CN211501652U

CN211501652U - Labyrinth sealing device for zero leakage of lift valve of RTO furnace

Info

Publication number: CN211501652U
Application number: CN201922235729.8U
Authority: CN
Inventors: 邓丽萍; 戴豪波; 陈瑶姬; 姜雅洲; 孙浩; 刘文榉; 唐一凡; 方华
Original assignee: Zhejiang Tiandi Environmental Protection Technology Co Ltd
Current assignee: Zhejiang Tiandi Environmental Protection Technology Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-09-15
Anticipated expiration: 2029-12-13

Abstract

The utility model relates to a labyrinth sealing device that is used for RTO stove poppet valve zero to leak, include: the lifting valve, the annular elastic bulge sealing silica gel pad, the annular steel plate and the RTO furnace connecting pipe are arranged on the lifting valve; the lift valve comprises a lift valve shaft, a main sealing valve plate A, an auxiliary valve plate B, a supporting sleeve, a limit switch box and a cylinder. The utility model has the advantages that: the utility model arranges the convex sealing silica gel pads on the lower end surface of the main sealing valve plate A and the outside of the RTO furnace connecting pipe, when the valve plate is closed, the upper convex sealing silica gel pad and the lower convex sealing silica gel pad are mutually occluded to form labyrinth seal, and the seal is utilized to block the flue gas, thereby achieving the effect of approaching zero leakage; the utility model only utilizes silica gel glue to fix the convex sealing silica gel pad on the outer part of the RTO connecting pipe and the lower end surface of the valve plate, thereby realizing the zero leakage effect of the RTO poppet valve, and having simple structure and convenient operation; the utility model discloses an elasticity silica gel face can effectual reduction valve plate and take over between the friction, and the silica gel material is corrosion-resistant, can prolong the life of poppet valve effectively.

Description

Labyrinth sealing device for zero leakage of lift valve of RTO furnace

Technical Field

The utility model relates to a sealing device, concretely relates to labyrinth sealing device that is used for RTO stove poppet valve zero leakage.

Background

In recent years, the emission of Volatile Organic Compounds (VOCs) has been increasing, and the harm to the environment and human body has been more and more concerned, so that it is imperative to control the emission of VOCs. At present, the most adopted VOCs treatment technology in the market is a combustion method, and the combustion method is mostly applied with a Regenerative Thermal Oxidizer (RTO) technology, and the principle is that organic waste gas is heated to 800-850 ℃ so that VOCs in the waste gas are oxidized and decomposed into carbon dioxide and water.

The lift valve is one of important devices in the RTO technology, the quality of the whole RTO is directly influenced by the quality of the sealing performance of the lift valve, and the treatment efficiency of waste gas is greatly reduced due to small waste gas leakage. The cover plate type poppet valve is a mainstream design of the waste gas switching valve, and compared with other air pipe switching valves, the cover plate type poppet valve has the advantages of being fast in opening and closing action, low in leakage rate and the like. However, in practical engineering application, the sealing plate is easy to wear, age and even deform due to frequent use, so that the leakage rate is increased. Particularly, when the RTO furnace is large in waste gas treatment amount, the diameter of a valve plate of a lift valve is increased, and the valve plate is impacted by high-speed airflow to generate vibration when the lift valve is opened/closed, so that the valve plate slightly deflects, waste gas leakage is caused, and the RTO treatment efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough among the prior art, provide a labyrinth sealing device that is used for RTO stove poppet valve zero leakage.

The labyrinth sealing device for zero leakage of the lift valve of the RTO furnace comprises the lift valve, an annular elastic bulge sealing silica gel pad, an annular steel plate and an RTO furnace connecting pipe; the lifting valve comprises a lifting valve shaft, a main sealing valve plate A, an auxiliary valve plate B, a supporting sleeve, a limit switch box and a cylinder; the upper end of the lifting valve shaft is provided with a main sealing valve plate A and an auxiliary valve plate B, and the lower end surface of the main sealing valve plate A is provided with a circle of annular elastic bulge sealing silica gel pad; an annular steel plate is welded outside the top end of the RTO furnace connecting pipe, and two rings of annular elastic bulge sealing silica gel pads are arranged on the annular steel plate; the annular elastic bulge sealing silica gel pad on the lower end face of the main sealing valve plate A and the two rings of annular elastic bulge sealing silica gel pads outside the RTO furnace connecting pipe are mutually occluded to form a labyrinth sealing structure.

Preferably, the method comprises the following steps: a limit switch box is arranged above the air cylinder, a supporting sleeve is arranged above the limit switch box, the supporting sleeve fixes and supports the lifting valve shaft, and a main sealing valve plate A and an auxiliary valve plate B are fixed at the upper end of the lifting valve shaft.

Preferably, the method comprises the following steps: the distance between two rings of annular elastic bulge sealing silica gel pads outside the RTO furnace connecting pipe is at least 10cm, and the horizontal distance between the annular elastic bulge sealing silica gel pads and the edge of the main sealing valve plate A is at least 2 cm.

Preferably, the method comprises the following steps: the annular elastic bulge sealing silica gel pad on the lower end face of the main sealing valve plate A is placed in the middle of the two rings of annular elastic bulge sealing silica gel pads outside the RTO furnace connecting pipe.

Preferably, the method comprises the following steps: the height of the annular elastic bulge sealing silica gel pad on the lower end face of the main sealing valve plate A is smaller than that of the annular elastic bulge sealing silica gel pad outside the RTO furnace connecting pipe.

Preferably, the method comprises the following steps: the annular elastic bulge sealing silica gel pad is respectively fixed on the lower end face of the main sealing valve plate A and the annular steel plate of the RTO furnace connecting pipe through silica gel glue.

Preferably, the method comprises the following steps: the annular elastic bulge sealing silica gel pad is made of high-temperature-resistant silica gel.

The utility model has the advantages that:

1) the utility model discloses terminal surface and RTO stove are taken over the outside and are set up protruding sealing silica gel pad under main sealing valve plate A, and upper and lower two-layer protruding sealing silica gel pad interlock each other forms labyrinth seal when the valve plate is closed, utilizes this kind to seal and blocks the flue gas, reaches and is close to zero and leaks the effect.

2) The utility model discloses only utilize silica gel glue to be fixed in terminal surface under the RTO takeover outside and the valve plate with protruding sealing silica gel pad, realize the zero leakage effect of RTO poppet valve, simple structure.

3) The utility model discloses an elasticity silica gel face can effectual reduction valve plate and take over between the friction, and the silica gel material is corrosion-resistant, can prolong the life of poppet valve effectively.

4) The utility model discloses a protruding sealing silica gel pad adopts glue fixed, when equipment shut down and overhaul, can conveniently change this sealing device.

Drawings

FIG. 1 is a schematic diagram of a closed state of a conventional poppet valve;

fig. 2 is a schematic view of the open state of the poppet valve of the present invention;

fig. 3 is a detailed schematic view of the labyrinth seal of the present invention.

Description of reference numerals: the lifting valve comprises a lifting valve shaft 1, a main sealing valve plate A2, an auxiliary valve plate B3, a supporting sleeve 4, a limit switch box 5, a cylinder 6, an annular elastic bulge sealing silica gel pad 7, an annular steel plate 8, silica gel glue 9 and an RTO furnace connecting pipe 10.

Detailed Description

The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

In an RTO exhaust treatment system, a poppet valve of the cover plate type is required to ensure smooth switching of each regenerator. As shown in fig. 1, the cover plate type poppet valve mainly includes a poppet valve shaft 1, a main seal valve plate a2, an auxiliary valve plate B3, a support sleeve 4, a limit switch box 5, a cylinder 6, etc., the limit switch box 5 is arranged above the cylinder 6, the support sleeve 4 is arranged above the limit switch box 5, the support sleeve 4 fixes and supports the poppet valve shaft 1, and the main seal valve plate a2 and the auxiliary valve plate B3 are arranged at the upper end of the poppet valve shaft 1. The cylinder 6 provides power for the poppet valve, pushes the poppet valve shaft 1 to move up and down, and enables the main sealing valve plate A2 and the auxiliary valve plate B3 to be in an open or closed state; the limit switch box 5 is mainly convenient for installing a limit switch and detects whether a poppet valve is in an open or closed state in a PLC (programmable logic controller) of the RTO (regenerative thermal oxidizer) waste gas treatment system; the supporting sleeve 4 is mainly used for fixing the lifting valve shaft 1 and adopts a sealing device to prevent the exhaust gas in the pipeline from leaking.

The labyrinth sealing device (shown in fig. 2 and 3) for zero leakage of the lift valve of the RTO furnace is mainly used for a sealing device between a valve sealing cover plate and a connecting pipe of the RTO furnace. A main sealing valve plate A2 and an auxiliary valve plate B3 are fixed at the upper end of the poppet valve shaft 1, a circle of annular elastic bulge sealing silica gel pad 7 is arranged on the lower end face of the main sealing valve plate A2 of the poppet valve, and the annular elastic bulge sealing silica gel pad 7 is fixed on the lower end face of the main sealing valve plate A2 through silica gel glue 9; an annular steel plate 8 is welded outside the top end of the RTO furnace connecting pipe 10, two rings of annular elastic bulge sealing silica gel pads 7 are arranged on the annular steel plate 8, and the annular elastic bulge sealing silica gel pads 7 are fixed on the annular steel plate 8 through high-temperature-resistant silica gel glue 9; the distance between the two rings of annular elastic convex sealing silica gel pads 7 outside the RTO furnace connecting pipe 10 is at least 10cm, the horizontal distance between the annular elastic convex sealing silica gel pads 7 and the edge of the main sealing valve plate A2 is at least 2cm, the annular elastic convex sealing silica gel pads 7 on the lower end face of the main sealing valve plate A2 are placed in the middle of the two rings of annular elastic convex sealing silica gel pads 7 outside the RTO furnace connecting pipe 10 (as shown in figure 3), and the requirement of the distance can ensure that when the lifting valve shaft deflects, the sealing effect of the valve plate can still be realized. The height of the annular elastic convex sealing silica gel pad 7 on the lower end face of the main sealing valve plate A2 is required to be less than the height of the annular elastic convex sealing silica gel pad 7 on the outer portion of the RTO furnace connecting pipe 10 by 0.5cm, the height difference is required to ensure that sealing is mainly realized by the annular elastic convex sealing silica gel pad 7 on the outer portion of the RTO furnace connecting pipe 10, the annular elastic convex sealing silica gel pad 7 on the lower end face of the main sealing valve plate A2 assists the sealing form to be labyrinth sealing, and the annular elastic convex sealing silica gel pad 7 on the lower end face of the main sealing valve plate A2 cannot be deformed due to installation errors or long-term use to be a main sealing gasket. The raised sealing silica gel pad is made of high temperature (more than or equal to 300 ℃) resistant silica gel. The cylinder 6 of the lift valve pushes the lift valve shaft 1 to move up and down, the valve plate moves along with the shaft, and when the valve is closed, the annular elastic bulge sealing silica gel pad 7 on the lower end face of the main sealing valve plate A2 is mutually occluded with the two rings of annular elastic bulge sealing silica gel pads 7 outside the RTO furnace connecting pipe 10 to form labyrinth seal.

The utility model discloses make full use of high temperature resistant silica gel pad's corrosion-resistant, elasticity effectively reduces the valve plate and takes over the friction between, and terminal surface and RTO stove take over 10 outsides and set up elastic protruding sealing silica gel pad under main sealing valve plate A2, when promoting the valve shaft because of long-term use or flue gas volume too big emergence skew, the mutual interlock of upper and lower protruding sealing silica gel pad forms the labyrinth and seals and block the flue gas to reach and be close to zero effect of leaking.

Claims

1. A labyrinth sealing device that is used for RTO stove poppet valve zero leakage, its characterized in that: comprises a lift valve, an annular elastic bulge sealing silica gel pad (7), an annular steel plate (8) and an RTO furnace connecting 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 face of the main sealing valve plate A (2) is provided with a circle of annular elastic bulge sealing silica gel pad (7); an annular steel plate (8) is welded outside the top end of the RTO furnace connecting pipe (10), and two rings of annular elastic bulge sealing silica gel pads (7) are arranged on the annular steel plate (8); the annular elastic convex sealing silica gel pad (7) on the lower end face of the main sealing valve plate A (2) and two rings of annular elastic convex sealing silica gel pads (7) outside the RTO furnace connecting pipe (10) are mutually occluded to form a labyrinth sealing structure.

2. The labyrinth sealing device for RTO furnace poppet valve zero leakage of claim 1, wherein: a limit switch box (5) is arranged above the air cylinder (6), a supporting sleeve (4) is arranged above the limit switch box (5), the supporting sleeve (4) is used for fixing and supporting the lifting valve shaft (1), and a main sealing valve plate A (2) and an auxiliary valve plate B (3) are fixed at the upper end of the lifting valve shaft (1).

3. The labyrinth sealing device for RTO furnace poppet valve zero leakage of claim 1, wherein: the distance between two rings of annular elastic bulge sealing silica gel pads (7) outside the RTO furnace connecting pipe (10) is at least 10cm, and the horizontal distance between the annular elastic bulge sealing silica gel pads (7) and the edge of the main sealing valve plate A (2) is at least 2 cm.

4. The labyrinth sealing device for RTO furnace poppet valve zero leakage of claim 1, wherein: an annular elastic bulge sealing silica gel pad (7) on the lower end face of the main sealing valve plate A (2) is placed in the middle of two rings of annular elastic bulge sealing silica gel pads (7) outside the RTO furnace connecting pipe (10).

5. The labyrinth sealing device for RTO furnace poppet valve zero leakage of claim 1, wherein: the height of the annular elastic bulge sealing silica gel pad (7) on the lower end face of the main sealing valve plate A (2) is smaller than that of the annular elastic bulge sealing silica gel pad (7) outside the RTO furnace connecting pipe (10).

6. The labyrinth sealing device for RTO furnace poppet valve zero leakage of claim 1, wherein: the annular elastic bulge sealing silica gel pad (7) is respectively fixed on the lower end face of the main sealing valve plate A (2) and an annular steel plate (8) of the RTO furnace connecting pipe (10) through silica gel glue (9).

7. The labyrinth sealing device for RTO furnace poppet valve zero leakage of claim 1, wherein: the annular elastic convex sealing silica gel pad (7) is made of high-temperature-resistant silica gel.