CN220488372U - Three-way valve and push steel type heating furnace - Google Patents

Abstract

The application relates to a three-way valve and a push steel type heating furnace, and relates to the field of heating furnaces, which comprises a valve body, a linear driving piece and a sealing piece, wherein the linear driving piece comprises a body and a driving shaft, and the body is positioned outside the valve body; one end of the driving shaft is connected with the body, the other end of the driving shaft stretches into the inner cavity of the valve body, and the driving shaft moves along the axis direction of the driving shaft relative to the body; the sealing piece is arranged on the outer side of the valve body, the sealing piece is sleeved on the transition section in a sealing mode, and the transition section is a part of the driving shaft which does not extend into the inner cavity of the valve body and is close to the valve body. The present application closes the transition section through the closure, has the effect of reducing the amount of leakage of the gas flowing in the three-way valve.

Description

Three-way valve and push steel type heating furnace

Technical Field

The application relates to the field of heating furnaces, in particular to a three-way valve and a push steel type heating furnace.

Background

Currently, reversing valves are used in various types of metallurgical, mechanical and colored equipment. The three bore bodies of the three-way reversing valve are generally round valve ports, and a driving cylinder is used for driving a valve plate to move and lock, so that the communication of different valve ports is realized.

The existing three-way reversing valve adopts a plane sealing mode, the reversing valve is not tightly sealed, internal leakage occurs, gas and smoke are easy to cross gas, carbon monoxide in the smoke exceeds the standard, energy is wasted, and environmental pollution is increased. In the existing scheme, a detection device is arranged at the position of the three-way valve to detect whether gas leaks or not.

When the gas leakage is detected, the seal is replaced, the three-way valve is required to be closed when the seal is replaced, and the influence on production is large.

Disclosure of Invention

The application provides a three-way valve and push away steel formula heating furnace, has the effect of reducing the leakage volume of the gaseous volume that flows in the three-way valve.

The application provides a three-way valve, which comprises a valve body, a linear driving piece and a sealing piece, wherein the linear driving piece comprises a body and a driving shaft, and the body is positioned outside the valve body; one end of the driving shaft is connected with the body, the other end of the driving shaft stretches into the inner cavity of the valve body, and the driving shaft moves along the axis direction of the driving shaft relative to the body; the sealing piece is arranged on the outer side of the valve body, the sealing piece is sleeved on the transition section of the driving shaft in a sealing way, and the transition section is a part of the driving shaft which does not extend into the inner cavity of the valve body and is close to the valve body.

In the technical scheme, the sealing piece is in sealing connection with the valve body, the sealing piece is sleeved outside the transition section in a sealing way, and when gas in the inner cavity of the valve body enters a sealing space enclosed by the sealing piece and the valve body from the connecting part of the driving shaft and the valve body, the gas cannot diffuse outwards, so that the gas leakage of the three-way valve can be reduced.

The sealing piece seals the connecting position of the driving shaft and the valve body to form static seal, which is favorable for keeping the long-term effective sealing connection of the connecting position of the driving shaft and the valve body, thereby prolonging the maintenance period of the three-way valve.

The application also provides a push steel type heating furnace, which comprises a three-way valve.

According to the technical scheme, the leakage amount of the coal gas flowing in the three-way valve is reduced, so that frequent maintenance of the three-way valve is reduced, long-term reliable operation of the three-way valve is facilitated, and the maintenance period of the heating furnace is prolonged.

Drawings

FIG. 1 is a schematic view of the overall structure of an embodiment with sections taken at corresponding locations of the upper cover and drive shaft;

fig. 2 is a schematic overall elevation view of an embodiment.

1. A valve body; 11. a lower case; 12. an upper cover; 2. a linear driving member; 21. a body; 22. a drive shaft; 221. a transition section; 3. a closure; 31. a closing plate; 4. a shaft seal ring; 5. a valve plate.

Detailed Description

The present application is further described in detail below by way of the accompanying drawings and examples. The features and advantages of the present application will become more apparent from the description.

The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.

The embodiment of the application discloses a three-way valve which is used for pushing the upper part of a steel type heating furnace and reversing gas including coal gas through the three-way valve. The pushing steel type heating furnace is used for heating steel billets, the steel billets enter a preheating zone in the furnace to be preheated under the pushing of the pushing steel machine, the steel billets gradually enter a heating zone, and the moving speed is determined according to the sectional area of the steel billets. The isothermal inside the heating furnace ensures that the temperature difference between the inside and the outside of the billet is small and the temperature is uniform, so that part of internal defects are eliminated by deformation during billet rolling.

When the billet is heated in a heating furnace using coal gas as fuel, the three-way valve is a valve for controlling the coal gas, air and combustion smoke in the furnace to be fed into the furnace and discharged, and the three-way valve has three ports for leading in and leading out, and two ports of each valve are alternately used. The burners on the two sides of the heating furnace are used alternately, so that the three-way valve can be used for alternately using air intake and exhaust.

In this embodiment, the temperature of the gas flowing in the three-way valve is generally about 120 ℃, and the period of switching the communication between the different ports of the three-way valve is about 60 seconds.

Referring to fig. 1, the three-way valve comprises a valve body 1, a linear driving member 2, and a closing member 3, wherein the linear driving member 2 comprises a body 21 and a driving shaft 22, wherein the body 21 is located outside the valve body 1; one end of the driving shaft 22 is connected with the body 21, the other end extends into the inner cavity of the valve body 1, and the driving shaft 22 moves along the axis direction of the driving shaft 22 relative to the body 21.

The sealing piece 3 is positioned at the outer side of the valve body 1, the sealing piece 3 is fixedly connected with the valve body 1 in a sealing way, the sealing piece 3 is sleeved on the transition section 221 in a sealing way, and the transition section 221 is a part of the driving shaft 22 which does not extend into the inner cavity of the valve body 1 and is close to the valve body 1.

For convenience of explanation, a first direction is defined, which is a moving direction of the driving shaft 22 of the linear driving member 2, and in the drawings, the first direction is denoted as an X direction.

Specifically, the valve body 1 has a closed inner cavity for gas flow, and a plurality of valve ports for connection with an external pipeline are arranged on the valve body 1. The valve body 1 is internally and fixedly provided with a baffle plate, the baffle plate cuts off the inner cavity of the valve body 1, and the baffle plate is provided with a communication hole. The valve body 1 is also internally provided with a valve plate 5, the valve plate 5 can move to be in contact with the partition plate and cover the communication hole, the partition of the corresponding valve port is realized, and the valve plate 5 moves to be separated from the partition plate, so that the communication of the corresponding valve port is realized. The valve plates 5 are arranged in one-to-one correspondence with the communication holes, and in this embodiment, two valve plates 5 are arranged with the communication holes.

The linear driving member 2 is connected with the valve body 1, a driving shaft 22 of the linear driving member 2 is fixedly connected with the valve plate 5, and the linear driving member 2 drives the valve plate 5 to move along the first direction and lock at a set position. The linear drive 2 is illustratively a cylinder. Alternatively, the linear driving member 2 is a hydraulic cylinder, or a linear stepping motor. The body 21 is a block of a cylinder, and the driving shaft 22 is a piston rod of the cylinder. The set positions comprise a first position and a second position, wherein the first position is a position where the valve plate 5 covers the corresponding communication hole, and the second position is a position where the valve plate 5 is separated from the partition plate, so that different valve ports are communicated through the communication hole.

The transition section 221 is schematically indicated in the drawing by a dashed box, the transition section 221 comprising a portion of the drive shaft 22 connected to the valve body 1 and a portion of the drive shaft 22 not extending into the interior cavity of the valve body 1 and being adjacent to the valve body 1.

The joint of the sealing piece 3 and the valve body 1 is sealed, the sealing piece 3 is sleeved outside the transition section 221, and when gas leaks from the inner cavity of the valve body 1 through the joint of the driving shaft 22 and the valve body 1, the gas can be sealed in a space surrounded by the sealing piece 3 and the valve body 1 by the sealing piece 3, so that the gas leakage of the three-way valve is reduced.

The connection between the drive shaft 22 and the valve body 1 requires frequent relative movements and the connection of the drive shaft 22 and the valve body 1 is at a high temperature. In this embodiment the three-way valve is operated once per minute on the drive shaft 22 and the temperature in the three-way valve is approximately 140 degrees celsius.

Compared with the sealing between the driving shaft 22 and the valve body 1 by using a dynamic sealing ring with high heat resistance and wear resistance at the joint of the driving shaft 22 and the valve body 1, the sealing piece 3 is used for sealing connection with the valve body 1, and is sleeved outside the transition section 221. When the gas in the inner cavity of the valve body 1 enters the closed space enclosed by the sealing piece 3 and the valve body 1 from the joint of the driving shaft 22 and the valve body 1, the gas cannot diffuse outwards, and the gas leakage of the three-way valve can be reduced.

The sealing piece 3 seals the joint of the driving shaft 22 and the valve body 1 into static seal, which is helpful for keeping the long-term effective sealing connection of the joint of the driving shaft 22 and the valve body 1, thereby prolonging the maintenance period of the three-way valve.

Referring to fig. 1, as an alternative, the closure 3 comprises a sleeve, one end of the closure 3 being in sealed fixed connection with the valve body 1 and the other end being in sealed fixed connection with the body 21

In particular, the closure 3 comprises a sleeve open at both ends and hollow in the middle. The closure member 3 is closed on itself, and the junction between the closure member 3 and the body 21 and the junction between the closure member 3 and the valve body 1 remain closed.

The shape and structure of the kit is determined according to design requirements, and the kit is a square sleeve. Optionally, the sleeve is a round sleeve or a polygonal sleeve.

Referring to fig. 1, as an alternative, the closure member 3 includes a plurality of closure plates 31, the plurality of closure plates 31 being fixedly connected to form a kit, one end of the closure plate 31 being fixedly connected to the valve body 1 in a sealing manner, and the other end being fixedly connected to the body 21 in a sealing manner.

Specifically, the closing plate 31 is a square plate, the length of the closing plate 31 is along the first direction, the plurality of closing plates 31 are connected in a sealing way from head to tail in sequence to form a sleeve, one end of the closing plate 31 is fixedly connected with the valve body 1, and the other end of the closing plate 31 is fixedly connected with the body 21. Illustratively, the sealing plates 31 are welded and fixed with the valve body 1, and the sealing plates 31 are welded with the body 21.

In other embodiments, the sealing plate 31 is fixedly connected with the valve body 1 and the body 21 by using a connecting piece, and illustratively, the sealing plate 31 is detachably and fixedly connected with the valve body 1 by using a bolt-nut assembly, and the bolt-nut assembly tightly presses and fits between the sealing plate 31 and the valve body 1. The closing plate 31 and the body 21 are detachably and fixedly connected by using a bolt and nut assembly, and the bolt and nut assembly tightly presses and adheres the closing plate 31 and the body 21.

Further, a flange is provided on the sealing plate 31, and the sealing plate 31 is fixedly connected with the valve body 1 through the flange.

Referring to fig. 1, as an alternative, the heat resistant temperature at the junction of the closing plate 31 and the valve body 1 is greater than 140 degrees celsius.

Illustratively, the sealing plate 31 is welded and fixed with the valve body 1, and optionally, the sealing plate 31 is pressed and fixed with the valve body 1 by using a bolt-nut assembly. Or the sealing plate 31 and the valve body 1 are fixedly connected by heat-resistant glue.

The higher the heat-resistant temperature at the junction of the closing plate 31 with the valve body 1, the less the heat of the valve body 1 itself and the gas entering the inner cavity of the closure member 3 have an influence on the tightness of the junction of the closing plate 31 with the valve body 1.

Further, the heat resistant temperature of the closing plate 31 is greater than 140 degrees celsius. Specifically, the sealing plate 31 is a steel plate, and optionally, the sealing plate 31 is an aluminum plate.

Further, the material of the closing plate 31 is the same as that of the valve body 1. The material of the sealing plate 31 is the same as that of the valve body 1, and the thermal expansion coefficient of the sealing plate 31 is the same as that of the valve body 1, so that the stress at the joint caused by different expansion generated by heating between the sealing plate 31 and the valve body 1 can be reduced.

Referring to fig. 2, as an alternative, the closure member 3 is fitted over the portion of the drive shaft 22 located outside the valve body 1 and the body 21.

Specifically, the straight line driving piece 2 is sleeved on the sealing piece 3, and is positioned at the outer part of the valve body 1, the sealing piece 3 is fixedly connected with the valve body 1 in a sealing way, and at the moment, the straight line driving piece 2 is positioned in a sealing space surrounded by the sealing piece 3 and the valve body 1.

The closing member 3 is provided with a pipeline hole, through which the pipeline required by the linear driving member 2 passes, and the pipeline is sealed and fixed with the closing member 3 at the pipeline hole.

Referring to fig. 1, as an alternative, two linear driving members 2 are provided, two closing members 3 are provided, and two closing members 3 are in one-to-one correspondence with the two linear driving members 2.

Referring to fig. 1, specifically, one linear driving member 2 is connected to one valve plate 5, two linear driving members 2 are respectively connected to two valve plates 5 in a one-to-one correspondence manner, and the linear driving members 2 drive the valve plates 5 to move to a set position to realize closing of different valve ports of the three-way valve.

The two sealing pieces 3 are respectively in one-to-one correspondence with the two linear driving pieces 2, so that the specification of the sealing pieces 3 is reduced, the sealing pieces 3 are convenient to install and connect with the valve body 1 and the body 21, and when a single sealing piece 3 breaks down, the single sealing piece 3 is relatively convenient to maintain.

In other embodiments, the number of linear drives 2 is correspondingly set according to the number of valve plates 5.

As an alternative, referring to fig. 2, the closure 3 is provided with one, one closure 3 enclosing all linear drives 2.

Referring to fig. 1, as an alternative, the valve further includes a shaft sealing ring 4, the shaft sealing ring 4 is sleeved outside the driving shaft 22, and the shaft sealing ring 4 is located at a position where the driving shaft 22 penetrates through the valve body 1.

Specifically, the shaft seal ring 4 is a dynamic seal ring, and the shaft seal ring 4 is a silicone rubber seal ring by way of example. Optionally, the shaft sealing ring 4 is a nitrile rubber sealing ring.

It should be noted that, in the conventional three-way valve, a sealing ring is disposed at a joint between the driving shaft 22 and the valve body 1 to perform movable sealing, but the sealing ring is easy to fail after a period of use due to high temperature of the movable sealing ring and frequent movement of the driving shaft 22. In this embodiment, although the sealing member 3 is provided to seal the junction between the drive shaft 22 and the valve body 1, the shaft seal ring 4 is provided at the junction between the drive shaft 22 and the valve body 1.

When the driving shaft 22 moves in the first direction, the shaft seal ring 4 seals the connection position of the driving shaft 22 and the valve body 1, and the leakage amount of the three-way valve is further reduced.

Referring to fig. 1, as an alternative, the valve body 1 includes a lower case 11 and an upper cover 12, the upper cover 12 is fastened to an opening of the lower case 11, and the upper cover 12 is fixedly connected with the lower case 11 in a detachable manner; the closure 3 is fixedly connected to the upper cover 12 in a sealing manner.

Specifically, the inner cavity of the lower shell 11 is the inner cavity of the valve body 1, the lower shell 11 is provided with an opening, the upper cover 12 is buckled on the opening of the lower shell 11, and the upper cover 12 is connected with the lower shell 11 to form a closed inner cavity of the valve body 1. The open end of the lower shell 11 is provided with an outward flange, and the upper cover 12 is detachably and fixedly connected with the lower shell 11 by using a plurality of bolt and nut assemblies.

The sealing piece 3 is fixedly connected with the upper cover 12, and when the maintenance of the three-way valve is needed, the upper cover 12 and the lower shell 11 can be detached, so that the sealing piece 3 and the lower shell 11 can be separated, and the maintenance of the three-way valve is convenient.

Further, the outside of the contact surface of the closing member 3 with the upper cover 12 is sealed with a metal wrapping gasket.

The application also provides a push steel type heating furnace, which comprises a three-way valve and a furnace body, wherein the inner cavity of the furnace body is in gas exchange with the outside through the three-way valve.

By reducing the leakage quantity of the gas flowing in the three-way valve, frequent maintenance of the three-way valve is reduced, long-term reliable operation of the three-way valve is facilitated, and the maintenance period of the heating furnace is prolonged.

In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "left", "right", etc. are based on the directions or positional relationships in the working state of the present application, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly specified and limited otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The present application has been described in connection with the preferred embodiments, but these embodiments are merely exemplary and serve only as illustrations. On the basis of this, many alternatives and improvements can be made to the present application, which fall within the scope of protection of the present application.

Claims (9)

1. A three-way valve is characterized by comprising a valve body, a linear driving piece and a sealing piece; wherein,

the linear driving member includes a body and a driving shaft, wherein,

the body is positioned outside the valve body;

one end of the driving shaft is connected with the body, the other end of the driving shaft stretches into the inner cavity of the valve body, and the driving shaft moves along the axis direction of the driving shaft relative to the body;

the sealing piece is positioned at the outer side of the valve body, the sealing piece is fixedly connected with the valve body in a sealing way, a transition section is sleeved on the sealing piece in a sealing way, and the transition section is a part of the driving shaft which does not extend into the inner cavity of the valve body and is close to the valve body.

2. The three-way valve of claim 1, wherein the closure member comprises a sleeve member having one end in sealed fixed connection with the valve body and the other end in sealed fixed connection with the body.

3. The three-way valve of claim 2, wherein the closure member comprises a plurality of closure plates fixedly connected to form the sleeve, the closure plates being fixedly connected at one end to the valve body and at the other end to the body.

4. The three-way valve of claim 2, wherein the heat resistant temperature at the junction of the closure member and the valve body is greater than 140 degrees celsius.

5. The three-way valve of claim 1, wherein the closure member encases a portion of the drive shaft outside the valve body and the body.

6. The three-way valve according to any one of claims 1 to 5, wherein two of the linear driving members are provided, two of the closing members are provided, and two of the closing members are in one-to-one correspondence with two of the linear driving members.

7. The three-way valve according to any one of claims 1 to 5, further comprising a shaft seal ring sleeved outside the drive shaft, the shaft seal ring being located at a position where the drive shaft passes through the valve body.

8. The three-way valve according to any one of claims 1 to 5, wherein the valve body comprises a lower housing and an upper cover, the upper cover being fastened to the opening of the lower housing, the upper cover being fixedly connected to the lower housing in a detachable manner; the sealing piece is fixedly connected with the upper cover in a sealing way.

9. A push steel heating furnace comprising the three-way valve according to any one of claims 1 to 8.