A gate valve with online packing replacement

Abstract

The present invention relates to the field of valves, and particularly to a gate valve capable of replacing packing online. It mainly solves the problem of poor convenience in replacing the packing of gate valves in the prior art. It includes a valve body, a valve stem, a valve plate, a valve plate holder, a valve cover, a gland, packing, and a handwheel. The gland is locked on the valve cover. A cavity is formed among the valve stem, the valve cover, and the gland. The packing is filled in the cavity. The handwheel is arranged on the valve stem and located outside the valve body. External threads are provided on the valve stem and located inside the valve body. The valve plate holder is threadedly connected to the valve stem. The valve plate is arranged on the valve plate holder. A guiding assembly is provided between the valve plate and the valve body. An elastic sleeve is sleeved outside the valve plate. An elastic ring is sleeved on the valve stem. The elastic ring is integrally connected to the elastic sleeve. The lower end of the elastic ring abuts against the valve plate holder. A relief groove is provided on the valve cover and along the circumference of the valve stem. When the valve plate holder and the valve plate move to the uppermost end along the axial direction of the valve stem, the elastic ring is embedded in the relief groove.

Description

Technical Field

[0001] The present invention relates to the field of valves, and particularly to a gate valve capable of replacing packing online. Background Art

[0002] A gate valve has a closing member, i.e., a gate plate. The moving direction of the gate plate is perpendicular to the fluid direction. A gate valve can only be fully opened or fully closed, and cannot be used for regulation and throttling. During the opening and closing process of the gate valve, relative movement can occur between the handwheel and the valve stem. By rotating the handwheel to drive the valve stem to rotate, during this process, the longitudinal position of the handwheel does not change, the valve stem moves longitudinally, and drives the bottom gate plate to move up and down. To ensure the sealing performance of the gate valve, sealing packing is provided between the valve stem and the valve cover. However, the sealing packing is prone to wear and often needs to be replaced. Currently, when replacing the sealing packing, the main valve needs to be closed and the fluid in the pipeline needs to be emptied before the replacement operation can be carried out, resulting in poor replacement convenience. Summary of the Invention

[0003] Therefore, in view of the above problems, the present invention provides a gate valve capable of replacing packing online, which mainly solves the problem of poor convenience in replacing packing of gate valves in the prior art.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A gate valve capable of replacing packing online includes a valve body, a valve stem, a gate plate, a gate plate frame, a valve cover, a gland, packing, and a handwheel. The valve body has a flow channel, and the valve body is provided with an inlet, an outlet, and a mounting port that are respectively communicated with the flow channel. The valve cover is locked to the valve body by bolts and is located at the mounting port. The valve stem passes through the valve cover, and the gland is locked to the valve cover. A cavity is formed among the valve stem, the valve cover, and the gland, and the packing is filled in the cavity. The handwheel is arranged on the valve stem and is located outside the valve body. The valve stem is provided with an external thread inside the valve body. The gate plate frame is threadedly connected to the valve stem, and the gate plate is arranged on the gate plate frame. A guiding assembly is provided between the gate plate and the valve body. By rotating the valve stem, the gate plate frame and the gate plate move along the axial direction of the valve stem to realize the opening and closing of the flow channel. An elastic sleeve is sleeved outside the gate plate, and an elastic ring is sleeved on the valve stem. The elastic ring is integrally connected to the elastic sleeve. The lower end of the elastic ring abuts against the gate plate frame. A relief groove is provided on the valve cover along the circumference of the valve stem. When the gate plate frame and the gate plate move to the uppermost end along the axial direction of the valve stem, the elastic ring is embedded in the relief groove.

[0006] Further, a first conical surface is provided along the outer side of the elastic ring, and a second conical surface is provided on the side surface of the relief groove.

[0007] Further, the number of the gate plates is two. The two gate plates are arranged on the gate plate frame and are located on both axial sides of the flow channel. The two gate plates are distributed in a V-shaped structure.

[0008] Furthermore, the guide assembly includes a convex strip fixedly arranged on the valve plate and a guide groove arranged on the valve body and matching with the convex strip.

[0009] Furthermore, the valve plate frame includes a threaded sleeve threadedly connected to the valve stem, a mounting frame fixedly connected to the threaded sleeve, a support frame arranged at the lower end of the mounting frame, two support blocks arranged on the mounting frame and distributed on both sides of the axial direction of the flow channel, and a synchronization component connecting the support frame and the two support blocks to achieve synchronous movement.

[0010] Furthermore, a through groove is provided in the middle of the valve plate, the support blocks are distributed in the through groove, and the outer ends of the support blocks are against the inner surface of the elastic sleeve.

[0011] Furthermore, a convex ring is protruding outwardly from the elastic sleeve, an embedding groove is formed on the inner side of the convex ring, and the support block is embedded in the embedding groove.

[0012] Furthermore, the synchronization component includes a first guide sleeve vertically arranged on the mounting frame, a first guide rod axially slidable along the first guide sleeve, two second guide sleeves transversely arranged on the mounting frame, second guide rods axially slidable along the second guide sleeves, a first conical block arranged at the upper end of the first guide rod, and second conical blocks respectively arranged at the opposite ends of the two second guide rods, the support frame is arranged at the lower end of the first guide rod, and the two support blocks are respectively arranged at the free ends of the second guide rod.

[0013] Furthermore, a return spring is sleeved on the first guide rod and located between the support frame and the mounting frame.

[0014] By adopting the above-mentioned technical scheme, the beneficial effects of the present invention are as follows: the gate valve with replaceable packing online, when in use, drives the valve stem to rotate by turning the hand wheel, and through the threaded connection between the valve stem and the valve plate frame, the valve plate frame and the valve plate move along the axial direction of the valve stem to realize the opening and closing of the flow channel; when the packing is lost and leakage occurs, the valve stem is rotated to drive the valve plate frame to continue to rise, so that the elastic ring at the upper end of the elastic sleeve is embedded in the give way groove, thereby ensuring the sealing of the connection between the valve stem and the valve cover, realizing online replacement, eliminating the problem of closing the main gate and exhausting the air, and improving the convenience of replacement; and, through the provided guide component, the limiting and guiding functions of the valve plate are realized, and the operation of the valve plate is stabilized. At the same time, the elastic sleeve sleeved on the outside of the valve plate is used to seal the connection between the valve plate and the valve body. Compared with the previous gate plate structure, such a design can eliminate the setting of the valve seat and achieve a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a gate valve in a closed state according to an embodiment of the present invention;

[0016] Figure 2It is a schematic structural diagram of the gate valve in the open state in the embodiment of the present invention;

[0017] Figure 3 is Figure 2 a partial enlarged view of part A in

[0018] Figure 4 It is a schematic top view structure diagram of the gate valve in the embodiment of the present invention with the valve cover, gland, packing and handwheel omitted;

[0019] Figure 5 It is another schematic structural diagram of the valve plate, valve plate frame and elastic sleeve when the gate valve is in the open state in the embodiment of the present invention;

[0020] Figure 6 It is another schematic structural diagram of the valve plate, valve plate frame and elastic sleeve when the gate valve is in the closed state in the embodiment of the present invention;

[0021] Figure 7 It is another schematic structural diagram of the valve body, valve plate, valve plate frame and elastic sleeve when the gate valve is in the closed state in the embodiment of the invention. Detailed implementation manners

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation manners.

[0023] The embodiment of the present invention is as follows:

[0024] Referring to Figures 1 to 4 as shown, a gate valve capable of replacing packing online includes a valve body 1, a valve stem 2, a valve plate 3, a valve plate frame 4, a valve cover 5, a gland 6, packing 7 and a handwheel 8. The valve body 1 has a flow channel 101. An inlet 102, an outlet 103 and an installation port 104 which are respectively communicated with the flow channel 101 are provided on the valve body 1. The valve cover 5 is locked to the valve body 1 by bolts and is located at the installation port 104. The valve stem 2 penetrates through the valve cover 5. The gland 6 is locked to the valve cover 5. A cavity is formed among the valve stem 2, the valve cover 5 and the gland 6. The packing 7 is filled in the cavity. The handwheel 8 is arranged on the valve stem 2 and is located outside the valve body 1. An external thread 10 is provided on the valve stem 2 and is located inside the valve body 1. The valve plate frame 4 is threadedly connected to the valve stem 2. The valve plate 3 is arranged on the valve plate frame 4. A guiding component 9 is provided between the valve plate 3 and the valve body 1. By rotating the valve stem 2, the valve plate frame 4 and the valve plate 3 move along the axial direction of the valve stem 2 to realize the opening and closing of the flow channel 101. An elastic sleeve 11 is sleeved outside the valve plate 3. An elastic ring 12 is sleeved on the valve stem 2. The elastic ring 12 is integrally connected with the elastic sleeve 11. The lower end of the elastic ring 12 abuts against the valve plate frame 4. A relief groove 13 is provided on the valve cover 5 and is located on the periphery of the valve stem 2. When the valve plate frame 4 and the valve plate 3 move to the uppermost end along the axial direction of the valve stem 2, the elastic ring 12 is embedded in the relief groove 13.

[0025] For the gate valve with online replaceable packing, during use, by rotating the handwheel 8 to drive the valve stem 2 to rotate, and through the threaded connection between the valve stem 2 and the valve plate holder 4, the valve plate holder 4 and the valve plate 3 move along the axial direction of the valve stem 2 to realize the opening and closing of the flow channel 101. When the packing 7 is worn and leaks, rotate the valve stem 2 to drive the valve plate holder 4 to continue to lift, so that the elastic ring 12 at the upper end of the elastic sleeve 11 is embedded into the relief groove 13, thereby ensuring the seal at the connection between the valve stem 2 and the valve cover 5, realizing online replacement, eliminating the problems of closing the main valve and exhausting gas, and improving the convenience of replacement; and, through the arranged guiding component 9, the limiting and guiding effects of the valve plate 3 are realized, and the operation of the valve plate 3 is stabilized. At the same time, the elastic sleeve 11 sleeved outside the valve plate 3 is used to seal the connection between the valve plate 3 and the valve body 1. With such a design, compared with the conventional gate valve structure, the setting of the valve seat can be omitted, and at the same time, a good sealing effect can be achieved.

[0026] And, a first conical surface 120 is arranged along the outer side of the elastic ring 12, and a second conical surface 130 is arranged on the side surface of the relief groove 13. When rotating the valve stem 2 to drive the valve plate holder 4 to continue to lift and the elastic ring 12 at the upper end of the elastic sleeve 11 is embedded into the relief groove 13, through the extrusion setting of the first conical surface 120 of the elastic ring 12 and the second conical surface 130 of the relief groove 13, the sealing effect is improved; further, the inclination angle of the first conical surface 120 is smaller than the inclination angle of the second conical surface 130, so that the outer side edge of the relief groove 13 abuts against the first conical surface 120 of the elastic ring 12 preferentially, and through continuous extrusion, the elastic ring 12 is embedded into the relief groove 13, further improving the sealing effect.

[0027] In this embodiment, the number of the valve plates 3 is two. The two valve plates 3 are arranged on the valve plate holder 4 and are located on the axial two sides of the flow channel 101. The two valve plates 3 are distributed in a V-shaped structure. The guiding component 9 includes a rib 91 fixedly arranged on the valve plate 3 and a guide groove 92 arranged on the valve body 1 and matched with the rib 91, which improves the fixing strength of the valve plate 3 and the stability of operation, and improves the convenience of opening and closing the flow channel 101 through the valve plate 3.

[0028] And, the elastic sleeve 11 is clamped between the valve plate 3 and the rib 91. During the installation of the rib 91 by bolts, due to the elastic effect of the elastic sleeve 11, the installation firmness of the rib 91 is improved, the matching precision between the rib 91 and the guide groove 92 is improved, and the installation error is reduced.

[0029] It should be noted that refer to Figure 5 、 Figure 6 and Figure 7, the valve plate holder 4 includes a threaded sleeve 41 threadedly connected to the valve stem 2, a mounting bracket 42 fixedly connected to the threaded sleeve 41, a support bracket 43 provided at the lower end of the mounting bracket 42, two support blocks 44 provided on the mounting bracket 42 and distributed on both axial sides of the flow channel 101, and a synchronization assembly 45 connecting the support bracket 43 and the two support blocks 44 to achieve synchronous movement. A through groove 14 is provided in the middle of the valve plate 3, and the support blocks 44 are distributed at the through groove 14. The outer ends of the support blocks 44 abut against the inner surface of the elastic sleeve 11. Specifically, a convex ring 110 protrudes outward from the elastic sleeve 11, and an embedding groove 111 is formed inside the convex ring 110. The support block 44 is embedded in the embedding groove 111. And the synchronization assembly 45 includes a first guide sleeve 451 vertically provided on the mounting bracket 42, a first guide rod 452 slidable along the axial direction of the first guide sleeve 451, two second guide sleeves 453 horizontally provided on the mounting bracket 42, second guide rods 454 respectively slidable along the axial direction of the second guide sleeves 453, a first tapered block 455 provided at the upper end of the first guide rod 452, and second tapered blocks 456 respectively provided at the opposite ends of the two second guide rods 454. The support bracket 43 is provided at the lower end of the first guide rod 452, and the two support blocks 44 are respectively provided at the free ends of the second guide rods 454. A return spring 46 is sleeved on the first guide rod 452 between the support bracket 43 and the mounting bracket 42. The included angle between the valve plate 3 and the horizontal plane is greater than the included angle between the convex strip 91 and the horizontal plane.

[0030] In the process of the valve stem 2 driving the valve plate holder 4 and the valve plate 3 to move downward to close the flow channel 101, the convex strip 91 is embedded in the guide groove 92 and slides along the guide groove 92. Since the angle between the valve plate 3 and the horizontal plane is greater than the angle between the convex strip 91 and the horizontal plane, during the continuous downward movement of the valve plate 3, the extrusion force between the convex strip 91 and the guide groove 92 gradually increases. When closed, a hard connection is achieved. And the valve plate holder 4 continues to move downward, so that the support frame 43 abuts against the bottom of the flow channel 101. The valve plate holder 4 continues to squeeze the return spring 46 downward, causing the second conical block 456 to move upward relative to each other. Thus, through the cooperation with the first conical block 455, the two support blocks 44 move outward in opposite directions, pushing the elastic sleeve 11 to squeeze the upper edge of the valve body 1. At this time, when the valve plate holder 4 squeezes the return spring 46 downward, the support height of the elastic sleeve 11 decreases, it forms a contraction, its elasticity and softness increase, and the provided convex ring 110 is limited under the action of the support block 44, so that the upper part of the elastic sleeve 11 remains unchanged. Thus, the tension state between the lower part of the valve plate 3 and the lower part of the elastic sleeve 11 is reduced, enabling the side edge and the bottom end of the valve plate 3 to achieve a soft connection with the valve body 1, and through the extrusion hard connection between the convex strip 91 and the guide groove 92, a certain offset is achieved, thereby improving the sealing performance of the gate valve when closed. And the elasticity and softness of the lower part of the elastic sleeve 11 increase, which can clamp smaller impurities. Compared with the previous hard connection method, the problem of the gate valve not closing tightly caused by the clamping of impurities is avoided. In the process of the valve stem 2 driving the valve plate holder 4 and the valve plate 3 to move upward to open the flow channel 101, the support block 44 is reset under the action of the elastic sleeve 11 and the return spring 46, and the elastic sleeve 11 drives its lower part to form a tension state through the reset of the return spring 46, which is beneficial to the dropping of the impurities clamped on the elastic sleeve 11.

[0031] Further, a groove 15 is recessed on the valve body 1 and at the projection of the valve plate holder 4. The middle parts of the two valve plates 3 are hinged to the mounting frame 42, realizing a swing amplitude of 2° to 4°, preferably 3°. The distance between the lower edges of the two valve plates 3 is smaller than the width dimension of the groove 15, and the support frame 42 is of an arc structure. Designed in this way, combined with the technical feature that the two valve plates 3 are distributed in a V-shaped structure, when the valve plate holder 4 moves downward, the valve plates 3 are embedded in the groove 15. When the valve plate holder 4 continues to move downward, the upper edge of the groove 15 abuts against the valve plates 3 to cause them to swing. Then, through the extrusion hard connection between the convex strip 91 and the guide groove 92 and the elastic deformation effect of the elastic sleeve 11, a floating connection between the valve plates 3 and the valve body 1 is realized. And during the closing process, when the high-pressure water flow impacts the valve plates 3 to form a swing, it plays a certain guiding role, reducing the pressure acting on the valve plates 3 and improving the convenience of opening and closing the flow channel. And when closed, the high-pressure water flow impacts the valve plates 3 to form a slight floating, thereby adjusting the posture of the valve plates 3 and improving the sealing performance.

[0032] Although the present invention has been specifically shown and described in connection with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A gate valve with online replaceable packing, characterized in that: It includes a valve body, a valve stem, a valve plate, a valve plate holder, a valve cover, a gland, packing, and a handwheel. The valve body has a flow channel. The valve body is provided with an inlet, an outlet, and a mounting port that are respectively communicated with the flow channel. The valve cover is locked to the valve body by bolts and is located at the mounting port. The valve stem passes through the valve cover. The gland is locked to the valve cover. A cavity is formed among the valve stem, the valve cover, and the gland. The packing is filled in the cavity. The handwheel is arranged on the valve stem and is located outside the valve body. The valve stem is provided with an external thread inside the valve body. The valve plate holder is threadedly connected to the valve stem. The valve plate is arranged on the valve plate holder. A guiding component is arranged between the valve plate and the valve body. By rotating the valve stem, the valve plate holder and the valve plate move along the axial direction of the valve stem to open and close the flow channel. An elastic sleeve is sleeved outside the valve plate. An elastic ring is sleeved on the valve stem. The elastic ring is integrally connected to the elastic sleeve. The lower end of the elastic ring abuts against the valve plate holder. A relief groove is provided on the valve cover along the circumference of the valve stem. When the valve plate holder and the valve plate move to the uppermost end along the axial direction of the valve stem, the elastic ring is embedded in the relief groove; The valve plate holder includes a threaded sleeve threadedly connected to the valve stem, a mounting frame fixedly connected to the threaded sleeve, a support frame arranged at the lower end of the mounting frame, two support blocks arranged on the mounting frame and distributed on both sides of the axial direction of the flow channel, and a synchronization component connecting the support frame and the two support blocks to achieve synchronous movement; A through groove is provided in the middle of the valve plate. The support blocks are distributed at the through groove. The outer ends of the support blocks abut against the inner surface of the elastic sleeve. A convex ring protrudes outward from the elastic sleeve. An embedding groove is formed inside the convex ring. The support blocks are embedded in the embedding groove; The synchronization component includes a first guide sleeve arranged vertically on the mounting frame, a first guide rod slidable axially along the first guide sleeve, two second guide sleeves arranged horizontally on the mounting frame, second guide rods respectively slidable axially along the second guide sleeves, a first tapered block arranged at the upper end of the first guide rod, and second tapered blocks respectively arranged at the opposite ends of the two second guide rods. The support frame is arranged at the lower end of the first guide rod. The two support blocks are respectively arranged at the free ends of the second guide rods. A return spring is sleeved on the first guide rod between the support frame and the mounting frame.

2. The gate valve with online replaceable packing according to claim 1, characterized in that: A first tapered surface is provided along the outer side of the elastic ring. A second tapered surface is provided on the side surface of the relief groove.

3. The gate valve with online replaceable packing according to claim 1, characterized in that: The number of valve plates is two. The two valve plates are arranged on the valve plate holder and are located on both sides of the axial direction of the flow channel. The two valve plates are distributed in a V-shaped structure.

4. The gate valve with online replaceable packing according to any one of claims 1 to 3, characterized in that: The guiding component includes a convex strip fixedly arranged on the valve plate and a guide groove arranged on the valve body and matched with the convex strip.

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