JP3150596B2 - valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a washing function capable of satisfactorily removing deposits such as powder adhering to an outer peripheral surface of a valve body and an inner peripheral surface of a valve seat which come into contact with each other to form a sealing surface. For valves.

[0002]

2. Description of the Related Art Conventionally, as this type of valve, for example, there is one as shown in FIG.

That is, this conventional valve is applied to a filter dryer, and includes a casing 12a fixed to a lower side surface of a tank body 1a, a valve seat 14a provided in the casing 12a, A valve 23a is provided to be reciprocally movable by a hydraulic cylinder 28a to open and close the flow hole 15a of the seat 14a.

[0004] The valve body 23a is operated by a hydraulic cylinder 28a.
Is opened, the product powder deposited on the tank body 1a flows out of the casing 12a through the circulation hole 15a of the valve seat 14a by the rotating stirring blade, and the chute 13 provided on the lower surface thereof
a is discharged to the outside.

When the powder is discharged in this manner, the powder adheres to the inner peripheral surface of the valve seat 14a and the outer peripheral surface of the valve body 23a. Hole 15
is closed by the valve body 23a, the sealing performance is impaired by the biting of the powder, and the valve seat 14a and the valve body 23a are closed.
a is damaged and its life is shortened. Therefore, conventionally, an operator opens an inspection hole (not shown) provided on the side surface of the casing 12a,
The powder adhered by hand was wiped off and removed.

[0006]

However, the above-mentioned conventional manual cleaning is extremely complicated, so that a heavy burden is imposed on the operator and the cleaning efficiency is very poor. This was a factor that hindered the automation of the discharge process in the filter dryer.

SUMMARY OF THE INVENTION Therefore, the present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to reliably and efficiently wash the deposits such as powder on a valve seat and a valve body. That is the task.

[0008]

That is, a means adopted by the present invention to solve the above-mentioned problems is that the inner peripheral surface of the flow hole 15 is formed in a tapered shape in which the diameter is reduced toward one end side, and the flow hole 15 is formed in a radial direction. The valve seat 14 has a fluid introduction hole 17 formed therethrough, and an outer peripheral surface corresponding to the inner peripheral surface of the valve seat 14 so as to contact the inner peripheral surface of the valve seat 14 to close the flow hole 15. And a reciprocatingly provided valve element 23, and as the gap 31 between the outer peripheral surface of the valve element 23 and the inner peripheral surface of the valve seat 14 decreases during the closing operation of the valve element 23, The fluid that is ejected from the fluid introduction hole 17 into the gap 31 and increases in flow velocity pressure removes the deposits attached to the inner and outer peripheral surfaces, and the valve seat 14 and the valve body 23
And sealing means are provided at two places and are provided by the valve body 23.
When the flow hole 15 is closed, the fluid introduction hole 17 of the valve seat 14
And between the valve means 23 and the valve body 23
When the hole 15 is closed, the flange 26 that contacts the inner wall surface of the valve seat 14 is a valve body.
23, and the sealing means is provided with the flange portion 26 of the valve body 23 or the
An inner wall surface of the valve seat 14 with which the flange 26 abuts, and one end of the valve body 23
The O-rings 21 and 25 are respectively mounted on the outer peripheral surfaces .

Therefore, in the valve characterized by the above-mentioned structure, when the powder or the like adhered to the outer peripheral surface of the valve body 23 or the inner peripheral surface of the valve seat 14 is removed and washed, the valve body 23 is closed. When a fluid such as air is ejected from the fluid introduction hole 17 of the valve seat 14 during operation,
The fluid flows over the entire circumference of the gap 31 between the outer peripheral surface and the inner peripheral surface of the valve seat 14 so as to spread in the radial direction by hitting the outer peripheral surface of the valve body 23. It is scattered and removed.

In this case, since the inner peripheral surface of the valve seat 14 and the outer peripheral surface of the valve element 23 are each formed in a tapered shape, the gap 31 gradually decreases when the valve element 23 is closed. become. Therefore, since the flow velocity of the fluid flowing through the gap 31 gradually increases, the deposits can be satisfactorily removed by the flow velocity pressure of the fluid.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the valve according to the present invention is applied to a filter dryer will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a bell-shaped housing-shaped tank main body, and a rotary shaft 4a rotatably driven by a motor 2 and movable up and down by a hydraulic cylinder 3 in the center of the inside thereof.
And a plurality of blades 4b provided at the lower end of the rotating shaft 4a.

Reference numeral 6 denotes a lower lid for closing a lower opening of the tank body 1, a filtrate outlet 7 is provided at the center thereof, and a filter medium 9 is provided on the lower lid 6 through a filter plate 8. Is arranged. Reference numeral 10 denotes a jacket provided on the outer peripheral surface of the tank body 1.

Numeral 11 denotes a powder discharge valve mounted on the lower side surface of the tank body 1, and has the following structure as shown in FIG. That is, in the figure, 12 is a box-shaped casing,
On its lower surface, a chute 13 is provided. Reference numeral 14 denotes a valve seat attached to one side surface of the casing 12, and an inner peripheral surface of a flow hole 15 formed in the center is formed in a tapered shape whose diameter is reduced toward one end, and a flange portion protruded from the other end. A valve seat body 18 in which a fluid introduction hole 17 is formed radially through 16 and an annular plug which is interposed between the valve seat body 18 and one side surface of the casing 12 to form an inner wall surface of the valve seat 14. An O-ring 21 is mounted and sealed in annular concave grooves 20 formed on both front and rear surfaces of the plug sheet 19 as shown in FIG. The part is fitted into a discharge hole 22 formed in the lower side surface of the tank body 1. Note that a plurality of fluid introduction holes 17 may be provided in the flange 16 of the valve seat body 18.

Reference numeral 23 denotes an inner peripheral surface of the valve seat 14 which is
A hollow valve body having an outer peripheral surface corresponding to the inner peripheral surface, i.e., a tapered outer peripheral surface whose diameter is reduced toward one end side, to close the inner peripheral surface. 24 is O
A ring 25 is mounted, and a flange 26 is provided at the other end of the valve seat 14 so as to be in contact with the rear surface of the plug sheet 19 of the valve seat 14. Concave like 27
Are formed over the entire circumference. In addition, the valve seat by the valve body 23
When the communication hole 15 of the valve 14 is closed, the fluid introduction hole 17 of the valve seat 14 is arranged between the O-rings 21 and 25.

Reference numeral 28 denotes a hydraulic cylinder fixedly inserted through the other side opposite to one side of the casing 12, and has a rod 29
Is fitted and covered with a stretchable bellows 30, and the tip is fixed to the center of the back surface of the valve body 23.

The present embodiment has the above configuration.
The raw material slurry put into the tank body 1 is subjected to a series of steps of filtration, spreading, washing, and drying to produce product powder A. When the powder A deposited in the tank body 1 is discharged to the outside Is performed as follows.

First, when the hydraulic cylinder 28 of the valve 11 is operated to open the valve body 23 as shown by the dashed line in FIG.
The powder A is stirred by the blade 4b of the stirring blade 5 rotating in the tank body 1.
Is discharged into the casing 12 through the flow hole 15 of the valve seat 14, falls from the chute 13 and is discharged to the outside.

When the discharge of the powder A is completed, the hydraulic cylinder 28 is operated to open the flow hole of the valve seat 14.
The valve 15 is closed by the valve element 23. During this closing operation, air is automatically ejected from the fluid introduction hole 17 of the valve seat 14 as shown in FIG. The air first flows into the concave portion 27 provided on the outer peripheral surface of the valve body 23. However, since the air is temporarily stored in the concave portion 27, the air flows uniformly in the circumferential direction. The air flows all around the gap 31 between the outer peripheral surface of the valve seat and the inner peripheral surface of the valve seat 14, and as a result, the air flows toward the inside of the tank body 1 and the inside of the casing 12. The attached powder A is scattered and removed.

In this case, since the inner peripheral surface of the valve seat 14 and the outer peripheral surface of the valve body 23 are formed in a tapered shape, the valve body 23
, The width of the gap 31 is gradually reduced. Therefore, the flow velocity of the air flowing through the gap 31 gradually increases, and immediately before the blockage, the inside of the tank body 1 and the casing 12 are closed.
The maximum flow velocity pressure is generated while the air flows inward, and a much more excellent cleaning effect can be obtained as compared with the case where the air is simply ejected to remove the deposits.

As a result, even if the valve body 23 is closed,
The powder A does not bite between the outer peripheral surface of the valve and the inner peripheral surface of the valve seat 14, and the valve body 23 and the valve seat 14 are not damaged, so that a good sealing property can be obtained for a long time. Can be maintained.

After the valve body 23 is closed, the fluid introduction hole
The sealing performance of the valve element 23 can be confirmed by increasing and maintaining the air pressure from 17. That is, the fluid introduction hole 17 and the concave portion
Block the air pressure at 27 and change the O-ring 2
Thus, it is possible to detect the leakage of air from the O.R.1,25, and confirm the replacement time of the O-rings 21,25 and the cleaning time of the valve seat 14. In this way, it is possible to check the effect of cleaning the sealing surface and the sealing performance.

Further, since the ejection of air from the fluid introduction hole 17 can be automatically controlled in conjunction with the closing operation of the valve 23, the opening and closing and cleaning of the valve 11 can be easily automated. This can greatly contribute to simplifying the work.

Further, since the valve 11 according to the present embodiment has a very simple structure as a whole, there is also a practical advantage that it can be manufactured easily and at low cost.

In the above-described embodiment, the concave portion 27 is provided on the outer peripheral surface of the valve body 23. However, the concave portion 27 is not necessarily provided, and may be omitted.

Further, the valve 11 according to the present invention is applicable not only to the filter dryer as in the above embodiment, but also to any specific application, and the adhered substance is not only powder but also slurry liquid or the like. Can be removed by washing.

Further, the fluid introduced into the fluid introduction hole 17 is:
In addition to a gas such as a liquid such as water, the design of each part of the valve 11 such as a sealing means can be freely changed within a range intended by the present invention.

[0028]

As described above, according to the present invention, at the time of closing operation in which the inner peripheral surface of the tapered valve seat and the outer peripheral surface of the valve element are brought into contact with each other, the gap between the inner and outer peripheral surfaces is reduced. Since the gap formed is reduced and the flow velocity of the air or the like jetted into the gap is increased, the powder or the like adhered to the inner and outer peripheral surfaces due to the flow velocity pressure of the air or the like is used. It is possible to reliably remove the adhered matter, and to achieve a remarkable effect that a much superior cleaning effect can be obtained as compared with a case where the adhered matter is simply removed by blowing air.

As a result, it is possible to prevent the deposit from being clogged in the state of being stuck between the valve seat and the valve body, thereby preventing the sealing performance of the two from being impaired or causing damage. This has the effect of being able to endure

Further, by maintaining the fluid pressure in the fluid flow section when the valve is closed, the sealing performance of the valve can be confirmed. Thereby, it is possible to know the replacement time of the O-ring and the cleaning time of the sealing surface, and there is also an effect that the valve can always function as having the best sealing performance.

Further, since the ejection of air or the like from the fluid introduction hole can be automatically controlled in conjunction with the closing operation of the valve body, opening / closing and cleaning of the valve can be easily automated and work can be performed. There is also a unique effect that can greatly contribute to simplification.

Further, since the entire structure of the valve according to the present invention is extremely simple as described above, a practical effect that the valve can be easily and inexpensively produced can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a filtration device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view showing an embodiment of the valve.

FIG. 3 is an enlarged front view of a main part including a partial cross section of the valve.

FIG. 4 is a partial cross-sectional front view of a filtration dryer showing a conventional example.

[Explanation of symbols]

 14 ... Valve seat 15 ... Flow hole 17 ... Fluid introduction hole 21 ... O-ring 23 ... Valve body 25 ... O-ring 26 ... Flange 27 ... Concave part 31 ... Gap

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 47/00-51/00 F16K 1/36-1/38 B08B 5/02

Claims (4)

(57) [Claims] A valve seat (14) in which an inner peripheral surface of a flow hole (15) is formed in a tapered shape whose diameter is reduced toward one end and a fluid introduction hole (17) is formed in a radial direction. An outer peripheral surface corresponding to the inner peripheral surface of the valve seat (14) was provided so as to abut on the inner peripheral surface of the valve seat (14) to close the flow hole (15), and was provided to be reciprocally movable. As the gap (31) between the outer peripheral surface of the valve body (23) and the inner peripheral surface of the valve seat (14) decreases during the closing operation of the valve body (23), the fluid introduction hole (17) Ri greens in the configuration in which deposits adhering to the inner peripheral surface by the fluid that is ejected velocity pressure increases the gap (31) is removed from the valve seat
(14) and sealing means for the valve element (23) are provided at two places;
When the flow hole (15) is closed by the valve body (23), the flow of the valve seat (14) is reduced.
A body introduction hole (17) is arranged between the sealing means,
Also, the valve seat (14) when the flow hole (15) is closed by the valve body (23).
A flange (26) that is in contact with the inner wall surface of the valve body (23) is provided on the valve body (23);
The sealing means is a flange (26) of the valve body (23) or the flange (26)
The inner wall surface of the valve seat (14) in contact with the outer periphery of one end of the valve body (23)
A valve comprising O-rings (21) and (25) mounted on respective surfaces . 2. A valve seat (14) in which an inner peripheral surface of a flow hole (15) is formed in a tapered shape whose diameter is reduced toward one end and a fluid introduction hole (17) is formed in a radial direction. An outer peripheral surface corresponding to the inner peripheral surface of the valve seat (14) was provided so as to abut on the inner peripheral surface of the valve seat (14) to close the flow hole (15), and was provided to be reciprocally movable. As the gap (31) between the outer peripheral surface of the valve body (23) and the inner peripheral surface of the valve seat (14) decreases during the closing operation of the valve body (23), The fluid introduced from the fluid introduction hole (17) into the gap (31) is configured to remove the deposits attached to the inner and outer peripheral surfaces by the fluid whose flow velocity pressure increases, and
A concave portion (27) is formed on the outer peripheral surface of the valve body (23) in the circumferential direction.
Valve characterized by comprising Te. 3. A sealing means for the valve seat (14) and the valve body (23) is provided at two places, and when the flow hole (15) is closed by the valve body (23), the valve seat (14) is closed. 3. A valve according to claim 2, wherein a fluid introduction hole (17) is arranged between said sealing means. 4. The valve body (23) is provided with a flange (26) that comes into contact with the inner wall surface of the valve seat (14) when the flow hole (15) is closed by the valve body (23), and the sealing means is provided. An inner wall surface of a flange portion (26) of the valve body (23) or a valve seat (14) with which the flange portion (26) abuts, and an O-ring ( The valve according to claim 3 , wherein the valve is (21) or (25).