Double-hinge opening type parallel flap gate valve and mounting method thereof

Abstract

The invention belongs to the technical field of valves, and discloses a double-hinge opening type parallel clack gate valve and an installation method thereof.The gate valve comprises a valve body, a valve seat, valve clacks, a clamping ring, a valve rod and a supporting block, and a cavity is formed in the valve body; 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 invention belongs to the technical field of valves and relates to a double-hinged open parallel flap gate valve and an installation method thereof. Background Art

[0002] Traditional gate valves usually use wedge-type valve discs. This type of gate valve is characterized by simple structure and reliable sealing, but it has high requirements for the accuracy of the sealing surface angle, is difficult to process and maintain, and is more likely to get wedged when the temperature rises. When the working temperature of the wedge-shaped gate exceeds 480°C, thermal locking (wedging) may occur, resulting in the valve being unable to open normally. The biggest advantage of the parallel valve disc is that it is not affected by thermal expansion, can effectively avoid thermal locking under high temperature conditions, and has reliable operational safety. In addition, with the continuous development and technological progress of the power industry, the requirement for rapid opening and closing of valves is put forward in many occasions, which requires the electric actuator to have a faster output speed; when the motor power remains unchanged, the increase in speed will inevitably lead to a decrease in output torque, so the valve is required to have a smaller operating torque to obtain a faster action speed, and the operating torque of the parallel disc gate valve is significantly lower than that of the wedge structure, which is conducive to the rapid opening and closing of the valve.

[0003] Existing parallel flap gate valves usually adopt a single spring opening type or a multi-spring opening type structure, and the spring can use a spiral compression spring or a disc spring. This spring-opening parallel flap gate valve requires one or more springs to be installed between the two valve flaps, and the two valve flaps are opened with the help of the tension of the spring to press the valve seat; this structure is relatively complex, and a positioning pin needs to be installed to prevent the valve flap from rotating; in addition, because the valve flap is always pressed against the valve seat under the action of the spring, when the valve is opened and closed, it causes dry friction on the sealing surface throughout the process, which seriously affects the service life of the sealing surface, and has high performance requirements for the spring. Under high temperature conditions, the spring is prone to aging and failure. Summary of the invention

[0004] The present invention provides a double-hinged open parallel-flap gate valve and an installation method thereof, which solve the problems existing in the prior art of easy occurrence of thermal locking conditions, full-stroke dry friction between the valve flap and the valve seat, the need to install a spring and reliance on spring performance, thereby helping to avoid the occurrence of thermal locking conditions, eliminate the full-stroke dry friction between the valve flap and the valve seat, and increase the service life of the valve sealing surface; and there is no need to install a spring, thus avoiding reliance on spring performance.

[0005] To achieve the above object, the present invention adopts the following technical solution: In the first aspect, the present invention provides a double-hinged open 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, and is used to drive 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.

[0006] In a second aspect, the present invention provides a method for installing the double-hinged parallel flap gate valve provided in the first aspect of the present invention, comprising the following steps: Installing hinges: Rotatingly connecting the two hinges to the grooves of the two valve flaps respectively; Installing the valve flaps: installing the two valve flaps together with the two hinges into the clamping ring, so that the inner ends of the two hinges are in contact in the center hole of the clamping ring, and the two hinges are tilted to form an inverted V shape; Install the clamping ring: install the clamping ring together with the two valve flaps respectively equipped with the hinges between the two valve seats, and make sure that there are gaps between the valve flap and the clamping ring and the support block, and the gap between the valve flap and the support block is smaller than the gap between the clamping ring and the support block.

[0007] The double-hinge expansion parallel flap gate valve provided by the present invention adopts 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 into the clamping ring together with the hinges, and the two hinges touch and lift each other. When the valve stem drives the clamping ring to move downward, the touching ends of the two hinges can be pressed, 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, in the double-hinge propped-open parallel flap gate valve provided by the present invention, the inner ends of the two hinges are lifted upward and in contact with each other, so that the two hinges are tilted to form an inverted V shape.

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

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

[0011] Preferably, in the installation method of the double-hinge expansion parallel flap gate valve provided by the present invention, when installing the valve flap, the hinge connected to the valve flap is installed in the center hole.

[0012] Preferably, in the double-hinge expansion parallel flap gate valve provided by the present invention, the outer ends of the hinges are both arranged as arc-shaped edges.

[0013] The curvature radius of the arc-shaped edge is smaller than the curvature radius of the groove.

[0014] The outer ends of the hinges are rotatably connected in the two grooves through cylindrical pins.

[0015] The valve stem is connected to the clamping ring through a connecting pin; a valve cover is connected to the top of the valve body, 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; a valve cover through-hole is provided on the valve cover, 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 arranged on the top of the bearing, and the bearing pressure cover is connected to the top of the bracket.

[0016] The double-hinged open parallel flap gate valve and the installation method thereof of the present invention can achieve the following beneficial effects: 1. The double-hinge expansion parallel flap gate valve of the present invention improves the expansion structure and method of the prior art parallel flap gate valve and eliminates the spring structure; it adopts a double-hinge expansion structure and method, uses the thrust of the valve stem to compress the double hinges, and the double hinges push the valve flaps to both sides to compress the valve seats, thereby providing a forced sealing force to the valve seats on both sides, thereby 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 to move upward to remove the compression force on the contact ends of the two hinges, and the extrusion between the valve flap and the valve seat is loosened. At this time, the expansion force of the parallel flap disappears, which not only avoids the occurrence of thermal locking, but also eliminates the full-stroke dry friction between the valve flap and the valve seat, which is beneficial to improving the service life of the valve sealing surface. In addition, since this expansion method does not require the installation of a spring, it avoids dependence on spring performance.

[0017] 2. In the double-hinge expansion parallel flap 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 flap cannot rotate freely after being assembled with the clamp ring, so the anti-rotation pin can be omitted, simplifying the structure of the parallel flap 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: Figure 1 A schematic structural diagram of a double-hinged open parallel flap gate valve provided in one embodiment of the present invention.

[0019] Figure 2 A front cross-sectional view of a valve disc of a double-hinged, open parallel-disc gate valve provided in accordance with an embodiment of the present invention.

[0020] Figure 3 for Figure 2 Right side view of the disc shown.

[0021] Figure 4 A front view of the hinge of a double-hinge expansion parallel flap gate valve provided in one embodiment of the present invention.

[0022] Figure 5 A top cross-sectional view of the hinge of a double-hinge expansion parallel flap gate valve provided in accordance with an embodiment of the present invention.

[0023] Figure 6 A front cross-sectional view of a clamping ring of a double-hinged open parallel flap gate valve provided in one embodiment of the present invention.

[0024] Figure 7 A side view of a clamping ring of a double-hinged open parallel flap gate valve provided in accordance with an embodiment of the present invention.

[0025] Figure 8 A top view of a clamping ring of a double-hinged open parallel flap gate valve provided in accordance with an embodiment of the present invention.

[0026] Fig. 9 A schematic flow chart of a method for installing a double-hinged, open parallel-flap gate valve according to an embodiment of the present invention.

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

[0028] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are 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 in conjunction with the accompanying drawings. Example

[0030] Please refer to Figures 1 to 8 A double-hinged open parallel flap gate valve comprises a valve body 1, a valve seat 2, a valve flap 3, a clamping ring 4, a valve stem 9 and a support block 5, wherein 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 flaps 3 are arranged in pairs and symmetrically between the valve seats 2 on both sides; arc-shaped grooves 6 are provided on the inner sides of the valve flaps 3 on both sides, and hinges 302 are respectively arranged in the two grooves 6; the outer ends of the two hinges 302 are respectively rotatably connected in the two grooves 6, and the inner ends are in contact with each other; the valve flaps 3 on both sides and the two hinges 302 are 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 flaps 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 flap 3 and the clamping ring 4.

[0031] Please refer to Figures 1 to 9 The double-hinged parallel flap gate valve of this embodiment may include the following steps during installation: Step S1, installing hinges: rotatably connecting the two hinges 302 to the grooves 6 of the two valve flaps 3 respectively; Step S2, installing the valve flaps: installing 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 are in contact in the central hole 7 of the clamp ring 4, and the two hinges 302 are tilted to form an inverted V shape; Step S3, installing the clamping ring: install the clamping ring 4 together with two valve flaps 3 respectively equipped with hinges 302 between the two valve seats 2, and make sure that there is 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.

[0032] like Figure 1As shown, in the double-hinged open parallel flap gate valve of this embodiment, when the valve is closed, under the push of the valve stem 9 and the clamp ring 4, the valve flap 3 gradually moves downward until the valve flap 3 contacts the support block 5 and stops moving in the vertical direction. At this time, there is still a gap δ between the bottom of the clamp ring 4 and the support block 5, and the valve stem 9 can drive the clamp ring 4 to continue to move downward. At this time, the contact ends of the two hinges 302 are pushed to both sides due to pressure, and push the two valve flaps 3 to press the valve seat 2. Since the valve flaps 3 on both sides can provide forced sealing force to 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 clamp ring 4 to move upward, thereby removing the pressing force on the contact ends of the two hinges 302, so that the extrusion between the valve flap 3 and the valve seat 2 is loosened, which can effectively reduce the dry friction between the sealing surfaces.

[0033] like Figure 1 As shown, in the double hinged open parallel flap gate valve of this embodiment, the support block 5 can be extended to both sides to the bottom of the valve flap 3. The inner ends of the two hinges 302 can be raised upward and contact each other, so that the two hinges 302 are tilted to form an inverted V shape. Among them, the inner end is close to the end of the vertical center axis of the valve stem 9. The valve flap 3 and the clamp ring 4 can be provided with a gap between the support block 5, and the gap between the valve flap 3 and the support block 5 is smaller than the gap between the clamp ring 4 and the support block 5.

[0034] like Figure 1 , Figure 6 and Figure 7 As shown, in some embodiments, a square central hole 7 is provided in the clamp ring 4 , and a hinge 302 connected to the valve flap 3 is installed in the central hole 7 .

[0035] In step S2 , when installing the valve flap, the hinge 302 connected to the valve flap 3 is installed in the central hole 7 .

[0036] Since the center hole 7 of the clamp ring 4 is set as a rectangular hole, specifically 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.

[0037] Countersunk holes 401 are respectively provided on the side surfaces of the clamp ring 4, and a through-hole type center hole 7 is provided between the countersunk holes 401 on both sides. The countersunk holes 401 can be set as round holes. Bosses 402 can be set on the side surfaces of the clamp ring 4 on both sides at the periphery of the countersunk holes 401, and the bosses 402 can be set as round. The countersunk holes 401 and the bosses 402 can help ensure that the clamp ring 4 and the valve flaps 3 on both sides are securely installed. The hinge 302 is installed in the square center hole 7 of the clamp ring 4, and the valve flap 3 is installed in the circular countersunk hole 401 of the clamp ring 4.

[0038] like Figure 1 and Figure 4As 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.

[0039] 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 be configured as raised arc edges to prevent the contact ends of the two hinges 302 from being damaged.

[0040] like Figure 1 As shown, specifically, the radius of curvature of the arc-shaped edge is smaller than the radius of curvature 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 .

[0041] 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°.

[0042] Specifically, the outer ends of the hinge 302 are rotatably connected in the two grooves 6 through the cylindrical pins 301 , so that the outer ends of the hinge 302 are rotatably connected in the grooves 6 .

[0043] Specifically, the valve stem 9 is connected to the clamp ring 4 via a connecting pin 8; The top of the valve body 1 is connected to a 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; The valve cover 10 is provided with a valve cover through-hole, and the valve stem 9 passes through the valve cover through-hole; a packing pad 16, a packing 17, a packing gland 18 and a packing pressure plate 19 are arranged in sequence from bottom to top between the top of the valve cover 10 and the valve stem 9, and the packing pressure plate 19 is connected to the valve cover 10; 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 pressure cover 22 is arranged on the top of the bearing 21, and the bearing pressure cover 22 is connected to the top of the bracket 15.

[0044] The above is only 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 modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in 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 arranged in pairs and symmetrically between the valve seats on both sides; the inner sides 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; A clamping ring, in which the valve flaps on both sides and the two hinges are installed; A valve stem connected to the clamp ring and used to drive the clamp ring and the valve discs on both sides to move, thereby opening and closing the gate valve; A support block is arranged below the valve flap 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 lifted 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 arranged between the valve flap and the clamping ring and the support block.

4. The double-hinged open parallel flap gate valve according to claim 1, characterized in that: A square center hole is arranged in the clamping ring, and the hinge connected to the valve flap 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 arranged as arc-shaped edges.

6. The double-hinged open 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 open 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 a 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 arranged in sequence from bottom to top between the top of the valve cover and the valve stem, 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 arranged on the top of the bearing, and the bearing pressure cover is connected to the top of the bracket.

9. The installation method of the double-hinged open parallel flap gate valve according to any one of claims 1 to 8, characterized in that: The following steps are involved: Installing hinges: Rotatingly connecting the two hinges to the grooves of the two valve flaps respectively; Installing the valve flaps: installing the two valve flaps together with the two hinges into the clamping ring, so that the inner ends of the two hinges are in contact in the center hole of the clamping ring, and the two hinges are tilted to form an inverted V shape; Install the clamping ring: install the clamping ring together with the two valve flaps respectively equipped with the hinges between the two valve seats, and make sure that there are gaps between the valve flap and the clamping ring and the support block, and the gap between the valve flap and the support block is smaller than the gap between the clamping ring and the support block.

10. The installation method of the double-hinged parallel flap gate valve according to claim 9, characterized in that: The center hole of the clamping ring is configured as a square hole; When installing the valve flap, the hinge connected to the valve flap is installed in the central hole.

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