A knife gate valve that is easy to open and close

Abstract

The utility model relates to the technical field of valves, and provides a knife gate valve that is easy to open and close, comprising a valve body and a valve seat, wherein the valve seat cooperates with a gate to conduct or cut off a fluid, and further comprises a bracket and a linkage rod, wherein one end of the linkage rod is connected to an operating mechanism, and the other end is connected to the gate, and the operating mechanism controls the linkage rod to move relative to the bracket to drive the gate to conduct or cut off the fluid, and the inner wall of the valve body is connected and cooperated with a support ring at the side of the gate, and the valve seat is positioned between the valve body and the support ring so that the valve seat and the side of the gate are sealed and cooperated; in this scheme, the valve seat is positioned by the valve body and the support ring, and is arranged at the side of the gate to seal and cooperate with the gate, so that the valve seat has a scraping effect on the material on the surface of the gate when the gate is lifted vertically, so as to avoid the gate being stuck when opening and closing due to material deposition, and the first inclined surface at the lower end of the gate has an angle of 5-20° with the second inclined surface, so that the two inclined surfaces are not completely fitted, so as to avoid the gate being stuck with the positioning groove after particle sedimentation, and improve the smoothness of operation.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a knife gate valve which is easy to open and close. Background Art

[0002] Knife-type gate valve is mainly used as a regulating and intercepting device, and is applied to pipelines such as tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electricity, shipbuilding, metallurgy, and energy systems. It is based on ordinary gate valves, but the flat valve plate is replaced by a knife-shaped valve plate; the knife-type gate valve solves the problems of large flow resistance, heavy weight, difficult installation, and large footprint of ordinary gate valves, flat gate valves, ball valves, stop valves, regulating valves, butterfly valves, etc. with its advantages of small size, small flow resistance, light weight, easy installation, and easy disassembly.

[0003] The knife-type gate valves currently on the market usually have a groove on the valve seat. The gate is embedded in the groove and squeezes the elastic seal downward to cooperate with the seal to achieve sealing and interception. However, in the transportation of some slurries or solid particles, a small amount of material will adhere to the surface of the gate and continuously enter the groove or stuffing box as the gate valve is opened and closed, or get stuck in the gate and the side wall of the groove. When the gate is closed for a long time, the sedimentation of the material will increase the friction between the gate and the groove, resulting in a decrease in the smoothness of the operation and the sealing of the gate during long-term use. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and provide a knife gate valve that is easy to open and close. The technical solution adopted by the utility model is as follows:

[0005] A knife gate valve that is easy to open and close, comprising a valve body and a valve seat, the valve seat cooperates with a gate to conduct or cut off fluid, and also comprises a bracket and a linkage rod, one end of the linkage rod is connected to an operating mechanism, and the other end is connected to the gate, the operating mechanism controls the displacement of the linkage rod relative to the bracket to drive the gate to conduct or cut off fluid, the inner wall of the valve body is connected to a support ring on the side of the gate, the valve seat is positioned between the valve body and the support ring so that the valve seat and the gate side are sealed and matched; a guide groove is provided at one end of the valve body close to the bracket, and a positioning groove for limiting the stroke of the gate is provided at the end away from the bracket, the valve seat is located on one side of the positioning groove, and the contact surface between the gate and the positioning groove is an inclined surface; the guide groove makes the gate sufficiently stable and accurately positioned when vertically lifted and lowered, and the positioning groove makes the gate seal and cooperate with the valve seat when closed and stably positioned in the horizontal direction.

[0006] The lower end of the gate plate has a first inclined surface, and the side of the positioning groove facing the valve seat is a second inclined surface. When the gate plate and the valve seat are sealed, the lower end of the gate plate abuts against the second inclined surface and there is an angle of 5-20° between the first inclined surface and the second inclined surface, so that the two inclined surfaces are not completely in contact, thereby avoiding the gate plate and the positioning groove from getting stuck after particles settle.

[0007] The valve seat comprises a soft sealing elastic member, and the soft sealing elastic member is positioned and matched with the valve body and / or the support ring in a stepped manner.

[0008] The valve body and the support ring cooperate to form an L-shaped groove, and the soft sealing elastic member is embedded in the L-shaped groove so that the soft sealing elastic member is at least partially exposed outside the L-shaped groove to cooperate with the side sealing of the gate plate.

[0009] The cross-section of the soft sealing elastic part is L-shaped, including a transverse sealing structure that contacts with the gate plate to form a sealing fit, and a vertical sealing structure clamped between the valve body and the support ring; the transverse sealing structure is vertically limited between the valve body and the support ring, and the vertical sealing structure is laterally limited between the valve body and the support ring.

[0010] An O-ring is arranged on one side of the vertical sealing structure away from the transverse sealing structure, and the O-ring is in contact and fit with the valve body and the support ring.

[0011] The beneficial effects of the utility model are as follows: the technical scheme positions the valve seat through the valve body and the support ring, and is arranged on the side of the gate plate and cooperates with the gate plate seal, so that the valve seat has a scraping effect on the material on the surface of the gate plate when the gate plate is vertically lifted or lowered, and there is no need to set a groove on the valve seat so that the gate plate is embedded in the groove when it is vertically lifted or lowered, thereby avoiding the gate plate from getting stuck when opening and closing due to material deposition. When the first inclined surface at the lower end of the gate plate is against the second inclined surface, there is an angle of 5-20°, so that the two inclined surfaces are not completely fitted, thereby avoiding the gate plate and the positioning groove from getting stuck after particles settle, thereby improving the smoothness of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0013] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0014] Figure 2 is a cross-sectional view of Example 1;

[0015] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0016] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0017] In the figure, 1-valve body, 11-guide groove, 12-positioning groove, 2-gate, 3-support ring, 4-valve seat, 41-soft sealing elastic part, 5-O-ring, 6-packing, 61-annular sealing ring, 62-U-shaped sealing ring, 621-positioning protrusion, 63-elastic support part, 64-positioning bracket, 7-packing gland, 8-pointer, 9-linkage rod, 10-bracket, 11-bolt, 12-cylinder, 13-stud bolt, 14-nut, 15-protective cover. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0019] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0020] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0021] Example 1

[0022] like Figure 1-3 As shown, a knife gate valve that is easy to open and close includes a valve body 1 and a valve seat 4. The valve seat 4 cooperates with the gate 2 to conduct or cut off the fluid. It also includes a bracket 10 and a linkage rod 9. One end of the linkage rod 9 is connected to an operating mechanism, and the other end is connected to the gate 2. The operating mechanism controls the displacement of the linkage rod 9 relative to the bracket 10 to drive the gate 2 to conduct or cut off the fluid. The inner wall of the valve body 1 is connected to the side of the gate 2 by bolts with a support ring 3. The valve seat 4 is positioned between the valve body 1 and the support ring 3 so that the valve seat 4 and the side of the gate 2 are sealed.

[0023] The valve seat 4 comprises a soft sealing elastic member 41 , and the soft sealing elastic member 41 is positioned and matched with the valve body 1 and / or the support ring 3 in a stepped manner.

[0024] The valve body 1 and the support ring 3 cooperate to form an L-shaped groove, and the soft sealing elastic member 41 is embedded in the L-shaped groove so that the soft sealing elastic member 41 is at least partially exposed outside the L-shaped groove to cooperate with the side of the gate plate 2 in a sealing manner.

[0025] The cross-section of the soft sealing elastic member 41 is L-shaped, including a transverse sealing structure that contacts the gate plate 2 to form a sealing fit, and a vertical sealing structure clamped between the valve body 1 and the support ring 3; the transverse sealing structure is vertically limited between the valve body 1 and the support ring 3, and the vertical sealing structure is laterally limited between the valve body 1 and the support ring 3.

[0026] An O-ring 5 is disposed on a side of the vertical sealing structure away from the transverse sealing structure, and the O-ring 5 is in contact with the valve body 1 and the support ring 3 .

[0027] A guide groove 11 is arranged at one end of the valve body 1 close to the bracket 10, and a positioning groove 12 for limiting the stroke of the gate plate 2 is arranged at the end away from the bracket 10. The valve seat 4 is located on one side of the positioning groove 12, and the contact surface between the gate plate 2 and the positioning groove 12 is an inclined surface; the guide groove makes the gate plate 2 sufficiently stable and accurately positioned during vertical lifting and lowering, and the positioning groove makes the gate plate seal with the valve seat 4 when closed and stably positioned in the horizontal direction.

[0028] The lower end of the gate plate 2 has a first inclined surface, and the side of the positioning groove 12 facing the valve seat 4 is a second inclined surface. When the gate plate 2 and the valve seat 4 are sealed, the lower end of the gate plate 2 abuts against the second inclined surface and there is an angle of 15° between the first inclined surface and the second inclined surface, so that the two inclined surfaces are not completely in contact, thereby avoiding the gate plate and the positioning groove from getting stuck after particles settle.

[0029] Finally, the bracket 10 and the linkage rod 9 connected to the bracket 10 and longitudinally displaceable relative to the bracket 10, one end of the linkage rod 9 is connected to the operating mechanism, a pneumatic actuator is used in this embodiment, and the other end is connected to the gate 2, the operating mechanism controls the linkage rod 9 to move relative to the bracket 10 to conduct or cut off the fluid; the linkage rod 9 is linked to the laterally arranged pointer 8, at least one end of the pointer 8 passes through the bracket 10, and a travel groove for sliding one end of the pointer 8 is set on the side of the bracket 10 corresponding to the pointer 8 passing through, and a scale mark is set on the side of the travel groove.

[0030] One end of the pointer 8 is fixedly connected to the linkage rod 9, and the other end is inserted into the travel groove of the bracket 10. Only one end of the pointer passes through the travel of the bracket 10. The side with the travel groove and the scale mark is the observation surface of the bracket 10.

[0031] One end of the pointer 8 is threadedly connected to the linkage rod 9. When the gate 2 cooperates with the valve seat 4 to cut off the fluid, the pointer 8 is located at the lower end of the stroke groove, but not the end point of the stroke groove. The length of the stroke groove is slightly greater than the stroke length of the gate 2.

[0032] Example 2

[0033] Reference Figure 4Embodiment 2 is further configured on the basis of embodiment 1, wherein the inner wall of the valve body 1 has a stuffing box 6 that cooperates with the valve stem seal and a stuffing gland 7 that cooperates with the stuffing box, and an annular sealing ring 61 and a sealing compensation component are arranged in the stuffing box 6; the sealing compensation component includes a positioning bracket 64, on which a U-shaped sealing ring 62 is arranged, and the positioning bracket 64 is embedded in the U-shaped opening of the U-shaped sealing ring 62, and an elastic support member 63 that expands to both sides (to open the opening of the U-shaped sealing ring 62 to both sides) is arranged between the positioning bracket 64 and the U-shaped sealing ring 62.

[0034] In addition, the U-shaped sealing ring 62 has a flexible protrusion on one side close to the valve stem, and a positioning protrusion 621 protrudes inward (close to the side of the positioning bracket 64) at the U-shaped opening of the U-shaped sealing ring 62, and a groove matching the positioning protrusion 621 is provided on the positioning bracket 64.

[0035] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A knife gate valve that is easy to open and close, comprising a valve body (1) and a valve seat (4), wherein the valve seat (4) cooperates with a gate plate (2) to conduct or cut off a fluid, and further comprising a bracket (10) and a linkage rod (9), wherein one end of the linkage rod (9) is connected to an operating mechanism and the other end is connected to the gate plate (2), wherein the operating mechanism controls the linkage rod (9) to move relative to the bracket (10) to drive the gate plate (2) to conduct or cut off the fluid, and wherein: The inner wall of the valve body (1) is connected to the side of the gate plate (2) and is matched with a support ring (3); the valve seat (4) is positioned between the valve body (1) and the support ring (3) so that the valve seat (4) and the side of the gate plate (2) are sealed and matched; A guide groove (11) is provided at one end of the valve body (1) close to the bracket (10), and a positioning groove (12) for limiting the stroke of the gate plate (2) is provided at the end away from the bracket (10); the valve seat (4) is located on one side of the positioning groove (12), and the contact surface between the gate plate (2) and the positioning groove (12) is an inclined surface; The lower end of the gate plate (2) has a first inclined surface, and the inner wall of the positioning groove (12) facing the valve seat (4) is a second inclined surface. When the gate plate (2) and the valve seat (4) are sealed, the lower end of the gate plate (2) abuts against the second inclined surface and an angle of 5-20° exists between the first inclined surface and the second inclined surface.

2. The knife gate valve that is easy to open and close according to claim 1, characterized in that: The valve seat (4) comprises a soft sealing elastic member (41), and the soft sealing elastic member (41) is positioned and matched with the valve body (1) and / or the support ring (3) in a stepped manner.

3. The knife gate valve that is easy to open and close according to claim 2 is characterized in that: The valve body (1) and the support ring (3) cooperate to form an L-shaped groove, and the soft sealing elastic member (41) is embedded in the L-shaped groove so that the soft sealing elastic member (41) is at least partially exposed outside the L-shaped groove to cooperate with the side sealing of the gate plate (2).

4. The knife gate valve that is easy to open and close according to claim 2 is characterized in that: The cross section of the soft sealing elastic member (41) is L-shaped, and comprises a transverse sealing structure that contacts with the gate plate (2) to form a sealing fit, and a vertical sealing structure sandwiched between the valve body (1) and the support ring (3).

5. The knife gate valve that is easy to open and close according to claim 4, characterized in that: An O-ring (5) is provided on a side of the vertical sealing structure away from the transverse sealing structure, and the O-ring (5) is in contact with and fits the valve body (1) and the support ring (3).

6. The knife gate valve that is easy to open and close according to claim 1, characterized in that: The inner wall of the valve body (1) is provided with a stuffing box (6) which is in sealing cooperation with the valve stem, and a stuffing gland (7) which is in cooperation with the stuffing box, and an annular sealing ring (61) and a sealing compensation component are provided in the stuffing box (6); The sealing compensation component comprises a positioning bracket (64), a U-shaped sealing ring (62) is arranged on the positioning bracket (64), the positioning bracket (64) is embedded in the U-shaped opening of the U-shaped sealing ring (62), and an elastic support member (63) expanding toward both sides is arranged between the positioning bracket (64) and the U-shaped sealing ring (62).

7. The knife gate valve that is easy to open and close according to claim 6, characterized in that: The U-shaped sealing ring (62) has a flexible protrusion on one side close to the valve stem.

8. The knife gate valve that is easy to open and close according to claim 6, characterized in that: A positioning protrusion (621) protrudes inwardly from the U-shaped opening of the U-shaped sealing ring (62), and a groove matching the positioning protrusion (621) is provided on the positioning bracket (64).

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