JP2000145988A - Air operation switch valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air operation switch valve operated without using any power sources and installed in water when it is applied to a sewage purifier or the like. SOLUTION: An air operation switch valve 6 connects a pipe 2 with an aeration air carrier pipe 62 when no air pressures is supplied from a branch pipe 8, and connects pipes 2 and 4 with a reverse washing air carrier pipe 65 when there is the air pressure is supplied from the branch pipe 8. Thus, the air operation switch valve 6 is switched according to the existence of the air pressure in the branch pipe 8. The air operation switch valve 6 is switched by moving a piston having a through-hole formed therein by the elongation/ contraction of a bellows, or based on a pressure difference caused by area difference between the left and right end surfaces of the piston.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-operated switching valve, and more particularly, to an air-operated switching valve that is preferably disposed in a flow path for injecting compressed air into a liquid.

[0002]

2. Description of the Related Art Septic tanks for cleaning sewage have been widely used. As shown in FIG. 6, the septic tank includes, for example, a first sedimentation separation tank 51 and a second sedimentation separation tank 52 to which sewage is supplied.
A contact aeration tank 53 to which sewage from which solids and the like have been removed in 52 is supplied, and a sedimentation tank 54 for precipitating a clump of microorganisms (sludge) purified from the sewage in the contact aeration tank, and are cleaned. The supernatant water of the settling tank 54 is disinfected and discharged from the outlet.

The contact aeration tank 53 has a contact filter medium 53a.
Is provided, and aerobic microorganisms attached to the surface of the contact filter medium 53a are passed from a blower (blower) 60 to a switching valve 6.
1. Propagate by aeration air sent through pipe 62 and diffuser 63, and decompose organic matter in sewage. In order to clean the contact filter medium 53a in the contact aeration tank 53, the switching valve 61 is switched, for example, for a predetermined short period of time during a day, periodically or irregularly, and the blower 6 is blown.
From 0, air for backwashing is supplied to the contact filter medium 53a through the switching valve 61, the pipe 65, and the diffuser 66.

Conventionally, as the switching valve 61, an electromagnetically operated three-way switching valve is frequently used. The electromagnetically operated three-way switching valve switches the air discharged from the blower 60 from, for example, a pipe 62 to a pipe 65 by turning on and off the current supplied to the valve.

[0005]

The conventional electromagnetic actuation 3
The one-way switching valve requires a power source to operate the one-way switching valve, which increases the cost. When the three-way switching valve is applied to the piping of the septic tank, the three-way switching valve is not used. Since the valve cannot be provided underwater, there is a problem that the restriction on the piping is large.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems of the prior art, and to operate the apparatus without using a power supply.
Another object of the present invention is to provide an air-operated switching valve that can be installed in water when applied to a septic tank or the like.

[0007]

In order to achieve the above object, the present invention provides an air-operated switching valve for switching a discharge flow path of air sucked from a suction flow path. A cylinder chamber communicating with the flow path, a piston-shaped member movable in the cylinder chamber, having a through hole connecting the suction flow path and the discharge flow path, and switching the discharge flow path in accordance with a stop position thereof; And the movement of the piston-like member is controlled by the air pressure in the branch from the suction flow path.

According to this feature, since the valve can be switched by air pressure, compared with the conventional electromagnetic switching valve,
A power supply is not required, and the configuration can be made at low cost. Further, since the air-operated switching valve can be arranged underwater, the degree of freedom in routing a pipe connected to the air-operated switching valve is increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram of a switching valve circuit according to one embodiment of the present invention.

This embodiment shows a switching valve circuit when a switching valve is applied to a septic tank. An aeration blower 1 is connected via a pipe 2, while a backwashing blower 3 is connected via a pipe 4 and a check valve 5. And is connected to the air operated switching valve 6 of the present invention. The air operated switching valve 6
Is, for example, the air transport pipe 6 for aeration described with reference to FIG.
2 and an air transport pipe 65 for reverse cleaning.
A branch pipe 8 is attached to the pipe 4 via a high-speed operation valve 7, and the branch pipe 8 is connected to the air-operation switching valve 6.

In the septic tank, generally, as shown in FIG. 5, the aeration blower 1 is operated continuously for one day (24 hours), and the short time t1 for one day is performed. ~ T2
The backwashing blower 3 is operated only for 10 minutes, for example. In this embodiment, the blower 1 for aeration and the blower 3 for reverse cleaning have the same discharge capacity, for example, 40 liters / min.

Next, an embodiment of the air operated switching valve 6 will be described with reference to FIG. FIG. 2 shows a cross-sectional view of the air operated switching valve 6. The air-operated switching valve 6 includes a bellows chamber 11 and a cylinder chamber 12 as illustrated.
The bellows chamber 11 is provided with a bellows 14 which expands and contracts when air is supplied from a connection port 13 connected to the branch pipe 8. The bellows 14
An operating rod 16 of a piston 15 is fixed to an end opposite to the connection port 13, and the piston 15 moves right and left according to expansion and contraction of the bellows 14.

The casing 10 has a suction port 17 for sucking air sent from the aeration blower 1 or the backwashing blower 3 so as to communicate with the cylinder chamber 12, and an aeration air transport pipe. An aeration port 18 connected to 62;
A backwash port 19 connected to the backwash air transport pipe 65 is provided. Further, the piston 15 is provided with a through hole 15 a having a diameter equal to or larger than the diameter of at least the suction port 17, the aeration port 18, and the backwash port 19, and the through hole 15 a is a first hole of the piston 15. At the position (position of FIG. 2 (a)), it communicates with the aeration port 18 and at the second position (FIG. 2 (b)).
The position (2) is configured to communicate with the reverse washing port 19.

Next, the operation of this embodiment will be described. When the blower for aeration 1 is operated and the blower for backwashing 3 is not operated, no compressed air enters the pipe 4 of FIG. 1, so that the check valve 5 and the high-speed operation valve 7 are closed, and the air operation switching valve 6 No compressed air enters the bellows 14. Therefore, the bellows 14 of the air operated switching valve 6
2A is contracted as shown in FIG. 2A, and the through hole 15a of the piston 15 communicates with the aeration port 18. Therefore, the compressed air discharged from the aeration blower 1 is sent to the aeration air transport pipe 62 through the pipe 2, the suction port 17, the through hole 15a, and the aeration port 18.

On the other hand, when both the blower for aeration 1 and the blower for backwashing 3 are operated, the check valve 5 and the high-speed operating valve 7 are opened, and the discharge from each of the blower for aeration 1 and the blower for backwashing 3 is performed. The compressed air that has been merged reaches the suction port 17 of the air operated switching valve 6 and
The compressed air from the backwashing blower 3 is supplied to the high-speed operating valve 7,
The air enters the bellows 14 of the air operated switching valve 6 through the branch pipe 8 and the connection port 13. For this reason, bellows 14
Is extended as shown in FIG.
a communicates with the backwash mouth 19. Therefore, the compressed air discharged from each of the aeration blower 1 and the backwashing blower 3 is supplied to the backwashing air transport pipe 65 through the suction port 17, the through hole 15a, and the backwashing port 19. You.

As described above, the air-operated switching valve according to the present embodiment operates with the pressure of the compressed air from the blower without the need for an electromagnetic force, and therefore does not require a power source or the like and can be configured at low cost. Further, since the air-operated switching valve does not require an electric wire for flowing an electric current, it can be placed, for example, in the water of a septic tank. Therefore, it is not necessary to place the switching valve on the ground around the septic tank, and the space on the ground which has been conventionally used for placing the switching valve can be saved.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a conceptual diagram of a switching valve circuit according to the present embodiment, and FIG. 4 is an example of an air-operated switching valve.

The aeration blower 1 is connected via a pipe 21 to an air operated switching valve 24. On the other hand, the backwashing blower 3 is connected to an air operation switching valve 24 via a check valve 22 and a pipe 23. The pipe 2
3 is provided with a branch pipe 23a, and as described later, the air operation switching valve 24 is switched by the air pressure of the branch pipe 23a. 62 and 65 are the same as in FIG.
The air transport pipe for aeration and the air transport pipe for backwashing are shown.

Next, the detailed structure of the air operated switching valve 24 will be described with reference to FIG. The air operation switching valve 24 includes a cylinder chamber 24a and a piston 24b configured to be movable left and right in the cylinder chamber 24a.
The piston 24b has an air communication hole 24c formed of a hole extending in the center of the piston 24b in the axial direction and a hole extending in a direction perpendicular to the hole as shown in the drawing. Further, the area of the right end side wall 24d of the piston 24b is formed to be smaller than the area of the left end side wall 24e.

Now, when the compressed air discharged from the aeration blower 1 enters the air-operated switching valve 24 via the pipe 21, the piston 24b is pushed to the left by the compressed air, as shown in FIG. Stop at the position shown in. Therefore, the pipe 21 and the aeration air transport pipe 62 communicate with each other through the air communication hole 24c.

Further, when the backwashing blower 3 for discharging the compressed air having the same pressure as that of the aeration blower 1 operates, the compressed air discharged from the backwashing blower 3 passes through the check valve 22 and the pipe 23 and the pipe 23. It enters the branch pipe 23a.
Then, the compressed air entering the branch pipe 23a presses the left end side wall 24e having a large area of the piston 24b, so that the piston 24b moves to the position shown in FIG. For this reason, the pipes 21 and 23 are
The compressed air discharged from the blower for aeration 1 and the blower for reverse cleaning 3 is connected to the inside of the air-operated switching valve 24 and communicates with the reverse-cleaning air transport pipe 65 through the air cleaning pipe 65. Transported to

As described above, also in this embodiment, similarly to the pneumatic operation switching valve of the first embodiment, it can be constructed at a low cost and can be arranged underwater. Also, the first
Since the bellows as in the embodiment is not required, the production is simple and the life can be extended.

[0023]

As is apparent from the above description, according to the present invention, since the valves can be switched by air pressure, an inexpensive switching valve can be provided. Further, since the air operated switching valve of the present invention can be arranged underwater, the degree of freedom in laying a pipe connected to the air operated switching valve is increased.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a switching valve circuit according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the air-operated switching valve of the embodiment.

FIG. 3 is a conceptual diagram of a switching valve circuit according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of the air-operated switching valve of the second embodiment.

FIG. 5 is a diagram showing blower air amount characteristics when the septic tank is aerated and when it is backwashed.

FIG. 6 is an explanatory view of a conventional septic tank and a switching valve used for the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Blower for aeration, 2, 4 ... Pipe, 3 ... Blower for backwashing, 6 ... Air operation switching valve, 7 ... High speed operation valve,
Reference numeral 8: branch pipe, 10: housing, 11: bellows chamber, 12: cylinder chamber, 13: connection port, 14: bellows, 15: piston, 15a: through hole, 17: suction port, 18: aeration port, 19 ... Backwash mouth, 21, 23 ... Pipe, 24 ... Air operated switching valve, 23a ... Branch pipe, 24a ... Cylinder chamber,
24b: piston, 24c: air communication hole, 24d, 24
e: side wall, 62: air transport pipe for aeration, 65: air transport pipe for backwashing.

Claims (5)

[Claims] 1. An air-operated switching valve for switching a discharge flow path of air sucked from a suction flow path, comprising: a cylinder chamber communicating with the suction flow path and the discharge flow path; A through-hole connecting the suction flow path and the discharge flow path, and a piston-like member that switches the discharge flow path in accordance with a stop position of the through-hole. An air-operated switching valve, wherein movement of a piston-shaped member is controlled. 2. The air-operated switching valve according to claim 1, wherein an extendable bellows is connected to one end of the piston-like member, and the branch path is connected to the bellows, and air pressure from the branch path is used to connect the bellows. An air-operated switching valve, characterized in that the piston is moved by expanding and contracting a bellows. 3. The pneumatically operated switching valve according to claim 1, wherein areas of opposite ends of the piston-like member are made different,
An air-operated switching valve, wherein the piston-like member is moved by a pressure difference between the two ends. 4. The air-operated switching valve according to claim 1, wherein the suction flow path includes two flow paths, one of which applies pressure to one end of the piston-like member, and the other of the flow paths. An air-operated switching valve, wherein the passage exerts pressure on the other end of the piston-like member. 5. The air-operated switching valve according to claim 1, wherein when the piston-like member stops at a predetermined position, air from a plurality of suction passages is merged into one. An air-operated switching valve, which is discharged to a discharge passage.