JPH028134Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a valve device, and particularly to a valve device for controlling the flow of powder or granular material.

[Conventional technology]

When transporting granular materials such as coal, sand, ash, grain, etc. through a pipe, it is necessary to use a valve device in this pipe to intermittent the flow of the granular material and adjust its flow rate. Become.

A device for controlling the flow of powder and granular material is a valve housing having an inlet and an outlet for powder and granular material, and a valve housing having an inlet and an outlet for the powder and granular material, and a valve housing that is in contact with the opening edge of the inlet on the downstream side in the flow direction of the powder and granular material. BACKGROUND OF THE INVENTION Valve devices are known that include a valve body that moves to open and close an inlet.

However, in such a valve device,
Pressurized gas is often introduced into the valve housing in order to transport powder and granules with pressurized gas.
It is known that a valve housing is provided with a seal portion at a portion of the valve housing that makes sliding contact with the valve body. (For example, JP-A-55-
109856, special table 57-501575. ) This known seal part is provided with a recessed part in a sliding contact area with the valve body of the valve housing so as to go around the inlet, and an annular elastic ring is mounted in this recessed part. This elastic ring bulges out due to the pressurized gas introduced to its back surface and comes into close contact with the valve body surface, and when this air pressure is released, it contracts and retracts into the recess and separates from the valve body surface. .

[Problem that the invention attempts to solve]

However, in conventional seals, the elastic seal ring is repeatedly subjected to large deformations by expanding and contracting with pressurized air, and therefore tends to deteriorate quickly.

In addition, there was also the risk that particles would become trapped between the seal ring and the surface of the valve body, thereby reducing sealing performance and causing gas to leak from within the valve housing.

[Means for solving problems]

In order to solve the above problems, the present invention provides a valve device in which a valve body is provided in a valve housing having an inlet so as to be in sliding contact with the opening edge of the inlet on the downstream side in the fluid flow direction. As a seal part installed at the sliding contact area between the valve housing and the valve body, it moves by being urged by pressurized fluid from the back and comes into close contact with the surface of the valve body, and after the fluid pressure is released, the seal ring returns to its original position. A sealing ring is provided which is separated from the valve body by a member. Further, in the present invention, communication holes for introducing fluid are provided in order to eject fluid from both side portions of the seal ring and remove powder particles.
In addition, in the present invention, along both sides of the recess,
A ring-shaped crush ring is installed that goes around the inlet, and the crush ring is configured to:
The distance between the valve body facing surface and the valve body surface gradually increases as the distance from the recessed portion increases.

[Effect]

The seal ring provided in the seal part of the valve housing is moved in the direction toward and away from the valve body by the pressing force of the fluid and the return force of the seal ring return member, and during this movement, it deforms itself. There are almost no Therefore, unlike conventional examples, expansion and
Since there is no deformation due to repeated contraction, it is hard to deteriorate and has excellent durability. Further, since fluid such as air or water is ejected from both sides of the seal ring, powder particles that have adhered to or are about to adhere to the seal ring are blown away or washed away. As a result, the sliding surface of the seal ring with the valve body becomes clean, and good sealing is always performed.

Further, the crush ring is shaped such that the distance between its lower surface and the valve body gradually increases as the distance from the concave portion increases. Therefore, when the valve body moves to open and close the inlet, the powder is caught between the top surface of the valve body and the bottom surface of the crushing ring, and is finely pulverized by the crushing action. The area between the edge on the recessed side and the valve body is subjected to shearing action. Therefore, the particle size of the powder passing between the crush ring and the valve body is extremely small, and therefore, it is easily destroyed by the gas ejected from the fluid ejection communication hole through the communication hole. blown away.

〔Example〕

Examples will be described below with reference to the drawings.

1 and 2 are sectional views of a valve device according to a first embodiment of the present invention, and FIG. 2 shows a sectional view taken along the line of FIG. 1. Further, FIG. 3 shows an enlarged cross section of the seal portion.

First, the overall configuration of a valve device according to this embodiment will be described with reference to FIGS. 1 and 2.

In FIGS. 1 and 2, 10 indicates a valve device, the upper part of which has a hopper 12 for supplying powder and granules, and the lower part thereof a pipe 14 for transporting powder and granules. It is connected. The valve device 10 mainly includes a valve housing 16 and a valve body 18 installed within the valve housing 16.

The valve housing 16 consists of a lid part 16a and a cylindrical body part 16b, and an inlet 20 for powder and granular material is provided in the center of the lid part 16a. The lower peripheral edge of the inlet is curved into a spherical shape and serves as a sliding surface 22 with the valve body 18 . A lower opening of the valve housing 16 serves as an outlet 24 . Inflow port 20
A short cylindrical connecting portion 26 is integrally provided at the portion so as to extend upward, and a flange 26f is formed at the upper end of the connecting portion 26. And the hopper 12
The flange 12f provided on the flange 12f and this flange 26
f are connected by bolts and nuts, thereby attaching the hopper 12 to the valve housing 16. Also, valve housing 1
A flange 16f is provided at the lower end of the pipe 1.
A flange 14f is formed at the upper end of the flange 4 and connected by bolts and nuts, thereby solidifying the piping 14 and the valve device 10.

The structure of the valve body 18 will be explained next.

This valve body 18 is connected to the sliding surface 2 of the valve housing.
2, and a leg portion 3 integrally provided at the bottom of the curved portion 30.
2,34. The legs 32 and 34 include
The rotating shafts 36 and 38 are connected to each other, and these rotating shafts 36 and 38 are connected to the valve housing 16.
The support housings 40 and 42 are inserted into support housings 40 and 42, and are pivotally supported via bearings 44 and 46. Note that 48 and 50 are bearings 44 and 46
This is a sealing member installed on the inner side of the valve housing to prevent leakage of pressurized gas in the valve device 10 or intrusion of powder or granules into the bearings 44, 46. Note that the rotating shafts 40, 42
The axes of the valve body 18 are arranged on a straight line, and this straight line (axis line) passes through the center of the spherical surface formed by the sliding surface 22 and the upper surface of the valve body 18. Therefore, by rotating the rotating shafts 36 and 38, the valve body 18
can rotate in contact with the spherically curved sliding surface 22.

Further, a motor 54 is attached to the outside of the support housing 42 provided in the valve housing 16 via a motor mounting housing 52, and the outer tip of the rotating shaft 38 is connected to the output shaft of the motor 54. 54 drives the valve body 1.
8 rotates.

The structure of the seal portion 56 formed on the sliding surface 22 will now be described with reference to FIG. 3.

Reference numeral 58 denotes an annular recess formed in the valve housing 16 for installing a seal portion, and is provided so as to go around the inlet 20. 60
is a first ring fitted into this annular recess 58;
Reference numeral 62 denotes a second ring further fitted inside the first ring 60, each having a U-shaped cross section, and a seal ring 64 described below is fitted inside the second ring 62. recess 63 for mounting
It is said that

A seal ring 64 made of hard fluororesin or the like is attached to the inlet portion of the second ring 62 so as to be movable in the vertical direction in the figure, and a seal ring return member (in this embodiment, a tension coil spring) 66 is connected to the ceiling surface of the second ring 62 (bottom surface of the recess 63). That is, the coil spring 6
The upper and lower ends of the ring 6 are fixed to the ceiling surface of the second ring 62 and the upper end surface of the seal ring 64, respectively. In the illustrated state, no external force is substantially applied to the coil spring 66, and in this state, the seal ring 64 is located away from the valve body 18.

A first communication hole 68 that communicates the lower end surface of the first ring 60 with the outside of the valve housing 16 is bored in the first ring 60 and the valve housing 16 . On the other hand, the second ring 62
A second communication hole 72 for communicating the space surrounded by the seal ring 64 and the seal ring 64 with the outside of the valve housing 16 is connected to the second ring 62 and the first ring 6.
0 and the valve housing 16. The communication holes 68 and 72 are each connected to an appropriate pressurized gas supply device (for example, an air compressor), although not shown.

First and second crush rings 72 and 74 are disposed on both sides of the first ring 60. Each of the clutch rings 72 and 74 has a shape in which the distance between the lower surface thereof and the valve body 18 gradually increases as the distance from the recess 63 increases.

In the seal portion configured in this manner, when pressurized gas is introduced into the recess 63 surrounded by the second ring 62 and the seal ring 64 through the communication hole 72, the seal ring 64 is moved by the pressurized gas. The valve body 18 is biased to move downward in the figure and is pressed against the surface of the valve body 18, thereby performing a sealing action. Furthermore, by jetting pressurized gas from the lower end surface of the first ring 60 through the communication hole 68, it is possible to blow off the powder present in the vicinity of the lower end surface.

In addition, the seal ring 64 is attached to the valve body 18 as shown in the figure.
By positioning the seal ring 6 in a state away from the
Particles that have adhered or are about to adhere to the abutting surface of the valve element 4 or the abutting surface of the seal ring 64 of the valve element 18 are blown away, and the abutting surface of the seal ring 64 and the valve element 18 is blown away. clean.

First and second crushing rings 74, 76
The distance between the lower surface of the valve body 18 and the recess 6
It has a shape that gradually becomes larger as it moves away from 3. Therefore, when the valve body 18 moves in the left-right direction in the figure as shown by the arrow a to open and close the inlet 20, there is a gap between the upper surface of the valve body 18 and the lower surface of the first or second crushing ring 74, 76. The powder and granules are bitten and finely crushed by the crushing action, and the first or second crushing rings 74, 76
The portion between the edge portion on the side of the concave portion 63 and the valve body 18 receives a shearing action. Therefore, the powder passing between the first or second crushing rings 74, 76 and the valve body 18 has an extremely small particle size, and therefore passes through the communication hole 68 to the first crushing ring 74, 76 and the valve body 18. It is easily blown away by the gas ejected from the lower end surface of the ring 60.

Figure 4 shows the crushing rings 74, 7 in Figure 3.
6 is a bottom view showing the surface facing the valve body 18 of No. 6; FIG. As shown in the figure, if a groove 77 is provided on the lower surface of the crushing rings 74, 76, the crushing rings 74,
The pulverizing action of the powder caught between 76 and the upper surface of the valve body 18 is enhanced. The powder whose particle size has further become smaller due to this pulverization action is transported to the communication hole 68.
It can be easily blown away by the gas ejected from it. Further, if the groove 77 is formed into an arc shape as shown in the figure, powder particles caught in the groove can be easily removed by sliding with the valve body.

FIG. 5 is a sectional view of the seal portion of the valve device according to the second embodiment of the present invention. In this embodiment, a hydraulic cylinder mechanism is employed as a mechanism for moving the seal ring 64 in the direction toward and away from the valve body 18. That is, a piston member 64b is integrally provided on the side of the seal ring 64 opposite to the valve body 18 via a connecting portion 64a, and this piston member 64b is slidably fitted into the recess 63. There is. (Note that the second ring 62 is not used in this embodiment.) A hydraulic device (not shown) is connected to the second communication hole 72.

Incidentally, engagement grooves 64c, 64d are formed in both side surfaces of the seal ring 64, and the edges of the stoppers 82, 84 are engaged with the engagement grooves 64c, 64d. That is, the ends of the first and second crushing rings 74 and 76 on the concave portion 63 side are formed with stepped portions 86 and 88 as if cut out.
Ring-shaped stoppers 82 and 84 surrounding the inlet 20 are fixed to the ceiling portions 6 and 88, respectively, with bolts. The width of the stoppers 82, 84 is greater than the width of the steps 86, 88, and therefore,
The inner peripheral side of the stopper 82 and the outer peripheral side of the stopper 84 are engaged with the engagement grooves 64c and 64d. The engagement between the engagement grooves 64c and 64d and the stoppers 82 and 84 limits the range of movement of the seal ring 64.

In the illustrated state, the oil pressure in the recess 63 is reduced through the second communication hole 72 and the seal ring 6 is removed.
4 is pushed up and separated from the valve body 18. At this time, the lower parts of the engagement grooves 64c and 64d are
The seal ring 64 comes into contact with the lower end surfaces of the stoppers 82 and 84 to prevent the seal ring 64 from entering the recess any further.

In this state shown in FIG. 5, the second communication hole 72
Hydraulic pressure is supplied into the recess 63 from the piston member 6.
When hydraulic pressure is applied to the upper surface of the seal ring 6
4 is pushed down and pressed against the valve body 18.

In the embodiment shown in FIG. 5, the first communication hole 68 also passes through the stoppers 82 and 84, and the recess 63
It is said that air can be blown out from both sides.
The rest of the configuration in FIG. 5 is similar to the embodiment in FIG. 3.

In addition, in the embodiments shown in FIGS. 5 and 6, the second
Water pressure may be supplied from the communication hole 72 of the sixth
In the illustrated embodiment, air pressure may be introduced.

FIG. 6 is a sectional view of the seal portion of the valve device according to the third embodiment of the present invention. In this seal portion, an electromagnet and an iron piece are employed as a seal ring return member for pulling the seal ring 64 into the recess 63. That is, an electromagnet 90 is attached to the ceiling part of the first ring 60,
An iron piece 64e is fixed to the upper end of the connecting member 64a of the seal ring 60 so as to face this.

Also in the embodiment shown in FIG. 6, the second communication hole 72 is connected to the valve housing 16 and the first ring 6.
0, and the seal ring 64 moves downward in the figure and is pressed against the valve body 18 by the action of the oil pressure introduced from this second communication hole. (In addition,
As shown in FIG. 3, pressurized gas may be used. ) Also, when this hydraulic pressure is stopped and the electromagnet 90 is energized, the iron piece 64e is moved to the electromagnet 9.
0, the seal ring 64 moves upward in the figure and is separated from the valve body 18.

The rest of the structure of the embodiment shown in FIG. 6 is the same as that of the embodiment shown in FIG. 5, and its working mechanism is also the same, so the same members are given the same reference numerals and their explanations will be omitted.

7 and 8 are cross-sectional views of a valve device according to another embodiment of the present invention. These embodiments relate to a type of valve device, also called a horizontal type, which is installed at a location where powder or granular material flows horizontally or in an oblique direction close to horizontally.

In FIGS. 7 and 8, pipes 14 arranged horizontally are connected to the inlet and outlet sides of the powder and granule material of the valve housing 16, respectively, and the granule material is transported as shown by arrow Y in the figure. flows from left to right.

In the embodiment shown in FIG. 7, the bottom 16c of the inner surface of the valve housing 16 is horizontal, and in the embodiment shown in FIG. are doing.

With this configuration, it is possible to prevent powder from accumulating in the valve housing 16. That is, in the conventional horizontal type valve device, the bottom portion 16c also had an outwardly bulging portion like the ceiling side 16d. Particles passing through the valve housing tend to accumulate and accumulate in this outwardly bulging part, and powders such as moist pulverized coal tend to harden when they accumulate, preventing smooth flow inside the valve housing. In some cases, this resulted in blockage of the valve.

If the bottom 16c in the valve housing 16 is horizontal or slopes downward when the valve device is installed, as in the embodiments shown in FIGS. 7 and 8, such accumulation and storage of powder and granules This phenomenon can be avoided and smooth flow can be ensured at all times.

In the embodiments shown in FIGS. 7 and 8, the configurations of other parts are substantially the same as those of the embodiments described above. Furthermore, the seal portion 56 may have any of the configurations shown in FIG. 3, FIG. 5, and FIG. 6.

In the description of each of the above embodiments, air is ejected from the first communication hole 68, but in the present invention, a gas other than air or a liquid such as water may be ejected.

FIG. 9 is a perspective view of a valve body used in a valve device according to still another embodiment of the present invention. In this embodiment, a plurality of V-shaped uneven portions 92 are formed on the front edge of the curved portion 32 of the valve body 18 (i.e., the leading edge of the portion that crosses the inlet 20 when the valve body operates to close the inlet). It has been established. By providing the plurality of V-shaped uneven portions 92 on the front edge of the valve body in this way, when the valve body rotates, it moves forward as if passing through the powder and granules, so the force required to rotate the valve body is reduced. is small and sufficient. In addition, due to this scraping action, the powder that hits the front edge of the valve body easily moves and separates from the front edge, so that the powder that is caught between the front edge of the valve body and the edge of the inlet 20 The number of grains decreases. For this reason, the resistance that the front edge of the valve body 18 receives when entering the edge of the inlet 20 is reduced, so that only a small amount of force is required to operate the valve. Note that this uneven portion 92
10 is a cross-sectional view taken along the line XI-XI in FIG.
As shown in the figure, if the valve body can rotate in either direction due to forward and reverse rotation of the motor 24,
They may be provided on both sides of the valve body 18 as shown in FIG.

〔effect〕

As described in detail above, according to the valve device of the present invention, the sealing characteristics of the seal section installed between the inlet periphery of the valve housing and the valve body are significantly improved, and the sealing characteristics of the seal section are significantly improved. Durability is also dramatically improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the valve device of the present invention, Fig. 2 is a sectional view taken along the line of Fig. 1, Fig. 3 is an enlarged view of the main parts of Figs. The figure is a bottom view of the crush ring, FIGS. 5 and 6 are views showing the cross-sectional structure of the seal portion of the valve device according to the second and third embodiments, and FIGS. 7 and 8
The figures are cross-sectional views of valve devices according to the fourth and fifth embodiments, respectively, FIG. 9 is a perspective view of a valve body used in a further different embodiment, and FIG. 10 is XI-XI of FIG. 9.
It is a sectional view along a line. 10...Valve device, 12...Hopper, 14...
... Piping, 16 ... Valve housing, 18 ... Valve body, 20 ... Inflow port, 24 ... Outlet port, 36, 3
8... Rotating shaft, 44, 46... Bearing, 54
... Motor, 60 ... First ring, 62 ... Second ring, 63 ... Recess, 64 ... Seal ring, 66 ... Coil spring, 68 ... First communication hole, 72 ... No. 2 communication hole, 74...first crushing ring, 76...second crushing ring.

Claims (1)

[Claims for Utility Model Registration] A valve device for controlling the flow of powder or granular material,
A valve housing having an inlet and an outlet for powder and granular material, a valve body for opening and closing the inlet that slides in contact with the opening edge of the inlet on the downstream side in the flow direction of the powder and granular material, and a periphery of the inlet opening of the valve housing. In a valve device having a seal portion provided at a sliding contact portion of the valve body, the seal portion includes a recess surrounding the inlet, and a recess that is fitted into the recess so as to be movable in a direction toward and away from the valve body. and a seal ring return member interposed between the seal ring and the bottom surface of the recess for returning and holding the seal ring at a position separated from the valve body by a predetermined distance, and a communication hole for extruding a seal ring that communicates between the inside of the recess and the outside of the valve housing, and a communication hole for fluid ejection that communicates both side portions of the recess with the outside of the valve housing, along both sides of the recess, A ring-shaped crush ring is installed around the inlet, and the crush ring has a shape in which the distance between the valve body facing surface and the valve body surface gradually increases as the distance from the concave portion increases. A valve device characterized by: