JPH0741990B2 - Switching valve for powder and granular material transportation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching valve used for separating and merging powder and granular material transportation lines.

[0002]

2. Description of the Related Art A switching valve of this type is a ball valve, which has a casing having a sheet at the entrance and exit of the granular material and a sheet at the edge thereof, and a passage for the granular material which is housed in the casing in close contact with the sheet. And a ball having
It is known that the seat is made of ceramic, the outer surface of the ball is coated with wear-resistant metal, and the inner surface of the granular material passageway is lined with tile-shaped ceramic.

[0003]

In the above switching valve, it is difficult to secure the sealing property of the seal portion because the seal portion between the seat and the ball is in contact with metal and ceramic. In order to secure the sealing property, it is necessary to improve the processing accuracy of the seat and the ball, which makes the processing cost extremely expensive.

Further, there is a tendency to increase the contact force between the seat and the ball in order to secure the sealing property, and then, when changing the switching position, a large force is required to rotate the ball.

Furthermore, the tile-shaped ceramics are easily peeled off, which shortens the product life.

An object of the present invention is to solve the above problems, to provide a switching valve for transporting powdery or granular material, which has a low processing cost, can change the switching position with a small force, and has a long product life. Especially.

[0007]

A switching valve for transporting granular material according to the present invention comprises a casing having a cylindrical peripheral wall in which two or more granular material inlets and outlets are provided at intervals in the circumferential direction, A rotor having a cylindrical peripheral wall made of an elastic material, which surrounds the hollow portion and is fitted into the casing peripheral wall;
An abrasion resistant pipe for forming a granular material passage, which is open at both ends on the outer surface of the peripheral wall and is capable of communicating with two entrances or two entrances selected from three or more entrances, and a rotor peripheral wall. And a supply means for supplying a pressurized fluid to the hollow portion so as to expand and contract.

[0008]

In the switching valve for transporting the granular material according to the present invention, when pressurized air is supplied to the hollow portion so as to expand the peripheral wall of the rotary body, the inner surface of the case sink peripheral wall and the outer surface of the rotary body peripheral wall are brought into close contact with each other to rotate the casing and the rotary body. The body-to-body sealing property is secured.

When pressurized air is supplied to the hollow portion so as to shrink the peripheral wall of the rotor, the inner surface of the casein peripheral wall and the outer surface of the rotor peripheral wall are released from close contact with each other, so that the rotor can rotate freely.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1> Referring to FIGS. 1 and 2, the switching valve of Embodiment 1 is a three-way valve and is a casing.
11 and a rotating body 13 housed therein and having a hollow portion 12
And a bow-shaped vent pipe 14 provided in the rotating body 13 so as to cross the hollow portion 12.

The casing 11 is composed of a horizontal cylindrical peripheral wall 21 and left and right end walls 22 and 23 closing both ends thereof. Flange 24 is provided at each end of the outer surface of the peripheral wall 21. The end walls 22 and 23 have the same outer diameter as the outer diameter of the flange 24. The flange 24 and the peripheral portions of both end walls 22 and 23 are tightened with bolts and nuts 25. An inlet pipe 26 and two outlet pipes 27 are provided on the circumference passing through the middle of the length of the peripheral wall 21. Inlet pipe 26 and two outlet pipes 27
The angle .theta.1 formed by and is 150 degrees, and the angle .theta.2 formed by the two second outlet pipes 27 is 60 degrees. A ceramic sleeve 28 is tightly fitted on the inner surfaces of the inlet pipe 26 and the two outlet pipes 27.

The rotating body 13 is composed of a horizontal cylindrical peripheral wall 31 fitted in the casing peripheral wall 21 and surrounding the hollow portion 12, and left and right end walls 32 and 33 closing both ends thereof. . The rotor peripheral wall 31 is integrally formed of rubber, has a length substantially equal to the length of the casing peripheral wall 21, and has an outer diameter slightly smaller than the outer diameter of the casing peripheral wall 21. Therefore, the casing peripheral wall 21
There is a slight gap C between the rotor and the peripheral wall 31 of the rotor, which allows the rotor 13 to rotate freely.
Two communication holes 34 are provided on the circumference passing through the middle of the length of the rotary body peripheral wall 31. The angle θ3 formed by the narrower one of the two communication holes 34 is 150 degrees, which is equal to the angle θ1 formed by the inlet pipe 26 and the outlet pipe 27. Steps 35 are provided at both ends of the outer surface of the peripheral wall 31, respectively. The rotor end walls 32, 33 have an outer diameter substantially equal to the inner diameter of the peripheral wall 31 and have flanges at the ends of the outer peripheral surface.
Has 36. End walls 32 and 33 are fitted to both ends of the peripheral wall 31 with the flange 36 abutting on the end surface of the peripheral wall 31.
Then, the hollow portion 12 of the rotating body 13 is sealed by being tightened with a band from above the step portion.

The pipe 14 is made of ceramic and integrally molded. Both ends of the pipe 14 are fitted into the two communication holes 34 and fixed with an adhesive.

At the center of the left end wall 32 of the rotating body 13, a rotating shaft 41
Is cantilevered so as to penetrate the left end wall 22 of the casing 11 and project outward. A pressurized air supply port 42 is provided at the center of the rotary shaft 41.

Powder and granules are sent to the inlet pipe 26 together with the carrier air of MAX 3 kg / cm ² . Pressurized air supply port 42
The air pressure to be supplied to the is preferably higher than the pressure of the carrier air, and is suitably ² to 5 cm ² .

As shown in FIG. 1, one end of the pipe 14 is connected to the inlet pipe 26 and the other end is connected to the outlet pipe 27, and is added to the hollow portion 12 of the rotating body 13 through the pressurized air supply port 42. When the pressurized air is supplied, the peripheral wall 31 of the rotating body 13 is expanded, and the outer surface of the rotating body peripheral wall 31 is brought into close contact with the inner surface of the casing peripheral wall 21, whereby the edge portion of the communication hole 34 is sealed and the casing is formed. There is no risk of leakage of powder particles transported between the peripheral wall 21 and the rotary body peripheral wall 31.

From the state shown in FIG. 1, when the supply of the pressurized air is stopped and the peripheral wall 31 of the rotary body is contracted, the rotary body 13 can be freely rotated. In this way, when the rotating body 13 is rotated by 150 degrees clockwise in FIG. 1 through the rotating shaft 41 by means not shown, the inlet pipe 26 is brought into communication with the other outlet pipe 27 as shown in FIG. To be

Further, from the state shown in FIG.
When rotated about 0 degrees clockwise, as shown in FIG.
The inlet pipe 26 is not communicated with any of the outlet pipes 27, and is closed by the rotating body peripheral wall 31.

FIG. 5 shows a modification of the pipe.
Although the pipe of the above-mentioned embodiment is integrally formed of ceramic, the pipe 51 according to this modification has a large number of short cylindrical ceramic sleeves 52 arranged so as to be continuous and continuous. R. It is hardened with the P layer 53. According to this modification, it is easy to manufacture a plurality of types of pipes having different vent angles.

FIG. 6 shows a modification of the rotating body.
In this modification, inwardly projecting flanges 61 are provided at the edges of the communication holes 34 of the rotary body peripheral wall 31, and the pipes 14 fitted into the communication holes 34 through the flanges 61 are tightened with a band 62 from above the flanges 61. As a result, the end of the pipe 14 is fixed to the rotating body 13.

Second Embodiment Referring to FIGS. 7 and 8, the switching valve of the second embodiment is a two-way valve, and like the first embodiment, includes a casing 71 and a rotor 72. The number of inlet pipes 73 is one, but the number of outlet pipes 74 is one. The pipe 75 is straight. 7 shows the switching valve in the ON state, and FIG. 8 shows the switching valve in the OFF state.

[0023]

According to the present invention, when pressurized air is supplied to the hollow portion so as to expand the peripheral wall of the rotary body, the inner surface of the casein peripheral wall and the outer surface of the rotary body peripheral wall are brought into close contact with each other, and the seal between the casing and the rotary body is made. Since it is necessary to improve the processing accuracy of the casing and the rotating body, the processing cost is low.

When pressurized air is supplied to the hollow portion so as to contract the peripheral wall of the rotor, the inner surface of the casein peripheral wall and the outer surface of the rotor peripheral wall are released from close contact with each other, so that the rotor can freely rotate. No significant force is required to rotate the rotating body when changing the.

Further, since tile-shaped ceramics and the like are not used, there is no fear of peeling of the ceramics and the product life is extended.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a switching valve according to the present invention.

FIG. 2 is a vertical cross-sectional view of the switching valve.

FIG. 3 is a sectional view corresponding to FIG. 1, showing a switching operation of the switching valve.

FIG. 4 is a sectional view corresponding to FIG. 1, showing another switching operation of the switching valve.

FIG. 5 is a perspective view showing a modified example of the pipe of the switching valve.

FIG. 6 is a cross-sectional view corresponding to FIG. 1 showing a modified example of the rotating body of the switching valve.

FIG. 7 is a cross-sectional view of a switching valve according to another embodiment of the present invention.

FIG. 8 is an explanatory diagram of a switching operation of a switching valve according to another embodiment.

[Explanation of symbols]

 11 Casing 12 Hollow part 13 Rotating body 14 Pipe 21 Casing peripheral wall 26 Inlet pipe 27 Outlet pipe 31 Rotating body peripheral wall 73 Inlet pipe 74 Outlet pipe

Claims (1)

[Claims] 1. Inlet / outlet ports 26, 27 of two or more,
A cylindrical peripheral wall in which 73 and 74 are provided at intervals in the circumferential direction.
A rotary body 13 having a casing 11 having a hollow portion 12 and a cylindrical peripheral wall 31 made of an elastic material, which surrounds the hollow portion 12 and is fitted into the casing peripheral wall 21, and the rotary body 13 has both ends opened on the outer surface of the peripheral wall 31. Let and 2
Inlet / outlet ports 73, 74 or two or more selected inlet / outlet ports 26, 27 of the three or more inlet / outlet ports 26, 27, which are provided so as to communicate with each other. A switching valve for transportation of powder and granules, comprising: a supply means (42) for supplying a pressurized fluid to the hollow portion (12) so as to expand and contract.