CN219809135U

CN219809135U - Vacuum pump assembly capable of improving process object accommodating capacity

Info

Publication number: CN219809135U
Application number: CN202320593059.0U
Authority: CN
Inventors: 魏民; 雷晓宏; 雷晓波; 彭冲
Original assignee: Beijing Tongjia Hongrui Technology Co ltd
Current assignee: Beijing Tongjia Hongrui Technology Co ltd
Priority date: 2023-03-23
Filing date: 2023-03-23
Publication date: 2023-10-10
Anticipated expiration: 2033-03-23

Abstract

The utility model relates to a vacuum pump assembly for improving the process object accommodating capacity, which comprises a front bearing plate, an upper shell, a lower shell, a long rotor, a short rotor and a rear bearing plate; the long rotor and the short rotor respectively rotate around the respective rotating shafts in opposite directions, and the axes of the rotating shafts of the long rotor and the short rotor are mutually parallel; the long rotor and the short rotor respectively comprise multiple stages of rotors which are arranged at intervals in the axial direction of the rotating shafts of the long rotor and the short rotor respectively; the multi-stage rotors of the long rotor and the short rotor are correspondingly meshed with each other, and dust storage grooves are formed in non-key surfaces of the meshed rotors. The utility model improves the holding capacity of the process objects and effectively avoids the phenomenon of pump blocking and abrasion caused by the attachment of the process objects.

Description

Vacuum pump assembly capable of improving process object accommodating capacity

Technical Field

The utility model relates to the technical field of vacuum pumps, in particular to a vacuum pump assembly capable of improving the holding capacity of processing objects.

Background

The vacuum pump is used for pumping out gas molecules from the vacuum chamber, and reducing the gas pressure in the vacuum chamber to achieve the required vacuum degree. The method is mainly applied to the industries of pharmacy and chemical industry, vacuum coating, vacuum drying, surface treatment, vacuum smelting, ceramic manufacturing, food packaging, milking, beverage and the like.

The two axes of the rotor of the vacuum pump are parallel to each other, the rotor is formed by combining impellers and shafts, and tiny gaps are arranged between the impellers, between the impellers and the shell and between the impellers and the wall plates so as to avoid mutual contact. The two rotors are driven by the motor through a pair of synchronous gears to rotate at equal speeds in opposite directions. By means of the mutual engagement of the two impellers, the air inlet and the air outlet of the pump are not directly communicated, the impellers, the shell and the wall plates enclose a closed primitive volume, and the primitive volume is always in a circulation state of air suction, compression, conveying and air exhaust along with the continuous rotation of the impellers, so that air and dust in the cavity are continuously discharged out of the pump to meet the process requirements.

There are many types of dry vacuum pumps on the market. The type of pump required varies with the process used. For example, prior art CN110741165a discloses a dual-shaft vacuum pump comprising: two cooperating rotors configured to rotate in opposite directions about parallel axes of rotation; a stator including a stator bore in which the rotor is mounted for rotation. The stator bore includes a central portion between the two axes of rotation and an outer portion outside the two axes, the rotors being configured to cooperate with the stator bore such that an outer edge of each rotor remote from the other rotor seals with the stator bore when rotated in at least a portion of the outer portion. A fluid inlet is provided in the stator bore, at least a portion of which is in a central portion of the stator bore between the rotational axes. A fluid outlet is provided in the opposite surface of the stator bore, the fluid outlet being in a central portion of the stator bore. The fluid inlet and the fluid outlet are arranged such that, upon rotation of the rotors, the rotors each move a pumping chamber between the fluid inlet and the fluid outlet; wherein at least a portion of the fluid inlet is arranged to extend beyond a central portion of the stator bore. However, in the vacuum pump in the prior art, the holding capacity of the process substances in the pump is obviously insufficient under the application environment of high process substances, and when the vacuum pump works, process substance dust is discharged out of the pump along with exhaust gas, but when the pump stops running, the process substance dust is attached to the surfaces of the rotor and the shell, and because the clearance between the rotor and the shell is very small (minimum 0.02 mm), the attached process substance occupies the clearance space between the rotor and the shell to cause abrasion of the dry vacuum pump, and more serious causes 'blocking', thereby reducing the service life of the vacuum pump and greatly improving the running and maintenance cost of the pump.

Therefore, how to overcome the defects of the prior art, to improve the process object holding capacity of the vacuum pump, and to avoid the pump blocking and abrasion caused by the attachment of the process object dust, is a problem to be solved in the art.

Disclosure of Invention

In order to overcome the above-mentioned shortcomings of the prior art, the present utility model provides a vacuum pump assembly with improved process object holding capability. The utility model adopts the following technical scheme.

A vacuum pump assembly for improving process containment, the vacuum pump assembly comprising: a front bearing plate, an upper shell, a lower shell, a long rotor, a short rotor and a rear bearing plate;

the long rotor and the short rotor respectively rotate around the respective rotating shafts in opposite directions, and the axes of the rotating shafts of the long rotor and the short rotor are mutually parallel;

the long rotor and the short rotor respectively comprise multiple stages of rotors which are arranged at intervals in the axial direction of the rotating shafts of the long rotor and the short rotor respectively;

the multi-stage rotors of the long rotor and the short rotor are correspondingly meshed with each other, and dust storage grooves are formed in non-key surfaces of the meshed rotors.

Further, the vacuum pump assembly includes:

the sections of each of the multi-stage rotors of the long rotor and the short rotor, which are perpendicular to the rotation axis, are Y-shaped trilobal profiles, and when the long rotor and the short rotor rotate, the top end of the blade of one rotor of each stage, which is far away from the other rotor of the stage, forms a seal with the inner side walls of the upper shell and the lower shell;

the non-critical surface of the intermeshing rotors, in particular to the part of each stage of the multistage rotor, which does not form a seal with the inner side walls of the upper shell and the lower shell, and the part of the intermeshing rotor, which is not the peak and valley of the blade.

Further, the length of each of the multi-stage rotors of the long rotor and the short rotor is gradually decreased from the air inlet direction to the air outlet direction along the axial direction of the rotation axis direction.

Further, the number of the dust storage grooves arranged on the long rotors is a plurality, and the dust storage grooves are arranged on the engagement surface of each rotor and are communicated with the end surface of each rotor facing the air inlet direction and are not communicated with the end surface of each rotor facing the air exhaust direction.

Further, the number of the dust storage grooves provided on the short rotor is plural, and the dust storage grooves are provided on the engagement surface of each rotor and are not communicated with the end surface of each rotor facing the air intake direction and are communicated with the end surface of each rotor facing the air exhaust direction.

Further, when the multi-stage rotors of the long rotor and the short rotor are meshed with each other, the dust storage groove arranged on the long rotor is not overlapped with the dust storage groove arranged on the short rotor.

Further, the upper housing and the lower housing respectively comprise multi-stage working cavities corresponding to the multi-stage rotor, and the multi-stage working cavities are arranged at intervals in the axial direction of the rotating shaft.

Further, the two ends of the upper shell, which are opposite to the front bearing plate and the rear bearing plate, are respectively provided with an upper shell side dust storage groove.

Further, the upper surface of the lower shell is provided with a plurality of stage plate dust storage grooves, and the stage plate dust storage grooves are specifically arranged on the upper surface of the partition plate between the multi-stage working cavities.

Further, the two ends of the lower shell, which are opposite to the front bearing plate and the rear bearing plate, are respectively provided with a lower shell side dust storage groove.

The dust storage tank is additionally arranged on the non-key parts of the rotor and the shell, so that the holding capacity of the process objects is improved, and the phenomena of pump blocking and abrasion caused by the attachment of the process objects are effectively avoided.

Drawings

FIG. 1 is a schematic view of a vacuum pump assembly for improving process containment capability according to the present utility model.

FIG. 2 is a schematic view of the structure of a long rotor dust reservoir in the vacuum pump assembly of the present utility model.

FIG. 3 is a schematic view of the structure of the short rotor dust tank in the vacuum pump assembly of the present utility model.

Fig. 4 is a schematic cross-sectional view of a rotor in a vacuum pump assembly of the present utility model.

FIG. 5 is a schematic view of the structure of the upper housing dust reservoir in the vacuum pump assembly of the present utility model.

FIG. 6 is a schematic view of the structure of the dust tank of the lower housing in the vacuum pump assembly of the present utility model.

Detailed Description

The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model. It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

Referring to fig. 1, embodiment 1 of the present utility model relates to a vacuum pump assembly for improving process material holding capacity. The process-object-holding-capacity-enhancing vacuum pump assembly includes: a front bearing plate 1, an upper shell 2, a lower shell 3, a long rotor 4, a short rotor 5 and a rear bearing plate 6.

During installation, the lower shell 3 is firstly placed at a designated position of the vacuum pump, the long rotor 4 and the short rotor 5 are sequentially installed, the upper shell 2 is buckled, and finally the front bearing plate 1 and the rear bearing plate 6 are fixed on two sides of the upper shell 2.

The long rotor 4 and the short rotor 5 rotate around their respective rotation axes in opposite directions, and the axes of the rotation axes of the long rotor 4 and the short rotor 5 are arranged parallel to each other.

Referring to fig. 2 and 3, the long rotor 4 and the short rotor 5 each include a plurality of stages of rotors, respectively, which are arranged at intervals in the axial direction of the rotary shaft. The multi-stage rotors of the long rotor 4 and the short rotor 5 are correspondingly meshed with each other, and dust storage grooves are arranged on non-critical surfaces of the mutual meshing of the rotors.

The sections of each of the multi-stage rotors of the long rotor 4 and the short rotor 5 perpendicular to the rotation axis are Y-shaped trilobal profiles, and when the long rotor 4 and the short rotor 5 rotate, the top ends of the blades of one rotor of each stage, which are far away from the other rotor of the stage, form a seal with the inner side walls of the upper shell 2 and the lower shell 3. The non-critical surface of the rotor intermeshing specifically refers to the part of each stage of the multistage rotor, which does not form a seal with the inner side walls of the upper and lower shells 2, 3, and the intermeshing parts of the rotor lobes and valleys.

Referring to fig. 4, the range of the angle A, B, C is a meshing key surface, a dust storage groove is not allowed to be formed, and the size of the angle A, B, C can be calculated and rounded according to a series of parameters such as a pump center distance, a rotating speed, a maximum outer contour of a rotor and the like and an empirical formula.

And the length of each stage of rotors in the multistage rotors of the long rotor 4 and the short rotor 5 is gradually decreased from the air inlet direction to the air outlet direction along the axial direction of the rotation axis direction.

The number of the dust storage grooves arranged on the long rotor 4 is a plurality, and the dust storage grooves are arranged on the meshing surface of each rotor and are communicated with the end surface of each rotor facing the air inlet direction and are not communicated with the end surface of each rotor facing the air exhaust direction.

The number of the dust storage grooves arranged on the short rotor 5 is a plurality, and the dust storage grooves are arranged on the meshing surface of each rotor, are not communicated with the end surface of each rotor facing the air inlet direction, and are communicated with the end surface of each rotor facing the air exhaust direction.

When the multi-stage rotors of the long rotor 4 and the short rotor 5 are meshed with each other, the dust storage groove arranged on the long rotor 4 is not overlapped with the dust storage groove arranged on the short rotor 5.

Referring to fig. 5 and 6, the upper and lower housings 2 and 3 each include a plurality of stages of working chambers corresponding to the plurality of stages of rotors, and the plurality of stages of working chambers are arranged at intervals in the axial direction of the rotary shaft.

The two ends of the upper shell 2 opposite to the front bearing plate 1 and the rear bearing plate 6 are respectively provided with an upper shell side dust storage groove.

The upper surface of the lower shell 3 is provided with a plurality of stage plate dust storage grooves, the stage plate dust storage grooves are specifically arranged on the upper surface of a partition plate between the multi-stage working cavities, the stage plate dust storage grooves are strip-shaped and are perpendicular to the axial direction of the rotating shaft for processing, and one end of each stage plate dust storage groove penetrates through the contact surface of the lower shell 3 and the rotating shaft. The width of the grade plate dust storage groove is 30% -50% of the width of the partition plate.

The two ends of the lower shell 3 opposite to the front bearing plate 1 and the rear bearing plate 6 are respectively provided with a lower shell side dust storage groove.

The process material containing capacity in the dry vacuum pump is insufficient, and dust such as process material retained in the cavity can adhere to the surfaces of the rotor and the shell to cause the dry vacuum pump to be blocked, so that the service life of the vacuum pump is greatly reduced, and the operation and maintenance cost of the pump are improved. Therefore, some structures are required to improve the process capacity of the chamber.

If the capacity of the chamber for accommodating the process materials is to be increased, the volume of the working chamber is increased. The improvement can be made by analysis from two aspects:

a) From rotor aspect

Because the thickness of each stage of the rotor, the maximum outer contour diameter and the molded line are all fixed, the optimal design can only be carried out from the intermeshing surfaces of the rotors. Considering that the design structure cannot influence the air compressing efficiency, the dust storage tank needs to pay attention to the following points:

1) When the rotors are meshed, the dust storage grooves cannot be overlapped;

2) The dust storage tank can not penetrate through the rotor, otherwise, the two sides of the rotor are communicated, and compressed air can flow back, so that the compressed air efficiency is seriously affected.

b) From the aspect of the shell

The groove width and the groove radius of each stage of the shell are fixed, and the optimal design can be carried out only from the two sides of the stage plate and the shell. Considering that the design structure cannot influence the air compressing efficiency, the dust storage tank needs to pay attention to the following points:

1) When the dust storage groove is designed on the stage plate, the two sides of the stage plate are required to be ensured not to flow through;

2) The dust storage tank can not influence the air compression efficiency;

3) The overall dimension needs to be considered, and meanwhile, the dust storage grooves on the two sides of the shell can not influence the strength of the shell-level plate.

The process object containing capacity of the chamber is improved through the following structural design:

1) Dust storage tank is added on rotor

The dust storage grooves are added on non-key surfaces of the rotors, which are meshed with each other, and the dust storage grooves are machined on each stage of the rotors along the axial direction, but cannot penetrate through the rotors, meanwhile, the long rotors and the short rotors are staggered with each other, the grooving directions are opposite, and the long rotors and the short rotors cannot be meshed with each other, otherwise, gas backflow is caused, and pumping efficiency is affected.

2) Dust storage tank is added on the shell

The dust storage groove on the shell is divided into two parts:

a) A dust storage groove on each stage of plate;

b) Dust storage grooves on two sides of the shell.

The vacuum pump assembly for improving the process substance holding capacity improves the process substance holding capacity by about 15g through the rotor with the dust storage groove structure, and improves the shell by optimizing the lower shell, the dust storage grooves on two sides and the dust storage groove on the grade plate are added on the upper shell, the process substance holding capacity is improved by about 30g, and the technical problem that the dry vacuum pump is blocked due to the fact that the process substance dust remained in the cavity is attached to the surfaces of the rotor and the shell due to the insufficient process substance holding capacity in the dry pump in the prior art is solved. When the dry vacuum pump does not have a dust storage tank, the process object holding capacity is less than 1g, and after the dust storage tank is added on the rotor of the vacuum pump assembly, the process object holding capacity of the pump can reach 15g, and after the dust storage tank is added on the shell, the process object holding capacity of the pump can reach 45g, so that the service life of the pump can be greatly prolonged.

While only the preferred embodiments of the present utility model have been described, it should be noted that modifications and variations can be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.

Claims

1. A vacuum pump assembly for improving process containment, the vacuum pump assembly comprising: a front bearing plate (1), an upper shell (2), a lower shell (3), a long rotor (4), a short rotor (5) and a rear bearing plate (6);

the long rotor (4) and the short rotor (5) rotate around the respective rotation shafts in opposite directions respectively, and the axes of the rotation shafts of the long rotor (4) and the short rotor (5) are arranged in parallel;

the long rotor (4) and the short rotor (5) respectively comprise multiple stages of rotors which are arranged at intervals in the axial direction of the rotating shafts of the long rotor (4) and the short rotor (5);

the multi-stage rotors of the long rotor (4) and the short rotor (5) are correspondingly meshed with each other, and dust storage grooves are formed in non-key surfaces of the meshed rotors.

2. The vacuum pump assembly of claim 1, wherein the vacuum pump assembly comprises:

the sections of each stage of multi-stage rotors of the long rotor (4) and the short rotor (5) perpendicular to the rotation axis are Y-shaped trilobal profiles, and when the long rotor (4) and the short rotor (5) rotate, the top end of the blade of one rotor of each stage, which is far away from the other rotor of the stage, forms a seal with the inner side walls of the upper shell (2) and the lower shell (3);

the non-critical surface of the inter-meshing of the rotors specifically refers to the part of each stage of the multistage rotor, which does not form a seal with the inner side walls of the upper shell (2) and the lower shell (3), and the inter-meshing part of non-blade peaks and non-blade valleys between the rotors.

3. A vacuum pump assembly for improving process-object accommodation capacity according to claim 2, wherein each of the rotors of the long rotor (4) and the short rotor (5) is of a length gradually decreasing from the intake direction to the exhaust direction along the axial direction of the rotation axis direction.

4. A vacuum pump assembly for improving the capacity of process materials according to claim 1, wherein the number of dust storage grooves provided on the long rotor (4) is plural, the dust storage grooves are provided on the engagement surface of each rotor and communicate with the end surface of each rotor facing the air intake direction and do not communicate with the end surface of each rotor facing the air exhaust direction.

5. A vacuum pump assembly for improving the capacity of process materials according to claim 1, wherein the number of the dust storage grooves provided on the short rotor (5) is plural, the dust storage grooves are provided on the engagement surface of each rotor and are not communicated with the end surface of each rotor facing the air intake direction and are communicated with the end surface of each rotor facing the air exhaust direction.

6. A vacuum pump assembly for improving process material holding capacity according to claim 4 or 5, wherein the dust storage groove provided on the long rotor (4) and the dust storage groove provided on the short rotor (5) do not overlap when the multi-stage rotors of the long rotor (4) and the short rotor (5) are engaged with each other.

7. A vacuum pump assembly for improving a process object accommodating capacity according to claim 1, wherein the upper casing (2) and the lower casing (3) each include a plurality of stages of working chambers corresponding to a plurality of stages of rotors, the plurality of stages of working chambers being arranged at intervals in an axial direction of the rotary shaft.

8. A vacuum pump assembly for improving process object holding capacity according to claim 7, wherein the upper housing (2) is provided with upper housing side dust storage grooves at opposite ends of the front bearing plate (1) and the rear bearing plate (6), respectively.

9. A vacuum pump assembly for improving process object holding capacity according to claim 7, wherein a plurality of stage dust storage tanks are provided on the upper surface of the lower housing (3), and the stage dust storage tanks are provided on the upper surface of a partition plate between the multistage working chambers.

10. A vacuum pump assembly for improving process object holding capacity according to claim 8, wherein the lower housing (3) is provided with a lower housing side dust storage tank at opposite ends of the front bearing plate (1) and the rear bearing plate (6).