JPS6118641A - Powdery material feeding apparatus - Google Patents

Abstract

PURPOSE:To prevent the breakage of a rotary valve and a pad due to the biting- in for powdery material by installing a cylindrical part in concentric form at the both edge parts in the center direction of the rotary valve and covering the rotary valve by a cylindrical ring pad whose revolution for a casing is suppressed. CONSTITUTION:When a rotor 30 (rotary valve) is revolved in the X1 direction by a rotary shaft 31, the rotor 30 revolves with the cylindrical part 51 of a disc- shaped end plate 50 installed onto the both edges of a blade 32 extending in the direction of the center line, in a ring pad 23 whose revolution for a casing 1 is suppressed. When powder material is supplied from a feeding port 10, said powder material passes through a cylindrical member 12 and is charged by a certain amount successively into the pocket of the rotor 30. The powder material is discharged through a discharge port by the gravity when the pocket is opened downwardly from an exit 66. When the powdery material clogs the part between the rotor 30 and the ring pad 23, said pad 23 is set eccentric and the interval is spread, and therefore, the strain of the blade 32 and the destruction of the pad 23 due to the biting-in for powder material can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a supply device for uniformly supplying a constant amount of powder or granular material regardless of the differential pressure between the upper and lower sides of the supply device.

(Prior Art) A rotary valve is used, for example, to meter powder and granular materials to or from a storage tank using a ventilation line, or to discharge the powder from a storage tank to a ventilation line. A typical rotary valve is designed to prevent contact between the rotary valve and the casing by providing an appropriate gap between the rotary valve, the casing, and the guide wall depending on the particle size of the powder or granular material to be handled.

However, with conventional rotary valves, the above-mentioned gap must be made larger than necessary, which causes problems such as reduced supply accuracy and gas blow-through, which affects the differential pressure between the top and bottom of the supply device, causing powder A sufficient effect has not been achieved in uniformly supplying a certain amount of granules.

Therefore, as an improvement to solve the above-mentioned problems, Japanese Patent Laid-Open No. 58-52121 has already been proposed. In this configuration, in order to prevent contact between the rotary valve and the inside of the casing, a pad is provided between the supply port and the rotary valve, and the space between the pad and the rotary valve is filled with pressurized gas. However, in this configuration, the pad is only provided at the part corresponding to the upper end of the rotary valve, and as a result, it is necessary to provide a dedicated mechanism to absorb the hesing, yawing, and rolling of the pad, and the configuration is difficult. Not only is this complicated and expensive, but it also has defects that can cause failures.

(Objectives of the Invention) (a) Particles do not enter between the rotary valve and the pad, making the rotation of the rotary valve smooth.

(g)) Even if powder or granular material were to enter between the rotary valve and the pad, the impact force should not be generated too much.

(0) Eliminates the need for a special mechanism to absorb pitching, yawing, and rolling of the pad, thereby simplifying the configuration, reducing noise, and improving durability.

(Structure of the Invention) A rotary valve having a horizontal rotation center is arranged in a casing having an upper supply port and a lower discharge port; a plurality of pockets having openings on the outer circumferential side are provided in the rotary valve; In a powder and granular material feeding device that fills a fixed amount of powder and granular material supplied from a supply port into each pocket of a rotary valve and discharges the powder and granular material toward a discharge port by rotating the valve; This is a powder and granular material feeding device that has the following essential requirements.

(a,) Concentric cylindrical portions are provided at both ends in the centerline direction of the rotary valve.

(To) Cover the rotary valve including the cylindrical part with a substantially cylindrical ring pad that is prevented from rotating relative to the casing.

(0)! An inlet corresponding to the above-mentioned supply port is provided at the upper part of the I-son good, and an outlet corresponding to the above-mentioned discharge port is provided at the lower part of the ring pad.

(F) A ventilation passage for sending pressurized air between the cylindrical portion and the ring pad is provided in the ring pad.

(Example) In FIG. 1, a casing body 2 constituting a casing 1 has a discharge port 3 formed by a vertical hole at its lower end, and the upper end opening has a horizontal flat upper cover 4 with a gasket. It is closed airtightly by being fixed with bolts 6 through 5. A loading member 9 is fixed to the center of the cover 4 via a gasket 7 through a set port 8. The member 9 is provided with an input port 10 (supply port) formed by a vertical hole.
The upper part of 0 is formed into a tapered shape that opens upward.

The lower part of the member 9 fits into a hole 11 formed in the center of the cover 4 at intervals, and the lower end of the member 9 has an inlet guide member 12 that projects downward into the casing 1. It is welded.

In order to hide the inner surface of the casing 1 and the input port, a flexible joint 21 with sealing flanges at both ends is provided between the hole 11 of the cover 4 and the pad 23, and a sheet backing 22 is sandwiched between the upper and lower flange surfaces. It is fixed by a set port 24, and the ring pad 23 is slidably fitted to the rotor 30 without being fixed to the outside. The ring pad 23 is a substantially cylindrical member having a centerline in the horizontal direction, and has a mounting base portion 26 connected to the set port 24 at the upper end thereof, and a mounting base portion 26 for fitting the cylindrical member 12 in the center of the base portion 26. It has an inlet 27 for opening.

A substantially concentric rotor 30 (rotary valve) is rotatably fitted into the pad 23 . The rotor 30 has a central rotating shaft 31
A large number of blades 32 are fixed radially and are rotatably supported by the casing 1. In addition, disk-shaped end plates 50 in the rotor radial direction are provided at both ends of the blades 320 extending in the direction of the center line 0□-0□ of the rotor 30. A cylindrical portion 51 projecting to the side is fixed concentrically.

A portion 23a of the ring pad 23 corresponding to the outer peripheral side of the cylindrical portion 51 is formed thickly in an annular shape, and is fitted into the cylindrical portion 51 through a very small gap that cannot be shown in the drawings. A ring groove 52 (part of the ventilation passage) is provided in the portion 28a.
is formed. In addition, a large number of radial nozzles (part of the ventilation passage) are formed in the portion 23a at equal intervals in the circumferential direction, and the inner circumferential end is formed narrowly so that the portion 2
It opens into a slight gap between 8a and the cylindrical portion 51.

As shown in detail in FIG. 3, on the inner circumferential surface of the portion 23a, near the opening of the nozzle/L' 56, there is an arcuate surface where the opening portion is deepest and becomes gradually shallower as it moves away from the portion 23a in the circumferential direction. A shaped groove 58 is formed, and as shown in FIG. 4, the groove 58 is formed in a long band shape in the circumferential direction of the portion 23a. The ring grooves 52 provided at both ends of the blade 32 shown in FIG. .

Note that a recess with a rectangular cross section formed between each blade 32 of the rotor 30 is a pocket 65, and an outlet 66 located above the discharge port 3 is formed in a portion of the ring pad 23 corresponding to the lower end of the rotor 30. has been done.

Next, the operation will be explained. Processing air supply mechanism (not shown)
When processing air is supplied from the air port 63, the air passes through the tube 62, reaches the ring groove 52 and each nozzle/V56, and is ejected toward the inner peripheral side of the portion 23a. Since the air is ejected from the nozzle 56 over the entire circumference of the ring pad 23, a thin layer of air is formed between the inner circumferential surface of the portion 28a and the outer circumferential surface of the cylindrical portion 51, and the ring pad 23 is held in a slightly floating position with respect to the rotor 80. At this time, the ring pad 28 is automatically aligned by applying air over its entire circumference and becomes approximately concentric with the rotor 30.

When the rotor 30 is rotated in the X direction by driving the rotating shaft 31 by a drive mechanism (not shown), the rotor 30 rotates inside the ring pad 23 together with the cylindrical portion 51, but the X air between the portions 23a and 51 is further increased. As a result, the rotor 30 and the ring pad 23 are held substantially concentrically with a slight gap between them, and no metal friction occurs between the rotor 30 and the pad 23.

When the powder or granule is supplied from the input port 10, the powder passes through the cylindrical member 12, is cut into a certain amount, is scooped and filled into the pocket 65 of the rotor 30, and the pocket 65 is opened downward from the outlet 66. When this occurs, it is discharged by gravity through the discharge port 3. The ring pad 23 is in a floating state with respect to the rotor 30 via a thin layer of air, and is only connected to the sweet potato inlet by a flexible joint. ring pad 23
Even if the powder or granules are caught inside the rotor 3,
Pad 2 so as to widen the gap between 0 and ring pad 23.
3 is eccentric. As a result, the braking caused by the biting of powder and granules
The conventional problems such as distortion of the pad 32 and destruction of the pad 23 do not occur.

When the part where the powder and granules are sandwiched between the rotor 30 and the pad 23 reaches the outlet 66 and the powder and granules are discharged, the ring pad 23 is ejected over the entire circumference (air self-centering effect). It is automatically returned to a position concentric with the rotor 30.

Note that the pad 23, the portion 28a, and the cylindrical portion 5 of the rotor 30
Since pressurized air is constantly ejected during the first period, powder and granules do not get caught, and the rotor 30 always rotates smoothly.

(Effect of the invention) A concentric cylindrical portion 51 is provided at both ends in the direction of the center line o1-01 of the rotary valve (rotor 30); Covered with a shaped link pad 23; an inlet 27 corresponding to the supply inlet (inlet 10) is provided at the upper part of the ring pad 23, and an outlet 66 corresponding to the outlet 3 is provided at the lower part of the ring pad 23; 51 and the ring pad 23) are provided in the link pad, so that: (a) Particles do not enter between the cylindrical portion 51 and the pad 23. Therefore, the rotation of the rotary valve is always smooth.

(G) Even if powder or granular material gets between the rotary valve and the pad 23,
Since the pad 23 is automatically eccentric, the rotary valve and the pad 2
The impact that 3 receives is alleviated.

(C) Since the pad 23 is automatically aligned with the rotary valve while being in a floating state by the processing air, the pad 23
A special mechanism for absorbing the pitching, yawing, and rolling described in No. 3 is not required, and the structure can be simplified, the number of failure points can be reduced, and costs can be reduced and durability improved.

(Another Embodiment) The outlet 66 is not limited to opening only at the lower part of the ring pad 23, and may be opened even larger. For example, the outlet 66 may be widened to the vicinity of the mounting base 26.

You can also do it.

[Brief explanation of drawings]

Claims (1)

[Claims] A rotary valve having a horizontal rotation center is disposed in a casing having an upper supply port and a lower discharge port; the rotary valve is provided with a plurality of pockets having openings on the outer circumferential side; and by rotating the rotary valve, In a powder and granular material supply device that fills a fixed amount of powder and granular material supplied from a supply port into each pocket of a rotary valve and discharges it toward a discharge port; both ends in the direction of the center line of the rotary valve. with concentric cylindrical parts;
The rotary valve including the cylindrical portion is covered with a substantially cylindrical ring pad that is prevented from rotating with respect to the casing; the upper part of the ring pad has an inlet corresponding to the above-mentioned supply port, and the lower part of the ring pad has an inlet corresponding to the above-mentioned outlet. A powder supply device characterized in that a corresponding outlet is provided, and a blow passage for sending pressurized air between the cylindrical portion and the ring pad is provided in the ring pad.