JPH0432368Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a non-contact seal type rotary valve that seals a rotating part without using a seal member.

(Prior Art) Currently, a sealing member such as metal, synthetic resin, or other material is interposed in the rotating part of a rotary valve, and sealing is achieved by pressing the sealing member against the rotating part.

(Problems to be solved by the invention) In the conventional rotary valves described above, the rotating part is sealed with a sealing member, so there is a risk that the conveyed object and the sealing member will come into direct contact, and the sealing member will wear out. There is a risk of contamination with the transferred material, and this is not a preferable sealing method from a hygienic standpoint.

Especially when handling pharmaceutical products, GMP (Good
It is difficult to use conventional rotary valves because they must be manufactured according to manufacturing practices (standards for manufacturing and quality of pharmaceutical products).

The present invention has been made to solve the above technical problems.

(Purpose of the invention) The purpose of the invention is to eliminate the sealing by the sealing member, eliminate contact between the transported object and the sealing member, and eliminate contamination of the transported object with worn objects from the sealing member, thereby achieving hygienic transportation. To provide a non-contact seal type rotary valve which can be easily obtained and also simplified in structure.

(Means for Solving the Problems) In order to solve the above-mentioned technical problems and also achieve the above-mentioned objectives, the present invention provides a drive shaft for rotating the rotor and a drive shaft insertion hole of the housing that houses the rotor. It was designed to supply pressurized air to the gap between the two.

(Operation by the above means) According to the above means, instead of the necessary sealing member around the rotor drive shaft, pressurized air is supplied to this area, and the pressurized air is applied to the housing housing the rotor, so that the rotor is transported by the rotor. The transferred objects do not enter between the shaft hole or the rotor boss and the housing, and while the rotating parts are sealed, the transferred objects are prevented from entering the rotating parts and flowing out to the outside. There are no cases of contamination with wear materials. Therefore, the clean state of the transferred items can be maintained, hygienic transfer of the transferred items can be performed, and it can also be used in the processing and transfer processes of pharmaceuticals. and seal member,
The structure is simplified because no holding or pressing mechanism is required.

(Embodiment) Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional side view of the first embodiment, and FIG. 2 is a front view thereof.

Reference numeral 1 designates a casing, which is provided with a raw material input port 2 at the top and a raw material discharge port 3 at the bottom. is provided with flange portions 4a and 5a for connection with other equipment. A circular space 6 is provided between the cylindrical parts 4 and 5, and one side, for example, the back side, is covered with a disk-shaped rear wall 7.

An annular flange portion 8 projecting outward is integrally provided on the outer periphery of the back of the rear wall 7, and a shaft insertion hole 9 penetrating in the thickness direction is provided in the center portion of the rear wall 7 surrounded by the flange portion 8. The opposite side of the rear wall 7, that is, the front side, is open 10.

A drive unit 11 consisting of a drive motor 12 and a speed reducer 13 is placed on the outside of the back of the rear wall 7.
A flange portion 14 is provided at the end of the reducer 13, and a peripheral end surface 14a of the flange portion 14 is connected to an end surface 8a of the flange portion 8.
bolt 15... through the mounting hole 14b.
The flange portions 14 and 8 are bonded together. The output drive shaft 16 is introduced through the reduction gear 13 of the motor 12 into the center of the space 6 through the insertion hole 9 of the rear wall 7, and the shaft 16 has a smaller diameter than the inside diameter of the insertion hole 9 and has a diameter between the outer circumference of the shaft and the inside of the hole. A gap S is formed between the periphery and the periphery.

The rotor 17, which forms the main part of the rotary valve, has a shaft-shaped boss part 18 in the center as shown in FIG.
Blades 19 are protruded radially from the outer periphery of this, and the transfer space 2 is partitioned between the blades 19.
0... is provided. The outer diameter of the blades 19 is set so as to fit tightly and slidably into the inner diameter of the space 6, and the blades 19 are inserted into the space 6 from the opening 10 on the front side of the rear wall 7 opposite to the drive unit 11. Fits in. The boss portion 18 is provided with a shaft mounting hole 21 that is open rearward in the axial direction, and the drive shaft 16 is fitted into the shaft mounting hole 21, and the shaft 16 and the boss portion are connected using a key (not shown), a screw, a screw in the radial direction, or the like (not shown). 18.

A cover 22 serving as a lid faces the opening 10, and the cover 22 is larger than the opening 10.
It is connected to the periphery of the open portion 10 with bolts 23 .

In the above, a sealed chamber 24 surrounded by the outer rear surface of the rear wall 7 and the flange portion 8 and the flange portion 14 of the reducer 13 is formed. room 24
is connected to the pressurized air supply line 26 through the pressurized air introduction hole 25 provided at the lower part of the flange portion 8, and the line 26
is connected to a pressure source (not shown) via a valve 27.

As a result, pressure air is supplied into the chamber 24 via the line 26 and the introduction hole 25, and since the chamber 24 is connected to the gap S between the insertion hole 9 and the shaft 16, the pressure air can flow into the gap S. On the other hand,
The material to be transferred is put into the transfer space 20 defined by the blades 19 of the rotor 17 from the input port 2, and is discharged by the rotation of the rotor 17 so as to face the discharge port 3. It flows into the base of the transfer space 20 from the sliding clearance between the end surface of the boss portion 18 and the rear wall 7 . Therefore, the sealing between the shaft 16 and the hole 9 is performed by air pressure, and the transfer space 2
0 is prevented from flowing out from the clearance between the shaft 16 and the hole 9.

FIG. 3 is a longitudinal side view showing the second embodiment, in which the same parts as in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, an air motor 112 is used as the drive unit 111, and a flange portion 114 at the end of the air motor 112 is used.
The peripheral portion of the housing 1 is connected via bolts 15 to the end surface of an annular flange portion 8 that projects from the rear wall 7 of the housing 1 . The air motor 112 has an air supply port 112a and an exhaust port 112b, and the air supply port 112a is connected to a valve 128.
The exhaust port 112b is connected to a pressure source (not shown) through a line 129 equipped with The introduction hole 2 of the chamber 24 is
Connect to 5.

In this embodiment, the exhaust of the pressurized air for driving the air motor is branched and purified, and introduced into the chamber 24 and connected to the hole 9 and the shaft 11.
6 spaces were sealed.

FIG. 4 shows a third embodiment.

In this embodiment, the housing 1 is connected to the raw material input port 202.
It is composed of an upper cylindrical part 204 forming the discharge port 203, a lower cylindrical part 205 forming the discharge port 203, a front cover 222 and a rear cover 207 connected to the front and rear of the upper cylindrical part 204, and an annular flange part 208 protruding from the back of the rear cover 207. death,
Bolts 2 are attached to the periphery of the flange portion 214 of the reducer 213 of the drive unit 211 to the end surface of the flange portion 208.
Combine at 15.

The rotor 217 housed in the space in the housing 1 has a plurality of radially open pockets 220 radially outward in its axially intermediate portion, and a boss portion 218 is formed at the base of each pocket 220 . , pocket 220... is on the front and rear walls 217
a, 217b and a circumferential wall 219. The shaft 216 of the motor 212 is fitted into the mounting hole 221 of the boss portion 218 through the hole 209 of the rear cover 207 .

Pressure air is supplied into the chamber 224 through an introduction hole 225 through a pressure line 226 equipped with a valve 227, and the air is supplied into the chamber 224 through a gap S.
On the other hand, an introduction hole 233 is provided in the center of the front cover 222, and pressurized air is supplied between the front wall 217a and the cover 222 through a line 235 provided with a valve 234. , seal this space.

FIG. 5 shows a fourth embodiment.

In this embodiment, the rotor drive shaft is supported on both sides, and the housing 1 has an upper cylindrical portion 304 forming a raw material input port 302 and a lower cylindrical portion 3 forming a discharge port 303.
05, front cover 322 connected to the front and rear of this,
It is composed of a rear cover 307 and forms a rotor storage space surrounded by these. Covers 307, 32
Shaft insertion holes 309 and 336 are provided in the center of 2,
A middle chamber boss portion 30 is placed outwardly in each axial direction so as to surround this.
8,337. A rotor 317 is housed in the space 306, and a shaft insertion hole 321 of a shaft-shaped boss portion 318 at the base of the blade 319 is of a penetrating type, and the drive shaft 316 is coupled thereto. The shaft 316 passes through the holes 309, 336, inside the boss portions 308, 337, and through holes 3 provided in the end walls 308a, 337a.
Both supporting parts extend through 08b and 337b, and one end is connected to a drive unit (not shown). Both ends of the shaft 316 facing inside the boss portions 308, 337 are supported by bearings 338, 338, and seal members 339, 339 are interposed in front of these, and the seal members 33
Chambers 324 and 340 are formed in front of 9 and 339. These chambers 324 and 340 are connected to an introduction hole 325 into a pressure air line 326 with a valve 327 interposed therebetween, an introduction hole 325 into a pressure air line 326 with a valve 341 interposed therebetween, and an introduction hole 34 into a pressure air line 342 with a valve 341 interposed therebetween.
3.

In the above, the cover 32 of the dual support shaft 316 is
Pressure air is supplied to the gaps S and S between the rotor 317 and the rotor 317, sealing both ends of the shaft, preventing the material being transferred by the rotor 317 from being discharged to the outside, and sealing the rotating part from both sides.

(Effects of the invention) As is clear from the above, according to the invention, firstly, pressurized air is supplied between the drive shaft insertion hole, which is a stationary part, and the drive shaft, which is a rotating part. This seals out the flow of the transported material to the outside, providing a highly effective seal, and since there is no sealing member, there is no generation of abrasive material, which prevents this from getting mixed into the transported material, making it hygienic. It can also be used as a rotary valve for manufacturing equipment for drugs, etc.

Secondly, since a sealing member is not required, there is no need for a support groove or a pressing mechanism, etc., and the structure is simple because pressurized air is simply supplied between the drive shaft insertion hole, which is a stationary part, and the drive shaft, which is a rotating part. Simplify.

Effects of the Example First, as in the example, the chamber forms an air chamber to supply pressurized air between the drive shaft insertion hole, which is a stationary part, and the drive shaft, which is a rotating part, through the chamber, and the drive shaft insertion hole, which is a stationary part, is supplied through the chamber. Uniform pressure is supplied between the hole and the rotating drive shaft, allowing for a stable and reliable seal.

Next, when an air motor is used as the driving means, the air pressure of the air motor can be used, the air pressure source can be shared, and the sealing device can be easily obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of the first embodiment of the present invention, Fig. 2 is a sectional view taken along the line 2-2 in Fig. 1, Fig. 3 is a longitudinal sectional side view of the second embodiment, and Fig. 4 is a longitudinal sectional view of the third embodiment. FIG. 5 is a longitudinal sectional view of the fourth embodiment. In addition, 1 in the drawing is a housing, 17, 117, 21
7,317 is the rotor, 16, 116,216,
316 is a drive shaft, 9, 109, 209, 309 is a shaft insertion hole, 24, 124, 224, 324, 34
0 is chamber, 26,126,226,326,342
1 is a pressure line, and 112 is an air motor.

Claims (1)

[Claims for Utility Model Registration] 1. A housing having a raw material input port and a raw material discharge port spaced apart from each other and rotatably housing a rotor driven by a drive shaft between the housings, which is provided on the rear wall of the housing. A non-contact seal type rotary valve, characterized in that pressurized air is supplied to a gap formed between a drive shaft insertion hole and the drive shaft, and is guided to a space in which the rotor is housed. 2 The rotor is driven by a cantilevered drive shaft, and pressurized air is supplied to the gap between the drive shaft and the drive shaft insertion hole on one side of the housing, and between the other side of the housing and the rotor rotating part. The non-contact seal type rotary valve according to Claim 1 of the above-mentioned utility model registration, which is adapted to supply pressurized air. 3. The rotor is driven by drive shafts supported on both sides, and pressurized air is supplied between the rotor and the shaft insertion holes on both sides of the housing.
Non-contact seal type rotary valve. 4. The non-contact seal type rotary valve according to any one of claims 1, 2, and 3 of the utility model registration, wherein the pressurized air is supplied through a pressure air chamber attached to the housing. 5. The driving means for the drive shaft is an air motor, and the driving air of the air motor is used to supply pressurized air to the rotating part. Non-contact seal type rotary valve according to any of item 3.