JPH039176A - Valve for granule - Google Patents

Abstract

PURPOSE:To obtain a uniform and stable valve-closing function by setting up a flexible cylindrical valve unit in an outer cylinder and providing sealed space, formed by internal surfaces of the outer cylinder and external surfaces of the valve unit, so as to be folded in a pleat state, when a pressure is applied by pressure fluid, and so as to be spread in a cylinder shape when the pressure is reduced. CONSTITUTION:In an outer cylinder 2, a connection part 4, connected to a pressure applying-reducing means in the outside, is provided, while an inner cylinder 3 is integrally provided. ln this inner cylinder 3, many small holes 3' are drilled, and moderating action is held so that action of the pressure or its reduction, operated from the connection part 4, is uniformly generated in each part in the outer cylinder 2. A valve unit 5, internally mounted to the outer cylinder 2, is cylindrically formed by a soft material further with air-tightness, for instance, nylon cloth or the like. Mutually paired pleat- state fold-forming parts 11, 11, 12, 12, 13 and 13 and fold-inducing parts 21, 21, 22, 22, 23 and 23, in which a thickness is partly increased with an angular position in each 120 deg. serving as the reference, are formed in this valve unit 5. The valve unit 5 is pressurized by introducing compressed air from the connection part 4 to be uniformly jetted from the small holes 3' when a valve is closed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a powder valve installed in a pipeline system for powder transfer, and more specifically, the effective cross-sectional area inside the valve when the valve is open is equal to or greater than the inner diameter of the connecting pipeline. This relates to a valve for powder that can be made almost equal to .

[Prior art]

BACKGROUND ART In various food-related or ceramic-related plants, powder is transferred through pipeline systems, and the distribution is controlled by valves placed at appropriate locations.

Various types of these valves are adopted depending on the pressure difference upstream and downstream of the valve or the properties of the powder. For example, mechanical valves such as rotary valves with star-shaped compartments, rotary iris shutter valves, double damper valves, and pinch valves in which a flexible cylindrical body is pinched by a rigid body or fluid pressure are widely used. . The rotary valve can be used effectively when the valve is closed and also used for metering, but when the valve is opened, it tends to pinch the pipeline. Other mechanical valves also tend to trap powder when closed, and tend to create resistance to powder flow when opened.

Therefore, pinch valves that close a flexible cylinder by compressing it with fluid pressure are widely used when handling powder.

[Problem to be solved by the invention]

Pinch valves that use gas pressure and are installed in pipelines for powder transfer usually open the valve by using the restoring repulsive force of the valve body when the valve is opened. The sex cylinder is somewhat hard and has little flexibility.

As a result, the valve cannot be used if there is a negative pressure in a conduit or a sealed container such as a hopper that communicates with the valve, and the suction force exceeds the restoring repulsion force of the valve body. On the other hand, when closing the valve, a strong pressing force greater than the restoring repulsive force of the valve body is required. Furthermore, since the material of the valve body is somewhat hard, when a lump is caught in the valve body, a gap is created, which inevitably tends to deteriorate the sealing performance.

[Means for Solving the Problems] The present invention solves the above-mentioned problems and exhibits excellent sealing performance, and also allows the valve passage to have the same size as the inner diameter of the pipe line communicating with it when the valve is opened. We propose a powder valve that opens and does not create resistance to the flow of powder. Therefore, in the present invention, a flexible cylindrical body having excellent flexibility is used as the valve body. When the valve is closed, pressure is applied to the outside of this cylindrical body to fold it into pleats in the axial direction, forming a sealed state over a long span to enhance the sealing function, and when the valve is opened, the outside of this cylindrical body is folded into pleats. By reducing the pressure, the valve body is actively expanded to ensure a sufficient valve passage.

Therefore, the present invention provides a valve for powder that opens and closes a valve body by the action of fluid pressure, in which a flexible, airtight cylindrical body having a common axis is placed inside an outer cylinder made of a highly rigid material. A valve body is installed, and both ends of the outer cylinder and both ends of the valve body are sealed so that a sealed space is formed between the inner surface of the outer cylinder and the outer surface of the valve body, and the sealed space is pressurized. When pressurized with fluid, the pressure toward the axis causes the valve body to fold into folds in three or more directions on the plane perpendicular to the axis, and as the pressure is reduced, the valve body expands into a cylindrical shape on the plane perpendicular to the axis. It becomes.

If the structure of the outer cylinder is made into a two-layer structure consisting of an inner peripheral cylinder such as a punching plate with many holes, and an outer peripheral plate having a connection part to a fluid pressure pipe, the inside of the outer cylinder can be heated. When pressure is applied or depressurized, the effect of pressure on the flexible valve body can be made uniform in each part, and the function of the valve body becomes more reliable.

[For production]

When pinching a flexible valve body, conventional pinch valves have a structure in which pressure is applied from two opposing directions.
If the valve body can secure a valve passage equal to the inner circumference of the outer cylinder when the valve is opened, when folded twice, its width will be approximately 1.6 times the inner diameter of the outer cylinder, creating a triple or quadruple part. The valve closing function becomes unstable.

In the present invention, as shown in Fig. 1, the flexible valve body inside the outer cylinder is folded double in each part so as to form pleats in three or more directions in a plane perpendicular to the axis of the outer cylinder, and the valve body is sealed. Taking action. In this way, even if the valve body can secure a valve passage equal to the inner circumference of the outer cylinder, if it is shaped like a Y-shape in a plane perpendicular to the axis, the line at the tip of each ridge will touch the inner circumference of the outer cylinder, and it will be uniform. A stable valve closing function can be obtained.

In addition, when the cross-sectional shape of the valve body folded into double pleats is cross-shaped or star-shaped with five or more edges, the tip of the double folded ridge line may not reach the inner circumference of the outer cylinder. , the folded valve body is freely displaced within the outer cylinder, but the closing function is not impaired. Generally, it is advantageous for the cross-sectional shape of the valve body in the direction of the pleats in which the valve body is folded into double folds to be Y-shaped in three directions.

In the present invention, there are a plurality of pressurizing force lines facing each other on the flexible valve body sealed inside the outer cylinder, so that the flexible valve body is reliably folded due to the pressurizing action inside the outer cylinder. It is formed and folded into folds. The lines at the tips of the edges of these multiple folds contact the inner surface of the outer cylinder to form folds while maintaining balance, and at the same time, the surfaces of the valve body are in surface contact with each other over a wide area, so that the powder of the present invention It exhibits a closing function over a long span that spans almost the entire length of the body valve, and provides various excellent effects as a valve exclusively for powder.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of implementing the present invention will be described below with reference to the drawings.

As shown in FIG. 2 (lower half), the valve body 5, which is a cylinder that almost matches the inner peripheral surface of the outer cylinder 2, is inserted into the outer cylinder 2, and the outer cylinder 2 and the valve body 5 are inserted into the outer cylinder 2. The valve 1 for powder of the present invention is basically constructed by sealing one end of the outer cylinder 2 and the other end of the valve body 5 at a contact portion 6. The powder valve 1 in this embodiment has a connecting portion 4 connected to an external pressurizing/reducing means in the outer cylinder 2, and an inner peripheral cylinder 3 is integrally provided inside the outer cylinder 2. This inner cylinder 3 has many small holes 3.
This is done to maintain a relaxing effect so that the pressurization or depressurization from the connecting portion 4 is equalized at each part within the outer cylinder 2.

The valve body 5 housed in the outer cylinder 2 is preferably made of a flexible material with high airtightness, such as a cylinder made of nylon cloth biased and coated with silicone rubber. As shown in the exploded view of FIG. 3, this valve body 5 has pleat-shaped folded portions that are partially thickened based on angular positions of every 120 degrees and that form pairs with each other. 11 and 11.12 and 12.13 and 13, and fold reading parts 21 and 21.22 and 22.23 and 2
3 respectively. Therefore, each of these fold-forming parts and each fold-reading part has slightly less flexibility than other surface areas.

The powder valve 1 of the present invention configured as described above can be attached to a pipeline system or a hopper outlet for transferring powder by means of flanges at both ends that also serve as the contact portion 6 between the outer cylinder 2 and the valve body 5, for example. put to use.

When in use, the connecting portion 4 is connected to a fluid pressure supply/discharge means (not shown, but when the target is powder, it is usually by air pressure.

) are concatenated.

When the valve is closed, compressed air is introduced from the connecting part 4, and the compressed air is uniformly ejected from the small holes 3'' of the inner cylinder 3 to pressurize the valve body 5.The state shown in the lower half of Fig. 2 Due to the air pressure from the outer surface, the valve body 5, which was previously
, 21 , 22 , 22 , 23 , and 23 portions respectively rise toward the axis of the powder valve 1 , and follow the rise of these fold reading portions to form a pair of fold forming portions 1 .
1 and 11, 12 and 12, and 13 and 13 form folds with their respective intermediate portions as fold lines, and extend toward the axis. In this state, the flexible entire area of the valve body 5 is guided by the crease reading part and the fold forming part, and as pressure is applied and held, it forms a fold as shown in FIG. 4 and becomes firmly on the axis. Coupled with the flexibility of the material of the valve body,
As shown in the upper half of FIG. 2, the sealing function is fully expressed.

When the valve is opened, the compressed air that was pressurizing and sealing the valve is transferred to the connection part 4.
When the pressure is further reduced, the valve body 5 releases its seal, and as the pressure continues to decrease, the valve body 5 is sucked toward the inner cylinder 3, and as shown in the lower half of FIG. When it comes into close contact with the cylinder 3, the valve passage is fully opened.

As seen in this embodiment, the fold reading part and the fold forming part may be formed by pasting a sheet of a similar material to the flexible sheet surface of the valve body 5, or may be created as part of the braiding process. good. However, when changing the flexibility based on the difference in thickness, it goes without saying that the thickened portion should be positioned on the outer cylinder side.

〔effect〕

Since the powder valve of the present invention closes when pressurized and opens using reduced pressure, (1) Even if the pressure inside the closed hopper to which the valve of the present invention is connected is below atmospheric pressure, (2) Since the valve opens with reduced pressure, there is no need for the valve body to have repulsive force, and flexible materials can be used. This means that 0.5-2 kg/cn? There are the following effects: sufficient valve closing can be obtained with a low level of pressurizing force.

Furthermore, in the present invention, (3) since a flexible material is used and has a sealing function over a long span with low pressure, the sealing ability will not deteriorate even if a lump is bitten; When valving, the valve passage opens to the same effective cross section as the inner diameter of the connecting pipe, and there are no protrusions inside, so no blockages occur during powder flow; , there are no rotating or sliding parts, and there are no penetration parts with the outside, so there are fewer elements that can cause failures. (7) When the valve is opened, the valve passage opens to the same inner diameter as the connected pipe (so cleaning and drying is easy), etc. It has excellent effects and has great industrial applicability.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the combination conditions of the outer cylinder and the valve body, Fig. 2 is a longitudinal sectional view of one embodiment of the present invention, Fig. 3 is an explanatory diagram of the development of the valve disc, and Fig. 4 is the state when the valve is closed. FIG. 3...Inner cylinder 3"...Small hole 4...Connection part 5...Valve body 6...Tight part 11.12.13...Folding forming part 21.22, 23...・Fold reading section 1...Powder valve 2...Outer tube Figure 1 Figure 3 Figure 4 Figure 2

Claims (1)

[Scope of Claims] 1. In a valve for powder that opens and closes a valve body by the action of fluid pressure, an outer cylinder made of a material with high rigidity contains a soft and highly flexible airtight cylinder having a common axis. A cylindrical valve body is installed, and both ends of the outer cylinder and both ends of the valve body are sealed so that a sealed space is formed between the inner surface of the outer cylinder and the outer surface of the valve body, and the sealed space is When pressurized with pressurized fluid, the pressure toward the axis causes the valve body to fold into pleats in three or more directions on the plane perpendicular to the axis, and as the pressure is reduced, the valve body expands into a cylindrical shape on the plane perpendicular to the axis. A valve for powder, characterized by the following structure.