Liquid-cooled multi-heat-source variable frequency heat pump unit and system

Abstract

The utility model relates to new energy technology field especially, and relates to a kind of liquid-cooled multi-heat source frequency conversion heat pump unit and system. To solve the frequency converter of the frequency conversion compressor of traditional heat dissipation mode is mostly in air-cooled mode, heat dissipation efficiency is not enough at high power, noise is big, dust accumulation affects reliability and other problems, the utility model is provided with electric ball valve 3 and electric ball valve 4 on the refrigerant pipeline of unit, is provided with frequency converter liquid cooling heat sink on frequency converter, the frequency converter of frequency conversion compressor is contacted with frequency converter liquid cooling heat sink and can carry out heat conduction, then the heat of frequency converter is taken away by refrigerant of heat pump unit low-pressure side, to realize unit operation COP promotion, stable operation, long-term operation cost is low, and the technical effects, such as safe operation.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a liquid-cooled multi-heat source variable frequency heat pump unit and system. Background Technology

[0002] The most common type of heat pump unit in existing technology is the traditional single-heat-source heat pump unit. The problem with this type of unit is that the efficiency of a single heat source decays relatively quickly, especially under different temperature conditions, resulting in poor applicability and low efficiency. While multi-heat-source heat pump units also exist, using inverter compressors, the inverters are mostly air-cooled for heat dissipation. This results in insufficient heat dissipation efficiency at high power, high noise levels, and dust accumulation affecting reliability.

[0003] Therefore, it is clear that there is an urgent need for a heat pump unit that can improve the heat dissipation efficiency of the inverter in a multi-heat source heat pump unit, so as to ensure the efficient and safe operation of the heat pump unit. Utility Model Content

[0004] To address the various problems existing in traditional solutions, this utility model provides a liquid-cooled multi-heat-source variable frequency heat pump unit, which includes a variable frequency compressor, a four-way valve, a gas-liquid separator, an economizer, an air-cooled finned evaporator, a low-temperature water source subsystem, a variable frequency liquid-cooled heat sink, a condenser, a liquid receiver, a plate heat exchanger, and a terminal system. The variable frequency compressor, four-way valve, gas-liquid separator, economizer, air-cooled finned evaporator, condenser, liquid receiver, and plate heat exchanger are interconnected via refrigerant pipelines. Electric ball valves 3 and 4 are installed on the refrigerant pipelines. Electric ball valves 3 and 4 are connected to the liquid-cooled heat sink of the variable frequency drive via pipelines. The liquid-cooled heat sink of the variable frequency drive is in contact with the variable frequency drive of the variable frequency compressor and can conduct heat.

[0005] Furthermore, a one-way valve is provided on the pipeline between the electric ball valve 3 and the electric ball valve 4 and the liquid cooling heat sink of the frequency converter.

[0006] Furthermore, the unit is also equipped with electric ball valve 1 and electric ball valve 2.

[0007] Furthermore, the low-temperature water source subsystem includes one or more of a waste heat device, a water tank, and a cooling tower.

[0008] Furthermore, the plate heat exchanger is a single-channel plate heat exchanger or a double-channel plate heat exchanger.

[0009] This utility model also provides a liquid-cooled multi-heat source variable frequency heat pump unit system, the system including two sets of the aforementioned units, wherein the plate heat exchanger is a dual-channel plate heat exchanger, and the two sets of units are arranged in parallel and share a low-temperature water source subsystem.

[0010] This utility model adopts a complementary multi-heat source form to prevent the efficiency decay of a single heat source. Through intelligent mode switching, the unit's operating COP is improved, and the comprehensive energy efficiency ratio can reach 5~8, which is much higher than that of traditional air conditioning systems. It can still operate stably under extreme climate conditions, and take into account multiple needs such as heating, cooling, and domestic hot water. It avoids the high initial installation cost of a single heat source and has low long-term operating costs. The large amount of heat generated when the frequency converter starts can be carried away by the refrigerant, which effectively ensures the safe operation of the frequency converter compressor. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the unit structure of Embodiment 1 or 2 disclosed in this utility model.

[0013] 1-Electric ball valve 1; 2-Electric ball valve 2; 3-Water source electronic expansion valve; 4-Variable frequency compressor; 5-Air-cooled finned evaporator; 6-Condenser; 7-Main circuit electronic expansion valve; 8-Auxiliary circuit electronic expansion valve; 9-Water source pump; 10-Air conditioning pump; 11-Terminal system; 12-Dual-channel plate heat exchanger; 13-Water tank; 14-Waste heat treatment device; 15-Four-way valve; 16-Gas-liquid separator; 17-Liquid receiver; 18-Solenoid valve; 19-Condensate flow switch; 20-Evaporator flow switch; 21-Cooling tower; 22-Electric ball valve 3; 23-Electric ball valve 4; 24-Check valve 1; 25-Check valve 2; 26-Check valve 3; 27-Check valve 4; 28-Check valve 5; 29-Economy unit; 30-Variable frequency drive liquid cooling plate Detailed Implementation The structure and operation of this utility model patent will be further described in detail below with reference to the accompanying drawings. Obviously, the drawings are provided only for better understanding of this utility model patent and should not be construed as limiting this utility model patent. Based on the embodiments of this utility model patent, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

[0014] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] Example 1 Combination Figure 1 As shown, this embodiment discloses a liquid-cooled multi-heat-source variable frequency heat pump unit, which includes a variable frequency compressor 4, a four-way valve 15, a gas-liquid separator 16, an economizer 29, an air-cooled finned evaporator 5, a low-temperature water source subsystem, a variable frequency liquid-cooled heat sink 30, a condenser 6, a liquid receiver 17, a plate heat exchanger 12, and a terminal system 11.

[0017] The variable frequency compressor 4, four-way valve 15, gas-liquid separator 16, economizer 29, air-cooled finned evaporator 5, condenser 6, liquid receiver 17, and plate heat exchanger 12 are interconnected via refrigerant pipelines. Electric ball valves 3 (numbered 22) and 4 (numbered 23) are installed on the refrigerant pipelines. Electric ball valves 3 and 4 are connected to the variable frequency liquid cooling plate 30 via pipelines. The variable frequency liquid cooling plate 30 is in contact with the variable frequency compressor 4 and can conduct heat.

[0018] Specifically, a check valve is installed on the pipeline between the electric ball valve 3 and the electric ball valve 4 and the inverter liquid cooling heat sink 30, as an auxiliary... Figure 1 Components numbered 24, 25, 26, and 27.

[0019] The heat generated by the compressor inverter is conducted to the inverter liquid cooling heat sink 30. The refrigerant on the low-pressure side of the unit passes through electric ball valves 3 and 4, then through a check valve and flows through the inverter liquid cooling heat sink 30, thereby carrying away the heat and cooling the inverter.

[0020] Specifically, the unit is also equipped with an electric ball valve 1, numbered 1, and an electric ball valve 2, numbered 2.

[0021] Specifically, the low-temperature water source subsystem includes one or more of the following: waste heat device 14, water tank 13, and cooling tower 21.

[0022] Specifically, the plate heat exchanger is a single-channel plate heat exchanger or a double-channel plate heat exchanger.

[0023] The liquid-cooled multi-heat-source variable frequency heat pump unit disclosed in this utility model includes three subsystems: a waste heat device circulation subsystem, a water source heat pump circulation subsystem, an air source circulation subsystem, and a variable frequency drive liquid-cooled heat dissipation plate subsystem.

[0024] The waste heat device circulation subsystem mainly consists of waste heat device 14, water tank 13, plate heat exchanger, etc. In the waste heat device circulation section, circulating water or ethylene glycol solution is used as the heat transfer medium to exchange heat and rise in temperature in the waste heat device. The high-temperature medium flows into the heat exchanger for heat exchange under the action of the water source pump or directly enters the terminal radiator to release heat. After releasing heat, it returns to the waste heat device, forming a closed circulation loop.

[0025] The water source heat pump circulation subsystem mainly consists of a water tank 13, a plate heat exchanger, a water source heat pump, and a solenoid valve 1. During the heating season, the refrigerant inside the heat pump unit absorbs heat from the low-grade heat source in the water tank 13 through the plate heat exchanger. As it flows through the variable frequency compressor 4, the compressor performs work, increasing the heat level and allowing it to enter the condenser 6 where it condenses into a liquid state. A large amount of heat is released during condensation, thus achieving the purpose of heating the terminal system 11. Priority is given to utilizing the heat from the waste heat recovery device.

[0026] The air source heat pump circulation subsystem mainly consists of an air-cooled finned evaporator 5 and a solenoid valve 2. During the heating season, the refrigerant inside the heat pump unit absorbs heat from the air through the air-cooled finned evaporator 5. When it flows through the variable frequency compressor 4, the compressor performs work, and the heat is increased. It then enters the condenser 6 and condenses into a liquid state. A large amount of heat is released during the condensation process, thereby achieving the purpose of heating the terminal system 11.

[0027] During the startup of the variable frequency compressor 4 in the heat pump unit, the inverter of the inverter generates a large amount of heat. The low-pressure side of the refrigeration system is used for refrigerant evaporation cooling, which effectively reduces the heat of the inverter and ensures the efficient and stable operation of the unit.

[0028] The technical effect achieved by this embodiment is: (1) High efficiency and energy saving: Multiple heat sources complement each other to reduce the efficiency decay of a single heat source. Through intelligent mode switching, the unit's operating COP is improved, and the comprehensive energy efficiency ratio can reach 5~8, which is much higher than that of traditional air conditioning systems.

[0029] (2) More adaptable: It can still operate stably under extreme climates (such as combining solar energy, industrial waste heat, and water / ground source heat pumps in extremely cold regions), and take into account multiple needs such as heating, cooling, and domestic hot water.

[0030] (3) Economic optimization of diversified investment: avoid the high initial installation cost of a single heat source.

[0031] (4) Low long-term operating costs: Energy consumption costs are reduced by switching heat sources.

[0032] Example 2 This utility model also provides a liquid-cooled multi-heat source variable frequency heat pump unit system, the system including two sets of units as described in Embodiment 1, wherein the plate heat exchanger is a dual-channel plate heat exchanger 12, and the two sets of units are arranged in parallel and share a low-temperature water source subsystem.

[0033] The above embodiments are only used to illustrate this utility model patent. The structure, connection method and manufacturing process of each component can be changed. All equivalent transformations and improvements made on the basis of this technical solution should not be excluded from the protection scope of this utility model patent.

Claims

1. A liquid-cooled multi-heat-source variable frequency heat pump unit, characterized in that: The unit includes a variable frequency compressor (4), a four-way valve (15), a gas-liquid separator (16), an economizer (29), an air-cooled finned evaporator (5), a low-temperature water source subsystem, a variable frequency liquid-cooled heat sink (30), a condenser (6), a liquid receiver (17), a plate heat exchanger (12), and a terminal system (11). The variable frequency compressor (4), four-way valve (15), gas-liquid separator (16), economizer (29), air-cooled finned evaporator (5), condenser (6), liquid receiver (17), and plate heat exchanger (12) are interconnected by refrigerant pipelines. Electric ball valve 3 (22) and electric ball valve 4 (23) are installed on the refrigerant pipelines. The electric ball valve 3 (22) and electric ball valve 4 (23) are connected to the variable frequency liquid cooling heat sink (30) through pipelines. The variable frequency liquid cooling heat sink (30) is in contact with the variable frequency compressor (4) and can conduct heat.

2. The unit according to claim 1, characterized in that: A one-way valve is provided on the pipeline between the electric ball valve 3 (22) and the electric ball valve 4 (23) and the inverter liquid cooling heat sink (30).

3. The unit according to claim 1, characterized in that: The unit is also equipped with an electric ball valve 1 (1) and an electric ball valve 2 (2).

4. The unit according to claim 1, characterized in that: The low-temperature water source subsystem includes one or more of the following: waste heat device (14), water tank (13), and cooling tower (21).

5. The unit according to claim 1, characterized in that: The plate heat exchanger is either a single-channel plate heat exchanger or a double-channel plate heat exchanger.

6. A liquid-cooled multi-heat-source variable frequency heat pump unit system, characterized in that: The system includes two sets of units as described in claim 1, wherein the plate heat exchanger is a dual-channel plate heat exchanger, and the two sets of units are arranged in parallel and share a low-temperature water source subsystem.

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