Check valve and check system

Abstract

According to the check valve and the check system, the valve element is installed in the installation inner cavity in the sliding mode so that the valve element can move between the blocking position for blocking the outlet of the inflow channel and the opening position for opening the outlet of the inflow channel, and when the valve element 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 to the valve element to enable the valve element to keep or return to the plugging position, the grooves penetrating through the valve element in the circumferential direction of the valve element are formed in the circumferential side surface of the valve element at intervals, fluid can pass through the grooves when the check valve is opened, the fluid is prevented from passing through the interior of the valve element, and therefore the fluid reversing amount is small, and the valve element is not prone to falling off. Therefore, the flow resistance in a pipeline is reduced, and the service life of the check valve is prolonged; meanwhile, due to the fact that the valve element is made of the non-metal elastic body, impact force generated when the check valve is opened and closed is buffered, sealing performance is considered at the same time, and reliability of the check valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a check valve and a check system. Background Art

[0002] A check valve, also known as a non-return valve, allows fluid to flow in a fixed direction while automatically preventing it from flowing in the opposite direction. With the continuous development of the hydrogen energy industry, hydrogen refueling stations have become increasingly popular. As a common component in pipelines, check valves are widely used in hydrogen refueling station pipelines.

[0003] like Figure 1 As shown, a check valve is provided in the prior art, comprising a valve seat 100', a valve core 200', and an elastic member 300'. The valve seat 100' has an inflow channel 101', a valve core cavity 102', and an outflow channel 103', which are sequentially connected. The 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', and the 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' toward the valve core 200', away from the inflow channel 101'. The ends of the elastic member 300' respectively abut against the valve seat 100' and the valve core 200'. A sealing groove is circumferentially defined on the tapered sealing surface 201', and an elastic sealing member 203' is disposed within the sealing groove. When no fluid flows through the inflow channel 101', the conical sealing surface 201' of the valve core 200' contacts the valve port under the elastic force of the elastic member 300', and the elastic sealing member 203' performs a sealing effect; when the fluid pressure flowing into the inflow channel 101' overcomes the elastic force of the elastic member 300', the fluid pushes the valve core 200' in a direction away from the inflow channel 101', and the valve port is opened.

[0004] However, in the prior art, the check valve, the valve core 200' and the valve seat 100' are both made of metal, and the check valve makes a loud impact sound when opening and closing. Moreover, when repeatedly opened and closed, the elastic seal 203' is repeatedly rubbed by the valve core 200' and the valve seat 100', which is very easy to be damaged, and thus easily leads to the consequences of the check valve being damaged and the seal failing. In addition, when the fluid flows from the inlet channel 101' to the valve core 200', it needs to enter the interior of the valve core 200' from the entrance of the valve core channel 202' on the conical sealing surface 201' of the valve core 200', and then flow out from the other end of the valve core 200'. Since the valve core channel 202' has a corner, the valve core channel 202' is difficult to process. At the same time, due to the frequent changes in the direction of fluid flow, the overall flow resistance of the check valve is large, thereby shortening the service life of the check valve. Therefore, it is urgent to propose a check valve to solve the above problems. Utility Model Content

[0005] One purpose of the utility model is to provide a check valve to solve the technical problems in the prior art that the check valve is easily damaged and the pipeline flow resistance is large, thereby increasing the service life of the check valve.

[0006] Another object of the present invention is to provide a check system to solve the technical problems in the prior art of easy damage of the check valve and large flow resistance in the pipeline, thereby increasing the service life of the check system.

[0007] As conceived above, the technical solution adopted by the present utility model is:

[0008] The check valve includes a valve body assembly having an inflow channel, a mounting inner cavity, and an outflow channel that are sequentially connected. The check valve also includes a valve core, which is a non-metallic elastic body. A plurality of grooves are formed on the circumferential side surface of the valve core at intervals along the circumferential direction. The grooves extend through the valve core along the axial direction of the valve core.

[0009] The valve core is slidably mounted in the mounting inner 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;

[0010] An elastic member is provided in the installation inner cavity, and the elastic member always applies an elastic force to the valve core to make the valve core maintain or return to the blocking position.

[0011] Optionally, a guide surface is formed at the bottom of one end of the groove away from the inflow channel, and the guide surface extends obliquely toward the axis of the valve core in a direction away from the inflow channel;

[0012] The installation inner cavity forms a tapered cavity at one end away from the inflow channel, and the small end of the tapered cavity faces the outflow channel;

[0013] When the valve core is located at the open position, the guide surface is opposite to the hole wall of the tapered cavity portion and is spaced apart to form a converging gap.

[0014] Optionally, the width of the confluence gap is greater than or equal to the depth of the groove.

[0015] Optionally, the outlet of the inflow channel is expanded in a direction toward the installation inner cavity to form a conical valve port, and a conical surface is provided at one end of the valve core away from the outflow channel. When the valve core is in the blocking position, the conical valve port and the conical surface are in contact with each other, and the conical angle of the conical valve port is greater than or equal to the conical angle of the conical surface.

[0016] Optionally, the cross-sectional shape of the groove is circular, rectangular, trapezoidal or triangular, and / or the number of the grooves is 2-8.

[0017] Optionally, the valve body assembly includes a detachably connected valve seat and a connecting seat, the valve seat having the inflow channel, the connecting seat having a seat body mounting cavity, the mounting inner cavity and the outflow channel connected in sequence, and the valve seat is sealed and installed in the seat body mounting cavity.

[0018] Optionally, a first sealing conical surface is provided on the edge of one end of the valve seat close to the valve core, and a second sealing conical surface is provided on the side wall of the seat body mounting cavity close to the mounting inner cavity, and the small end of the first sealing conical surface faces the mounting inner cavity, and the first sealing conical surface cooperates with the second sealing conical surface to achieve sealing between the valve seat and the connecting seat.

[0019] Optionally, the cone angle of the first sealing cone surface is smaller than the cone angle of the second sealing cone surface, and the difference between the cone angles of the first sealing cone surface and the second sealing cone surface is 0.5°-2°.

[0020] Optionally, the seat body mounting cavity has a first cavity portion and a second cavity portion at one end facing the mounting inner cavity, the first cavity portion is coaxially connected between the second cavity portion and the mounting inner cavity, and the aperture of the first cavity portion is smaller than the aperture of the second cavity portion, and the second sealing cone surface is connected between the circumferential cavity wall of the first cavity portion and the cavity bottom of the second cavity portion.

[0021] A check system comprises the check valve.

[0022] Beneficial effects of the utility model:

[0023] The utility model proposes a check valve, which has grooves arranged at intervals on the circumferential side surface of the valve core and extending through the valve core itself in the circumferential direction. When the check valve is opened, the fluid can pass through the grooves, avoiding the fluid passing through the inside of the valve core. Therefore, there is less fluid reversal, thereby reducing the flow resistance in the pipeline and extending the service life of the check valve. At the same time, the grooves are provided on the outer circumferential surface of the valve core and extend through the valve core in the axial direction, which can effectively simplify the structure of the grooves and reduce the difficulty of processing the grooves. Furthermore, since the material of the valve core is a non-metallic elastomer, the impact force when the check valve is opened and closed is buffered, while taking into account the sealing performance, thereby improving the reliability of the check valve.

[0024] The check system provided by the utility model can reduce the cost of the check system, reduce the flow resistance of the pipeline of the check system, and improve the reliability and service life of the check system by adopting the above-mentioned check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 It is a cross-sectional view of a check valve in the prior art;

[0027] Figure 2 This is a cross-sectional view of the check valve provided by an embodiment of the present utility model when the valve core is in a blocking position;

[0028] Figure 3 This is a cross-sectional view of the check valve provided by an embodiment of the present utility model when the valve core is in an open position;

[0029] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0030] Figure 5 This is a schematic structural diagram of the valve core provided by an embodiment of the present utility model;

[0031] Figure 6 This is another structural schematic diagram of the valve core provided in an embodiment of the utility model.

[0032] In the picture:

[0033] 100', valve seat; 101', inflow channel; 102', valve core cavity; 103', outflow channel; 200', valve core; 201', conical sealing surface; 202', valve core flow channel; 203', elastic sealing member; 300', elastic member;

[0034] 1. Valve body assembly; 11. Valve seat; 111. Inflow channel; 112. Valve sleeve; 113. Air nozzle; 1131. Conical valve port; 1132. First sealing cone; 12. Connecting seat; 121. Mounting cavity; 1211. Cylindrical cavity; 1212. Converging cavity; 1213. Conical cavity; 122. Outflow channel; 123. Converging gap; 124. Second sealing cone; 125. Seat mounting cavity; 1251. First cavity; 1252. Second cavity; 1253. Third cavity

[0035] 2. Valve core; 21. Groove; 22. Guide surface; 23. Accommodation groove; 24. Conical surface;

[0036] 3. Elastic parts. DETAILED DESCRIPTION

[0037] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of it.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0039] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] In the present utility model, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0041] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0042] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or there may be an element located in the middle.

[0043] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0044] The check valve provided in this embodiment is used to solve the technical problems of easy damage of the check valve and large flow resistance in the pipeline, thereby increasing the service life of the check valve.

[0045] like Figure 2-Figure 3 As shown, the check valve includes a valve body assembly 1, which includes a detachably connected valve seat 11 and a connecting seat 12. The valve seat 11 has an inflow channel 111, and the connecting seat 12 has a seat body mounting cavity 125, a mounting inner cavity 121, and an outflow channel 122 that are sequentially connected. The valve seat 11 is sealingly mounted in the seat body mounting cavity 125. Through the above arrangement, the inflow channel 111 of the valve seat 11 is sequentially connected to the mounting inner cavity 121 and the outflow channel 122 of the connecting seat 12. That is, the valve body assembly 1 has the inflow channel 111, the mounting inner cavity 121, and the outflow channel 122 that are sequentially connected, forming a structure with a cavity in the middle and fluid channels connected on both sides for fluid to pass through.

[0046] The check valve also includes a valve core 2, which is slidably mounted within the mounting cavity 121, allowing the valve core 2 to move between a blocked position, which blocks the outlet of the inflow channel 111, and an open position, which opens the outlet of the inflow channel 111. A plurality of grooves 21 are defined on the circumferential surface of the valve core 2. The grooves 21 are spaced apart along the circumference of the valve core 2 and extend axially through the valve core 2. When the valve core 2 opens the outlet of the inflow channel 111, the inflow channel 111 communicates with the outflow channel 122 through the grooves 21.

[0047] It can be understood that when the valve core 2 blocks the outlet of the inflow channel 111, the fluid cannot enter the inflow channel 111 through the outflow channel 122 and the installation inner cavity 121, and the check valve is in a cut-off state that cuts off the reverse flow of the fluid; when the valve core 2 does not block the outlet of the inflow channel 111, the fluid can enter the installation inner cavity 121 from the inflow channel 111, and then pass through the groove 21 on the valve core 2, and finally reach the outflow channel 122. At this time, the check valve is in a conduction state that conducts the fluid.

[0048] An elastic member 3 is also disposed within the mounting cavity 121. The elastic member 3 constantly applies an elastic force to the valve core 2, causing the valve core 2 to maintain or return to the blocked position. It is understood that the elastic member 3 uses its own elastic force to press the valve core 2 against the outlet of the inflow channel 111, placing the check valve in a blocked state. However, when the pressure of the fluid entering the inflow channel 111 reaches a certain level, the fluid can push the valve core 2, causing it to overcome the elastic force of the elastic member 3 and move. At this point, the outlet of the inflow channel 111 is opened, and the fluid can flow sequentially through the inflow channel 111, the mounting cavity 121, the groove 21, and the outflow channel 122, thereby placing the check valve in a conductive state. Furthermore, when the pressure of the fluid entering the inflow channel 111 decreases to a certain level, the elastic force generated by the elastic member 3 overcomes and offsets the pressure difference between the inflow channel 111 and the outflow channel 122, causing the valve core 2 to return to the blocked position and re-block the outlet of the inflow channel 111, and the check valve is once again in a blocked state.

[0049] To facilitate installation of the elastic member 3, a receiving groove 23 is defined in the middle of one end of the valve core 2, near the outflow passage 122. The first end of the elastic member 3 abuts the bottom of the receiving groove 23, while the second end abuts the wall of the mounting cavity 121, near the outflow passage 122. This arrangement ensures a secure connection between the elastic member 3 and the valve core 2, enhancing structural rationality. Furthermore, the elastic force exerted by the elastic member 3 acts on the middle of one end of the valve core 2, enhancing the stability of the force applied and, in turn, improving the smoothness of the opening and closing of the check valve.

[0050] Optionally, the elastic member 3 is preferably a compression spring. The compression spring has strong elastic force and long service life, which can improve the reliability of the check valve.

[0051] Because the grooves 21 are arranged at intervals on the circumferential surface of the valve core 2, when the valve core 2 is in the open position, the fluid flows along the circumference of the valve core 2 with good uniformity. Moreover, the grooves 21 extend through the valve core 2, eliminating the need for frequent reversal of direction during fluid flow and reducing flow resistance, thereby reducing pipeline pressure and improving the stability of the check valve. Furthermore, because the grooves 21 are arranged on the outer circumferential surface of the valve core 2 and extend axially through the valve core 2, there is no need to machine the grooves 21 within the valve core 2, effectively simplifying the structure of the grooves 21 and reducing the difficulty of machining them.

[0052] Optionally, the cross-sectional shape of the groove 21 is circular, rectangular, trapezoidal, or triangular, and the number of grooves 21 is 2-8. This shape setting can ensure that the fluid passes through the grooves 21 smoothly, reducing the flow resistance of the pipeline, and the number of grooves 21 can ensure sufficient fluid flow while preventing too many grooves 21 from affecting the structural strength of the valve core 2.

[0053] In other embodiments, grooves 21 of other shapes and numbers may also be provided, as long as fluidity and good structural strength can be ensured, and no further restrictions are imposed herein.

[0054] It's worth noting that the valve core 2 is made of a non-metallic elastomer. During actual operation, the check valve often requires the valve core 2 to frequently switch between an open and a blocked position. This constant impact of the valve core 2 against the outlet of the inflow channel 111 can cause significant noise and easily damage the valve core 2. The non-metallic elastomer effectively cushions impact forces, thereby reducing noise and extending the service life of the check valve. Furthermore, the non-metallic elastomer valve core 2 deforms to a certain extent when blocking the outlet of the inflow channel 111, enhancing the blocking effect and improving the airtightness of the check valve.

[0055] The valve core 2 is preferably made of polytetrafluoroethylene (PTFE), which has high corrosion resistance, high lubricity and non-stick properties, and high mechanical toughness, thereby enhancing the sealing and cushioning effects of the valve core 2 and extending its service life. Of course, the valve core 2 may also be made of other non-metallic elastic materials, as long as they can withstand the impact forces between the valve core 2 and the valve body assembly 1 and produce a certain degree of deformation to enhance the seal. No further restrictions are imposed here.

[0056] To enhance the sealing effect of the valve core 2 on the inflow channel 111, the outlet of the inflow channel 111 is expanded toward the mounting cavity 121 to form a tapered valve opening 1131. A tapered surface 24 is provided on the end of the valve core 2 facing away from the outflow channel 122, and the tapered valve opening 1131 mates with the tapered surface 24. This arrangement improves the compatibility of the valve core 2 with the outlet of the inflow channel 111, thereby enhancing the reliability of the sealing and strengthening the airtightness of the check valve.

[0057] Specifically, the cone angle of the conical valve opening 1131 is greater than or equal to the cone angle of the conical surface 24. When the cone angle of the conical surface 24 is equal to that of the conical valve opening 1131, the two shapes are compatible, improving the rationality and consistency of the structure. When the cone angle of the conical valve opening 1131 is greater than the cone angle of the conical surface 24, the difference between the two cone angles is 0.5°-2°, preferably 1°-1.5°. This arrangement causes the valve core 2 to deform due to the cone angle difference after the two abut, improving the sealing effect between the conical surface 24 and the conical valve opening 1131, and thereby improving the overall airtightness of the check valve.

[0058] like Figure 3 and Figure 6As shown, optionally, a guide surface 22 is formed at the bottom of the groove 21 at one end away from the inflow channel 111, and the guide surface 22 extends obliquely toward the axis of the valve core 2 in the direction away from the inflow channel 111. A conical cavity 1213 is formed at one end of the installation inner cavity 121 away from the inflow channel 111, and the small end of the conical hole faces the outflow channel 122. When the valve core 2 is in the open position, the guide surface 22 is opposite to the hole wall of the conical cavity 1213 and is spaced apart to form a confluence gap 123. Since the fluid will converge into the outflow channel 122 after flowing out of the groove 21, if the fluid flows out directly along the axial direction of the valve core 2, the fluid will impact the cavity wall of the installation cavity 121, thereby increasing the pipeline resistance. In this embodiment, by setting the guide surface 22 and the tapered cavity portion 1213, the fluid can be guided to flow toward the center of the installation cavity 121 when flowing out of the groove 21 under the guiding effect of the inclined converging gap 123, thereby slowing down the impact of the fluid on the cavity wall of the installation cavity 121, making the flow path more unobstructed, and thus reducing the pipeline resistance.

[0059] Exemplarily, the width of the confluence gap 123 is greater than or equal to the depth of the groove 21. This configuration allows the fluid flow range to remain unchanged or expand when the fluid flows out of the groove 21, avoiding resistance to the fluid and thereby reducing pipeline resistance.

[0060] The mounting inner cavity 121 includes a cylindrical cavity 1211 coaxially connected to the tapered cavity 1213. The cylindrical cavity 1211 is located between the seat mounting cavity 125 and the tapered cavity 1213. The diameter of the cylindrical cavity 1211 is equal to the larger diameter of the tapered cavity 1213. The valve core 2 is mounted in the cylindrical cavity 1211. The mounting inner cavity 121 also includes a confluence cavity 1212 coaxially connected between the tapered cavity 1213 and the outflow channel 122. When the valve core 2 is in the open position, the fluid flowing out of the groove 21 flows into the confluence cavity 1212 under the guidance of the confluence slit 123, and then flows through the confluence cavity 1212 to the outflow channel 122.

[0061] like Figure 3 and Figure 4 To enhance the sealing performance between the check valve's valve seat 11 and connecting seat 12, a first conical sealing surface 1132 is provided on the edge of the valve seat 11 near the valve core 2. A second conical sealing surface 124 is provided on the side of the seat body mounting cavity 125 near the mounting inner cavity 121. The small end of the first conical sealing surface 1132 faces the mounting inner cavity 121. The first conical sealing surface 1132 and the second conical sealing surface 124 cooperate to achieve a seal between the valve seat 11 and the connecting seat 12. The conical sealing between the valve seat 11 and the connecting seat 12 not only improves their compatibility, but also enhances assembly efficiency and improves structural rationality.

[0062] Furthermore, the cone angle of the first sealing cone 1132 is smaller than the cone angle of the second sealing cone 124. This arrangement makes the first sealing cone 1132 flatter than the second sealing cone 124, thereby forming a hard seal at the abutment point, thereby improving the airtightness of the check valve. Optionally, the difference in cone angle between the first sealing cone 1132 and the second sealing cone 124 is 0.5°-2°, preferably 1°-1.5°. This cone angle difference ensures the formation of a hard seal while avoiding stress concentration caused by an overly sharp abutment point, which could affect the service life of the check valve.

[0063] In this embodiment, the valve seat 11 is provided with external threads on its outer periphery, and the inner wall of the seat body mounting cavity 125 is provided with internal threads, with the external threads mating with the internal threads. As can be understood, as the valve seat 11 is continuously screwed onto the inner wall of the seat body mounting cavity 125, the first sealing conical surface 1132 and the second sealing conical surface 124 gradually abut against each other until a hard sealing surface is formed, thereby achieving a sealed connection between the valve seat 11 and the connecting seat 12.

[0064] Optionally, the end of the seat mounting cavity 125 facing the mounting inner cavity 121 comprises a first cavity portion 1251 and a second cavity portion 1252. The first cavity portion 1251 is coaxially connected between the second cavity portion 1252 and the mounting inner cavity 121, and the aperture of the first cavity portion 1251 is smaller than that of the second cavity portion 1252. The second sealing conical surface 124 is connected between the circumferential cavity wall of the first cavity portion 1251 and the cavity bottom of the second cavity portion 1252. This arrangement results in the first cavity portion 1251 and the second cavity portion 1252 being arranged in a stepped manner, with the second sealing conical surface 124 located on this step, thereby improving the pressure-bearing capacity of the second sealing conical surface 124 and ensuring a tighter contact between the first sealing conical surface 1132 and the second sealing conical surface 124, thereby enhancing the airtightness of the check valve.

[0065] The seat mounting cavity 125 also includes a third cavity 1253. The second cavity 1252 is coaxially connected between the first cavity 1251 and the third cavity 1253. The aperture of the third cavity 1253 is larger than that of the second cavity 1252. The valve seat 11 includes a valve sleeve 112 and a gas nozzle 113. The valve sleeve 112 is sleeved around the outer periphery of one end of the gas nozzle 113. The outer peripheral wall of the valve sleeve 112 is provided with external threads, and the inner wall of the third cavity 1253 is provided with internal threads. The valve sleeve 112 is threadedly screwed into the third cavity 1253. The gas nozzle 113 is provided with an inflow channel 111, and the other end extends out of the valve sleeve 112 toward one end of the mounting cavity 121. The other end of the gas nozzle 113 is provided with a first sealing conical surface 1132. As the valve sleeve 112 is threadedly screwed into the third cavity 1253, the valve sleeve 112 pushes against the air nozzle 113, causing the first sealing conical surface 1132 to gradually abut against the second sealing conical surface 124 until a hard seal is formed. The valve seat 11 is configured as a two-part structure consisting of the valve sleeve 112 and the air nozzle 113. This not only ensures a seal between the valve seat 11 and the connecting seat 12 of the check valve, but also prevents relative rotation between the first sealing conical surface 1132 and the conical surface 124 during the screwing of the valve sleeve 112 into the third cavity 1253, thereby affecting the sealing effect.

[0066] Optionally, the valve seat 11 and the connecting seat 12 are made of 316 stainless steel or 316L stainless steel. This material provides the valve seat 11 and the connecting seat 12 with excellent corrosion resistance and high-pressure resistance, thereby extending the service life of the check valve. Of course, other materials may be used in other embodiments as long as they ensure good corrosion resistance and high-pressure resistance, and no further restrictions are imposed herein.

[0067] The assembly process of the check valve in this embodiment is as follows:

[0068] First, place the elastic member 3 in the receiving groove 23 at the center of one end of the valve core 2. Then, place the elastic member 3 and the valve core 2 together into the mounting cavity 121 of the connecting seat 12, so that the elastic member 3 abuts against the side wall of the mounting cavity 121 close to the outflow channel 122. At this time, screw the valve seat 11 into the seat body mounting cavity 125 and apply a certain tightening torque until the first sealing cone surface 1132 abuts against the second sealing cone surface 124, completing the assembly of the check valve.

[0069] This embodiment also provides a check system for reducing the flow resistance of the pipeline of the check system and improving the reliability and service life of the check system.

[0070] The check system includes external piping and a check valve, with both the inflow channel 111 and the outflow channel 122 connected to the external piping. The check valves used in the check system achieve one-way flow between the external piping, reducing the cost and flow resistance of the check system's piping, thereby increasing the reliability and service life of the check system.

[0071] Note that the above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A check valve, comprising a valve body assembly (1), wherein the valve body assembly (1) has an inflow channel (111), an installation cavity (121) and an outflow channel (122) connected in sequence, characterized in that: The check valve further comprises a valve core (2), the valve core (2) being a non-metallic elastic body, a plurality of grooves (21) being provided on the circumferential side surface of the valve core (2) at intervals along the circumferential direction, and the grooves (21) being axially connected to the valve core (2); The valve core (2) is slidably mounted in the mounting inner 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 member (3) is provided in the installation inner cavity (121), and the elastic member (3) always applies an elastic force to the valve core (2) to keep or return the valve core (2) to the blocking position.

2. The check valve according to claim 1, characterized in that A guide surface (22) is formed at the bottom of one end of the groove (21) away from the inflow channel (111), and the guide surface (22) extends obliquely toward the axis of the valve core (2) in a direction away from the inflow channel (111); An end of the installation inner cavity (121) away from the inflow channel (111) forms a tapered cavity portion (1213), and a small end of the tapered cavity portion (1213) faces the outflow channel (122); When the valve core (2) is located at the open position, the flow guide surface (22) is opposite to the hole wall of the tapered cavity (1213) and is spaced apart to form a converging gap (123).

3. The check valve according to claim 2, characterized in that: The width of the confluence gap (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) is expanded in a direction toward the installation inner cavity (121) to form a conical valve port (1131), and a conical surface (24) is provided at one end of the valve core (2) away from the outflow channel (122). When the valve core (2) is in the blocking position, the hole wall of the conical valve port (1131) and the conical surface (24) are in contact with each other, and the conical angle of the conical valve port (1131) is greater than or equal to the conical angle of the conical surface (24).

5. The 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 the grooves (21) is 2-8.

6. The check valve according to any one of claims 1 to 5, characterized in that: The valve body assembly (1) comprises a detachably connected valve seat (11) and a connecting seat (12), wherein the valve seat (11) has the inflow channel (111), and the connecting seat (12) has a seat body mounting cavity (125), the mounting inner cavity (121) and the outflow channel (122) which are connected in sequence, and the valve seat (11) is sealingly mounted in the seat body mounting cavity (125).

7. The check valve according to claim 6, characterized in that The valve seat (11) is provided with a first sealing conical surface (1132) on one end edge close to the valve core (2), and the cavity wall of the seat body installation cavity (125) close to the installation inner cavity (121) has a second sealing conical surface (124), the small end of the first sealing conical surface (1132) faces the installation inner cavity (121), and the first sealing conical surface (1132) cooperates with the second sealing conical surface (124) to achieve sealing between the valve seat (11) and the connecting seat (12).

8. The check valve according to claim 7, characterized in that The cone angle of the first sealing cone surface (1132) is smaller than the cone angle of the second sealing cone surface (124), and the difference between the cone angles of the first sealing cone surface (1132) and the second sealing cone surface (124) is 0.5°-2°.

9. The check valve according to claim 7, characterized in that: The seat body mounting cavity (125) has a first cavity portion (1251) and a second cavity portion (1252) at one end facing the mounting inner cavity (121), the first cavity portion (1251) is coaxially connected between the second cavity portion (1252) and the mounting inner cavity (121), and the aperture of the first cavity portion (1251) is smaller than the aperture of the second cavity portion (1252), and the second sealing cone surface (124) is connected between the circumferential cavity wall of the first cavity portion (1251) and the cavity bottom of the second cavity portion (1252).

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

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