Noise reduction waterproof cap and air outlet groove for electronic vacuum pump to reduce noise of electronic vacuum pump

Abstract

The present invention relates to a noise reduction and waterproof cap for an electronic vacuum pump and an electronic vacuum pump with noise reduction in an air outlet groove. The noise reduction and waterproof cap replaces the hood-type structure of the prior art with a structure that is approximately flat, which not only reduces the volume and saves the space occupied by the air outlet groove; but also divides the space of the air outlet groove by a partition part, increases the chambers between the air outlet grooves, and on the one hand, the bending extends the air flow path between the air outlet and the air hole, extends the silencing path, and enhances the silencing effect; on the other hand, it realizes a sudden change in the cross-section of the sound propagation path, so that the sound waves propagating along the path are reflected and the noise is reduced. The electronic vacuum pump forms double noise reduction in the air outlet groove through the noise reduction and waterproof cap, and further realizes multiple noise reduction by combining the buffer step and the buffer groove. At the same time, the bending of the air flow path and the blocking of the partition part can effectively prevent water or foreign matter from entering the pump chamber. Water or foreign matter that has entered the pump chamber can also be discharged in time through the air gap.

Description

Technical Field

[0001] The invention relates to the field of electronic vacuum pumps, and more particularly to a noise-reducing waterproof cap for an electronic vacuum pump, and an electronic vacuum pump with a gas outlet groove for noise reduction. Background Art

[0002] As regulations on automobile fuel consumption and carbon emissions gradually increase, small-displacement turbocharged engines and electric vehicles have become the choice of more and more automobile manufacturers.

[0003] For cars equipped with small-displacement turbocharged engines, their vacuum booster brake systems may have insufficient vacuum under certain operating conditions, affecting driving safety. In this case, the electronic vacuum pump can provide an additional vacuum source to ensure the normal operation of the vacuum booster and ensure driving safety.

[0004] Electric vehicles equipped with vacuum-assisted braking systems require additional devices to provide vacuum because there is no engine to provide vacuum. An electronic vacuum pump is a good choice.

[0005] However, the electronic vacuum pumps of the prior art, such as Figure 1 As shown, a receiving space is formed in the motor flange and a rubber-elastic insert is received in the receiving space, the insert having a hollow-shaped inner area, which is connected to the outlet connection and has at least one air guide opening, by means of which air can escape from the pump component into the inner area.

[0006] The disadvantage is that since there is only one chamber between the insert and the motor flange, foreign matter can enter the chamber from the air outlet and directly enter the space between the pump chamber and the silencer cover, thereby poorly preventing foreign matter from entering the pump chamber; and since only one chamber is designed, it is impossible to utilize the principle that the sound propagation path encounters a sudden change in cross-section to reflect the sound wave and effectively reduce the noise, resulting in poor noise reduction effect. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a noise reduction and waterproof cap for an electronic vacuum pump, which is used to effectively reduce noise at the position of the air outlet groove and prevent foreign matter from entering the pump chamber, as well as an electronic vacuum pump with air outlet groove noise reduction based on the noise reduction and waterproof cap.

[0008] The technical solution of the present invention is as follows:

[0009] A noise reduction and waterproof cap for an electronic vacuum pump comprises a cover plate and a partition portion, wherein the cover plate is provided with an air hole and the partition portion is arranged on the bottom surface of the cover plate; when the cover plate is arranged on the opening of an air outlet groove of a motor flange, the partition portion extends into the air outlet groove to separate the space of the air outlet groove, and the air outlet arranged in the air outlet groove and the air hole of the cover plate are respectively located on different sides of the partition portion.

[0010] Preferably, the partition portion is a partition wall substantially vertically connected to the cover plate, and a ventilation gap is provided at the lower edge of the partition wall.

[0011] Preferably, the area of ​​the air gap is larger than the total cross-sectional area of ​​the air holes.

[0012] Preferably, an airflow guiding channel is extended and arranged on the bottom surface of the cover plate corresponding to the air hole, and the inner diameter of the airflow guiding channel gradually increases from the air hole to the end of the channel.

[0013] Preferably, the inner diameter of the airflow guiding channel transitions smoothly or in steps from the air hole to the end of the channel.

[0014] Preferably, a plurality of bosses are respectively provided at the edge positions of the top surface of the cover plate for pressing together with the silencer cover.

[0015] An electronic vacuum pump with noise reduction in an air outlet groove, wherein the air outlet groove of a motor flange is covered with a noise reduction waterproof cap, the cover plate of the noise reduction waterproof cap is interference fit in the open opening of the air outlet groove, a partition portion extends into the air outlet groove to separate the space of the air outlet groove, the air outlet arranged in the air outlet groove and the air hole of the cover plate are respectively located on different sides of the partition portion, and the air flow path from the air outlet to the air hole is bent and extended to achieve noise reduction.

[0016] Preferably, the inner walls of the air outlet grooves are located at inferior angles and are provided with supporting ribs to form support and limit functions for the cover plate.

[0017] Preferably, the air outlet is arranged near the outside of the air outlet groove, and several levels of buffer steps and buffer grooves are arranged in the air outlet groove from the inside to the outside and from high to low, and the air outlet is opened in the buffer groove; the lower edge of the partition part presses against a certain level of buffer step in the middle.

[0018] Preferably, the inner and outer side walls of the buffer groove facing each other are respectively provided with a plurality of protruding buffer bumps, and the buffer bumps on the two side walls are arranged in a staggered manner.

[0019] The beneficial effects of the present invention are as follows:

[0020] The noise reduction and waterproof cap described in the present invention is suitable for electronic vacuum pumps. It replaces the hood-type structure of the prior art with a structure that is approximately flat, which not only reduces the volume and saves the space occupied by the air outlet groove; but also divides the space of the air outlet groove by a partition part, and increases the chamber between the air outlet grooves. On the one hand, the bend extends the air flow path between the air outlet and the air hole, extends the silencing path, and enhances the silencing effect; on the other hand, it realizes a sudden change in the cross-section of the sound propagation path, so that the sound waves propagating along the path are reflected, thereby reducing noise.

[0021] The electronic vacuum pump with air outlet groove noise reduction described in the present invention is based on the noise reduction waterproof cap, and double noise reduction is formed in the air outlet groove through the noise reduction waterproof cap, and combined with the buffer step and the buffer groove, multiple noise reduction is further achieved, and finally the working noise of the vacuum pump is reduced to the maximum extent. At the same time, the bending air flow path and the blocking of the partition part can effectively prevent water or foreign matter from entering the pump chamber. Water or foreign matter that has entered the pump chamber can also be discharged in time through the air gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the waterproof cover of the prior art;

[0023] Figure 2 It is a front view of the top surface of the noise reduction waterproof cap of the present invention;

[0024] Figure 3 It is a schematic diagram of the bottom angle of the noise reduction waterproof cap of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the motor flange part of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the electronic vacuum pump with air outlet groove noise reduction of the present invention (mainly showing the motor flange and waterproof cap)

[0027] Figure 6 yes Figure 5 A partial cross-sectional view of

[0028] In the figure: 10 is a waterproof cap, 11 is a cover plate, 12 is an air hole, 13 is an air flow guide channel, 14 is a partition, 15 is an air notch, 16 is a boss, 20 is an air outlet groove, 21 is an air outlet, 22 is a supporting rib, 23 is a buffer step, 24 is a buffer groove, 241 is a buffer convex block, and 30 is a motor flange. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0030] In order to solve the shortcomings of the prior art, such as poor noise reduction effect of the air outlet slot position of the vacuum pump during operation and inability to effectively prevent water or foreign matter from being sucked into the pump chamber, the present invention provides a noise reduction and waterproof cap for an electronic vacuum pump, which is used to adapt to the vacuum pump to achieve double noise reduction; based on the noise reduction and waterproof cap, the present invention also provides an electronic vacuum pump with noise reduction of the air outlet slot, which can effectively prevent water or foreign matter from entering the pump chamber through the blocking of the curved air flow path and the partition part. Water or foreign matter that has entered the pump chamber can also be discharged in time through the air gap.

[0031] The noise reduction waterproof cap 10 for an electronic vacuum pump of the present invention is as follows: Figure 2 , Figure 3 As shown, the cover plate 11 includes a cover plate 11 and a partition 14. The cover plate 11 is provided with an air hole 12. The partition 14 is provided on the bottom surface of the cover plate 11. When the cover plate 11 is provided at the opening of the air outlet groove 20 of the motor flange 30, the partition 14 extends into the air outlet groove 20 to separate the space of the air outlet groove 20. The air outlet 21 provided in the air outlet groove 20 and the air hole 12 of the cover plate 11 are respectively located on different sides of the partition 14. In specific implementation, the shape of the cover plate 11 matches the opening shape of the air outlet groove 20 to achieve the effect of sealing the opening of the air outlet groove 20 and prevent water or foreign matter from falling into the gap between the cover plate 11 and the air outlet groove 20. The air hole 12 is provided at a position corresponding to the inner side of the air outlet groove 20, that is, away from the air outlet 21. In the lateral relationship, the air inlet and the air outlet 21 are offset and separated by the partition 14. When water enters the air outlet 21 , it will not directly rush to the air hole 12 on the cover plate 11 , and enter the pump chamber.

[0032] In this embodiment, the partition part 14 is a partition wall connected to the cover plate 11 substantially vertically, and the cover plate 11 and the partition wall form a nearly "T"-shaped structure. The lower edge of the partition wall is provided with an air gap 15 for air flow to pass through; at the same time, when water or foreign matter has entered the pump chamber, the water or foreign matter can be discharged from the air outlet groove 20 in time through the air gap 15. In order not to affect the vacuuming rate, the area of ​​the air gap 15 is larger than the total cross-sectional area of ​​the air holes 12.

[0033] In order to prevent the airflow from becoming turbulent and causing noise after entering the air outlet groove 20 from the air hole 12, an airflow guide channel 13 is extended from the bottom surface of the cover plate 11 corresponding to the air hole 12, and the inner diameter of the airflow guide channel 13 gradually increases from the air hole 12 to the end of the channel. On the one hand, the airflow guide channel 13 can ensure the smoothness of the airflow, and on the other hand, the smaller air outlet can effectively prevent the passage of water or foreign matter, effectively reducing the water or foreign matter entering the pump chamber. According to the implementation requirements, the inner diameter of the airflow guide channel 13 transitions smoothly or in steps from the air hole 12 to the end of the channel.

[0034] For installation with the muffler, the top edge of the cover plate 11 is provided with a plurality of bosses 16 for pressing with the muffler. During implementation, the bosses 16 are distributed at the top edge of the cover plate 11 and give way to the position of the sealing ring. The height of the bosses 16 can just match the bottom plate of the pump chamber and the muffler to prevent the waterproof cap 10 from falling off from the air outlet groove 20.

[0035] Based on the noise reduction waterproof cap 10, the present invention also provides an electronic vacuum pump with noise reduction in the air outlet groove 20, such as Figure 4 , Figure 5 , Figure 6As shown, the air outlet groove 20 of the motor flange 30 is covered with a noise reduction waterproof cap 10, and the cover plate 11 of the noise reduction waterproof cap 10 is interference-fitted with the opening of the air outlet groove 20 to form a seal for the opening of the air outlet groove 20. The partition part 14 extends into the air outlet groove 20 to separate the space of the air outlet groove 20. The air outlet 21 arranged in the air outlet groove 20 and the air hole 12 of the cover plate 11 are respectively located on different sides of the partition part 14, and the air flow path between the air outlet 21 and the air hole 12 is bent and extended to achieve noise reduction. In this embodiment, a partition part 14 is provided to divide the space of the air outlet groove 20 into two chambers through the partition part 14. The principle that the cross-sectional mutation of the sound propagation path can be used to reflect the sound waves propagating along the path back can be effectively reduced to reduce the working noise at the position of the air outlet groove 20. Among them, the partition part 14 itself can also reflect the sound waves, thereby achieving a better noise reduction effect. At the same time, the air flow path between the air holes 12 and the air outlet 21 which are offset in lateral position is bent and extended through the partition part 14. By extending the noise propagation path, the noise can be reduced, and the working noise at the air outlet slot 20 position can be further reduced.

[0036] The inner wall of the air outlet groove 20 is located at a bad angle (angle less than 180°), and a support rib 22 is provided to support and limit the cover plate 11 to prevent the cover plate 11 from sinking too deep during installation, causing installation failure. At the same time, the cover plate 11 is also supported and limited by the support rib 22, so that the cover plate 11 can be installed in a fool-proof manner, that is, pressed to the bottom until the cover plate 11 and the support rib 22 are pressed against each other, and the cover plate 11 cannot continue to sink, and the top surface of the cover plate 11 is flush with the surface of the motor flange 30.

[0037] The air outlet 21 is arranged near the outside of the air outlet groove 20. Several levels of buffer steps 23 and buffer grooves 24 are arranged in the air outlet groove 20 from the inside to the outside and from high to low. The air outlet 21 is opened in the buffer groove 24. The lower edge of the partition part 14 abuts against a certain level of buffer step 23 in the middle. In this embodiment, two levels of buffer steps 23 and a first level of buffer groove 24 are included to form a three-level buffer structure. The lower edge of the partition part 14 abuts against the second level buffer step 23. The airflow guide channel 13 is located above the buffer step 23. The end of the airflow guide channel 13 faces the first level buffer step 23, or the first level buffer step 23 and part of the second level buffer step 23.

[0038] The two side walls of the buffer groove 24 facing each other are respectively provided with a plurality of protruding buffer bumps 241, and the buffer bumps 241 of the two side walls are arranged in a staggered manner. The air outlet 21 is arranged outside the buffer groove 24, between two buffer bumps 241 on the outer groove wall of the buffer groove 24.

[0039] When the vacuum pump is running, the gas flowing out of the pump chamber cover 11 enters the airflow guide channel 13 from the air hole 12, and after flowing out of the airflow guide channel 13, it passes through the two-stage buffer step 23, passes through the air gap 15, and reaches the buffer groove 24 at the bottom and the outermost side. The gas entering the buffer groove 24 needs to pass through the gas path surrounded by the labyrinth buffer groove 24 formed by the buffer protrusion 241 before reaching the air outlet 21. The present invention performs double noise reduction by extending the noise propagation path and changing the cross section of the noise propagation path.

[0040] The above embodiments are only used to illustrate the present invention, and are not used to limit the present invention. As long as they are based on the technical essence of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. An electronic vacuum pump with air outlet noise reduction, characterized in that: The air outlet groove cover of the motor flange is equipped with a noise reduction and waterproof cap, which includes a cover plate and a partition part with a nearly flat structure. The cover plate is provided with an air hole, and the partition part is arranged on the bottom surface of the cover plate; the cover plate is interference fit in the opening of the air outlet groove, and the top surface of the cover plate is used for pressing with the silencer cover, and the partition part extends into the air outlet groove to separate the space of the air outlet groove, and the air outlet arranged in the air outlet groove and the air hole of the cover plate are respectively located on different sides of the partition part, and the air flow path from the air outlet to the air hole is bent and extended to achieve noise reduction; the lower edge of the partition part abuts the bottom of the air outlet groove and is provided with an air gap.

2. The electronic vacuum pump with air outlet noise reduction according to claim 1, characterized in that: The partition part is a partition wall which is substantially vertically connected to the cover plate, and a ventilation gap is arranged at the lower edge of the partition wall.

3. The electronic vacuum pump with air outlet noise reduction according to claim 1, characterized in that: The area of ​​the air gap is greater than the total cross-sectional area of ​​the air holes.

4. The electronic vacuum pump with air outlet noise reduction according to claim 1, characterized in that: An airflow guiding channel is extended and arranged on the bottom surface of the cover plate corresponding to the air hole, and the inner diameter of the airflow guiding channel gradually increases from the air hole to the end of the channel.

5. The electronic vacuum pump with air outlet noise reduction according to claim 4, characterized in that: The inner diameter of the airflow guiding channel transitions smoothly or in a stepped manner from the air hole to the end of the channel.

6. The electronic vacuum pump with air outlet noise reduction according to claim 1, characterized in that: A plurality of bosses are respectively arranged at the edge positions of the top surface of the cover plate for pressing together with the muffler cover.

7. The electronic vacuum pump with air outlet noise reduction according to claim 1, characterized in that: The inner wall of the air outlet groove is located at a bad angle, and is provided with supporting convex ribs to form a support limit for the cover plate.

8. The electronic vacuum pump with air outlet noise reduction according to claim 1, characterized in that: The air outlet is arranged near the outside of the air outlet groove, and a plurality of buffer steps and buffer grooves are arranged in the air outlet groove from the inside to the outside and from high to low, and the air outlet is opened in the buffer groove; the lower edge of the partition part abuts against a certain buffer step in the middle.

9. The electronic vacuum pump with air outlet noise reduction according to claim 1, characterized in that: A plurality of protruding buffer bumps are respectively arranged on two side walls facing each other inside and outside of the buffer groove, and the buffer bumps on the two side walls are arranged in a staggered manner.

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