JPH0316828Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rotary valve particularly suitable for supplying hygroscopic powder. Impellers are pivotally attached to the edges of radial blades of a spider shaft, and the impellers are connected to each other by spring plates. an elastic body with a trough formed therebetween, and the spider axis is eccentric from the center of the housing body to increase the amount of change in the contact speed between the inner wall of the housing body and the impeller and the change in the volume inside the draft. ,
At the discharge port of the moisture-absorbing powder, the impeller leaves contact with the inner wall, and the elastic force of the impeller makes it easy to discharge the contained powder.It also prevents adsorption of the moisture-absorbing powder and prevents self-reflection during discharge. This is a rotary valve that also has a cleaning function.

Conventionally, rotary valves have a cylindrical housing with an oval inner wall in cross-section, and an impeller that rotates in an airtight state. There are some types that have two-shaft impellers that cross each other to scrape off the adhering powder, and a scraper device that touches the trough surface between the impellers and removes the adhering powder at the discharge port. There are adhesion prevention and self-cleaning mechanisms, such as removing adhering powder by using falling vibrations using an impact member caused by objects or impellers falling one after another into the main body of the impeller. If the impeller arm is made of an elastic material such as steel or stainless steel, the amount of change in volume is small, making it difficult to discharge and remove moisture-absorbing powder, and if the elastic body is made of synthetic resin, high-temperature moisture-absorbing powder Not suitable for use. In either case, unless powder adhesion, residual accumulation, and solidification within the trough or between the inner wall of the housing body and the impeller are prevented, it is difficult to constantly supply a constant amount of powder, and cleaning and removal after stopping operation will result in residual powder remaining. This is an essential and difficult task in order to prevent the powder from sticking and solidifying.

The purpose of this invention is to solve these problems and obtain a rotary valve that has a sophisticated function of preventing powder adsorption.

An example of implementing this invention will be described below with reference to the drawings.

An impeller 5 provided with a joint block 10 that slides closely against the inner wall 1 of the housing a is pivotally connected to the end of the radial blade 4' of the spider shaft 4 by a pin 7 so as to be rotatable and movable. 5,
5 are attached to each other at their edges, and a joining block is provided with groove-width slits into which spring plates 6 are inserted at the lower sides of both sides of an end cap-shaped member 9 that rotates by sliding on the inner wall 1 of the housing a. 10 and are connected by spring plates 6, 6, . Housing a having a powder supply port 2 at the top and a discharge port 3 at the bottom
With respect to the center of the cylindrical body, the spider axis 4 is y ¹ , y ²
It is installed with an eccentricity of . Also, as shown in Fig. 2, seal plates 11 are provided on both sides of the spider shaft.
The spider shaft 4 is sealed and rotates simultaneously with the spider shaft 4 to reduce rotational wear with the spring plate 6. However, in the event that powder leaks outside the seal plate 11, the lower part b
It is configured so that it falls from the discharge port 3 after passing through the gap.

In this invention according to the above structure, due to the eccentricity of the spider shaft 4, the impeller 5 is connected by a spring plate 6 to form an elastic body, so as the impeller 5 rotates, the airtightness with the inner wall 1 is gradually increased. The impeller 5 exhibits a bent state, and the trough 8 reaches its minimum volume at the position of the supply port 3 in the upper part of the housing a, and then, as shown in FIG. It acts as an adsorbent and prevents adhesion because it causes the powder to spread. Furthermore, at the moment when the impeller 5 is released from the tensioned state of contact with the inner wall of the lower discharge port 3, the spring plate 6 and the emperor 5, that is, the trough 8 are released, so that the impeller 5 and the spring plate are moved by the elastic force of the elastic body. 6
It is possible to reliably shake off the powder that is stuck to the surface by the reaction, and it is easy to discharge the moisture-absorbing powder.
The state of the impeller 5 at that moment is as shown by the chain line in FIG. When the impeller 5 moves past the powder discharge port 3 into the housing a,
The impeller 5 gradually changes due to the eccentric position of the spider shaft 4.
The curvature increases and the internal volume of the trough decreases. The block 10 that is joined to the tip of the impeller 5 shown in FIG. 3 is in close contact with the inner wall 1 of the housing a, so if it wears out or breaks, it is sufficient to replace the cap-shaped member 9 on the end face of the joining block 10. It is.

This device has an elastic body structure with an eccentric spider shaft 4, pivoting of the impeller 5, and a spring plate 6 stretched between the impellers 5, so that the outside of each impeller 5 is attached to the inner wall 1. Although the moving time of the contacting end cap-shaped members 9 and 9 is the same, since the moving distance is different, the contact speed changes, which causes a change in the volume inside the trough 8, which in turn causes the powder to be pushed. It functions to prevent hardening and adhesion by itself, and the magnitude of the change in the elastic body of the impeller 5 ensures that the adhering or adsorbed powder is shaken off, thereby ensuring stable operation of fixed quantity supply. In particular, the strong elasticity at the discharge port 3 of the impeller 5 functions to discharge the powder in the trough 8 and perform cell cleaning.
The ease of replacing the impeller 5 when it wears out is as described above, and it is also possible to process highly heat-hygroscopic powder. In addition, the structure is simple, and it does not require an additional device for removing adhering powder, and can be provided at a much lower cost than the cross-scraping method using two shafts.

[Brief explanation of the drawing]

The drawing shows an example of the implementation of this idea.
Figure 1 is a longitudinal sectional view, Figure 2 is a partially cutaway front view,
FIG. 3 is a detailed sectional view of a portion of the impeller tip. 1... Housing inner wall, 4... Spider shaft,
4'...Radial vane of spider shaft, 5...Impeller, 6...Spring plate, 7...Pin, 8...Trough, 9...End cap-shaped member, 10...Joining block, 11...Seal plate.

Claims (1)

[Scope of utility model registration request] An impeller 5 is pivotally attached to the edge of the radial blade 4' of the spider shaft 4, and an end cap-shaped member 9 is attached to the other end of the impeller and slides on the inner wall 1 of the housing a.
, and slits with a groove width that matches the thickness of the spring plate 6 are provided on both lower sides of the member to form a joint block 10 , and the opposing impellers 5 and 5 are connected to each other through the slits of the joint blocks 10 and 10 to form a joint block 10 . 6 to form an elastic body with a trough 8 formed therebetween, and the spider shaft 4 is provided eccentrically from the center of the housing body a, so that the moving distance of each impeller is different. A rotary valve characterized in that the movable speed is changed to prevent or eliminate adhesion of moisture-absorbing powder to an elastic body.