One-way valve and electronic vacuum pump

Abstract

The present invention provides a one-way valve and an electronic vacuum pump. The one-way valve comprises a valve cover and a valve core. The valve cover has a mounting cavity, an airflow channel communicating with the mounting cavity, and a mounting opening. The valve core is mounted within the mounting cavity of the valve cover. The valve core comprises a connected mounting portion and a diaphragm. The diaphragm corresponds to the airflow channel to block the airflow channel. The mounting portion is mounted within the mounting cavity and defines an airflow channel. An electronic vacuum pump employing this one-way valve can effectively improve the pump's ability to prevent foreign matter from entering the pump body with rapidly redrawn air when the vacuum pump stops operating, potentially damaging the pump.

Description

Technical Field

[0001] The present invention relates to the field of electronic vacuum pumps, and in particular to a one-way valve and an electronic vacuum pump having the one-way valve. Background Art

[0002] Automotive electronic vacuum pumps are used in vehicle braking systems, working in conjunction with vacuum boosters to assist in braking. With increasing fuel efficiency and emission requirements, energy-efficient and new energy vehicles are becoming increasingly popular choices for automakers. The vacuum-assisted braking systems of some traditional fuel-powered vehicles can experience insufficient vacuum under certain operating conditions, causing the brake pedal to stiffen, which in turn increases braking distance and potentially affects driving safety. In these situations, activating the electronic vacuum pump to provide vacuum ensures proper functioning of the vacuum booster and driving safety. The electronic vacuum pump's on-demand operation effectively conserves energy. For new energy vehicles without a traditional engine, or where the engine is disabled under certain operating conditions, an electronic vacuum pump can provide the vacuum source for the vacuum-assisted braking system.

[0003] With existing electronic vacuum pumps, when they stop working, the external air pressure is greater than the air pressure inside the vacuum pump. The external air is instantly sucked back into the vacuum pump under the pressure difference, and external foreign matter also enters the vacuum pump, thereby damaging the vacuum pump, causing the brake pedal to become hard, the braking distance to be lengthened, and a safety hazard for vehicle braking. Summary of the Invention

[0004] To this end, the present invention provides a one-way valve and an electronic vacuum pump having the one-way valve, which can effectively reduce the possibility of external foreign matter entering the vacuum pump along with the back-sucked air when the vacuum pump stops working.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A one-way valve includes a valve cover and a valve core, the valve cover has an installation cavity and an air flow channel and an installation opening connected to the installation cavity, the valve core is assembled in the installation cavity of the valve cover, the valve core includes a connected installation portion and a diaphragm, the diaphragm corresponds to the air flow channel to block the air flow channel, the installation portion is assembled in the installation cavity, and an air passage is opened.

[0007] Furthermore, the valve cover has an end portion, the air flow channel is opened on the end portion, and the diaphragm corresponds to the inner wall of the end portion.

[0008] Furthermore, an abutment ring is protruded from the inner wall of the end portion toward the installation cavity, and the diaphragm abuts against the abutment ring; and the airflow channel is located inside the abutment ring.

[0009] Furthermore, the inner wall of the valve cover is further indented with a groove, and the groove is located on the periphery of the diaphragm; the outer peripheral surface of the valve cover close to the installation opening is an inclined guide surface that is arranged obliquely.

[0010] Furthermore, the number of the air flow channels is multiple, and the multiple air flow channels correspond to the peripheral positions of the diaphragm and are evenly distributed; and / or, the air passage is a gap opened on the outer peripheral surface of the mounting portion, and the number of the air passage is one or more.

[0011] Furthermore, the valve core also includes a connecting portion, which connects the mounting portion and the diaphragm; the connecting portion is connected to the middle position of the diaphragm, and the air flow channel corresponds to the peripheral position of the diaphragm, and the air flow channel is blocked or opened by deforming the peripheral position.

[0012] Furthermore, the valve core is an integrated connection structure, the diameter of the connection portion is much smaller than the mounting portion and the diaphragm, the valve core and the valve cover are both made of flexible materials, and the hardness of the valve cover is greater than that of the valve core.

[0013] An electronic vacuum pump includes a vacuum pump body and a one-way valve, wherein the one-way valve is arranged in the air outlet channel of the vacuum pump body; the one-way valve is the one-way valve described above; the air flow channel of the one-way valve is connected to the air inlet of the air outlet channel, and the air passage of the one-way valve is connected to the air outlet of the air outlet channel.

[0014] Furthermore, the vacuum pump main body includes a motor part and a pump body part that are connected to each other, and a receiving groove and an air outlet connected to the receiving groove are provided on the motor flange end cover of the motor part. The one-way valve is assembled in the receiving groove, and a sealing ring is provided between the motor part and the pump body part. The sealing ring also has a one-way valve fixing part extending between the pump body part and the one-way valve.

[0015] Furthermore, the pump body part includes a silencer cover, a silencer pad and a pump chamber assembly, the silencer pad is arranged between the silencer cover and the pump chamber assembly, the silencer pad includes a connecting ring and an elastic diaphragm arranged in the connecting ring, the connecting ring, the elastic diaphragm and the cover plate of the pump chamber assembly together form an air inlet chamber; the silencer pad, the pump chamber assembly, the silencer cover and the receiving groove of the motor flange end cover together form the air outlet channel, and the connecting ring of the silencer pad is also provided with an air hole connecting the air inlet chamber and the air outlet channel; the one-way valve and one of the air holes are located in the same radial direction centered on the air inlet chamber.

[0016] Furthermore, the mounting portion of the valve core has a step protruding at the end facing the mounting opening or the bottom of the accommodating groove, and the step is located between the mounting portion and the bottom of the accommodating groove, thereby forming an intermediate cavity connecting the air outlet and the air passage between the mounting portion and the bottom of the accommodating groove.

[0017] The technical solution provided by the present invention has the following beneficial effects:

[0018] When the electronic vacuum pump is working, the extracted air flow flows through the one-way valve, enters from the air flow channel of the valve cover and flushes the diaphragm on the valve core, then enters the installation cavity, flows through the air passage of the installation part to the air outlet, and finally is discharged to the outside through the air outlet.

[0019] When the electronic vacuum pump stops working, since the air pressure outside the vacuum pump is greater than the air pressure inside the vacuum pump, the diaphragm of the valve core is pressed against the inner cavity of the valve cover under the action of the pressure difference and its own elasticity, thereby blocking the air flow channel, so that a seal is formed between the internal space of the vacuum pump and the external atmosphere. The air flow outside the vacuum pump cannot be quickly sucked back into the vacuum pump, which greatly reduces the possibility of external foreign matter such as liquids and particles being sucked back into the pump body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure shows a schematic diagram of the structural decomposition of the one-way valve in the embodiment;

[0021] Figure 2 Shown is a cross-sectional view of a one-way valve in an embodiment;

[0022] Figure 3 Shown is a cross-sectional view of the valve cover of the one-way valve in the embodiment;

[0023] Figure 4 The figure shows a schematic diagram of the three-dimensional structure of the valve core of the one-way valve in the embodiment;

[0024] Figure 5 Shown is a front view of the valve core of the one-way valve in the embodiment;

[0025] Figure 6 The figure shows a cross-sectional view of the valve core of the one-way valve in the embodiment;

[0026] Figure 7 The figure shows the appearance of the electronic vacuum pump in the embodiment;

[0027] Figure 8 Shown is a cross-sectional view of an electronic vacuum pump in an embodiment;

[0028] Figure 9 The figure shows a top view of the electronic vacuum pump in the embodiment with the pump body hidden;

[0029] Figure 10 The figure shows the structure of the electronic vacuum pump in the embodiment behind the hidden silencer cover;

[0030] Figure 11 The figure shows the structure of the electronic vacuum pump in the embodiment after the silencer cover and the sealing ring are hidden;

[0031] Figure 12 Shown is a schematic structural diagram of a sound-absorbing pad in an embodiment;

[0032] Figure 13 The figure shows a schematic structural diagram of the sound-absorbing pad in the embodiment at another angle;

[0033] Figure 14 Shown is a cross-sectional view of a sound-absorbing pad in an embodiment;

[0034] Figure 15 Shown is a schematic structural diagram of the soundproof cover in the embodiment. DETAILED DESCRIPTION

[0035] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0036] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0037] Reference Figures 1 to 6 As shown, this embodiment provides a one-way valve 100, including a valve cover 10 and a valve core 20. The valve cover 10 has a mounting cavity 101, an air flow channel 111 communicating with the mounting cavity 101, and a mounting opening 102. The valve core 20 is assembled within the mounting cavity 101 of the valve cover 10. The valve core 20 includes a connected mounting portion 21 and a diaphragm 22. The diaphragm 22 corresponds to the air flow channel 111 to block the air flow channel 111. The mounting portion 21 is assembled within the mounting cavity 101 and defines an air passage 211. In this embodiment, the mounting portion 21 is tightly fitted within the mounting cavity 101 by an interference fit or transition fit, such as a method that can achieve a stable connection.

[0038] Continue to refer to Figures 7 to 15 As shown, this embodiment also provides an electronic vacuum pump, including a vacuum pump body and a one-way valve, wherein the one-way valve is arranged in the air outlet channel 60 of the vacuum pump body; specifically, the one-way valve is the one-way valve 100 described above; the air flow channel 111 of the one-way valve 100 is connected to the air inlet of the air outlet channel 60 (the air inlet is the air hole 4101 of the middle silencer pad 410 described below), and the air passage 211 of the one-way valve 100 is connected to the air outlet 61 of the air outlet channel 60.

[0039] When the electronic vacuum pump is working, the extracted air flow flows through the one-way valve 100, enters from the air flow channel 111 of the valve cover 10 and flushes the diaphragm 22 on the valve core 20, then enters the installation cavity 101, and then flows to the air outlet 61 through the air passage 211 of the installation part 21, and finally is discharged to the outside through the air outlet 61.

[0040] When the electronic vacuum pump stops working, since the air pressure outside the vacuum pump is greater than the air pressure inside the vacuum pump, the diaphragm 22 of the valve core 20 is pressed against the inner cavity of the valve cover 10 under the action of the pressure difference and its own elasticity, thereby blocking the air flow channel 111, so that a seal is formed between the internal space of the vacuum pump and the external atmosphere. The air flow outside the vacuum pump cannot be quickly sucked back into the vacuum pump, which greatly reduces the possibility of external foreign matter such as liquids and particles being sucked back into the pump body.

[0041] At the same time, when the electronic vacuum pump is not working and is submerged in water, liquid enters in the opposite direction from the air outlet 61. The diaphragm 22 of the valve core 20 can be pressed against the inner wall of the installation cavity 101 under the action of water pressure, thereby effectively blocking the air flow channel 111 and effectively preventing liquid from entering the interior of the electronic vacuum pump. Even if water enters, it is only a small amount, which effectively protects the internal components of the electronic vacuum pump from being damaged, thereby improving the electronic vacuum pump's anti-liquid intrusion performance and robustness.

[0042] The one-way valve 100 is configured such that the movement of the diaphragm 22 is mainly driven by the pressure difference. Compared with the structure in the prior art that realizes sealing by the elastic force of a spring, the one-way valve 100 has the advantages of simple structure, low loss and long service life.

[0043] Specifically, in this embodiment, the vacuum pump body includes a motor portion 30 and a pump body portion 40, which are connected to each other. The motor portion 30 includes a motor and a motor flange end cap 31. The motor of the motor portion 30 is connected to the pump body portion 40 (specifically, the rotor of the pump chamber assembly of the pump body portion 40) to drive the pump chamber assembly to operate and achieve vacuum. The motor flange end cap 31 of the motor portion 30 is provided with a receiving groove and an air outlet connected to the receiving groove (the air outlet is the air outlet 61 of the air outlet channel 60). The receiving groove is part of the air outlet channel 60. The one-way valve 100 is assembled in the receiving groove. A sealing ring 50 is provided between the motor portion 30 and the pump body portion 40 for sealing. During assembly, the one-way valve 100 is first installed in the receiving groove, and then the sealing ring 50 and the pump body portion 40 are covered and fixed to complete the assembly. In this way, the one-way valve 100 can be easily assembled.

[0044] Furthermore, the sealing ring 50 includes a one-way valve securing portion 51 extending between the pump body 40 and the one-way valve 100. This allows the one-way valve 100 to be held in place by the one-way valve securing portion 51, which in turn is held in place by the pump body 40. This ensures that the one-way valve 100 is securely installed and prevents axial movement. Furthermore, the sealing ring 50 and the one-way valve securing portion 51 are integrally formed, facilitating production and installation.

[0045] Specifically, in the one-way valve 100 structure, the valve cover 10 has an end 11, the air flow channel 111 is opened on the end 11, and the diaphragm 22 corresponds to the inner wall of the end 11; when there is a pressure difference between the inside and outside of the vacuum pump, the diaphragm 22 can fit on the inner wall of the end 11 of the valve cover 10 and block the air flow channel 111.

[0046] In the natural state (before vacuum pumping), the contact area between the inner wall of the valve cover 10 and the diaphragm 22 may have an interference fit or a clearance fit. However, at the moment the vacuum pump is stopped, the internal and external pressure differential causes the diaphragm 22 to come into close contact with the inner wall of the valve cover 10, forming a seal. Specifically, when the contact area between the inner wall of the valve cover 10 and the diaphragm 22 has a clearance fit in the natural state (before vacuum pumping), the internal and external pressure differential overcomes the weight of the valve core 20, pushing up the valve core 20 and causing the diaphragm 22 of the valve core 20 to fit against the inner wall of the valve cover 10.

[0047] Furthermore, an abutment ring 12 protrudes from the inner wall of the end portion 11 into the mounting cavity 101, and the diaphragm 22 abuts against the abutment ring 12; the airflow channel 111 is located within the abutment ring 12. The provision of the abutment ring 12 can effectively improve the tightness of the fit between the diaphragm 22 and the valve cover 10. At the same time, it ensures that the diaphragm 22 of the valve core 20 and the abutment ring 12 of the valve cover 10 maintain a tight fit during long-term use of the one-way valve 100, avoiding the problem of the diaphragm 22 being unable to fit tightly against the valve cover 10 due to elastic failure during long-term use, thereby improving reliability. Of course, in other embodiments, the protruding abutment ring 12 can also be omitted. For example, if it is directly flat, the diaphragm 22 can also fit against the flat inner wall of the valve cover 10 through the action of the internal and external pressure difference, thereby blocking the airflow channel 111. However, during long-term use, the effect will be less than that of providing the abutment ring 12.

[0048] The inner wall of the valve cover 10 further includes an inwardly recessed groove 13, which is located around the periphery of the diaphragm 22. In this embodiment, the groove 13 is located around the abutment ring 12. The provision of the groove 13 provides airflow escape or buffer space, preventing eddies and turbulence, and preventing the diaphragm 22 from generating acoustic effects, i.e., noise. Specifically, the groove 13 is an annular groove.

[0049] The outer peripheral surface of the valve cover 10 near the mounting opening 102 is an inclined guide surface 14. With such a configuration, when the one-way valve 100 is assembled into the vacuum pump body, specifically into the receiving groove of the motor flange end cover 31, the inclined guide surface 14 has a guiding function, which is conducive to the installation and cooperation with the motor flange end cover 31.

[0050] Preferably, the number of the airflow channels 111 is two or more, more preferably, three or more. In this specific embodiment, the number of the airflow channels 111 is five; thus, the air entering the installation cavity 101 is more uniform. Of course, in other embodiments, the number of the airflow channels 111 is not limited to this, and one airflow channel may also be used.

[0051] The structure of the valve cover 10 provided in this embodiment is one of the more preferred structures. Of course, in other embodiments, the structure of the valve cover 10 is not limited thereto, for example, the abutment ring 12, the concave cavity 13 and / or the inclined guide surface 14 may not be provided.

[0052] Specifically, the valve core 20 also includes a connecting portion 23, which connects the mounting portion 21 and the diaphragm 22; the connecting portion 23 is connected to the middle position of the diaphragm 22, so that the peripheral positions of the diaphragm 22 can be deformed, and the air flow channel 111 corresponds to the peripheral position of the diaphragm 22, and the air flow channel 111 is blocked or opened by deforming the peripheral position.

[0053] Specifically, the five air flow channels 111 are evenly distributed and correspond to the outer periphery of the diaphragm 22 , so that the force acting on the diaphragm 22 is more even during operation.

[0054] More specifically, in this embodiment, the diameter of the connecting portion 23 is much smaller than that of the mounting portion 21 and the diaphragm 22. Thus, there is a large space between the mounting portion 21 and the diaphragm 22 to allow the diaphragm 22 to deform and make way. Of course, in other embodiments, the connection method between the mounting portion 21 and the diaphragm 22 is not limited to this, and a direct connection may also be possible.

[0055] The mounting portion 21 of the valve core 20 further has a raised step 24 at the end facing the mounting opening 102. With this arrangement, when the one-way valve 100 is installed in the vacuum pump body, such as in the receiving groove of the motor flange end cover 31, the one-way valve 100 can abut against the bottom of the receiving groove via the step 24, thereby raising the mounting portion 21. An intermediate cavity 62 is formed between the mounting portion 21 and the bottom of the receiving groove, connecting the air outlet and the air passage 211. The airflow output through the air passage 211 flows through the intermediate cavity 62 and then flows out from the outlet provided at the bottom of the receiving groove, thereby preventing the air path from being blocked due to the air passage 211 being misaligned with the outlet at the bottom of the receiving groove during installation. Of course, in other embodiments, the step 24 may not be provided on the one-way valve, for example, a step structure may be formed by protruding from the bottom of the receiving groove.

[0056] The air passage 211 is a notch formed on the outer surface of the mounting portion 21, which is easy to process. Of course, the air passage 211 can also be a through-hole structure.

[0057] Furthermore, the valve core 20 is an integrally connected structure, that is, the valve core 20 is made of elastic material and can be integrally formed by, for example, mold injection molding, and is easy to prepare.

[0058] More specifically, both the valve core 20 and the valve cover 21 are made of flexible materials, providing a flexible seal. Furthermore, the valve cover 10 is harder than the valve core 20, satisfying the following requirements: ensuring an interference fit with the pump body 40 for waterproofing while also preventing structural deformation to ensure smooth airflow.

[0059] Of course, in other embodiments, the structure of the valve core 20 is not limited thereto.

[0060] Furthermore, in this embodiment, the pump body portion 40 includes a silencer cover 420, a silencer pad 410 and a pump chamber assembly 430, and the motor shaft of the motor portion 30 is connected to the rotor of the pump chamber assembly 430 to drive the rotor to rotate and achieve vacuum.

[0061] The muffler pad 410 is disposed between the muffler cover 420 and the pump chamber assembly 430. The muffler pad 410 includes a connecting ring 411 and an elastic diaphragm 412 disposed within the connecting ring 411. The connecting ring 411, the elastic diaphragm 412, and the cover of the pump chamber assembly 430 together form the air inlet chamber 41. The muffler pad 410, the pump chamber assembly 430, the muffler cover 420, and the receiving groove of the motor flange end cover 31 together form the air outlet channel 60. The connecting ring 411 of the muffler pad 410 is also provided with an air hole 4101 connecting the air inlet chamber 41 and the air outlet channel 60. The air flow extracted from the pump chamber assembly 430 is transferred to the air inlet chamber 41 and then flows out to the air outlet channel 60 through the air hole 4101. Specifically, the number of the air holes 4101 is at least two, and in this specific embodiment, there are two, and they are evenly distributed on the connecting ring 411 of the muffler pad 410.

[0062] More specifically, Figure 8 、 Figure 10 、 Figure 11 As shown, the one-way valve 100 and one of the air holes 4101 are located in the same radial direction centered on the air inlet chamber 41, that is, the air inlet chamber 41, the one-way valve 100 and the corresponding air hole 4101 are located on the same radial straight line.

[0063] The muffler cover 420 is provided with a muffler cover fixing ring 421 that abuts against the outer area 4123 of the elastic diaphragm 412; this effectively secures the muffler pad 410, allowing the muffler pad 410 to stably abut against the cover plate of the pump chamber assembly 430, thereby achieving stable assembly of the muffler pad 410. More specifically, the muffler pad 410 and the muffler cover 420 are fixed together by an interference fit between the muffler pad 410's connecting ring 411 and the muffler cover fixing ring 421, allowing the muffler pad 410's connecting ring 411 to stably abut against the cover plate of the pump chamber assembly 430.

[0064] The middle area 4121 of the elastic diaphragm 412 is arched toward the muffler cover 420 and is higher than the abutment surface of the muffler cover fixing ring 421 against the elastic diaphragm 412. This arrangement increases the volume of the air intake chamber 41, thereby greatly enhancing the sound absorbing and vibration reduction effect.

[0065] Specifically, the abutting surface of the muffler fixing ring 421 abuts against the surface of the peripheral area 4123 of the elastic diaphragm 412. Therefore, the abutting surface of the muffler fixing ring 421 is substantially flush with the surface of the peripheral area 4123 of the elastic diaphragm 412. Therefore, the arch height of the middle area 4121 of the elastic diaphragm 412 is as shown in FIG. Figure 14 The height h in the middle is the distance between the lower surface of the middle area 4121 and the upper surface of the peripheral area 4123.

[0066] Specifically, the arching of the middle region 4121 of the elastic diaphragm 412 refers to natural arching without the action of external force, and is not a deformation caused by external force (such as blowing).

[0067] The elastic diaphragm 412 and the muffler cover 420 are spaced apart, and the connecting ring 411, the elastic diaphragm 412 and the muffler cover 420 together enclose a buffer chamber 42. The buffer chamber 42 and the air inlet chamber 41 are respectively located on the upper and lower sides of the elastic diaphragm 412 (such as Figure 8 As shown), the buffer chamber 42 provides a certain buffer distance for the elastic diaphragm 412 to prevent the airflow from contacting or hitting the top of the silencer cover 420 when impacted.

[0068] The elastic diaphragm 412's central region 4121 and peripheral region 4123 are transitionally connected via an arcuate connecting segment 4122. Specifically, the elastic diaphragm 412 comprises a central region 4121 located in the center, a peripheral region 4123 located at the periphery, and an arcuate connecting segment 4122 connecting the central region 4121 and the peripheral region 4123. This arrangement creates an arcuate inner wall 41221 between the central region 4121 and the peripheral region 4123, providing a guiding function and effectively increasing the elastic diaphragm 412's resistance to airflow impact in its transverse cross-section, further preventing airflow from contacting or striking the top of the silencer cover 420.

[0069] The muffler cover 420 is provided with a flow channel for connecting the inside and outside of the buffer chamber 42. This arrangement allows gas exiting the air inlet chamber 41 (i.e., the gas within the air outlet channel 60) to flow through the flow channel to the buffer chamber 42, fully utilizing the gap between the top of the muffler pad 410 and the muffler cover 420 (i.e., the space in the buffer chamber 42). This compensates for the space lost between the top of the muffler pad 410 and the muffler cover 420 due to the upward arching of the elastic diaphragm 412 of the muffler pad 410 (i.e., toward the muffler cover 420), further reducing noise. At the same time, the airflow into the buffer chamber 42 effectively offsets the upward deformation of the elastic diaphragm 412.

[0070] The connecting ring 411 of the muffler pad 410 further extends outwardly with an annular wing 413. The muffler cover 420 further includes a raised outer ring 422 that abuts against the annular wing 413 of the muffler pad 410. The muffler cover fixing ring 421 and the raised outer ring 422 abut against the inner and outer portions of the connecting ring 411 of the muffler pad 410, respectively, effectively preventing the muffler pad 410 from dislocating due to air pressure differences.

[0071] The aforementioned flow channel is specifically implemented by providing notches in both the muffler retaining ring 421 and the outer convex ring 422. The notch in the muffler retaining ring 421 is defined as an inner notch 4211, while the notch in the outer convex ring 422 is defined as an outer notch 4221. The buffer chamber 42 communicates with the external air outlet channel via the inner notch 4211 and the outer notch 4221. Thus, the inner notch 4211 and the outer notch 4221 form the flow channel, resulting in a simple structural design. Of course, in other embodiments, the structure of the air channel is not limited to this.

[0072] More specifically, the silencer cover fixing ring 421 is provided with two rotationally symmetrical inner notches 4211, and the outer convex ring 422 is provided with multiple circumferentially evenly distributed outer notches 4221. The inner notches 4211 and outer notches 4221 are staggered. Furthermore, the silencer pad 410 is provided with anti-misalignment ribs 414. Specifically, two anti-misalignment ribs 414 are provided, and they are rotationally symmetrical. The anti-misalignment ribs 414 fit within the inner notches 4211 to achieve positioning and assembly, ensuring the correct orientation of the silencer pad 410 and the silencer cover 420 during installation. For example, the air holes 4101 of the silencer pad 410 are aligned with the larger space between the silencer cover 420 and the silencer pad 410. This effectively prevents noise issues caused by improper installation of the silencer pad 410. The anti-misalignment ribs 414 and the inner notches 4211 of the silencer cover fixing ring 421 form a clearance for ventilation. The noise-absorbing pad 410 is an integrally connected structure, that is, it can be integrally formed by mold injection molding or the like, and is easy to prepare.

[0073] The contact surface 4111 of the connecting ring 411 against the cover plate of the pump chamber assembly 430 is an arc-shaped surface, so that the initial contact between the silencer pad 410 and the cover plate is line contact, which has better fit and can better absorb vibration and reduce noise.

[0074] Furthermore, in this embodiment, the silencer pad 410 is provided with a first avoidance groove 416 for making way for the mounting screws (defined as the first mounting screws 431) of the pump chamber assembly 430. Specifically, the number of the first avoidance grooves 416 is four, so that it can be ensured that the silencer pad 410 does not interfere with the mounting screws (i.e., the first mounting screws 425) of the pump chamber assembly 430.

[0075] At the same time, the air hole 4101 is staggered with the first avoidance groove 416. With this arrangement, after installation, the periphery of the first avoidance groove 416 is the first mounting screw 431, and a large area of ​​the first avoidance groove 416 is blocked by the first mounting screw 431, leaving insufficient space for arranging the air hole 4101. Therefore, the air hole 4101 is staggered with the first avoidance groove 416, and the air hole 4101 has a large layout space and will not be blocked by the first mounting screw 431.

[0076] More specifically, the muffler cover 420 is mounted on the motor portion 30 via a second mounting screw 440. A second relief groove 425 is provided on the muffler cover 420 to accommodate the second mounting screw 440, thereby reducing the overall volume. Furthermore, the concave structure of the second relief groove 425 of the muffler cover 420 reduces the gap between the muffler cover 420 and the muffler pad 410. Therefore, in this embodiment, the air holes 4101 are staggered with the second relief groove 425. This arrangement allows the air holes 4101 to correspond to the larger gap between the muffler cover 420 and the muffler pad 410, thereby further reducing noise.

[0077] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. An electronic vacuum pump, comprising a vacuum pump body and a one-way valve, characterized in that: The one-way valve includes a valve cover and a valve core, the valve cover has a mounting cavity, an air flow channel connected to the mounting cavity, and a mounting opening, the valve core is assembled in the mounting cavity of the valve cover, the valve core includes a connected mounting portion, a connecting portion and a diaphragm, the diaphragm corresponds to the air flow channel to block the air flow channel, the mounting portion is tightly assembled in the mounting cavity, and is provided with an air passage; the connecting portion connects the mounting portion and the diaphragm; the connecting portion is connected to the middle position of the diaphragm, the air flow channel corresponds to the peripheral position of the diaphragm, and the air flow channel is blocked or opened by deforming the peripheral position; the valve core is an integrally formed integral connection structure, the diameter of the connecting portion is much smaller than the mounting portion and the diaphragm, the valve core and the valve cover are both made of flexible material, and the hardness of the valve cover is greater than that of the valve core; the air flow channel of the one-way valve is connected to the air inlet of the outlet channel, the air passage of the one-way valve is connected to the air outlet of the outlet channel, and the one-way valve is interference-arranged in the outlet channel of the vacuum pump body through the valve cover.

2. The electronic vacuum pump according to claim 1, wherein: The valve cover has an end portion, the air flow channel is opened on the end portion, and the diaphragm corresponds to the inner wall of the end portion.

3. The electronic vacuum pump according to claim 2, wherein: An abutment ring is protruded from the inner wall of the end portion toward the installation cavity, and the diaphragm abuts against the abutment ring; the air flow channel is located inside the abutment ring.

4. The electronic vacuum pump according to claim 1, 2 or 3, characterized in that: The inner wall of the valve cover is further inwardly recessed with a groove, and the groove is located at the periphery of the diaphragm; the outer peripheral surface of the valve cover close to the installation opening is an inclined guide surface arranged obliquely.

5. The electronic vacuum pump according to claim 1 or 2, characterized in that: There are multiple air flow channels, which correspond to the peripheral positions of the diaphragm and are evenly distributed; and / or, the air passages are gaps opened on the outer peripheral surface of the mounting portion, and there are one or more air passages.

6. The electronic vacuum pump according to claim 1, wherein: The vacuum pump body includes a motor part and a pump body part that are connected to each other. A receiving groove and an air outlet connected to the receiving groove are provided on the motor flange end cover of the motor part. The one-way valve is assembled in the receiving groove. A sealing ring is provided between the motor part and the pump body part. The sealing ring also has a one-way valve fixing part extending between the pump body part and the one-way valve.

7. The electronic vacuum pump according to claim 6, characterized in that: The pump body part includes a silencer cover, a silencer pad and a pump chamber assembly, the silencer pad is arranged between the silencer cover and the pump chamber assembly, the silencer pad includes a connecting ring and an elastic diaphragm arranged in the connecting ring, the connecting ring, the elastic diaphragm and the cover plate of the pump chamber assembly together form an air inlet chamber; the silencer pad, the pump chamber assembly, the silencer cover and the receiving groove of the motor flange end cover together form the air outlet channel, and the connecting ring of the silencer pad is also provided with an air hole connecting the air inlet chamber and the air outlet channel; the one-way valve and one of the air holes are located in the same radial direction centered on the air inlet chamber.

8. The electronic vacuum pump according to claim 1, wherein: The mounting portion of the valve core has a step protruding at the end facing the mounting opening or the bottom of the accommodating groove, and the step is located between the mounting portion and the bottom of the accommodating groove, thereby forming an intermediate cavity between the mounting portion and the bottom of the accommodating groove that connects the air outlet and the air passage.

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