Stop check valve

Abstract

The utility model relates to the technical field of valves, and discloses a cut-off check valve which comprises a valve body, a valve core, a valve core, a valve core, a valve core, a valve core and a valve core, the valve clack assembly is arranged in the cavity, and the valve clack assembly has a cut-off state for blocking the flow channel and a non-return state for preventing a medium in the flow channel from reversely flowing; the driving mechanism has a first state abutting against the valve clack assembly to enable the valve clack assembly to be in a cut-off state and a second state far away from the valve clack assembly to enable the valve clack assembly to be in a non-return state. According to the stop check valve, the valve clack assembly is controlled to be switched between the stop state and the check state through the driving mechanism, so that the stop check valve is controlled to be freely switched between the stop function and the check function through an external power driving device.

Description

Technical Field

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

[0002] The stop check valve is a multi-purpose valve that has both stop valve and check valve functions. Its overall structure is similar to that of the stop valve, but the valve stem and the valve disc are not fixedly connected. When the valve stem descends and presses the valve disc against the valve seat, it acts as a stop valve; when the valve stem rises, it acts as a check valve. On pipelines where stop valves and check valves need to be installed at the same time, or in places where the installation position is restricted, the use of stop check valves can save installation costs and space. However, most existing stop check valves adopt a lifting structure, and some swing-type stop check valves adopt a Y-type structure and are driven by a handwheel. It is not suitable to control the stop check valve to switch freely between the stop function and the check function through an external power drive device. Utility Model Content

[0003] In view of this, the utility model provides a stop check valve to solve the problem that the stop function and the check function of the stop check valve are not suitable for being controlled by an external power drive device.

[0004] The utility model provides a stop check valve, comprising:

[0005] A valve body having a flow passage therethrough, and an interior of the valve body having a cavity partially overlapping the flow passage;

[0006] The valve flap assembly is arranged in the cavity, and the valve flap assembly has a cut-off state for blocking the flow channel and a non-return state for preventing the medium in the flow channel from flowing in the reverse direction;

[0007] The driving mechanism has a first state in which the valve flap assembly is abutted to make it in a cut-off state, and a second state in which the valve flap assembly is away from the valve flap assembly to make it in a non-return state.

[0008] Beneficial effect: The valve flap assembly is controlled to switch between the cut-off state and the non-return state through the driving mechanism, so as to realize free switching between the cut-off function and the non-return function by controlling the cut-off check valve through an external power driving device.

[0009] In an optional embodiment, the driving mechanism includes a driving rod arranged corresponding to the valve flap assembly, a partial area of ​​the driving rod is located in the cavity, and reciprocates relative to the valve body, the driving rod abuts against the valve flap assembly, so as to be suitable for putting the driving mechanism in a first state; the driving rod is away from the valve flap assembly, so as to be suitable for putting the driving mechanism in a second state.

[0010] In an optional embodiment, a bracket is fixedly connected to the outer wall of the valve body, the bracket is provided with a hollow cavity connected to the cavity, and the driving rod is passed through the hollow cavity; the driving mechanism also includes a valve stem nut, the valve stem nut is sleeved on the outer peripheral wall of the driving rod and is rotatably connected to the bracket, the bracket is suitable for supporting the valve stem nut, and the valve stem nut rotates around itself to drive the driving rod to perform reciprocating motion.

[0011] In an optional embodiment, a groove communicating with the hollow cavity is provided on the side wall of the bracket along the axial direction of the driving rod, and an orientation block is provided on the peripheral wall of the driving rod, and the orientation block is slidably connected in the groove.

[0012] Beneficial effect: By arranging a directional block on the driving rod and making the directional block slidably connected in the groove, the driving rod is prevented from rotating around itself.

[0013] In an optional embodiment, a first bearing is arranged between the valve stem nut and the bracket.

[0014] Beneficial effect: By arranging the first bearing between the valve stem nut and the bracket, the rotational friction between the valve stem nut and the bracket can be reduced.

[0015] In an optional embodiment, the driving mechanism further comprises a driver, an output end of the driver performs a rotational motion, and the output end is suitable for being coaxially fixedly connected with the valve stem nut.

[0016] In an optional embodiment, the output end is tooth-engaged with the valve stem nut.

[0017] Beneficial effect: The output end is connected to the valve stem nut in a tooth-embedded manner, so that the output end and the valve stem nut can be easily disassembled, which is beneficial to improving the disassembly efficiency.

[0018] In an optional embodiment, the valve flap assembly includes a rocker arm, which is hingedly connected to the valve body, and the valve flap is fixedly connected to the rocker arm. The drive rod is suitable for abutting against the rocker arm to drive the valve flap to block the flow channel.

[0019] In an optional embodiment, the axis of the driving rod deviates from the symmetry centerline of the valve body in the horizontal direction and is located on a side of the symmetry centerline away from the hinge axis of the rocker arm and the valve body.

[0020] Beneficial effect: By eccentrically arranging the driving rod and the valve body and situating the driving rod on the side of the hinge axis away from the rocker arm and the valve body with the center of symmetry, the force arm of the driving rod when closing the valve disc is increased, thereby reducing the driving force required to close the valve disc, and being able to adjust the center of gravity position of the driving mechanism to reduce the overall weight eccentricity of the stop check valve.

[0021] In an optional embodiment, a lug is provided on the rocker, and the lug has a matching abutment surface corresponding to the end of the driving rod. When the driving mechanism is in the first state, the driving rod is suitable for forming a surface contact with the abutment surface.

[0022] Beneficial effect: By providing an abutment surface that matches the end of the drive rod on the lug, when the drive rod abuts against the lug, the surface contact is maintained as the abutment position changes, thereby reducing the pressure at the abutment position and improving the durability of the lug and the drive rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a front view of the stop check valve of the utility model;

[0025] Figure 2 It is a cross-sectional schematic diagram of the stop check valve of the utility model;

[0026] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0027] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0028] Figure 5 for Figure 2 A partial enlarged view of point C in the middle;

[0029] Figure 6 It is a cross-sectional schematic diagram of the limiting plate and the fixing plate of the utility model;

[0030] Figure 7 for Figure 6 Schematic diagram of the cross section at D in the middle;

[0031] Figure 8 It is a side view of the stop check valve of the utility model;

[0032] Fig. 9 It is a three-dimensional schematic diagram of the practical stop check valve;

[0033] Fig.10 It is a schematic diagram of the second tooth block on the output end of the driver of the utility model;

[0034] Fig.11It is a schematic diagram of the first tooth block on the valve stem nut of the utility model;

[0035] Fig.12 It is a schematic diagram of the driving rod of the utility model beginning to contact with the rocker;

[0036] Fig.13 This is a schematic diagram of the driving rod of the utility model pressing the valve disc against the valve body.

[0037] Description of reference numerals:

[0038] 1. Valve body; 2. Flow channel; 3. Valve disc assembly; 31. Support; 32. Rocker; 321. Lug; 33. Valve disc; 34. Pin; 35. Connecting bolt; 4. Driving mechanism; 41. Driving rod; 411. Orienting block; 42. Valve stem nut; 421. Boss; 422. First tooth block; 43. Driver; 431. Output end; 432. Second tooth block; 5. Cavity; 6. Valve cover; 7. Bracket; 71 , groove; 72, hollow cavity; 8, first bearing; 9, seat ring; 10, connecting flange; 11, sealing structure; 111, packing gasket; 112, first packing group; 113, spacer ring; 114, second packing group; 115, first pressure sleeve; 116, pressure plate; 12, sealing ring; 13, support frame; 14, second pressure sleeve; 15, second bearing; 16, connecting screws; 17, limit plate; 18, fixing plate. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Combine the following Figures 1 to 13 , describing an embodiment of the utility model.

[0044] According to an embodiment of the utility model, a stop check valve is provided, comprising:

[0045] A valve body 1 has a flow channel 2 running through it, and the valve body 1 has a cavity 5 partially overlapping with the flow channel 2;

[0046] The valve flap assembly 3 is arranged in the cavity 5, and the valve flap assembly 3 has a cut-off state for blocking the flow channel 2, and a non-return state for preventing the medium in the flow channel 2 from flowing in the reverse direction;

[0047] The driving mechanism 4 has a first state in which it abuts against the valve flap assembly 3 to put it in a cut-off state, and a second state in which it is away from the valve flap assembly 3 to put it in a non-return state.

[0048] The stop check valve provided in this embodiment controls the valve flap assembly 3 to switch between the stop state and the check state through the driving mechanism 4, so as to realize free switching of the stop check valve between the stop function and the check function through the external power driving device.

[0049] Specifically, taking the stop check valve used in the nuclear power field as an example, in the related art, the stop check valve is mostly driven by a hand wheel, which is not suitable for being driven by an external power device. The operator needs to manually control the stop check valve to switch between the stop function and the check function. It is mostly suitable for low-pressure conditions, but not for the high-temperature and high-pressure conditions of nuclear power plants. The drive mechanism 4 is used as an external power drive device to control the valve disc assembly 3 to switch between the stop state and the check state, so as to be suitable for high-temperature and high-pressure conditions.

[0050] Preferably, the flow channel 2 inside the valve body 1 is a straight tube type, which is S-shaped compared to the internal flow channel of the stop check valve in the related art. When high-speed fluid media passes through, it can reduce pressure loss and improve the flow capacity of the stop check valve.

[0051] In some embodiments, in combination Figures 1 to 13 As shown, the driving mechanism 4 includes a driving rod 41 arranged corresponding to the valve flap assembly 3, a partial area of ​​the driving rod 41 is located in the cavity 5, and reciprocates relative to the valve body 1, the driving rod 41 abuts against the valve flap assembly 3, so as to be suitable for the driving mechanism 4 to be in a first state; the driving rod 41 is away from the valve flap assembly 3, so as to be suitable for the driving mechanism 4 to be in a second state.

[0052] Specifically, the flow channel 2 forms two openings at the junction with the cavity 5, and the valve flap assembly 3 is arranged near one of the openings, and has a first position for covering the opening, and a second position for giving way to the opening. The drive mechanism 4 is started, and the drive rod 41 is controlled to extend and contact the valve flap assembly 3, and gradually press the valve flap assembly 3 against the inner wall of the valve body 1. When pressed in place, the valve flap assembly 3 covers the opening. At this time, the stop check valve has a stop function to prevent the internal medium from flowing forward and backward; the drive mechanism 4 controls the drive rod 41 to be retracted and not in contact with the valve flap assembly 3. At this time, the valve flap assembly 3 is movably connected to the valve body 1 and can be switched between the first position and the second position under the action of the fluid medium. The stop check valve has a check function to make the internal medium flow forward and prevent the medium from flowing backward. Further, in the related art, a reset spring is arranged inside the stop check valve to reset the valve stem or valve flap. The reset spring has the risk of fatigue fracture in the cyclic action. In the application scenario of nuclear power plants, the debris generated by the fracture will enter the fluid medium to cause a significant safety risk. In the present application, the driving mechanism 4 controls the driving rod 41 to move back and forth to control the valve flap assembly 3 to switch between the cut-off function and the non-return function, thereby avoiding the safety risk caused by the breakage of the reset spring.

[0053] In some embodiments, in combination Figures 1 to 13 As shown, a bracket 7 is fixedly connected to the outer wall of the valve body 1, and the bracket 7 is provided with a hollow cavity 72 connected to the cavity 5, and the driving rod 41 is penetrated in the hollow cavity 72; the driving mechanism 4 also includes a valve stem nut 42, the valve stem nut 42 is sleeved on the outer peripheral wall of the driving rod 41, and is rotatably connected to the bracket 7, the bracket 7 is suitable for supporting the valve stem nut 42, and the valve stem nut 42 rotates around itself to drive the driving rod 41 to reciprocate.

[0054] Specifically, a through hole is formed on the side wall of the valve body 1 corresponding to the cavity 5, and a valve cover 6 is fixedly connected to the side wall of the valve body 1. The valve cover 6 is fixedly connected to the side wall of the valve body 1 by bolts and covers the through hole. The bracket 7 is fixedly connected to the end face of the valve cover 6 away from the valve body 1. The valve cover 6 is provided with a through hole corresponding to the cavity 5 and the hollow cavity 72. The driving rod 41 in the hollow cavity 72 is penetrated through the through hole and extends into the cavity 5. The end face of the bracket 7 away from the valve cover 6 is fixedly connected to the connecting flange 10, and the end face of the connecting flange 10 away from the bracket 7 is fixedly connected to the supporting frame 13. The valve stem nut 42 is located inside the connecting flange 10 and is rotatably connected to the connecting flange 10. The bracket 7 and the supporting frame 13 are suitable for forming a limit on both ends of the valve stem nut 42, so that the valve stem nut 42 is rotatably connected to the bracket 7 while preventing the valve stem nut 42 from being relatively displaced with the bracket 7 along its axial direction. The valve stem nut 42 is threadedly matched with the drive rod 41. When the valve stem nut 42 rotates around its own axis and the drive rod 41 cannot rotate around its own axis, the drive rod 41 can be controlled to move relative to the valve stem nut 42 along its axial direction under the action of the thread.

[0055] The inner wall of the through hole is concave in a part of the area corresponding to the peripheral wall of the driving rod 41 to form a third groove. The third groove forms an opening on the side wall of the valve cover 6 away from the valve body 1, and a sealing structure 11 is arranged in the third groove. The sealing structure 11 includes a packing ring 111 sleeved on the driving rod 41. The packing ring 111 is located at one end of the third groove close to the valve body 1 and abuts against the inner wall of the third groove. The side of the packing ring 111 away from the valve body 1 is filled with a first packing group 112 and a second packing group 114. The materials of the first packing group 112 and the second packing group 114 include cotton cloth, metal, asbestos, graphite, plastic, etc. The selection of sealing packing materials is well known to those skilled in the art. A spacer ring 113 is also arranged between the first packing group 112 and the second packing group 114, and the spacer ring 113 is sleeved on the driving rod 41. The sealing structure 11 also includes a first pressing sleeve 115 sleeved on the driving rod 41. The first pressing sleeve 115 is located on the side of the first packing group 112 and the second packing group 114 away from the packing gasket 111. A pressure plate 116 sleeved on the driving rod 41 is abutted on the side of the first pressing sleeve 115 away from the first packing group 112 and the second packing group 114. The pressure plate 116 is fixedly connected to the valve cover 6 by bolts, so that the first packing group 112 and the second packing group 114 are clamped in the third groove through the first pressing sleeve 115.

[0056] In some embodiments, in combination Figures 1 to 13 As shown, along the axial direction of the driving rod 41 , a groove 71 communicating with the hollow cavity 72 is opened on the side wall of the bracket 7 , and an orientation block 411 is provided on the peripheral wall of the driving rod 41 , and the orientation block 411 is slidably connected in the groove 71 .

[0057] The stop check valve provided in this embodiment is configured with an orientation block 411 on the driving rod 41, and the orientation block 411 is slidably connected in the groove 71, so as to prevent the driving rod 41 from rotating around itself.

[0058] Specifically, the extension direction of the groove 71 is parallel to the axial direction of the driving rod 41. The orientation block 411 is located in the groove 71 and is suitable for moving along the extension direction of the groove 71, thereby forming a circumferential limit on the driving rod 41 to prevent the driving rod 41 from rotating around its own axis and allowing the driving rod 41 to move only along its axial direction.

[0059] In some embodiments, in combination Figures 1 to 13 As shown, a first bearing 8 is provided between the valve stem nut 42 and the bracket 7 .

[0060] The stop check valve provided in this embodiment provides a first bearing 8 between the valve stem nut 42 and the bracket 7 so as to reduce the rotational friction between the valve stem nut 42 and the bracket 7 .

[0061] Specifically, the first bearing 8 is a plane bearing, and a local area of ​​the outer peripheral wall of the stem nut 42 protrudes to form a boss 421. The boss 421 can be an integral structure and arranged around the stem nut 42, or a split structure and arranged at intervals along the circumference of the stem nut 42. The first bearing 8 is sleeved on the stem nut 42 and located between the boss 421 and the bracket 7, so as to reduce the friction damping of the stem nut 42 rotating relative to the bracket 7 and prevent the stem nut 42 from moving in the direction close to the valve body 1 along its axial direction. A second pressing sleeve 14 is also provided in the connecting flange 10 and sleeved on the stem nut 42. One end face of the second pressing sleeve 14 abuts against the support frame 13, and the other end face abuts against the boss 421. The stem nut 42 is limited by the support frame 13 and the second pressing sleeve 14 to prevent the stem nut 42 from moving in the direction away from the valve body 1 along its axial direction. Furthermore, a second bearing 15 is provided between the second pressing sleeve 14 and the boss 421. The second bearing 15 is a plane bearing and is sleeved on the outer peripheral wall of the stem nut 42 to reduce the rotational friction damping between the stem nut 42 and the second pressing sleeve 14. The bracket 7 is formed with a rotation hole corresponding to the stem nut 42. A part of the stem nut 42 extends into the rotation hole and is rotationally connected with the rotation hole to increase the rotational stability of the stem nut 42 and the bracket 7. Furthermore, a sealing ring 12 is provided between the outer peripheral wall of the stem nut 42 and the inner wall of the rotation hole. The sealing ring is arranged around the stem nut 42 to prevent dust from entering the interior of the connecting flange 10 and damaging the first bearing 8 and the second bearing 15.

[0062] In some embodiments, in combination Figures 1 to 13As shown, the driving mechanism 4 further includes a driver 43 , an output end 431 of the driver 43 performs a rotational motion, and the output end 431 is suitable for being coaxially fixedly connected with the valve stem nut 42 .

[0063] Specifically, the driver 43 includes an electric motor, a hydraulic motor or a pneumatic motor. The driver 43 is fixedly connected to the end face of the support frame 13 away from the connecting flange 10. The support frame 13 is suitable for supporting the driver 43. The driver 43 is suitable for driving the output end 431 to make a rotational motion. The rotation plane of the output end 431 is perpendicular to the axis of the driving rod 41, so as to drive the valve stem nut 42 to rotate around its own axis.

[0064] In some embodiments, in combination Figures 1 to 13 As shown, the output end 431 is tooth-engaged with the valve stem nut 42 .

[0065] The stop check valve provided in this embodiment is tooth-engaged with the valve stem nut 42 via the output end, so as to facilitate the disassembly of the output end 431 and the valve stem nut 42, which is beneficial to improving the disassembly efficiency.

[0066] Specifically, a second tooth block 432 is protruded from a local area of ​​the end surface of the output end 431 near the valve stem nut 42, and the number of the second tooth block 432 is at least one. A first tooth block 422 is protruded from a local area of ​​the end surface of the valve stem nut 42 near the output end 431, and the number of the first tooth blocks 422 matches the number of the second tooth blocks 432, and a tooth-type fit is formed to facilitate the transmission of rotational force. When disassembling the driver 43, it is only necessary to loosen the bolts connecting the driver 43 and the support frame 13 to directly remove the driver 43. The driver 43 can be directly removed without removing the drive rod 41, which facilitates the disassembly of the driver 43.

[0067] In some embodiments, in combination Figures 1 to 13 As shown, the valve flap assembly 3 includes a rocker 32 , which is hingedly connected to the valve body 1 , and a valve flap 33 is fixedly connected to the rocker 32 . The driving rod 41 is suitable for abutting against the rocker 32 to drive the valve flap 33 to block the flow channel 2 .

[0068] Specifically, the flow channel 2 is fixedly connected with a seat ring 9 near the opening of the valve disc assembly 3, and the seat ring 9 is arranged around the opening. When the valve disc assembly 3 is in the cut-off state, the valve disc 33 is tightly pressed against the seat ring 9 to block the flow channel 2. The valve disc assembly 3 also includes a support 31 fixedly connected to the inner wall of the valve body 1, and a clearance hole is provided in the middle of the support 31 to form a clearance for the rocker 32 and the driving rod 41. The rocker 32 is hingedly connected to the support 31 through a pin 34, and then forms a hinged connection with the valve body 1. The valve disc 33 is fixedly connected to the rocker 32 through a connecting bolt 35, and is hingedly connected to the valve body 1 through the rocker 32. The end surface of the support 31 away from the seat ring 9 is abutted against the limit plate 17, and a first groove is formed on the side wall of the valve body 1 corresponding to the limit plate 17. A part of the limit plate 17 is located in the first groove, and the area exposed in the first groove is suitable for limiting the support 31 in a direction parallel to the axial direction of the driving rod 41. The end surface of the support 31 away from the seat ring 9 is also fixedly connected with a fixing plate 18. The fixing plate 18 is fixedly connected with the support 31 through the connecting screws 16, and a second groove is formed corresponding to the position of the limit plate 17. A part of the limit plate 17 is located in the second groove, and the fixing plate 18 is suitable for abutting a part of the limit plate 17 in the first groove. The valve cover 6 can also cover the threaded holes on the fixing plate 18 to prevent the connecting screws 16 from falling off, thereby avoiding the major safety risk of small parts falling in the application scenario of nuclear power plants. The limit plate 17 and the fixing plate 18 are both annular, so as to be suitable for giving way to the rocker 32 and the drive rod 41. The limit plate 17 and the fixing plate 18 can be an integral annular structure or a split annular structure. For example, the limit plate 17 is a four-part plate, that is, the annular plate is equally divided into four arc-shaped plates. Of course, the limit plate 17 or the fixing plate 18 can also form a split annular structure according to other numbers.

[0069] In some embodiments, in combination Figures 1 to 13 As shown, the axis of the driving rod 41 deviates from the symmetric center line of the valve body 1 in the horizontal direction, and is located on the side of the symmetric center line away from the hinge axis of the rocker arm 32 and the valve body 1.

[0070] The stop check valve provided in this embodiment is configured such that the drive rod 41 is eccentrically arranged with respect to the valve body 1 and is located on the side of the symmetry center line away from the rocker arm 32 and the hinge axis of the valve body 1, so as to increase the force arm of the drive rod 41 when closing the valve flap 33, thereby reducing the driving force required to close the valve flap 33, and can adjust the center of gravity position of the drive mechanism 4 to reduce the overall weight eccentricity of the stop check valve.

[0071] Specifically, the axis of the driving rod 41 is located on the side of the symmetric center line of the valve body 1 away from the pin 34, so as to increase the force arm and reduce the force required to abut the rocker 32 and drive the valve disc 33 to move closer to the seat ring 9, which is conducive to reducing the specifications of the required driver 43, thereby reducing the weight of the driving mechanism 4 and the weight of the external device of the valve body 1. Figure 1 As shown, by making the center of gravity of the driving mechanism 4 located on the side of the axis of the driving rod 41 toward the symmetry center line, the center of gravity eccentricity of the stop check valve as a whole can be counterweighted to reduce the overall weight eccentricity of the stop check valve, which is beneficial to setting a support device for the stop check valve on the pipeline.

[0072] In some embodiments, in combination Figures 1 to 13 As shown, the rocker 32 is provided with a lug 321 , and the lug 321 has a matching abutment surface corresponding to the end of the driving rod 41 . When the driving mechanism 4 is in the first state, the driving rod 41 is suitable for forming a surface contact with the abutment surface.

[0073] The stop check valve provided in this embodiment is provided with an abutment surface adapted to the end of the driving rod 41 on the lug 321, so that when the driving rod 41 abuts against the lug 321, the surface contact is maintained as the abutment position changes, thereby reducing the pressure at the abutment position and improving the durability of the lug 321 and the driving rod 41.

[0074] Specifically, the lug 321 is located on the side of the rocker arm 32 close to the driving rod 41. Preferably, the middle part of the end of the driving rod 41 close to the rocker arm 32 is a plane, and the edge is an arc surface. The shape of the abutting surface on the lug 321 is adapted to the end of the driving rod 41. The contact area of ​​the lug 321 when it starts to contact the end of the driving rod 41 is a plane. When the driving rod 41 presses the valve disc 33 into place, the contact area between the lug 321 and the end of the driving rod 41 is also a plane, and there is a continuous arc surface between the two planes, so that the driving rod 41 and the lug 321 always maintain surface contact during the contact process, so as to avoid excessive pressure at the contact point during line contact, thereby damaging the surface of the lug 321 or the driving rod 41, thereby improving the durability of the lug 321 and the driving rod 41, avoiding the generation of debris to contaminate the fluid medium in the flow channel 2, and avoiding the major safety hazards of debris in the application scenario of nuclear power plants. Additionally, the end of the driving rod 41 may also be a spherical surface, and the area where the lug 321 contacts the driving rod 41 is an arcuate surface adapted to the spherical surface, so that the driving rod 41 and the lug 321 always maintain surface contact during the contact process.

[0075] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A stop check valve, characterized in that: include: A valve body (1) having a flow channel (2) running through it, wherein the valve body (1) has a cavity (5) inside that partially overlaps with the flow channel (2); A valve flap assembly (3) is arranged in the cavity (5), and the valve flap assembly (3) has a cut-off state for blocking the flow channel (2) and a non-return state for preventing the medium in the flow channel (2) from flowing in the reverse direction; A driving mechanism (4) having a first state in which it abuts against the valve flap assembly (3) so that it is in the cut-off state, and a second state in which it is away from the valve flap assembly (3) so that it is in the non-return state; The driving mechanism (4) comprises a driving rod (41) arranged corresponding to the valve flap assembly (3); a partial area of ​​the driving rod (41) is located in the cavity (5) and reciprocates relative to the valve body (1); the driving rod (41) abuts against the valve flap assembly (3) so as to place the driving mechanism (4) in the first state; the driving rod (41) is away from the valve flap assembly (3) so as to place the driving mechanism (4) in the second state.

2. The stop check valve according to claim 1, characterized in that: A bracket (7) is fixedly connected to the outer wall of the valve body (1), and the bracket (7) is provided with a hollow cavity (72) connected to the cavity (5), and the drive rod (41) is inserted into the hollow cavity (72); the drive mechanism (4) also includes a valve stem nut (42), the valve stem nut (42) is sleeved on the outer wall of the drive rod (41) and is rotatably connected to the bracket (7), the bracket (7) is suitable for supporting the valve stem nut (42), and the valve stem nut (42) rotates around itself to drive the drive rod (41) to perform reciprocating motion.

3. The stop check valve according to claim 2, characterized in that: Along the axial direction of the driving rod (41), a groove (71) communicating with the hollow cavity (72) is provided on the side wall of the bracket (7), and an orientation block (411) is provided on the peripheral wall of the driving rod (41), and the orientation block (411) is slidably connected in the groove (71).

4. The stop check valve according to claim 3, characterized in that: A first bearing (8) is arranged between the valve stem nut (42) and the bracket (7).

5. The stop check valve according to claim 2, characterized in that: The driving mechanism (4) further comprises a driver (43), the output end (431) of the driver (43) performs a rotational motion, and the output end (431) is suitable for being coaxially fixedly connected with the valve stem nut (42).

6. The stop check valve according to claim 5, characterized in that: The output end (431) is tooth-engaged with the valve stem nut (42).

7. The stop check valve according to any one of claims 1 to 5, characterized in that: The valve flap assembly (3) comprises a rocker (32), the rocker (32) being hingedly connected to the valve body (1), the valve flap (33) being fixedly connected to the rocker (32), and the drive rod (41) being adapted to abut against the rocker (32) to drive the valve flap (33) to block the flow channel (2).

8. The stop check valve according to claim 7, characterized in that: The axis of the driving rod (41) deviates from the symmetry center line of the valve body (1) in the horizontal direction, and is located on the side of the symmetry center line away from the hinge axis of the rocker arm (32) and the valve body (1).

9. The stop check valve according to claim 8, characterized in that: The rocker (32) is provided with a lug (321), and the lug (321) has a matching abutment surface corresponding to the end of the drive rod (41). When the drive mechanism (4) is in the first state, the drive rod (41) is suitable for forming a surface contact with the abutment surface.

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