Cooling device and magnetic suspension centrifugal compressor

Abstract

The utility model discloses a cooling device and a magnetic suspension centrifugal compressor. The cooling device is arranged on a shell of the magnetic suspension centrifugal compressor, and the shell is provided with a first through hole and a second through hole. The cooling device comprises an inlet; the inlet is communicated with the first through hole, and a refrigerant flows into the shell through the inlet and the first through hole; the cooling device further comprises an electromagnetic valve, the inlet, the electromagnetic valve and the second through hole are communicated in sequence, and a refrigerant flows into the shell after passing through the inlet, the electromagnetic valve and the second through hole. According to the magnetic suspension centrifugal compressor, the cooling device is arranged on the shell, and a refrigerant is connected through the inlet, so that the refrigerant enters the shell through the first through hole, and cooling of the magnetic suspension centrifugal compressor can be achieved. In addition, a refrigerant can enter the shell through the electromagnetic valve and the second through hole, different working conditions can be better met, the cooling amount can be conveniently increased, insufficient cooling is avoided, excessive temperature fluctuation is avoided, and waste of loads can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration, and in particular to a cooling device and a magnetic levitation centrifugal compressor. Background Technology

[0002] Magnetic levitation centrifugal compressors are a type of highly efficient and energy-saving compressor. They utilize magnetic levitation bearings and permanent magnet variable frequency motors, reducing frictional losses associated with traditional mechanical bearings and improving compressor speed and efficiency. Therefore, magnetic levitation compressors exhibit high full-load efficiency and excellent part-load efficiency.

[0003] Currently, existing centrifugal refrigeration compressors typically use refrigerant to directly cool the magnetic levitation bearings and motors. The compressor cooling solution involves introducing high-pressure liquid refrigerant from the condenser or economizer. This liquid refrigerant then enters the cooling lines of the motor and bearings for cooling, and subsequently returns to the evaporator through different loops. In this solution, the coolant flow rate is controlled by the OEM using a constant orifice, generally resulting in a constant cooling flow rate in centrifugal refrigeration compressor units. However, the compressor temperature varies under different operating conditions, and the cooling capacity cannot be increased or decreased. This leads to excessive or insufficient cooling, causing significant temperature fluctuations and wasted overhead. Furthermore, this solution involves numerous and complex cooling lines, requiring specialized technical personnel to train and design the system for the client, resulting in high costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of large temperature fluctuations in the compressor of the existing centrifugal refrigeration compressor unit, and to provide a cooling device and a magnetic levitation centrifugal compressor.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A cooling device is disposed in the housing of a magnetically levitated centrifugal compressor. The housing has a first through hole and a second through hole. The cooling device includes an inlet through which refrigerant flows into the cooling device. The inlet is connected to the first through hole, through which the refrigerant flows into the interior of the housing. The cooling device also includes a solenoid valve, in which the inlet, the solenoid valve, and the second through hole are sequentially connected. The refrigerant flows into the interior of the housing after passing through the inlet, the solenoid valve, and the second through hole. The solenoid valve is used to control whether the refrigerant can flow into the interior of the housing through the second through hole.

[0007] In this design, by adopting the above structure and placing the cooling device on the casing, the refrigerant is introduced through an inlet and enters the casing through the first through-hole, thus achieving cooling of the magnetic levitation centrifugal compressor. The refrigerant can also enter the casing through a solenoid valve and a second through-hole, better adapting to different operating conditions, easily increasing cooling capacity, avoiding insufficient cooling, preventing excessive temperature fluctuations, and avoiding wasted load. Furthermore, using only one inlet simplifies the cooling piping, reduces assembly difficulty, and improves design and installation efficiency.

[0008] Optionally, when the temperature inside the magnetic levitation centrifugal compressor is higher than a preset value, the solenoid valve opens, and the refrigerant flows into the interior of the housing through the solenoid valve and the second through hole;

[0009] When the internal temperature of the magnetic levitation centrifugal compressor is lower than a preset value, the solenoid valve closes.

[0010] Optionally, the cooling device further includes a first regulating valve, which is located between the inlet and the first through hole.

[0011] Optionally, the cooling device further includes a second regulating valve, which is disposed between the solenoid valve and the second through hole.

[0012] Optionally, the cooling device further includes a temperature sensor and a controller, wherein the temperature sensor is used to detect the temperature signal of the magnetic levitation centrifugal compressor and send the temperature signal to the controller;

[0013] The controller is used to receive the temperature signal and to compare the temperature signal with a preset value. When the temperature signal is higher than the preset value, the controller controls the solenoid valve to open; when the temperature signal is lower than the preset value, the controller controls the solenoid valve to close.

[0014] A magnetic levitation centrifugal compressor includes a cooling device as described above, the cooling device being disposed on the housing of the magnetic levitation centrifugal compressor.

[0015] In this solution, by adopting the above structure and setting a cooling device on the casing of the magnetic levitation centrifugal compressor, it is possible to better cope with different working conditions, conveniently increase the cooling capacity, avoid insufficient cooling, avoid excessive temperature fluctuations, and also avoid wasting load.

[0016] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0017] The positive and progressive effects of this utility model are as follows:

[0018] This invention cools the magnetic levitation centrifugal compressor by installing a cooling device on the casing and using an inlet to connect the refrigerant, which then enters the casing through a first through-hole. The refrigerant can also enter the casing through a solenoid valve and a second through-hole, allowing for better handling of different operating conditions, conveniently increasing cooling capacity, preventing insufficient cooling, avoiding excessive temperature fluctuations, and preventing wasted load. Furthermore, using only one inlet simplifies the cooling piping, reduces assembly difficulty, and improves design and installation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the housing of the magnetic levitation centrifugal compressor according to an embodiment of the present invention.

[0020] Figure 2 for Figure 1 A schematic diagram of the cooling device in a magnetic levitation centrifugal compressor.

[0021] Figure 3 for Figure 1 A schematic diagram of the cross-section of a magnetic levitation centrifugal compressor.

[0022] Explanation of reference numerals in the attached figures:

[0023] Magnetic levitation centrifugal compressor 100

[0024] Casing 11

[0025] First through hole 12

[0026] Second through hole 13

[0027] Cooling device 20

[0028] Imported 21

[0029] Solenoid valve 22

[0030] First regulating valve 23

[0031] Second regulating valve 24

[0032] Cover plate 25

[0033] Adapter Block 26 Detailed Implementation

[0034] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0035] like Figures 1-3As shown, this embodiment includes a cooling device 20 and a magnetic levitation centrifugal compressor 100. The magnetic levitation centrifugal compressor includes the cooling device 20, which is disposed on the housing 11 of the magnetic levitation centrifugal compressor 100. By providing the cooling device 20 on the housing 11 of the magnetic levitation centrifugal compressor 100, different operating conditions can be better handled, the cooling capacity can be easily increased, insufficient cooling can be avoided, excessive temperature fluctuations can be avoided, and waste of load can be avoided.

[0036] Combination Figure 2 and Figure 3 A cooling device 20 is installed on the housing 11 of the magnetic levitation centrifugal compressor 100. The housing 11 has a first through hole 12 and a second through hole 13. The cooling device 20 includes an inlet 21 through which refrigerant flows into the cooling device 20. The inlet 21 is connected to the first through hole 12, and the refrigerant flows into the interior of the housing 11 through the inlet 21 and the first through hole 12. The cooling device 20 also includes a solenoid valve 22, which is sequentially connected to the inlet 21, the solenoid valve 22, and the second through hole 13. The refrigerant flows into the interior of the housing 11 after passing through the inlet 21, the solenoid valve 22, and the second through hole 13. The solenoid valve 22 is used to control whether the refrigerant can flow into the interior of the housing 11 through the second through hole 13. By installing the cooling device 20 on the housing 11 and using the inlet 21 to connect the refrigerant, which then enters the interior of the housing 11 through the first through hole 12, cooling of the magnetic levitation centrifugal compressor 100 can be achieved. The refrigerant can also enter the interior of the housing 11 through the solenoid valve 22 and the second through-hole 13, which can better cope with different operating conditions, easily increase the cooling capacity, avoid insufficient cooling, avoid excessive temperature fluctuations, and avoid wasted load. At the same time, setting only one inlet 21 can simplify the cooling pipeline, reduce assembly difficulty, and improve design and installation efficiency.

[0037] When the internal temperature of the magnetic levitation centrifugal compressor 100 is higher than the preset value, the solenoid valve 22 opens, and the refrigerant flows into the interior of the housing 11 through the solenoid valve 22 and the second through hole 13; when the internal temperature of the magnetic levitation centrifugal compressor 100 is lower than the preset value, the solenoid valve 22 closes. As one implementation method, the preset value can be set according to the actual operating conditions of the magnetic levitation centrifugal compressor 100. The operating temperature range of the magnetic levitation centrifugal compressor 100 is typically 120℃ to 150℃ under standard operating conditions, and the preset value can be set accordingly.

[0038] The cooling device 20 also includes a first regulating valve 23, which is located between the inlet 21 and the first through hole 12. The cooling device 20 also includes a second regulating valve 24, which is located between the solenoid valve 22 and the second through hole 13. The first regulating valve 23 and the second regulating valve 24 can be understood as including conventional valve bodies, capable of controlling the opening or closing of the flow channel.

[0039] The cooling device 20 also includes a temperature sensor and a controller. The temperature sensor detects the temperature signal of the magnetic levitation centrifugal compressor 100 and sends the temperature signal to the controller. The controller receives the temperature signal and compares it with a preset value. When the temperature signal is higher than the preset value, the controller controls the solenoid valve 22 to open; when the temperature signal is lower than the preset value, the controller controls the solenoid valve 22 to close. The temperature sensor can include a conventional temperature sensor. The controller can include a PLC microcontroller, a computer, etc. The temperature sensor and controller can be integrated into the solenoid valve 22.

[0040] To achieve cooling of the motor and bearings of the magnetic levitation centrifugal compressor 100, a first through hole 12 and a second through hole 13 can be provided on the housing 11 of the magnetic levitation centrifugal compressor 100, and a first regulating valve 23 and a solenoid valve 22 can be provided accordingly to form a built-in coolant intake structure, control the amount of coolant entering, and add a temperature signal function to control the opening or closing of the solenoid valve 22, which can increase or decrease the coolant flow rate, so as to maintain the motor and bearings at the optimal temperature.

[0041] By setting only a single cooling inlet, the need for additional cooling piping when using the magnetic levitation centrifugal compressor 100 can be reduced, making it convenient and simple, and requiring no additional specialized training for technical personnel. The cooling flow rate can be designed at the factory through control logic, enabling precise control of the cooling flow rate and reducing the power consumption and insufficient cooling of the magnetic levitation centrifugal compressor 100.

[0042] The built-in cooling intake structure of the magnetic levitation centrifugal compressor 100 includes a first through-hole 12 and a second through-hole 13 respectively located in two passages within the housing 11. A dedicated refrigerant inlet 21 is used. After entering, the refrigerant flows to both sides. One path is controlled by a first regulating valve 23 to enter the cavity for cooling; the other path enters a solenoid valve 22 on standby. When a temperature rise signal is received, the solenoid valve 22 opens, allowing the refrigerant to flow through to the second through-hole 13. After passing through the second regulating valve 24 into the cavity, the cooling flow is increased. When the temperature drops to a certain level, the solenoid valve 22 immediately closes, reducing the cooling flow and preventing further temperature decrease. This method ensures that the temperature of the magnetic levitation bearing and motor remains within the optimal operating temperature range.

[0043] Combination Figure 2 and Figure 3 Coolant enters the housing 11 through the first through-hole 12 from the inlet. During normal operation, the solenoid valve 22 is normally closed, and the coolant enters the cavity for cooling through the first through-hole 12 and the regulating valve. Figure 2 The figure also shows a cover plate 25 and a transition block 26. The first regulating valve 23 and the second regulating valve 24 are both located on the cover plate 25. The solenoid valve 22 is located on the transition block 26.

[0044] When the temperature rises above the set temperature, the controller opens the solenoid valve 22, allowing coolant to flow through the first through-hole 12. Simultaneously, the coolant also flows through the solenoid valve 22 into the second through-hole 13, where it is controlled by the second regulating valve 24 to enter the cavity for cooling. When the temperature drops below the set temperature, the solenoid valve 22 closes, and the coolant flows through the inlet only into the first through-hole 12, where it is controlled by the first regulating valve 23 to enter the motor for cooling.

[0045] The built-in solenoid valve 22 effectively controls the cooling flow, reducing power consumption. Simultaneously, the motor control temperature is pre-set at the factory, providing excellent motor protection. The entire magnetic levitation centrifugal compressor 100 has only one cooling inlet, making it convenient for customers and easy to install.

[0046] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A cooling device, characterized in that, The cooling device is located in the housing of the magnetic levitation centrifugal compressor, and the housing has a first through hole and a second through hole; the cooling device includes an inlet, through which refrigerant flows into the cooling device; the inlet is connected to the first through hole, and the refrigerant flows into the interior of the housing through the inlet and the first through hole; The cooling device also includes a solenoid valve. The inlet, the solenoid valve, and the second through hole are connected in sequence. The refrigerant flows into the interior of the housing after passing through the inlet, the solenoid valve, and the second through hole. The solenoid valve is used to control whether the refrigerant can flow into the interior of the housing through the second through hole.

2. The cooling device as described in claim 1, characterized in that, When the internal temperature of the magnetic levitation centrifugal compressor is higher than a preset value, the solenoid valve opens, and the refrigerant flows into the interior of the housing through the solenoid valve and the second through hole; When the internal temperature of the magnetic levitation centrifugal compressor is lower than a preset value, the solenoid valve closes.

3. The cooling device as described in claim 1, characterized in that, The cooling device further includes a first regulating valve, which is located between the inlet and the first through hole.

4. The cooling device as described in claim 1, characterized in that, The cooling device further includes a second regulating valve, which is located between the solenoid valve and the second through hole.

5. The cooling device as described in claim 1, characterized in that, The cooling device also includes a temperature sensor and a controller. The temperature sensor is used to detect the temperature signal of the magnetic levitation centrifugal compressor and send the temperature signal to the controller. The controller is used to receive the temperature signal and to compare the temperature signal with a preset value. When the temperature signal is higher than the preset value, the controller controls the solenoid valve to open; when the temperature signal is lower than the preset value, the controller controls the solenoid valve to close.

6. A magnetically levitated centrifugal compressor, characterized in that, The magnetic levitation centrifugal compressor includes a cooling device as described in any one of claims 1-5, the cooling device being disposed on the housing of the magnetic levitation centrifugal compressor.

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