Sealing gasket structure and special gate valve for yellow river water

Abstract

The present application relates to a kind of sealing gasket structure, including ring groove, split ring, sealing ring and sealing ring pressure ring;The thickness of split ring is less than the width of ring groove, split ring is installed at the groove bottom of ring groove, and is made of multiple sections, and split ring is abutted on the groove wall of ring groove.There is limiting portion for limiting split ring to move outward on the groove wall abutting with split ring;Sealing ring is abutted on the groove wall with limiting portion, the bottom of sealing ring is abutted on split ring, and the top is overflowed from the slot opening of ring groove;The two sides of the bottom of sealing ring pressure ring are respectively abutted on split ring and the groove wall away from limiting portion, and the middle part of sealing ring pressure ring is pressed on sealing ring and split ring.In addition, a special gate valve for Yellow River water is also provided.The above-mentioned sealing gasket structure and special gate valve for Yellow River water, split ring and sealing ring pressure ring are fixed, so that sealing ring can be firmly installed in valve seat ring groove, and is clamped and fixed by limiting portion located on the side wall of ring groove, to realize the quick and convenient disassembly of sealing gasket structure, and low use cost.

Description

Technical Field

[0001] This invention relates to the field of gate valve sealing, and in particular to a sealing gasket structure and a gate valve specifically designed for Yellow River water. Background Technology

[0002] The gate valve's opening and closing element is a gate, whose movement is perpendicular to the fluid direction. Gate valves can only be fully open or fully closed; they cannot be used for regulation or throttling. The gate has two sealing surfaces, the most common being a wedge shape formed by these surfaces. The wedge angle varies depending on the valve parameters, but is typically 5 degrees. The gate of a wedge gate valve can be made as a single piece, called a rigid gate; or it can be made to allow for slight deformation to improve manufacturability and compensate for deviations in the sealing surface angle during manufacturing. This type of gate is called a resilient gate. When a gate valve is closed, the sealing surface can be sealed solely by the medium pressure, meaning the medium pressure presses the gate's sealing surface against the valve seat on the other side to ensure a seal. This is called self-sealing. Most gate valves use forced sealing, meaning that when the valve is closed, external force is required to press the gate against the valve seat to ensure a tight seal. Gate valves where the gate moves linearly with the valve stem are called rising stem gate valves, also known as outside stem gate valves. Typically, the lifting rod has a trapezoidal thread, which, through the nut at the top of the valve and the guide groove on the valve body, converts the rotational motion into linear motion, that is, converts the operating torque into operating thrust. When the valve is opened, the fluid passage is completely unobstructed when the gate is raised to a height equal to the valve's nominal diameter.

[0003] Gate valves used in silty water conditions have various sealing structures, with hard seals and soft seals being the most common. Hard seals suffer from sand particles trapped on the sealing surface during gate opening and closing, causing wear and scratches. This necessitates replacing the entire valve during maintenance, resulting in higher operating costs. Soft seals, on the other hand, use a soft-seal seat and a hard gate. The seat is replaceable, improving sealing surface wear. However, flat gate valves lack wear compensation, requiring frequent seat replacements and still leading to high operating costs. Wedge gate valves, however, have wear compensation capabilities. Compared to flat gate valves, wedge gate valves are more difficult to install, fix, and replace. Therefore, a wedge gate valve with a replaceable seat has been lacking. This invention's seat structure effectively solves the problems of installing, fixing, and replacing wedge gate valve seats. It also overcomes the difficulty of drilling holes and fixing the seat with screws inside wedge gate valves. Summary of the Invention

[0004] Therefore, it is necessary to provide a sealing gasket structure that is easier to replace and has lower operating costs, as well as a gate valve specifically designed for Yellow River water, to address the aforementioned problems.

[0005] A sealing gasket structure comprises a ring groove, a split ring, a sealing ring and a sealing ring pressing ring; the thickness of the split ring is less than the width of the ring groove, the split ring is installed at the groove bottom of the ring groove and is composed of multiple segments, and the split ring abuts against the groove wall of the ring groove, the groove wall abutting against the split ring is provided with a limiting part for limiting the outward movement of the split ring; the sealing ring abuts against the groove wall provided with the limiting part, the bottom of the sealing ring abuts against the split ring, and the top of the sealing ring overflows the groove opening of the ring groove; the bottom of the sealing ring pressing ring abuts against the split ring and the groove wall away from the limiting part, the middle part of the sealing ring pressing ring is pressed on the sealing ring and the split ring, and the top end of the sealing ring pressing ring is lower than the overflowing end of the sealing ring; and the sealing ring pressing ring is fixed on the split ring.

[0006] Further, the split ring is composed of at least three segments, and adjacent segments are connected end to end to form a complete ring.

[0007] Further, the limiting part is an annular inner flange.

[0008] Further, the bottom of the sealing ring is clamped between the sealing ring pressing ring and the split ring.

[0009] Further, the inner side of the bottom of the sealing ring has a protruding part, and the sealing ring pressing ring is pressed on the protruding part.

[0010] Further, the sealing ring pressing ring is fixed on the split ring by a fastener.

[0011] Further, the fastener is a fastening screw, and the sealing ring pressing ring is an annular sealing ring pressing ring.

[0012] Further, the outer edge of the groove opening of the ring groove has a sunken platform, the top of the sealing ring has an annular outer flange extending outward, and the annular outer flange is supported on the sunken platform.

[0013] A special gate valve for Yellow River water comprises a valve seat and a gate plate, and further comprises the above sealing gasket structure, the ring groove is arranged on the sealing surface of the valve seat, and when the gate plate is closed, the gate plate extrudes the sealing gasket structure to complete sealing.

[0014] Further, the gate valve is provided as a wedge gate valve, and the sealing gasket structure of the gate valve is installed on the sealing surfaces on both sides of the valve seat.

[0015] The above sealing gasket structure and special gate valve for Yellow River water are fixed with the split ring and the sealing ring pressing ring, so that the sealing ring can be firmly installed in the ring groove of the valve seat and is clamped and fixed through the limiting part on the side wall of the ring groove, the sealing gasket structure is quickly and conveniently disassembled and assembled, and the use cost is low.

[0016] By using the replaceable sealing gasket structure as the seal, the replacement of the whole gate valve when using the hard seal is avoided, and the operation cost of the user is greatly reduced.

[0017] The replacement period is also prolonged by the damage compensation function of the sealing surface of the wedge gate valve. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the gate valve;

[0019] Figure 2 It is Figure 1 an enlarged view of the local part A;

[0020] Figure 3 It is Figure 2 a sectional view.

[0021] In the figure: 100, valve seat; 110, sealing surface; 120, limiting part; 200, split ring; 300, sealing ring; 400, sealing ring pressing ring; 500, gate plate. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] As Figure 1 , Figure 2 and Figure 3 shown, in one embodiment, a sealing gasket structure includes a ring groove, a split ring 200, a sealing ring 300 and a sealing ring pressing ring 400; the thickness of the split ring 200 is less than the width of the ring groove, the split ring 200 is installed at the groove bottom of the ring groove and is composed of multiple sections, and the split ring 200 abuts against the groove wall of the ring groove, the groove wall abutting against the split ring 200 is provided with a limiting part 120 for limiting the outward movement of the split ring 200; the sealing ring 300 abuts against the groove wall provided with the limiting part 120, the bottom of the sealing ring 300 abuts against the split ring 200, and the top of the sealing ring 300 overflows the groove opening of the ring groove; the two sides of the bottom of the sealing ring pressing ring 400 abut against the split ring 200 and the groove wall away from the limiting part 120 respectively, the middle part of the sealing ring pressing ring 400 is pressed on the sealing ring 300 and the split ring 200, and the top end of the sealing ring pressing ring 400 is lower than the overflowing end of the sealing ring 300; the sealing ring pressing ring 400 is fixed on the split ring 200.

[0024] In use, the split ring 200 is installed on the ring groove bottom, clamped between the limiting portion 120 and the ring groove bottom, the sealing ring 300 and the sealing ring pressing ring 400 are sequentially installed in the ring groove, and then the sealing ring pressing ring 400 and the split ring 200 are fixed together.

[0025] The sealing gasket structure is fixed by the split ring 200 and the sealing ring pressing ring 400, the sealing ring 300 can be firmly installed in the valve seat ring groove and clamped and fixed by the limiting portion 120 on the side wall of the ring groove, the sealing gasket structure is quickly and conveniently disassembled, and the use cost is low.

[0026] In the embodiment, the split ring 200 is composed of 3-5 segments, and adjacent segments are connected end to end to form a complete ring. Considering that the split ring has a certain rigidity, in order to facilitate smooth installation, the split ring 200 is divided into 3-5 segments, preferably 4 segments, for installation, and after installation, the adjacent segments are connected end to end, so that the split ring 200 is more stable.

[0027] In the embodiment, the limiting portion 120 is an annular inner flange. The inner flange ensures that the split ring 200 or the sealing ring 300 is closely attached to the limiting portion 120, and the installation is stable and accurate. In addition to the stable effect of the plurality of protrusions on the installed split ring 200 or sealing ring 300, the split ring 200 or sealing ring 300 is also convenient to disassemble and remove.

[0028] In the embodiment, the bottom of the sealing ring 300 is clamped between the sealing ring pressing ring 400 and the split ring 200. The inner side of the bottom of the sealing ring 300 has a protruding portion, and the sealing ring pressing ring 400 is pressed on the protruding portion. The sealing ring 300 is fixed in the ring groove and is not easy to loosen.

[0029] In the embodiment, one end of the sealing ring 300 protruding from the ring groove is provided with a circular arc surface or a corrugated arc surface, and both ends of the circular arc surface or the corrugated arc surface are located in the ring groove. Ensure smooth movement of external components when in contact with the sealing ring 300, and also increase the contact area of the sealing ring 300 and the external components.

[0030] In the embodiment, the sealing ring pressing ring 400 is fixed on the split ring 200 by a fastener. The fastener is a fastening screw. It is convenient to disassemble and remove, and does not need to punch holes on the gate valve body, and the use cost is low. The sealing ring pressing ring 400 is an annular sealing ring pressing ring.

[0031] In the embodiment, the outer edge of the slot of the ring groove has a sunken platform, the top of the sealing ring 300 has an annular outer flange extending outward, and the annular outer flange is supported on the sunken platform. Increase the contact area of the sealing ring 300, and keep the sealing ring 300 stable.

[0032] On the basis of the sealing gasket structure, the embodiment further proposes a gate valve special for the Yellow River water, which comprises a valve seat 100 and a gate plate 500, and further comprises the sealing gasket structure, and the ring groove is arranged on the sealing surface 110 of the valve seat 100, and the gate plate 500 is extruded to complete the sealing when the gate plate 500 is closed.

[0033] The gate valve special for the Yellow River water adopts the sealing gasket structure which can be replaced, so as to avoid replacing the whole gate valve when the hard sealing is used, and greatly reduce the operation cost of the user.

[0034] In the embodiment, the gate valve is provided as a wedge gate valve, and the sealing gasket structure is arranged on the sealing surface 110 on both sides of the valve seat 100.

[0035] When the gate plate 500 is inserted into the flow channel, the flow channel is blocked, and the sealing ring 300 is attached to the gate plate 500 to seal the flow channel; when the sealing ring 300 is worn, the position of the gate plate when the sealing is achieved is difficult to achieve the ideal sealing effect due to the wear of the sealing ring, and the flow channel which is originally blocked has a gap, at this time, the gate plate 500 can be further pushed in, so that the thicker position of the wedge-shaped gate plate replaces the original thinner position, and the gate plate further extrudes the sealing ring 300, so that the gate plate 500 is attached to the sealing ring 300 again to reseal the flow channel.

[0036] When the sealing ring 300 is worn, the gate plate 500 can be further pushed into the flow channel to be attached to the sealing ring 300 again to achieve wear compensation. The service life is prolonged, and when the compensation amount is used up, the sealing ring 300 can be replaced, and the valve seat 100 can be easily removed during replacement, which is very convenient.

[0037] The advantage of this structure is that the valve seat 100 does not need to be drilled and threaded, and only needs to be turned into a ring groove to firmly install the valve seat 100 assembly on the valve seat 100. Mainly due to the limitation of its structure, ordinary process cannot drill holes. Similarly, the valve seat 100 assembly is also easy to disassemble, and the valve seat 100 can be removed and replaced by loosening the screw.

[0038] The above-mentioned gate valve adopts a wedge structure and cooperates with the sealing ring 300 to have a sealing wear compensation function, so that the replacement period is longer than that of the flat plate gate valve. At the same time, since the wedge gate valve is shorter than the flat plate gate valve, it is more conducive to installation in a narrow space.

[0039] The wedge structure is mainly arranged to solve the difference problem that the flat plate structure cannot be compensated.

[0040] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A special gate valve for Yellow River water, comprising a valve seat and a gate plate, characterized in that, The device includes a sealing gasket structure comprising an annular groove, a split ring, a sealing ring, and a sealing ring retainer. The annular groove is disposed on the valve seat sealing surface. The thickness of the split ring is less than the width of the annular groove. The split ring is installed at the bottom of the annular groove and is composed of multiple segments. The split ring abuts against the groove wall of the annular groove. The groove wall abutting the split ring has a limiting portion for restricting the outward movement of the split ring; the limiting portion is an annular inner flange. The sealing ring abuts against the groove wall with the limiting portion. The bottom of the sealing ring abuts against the split ring, and the top overflows the opening of the annular groove. The bottom sides of the sealing ring retainer abut against... On the groove wall away from the limiting part, the middle part of the sealing ring pressure ring is pressed onto the sealing ring and the split ring, and the top end is lower than the overflow end of the sealing ring; the sealing ring pressure ring is fixed on the split ring; the bottom of the sealing ring is engaged between the sealing ring pressure ring and the split ring; the inner side of the bottom of the sealing ring has a protrusion, and the sealing ring pressure ring is pressed onto the protrusion; when the gate is closed, the gate squeezes the sealing gasket structure to complete the seal; the outer edge of the groove opening of the ring groove has a countersunk platform, and the top of the sealing ring has an annular outer flange extending outward, and the annular outer flange is supported on the countersunk platform.

2. The special gate valve for Yellow River water according to claim 1, characterized in that, The cut ring consists of at least three segments, with adjacent segments joined end to end to form a complete ring.

3. The special gate valve for Yellow River water according to claim 1, characterized in that, The sealing ring pressure ring is fixed to the split ring by fasteners.

4. The special gate valve for Yellow River water according to claim 3, characterized in that, The fastener is a fastening screw, and the pressure ring is annular.

5. The special gate valve for Yellow River water according to claim 1, characterized in that, The gate valve is configured as a wedge gate valve, and the gate valve sealing gasket structure is installed on both sealing surfaces on the valve seat.

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