Hot air valve sealing structure

Abstract

The utility model discloses a hot -blast valve sealing structure belongs to hot -blast valve technical field, specifically including valve body, be provided with fluid passage in the valve body, the fluid passage is slidably connected with the valve plate in, both sides of the fluid passage in the valve plate are provided with valve seat, both sides of the valve plate are provided with annular groove, be provided with sealing ring assembly in the annular groove, still include floating pressurizing mechanism, the floating pressurizing mechanism includes high pressure chamber and pressure injection channel, the high pressure chamber sets up in the valve plate and is linked with annular groove, the high pressure chamber is slidably connected with pressure compensation board in, the pressure injection channel fixedly connected on the valve plate and is linked with high pressure chamber, the utility model discloses can provide independent external pressure to sealing ring assembly, and this pressure is continuously acting on sealing ring assembly through pressure compensation board, can automatically compensate the sealing gap change caused by thermal deformation, mechanical wear or vibration, always keep the best sealing specific pressure, realize zero leakage.

Description

Technical Field

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

[0002] Hot air valves are key shut-off devices in hot air duct systems in industries such as metallurgy, power, and building materials. Their working environment is usually high temperature, high pressure, and the medium contains dust.

[0003] Traditional hot air valves experience thermal deformation of the valve plate and seat at high temperatures. The initial sealing preload may be insufficient, leading to leakage, or excessive, causing premature wear of the seals. After long-term use, the seals will wear down, resulting in an increased sealing gap that cannot be automatically compensated for, thus losing its sealing effect. Therefore, a hot air valve sealing structure is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a hot air valve sealing structure that features reliable sealing performance and automatic wear compensation.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hot air valve sealing structure. This utility model, through a floating pressurization mechanism, can provide independent external pressure to the sealing ring assembly. This pressure is continuously applied to the sealing ring assembly through a pressure compensation plate, which can automatically compensate for changes in the sealing gap caused by thermal deformation, mechanical wear, or vibration, and always maintain the optimal sealing specific pressure to achieve zero leakage.

[0006] Preferably, the pressure injection channel is located inside the valve stem of the valve plate or valve body, one end of the pressure injection channel is connected to the high-pressure chamber, and the other end of the pressure injection channel is connected to an external pressure source.

[0007] Preferably, the sealing ring assembly includes a flexible graphite ring and a metal retaining ring, wherein the flexible graphite ring is disposed on the inner side of the annular groove, and the metal retaining ring is fixedly connected to the outer side of the flexible graphite ring.

[0008] Preferably, the outer diameter of the sealing ring assembly is larger than the outer diameter of the valve plate body and smaller than the inner diameter of the valve seat.

[0009] Preferably, the surface of the metal retaining ring is provided with an ultra-hard ceramic coating.

[0010] Preferably, the sealing surface of the valve seat is provided with a hard alloy layer.

[0011] Preferably, the pressure compensation plate has an annular structure, and the pressure compensation plate is slidably connected to the inner wall of the high-pressure chamber through a dynamic seal.

[0012] Preferably, the dynamic seal is a flexible graphite packing ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This invention provides an independent external pressure to the sealing ring assembly through a floating pressurization mechanism. This pressure is continuously applied to the sealing ring assembly through a pressure compensation plate, which can automatically compensate for changes in the sealing gap caused by thermal deformation, mechanical wear, or vibration, and always maintain the optimal sealing pressure to achieve zero leakage. Attached Figure Description

[0014] 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: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic cross-sectional view of the present invention. Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle; In the diagram: 1. Valve body; 2. Fluid passage; 3. Valve plate; 4. Valve seat; 5. Annular groove; 6. Sealing ring assembly; 7. High-pressure chamber; 8. Pressure compensation plate; 9. Pressure injection channel; 10. Dynamic seal. Detailed Implementation

[0015] 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.

[0016] Example Please see Figure 1-3 This embodiment provides the following technical solution: a hot air valve sealing structure, including a valve body 1, a fluid channel 2 provided inside the valve body 1, a valve plate 3 slidably connected inside the fluid channel 2, valve seats 4 provided on both sides of the valve plate 3 inside the fluid channel 2, annular grooves 5 provided on both the left and right sides of the valve plate 3, and sealing ring assemblies 6 provided in the annular grooves 5. In some embodiments, the valve plate 3 can slide vertically in the fluid channel 2 through the valve stem inside the valve body 1 and the actuator connected to the top of the valve stem, thereby realizing the opening and closing of the valve.

[0017] The sealing ring assembly 6 includes a flexible graphite ring and a metal retainer. The flexible graphite ring is located inside the annular groove 5, and the metal retainer is fixedly connected to the outside of the flexible graphite ring. The flexible graphite ring is located inside and directly contacts the annular groove 5 of the valve plate 3. Its excellent flexibility ensures that it can fill the micro-gaps well under pressure. The metal retainer covers the outside of the flexible graphite ring, providing it with structural support and preventing it from being blown out by the high-pressure medium or deformed by excessive compression.

[0018] In some embodiments, to enhance the wear resistance of the metal retaining ring, an ultra-hard ceramic coating is sprayed onto the surface of the metal retaining ring. At the same time, the sealing surface of the valve seat 4 is also overlaid or inlaid with a hard alloy layer, which together with the metal retaining ring with ceramic coating forms an ultra-wear-resistant sealing pair.

[0019] The outer diameter of the sealing ring assembly 6 is larger than the outer diameter of the valve plate 3 body and smaller than the inner diameter of the valve seat 4. This ensures that during the valve closing process, the sealing ring assembly 6 can contact the valve seat 4 before the metal body of the valve plate 3, forming an effective pre-seal, avoiding hard contact between metals, and ensuring smooth alignment.

[0020] It also includes a floating pressurization mechanism, which includes a high-pressure chamber 7 and a pressure injection channel 9. The high-pressure chamber 7 is located inside the valve plate 3 and communicates with the annular groove 5. A pressure compensation plate 8 is slidably connected inside the high-pressure chamber 7. The pressure injection channel 9 is fixedly connected to the valve plate 3 and communicates with the high-pressure chamber 7. Through the floating pressurization mechanism, an independent external pressure can be provided to the sealing ring assembly 6. This pressure is continuously applied to the sealing ring assembly 6 through the pressure compensation plate 8, which can automatically compensate for changes in the sealing gap caused by thermal deformation, mechanical wear or vibration, and always maintain the optimal sealing specific pressure to achieve zero leakage.

[0021] The pressure injection channel 9 is located inside the valve stem within the valve plate 3 or valve body 1. One end of the pressure injection channel 9 is connected to the high-pressure chamber 7, and the other end of the pressure injection channel 9 is connected to an external pressure source. In some embodiments, the external pressure source can be a hydraulic station or a pneumatic pump, providing a stable and adjustable pressure medium.

[0022] The pressure compensation plate 8 has a ring structure. The pressure compensation plate 8 is slidably connected to the inner wall of the high pressure chamber 7 through the dynamic seal 10, which increases the sealing performance between the pressure compensation plate 8 and the inner wall of the high pressure chamber 7 during the movement of the pressure compensation plate 8.

[0023] The dynamic seal 10 is a flexible graphite packing ring.

[0024] The working principle of this utility model is as follows: When it is necessary to close the valve, the actuator drives the valve stem and valve plate 3 to move downward until the sealing ring assembly 6 contacts the valve seat 4. At this time, the external pressure source is activated, and the pressure medium enters the high-pressure chamber 7 through the pressure injection channel 9, pushing the pressure compensation plate 8 to move towards the sealing ring assembly 6. The pressure compensation plate 8 evenly transmits the pressure to the flexible graphite ring and the metal retaining ring, so that they are tightly attached to the hard alloy layer of the valve seat 4, forming an initial strong seal. During valve use, if the sealing gap increases due to thermal deformation, or if the sealing surface develops a gap due to wear, the pressure in the high-pressure chamber 7 will continue to push the pressure compensation plate 8 to move, compensating for the increased gap, so that the sealing ring assembly 6 always presses tightly against the valve seat 4, maintaining a constant sealing force.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is 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 hot air valve sealing structure, characterized in that: Includes a valve body (1), a fluid channel (2) is provided inside the valve body (1), a valve plate (3) is slidably connected inside the fluid channel (2), valve seats (4) are provided on both sides of the valve plate (3) inside the fluid channel (2), annular grooves (5) are provided on both sides of the valve plate (3), and a sealing ring assembly (6) is provided inside the annular grooves (5). It also includes a floating pressurization mechanism, which includes a high-pressure chamber (7) and a pressure injection channel (9). The high-pressure chamber (7) is located in the valve plate (3) and communicates with the annular groove (5). A pressure compensation plate (8) is slidably connected in the high-pressure chamber (7). The pressure injection channel (9) is fixedly connected to the valve plate (3) and communicates with the high-pressure chamber (7).

2. The hot air valve sealing structure according to claim 1, characterized in that: The pressure injection channel (9) is located inside the valve stem in the valve plate (3) or valve body (1). One end of the pressure injection channel (9) is connected to the high pressure chamber (7), and the other end of the pressure injection channel (9) is connected to an external pressure source.

3. The hot air valve sealing structure according to claim 1, characterized in that: The sealing ring assembly (6) includes a flexible graphite ring and a metal retainer ring. The flexible graphite ring is disposed inside the annular groove (5), and the metal retainer ring is fixedly connected to the outside of the flexible graphite ring.

4. The hot air valve sealing structure according to claim 3, characterized in that: The outer diameter of the sealing ring assembly (6) is greater than the outer diameter of the valve plate (3) and smaller than the inner diameter of the valve seat (4).

5. The hot air valve sealing structure according to claim 3, characterized in that: The surface of the metal retaining ring is coated with an ultra-hard ceramic coating.

6. The hot air valve sealing structure according to claim 1, characterized in that: The sealing surface of the valve seat (4) is provided with a hard alloy layer.

7. The hot air valve sealing structure according to claim 1, characterized in that: The pressure compensation plate (8) is an annular structure, and the pressure compensation plate (8) is slidably connected to the inner wall of the high pressure chamber (7) through a dynamic seal (10).

8. A hot air valve sealing structure according to claim 7, characterized in that: The dynamic seal (10) is a flexible graphite packing ring.

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