JPH0449425Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a high-temperature gas valve device that interrupts the flow of high-temperature gas such as engine exhaust gas.

<Prior Art> Conventionally, as this type of high-temperature gas valve device, a butterfly valve as shown in FIG. 8, for example, is known. This butterfly valve 51 has a ring-shaped housing 52 and
A disk-shaped valve body 53 having an outer diameter approximately equal to the inner diameter of this housing is rotatably fitted through its center shafts 53a and 53b, and the entire outer circumference of the valve body 53 is made of metal or PTFE. A flexible and heat-resistant sealing sheet 54 made of (polytetrafluoroethylene) resin is attached. and,
For example, it is installed upstream of a heat exchanger installed in the exhaust pipe of a diesel engine for exhaust heat recovery.
By rotating the central shaft 53a with a worm gear or lever (not shown), the sealing sheet 54 is brought into close contact with the inner periphery of the circular housing 52 in a radial direction while the valve body 53 closes the flow path. , cut off the exhaust gas supply to the heat exchanger.

<Problem to be solved by the invention> However, in the conventional butterfly valve 51, the valve body 53
The valve body 53 is rotated by inserting the central shafts 53a and 53b protruding upward and downward into the shaft holes provided through the housing 52, so that the sealing sheet 54 on the outer periphery of the valve body is aligned with the vertical central axes. 53a, 53b
It has the disadvantage that it is discontinuous or incomplete in some parts and cannot completely shut off exhaust gas. In addition, since the exhaust gas is blocked only by the elastic force in the radial direction of the sealing sheet 54, the seal is not sufficient, and the rotation of the valve body 53 as the flow path opens and closes causes a large torsional force to act on the sealing sheet 54. Since the sealing sheet 54 is also severely worn, a problem arises in its long-term exhaust gas blocking performance. Furthermore, since the exhaust gas is at a high temperature of 400 to 500 degrees Celsius, large thermal distortion occurs when the material of the valve body 53 is uneven, which immediately affects the clearance of the sealing sheet 54, resulting in exhaust gas blocking performance. It has the disadvantage of lowering the

Therefore, the purpose of the present invention is to provide a high-temperature gas valve device that is easy to operate and inexpensive, which can cut and shut the flow of high-temperature gas with a high sealing effect, using a simple structure that replaces the conventional butterfly valve. It is to provide.

<Means for Solving the Problems> In order to achieve the above object, the high-temperature gas valve device of the present invention has a valve seat provided on the inner circumference of the casing, and valve seats on the inlet side and the outlet side that touch and separate from the valve seat. a valve plate disposed within the casing so as to be able to interrupt communication with the valve; a valve stem that is moved up and down relative to the seat; a closing plate that is fixed to the valve stem so as to close the gap between the wall hole and the valve stem from within the casing when the valve plate is lifted from the valve seat; Heat-resistant gaskets are provided at the contact portion between the valve seat and the valve plate and the contact portion between the closing plate and the inner surface of the casing.

<Function> The other end of the valve stem protruding from the wall hole of the casing to the outside is provided with driving means such as a lever, an air cylinder, a feed handle screwed into a male thread provided on the valve stem, or the like. Now, when opening the valve device, when the valve stem is raised to the lift position via the driving means, the valve plate pivotally attached to one end of the valve stem will move.
The valve is lifted from the valve seat to open the flow path in the casing, and the closing plate fixed to the valve stem comes into contact with the inner surface of the casing to close the gap between the valve stem and the wall hole.
At this time, the valve stem is securely held in the lifted position by the driving means, so the heat-resistant gasket at the abutting part is compressed airtight between the closing plate and the casing, preventing high-temperature gas from leaking from the wall hole to the outside. The hot gas flows through the open channel inside the casing. next,
When closing the valve device, the valve stem is lowered via the driving means to a position where the valve plate comes into close contact with the valve seat, and this position is maintained. Then, the heat-resistant packing provided without any discontinuity between the valve plate and the valve seat is compressed airtight, completely blocking the flow of high-temperature gas from the inlet side to the outlet side. At this time, the valve plate and the valve seat are pressed against each other with great force via the valve stem pivotally connected to the valve plate, so the heat-resistant packing does not wear out due to torsional force as in the conventional case. Even if some uneven thermal strain occurs on the valve plate, a high sealing effect can be achieved.

<Example> Hereinafter, the present invention will be explained in detail with reference to the illustrated example.

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the high-temperature gas valve device of the present invention, in which 1 has an inlet 2a at one end;
A casing consisting of an elbow-shaped flow path portion 2 having an outlet 2b at the other end, and a valve rod mounting portion 3 protruding from the flow path portion 2 in a straight line with the inlet 2a; 4 is a casing of the flow path portion 2; A valve seat 5 is annularly provided on the inner periphery of the inlet 2a side, and 6 is a valve plate disposed within the flow path section 2 so as to be able to approach and separate from the valve seat 4 from the outlet 2b side to open and close the flow path. The tip end 6a is connected to the center bracket 5a of the valve plate 5 with a pin 7, and the rear end 6b side provided with the male thread 8 is connected to the center hole 9 of the blind cover 9 of the valve stem attachment part 3.
This is a valve stem that is arranged to protrude outward from a.

In addition, 10 is a boss 10 on the male thread 8 of this valve stem 6.
An opening/closing handle is screwed into the aperture of a, is supported on the blind lid 9 by a bearing 11, and rotates to move the valve stem 6 up and down with respect to the valve seat 4; 12 is the flow path section 2;
An annular stopper 13 provided diagonally at the boundary between the valve stem mounting portion 3 and the stopper 12 closes the gap between the central hole 9a of the blind cover and the valve stem 6 from the inside at the lift position where the valve plate 5 is in contact with the stopper 12. The closing plate 14 is fixed to the valve stem 6 as shown in FIG. It is a ring-shaped heat-resistant packing.

The boss 10a of the opening/closing handle 10 is connected to the valve stem 6.
In order to align the valve stem with the central axis of the valve stem mounting part 3, the small diameter part 10b at the lower end is fitted into the central hole 9a of the blind cover, and the rim 10d connected to the boss 10a via the arm 10c has a A protrusion 10e for manual rotation is provided. The valve plate 5 pin-jointed to the tip of the valve stem 6 is moved up and down by the rotation of the opening/closing handle 10, and when the valve stem 6 is pushed down by the opening/closing handle 10 at the seated position shown by the solid line in FIG. The heat-resistant gaskets 14, 14 are closely attached to each other with great force, completely blocking the inflow of high-temperature gas from the inlet 2a. Further, when the valve stem 6 is pushed up by the opening/closing handle 10 at the lift position shown by the broken line in FIG. 1, it comes into close contact with the diagonal stopper 12.
The closing plate 13 fixed to the valve stem 6 is tightly attached to the blind lid 9 via heat-resistant gaskets 14, 14 with great force,
The high temperature gas flowing in the flow path section 2 is prevented from leaking from the inside of the valve stem mounting section 3 to the outside through the central hole 9a. In addition, the heat-resistant packing 14
Asbestos and glass wool are used.

The operation of the high-temperature gas valve device having the above configuration will be described next.

First, when opening the valve device, open/close handle 1
0 by hand to pull up the valve preventer 6 and raise the valve plate 5. When the left edge of the valve plate 5 comes into contact with the lowermost end of the stopper 12 provided diagonally within the flow path section 2, the valve plate 5 tilts as the valve stem 6 is pulled up, as shown by the broken line in FIG. It comes into close contact with the stopper 12 at the lift position. Further, the closing plate 13 of the valve stem 6 is in close contact with the back surface of the blind lid 9 via heat-resistant gaskets 14, 14, and this close contact is ensured by the large upward tightening force of the valve stem 6 by the opening/closing handle 10. is maintained.
In this way, the flow path in the flow path portion 2 of the casing 1 is opened, and the high-temperature gas that has flowed in from the inlet 2a flows through this flow path toward the outlet 2b, and the heat-resistant Patsukin 1
4 and 14, the closing plate 13 is in close contact with the blind lid 9, completely preventing leakage of high-temperature gas from inside the valve stem mounting portion 3 to the outside through the central hole 9a. Also, a valve plate 5 is rotatably connected to the lower end of the valve stem 6.
Since the flow path is opened by bringing the valve into contact with the obliquely provided stopper 12, there is an advantage that the stroke of lifting the valve stem to open the valve can be reduced.

Next, when closing the valve device, open/close handle 1
0 by hand to lower the valve stem 6 to the position where the valve plate 5 is in close contact with the valve seat 4 via the heat-resistant gaskets 14, 14, and the valve stem 6 is moved downward through the opening/closing handle 10. Securely held with large tightening force. In this way, the flow path in the flow path section 2 of the casing 1 is closed, completely blocking the flow of high temperature gas from the inlet 2a to the outlet 2b. In this way, Kaisei,
In either case, the opening/closing handle 10 and the valve stem 6
Due to the large tightening force exerted by the movable part, the heat-resistant gasket 14 of the closing plate 13 or the valve plate 5 is brought into close contact with the heat-resistant gasket 14 of the blind cover 9 or the valve seat 4, which is the stationary part, in the direction of contact and separation. Because I am forced to
Unlike conventional butterfly valves, large torsional forces are not applied to the seal each time it is opened or closed, which not only greatly extends the life of the seal, but also prevents the valve plate 5 and closing plate 13 from suffering from some uneven thermal strain. Even if this occurs, a high sealing effect is exhibited.

FIG. 2 is a longitudinal sectional view showing another embodiment of the present invention. In this embodiment, the casing 1 of the embodiment described in FIG. The portion 23 is provided diagonally, and the valve rod 26 is inserted into the central hole 29a of the blind cover 29 of the valve rod attachment portion 23 so as to be freely slidable in the diagonal direction. The valve stem 26 is not provided with a male thread and is manually slid using a clamping device (not shown); however, the other configurations of the valve device are the same as in the embodiment shown in FIG. Constituent members are given the same numbers and explanations are omitted.

This embodiment operates as follows. At the seating position shown by the solid line in FIG.
and clamp the valve stem 26 in this state. Then, the flow path in the straight pipe 22 is closed, and the flow of high-temperature gas from the inlet 22a to the outlet 22b is completely blocked. On the other hand, pull the valve stem 26 by hand, tilt the valve plate 5 as shown by the broken line in the figure, and bring it into close contact with the inner wall so as to cover the side hole 22c of the straight pipe 22. In this state, clamp the valve stem 26. do. Then, straight pipe 22
The flow path inside is opened, and the closing plate 13 fixed to the valve stem 26 is opened to the center hole 29a of the valve stem mounting part 23.
It is tightly attached to the blind lid 29 via the heat-resistant gaskets 14, 14 so as to close it. In this way, the high-temperature gas from the inlet 22a flows toward the outlet 22b, and leakage of the high-temperature gas from inside the valve stem mounting portion 23 to the outside through the central hole 29a is completely prevented. This embodiment has a simple structure, can be manufactured at low cost, and can provide the same high sealing effect as the embodiment shown in FIG.

3 to 7 show variations of the valve stem drive unit of the embodiment described in FIG. 1 in various ways.

The other parts of these modifications except for the valve stem driving section have the same configuration as the embodiment shown in FIG. 1, and the same components are given the same numbers and their explanations will be omitted.

Therefore, the flow path opening/closing operation and the high temperature gas blocking effect of the valve devices of these modified examples are essentially no different from the embodiment described above in FIG. Hereinafter, only the differences between each modification will be described.

In the modified example shown in FIG. 3, a receiving plate 6c is provided at the middle part of the valve stem 6, which contacts the upper surface of the blind lid 9 in the seated position, and is fixed to the receiving plate 6c and the upper surface of the blind lid so as to cover the upper part of the valve stem. A spring 32 is inserted between the casing 31 and the
A lever 33 is pin-coupled to the upper end 6b of the valve stem protruding from the casing, and the intermediate portion of the lever 33 is pivotally supported by a bracket 34 provided on the upper surface of the casing. Therefore, if the lever 33 in the seated position shown in the figure is unclamped and pushed down, the valve stem 6 and valve plate 5 will rise to the lift position shown by the broken line in the figure, and if the lever is clamped in this state, The valve opens. This modification has the advantage that the valve can be opened and closed relatively quickly.

The modified example shown in FIG.
A piston 38 is fixed to the middle part of the
36' and is fitted into a cylinder tube 37 fixed to the blind lid 9. Therefore, if air is supplied from the port 37b at the lower end of the cylinder tube 37 to maintain the pressure, the valve stem 6 and the valve plate 5 are raised and held at the lift position shown by the broken line in the figure, and the valve is opened. However, if air is supplied from the upper end port 37a and the pressure is maintained, the valve will close at the seated position shown. This modification has the advantage that the seating force of the valve plate 5 and the closing force of the closing plate 13 can be increased by air, the sealing effect is enhanced, and the opening and closing operations of the valve can be made quick and reliable.

The modified example shown in FIG.
A rack 42 is formed in the upper half, which is removably covered by a casing 41 fixed to the upper surface of the blind lid 9, and an elevating handle 4 installed horizontally on the casing 41.
A pinion fixed to the rotating shaft 43a of No. 3 is meshed with the rack 42. Therefore, by turning the lift handle 43, the valve stem 6 and valve plate 5 are raised to the lift position shown by the broken line in the figure to open the valve, and by rotating in the opposite direction, the valve is closed as shown in the figure.

The modified example shown in FIG.
A square-shaped stopper 44 is fixed to the upper end, and the screw shaft of the lifting handle 46 is screwed into the screw hole 45a in the upper part of the casing 45, which covers the stopper 44 and is fixed to the upper surface of the blind lid 9. The lower end 46b of the stopper 44 is rotatably connected to the stopper 44. Therefore, by turning the lifting handle 46, the valve stem 6 and valve plate 5 are raised to the lift position shown by the broken line in the figure to open the valve, and by rotating in the opposite direction, the valve is closed as shown in the figure.

The modification shown in FIG. 7 is the same as the valve seat 4 shown in FIG. 6, except that the valve seat 4 in FIG. It has the same configuration as the modified example shown in FIG. In this modification, since the valve seat 4 is inclined so as to approach the stopper 12, the stroke of the valve rod 6 required to open and close the valve is short, and there is an advantage that the flow path can be opened and closed quickly.

Although the present invention has been described above with reference to the illustrated embodiments, it goes without saying that the present invention is not limited to the illustrated embodiments.

<Effects of the invention> As is clear from the above explanation, the high-temperature gas valve device of the present invention has a valve seat provided on the inner periphery of a casing having an inlet and an outlet at both ends, and a heat-resistant packing attached to the valve seat. A valve plate is disposed so as to be able to move toward and away from the valve plate, and the other end of the valve rod, which has one end pivotally connected to the valve plate and protrudes from the wall hole of the casing, is driven to move the valve plate up and down with respect to the valve seat. In the lift position, the gap between the wall hole and the valve stem is closed from the inside via a heat-resistant gasket by a closing plate fixed to the valve stem. The heat-resistant gasket can be brought into close contact with a large amount of force, and the torsional force associated with opening and closing the valve does not act on the heat-resistant gasket, extending the life of the gasket.Furthermore, uneven thermal strain on the valve plate affects the adhesion of the gasket. Since it is unlikely to cause any adverse effects, the flow of high-temperature gas can be interrupted with a high sealing effect, and the simple structure allows the valve device to be made at a lower cost and with improved operability.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the high-temperature gas valve device of the present invention, FIG. 2 is a vertical cross-sectional view showing another embodiment of the present invention, and FIGS. FIG. 8 is a longitudinal cross-sectional view showing various modifications of the valve stem drive unit of the embodiment shown in the figure, and FIG. 8 is a perspective view showing a conventional high-temperature gas valve device using a butterfly valve. DESCRIPTION OF SYMBOLS 1... Casing, 2... Flow path section, 2a... Inlet, 2b... Outlet, 3... Valve stem attachment part, 4... Valve seat, 5... Valve plate, 6... Valve stem, 9... ...Blind lid, 9a
...Central hole, 8...Male thread, 10...Opening/closing handle, 13...Closing plate, 14...Heat-resistant gasket.

Claims (1)

[Scope of utility model registration request] A valve seat provided on the inner periphery of the casing, a valve plate disposed within the casing so as to be able to approach and separate from the valve seat to disconnect communication between the inlet side and the outlet side, and one end pivoted to the valve plate. A valve stem is attached to the wall hole on the outlet side of the casing, and the other end protruding outward from the wall hole on the outlet side of the casing is driven to move up and down with respect to the valve seat. and a closing plate fixed to the valve stem so as to close the gap between the valve stem and the valve stem from inside the casing, and a closing plate provided at a contact portion between the valve seat and the valve plate and a contact portion between the closing plate and the inner surface of the casing, respectively. High-temperature gas valve device with heat-resistant gasket.