Elastic compensation sealing knife type gate valve

Abstract

The utility model relates to the technical field of knife type gate valves, in particular to an elastic compensation sealing knife type gate valve which comprises two groups of flange plates, a valve body is installed between the two groups of flange plates in a penetrating mode, a plate body mechanism is arranged on one side outside the valve body, and two groups of rubber sealing gaskets are installed in the valve body in an embedded mode. Magnetic attraction materials are integrated at the two ends of the rubber sealing gaskets and are annularly arranged, the two sets of rubber sealing gaskets are subjected to opposite-polarity attraction in the valve body so that the rubber sealing gaskets can be tightly attached after deformation, connecting holes are formed in the sides, close to the valve body, of the flange plates correspondingly, and clamping grooves are formed in the penetrating positions of the flange plates and the valve body correspondingly. Sealing plates are respectively mounted in the clamping grooves through bolts, and the two groups of rubber sealing gaskets are extruded and fixed; dynamic compensation of a sealing interface is achieved through the integrated design of a magnetic attraction material and a rubber sealing gasket, the sealing reliability under the high-pressure and high-abrasion working condition is improved, meanwhile, rapid replacement of assemblies is achieved through a modularized detachable structure, and the maintenance cost and the downtime are reduced.

Description

Technical Field

[0001] This utility model relates to the field of knife gate valve technology, specifically a knife gate valve with elastically compensated sealing. Background Technology

[0002] Knife gate valves are shut-off valves that use a blade-shaped gate. The gate cuts into the sealing surface like a blade during vertical movement to cut off the medium. With its compact structure and self-cleaning sealing surface, it is particularly suitable for handling harsh working conditions containing solid particles, high viscosity, or fibrous media (such as mud, dust, etc.). It can achieve reliable fluid control in high-wear and highly corrosive environments, effectively preventing medium leakage and valve jamming. It is widely used in industrial fields such as mining, sewage treatment, and chemical industry that require high-reliability fluid shut-off.

[0003] However, traditional knife gate valves rely on a single mechanical clamping force to maintain the seal. Long-term pressure can easily lead to plastic deformation of the sealing gasket, and instantaneous leakage is likely to occur when the medium pressure drops suddenly. In addition, conventional sealing structures cannot effectively block external contaminants when the gate is open. Dust or particulate matter can easily intrude and cause scratches on the sealing surface, leading to an increased risk of seal failure. Utility Model Content

[0004] The purpose of this invention is to provide a knife gate valve with elastically compensated sealing to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A knife gate valve with elastic compensation sealing includes two sets of flanges, with a valve body installed through the two sets of flanges. A plate mechanism is provided on one side of the valve body, and two sets of rubber sealing gaskets are embedded in the valve body. The two ends of the rubber sealing gaskets are integrated with magnetic materials in a ring arrangement, and the two sets of rubber sealing gaskets are attracted by opposite directions in the valve body so that the rubber sealing gaskets remain tightly fitted after deformation. Connection holes are opened on the side of the flanges adjacent to the valve body, and slots are opened at the through-hole between the flanges and the valve body. Sealing plates are installed in the slots by bolts, so that the two sets of rubber sealing gaskets are squeezed and fixed.

[0007] The plate mechanism includes a gate plate, which is embedded between two sets of rubber sealing gaskets through one side of the valve body.

[0008] Preferably, the plate mechanism further includes a support block, which is fixedly installed at the passage between the valve body and the gate, and a sealing groove is provided at the top of the support block, and a first plate groove is provided in the sealing groove.

[0009] Preferably, a hollow sealing block is embedded in the sealing groove. The hollow sealing block is used to slide in the first plate groove after the gate plate passes through it. The first plate groove forms a guide structure with the gate plate and the valve body at the point where they pass through.

[0010] Preferably, a first assembly plate is fixedly installed on the top of the support block, and a second assembly plate is installed on the top of the first assembly plate by bolts, so that the hollow sealing block is stably clamped in the sealing groove.

[0011] Preferably, an assembly block is fixedly installed on the top of the second assembly plate, and a second plate groove is opened in the middle of the assembly block. The gate is slidably installed in the second plate groove, and the second plate groove is axially fitted with the first plate groove.

[0012] Preferably, a support frame is bolted to the top of the assembly block near the second plate groove, a threaded rod is threaded to the middle of the top of the support frame, and a pull rod is mounted to the bottom of the threaded rod via a bearing.

[0013] Preferably, a clamping plate is fixedly installed at the bottom end of the pull rod, the clamping plate is installed at the top end of the gate plate by bolts, and a limit block is fixedly installed at the top end of the threaded rod.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This type of knife gate valve with elastic compensation seal achieves dynamic adaptive compensation of the sealing interface through the integrated design of magnetic material and rubber sealing gasket. It can maintain tight fit even when the medium pressure fluctuates or the sealing surface is worn, which significantly improves the sealing reliability under high pressure and high wear conditions.

[0016] 2. This type of knife gate valve with elastic compensation seal, through modular assembly of hollow sealing blocks and detachable assembly plate structure, enables rapid replacement of key sealing components, significantly reducing maintenance costs and downtime caused by aging or damage of seals. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the gate of this utility model;

[0019] Figure 3 This is a schematic diagram of the assembly block of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the sealing plate of this utility model.

[0021] In the diagram: 101, flange; 102, valve body; 103, plate mechanism; 104, rubber sealing gasket; 105, magnetic material; 106, connecting hole; 201, slot; 202, sealing plate; 203, gate; 204, support block; 205, sealing groove; 206, first plate groove; 301, hollow sealing block; 302, first assembly plate; 303, second assembly plate; 304, assembly block; 305, second plate groove; 306, support frame; 401, threaded rod; 402, limit block; 403, tie rod; 404, clamping plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 As shown, this utility model provides a technical solution:

[0024] A knife gate valve with elastic compensation sealing includes two sets of flanges 101, with a valve body 102 installed through the two sets of flanges 101. A plate mechanism 103 is provided on the outer side of the valve body 102. Two sets of rubber sealing gaskets 104 are embedded in the valve body 102. Magnetic materials 105 are integrated at both ends of the rubber sealing gaskets 104 in a ring arrangement. The two sets of rubber sealing gaskets 104 are attracted by opposite directions within the valve body 102, ensuring a tight fit after deformation. Connection holes 106 are respectively opened on the side of the flanges 101 adjacent to the valve body 102. A slot 201 is respectively opened at the through-hole between the flanges 101 and the valve body 102. Sealing plates 202 are respectively installed in the slots 201 by bolts, thereby pressing and fixing the two sets of rubber sealing gaskets 104.

[0025] The plate mechanism 103 includes a gate 203, which passes through one side of the valve body 102 and is embedded between two sets of rubber sealing gaskets 104.

[0026] The above scheme achieves a rigid connection between the valve body and the external pipeline through two sets of flanges, constructs a medium flow channel and integrates sealing components through the valve body, drives the gate to complete vertical lifting and lowering movement through the plate mechanism, forms a bidirectional sealing contact surface through two sets of rubber gaskets, automatically adsorbs and adheres to the gate surface through magnetic material, bolts fix the flange to the external pipeline through the connection hole, applies axial pressure to the rubber gasket through the cooperation of the slot and the sealing plate, and realizes the opening and closing of the sealing interface through the embedding movement of the gate.

[0027] In this embodiment, preferably, the plate mechanism 103 further includes a support block 204, which is fixedly installed at the through-hole between the valve body 102 and the gate 203. A sealing groove 205 is provided at the top of the support block 204, and a first plate groove 206 is provided in the sealing groove 205.

[0028] The above scheme provides a rigid support foundation for the gate movement through the support block, a radial sealing compensation structure is formed by accommodating and positioning the hollow sealing block through the sealing groove, and a guiding path for the gate movement is provided through the first plate groove.

[0029] In this embodiment, preferably, a hollow sealing block 301 is embedded in the sealing groove 205. The hollow sealing block 301 is used to slide in the first plate groove 206 after the gate 203 passes through it. The first plate groove 206 forms a guide structure at the point where the gate 203 and the valve body 102 pass through.

[0030] The above scheme adapts to the wear or displacement of the gate surface by the elastic deformation of the hollow sealing block, and ensures the linear accuracy of the gate's movement trajectory by the dual constraints of the first plate groove and the guide structure.

[0031] In this embodiment, preferably, a first assembly plate 302 is fixedly installed on the top of the support block 204, and a second assembly plate 303 is installed on the top of the first assembly plate 302 by bolts, so that the hollow sealing block 301 is stably clamped in the sealing groove 205.

[0032] The above solution maintains the hollow sealing block in a stable clamping state by bolting the first assembly plate and the second assembly plate, and the detachable design enables rapid maintenance and replacement of the sealing components.

[0033] In this embodiment, preferably, an assembly block 304 is fixedly installed on the top of the second assembly plate 303, and a second plate groove 305 is opened in the middle of the assembly block 304. The gate plate 203 is slidably installed in the second plate groove 305, and the second plate groove 305 is axially fitted with the first plate groove 206.

[0034] The above scheme extends the length of the guide structure by assembling blocks and improves the vertical stability of the gate movement by axially aligning the second slot with the first slot.

[0035] In this embodiment, preferably, a support frame 306 is bolted to the side of the top of the assembly block 304 near the second plate groove 305, a threaded rod 401 is threaded to the middle of the top of the support frame 306, and a pull rod 403 is mounted to the bottom of the threaded rod 401 via a bearing.

[0036] The above scheme provides an installation reference for the threaded rod through the support frame, converts the rotational motion of the threaded rod into the linear lifting motion of the pull rod, and limits the stroke range of the threaded rod through the limit block to avoid overtravel damage.

[0037] In this embodiment, preferably, a clamping plate 404 is fixedly installed at the bottom end of the pull rod 403, the clamping plate 404 is installed at the top end of the gate plate 203 by bolts, and a limit block 402 is fixedly installed at the top end of the threaded rod 401.

[0038] The above scheme achieves precise control of the gate's movement through the threaded transmission of the threaded rod and the pull rod, ensures lossless transmission of driving force through the rigid connection between the clamp and the gate, and eliminates the lateral torque interference of rotational motion on the gate through the bearing structure.

[0039] In this embodiment, a knife gate valve with elastically compensated sealing is used such that when the operator rotates the threaded rod 401, the threaded transmission converts the rotational motion into linear motion through the bearing, driving the pull rod 403 and the clamping plate 404 to rise and fall synchronously. This drives the gate plate 203 to slide precisely along the double guide structure formed by the first groove 206 and the second groove 305. When the gate plate 203 moves downward, its cutting edge is embedded between two sets of rubber sealing gaskets 104. At this time, the rubber sealing gaskets 104 (which can be made of fluororubber matrix + annular neodymium iron boron permanent magnet) pass through... The attraction of opposite magnetic poles generates radial extrusion force, forcing the rubber gasket 104 to undergo elastic deformation and tightly wrap around the surface of the gate 203 (the magnetic attraction dynamically compensates for changes in the sealing gap caused by fluctuations in medium pressure); simultaneously, the sealing plate 202, fixed between the valve body 102 and the flange 101 via the slot 201, applies axial preload to the rubber gasket 104, forming a triple sealing interface composed of magnetic compensation, elastic extrusion, and mechanical compression (the fluororubber gasket combines corrosion resistance and high elasticity); when the gate 203 is fully closed, The magnetic material 105 maintains the continuous fit of the rubber gasket 104, preventing instantaneous leakage due to a sudden drop in medium pressure. When the gate 203 is opened, the anisotropic adsorption between the rubber gaskets 104 eliminates gaps, preventing particles from entering the sealing surface of the rubber gasket 104 and causing sealing failure. During the movement of the gate 203, the hollow sealing block 301 (made of silicone rubber) inside the support block 204 undergoes radial elastic deformation under the pressure of the gate 203, always fitting against the surface of the gate 203 to form a dynamic seal. The first assembly plate 302 and the second assembly plate 303 are fixed to the hollow sealing block 301 by bolts, ensuring sealing stability and allowing for quick replacement of worn parts by removing the bolts. The flange 101 is bolted to the external pipeline through the connection hole 106, and the sealing plate 202 between the valve body 102 and the flange 101 further enhances sealing reliability. In the overall structure, the combination of the magnetic compensation mechanism and the deformation characteristics of the elastic material can maintain a stable seal even under high pressure, corrosive, or particulate media conditions (suitable for harsh environments such as chemical and mining industries).

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A knife gate valve with elastically compensated sealing, comprising two sets of flanges (101), a valve body (102) being installed through the two sets of flanges (101), a plate mechanism (103) being provided on one side of the valve body (102), and two sets of rubber sealing gaskets (104) being embedded in the valve body (102), wherein magnetic materials (105) are integrated at both ends of the rubber sealing gaskets (104) and arranged in a ring, and the two sets of rubber sealing gaskets (104) are... 4) The rubber sealing gasket (104) is tightly fitted after deformation due to the heterogeneous adsorption inside the valve body (102). The flange (101) is provided with connection holes (106) on the side adjacent to the valve body (102). The flange (101) and the valve body (102) are respectively provided with slots (201) at the through-hole. The sealing plates (202) are respectively installed in the slots (201) by bolts, so that the two sets of rubber sealing gaskets (104) are squeezed and fixed. The plate mechanism (103) includes a gate (203), which is embedded between two sets of rubber sealing gaskets (104) through one side of the valve body (102).

2. The knife gate valve with elastically compensated sealing according to claim 1, characterized in that: The plate mechanism (103) also includes a support block (204), which is fixedly installed at the passage between the valve body (102) and the gate (203). A sealing groove (205) is provided at the top of the support block (204), and a first plate groove (206) is provided in the sealing groove (205).

3. The knife gate valve with elastically compensated sealing according to claim 2, characterized in that: A hollow sealing block (301) is embedded in the sealing groove (205). The hollow sealing block (301) is used to slide and install with the first plate groove (206) after the gate (203) passes through it. The first plate groove (206) forms a guide structure at the point where the gate (203) and the valve body (102) pass through.

4. A knife gate valve with elastically compensated sealing according to claim 3, characterized in that: The support block (204) has a first assembly plate (302) fixedly installed at its top end. The first assembly plate (302) has a second assembly plate (303) installed at its top end by bolts, so that the hollow sealing block (301) is stably clamped in the sealing groove (205).

5. A knife gate valve with elastically compensated sealing according to claim 4, characterized in that: An assembly block (304) is fixedly installed on the top of the second assembly plate (303). A second plate groove (305) is opened in the middle of the assembly block (304). The gate plate (203) is slidably installed in the second plate groove (305). The second plate groove (305) is axially fitted with the first plate groove (206).

6. A knife gate valve with elastically compensated sealing according to claim 5, characterized in that: The top of the assembly block (304) is fitted with a support frame (306) by bolts on the side near the second plate groove (305). A threaded rod (401) is threadedly installed in the middle of the top of the support frame (306). A pull rod (403) is installed at the bottom of the threaded rod (401) by bearing.

7. A knife gate valve with elastically compensated sealing according to claim 6, characterized in that: A clamping plate (404) is fixedly installed at the bottom end of the pull rod (403), and the clamping plate (404) is installed on the top end of the gate plate (203) by bolts. A limit block (402) is fixedly installed at the top end of the threaded rod (401).

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