JP3357040B2 - Rotary valve and pressure feed adapter - 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 transporting powder and a pressure adapter.

[0002]

2. Description of the Related Art Standard type rotary valves are mainly used in places with a small pressure difference, such as bag filters, tanks, screw conveyors, etc., and there are also types in which the clearance is set relatively wide. . As is well known, the structure is such that the rotor rotates to supply a fixed amount of powder from top to bottom.

The pneumatic transport standard type rotary valve is mainly used under a receiver, a cyclone and the like in the pneumatic transport type pneumatic transport. In order to discharge only the conveyed powder and granules while shutting off the air, an air lock or a rotary valve is used. Also called an air locker. The clearance between the rotor and the casing is set to be extremely narrow, and the labyrinth seal is used. This is used when there is a pressure difference, for example, when there is a pressure difference between the upper hopper and the lower hopper.

[0004] The pneumatic transport once-through rotary valve has been developed exclusively for the source (server) of pneumatic transport.
This is a blow-through type in which the blower and the transport pipe are directly attached to the main body, and the powder is transported by the blower, and the clearance is set relatively narrow.

However, in the prior art described above,
When a high-concentration low-speed transport unit is mounted on the discharge side of the rotary valve and used, for example, a turbulent flow region may be generated and pulsation may be disturbed.

[0006]

SUMMARY OF THE INVENTION Accordingly, the invention described in claims 1 to 4 is intended to suppress a turbulent flow region and form a clean pulsation when a high-concentration low-speed transport section is mounted on a rotary valve and used. It is intended for.

[0007]

In view of the above problems SUMMARY OF THE INVENTION The invention of Claim 1 wherein is connected to the lower portion of the rotary valve casing, comprising a pumping adapter having an air transporting channel, the compressed air blowout portion of the pumping Adapter It is characterized by performing high-concentration low-speed powder transport in which high-speed low-speed transport is performed while maintaining a high mixing ratio of powder and air by using a compressor as an air source machine by providing an air blowing slit in the horizontal direction, The inside of the pressure feeding adapter includes a charging hopper communicating with a powder discharge port of the rotary valve casing, and a connection pipe integrally attached to the charging hopper, and a compressor connection unit is mounted on the back side of the charging hopper. , Wherein the compressor is connected to the compressor connection unit to serve as an air source for pneumatic transportation. Is Ribarubu. As a result, the turbulence region is greatly reduced, such as when the high-concentration low-speed transport unit is mounted on the discharge side of the rotary valve and used.
A clean pulsation can be formed, and the above problem can be solved.

The rotary valve referred to herein is a casing having a powder transfer chamber provided with a powder supply port and a powder discharge port in the vertical direction, a shaft rotatably disposed in the casing, And a rotor that radially has a plurality of blades to partition the powder transport chamber, and that sends out powder by rotating the rotor.

According to a second aspect of the present invention, there is provided an air transport portion having an air transport passage connected to a lower portion of a rotary valve casing, and an air blow slit is provided in a pressure air blow portion of the air transport portion in a lateral direction. The air source machine
Use a resin to maintain a high mixing ratio of powder and air
Characterized by performing high-concentration low-speed powder transport to transport at low pressure at high pressure, while the powder of the rotary valve casing
An input hopper communicating with the discharge port and integrated with the input hopper
A connecting pipe attached to the back of the charging hopper.
The compressor connection unit is attached to the
Connect the compressor to the connection
A pressure adapter adapted to be used as an air source for transportation .

[0010]

[0011]

[0012]

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. This rotary valve 1 is connected to an air source machine by a blower (not shown).
The present invention is applied to a low-concentration high-speed transport system in which a high-speed transport is performed at a low pressure while maintaining a low mixing ratio of powder and air by attaching a pressure adapter 51 at a lower portion. As shown in FIG. 1, the rotary valve 1 has a casing 2 composed of a pair of substantially tile-shaped face plates having an arc surface 2 a (see FIG. 2) inside thereof, and the casing 2 orthogonal to the drive unit side. Bolt 3a (see FIG. 6)
The drive unit side plate 3 whose ends are connected to each other, the driven unit side plate 4 whose ends are connected to each other by bolts 4a (see FIG. 2) orthogonal to the driven unit side of the casing 2, the casing 2 and the drive unit side plate 3 The powder transport chamber 5 (see FIGS. 2 and 5) surrounded by the driven part side plate 4, the driven side bearing 6 fixed to the driven part side plate 4, and the inside of the powder transport chamber 5. A shaft 7 made of stainless steel rotatably mounted on the driven bearing 6, a transparent polycarbonate shaft cover 9 attached to the driven bearing 6 via bolts 8, and fixed to the shaft 7. And the rotor 10. The shaft 7 is a motor 20
(Geared motor) and a driving member connected to the driving shaft of a motor 20 by a connecting member (not shown) such as a key.
1 is connected to the cover 31 of the drive unit side plate 3 by bolts 32.

The dimensions and the like of the rotary valve 1 are determined so as to obtain a desired supply / discharge amount Q (t / h). The supply / discharge amount Q (t / h) is determined from the following rotary valve discharge formula. The shape and dimensions of the rotary valve 1 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 powder transport chamber 5 communicates with a rectangular powder inlet 11 and a rectangular powder outlet 12 formed at the upper and lower portions, respectively. That is, an opening 11 is formed on the upper surface of the rotary valve 1 for introducing a powder, and an inlet connection surface 13 (see FIG. 1) on the upper surface of the casing 2 to which a powder device (not shown) on the upstream side is connected. 3)
Are provided, and a plurality of screw holes 13a (see FIG. 3) 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 opened, 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. A bolt 14b (see FIG. 2) is screwed into the screw hole 14a, and a pressure feeding adapter 51 is fixed to a lower portion of the rotary valve 1.

When viewed from the side, as shown in FIG. 5, the rotor 10 includes a cylindrical tubular portion 15 and a plurality of blades 16 extending radially from the tubular portion 15 in a radial direction. The body transport chamber 5 is partitioned, and the trough 1 is
7 is formed. The shaft 7 is fitted into the center hole of the cylindrical portion 15 and the driving force of the motor 20 causes the arrow A
It is rotatable integrally with the shaft 7 in the direction. As a result, the powder input from the powder input port 11 is transported by the trough 17 as the rotor 10 rotates,
The powder is discharged from the powder outlet 12 to the downstream side. The shape of the tip of the blade 16 is a crystal cut 18 with improved wear resistance.

The pressure feeding adapter 51 is supplied with pressurized air from a blower (not shown) serving as an air source into the pressure feeding adapter 51 formed in a tubular block, and maintains a low mixing ratio of powder and air while maintaining a low mixing ratio. It has a low-concentration high-speed transport structure for high-speed transport at low pressure. A feeding chute 52 communicating with the powder discharge port 12 and connection pipes 53 connected to both ends of the feeding chute 52 are attached inside the pressure feeding adapter 51. The pressure feeding adapter 51 connects a blower (not shown) to one of the connection pipes 53 and connects a pipeline (not shown) to the other. An air outlet pipe 80 is attached to the inside of the powder outlet 12 of the casing 2 from the drive unit side plate 3 to the driven unit side plate 4.
Slits 81 are continuously provided in the pipe wall of the air blowing pipe 80 in the horizontal direction, and pressurized air introduced from outside through a pipeline or the like is used to diagonally lower the inner side of the powder outlet 12 in the downward oblique direction W.
(See FIGS. 9 and 10) to form an air curtain. In addition, this air blowing pipe 80
It is attached to the driving unit side plate 3 and the driven unit side plate 4 via bearings 19a and 19b, and can be rotated manually or by a motor (not shown). In addition,
The position and shape of the slit 81 can be appropriately adopted depending on the pressure of air, the cross-sectional area of the flow path, and the like. For example, slit 8
It is also possible to form 1 intermittently.

The casing 2, the drive unit side plate 3, the driven unit side plate 4, the rotor 10, and the pressure adapter 51 are made of corrosion-resistant aluminum that has been subjected to a hard surface treatment of aluminum, for example, a mite treatment.

According to the rotary valve 1 described above, the powder dropped from the powder discharge port 12 to the charging chute 52 is supplied to the inside of the pressure feeding adapter 51, and is pressure-fed to the pipeline via the connection pipe 53, and is pressure-fed. When connecting a blower or the like to the adapter 51 to perform low-concentration high-speed transportation (a method in which the mixing ratio of powder and air is reduced and high-speed transportation is performed in a low-pressure state), the pressure near the powder discharge port 12 is reduced by an air curtain. , The air discharged from the blower (not shown) does not affect the vicinity of the powder discharge port 12 so that the powder can be discharged more smoothly. In addition, since air blown out from a blower (not shown) is pressed from above by the above-described air curtain, pneumatic transportation is facilitated. Further, air is replenished to the trough 17 that has been emptied by discharging the powder, so that the trough 17 is blown up by the wind pressure of the air, and the loss is replenished so that the air volume of the air entering the rotor 10 is not reduced. Further, since the air blowing pipe 80 is rotatably mounted around the axis, the air blowing angle can be changed upward after the process is completed, and the air can be blown out at an appropriate angle to clean the rotor 10 and the like. . Further, since the height of the pressure feeding adapter 51 can be reduced as much as possible and the overall height can be reduced, the entire apparatus becomes compact and installation in a flour mill or the like becomes easy.

A rotary valve 201 according to a second embodiment will be described with reference to FIGS. This rotary valve 201 has a configuration substantially similar to that of the first embodiment,
A high pressure feeding adapter 251 is attached to the lower part of the rotary valve 201, and a high concentration is used to transport the powder and air at a low speed while maintaining a high mixing ratio of powder and air using a compressor (not shown) as an air source machine. This is applied to the low-speed transportation system.

This rotary valve 201 has its height and width as standard dimensions, and according to the required discharge capacity ν,
By changing the lengths of the casing 202 and the rotor 210, the powder supply / discharge amount Q can be changed (see the above-mentioned formula (1)), and the production efficiency is remarkably improved. Further, the drive unit side plate 203 and the driven unit side plate 2
Reference numeral 04 denotes a port provided with an air purge port (not shown) for smoothly feeding the powder. Since other configurations of the second 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. 8, in the rotary valve 201, assembling parts such as a casing 202, a driving part side plate 203, a driven part side plate 204, a rotor 210 and the like are made of aluminum, and the height and width thereof are made uniform. The standardization of the shape and the material is also achieved by standardization. The drive unit side plate 203 and the driven unit side plate 204 are made of cast aluminum, and the casing 202 and the rotor 210
Is manufactured by extrusion molding and cut into a desired length, so that the desired capacity, that is, the supply / discharge amount Q of the above-described formula (1) can be easily obtained, and the production efficiency can be significantly improved. In addition, the weight is reduced without increasing the manufacturing cost. That is, the casing 202 and the rotor 210 of various sizes are sandwiched between the driving unit side plate 203 and the driven unit side plate 204 having a standardized size, so that the weight of the rotary valve 201 is reduced. 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 293 and 296 are respectively provided in the plate surface direction. This is such that air is introduced from the outside into the space inside the driven-side bearing 206 and the drive-side bearing 226 (see FIG. 11) to form an air seal in the gap between the powder-transporting chamber 205 and the air-purge mechanism. .

As shown in FIGS. 9 and 16, the rotary valve 201 is connected to the driven portion side plate 20 of the casing 202.
4 is an arc-shaped long groove on the outer surface of the garter 270 for relaxation.
The loosening garter 270 is provided with an inlet communication hole 271 and an outlet communication hole 272 at the ends, respectively, so that it can communicate with the powder transport chamber 205. Further, the surface of the relaxation garter 270 is covered with a disk-shaped cover 273 (see FIG. 11), and is shielded from outside air. In the drawing, as indicated by a dotted arrow, the air is communicated from the trough 217a on the return side to the trough 217b on the supply side to escape, and the air pressure (positive pressure) on the return side can be reduced. This relaxation garter 2
70, when powder is transported from below the rotary valve 201, the pressure at the powder inlet 211 of the rotary valve 201 is atmospheric pressure, but the pressure at the powder outlet 212 increases, Although there is an inconvenience such that air escapes through the gap to the powder inlet 211, the difference between the pressure of the powder outlet 212 and the pressure of the powder inlet 211 is reduced by the relaxation garter 270. Can be
As a result, the amount of air that escapes in the upward direction can be reduced, the pressure at the powder outlet 212 can be maintained, and the powder can be transported smoothly. Further, the appearance is improved by eliminating the need for hose piping.

As shown in FIGS. 12 (a) and 12 (b), a slit 281 is formed obliquely downward in the lower half of the pipe wall of the air blowing pipe 280, and the pipe joint 28 is formed at the left end.
3 is connected so that compressed air can be supplied. Although the slit 281 is provided continuously and horizontally, it may be partial or intermittent, and various modifications may be made to achieve the same function as the air curtain. An air blowing pipe 280 is provided at a position of the powder discharge port 212 on the return side of the rotor 210, and an air curtain is formed in the direction of arrow W (obliquely downward) in FIG. is there. Further, the air blowing pipe 280 is rotatable, and is rotated by a motor (not shown) or manually, so that air is blown out in a desired direction such as an upward direction at the time of maintenance, so that powder adhering to the rotor 210 or the like is discharged. The body can be washed. In addition, the gap of the slit 281 is not limited to the illustrated one, and can be set to an appropriate width.

The drive side plate 203 is provided with an air purge mechanism. The air purge mechanism prevents leakage of powder from a gap in the shaft 207 and prevents powder from entering into a seal housing that houses the drive-side bearing 226 and an oil seal 291 provided around the drive-side bearing 226. It has an air purge ring 292 provided inside the oil seal 291, and an air purge port (not shown) communicating with the air purge ring 292. By blowing air from an air purge port (not shown),
An air seal is formed. Similarly, the follower side plate 2
04, an oil seal 294, an air purge ring 295 provided inside the oil seal 294, and a second air purge mechanism including an air purge port (not shown) communicating with the air purge ring 295 are provided. Invite explanation.

As shown in FIG. 7 and FIG.
1 is an input hopper 2 communicating with the powder discharge port 212.
52 and a connection pipe 253 integrally attached to the input hopper 252. A compressor connection unit 254 is mounted inside the pressure feeding adapter 251 on the back side of the charging hopper 252, and a compressor (not shown) is connected to the compressor connection unit 254 to serve as an air source for air transportation. I have. The compressor connection unit 254 includes an air blowing portion 255 which is formed of a pipe and connected to a pipe joint at one end and closed at the other end. This air blowing part 255
In the figure, a slit 256 (see FIG. 9) arranged in the lateral direction is provided below.

The rotary valve 201 of the second embodiment
Is generally similar in effect to the previous embodiment,
As an effect unique to the present embodiment, the garter 270 for relaxation is provided.
As a result, the air pressure at the powder outlet 212 is reduced, thereby improving the powder transport efficiency. Air outlet pipe 28
With 0, the powder transportation can be made more efficient, and the inside can be cleaned during maintenance. The air purge mechanism can prevent powder from entering the seal housing. In addition, a fine pulsation can be created by pressing the powder flow that falls from the charging hopper 252 and becomes a plug-shaped pulsating flow from above with an air curtain. In addition, since the outlet of the compressor connection unit 254 that supplies a high pressure to the inside of the pressure feeding adapter 251 is formed as the slit 256, FIG.
(A), FIG. 14 (a), and FIG. 13 (b) in comparison with the air blowing from a simple cylindrical cross section 260 ′ (see FIG. 13 (a)) shown as a comparative example. ), FIG.
As shown in FIG. 4 (b) and FIG. 15 (b), the turbulent flow region is limited to the bottom portion, and no turbulent flow is generated on the side surface and the upper surface, so that a clean pulsation can be produced, which can contribute to an improvement in transport efficiency. . It should be noted that the comparative example is distinguished from the present embodiment by adding a dash to the same number as the present embodiment.

A rotary valve 301 according to a third embodiment will be described with reference to FIGS. The rotary valve 301 has substantially the same configuration as that of the first embodiment, except that a cylindrical groove 380 is formed in the lower part of the inside of the casing 302 instead of the air blowing pipe 80, and the cylindrical groove 380 is formed obliquely downward toward the edge from here. A slit 381 is formed, opened to the powder discharge port 312, a joint 383 is connected to the above-described cylindrical groove 380, and compressed air is supplied from an air source (not shown). The air curtain is ejected diagonally to form an air curtain. The powder inlet 311 is formed in the left half and the powder outlet 312 is formed in the right half, so that they are eccentrically arranged. Note that another configuration of the third embodiment is the first configuration.
Since the same as the embodiment, the corresponding part number is 3
The figures are shown as 00s and the description is incorporated.

The rotary valve 301 of the third embodiment
Is generally similar in effect to the previous embodiment,
As an effect peculiar to the present embodiment, by eliminating the need for an air blowing pipe, the configuration is simplified, and mounting is not required.
There is an advantage that the manufacturing process can be simplified.

It should be noted that the present invention is not limited to the above-described embodiment, but may be modified 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.

[0031]

According to the first and second aspects of the present invention, a turbulent flow region is suppressed and a clean transport flow can be generated.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing a state in which a pressure feeding adapter is attached to a rotary valve according to a first embodiment of the present invention.

FIG. 2 is a left side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a bottom view showing the rotary valve.

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

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

FIG. 7 is a partially broken front view showing a rotary valve according to a second embodiment.

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

FIG. 9 is a side view of the rotary valve as viewed from a driven side.

FIG. 10 is a partially broken side view of the rotary valve as viewed from a driving side.

FIG. 11 is a partially broken front view showing a rotary valve according to a second embodiment of the present invention.

FIG. 12 (a) is an enlarged front view of the air outlet of the compressor connection unit of the rotary valve according to the present embodiment, and FIG. 12 (b) is a partially enlarged side view of the same.

13A is a side view illustrating the operation of the rotary valve of the comparative example, and FIG. 13B is a side view illustrating the operation of the rotary valve of the present embodiment.

14A is a front view illustrating the operation of the rotary valve of the comparative example, and FIG. 14B is a front view illustrating the operation of the rotary valve of the present embodiment.

FIG. 15A is a plan view showing the operation of a rotary valve (pressure feeding adapter part) of a comparative example, and FIG. 15B is a plan view showing the action of the rotary valve (pressure feeding adapter part) of the present embodiment.

16A is a cross-sectional view of a rotary valve casing in the vicinity of a relaxation garter, and FIG. 16B is a vertical cross-sectional view of the same.

17A is a side view of a rotary valve according to a third embodiment, and FIG. 17B is a bottom view of the rotary valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary valve 2 Casing 2a Arc surface 3 Drive side plate 3a Bolt 4 Follower side plate 4a Bolt 5 Powder transport chamber 6 Follower bearing 7 Shaft 8 Bolt 9 Shaft cover 10 Rotor 11 Powder inlet 12 Powder outlet 13 Port connection surface 14 Discharge port connection surface 15 Cylindrical part 16 Blade 17 Trough 18 Crystal cut 20 Motor 21 Shaft cover 31 Cover 32 Bolt

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

Claims (2)

(57) [Claims] 1. A is connected to the lower portion of the rotary valve casing, comprising a pumping adapter having an air transport passage, provided with a air blowing slits in the transverse direction to the pressure air outlet portion of said pumping adapter, the compressor air source machine Use, characterized by performing high-concentration low-speed powder transportation to transport at a high pressure and low speed while maintaining a high mixing ratio of powder and air, the inside of the pressure feeding adapter, to the powder outlet of the rotary valve casing An air source for pneumatic transportation, comprising: a communication input hopper; and a connection pipe integrally attached to the input hopper, wherein a compressor connection unit is mounted on the back side of the input hopper, and the compressor is connected to the compressor connection unit. A rotary valve, characterized in that: 2. Connected to the lower part of a rotary valve casing
A pneumatic transport section having an air transport passage, wherein a pneumatic blowing slit is formed in a pressure air blowing section of the pneumatic transport section.
In the direction,Using a compressor for the air source machine,
High-pressure and low-speed transport while maintaining a high mixing ratio of air and air
High density low speed to sendIt is characterized by carrying powderAnd Communicating with the powder outlet of the rotary valve casing
Input hopper, and integrally attached to the input hopper.
A connection pipe is provided, and a compressor is
The compressor connection unit is attached,
To connect the compressor to the
It is characterized by Pumping adapter.