What is the sealing ring of the reversing valve of the heating furnace?

Manufacturing method of reversing valve sealing structure of regenerative heating furnace

Technical field:

The utility model relates to a sealing structure of a reversing valve, in particular to a sealing structure of a reversing valve of a regenerative heating furnace.

Background art:

There are many reversing valves in the combustion system of regenerative heating furnace, which make air (gas) and flue gas change valves periodically through the movement of valve plates. By moving the position of the reversing valve plate, the gas flow direction is just opposite to the last cycle, the original regenerator discharging flue gas is replaced by air (gas), and the original regenerator filled with air (gas) is replaced by flue gas. The required air pressure of the reversing valve should be greater than 0. 4 MPa. The design of heating furnace for steel rolling is mainly based on compressed air, supplemented by nitrogen. The heating furnace is fully distributed. The furnace is equipped with 72 pairs of regenerator burners, namely 72 gas regenerator and 72 air regenerator. Each regenerator is independently equipped with a reversing valve, and there are 144 reversing valves in the whole furnace. At present, there are five-way reversing valves, four-way reversing valves and three-way reversing valves used in China, and the two-position three-way reversing valve is commonly used. The structure of this kind of sealing ring mainly presses the outer side of the sealing ring through a steel structure pressure ring, and the steel structure pressure ring and the bottom of the box body are fastened with hexagon socket bolts, and the inner side of the sealing ring protrudes. During the reversing process of the three-way valve, the valve plate presses the convex part inside the sealing ring to achieve the sealing effect. The two-position three-way direct reversing valve in the combustion system of the existing steel rolling heating furnace will have some problems such as burning of the sealing ring and rusting of the sealing ring pressure plate after being used for a period of time. In order not to affect the work, the sealing ring must be replaced. Because the steel structure compression ring that compresses the sealing ring is fastened to the bottom plate of the reversing valve with hexagon socket bolts, some bolts are rusted and cannot be unscrewed when replacing, which is very inconvenient to disassemble and replace, and it is time-consuming and laborious to replace and install the sealing ring every time. On-site statistics need about 2 hours, which increases the maintenance time and time.

The utility model provides a sealing structure of a reversing valve of a regenerative heating furnace, which has the advantages of reasonable structure, simple and quick replacement, shortened maintenance time and reduced maintenance cost. The technical problem to be solved by the utility model is that the steel structure pressure ring and the bottom plate of the reversing valve are fastened by hexagon bolts and embedded into the sealing ring. The purpose of the utility model is realized through the following technical scheme, which comprises a reversing valve bottom plate, a steel structure pressure ring and a sealing ring. The steel structure pressure ring and the bottom plate of the reversing valve are fastened by hexagon socket bolts, and it is characterized in that the steel structure pressure ring is a trapezoidal groove with a trapezoidal cross section, and the lower section of the sealing ring is also trapezoidal; the sealing ring is embedded into the trapezoidal groove on the steel structure pressure ring through the deformation of its lower part, and the upper part of the sealing ring protrudes from the steel structure pressure ring. When the utility model is installed, the steel structure pressure ring is fastened on the bottom plate of the reversing valve through the hexagon socket bolt, and then the sealing ring is embedded into the trapezoidal groove on the steel structure pressure ring through the deformation of the lower part of the sealing ring. When replacing, just take out the damaged sealing ring from the trapezoidal groove on the steel structure pressure ring and replace it with a new one. Compared with the prior art, the utility model is simple and quick to replace, which can shorten the maintenance time and reduce the maintenance cost. It only takes about 5 minutes to remove the sealing strip and only 10 minutes to install it, which greatly saves time and cost.

Fig. 1 is the front view of the utility model; Fig. 2 is a top view of that utility model.

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As shown in figure 1 to figure 2, it includes the reversing valve bottom plate, steel structure pressure ring 2 and sealing ring 1. Steel structure pressure ring and reversing valve bottom plate are fastened with hexagon socket head bolts. The pressure ring of steel structure is trapezoidal groove with trapezoidal cross section, and the lower section of sealing ring is also trapezoidal. The sealing ring is embedded into the trapezoidal groove on the steel structure pressure ring through the deformation of its lower part, and the upper part of the sealing ring protrudes from the steel structure pressure ring. With this new type of sealing ring, the pressure ring cannot be replaced once installed. At the same time, the sealing ring is made of stainless steel, and the sealing ring is made of aviation special high-temperature fluororubber, which can resist high temperature of about 400°C and has better effect. In the field application of 1 year, the heating furnace was overhauled three times, and the sealing ring was not worn and burned.

Claim 1. The invention relates to a sealing structure of a reversing valve of a regenerative heating furnace, which comprises a reversing valve bottom plate, a steel structure pressure ring and a sealing ring, wherein the steel structure pressure ring and the reversing valve bottom plate are fastened by hexagon bolts, and is characterized in that the steel structure pressure ring is a groove with trapezoidal cross section, and the cross section of the lower part of the sealing ring is also trapezoidal; the sealing ring is embedded into the trapezoidal groove on the steel structure pressure ring through deformation of the lower part, and the upper part of the sealing ring protrudes from the steel structure pressure ring.

The utility model discloses a sealing structure of a reversing valve of a regenerative heating furnace, which comprises a reversing valve bottom plate, a steel structure pressure ring and a sealing ring, wherein the steel structure pressure ring and the reversing valve bottom plate are fastened by hexagon bolts; the steel structure pressure ring is a trapezoidal groove with a trapezoidal cross section, and the lower section of the sealing ring is also trapezoidal; the sealing ring is embedded into the trapezoidal groove on the steel structure pressure ring through the deformation of its lower part, and the upper part of the sealing ring protrudes from the steel structure pressure ring. The utility model is simple and quick to replace, which can shorten the maintenance time and reduce the maintenance cost. It only takes about 5 minutes to remove the sealing strip and only 10 minute to install it, which greatly saves time and cost. At the same time, the sealing ring is made of stainless steel, and the sealing ring is made of high-temperature fluororubber, which has better effect. After long-term use, the sealing ring has no wear and burning phenomenon.

The file number is f16k1100gk201858386sq201020571769.

Publication date: 20165438+June 8th, 0 Application date: 2010 65438+1October 22nd Priority date: 2010 65438+1October 22nd.

Inventors Jiang, Cui Xinhua, Applicant: Chengde Special Steel Co., Ltd.

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