A heating furnace reversing valve sealing structure

Abstract

The utility model discloses a kind of heating furnace reversing valve sealing structure, belong to steel rolling production technical field, including reversing valve main body, reversing valve cavity bottom of reversing valve main body is provided with disc, disc upper portion is provided with upper valve plate, upper valve plate lower surface is provided with upper valve plate sealing ring, disc is hollow structure, bottom sealing ring is provided on disc, disc includes integrally connected outer ring and inner ring, the height of inner ring is greater than the height of outer ring, bottom sealing ring outside and inner ring inside contact, bottom sealing ring lower surface and outer ring upper surface contact, annular cover for being used to the compression of bottom sealing ring is set on outer ring, on vertical direction projection, bottom sealing ring is located in upper valve plate sealing ring inside.The utility model can avoid the problem that sealing failure is caused by the seal ring drop-off on valve plate, guarantee reversing valve sealing effect.

Description

Technical Field

[0001] This utility model relates to a sealing structure for a reversing valve of a heating furnace, belonging to the field of steel rolling production technology. Background Technology

[0002] The key reason why the actual gas loss during the reversing process of a dual regenerative heater is much higher than the theoretical calculation is the internal leakage of the reversing valve, which causes gas leakage between the gas chamber and the flue gas chamber, creating a short circuit. Currently, the mainstream sealing method is to install the sealing ring on the valve plate of the reversing valve. However, the high-frequency movement of the valve plate and the front-side blowing of flue gas can easily cause the sealing ring to fall off or burn out, resulting in sealing failure. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a sealing structure for the reversing valve of a heating furnace, which can avoid the sealing failure caused by the sealing ring falling off the valve plate and ensure the sealing effect of the reversing valve.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A sealing structure for a reversing valve of a heating furnace includes a reversing valve body. A disc is disposed at the bottom of the reversing valve cavity of the reversing valve body. An upper valve plate is disposed above the disc. An upper valve plate sealing ring is disposed below the upper valve plate. The disc is a hollow structure. A bottom sealing ring is disposed on the disc. The disc includes an outer ring and an inner ring integrally connected. The height of the inner ring is greater than the height of the outer ring. The outer side of the bottom sealing ring contacts the inner side of the inner ring, and the bottom of the bottom sealing ring contacts the top of the outer ring. An annular cover for pressing the bottom sealing ring is disposed on the outer ring. In the vertical projection, the bottom sealing ring is located inside the upper valve plate sealing ring.

[0006] The bottom sealing ring has a size of DN400.

[0007] The upper valve plate sealing ring has a size of DN450.

[0008] The disc and the reversing valve cavity are connected by welding.

[0009] The disc is made of carbon steel.

[0010] The upper valve plate sealing ring and the bottom sealing ring are made of fluororubber.

[0011] The annular cover and the outer ring are connected by bolts.

[0012] The height of the inner ring is 20mm, and the height of the outer ring is 10mm.

[0013] The beneficial effects of this utility model are as follows: The sealing structure of the reversing valve of the heating furnace provided by this utility model adds a bottom sealing ring to the lower part of the valve disc of the reversing valve on the basis of the original sealing, forming a double seal with the sealing ring on the upper part of the valve disc. The lower seal is fixed with an annular cover to ensure that the sealing ring does not deform or fall off, and at the same time avoids the erosion of flue gas, thus improving the service life of the sealing ring. After adopting a double seal, the sealing failure caused by the sealing ring falling off the valve plate can be avoided, and the sealing reliability is greatly improved. It can also prevent the upper valve plate sealing ring from falling off due to frequent operation, which would cause poor sealing and lead to the phenomenon of gas leakage, thereby reducing gas loss and CO emissions. It solves the problem of gas waste caused by the inability to stop the machine for treatment due to the damage of the sealing ring during the production process. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a reversing valve sealing structure for a heating furnace according to the present invention;

[0015] Figure 2 yes Figure 1 A magnified structural diagram of position A in the middle;

[0016] The attached diagram is labeled as follows: 1-Disc; 2-Annular cover; 3-Upper valve plate sealing ring; 4-Bottom sealing ring; 5-Upper valve plate; 11-Outer ring; 12-Inner ring. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the protection scope of the present invention.

[0018] Example 1

[0019] like Figure 1 and Figure 2 As shown, this utility model discloses a sealing structure for a reversing valve of a heating furnace, including a reversing valve body. A disc 1 is provided at the bottom of the reversing valve cavity of the reversing valve body, an upper valve plate 5 is provided above the disc 1, and an upper valve plate sealing ring 3 is provided below the upper valve plate 5. The disc 1 is a hollow structure for gas passage. A bottom sealing ring 4 is provided on the disc 1. Specifically, the disc 1 includes an integrally connected outer ring 11 and inner ring 12. The height of the inner ring 12 is greater than the height of the outer ring 11. The outer side of the bottom sealing ring 4 contacts the inner side of the inner ring 12, and the bottom of the bottom sealing ring 4 contacts the top of the outer ring 11. An annular cover 2 is provided on the outer ring 11 for pressing the bottom sealing ring 4. In the vertical projection, the bottom sealing ring 4 is located inside the upper valve plate sealing ring 3, so that the upper and lower sealing rings are staggered. In addition, the upper valve plate sealing ring 3 and the bottom sealing ring 4 are at the same height to ensure that both seals are effective.

[0020] The working principle of this utility model is as follows: the upper valve plate 5 moves downward, the upper valve plate sealing ring 3 contacts the annular cover 2 to achieve the first seal, and the bottom sealing ring 4 contacts the upper valve plate 5 to achieve the second seal. The sealing effect is guaranteed by the two seals.

[0021] This utility model employs two seals, which can prevent the sealing ring on the valve plate from falling off and causing sealing failure. The sealing reliability is greatly improved, and the sealing ring on the upper valve plate can be prevented from falling off due to frequent operation, resulting in poor sealing and gas leakage.

[0022] Example 2

[0023] like Figure 1 and Figure 2 As shown, this utility model discloses a sealing structure for a reversing valve of a heating furnace, including a reversing valve body. A disc 1 is provided at the bottom of the reversing valve cavity of the reversing valve body. The disc 1 is made of carbon steel and is welded to the reversing valve cavity. An upper valve plate 5 is provided above the disc 1, and an upper valve plate sealing ring 3 is provided below the upper valve plate 5. The disc 1 has a hollow structure for gas passage. A bottom sealing ring 4 is provided on the disc 1. Specifically, the disc 1 includes an outer ring 11 and an inner ring 12 integrally connected. The height of the inner ring 12 is greater than the height of the outer ring 11. Specifically, the height of the inner ring 12 is 20mm, and the height of the outer ring 11 is 10mm. The upper valve plate sealing ring 3 and the bottom sealing ring 4 are made of fluororubber.

[0024] The outer side of the bottom sealing ring 4 contacts the inner side of the inner ring 12, and the lower part of the bottom sealing ring 4 contacts the upper part of the outer ring 11. An annular cover 2 is provided on the outer ring 11 to press the bottom sealing ring 4. The annular cover 2 is connected to the outer ring 11 by M12 bolts to fix the sealing ring, facilitating removal and replacement during maintenance. In vertical projection, the bottom sealing ring 4 is located inside the upper valve plate sealing ring 3, resulting in an alternating arrangement of the upper and lower sealing rings. Specifically, the bottom sealing ring 4 has a size of DN400, and the upper valve plate sealing ring 3 has a size of DN450. Furthermore, the upper valve plate sealing ring 3 and the bottom sealing ring 4 are at the same height, ensuring that both seals are effective.

[0025] The above are merely preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A sealing structure for a reversing valve of a heating furnace, characterized in that: The device includes a reversing valve body, a disc (1) at the bottom of the reversing valve cavity of the reversing valve body, an upper valve plate (5) above the disc (1), an upper valve plate sealing ring (3) below the upper valve plate (5), the disc (1) is a hollow structure, a bottom sealing ring (4) is provided on the disc (1), the disc (1) includes an outer ring (11) and an inner ring (12) integrally connected, the height of the inner ring (12) is greater than the height of the outer ring (11), the outer side of the bottom sealing ring (4) contacts the inner side of the inner ring (12), the bottom of the bottom sealing ring (4) contacts the top of the outer ring (11), and an annular cover (2) for pressing the bottom sealing ring (4) is provided on the outer ring (11). In the vertical projection, the bottom sealing ring (4) is located inside the upper valve plate sealing ring (3).

2. The sealing structure of the reversing valve of the heating furnace according to claim 1, characterized in that: The bottom sealing ring (4) has a size of DN400.

3. The sealing structure of the reversing valve of the heating furnace according to claim 1, characterized in that: The upper valve plate sealing ring (3) has a size of DN450.

4. The sealing structure of the reversing valve of the heating furnace according to claim 1, characterized in that: The disc (1) and the reversing valve cavity are connected by welding.

5. The sealing structure of the reversing valve of the heating furnace according to claim 1, characterized in that: The disc (1) is made of carbon steel.

6. The sealing structure of the reversing valve of the heating furnace according to claim 1, characterized in that: The upper valve plate sealing ring (3) and the bottom sealing ring (4) are made of fluororubber.

7. The sealing structure of the reversing valve of the heating furnace according to claim 1, characterized in that: The annular cover (2) and the outer ring (11) are connected by bolts.

8. The sealing structure of the reversing valve of the heating furnace according to claim 1, characterized in that: The height of the inner ring (12) is 20 mm, and the height of the outer ring (11) is 10 mm.

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