JPH072343U - Rotary valve - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the sealing performance on the side casing side of a rotary valve and effectively prevent galling of powder particles at the seal portion. A rotary having a rotor rotatably housed in a casing and having blades radially arranged on a rotating shaft, and discharging powder particles or the like introduced from an inlet opened in the casing by the rotation of the rotor to an outlet. In the valve, an end plate is integrally provided on the blade side edge of the rotor to face the inner surface of the rotor housing cylinder of the casing main body for sealing. A groove that is inclined with respect to the rotor rotation direction is formed on the outer circumferential portion of the end plate, and the outer end opening of this inclined groove is located rearward of the inner end opening in the rotor rotation direction. Further, in addition to the end plate, a cylindrical ring facing the casing body may be provided, and an inclined groove may be formed in the cylindrical ring and sealing may be performed here.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary valve, and more particularly, to an improvement of a rotary valve suitable for use in supplying powdery particles or the like to a pressurized atmosphere such as an air transportation pipe.

[0002]

[Prior art]

 Generally, when pneumatically transporting powdery or granular material, pressurized air is supplied to the pipeline, and the powdery or granular material is placed on it and transported. A rotary valve is used to supply compressed air as a material to be conveyed to such a transportation route so that pressurized air does not leak to the supply hopper side of the powder.

In this type of rotary valve, a plurality of blades are radially planted on a rotary shaft and housed in a cylinder portion formed in a casing body, and side portions of the rotor are covered by side casings. ing. In such a rotary valve, the gap between the rotor and the casing determines the sealing performance. There are a gap between the tip of the rotor blade and the casing body, and a gap between the side surface of the blade and the side casing.For the gap between the tip of the rotor blade and the casing body, attach an elastic material such as rubber to the tip of the blade. By making contact with the inner peripheral surface of the cylinder portion of the thing, the sealing performance has been improved.

[0004]

[Problems to be solved by the device]

 However, the clearance between the side surface of the rotor blade and the side casing is affected by the manufacturing accuracy as well as the manufacturing accuracy, and it is difficult to control the clearance, and there is a limit to improving the sealing performance. Further, when they are brought into contact with each other, fine powder may enter the gaps and may not be discharged, and galling may occur.

The present invention provides a rotary valve that eliminates the gap between the side surface of the blade and the side casing to improve the sealing property, and particularly can effectively discharge the powder or granular material that has entered the gap. The purpose is.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a rotary valve according to the present invention firstly rotatably accommodates a rotor having blades radially implanted on a rotating shaft in a casing and opens the casing by the rotation of the rotor. In a rotary valve that discharges powder and other particles introduced from the inlet to the outlet, an end plate is integrally provided on the blade side edge of the rotor so as to face the inner surface of the rotor housing cylinder of the casing body and seal the end. A groove that is inclined with respect to the rotor rotation direction is formed on the outer circumferential portion of the plate, and the outer end opening of this inclined groove is located rearward of the inner end opening in the rotor rotation direction.

Secondly, a rotor having blades radially arranged on a rotating shaft is rotatably housed in a casing, and powder particles or the like introduced from an inlet opened in a casing by the rotation of the rotor. In the rotary valve that discharges to the outlet, an end plate is attached to the blade side edge of the rotor and a cylindrical ring of the same diameter is integrally provided on the outer peripheral edge of the end plate to face the inner surface of the rotor housing cylinder of the casing body. The cylindrical ring outer peripheral surface and the sheathing are brought into rotary contact with each other via a seal, and a groove inclined with respect to the rotor rotating direction is formed on the outer peripheral surface of the cylindrical ring. The outer end opening is located rearward of the inner end opening in the rotor rotation direction.

[0008]

[Action]

 An end plate is integrally provided on the side surface of the rotor blade, and the outer peripheral surface of the end plate is brought into rotational contact with the inner peripheral surface of the casing body, so that it is not necessary to provide a seal with the side casing. . As a result, by integrating the end plate on the rotor side, the inner surface dimensions of the casing body and the rotor dimensions can be determined by cutting accuracy, and the outer peripheral surface of the end plate can be fitted with a gland packing or seal ring. The sealability can be improved. In addition, by cutting a fine inclined groove on the outer peripheral surface of the end plate in particular, when the rotor rotates, the powder that has entered the seal gap due to the screw effect is eliminated, and galling at the seal portion can be prevented.

According to the second aspect of the invention, a cylindrical ring having the same diameter as the rotor blade is provided on the outer edge of the end plate, and an inclined groove is formed in the cylindrical ring, which also has a function of preventing galling of the powder and granules, and has a wide width. The cylindrical ring makes it possible to achieve a seal with the casing, facilitates attachment of the seal material, makes it possible to apply a commercially available shaft seal material, and improves the sealability.

[0010]

【Example】

 Hereinafter, a specific embodiment of the rotary valve according to the present invention will be described in detail with reference to the drawings.

FIG. 1A is a sectional view showing a first embodiment of a rotary valve of the present invention, and FIG. 1B is a perspective view of a rotor. As shown in the figure, the rotary valve 10 rotatably accommodates the rotor 14 inside the casing body 12, and is covered by a side casing 16 so as to seal a side portion of the rotor 14. An inlet 18 for introducing a powder or granular material to be supplied is formed in the upper part of the casing body 12 to be connected to a hopper (not shown), and an outlet 20 is also formed in the lower part to be connected to an air transport pipe (not shown). ing. A cylindrical portion 22 for accommodating the rotor 14 is penetratingly formed in the casing body 12 so as to traverse the passages of the inlet 18 and the outlet 20, and the rotor 14 blocks the passages of the inlet 18 and the outlet 20.

In the rotor 14 housed in the cylinder portion 22 of the casing body 12, as shown in FIG. 1B, a plurality of blades 26 are radially arranged on the outer peripheral surface of the rotary shaft 24. . The blade 26 has a flat plate structure and has a length corresponding to the width dimension of the inlet 18 and the outlet 20. In particular, in this embodiment, the side portion of the rotor 14 is sealed not with the side casing 16 but with the casing body 12. For this reason, the rotor 14 is provided with end plates 28 so as to be integrally coupled to the rotary shaft 24 and the end surfaces of the blades 26 so as to cover the end surfaces on both sides of the blades 26. As a result, the rotor 14 itself is provided with a fan-shaped cross-section for accommodating the granular material, which is partitioned by the blades 26 and the end plates 28. Further, in this embodiment, a cylindrical ring 30 extending integrally from the outer edge of the end plate 28 to the outer side of the rotor blade 26 is provided. The cylindrical ring 30 faces the cylinder portion 22 of the casing body 12 so as to be in rotational contact therewith, and a seal ring 32 is interposed between the outer peripheral surface of the ring and the cylinder portion 22 so as to form a rotary seal. As a result, the rotor 14 exerts the sealing function only with the casing body 12, and it is not necessary to perform the sealing action with the side casing 16. The side casing 16 located on the side of the rotor 14 and covering the opening of the cylinder portion 22 is attached to the casing body 12 so as to be separated from the cylindrical ring 30 on the side of the rotor 14 and to have a rotation supporting function and a dustproof function of the rotor 14. Good.

In addition to such a configuration, in this embodiment, as shown in FIG. 1B, a large number of grooves 34 are formed on the outer peripheral surface of the cylindrical ring 30 facing the cylinder portion 22. Is formed. The groove 34 is cut so as to be inclined with respect to the rotation direction (arrow A) of the rotor 14, and in the inclination direction, the inner end opening (opening on the blade 26 side) of the cylindrical ring 30 is the outer end opening (side casing 16 side). ) It is set to be located in front of the rotation. As a result, when a powder or granular material enters between the cylinder portion 22 and the cylindrical ring 30, the powder is guided to the inclined groove 34 by the rotational centrifugal force and can be easily discharged into the space 36 between the side casing 16. .

Further, the side casing 16 is provided with a pressure equalizing port 38 so that a high pressure gas equivalent to the outlet pressure can be introduced, and the internal pressure of the space 36 between the rotor 14 and the side casing 16 is discharged to the outlet. It is adjustable to be equal to the pressure. The pressure equalizing port 38 may be connected to an air transportation pipe or a separate pressure source, and it is particularly effective when high pressure gas acts in the rotary valve and the seal ring 32 alone cannot seal.

When the rotary valve 10 configured as described above is operated, it enters the space defined by the rotor blades 26 from the powder inlet 18 and is discharged from the powder outlet 20 as the rotating shaft 24 rotates. . In the rotor 14, if the end plate 28 and the cylindrical ring 30 are integrally formed on both sides of the blade 26 and the commercially available seal ring 32 is attached so as to be in contact with the cylindrical ring 30, the rotor 14 and the side casing 16 are attached. The gas flowing through the gap can be blocked. Further, when high-pressure gas acts and the seal cannot be achieved by the seal ring 32 alone, the sealing performance can be improved by introducing a high-pressure gas corresponding to the pressure on the powder outlet 20 side from the pressure equalizing port 38. Further, if the rotor blades 26 and the casing body 12 are made to have a very small gap or contact as shown in FIG. 1A, the leakage of high pressure gas on the powder outlet 20 side can be significantly reduced.

Further, the cylindrical ring 30 is provided with a groove 34 having a depth of about 0.1 mm and opposite inclination angles at both ends, so that the powder or granules that try to enter the side casing 16 side of the rotor 14 are provided. It can be eliminated by rotation. By doing so, the sealing property can be maintained for a long time.

Next, FIG. 2 shows a second embodiment of the present invention. This is an example in which an elastic ring packing 40 is used instead of the commercially available seal ring 32. The ring packing 40 is attached to the cylindrical ring 30 with a very small clearance, another ring packing 42 is also attached in the same manner, and the casing body 12 is hermetically sealed, and high-pressure gas is introduced from the pressurizing seat 44 to introduce the ring packing 40. , 42 are deformed under pressure and brought into contact with the cylindrical ring 30. As a result, the leakage of high-pressure gas on the powder outlet 20 side could be significantly reduced.

In the above embodiment, the rotor 14 is provided with the end plate 28 and the cylindrical ring 30. However, the end plate 28 has a thick or hollow disc structure, and the inclined groove 34 is formed on the outer surface thereof. It is also possible to form.

[0019]

[Effect of device]

 As described above, according to the present invention, the rotor having the blades radially arranged on the rotating shaft is rotatably housed in the casing, and the powder introduced from the inlet opened in the casing by the rotation of the rotor. In a rotary valve that discharges granules and the like to the outlet, an end plate is integrally provided on the blade side edge of the rotor to face the inner surface of the rotor housing cylinder of the casing body and seal the end plate. Has a groove that is inclined with respect to the rotor rotation direction, and the outer end opening of this inclined groove is located rearward of the inner end opening in the rotor rotation direction. Since a cylindrical ring facing the above is provided and an inclined groove is formed in this ring and sealing is performed here, the gap between the rotor and the side casing is replaced with the gap between the rotor and the casing. Owl, it improves the conventional which was difficult side casing of the sealing property, the excellent effect that the granular material entering the seal portion can prevent galling at the sealing portion is discharged obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary valve and a perspective view of a rotor according to a first embodiment.

FIG. 2 is a sectional view of a rotary valve according to a second embodiment.

[Explanation of symbols]

 10 rotary valve 12 casing body 14 rotor 16 side casing 18 inlet 20 outlet 22 cylinder part 24 rotating shaft 26 rotor blade 28 end plate 30 cylindrical ring 32 seal ring 34 inclined groove 36 side space 38 pressure equalizing port 40, 42 ring packing 44 addition Pressure seat

Claims (2)

[Scope of utility model registration request] 1. A rotor having blades radially arranged on a rotating shaft is rotatably housed in a casing, and powder or the like introduced from an inlet opened in the casing by the rotation of the rotor is discharged to an outlet. In this rotary valve, an end plate is integrally provided on the blade side edge of the rotor so as to face and seal the inner surface of the rotor housing cylinder of the casing body, and the outer peripheral surface of the end plate is inclined with respect to the rotor rotation direction. The rotary valve is characterized in that the outer end opening of the inclined groove is located rearward of the inner end opening in the rotor rotation direction. 2. A rotor having a blade radially installed on a rotary shaft is rotatably housed in a casing, and powder or the like introduced from an inlet opened to the casing by the rotation of the rotor is discharged to an outlet. In this rotary valve, an end plate is attached to the side edge of the blade of the rotor, and a cylindrical ring of the same diameter is integrally provided on the outer peripheral edge of the end plate so as to face the inner surface of the rotor housing cylinder of the casing body for sealing. , The cylindrical ring outer peripheral surface portion and the sheathing are brought into rotary contact with each other via a seal, and a groove inclined to the rotor rotation direction is formed on the outer peripheral surface portion of the cylindrical ring, and an outer end opening portion of the inclined groove is formed. A rotary valve characterized in that it is located rearward of the inner end opening in the rotor rotation direction.