A labyrinth sealing device for zero leakage of RTO furnace lift valve

Abstract

The present invention relates to a labyrinth sealing device for a zero-leakage lift valve of an RTO furnace, comprising: a lift valve, an annular elastic raised sealing silicone pad, an annular steel plate and an RTO furnace pipe; the lift valve comprises a lift valve shaft, a main sealing valve plate A, an auxiliary valve plate B, a support sleeve, a limit switch box and a cylinder. The beneficial effects of the present invention are as follows: the present invention sets a raised sealing silicone pad on the lower end surface of the main sealing valve plate A and the outside of the RTO furnace pipe, and when the valve plate is closed, the upper and lower layers of raised sealing silicone pads bite each other to form a labyrinth seal, which blocks the flue gas and achieves a near-zero leakage effect; the present invention only uses silicone glue to fix the raised sealing silicone pad to the outside of the RTO pipe and the lower end surface of the valve plate, thereby achieving a zero-leakage effect for the RTO lift valve, with a simple structure and easy operation; the elastic silicone surface of the present invention can effectively reduce the friction between the valve plate and the pipe, and the silicone material is corrosion-resistant, which can effectively extend the service life of the lift valve.

Description

Technical Field

[0001] The invention relates to a sealing device, in particular to a zero-leakage labyrinth sealing device for an RTO furnace lift valve. Background Art

[0002] In recent years, the emission of volatile organic compounds (VOCs) has continued to increase, and their harmful effects on the environment and human health have received increasing attention. Therefore, controlling VOC emissions is imperative. Currently, the most widely used VOC control technology on the market is combustion, and the most widely used combustion method is regenerative thermal oxidizer (RTO). This technology heats organic waste gas to 800-850°C, oxidizing and decomposing the VOCs in the waste gas into carbon dioxide and water.

[0003] As a key piece of equipment in RTO technology, the sealing performance of the poppet valve directly impacts the quality of the entire RTO. Even minor exhaust gas leaks can significantly reduce exhaust gas treatment efficiency. Cover-plate poppet valves are a mainstream design for exhaust gas switching valves. Compared to other duct switching valves, cover-plate poppet valves offer advantages such as fast opening and closing and low leakage rates. However, in actual engineering applications, frequent use can easily cause wear, aging, and even deformation of the sealing plate, leading to increased leakage rates. Especially when the RTO furnace processes large amounts of exhaust gas, the diameter of the poppet valve plate increases. When the poppet valve opens and closes, the valve plate is impacted by the high-speed airflow, causing vibration. This can lead to slight deflection of the valve plate, which can cause exhaust gas leakage and affect RTO treatment efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a zero-leakage labyrinth sealing device for an RTO furnace lift valve.

[0005] This labyrinth sealing device for zero leakage of an RTO furnace lift valve comprises a lift valve, an annular elastic raised sealing silicone pad, an annular steel plate and an RTO furnace pipe; the lift valve comprises a lift valve shaft, a main sealing valve plate A, an auxiliary valve plate B, a support sleeve, a limit switch box and a cylinder; the main sealing valve plate A and the auxiliary valve plate B are provided at the upper end of the lift valve shaft, and a circle of annular elastic raised sealing silicone pad is provided on the lower end face of the main sealing valve plate A; an annular steel plate is welded to the outside of the top end of the RTO furnace pipe, and two circles of annular elastic raised sealing silicone pads are provided on the annular steel plate; the annular elastic raised sealing silicone pad on the lower end face of the main sealing valve plate A and the two circles of annular elastic raised sealing silicone pads on the outside of the RTO furnace pipe engage with each other to form a labyrinth sealing structure.

[0006] As a preferred embodiment: a limit switch box is provided above the cylinder, a support sleeve is provided above the limit switch box, the support sleeve fixes and supports the lift valve shaft, and the main sealing valve plate A and the auxiliary valve plate B are fixed to the upper end of the lift valve shaft.

[0007] Preferably, the distance between the two annular elastic raised sealing silicone pads on the outside of the RTO furnace pipe is at least 10 cm, and the horizontal distance between the annular elastic raised sealing silicone pad and the edge of the main sealing valve plate A is at least 2 cm.

[0008] As a preferred embodiment, the annular elastic raised sealing silicone pad on the lower end surface of the main sealing valve plate A is placed in the middle of the two circles of annular elastic raised sealing silicone pads on the outside of the RTO furnace pipe.

[0009] As a preference, the height of the annular elastic raised sealing silicone pad on the lower end surface of the main sealing valve plate A is smaller than the height of the annular elastic raised sealing silicone pad on the outside of the RTO furnace pipe.

[0010] As a preferred embodiment, the annular elastic raised sealing silicone pad is fixed to the lower end surface of the main sealing valve plate A and the annular steel plate of the RTO furnace pipe by silicone glue.

[0011] As a preference, the annular elastic raised sealing silicone pad is made of high-temperature resistant silicone.

[0012] The beneficial effects of the present invention are:

[0013] 1) The present invention provides a raised sealing silicone pad on the lower end surface of the main sealing valve plate A and the outside of the RTO furnace pipe. When the valve plate is closed, the upper and lower layers of raised sealing silicone pads engage with each other to form a labyrinth seal, which blocks the flue gas and achieves a near zero leakage effect.

[0014] 2) The present invention only uses silicone glue to fix the raised sealing silicone pad to the outside of the RTO pipe and the lower end surface of the valve plate, thereby achieving a zero leakage effect of the RTO lifting valve, with a simple structure and easy operation.

[0015] 3) The elastic silicone surface of the present invention can effectively reduce the friction between the valve plate and the connecting pipe, and the silicone material is corrosion-resistant, which can effectively extend the service life of the poppet valve.

[0016] 4) The raised sealing silicone pad of the present invention is fixed with glue, and the sealing device can be easily replaced when the equipment is shut down for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of an existing lift valve in a closed state;

[0018] Figure 2 This is a schematic diagram of the poppet valve of the present invention in an open state;

[0019] Figure 3Detailed schematic diagram of the labyrinth seal of the present invention.

[0020] Explanation of the reference numerals: lifting valve shaft 1, main sealing valve plate A2, auxiliary valve plate B3, supporting sleeve 4, limit switch box 5, cylinder 6, annular elastic raised sealing silicone pad 7, annular steel plate 8, silicone glue 9, RTO furnace pipe 10. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, a number of improvements and modifications may be made to the present invention by those skilled in the art, and such improvements and modifications fall within the scope of the claims of the present invention.

[0022] In the RTO exhaust gas treatment system, a cover-type lift valve is required to ensure smooth switching of each heat storage chamber. Figure 1 As shown, the cover-plate poppet valve primarily comprises a poppet shaft 1, a main sealing valve plate A2, an auxiliary valve plate B3, a support sleeve 4, a limit switch box 5, and a cylinder 6. The limit switch box 5 is located above the cylinder 6, and above this, a support sleeve 4 is located. The support sleeve 4 secures and supports the poppet shaft 1, which is topped by the main sealing valve plate A2 and the auxiliary valve plate B3. The cylinder 6 provides power for the poppet valve, pushing the poppet shaft 1 up and down, opening or closing the main sealing valve plate A2 and the auxiliary valve plate B3. The limit switch box 5 facilitates the installation of the limit switch and detects whether the poppet valve is open or closed in the RTO exhaust gas treatment system's PLC. The support sleeve 4 secures the poppet shaft 1 and provides a sealing device to prevent exhaust gas leakage from the pipeline.

[0023] The labyrinth seal device for zero leakage of the RTO furnace lift valve of this embodiment (such as Figure 2 、 3As shown), it is mainly used as a sealing device between the valve sealing cover plate and the RTO furnace pipe. The main sealing valve plate A2 and the auxiliary valve plate B3 are fixed to the upper end of the lifting valve shaft 1, and the lower end face of the main sealing valve plate A2 of the lifting valve is provided with a circle of annular elastic raised sealing silicone gasket 7, and the annular elastic raised sealing silicone gasket 7 is fixed to the lower end face of the main sealing valve plate A2 by silicone glue 9; an annular steel plate 8 is welded to the outside of the top of the RTO furnace pipe 10, and two circles of annular elastic raised sealing silicone gaskets 7 are provided on the annular steel plate 8, and the annular elastic raised sealing silicone gasket 7 is fixed to the annular steel plate 8 by high-temperature resistant silicone glue 9; the two circles of annular elastic raised sealing silicone gaskets 7 on the outside of the RTO furnace pipe 10 are at least 10 cm apart, and the horizontal distance between the annular elastic raised sealing silicone gasket 7 and the edge of the main sealing valve plate A2 is at least 2 cm, and the annular elastic raised sealing silicone gasket 7 on the lower end face of the main sealing valve plate A2 is placed in the middle of the two circles of annular elastic raised sealing silicone gaskets 7 on the outside of the RTO furnace pipe 10 (as shown Figure 3 As shown), this spacing requirement can ensure that the sealing effect of the valve plate can still be achieved when the lifting valve shaft is offset. The height of the annular elastic raised sealing silicone pad 7 on the lower end face of the main sealing valve plate A2 should be 0.5cm less than the height of the annular elastic raised sealing silicone pad 7 on the outside of the RTO furnace pipe 10. This height difference requirement is to ensure that the sealing is mainly achieved by the annular elastic raised sealing silicone pad 7 on the outside of the RTO furnace pipe 10. The annular elastic raised sealing silicone pad 7 on the lower end face of the main sealing valve plate A2 assists the sealing form to become a labyrinth seal, and will not become the main sealing gasket due to installation errors or long-term deformation after use. The material used for the raised sealing silicone pad is high-temperature resistant (≥300℃) silicone. The cylinder 6 of the poppet valve pushes the poppet valve shaft 1 to move up and down, and the valve plate moves with the shaft. When the valve is closed, the annular elastic raised sealing silicone pad 7 on the lower end face of the main sealing valve plate A2 and the two circles of annular elastic raised sealing silicone pads 7 on the outside of the RTO furnace pipe 10 bite each other to form a labyrinth seal.

[0024] The present invention makes full use of the corrosion resistance and elasticity of the high-temperature resistant silicone pad to effectively reduce the friction between the valve plate and the connecting pipe. An elastic raised sealing silicone pad is arranged on the lower end surface of the main sealing valve plate A2 and the outside of the RTO furnace connecting pipe 10. When the lifting valve shaft deviates due to long-term use or excessive flue gas volume, the upper and lower raised sealing silicone pads engage with each other to form a labyrinth seal to block the flue gas, thereby achieving an effect close to zero leakage.

Claims

1. A zero-leakage labyrinth seal device for an RTO furnace lift valve, characterized by: The invention comprises a lifting valve, an annular elastic raised sealing silicone pad (7), an annular steel plate (8) and an RTO furnace pipe (10); the lifting valve comprises a lifting valve shaft (1), a main sealing valve plate A (2), an auxiliary valve plate B (3), a supporting sleeve (4), a limit switch box (5) and a cylinder (6); the upper end of the lifting valve shaft (1) is provided with a main sealing valve plate A (2) and an auxiliary valve plate B (3), and the lower end surface of the main sealing valve plate A (2) is provided with a circle of annular elastic raised sealing silicone pad (7); an annular steel plate (8) is welded to the outside of the top end of the RTO furnace pipe (10), and the annular steel plate (8) is provided with two circles of annular elastic raised sealing silicone pads. The annular elastic raised sealing silicone pad (7) on the lower end surface of the main sealing valve plate A (2) and the two circles of annular elastic raised sealing silicone pads (7) on the outside of the RTO furnace pipe (10) engage with each other to form a labyrinth sealing structure; the annular elastic raised sealing silicone pad (7) on the lower end surface of the main sealing valve plate A (2) is placed in the middle of the two circles of annular elastic raised sealing silicone pads (7) on the outside of the RTO furnace pipe (10); the height of the annular elastic raised sealing silicone pad (7) on the lower end surface of the main sealing valve plate A (2) is less than the height of the annular elastic raised sealing silicone pad (7) on the outside of the RTO furnace pipe (10).

2. The zero-leakage labyrinth seal device for an RTO furnace lift valve according to claim 1, characterized in that: A limit switch box (5) is provided above the cylinder (6), a support sleeve (4) is provided above the limit switch box (5), the support sleeve (4) fixes and supports the lift valve shaft (1), and a main sealing valve plate A (2) and an auxiliary valve plate B (3) are fixed to the upper end of the lift valve shaft (1).

3. The zero-leakage labyrinth seal device for an RTO furnace lift valve according to claim 1, characterized in that: The distance between the two ring-shaped elastic raised sealing silicone pads (7) outside the RTO furnace pipe (10) is at least 10 cm, and the horizontal distance between the ring-shaped elastic raised sealing silicone pads (7) and the edge of the main sealing valve plate A (2) is at least 2 cm.

4. The zero-leakage labyrinth seal device for an RTO furnace lift valve according to claim 1, characterized in that: The annular elastic raised sealing silicone pad (7) is fixed to the lower end surface of the main sealing valve plate A (2) and the annular steel plate (8) of the RTO furnace pipe (10) respectively through silicone glue (9).

5. The zero-leakage labyrinth seal device for an RTO furnace lift valve according to claim 1, characterized in that: The material of the annular elastic raised sealing silicone pad (7) is high-temperature resistant silicone.

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