Pump cover, pump chamber and vacuum pump

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By designing a part of the pump chamber formed on the pump cover, the pump cover and the pump body share the depth of the pump chamber, solving the problem of processing difficulty caused by the depth of the pump chamber in the screw vacuum pump, and achieving a shorter pump chamber depth and a larger depth of the pump chamber.

CN222596300UActive Publication Date: 2025-03-11ZHEJIANG VALUE MECHANICAL & ELECTRICAL PROD CO LTD

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Patent Information

Application Number: CN202420499066.9
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-03-14
Publication Date: 2025-03-11
Estimated Expiration: 2034-03-14

AI Technical Summary

Technical Problem

In screw vacuum pumps, the processing of the pump body is more difficult when the pump chamber is deep, and the prior art is difficult to ensure the processing accuracy of the pump chamber.

Method used

A pump cover is designed on which a part of the pump chamber is formed, and the pump cover and the pump body share the depth of the entire pump chamber, so that the depth of the pump chamber on the pump body can be shorter, thereby reducing the difficulty of processing of the pump body.

Benefits of technology

Through the reasonable distribution of the pump cover and pump chamber, the processing difficulty of the pump body is significantly reduced, or a pump chamber with a greater depth is obtained when the processing difficulty remains unchanged.

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Abstract

The utility model belongs to the technical field of vacuum pumps, and particularly relates to a pump cover, a pump cavity and a vacuum pump. In order to overcome the defects that a pump cavity of a screw vacuum pump and the like is completely formed on a pump body, a pump cover does not form the pump cavity, and the machining difficulty of the pump body is large when the pump cavity is deep, the following technical scheme is adopted: the pump cover comprises a cover base part provided with a shaft hole; and the cover pump cavity part is formed by axially extending from one axial end of the shaft hole of the cover base part and is provided with a cover pump cavity communicated with the shaft hole. The pump cover has the advantages that a part of the pump cavity is formed on the pump cover, the depth of the whole pump cavity is shared by the pump cover and the pump body, the depth of the pump cavity on the pump body can be shorter through reasonable distribution of the whole pump cavity by the pump cover and the pump cavity, and therefore the machining difficulty of the pump body is remarkably reduced, or the machining cost is reduced. And a pump cavity with a larger depth is obtained when the machining difficulty of the pump body is not changed.

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Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum pumps, and in particular relates to a pump cover, a pump chamber and a vacuum pump. Background Art

[0002] The main structure of a screw vacuum pump consists of two counter-rotating meshing screw rotors within a pump body. The primary difficulty in machining these parts lies in ensuring the internal clearance between the screw rotors and the pump body. The cylindricity and diameter accuracy of the pump body's internal bore are both affected by the pump body's structure and length. Currently, the mainstream constructions of screw vacuum pumps are either one-end open and a pump cover, or two-end open and two-end covers. The former offers the advantages of a compact structure and a reduced number of parts, while the latter boasts an open pump cavity, fewer casting defects, and easier machining.

[0003] The higher the pumping speed required for a screw vacuum pump, the higher the energy savings and vacuum requirements, and the more stages the screw rotor requires. The more stages, the longer the rotor, and the deeper the pump cavity. The deeper the pump cavity, the more difficult it is to ensure machining accuracy. Existing screw vacuum pumps have the pump cavity entirely formed in the pump body, with no pump cavity formed in the pump cover. This makes machining the pump body more difficult when the pump cavity is deep. Summary of the Invention

[0004] The present invention addresses the drawbacks of screw vacuum pumps, such as pump chambers formed entirely on the pump body, with no pump chamber formed on the pump cover. This makes machining the pump body more difficult when the pump chamber is deep. The present invention provides a pump cover on which a portion of the pump chamber is formed. The pump cover and the pump body share the depth of the entire pump chamber, allowing the depth of the pump chamber on the pump body to be shorter, thereby significantly reducing the machining difficulty of the pump body or achieving a deeper pump chamber while maintaining the same machining difficulty. The present invention also provides a pump chamber and a vacuum pump.

[0005] To achieve the above purpose, the present invention adopts the following technical solution: a pump cover, the pump cover comprising:

[0006] The base of the cover is provided with an axis hole;

[0007] The cover pump chamber portion is formed by axially extending from one axial end of the axial hole of the cover base portion and has a cover pump chamber communicated with the axial hole.

[0008] The pump cover of the utility model includes a cover base and a cover pump chamber portion, the cover pump chamber portion is formed by axially extending from one end of the axial hole of the cover base, the cover pump chamber portion has a cover pump chamber connected with the axial hole, a part of the complete pump chamber is formed on the pump cover, the pump cover and the pump body share the depth of the entire pump chamber, and the reasonable distribution of the entire pump chamber by the pump cover and the pump chamber can make the depth of the pump chamber on the pump body shorter, thereby significantly reducing the processing difficulty of the pump body (the increase in the processing difficulty of the pump cover is very small), or, when the processing difficulty of the pump body remains unchanged, a pump chamber with a larger depth is obtained.

[0009] As an improvement, the ratio of the axial dimensions of the cover pump cavity and the cover base is 1:1-5:1.

[0010] As an improvement, an air inlet hole is provided on the upper portion of the pump cover, and the air inlet hole is directly connected vertically to the cover pump chamber.

[0011] As an improvement, an air inlet hole is opened on the upper part of the pump body, and the air inlet hole is located at the junction of the cover base and the pump cover cavity. The radial dimension of the air inlet hole located at the cover pump cavity is not less than the radial dimension of the air inlet hole located at the pump cover.

[0012] As an improvement, the ratio of the radial dimension of the air inlet hole located at the cover pump cavity portion to the radial dimension of the air inlet hole located at the cover base portion is 1:1-4:1.

[0013] As an improvement, a connecting hole portion is formed on the end surface of the cover pump cavity away from the cover base.

[0014] The pump chamber comprises a pump body and a pump cover, wherein the pump cover is the aforementioned pump cover, and the pump body forms a main pump chamber which is coaxially communicated with the axial hole of the cover pump chamber portion.

[0015] As an improvement to the pump chamber, the ratio of the axial length of the main pump chamber of the pump body to the axial length of the cover pump chamber of the pump cover is 1:1-3:1.

[0016] The vacuum pump comprises a pump chamber, the pump chamber comprises a pump body and a pump cover, the pump cover is the aforementioned pump cover, and the pump body forms a main pump chamber which is coaxially connected to the axial hole of the cover pump chamber.

[0017] As an improvement of the vacuum pump, the vacuum pump is a screw vacuum pump, the base of the cover is provided with two parallel through-going axial holes, and the pump chamber is provided with two screw rotors.

[0018] The beneficial effect of the pump cover of the present invention is that a part of the pump cavity is formed on the pump cover, and the pump cover and the pump body share the depth of the entire pump cavity. Through the reasonable distribution of the entire pump cavity by the pump cover and the pump cavity, the depth of the pump cavity on the pump body can be shorter, thereby significantly reducing the processing difficulty of the pump body, or, when the processing difficulty of the pump body remains unchanged, a pump cavity with a larger depth is obtained.

[0019] The pump chamber and vacuum pump of the utility model adopt the pump cover of the utility model and have all the beneficial effects of the pump cover of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of an existing pump chamber.

[0021] Figure 2 and Figure 3 It is a schematic diagram of the structure of the existing pump cover at different angles.

[0022] Figure 4 yes Figure 3 Cross-sectional view along the AA axis.

[0023] Figure 5 It is a structural schematic diagram of the pump chamber of the first embodiment of the present utility model.

[0024] Figure 6 and Figure 7 It is a schematic structural diagram of the pump cover of the first embodiment of the present invention at different angles.

[0025] Figure 8 yes Figure 7 Cross-sectional view along the BB direction.

[0026] Figure 9 yes Figure 7 Cross-sectional view along CC direction.

[0027] In the figure, 1, pump cover; 11, cover base; 111, shaft hole; 12, cover pump chamber; 121, cover pump chamber; 13, air inlet;

[0028] 2. Pump body. DETAILED DESCRIPTION

[0029] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0030] See also Figures 5 to 9 The pump cover of the embodiment of the utility model comprises:

[0031] The base of the cover is provided with an axis hole;

[0032] The cover pump chamber portion is formed by axially extending from one axial end of the axial hole of the cover base portion and has a cover pump chamber communicated with the axial hole.

[0033] contrast Figures 1 to 4 The existing pump chamber and its pump body and pump cover in the utility model, the pump cover of the utility model includes a cover base and a cover pump chamber part, the cover pump chamber part is formed by axially extending from one end of the axial hole of the cover base, the cover pump chamber part has a cover pump chamber connected with the axial hole, a part of the pump chamber is formed on the pump cover, the pump cover and the pump body share the depth of the entire pump chamber, and the reasonable distribution of the entire pump chamber by the pump cover and the pump chamber can make the depth of the pump chamber on the pump body shorter, thereby significantly reducing the processing difficulty of the pump body (the increase in the processing difficulty of the pump cover is very small), or, a pump chamber with a larger depth is obtained when the processing difficulty of the pump body remains unchanged.

[0034] Example 1 of the pump chamber

[0035] See also Figures 5 to 9 The pump chamber of the first embodiment of the present invention includes a pump body 2 and a pump cover 1, and the pump cover 1 includes:

[0036] The cover base 11 is provided with an axial hole 111;

[0037] The cover pump chamber portion 12 is formed by axially extending from one axial end of the axial hole 111 of the cover base 11 and having a cover pump chamber 121 communicating with the axial hole 111;

[0038] The pump body 2 forms a main pump chamber that is coaxially connected to the axial hole 111 of the cover pump chamber portion 12 .

[0039] contrast Figure 4 The existing pump cover 1 and Figure 9 It can be seen that the existing pump cover 1 only has a cover base 11 and does not have a cover pump cavity 12.

[0040] See also Figure 8 In this embodiment, the upper portion of the pump cover 1 is provided with an air inlet 13, and the air inlet 13 is vertically and directly connected to the cover pump cavity 121. Figure 4 The existing pump cover 1 and Figure 9 It can be seen that when the existing pump cover 1 takes in air, the gas flows vertically downward from the air inlet hole 13 and needs to turn before reaching the pump chamber. In this embodiment, the gas flows vertically downward from the air inlet hole 13 and directly reaches the pump chamber. The gas path length is shorter and there are fewer turns.

[0041] In this embodiment, the air inlet 13 is located at the junction of the cover base 11 and the cavity of the pump cover 1 , and the radial dimension of the air inlet 13 located at the cover pump cavity 12 is not less than the radial dimension of the air inlet 13 located at the pump cover 1 .

[0042] In this embodiment, the ratio of the radial dimension of the air inlet hole 13 located at the cover pump cavity 12 to the radial dimension of the air inlet hole 13 located at the cover base 11 is 1:1-4:1.

[0043] In this embodiment, a connection hole portion is formed on the end surface of the cover pump cavity portion 12 away from the cover base portion 11 .

[0044] In this embodiment, the ratio of the axial length of the main pump cavity of the pump body 2 to the axial length of the cover pump cavity 121 of the pump cover 1 is 1:1-3:1. When the axial length of the main pump cavity of the pump body 2 is equal to the axial length of the cover pump cavity 121, the pump cavities of the pump body 2 and the pump cover 1 are equally difficult to manufacture. In this case, the deepest pump cavity can be obtained under existing processing conditions. Typically, the axial length, i.e., the depth, of the main pump cavity of the pump body 2 is greater than the axial length, i.e., the depth, of the cover pump cavity 121 of the pump cover 1.

[0045] See also Figure 9In this embodiment, the ratio of the axial dimensions of the cover pump cavity 12 and the cover base 11 is 1:1-5:1.

[0046] More specifically, compare Figures 1 to 4 The existing pump chamber and Figures 5 to 9 As shown in the pump chamber of this embodiment, it can be found that in the existing conventional pump body 2 and pump cover 1, the pump body 2 is a part with a deeper inner cavity, and the pump cover 1 is a shorter part that serves as a support part for installing moving parts such as bearings. In actual application, when the existing conventional structure of the pump body 2 meets the design requirements of certain parameters, the inner hole depth of the pump body 2 is relatively deep. When the axial length of the pump body 2 is large, the cylindricity of the inner hole (main pump cavity) of the pump body 2 is difficult to ensure during the processing of the pump body 2. The inner hole diameter will also suffer from defects such as tool vibration, inner hole deformation, and diameter taper due to the tool extending too long. In this embodiment, a portion of the inner hole depth of the pump body 2 is transferred to the pump cover 1. After such adjustment, the inner hole depth of the pump body 2 can be reduced to 2 / 3 or even 1 / 2 of the original depth, greatly reducing the processing difficulty of the pump body 2 while still ensuring the processing accuracy of the pump body 2. At the same time, the pump chamber 121 is machined on the pump cover 1. When the depth of the main chamber on the pump body 2 remains unchanged, a longer pump chamber that meets corresponding requirements can be machined under existing machining accuracy.

[0047] The beneficial effect of the pump chamber of the first embodiment of the present invention is that the pump chamber includes a pump body 2 and a pump cover 1, a part of the pump chamber is formed on the pump cover 1, and a part of the pump chamber is formed on the pump body 2, and the pump cover 1 and the pump body 2 share the depth of the entire pump chamber. Through the reasonable distribution of the depth of the entire pump chamber by the pump cover 1 and the pump chamber, the depth of the pump chamber on the pump body 2 can be shorter, thereby significantly reducing the processing difficulty of the pump body 2, or, when the processing difficulty of the pump body 2 remains unchanged, a complete pump chamber with a greater depth formed by the main pump chamber of the pump body 2 and the cover pump chamber 121 of the pump cover 1 is obtained.

[0048] The embodiment of the present invention also provides a vacuum pump, which includes the aforementioned pump chamber. The vacuum pump is a screw vacuum pump, the cover base 11 is provided with two parallel through-going axial holes 111, and two screw rotors are provided in the pump chamber.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. Pump cover (1), characterized in that: The pump cover (1) comprises: The cover base (11) is provided with an axial hole (111); The cover pump chamber portion (12) is formed by axially extending from one axial end of the shaft hole (111) of the cover base (11), and has a cover pump chamber (121) communicated with the shaft hole (111).

2. The pump cover (1) according to claim 1, characterized in that: The ratio of the axial dimensions of the cover pump chamber (12) and the cover base (11) is 1:1-5:

1.

3. The pump cover (1) according to claim 1, characterized in that: An air inlet hole (13) is provided on the upper portion of the pump cover (1), and the air inlet hole (13) is vertically and directly connected to the cover pump chamber (121).

4. The pump cover (1) according to claim 1, characterized in that: An air inlet hole (13) is provided at the upper portion of the pump cover (1), and the air inlet hole (13) is located at the junction of the cover base (11) and the cover pump chamber (12), and the radial dimension of the air inlet hole (13) located at the cover pump chamber (12) is not less than the radial dimension of the air inlet hole (13) located at the pump cover (1).

5. The pump cover (1) according to claim 4, characterized in that: The ratio of the radial dimension of the air inlet hole (13) located at the cover pump chamber (12) to the radial dimension of the air inlet hole (13) located at the cover base (11) is 1:1-4:

1.

6. The pump cover (1) according to claim 1, characterized in that: The end surface of the cover pump chamber (12) away from the cover base (11) forms a connecting hole.

7. A pump chamber, comprising a pump body (2) and a pump cover (1), characterized in that: The pump cover (1) is the pump cover (1) according to any one of claims 1 to 6, and the pump body (2) forms a main pump chamber that is coaxially connected to the axial hole (111) of the cover pump chamber (12).

8. The pump chamber according to claim 7, characterized in that: The ratio of the axial length of the main pump chamber of the pump body (2) to the axial length of the cover pump chamber (121) of the pump cover (1) is 1:1-3:

1.

9. A vacuum pump, comprising a pump chamber, characterized in that: The pump chamber is the pump chamber according to claim 7 or 8.

10. The vacuum pump according to claim 9, characterized in that: The vacuum pump is a screw vacuum pump, the cover base (11) is provided with two parallel through-going axial holes (111), and two screw rotors are arranged in the pump chamber.