Air-cooled screw four-pipe all-in-one unit

Abstract

The utility model relates to the technical field of heat exchange, in particular to an air-cooled screw four-pipe all-in-one unit which comprises a compressor, a four-way electromagnetic valve, an air side heat exchanger, a cold water heat exchanger, a hot water heat exchanger, a refrigeration electric expansion valve, a heating electric expansion valve and a defrosting electromagnetic valve. The liquid outlet end of the compressor communicates with the first communicating end of the four-way electromagnetic valve, the liquid inlet end of the compressor communicates with the third communicating end of the four-way electromagnetic valve and the liquid outlet end of the cold water heat exchanger, and the second communicating end of the four-way electromagnetic valve communicates with the liquid inlet end of the air side heat exchanger. And a fourth communication end of the four-way electromagnetic valve is communicated with a liquid inlet end of the hot water heat exchanger. The utility model aims to provide an air-cooled screw four-pipe integrated unit which has the characteristics of integration of multiple functions, high efficiency, energy conservation, simplified structure and strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, specifically to an integrated air-cooled screw four-pipe unit. Background Technology

[0002] With increasingly stringent requirements for building energy conservation and environmental protection, the energy efficiency and multifunctionality of air conditioning systems have become a focus of industry attention. Traditional air conditioning systems typically employ a single cooling or heating mode, failing to simultaneously meet the cooling and heating needs of different areas, leading to energy waste and low operating efficiency. Furthermore, existing air-cooled screw chillers are prone to frosting in low-temperature environments, affecting heat exchange efficiency, and the oil and gas-liquid separation in the refrigerant cycle is ineffective, resulting in poor oil return to the compressor, impacting system stability and lifespan.

[0003] Therefore, there is an urgent need for an air-cooled screw chiller unit that can operate efficiently, adapt to various working conditions, and has good defrosting and separation functions. Summary of the Invention

[0004] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide an integrated air-cooled screw four-pipe unit with the characteristics of multi-functional integration, high efficiency and energy saving, simplified structure and strong adaptability.

[0005] This utility model is achieved through the following technical solution:

[0006] An air-cooled screw compressor four-pipe integrated unit includes a compressor, a four-way solenoid valve, an air-side heat exchanger, a chilled water heat exchanger, a hot water heat exchanger, a refrigeration electric expansion valve, a heating electric expansion valve, and a defrost solenoid valve. The liquid outlet of the compressor is connected to the first connecting end of the four-way solenoid valve; the liquid inlet of the compressor is connected to the third connecting end of the four-way solenoid valve and the liquid outlet of the chilled water heat exchanger; the second connecting end of the four-way solenoid valve is connected to the liquid inlet of the air-side heat exchanger; the fourth connecting end of the four-way solenoid valve is connected to the liquid inlet of the hot water heat exchanger; the liquid outlet of the air-side heat exchanger is connected to one end of the heating electric expansion valve; the other end of the heating electric expansion valve is connected to one end of the defrost solenoid valve and the liquid inlet of the chilled water heat exchanger; and the other end of the defrost solenoid valve is connected to the liquid outlet of the hot water heat exchanger.

[0007] The air-cooled screw compressor four-pipe integrated unit also includes an oil separator and a gas-liquid separator. The gas-liquid separator is connected between the liquid inlet end of the compressor and the third connection end of the four-way solenoid valve, and the oil separator is connected between the liquid outlet end of the compressor and the first connection end of the four-way solenoid valve.

[0008] The compressor is also equipped with a high-low pressure switch between its inlet and outlet ends.

[0009] The heating electric expansion valve is connected in sequence to the outlet end of the hot water heat exchanger by a first angle valve, a drying filter, a second angle valve, and a liquid storage tank.

[0010] One-way valves are connected between the outlet end of the hot water heat exchanger and the storage tank, between the second connection end of the four-way solenoid valve and the inlet end of the compressor, and between the outlet end of the cold water heat exchanger and the inlet end of the compressor.

[0011] The beneficial effects of this utility model are:

[0012] This utility model discloses an integrated air-cooled screw compressor four-pipe unit. Through the coordinated operation of a four-way solenoid valve, a chilled water heat exchanger, a hot water heat exchanger, a refrigeration electric expansion valve, a heating electric expansion valve, and a defrost solenoid valve, it achieves rapid switching between multiple modes such as cooling, heating, and defrosting. It can simultaneously meet the cooling and heating needs of different areas, significantly improve energy utilization efficiency, and reduce energy waste. In addition, by adding a defrost solenoid valve, it effectively solves the problems of poor oil return from the compressor and frosting in low-temperature environments, improves the stability and low-temperature adaptability of the system, extends the service life of the unit, and reduces maintenance costs. Attached Figure Description

[0013] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0014] Figure 1 This is a circuit connection diagram of this utility model.

[0015] Figure Labels

[0016] Compressor--101, Four-way solenoid valve--102, Air-side heat exchanger--103, Cold water heat exchanger--104, Hot water heat exchanger--105, Refrigeration electric expansion valve--106, Heating electric expansion valve--107, Defrosting solenoid valve--108, Oil separator--109, Gas-liquid separator--110, High and low pressure switch--111, First angle valve--112, Dryer filter--113, Second angle valve--114, Liquid receiver--115, Check valve--116. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] With increasingly stringent requirements for building energy conservation and environmental protection, the energy efficiency and multifunctionality of air conditioning systems have become a focus of industry attention. Traditional air conditioning systems typically employ a single cooling or heating mode, failing to simultaneously meet the cooling and heating needs of different areas, leading to energy waste and low operating efficiency. Furthermore, existing air-cooled screw chillers are prone to frosting in low-temperature environments, affecting heat exchange efficiency, and the oil and gas-liquid separation in the refrigerant cycle is ineffective, resulting in poor oil return to the compressor, impacting system stability and lifespan.

[0021] To address the aforementioned problems, this embodiment discloses an air-cooled screw compressor four-pipe integrated unit, including a compressor 101, a four-way solenoid valve 102, an air-side heat exchanger 103, a chilled water heat exchanger 104, a hot water heat exchanger 105, a refrigeration electric expansion valve 106, a heating electric expansion valve 107, and a defrost solenoid valve 108; the liquid outlet of the compressor 101 is connected to the first connecting end of the four-way solenoid valve 102, and the liquid inlet of the compressor 101 is connected to the third connecting end of the four-way solenoid valve 102 and the chilled water heat exchanger 104. The liquid outlet is connected to the second connection end of the four-way solenoid valve 102, which is connected to the liquid inlet end of the air-side heat exchanger 103, and the fourth connection end of the four-way solenoid valve 102, which is connected to the liquid inlet end of the hot water heat exchanger 105. The liquid outlet end of the air-side heat exchanger 103 is connected to one end of the heating electric expansion valve 107, and the other end of the heating electric expansion valve 107 is connected to one end of the defrost solenoid valve 108 and the liquid inlet end of the cold water heat exchanger 104, respectively. The other end of the defrost solenoid valve 108 is connected to the liquid outlet end of the hot water heat exchanger 105.

[0022] In this embodiment, four operating conditions can be switched at any time. Specifically, the following four operating conditions can be achieved: (1) when the four-way solenoid valve 102 is closed, the cooling electric expansion valve 106 is open, the heating electric expansion valve 107 is closed, and the defrosting solenoid valve 108 is closed, the cooling effect can be achieved; (2) when the four-way solenoid valve 102 is open, the cooling electric expansion valve 106 is open, the heating electric expansion valve 107 is closed, and the defrosting solenoid valve 108 is closed, the cooling + hot water effect can be achieved; (3) when the four-way solenoid valve 102 is open, the cooling electric expansion valve 106 is closed, the heating electric expansion valve 107 is open, and the defrosting solenoid valve 108 is closed, the hot water effect can be achieved; (4) when the four-way solenoid valve 102 is closed, the cooling electric expansion valve 106 is closed, the heating electric expansion valve 107 is closed, and the defrosting solenoid valve 108 is open, the defrosting effect can be achieved.

[0023] Under operating condition (1), air conditioning chilled water (7 / 12 degrees) is prepared; under operating condition (2), hot water (45 / 40 degrees) is prepared; under operating condition (3), hot water (45 / 40 degrees) can be prepared at the same time as air conditioning chilled water (7 / 12 degrees); under operating condition (4), when the fin surface is frosted in winter and the defrosting conditions are met, the defrosting mode is run.

[0024] Furthermore, the air-cooled screw four-pipe integrated unit also includes an oil separator 109 and a gas-liquid separator 110. The gas-liquid separator 110 is connected between the liquid inlet end of the compressor 101 and the third connection end of the four-way solenoid valve 102, and the oil separator 109 is connected between the liquid outlet end of the compressor 101 and the first connection end of the four-way solenoid valve 102.

[0025] Furthermore, a high-low pressure switch 111 is also connected between the liquid inlet end and the liquid outlet end of the compressor 101.

[0026] Furthermore, a first angle valve 112, a drying filter 113, a second angle valve 114, and a liquid storage tank 115 are sequentially connected between the heating electric expansion valve 107 and the liquid outlet of the hot water heat exchanger 105.

[0027] Furthermore, a one-way valve 116 is connected between the outlet end of the hot water heat exchanger 105 and the storage tank 115, between the second connection end of the four-way solenoid valve 102 and the inlet end of the compressor 101, and between the outlet end of the cold water heat exchanger 104 and the inlet end of the compressor 101.

[0028] In summary, this utility model discloses an integrated air-cooled screw compressor four-pipe unit. Through the coordinated operation of the four-way solenoid valve 102, the chilled water heat exchanger 104, the hot water heat exchanger 105, the refrigeration electric expansion valve 106, the heating electric expansion valve 107, and the defrost solenoid valve 108, it achieves rapid switching between multiple modes such as refrigeration, heating, and defrosting. It can simultaneously meet the heating and cooling needs of different areas, significantly improve energy utilization efficiency, and reduce energy waste. In addition, by adding the defrost solenoid valve 108, the problems of poor oil return from the compressor 101 and frosting in low-temperature environments are effectively solved, improving the system's stability and low-temperature adaptability, extending the unit's service life, and reducing maintenance costs.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A four-pipe integrated air-cooled screw compressor unit, characterized in that, This includes compressors, four-way solenoid valves, air-side heat exchangers, chilled water heat exchangers, hot water heat exchangers, refrigeration electric expansion valves, heating electric expansion valves, and defrosting solenoid valves. The compressor's outlet is connected to the first connection terminal of the four-way solenoid valve, the compressor's inlet is connected to the third connection terminal of the four-way solenoid valve and the outlet of the cold water heat exchanger, the second connection terminal of the four-way solenoid valve is connected to the inlet terminal of the air-side heat exchanger, and the fourth connection terminal of the four-way solenoid valve is connected to the inlet terminal of the hot water heat exchanger. The liquid outlet of the air-side heat exchanger is connected to one end of the heating electric expansion valve, the other end of the heating electric expansion valve is connected to one end of the defrost solenoid valve and the liquid inlet of the cold water heat exchanger, and the other end of the defrost solenoid valve is connected to the liquid outlet of the hot water heat exchanger.

2. The air-cooled screw compressor four-pipe integrated unit according to claim 1, characterized in that, The air-cooled screw compressor four-pipe integrated unit also includes an oil separator and a gas-liquid separator. The gas-liquid separator is connected between the liquid inlet end of the compressor and the third connection end of the four-way solenoid valve, and the oil separator is connected between the liquid outlet end of the compressor and the first connection end of the four-way solenoid valve.

3. The air-cooled screw compressor four-pipe integrated unit according to claim 1, characterized in that, A high-low pressure switch is also connected between the liquid inlet and liquid outlet of the compressor.

4. The air-cooled screw compressor four-pipe integrated unit according to claim 1, characterized in that, The heating electric expansion valve is connected in sequence to the liquid outlet of the hot water heat exchanger by a first angle valve, a drying filter, a second angle valve, and a liquid storage tank.

5. The air-cooled screw four-pipe integrated unit according to claim 4, characterized in that, One-way valves are connected between the outlet end of the hot water heat exchanger and the storage tank, between the second connection end of the four-way solenoid valve and the inlet end of the compressor, and between the outlet end of the cold water heat exchanger and the inlet end of the compressor.

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