JP2001199545A - Rotary valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid internal contamination resulting from powder such as foods or medicine while assuring air lock of a rotary valve, and to achieve easy cleaning and inspection of the rotary valve. SOLUTION: During inspecting the rotary valve 1, a knob bolt 24 is removed, an access door 20 is opened, a supporting recessed portion 28 is separated from a terminal protruded portion 70 and a driving side bearing 33 is in the form of overhanging a shaft 7. The terminal protruded portion 70 is deflected δdownward and so there is an error in clearance between a rotor 8 and a face plate 2, but no trouble occurs in a non-operated condition. When a bolt 74 is removed, a rotor 8 is pulled off the shaft 7, which can be taken outside through an inspection hole 40, resulting in easier internal inspection and cleaning. When the access door 20 is closed, the terminal protruded portion 70 and the supporting recessed portion 28 are guided along tapered faces 61, 71 and forcibly fitted to each other and the access door 20 is fixed to a driven side plate 4 with the knob bolt 24.

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 performing a constant supply of powder and granules.

[0002]

2. Description of the Related Art Conventionally, rotary valves have been used for applications such as constant discharge or pneumatic transportation. When a fixed amount is discharged by a rotary valve, the clearance between the rotor and the inner wall of the casing may be, for example, about 0.2 to 0.3 mm. On the other hand, it is necessary to perform air lock in the vertical direction of the rotary valve, that is, where there is a pressure difference between the powder supply port side and the powder discharge port side, so that the clearance between the rotor and the casing inner wall is as small as possible. Is preferred. For example, approximately 0.12 mm or less (for example, 0.10 mm)
A high accuracy of about mm to 0.06 mm, particularly about 0.07 mm to 0.08 mm) is required. For this reason, accuracy is generally ensured by bearing the rotor at both ends. Meanwhile, food,
When supplying powders such as pharmaceuticals, it is necessary to clean and inspect the inside of the rotary valve in order to avoid the problem that the powder adheres to the rotor and causes internal contamination (contamination and decay).

However, due to the structure of the bearing at both ends, the periphery of the bearing is firmly covered with a seal, a cover, etc. in order to prevent powder leakage and the like. It is very difficult because it involves disassembly work.

[0004]

SUMMARY OF THE INVENTION Accordingly, the inventions of claims 1 to 3 solve the problem of internal contamination caused by powders of foods, medicines and the like while securing the air-lock action of the rotary valve. The purpose is to facilitate cleaning and inspection of the rotary valve.

[0005]

Here, it is conceivable that the driven end of the rotary valve is a door structure which can be opened and closed, and the driving end of the rotary valve has a single bearing structure. However, the driven end of the rotary valve is free. Since it is an end and is not supported, the clearance error due to the drooping of the free end increases, which is inconvenient for the airlock. In order to solve this, in the single-bearing structure, a plurality of single-bearings are provided at the drive-side end at predetermined intervals to reduce an error in the clearance of the rotor at the driven-side end. The motor base covering this becomes long, and the rotary valve becomes large. Therefore, during operation of the rotor, it is difficult to satisfy the accuracy unless the drive shaft (shaft) of the rotor is also a bearing at both ends.

In view of the above problems, the invention according to claim 1 is directed to a casing having a powder supply port and a powder discharge port respectively provided in a vertical direction, a casing having a powder transport chamber, and a rotatable casing. And a rotor fixed to the shaft and having a plurality of blades radially defining the powder transport chamber. The rotor rotates to supply powder to the powder supply port. In the rotary valve to send out to the powder outlet through the powder transport chamber from the, the casing rotatably supports the shaft, a drive unit side plate with a drive unit side bearing protected by a seal member, A driven part side plate having an inspection hole, a driven part side bearing protected by a seal member that rotatably supports the shaft, and a driven part side shaft end of the shaft. And a support portion rotatably supported by the driven portion side bearing, and an inspection door capable of opening and closing the inspection hole, and the driven portion side shaft end portion. The support portion is a rotary valve characterized in that a convex portion and a concave portion having a taper surface capable of being fitted are configured to be able to be fitted and removed. Thus, when the inspection door is closed and the rotor is rotating, the bearing is supported at both ends, and when the inspection door is opened, the bearing is supported at one end, so that the above problem can be suitably achieved.

According to the second aspect of the present invention, when the inspection door is closed and the shaft is rotated by making the diameter of the convex portion and the concave portion different, the tapered surfaces are in frictional engagement with each other, The rotary valve according to claim 1, wherein a predetermined gap is formed between the rotor and the inside of the inspection door. Accordingly, the above-described problem can be suitably achieved, the driving force is suitably transmitted, and the friction between the rotor and the inspection door is eliminated by the gap.

According to a third aspect of the present invention, the rotor is detachably attached to the shaft with a screw, and the inspection hole has a diameter larger than the diameter of the rotor. It is a rotary valve of the description. Thereby, the above-mentioned subject can be suitably achieved, and at the time of inspection and cleaning of the inside, the inspection door can be opened and the rotor can be taken out through the inspection hole, and the cleaning and inspection work can be further facilitated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary valve 1 according to an embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 to 6, the rotary valve 1 includes an arc surface 2 a (see FIG. 5) at a substantially central portion of the inner wall surface.
A pair of substantially tile-shaped face plates 2 whose outer wall surfaces are cut into a crystal shape, and the ends are connected to each other by bolts 3a (see FIG. 6) orthogonal to the drive unit side of the pair of face plates 2 and are formed at the center. Drive unit side plate 3 provided with through hole 30 (see FIG. 7)
The ends of the pair of face plates 2 are connected at right angles to the driven portion side of the pair of face plates 2 with bolts 4a (see FIG. 4), and the large-diameter inspection hole 4 is formed.
0 (see FIG. 8) and the driven side plate 4 and the face plate 2 described above.
Main body casing 5 made of light metal or the like, which is composed of a driving portion side plate 3 and a driven portion side plate 4, and an inspection door 20 described later.
And a shaft 7 made of stainless steel and rotatably supported at both ends thereof at right angles to the drive unit side plate 3 and the driven unit side plate 4.
(See FIGS. 5 and 7), a rotor 8 (see FIG. 5) fixed to the shaft 7, and the like. When the inspection door 20 is closed and the rotor 8 is rotating, the shaft 7 is supported at both ends. When the inspection door 20 is opened, the shaft 7 is supported at one end.

The rotary valve 1 is, as shown in FIG.
A rectangular powder inlet 9 (see FIG. 5) and a rectangular powder outlet 10 (see FIG. 5) are provided at the upper and lower portions, respectively.
They are in communication with the powder transport chamber 6. That is, a powder inlet 9 into which powder is injected is formed on the upper surface of the rotary valve 1, and an inlet connection surface 11 to which an upstream powder device (not shown) is connected is provided on the upper surface of the face plate 2. In addition, a plurality of screw holes 12 for mounting the device are provided. On the other hand, as shown in FIG. 3, a powder discharge port 10 through which the powder supplied from the powder supply port 9 is transported by the rotation of the rotor 8 is formed on the bottom surface of the rotary valve 1. An outlet connection surface 13 to which the powder device (not shown) is connected is provided, and a plurality of screw holes 14 for connecting the powder device on the downstream side are provided.

When viewed from the side, the rotor 8 has a cylindrical portion 15 and a plurality of plate-like blades 16 radially extending radially from the outer diameter surface of the cylindrical portion 15 as shown in FIG. When,
The powder transport chamber 6 is partitioned to form a trough 17 between the blades 16. The clearance between the rotor 8 and the inner wall of the face plate 2 is generally 0.12 mm or less (for example, 0.1 mm or less).
(0 mm to 0.06 mm, particularly 0.07 mm to 0.08 mm), to prevent air leakage in the vertical direction, that is, where there is a pressure difference between the powder supply side and the powder discharge side. , The pressure difference can be maintained, and appropriate air lock can be achieved. The shaft 7 is fitted and fixed in the hollow portion 80 of the cylindrical portion 15, and the shaft 7 and the rotor 8 are moved in the direction of arrow A by the driving force of the motor 50 (see FIGS. 1 to 3) as shown in FIG. Are integrally rotatable.
As a result, the powder supplied from the powder supply port 9 is transported by the trough 17 by the rotation of the rotor 8, and the powder discharge port 1
It is discharged downstream from 0. The shape of the tip of the blade 16 is
Generally, there are a normal type and an edge type. Here, in order to increase abrasion resistance and supply efficiency, an edge 18 whose end face is cut obliquely to the rotation direction of the rotor 8 is used.
Is adopted.

By the way, in order to eliminate contamination (pollution due to putrefaction) of powders of foods, medicines and the like and further promote hygiene, inspection of the inside of the rotary valve 1 is performed.
It is necessary to enable cleaning, disassembly, etc. For this reason, the inspection door 20 has a structure that can be opened and closed by being connected to the driven portion side plate 4 and the like at the hinge portion 21 and protruding toward the back surface thereof and having a tapered surface 22a (see FIGS. 2 and 3). (See FIG. 7) can be fitted into the inspection hole 40 of the driven portion side plate 4 with tapered surfaces. The hinge portion 21
A driven portion-side protrusion 212 (see FIG. 1) having a vertically formed elongated hole 211, a hinge pin 213 inserted into the elongated hole 211 and capable of moving back and forth, and connected to the hinge pin 213 and to the inspection door 20. And a connecting portion 215 fixed by screws 214. Further, the inspection door 20 is provided with a plurality of mounting holes 23 (see the right side in FIG. 8), the knob bolts 24 (see FIG. 4) are mounted, and the screw holes 42 (see FIG. (See left side). As shown in FIG. 9, a driven-side bearing 25, which is a single-row deep groove ball bearing, is provided on the inner surface of a through hole 26 at the center of the inspection door 20, and the inner surface of the outer portion thereof is made of transparent polycarbonate with an adhesive or the like. A transparent lid 27 made of stainless steel is fixed flush and is shielded from outside air. Further, a support recess 28 rotatably supported by the driven side bearing 25 is disposed in the through hole 26. The support recess 28 has a concave surface on the right side and a reduced diameter portion on the left side. A ring-shaped seal portion 29 (here, an oil seal) is interposed between the support recess 28 and the inner wall of the through hole 26 to prevent powder from entering.
As shown in FIG. 10, the right side surface of the support recess 28 is formed by a continuous tapered surface 61 having a conical band shape and a vertical surface 62 having a circular shape, and the outer diameter surface is gradually increased from the root to the tip. It has a frustoconical shape formed in a tapered shape.

The shaft 7 is provided in the hollow portion 8 of the rotor 8.
0 (see FIG. 7), and is a dimension that can be inserted.
A concave portion 81 is formed in the hollow center portion of the shaft end portion of the rotor 8 in a substantially radial direction while slightly leaving the outer peripheral wall 82, and most of the terminal convex portion 70 can be freely fitted into and removed from the concave portion 81. ing. The terminal convex portion 70 is attached to the shaft 7 by the rotor 8.
Is detachably fixed to the shaft 7 and the rotor 8 with screws or the like. As shown in FIG. 10, the surface of the terminal convex portion 70 is composed of a continuous tapered surface 71 having a conical band shape and a circular vertical surface 72, and the outer diameter surface is gradually reduced from the root portion to the tip portion. And a frustoconical shape formed in a tapered shape. On the other hand, since the radius of the circular vertical surface 62 of the support concave portion 28 has a similar shape whose dimension is set slightly smaller than the radius of the circular vertical surface 72, the tapered surfaces 61 and 71 A suitable frictional engagement becomes possible at the time of rotational driving, and a gap C1 is formed without completely fitting the vertical surfaces 62 and 72, and a clearance C2 is formed between the outer region surfaces of the tapered surfaces 61 and 71. By ensuring this, a clearance is formed between the right side surface (inner side surface) of the inspection door 20 and the left end surface of the rotor 8, and wear is reduced. This clearance is preferably set as small as possible in order to make the air lock effective, for example, 0.12 mm or less (for example, 0.10 mm
A high precision of about 0.06 mm, especially 0.07 mm to 0.08 mm) is maintained.

As shown in FIGS. 8 and 9, a plurality of mounting holes 73 are formed around the end protrusion 70, and bolts 7 are formed therein.
4 is screwed into the screw hole 75 of the rotor 8. A mounting hole 76 is formed in the center of the terminal convex portion 70, a bolt 77 is mounted, and screwed into a screw hole 78 formed in the center of the end face of the shaft 7. The parallel key 79 of the shaft 7 is inserted into the groove of the rotor 8,
Idling is prevented, and the rotational drive of the shaft 7 is transmitted to the rotor 8.

On the other hand, as shown in FIG. 1 and FIG.
The drive-side bearing 33 is provided on the inner wall of the through hole 30 (see FIG. 7).
Is provided. A sealing ring 31 made of Teflon, a ring-shaped sealing portion 32 (here, an oil seal), and a driving-side bearing 33 which is a single-row deep groove ball bearing are provided between the outer peripheral surface of the driving-side end portion of the shaft 7. The driving side bearing 33 is fixed by a bearing presser 34 interposed. A motor shaft fixing hole 99 is opened at a center of the right end of the shaft 7 over a predetermined length, and a drive shaft of the motor 50 is fitted and connected thereto. The shaft cover 51 of the motor 50 is connected to the cover 35 of the drive unit side plate 3 by bolts 36. A connection box 52 is provided on the motor 50 (see FIGS. 1 to 3).

In the rotary valve 1 described above, the knob bolt 24 is removed at the time of inspection or the like, and when the inspection door 20 is opened as shown by a two-dot chain line in FIGS. The support recess 28 is detached from the shaft 70, and the motor 50 and the drive-side bearing 33 have a structure in which the shaft 7 is cantilevered. As shown in FIG. Although there is an error in the clearance between the rotor 8 and the face plate 2 due to the drooping by δ, there is no effect at all because it is not in operation. And
By removing the bolt 77, the rotor 8 can be pulled out of the shaft 7 and taken out through the inspection hole 40, so that the internal inspection and cleaning can be further facilitated. On the other hand, when driving, when the inspection door 20 is closed in a reverse procedure to the above,
The terminal convex portion 70 and the supporting concave portion 28 are guided along the tapered surfaces 61 and 71 and are forcibly fitted together, the inspection door 20 is fixed to the driven portion side plate 4 with the knob bolt 24, and the shaft 7 is fixed at both ends. Supported. Therefore, as shown in FIG. 10B, the sag δ shown in FIG. 10A is eliminated, and the clearance between the edge 18 of the rotor 8 and the inner wall of the face plate 2 is forcibly secured in accuracy. In these situations,
When the motor 50 drives the shaft 7, the terminal protrusion 70 and the support recess 28 rotate integrally by frictional engagement, and the shaft 7 is properly supported by the both-ends support structure, and the clearance between the rotor 8 and the face plate 2 and the like. The powder is supplied while maintaining the precision of the powder.

According to the rotary valve 1, since the inspection door 20 is provided so as to be openable and closable, sanitary management is facilitated, and the type of food, the pharmaceutical industry, or a frequently transported product, which particularly requires sanitary properties, can be selected. It is possible to cope with a use that is changed. Also, when using a rotary valve with an airlock structure that is used where there is a pressure difference above and below, that is, where there is a pressure difference between the supply side and the discharge side of the rotary valve, check when the rotor rotates. Since the door 20 is closed and both ends of the shaft 7 are supported, the accuracy of the clearance is secured, so that the air lock works effectively and the reliability can be improved.

The effect of the above airlock operation compared with the prior art will be described in detail below. That is, when a fixed amount is discharged by a rotary valve, the clearance between the rotor and the inner wall of the casing is, for example, 0.2 to 0.3.
mm, but it is necessary to perform air lock where there is a vertical pressure difference between the rotary valve and the clearance between the rotor and the inner wall of the casing is 0.12 mm or less (for example, 0.10 mm to 0.06 mm, especially 0 mm). 0.07mm ~
A high accuracy of about 0.08 mm) is required, and it is difficult to satisfy the accuracy unless the drive shaft of the rotor is a bearing at both ends. Conventionally, in general, the bearing protrudes from the end of the lid, and the size becomes large and the appearance deteriorates. However, in the present embodiment, while the rotary valve is downsized, the problem is preferably solved. is there. In addition, in the related art, one end of the drive shaft may be a single bearing, but since the other end is a free end and is not supported,
In order to solve the problem, the error of the clearance becomes large and it is inconvenient.To solve this, if one attempts to reduce the error of the clearance by arranging a plurality of single bearings side by side at a predetermined interval, the single bearing and the motor base covering it There is a drawback that the rotary valve becomes longer and the rotary valve becomes larger. However, in the present embodiment, the problem is preferably solved while reducing the size of the rotary valve.

Further, the casing body is divided and cast into aluminum to reduce the weight, to provide abrasion resistance and corrosion resistance by performing a surface hardening treatment, and to simplify the parts by directly connecting the motor 50. Thus, a weight reduction of approximately one third or less of that of the conventional rotary valve has been realized. As a result, not only the installation work and maintenance in a powder factory or the like become easy, but also the number of workers can be reduced, and the running cost can be reduced. Furthermore, by adopting a main body casing of aluminum casting, and by precisely processing the tip of the blade 16 using a high-precision machine tool, a clearance between the arc surface 2a (for example, 0.1 mm) is obtained.
(Approximately 12 mm or less)), and high performance can be exhibited even in a supply path having a pressure difference (a pie line or the like). In this embodiment, a motor 50 (geared motor) directly connected to the shaft 7 is used as the motor 50 for driving the rotor 8, but a motor with a driving component such as a sprocket or a chain is used to change the rotation speed of the motor. It is also possible to make it easier.

It should be noted that the present invention is not limited to the above-described embodiments or embodiments, and modifications and the like can be added without departing from the technical idea of the present invention. Such modifications and equivalents are also included in the technical scope of the present invention. As an example, the terminal protrusion 70
Instead of the supporting concave portion 28, a terminal concave portion and a supporting convex portion may be used, and the fitting may be reversed.

[0021]

According to the first to third aspects of the present invention, while securing the air lock of the rotary valve,
In addition to eliminating internal contamination caused by powders of foods, pharmaceuticals, etc., cleaning and inspection of the rotary valve can be facilitated.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing a rotary valve according to an embodiment of the present invention.

FIG. 2 is a plan view showing the rotary valve.

FIG. 3 is a bottom view showing the rotary valve.

FIG. 4 is a left side view of the rotary valve.

FIG. 5 is a sectional view taken along the line IV-IV of FIG. 1;

FIG. 6 is a right side view of the rotary valve.

FIG. 7 is a sectional view taken along the line VI-VI of FIG. 3;

FIG. 8 is a left side view with the inspection door opened.

FIG. 9 is a detailed structural view around a driven-part-side bearing.

FIGS. 10 (a) and (b) are explanatory views showing the manner in which a terminal protrusion and a support recess are fitted and removed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotary valve, 2 ... Face plate, 2a ... Arc surface, 3 ...
Drive unit side plate, 3a ... bolt, 30 ... through hole, 31 ... ring, 32 ... seal member, 33 ... drive side bearing, 34
... bearing retainer, 35 ... cover, 36 ... bolt, 4 ...
Follower side plate, 4a bolt, 40 inspection hole, 42 screw hole, 5 body casing, 6 powder transport chamber, 7 shaft, 8 rotor, 80 hollow part, 81 concave part, 9 part Powder input port, 10: Powder discharge port, 11: Input port connection surface, 1
2 ... screw hole, 13 ... outlet connection surface, 14 ... screw hole, 15
... cylindrical part, 16 ... blade, 17 ... trough, 18 ... edge,
20 inspection door, 21 hinge part, 22 lid back part, 22a
... taper surface, 211 ... long hole, 212 ... driven part side protruding part,
213: hinge pin, 214: screw, 215: connecting portion,
Reference numeral 23: mounting hole, 24: knob bolt, 25: driven side bearing, 26: through hole, 27: transparent lid, 28: supporting recess,
29: seal portion, 50: motor, 51: shaft cover, 52: connection box, 61: tapered surface, 62: vertical surface, 70: terminal convex portion, 71: tapered surface, 72: vertical surface,
C1: clearance C2: gap, 73: mounting hole, 74:
Bolt, 75 ... screw hole, 76 ... mounting hole, 77 ... bolt,
78: screw hole, 79: parallel key, 99: motor shaft fixing hole

Claims (3)

[Claims] 1. A casing having a powder supply port and a powder discharge port respectively provided in a vertical direction, a powder transport chamber, a shaft rotatably disposed in the casing,
A rotor that is fixed to the shaft to partition the powder transport chamber by radially having a plurality of blades, and that the rotor rotates to transfer powder from the powder supply port to the powder transport chamber. A rotary valve that feeds the powder to the powder outlet through a casing, wherein the casing rotatably supports the shaft, a drive unit side plate including a drive unit side bearing protected by a seal member, and a driven unit including an inspection hole. A side plate, a driven portion-side bearing protected by a seal member that rotatably supports the shaft, and an end of a driven portion-side shaft end of the shaft that can be supported and rotatable on the driven portion-side bearing And an inspection door that can open and close the inspection hole. The driven portion side shaft end and the support portion have a taper surface that can be fitted. Rotary valve, wherein the projections and recesses are those composed freely Hamada'. 2. When the inspection door is closed and the shaft is rotated, the convex portion and the concave portion have different diameters, and the tapered surfaces are brought into frictional engagement with each other, and the rotor and the rotor are connected to each other. The rotary valve according to claim 1, wherein a predetermined gap is formed between the inside of the inspection door and the inside of the inspection door. 3. The rotary valve according to claim 1, wherein the rotor is configured to be detachably attached to the shaft with a screw, and the inspection hole has a diameter larger than a diameter of the rotor. .