Valve rod sealing structure

Abstract

The utility model belongs to the technical field of valve sealing, and discloses a valve rod sealing structure which comprises a packing assembly and a pressing fence, the packing assembly is arranged in a sealing chamber and arranged on the periphery of a valve rod in a sleeved mode, the pressing fence is arranged on the periphery of the valve rod in a sleeved mode, and the pressing fence abuts against the packing assembly in the axial direction of the valve rod. The pressure applying assembly is arranged in the sealing chamber and can apply pressure to the filler assembly, so that the filler assembly deforms and fills the sealing chamber; the packing assembly comprises a gasket arranged on the bottom wall of the sealing chamber, and the gasket is arranged on the periphery of the valve rod in a sleeving mode. The packing is arranged at the top of the gasket, and the packing is arranged on the periphery of the valve rod in a sleeving mode; and the drawing wire is fixedly connected to the gasket, the drawing wire is arranged in the filler in a penetrating mode, and the end, arranged outside the filler, of the drawing wire is wound around the periphery of the valve rod. According to the utility model, the convenience of filler replacement is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve sealing, in particular to a valve stem sealing structure. Background Art

[0002] The hot air valve, cold air valve, flue valve and combustion valve of the blast furnace of the iron smelting plant usually adopt the pressure bar packing sealing method to prevent the gas medium from leaking along the valve stem. When the valve stem is sealed by the pressure bar packing sealing method, the packing is set in the sealing chamber of the valve (also called the packing chamber), and the packing is sleeved on the outer periphery of the valve stem located inside the sealing chamber; the pressure bar is usually sleeved on the outer periphery of the valve stem located outside the sealing chamber and located above the packing. The axial pressure applied by the pressure bar squeezes the packing so that the packing is deformed and fits tightly between the valve stem and the inner wall of the sealing chamber, thereby forming a seal.

[0003] However, the packing will lose its elasticity during long-term use and cannot achieve the sealing effect. At this time, it is necessary to replace the packing. Since the packing is squeezed by the pressure bar, it is time-consuming and laborious to remove and replace the new packing. Usually, a hand hammer flat chisel is used to remove the packing little by little, which is complicated and has low operating efficiency.

[0004] Therefore, it is urgent to propose a valve stem sealing structure to solve the above technical problems. Utility Model Content

[0005] The utility model aims to provide a valve stem sealing structure, which is conducive to improving the convenience of packing replacement.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a valve stem sealing structure, comprising a packing assembly and a pressure bar, wherein the packing assembly is arranged inside a sealing chamber and sleeved on the outer periphery of the valve stem, the pressure bar is sleeved on the outer periphery of the valve stem, the pressure bar abuts against the packing assembly along the axial direction of the valve stem, and can apply pressure to the packing assembly to deform the packing assembly and fill the sealing chamber; the packing assembly comprises:

[0008] A gasket is arranged on the bottom wall of the sealing chamber, and the gasket is sleeved on the outer periphery of the valve stem;

[0009] A packing is arranged on the top of the gasket, and the packing is sleeved on the outer circumference of the valve stem;

[0010] A drawing wire is fixedly connected to the gasket, the drawing wire is passed through the packing, and the end of the drawing wire placed outside the packing is wound around the outer periphery of the valve stem.

[0011] In some embodiments, the number of the drawing wires is set to be multiple, and the multiple drawing wires are arranged at intervals along the circumference of the gasket.

[0012] In some embodiments, the drawn wire is an iron wire.

[0013] In some embodiments, the number of the packing components is set to multiple groups, and the multiple groups of packing components are arranged in sequence along the axial direction of the valve stem.

[0014] In some embodiments, a bolt is provided on the pressure bar, the bolt passes through the pressure bar and a threaded section of the bolt is threadedly connected to the valve body, and rotation of the bolt can drive the pressure bar to move toward one side of the packing assembly.

[0015] In some embodiments, the number of the bolts is plural, and the plurality of bolts are arranged at intervals along the circumference of the pressure bar.

[0016] In some embodiments, the filler is configured as packing.

[0017] In some embodiments, two circles of the packing are disposed on top of the gasket.

[0018] In some embodiments, the gasket is annular, the inner diameter of the gasket is larger than the outer diameter of the valve stem, and the outer diameter of the gasket is smaller than the inner diameter of the sealing chamber.

[0019] In some embodiments, the gasket is composed of two symmetrical half rings, which are welded together.

[0020] Beneficial effects of the utility model:

[0021] The valve stem sealing structure provided by the utility model configures the packing assembly to include a gasket, packing and a drawing wire, so that the packing can be easily and quickly taken out by just pulling the drawing wire. The operation is simple and fast, and it is convenient for users to replace the packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 is a schematic diagram of a valve stem sealing structure provided by an embodiment of the utility model;

[0024] Figure 2 It is a schematic structural diagram of a gasket and a drawing wire provided in an embodiment of the utility model.

[0025] In the figure:

[0026] 1. Packing assembly; 11. Washer; 12. Packing; 13. Drawing wire;

[0027] 2. Press down the fence;

[0028] 3. Sealed chamber;

[0029] 4. Valve stem;

[0030] 5. Bolts. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] like Figure 1 and Figure 2 As shown, the valve stem sealing structure provided in this embodiment includes a packing assembly 1 and a pressure bar 2. The packing assembly 1 is arranged inside the sealing chamber 3 and sleeved on the outer periphery of the valve stem 4. The pressure bar 2 sleeves on the outer periphery of the valve stem 4. The pressure bar 2 abuts against the packing assembly 1 along the axial direction of the valve stem 4 and can apply pressure to the packing assembly 1 so that the packing assembly 1 is deformed and fills the sealing chamber 3. Figure 1 Taking the position in the figure as an example, the pressure bar 2 is located above the packing assembly 1, and the pressure bar 2 applies a downward extrusion force to the packing assembly 1 along the axial direction of the valve stem 4.

[0039] The packing assembly 1 includes a gasket 11, a packing 12 and a drawing wire 13. The gasket 11 is arranged on the bottom wall of the sealing chamber 3, and the gasket 11 is sleeved on the outer periphery of the valve stem 4. The packing 12 is arranged on the top of the gasket 11, and the packing 12 is sleeved on the outer periphery of the valve stem 4. The drawing wire 13 is fixedly connected to the gasket 11, the drawing wire 13 is passed through the inside of the packing 12, and the end of the drawing wire 13 placed outside the packing 12 is wound around the outer periphery of the valve stem 4.

[0040] In specific implementation, the drawing wire 13 is first fixed on the gasket 11, and then the gasket 11 is placed at the bottom of the sealing chamber 3 and sleeved on the outer periphery of the valve stem 4, and then the packing 12 is arranged on the top of the gasket 11, so that the drawing wire 13 is passed through the packing 12 and then wound around the outer periphery of the valve stem 4, so that the drawing wire 13 does not affect the sealing effect of the packing 12. When the packing 12 needs to be replaced, it is only necessary to remove the pressure bar 2, find the drawing wire 13 wound on the valve stem 4, and remove the gasket 11 by pulling the drawing wire 13, and the packing 12 on the top of the gasket 11 can be easily removed along with the gasket 11.

[0041] The valve stem sealing structure provided in this embodiment configures the packing assembly 1 to include a gasket 11, a packing 12 and a pulling wire 13. The packing 12 can be easily and quickly removed by simply pulling the pulling wire 13. The operation is simple and quick, and the user is convenient for replacing the packing 12.

[0042] like Figure 1 As shown, in some embodiments, a bolt 5 is provided on the pressure bar 2, the bolt 5 passes through the pressure bar 2 and the threaded section of the bolt 5 is threadedly connected to the valve body, and the rotation of the bolt 5 can drive the pressure bar 2 to move toward one side of the packing assembly 1.

[0043] With such an arrangement, the pressure bar 2 can apply pressure to the filler assembly 1 by rotating the bolt 5, which has a simple structure and is easy to disassemble; and the pressure applied by the pressure bar 2 can be changed by adjusting the bolt 5, which has high flexibility.

[0044] Furthermore, there are multiple bolts 5, which are arranged at intervals along the circumference of the pressure bar 2. The arrangement of multiple bolts 5 helps to disperse the pressure of the pressure bar 2, so that the packing assembly 1 is more evenly stressed, which is conducive to enhancing the sealing effect.

[0045] Optionally, the plurality of bolts 5 are evenly distributed along the circumference of the pressure bar 2 .

[0046] like Figure 2 As shown, in some embodiments, the number of the pulling wires 13 is set to be multiple, and the multiple pulling wires 13 are arranged at intervals along the circumference of the gasket 11. In this way, the multiple pulling wires 13 can apply tension at multiple positions on the gasket 11, and the user can save more effort in the process of pulling the multiple pulling wires 13 at the same time, and the force on the gasket 11 can be more balanced.

[0047] Optionally, three drawing wires 13 are arranged at intervals along the circumferential direction on the gasket 11, but it is not limited thereto. For example, the number of drawing wires 13 on the gasket 11 can also be set to four, five, etc., depending on actual conditions.

[0048] Optionally, the drawing wire 13 is an iron wire, which has high strength and durability, is not easy to break, and can be bent and deformed, and has high flexibility.

[0049] like Figure 1 As shown, in some embodiments, the number of packing assemblies 1 is set to multiple groups, and the multiple groups of packing assemblies 1 are arranged in sequence along the axial direction of the valve stem 4. By providing multiple groups of packing assemblies 1, when the packing 12 in one group of packing assemblies 1 loses its elasticity and needs to be replaced, the packing assemblies 1 in the remaining groups are not affected and do not need to be replaced, which is conducive to improving replacement efficiency and reducing material waste.

[0050] In this embodiment, three groups of packing assemblies 1 are sequentially arranged inside the sealing chamber 3 along the axial direction of the valve stem 4, but it is not limited to this. In other embodiments, four or five groups of packing assemblies 1 can also be arranged as long as the packing assemblies 1 can fill the sealing chamber 3.

[0051] In some embodiments, the packing 12 is configured as a packing, which can be cut and adjusted according to the actual size of the sealing chamber 3 and the valve stem 4, and has high flexibility.

[0052] For example, the packing 12 may be graphite packing, carbon fiber packing, or the like.

[0053] Furthermore, if Figure 1 As shown, two circles of packing are arranged on the top of the gasket 11. The two circles of packing provide multiple sealing layers, which can better fill the gap, thereby improving the sealing performance of the packing assembly 1 as a whole.

[0054] It can be understood that when a plurality of packing assemblies 1 are sleeved on the outer periphery of the valve stem 4, each packing assemblies 1 includes a washer 11 and two circles of packing.

[0055] Of course, in other embodiments, the packing 12 may also be configured as a packing ring, which is not specifically limited herein.

[0056] In some embodiments, the gasket 11 is annular, the inner diameter of the gasket 11 is larger than the outer diameter of the valve stem 4, and the outer diameter of the gasket 11 is smaller than the inner diameter of the sealing chamber 3. This arrangement can ensure that the gasket 11 is always located inside the sealing chamber 3 to play the role of carrying the packing 12.

[0057] In some embodiments, the gasket 11 is composed of two symmetrical half rings, which are welded together.

[0058] With such a configuration, when assembling the gasket 11, one half ring can be first placed close to the valve stem 4, and then the other half ring can be spliced ​​and welded to the first half ring. After welding, the gasket 11 is sleeved on the outer periphery of the valve stem 4. In this way, there is no need to insert the gasket 11 into the valve stem 4 from the end of the valve stem 4, and assembly is more convenient.

[0059] Optionally, the gasket 11 is made of a 2 mm thick iron plate.

[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Valve stem sealing structure, characterized in that: The invention comprises a packing assembly (1) and a pressure bar (2), wherein the packing assembly (1) is arranged inside a sealing chamber (3) and sleeved on the outer periphery of a valve stem (4), the pressure bar (2) sleeved on the outer periphery of the valve stem (4), the pressure bar (2) abuts against the packing assembly (1) along the axial direction of the valve stem (4), and can apply pressure to the packing assembly (1) so that the packing assembly (1) is deformed and fills the sealing chamber (3); the packing assembly (1) comprises: A gasket (11) is arranged on the bottom wall of the sealing chamber (3), and the gasket (11) is sleeved on the outer circumference of the valve stem (4); A packing (12) is arranged on the top of the gasket (11), and the packing (12) is sleeved on the outer circumference of the valve stem (4); A drawing wire (13) is fixedly connected to the gasket (11), the drawing wire (13) is passed through the interior of the packing (12), and the end of the drawing wire (13) outside the packing (12) is wrapped around the outer periphery of the valve stem (4).

2. The valve stem sealing structure according to claim 1, characterized in that: The number of the drawing wires (13) is set to be multiple, and the multiple drawing wires (13) are arranged at intervals along the circumference of the gasket (11).

3. The valve stem sealing structure according to claim 1, characterized in that: The drawn wire (13) is an iron wire.

4. The valve stem sealing structure according to claim 1, characterized in that: The number of the packing components (1) is set to be multiple groups, and the multiple groups of packing components (1) are arranged in sequence along the axial direction of the valve stem (4).

5. The valve stem sealing structure according to claim 1, characterized in that: The pressure bar (2) is provided with a bolt (5), the bolt (5) passes through the pressure bar (2) and the threaded section of the bolt (5) is threadedly connected to the valve body, and the rotation of the bolt (5) can drive the pressure bar (2) to move toward one side of the packing assembly (1).

6. The valve stem sealing structure according to claim 5, characterized in that: The number of the bolts (5) is multiple, and the multiple bolts (5) are arranged at intervals along the circumference of the pressure bar (2).

7. The valve stem sealing structure according to claim 1, characterized in that: The filler (12) is configured as packing.

8. The valve stem sealing structure according to claim 7, characterized in that: Two circles of packing are arranged on the top of the gasket (11).

9. The valve stem sealing structure according to claim 1, characterized in that: The gasket (11) is annular, the inner diameter of the gasket (11) is larger than the outer diameter of the valve stem (4), and the outer diameter of the gasket (11) is smaller than the inner diameter of the sealing chamber (3).

10. The valve stem sealing structure according to claim 9, characterized in that: The gasket (11) consists of two symmetrical half rings, which are welded together.

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