Rotor assembly structure, rotor and rotor set of screw vacuum pump

Abstract

The utility model belongs to the technical field of screw vacuum pumps, and particularly relates to a screw vacuum pump rotor assembly structure, a rotor and a rotor set. In order to overcome the defect that a gap between helical surfaces of two rotors of an existing screw vacuum pump is tedious to adjust, the utility model adopts the following technical scheme that the screw vacuum pump rotor assembly structure comprises a first rotor and a second rotor, a second rotor; the positioning plate is provided with a first matching surface matched with the first angle positioning surface and a second matching surface matched with the second angle positioning surface, and the distance between the first matching surface and the second matching surface is matched with the shaft distance between the first rotor and the second rotor; an end cover; when the first axial positioning face, the second axial positioning face and the radial face coincide, and the first angle positioning face and the second angle positioning face are parallel to the first matching face and the second matching face, the first spiral part and the second spiral part meet the axial, radial and angle requirements. The utility model has the beneficial effects that the assembly difficulty is reduced, the assembly efficiency is improved, and the assembly quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to screw vacuum pump technical field, concretely relates to screw vacuum pump rotor assembly structure, rotor and rotor group. BACKGROUND

[0002] Screw vacuum pump utilizes a pair of synchronous counter-rotating screw in pump cavity realizes gas suction and discharge. Screw vacuum pump has high efficiency, stability, low noise and other advantages, is widely used in chemical industry, pharmacy, semiconductor and other industries. In the design, processing and assembly process of screw vacuum pump, rotor gap is one of the key factors that affect pump performance. These gaps not only include the gap between rotor and pump body, the gap between rotor tooth top and tooth root, but also include the gap between the helical surfaces of the two rotors. The helical surface gap is determined by the relative position of the rotor shaft distance, the rotor axial and angular. Since the rotor is wrapped by the pump body, it is difficult to measure the gap. When installing the rotor, the traditional rotor helical surface gap adjustment method usually depends on the assembly process, which is easily affected by the experience of the operator, resulting in unstable performance of the pump. In the process of processing the helical surface of the rotor, although the angular reference surface and the axial reference surface are processed, after processing, in order to reduce the weight of the rotor, the part where the angular reference surface is located is cut off.

[0003] In order to improve the assembly reliability of screw vacuum pump, some improvement schemes have appeared in recent years, for example, first install the rotor into the simulation pump body with open side, then install a certain thickness of gasket between the rotor step surface and the end cover, and adjust the rotor gap by using multiple plug gauges (for example, if the gap is 10, the plug gauge of 10 can be inserted, and the plug gauge of 11 cannot be inserted), then lock the synchronous gear to control the rotor helical surface gap, and after the rotor is fixed, it needs to be removed from the simulation pump body and installed into the actual pump body. For related introduction of this method, please refer to CN115890562A-screw vacuum pump assembly tool and assembly method. Although the reliability is improved by using the simulation pump body and multiple plug gauges, the assembly process is relatively complicated. SUMMARY

[0004] The utility model provides a kind of screw vacuum pump rotor assembly structure for the deficiency that the gap between the helical surface of the two rotors of existing screw vacuum pump is adjusted complicatedly, realize fast and convenient installation while ensuring the relative position between the two rotors.

[0005] The utility model also provides a kind of screw vacuum pump rotor and screw vacuum pump rotor group.

[0006] To achieve the above object, the utility model adopts the following technical scheme: the screw vacuum pump rotor assembly structure comprises:

[0007] The first rotor comprises a first shaft part and a first helical part, and the first shaft part is formed with a first axial positioning surface and a first angular positioning surface;

[0008] The second rotor comprises a second shaft part and a second helical part, and the second shaft part is formed with a second axial positioning surface and a second angular positioning surface;

[0009] The positioning plate is provided with a first matching surface matched with the first angular positioning surface and a second matching surface matched with the second angular positioning surface, and the distance between the first matching surface and the second matching surface is adapted to the axial distance requirement between the first rotor and the second rotor, and the first matching surface and the second matching surface are parallel;

[0010] The end cover is provided with a radial surface matched with the first axial positioning surface and the second axial positioning surface;

[0011] When the first axial positioning surface and the second axial positioning surface coincide with the radial surface and the first angular positioning surface and the second angular positioning surface are parallel to the first matching surface and the second matching surface, the first helical part and the second helical part meet the axial, radial and angular requirements.

[0012] The screw vacuum pump rotor assembly structure of the utility model, the first rotor has a first axial positioning surface and a first angular positioning surface, the second rotor has a second axial positioning surface and a second angular positioning surface, the positioning plate has parallel first matching surface and second matching surface, the first matching surface is matched with the first angular positioning surface, the second matching surface is matched with the second angular positioning surface, and the distance between the first matching surface and the second matching surface is adapted to the axial distance requirement between the first rotor and the second rotor, so that when the first axial positioning surface and the second axial positioning surface coincide with the radial surface and the first angular positioning surface and the second angular positioning surface are parallel to the first matching surface and the second matching surface, the first helical part and the second helical part meet the axial, radial and angular requirements.

[0013] As an improvement, the first shaft part is further formed with a first foolproof surface, the second shaft part is further formed with a second foolproof surface, and the positioning plate is formed with a foolproof flat surface matched with the first foolproof surface and the second foolproof surface.

[0014] As an improvement, the first angular positioning surface comprises two parallel surfaces, and the second angular positioning surface comprises two parallel surfaces.

[0015] As an improvement, the first shaft portion and the second shaft portion are at least partially identical.

[0016] As an improvement, the first rotor is integrally formed.

[0017] As an improvement, a first threaded portion is formed outside the first axial positioning surface of the first rotor; a second threaded portion is formed outside the first axial positioning surface of the second rotor.

[0018] As an improvement, the first shaft portion comprises an optical axis segment and an axial positioning segment with a larger diameter than the optical axis segment, the axial positioning segment is located between the optical axis segment and the first helical portion, and an end surface of the axial positioning segment close to the optical axis segment forms the first axial positioning surface.

[0019] As an improvement, the first shaft portion further comprises an angle positioning segment with a larger diameter than the axial positioning segment, the angle positioning segment is located between the axial positioning segment and the first helical portion, and the first angle positioning surface is formed on the angle positioning segment.

[0020] As an improvement, the axial dimension of the first angle positioning surface is smaller than the axial dimension of the angle positioning segment, and the first angle positioning surface is axially close to the axial positioning segment.

[0021] A screw vacuum pump rotor, comprising:

[0022] a shaft portion;

[0023] a helical portion;

[0024] wherein an axial positioning surface and an angle positioning surface are formed on the shaft portion.

[0025] A screw vacuum pump rotor set, comprising:

[0026] a first rotor comprising a first shaft portion and a first helical portion, the first shaft portion forming a first axial positioning surface and a first angle positioning surface thereon;

[0027] a second rotor comprising a second shaft portion and a second helical portion, the second shaft portion forming a second axial positioning surface and a second angle positioning surface thereon;

[0028] wherein when the first axial positioning surface and the second axial positioning surface coincide and the first angle positioning surface and the second angle positioning surface are parallel, the first helical portion and the second helical portion meet the axial and angle requirements.

[0029] The screw vacuum pump rotor assembly structure of the utility model, first rotor has first axial locating surface and first angle locating surface, second rotor has second axial locating surface and second angle locating surface, locating plate has parallel first mating surface and second mating surface, first mating surface is matched with first angle locating surface, second mating surface is matched with second angle locating surface, the distance between first mating surface and second mating surface is adapted to the shaft distance requirement between first rotor and second rotor, so that when first axial locating surface, second axial locating surface coincide with radial surface and first angle locating surface and second angle locating surface are parallel to first mating surface and second mating surface, first helical part and second helical part meet axial, radial and angle requirements, thereby reducing assembly difficulty, improving assembly efficiency and ensuring assembly quality.

[0030] The screw vacuum pump rotor of the utility model, when applied to screw vacuum pump, can reduce assembly difficulty, improve assembly efficiency and ensure assembly quality.

[0031] The screw vacuum pump rotor group of the utility model, when applied to screw vacuum pump, can reduce assembly difficulty, improve assembly efficiency and ensure assembly quality. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is the structural schematic diagram of the screw vacuum pump rotor assembly structure of the utility model embodiment one.

[0033] Figure 2 It is the structural schematic diagram of the first rotor of the screw vacuum pump rotor assembly structure of the utility model embodiment one.

[0034] Figure 3 It is the structural schematic diagram of the locating plate of the screw vacuum pump rotor assembly structure of the utility model embodiment one.

[0035] Figure 4 It is the structural schematic diagram (also shows end cover etc.) of the screw vacuum pump rotor assembly structure of the utility model embodiment one.

[0036] Figure 5 It is Figure 4 The sectional view of

[0037] 1, first rotor;11, first shaft part;111, optical axis section;112, axial locating section;113, angle locating section;114, first axial locating surface;115, first angle locating surface;116, first fool-proof surface;117, first threaded part;12, first helical part;

[0038] 2, second rotor;21, second axial locating surface;22, second angle locating surface;23, second fool-proof surface;24, second threaded part;

[0039] 3, positioning plate; 31, first matching surface; 32, second matching surface; 33, foolproof plane;

[0040] 4, end cover; 41, radial surface;

[0041] 5, nut. DETAILED DESCRIPTION

[0042] The technical solutions of the embodiments of the application are explained and described below, but the following embodiments are only preferred embodiments of the application, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0043] Referring to Figures 1 to 5 The screw vacuum pump rotor assembly structure of the utility model, the screw vacuum pump rotor assembly structure includes:

[0044] The first rotor includes a first shaft part and a first spiral part, and a first axial positioning surface and a first angle positioning surface are formed on the first shaft part;

[0045] The second rotor includes a second shaft part and a second spiral part, and a second axial positioning surface and a second angle positioning surface are formed on the second shaft part;

[0046] The positioning plate has a first matching surface matched with the first angle positioning surface and a second matching surface matched with the second angle positioning surface, and the distance between the first matching surface and the second matching surface is matched with the shaft distance requirement between the first rotor and the second rotor, and the first matching surface and the second matching surface are parallel;

[0047] The end cover has a radial surface matched with the first axial positioning surface and the second axial positioning surface;

[0048] When the first axial positioning surface, the second axial positioning surface and the radial surface coincide and the first angle positioning surface and the second angle positioning surface are parallel to the first matching surface and the second matching surface, the first spiral part and the second spiral part meet the axial, radial and angle requirements.

[0049] The screw vacuum pump rotor assembly structure of the utility model, the first rotor has a first axial positioning surface and a first angle positioning surface, the second rotor has a second axial positioning surface and a second angle positioning surface, the positioning plate has parallel first matching surface and second matching surface, the first matching surface is matched with the first angle positioning surface, the second matching surface is matched with the second angle positioning surface, and the distance between the first matching surface and the second matching surface is matched with the shaft distance requirement between the first rotor and the second rotor, so that when the first axial positioning surface, the second axial positioning surface and the radial surface coincide and the first angle positioning surface and the second angle positioning surface are parallel to the first matching surface and the second matching surface, the first spiral part and the second spiral part meet the axial, radial and angle requirements.

[0050] Embodiment one

[0051] Referring to Figures 1 to 5 The screw vacuum pump rotor assembly structure of the utility model one comprises:

[0052] The first rotor 1 comprises a first shaft part 11 and a first spiral part 12, and the first shaft part 11 is formed with a first axial positioning surface 114 and a first angle positioning surface 115;

[0053] The second rotor 2 comprises a second shaft part and a second spiral part, and the second shaft part is formed with a second axial positioning surface 21 and a second angle positioning surface 22;

[0054] The positioning plate 3 is provided with a first matching surface 31 matched with the first angle positioning surface 115 and a second matching surface 32 matched with the second angle positioning surface 22, and the distance between the first matching surface 31 and the second matching surface 32 is matched with the shaft distance requirement between the first rotor 1 and the second rotor 2, and the first matching surface 31 and the second matching surface 32 are parallel;

[0055] The end cover 4 is provided with a radial surface 41 matched with the first axial positioning surface 114 and the second axial positioning surface 21;

[0056] When the first axial positioning surface 114, the second axial positioning surface 21 and the radial surface 41 are coincident and the first angle positioning surface 115 and the second angle positioning surface 22 are parallel to the first matching surface 31 and the second matching surface 32, the first spiral part 12 and the second spiral part meet the axial, radial and angle requirements.

[0057] In the embodiment, the structures of the first rotor 1 and the second rotor 2 are basically the same except the spiral parts.

[0058] In the embodiment, the first shaft part 11 is further formed with a first foolproof surface 116, the second shaft part is further formed with a second foolproof surface 23, and the positioning plate 3 is formed with a foolproof surface 33 matched with the first foolproof surface 116 and the second foolproof surface 23. When the foolproof surfaces are not arranged, it is more difficult to engage the first rotor 1 and the second rotor 2. After the foolproof surfaces are arranged, the two foolproof surfaces are in the same direction, so that the two rotors can be quickly positioned and engaged.

[0059] In the embodiment, the first angle positioning surface 115 comprises two parallel surfaces; and the second angle positioning surface 22 comprises two parallel surfaces.

[0060] In the embodiment, the first rotor 1 is integrally formed; and the second rotor 2 is integrally formed. In other embodiments, the first rotor 1 can also be an assembly, and the second rotor 2 can also be an assembly.

[0061] In the embodiment, the first threaded portion 117 is formed outside the first axial positioning surface 114 of the first rotor 1, and the second threaded portion 24 is formed outside the first axial positioning surface 114 of the second rotor 2.

[0062] In the embodiment, the first shaft portion 11 comprises an optical axis segment 111 and an axial positioning segment 112 with a diameter larger than that of the optical axis segment 111, and the axial positioning segment 112 is located between the optical axis segment 111 and the first helical portion 12. An end surface of the axial positioning segment 112 close to the optical axis segment 111 forms the first axial positioning surface 114.

[0063] In the embodiment, the first shaft portion 11 further comprises an angle positioning segment 113 with a diameter larger than that of the axial positioning segment 112, and the angle positioning segment 113 is located between the axial positioning segment 112 and the first helical portion 12. The first angle positioning surface 115 is formed on the angle positioning segment 113.

[0064] In the embodiment, the axial dimension of the first angle positioning surface 115 is smaller than that of the angle positioning segment 113, and the first angle positioning surface 115 is axially close to the axial positioning segment 112.

[0065] In the embodiment, during the machining of the pair of rotors, the first angle positioning surface 115 and the first axial positioning surface 114 of the first rotor 1 both serve as positioning reference surfaces for machining the first helical portion 12, and the second angle positioning surface 22 and the second axial positioning surface 21 of the second rotor 2 both serve as positioning reference surfaces for machining the second helical portion.

[0066] In the embodiment, the process of assembling the pair of rotors of the screw vacuum pump is as follows: first, roughly engage the first rotor 1 and the second rotor 2, and make the first foolproof surface 116 of the first rotor 1 and the second foolproof surface 23 of the second rotor 2 on the top and roughly horizontal. At this time, the first angle positioning surface 115 of the first rotor 1 and the second angle positioning surface 22 of the second rotor 2 are roughly vertical. Then, the first matching surface 31 and the second matching surface 32 of the positioning plate 3 are respectively attached to the first angle positioning surface 115 and the second angle positioning surface 22 (at this time, the first rotor 1 and the second rotor 2 have been engaged), the foolproof plane 33 of the positioning plate 3 is attached to the first foolproof surface 116 and the second foolproof surface 23, and the two rotors after engagement are attached to the radial surface 41 of the end cover 4 through the first axial positioning surface 114 and the second axial positioning surface 21, and are locked by the nuts 5. At this time, the rotor is axially and angularly fixed, and the helical surface assembly gap is consistent with the design gap.

[0067] The screw vacuum pump rotor assembly structure of the embodiment of the utility model, the first rotor 1 has the first axial positioning surface 114 and the first angle positioning surface 115, the second rotor 2 has the second axial positioning surface 21 and the second angle positioning surface 22, the positioning plate 3 has the parallel first matching surface 31 and the second matching surface 32, the first matching surface 31 is matched with the first angle positioning surface 115, the second matching surface 32 is matched with the second angle positioning surface 22, the distance between the first matching surface 31 and the second matching surface 32 is adapted to the shaft distance requirement between the first rotor 1 and the second rotor 2, so that when the first axial positioning surface 114, the second axial positioning surface 21 coincide with the radial surface 41 and the first angle positioning surface 115 and the second angle positioning surface 22 are parallel to the first matching surface 31 and the second matching surface 32, the first helical part 12 and the second helical part meet the axial, radial and angle requirements, so that the assembly difficulty is reduced, the assembly efficiency is improved and the assembly quality is guaranteed.

[0068] The utility model embodiment provides a kind of screw vacuum pump rotor, and the screw vacuum pump rotor includes:

[0069] shaft portion;

[0070] helical portion;

[0071] Wherein, axial positioning surface and angle positioning surface are formed on shaft portion.

[0072] The utility model embodiment provides a kind of screw vacuum pump rotor set, and the screw vacuum pump rotor set includes:

[0073] first rotor 1, including first shaft portion 11 and first helical portion 12, first axial positioning surface 114 and first angle positioning surface 115 are formed on first shaft portion 11;

[0074] second rotor 2, including second shaft portion and second helical portion, second axial positioning surface 21 and second angle positioning are formed on second shaft portion;

[0075] Wherein, when first axial positioning surface 114 and second axial positioning surface 21 coincide and first angle positioning surface 115 and second angle positioning surface 22 are parallel, first helical portion 12 and second helical portion meet axial and angle requirements.

[0076] The above-mentioned, only for the specific embodiment of the present application, but the protection scope of the present application is not limited to this, the skilled in the art should understand that the present application includes but is not limited to the content described in above specific embodiment. Any modification that does not deviate from the function and structural principle of the present application will be included in the scope of claims.

Claims

1. A screw vacuum pump rotor assembly structure, characterized in that: The rotor assembly structure of the screw vacuum pump includes: The first rotor (1) includes a first shaft portion (11) and a first helical portion (12), and a first axial positioning surface (114) and a first angular positioning surface (115) are formed on the first shaft portion (11); The second rotor (2) includes a second shaft portion and a second helical portion, and a second axial positioning surface (21) and a second angular positioning surface (22) are formed on the second shaft portion; The positioning plate (3) has a first mating surface (31) that mates with the first angle positioning surface (115) and a second mating surface (32) that mates with the second angle positioning surface (22). The distance between the first mating surface (31) and the second mating surface (32) is adapted to the wheelbase requirement between the first rotor (1) and the second rotor (2). The first mating surface (31) and the second mating surface (32) are parallel. The end cap (4) has a radial surface (41) that mates with the first axial positioning surface (114) and the second axial positioning surface (21); When the first axial positioning surface (114), the second axial positioning surface (21) coincide with the radial surface (41) and the first angular positioning surface (115) and the second angular positioning surface (22) are parallel to the first mating surface (31) and the second mating surface (32), the first helical part (12) and the second helical part satisfy the axial, radial and angular requirements.

2. The screw vacuum pump rotor assembly structure according to claim 1, characterized in that: A first anti-foolproof surface (116) is also formed on the first shaft portion (11), a second anti-foolproof surface (23) is also formed on the second shaft portion, and an anti-foolproof surface (33) that cooperates with the first anti-foolproof surface (116) and the second anti-foolproof surface (23) is formed on the positioning plate (3).

3. The screw vacuum pump rotor assembly structure according to claim 1, characterized in that: The first angular positioning surface (115) includes two parallel surfaces; the second angular positioning surface (22) includes two parallel surfaces.

4. The screw vacuum pump rotor assembly structure according to claim 1, characterized in that: The first shaft portion (11) and the second shaft portion are at least partially identical; and / or, The first rotor (1) is integrally formed.

5. The screw vacuum pump rotor assembly structure according to claim 1, characterized in that: A first threaded portion (117) is formed on the outer side of the first axial positioning surface (114) of the first rotor (1); a second threaded portion (24) is formed on the outer side of the first axial positioning surface (114) of the second rotor (2).

6. The screw vacuum pump rotor assembly structure according to claim 1, characterized in that: The first shaft portion (11) includes an optical axis section (111) and an axial positioning section (112) with a diameter larger than that of the optical axis section (111). The axial positioning section (112) is located between the optical axis section (111) and the first spiral portion (12). The end face of the axial positioning section (112) near the optical axis section (111) forms a first axial positioning surface (114).

7. The screw vacuum pump rotor assembly structure according to claim 6, characterized in that: The first shaft portion (11) also includes an angle positioning portion (113) with a diameter greater than that of the axial positioning portion (112). The angle positioning portion (113) is located between the axial positioning portion (112) and the first spiral portion (12), and a first angle positioning surface (115) is formed on the angle positioning portion (113).

8. The screw vacuum pump rotor assembly structure according to claim 7, characterized in that: The axial dimension of the first angular positioning surface (115) is smaller than the axial dimension of the angular positioning segment (113), and the first angular positioning surface (115) is axially close to the axial positioning segment (112).

9. A screw vacuum pump rotor, characterized in that: The rotor of the screw vacuum pump includes: Shaft portion; Spiral part; The shaft portion has an axial positioning surface and an angular positioning surface.

10. A screw vacuum pump rotor assembly, characterized in that: The screw vacuum pump rotor assembly includes: The first rotor (1) includes a first shaft portion (11) and a first helical portion (12), and a first axial positioning surface (114) and a first angular positioning surface (115) are formed on the first shaft portion (11); The second rotor (2) includes a second shaft portion and a second helical portion, wherein a second axial positioning surface (21) and a second angular positioning surface are formed on the second shaft portion; When the first axial positioning surface (114) and the second axial positioning surface (21) coincide and the first angular positioning surface (115) and the second angular positioning surface (22) are parallel, the first helical part (12) and the second helical part satisfy the axial and angular requirements.

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