CN115614280A

CN115614280A - Multi-stage Roots vacuum pump with ventilating partition plate

Info

Publication number: CN115614280A
Application number: CN202211319421.1A
Authority: CN
Inventors: 陆学贵; 杨清霞
Original assignee: Zhejiang Boya Precision Machinery Co ltd
Current assignee: Zhejiang Boya Precision Machinery Co ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2023-01-17

Abstract

The invention discloses a multi-stage Roots vacuum pump with ventilating partition plates, which comprises a shell, wherein a plurality of partition plates are arranged in the shell, the partition plates divide the interior of the shell into a plurality of pump cavities, the top of each pump cavity is provided with an air inlet, the bottom of each pump cavity is provided with an air outlet, the partition plates are provided with interstage airflow channels, and the interstage airflow channels are communicated with the air outlet of the previous pump cavity and the air inlet of the next pump cavity.

Description

Multi-stage Roots vacuum pump with ventilating partition plate

Technical Field

The invention belongs to the technical field of Roots vacuum pumps, and particularly relates to a multi-stage Roots vacuum pump with a ventilating partition plate.

Background

The vacuum pump is widely applied to the industries of electronics, chemical engineering, textile and the like, different vacuum pumps or the combination of a plurality of vacuum pumps are adopted to obtain vacuum according to different use requirements, and the vacuum degree can reach 10-1Pa when the conventional mechanical pump is used for vacuumizing; therefore, under the condition that the requirement of the vacuum degree is not too high, a common mechanical pump can meet the requirement; in order to achieve a good pumping speed, vacuum limit and oilless property, a roots pump is generally adopted.

The Roots vacuum pump (Roots pump for short) is a variable displacement vacuum pump with two synchronously rotating vane-shaped rotors in opposite directions installed in the pump, and there are small gaps between the rotors and the inner wall of the pump casing without contacting each other.

For example, chinese patent application No. 2007100127591 discloses a multistage roots vacuum pump which discharges directly into the atmosphere. The pump is provided with a driving shaft, a driving rotor and a driven shaft, wherein the driving gear and the driving rotor are arranged on the driving shaft, the driven gear and the driven rotor are arranged on the driven shaft, the pump body adopts a multi-stage connection structure, a plurality of relatively independent pump cavities are formed along with different rotor stages, and every two pump cavities are separated by an inter-stage partition plate and are connected through an inter-stage airflow channel.

Wherein the interstage airflow channel sets up on the shell side of the pump body, and the shell includes casing and lower casing usually, and the two is fixed in the side through the bolt, and this just makes the thickness of shell need increase to guarantee to have interstage airflow channel simultaneously, also can be with the space of bolt fastening, the whole volume of shell is great, and occupation space is great.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the structure that the interstage airflow channel is arranged in the partition plate, the space of the side wall of the shell is not occupied, and the problem of larger integral volume caused by over-thick side wall of the shell can be avoided.

In order to realize the purpose, the invention provides the following technical scheme: a multi-stage Roots vacuum pump with a ventilating partition plate comprises a shell, wherein a plurality of partition plates are arranged in the shell, the partition plates divide the interior of the shell into a plurality of pump cavities, air inlets are formed in the tops of the pump cavities, air outlets are formed in the bottoms of the pump cavities, an interstage airflow channel is formed in each partition plate, and the interstage airflow channel is communicated with the air outlet of the previous pump cavity and the air inlet of the next pump cavity.

Furthermore, a first rotor and a second rotor are arranged in the shell, a shaft hole for the first rotor and the second rotor to pass through is formed in the partition plate, and the interstage airflow channel is located around the shaft hole.

The shell further comprises an upper shell and a lower shell which are connected at the side surface through a bolt.

Further, a first accommodating cavity communicated with the air inlet and the interstage airflow channel is arranged at the top of the upper shell.

And a second accommodating cavity communicated with the air outlet and the interstage airflow channel is further arranged at the bottom of the lower shell.

The first space that holds the chamber of further preceding is greater than the first space that holds the chamber of back, and the preceding second holds the space that the chamber was greater than the second space that holds the chamber of back.

Further the top that first holds the chamber is open, and the top of going up the casing is provided with last shrouding, and the second holds the bottom in chamber open, and the bottom of casing is provided with down the shrouding down.

Compared with the prior art, the invention has the beneficial effects that: the interstage airflow channel is arranged on the partition plate, so that the space of the side wall of the shell is not occupied, the side wall of the shell does not need to be thickened, the occupied space is reduced, and the problem of interference of the interstage airflow channel with bolts for fixing the upper shell and the lower shell is not additionally considered; meanwhile, the sizes of all the interstage airflow channels can be the same, the maximum airflow flux is guaranteed to be the same, and the vacuum pumping efficiency is improved.

Drawings

FIG. 1 is a first three-dimensional structure diagram of a multi-stage Roots vacuum pump with a ventilating partition plate according to the present invention;

FIG. 2 is a second perspective view of the diaphragm-ventilated multi-stage Roots vacuum pump of the present invention;

FIG. 3 is a side view of a diaphragm-vented multi-stage Roots vacuum pump of the present invention;

FIG. 4 isbase:Sub>A cross-sectional view taken at A-A of FIG. 3;

FIG. 5 is a top plan view of a diaphragm-vented multi-stage Roots vacuum pump of the present invention;

FIG. 6 is a cross-sectional view taken at B-B of FIG. 5;

FIG. 7 is a perspective view of the upper housing of the present invention;

fig. 8 is a perspective view of the lower case of the present invention.

Reference numerals: 1. a housing; 11. an upper housing; 111. a first accommodating chamber; 12. a lower housing; 121. a second accommodating cavity; 13. a pump cavity; 131. an air outlet; 132. an air inlet; 2. a partition plate; 21. a shaft hole; 22. an interstage gas flow path.

Detailed Description

Embodiments of the diaphragm-vented multi-stage roots vacuum pump of the present invention are further described with reference to fig. 1 to 8.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate that the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, a definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "a number" or "a number" means two or more unless explicitly specified otherwise.

A partition-ventilated multistage Roots vacuum pump comprises a housing 1, wherein a plurality of partitions 2 are arranged in the housing 1, the partitions 2 divide the interior of the housing 1 into a plurality of pump chambers 13, air inlets 132 are formed in the tops of the pump chambers 13, air outlets 131 are formed in the bottoms of the pump chambers 13, interstage airflow channels 22 are formed in the partitions 2, and the interstage airflow channels 22 are communicated with the air outlets 131 of the previous pump chamber 13 and the air inlets 132 of the next pump chamber 13.

As shown in fig. 4, in the present embodiment, there are five pump chambers 13, and each of the two adjacent pump chambers 13 has one partition plate 2 therebetween, that is, there are four partition plates 2, and the five pump chambers 13 are sequentially communicated by the inter-stage air flow passage 22.

As shown in fig. 3 and 6, a first rotor and a second rotor are further disposed in the casing 1, a shaft hole 21 is formed in the partition plate 2 for the first rotor and the second rotor to pass through, and the interstage airflow channel 22 is located around the shaft hole 21.

Typically, the inner wall of the casing 1 is curved to enable the rotor to be fitted to seal, the inter-stage gas flow path 22 does not intrude into the casing 1, the outermost side of the inter-stage gas flow path 22 extends substantially against the inner wall of the casing 1, and the innermost side does not communicate with the shaft hole 21, so as to increase the cross-sectional area of the inter-stage gas flow path 22 as much as possible.

The preferred housing 1 of this embodiment includes an upper housing 11 and a lower housing 12, and the upper housing 11 and the lower housing 12 are connected by bolts at the sides.

When the upper housing 11 is connected to the lower housing 12, the joint surface between the two can be sealed by disposing a gasket.

The top of the upper casing 11 of the preferred embodiment is provided with a first receiving chamber 111 communicating the inlet port 132 and the interstage airflow passage 22.

Further, the lower portion of the lower case 12 is provided with a second accommodation chamber 121 communicating the gas outlet 131 and the interstage gas flow passage 22.

As shown in fig. 1 and 2, the first receiving chamber 111 and the second receiving chamber 121 enable the interstage air flow passage 22 to transition between the two pump chambers 13 to achieve smooth air flow, and resistance can be reduced when the engine operates at high speed.

As shown in fig. 1 and 2, the space of the former first accommodating chamber 111 is larger than the space of the latter first accommodating chamber 111, and the space of the former second accommodating chamber 121 is larger than the space of the latter second accommodating chamber 121.

In order to maximize the space of the first accommodating chamber 111 and the second accommodating chamber 121, the first accommodating chamber 111 and the second accommodating chamber 121 are preferably the same as the pump chamber 13 in the axial direction.

In the preferred embodiment, the top of the first accommodating cavity 111 is open, the top of the upper housing 11 is provided with an upper sealing plate (not shown), the bottom of the second accommodating cavity 121 is open, and the bottom of the lower housing 12 is provided with a lower sealing plate (not shown).

The upper sealing plate seals the open top area of the upper housing 11 to separate the first accommodating chambers 111 independently, and the lower sealing plate seals the open bottom area of the lower housing 12 to separate the second accommodating chambers 121 independently.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The utility model provides a multistage roots vacuum pump that baffle was ventilated, includes the shell, is provided with a plurality of baffles in the shell, and the baffle is a plurality of pump chamber, its characterized in that with the inside separation of shell: the top of the pump cavity is provided with an air inlet, the bottom of the pump cavity is provided with an air outlet, the partition board is provided with an interstage airflow channel, and the interstage airflow channel is communicated with the air outlet of the previous pump cavity and the air inlet of the next pump cavity.

2. The diaphragm-vented multistage roots vacuum pump as claimed in claim 1, wherein: the casing is also internally provided with a first rotor and a second rotor, the partition plate is provided with a shaft hole for the first rotor and the second rotor to pass through, and the interstage airflow channel is positioned around the shaft hole.

3. The diaphragm-vented multistage roots vacuum pump of claim 2, wherein: the shell comprises an upper shell and a lower shell, and the upper shell and the lower shell are connected through bolts on the side surfaces.

4. The diaphragm-vented multistage roots vacuum pump of claim 3, wherein: the top of the upper shell is provided with a first accommodating cavity which is communicated with the air inlet and the interstage airflow channel.

5. The diaphragm-vented multistage roots vacuum pump of claim 4, wherein: and a second accommodating cavity communicated with the air outlet and the interstage airflow channel is formed at the bottom of the lower shell.

6. The diaphragm-vented multistage roots vacuum pump of claim 5, wherein: the space that the preceding first chamber that holds is greater than the space that the first chamber that holds of back, and the space that the preceding second held the chamber is greater than the space that the second held the chamber of back.

7. The diaphragm-vented multistage roots vacuum pump of claim 6, wherein: the top that the first chamber that holds is open, and the top of going up the casing is provided with last shrouding, and the second holds the bottom in chamber open, and the bottom of casing is provided with down the shrouding down.