Dynamic balance assembly for molecular pump impeller

Abstract

The utility model relates to the technical field of molecular pumps, in particular to a dynamic balance assembly for a molecular pump impeller. The dynamic balance assembly for the molecular pump impeller comprises an impeller and a dummy shaft, the impeller comprises an impeller body, blades and a first mounting part, the blades are arranged on the periphery of the impeller body, and the first mounting part is arranged on the inner periphery of the impeller body; the dummy shaft is arranged in the impeller body and comprises a dummy shaft body and a second mounting part, and the second mounting part is arranged on the periphery of the dummy shaft body; wherein the first mounting part is provided with a first via hole, the dummy shaft body is in clearance fit with the first via hole, a first sealing ring is arranged between the dummy shaft body and the inner wall of the first via hole, and the first mounting part is fixedly connected with the second mounting part. The technical effect of improving the installation efficiency of the impeller and the dynamic balance dummy shaft is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of molecular pump, in particular to a dynamic balancing assembly for a molecular pump impeller. BACKGROUND

[0002] After the impeller of a molecular pump is processed, it needs to be off-line balanced to reduce weight so as to meet the use requirements. When the dynamic balancing test of the impeller is performed, a dummy shaft needs to be installed on the impeller, and then the impeller and the dummy shaft are placed on a dynamic balancing machine for off-line balancing.

[0003] Since the dynamic balancing dummy shaft and the impeller need to be firmly installed, the dynamic balancing dummy shaft and the impeller are currently installed in an interference fit. The dynamic balancing dummy shaft and the impeller need to be hot-mounted. Before installation, the impeller needs to be heated at 150 DEG C for one hour, and then the impeller is quickly installed. The whole installation process is time-consuming and laborious. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a dynamic balancing assembly for a molecular pump impeller, which solves the technical problem of time-consuming and laborious installation between the dynamic balancing dummy shaft and the impeller, and achieves the technical effect of improving the installation efficiency of the impeller and the dynamic balancing dummy shaft.

[0005] In order to achieve the above-mentioned purpose, the main technical scheme adopted by the present application comprises:

[0006] The present application provides a dynamic balancing assembly for a molecular pump impeller, which solves the technical problem of time-consuming and laborious installation between the dynamic balancing dummy shaft and the impeller, and achieves the technical effect of improving the installation efficiency of the impeller and the dynamic balancing dummy shaft.

[0007] The dynamic balancing assembly provided by the present application is gap-fitted between the dummy shaft body and the first through hole of the impeller, the first sealing ring is arranged between the dummy shaft body and the inner wall of the first through hole, the first sealing ring is pressed between the dummy shaft body and the inner wall of the first through hole, the dummy shaft body and the first through hole compress the first sealing ring, the fixation between the first through hole of the impeller and the dummy shaft body is achieved, the whole installation and disassembly process is simple and convenient, and the probability of damaging the first mounting hole of the impeller is reduced.

[0008] Optionally, the first sealing ring is a plurality of, along the axial direction of the shaft body, the plurality of first sealing ring is arranged at intervals. The plurality of first sealing rings arranged at intervals are arranged between the shaft body and the first through hole, thereby enhancing the connection between the shaft body and the first through hole of the impeller.

[0009] Optionally, the shaft body includes a first connecting section, the first connecting section is in clearance fit with the first through hole, and a plurality of first grooves are arranged on the radial outer surface of the first connecting section, and each first sealing ring is arranged in a corresponding first groove. The radial outer surface of the first connecting section is provided with a plurality of first grooves, and each first groove corresponds to a first sealing ring. The plurality of first sealing rings are pressed between the inner wall of the first through hole and the first groove, thereby achieving the fixation between the impeller and the shaft body, and the whole installation and disassembly process is simple and convenient.

[0010] Optionally, along the radial direction of the shaft body, the first sealing ring protrudes from the radial outer circumferential surface of the first connecting section, so that the first sealing ring abuts against the inner wall of the first through hole. The plurality of first sealing rings protrude from the radial outer circumferential surface of the first connecting section, the inner wall of the first through hole presses the first sealing ring, and the first sealing ring is compressed, thereby achieving the fixation between the impeller and the shaft body, and the whole installation and disassembly process is simple and convenient.

[0011] Optionally, the gap between the radial outer circumferential surface of the first connecting section and the inner wall of the first through hole is A, and 0.3mm≤A≤0.8mm is satisfied. The gap is arranged between the radial outer circumferential surface of the first connecting section and the inner wall of the first through hole, thereby facilitating the installation and disassembly between the shaft body and the first through hole.

[0012] Optionally, the compression amount X of the first sealing ring satisfies 15%≤X≤30%. If the compression amount of the first sealing ring is too large, the cooperation between the first through hole of the impeller and the shaft body cannot be guaranteed to be firm; if the compression amount of the first sealing ring is too small, the installation between the shaft body and the first through hole is still difficult, and even the first through hole of the impeller can be damaged. The first sealing ring has a suitable compression amount, so that the cooperation and installation between the shaft body and the first through hole are simple and convenient.

[0013] Optionally, the first mounting portion includes a first fitting area surrounding the first through hole, the first fitting area is arranged opposite to at least part of the second mounting portion along the axial direction of the shaft body, and the first fitting area is fixedly connected with the second mounting portion through a fastener. The first fitting area is arranged around the first through hole and is connected with the second mounting portion through a fastener, thereby achieving the fastening between the shaft and the impeller and improving the stability of the dynamic balance test of the impeller.

[0014] Optionally, the fasteners are a plurality of fasteners, and the plurality of fasteners are arranged at intervals along the circumference of the dummy shaft body. The plurality of fasteners arranged at intervals along the circumference of the dummy shaft body enhances the connection strength between the dummy shaft and the impeller.

[0015] Optionally, the first fitting area is provided with a plurality of spaced first mounting holes along the circumference of the dummy shaft body, and the second mounting portion is provided with a plurality of spaced second mounting holes, and each fastener passes through a corresponding first mounting hole and a corresponding second mounting hole. Each fastener passing through the first mounting hole and the second mounting hole realizes the fixed connection between the dummy shaft and the impeller.

[0016] Optionally, at least one of the first mounting hole and the second mounting hole is configured as a threaded hole. Each fastener passes through the first mounting hole and the second mounting hole and is screwed with at least one of the first mounting hole or the second mounting hole to enhance the connection strength between the dummy shaft and the impeller. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 It is a structural schematic diagram of the dynamic balancing assembly of the present application.

[0019]

Explanation of reference numerals

[0020] 1: Impeller; 11: Impeller body; 12: Blade; 13: First mounting portion; 131: First via hole; 132: First fitting area; 133: First mounting hole;

[0021] 2: Dummy shaft; 21: Dummy shaft body; 211: First connecting section; 2111: First groove; 22: Second mounting portion; 221: Second mounting hole;

[0022] 3: First sealing ring;

[0023] 4: Fastener. DETAILED DESCRIPTION

[0024] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0025] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification of the present application and claims and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification of the present application and claims or the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0026] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0029] In the present application, "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0030] Since the dynamic balance dummy shaft and the impeller need to be installed firmly, the dynamic balance dummy shaft and the impeller are currently installed in an interference fit. The dynamic balance dummy shaft and the impeller need to be installed by heating, and the impeller needs to be heated at 150 DEG C for one hour before installation, and then installed quickly. The whole installation process is time-consuming and laborious, and is prone to damage the installation of the impeller installation dummy shaft. Therefore, a dynamic balance test assembly that is easy to install and reduces damage to the impeller is needed.

[0031] In view of this, with reference to Figure 1 , the embodiment of the present application provides a dynamic balance assembly for a molecular pump impeller 1, comprising an impeller 1 and a dummy shaft 2, the impeller 1 comprising an impeller body 11, blades 12 and a first mounting portion 13, the blades 12 being arranged on the outer periphery of the impeller body 11, and the first mounting portion 13 being arranged on the inner periphery of the impeller body 11; the dummy shaft 2 is arranged in the impeller body 11, and the dummy shaft 2 comprises a dummy shaft body 21 and a second mounting portion 22, and the second mounting portion 22 is arranged on the outer periphery of the dummy shaft body 21; wherein the first mounting portion 13 is provided with a first through hole 131, the dummy shaft body 21 is in clearance fit with the first through hole 131, a first sealing ring 3 is arranged between the dummy shaft body 21 and the inner wall of the first through hole 131, and the first mounting portion 13 is fixedly connected with the second mounting portion 22.

[0032] The dummy shaft body 21 passes through the first through hole 131 and is in clearance fit with the inner wall of the first through hole 131, the first sealing ring 3 is pressed between the dummy shaft body 21 and the inner wall of the first through hole 131, and the first mounting portion 13 and the second mounting portion 22 are fixedly connected. It should be understood that the second mounting portion 22 can be in interference fit with the dummy shaft body 21, or can be integrally formed with the dummy shaft body 21.

[0033] The dynamic balance assembly provided by the embodiment of the present application is in clearance fit between the dummy shaft body 21 and the first through hole 131 of the impeller 1, the first sealing ring 3 is arranged between the dummy shaft body 21 and the inner wall of the first through hole 131, the first sealing ring 3 is pressed between the dummy shaft body 21 and the inner wall of the first through hole 131, and the dummy shaft body 21 and the first through hole 131 compress the first sealing ring 3, thereby achieving the fixation between the first through hole 131 of the impeller 1 and the dummy shaft body 21. Compared with the interference fit between the first through hole 131 and the dummy shaft body 21 in the prior art, the fixation between the first through hole 131 of the impeller 1 and the dummy shaft body 21 is achieved by compressing the first sealing ring 3 by the dummy shaft body 21 and the first through hole 131 in the present application, the whole installation and disassembly process is simple and convenient, and the probability of damaging the first mounting hole 133 of the impeller 1 is reduced.

[0034] Optionally, the first sealing ring 3 is a plurality of first sealing rings 3, and the plurality of first sealing rings 3 are arranged at intervals in the axial direction of the dummy shaft body 21. The plurality of first sealing rings 3 arranged at intervals are arranged between the dummy shaft body 21 and the first through hole 131, thereby enhancing the connection between the dummy shaft body 21 and the first through hole 131 of the impeller 1.

[0035] Optionally, the dummy shaft body 21 comprises a first connecting section 211, the first connecting section 211 is gap-fitted with the first through hole 131, a plurality of first grooves 2111 are arranged on the radial outer surface of the first connecting section 211, and each first sealing ring 3 is arranged in a corresponding first groove 2111. Specifically, the dummy shaft body 21 comprises a first connecting section 211, the first connecting section 211 is spaced apart from or adjacent to the second mounting portion 22, the first connecting section 211 passes through the first through hole 131 and is gap-fitted with the first through hole 131, the radial outer surface of the first connecting section 211 is provided with a plurality of first grooves 2111, and each first groove 2111 corresponds to one first sealing ring 3, the plurality of first sealing rings 3 are pressed between the inner wall of the first through hole 131 and the first grooves 2111, thereby achieving the fixation between the impeller 1 and the dummy shaft body 21, and the entire installation and disassembly process is simple and convenient.

[0036] Optionally, along the radial direction of the dummy shaft body 21, the first sealing ring 3 protrudes from the radial outer circumferential surface of the first connecting section 211, so that the first sealing ring 3 abuts against the inner wall of the first through hole 131. The plurality of first sealing rings 3 protrude from the radial outer circumferential surface of the first connecting section 211, the inner wall of the first through hole 131 presses the first sealing ring 3, the first sealing ring 3 is compressed, thereby achieving the fixation between the impeller 1 and the dummy shaft body 21, and the entire installation and disassembly process is simple and convenient.

[0037] Optionally, the gap between the radial outer circumferential surface of the first connecting section 211 and the inner wall of the first through hole 131 is A, and 0.3mm≤A≤0.8mm is satisfied. The gap is arranged between the radial outer circumferential surface of the first connecting section 211 and the inner wall of the first through hole 131, thereby facilitating the installation and disassembly between the dummy shaft body 21 and the first through hole 131.

[0038] In an optional embodiment, the gap between the radial outer circumferential surface of the first connecting section 211 and the inner wall of the first through hole 131 is 0.5mm.

[0039] Optionally, the compression amount X of the first sealing ring 3 satisfies 15%≤X≤30%. The first sealing ring 3 is gap-fitted between the dummy shaft body 21 and the impeller 1, and the fixation is achieved by compressing the first sealing ring 3. The compression amount X of the first sealing ring 3 satisfies 15%≤X≤30%, so that the first sealing ring 3 has a suitable compression amount, and the installation of the dummy shaft body 21 and the first mounting hole 133 is simple and convenient. If the compression amount of the first sealing ring 3 is too large, the fixation between the first through hole 131 of the impeller 1 and the dummy shaft body 21 cannot be guaranteed. If the compression amount of the first sealing ring 3 is too small, the installation between the dummy shaft body 21 and the first through hole 131 is still difficult, and the first through hole 131 of the impeller 1 may be damaged.

[0040] In an optional embodiment, the compression amount of the first sealing ring 3 is 20%.

[0041] Optionally, the first mounting portion 13 comprises a first matching area 132 surrounding the first through hole 131, the first matching area 132 is arranged opposite to at least part of the second mounting portion 22 along the axial direction of the shaft body 21, and the first matching area 132 is fixedly connected with the second mounting portion 22 through the fastener 4. The first matching area 132 is arranged around the first through hole 131 and is connected with the second mounting portion 22 through the fastener 4, so as to realize the fastening between the shaft 2 and the impeller 1 and improve the stability of the dynamic balance test of the impeller 1.

[0042] Optionally, the fastener 4 is a plurality of fasteners 4, and the plurality of fasteners 4 are arranged at intervals along the circumferential direction of the shaft body 21. The plurality of fasteners 4 are arranged at intervals along the circumferential direction of the shaft body 21, so as to enhance the connection strength between the shaft 2 and the impeller 1.

[0043] Optionally, the first matching area 132 is provided with a plurality of first mounting holes 133 arranged at intervals along the circumferential direction of the shaft body 21, and the second mounting portion 22 is provided with a plurality of second mounting holes 221 arranged at intervals, and each fastener 4 passes through a corresponding first mounting hole 133 and a corresponding second mounting hole 221. Each fastener 4 passes through the first mounting hole 133 and the second mounting hole 221 to realize the fixed connection between the shaft 2 and the impeller 1.

[0044] Optionally, at least one of the first mounting hole 133 and the second mounting hole 221 is configured as a threaded hole. Each fastener 4 passes through the first mounting hole 133 and the second mounting hole 221 and is threadedly connected with at least one of the first mounting hole 133 or the second mounting hole 221, so as to enhance the connection strength between the shaft 2 and the impeller 1.

[0045] In an optional embodiment, the second mounting hole 221 is configured as a threaded hole, and the fastener 4 passes through the first mounting hole 133 and is threadedly matched with the second mounting hole 221.

[0046] In the present application, the gap fit between the shaft body 21 and the first through hole 131 of the impeller 1 is achieved by arranging a plurality of first grooves 2111 on the first connecting section 211 of the shaft body 21, and one first sealing member is arranged in each first groove 2111. The inner wall of the first through hole 131 compresses the first sealing member, so as to realize the fixation between the impeller 1 and the shaft 2. The above-mentioned way of fixing the impeller 1 and the shaft 2 does not need to preheat the impeller 1, the installation and disassembly process is simple, time-saving and labor-saving, and can reduce the damage of the inner wall of the first through hole 131 of the impeller 1 caused by the installation of the shaft 2.

[0047] It should also be noted that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. In the context of the specification, the term "and / or" means "and" or "or", and the term "or" means "and" or "or". In the context of the specification, the term "exemplary" means "example" or "an example of".

[0048] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0049] The above only describes the embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

[0050] Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A dynamic balancing assembly for a molecular pump impeller, characterized by, The impeller comprises an impeller body, blades arranged at the outer periphery of the impeller body, and a first mounting portion arranged at the inner periphery of the impeller body; the dummy shaft comprises a dummy shaft body and a second mounting portion arranged at the outer periphery of the dummy shaft body; the first mounting portion is provided with a first through hole, the dummy shaft body is in clearance fit with the first through hole, a first sealing ring is arranged between the dummy shaft body and the inner wall of the first through hole, and the first mounting portion is fixedly connected with the second mounting portion. The first sealing ring is a plurality of first sealing rings, which are arranged at intervals along the axial direction of the dummy shaft body. The dummy shaft body comprises a first connecting section in clearance fit with the first through hole, and a plurality of first grooves are arranged on the radial outer surface of the first connecting section, and each first sealing ring is arranged in a corresponding first groove. Along the radial direction of the dummy shaft body, the first sealing ring protrudes from the radial outer periphery of the first connecting section, so that the first sealing ring abuts against the inner wall of the first through hole.

2. The dynamic balancing assembly of claim 1, wherein, The gap between the radial outer periphery of the first connecting section and the inner wall of the first through hole is A, and 0.3mm≤A≤0.8mm is satisfied.

3. The dynamic balancing assembly of claim 2, wherein, The compression amount X of the first sealing ring satisfies 15%≤X≤30%.

4. The dynamic balancing assembly of claim 3, wherein, The first mounting portion comprises a first fitting area surrounding the first through hole, and the first fitting area is arranged opposite to at least part of the second mounting portion along the axial direction of the dummy shaft body, and the first fitting area is fixedly connected with the second mounting portion by a fastener.

5. The dynamic balancing assembly of claim 3, wherein, The fastener is a plurality of fasteners, which are arranged at intervals along the circumferential direction of the dummy shaft body.

6. The dynamic balancing assembly of claim 5, wherein, Along the circumferential direction of the dummy shaft body, the first fitting area is provided with a plurality of first mounting holes arranged at intervals, and the second mounting portion is provided with a plurality of second mounting holes arranged at intervals, each fastener passes through a corresponding first mounting hole and a corresponding second mounting hole.

7. The dynamic balancing assembly of claim 1, wherein, At least one of the first mounting hole and the second mounting hole is configured as a threaded hole.

8. The dynamic balancing assembly of claim 7, wherein, ​ 9. A dynamic balancing assembly according to claim 8, wherein, ​ 10. A dynamic balancing assembly according to claim 9, wherein, ​

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