Gap adjusting device of screw vacuum pump and screw vacuum pump

Abstract

The utility model provides a screw vacuum pump gap adjusting device and a screw vacuum pump. The screw vacuum pump comprises a pump cavity and a screw rotor, the pump cavity is provided with a first end cover located on the air inlet side and a second end cover located on the air outlet side, and the screw rotor is rotatably arranged in the pump cavity and comprises a rotor shaft and a rotor element arranged on the rotor shaft; the gap adjusting device comprises a gap adjusting plate, a driving assembly, a detection assembly and a controller. The gap adjusting plate is movably arranged on the side, facing the rotor element, of the second end cover, and a gap is formed between the gap adjusting plate and the end face of the rotor element. The driving assembly can drive the gap adjusting plate to reciprocate in the axial direction of the rotor element. The detection assembly can detect working state information of the screw vacuum pump; the controller can control the driving assembly to work according to the working state information. According to the clearance adjusting device, the problem of thermal deformation of the screw rotor can be solved through clearance control, and the performance and stability of the screw vacuum pump are guaranteed.

Description

Technical Field

[0001] This application relates to the field of dry screw pump technology, and more specifically, to a screw vacuum pump gap adjustment device and a screw vacuum pump. Background Technology

[0002] In screw vacuum pumps, there are certain gaps between paired screws and between the screws and the pump body. These gaps can cause gas backflow under the influence of pressure difference, and gas backflow can significantly affect the key performance indicators of the vacuum pump, including pumping efficiency, pumping rate, and ultimate pressure.

[0003] However, the high-speed rotation of the screw compresses the gas, causing a temperature increase and resulting in thermal deformation of the rotor. This thermal deformation reduces the clearance between rotors and between the rotor and the pump chamber. In extreme cases, excessively small clearances may lead to mechanical contact or jamming, thus affecting the normal operation of the vacuum pump.

[0004] Therefore, properly controlling the gap size can effectively solve the problem of thermal deformation, which is crucial for ensuring the performance and stability of screw vacuum pumps. Utility Model Content

[0005] This application provides at least one screw vacuum pump gap adjustment device and screw vacuum pump, which can solve the problem of thermal deformation of screw rotor through gap control, and ensure the performance and stability of screw vacuum pump.

[0006] In a first aspect, embodiments of this application provide a screw vacuum pump gap adjustment device. The screw vacuum pump includes a pump chamber and a screw rotor. The pump chamber has a first end cover located on its inlet side and a second end cover located on its outlet side. The screw rotor is rotatably disposed in the pump chamber. The screw rotor includes a rotor shaft and rotor elements disposed on the rotor shaft. The device includes a gap adjustment plate disposed on the second end cover, a drive assembly, a detection assembly, and a controller.

[0007] The gap adjusting plate is movably disposed on the side of the second end cover facing the rotor element, and there is a gap between the gap adjusting plate and the end face of the rotor element;

[0008] The drive assembly is configured to drive the gap adjustment plate to reciprocate along the axial direction of the rotor element;

[0009] The detection component is configured to detect the operating status information of the screw vacuum pump;

[0010] The controller is configured to control the drive assembly to operate according to the operating status information, so that the gap between the gap adjustment plate and the end face of the rotor element is maintained within a preset range.

[0011] In one optional embodiment, the inner wall of the second end cap is provided with a groove, and the gap adjusting plate is movably disposed in the groove.

[0012] In one alternative embodiment, the gap adjusting plate is slidably fitted with the sidewall of the settling tank.

[0013] In one alternative embodiment, the drive assembly is located between the gap adjustment plate and the second end cap.

[0014] In one optional embodiment, the drive assembly includes a push rod, a turbine, and a worm gear. One end of the push rod is vertically connected to the clearance adjusting plate, and the other end of the push rod is threadedly connected to the inner hole of the turbine. The transmission pair formed by the turbine and the worm gear is installed on the bottom wall of the settling tank. The rotational motion of the worm gear is converted into the reciprocating movement of the push rod through the turbine, and the push rod drives the clearance adjusting plate to move.

[0015] In one alternative embodiment, the detection component includes a pressure sensor for detecting the exhaust pressure of the screw vacuum pump, so that the controller controls the drive component to operate when the exhaust pressure reaches a preset value.

[0016] In one alternative embodiment, the pressure sensor is located at the vent of the second end cap.

[0017] In one alternative embodiment, the detection component includes a temperature sensor for detecting the exhaust rotor temperature of the screw vacuum pump, so that the controller controls the drive component to operate when the exhaust rotor temperature reaches a preset value.

[0018] In one alternative embodiment, the temperature sensor is disposed at the shaft seal of the screw rotor.

[0019] Secondly, embodiments of this application also provide a screw vacuum pump, including the screw vacuum pump gap adjustment device described in any embodiment of the first aspect.

[0020] The above-mentioned technical solution of this application has the following beneficial technical effects:

[0021] The screw vacuum pump gap adjustment device of this application embodiment includes a gap adjustment plate, a drive assembly, a detection assembly, and a controller. The controller can control the drive assembly based on the detection information to make the gap adjustment plate reciprocate along the axial direction of the rotor element, thereby adjusting the gap between the gap adjustment plate and the end face of the rotor element. In this way, the thermal deformation problem of the screw rotor can be solved by gap control, ensuring the performance and stability of the screw vacuum pump.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this application and, together with the specification, serve to explain the technical solutions of this application. It should be understood that the following drawings only show some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A structural diagram of a screw vacuum pump provided in an embodiment of this application is shown;

[0025] Figure 2 This illustration shows an assembly diagram of the second end cap and screw rotor provided in an embodiment of this application;

[0026] Figure 3 An assembly diagram of the driving component provided in an embodiment of this application is shown;

[0027] Figure 4 This illustration shows an assembly diagram of the drive component provided in an embodiment of this application from another perspective;

[0028] Figure 5 This illustration shows an assembly diagram of the push rod and clearance adjusting plate provided in an embodiment of this application;

[0029] Figure 6 An assembly diagram of the turbine and the second end cap provided in an embodiment of this application is shown;

[0030] Figure 7 This illustration shows a schematic diagram of the gap adjusting plate before it moves, as provided in an embodiment of this application.

[0031] Figure 8 This illustration shows a schematic diagram of the gap adjusting plate after it has been moved, as provided in an embodiment of this application.

[0032] In the diagram: 1. Pump chamber; 2. First end cover; 3. Second end cover; 31. Settling tank; 32. Bearing; 33. Shaft seal; 4. Screw rotor; 41. Rotor shaft; 42. Rotor element; 100. Gap adjusting plate; 200. Drive assembly; 201. Push rod; 202. Turbine; 203. Worm gear; 204. Turbine support; 300. Detection assembly; 301. Pressure sensor; 302. Temperature sensor; 400. Controller. Detailed Implementation

[0033] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0034] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] refer to Figure 1This application provides a screw vacuum pump, which includes a pump chamber 1 and a screw rotor 4. The pump chamber 1 has a first end cover 2 on its inlet side and a second end cover 3 on its outlet side. The screw rotor 4 is rotatably disposed in the pump chamber 1 and includes a rotor shaft 41 and a rotor element 42 disposed on the rotor shaft 41. During use, the screw rotor 4 can rotate under the drive of an external motor. During the rotation of the screw rotor 4, external gas enters the pump chamber 1 through the inlet of the first end cover 2 and gradually moves axially toward the second end cover 3. As the gas approaches the second end cover 3, the gas is gradually compressed to the required pressure level in the space between the screw teeth. When the gas is compressed to a sufficiently high pressure, the exhaust port of the second end cover 3 opens, and the gas is discharged from the exhaust port outside the pump. It should be noted that the temperature of the gas will rise during the compression process, which may cause thermal deformation of the screw rotor 4, resulting in a smaller gap between rotors and between the rotor and the pump chamber 1, and may even affect the normal operation of the vacuum pump.

[0039] refer to Figures 1 to 6 This application also provides a screw vacuum pump gap adjustment device, which can control the gap between the second end cover 3 and the end face of the rotor element 42, thereby managing the thermal deformation of the screw rotor 4 through gap control and ensuring the performance and stability of the screw vacuum pump.

[0040] Specifically, the adaptive end-face gap adjustment device includes a gap adjustment plate 100, a drive assembly 200, a detection assembly 300, and a controller 400. The gap adjustment plate 100 is movably disposed on the side of the second end cover 3 facing the rotor element 42, and a gap exists between the gap adjustment plate 100 and the end face of the rotor element 42. The drive assembly 200 is configured to drive the gap adjustment plate 100 to reciprocate along the axial direction of the rotor element 42. The detection assembly 300 is configured to detect the operating status information of the screw vacuum pump (this information is used to reflect whether the screw rotor 4 has undergone thermal deformation, such as the exhaust pressure and exhaust end rotor temperature of the screw vacuum pump). The controller 400 is configured to control the drive assembly 200 to operate according to the operating status information (when the screw rotor 4 undergoes thermal deformation), so that the gap between the gap adjustment plate 100 and the end face of the rotor element 42 is maintained within a preset range.

[0041] In the above scheme, the gap adjusting plate 100 is located between the second end cover 3 and the end face of the rotor element 42, and a gap for gas backflow can be formed between the gap adjusting plate 100 and the end face of the rotor element 42. Furthermore, since the gap adjusting plate 100 can move axially along the rotor element 42 under the action of the drive assembly 200, the gap size between the gap adjusting plate 100 and the end face of the rotor element 42 is adjustable. Therefore, when thermal deformation of the rotor element 42 causes a decrease in the gap between its end face and the gap adjusting plate 100, the gap adjusting plate 100 can be moved to keep the gap between the gap adjusting plate 100 and the end face of the rotor element 42 within a preset range, thereby ensuring the normal operation of the vacuum pump. In addition, the drive assembly 200 can be controlled by the controller 400 based on detection information, thus achieving automated control of the gap adjusting plate 100, which is beneficial to improving the system's performance, reliability, and adaptability, while reducing the need for manual intervention and resource consumption.

[0042] Furthermore, since the second end cap 3 is the area with the highest temperature during gas compression, thermal expansion has the most significant impact on the gap. Therefore, by placing the gap adjustment plate 100 on the second end cap 3, it can directly address gap changes caused by thermal deformation and ensure stable system operation.

[0043] It should be noted that in this application, the gap between the gap adjusting plate 100 and the end face of the rotor element 42 is controlled within a certain range, rather than being constant. When adjusting the gap based on temperature or pressure, it is based on the temperature or pressure reaching a certain range, not on adjusting it every time it rises. The specific temperature or pressure range can be set according to specific parameters such as the operating parameters of the vacuum pump, the design value of the vacuum pump vacuum degree, and the materials of the vacuum pump rotor and stator, and is not specifically limited here.

[0044] Optionally, the gap adjusting plate 100, drive assembly 200, detection assembly 300, and controller 400 are all located on the second end cover 3. This arrangement allows for centralized arrangement of the gap adjusting plate 100, drive assembly 200, detection assembly 300, and controller 400, reducing the complexity of pipes, cables, and other connections, and lowering the likelihood of system failure. Furthermore, the second end cover 3 is typically designed for easy disassembly and access, facilitating operation by technicians. Concentrating all critical components on the second end cover 3 reduces the area that maintenance personnel need to inspect, improving work efficiency.

[0045] For example, the gap adjustment plate 100, drive assembly 200, and detection assembly 300 are all located inside the second end cover 3, while the controller 400 is located outside the second end cover 3. Since the second end cover 3 is the area with the highest temperature during gas compression, thermal expansion has the most significant impact on the gap. Therefore, placing the detection assembly 300 inside the second end cover 3 allows for more accurate monitoring of parameters such as exhaust pressure and temperature, and enables rapid response to changes. Placing the controller 400 outside the second end cover 3 ensures that it operates in a relatively stable environment, preventing performance degradation or damage due to excessive temperature, and improving reliability and lifespan.

[0046] Optionally, refer to Figures 1 to 4 The gap adjusting plate 100 is movably disposed within the recess 31 on the inner wall of the second end cover 3. This arrangement utilizes the space within the inner wall of the second end cover 3 to install the gap adjusting plate 100, reducing reliance on external connectors (such as bolts, brackets, etc.) and avoiding additional external expansion, thus contributing to a reduction in the overall size of the equipment. Furthermore, the reduced reliance on external connectors simplifies the assembly and disassembly of the gap adjusting plate 100, requiring no complex tools or procedures.

[0047] Optionally, the gap adjusting plate 100 is slidably fitted with the side wall of the settling trough 31. This configuration allows the settling trough 31 to guide the gap adjusting plate 100, making the movement of the gap adjusting plate 100 more stable and reliable.

[0048] Optionally, the gap adjusting plate 100 is provided with a through hole for the rotor shaft 41 to pass through and be rotatably connected to the bearing 32 of the second end cover 3.

[0049] Optionally, refer to Figure 1 Shaft seals 33 are provided between the bearing 32 of the gap adjusting plate 100 and the second end cover 3 and the rotor shaft 41 to achieve gas sealing.

[0050] Optionally, refer to Figure 4 The drive assembly 200 is located between the gap adjustment plate 100 and the second end cover 3. This arrangement can significantly shorten the transmission path, improve response speed, and control accuracy.

[0051] Optionally, refer to Figure 3 and Figure 4The drive assembly 200 includes a push rod 201, a turbine 202, and a worm gear 203. One end of the push rod 201 is vertically connected to the gap adjusting plate 100, and the other end of the push rod 201 is threadedly connected to the inner hole of the turbine 202. The transmission pair formed by the turbine 202 and the worm gear 203 is installed on the bottom wall of the settling tank 31. The rotational motion of the worm gear 203 is converted into the reciprocating movement of the push rod 201 through the turbine 202, and the push rod 201 drives the gap adjusting plate 100 to move. In specific use, the worm gear 203 can rotate circumferentially under the action of the motor. When the worm gear 203 rotates circumferentially, it can drive the turbine 202 to rotate circumferentially. When the turbine 202 rotates circumferentially, it can drive the push rod 201 to move axially back and forth. When the push rod 201 moves axially back and forth, it can drive the gap adjusting plate 100 to move closer to or further away from the end face of the rotor element 42, thereby realizing the adjustable gap between the gap adjusting plate 100 and the end face of the rotor element 42.

[0052] Optionally, refer to Figure 6 A turbine bracket 204 is provided at the end of the turbine 202 facing the second end cover 3. The turbine bracket 204 is connected to the inner wall of the second end cover 3 to form a planar rotating pair, which allows the turbine 202 to rotate circumferentially on the inner wall plane of the second end cover 3. For example, the turbine bracket 204 can be a sleeve, which is fitted outside the rotating shaft on the inner wall of the second end cover 3 and can rotate circumferentially relative to the rotating shaft. This allows the turbine 202 to be rotatably mounted on the inner wall of the second end cover 3.

[0053] Optionally, the detection component 300 includes a pressure sensor 301, which is used to detect the exhaust pressure of the screw vacuum pump. The exhaust pressure of the screw vacuum pump can reflect whether the screw rotor 4 has undergone thermal deformation. Specifically, after the screw rotor 4 undergoes thermal deformation, the gap between the rotor element 42 and the pump chamber 1 decreases, and the gas is further compressed. Therefore, the thermal deformation of the screw rotor 4 can be determined based on the change in gas pressure. In a specific setting, the pressure sensor 301 can be electrically connected to the controller 400. The pressure sensor 301 can send the detection information to the controller 400, so that the controller 400 controls the drive component 200 to work when the exhaust pressure reaches a preset value. When the drive component 200 works, the drive gap adjustment plate 100 moves along the axial direction of the rotor element 42 in a direction away from the end face of the rotor element 42. Figure 7 and Figure 8 As shown.

[0054] Optionally, the pressure sensor 301 is located at the exhaust port of the second end cover 3. The exhaust port of the second end cover 3 is the final outlet of the gas compression process. By monitoring the exhaust pressure at the exhaust port of the second end cover 3, the change in the gap between the rotor and the pump chamber 1 can be predicted, and the gap size can be adjusted in time to prevent jamming or wear. In addition, since the pressure change at the exhaust port of the second end cover 3 is the most significant and stable, placing the pressure sensor 301 at this location helps to improve the detection accuracy.

[0055] Optionally, the detection component 300 includes a temperature sensor 302, which is used to detect the exhaust rotor temperature of the screw vacuum pump (i.e., the temperature of the screw rotor 4 near the exhaust side). The exhaust rotor temperature of the screw vacuum pump can reflect whether the screw rotor 4 has undergone thermal deformation. Specifically, after the screw rotor 4 undergoes thermal deformation, the gap between the rotor element 42 and the pump chamber 1 decreases, and the gas is further compressed. Therefore, the thermal deformation of the screw rotor 4 can be determined based on the change in the exhaust rotor temperature. In a specific setting, the temperature sensor 302 can be electrically connected to the controller 400. The temperature sensor 302 can send the detection information to the controller 400 so that the controller 400 controls the drive component 200 to work when the exhaust rotor temperature reaches a preset value. When the drive component 200 works, the drive gap adjustment plate 100 moves along the axial direction of the rotor element 42 in a direction away from the end face of the rotor element 42. Figure 7 and Figure 8 As shown.

[0056] Optionally, the temperature sensor 302 is disposed at the shaft seal 33 of the screw rotor 4. The temperature at the shaft seal 33 can directly reflect the degree of thermal expansion of the rotor element 42. By monitoring the temperature of the shaft seal 33, changes in the gap between the rotor and the pump chamber 1 can be predicted, and the gap size can be adjusted in time to prevent jamming or wear. In addition, since the shaft seal 33 is usually designed to be easily disassembled and inspected, placing the temperature sensor 302 here facilitates its installation and maintenance.

[0057] The screw vacuum pump gap adjustment device of this application embodiment includes a gap adjustment plate 100, a drive assembly 200, a detection assembly 300, and a controller 400. The controller 400 can control the drive assembly 200 based on the detection information to make the gap adjustment plate 100 reciprocate along the axial direction of the rotor element 42, thereby adjusting the gap between the gap adjustment plate 100 and the end face of the rotor element 42. In this way, the thermal deformation problem of the screw rotor 4 can be solved by gap control, ensuring the performance and stability of the screw vacuum pump.

[0058] One or more embodiments in this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this specification should be included within the protection scope of this application.

[0059] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A screw vacuum pump clearance adjustment device, the screw vacuum pump comprising a pump chamber and a screw rotor, the pump chamber having a first end cover on its inlet side and a second end cover on its outlet side, the screw rotor being rotatably disposed in the pump chamber, the screw rotor comprising a rotor shaft and rotor elements disposed on the rotor shaft, characterized in that, The device includes a gap adjustment plate, a drive assembly, a detection assembly, and a controller disposed on the second end cover; The gap adjusting plate is movably disposed on the side of the second end cover facing the rotor element, and there is a gap between the gap adjusting plate and the end face of the rotor element; The drive assembly is configured to drive the gap adjustment plate to reciprocate along the axial direction of the rotor element; The detection component is configured to detect the operating status information of the screw vacuum pump; The controller is configured to control the drive assembly to operate according to the operating status information, so that the gap between the gap adjustment plate and the end face of the rotor element is maintained within a preset range.

2. The screw vacuum pump gap adjustment device according to claim 1, characterized in that, The inner wall of the second end cap is provided with a groove, and the gap adjustment plate is movably disposed in the groove.

3. The screw vacuum pump gap adjustment device according to claim 2, characterized in that, The gap adjusting plate slides into the side wall of the settling tank.

4. The screw vacuum pump gap adjusting device according to claim 2, characterized in that, The drive assembly is located between the gap adjustment plate and the second end cap.

5. The screw vacuum pump gap adjusting device according to claim 4, characterized in that, The drive assembly includes a push rod, a turbine, and a worm gear. One end of the push rod is vertically connected to the clearance adjusting plate, and the other end of the push rod is threadedly connected to the inner hole of the turbine. The transmission pair formed by the turbine and the worm gear is installed on the bottom wall of the settling tank. The rotational motion of the worm gear is converted into the reciprocating movement of the push rod through the turbine, and the push rod drives the clearance adjusting plate to move.

6. The screw vacuum pump gap adjusting device according to claim 1, characterized in that, The detection component includes a pressure sensor, which is used to detect the exhaust pressure of the screw vacuum pump so that the controller controls the drive component to work when the exhaust pressure reaches a preset value.

7. The screw vacuum pump gap adjusting device according to claim 6, characterized in that, The pressure sensor is located at the vent of the second end cap.

8. The screw vacuum pump gap adjusting device according to claim 1, characterized in that, The detection component includes a temperature sensor, which is used to detect the exhaust rotor temperature of the screw vacuum pump so that the controller controls the drive component to work when the exhaust rotor temperature reaches a preset value.

9. The screw vacuum pump gap adjusting device according to claim 8, characterized in that, The temperature sensor is located at the shaft seal of the screw rotor.

10. A screw vacuum pump, characterized in that, Includes the screw vacuum pump gap adjustment device as described in any one of claims 1-9.

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