Water-cooled air-borne water chiller

Abstract

The utility model discloses a water -cooling air suspension cold water unit relates to refrigeration equipment technical field, and the top of water -cooling condenser and full -liquid type evaporator is set up condenser hot gas bypass mouth and evaporator hot gas bypass mouth respectively, and condenser hot gas bypass mouth and evaporator hot gas bypass mouth are respectively communicated and set up condenser stop valve and evaporator stop valve, and condenser stop valve and evaporator stop valve are communicated and set up hot gas bypass valve through hot gas bypass pipeline between, the utility model discloses water -cooling condenser and full -liquid type evaporator's top is set up condenser hot gas bypass mouth and evaporator hot gas bypass mouth respectively, and condenser hot gas bypass mouth and evaporator hot gas bypass mouth are respectively communicated and set up condenser stop valve and evaporator stop valve, and condenser stop valve and evaporator stop valve are communicated and set up hot gas bypass valve through hot gas bypass pipeline between, can effectively prevent compressor low -frequency operation and take place the compressor damage caused by surge, is favorable to the guarantee of compressor service life.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, specifically to a water-cooled air-suspended chiller unit for refrigeration. Background Technology

[0002] Water-cooled air-suspension chillers are refrigeration equipment with advantages of large cooling capacity and low energy consumption. The flooded evaporator is a key component of the water-cooled air-suspension chiller. Its main operating mode involves chilled water circulating in its tube side, while the refrigerant is located outside the tubes (in the shell side), entering from the bottom and exiting from the top. Inside the evaporator, the refrigerant is in liquid form, submerging most of the heat exchange tubes. The refrigerant and water exchange heat through the heat exchange tubes, evaporating into saturated refrigerant vapor, which exits from the top of the evaporator and is drawn into the compressor's suction line, forming a refrigerant circulation within the evaporator. This structural design of the evaporator significantly reduces the temperature difference between water and refrigerant, thus improving the energy efficiency ratio of the water-cooled air-suspension chiller.

[0003] However, existing water-cooled air-suspension chiller units still have some problems during use: First, under certain operating conditions, the user load is relatively small, requiring a corresponding reduction in compressor speed to decrease the cooling capacity output of the water-cooled air-suspension chiller unit. However, the centrifugal compressor's speed decreases during low-frequency operation, which can easily cause surge and damage to the compressor. Second, after the compressor stops running, the compressor may reverse due to pressure relief from the compressor outlet to the compressor inlet, causing compressor damage. Third, some compressors, such as air-suspension centrifugal compressors, experience significant motor heating during operation, which can easily lead to motor overheating and compressor damage. In addition, in existing water-cooled air-suspension chiller units, the evaporator and condenser are installed side by side, with the economizer installed below the condenser or in the gap between the evaporator and condenser. This structure results in a small internal space, which is not conducive to maintenance work, and the sight glass on the liquid line is located on the refrigeration piping between the evaporator and condenser, making observation extremely inconvenient. Utility Model Content

[0004] This invention aims to overcome the shortcomings of the existing technology by providing a water-cooled air-suspended chiller unit.

[0005] This utility model adopts the following technical solution to solve the technical problem: a water-cooled air-suspended chiller unit, including a unit electrical control system, refrigeration components, and auxiliary system piping components; the refrigeration components include a compressor, a water-cooled condenser, and a flooded evaporator; the compressor outlet of the compressor is connected to the condenser inlet of the water-cooled condenser, the condenser outlet of the water-cooled condenser is connected to the evaporator inlet of the flooded evaporator, and the evaporator outlet of the flooded evaporator is connected to the compressor inlet of the compressor; the unit electrical control system is used to control the variable frequency operation of the compressor and the operation of the auxiliary system piping components; a condenser hot gas bypass port and an evaporator hot gas bypass port are respectively opened on the top of the water-cooled condenser and the flooded evaporator; a condenser shut-off valve and an evaporator shut-off valve are respectively connected to the condenser hot gas bypass port and the evaporator hot gas bypass port; a hot gas bypass valve is connected between the condenser shut-off valve and the evaporator shut-off valve through a hot gas bypass pipeline.

[0006] Furthermore, the auxiliary system piping components include a compressor check valve, a shutdown bypass pipeline, and a shutdown bypass valve; The compressor outlet is connected to the compressor check valve. The front end of the shutdown bypass pipeline is connected to the compressor inlet, and the rear end is connected between the compressor outlet and the compressor check valve. The shutdown bypass pipeline is connected to the shutdown bypass valve.

[0007] Furthermore, the flooded evaporator has an air inlet in the middle of the evaporator; the auxiliary system piping components also include a motor cooling liquid inlet pipe, a motor cooling liquid pipe ball valve, a motor cooling liquid pipe dryer, and a motor cooling expansion valve; The front end of the motor cooling inlet pipe is connected to the liquid outlet of the condenser, and the rear end is connected to the motor cooling inlet of the compressor; the motor cooling inlet pipe is sequentially connected to the motor cooling pipe ball valve, the motor cooling pipe dryer, and the motor cooling expansion valve; the compressor motor cooling return port is connected to the middle air inlet of the evaporator through the motor cooling return pipe.

[0008] Furthermore, the refrigeration component also includes an economizer, and the auxiliary system piping components also include an economizer refrigeration expansion valve, a condenser liquid outlet shut-off valve, an economizer high-pressure liquid outlet shut-off valve, a main expansion valve, and an economizer return gas pipeline shut-off valve. The condenser outlet shut-off valve is connected between the condenser outlet and the front end of the motor cooling inlet pipe, and the economizer high-pressure inlet of the economizer is connected in parallel to the front end of the motor cooling inlet pipe to the downstream of the condenser outlet shut-off valve. The high-pressure outlet of the economizer is connected in sequence to the high-pressure outlet shut-off valve of the economizer and the main expansion valve, and then connected to the inlet of the evaporator. The low-pressure liquid inlet of the economizer is connected to the refrigerant outlet of the economizer's refrigeration expansion valve. The low-pressure outlet of the economizer is connected to the shut-off valve of the economizer return gas pipeline and then to the compressor's compressor air supply port. The refrigerant inlet of the economizer expansion valve is connected between the high-pressure outlet of the economizer and the shut-off valve of the high-pressure outlet of the economizer.

[0009] Furthermore, the flooded evaporator is also equipped with an evaporator drain valve, an evaporator vent valve, and an evaporator safety valve, which are connected as auxiliary system piping components; the evaporator outlet is also connected with an evaporator outlet pipe shut-off valve, which is also an auxiliary system piping component. The water-cooled condenser is also equipped with a condenser drain valve, a condenser vent valve, and a condenser safety valve, which are connected as auxiliary system piping components.

[0010] Furthermore, the auxiliary system piping components also include a drying filter tank, a sight glass, a condenser sight glass, and an evaporator sight glass; The high-pressure inlet of the economizer and the shut-off valve of the condenser outlet are connected in sequence to the drying filter and the liquid sight glass. A sight glass is provided on the front side of the water-cooled condenser, and a sight glass is provided on the rear side of the evaporator.

[0011] Furthermore, the flooded evaporator is located below the compressor, the water-cooled condenser is located below the front side of the compressor, and the economizer is located in front of the water-cooled condenser; The evaporator shut-off valve is located above the right end of the flooded evaporator, and the condenser shut-off valve is located above the right end of the water-cooled condenser.

[0012] Furthermore, the unit's electrical control system also includes a condenser level gauge, a lower level maintenance valve, and an upper level maintenance valve; The water-cooled condenser is equipped with a condenser level gauge for monitoring its internal liquid level. The upper and lower interfaces of the condenser level gauge are respectively connected to the upper liquid level inspection valve and the lower liquid level inspection valve.

[0013] Furthermore, the hot gas bypass valve, the main expansion valve, the shutdown bypass valve, and the economizer refrigeration expansion valve are electronic valves.

[0014] Furthermore, the compressor is a semi-hermetic air-suspension oil-free centrifugal compressor, the flooded evaporator is a horizontal shell-and-tube evaporator with flooded internal threaded heat exchange tubes inside, and the water-cooled condenser is a horizontal shell-and-tube condenser with flooded external threaded heat exchange tubes inside. The economizer is a stainless steel plate heat exchanger. Both the evaporator shut-off valve and the condenser shut-off valve are special steel angle valves for Freon. The compressor check valve is a Freon-specific wafer check valve.

[0015] This utility model provides a water-cooled air-suspended chiller unit, which has the following beneficial effects: 1. The top of the water-cooled condenser and the flooded evaporator of this utility model are respectively provided with a condenser hot gas bypass port and an evaporator hot gas bypass port. The condenser hot gas bypass port and the evaporator hot gas bypass port are respectively connected to a condenser shut-off valve and an evaporator shut-off valve. The condenser shut-off valve and the evaporator shut-off valve are connected by a hot gas bypass pipeline and a hot gas bypass valve, which can effectively prevent compressor damage caused by surge during low-frequency operation of the compressor and help ensure the service life of the compressor.

[0016] 2. The compressor outlet of this utility model is connected to a compressor check valve. The front end of the shutdown bypass pipeline is connected to the compressor inlet, and the rear end is connected to the compressor outlet and the compressor check valve. The shutdown bypass pipeline is connected to a shutdown bypass valve, which can ensure the internal pressure balance after the compressor stops, prevent the compressor from being damaged due to reverse rotation after the compressor stops, and further protect the service life of the compressor.

[0017] 3. The front end of the motor cooling inlet pipe of this utility model is connected to the liquid outlet of the condenser, and the rear end is connected to the motor cooling inlet of the compressor. The motor cooling inlet pipe is sequentially connected to a motor cooling pipe ball valve, a motor cooling pipe dryer, and a motor cooling expansion valve, so that part of the liquid refrigerant flows sequentially through the liquid outlet of the condenser, the motor cooling inlet pipe, and the motor cooling inlet into the motor cooling system of the compressor, cooling the compressor motor, preventing the motor from overheating during compressor operation, and further ensuring the service life of the compressor.

[0018] 4. The economizer of this utility model is located in front of the water-cooled condenser. The economizer and the auxiliary system piping components connected to it are all located on the outside of the water-cooled air-suspended chiller unit, which has a large and unobstructed operating space, which is conducive to maintenance work.

[0019] 5. This utility model adopts a shell-less structure, with a compact layout, convenient installation and operation, and is particularly suitable for high-temperature working conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a schematic diagram of the left-side structure of this utility model; Figure 5 This is a schematic diagram of the right-side structure of this utility model; Figure 6 This is a bottom view of the structure of this utility model.

[0021] In the picture: 1. Compressor; 2. Water-cooled condenser; 3. Condenser outlet shut-off valve; 4. Dryer filter; 5. Sight glass; 6. Economizer; 7. Economizer high-pressure outlet shut-off valve; 8. Main expansion valve; 9. Flooded evaporator; 10. Compressor check valve; 11. Evaporator outlet shut-off valve; 12. Evaporator shut-off valve; 13. Hot gas bypass valve; 14. Condenser shut-off valve; 15. Shutdown bypass valve; 16. Economizer refrigeration expansion valve; 17. Motor coolant pipe ball valve; 18. Motor coolant pipe dryer; 19. Electric... 20. Condenser level gauge, 21. Lower level inspection valve, 22. Upper level inspection valve, 23. Condenser drain valve, 24. Evaporator drain valve, 25. Condenser sight glass, 26. Evaporator sight glass, 27. Condenser vent valve, 28. Condenser safety valve, 29. Evaporator vent valve, 30. Evaporator safety valve, 31. Economizer return gas line shut-off valve, 32. Motor cooling liquid inlet, 33. Motor cooling gas return port, 34. Evaporator middle gas inlet, 35. Compressor gas supply port. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] A water-cooled air-suspended chiller unit, such as Figures 1-6As shown, its structural relationship is as follows: it includes the unit's electrical control system, refrigeration components, and auxiliary system piping components; the refrigeration components include compressor 1, water-cooled condenser, and flooded evaporator 9; the compressor outlet of compressor 1 is connected to the condenser inlet of water-cooled condenser 2, the condenser outlet of water-cooled condenser 2 is connected to the evaporator inlet of flooded evaporator 9, and the evaporator outlet of flooded evaporator 9 is connected to the compressor inlet of compressor 1; the unit's electrical control system is used to control the variable frequency operation of compressor 1 and the operation of auxiliary system piping components; the top of water-cooled condenser 2 and flooded evaporator 9 are respectively provided with condenser hot gas bypass port and evaporator hot gas bypass port, and condenser shut-off valve 14 and evaporator shut-off valve 12 are respectively connected to condenser shut-off valve 14 and evaporator shut-off valve 12, and a hot gas bypass valve 13 is provided between condenser shut-off valve 14 and evaporator shut-off valve 12 through a hot gas bypass pipeline.

[0024] In actual operation, the load on the user end is relatively small under certain operating conditions, and it is necessary to reduce the speed of compressor 1 accordingly to reduce the load on compressor 1; however, compressor 1 is prone to surge when rotating at low speed. At this time, opening the hot gas bypass valve 13 can increase the speed of compressor 1 without increasing the load on compressor 1 and eliminate the surge of compressor 1.

[0025] Preferably, the auxiliary system piping components include a compressor check valve 10, a shutdown bypass line, and a shutdown bypass valve 15; The compressor outlet is connected to a compressor check valve 10. The front end of the shutdown bypass pipeline is connected to the compressor inlet, and the rear end is connected to the compressor outlet and the compressor check valve 10. A shutdown bypass valve 15 is connected to the shutdown bypass pipeline.

[0026] When compressor 1 stops, the shutdown bypass valve 15 opens immediately, connecting the compressor outlet and compressor inlet of compressor 1 to balance the internal pressure of compressor 1 and prevent compressor 1 from reversing after stopping.

[0027] Preferably, the flooded evaporator 9 has an air inlet 34 in the middle of the evaporator; the auxiliary system piping components also include a motor cooling liquid inlet pipe, a motor cooling liquid pipe ball valve 17, a motor cooling liquid pipe dryer 18, and a motor cooling expansion valve 19. The front end of the motor cooling inlet pipe is connected to the condenser outlet, and the rear end is connected to the motor cooling inlet 32 ​​of the compressor 1. The motor cooling inlet pipe is sequentially connected to a motor cooling pipe ball valve 17, a motor cooling pipe dryer 18, and a motor cooling expansion valve 19. This allows some liquid refrigerant to flow sequentially through the condenser outlet, the motor cooling inlet pipe, and the motor cooling inlet 32 ​​into the motor cooling system of the compressor 1 to cool the motor of the compressor 1 and prevent the motor of the compressor 1 from overheating during operation. The motor cooling return port 33 of compressor 1 is connected to the central air inlet 34 of the evaporator via the motor cooling return pipe. The liquid refrigerant cools the motor of compressor 1 and evaporates into gaseous refrigerant, which then enters the flooded evaporator 9 through the motor cooling return port 33, the motor cooling return pipe, and the central air inlet 34 of the evaporator.

[0028] Preferably, the refrigeration components also include an economizer 6, and the auxiliary system piping components also include an economizer refrigeration expansion valve 16, a condenser liquid outlet shut-off valve 3, an economizer high-pressure liquid outlet shut-off valve 7, a main expansion valve 8, and an economizer return gas pipeline shut-off valve 31. The condenser outlet shut-off valve 3 is connected between the condenser outlet and the front end of the motor cooling inlet pipe. The economizer high-pressure inlet of the economizer 6 is connected in parallel to the front end of the motor cooling inlet pipe to the downstream of the condenser outlet shut-off valve 3. The high-pressure outlet of the economizer 6 is connected in sequence to the high-pressure outlet shut-off valve 7 and the main expansion valve 8, and then connected to the inlet of the evaporator. The low-pressure liquid inlet of the economizer 6 is connected to the refrigerant outlet of the economizer expansion valve 16. The low-pressure liquid outlet of the economizer 6 is connected to the shut-off valve 31 of the economizer return gas pipeline and then connected to the compressor replenishment port 35 of the compressor 1. The refrigerant inlet of the economizer expansion valve 16 is connected between the high-pressure liquid outlet of the economizer and the high-pressure liquid outlet shut-off valve 7 of the economizer.

[0029] Preferably, the flooded evaporator 9 is also equipped with an evaporator drain valve 24, an evaporator vent valve 29 and an evaporator safety valve 30, which are connected as auxiliary system piping components; the evaporator outlet is also connected with an evaporator outlet pipe shut-off valve 11, which is an auxiliary system piping component. The evaporator outlet valve 11 is preferably a Freon-specific wafer butterfly valve; The water-cooled condenser 2 is also equipped with a condenser drain valve 23, a condenser vent valve 27 and a condenser safety valve 28, which are connected as auxiliary system piping components.

[0030] Preferably, the auxiliary system piping components also include a dryer filter tank 4, a sight glass 5, a condenser sight glass 25, and an evaporator sight glass 26; A drying filter barrel 4 and a sight glass 5 are connected in sequence between the high-pressure liquid inlet of the economizer and the liquid outlet shut-off valve 3 of the condenser. A condenser sight glass 25 is installed on the front side of the water-cooled condenser 2, and an evaporator sight glass 26 is installed on the rear side of the evaporator.

[0031] Preferably, the flooded evaporator 9 is located below the compressor 1, the water-cooled condenser 2 is located below the front side of the compressor 1, and the economizer 6 is located in front of the water-cooled condenser 2. Evaporator shut-off valve 12 is located above the right end of flooded evaporator 9, and condenser shut-off valve 14 is located above the right end of water-cooled condenser 2.

[0032] Preferably, the unit's electrical control system also includes a condenser level gauge 20, a lower level inspection valve 21, and an upper level inspection valve 22; The water-cooled condenser 2 is equipped with a condenser level gauge 20 for monitoring its internal liquid level. The upper and lower interfaces of the condenser level gauge 20 are respectively connected to an upper liquid level inspection valve 22 and a lower liquid level inspection valve 21.

[0033] Preferably, the hot gas bypass valve 13, the main expansion valve 8, the shutdown bypass valve 15, and the economizer refrigeration expansion valve 16 are electronic valves.

[0034] Preferably, compressor 1 is a semi-hermetic air-suspension oil-free centrifugal compressor, which operates without oil, has high efficiency, runs smoothly, has low vibration and low noise; The flooded evaporator 9 is a horizontal shell and tube evaporator with flooded internal thread heat exchange tubes inside, which effectively reduces the design size of the flooded evaporator 9 and saves installation space. The water-cooled condenser 2 is a horizontal shell and tube condenser with a liquid-filled external threaded heat exchange tube inside to maximize the heat exchange area and heat exchange efficiency. The economizer 6 is a stainless steel plate heat exchanger. Both the evaporator shut-off valve 12 and the condenser shut-off valve 14 are special steel angle valves for Freon. The compressor check valve 10 is a wafer-type check valve specifically designed for Freon.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A water-cooled air-suspended chiller unit, comprising a unit electrical control system, refrigeration components, and auxiliary system piping components; the refrigeration components include a compressor (1), a water-cooled condenser, and a flooded evaporator (9); the compressor outlet of the compressor (1) is connected to the condenser inlet of the water-cooled condenser (2), the condenser outlet of the water-cooled condenser (2) is connected to the evaporator inlet of the flooded evaporator (9), and the evaporator outlet of the flooded evaporator (9) is connected to the compressor inlet of the compressor (1); the unit electrical control system is used to control the variable frequency operation of the compressor (1) and the operation of the auxiliary system piping components, characterized in that: The top of the water-cooled condenser (2) and the flooded evaporator (9) are respectively provided with a condenser hot gas bypass port and an evaporator hot gas bypass port. The condenser hot gas bypass port and the evaporator hot gas bypass port are respectively connected to a condenser shut-off valve (14) and an evaporator shut-off valve (12). The condenser shut-off valve (14) and the evaporator shut-off valve (12) are connected by a hot gas bypass pipe and a hot gas bypass valve (13).

2. The water-cooled air-suspended chiller unit according to claim 1, characterized in that: The auxiliary system piping components include a compressor check valve (10), a shutdown bypass pipeline, and a shutdown bypass valve (15). The compressor outlet is connected to the compressor check valve (10), the front end of the shutdown bypass pipeline is connected to the compressor inlet, and the rear end is connected between the compressor outlet and the compressor check valve (10). The shutdown bypass pipeline is connected to the shutdown bypass valve (15).

3. A water-cooled air-suspended chiller unit according to claim 2, characterized in that: The flooded evaporator (9) has an air inlet (34) in the middle of the evaporator; the auxiliary system piping components also include a motor cooling liquid inlet pipe, a motor cooling liquid pipe ball valve (17), a motor cooling liquid pipe dryer (18), and a motor cooling expansion valve (19). The front end of the motor cooling inlet pipe is connected to the liquid outlet of the condenser, and the rear end is connected to the motor cooling inlet (32) of the compressor (1); the motor cooling inlet pipe is sequentially connected to the motor cooling pipe ball valve (17), the motor cooling pipe dryer (18) and the motor cooling expansion valve (19); the motor cooling return port (33) of the compressor (1) is connected to the middle air inlet (34) of the evaporator through the motor cooling return port.

4. A water-cooled air-suspended chiller unit according to claim 3, characterized in that: The refrigeration components also include an economizer (6), and the auxiliary system piping components also include an economizer refrigeration expansion valve (16), a condenser liquid outlet shut-off valve (3), an economizer high-pressure liquid outlet shut-off valve (7), a main expansion valve (8), and an economizer return gas pipeline shut-off valve (31). The condenser outlet shut-off valve (3) is connected between the condenser outlet and the front end of the motor cooling inlet pipe. The economizer high pressure inlet of the economizer (6) is connected in parallel to the front end of the motor cooling inlet pipe to the downstream of the condenser outlet shut-off valve (3). The high-pressure outlet of the economizer (6) is connected in sequence to the high-pressure outlet shut-off valve (7) of the economizer and the main expansion valve (8), and then connected to the inlet of the evaporator. The low-pressure liquid inlet of the economizer (6) is connected to the refrigerant outlet of the economizer expansion valve (16). The low-pressure outlet of the economizer (6) is connected to the economizer return gas pipeline shut-off valve (31) and then connected to the compressor replenishment port (35) of the compressor (1). The refrigerant inlet of the economizer expansion valve (16) is connected between the high-pressure outlet of the economizer and the high-pressure outlet shut-off valve (7) of the economizer.

5. A water-cooled air-suspended chiller unit according to claim 1, characterized in that: The flooded evaporator (9) is also equipped with an evaporator drain valve (24), an evaporator vent valve (29), and an evaporator safety valve (30), which are connected as auxiliary system piping components; the evaporator outlet is also connected with an evaporator outlet pipe shut-off valve (11), which is also an auxiliary system piping component. The water-cooled condenser (2) is also equipped with a condenser drain valve (23), a condenser vent valve (27) and a condenser safety valve (28) which are connected as auxiliary system piping components.

6. A water-cooled air-suspended chiller unit according to claim 4, characterized in that: The auxiliary system piping components also include a dryer filter tank (4), a sight glass (5), a condenser sight glass (25), and an evaporator sight glass (26). The high-pressure inlet of the economizer and the shut-off valve (3) of the condenser outlet are connected in sequence to the drying filter (4) and the liquid mirror (5). The water-cooled condenser (2) is provided with a condenser sight glass (25) on the front side, and the evaporator is provided with an evaporator sight glass (26) on the rear side.

7. A water-cooled air-suspended chiller unit according to claim 4, characterized in that: The flooded evaporator (9) is located below the compressor (1), the water-cooled condenser (2) is located below the front side of the compressor (1), and the economizer (6) is located in front of the water-cooled condenser (2). The evaporator shut-off valve (12) is located above the right end of the flooded evaporator (9), and the condenser shut-off valve (14) is located above the right end of the water-cooled condenser (2).

8. A water-cooled air-suspended chiller unit according to claim 1, characterized in that: The unit's electrical control system also includes a condenser level gauge (20), a lower level maintenance valve (21), and an upper level maintenance valve (22). The water-cooled condenser (2) is equipped with a condenser level gauge (20) for monitoring its internal liquid level. The upper and lower interfaces of the condenser level gauge (20) are respectively connected to the upper liquid level inspection valve (22) and the lower liquid level inspection valve (21).

9. A water-cooled air-suspended chiller unit according to claim 4, characterized in that: The hot gas bypass valve (13), the main expansion valve (8), the shutdown bypass valve (15), and the economizer refrigeration expansion valve (16) are electronic valves.

10. A water-cooled air-suspended chiller unit according to claim 4, characterized in that: The compressor (1) is a semi-hermetic air-suspension oil-free centrifugal compressor, the flooded evaporator (9) is a horizontal shell and tube evaporator with a flooded internal thread heat exchange tube inside, and the water-cooled condenser (2) is a horizontal shell and tube condenser with a flooded external thread heat exchange tube inside. The economizer (6) is a stainless steel plate heat exchanger. The evaporator shut-off valve (12) and the condenser shut-off valve (14) are both special steel angle valves for Freon. The compressor check valve (10) is a Freon-specific wafer check valve.

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