JP3354643B2 - Rotary valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve for continuously transferring a powdery or granular material of food, a solid such as wood chips, a raw material of food or the like, a mixture of liquid and gas, etc., to a portion having a different pressure continuously. Things.

[0002]

2. Description of the Related Art In the field of food, paper pulp and the like, a rotary valve has been generally used as a device for continuously supplying a powdery or granular material. FIG. 4 shows an example of the basic structure. The raw material supplied from the upper inlet A is dropped into the space 6 partitioned by the pocket wall 13, and the airtightness of each space 6 is pressed while pressing the vane 2 against the inner periphery of the casing 1. While maintaining the properties, the liquid is supplied to the lower discharge port B sequentially and continuously by rotation of the shaft.

[0003]

In a rotary valve for transferring powders and granules, vanes 2 are used to separate spaces 6, 6 in the valve so as to minimize gas leakage before and after the valve. As shown in FIG. 2, the vane 2 is constantly pressed against the casing 1 by an elastic body such as rubber 8 provided at the bottom of the vane groove 9 to maintain the sealing property between the left and right spaces 6-1 and 6-2. are doing. Although a small clearance is provided between the vane 2 and the vane groove 9 in order to keep the followability of the vane 2, in the prior art, the fine powder of the raw material enters the clearance portion and is fixed during operation. As a result, the movement of the vane 2 is deteriorated, thereby impairing the sealing performance, or the gas entering the back space of the vane groove 9 on the high pressure side is difficult to escape. The pressure acts in the direction of the liner to promote wear of the vane 2 and the liner 14,
There is a risk of damaging the.

A precompression chamber (10 in FIG. 3) is provided outside the side wall of the space 6 so as to prevent gas in the system from leaking to the outside. In some cases, the gas flows into the back of the vane groove 9 through the gap between the seals, and the pressure in this portion is increased. The present invention prevents the intrusion of the raw material between the vane groove and the vane, which may have occurred conventionally, and also prevents the abnormal pressure rise of the back pressure of the vane groove, while maintaining the followability of the vane. It is an object of the present invention to provide a rotary valve that prevents a vane from being worn or damaged.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention comprises a plurality of vanes radially formed on the outer periphery of a rotor shaft to form a plurality of rotating spaces, the vanes being disposed at the bottom of the vane groove. In a rotary valve which is slidably supported on an inner peripheral surface of a casing by an elastic body and continuously discharges a raw material supplied from an inlet to an outlet having a pressure different from that of the inlet, an outer side of a side wall disc partitioning a side portion of the space. And a small air hole penetrating between the pressure chamber and the vane groove, and a small air hole penetrating between the vane groove and the space portion. These are used as means for solving the problem.

[0006]

The conductance of the fluid passing holes of the working vane sidewalls disk, if sufficiently smaller than that of the flow hole to the space from the vane back can vanes Mizoura圧P _M slightly larger than that space pressure P _C. Therefore, the differential pressure between the back of the vane and the outside of the vane can always be sufficiently reduced, and the abnormal increase in the pressing load of the vane due to the pressure difference can be prevented. Also, since the back pressure of the vane is always kept slightly higher than the pressure in the space, there is always gas flow from the back of the vane to the outside of the vane at the clearance between the vane and the vane groove. The penetration of the raw material fine powder can be greatly reduced.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the present invention; FIG. First, in FIG. 1, the raw material is transferred from the inlet A to the outlet B.
In this embodiment, the pressure in the preload chamber 10 is 16 kg / cm ² , the side A is 16 kg / cm ² , and the side B is the atmosphere (1 kg / cm ² ). Further, a small gas flow hole 12 shown in FIG. 3 is provided between the preload chamber 10 and the back side of each vane 2, and the vane groove 9 is formed.
Gas flow holes 11-1 and 11-2 shown in FIG. 2 are provided between the back and the pockets 6-1 and 6-2 on both sides of the vane 2.

The diameter of the gas flow hole 12 is
By sufficiently smaller than -1,11-2, vane groove 9 Ura圧pressure P _C1 of the P _M space 6 outside the vane 2, P
Can be slightly larger than _C2 . The space 6-1 and the space 6-1 provided by providing the gas circulation holes 11-1 and 11-2.
The gas flow between 6 and 2 can be prevented by the backing rubber 8 of the vane 2 and is suppressed to a level that does not hinder practical use. The application of the present embodiment (vane groove back pressure P _M space 6
By the pressure P _C1 of -1,6-2, higher than P _C2), because the fine powder of the raw material is prevented from entering between the vanes 2 and the vane grooves 9, vane sticking and abnormal wear, damage of the vane Etc. can be greatly improved. In the figure, 7,
7-1 and 7-2 are side seals.

The preload chamber 10, the back of the vane groove 9, and the vane groove 9
Small holes 12 and 11 for ventilating the back and spaces 6-1 and 6-2
The provided -1,11-2, and the pressure P _H of the preload chambers 10,
By making the pressure higher than the high-pressure side pressure in the valve, the relationship of P _H ≧ P _M ≧ P _C is maintained at any position of the vane 2 with P _M as the back pressure of the vane groove 9 and P _C as the space pressure. Here, the conductance of the flow hole 12 of the vane side wall disk 3 is adjusted by the flow hole 1 from the back of the vane 2 to the space 6.
If sufficiently smaller than that of 1-1,11-2, possible P _M slightly larger than that P _C.

Therefore, the pressure difference between the back of the vane 2 and the outside of the vane 2 can always be sufficiently reduced, and abnormal increase of the pressing load of the vane 2 due to the pressure difference can be prevented. Further, since the back pressure of the vane 2 is always kept slightly higher than the pressure of the space 6, the gas flow always flows from the back of the vane 2 to the outside of the vane in the clearance between the vane 2 and the vane groove 9. Thus, the intrusion of the raw material fine powder into this portion can be significantly reduced. That is, according to the present embodiment, the simple measures of providing the two kinds of small holes 12, 11-1 and 11-2 increase the leak amount due to the fixation of the vane 2 and the vane 2 due to the increase of the back pressure of the vane 2. Abnormal wear and damage can be prevented.

[0011]

As described above in detail, according to the present invention, the followability of the vane can be always maintained in a good state, and the abnormal increase of the back pressure of the vane can be prevented. You can drive in the state. Therefore, the operation can be performed with a low power without increasing the temperature of the liner surface due to friction, and the durability and reliability of the apparatus can be improved, and the economic effect can be obtained by highly efficient operation.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a rotary valve according to an embodiment of the present invention.

FIG. 2 is a detailed front sectional view of a main part in FIG.

FIG. 3 is a detailed sectional view of a main part in FIG. 1;

FIG. 4 is a cross-sectional view of a conventional rotary valve at a cross-sectional position along C-C in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Vane 3 Side wall disk 4 Packing 5 Shaft 6 Space 7 Side seal 8 Rubber (elastic body) 9 Vane groove 10 Preload chamber 11-1, 11-2 Gas circulation hole 12 Gas circulation hole

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Takashi Ogawa 1-31 Kurobeoka, Hiratsuka-shi Japan Tobacco Inc. Production Technology Development Center (72) Inventor Kensuke Uchiyama 1966-6 Japan (56) References JP-A-2-310216 (JP, A) JP-A-3-51726 (JP, U) JP-A-54-162079 (JP, U) Field (Int.Cl. ⁷ , DB name) B65G 65/30-65/48 B65G 53/00-53/28 B65G 53/32-53/66

Claims (1)

(57) [Claims] 1. A plurality of vanes radially formed on an outer periphery of a rotor shaft to form a plurality of rotating spaces, the vane being an elastic body disposed at the bottom of a vane groove and sliding on an inner peripheral surface of a casing. In a rotary valve which is movably supported and continuously discharges a raw material supplied from an inlet to an outlet having a pressure different from that of an inlet, the rotary valve penetrates between a pressure chamber and a vane groove outside a side wall disk partitioning a side portion of the space. Small air holes,
A rotary valve provided with a ventilation hole penetrating between the vane groove and the space.