JPS63285370A - Gas shutting-off device - Google Patents

Abstract

PURPOSE:To effectively strip dust deposited on a valve body for ensuring secure sealing by mounting a seal plate provided with flexibility on the peripheral edge of blades of the pivotable valve body and providing an edge portion on the edge of a valve seat. CONSTITUTION:Flexible long and short seal plates 101, 102 are mounted on the edge of a valve body 1 consisting of blades 7 sticked to a rotary shaft 6. A valve seat 103 is constituted from a steel pipe shaft 104 and a pair of long auxiliary valve seats 105 fixedly secured to the shaft 104. The front end 105a of said valve seat 105 is formed like an edge. Also, a short valve sent 106 corresponding to said seal plate 102 is fixed to a valve box 3, and said box 106 is formed on the front end 106a with an edge portion. Thus, dust attached to the seal plates 101, 102 is scraped off by the edge portions 105a, 106a in closing the valve to provide a secure seal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a gas cutoff device, and particularly to one capable of effectively peeling off attached dust and providing a reliable seal.

(Conventional technology) A conventional example will be explained with reference to FIGS. 5 and 6.

FIG. 5 is a perspective view of a multi-blade damper of a gas cutoff device,
FIG. 6 is an enlarged perspective view of a portion thereof. In the figure, reference numeral 1 is a valve body, and reference numeral 2 is a valve seat. These valve body 1 and valve seat 2 are housed in a valve box 3. The above valve J! ! 2 is made of a steel pipe and is fixed to the valve box 3.

Further, a partition plate 5 is attached to the valve seat 2, and the inside of the valve box 3 is divided into a plurality of cutoff chambers by the partition plate 5 (three seedlings are shown in the figure). On the other hand, the valve body 1 is composed of a rotating shaft 6 and a vane 7 fixed to the rotating shaft 6,
Further, a flexible long sealing plate 8 and a short sealing plate 9 are attached to the long and short edges of the blade 7.

According to the above configuration, the redunder is opened and closed by rotating the valve body 1 about the rotating shaft 6 using a driving groove (not shown). When the damper is closed, the long seal plate 8 comes into contact with the valve seat 2, and the short seal plate 9 comes into contact with the inner surface of the valve body 3 or forms a small gap), thereby creating a seal.

(Problem that the invention attempts to solve) According to the above configuration, there are the following problems.

(2) That is, a large amount of dust adheres to the long seal plate 8, short seal plate 9, valve seat 2, etc. of the multi-blade damper described above, and it also adheres in an uneven manner.

For example, considering the case where dust adheres to the valve seat 2, when the damper is closed, the long seal plate 8 is simply pressed against the valve seat 2 while sandwiching the adhered dust. If the attached dust were to peel off partially, that part would become a gap and the airtight state would be impaired. This also applies when a foreign object is caught between the long seal plate 8 and the valve seat 2, and if a foreign object is caught between the long seal plate 8 and the valve seat 2, the valve body 1 must be driven. There is concern that an excessive load will be applied to the l1 mechanism and it will be damaged.

■On the other hand, regarding the short seal plate 9, this short seal plate 9 does not have anything equivalent to the valve seat 2, and as mentioned above, it closes with a gap between it and the inner surface of the valve body 3. Alternatively, a configuration is adopted in which the valve body 3 is brought into contact with the inner surface of the valve body 3 in anticipation of deflection. By the way, the longitudinal dimension of the damper can be up to 4 m in the case of large dampers, and in that case, the length of the damper is 4 m.
The difference in thermal expansion is more than 1.5 times. Therefore, in the case where a gap exists between the short seal plate 9 and the inner surface of the valve body 3, the gap becomes even larger due to the above-mentioned difference in thermal expansion, making it impossible to maintain airtightness. On the other hand, if bending is expected, the durability of the short seal plate 9 will be impaired due to wear etc.
Moreover, a large load is also placed on the drive mechanism.

The present invention has been made based on the above points, and its purpose is to maintain an airtight state and maintain the soundness of the drive mechanism by effectively peeling off the adhered dust, and to maintain the soundness of the valve body. To provide a gas cutoff device equipped with a multi-blade damper capable of forming a reliable seal without damaging the gas.

(Means for Solving the Problems) That is, the gas cutoff device according to the present invention includes a valve box, one or more cutoff chambers formed in the valve box, and the cutoff chamber rotatably arranged in the cutoff chamber. A valve body that opens and closes the cutoff chamber, a flexible seal plate attached to the peripheral edge of the blade of the valve body, and a seal plate attached to the valve box so that the valve body rotates in a direction to close the cutoff chamber. The valve seat includes a valve seat having an edge portion on its edge that slides into contact with the seal plate to remove dust attached to the seal plate and forms an airtight state with the seal plate when the shutoff chamber is closed. That is.

(Function) In other words, the valve seat is arranged around the entire circumference of the seal plate attached to the edge of the valve body, and an edge part is installed on the edge of this valve seat, and the dust attached to the seal plate is removed by this edge part. In addition to removing it, it also creates a highly accurate seal.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. It should be noted that the same parts as in the prior art are denoted by the same reference numerals and the explanation thereof will be omitted. First, the structure of the valve body 1 of this embodiment will be explained. As described above, the valve body 1 is composed of the rotating shaft 6 and the vanes 7 fixed to the rotating shaft 6. A long seal plate 101 is attached to the longitudinal edge of the blade 7, and a short seal plate 102 is attached to the short edge. The long seal plate 1o1 and the short seal plate 102 have flexibility.

On the other hand, the valve seat 103 is composed of a shaft 104 made of a steel pipe and a pair of elongated auxiliary valve seats 105 fixed to the shaft 104. The long auxiliary valve seat 105 has an edge-shaped tip as shown in FIG. remove. Note that this valve seat 103 is for the long seal plate 1, and in this embodiment, a short valve seat 106 for the short seal plate 102 is separately installed. The short valve seat 106 is fixed to the valve box 3, and is made of equal-sided angle steel in this embodiment. A portion indicated by reference numeral 106a in the figure is a leading edge portion for removing dust attached to the short seal plate 102.

The operation will be explained based on the above configuration. The valve body 1 rotates around a rotating shaft 6 by a drive mechanism (not shown), thereby opening and closing the damper. Then, when the valve body 1 is rotated to close the damper, the long seal plate 101 and the short seal plate 102 attached to the edge of the blade 7 are connected to the tip edge portion 105a of the long auxiliary valve seat 105 and the short valve seat 106. comes into contact with the tip edge portion 106a of. Then, when the rotary shaft 6 is roughly rotated in the direction to close the damper, the long seal plate 1
01 and the tip edge portion 105a of the long auxiliary valve seat 105 are in sliding contact with each other, and the short seal plate 102 and the tip edge portion 106a of the short valve seat 106 are in sliding contact with each other. As a result, the dust attached to the long seal plate 101 and the short seal plate 102 is removed from the tip edge portion 1 of the long auxiliary valve seat 105.
05a and the tip edge portion 106a of the short valve seat 106. After that, the rotating shaft 6 stops after being rotated by a predetermined amount, and as shown in FIG. A seal is formed by the tip edge portion 106a to form a reliable airtight state. Note that FIG. 3 shows the fully open state, and FIG. 4 shows the fully open state.

According to this embodiment, the following effects can be achieved.

■First, the valve seat 103 is equipped with a long auxiliary valve seat 105 having a tip edge portion 105a.
Dust attached to the long seal plate 101 can be effectively removed by the tip edge portion 105a. Also short seal plate 1
02 is also effectively scraped off by the tip edge portion 106a of the short valve seat 106. Therefore, as in the conventional case, each seal plate 101 and 102 and the valve seat 103 and 1
The damper will not be closed when there is dust attached between it and the damper, and the problem of the dust partially peeling off in the closed state and creating a gap in that area will definitely be avoided. Avoided. Furthermore, the problem of excessive load being applied to the drive mechanism due to the presence of foreign matter is also effectively solved.

■Next, a short valve seat 106 is also installed on the short seal plate 102 in the transverse direction, and the configuration is such that sealing is achieved with the tip edge portion 106a of the short valve seat 106, and the tip of the short seal plate 102 and the valve Since the structure has a sufficiently large distance from the inner surface of the box 3, there is no need for the conventional structure of bending the seal plate to maintain airtightness.
When the damper is open, the upper end of the short damper 102 is not restricted. Therefore, there was a concern about the short seal plate 10.
The problem of loss of integrity due to constant flexing of 1 is effectively solved and the seal is ensured.

(2) Since the shutoff performance and mechanical strength of the shutoff device have been improved, the cost required for maintenance and inspection can be reduced, and when applied to a dust collector, the performance can be effectively improved.

It should be noted that the present invention is not limited to the one embodiment described above, and various configurations can be considered, for example, regarding the number and arrangement of the blocking chambers.

[Effects of the Invention] As detailed above, the gas cutoff device according to the present invention has great effects such as being able to provide a reliable sealing state while maintaining its integrity over a long period of time.

[Brief explanation of the drawing]

Figures 1 to 4 are diagrams showing one embodiment of the present invention.
The figure is a perspective view showing a part of the gas cutoff device, Figure 2 is a perspective view showing a part of Figure 1 in detail, Figure 3 is a plan view showing the state when fully open, and Figure 4 is a perspective view when fully open. A plan view showing the state, FIGS. 5 and 6 are views showing a conventional example, FIG. 5 is a perspective view showing a part of the gas cutoff device, and FIG. 6 shows a part of FIG. 5 in detail. FIG. 1... Valve body, 3... Valve box, 6... Rotating shaft, 7...
- Vane, 101... Long seal plate, 102... Short seal plate, 103... Valve seat, 104... Shaft, 105
...Long auxiliary valve seat, 106a...Tip edge part, 1
06... Short valve seat, 106a... Tip edge portion.

Claims (1)

[Claims] A valve box, one or more shutoff chambers formed in the valve box, a valve body rotatably disposed within the shutoff chamber to open and close the shutoff chamber, and attached to the peripheral edge of the blade of the valve body. A flexible sealing plate is attached to the valve body, and when the valve body rotates in a direction to close the shutoff chamber, it slides into contact with the sealing plate, removes dust attached to the sealing plate, and closes the shutoff chamber. A gas cutoff device comprising: a valve seat having an edge portion that forms an airtight state with a seal plate when the valve seat is closed;