JP2001225956A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary valve capable of securing a stable continuous operation without a fact that powder and grain intruding into a clearance between the inner surface of a casing and the outer surface of a side plate act as a brake of a rotor and without occurrence of abnormal noise or vibration by the powder and grain. SOLUTION: The rotary valve comprises a cylindrical casing 6 having a supply part, a discharge part, and a body part, a cover 4 for covering openings in both side surfaces of the casing 6, and a plurality of rotation blades 3 fixed to a rotation shaft in the body part of the casing 6, and side plates 5 that are formed integrally with a plurality of rotation blades 3 and face to the cover 4. Slits 5b, 5c are mutually formed near the inside and the outside of the outer surfaces 5a of the side plates 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary valve, and more particularly to a rotary valve having a pocket type rotor having a side plate formed integrally with a rotary blade in a casing.

[0002]

2. Description of the Related Art Conventionally, the structure of a rotor of a rotary valve used for handling a granular material is roughly classified into an open type rotor without a side plate and a side plate (also referred to as a side wall). There is a pocket type rotor.

FIG. 5 shows an example of a conventional rotary valve provided with an open type rotor. The rotary valve 30 includes a supply section 31a, a discharge section 31b, and a body section 31.
c, a cover 34 for covering openings on both side surfaces of the casing 31, and a rotating shaft 32 extending horizontally in the body 31 c of the casing 31. A plurality of rotating blades 33 are provided, and the leading ends of the rotating blades 33 rotate while sliding or approaching the inner peripheral surface of the body 31 c of the casing 31.

FIG. 6 shows an example of a conventional rotary valve provided with a pocket type rotor. The rotary valve 40 has a cylindrical shape provided with a supply portion 41a, a discharge portion 41b, and a body portion 41c. A casing 41; and a side cover 44 for covering openings on both side surfaces of the casing 41.
A plurality of rotating blades 43 fixed to a rotating shaft 42 in a body 41c of a casing 41;
3 and a side plate 45 at a position facing the side cover 44, and the tip of the rotary blade 43 rotates while sliding or approaching the inner peripheral surface of the body 41 c of the casing 41. I do.

The rotary valve 30 having the open rotor shown in FIG. 5 is arranged in a circumferential direction (between the tip of the rotary blade 33 and the inner peripheral surface of the body 31c of the casing 31).
And sealing between both sides (between the side surface of the rotary blade 33 and the inner surface of the cover 34), and the rotary valve 40 equipped with the pocket type rotor shown in FIG. 41 (between the inner peripheral surface of the trunk portion 41c).

The above-mentioned conventional rotary valves 30 and 40
Each of them has advantages and disadvantages, and the proper use of both is selected depending on the physical properties of the granular material, the use conditions, and the like.

[Problems to be solved by the invention]

However, in the case of a rotary valve 40 having a pocket type rotor, the side plate 45 generally rotates endlessly in the same plane as shown in FIG. Surface 45a,
Particulates that have entered the clearance between a part of the inner peripheral surface of the casing 41 and a portion (hereinafter, referred to as “opposing surface”) 41d opposed to the outer peripheral surface 45a cannot escape and are compacted to form a rotor. In the case of a brake or a powder with a relatively low melting point, the powder melts into the above-mentioned clearance due to frictional heat, creating a film-like resin that is not a product, or generating abnormal noise and vibration. In many cases, a problem such as occurrence of a problem occurs.

For this reason, as shown in FIG. 8, the above-mentioned problem has been solved by making the side plate 45 thinner and sharper toward the front end. Even if it is formed thin, the clearance on the same line does not change after all, and if the side plate 45 is sharpened, the leak amount increases by that much, and the sealing property of the rotary valve 40 decreases,
Problems such as rapid wear occur.

Therefore, in view of the above-mentioned problems of the conventional pocket type rotary valve, the present invention is characterized in that the powder or granular material that has entered the clearance between the inner peripheral surface of the casing and the outer peripheral surface of the side plate acts as a brake for the rotor. It is an object of the present invention to provide a rotary valve capable of ensuring stable continuous operation without generating noise or vibration due to the powder or granules.

[0010]

In order to achieve the above object, the present invention is directed to a cylindrical casing having a supply section, a discharge section, and a body section, and a cylindrical casing having both sides. A cover for covering the opening, a plurality of rotating blades fixed to a rotating shaft in the body of the casing, and a side plate integrally formed with the plurality of rotating blades and located at a position facing the cover. , Wherein slits are formed alternately on the outer peripheral surface of the side plate on the inner side and on the outer side.

According to the first aspect of the present invention, the outer peripheral surface of the side plate is formed with slits alternately on the inner side and the outer side, so that the outer peripheral surface of the side plate and the inner peripheral surface of the casing are formed. The granular material that has intruded into the clearance between can easily escape from the clearance. As a result, the granular material that has entered the clearance between the inner peripheral surface of the casing and the outer peripheral surface of the side plate does not act as a brake for the rotor, and does not generate abnormal noise or vibration. Continuous operation of the rotary valve can be secured in a stable state.

According to a second aspect of the present invention, as one preferred embodiment of the rotary valve according to the present invention, an outer peripheral surface of the side plate located between the adjacent slits extends in parallel with the rotation axis. It is characterized by having a linear outer peripheral surface. Thus, it is possible to provide a rotary valve that is simple in construction and easy to manufacture, while securing the above-described operation according to the first aspect of the invention.

According to a third aspect of the present invention, as one preferred embodiment of the rotary valve according to the present invention, an outer peripheral surface of the side plate located between the adjacent slits is inclined with respect to the rotation axis. The outer peripheral surface extends straight. Thus, the rotary valve that can form the outer peripheral surface of the side plate between the adjacent slits long while securing the above-described operation according to the first aspect of the present invention, and that can more effectively prevent leakage is provided. Can be provided.

[0014]

Next, a specific example of an embodiment of a rotary valve according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of a pocket-type rotor used for a rotary valve according to the present invention.
3 includes a plurality of rotating blades 3 fixed to a rotating shaft 2 housed in the body of FIG. 3 and a side plate 5 formed integrally with the rotating blades 3, and an outer peripheral surface 5 a of the side plate 5. Further, slits 5b closer to the inside and slits 5c closer to the outside are alternately formed. Adjacent slit 5
The outer peripheral surface 5d remaining between b and 5c is a straight line extending parallel to the rotation shaft 2.

With this configuration, as shown in FIG. 3, the opposing surface 6a which is a part of the inner peripheral surface of the casing 6 and opposes the outer peripheral surface 5a is intermittent, and
The granular material that has entered the clearance between a and the opposing surface 6a can easily escape from this clearance. Therefore, the granular material that has entered the clearance does not act as a brake for the rotor, and the granular material does not generate abnormal noise or vibration, and the continuous operation of the rotary valve can be ensured in a stable state. .

In this embodiment, adjacent slits 5
b, outer peripheral surface 5d of side plate 5 located between 5c
Is a linear outer peripheral surface extending in parallel with the rotation shaft 2, so that the side plate 5 can be easily processed,
An increase in manufacturing cost can be minimized.

Next, a second embodiment of the pocket type rotor used in the rotary valve according to the present invention will be described.
This will be described with reference to FIG.

In the first embodiment, a part 5d of the outer peripheral surface 5a located between the adjacent slits 5b and 5c of the side plate 5 is left in a straight line extending parallel to the rotation shaft 2. The pocket type rotor 7 in the embodiment is configured such that a part 8 d of the outer peripheral surface 8 a of the side plate 8 located between the adjacent slits 8 b and 8 c of the side plate 8
It is characterized in that it has a linear outer peripheral surface that extends obliquely with respect to, and other components are the same as in the first embodiment.

With this construction, the processing of the outer peripheral surface 8a of the side plate 8 requires a little time, as compared with the first embodiment, but the gap between the adjacent slits 8b and 8c is small. The outer peripheral surface 8d of the side plate 8 can be formed long, and leakage can be effectively prevented.

[0021]

As described above, according to the present invention,
Since the granular material that has entered the clearance between the outer peripheral surface of the side plate and the inner peripheral surface of the casing can easily escape from this clearance, the granular material that has entered the clearance acts as a rotor brake. ,
No abnormal noise or vibration is generated by this powder,
It is possible to secure continuous operation of the rotary valve in a stable state.

Further, by changing the shape of the outer peripheral surface of the side plate located between the adjacent slits,
In addition to the above effects, it is possible to make the rotary valve easy to manufacture, and to further increase the effect of preventing leakage.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a pocket type rotor used for a rotary valve according to the present invention.

FIG. 2 is a view showing the pocket type rotor of FIG. 1,
(A) is a front view, (b) is a side view.

FIG. 3 is an enlarged sectional view showing the vicinity of an outer peripheral surface of a side plate of the rotary valve of FIG. 1;

FIG. 4 is a view showing a second embodiment of the pocket type rotor used for the rotary valve according to the present invention,
(A) is a front view, (b) is a side view.

FIG. 5 is a view showing an example of a conventional rotary valve provided with an open-type rotor, wherein (a) is a cross-sectional view taken along a plane perpendicular to the axis of a rotating shaft, and (b) is a rotary figure. It is sectional drawing at the time of cutting | disconnecting by the longitudinal cross section containing an axis | shaft.

6A and 6B are views showing an example of a conventional rotary valve having a pocket type rotor, in which FIG. 6A is a cross-sectional view taken along a plane perpendicular to the axis of a rotating shaft, and FIG. It is sectional drawing at the time of cutting | disconnecting by the longitudinal cross section containing an axis | shaft.

FIG. 7 is an enlarged sectional view showing the vicinity of the outer peripheral surface of a side plate of the rotary valve of FIG. 6;

8 is an enlarged sectional view showing a case where the tip of a side plate of the rotary valve of FIG. 6 is formed sharply.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pocket type rotor 2 Rotating shaft 3 Rotating blade 4 Cover 5 Side plate 5a Outer peripheral surface 5b (Inner side) Slit 5c (Outer side) slit 5d (Remaining) outer peripheral surface 6 Casing 6a Opposing surface 7 Pocket type rotor 8 Side plate 8a Outer peripheral surface 8b (inner side) slit 8c (outer side) slit 8d (remaining) outer peripheral surface

Claims (3)

[Claims] 1. A cylindrical casing having a supply unit, a discharge unit, and a body, a cover for covering openings on both side surfaces of the casing, and a casing fixed to a rotating shaft in the body of the casing. A plurality of rotating blades, and a side plate formed integrally with the plurality of rotating blades and located at a position facing the cover. A rotary valve, wherein slits are formed alternately on the outer side. 2. The rotary valve according to claim 1, wherein an outer peripheral surface of the side plate located between the adjacent slits is a linear outer peripheral surface extending in parallel with the rotation axis. 3. The rotary valve according to claim 1, wherein an outer peripheral surface of the side plate located between the adjacent slits is a linear outer peripheral surface extending obliquely with respect to the rotation axis.