High-efficiency stable closed air cooling system

Abstract

This utility model discloses a high-efficiency, stable, and closed-loop air-cooled system, relating to the field of cooling system technology. It includes a compressor, condenser, variable-speed fan, dryer filter, water tank, coil, hot gas bypass valve, and bypass branch. By setting the hot gas bypass valve and bypass branch, when the chilled water temperature reaches the set temperature and then drops to the set temperature point of the hot gas bypass valve, the hot gas bypass valve opens. This allows a portion of the high-temperature, high-pressure refrigerant compressed by the compressor to directly reach the coil through the hot gas bypass valve, neutralizing part of the machine's cooling capacity before returning to the compressor without passing through the condenser. The refrigeration system achieves a balance between load and cooling capacity through the hot gas bypass valve. This allows the compressor to operate continuously while maintaining chilled water temperature control accuracy within ±1℃, significantly improving temperature control accuracy compared to traditional refrigeration systems.

Description

Technical Field

[0001] This utility model relates to the field of cooling system technology, and in particular to a high-efficiency, stable, and sealed air-cooled cooling system. Background Technology

[0002] Air-cooled systems are widely used in industrial cooling, data centers, and precision instrument temperature control due to their simple structure and easy maintenance.

[0003] Currently, common air-cooled cooling systems on the market mainly consist of basic components such as compressors, condensers, expansion valves, and evaporators. For example, CN202648229U discloses an energy-saving air-cooled chiller unit, in which the compressor discharge port of the refrigeration unit is connected to the condenser, the condenser is connected to the liquid receiver, the liquid receiver is connected to the dryer filter, the dryer filter is connected to the sight glass, the sight glass is connected to the thermal expansion valve, the thermal expansion valve is connected to the evaporator, the evaporator is connected to the gas-liquid separator, and the gas-liquid separator is connected to the compressor suction port, forming a refrigeration system loop.

[0004] However, the compressors in existing refrigeration systems cannot work continuously. Under normal circumstances, the compressors need to work intermittently to control the temperature, which will lead to large temperature fluctuations in the system and cannot meet the requirements for high-precision temperature control. Utility Model Content

[0005] The purpose of this invention is to provide a highly efficient, stable, and sealed air-cooled cooling system to solve the aforementioned technical problems.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A high-efficiency, stable, closed-loop air-cooled cooling system includes a compressor, a condenser, a variable-speed fan, a dryer filter, a water tank, a coil, a hot gas bypass valve, and a bypass branch. The compressor is connected to the condenser via a first pipeline, the condenser is connected to the dryer filter via a second pipeline, the variable-speed fan is located on one side of the condenser, the dryer filter is connected to the coil via a third pipeline, the coil is located inside the water tank, the coil is connected to the compressor via a fourth pipeline, the bypass branch connects the first pipeline and the third pipeline, and the hot gas bypass valve is located on the bypass branch.

[0008] Preferably, a high-voltage switch is also included, and the high-voltage switch is provided on the second pipeline.

[0009] Preferably, the system also includes a liquid pipe solenoid valve, a sight glass, an expansion valve, and a low-pressure switch. The liquid pipe solenoid valve, the sight glass, the expansion valve, and the low-pressure switch are sequentially arranged on the third pipeline from the dryer filter to the water tank. The bypass branch is located between the expansion valve and the low-pressure switch.

[0010] Preferably, the water tank also includes a temperature sensor and a float valve. The temperature sensor is installed on the side wall of the water tank, and a water inlet is installed at the upper end of one side of the water tank. The float valve is installed at the water inlet.

[0011] Preferably, the water tank also includes a level gauge, which is installed on the outer wall of the other side of the water tank.

[0012] Preferably, the system also includes a pump, a drain pipe, and a fifth pipeline. The pump is located on one side of the water tank, with its inlet connected to the water tank and its outlet connected to the drain pipe. One end of the fifth pipeline is connected to the drain pipe, and the other end of the fifth pipeline is connected to the water tank.

[0013] As a further preferred embodiment, the system also includes a water pressure gauge, a bypass valve, and a flow switch. The water pressure gauge is installed on the drain pipe, the bypass valve is installed at one end of the fifth pipeline, and the flow switch is installed at the other end of the fifth pipeline.

[0014] Preferably, the condenser has an internal condenser tube made of aluminum alloy.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In this invention, by setting a hot gas bypass valve and a bypass branch, when the chilled water temperature reaches the set temperature and drops to the set temperature point of the hot gas bypass valve, the hot gas bypass valve opens, allowing part of the high-temperature, high-pressure refrigerant compressed by the compressor to directly reach the coil through the hot gas bypass valve. After neutralizing part of the machine's cooling capacity, it returns to the compressor without passing through the condenser. The refrigeration system achieves a balance between load and cooling capacity through the hot gas bypass valve, which allows the compressor to work continuously while ensuring the chilled water temperature control accuracy is within ±1℃, significantly improving the temperature control accuracy compared to traditional refrigeration systems. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the efficient, stable, and sealed air-cooled cooling system in this utility model.

[0018] In the diagram: 1. Compressor; 2. Condenser; 3. Variable speed fan; 4. Dryer filter; 5. Water tank; 6. Coil; 7. Hot gas bypass valve; 8. Bypass branch; 9. First pipeline; 10. Second pipeline; 11. Third pipeline; 12. Fourth pipeline; 13. High pressure switch; 14. Liquid line solenoid valve; 15. Sight glass; 16. Expansion valve; 17. Low pressure switch; 18. Temperature sensor; 19. Float valve; 20. Level gauge; 21. Pump; 22. Drain pipe; 23. Fifth pipeline; 24. Water pressure gauge; 25. Bypass valve; 26. Flow switch. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] 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," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] 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 mechanical connection or an electrical 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.

[0022] Figure 1 This is a schematic diagram of the efficient and stable closed-loop air-cooling system of this utility model. Please refer to [link / reference]. Figure 1The diagram illustrates a preferred embodiment of a highly efficient and stable closed-loop air-cooled system, comprising a compressor 1, a condenser 2, a variable-speed fan 3, a filter dryer 4, a water tank 5, a coil 6, a hot gas bypass valve 7, and a bypass branch 8. The compressor 1 is connected to the condenser 2 via a first pipe 9. The condenser 2 is connected to the filter dryer 4 via a second pipe 10. The variable-speed fan 3 is located on one side of the condenser 2. The filter dryer 4 is connected to the coil 6 via a third pipe 11. The coil 6 is located inside the water tank 5 and is connected to the compressor 1 via a fourth pipe 12. The bypass branch 8 connects the first pipe 9 and the third pipe 11, and a hot gas bypass valve 7 is installed on the bypass branch 8. See also... Figure 1 As shown, with the hot gas bypass valve 7 and bypass branch 8, when the temperature of the chilled water in the water tank 5 reaches the set temperature, the compressor 1 will continue to work. When the temperature drops to the set temperature point of the hot gas bypass valve 7, the hot gas bypass valve 7 opens, and part of the high-temperature and high-pressure refrigerant at the compressor port goes directly to the coil 6 through the bypass branch 8 without passing through the condenser 2. The refrigeration system achieves a balance between load and cooling capacity through the hot gas bypass valve 7. This allows the compressor 1 to work continuously while ensuring the chilled water temperature control accuracy is within ±1℃, which is significantly improved compared to the temperature control accuracy of traditional refrigeration systems.

[0023] Furthermore, as a preferred embodiment, a high-pressure switch 13 is also included, which is installed on the second pipeline 10. The high-pressure switch 13 is used to monitor the refrigerant pressure at the outlet of the condenser 2. When the pressure exceeds a preset value, the high-pressure switch 13 will trigger the system protection mechanism to cut off the power supply to the compressor 1, preventing the equipment from being damaged due to excessive system pressure.

[0024] Furthermore, as a preferred embodiment, it also includes a liquid line solenoid valve 14, a sight glass 15, an expansion valve 16, and a low-pressure switch 17. The liquid line solenoid valve 14, sight glass 15, expansion valve 16, and low-pressure switch 17 are sequentially arranged on the third pipeline 11 from the dryer filter 4 to the water tank 5. The bypass branch 8 connects to the third pipeline 11 between the expansion valve 16 and the low-pressure switch 17. The liquid line solenoid valve 14 controls the refrigerant flow and can cut off the refrigerant supply, effectively preventing the coil 6 from freezing after shutdown. The sight glass 15 is used to observe the refrigerant flow status and water content. The expansion valve 16 is used to reduce the refrigerant pressure and control its flow rate. The low-pressure switch 17 monitors the refrigerant pressure at the evaporator inlet. When the pressure is lower than a preset value, the low-pressure switch 17 triggers the system protection mechanism.

[0025] Furthermore, as a preferred embodiment, the system also includes a temperature sensor 18 and a float valve 19. The temperature sensor 18 is mounted on the side wall of the water tank 5, and a water inlet is located at the upper end of one side of the water tank 5, with the float valve 19 installed at the inlet. The temperature sensor 18 is used to monitor the water temperature inside the water tank 5 in real time, providing data support for system control. The float valve 19, installed at the water inlet, can automatically control the water intake based on the water level inside the water tank 5, maintaining a stable water level. The probe of the temperature sensor 18 extends into the water tank 5.

[0026] Furthermore, as a preferred embodiment, a level gauge 20 is also included, which is installed on the outer wall of the other side of the water tank 5. The level gauge 20 is used to visually display the water level status inside the water tank 5, facilitating operators to monitor the system operation.

[0027] Furthermore, as a preferred embodiment, the system also includes a pump 21, a drain pipe 22, and a fifth pipe 23. The pump 21 is located on one side of the water tank 5, with its inlet connected to the water tank 5 and its outlet connected to the drain pipe 22. One end of the fifth pipe 23 is connected to the drain pipe 22, and the other end is connected to the water tank 5. The pump 21 drives the cooling water in the water tank 5 to circulate, improving heat exchange efficiency. The drain pipe 22 transports the cooling water to the water-using equipment. The fifth pipe 23 serves as a return water channel, guiding the water returning from the water-using equipment back to the water tank 5, forming a closed-loop circulation system.

[0028] Furthermore, as a preferred embodiment, the system also includes a pressure gauge 24, a bypass valve 25, and a flow switch 26. A pressure gauge 24 is installed on the drain pipe 22, a bypass valve 25 is installed at one end of the fifth pipe 23, and a flow switch 26 is installed at the other end of the fifth pipe 23. The pressure gauge 24 is used to monitor the water pressure in the drain pipe 22 to ensure the system operates within a safe pressure range; the bypass valve 25 is used to regulate the return water flow to balance the system pressure; and the flow switch 26 is used to monitor the return water flow and trigger an alarm or protection mechanism when the flow is abnormal.

[0029] Furthermore, as a preferred embodiment, the condenser 2 has internal condenser tubes made of aluminum alloy. Aluminum alloy has good thermal conductivity and corrosion resistance, which can improve heat exchange efficiency and extend the service life of the equipment.

[0030] In this embodiment, an external PLC controller can also be provided to connect with various electrical components in the system and control the operation of the entire system.

[0031] In operation, compressor 1 compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure refrigerant, which is then transported to condenser 2 via the first pipeline 9. Under the action of variable-speed fan 3, condenser 2 cools the high-temperature, high-pressure refrigerant to a normal-temperature, high-pressure refrigerant, which is then transported to dryer filter 4 via the second pipeline 10. Dryer filter 4 removes moisture and impurities from the refrigerant, and the purified refrigerant passes through the third pipeline 11 in sequence through liquid line solenoid valve 14, sight glass 15, expansion valve 16, and low-pressure switch 17, before entering coil 6 in water tank 5. In coil 6, the refrigerant absorbs heat from the water in water tank 5, evaporates into a low-temperature, low-pressure refrigerant, and returns to compressor 1 via the fourth pipeline 12, completing one refrigeration cycle.

[0032] When the system needs to adjust the cooling capacity or prevent the water temperature in the water tank 5 from being too low, the hot gas bypass valve 7 is opened, and some high-temperature and high-pressure gas enters directly between the expansion valve 16 and the low-pressure switch 17 of the third pipeline 11 through the bypass branch 8. It mixes with the low-temperature and low-pressure refrigerant coming out of the expansion valve 16, adjusts the temperature of the refrigerant entering the coil 6, and thus controls the cooling degree of the water in the water tank 5.

[0033] Pump 21 draws cooling water from water tank 5 and delivers it to water-using equipment through drain pipe 22. Water used by the water-using equipment flows back to water tank 5 through fifth pipe 23, forming a closed-loop circulation. Water pressure gauge 24 monitors the water pressure in drain pipe 22, bypass valve 25 regulates the return water flow, and flow switch 26 monitors the return water status, all working together to ensure stable system operation.

[0034] Temperature sensor 18 monitors the water temperature in water tank 5 in real time, providing data support for system control; float valve 19 automatically controls water replenishment according to the water level in water tank 5; level gauge 20 intuitively displays the water level status in water tank 5, facilitating monitoring by operators.

[0035] High-voltage switch 13 and low-voltage switch 17 monitor the pressure on the high-voltage side and low-voltage side of the system, respectively. When the pressure is abnormal, the protection mechanism is triggered to ensure the safe operation of the system.

[0036] This embodiment's high-efficiency, stable, closed-loop air-cooled system achieves efficient heat exchange and stable cooling through a rational structural design and component configuration. The system employs a closed-loop design, reducing water waste and environmental pollution. The variable-speed fan 3 can adjust its speed according to cooling requirements, optimizing energy utilization efficiency. The hot gas bypass system can precisely regulate the cooling temperature, preventing the risk of freezing due to excessively low water temperature. Multiple monitoring and protection devices ensure safe and stable system operation, extending equipment lifespan.

[0037] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency, stable, closed-loop air-cooling system, characterized in that, The system includes a compressor, a condenser, a variable-speed fan, a dryer filter, a water tank, a coil, a hot gas bypass valve, and a bypass branch. The compressor is connected to the condenser via a first pipeline, and the condenser is connected to the dryer filter via a second pipeline. The variable-speed fan is located on one side of the condenser. The dryer filter is connected to the coil via a third pipeline. The coil is located inside the water tank and is connected to the compressor via a fourth pipeline. The bypass branch connects the first pipeline and the third pipeline, and the hot gas bypass valve is located on the bypass branch.

2. The high-efficiency, stable, closed-loop air-cooling system as described in claim 1, characterized in that, It also includes a high-voltage switch, which is installed on the second pipeline.

3. The high-efficiency, stable, closed-loop air-cooling system as described in claim 1, characterized in that, It also includes a liquid pipe solenoid valve, a sight glass, an expansion valve, and a low-pressure switch. The liquid pipe solenoid valve, the sight glass, the expansion valve, and the low-pressure switch are sequentially arranged on the third pipeline from the dryer filter to the water tank. The bypass branch is located between the expansion valve and the low-pressure switch.

4. The high-efficiency, stable, closed-loop air-cooling system as described in claim 1, characterized in that, It also includes a temperature sensor and a float valve. The temperature sensor is installed on the side wall of the water tank, and a water inlet is installed at the upper end of one side of the water tank. The float valve is installed at the water inlet.

5. The high-efficiency, stable, closed-loop air-cooled cooling system as described in claim 1, characterized in that, It also includes a level gauge, which is installed on the outer wall of the other side of the water tank.

6. The high-efficiency, stable, closed-loop air-cooling system as described in claim 1, characterized in that, It also includes a pump, a drain pipe, and a fifth pipeline. The pump is located on one side of the water tank. The inlet of the pump is connected to the water tank, and the outlet of the pump is connected to the drain pipe. One end of the fifth pipeline is connected to the drain pipe, and the other end of the fifth pipeline is connected to the water tank.

7. The high-efficiency, stable, closed-loop air-cooling system as described in claim 6, characterized in that, It also includes a water pressure gauge, a bypass valve, and a flow switch. The water pressure gauge is installed on the drain pipe, the bypass valve is installed at one end of the fifth pipeline, and the flow switch is installed at the other end of the fifth pipeline.

8. The high-efficiency, stable, closed-loop air-cooling system as described in claim 1, characterized in that, The condenser has a condenser tube inside, which is made of aluminum alloy.

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