Gate valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a gate valve which comprises a valve body, a valve cover is arranged on the top of the valve body, and a valve rod support is arranged on the valve cover. The valve seat is arranged in the valve body, and a first sealing piece is arranged on the valve seat; the valve rod is arranged on the valve body, the valve rod and the valve rod support in a penetrating mode, and a hand wheel is arranged at the top end of the valve rod; the flashboard is arranged in the valve body and matched with the valve seat, and the top end of the flashboard is connected with the bottom end of the valve rod; the supplementary sealing part comprises a second sealing piece arranged on the valve seat; the scale part is arranged in the valve rod bracket; wherein the second sealing piece can be matched with the gate plate to form a supplementary sealing surface when the gate plate is closed, the scale part can mark the moving stroke of the valve rod, and compared with the prior art, the use stability of the gate valve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a gate valve. Background Art

[0002] The gate valve is a gate plate of an opening and closing component. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed by the contact between the valve seat and the gate plate. Usually, the sealing surface is welded with metal materials to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The gate plate includes a rigid gate plate and an elastic gate plate. For example, a gate valve disclosed in the patent with application number CN202120007664.6 includes: a valve stem, a first valve seat, a second valve seat, a valve body, a valve core and a valve cover for sealing the valve body; the valve core, the first valve seat and the second valve seat are all located in the valve body, and the lower end of the valve stem passes through the valve cover and is connected to the upper end of the valve core;

[0003] During use, this existing gate valve has a single sealing method and the sealing surface is prone to breakthrough, which reduces the stability of the gate valve. In addition, the gate valve is difficult to determine its stroke, which leads to the phenomenon of not being closed or fully opened during the switching process. Therefore, it is necessary to make improvements. Utility Model Content

[0004] The purpose of the utility model is to provide a gate valve in order to improve the stability of the gate valve in use in view of the above-mentioned technical problems.

[0005] In view of this, the present invention provides a gate valve, comprising:

[0006] A valve body, a valve cover is provided on the top of the valve body, and a valve stem bracket is provided on the valve cover;

[0007] a valve seat, the valve seat being arranged in the valve body and having a first sealing member provided on the valve seat;

[0008] A valve stem, the valve stem being passed through the valve body, the valve stem and the valve stem bracket, and a hand wheel being provided at the top end of the valve stem;

[0009] A gate plate is disposed in the valve body and cooperates with the valve seat, and the top end of the gate plate is connected to the bottom end of the valve stem;

[0010] Also includes:

[0011] a supplementary sealing portion, the supplementary sealing portion comprising a second sealing member disposed on the valve seat;

[0012] A scale portion, the scale portion being disposed in the center of the valve stem bracket;

[0013] The second sealing member can cooperate with the gate plate to form a supplementary sealing surface when the gate plate is closed, and the scale portion can mark the movement stroke of the valve stem.

[0014] In the present technical solution, during the use of the gate valve, the valve stem is driven by the handwheel to operate so as to control the lifting or lowering of the gate. In the process of the gate plate descending to close the gate valve, the gate plate descends to the stroke limit and cooperates with the first sealing member on the valve seat to form a first sealing surface. At the same time, the second sealing member on the supplementary sealing portion can synchronously cooperate with the gate plate to form a supplementary sealing surface. The formation of two sealing surfaces can effectively reduce the phenomenon of the medium breaking through the sealing surface, thereby improving the stability of the gate valve. At the same time, during the operation of the valve stem, the scale portion can effectively mark the movement stroke of the valve stem, which is convenient for the user to observe the lifting and lowering of the gate valve, ensuring that the gate valve can be fully opened or closed, and further improving the stability of the gate valve.

[0015] In the above technical solution, further, the supplementary sealing portion further includes:

[0016] A follower ring, which is arranged in the valve stem bracket and sleeved on the valve stem, and the follower ring and the valve stem are movably matched in the circumferential direction of the valve stem and fixedly matched in the axial direction;

[0017] A piston column, the piston column is arranged on the valve cover, a movable piston is arranged in the piston column, and an air hole is arranged at the bottom of the piston column;

[0018] A lifting rod, the lifting rod is passed through the piston column, and the bottom end of the lifting rod is connected to the movable piston;

[0019] A connecting rod, one end of which is connected to the top of the lifting rod, and the other end of which is connected to the follower ring;

[0020] The air hole is connected to the second sealing member through an air pipe, and the second sealing member can be expanded by conveying compressed air through the air pipe and cooperate with the gate plate to form a supplementary sealing surface.

[0021] In the above technical solution, further, the scale portion further includes:

[0022] A benchmark rod, one end of which is connected to the follower ring;

[0023] A main scale, the main scale being arranged on the pole;

[0024] A slide groove, the slide groove being arranged on the inner wall of the valve stem bracket;

[0025] The end of the rod away from the follower ring is slidably arranged in the slide groove, and a marking line that matches the main scale is provided on the inner arm of the valve stem bracket.

[0026] In the above technical solution, further, the second sealing member further includes:

[0027] a mounting groove, the mounting groove being provided on the valve seat and being located radially inward of the first sealing member;

[0028] an airbag body, the airbag body being disposed in the mounting groove;

[0029] Wherein, the airbag body is connected to the air hole through an air tube.

[0030] In the above technical solution, further comprising:

[0031] a corrosion-resistant layer, the corrosion-resistant layer being disposed on the surface of the airbag body;

[0032] A wear-resistant layer, the wear-resistant layer being arranged on the surface of the corrosion-resistant surface;

[0033] A reinforcing rib layer, the reinforcing rib layer being arranged on the inner side of the airbag body;

[0034] The fiber layer is arranged on the inner side of the reinforcing rib layer.

[0035] The beneficial effects of the utility model are:

[0036] 1. The setting of the supplementary sealing part can effectively reduce the phenomenon of the medium breaking through the sealing surface and improve the stability of the gate valve.

[0037] 2. The provision of the corrosion-resistant layer, the wear-resistant layer, the reinforcing rib layer and the fiber layer can effectively improve the various performances of the airbag body, thereby increasing the service life of the second seal and further improving the stability of the gate valve.

[0038] 3. The setting of the scale part can effectively mark the movement stroke of the valve stem, which is convenient for users to observe the lifting and lowering of the gate valve, ensuring that the gate valve can be fully opened or closed, and further improving the stability of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 It is a schematic structural diagram of a specific implementation method of the present utility model.

[0041] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of the present invention.

[0042] Figure 3This is a schematic diagram of the main structure of the airbag of the utility model.

[0043] Figure 4 This is a schematic diagram of the piston column structure of the utility model.

[0044] Figure 5 This is a schematic diagram of the cross-sectional structure of the airbag main body of the present utility model.

[0045] The marks in the figure are:

[0046] 1. Valve body; 2. Valve cover; 3. Valve stem bracket; 4. Valve seat; 5. First sealing part; 6. Valve stem; 7. Handwheel; 8. Gate; 9. Supplementary sealing part; 90. Second sealing part; 900. Mounting groove; 901. Airbag body; 91. Follower ring; 92. Piston column; 93. Moving piston; 94. Air hole; 95. Lifting rod; 96. Connecting rod; 97. Air pipe; 10. Scale part; 100. Scale; 101. Main scale; 102. Slide; 11. Corrosion-resistant layer; 12. Wear-resistant layer; 13. Reinforcement rib layer; 14. Fiber layer. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] In the description of this application, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0049] Example 1:

[0050] The present application provides a gate valve, comprising: a valve body 1, a valve cover 2 being provided on the top of the valve body 1, a valve stem 6 support 3 being provided on the valve cover 2; a valve seat 4 being provided in the valve body 1, a first sealing member 5 being provided on the valve seat 4; a valve stem 6 being provided through the valve body 1, the valve stem 6 and the valve stem 6 support 3, a hand wheel 7 being provided on the top of the valve stem 6; a gate plate 8 being provided in the valve body 1 and cooperating with the valve seat 4, the top of the gate plate 8 being connected to the bottom of the valve stem 6;

[0051] The valve stem 6 is provided with a support 3 and a scale portion 10. The valve stem 6 is provided with a support 3 and a scale portion 10.

[0052] The second sealing member 90 can cooperate with the gate plate 8 to form a supplementary sealing surface when the gate plate 8 is closed, and the scale portion 10 can mark the movement stroke of the valve stem 6.

[0053] Moreover, the first sealing member 5 is a conventional structure, such as a sealing surface formed by surfacing metal material.

[0054] In this embodiment, during the use of the gate valve, the valve stem 6 is driven by the handwheel 7 to operate so as to control the gate plate 8 to lift or lower. In the process of the gate plate 8 descending to close the gate valve, the gate plate 8 descends to the stroke limit and cooperates with the first sealing member 5 on the valve seat 4 to form a first sealing surface. At the same time, the second sealing member 90 on the supplementary sealing portion 9 can synchronously cooperate with the gate plate 8 to form a supplementary sealing surface. The formation of the two sealing surfaces can effectively reduce the phenomenon of the medium breaking through the sealing surface, thereby improving the stability of the gate valve. At the same time, during the operation of the valve stem 6, the scale portion 10 can effectively mark the movement stroke of the valve stem 6, which is convenient for the user to observe the lifting and lowering of the gate valve, ensuring that the gate valve can be fully opened or closed, and further improving the stability of the gate valve.

[0055] Example 2:

[0056] This embodiment provides a gate valve. In addition to the technical solutions of the above embodiments, it also has the following technical features: the supplementary sealing portion 9 further includes: a follower ring 91, which is arranged in the valve stem 6 bracket 3 and sleeved on the valve stem 6. The follower ring 91 and the valve stem 6 are movably matched in the circumferential direction of the valve stem 6 and fixedly matched in the axial direction; a piston column 92, which is arranged on the valve cover 2, and a movable piston 93 is provided in the piston column 92. The bottom of the piston column 92 is provided with an air hole 94; a lifting rod 95, which is passed through the piston column 92 and the bottom end of the lifting rod 95 is connected to the movable piston 93; a connecting rod 96, one end of the connecting rod 96 is connected to the top of the lifting rod 95, and the other end is connected to the follower ring 91;

[0057] The air hole 94 is connected to the second sealing member 90 through the air pipe 97 , and the second sealing member 90 can be expanded by conveying compressed air through the air pipe 97 and cooperate with the gate plate 8 to form a supplementary sealing surface.

[0058] The second sealing member 90 further includes: a mounting groove 900, which is provided on the valve seat 4 and radially inward of the first sealing member 5; and an airbag body 901, which is provided in the mounting groove 900.

[0059] The airbag body 901 is connected to the air hole 94 through the air tube 97 .

[0060] Moreover, the mounting groove 900 and the airbag body 901 are both in a shape similar to the valve seat 4, such as a ring shape, so as to facilitate cooperation with the gate valve. The mounting groove 900 and the airbag body 901 can be symmetrically arranged on both sides of the valve seat 4 with the gate plate 8 as the symmetrical plane.

[0061] In this embodiment, during the opening and closing process of the gate valve, the valve stem 6 operates and rises and falls, thereby driving the gate plate 8 to rise and fall, and the follower ring 91 rises and falls as the valve stem 6 rises and falls. Driven by the connecting rod 96, the lifting rod 95 drives the moving piston 93 to rise and fall as the follower ring 91 rises and falls. When the gate plate 8 descends to close the gate valve, the moving piston 93 descends and squeezes the compressed air into the air pipe 97 through the air hole 94, and sends the compressed air into the airbag body 901 through the air pipe 97 to expand the airbag body 901. After the gate plate 8 descends to the stroke limit, the airbag body 901 expands to its maximum volume and presses tightly against the surface of the gate plate 8, thereby forming a second sealing surface. Due to the characteristics of the airbag body 901, the airbag body 901 can also play a role in vibration buffering, which can effectively buffer the impact of the medium on the gate plate 8 and reduce the impact of impact vibration on the gate plate 8. At the same time, the symmetrical distribution of the two airbag bodies 901 can also effectively position and limit the gate plate 8, reducing the phenomenon of the gate plate 8 being offset. In the process of lifting the gate valve to open the gate valve, the moving piston 93 moves upward synchronously to extract the air in the airbag body 901, and the airbag body 901 releases the squeezing of the gate plate 8, thereby facilitating the lifting of the gate plate 8. Compared with the prior art, the utility model can effectively reduce the phenomenon of the medium breaking through the sealing surface and improve the stability of the gate valve.

[0062] Example 3:

[0063] This embodiment provides a gate valve. In addition to the technical solutions of the above embodiments, it also has the following technical features: the scale portion 10 further includes: a rod 100, one end of which is connected to the follower ring 91; a main scale 101, which is provided on the rod 100; and a slide groove 102, which is provided on the inner wall of the valve stem 6 bracket 3.

[0064] Among them, the end of the benchmark 100 away from the follower ring 91 is slidably set in the sliding groove 102, and a marking line that matches the main scale 101 is set on the inner arm of the valve stem 6 bracket 3.

[0065] In this embodiment, the follower ring 91 can synchronously drive the marker 100 to move during its movement, thereby moving the scale to correspond to the movement stroke of the valve stem 6, and finally to the movement stroke of the gate plate 8. The setting of the scale portion 10 can effectively mark the movement stroke of the valve stem 6, making it convenient for the user to observe the lifting and lowering of the gate valve, ensuring that the gate valve can be fully opened or closed, and further improving the stability of the gate valve.

[0066] Example 4:

[0067] This embodiment provides a gate valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including: a corrosion-resistant layer 11, the corrosion-resistant layer 11 is arranged on the surface of the airbag body 901; a wear-resistant layer 12, the wear-resistant layer 12 is arranged on the surface of the corrosion-resistant layer; a reinforcing rib layer 13, the reinforcing rib layer 13 is arranged on the inner side of the airbag body 901; and a fiber layer 14, the fiber layer 14 is arranged on the inner side of the reinforcing rib layer.

[0068] Moreover, the wear-resistant layer 12 and the corrosion-resistant layer 11 are both made of corresponding conventional materials, and the fiber layer 14 is carbon fiber.

[0069] In this embodiment, the provision of the corrosion-resistant layer 11, the wear-resistant layer 12, the reinforcing rib layer 13 and the fiber layer 14 can effectively improve the various performances of the airbag body 901, reduce the corrosion damage, wear and rupture of the airbag body 901, thereby increasing the service life of the second seal 90 and further improving the stability of the gate valve.

[0070] The embodiments of the present application are described above in conjunction with the accompanying drawings. Unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A gate valve comprising: A valve body (1), a valve cover (2) is provided on the top of the valve body (1), and a valve stem (6) bracket (3) is provided on the valve cover (2); A valve seat (4), the valve seat (4) being arranged in the valve body (1), and a first sealing member (5) being arranged on the valve seat (4); A valve stem (6), the valve stem (6) is passed through the valve body (1), the valve stem (6) and the valve stem (6) bracket (3), and a hand wheel (7) is provided at the top end of the valve stem (6); a gate plate (8), the gate plate (8) being arranged in the valve body (1) and cooperating with the valve seat (4), the top end of the gate plate (8) being connected to the bottom end of the valve stem (6); It is characterized by further comprising: A supplementary sealing portion (9), the supplementary sealing portion (9) comprising a second sealing member (90) disposed on the valve seat (4); A scale portion (10), the scale portion (10) being arranged in the center of the valve stem (6) bracket (3); The second sealing member (90) can cooperate with the gate plate (8) to form a supplementary sealing surface when the gate plate (8) is closed, and the scale portion (10) can mark the movement stroke of the valve stem (6).

2. A gate valve according to claim 1, characterized in that: The supplementary sealing portion (9) further comprises: A follower ring (91), the follower ring (91) is arranged in a valve stem (6) bracket (3) and sleeved on the valve stem (6), the follower ring (91) and the valve stem (6) are movably matched in the circumferential direction of the valve stem (6) and fixedly matched in the axial direction; A piston column (92), the piston column (92) is arranged on the valve cover (2), a movable piston (93) is arranged in the piston column (92), and an air hole (94) is arranged at the bottom of the piston column (92); A lifting rod (95), the lifting rod (95) is passed through the piston column (92), and the bottom end of the lifting rod (95) is connected to the movable piston (93); A connecting rod (96), one end of which is connected to the top of the lifting rod (95), and the other end of which is connected to the follower ring (91); The air hole (94) is connected to the second sealing member (90) through an air pipe (97), and the second sealing member (90) can be expanded by conveying compressed air through the air pipe (97) and cooperate with the gate plate (8) to form a supplementary sealing surface.

3. A gate valve according to claim 2, characterized in that: The scale part (10) further includes: A rod (100), one end of which is connected to the follower ring (91); A main scale (101), wherein the main scale (101) is arranged on the pole (100); A slide groove (102), wherein the slide groove (102) is provided on the inner wall of the valve stem (6) bracket (3); The end of the rod (100) away from the follower ring (91) is slidably arranged in the slide groove (102), and a marking line matching the main scale (101) is provided on the inner arm of the valve stem (6) bracket (3).

4. A gate valve according to claim 2, characterized in that: The second sealing member (90) further comprises: a mounting groove (900), the mounting groove (900) being provided on the valve seat (4) and being located radially inward of the first sealing member (5); An airbag body (901), the airbag body (901) being disposed in the mounting groove (900); The airbag body (901) is connected to the air hole (94) via an air tube (97).

5. A gate valve according to claim 4, characterized in that: Also includes: a corrosion-resistant layer (11), the corrosion-resistant layer (11) being provided on the surface of the airbag body (901); A wear-resistant layer (12), the wear-resistant layer (12) being provided on the surface of the corrosion-resistant surface; A reinforcing rib layer (13), wherein the reinforcing rib layer (13) is arranged on the inner side of the airbag body (901); A fiber layer (14) is provided on the inner side of the reinforcing rib layer.

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