Check valve

Abstract

The utility model relates to the technical field of valves, and discloses a check valve. The check valve comprises a valve body and a check assembly, a flow channel is formed in the valve body, and a sealing face is formed in the flow channel; the check assembly comprises a check valve deck, a check valve clack and a bush, the check valve deck is connected to the outlet end of the flow channel, the bush is limited between the check valve deck and the valve body, a guide hole is formed in the bush, the check valve clack comprises a sealing part and a guide rod part which are connected, the guide rod part is arranged in the guide hole in a sliding and penetrating mode, and the sealing part can be matched with the sealing face in a sealing mode. According to the check valve, the check valve cover and the lining which are separated from each other are arranged, and the guide hole which can be in sliding fit with the guide rod part of the check valve clack is formed in the lining, so that the machining precision and the machining difficulty of the check valve cover can be greatly reduced, and the machining cost is reduced to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a check valve. Background Technology

[0002] A locking valve is a type of valve that uses a special key to manually cut off or connect the flow of media in a pipeline. It can be widely used in various pipelines for liquid control and can prevent theft of liquid media and cut off the water supply in case of malicious non-payment.

[0003] Most existing locking valves are magnetic locking valves, which rely on magnetic force to control the locking and unlocking of the valve. Magnetic locking valves typically include a valve body, a valve cover, and a valve stem assembly. The valve body has a flow channel, the valve cover is located on the valve body, and the valve stem assembly includes a valve stem and a valve core. Rotation of the valve stem causes the valve core to open and close the flow channel on the valve body. To prevent backflow of liquid in the flow channel, related technologies propose a magnetic locking valve with a check function, i.e., a check valve. The check valve also includes a check assembly, which includes a check valve cover, a valve disc, and an elastic element. The check valve cover is connected to the outlet of the flow channel and has an integrally formed guide hole. The inner wall of the flow channel in the valve body also has a sealing surface located between the valve core and the outlet of the flow channel. The valve disc includes a connected sealing part and a guide rod part. The sealing part can press the sealing surface tightly under the elastic pressure of the elastic element, and the guide rod part slides through the guide hole of the check valve cover. However, the above-mentioned settings usually require high machining accuracy for the check valve cover, which is difficult to machine. When there is a machining error in the check valve cover, it is easy to cause the valve disc to not be installed accurately, thereby affecting the check valve's check performance.

[0004] Therefore, there is an urgent need for a check valve to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a check valve that can reduce processing difficulty and cost while ensuring the performance of the check valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A check valve, comprising:

[0008] The valve body has a flow channel inside, and a sealing surface is formed in the flow channel;

[0009] A check valve assembly includes a check valve cover, a check valve disc, and a bushing. The check valve cover is connected to the outlet end of the flow channel. The bushing is located between the check valve cover and the valve body and has a guide hole. The check valve disc includes a sealing part and a guide rod part connected to each other. The guide rod part slides through the guide hole. The sealing part can seal with the sealing surface.

[0010] As a preferred embodiment of the check valve provided by this utility model, the bushing is made of plastic material; and / or the check valve disc is made of plastic material.

[0011] As a preferred embodiment of the check valve provided by this utility model, the check assembly further includes a check elastic element, which is sleeved on the guide rod portion, and both ends of the check elastic element abut against the sealing portion and the bushing, respectively.

[0012] As a preferred embodiment of the check valve provided by this utility model, the bushing includes a bushing body and at least two limiting claws, each of the limiting claws being spaced apart on the bushing body along the circumference, and the sealing part being confined within the limiting space formed by the limiting claws.

[0013] As a preferred embodiment of the check valve provided by this utility model, the inner wall of the check valve cover is provided with a first limiting part, the inner wall of the flow channel is provided with a second limiting part, and the two ends of the bushing abut against the first limiting part and the second limiting part, respectively.

[0014] As a preferred embodiment of the check valve provided by this utility model, the check assembly further includes a check seal, which is sleeved on the sealing part and can seal and fit with the sealing surface.

[0015] As a preferred embodiment of the check valve provided by this utility model, the outer diameter D1 of the check seal is less than or equal to D0, where D0 is the diameter of the side of the sealing part that is in contact with the check seal away from the sealing surface.

[0016] As a preferred embodiment of the check valve provided by this utility model, D0-D1≥0.2mm~0.5mm.

[0017] As a preferred embodiment of the check valve provided by this utility model, the guide rod portion is clearance-fitted with the guide hole, and the radius R1 of the guide rod portion is 0.01mm to 0.125mm smaller than the diameter R2 of the guide hole.

[0018] As a preferred embodiment of the check valve provided by this utility model, the check valve is a check gate valve, a check ball valve, a check stop valve, or a check pressure reducing valve.

[0019] The beneficial effects of this utility model are as follows:

[0020] The check valve provided by this utility model can prevent the backflow of liquid medium downstream of the flow channel by setting a check component. By setting a separate check valve cover and bushing, and setting a guide hole on the bushing that can slide with the guide rod of the check valve disc, the machining accuracy and machining difficulty of the check valve cover can be greatly reduced, thereby reducing the machining cost to a certain extent. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the check valve provided in this embodiment of the utility model;

[0023] Figure 2 This is a cross-sectional schematic diagram of the check valve provided in this embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the main valve cover provided in an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional schematic diagram of the main valve cover provided in an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the first structure of the rotating cover provided in this embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the valve stem structure provided in an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the second structure of the rotating cover provided in this embodiment of the utility model;

[0029] Figure 8 This is a schematic diagram of the key body provided in an embodiment of the present utility model;

[0030] Figure 9 This is a schematic diagram of the first structure of the bushing provided in this embodiment of the utility model;

[0031] Figure 10 This is a schematic diagram of the second structure of the bushing provided in this embodiment of the utility model;

[0032] Figure 11 This is a schematic diagram of the mating structure of the check valve disc, check elastic element, and sealing element provided in this embodiment of the utility model;

[0033] Figure 12 This is a schematic diagram of the structure of the check valve cover provided in this embodiment of the utility model;

[0034] Figure 13 This is a cross-sectional schematic diagram of the check valve cover provided in an embodiment of this utility model.

[0035] Figure label:

[0036] 10. Valve body assembly; 11. Valve body; 111. Flow channel; 1110. Sealing surface; 1111. Outlet end; 1112. Second limiting part; 112. Mounting port; 12. Main valve cover; 121. Through hole; 122. First locking hole; 123. Limiting structure;

[0037] 20. Check valve assembly; 21. Check valve cover; 211. First limiting part; 22. Check valve disc; 221. Sealing part; 2211. Receiving groove; 222. Guide rod part; 23. Check elastic element; 24. Bushing; 241. Bushing body; 2411. Guide hole; 242. Limiting claw; 25. Check seal;

[0038] 30. Valve stem assembly; 31. Valve stem; 311. Limiting protrusion; 312. Insertion part; 32. Valve core;

[0039] 40. Rotating cover; 401. Second locking hole; 402. First insertion slot; 403. Insertion protrusion;

[0040] 50. Pin assembly; 51. Magnetic pin; 52. Locking elastic element;

[0041] 60. Magnetic key; 61. Key body; 611. Second insertion slot; 612. Mounting slot; 62. Magnetic component;

[0042] 701, First seal; 702, Second seal. Detailed Implementation

[0043] Before explaining any embodiment of the present invention in detail, it should be understood that the present invention is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0044] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0045] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0046] In this invention, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0047] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0048] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can be performed by one part, one component, or a combination of multiple parts.

[0049] In this utility model, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when one element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent the direct orientation but can also be understood as the lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0050] This utility model provides a check valve, which is used in various pipelines to cut off or connect the flow of media in the pipeline, so as to prevent theft of liquid media and cut off water supply in case of malicious non-payment. The check valve can be a check gate valve, check ball valve, check globe valve, or check pressure reducing valve, and no specific limitation is made here. The specific structure and working principle of the check valve provided by this utility model are described in detail below through several embodiments.

[0051] Example 1

[0052] Figure 1 A schematic diagram of the check valve provided in this embodiment is shown. Figure 2 A cross-sectional schematic diagram of the check valve provided in this embodiment is shown. Figures 1-2 As shown, the check valve provided in this embodiment includes a valve body assembly 10 and a valve stem assembly 30. The valve body assembly 10 includes a valve body 11 and a main valve cover 12. The valve body 11 has a flow channel 111 and an installation port 112 connected to the flow channel 111. The two ends of the flow channel 111 are used to connect to external pipelines so that the liquid medium in the external pipeline can flow through the flow channel 111. The main valve cover 12 is installed in the installation port 112. The valve stem assembly 30 includes a valve stem 31 and a valve core 32 connected to the valve stem 31. The valve stem 31 is rotatably inserted into the valve body assembly 10. The valve core 32 is located in the flow channel 111. By rotating the valve stem 31 around the axis in different directions, the valve core 32 can be lowered or raised, thereby cutting off or connecting the flow channel 111, realizing the interception or flow of the liquid medium, thereby realizing the closing or opening of the magnetic locking valve.

[0053] In this embodiment, the valve stem 31 is threaded to the valve core 32. By rotating the valve stem 31, the valve core 32 can be moved along the axial direction of the valve stem 31. The valve stem assembly 30 has a simple structure, is easy to manufacture, and is easy to adjust.

[0054] In this embodiment, the main valve cover 12 is threadedly connected to the mounting port 112 of the valve body 11. Threaded connections offer the advantages of easy assembly and disassembly, and a secure connection. To prevent liquid media in the flow channel 111 from leaking through the gap between the valve body 11 and the main valve cover 12, a first sealing element 701 is also provided between the valve body 11 and the main valve cover 12. The first sealing element 701 can be a sealing ring.

[0055] like Figure 2 As shown, a through hole 121 is provided in the main valve cover 12. The through hole 121 extends along the axial direction of the main valve cover 12. One end of the valve stem 31 is rotatably installed in the through hole 121, and the other end of the valve stem 31 is connected to the valve core 32. The through hole 121 on the main valve cover 12 can facilitate the quick positioning and installation of the valve stem assembly 30.

[0056] Optionally, the through hole 121 is a stepped hole, and the end of the valve stem 31 facing away from the valve core 32 is rotatably inserted into the small diameter section of the through hole 121. A limiting protrusion 311 is provided on the side wall of the valve stem 31, and the top of the limiting protrusion 311 can abut against the stepped surface of the through hole 121, thereby limiting the upward movement of the valve stem assembly 30.

[0057] Optionally, a limiting structure 123 is provided at the bottom of the through hole 121, and the bottom surface of the limiting protrusion 311 abuts against the limiting structure 123. The limiting structure 123 can prevent the valve stem assembly 30 from falling out of the through hole 121. In this embodiment, the limiting structure 123 is a limiting nut, which is threaded to the inner wall of the through hole 121. The valve stem 31 passes through the limiting nut and can rotate relative to the limiting nut.

[0058] To ensure a tight seal between the valve stem 31 and the main valve cover 12, a second seal 702 is provided between the valve stem 31 and the through hole 121. The second seal 702 prevents leakage of liquid medium between the valve stem 31 and the through hole 121. In this embodiment, the second seal 702 is a rubber sealing ring.

[0059] Figure 3 A schematic diagram of the main valve cover 12 provided in this embodiment is shown. Figure 4 A cross-sectional schematic diagram of the main valve cover 12 provided in this embodiment is shown. Figure 5 A first structural schematic diagram of the rotating cover 40 provided in this embodiment is shown. (See attached diagram.) Figures 3-5 and combined Figure 2As shown, in order to switch the check valve between the locked and unlocked states, the check valve also includes a rotating cover 40 and a pin assembly 50. The rotating cover 40 is rotatably fitted onto the top of the main valve cover 12 and is circumferentially fixed to the top of the valve stem 31. The main valve cover 12 is provided with a first locking hole 122, and the rotating cover 40 is provided with a second locking hole 401 opposite to the first locking hole 122. The pin assembly 50 includes a magnetic pin 51 and a locking elastic element 52. The magnetic pin 51 can be simultaneously inserted into the first locking hole 122 and the second locking hole 401 under the elastic action of the locking elastic element 52, and can compress the locking elastic element 52 under the action of external magnetic force and retract into the first locking hole 122 or the second locking hole 401, so that the rotating cover 40 can rotate relative to the main valve cover 12 and drive the valve stem 31 to rotate synchronously. In other words, without the action of external magnetic force, the magnetic pin 51 is simultaneously inserted into the first locking hole 122 and the second locking hole 401, so that the rotating cover 40 is relatively fixed with the main valve cover 12. At this time, the rotating cover 40 cannot rotate relative to the main valve cover 12. When an external magnetic force is applied, the magnetic pin 51 can compress the locking elastic element 52 and retract into the first locking hole 122 or the second locking hole 401, that is, disengage from the second locking hole 401 or the first locking hole 122, thereby releasing the lock between the rotating cover 40 and the main valve cover 12. At this time, the rotating cover 40 can rotate relative to the main valve cover 12 and drive the valve stem 31 to rotate synchronously, thereby driving the valve core 32 to open and close the flow channel 111.

[0060] In this embodiment, the locking elastic member 52 is compressed and housed in the second lock hole 401. Both ends of the locking elastic member 52 are connected to the rotating cover 40 and the magnetic pin 51, respectively. Under the elastic action of the locking elastic member 52, part of the magnetic pin 51 is housed in the first lock hole 122 and the other part is housed in the second lock hole 401, so as to lock the rotating cover 40 and the main valve cover 12 without the action of external magnetic force. When an external magnetic attraction force is applied, the magnetic pin 51 can overcome the elastic force of the locking elastic member 52, disengage from the first lock hole 122 and retract into the second lock hole 401, thereby unlocking the rotating cover 40 and the main valve cover 12.

[0061] Figure 6 A schematic diagram of the valve stem 31 provided in this embodiment is shown. Figure 6 and combined Figure 5As shown, the inner top of the rotating cover 40 is provided with a first insertion groove 402. The end of the valve stem 31 facing away from the valve core 32 is provided with an insertion part 312 that engages with the first insertion groove 402. The cross-sectional shape of the first insertion groove 402 is non-circular, and the shape of the insertion part 312 matches the shape of the first insertion groove 402. This design ensures that the rotating cover 40 can drive the valve stem 31 to rotate synchronously when rotating, avoiding relative rotation between the two. It should be noted that the non-circular shape can be a triangle, rectangle, hexagon, or other polygons, or a regular shape formed by alternating straight lines and curves, or an irregular shape formed by straight lines and curves, or a regular or irregular shape formed by curves. This embodiment does not limit this.

[0062] like Figure 2 As shown, the check valve also includes a magnetic key 60 that is compatible with the rotating cover 40. The magnetic key 60 provides external magnetic force to the magnetic pin 51. When it is necessary to switch the check valve from the locked state to the unlocked state, the magnetic key 60 can be used to provide external magnetic force to the magnetic pin 51, so that the magnetic pin 51 disengages from the first locking hole 122 and retracts into the second locking hole 401. At this time, the operator can rotate the rotating cover 40 to drive the valve stem 31 to rotate, thereby opening and closing the flow channel 111 of the valve core 32.

[0063] Figure 7 A second structural schematic diagram of the rotating cover 40 provided in this embodiment is shown. Figure 8 A schematic diagram of the key body 61 provided in this embodiment is shown. Figures 7-8 and combined Figure 2 As shown, the magnetic key 60 includes a key body 61 and a magnetic component 62. The key body 61 is provided with a second insertion groove 611, and the top of the rotating cover 40 is provided with an insertion protrusion 403 that can be inserted and engaged with the second insertion groove 611. The magnetic component 62 is embedded in the key body 61, and the magnetic component 62 is magnetically attracted to the magnetic pin 51. In this embodiment, the number of sets of magnetic components 62 is equal to the number of sets of magnetic pins 51. When the magnetic components 62 and the magnetic pins 51 are opposite each other, a mutual attraction force is generated between them, so that the magnetic pins 51 compress the locking elastic component 52 and disengage from the first keyhole 122.

[0064] To ensure stable installation of the magnetic component 62, a mounting groove 612 for accommodating the magnetic component 62 is provided on the key body 61. The magnetic component 62 is adhered to the mounting groove 612, ensuring a secure connection and facilitating operation.

[0065] Figure 9 A first structural schematic diagram of the bushing 24 provided in this embodiment is shown. Figure 10 A second structural schematic diagram of the bushing 24 provided in this embodiment is shown. Figure 11This diagram illustrates the mating structure of the check valve disc 22, the check elastic element 23, and the check seal 25 provided in this embodiment. Figures 9-11 and combined Figure 2 As shown, the check valve also includes a check assembly 20. A sealing surface 1110 is formed within the flow channel 111 of the valve body 11, and the sealing surface 1110 is located between the valve core 32 and the outlet end 1111 of the flow channel 111. The check assembly 20 includes a check valve cover 21, a check valve disc 22, and a bushing 24. The check valve cover 21 is connected to the outlet end 1111, and the bushing 24 is located between the check valve cover 21 and the valve body 11. The bushing 24 is provided with a guide hole 2411. The check valve disc 22 includes a sealing part 221 and a guide rod part 222 connected to each other. The guide rod part 222 slides through the guide hole 2411, and the sealing part 221 can seal with the sealing surface 1110. By providing the check assembly 20, the backflow of liquid medium downstream of the flow channel 111 can be prevented. By setting separate check valve cover 21 and bushing 24, and providing guide hole 2411 on bushing 24 that can slide with guide rod 222 of check valve disc 22, the machining accuracy and machining difficulty of check valve cover 21 can be greatly reduced, thereby reducing machining costs to a certain extent.

[0066] Optionally, the check valve assembly 20 further includes a check valve spring 23, which is sleeved on the guide rod portion 222, with its two ends abutting against the sealing portion 221 and the bushing 24, respectively. When the pressure at the inlet end of the flow channel 111 is greater than the pressure at its outlet end 1111, the liquid medium can push the check valve disc 22 away from the sealing surface 1110, while compressing the check valve spring 23. At this time, the liquid medium at the inlet end of the flow channel 111 can flow out through the gap between the sealing portion 221 and the sealing surface 1110 to the outlet end 1111 of the flow channel 111. When the flow channel 111 is cut off, the check valve disc 22 can be reset under the elastic restoring force of the check valve spring 23 and press against the sealing surface 1110 under the elastic force of the check valve spring 23, thereby preventing the backflow of the liquid medium. In this embodiment, the check valve spring 23 is a spring, which is easy to install and has a low cost.

[0067] In related technologies, the guide hole is located on a metal check valve cover. When metal is immersed in a liquid medium for a long time, metal oxide impurities are easily precipitated, leading to scale buildup in the gap between the guide rod and the guide hole. This can cause the guide rod to become stuck in the guide hole, preventing it from sliding smoothly. To solve this problem, in this embodiment, the check valve disc 22 is made of plastic; the bushing 24 is also made of plastic. This effectively prevents scale buildup in the gap between the guide rod 222 and the guide hole 2411, avoiding jamming and ensuring the stability and smoothness of the sliding process of the guide rod 222 relative to the guide hole 2411.

[0068] Optionally, the check valve disc 22 is a one-piece molded structure, omitting the connection between the sealing part 221 and the guide rod part 222, saving the connecting parts between the two, thereby reducing production costs and improving the overall structural stability of the check valve disc 22. In this embodiment, the check valve disc 22 is molded using injection molding, which has the advantages of high molding precision, good consistency, and low cost.

[0069] To further ensure the stability of the sliding process of the guide rod portion 222 relative to the guide hole 2411, in this embodiment, the guide rod portion 222 and the guide hole 2411 are fitted with a clearance, and the radius R1 of the guide rod portion 222 is 0.01mm to 0.125mm smaller than the diameter R2 of the guide hole 2411. Experimental verification shows that this clearance range can ensure stable sliding of the guide rod portion 222 relative to the guide hole 2411 while preventing the axial direction of the guide rod portion 222 from deviating too much from the axial direction of the guide hole 2411, thus avoiding affecting the sealing effect between the sealing portion 221 and the sealing surface 1110. For example, the radius R1 of the guide rod portion 222 can be 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, etc., smaller than the diameter R2 of the guide hole 2411. Of course, the difference between R1 and R2 is not limited to the above range. Designers can also adjust the difference between R1 and R2 according to actual processing requirements.

[0070] like Figure 2 , Figure 9 and Figure 10As shown, the bushing 24 includes a bushing body 241 and at least two limiting claws 242. Each limiting claw 242 is spaced circumferentially on the bushing body 241, and the sealing portion 221 is confined within the limiting space formed by the limiting claws 242. The limiting claws 242 guide and limit the movement of the check valve disc 22, allowing it to move along the extension direction of the limiting claws 242 within the limiting space, thereby preventing the check valve disc 22 from becoming eccentric.

[0071] In this embodiment, there are three limiting claws 242. These three claws form a circular limiting space, providing guidance and limiting for the installation and movement of the check valve disc 22. This effectively prevents the check valve disc 22 from becoming eccentric and reduces the number of limiting claws 242, thereby lowering the manufacturing cost of the check valve. Of course, in other embodiments, the number of limiting claws 242 can be four, five, six, or even more. This embodiment does not limit the specific number of limiting claws 242; designers can adjust it according to actual manufacturing requirements.

[0072] Optionally, the bushing 24 is a one-piece molded structure, omitting the connection between the bushing body 241 and the limiting claw 242, saving on connecting parts, thereby reducing production costs and improving the overall structural stability of the bushing 24. In this embodiment, the bushing 24 is molded using injection molding, which has the advantages of high molding precision, good consistency, and low cost.

[0073] like Figure 2 and Figure 11 As shown, the check valve assembly 20 also includes a check valve seal 25, which is sleeved on the sealing portion 221 and can seal against the sealing surface 1110 to improve the sealing effect between the sealing portion 221 and the sealing surface 1110. In this embodiment, the check valve seal 25 is a rubber sealing ring, which has a high sealing effect, is easy to install, and is readily available and inexpensive.

[0074] Optionally, a receiving groove 2211 for accommodating the check seal 25 is provided on the side wall of the sealing part 221. By providing the receiving groove 2211, the check seal 25 can be stably installed, preventing it from shifting or falling off during use.

[0075] like Figure 11As shown, the outer diameter D1 of the check seal 25 is less than or equal to D0, where D0 is the diameter of the side of the sealing part 221 that is in contact with the check seal 25 away from the sealing surface 1110. This design allows the sealing part 221 to completely press the check seal 25 against the sealing surface 1110 under the elastic force of the check elastic member 23. In other words, one side of the check seal 25 is completely in contact with the sealing surface 1110, and the other side of the check seal 25 is completely in contact with the sealing part 221. This effectively prevents the liquid medium downstream of the flow channel 111 from passing through the gap between the check seal 25 and the sealing part 221, thus affecting the check valve's check function.

[0076] Optionally, D0-D1 ≥ 0.2mm~0.5mm. This difference range ensures that both sides of the check seal 25 are tightly fitted to the sealing surface 1110 and the sealing portion 221, respectively, and reduces the material used in the check seal 25, thus lowering processing costs. For example, the difference between D0 and D1 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. Of course, the difference between D0 and D1 is not limited to the above range, and designers can adjust the difference between D0 and D1 according to actual needs.

[0077] Figure 12 A schematic diagram of the structure of the check valve cover 21 provided in this embodiment is shown. Figure 13 A cross-sectional schematic diagram of the check valve cover 21 provided in this embodiment is shown. Figures 12-13 and combined Figure 2 As shown, a first limiting portion 211 is formed on the inner wall of the check valve cover 21, and a second limiting portion 1112 is formed on the inner wall of the flow channel 111. The two ends of the bushing 24 abut against the first limiting portion 211 and the second limiting portion 1112, respectively. By providing the first limiting portion 211 and the second limiting portion 1112, the bushing 24 can be limited to ensure its stable fixation. The first limiting portion 211 is located inside the check valve cover 21, allowing the bushing 24 to be partially accommodated within the check valve cover 21 during installation, further improving the stability of the bushing 24's installation.

[0078] In this embodiment, the first limiting part 211 is a protruding structure protruding into the check valve cover 21, and the second limiting part 1112 is a protruding structure protruding into the valve body 11. The structure is simple and easy to process and manufacture.

[0079] Optionally, the check valve cover 21 is threaded onto the valve body 11. That is, when machining the check valve cover 21, it is also necessary to machine external threads on the check valve cover 21, set the first limiting part 211 as a protruding structure inside the check valve cover 21, and increase the thickness of the check valve cover 21 at this position, thereby avoiding deformation of the first limiting part 211 when machining the threads.

[0080] The following is combined Figures 1-13 Briefly describe the working principle of this check valve:

[0081] 1) When it is necessary to switch from the locked state to the unlocked state, the operator can align the second insertion slot 611 of the magnetic key 60 with the rotating cover 40 and insert it to make the two engage. The magnetic pin 51 can overcome the elastic force of the locking elastic element 52 under the magnetic attraction of the magnetic element 62, so as to disengage from the first lock hole 122 and retract into the second lock hole 401. At this time, the operator can turn the magnetic key 60 to drive the rotating cover 40 to rotate, thereby driving the valve stem 31 to rotate synchronously, thereby controlling the check valve to open or close.

[0082] 2) When it is necessary to switch from the unlocked state to the locked state, the operator can remove the magnetic key 60 from the rotating cover 40. The magnetic attraction of the magnetic component 62 to the magnetic pin 51 will disappear, and the magnetic pin 51 can be reset under the elastic force of the locking elastic component 52, so as to move from the second lock hole 401 to the first lock hole 122. At this time, the magnetic pin 51 can lock the rotating cover 40 and the main valve cover 12, and the rotating cover 40 can no longer rotate relative to the main valve cover 12.

[0083] Example 2

[0084] This embodiment provides a check valve, the specific structure of which is roughly the same as that in Embodiment 1, the difference being that the pin assembly 50 is positioned differently.

[0085] Specifically, refer to Figure 2 In this embodiment, the locking elastic member 52 is compressed and housed in the first locking hole 122. Both ends of the locking elastic member 52 are connected to the main valve cover 12 and the magnetic pin 51, respectively. Under the elastic action of the locking elastic member 52, part of the magnetic pin 51 is housed in the first locking hole 122 and the other part is housed in the second locking hole 401, so as to lock the rotating cover 40 and the main valve cover 12 without the action of external magnetic force. When an external magnetic repulsion force is applied, the magnetic pin 51 can overcome the elastic force of the locking elastic member 52, disengage from the second locking hole 401 and retract into the first locking hole 122, thereby unlocking the rotating cover 40 and the main valve cover 12.

[0086] It is understood that in this embodiment, there is a magnetic repulsion between the magnetic component 62 and the magnetic pin 51.

[0087] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments do not limit this utility model in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A check valve, characterized in that, include: Valve body (11), wherein a flow channel (111) is provided inside the valve body (11), and a sealing surface (1110) is formed inside the flow channel (111); The check valve assembly (20) includes a check valve cover (21), a check valve disc (22), and a bushing (24). The check valve cover (21) is connected to the outlet end (1111) of the flow channel (111). The bushing (24) is located between the check valve cover (21) and the valve body (11), and a guide hole (2411) is provided on the bushing (24). The check valve disc (22) includes a sealing part (221) and a guide rod part (222) connected to each other. The guide rod part (222) slides through the guide hole (2411), and the sealing part (221) can seal with the sealing surface (1110).

2. The check valve according to claim 1, characterized in that, The bushing (24) is made of plastic; and / or the check valve disc (22) is made of plastic.

3. The check valve according to claim 1, characterized in that, The check valve assembly (20) further includes a check valve elastic element (23), which is sleeved on the guide rod portion (222), and the two ends of the check valve elastic element (23) abut against the sealing portion (221) and the bushing (24) respectively.

4. The check valve according to claim 1, characterized in that, The bushing (24) includes a bushing body (241) and at least two limiting claws (242). Each of the limiting claws (242) is arranged at intervals along the circumference of the bushing body (241) on the bushing body (241), and the sealing part (221) is confined within the limiting space formed by the limiting claws (242).

5. The check valve according to claim 1, characterized in that, The inner wall of the check valve cover (21) has a first limiting part (211), and the inner wall of the flow channel (111) has a second limiting part (1112). The two ends of the bushing (24) abut against the first limiting part (211) and the second limiting part (1112) respectively.

6. The check valve according to claim 1, characterized in that, The check valve assembly (20) further includes a check valve seal (25), which is sleeved on the sealing part (221) and can seal against the sealing surface (1110).

7. The check valve according to claim 6, characterized in that, The outer diameter D1 of the check seal (25) is less than or equal to D0, where D0 is the diameter of the side of the sealing part (221) that is in contact with the check seal (25) away from the sealing surface (1110).

8. The check valve according to claim 7, characterized in that, D0-D1≥0.2mm~0.5mm.

9. The check valve according to claim 1, characterized in that, The guide rod portion (222) is clearance-fitted with the guide hole (2411), and the radius R1 of the guide rod portion (222) is 0.01mm to 0.125mm smaller than the hole diameter R2 of the guide hole (2411).

10. The check valve according to any one of claims 1 to 9, characterized in that, The check valve is a check gate valve, a check ball valve, a check stop valve, or a check pressure reducing valve.

Images