Single-machine system air suspension frequency conversion centrifugal water chilling unit

Abstract

The utility model provides a stand-alone system air suspension frequency conversion centrifugal water chilling unit which comprises a circulation main loop formed by connecting an evaporator, an air suspension centrifugal compressor, a condenser and an economizer through refrigerant pipelines so as to form a refrigeration circulation loop; wherein throttling pipelines are respectively arranged on a refrigerant pipeline between the condenser and the economizer and a refrigerant pipeline between the economizer and the evaporator, so that secondary throttling is carried out on a liquid refrigerant in the refrigerant pipelines; one end of the air supply pipeline is communicated with the economizer, and the other end of the air supply pipeline is communicated with the air suspension centrifugal compressor; the variable-frequency cooling pipeline comprises a frequency converter, one end of the frequency converter is communicated with the condenser through a frequency converter cooling liquid inlet pipeline, and the other end of the frequency converter is communicated with the evaporator through a frequency converter cooling air return pipeline. The unit provided by the utility model can effectively improve the refrigeration efficiency and performance, and reduce the energy consumption and operation cost, thereby realizing the efficient, energy-saving and environment-friendly refrigeration effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration, and in particular relates to a single-system air-suspended variable-frequency centrifugal chiller. Background Art

[0002] Centrifugal chillers are widely used in building air conditioning systems. The compressor is the core component of the chiller, and improving compressor performance is the key to improving chiller performance. Currently, the compressors used in chillers are mainly traditional centrifugal compressors and magnetic levitation compressors, but each has corresponding defects, as follows:

[0003] Traditional centrifugal compressors use gear speed increase to appropriately increase the speed of the impeller, but lubricating oil is required between the gears and the shaft, which increases losses.

[0004] The magnetic levitation compressor uses a high-speed motor directly driven by a magnetic levitation bearing. The magnetic levitation bearing uses magnetic force, and there is no contact between the stator and the rotor. The use of non-contact magnetic levitation bearings can effectively improve lubrication loss and improve efficiency. It has the advantages of high speed, low vibration, low mechanical wear, no need for lubricating oil, and low noise. However, the magnetic levitation bearing requires active control, and the cost of the control system is relatively high.

[0005] At the same time, the existing chiller piping structure is relatively complex, the piping installation method is cumbersome, and the overall unit occupies a large area. Utility Model Content

[0006] In view of this, the present invention aims to provide a single-unit air-suspension variable-frequency centrifugal chiller to solve at least one of the above problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0008] The utility model provides a single-unit air suspension variable frequency centrifugal chiller, comprising:

[0009] The main circulation loop is composed of an evaporator, an air suspension centrifugal compressor, a condenser, and an economizer connected by refrigerant pipelines to form a refrigeration circulation loop; wherein the refrigerant pipeline between the condenser and the economizer, and the refrigerant pipeline between the economizer and the evaporator are each provided with a throttling pipeline to perform secondary throttling on the liquid refrigerant in the refrigerant pipeline;

[0010] an air supply pipeline, one end of which is connected to the economizer, and the other end of which is connected to the air suspension centrifugal compressor;

[0011] A variable frequency cooling pipeline includes a frequency converter, one end of the frequency converter is connected to the condenser through a frequency converter cooling liquid inlet pipeline, and the other end is connected to the evaporator through a frequency converter cooling air return pipeline.

[0012] Furthermore, the main circulation loop includes:

[0013] a first circulation branch, one end of which is connected to the evaporator, and the other end of which is connected to the air suspension centrifugal compressor, wherein a first butterfly valve, a needle valve and a first electric valve are provided on the first circulation branch;

[0014] a second circulation branch, one end of the second circulation branch being connected to the air suspension centrifugal compressor and the other end being connected to the condenser, and the second circulation branch being provided with a check valve and a second butterfly valve;

[0015] a third circulation branch, one end of the third circulation branch being connected to the condenser and the other end being connected to the economizer, the third circulation branch being provided with a primary throttling pipeline, a second ball valve, and a first temperature-sensing clamp, wherein the primary throttling pipeline is composed of a pipeline formed by connecting the first ball valve, the first filter drier, and the first electronic expansion valve;

[0016] A fourth circulation branch, one end of which is connected to the economizer, and the other end of which is connected to the evaporator, is provided with a secondary throttling pipeline and a fourth ball valve, wherein the secondary throttling pipeline is composed of a pipeline formed by connecting the third ball valve, the second temperature sensing clip and the second electronic expansion valve.

[0017] Furthermore, a connecting plate for fixing the economizer is provided on the outer wall of the condenser;

[0018] A bracket for fixing the first drying filter is also provided on the outer wall of the condenser.

[0019] Furthermore, a second electric valve is provided on the air supply pipeline.

[0020] Furthermore, the inverter cooling liquid inlet pipeline is provided with a first stop valve, a second drying filter, a first solenoid valve, a third electronic expansion valve, a first sight glass and a second stop valve;

[0021] The inverter cooling return air pipeline is provided with a third stop valve and a fourth stop valve.

[0022] Furthermore, it also includes:

[0023] a motor cooling liquid inlet pipeline, the motor cooling liquid inlet pipeline being arranged between the condenser and the compressor, and being provided with a fifth stop valve, a third drying filter, a second solenoid valve, a fourth electronic expansion valve, and a second sight glass;

[0024] The motor cooling air return pipeline is arranged between the compressor and the evaporator, and a sixth shut-off valve is provided on the motor cooling air return pipeline.

[0025] Furthermore, a mounting bracket is provided on the top of the evaporator, and the air suspension centrifugal compressor is fixed on the mounting bracket by fastening bolts.

[0026] The mounting bracket is further provided with a first pipe bracket and a second pipe bracket, and the motor cooling liquid inlet pipe and the motor cooling air return pipe are fixed to the first pipe bracket through pipe clamps;

[0027] The pressure protection pipeline is fixed to the second pipeline support through a pipe clamp.

[0028] Furthermore, it also includes:

[0029] A pressure protection pipeline, one end of which is connected to the first circulation branch, and the other end of which is connected to the second circulation branch, and a third solenoid valve is provided on the pressure protection pipeline.

[0030] Furthermore, it also includes:

[0031] A hot gas bypass pipeline is provided between the evaporator and the condenser, and a third electric valve is provided on the hot gas bypass pipeline.

[0032] Furthermore, it also includes a bottom frame, on which two layers of fixing brackets are stacked, the condenser and the evaporator are both connected to the fixing brackets through flanges, and the evaporator is located above the condenser;

[0033] A first support frame is further provided on the outer wall of the condenser, and a control cabinet is installed on the first support frame;

[0034] A second support frame is provided on the outer walls of the condenser and the evaporator, and a frequency converter cabinet equipped with the frequency converter is fixed on the second support frame;

[0035] Wire trough brackets are also installed on the first supporting frame and the second supporting frame.

[0036] Compared with the prior art, the single-unit air-suspended variable-frequency centrifugal chiller described in the present invention has the following beneficial effects:

[0037] The utility model describes a single-system air-suspended variable-frequency centrifugal chiller, which can effectively improve its refrigeration efficiency and performance, reduce energy consumption and operating costs, and thus achieve a high-efficiency, energy-saving, and environmentally friendly refrigeration effect; at the same time, the overall structure of the unit is optimized and improved, making the unit more energy-efficient and less noisy, thereby meeting the needs of different industries and fields; at the same time, the air-suspended chiller also has a more flexible installation method and a smaller footprint, providing people with more choices. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the piping of a single-unit air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0040] Figure 2 This is a schematic diagram of the overall structure of a single-unit air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0041] Figure 3 This is a schematic structural diagram from a first angle showing some details of a single-unit air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0042] Figure 4 This is a second-angle structural schematic diagram of some details of a single-machine system air-suspended variable-frequency centrifugal chiller described in an embodiment of the present utility model.

[0043] Description of reference numerals:

[0044] 1. Evaporator; 2. Air-suspension centrifugal compressor; 3. Condenser; 4. Economizer; 5. Frequency converter; 6. First butterfly valve; 7. Needle valve; 8. First electric valve; 9. Check valve; 10. Second butterfly valve; 11. First ball valve; 12. First filter drier; 13. First electronic expansion valve; 14. Second ball valve; 15. First temperature-sensing clamp; 16. Third ball valve; 17. Second temperature-sensing clamp; 18. Second electronic expansion valve; 19. Fourth ball valve; 20. Second electric valve; 21. First stop valve; 22. Second filter drier; 23. First solenoid valve; 24. Third electronic expansion valve; 25. First sight glass. 26. Second stop valve; 27. Third stop valve; 28. Fourth stop valve; 29. ​​Fifth stop valve; 30. Third filter drier; 31. Second solenoid valve; 32. Fourth electronic expansion valve; 33. Second sight glass; 34. Sixth stop valve; 35. Third solenoid valve; 36. Third electric valve; 37. Bracket; 38. Mounting bracket; 39. First pipeline bracket; 40. Second pipeline bracket; 41. Bottom frame; 42. Fixed bracket; 43. First support bracket; 44. Control cabinet; 45. Second support bracket; 46. Frequency converter cabinet; 47. Wire trough bracket; 48. Third pipeline bracket; 49. Third support bracket. DETAILED DESCRIPTION

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0047] The working principle of a traditional chiller can be divided into four processes: compression, condensation, expansion, and evaporation. First, in the compression process, the chiller uses the compressor to compress the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure gas, increasing its internal energy and the heat generated by the compressor. Then, in the condensation process, the high-temperature, high-pressure gas exchanges heat with the external environment in the condenser, being cooled into a high-pressure liquid while releasing a large amount of heat. Next, in the expansion process, the high-pressure liquid is reduced in pressure by the expansion valve and becomes a low-pressure liquid, while the temperature also decreases. Finally, in the evaporation process, the low-pressure liquid enters the evaporator, exchanges heat with the external environment, and evaporates into a low-temperature, low-pressure refrigerant, absorbing heat from the external environment, thereby achieving a cooling effect.

[0048] See also Figure 1 As shown, this embodiment provides a single-unit air suspension variable frequency centrifugal chiller, comprising:

[0049] The main circulation loop is composed of an evaporator 1, an air suspension centrifugal compressor 2, a condenser 3, and an economizer 4 connected by refrigerant pipelines to form a refrigeration cycle loop; wherein the refrigerant pipeline between the condenser 3 and the economizer 4, and the refrigerant pipeline between the economizer 4 and the evaporator 1 are each provided with a throttling pipeline to perform secondary throttling on the liquid refrigerant in the refrigerant pipeline;

[0050] An air supply pipeline, one end of which is connected to the economizer 4 and the other end of which is connected to the air suspension centrifugal compressor 2;

[0051] The variable frequency cooling pipeline includes a frequency converter 5, one end of the frequency converter 5 is connected to the condenser 3 through the frequency converter 5 cooling liquid inlet pipeline, and the other end is connected to the evaporator 1 through the frequency converter 5 cooling return air pipeline.

[0052] Specifically, in this embodiment, the air suspension chiller uses gas suspension technology and is based on the air suspension centrifugal compressor 2. It utilizes the characteristics of the air suspension centrifugal compressor 2, such as high refrigeration effect, good stability, low energy consumption, good environmental protection and low maintenance cost. By arranging secondary throttling devices before and after the economizer 4, and connecting a pipeline between the economizer 4 and the compressor, the gaseous refrigerant returning from the economizer 4 enters the compressor suction port and reaches the middle cavity of the compressor, thereby reducing the temperature of the middle cavity and achieving the effect of replenishing air and increasing enthalpy; at the same time, a variable frequency cooling pipeline is arranged between the condenser 3 and the evaporator 1 to cool the inverter 5; the unit described in this embodiment can effectively improve its refrigeration efficiency and performance, reduce energy consumption and operating costs, and thus achieve a high-efficiency, energy-saving and environmentally friendly refrigeration effect.

[0053] In addition, the overall structure of the unit has been optimized and improved to make the unit more energy-efficient and quieter, thus meeting the needs of different industries and fields; at the same time, the air suspension chiller also has a more flexible installation method and a smaller footprint, providing people with more choices.

[0054] In some embodiments, the primary circulation loop comprises:

[0055] A first circulation branch, one end of which is connected to the evaporator 1, and the other end of which is connected to the air suspension centrifugal compressor 2. The first circulation branch is provided with a first butterfly valve 6, a needle valve 7 and a first electric valve 8;

[0056] A second circulation branch, one end of which is connected to the air suspension centrifugal compressor 2, and the other end of which is connected to the condenser 3. A check valve 9 and a second butterfly valve 10 are provided on the second circulation branch;

[0057] A third circulation branch, one end of which is connected to the condenser 3, and the other end of which is connected to the economizer 4. The third circulation branch is provided with a primary throttling pipeline, a second ball valve 14, and a first temperature-sensing clamp 15. The primary throttling pipeline is composed of a pipeline formed by connecting the first ball valve 11, the first drying filter 12, and the first electronic expansion valve 13;

[0058] A fourth circulation branch, one end of which is connected to the economizer 4, and the other end of which is connected to the evaporator 1. A secondary throttling pipeline and a fourth ball valve 19 are provided on the fourth circulation branch. The secondary throttling pipeline is composed of a pipeline formed by connecting the third ball valve 16, the second temperature-sensing clamp 17, and the second electronic expansion valve 18;

[0059] A second electric valve 20 is provided on the air supply pipeline.

[0060] Specifically, in this embodiment, for the main circulation loop, the liquid refrigerant in the evaporator 1 absorbs heat and vaporizes to become refrigerant vapor, which is sucked into the air-suspended centrifugal compressor 2 through the flange, the first butterfly valve 6, the needle valve 7, the reducer, and the first electric valve 8. The refrigerant is compressed into high-temperature and high-pressure refrigerant vapor, and then flows into the condenser 3 through the flange, the reducer, the check valve 9, the second butterfly valve 10, and the flange. At this time, the refrigerant is condensed into a refrigerant liquid at normal temperature and pressure, and continues to pass through the first ball valve 11 (with needle valve 7) and the first drying filter 12 to enter the first electronic expansion valve 13 for the first throttling. After throttling, the refrigerant is in a gas-liquid two-phase state, and then passes through the second ball valve 14 (with needle valve 7), the first temperature-sensing clamp 15, and the flange to enter the economizer 4.

[0061] Part of the refrigerant absorbs heat and vaporizes in the economizer 4. At this time, the refrigerant is divided into two paths: one path, liquid refrigerant, flows into the second electronic expansion valve 18 through the flange, the third ball valve 16 (with a needle valve 7), and the second temperature-sensitive clamp 17 for secondary throttling. The throttled refrigerant enters the evaporator 1 through the fourth ball valve 19 (with a needle valve 7), completing the refrigeration cycle; the other path, gaseous refrigerant, is connected to the compressor air supply port through the flange, the second electric valve 20, the reducer, and the flange, playing the role of air supply and enthalpy increase.

[0062] In some embodiments, the cooling liquid inlet pipeline of the inverter 5 is provided with a first stop valve 21, a second drying filter 22, a first solenoid valve 23, a third electronic expansion valve 24, a first sight glass 25 and a second stop valve 26;

[0063] The third stop valve 27 and the fourth stop valve 28 are provided on the cooling return air pipeline of the inverter 5;

[0064] The motor cooling liquid inlet pipeline is arranged between the condenser 3 and the compressor, and is provided with a fifth stop valve 29, a third drying filter 30, a second solenoid valve 31, a fourth electronic expansion valve 32, and a second sight glass 33;

[0065] The motor cooling air return pipeline is provided between the compressor and the evaporator 1 , and a sixth shut-off valve 34 is provided on the motor cooling air return pipeline.

[0066] Specifically, in this embodiment, for the auxiliary circulation loop, the refrigerant condensed by the condenser 3 is divided into three paths. The most important path enters the economizer 4 for refrigeration circulation, and the remaining two paths are used for motor cooling and inverter 5 cooling respectively.

[0067] In the motor cooling process, the refrigerant enters the air-suspended centrifugal compressor 2 through the fifth stop valve 29, the third drying filter 30, the second solenoid valve 31, the fourth electronic expansion valve 32, and the second sight glass 33, and performs liquid spray cooling on the motor of the air-suspended centrifugal compressor 2. At this time, the refrigerant absorbs heat and turns into refrigerant vapor, and then enters the evaporator 1 through the fourth reducer and the sixth stop valve 34, completing the motor cooling process.

[0068] The cooling process of the inverter 5 is as follows: the refrigerant enters the inverter 5 through the first stop valve 21, the second drying filter 22, the first solenoid valve 23, the third electronic expansion valve 24, the first sight glass 25, and the second stop valve 26, absorbs heat in the inverter 5 and vaporizes into refrigerant vapor, and then passes through two stop valves (the third stop valve 27 and the fourth stop valve 28) and returns to the evaporator 1, completing the cooling process of the inverter 5.

[0069] In some embodiments, further comprising:

[0070] A pressure protection pipeline, one end of which is connected to the first circulation branch, and the other end of which is connected to the second circulation branch. A third solenoid valve 35 is provided on the pressure protection pipeline.

[0071] Specifically, in this embodiment, the intake and exhaust ports of the air-suspended centrifugal compressor 2 are connected by a flange, a third solenoid valve 35 , and a flange to form a pressure protection pipeline to prevent pressure imbalance from damaging the air-suspended centrifugal compressor 2 .

[0072] In some embodiments, further comprising:

[0073] The hot gas bypass pipeline is provided between the evaporator 1 and the condenser 3 , and a third electric valve 36 is provided on the hot gas bypass pipeline.

[0074] Specifically, in this embodiment, a hot gas bypass pipeline is formed between the condenser 3 and the evaporator 1 by a flange, a third electric valve 36, and a flange connection, which can bypass the high-temperature gaseous refrigerant at the high-pressure end to the low-pressure end of the system, thereby ensuring that the system always operates at a given minimum return air pressure.

[0075] In some embodiments, as Figures 3 and 4 As shown, it also includes a bottom frame 41, on which two layers of fixing brackets 42 are stacked. The condenser 3 and the evaporator 1 are connected to the fixing brackets 42 through flanges, and the evaporator 1 is located above the condenser 3;

[0076] A first support frame 43 is further provided on the outer wall of the condenser 3 , and a control cabinet 44 is mounted on the first support frame 43 ;

[0077] A connecting plate for fixing the economizer 4 is provided on the outer wall of the condenser 3, which is not shown in the drawings;

[0078] A bracket 37 for fixing the first drying filter 12 is also provided on the outer wall of the condenser 3;

[0079] A third pipe bracket 48 is provided on the outer wall of the evaporator 1, and the air supply pipe is fixed to the third pipe bracket 48 by a pipe clamp;

[0080] A second support frame 45 is provided on the outer wall of the condenser 3 and the evaporator 1, and a frequency converter cabinet 46 equipped with the frequency converter 5 is fixed on the second support frame 45;

[0081] A wire trough bracket 47 is also installed on the first support frame 43 and the second support frame 45 for routing the wires of the frequency conversion cabinet 46 and the control cabinet 44;

[0082] A third support frame 49 is further provided on the outer walls of the condenser 3 and the evaporator 1 , and the cooling liquid inlet pipeline of the inverter 5 is fixed to the third support frame 49 through a pipeline.

[0083] Specifically, in this embodiment, the installation design layout of the entire unit is structurally optimized. Around the condenser 3 and the evaporator 1, structural parts such as support frames and brackets 38 provided on the outer walls of the condenser 3 and the evaporator 1 are used to realize the installation of large equipment such as the inverter 5 and the controller, thereby improving the overall high degree of integration of the unit. At the same time, each pipeline is installed and fixed, thereby improving the stability of the pipeline operation of the entire unit.

[0084] Compared with existing chiller pipelines, the overall structure of this unit is simpler, the pipeline installation method is flexible and simple, and the overall unit is highly integrated, occupying a smaller area.

[0085] In some embodiments, as Figure 2As shown, a mounting bracket 38 is provided at the top of the evaporator 1, and the air suspension centrifugal compressor 2 is fixed on the mounting bracket 38 by fastening bolts.

[0086] The mounting bracket 38 is further provided with a first pipe bracket 39 and a second pipe bracket 40. The motor cooling liquid inlet pipe and the motor cooling air return pipe are fixed to the first pipe bracket 39 by pipe clamps.

[0087] The pressure protection pipeline is fixed to the second pipeline support 40 by a pipe clamp.

[0088] Specifically, in this embodiment, the air-suspended centrifugal compressor 2 is arranged at the top of the evaporator 1 through the mounting bracket 38, which effectively improves the space utilization rate, and multiple pipeline brackets are arranged on the mounting bracket 38 to provide fixed points for installing multiple pipelines, thereby improving the stable operation of each pipeline.

[0089] The unit described in this embodiment enables the various components to cooperate efficiently, and while utilizing the safety and energy-saving characteristics of the air-suspended centrifugal compressor 2, it maximizes the refrigeration efficiency, reduces maintenance costs, improves system stability, and the overall unit pipeline layout is reasonable and reliable, and occupies a small area. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that it is still possible to modify the technical solutions recorded in the above embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the various embodiments of the utility model, and they should all be covered by the scope of the claims and description of the utility model.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single-unit air suspension variable frequency centrifugal chiller, characterized in that: include: The main circulation loop is composed of an evaporator, an air suspension centrifugal compressor, a condenser, and an economizer connected by refrigerant pipelines to form a refrigeration circulation loop; wherein the refrigerant pipeline between the condenser and the economizer, and the refrigerant pipeline between the economizer and the evaporator are each provided with a throttling pipeline to perform secondary throttling on the liquid refrigerant in the refrigerant pipeline; an air supply pipeline, one end of which is connected to the economizer, and the other end of which is connected to the air suspension centrifugal compressor; A variable frequency cooling pipeline includes a frequency converter, one end of the frequency converter is connected to the condenser through a frequency converter cooling liquid inlet pipeline, and the other end is connected to the evaporator through a frequency converter cooling air return pipeline.

2. The single-unit air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The main circulation loop comprises: a first circulation branch, one end of which is connected to the evaporator, and the other end of which is connected to the air suspension centrifugal compressor, wherein a first butterfly valve, a needle valve and a first electric valve are provided on the first circulation branch; a second circulation branch, one end of the second circulation branch being connected to the air suspension centrifugal compressor and the other end being connected to the condenser, and the second circulation branch being provided with a check valve and a second butterfly valve; a third circulation branch, one end of the third circulation branch being connected to the condenser and the other end being connected to the economizer, the third circulation branch being provided with a primary throttling pipeline, a second ball valve, and a first temperature-sensing clamp, wherein the primary throttling pipeline is composed of a pipeline formed by connecting the first ball valve, the first filter drier, and the first electronic expansion valve; A fourth circulation branch, one end of which is connected to the economizer, and the other end of which is connected to the evaporator, is provided with a secondary throttling pipeline and a fourth ball valve, wherein the secondary throttling pipeline is composed of a pipeline formed by connecting the third ball valve, the second temperature sensing clip and the second electronic expansion valve.

3. The single-unit air suspension variable frequency centrifugal chiller according to claim 2, characterized in that: A connecting plate for fixing the economizer is provided on the outer wall of the condenser; A bracket for fixing the first drying filter is also provided on the outer wall of the condenser.

4. The single-unit air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: A second electric valve is provided on the air supply pipeline.

5. The single-unit air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The inverter cooling liquid inlet pipeline is provided with a first stop valve, a second drying filter, a first solenoid valve, a third electronic expansion valve, a first sight glass and a second stop valve; The inverter cooling return air pipeline is provided with a third stop valve and a fourth stop valve.

6. The single-unit air suspension variable frequency centrifugal chiller according to claim 2, characterized in that: Also includes; a motor cooling liquid inlet pipeline, the motor cooling liquid inlet pipeline being arranged between the condenser and the compressor, and being provided with a fifth stop valve, a third drying filter, a second solenoid valve, a fourth electronic expansion valve, and a second sight glass; The motor cooling air return pipeline is arranged between the compressor and the evaporator, and a sixth shut-off valve is provided on the motor cooling air return pipeline.

7. The single-unit air suspension variable frequency centrifugal chiller according to claim 6, characterized in that: The top of the evaporator is provided with a mounting bracket, and the air suspension centrifugal compressor is fixed on the mounting bracket by fastening bolts. The mounting bracket is further provided with a first pipe bracket and a second pipe bracket, and the motor cooling liquid inlet pipe and the motor cooling air return pipe are fixed to the first pipe bracket through pipe clamps; The pressure protection pipeline is fixed to the second pipeline support through a pipe clamp.

8. The single-unit air suspension variable frequency centrifugal chiller according to claim 7, characterized in that: One end of the pressure protection pipeline is connected to the first circulation branch, and the other end is connected to the second circulation branch. A third solenoid valve is provided on the pressure protection pipeline.

9. The single-unit air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: Also includes: A hot gas bypass pipeline is provided between the evaporator and the condenser, and a third electric valve is provided on the hot gas bypass pipeline.

10. The single-unit air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: It also includes a bottom frame, on which two layers of fixing brackets are stacked, the condenser and the evaporator are both connected to the fixing brackets through flanges, and the evaporator is located above the condenser; A first support frame is further provided on the outer wall of the condenser, and a control cabinet is installed on the first support frame; A second support frame is provided on the outer walls of the condenser and the evaporator, and a frequency converter cabinet equipped with the frequency converter is fixed on the second support frame; Wire trough brackets are also installed on the first supporting frame and the second supporting frame.

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