A dry vacuum pump screw clearance adjustment structure

Abstract

This utility model relates to the field of vacuum pump technology, and in particular to a screw clearance adjustment structure for a dry vacuum pump. It includes a machined part with an adjustment hole and a through hole on its surface. A first sliding plate is fixedly connected to one side of the machined part. This utility model has the following advantages: the size of the adjustment hole can be adjusted using a first adjusting member, a first rotating groove, a first positioning member, and a first spring; turning the first limiting nut to press against the first sliding plate limits the first adjusting member; the size of the through hole can be adjusted using a second adjusting member, a second rotating groove, a transmission plate, a third rotating groove, a second positioning member, and a second spring; turning the second limiting nut to press against the second sliding plate limits the first adjusting member. This configuration allows the adjustment hole and through hole to accommodate screws of different specifications, thereby improving the structure's adaptability to different types of vacuum pumps.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pumps, and in particular to a screw clearance adjustment structure for a dry vacuum pump. Background Technology

[0002] Dry vacuum pumps, also known as oil-free vacuum pumps, are a new type of vacuum-generating equipment that meets the stringent vacuum environment requirements of industrial production. They require no lubricating oil within the pump chamber, avoiding the risk of oil contamination. They can operate within a pressure range from atmospheric pressure to 10⁻² Pa and are widely used in aerospace, semiconductor, pharmaceutical, and chemical industries. The screw clearance adjustment structure of a dry vacuum pump is designed to ensure efficient pump operation by precisely controlling the clearance between the screw and the pump housing, and between the screw and the housing. The goal is to keep the clearance within a reasonable range that does not affect pumping performance (large clearance leads to leakage and reduced vacuum) or increase frictional energy consumption (small clearance leads to increased friction and wear on vulnerable parts).

[0003] In existing technologies, some dry vacuum pump screw clearance adjustment structures require the following steps: First, an M14*2.0 screw is passed through a hole in the machined surface and connected to the internal thread of the M14*2.0 screw on the back plate of the drive shaft gear. Then, an M20*2.5 screw with a nut (tightened on the hexagonal head side of the screw) is passed through an adjustment hole and connected to the internal thread of the M20*2.5 screw at the center of the drive shaft (with the nut unloaded). A feeler gauge is then used to measure the clearance values ​​on both the drive side (the clearance between the upper parts of the screw's mounting surfaces and the clearance between the screw and the outer wall) and the non-drive side (the clearance between the upper parts of the screw's mounting surfaces and the clearance between the screw and the outer wall). During adjustment, it is crucial to ensure that the M14 screw... *2.0 With the screws loose and not under stress, slowly adjust the nut on the M20 screw to move the axial side with the smaller clearance (the direction of the smaller clearance was previously determined by measuring the clearance between the drive side and the non-drive side with a feeler gauge). This will change the assembly clearance between the two screws. When the clearance is adjusted evenly and within a suitable range, keep the M20*2.5 screw and nut in the adjustment hole still and tighten the M14 screw (tightening the inner and outer tapered sleeve locking gears in the drive shaft gear). This will complete the adjustment of the screw clearance of the dry vacuum pump. However, the through hole and adjustment hole in the adjustment structure are only compatible with M14 and M20 screws, which limits the applicability of the adjustment structure and makes it difficult to apply to different models of vacuum pumps. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a dry vacuum pump screw clearance adjustment structure. This addresses the problem that the through holes and adjustment holes in some dry vacuum pump screw clearance adjustment structures mentioned in the background art are only compatible with M14 and M20 screws, resulting in a limited range of applicability and making it difficult to apply to different models of vacuum pumps.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dry vacuum pump screw clearance adjustment structure, comprising a machined part, an adjustment hole and a through hole on the surface of the machined part, a first sliding plate fixedly connected to one side of the machined part, a second sliding plate fixedly connected to one side of the machined part, a first positioning member slidably connected in the adjustment hole, a first spring sleeved on the surface of the first positioning member, a first rotating groove on the inner wall of the machined part, a first adjusting member slidably connected in the first rotating groove, a first limiting nut threadedly connected to the surface of the first adjusting member, a second positioning member slidably connected in the through hole, a second spring sleeved on the surface of the second positioning member, a second rotating groove on the inner wall of the machined part, a second adjusting member slidably connected in the second rotating groove, a second limiting nut threadedly connected to the surface of the second adjusting member, and a third rotating groove on the inner wall of the machined part, a transmission plate slidably connected in the third rotating groove, the transmission plate engaging with the second adjusting member;

[0006] A housing is disposed on the outside of the machined part.

[0007] Optionally, the housing further includes:

[0008] A groove is formed on the surface of the housing;

[0009] The slide block is slidably connected within the slide groove;

[0010] The fixing nut is threaded onto the surface of the slide.

[0011] Optionally, the end of the first positioning member near the first adjusting member and the end of the second positioning member near the transmission plate are both triangular, and the end of the first positioning member away from the first adjusting member and the end of the second positioning member away from the transmission plate are both arc-shaped.

[0012] Optionally, the first rotating groove, the second rotating groove, and the third rotating groove are all annular, and the vertical cross-section of the slide is T-shaped.

[0013] Optionally, a first scale mark is provided on one side of the first skateboard, and a second scale mark is provided on one side of the second skateboard.

[0014] Optionally, a first washer is fitted on the surface of the first adjusting member on the side of the first limiting nut, a second washer is fitted on the surface of the second adjusting member on the side of the second limiting nut, and a third washer is fitted on the surface of the slide block on the side of the fixing nut.

[0015] Optionally, the sum of the lengths of the machined part and the first slide plate is less than the length of the housing, and the sum of the lengths of the machined part and the second slide plate is less than the length of the housing.

[0016] Optionally, a handle is fixedly connected to the top of the housing, and the handle is U-shaped.

[0017] The beneficial effects of this utility model are as follows: By rotating the first adjusting member, the size of the adjusting hole can be adjusted in conjunction with the first rotating groove, the first positioning member, and the first spring. By tightening the first limiting nut so that it presses against the first sliding plate, the first adjusting member can be limited. By rotating the second adjusting member, the size of the through hole can be adjusted in conjunction with the second rotating groove, the transmission plate, the third rotating groove, the second positioning member, and the second spring. By tightening the second limiting nut so that it presses against the second sliding plate, the first adjusting member can be limited. Through the above settings, the adjusting hole and the through hole can be adapted to screws of different specifications, thereby improving the adaptability of the structure to different models of vacuum pumps. Attached Figure Description

[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of a dry vacuum pump screw clearance adjustment structure according to the present invention;

[0020] Figure 2 This utility model relates to a dry vacuum pump screw clearance adjustment structure. Figure 1 Enlarged structural diagram at point A in the middle;

[0021] Figure 3 This is a cross-sectional view of a machined part of a dry vacuum pump screw clearance adjustment structure according to the present invention.

[0022] Figure 4 This utility model relates to a dry vacuum pump screw clearance adjustment structure. Figure 3 Enlarged structural diagram at point B;

[0023] Figure 5 This utility model relates to a dry vacuum pump screw clearance adjustment structure. Figure 3 Enlarged structural diagram at point C;

[0024] Figure 6 This is a schematic diagram of the first rotating groove structure of a dry vacuum pump screw clearance adjustment structure according to the present invention;

[0025] Figure 7 This is a schematic diagram of the first adjusting component of a dry vacuum pump screw clearance adjustment structure according to the present invention.

[0026] Figure 8 This is a schematic diagram of the second adjusting component of a dry vacuum pump screw clearance adjustment structure according to the present invention;

[0027] Figure label:

[0028] 1. Machined part; 101. Adjusting hole; 102. Through hole; 103. First slide plate; 1031. First scale mark; 104. Second slide plate; 1041. Second scale mark; 105. First positioning component; 106. First spring; 107. First rotating groove; 108. First adjusting component; 109. First limiting nut; 110. Second positioning component; 111. Second spring; 112. Second rotating groove; 113. Second adjusting component; 114. Second limiting nut; 115. Third rotating groove; 116. Transmission plate; 117. First washer; 118. Second washer;

[0029] 1. Housing; 201. Slide groove; 202. Slide block; 203. Fixing nut; 204. Third washer; 205. Handle. Detailed Implementation

[0030] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0031] Please see Figures 3 to 8 This utility model provides a technical solution: a dry vacuum pump screw clearance adjustment structure, comprising: a machined part 1, an adjustment hole 101 and a through hole 102 on the surface of the machined part 1, a first sliding plate 103 fixedly connected to one side of the machined part 1, a second sliding plate 104 fixedly connected to one side of the machined part 1, a first positioning member 105 slidably connected in the adjustment hole 101, a first spring 106 sleeved on the surface of the first positioning member 105, a first rotating groove 107 on the inner wall of the machined part 1, a first adjusting member 108 slidably connected in the first rotating groove 107, and the surface of the first adjusting member 108... A first limiting nut 109 is threadedly connected to the surface of the machined part 1. A second positioning element 110 is slidably connected inside the through hole 102. A second spring 111 is sleeved on the surface of the second positioning element 110. A second rotating groove 112 is opened on the inner wall of the machined part 1 outside the first rotating groove 107. A second adjusting element 113 is slidably connected inside the second rotating groove 112. A second limiting nut 114 is threadedly connected to the surface of the second adjusting element 113. A third rotating groove 115 is opened on the inner wall of the machined part 1 outside the second rotating groove 112. A transmission plate 116 is slidably connected inside the third rotating groove 115. The transmission plate 116 meshes with the second adjusting element 113.

[0032] Rotating the first adjusting member 108 causes its two sides to slide along the first rotating groove 107 formed on the inner wall of the machined part 1 and the first sliding plate 103 fixed to one side of the machined part 1, respectively. During this process, the first adjusting member 108 will drive the first positioning member 105 to slide along the inner wall of the adjusting hole 101 through several triangular blocks on its inner side, causing the first spring 106 to extend and retract, thereby adjusting the size of the adjusting hole 101. Tightening the first limiting nut 109 so that it presses tightly against the first sliding plate 103 can limit the first adjusting member 108. Rotating the second adjusting member 113 causes its two sides to slide along the second rotating groove 112 formed on the inner wall of the machined part 1 and the first sliding plate 103 fixed to one side of the machined part 1, respectively. The second slide plate 104 slides, and during this process, the second adjusting member 113 will drive several transmission plates 116 that mesh with it to slide along the third rotating groove 115 provided on the inner wall of the machined part 1. The transmission plates 116 will then drive the second positioning member 110 to slide along the inner wall of the through hole 102 through several triangular blocks on their inner side, and cause the second spring 111 to extend and retract, thereby adjusting the size of the through hole 102. Tightening the second limiting nut 114 so that it presses against the second slide plate 104 can limit the first adjusting member 108. Through the above settings, the adjusting hole 101 and the through hole 102 can be adapted to screws of different specifications, thereby improving the adaptability of the structure to different models of vacuum pumps.

[0033] Furthermore, the end of the first positioning member 105 near the first adjusting member 108 and the end of the second positioning member 110 near the transmission plate 116 are both triangular, and the end of the first positioning member 105 away from the first adjusting member 108 and the end of the second positioning member 110 away from the transmission plate 116 are both arc-shaped.

[0034] The first positioning member 105 is triangular at the end near the first adjusting member 108, allowing it to slide along the inner wall of the adjusting hole 101 after contacting the first adjusting member 108. The second positioning member 110 is triangular at the end near the transmission plate 116, allowing it to slide along the inner wall of the through hole 102 after contacting the transmission plate 116. The ends of the first positioning member 105 away from the first adjusting member 108 and the ends of the second positioning member 110 away from the transmission plate 116 are both arc-shaped, allowing the first positioning member 105 and the second positioning member 110 to fit more closely to the screw surface, thus facilitating screw insertion.

[0035] Furthermore, a first scale mark 1031 is provided on one side of the first skateboard 103, and a second scale mark 1041 is provided on one side of the second skateboard 104.

[0036] The size of the adjustment hole 101 can be accurately controlled by the first scale mark 1031, and the size of the perforation 102 can be accurately controlled by the second scale mark 1041.

[0037] Please see Figures 1 to 8The present invention provides a technical solution: a housing 2 is provided on the outer side of the machined part 1, a sliding groove 201 is provided on the surface of the housing 2, a sliding seat 202 is slidably connected in the sliding groove 201, and a fixing nut 203 is threadedly connected to the surface of the sliding seat 202.

[0038] Pulling the machined part 1 causes it to slide along the groove 201 opened on the surface of the housing 2. The position of the machined part 1 can be adjusted. Tightening the fixing nut 203 will make it press against the slide 202 and the housing 2, which will increase the friction between the slide 202 and the groove 201, thereby limiting the slide 202.

[0039] Furthermore, a first washer 117 is fitted on the surface of the first adjusting member 108 on one side of the first limiting nut 109, a second washer 118 is fitted on the surface of the second adjusting member 113 on one side of the second limiting nut 114, and a third washer 204 is fitted on the surface of the slide block 202 on one side of the fixing nut 203.

[0040] The first washer 117 increases the friction between the first limiting nut 109 and the first sliding plate 103, thereby improving the limiting effect on the first adjusting member 108. Similarly, the second washer 118 and the third washer 204 can respectively enhance the limiting effect on the second adjusting member 113 and the slide block 202.

[0041] Furthermore, the sum of the lengths of the machined part 1 and the first slide plate 103 is less than the length of the housing 2, and the sum of the lengths of the machined part 1 and the second slide plate 104 is less than the length of the housing 2.

[0042] The sum of the lengths of the machined part 1 and the first slide plate 103 is less than the length of the shell 2, and the sum of the lengths of the machined part 1 and the second slide plate 104 is less than the length of the shell 2 to prevent the first slide plate 103 and the second slide plate 104 from extending out of the shell 2, thereby reducing the probability of the first slide plate 103 and the second slide plate 104 being collided with by the outside.

[0043] Preferably, a handle 205 is fixedly connected to the top of the housing 2, and the handle 205 is U-shaped.

[0044] The handle 205 facilitates carrying.

[0045] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dry vacuum pump screw clearance adjustment structure, characterized in that, include: A machined part has an adjustment hole and a through hole on its surface. A first sliding plate and a second sliding plate are fixedly connected to one side of the machined part. A first positioning element is slidably connected in the adjustment hole, and a first spring is sleeved on the surface of the first positioning element. A first rotating groove is formed in the inner wall of the machined part, and a first adjusting element is slidably connected in the first rotating groove. A first limiting nut is threadedly connected to the surface of the first adjusting element. A second positioning element is slidably connected in the through hole, and a second spring is sleeved on the surface of the second positioning element. A second rotating groove is formed in the inner wall of the machined part, and a second adjusting element is slidably connected in the second rotating groove. A second limiting nut is threadedly connected to the surface of the second adjusting element. A third rotating groove is formed in the inner wall of the machined part, and a transmission plate is slidably connected in the third rotating groove. The transmission plate meshes with the second adjusting element. A housing is disposed on the outside of the machined part.

2. The dry vacuum pump screw clearance adjustment structure according to claim 1, characterized in that, The housing also includes: A groove is formed on the surface of the housing; The slide block is slidably connected within the slide groove; The fixing nut is threaded onto the surface of the slide.

3. The dry vacuum pump screw clearance adjustment structure according to claim 1, characterized in that, The end of the first positioning member near the first adjusting member and the end of the second positioning member near the transmission plate are both triangular, and the end of the first positioning member away from the first adjusting member and the end of the second positioning member away from the transmission plate are both arc-shaped.

4. The dry vacuum pump screw clearance adjustment structure according to claim 2, characterized in that, The first, second, and third rotating grooves are all annular, and the vertical cross-section of the slide is T-shaped.

5. The dry vacuum pump screw clearance adjustment structure according to claim 1, characterized in that, The first skateboard has a first scale mark on one side, and the second skateboard has a second scale mark on one side.

6. The dry vacuum pump screw clearance adjustment structure according to claim 2, characterized in that, The first adjusting member has a first washer fitted on the side of the first limiting nut, the second adjusting member has a second washer fitted on the side of the second limiting nut, and the slide has a third washer fitted on the side of the fixing nut.

7. The dry vacuum pump screw clearance adjustment structure according to claim 1, characterized in that, The sum of the lengths of the machined part and the first slide plate is less than the length of the shell, and the sum of the lengths of the machined part and the second slide plate is less than the length of the shell.

8. The dry vacuum pump screw clearance adjustment structure according to claim 2, characterized in that, A handle is fixedly connected to the top of the housing, and the handle is U-shaped.

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