Double-positioning structure of plug valve

Abstract

According to the technical scheme, the double-positioning structure of the plug valve is characterized by comprising a valve seat, a valve deck installed on the valve seat, a valve element installed on the valve seat, a pressing plate arranged above the valve deck, a valve rod penetrating through the pressing plate and the valve deck to be connected with the valve element, a handle used for rotating the valve rod and a bolt used for fixing the pressing plate. Comprising a limiting column connected with a valve cover, a positioning assembly and a locking assembly, wherein the positioning assembly and the locking assembly are connected with a valve rod and are coaxially arranged; when the handle drives the positioning assembly and the locking assembly to synchronously rotate to the first position or the second position of the valve element, the positioning assembly abuts against the limiting column, and a gap is formed between the locking assembly and the bolt. After the positioning assembly is abraded, the handle rotates to drive the positioning assembly to abut against the limiting column, and the locking assembly abuts against the bolt, the technical scheme has the beneficial effect that the bolt looseness caused by high-frequency opening and closing of the valve is avoided through mutual cooperation of the positioning assembly and the locking assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of valves and related devices, and more specifically, to a double-positioning structure of a plug valve. Background Art

[0002] In the existing valve opening and closing control technology, generally, when controlling the rotation of a valve, limit components are added, and a component that abuts is added to the valve stem. The abutting component and the limit component cooperate with each other to limit the rotation of the valve stem, so as to achieve the function of quickly rotating to a set position. Generally speaking, there are a large number of bolts on the valve, and some of the bolts have protrusions that cause abutment with the abutting component. Therefore, it is natural to use bolts as the limit components, and at the same time, the positioning piece can be used as the abutting component. The valve stem drives the positioning piece to rotate, so that it abuts against the bolts on the valve body, thereby directly limiting the rotation of the valve stem to the set position. However, during long-term use, the positioning piece and the bolts are prone to wear due to frequent impacts. Especially during high-frequency opening and closing, the bolts are prone to looseness and deformation, and the positioning piece will also show wear and deformation, resulting in the need for secondary fine-tuning when the handle drives the valve to open and close to completely rotate to the set position.

[0003] Combined with the above reasons, how to avoid the loosening of bolts caused by high-frequency opening and closing of the valve is exactly the problem considered in this application. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, a double-positioning structure of a plug valve is provided, and this device can avoid the loosening of bolts caused by high-frequency opening and closing of the valve.

[0005] To achieve the above purpose, the following technical solutions are provided: A double-positioning structure of a plug valve includes a valve seat, a valve cover installed on the valve seat, a valve core installed on the valve seat, a pressing plate arranged above the valve cover, a valve stem passing through the pressing plate and the valve cover and connecting with the valve core, a handle for rotating the valve stem, and bolts for fixing the pressing plate;

[0006] It includes a limit post connected to the valve cover, a positioning component and a locking component connected to the valve stem and arranged coaxially;

[0007] When the handle drives the positioning component and the locking component to rotate synchronously to the first position or the second position of the valve core, the positioning component abuts against the limit post, and there is a gap between the locking component and the bolts;

[0008] When the positioning component is worn, the handle rotates to drive the positioning component to abut against the limit post, and the locking component abuts against the bolts.

[0009] For further optimization of the present utility model, the locking assembly includes a locking piece and a locking member. The locking piece is provided with a locking hole, and the pressing plate is provided with through holes corresponding to the first position and the second position. When the locking piece rotates to make the locking hole correspond to the through hole, the locking member passes through the locking hole and the through hole, restricting the rotation of the locking member and thus restricting the rotation of the valve stem.

[0010] For further optimization of the present utility model, the limit post is provided with a threaded hole for accommodating a bolt. The bolt passes through the pressing plate and is connected to the threaded hole, thereby fixing the pressing plate.

[0011] For further optimization of the present utility model, a disc spring is provided between the bolt and the pressing plate. The bolt passes through the disc spring and the pressing plate in sequence and is connected to the threaded hole.

[0012] For further optimization of the present utility model, the positioning assembly includes a positioning piece. The positioning piece is used to abut against the limit post, and a wear-reducing pad is provided between the positioning piece and the pressing plate to reduce the friction between the positioning piece and the pressing plate.

[0013] For further optimization of the present utility model, an annular groove is provided around the valve stem. The groove is used to accommodate the locking piece and the pressing plate.

[0014] For further optimization of the present utility model, an annular groove is provided around the valve stem. The groove is used to accommodate the pressing plate, the wear-reducing pad and the positioning piece.

[0015] For further optimization of the present utility model, the positioning piece is provided with a protrusion for abutting against the limit post. The protrusion and the limit post cooperate with each other to restrict the rotation of the positioning piece within the range of the first position and the second position.

[0016] The following beneficial effects are achieved in this technical solution: By the mutual cooperation of the positioning assembly and the locking assembly, the loosening of the bolt caused by the high-frequency opening and closing of the valve is avoided. Description of the Drawings

[0017] Figure 1 It is a two-dimensional schematic diagram of a double-positioning structure of a plug valve.

[0018] Figure 2 It is a two-dimensional schematic diagram of a positioning assembly.

[0019] Figure 3 It is a two-dimensional schematic diagram of a locking assembly.

[0020] Reference numerals: 1, valve seat; 2, valve cover; 3, valve core; 4, pressing plate; 41, through hole; 5, valve stem; 51, annular groove; 6, handle; 7, bolt; 8, limit post; 81, threaded hole; 9, positioning component; 91, positioning piece; 911, protrusion; 10, locking component; 101, locking piece; 1011, locking hole; 102, locking member; 11, disc spring; 12, anti-friction pad. Detailed implementation mode

[0021] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0022] Refer to Figures 1-3 As shown, a double-positioning structure of a cock valve includes a valve seat 1, a valve cover 2 installed on the valve seat 1, a valve core 3 installed on the valve seat 1, a pressing plate 4 arranged above the valve cover 2, a valve stem 5 passing through the pressing plate 4 and the valve cover 2 and connecting with the valve core 3, a handle 6 for rotating the valve stem 5, and a bolt 7 for fixing the pressing plate 4;

[0023] It includes a limit post 8 connected with the valve cover 2, a positioning component 9 and a locking component 10 which are connected with the valve stem 5 and arranged coaxially;

[0024] When the handle 6 drives the positioning component 9 and the locking component 10 to rotate synchronously to the first position or the second position of the valve core 3, the positioning component 9 abuts against the limit post 8, and there is a gap between the locking component 10 and the bolt 7;

[0025] When the positioning component 9 is worn, the handle 6 rotates to drive the positioning component 9 to abut against the limit post 8, and the locking component 10 abuts against the bolt 7.

[0026] When the handle 6 drives the positioning component 9 and the locking component 10 to rotate synchronously to the first position or the second position of the valve core 3, the first position and the second position can correspond to the fully open, fully closed or half-open state of the valve core 3, and the specific positions can be set according to actual requirements. When the valve stem 5 rotates, the positioning component 9 abuts against the limit post 8, and the rotation of the valve stem 5 is restricted by restricting the rotation of the positioning component 9. The valve stem 5 restricts the rotation of the locking component 10, so that there is a gap between the locking component 10 and the bolt 7, avoiding the abutment between the locking component 10 and the bolt 7. After the positioning component 9 is worn due to the interaction with the limit post 8, the positioning component 9 and the locking component 10 respectively abut against the corresponding limit post 8 and bolt 7 at the same time, realizing the function of restricting the rotation of the valve stem 5 by the positioning component 9 and the locking component 10 at the same time. The positioning component 9 replaces the restricting function of the locking component 10 at the beginning, avoiding the wear of the locking component 10. When the positioning component 9 is worn to the same position as the locking component 10, they abut at the same time, dispersing the rotational force received by the valve stem 5, and prolonging the service life of the locking component 10 and the bolt 7.

[0027] In the optimization, the locking component 10 includes a locking piece 101 and a locking member 102. The locking piece 101 is provided with a locking hole 1011, and the pressing plate 4 is provided with through holes 41 corresponding to the first position and the second position. When the locking piece 101 rotates to make the locking hole 1011 correspond to the through hole 41, the locking member 102 passes through the locking hole 1011 and the through hole 41, restricting the rotation of the locking member 102 and thus restricting the rotation of the valve stem 5.

[0028] According to Figure 1 and 3 As shown, when the valve core 3 needs to be fixed at a certain position, the handle 6 drives the locking piece 101 to rotate, aligning the locking hole 1011 with the through hole 41 on the pressing plate 4. At this time, the locking member 102 is inserted. The locking member 102 can be a material with hardness such as a pin or a bolt 7. The locking member 102 passes through the locking hole 1011 and the through hole 41 at the same time, preventing the locking piece 101 and the valve stem 5 from rotating. In some special pipelines, it is necessary to ensure that the valve core 3 rotates to a specific position (such as a half-open state or a fully open state). The mutual cooperation of the locking hole 1011 and the through hole 41 enables the positioning component 9 and the locking component 10 to still fix the stability of the valve core 3 at the set position through the locking member 102 even after wear during long-term use. In addition, the corresponding relationship between the locking hole 1011 and the through hole 41 is not limited to the first position and the second position. Multiple groups of locking holes 1011 and through holes 41 should be added or reduced according to the actual situation to adapt to the locking requirements under different conditions.

[0029] In the optimization, the limit post 8 is provided with a threaded hole 81 for accommodating the bolt 7. The bolt 7 passes through the pressing plate 4 and is connected to the threaded hole 81, thereby fixing the pressing plate 4.

[0030] According to Figure 1As shown, the bolt 7 passes through the pressure plate 4 and is screwed into the threaded hole 81 of the limiting column 8. The pressure plate 4 and the limiting column 8 are fastened together by threaded connection, thereby fixing the pressure plate 4. The limiting column 8 also strengthens the stability of the bolt 7, making it difficult for the locking assembly 10 to shake when it collides with the bolt 7.

[0031] In the optimization, a disc spring 11 is provided between the bolt 7 and the pressure plate 4 , and the bolt 7 passes through the disc spring 11 and the pressure plate 4 in sequence and is connected to the threaded hole 81 .

[0032] according to Figure 1 As shown, when the bolt 7 is tightened, the disc spring 11 is compressed and generates a continuous elastic force, which can reduce or offset the impact force of the locking assembly 10, thereby preventing the bolt 7 from loosening. At the same time, the disc spring 11 absorbs the impact force when the valve stem 5 rotates through elastic deformation, reducing the wear on the threaded connection.

[0033] In the optimization, the positioning assembly 9 includes a positioning piece 91, which is used to resist the limiting column 8. A friction-reducing pad 12 is provided between the positioning piece 91 and the pressure plate 4 to reduce the friction between the positioning piece 91 and the pressure plate 4.

[0034] according to Figure 1 As shown, when the positioning piece 91 rotates with the valve stem 5, there is rotational friction between the positioning piece 91 and the pressure plate 4. The friction-reducing pad 12 is placed between the positioning piece 91 and the pressure plate 4, and reduces the sliding friction between the two through its own low friction coefficient, thereby reducing the wear of the positioning piece 91 and the pressure plate 4, thereby extending the service life of the positioning piece 91 and the pressure plate 4.

[0035] In the optimization, an annular groove 51 is provided around the valve stem 5 , and the groove is used to accommodate the locking piece 101 and the pressure plate 4 .

[0036] according to Figure 1 As shown, the annular groove 51 is arranged along the circumference of the valve stem 5, and the locking piece 101 and the pressure plate 4 are embedded in the groove in sequence. The groove limits the separation of the locking piece 101 and the pressure plate 4, ensuring that the components remain tightly fitted when axially compressed to prevent the components from loosening.

[0037] In the optimization, an annular groove 51 is provided around the valve stem 5 , and the groove is used to accommodate the pressure plate 4 , the friction-reducing pad 12 and the positioning piece 91 .

[0038] according to Figure 1 As shown, the annular groove 51 is arranged along the circumference of the valve stem 5, and the pressure plate 4, the friction-reducing pad 12 and the positioning piece 91 are embedded in the groove in sequence. The groove restricts the pressure plate 4, the friction-reducing pad 12 and the positioning piece 91 from separating, ensuring that the components remain tightly fitted when axially compressed to prevent the components from loosening.

[0039] During optimization, the positioning piece 91 is provided with protrusions 911 around its body for abutting against the limiting posts 8. The protrusions 911 cooperate with the limiting posts 8 to limit the rotation of the positioning piece 91 within the range of the first position and the second position.

[0040] According to Figure 2 As shown, due to the abutment between the protrusions 911 of the positioning piece 91 and the limiting posts 8, when the valve stem 5 rotates to the set position, the abutment between the protrusions 911 and the limiting posts 8 blocks the further rotation of the valve stem 5, thereby prompting the operator that the limit position of the set position has been reached. The protrusions 911 can be set to two, and the two protrusions 911 respectively correspond to the limits of the first position and the second position, so that when the valve stem 5 rotates to any set position, only one of the protrusions 911 contacts the limiting post 8, reducing the wear of a single protrusion 911. In addition, the alternation of the two protrusions 911 can extend the service life of the positioning piece 91 and avoid the decline in positioning accuracy caused by the long-term wear of a single protrusion 911.

[0041] The above are only the preferred embodiments of the present invention, and 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 within the protection scope of the present invention.

Claims

1. A double-positioning structure of a plug valve, comprising a valve seat, a valve cover installed on the valve seat, a valve core installed on the valve seat, a pressing plate arranged above the valve cover, a valve rod passing through the pressing plate and the valve cover and connecting with the valve core, a handle for rotating the valve rod, and bolts for fixing the pressing plate, characterized in that, It includes a limit post connected to the valve cover, a positioning component and a locking component that are connected to the valve stem and arranged coaxially; When the handle drives the positioning component and the locking component to rotate synchronously to the first position or the second position of the valve core, the positioning component abuts against the limit post, and there is a gap between the locking component and the bolt; When the positioning component is worn, the handle rotates to drive the positioning component to abut against the limit post, and the locking component abuts against the bolt.

2. The double positioning structure of the plug valve according to claim 1, characterized in that The locking component includes a locking piece and a locking member. The locking piece is provided with a locking hole, and the pressing plate is provided with through holes corresponding to the first position and the second position. When the locking piece rotates to make the locking hole correspond to the through hole, the locking member passes through the locking hole and the through hole to limit the rotation of the locking piece, thereby limiting the rotation of the valve stem.

3. The double positioning structure of the cock valve according to claim 1, characterized in that, The limit post is provided with a threaded hole for accommodating the bolt. The bolt passes through the pressing plate and is connected to the threaded hole to fix the pressing plate.

4. The double-positioning structure of the cock valve according to claim 3, wherein, A disc spring is arranged between the bolt and the pressing plate. The bolt passes through the disc spring and the pressing plate in sequence and is connected to the threaded hole.

5. The double positioning structure of the cock valve according to claim 1, characterized in that, The positioning component includes a positioning piece for abutting against the limit post. A wear-reducing pad is arranged between the positioning piece and the pressing plate to reduce the friction between the positioning piece and the pressing plate.

6. The double positioning structure of the plug valve according to claim 2, characterized in that An annular groove is formed around the valve stem, and the groove is used for accommodating the locking piece and the pressing plate.

7. The double-positioning structure of the plug valve according to claim 5, wherein, An annular groove is formed around the valve stem, and the groove is used for accommodating the pressing plate, the wear-reducing pad and the positioning piece.

8. The double positioning structure of the cock valve according to any one of claims 5 or 7, characterized in that Protrusions for abutting against the limit post are arranged around the positioning piece. The protrusions cooperate with the limit post to limit the rotation of the positioning piece within the range of the first position and the second position.

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