Roots pump rotor gap adjusting assembly

Abstract

The utility model discloses a rotor clearance adjusting assembly of a roots pump, which comprises a first positioning piece, a second positioning piece, a third positioning piece and a fourth positioning piece, the second positioning piece is provided with a screw rod, a screw hole corresponding to the screw rod is formed in the second positioning piece, the screw rod is fixed in the screw hole, and the screw rod is matched with the limiting piece to adjust the rotor gap of the roots pump; the limiting piece limits the position of the first rotor, the screw rod changes the position of the second rotor, the limiting piece is fixed through the first positioning piece, the screw rod is fixed through the second positioning piece, and therefore the gap between the two rotors can be adjusted only by adjusting the position of the screw rod, operation is easy and efficient, compared with manual limiting and rotating, the operation is more accurate, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to vacuum pump assembly equipment, in particular to a Roots pump rotor gap adjustment component. Background Art

[0002] A Roots vacuum pump (abbreviated as: Roots pump) is a variable displacement vacuum pump that is equipped with two leaf-shaped rotors rotating synchronously in opposite directions. There is a small gap between the rotors and between the rotors and the inner wall of the pump casing, and they do not contact each other.

[0003] Roots vacuum pumps have proven themselves in long-term operation in applications such as petroleum, chemical, plastics, pesticides, turbine rotor dynamic balancing, and aerospace simulation, and therefore warrant vigorous promotion and application in China. They are also widely used in the petroleum, chemical, metallurgical, and textile industries. Vacuum pump accessories, such as vacuum pump silencers, are used to control vacuum pump noise.

[0004] During assembly, the rotor gap between Roots pumps must be within a certain width. Improper rotor gaps can lead to the following problems: A gap that is too small can cause the rotors to seize, generate abnormal noise, and even damage the pump in severe cases. A gap that is too large can cause gas backflow, reducing pumping efficiency and affecting pump performance. Therefore, the gap between the rotors must be accurately adjusted. Traditionally, this adjustment method involves manually positioning one rotor and then manually rotating the other. Once the rotors are close together, a feeler gauge is used to measure the gap width between the two rotors. This manual positioning and pushing method is prone to adjustment errors, and the operation is complex and inefficient. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, which are prone to adjustment errors due to manual positioning and pushing, as well as complex and inefficient operation, the utility model provides a Roots pump rotor gap adjustment assembly, comprising:

[0006] The first positioning member is provided with a limiting member, and the limiting member is fixed on the first positioning member;

[0007] The second positioning member is provided with a screw rod. The second positioning member is provided with a screw hole corresponding to the screw rod. The screw rod is fixed in the screw hole. The screw rod cooperates with the limiting member to adjust the rotor clearance of the Roots pump.

[0008] Optionally, a first through hole is provided on the first positioning member.

[0009] Optionally, the first positioning member is a plate-shaped structure, the first through hole is provided at the head of the first positioning member, the limiting member is fixed at the tail of the first positioning member, and the width of the head is greater than the width of the tail.

[0010] Optionally, the top end of the limiting member is fixedly connected to the first positioning member, and the end of the limiting member is provided with an interference portion.

[0011] Optionally, a step is provided on the top of the limiting member, and the first positioning member is in conflict with the step.

[0012] Optionally, the interference portion is a bent portion at the end of the limiting member.

[0013] Optionally, a second through hole is provided on the second positioning member.

[0014] Optionally, the second positioning member is a plate-shaped structure, the second through hole is provided at the head of the second positioning member, the screw hole is provided at the tail of the second positioning member, and the width of the head of the second positioning member is greater than the width of the tail of the second positioning member.

[0015] Optionally, the lowest surface of the end of the limiting member is set to a curved surface.

[0016] Optionally, a nut is provided on the top of the screw rod, and the radius of the nut is larger than the radius of the screw hole.

[0017] The beneficial effects of the present invention are as follows: the first positioning member 1 is fixed to the edge of the air inlet 306 of the Roots pump 3, the limiting member 101 is fixed to the first positioning member 1, the fixed limiting member 101 passes through the air inlet 306 and is located in the shell 301, the second positioning member 2 is also fixed to the edge of the air inlet 306 of the Roots pump 3, the position of the second positioning member 2 is symmetrical with the position center of the first positioning member 1, the screw 201 is fixed to the screw hole of the second positioning member 2, the screw 201 also passes through the air inlet 306 and is located in the shell 301, a feeler gauge 4 with a predetermined thickness (gap piece) is extended from the air inlet 306 into the shell 301, the gauge of the feeler gauge 4 is located between the first rotor 302 and the second rotor 303, the screw 201 is screwed on the second positioning member 2, the screw 201 moves downward and contacts and pushes the second rotor 303, and the second rotor 303 rotates and moves When the first rotor 302 approaches, the first rotor 302 also rotates with the second rotor 303, but the first rotor 302 will conflict with the limit member 101 and be restricted from rotating. The second rotor 303 presses the blade of the feeler gauge 4 against the first rotor 302, so that the gap between the first rotor 302 and the second rotor 303 is maintained at a predetermined width. Then, the first rotating shaft 304 and the second rotating shaft 305 are fixed by gears to adjust the gap between the first rotor 302 and the second rotor 303. The limit member 101 limits the position of the first rotor 302, and the screw 201 changes the position of the second rotor 303. The limit member 1 is fixed by the first positioning member 1 and the screw 201 is fixed by the second positioning member 2. Therefore, the gap between the two rotors can be adjusted by adjusting the position of the screw 201. The operation is simple and efficient, and it is more accurate than manual limiting and rotation, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 is a schematic structural diagram of gap adjustment in some embodiments;

[0020] Figure 2 This is a structural diagram of a Roots pump rotor gap adjustment assembly provided by the utility model being installed at the air inlet of the Roots pump;

[0021] Figure 3 is a schematic diagram of the assembly of the first positioning member and the limiting member in some embodiments;

[0022] Figure 4 Schematic diagram of the assembly of the second positioning member and the screw in some embodiments.

[0023] Explanation of the accompanying reference numerals: 1. First positioning member; 101. Limiting member; 2. Second positioning member; 201. Screw; 102. First through hole; 103. Interference portion; 202. Second through hole; 3. Roots pump; 301. Housing; 302. First rotor; 303. Second rotor; 304. First rotating shaft; 305. Second rotating shaft; 306. Air inlet; 4. Feeler gauge. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0025] The traditional Roots pump 3 includes a housing 301, a first rotor 302, a second rotor 303, a first rotating shaft 304, and a second rotating shaft 305. An air inlet 306 is provided on the top of the housing 301. The first rotating shaft 304 and the second rotating shaft 305 are installed in parallel in the housing 301. The first rotor 302 is installed on the first rotating shaft 304, and the second rotor 303 is installed on the second rotating shaft 305. The first rotor 302 and the second rotor 303 rotate in opposite directions. The first rotating shaft 304 and the second rotating shaft 305 are fixed by gears. The embodiment provided by the present utility model takes the rotor gap adjustment of the above-mentioned traditional Roots pump 3 as an example.

[0026] The utility model provides a rotor clearance adjustment assembly for a Roots pump 3, which is used to adjust the rotor clearance of the Roots pump 3, and includes: a first positioning member provided with a limiting member 101, wherein the limiting member 101 is fixed to the first positioning member 1; a second positioning member 2 provided with a screw 201, wherein the second positioning member 2 is provided with a screw hole corresponding to the screw 201, wherein the screw 201 is fixed in the screw hole, and the screw 201 cooperates with the limiting member 101 to adjust the rotor clearance of the Roots pump 3. The first positioning member 1 is used to fix the position of the limiting member 101, and the limiting member 101 is used to limit the position of the first rotor 302; the second positioning member 2 is used to fix the position of the screw 201, and the screw 201 is used to push the second rotor 303 closer to the first rotor 302.

[0027] During implementation, the first positioning member 1 is fixed to the edge of the air inlet 306 of the Roots pump 3, and the limiting member 101 is fixed to the first positioning member 1. The fixed limiting member 101 passes through the air inlet 306 and is located in the housing 301. The second positioning member 2 is also fixed to the edge of the air inlet 306 of the Roots pump 3. The position of the second positioning member 2 is symmetrical with the center of the position of the first positioning member 1. The screw 201 is fixed to the screw hole of the second positioning member 2. The screw 201 also passes through the air inlet 306 and is located in the housing 301. A feeler gauge 4 with a predetermined thickness (gap piece) is extended from the air inlet 306 into the housing 301 so that the gauge of the feeler gauge 4 is located between the first rotor 302 and the second rotor 303. The screw 201 is screwed on the second positioning member 2 to move the screw 201 downward and push the second rotor 303 against it. The second rotor 303 rotates accordingly and moves toward the first rotor 302 approaches, the first rotor 302 also rotates with the second rotor 303, but the first rotor 302 will conflict with the limiting member 101 and be restricted from rotating. The second rotor 303 presses the blade of the feeler gauge 4 onto the first rotor 302, so that the gap between the first rotor 302 and the second rotor 303 is maintained at a predetermined width. Then, the first rotating shaft 304 and the second rotating shaft 305 are fixed by gears, so as to adjust the gap between the first rotor 302 and the second rotor 303. The limiting member 101 limits the position of the first rotor 302, and the screw 201 changes the position of the second rotor 303. The limiting member 101 is fixed by the first positioning member 1 and the screw 201 is fixed by the second positioning member 2. Therefore, the gap between the two rotors can be adjusted by adjusting the position of the screw 201. The operation is simple and efficient, and it is more accurate than manual limiting and rotation, thereby improving work efficiency.

[0028] Furthermore, the edge of the air inlet 306 of the traditional Roots pump 3 is provided with a plurality of screw holes arranged in a surrounding manner. The first positioning member 1 and the second positioning member 2 can be fixed to the edge of the air inlet 306 by a screw 201 adapted to the screw holes, and can also be fixed to the edge of the air inlet 306 by clamping with a splint.

[0029] In some embodiments, a first through hole 102 is provided on the first positioning member 1 .

[0030] During implementation, the limiting member 101 is fixed to the first positioning member 1, the first through hole 102 on the first positioning member 1 is aligned with the screw hole at the edge of the air inlet 306, and then the first positioning member 1 is fixed to the edge of the air inlet 306 using screws that are compatible with the screw holes at the edge of the air inlet 306. The limiting member 101 is located inside the air inlet 306 to contact the first rotor 302. The first positioning member 1 can be well fixed at the air inlet 306 by the screws, and after the adjustment is completed, it is also convenient to remove the first positioning member 1 from the air inlet 306 without affecting the subsequent work of the Roots pump 3 itself.

[0031] Furthermore, in order to keep the first positioning member 1 balanced, two first through holes 102 are provided on the first positioning member 1. In some cases, the number of through holes on the first positioning member 1 may also be more than two.

[0032] In some embodiments, the first positioning member 1 is a plate-shaped structure, the first through hole 102 is provided at the head of the first positioning member 1 , the limiting member 101 is fixed at the tail of the first positioning member 1 , and the width of the head is greater than the width of the tail.

[0033] During implementation, the head of the first positioning member 1 is placed on the edge of the air inlet 306, and the first through hole 102 on the head is aligned with the screw hole on the edge of the air inlet 306, and the first positioning member 1 is fixed by screws. The tail of the first positioning member 1 is located above the air inlet 306, and the limiting member 101 installed on the tail of the first positioning member 1 enters the air inlet 306. The width of the head of the first positioning member 1 is greater than the width of the tail. The wide head is beneficial to improving the stability of the first positioning member 1. The tail is located above the air inlet 306, and the narrow tail is beneficial to reducing the obstruction of the field of view of the air inlet 306, which is convenient for personnel to make adjustments at the air inlet 306.

[0034] In some cases, in order to further reduce the obstruction of the view of the air inlet 306 by the first positioning member 1 , an opening may also be provided on the first positioning member 1 .

[0035] In some embodiments, the top end of the limiting member 101 is fixedly connected to the first positioning member 1 , and the end of the limiting member 101 is provided with an interference portion 103 .

[0036] During implementation, the position of the limiting member 101 is fixed on the first positioning member 1, and a resistance portion 103 is provided at the end of the limiting member 101. During the adjustment process, the first rotor 302 is in resistance against the resistance portion 103 at the end of the limiting member 101, thereby limiting the rotation of the first rotor 302.

[0037] Furthermore, a screw hole is provided on the first positioning member 1, and a through hole corresponding to the screw hole is provided on the limiting member 101. The limiting member 101 is fixed to the first positioning member 1 by a screw adapted to the screw hole on the first positioning member 1, and the limiting member 101 and the first positioning member 1 are perpendicular to each other.

[0038] In some cases, the limiting member 101 may also be integrally formed with the first positioning member 1 .

[0039] In some embodiments, a step is provided on the top of the limiting member 101 , and the first positioning member 1 abuts against the step.

[0040] During implementation, the stepped portion of the top of the limiting member 101 is brought into contact with the first positioning member 1 , and then the top of the limiting member 101 is fixed to the first positioning member 1 . The step can further enhance the connection stability between the first positioning member 1 and the limiting member 101 .

[0041] In some embodiments, the interference portion 103 is a bent portion at the end of the limiting member 101 .

[0042] During implementation, the end of the limiting member 101 is bent to form a resistance portion 103, and the bent portion has a concave surface and a convex surface. Before adjustment, the concave portion is aligned with the first rotor 302, and the convex portion is away from the first rotor 302. When the first rotor 302 rotates, it will be resisted by the concave portion. The resistance portion 103 formed by the bend can better limit the first rotor 302.

[0043] In some embodiments, the lowest surface of the end of the limiting member 101 is configured as a curved surface.

[0044] During implementation, the lowest surface of the end of the limiting member 101 is set to be a curved surface, which can prevent the limiting member 101 from damaging the first rotor 302 when it conflicts with the first rotor 302 .

[0045] In some embodiments, a second through hole 202 is provided on the second positioning member 2 .

[0046] During implementation, the screw 201 is fixed in the screw hole of the second positioning member 2, the second through hole 202 on the second positioning member 2 is aligned with the screw hole at the edge of the air inlet 306, and then the second positioning member 2 is fixed to the edge of the air inlet 306 using a screw that is compatible with the screw hole at the edge of the air inlet 306. The screw 201 is located in the air inlet 306 to push the second rotor 303. The second positioning member 2 can be well fixed at the air inlet 306 by the screw, and when the adjustment is completed, it is also convenient to remove the first positioning member 1 from the air inlet 306 without affecting the subsequent work of the Roots pump 3 itself.

[0047] Furthermore, in order to keep the second positioning member 2 balanced, two second through holes 202 are provided on the second positioning member 2. In some cases, the number of through holes on the second positioning member 2 may also be more than two.

[0048] In some embodiments, the second positioning member 2 is a plate-like structure, the second through hole 202 is provided at the head of the second positioning member 2 , the screw hole is provided at the tail of the second positioning member 2 , and the width of the head of the second positioning member 2 is greater than the width of the tail of the second positioning member 2 .

[0049] During implementation, the head of the second positioning member 2 is placed on the edge of the air inlet 306, and the second through hole 202 on the head is aligned with the screw hole on the edge of the air inlet 306, and the second positioning member 2 is fixed by screws. The tail of the second positioning member 2 is located above the air inlet 306, and the screw 201 is screwed into the screw hole at the tail of the second positioning member 2. The screw 201 enters the air inlet 306. The width of the head of the second positioning member 2 is greater than the width of the tail. The wide head is beneficial to improving the stability of the second positioning member 2. The tail is located above the air inlet 306. The narrow tail is beneficial to reducing the obstruction of the field of view of the air inlet 306, which is convenient for personnel to make adjustments at the air inlet 306.

[0050] In some embodiments, a nut is provided on the top of the screw rod 201 , and the radius of the nut is larger than the radius of the screw hole.

[0051] During implementation, the screw rod 201 is screwed by rotating the nut, so that the screw rod 201 moves up and down in the screw hole.

[0052] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A Roots pump rotor clearance adjustment assembly, characterized in that: include: The first positioning member is provided with a limiting member, and the limiting member is fixed on the first positioning member; The second positioning member is provided with a screw rod. The second positioning member is provided with a screw hole corresponding to the screw rod. The screw rod is fixed in the screw hole. The screw rod cooperates with the limiting member to adjust the rotor clearance of the Roots pump.

2. The Roots pump rotor clearance adjustment assembly according to claim 1, characterized in that: The first positioning member is provided with a first through hole.

3. The Roots pump rotor clearance adjustment assembly according to claim 2, characterized in that: The first positioning member is a plate-shaped structure, the first through hole is provided at the head portion of the first positioning member, the limiting member is fixed at the tail portion of the first positioning member, and the width of the head portion is greater than the width of the tail portion.

4. The Roots pump rotor clearance adjustment assembly according to claim 1, characterized in that: The top end of the limiting member is fixedly connected to the first positioning member, and the end of the limiting member is provided with a resisting portion.

5. The Roots pump rotor clearance adjustment assembly according to claim 1, characterized in that: A step is provided on the top of the limiting member, and the first positioning member abuts against the step.

6. The Roots pump rotor clearance adjustment assembly according to claim 4, characterized in that: The interference portion is a bent portion at the end of the limiting member.

7. The Roots pump rotor clearance adjustment assembly according to claim 1, characterized in that: The second positioning member is provided with a second through hole.

8. The Roots pump rotor clearance adjustment assembly according to claim 7, characterized in that: The second positioning member is a plate-shaped structure, the second through hole is provided at the head of the second positioning member, the screw hole is provided at the tail of the second positioning member, and the width of the head of the second positioning member is greater than the width of the tail of the second positioning member.

9. The Roots pump rotor clearance adjustment assembly according to claim 1, characterized in that: The lowest surface of the end of the limiting member is configured as a curved surface.

10. The Roots pump rotor clearance adjustment assembly according to claim 1, characterized in that: A nut is provided on the top of the screw rod, and the radius of the nut is greater than the radius of the screw hole.

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