Double-unit-system air-suspension variable-frequency centrifugal water chilling unit

Abstract

The utility model provides a double-unit system air suspension frequency conversion centrifugal water chilling unit which comprises a bottom frame, a condenser, an evaporator and an economizer, the condenser, the evaporator and the economizer are arranged on the bottom frame, two compressors are arranged at the top end of the evaporator, and the evaporator is correspondingly connected with the two compressors through two air suction pipelines and two motor cooling air return pipelines respectively. The condenser is correspondingly connected with the two compressors through two exhaust pipelines and two motor cooling liquid inlet pipelines respectively; a first-stage throttling pipeline is arranged between the condenser and the economizer, and a second-stage throttling pipeline is arranged between the evaporator and the economizer; the system further comprises two frequency converters which are both located above the condenser, one end of each frequency converter is connected with the evaporator through a frequency converter cooling air return pipeline, and the other end of each frequency converter is connected with the condenser through a frequency converter cooling liquid inlet pipeline. The unit provided by the utility model is compact in structure, smaller in size, lower in energy consumption, higher in refrigeration efficiency and more stable in whole machine operation.

Description

Technical Field

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

[0002] Currently, the mainstream centrifugal chillers are magnetic levitation centrifugal chillers (using magnetic levitation compressors) and air levitation centrifugal chillers (using air levitation compressors). Magnetic levitation compressors have long dominated the market for small-capacity centrifugal refrigerant compressors. However, magnetic levitation bearings are bulky, have complex control systems, and have a limited ability to withstand drops in the event of an abnormal power outage. Damage to the backup bearing can cause the entire compressor to malfunction, impacting the chiller's operation.

[0003] In comparison, the air bearings used in air-levitated compressors offer low friction loss, high temperature resistance, and a simple structure, making them the ideal supporting component to replace magnetic bearings. However, existing chillers using air-levitated compressors suffer from poor cooling performance, high energy consumption, and bulky units. The resulting large footprint, caused by an illogical structural layout, continues to hinder the use and development of air-levitated centrifugal chillers. Utility Model Content

[0004] In view of this, the present invention aims to provide a dual-system air-suspended variable-frequency centrifugal chiller, in order to solve at least one of the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0006] The utility model provides a dual-system air-suspension variable-frequency centrifugal chiller, comprising:

[0007] A bottom frame, and a condenser, an evaporator, and an economizer arranged on the bottom frame, wherein the economizer is located below the evaporator, two compressors are installed on the top of the evaporator, and the two compressors are arranged at intervals. The evaporator is connected to the two compressors respectively through two suction pipes and two motor cooling return pipes, and the condenser is connected to the two compressors respectively through two exhaust pipes and two motor cooling liquid inlet pipes;

[0008] A primary throttling pipeline is provided between the condenser and the economizer, and a secondary throttling pipeline is provided between the evaporator and the economizer;

[0009] It also includes two frequency converters, both of which are located above the condenser, one end of each set of frequency converters is connected to the evaporator through the frequency converter cooling return air pipeline, and the other end is connected to the condenser through the frequency converter cooling liquid inlet pipeline;

[0010] The economizer is connected to the two compressors respectively through two air supply pipelines, and a hot air bypass pipeline is also provided between the evaporator and the condenser.

[0011] Furthermore, the condenser and the evaporator are fixed by tube sheets parallel to each other on both sides, and the bottom ends of the tube sheets are provided with feet, which are mounted on the bottom frame by fastening bolts;

[0012] The bottom frame is further provided with a first fixing bracket for supporting the condenser, the evaporator and the bottom of the economizer.

[0013] Furthermore, the frequency converter is installed in a frequency conversion control cabinet, and two second fixing brackets arranged in parallel are installed on the top of the condenser, and the two frequency conversion control cabinets are respectively correspondingly arranged on the two second fixing brackets;

[0014] The inverter cooling liquid inlet pipeline is arranged in the gap reserved between the evaporator and the condenser, and the pipeline is reinforced by pipe clamps provided on the evaporator and the condenser;

[0015] The inverter cooling liquid inlet pipeline is provided with a first angle valve, a first drying filter, a first sight glass, a first solenoid valve, a first electronic expansion valve and a second angle valve.

[0016] Furthermore, the inverter cooling return air pipeline includes a main pipeline and a branch pipeline connected to the main pipeline, the main pipeline is composed of a third angle valve, a first conversion joint, a first copper branch pipe, a T-shaped three-way piece, a second copper branch pipe, a second conversion joint, and a fourth angle valve, the branch pipeline is composed of a third copper branch pipe, a third conversion joint and a fifth angle valve, and the third copper branch pipe is connected to the T-shaped three-way piece;

[0017] The third angle valve and the fourth angle valve are connected to two frequency converters respectively, and the fifth angle valve is connected to the evaporator.

[0018] Furthermore, the motor cooling liquid inlet pipeline is composed of a fourth conversion joint, a fourth copper branch, a second electronic expansion valve, a fifth copper branch, a second sight glass, a sixth copper branch, a second solenoid valve, a seventh copper pipeline, a second drying filter, an eighth copper pipeline and a fifth conversion joint. The fourth conversion joint is connected to the angle valve provided on the compressor, and the fifth conversion joint is connected to the angle valve provided on the condenser.

[0019] Among them, the fourth copper branch pipe and the fifth copper branch pipe are arranged vertically and fixed by a connecting bracket. A third fixing bracket is provided on the cylinder of the evaporator, and the sixth copper branch pipe is fixed to the third fixing bracket by a pipe clamp. A fourth fixing bracket is provided on the cylinder of the condenser, and the seventh copper branch pipe is fixed to the fourth fixing bracket by a pipe clamp.

[0020] Furthermore, the primary throttling pipeline and the secondary throttling pipeline are both arranged below the evaporator and the condenser, and are fixed by a fifth fixing bracket;

[0021] The first-level throttling pipeline is provided with a first ball valve, a drying filter cartridge, a third electronic expansion valve and a second ball valve;

[0022] The secondary throttling pipeline is provided with a third ball valve, a fourth electronic expansion valve and a fourth ball valve.

[0023] Furthermore, a first butterfly valve is provided on the air intake pipe;

[0024] The exhaust pipeline is provided with a second butterfly valve and a one-way valve.

[0025] Furthermore, a third solenoid valve is provided on the air supply pipeline;

[0026] A third butterfly valve is provided on the hot gas bypass pipeline.

[0027] Furthermore, it also includes a shutdown pipeline, which connects the intake pipeline and the exhaust pipeline, and is provided with a fourth solenoid valve.

[0028] Furthermore, the two compressors are both arranged on the top of the evaporator via a sixth fixing bracket installed at the bottom;

[0029] The frequency converter is installed in a frequency conversion control cabinet. Two seventh fixing brackets arranged in parallel are installed on the top of the condenser. The two frequency conversion control cabinets are respectively arranged on the two seventh fixing brackets.

[0030] Compared with the prior art, the dual-system air-suspension variable-frequency centrifugal chiller described in the present invention has the following beneficial effects:

[0031] The utility model describes a dual-system air-suspended variable-frequency centrifugal chiller unit, which utilizes the characteristics of an air-suspended centrifugal compressor and rationally arranges the various parts of the entire unit. The unit has a compact structure and smaller size, lower energy consumption, higher cooling efficiency, and more stable operation of the entire unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 This is a front view of a dual-system air-suspension variable-frequency centrifugal chiller according to an embodiment of the present utility model;

[0034] Figure 2 This is a schematic structural diagram from a first angle of a dual-system air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0035] Figure 3 This is a top view of a dual-system air-suspended variable-frequency centrifugal chiller according to an embodiment of the present utility model;

[0036] Figure 4 This is a side view of a dual-system air-suspension variable-frequency centrifugal chiller according to an embodiment of the present utility model;

[0037] Figure 5 This is a schematic diagram of the partial details of the structure of a dual-system air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0038] Figure 6 This is a schematic diagram of the motor cooling liquid inlet pipeline structure according to an embodiment of the present utility model;

[0039] Figure 7 This is a schematic diagram of the structure of the inverter cooling return air pipeline according to an embodiment of the present utility model;

[0040] Figure 8 This is a schematic diagram of a dual-system air-suspended variable-frequency centrifugal chiller system described in an embodiment of the present utility model.

[0041] Description of reference numerals:

[0042] 1. Base frame; 2. Condenser; 3. Evaporator; 4. Economizer; 5. Compressor; 6. Frequency conversion control cabinet; 7. Intake pipe; 8. Motor cooling return pipe; 9. Exhaust pipe; 10. Motor cooling liquid inlet pipe; 1001. Fourth conversion joint; 1002. Fourth copper branch pipe; 1003. Second electronic expansion valve; 1004. Fifth copper branch pipe; 1005. Second sight glass; 1006. Sixth copper branch pipe; 1007. Second solenoid valve; 1008. Seventh copper pipe; 1009. Second filter drier; 1010. Eighth copper pipe; 1011. Fifth conversion joint; 11. First-stage throttling pipe; 12. Second-stage throttling pipe; 13. Frequency converter Cooling return air pipeline; 1301, third angle valve; 1302, first conversion joint; 1303, first copper branch pipe; 1304, T-type tee; 1305, second copper branch pipe; 1306, second conversion joint; 1307, fourth angle valve; 1308, third copper branch pipe; 1309, third conversion joint; 1310, fifth angle valve; 14, inverter cooling liquid inlet pipeline; 15, air supply pipeline; 16, hot gas bypass pipeline; 17, shutdown pipeline; 18, tube sheet; 19, anchor; 20, first fixed bracket; 21, second fixed bracket; 22, third fixed bracket; 23, fourth fixed bracket; 24, fifth fixed bracket; 25, sixth fixed bracket. DETAILED DESCRIPTION

[0043] 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.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0045] See also Figures 1 to 5 As shown in FIG8 , this embodiment provides a dual-system air suspension variable frequency centrifugal chiller, including:

[0046] A bottom frame 1, and a condenser 2, an evaporator 3, and an economizer 4 (i.e., a flash unit) disposed on the bottom frame 1. The economizer 4 is located below the evaporator 3. Two compressors 5 are installed on the top of the evaporator 3. The two compressors 5 are spaced apart and are mounted on the top of the evaporator 3 via a sixth fixing bracket 25 mounted on the bottom. The evaporator 3 is connected to the two compressors 5 via two suction lines 7 and two motor cooling return lines 8, respectively. The condenser 2 is connected to the two compressors 5 via two exhaust lines 9 and two motor cooling liquid inlet lines 10, respectively.

[0047] A primary throttling pipe 11 is provided between the condenser 2 and the economizer 4, and a secondary throttling pipe 12 is provided between the evaporator 3 and the economizer 4;

[0048] It also includes two frequency converters, both of which are located above the condenser 2. One end of each set of frequency converters is connected to the evaporator 3 through the frequency converter cooling return air pipeline 13, and the other end is connected to the condenser 2 through the frequency converter cooling liquid inlet pipeline 14;

[0049] The economizer 4 is connected to the two compressors 5 through two air supply pipelines 15 respectively, and a hot air bypass pipeline 16 is also provided between the evaporator 3 and the condenser 2.

[0050] Specifically, in this embodiment, the complete unit described in the present application adopts two compressors 5 and two inverters, and the pipeline design is centered around an evaporator 3, a condenser 2, an economizer 4, two compressors 5, and two inverters. The low-temperature, low-pressure refrigerant gas enters the compressor 5, and becomes a high-temperature, high-pressure gas after compression. It is discharged from the compressor 5 and enters the condenser 2 to exchange heat with the cooling water, and is condensed into a medium-temperature, high-pressure refrigerant liquid. After passing through the first-level throttling of the expansion valve and reducing the pressure to an intermediate pressure, it enters the economizer 4 and absorbs heat through the throttling evaporation of the refrigerant itself, thereby supercooling another part of the refrigerant. The refrigerant gas after absorbing heat enters the medium-pressure chamber of the compressor 5 due to the pressure difference to replenish air. The supercooled liquid in the economizer 4 passes through the second-level throttling of the expansion valve and enters the evaporator 3 to absorb the heat of the chilled water and evaporate, and then enters the suction chamber of the compressor 5 to participate in compression. This cycle completes the refrigeration process.

[0051] During this cycle, in order to avoid affecting the working efficiency of the compressor 5 due to the high temperature of the motor of the compressor 5, when the temperature of the motor of the compressor 5 is high, the refrigerant liquid enters the compressor 5 cooling motor through the motor cooling liquid inlet pipe 10, absorbs heat and returns to the evaporator 3 through the motor cooling return air pipe 8; similarly, a refrigerant cooling method is also set for the frequency converter in the frequency conversion control cabinet 6, and the refrigerant liquid at the bottom of the condenser 2 is used to cool it, and the refrigerant gas that absorbs heat returns to the evaporator 3.

[0052] When the compressor 5 surges or is unloaded, the hot gas bypass line 16 plays its role. By controlling the hot gas bypass valve to open, the high-temperature gaseous refrigerant at the high-pressure end is bypassed to the low-pressure end of the system, balancing the pressure between the evaporator 3 and the condenser 2, so that the system can achieve stable and efficient operation.

[0053] The compressor 5 used in this application is a dynamic pressure air suspension centrifugal compressor 5. By utilizing the characteristics of the air suspension centrifugal compressor 5 itself and rationally arranging the various parts of the entire unit, the unit structure is compact and smaller in size. The unit itself has lower energy consumption, higher refrigeration efficiency, and more stable operation of the entire unit.

[0054] In some embodiments, the condenser 2 and the evaporator 3 are fixed by tube sheets 18 arranged in parallel on both sides. The bottom end of the tube sheet 18 is provided with a foot 19, and the foot 19 is mounted on the bottom frame 1 by fastening bolts.

[0055] The bottom frame 1 is further provided with a first fixing bracket 20 for supporting the bottom of the condenser 2 , the evaporator 3 and the economizer 4 .

[0056] Specifically, in this embodiment, by adopting flange-connected water covers for both the condenser 2 and the evaporator 3, and connecting and fixing them by welding the tube sheet 18, and providing feet 19 at the bottom of the tube sheet 18 and installing them on the bottom frame 1, the overall installation and fixation of the condenser 2 and the evaporator 3 can be achieved, and based on this, the pipeline design of the entire unit is laid out; in addition, in order to ensure the stable operation of the condenser 2, the evaporator 3 and the economizer 4, this embodiment provides a fixed bracket at the bottom of each device, and the fixed bracket is installed on the bottom frame 1, which can effectively improve the operating stability of the unit.

[0057] The overall design structure of the unit is reasonable, and the gaps between the equipment are effectively used for piping installation. The structure of the whole unit is more compact, occupies less space, and is simple and easy for operators to assemble and disassemble, effectively reducing the labor intensity of operators.

[0058] In some embodiments, the frequency converter is installed in the frequency conversion control cabinet 6, and two second fixing brackets 21 arranged in parallel are installed on the top of the condenser 2, and the two frequency conversion control cabinets 6 are respectively installed on the two second fixing brackets 21;

[0059] The inverter cooling liquid inlet pipeline 14 is set in the gap reserved between the evaporator 3 and the condenser 2, and the pipeline is reinforced by the pipe clamps set on the evaporator 3 and the condenser 2;

[0060] The inverter cooling liquid inlet pipeline 14 is provided with a first angle valve, a first drying filter, a first sight glass, a first solenoid valve, a first electronic expansion valve and a second angle valve;

[0061] like Figure 7 As shown, the inverter cooling return air pipeline 13 includes a main pipeline and a branch pipeline connected to the main pipeline. The main pipeline is composed of a third angle valve 1301, a first conversion joint 1302, a first copper branch pipe 1303, a T-shaped three-way piece 1304, a second copper branch pipe 1305, a second conversion joint 1306, and a fourth angle valve 1307. The branch pipeline is composed of a third copper branch pipe 1308, a third conversion joint 1309, and a fifth angle valve 1310. The third copper branch pipe 1308 is connected to the T-shaped three-way piece 1304.

[0062] The third angle valve 1301 and the fourth angle valve 1307 are connected to two frequency converters respectively, and the fifth angle valve 1310 is connected to the evaporator 3 .

[0063] Specifically, in this embodiment, the inverter control cabinet belongs to a high-voltage control cabinet. This application is connected to the inverter cooling liquid inlet angle valves of each high-voltage control cabinet through two sets of inverter cooling liquid inlet pipelines 14, and the inverter cooling return air angle valves of the two high-voltage control cabinets are respectively connected to the two angle valves above the evaporator 3 cylinder through the inverter cooling return air pipeline 13.

[0064] In this application, the inverter cooling liquid inlet pipeline 14 and the inverter cooling air return pipeline 13 are rationally arranged according to the gaps reserved between the various devices, and each pipeline is erected and fixed, which effectively improves the space utilization of the unit while ensuring the stable operation of the entire unit.

[0065] In addition, this application also sets up a weak-current control cabinet between the two frequency conversion control cabinets 6. The two compressors 5 are electrically connected to the two strong-current control cabinets respectively, and the weak-current control cabinets are electrically connected to the strong-current control cabinets and electronic control components respectively. For the electronic control part, this application does not go into details.

[0066] In some embodiments, as Figure 6 As shown, the motor cooling liquid inlet pipeline 10 is composed of a fourth conversion joint 1001, a fourth copper branch pipe 1002, a second electronic expansion valve 1003, a fifth copper branch pipe 1004, a second sight glass 1005, a sixth copper branch pipe 1006, a second solenoid valve 1007, a seventh copper pipe 1008, a second drying filter 1009, an eighth copper pipe 1010 and a fifth conversion joint 1011. The fourth conversion joint 1001 is connected to the angle valve provided on the compressor 5, and the fifth conversion joint 1011 is connected to the angle valve provided on the condenser 2.

[0067] Among them, the fourth copper branch 1002 and the fifth copper branch 1004 are arranged vertically and fixed by a connecting bracket. A third fixing bracket 22 is provided on the cylinder of the evaporator 3, and the sixth copper branch 1006 is fixed on the third fixing bracket 22 by a pipe clamp. A fourth fixing bracket 23 is provided on the cylinder of the condenser 2, and the seventh copper branch is fixed on the fourth fixing bracket 23 by a pipe clamp.

[0068] Specifically, in this embodiment, the two angle valves below the cylinder of the condenser 2 are connected to the motor cooling liquid inlet angle valves of the two compressors 5 respectively through two sets of motor cooling liquid inlet pipelines 10, and the motor cooling return air ports of the two compressors 5 are connected to the angle valve above the cylinder of the evaporator 3 through the motor cooling return air pipeline 8;

[0069] The motor cooling liquid inlet pipeline 10 is composed of a copper tube, a conversion joint, a drying filter, a motor cooling solenoid valve, a sight glass, an electronic expansion valve and an angle valve, and the motor cooling air return pipeline 8 is composed of a copper tube, a conversion joint and an angle valve.

[0070] In some embodiments, the primary throttling line 11 and the secondary throttling line 12 are both disposed below the evaporator 3 and the condenser 2 and fixed by a fifth fixing bracket 24;

[0071] The first-level throttling pipeline 11 is provided with a first ball valve, a drying filter cartridge, a third electronic expansion valve and a second ball valve;

[0072] The secondary throttling pipeline 12 is provided with a third ball valve, a fourth electronic expansion valve and a fourth ball valve.

[0073] Specifically, in this embodiment, the output end of the condenser 2 is connected to the economizer 4 through the primary throttling pipeline 11, and the economizer 4 is connected to the evaporator 3 through the secondary throttling pipeline 12; the primary throttling component includes a steel pipe, a copper pipe, a ball valve, a drying filter cartridge, and a first electronic expansion valve, and the secondary throttling component includes a steel pipe, a copper pipe, a ball valve, and a second electronic expansion valve 1003.

[0074] In some embodiments, a first butterfly valve is provided on the suction line 7;

[0075] A second butterfly valve and a one-way valve are provided on the exhaust pipe 9;

[0076] The system further includes a shutdown pipeline 17 , which connects the air intake pipeline 7 and the air exhaust pipeline 9 , and a fourth solenoid valve is provided on the shutdown pipeline 17 .

[0077] Specifically, in this embodiment, the output end of the evaporator 3 is connected to the input ends of the two compressors 5 through two sets of suction pipes 7, and the exhaust pipes 9 of the two compressors 5 are connected to the suction pipes of the two compressors 5 through two sets of shutdown pipes 17. The exhaust pipe 9 includes a steel pipe, a one-way valve and a manual butterfly valve, the suction pipe 7 includes a steel pipe and a manual butterfly valve, and the shutdown pipe 17 includes a copper pipe and a shutdown solenoid valve.

[0078] In some embodiments, a third solenoid valve is provided on the air supply line 15;

[0079] A third butterfly valve is provided on the hot gas bypass pipeline 16 .

[0080] Specifically, in this embodiment, the two output ends above the cylinder of the economizer 4 are respectively connected to the air supply ports of the two compressors 5 through two sets of air supply pipelines 15, and the hot gas bypass pipeline 16 is connected between the evaporator 3 and the condenser 2, wherein the air supply pipeline 15 includes a copper pipe and an air supply solenoid valve, and the hot gas bypass pipeline 16 includes a steel pipe and an electric butterfly valve.

[0081] The unit described in this application also includes three high-pressure sensors, two low-pressure sensors, two high-pressure switches, two low-pressure switches, and 11 temperature sensors, each electrically connected to the control device. Each compressor 5's intake line 7 is provided with a low-pressure sensor, a low-pressure switch, and a temperature sensor; each compressor 5's exhaust line 9 is provided with a high-pressure sensor, a high-pressure switch, and a temperature sensor; a high-pressure sensor is provided on the economizer 4 cylinder; and the remaining temperature sensors are provided on the motor cavities of the two compressors 5, on the two secondary compression lines of the two compressors 5, in front of the electronic expansion valve of the first throttling line 11, and in front of the electronic expansion valve of the second throttling line 12.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0083] 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 dual-system air suspension variable frequency centrifugal chiller, characterized in that: include: A bottom frame, and a condenser, an evaporator, and an economizer arranged on the bottom frame, wherein the economizer is located below the evaporator, two compressors are installed on the top of the evaporator, and the two compressors are arranged at intervals. The evaporator is connected to the two compressors respectively through two suction pipes and two motor cooling return pipes, and the condenser is connected to the two compressors respectively through two exhaust pipes and two motor cooling liquid inlet pipes; A primary throttling pipeline is provided between the condenser and the economizer, and a secondary throttling pipeline is provided between the evaporator and the economizer; It also includes two frequency converters, both of which are located above the condenser, one end of each set of frequency converters is connected to the evaporator through the frequency converter cooling return air pipeline, and the other end is connected to the condenser through the frequency converter cooling liquid inlet pipeline; The economizer is connected to the two compressors respectively through two air supply pipelines, and a hot air bypass pipeline is also provided between the evaporator and the condenser.

2. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The condenser and the evaporator are fixed by parallel tube sheets on both sides, and the bottom ends of the tube sheets are provided with feet, which are mounted on the bottom frame by fastening bolts; The bottom frame is further provided with a first fixing bracket for supporting the condenser, the evaporator and the bottom of the economizer.

3. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The frequency converter is installed in a frequency conversion control cabinet, and two second fixing brackets arranged in parallel are installed on the top of the condenser, and the two frequency conversion control cabinets are respectively correspondingly arranged on the two second fixing brackets; The inverter cooling liquid inlet pipeline is arranged in the gap reserved between the evaporator and the condenser, and the pipeline is reinforced by pipe clamps provided on the evaporator and the condenser; The inverter cooling liquid inlet pipeline is provided with a first angle valve, a first drying filter, a first sight glass, a first solenoid valve, a first electronic expansion valve and a second angle valve.

4. The dual-system air suspension variable frequency centrifugal chiller according to claim 3, characterized in that: The inverter cooling return air pipeline includes a main pipeline and a branch pipeline connected to the main pipeline, the main pipeline is composed of a third angle valve, a first conversion joint, a first copper branch pipe, a T-shaped three-way piece, a second copper branch pipe, a second conversion joint, and a fourth angle valve, the branch pipeline is composed of a third copper branch pipe, a third conversion joint and a fifth angle valve, and the third copper branch pipe is connected to the T-shaped three-way piece; The third angle valve and the fourth angle valve are connected to two frequency converters respectively, and the fifth angle valve is connected to the evaporator.

5. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The motor cooling liquid inlet pipeline is composed of a fourth conversion joint, a fourth copper branch, a second electronic expansion valve, a fifth copper branch, a second sight glass, a sixth copper branch, a second solenoid valve, a seventh copper branch, a second drying filter, an eighth copper pipeline and a fifth conversion joint. The fourth conversion joint is connected to the angle valve provided on the compressor, and the fifth conversion joint is connected to the angle valve provided on the condenser. Among them, the fourth copper branch pipe and the fifth copper branch pipe are arranged vertically and fixed by a connecting bracket. A third fixing bracket is provided on the cylinder of the evaporator, and the sixth copper branch pipe is fixed to the third fixing bracket by a pipe clamp. A fourth fixing bracket is provided on the cylinder of the condenser, and the seventh copper branch pipe is fixed to the fourth fixing bracket by a pipe clamp.

6. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The primary throttling pipeline and the secondary throttling pipeline are both arranged below the evaporator and the condenser, and are fixed by a fifth fixing bracket; The first-level throttling pipeline is provided with a first ball valve, a drying filter cartridge, a third electronic expansion valve and a second ball valve; The secondary throttling pipeline is provided with a third ball valve, a fourth electronic expansion valve and a fourth ball valve.

7. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: A first butterfly valve is provided on the suction pipe; The exhaust pipeline is provided with a second butterfly valve and a one-way valve.

8. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: A third solenoid valve is provided on the air supply pipeline; A third butterfly valve is provided on the hot gas bypass pipeline.

9. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: It also includes a shutdown pipeline, which connects the intake pipeline and the exhaust pipeline, and is provided with a fourth solenoid valve.

10. The dual-system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The two compressors are both arranged on the top of the evaporator through a sixth fixing bracket installed at the bottom.

Images