JPH0329654Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a Gotsuguru valve device, and although it is not exclusive to valve devices that are exposed to relatively harsh conditions, such as valve devices for in-furnace monitoring windows. The present invention relates to a goggle valve device which is particularly suitable as a device.

(Prior Art) Knife valve devices have conventionally been used as valve devices for so-called in-furnace monitoring windows provided for measuring the temperature inside the furnace and sampling gas, but in this type of valve device, A long valve box is required to accommodate the knife valve body, and a groove must be formed to allow the knife valve body to slide, but when the valve is opened, high temperature and sometimes high temperature Moist dust enters and adheres to the valve body and grooves, and eventually becomes sintered and solidified, causing the valve to become damaged in a relatively short period of time due to wear caused by sliding of the knife valve body. There was a defect that reduced functionality.

For this purpose, the applicant proposed replacing the knife valve device with a swing valve device (1983-
55236 Publication).

(Problem to be solved by the invention) In a swing valve device, the valve body swings and comes into contact with the valve seat, and since the valve body does not make sliding movement, it is possible for dust to be interposed between it and the valve seat. It is advantageous in that no wear occurs even when the valve is used, and therefore it has come to be widely used as a valve device for a monitoring window inside a furnace.

However, when the pressure inside the furnace is high, such as in a blast furnace, it is difficult to provide sufficient airtightness with a single swing valve. Therefore, it is necessary to arrange multiple swing valves in multiple stages, and when opening and closing operations, it is difficult to provide sufficient airtightness. The problem was that each swing valve had to be operated in sequence, resulting in low workability.

(Means for Solving the Problems) The present invention basically attempts to solve the above problems by replacing the conventional swing valve device, which has been widely used in this type of application, with a goggle valve device. It is something.

On the same date, we filed a separate utility model registration application for basic improvements in applying the so-called Gotsuguru valve device, which has been used for various purposes, to a valve device for an in-furnace monitoring window. As a result of conducting various tests using this Gotsuguru valve device, it was found that the sealing part of the Gotsuguru valve device reached a temperature of approximately 300°C within about 30 minutes after the start of operation of a furnace, for example, a blast furnace, and that the Gotsuguru plate was opened as a packing. It has been found that the life of the seal ring provided on the closing valve body is shortened. Of course, a sealing inert gas such as nitrogen gas is injected into this seal ring portion through the gas purge hole, but it has been found that this alone cannot sufficiently increase the durability of the seal ring.

Therefore, the Gotsuguru valve device according to the present invention has the first
a fixed cylinder, a second fixed cylinder coaxially arranged opposite to the first fixed cylinder, a movable cylinder disposed outside one of the fixed cylinders and equipped with a pressure-resistant bellows, and the movable cylinder. and the other of the two fixed cylinders, and has an open valve body and a closing valve body, and the two fixed cylinders and the movable cylinder are moved by moving the goguru plate in a suspended state. a goggle plate driving device that aligns the hole to be formed with the open valve body or the closing valve body of the goggle plate; and a goggle plate drive device that drives the movable cylinder to connect the end edge of one of the fixed cylinders and the movable cylinder on the edge side. and a device for pinching the opening valve element or the closing valve element of the Gotsuguru plate with the edge of the Gotsuguru plate, and releasing the pinched state to enable the movement of the Gotsuguru plate, and for releasing the Gotsuguru plate. A seal ring is attached to the valve body and the closing valve body, and a gas purge hole for sealing is formed at the end edge of the movable cylinder on the side of the goggle plate, and one of the fixed cylinders is attached to the gotsuguru plate. A cooling air purge hole is formed in the edge facing the plate, which serves both for sealing and for cooling the seal rings for the open valve element and the closing valve element of the goggle plate.

(Operations and effects of the invention) When the Gotuguru valve device according to the invention is used as a valve device for an in-furnace monitoring window, the open valve body or the closing valve body provided on a single Gotuguru plate is fixed to communicate with the inside of the furnace. Since the opening and closing of the hole is done in unison with the hole in the cylinder, the opening/closing operation is much easier than the individual operation of conventional multi-stage swing valves. Since purging is performed with inert gas or cooling air, the leakage of dust inside the furnace is prevented as much as possible even when the Gotsuguru plate moves, and the life of the seal ring is extended. Since this is carried out in a state in which the goggle plate is not slid on the groove, the so-called effect that wear of the goggle plate does not occur is achieved.

On the outside of the seal portion of the open valve element or the closing valve element of the Gotsuguru plate, for example, a hopper may be provided at the bottom to collect leaking dust, and a partition plate may be arranged below the hopper. If the inside of the fixed cylinder and the inside of the hopper are substantially shut off by the purging of the inert gas and cooling air, the dust inside the hopper can be discharged to the outside at any time by opening the gate valve. (However, from the viewpoint of safety measures, it is preferable to arrange the gate valves in duplicate.) (Example) ) Next, an example of a case where the Gotuguru valve device according to the present invention is applied to a valve device for an in-furnace monitoring window will be specifically described with reference to the drawings.

The Goggle valve device, indicated generally by the reference numeral 10 in FIG. 12
, a second fixed cylinder 14 coaxially arranged opposite to the first fixed cylinder, a movable cylinder 16 arranged outside the first fixed cylinder 12 and equipped with a pressure-resistant bellows 162, and this movable cylinder. 16 and the second fixed cylinder 14
It essentially comprises a Gotsuguru plate 18 disposed between. The first and second fixed cylinders 12,1
4 and the movable cylinder 16 form an entrance/exit part for a lance (not shown) for monitoring the inside of the furnace.

The hydraulic cylinder 2 drives the movable cylinder 16.
0, and in FIG. 1, this hydraulic cylinder operates to move the edge of the movable tube 16 toward the second fixed tube 12, and the end edge of the movable tube 16 and the edge of the second fixed tube 12 are moved. The state in which the Gotsuguru plate 18 is clamped between the two is shown. Of course, if the hydraulic cylinder 20 is rendered inactive, the goggle plate 18 is released from the clamped state.

The goggle plate 18 includes an open valve body 181 and a close valve body (not shown), and seal members 181a and 181b are attached to both outer peripheral surfaces of each of these valve bodies. These sealing members can each be two sealing rings as shown. An extension 183 is provided upright on the goggle plate 18, and this extension is placed on the pair of rolls 22 and attached to a valve body 185 provided with a rack 185a, so that the goggle plate 18 is in a suspended state. is being done. The rack 185a meshes with a sprocket 26 fixed to a spindle 24, and one end of the spindle 24 is connected to a drive source (not shown) such as a hydraulic cylinder or an electric motor via a speed reducer 28 as shown. The other end of the spindle can be connected to a manual handle (not shown) for emergency operation. Therefore, when the goggle plate 18 is not clamped by the hydraulic cylinder 20, if the spindle 24 is powered or manually rotated, the goggle plate moves in a suspended state and the opening valve body is moved. 181a or the closing valve body can be aligned with the lance inlet/outlet hole, thereby allowing the valve device 10 to be in the open or closed state.

If you try to open the Gotsuguru valve device 10 in order to insert a lance for monitoring the inside of the furnace, dust existing in the furnace will enter the valve device 10, especially if the valve device 10 changes from the closed state to the open state. While the goggle plate 18 is being moved in order to move to the
Since the clamping of the cylinders 8 and 8 has been released, there is a possibility that dust may leak outside from between the two cylinders and the goggle plate.

In the Gotuguru valve device 10 according to the present invention,
In order to prevent this dust leakage, the first fixed cylinder 12
A space is formed between the movable cylinder 16 and the movable cylinder 16, and a pressurized inert gas such as nitrogen gas is supplied into this space through a conduit 164. It is ejected from a pore 166a formed in the wall (more specifically, the movable valve seat 166 disposed in contact with the end wall of the movable cylinder 16 as shown in FIG. 2) to provide a seal by a so-called gas purge, On the other hand, the edge of the second fixed cylinder 14 on the Gotsuguru plate 18 side is configured as a double cylinder, and pressurized cooling air is supplied to the space between the double cylinders through a conduit 142, and this cooling air is supplied to the second fixed cylinder 14. The liquid is ejected from a pore 144 formed in the end wall of the cylinder to provide a seal by purging. In this case, as clearly shown in FIG. 2, the cooling air cools the seal portion 181c of the valve body 181 of the goggle plate 18, cools the seal members 181a and 181b attached to this seal portion, and prolongs their life. bring about change. That is, when the valve device 10 is installed, for example, near the top of a blast furnace, the seal portion 181c warps by about 300°C due to the high temperature inside the furnace, resulting in thermal fatigue of the seal rings used as the seal members 181a and 181b. Although it is severe, the degree of fatigue progresses can be alleviated by cooling with cooling air. Excess cooling air is channeled through conduit 144a.
(FIG. 1).

When using a blast furnace, the maximum gas pressure in the furnace is about 3Kg/ ^cm2 , so setting the pressure of nitrogen gas and cooling air for purging to about 3.1 to 3.2Kg/ ^cm2 will achieve the desired value. A sealing function can be achieved.

A hopper 30 (FIG. 1) is provided outside the seal portion 181c, particularly at the lower portion. When the hopper 30 is moving, the hopper 30 is connected from inside the furnace through the first fixed cylinder 12 and when the gap between the movable cylinder 16 and the hopper plate 18 passes through the gap between the second fixed cylinder 14 and the hopper plate 18. It functions to collect dust that leaks out. The dust accumulated in the hopper 30 can be discharged to the outside by opening a gate valve (not shown) provided at the bottom of the hopper. In this case, the first and second
Since the interiors of the fixed cylinders 12 and 14 and the interior of the hopper 30 are actually shut off by the nitrogen gas or cooling air purge, the gate valves provided at the bottom of the hopper 30 must be arranged in multiple stages. However, as a safety measure to prevent dust pollution from occurring, it is preferable to have double upper gate valves.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of the Gotsuguru valve device according to the present invention, and FIG. 2 is an enlarged partial vertical cross-sectional view for explaining the seal and cooling of the seal member in the sealing portion of the Gotsuguru plate. 10... Gotsuguru valve device, 12... first fixed cylinder, 1
4...Second fixed cylinder, 144...Small hole for cooling air purge, 16...Movable cylinder, 166a...Small hole for sealing gas purge, 18...Gotsuguru plate, 181...Opening valve body of Gotsuguru plate 18, 181a, 181b ... Seal member (seal ring) attached to the open valve body 181, 181c... Seal portion of the open valve body 181, 2
0... Hydraulic cylinder for driving the movable cylinder 16, 22... Roll pair for suspending the goggle plate 18, 24... Spindle for driving to move the goggle plate 18, 30...
Hopper for collecting and discharging dust.

Claims (1)

[Scope of utility model registration request] a first fixed cylinder, a second fixed cylinder coaxially arranged opposite to the first fixed cylinder, a movable cylinder arranged outside one of the fixed cylinders and equipped with a pressure-resistant bellows; A goggle plate is disposed between the movable cylinder and the other of the fixed cylinders and has an opening valve body and a closing valve body, and the both fixed cylinders and the movable cylinder are moved by moving the goggle plate in a suspended state. a goggle plate driving device that aligns the hole formed by the opening valve body or the closing valve body of the goggle plate in unison with the opening valve body or the closing valve body of the said goggle plate; and a device for pinching the open valve body or the closing valve body of the Gotsuguru plate with the end edge of the movable cylinder, and releasing the pinched state to enable the movement of the Gotsuguru plate. A seal ring is attached to the open valve body and the close valve body.
A gas purge hole for sealing is formed at the end edge of the movable cylinder on the side of the goggle plate, and a gas purge hole for sealing and a release valve for the goggle plate is formed at the edge of one of the fixed cylinders facing the goggle plate. 1. A Gotsuguru valve device, characterized in that a cooling air purge hole is formed for cooling the seal ring for the valve body and the closing valve body.