Screw clearance adjusting device of double-screw variable-pitch dry vacuum pump

Abstract

The utility model provides a screw clearance adjusting device of a double-screw variable-pitch dry vacuum pump, which belongs to the technical field of adjusting tools and comprises a base, a distance adjusting mechanism is arranged on one side of the top of the base and comprises a first side plate, a mounting plate, a first deflection plate, a second deflection plate and a third deflection plate, the first side plate is arranged on one side of the top of the base, the mounting plate is arranged on the side portion of the first side plate, and a connecting plate is arranged at one end of the front portion of the first deflection plate through a movable shaft. By arranging the distance adjusting mechanism, during use, the first side plate can be in compression lap joint with the pump body, when the lever principle is used for prying distance adjustment, applied force can be dispersed in a large area, components of the vacuum pump are protected, and the pump body is prevented from being extruded and damaged by a crowbar in a large area; the pump body and the first side plate can keep a good contact state, and normal work of screws in the double-screw pump cannot be affected by local deformation.

Description

Technical Field

[0001] This utility model relates to the field of adjustment tool technology, specifically to a screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump. Background Technology

[0002] A twin-screw vacuum pump is a rotary positive displacement vacuum pump. It consists of a pair of meshing screw rotors that rotate synchronously and in opposite directions within the pump chamber, achieving periodic changes in the working chamber volume. This completes the process of gas intake, compression, and discharge, creating a vacuum at the pump inlet. It has advantages such as being dry and oil-free, operating smoothly, having few vulnerable parts, and low vibration and noise. It is widely used in aerospace, electronics, petrochemical, and nuclear industries.

[0003] When adjusting the screw pitch, the existing method generally involves using one hand to hold one screw in place with a pry bar, while the other hand holds the other pry bar to pry it open. However, this method causes significant pressure damage to the contact surface between the pry bar and the pump body. Single-person operation requires one hand to hold the screw in place and the other hand to make the adjustment, which directly halves the work efficiency. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump that overcomes or at least partially solves the above technical problems.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump, including a base, and an adjustment mechanism is provided on one side of the top of the base;

[0007] The adjusting mechanism includes:

[0008] The first side plate is located on one side of the top of the base.

[0009] Mounting plate, the mounting plate being disposed on the side of the first side plate;

[0010] The first deflection plate has a connecting plate at one end of its front part via a movable shaft.

[0011] The second deflection plate has its front bottom connected to the connecting plate via a movable shaft, and the side of the second deflection plate is fixedly connected to the first pry bar.

[0012] The third deflection plate is connected to the side of the mounting plate via a movable shaft.

[0013] In one embodiment of the present invention, a first through shaft is provided at one end of the first deflection plate, a handle is provided at the top of the first deflection plate, and the first deflection plate is movably connected to the front side of the mounting plate through the first through shaft. A second through shaft is provided at the top of the second deflection plate, and the second deflection plate is connected to the front side of the mounting plate through the second through shaft.

[0014] In one embodiment of this utility model, the top of the third deflection plate is provided with a limiting rod via a movable shaft, and a first mounting block is fixedly connected to one side of the back of the mounting plate. A spring is provided on the side of the first mounting block, and the first mounting block is connected to the side of the third deflection plate via the spring.

[0015] In one embodiment of the present invention, the first side plate is provided with a vertically arranged straight groove, which is located on one side of the first deflection plate.

[0016] In one embodiment of the present invention, a fixing mechanism is provided on the other side of the top of the base, the fixing mechanism including a second side plate, the second side plate being fixedly installed on the top of the base.

[0017] In one embodiment of this utility model, a double-axis plate is provided on one side of the second side plate, and a second mounting block is provided on the double-axis plate via a movable shaft. A vertically arranged second pry bar is fixedly connected to the second mounting block.

[0018] In one embodiment of this utility model, a threaded shaft is threadedly connected to the body of the second crowbar, a limiting plate is fixedly connected to one end of the threaded shaft, an intermediate ring is sleeved on the shaft body of the threaded shaft, and a nut threadedly connected to the threaded shaft is provided on one side of the intermediate ring.

[0019] In one embodiment of this utility model, a clamping plate is fixedly connected to the other end of the threaded shaft, and a long strip-shaped through groove is provided on the second side plate.

[0020] This utility model provides a screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump, the beneficial effects of which include:

[0021] 1. By setting up an adjustment mechanism, the first side plate will be pressed and overlapped with the pump body during use. When the adjustment is made by levering the principle, the applied force will be dispersed over a large area, protecting the components of the vacuum pump and preventing the pry bar from causing large-area squeezing damage to the pump body. After the force of the pry bar is dispersed, the pump body and the first side plate can maintain a good contact state and will not affect the normal operation of the internal screw of the twin-screw pump due to local deformation.

[0022] 2. By setting a fixing mechanism, the threaded shaft can firmly tighten the second pry bar, so that a special component can fix the screw that does not need to be moved, eliminating the need for manual operation. This frees up one hand for the operator to perform the adjustment operation. The operator does not need to pay attention to fixing the screw and adjusting the distance at the same time. The free hand can perform the adjustment action more freely, making the adjustment process more flexible and precise. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model;

[0025] Figure 2 A rear perspective view provided for an embodiment of this utility model;

[0026] Figure 3 A schematic diagram of the adjusting mechanism structure provided for an embodiment of this utility model;

[0027] Figure 4 A rear perspective view of the adjusting mechanism provided for an embodiment of this utility model.

[0028] In the diagram: 1. Base; 2. Adjustment mechanism; 201. First side plate; 2011. Straight groove; 202. Mounting plate; 203. First deflection plate; 2031. Handle; 204. Second deflection plate; 205. Connecting plate; 206. First through shaft; 2061. First pry bar; 207. Second through shaft; 208. Third deflection plate; 2081. Limiting rod; 209. First mounting block; 210. Spring; 3. Fixing mechanism; 301. Second side plate; 3011. Second pry bar; 3012. Second mounting block; 302. Double shaft plate; 303. Threaded shaft; 3031. Limiting plate; 3032. Intermediate ring; 3033. Nut; 3034. Clamping plate. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] Example

[0031] Reference Figures 1-4 This technical solution provides a screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump, which includes a base 1, and a clearance adjustment mechanism 2 on one side of the top of the base 1. The clearance adjustment mechanism 2 includes: a first side plate 201, a mounting plate 202, a first deflection plate 203, a second deflection plate 204, and a third deflection plate 208. The first side plate 201 is located on one side of the top of the base 1, and the mounting plate 202 is located on the side of the first side plate 201. One end of the front of the first deflection plate 203 is connected to a connecting plate 205 via a movable shaft. The side of the second deflection plate 204... A first pry bar 2061 is fixedly connected, and a third deflection plate 208 is connected to the side of the mounting plate 202 via a movable shaft. By setting an adjustment mechanism 2, the first side plate 201 will press against the pump body during use. When the adjustment is made by prying using the lever principle, the applied force will be dispersed over a large area, protecting the components of the vacuum pump and preventing the pry bar from causing large-area squeezing damage to the pump body. After the force of the pry bar is dispersed, the pump body and the first side plate 201 can maintain a good contact state and will not affect the normal operation of the internal screw of the twin-screw pump due to local deformation.

[0032] Reference Figures 1-4 Based on the same concept as Embodiment 1 above, this embodiment also proposes that one end of the first deflection plate 203 is provided with a first through shaft 206, the top of the first deflection plate 203 is provided with a handle 2031, the first deflection plate 203 is movably connected to the front side of the mounting plate 202 through the first through shaft 206, the top of the second deflection plate 204 is provided with a second through shaft 207, and the second deflection plate 204 is connected to the front side of the mounting plate 202 through the second through shaft 207.

[0033] Reference Figures 1-4Based on the same concept as Embodiment 1 above, this embodiment also proposes that the top of the third deflection plate 208 is provided with a limiting rod 2081 via a movable shaft, and a first mounting block 209 is fixedly connected to one side of the back of the mounting plate 202. A spring 210 is provided on the side of the first mounting block 209. The first mounting block 209 is connected to the side of the third deflection plate 208 via the spring 210. After the bottom of the second pry bar 3011 is pressed, the first pry bar 2061 also overlaps with the body of the screw to be adjusted. The clamping plate 3034 is clamped with a wrench, and the nut 3033 is rotated at the same time. The threaded shaft 303 moves closer to the second side plate 301 until the nut 3033 can no longer be turned, which is considered to be stable fixation. Then, the handle 2031 is pressed, and the top of the first deflection plate 203 is offset, causing the connecting plate 205 to move to one side. At this time, the top of the second deflection plate 204 does not offset, but the bottom is offset to one side, which is considered to be the bottom of the second pry bar 3011 moving the screw to be adjusted.

[0034] Reference Figures 1-4 Based on the same concept as in Embodiment 1 above, this embodiment also proposes that the first side plate 201 has a vertically arranged straight groove 2011, which is located on one side of the first deflection plate 203 to accommodate the movement of the first deflection plate 203.

[0035] Reference Figures 1-4 Based on the same concept as Embodiment 1 above, this embodiment also proposes that a fixing mechanism 3 be provided on the other side of the top of the base 1. The fixing mechanism 3 includes a second side plate 301, which is fixedly installed on the top of the base 1. By setting the fixing mechanism 3, the threaded shaft 303 can firmly pull the second pry bar 3011, so that a special component can fix the screw that does not need to be moved, eliminating the need for manual operation. This frees up one hand for the operator to perform the distance adjustment operation. The operator does not need to pay attention to fixing the screw and performing the distance adjustment operation at the same time. The free hand can perform the distance adjustment operation more freely, making the distance adjustment process more flexible and precise.

[0036] Reference Figures 1-4 Based on the same concept as in Embodiment 1 above, this embodiment also proposes that a double-shaft plate 302 is provided on one side of the second side plate 301, and a second mounting block 3012 is provided on the double-shaft plate 302 through a movable shaft. A vertically arranged second pry bar 3011 is fixedly connected to the second mounting block 3012. The base 1 is installed on the flush part of the pump body. At this time, the first side plate 201 and the second side plate 301 respectively overlap with the side wall of the vacuum pump pitch adjustment opening. First, rotate the nut 3033 to easily loosen the second pry bar 3011, and then press the bottom of the second pry bar 3011 tightly.

[0037] Reference Figures 1-4Based on the same concept as in Embodiment 1 above, this embodiment also proposes that the second pry bar 3011 has a threaded shaft 303 threadedly connected to its body, one end of the threaded shaft 303 is fixedly connected to a limiting plate 3031, an intermediate ring 3032 is sleeved on the shaft of the threaded shaft 303, and a nut 3033 threadedly connected to the threaded shaft 303 is provided on one side of the intermediate ring 3032.

[0038] Reference Figures 1-4 Based on the same concept as Embodiment 1 above, this embodiment also proposes that the other end of the threaded shaft 303 is fixedly connected to a clamping plate 3034, and a long strip-shaped through groove is provided on the second side plate 301 to accommodate the movement of the threaded shaft 303.

[0039] Specifically, the working process or working principle of the screw gap adjustment device of the twin-screw variable pitch dry vacuum pump is as follows: When in use, the base 1 is installed on the flush part of the pump body. At this time, the first side plate 201 and the second side plate 301 are respectively connected to the side wall of the screw gap adjustment opening of the vacuum pump. First, rotate the nut 3033 to loosen the second pry bar 3011. After pressing the bottom of the second pry bar 3011, the first pry bar 2061 is also connected to the body of the screw to be adjusted. Use a wrench to clamp the clamping plate 3034, and at the same time rotate the nut 3033. The threaded shaft 303 moves closer to the second side plate 301 until the nut 3033 can no longer be turned, which is considered to be stable and fixed. Then press the handle 2031, and the top of the first deflection plate 203 is offset, so that the connecting plate 205 moves to one side. At this time, the top of the second deflection plate 204 does not deflect, but the bottom deflects to one side, which is considered to be the bottom of the second pry bar 3011 moving the screw to be adjusted.

[0040] It should be noted that the nut 3033 is a device or equipment that exists in the prior art, or a device or equipment that can be implemented by the prior art. Its power supply, specific composition and principle are clear to those skilled in the art, so they will not be described in detail.

Claims

1. A screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump, comprising a base (1), characterized in that: The base (1) is provided with an adjustment mechanism (2) on one side of its top, and the adjustment mechanism (2) includes: The first side plate (201) is located on one side of the top of the base (1); Mounting plate (202), the mounting plate (202) is disposed on the side of the first side plate (201); The first deflection plate (203) has a connecting plate (205) at one end of its front part via a movable shaft. The second deflection plate (204) has its front bottom connected to the connecting plate (205) via a movable shaft, and the side of the second deflection plate (204) is fixedly connected to the first pry bar (2061). The third deflection plate (208) is connected to the side of the mounting plate (202) via a movable shaft.

2. The screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump according to claim 1, characterized in that, The first deflection plate (203) has a first through shaft (206) at one end and a handle (2031) at the top. The first deflection plate (203) is movably connected to the front side of the mounting plate (202) through the first through shaft (206). The second deflection plate (204) has a second through shaft (207) at the top. The second deflection plate (204) is connected to the front side of the mounting plate (202) through the second through shaft (207).

3. The screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump according to claim 1, characterized in that, The top of the third deflection plate (208) is provided with a limiting rod (2081) via a movable shaft. A first mounting block (209) is fixedly connected to one side of the back of the mounting plate (202). A spring (210) is provided on the side of the first mounting block (209). The first mounting block (209) is connected to the side of the third deflection plate (208) via the spring (210).

4. The screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump according to claim 1, characterized in that, The first side plate (201) has a vertically arranged straight groove (2011), which is located on one side of the first deflection plate (203).

5. The screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump according to claim 4, characterized in that, A fixing mechanism (3) is provided on the other side of the top of the base (1). The fixing mechanism (3) includes a second side plate (301), which is fixedly installed on the top of the base (1).

6. The screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump according to claim 5, characterized in that, A double-shaft plate (302) is provided on one side of the second side plate (301). A second mounting block (3012) is provided on the double-shaft plate (302) via a movable shaft. A vertically arranged second pry bar (3011) is fixedly connected to the second mounting block (3012).

7. The screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump according to claim 6, characterized in that, The second pry bar (3011) has a threaded shaft (303) threadedly connected to its body. One end of the threaded shaft (303) is fixedly connected to a limiting plate (3031). An intermediate ring (3032) is sleeved on the shaft of the threaded shaft (303). A nut (3033) threadedly connected to the threaded shaft (303) is provided on one side of the intermediate ring (3032).

8. The screw clearance adjustment device for a twin-screw variable pitch dry vacuum pump according to claim 7, characterized in that, The other end of the threaded shaft (303) is fixedly connected to a clamping plate (3034), and a long strip-shaped through groove is provided on the second side plate (301).

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