CN214577725U

CN214577725U - Flange for electronic vacuum pump and electronic vacuum pump

Info

Publication number: CN214577725U
Application number: CN202120354558.5U
Authority: CN
Inventors: 高建宏; 范前高; 刘瑞庭
Original assignee: Hella Shanghai Electronics Co Ltd
Current assignee: Hella Shanghai Electronics Co Ltd
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-11-02
Anticipated expiration: 2031-02-08

Abstract

The utility model provides a flange for an electronic vacuum pump and an electronic vacuum pump, the flange is used for connecting an electronic vacuum pump body and a pump cover, an air inlet pipe and an exhaust pipe of the electronic vacuum pump are arranged on the flange, and an upper cavity, a middle channel and a lower cavity are sequentially arranged on the inner side of the exhaust pipe along the air flow discharge direction; the flow area of the upper chamber is larger than the flow area of the intermediate channel; the flow area of the intermediate passage is smaller than the flow area of the lower chamber. After the technical scheme is adopted, the electronic vacuum pump can be silenced through the exhaust pipe without arranging an additional silencer, so that the vacuum pump assembly process is simplified, and the overall cost of a product is reduced.

Description

Flange for electronic vacuum pump and electronic vacuum pump

Technical Field

The utility model relates to an electron vacuum pump technical field especially relates to a flange and an electron vacuum pump for electron vacuum pump.

Background

An electronic vacuum pump is a device for providing a vacuum boosting source for an automobile brake auxiliary system. Acoustic performance is one of the important parameter indicators. Certain exhaust airflow noise can be generated when the vacuum pump operates, the NVH performance of the whole automobile and the driving experience of customers can be influenced, and at present, OEM manufacturers have higher and higher requirements on noise control, and especially new energy automobiles are particularly strict.

The electronic vacuum pump drives the blades to rotate through the motor so that the volume of the inner cavity changes circularly, and therefore the compression process of the sucked air is completed. In the process of air suction and compression, air collides and rubs with wall surfaces of parts of an inner cavity and is finally discharged through an exhaust pipe, and large noise is generated during discharge, so that the NVH (noise, vibration and sound vibration roughness) performance of a vehicle cannot meet the requirement, and the riding experience of a driver and passengers in the vehicle is further influenced.

In the prior art, a separate silencer is usually arranged outside an exhaust pipe and is connected with the exhaust pipe to reduce noise generated when air flow is exhausted. However, the provision of a separate muffler requires a production line for the vacuum pump assembly to increase the number of assembly processes and equipment, and the muffler itself requires a certain cost, so that the cost of the vacuum pump as a whole is increased.

Therefore, it is required to develop a flange for an electronic vacuum pump and an electronic vacuum pump having the same, which are low in cost and can effectively muffle the exhaust gas of the vacuum pump.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technical defect, the utility model aims to provide a cost is lower and can carry out the flange that is used for electron vacuum pump of effective amortization and the electron vacuum pump that has this flange to the vacuum pump exhaust.

The utility model discloses a flange for an electronic vacuum pump, which is used for connecting an electronic vacuum pump body and a pump cover, an air inlet pipe and an air outlet pipe of the electronic vacuum pump are arranged on the flange,

the inner side of the exhaust pipe is sequentially provided with an upper cavity, a middle channel and a lower cavity along the airflow discharge direction;

the flow area of the upper chamber is larger than the flow area of the intermediate channel;

the flow area of the intermediate passage is smaller than the flow area of the lower chamber.

Preferably, a transition section is arranged between the upper chamber and the middle channel;

the flow area of the transition section decreases uniformly from the upper chamber to the intermediate passage.

Preferably, the upper chamber, the intermediate passage and the lower chamber are all cylindrical in shape.

Preferably, the ratio of the flow area of the upper chamber to the flow area of the middle channel is 2.5-3.5;

the ratio of the flow area of the lower cavity to the flow area of the middle channel is 3-7.

Preferably, the ratio of the length of the upper chamber to the length of the middle channel is 1.5-2.5;

the ratio of the length of the lower cavity to the length of the middle channel is 2-3.

Preferably, the ratio of the length of the upper chamber to the length of the intermediate channel is 2;

the ratio of the length of the lower chamber to the length of the intermediate channel is 2.5.

Preferably, the diameter of the middle channel is 1.5-4 mm.

Preferably, the upper chamber is in a circular truncated cone shape, and the flow area of the upper chamber is gradually reduced from the side far away from the middle channel to the side close to the middle channel;

the lower cavity is in a circular truncated cone shape, and the flow area of the lower cavity is gradually increased from the side close to the middle channel to the side far away from the middle channel.

Preferably, the exhaust pipe is integrally formed with the flange.

The utility model also discloses an electron vacuum pump, including electron vacuum pump body, pump cover and as above the flange.

After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:

1. exhaust airflow rapidly enters the middle channel through the upper chamber, high-speed airflow molecules, the pipe wall and the pipe are collided and rubbed with each other due to the sudden reduction of the flow area, partial kinetic energy is converted into heat energy so as to offset certain sound energy, and meanwhile partial sound waves are reflected back due to the sudden change of the cross section, and partial sound energy is also consumed; the airflow in the pipe rapidly flows into the lower cavity from the middle channel, and the acoustic resistance is reduced due to the sudden increase of the flow area, and the airflow sound is reduced again and discharged outdoors, so that the exhaust pipe can effectively perform noise reduction, and the NVH performance of the whole vehicle is improved;

2. the cost of configuring a separate silencer is reduced, the assembly process and equipment are simplified, and the overall cost of the electronic vacuum pump is obviously reduced.

Drawings

FIG. 1 is a schematic diagram of an electronic vacuum pump according to an embodiment of the present disclosure;

fig. 2 is a cross-sectional view of the flange of fig. 1 at the exhaust pipe.

Reference numerals:

the vacuum pump comprises a main body of the electronic vacuum pump, 2-a pump cover, 3-a flange, 31-an exhaust pipe, 311-an upper chamber, 312-a middle channel, 313-a lower chamber, 314-a transition section, 32-an air inlet pipe and 4-a power supply connector.

Detailed Description

The advantages of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.

In the following description, suffixes such as "module", "part", or "unit" used to indicate elements are used only for the convenience of description of the present invention, and have no specific meaning in itself. Thus, "module" and "component" may be used in a mixture.

Referring to fig. 1, a schematic structural diagram of an electronic vacuum pump in an embodiment of the present application is shown, where the vacuum pump includes a vacuum pump body 1, a pump cover 2, and a flange 3, and the electronic vacuum pump body 1 and the pump cover 2 are connected by the flange 3. The electronic vacuum pump body 1 comprises a motor, a rotor, a blade and the like, and the structure of the electronic vacuum pump body is well known to those skilled in the art and will not be described in detail herein. The flange 3 is provided with an inlet pipe 32 and an outlet pipe 31. In this embodiment, the flange 3 is further connected with a power connector 4. Preferably, the exhaust pipe 31 is integrally formed with the flange 3, and the material thereof may be plastic or metal.

Referring to fig. 2, the exhaust pipe 31 is provided with an upper chamber 311, a middle passage 312 and a lower chamber 313 in this order along the gas flow discharge direction; the flow area of the upper chamber 311 is larger than the flow area of the intermediate passage 312; the flow area of the intermediate passage 312 is smaller than the flow area of the lower chamber 313.

Specifically, in this embodiment, the upper chamber 311, the middle passage 312, and the lower chamber 313 are all cylindrical in shape, and the flow area is the cross-sectional area of the chambers and passages. Preferably, the ratio of the flow area of the upper chamber 311 to the flow area of the middle channel 312 is 2.5-3.5; the ratio of the flow area of the lower chamber 313 to the flow area of the middle channel 312 is 3-7. Preferably, the ratio of the length of the upper chamber 311 to the length of the middle channel 312 is 1.5-2.5; the ratio of the length of the lower chamber 313 to the length of the middle channel 312 is 2-3. Further preferably, the ratio of the length of the upper chamber 311 to the length of the middle channel 312 is 2; the ratio of the length of the lower chamber 313 to the length of the intermediate channel 312 is 2.5. Preferably, the diameter of the middle channel 312 is 1.5-4 mm.

In the present embodiment, a transition section 314 is disposed between the upper chamber 311 and the middle channel 312, and a flow area of the transition section 314 is uniformly reduced from the upper chamber 311 to the middle channel 312. That is, in this embodiment, the upper chamber 311 and the middle passage 312 are uniformly transited through an inclined surface, and the arrangement of the inclined surface can make the airflow flow more smoothly, thereby reducing the vibration caused by the airflow impact to a certain extent. It should be noted, however, that the length of the transition section 314 is much less than the length of the upper chamber 311 and the intermediate passage 312, so that the slope of the transition section 314 is sufficiently large. In other embodiments, the transition section 314 may not be provided, and the upper chamber 311 and the middle channel 312 are transited by a straight surface.

In other embodiments, the upper chamber 311 may have a truncated cone shape, and the flow area of the upper chamber 311 gradually decreases from the side away from the middle channel 312 to the side close to the middle channel 312; the lower chamber 313 may have a truncated cone shape, and a flow area of the lower chamber 313 gradually increases from a side close to the middle passage 312 to a side far from the middle passage 312. The intermediate passage 312 may be cylindrical in shape. At this time, the flow area of the upper chamber 311 and the lower chamber 313 is the cross-sectional area of the end surfaces of the upper chamber 311 and the lower chamber 313 on the side close to the intermediate passage 312. The ratios of the flow area and the length of the upper chamber 311, the lower chamber 313 and the intermediate passage 312 can be found in the above embodiments.

According to the electronic vacuum pump, external air flows into a vacuum pump cavity from the air inlet pipe 32 and is continuously compressed by the blades and then discharged from the exhaust pipe 31 at a high speed, exhaust airflow rapidly enters the middle channel 312 from the upper cavity 311, high-speed airflow molecules, pipe walls and pipes collide with each other and rub with each other due to sudden reduction of the flow area, partial kinetic energy is converted into heat energy so as to offset certain sound energy, and meanwhile partial sound waves are reflected back due to sudden change of the cross section and are also consumed; the air flow in the tube rapidly flows into the lower chamber 313 from the middle passage 312, and the sound of the air flow is again reduced and discharged because the acoustic resistance is reduced due to the sudden increase of the flow area. Thereby the blast pipe 31 of this application can effectively carry out the amortization, promotes the NVH performance of whole car. Because the exhaust pipe 31 can effectively reduce noise, the NVH performance of the whole vehicle is improved, an independent silencer does not need to be arranged outside the exhaust pipe 31, the cost for arranging the independent silencer is reduced, the assembling process and equipment are simplified, and the overall cost of the electronic vacuum pump is obviously reduced.

It should be noted that the embodiments of the present invention have better practicability and are not intended to limit the present invention in any way, and any person skilled in the art may change or modify the technical contents disclosed above to equivalent effective embodiments, but all the modifications or equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A flange for an electronic vacuum pump is used for connecting an electronic vacuum pump body and a pump cover, an air inlet pipe and an air outlet pipe of the electronic vacuum pump are arranged on the flange, and the flange is characterized in that,

2. The flange according to claim 1,

a transition section is arranged between the upper cavity and the middle channel;

3. The flange according to claim 1,

the upper chamber, the intermediate passage and the lower chamber are all cylindrical in shape.

4. A flange according to claim 3,

the ratio of the flow area of the upper cavity to the flow area of the middle channel is 2.5-3.5;

5. A flange according to claim 3,

the ratio of the length of the upper cavity to the length of the middle channel is 1.5-2.5;

6. The flange according to claim 5,

the ratio of the length of the upper chamber to the length of the intermediate channel is 2;

7. A flange according to claim 3,

the diameter of the middle channel is 1.5-4 mm.

8. The flange according to claim 1,

the upper cavity is in a circular truncated cone shape, and the flow area of the upper cavity is gradually reduced from one side far away from the middle channel to one side close to the middle channel;

9. The flange according to claim 1,

the exhaust pipe and the flange are integrally formed.

10. An electronic vacuum pump comprising an electronic vacuum pump body, a pump cover and a flange according to any one of claims 1 to 9.