Water chilling unit with variable-frequency and fixed-frequency compressor and air conditioning equipment

Abstract

The utility model relates to the technical field of water chilling units, in particular to a water chilling unit with variable-frequency and fixed-frequency compressors and air conditioning equipment, which comprises a main cooling water channel and an auxiliary cooling water channel, the main cooling water channel comprises a plurality of fixed-frequency compressors, and the auxiliary cooling water channel comprises a variable-frequency compressor. The main cooling water channel and the auxiliary cooling water channel are jointly connected with the working system and the water storage tank. The auxiliary cooling water channel is started, the fixed-frequency compressors of different numbers are started according to the cooling water amount required by the working system, then the power of the variable-frequency compressor is adjusted according to the required power, the power required by the working system is achieved, the requirements of the working system can be met, and energy waste can be avoided. Cooling water generated by the main cooling water channel and the auxiliary cooling water channel enters the working system, backflow water generated in the working system firstly enters the water storage tank, then the water flow is distributed through the water storage tank, and the cooling water manufacturing efficiency of the arrangement system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chillers, in particular to a chiller with a variable-frequency and fixed-frequency compressor and an air-conditioning device. Background Art

[0002] Chillers are widely used in various building and industrial fields. For example, in large shopping malls, public buildings, factories, hotels and other places, chillers can provide efficient refrigeration services.

[0003] During actual use, a chiller usually adopts one compressor. For example, the patent with the publication number CN215176350U discloses a high-temperature chiller, which adopts one compressor. However, when the working conditions change, the compressor power of this compression unit cannot be adjusted, which is likely to cause energy waste. When the working conditions change greatly, a variable-frequency compressor is usually adopted. For example, the patent with the publication number CN205014671U discloses a chiller, which uses a variable-frequency compressor to adjust the power. However, the power of a single variable-frequency compressor is limited, and it is likely to have insufficient refrigeration when facing a large cooling water demand.

[0004] Therefore, in view of the above problems, a chiller with a variable-frequency and fixed-frequency compressor and an air-conditioning device are proposed to solve the above problems. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model develops a chiller with a variable-frequency and fixed-frequency compressor and an air-conditioning device, which can meet the cooling water demand of the working system and avoid energy waste.

[0006] The technical solution for the utility model to solve the technical problems is as follows: A chiller with a variable-frequency and fixed-frequency compressor includes a main cooling water circuit and an auxiliary cooling water circuit. The main cooling water circuit includes multiple fixed-frequency compressors, and the auxiliary cooling water circuit includes a variable-frequency compressor. The main cooling water circuit and the auxiliary cooling water circuit are jointly connected to a working system and a water storage tank.

[0007] Start the auxiliary cooling water circuit, start different numbers of fixed-frequency compressors according to the cooling water volume required by the working system, and then adjust the power of the variable-frequency compressor according to the required power to reach the power required by the working system, which can not only meet the requirements of the working system but also avoid energy waste.

[0008] Preferably, the main cooling water circuit includes a first delivery pipe, a first condenser, a first infusion pipe, a first return air pipe and a first heat exchanger. Multiple fixed-frequency compressors are connected to the first delivery pipe, the first delivery pipe is connected to the first condenser, the first condenser is connected to the first infusion pipe, the first infusion pipe is connected to the first heat exchanger, the first heat exchanger is connected to the first return air pipe, and the first return air pipe is connected to multiple fixed-frequency compressors.

[0009] The fixed-frequency compressor compresses the circulating medium into a high-temperature and high-pressure gas state and transports it to the first condenser for cooling treatment. The cooled circulating medium is transported to the first heat exchanger for heat exchange in the first heat exchanger to cool the cooling water. After heat exchange, the circulating medium returns to the fixed-frequency compressor through the first return pipe to complete the cycle.

[0010] Preferably, the main cooling water circuit further includes a check valve, a first liquid storage device, a first filter, a liquid supply solenoid valve, a thermostatic expansion valve, and a first gas-liquid separator. The fixed-frequency compressor is connected to the first delivery pipe through the check valve. A first liquid storage device and a first filter are provided on the first liquid delivery pipe. Multiple liquid supply solenoid valves are provided near the first heat exchanger on the first liquid delivery pipe. The liquid supply solenoid valve is connected to the thermostatic expansion valve. A first gas-liquid separator is provided on the first return pipe.

[0011] A check valve is provided in the fixed-frequency compressor to prevent the circulating medium from flowing back when multiple fixed-frequency compressors work simultaneously. By providing the first liquid storage device and the first filter, the pressure of the circulating medium is reduced, and at the same time, impurities in the circulating medium are filtered out to prevent pipeline blockage. By providing multiple groups of liquid supply solenoid valves and thermostatic expansion valves, a throttling effect is achieved, and at the same time, the relatively large power when multiple fixed-frequency transformers are turned on simultaneously is dealt with.

[0012] Preferably, the auxiliary cooling water circuit includes a second delivery pipe, a second condenser, a second liquid delivery pipe, a second return pipe, and a second heat exchanger. The variable-frequency compressor is connected to the second delivery pipe. The second delivery pipe is connected to the second condenser. The second condenser is connected to the second heat exchanger through the second liquid delivery pipe. The second heat exchanger is connected to the variable-frequency compressor through the second return pipe.

[0013] Preferably, the auxiliary cooling water circuit further includes a second liquid storage device, a second filter, an electronic expansion valve, and a second gas-liquid separator. A second liquid storage device and a second filter are provided on the second liquid delivery pipe. An electronic expansion valve is provided near the second heat exchanger on the second liquid delivery pipe. A second gas-liquid separator is provided on the second return pipe.

[0014] Preferably, the first heat exchanger is provided with a first liquid outlet and a first return port, and the second heat exchanger is provided with a second liquid outlet and a second return port. The first liquid outlet and the second liquid outlet are both connected to the water inlet pipe of the working system. The first return port and the second return port are both connected to the water delivery pipe. The water delivery pipe is connected to the water storage tank. The water storage tank is connected to the return pipe of the working system.

[0015] The cooling water generated by the main cooling water circuit and the auxiliary cooling water circuit both enter the working system. The return water generated in the working system first enters the water storage tank, and the water flow is distributed through the water storage tank to improve the efficiency of manufacturing cooling water of the entire system.

[0016] The present utility model further provides an air-conditioning device, and the air-conditioning device includes the above-mentioned chiller.

[0017] The effects provided in the description of the utility model 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:

[0018] Start the auxiliary cooling water circuit, start different numbers of fixed-frequency compressors according to the cooling water volume required by the working system, and then adjust the power of the variable-frequency compressor according to the required power to reach the power required by the working system, which can not only meet the needs of the working system but also avoid waste of energy.

[0019] The cooling water generated by the main cooling water circuit and the auxiliary cooling water circuit both enter the working system. The return water generated in the working system first enters the water storage tank, and the water flow is distributed through the water storage tank to improve the manufacturing cooling water efficiency of the finishing system. Description of the Drawings

[0020] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model.

[0021] Figure 1 It is a system diagram of the present utility model.

[0022] Figure 2 It is a schematic connection diagram of the main cooling water circuit of the present utility model.

[0023] Figure 3 It is a schematic connection diagram of the auxiliary cooling water circuit of the present utility model.

[0024] In the figure, 1, fixed-frequency compressor; 2, variable-frequency compressor; 3, water storage tank; 4, first delivery pipe; 5, first condenser; 6, first infusion pipe; 7, first return air pipe; 8, first heat exchanger; 9, one-way valve; 10, first liquid storage device; 11, first filter; 12, liquid supply solenoid valve; 13, thermostatic expansion valve; 14, first gas-liquid separator; 15, second delivery pipe; 1, second condenser; 17, second infusion pipe; 18, second return air pipe; 19, second heat exchanger; 20, second liquid storage device; 21, second filter; 22, electronic expansion valve; 23, second gas-liquid separator; 24, first liquid outlet; 25, first return port; 26, second liquid outlet; 27, second return port; 28, water inlet pipe; 29, water delivery pipe; 30, return pipe. Detailed Embodiments

[0025] 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 orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood 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.

[0026] As Figures 1 to 3 shown, a water chiller with a variable-frequency plus fixed-frequency compressor includes a main cooling water circuit and an auxiliary cooling water circuit. The main cooling water circuit includes multiple fixed-frequency compressors 1, and the auxiliary cooling water circuit includes a variable-frequency compressor 2. The main cooling water circuit and the auxiliary cooling water circuit are jointly connected to the working system and the water storage tank 3. Start the auxiliary cooling water circuit, start different numbers of fixed-frequency compressors 1 according to the cooling water volume required by the working system, and then adjust the power of the variable-frequency compressor 2 according to the required power to reach the power required by the working system, which can not only meet the requirements of the working system but also avoid waste of energy.

[0027] The main cooling water circuit includes a first delivery pipe 4, a first condenser 5, a first liquid delivery pipe 6, a first return gas pipe 7, and a first heat exchanger 8. A plurality of fixed-frequency compressors 1 are connected to the first delivery pipe 4. The first delivery pipe 4 is connected to the first condenser 5. The first condenser 5 is connected to the first liquid delivery pipe 6. The first liquid delivery pipe 6 is connected to the first heat exchanger 8. The first heat exchanger 8 is connected to the first return gas pipe 7. The first return gas pipe 7 is connected to a plurality of fixed-frequency compressors 1. The fixed-frequency compressors 1 compress the circulating medium into a high-temperature and high-pressure gas state and deliver it to the first condenser 5 for cooling treatment. The cooled circulating medium is delivered to the first heat exchanger 8 for heat exchange in the first heat exchanger 8 to cool the cooling water. The circulating medium after heat exchange returns to the fixed-frequency compressors 1 through the first return gas pipe 7 to complete the cycle.

[0028] The main cooling water circuit further includes a check valve 9, a first liquid accumulator 10, a first filter 11, a liquid supply solenoid valve 12, a thermostatic expansion valve 13, and a first gas-liquid separator 14. The fixed-frequency compressor 1 is connected to the first delivery pipe 4 through the check valve 9. A first liquid accumulator 10 and a first filter 11 are provided on the first liquid delivery pipe 6. A plurality of liquid supply solenoid valves 12 are provided on the first liquid delivery pipe 6 near the first heat exchanger 8. The liquid supply solenoid valve 12 is connected to the thermostatic expansion valve 13. A first gas-liquid separator 14 is provided on the first return gas pipe 7. A check valve 9 is provided on the fixed-frequency compressor 1 to prevent the circulating medium from flowing back when a plurality of fixed-frequency compressors 1 work simultaneously. By providing the first liquid accumulator 10 and the first filter 11, the pressure of the circulating medium is reduced, and at the same time, impurities in the circulating medium are filtered out to prevent blockage of the pipeline. By providing multiple groups of liquid supply solenoid valves 12 and thermostatic expansion valves 13, a throttling effect is achieved, and at the same time, the relatively large power when multiple fixed-frequency transformers are turned on simultaneously is dealt with.

[0029] The auxiliary cooling water circuit includes a second delivery pipe 15, a second condenser 16, a second liquid delivery pipe 17, a second return gas pipe 18, and a second heat exchanger 19. The variable-frequency compressor 2 is connected to the second delivery pipe 15. The second delivery pipe 15 is connected to the second condenser 16. The second condenser 16 is connected to the second heat exchanger 19 through the second liquid delivery pipe 17. The second heat exchanger 19 is connected to the variable-frequency compressor 2 through the second return gas pipe 18.

[0030] The auxiliary cooling water circuit further includes a second liquid accumulator 20, a second filter 21, an electronic expansion valve 22, and a second gas-liquid separator 23. A second liquid accumulator 20 and a second filter 21 are provided on the second liquid delivery pipe 17. An electronic expansion valve 22 is provided on the second liquid delivery pipe 17 near the second heat exchanger 19. A second gas-liquid separator 23 is provided on the second return gas pipe 18.

[0031] The first heat exchanger 8 is provided with a first liquid outlet 24 and a first return port 25, and the second heat exchanger 19 is provided with a second liquid outlet 26 and a second return port 27. The first liquid outlet 24 and the second liquid outlet 26 are both connected to the water inlet pipe 28 of the working system, and the first return port 25 and the second return port 27 are both connected to the water delivery pipe 29. The water delivery pipe 29 is connected to the water storage tank 3, and the water storage tank 3 is connected to the return pipe 30 of the working system. The cooling water generated by the main cooling water path and the auxiliary cooling water path all enters the working system. The return water generated in the working system first enters the water storage tank 3, and the water flow is distributed again through the water storage tank 3, improving the manufacturing cooling water efficiency of the finishing system.

[0032] The present utility model also provides an air conditioning device, which includes the above-mentioned water chiller.

[0033] Working principle: Start the main cooling water path of multiple fixed-frequency compressors 1 according to the amount of cooling water required by the working system, and at the same time start the auxiliary cooling water path of the variable-frequency compressor 2 to supplement the main cooling water path through the auxiliary cooling water path of the variable-frequency compressor 2.

[0034] Although the specific implementation manners of the utility model are described in conjunction with the drawings above, it is not a limitation to the protection scope of the present utility model. Based on the technical solutions of the present 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 present utility model.

Claims

1. A water chiller with a variable-frequency and fixed-frequency compressor, characterized in that: It includes a main cooling water circuit and an auxiliary cooling water circuit. The main cooling water circuit includes multiple fixed-frequency compressors (1), and the auxiliary cooling water circuit includes a variable-frequency compressor (2). The main cooling water circuit and the auxiliary cooling water circuit are jointly connected to the working system and the water storage tank (3).

2. The water chiller with a variable-frequency and fixed-frequency compressor according to claim 1, wherein: The main cooling water circuit includes a first delivery pipe (4), a first condenser (5), a first liquid delivery pipe (6), a first return air pipe (7), and a first heat exchanger (8). Multiple fixed-frequency compressors (1) are connected to the first delivery pipe (4), the first delivery pipe (4) is connected to the first condenser (5), the first condenser (5) is connected to the first liquid delivery pipe (6), the first liquid delivery pipe (6) is connected to the first heat exchanger (8), the first heat exchanger (8) is connected to the first return air pipe (7), and the first return air pipe (7) is connected to multiple fixed-frequency compressors (1).

3. The water chiller with a variable-frequency plus fixed-frequency compressor according to claim 2, characterized in that: The main cooling water circuit further includes a check valve (9), a first liquid accumulator (10), a first filter (11), a liquid supply solenoid valve (12), a thermostatic expansion valve (13), and a first gas-liquid separator (14). The fixed-frequency compressor (1) is connected to the first delivery pipe (4) through the check valve (9). A first liquid accumulator (10) and a first filter (11) are arranged on the first liquid delivery pipe (6). Multiple liquid supply solenoid valves (12) are arranged near the first heat exchanger (8) on the first liquid delivery pipe (6). The liquid supply solenoid valve (12) is connected to the thermostatic expansion valve (13). A first gas-liquid separator (14) is arranged on the first return air pipe (7).

4. A water chiller with a variable-frequency and fixed-frequency compressor according to claim 2, characterized in that: The auxiliary cooling water circuit includes a second delivery pipe (15), a second condenser (16), a second liquid delivery pipe (17), a second return air pipe (18), and a second heat exchanger (19). The variable-frequency compressor (2) is connected to the second delivery pipe (15), the second delivery pipe (15) is connected to the second condenser (16), the second condenser (16) is connected to the second heat exchanger (19) through the second liquid delivery pipe (17), and the second heat exchanger (19) is connected to the variable-frequency compressor (2) through the second return air pipe (18).

5. A water chiller with a variable-frequency and fixed-frequency compressor according to claim 4, characterized in that: The auxiliary cooling water circuit further includes a second liquid accumulator (20), a second filter (21), an electronic expansion valve (22), and a second gas-liquid separator (23). A second liquid accumulator (20) and a second filter (21) are arranged on the second liquid delivery pipe (17). An electronic expansion valve (22) is arranged near the second heat exchanger (19) on the second liquid delivery pipe (17). A second gas-liquid separator (23) is arranged on the second return air pipe (18).

6. A water chiller with a variable-frequency and fixed-frequency compressor according to claim 4, characterized in that: The first heat exchanger (8) is provided with a first liquid outlet (24) and a first return port (25). The second heat exchanger (19) is provided with a second liquid outlet (26) and a second return port (27). The first liquid outlet (24) and the second liquid outlet (26) are both connected to the water inlet pipe (28) of the working system. The first return port (25) and the second return port (27) are both connected to the water delivery pipe (29). The water delivery pipe (29) is connected to the water storage tank (3). The water storage tank (3) is connected to the return pipe (30) of the working system.

7. An air conditioning device, characterized in that: Including a water chiller with a variable-frequency plus fixed-frequency compressor as described in any one of claims 1 to 6.

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