Novel precise switch positioning double-pressing-plate fixed type plug valve

Abstract

According to the technical scheme, the novel precise switch positioning double-pressing-plate fixed type plug valve is characterized in that a first pressing plate is matched with a valve rod so that the valve rod can be axially pressed or loosened; the second pressing plate is used for pressing or loosening the filler; a fixing piece is further arranged at the bottom of the valve element, a groove for containing the fixing piece is formed in the valve seat, and the fixing piece is inserted into the groove and is in running fit with the groove; a positioning piece is arranged on the valve rod, a limiting component integrally formed with the valve cover is arranged on the valve cover, the valve rod drives the positioning piece to rotate to abut against the limiting component, and rotation of the valve rod is limited, the technical scheme has the beneficial effects that the positioning piece on the valve rod abuts against the limiting component to achieve accurate switch positioning, and manual judgment errors are eliminated; the first pressing plate presses the valve rod to avoid inner leakage of the valve element, the second pressing plate presses the filler to stop outer leakage, and targeted adjustment is conducted; and the valve core bottom fixing piece is rotationally matched with the groove of the valve seat, so that the valve core is effectively prevented from deviating.

Description

Technical Field

[0001] The utility model relates to the technical field of a valve and related devices thereof, and more specifically, to a novel double-pressure-plate fixed plug valve with precise switch positioning. Background Art

[0002] There are several key technical defects in the actual application of existing plug valves. First, the plug valve sets a positioning plate on the valve stem to make it conflict with the limit component on the valve cover, but there is a gap between the limit component and the valve cover and the strength is not enough. It will loosen or even shift under long-term or frequent switching, resulting in inaccurate switch positioning. Secondly, the sealing structure design is relatively simple and cannot accurately adjust the packing leakage and internal leakage problems. Moreover, under high temperature and high pressure conditions, the valve core is prone to deviation and unilateral extrusion of the sealing bushing, which may not only cause the bushing of the large-diameter valve to be scraped off and cause leakage, but also significantly increase the friction resistance and operating torque during the switching process, causing component scratches.

[0003] Considering the above reasons, how to ensure that there is no gap between the limit component and the valve cover, and at the same time to specifically adjust the packing leakage and internal leakage problems, and avoid fixing the valve core is exactly the problem considered by this application. Utility Model Content

[0004] In view of the shortcomings of the existing technology, a new type of precise switch positioning double pressure plate fixed plug valve is provided. The device can ensure the precise rotation positioning of the plug valve, and can also specifically adjust the packing leakage and internal leakage problems, and can also avoid fixing the valve core.

[0005] To achieve the above purpose, the following technical solution is provided: a novel precise switch positioning double pressure plate fixed plug valve, comprising a valve seat, a valve cover installed on the valve seat, a valve core installed in the valve seat and a valve stem installed on the valve core, wherein the valve stem passes through the valve cover and enters the valve seat to be connected with the valve core;

[0006] The valve stem is sleeved with a first pressing plate and a second pressing plate, and the first pressing plate cooperates with the valve stem to axially press or loosen the valve stem;

[0007] A packing is arranged between the valve cover and the valve stem, and the second pressing plate is used to press or loosen the packing;

[0008] The bottom of the valve core is also provided with a fixing piece, and the valve seat is provided with a groove for accommodating the fixing piece, and the fixing piece is inserted into the groove and rotatably cooperates with the groove;

[0009] The valve stem is provided with a positioning piece, and the valve cover is provided with a limiting component integrally formed with the valve cover. The valve stem drives the positioning piece to rotate and come into conflict with the limiting component, thereby limiting the rotation of the valve stem.

[0010] According to a further optimization of the utility model, a connecting piece is arranged on the valve cover, and at least one bolt is arranged on each of the first pressure plate and the second pressure plate. The bolt passes through the first pressure plate and is threadedly connected to the limiting component, and the bolt passes through the second pressure plate and is threadedly connected to the connecting piece.

[0011] According to a further optimization of the utility model, a connecting piece is provided on the valve cover, and two bolts are provided on the first pressure plate and the second pressure plate. The bolts pass through the first pressure plate and are threadedly connected to the limiting component, and the bolts pass through the second pressure plate and are threadedly connected to the connecting piece, and the bolts are symmetrically arranged on both sides of the valve stem axis.

[0012] In a further optimization of the utility model, a disc spring is provided between the first pressure plate and the corresponding bolt, and a disc spring is provided between the second pressure plate and the corresponding bolt.

[0013] According to a further optimization of the utility model, a compression sleeve is provided between the second compression plate and the packing, and the compression sleeve is used for compensating for the packing seal.

[0014] In a further optimization of the utility model, the contact surface between the second pressing plate and the pressing sleeve is a conical surface.

[0015] According to a further optimization of the utility model, the first pressing plate and the second pressing plate are staggeredly arranged along the circumference of the valve stem.

[0016] In a further optimization of the utility model, a shaft sleeve is further arranged between the fixing piece and the groove, and the fixing piece is rotatably matched with the groove through the shaft sleeve.

[0017] According to a further optimization of the utility model, a partial space is reserved between the fixing member and the bottom of the groove for the valve stem to move when the pressure plate is pressed.

[0018] In a further optimization of the utility model, a locking plate is further provided on the valve stem, and the valve stem drives the locking plate and the positioning plate to rotate synchronously, the locking plate contacts the bolt on the first pressure plate, and the locking plate and the positioning plate cooperate with each other to limit the rotation of the valve stem.

[0019] This technical solution has the following beneficial effects:

[0020] (1) The positioning piece on the valve stem conflicts with the limit component to achieve precise switch positioning, eliminating manual judgment errors;

[0021] (2) The first pressure plate presses the valve stem to prevent internal leakage of the valve core, and the second pressure plate presses the packing to block external leakage, and makes targeted adjustments;

[0022] (3) The rotational coordination between the fixing at the bottom of the valve core and the groove of the valve seat effectively prevents the valve core from deviating. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a schematic diagram of the cross-sectional structure of a new type of precise switch positioning double pressure plate fixed plug valve.

[0024] Figure 2 It is a schematic diagram of a two-dimensional structure in which a positioning piece and a limiting component interfere with each other.

[0025] Figure 3 It is a schematic diagram of a two-dimensional structure in which a locking piece and a limiting component interfere with each other.

[0026] Figure numerals: 1. valve seat; 11. groove; 2. valve cover; 21. limiting component; 22. connecting part; 3. valve core; 31. fixing part; 4. valve stem; 5. positioning plate; 51. protrusion; 6. first pressure plate; 7. second pressure plate; 8. packing; 9. bolt; 10. disc spring; 110. pressing sleeve; 120. shaft sleeve; 130. locking plate. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "bottom surface" and "top surface", "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0028] Reference Figures 1-3 As shown, a novel precise switch positioning double pressure plate fixed plug valve comprises a valve seat 1, a valve cover 2 installed on the valve seat 1, a valve core 3 installed in the valve seat 1, a valve stem 4 installed on the valve core 3 and a valve stem 4 sleeved on the valve stem 4, and the valve stem 4 passes through the valve cover 2 and enters the valve seat 1 to be connected with the valve core 3;

[0029] The valve stem 4 is sleeved with a first pressing plate 6 and a second pressing plate 7, and the first pressing plate 6 cooperates with the valve stem 4 to axially press or loosen the valve stem 4;

[0030] A packing 8 is arranged between the valve cover 2 and the valve stem 4, and the second pressing plate 7 is used to press or loosen the packing 8;

[0031] A fixing member 31 is also provided at the bottom of the valve core 3, and a groove 11 for accommodating the fixing member 31 is provided on the valve seat 1. The fixing member 31 is inserted into the groove 11 and rotates with the groove 11.

[0032] The valve stem 4 is provided with a positioning piece 5 , and the valve cover 2 is provided with a limiting component 21 integrally formed with the valve cover 2 . The valve stem 4 drives the positioning piece 5 to rotate and come into conflict with the limiting component 21 , thereby limiting the rotation of the valve stem 4 .

[0033] The rotation of the valve stem 4 drives the valve core 3 to rotate to open and close the flow channel; the rotational fit between the fixing member 31 and the groove 11 (for example, through a bushing 120 or direct contact) enables the valve core 3 to rotate only around the axis of the valve stem 4 without deviation, ensuring the accurate alignment of the sealing surface. When the first pressing plate 6 axially presses the valve stem 4, it forces the fixing member 31 at the bottom of the valve core 3 to be in close contact with the bottom surface of the groove 11, eliminating the axial movement of the valve core 3 and preventing fluid leakage; when the second pressing plate 7 presses the sealing packing 8, it blocks the fluid from escaping along the connection gap between the packing 8 and other components or impurities from entering the valve stem 4 through the gap, causing damage. When the positioning piece 5 abuts against the limiting member 21 integrally formed on the valve cover 2, the limiting member 21 and the valve cover 2 are integrally formed, with good strength and strong anti-thrust force. During frequent valve opening and closing, the limiting member 21 will not shift, and accurate opening and closing positioning can be achieved. At the same time, the positioning piece 5 can also be provided with a protrusion 51. When the protrusion 51 of the positioning piece 5 abuts against the limiting member 21, when the valve stem 4 rotates to the set position, the protrusion 51 abuts against the limiting member 21 on the valve cover 2 to block the further rotation of the valve stem 4, thereby prompting the operator that the set position limit has been reached. The protrusion 51 can be set to two, and the two protrusions 51 respectively correspond to the limits of the first position and the second position (the first position and the second position can respectively correspond to opening and closing, or states such as half-open), so that when the valve stem 4 rotates to any set position, only one of the protrusions 51 contacts the limiting member 21 on the valve cover 2, reducing the wear of a single protrusion 51. In addition, the alternation of the two protrusions 51 can extend the service life of the positioning piece 5 and avoid the decline in positioning accuracy caused by the long-term wear of a single protrusion 51.

[0034] During optimization, a connecting member 22 is provided on the valve cover 2, and at least one bolt 9 is provided on both the first pressing plate 6 and the second pressing plate 7. The bolt 9 passes through the first pressing plate 6 and is threadedly connected to the limiting member 21, and the bolt 9 passes through the second pressing plate 7 and is threadedly connected to the limiting member 21.

[0035] By tightening the bolt 9 of the first pressing plate 6, the cooperation between it and the limiting member 21 generates a downward pressure, pushing the first pressing plate 6 to press the valve stem 4, making the fixing member 31 of the valve core 3 contact the bottom surface of the groove 11; loosening the bolt 9 releases the pressing state for easy maintenance. The bolt 9 of the second pressing plate 7 cooperates with the connecting member 22 to press the packing 8, and the packing 8 is extruded to be in close fit with the valve cover 2 to seal the connection gap, thereby ensuring that the fluid does not leak and impurities do not flow in.

[0036] During optimization, a connecting member 22 is provided on the valve cover 2, and two bolts 9 are provided on both the first pressing plate 6 and the second pressing plate 7. The bolt 9 passes through the first pressing plate 6 and is threadedly connected to the limiting member 21, and the bolt 9 passes through the second pressing plate 7 and is threadedly connected to the limiting member 21. The bolts 9 are symmetrically arranged on both sides of the axis of the valve stem 4.

[0037] When two symmetrical bolts 9 are tightened synchronously, the first pressing plate 6 applies a uniform axial force to the valve stem 4, avoiding the inclination of the valve stem 4 caused by unidirectional force, ensuring the vertical movement of the valve core 3, and ensuring the sealing performance; the second pressing plate 7 symmetrically presses the packing 8 to prevent unilateral wear of the packing 8. The symmetrical layout can be extended to a circumferentially uniform distribution of four bolts 9 to further optimize the pressure distribution and improve the sealing reliability and the stability of the pressing plate.

[0038] During optimization, a disc spring 10 is arranged between the first pressing plate 6 and the corresponding bolt 9, and a disc spring 10 is arranged between the second pressing plate 7 and the corresponding bolt 9.

[0039] The disc spring 10 is installed between the head of the bolt 9 and the pressing plate after pre-compression. When the packing 8 wears or the sealing gap increases due to temperature change, the elastic energy of the disc spring 10 is released to push the pressing plate to automatically compensate the pressing force, and at the same time absorb the vibration energy to prevent the bolt 9 from loosening.

[0040] During optimization, a bush 110 is arranged between the second pressing plate 7 and the packing 8, and the bush 110 is used to compensate for the sealing of the packing 8.

[0041] When the second pressing plate 7 presses down, the bush 110 evenly transmits the acting force to the packing 8, prompting the packing 8 to closely fit the valve stem 4 and the inner wall of the valve cover 2. When the packing 8 wears, the bush 110 continuously moves downward to fill the gap to ensure sealing.

[0042] During optimization, the contact surface between the second pressing plate 7 and the bush 110 is a conical surface.

[0043] The bottom surface of the second pressing plate 7 and the top surface of the bush 110 adopt a matching conical surface. When the pressing plate presses down, the conical surface decomposes the downward acting force into acting forces in multiple directions, and the acting forces drive the bush 110 to move downward, thereby enhancing the lateral extrusion force on the packing 8 and improving the sealing effect; when the pressing plate is lifted, the conical surface disengages to quickly release the pressure.

[0044] During optimization, the first pressing plate 6 and the second pressing plate 7 are arranged in a circumferential offset along the valve stem 4.

[0045] The first pressing plate 6 and the second pressing plate 7 are circumferentially staggered by a certain angle to avoid interference between the bolts 9 of the first pressing plate 6 and the bolts 9 of the second pressing plate 7 during operation of the bolts 9 of the first pressing plate 6, and improve the convenience of assembly and maintenance. The offset layout optimizes the space utilization rate of the valve cover 2, allowing the use of larger-sized wrench tools, and the offset angle can be adjusted according to the number of bolts 9 to ensure the maximum operating space.

[0046] During optimization, a bushing 120 is further arranged between the fixing member 31 and the groove 11, and the fixing member 31 is rotationally matched with the groove 11 through the bushing 120.

[0047] The bushing 120 is press-fitted into the inner wall of the groove 11. The fixing member 31 rotates within the bushing 120. The bushing 120 can be made of a material with a low coefficient of friction to reduce the resistance during rotation. At the same time, it prevents direct contact between the fixing member 31 and the groove 11, thus avoiding wear. The bushing 120 can be designed as a split type for easy replacement, or an embedded lubricating groove can be provided to store grease.

[0048] During optimization, a part of the space is left between the fixing member 31 and the bottom of the groove 11 for the valve stem 4 to move when pressing the pressing plate.

[0049] A gap is reserved between the bottom of the groove 11 and the lower end face of the fixing member 31. When the first pressing plate 6 presses the valve stem 4, the valve core 3 drives the fixing member 31 to move down until it contacts the bottom surface of the groove 11. After loosening the pressing plate, the gap allows the valve core 3 to slightly lift up, facilitating the replacement of the packing 8 or the disassembly of the valve core 3. The size of the gap can be adjusted according to the stroke of the valve stem 4 and the sealing pre-tightening amount. By setting the gap, it is ensured that the valve core 3 will not be damaged due to excessive downward movement of the first pressing plate 6, and the valve core 3 can be sealed more effectively.

[0050] During optimization, a locking piece 130 is also provided on the valve stem 4. The valve stem 4 drives the locking piece 130 and the positioning piece 5 to rotate synchronously. The locking piece 130 abuts against the bolt 9 on the first pressing plate 6. The locking piece 130 and the positioning piece 5 cooperate with each other to limit the rotation of the valve stem 4.

[0051] The locking piece 130 and the positioning piece 5 are provided to share the abutting force received by the abutting limiting member 21, thereby extending the service life of both the locking piece 130 and the positioning piece 5, and reducing inaccurate positioning caused by wear during long-term or high-frequency opening and closing.

[0052] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A new type of precision switch-positioning double-plate fixed plug valve, characterized in that, It includes a valve seat, a valve cover installed on the valve seat, a valve core installed in the valve seat and a valve stem installed on the valve core, wherein the valve stem passes through the valve cover, enters the valve seat and is connected with the valve core; The valve stem is sleeved with a first pressing plate and a second pressing plate, and the first pressing plate cooperates with the valve stem to axially press or loosen the valve stem; A packing is arranged between the valve cover and the valve stem, and the second pressing plate is used to press or loosen the packing; The bottom of the valve core is also provided with a fixing piece, and the valve seat is provided with a groove for accommodating the fixing piece, and the fixing piece is inserted into the groove and rotatably cooperates with the groove; The valve stem is provided with a positioning piece, and the valve cover is provided with a limiting component integrally formed with the valve cover. The valve stem drives the positioning piece to rotate and come into conflict with the limiting component, thereby limiting the rotation of the valve stem.

2. The novel precision switch-positioning double-clamp fixed plug valve according to claim 1, characterized in that, A connecting piece is arranged on the valve cover, and at least one bolt is arranged on each of the first pressing plate and the second pressing plate. The bolt passes through the first pressing plate and is threadedly connected to the limiting component, and the bolt passes through the second pressing plate and is threadedly connected to the connecting piece.

3. A novel precision switch-positioning double-plate fixed plug valve according to claim 1, characterized in that, A connecting piece is arranged on the valve cover, and two bolts are arranged on the first pressing plate and the second pressing plate respectively. The bolts pass through the first pressing plate and are threadedly connected to the limiting component, and the bolts pass through the second pressing plate and are threadedly connected to the connecting piece. The bolts are symmetrically arranged on both sides of the valve stem axis.

4. A novel precision switch-positioning double-plate fixed plug valve according to any one of claims 2 or 3, characterized in that, A disc spring is arranged between the first pressing plate and the corresponding bolt, and a disc spring is arranged between the second pressing plate and the corresponding bolt.

5. A novel precision switch-positioning double-clamp fixed plug valve according to any one of claims 1, 2, or 3, characterized in that, A compression sleeve is arranged between the second compression plate and the packing, and the compression sleeve is used for compensating the packing seal.

6. A novel precision switch-positioning double-clamp fixed plug valve according to claim 5, characterized in that, The contact surface between the second pressing plate and the pressing sleeve is a conical surface.

7. A novel precision switch-positioning double-clamp fixed plug valve according to any one of claims 1, 2, or 3, characterized in that, The first pressing plate and the second pressing plate are staggered along the circumference of the valve stem.

8. A novel precision switch-positioning double-plate fixed plug valve according to claim 1, characterized in that, A shaft sleeve is also arranged between the fixing piece and the groove, and the fixing piece is rotatably matched with the groove through the shaft sleeve.

9. A novel precision switch-positioning double-clamp fixed plug valve according to claim 8, characterized in that, A partial space is reserved between the fixing member and the bottom of the groove for the valve stem to move when the pressing plate is pressed.

10. A novel precision switch-positioning double-clamp fixed plug valve according to claim 1, characterized in that, The valve stem is also provided with a locking piece, and the valve stem drives the locking piece and the positioning piece to rotate synchronously, and the locking piece contacts with the bolt on the first pressure plate, and the locking piece and the positioning piece cooperate with each other to limit the rotation of the valve stem.

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