A hot blast valve stem seal structure

Abstract

The utility model discloses a hot -blast valve valve rod sealing structure relates to hot -blast valve technical field, including telescopic link, valve cover, valve body, valve rod and valve plate, the valve cover is fixedly connected with valve body and forms sealed cavity, the valve plate sets up in this sealed cavity and can reciprocate sliding to realize the opening and closing of valve, the valve cover is fixedly connected with the sealing cylinder, one end of valve rod is fixedly connected with valve plate, the other end of valve rod penetrates valve cover to the inside of sealing cylinder to be fixedly connected with the piston rod of telescopic link, the bottom of valve cover is equipped with the sealing seat, the inside of sealing seat is equipped with the sealing ring, the sealing ring is set up on the outer circumferential surface of ventilation pipe to realize dynamic sealing. This hot -blast valve valve rod sealing structure, and the sealing effect is good, can effectively avoid medium leakage.

Description

Technical Field

[0001] This utility model relates to the field of hot air valve technology, specifically a hot air valve stem sealing structure. Background Technology

[0002] Hot air valves are key equipment in high-temperature media conveying systems in metallurgy, thermal energy engineering, chemical industry and other fields. They are often used to control the flow of high-temperature hot air, flue gas and other media. Their operating environment is usually characterized by high temperature and dust.

[0003] Existing gate-type hot air valves typically rely on a single sealing ring between the valve stem and the valve body to form a single-stage seal. Once this sealing ring fails, the high-temperature medium will leak directly through the gate gap, affecting the safety of system operation. At the same time, during the reciprocating motion of the valve stem, dust and impurities from the environment easily adhere to its surface. These impurities can easily enter the sealing mechanism with the movement of the valve stem, aggravating the wear of the sealing components and leading to a decrease in sealing performance.

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

[0005] (a) Technical problems to be solved The purpose of this invention is to provide a hot air valve stem sealing structure to solve the problems mentioned in the background art.

[0006] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a hot air valve stem sealing structure, comprising a telescopic rod, a valve cover, a valve body, a valve stem, and a valve plate. The valve cover is fixedly connected to the valve body to form a sealing cavity. The valve plate is disposed within the sealing cavity and can reciprocate to achieve valve opening and closing. A sealing cylinder is fixedly connected to the valve cover. One end of the valve stem is fixedly connected to the valve plate, and the other end of the valve stem penetrates through the valve cover to the interior of the sealing cylinder and is fixedly connected to the piston rod of the telescopic rod. A sealing seat is provided at the bottom of the valve cover, and a sealing ring is arranged inside the sealing seat. The sealing ring is fitted onto the outer circumferential surface of the ventilation pipe to achieve dynamic sealing.

[0007] Preferably, the telescopic rod is fixedly connected to the top of the sealing cylinder, and a telescopic sleeve is provided on the outer side of the telescopic rod piston rod.

[0008] Preferably, a rib is fixedly connected to the outer side of the sealing cylinder.

[0009] Preferably, a guide cylinder is fixedly connected to the sealing seat, and the sealing ring is axially fixed within the sealing seat through the guide cylinder.

[0010] Preferably, a guide groove is provided on the inner side of the valve body, and the valve plate is slidably connected to the valve body through the guide groove.

[0011] Preferably, ventilation pipes are connected to both sides of the valve body, and one end of each ventilation pipe extends into the inside of the valve body.

[0012] Preferably, an inspection port is provided on one side of the sealing cylinder, and a sealing plate is fixedly connected to the inspection port.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a hot air valve stem sealing structure, which has the following beneficial effects: 1. The valve stem sealing structure of this hot air valve seals both ends of the valve stem and its connecting parts by setting a sealing cylinder and a sealing cavity respectively. At the same time, the sealing cylinder and the sealing cavity are separated by a sealing ring. Under their combined action, multiple sealing barriers are formed, which improves the sealing effect and extends the service life.

[0014] 2. The valve stem sealing structure of this hot air valve, by setting a guide groove to form a guiding fit with the valve plate, effectively limits the lateral displacement of the valve plate when under force, thereby avoiding the problem of uneven wear of the sealing ring on one side due to its displacement. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of the structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a cross-sectional schematic diagram of the sealing seat of this utility model.

[0016] In the diagram: 1. Telescopic rod; 2. Telescopic sleeve; 3. Inspection port; 4. Sealing cylinder; 5. Rib plate; 6. Valve cover; 7. Valve body; 8. Ventilation pipe; 9. Valve stem; 10. Sealing cavity; 11. Guide groove; 12. Valve plate; 13. Guide cylinder; 14. Sealing ring; 15. Sealing seat. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Please see Figure 1-3As shown, a hot air valve stem sealing structure includes a telescopic rod 1, a valve cover 6, a valve body 7, a valve stem 9, and a valve plate 12. The valve cover 6 is fixedly connected to the valve body 7 to form a sealing cavity 10. The valve plate 12 is disposed within the sealing cavity 10 and can reciprocate to achieve valve opening and closing. A sealing cylinder 4 is fixedly connected to the valve cover 6. One end of the valve stem 9 is fixedly connected to the valve plate 12, and the other end of the valve stem 9 passes through the valve cover 6 to the interior of the sealing cylinder 4 and is fixedly connected to the piston rod of the telescopic rod 1. The telescopic rod 1 is fixedly connected to the sealing cylinder 4. A sealing seat 15 is provided at the bottom end of the valve cover 6. A sealing ring 14 is arranged inside the sealing seat 15 and is fitted onto the outer circumferential surface of the ventilation pipe 8 to achieve dynamic sealing. Specifically, the telescopic rod 1 is a pneumatic cylinder or a hydraulic cylinder.

[0019] The hot air valve is powered by the telescopic rod 1, which drives the valve plate 12 to reciprocate within the sealing cavity 10, thereby opening and closing the valve. The sealing cavity 10 completely encloses the valve plate 12, and the sealing cylinder 4 completely encloses the valve stem 9 and the piston rod of the telescopic rod 1. Simultaneously, a sealing ring 14 is installed at the bottom of the sealing cylinder 4 to seal and separate the inner cavity of the sealing cylinder 4 from the sealing cavity 10, forming multiple sealing barriers. The sealing cavity 10 and the sealing ring 14 prevent media leakage from the movable connection between the valve stem 9 and the sealing cylinder 4. The sealing cylinder 4 prevents environmental dust from adhering to the valve stem 9 and the piston rod of the telescopic rod 1, thus ensuring its operation in a clean environment, reducing wear on the seals, and extending their service life. Even if the sealing ring 14 wears and fails, the media only enters the interior of the sealing cylinder 4, effectively preventing media leakage to the external environment.

[0020] Specifically, the telescopic rod 1 is fixedly connected to the top of the sealing cylinder 4, and a telescopic sleeve 2 is fitted over the outer side of the piston rod of the telescopic rod 1. One end of the telescopic sleeve 2 is fixed to the cylinder body of the telescopic rod 1, and the other end is fixed to the piston rod. By fitting the telescopic sleeve 2 over the outer side of the piston rod of the telescopic rod 1, the dustproof effect of the piston rod can be further improved.

[0021] To increase its structural strength, ribs 5 are fixedly connected to the outer side of the sealing cylinder 4. There are multiple ribs 5, which are arranged in an array around the circumference of the sealing cylinder 4. To facilitate the maintenance of the structural components inside the inspection port 3, an inspection port 3 is provided on one side of the sealing cylinder 4. The inspection port 3 is staggered with the ribs 5, and a sealing plate is fixedly connected to the inspection port 3.

[0022] In some embodiments, a guide cylinder 13 is fixedly connected to the sealing seat 15 by bolts. The guide cylinder 13 axially limits the sealing ring 14 in the sealing seat 15 to prevent the sealing ring 14 from moving with the valve stem 9. At the same time, the guide cylinder 13 can limit the valve stem 9 to prevent the valve stem 9 from shifting position.

[0023] In some embodiments, a guide groove 11 is provided on the inner side of the valve body 7, and the valve plate 12 is slidably connected to the valve body 7 through the guide groove 11. Ventilation pipes 8 are connected to both sides of the valve body 7, with one adjacent end of each ventilation pipe 8 penetrating to the inner side of the valve body 7. The ventilation pipe 8 located on the inner side of the valve body 7 extends to both sides of the guide groove 11. By providing the guide groove 11, the valve plate 12 can be limited and guided, preventing lateral displacement of the valve plate 12 under force, thereby avoiding the problem of uneven wear of the single-sided sealing ring 14 and guide cylinder 13 caused by its displacement, and also preventing jamming due to positional displacement. Preferably, the valve plate 12 has a V-shaped cross-section, and the guide groove 11 is a V-shaped groove.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hot air valve stem sealing structure, comprising a telescopic rod (1), a valve cover (6), a valve body (7), a valve stem (9), and a valve plate (12), characterized in that: The valve cover (6) is fixedly connected to the valve body (7) to form a sealing cavity (10), and the valve plate (12) is disposed in the sealing cavity (10) and can slide back and forth to realize the opening and closing of the valve; A sealing cylinder (4) is fixedly connected to the valve cover (6). One end of the valve stem (9) is fixedly connected to the valve plate (12). The other end of the valve stem (9) passes through the valve cover (6) to the inside of the sealing cylinder (4) and is fixedly connected to the piston rod of the telescopic rod (1). A sealing seat (15) is provided at the bottom of the valve cover (6). A sealing ring (14) is arranged inside the sealing seat (15). The sealing ring (14) is fitted on the outer circumferential surface of the ventilation pipe (8) to achieve dynamic sealing.

2. The hot air valve stem sealing structure according to claim 1, characterized in that: The telescopic rod (1) is fixedly connected to the top of the sealing cylinder (4), and the telescopic sleeve (2) is sleeved on the outside of the piston rod of the telescopic rod (1).

3. The hot air valve stem sealing structure according to claim 1, characterized in that: The outer side of the sealing cylinder (4) is fixedly connected with a rib plate (5).

4. The hot air valve stem sealing structure according to claim 1, characterized in that: A guide cylinder (13) is fixedly connected to the sealing seat (15), and the sealing ring (14) is axially fixed in the sealing seat (15) through the guide cylinder (13).

5. The hot air valve stem sealing structure according to claim 1, characterized in that: The valve body (7) has a guide groove (11) on its inner side, and the valve plate (12) is slidably connected to the valve body (7) through the guide groove (11).

6. The hot air valve stem sealing structure according to claim 1, characterized in that: Both sides of the valve body (7) are connected to ventilation pipes (8), and one end of the two adjacent ventilation pipes (8) extends into the inside of the valve body (7).

7. The hot air valve stem sealing structure according to claim 1, characterized in that: The sealing cylinder (4) has an inspection port (3) on one side, and a sealing plate is fixedly connected to the inspection port (3).

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