CN114893592A - Check valve and electronic vacuum pump - Google Patents

Abstract

The invention provides a one-way valve and an electronic vacuum pump, wherein the one-way valve comprises a valve cover and a valve core, the valve cover is provided with an installation cavity, an airflow channel and an installation opening, the airflow channel and the installation opening are communicated with the installation cavity, the valve core is assembled in the installation cavity of the valve cover, the valve core comprises an installation part and a diaphragm, the diaphragm corresponds to the airflow channel to seal the airflow channel, and the installation part is assembled in the installation cavity and is provided with an air passing channel. The electronic vacuum pump adopting the check valve can effectively improve the capability of preventing the electronic vacuum pump from invading foreign matters, and prevent the foreign matters from entering the pump body along with the air quickly sucked back when the vacuum pump stops working, thereby preventing the vacuum pump from being damaged.

Description

Check valve and electronic vacuum pump

Technical Field

The invention relates to the field of electronic vacuum pumps, in particular to a one-way valve and an electronic vacuum pump with the one-way valve.

Background

The automobile electronic vacuum pump is applied to an automobile braking system and is matched with a vacuum booster to finish brake boosting action. With the gradual improvement of the oil consumption and emission requirements of automobiles, energy-saving automobiles and new energy automobiles become the choice of more and more automobile manufacturers. Some traditional fuel automobile, the not enough condition of vacuum can appear in its vacuum helping hand braking system under some operating modes, leads to brake pedal can harden, and then probably leads to the braking distance increase, influences driving safety. At the moment, the electronic vacuum pump is started to provide a vacuum source for the electronic vacuum pump, so that the normal work of the vacuum booster can be ensured, and the driving safety is ensured. The mode that the electronic vacuum pump works as required can effectively save energy. For a new energy automobile which is not provided with a traditional engine or does not work under certain working conditions, an electronic vacuum pump can be used for providing a vacuum source for a vacuum boosting brake system of the new energy automobile.

The existing electronic vacuum pump stops working instantly because the external air pressure is greater than the air pressure in the vacuum pump, the external air is instantly sucked back into the vacuum pump under the pressure difference, external foreign matters also enter the vacuum pump along with the external air pressure, the vacuum pump is further damaged, a brake pedal is hardened, the braking distance is lengthened, and the potential safety hazard of driving braking exists.

Disclosure of Invention

Therefore, the invention provides the check valve and the electronic vacuum pump with the check valve, which can effectively reduce the possibility that external foreign matters enter the vacuum pump along with suck-back air at the moment when the vacuum pump stops working.

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the valve cover is provided with an installation cavity, an airflow channel and an installation opening, the airflow channel is communicated with the installation cavity, the valve core is assembled in the installation cavity of the valve cover, the valve core comprises an installation part and a diaphragm which are connected, the diaphragm corresponds to the airflow channel to block the airflow channel, and the installation part is assembled in the installation cavity and is provided with an airflow channel.

Furthermore, the valve cover is provided with an end part, the air flow channel is arranged on the end part, and the diaphragm corresponds to the inner wall of the end part.

Furthermore, a butting ring protrudes towards the mounting cavity from the inner wall of the end part, and the diaphragm butts against the butting ring; the airflow passage is located within the abutment ring.

Furthermore, the inner wall of the valve cover is also inwards recessed with a groove, and the groove is positioned at the periphery of the diaphragm; the outer peripheral surface of the valve cover close to one side of the mounting opening is an inclined guide surface which is obliquely arranged.

Furthermore, the number of the airflow channels is multiple, and the airflow channels correspond to the peripheral position of the diaphragm and are uniformly distributed; and/or the air passing channel is a notch arranged on the peripheral surface of the mounting part, and the number of the air passing channels is one or more.

Furthermore, the valve core also comprises a connecting part, and the connecting part is connected with the mounting part and the diaphragm; the connecting part is connected to the middle position of the diaphragm, the airflow channel corresponds to the peripheral position of the diaphragm, and the airflow channel is deformed through the peripheral position to be blocked or opened.

Furthermore, the valve core is of an integral connecting structure, the diameter of the connecting part is far smaller than that of the mounting part and the diaphragm, the valve core and the valve cover are both made of flexible materials, and the hardness of the valve cover is higher than that of the valve core.

An electronic vacuum pump comprises a vacuum pump main body and a one-way valve, wherein the one-way valve is arranged in an air outlet channel of the vacuum pump main body; the one-way valve is the one-way valve; the air flow channel of the one-way valve is communicated with the air inlet of the air outlet channel, and the air passing channel of the one-way valve is communicated with the air outlet of the air outlet channel.

Further, the vacuum pump main part is including the motor part and the pump body part that are connected, set up the gas outlet of holding tank and intercommunication holding tank on the motor flange end cover of motor part, the check valve assembles in the holding tank, be equipped with the sealing washer between motor part and the pump body part, the sealing washer still has the check valve fixed part that extends to between pump body part and the check valve.

Further, the pump body part comprises a silencing cover, a silencing pad and a pump chamber assembly, the silencing pad is arranged between the silencing cover and the pump chamber assembly and comprises a connecting ring and an elastic diaphragm arranged in the connecting ring, and the connecting ring, the elastic diaphragm and a cover plate of the pump chamber assembly jointly enclose to form an air inlet chamber; the silencing pad, the pump chamber assembly, the silencing cover and the accommodating groove of the motor flange end cover are jointly enclosed to form the air outlet channel, and the connecting ring of the silencing pad is also provided with an air passing hole for communicating the air inlet chamber and the air outlet channel; the one-way valve and one of the air passing holes are positioned in the same radial direction with the air inlet chamber as the center.

Furthermore, the installation part of the valve core is provided with a step protruding towards the end part of the installation opening or the bottom of the accommodating groove, and the step is positioned between the installation part and the bottom of the accommodating groove, so that an intermediate cavity communicated with the air outlet and the air passing channel is formed between the installation part and the bottom of the accommodating groove.

Through the technical scheme provided by the invention, the method has the following beneficial effects:

when the electronic vacuum pump works, 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 to the air outlet through the air passage of the installation part, and finally is discharged to the outside through the air outlet.

When the electronic vacuum pump stops working, because the external air pressure of the vacuum pump is greater than the internal air pressure of the vacuum pump, the diaphragm of the valve core is tightly attached to the inner cavity of the valve cover under the action of pressure difference and elasticity, and then the air flow channel is blocked, so that a seal is formed between the internal space of the vacuum pump and the external atmosphere, the external air flow of the vacuum pump cannot be quickly sucked back into the vacuum pump, and the possibility that external foreign matters such as liquid, particles and the like are sucked back into the pump body is greatly reduced.

Drawings

FIG. 1 is an exploded view of the check valve of the embodiment;

FIG. 2 is a sectional view of the check valve in the embodiment;

FIG. 3 is a sectional view of a valve cover of the check valve in the embodiment;

FIG. 4 is a schematic perspective view of a valve element of the check valve in the embodiment;

FIG. 5 is a front view of a valve element of the check valve in the embodiment;

FIG. 6 is a sectional view of a spool of the check valve in the embodiment;

FIG. 7 is a schematic external view of an electronic vacuum pump according to an embodiment;

FIG. 8 is a sectional view showing an electronic vacuum pump in the embodiment;

FIG. 9 is a top view of the electronic vacuum pump of the embodiment shown with the pump body hidden;

FIG. 10 is a schematic structural diagram of the electronic vacuum pump in the embodiment after the noise reduction cover is hidden;

FIG. 11 is a schematic structural diagram of the electronic vacuum pump in the embodiment after the noise reduction cover and the sealing ring are hidden;

FIG. 12 is a schematic structural view of the noise damping pad according to the embodiment;

FIG. 13 is a schematic view of the sound-damping cushion of the embodiment at another angle;

FIG. 14 is a sectional view of the silencing pad of the embodiment;

fig. 15 is a schematic structural view of the noise damping cover in the embodiment.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 6, the present embodiment provides a check valve 100, including a valve cover 10 and a valve core 20, where the valve cover 10 has a mounting cavity 101, and an air flow channel 111 and a mounting opening 102 communicating with the mounting cavity 101, the valve core 20 is mounted in the mounting cavity 101 of the valve cover 10, the valve core 20 includes a mounting portion 21 and a diaphragm 22 connected to each other, the diaphragm 22 corresponds to the air flow channel 111 to block the air flow channel 111, and the mounting portion 21 is mounted in the mounting cavity 101 and is provided with an air passing channel 211. In this embodiment, the tight fitting manner of the mounting portion 21 in the mounting cavity 101 is interference fit, transition fit, or other manners capable of achieving stable connection.

With continued reference to fig. 7 to 15, the present embodiment further provides an electronic vacuum pump, including a vacuum pump main body and a one-way valve, the one-way valve being disposed in the air outlet channel 60 of the vacuum pump main body; specifically, the check valve is the check valve 100 described above; the air flow channel 111 of the check valve 100 is communicated with the air inlet of the air outlet channel 60 (the air inlet is the air passing hole 4101 of the middle silencing pad 410 described below), and the air passing channel 211 of the check valve 100 is communicated with the air outlet 61 of the air outlet channel 60.

When the electronic vacuum pump works, 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 mounting cavity 101, flows to the air outlet 61 through the air passing channel 211 of the mounting part 21, and finally is discharged to the outside through the air outlet 61.

When the electronic vacuum pump stops working, because the external air pressure of the vacuum pump is greater than the internal air pressure of the vacuum pump, the diaphragm 22 of the valve core 20 is tightly attached to the inner cavity of the valve cover 10 under the action of pressure difference and elasticity, and then the air flow channel 111 is blocked, so that a seal is formed between the internal space of the vacuum pump and the external atmosphere, the external air flow of the vacuum pump cannot be quickly sucked back into the vacuum pump, and the possibility that external foreign matters such as liquid, particles and the like are sucked back into the pump body is greatly reduced.

Meanwhile, when the electronic vacuum pump does not work and is subjected to the condition of water immersion, liquid reversely enters from the air outlet 61, the diaphragm 22 of the valve core 20 can be tightly attached to the inner wall of the installation cavity 101 under the action of water pressure, so that the air flow channel 111 is well blocked, the liquid is effectively prevented from entering the electronic vacuum pump, even if water enters in a small amount, the internal elements of the electronic vacuum pump are effectively protected from being damaged, and the liquid intrusion resistance and robustness of the electronic vacuum pump are improved.

The one-way valve 100 has the characteristics of simple structure, low loss, long service life and the like compared with a structure of plugging by the elasticity of a spring in the prior art, wherein the action of the diaphragm 22 is mainly pushed by pressure difference.

Specifically, in this embodiment, the vacuum pump main body includes a motor portion 30 and a pump portion 40 connected to each other, the motor portion 30 includes a motor and a motor flange cover 31, and the motor of the motor portion 30 is connected to the pump portion 40 (specifically, connected to a rotor of a pump chamber assembly of the pump portion 40) to drive the pump chamber assembly to operate, so as to implement vacuum pumping. The motor flange end cover 31 of the motor part 30 is provided with an accommodating groove and a gas outlet (the gas outlet is a gas outlet 61 of the gas outlet channel 60) communicated with the accommodating groove, and the accommodating groove is a part of the gas outlet channel 60; the check valve 100 is assembled in the accommodating groove; a sealing ring 50 is arranged between the motor part 30 and the pump body part 40, and sealing is carried out through the sealing ring 50. During assembly, the one-way valve 100 is firstly installed in the accommodating groove, and then the sealing ring 50 and the pump body part 40 are covered and fixed to realize assembly; in this way, easy assembly of the check valve 100 is achieved.

Further, the sealing ring 50 further has a check valve fixing portion 51 extending between the pump body portion 40 and the check valve 100, so that the check valve 100 is pressed by the check valve fixing portion 51, and the check valve fixing portion 51 is pressed by the pump body portion 40, thereby ensuring that the check valve 100 is installed in place without axial movement. Meanwhile, the sealing ring 50 and the check valve fixing portion 51 are integrally formed, so that the production and installation are convenient.

Specifically, in the structure of the check valve 100, the valve cover 10 has an end portion 11, the air flow passage 111 opens on the end portion 11, and the diaphragm 22 corresponds to the inner wall of the end portion 11; when a pressure difference exists between the inside and the outside of the vacuum pump, the diaphragm 22 can be attached to the inner wall of the end portion 11 of the valve cover 10 to close the air flow passage 111.

The contact part of the inner wall of the valve cover 10 and the diaphragm 22 may be in interference fit or clearance fit in a natural state (before the vacuum pump exhausts air), but the diaphragm 22 is in close contact with the inner wall of the valve cover 10 due to the action of the internal and external pressure difference at the moment when the vacuum pump finishes, so as to form a sealing structure. When the contact part of the inner wall of the valve cover 10 and the diaphragm 22 is in clearance fit in a natural state (before the vacuum pump pumps air), the internal and external pressure difference overcomes the gravity of the valve core 20 to jack up the valve core 20, so that the diaphragm 22 of the valve core 20 is attached to the inner wall of the valve cover 10.

Furthermore, an abutting ring 12 is projected from the inner wall of the end part 11 to the inside of the mounting cavity 101, and the diaphragm 22 abuts against the abutting ring 12; the gas flow channel 111 is located within the abutment ring 12. The abutment ring 12 is provided to effectively improve the adhesion between the diaphragm 22 and the valve cover 10. Meanwhile, the diaphragm 22 of the valve core 20 and the abutting ring 12 of the valve cover 10 are always kept tightly attached to each other in the long-term use process of the check valve 100, the problem that the diaphragm 22 cannot be tightly attached to the valve cover 10 due to elastic failure in the long-term use process is avoided, and the reliability is better. Of course, in other embodiments, the raised abutting ring 12 may not be provided, such as being directly planar, and the diaphragm 22 may be attached to the planar inner wall of the valve cover 10 to close the air flow channel 111 by the internal and external pressure difference, which is only less effective than the abutting ring 12 during a long time use.

The inner wall of the valve cover 10 is also inwards recessed with a groove 13, and the groove 13 is positioned at the periphery of the diaphragm 22; in this embodiment, the groove 13 is located at the periphery of the abutting ring 12, and the arrangement of the groove 13 can provide an air flow avoiding or buffering space, prevent the generation of vortex and turbulence, and prevent the diaphragm 22 from generating an acoustic effect, i.e. avoid the generation of noise. In particular, the groove 13 is an annular groove.

The outer peripheral surface of the valve cover 10 close to the mounting opening 102 is an inclined guide surface 14 which is arranged obliquely, so that when the check valve 100 is assembled into the vacuum pump body, and is specifically assembled into the accommodating groove of the motor flange end cover 31, the inclined guide surface 14 has a guiding function, and is favorable for mounting and matching with the motor flange end cover 31.

Preferably, the number of the airflow channels 111 is two or more, more preferably, the number of the airflow channels 111 is three or more, in this embodiment, the number of the airflow channels 111 is five; in this manner, the gas 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 be used.

The structure of the valve cover 10 provided in the present embodiment is one of the preferable structures, however, in other embodiments, the structure of the valve cover 10 is not limited thereto, and the structure of the abutment ring 12, the cavity 13 and/or the inclined guide surface 14 may not be provided.

Specifically, the valve element 20 further includes a connecting portion 23, and the connecting portion 23 connects the mounting portion 21 and the diaphragm 22; the connecting portion 23 is connected to the middle portion of the diaphragm 22, so that the peripheral position of the diaphragm 22 can be deformed, the airflow channel 111 corresponds to the peripheral position of the diaphragm 22, and the airflow channel 111 is sealed or opened by deforming the peripheral position.

Specifically, the five air flow channels 111 are uniformly distributed and correspond to the peripheral position of the diaphragm 22, so that the acting force applied to the diaphragm 22 is more uniform during operation.

More specifically, in this embodiment, the diameter of the connecting portion 23 is much smaller than the diameter of the mounting portion 21 and the diaphragm 22, so that there is a larger space between the mounting portion 21 and the diaphragm 22 for the diaphragm 22 to deform and give way. Of course, in other embodiments, the connection manner of the mounting portion 21 and the diaphragm 22 is not limited to this, and may also be directly connected.

The installation part 21 of the valve core 20 is provided with a step 24 protruding from the end part facing the installation opening 102, the arrangement is such that, when the one-way valve 100 is installed in the vacuum pump main body, for example, when the one-way valve 100 is installed in the accommodating groove of the motor flange end cover 31, the one-way valve 100 can abut against the groove bottom of the accommodating groove through the step 24, thereby heightening the installation part 21, an intermediate cavity 62 communicating the air outlet and the air passing channel 211 is formed between the installation part 21 and the groove bottom of the accommodating groove, the air flow output through the air passing channel 211 flows out from the outlet formed at the groove bottom of the accommodating groove after passing through the intermediate cavity 62, and the air path blockage caused by the staggered outlet of the air passing channel 211 and the groove bottom of the accommodating groove during installation is prevented. Of course, in other embodiments, the step 24 may not be provided on the check valve, for example, a step structure may be formed on the bottom of the receiving groove.

The air passage 211 is a notch opened in the outer peripheral surface of the mounting portion 21, and the notch is easily processed. Of course, the air passage 211 may be a through hole structure.

Further, the valve core 20 is an integral connection structure, that is, the valve core 20 is made of an elastic material, and can be integrally formed by injection molding or the like, so that the valve core is easy to manufacture.

More specifically, the valve core 20 and the valve cover 21 are made of flexible materials and have a flexible sealing function. The hardness of the valve cover 10 is greater than that of the valve core 20, and the following conditions are satisfied: both waterproof by interference fit with the pump body portion 40 and smooth circulation of the air flow by preventing structural deformation are ensured.

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

Further, in the present embodiment, the pump body portion 40 includes a silencing cover 420, a silencing 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 for vacuum pumping.

The silencing pad 410 is arranged between the silencing cover 420 and the pump chamber assembly 430, the silencing pad 410 comprises a connecting ring 411 and an elastic diaphragm 412 arranged in the connecting ring 411, and the connecting ring 411, the elastic diaphragm 412 and the cover plate of the pump chamber assembly 430 jointly enclose to form the air inlet chamber 41; the air outlet channel 60 is formed by the accommodation grooves of the silencing pad 410, the pump chamber assembly 430, the silencing cover 420 and the motor flange end cover 31. The connecting ring 411 of the silencing pad 410 is also provided with an air passing hole 4101 for communicating the air inlet chamber 41 and the air outlet channel 60; the air flow pumped by the pump chamber assembly 430 is transferred to the inlet chamber 41, and then flows out to the outlet passage 60 through the vent holes 4101. Specifically, the number of the air passing holes 4101 is at least two, in this embodiment, two, and the air passing holes are uniformly distributed on the connection ring 411 of the silencing pad 410.

More specifically, as shown in fig. 8, 10, and 11, the check valve 100 and one of the venting holes 4101 are located in the same radial direction with the air inlet chamber 41 as the center, that is, the air inlet chamber 41, the check valve 100, and the corresponding venting hole 4101 are located on the same radial line.

The silencing cover 420 is provided with a silencing cover fixing ring 421 which is abutted to the peripheral region 4123 of the elastic diaphragm 412; thus, the silencing pad 410 can be well fixed, so that the silencing pad 410 can stably abut against the cover plate of the pump chamber assembly 430, and stable assembly of the silencing pad 410 is realized. More specifically, the silencing pad 410 and the silencing cover 420 are fixed by interference fit of the connecting ring 411 of the silencing pad 410 and the silencing cover fixing ring 421, so that the connecting ring 411 of the silencing pad 410 can be stably abutted against the cover plate of the pump chamber assembly 430.

The middle region 4121 of the elastic diaphragm 412 is raised in the direction of the sound-deadening cap 420 higher than the contact surface of the sound-deadening cap fixing ring 421 with the elastic diaphragm 412. So set up, increased the volume of air inlet chamber 41 to reinforcing amortization shock attenuation effect that can be fine.

Specifically, the abutting surface of the sound deadening cap fixing ring 421 abuts on the surface of the peripheral region 4123 of the elastic diaphragm 412, and therefore, the abutting surface of the sound deadening cap fixing ring 421 is substantially flush with the surface of the peripheral region 4123 of the elastic diaphragm 412, and therefore, the arching height of the middle region 4121 of the elastic diaphragm 412 is as shown in fig. 14 as a height h; is the distance between the lower surface of the central region 4121 and the upper surface of the peripheral region 4123.

Specifically, the arching of the central region 4121 of the elastic diaphragm 412 is a natural arching without external force, and is not a deformation caused by external force (e.g., air blowing).

The elastic diaphragm 412 and the silencing cover 420 are arranged at intervals, the connecting ring 411, the elastic diaphragm 412 and the silencing cover 420 together enclose to form a buffer chamber 42, the buffer chamber 42 and the air inlet chamber 41 are respectively positioned at the upper side and the lower side of the elastic diaphragm 412 (as shown in fig. 8), and the buffer chamber 42 gives a certain buffer distance to the elastic diaphragm 412 to prevent the air flow from contacting or beating the top of the silencing cover 420 when impacting.

The transition between the central region 4121 and the peripheral region 4123 of the elastomeric diaphragm 412 is achieved by an arcuate connecting segment 4122. That is, the resilient diaphragm 412 includes a central region 4121 at a central position, a peripheral region 4123 at a peripheral position, and an arcuate connecting segment 4122 connecting the central region 4121 and the peripheral region 4123. With this arrangement, the inner wall 41221 between the central region 4121 and the peripheral region 4123 is an arc-shaped inner wall, which has a guiding function, and can effectively improve the airflow impact resistance of the transverse section of the elastic diaphragm 412, thereby further preventing the airflow from contacting or beating the top of the muffling cover 420 during impact.

The silencing cover 420 is provided with a flow passage for communicating the inside and the outside of the buffer chamber 42, so that the gas (namely, the gas in the gas outlet passage 60) from the gas inlet chamber 41 passes through the flow passage to the buffer chamber 42, a gap between the top of the silencing pad 410 and the silencing cover 420 (namely, the space of the buffer chamber 42) is fully utilized, the space between the top of the silencing pad 410 and the silencing cover 420 is sacrificed due to the upward (namely, towards the silencing cover 420) arching of the elastic diaphragm 412 of the silencing pad 410, and the noise is further reduced. At the same time, the flow of air into the buffer chamber 42 is effective to counteract the upward deformation of the elastic diaphragm 412.

The connecting ring 411 of the sound-absorbing pad 410 further extends outward to form an annular wing 413, and the sound-absorbing cover 420 is further convexly provided with an outer convex ring 422 which is abutted to the annular wing 413 of the sound-absorbing pad 410, and the outer convex ring 422 is abutted to the annular wing 413 of the sound-absorbing pad 410. The silencing cover fixing ring 421 and the outer convex ring 422 are respectively abutted to the inner and outer positions of the connecting ring 411 of the silencing pad 410, so that dislocation of the silencing pad 410 caused by the action of air pressure difference is more effectively prevented.

Meanwhile, the specific implementation manner of the flow channel is as follows: the silencing cover fixing ring 421 and the outer convex ring 422 are both provided with notches, the notch of the silencing cover fixing ring 421 is defined as an inner notch 4211, and the notch of the outer convex ring 422 is defined as an outer notch 4221. The buffer chamber 42 communicates with the external air outlet passage through the inner and outer notches 4211 and 4221. Namely, the inner gap 4211 and the outer gap 4221 form a flow channel, and the structural design is simple. Of course, in other embodiments, the structure of the air passage is not limited thereto.

More specifically, the silencing cover fixing ring 421 is provided with two rotationally symmetric inner notches 4211, the outer convex ring 422 is provided with a plurality of circumferentially uniformly distributed outer notches 4221, and the positions of the inner notches 4211 and the outer notches 4221 are staggered. Further, the sound-absorbing pad 410 is further provided with two error-proof ribs 414, and the error-proof ribs 414 are rotationally symmetrical. The error-proof rib 414 is matched with the inner notch 4211 to realize positioning assembly, so that the position of the sound-absorbing pad 410 and the sound-absorbing cover 420 during installation can be ensured to be correct, for example, the position of the air passing hole 4101 of the sound-absorbing pad 410 is ensured to be aligned to the position with larger space distance between the sound-absorbing cover 420 and the sound-absorbing pad 410, and thus, the noise problem caused by the incorrect installation position of the sound-absorbing pad 410 can be well avoided. The mistake-proof rib 414 and the inner gap 4211 of the sound-absorbing cover fixing ring 421 are a fit clearance for ventilation. The silencing pad 410 is of an integral connecting structure, namely, the silencing pad can be integrally manufactured and formed in a mode of injection molding of a mold and the like, and the silencing pad is simple and convenient to manufacture.

The connection ring 411 is connected with the connection surface 4111 of the cover plate of the pump chamber assembly 430 in an arc shape, so that the noise reduction pad 410 is in line contact with the cover plate at the initial stage of contact, and has better fitting performance, better vibration absorption and noise reduction.

Further, in the present embodiment, the silencing pad 410 is provided with the first avoiding groove 416 for avoiding the mounting screw (defined as the first mounting screw 431) of the pump chamber assembly 430, and specifically, the number of the first avoiding grooves 416 is four, so that it can be ensured that the silencing pad 410 does not interfere with the mounting screw (i.e., the first mounting screw 425) of the pump chamber assembly 430.

Meanwhile, the air passing holes 4101 and the first avoiding groove 416 are arranged in a staggered manner, so that after installation, the first installing screws 431 are arranged on the periphery of the first avoiding groove 416, the range of the first avoiding groove 416 shielded by the first installing screws 431 is large, and the air passing holes 4101 are not sufficiently arranged in space, so that the air passing holes 4101 and the first avoiding groove 416 are arranged in a staggered manner, the layout space of the air passing holes 4101 is large, and the air passing holes 4101 cannot be shielded by the first installing screws 431.

More specifically, the muffling cover 420 is mounted on the motor portion 30 through the second mounting screw 440, and the muffling cover 420 is provided with a second avoiding groove 425 for avoiding the second mounting screw 440, so that the overall size can be reduced. Meanwhile, the concave structure of the second avoiding groove 425 of the muffling cover 420 makes the gap between the muffling pad 410 smaller, and therefore, in this embodiment, the air passing hole 4101 is further staggered with the second avoiding groove 425, so that the air passing hole 4101 can correspond to a larger gap between the muffling cover 420 and the muffling pad 410, thereby better reducing noise.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

1. A one-way valve characterized by: the valve cover is provided with an installation cavity, an airflow channel and an installation opening, the airflow channel is communicated with the installation cavity, the valve core is assembled in the installation cavity of the valve cover, the valve core comprises an installation part and a diaphragm which are connected, the diaphragm corresponds to the airflow channel to block the airflow channel, and the installation part is assembled in the installation cavity and is provided with an air passage.

2. The one-way valve of claim 1, wherein: the valve cover is provided with an end part, the airflow channel is arranged on the end part, and the diaphragm corresponds to the inner wall of the end part.

3. The one-way valve of claim 2, wherein: a butting ring protrudes towards the mounting cavity from the inner wall of the end part, and the diaphragm butts against the butting ring; the airflow passage is located within the abutment ring.

4. A one-way valve according to claim 1, 2 or 3, wherein: the inner wall of the valve cover is also inwards recessed with a groove, and the groove is positioned at the periphery of the diaphragm; the outer peripheral surface of the valve cover close to one side of the mounting opening is an inclined guide surface which is obliquely arranged.

5. The one-way valve according to claim 1 or 2, wherein: the number of the airflow channels is multiple, and the airflow channels correspond to the peripheral position of the diaphragm and are uniformly distributed; and/or the air passing channel is a notch arranged on the peripheral surface of the mounting part, and the number of the air passing channels is one or more.

6. The one-way valve of claim 1, wherein: the valve core also comprises a connecting part, and the connecting part is connected with the mounting part and the diaphragm; the connecting part is connected to the middle position of the diaphragm, the airflow channel corresponds to the peripheral position of the diaphragm, and the airflow channel is deformed through the peripheral position to be blocked or opened.

7. The one-way valve according to claim 1 or 6, wherein: the valve core is of an integral connecting structure, the diameter of the connecting part is far smaller than that of the mounting part and the diaphragm, the valve core and the valve cover are both made of flexible materials, and the hardness of the valve cover is higher than that of the valve core.

8. An electronic vacuum pump comprises a vacuum pump main body and a one-way valve, wherein the one-way valve is arranged in an air outlet channel of the vacuum pump main body; the method is characterized in that: the one-way valve is as claimed in any one of claims 1 to 7; the air flow channel of the one-way valve is communicated with the air inlet of the air outlet channel, and the air passing channel of the one-way valve is communicated with the air outlet of the air outlet channel.

9. An electronic vacuum pump as claimed in claim 8, wherein: the vacuum pump main part is including the motor part and the pump body part that are connected, set up the gas outlet of holding tank and intercommunication holding tank on the motor flange end cover of motor part, the check valve assembles in the holding tank, be equipped with the sealing washer between motor part and the pump body part, the sealing washer still has the check valve fixed part that extends to between pump body part and the check valve.

10. An electronic vacuum pump as claimed in claim 9, wherein: the pump body part comprises a silencing cover, a silencing pad and a pump chamber assembly, the silencing pad is arranged between the silencing cover and the pump chamber assembly, the silencing pad comprises a connecting ring and an elastic diaphragm arranged in the connecting ring, and the connecting ring, the elastic diaphragm and a cover plate of the pump chamber assembly jointly enclose to form an air inlet chamber; the silencing pad, the pump chamber assembly, the silencing cover and the accommodating groove of the motor flange end cover are jointly enclosed to form the air outlet channel, and the connecting ring of the silencing pad is also provided with an air passing hole for communicating the air inlet chamber and the air outlet channel; the one-way valve and one of the air passing holes are positioned in the same radial direction with the air inlet chamber as the center.

11. An electronic vacuum pump as claimed in claim 8, wherein: the installation department of case has the step in the bottom arch of the tank of the tip of orientation installation opening or holding tank, the step is located between the tank bottom of installation department and holding tank to make and form the middle chamber that communicates gas outlet and air passage between the tank bottom of installation department and holding tank.

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