JP5443770B2 - Rotary valve - Google Patents

Description

  The present invention relates to a rotary valve, and more particularly to improvement of a rotary valve having a function of an air block while transferring powder and granules by air or gas and supplying the powder and granules quantitatively.

  Conventionally, the outline of the rotary valve described above is configured as shown in a part of FIG. 1 and a sectional view of FIG. The rotary valve has a casing 1. The casing 1 has an inlet 2 at the top and an outlet 3 at the bottom. The inlet 2 and outlet 3 are vertically penetrated.

  Further, side plates 4a, 4b are fastened to the casing 1 by bolts 5, 5,... In window holes formed on both side surfaces of the casing 1. The side plates 4a and 4b are provided with support portions for the rotary shaft 6. Oil seals 7, 7,... And bearings 8, 8 are arranged on the support portions. 7 through the side plates 4 a and 4 b in contact with the bearings 8 and 8.

  A rotor 9 is fitted to the rotary shaft 6 by means such as a key, and the rotor 9 rotates synchronously with the rotary shaft 6. The powder and granules charged from the inlet 2 are quantified. A plurality of pockets 10, 10,.

  Further, one end of the rotary shaft 6 is connected to a drive motor 11 with a speed reducer via a coupling 17. If the rotational speed of the drive motor is constant, the discharge amount of the powder and granules is also constant, thereby fulfilling the function of quantitative supply. In order to transfer the powder and particles, air and gas velocities are required to some extent, and the presence of the pressure is indispensable. Therefore, a pressure difference is generated between the upper part and the lower part of the rotary valve. For this reason, air and gas pass from top to bottom or from bottom to top. When the amount of passing air or gas is large, the transfer energy is wasted. Therefore, it is desirable that the clearance between the rotor 9 and the inner surface of the casing 1 be as small as possible. Conventionally, this clearance is about 0.2 mm.

  In addition, a space 12 is usually formed between the rotor 9 and the side plates 4a and 4b in order to avoid friction. However, if the powder or particles accumulate in the space 12 and solidify, intense friction occurs. The operation may stop. Therefore, it is necessary to make this space 12 wide to some extent.

  Further, in order to prevent the powder and granules from staying, an opening portion 13 called powder drop is provided below the space 12. As a result, the air below the rotary valve enters the space 12 without resistance, and its internal pressure is equal to that below the rotary valve. Therefore, the narrow clearance that obstructs the differential pressure between the top and bottom of the rotary valve is effective only around the upper opening (on the inlet 2 side), and meaningless around the lower opening (on the outlet 3).

That is, the clearance between the rotor 9 and the casing 1 is more effective when the upper side (the inlet 2 side) is narrower than when the clearance around the entire rotor 9 is narrowed. Therefore, the clearance between the casing 1 and the rotor 9 can be increased to about 0.3 to 0.5 mm. Conventionally, the tolerance of this clearance has been very severe as 0.2 ± 0.05 mm, but about 0.3 to 0.5 mm ± 0.1 mm is sufficient. Conventionally, a clearance of 0.1 mm is required for high pressure use, and a sturdy casing and high-precision machining are required.
Although the applicant investigated the prior art documents related to the present invention, the applicant could not find any documents that were particularly relevant and considered similar.

  The problem to be solved by the present invention is that a contact accident between the rotor and the casing may occur due to a small clearance. When this contact accident occurs, the scraped metal powder should be treated with powders and granules. In such a case, once such an accident occurs, it is necessary to recover the powder and granules from the shipped product, and this cost is enormous.

  Moreover, in order to achieve the clearance required conventionally, the casing must be made strong and machine processing is required, so that the weight of the casing increases and the cost for processing increases. In order to transfer the body and the granule, there is a large amount of leakage due to the blow-through of air and gas, and the energy required for the transfer was wasted.

In order to achieve this object, a rotary valve according to the present invention comprises a casing having a transfer path penetrating in the vertical direction, a side plate fixed to a window hole formed in a side surface of the casing, and the side plate. through to a rotary shaft disposed within the casing, attached to the rotation shaft, a rotary valve comprising a rotor having a plurality of pockets, the above-mentioned rotor and the rotating shaft and the casing and the insulating state In the rotary valve having a configuration in which a conductive contact is slidably contacted with a part of a metal joint that connects the rotary shaft or the rotary shaft to a drive motor, and electric power is applied to the rotor via the shaft, the metal joint described above Between the coupling and rotating shaft to connect with the drive motor Zaisa is, has an intermediate element made of an insulating material, wherein the conductive contact is characterized by being in sliding contact with the rotating shaft side, separated and the intermediate element of the metal fitting.

In the rotary valve according to the present invention, a bearing is provided in the rotating shaft insertion portion of the side plate described above, and a sleeve formed of an insulating material is disposed between the bearing and the rotating shaft, and both end surfaces of the bearing are arranged. Is characterized by having a ring formed of an insulating material .

  The rotary valve according to the present invention is configured as described above. Therefore, when the rotor and the casing come into contact with each other, energization occurs, which can be notified by an alarm sound or the like, the operation can be stopped immediately, and mixing of metal powder can be prevented in advance. In addition, since the position of the rotor is variable, it is no longer necessary to perform precision machining to the left, the weight of the casing can be reduced, and the cost can be greatly reduced. And by making the position of the rotor variable and narrowing only the upper clearance, the amount of leakage due to blow-through of air and gas is reduced, and transfer energy is not wasted, which is a very effective configuration.

  This was realized by configuring as described in the drawings and examples.

  Next, a preferred embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view showing a rotary valve embodying the present invention, FIG. 2 is a front view of the same, FIG. 3 is a view showing attachment of an adjustment bolt, FIG. 4 is a view showing another attachment of the adjustment bolt, and FIG. The figure which similarly shows a modification, FIG. 6 is a figure which similarly shows the rotor from which the position was changed. In addition, the same code | symbol is attached | subjected to the part which is common in a prior art example, and detailed description is abbreviate | omitted.

  In this embodiment, sleeves 14 and 14 formed of an insulating material are disposed between the rotary shaft 6 and the bearings 8 and 8... Rings 15 and 16 formed of an insulating material are formed at both ends of the bearings 8 and 8. Is arranged. A metal joint 17 is interposed between one end of the rotary shaft 6 and the motor 11 with a speed reducer, and an intermediate element 18 formed of an insulating material is provided on the metal joint 17. In this way, the rotor 9 and the rotary shaft 6 are insulated from other members.

  Further, a through hole 20a is formed in a part of the case 20 that supports the motor 11 with a speed reducer on the side plate 4a and covers the metal joint 17, and a metal conductive contactor is formed through the through hole 20a. 21 is inserted into the inside, and the conductive contact 21 is in contact with a part of the rotary shaft 6 side separated by the intermediate element of the metal joint 17. That is, the conductive contact 21 is always in sliding contact with the rotation of the rotary shaft 6, or the metal joint 17, and a minute voltage is applied to the rotor 9 via the rotary shaft 6. Reference numeral 21a denotes a wire (cable).

  With this configuration, if the rotor 9 comes into contact with the casing 1, a current flows and can be detected. If an alarm sound is generated by the detected current signal, the operation of the apparatus is immediately performed. The situation of mixing metal powder can be avoided by stopping. In the embodiment, an insulating material is provided as the sleeve 14 between the rotary shaft 6 and the bearing 8, but this insulating material may be provided between the bearing 8 and the side plates 4 a and 4 b.

  Further, in the rotary valve according to the present invention, the position of the rotor 9, and the position of the rotary shaft 6 to which the rotor 9 is attached and the side plates 4a and 4b that support the rotary shaft 6 are slightly changed in the vertical and horizontal directions. Is possible. That is, the adjustment bolts 22, 22... Are screwed into the side plates 4a and 4b and the lower and side portions of the casing 1 at a plurality of locations, in this embodiment, at three locations, to form projecting portions 23, 23. .

  In the rotary valve having such a configuration, the clearance between the casing 1 and the rotor 9 and the clearance is about 0.3 to 0.5 mm. Here, after loosening the bolts 5, 5... That fasten the side plates 4 a and 4 b to the casing 1, the adjustment bolts 22, 22. Push upwards to adjust the clearance, and after that adjustment, the fastening bolts 5, 5. Thus, by slightly pushing up the side plates 4a and 4b, the clearance between the rotor 9 and the casing 1 is narrow on the upper side and wide on the lower side.

  Furthermore, when this configuration is used for the energization effect by the conductive contact 21 described above, even if adjustment of the clearance becomes necessary after the operation of the apparatus is started, the product can be easily incorporated from the outside without being removed from the line. And it becomes possible to perform this adjustment operation | work safely.

  That is, without removing the product from the line, only the rotation is temporarily stopped, and the side plates 4a and 4b are pushed up until the electrical contact alarm is issued, that is, until the rotor 9 contacts the casing 1. Then, from this contact start point, the adjustment bolt 22 is rotated at the number of rotations corresponding to the distance for obtaining the required clearance calculated in advance, and the side plates 4a and 4b are lowered by gravity (self-weight). Here, it is meaningless to arrange bolts and other elements for pushing down the side plates 4a and 4b. After this adjustment, the fastening bolts 5, 5,.

  Also, as shown in FIG. 2, the projections 23, 23 are provided on the casing 1 and the adjustment bolts (push bolts) 22, 22 are provided. This is because the side plates 4a, 4b are disposed as shown in FIG. An adjustment bolt (push bolt) 22 is provided in the through hole, and the casing 1 is slightly shifted in the center axis to form a through hole 24 having a diameter larger than the outer diameter of the adjustment bolt (push bolt) 22 for adjustment. When the bolts (push bolts) 22 are pushed in, the side plates 4 a and 4 b may move relative to the casing 1. The through hole 24 can be a bottomed hole 24a as shown in FIG. Of course, the lock nut 25 may be arranged. In short, not only the adjustment bolt 22 but any element that can move the side plates 4a and 4b relative to the casing 1 may be used.

  The rotary valve according to the present invention is configured as described above. In this embodiment, a general rotary valve that supports the rotating shaft 6 at both ends is taken as an example. However, the rotating shaft with the rotor attached is supported only on one side, and the opposite side is provided with an open / close door to take out the rotor to the outside. It can also be applied to so-called sanitary rotary valves that perform cleaning. In that case, the position of only the side plate that supports the rotating shaft may be finely adjusted in the vertical and horizontal directions.

It is sectional drawing which shows the rotary valve which implemented this invention. It is a front view. It is a figure which shows the attachment of an adjustment bolt. It is a figure which shows the other attachment of an adjustment bolt. It is a figure which shows a modification. It is a figure which shows the rotor by which the position was changed. It is sectional drawing which shows the rotary valve as a prior art example.

DESCRIPTION OF SYMBOLS 1 Casing 2 Input port 3 Discharge port 4a Side plate 4b Side plate 5 Bolt 6 Rotating shaft 7 Oil seal 8 Bearing 9 Rotor 10 Pocket part 11 Motor with a reduction gear 12 Space 13 Opening part 14 Sleeve 15 Ring 16 Ring 17 Metal joint 18 Intermediate element 20 Case 20a Through hole 21 Conductive contact 21a Wire 22 Adjustment bolt 23 Protrusion 24 Through hole 24a Bottomed hole 25 Lock nut

Claims (2)

A casing having a transfer path penetrating in the vertical direction, a side plate fixed to a window hole formed in a side surface of the casing, a rotating shaft disposed in the casing through the side plate, and A rotary valve that is attached to a rotary shaft and includes a rotor having a plurality of pockets, wherein the rotor and the rotary shaft are insulated from the casing, and the rotary shaft or the rotary shaft is connected to a drive motor. In a rotary valve in which a conductive contact is slidably contacted with a part of the joint and electric power is applied to the rotor via the shaft, the metal joint described above is provided between the coupling for coupling with the drive motor and the rotary shaft. Has an intermediate element that is interposed between and formed of insulating material. Rotary valve and conductive contacts which is characterized in that in sliding contact with the rotating shaft side, separated and the intermediate element of the metal fitting. A bearing is provided at the rotating shaft insertion portion of the side plate described above, a sleeve formed of an insulating material is disposed between the bearing and the rotating shaft, and rings formed of an insulating material are provided at both end surfaces of the bearing. It has, The rotary valve of Claim 1 characterized by the above-mentioned .

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