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 and a sealing face formed on the flow channel wall of the flow channel are arranged in the valve body. The non-return assembly comprises a non-return valve clack and a non-return lining, the non-return lining is installed at the outlet end of the flow channel, the non-return lining comprises a lining body and at least two limiting clamping jaws, the limiting clamping jaws are arranged on the lining body in the circumferential direction of the lining body at intervals, and a limiting space is defined by the limiting clamping jaws; a valve clack limiting part is arranged on the inner side of each limiting clamping jaw; the check valve clack comprises a sealing part capable of being matched with the sealing face in a sealing mode, the sealing part is movably limited in the limiting space, and when the sealing part abuts against the valve clack limiting part, an interval L exists between the sealing part and the lining body. According to the check valve, the situation that when the check valve clack is switched between the opening position and the sealing position, the check valve clack frequently collides with the check bush, and consequently the check bush breaks and loses efficacy can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a check valve. BACKGROUND

[0002] The check valve is a kind of valve that automatically prevents medium (such as liquid, gas or steam) from flowing backward, and can be automatically opened or closed according to the flow direction of medium without external operation.When the medium flows forward, it can push the valve flap to open to allow the medium to pass through;When the medium flows backward, the medium pressure and spring force act together to close the valve flap to prevent the medium from flowing backward.

[0003] The check valve usually includes a valve body and a check assembly, the valve body is provided with a flow channel and a sealing surface formed on the flow channel wall, the check assembly includes a check valve flap and a check bushing, the check valve flap can be sealingly matched with the sealing surface, the check bushing is installed at the outlet end of the flow channel, and the check bushing includes a bushing body and a plurality of limiting clamping claws connected to the bushing body, the check valve flap is movably arranged in the limiting space formed by the plurality of limiting clamping claws.When the medium flows forward, it can push the check valve flap to move away from the sealing surface to make the medium pass through the flow channel of the valve body.But in the process, the check valve flap will collide with the bushing body, and after long-term use, the connecting position of the bushing body and the limiting clamping claw is prone to breakage, thereby affecting the normal use of the check valve.

[0004] Therefore, there is an urgent need for a check valve to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of check valve, can avoid the breakage failure of check bushing caused by frequent collision between check valve flap and check bushing when switching between opening position and sealing position, to prolong the service life of check bushing, reduce the maintenance cost of the check valve.

[0006] In order to achieve the above target, the utility model adopts the following technical solutions:

[0007] A check valve, comprising:

[0008] A valve body is provided with a flow channel and a sealing surface formed on the flow channel wall of the flow channel;

[0009] The check valve assembly comprises a check valve disc and a check bushing, the check bushing is installed at the outlet end of the flow channel, the check bushing comprises a bushing body and at least two limiting claws, each limiting claw is arranged on the bushing body in a circumferential direction of the bushing body, and each limiting claw surrounds to form a limiting space, and the inner side of each limiting claw is provided with a valve disc limiting part; the check valve disc comprises a sealing part capable of sealing cooperation with the sealing surface, and the sealing part is movably limited in the limiting space, and when the sealing part abuts against the valve disc limiting part, there is a gap L between the sealing part and the bushing body.

[0010] As a preferred scheme of the check valve provided by the utility model, the valve disc limiting part is a limiting step protruding on the inner side of the limiting claw.

[0011] As a preferred scheme of the check valve provided by the utility model, the check valve disc further comprises a guide rod part connected with the sealing part, the bushing body is provided with a guide hole, and the guide rod part is slidably arranged in the guide hole.

[0012] As a preferred scheme of the check valve provided by the utility model, the guide rod part is in clearance fit with the guide hole.

[0013] As a preferred scheme of the check valve provided by the utility model, the bushing body comprises an inner ring bushing, an outer ring bushing and a connecting rod part, the inner ring bushing is annular, the inner ring hole of the inner ring bushing forms the guide hole, the outer ring bushing is annularly arranged outside the inner ring bushing, the connecting rod part is connected with the outer wall of the inner ring bushing and the inner wall of the outer ring bushing respectively, and the limiting claw is connected with the outer ring bushing.

[0014] As a preferred scheme of the check valve provided by the utility model, the number of the connecting rod parts is at least two, and each connecting rod part is arranged in a circumferential direction of the inner ring bushing.

[0015] As a preferred scheme of the check valve provided by the utility model, the check bushing is prepared from a plastic material; and / or the check valve disc is prepared from a plastic material.

[0016] As a preferred scheme of the check valve provided by the utility model, the check valve assembly further comprises a check elastic member, and the two ends of the check elastic member abut against the sealing part and the bushing body respectively.

[0017] As a preferred scheme of the check valve provided by the utility model, the check assembly further comprises a check valve cover, the check valve cover is connected to the outlet end, and an inner wall of the check valve cover is formed with a first limiting part, a flow passage wall of the flow passage is formed with a second limiting part, and the check bushing is limited between the first limiting part and the second limiting part.

[0018] As a preferred scheme of the check valve provided by the 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 utility model discloses beneficial effect lies in:

[0020] The check valve provided by the utility model can avoid the backflow of fluid medium downstream of the flow passage by arranging the check assembly. By arranging at least two limiting clamps, each limiting clamp can surround the limiting space of the sealing part of the check valve disc to limit the movement of the sealing part in the limiting space along the extension direction of the limiting clamp, thereby ensuring the stability of the check valve disc during movement and avoiding the eccentricity of the check valve disc during movement. By arranging the valve disc limiting part on the inner side of the limiting clamp, the maximum displacement of the check valve disc can be limited. When the sealing part abuts against the valve disc limiting part, there is a gap L between the sealing part and the bushing body, which can prevent the sealing part from frequently colliding with the bushing body, thereby preventing the connection between the bushing body and the limiting clamp from being broken and failing, thereby prolonging the service life of the check bushing and reducing the maintenance cost of the check valve. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the description of the embodiments of the utility model will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings without creative labor.

[0022] Figure 1 is a structural schematic view of the check valve provided by the utility model;

[0023] Figure 2 is a sectional view of the check valve provided by the utility model;

[0024] Figure 3 is one of the structural schematic views of the check bushing provided by the utility model;

[0025] Figure 4 is a structural schematic view of the check valve cover provided by the utility model;

[0026] Figure 5is a sectional view of the check valve cover provided by the utility model;

[0027] Figure 6 is a cooperation structure schematic view of the check valve disc, the check elastic member and the check sealing member provided by the utility model;

[0028] Figure 7 is an exploded structure schematic view of the check valve disc, the check elastic member and the check sealing member provided by the utility model;

[0029] Figure 8 is a second structure schematic view of the check bushing provided by the utility model;

[0030] Figure 9 is a structure schematic view of the main valve cover provided by the utility model;

[0031] Figure 10 is a sectional view of the main valve cover provided by the utility model;

[0032] Figure 11 is a first structure schematic view of the rotary cover provided by the utility model;

[0033] Figure 12 is a structure schematic view of the valve rod provided by the utility model;

[0034] Figure 13 is a second structure schematic view of the rotary cover provided by the utility model;

[0035] Figure 14 is a structure schematic view of the key body provided by the utility model.

[0036] Reference signs:

[0037] 10, valve body assembly; 11, valve body; 111, flow channel; 1110, sealing surface; 1111, outlet end; 1112, second limiting portion; 112, mounting port; 12, main valve cover; 121, through hole; 122, first lock hole; 123, limiting structure;

[0038] 20, check assembly; 21, check valve cover; 211, first limiting portion; 22, check valve disc; 221, sealing portion; 2211, accommodating groove; 222, guide rod portion; 23, check elastic member; 24, check bushing; 241, bushing body; 2410, guide hole; 2411, inner ring bushing; 2412, outer ring bushing; 2413, connecting rod portion; 242, limiting claw; 2421, disc limiting portion; 25, check sealing member;

[0039] 30, valve rod assembly; 31, valve rod; 311, limiting protrusion; 312, plug-in portion; 32, valve core;

[0040] 40, rotating cover; 401, second locking hole; 402, first inserting slot; 403, inserting protrusion;

[0041] 50, latch assembly; 51, magnetic latch; 52, locking elastic member;

[0042] 60, magnetic key; 61, key body; 611, second inserting slot; 612, mounting slot; 62, magnetic member;

[0043] 701, first sealing member; 702, second sealing member. DETAILED DESCRIPTION

[0044] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above-described accompanying drawings.

[0045] In the present application, the terms "comprise", "contain", "have" or any other variant thereof are intended to cover non-exclusive inclusions, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "comprising a" does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0046] In the present application, the term "and / or" is a description of the association relationship between the associated objects, which means that there can be three kinds of relationships. For example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents a "and / or" relationship between the front and rear associated objects.

[0047] In the present application, the terms "connection", "combination", "coupling" and "installation" can be direct connection, combination, coupling or installation, or indirect connection, combination, coupling or installation. Among them, the direct connection means that two parts or components are connected together without setting intermediate parts, and the indirect connection means that two parts or components are connected with at least one intermediate part, and the two parts or components are connected through the intermediate part. In addition, "connection" and "coupling" are not limited to physical or mechanical connection or coupling, and can include electrical connection or coupling.

[0048] In the present utility model, the person skilled in the art will understand that the relative terms (for example, "about", "approximately", "substantially" and the like) used in connection with a quantity or condition are intended to include the stated value and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with a measurement of a particular value, the tolerance caused by manufacturing, assembly, use, and the like associated with a particular value. Such terms should also be considered to disclose a range defined by the absolute values of the two endpoints. The relative terms can refer to a certain percentage (for example, 1%, 5%, 10% or more) of the indicated value plus or minus. The numerical values not using the relative terms should also be disclosed as the specific values with tolerances. In addition, "substantially" when expressing the relative angular positional relationship (for example, substantially parallel, substantially perpendicular), can refer to plus or minus a certain number of degrees (for example, 1 degree, 5 degrees, 10 degrees or more) based on the indicated angle.

[0049] In the present utility model, the person skilled in the art will understand that the functions performed by the components can be performed by one component, multiple components, one part, or multiple parts. Similarly, the functions performed by the parts can also be performed by one part, one component, or a combination of multiple parts.

[0050] In the present utility model, the terms "upper", "lower", "left", "right", "front", "back" and the like are described in the orientation and positional relationship shown in the drawings, and should not be understood as limiting the embodiments of the present utility model. In addition, it should also be understood in the context that when referring to one element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element. It should also be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like not only represent the positive direction, but also can be understood as the side direction. For example, the lower side can include the lower side, the lower left side, the lower right side, the lower front side and the lower back side, etc.

[0051] The utility model provides a check valve, this check valve applies in various pipelines, is used for cutting off or connecting medium flow in pipeline, to reach the purpose that liquid medium is prevented from being stolen and maliciously short of payment when cutting off water supply. Among them, the check valve can be check gate valve, check ball valve, check stop valve or check pressure reducing valve, here does not make specific limitation. For the convenience of description, the following takes check gate valve as an example and through multiple embodiments introduces the specific structure and working principle of the check valve provided by the utility model in detail.

[0052] Embodiment one

[0053] Figure 1 The structure schematic diagram of the check valve provided by the embodiment is shown. Figure 2 The cross-sectional view schematic diagram of the check valve provided by the embodiment is shown. As shown inFigures 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, and thus realizing the closing or opening of the check valve.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] To ensure the sealing between the valve stem 31 and the main valve cover 12, a second sealing member 702 is arranged between the valve stem 31 and the through hole 121. The arrangement of the second sealing member 702 can prevent the liquid medium from leaking between the valve stem 31 and the through hole 121. In the embodiment, the second sealing member 702 is a rubber sealing ring.

[0060] Figure 3 One of the structural schematic diagrams of the check bushing 24 provided by the embodiment is shown. As shown in the figure, Figure 3 and in combination with Figure 2 It is shown that the check valve further includes a check assembly 20, a sealing surface 1110 is formed on the flow passage wall of the flow passage 111 of the valve body 11, the check assembly 20 includes a check valve clack 22 and a check bushing 24, the check bushing 24 is installed at the outlet end 1111 of the flow passage 111, the check bushing 24 includes a bushing body 241 and at least two limiting clamps 242, each limiting clamp 242 is arranged on the bushing body 241 in a circumferential direction of the bushing body 241, and each limiting clamp 242 is arranged to form a limiting space, and the inner side of each limiting clamp 242 is provided with a valve clack limiting part 2421; the check valve clack 22 includes a sealing part 221 capable of sealingly cooperating with the sealing surface 1110, and the sealing part 221 is movably limited in the limiting space, and when the sealing part 221 abuts against the valve clack limiting part 2421, there is a gap L between the sealing part 221 and the bushing body 241.

[0061] The check valve provided by the embodiment can avoid the backflow of the fluid medium downstream of the flow passage 111 by arranging the check assembly 20. By arranging the at least two limiting clamps 242, each limiting clamp 242 can form a limiting space for limiting the sealing part 221 of the check valve clack 22, so that the sealing part 221 moves in the limiting space along the extension direction of the limiting clamp 242, thereby ensuring the stability of the check valve clack 22 during movement and avoiding the eccentricity of the check valve clack 22 during movement. By arranging the valve clack limiting part 2421 on the inner side of the limiting clamp 242, the maximum displacement of the check valve clack 22 can be limited, and when the sealing part 221 abuts against the valve clack limiting part 2421, there is a gap L between the sealing part 221 and the bushing body 241, which can prevent the sealing part 221 from frequently colliding with the bushing body 241, thereby preventing the connection between the bushing body 241 and the limiting clamp 242 from being broken and failing, thereby prolonging the service life of the check bushing 24 and reducing the maintenance cost of the check valve.

[0062] In the embodiment, the number of the limiting clamping claws 242 is three, and the three limiting clamping claws 242 can surround to form a limiting space with a circular cross section, so as to provide a guiding and limiting function for the installation and movement of the check valve disc 22, and effectively avoid the eccentricity of the check valve disc 22, and at the same time, the number of the limiting clamping claws 242 can be reduced, thereby reducing the processing cost of the check valve. Of course, in other embodiments, the number of the limiting clamping claws 242 can also be four, five, six or even more. The embodiment does not limit the specific number of the limiting clamping claws 242, and the designer can adjust it according to the actual processing requirements.

[0063] As shown in Figure 3 , in the embodiment, the valve disc limiting portion 2421 is a limiting step protruding on the inner side of the limiting clamping claw 242, which is simple in structure and convenient to process. The valve disc limiting portion 2421 is equivalent to increasing the thickness of the limiting clamping claw 242, thereby improving the structural strength of the limiting clamping claw 242, so that the limiting clamping claw 242 can effectively share the impact force of the check valve disc 22 on the bushing body 241. Of course, in other embodiments, the valve disc limiting portion 2421 can also be a pin connected to the inner side of the limiting clamping claw 242, which can also achieve the above-mentioned effect.

[0064] As shown in Figure 2 , the check valve assembly 20 further comprises a check valve cover 21, and the check valve cover 21 is connected to the outlet end 1111. The check bushing 24 is limited between the check valve cover 21 and the valve body 11. By providing the check valve cover 21, the quick positioning and stable installation of the check bushing 24 can be achieved.

[0065] Figure 4 The structure schematic diagram of the check valve cover 21 provided by the embodiment is shown. Figure 5 The cross-sectional view of the check valve cover 21 provided by the embodiment is shown. As shown in Figures 4-5 and in combination with Figure 2 , Figure 3 , the inner wall of the check valve cover 21 is formed with a first limiting portion 211, and the flow passage wall of the flow passage 111 is formed with a second limiting portion 1112. The check bushing 24 is limited between the first limiting portion 211 and the second limiting portion 1112. That is, the bushing body 241 of the check bushing 24 abuts against the first limiting portion 211, and the limiting clamping claw 242 of the check bushing 24 abuts against the second limiting portion 1112. By providing the first limiting portion 211 and the second limiting portion 1112, the check bushing 24 can be limited, so as to ensure the stable fixation of the check bushing 24. Among them, the first limiting portion 211 is arranged in the check valve cover 21, so that the check bushing 24 can be partially accommodated in the check valve cover 21 when installed, thereby further improving the stability of the installation of the check bushing 24.

[0066] In the embodiment, the first limiting part 211 is a ring-shaped protrusion protruding from the inner wall of the check valve cover 21, and the second limiting part 1112 is a ring-shaped protrusion protruding from the flow channel wall of the flow channel 111, which is simple in structure and convenient to manufacture.

[0067] Optionally, the check valve cover 21 is threadedly connected to the valve body 11. That is, when the check valve cover 21 is manufactured, external threads are also needed to be manufactured on the check valve cover 21, the first limiting part 211 is arranged as a ring-shaped protrusion on the inner wall of the check valve cover 21, and the thickness of the check valve cover 21 at the position can also be increased, so that the first limiting part 211 is prevented from being deformed when the threads are manufactured.

[0068] Figure 6 A cooperation structure diagram of the check valve disc 22, the check elastic member 23 and the check sealing member 25 is shown. Figure 7 An exploded structure diagram of the check valve disc 22, the check elastic member 23 and the check sealing member 25 is shown. Figure 8 A structure diagram two of the check bushing 24 is shown. Figures 6-8 In combination with the description of the check valve cover 21, the check valve disc 22, the check elastic member 23 and the check sealing member 25, the check bushing 24 is shown. Figure 2 , Figure 3 As shown, the check valve disc 22 further comprises a guide rod part 222 connected to the sealing part 221, the bushing body 241 is provided with a guide hole 2410, and the guide rod part 222 is slidably arranged in the guide hole 2410. By arranging the guide hole 2410 capable of slidably cooperating with the guide rod part 222 on the bushing body 241, the guide hole 2410 can cooperate with the limiting space formed by the limiting clamping jaw 242, so that the stability of the check valve disc 22 during movement is further improved, and the eccentricity is avoided. Compared with the scheme that the guide hole is directly arranged on the check valve cover in the related art, the above-mentioned arrangement can also reduce the machining precision and the machining difficulty of the check valve cover 21, so as to reduce the machining cost to a certain extent.

[0069] It should be noted that in the related art, the guide hole is arranged on the check valve cover made of metal material. The metal material is easily oxidized for a long time in the liquid medium, so that the metal oxide impurities are easily precipitated, the gap between the guide rod part and the guide hole is scaled, and then the guide rod part is stuck in the guide hole and cannot smoothly slide in the guide hole. To solve this problem, in the embodiment, the check valve disc 22 is made of plastic material, and the check bushing 24 is made of plastic material, so that the scaling in the gap between the guide rod part 222 and the guide hole 2410 is effectively prevented, the guide rod part 222 is prevented from being stuck in the guide hole 2410, and the stability and smoothness of the sliding process of the guide rod part 222 relative to the guide hole 2410 are ensured.

[0070] To further ensure the stability of the sliding process of the guide rod part 222 relative to the guide hole 2410, in the embodiment, the guide rod part 222 is in clearance fit with the guide hole 2410 to provide sufficient space for the movement of the guide rod part 222.

[0071] As shown in Figure 6 and Figure 7 , the check valve disc 22 is an integral structure, and the connection between the sealing part 221 and the guide rod part 222 is omitted, thereby saving the connecting member therebetween, reducing the production cost, and improving the structural stability of the check valve disc 22 as a whole. In the embodiment, the check valve disc 22 is formed by injection molding, which has the advantages of high molding precision, good consistency, and low cost.

[0072] As shown in Figure 2 , Figure 6 and Figure 7 , the check valve assembly 20 further comprises a check elastic member 23, which is sleeved on the guide rod part 222, and the two ends of the check elastic member 23 abut against the sealing part 221 and the bushing body 241 respectively. When the pressure at the inlet end of the flow channel 111 is greater than the pressure at the outlet end 1111 thereof, the liquid medium can push the check valve disc 22 to move away from the sealing surface 1110, while compressing the check elastic member 23. At this time, the liquid medium at the inlet end of the flow channel 111 can flow out to the outlet end 1111 of the flow channel 111 through the gap between the sealing part 221 and the sealing surface 1110. When the flow channel 111 is cut off, the check valve disc 22 can be reset under the elastic restoring force of the check elastic member 23, and tightly press the sealing surface 1110 under the elastic force of the check elastic member 23, thereby preventing the backflow of the liquid medium. In the embodiment, the check elastic member 23 is a spring, which is convenient to install and has a relatively low cost.

[0073] Optionally, the check valve assembly 20 further comprises a check sealing member 25, which is sleeved on the sealing part 221 and can be sealingly attached to the sealing surface 1110 to improve the sealing effect between the sealing part 221 and the sealing surface 1110. In the embodiment, the check sealing member 25 is a rubber sealing ring, which has a high sealing effect, is convenient to install, is easy to obtain, and has a relatively low cost.

[0074] Optionally, the side wall of the sealing part 221 is provided with a containing groove 2211 for containing the check sealing member 25. By providing the containing groove 2211, the stable installation of the check sealing member 25 can be achieved, and displacement or falling off of the check sealing member 25 during use can be avoided.

[0075] As shown in Figure 3 and Figure 8As shown, the bush body 241 comprises an inner ring bush 2411, an outer ring bush 2412 and a connecting rod portion 2413, the inner ring bush 2411 is annular, and an inner ring hole of the inner ring bush 2411 forms the guide hole 2410, the outer ring bush 2412 is annularly arranged outside the inner ring bush 2411, the connecting rod portion 2413 is connected to the outer wall of the inner ring bush 2411 and the inner wall of the outer ring bush 2412 at two ends respectively, and the limiting clamping jaw 242 is connected to the outer ring bush 2412. This design can reduce the material of the bush body 241, thereby reducing the material cost. It can be understood that, by arranging the valve clack limiting portion 2421 on the inner side of the limiting clamping jaw 242, when the sealing portion 221 abuts against the valve clack limiting portion 2421, there is a gap L between the sealing portion 221 and the bush body 241, and the connection between the inner ring bush 2411 and the connecting rod portion 2413 and the connection between the outer ring bush 2412 and the connecting rod portion 2413 can also be prevented from being broken, thereby ensuring the check performance of the check valve under the premise of reducing the material cost.

[0076] Optionally, the number of the connecting rod portions 2413 is at least two, and each connecting rod portion 2413 is arranged in a spaced manner along the circumference of the inner ring bush 2411, further ensuring the stable connection between the inner ring bush 2411 and the outer ring bush 2412, and improving the uniformity of the force received by the inner ring bush 2411 and the outer ring bush 2412.

[0077] In the embodiment, the check bush 24 is an integral molding structure, and the connection between the bush body 241 and the limiting clamping jaw 242 is omitted, thereby saving the connecting member therebetween, reducing the production cost, and improving the structural stability of the check bush 24 as a whole. In the embodiment, the check bush 24 is formed by an injection molding process, which has the advantages of high molding precision, good consistency and low cost.

[0078] Figure 9 A structural schematic diagram of the main valve cover 12 provided in the embodiment is shown. Figure 10 A sectional view of the main valve cover 12 provided in the embodiment is shown. Figure 11 A structural schematic diagram of the rotary cover 40 provided in the embodiment is shown. In order to realize the switching of the check valve between the locked state and the unlocked state, as shown in Figures 9-11 and in combination with Figure 2As shown, the check valve further comprises a rotating cover 40 and a latch assembly 50. The rotating cover 40 is rotatably sleeved on the top of the main valve cover 12 and fixedly connected with the top of the valve rod 31. The main valve cover 12 is provided with a first lock hole 122, and the rotating cover 40 is provided with a second lock hole 401 opposite to the first lock hole 122. The latch assembly 50 comprises a magnetic latch 51 and a locking elastic member 52. The magnetic latch 51 is capable of being inserted into the first lock hole 122 and the second lock hole 401 simultaneously under the elastic action of the locking elastic member 52, and capable of compressing the locking elastic member 52 and retracting into the first lock hole 122 or the second lock hole 401 under the external magnetic force, so that the rotating cover 40 can rotate relative to the main valve cover 12 and drive the valve rod 31 to rotate synchronously. That is, under the condition of no external magnetic force, the magnetic latch 51 is inserted into the first lock hole 122 and the second lock hole 401 simultaneously, so that the rotating cover 40 is fixed relative to the main valve cover 12. At this time, the rotating cover 40 cannot rotate relative to the main valve cover 12. When the external magnetic force is applied, the magnetic latch 51 can compress the locking elastic member 52 and retract into the first lock hole 122 or the second lock hole 401, that is, separate from the second lock hole 401 or the first lock hole 122, so as to release the locking 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 rod 31 to rotate synchronously, thereby driving the valve core 32 to open and close the flow channel 111.

[0079] In the embodiment, the locking elastic member 52 is in a compressed state and accommodated in the second lock hole 401, and the two ends of the locking elastic member 52 are connected with the rotating cover 40 and the magnetic latch 51 respectively. Under the elastic action of the locking elastic member 52, a part of the magnetic latch 51 is accommodated in the first lock hole 122, and another part is accommodated in the second lock hole 401, so as to lock the rotating cover 40 and the main valve cover 12 under the condition of no external magnetic force. When the external magnetic force is applied, the magnetic latch 51 can overcome the elastic force of the locking elastic member 52, separate from the first lock hole 122 and retract into the second lock hole 401, so as to release the locking between the rotating cover 40 and the main valve cover 12.

[0080] Figure 12 A structure schematic diagram of the valve rod 31 provided by the embodiment is shown. As shown in the figure, Figure 12 and combined with Figure 11As shown, the inner top of the rotating cover 40 is provided with a first insertion slot 402, and the end of the valve rod 31 away from the valve core 32 is provided with an insertion part 312 which is inserted into the first insertion slot 402, and the cross-sectional shape of the first insertion slot 402 is non-circular, and the shape of the insertion part 312 is adapted to the shape of the first insertion slot 402. This design can ensure that the rotating cover 40 can drive the valve rod 31 to rotate synchronously when the rotating cover 40 rotates, avoiding relative rotation between the two. It should be explained that the non-circular shape can be a polygon such as a triangle, a rectangle, a hexagon, or a regular pattern formed by straight lines and curves, or an irregular pattern formed by straight lines and curves, or a regular or irregular pattern formed by curves, which is not limited in the embodiment.

[0081] As shown in the drawings, Figure 2 The check valve further includes a magnetic key 60 which is adapted to the rotating cover 40 and can provide external magnetic force for the magnetic latch 51. When it is needed 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 for the magnetic latch 51, so that the magnetic latch 51 is separated from the first lock hole 122 and retracted into the second lock hole 401; at this time, the operator can rotate the rotating cover 40 to drive the valve rod 31 to rotate, so that the valve core 32 opens and closes the flow passage 111.

[0082] Figure 13 A second structural schematic diagram of the rotating cover 40 provided in the embodiment is shown. Figure 14 A structural schematic diagram of the key body 61 provided in the embodiment is shown. As shown in the drawings, Figures 13-14 and in combination with Figure 2 As shown, the magnetic key 60 includes a key body 61 and a magnetic part 62, the key body 61 is provided with a second insertion slot 611, the top of the rotating cover 40 is provided with an insertion protrusion 403 which is inserted into the second insertion slot 611, and the magnetic part 62 is embedded in the key body 61, and the magnetic part 62 is magnetically attracted to the magnetic latch 51. In the embodiment, the number of the magnetic parts 62 is equal to the number of the magnetic latches 51, and when the magnetic part 62 is opposite to the magnetic latch 51, an attractive force is generated between the two to compress the locking elastic part 52 and separate the magnetic latch 51 from the first lock hole 122.

[0083] In order to stably install the magnetic part 62, the key body 61 is further provided with a mounting groove 612 for accommodating the magnetic part 62, and the magnetic part 62 is adhered in the mounting groove 612, which is stable in connection and convenient to operate.

[0084] The working principle of the check valve will be described below. Figures 1-14 The working principle of the check valve will be described below.

[0085] 1) When switching 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 them into the insertion fit, and the magnetic latch 51 can overcome the elastic force of the locking elastic member 52 under the magnetic attraction of the magnetic member 62, so as to be separated from the first lock hole 122 and retracted into the second lock hole 401. At this time, the operator rotates the magnetic key 60 to drive the rotating cover 40 to rotate, thereby driving the valve rod 31 to rotate synchronously, and further controlling the opening or closing of the check valve.

[0086] 2) When switching from the unlocked state to the locked state, the operator can remove the magnetic key 60 from the rotating cover 40, and the magnetic attraction of the magnetic member 62 to the magnetic latch 51 disappears. The magnetic latch 51 can be reset under the elastic force of the locking elastic member 52 to move from the second lock hole 401 to the first lock hole 122. At this time, the magnetic latch 51 can lock the rotating cover 40 and the main valve cover 12, and the rotating cover 40 cannot rotate relative to the main valve cover 12.

[0087] 3) When the flow channel 111 is connected, the pressure at the inlet end of the flow channel 111 is greater than the pressure at the outlet end 1111, and the liquid medium can push the check valve disc 22 to move away from the sealing surface 1110 and compress the check elastic member 23. At this time, the liquid medium at the inlet end of the flow channel 111 can flow out to the outlet end 1111 of the flow channel 111 through the gap between the sealing part 221 and the sealing surface 1110; when the flow channel 111 is cut off, the check valve disc 22 can be reset under the elastic restoring force of the check elastic member 23, and the sealing surface 1110 can be pressed tightly under the elastic force of the check elastic member 23, thereby realizing the check function of the check valve.

[0088] Example Two

[0089] This embodiment provides a check valve, which has substantially the same specific structure as that in Example One, except that the setting position of the latch assembly 50 is different.

[0090] Specifically, referring to Figure 2In the embodiment, the locking elastic member 52 is in a compressed state and is accommodated in the first lock hole 122, and two ends of the locking elastic member 52 are connected with the main valve cover 12 and the magnetic plug 51 respectively. The magnetic plug 51 is accommodated in the first lock hole 122 and the second lock hole 401 under the elastic action of the locking elastic member 52, so as to lock the rotary cover 40 and the main valve cover 12 without external magnetic force. When external magnetic repulsion force is applied, the magnetic plug 51 can overcome the elastic force of the locking elastic member 52, and is separated from the second lock hole 401 and retracts into the first lock hole 122, so as to unlock the rotary cover 40 and the main valve cover 12. It can be understood that, in the embodiment, the magnetic repulsion force exists between the magnetic member 62 and the magnetic plug 51.

[0091] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the above-mentioned embodiments do not limit the utility model in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.

Claims

1. A check valve, characterized by, The valve body (11) is internally provided with a flow channel (111) and a sealing surface (1110) formed on the flow channel wall of the flow channel (111); the check assembly (20) comprises a check valve clack (22) and a check sleeve (24), the check sleeve (24) is installed at the outlet end (1111) of the flow channel (111), the check sleeve (24) comprises a sleeve body (241) and at least two limiting clamps (242), each of the limiting clamps (242) is arranged on the sleeve body (241) in a circumferential direction and surrounds to form a limiting space, and the inner side of each of the limiting clamps (242) is provided with a valve clack limiting part (2421); the check valve clack (22) comprises a sealing part (221) capable of sealingly cooperating with the sealing surface (1110), and the sealing part (221) is movably limited in the limiting space, and when the sealing part (221) abuts against the valve clack limiting part (2421), there is a gap L between the sealing part (221) and the sleeve body (241). The valve clack limiting part (2421) is a limiting step protruding on the inner side of the limiting clamp (242). The check valve clack (22) further comprises a guide rod part (222) connected with the sealing part (221), and the sleeve body (241) is provided with a guide hole (2410), and the guide rod part (222) is slidably arranged in the guide hole (2410).

2. The check valve of claim 1, wherein The guide rod part (222) and the guide hole (2410) are in clearance fit.

3. The check valve of claim 1, wherein The sleeve body (241) comprises an inner ring sleeve (2411), an outer ring sleeve (2412) and a connecting rod part (2413), the inner ring sleeve (2411) is annular, the inner ring hole of the inner ring sleeve (2411) forms the guide hole (2410), the outer ring sleeve (2412) is annularly arranged outside the inner ring sleeve (2411), the connecting rod part (2413) is connected with the outer wall of the inner ring sleeve (2411) and the inner wall of the outer ring sleeve (2412) at two ends respectively, and the limiting clamp (242) is connected to the outer ring sleeve (2412).

4. The check valve of claim 3, wherein The number of the connecting rod part (2413) is at least two, and each of the connecting rod parts (2413) is arranged in a circumferential direction of the inner ring sleeve (2411).

5. The check valve of claim 3, wherein The check sleeve (24) is made of plastic material; and / or the check valve clack (22) is made of plastic material.

6. The check valve of claim 5, wherein, The check assembly (20) further comprises a check elastic member (23), and two ends of the check elastic member (23) abut against the sealing part (221) and the sleeve body (241) respectively.

7. The check valve of claim 1, wherein ​ 8. The check valve of claim 1, wherein ​ 9. The check valve of claim 1, wherein The check valve cover (21) is connected to the outlet end (1111), and an inner wall of the check valve cover (21) is formed with a first limiting part (211), a flow passage wall of the flow passage (111) is formed with a second limiting part (1112), and the check valve sleeve (24) is limited between the first limiting part (211) and the second limiting part (1112).

10. The check valve of any one of claims 1-9, wherein, The check valve is a check gate valve, a check ball valve, a check stop valve or a check pressure reducing valve.

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