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

Abstract

The utility model provides a three-unit system air suspension frequency conversion centrifugal water chilling unit which is characterized in that an evaporator and a condenser are arranged on a supporting frame side by side, an economizer is arranged below the condenser, one end of the economizer is connected with the condenser through a first-stage throttling pipeline, and the other end of the economizer is connected with the evaporator through a second-stage throttling pipeline; the number of the compressors and the number of the frequency converters are both three, the three compressors are arranged above the condenser at intervals, and each compressor is connected with the evaporator through an air suction pipeline and a motor cooling air return pipeline and connected with the condenser through an exhaust pipeline and a motor cooling liquid inlet pipeline. 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 utility model has the characteristics of low energy consumption, high refrigeration efficiency, more energy conservation and environmental protection, compact unit structure, higher integration and small occupied space.

Description

Technical Field

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

[0002] In the refrigeration industry, suspension technology has outstanding performance in refrigeration efficiency, overall machine reliability, and other aspects because the entire system is oil-free, the compressor drive shaft has no friction, and the noise is much lower than that of traditional compressors. It also has low maintenance costs during use and is highly accepted in the aftermarket replacement market.

[0003] Among them, magnetic levitation technology has become mature. Many manufacturers in the market today can produce magnetic levitation compressors and air-conditioning refrigeration units. However, the control of magnetic levitation technology is relatively complex and the control technology threshold is high. Gas levitation, which is also an oil-free suspension technology, is favored by many consumer groups because of its relatively simple control, high reliability, high unit energy efficiency and low maintenance cost.

[0004] However, the overall structural layout of the air-suspended unit is unreasonable, resulting in a large unit size and a large occupied area. During installation and design, the piping layout is relatively messy, resulting in high workload for operators. At the same time, the existing unit has high energy consumption and poor cooling effect, which does not conform to the concept of energy conservation and environmental protection. Utility Model Content

[0005] In view of this, the present invention aims to provide a three-machine system air-suspended variable frequency centrifugal chiller, in order to solve at least one of the above-mentioned technical problems.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0007] The utility model provides a three-machine system air suspension variable frequency centrifugal chiller, comprising an evaporator, a condenser, an economizer, a compressor and a frequency converter;

[0008] The evaporator and the condenser are arranged side by side on a supporting frame, the economizer is arranged below the condenser, one end of the economizer is connected to the condenser through a primary throttling pipeline, and the other end is connected to the evaporator through a secondary throttling pipeline, wherein the primary throttling pipeline and the secondary throttling pipeline are arranged below the economizer;

[0009] The number of the compressor and the frequency converter is three, and the three compressors are arranged above the condenser at intervals. Each compressor is connected to the evaporator through an air suction line and a motor cooling return line, and is connected to the condenser through an air discharge line and a motor cooling liquid inlet line.

[0010] The inverter is installed in the inverter control cabinet. The three inverter control cabinets are mounted on the side wall of the condenser through fixed brackets and arranged corresponding to the three compressors. One end of each inverter is connected to the evaporator through the inverter cooling return air pipeline, and the other end is connected to the condenser through the inverter cooling liquid inlet pipeline.

[0011] The economizer is connected to the three compressors respectively through three groups of air supply pipelines, and a hot air bypass pipeline is also connected between the evaporator and the condenser.

[0012] Furthermore, the support frame includes tube sheets arranged in parallel on both sides, and the bottom of the tube sheets is provided with feet;

[0013] The two ends of the evaporator and the condenser are fixedly connected to the tube sheets on both sides through flanges respectively, and the economizer is arranged below the condenser through a connecting bracket.

[0014] Furthermore, the primary throttling pipeline is composed of a first stop valve, a first throttling steel pipe, a drying filter cartridge, a second throttling steel pipe, a first reducer, a third throttling steel pipe, a first electric ball valve, a fourth throttling steel pipe, a second reducer, a first elbow, a fifth throttling steel pipe, and a second stop valve, wherein the first stop valve is arranged at the liquid outlet of the condenser, the second stop valve is arranged at the liquid inlet of the economizer, and the third throttling steel pipe and the fourth throttling steel pipe are connected to the flange of the first electric ball valve through flanges arranged thereon;

[0015] The secondary throttling pipeline is composed of a third stop valve, a fourth throttling steel pipe, a third reducer, a second electric ball valve, a fourth reducer, a second elbow, a fifth throttling steel pipe, and a fourth stop valve, wherein the third stop valve is arranged at the liquid inlet of the evaporator, and the fourth stop valve is arranged at the liquid outlet of the economizer.

[0016] Furthermore, the compressor is arranged on the top of the cylinder of the condenser through a mounting bracket connected at the bottom;

[0017] The suction pipe is composed of a suction pipe, a fifth reducer, a third elbow, a first flange and a first butterfly valve, the suction pipe is arranged at the air inlet of the compressor, the first flange is connected to the air outlet of the evaporator, and the first butterfly valve is arranged at the air outlet;

[0018] The exhaust pipeline is composed of a sixth reducer, a first exhaust pipe, a fourth elbow, a second exhaust pipe, a second flange, a check valve, a third flange, a third exhaust pipe, a fourth flange, and a second butterfly valve. The sixth reducer is connected to the air outlet of the compressor, the fourth flange is connected to the air inlet of the condenser, and the second butterfly valve is arranged at the air inlet.

[0019] Furthermore, three groups of shutdown pipelines are included, one end of each group of shutdown pipelines is connected to the intake pipe, and the other end is connected to the first exhaust pipe, and a first solenoid valve is provided on the shutdown pipeline.

[0020] Furthermore, the inverter cooling liquid inlet pipeline is arranged in a gap reserved between the inverter control cabinet and the condenser, and a second solenoid valve, a first electronic expansion valve, a first sight glass, a first drying filter, a first angle valve and a second angle valve are provided on the inverter cooling liquid inlet pipeline;

[0021] The inverter cooling return air pipeline is arranged above the evaporator and the condenser, and a third angle valve is provided on the inverter cooling return air pipeline.

[0022] Furthermore, the air supply pipeline includes an air supply main pipe and three air supply branches connected to the air supply main pipe. The air supply main pipe is connected to the air supply outlet of the economizer through a flange. A third butterfly valve is also installed at the air supply outlet of the economizer. The air supply main pipe is arranged above the economizer and is located in the gap reserved between the evaporator and the condenser. The three air supply branches are respectively connected to the air supply ports of the three groups of compressors. A third solenoid valve is installed on the air supply branch pipe.

[0023] Furthermore, one end of the motor cooling liquid inlet pipeline is led out from the bottom end of the condenser, surrounds the condenser, passes through the gap formed between the condenser and the inverter control cabinet, and is connected to the motor cooling liquid inlet of the compressor;

[0024] The motor cooling air return pipeline is located above the evaporator, one end of the motor cooling air return pipeline is connected to the motor cooling air return port of the compressor, and the other end is connected to the motor cooling air return port of the evaporator.

[0025] Furthermore, the motor cooling liquid inlet pipeline is provided with a fourth angle valve, a fifth angle valve, a second drying filter, a fourth solenoid valve, a second sight glass, and a second electronic expansion valve;

[0026] A sixth angle valve is provided on the motor cooling air return pipeline.

[0027] Furthermore, the compressor is an air-suspended centrifugal compressor.

[0028] Compared with the prior art, the three-machine system air suspension variable frequency centrifugal chiller described in the present invention has the following beneficial effects:

[0029] The utility model describes a three-machine system air-suspended variable-frequency centrifugal chiller. The structural layout of each part of the whole unit is reasonable, and can achieve the technical effects of low energy consumption, high refrigeration efficiency, more energy saving and environmental protection, compact unit structure, higher integration, small footprint, low noise of the whole machine, simple control of each part of the unit, easy to use, low maintenance cost, and more stable operation of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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:

[0031] Figure 1 This is a schematic structural diagram of a three-machine system air suspension variable frequency centrifugal chiller from a first angle according to an embodiment of the present utility model;

[0032] Figure 2 This is a second-angle structural diagram of a three-machine system air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0033] Figure 3 This is a schematic structural diagram from a third angle of a three-machine system air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0034] Figure 4 This is a top view of a three-machine system air suspension variable frequency centrifugal chiller according to an embodiment of the present utility model;

[0035] Figure 5 This is a piping connection diagram of a three-machine system air-suspended variable-frequency centrifugal chiller system described in an embodiment of the present utility model.

[0036] Description of reference numerals:

[0037] 1. Evaporator; 2. Condenser; 3. Economizer; 4. Compressor; 5. Inverter control cabinet; 6. Support frame; 601. Tube sheet; 602. Footing; 7. First-stage throttling pipeline; 701. First stop valve; 702. First throttling steel pipe; 703. Drying filter cartridge; 704. Second throttling steel pipe; 705. First reducer; 706. Third throttling steel pipe; 707. First electric ball valve; 708. Fourth throttling steel pipe Pipe; 709, second reducer; 710, first elbow; 711, fifth throttling steel pipe; 712, second stop valve; 8, secondary throttling pipeline; 801, third stop valve; 802, sixth throttling steel pipe; 803, third reducer; 804, seventh throttling steel pipe; 805, second electric ball valve; 806, eighth throttling steel pipe; 807, fourth reducer; 808, second elbow; 809, ninth throttling steel pipe 8010, fourth stop valve; 9, mounting bracket; 10, suction line; 1001, suction pipe; 1002, fifth reducer; 1003, third elbow; 1004, first flange; 1005, first butterfly valve; 11, exhaust line; 1101, sixth reducer; 1102, first exhaust pipe; 1103, fourth elbow; 1104, second exhaust pipe; 1105, second flange; 1106, check valve Valve; 1107, third flange; 1108, third exhaust pipe; 1109, fourth flange; 1110, second butterfly valve; 12, shutdown pipeline; 13, inverter cooling liquid inlet pipeline; 14, inverter cooling return air pipeline; 15, air supply pipeline; 1501, air supply main pipe; 1502, air supply branch pipe; 16, motor cooling liquid inlet pipeline; 17, motor cooling return air pipeline; 18, hot gas bypass pipeline; 19, weak current control cabinet. DETAILED DESCRIPTION

[0038] 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.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] See also Figures 1 to 5 As shown, this embodiment provides a three-machine system air suspension variable frequency centrifugal chiller, including an evaporator 1, a condenser 2, an economizer 3, a compressor 4 and a frequency converter;

[0041] The evaporator 1 and the condenser 2 are arranged side by side on a support frame 6, and the economizer 3 is arranged below the condenser 2. One end of the economizer 3 is connected to the condenser 2 through a primary throttling pipe 7, and the other end is connected to the evaporator 1 through a secondary throttling pipe 8, wherein the primary throttling pipe 7 and the secondary throttling pipe 8 are arranged below the economizer 3.

[0042] There are three compressors 4 and three frequency converters. The three compressors 4 are arranged above the condenser 2 at intervals. Each compressor 4 is connected to the evaporator 1 through an air suction line 10 and a motor cooling return air line 17, and is connected to the condenser 2 through an air discharge line 11 and a motor cooling liquid inlet line 16.

[0043] The frequency converter is installed in the frequency converter control cabinet 5. Three frequency converter control cabinets 5 (frequency converter control cabinet 5 is as follows Figure 5 As shown, other components used in conjunction with the frequency converter are common knowledge in the art, and can achieve the normal operation of the frequency converter, so they will not be described in detail here) are all installed on the side wall of the condenser 2 through a fixed bracket (the fixed bracket is not shown in the accompanying drawings. In addition, the present application also installs a weak current control cabinet 19 on the side wall of the condenser 2. A weak current controller is installed in the weak current control cabinet 19 to control each device. The weak current controller is a conventional setting in the art and will not be further described here). It is installed on the side wall of the condenser 2 and arranged corresponding to the three compressors 4. One end of each frequency converter is connected to the evaporator 1 through the frequency converter cooling return air pipeline 14, and the other end is connected to the condenser 2 through the frequency converter cooling liquid inlet pipeline 13;

[0044] The economizer is connected to the three compressors respectively through three groups of air supply pipelines, and a hot air bypass pipeline is also connected between the evaporator and the condenser.

[0045] Specifically, in this embodiment, the complete unit described in the present application adopts three compressors 4 and three inverters, and the pipeline design is carried out around an evaporator 1, a condenser 2, an economizer 3, three compressors 4 and three inverters. The liquid refrigerant in the evaporator 1 absorbs heat and vaporizes to become refrigerant vapor, which passes through three sets of suction pipes 10 and is then sucked in by the three compressors 4 respectively. The refrigerant is compressed into high-temperature and high-pressure refrigerant vapor, and then flows into the condenser 2 through three sets of exhaust pipes 11. At this time, the refrigerant is condensed into medium-temperature and high-pressure refrigerant liquid. Primary and secondary throttling pipes 8 are arranged before and after the economizer 3. After condensation by the condenser 2, the refrigerant forms a medium-temperature and high-pressure refrigerant liquid. After the primary throttling, the refrigerant liquid forms a medium-temperature and medium-pressure liquid. After the secondary throttling, it forms a low-temperature and low-pressure liquid and enters the evaporator 1 to complete the refrigeration cycle.

[0046] At the same time, three sets of motor cooling return air pipelines 17 and three sets of motor cooling liquid inlet pipelines 16 are set, which can complete the liquid spray cooling of the motors of the three compressors 4 and realize the cooling process of the motors of the three compressors 4 respectively.

[0047] Three inverters are installed on the side wall of the condenser 2, and three sets of inverter cooling return air pipes 14 and three sets of inverter cooling liquid inlet pipes 13 are introduced. The refrigerant liquid can completely absorb heat and gasify into refrigerant vapor in the inverter, thereby realizing the cooling process of the three inverters.

[0048] In addition, the compressor 4 used in this application is an air-suspended centrifugal compressor 4. By utilizing the characteristics of the air-suspended centrifugal compressor 4 itself and rationally arranging the various parts of the entire unit, it can achieve the technical effects of low energy consumption, high refrigeration efficiency, more energy saving and environmental protection, compact unit structure, higher integration, small footprint, low noise of the whole machine, simple control of each component of the unit, easy to use, low maintenance cost, and more stable operation of the whole machine.

[0049] In some embodiments, as Figure 2 As shown, the support frame 6 includes tube sheets 601 arranged in parallel on both sides, and a base 602 is provided at the bottom of the tube sheet 601;

[0050] Both ends of the evaporator 1 and the condenser 2 are fixedly connected to the tube sheets 601 on both sides through flanges, and the economizer 3 is arranged below the condenser 2 through a connecting bracket.

[0051] Specifically, in this embodiment, the designed support frame 6 is composed of tube sheets 601 arranged in parallel on both sides, the evaporator 1 and the condenser 2 are installed between the two tube sheets 601, and the base 602 is installed at the bottom of the tube sheet 601 to achieve fixed installation of the whole machine; the economizer 3 is arranged below the condenser 2 and is fixedly connected to the condenser 2 through a connecting bracket. Since the layout of the various equipment structures in the existing units is unreasonable, resulting in a large occupied area and the layout and assembly are complicated and cumbersome, resulting in high workload for operators. However, this application reasonably arranges the structures of various equipment on the basis of meeting lower energy consumption and better cooling effect, and the structure of the whole unit is compact and occupies less space.

[0052] In some embodiments, as Figure 1 、 Figure 2 and Figure 5 As shown, the primary throttling pipeline 7 is composed of a first stop valve 701, a first throttling steel pipe 702, a drying filter cartridge 703, a second throttling steel pipe 704, a first reducer 705, a third throttling steel pipe 706, a first electric ball valve 707, a fourth throttling steel pipe 708, a second reducer 709, a first elbow 710, a fifth throttling steel pipe 711, and a second stop valve 712. The first stop valve 701 is provided at the liquid outlet of the condenser 2, the second stop valve 712 is provided at the liquid inlet of the economizer 3, and the third throttling steel pipe 706 and the fourth throttling steel pipe 708 are fixedly connected to the flange provided on the first electric ball valve 707 through the flanges provided thereon.

[0053] The secondary throttling pipeline 8 is composed of a third stop valve 801, a sixth throttling steel pipe 802, a third reducer 803, a seventh throttling steel pipe 804, a second electric ball valve 805, an eighth throttling steel pipe 806, a fourth reducer 807, a second elbow 808, a ninth throttling steel pipe 809, and a fourth stop valve 8010. The third stop valve 801 is arranged at the liquid inlet of the evaporator 1, the fourth stop valve 808 is arranged at the liquid outlet of the economizer 3, and the seventh throttling steel pipe 804 and the eighth throttling steel pipe 806 are fixedly connected to the flanges arranged on the second electric ball valve 805 through the flanges arranged thereon.

[0054] Specifically, in this embodiment, the primary throttling pipeline 7 and the secondary throttling pipeline 8 are arranged in an L-shaped structure. The primary throttling pipeline 7 is arranged below the condenser 2 and the economizer 3. The liquid outlet of the condenser 2 is connected to the liquid inlet of the economizer 3 through the primary throttling pipeline 7. The primary throttling pipeline 7 includes a steel pipe, a steel elbow, a reducer, an electric ball valve, a drying barrel, a stop valve, and a temperature sensing clamp. The secondary throttling pipeline 8 is arranged below the evaporator 1 and the economizer 3. The liquid outlet of the economizer 3 is connected to the liquid inlet of the evaporator 1 through the secondary throttling pipeline 8. The secondary throttling pipeline 8 includes a steel pipe, a steel elbow, a reducer, an electric ball valve, a stop valve, and a temperature sensing clamp.

[0055] In some embodiments, the compressor 4 is mounted on the top of the cylinder of the condenser 2 via a mounting bracket 9 connected at the bottom;

[0056] like Figure 3 and Figure 5 As shown, the suction line 10 is composed of a suction pipe 1001, a fifth reducer 1002, a third elbow 1003, a first flange 1004 and a first butterfly valve 1005. The suction pipe 1001 is provided at the air inlet of the compressor 4, the first flange 1004 is connected to the air outlet of the evaporator 1, and the first butterfly valve 1005 is provided at the air outlet.

[0057] The exhaust pipeline 11 is composed of a sixth reducer 1101, a first exhaust pipe 1102, a fourth elbow 1103, a second exhaust pipe 1104, a second flange 1105, a check valve 1106, a third flange 1107, a third exhaust pipe 1108, a fourth flange 1109, and a second butterfly valve 1110. The sixth reducer 1101 is connected to the air outlet of the compressor 4, the fourth flange 1109 is connected to the air inlet of the condenser 2, and the second butterfly valve 1110 is provided at the air inlet.

[0058] like Figure 3 and Figure 5 As shown, three groups of shutdown pipelines 12 are also included. One end of each group of shutdown pipelines 12 is connected to the intake pipe 1001, and the other end is connected to the first exhaust pipe 1102. A first solenoid valve is provided on the shutdown pipeline 12.

[0059] Specifically, in this embodiment, a mounting bracket 9 is fixed to the top of the cylinder of the condenser 2, and the compressor 4 is fixed to the mounting bracket 9 by fastening bolts. The three compressors 4 are arranged side by side. At the same time, the suction pipe 10 and the exhaust pipe 11 are arranged vertically, and the shutdown pipe 12 connects the suction pipe 10 and the exhaust pipe 11. The air inlet of the compressor 4 is connected to the air outlet of the evaporator 1 through the suction pipe 10, and the air outlet of the compressor 4 is connected to the air inlet of the condenser 2 through the exhaust pipe 11. The air outlet of the exhaust pipe 11 is connected to the air inlet of the suction pipe 10 through the shutdown pipe 12. The suction pipe 10 includes a steel pipe, a steel elbow, a reducer, a round flange, and a manual butterfly valve. The exhaust pipe 11 includes a steel pipe, a steel pipe head, a reducer, a round flange, a manual butterfly valve and a one-way valve.

[0060] In some embodiments, as Figures 1 to 5 As shown, the inverter cooling liquid inlet pipeline is arranged in the gap reserved between the inverter control cabinet and the condenser, and the inverter cooling liquid inlet pipeline is provided with a second solenoid valve, a first electronic expansion valve, a first sight glass, a first drying filter, a first angle valve and a second angle valve;

[0061] The inverter cooling return air pipeline is arranged above the evaporator and condenser, and a third angle valve is provided on the inverter cooling return air pipeline.

[0062] Specifically, in this embodiment, the inverter cooling liquid inlet pipeline 13 and the inverter cooling air return pipeline 14 are arranged based on the installed inverter and condenser 2. The inverter cooling liquid inlet is connected to the inverter cooling liquid outlet of the condenser 2 through the inverter cooling liquid inlet pipeline 13, and the inverter cooling air outlet is connected to the inverter cooling air return pipeline 14 of the evaporator 1. The cooling process of the inverter is completed based on the designed inverter cooling liquid inlet pipeline 13 and inverter cooling return air pipeline 14.

[0063] Among them, the inverter cooling liquid inlet pipeline 13 includes a copper tube, an electronic expansion valve, a copper reducer, a solenoid valve, a sight glass, a drying filter, and an angle valve, and the inverter cooling air return pipeline 14 includes a copper tube and an angle valve.

[0064] In some embodiments, as Figure 3 and Figure 5 As shown, the air supply pipeline 15 includes an air supply main pipe 1501 and three air supply branch pipes 1502 connected to the air supply main pipe 1501. The air supply main pipe 1501 is connected to the air supply outlet of the economizer 3 via a flange. A third butterfly valve is also installed at the air supply outlet of the economizer 3. The air supply main pipe 1501 is arranged above the economizer 3 and located in the gap reserved between the evaporator 1 and the condenser 2. The three air supply branch pipes 1502 are respectively connected to the air supply ports of the three groups of compressors 4. The air supply branch pipes 1502 are equipped with a third solenoid valve.

[0065] like Figures 2 to 5 As shown, a hot gas bypass line 18 is further provided between the condenser 2 and the evaporator 1 .

[0066] Specifically, in this embodiment, the air supply port of the compressor 4 is connected to the air supply outlet of the economizer 3 through the air supply pipeline 15. The air supply pipeline 15 mainly plays the role of supplying air and increasing enthalpy. This application sets the air supply pipeline 15 as an air supply main pipe 1501. The air supply main pipe 1501 is located in the gap reserved between the evaporator 1 and the condenser 2. At the same time, three air supply branch pipes 1502 are led out from the air supply main pipe 1501 and are respectively connected to the air supply ports of the three compressors 4, and the air supply flow rate of the pipeline is controlled by the solenoid valve.

[0067] The hot gas bypass port of the evaporator 1 is connected to the hot gas bypass port of the condenser 2 through a hot gas bypass pipe 18. An electric butterfly valve is provided on the hot gas bypass pipe 18. By arranging the hot gas bypass pipe 18 between the condenser 2 and the evaporator 1, the high-temperature gaseous refrigerant at the high-pressure end can be bypassed to the low-pressure end of the system, thereby ensuring that the system always operates at a given minimum return air pressure.

[0068] In some embodiments, as Figure 1 and Figure 4 As shown, one end of the motor cooling liquid inlet pipe 16 is led out from the bottom end of the condenser 2, surrounds the condenser 2, passes through the gap formed between the condenser 2 and the inverter control cabinet, and is connected to the motor cooling liquid inlet of the compressor 4;

[0069] The motor cooling air return pipe 17 is located above the evaporator 1. One end of the motor cooling air return pipe 17 is connected to the motor cooling air return port of the compressor 4, and the other end is connected to the motor cooling air return port of the evaporator 1.

[0070] like Figure 5 As shown, the motor cooling liquid inlet pipeline 16 is provided with a fourth angle valve, a fifth angle valve, a second drying filter, a fourth solenoid valve, a second sight glass, and a second electronic expansion valve;

[0071] A sixth angle valve is provided on the motor cooling air return line 17 .

[0072] Specifically, in this embodiment, the motor cooling liquid inlet of the compressor 4 is connected to the motor cooling liquid outlet of the condenser 2 through the motor cooling liquid inlet pipeline 16, and the motor cooling air return port of the compressor 4 is connected to the motor cooling air return port of the evaporator 1 through the motor cooling air return pipeline 17.

[0073] The motor cooling liquid inlet pipeline 16 includes a copper tube, an electronic expansion valve, an angle valve, a sight glass, a drying filter, and a copper reducer. The motor cooling air return pipeline 17 includes a copper tube and an angle valve.

[0074] This application sets three sets of motor cooling return air pipes 17 and three sets of motor cooling liquid inlet pipes 16 to complete the liquid spray cooling of the motors of the three compressors 4, thereby realizing the cooling process of the motors of the three compressors 4 separately. Compared with the single-machine system and the dual-machine system, it has higher cooling efficiency and lower energy consumption, and can meet the user's higher production needs.

[0075] 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.

[0076] 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 three-machine system air suspension variable frequency centrifugal chiller, characterized by: Including evaporator, condenser, economizer, compressor and inverter; The evaporator and the condenser are arranged side by side on a supporting frame, the economizer is arranged below the condenser, one end of the economizer is connected to the condenser through a primary throttling pipeline, and the other end is connected to the evaporator through a secondary throttling pipeline, wherein the primary throttling pipeline and the secondary throttling pipeline are arranged below the economizer; The number of the compressor and the frequency converter is three, and the three compressors are arranged above the condenser at intervals. Each compressor is connected to the evaporator through an air suction line and a motor cooling return line, and is connected to the condenser through an air discharge line and a motor cooling liquid inlet line. The inverter is installed in the inverter control cabinet. The three inverter control cabinets are mounted on the side wall of the condenser through fixed brackets and arranged corresponding to the three compressors. One end of each inverter is connected to the evaporator through the inverter cooling return air pipeline, and the other end is connected to the condenser through the inverter cooling liquid inlet pipeline. The economizer is connected to the three compressors respectively through three groups of air supply pipelines, and a hot air bypass pipeline is also connected between the evaporator and the condenser.

2. The three-machine system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The support frame includes tube sheets arranged in parallel on both sides, and the bottom of the tube sheets is provided with feet; The two ends of the evaporator and the condenser are fixedly connected to the tube sheets on both sides through flanges respectively, and the economizer is arranged below the condenser through a connecting bracket.

3. The three-machine system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The primary throttling pipeline is composed of a first stop valve, a first throttling steel pipe, a drying filter cartridge, a second throttling steel pipe, a first reducer, a third throttling steel pipe, a first electric ball valve, a fourth throttling steel pipe, a second reducer, a first elbow, a fifth throttling steel pipe, and a second stop valve, wherein the first stop valve is arranged at the liquid outlet of the condenser, the second stop valve is arranged at the liquid inlet of the economizer, and the third throttling steel pipe and the fourth throttling steel pipe are connected to the flange of the first electric ball valve through the flanges arranged thereon; The secondary throttling pipeline is composed of a third stop valve, a sixth throttling steel pipe, a third reducer, a seventh throttling steel pipe, a second electric ball valve, an eighth throttling steel pipe, a fourth reducer, a second elbow, a ninth throttling steel pipe, and a fourth stop valve, wherein the third stop valve is arranged at the liquid inlet of the evaporator, the fourth stop valve is arranged at the liquid outlet of the economizer, and the seventh throttling steel pipe and the eighth throttling steel pipe are respectively connected to the flange arranged on the second electric ball valve through the flanges arranged thereon.

4. The three-machine system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The compressor is arranged on the top of the cylinder of the condenser through a mounting bracket connected at the bottom; The suction pipe is composed of a suction pipe, a fifth reducer, a third elbow, a first flange and a first butterfly valve, the suction pipe is arranged at the air inlet of the compressor, the first flange is connected to the air outlet of the evaporator, and the first butterfly valve is arranged at the air outlet; The exhaust pipeline is composed of a sixth reducer, a first exhaust pipe, a fourth elbow, a second exhaust pipe, a second flange, a check valve, a third flange, a third exhaust pipe, a fourth flange, and a second butterfly valve. The sixth reducer is connected to the air outlet of the compressor, the fourth flange is connected to the air inlet of the condenser, and the second butterfly valve is arranged at the air inlet.

5. The three-machine system air suspension variable frequency centrifugal chiller according to claim 4, characterized in that: It also includes three groups of shutdown pipelines, one end of each group of shutdown pipelines is connected to the intake pipe, and the other end is connected to the first exhaust pipe, and a first solenoid valve is provided on the shutdown pipeline.

6. The three-machine system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The inverter cooling liquid inlet pipeline is arranged in a gap reserved between the inverter control cabinet and the condenser, and is provided with a second solenoid valve, a first electronic expansion valve, a first sight glass, a first drying filter, a first angle valve and a second angle valve; The inverter cooling return air pipeline is arranged above the evaporator and the condenser, and a third angle valve is provided on the inverter cooling return air pipeline.

7. The three-machine system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The air supply pipeline includes an air supply main pipe and three air supply branches connected to the air supply main pipe. The air supply main pipe is connected to the air supply outlet of the economizer through a flange. A third butterfly valve is also installed at the air supply outlet of the economizer. The air supply main pipe is arranged above the economizer and located in the gap reserved between the evaporator and the condenser. The three air supply branches are respectively connected to the air supply ports of the three groups of compressors. A third solenoid valve is installed on the air supply branch pipe.

8. The three-machine system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: One end of the motor cooling liquid inlet pipeline is led out from the bottom end of the condenser, surrounds the condenser, passes through the gap formed between the condenser and the inverter control cabinet, and is connected to the motor cooling liquid inlet of the compressor; The motor cooling air return pipeline is located above the evaporator, one end of the motor cooling air return pipeline is connected to the motor cooling air return port of the compressor, and the other end is connected to the motor cooling air return port of the evaporator.

9. The three-machine system air suspension variable frequency centrifugal chiller according to claim 8, characterized in that: The motor cooling liquid inlet pipeline is provided with a fourth angle valve, a fifth angle valve, a second drying filter, a fourth solenoid valve, a second sight glass, and a second electronic expansion valve; A sixth angle valve is provided on the motor cooling air return pipeline.

10. The three-machine system air suspension variable frequency centrifugal chiller according to claim 1, characterized in that: The compressor is an air-suspended centrifugal compressor.

Images