JPH0213393Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a jamming prevention device for a rotary valve that discharges granules etc. in a fixed amount.

(Prior art and its problems) As shown in FIG. 8, the conventional rotary valve has a generally horizontal rotary shaft 2 rotatably disposed inside a rotary case 1, and a plurality of blades on the outer peripheral surface of the rotary shaft 2. 21 are provided in a radial straight line, and the radially outer tip 21a of the blade 21 is brought close to the inner wall surface 1a of the case 1.
A granule discharge port 5 is provided at the lower end of the case 1, and a granule input port 6 is provided at the upper side of the case 1. Arrow R is the rotation direction of the rotary.

A problem with such a rotary valve is a phenomenon in which particles are caught in the vicinity of the front end P of the input port 6 in the rotational direction. That is, the blade tip 21
The grains may be pinched between a and the case inner wall surface 1a, thereby deforming or crushing the grains,
There is a risk of damaging the case itself.

In order to prevent the above-mentioned jamming phenomenon, devices with devised blade shapes have been developed, such as in Japanese Patent Publication No. 43-26892, but since the blade itself is extremely thick and has a large cross-sectional area, the case The internal space is not used efficiently. Therefore, the cost of materials for the blade is high, and the case also becomes large.

(Purpose of the invention) The purpose of the invention is to (1) reliably prevent granules from being bitten;
(2) Improving the supply capacity or making the case more compact by effectively utilizing the space inside the case; (3) Easier processing of blades, etc.

(Means for Achieving the Object) In order to achieve the above object, the present invention disposes a generally horizontal rotary shaft rotatably in a rotary case, and also provides a plurality of blades on the outer peripheral surface of the rotary shaft. In a rotary valve, the radially outward tip of the blade is located close to the inner wall of the case, a particle discharge port is provided at the bottom end of the case, and a particle input port is provided at the top of the case. A recess is formed on the inner wall surface of the case so as to be spaced from the tip of the blade over a certain distance from the inlet to the front side in the rotation direction, so that the blade has a generally uniform thickness. The blade is made of a thin plate material, and the tip of the blade is positioned further back in the rotation direction than the inner end on the rotation center side so that a space is created between the blade and the blade on the front side in the rotation direction when the granules are introduced. tilted to
And, when the blade is in a horizontal state, the angle between the horizontal line and the line connecting the inner end of the horizontal part of the blade and the front end of the grain inlet is smaller than the angle of repose of the grain. There is.

(Example) In FIG. 1, a horizontal rotary shaft 2 is rotatably supported in a rotary case 1, and a plurality of blades 3 are arranged on the outer peripheral surface of the rotary shaft 2 at equal intervals in the circumferential direction. They are set apart. A discharge port 5 is provided at the lower end of the case 1, and the discharge port 5 is connected to a high-pressure gas type particle transfer device 7. A granule inlet 6 is formed on the upper side of the case 1, and the inlet 6 is located on the rear side in the rotation direction R from the upper edge T of the rotational circumference of the blade 3 (hereinafter referred to as the "rear side").
), and the rear end portion (end portion on the rear side in the rotational direction) 6 b is formed at a position higher than the axis of the rotary shaft 2 .

A recess 9 is formed in the inner wall surface 1a of the case over a certain length from the input port 6 to the front side in the rotational direction R (hereinafter referred to as the "front side") beyond the upper edge T. The recess 9 is radially spaced apart from the blade tip 3a by a distance d corresponding to two or three grains.
For example, the distance d is 12 mm.

The blade 3 is composed of a thin plate having a generally uniform thickness, and extends slightly radially outward from the outer circumferential surface of the rotary shaft 2 in a radial straight line, and then reaches a bending point 3.
It is bent approximately 90 degrees rearward at point b, and extends straight to a position close to the inner wall surface 1a of the case. That is, the blade 3 includes a short radial rising portion 11 extending from the outer peripheral surface of the rotary shaft 2 to the bending point 3b, and a long inclined portion 8 extending from the bending point 3b to the tip portion 3a. Tip 3 of blade 3
a is close to the case inner wall 1a to the extent that the high pressure gas in the transfer device 7 does not leak to the input port side. That is, the high pressure gas inside the transfer device 7 is sealed. Note that a gas vent hole 10 is provided in a portion of the case 1 between the rear end portion 6b of the input port and the discharge port 5.

The positional relationship between adjacent blades 3 and the positional relationship between the blade 3 and the front and rear end portions 6a and 6b of the input port 6 will be described in detail. Angle α in Figure 1
is the angle formed by the inclined portion 8 of one blade 3 and the straight line connecting the tip 3a of the inclined portion 8 and the bent portion 3b of the blade 3 on the rear side thereof. The angle γ is the angle that a straight line connecting the bending point 3b and the front end 6a of the slot makes with respect to the horizontal line when the blade tip 3a comes to the rear end 6b of the slot. Further, the angle β is the angle that the inclined portion 8 of the previous blade 3 makes with respect to the horizontal line when the blade tip portion 3a is located at the rear end portion 6b of the input port. Also, let the angle of repose of the grain be θ. In the various angles described above, the angles α and γ are set smaller than the angle of repose θ, and the angle β is set larger than the angle of repose θ. By the way, in the illustrated example, α=10°, β
= 45°, γ = 25°, and the angle of repose θ varies somewhat depending on the type of grain, but is, for example, around 30° to 35°.

In the embodiment shown in FIG. 1, the blade tip 3a
When the blade 3 is located at the rear end portion 6b of the inlet, the inclined portion 8 of the blade 3 is set to be in a generally horizontal state.

(Function) When the rotary shaft 2 rotates from the state where one blade tip 3a is located at the rear end 6b of the input port as shown in FIG. 1 to the state shown in FIG. 2, the front and rear blades 3, 3 The particles flow into the space on the outer circumferential side between them, that is, into the triangular space S1 sandwiched between the inclined portion 8 of the rear blade 3 and the case inner wall surface 1a. Further, in the state shown in FIG. 2, particles do not flow into the triangular space S2 connecting the inclined part 8 of the front blade 3 and the bending point 3b of the rear blade 3 and the space S3 between the rising part 11.

The rotary shaft 2 further rotates from the state shown in FIG. 2, and as shown in FIG.
When a is located at the rear end 6b of the input port and approximately a predetermined amount of particles flow in, the angle γ is set smaller than the angle of repose θ, so the particles do not flow into the space S3 on the axis side. Also, the above-mentioned triangular space S
It doesn't even fit into 2. In other words, when a fixed amount of water flows in, extra spaces S2 and S3 are secured on the rear side of the front blade 3.

When the rotary shaft 2 further rotates from the state shown in FIG. 3, as shown in FIG. When the angle β with respect to the horizontal exceeds the angle of repose θ, the particle is in the space S
and flows into S2.

As shown in Fig. 5, the front and rear blades 3
When passes through the front end P of the recess 9 in the rotational direction,
Almost all of the grains are packed on the rotary axis side, and a space S' is formed on the outer peripheral side between the blades 3. Therefore, particles are not caught between the blade 3 and the inner wall surface 1a of the case.

When the rotary shaft 2 rotates further and the space between the front and rear blades 3 reaches the discharge port 5 as shown in FIG. 6, the particles fall into the transfer device 7 through the discharge port 5.

Note that since high pressure gas for the transfer medium exists in the transfer device 7, the pressure is also high in the area between the blades 3 in the state shown in FIG. 6, but on the way back from the outlet 5 to the input port 6, Gas vent hole (first
Figure) High pressure gas escapes from 10. Therefore, problems such as particles in the input port 6 being pushed back upward by the high pressure gas do not occur.

(Another Embodiment) The embodiment shown in FIG. 7 is an example in which a straight blade 3 having no bent portion is used. By the way, the 7th
The embodiment shown in the figure is the rising part 11 of the embodiment shown in FIG.
The shape is omitted.

(Effects of the invention) As explained above, the invention has the following features: (1) The granule inlet 6 is located on the rear side in the rotational direction than the upper end of the blade, and the inner wall surface 1a of the case 1 is
A recess 9 is formed so as to be spaced apart from the tip of the blade 3 over a certain distance from the input port 6 toward the front in the rotation direction, and a space (for example, S2, S
3), the blade 3 is tilted so that its tip 3a is on the rear side in the direction of rotation than the inner end on the rotation center side, so that while the blade 3 passes through the section of the recess 9, The particles are packed on the rotary axis side, and a space S' is formed on the outer circumferential side. Therefore, the blade tip 3a
The jamming phenomenon of the grains between the inner wall surface 1a and the case inner wall surface 1a is eliminated, and it is possible to prevent damage to the blade 3 and case 1, or deformation or crushing of the grains due to the jamming phenomenon.

To explain in more detail, the important feature of the present invention is that the blade 3 on the forward side in the rotational direction is
The blade 3 is tilted so that its tip 3a is rearward in the rotational direction than the inner end 3b on the rotation center side so that spaces S2 and S3 are created between the blade 3 and the blade 3 in a horizontal state. The angle γ between the horizontal line and the line connecting the inner end 3b of the horizontal part of the blade 3 and the front end 6a of the granule inlet port is
The angle of repose θ of the particles is configured to be smaller than the angle of repose θ of the particles.

With the above configuration, when the blade 3 is in the horizontal state, particles on the blade do not flow into the spaces S2 and S3, the spaces S2 and S3 are secured as unfilled parts, and when the blade 3 is in the above-mentioned position, the particles on the blade do not flow into the spaces S2 and S3. The particles are in the space S2, S
3, and the particles are completely contained within the blade 3.

Therefore, after passing through the granule inlet, there is no overflowing granules beyond the blade tip 3a, and it is possible to reliably prevent granules from getting caught, especially at the front end P of the recess 9.

(2) Since the blade 3 is made of a thin plate material with a generally uniform thickness, the dead space inside the case 1 is extremely small, and the space inside the case 1 can be used extremely effectively. Therefore, the capacity of the rotary valve can be increased while keeping the size of the case compact. Further, the blade 3 is easy to process, and the processing cost is low.

(3) By adopting a structure in which the granule inlet 6 is arranged on the upper side of the case 1, the vertical length of the inlet 6 can be reduced and the case can be made lightweight and compact.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rotary valve to which the present invention is applied, FIGS. 2 to 6 are partial longitudinal sectional views sequentially showing the operation of the rotary valve, and FIG. 7 is a longitudinal sectional view showing a modification of the blade. FIG. 8 is a longitudinal sectional view of a conventional example. 1... Case, 2... Rotary shaft, 3... Blade, 3a... Tip, 5... Discharge port, 6...
Inlet port, 9... recess.

Claims (1)

[Scope of utility model registration request] A generally horizontal rotary shaft 2 is rotatably disposed in a rotary case 1, and a plurality of blades 3 are provided on the outer peripheral surface of the rotary shaft 2, and the radially outer tips 3a of the blades 3 are attached to the inner wall surface 1a of the case. In a rotary valve in which a granule discharge port 5 is provided at the lower end of the case 1 and a granule input port 6 is provided at the upper side of the case 1, the inlet 6 is placed rearward in the rotational direction than the upper end T of the blade. A recess 9 is formed on the inner wall surface of the case 1 at a distance d from the tip 3a of the blade 3 over a certain distance forward in the rotational direction from the inlet 6, so that the blade 3 has a generally uniform thickness. It is constructed from a thin plate material, and the blade 3 is arranged so that its tip 3a is lower than the inner end 3b on the rotation center side so that spaces S2 and S3 are created between it and the blade 3 on the forward side in the rotational direction when granules are introduced. The angle γ between the horizontal line and the line connecting the inner end 3b of the horizontal part of the blade 3 and the front end 6a of the granule input port when the blade 3 is tilted to the rear side in the rotation direction and is in a horizontal state. is smaller than the angle of repose θ of the particles.