JP2530379Y2 - Valve for fine flow adjustment of air - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention is applied to an air supply line, an air lift pump, and the like provided in an aeration-type septic tank for treating human waste and a combined treatment tank for treating gray water such as human waste and kitchens. The present invention relates to a fine flow rate adjusting valve capable of finely adjusting the flow rate of air.

[0002]

2. Description of the Related Art Generally, in a domestic aeration type septic tank or a combined treatment tank, an air lift pump including a lift pipe for transferring sewage and an air supply pipe, and an air for aeration treatment in the tank. An air supply mechanism including an air diffuser pipe and an air supply pipe for supplying air is provided. Thus,
A manual opening / closing valve such as a globe valve is provided in the air supply pipe of the air lift pump or the air supply mechanism to adjust the flow rate of air. Also, for this open / close valve, it is necessary to adjust the amount of air supplied to the air lift pump and air diffuser according to the amount of wastewater treated.
What can fine-tune the amount of air is required.

[0003]

By the way, in the conventional on-off valve, when the amount of air is reduced, the gap between the valve seat and the valve body is reduced to reduce the amount of air. However, in the conventional valve, even if the gap between the valve seat and the valve body is reduced, the gap formed between the valve seat and the valve body has an annular shape, so that a large amount of air is inevitably generated in the gap between the valve seat and the valve body. Therefore, there is a problem that the air amount cannot be finely adjusted. On the other hand, in the field of valves, many open / close valves capable of finely adjusting the flow rate have been developed and widely used. For example, by using a gear-type reduction mechanism to reduce the number of revolutions of the valve handle, the stroke of the valve stem is finely adjusted by using a valve or an actuation screw mechanism that finely adjusts the stroke of the valve body. Developed valves and the like have been developed and used. However, each of these valves has a complicated structure and a large size, and there are many problems such as an increase in manufacturing costs.Therefore, air provided in an aeration type septic tank for home use or a combined treatment tank is used. In fact, it is not used for lift pumps, air supply mechanisms, and the like.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a valve for adjusting a minute flow with a simple structure.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a valve chamber having a bottom surface.
Provide an annular valve seat and communicate with the valve chamber via the valve seat.
To the valve chamber without through the fluid inlet and valve seat
Body with a fluid inlet and a bon covering the valve chamber of the body
It is rotatably supported while inserted into the net and the hood
And the stem attached to the upper end of the stem.
The handle for rolling operation and the lower end of the stem arranged in the valve chamber
The valve seat moves up and down when the stem rotates.
And a valve body that is separated from
In order to achieve the purpose of
The contact surface that moves up and down with only the surface in contact with the valve seat
And traverse the hit surface as you go upwards
By forming a vertical groove whose area is gradually reduced,
Air flows when the sliding surface is in surface contact with the valve seat.
From the body entrance to the inside of the groove in the direction where its cross-sectional area becomes smaller
Micro flow of air configured to pass through and flow out to the valve chamber
It proposes a valve for adjusting the amount.

[0006]

When the handle is rotated and the stem is turned in the valve closing direction, the valve body attached to the lower end of the stem is lowered, and the contact surface thereof is seated on the valve seat. As a result, the valve is closed. At this time, the contact surface between the valve seat and the valve element is in a surface contact state. When the handle is rotated to rotate the stem in the valve opening direction, the valve body attached to the lower end of the stem rises, and the contact surface separates from the valve seat.
As a result, the valve is opened. When finely adjusting the flow rate of the air, the handle is rotated by a small amount from the valve-closed (fully closed) state, and the stem is rotated by a small amount in the valve opening direction. As a result, the valve body rises by a small amount, and the contact surface rises in a state in which the valve body remains in surface contact with the valve seat for a fixed stroke. At this time, since the vertical groove is formed in the contact surface, the fluid inlet side of the body and the valve chamber are communicated by the groove, and the air flowing in from the fluid inlet passes through the groove in the contact surface. Into the valve chamber,
It flows from the valve chamber to the fluid outlet side. As a result, only a small amount of air flows, and the amount of air can be finely adjusted.
In particular, since the cross-sectional area of the groove on the contact surface is made smaller gradually as going upward, when the valve body is moved up and down with the contact surface in contact with the valve seat, the groove of the groove is formed. Since the cross-sectional area changes sequentially, the amount of air can be adjusted very finely.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 are longitudinal sectional views showing a closed (fully closed) state and an opened (fully open) state of a valve for adjusting a minute flow rate according to a first embodiment of the present invention. It is interposed in an air supply pipe such as a pump, and has a body 1, a bonnet 2, a stem 3, and a handle 4
, A fixing nut 5, an O-ring 6, and a valve body 7.

The body 1 is formed in a substantially inverted T-shape by a plastic material such as polyvinyl chloride, and has a fluid inlet 1a and a fluid outlet 1b on both sides and a fluid inlet 1 on an upper portion.
a and a concave valve chamber 1c which is open at the top and communicates with the fluid outlet 1b. An annular valve seat 1d is formed integrally with the body 1 on the bottom surface of the valve chamber 1c. The valve seat 1d has an annular straight surface 1d 'and a straight surface 1d' as shown in FIG. and continuously provided to shaped tapered face 1d of inverted tooth "respectively are provided. However, the fluid
The inlet 1a communicates with the valve chamber 1c via the valve seat 1d.
The fluid outlet 1b is connected to the valve chamber 1c without passing through the valve seat 1d.
Is communicated to. Therefore, the fluid in the body 1
The valve passes through the valve seat 1d upward from the inlet 1a to reach the valve chamber 1c.
And a series of air from the valve chamber 1c to the fluid outlet 1b.
A flow path will be formed. Further, a vertical guide groove 1e is formed on the inner peripheral surface of the valve chamber 1c so as to move up and down while a valve body 7 described later is stopped from rotating.
In this embodiment, the valve seat 1d is formed integrally with the body 1. However, the valve seat 1d may be formed separately from the body 1, and the two may be combined.

The bonnet 2 is formed in a cap shape from a plastic material such as polyvinyl chloride, and is fixed to the body 1 so as to cover the valve chamber 1c of the body 1. In the present embodiment, the bonnet 2 is composed of a cylinder 2a fitted to the body 1 and a lid 2b connected to the cylinder 2a and covering the valve chamber 1c, and press-fits the cylinder 2a into the body 1. Thus, it is fixed to the body 1. Further, a through hole 2c through which the stem 3 is inserted is formed at the center position of the lid 2b.

The stem 3 is formed in a substantially cylindrical shape by a plastic material such as ABS, and is rotatably inserted in the bonnet 2 and supported so as not to move in the axial direction. In this embodiment, the stem 3 comprises a shaft 3a rotatably inserted into the through hole 2c of the bonnet 2, and an annular groove 3b formed on the outer peripheral surface of the shaft 3a and into which the O-ring 6 is fitted.
An annular projection 3c formed on the outer peripheral surface of the shaft portion 3a and engaging with the lower surface of the lid portion 2b of the bonnet 2; and a square shaft portion connected to the upper end side of the shaft portion 3a and fitted with the handle 4. 3d,
An upper screw portion 3e connected to the square shaft portion 3d and formed with a male screw (right-hand screw) on the outer peripheral surface, and a male screw (left-hand screw) connected to the lower end side of the shaft portion 3a and formed on the outer peripheral surface. And a lower screw portion 3f. In the stem 3, the shaft 3a is inserted from the inside of the bonnet 2 into the through hole 2c of the lid 2b, and the handle 4 is fitted into the square shaft 3d protruding outward from the bonnet 2. By screwing the fixing nut 5 to the upper screw portion 3e, the fixing nut 5 is supported so as to be rotatable and axially immovable while being inserted into the bonnet 2.

The valve body 7 is formed in a cylindrical shape with a bottom by a plastic material such as polypropylene, and is attached to the lower end of the stem 3. When the stem 3 rotates, the valve body 7 moves up and down in the valve chamber 1 d to open and close the valve seat. 1d. In this embodiment, as shown in FIGS. 3 to 5, the valve element 7 includes a cylindrical portion 7 a having an internal peripheral surface formed with a female screw (left-hand thread) screwed to the lower screw portion 3 f of the stem 3, and a cylindrical portion. A vertically elongated guide projection 7b formed on the outer peripheral surface of the body 7a and slidably engaged with the guide groove 1e of the body 1, and a substantially dish-shaped bottom connected to the cylinder portion 7a and seated on and off the valve seat 1d. And a wall 7c. The bottom wall 7c of the valve body 7 is provided with a contact surface 7d that moves up and down in a state of contacting the valve seat 1d by a constant stroke to maintain the valve closed state, and the contact surface 7d is A straight surface 7d 'in surface contact with the straight surface 1d' of the valve seat 1d; and an inverted C-shaped tapered surface 7d "connected to the straight surface 7d 'and in surface contact with the tapered surface 1d" of the valve seat 1d. Consists of Furthermore,
On the straight surface 7d 'of the contact surface 7d, a vertical V-shaped groove 7e whose facing area decreases gradually as it goes upward is formed in opposition. In this embodiment, a contact surface 7d formed of a straight surface 7d 'and a tapered surface 7d "similar to the contact surface 7d formed on the bottom wall 7c is also formed on the cylindrical portion 7a of the valve body 7. The contact surface 7d is used when the diameter of the valve seat 1d is large, and may be omitted when the diameter of the valve seat 1d is small.
Is inserted into the valve chamber 1c with the guide projection 7b engaged with the guide groove 1e of the body 1, and the cylindrical portion 7a
Is screwed into the lower screw portion 3f of the stem 3. As a result, the valve element 7 moves up and down in the valve chamber 1c in a state where the valve element 7 is prevented from rotating with the rotation of the stem 3, and comes into contact with or separates from the valve seat 1d.

Next, the operation of the fine flow rate adjusting valve will be described. When the valve is to be closed, the handle 4 is turned clockwise (clockwise). Then,
The stem 3 fixed to the handle 4 rotates rightward without moving in the axial direction, and the valve body 7 screwed to the stem 3 descends while being prevented from rotating by the guide projection 7b and the guide groove 1e. And the contact surface 7d is the valve seat 1
d. As a result, the valve is closed (see FIG. 1). At this time, the straight face 7d 'of the valve element 7 is provided on the straight face 1d' of the valve seat 1d.
Since the tapered surface 7d "of the valve body 7 is in surface contact with the tapered surface 1d", the sealing is ensured. To open the valve, the handle 4 is turned to the left (counterclockwise). Then, the stem 3 fixed to the handle 4 rotates to the left without moving in the axial direction, and the valve element 7 screwed to the stem 3 is prevented from rotating by the guide projection 7b and the guide groove 1e. And the contact surface 7d is separated from the valve seat 1d. As a result, the valve is opened (see FIG. 2).
When the air amount is finely adjusted, the handle 4 is slightly turned leftward (counterclockwise) from the closed state shown in FIG. As a result, the stem 3 rotates slightly to the left without moving in the axial direction, and the valve element 7 screwed to the stem 3 moves the guide projection 7b and the guide groove 1b.
e, the tapered surface 7d "ascends by a small amount in a state where it is prevented from rotating, the tapered surface 7d" is separated from the tapered surface 1d "of the valve seat 1d, and the straight surface 7d 'faces the straight surface 1d' of the valve seat 1d. It will rise in a state of contact (see FIGS. 5 and 6). At this time, since the groove 7e is formed in the straight surface 7d 'of the valve body 7, the fluid inlet 1a side of the body 1 and the inside of the valve chamber 1c are communicated by the groove 7e, and the fluid flows in from the fluid inlet 1a. The generated air passes through the groove 7e of the straight surface 7d ', enters the valve chamber 1c, and flows from the valve chamber 1c to the fluid outlet 1b. As a result, only a small amount of air flows, and the amount of air can be finely adjusted. In particular, since the groove 7e of the straight surface 7d 'is made to gradually decrease in cross-sectional area as it goes upward, the valve body 7 is connected to the valve seat 1 by the straight surface 7d'.
If it is moved up and down in a state of surface contact with d, the groove 7e
Opening of the communication passage formed between the valve seat 1d and the valve body 7 on the valve chamber side.
The cross-sectional area of the air outlet, which is the mouth , slightly changes
This means that the air volume can be adjusted very finely.
it can. At this time, the contact surface 7d comes into surface contact with the valve seat 1d.
In the state where air is flowing, air flows from the fluid inlet 1a to the groove 7
e in the direction (upward) where the cross-sectional area decreases.
Flow to the valve chamber 1c.
-The valve chamber 1c passes through the communication passage gradually narrowing toward the outlet.
The air is compressed fluid.
Regardless, the amount of air flowing out increases the cross-sectional area of the air outlet.
It is increased or decreased appropriately according to the decrease, and the fine flow rate of air can be adjusted.
Can be done accurately.

FIG. 7 is a longitudinal sectional view of a valve for adjusting a minute flow rate according to a second embodiment of the present invention. The valve has a body 1 formed in a substantially L shape, and a fluid inlet 1a and a fluid outlet 1b. Are orthogonal to each other, and the other configuration is the same as that of the first embodiment. This valve can also provide the same functions and effects as those of the first embodiment.

FIG. 8 is a longitudinal sectional view of a valve for adjusting a minute flow rate according to a third embodiment of the present invention. The valve has a body 1 formed in a substantially inverted L-shape and a valve on the bonnet 2 side. The guide groove 2e of the body 7 is formed, and the contact surface 7d formed in the cylindrical portion 7a of the valve body 7 is brought into contact with and separated from the valve seat 1d. Other configurations are the same as those of the first embodiment. It has the same structure as the one. This valve can also provide the same functions and effects as those of the first embodiment. Note that the contact surface 7d formed on the bottom wall 7c of the valve body 7 can be omitted.

In the above embodiment, plastic materials (polyvinyl chloride and ABS) are used for each member of the valve. In other embodiments, metal materials are used for each member of the valve. Alternatively, both a plastic material and a metal material may be used.

In the above embodiment, the stem 3 is supported on the bonnet 2 so as to be rotatable and immovable in the axial direction.
Although the valve body 7 is moved up and down in a state where it is prevented from rotating,
In another embodiment, both the stem 3 and the valve body 7 may be rotatable and move up and down, respectively.

In the above embodiment, two grooves 7e are formed in the straight face 7d 'of the valve body 7. In other embodiments, one or three grooves 7e are formed in the straight face 7d'. More than one may be formed. However, when three or more grooves 7e are formed, it is necessary to reduce the size of each groove 7e so that a large amount of air does not pass.

In the above-described embodiment, the V-shaped groove 7e is formed in the straight surface 7d 'of the valve body 7. However, the shape of the groove 7e is not limited to that of the above-described embodiment. Any shape may be used as long as the shape gradually decreases as the area goes upward.

In the above embodiment, the valve body 7 is formed in a cylindrical shape with a bottom, and the bottom wall 7c is formed with a contact surface 7d consisting of a straight surface 7d 'and a tapered surface 7d ". The shape of the contact surface 7d is not limited to that of the above-described embodiment, but may be any shape as long as the contact surface 7d moves up and down in a state in which the contact surface comes in contact with the valve seat 1d for a fixed stroke. Is also good.

[0020]

As described above, the valve for adjusting a minute flow rate according to the present invention has a contact surface which moves up and down in a state in which the valve body comes into contact with and separates from the valve seat for a fixed stroke in surface contact with the valve seat. Since a vertical groove whose cross-sectional area is gradually reduced as going upward is formed in the contact surface, when the valve body is moved up and down in a state where the contact surface is in surface contact with the valve seat, the body is moved up and down. The fluid inlet and the valve chamber communicate with each other through a groove formed in the contact surface, and air passes through the groove at a small flow rate. As a result, the amount of air can be finely adjusted. In particular, since the cross-sectional area of the groove on the contact surface is made to decrease gradually as the cross-sectional area goes upward, that is, in the direction of air flow , the cross-sectional area of the groove changes sequentially as the valve body moves up and down, Extremely fine and accurate
It can be adjusted to. Also, the valve for fine flow rate adjustment of the present invention only forms a vertical groove on the contact surface of the valve body,
Since the flow rate of the air can be finely adjusted, the structure is extremely simple, and the manufacturing cost does not increase.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a closed state (fully closed state) of a valve for adjusting a minute flow rate according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an open (full open) state of the valve for fine flow rate adjustment.

FIG. 3 is an enlarged side view of a valve body of a valve for adjusting a minute flow rate.

FIG. 4 is an enlarged bottom view of a valve body of the valve for adjusting a minute flow rate.

FIG. 5 is a partially enlarged longitudinal sectional view showing a fine adjustment state of the fine flow rate adjustment valve.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a longitudinal sectional view showing a closed state of a valve for adjusting a minute flow rate according to a second embodiment of the present invention.

FIG. 8 is a longitudinal sectional view showing a closed state of a valve for adjusting a minute flow rate according to a third embodiment of the present invention.

[Explanation of symbols]

1 is a body, 1a is a fluid inlet, 1b is a fluid outlet, 1c is a valve chamber, 1d is a valve seat, 2 is a bonnet, 3 is a stem, 4 is a handle, 7 is a valve body, 7d is a contact surface, and 7e is a contact surface. Groove

Claims (1)

(57) [Scope of request for utility model registration] 1. An annular valve seat is provided on the bottom surface of a valve chamber.
The fluid inlet and the valve seat communicated with the valve chamber through the valve seat
A body provided with a fluid inlet communicated with the valve chamber without interposition, a bonnet covering the valve chamber of the body, a stem rotatably supported in a state of being inserted into the bonnet, and a stem mounted on the upper end of the stem. A handle to rotate,
Attached to the lower end of the stem disposed in the valve chamber, a valve body to abut away seating on the valve seat to move up and down during rotation of the stem, the
In the valve provided, the valve body has a contact surface which moves up and down in a state of being in surface contact with the valve seat for a certain stroke.
And a vertical groove is formed in the contact surface such that the cross-sectional area gradually decreases as going upward,
When the surface is in surface contact with the valve seat, air
Pass the inside of the groove from the entrance in the direction of decreasing the cross-sectional area.
A valve for adjusting a fine flow rate of air, characterized in that the valve is configured to pass through to a valve chamber .