A knife-type gate valve structure

Abstract

The utility model relates to the technical field, specifically to a knife-type gate valve structure. The utility model provides a knife-type gate valve structure, including: a double-plate valve seat; and a valve plate arranged at the center of the double-plate valve seat; wherein flanges are fixed on both sides of the double-plate valve seat; and a through hole is formed between the flange and the double-plate valve seat; and a flow isolation component is arranged on the valve plate; wherein the flow isolation component is against the inner wall of the double-plate valve seat; the utility model arranges the flow isolation component on the valve plate, and the sealing degree can be checked by lifting the valve plate, thereby reducing the difficulty of operating the gate valve structure for inspection; by arranging a first extension part and a second extension part, the sealing effect is enhanced by the function of close fitting; by arranging a metal cover ring, the probability of the sealing ring being worn is reduced, thereby reducing the possibility of leakage.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a knife-type gate valve structure. Background Art

[0002] The existing knife gate valve structure is relatively common, such as a knife gate valve with patent number 201820796584.1. For details, please refer to Figure 1 ,like Figure 1 As shown, the knife gate valve includes a valve body 1, a valve plate 1-1 is arranged inside the valve body 1, and the valve body 1 is positioned on a base 3. Lifting mechanisms are symmetrically arranged on both sides of the valve body 1, and the lifting mechanisms are also positioned on the base 3. In this embodiment, the lifting mechanism is a cylinder, and the execution end of the lifting mechanism is connected to the valve plate 1-1 in the valve body 1. The overall connection method is that the valve plate 1-1 is connected to the plug-in plate connecting frame 4 by means of screws, and the execution end of the lifting mechanism, that is, the piston end of the cylinder, is connected to the plug-in plate connecting frame 4. When the piston of the cylinder is controlled to move up and down, it drives the plug-in plate connecting frame 4 to move, so that the valve plate 1-1 moves up and down to form an on-off control. An adjustment bracket 5 is also provided at the lower end of the lifting mechanism. In the above and related technologies, the sealing ring is installed on the valve body 1 to achieve the mutual sealing between the through hole and the valve plate 1-1. The sealing ring is prone to wear and leakage during the continuous opening and closing of the valve plate 1-1.

[0003] Therefore, how to prevent the sealing ring from being worn is a technical problem that needs to be solved urgently in this field. Utility Model Content

[0004] The utility model provides a knife-type gate valve structure to solve the above technical problems.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a knife-type gate valve structure, including: a double-plate valve seat; and a valve plate arranged at the center position of the double-plate valve seat; wherein flanges are fixed on both sides of the double-plate valve seat; and a through hole is formed between the flange and the double-plate valve seat; and a flow isolation component is arranged on the valve plate; wherein the flow isolation component is against the inner wall of the double-plate valve seat.

[0006] Furthermore, a limiting ring groove is provided on the valve plate; wherein a part of the flow isolation component is embedded in the limiting ring groove.

[0007] Furthermore, the flow isolation component includes a sealing ring; wherein a portion of the sealing ring is embedded in the limiting ring groove.

[0008] Furthermore, the vertical cross-section of the sealing ring is in a transverse "T" shape.

[0009] Furthermore, the sealing ring includes a supporting portion; wherein the supporting portion is arranged in the limiting ring groove.

[0010] Furthermore, a first extension portion and a second extension portion are provided on one side of the support portion; wherein the sum of the widths of the first extension portion and the second extension portion is greater than the width of the support portion; and the first extension portion and the second extension portion are provided outside the limiting ring groove.

[0011] Furthermore, the first extension portion has a built-in surface.

[0012] Furthermore, the second extension portion has an externally exposed surface.

[0013] Furthermore, a metal cover ring is provided at the edge of the first extension portion; wherein a portion of the inner wall of the metal cover ring overlaps with the inner surface.

[0014] Furthermore, a chamfer is provided on an edge of one end of the metal cover ring facing the limiting ring groove.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] By setting a flow isolation component on the valve plate, the sealing degree can be checked by lifting the valve plate, reducing the difficulty of repairing the gate valve structure;

[0017] By providing the first extension part and the second extension part, the sealing effect is enhanced by the function of close fitting;

[0018] By providing a metal cover ring, the probability of the sealing ring being worn is reduced, thereby reducing the possibility of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a structural schematic diagram of a knife gate valve in the prior art;

[0021] Figure 2 A three-dimensional diagram of a preferred embodiment of a knife-type gate valve structure of the utility model;

[0022] Figure 3 A three-dimensional diagram of some optimal embodiments of the valve plate of the utility model;

[0023] Figure 4 For this utility model Figure 3 The enlarged structural diagram at A in the middle;

[0024] Figure 5 It is a schematic diagram of the vertical cross-section outer contour of the flow isolation component of the utility model.

[0025] Among them, 100, double-plate valve seat; 200, flange; 300, through hole; 400, valve plate; 500, flow isolation component; 501, sealing ring; 5011, supporting part; 5012, first extension part; 5013, second extension part; 5014, built-in surface; 5015, external leakage surface; 502, metal cover ring. DETAILED DESCRIPTION

[0026] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0027] See also Figure 2 Combined with Figure 3 , Figure 2 A three-dimensional diagram of a preferred embodiment of a knife-type gate valve structure of the utility model; Figure 3 The following is a three-dimensional diagram of some of the best embodiments of the valve plate of the utility model. Figures 2 to 3 As shown, at least one embodiment provides a knife-type gate valve structure, including: a double-plate valve seat 100; and a valve plate 400 arranged at the center of the double-plate valve seat 100; there is a gap between the two plates of the double-plate valve seat 100, which is used to allow the valve plate 400 to rise and fall, and the valve plate 400 is connected to the lifting structure, and the effect of closing the through hole 300 is achieved by lifting, and a limited position ring groove 401 is provided on the valve plate 400; wherein flanges 200 are fixed on both sides of the double-plate valve seat 100; the flanges 200 are used to be fixedly connected to the external mounting platform, so that the gate valve structure as a whole and the external mounting platform are relatively fixed , and a through hole 300 is formed between the flange 200 and the double-plate valve seat 100; in order to seal the gap between the valve plate 400 and the two plates, a flow isolation component 500 is arranged on the valve plate 400; the flow isolation component 500 moves up and down with the up and down movement of the valve plate 400. When the valve plate 400 is in a closed state, part of the flow isolation component 500 extends to the outside of the double-plate valve seat 100. When the valve plate 400 is in a fully open state, the flow isolation component 500 is against the inner wall of the double-plate valve seat 100, and there is no leaking part at this time, wherein part of the flow isolation component 500 is embedded in the limiting ring groove 401.

[0028] Please continue reading Figure 3 Also see Figures 4 to 5 , Figure 4 For this utility model Figure 3 The enlarged structural diagram at A in the middle; Figure 5 FIG. 1 is a schematic diagram of the vertical cross-section outer contour of the flow isolation component of the utility model. Figures 3 to 5 As shown, the flow isolation assembly 500 includes a sealing ring 501, wherein a portion of the sealing ring 501 is embedded in the limiting ring groove 401. The vertical section of the sealing ring 501 is in a transverse "T" shape.

[0029] Please continue reading Figure 4 Combined with Figure 5 .like Figures 4 to 5 As shown, the sealing ring 501 includes a supporting portion 5011; wherein the supporting portion 5011 is arranged in the limiting ring groove 401. It is necessary to supplement that the width of the limiting ring groove 401 is consistent with the sum of the widths of the first extension portion 5012 and the second extension portion 5013, so that when the valve plate 400 is in a fully open state, the sealing ring 501 is squeezed and can be accommodated in the limiting ring groove 401. A first extension portion 5012 and a second extension portion 5013 are arranged on one side of the supporting portion 5011; wherein the sum of the widths of the first extension portion 5012 and the second extension portion 5013 is greater than the width of the supporting portion 5011; and the first extension portion 5012 and the second extension portion 5013 are arranged outside the limiting ring groove 401. The first extension portion 5012 has an inner surface 5014. The second extension portion 5013 has an outer leakage surface 5015. When the valve plate 400 is in a fully closed state, the inner surface 5014 is in an extruded state, and the outer leakage surface 5015 is expanded, and the width of the outer leakage surface 5015 increases. The protruding part of the collision allows the second extension part 5013 to extend to the outside of the limiting ring groove 401. At this time, the connection position between the inner surface 5014 and the outer leakage surface 5015 is against the edge of the through hole 300, and the protruding outer leakage surface 5015 will cover the edge of the through hole 300 and squeeze the surface of the valve plate 400, and the function of close fitting can enhance the sealing effect.

[0030] Please continue reading Figure 4 Combined with Figure 5 .like Figures 4 to 5 As shown, in order to reduce the degree of friction of the sealing ring 501 during the lifting and lowering of the valve plate 400, a metal cover ring 502 is arranged at the edge of the first extension 5012; wherein part of the inner wall of the metal cover ring 502 overlaps with the inner surface 5014, which enables the first extension 5012 and the second extension 5013 to be squeezed into the limiting ring groove 401 during the lifting and lowering of the valve plate 400, and the metal cover ring 502 and the inner wall of the double-plate valve seat 100 are against each other, and at this time, the external leakage surface 5015 will be against the inner wall of the double-plate valve seat 100. Due to the thickness difference caused by the metal cover ring 502, the mutual squeezing force between the external leakage surface 5015 and the inner wall of the double-plate valve seat 100 is small, which can greatly reduce the wear caused by direct friction. The edge of the metal cover ring 502 facing the limiting ring groove 401 is chamfered, and the chamfer is to allow the metal cover ring 502 to push the first extension 5012 and the second extension 5013 smoothly into the limiting ring groove 401.

[0031] In summary, by arranging the flow isolation assembly 500 on the valve plate 400, the sealing degree can be checked by lifting the valve plate 400, thereby reducing the difficulty of operating the gate valve structure for maintenance; by arranging the first extension portion 5012 and the second extension portion 5013, when the inner surface 5014 is squeezed, the connection position between the inner surface 5014 and the outer leakage surface 5015 abuts against the edge of the through hole 300, thereby enhancing the sealing effect by the tight fit function; by arranging the metal cover ring 502, the probability of the sealing ring 501 being worn is reduced, thereby reducing the possibility of leakage.

[0032] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A knife-type gate valve structure, characterized in that: include: A double plate valve seat (100); and A valve plate (400) disposed at the center of the double-plate valve seat (100); in Flanges (200) are fixed on both sides of the double-plate valve seat (100); and A through hole (300) is formed between the flange (200) and the double-plate valve seat (100); and A flow isolation component (500) is arranged on the valve plate (400); wherein The flow isolation component (500) abuts against the inner wall of the double-plate valve seat (100).

2. The knife-type gate valve structure according to claim 1, characterized in that: The valve plate (400) is provided with a limiting annular groove (401); wherein Part of the flow isolation component (500) is embedded in the limiting ring groove (401).

3. The knife-type gate valve structure according to claim 2, characterized in that: The flow isolation component (500) comprises a sealing ring (501); wherein Part of the sealing ring (501) is embedded in the limiting ring groove (401).

4. The knife-type gate valve structure according to claim 3, characterized in that: The vertical cross section of the sealing ring (501) is in a transverse "T" shape.

5. The knife-type gate valve structure according to claim 4, characterized in that: The sealing ring (501) comprises a supporting portion (5011); wherein The supporting portion (5011) is arranged in the limiting ring groove (401).

6. The knife-type gate valve structure according to claim 5, characterized in that: A first extension portion (5012) and a second extension portion (5013) are provided on one side of the support portion (5011); wherein The sum of the widths of the first extension portion (5012) and the second extension portion (5013) is greater than the width of the support portion (5011); and The first extension portion (5012) and the second extension portion (5013) are arranged outside the limiting ring groove (401).

7. The knife-type gate valve structure according to claim 6, characterized in that: The first extension portion (5012) has a built-in surface (5014).

8. The knife-type gate valve structure according to claim 7, characterized in that: The second extension portion (5013) has an external leakage surface (5015).

9. The knife-type gate valve structure according to claim 8, characterized in that: A metal cover ring (502) is provided at the edge of the first extension portion (5012); wherein Part of the inner wall of the metal cover ring (502) overlaps with the inner surface (5014).

10. The knife-type gate valve structure according to claim 9, characterized in that: An edge of one end of the metal cover ring (502) facing the limiting ring groove (401) is provided with a chamfer.

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