Gate valve with internal self-tightening sealing structure

Abstract

The invention discloses a gate valve with an internal self-tightening sealing structure, and relates to the technical field of valves, the gate valve comprises a valve shell which is connected with a pipeline and can limit and guide a valve plate, a turntable screw rod used for controlling the valve plate to move up and down, and a matching block which is connected with the turntable screw rod and enables the valve plate to move. And the self-adjusting tightening mechanism can ensure the contact tightness between the valve plate and the valve shell. By means of the up-and-down movement mode of the flashboard, the tight face in the flashboard can rotate in the up-and-down movement process, the phenomenon that local abrasion is serious due to the fact that a fixed point is scoured is avoided in the medium circulation and scouring process, and then after long-time use or inevitable abrasion occurs, the flashboard can be prevented from being abraded, and the service life of the flashboard is prolonged. The contact effect can be automatically detected and judged, so that the contact effect between the tight surface and the valve shell is determined, if the contact effect becomes poor, the position of the tight surface can be adjusted at the moment, and the contact effect between the valve shell and the tight surface is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a gate valve with an internal self-tightening sealing structure. Background Art

[0002] The gate valve is an opening and closing component, the gate disc, the movement direction of the gate disc is perpendicular to the direction of the fluid, and the gate valve can only be adjusted to fully open and fully closed.

[0003] During the use of existing gate valves, the handwheel is turned, which drives the screw to rotate, thereby driving the valve plate to move up and down. Gate valves are divided into non-rising stem gate valves and rising stem gate valves (the screw and gate plate of the non-rising stem gate valve are threadedly connected, the gate plate moves up and down, and the screw does not move, while the rising stem gate valve is a gate valve in which the screw drives the gate plate to move synchronously). This is explained for the non-rising stem gate. During the opening and closing process, the water flow remains unchanged, but the opening becomes smaller. At this time, the water flow has begun to flow, so the water flow will impact the surface of the valve plate (at this time, the water flow mainly flows through the flow gap between the valve plate and the valve body. At this time, the water flow mainly impacts the lower part of the valve plate, and relatively speaking, the lower part is affected by the medium much more than the other parts), causing the sealing surface of the valve plate to wear rapidly. , especially in liquids containing medium particles, which will cause the wear of the valve plate to increase. At the same time, during the opening process, the water flow will not only impact the valve plate, but also impact the sealing surface on the valve seat that seals with the valve plate, especially in channels that need to be started frequently. At this time, the sealing surface wear between the valve plate and the valve seat will be accelerated, thereby affecting the sealing effect (when fully closed, there is no medium flowing at this time, so the valve plate and the valve seat will not be flushed, and the sealing surface will not be worn. When fully opened, the valve plate moves to the top of the valve seat, so that the valve seat forms a complete channel, and the bottom of the valve plate is in contact with the valve seat. At this time, the medium will not flush the valve plate surface, so there will be no scouring wear. Therefore, wear mainly occurs during the opening and closing process). Summary of the Invention

[0004] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. The embodiment of the present invention provides a gate valve with an internal self-tightening sealing structure to solve the technical problem that the existing gate valve is affected by its structural form and working environment, resulting in local wear on its sealing surface, and the sealing surface cannot be self-adjusted after wear to ensure a tight effect.

[0005] An embodiment of the present invention adopts the following technical solution: a gate valve with an internal self-tightening sealing structure, including a valve housing connected to a pipeline and capable of limiting and guiding the valve plate, a turntable screw for controlling the up and down movement of the valve plate, and a mating block connected to the turntable screw to enable the valve plate to move, characterized in that; it also includes a self-adjusting tightness mechanism that can ensure the contact tightness between the valve plate and the valve housing.

[0006] Furthermore, the self-adjusting tight mechanism includes two adjustable contact components and a self-adjusting tight component. The adjustable contact components are distributed in the order of a tight surface, a mating valve plate and a fixed valve plate from the outside to the inside. The fixed valve plate is connected to the mating block. A connecting screw is provided at the center of the tight surface. A connecting sleeve is rotatably connected at the center of the mating valve plate. The connecting sleeve and the connecting screw are threadedly connected. A mating gear is provided on the outer ring of the tight surface. A mating rack meshing with the mating gear is provided in the valve housing. The mating rack and the valve housing are connected by a movable guide block. A plurality of limiting grooves are provided on the mating valve plate.

[0007] Furthermore, the connecting sleeve adopts a hollow design, and a plurality of interference blocks used in conjunction with the limiting grooves are arranged throughout the connecting sleeve, and the interference blocks and the inner wall of the connecting sleeve are connected by a reset spring block.

[0008] Furthermore, the self-adjusting tight assembly includes two interference blocks arranged on the tight surface and the bottom of the mating valve plate, and the two interference blocks are connected by a compressible plastic block. The compressible plastic block is in contact with the extrusion cavity, and the extrusion cavity is located in the installation groove opened by the mating valve plate. The extrusion block is slidably connected to one side of the connecting sleeve, and a hydraulic telescopic rod is provided on the outside of the extrusion block. The hydraulic telescopic rod is connected to the fixed valve plate, and the hydraulic telescopic rod and the extrusion cavity are connected by a connecting pipe.

[0009] Furthermore, in the initial state, the resistance block is located in the connecting sleeve. At this time, the resistance block does not restrict the rotation of the connecting sleeve, and the contact surface between the resistance block and the extrusion block is an arc surface.

[0010] Furthermore, the contact surface between the tight surface and the abutment block is an arc surface.

[0011] Compared with the prior art, the present invention has the following beneficial effects: First, the self-adjusting tight mechanism allows the valve plate to rotate when it moves up and down, and the tight surface that actually acts as a contact seal with the valve housing can rotate. When the tight surface rotates during movement, the lower bottom surface of the tight surface is constantly changing, which means that the lower bottom surface that is mainly washed by the medium is not a fixed part, but is constantly rotating and can be washed as a whole, thereby avoiding the lower bottom surface of the fixed point from being washed, causing uneven wear of a certain part. Secondly, although the valve plate can balance the wear by rotating itself during the up and down movement, it may still be worn to a certain extent by the influence of the circulating medium, resulting in a poor contact effect between the valve plate and the valve housing. At this time, the self-adjusting tight component provided therein can appropriately change the position of the tight surface, so that the gap between the tight surface and the valve housing does not change substantially, thereby reducing the impact of the wear of the tight surface caused by the erosion of the medium; To sum up, by utilizing the up and down movement of the gate, the tight surface inside the gate can rotate at the same time during the up and down movement, so that in the process of medium circulation and scouring, the occurrence of severe local wear caused by the scouring of the fixed point can be avoided. Secondly, after long-term use, wear is still inevitable, and the contact effect can be automatically detected and judged to determine the contact effect between the tight surface and the valve housing. If the contact effect deteriorates, the position of the tight surface can be adjusted to ensure the contact effect between the valve housing and the tight surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are 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 work.

[0013] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 3 Schematic diagram of the self-adjusting tight mechanism structure of the present invention; Figure 4 This is a schematic diagram of the first perspective of the tight surface, the matching valve plate and the fixed valve plate of the present invention; Figure 5 This is a schematic diagram of the first perspective of the tight surface, the matching valve plate and the fixed valve plate of the present invention; Figure 6 This is a schematic diagram of the tight surface and matching valve plate structure of the present invention; Figure 7 For the present invention Figure 5 A in the middle is an enlarged structural diagram; Figure 8 For the present invention Figure 5 Enlarged structural diagram at point B in the middle.

[0014] Reference numerals: 1. Valve housing; 2. Turntable screw; 3. Matching block; 4. Self-adjusting tight mechanism; 41. Matching rack; 42. Movable guide block; 43. Matching gear; 44. Tightening surface; 45. Matching valve plate; 46. Fixed valve plate; 47. Connecting screw; 48. Reset spring block; 49. Connecting sleeve; 410. Limiting groove; 411. Limiting block; 412. Extrusion block; 413. Hydraulic telescopic rod; 414. Resistance block; 415. Compressible plastic block; 416. Connecting pipe; 417. Extrusion cavity. DETAILED DESCRIPTION

[0015] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention.

[0017] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0020] The following combination Figures 1 to 8As shown, an embodiment of the present invention provides a gate valve with an internal self-tightening sealing structure, including a valve housing 1 connected to a pipeline and capable of limiting and guiding the valve plate, a turntable screw 2 for controlling the up and down movement of the valve plate, and a mating block 3 connected to the turntable screw 2 to enable the valve plate to move, characterized in that; it also includes a self-adjusting tightness mechanism 4 that can ensure the contact tightness between the valve plate and the valve housing 1.

[0021] During operation, the self-adjusting mechanism inside it adds a motion state to the gate that moves up and down, that is, rotation, so that when the medium flows, the flushing point will always change, avoiding the flushing point position being fixed, causing wear at the local position in the back and forth for a long time, while the other positions are not worn, making the sealing effect worse.

[0022] Specifically, the self-adjusting tight mechanism 4 includes two adjustable contact components and a self-adjusting tight component. The adjustable contact components are distributed in the order of a tight surface 44, a mating valve plate 45 and a fixed valve plate 46 from the outside to the inside. The fixed valve plate 46 is connected to the mating block 3. A connecting screw 47 is provided at the center of the tight surface 44. A connecting sleeve 49 is rotatably connected at the center of the mating valve plate 45. The connecting sleeve 49 and the connecting screw 47 are threadedly connected. A mating gear 43 is provided on the outer ring of the tight surface 44. A mating rack 41 meshing with the mating gear 43 is provided in the valve housing 1. The mating rack 41 and the valve housing 1 are connected by a movable guide block 42. A plurality of limiting grooves 410 are provided on the mating valve plate 45.

[0023] During operation, a matching gear 43 is provided on the tight surface 44, and a matching rack 41 is provided inside the valve housing 1, so that when the valve plate moves up, the matching rack 41 will cause the matching gear 43 to generate a rotational force, that is, the valve plate will move up and down and rotate, thereby changing the flushing point, and it should be noted that at this time the position of the matching rack 41 will actually cause the movement distance of the tight surface 44 to increase appropriately, that is, when the tight surface 44 has blocked the medium, the tight surface 44 also has the function of moving an additional distance, that is, the actual size of the tight surface 44 is larger than the size of the flow pipe of the valve housing 1, so that the end of the channel in the valve housing 1 for the tight surface 44 to move up and down will also be larger than the size of the channel of the valve housing 1, as shown in the figure.

[0024] Specifically, the connecting sleeve 49 adopts a hollow design, and a plurality of resistance blocks 414 used in conjunction with the limiting groove 410 are set through the connecting sleeve 49, and the resistance blocks 414 and the inner wall of the connecting sleeve 49 are connected by a reset spring block 48.

[0025] During operation, as known from the previous description, the tight surface 44 needs to be able to rotate and change position at the same time, and the tight surface 44 and the matching valve plate 45 are connected by a connecting sleeve 49. Therefore, during the up and down movement, the tight surface 44 rotates. At this time, the connecting sleeve 49 and the matching valve plate 45 are simply rotated. The rotation of the tight surface 44 drives the connecting sleeve 49 to rotate, so that the tight surface 44 can rotate normally. When the position needs to be adjusted, the resistance block 414 is inserted into the limiting groove 410. At this time, the connecting sleeve 49 is connected to the matching valve plate 45 to fix the position. At this time, the tight surface 44 rotates and the position changes, thereby realizing the position adjustment of the tight surface 44.

[0026] Specifically, the self-adjusting tight assembly includes two interference blocks 414 arranged at the bottom of the tight surface 44 and the mating valve plate 45. The two interference blocks 414 are connected by a compressible plastic block 415. The compressible plastic block 415 is in contact with the extrusion cavity 417. The extrusion cavity 417 is located in the installation groove opened by the mating valve plate 45. The extrusion block 412 is slidably connected to one side of the connecting sleeve 49. A hydraulic telescopic rod 413 is provided on the outside of the extrusion block 412. The hydraulic telescopic rod 413 is connected to the fixed valve plate 46. The hydraulic telescopic rod 413 and the extrusion cavity 417 are connected by a connecting pipe 416.

[0027] Specifically, in the initial state, the resistance block 414 is located in the connecting sleeve 49 . At this time, the resistance block 414 does not restrict the connecting sleeve 49 from rotating, and the contact surface between the resistance block 414 and the extrusion block 412 is an arc surface.

[0028] Specifically, the contact surface between the tight surface 44 and the abutment block 414 is an arc surface.

[0029] During operation, it is easy to resist and contact in multiple aspects, ensuring the real-time movement state. (For ease of understanding, in some places in the text, the tight surface 44, the matching valve plate 45 and the fixed valve plate 46 may be collectively referred to as the valve plate) Working principle: The valve body is arranged in a pipeline, and the two ends of the valve housing 1 are respectively connected to the pipeline. When medium circulation is required, the rotary screw 2 is rotated, so that the matching block 3 connected to the screw on the rotary screw 2 drives the self-adjusting tight mechanism 4 to rise (that is, the tight surface 44, the matching valve plate 45 and the fixed valve plate 46 rise synchronously). During the rising process of the self-adjusting tight mechanism 4, the matching gear 43 on the end face of the tight surface 44 is engaged with the matching rack 41, and the matching rack 41 does not rise synchronously. Therefore, the tight surface 44 is affected by the engagement of the side wall during the rising process, and the tight surface 44 will rotate. When the tight surface 44 rotates, the wear on the tight surface 44 caused by the flow of medium is not a fixed point (in the process of opening the valve, the valve plate moves from bottom to top. At this time, the medium flows through the gap formed by the valve plate and the valve housing 1, so that the relatively lower position of the tight surface 44 will be flushed during the flow of the medium. When the tight surface 44 can rotate, the downward point will always change its position); When the tight surface 44 moves from top to bottom, the tight surface 44 will also deflect, thereby dispersing the degree of wear. When the tight surface 44 completely blocks the valve housing 1 channel, that is, the tight surface 44 and the corresponding sealing surface of the valve housing 1 are in a corresponding state, since the diameter of the tight surface 44 is much larger than the inner diameter of the channel, the tight surface 44 still has a certain amount of movement space. At this time, after the tight surface 44 has not been worn, when it continues to move downward, the resistance block 414 resists the bottom of the valve housing 1, and the resistance block 414 compresses the compressible plastic block 415 (the compressible plastic block 415 requires a certain amount of force to complete the compression), ensuring that the tight surface 44 can move into place normally. However, due to years of use, wear is inevitable under long-term erosion, which indicates that there is a certain gap between the tight surface 44 and the valve housing 1. Therefore, when pressed down, when the compressible plastic shrinks, the resistance block 414 will be completely The piston rod 410 is pressed against the piston rod 414 and the piston rod 416 is pressed against the piston rod 417, and the piston rod 417 is pressed against the piston rod 418. The piston rod 410 is pressed against the piston rod 418 and the piston rod 416 is pressed against the piston rod 419.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gate valve with an internal self-tightening sealing structure, comprising a valve housing (1) connected to a pipeline and capable of limiting and guiding a valve plate, a rotary screw (2) for controlling the upward and downward movement of the valve plate, and a matching block (3) connected to the rotary screw (2) to enable the valve plate to move, characterized in that; It also includes a self-adjusting tightness mechanism (4) that can ensure the tightness of contact between the valve plate and the valve housing (1).

2. A gate valve with an internal self-tightening sealing structure according to claim 1, characterized in that; The self-adjusting tight mechanism (4) includes two adjustable contact components and a self-adjusting tight component. The adjustable contact components are distributed in the order of a tight surface (44), a matching valve plate (45) and a fixed valve plate (46) from the outside to the inside. The fixed valve plate (46) is connected to the matching block (3). A connecting screw (47) is provided at the center of the tight surface (44). A connecting sleeve (49) is rotatably connected to the center of the matching valve plate (45). The connecting sleeve (49) and the connecting screw (47) are threadedly connected. A matching gear (43) is provided on the outer ring of the tight surface (44). A matching rack (41) meshing with the matching gear (43) is provided in the valve housing (1). The matching rack (41) and the valve housing (1) are connected via a movable guide block (42). A plurality of limiting grooves (410) are provided on the matching valve plate (45).

3. A gate valve with an internal self-tightening sealing structure according to claim 2, characterized in that; The connecting sleeve (49) is hollow in design, and a plurality of resisting blocks (414) for use with the limiting grooves (410) are provided through the connecting sleeve (49), and the resisting blocks (414) and the inner wall of the connecting sleeve (49) are connected via a return spring block (48).

4. A gate valve with an internal self-tightening sealing structure according to claim 2, characterized in that: The self-adjusting tight assembly includes two abutment blocks (414) arranged on the tight surface (44) and the bottom of the matching valve plate (45), the two abutment blocks (414) are connected by a compressible plastic block (415), the compressible plastic block (415) is in contact with an extrusion cavity (417), the extrusion cavity (417) is located in a mounting groove provided in the matching valve plate (45), an extrusion block (412) is slidably connected to one side of the connecting sleeve (49), a hydraulic telescopic rod (413) is provided on the outside of the extrusion block (412), the hydraulic telescopic rod (413) is connected to the fixed valve plate (46), and the hydraulic telescopic rod (413) and the extrusion cavity (417) are connected by a connecting pipe (416).

5. The gate valve with an internal self-tightening sealing structure according to claim 4, characterized in that: In the initial state, the resistance block (414) is located in the connecting sleeve (49). At this time, the resistance block (414) does not restrict the rotation of the connecting sleeve (49), and the contact surface between the resistance block (414) and the extrusion block (412) is an arc surface.

6. The gate valve with an internal self-tightening sealing structure according to claim 4, characterized in that: The contact surface between the tight surface (44) and the abutment block (414) is an arc surface.

Images