Magnetic suspension centrifugal water chilling unit

Abstract

The invention discloses a magnetic suspension centrifugal water chilling unit, and relates to the field of refrigeration equipment, the magnetic suspension centrifugal water chilling unit comprises a first pipeline and a second pipeline which are used for conveying a refrigerant, the first pipeline and the second pipeline are respectively provided with an expansion mechanism, the first pipeline is communicated with the second pipeline, and the expansion mechanisms are arranged on the first pipeline and the second pipeline. A first valve and a second valve are arranged at the position where the first pipeline is communicated with the second pipeline. According to the magnetic suspension centrifugal water chilling unit, the first valve and the second valve are arranged at the communicating positions of the first pipeline and the second pipeline correspondingly, the linkage mechanism is arranged between the first valve and the second valve, and when one valve rotates, the linkage mechanism drives the other valve to rotate synchronously; therefore, the working states of the two pipelines can be conveniently adjusted at the same time, and the maintenance process can be simplified.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration equipment, and in particular to a magnetic suspension centrifugal chiller. Background Art

[0002] As is well known, magnetic levitation centrifugal chillers primarily consist of a compressor, condenser, evaporator, and throttling device. The compressor utilizes magnetic levitation technology, with the rotor suspended and rotating at high speed in a magnetic field. This compresses the low-temperature, low-pressure refrigerant into a high-temperature, high-pressure state. This refrigerant then dissipates heat through the condenser, transforming it into a high-pressure liquid. The throttling device then reduces the pressure to a low temperature and low pressure, absorbing the cooling load.

[0003] For example, the Chinese patent document with authorization announcement number CN222012386U, announcement date 2024-11-15, and titled "An Intelligent Switching Dual Oil Filter Group for Centrifugal Chillers" includes a controller, two filter assemblies, four electric valves, an oil filter inlet, an oil filter outlet, and a plurality of connecting pipes. The four electric valves are respectively connected to the two ends of the two filter assemblies through connecting pipes. The electric valves at the ends of the two filter assemblies are connected through connecting pipes. The oil filter inlet and the oil filter outlet are respectively connected to the connecting pipe between the two electric valves. The four electric valves are all connected to the controller and are controlled by the controller to open and close. By controlling the opening and closing of the electric valves at both ends of the two filter assemblies, one filter assembly is selected to work and the other filter assembly is kept on standby. When the filter element needs to be replaced, the standby filter assembly is switched to continue filtering before the filter element is replaced, thus solving the problem of needing to shut down the machine to replace the oil filter element.

[0004] The shortcoming of the existing technology is that in order to facilitate the inspection and replacement of vulnerable structures such as the expansion mechanism or the filtering mechanism, the above-mentioned components are usually set up in two groups. However, in the actual operation process, multiple valves need to be set up, and multiple valves need to be opened or closed in sequence to switch the opening and closing states of the two groups of mechanism channels. The process is relatively cumbersome. Summary of the Invention

[0005] The object of the present invention is to provide a magnetic suspension centrifugal chiller to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A magnetic levitation centrifugal chiller comprises a first pipe and a second pipe for conveying refrigerant, wherein the first pipe and the second pipe are each provided with an expansion mechanism, the first pipe is connected to the second pipe, and a first valve and a second valve are provided at the position where the first pipe and the second pipe communicate; A linkage mechanism is provided between the first valve and the second valve. When one valve rotates, the linkage mechanism drives the other valve to rotate synchronously.

[0007] In the above-mentioned magnetic levitation centrifugal chiller, the linkage mechanism includes a horizontal plate, a first connecting rod is rotatably provided on the horizontal plate, a first transmission rod is fixedly connected to the first valve, and the first connecting rod is rotatably connected to the first transmission rod.

[0008] In the above-mentioned magnetic levitation centrifugal chiller, a second connecting rod is rotatably provided on the horizontal plate, a second transmission rod is fixedly connected to the second valve, and the second connecting rod is rotatably connected to the second transmission rod.

[0009] The above-mentioned magnetic levitation centrifugal chiller also includes two temperature sensing components, and the two expansion mechanisms are respectively connected to the two temperature sensing components.

[0010] The above-mentioned magnetic levitation centrifugal chiller also includes a temperature sensing component, and the two expansion mechanisms share one temperature sensing component.

[0011] In the above-mentioned magnetic levitation centrifugal chiller, the expansion mechanism includes an expansion valve body, a sealing portion is slidably provided inside the expansion valve body, an adjusting knob is threadedly connected to the inside of the expansion valve body, a disc is rotatably provided on the adjusting knob, and an elastic member is provided between the disc and the sealing portion; The temperature sensing component includes a shell and a diaphragm arranged inside the shell. A driving rod is arranged on the diaphragm, and the blocking portion is connected to the driving rod.

[0012] In the above-mentioned magnetic levitation centrifugal chiller, drive grooves are respectively provided inside the two sealing parts, and the drive rod is slidingly connected to the two drive grooves at the same time; when the inner bottom wall of one of the drive grooves abuts against the bottom end of the drive rod, the inner bottom wall of the other drive groove is away from the bottom end of the drive rod.

[0013] The above-mentioned magnetic levitation centrifugal chiller further includes a switching component, and when one of the driving slots is moved away from the driving rod, the switching component drives the other driving slot to move closer to the driving rod.

[0014] In the above-mentioned magnetic levitation centrifugal chiller, the switching assembly includes two first abutting parts fixed to the horizontal plate, and the two blocking parts are respectively provided with second abutting parts, and the two second abutting parts are arranged corresponding to the two first abutting parts.

[0015] In the above-mentioned magnetic levitation centrifugal chiller, a sliding portion is provided on the horizontal plate.

[0016] In the above technical solution, the present invention provides a magnetic levitation centrifugal chiller, in which a first valve and a second valve are respectively provided at the positions where the first pipe and the second pipe are connected, and a linkage mechanism is provided between the first valve and the second valve. When one of the valves rotates, the linkage mechanism drives the other valve to rotate synchronously, so that the working status of the two pipes can be adjusted at the same time, thereby simplifying the maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall external structure provided by an embodiment of the present invention; Figure 2 A schematic cross-sectional view of an embodiment of the present invention; Figure 3 A schematic diagram of the internal structure provided by an embodiment of the present invention; Figure 4 A schematic diagram of the internal structure provided for another embodiment of the present invention; Figure 5 A schematic diagram of the overall structure provided for yet another embodiment of the present invention; Figure 6 A schematic diagram of the connection structure between a horizontal plate and a U-shaped member provided in yet another embodiment of the present invention.

[0019] Description of reference numerals: 1. First pipeline; 2. Second pipeline; 3. First valve; 4. Second valve; 5. Horizontal plate; 6. First connecting rod; 7. First transmission rod; 8. Second connecting rod; 9. Second transmission rod; 10. Capillary tube; 11. Expansion valve body; 12. Sealing part; 13. Adjusting knob; 14. Disc; 15. Elastic member; 16. Shell; 17. Diaphragm; 18. Drive rod; 19. Adjusting chamber; 20. Drive groove; 21. First abutting part; 22. Second abutting part; 23. Sliding part; 24. Horizontal groove; 25. First friction part; 26. Valve bonnet; 27. Second friction part; 28. U-shaped member; 29. ​​Third pipeline; 30. Connecting part. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] In the description of the present invention, it is to be understood that Figure 2The position of the middle capillary 10 relative to the driving rod 18 is up, and vice versa. The terms "center", "length", "width", "degrees", "up", "down", "vertical", "horizontal", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] Reference Figure 1-6 An embodiment of the present invention provides a magnetic levitation centrifugal chiller, comprising a first pipe 1 and a second pipe 2 for conveying refrigerant, wherein the first pipe 1 and the second pipe 2 are each provided with an expansion mechanism, the first pipe 1 is in communication with the second pipe 2, and a first valve 3 and a second valve 4 are provided at the position where the first pipe 1 and the second pipe 2 communicate; A linkage mechanism is provided between the first valve 3 and the second valve 4. When one valve rotates, the linkage mechanism drives the other valve to rotate synchronously.

[0023] Specifically, a centrifugal chiller includes a compressor, an evaporator, a condenser, and an expansion valve. The input end of the expansion valve is connected to the condenser, and the output end of the expansion valve is connected to the evaporator. The high-temperature and high-pressure refrigerant liquid (hereinafter referred to as liquid for the convenience of description) transported through the condenser enters the expansion valve. Since the valve port of the expansion valve is relatively narrow, the local resistance of the liquid when passing through the valve port is very large. The liquid itself will expand, and flash will occur during the process, causing the high-temperature and high-pressure liquid to be converted into a low-temperature and low-pressure liquid. The liquid will enter the evaporator to achieve refrigeration, and a temperature sensing package is provided at the outlet of the evaporator. The temperature sensing package senses the temperature of the evaporator outlet and adjusts the size of the expansion valve port adaptively according to the temperature. This is the existing technology and will not be repeated. One of the core innovations of the embodiment of the present invention is that a first pipe 1 and a second pipe 2 are provided. The first pipe 1 and the second pipe 2 are two refrigerant transport channels of the chiller, and a first valve 3 and a second valve 4 are provided at the position where the first pipe 1 and the second pipe 2 are connected, respectively. , and a third pipe 29 is provided at the connection position between the first pipe 1 and the second pipe 2. The first valve 3 and the second valve 4 are both three-way valves. The first valve 3 and the second valve 4 are used to connect one of the pipes to the third pipe 29, and a linkage mechanism is provided between the first valve 3 and the second valve 4. The purpose of this arrangement is that when the first pipe 1 is in an operating state, the first valve 3 and the second valve 4 respectively connect the two ends of the first pipe 1 with the third pipe 29. When the expansion mechanism corresponding to the first pipe 1 malfunctions, one of the valves is manually or electrically controlled to rotate 90 degrees to block one end of the first pipe 1 (and connect that end of the second pipe 2 with the third pipe 29). At the same time, the linkage mechanism drives the other valve to rotate synchronously to block the other end of the first pipe 1 (and connect the other end of the second pipe 2 with the third pipe 29). At this time, the first pipe 1 is in an inoperative state, while the second pipe 2 is in an operating state. This facilitates simultaneous adjustment of the operating states of the first pipe 1 and the second pipe 2, thereby simplifying the maintenance process.

[0024] Preferably, the linkage mechanism includes a horizontal plate 5, a first connecting rod 6 is rotatably provided on the horizontal plate 5, a first transmission rod 7 is fixedly connected to the first valve 3, and the first connecting rod 6 is rotatably connected to the first transmission rod 7. Specifically, the horizontal plate 5 is provided below the pipeline, and a first valve stem is provided at the bottom end of the first valve 3 passing through the pipeline. Figure 3As shown, the first transmission rod 7 is fixed to the outer peripheral surface of the first valve stem, and rotating holes are provided on the surface of the horizontal plate 5 and the first transmission rod 7. The two ends of the first connecting rod 6 are respectively rotatably connected to the two rotating holes. The purpose of such a setting is to control the horizontal plate 5 to approach or move away from the first valve stem through the existing reciprocating drive components such as the cylinder. Under the transmission action of the first connecting rod 6 and the first transmission rod 7, the first valve 3 will be driven to rotate 90° forward and backward, so that the third pipe 29 can be controlled to be connected to one end of the first pipe 1 or the second pipe 2.

[0025] Furthermore, a second connecting rod 8 is rotatably mounted on the horizontal plate 5, and a second transmission rod 9 is fixedly mounted on the second valve 4, with the second connecting rod 8 being rotatably connected to the second transmission rod 9. Specifically, a second valve stem is mounted through the pipe at the bottom end of the second valve 4, and the second transmission rod 9 is fixedly mounted on the outer circumferential surface of the second valve stem. Rotation holes are provided on the surface of the other end of the horizontal plate 5 and the second transmission rod 9, and the two ends of the second connecting rod 8 are rotatably connected to the two rotation holes. This arrangement enables, when the horizontal plate 5 drives the first connecting rod 6 toward the first valve 3, the second connecting rod 8 moves away from the second valve stem. Under the transmission action of the second connecting rod 8 and the second transmission rod 9, the second valve 4 is driven to rotate 90 degrees forward and backward (the rotation direction is opposite to the rotation direction of the first valve 3), thereby controlling the communication between the third pipe 29 and the other end of the first pipe 1 or the second pipe 2. In this way, the operating state of the second valve 4 can be adjusted simultaneously with the operating state of the first valve 3, which is convenient and quick.

[0026] Furthermore, the system further includes two temperature sensing components, and the two expansion mechanisms are connected to the two temperature sensing components, respectively. Specifically, the temperature sensing components include two temperature sensing packages (not shown) disposed at the evaporator outlet. The two temperature sensing packages are connected to the two expansion mechanisms via two capillary tubes 10, respectively, to adjust the operating conditions of the two expansion mechanisms.

[0027] It should be noted that in the above embodiment, two temperature-sensing bulbs need to be installed on the outlet of the evaporator at the same time, so that the two temperature-sensing bulbs are in working state at the same time, but only one of the two expansion mechanisms is in working state, so that one of the temperature-sensing bulbs is in idle state, which undoubtedly increases the risk of damage to the temperature-sensing bulbs. As another embodiment of the present invention, a temperature-sensing component is also included, and the two expansion mechanisms share one temperature-sensing component. The effect of such a setting is that when the first pipe 1 is in working state, the temperature-sensing component is connected to the expansion mechanism corresponding to the first pipe 1 and disconnected from the expansion mechanism corresponding to the second pipe 2. When the second pipe 2 is in working state, the temperature-sensing component is connected to the expansion mechanism corresponding to the second pipe 2 and disconnected from the expansion mechanism corresponding to the first pipe 1. In this way, the two expansion mechanisms can be controlled by one temperature-sensing component, which can reduce the risk of damage to the temperature-sensing bulbs compared to the case where two temperature-sensing bulbs are used at the same time.

[0028] Furthermore, the expansion mechanism includes an expansion valve body 11, a sealing portion 12 is slidingly provided inside the expansion valve body 11, an adjusting knob 13 is threadedly connected to the inside of the expansion valve body 11, a disc 14 is rotatably provided on the adjusting knob 13, and an elastic member 15 is provided between the disc 14 and the sealing portion 12; the temperature sensing component includes a shell 16 and a diaphragm 17 arranged inside the shell 16, a drive rod 18 is provided on the diaphragm 17, and the sealing portion 12 is connected to the drive rod 18. Specifically, a connecting portion 30 is provided between the two expansion valve bodies 11, a through hole is provided in the connecting portion 30, and the horizontal plate 5 is slidably connected to the through hole. An adjusting chamber 19 is provided at the bottom of the expansion valve body 11, and the blocking portion 12 is a cylindrical structure with a frustum-shaped top. The blocking portion 12 is slidably provided inside the adjusting chamber 19 and is located below the valve port. The adjusting knob 13 is placed in the adjusting chamber 19, and the disc 14 is rotatably provided at one end of the adjusting knob 13 close to the blocking portion 12, and a convex ring or the like is provided between the two to prevent the two from separating from each other. The elastic member 15 is preferably a spring, and the adjusting knob 13 is provided with a groove for applying force with a screwdriver. The housing 16 is flat, and the diaphragm 17 is a disc. The top end of the diaphragm 17 is connected to the temperature-sensing package through the capillary 10. The driving rod 18 is arranged above the blocking portion 12, and the connection between the blocking portion 12 and the driving rod 18 can be abutted or fixed. The effect of such a setting is that the elastic member 15 provides elastic force so that the top end of the blocking portion 12 blocks the valve port, and the end of the blocking portion 12 abuts against the bottom end of the driving rod 18. Under the action of liquid pressure, the valve port is closed. When the valve is used, an annular slit is generated between the blocking portion 12 and the valve port, and the liquid passes through the slit to expand. By rotating the adjusting knob 13 forward and backward to adjust the elastic force of the elastic member 15, the size of the slit can be adjusted (that is, when the elastic force of the elastic member 15 is greater, the force it exerts on the position of the valve port is greater, and the liquid pressure causes the gap of the valve port to be smaller. At this time, the flow rate of the liquid becomes smaller, and vice versa. After the elastic force of the elastic member 15 is adjusted, it is generally not adjusted again during normal use). When the temperature at the evaporator outlet exceeds 500V, the evaporator outlet temperature will be increased. When the temperature is high, it means that the refrigerant supply is small at this time. At this time, the temperature-sensing package transfers heat to the diaphragm 17 through the capillary tube 10, causing the diaphragm 17 to bend downward. When the force is greater than the elastic force of the elastic member 15, the blocking portion 12 will be driven to move downward, and the elastic member 15 will be charged. When the temperature at the evaporator outlet position returns to normal, the diaphragm 17 will recover, and at this time, the driving rod 18 will be driven to move upward, and the elastic force of the elastic member 15 will be released to drive the blocking portion 12 to move upward, so that the position of the valve port can be restored, thereby realizing adaptive adjustment of the valve port opening.

[0029] In the above-mentioned scheme, the elastic forces of the two elastic members 15 act on the driving rod 18 at the same time, that is, at this time the sum of the elastic forces of the two elastic members 15 can balance the force of the driving rod 18. When one of the elastic members 15 is removed during the maintenance process, the equilibrium state between the driving rod 18 and the blocking portion 12 will be broken. At this time, it is necessary to adjust the elastic force of the other elastic member 15 to a double value before the balance can be restored again. The process is relatively cumbersome. Preferably, a driving groove 20 is respectively provided inside the two blocking portions 12, and the driving rod 18 is slidably connected to the two driving grooves 20 at the same time; when the inner bottom wall of one of the driving grooves 20 abuts against the bottom end of the driving rod 18, the inner bottom wall of the other driving groove 20 is away from the bottom end of the driving rod 18; and a switching component is also included. When one of the driving grooves 20 is away from the driving rod 18, the switching component drives the other driving groove 20 to approach the driving rod 18. Specifically, the driving groove 20 is opened at the top of the blocking part 12, and the driving rod 18 is Y-shaped, one end of which is fixed to the diaphragm 17, and the other two ends are respectively slidably connected to the two driving grooves 20. The switching component can be an existing electric push rod or other linear reciprocating drive group, and preferably two. The effect of such a setting is that, as far as the first pipeline 1 is in a working state, its corresponding switching component is not working. At this time, the blocking part 12 is under the action of the elastic force of the elastic member 15, so that the inner bottom wall of the driving groove 20 abuts against the bottom end of the driving rod 18. At this time, when the driving rod 18 moves downward, it will drive the blocking part 12 to move downward synchronously to realize the passive downward movement of the valve port. At the same time, another switching component controls the blocking part 12 to move down to the lowest point. At this time, the inner bottom wall of the driving groove 20 corresponding to the second pipeline 2 is in contact with the driving rod 1 8 is away from the end thereof, that is, the force of the driving rod 18 will not be transmitted to the blocking portion 12. At this time, only the elastic member 15 corresponding to the first pipe 1 generates a force on the driving rod 18. When the expansion mechanism corresponding to the first pipe 1 is abnormal, the blocking portion 12 is controlled to move downward by the switching component, so that the driving groove 20 inside it is away from the bottom end of the driving rod 18, and the elastic member 15 is stored. At the same time, the switching component corresponding to the second pipe 2 is canceled. At this time, the blocking portion 12 is controlled to move upward under the elastic force of the elastic member 15, and the inner bottom wall of its driving groove 20 is abutted against the bottom end of the driving rod 18 to realize power transmission, that is, only one elastic member 15 acts in the whole process. Therefore, there is no need to adjust the elastic force of the elastic member 15 again during maintenance.

[0030] As an alternative to the above-mentioned two electric push rods driving the two blocking parts 12 to move respectively, preferably, the switching assembly includes two first abutting parts 21 fixed to the horizontal plate 5, and the two blocking parts 12 are respectively provided with second abutting parts 22, and the two second abutting parts 22 are arranged correspondingly with respect to the two first abutting parts 21. Specifically, the first abutting part 21 is a rod-shaped structure, and there are two of them. The two first abutting parts 21 are symmetrically arranged on the two side walls of the horizontal plate 5, and arc-shaped surfaces are provided on the end faces. There are also two second abutting parts 22. The two second abutting parts 22 are respectively fixed to the outer peripheral surface of the blocking part 12, and the second abutting parts 22 are provided with wedge-shaped surfaces. The directions of the two wedge surfaces are arranged symmetrically. The effect of such a setting is that, with respect to the first pipe 1 being in a working state, its corresponding second abutting part 22 is located on the movement stroke of the first abutting part 21 (that is, Figure 4 The first abutting portion 21 and the second abutting portion 22 on the left side of the middle portion are in contact with each other), that is, at this time, the second abutting portion 22 is not in contact with the first abutting portion 21. At this time, the elastic force of the elastic member 15 is released, so that the blocking portion 12 is in a working state. At the same time, the second abutting portion 22 corresponding to the second pipe 2 is in contact with the first abutting portion 21 (that is, Figure 4 The first abutting portion 21 and the second abutting portion 22 on the right side are located in the middle. Under the action of the first abutting portion 21, the second abutting portion 22 is placed at the lowest point, thereby placing the blocking portion 12 at the lowest point as a whole. At this time, the blocking portion 12 is in an inoperative state. When it is necessary to inspect the expansion mechanism corresponding to the first pipeline 1, the horizontal plate 5 is controlled to move horizontally, thereby controlling the first valve 3 and the second valve 4 to rotate, so as to block the first pipeline 1 and open the second pipeline 2. In this process, the two first abutting portions 21 are driven to move synchronously, so that the first abutting portion 21 corresponding to the first pipeline 1 moves toward the direction close to the wedge-shaped surface of the second abutting portion 22. The second abutting portion 22 and the blocking portion 12 move upward, and the driving groove 20 is driven away from the driving rod 18, so that the blocking portion 12 is passively switched from the working state to the non-working state for maintenance. At the same time, the first abutting portion 21 corresponding to the second pipe 2 moves in the direction away from the wedge-shaped surface of the second abutting portion 22, so that the elastic force of the elastic member 15 is released, so that the second abutting portion 22 and the blocking portion 12 move upward, so that the blocking portion 12 is passively switched from the non-working state to the working state, thereby realizing the synchronous and passive switching of the two blocking portions 12.

[0031] It should be noted that if the refrigerant contains a large amount of water and the evaporation temperature drops below 0°C, ice will form at the valve port of the expansion mechanism, causing "ice blockage". To solve the ice blockage problem, as another embodiment of the present invention, a sliding portion 23 is provided on the horizontal plate 5. Specifically, in this embodiment, the first abutting portion 21 is fixedly connected to the sliding portion 23. A horizontal groove 24 is provided on the horizontal plate 5. The sliding portion 23 is a square cylindrical structure and is sleeved on the horizontal groove 24. The length of the horizontal groove 24 is greater than that of the sliding portion 23, so that the sliding portion 23 has a certain sliding space in the horizontal groove 24. The bottom end of the sliding portion 23 is fixedly connected to a connecting plate, and the cylinder can be connected to the connecting plate to achieve driving. The effect of this arrangement is that when adjusting the working state of the two valves, the extension and contraction of the cylinder output end will cause the sliding portion 23 to slide first. Only when the sliding portion 23 abuts the inner wall of the horizontal groove 24 will it drive the entire horizontal plate 5 to move horizontally to achieve the switching of the valve working state. That is, the sliding portion 23 moves in the horizontal groove 24. In the initial stage of sliding in the length direction, it will not abut against the horizontal groove 24, and will not adjust the working state of the two valves. However, in the initial stage of sliding of the sliding part 23, it will drive the first abutting part 21 to slide, so that the first abutting part 21 and the second abutting part 22 will abut normally. In this process, the blocking part 12 that is "blocked by ice" will move downward to release the adhesion effect of the ice cubes, thereby achieving the effect of clearing the blockage. When the blockage is cleared, the sliding part 23 is controlled to slide in the opposite direction to achieve reset. After the elastic force of the elastic part 15 drives the blocking part 12 that is "blocked by ice" to reset, if the refrigerant can flow normally, it means that the blockage is cleared successfully. Therefore, there is no need to disassemble the expansion valve body 11 to achieve automatic clearing. If the blockage is not successfully cleared, the above steps can be repeated 2-3 times. If the problem is still not solved, the expansion valve body 11 needs to be disassembled for inspection.

[0032] Furthermore, a first friction portion 25 is provided on the horizontal plate 5, a valve cap 26 is threadedly connected to the expansion valve body 11, and a second friction portion 27 is provided on the valve cap 26. The first friction portion 25 and the second friction portion 27 are frictionally driven. Specifically, the valve cap 26 is provided at the bottom of the adjustment chamber 19, which can prevent dust from entering and is used to protect the position of the adjustment knob 13. A U-shaped part 28 is provided at the bottom end of the horizontal plate 5. The first friction portion 25 is provided on the two side walls of the U-shaped part 28, and the second friction portion 27 is provided on the outer peripheral surface of the valve cap 26. The first friction portion 25 and the second friction portion 27 can be made of rubber material. The effect of such a setting is that during the horizontal sliding process of the horizontal plate 5, the first friction portion 25 will be driven to move synchronously. Under the transmission action between the first friction portion 25 and the second friction portion 27, the two valve caps 26 will be driven to rotate in opposite directions, so that the valve cap 26 corresponding to the expansion valve body 11 that needs to be repaired will rotate in the opening direction, so as to facilitate Remove the valve bonnet 26, and at the same time rotate the valve bonnet 26 corresponding to the expansion valve body 11 that does not require maintenance in the tightening direction (if the valve bonnet 26 is already in a tightened state, the valve bonnet 26 cannot continue to rotate, and the first friction part 25 and the second friction part 27 will rub hard against each other to achieve avoidance), thereby preventing the valve bonnet 26 from loosening. Another benefit is that under the action of the friction transmission between the first friction part 25 and the second friction part 27, a reaction force will be provided to the second friction part 27 to play a flexible limiting role on the horizontal plate 5, so that the sliding part 23 slides horizontally to achieve clearing, and the horizontal plate 5 will not slide, thereby improving the stability of the first valve 3 and the second valve 4 during operation.

[0033] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A magnetic levitation centrifugal chiller, characterized in that: The refrigerant comprises a first pipe and a second pipe for conveying refrigerant, wherein the first pipe and the second pipe are each provided with an expansion mechanism, the first pipe is connected to the second pipe, and a first valve and a second valve are provided at the position where the first pipe and the second pipe are connected; A linkage mechanism is provided between the first valve and the second valve. When one valve rotates, the linkage mechanism drives the other valve to rotate synchronously.

2. A magnetic levitation centrifugal chiller according to claim 1, characterized in that: The linkage mechanism includes a horizontal plate, a first connecting rod is rotatably provided on the horizontal plate, a first transmission rod is fixedly connected to the first valve, and the first connecting rod is rotatably connected to the first transmission rod.

3. A magnetic levitation centrifugal chiller according to claim 2, characterized in that: A second connecting rod is rotatably provided on the horizontal plate, a second transmission rod is fixedly connected to the second valve, and the second connecting rod is rotatably connected to the second transmission rod.

4. The magnetic levitation centrifugal chiller according to claim 1, characterized in that: It also includes two temperature sensing components, and the two expansion mechanisms are respectively connected to the two temperature sensing components.

5. The magnetic levitation centrifugal chiller according to claim 2, characterized in that: It also includes a temperature sensing component, and the two expansion mechanisms share the same temperature sensing component.

6. The magnetic levitation centrifugal chiller according to claim 5, characterized in that: The expansion mechanism includes an expansion valve body, a blocking portion is slidably provided inside the expansion valve body, an adjusting knob is threadedly connected to the expansion valve body, a disc is rotatably provided on the adjusting knob, and an elastic member is provided between the disc and the blocking portion; The temperature sensing component includes a shell and a diaphragm arranged inside the shell. A driving rod is arranged on the diaphragm, and the blocking portion is connected to the driving rod.

7. The magnetic levitation centrifugal chiller according to claim 6, characterized in that: A driving groove is respectively provided inside the two blocking parts, and the driving rod is slidingly connected to the two driving grooves at the same time; when the inner bottom wall of one of the driving grooves abuts against the bottom end of the driving rod, the inner bottom wall of the other driving groove is away from the bottom end of the driving rod.

8. The magnetic levitation centrifugal chiller according to claim 7, characterized in that: It also includes a switching component, which drives the other driving groove and the driving rod to move closer when one of the driving grooves is away from the driving rod.

9. The magnetic levitation centrifugal chiller according to claim 8, characterized in that: The switching assembly includes two first abutting portions fixedly connected to the horizontal plate, and the two blocking portions are respectively provided with second abutting portions, and the two second abutting portions are arranged corresponding to the two first abutting portions.

10. The magnetic levitation centrifugal chiller according to claim 6, characterized in that: The horizontal plate is provided with a sliding portion.

Images