CN116591954B

CN116591954B - Rotor assembly and pump body structure

Info

Publication number: CN116591954B
Application number: CN202310401947.2A
Authority: CN
Inventors: 张风港; 孟永见; 魏民
Original assignee: Beijing Tongjia Hongrui Technology Co ltd
Current assignee: Beijing Tongjia Hongrui Technology Co ltd
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-11-28
Anticipated expiration: 2043-04-14
Also published as: CN116591954A

Abstract

The application discloses a rotor assembly and a pump body structure, wherein the rotor assembly is applied to a stator cavity of the pump body structure, and the stator cavity is internally provided with an air inlet and an air outlet; the rotor assembly includes a first rotor including a first rotating arm and a second rotating arm, and a second rotor including a third rotating arm and a fourth rotating arm; the first rotating arm and the third rotating arm are arranged to be in a Roots structure, the second rotating arm and the fourth rotating arm are in a claw structure, and the gas of the gas inlet is pumped to the gas outlet through the cooperation of the first rotating arm and the third rotating arm and the cooperation of the second rotating arm and the fourth rotating arm; by providing both the Roots and claw structures on a single rotor, the rotor assembly of the present application has the advantages of both high compression and high pumping rates as compared to conventional single stage Roots and single stage claw rotors.

Description

Rotor assembly and pump body structure

Technical Field

The application relates to the technical field of vacuum pumps, in particular to a rotor assembly and a pump body structure.

Background

The dry vacuum pump comprises a pump cavity and a rotor, wherein the rotor rotates in the pump cavity and drives air in the pump cavity to flow so as to realize the function of pumping air by the vacuum pump.

A pair of rotors is provided in the conventional dry vacuum pump. Specifically, a pair of parallel transmission shafts are arranged in the pump cavity, and each rotation shaft is provided with one rotor, so that the two rotors are arranged side by side. The two rotors move in opposite directions, so that air at the air inlet is conveyed and compressed to the air outlet. The current rotors are structurally divided into claw rotors and Roots rotors, the Roots rotors have larger pumping speed, but the Roots rotors do not have compression ratio, and the claw rotors with good compression efficiency are matched for combined use.

Thus, how to provide a rotor with both high compression and high pumping rates is an urgent issue to be addressed at present.

Disclosure of Invention

The application aims to provide a rotor assembly and a pump body structure so as to solve the problem of how to avoid over-compression when a vacuum pump is exhausted.

The application adopts the following scheme for solving the technical problems.

In a first aspect, the present application provides a rotor assembly for use in a stator cavity of a pump body structure, the stator cavity having an air outlet and an air inlet therein, the rotor assembly comprising:

a first rotor for rotation within the stator cavity; the first rotor has a first rotating arm and a second rotating arm, the first rotating arm and the second rotating arm being disposed at an angle;

the second rotor is used for rotating in the stator cavity, and is arranged side by side with the first rotor, and the rotating direction of the second rotor is opposite to that of the first rotor; the second rotor has a third rotating arm and a fourth rotating arm, the third rotating arm and the fourth rotating arm being disposed at an angle;

the first rotating arm and the third rotating arm are of a Roots structure, the second rotating arm and the fourth rotating arm are of claw structures, the first rotating arm is matched with the third rotating arm, and the second rotating arm is matched with the fourth rotating arm so as to drive gas to be pumped between the gas inlet and the gas outlet.

In some embodiments of the present application, the second rotating arm has a first rotating position closing the air outlet, and when the second rotating arm is located at the first rotating position, the second rotating arm and the fourth rotating arm enclose to form a first cavity, and the first cavity is used for communicating with the air inlet and is used for sucking air from the air inlet;

wherein the second rotating arm has a first side surface, the first side surface being a side surface on which the second rotating arm approaches the fourth rotating arm when the second rotating arm moves to the first rotating position; the first side surface is at least partially raised along a first direction to form a raised structure, and the first direction is a direction in which the first side surface approaches the fourth rotating arm.

In some embodiments of the present application, the second rotating arm further has a second rotating position closing the air inlet, and when the second rotating arm is located at the second rotating position, the second rotating arm and the fourth rotating arm enclose to form a second cavity, and the second cavity is communicated with the air outlet; and the second rotating arm gradually reduces the volume of the second cavity in the process of approaching to the fourth rotating arm so as to compress the gas to the gas outlet.

In some embodiments of the application, the fourth arm has a second side, the second side being a side of the fourth arm that is adjacent to the second arm when the second arm is rotated to the second rotational position; the second side surface is at least partially recessed along the first direction to form a recessed structure.

In some embodiments of the present application, the second rotating arm is curved along a second direction, the second direction being a rotation direction of the first rotor; the fourth rotating arm is arranged in a bending mode along a third direction, and the third direction is opposite to the rotation direction of the second rotor.

In some embodiments of the application, the second rotor further comprises a fifth swivel arm, the fifth swivel arm extending in a direction opposite to the third swivel arm; the fifth rotating arm is in a Roots structure.

In some embodiments of the present application, the fifth rotating arm is disposed at an angle to the fourth rotating arm, and the angle between the fifth rotating arm and the fourth rotating arm is an acute angle.

In some embodiments of the application, the fifth swivel arm and the fourth swivel arm are integrally formed.

In a second aspect, the present application further provides a pump body structure, including the rotor assembly described above.

In some embodiments of the present application, the pump body structure is a vacuum pump, the pump body structure includes a stator cavity, and a plurality of rotor assemblies are disposed in the stator cavity.

The rotor assembly is applied to a stator cavity of the pump body structure, and the stator cavity is internally provided with an air inlet and an air outlet; the rotor assembly includes a first rotor including a first rotating arm and a second rotating arm, and a second rotor including a third rotating arm and a fourth rotating arm; the first rotating arm and the third rotating arm are arranged to be in a Roots structure, the second rotating arm and the fourth rotating arm are in a claw structure, and the gas of the gas inlet is pumped to the gas outlet through the cooperation of the first rotating arm and the third rotating arm and the cooperation of the second rotating arm and the fourth rotating arm; by providing both the Roots and claw structures on a single rotor, the rotor assembly of the present application has the advantages of both high compression and high pumping rates as compared to conventional single stage Roots and single stage claw rotors.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a rotor assembly according to an embodiment of the present application;

fig. 2 is a schematic structural view of a rotor assembly according to another embodiment of the present application.

Description of main reference numerals:

100-stator cavity, 200-first rotor, 210-first rotating arm, 220-second rotating arm, 221-first side, 300-second rotor, 310-third rotating arm, 320-fourth rotating arm, 321-second side, 330-fifth rotating arm, a-first direction, b-second direction, c-third direction.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application. In the description of the present application, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as exemplary in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be understood by those of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid unnecessarily obscuring the description of the application. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.

With the reintegration of the national resource structure, the development of vacuum pump equipment has become a necessary trend toward high quality and high efficiency. The vacuum pump comprises a pump cavity (serving as a stator cavity) and a rotor, wherein the rotor can rotate in the pump cavity, so that air on one side of the pump cavity flows to the other side of the pump cavity, and the function of pumping air by the vacuum pump is realized.

The rotor in the current vacuum pump is mostly a Roots rotor or a claw rotor. The Roots rotor has a large capacity and thus a large pumping speed, but the Roots rotor cannot compress gas, and therefore the Roots rotor does not have a compression ratio and needs to be combined with a claw rotor having a good compression efficiency. However, the individual claw rotors have a small volume and a small volume of pumped gas, resulting in a slow pumping rate.

The present application is based on this improvement of the current rotor assembly and pump body construction.

Referring first to fig. 1, fig. 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the application. The present embodiment provides a rotor assembly, which is applied in a stator cavity 100 of a pump body structure, and the stator cavity 100 has an air inlet and an air outlet. That is, the stator cavity 100 of the pump body structure is taken in through the air inlet and exhausted through the air outlet.

The rotor assembly includes a first rotor 200 and a second rotor 300. It will be appreciated that the first rotor 200 and the second rotor 300 are rotationally engaged for the purpose of air intake and exhaust. Specifically, the first rotor 200 is configured to rotate within the stator cavity 100. The first rotor 200 has a first rotating arm 210 and a second rotating arm 220, the first rotating arm 210 and the second rotating arm 220 being disposed at an angle. That is, the first rotor 200 can rotate and drive the first and second rotating arms 210 and 220, and the gas in the stator cavity 100 is driven to move by the first and second rotating arms 210 and 220, so that the gas flows from the gas inlet to the gas outlet. It will be appreciated that the first and second arms 210, 220 are disposed at an angle so that a cavity can be formed therebetween, which cavity can be used to carry gas.

The second rotor 300 is configured to rotate in the stator cavity 100, and the second rotor 300 is disposed side by side with the first rotor 200, and the rotation direction of the second rotor 300 is opposite to the rotation direction of the first rotor 200. The second rotor 300 has a third rotating arm 310 and a fourth rotating arm 320, the third rotating arm 310 and the fourth rotating arm 320 being disposed at an angle. That is, the first and second rotors 200 and 300 are rotated in opposite directions, and during this process, the first and third rotary arms 210 and 310, the second and fourth rotary arms 220 and 320 are brought close to and separated from each other, and thus perform a circulating motion.

It can be appreciated that the second rotor 300 rotates the third rotating arm 310 and the fourth rotating arm 320 during the rotation of the stator cavity, and the gas in the stator cavity 100 is driven to move by the third rotating arm 310 and the fourth rotating arm 320, so that the gas flows from the gas inlet to the gas outlet.

Wherein the first rotating arm 210 and the third rotating arm 310 are of a Roots structure, and the second rotating arm 220 and the fourth rotating arm 320 are of a claw structure. The first and third rotating arms 210, 310 cooperate, and the second and fourth rotating arms 220, 320 cooperate to drive the gas to be pumped between the gas inlet and the gas outlet.

It will be appreciated that the Roots structure may be a rotor structure in a Roots vacuum pump. The claw structure may be a rotor structure in a claw vacuum pump. It should be noted that, during the rotation, the air between the first rotating arm 210 and the third rotating arm 310 can be compressed when they are close to each other, and the air can be absorbed to the outside when the first rotating arm 210 and the third rotating arm 310 are far away from each other. Similarly, the second and fourth rotating arms 220 and 320 can compress air therebetween when they are close to each other, and the second and fourth rotating arms 220 and 320 can absorb air to the outside when they are far from each other.

In other words, the first and third rotary arms 210 and 310 form a first air supply mechanism, and the second and fourth rotary arms 220 and 320 form a second air supply mechanism. As the first rotor 200 and the second rotor 300 rotate, the first air feeding mechanism of the roots structure and the second air feeding mechanism of the claw structure alternately pump air to the air outlet.

The rotors in the current vacuum pumps are classified into roots rotors and claw rotors, and the roots rotors and the claw rotors are commonly used in combination. However, in the present application, the first and third rotating arms 210 and 310 are provided in a Roots structure, the second and fourth rotating arms 220 and 320 are provided in a claw structure, and the gas of the gas inlet is pumped to the gas outlet by the cooperation of the first and third rotating arms 210 and 310 and the cooperation of the second and fourth rotating arms 220 and 320; by providing both the Roots and claw structures on a single rotor, the rotor assembly of the present application has the advantages of both high compression and high pumping rates as compared to conventional single stage Roots and single stage claw rotors.

In some embodiments of the present application, please continue to refer to fig. 1, the second rotating arm 220 in this embodiment has a first rotating position closing the air outlet, and when the second rotating arm 220 is located at the first rotating position, the second rotating arm 220 and the fourth rotating arm 320 enclose to form a first cavity, and the first cavity is used for communicating with the air inlet and for sucking air from the air inlet.

That is, the second and fourth rotating arms 220 and 320 can be enclosed with the inner wall of the stator cavity 100 to form a first cavity when they are close to each other, and the interval between the second and fourth rotating arms 220 and 320 is gradually increased to suck the gas in the gas inlet into the first cavity by the negative pressure in the first cavity.

Specifically, the second rotating arm 220 has a first side 221, and the first side 221 is a side of the second rotating arm 220 that approaches the fourth rotating arm 320 when the second rotating arm 220 moves to the first rotating position; the first side 221 is at least partially protruded along a first direction a, which is a direction in which the first side 221 approaches the fourth rotating arm 320, to form a protruded structure. It should be explained that the protrusion structure can reduce the volume of the first cavity, and when sucking gas, a larger negative pressure difference is formed between the protrusion structure and the gas of the gas inlet, so as to improve the sucking efficiency.

In some embodiments of the present application, referring to fig. 2, fig. 2 shows a schematic structural diagram of a rotor assembly according to the present embodiment. The second rotating arm 220 of the present embodiment further has a second rotating position for closing the air inlet, and when the second rotating arm 220 is located at the second rotating position, the second rotating arm 220 and the fourth rotating arm 320 enclose to form a second cavity, and the second cavity is communicated with the air outlet. And the second rotating arm 220 gradually reduces the volume of the second chamber during approaching the fourth rotating arm 320 to compress the gas to the gas outlet.

That is, the second rotating arm 220 and the second rotating arm 220 can form a second chamber for compressed gas, that is, a function of a conventional claw rotor. The claw type rotor is not required to drive gas to move.

In some embodiments of the present application, the fourth rotating arm 320 has a second side 321, and the second side 321 is a side of the fourth rotating arm 320 adjacent to the second rotating arm 220 when the second rotating arm 220 rotates to the second rotating position. The second side 321 is at least partially recessed along the first direction a to form a recessed structure.

It will be appreciated that the recessed feature can expand the volume of the second cavity. In the traditional rotor structure, because the volume of the exhaust cavity is smaller, the exhaust is easy to over-compress, and the problems of low exhaust efficiency, over-temperature exhaust gas and the like are caused. However, in this embodiment, by disposing the concave structure on the second side 321 of the fourth rotating arm 320, the volume of the second cavity can be reduced, which is beneficial to reducing the compression degree of the second cavity on the gas, so as to avoid the problem of low exhaust efficiency caused by over-compressing the air.

In some embodiments of the present application, please continue to refer to fig. 1, the second rotating arm 220 in this embodiment is curved along the second direction b, which is the rotation direction of the first rotor 200, so as to facilitate compressing the gas. The fourth rotating arm 320 is curved along a third direction c, which is opposite to the rotation direction of the second rotor 300, facilitating suction from the air inlet.

In some embodiments, the angle between the first rotating arm 210 and the second rotating arm 220 is a first angle, which is an obtuse angle.

In some embodiments, the angle between the third arm 310 and the fourth arm 320 is a second angle, the second angle is an obtuse angle, and the second angle is less than the first angle.

In some embodiments of the present application, referring to fig. 1, the second rotor 300 in the present embodiment further includes a fifth rotating arm 330, and the extending direction of the fifth rotating arm 330 is opposite to that of the third rotating arm 310; the fifth rotating arm 330 is of a Roots type structure. That is, the fifth rotating arm 330 of Roots structure is added to the second rotor 300, which is beneficial to improving the pumping rate of the rotor assembly.

In some embodiments of the present application, please continue to refer to fig. 2, the fifth rotating arm 330 and the fourth rotating arm 320 are disposed at an included angle, and the included angle between the fifth rotating arm 330 and the fourth rotating arm 320 is an acute angle. It will be appreciated that a cavity structure can be formed between the fifth swivel arm 330 and the fourth swivel arm 320, which cavity structure can also function to pump gas.

In some embodiments of the present application, please continue to refer to fig. 1, the fifth rotating arm 330 and the fourth rotating arm 320 are integrally formed, which is beneficial to improving the stability of the overall structure, and the integral structure is beneficial to reducing the difficulty of disassembly and assembly.

Further, in order to better implement the rotor assembly in the embodiment of the present application, the present application further provides a pump body structure based on the rotor assembly, where the pump body structure includes the rotor assembly in any of the above embodiments.

Specifically, the pump body structure includes a stator cavity 100, a first rotating shaft and a second rotating shaft parallel to each other are disposed in the stator cavity 100, the first rotor 200 rotates on the first rotating shaft, and the second rotor 300 rotates on the second rotating shaft. That is, the first rotor 200 has a first rotation point, which falls on the first rotation shaft; the second rotor 300 has a second rotation point, which falls in the first rotation axis.

In some embodiments of the present application, the pump body structure in this embodiment is a vacuum pump, and the pump body structure includes a stator cavity 100, and a plurality of rotor assemblies are disposed in the stator cavity 100. That is, a different number of rotor assemblies can be selectively installed according to the pumping requirements of the vacuum pump.

It is understood that the distance between the first rotor 200/second rotor 300 and the inner wall of the stator cavity 100 is the distance between the position of the first rotating arm 210/second rotating arm 220 closest to the inner wall and the inner wall.

In some embodiments, the pump body structure is a vacuum pump. In a further embodiment, the vacuum pump is a claw vacuum pump.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the application may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present application uses specific words to describe embodiments of the present application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject application. Indeed, less than all of the features of a single embodiment disclosed above.

Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety except for any application history file that is inconsistent or otherwise conflict with the present disclosure, which places the broadest scope of the claims in this application (whether presently or after it is attached to this application). It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this application if the description, definition, and/or use of the term in the appended claims does not conform to or conflict with the present disclosure.

The foregoing has outlined the detailed description of the embodiments of the present application, and the detailed description of the principles and embodiments of the present application is provided herein by way of example only to facilitate the understanding of the method and core concepts of the present application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the present description should not be construed as limiting the present application in summary.

Claims

1. A rotor assembly for use in a stator cavity of a pump body structure, the stator cavity having an air outlet and an air inlet therein, the rotor assembly comprising:

2. The rotor assembly of claim 1 wherein the second swivel arm has a first rotational position closing the air outlet and wherein when the second swivel arm is in the first rotational position, the second swivel arm encloses a first cavity with the fourth swivel arm, the first cavity being for communicating with the air inlet and for drawing air from the air inlet;

3. The rotor assembly of claim 2 wherein the second swivel arm further has a second rotational position closing the air inlet, and wherein when the second swivel arm is in the second rotational position, the second swivel arm encloses with the fourth swivel arm to form a second cavity, the second cavity communicating with the air outlet; and the second rotating arm gradually reduces the volume of the second cavity in the process of approaching to the fourth rotating arm so as to compress the gas to the gas outlet.

4. A rotor assembly as claimed in claim 3, wherein the fourth arm has a second side which is a side of the fourth arm adjacent the second arm when the second arm is rotated to the second rotational position; the second side surface is at least partially recessed along the first direction to form a recessed structure.

5. A rotor assembly according to claim 3, wherein the second swivel arm is arranged curved in a second direction, the second direction being the direction of rotation of the first rotor; the fourth rotating arm is arranged in a bending mode along a third direction, and the third direction is opposite to the rotation direction of the second rotor.

6. The rotor assembly of claim 1, wherein the second rotor further comprises a fifth swivel arm extending in a direction opposite to the third swivel arm; the fifth rotating arm is in a Roots structure.

7. The rotor assembly of claim 6 wherein the fifth rotating arm is disposed at an angle to the fourth rotating arm and the angle between the fifth rotating arm and the fourth rotating arm is an acute angle.

8. The rotor assembly of claim 6 wherein the fifth rotating arm is of unitary construction with the fourth rotating arm.

9. Pump body structure, characterized by comprising a rotor assembly according to any one of claims 1 to 8.

10. The pump body structure of claim 9, wherein the pump body structure is a vacuum pump, the pump body structure comprises a stator cavity, and a plurality of the rotor assemblies are disposed in the stator cavity.