heat dissipation module is also located on the high-pressure side. However, when the unit operates under high-temperature heating conditions, such as when the ambient temperature is >35℃ and the outlet water temperature is >70℃, and the condensing temperature is >80℃, the temperature of the refrigerant flowing through the heat dissipation module exceeds the IGBT's heat dissipation limit (the maximum allowable cooling medium temperature is <70℃), failing to effectively cool the drive module and causing the module to overheat and shut down. Current solutions include: 1. Simply increasing the radiator area or using forced air cooling will increase noise and energy consumption; 2. Using an auxiliary refrigeration circuit is costly and the system is complex. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of the prior art and provide a refrigerant heat dissipation system for variable frequency heat pump equipment. It uses the system's own low-temperature refrigerant to achieve active temperature control without the need for additional energy-consuming equipment; it avoids the risk of overcooling and condensation, protecting electronic components; it significantly reduces the temperature of the drive module (the measured reduction can reach 15 to 30°C); the structure is simple, only requiring the addition of a capillary tube and a solenoid valve, and the cost is controllable.

[0013] To achieve the above objectives, the present invention is implemented as follows: it is a refrigerant heat dissipation system for a variable frequency heat pump device, including an evaporator, a four-way valve, a gas-liquid separator, and a compressor; the outlet of the evaporator is connected to end a of the four-way valve, end b of the four-way valve is connected to the exhaust port of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the return port of the compressor.

[0014] The system comprises a condenser, a check valve assembly, a variable frequency drive module, a capillary tube, and a solenoid valve. The check valve assembly includes a first check valve, a second check valve, a third check valve, and a fourth check valve. The C-end of the four-way valve is connected to the inlet of the condenser. The outlet of the condenser is connected to the outlets of the second and third check valves, respectively. The outlet of the third check valve is connected to the variable frequency drive module and one end of the capillary tube. The other end of the capillary tube is connected to one end of the solenoid valve, and the other end of the solenoid valve is connected to the return port of the compressor.

[0015] The system includes a liquid receiver, an economizer, and an auxiliary electronic expansion valve. The other end of the variable frequency drive module is connected to the inlet of the liquid receiver. The outlet of the liquid receiver is connected to port b of the economizer. Port a of the economizer is connected to the compressor's gas supply port. Port c of the economizer is connected to one end of the auxiliary electronic expansion valve. The other end of the auxiliary electronic expansion valve and port d of the economizer are respectively connected to the inlets of the first and second check valves. The outlet of the first check valve is respectively connected to the inlet of the third check valve and the inlet of the evaporator.

[0016] This technical solution also includes a main electronic expansion valve. The other end of the economizer's port d and the auxiliary electronic expansion valve are respectively connected to one end of the main electronic expansion valve. The other end of the main electronic expansion valve is connected to the inlet of the first check valve and the inlet of the second check valve.

[0017] The advantages of this invention compared to existing technologies are: active temperature control is achieved using the system's own low-temperature refrigerant, eliminating the need for additional energy-consuming equipment; it avoids the risk of overcooling and condensation, protecting electronic components; it significantly reduces the temperature of the drive module (the measured temperature reduction can reach 15 to 30°C); and its simple structure, requiring only the addition of a capillary tube and a solenoid valve, keeps costs under control. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the system principle of this utility model. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] In the description of this utility model, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0021] In this utility model, unless otherwise explicitly specified and limited, the term "set" and other terms should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or a detachable arrangement or an integral part; it can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0022] like Figure 1 As shown, it is a refrigerant cooling system for a variable frequency heat pump device, characterized by including:

[0023] Evaporator 1, four-way valve 2, gas-liquid separator 13, compressor 11; the outlet of the evaporator 1 is connected to end a of the four-way valve 2, end b of the four-way valve 2 is connected to the exhaust port of the gas-liquid separator 13, and the outlet of the gas-liquid separator 13 is connected to the return port of the compressor 11.

[0024] The system comprises a condenser 3, a one-way valve assembly 6, a variable frequency drive module 4, a capillary tube 5, and a solenoid valve 12. The one-way valve assembly 6 includes a first one-way valve 61, a second one-way valve 62, a third one-way valve 63, and a fourth one-way valve 64. The c-end of the four-way valve 2 is connected to the inlet of the condenser 3. The outlet of the condenser 3 is connected to the outlet of the second one-way valve 62 and the outlet of the third one-way valve 63. The outlet of the third one-way valve 63 is connected to the variable frequency drive module 4 and one end of the capillary tube 5. The other end of the capillary tube 5 is connected to one end of the solenoid valve 12. The other end of the solenoid valve 12 is connected to the return port of the compressor 11.

[0025] The system includes a liquid receiver 10, an economizer 9, and an auxiliary electronic expansion valve 8. The other end of the variable frequency drive module 4 is connected to the inlet of the liquid receiver 10. The outlet of the liquid receiver 10 is connected to port b of the economizer 9. Port a of the economizer 9 is connected to the gas supply port of the compressor 11. Port c of the economizer 9 is connected to one end of the auxiliary electronic expansion valve 8. The other end of the auxiliary electronic expansion valve 8 and port d of the economizer 9 are connected to the inlet of the first one-way valve 61 and the inlet of the second one-way valve 62, respectively. The outlet of the first one-way valve 61 is connected to the inlet of the third one-way valve 63 and the inlet of the evaporator 1, respectively.

[0026] The low-temperature refrigerant is throttled through capillary tube 5 by the return pipe and then mixed with the high-temperature refrigerant entering the variable frequency drive module 4, which significantly reduces the temperature of the cooling medium. The solenoid valve 12 is used to intelligently open and close under high-temperature conditions, which solves the problem of overheating of the drive module caused by high condensation temperature. At the same time, it strictly avoids the refrigerant from overcooling and condensing. This solution has a simple structure and low cost.

[0027] Active temperature control is achieved using the system's own low-temperature refrigerant, eliminating the need for additional energy-consuming equipment; it avoids the risk of overcooling and condensation, protecting electronic components; it significantly reduces the temperature of the drive module (measured reduction can reach 15 to 30°C); the structure is simple, requiring only the addition of a capillary tube and a solenoid valve, keeping costs under control.

[0028] In this embodiment, a main electronic expansion valve 7 is also included. The other end of the d port of the economizer 9 and the auxiliary electronic expansion valve 8 are respectively connected to one end of the main electronic expansion valve 7. The other end of the main electronic expansion valve 7 is connected to the inlet of the first check valve 61 and the inlet of the second check valve 62.

[0029] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations of these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. A refrigerant cooling system for a variable frequency heat pump device, characterized in that... include Evaporator (1), four-way valve (2), gas-liquid separator (13) and compressor (11); the outlet of the evaporator (1) is connected to end a of the four-way valve (2), end b of the four-way valve (2) is connected to the exhaust port of the gas-liquid separator (13), and the outlet of the gas-liquid separator (13) is connected to the return port of the compressor (11). The condenser (3), one-way valve group (6), variable frequency drive module (4), capillary tube (5) and solenoid valve (12); the one-way valve group (6) includes a first one-way valve (61), a second one-way valve (62), a third one-way valve (63) and a fourth one-way valve (64); the c end of the four-way valve (2) is connected to the inlet of the condenser (3), the outlet of the condenser (3) is connected to the outlet of the second one-way valve (62) and the outlet of the third one-way valve (63) respectively, the outlet of the third one-way valve (63) is connected to one end of the variable frequency drive module (4) and the capillary tube (5) respectively, the other end of the capillary tube (5) is connected to one end of the solenoid valve (12), and the other end of the solenoid valve (12) is connected to the return port of the compressor (11); The system includes a liquid receiver (10), an economizer (9), and an auxiliary electronic expansion valve (8). The other end of the variable frequency drive module (4) is connected to the inlet of the liquid receiver (10), the outlet of the liquid receiver (10) is connected to port b of the economizer (9), port a of the economizer (9) is connected to the air supply port of the compressor (11), port c of the economizer (9) is connected to one end of the auxiliary electronic expansion valve (8), the other end of the auxiliary electronic expansion valve (8) and port d of the economizer (9) are connected to the inlet of the first check valve (61) and the inlet of the second check valve (62), respectively, and the outlet of the first check valve (61) is connected to the inlet of the third check valve (63) and the inlet of the evaporator (1), respectively.

2. The refrigerant cooling system of the variable frequency heat pump equipment according to claim 1, characterized in that... It also includes a main electronic expansion valve (7), the other end of the d port of the economizer (9) and the other end of the auxiliary electronic expansion valve (8) are respectively connected to one end of the main electronic expansion valve (7), and the other end of the main electronic expansion valve (7) is connected to the inlet of the first check valve (61) and the inlet of the second check valve (62).

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