CN110608304A

CN110608304A - One-way valve

Info

Publication number: CN110608304A
Application number: CN201911011458.6A
Authority: CN
Inventors: 章以露
Original assignee: Jiangxi Sanfeng Pharmaceutical Technology Co Ltd
Current assignee: Jiangxi Sanfeng Pharmaceutical Technology Co Ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2019-12-24

Abstract

The invention provides a one-way valve which comprises a valve cover, a valve seat and a valve plate assembly, wherein the valve cover is provided with a first channel, the valve seat is provided with a second channel, the valve cover covers the valve seat and forms a fluid flow channel with the valve seat, the valve seat comprises a base, a positioning guide pillar and a first magnet, the positioning guide pillar is convexly arranged on the base, the first magnet is connected with the base, the valve plate is arranged in the fluid flow channel and sleeved with the positioning guide pillar, the valve plate assembly comprises a second magnet, and the first magnet and the second magnet are arranged in a mutually exclusive mode; the one-way valve changes the opening and closing state through the relative position of the valve plate assembly and the first channel. The check valve provided by the invention uses the first magnet and the second magnet to be matched to form a magnetic suspension state, replaces a spring in the existing check valve, avoids the performance reduction of a vacuum pump caused by the problem of a single spring, prolongs the service life of the check valve, and has higher reliability in the use of magnetic suspension compared with the spring.

Description

One-way valve

Technical Field

The invention relates to the technical field of fluid control, in particular to a one-way valve.

Background

The existing vacuum pump is often applied to the production processes of petroleum, chemical industry, food and the like, and the check valve is an important element in the vacuum pump. Most check valves have an elastic member structure inside, which is an important structural component for ensuring the vacuum degree of the vacuum pump, and the elastic member structure is generally formed by a plurality of springs arranged in a ring shape. However, the elastic members in the check valve have fatigue life, and when one or more of the elastic members have problems, the performance of the whole vacuum pump is greatly reduced, and the use reliability is poor.

Disclosure of Invention

In view of the above, there is a need for an improved check valve.

The invention provides a one-way valve which comprises a valve cover, a valve seat and a valve plate assembly, wherein a first channel is formed in the valve cover, a second channel is formed in the valve seat, the valve cover covers the valve seat, a fluid flow channel is formed between the valve cover and the valve seat, the valve seat comprises a base, a positioning guide pillar and a first magnet, the positioning guide pillar is convexly arranged on the base, the first magnet is connected to the base, the valve plate is arranged in the fluid flow channel and sleeved with the positioning guide pillar, the valve plate assembly comprises a second magnet, and the first magnet and the second magnet are arranged in a mutually exclusive mode;

the valve plate assembly can respond to the change of fluid pressure, so that the one-way valve has a first state that the valve plate assembly is pressed on the inner wall of the valve cover and seals the first channel to ensure that the first channel is not communicated with the fluid flow channel; and the valve plate assembly is separated from the inner wall of the valve cover, so that the first channel is communicated with the fluid flow channel in a second state. In the check valve provided by the invention, the first magnet is matched with the second magnet, so that the valve plate assembly forms a magnetic suspension state relative to the first magnet, a spring in the existing check valve is replaced, the performance reduction of a vacuum pump caused by the problem of a single spring is avoided, the service life of the check valve is prolonged, and compared with the spring, the magnetic suspension has higher reliability in use.

In one embodiment of the present invention, the first magnet and/or the second magnet is a ring magnet; alternatively, the first and second electrodes may be,

the first magnet and/or the second magnet are formed by annularly enclosing a plurality of magnetic beads.

By the arrangement, the annular magnet is more uniform in stress and good in stability; the process for forming the annular magnet by enclosing the plurality of magnetic beads is simple and low in cost.

In one embodiment of the invention, the valve seat further comprises an anti-corrosion layer, the anti-corrosion layer wrapping the first magnet; and/or the presence of a catalyst in the reaction mixture,

the valve plate assembly comprises an anti-corrosion layer, and the anti-corrosion layer wraps the second magnet.

So set up, even the service environment of check valve is the great environment of corrosivity, also can guarantee that it has longer life, need not often to change the check valve, saves the manual operation cost.

In one embodiment of the present invention, the first magnet is embedded in the inside of the base.

So set up, the base can regard as the first magnet of protective layer protection, prevents that the wearing and tearing of check valve first magnet in the use are great, prolongs the life of first magnet to the life of extension check valve.

In one embodiment of the present invention, a split structure is adopted between the first magnet and the base.

So set up, base and first magnet can part processing, processing accomplish after only need with first magnet install on the base can, processing technology is simple, the flexibility is high, easy and simple to handle.

In an embodiment of the present invention, the check valve further includes an annular cover, the base is provided with an annular groove, the first magnet is installed in the annular groove, and the annular cover covers the first magnet and is connected to the base.

So set up, base and first magnet can be processed separately to the annular cover can play the effect of protection first magnet with the annular groove cooperation.

In one embodiment of the present invention, the valve seat further includes an anticorrosive coating, the anticorrosive coating is located between the annular groove and the first magnet, and the annular cover is an anticorrosive coating.

So set up, can further increase the corrosion resisting property of check valve, prolong the life of check valve.

In one embodiment of the present invention, the corrosion-resistant layer is made of teflon or stainless steel; and/or the presence of a catalyst in the reaction mixture,

the valve cover and the valve seat are made of stainless steel.

By the arrangement, the polytetrafluoroethylene and the stainless steel are both low-cost materials with better corrosion resistance, so that the check valve has better corrosion resistance, is applied to the fields of chemical engineering, food and the like, and the service life of the check valve is prolonged.

In one embodiment of the invention, one of the base and the valve cover forms a first step portion extending in the circumferential direction on the outer wall, and the other forms a second step portion on the inner wall; the first step part is clamped and covers the second step part.

So set up, base and valve gap looks lock can prevent effectively in the check valve use, and base and valve gap dislocation avoid fluid check valve circumference to reveal fluid, influence the availability factor of check valve.

In an embodiment of the present invention, a third channel is formed on the positioning guide pillar.

So set up, can guarantee that the inside atmospheric pressure of check valve is balanced, prevent that the both sides pressure differential of positioning the guide pillar in the check valve is too big, cause the atmospheric pressure to strike the valve block subassembly, avoid the valve block subassembly tremble too big when reciprocating motion.

In one embodiment of the invention, the valve cover and the base are fixedly connected through a screw.

So set up, be connected the fastening between valve gap and the base to it is simple and convenient to dismantle between the two, is convenient for change the second magnet.

Drawings

FIG. 1 is a cross-sectional view of a one-way valve in a first state according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a one-way valve in a second state in accordance with an embodiment of the present invention.

Fig. 3 is a schematic view of a valve cover according to an embodiment of the present invention from a first perspective.

Fig. 4 is a schematic structural view of the valve cover shown in fig. 3 at a second viewing angle.

Fig. 5 is a schematic structural view of the valve cover shown in fig. 3 at a third viewing angle.

Fig. 6 is a cross-sectional view of the valve cover shown in fig. 5.

FIG. 7 is a schematic view of a valve seat in an embodiment of the present invention from a first perspective.

Fig. 8 is a schematic view of the valve seat of fig. 7 from a second perspective.

Fig. 9 is a schematic view of the valve seat of fig. 7 from a third perspective.

Fig. 10 is a cross-sectional view of the valve seat shown in fig. 9.

FIG. 11 is a sectional view of the valve sheet assembly according to the first embodiment of the present invention, taken from a first viewing angle.

Fig. 12 is a sectional view of the valve sheet assembly in the first embodiment of the present invention at a second viewing angle.

Fig. 13 is a sectional view of the valve sheet assembly in the second embodiment of the present invention at a first viewing angle.

Fig. 14 is a sectional view of the valve sheet assembly in the second embodiment of the present invention, taken from a second viewing angle.

Fig. 15 is a sectional view of the valve sheet assembly in the third embodiment of the present invention, taken from a first viewing angle.

Fig. 16 is a sectional view of the valve sheet assembly in the third embodiment of the present invention, taken from a second viewing angle.

100. A one-way valve; 10. a valve cover; 20. a valve seat; 30. a valve plate assembly; 40. a fluid flow passage; 50. an anticorrosive layer; 11. a first channel; 21. a base; 22. positioning the guide post; 23. a second channel; 24. a first magnet; 31. a second magnet; 101. a first step portion; 102. a second step portion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, fig. 1 is a sectional view of a check valve 100 in a first state according to an embodiment of the present invention, and fig. 2 is a sectional view of the check valve 100 in a second state according to an embodiment of the present invention.

The present invention provides a check valve 100, also known as a check valve or a check valve, for controlling the direction of a fluid such that the fluid can flow in only one direction but not in the opposite direction. In the present embodiment, the check valve 100 is used in a vacuum pump. It is understood that in other embodiments, the check valve 100 may be used in other applications such as compressors, inflators, and the like.

An elastic part structure is arranged in the existing check valve, the elastic part structure is an important structural component for ensuring the vacuum degree of a vacuum pump, and the elastic part structure is generally formed by annularly arranging a plurality of springs. However, the elastic members in the check valve have fatigue life, and when one or more of the elastic members have problems, the performance of the whole vacuum pump is greatly reduced, and the use reliability is poor.

Referring to fig. 3 to 10 together, fig. 3 is a schematic structural view of a valve cover 10 according to an embodiment of the present invention at a first viewing angle, fig. 4 is a schematic structural view of the valve cover 10 shown in fig. 3 at a second viewing angle, fig. 5 is a schematic structural view of the valve cover 10 shown in fig. 3 at a third viewing angle, fig. 6 is a sectional view of the valve cover 10 shown in fig. 5, fig. 7 is a schematic structural view of a valve seat 20 according to an embodiment of the present invention at the first viewing angle, fig. 8 is a schematic structural view of the valve seat 20 shown in fig. 7 at the second viewing angle, fig. 9 is a schematic structural view of the valve seat 20 shown in fig. 7 at the third viewing angle, and fig. 10 is a sectional view of.

The invention provides a check valve 100, which comprises a valve cover 10, a valve seat 20 and a valve plate assembly 30, wherein the valve cover 10 is provided with a first channel 11, the valve seat 20 is provided with a second channel 23, the valve cover 10 covers the valve seat 20 and forms a fluid flow channel 40 with the valve seat 20, the valve seat 20 comprises a base 21, a positioning guide pillar 22 and a first magnet 24, the positioning guide pillar 22 is convexly arranged on the base 21, the first magnet 24 is connected with the base 21, the valve plate is arranged in the fluid flow channel 40 and sleeved with the positioning guide pillar 22, the valve plate assembly 30 comprises a second magnet 31, and the first magnet 24 and the second magnet 31 are arranged in a mutually exclusive manner;

the valve plate assembly 30 can respond to the change of the fluid pressure, so that the check valve 100 has a first state that the valve plate assembly 30 is pressed on the inner wall of the valve cover 10 and seals the first channel 11, and the first channel 11 is not communicated with the fluid flow passage 40; and a second state in which the valve plate assembly 30 is separated from the inner wall of the valve cover 10 to allow the first passage 11 to communicate with the fluid flow passage. The check valve 100 of the present invention uses the magnetic force between the first magnet 24 and the second magnet 31 to realize fluid flow in only one direction. The working process is that under the state of no stress of the check valve 100, the repulsive force between the second magnet 31 and the first magnet 24 makes the valve sheet assembly 30 in a magnetic suspension state relative to the first magnet 24, the valve sheet assembly 30 is pressed on the inner wall of the valve cover 10 and seals the first channel 11, and at this time, the first channel 11 is not communicated with the fluid flow channel 40. When fluid flows from the valve cover 10 side to the valve seat 20 side and the fluid pressure is greater than the magnetic repulsive force between the first magnet 24 and the valve plate assembly 30, the fluid pressure makes the valve plate assembly 30 move away from the valve cover 10 and towards the base 21, at this time, the first channel 11 is communicated with the fluid flow channel 40, and gas can flow from the valve cover 10 side to the valve seat 20 side through the check valve 100; when fluid flows from the valve cover 10 side to the valve seat 20 side but the fluid pressure is less than the magnetic repulsion force between the first magnet 24 and the valve plate assembly 30, the fluid pressure is not enough to push the valve plate assembly 30, the valve plate assembly 30 still fits on the inner wall of the valve cover 10 and seals the first channel 11, and the fluid cannot pass through the check valve. When the fluid flows from the valve seat 20 side to the valve cover 10 side, the valve plate assembly 30 cannot be pushed, the valve plate assembly 30 is maintained in a state of sealing the first passage 11, the fluid cannot pass through the first passage 11, and the fluid cannot flow out of the valve cover 10 from the valve seat 20 side through the check valve 100, that is, the fluid cannot flow backward.

It is understood that, in order to prevent the valve cover 10 and the valve seat 20 from acting on the first magnet 24 and/or the second magnet 31 to hinder the magnetic force between the first magnet 24 and the second magnet 31, the valve cover 10 and the valve seat 20 should be made of paramagnetic materials, specifically, the paramagnetic materials should be materials that cannot respond to magnetism, that is, materials that cannot be attracted by magnets. In addition, the repelling arrangement means that the S pole of the first magnet 24 is arranged opposite to the S pole of the second magnet, or the N pole of the first magnet 24 is arranged opposite to the N pole of the second magnet 31, so as to realize a magnetic suspension structure between the valve seat 20 and the valve plate assembly 30. In addition, the check valve 100 provided by the invention can be applied to the field of gas circulation and can also be applied to the field of liquid circulation.

In the check valve 100 provided by the invention, the first magnet 24 and the second magnet 31 are matched to enable the valve plate assembly 30 to form a magnetic suspension state relative to the valve seat 20, so that a spring in the existing check valve 100 is replaced, the performance reduction of a vacuum pump caused by the problem of a single spring is avoided, the service life of the check valve 100 is prolonged, and compared with the spring, the reliability of magnetic suspension is higher during use.

Because the existing vacuum pump is often applied to the production process of corrosive environments such as petroleum, chemical engineering, food and the like, the one-way valve in the corrosive environment has short service life and needs to be replaced frequently, and the cost of manual equipment is increased; even corroded check valves can produce debris and contaminate the production process. Therefore, when designing a check valve, the corrosion resistance of the check valve is also considered.

In one embodiment of the present invention, the valve seat 20 further includes a corrosion protection layer 50, the corrosion protection layer 50 wrapping the first magnet 24; and/or the presence of a catalyst in the reaction mixture,

the valve sheet assembly 30 includes an anti-corrosion layer 50 wrapping the second magnet 31.

With the arrangement, even if the use environment of the check valve 100 is a relatively corrosive environment (for example, the use environment of the check valve 100 is filled with corrosive gas such as hydrogen chloride gas and the like, or corrosive liquid such as sulfuric acid and the like), the check valve 100 can be ensured to have a relatively long service life, the check valve 100 does not need to be replaced frequently, and the manual operation cost is saved.

Referring to fig. 11 to 16 together, fig. 11 is a sectional view of a valve plate assembly 30 according to a first embodiment of the present invention at a first viewing angle, fig. 12 is a sectional view of the valve plate assembly 30 according to the first embodiment of the present invention at a second viewing angle, fig. 13 is a sectional view of the valve plate assembly 30 according to a second embodiment of the present invention at the first viewing angle, fig. 14 is a sectional view of the valve plate assembly 30 according to the second embodiment of the present invention at the second viewing angle, fig. 15 is a sectional view of the valve plate assembly 30 according to a third embodiment of the present invention at the first viewing angle, and fig. 16 is a sectional view of the valve plate assembly 30 according to the third embodiment of the present invention at the second viewing angle.

In one embodiment of the present invention, the first magnet 24 and/or the second magnet 31 are ring magnets; alternatively, the first and second electrodes may be,

the first magnet 24 and/or the second magnet 31 are formed by annularly enclosing a plurality of magnetic beads.

It is understood that the first magnet 24 and the second magnet 31 may be both integrated annular magnets or both point-shaped magnets assembled to form a ring, or one of the first magnet 24 and the second magnet 31 may be integrated annular magnet and the other may be point-shaped magnets assembled to form a ring.

By the arrangement, the annular magnet is more uniform in stress and good in stability; a plurality of magnetic beads enclose and establish into annular magnet molding process simple, and is with low costs, no matter annular magnet or a plurality of magnetic beads enclose and establish into the annular, and the stability in use of check valve 100 all is higher than the check valve who takes a plurality of springs in the prior art.

In the invention, the first magnet 24 and the second magnet 31 both adopt magnetic steel, and the magnetic steel is simple and easy to obtain, low in cost and long in service life. It will be appreciated that in other embodiments, other permanent magnetic materials may be used, and the magnetic material may be selected as appropriate.

In one embodiment of the present invention, the corrosion protection layer 50 is made of teflon or stainless steel; and/or the presence of a catalyst in the reaction mixture,

the valve cover 10 and the valve seat 20 are made of stainless steel.

So set up, polytetrafluoroethylene and stainless steel material not only can prevent corrosion, still very wear-resisting, and protection valve block subassembly 30 is less at reciprocating motion's in-process wearing and tearing, prolongs its life to the cost is lower, can improve product competitiveness. It is understood that in other embodiments, other corrosion-resistant and wear-resistant materials may be used, and a wear-resistant layer may be added outside the corrosion-resistant layer. The check valve 100 has good corrosion resistance, and can be applied to the fields of chemical industry, food and the like, and the service life of the check valve 100 is prolonged.

In one embodiment, the second magnet 31 is a ring magnet, the valve sheet assembly 30 is formed by coating a polytetrafluoroethylene anticorrosive coating 50 on the second magnet 31, and the anticorrosive coating 50 is processed into a ring shape with a rectangular cross section, as shown in fig. 11 and 12.

In one embodiment, the second magnet 31 is a plurality of magnetic beads, the plurality of magnetic beads are surrounded to form a ring, the second magnet 31 is covered with a polytetrafluoroethylene anticorrosive layer 50 to form the valve sheet assembly 30, and the anticorrosive layer 50 is processed into a ring with a rectangular cross section, as shown in fig. 13 and 14.

In one embodiment, the second magnet 31 is a plurality of magnetic beads, and the plurality of magnetic beads are surrounded to form a ring shape, the second magnet 31 is covered with a stainless steel anticorrosive layer 50 to form the valve sheet assembly 30, and the stainless steel processing technology is mature, and the anticorrosive layer 50 can be processed to be a ring shape with a "T" shaped cross section to increase the cross-sectional area of the fluid flowing in the fluid flow channel 40 and increase the flow rate of the check valve, as shown in fig. 15 and 16.

In one embodiment of the present invention, the first magnet 24 and the base 21 are separated from each other.

So set up, base 21 and first magnet 24 can part processing, processing accomplish after only need with first magnet 24 install on base 21 can, processing technology is simple, the flexibility is high, easy and simple to handle.

In one embodiment of the present invention, the first magnet 24 is embedded inside the base 21.

With the arrangement, the base 21 can serve as a protective layer to protect the first magnet 24, so that the first magnet 24 is prevented from being worn greatly in the use process of the check valve 100, the service life of the first magnet 24 is prolonged, and the service life of the check valve 100 is prolonged.

In one embodiment of the present invention, the check valve 100 further includes an annular cover (not shown), the base 21 is provided with an annular groove (not shown), the first magnet 24 is installed in the annular groove, and the annular cover covers the first magnet 24 and is connected to the base 21.

So configured, the base 21 and the first magnet 24 may be machined separately, and the annular cover in cooperation with the annular groove may serve to protect the first magnet 24.

In one embodiment of the invention, an anti-corrosion layer 50 is provided between the annular groove and the first magnet 24, and the annular cover is the anti-corrosion layer 50.

In the present invention, the anticorrosive coating 50 between the annular groove and the first magnet 24 and the annular cover are also made of teflon or stainless steel.

By the arrangement, the anti-corrosion performance of the check valve 100 can be further improved, the processing is convenient, and the service life of the check valve 100 is prolonged.

In one embodiment of the present invention, a third channel (not shown) is formed on the positioning guide pillar 22.

So set up, can guarantee that the inside atmospheric pressure of check valve 100 is balanced, prevent that the both sides pressure differential of positioning guide pillar 22 in check valve 100 is too big, cause the atmospheric pressure to strike valve block assembly 30, avoid valve block assembly 30 tremble too big when reciprocating motion.

In one embodiment of the present invention, one of the base 21 and the valve cover 10 forms a first step portion 101 extending in the circumferential direction on the outer wall, and the other forms a second step portion 102 on the inner wall; the first step portion 101 is engaged with and covers the second step portion 102.

So set up, base 21 and valve gap 10 looks lock can prevent effectively that in the use of check valve 100, base 21 and valve gap 10 misplace, avoid fluid check valve 100 circumference to reveal fluid, influence the availability factor of check valve 100.

In one embodiment of the present invention, the valve cover 10 and the base 21 are fixedly connected by a screw.

With the arrangement, the valve cover 10 and the base 21 are connected tightly, and the valve cover 10 and the base 21 are easy to detach, so that the valve plate assembly 30 can be replaced conveniently.

In the check valve 100 provided by the invention, the first magnet 24 and the second magnet 31 are matched to enable the valve plate assembly 30 to form a magnetic suspension state relative to the first magnet 24, so that a spring in the existing check valve 100 is replaced, the performance reduction of a vacuum pump caused by the problem of a single spring is avoided, the service life of the check valve 100 is prolonged, and compared with the spring, the reliability of magnetic suspension is higher during use.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.

Claims

1. A one-way valve (100) is characterized by comprising a valve cover (10), a valve seat (20) and a valve plate component (30), a first channel (11) is arranged on the valve cover (10), a second channel (23) is arranged on the valve seat (20), the valve cover (10) is covered on the valve seat (20) and forms a fluid flow passage (40) with the valve seat (20), the valve seat (20) comprises a base (21), a positioning guide post (22) and a first magnet (24), the positioning guide post (22) is convexly arranged on the base (21), the first magnet (24) is connected to the base (21), the valve plate is arranged in the fluid flow passage (40) and sleeved with the positioning guide pillar (22), the valve plate assembly (30) comprises a second magnet (31), and the first magnet (24) and the second magnet (31) are arranged in a repulsive manner;

the valve plate assembly (30) can respond to the change of fluid pressure, so that the one-way valve (100) has a first state that the valve plate assembly (30) is pressed on the inner wall of the valve cover (10) and seals the first channel (11), and the first channel (11) is not communicated with the fluid flow channel (40); and the valve plate assembly (30) is away from the inner wall of the valve cover (10) to enable the first channel (11) and the fluid flow channel to be communicated in a second state.

2. The non-return valve (100) according to claim 1, characterised in that the first magnet (24) and/or the second magnet (31) are ring magnets; alternatively, the first and second electrodes may be,

the first magnet (24) and/or the second magnet (31) are formed by annularly surrounding a plurality of magnetic beads.

3. The check valve (100) of claim 1, wherein the valve seat (20) further comprises a corrosion resistant layer (50), the corrosion resistant layer (50) encasing the first magnet (24); and/or the presence of a catalyst in the reaction mixture,

the valve plate assembly (30) further comprises an anti-corrosion layer (50), and the second magnet (31) is wrapped by the anti-corrosion layer (50) of the second magnet (31).

4. The check valve (100) of claim 1, wherein the first magnet (24) is embedded within the seat (21).

5. The check valve (100) of claim 4 wherein a split structure is employed between the first magnet (24) and the base (21).

6. The check valve (100) of claim 5, wherein the check valve (100) further comprises an annular cover, wherein an annular groove is formed in the base (21), the first magnet (24) is mounted in the annular groove, and the annular cover covers the first magnet (24) and is connected to the base (21).

7. The check valve (100) of claim 6, wherein the valve seat (20) further comprises a corrosion protection layer (50), the corrosion protection layer (50) is located between the annular groove and the first magnet (24), and the annular cover is the corrosion protection layer (50).

8. The non-return valve (100) according to claim 3 or 7, characterised in that the anti-corrosion layer (50) is of teflon or stainless steel; and/or the presence of a catalyst in the reaction mixture,

the valve cover (10) and the valve seat (20) are made of stainless steel.

9. The check valve (100) of claim 1, wherein one of the seat (21) and the valve cover (10) forms a first step (101) on an outer wall extending in a circumferential direction, and the other forms a second step (102) on an inner wall; the first step part (101) is clamped and covers the second step part (102).

10. The check valve (100) of claim 1, wherein a third channel is formed on the positioning guide pillar (22), and the third channel is communicated with the fluid flow channel (40); and/or the presence of a catalyst in the reaction mixture,

the valve cover (10) is fixedly connected with the base (21) through a threaded piece.