Double-hinge opening type parallel flap gate valve

Abstract

The utility model belongs to the technical field of valves, and discloses a double-hinge opening type parallel clack gate valve which comprises a valve body, a valve seat, valve clacks, a clamping ring, a valve rod and a supporting block. The valve seats are symmetrically arranged on the two sides in the valve body in pairs. The valve clacks are symmetrically arranged between the valve seats on the two sides in pairs; arc-shaped grooves are formed in the inner side faces of the valve clacks on the two sides, and hinges are arranged in the two grooves respectively. The outer ends of the two hinges are rotationally connected into the two grooves respectively, and the inner ends of the two hinges make contact with each other. The valve clacks on the two sides and the two hinges are all installed in the clamping ring. The valve rod is connected with the clamping ring and used for driving the clamping ring and the valve clacks on the two sides to move to open and close the gate valve. The supporting block is arranged below the valve clack and the clamping ring; the thermal locking condition can be avoided, the full-stroke dry friction between the valve clack and the valve seat is eliminated, and the service life of the sealing face of the valve is prolonged. No spring is needed, and dependence on spring performance is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a double-hinge expansion type parallel flap gate valve. Background Art

[0002] Traditional gate valves typically utilize a wedge-type disc. This type of valve features a simple structure and reliable sealing, but requires high precision in the sealing surface angle, is difficult to manufacture and maintain, and is more likely to cause the disc to wed when temperatures rise. When operating at temperatures exceeding 480°C, the wedge-type disc can experience thermal lock (wedging), preventing the valve from opening properly. The greatest advantage of a parallel-type disc is that it is unaffected by thermal expansion, effectively preventing thermal lock in high-temperature conditions and ensuring reliable operational safety. Furthermore, with the continuous development of the power industry and technological advancements, rapid valve opening and closing is increasingly required in many applications. This necessitates faster output speeds for electric actuators. While maintaining constant motor power, increased speed inevitably results in decreased output torque, necessitating lower operating torque for faster actuation. Parallel-type gate valves have significantly lower operating torque than wedge-type structures, facilitating rapid valve opening and closing.

[0003] Existing parallel-flap gate valves typically utilize a single-spring or multi-spring expansion structure, using either a helical compression spring or a disc spring. This spring-expanded parallel-flap gate valve requires one or more springs installed between the two valve discs, leveraging the spring tension to propel the discs apart and compress the valve seat. This complex structure requires the installation of locating pins to prevent the discs from rotating. Furthermore, because the spring constantly presses the disc against the valve seat, dry friction occurs on the sealing surface during valve opening and closing, severely impacting its service life. Furthermore, the springs place high demands on performance, making them susceptible to aging and failure under high-temperature conditions. Utility Model Content

[0004] The utility model provides a double-hinged, expanded parallel disc gate valve, which solves the problems of the prior art such as easy occurrence of thermal locking, dry friction between the valve disc and the valve seat throughout the entire stroke, the need to install a spring, and reliance on spring performance. It is beneficial to avoid the occurrence of thermal locking, eliminate dry friction between the valve disc and the valve seat throughout the entire stroke, and increase the service life of the valve sealing surface; and there is no need to install a spring, avoiding reliance on spring performance.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model provides a double-hinged, expanded-type parallel-flap gate valve, comprising a valve body, a valve seat, a valve flap, a clamping ring, a valve stem and a support block, wherein a cavity is arranged inside the valve body; the valve seats are arranged in pairs and symmetrically on both sides of the valve body; the valve flaps are arranged in pairs and symmetrically between the valve seats on both sides; the inner side surfaces of the valve flaps on both sides are provided with arc-shaped grooves, and hinges are respectively arranged in the two grooves; the outer ends of the two hinges are respectively rotatably connected in the two grooves, and the inner ends are in contact with each other; the valve flaps on both sides and the two hinges are installed in the clamping ring; the valve stem is connected to the clamping ring for driving the clamping ring and the valve flaps on both sides to move, so as to open and close the gate valve; the support block is arranged below the valve flap and the clamping ring.

[0007] The double-hinge, open-type parallel-flap gate valve provided by the present invention uses two hinges to replace the springs in the existing structure. An arc-shaped groove is processed on the inner side of the valve flap, and the hinge is flexibly connected to the valve flap so that the hinge can rotate in the groove. The valve flaps on both sides are installed in the clamping ring together with the hinge, and the two hinges touch each other and rise. When the valve stem drives the clamping ring to move downward, it can press the touching ends of the two hinges, so that the valve flap moves to both sides to press the valve seat. Since the valve flaps on both sides can provide forced sealing force to the valve seat, the effect of simultaneous sealing of the sealing surfaces on both sides can be achieved.

[0008] Preferably, the double-hinge expansion parallel flap gate valve provided by the present invention has the inner ends of the two hinges raised upward and in contact with each other, so that the two hinges are tilted to form an inverted V shape.

[0009] A gap is provided between the valve flap and the clamping ring and the support block.

[0010] A square center hole is provided in the clamping ring, and the hinge connected to the valve disc is installed in the center hole.

[0011] Preferably, in the double-hinge expansion parallel flap gate valve provided by the present invention, the outer ends of the hinges are both configured as arc-shaped edges.

[0012] The curvature radius of the arc-shaped edge is smaller than the curvature radius of the groove.

[0013] The outer ends of the hinges are rotatably connected in the two grooves through cylindrical pins.

[0014] The valve stem is connected to the clamping ring through a connecting pin; the top of the valve body is connected to the valve cover, and a sealing ring, a gasket, a four-open ring and a support plate are arranged between the valve body and the valve cover from bottom to top; the valve cover is provided with a valve cover through-hole, and the valve stem passes through the valve cover through-hole; a packing pad, a packing, a packing sleeve and a packing pressure plate are arranged between the top of the valve cover and the valve stem from bottom to top, and the packing pressure plate is connected to the valve cover; a bracket is connected to the top of the valve cover, and the bracket is provided with a bracket through-hole; the valve stem extends into the bracket through-hole, and a valve stem nut is sleeved and connected to the top; the top of the bracket is connected to the valve stem nut through a bearing, and a bearing pressure cover is provided on the top of the bearing, and the bearing pressure cover is connected to the top of the bracket.

[0015] The double-hinged parallel flap gate valve of the utility model can achieve the following beneficial effects:

[0016] 1. The double-hinged, expanded parallel-flap gate valve of the present invention improves upon the expansion structure and method of existing parallel-flap gate valves by eliminating the spring mechanism. The double-hinged expansion structure and method utilizes the thrust of the valve stem to compress the double hinges, which push the valve discs to both sides and compress the valve seats, thereby providing a forced sealing force on both valve seats and achieving simultaneous sealing of the sealing surfaces on both sides. When the valve needs to be opened, the valve stem is lifted, releasing the compression force on the double hinges, driving the clamping ring upward to remove the compression force on the contacting ends of the two hinges. The squeeze between the valve disc and the valve seat is loosened, and the expansion force of the parallel discs disappears. This not only avoids the occurrence of thermal locking but also eliminates dry friction between the valve disc and the valve seat throughout its entire travel, thereby improving the service life of the valve sealing surface. Furthermore, since this expansion method does not require the installation of a spring, it avoids reliance on spring performance.

[0017] 2. In the double-hinge expansion parallel disc gate valve of the present invention, the center hole of the clamp ring can be set as a square hole, so that the hinge and the valve disc cannot rotate freely after being assembled with the clamp ring, so the anti-rotation pin can be omitted, simplifying the structure of the parallel disc gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 This is a structural schematic diagram of a double-hinged, open parallel-flap gate valve provided in one embodiment of the present invention.

[0020] Figure 2 This is a front cross-sectional view of the valve disc of a double-hinged, expanded parallel-disc gate valve provided in one embodiment of the present invention.

[0021] Figure 3 for Figure 2 Right side view of the disc shown.

[0022] Figure 4 This is a front view of the hinge of a double-hinge expansion parallel flap gate valve provided in one embodiment of the present utility model.

[0023] Figure 5 A top cross-sectional view of the hinge of a double-hinge expansion parallel flap gate valve provided in one embodiment of the present invention.

[0024] Figure 6 This is a front cross-sectional view of the clamping ring of a double-hinged, expanded parallel flap gate valve provided in one embodiment of the present invention.

[0025] Figure 7 A side view of the clamping ring of a double-hinged, open parallel flap gate valve provided in accordance with one embodiment of the present invention.

[0026] Figure 8 A top view of the clamping ring of a double-hinged, open parallel-flap gate valve provided in accordance with one embodiment of the present invention.

[0027] In the figure, 1 is the valve body, 2 is the valve seat, 3 is the valve disc, 4 is the clamping ring, 401 is the countersunk hole, 402 is the boss, 5 is the support block, 6 is the groove, 301 is the cylindrical pin, 302 is the hinge, 7 is the center hole, 8 is the connecting pin, 9 is the valve stem, 10 is the valve cover, 11 is the sealing ring, 12 is the gasket, 13 is the four-open ring, 14 is the support plate, 15 is the bracket, 16 is the packing pad, 17 is the packing, 18 is the packing sleeve, 19 is the packing pressure plate, 20 is the valve stem nut, 21 is the bearing, and 22 is the bearing cover. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0029] The technical solutions provided by various embodiments of the present invention are described in detail below with reference to the accompanying drawings. Example

[0030] Please refer to Figures 1 to 8, a double-hinge open parallel flap gate valve, comprising a valve body 1, a valve seat 2, a valve disc 3, a clamping ring 4, a valve stem 9 and a support block 5. A cavity is arranged inside the valve body 1; the valve seats 2 are arranged in pairs and symmetrically on both sides of the valve body 1; the valve discs 3 are arranged in pairs and symmetrically between the valve seats 2 on both sides; the inner side surfaces of the valve discs 3 on both sides are provided with arc-shaped grooves 6, and hinges 302 are respectively provided in the two grooves 6; the outer ends of the two hinges 302 are respectively rotatably connected to the two grooves 6, and the inner ends are in contact with each other; the valve discs 3 on both sides and the two hinges 302 are all installed in the clamping ring 4; the valve stem 9 is connected to the clamping ring 4, and is used to drive the clamping ring 4 and the valve discs 3 on both sides to move, so as to realize the opening and closing of the gate valve; the support block 5 is arranged below the valve disc 3 and the clamping ring 4.

[0031] The installation of the double-hinged parallel flap gate valve of this embodiment may include the following steps:

[0032] The two hinges 302 are rotatably connected to the grooves 6 of the two valve flaps 3 respectively;

[0033] Install the two valve flaps 3 together with the two hinges 302 into the clamp ring 4 so that the inner ends of the two hinges 302 touch in the center hole 7 of the clamp ring 4 and the two hinges 302 are tilted to form an inverted V shape;

[0034] Install the clamping ring 4 together with two valve flaps 3 respectively equipped with hinges 302 between the two valve seats 2, and set a gap between the valve flap 3 and the clamping ring 4 and the support block 5, and the gap between the valve flap 3 and the support block 5 is smaller than the gap between the clamping ring 4 and the support block 5.

[0035] like Figure 1 As shown, in the double-hinged, open-type parallel-flap gate valve of this embodiment, when the valve is closed, the valve disc 3 gradually moves downward under the push of the valve stem 9 and the clamping ring 4 until the valve disc 3 contacts the support block 5 and stops moving vertically. At this time, there is still a gap δ between the bottom of the clamping ring 4 and the support block 5, and the valve stem 9 can drive the clamping ring 4 to continue to move downward. At this time, the contact ends of the two hinges 302 are pushed to the sides due to pressure, and the two valve discs 3 are pushed to press against the valve seat 2. Because the valve discs 3 on both sides can provide a forced sealing force on the valve seat 2, it is possible to achieve simultaneous sealing of the sealing surfaces on both sides. When the valve is opened, the valve stem 9 drives the clamping ring 4 upward, thereby removing the pressing force on the contact ends of the two hinges 302, causing the extrusion between the valve disc 3 and the valve seat 2 to loosen, which can effectively reduce the dry friction between the sealing surfaces.

[0036] like Figure 1As shown, in this embodiment of a double-hinged, open-type parallel-flap gate valve, the support block 5 can be extended to both sides to the bottom of the valve disc 3. The inner ends of the two hinges 302 can be raised and contacted, causing the two hinges 302 to tilt and form an inverted V-shape. The inner ends are located closer to the vertical center axis of the valve stem 9. A gap can be provided between the valve disc 3 and the clamping ring 4 and the support block 5, and the gap between the valve disc 3 and the support block 5 is smaller than the gap between the clamping ring 4 and the support block 5.

[0037] like Figure 1 、 Figure 6 and Figure 7 As shown, in some embodiments, a square central hole 7 is provided in the clamping ring 4 , and a hinge 302 connected to the valve disc 3 is installed in the central hole 7 .

[0038] When installing the valve flap, the hinge 302 connected to the valve flap 3 is installed in the central hole 7 .

[0039] Since the center hole 7 of the clamp ring 4 is set as a rectangular hole, specifically can be set as a square hole, the hinge 302 installed in the center hole 7 together with the valve disc 3 cannot rotate freely, thereby eliminating the anti-rotation pin and simplifying the structure of the parallel disc gate valve.

[0040] The clamping ring 4 has counterbores 401 on each side, with a through-hole 7 defined between the counterbores 401. The counterbores 401 can be circular. Bosses 402 can be provided on each side of the clamping ring 4, surrounding the counterbores 401. These bosses 402 can be circular. The counterbores 401 and bosses 402 ensure a secure fit between the clamping ring 4 and the valve discs 3 on either side. The hinge 302 is mounted in the square center hole 7 of the clamping ring 4, while the valve disc 3 is mounted in the circular counterbores 401 of the clamping ring 4.

[0041] like Figure 1 and Figure 4 As shown, in some embodiments, the outer ends of the hinges 302 are configured as arc-shaped edges to prevent damage between the outer ends of the hinges 302 and the inner surface of the groove 6.

[0042] The outer ends of the hinges 302 can be configured as raised arc edges. The inner ends of the hinges 302 are contact ends, and can also be configured as raised arc edges to prevent the contact ends of the two hinges 302 from being damaged.

[0043] like Figure 1 As shown, the curvature radius of the arcuate edge can be specifically smaller than the curvature radius of the groove 6 , so as to facilitate the outer end of the hinge 302 to rotate in the groove 6 and avoid the hinge 302 from getting stuck when rotating in the groove 6 .

[0044] The rotation angle of the hinge 302 around the cylindrical pin 301 in the groove 6 can be set to 10-15° or 10-20°.

[0045] Specifically, the outer ends of the hinge 302 are rotatably connected to the two grooves 6 through the cylindrical pins 301 respectively, so that the outer ends of the hinge 302 are rotatably connected to the grooves 6.

[0046] Specifically, the valve stem 9 is connected to the clamp ring 4 via a connecting pin 8;

[0047] The top of the valve body 1 is connected to the valve cover 10, and a sealing ring 11, a gasket 12, a four-open ring 13 and a support plate 14 are arranged between the valve body 1 and the valve cover 10 from bottom to top;

[0048] The valve cover 10 is provided with a valve cover through-hole, through which the valve stem 9 passes; a packing pad 16, a packing 17, a packing gland 18 and a packing pressure plate 19 are sequentially arranged between the top of the valve cover 10 and the valve stem 9 from bottom to top, and the packing pressure plate 19 is connected to the valve cover 10;

[0049] A bracket 15 is connected to the top of the valve cover 10, and the bracket 15 is provided with a bracket through-hole; the valve stem 9 extends into the bracket through-hole, and a valve stem nut 20 is sleeved and connected to the top; the top of the bracket 15 is connected to the valve stem nut 20 through a bearing 21, and a bearing cover 22 is provided on the top of the bearing 21, and the bearing cover 22 is connected to the top of the bracket 15.

[0050] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A double-hinged parallel flap gate valve, characterized in that: include: a valve body, wherein a cavity is provided inside the valve body; Valve seats are arranged in pairs and symmetrically on both sides of the valve body; The valve flaps are symmetrically arranged in pairs between the valve seats on both sides; the inner sides of the valve flaps on both sides are provided with arc-shaped grooves, and the two grooves are respectively provided with hinges; the outer ends of the two hinges are respectively rotatably connected to the two grooves, and the inner ends are in contact with each other; a clamping ring, in which the valve flaps on both sides and the two hinges are mounted; A valve stem connected to the clamping ring, used to drive the clamping ring and the valve discs on both sides to move, thereby opening and closing the gate valve; The support block is arranged below the valve disc and the clamping ring.

2. The double-hinged parallel flap gate valve according to claim 1, characterized in that: The inner ends of the two hinges are raised upward and contact each other, so that the two hinges are tilted to form an inverted V shape.

3. The double-hinged parallel flap gate valve according to claim 2, characterized in that: A gap is provided between the valve flap and the clamping ring and the support block.

4. The double-hinged parallel flap gate valve according to claim 1, characterized in that: A square center hole is provided in the clamping ring, and the hinge connected to the valve disc is installed in the center hole.

5. The double-hinged parallel flap gate valve according to claim 1, characterized in that: The outer ends of the hinges are all configured as arc-shaped edges.

6. The double-hinged parallel flap gate valve according to claim 5, characterized in that: The curvature radius of the arc-shaped edge is smaller than the curvature radius of the groove.

7. The double-hinged parallel flap gate valve according to claim 1, characterized in that: The outer ends of the hinges are rotatably connected in the two grooves through cylindrical pins.

8. The double-hinged parallel flap gate valve according to any one of claims 1 to 7, characterized in that: The valve stem is connected to the clamp ring via a connecting pin; The top of the valve body is connected to the valve cover, and a sealing ring, a gasket, a four-open ring and a support plate are arranged between the valve body and the valve cover from bottom to top; The valve cover is provided with a valve cover through-hole, and the valve stem passes through the valve cover through-hole; a packing pad, a packing, a packing gland and a packing pressure plate are sequentially arranged between the top of the valve cover and the valve stem from bottom to top, and the packing pressure plate is connected to the valve cover; A bracket is connected to the top of the valve cover, and the bracket is provided with a bracket through-hole; the valve stem extends into the bracket through-hole, and a valve stem nut is sleeved and connected to the top; the top of the bracket is connected to the valve stem nut through a bearing, and a bearing pressure cover is provided on the top of the bearing, and the bearing pressure cover is connected to the top of the bracket.

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