Rotor assembly and pump body
By designing a rotor assembly composed of multiple arc connections, the problem of too large or too small gap in the Roots vacuum pump is solved, and the pumping rate and service life are improved.
Patent Information
- Application Number
- CN202421446280.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-21
AI Technical Summary
The gap between the rotors and between the rotors and the pump body of the existing Rots vacuum pump is too large or too small, resulting in low pumping speed efficiency or insufficient service life.
A rotor assembly is designed, including a first rotor group and a second rotor group, and each impeller profile consists of multiple arc connections to ensure a smaller time gap during rotation.
By reducing the gap, the air extraction rate is improved, wear is reduced, and service life is extended.
Smart Images
Figure CN222596304U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pumps, in particular to a rotor assembly and a pump body. Background Art
[0002] A Roots vacuum pump is a variable displacement vacuum pump that has two blade-shaped rotors rotating synchronously in opposite directions, with a small gap between the rotors and between the rotors and the inner wall of the pump casing, but they do not touch each other. It is mainly used for vacuum extraction, etc. In the relevant technology, if the gap between the rotors of the existing Roots vacuum pumps and the gap between the rotors and the pump body are too large or too small, it is easy to cause low pumping efficiency or wear and tear, resulting in insufficient service life. Utility Model Content
[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the utility model is to provide a rotor assembly, which is applied to the rotor cavity of a pump body, and the rotor assembly comprises:
[0004] A first rotor assembly, the first rotor assembly is disposed in the rotor cavity and is rotatable about its own axis toward a first direction;
[0005] A second rotor group, wherein the second rotor group is arranged in the rotor cavity and is rotatable around its own axis toward a second direction, the axis of the first rotor group is parallel to the axis of the second rotor group, and the first direction is opposite to the second direction; wherein each blade profile of the first rotor group is composed of at least six circular arcs, and each blade profile of the second rotor group is composed of at least seven circular arcs.
[0006] Preferably, the first rotor assembly comprises:
[0007] a first rotating shaft, the first rotating shaft being rotatably connected to the pump housing;
[0008] The multi-stage first rotors are arranged at intervals along the axial direction of the first rotating shaft, and the intervals between the multi-stage first rotors are preset distances.
[0009] Preferably, the second rotor assembly comprises:
[0010] a second rotating shaft, the second rotating shaft being rotatably connected to the pump housing;
[0011] The multi-stage second rotor is arranged at intervals along the axial direction of the second rotating shaft and meshes with the multi-stage first rotor.
[0012] Preferably, the multi-stage first rotor and the multi-stage second rotor are both composed of three-leaf profiles.
[0013] Preferably, each blade profile of the multi-stage first rotor has a first transition arc segment a, a first transition arc segment b, a first transition arc segment c, a first transition arc segment d, a first transition arc segment e, a first transition arc segment f and a first transition arc segment g which are connected in sequence, the curvature of the first transition arc segment a is the same as the curvature of the seventh transition arc segment g, and the curvature of the second transition arc segment b is the same as the curvature of the first transition arc segment f.
[0014] Preferably, the curvature of the first transition arc segment c is R58.8, the curvature of the first transition arc segment d is R31.7, and the curvature of the first transition arc segment e is R49.79.
[0015] Preferably, each blade profile of the multi-stage second rotor has a second transition arc segment a, a second transition arc segment b, a second transition arc segment c, a second transition arc segment d, a second transition arc segment e and a second transition arc segment f which are connected in sequence, and the curvature of the first transition arc segment a is the same as the curvature of the second transition arc segment f.
[0016] Preferably, the multi-stage first rotor and the multi-stage second rotor form at least five stages, and a preset interval is formed between each stage of the rotor.
[0017] Another object of the present invention is to provide a pump body, comprising the rotor assembly as described above.
[0018] The above solution of the utility model includes at least the following beneficial effects:
[0019] The rotor assembly provided by the utility model sets the profile of each blade of the first rotor group to be composed of at least six connected arc segments, and sets the profile of each blade of the second rotor group to be composed of at least seven connected arc segments, so that when the first rotor group and the second rotor group rotate, the gap between the first rotor group and the second rotor group and the gap with the pump body are smaller, thereby improving the pumping rate, reducing wear and increasing service life.
[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0022] Figure 1It is a structural schematic diagram of a rotor assembly provided in an embodiment of the utility model;
[0023] Figure 2 is a structural schematic diagram of a first rotor assembly provided in an embodiment of the utility model;
[0024] Figure 3 is a structural schematic diagram of a second rotor assembly provided in an embodiment of the utility model;
[0025] Description of Figure Numbers:
[0026] 10. First rotor group; 11. First rotating shaft; 12. Multi-stage first rotor; 121. First transition arc segment a; 122. First transition arc segment b; 123. First transition arc segment c; 124. First transition arc segment d; 125. First transition arc segment e; 126. First transition arc segment f; 127. First transition arc segment g; 20. Second rotor group; 21. Second rotating shaft; 22. Multi-stage second rotor; 221. Second transition arc segment a; 222. Second transition arc segment b; 223. Second transition arc segment c; 224. Second transition arc segment d; 225. Second transition arc segment e; 226. Second transition arc segment f; R10. Connecting arc segment.
[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0028] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.
[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0033] The rotor assembly and the pump body of the embodiment of the utility model are described in detail below with reference to the accompanying drawings.
[0034] Reference Figures 1 to 3 As shown, the rotor assembly provided by the utility model is applied to the rotor cavity of the pump body, and the rotor assembly includes: a first rotor group 10 and a second rotor group 20, the first rotor group 10 is arranged in the rotor cavity and can rotate around its own axis toward a first direction; the second rotor group 20 is arranged in the rotor cavity and can rotate around its own axis toward a second direction, the axis of the first rotor group 10 and the axis of the second rotor group 20 are parallel to each other, and the first direction and the second direction are opposite; wherein, each blade profile of the first rotor group 10 is composed of at least six circular arcs connected, and each blade profile of the second rotor group 20 is composed of at least seven circular arcs connected.
[0035] The rotor assembly provided by the utility model sets the profile of each blade of the first rotor group 10 to be composed of at least six connected arc segments, and sets the profile of each blade of the second rotor group 20 to be composed of at least seven connected arc segments, so that when the first rotor group 10 and the second rotor group 20 rotate, the gap between the first rotor group 10 and the second rotor group 20 and the gap with the pump body are smaller, thereby improving the pumping rate, reducing wear and increasing service life.
[0036] Specifically, the first rotor group 10 includes: a first rotating shaft 11 and a multi-stage first rotor 12, the first rotating shaft 11 is rotatably connected to the pump casing; the multi-stage first rotor 12 is arranged at intervals along the axial direction of the first rotating shaft 11, and the spacing between the multi-stage first rotors 12 is a preset distance; further, the second rotor group 20 includes: a second rotating shaft 21 and a multi-stage second rotor 22, the second rotating shaft 21 is rotatably connected to the pump casing; the multi-stage second rotor 22 is arranged at intervals along the axial direction of the second rotating shaft 21, and meshes with the multi-stage first rotor 12.
[0037] Among them, the multi-stage first rotor 12 and the multi-stage second rotor 22 form at least five stages, and a preset spacing is formed between each rotor, which can be 20.5 mm. The distance between the multi-stage second rotors 22 can also be a preset distance, so that the multi-stage first rotor 12 and the multi-stage second rotor 22 can cooperate to pump the gas when they rotate. It can be understood that the multi-stage first rotor 12 and the multi-stage second rotor 22 can form at least five stages, and can be gradually increased step by step along the axial direction, and a plurality of gas chambers are separated in the accommodating cavity to accommodate the multi-stage first rotor 12 and the multi-stage second rotor 22. The plurality of gas chambers can be connected through the airflow channel, thereby pumping the gas through the multi-stage first rotor 12 and the multi-stage second rotor 22, thereby improving the overall pumping rate.
[0038] Specifically, each blade profile of the multi-stage first rotor 12 has a first transition arc segment a121, a first transition arc segment b122, a first transition arc segment c123, a first transition arc segment d124, a first transition arc segment e125, a first transition arc segment f126 and a first transition arc segment g127 which are connected in sequence, the curvature of the first transition arc segment a121 is the same as the curvature of the seventh transition arc segment g, and the curvature of the second transition arc segment b222 is the same as the curvature of the first transition arc segment f126.
[0039] In this embodiment, the curvature of the first transition arc segment c123 is R58.8, the curvature of the first transition arc segment d124 is R31.7, the curvature of the first transition arc segment e125 is R49.79, and the connecting arc segment R10 between two adjacent leaf contours is R32.1. When the multi-stage first rotor 12 and the multi-stage second rotor 22 rotate, the first transition arc segment d124 rotates into between the two adjacent leaf contours and is opposite to the connecting arc segment R10, so that the gap between the first transition arc segment and the connecting arc segment R10 is smaller, thereby reducing the impact of the gas between the multi-stage first rotor 12 and the multi-stage second rotor 22, thereby ensuring better overall stability.
[0040] Specifically, each blade profile of the multi-stage second rotor 22 has a second transition arc segment a221, a second transition arc segment b222, a second transition arc segment c223, a second transition arc segment d224, a second transition arc segment e225 and a second transition arc segment f226 connected in sequence, and the curvature of the first transition arc segment a121 is the same as the curvature of the second transition arc segment f226.
[0041] In this embodiment, the curvature of the second transition arc segment a221 and the second transition arc segment f226 is R11, the curvature of the second transition arc segment b222 is R33.9, the curvature of the second transition arc segment c223 is R58.8, the curvature of the second transition arc segment d224 is R31.7, the curvature of the second transition arc segment e225 is R49.76, and the connecting arc segment R10 between two adjacent leaf contours is R32.1. It can be understood that when the multi-stage first rotor 12 and the multi-stage second rotor 22 rotate, the first transition arc segment d124 forms a certain gap with the connecting arc segment R10 of the multi-stage second rotor 22, and the second transition arc segment d224 forms a certain gap with the connecting arc segment R10 of the multi-stage first rotor 12, thereby making the exhaust rate higher during rotation.
[0042] The pump body provided in the embodiment of the utility model comprises the rotor assembly as described above. The pump body is configured by setting each blade profile of the first rotor group 10 to be connected to form at least six arc segments, and setting each blade profile of the second rotor group 20 to be connected to form at least seven arc segments, so that when the first rotor group 10 and the second rotor group 20 rotate, the gap between the first rotor group 10 and the second rotor group 20 and the gap with the pump body are smaller, thereby improving the pumping rate, reducing wear and increasing the service life.
[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0044] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.
Claims
1. A rotor assembly, characterized in that: Applied in the rotor cavity of a pump body, the rotor assembly comprises: A first rotor assembly, the first rotor assembly is disposed in the rotor cavity and is rotatable about its own axis toward a first direction; A second rotor group, wherein the second rotor group is arranged in the rotor cavity and is rotatable around its own axis toward a second direction, the axis of the first rotor group is parallel to the axis of the second rotor group, and the first direction is opposite to the second direction; wherein each blade profile of the first rotor group is composed of at least six circular arcs, and each blade profile of the second rotor group is composed of at least seven circular arcs.
2. The rotor assembly according to claim 1, characterized in that: The first rotor assembly comprises: a first rotating shaft, the first rotating shaft being rotatably connected to the pump housing; The multi-stage first rotors are arranged at intervals along the axial direction of the first rotating shaft, and the intervals between the multi-stage first rotors are preset distances.
3. The rotor assembly according to claim 2, characterized in that: The second rotor assembly comprises: a second rotating shaft, the second rotating shaft being rotatably connected to the pump housing; The multi-stage second rotor is arranged at intervals along the axial direction of the second rotating shaft and meshes with the multi-stage first rotor.
4. The rotor assembly according to claim 3, characterized in that: The multi-stage first rotor and the multi-stage second rotor are both composed of three-leaf profiles.
5. The rotor assembly according to claim 4, characterized in that: Each blade profile of the multi-stage first rotor has a first transition arc segment a, a first transition arc segment b, a first transition arc segment c, a first transition arc segment d, a first transition arc segment e, a first transition arc segment f and a first transition arc segment g connected in sequence, the curvature of the first transition arc segment a is the same as the curvature of the first transition arc segment g, and the curvature of the first transition arc segment b is the same as the curvature of the first transition arc segment f.
6. The rotor assembly according to claim 5, characterized in that The radian of the first transition arc segment c is R58.8, the radian of the first transition arc segment d is R31.7, and the radian of the first transition arc segment e is R49.
79.
7. The rotor assembly according to claim 4, characterized in that Each blade profile of the multi-stage second rotor has a second transition arc segment a, a second transition arc segment b, a second transition arc segment c, a second transition arc segment d, a second transition arc segment e and a second transition arc segment f which are connected in sequence, and the curvature of the second transition arc segment a is the same as the curvature of the second transition arc segment f.
8. The rotor assembly according to claim 3, characterized in that: The multi-stage first rotor and the multi-stage second rotor form at least five stages, and a preset interval is formed between each stage of the rotor.
9. A pump body, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 8.