Check valve and pipeline system

Abstract

The utility model belongs to the technical field of valve bodies, and discloses a check valve and a pipeline system.The check valve comprises a valve body and a valve clack, the valve body is connected with a liquid inlet pipe and a liquid outlet pipe, an inner cavity of the valve body forms a valve cavity, the liquid outlet pipe is communicated with the valve cavity all the time, the valve clack is arranged in the valve cavity, one of the valve clack and the liquid inlet pipe is provided with a buckle, and the other one is provided with a clamping groove. The valve clack can move in the preset direction, so that the buckle can be selectively clamped with the clamping groove to enable the valve clack to be located at the closing position or separated from the clamping groove to enable the valve clack to be located at the opening position; when the valve clack is located at the closing position, the liquid inlet pipe is disconnected from the valve cavity; when the valve clack is located at the opening position, the liquid inlet pipe communicates with the valve cavity. According to the check valve and the pipeline system, the buckle and the clamping groove are clamped and locked to enable the valve clack and the liquid inlet pipe to be tightly fixed, the valve clack and the liquid inlet pipe cannot move under the impact action of media, the media cannot enter the liquid inlet pipe, the media can be effectively prevented from flowing back, and therefore the safety of the whole conveying system is protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve body technical field especially relates to check valve and pipeline system. BACKGROUND

[0002] Natural gas as a kind of clean, efficient energy, occupies the pivotal position in modern city energy supply. In the natural gas conveying process, part of natural gas will flow in reverse, and natural gas backflow is directly related to the stability of energy supply and public safety.

[0003] In the natural gas pipeline system, check valve as a kind of key valve device, plays an important role in preventing natural gas backflow. The traditional check valve is opened and closed by using spring to push valve clack, but deviation may occur when valve clack closes valve, leading to valve sealing not tight, cannot effectively prevent natural gas backflow, which may affect the safety of the whole natural gas conveying system. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of check valve and pipeline system, can effectively prevent natural gas backflow, protect the safety of the whole conveying system.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Check valve, comprising:

[0007] Valve body, the valve body is connected with the liquid inlet pipe and the liquid outlet pipe relatively arranged along preset direction, the inner cavity of the valve body forms valve cavity, the liquid outlet pipe is always communicated with the valve cavity;

[0008] Valve clack, be in the valve cavity, the valve clack and the liquid inlet pipe one are equipped with buckle, another is equipped with clamping groove, the valve clack can move along preset direction, make the buckle can selectively with The clamping groove is clamped to make the valve clack be in closed position, or separate from the clamping groove to make the valve clack be in open position;

[0009] The liquid inlet pipe is disconnected with the valve cavity when the valve clack is located in the closed position;The liquid inlet pipe is communicated with the valve cavity when the valve clack is located in the open position.

[0010] Optionally, the liquid inlet pipe includes flow control piece, one of the buckle or the clamping groove is equipped in the flow control piece, the inner circumferential surface radius of the flow control piece gradually decreases from the direction of the liquid inlet pipe to the valve clack.

[0011] Optionally, one end of the flow control member facing the valve disc is provided with a groove, and the outlet end of the liquid inlet pipe penetrates to the groove bottom wall; the valve disc is provided with a blocking part on the side facing the flow control member; when the valve disc is in the closed position, the blocking part presses against the groove bottom wall to block the outlet end of the liquid inlet pipe.

[0012] Alternatively, one end of the valve disc facing the flow control member is provided with a groove, and the flow control member is provided with a blocking part on the side facing the valve disc, and the outlet end of the liquid inlet pipe penetrates to the blocking part; when the valve disc is in the closed position, the groove bottom wall presses against the blocking part to block the outlet end of the liquid inlet pipe.

[0013] Optionally, the check valve further comprises:

[0014] a support located in the valve cavity and fixed to the valve body;

[0015] a connecting piece, one end of which is fixedly connected to the valve disc, and the other end is slidingly connected to the support in a predetermined direction; or one end of the connecting piece is slidingly connected to the valve disc in a predetermined direction, and the other end is fixedly connected to the support;

[0016] The predetermined direction is from the liquid inlet pipe to the liquid outlet pipe.

[0017] Optionally, the check valve further comprises an elastic member, which is sleeved outside the connecting piece, one end of the elastic member is fixedly connected or abuts against the valve disc, and the other end is fixedly connected or abuts against the support, and the elastic member is used to make the valve disc have a tendency to move from the open position to the closed position.

[0018] Optionally, the support comprises a support frame mounted on the valve body, and an abutting plate mounted on the side of the support frame facing the valve disc, the elastic member is fixedly connected or abuts against the abutting plate, and the contact area of the abutting plate and the support frame is greater than the contact area of the elastic member and the abutting plate.

[0019] Optionally, the valve disc is provided with a weight-reducing groove on the side facing the support.

[0020] A pipeline system comprising:

[0021] the check valve;

[0022] an input pipe for conveying medium to the valve cavity;

[0023] an output pipe for outputting the medium in the valve cavity.

[0024] Optionally, the input pipe comprises a pipe joint, a limiting portion is arranged on the outer circumferential wall of the pipe joint, the pipe joint is inserted into the liquid inlet pipe along the axial direction of the pipe joint, the liquid inlet pipe abuts against the limiting portion along the axial direction of the liquid inlet pipe, and the pipe joint and the liquid inlet pipe are connected through the fastener extending along the radial direction of the input pipe.

[0025] Optionally, the output pipe comprises a pipe joint, a limiting portion is arranged on the outer circumferential wall of the pipe joint, the pipe joint is inserted into the liquid outlet pipe along the axial direction of the pipe joint, the liquid outlet pipe abuts against the limiting portion along the axial direction of the liquid outlet pipe, and the pipe joint and the liquid outlet pipe are connected through the fastener extending along the radial direction of the input pipe.

[0026] Optionally, one of the liquid inlet pipe and the pipe joint is provided with a limiting groove extending along the circumferential direction and a plug-in groove extending along the axial direction, one end of the limiting groove extends to the inner wall of the plug-in groove, the other is provided with a protruding portion, the protruding portion can be inserted into the plug-in groove along the axial direction of the pipe joint to abut against the groove bottom wall of the plug-in groove, and the pipe joint can rotate relative to the liquid inlet pipe in the circumferential direction, so that the protruding portion enters the limiting groove to abut against the groove bottom wall of the limiting groove.

[0027] Optionally, one of the liquid inlet pipe and the pipe joint is provided with a limiting groove extending along the circumferential direction and a plug-in groove extending along the axial direction, one end of the limiting groove extends to the inner wall of the plug-in groove, the other is provided with a protruding portion, the protruding portion can be inserted into the plug-in groove along the axial direction of the pipe joint to abut against the groove bottom wall of the plug-in groove, and the pipe joint can rotate relative to the liquid inlet pipe in the circumferential direction, so that the protruding portion enters the limiting groove to abut against the groove bottom wall of the limiting groove.

[0028] The utility model discloses beneficial effects:

[0029] The check valve and the pipeline system provided by the utility model, under normal circumstances, the valve clack is located at the closed position, the liquid inlet pipe is disconnected with the valve cavity, when it is needed to fill medium into the valve body, the medium pressure in the liquid inlet pipe is larger, under the high pressure, the medium can push the valve clack to move from the closed position to the open position to overcome the resistance between the buckle and the clamping groove, so that the buckle and the clamping groove are separated from each other, a channel is formed between the valve clack and the liquid inlet pipe, the medium in the liquid inlet pipe can enter the valve cavity, and then the medium can flow out from the valve cavity through the liquid outlet pipe, and the medium can smoothly pass through the valve body.

[0030] When the medium appears backflow, the medium pressure in the outlet pipe is higher than that in the inlet pipe, the medium in the outlet pipe reversely pushes the valve disc to move from the open position to the closed position, when the buckle is locked with the clamping groove, the valve disc and the inlet pipe are tightly fixed together, under the impact of the medium, the valve disc and the inlet pipe cannot move, the inlet pipe is disconnected with the valve cavity, the medium cannot enter the inlet pipe, the backflow of the medium can be effectively prevented, and the safety of the whole conveying system is protected. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a first structural schematic view of a check valve and a pipeline system provided by the embodiment of the utility model;

[0032] Figure 2 is a second structural schematic view of a check valve and a pipeline system provided by the embodiment of the utility model;

[0033] Figure 3 is a schematic view of the structure in the valve cavity of a check valve provided by the embodiment of the utility model;

[0034] Figure 4 is a structural schematic view of a pipeline joint provided by the embodiment of the utility model.

[0035] In the figure: 1, valve body; 11, valve disc; 111, connecting part; 12, clamping groove; 13, flow control piece; 14, buckle; 15, locking part; 16, inlet pipe; 17, outlet pipe; 18, protruding part; 19, threaded hole; 21, support frame; 22, base; 23, support column; 24, abutting plate; 3, connecting piece; 4, elastic piece; 5, input pipe; 51, pipeline joint; 52, plug-in slot; 53, limiting slot; 54, connecting hole. DETAILED DESCRIPTION

[0036] The utility model will be further explained in detail in combination with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0037] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0038] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that horizontal height of first feature is less than second feature.

[0039] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and "radial" refer to the orientation or position shown in the drawings, which are for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0040] As shown in Figures 1-4 The utility model discloses an embodiment provides a check valve, including valve body 1 and valve clack 11, valve body 1 is connected with the liquid inlet pipe 16 and the liquid outlet pipe 17 who are relatively arranged along the preset direction, and the inner chamber of valve body 1 forms the valve chamber, and the liquid outlet pipe 17 is always communicated with the valve chamber, and the valve clack 11 is located in the valve chamber, and the valve clack 11 and the liquid inlet pipe 16 are equipped with buckle 14, and the other is equipped with clamping groove 12, and the valve clack 11 can move along the preset direction, so that buckle 14 can selectively with clamping groove 12 joint to make the valve clack 11 be in closed position, or separate from clamping groove 12 to make the valve clack 11 be in open position, when the valve clack 11 is in closed position, the liquid inlet pipe 16 is disconnected with the valve chamber, when the valve clack 11 is in open position, the liquid inlet pipe 16 is communicated with the valve chamber.

[0041] Under normal circumstances, the valve clack 11 is in closed position, and the liquid inlet pipe 16 is disconnected with the valve chamber, when needing to fill medium into the valve body 1, the medium pressure in the liquid inlet pipe 16 is larger, under the high pressure, the medium can push the valve clack 11 to move from closed position to open position to overcome the resistance between buckle 14 and clamping groove 12, make buckle 14 and clamping groove 12 separate from each other, form the passageway between the valve clack 11 and the liquid inlet pipe 16, and the medium in the liquid inlet pipe 16 can enter the valve chamber, then flow out from the valve chamber through the liquid outlet pipe 17, and the medium can smoothly pass through the valve body 1.

[0042] When the medium appears backflow, the medium pressure in the outlet pipe 17 is higher than that in the inlet pipe 16, the medium in the outlet pipe 17 reversely pushes the valve disc 11 to move from the open position to the closed position, when the buckle 14 is locked with the clamping groove 12, the valve disc 11 and the inlet pipe 16 are tightly fixed together, under the impact of the medium, the valve disc 11 and the inlet pipe 16 will not move, the inlet pipe 16 is disconnected with the valve cavity, the medium cannot enter the inlet pipe 16, which can effectively prevent the medium from backflowing, thereby protecting the safety of the whole conveying system.

[0043] Exemplarily, the valve disc 11 is provided with the clamping groove 12, and the inlet pipe 16 is provided with the buckle 14. In other embodiments, the valve disc 11 is provided with the buckle 14, and the inlet pipe 16 is provided with the clamping groove 12.

[0044] As shown in the drawings, Figure 3 The buckle 14 is provided with a locking part 15, specifically, the locking part 15 is a contraction roller, which is rotationally connected to the buckle 14. The clamping of the contraction roller and the clamping groove 12 can form a one-way locking structure, when the medium flows forward, the contraction roller rotates under the action of pressure to separate from the clamping groove 12, so that the valve disc 11 and the inlet pipe 16 are separated, and the valve is opened; when the medium flows reversely, the buckle 14 is clamped with the clamping groove 12, the contraction roller is tightly engaged with the clamping groove 12 under the action of pressure, so that the valve disc 11 and the inlet pipe 16 are tightly fixed, the valve is closed, and the medium backflow path is effectively blocked. By providing the locking part 15 on the buckle 14, the tightness of the valve disc 11 and the valve body 1 can be further improved.

[0045] Further, the inlet pipe 16 comprises a flow control piece 13, one of the buckle 14 or the clamping groove 12 is arranged on the flow control piece 13, and the radius of the inner circumferential surface of the flow control piece 13 gradually decreases from the inlet pipe 16 to the valve disc 11.

[0046] As shown in the drawings, Figure 2 , 3 The design of the flow control piece 13 in the shape of a circular truncated cone can make the medium flowing forward more concentrated and the flow rate larger when passing through the flow control piece 13, reduce the turbulence phenomenon of the medium, and help the medium to quickly and smoothly push the valve disc 11 to open the flow control piece 13, so that the medium can efficiently pass through the valve body 1. The flow control piece 13 can guide the medium to flow in a predetermined direction, avoid turbulence phenomenon of the medium in the valve cavity, and effectively ensure the stability and reliability of the check valve.

[0047] Further, as shown in the drawings, Figure 3 The end of the flow control piece 13 facing the valve disc 11 is provided with a groove, the outlet end of the inlet pipe 16 penetrates to the groove bottom wall of the groove, and the side of the valve disc 11 facing the flow control piece 13 is provided with a blocking part, when the valve disc 11 is in the closed position, the blocking part abuts against the groove bottom wall of the groove to block the outlet end of the inlet pipe 16.

[0048] By pressing the outer peripheral wall of the sealing part against the inner wall of the groove, the outlet end of the liquid inlet pipe 16 can be effectively sealed, ensuring that the medium will not backflow due to gaps during the backflow process.

[0049] In other embodiments, a groove may be provided at one end of the valve disc 11 facing the flow control element 13, and a blocking part may be provided on the side of the flow control element 13 facing the valve disc 11. The outlet end of the liquid inlet pipe 16 extends through the blocking part. When the valve disc 11 is in the closed position, the bottom wall of the groove presses against the blocking part to block the outlet end of the liquid inlet pipe 16.

[0050] Furthermore, the check valve also includes a support and a connector 3. The support is located inside the valve cavity and fixed to the valve body 1. One end of the connector 3 is fixedly connected to the valve disc 11, and the other end is slidably connected to the support in a preset direction, which is from the inlet pipe 16 to the outlet pipe 17.

[0051] like Figure 3 As shown, when the medium flows forward, it pushes the valve disc 11 to move, causing the locking part 15 to separate from the slot 12. The valve disc 11 drives the connecting piece 3 to slide within the support, separating the valve disc 11 from the flow control element 13, allowing the medium to flow smoothly into the valve chamber. When the medium flows backward, it pushes the valve disc 11 towards the flow control element 13. The valve disc 11 drives the connecting piece 3 to slide backward within the support, causing the valve disc 11 to block the outlet end of the inlet pipe 16. At the same time, the buckle 14 and the locking part 15 lock the slot 12 in place.

[0052] The connector 3 is slidably connected to the support, and the support guides the connector 3 so that the valve disc 11 will not deviate during movement, ensuring that the valve disc 11 can accurately open or close the outlet end of the liquid inlet pipe 16, and avoiding poor sealing due to movement error.

[0053] In other embodiments, one end of the connector 3 can also be slidably connected to the valve disc 11 along a preset direction, and the other end can be fixedly connected to the support. When the medium flows in the forward direction, the medium pushes the valve disc 11 to move, and the valve disc 11 slides relative to the connector 3, so that the valve disc 11 separates from the flow control element 13 under the guidance of the connector 3, ensuring that the path does not deviate. It should be noted that the connector 3 will not block the sealing part from sealing the outlet end of the liquid inlet pipe 16 during the sliding process.

[0054] Furthermore, the check valve also includes an elastic element 4, which is sleeved outside the connecting member 3. One end of the elastic element 4 is fixedly connected to the valve disc 11, and the other end is fixedly connected to the support member. The elastic element 4 is used to make the valve disc 11 have a tendency to move from the open position to the closed position.

[0055] The elastic element 4 is sleeved outside the connecting element 3. The connecting element 3 can restrict the direction of movement of the elastic element 4 during the extension and retraction process, ensuring that the elastic element 4 can always extend and retract along the axial direction of the valve disc 11, thus ensuring the accuracy of the valve disc 11's action.

[0056] Specifically, the elastic element 4 is a compression spring. During the process of not filling with medium, the elastic element 4 resets under the action of its own elastic potential energy and can apply a force to the valve disc 11 so that the valve disc 11 blocks the outlet end of the liquid inlet pipe 16, that is, the valve disc 11 is in the closed position.

[0057] During normal medium flow, the medium pushes valve disc 11 from the closed position to the open position, causing it to overcome the elastic force of elastic element 4. Valve disc 11 separates from flow control element 13, and valve disc 11 pushes connecting element 3 to move. During this process, valve disc 11 also pushes elastic element 4 to compress and deform, generating a certain elastic potential energy. When the medium stops flowing or backflow occurs, the medium impacts valve disc 11, causing it to move towards flow control element 13. Elastic element 4 resets under its own elastic potential energy, further pushing valve disc 11 to move, enabling valve disc 11 to quickly block the outlet end of inlet pipe 16 and promptly prevent medium backflow.

[0058] In other embodiments, the elastic member 4 may abut one end against the valve disc 11 and the other end against the support member.

[0059] Furthermore, such as Figure 3 As shown, the valve disc 11 has a weight-reducing groove on the side facing the support. By creating a weight-reducing groove on the valve disc 11, not only can materials be saved and costs reduced, but the weight of the valve disc 11 can also be reduced, making it easier for the medium to push the valve disc 11 to move.

[0060] Furthermore, the bottom wall of the weight-reducing groove is provided with a connecting portion 111, one end of the connecting member 3 passes through the connecting portion 111, and one end of the elastic member 4 is fixedly connected to the connecting portion 111, which facilitates the installation of the connecting member 3 and the elastic member 4. In other embodiments, the elastic member 4 may also abut against the connecting portion 111.

[0061] Furthermore, the support includes a support frame 21 installed on the valve body 1, and a stop plate 24 installed on the side of the support frame 21 facing the valve disc 11. The elastic member 4 is fixedly connected to the stop plate 24, and the contact area between the stop plate 24 and the support frame 21 is greater than the contact area between the elastic member 4 and the stop plate 24.

[0062] like Figure 3 As shown, the abutment plate 24 is used to support the elastic element 4. It can transmit the force applied by the elastic element 4 to the abutment plate 24 to the valve body 1 through the support frame 21. The abutment plate 24 adopts a circular plate structure, with a large force-bearing area, uniform force distribution, and convenient force transmission.

[0063] In other embodiments, the elastic element 4 may also abut against the abutment plate 24.

[0064] Further, the support further comprises a base 22 and a support column 23, the base 22 is mounted on the support frame 21, the support column 23 is connected to the abutting plate 24 along the axial direction of the connecting piece 3 and passes through the support frame 21 and the base 22, and one end of the connecting piece 3 is connected to the inner wall of the support column 23 in a sliding mode.

[0065] The base 22 is mounted on the support frame 21, the base 22 increases the local area of the support frame 21, facilitates the abutting plate 24 to transmit the force applied by the elastic member 4 to the base 22, and also facilitates the support column 23 to pass through the support frame 21, ensures that the support column 23 can be stably mounted on the support frame 21, the support column 23 can provide support for the abutting plate 24 and the connecting piece 3, facilitates the force transmission, and greatly improves the working stability of the check valve.

[0066] As shown in Figure 1 , 2 , 4, the embodiment of the utility model provides a pipeline system, including input pipe 5, output pipe and above-mentioned check valve, input pipe 5 is used to transport medium to valve cavity, and output pipe is used to output the medium in valve cavity.

[0067] Further, the input pipe 5 includes a pipeline joint 51, the outer peripheral wall of the pipeline joint 51 protrudes a limiting portion, the pipeline joint 51 is inserted into the liquid inlet pipe 16 along the axial direction of the pipeline joint 51 so that the liquid inlet pipe 16 abuts against the limiting portion along the axial direction of the liquid inlet pipe 16, and the pipeline joint 51 and the liquid inlet pipe 16 are connected by a fastener extending radially along the input pipe 5.

[0068] As shown in Figure 4 , the pipeline joint 51 is provided with a connecting hole 54, and the liquid inlet pipe 16 is provided with a threaded hole 19, and the fastener is screwed into the threaded hole 19 of the liquid inlet pipe 16 after passing through the connecting hole 54 of the pipeline joint 51.

[0069] First, the pipeline joint 51 is axially inserted into the liquid inlet pipe 16, and the end surface of the liquid inlet pipe 16 abuts against the limiting portion, and then the fastener is screwed into the liquid inlet pipe 16. The axial insertion and fastener fixing connection can improve the connection stability of the pipeline joint 51 and the liquid inlet pipe 16.

[0070] Similarly, the output pipe includes a pipeline joint 51, the outer peripheral wall of the pipeline joint 51 protrudes a limiting portion, the pipeline joint 51 is inserted into the liquid outlet pipe 17 along the axial direction of the pipeline joint 51 so that the liquid outlet pipe 17 abuts against the limiting portion along the axial direction of the liquid outlet pipe 17, and the pipeline joint 51 and the liquid outlet pipe 17 are connected by a fastener extending radially along the input pipe 5.

[0071] The pipeline joint 51 is provided with a connecting hole 54, and the liquid outlet pipe 17 is provided with a threaded hole 19, and the fastener is screwed into the threaded hole 19 of the liquid outlet pipe 17 after passing through the connecting hole 54 of the pipeline joint 51.

[0072] The pipeline joint 51 is axially inserted into the liquid outlet pipe 17, the end surface of the liquid outlet pipe 17 abuts against the limiting portion, and then is screwed to the liquid outlet pipe 17 by the fastener, so that the connection stability of the pipeline joint 51 and the liquid outlet pipe 17 is improved.

[0073] Specifically, the fastener is a bolt.

[0074] Further, one of the liquid inlet pipe 16 and the pipeline joint 51 is provided with a limiting groove 53 extending along the circumferential direction thereof and a plug-in groove 52 extending along the axial direction thereof, one end of the limiting groove 53 extending to the inner wall of the plug-in groove 52, and the other is provided with the protruding portion 18, the protruding portion 18 being capable of being inserted into the plug-in groove 52 along the axial direction of the pipeline joint 51 to abut against the groove bottom wall of the plug-in groove 52, and the pipeline joint 51 being capable of rotating relative to the liquid inlet pipe 16 in the circumferential direction so that the protruding portion 18 enters the limiting groove 53 to abut against the groove bottom wall of the limiting groove 53.

[0075] Exemplarily, as shown in Figure 4 the pipeline joint 51 is provided with the limiting groove 53 extending along the circumferential direction thereof and the plug-in groove 52 extending along the axial direction thereof, the liquid inlet pipe 16 is provided with the protruding portion 18, the pipeline joint 51 is axially inserted into the liquid inlet pipe 16, the protruding portion 18 is inserted into the plug-in groove 52 and abuts against the groove bottom wall of the plug-in groove 52, and then the pipeline joint 51 is rotated so that the protruding portion 18 enters the limiting groove 53 and abuts against the groove bottom wall of the limiting groove 53.

[0076] By adopting the axial insertion and rotational clamping mode, the connecting hole 54 of the pipeline joint 51 and the threaded hole 19 of the liquid inlet pipe 16 are aligned, the difficulty of alignment in the installation process is reduced, and the installation efficiency is improved. On the basis of the axial insertion and rotational clamping, the fastener is further fastened to improve the connection stability of the pipeline joint 51 and the liquid inlet pipe 16. By adopting this mode, the pipeline joint 51 and the liquid inlet pipe 16 are limited in rotation in the circumferential direction as well as in the axial direction, the connection of the check valve and the liquid inlet pipe 16 is more stable, the impact force of the high-pressure medium in the pipeline and the vibration of the pipeline can be better resisted, and the risk of medium leakage caused by loose connection is reduced.

[0077] In other embodiments, the liquid inlet pipe 16 is provided with the limiting groove 53 extending along the circumferential direction thereof and the plug-in groove 52 extending along the axial direction thereof, and the pipeline joint 51 is provided with the protruding portion 18.

[0078] Similarly, one of the liquid outlet pipe 17 and the pipe joint 51 is provided with a limiting slot 53 extending along the circumference of itself and a plug-in slot 52 extending along the axial direction of itself, one end of the limiting slot 53 extends to the inner wall of the plug-in slot 52, and the other is provided with a protruding part 18, the protruding part 18 can be inserted into the plug-in slot 52 along the axial direction of the pipe joint 51 to abut against the slot bottom wall of the plug-in slot 52, and the pipe joint 51 can rotate relative to the liquid outlet pipe 17 in the circumferential direction, so that the protruding part 18 enters the limiting slot 53 to abut against the slot bottom wall of the limiting slot 53.

[0079] Exemplarily, as shown in the drawings, Figure 4 The pipe joint 51 is provided with a limiting slot 53 extending along the circumference of itself and a plug-in slot 52 extending along the axial direction of itself, and the liquid outlet pipe 17 is provided with a protruding part 18, the pipe joint 51 is axially inserted into the liquid outlet pipe 17, and after the protruding part 18 is inserted into the plug-in slot 52 and abuts against the slot bottom wall of the plug-in slot 52, the pipe joint 51 is rotated to make the protruding part 18 enter the limiting slot 53 and abut against the slot bottom wall of the limiting slot 53.

[0080] The pipe joint 51 is respectively axially inserted into the liquid inlet pipe 16 and the liquid outlet pipe 17, and then rotated and clamped, and finally connected through fasteners, which greatly improves the connection stability of the check valve and the pipe and reduces the risk of medium leakage.

[0081] In other embodiments, the liquid outlet pipe 17 is provided with a limiting slot 53 extending along the circumference of itself and a plug-in slot 52 extending along the axial direction of itself, and the pipe joint 51 is provided with a protruding part 18.

[0082] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A check valve characterized by, The utility model relates to a valve, comprising: a valve body (1) connected with an inlet pipe (16) and an outlet pipe (17) oppositely arranged along a preset direction, an inner cavity of the valve body (1) forming a valve cavity, the outlet pipe (17) always communicating with the valve cavity; a valve disc (11) arranged in the valve cavity, the valve disc (11) and the inlet pipe (16) being provided with a buckle (14) and a clamping groove (12) respectively, the valve disc (11) being movable along a preset direction so that the buckle (14) can selectively engage with the clamping groove (12) to make the valve disc (11) in a closed position or disengage from the clamping groove (12) to make the valve disc (11) in an open position; when the valve disc (11) is in the closed position, the inlet pipe (16) is disconnected with the valve cavity; when the valve disc (11) is in the open position, the inlet pipe (16) communicates with the valve cavity.

2. The check valve of claim 1, wherein The inlet pipe (16) comprises a flow control member (13), one of the buckle (14) or the clamping groove (12) being arranged on the flow control member (13), and the inner circumferential surface of the flow control member (13) gradually decreases in radius from the inlet pipe (16) to the valve disc (11).

3. The check valve of claim 2, wherein The end of the flow control member (13) facing the valve disc (11) is provided with a groove, and the outlet end of the inlet pipe (16) penetrates to the groove bottom wall; the side of the valve disc (11) facing the flow control member (13) is provided with a blocking part; when the valve disc (11) is in the closed position, the blocking part presses against the groove bottom wall to block the outlet end of the inlet pipe (16); alternatively, the end of the valve disc (11) facing the flow control member (13) is provided with a groove, the side of the flow control member (13) facing the valve disc (11) is provided with a blocking part, and the outlet end of the inlet pipe (16) penetrates to the blocking part; when the valve disc (11) is in the closed position, the groove bottom wall presses against the blocking part to block the outlet end of the inlet pipe (16).

4. The check valve of claim 3, wherein The check valve further comprises: a support arranged in the valve cavity and fixed to the valve body (1); a connecting member (3) having one end fixedly connected to the valve disc (11) and the other end slidingly connected to the support along a preset direction; or having one end slidingly connected to the valve disc (11) along a preset direction and the other end fixedly connected to the support; the preset direction being from the inlet pipe (16) to the outlet pipe (17).

5. The check valve of claim 4, wherein The check valve further comprises a resilient member (4) sleeved outside the connecting member (3), one end of the resilient member (4) being fixedly connected to or abutting against the valve disc (11) and the other end being fixedly connected to or abutting against the support, the resilient member (4) being used to make the valve disc (11) have a tendency to move from the open position to the closed position.

6. The check valve of claim 5, wherein The support comprises a support frame (21) mounted on the valve body (1) and a stop plate (24) mounted on the side of the support frame (21) facing the valve disc (11), the elastic member (4) is fixedly connected or abuts against the stop plate (24), and the contact area of the stop plate (24) and the support frame (21) is larger than the contact area of the elastic member (4) and the stop plate (24).

7. The check valve of claim 5, wherein The side of the valve disc (11) facing the support is provided with a lightening groove.

8. A pipe system, characterised in that Comprise: The check valve according to any one of claims 1-7; An input pipe (5) for conveying medium into the valve cavity; An output pipe for outputting medium in the valve cavity.

9. The plumbing system of claim 8, wherein, The input pipe (5) comprises a pipe joint (51), the outer peripheral wall of the pipe joint (51) is provided with a limiting portion, the pipe joint (51) is inserted into the liquid inlet pipe (16) along the axial direction of the pipe joint (51) so that the liquid inlet pipe (16) abuts against the limiting portion along the axial direction of the liquid inlet pipe (16), and the pipe joint (51) and the liquid inlet pipe (16) are connected by a fastener extending radially along the input pipe (5); And / or, the output pipe comprises a pipe joint (51), the outer peripheral wall of the pipe joint (51) is provided with a limiting portion, the pipe joint (51) is inserted into the liquid outlet pipe (17) along the axial direction of the pipe joint (51) so that the liquid outlet pipe (17) abuts against the limiting portion along the axial direction of the liquid outlet pipe (17), and the pipe joint (51) and the liquid outlet pipe (17) are connected by a fastener extending radially along the input pipe (5).

10. The plumbing system of claim 9, wherein, One of the liquid inlet pipe (16) and the pipe joint (51) is provided with a limiting groove (53) extending along the circumferential direction and a plug-in groove (52) extending along the axial direction, one end of the limiting groove (53) extends to the inner wall of the plug-in groove (52), the other is provided with a protruding portion (18), the protruding portion (18) can be inserted into the plug-in groove (52) along the axial direction of the pipe joint (51) to abut against the groove bottom wall of the plug-in groove (52), and the pipe joint (51) can rotate circumferentially relative to the liquid inlet pipe (16) so that the protruding portion (18) enters the limiting groove (53) to abut against the groove bottom wall of the limiting groove (53); And / or, one of the liquid outlet pipe (17) and the pipe joint (51) is provided with a limiting groove (53) extending along the circumferential direction and a plug-in groove (52) extending along the axial direction, one end of the limiting groove (53) extends to the inner wall of the plug-in groove (52), the other is provided with a protruding portion (18), the protruding portion (18) can be inserted into the plug-in groove (52) along the axial direction of the pipe joint (51) to abut against the groove bottom wall of the plug-in groove (52), and the pipe joint (51) can rotate circumferentially relative to the liquid outlet pipe (17) so that the protruding portion (18) enters the limiting groove (53) to abut against the groove bottom wall of the limiting groove (53).

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