Roots vacuum pump rotor with inner support

Abstract

The utility model belongs to the technical field of Roots vacuum pumps, and particularly relates to a Roots vacuum pump rotor with an inner support. In order to overcome the defect that the weight and the structural strength of an existing roots vacuum pump rotor cannot be considered at the same time, the roots vacuum pump rotor with the inner support adopts the following technical scheme that the roots vacuum pump rotor with the inner support comprises a central opening part and a plurality of blade parts, the central opening part is provided with a shaft hole, the blade parts are provided with balance holes, and the shaft hole is communicated with the shaft hole. And a plurality of supporting ribs are formed in the balance holes. The roots vacuum pump rotor with the inner support has the advantages that the balance holes are formed in the blade portions, the supporting ribs are formed in the balance holes, the wall thickness of the blade portions can be smaller by arranging the supporting ribs, and compared with an existing structure which is only provided with the balance holes and not provided with the supporting ribs, the roots vacuum pump rotor with the inner support is lighter in weight, the structural strength can be guaranteed, and the service life of the roots vacuum pump rotor is prolonged. The structural strength and light weight can be both considered, so that the material consumption is reduced, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of Roots vacuum pumps, and particularly relates to a Roots vacuum pump rotor with an internal support. Background Art

[0002] A Roots vacuum pump is a variable volume vacuum pump in which there are two leaf-shaped rotors rotating synchronously in opposite directions inside the pump. There are small gaps between the rotors and between the rotors and the inner wall of the pump housing, and they do not contact each other. The Roots vacuum pump relies on the pushing action of a pair of leaf-shaped rotors rotating synchronously and in opposite directions in the pump chamber to move gas and achieve air extraction.

[0003] Since the Roots vacuum pump moves gas through the pushing action of the high-speed rotation of the rotor to achieve air extraction during operation, the rotor will be subject to the reaction force of the gas. Therefore, the rotor usually has a relatively thick inner wall to ensure sufficient structural strength and avoid rotor deformation. This makes the rotor heavy.

[0004] There are usually two common methods for existing Roots vacuum pump rotors: 1. Except for the shaft holes used to connect the rotating shafts, other parts are solid; 2. Except for the shaft holes used to connect the rotating shafts, balance holes are also provided (the number of balance holes corresponds to the number of blades, which can be seen in Figure 1 ). Even if balance holes are provided, due to the lack of internal support, in order to ensure structural strength, the rotor is still heavy, requires more material consumption, and more importantly, consumes more energy and takes longer to start or stop (the starting inertia torque is large and the acceleration is slow). Summary of the Invention

[0005] Aiming at the deficiency that the existing Roots vacuum pump rotor fails to balance weight and structural strength, the utility model provides a Roots vacuum pump rotor with an internal support, which realizes lightweight while ensuring the structural strength of the rotor.

[0006] To achieve the above object, the utility model adopts the following technical scheme: The Roots vacuum pump rotor with an internal support includes a rotor body, the rotor body includes a central part and a plurality of blade parts, balance holes are provided in each of the blade parts, and at least one support rib is formed in each of the balance holes.

[0007] The Roots vacuum pump rotor with internal support of the present utility model has balance holes formed in the blade part of the rotor body, and support ribs are formed in the balance holes. By setting the support ribs, the wall thickness of the blade part can be smaller. Compared with the existing structure that only has balance holes without support ribs, the weight can be lighter, and the structural strength can also be ensured, that is, both structural strength and lightweight can be taken into account; the material usage is reduced, and after the weight is reduced, the vacuum pump starts or stops faster and more easily, and the energy consumption can also be reduced. When the wall thickness of the blade part remains unchanged, after adding support ribs, under the same profile dimensions, its structural strength is better than that of the existing structure with only balance holes without support ribs, and its weight is smaller than that of the existing structure without balance holes, so a better balance is achieved between weight and structural strength. After the structure is improved, it is also helpful for the selection of materials.

[0008] As an improvement, multiple support ribs are formed in each of the balance holes, and the multiple support ribs in the same balance hole are radially distributed.

[0009] As an improvement, the radiation center of the multiple radially distributed support ribs is located in the balance hole, or the radiation center of the multiple radially distributed support ribs is the center of the central part.

[0010] As an improvement, multiple support ribs are formed in each of the balance holes, and the multiple support ribs in the same balance hole are parallelly distributed.

[0011] As an improvement, all the support ribs are distributed along the extending direction of the blade part, or all the support ribs are perpendicular to the extending direction of the blade part.

[0012] As an improvement, the thickness of all the support ribs is the same; all the support ribs are in the shape of flat plates.

[0013] As an improvement, the shape of the balance hole is adapted to the profile of the blade part, or the balance hole is a round hole.

[0014] As an improvement, the number of the support ribs in the same balance hole is two to five.

[0015] As an improvement, the number of the blade parts is two, three or four.

[0016] As an improvement, the Roots vacuum pump rotor with internal support further includes a rotor shaft, and a shaft hole adapted to the rotor shaft is formed in the central part of the rotor body, or the rotor body is integrally formed with the rotor shaft.

[0017] The beneficial effects of the Roots vacuum pump rotor with internal support of the present utility model are as follows: Balance holes are provided in the blade part of the rotor body, and support ribs are formed in the balance holes. By providing the support ribs, the wall thickness of the blade part can be smaller. Compared with the existing structure with only balance holes and no support ribs, the weight can be lighter, and the structural strength can also be ensured, that is, both structural strength and light weight can be taken into account, thereby reducing the material consumption and energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a cross-sectional view of an existing Roots vacuum pump rotor.

[0019] Figure 2 FIG. is a cross-sectional view of the Roots vacuum pump rotor with internal support according to the first embodiment of the present utility model.

[0020] Figure 3 FIG. is a cross-sectional view of the Roots vacuum pump rotor with internal support according to the second embodiment of the present utility model.

[0021] Figure 4 FIG. is a cross-sectional view of the Roots vacuum pump rotor with internal support according to the third embodiment of the present utility model.

[0022] Figure 5 FIG. is a cross-sectional view of the Roots vacuum pump rotor with internal support according to the fourth embodiment of the present utility model.

[0023] Figure 6 FIG. is a cross-sectional view of the Roots vacuum pump rotor with internal support according to the fifth embodiment of the present utility model.

[0024] Figure 7 FIG. is a cross-sectional view of the Roots vacuum pump rotor with internal support according to the sixth embodiment of the present utility model.

[0025] In the figures, 1, central part;

[0026] 2, blade part;

[0027] 3, shaft hole;

[0028] 4, balance hole;

[0029] 5, support rib. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The technical solutions of the embodiments of the present invention will be explained and described below. However, the following embodiments are only the preferred embodiments of the present invention and not all of them. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0031] See Figures 2 to 7, the rotor of the Roots vacuum pump with internal support according to the embodiment of the present utility model, the rotor of the Roots vacuum pump with internal support includes a rotor body, the rotor body includes a central part and a plurality of blade parts, balance holes are formed in each of the blade parts, and at least one support rib is formed in each of the balance holes. The rotor of the Roots vacuum pump with internal support is axisymmetric.

[0032] For the rotor of the Roots vacuum pump with internal support of the present utility model, balance holes are formed in the blade parts of the rotor body, and multiple support ribs are formed in the balance holes. By arranging the support ribs, the wall thickness of the blade parts can be smaller. Compared with the existing structure that only has balance holes without support ribs, the weight can be lighter, and the structural strength can also be ensured, that is, both structural strength and lightweight can be taken into account.

[0033] Embodiment 1

[0034] See Figure 2 , the rotor of the Roots vacuum pump with internal support according to the second embodiment of the present utility model, the rotor of the Roots vacuum pump with internal support includes a rotor body, the rotor body includes a central part 1 and a plurality of blade parts 2, balance holes 4 are formed in each of the blade parts 2, and multiple support ribs 5 are formed in each of the balance holes 4.

[0035] In this embodiment, the multiple support ribs 5 in the same balance hole 4 are radially arranged.

[0036] In this embodiment, the radial center of the radially arranged multiple support ribs 5 is located in the balance hole 4.

[0037] In this embodiment, the number of support ribs 5 in the same balance hole 4 is four, and the four support ribs 5 intersect in the balance hole 4.

[0038] In this embodiment, the thickness of all the support ribs 5 is the same.

[0039] In this embodiment, all the support ribs 5 are in the shape of flat plates.

[0040] In this embodiment, the shape of the balance hole 4 is adapted to the profile of the blade part 2.

[0041] In this embodiment, the number of the blade parts 2 is two, and the number of the balance holes 4 is two.

[0042] In this embodiment, fillet transitions are made between the support ribs 5, between the support ribs 5 and the central part 1, and between the support ribs 5 and the inner wall of the balance hole 4.

[0043] In this embodiment, the rotor of the Roots vacuum pump with internal support further includes a rotor shaft, and a shaft hole 3 adapted to the rotor shaft is formed in the central part 1 of the rotor body. The rotor shaft is not shown in the figure.

[0044] In other embodiments, the rotor shaft and the rotor body of the Roots vacuum pump rotor with an internal support may also be integrally formed.

[0045] In other embodiments, support ribs may also be directly added to the balance holes. Although this increases the material usage, the structural strength can be significantly enhanced. Compared with the structure without balance holes, the weight is also reduced. Therefore, a better balance can be achieved between weight and structural strength.

[0046] Taking the rotor of an existing Roots pump (such as the model VBP100 produced by Zhejiang Feiyue Electromechanical Co., Ltd.) as an example, its rotor body adopts Figure 1 the structure shown. The cross-sectional area of the rotor body is approximately 2512 square millimeters. When it is changed to adopt Figure 2 the structure shown (the profile line remains unchanged), on the premise of ensuring structural strength, the cross-sectional area of the rotor body can be as low as 1521 square millimeters at the lowest, which is 60.5% of Figure 1 the structure shown. When adopting Figures 4 to 6 other schemes, the rotor body also has weight reduction.

[0047] The beneficial effect of the Roots vacuum pump rotor with an internal support in the first embodiment of the present utility model is as follows: Balance holes 4 are provided in the blade part 2 of the rotor body, and multiple support ribs 5 are formed in the balance holes 4. By providing the support ribs 5, the wall thickness of the blade part 2 can be made smaller. Compared with the existing structure with only balance holes 4 and without support ribs 5, the weight can be lighter, and the structural strength can also be ensured, that is, both structural strength and lightweight can be taken into account, thereby reducing material usage and energy consumption; the shape of the balance holes 4 is adapted to the profile line of the blade part 2. Compared with the balance holes 4 being circular holes, the weight can be lighter.

[0048] Embodiment Two

[0049] The difference between Embodiment Two and Embodiment One lies in the shape of the balance holes 4.

[0050] Refer to Figure 3 , in this embodiment, the balance holes 4 are circular holes, and the circular holes are easy to machine. The amount of material required in this embodiment is larger than that in Embodiment One.

[0051] In this embodiment, the material usage of the rotor body is basically equivalent to that in Figure 1 (the material savings brought by increasing the balance holes 4 and the material increase brought by adding the support ribs 5 are basically equivalent), but the structural strength is significantly enhanced.

[0052] Embodiment Two

[0053] The difference between Embodiment Three and Embodiment One lies in the distribution of the support ribs 5.

[0054] Refer to Figure 4, in this embodiment, the radiation center of the multiple radially arranged support ribs 5 is the shaft hole 3. The number of support ribs 5 in the same balance hole 4 is three.

[0055] Embodiment 4

[0056] The difference between Embodiment 4 and Embodiment 1 lies in the distribution of the support ribs 5.

[0057] See Figure 5 , in this embodiment, multiple support ribs 5 in the same balance hole 4 are parallelly distributed. All the support ribs 5 are distributed along the extending direction of the blade part 2. The extending direction of the blade part 2 is Figure 5 the up-down height direction in

[0058] In this embodiment, after the support ribs 5 extend along the extending direction of the blade part 2, they overlap in pairs.

[0059] Embodiment 5

[0060] The difference between Embodiment 5 and Embodiment 1 lies in the distribution of the support ribs 5.

[0061] See Figure 6 , in this embodiment, multiple support ribs 5 in the same balance hole 4 are parallelly distributed. All the support ribs 5 are perpendicular to the extending direction of the blade part 2. The extending direction of the blade part 2 is Figure 5 the up-down height direction in Figure 5 the left-right width direction in. The number of support ribs 5 in the same balance hole 4 is three.

[0062] In this embodiment, all the support ribs 5 are parallel.

[0063] Embodiment 6

[0064] The difference between Embodiment 6 and Embodiment 1 lies in the number of blade parts 2.

[0065] See Figure 7 , in this embodiment, the number of the blade parts 2 is three.

[0066] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the content described in the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. Roots vacuum pump rotor with internal support, characterized in that: The Roots vacuum pump rotor with internal support includes a rotor body, which includes a central part (1) and a plurality of blade parts (2). Balance holes (4) are formed in each of the blade parts (2), and at least one support rib (5) is formed in each of the balance holes (4).

2. The Roots vacuum pump rotor with an internal support according to claim 1, characterized in that: A plurality of support ribs (5) are formed in each of the balance holes (4), and the plurality of support ribs (5) in the same balance hole (4) are radially arranged.

3. The Roots vacuum pump rotor with an internal support according to claim 2, characterized in that: The radiation center of the radially arranged plurality of support ribs (5) is located in the balance hole (4), or the radiation center of the radially arranged plurality of support ribs (5) is the center of the central part (1).

4. The Roots vacuum pump rotor with internal support according to claim 1, characterized in that: A plurality of support ribs (5) are formed in each of the balance holes (4), and the plurality of support ribs (5) in the same balance hole (4) are parallelly distributed.

5. The Roots vacuum pump rotor with an internal support according to claim 4, characterized in that: All the support ribs (5) are distributed along the extending direction of the blade part (2), or all the support ribs (5) are perpendicular to the extending direction of the blade part (2).

6. The Roots vacuum pump rotor with internal support according to claim 1, characterized in that: All the support ribs (5) have the same thickness; all the support ribs (5) are in the shape of flat plates.

7. The Roots vacuum pump rotor with an internal support according to claim 1, characterized in that: The shape of the balance hole (4) is adapted to the profile of the blade part (2), or the balance hole (4) is a round hole.

8. The Roots vacuum pump rotor with an internal support according to claim 1, characterized in that: The number of the support ribs (5) in the same balance hole (4) is two to five.

9. The Roots vacuum pump rotor with an internal support according to claim 1, characterized in that: The number of the blade parts (2) is two, three or four.

10. The Roots vacuum pump rotor with an internal support according to claim 1, characterized in that: The Roots vacuum pump rotor with internal support further includes a rotor shaft. A shaft hole (3) adapted to the rotor shaft is formed in the central part (1) of the rotor body, or the rotor body is integrally formed with the rotor shaft.

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