Pressure relief mechanism and vacuum pump

Abstract

The utility model discloses a pressure relief mechanism and a vacuum pump, the pressure relief mechanism comprises a pump shell and a pressure relief assembly, the pump shell is internally provided with a gas chamber and a pressure relief channel which are communicated with each other; the pressure relief assembly is arranged in the pressure relief channel and moves along with the change of the pressure in the gas chamber, so that the gas chamber and the pressure relief channel are mutually communicated or mutually closed, when the pressure in the gas chamber is larger than a preset value, the pressure relief assembly moves towards the pressure relief channel, and when the pressure in the gas chamber is larger than the preset value, the gas chamber and the pressure relief channel are communicated or closed. Therefore, the gas chamber and the pressure relief channel are communicated with each other. The pressure and the flow can be kept stable when gas is output, and the stability of the vacuum pump in the operation process is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum pump technical field, concretely relates to a pressure release mechanism and vacuum pump. BACKGROUND

[0002] Vacuum pump is widely used in the process of pumping and gas transmission, and is an indispensable gas transmission device, for example, Roots vacuum pump, etc., in the related art, the existing vacuum pump when running, if the gas chamber in its interior is too high, it is difficult to keep the pressure and flow stable when outputting gas, so that the running stability of vacuum pump is insufficient. SUMMARY

[0003] The utility model aims at at least in a certain extent solve one of the technical problems in the related art, for this purpose, one purpose of the utility model is to propose a pressure release mechanism, comprising:

[0004] Pump shell, the pump shell has the gas chamber and the pressure release channel that communicate with each other in it;

[0005] Pressure release assembly, the pressure release assembly is located in the pressure release channel, and moves with the pressure change in the gas chamber to make the gas chamber and the pressure release channel communicate with each other or close to each other, when the pressure in the gas chamber is greater than the external pressure, the pressure release assembly moves towards the pressure release channel, so that the gas chamber and the pressure release channel communicate with each other.

[0006] Preferably, the gas chamber is composed of a plurality of rotor cavities, and the pressure release channel is connected to at least two rotor cavities.

[0007] Preferably, the pressure release channel comprises:

[0008] Access channel, at least two access channels are connected with at least two rotor cavities respectively;

[0009] Connection channel, the connection channel connects at least two access channels;

[0010] Discharge channel, the discharge channel is connected to the access channel and the connection channel, so that when the gas chamber and the access channel communicate, the gas in the gas chamber is discharged through the discharge channel.

[0011] Preferably, the access channel is configured as a funnel structure.

[0012] Preferably, the inlet diameter of the access channel is smaller than the outlet diameter of the access channel.

[0013] Preferably, the pump shell has an air inlet channel, and the air inlet channel is connected to the discharge channel and the gas chamber respectively.

[0014] Preferably, the pressure relief assembly comprises:

[0015] A pressure relief ball is arranged in the access channel and moves in the access channel with the pressure change in the gas chamber;

[0016] An adjusting member is screwed in the access channel to limit the position of the pressure relief ball.

[0017] Preferably, the diameter of the pressure relief ball is greater than the inlet diameter of the access channel and less than the outlet diameter of the access channel.

[0018] Another purpose of the present application is to provide a vacuum pump comprising the pressure relief mechanism as described above.

[0019] The above scheme of the present application has at least the following advantages:

[0020] The pressure relief mechanism provided by the present application can make the gas in the gas chamber be discharged from the pressure relief channel when the pressure in the gas chamber is too large and exceeds the preset value, so that the pressure and flow rate of the output gas can be kept stable, and the stability of the operation process of the vacuum pump is improved.

[0021] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from the structures shown in these drawings without creative labor.

[0023] Figure 1 is a structural schematic view of the pressure relief mechanism provided in the embodiments of the present application;

[0024] Figure 2 is another structural schematic view of the pressure relief mechanism provided in the embodiments of the present application;

[0025] Figure 3 is Figure 2 the A-A sectional view shown in the figure;

[0026] EXPLANATION OF REFERENCE NUMBERS:

[0027] 10, pump housing; 11, gas chamber; 12, pressure relief passage; 121, access passage; 122, connecting passage; 123, discharge passage; 13, gas inlet passage; 20, pressure relief assembly; 21, adjusting member; 22, pressure relief ball.

[0028] The realization, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application belong to the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside 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.

[0033] In the utility model, unless another definite provision and limitation, first feature is in second feature "on" or "under" can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature is on, above and on of second feature includes that first feature is directly above and obliquely above of second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature is below, under and under of second feature includes that first feature is directly below and obliquely below of second feature, or only indicates that horizontal height of first feature is less than second feature.

[0034] The pressure relief mechanism and the vacuum pump are described in detail below with reference to the drawings.

[0035] Referring to Figures 1 to 3 The pressure relief mechanism provided in the utility model embodiment includes a pump shell 10 and a pressure relief assembly 20, the pump shell 10 has a gas chamber 11 and a pressure relief channel 12 that are in communication with each other, and the pressure relief assembly 20 is arranged in the pressure relief channel 12 and moves with the change of pressure in the gas chamber 11 to mutually open or close the gas chamber 11 and the pressure relief channel 12, and when the pressure in the gas chamber 11 is greater than a preset value, the pressure relief assembly 20 moves towards the pressure relief channel 12 to mutually open the gas chamber 11 and the pressure relief channel 12.

[0036] The pressure relief mechanism provided in the utility model can make the gas in the gas chamber 11 be discharged from the pressure relief channel 12 when the pressure in the gas chamber 11 is too large and exceeds the preset value, so that the pressure and flow rate of the output gas can be kept stable, and the stability of the operation process of the vacuum pump is improved.

[0037] Specifically, the gas chamber 11 is composed of a plurality of rotor cavities, and the pressure relief channel 12 is connected to at least two rotor cavities. The rotor can rotate in the rotor cavity to complete the work of gas pumping and gas conveying, and when the pressure in the gas chamber 11 is too high, the pressure relief channel 12 can be used for pressure relief. It can be understood that the preset value can be set according to actual needs, for example, when the pressure in the gas chamber 11 can be greater than the external pressure, the pressure relief assembly 20 can mutually open the gas chamber 11 and the pressure relief channel 12.

[0038] Specifically, the pressure relief channel 12 comprises: access channels 121, a connecting channel 122 and a discharge channel 123. The at least two access channels 121 are respectively connected with the at least two rotor cavities. The connecting channel 122 connects the at least two access channels 121 in communication. The discharge channel 123 is in common communication with the access channels 121 and the connecting channel 122, so that when the gas cavity chamber 11 is in communication with the access channels 121, the gas in the gas cavity chamber 11 is discharged through the discharge channel 123.

[0039] In the embodiment, when the gas pressure in the gas cavity chamber 11 is too high, the gas can push the pressure relief assembly 20 to move, so that the pressure relief channel 12 and the gas cavity chamber 11 are in communication, and then the gas in the gas cavity chamber 11 is discharged from the pressure relief channel 12, so that the pressure in the gas cavity chamber 11 is more stable.

[0040] As a preferred embodiment, the access channel 121 is configured as a funnel structure, and the inlet diameter of the access channel 121 is smaller than the outlet diameter of the access channel 121. When the gas pressure in the gas cavity chamber 11 is too high, the pressure relief assembly 20 opens the inlet of the access channel 121, so that the gas in the gas cavity chamber 11 is discharged through the access channel 121, the connecting channel 122 and the discharge channel 123.

[0041] In an alternative embodiment, the pump housing 10 has an air inlet channel 13, which is in communication with the discharge channel 123 and the gas cavity chamber 11, respectively. When the gas cavity chamber 11 is in the air inlet, the gas can enter through the air inlet channel 13, and also enter a part from the pressure relief channel 12, so that the gas pushes the pressure relief assembly 20 to close the inlet of the access channel 121. After closing the access channel 121, the gas enters the gas cavity chamber 11 from the air inlet channel 13, thereby completing the work of gas pumping and gas conveying.

[0042] Specifically, the pressure relief assembly 20 comprises: a pressure relief ball 22 and an adjusting piece 21. The pressure relief ball 22 is arranged in the access channel 121 and moves in the access channel 121 with the change of the pressure in the gas cavity chamber 11. The adjusting piece 21 is threadedly connected in the access channel 121 to close and limit the pressure relief ball 22.

[0043] In the embodiment, since the access channel 121 is in a funnel structure, the pressure relief ball 22 can move in the access channel 121, and the access channel 121 is opened or closed according to the size of the air pressure, optionally, the space in the access channel 121 can be adjusted by the adjusting member 21, so that the pressure and flow of the output gas can be adjusted, the output gas is more stable, and the pressure in the gas chamber 11 is more stable; it can be understood that the diameter of the pressure relief ball 22 is greater than the inlet diameter of the access channel 121 and less than the outlet diameter of the access channel 121, so that the access channel 121 can be opened or closed with the pressure relief channel 12.

[0044] The vacuum pump provided in the embodiment of the utility model, comprising the pressure relief mechanism as described above. Wherein, the vacuum pump through adopting the pressure relief mechanism as described above, if the air pressure in the gas chamber 11 is too large and exceeds the preset value during the operation of the vacuum pump, the pressure relief assembly 20 will move with the air pressure in the gas chamber 11, and then the gas chamber 11 and the pressure relief channel 12 are mutually conducted, so that the gas in the gas chamber 11 can be discharged from the pressure relief channel 12, and then the pressure and flow of the output gas can be kept stable, and the stability of the operation of the vacuum pump is improved.

[0045] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the characteristics of the different embodiments or examples without contradiction.

[0046] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by the utility model specification and the drawings contents, or direct / indirect application in other related technical fields under the utility model concept of the utility model are included in the patent protection range of the utility model.

Claims

1. A pressure relief mechanism, characterized by, The pressure relief mechanism comprises: a pump housing having a gas chamber and a pressure relief passage in communication with each other; a pressure relief assembly arranged in the pressure relief passage and moving with the pressure change in the gas chamber to open or close the gas chamber and the pressure relief passage, wherein the pressure relief assembly moves towards the pressure relief passage to open the gas chamber and the pressure relief passage when the pressure in the gas chamber is greater than a preset value.

2. The pressure relief mechanism of claim 1, wherein The gas chamber is composed of a plurality of rotor cavities, and the pressure relief passage is connected to at least two rotor cavities.

3. The pressure relief mechanism of claim 2, wherein, The pressure relief passage comprises: access passages connected to at least two rotor cavities respectively; a connecting passage connecting the access passages; an exhaust passage in common communication with the access passages and the connecting passage to exhaust the gas in the gas chamber through the exhaust passage when the gas chamber and the access passages are in communication.

4. The pressure relief mechanism of claim 3, wherein, The access passage is configured as a funnel structure.

5. The pressure relief mechanism of claim 4, wherein, The inlet diameter of the access passage is smaller than the outlet diameter of the access passage.

6. The pressure relief mechanism of claim 3, wherein, The pump housing has an air inlet passage in communication with the exhaust passage and the gas chamber respectively.

7. The pressure relief mechanism of claim 5, wherein, The pressure relief assembly comprises: a pressure relief ball arranged in the access passage and moving in the access passage with the pressure change in the gas chamber; an adjusting member threadedly connected in the access passage to limit the position of the pressure relief ball.

8. The pressure relief mechanism of claim 7, wherein, The diameter of the pressure relief ball is greater than the inlet diameter of the access passage and smaller than the outlet diameter of the access passage.

9. A vacuum pump, characterized by The pressure relief mechanism comprises any one of claims 1 to 8.

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