JP3245141B2 - 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 supplying powders of food, medicine and the like.

[0002]

2. Description of the Related Art Conventional rotary valves are disclosed, for example, in JP-A-9-58871 and JP-A-10-212034.
There is a double-ended bearing type described in
The rotation direction of the motor can be checked from the outside at the drive side end.

However, in practice, mechanical parts such as a conductive pulley are covered with a threaded safety cover, and the safety cover must be removed only for checking the rotation direction, which requires time and labor. You. In addition, there is a problem that it is difficult to confirm the rotation direction of the motor, and even if the rotation direction of the motor can be confirmed, it is only the rotation direction of the pulley, and cannot directly check the rotation direction of the rotor inside the rotary valve. Further, in the type in which the motor is directly connected to the rotary valve, the driving side is covered with the motor cover, and there is a disadvantage that even the rotation direction of the shaft cannot be confirmed. For the type in which the cooling fan inside the motor is visible, the rotation direction of the rotor can be checked by checking the rotation direction of the cooling fan.However, some motors have different rotation directions of the cooling fan and shaft. Yes, the setting may be reversed. Further, FIG.
As shown in (b) and (c), in the edge-processed rotor, since the rotation direction is predetermined, it is important to check the rotation direction of the rotor. Further, since there may be a rotation state of the rotor of the rotary valve, for example, idling, rotation failure, etc., it is sometimes necessary to check them.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to easily check the rotation direction of the rotor of a rotary valve.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the invention according to claim 1 comprises 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, A shaft rotatably arranged on 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 powder is transferred from the powder supply port to the powder transport chamber by rotating the rotor. A rotary valve that feeds the powder to the powder discharge port, wherein the casing includes a driving unit side member and a driven unit side member, and the shaft is supported by a bearing provided in a through hole of the driving unit side member and the driven unit side member. A rotary valve, wherein a motor is connected to the driving unit side member, and an inspection window is provided in a through hole of the driven unit side member. Thereby, the above-mentioned problem can be suitably solved. The motor may be directly connected coaxially to the driving unit side member, or the shaft and the motor shaft may be arranged in parallel and connected by a driving member such as a chain.

According to a second aspect of the present invention, the inspection window is provided with a transparent member, the through hole is closed, and an edge is processed at an end of the rotor. It is a valve. Thereby, the above-mentioned problem can be suitably solved.

[0007]

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 FIG. 1, the rotary valve 1 includes a pair of face plates 2 as a substantially tile-shaped casing member having an arc surface 2 a (see FIG. 4) therein, and a driving unit side of the pair of face plates 2. The drive part side plate 3 whose ends are connected to each other by a bolt 3a (see FIG. 6) orthogonally, and the driven part whose ends are connected by a bolt 4a (see FIG. 4) orthogonal to the driven part side of the pair of face plates 2 And a powder transport chamber 5 (see FIGS. 4 to 6) surrounded by a main body casing composed of the unit side plate 4, the face plate 2, the drive unit side plate 3, and the driven unit side plate 4. The driven-side bearing 6 provided, a ring-shaped oil seal 91 provided inside the driven-side bearing 6, and the driven-side bearing 6, which is a single-row deep groove ball bearing penetrating the inside of the powder transport chamber 5, Drive side bearing 26 which is a row deep groove ball bearing (details Structure drive side bearing 3 in FIG. 17
26) and a shaft made of stainless steel rotatably supported by a ring-shaped oil seal 94, and a circle made of transparent polycarbonate, which is attached to the driven bearing 6 via a bolt 8. It comprises a shaft cover 9 having an inspection window 9a, which is a plate-like observation window, at the center, and a rotor 10 fixed to the shaft 7. The shaft 7 is connected to a drive shaft of a motor 20 (geared motor) by a connecting member (not shown) such as a key, and a shaft cover 21 of the motor 20 is connected to a cover 31 of the drive unit side plate 3 by bolts 32.

As shown in FIG. 20, there are two types of rotor shapes, a normal shape and an edge shape. An inclined surface is formed on the back surface, and FIG.
As shown in (b), it is necessary to rotate in one determined direction (right rotation in the figure). There are two types of motors that rotate the rotor of the rotary valve, one for single-phase AC and the other for three-phase AC. In the case of a three-phase AC motor, the rotation direction changes depending on the phase. Cannot be confirmed, and an appropriate rotor edge effect may not be obtained. However, the rotation direction of the shaft 7 can be easily inspected simply by looking at the inspection window 9a which is the above-mentioned observation window. A rotation direction identification mark 9b (see FIG. 4), for example, an isosceles triangle is attached to the side surface of the end portion of the shaft 7, and inspection is further facilitated by looking at the mark.

The face plate 2, the drive unit side plate 3, the driven unit side plate 4, and the rotor 10 are formed by hardening aluminum surface.
For example, it is cast from corrosion-resistant aluminum that has been subjected to an oxide film forming treatment or the like.

The dimensions and the like of the rotary valve are determined so that a desired supply / discharge amount Q (t / h) is obtained. The supply / discharge amount Q (t / h) is determined from the following rotary valve discharge formula. The shape and dimensions of the rotary valve affect the discharge capacity ν. Q = 60 · η · γ · ν · N (1) where η is the volumetric efficiency and γ is the bulk specific gravity (t /
m ³ ), ν is the discharge capacity per rotation of the rotor (m ³ ), and N is the rotor rotation speed (rpm).

The details of the rotary valve 1 will be described below. As shown in FIG. 2, the rotary valve 1 has a rectangular powder inlet 11 and a rectangular powder outlet 12 (see FIG. 3) at upper and lower portions, respectively.
Is in communication with That is, a powder input port 11 for inputting powder is formed on the upper surface of the rotary valve 1 and the face plate 2 is opened.
An inlet connection surface 13 to which an upstream powder device (not shown) is connected is provided on the upper surface of the device, and a plurality of screw holes 13a are provided. On the other hand, on the bottom of the rotary valve 1, FIG.
As shown in the figure, a powder discharge port 12 through which the powder supplied from the powder supply port 11 is transported by the rotation of the rotor 10 is formed with an opening, and a downstream powder device (not shown) is connected. An outlet connection surface 14 is provided, and a plurality of screw holes 14a are provided.

When viewed from the side, the rotor 10 has a cylindrical tubular portion 15 and a plurality of blades 16 extending radially from the tubular portion 15 as shown in FIGS.
The powder transport chamber 5 is partitioned so that a trough 17 is formed between the blades 16. The shaft 7 is fitted in the center hole of the cylindrical portion 15 and can be integrally rotated with the shaft 7 in the direction of arrow A by the driving force of the motor 20, as shown in FIG. As a result, the powder input from the powder input port 11 is transported by the trough 17 by the rotation of the rotor 10 and is discharged from the powder output port 12 to the downstream side. The shape of the tip of the blade 16 is a crystal cut 18 with improved wear resistance.

According to the rotary valve 1 described above, it is possible to check whether the rotor 10 is operating normally and whether the rotation direction of the rotor 10 is correct by observing the inspection window 9a. In addition, the casing body was divided and cast into aluminum to reduce the weight, and the surface was hardened to provide abrasion resistance and corrosion resistance. The weight of the rotary valve is reduced to about one-third or less of that of the rotary valve. 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 saved, and the running cost can be reduced. Further, by adopting a main body casing made of aluminum casting, and by precisely processing the tip of the blade 16 using a high-precision machine tool, a clearance (for example, about 0.12 mm or less (for example, 0.1 mm) or less) with the arc surface 2a is obtained. 10mm-0.0
6 mm, in particular, 0.07 mm to 0.08 mm), thereby making it possible to exhibit high performance even in a supply path having a pressure difference (such as a pi-line). In this embodiment, a motor 20 (geared motor) directly connected to the shaft 7 is employed as the motor 20 for driving the rotor 10, but a motor with a driving component such as a sprocket or a chain is employed to change the rotation speed of the motor. It is also possible to make it easier.

As described above, the rotary valve 1 of the first embodiment
However, the sanitary rotary valve 101 according to the second embodiment will be described with reference to FIGS.
This sanitary rotary valve 101 is shown in FIGS.
As shown in FIG. 0, the configuration is substantially the same as that of the rotary valve 1 of the first embodiment, but has a structure in which the drive-side bearing 126 which is a single-row deep groove ball bearing can also support the shaft 107 in a cantilever manner. The inspection door 155 is connected to the side end of the face plate 102 and the driven portion side plate 104 by the hinge 150, an inspection hole 153 (see FIG. 13) is opened in the driven portion side plate 104, and the inspection door 155 is fitted in the inspection hole 153. In addition, as shown in FIG. 8, the structure can be opened and closed in the direction of the arrow indicated by the two-dot chain line, and can be fixed with screws when closed. During normal use, the inspection door 155 is inserted into the inspection hole 153.
The corner portion of the inspection door 155 can be fixed to the driven portion side plate 104 with the knob bolt 160. Therefore, since the powder transport chamber 105 (see FIG. 9) can communicate with the outside on the side, the internal inspection, disassembly, and cleaning of the sanitary rotary valve 101 can be easily performed in a short time. In addition, an inspection window 109a, which is a transparent polycarbonate disc-shaped observation window fixed so as to close the through hole 127 at the center of the driven portion side plate 104, is provided, and a side surface of the driven side edge of the shaft 107 is provided. Is provided with an identification mark 109b (see FIG. 9).
It is easy to confirm the direction of rotation of 7.

The internal structure of the sanitary rotary valve 101 will be described in detail with reference to FIG. In order to eliminate contamination (contamination due to putrefaction) of powders of foods, medicines and the like and further promote hygiene, it is necessary to enable inspection, cleaning, disassembly and the like of the inside of the sanitary rotary valve 101. Therefore, the inspection door 155 is connected to the driven part side plate 104 by the hinge 150 so that the inspection door 155 can be opened and closed, and the lid back part 1 having the tapered surface 122a protruding from the rear surface.
Reference numeral 22 denotes a structure that can be fitted into the inspection hole 153 of the driven portion side plate 104 with a tapered surface. This hinge 150 is
A driven-portion-side protruding portion 152 having an elongated hole 151 formed in a vertical direction, a hinge pin 154 inserted into the elongated hole 151 and movable back and forth, and connected to the hinge pin 154 and fixed to the inspection door 155 with a screw 156. Connecting part 157
And Further, the inspection door 155, are screwed into a plurality of mounting holes 123 (see FIG. 1 3) is provided a screw hole 142 provided in the predetermined portion of the follower plate 104 knob bolt 160 is attached (see FIG. 13) It is possible. In addition, the driven side bearing 10 which is a single row deep groove ball bearing
Numeral 6 is provided on the inner diameter surface of the through hole 127 (see FIG. 11) at the center of the inspection door 155, and an inspection window 109a made of transparent polycarbonate is fixed flush with an adhesive or the like at a predetermined portion on the outer periphery. ing. Further, a support recess 128 rotatably supported by the driven-side bearing 106 is formed in the through hole 12.
7. The support recess 128 has a recess on the right side,
A reduced diameter portion is provided on the left side. Support recess 128 and through hole 1
A ring-shaped oil seal 191 is interposed between the 27 inner walls. The right side surface of the support recess 128 has a truncated conical shape in which a conical tapered surface 161 (see FIG. 12) and a circular vertical surface 162 (see FIG. 12) are continuous.

The size of the shaft 107 is such that it can be inserted into the hollow portion 180 of the rotor 110.
A concave portion 181 is formed at the terminal end of the
The right side portion of the terminal convex portion 170 is adapted to be freely detachable.
The terminal convex portion 170 is for fixing the rotor 110 to the shaft 107 so as to be detachable, and is fixed to the shaft 107 and the rotor 110 by screws or the like. The left side surface of the terminal protrusion 170 has a truncated cone shape in which a conical tapered surface 171 (see FIG. 12) and a circular vertical surface 172 (see FIG. 12) are continuous. On the other hand, the circular vertical surface 162 of the support recess 128 described above.
Has a similar shape that is slightly smaller than the radius of the circular vertical surface 172, so that the tapered surfaces 161 and 171 can be frictionally engaged and the left end surface of the support recess 128 is completely Gap C without fitting
1 (see FIG. 12B), and the inspection door 155
A gap C2 (see FIG. 11) is formed between the right side surface (inner side surface) and the left end surface of the rotor 110 to reduce wear.

A plurality of mounting holes 173 are formed around the end protrusion 170, bolts 174 are mounted, and screwed into screw holes 175 of the rotor 110. A mounting hole 176 is formed in a central portion of the terminal convex portion 170, a bolt 177 is mounted, and screwed into a screw hole 178 formed in a central portion of the shaft 107. Parallel key 1
79 is the inner peripheral surface of the hollow portion 180 of the rotor 110 and the shaft 1
07, which is interposed between the outer peripheral surface of the right end portion and the outer peripheral surface of the shaft 107 to prevent idling and transmits the rotational drive of the shaft 107 to the rotor 110.

A sealing ring 193 made of Teflon and a ring-shaped oil seal 19 are provided between the inner wall of the through hole 130 of the driving part side plate 103 and the outer peripheral surface of the driving side end of the shaft 107.
4. A drive side bearing 126 which is a single row deep groove ball bearing is interposed and fixed by a bearing retainer 134.
A motor shaft fixing hole 1 is provided at the center of the right end of the shaft 107.
99 is opened, and the drive shaft of the motor 120 (see FIGS. 7 and 8) is connected. Shaft cover 12 of motor 120
1 is a cover 131 of the drive unit side plate 103 and a bolt 132
Are connected by Connection box 125 to motor 120
(See FIGS. 7 and 8).

The sanitary rotary valve 101 described above is, as shown by a two-dot chain line in FIG.
Knob bolt 160 is removed, when the inspection door 155 is opened, the disengaged support recess 128 from the terminal protrusion 170, motor 12 0 and the drive-side bearing 126 is structured to cantilevered shaft 107, the shaft 10 7
And termination convex portion 170 by the weight of the rotor 110 sag downward, the clearance between the rotor 110 and the face plate 102 although error occurs, no effect because not in operation. When the bolt 177 is removed, the rotor 110
Can be removed from the shaft 107 and passed through the inspection hole 153 to the outside, which makes it easier to perform internal inspection and cleaning. On the other hand, in the case of operation, when the inspection door 155 is closed in the reverse procedure, the terminal convex portion 170 and the support concave portion 128 are guided along the tapered surfaces 161, 171 and are forcibly fitted. The inspection door 155 is fixed to the driven part side plate 104 by the knob bolt 160, and both ends of the shaft 107 are supported. Therefore, when the inspection door 155 is closed, the hanging of the shaft 107 is eliminated, and the accuracy of the clearance is forcibly secured. In this state, when the motor 120 drives the shaft 107, the terminal protrusion 170 and the support recess 128 rotate integrally by frictional engagement, and the shaft 107 is properly supported by the both-ends support structure, and the rotor 110 and the face plate 102 are supported. The supply of the powder is performed while maintaining the accuracy of the clearance. The second
Since other configurations of the embodiment are the same as those of the first embodiment, the corresponding part numbers are illustrated in the hundreds and the description is incorporated.

The effect of the sanitary rotary valve 101 of the second embodiment is substantially the same as that of the first embodiment. However, the effect unique to the present embodiment is that the rotation state or the rotation direction of the rotor 110 is different. In addition, the sanitary control is facilitated by making the driven part side plate 104 freely openable and closable, especially in the food and pharmaceutical industries where sanitary properties are required, and in applications that frequently change the type of transported goods. Can be supported.

A rotary valve 201 according to a third embodiment will be described with reference to FIGS. The rotary valve 201 has substantially the same configuration as that of the first embodiment. However, the height and width of the rotary valve 201 are set to standard dimensions, and the length of the face plate 202 and the length of the rotor 210 are changed according to a required discharge capacity ν. By doing so, the powder supply / discharge amount Q can be changed (see the above-mentioned equation (1)), and the production efficiency is remarkably improved. further,
The drive unit side plate 203 and the driven unit side plate 204 are provided with air purge ports 241 and 242 (see FIG. 15) so that the powder can be smoothly delivered. Since other configurations of the third embodiment are the same as those of the first embodiment, the corresponding part numbers are shown in the 200s and the description is referred to, and mainly the characteristic configuration will be described.

As shown in FIG. 14, in the rotary valve 201, assembled parts such as a face plate 202, a drive unit side plate 203, a driven unit side plate 204, a rotor 210, and the like are made of aluminum and are made of aluminum. The standardization of the shape and material is also achieved by standardizing the parameters.
The drive unit side plate 203 and the driven unit side plate 204 are made of cast aluminum, and the face plate 202 and the rotor 210 are manufactured by extrusion molding and cut into a desired length to obtain a desired capacity, that is, the above-mentioned (1). The supply and discharge amount Q of the formula can be easily obtained, the production efficiency is remarkably improved, and the weight reduction is achieved without increasing the production cost.
That is, the face plate 202 and the rotor 21 in various sizes are provided.
By tightening the “0” in a sandwich shape between the drive unit side plate 203 and the driven unit side plate 204 whose size is standardized, the light weight rotary valve 201 having a different processing capacity can be easily manufactured.

The drive unit side plate 203 and the driven unit side plate 204
In order to shorten the distance of the piping, the side plates are made thicker, and air purge ports 241 and 242 are provided inside in the plate surface direction. In this configuration, high-pressure air is introduced from the outside into the space between the driven-side bearing 206 and the driving-side bearing 226, which are single-row deep-groove ball bearings, so that an air seal is formed in the gap between the powder-transporting chamber 205.

As described above, the rotary valve 201 of the third embodiment has substantially the same effects as those of the above-described embodiment, but a unique effect of the present embodiment is that the face plate 202 extruded according to the required capacity. And rotor 210
Adjusting the length and assembling other standardized parts makes it easy to manufacture. As a result, high-mix low-volume production can be performed without stocking surplus parts, so that not only the production cost can be significantly reduced, but also the parts cost can be kept low, so that the running cost in the powder factory can also be reduced. Further, the inflow of the powder is blocked by the air purge ports 241, 242, so that damage to the bearing can be prevented.

A rotary valve 301 according to a fourth embodiment will be described with reference to FIGS. This rotary valve 301 has substantially the same configuration as that of the third embodiment, but is provided with a relaxation garter 370 so as to smoothly feed powder, and is further provided with an air blowing pipe 380 to form an air curtain. , To improve the efficiency of powder transportation. The air purge is refined by the air purge mechanisms 390 and 399. Since other configurations of the fourth embodiment are the same as those of the third embodiment, the corresponding part numbers are illustrated as 300s and the description is incorporated by reference.
Mainly, a characteristic configuration will be described.

As shown in FIG. 17, in the rotary valve 301, a relaxation garter 370, which is an arc-shaped long groove, is formed on the outer surface of the driven portion side plate 304 of the face plate 302. As shown in FIGS. 17 and 19, the relaxation garter 370 is covered with a disk-shaped cover 372, and has a structure in which air is released from the return-side trough 317a to the supply-side trough 317b. In addition, the air pressure (positive pressure) on the return side can be reduced. When powder is transported from below the rotary valve 301, the pressure at the powder supply port 311 of the rotary valve 301 is atmospheric pressure, but the pressure at the powder discharge port 312 increases, and the powder is supplied from the powder discharge port 312. Although there are inconveniences such as air escaping through the gap to the port 311, the difference between the pressure of the powder discharge port 312 and the pressure of the powder supply port 311 can be reduced by the relaxation garter 370. As a result, the amount of air that escapes upward can be reduced, the pressure at the powder discharge port 312 can be maintained, and there is an effect that the powder can be transported smoothly. Further, the appearance is improved by eliminating the need for hose piping.

Further, the air outlet pipe 3 having the slit formed therein.
19 is provided at a position on the return side of the powder discharge port 312, and FIG.
By forming an air curtain in the direction of arrow W, the efficiency of powder transportation is improved. Also, the air outlet pipe 380
Is rotatable, and can be rotated by a motor (not shown) or manually to blow out air in a desired direction such as an upward direction at the time of maintenance, thereby cleaning powder adhered to the rotor 310 and the like. it can.

An air purge mechanism 390 is provided on the drive section side plate 303.
Is provided. The air purge mechanism 390 prevents the powder from leaking from the gap of the shaft 307, and prevents the powder from entering into the seal housing that houses the driving-side bearing 326 and the ring-shaped oil seal 391 provided around the inside. This is provided with an air purge ring 392 provided inside the oil seal 391, and an air purge port 393 (see FIG. 18) communicating with the air purge ring 392. By ejecting air from the air purge port 393, an air seal is formed.
Similarly, the oil seal 39 is attached to the driven portion side plate 304.
4, an air purge ring 395 provided inside the air purge ring 395, and an air purge port 396 communicating with the air purge ring 395.
Although an air purge mechanism 399 including (see FIG. 18) is provided, the description of the air purge mechanism 390 is referred to.

As described above, the rotary valve 301 according to the fourth embodiment is substantially the same as the above-described embodiment in terms of the effect. However, by preventing the intrusion of the powder by the oil seal 394, the powder is placed on the back surface of the inspection window 309a. Since the body does not adhere, the rotation direction can be always checked. As an effect peculiar to the present embodiment, by reducing the air pressure of the powder discharge port 312 by the relaxation garter 370, the powder transport efficiency is improved. The efficiency of powder transportation can be increased by the air blowing pipe 380, and the inside can be cleaned at the time of maintenance. The air purge mechanisms 390, 399 can prevent powder from entering the seal housing.

A rotary valve 501 according to a fifth embodiment will be described with reference to FIGS. The rotary valve 501 has substantially the same configuration as that of the fourth embodiment, but includes a shaft cover 509 and a driven portion side plate 504.
The shaft cover 509 is detachable by twisting (turning), and the clearance between the rotor 510 and the wall surface of the driven portion side plate 504 in the thrust direction of the shaft 507 can be adjusted. Things.
Since other configurations of the fifth embodiment are substantially the same as those of the fourth embodiment, the corresponding part numbers are illustrated and described as the 500s, and description and illustration are appropriately referred to, and mainly the characteristic configuration will be described. . A step portion 509b is formed on the inner surface of the circular shaft cover 509, and a female screw 509c is cut in a left region of the step portion 509b. A portion near the center of the inner surface of the shaft cover 509 also serves as a bearing 506. Multiple (here, four) holes 509d in the axial direction
And two screw through holes 509 e are formed, and the driven portion side plate 5 is formed.
A step 504c is formed on the outer peripheral surface of the projecting portion 504b of FIG. 04, and a male screw 504d is provided on the outermost peripheral portion of the step 504c. Step 50
9b and the step portion 504c are fitted to each other, so that the driven portion side plate 5
04 is detachable.

First, when attaching the shaft cover 509, a pin wrench is hooked on the hole 509d, and the shaft cover 509 is turned to be screwed into the driven portion side plate 504. By adjusting the degree to which the bearing 506 and the shaft 507 are pressed, the clearance in the thrust direction of the shaft 507 can be adjusted. When the clearance can be confirmed with a clearance gauge (not shown), the holding bolt 509f is screwed into the screw through hole 509e, and is turned in a direction opposite to the screwing direction (FIG. 2).
1 left direction), that is, the shaft cover 509
By separating from the protruding portion 504b, the screw is fixed, and the shaft cover 509 is not loosened.
That is, the screw is tightened by the separating force. After the assembly is completed, the tapered pins 50 are provided at a plurality of locations (here, four locations).
4e to prevent displacement due to impact.

[0032] The present invention is not limited to the shape condition of the embodiment described above, At a range not departing from the technical idea of the present invention are those capable of making modifications and the like,
Such modifications and equivalents are also included in the technical scope of the present invention.

[0033]

According to the first and second aspects of the present invention, it is possible to easily check the rotation direction and the like of the rotor of the rotary valve.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing a rotary valve according to a first 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 line AA of FIG. 1;

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

FIG. 7 is a partially broken front view showing a sanitary rotary valve according to a second embodiment of the present invention.

FIG. 8 is a plan view showing the sanitary rotary valve.

FIG. 9 is a left side view of the sanitary rotary valve.

FIG. 10 is a sectional view taken along line XX of FIG. 7;

FIG. 11 is an enlarged cross-sectional view of the sanitary rotary valve on a driven portion side.

FIGS. 12A and 12B are explanatory views showing how the inspection window of the sanitary rotary valve is fitted and removed.

FIG. 13 is a left side view of the sanitary rotary valve with an inspection door open.

FIG. 14 is a front view showing a rotary valve according to a third embodiment of the present invention.

FIG. 15 is a partially broken plan view showing the rotary valve.

FIG. 16 is a left side view of the rotary valve.

FIG. 17 is a partially broken front view showing a rotary valve according to a fourth embodiment of the present invention.

FIG. 18 is a partially broken plan view showing the rotary valve.

FIG. 19 is a left side view of the rotary valve.

FIGS. 20 (a), (b) and (c) are explanatory views of the rotor shape of a rotary valve.

FIG. 21 (a) is an enlarged sectional view of a shaft end of a driven portion side according to a fifth embodiment, and FIG. 21 (b) is an enlarged sectional view of a shaft cover.

FIG. 22 is a left side view of the same embodiment.

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65G 65/30-65/48 B65G 53/00-53/28 B65G 53/32-53/66

Claims (2)

(57) [Claims] 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 powder is transferred from the powder supply port to the powder transport chamber by rotating the rotor. A rotary valve that feeds the powder to the powder discharge port, wherein the casing includes a driving unit side member and a driven unit side member, and the shaft is supported by a bearing provided in a through hole of the driving unit side member and the driven unit side member. A rotary valve, wherein a motor is connected to the driving unit side member, and an inspection window is provided in a through hole of the driven unit side member. 2. The rotary valve according to claim 1, wherein the inspection window includes a transparent member, closes the through hole, and has an edge processed at an end of the rotor.