gate

Abstract

The present invention provides a gate valve, which relates to the field of valve technology and solves the technical problem that there is a fluid pressure difference on both sides of the gate plate, and the sealing surface on one side is easily worn seriously, resulting in leakage of the gate valve. The gate valve includes a valve body, a valve stem, and a gate plate connected to one end of the valve stem and used to block or open the fluid channel in the valve body. The valve stem passes through a bracket and a cylinder connected to the valve body in sequence. A displacement piece is connected to the valve stem, and a limiting part is arranged in the bracket. A displacement gap is formed between the limiting part and the top of the inner cavity of the bracket. When the gate valve is opened, the displacement piece can only move in the vertical direction along the limiting part to limit the movement of the valve stem in the vertical direction. When the gate plate rises into the cylinder and the displacement piece rises into the displacement gap, the valve stem can rotate 180° under the action of an external force, and then when the gate plate descends to the position of blocking the fluid channel, the inlet sealing surface and the outlet sealing surface are exchanged. It is prevented that the fluid pressure difference on both sides of the gate plate only wears the sealing surface on one side of the gate plate, and the gate valve is prevented from leaking.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, in particular to a gate valve. Background Art

[0002] The gate valve in the prior art includes a valve body and a gate plate. The fluid flows along the fluid channel in the valve body, and the gate plate seals or opens the fluid channel in the valve body. The surfaces where the gate plate and the valve body are sealed include an inlet sealing surface and an outlet sealing surface, wherein the surface of the gate plate facing the fluid inlet side is called the inlet sealing surface, and the surface of the gate plate facing the fluid outlet side is called the outlet sealing surface.

[0003] The applicant has found that the prior art has at least the following technical problems: during the process of opening and closing the gate, the gate inlet side has a higher pressure than the outlet side, and the outlet sealing surface is often worn or scratched due to the fluid pressure difference. Moreover, the gate valve cannot be repaired in the working state after leakage, and can only be shut down for inspection. If it is used reluctantly without finding wear, the worn parts or scratches may be expanded after being flushed by the pressurized fluid, and the damaged sealing surface may cause greater leakage, which shortens the maintenance interval of the gate valve and causes great economic losses due to equipment shutdown. Summary of the invention

[0004] The purpose of the present invention is to provide a gate valve to solve the technical problem in the prior art that the outlet sealing surface is easily worn seriously due to the fluid pressure difference on both sides of the gate plate, resulting in leakage of the gate valve. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a gate valve, comprising a valve body, a valve stem, and a gate connected to one end of the valve stem and used to block or open a fluid channel in the valve body, wherein:

[0007] The valve stem passes through the bracket and the cylinder connected to the valve body in sequence, the valve stem is connected to a displacement piece, a limiting portion is arranged in the bracket, and a displacement gap is formed between the limiting portion and the top of the inner cavity of the bracket;

[0008] When the gate valve is opened, the shifting member can only move in the vertical direction along the limiting portion to limit the movement of the valve stem in the vertical direction. When the gate plate rises into the cylinder and the shifting member rises into the shifting gap, the valve stem can rotate 180° under the action of external force, and then when the gate plate descends to the position to block the fluid channel, the inlet sealing surface and the outlet sealing surface are exchanged.

[0009] Preferably, the position-changing member is sleeved outside the valve stem, and an open groove is provided on one side or more than two sides of the position-changing member, and the open groove extends in the vertical direction;

[0010] The limiting portion includes a limiting block, which is fixed on the inner wall of the cavity of the bracket and extends in a vertical direction, and the limiting block can extend into the corresponding opening groove.

[0011] Preferably, the transposition member comprises a fixing portion and a matching portion, wherein:

[0012] The fixing portion is fixedly connected to the valve stem, the outer diameter of the matching portion is larger than the outer diameter of the fixing portion, the opening groove is arranged on the matching portion, and the fixing portion is clearance-matched with the limiting portion.

[0013] Preferably, the position change member is formed by connecting a symmetrically arranged first splicing portion and a second splicing portion. After the first splicing portion and the second splicing portion are connected in place, a polygonal through hole for the valve stem to pass through is arranged in the middle of the two, and the opening grooves are spliced ​​on both sides, and the openings of the two opening grooves are arranged back to back.

[0014] Preferably, the gate valve further comprises a hand wheel and a nut portion, wherein:

[0015] The hand wheel is fixedly connected to the nut part, the nut part is fixedly connected to the upper end of the bracket, and the nut part is threadedly connected to the valve stem. When the hand wheel is rotated forward, the valve stem rises in the vertical direction, and when the hand wheel is rotated backward, the valve stem descends in the vertical direction.

[0016] Preferably, the valve body is provided with an opening for the gate plate to extend into, and a limit assembly is also provided at the matching position of the opening of the valve body and the gate plate, and the limit assembly is used to limit the circumferential rotation of the valve stem.

[0017] Preferably, the limit assembly includes a guide block and a guide groove, one of which is arranged on the inner wall of the opening of the valve body, and the other is arranged on the outer wall of the gate plate, and the guide block extends into the corresponding guide groove to limit the circumferential rotation of the valve stem.

[0018] Preferably, the cylinder is formed by connecting two or more cylindrical structures, the upper end of the cylinder is sealed by a cylinder cover, adjacent cylinders are locked by a bolt assembly, and sealing gaskets are clamped and fixed between adjacent cylinders.

[0019] Preferably, both the inlet sealing surface and the outlet sealing surface are wedge-shaped surfaces arranged obliquely relative to the fluid channel.

[0020] Preferably, a pressing sleeve is provided on the cylinder cover, a pressing plate is provided at the end of the bracket, at least part of the pressing plate extends into the pressing sleeve, and the two are sealed and fixed, and a lubricating filler is filled between the pressing plate and the pressing sleeve.

[0021] Compared with the prior art, the gate valve provided by the present invention has the following beneficial effects: when the gate valve is opened, the displacement piece can only move in the vertical direction along the limiting portion, thereby limiting the movement of the valve stem in the vertical direction, and then enabling the gate to open the fluid channel of the valve body, and the valve stem continues to rise. When the gate rises into the cylinder and the displacement piece rises into the displacement gap, the valve stem is rotated 180° to close the gate. In this way, when the gate descends to the position to re-seal the fluid channel, the original inlet sealing surface becomes the outlet sealing surface, and the original outlet sealing surface becomes the inlet sealing surface, which can prevent the fluid pressure difference on both sides of the gate from only wearing the sealing surface on one side of the gate, and prevent the outlet sealing surface of the gate from being damaged by the scouring of the fluid for a long time, resulting in more serious wear parts, thereby preventing the gate valve from leaking to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of the gate valve;

[0024] Figure 2 It is a schematic diagram of the local structure of the gate;

[0025] Figure 3 is a schematic diagram of the side view structure of the transposition member;

[0026] Figure 4 1 is a schematic diagram of the top view of the transposition member;

[0027] Figure 5 It is a schematic diagram of the top view of the valve body;

[0028] Figure 6 It is a schematic diagram of the gate structure from a top view.

[0029] In the figure, 1 is the valve body; 100 is the fluid channel; 101 is the guide block; 102 is the opening; 2 is the gate; 201 is the inlet sealing surface; 202 is the outlet sealing surface; 203 is the guide groove; 3 is the valve stem; 4 is the sealing gasket; 5 is the bolt assembly; 6 is the cylinder; 7 is the cylinder cover; 8 is the cotter pin; 9 is the nut; 10 is the bracket; 11 is the nut part; 12 is the bearing cover; 13 is the hand wheel; 14 is the locking nut; 15 is the flat key; 16 is the pressure plate; 17 is the pressure sleeve; 18 is the packing; 19 is the transposition part; 191 is the matching part; 192 is the fixing part; 193 is the opening groove; 194 is the multi-angle through hole; 195 is the bolt hole; 196 is the first splicing part; 197 is the second splicing part; 20 is the limit block; 21 is the transposition gap. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] The embodiment of the present invention provides a gate valve, which can prevent the outlet sealing surface of the gate plate 2 from being damaged by the scouring of the fluid for a long time, resulting in more serious wear of the parts, thereby preventing the gate valve from leaking to a certain extent.

[0033] Combine the following Figure 1-Figure 6 The technical solution provided by the present invention is described in more detail.

[0034] like Figure 1-Figure 6As shown, this embodiment provides a gate valve, including a valve body 1, a valve stem 3 and a gate plate 2 connected to one end of the valve stem 3 and used for blocking or opening a fluid channel 100 in the valve body 1, wherein: the valve body 1 is connected to a cylinder 6, the cylinder 6 is connected to a bracket 10, and there are cavities in the bracket 10 and the cylinder 6, the valve stem 3 passes through the bracket 10 and the cylinder 6 connected to the valve body 1 in sequence, the valve stem 3 is connected to a transposition member 19, a limiting portion (limiting block 20) ​​is arranged in the bracket 10, and a transposition gap 21 is formed between the limiting portion (limiting block 20) ​​and the top of the inner cavity of the bracket 10; when the gate valve is opened, the transposition member 19 only It can move in the vertical direction along the limiting part (limit block 20) ​​to limit the movement of the valve stem 3 in the vertical direction. When the gate plate 2 rises into the cylinder 6 and the shifting piece 19 rises into the shifting gap 21, the shifting piece 19 and the limiting part (limit block 20) ​​disengage from each other, and the valve stem 3 can rotate 180° under the action of external force. When the gate valve continues to be closed, the shifting piece 19 can only move in the vertical direction along the limiting part (limit block 20), and the gate plate 2 descends in the vertical direction. Then, when the gate plate 2 descends to the position of blocking the fluid channel 100, the inlet sealing surface 201 and the outlet sealing surface 202 are exchanged.

[0035] Among them, Figure 1 As shown in the figure, the fluid flows from left to right in the fluid channel, and the side of the gate 2 facing the fluid inlet is called the inlet sealing surface 201 ( Figure 1 The side of the gate facing the fluid outlet is called the outlet sealing surface 202 ( Figure 1 center right).

[0036] When the position-changing member 19 cooperates with the limiting portion (limiting block 20 ), the two play a role in limiting the movement direction of the valve stem 3 , so that the valve stem 3 can only move in the vertical direction.

[0037] Among them, the function of the transposition gap is: when the valve stem 3 moves vertically upward and the transposition member 19 moves into the transposition gap 21, it can be separated from the limiting part (limit block 20). After losing the blocking effect of the limiting part (limit block 20), the valve stem 3 is rotated, and the valve stem 3 rotates 180° on the horizontal plane. Then the gate valve is closed, and the gate plate 2 drops back to the position of blocking the fluid channel 100, so that the original inlet sealing surface 201 can be changed into the outlet sealing surface 202, and the original outlet sealing surface 202 can be changed into the inlet sealing surface 201.

[0038] For the gate valve of this embodiment, when the gate valve is opened, the displacement member 19 can only move in the vertical direction along the limiting portion, thereby limiting the movement of the valve stem 3 in the vertical direction, so that the gate plate 2 can open the fluid channel 100 of the valve body 1, and the valve stem 3 continues to rise. When the gate plate 2 rises into the cylinder 6 and the displacement member 19 rises into the displacement gap 21, the valve stem 3 is rotated 180° to close the gate plate 2. In this way, when the gate plate 2 descends to the position to re-block the fluid channel 100, the original inlet sealing surface 201 becomes the outlet sealing surface 202, and the original outlet sealing surface 202 becomes the inlet sealing surface 201, which can prevent the fluid pressure difference on both sides of the gate plate 2 from only wearing the outlet sealing surface 202 of the gate plate 2, and prevent the outlet sealing surface 202 of the gate plate 2 from being eroded and damaged by the fluid for a long time, resulting in more serious wear parts, thereby preventing the gate valve from leaking to a certain extent.

[0039] As an alternative embodiment, see Figure 1-Figure 4 As shown, the position change member 19 of this embodiment is sleeved outside the valve stem 3, combined with Figure 2 and Figure 4 , an opening slot 193 is provided on one side or on both sides of the transposition member 19, and the opening slot 193 extends in the vertical direction; see Figure 4 The limiting portion includes a limiting block 20 , which is fixed on the inner wall of the cavity of the bracket 10 and extends in the vertical direction, and the limiting block 20 can extend into the corresponding opening groove 193 .

[0040] Since the above-mentioned limit block 20 is fixed in the cavity of the bracket 10 and arranged vertically, the opening groove 193 of the position change member 19 extends in the vertical direction. When the two cooperate with each other, they play a guiding role, so that the valve stem 3 can only move in the vertical direction and cannot rotate in the circumferential direction.

[0041] As an optional implementation, combined with Figure 2 , Figure 3 and Figure 4 As shown, the position change member 19 of this embodiment includes a fixing portion 192 and a matching portion 191, wherein: the fixing portion 192 is fixedly connected to the valve stem 3, the outer diameter of the matching portion 191 is larger than the outer diameter of the fixing portion 192, the opening groove 193 is arranged on the matching portion 191, and the fixing portion 192 is clearance-matched with the limiting portion (limiting block 20).

[0042] The open groove 193 on the matching portion 191 is used for sliding connection with the limit block 20. Since the outer diameter of the matching portion 191 is larger than the outer diameter of the fixing portion 192, when the matching portion 191 of the shifting member 19 moves into the above-mentioned shifting gap 21, the valve stem 3 can be rotated 180° on the horizontal plane, and the structure is more compact.

[0043] As an alternative embodiment, see Figure 3 and Figure 4As shown, the position change member 19 in this embodiment is formed by connecting a symmetrically arranged first splicing portion 196 and a second splicing portion 197. After the first splicing portion 196 and the second splicing portion 197 are connected in place, a polygonal through hole 194 for the valve stem 3 to pass through is arranged in the middle of the two, and open grooves 193 are spliced ​​on both sides, and the openings of the two open grooves 193 are arranged back to back.

[0044] The first joint 196 and the second joint 197 are provided with interconnected bolt holes 195, so that bolts and other locking parts can pass through the corresponding bolt holes 195 to connect the first joint 196 and the second joint 197 to each other, which is convenient for disassembly and assembly. The multi-angle through hole 194 in the middle of the position change member 19 can be interference fit with the valve stem 3, ensuring that when the valve stem 3 rotates, the position change member 19 can also rotate 180° synchronously with the valve stem 3 to prevent relative displacement between the two in the circumferential direction.

[0045] This embodiment provides a specific implementation method for the valve stem 3 to move in the vertical direction. Figure 1 As shown, the gate valve also includes a handwheel 13 and a nut portion 11, wherein: the handwheel 13 is fixedly connected to the nut portion 11, specifically, the handwheel 13 and the nut portion 11 are tightly matched through a flat key 15, the upper end of the handwheel 13 is fixed by a locking nut 14, and a bearing cover 12 is provided between the nut portion 11 and the bracket 10; the nut portion 11 is fixedly connected to the upper end of the bracket 10, and the nut portion 11 is threadedly connected to the valve stem 3, when the handwheel 13 is rotated forward, the valve stem 3 rises in the vertical direction, and when the handwheel 13 is rotated reversely, the valve stem 3 descends in the vertical direction.

[0046] Since the nut portion 11 is fixedly connected to the hand wheel 13, when the hand wheel 13 is turned, the nut portion 11 rotates synchronously with the hand wheel 13, and since the position change member 19 on the valve stem 3 cooperates with the position limiting portion (position limiting block 20) ​​on the bracket 10, the rotation of the valve stem 3 in the circumferential direction is limited, so that the valve stem 3 can only move in the vertical direction. Therefore, the rotation direction of the hand wheel 13 can be changed, and the valve stem 3 can be moved vertically upward to open the fluid channel 100 of the valve body 1, and the valve stem 3 can be moved vertically downward to close the fluid channel 100 of the valve body 1.

[0047] The gate valve of this embodiment cooperates with the limiting portion (limiting block 20) ​​on the bracket 10 through the position change member 19 to limit the rotation of the valve stem 3 in the circumferential direction. Figure 1 and Figure 5 , Figure 6 As shown, the valve body 1 is provided with an opening 102 for the gate plate 2 to extend therein, and a limit assembly is also provided at the matching position of the opening 102 of the valve body 1 and the gate plate 2, and the limit assembly is used to limit the circumferential rotation of the valve stem 3. The limit assembly mainly limits the circumferential rotation of the valve stem 3 through the circumferential rotation of the gate plate 2.

[0048] As an alternative embodiment, see Figure 5 and Figure 6 As shown, the limit assembly includes a guide block 101 and a guide groove 203, one of which is arranged on the inner wall of the opening 102 of the valve body 1, and the other is arranged on the outer wall of the gate plate 2, and the guide block 101 extends into the corresponding guide groove 203 to limit the circumferential rotation of the valve stem 3. Figure 5 and Figure 6 As shown, in this embodiment, the guide block 101 is arranged on the inner wall of the opening 102, and the guide groove 203 is arranged on the outer wall of the gate plate 2. Through the matching structure of the guide block 101 and the guide groove 203, when the hand wheel 13 is rotated, the gate plate 2 is restricted from rotating in the circumferential direction, thereby ensuring that the valve stem 3 can only move in the vertical direction.

[0049] As an alternative embodiment, see Figure 1 As shown, the cylinder 6 is formed by connecting two or more cylindrical structures, the ends of the cylinder 6 are sealed by the cylinder cover 7, the adjacent cylinders 6 are locked by the bolt assembly 5, and the sealing gasket 4 is clamped and fixed between the adjacent cylinders 6 to ensure the sealing performance of the structure. The above structure can extend the vertical length of the cylinder 6, and when the matching portion 191 of the transposition member 19 moves into the transposition gap 21, the gate plate 2 can stay in the cylinder 6.

[0050] As an alternative embodiment, see Figure 1 As shown, both the inlet sealing surface 201 and the outlet sealing surface 202 are wedge-shaped surfaces inclined relative to the fluid channel 100. The inlet sealing surface 201 and the outlet sealing surface 202 of the above structure can ensure the sealing effect of the gate 2 on the fluid channel 100 in the valve body 1.

[0051] As an alternative embodiment, see Figure 1 As shown, the bracket 10 is connected to the cylinder cover 7 by a cotter pin 8 and a nut 9, and a pressing sleeve 17 is provided on the cylinder cover. A pressing plate 16 is provided at the end of the bracket 10, and at least part of the pressing plate 16 extends into the pressing sleeve 17, and the two are sealed and fixed, and a lubricating filler 18 is filled between the pressing plate 16 and the pressing sleeve 17.

[0052] The pressing plate 16 and the pressing sleeve 17 cooperate with each other, and the lubricating filler 18 filled therebetween can weaken the valve stem 3, thereby ensuring that the valve stem 3 can move smoothly.

[0053] In the description of this specification, specific features, structures or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A gate valve, It is characterized in that It comprises a valve body, a valve stem and a gate connected to one end of the valve stem and used to block or open a fluid channel in the valve body, wherein: The valve stem passes through the bracket and the cylinder connected to the valve body in sequence, the valve stem is connected to a displacement piece, a limiting portion is arranged in the bracket, and a displacement gap is formed between the limiting portion and the top of the inner cavity of the bracket; When the gate valve is opened, the shifting member can only move in the vertical direction along the limiting portion to limit the movement of the valve stem in the vertical direction. When the gate plate rises into the cylinder and the shifting member rises into the shifting gap, the valve stem can rotate 180° under the action of external force, and then when the gate plate descends to the position to block the fluid channel, the inlet sealing surface and the outlet sealing surface are exchanged.

2. The gate valve according to claim 1, It is characterized in that The position-changing member is sleeved outside the valve stem, and an opening groove is provided on one side or more than two sides of the position-changing member, and the opening groove extends in the vertical direction; The limiting portion includes a limiting block, which is fixed on the inner wall of the cavity of the bracket and extends in a vertical direction, and the limiting block can extend into the corresponding opening groove.

3. The gate valve according to claim 2, It is characterized in that The transposition member comprises a fixing portion and a matching portion, wherein: The fixing portion is fixedly connected to the valve stem, the outer diameter of the matching portion is larger than the outer diameter of the fixing portion, the opening groove is arranged on the matching portion, and the fixing portion is clearance-matched with the limiting portion.

4. The gate valve according to claim 2, It is characterized in that The position change member is formed by connecting a first splicing part and a second splicing part which are symmetrically arranged. After the first splicing part and the second splicing part are connected in place, a polygonal through hole is arranged in the middle of the two parts for the valve stem to pass through, and the opening grooves are spliced ​​on both sides, and the openings of the two opening grooves are arranged back to back.

5. The gate valve according to claim 1, It is characterized in that The gate valve also includes a hand wheel and a nut part, wherein: The hand wheel is fixedly connected to the nut part, the nut part is fixedly connected to the upper end of the bracket, and the nut part is threadedly connected to the valve stem. When the hand wheel is rotated forward, the valve stem rises in the vertical direction, and when the hand wheel is rotated backward, the valve stem descends in the vertical direction.

6. The gate valve according to claim 1 or 2, It is characterized in that The valve body is provided with an opening for the gate plate to extend into, and a limit assembly is also provided at the matching position of the opening of the valve body and the gate plate, and the limit assembly is used to limit the circumferential rotation of the valve stem.

7. The gate valve according to claim 6, It is characterized in that The limit assembly includes a guide block and a guide groove, one of which is arranged on the inner wall of the opening of the valve body, and the other is arranged on the outer wall of the gate plate. The guide block extends into the corresponding guide groove to limit the circumferential rotation of the valve stem.

8. The gate valve according to claim 1 or 2, It is characterized in that The cylinder is formed by connecting two or more cylindrical structures. The upper end of the cylinder is sealed by a cylinder cover. Adjacent cylinders are locked by bolt assemblies, and sealing gaskets are clamped and fixed between adjacent cylinders.

9. The gate valve according to claim 1 or 2, It is characterized in that The inlet sealing surface and the outlet sealing surface are both wedge-shaped surfaces that are inclined relative to the fluid channel.

10. The gate valve according to claim 8, It is characterized in that A pressing sleeve is arranged on the cylinder cover, a pressing plate is arranged at the end of the bracket, at least part of the pressing plate extends into the pressing sleeve, and the two are sealed and fixed, and a lubricating filler is filled between the pressing plate and the pressing sleeve.

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