CN223375178U - Check valve and check system - Google Patents

Abstract

The check valve and the check system provided by the utility model have the advantages that the valve core is slidably arranged in the mounting cavity, so that the valve core moves between a blocking position for blocking the outlet of the inflow channel and an opening position for opening the outlet of the inflow channel, when the valve core opens the outlet of the inflow channel, the inflow channel is communicated with the outflow channel through the groove, the elastic piece always applies elastic force for keeping or restoring the valve core to the blocking position to the valve core, and through arranging the grooves which are communicated with the valve core along the circumferential direction of the valve core at intervals on the peripheral side surface of the valve core, when the check valve is opened, fluid can pass through the grooves, the fluid is prevented from passing through the valve core, and therefore, the fluid is less in reversing, so that the flow resistance in a pipeline is reduced, the service life of the check valve is prolonged, and meanwhile, the impact force during the opening and closing of the check valve is buffered, the sealing performance is simultaneously considered, and the reliability of the check valve is further improved.

Description

Check valve and check system

Technical Field

The utility model relates to the technical field of valves, in particular to a check valve and a check system.

Background

A check valve is a valve that allows fluid to flow in a fixed direction and automatically prevents the flow in the opposite direction, also known as a check valve. With the continuous development of the hydrogen energy industry, the hydrogenation station is popularized, and the check valve is used as a common component in a pipeline and is widely applied to the pipeline of the hydrogenation station.

As shown in fig. 1, there is provided a check valve in the prior art, which comprises a valve seat 100', a valve core 200', and an elastic member 300', wherein the valve seat 100' has an inflow channel 101', a valve core cavity 102', and an outflow channel 103' which are communicated in sequence, an outlet end of the inflow channel 101' is provided with a tapered valve port, the valve core 200' is installed in the valve core cavity 102', one end of the valve core 200' facing the inflow channel 101' has a tapered sealing surface 201', the valve core 200' has a valve core flow channel 202' extending from the tapered sealing surface 201' to a direction of the valve core 200' away from the inflow channel 101', and both ends of the elastic member 300' respectively abut against the valve seat 100' and the valve core 200 '. The conical sealing surface 201 'is circumferentially provided with a sealing groove, and an elastic sealing member 203' is arranged in the sealing groove. When no fluid passes through the inflow channel 101', the conical sealing surface 201' of the valve core 200' is contacted with the valve port in a matched manner under the action of the elasticity of the elastic piece 300', the elastic sealing piece 203' has a sealing effect, and when the fluid pressure of the inflow channel 101' overcomes the elastic force of the elastic piece 300', the fluid pushes the valve core 200' to move along the direction away from the inflow channel 101', and the valve port is opened.

However, in the prior art, the valve core 200' and the valve seat 100' are both made of metal materials, so that the impact sound is relatively large when the check valve is opened and closed, and the elastic sealing member 203' is repeatedly rubbed by the valve core 200' and the valve seat 100' when the check valve is repeatedly opened and closed, so that the check valve is extremely easy to damage, and the consequences of collision damage and sealing failure of the check valve are easily caused. In addition, when fluid flows from the inflow channel 101' to the valve core 200', the fluid needs to enter the valve core 200' from the inlet of the valve core channel 202' on the conical sealing surface 201' of the valve core 200', and then flows out from the other end of the valve core 200', and the valve core channel 202' has corners, so that the processing difficulty of the valve core channel 202' is high, and meanwhile, the whole flow resistance of the check valve is high due to more change of the fluid flowing direction, so that the service life of the check valve is shortened. Therefore, there is a need to provide a check valve to solve the above problems.

Disclosure of utility model

The utility model aims to provide a check valve, so as to solve the technical problems of easy damage of the check valve and large flow resistance of a pipeline in the prior art and prolong the service life of the check valve.

Another object of the present utility model is to provide a check system, so as to solve the technical problems of easy damage of check valve and large flow resistance of pipeline in the prior art, and improve the service life of the check system.

The technical scheme adopted by the utility model is as follows:

The check valve comprises a valve body assembly, a valve core and a valve core, wherein the valve body assembly is provided with an inflow channel, an installation inner cavity and an outflow channel which are sequentially communicated, the valve core is a nonmetallic elastomer, a plurality of grooves are formed in the peripheral side surface of the valve core at intervals along the circumferential direction, and the grooves axially penetrate through the valve core along the valve core;

The valve core is slidably mounted in the mounting cavity, so that the valve core moves between a blocking position for blocking the outlet of the inflow channel and an opening position for opening the outlet of the inflow channel, and when the valve core opens the outlet of the inflow channel, the inflow channel is communicated with the outflow channel through the groove;

An elastic piece is arranged in the installation cavity and always applies elastic force to the valve core to enable the valve core to keep or return to the blocking position.

Optionally, the groove is far away from the bottom of one end of the inflow channel to form a diversion surface, and the diversion surface extends obliquely towards the axis of the valve core along the direction far away from the inflow channel;

one end of the installation cavity, which is far away from the inflow channel, forms a conical cavity part, and the small end of the conical cavity part faces the outflow channel;

When the valve core is positioned at the opening position, the flow guide surface is opposite to the hole wall of the conical cavity part and is arranged at intervals to form a converging gap.

Optionally, the width of the converging slit is greater than or equal to the depth of the groove.

Optionally, the outlet of the inflow channel flares along the direction towards the installation cavity to form a conical valve port, one end of the valve core away from the outflow channel is provided with a conical surface, the conical valve port is attached to the conical surface when the valve core is in the blocking position, and the cone angle of the conical valve port is larger than or equal to that of the conical surface.

Optionally, the cross section of the groove is round, rectangular, trapezoidal or triangular, and/or the number of the grooves is 2-8.

Optionally, the valve body assembly includes valve seat and the connecting seat of detachable connection, the valve seat has the inflow passageway, the connecting seat has the pedestal installation chamber of intercommunication in proper order the installation inner chamber with the outflow passageway, the valve seat seal install in the pedestal installation chamber.

Optionally, the valve seat is close to the one end edge of case is provided with first sealed conical surface, the pedestal installation chamber is close to one side chamber wall of installation inner chamber has the second sealed conical surface, the tip of first sealed conical surface is towards the installation inner chamber, first sealed conical surface with the cooperation of second sealed conical surface is in order to realize the valve seat with the seal of connecting seat.

Optionally, the taper angle of the first sealing taper surface is smaller than the taper angle of the second sealing taper surface, and the taper angle difference between the first sealing taper surface and the second sealing taper surface is 0.5 ° -2 °.

Optionally, the one end of pedestal installation cavity orientation installation cavity has first chamber portion and second chamber portion, first chamber portion coaxial communication in between the second chamber portion with install the inner chamber, just the aperture of first chamber portion is less than the aperture of second chamber portion, the second sealed conical surface connect in between the week side chamber wall of first chamber portion with the chamber bottom of second chamber portion.

A check system comprising the check valve.

The utility model has the beneficial effects that:

according to the check valve, the grooves which are communicated with the check valve body along the circumferential direction are formed in the peripheral side surface of the valve core at intervals, when the check valve is opened, fluid can pass through the grooves, the fluid is prevented from passing through the valve core, so that the fluid is less in reversing, the flow resistance in a pipeline is reduced, the service life of the check valve is prolonged, meanwhile, the grooves are formed in the peripheral surface of the valve core and axially penetrate through the valve core, the structure of the grooves can be effectively simplified, the processing difficulty of the grooves is reduced, and furthermore, the impact force of the check valve when the check valve is opened and closed is buffered due to the fact that the valve core is made of a nonmetallic elastomer, the sealing performance is simultaneously considered, and the reliability of the check valve is further improved.

According to the check system provided by the utility model, by adopting the check valve, the cost of the check system can be reduced, the flow resistance of a pipeline of the check system is reduced, and the use reliability and the service life of the check system are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the drawings needed in the description of the embodiments of the present utility model, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the contents of the embodiments of the present utility model and these drawings without inventive effort for those skilled in the art.

FIG. 1 is a cross-sectional view of a prior art check valve;

FIG. 2 is a cross-sectional view of a check valve provided in an embodiment of the present utility model with a valve spool in a blocking position;

FIG. 3 is a cross-sectional view of a check valve provided in an embodiment of the present utility model with the valve spool in an open position;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic structural view of a valve element according to an embodiment of the present utility model;

fig. 6 is another schematic structural view of a valve core according to an embodiment of the present utility model.

In the figure:

100', valve seat, 101', inflow channel, 102', spool chamber, 103', outflow channel, 200', spool, 201', conical sealing surface, 202', spool flow channel, 203', elastic seal, 300', elastic member;

1. Valve body assembly, 11, valve seat, 111, inflow channel, 112, valve sleeve, 113, air tap, 1131, conical valve port, 1132, first sealing conical surface, 12, connecting seat, 121, installation cavity, 1211, cylindrical cavity, 1212, converging cavity, 1213, conical cavity, 122, outflow channel, 123, converging gap, 124, second sealing conical surface, 125, seat installation cavity, 1251, first cavity, 1252, second cavity, 1253, third cavity;

2. A valve core; 21, grooves, 22, diversion surfaces, 23, accommodating grooves, 24 and conical surfaces;

3. An elastic member.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. In the description of the present embodiment, unless specifically stated otherwise, "a plurality of" means two or more.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

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

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

The check valve is used for solving the technical problems that the check valve is easy to damage and the flow resistance of a pipeline is large, and prolonging the service life of the check valve.

As shown in fig. 2 to 3, the check valve comprises a valve body assembly 1, the valve body assembly 1 comprises a valve seat 11 and a connecting seat 12 which are detachably connected, the valve seat 11 is provided with an inflow channel 111, the connecting seat 12 is provided with a seat body installation cavity 125, an installation inner cavity 121 and an outflow channel 122 which are communicated in sequence, and the valve seat 11 is hermetically installed in the seat body installation cavity 125. Through the above arrangement, the inflow channel 111 of the valve seat 11 is sequentially communicated with the installation cavity 121 and the outflow channel 122 of the connecting seat 12, that is, the valve body assembly 1 is provided with the inflow channel 111, the installation cavity 121 and the outflow channel 122 which are sequentially communicated, so that a fluid channel structure with two sides of a cavity in the middle part for fluid to pass through is formed.

The check valve further includes a valve body 2, and the valve body 2 is slidably mounted in the mounting cavity 121 so that the valve body 2 moves between a blocking position blocking the outlet of the inflow channel 111 and an open position opening the outlet of the inflow channel 111. The peripheral side surface of the valve core 2 is provided with a plurality of grooves 21, the grooves 21 are arranged at intervals along the circumferential direction of the valve core 2, the grooves 21 penetrate through the valve core 2 along the axial direction of the valve core 2, and when the valve core 2 opens the outlet of the inflow channel 111, the inflow channel 111 is communicated with the outflow channel 122 through the grooves 21.

It will be appreciated that when the valve element 2 blocks the outlet of the inflow channel 111, fluid cannot enter the inflow channel 111 through the outflow channel 122 and the installation cavity 121, and the check valve is in a blocking state for blocking the reverse flow of fluid, when the valve element 2 does not block the outlet of the inflow channel 111, fluid can enter the installation cavity 121 from the inflow channel 111, then pass through the groove 21 on the valve element 2, finally reach the outflow channel 122, and the check valve is in a conducting state for conducting fluid.

An elastic member 3 is further disposed in the installation cavity 121, and the elastic member 3 always applies an elastic force to the valve element 2 to maintain or restore the valve element 2 to the blocking position. It can be understood that the elastic member 3 pushes the valve core 2 against the outlet of the inflow channel 111 with its own elastic force, so that the check valve is in a closed state, but when the pressure of the fluid flowing into the inflow channel 111 reaches a certain level, the fluid can push the valve core 2 to move against the elastic force of the elastic member 3, at this time, the outlet of the inflow channel 111 is opened, the fluid can flow through the inflow channel 111, the installation cavity 121, the groove 21 and the outflow channel 122 in sequence, so that the check valve is in a closed state, and when the pressure of the fluid flowing into the inflow channel 111 is reduced to a certain level, the elastic force generated by the elastic member 3 overcomes, counteracts the pressure difference between the inflow channel 111 and the outflow channel 122, the valve core 2 returns to the blocking position to block the outlet of the inflow channel 111 again, so that the check valve is in a closed state again.

In order to improve the installation convenience of the elastic element 3, the middle part of one end of the valve core 2, which is close to the outflow channel 122, is provided with a containing groove 23, the first end of the elastic element 3 is abutted with the bottom of the containing groove 23, and the second end is abutted with a side cavity wall of the installation cavity 121, which is close to the outflow channel 122. This setting makes elastic component 3 and case 2 firm being connected, promotes structural rationality, and the elastic force that elastic component 3 applyed simultaneously acts on case 2 one end middle part, has strengthened the stability of application of force, and then has increased the start and stop smoothness degree of check valve.

Alternatively, the elastic member 3 is preferably a compression spring. The compression spring has strong elastic force and long service life, and can improve the reliability of the check valve.

Because the grooves 21 are arranged on the peripheral side surface of the valve core 2 at intervals, when the valve core 2 is in the open position, fluid passes along the circumferential direction of the valve core 2, the uniformity is good, the grooves 21 are communicated with the valve core 2, frequent reversing is not needed when the fluid passes, the flow resistance is small, the pipeline pressure is reduced, and the stability of the check valve is improved. Meanwhile, the groove 21 is formed in the outer peripheral surface of the valve core 2 and penetrates through the valve core 2 along the axial direction, the groove 21 does not need to be machined in the valve core 2, the structure of the groove 21 is effectively simplified, and the machining difficulty of the groove 21 is reduced.

Alternatively, the cross-sectional shape of the grooves 21 is circular, rectangular, trapezoidal, or triangular, and the number of the grooves 21 is 2 to 8. The shape setting can ensure that fluid smoothly passes through the groove 21, reduce the flow resistance of the pipeline, and the setting quantity can ensure enough fluid flow and avoid the structural strength of the valve core 2 from being influenced by excessive grooves 21.

In other embodiments, other shapes and numbers of grooves 21 may be provided, so long as fluid smoothness and better structural strength are ensured, without undue limitation.

It should be noted that, the material of the valve core 2 is a non-metal elastomer, and the check valve often needs to be frequently switched between the open position and the blocking position in the actual working process, so that the valve core 2 continuously impacts the outlet of the inflow channel 111 to cause larger noise and the valve core 2 is easy to be damaged, and the non-metal elastomer can better buffer the impact force, thereby reducing the noise and prolonging the service life of the check valve. In addition, the valve core 2 of the nonmetallic elastomer can generate certain deformation when the outlet of the inflow channel 111 is plugged, so that the plugging effect of the outlet of the inflow channel 111 is enhanced, and the air tightness of the check valve is improved.

The valve core 2 is preferably made of polytetrafluoroethylene material, and the polytetrafluoroethylene material has high corrosion resistance, high lubrication non-viscosity and high mechanical toughness, so that the sealing and buffering effects of the valve core 2 can be improved, and the service life of the valve core is prolonged. Of course, the valve core 2 may be made of other non-metal elastic materials, so long as the impact force between the buffer valve core 2 and the valve body assembly 1 can be met and a certain deformation can be generated, so that the sealing is enhanced, and no excessive limitation is made.

To enhance the blocking effect of the valve core 2 on the inflow channel 111, the outlet of the inflow channel 111 is flared toward the direction of the installation cavity 121 to form a tapered valve port 1131, and one end of the valve core 2 away from the outflow channel 122 is provided with a tapered surface 24, and the tapered valve port 1131 is attached to the tapered surface 24. This arrangement promotes the degree of adaptation of the valve element 2 to the outlet of the inflow passage 111, thereby improving the reliability in blocking and enhancing the air tightness of the check valve.

Specifically, the taper angle of tapered valve port 1131 is greater than or equal to the taper angle of tapered surface 24. When the cone angle of the conical surface 24 is equal to that of the conical valve port 1131, the two are matched, so that the rationality and the consistency of the structure are improved, and when the cone angle of the conical valve port 1131 is larger than that of the conical surface 24, the cone angle difference between the conical valve port 1131 and the conical valve port is 0.5-2 degrees, preferably 1-1.5 degrees, and the valve core 2 is deformed due to the cone angle difference after the conical valve port 1131 is abutted, so that the sealing effect between the conical surface 24 and the conical valve port 1131 is improved, and the overall air tightness of the check valve is further improved.

As shown in fig. 3 and 6, alternatively, the groove 21 forms a guide surface 22 away from the bottom of one end of the inflow channel 111, the guide surface 22 extends obliquely toward the axis of the valve element 2 in a direction away from the inflow channel 111, the mounting inner cavity 121 forms a tapered cavity portion 1213 at one end away from the inflow channel 111, the small end of the tapered hole faces the outflow channel 122, and when the valve element 2 is in the open position, the guide surface 22 is opposite to and spaced from the wall of the tapered cavity portion 1213 to form a converging gap 123. Since the fluid is converged into the outflow channel 122 after flowing out of the groove 21, if the fluid directly flows out along the axial direction of the valve core 2, the fluid will impact the wall of the installation cavity 121, thereby increasing the resistance of the pipeline, and in this embodiment, by providing the cooperation of the diversion surface 22 and the tapered cavity 1213, when the fluid flows out of the groove 21, the fluid is guided to flow towards the center direction of the installation cavity 121 under the guiding effect of the inclined converging gap 123, so that the impact of the fluid on the cavity wall of the installation cavity 121 is relieved, the flow path is smoother, and the pipeline resistance is reduced.

Illustratively, the width of the converging slot 123 is greater than or equal to the depth of the recess 21. This arrangement allows the flow range of the fluid to remain unchanged or expand as it exits the recess 21, avoiding resistance to the fluid and thus reducing the resistance of the tubing.

The installation cavity 121 includes a cylindrical cavity portion 1211 coaxially communicating with the tapered cavity portion 1213, the cylindrical cavity portion 1211 being located between the housing installation cavity 125 and the tapered cavity portion 1213, the diameter of the cylindrical cavity portion 1211 being equal to the large end diameter of the tapered cavity portion 1213, the spool 2 being installed in the cylindrical cavity portion 1211, the installation cavity 121 further including a converging cavity portion 1212, the converging cavity portion 1212 being coaxially communicating between the tapered cavity portion 1213 and the outflow passage 122. When the spool 2 is in the open position, the fluid flowing out of the groove 21 flows into the confluence chamber portion 1212 by the drainage of the confluence slit 123, and flows to the outflow passage 122 through the confluence chamber portion 1212.

As shown in fig. 3 and 4, in order to improve the tightness of the valve seat 11 and the connecting seat 12 of the check valve, a first sealing conical surface 1132 is provided at an edge of one end of the valve seat 11, which is close to the valve core 2, and a second sealing conical surface 124 is provided at a side wall of the seat body mounting cavity 125, which is close to the mounting cavity 121, a small end of the first sealing conical surface 1132 faces the mounting cavity 121, and the first sealing conical surface 1132 cooperates with the second sealing conical surface 124 to seal the valve seat 11 and the connecting seat 12. The valve seat 11 and the connecting seat 12 are sealed by conical surfaces, so that the adaptation degree of the valve seat 11 and the connecting seat can be improved, the assembly efficiency can be improved, and the structural rationality can be improved.

Further, the taper angle of the first sealing taper surface 1132 is smaller than that of the second sealing taper surface 124, and the first sealing taper surface 1132 is gentler than the second sealing taper surface 124, so that a hard sealing surface is formed at the abutting position after the first sealing taper surface 1132 and the second sealing taper surface 124 are abutted, and the air tightness of the check valve is improved. Optionally, the taper angle difference between the first sealing taper 1132 and the second sealing taper 124 is 0.5 ° -2 °, preferably 1 ° -1.5 °. The cone angle difference value can ensure the formation of a hard sealing surface and avoid the phenomenon of stress concentration caused by over sharp abutting parts from influencing the service life of the check valve.

In this embodiment, the outer periphery of the valve seat 11 is provided with external threads, and the inner cavity wall of the seat body mounting cavity 125 is provided with internal threads, and the external threads are matched with the internal threads. As can be appreciated, as the valve seat 11 is continuously screwed into the inner cavity wall of the seat body mounting cavity 125, the first sealing tapered surface 1132 and the second sealing tapered surface 124 gradually abut against each other until a hard sealing surface is formed, so as to achieve a sealed connection between the valve seat 11 and the connection seat 12.

Optionally, an end of the seat body mounting cavity 125 facing the mounting cavity 121 has a first cavity portion 1251 and a second cavity portion 1252, the first cavity portion 1251 is coaxially communicated between the second cavity portion 1252 and the mounting cavity 121, the aperture of the first cavity portion 1251 is smaller than that of the second cavity portion 1252, and the second sealing cone 124 is connected between a peripheral side cavity wall of the first cavity portion 1251 and a cavity bottom of the second cavity portion 1252. This arrangement allows the first and second chamber portions 1251 and 1252 to be stepped, and the second sealing cone 124 is located on the step, thereby improving the pressure-bearing capacity of the second sealing cone 124, and making the abutment between the first and second sealing cones 1132 and 124 more tight, thereby improving the air tightness of the check valve.

The housing mounting chamber 125 further includes a third chamber portion 1253, the second chamber portion 1252 being coaxially connected between the first chamber portion 1251 and the third chamber portion 1253, the third chamber portion 1253 having a larger aperture than the second chamber portion 1252. The valve seat 11 comprises a valve sleeve 112 and an air tap 113, wherein the valve sleeve 112 is sleeved on the periphery of one end of the air tap 113, an external thread is arranged on the peripheral wall of the valve sleeve 112, an internal thread is arranged on the inner wall of the third cavity 1253, and the valve sleeve 112 is screwed on the third cavity 1253. The air tap 113 is provided with an inflow channel 111 and the end of the other end extends out of the end of the valve sleeve 112 towards the mounting cavity 121, and the edge of the end of the other end of the air tap 113 is provided with a first sealing conical surface 1132. As valve sleeve 112 is threaded into third chamber portion 1253, valve sleeve 112 pushes against air cap 113 to move, causing first sealing cone 1132 to gradually abut second sealing cone 124 until a hard sealing surface is formed. The valve seat 11 is formed by the valve sleeve 112 and the air tap 113, so that the sealing of the valve seat 11 and the connecting seat 12 of the check valve can be realized, and the sealing effect can be prevented from being influenced by the relative rotation of the first sealing conical surface 1132 and the conical surface 124 in the process of screwing the valve sleeve 112 into the third cavity 1253.

Alternatively, the valve seat 11 and the connection seat 12 are made of 316 stainless steel or 316L stainless steel material. The material is selected, so that the valve seat 11 and the connecting seat 12 have better corrosion resistance and high pressure resistance, and the service life of the check valve is prolonged. Of course, in other embodiments, other materials may be used, as long as the better corrosion resistance and high pressure resistance are ensured, without being limited thereto.

The check valve of this embodiment is assembled as follows:

Firstly, the elastic piece 3 is arranged in the containing groove 23 at the center of one end of the valve core 2, then the elastic piece 3 and the valve core 2 are put into the installation cavity 121 of the connecting seat 12 together, the elastic piece 3 is abutted against one side cavity wall of the installation cavity 121, which is close to the outflow channel 122, at the moment, the valve seat 11 is screwed into the seat body installation cavity 125 to carry out certain screwing moment until the first sealing conical surface 1132 and the second sealing conical surface 124 are abutted, and the assembly of the check valve is completed.

The embodiment also provides a check system, which is used for reducing the flow resistance of a pipeline of the check system, and improving the use reliability and the service life of the check system.

The check system includes an external pipe, and further includes a check valve, and the inflow passage 111 and the outflow passage 122 are connected with the external pipe. The check valve is adopted by the check system to realize one-way conduction between the external pipelines, so that the cost of the check system is reduced, the flow resistance of the pipelines of the check system is reduced, and the use reliability and the service life of the check system are further improved.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. The check valve comprises a valve body assembly (1), wherein the valve body assembly (1) is provided with an inflow channel (111), an installation inner cavity (121) and an outflow channel (122) which are sequentially communicated, and the check valve is characterized by further comprising a valve core (2), wherein the valve core (2) is a nonmetallic elastomer, a plurality of grooves (21) are formed in the circumferential side surface of the valve core (2) at intervals along the circumferential direction, and the grooves (21) axially penetrate through the valve core (2) along the valve core (2);

The valve core (2) is slidably mounted in the mounting cavity (121) so that the valve core (2) moves between a blocking position for blocking the outlet of the inflow channel (111) and an opening position for opening the outlet of the inflow channel (111), and when the valve core (2) opens the outlet of the inflow channel (111), the inflow channel (111) is communicated with the outflow channel (122) through the groove (21);

An elastic piece (3) is arranged in the installation cavity (121), and the elastic piece (3) always applies elastic force to the valve core (2) to enable the valve core (2) to keep or return to the blocking position.

2. The non-return valve according to claim 1, characterized in that the groove (21) forms a flow guiding surface (22) at the bottom of one end of the groove remote from the inflow channel (111), the flow guiding surface (22) extending obliquely to the axis of the valve core (2) in a direction remote from the inflow channel (111);

One end of the installation cavity (121) far away from the inflow channel (111) forms a conical cavity part (1213), and the small end of the conical cavity part (1213) faces the outflow channel (122);

When the valve core (2) is positioned at the opening position, the flow guide surface (22) is opposite to the hole wall of the conical cavity part (1213) and is arranged at intervals to form a converging gap (123).

3. The check valve according to claim 2, characterized in that the width of the converging slit (123) is greater than or equal to the depth of the groove (21).

4. The check valve according to claim 1, characterized in that the outlet of the inflow channel (111) flares in a direction towards the mounting cavity (121) to form a conical valve port (1131), the end of the valve core (2) away from the outflow channel (122) is provided with a conical surface (24), and in the blocking position of the valve core (2), the wall of the conical valve port (1131) is attached to the conical surface (24), and the cone angle of the conical valve port (1131) is larger than or equal to the cone angle of the conical surface (24).

5. A check valve according to claim 1, characterized in that the cross-sectional shape of the groove (21) is circular, rectangular, trapezoidal or triangular, and/or the number of grooves (21) is 2-8.

6. A check valve according to any one of claims 1-5, wherein the valve body assembly (1) comprises a valve seat (11) and a connecting seat (12) which are detachably connected, the valve seat (11) having the inflow channel (111), the connecting seat (12) having a seat body mounting cavity (125), the mounting cavity (121) and the outflow channel (122) which are in communication in this order, the valve seat (11) being sealingly mounted to the seat body mounting cavity (125).

7. The check valve according to claim 6, wherein a first sealing conical surface (1132) is provided on the valve seat (11) near an end edge of the valve core (2), a second sealing conical surface (124) is provided on a side wall of the seat body mounting cavity (125) near the mounting cavity (121), a small end of the first sealing conical surface (1132) faces the mounting cavity (121), and the first sealing conical surface (1132) cooperates with the second sealing conical surface (124) to seal the valve seat (11) and the connecting seat (12).

8. The check valve of claim 7, wherein the taper angle of the first sealing taper (1132) is less than the taper angle of the second sealing taper (124), the taper angle difference between the first sealing taper (1132) and the second sealing taper (124) being 0.5 ° -2 °.

9. The check valve of claim 7, wherein an end of the seat mounting cavity (125) facing the mounting cavity (121) has a first cavity portion (1251) and a second cavity portion (1252), the first cavity portion (1251) is coaxially communicated between the second cavity portion (1252) and the mounting cavity (121), and an aperture of the first cavity portion (1251) is smaller than an aperture of the second cavity portion (1252), and the second sealing tapered surface (124) is connected between a peripheral side cavity wall of the first cavity portion (1251) and a cavity bottom of the second cavity portion (1252).

10. A non-return system comprising an external connection, characterized in that the non-return system further comprises a non-return valve according to any one of claims 1-9, the external connection being connected to both the inflow channel (111) and the outflow channel (122).