Gate valve

Abstract

The utility model relates to the technical field of gate valves, in particular to a gate valve which comprises a shell provided with a valve port; a driving mechanism; the sealing plate is arranged in the shell, and the sealing plate blocks or opens the valve port under the action of the driving mechanism; the transmission mechanism is used for connecting the sealing plate with the driving mechanism, the transmission mechanism comprises a connecting rod assembly and a transmission plate, the connecting rod assembly is connected with the driving mechanism, and the transmission plate is connected with the sealing plate; the transmission plate is provided with at least two elastic pieces, the sealing plate is provided with at least two limiting blocks, and the elastic pieces and the limiting blocks are matched to enable the distance between the transmission plate and the sealing plate to be kept within a specified range.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of plug valve, in particular to a plug valve. BACKGROUND

[0002] Among various types of valves, the gate valve is the most widely used one, and the plug valve is one of the gate valves. The plug valve is a main control device for flow or conveying capacity of powder, granular material, particulate material and small block material, and is widely used in metallurgy, mining, building materials, food, chemical industry and other industries to control flow change or rapidly cut off. The working principle of the plug valve is that a valve is opened on the gate plate, and the opening and closing of the valve are controlled by opening and closing the gate plate. The plug valve has the advantages that the valve body has no groove, the medium will not be blocked, the valve seat and the gate plate are always in close motion during the closing and opening process, the valve opening and closing force is stable, and the plug valve has the characteristics of cutting off the medium.

[0003] The plug valve is usually composed of a shell, a sealing plate and a driving mechanism. Under the action of the driving mechanism, the sealing plate approaches or moves away from the shell to realize the closing or opening of the valve. A sealing ring is arranged on the sealing plate. After the sealing plate approaches the shell, the sealing ring located between the sealing plate and the shell is extruded, and the valve is closed. In the prior art, the sealing ring on the sealing plate of the plug valve is easily subjected to a large friction force during valve closing, and the sealing ring will be worn down over a long period of time, which will affect the sealing performance of the valve. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies or problems in the prior art, the present disclosure provides a plug valve which is reliable in operation and has good sealing performance.

[0005] The technical scheme adopted by the present disclosure to solve the above technical problems is as follows: a plug valve comprising:

[0006] a shell, the shell being provided with a valve port;

[0007] a driving mechanism;

[0008] a sealing plate, the sealing plate being arranged in the shell, and the sealing plate being used to block or open the valve port under the action of the driving mechanism;

[0009] a transmission mechanism, the transmission mechanism being used to connect the sealing plate and the driving mechanism, the transmission mechanism comprising a connecting rod assembly and a transmission plate, the connecting rod assembly being connected with the driving mechanism, and the transmission plate being connected with the sealing plate;

[0010] at least two elastic members are arranged on the transmission plate, and at least two limiting blocks are arranged on the sealing plate, the elastic members and the limiting blocks being used in cooperation to keep the distance between the transmission plate and the sealing plate within a specified range.

[0011] In a preferred embodiment, the transmission plate is provided with at least two strip grooves, and a limiting rod is provided in the strip groove. The limiting rod is arranged along the length direction of the strip groove, the elastic element is sleeved on the outside of the limiting rod, and the limiting block passes through the strip groove and is located on one side of the elastic element.

[0012] In a preferred embodiment, the transmission plate is provided with a through hole and a plurality of first steel balls, the plurality of first steel balls being arranged around the through hole, and the sealing plate having a plurality of groove groups on the side facing the transmission plate, the number and position of the groove groups corresponding to the first steel balls.

[0013] In a preferred embodiment, the groove group includes a first groove and a second groove that are interconnected, wherein the size of the first groove is larger than the size of the second groove.

[0014] In a preferred embodiment, the transmission plate is provided with four second steel balls, and there are four strip grooves and limiting blocks, with the second steel balls disposed on the outer side of the strip groove.

[0015] In a preferred embodiment, the limiting block includes an integrally formed first block and a second block, the first block being connected to a sealing plate, and the lower surface of the second block being provided with a first inclined surface.

[0016] In a preferred embodiment, the lower surface of the second block is further provided with a second inclined surface, and the thickness of the second block on the first inclined surface is greater than its thickness on the second inclined surface.

[0017] In a preferred embodiment, an arc-shaped surface is provided at the transition point between the first inclined plane and the second inclined plane.

[0018] In a preferred embodiment, the end of the sealing plate away from the transmission mechanism is provided with at least one protrusion; the side of the sealing plate facing the housing is provided with an annular groove, and a sealing ring is provided in the annular groove.

[0019] In a preferred embodiment, the housing further includes two second plates, which are respectively connected to the first plate and are arranged in parallel on both sides of the first plate. At least one positioning component is provided on each side of the transmission plate, and the positioning component is in contact with the second plate.

[0020] In a preferred embodiment, the elastic element is a spring; the limiting block is connected to the sealing plate by bolts.

[0021] In a preferred embodiment, the driving mechanism is a cylinder, and the cylinder is provided with a piston rod, which is connected to a connecting rod assembly.

[0022] In a preferred embodiment, the movement ratio of the piston rod to the sealing plate is 1:3 to 1:10.

[0023] In a preferred embodiment, the movement ratio of the piston rod to the sealing plate is 1:4.15.

[0024] Compared with existing products, this application uses the cooperation of elastic elements and limiting blocks to keep the distance between the transmission plate and the sealing plate within a specified range. In this way, before the sealing plate is in position (meaning the end face of the sealing plate has reached the inner wall of the housing and the sealing plate can no longer move relative to the housing), there is always a certain gap between the sealing plate and the housing. This avoids the sealing ring from being subjected to large frictional forces and causing wear during the movement of the sealing plate, and also avoids the sealing ring on the sealing plate from being worn when the valve is closed. Attached Figure Description

[0025] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0026] Figure 1 This is one of the structural schematic diagrams of a slide gate valve disclosed herein;

[0027] Figure 2 This is the second schematic diagram of the structure of a slide gate valve disclosed herein;

[0028] Figure 3 This is a public announcement Figure 2 A magnified view of a section at point A in the middle;

[0029] Figure 4 This is a cross-sectional view of a slide gate valve disclosed herein;

[0030] Figure 5 This is a public announcement Figure 4 A magnified view of a section at point B in the middle;

[0031] Figure 6 This is one of the structural schematic diagrams of the sealing plate disclosed herein;

[0032] Figure 7 This is the second schematic diagram of the structure of the sealing plate disclosed herein;

[0033] Figure 8 This is a schematic diagram of the connection between the transmission plate and the sealing plate disclosed in this paper;

[0034] Figure 9 This is a schematic diagram of the structure of the transmission plate disclosed in this paper;

[0035] Figure 10 This is one of the structural schematic diagrams of the limit block disclosed herein;

[0036] Figure 11 This is the second schematic diagram of the structure of the limiting block disclosed herein;

[0037] Figure 12 This is a cross-sectional view of the transmission plate and sealing plate of the gate valve of this disclosure when the valve port is closed;

[0038] Figure 13 This is a public announcement Figure 12 A magnified view of a section at point C;

[0039] Figure 14 This is a public announcement Figure 12 A magnified view of a section at point D;

[0040] Figure 15 This is a schematic diagram of the connection between the transmission plate and the sealing plate when the valve port of the slide gate valve disclosed herein is closed;

[0041] Figure 16 This is a public announcement Figure 15 A magnified view of a section at point E in the middle;

[0042] Figure 17 This is a schematic diagram of the connection between the transmission plate and the sealing plate when the valve port of the gate valve disclosed herein is opened.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Housing; 2. Transmission plate; 3. Sealing plate; 4. Linkage assembly; 5. Drive mechanism; 6. Strip groove; 7. Limiting block; 8. Protrusion; 9. First groove; 10. Second groove; 11. Elastic element; 12. Limiting rod; 13. First steel ball; 14. Second steel ball; 16. Sealing ring; 17. Piston rod; 18. First plate; 19. Through hole; 20. First block; 21. Second block; 22. First inclined surface; 23. Second inclined surface; 24. Arc-shaped surface; 25. Valve port; 26. Second plate; 27. Positioning assembly. Detailed Implementation

[0045] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0046] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0047] Please refer to Figures 1-5 and Figure 9 As shown, this application provides a slide gate valve, including a housing 1 with a valve port 25; a drive mechanism 5; a sealing plate 3 disposed within the housing 1, which blocks or opens the valve port 25 under the action of the drive mechanism 5; and a transmission mechanism for connecting the sealing plate 3 to the drive mechanism 5. The transmission mechanism includes a connecting rod assembly 4 and a transmission plate 2, the connecting rod assembly 4 being connected to the drive mechanism 5, and the transmission plate 2 being slidably connected to the sealing plate 3. At least two elastic elements 11 are provided on the transmission plate 2, and at least two limiting blocks 7 are provided on the sealing plate 3. The elastic elements 11 and the limiting blocks 7 cooperate to maintain the distance between the transmission plate 2 and the sealing plate 3 within a specified range. An annular groove is provided on the side of the sealing plate 3 facing the housing 1, and a sealing ring 16 is provided in the annular groove. After the sealing plate 3 contacts the housing 1, the sealing ring 16 is compressed to seal the valve port 25. It should be noted that the specified range refers to a relatively close distance between the sealing plate 3 and the transmission plate 2, ensuring that there is always a gap between the sealing plate 3 and the housing 1 before it reaches its final position. This application utilizes the cooperation of the elastic element 11 and the limiting block 7 to maintain the distance between the transmission plate 2 and the sealing plate 3 within a specified range. This ensures that before the sealing plate 3 reaches its final position (meaning the end face of the sealing plate 3 has reached the inner wall of the housing 1 and the sealing plate 3 can no longer move relative to the housing 1), a certain gap always exists between the sealing plate 3 and the housing 1. This prevents the sealing ring 16 from experiencing excessive friction and wear during the movement of the sealing plate 3, thus preventing wear on the sealing ring 16 when the valve is closed. Furthermore, this application uses a connecting rod assembly 4 for transmission. The connecting rod assembly 4 has a simple structure, low processing cost, and stable and reliable operation during transmission. The connecting rod assembly 4 used in the transmission mechanism of the slide gate valve is prior art, and this application will not elaborate on the specific structure of the connecting rod assembly 4.

[0048] Specifically, the elastic element 11 is a spring, the transmission plate 2 and the sealing plate 3 are roughly square plates, the transmission plate 2 is provided with four strip grooves 6, and each strip groove 6 is located near the four top corners of the transmission plate 2. The sealing plate 3 is provided with four limiting blocks 7, which are connected to the sealing plate 3 by bolts, and the limiting blocks 7 pass through the strip grooves 6.

[0049] like Figure 9 As shown, in one embodiment of this disclosure, limiting rods 12 and elastic members 11 are provided in the two strip grooves 6 away from the transmission mechanism. The limiting rods 12 are arranged along the length direction of the strip grooves 6, and the elastic members 11 are sleeved on the outside of the limiting rods 12. No limiting rods 12 and elastic members 11 are provided in the two strip grooves 6 near the transmission mechanism. The limiting block 7 includes two first limiting blocks 7 and two second limiting blocks 7. The two first limiting blocks 7 are respectively provided in the two strip grooves 6 away from the transmission mechanism, and the two second limiting blocks 7 are respectively provided in the two strip grooves 6 near the transmission mechanism. The first limiting blocks 7 are provided with slots for the limiting rods 12 to pass through. Since no limiting rods 12 are provided in the two strip grooves 6 near the transmission mechanism, no slots are required in the second limiting blocks 7.

[0050] In another embodiment of this disclosure, each of the four strip grooves 6 is provided with a limiting rod 12 and an elastic element 11. The elastic element 11 is sleeved on the outside of the limiting rod 12, and the limiting block 7 is located on one side of the elastic element 11. It can be understood that the limiting block 7 in this embodiment is provided with a slot for the limiting rod 12 to pass through.

[0051] Please refer to Figures 6-8 As shown, the sealing plate 3 has two protrusions 8 at the end away from the transmission mechanism, and the housing 1 has a first plate 18 at the end away from the transmission mechanism. The transmission plate 2 has a through hole 19 and eight first steel balls 13, which are arranged around the through hole 19. The sealing plate 3 has eight groove groups on the side facing the transmission plate 2, and the positions of the groove groups correspond to the first steel balls 13. Specifically, the groove group includes a first groove 9 and a second groove 10 that are interconnected. The size of the first groove 9 is larger than the size of the second groove 10. The groove group is teardrop-shaped. Here, the size refers to the depth and size of the groove. The groove depth of the first groove 9 is greater than the groove depth of the second groove 10, and the outline of the first groove 9 is larger than the outline of the second groove 10.

[0052] When the drive mechanism 5 pushes the transmission plate 2 forward (towards the first plate 18), the sealing plate 3 moves together with the transmission plate 2. As the sealing plate 3 and the transmission plate 2 get closer and closer to the first plate 18, the two protrusions 8 on the sealing plate 3 first contact the first plate 18. After the protrusions 8 contact the first plate 18, the sealing plate 3 can no longer move forward. During this process, the first steel ball 13 is located in the first groove 9. After the two protrusions 8 on the sealing plate 3 just contact the first plate 18, there is still a gap between the transmission plate 2 and the first plate 18. Under the push of the drive mechanism 5, the transmission plate 2 continues to move towards the first plate 18, and the first steel ball 13 gradually enters the second groove 10 from the first groove 9. Under the action of the first steel ball 13, the sealing plate 3 is pushed away from the transmission plate 2. The distance between the sealing plate 3 and the transmission plate 2 gradually increases, and the distance between the sealing plate 3 and the housing 1 decreases. When the first steel ball 13 completely enters the second groove 10 (as shown in the image), the sealing plate 3 is pushed away from the transmission plate 2. Figures 12-16 As shown, the sealing plate 3 contacts the housing 1 to close the valve port 25, and the sealing ring 16 is squeezed by the sealing plate 3 and the housing 1 to seal the valve port 25, at which time fluid cannot pass through the valve port 25. In the prior art, the sealing plate 3 often contacts the housing 1 before the protrusion reaches the first plate 18, and the sealing plate 3 continues to move forward with the transmission plate 2. During the movement, the sealing ring 16 located between the sealing plate 3 and the housing 1 will be worn. In this application, through the cooperation of the elastic element 11 and the limiting block 7, the first steel ball 13 is always located in the first groove 9 before the protrusion reaches the first plate 18, so that there is a gap between the sealing plate 3 and the housing 1, avoiding wear of the sealing ring 16 when the sealing plate 3 moves. It should be noted that after the protrusion hits the first plate 18, as the transmission plate 2 continues to advance towards the first plate 18, the elastic element 11 moves towards the limiting block 7, and the elastic element 11 is gradually squeezed by the limiting block 7 and the inner wall of the strip groove 6. When the distance between the sealing plate 3 and the transmission plate 2 is at its maximum, the compression degree of the elastic element 11 is at its maximum.

[0053] Please refer to Figures 8-11 As shown, specifically, four second steel balls 14 are provided on the transmission plate 2, each second steel ball 14 is respectively located at the four top corners of the transmission plate 2, and the second steel balls 14 are located on the outside of the strip groove 6. The limiting block 7 includes an integrally formed first block 20 and a second block 21. The first block 20 is connected to the sealing plate 3. The lower surface of the second block 21 is provided with a first inclined surface 22 and a second inclined surface 23. The thickness of the second block 21 on the first inclined surface 22 is greater than its thickness on the second inclined surface 23, that is, the first inclined surface 22 is closer to the surface of the sealing plate 3. The first inclined surface 22 is located away from the first plate 18, and the second steel balls 14 are located below the second block 21.

[0054] Please refer to the following: Figure 17As shown, when valve port 25 opens, on the one hand, the elastic element 11 resets and pushes the transmission plate 2 away from the first plate 18; on the other hand, the drive mechanism 5 pulls the transmission plate 2 away from the first plate 18. The first steel ball 13 enters the first groove 9 from the second groove 10. At the same time, the second steel ball 14 moves from directly below the second inclined surface 23 to directly below the first inclined surface 22. Since the second block 21 is thicker than the first inclined surface 22, the second steel ball 14 hits the lower edge of the first inclined surface 22, dragging the sealing plate 3 towards the transmission plate 2, causing the sealing plate 3 to leave the valve port 25. During the process of valve port 25 opening from closed, the sealing plate 3 cannot quickly leave the valve port 25 under the pressure of the fluid. The arrangement of the first inclined surface 22 and the second inclined surface 23 on the second block 21 enables the sealing plate 3 to quickly leave the valve port 25, allowing the valve port 25 to open quickly. After the sealing plate 3 separates from the housing 1, the sealing plate 3 and the transmission plate 2 move synchronously away from the first plate 18 under the action of the drive mechanism 5. In order to enable the second steel ball 14 to move more smoothly from the second inclined surface 23 to the first inclined surface 22, an arc-shaped surface 24 is provided at the transition point from the first inclined surface 22 to the second inclined surface 23.

[0055] Please continue reading. Figure 2 and Figure 3 As shown, the housing 1 also includes two second plates 26, which are respectively connected to the first plate 18 and arranged parallel to both sides of the first plate 18. To ensure that the sealing plate 3 and the transmission plate 2 remain centered within the housing 1, two positioning components 27 are respectively provided on both sides of the transmission plate 2. The sides of the positioning components 27 contact the second plates 26, limiting the transmission plate 2 and the sealing plate 3 to the middle position of the housing 1. This prevents the transmission plate 2 or the sealing plate 3 from contacting the housing 1 during movement, thus avoiding friction between the sides of the transmission plate 2 or the sealing plate 3 and the second plates 26. This arrangement facilitates the installation of the slide gate valve and reduces the influence of the installation direction on the valve. Specifically, the positioning component 27 includes a ball assembly and a bearing. The bearing is sleeved on the outside of the ball assembly and contacts the second plate 26. The specific structure of the ball assembly is prior art and will not be described further here.

[0056] The drive mechanism 5 in this application is a cylinder, which is equipped with a piston rod 17, which is connected to the connecting rod assembly 4. The movement ratio between the cylinder piston rod 17 and the sealing plate 3 of the slide valve in this application is 1:4.15, which has the characteristics of rapid opening and rapid closing.

[0057] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A slide gate valve, characterized in that, include: The housing (1) has a valve port (25); Drive mechanism (5); A sealing plate (3) is disposed inside the housing (1). The sealing plate (3) blocks or opens the valve port (25) under the action of the driving mechanism (5). A transmission mechanism is used to connect the sealing plate (3) to the drive mechanism (5). The transmission mechanism includes a connecting rod assembly (4) and a transmission plate (2). The connecting rod assembly (4) is connected to the drive mechanism (5), and the transmission plate (2) is connected to the sealing plate (3). The transmission plate (2) is provided with at least two elastic elements (11), and the sealing plate (3) is provided with at least two limiting blocks (7). The elastic elements (11) and the limiting blocks (7) cooperate to keep the distance between the transmission plate (2) and the sealing plate (3) within a specified range.

2. The slide gate valve according to claim 1, characterized in that, The transmission plate (2) is provided with at least two strip grooves (6), and a limiting rod (12) is provided in the strip groove (6). The limiting rod (12) is arranged along the length direction of the strip groove (6). The elastic element (11) is sleeved on the outside of the limiting rod (12). The limiting block (7) passes through the strip groove (6) and is located on one side of the elastic element (11).

3. The slide gate valve according to claim 1, characterized in that, The transmission plate (2) is provided with a through hole (19) and a plurality of first steel balls (13). The plurality of first steel balls (13) are arranged around the through hole (19). The sealing plate (3) is provided with a plurality of groove groups on the side facing the transmission plate (2). The number and position of the groove groups correspond to the first steel balls (13).

4. The slide gate valve according to claim 3, characterized in that, The groove group includes a first groove (9) and a second groove (10) that are interconnected, and the size of the first groove (9) is larger than the size of the second groove (10).

5. The slide gate valve according to claim 2, characterized in that, The transmission plate (2) is provided with four second steel balls (14), and the strip groove (6) and the limiting block (7) are four in total. The second steel balls (14) are located on the outside of the strip groove (6).

6. The slide gate valve according to claim 5, characterized in that, The limiting block (7) includes an integrally formed first block (20) and a second block (21). The first block (20) is connected to the sealing plate (3), and the lower surface of the second block (21) is provided with a first inclined surface (22).

7. The slide gate valve according to claim 6, characterized in that, The lower surface of the second block (21) is also provided with a second inclined surface (23), and the thickness of the second block (21) on the first inclined surface (22) is greater than its thickness on the second inclined surface (23).

8. The slide gate valve according to claim 7, characterized in that, An arc-shaped surface (24) is provided at the transition point from the first inclined surface (22) to the second inclined surface (23).

9. The slide gate valve according to claim 1, characterized in that, The sealing plate (3) has at least one protrusion (8) at the end away from the transmission mechanism; the sealing plate (3) has an annular groove on the side facing the housing (1), and a sealing ring (16) is provided in the annular groove.

10. The slide gate valve according to claim 1, characterized in that, The driving mechanism (5) is a cylinder, and the cylinder is provided with a piston rod (17), which is connected to the connecting rod assembly (4); the movement ratio of the piston rod (17) to the sealing plate (3) is 1:3-1:10.

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