Stop check valve

Abstract

The invention discloses a stop check valve. The stop check valve comprises a valve body, a valve clack and a locking mechanism. A fluid passage is defined in the valve body. The valve clack is arranged in the fluid channel, and the valve clack has a rotatable state and a non-rotatable state. The locking mechanism is arranged in the fluid channel, has a locking position and a releasing position, and is arranged to be capable of locking the valve clack to keep the valve clack in a non-rotating state when the locking mechanism is in the locking position; when the locking mechanism is located at the releasing position, the valve clack can be released to be in a rotatable state. According to the stop check valve, the valve clack and the locking mechanism which rotate around the common axis are arranged, so that the stop check valve can achieve the functions of a stop valve and a swing check valve at the same time.

Description

Technical Field

[0001] The present application relates to the field of fluid mechanical equipment, and in particular to a stop check valve. Background Art

[0002] A swing check valve is a commonly used check valve that includes a rotatable disc. The disc rotates by its own weight and the pressure difference between the inlet and outlet of the valve to allow the fluid to flow in one direction. A swing check valve is usually used in conjunction with a stop valve to block the flow of fluid when needed. Summary of the invention

[0003] The present application provides a stop check valve, comprising a valve body, a valve flap and a locking mechanism. A fluid channel is defined in the valve body. The valve flap is arranged in the fluid channel, and the valve flap has a rotatable state and a non-rotatable state. The locking mechanism is arranged in the fluid channel and has a locking position and a release position. The locking mechanism is configured to lock the valve flap so that it remains in a non-rotatable state when the locking mechanism is in the locking position, and to release the valve flap so that it is in a rotatable state when the locking mechanism is in the release position.

[0004] According to the above content, the valve body has a valve inlet and a valve outlet, and the valve inlet and the valve outlet are in fluid communication through the fluid channel. The valve flap has a valve flap open position and a valve flap closed position, wherein when the valve flap is in a rotatable state, the valve flap rotates between the valve flap open position and the valve flap closed position based on the pressure difference between the valve inlet and the valve outlet to allow the fluid to flow from the valve inlet through the fluid channel to the valve outlet in one direction. And when the valve flap is in a non-rotatable state, the valve flap is located at the valve flap closed position.

[0005] According to the above content, the locking mechanism is arranged at the rear side of the valve flap. The valve body has a limiting portion, and the limiting portion is located at the front side of the valve flap. When the locking mechanism is in the locking position, the locking mechanism abuts against the valve flap, so that the limiting portion and the locking mechanism jointly keep the valve flap in the valve flap closed position and restrict the valve flap from rotating.

[0006] According to the above content, the stop check valve includes a valve flap sealing ring, which is arranged on the limiting portion or the valve flap, so that when the valve flap is located in the valve flap closed position, the valve flap sealing ring is sealingly connected between the limiting portion and the valve flap.

[0007] According to the above content, the locking mechanism also has an intermediate position and a first movement stroke and a second movement stroke. The locking mechanism is configured to reach the intermediate position after performing a rotational movement from the release position in the first movement stroke, and then perform a linear movement from the intermediate position in the second movement stroke until reaching the locking position.

[0008] According to the above, the stop check valve further comprises a valve shaft. The valve flap is connected to the valve shaft and is arranged to rotate around the valve shaft between the valve flap open position and the valve flap closed position. The locking mechanism comprises an elongated hole through which the valve shaft passes, and the locking mechanism is arranged to perform rotational movement around the valve shaft in the first movement stroke and to perform linear movement relative to the valve shaft along the elongated hole in the second movement stroke.

[0009] According to the above content, the locking mechanism further includes an elastic component, which is arranged in the elongated hole and is configured to apply a pre-tightening force along the length direction of the elongated hole to the valve shaft.

[0010] According to the above content, the locking mechanism also includes a slider, which is arranged in the elongated hole and located between the elastic component and the valve shaft, the top of the slider abuts against the elastic component, and the bottom of the slider includes a notch for accommodating the valve shaft.

[0011] According to the above content, the locking mechanism further includes a valve stem and a connecting block. The valve stem can abut against the valve flap. The connecting block is connected above the valve stem, and the valve stem and the connecting block move together, wherein the elongated hole is arranged in the connecting block.

[0012] According to the above content, the inner wall of the valve body has a limiting hole, and the limiting hole extends radially. The limiting hole is configured such that when the locking mechanism is in the second movement stroke, the bottom end of the valve stem is at least partially inserted into the limiting hole.

[0013] According to the above content, the valve flap includes a disc, a protrusion and a connecting rod. The protrusion is arranged at the rear side of the disc, and the protrusion is arranged to abut against the valve rod of the locking mechanism. The connecting rod connects the protrusion and the valve shaft so that the rotation of the valve shaft can drive the valve flap to rotate.

[0014] According to the above content, the bottom end of the valve stem has an inclined surface, and the inclined surface extends forward from top to bottom. The locking mechanism is configured so that when the locking mechanism reaches its locking position, the inclined surface contacts the top of the hole wall of the limiting hole, so that the valve disc sealing ring presses the limiting portion of the valve body and the valve disc.

[0015] According to the above content, the stop check valve also includes a handwheel device and a transmission mechanism. The handwheel device is connected to the valve body and is at least partially located outside the fluid channel, and the handwheel device can rotate. The transmission mechanism is located in the fluid channel and is a connecting block that transmits and connects the handwheel device and the locking mechanism, so that the locking mechanism is driven to move by the rotation of the handwheel device.

[0016] According to the above content, the transmission mechanism includes a hand wheel tooth portion and a locking mechanism tooth portion that mesh with each other, the hand wheel tooth portion is arranged on the hand wheel device, and the locking mechanism tooth portion is arranged on the connecting block of the locking mechanism.

[0017] According to the above content, the hand wheel tooth portion and the locking mechanism tooth portion are configured so that the locking mechanism tooth portion is driven to move by the rotational movement, lifting movement or spiral movement of the hand wheel tooth portion.

[0018] Other objects and advantages of the present application will be apparent from the following description of the present application with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A is a three-dimensional structural diagram of a stop check valve according to an embodiment of the present application;

[0020] Figure 1B for Figure 1A A partial exploded view of the stop check valve shown;

[0021] Figure 2A for Figure 1B Exploded view of the locking mechanism, hand wheel device and transmission mechanism in the

[0022] Figure 2B for Figure 2A A cross-sectional view of the locking mechanism, hand wheel device and transmission mechanism shown;

[0023] Figure 3A A cross-sectional view of the stop check valve showing the locking mechanism in a released position and the valve flap in a valve flap open position;

[0024] Figure 3B A cross-sectional view of the stop check valve is shown with the locking mechanism in an intermediate position and the valve disc in a valve disc closed position;

[0025] Figure 3C A cross-sectional view of the stop check valve is shown with the locking mechanism in the locked position and the valve flap in the valve flap closed position;

[0026] Figure 4AA three-dimensional diagram showing a hand wheel device, a transmission mechanism and a locking mechanism in a stop check valve according to another embodiment of the present application;

[0027] Figure 4B Show Figure 4A An exploded view of the hand wheel device, transmission mechanism and locking mechanism shown;

[0028] Figure 4C Show Figure 4A A cross-sectional view of the hand wheel device, transmission mechanism and locking mechanism shown;

[0029] Figure 5 A stereoscopic diagram of a hand wheel device, a transmission mechanism and a locking mechanism in a stop check valve according to another embodiment of the present application is shown. DETAILED DESCRIPTION

[0030] Various specific embodiments of the present invention will be described below with reference to the accompanying drawings that form a part of this specification. It should be understood that although terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "top", "bottom", etc., are used in this application to describe various example structural parts and elements of the present application, these terms are used here only for the purpose of convenience of description and are determined based on the example orientations shown in the accompanying drawings. Since the embodiments disclosed in this application can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations.

[0031] Figure 1A-1B The specific structure of the stop check valve 100 according to an embodiment of the present application is shown. Figure 1A A three-dimensional structural diagram of the stop check valve 100 is shown to explain a general structure of the stop check valve 100 . Figure 1B FIG. 2 shows a partial exploded view of the stop check valve 100 for explaining the internal components of the stop check valve 100. Figure 1A and Figure 1BAs shown, the stop check valve 100 includes a valve body 101, which has a valve inlet 102 and a valve outlet 103, and defines a fluid channel 108 inside. The valve body 101 is roughly cylindrical in shape with openings at both ends, the opening on the left side thereof forms the valve inlet 102, and the opening on the right side thereof forms the valve outlet 103. The fluid channel 108 is used to fluidly connect the valve inlet 102 and the valve outlet 103. The stop check valve 100 also includes a valve flap 110, which is rotatably disposed in the fluid channel 108. In the present application, the valve flap 110 has a rotatable state and a non-rotatable state. When the valve flap 110 is in the rotatable state, the valve flap 110 can be rotated to connect or disconnect the fluid channel 108. When the valve flap 110 is in the non-rotatable state, the valve flap 110 is maintained in a position that disconnects the fluid channel 108. Specifically, the valve flap 110 has a valve flap open position (see Figure 3A shown) and the disc closed position (see Figure 3B ). When the valve flap 110 is in the valve flap open position, the valve flap 110 is substantially parallel to the extension direction of the fluid channel 108 or is inclined at an angle less than 90° with the fluid channel 108, so as not to hinder or not completely hinder the flow of fluid through the fluid channel 108. When the valve flap 110 is in the valve flap closed position, the valve flap 110 is substantially perpendicular to the extension direction of the fluid channel 108 to disconnect the fluid channel 108, thereby not allowing the fluid to flow through the fluid channel 108. And when the valve flap 110 is in a rotatable state, the valve flap 110 can rotate between the valve flap open position and the valve flap closed position based on the pressure difference of the fluid between the valve inlet 102 and the valve outlet 103, so as to allow the fluid to flow from the valve inlet 102 through the fluid channel 108 to the valve outlet 103 in one direction, or not allow the fluid to flow in the fluid channel 108. When the valve flap 110 is in a non-rotatable state, the valve flap 110 is maintained in the valve flap closed position to disconnect the fluid channel 108.

[0032] In the present application, the stop check valve 100 further includes a locking mechanism 120. The locking mechanism 120 is also disposed in the fluid passage 108 and has a locking position and a releasing position. When the locking mechanism 120 is in the locking position, the locking mechanism 120 can lock the valve flap 110, so that the valve flap 110 remains in a non-rotatable state and is located in a valve flap closed position, thereby disconnecting the fluid passage 108. When the locking mechanism 120 is in the releasing position, the locking mechanism 120 can release the valve flap 110, so that the valve flap 110 is in a rotatable state, and the locking mechanism 120 does not hinder the rotation of the valve flap 110. As an example, the locking mechanism 120 is disposed on the rear side of the valve flap 110, that is, Figure 1B The inner wall of the valve body 101 is provided with a limit portion 305 (see Figure 3A ), the limit portion 305 is arranged on the front side of the valve flap 110. When the locking mechanism 120 is in the locking position (see Figure 3C ), the locking mechanism 120 abuts against the valve flap 110 from the rear side, so that the limiting portion 305 and the locking mechanism 120 jointly keep the valve flap 110 in the valve flap closed position and restrict the valve flap 110 from rotating. Figure 3A ), the locking mechanism 120 is retracted into the fluid channel 108 at the top of the valve body 101 and is substantially parallel to the extension direction of the fluid channel 108, so as not to hinder the rotation of the valve flap 110. At this time, the valve flap 110 can rotate between the valve flap open position and the valve flap closed position based on the pressure difference of the fluid between the valve inlet 102 and the valve outlet 103.

[0033] In this embodiment, the locking mechanism 120 also has an intermediate position (see Figure 3B The locking mechanism 120 rotates from the release position in the first movement stroke and then reaches the intermediate position (i.e., from Figure 3A The release position shown is reached by rotating counterclockwise Figure 3B The locking mechanism 120 reaches the locking position (i.e., from the intermediate position) after linearly moving from the intermediate position in the second movement stroke. Figure 3B The middle position shown is reached by moving downwards Figure 3C When the locking mechanism 120 is in the locking position, the bottom end of the locking mechanism 120 can be at least partially inserted into the limiting hole 306 on the inner wall of the valve body 101 (see Figure 3A-3C As shown in FIG. 1 , the locking mechanism 120 is therefore locked, thereby maintaining the valve flap 110 in the valve flap closed position.

[0034] In this embodiment, the stop check valve 100 further includes a valve disc sealing ring 118, which is in the shape of a circular ring and is arranged on the valve disc 110 or the limiting portion 305 around the outer edge of the valve disc 110, so that when the valve disc 110 is in the valve disc closing position and the locking mechanism 120 is in the locking position, the valve disc sealing ring 118 can be sealed and connected between the valve disc 110 and the limiting portion 305, thereby ensuring the sealing effect of disconnecting the fluid channel 108. In some specific embodiments, the bottom end of the locking mechanism 120 has an inclined surface 123. The inclined surface 123 extends forward from top to bottom. When the locking mechanism 120 is in the locking position, the inclined surface 123 is used to contact the top of the hole wall of the limiting hole 306, so that the valve disc sealing ring 118 presses the limiting portion 305 and the valve disc 110 of the valve body 101.

[0035] More specifically, the locking mechanism 120 includes a valve stem 121 and a connecting block 122. The valve stem 121 is substantially vertically disposed in the fluid channel 108 and is used to abut against the rear side (i.e., the rear side) of the valve flap 110. Figure 1BThe valve stem 121 is provided on the right side of the valve flap 110 to limit the rotation of the valve flap 110 at certain times. For example, when the valve flap 110 is in the valve flap closed position, the valve stem 121 can limit the rotation of the valve flap 110 in the direction of the valve flap open position. The connecting block 122 is connected to the upper part of the valve stem 121 and is used to engage with the power part so that the operator can control the movement of the valve stem 121 through the connecting block 122, thereby limiting the rotation of the valve flap 110. The inclined surface 123 is provided on the rear side of the bottom end of the valve stem 121.

[0036] In this embodiment, the stop check valve 100 further includes a handwheel device 150 and a transmission mechanism 160, and the handwheel device 150 is at least partially connected to the outside of the valve body 101, so that the operator can operate the handwheel device 150 from the outside of the valve body 101. In this embodiment, the operator can twist the handwheel device 150 so that the handwheel device 150 can rotate.

[0037] The transmission mechanism 160 includes a handwheel tooth portion 264 and a locking mechanism tooth portion 263. The handwheel tooth portion 264 is disposed at the bottom of the handwheel device 150. The locking mechanism tooth portion 263 is disposed on the circumferential edge of the connecting block 122 of the locking mechanism 120. The handwheel tooth portion 264 and the locking mechanism tooth portion 263 mesh with each other to form a worm gear structure. The rotation of the handwheel device 150 drives the handwheel tooth portion 264 to rotate, and the handwheel tooth portion 264 then drives the connecting block 122 to rotate through the locking mechanism tooth portion 263. The more specific structures of the handwheel device 150, the transmission mechanism 160 and the locking mechanism 120 will be described in detail in conjunction with the embodiment of the present invention. Figure 2A and Figure 2B Although in the present embodiment, the hand wheel device 150 drives the connection block 122 to rotate by a rotational motion, in other embodiments, the hand wheel device 150 may also drive the connection block 122 to rotate by an ascending or descending motion (e.g. Figure 4A-4C ), or the hand wheel device 150 drives the connecting block 122 to rotate by a spiral motion (as shown in Figure 5 shown).

[0038] The stop check valve 100 further includes a valve shaft 128. The valve flap 110 is connected to the valve shaft 128 and is configured to rotate around the axis of the valve shaft 128 between a valve flap open position and a valve flap closed position. The connecting block 122 of the locking mechanism 120 is also connected to the valve shaft 128 and is configured to limit the movement trajectory of the locking mechanism 120 through the valve shaft 128. In this embodiment, the valve shaft 128 is fixedly connected to the valve body 101 and is therefore fixed relative to the valve body 101. The valve flap 110 rotates relative to the valve shaft 128. The connecting block 122 is provided with an elongated hole 224, which is in an elongated shape and extends in the longitudinal direction. The valve shaft 128 passes through the elongated hole 224. Due to the shape restriction of the elongated hole 224, the valve shaft 128 can only rotate relative to the elongated hole 224 or move linearly along the elongated hole 224. Therefore, the locking mechanism 120 can only perform a rotational movement in the first movement stroke or a linear movement in the second movement stroke.

[0039] The valve flap 110 includes a disc portion 111, a protrusion 115 and a connecting rod 112. The disc portion 111 is in the shape of a disc, and its shape and size are consistent with the limit portion 305 on the inner wall of the valve body 101 (see Figure 3A The disc 111 is provided with a valve stem 121 and a valve flap seal ring 118 around the edge of the disc 111, and is arranged between the disc 111 and the stopper 305. The disc 111 is arranged substantially parallel to the valve stem 121, for example, vertically connected in the fluid channel 108. The protrusion 115 is formed to protrude backward from the middle of the disc 111, and is used to abut against the locking mechanism 120, for example, abut against the valve stem 121 of the locking mechanism 120. The valve flap 110 is connected to the valve shaft 128 through a connecting rod 112. In this embodiment, the connecting rod 112 connects the protrusion 115 of the valve flap 110 and the valve shaft 128. The connecting rod 112 is set to a suitable shape so that both the locking mechanism 120 and the valve flap 110 can be connected to the valve shaft 128, and the protrusion 115 of the valve flap 110 can abut against the valve stem 121 of the locking mechanism 120.

[0040] Figure 2A-2B It is used to explain the more specific structure of the hand wheel device 150, the transmission mechanism 160 and the locking mechanism 120. Figure 2A An exploded view of the hand wheel device 150, the transmission mechanism 160 and the locking mechanism 120 is shown, Figure 2B 1 shows a cross-sectional view of the hand wheel device 150, the transmission mechanism 160 and the locking mechanism 120. Figure 2A and Figure 2BAs shown, the hand wheel device 150 includes a wheel disc 256 and a rod 252, and the wheel disc 256 is located outside the valve body 101 for operation by an operator. The rod 252 is connected to the wheel disc 256 through a nut 251, and the rod 252 passes through the valve body 101 and enters the fluid channel 108. The hand wheel tooth portion 264 is arranged at the bottom of the rod 252, and the hand wheel tooth portion 264 is in a spiral tooth shape to engage with the locking mechanism tooth portion 263 on the connecting block 122 of the locking mechanism 120. It can be understood by those skilled in the art that at least one sealing ring 253 can be provided at the connection between the valve body 101 and the rod 252, and the sealing ring 253 is sleeved on the middle part of the rod 252 to prevent the fluid in the fluid channel 108 from leaking to the outside of the valve body 101. In this embodiment, the hand wheel device 150 only rotates relative to the valve body 101, but does not move up and down.

[0041] The locking mechanism 120 is arranged on the front side of the rod 252 of the hand wheel device 150 so that the locking mechanism tooth portion 263 of the connecting block 122 is meshed with the hand wheel tooth portion 264. The connecting block 122 is roughly in the shape of a quarter gear, and the locking mechanism tooth portion 263 is arranged on the rim of the gear. In the present embodiment, the locking mechanism 120 rotates roughly 90° in the first movement stroke, so the connecting block 122 is set to be roughly in the shape of a quarter gear. According to the movement stroke of the locking mechanism 120, the connecting block 122 can also be set to other shapes. The elongated hole 224 penetrates the connecting block 122 along the thickness direction of the connecting block 122 and extends in the longitudinal direction. In order to match the shape of the valve shaft 128, the end of the elongated hole 224 in the length direction is in an arc shape and penetrates the top of the connecting block 122. In this embodiment, the locking mechanism 120 further includes a top cover 227 and an elastic component 225. The elastic component 225 is disposed in the elongated hole 224. The top cover 227 is disposed on the top of the connecting block 122 to close the elongated hole 224 from the top. The elastic component 225 is connected below the top cover 227 and extends in the length direction of the elongated hole 224 to apply a pre-tightening force along the length direction of the elongated hole 224 to the valve shaft 128.

[0042] In this embodiment, the locking mechanism 120 further includes a slider 226, which is arranged in the elongated hole 224 and located above the valve shaft 128, and the bottom of the slider 226 includes a notch 229 in the shape of an arc. The notch 229 is set to a shape matching the valve shaft 128 to accommodate the top of the valve shaft 128, that is, the valve shaft 128 can be accommodated between the slider 226 and the bottom end of the elongated hole 224. The elastic component 225 is a spring, and its elastic deformation direction is consistent with the length direction of the elongated hole 224. The top end of the spring is connected to the top cover 227, and the bottom end of the spring is supported to the slider 226 to apply a preload force to the valve shaft 128 through the slider 226. The preload force can keep the valve shaft 128 in a predetermined position without loosening or rotating. And because the spring is elastically deformed along the length direction of the elongated hole 224, the spring can also guide the valve shaft 128 to move along the length direction of the elongated hole 224. In some embodiments, certain limiting structures may also be provided at the edge of the elongated hole 224 to limit the movement direction of the valve shaft 128 and the slider 226 .

[0043] Therefore, when the connection block 122 rotates relative to the valve shaft 128, the elastic component 225 applies a preload force to the valve shaft 128 to keep the valve shaft 128 between the slider 226 and the bottom end of the elongated hole 224. When the connection block 122 moves linearly downward relative to the valve shaft 128, the connection block 122 applies a pressure to the valve shaft 128 that can overcome the preload force of the elastic component 225, and the valve shaft 128 presses the elastic component 225 to make the connection block 122 move downward relative to the valve shaft 128 along the length direction of the elongated hole 224.

[0044] The valve stem 121 of the locking mechanism 120 is connected to the lower part of the connecting block 122. In this embodiment, the top of the valve stem 121 has a pair of bosses 232, and the pair of bosses 232 are clamped on the outer side of a pair of side walls in the thickness direction of the connecting block 122. The pin 231 passes through the boss 232 and the connecting block 122 to connect the valve stem 121 with the connecting block 122. In order to avoid the rod 252 of the handwheel device 150 when the locking mechanism 120 is rotated to the locking position, the valve stem 121 is set to a corresponding shape. As a specific example, the top of the valve stem 121 has a pair of arched portions 233 arched outward from the valve stem 121 to form an avoidance hole 234 at the top of the valve stem 121. The avoidance hole 234 is used to accommodate the rod 252 when the locking mechanism 120 is rotated to the locking position.

[0045] Thus, the hand wheel device 150 can drive the locking mechanism 120 to move between the locking position and the releasing position through the transmission mechanism 160 .

[0046] Figure 3A-3C FIG. 1 shows a cross-sectional view of the stop check valve 100 during a process from opening to closing. Figure 3AA cross-sectional view of the stop check valve 100 is shown when the locking mechanism 120 is in the released position and the valve flap 110 is in the valve flap open position. Figure 3B The cross-sectional view of the stop check valve 100 is shown when the locking mechanism 120 is in the middle position and the valve flap 110 is in the valve flap closed position. Figure 3C The cross-sectional view of the stop check valve 100 is shown when the locking mechanism 120 is in the locked position and the valve flap 110 is in the valve flap closed position.

[0047] like Figure 3A As shown in FIG. 1 , the locking mechanism 120 is in its release position, and the locking mechanism 120 is accommodated at the top of the fluid channel 108. The rod portion 252 of the handwheel device 150 passes through the avoidance hole 234 of the valve stem 121, so that the valve stem 121 of the locking mechanism 120 can be approximately in a horizontal position, so the locking mechanism 120 does not affect the rotation opening or closing of the valve disc 110. The valve shaft 128 is in the rightmost position in the elongated hole 224, that is, Figure 2B The elastic member 225 is in the initial state and only applies a pre-tightening force to the valve shaft 128 to prevent the valve shaft 128 from loosening. The hand wheel tooth portion 264 on the hand wheel device 150 meshes with the rightmost tooth of the locking mechanism tooth portion 263 of the locking mechanism 120, that is, Figure 2B The bottommost tooth shown in .

[0048] At this time, the valve flap 110 is in a rotatable state, and can rotate around the axis of the valve shaft 128 between its valve flap open position and valve flap closed position based on the pressure difference between the valve inlet 102 and the valve outlet 103. Figure 3A In the state shown, the valve flap 110 is in the valve flap open position. When the pressure difference between the valve inlet 102 and the valve outlet 103 is less than a preset threshold, the valve flap 110 can rotate counterclockwise until the valve flap 110 is blocked by the limiter 305. At this time, the valve flap 110 can be in the valve flap closed position. The valve flap sealing ring 118 abuts between the valve flap 110 and the limiter 305, sealingly disconnecting the fluid channel 108.

[0049] When the operator rotates the hand wheel device 150, the hand wheel tooth portion 264 on the hand wheel device 150 rotates accordingly, and the locking mechanism tooth portion 263 meshing therewith drives the connection block 122 of the locking mechanism 120 to rotate. The connection block 122 of the locking mechanism 120 drives the locking mechanism 120 to rotate counterclockwise. Since the valve stem 121 of the locking mechanism 120 can abut against the valve flap 110, no matter the valve flap 110 is in the valve flap open position or the valve flap closed position, the locking mechanism 120 can push the valve flap 110 to rotate counterclockwise to Figure 3B Position shown.

[0050] like Figure 3BAs shown, the hand wheel tooth portion 264 and the top of the locking mechanism tooth portion 263 but not reaching the topmost teeth remain in meshing state. The locking mechanism 120 rotates to the middle position, and the valve flap 110 reaches its valve flap closed position. At this time, the valve flap seal ring 118 abuts between the valve flap 110 and the limit portion 305, sealingly disconnecting the fluid channel 108. The valve stem 121 abuts against the rear side of the valve flap 110, and together with the limit portion 305, the valve flap 110 is kept in its valve flap closed position.

[0051] The valve stem 121 of the locking mechanism 120 is substantially vertically disposed in the fluid channel 108, and the inclined surface 123 of the valve stem 121 is aligned with the top of the hole wall of the limiting hole 306, but the valve stem 121 has not yet been inserted into the limiting hole 306. The valve shaft 128 is at the bottom position in the long hole 224. The elastic component 225 is in an initial state, and only a pre-tightening force is applied to the valve shaft 128.

[0052] When the operator continues to rotate the hand wheel device 150, the hand wheel tooth portion 264 on the hand wheel device 150 rotates accordingly. At this time, since the valve flap 110 has abutted against the limit portion 305, the locking mechanism 120 cannot continue to push the valve flap 110 to rotate counterclockwise. The connecting block 122 of the locking mechanism 120 is limited by the rotation direction and can only overcome the pre-tightening force of the elastic component 225 to press the elastic component 225 upward to cause elastic deformation, so that the locking mechanism 120 moves downward to Figure 3C Position shown.

[0053] like Figure 3C As shown, the hand wheel tooth portion 264 is meshed with the topmost teeth of the locking mechanism tooth portion 263. The locking mechanism 120 rotates to the locking position, and the valve flap 110 is maintained in its valve flap closed position. At this time, the valve flap seal ring 118 abuts between the valve flap 110 and the limit portion 305, sealingly disconnecting the fluid channel 108. The valve stem 121 abuts against the rear side of the valve flap 110, and together with the limit portion 305, the valve flap 110 is maintained in its valve flap closed position. Since the locking mechanism 120 reaches its locking position, the valve flap 110 is in a non-rotatable state.

[0054] The valve stem 121 of the locking mechanism 120 is at least partially inserted downward into the limiting hole 306, so that the locking mechanism 120 cannot move backward (i.e. Figure 3C The inclined surface 123 of the valve stem 121 contacts the top of the hole wall of the limiting hole 306, so that the valve stem 121 generates a leftward force on the inclined surface 123 when moving downward, so that the valve disc sealing ring 118 can press the valve disc 110 and the limiting portion 305. Since the valve shaft 128 is fixed, the downward movement of the connecting block 122 causes the valve shaft 128 to move upward in the elongated hole 224 and leave the bottom end of the elongated hole 224.

[0055] At this time, no matter what the pressure difference between the valve inlet 102 and the valve outlet 103 is, the locking mechanism 120 can keep the valve flap 110 in a non-rotatable state, so that the stop check valve 100 can be closed.

[0056] Figure 4A-4C FIG. 4 shows the structures of the hand wheel device 450, the transmission mechanism 460 and the locking mechanism 120 in another embodiment of the stop check valve. Figure 4A A three-dimensional diagram showing a hand wheel device 450, a transmission mechanism 460 and a locking mechanism 120, Figure 4B Show Figure 4A An exploded diagram of Figure 4C Show Figure 4A The structure of the stop check valve of this embodiment is substantially the same as that of the stop check valve 100, the main difference being that the structures of the hand wheel device 450 and the transmission mechanism 460 are different, and the structure on the valve body can be arranged accordingly.

[0057] like Figure 4A-4C As shown, the hand wheel device 450 also includes a wheel disc 456 and a rod 452, and the rod 452 is connected to the bottom of the wheel disc 456. The rod 452 includes an upper rod 474 and a lower rod 475 that can be detachably arranged. The upper rod 474 is fixedly connected to the wheel disc 456 and is rotatably connected to the lower rod 475. Specifically, the bottom end of the upper rod 474 has a rotating boss 472 extending from its lower surface. The top of the lower rod 475 has a receiving groove 478, and the receiving groove 478 is configured to accommodate the shape in which the rotating boss 472 can rotate but cannot be displaced up and down. The circumferential surface of the bottom of the upper rod 474 is also provided with a spiral tooth 471, and the circumferential surface of the lower rod 475 is provided with a convex rib 473 extending in a straight line in a vertical direction. Correspondingly, the connecting portion between the valve body and the rod 452 of the hand wheel device 450 is provided with a spiral tooth (not shown in the figure) matched with the spiral tooth 471, and a groove (not shown in the figure) extending in a straight line in the vertical direction. Therefore, when the wheel 456 of the hand wheel device 450 is rotated, the wheel 456 drives the upper rod 474 to rotate and also to move up or down, that is, to perform a spiral motion. The lower rod 475 cannot rotate under the restriction of the rib 473, and can only be driven by the upper rod 474 to move up or down.

[0058] The transmission mechanism 160 includes a hand wheel tooth portion 464 and a locking mechanism tooth portion 463 that mesh with each other. The hand wheel tooth portion 464 is arranged on the circumferential surface of the bottom of the lower rod portion 475 and is located on the side of the connecting block 122 facing the locking mechanism 120. Since the lower rod portion 475 does not need to perform a rotational motion, but only performs a linear motion of rising or falling, the hand wheel tooth portion 464 does not need to cover the circumferential surface of the lower rod portion 475. In this embodiment, the structure of the locking mechanism tooth portion 463 is roughly the same as that of the locking mechanism tooth portion 263, except that the hand wheel tooth portion 264 is in the shape of a rack. When the lower rod portion 475 performs an ascending or descending motion, the hand wheel tooth portion 264 drives the locking mechanism tooth portion 463 to move by performing an ascending or descending motion, thereby driving the locking mechanism 120 to perform a rotational motion and a linear motion.

[0059] Figure 5 A three-dimensional diagram of a hand wheel device 550, a transmission mechanism 560 and a locking mechanism 120 in a stop check valve of another embodiment is shown. The structure of the stop check valve of this embodiment is also substantially the same as that of the stop check valve 100, the main difference being that the structure of the hand wheel device 550 is different, and the structure on the valve body can be arranged accordingly.

[0060] like Figure 5 As shown, the hand wheel device 550 includes a wheel disc 556 and a rod 552, and the rod 552 is connected to the lower part of the wheel disc 556. The structure of the transmission mechanism 560 is roughly the same as that of the transmission mechanism 160, and also includes a hand wheel tooth portion 564 and a locking mechanism tooth portion 563 that mesh with each other. In this embodiment, the rod 552 also has a spiral tooth 581, which is arranged on the circumferential surface of the rod 552 and is located above the hand wheel tooth portion 564. Correspondingly, a spiral tooth (not shown in the figure) that matches the spiral tooth 581 is provided at the connection part between the valve body and the rod 552. Therefore, when the wheel disc 556 of the hand wheel device 550 is rotated, the wheel disc 556 drives the rod 552 to rotate as a whole and also to move up or down, that is, to move in a spiral motion. When the rod 552 moves up or down, the hand wheel tooth portion 564 drives the locking mechanism tooth portion 563 to move by performing a spiral motion, thereby driving the locking mechanism 120 to perform a rotational motion and a linear motion.

[0061] The stop check valve of the present application is provided with a valve flap and a locking mechanism that rotate around a common axis, so that the stop check valve can simultaneously realize the functions of a stop valve and a swing check valve.

[0062] When the stop check valve of the present application is in the locking position of the locking mechanism, the valve disc is in the valve disc closed position and cannot rotate. Since the valve stem of the locking mechanism abuts against the rear side of the valve disc, the fluid pressure between the valve inlet and the valve outlet is mainly borne by the valve stem, and does not need to be borne by the valve disc. Not only is the pressure bearing function reliable, but the pressure bearing capacity is also good, which ensures the stop reliability of the stop check valve.

[0063] When the locking mechanism of the stop check valve of the present application is in the release position, the locking mechanism will hardly affect the opening and closing functions of the valve flap. And because the valve flap can be rotated to open, the stop check valve can have a smaller pressure loss, that is, the fluid pressure drop between the valve inlet and the valve outlet is smaller.

[0064] The stop check valve of the present application has a simple structure and good applicability.

[0065] Although the present disclosure has been described in conjunction with the examples of the embodiments summarized above, it is obvious to those of ordinary skill in the art that various alternatives, modifications, variations, improvements and / or substantially equivalent solutions, whether known or now or foreseeable in the near future, may be apparent. Therefore, the examples of the embodiments of the present disclosure as stated above are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to include all known or earlier developed alternatives, modifications, variations, improvements and / or substantially equivalent solutions. The technical effects and technical problems in this specification are exemplary rather than restrictive. It should be noted that the embodiments described in this specification may have other technical effects and may solve other technical problems.

Claims

1. A stop check valve, characterized in that include: A valve body (101), wherein a fluid passage (108) is defined in the valve body (101); A valve flap (110), wherein the valve flap (110) is disposed in the fluid channel (108), and the valve flap (110) has a rotatable state and a non-rotatable state; as well as A locking mechanism (120) is arranged in the fluid channel (108) and has a locking position and a releasing position. The locking mechanism (120) is configured to lock the valve flap (110) to keep it in a non-rotatable state when the locking mechanism (120) is in the locking position, and to release the valve flap (110) to allow it to rotate when the locking mechanism (120) is in the releasing position.

2. The stop check valve according to claim 1, characterized in that: The valve body (101) has a valve inlet (102) and a valve outlet (103), and the valve inlet (102) and the valve outlet (103) are fluidically connected through the fluid channel (108); The valve flap (110) has a valve flap open position and a valve flap closed position, wherein when the valve flap (110) is in a rotatable state, the valve flap (110) rotates between the valve flap open position and the valve flap closed position based on the pressure difference between the valve inlet (102) and the valve outlet (103) to allow the fluid to flow from the valve inlet (102) to the valve outlet (103) in a unidirectional manner through the fluid channel (108); Furthermore, when the valve flap (110) is in a non-rotatable state, the valve flap (110) is located in the valve flap closed position.

3. The stop check valve according to claim 2, characterized in that: The locking mechanism (120) is arranged on the rear side of the valve flap (110); The valve body (101) has a limiting portion (305), and the limiting portion (305) is located at the front side of the valve flap (110); When the locking mechanism (120) is in the locking position, the locking mechanism (120) abuts against the valve flap (110), so that the limiting portion (305) and the locking mechanism (120) jointly maintain the valve flap (110) in the valve flap closed position and restrict the valve flap (110) from rotating.

4. The stop check valve according to claim 3, characterized in that: The stop check valve (100) comprises a valve disc sealing ring (118), wherein the valve disc sealing ring (118) is arranged on the limiting portion (305) or the valve disc (110), so that when the valve disc (110) is located at the valve disc closed position, the valve disc sealing ring (118) is sealingly connected between the limiting portion (305) and the valve disc (110).

5. The stop check valve according to claim 4, characterized in that: The locking mechanism (120) also has an intermediate position and a first movement stroke and a second movement stroke. The locking mechanism (120) is configured to reach the intermediate position after performing a rotational movement from the release position in the first movement stroke, and then perform a linear movement from the intermediate position in the second movement stroke until reaching the locking position.

6. The stop check valve according to claim 5, characterized in that Also includes: Valve shaft (128); The valve flap (110) is connected to the valve shaft (128) and is configured to rotate around the valve shaft (128) between the valve flap open position and the valve flap closed position; The locking mechanism (120) includes an elongated hole (224), the valve shaft (128) passes through the elongated hole (224), and the locking mechanism (120) is configured to perform rotational motion around the valve shaft (128) in the first movement stroke, and to perform linear motion along the elongated hole (224) relative to the valve shaft (128) in the second movement stroke.

7. The stop check valve according to claim 6, characterized in that: The locking mechanism (120) further comprises an elastic component (225), wherein the elastic component (225) is arranged in the elongated hole (224) and is configured to apply a pre-tightening force along the length direction of the elongated hole (224) to the valve shaft (128).

8. The stop check valve according to claim 7, characterized in that: The locking mechanism (120) further includes a slider (226), which is disposed in the elongated hole (224) and located between the elastic component (225) and the valve shaft (128), the top of the slider (226) abuts against the elastic component (225), and the bottom of the slider (226) includes a notch (229) for accommodating the valve shaft (128).

9. The stop check valve according to claim 8, characterized in that: The locking mechanism (120) further comprises a valve stem (121), wherein the valve stem (121) is capable of abutting against the valve flap (110); and A connecting block (122), wherein the connecting block (122) is connected above the valve stem (121), and the valve stem (121) and the connecting block (122) move together, wherein the elongated hole (224) is arranged in the connecting block (122).

10. The stop check valve according to claim 9, characterized in that: The inner wall of the valve body (101) has a limiting hole (306), and the limiting hole (306) extends in the radial direction; The limiting hole (306) is configured such that when the locking mechanism (120) is in the second movement stroke, the bottom end of the valve stem (121) is at least partially inserted into the limiting hole (306).

11. The stop check valve according to claim 10, characterized in that: The valve flap (110) comprises: a plate portion (111); a protrusion (115), the protrusion (115) being disposed on the rear side of the disk portion (111), the protrusion (115) being configured to abut against a valve stem (121) of the locking mechanism (120); and A connecting rod (112), wherein the connecting rod (112) connects the protruding portion (115) and the valve shaft (128), so that the rotation of the valve shaft (128) can drive the valve flap (110) to rotate.

12. The stop check valve according to claim 11, characterized in that: The bottom end of the valve stem (121) has an inclined surface (123), and the inclined surface (123) extends obliquely from top to bottom and forward; The locking mechanism (120) is configured such that, when the locking mechanism (120) reaches its locking position, the inclined surface (123) contacts the top of the hole wall of the limiting hole (306), so that the valve flap sealing ring (118) presses the limiting portion (305) of the valve body (101) and the valve flap (110).

13. The stop check valve according to claim 9, characterized in that Also includes: a hand wheel device (150, 450, 550), the hand wheel device (150, 450, 550) being connected to the valve body (101) and at least partially located outside the fluid passage (108), the hand wheel device (150, 450, 550) being rotatable; and A transmission mechanism (160, 460, 560) is located in the fluid channel (108) and is transmission-connected to the hand wheel device (150, 450, 550) and the connecting block (122) of the locking mechanism (120), so as to drive the locking mechanism (120) to move through the rotation of the hand wheel device (150, 450, 550).

14. The stop check valve according to claim 13, characterized in that: The transmission mechanism (160, 460, 560) comprises a hand wheel tooth portion (264, 464, 564) and a locking mechanism tooth portion (263, 463, 563) that mesh with each other, the hand wheel tooth portion (264, 464, 564) being arranged on the hand wheel device (150, 450, 550), and the locking mechanism tooth portion (263, 463, 563) being arranged on a connecting block (122) of the locking mechanism (120).

15. The stop check valve according to claim 14, characterized in that: The hand wheel tooth portion (264, 464, 564) and the locking mechanism tooth portion (263, 463, 563) are configured to drive the locking mechanism tooth portion (263, 463, 563) to move through the rotational movement, lifting movement or spiral movement of the hand wheel tooth portion (264, 464, 564).

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