CN110594128A

CN110594128A - Vacuum pump

Info

Publication number: CN110594128A
Application number: CN201911011153.5A
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: 2019-12-20
Anticipated expiration: 2039-10-23
Also published as: CN110594128B

Abstract

The invention provides a vacuum pump which comprises a pump body, a piston, a push rod and a one-way valve, wherein a first channel is formed in the pump body, the piston is contained in the first channel, and the push rod is connected with the piston and can drive the piston to move in the first channel; the pump body is also provided with an air inlet and an air outlet, and at least two check valves are respectively arranged at the air inlet and the air outlet; the one-way valve is opened and closed by a magnetic suspension structure. The vacuum pump provided by the invention has the advantages that the magnetic suspension state is formed in the check valve inside the vacuum pump, the spring in the existing check valve is replaced, the problem of performance reduction of the vacuum pump caused by the problem of the individual spring is solved, and compared with the spring, the magnetic suspension has higher reliability in use, the service life of the check valve is prolonged, and the service life of the vacuum pump is prolonged.

Description

Vacuum pump

Technical Field

The invention relates to the field of pumps, in particular to a vacuum pump.

Background

The existing vacuum pump is often applied to the production process of corrosive environments such as petroleum, chemical engineering, food and the like, and the check valve is an important element in the vacuum pump. Most vacuum pumps are made of metal materials and are internally provided with spring structures, the spring structures are very important structural components for ensuring the vacuum degree of the vacuum pumps, and once the spring structures are corroded, the performance of the vacuum pumps is greatly reduced.

Disclosure of Invention

In view of the above, there is a need for an improved vacuum pump.

The invention provides a vacuum pump which comprises a pump body, a piston, a push rod and a one-way valve, wherein an air cavity is formed in the pump body, the piston is contained in the air cavity, and the push rod is connected with the piston and can drive the piston to move in the air cavity; the pump body is also provided with an air inlet and an air outlet, and at least two one-way valves are respectively arranged at the air inlet and the air outlet;

the check valve comprises a valve cover, a valve seat and a valve block 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 block is arranged in the fluid flow channel and sleeved with the positioning guide pillar, the valve block 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.

According to the vacuum pump provided by the invention, the first magnet and the second magnet in the one-way valve inside the vacuum pump are matched, so that the valve plate assembly forms a magnetic suspension state relative to the first magnet, a spring in the conventional one-way valve is replaced, the problem of performance reduction of the vacuum pump caused by the problem of individual springs is solved, and compared with the spring, the magnetic suspension is higher in reliability during use, the service life of the one-way valve is prolonged, and the service life of the vacuum pump is prolonged.

In an embodiment of the present invention, the vacuum pump further includes a first cylinder head and a second cylinder head, the first cylinder head and the second cylinder head are respectively disposed at two sides of the pump body, the first cylinder head is provided with a water inlet, and the second cylinder head is provided with a water outlet.

So set up, water inlet and outlet set up respectively in the both sides of the pump body, let in after the cold water can evenly take away the heat that the piston produced when the air cavity moves, avoid the piston to cause local high temperature when the air cavity motion, long-time use influences the vacuum pump life-span, produces the potential safety hazard even.

In one embodiment of the invention, a channel is arranged in the first cylinder head, and the push rod is inserted into the channel and connected with the piston; and a sealing element is also arranged in the channel and is positioned between the first cylinder head and the push rod.

So set up, adopt the sealing member sealed first cylinder end and push rod, make gas can only get into, the gas vent is discharged by the air inlet, avoid gas to escape in passageway department, influence the vacuum degree of vacuum pump.

In one embodiment of the present invention, the number of the air inlets is two; and/or, the number of the exhaust ports is two.

So set up, two air inlets can mutually support with two gas vents, improve the work efficiency of vacuum pump.

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

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 further comprises an anti-corrosion layer, and the second magnet 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 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 an embodiment of the present invention, the first magnet is embedded in the base, or a separate structure is adopted between the first magnet and the base.

According to the arrangement, the first magnet is embedded in the base, and the base can serve as a protective layer to protect the first magnet, so that the first magnet is prevented from being greatly abraded in the use process of the check valve, the service life of the first magnet is prolonged, and the service life of the check valve is prolonged; adopt the components of a whole that can function independently structure between first magnet and the base, base and first magnet can part processing, only need after the processing accomplish with first magnet install on the base can, processing technology is simple, the flexibility is high, easy and simple to handle.

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, and the third channel is communicated with the fluid flow channel.

So set up, can guarantee that the inside atmospheric pressure of check valve is balanced, prevent that the inside pressure differential of check valve is too big, cause the atmospheric pressure to strike the second magnet, avoid the second magnet 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 schematic structural diagram of a vacuum pump in an embodiment of the present invention from a first perspective.

Fig. 2 is a schematic structural diagram of the vacuum pump shown in fig. 1 under a second view angle.

Fig. 3 is a schematic structural diagram of the vacuum pump shown in fig. 1 under a third view angle.

Figure 4 is a cross-sectional view of the vacuum pump of figure 1.

FIG. 5 is a cross-sectional view of a one-way valve in a first state according to one embodiment of the present invention.

FIG. 6 is a cross-sectional view of a one-way valve in a second state in accordance with an embodiment of the present invention.

Fig. 7 is a schematic view of a valve cover according to an embodiment of the present invention from a first perspective.

Fig. 8 is a schematic structural view of the valve cover shown in fig. 7 at a second viewing angle.

Fig. 9 is a schematic structural view of the valve cover shown in fig. 7 at a third viewing angle.

Fig. 10 is a cross-sectional view of the valve cover of fig. 9.

FIG. 11 is a schematic view of a valve seat in a first perspective of an embodiment of the present invention.

Fig. 12 is a schematic view of the valve seat of fig. 11 from a second perspective.

FIG. 13 is a schematic view of the valve seat of FIG. 11 from a third perspective.

FIG. 14 is a cross-sectional view of the valve seat shown in FIG. 13.

FIG. 15 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. 16 is a sectional view of the valve sheet assembly according to the first embodiment of the present invention, taken from a second perspective.

Fig. 17 is a sectional view of the valve sheet assembly in the second embodiment of the present invention at a first viewing angle.

Fig. 18 is a sectional view of the valve sheet assembly in the second embodiment of the present invention, taken from a second viewing angle.

Fig. 19 is a sectional view of the valve sheet assembly in the third embodiment of the present invention, taken from a first viewing angle.

Fig. 20 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; 200. a vacuum pump; 210. a pump body; 220. a piston; 230. a push rod; 240. an air intake chamber; 250. an exhaust chamber; 260. tightening the clamp; 270. a first cylinder head; 280. a second cylinder head; 211. an air inlet; 212. an exhaust port; 213. a flow-through hole; 221. a protective layer; 222. a piston ring; 231. a seal member; 241. an air inlet chamber sealing cover; 251. an exhaust chamber sealing cover; 261. a fixed seat; 262. a clamping jaw; 271. a water inlet; 281. a water outlet; 282. a fixing member; 291. an air inlet pipe; 292. an air inlet flange; 293. an exhaust pipe; 294. an exhaust flange.

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 to 4, fig. 1 is a schematic structural diagram of a vacuum pump 200 according to an embodiment of the present invention from a first perspective, fig. 2 is a schematic structural diagram of the vacuum pump 200 shown in fig. 1 from a second perspective, fig. 3 is a schematic structural diagram of the vacuum pump 200 shown in fig. 1 from a third perspective, and fig. 4 is a cross-sectional view of the vacuum pump 200 shown in fig. 1.

The present invention provides a vacuum pump 200 which sucks, compresses and discharges gas by reciprocating a piston 220 in a pump chamber. In the present embodiment, the vacuum pump 200 is used in a field where the external environment is corrosive, such as petroleum, chemical industry, and food. It is understood that in other embodiments, the vacuum pump 200 may be applied to other types of non-corrosive technologies.

The vacuum pump 200 comprises a pump body 210, a piston 220, a push rod 230 and a one-way valve 100, wherein an air cavity (not numbered) is formed in the pump body 210, the piston 220 is accommodated in the air cavity, and the push rod 230 is connected with the piston 220 and can drive the piston 220 to move in the air cavity; the pump body 210 further has an air inlet 211 and an air outlet 212, and at least two check valves 100 are respectively disposed at the air inlet 211 and the air outlet 212.

The working principle of the vacuum pump 200 is: the air enters the air cavity through the one-way valve 100 of the air inlet 211, the push rod 230 drives the piston 220 to move in the air cavity and compress the air, and the compressed air is discharged from the one-way valve 100 of the air outlet 212, so that one cycle is completed. It can be understood that the check valve 100 at the gas inlet 211 functions to make the gas flow only along the direction from the gas inlet 211 to the gas cavity, but not in the opposite direction; the one-way valve 100 at the outlet port 212 functions to allow gas to flow only in the direction of the chamber towards the outlet port 212 and not in the reverse direction.

In the present embodiment, the check valve 100 of the intake port 211 is identical in structure to the check valve 100 of the exhaust port 212. It will be appreciated that in other embodiments, the two check valves 100 are of different configurations.

In this embodiment, the outer peripheral wall of the piston 220 is provided with the protective layer 221, so that the piston 220 is in soft contact with the inner wall of the air cavity, thereby avoiding abrasion of the inner wall of the air cavity and shortening the service life of the pump body 210. Preferably, the outer wall of the piston 220 is further provided with a piston ring 222 along the circumferential direction, and the piston ring 222 is also made of a flexible material, so as to ensure the sealing property between the piston 220 and the inner wall of the air cavity, and further ensure the vacuum degree of the vacuum pump 200. Specifically, the protective layer 221 is made of rubber, and the piston ring 222 is a rubber ring. It will be appreciated that in other embodiments, the protective layer 221 and the piston ring 222 may be made of other flexible materials such as plastic, so long as soft contact between the piston 220 and the inner wall of the air chamber and good sealing performance can be ensured.

In the present embodiment, the piston 220 and the push rod 230 are riveted. It is understood that in other embodiments, the piston 220 and the push rod 230 may be connected by welding, screwing, or the like, or may be formed as an integral structure.

In this embodiment, the push rod 230 is connected to the power unit through an external crankshaft to enable the push rod 230 to move in the air chamber.

In this embodiment, the vacuum pump 200 further includes an intake chamber 240 and an exhaust chamber 250, the intake chamber 240 is provided with an intake chamber sealing cover 241, the intake chamber sealing cover 241 is used for sealing the intake chamber 240, and the intake port 211 is located in the intake chamber 240; an exhaust chamber sealing cover 251 is provided on the exhaust chamber 250, the exhaust chamber sealing cover 251 is used for sealing the exhaust chamber 250, and the exhaust port 212 is located in the exhaust chamber 250. Specifically, an inlet chamber sealing cover 241 is fixed to the outer wall of the inlet chamber 240 by screws, and an outlet chamber sealing cover 251 is fixed to the outer wall of the outlet chamber 250 by screws. It will be appreciated that in other embodiments, the sealing cap may be secured by a snap, rivet, or other means.

In this embodiment, the vacuum pump 200 further includes a tightening clamp 260, and the tightening clamp 260 can fix the check valve 100 in the intake chamber 240 or the exhaust chamber 250. Specifically, the fastening fixture 260 includes a fixing seat 261 and a clamping jaw 262, the fixing seat 261 is used for fixing the fastening fixture 260 to the pump body 210, the clamping jaw 262 is used for fixing the check valve 100 at the air inlet 211 or the air outlet 212, the opening angle of the clamping jaw 262 is adjustable, and the angle between the clamping jaw 262 and the fixing seat 261 is also adjustable. It is understood that in other embodiments, the opening angle of the clamping jaw 262 and the angle between the clamping jaw 262 and the fixed seat 261 may be constant, as long as the one-way valve 100 can be matched.

In an embodiment of the present invention, the vacuum pump 200 further includes a first cylinder head 270 and a second cylinder head 280, the first cylinder head 270 and the second cylinder head 280 are respectively disposed at two sides of the pump body 210, the first cylinder head 270 is provided with a water inlet 271, and the second cylinder head 280 is provided with a water outlet 281.

So set up, water inlet 271 and outlet 281 set up respectively in the both sides of pump body 210, let in after the cold water can evenly take away the heat that piston 220 produced when the air cavity moves, cause local high temperature when avoiding piston 220 to move in the air cavity, long-time use influences the life-span of vacuum pump 200, even produces the potential safety hazard.

In this embodiment, the second cylinder head 280 is fixed to the pump body 210 by screws. It is understood that in other embodiments, the second cylinder head 280 and the pump body 210 may be fixed by a snap connection, welding, or other methods.

In one embodiment of the present invention, a channel is formed in the first cylinder head 270, and the push rod 230 is inserted into the channel and connected to the piston 220; a seal 231 is also disposed within the channel, the seal 231 being located between the first cylinder head 270 and the pushrod 230.

With such an arrangement, the sealing member 231 is used to seal the first cylinder head 270 and the push rod 230, so that gas can only enter from the gas inlet 211 and be exhausted from the gas outlet 212, thereby preventing the gas from escaping from the channel and affecting the vacuum degree of the vacuum pump 200. In this embodiment, the seal 231 is a flexible material. Specifically, the sealing member 231 is a rubber member. It will be appreciated that in other embodiments, the seal 231 may be made of other flexible materials.

In one embodiment of the present invention, there are two air inlets 211; and/or, two exhaust ports 212.

So set up, two air inlets 211 and two exhaust ports 212 can mutually support, improve vacuum pump 200's work efficiency. In the practical application process, the two air inlets 211 and the two air outlets 212 are opened in a crossed manner, specifically, as shown in the vacuum pump 200 structure shown in fig. 4, the check valve 100 at the upper left corner and the check valve 100 at the lower right corner are opened and closed simultaneously, and the check valve 100 at the upper right corner and the check valve 100 at the lower left corner are opened and closed simultaneously, so that the piston 220 completes one-time gas compression and discharge when moving upwards, and also completes one-time gas compression and discharge when moving downwards, and the working efficiency of the vacuum pump 200 can be improved by nearly one time.

In this embodiment, the air inlet 211 and the air outlet 212 are respectively disposed on the inner wall of the air cavity along the two axial sides of the push rod 230, and the first cylinder head 270 and the second cylinder head 280 are both parallel to the axial direction of the piston 220 and are respectively disposed on the two sides of the air cavity; that is, in the orientation shown in fig. 4, the intake port 211 is provided on the inner wall of the air chamber on the right side, the exhaust port 212 is provided on the inner wall of the air chamber on the left side, the first cylinder head 270 is provided on the lower side of the air chamber, and the second cylinder head 280 is provided on the upper side of the air chamber.

With the arrangement, the water inlet 271 is arranged on the first cylinder head 270 on the relatively lower side, the water outlet 281 is arranged on the second cylinder head 280 on the relatively upper side, and when cold water enters from the water inlet 271 and flows out from the water outlet 281, heat generated by friction between the piston 220 and the inner wall of the air cavity in the air cavity can be maximally exchanged with the cold water, so that the heat exchange effect is good.

In the present embodiment, when the push rod 230 moves to the extreme position of the piston 220, i.e., in the direction shown in fig. 4, when the push rod 230 moves to the uppermost end or the lowermost end of the air chamber, there is a flow hole 213 between the piston 220 and the inlet/outlet ports 211/212.

With such arrangement, when the piston 220 moves to the uppermost end or the lowermost end of the air cavity, the push rod 230 should be attached to the inner wall of the air cavity to push all the air in the air cavity out of the exhaust port 212, if there is no circulation hole 213 between the piston 220 and the air inlet 211/exhaust port 212, the piston 220 needs to overcome the air pressure of the compressed air when moving to the extreme position, the required power is very high, which may cause the power device to run in an overload manner, causing cracks or fractures in the inner wall of the air cavity, and the like; after the circulation holes 213 are arranged, a small part of gas can flow back to the other part of the air cavity through the circulation holes 213, so that the force required to be overcome when the piston 220 moves to the extreme position is effectively reduced, the load of a power device and the damage to the inner wall of the air cavity are reduced, and the service life of the vacuum pump 200 can be prolonged. It is understood that the presence or absence of the flow hole 213 should not be construed as limiting the scope of the present invention, and the vacuum pump 200 of the present invention can perform its function of compressing and discharging gas even without the flow hole 213.

In this embodiment, the vacuum pump 200 further includes an air inlet pipe 291, an air inlet flange 292, an air outlet pipe 293, and an air outlet flange 294, the air inlet flange 292 is connected to the air inlet chamber 240 through the air inlet pipe 291, and gas can enter the air inlet chamber 240 through the air inlet pipe 291; the exhaust flange 294 is connected to the exhaust chamber 250 through an exhaust pipe 293, and gas can enter the exhaust pipe 293 through the exhaust chamber 250; the intake and exhaust flanges 292, 294 facilitate the connection of the vacuum pump 200 to other components.

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. 5 and 14 together, fig. 5 is a cross-sectional view of a check valve 100 according to an embodiment of the present invention in an open state, fig. 6 is a cross-sectional view of the check valve 100 according to the embodiment of the present invention in a closed state, fig. 7 is a structural schematic diagram of a valve cover 10 according to the embodiment of the present invention in a first viewing angle, fig. 8 is a structural schematic diagram of the valve cover 10 shown in fig. 7 in a second viewing angle, fig. 9 is a structural schematic diagram of the valve cover 10 shown in fig. 7 in a third viewing angle, fig. 10 is a cross-sectional view of the valve cover 10 shown in fig. 9, fig. 11 is a structural schematic diagram of a valve seat 20 according to the embodiment of the present invention in the first viewing angle, fig. 12 is a structural schematic diagram of the valve seat 20 shown in fig. 11 in the second viewing angle, fig. 13 is a structural schematic diagram of the valve seat 20 shown in fig..

In an embodiment of the present invention, the check valve 100 includes a valve cover 10, a valve seat 20 and a valve sheet assembly 30, 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 includes a base 21, a positioning guide pillar 22 and a first magnet 24, the positioning guide pillar 22 is convexly disposed on the base 21, the first magnet 24 is connected to the base 21, the valve sheet is disposed in the fluid flow channel 40 and is sleeved with the positioning guide pillar 22, the valve sheet assembly 30 includes a second magnet 31, and the first magnet 24 and the second magnet 31 are arranged in a repelling 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. 15 to 20 together, fig. 15 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. 16 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. 17 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. 18 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. 19 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. 20 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; or,

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 be otherwise variously positioned 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 vacuum pump (200) is characterized by comprising a pump body (210), a piston (220), a push rod (230) and a one-way valve (100), wherein an air cavity is formed in the pump body (210), the piston (220) is contained in the air cavity, and the push rod (230) is connected with the piston (220) and can drive the piston (220) to move in the air cavity; the pump body (210) is further provided with an air inlet (211) and an air outlet (212), and at least two check valves (100) are respectively arranged at the air inlet (211) and the air outlet (212);

the check valve (100) comprises a valve cover (10), a valve seat (20) and a valve plate assembly (24), wherein a first channel (11) is formed in the valve cover (10), a second channel (23) is formed in the valve seat (20), the valve cover (10) covers the valve seat (20) and forms a fluid flow channel (31) 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 to the base (21), the valve plate is arranged in the fluid flow channel (31) and sleeved with the positioning guide pillar (22), the valve plate assembly (24) comprises a second magnet (31), and the first magnet (24) and the second magnet (31) are arranged in a repelling manner;

the valve plate assembly (24) can respond to the change of fluid pressure, so that the one-way valve (100) has a first state that the valve plate assembly (24) 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 (31); and the valve plate assembly (24) 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 vacuum pump (200) of claim 1, wherein the vacuum pump (200) further comprises a first cylinder head (270) and a second cylinder head (280), the first cylinder head (270) and the second cylinder head (280) are respectively disposed at two sides of the pump body (210), the first cylinder head (270) is provided with a water inlet (271), and the second cylinder head (280) is provided with a water outlet (281).

3. The vacuum pump (200) of claim 1, wherein a channel is formed in the first cylinder head (270), and the push rod (230) is inserted into the channel and connected to the piston (220); a sealing element (231) is further arranged in the channel, and the sealing element (231) is located between the first cylinder head (270) and the push rod (230).

4. The vacuum pump (200) of claim 1, wherein the gas inlets (211) are two; and/or the number of the exhaust ports (212) is two.

5. Vacuum pump (200) according to claim 1, characterized in that the first magnet (24) and/or the second magnet (31) is a ring magnet; or,

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

6. The vacuum pump (200) of claim 1, wherein the valve seat (20) further comprises an anti-corrosion layer (50), the anti-corrosion 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).

7. The vacuum pump (200) of claim 6, wherein the erosion resistant layer (50) is a teflon material or a stainless steel material; 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.

8. The vacuum pump (200) of claim 1, wherein the first magnet (24) is embedded in the base (21), or a split structure is adopted between the first magnet (24) and the base (21).

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 (50); 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.