Linear flow regulation knife gate valve

Abstract

The utility model relates to a linear flow regulation knife gate valve which comprises a valve body seat, a gate plate, a protection plate, a valve rod seat and a valve rod, the bottom of the valve rod is connected with the gate plate, the valve body seat comprises a front valve seat and a rear valve seat, a front gate plate groove is formed in the rear side of the front valve seat, a rear gate plate groove is formed in the front side of the rear valve seat, and the front gate plate groove and the rear gate plate groove are spliced to form a gate plate sliding groove. A gate hole plate is arranged in the rear gate plate groove and provided with a gate hole, the gate hole is a rhombic hole, two included angles of the gate hole are distributed in the vertical direction, the other two included angles of the gate hole are distributed in the left-right horizontal direction, and the diagonal length of the upper included angle and the lower included angle of the gate hole is larger than that of the left included angle and the right included angle. The front side of the gate hole plate is attached to the rear side of the flashboard. Linear adjustment of flow is achieved through cooperation of the rhombic gate holes in the gate hole plate and the gate plate, fluid speed changes stably, and meanwhile the opening degree of the gate plate can be easily mastered according to the lifting height of the valve rod.

Description

Technical Field

[0001] The utility model relates to a knife gate valve, in particular to a linear flow regulating knife gate valve. Background Art

[0002] Knife gate valves are widely used in chemical, papermaking, and sewage treatment pipelines to control the flow of media. Opening and closing knife gates significantly impact the flow velocity within the pipeline. Sudden changes in flow velocity can easily impact the stability of various systems within the pipeline. Traditional knife gate valves cannot achieve linear regulation when opening and closing, resulting in sudden changes in flow velocity and harmful effects on the pipeline. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a linear flow regulating knife gate valve.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a linear flow regulating knife gate valve, comprising a valve body seat, a gate sliding up and down on the valve body seat, a protective plate arranged on the top of the gate plate, a valve stem seat arranged on the top of the protective plate, a valve stem matched with the valve stem seat, the bottom of the valve stem is connected to the gate plate, the valve body seat comprises a front valve seat and a rear valve seat, the rear side of the front valve seat is fitted with the front side of the rear valve seat, the front valve seat and the rear valve seat are detachably connected mechanically by bolts, the rear side of the front valve seat is provided with a front gate plate groove, the front side of the rear valve seat is provided with a rear gate plate groove, the front gate plate groove and the rear gate plate groove are assembled into a gate plate slide groove, the front valve The seat is provided with a front valve hole, which passes through the front gate plate groove; the rear valve seat is provided with a rear valve hole, which passes through the rear gate plate groove; the front valve hole and the rear valve hole are coaxial and connected to form a main valve hole; a gate hole plate is provided in the rear gate plate groove; the gate hole plate is provided with a gate hole; the gate hole is a diamond hole; the two angles of the gate hole are distributed vertically up and down and extend to the upper and lower edges of the main valve hole; the other two angles of the gate hole are distributed horizontally left and right and extend to the left and right edges of the main valve hole; the diagonal length of the upper and lower angles of the gate hole is greater than the diagonal length of the left and right angles; the front side of the gate hole plate is in contact with the rear side of the gate plate.

[0005] As a further improvement of this design, the cross-sectional area of ​​the gate hole is 55% of the cross-sectional area of ​​the main valve hole.

[0006] As a further improvement of the present design, the gate plate is a stainless steel plate with a polished surface.

[0007] As a further improvement of the present design, the gate orifice plate is connected to the rear valve seat by means of positioning ears or welding.

[0008] As a further improvement of this design, sealing strips are provided on both sides and the bottom edge of the gate slide, and a horizontal sealing strip is connected between the top ends of the sealing strip. The horizontal sealing strip is provided with a gate gap to facilitate the passage of the gate.

[0009] As a further improvement of the present design, reinforcement rings are provided at the front and rear edges of the main valve hole.

[0010] The beneficial effects of the utility model are as follows: the utility model realizes linear adjustment of flow rate through the cooperation of the diamond-shaped gate hole on the gate plate and the gate plate, the fluid speed changes smoothly, and the gate plate opening can be easily controlled according to the valve stem lifting height. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.

[0013] Figure 2 It is an overall cross-sectional schematic diagram of the present utility model.

[0014] Figure 3 It is a three-dimensional schematic diagram of the valve body seat of the present utility model.

[0015] Figure 4 It is a cross-sectional schematic diagram of the valve body seat of the present utility model.

[0016] Figure 5 It is a schematic diagram of the three-dimensional structure of the gate orifice plate of the present utility model.

[0017] Figure 6 It is a schematic diagram of the opening degree-valve flow rate curve of the utility model.

[0018] Figure 7 It is a schematic diagram of opening degree-flow percentage of the utility model.

[0019] In the figure, 1. valve stem, 2. valve stem seat, 3. protective plate, 4. rear valve seat, 5. gate hole plate, 6. main valve hole, 7. gate hole, 8. gate, 9. front valve seat, 10. front valve hole, 11. rear valve hole, 12. horizontal sealing strip, 13. gate gap, 14. reinforcement ring, 15. sealing strip, 16. gate slide groove, 17. front gate groove, 18. rear gate groove, 19. positioning ear. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions are only used to explain the present invention but are not intended to limit the present invention. Example

[0021] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , This embodiment provides a linear flow regulating knife gate valve, comprising a valve body seat, a gate plate 8 sliding up and down on the valve body seat, a protective plate 3 arranged on the top of the gate plate 8, a valve stem seat 2 arranged on the top of the protective plate 3, and a valve stem 1 cooperating with the valve stem seat 2, the bottom of the valve stem 1 is connected to the gate plate 8, the valve body seat comprises a front valve seat 9 and a rear valve seat 4, the rear side of the front valve seat 9 is in contact with the front side of the rear valve seat 4, the front valve seat 9 and the rear valve seat 4 are detachably connected mechanically by bolts, a front gate plate groove 17 is provided on the rear side of the front valve seat 9, a rear gate plate groove 18 is provided on the front side of the rear valve seat 4, the front gate plate groove 17 and the rear gate plate groove 18 are assembled into a gate plate slide groove 16, and the front valve seat 9 is provided with a front valve hole 10 The front valve hole 10 passes through the front gate groove 17, and the rear valve seat 4 is provided with a rear valve hole 11, and the rear valve hole 11 passes through the rear gate groove 18. The front valve hole 10 is coaxial with the rear valve hole 11 and is connected to form the main valve hole 6. A gate hole plate 5 is provided in the rear gate groove 18, and the gate hole plate 5 is provided with a gate hole 7. The gate hole 7 is a diamond hole, and the two angles of the gate hole 7 are distributed vertically up and down and extend to the upper and lower edges of the main valve hole 6. The other two angles of the gate hole 7 are distributed horizontally left and right and extend to the left and right edges of the main valve hole 6. The diagonal length of the upper and lower angles of the gate hole 7 is greater than the diagonal length of the left and right angles. The front side of the gate hole plate 5 is in contact with the rear side of the gate plate 8.

[0022] The above-mentioned linear adjustment of flow rate is achieved by cooperation between the diamond-shaped gate hole 7 on the gate hole plate 5 and the gate plate 8, and the fluid speed changes smoothly. At the same time, the opening of the gate plate 8 can be easily controlled according to the lifting height of the valve stem 1.

[0023] See Figure 5 In order to ensure that the knife gate valve has a larger flow adjustment range, the cross-sectional area of ​​the gate hole 7 is 55% of the cross-sectional area of ​​the main valve hole 6.

[0024] See Figure 5 In order to increase the service life of the gate plate 5 and improve the sealing between the gate plate 5 and the gate plate 8, the gate plate 5 is a stainless steel plate with a polished surface.

[0025] See Figure 5 The gate orifice plate 5 is connected to the rear valve seat 4 by a positioning ear 19 or welding.

[0026] See Figure 2 In order to ensure the sealing of the gate 8, sealing strips 15 are provided on both sides and the bottom edge of the gate slide 16. A horizontal sealing strip 12 is connected between the top ends of the sealing strip 15. The horizontal sealing strip 12 is provided with a gate gap 13 for the gate 8 to pass through.

[0027] See Figure 1 In order to improve the overall strength of the knife gate valve, reinforcement rings 14 are provided at the front and rear edges of the main valve hole 6.

[0028] During operation, the valve stem 1 is driven to rise, and the valve stem 1 lifts the gate plate 8. The bottom of the gate plate 8 and the gate hole 7 form a circle to facilitate the passage of fluid through the knife gate valve. In order to improve the adjustment linearity of the knife gate valve, the bottom edge of the gate plate 8 is approximately a straight line.

[0029] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A linear flow regulating knife gate valve, comprising a valve body seat, a gate sliding up and down on the valve body seat, a protective plate arranged on the top of the gate plate, a valve stem seat arranged on the top of the protective plate, and a valve stem cooperating with the valve stem seat, wherein the bottom of the valve stem is connected to the gate plate, characterized in that: The valve body seat includes a front valve seat and a rear valve seat, the rear side of the front valve seat is fitted with the front side of the rear valve seat, the front valve seat and the rear valve seat are detachably connected by bolts, the rear side of the front valve seat is provided with a front gate groove, the front side of the rear valve seat is provided with a rear gate groove, the front gate groove and the rear gate groove are combined into a gate slide groove, the front valve seat is provided with a front valve hole, the front valve hole passes through the front gate groove, the rear valve seat is provided with a rear valve hole, the rear valve hole passes through the rear gate groove, the front valve hole Coaxial with the rear valve hole and connected to form the main valve hole, a gate hole plate is provided in the rear gate plate groove, and the gate hole is provided on the gate hole plate. The gate hole is a diamond hole, and the two angles of the gate hole are distributed in the upper and lower vertical directions and extend to the upper and lower edges of the main valve hole. The other two angles of the gate hole are distributed in the left and right horizontal directions and extend to the left and right edges of the main valve hole. The diagonal lengths of the upper and lower angles of the gate hole are greater than the diagonal lengths of the left and right angles, and the front side of the gate hole plate is in contact with the rear side of the gate plate.

2. A linear flow regulating knife gate valve according to claim 1, characterized in that: The cross-sectional area of ​​the gate hole is 55% of the cross-sectional area of ​​the main valve hole.

3. A linear flow regulating knife gate valve according to claim 1, characterized in that: The gate hole plate is a stainless steel plate with a polished surface.

4. A linear flow regulating knife gate valve according to claim 1, characterized in that: The gate orifice plate is connected to the rear valve seat by means of positioning ears or welding.

5. A linear flow regulating knife gate valve according to claim 1, characterized in that: Sealing strips are provided on both sides and the bottom edge of the gate slideway, and a transverse sealing strip is connected between the two ends of the top of the sealing strip. The transverse sealing strip is provided with a gate slot for the gate to pass through.

6. A linear flow regulating knife gate valve according to claim 1, characterized in that: Reinforcement rings are provided on the front and rear edges of the main valve hole.

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