Self-positioning and load-dispersing high-temperature butterfly valve sealing structure

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a self-positioning and load-dispersing high-temperature butterfly valve sealing structure which comprises a valve body and a valve shaft, screw rods are fixed at the upper end and the lower end of the valve body, a packing sealing structure and an adjusting structure are arranged on the screw rods, and the valve body and the valve shaft are connected through the adjusting structure and the packing sealing structure. The packing sealing structure comprises a packing gland arranged on the outer side wall of the valve shaft. The butterfly valve is deformed under the high-temperature condition by arranging the adjusting structure of the upper part and the adjusting structure of the lower part, so that the valve shaft can be deformed when moving, the high-temperature torque is prevented from being too large, and due to the packing sealing design of the upper part and the lower part, when packing is used for a too long time, good sealing performance can still be guaranteed due to the existence of the packing adjusting disc spring; and meanwhile, the sliding bearing is arranged in the packing gland, so that the disassembly becomes simple, and in addition, the sliding bearing is made of a special material, so that the seizure condition of the bearing during high-temperature working is effectively prevented.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a self-positioning, load-distributing high-temperature butterfly valve sealing structure. Background Technology

[0002] High-temperature butterfly valves are used in exhaust gas treatment systems. They can discharge exhaust gas and air through an actuator and prevent exhaust gas leakage. They also have the advantages of convenient and quick opening and closing and low fluid resistance.

[0003] Existing technologies have the following problems:

[0004] However, the drawback of existing high-temperature butterfly valves is that the deformation of the valve shaft and valve seat between the valve plate and the butterfly plate due to high temperature will increase the torque and affect the sealing effect.

[0005] To address the aforementioned issues, this application proposes a self-positioning, load-distributing high-temperature butterfly valve sealing structure. Utility Model Content

[0006] To address the problems mentioned in the background section, this invention provides a self-positioning, load-distributing high-temperature butterfly valve sealing structure, which features good sealing performance, prevents valve seizure at high temperatures, and reduces valve torque.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a self-positioning, load-distributing high-temperature butterfly valve sealing structure, comprising a valve body and a valve shaft, with screws fixed at both the upper and lower ends of the valve body, and a packing seal structure and an adjustment structure provided on the screws, the valve body and the valve shaft being connected through the adjustment structure and the packing seal structure;

[0008] The packing seal structure includes a packing gland installed on the outer wall of the valve shaft. The packing gland is fixed to the outer wall of the screw by a packing adjusting nut and a packing adjusting disc spring. A sliding bearing is installed inside the packing gland. A packing pad and packing are installed below the packing gland. The packing and packing pad form a closed space between the packing gland and the valve body.

[0009] The adjustment structure includes an adjustment plate, with a flat sliding bearing located below the adjustment plate. The adjustment plate is fixed to the outer wall of the screw by an adjustment nut and an adjustment disc spring.

[0010] As a self-positioning, load-distributing high-temperature butterfly valve sealing structure of this utility model, preferably, threaded holes are provided at both the upper and lower ends of the valve body, and the adjusting pressure plate, the flat sliding bearing and the packing gland are installed on the upper part of the valve body by screws.

[0011] As a self-positioning, load-distributing high-temperature butterfly valve sealing structure of this utility model, preferably, the adjusting pressure plate and the flat sliding bearing are fixed to the upper part of the valve body by adjusting nuts, adjusting disc springs and screws.

[0012] As a self-positioning, load-distributing high-temperature butterfly valve sealing structure of this utility model, preferably, the packing gland is fixed to the upper part of the valve body by a packing adjusting nut, a packing adjusting disc spring and a screw.

[0013] As a self-positioning, load-distributing high-temperature butterfly valve sealing structure of this utility model, preferably, the packing and packing pad are pressed into the inside of the valve body by a packing gland.

[0014] As a self-positioning, load-distributing high-temperature butterfly valve sealing structure of this utility model, preferably, the screw located at the lower part of the valve body is provided with a packing sealing structure and an adjustment structure.

[0015] As a self-positioning, load-distributing high-temperature butterfly valve sealing structure of this utility model, preferably, the screw located at the lower part of the valve body is provided with a packing sealing structure and an adjustment structure.

[0016] As a self-positioning, load-distributing high-temperature butterfly valve sealing structure of this utility model, preferably, it also includes a multi-layer sealing structure, wherein the valve seat is composed of multiple layers of thin sheets.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] By setting the upper and lower adjustment structure, the butterfly valve is deformed under high temperature, which causes the valve shaft to deform when it moves, thus preventing excessive high temperature torque.

[0019] The upper and lower packing seal design ensures good sealing performance even after prolonged use due to the presence of the packing adjustment disc spring. Furthermore, the sliding bearing's placement inside the packing gland facilitates disassembly. Additionally, the special material used in the sliding bearing effectively prevents seizing during high-temperature operation.

[0020] The multi-layer sealing structure of the valve seat allows the valve seat to self-position relative to the butterfly plate. This structure not only effectively prevents the valve from seizing up under high temperature conditions, but also reduces the valve torque, ensuring that the valve can operate normally under high temperature conditions. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a plan view of the present invention;

[0024] Figure 3 In this utility model Figure 2 AA section view;

[0025] In the picture:

[0026] In the picture:

[0027] 100. Valve body;

[0028] 200. Valve shaft;

[0029] 1. Screw; 2. Adjusting nut; 3. Adjusting disc spring; 4. Adjusting pressure plate; 5. Flat sliding bearing; 6. Packing adjusting nut; 7. Packing adjusting disc spring; 8. Packing gland; 9. Sliding bearing; 10. Packing pad; 11. Packing. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1

[0032] like Figures 1 to 3 As shown;

[0033] A self-positioning, load-distributing high-temperature butterfly valve sealing structure includes a valve body 100 and a valve shaft 200. Both the upper and lower ends of the valve body 100 are fixed with screws 1. The screws 1 are provided with a packing seal structure and an adjustment structure. The valve body 100 and the valve shaft 200 are connected through the adjustment structure and the packing seal structure.

[0034] The packing seal structure includes a packing gland 8 disposed on the outer wall of the valve shaft 200. The packing gland 8 is fixed to the outer wall of the screw 1 by a packing adjusting nut 6 and a packing adjusting disc spring 7. A sliding bearing 9 is provided inside the packing gland 8. A packing pad 10 and a packing 11 are disposed below the packing gland 8. The packing 11 and the packing pad 10 form a closed space between the packing gland 8 and the valve body 100. The resulting sealing layer can prevent the leakage of the medium inside the valve body 100 and is suitable for complex working conditions of high temperature media.

[0035] The adjustment structure includes an adjustment plate 4, with a flat sliding bearing 5 located below the adjustment plate 4. The adjustment plate 4 is fixed to the outer wall of the screw 1 by the adjustment nut 2 and the adjustment disc spring 3, which can realize the function of distributing load.

[0036] In this implementation plan: by setting the upper and lower adjustment structure, the butterfly valve is deformed under high temperature, which causes the valve shaft 200 to deform when it moves, thus preventing excessive high temperature torque.

[0037] When the packing 11 has been used for a long time, the upper and lower packing sealing structures can still maintain good sealing performance due to the presence of the packing adjustment disc spring 7. At the same time, since the sliding bearing 9 is inside the packing gland 8, this makes disassembly simple. In addition, the sliding bearing 9 is made of special materials, which effectively prevents the bearing from seizing when working at high temperatures.

[0038] The multi-layer sealing structure of the valve seat design allows the valve seat to self-position relative to the butterfly plate. This structure not only effectively prevents the valve from seizing up under high temperature conditions, but also reduces the valve torque, ensuring that the valve can operate normally under high temperature conditions.

[0039] The valve seat is designed in a multi-layered manner. Its main purpose is to enable the valve seat to move with the butterfly plate during the closing process, thereby achieving a self-positioning function, as shown in the enlarged figure.

[0040] It should be noted that in this embodiment, the valve body 100 is made of stainless steel. The internal medium of the valve body 100 is high-temperature waste gas or air. The valve is used in environments that require high corrosion resistance. Therefore, the valve body 100, the adjustment structure, the packing seal structure, and the multi-layer thin-plate valve seat structure are all made of stainless steel. Stainless steel has high corrosion resistance, which can improve the overall service life of the valve.

[0041] It should be noted that in this embodiment, the sliding bearing 9 has a self-lubricating function, and the filler 11 has a self-lubricating and heat-insulating function.

[0042] In an optional embodiment, threaded holes are provided at both the upper and lower ends of the valve body 100, and the adjusting pressure plate 4, the flat sliding bearing 5 and the packing gland 8 are installed on the upper part of the valve body 100 by means of screws 1.

[0043] In this embodiment, the screw 1 is threaded to the upper and lower ends of the valve body 100 respectively.

[0044] In an optional embodiment, the adjusting plate 4 and the planar sliding bearing 5 are fixed to the upper part of the valve body 100 by the adjusting nut 2, the adjusting disc spring 3 and the screw 1.

[0045] In this embodiment, a specially treated planar sliding bearing 5 is provided between the adjusting pressure plate 4 and the valve shaft 200. When the valve is opened or closed, the planar sliding bearing 5 will rotate accordingly, thereby reducing the torque.

[0046] In an optional embodiment, the packing gland 8 is fixed to the upper part of the valve body 100 by a packing adjusting nut 6, a packing adjusting disc spring 7 and a screw 1.

[0047] In this embodiment, the design of the packing adjustment disc spring 7 makes the packing gland 8 adjustable, and the compression amount can be adjusted, so that the packing 11 can still maintain a good sealing effect after long-term use.

[0048] In an optional embodiment, the packing 11 and packing pad 10 are pressed into the interior of the valve body 100 by a packing gland 8.

[0049] In this embodiment, the packing 11 has the characteristics of high temperature resistance and self-lubricating properties. Its structure is composed of multiple layers of composite packings. One layer is responsible for isolating temperature, and the other layer is a sealing layer responsible for preventing media leakage. This design can prevent temperature from being transferred to the sliding bearing 9, which can reduce the high temperature expansion of the sliding bearing 9 and prevent media leakage.

[0050] In an optional embodiment, the screw 1 located at the lower part of the valve body 100 is provided with a packing seal structure and an adjustment structure.

[0051] In this embodiment, the valve body 100 includes upper and lower parts, and the upper and lower parts are similar in principle. The adjustment pressure plate 4 of the lower part is made of a special material and contacts the valve shaft 200. Since both the upper and lower parts have two structures, the axial load can be distributed.

[0052] In an optional embodiment, a multi-layer sealing structure is also included, wherein the valve seat is composed of multiple layers of thin sheets.

[0053] In this embodiment, the multi-layer sealing structure valve seat is in close contact with the butterfly plate and can move accordingly. The multi-layer thin plate design enables the valve seat to self-position as the butterfly plate opens and closes.

[0054] The working principle and usage process of this utility model are as follows: During use, when the medium inside the flow channel is at a high temperature, the butterfly plate will deform. The design of the multi-layer thin-plate valve seat can reduce torque while ensuring the sealing effect. At the same time, due to the expansion of high-temperature metal, the butterfly plate will not be in the middle position. The design of the upper and lower adjustment pressure plate 4 can be adjusted without disassembling the valve even if the torque suddenly increases during use. High-temperature expansion will also affect the sliding bearing 9, which will greatly increase the probability of valve shaft 200 seizing. The design of special materials makes the probability of this situation infinitely close to zero.

[0055] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A self-positioning, load-distributing high-temperature butterfly valve sealing structure, comprising a valve body (100) and a valve shaft (200), characterized in that: Both the upper and lower ends of the valve body (100) are fixed with screws (1), and the screws (1) are provided with a packing seal structure and an adjustment structure. The valve body (100) and the valve shaft (200) are connected through the adjustment structure and the packing seal structure. The packing seal structure includes a packing gland (8) disposed on the outer wall of the valve shaft (200). The packing gland (8) is fixed to the outer wall of the screw (1) by a packing adjusting nut (6) and a packing adjusting disc spring (7). A sliding bearing (9) is provided inside the packing gland (8). A packing pad (10) and a packing (11) are disposed below the packing gland (8). The packing (11) and the packing pad (10) form a closed space between the packing gland (8) and the valve body (100). The adjustment structure includes an adjustment plate (4), a flat sliding bearing (5) is provided below the adjustment plate (4), and the adjustment plate (4) is fixed to the outer wall of the screw (1) by the adjustment nut (2) and the adjustment disc spring (3).

2. The self-positioning, load-distributing high-temperature butterfly valve sealing structure according to claim 1, characterized in that: The valve body (100) is provided with threaded holes at both the upper and lower ends. The adjusting pressure plate (4), the flat sliding bearing (5) and the packing gland (8) are installed on the upper part of the valve body (100) by screws (1).

3. The self-positioning, load-distributing high-temperature butterfly valve sealing structure according to claim 1, characterized in that: The adjusting pressure plate (4) and the flat sliding bearing (5) are fixed to the upper part of the valve body (100) by adjusting nut (2), adjusting disc spring (3) and screw (1).

4. The self-positioning, load-distributing high-temperature butterfly valve sealing structure according to claim 1, characterized in that: The packing gland (8) is fixed to the upper part of the valve body (100) by the packing adjusting nut (6), the packing adjusting disc spring (7) and the screw (1).

5. The self-positioning, load-distributing high-temperature butterfly valve sealing structure according to claim 1, characterized in that: The packing (11) and packing pad (10) are pressed into the inside of the valve body (100) by the packing gland (8).

6. The self-positioning, load-distributing high-temperature butterfly valve sealing structure according to claim 1, characterized in that: The screw (1) located at the lower part of the valve body (100) is equipped with a packing seal structure and an adjustment structure.

7. The self-positioning, load-distributing high-temperature butterfly valve sealing structure according to claim 1, characterized in that: It also includes a multi-layer sealing structure, wherein the valve seat is composed of multiple layers of thin sheets.

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