Axial positioning adjustable valve shaft sealing structure

Abstract

The utility model relates to the technical field of valves, in particular to an axial positioning adjustable valve shaft sealing structure. The structure comprises a rear end cover which is installed on a valve body and located at the lower end of a lower valve shaft, an installation hole is formed in the center of the rear end cover, and the installation hole sequentially comprises an unthreaded hole section and a screw hole section from top to bottom; the adjusting screw is mounted in the mounting hole and sequentially comprises an upper supporting section, a threaded supporting section and a lower supporting section from top to bottom, and the upper supporting section, the threaded supporting section and the lower supporting section are coaxially arranged; the gland is positioned below the rear end cover and is connected with the rear end cover through a fastener; the top of the upper supporting section is provided with an arc-shaped protrusion. The cross section of the lower supporting section is in a long circle shape, a threaded hole matched with the threaded supporting section and an unthreaded hole matched with the lower supporting section are formed in the gland, and the threaded hole and the unthreaded hole are communicated up and down. The butterfly valve effectively solves the technical problem of poor sealing performance of the butterfly valve caused by displacement of the valve shaft due to abrasion of the split clamping ring in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a valve shaft sealing structure with adjustable axial positioning. Background Art

[0002] A valve is a pipeline accessory used to open and close pipelines, control flow direction, and adjust and control the parameters of the conveying medium (such as temperature, pressure, and flow). It can make the medium (liquid, gas, powder, etc.) in the piping and equipment flow or stop, and can accurately control its flow. It is widely used in petrochemical, electric power, metallurgy, environmental protection, food processing, and pharmaceutical fields. It is an important component to ensure the safe and efficient operation of fluid systems.

[0003] Valves can be divided into various types based on their function, structure, and purpose, such as globe valves, gate valves, ball valves, butterfly valves, check valves, and regulating valves. A butterfly valve, among others, uses a disc (disc) as the opening and closing element. The disc rotates around its own axis within the valve body to open, close, or regulate the flow. The relationship between the opening and flow rate of a butterfly valve is essentially linear, making it suitable for applications requiring flow regulation.

[0004] However, during the use of traditional butterfly valves, the split clamping ring will wear out during long-term use, resulting in the failure of the split clamping ring's restraining effect on the valve shaft. The valve shaft and valve plate move up and down during subsequent use, causing the sealing between the valve plate and the valve shaft to deteriorate, thereby shortening the service life of the valve and affecting the normal transportation of the medium. Utility Model Content

[0005] The utility model provides an axially positioned adjustable valve shaft sealing structure to solve the technical problem in the prior art that the valve shaft is displaced due to wear of the split clamping ring, resulting in poor sealing performance of the butterfly valve.

[0006] In order to solve the above problems, the axial positioning adjustable sealing valve shaft structure provided by the present invention adopts the following technical solutions:

[0007] A valve shaft sealing structure with adjustable axial positioning, comprising:

[0008] The rear end cover is mounted on the valve body and is located at the lower end of the lower valve shaft. A mounting hole is provided at the center of the rear end cover. The mounting hole includes a light hole section and a screw hole section from top to bottom.

[0009] an adjusting screw, which is installed in the mounting hole, and the adjusting screw includes, from top to bottom, an upper supporting section, a threaded supporting section, and a lower supporting section, the upper supporting section, the threaded supporting section, and the lower supporting section being coaxially arranged, the radial dimension of the upper supporting section being larger than the radial dimension of the threaded supporting section and being adapted to the radial dimension of the light hole section, the radial dimension of the threaded supporting section being larger than the radial dimension of the lower supporting section and being adapted to the radial dimension of the screw hole section;

[0010] a gland located below the rear end cover and connected to the rear end cover via fasteners;

[0011] The top of the upper support section has an arc-shaped protrusion;

[0012] The cross section of the lower support section is an oblong, and the pressure cover is provided with a threaded hole matching the threaded support section and a light hole matching the lower support section, and the threaded hole and the light hole are connected up and down.

[0013] The beneficial effects of the axially positioning adjustable valve shaft sealing structure provided by the utility model are:

[0014] 1. By setting a rear end cover at the lower end of the lower valve shaft and opening a mounting hole matching the adjusting screw on the rear end cover, the adjusting screw is installed in the mounting hole with its top pressed against the lower valve shaft. The axial position of the lower valve shaft can be adjusted by adjusting the installation position of the adjusting screw in the mounting hole, so that the valve shaft can be quickly reset when it shifts, ensuring the sealing of the butterfly valve.

[0015] 2. By configuring the adjustment screw to include, from top to bottom, a coaxially arranged upper support section, a threaded support section, and a lower support section, and by reducing the radial dimensions of the upper support section, the threaded support section, and the lower support section in sequence, and adapting the radial dimension of the mounting hole to them, a stepped structure can be formed between the light hole section and the screw hole section in the mounting hole, and the upper support section is supported by the screw hole section, thereby preventing the adjustment screw from moving downward during use; similarly, by providing a gland connected to the rear end cover below it, and providing a threaded hole matching the threaded support section and a light hole matching the lower support section on the gland, a stepped structure is formed between the light hole and the threaded hole, and the threaded support section is supported by the wall of the light hole, thereby further preventing the adjustment screw from moving downward during use;

[0016] 3. An arc-shaped protrusion is set on the top of the upper support section so that the arc-shaped protrusion is pressed against the bottom end of the lower valve shaft, reducing the contact area between the adjusting screw and the lower valve shaft, thereby reducing the wear of the bottom end of the lower valve shaft and effectively extending the service life of the lower valve shaft.

[0017] Through the above arrangement, the utility model effectively solves the technical problem in the prior art that the split clamping ring wears out, causing the valve shaft to shift and resulting in poor sealing performance of the butterfly valve.

[0018] Furthermore, the outer periphery of the upper support section is provided with a groove surrounding the surface thereof, and a sealing ring is installed in the groove.

[0019] Furthermore, the sealing ring is an O-ring.

[0020] Furthermore, the number of the fasteners is two, and the two fasteners are respectively located on two opposite sides of the lower support segment.

[0021] Furthermore, the fastener is a bolt.

[0022] Furthermore, a protective cover is provided on the periphery of the gland to protect the gland and the fastener.

[0023] Furthermore, an outer circumference of the gland is provided with an external thread, and an inner thread matching the external thread is provided in the protective cover, and the protective cover is screwed onto the gland.

[0024] Furthermore, an adjusting pressure plate is provided at the connection position between the valve body and the valve plate, and the adjusting pressure plate is connected to the valve body by bolts, so that the horizontal position of the adjusting pressure plate can be adjusted by adjusting the degree of screwing of the bolts into the valve body, thereby adjusting the sealing effect of the seal provided at the connection position between the valve body and the valve plate.

[0025] Furthermore, the rear end cover and the valve body are connected via a connecting piece.

[0026] Furthermore, the connecting member is a bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0028] Figure 1 This is a schematic diagram of the application structure of the axially positioning adjustable valve shaft sealing structure provided by the utility model;

[0029] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0030] Figure 3 for Figure 1 Front view of the middle adjustment screw;

[0031] Figure 4 for Figure 1 Bottom view of the middle adjustment screw.

[0032] Description of reference numerals:

[0033] 1. Rear end cover; 2. Valve body; 3. Lower valve shaft; 4. Upper support section; 5. Threaded support section; 6. Lower support section; 7. Pressure cap; 8. Bolt; 9. Arc-shaped protrusion; 10. O-ring; 11. Protective cover; 12. Adjusting pressure plate; 13. Seal; 14. Upper valve shaft; 15. Valve plate; 16. Split clamp ring; 17. Groove. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that the main idea of ​​the axially positioning adjustable valve shaft sealing structure provided by the utility model is: by arranging an adjustment screw at the lower end of the lower valve shaft to be tightly pressed against it, the adjustment screw includes an upper support section, a threaded support section and a lower support section from top to bottom, and the radial dimensions of the three support sections decrease successively from top to bottom, and a rear end cover is provided, and a light hole section and a screw hole section matching the upper support section and the threaded support section are opened on the rear end cover, and the screw hole section is used as a nut. By adjusting the degree of screwing of the adjustment screw in the screw hole section, the lower valve shaft can be moved up and down, thereby quickly resetting the valve shaft when it shifts.

[0036] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. The numbers of any elements in the drawings are for illustration only and not for limitation, and any names are for distinction only and do not have any limiting meaning.

[0037] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0038] Example 1 of the axially positioning adjustable valve shaft sealing structure provided by the utility model:

[0039] like Figures 1 to 4 As shown, the axially positioning adjustable valve shaft sealing structure includes a rear end cover 1, an adjusting screw and a pressure cover 7, wherein the rear end cover 1 is installed on the valve body 2 and is located at the lower end of the lower valve shaft 3, the pressure cover 7 is installed below the rear end cover 1 and is connected to the rear end cover 1 through fasteners, and the rear end cover 1 is connected to the valve body 2 through a connecting piece, and the adjusting screw passes through the pressure cover 7 and the rear end cover 1 from bottom to top and is tightened against the lower end of the lower valve shaft 3.

[0040] The following describes the structural components of the adjustment screw. From top to bottom, the adjustment screw comprises an upper support segment 4, a threaded support segment 5, and a lower support segment 6. These three segments are coaxially arranged, with the upper support segment 4 having a larger radial dimension than the threaded support segment 5, which in turn has a larger radial dimension than the lower support segment 6.

[0041] Specifically, the top of the upper support section 4 has an arc-shaped protrusion 9, the top of the arc-shaped protrusion 9 abuts against the bottom of the lower valve shaft 3, and the cross section of the lower support section 6 is an oblong.

[0042] Specifically, a groove 17 is provided on the outer periphery of the upper support section 4 and surrounds the surface thereof. A sealing ring is installed in the groove 17 , wherein the sealing ring is an O-ring 10 .

[0043] Specifically, the connecting members and fasteners are both bolts 8 ; there are two fasteners, which are respectively located on opposite sides of the lower support section 6 ; and there are also two connecting members, which are respectively located on opposite sides of the lower valve shaft 3 .

[0044] Next, we'll explain how to install the adjustment screws on the gland 7 and rear end cap 1. A mounting hole is located in the center of the rear end cap 1. From top to bottom, the mounting hole includes a light hole section and a screw hole section. The radial dimensions of the light hole section match those of the upper support section 4, and the radial dimensions of the screw hole section match those of the threaded support section 5. The gland 7 includes a threaded hole that matches the threaded support section 5, and a light hole that matches the lower support section 6. The threaded hole and the light hole are connected vertically. The upper support section 4 is installed in the light hole, the threaded support section 5 is screwed into the screw hole section and the threaded hole, and the lower support section 6 is installed in the light hole.

[0045] In addition, a protective cover 11 is provided on the outer periphery of the pressure cover 7 to protect the pressure cover 7 and the fasteners; an adjusting pressure plate 12 is provided at the connection position between the valve body 2 and the valve plate 15, and the adjusting pressure plate 12 is connected to the valve body 2 by a bolt 8, so that the horizontal position of the adjusting pressure plate 12 can be adjusted by adjusting the degree of screwing of the bolt 8 in the valve body 2, thereby adjusting the sealing effect of the seal 13 provided at the connection position between the valve body 2 and the valve plate 15.

[0046] Specifically, an outer circumference of the gland 7 is provided with an external thread, and a matching internal thread is provided in the protective cover 11 , and the protective cover 11 is screwed onto the gland 7 .

[0047] The working principle of the axially positioned adjustable valve shaft sealing structure provided by the present invention is: when the split clamping ring 16 is worn and the valve shaft and the valve plate 15 are displaced, the protective cover 11 is unscrewed, and then the adjusting screw is rotated to drive the lower valve shaft 3 to move up and down, thereby driving the valve plate 15 and the upper valve shaft 14 to move up and down to reset them. After the reset is completed, the protective cover 11 is screwed onto the pressure cover 7 to complete the adjustment of the axial position of the valve shaft; by adjusting the degree of screwing of the bolt 8 installed on the adjusting pressure plate 12 into the valve body 2, the horizontal position of the adjusting pressure plate 12 can be adjusted, thereby adjusting the sealing effect of the seal 13.

[0048] Example 2 of the axially positioning adjustable valve shaft sealing structure provided by the utility model:

[0049] The main difference between it and Example 1 is:

[0050] In Example 1, the number of fasteners is two.

[0051] In this embodiment, the number of the fasteners is more than two, and the more than two fasteners are evenly spaced around the periphery of the lower support segment.

[0052] Example 3 of the axially positioning adjustable valve shaft sealing structure provided by the utility model:

[0053] The main difference between it and Example 1 is:

[0054] In Example 1, the number of grooves on the upper supporting section is one.

[0055] In this embodiment, the number of grooves on the upper supporting section is two.

[0056] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0057] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. An axially positionable valve shaft sealing structure, characterized in that: include: The rear end cover is mounted on the valve body and is located at the lower end of the lower valve shaft. A mounting hole is provided at the center of the rear end cover. The mounting hole includes a light hole section and a screw hole section from top to bottom. an adjusting screw, which is installed in the mounting hole, and the adjusting screw includes, from top to bottom, an upper supporting section, a threaded supporting section, and a lower supporting section, the upper supporting section, the threaded supporting section, and the lower supporting section being coaxially arranged, the radial dimension of the upper supporting section being larger than the radial dimension of the threaded supporting section and being adapted to the radial dimension of the light hole section, the radial dimension of the threaded supporting section being larger than the radial dimension of the lower supporting section and being adapted to the radial dimension of the screw hole section; a gland located below the rear end cover and connected to the rear end cover via fasteners; The top of the upper support section has an arc-shaped protrusion; The cross section of the lower support section is an oblong, and the pressure cover is provided with a threaded hole matching the threaded support section and a light hole matching the lower support section, and the threaded hole and the light hole are connected up and down.

2. The axially positioning adjustable valve shaft sealing structure according to claim 1, characterized in that: The outer periphery of the upper supporting section is provided with a groove surrounding the surface thereof, and a sealing ring is installed in the groove.

3. The axially positioning adjustable valve shaft sealing structure according to claim 2, characterized in that: The sealing ring is an O-shaped sealing ring.

4. The axially positioning adjustable valve shaft sealing structure according to any one of claims 1 to 3, characterized in that: There are two fasteners, which are respectively located on two opposite sides of the lower support segment.

5. The axially positioning adjustable valve shaft sealing structure according to claim 4, characterized in that: The fastener is a bolt.

6. The axially positioning adjustable valve shaft sealing structure according to any one of claims 1 to 3, characterized in that: A protective cover is provided on the outer periphery of the gland to protect the gland and the fastener.

7. The axially positioning adjustable valve shaft sealing structure according to claim 6, characterized in that: The outer periphery of the gland is provided with an external thread, the inner periphery of the protective cover is provided with an internal thread matching the external thread, and the protective cover is screwed onto the gland.

8. The axially positioning adjustable valve shaft sealing structure according to any one of claims 1 to 3, characterized in that: An adjusting pressure plate is provided at the connection position between the valve body and the valve plate. The adjusting pressure plate is connected to the valve body by bolts, so that the horizontal position of the adjusting pressure plate can be adjusted by adjusting the degree of screwing of the bolts into the valve body, thereby adjusting the sealing effect of the seal provided at the connection position between the valve body and the valve plate.

9. The axially positioning adjustable valve shaft sealing structure according to any one of claims 1 to 3, characterized in that: The rear end cover and the valve body are connected via a connecting piece.

10. The axially positioning adjustable valve shaft sealing structure according to claim 9, characterized in that: The connecting piece is a bolt.

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