Variable-frequency and fixed-frequency power adjustable water chilling unit

Abstract

The utility model relates to the technical field of cooling-water machines, in particular to a variable-frequency and fixed-frequency power-adjustable cooling-water unit which comprises a fixed-frequency compressor unit and a variable-frequency compressor unit, the fixed-frequency compressor unit is connected with a first condensation pipeline, the variable-frequency compressor unit is connected with a second condensation pipeline, the first condensation pipeline comprises a first heat exchanger, and the second condensation pipeline comprises a second heat exchanger. The water inlet pipe is connected with the water tank, and the water tank is connected with the water return pipe. The constant-frequency compressor unit comprises a plurality of constant-frequency compressors, the variable-frequency compressor unit comprises a plurality of variable-frequency compressors, cold water generated by a first condensation pipeline of the constant-frequency compressor unit is conveyed to the working system through a water outlet pipe, and water of the working system flows back into the water tank to be temporarily stored. The variable-frequency compressor unit is started, the cold water amount is adjusted by controlling the number and power of variable-frequency compressors, and the requirement of a working system is met.

Description

Technical Field

[0001] The utility model relates to the technical field of chillers, in particular to a variable-frequency plus fixed-frequency power-adjustable chiller unit. Background Technique

[0002] Chiller units are important refrigeration equipment in central air-conditioning systems and are widely used in commercial buildings, industrial production, and other occasions that require a large amount of cooling. Their main function is to reduce the water temperature through a refrigeration cycle, so as to provide cold air for buildings or cool other equipment.

[0003] When designing a chiller unit system, the combined use of multiple units is usually considered, or a variable-frequency compressor is used to adjust the power. However, the adjustable power of the variable-frequency compressor is small and cannot cope with scenarios with large changes in working conditions.

[0004] Therefore, in view of the above problems, a variable-frequency plus fixed-frequency power-adjustable chiller unit is proposed to solve the above problems. Content of the Utility Model

[0005] In view of the deficiencies of the prior art, the utility model develops a variable-frequency plus fixed-frequency power-adjustable chiller unit, which can adjust the working power of the chiller unit in a large range.

[0006] The technical solution for the utility model to solve the technical problem is: a variable-frequency plus fixed-frequency power-adjustable chiller unit, including a fixed-frequency compressor unit and a variable-frequency compressor unit. The fixed-frequency compressor unit is connected to the first condensation pipeline, and the variable-frequency compressor unit is connected to the second condensation pipeline. The first condensation pipeline includes a first heat exchanger, and the second condensation pipeline includes a second heat exchanger. Both the first heat exchanger and the second heat exchanger are connected to a water inlet pipe and a water outlet pipe. The water inlet pipe is connected to a water tank, and the water tank is connected to a return water pipe.

[0007] The fixed-frequency compressor unit includes multiple fixed-frequency compressors, and the variable-frequency compressor unit includes multiple variable-frequency compressors. The cold water generated by the first condensation pipeline of the fixed-frequency compressor unit is transported to the working system through the water outlet pipe. The water of the working system flows back into the water tank for temporary storage. When the refrigeration power of the fixed-frequency compressor unit cannot meet the requirements of the working system, the variable-frequency compressor unit is started, and the cold water volume is adjusted by controlling the number and power of the variable-frequency compressors to meet the needs of the working system. Using multiple variable-frequency compressors to form a variable-frequency compressor unit expands the power adjustment range of the chiller unit and is more suitable for the changing demand of the working system for cold water.

[0008] Preferably, the first condensation pipeline further includes a first condenser, a first radiator fan, a first liquid receiver, and a first filter. The fixed-frequency compressor unit is connected to the first condenser. The first radiator fan is arranged on the first condenser. The first condenser is connected to the first liquid receiver. The first liquid receiver is connected to the first filter. The first filter is connected to the first heat exchanger.

[0009] The first condenser and the first radiator fan cooperate to release heat from the high-temperature and high-pressure gaseous refrigerant. By setting up the first filter, the circulating medium is filtered to remove metal debris and other impurities in the circulating medium.

[0010] Preferably, the first condensation pipeline further includes a first suction gas pipeline and a first gas-liquid separator. The first heat exchanger and the fixed-frequency compressor unit are connected through the first suction gas pipeline, and a first gas-liquid separator is arranged on the first suction gas pipeline.

[0011] By setting up the first suction gas pipeline and the gas-liquid separator, the low-temperature and low-pressure gaseous circulating medium is transported to the fixed-frequency compressor unit to form a cycle.

[0012] Preferably, a first safety valve for the refrigeration system is arranged on the first liquid storage tank, and a plurality of valve groups are arranged on the pipeline between the first filter and the first heat exchanger. The valve group includes a liquid supply solenoid valve and a thermostatic expansion valve. The liquid supply solenoid valve is at one end close to the first filter, and the thermostatic expansion valve is arranged at one end close to the first heat exchanger.

[0013] By setting up the thermostatic expansion valve, throttling from the condensation pressure to the evaporation pressure is achieved, and at the same time, the flow rate of the circulating medium is controlled.

[0014] Preferably, the second condensation pipeline further includes a second condenser, a second radiator fan, a second liquid storage tank and a second filter. The variable-frequency compressor unit is connected to the second condenser, a second radiator fan is arranged on the second condenser, the second condenser is connected to the second liquid storage tank, the second liquid storage tank is connected to the second filter, and the second filter is connected to the second heat exchanger.

[0015] The first condenser and the first radiator fan cooperate to release heat from the high-temperature and high-pressure gaseous refrigerant. By setting up the first filter, the circulating medium is filtered to remove metal debris and other impurities in the circulating medium.

[0016] Preferably, the second condensation pipeline further includes a second suction gas pipeline and a second gas-liquid separator. The second heat exchanger and the variable-frequency compressor unit are connected through the second suction gas pipeline, and a second gas-liquid separator is arranged on the second suction gas pipeline.

[0017] Preferably, a second safety valve for the refrigeration system is arranged on the second liquid storage tank, and an electronic expansion valve is arranged on the pipeline between the first filter and the first heat exchanger.

[0018] The effects provided in the utility model content are only the effects of the embodiments, rather than all the effects of the utility model. The above technical solutions have the following advantages or beneficial effects:

[0019] The fixed-frequency compressor unit includes multiple fixed-frequency compressors, and the variable-frequency compressor unit includes multiple variable-frequency compressors. The cold water generated by the first condensation pipeline of the fixed-frequency compressor unit is transported to the working system through the water outlet pipe, and the water of the working system flows back into the water tank for temporary storage. When the refrigeration power of the fixed-frequency compressor unit cannot meet the requirements of the working system, the variable-frequency compressor unit is started, and the cold water volume is adjusted by controlling the number and power of the variable-frequency compressors to meet the needs of the working system. Using multiple variable-frequency compressors to form a variable-frequency compressor unit expands the power adjustment range of the chiller and is more suitable for the changing demand of the working system for cold water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0021] Figure 1 It is a schematic connection diagram of the present invention.

[0022] In the figure, 1. Fixed-frequency compressor unit; 2. Variable-frequency compressor unit; 3. First heat exchanger; 4. Second heat exchanger; 5. Water inlet pipe; 6. Water outlet pipe; 7. Water tank; 8. Return pipe; 9. First condenser; 10. First radiator fan; 11. First liquid receiver; 12. First filter; 13. First return air pipe; 14. First gas-liquid separator; 15. First refrigeration system safety valve; 16. Liquid supply solenoid valve; 17. Thermostatic expansion valve; 18. Second condenser; 19. Second radiator fan; 20. Second liquid receiver; 21. Second filter; 22. Second return air pipe; 23. Second gas-liquid separator; 24. Second refrigeration system safety valve; 25. Electronic expansion valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] In order to clearly illustrate the technical features of this solution, the following will elaborate on the present utility model in detail through specific embodiments and in conjunction with its accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. In addition, the present utility model may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. The present utility model omits the description of well-known components, processing technologies, and processes to avoid unnecessarily limiting the present utility model. The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] As Figure 1 shown, a variable-frequency plus fixed-frequency power-adjustable chiller includes a fixed-frequency compressor unit 1 and a variable-frequency compressor unit 2. The fixed-frequency compressor unit 1 is connected to the first condensation pipeline, and the variable-frequency compressor unit 2 is connected to the second condensation pipeline. The first condensation pipeline includes a first heat exchanger 3, and the second condensation pipeline includes a second heat exchanger 4. Both the first heat exchanger 3 and the second heat exchanger 4 are connected to a water inlet pipe 5 and a water outlet pipe 6. The water inlet pipe 5 is connected to a water tank 7, and the water tank 7 is connected to a return pipe 8. The fixed-frequency compressor unit 1 includes multiple fixed-frequency compressors, and the variable-frequency compressor unit 2 includes multiple variable-frequency compressors. The cold water generated by the first condensation pipeline of the fixed-frequency compressor unit 1 is transported to the working system through the water outlet pipe 6. The water of the working system flows back into the water tank 7 for temporary storage. When the refrigeration power of the fixed-frequency compressor unit 1 cannot meet the requirements of the working system, the variable-frequency compressor unit 2 is started, and the cold water volume is adjusted by controlling the number and power of the variable-frequency compressors to meet the needs of the working system. Using multiple variable-frequency compressor units 2 as the variable-frequency compressor unit 2 expands the power adjustment range of the chiller and is more suitable for the changing demand of the working system for cold water.

[0025] The first condensation pipeline further includes a first condenser 9, a first radiator fan 10, a first liquid storage device 11 and a first filter 12. The fixed-frequency compressor unit 1 is connected to the first condenser 9. The first radiator fan 10 is arranged on the first condenser 9. The first condenser 9 is connected to the first liquid storage device 11. The first liquid storage device 11 is connected to the first filter 12. The first filter 12 is connected to the first heat exchanger 3. The first condenser 9 and the first radiator fan 10 cooperate to release heat from the high-temperature and high-pressure gaseous refrigerant. By arranging the first filter 12, the circulating medium is filtered, and metal debris and other impurities in the circulating medium are filtered.

[0026] The first condensation pipeline further includes a first return air pipe 13 and a first gas-liquid separator 14. The first heat exchanger 3 and the fixed-frequency compressor unit 1 are connected through the first return air pipe 13. The first gas-liquid separator 14 is arranged on the first return air pipe 13. By arranging the first return air pipe 13 and the gas-liquid separator, the low-temperature and low-pressure gaseous circulating medium is transported to the fixed-frequency compressor unit 1 to form a cycle.

[0027] A first refrigeration system safety valve 15 is arranged on the first liquid storage device 11. A plurality of valve groups are arranged on the pipeline between the first filter 12 and the first heat exchanger 3. The valve group includes a liquid supply solenoid valve 16 and a thermostatic expansion valve 17. One end of the liquid supply solenoid valve 16 is close to the first filter 12, and the thermostatic expansion valve 17 is arranged at one end close to the first heat exchanger 3. By arranging the thermostatic expansion valve 17, throttling from the condensation pressure to the evaporation pressure is realized, and at the same time, the flow rate of the circulating medium is controlled.

[0028] The second condensation pipeline further includes a second condenser 18, a second radiator fan 19, a second liquid storage device 20 and a second filter 21. The variable-frequency compressor unit 2 is connected to the second condenser 18. The second radiator fan 19 is arranged on the second condenser 18. The second condenser 18 is connected to the second liquid storage device 20. The second liquid storage device 20 is connected to the second filter 21. The second filter 21 is connected to the second heat exchanger 4. The first condenser 9 and the first radiator fan 10 cooperate to release heat from the high-temperature and high-pressure gaseous refrigerant. By arranging the first filter 12, the circulating medium is filtered, and metal debris and other impurities in the circulating medium are filtered.

[0029] The second condensation pipeline further includes a second return air pipe 22 and a second gas-liquid separator 23. The second heat exchanger 4 and the variable-frequency compressor unit 2 are connected through the second return air pipe 22. The second gas-liquid separator 23 is arranged on the second return air pipe 22.

[0030] A second refrigeration system safety valve 24 is arranged on the second liquid storage device 20. An electronic expansion valve 25 is arranged on the pipeline between the first filter 12 and the first heat exchanger 3.

[0031] Working principle: The cold water generated by the first condensation pipeline of the fixed-frequency compressor unit 1 is transported to the working system through the water outlet pipe 6, and the water of the working system flows back into the water tank 7 for temporary storage. When the refrigeration power of the fixed-frequency compressor unit 1 cannot meet the requirements of the working system, the variable-frequency compressor unit 2 is started, and the cold water volume is adjusted by controlling the number and power of the variable-frequency compressors to meet the needs of the working system.

[0032] Although the specific implementation manners of the utility model are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the utility model. Based on the technical solutions of the utility model, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the utility model.

Claims

1. A variable-frequency plus fixed-frequency power-adjustable chiller, characterized in that: It includes a fixed-frequency compressor unit (1) and a variable-frequency compressor unit (2). The fixed-frequency compressor unit (1) is connected to a first condensation pipeline, and the variable-frequency compressor unit (2) is connected to a second condensation pipeline. The first condensation pipeline includes a first heat exchanger (3), and the second condensation pipeline includes a second heat exchanger (4). Both the first heat exchanger (3) and the second heat exchanger (4) are connected to a water inlet pipe (5) and a water outlet pipe (6). The water inlet pipe (5) is connected to a water tank (7), and the water tank (7) is connected to a return pipe (8).

2. The variable-frequency plus fixed-frequency power-adjustable water chiller according to claim 1, wherein: The first condensation pipeline further includes a first condenser (9), a first radiator fan (10), a first liquid receiver (11), and a first filter (12). The fixed-frequency compressor unit (1) is connected to the first condenser (9). A first radiator fan (10) is arranged on the first condenser (9). The first condenser (9) is connected to the first liquid receiver (11). The first liquid receiver (11) is connected to the first filter (12). The first filter (12) is connected to the first heat exchanger (3).

3. The variable-frequency plus fixed-frequency power-adjustable chiller according to claim 2, characterized in that: The first condensation pipeline further includes a first return air duct (13) and a first gas-liquid separator (14). The first heat exchanger (3) and the fixed-frequency compressor unit (1) are connected through the first return air duct (13), and the first gas-liquid separator (14) is arranged on the first return air duct (13).

4. A variable-frequency plus fixed-frequency power-adjustable chiller according to claim 2, characterized in that: A first refrigeration system safety valve (15) is arranged on the first liquid receiver (11). A plurality of valve groups are arranged on the pipeline between the first filter (12) and the first heat exchanger (3). The valve group includes a liquid supply solenoid valve (16) and a thermostatic expansion valve (17). One end of the liquid supply solenoid valve (16) is close to the first filter (12), and the thermostatic expansion valve (17) is arranged at one end close to the first heat exchanger (3).

5. A variable-frequency plus fixed-frequency power-adjustable chiller according to claim 1, characterized in that: The second condensation pipeline further includes a second condenser (18), a second radiator fan (19), a second liquid receiver (20), and a second filter (21). The variable-frequency compressor unit (2) is connected to the second condenser (18). A second radiator fan (19) is arranged on the second condenser (18). The second condenser (18) is connected to the second liquid receiver (20). The second liquid receiver (20) is connected to the second filter (21). The second filter (21) is connected to the second heat exchanger (4).

6. A variable-frequency plus fixed-frequency power-adjustable water chiller according to claim 5, characterized in that: The second condensation pipeline further includes a second return air duct (22) and a second gas-liquid separator (23). The second heat exchanger (4) and the variable-frequency compressor unit (2) are connected through the second return air duct (22), and the second gas-liquid separator (23) is arranged on the second return air duct (22).

7. A variable-frequency plus fixed-frequency power-adjustable chiller according to claim 5, characterized in that: A second refrigeration system safety valve (24) is arranged on the second liquid receiver (20). An electronic expansion valve (25) is arranged on the pipeline between the first heat exchanger (3) and the first filter (12).

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