JP2000283328A - Fluid controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid controller which can singly perform two-stage adjusting of a flow amount. SOLUTION: In this fluid controller 1, a valve bar moving means 8 for moving a valve bar 5 by a specified rate against energizing force of an elastic member 7 has followings. A disc-like fixation piston 17 is vertically unmovably attached to the valve bar 5. A cylindrical movable piston 18 is vertically movably attached to the valve bar 5. A fixation piston driving means 19 moves the fixation piston 17 against the energizing force of the elastic member 7. A movable piston driving means 20 moves the movable piston 18 whereby the fixation piston 17. A movable stopper 21 is arranged on top of the movable piston 18 for stopping the valve bar 5 at a specified position. A fixation stopper 14 is arranged on a fixation position of the fluid controller 1 for stopping the valve bar 5 at the specified position. It is thus possible to locate the valve bar 5 at one of a closing position, an opening position for a large flow amount, and an opening position for a small flow amount therebetween.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid controller, and more particularly, to a fluid controller capable of adjusting a flow rate in two stages.

[0002]

2. Description of the Related Art Conventionally, as a fluid control device for adjusting a flow rate in two stages, a first fluid controller having a flow path through which a large flow rate of fluid can flow and opening and closing the flow path, A second fluid controller having a flow path through which a fluid of a flow rate can flow and opening and closing the flow path is connected in parallel.
It is known to perform the operation by appropriately opening and closing the flow paths of two fluid controllers.

[0003]

In the conventional fluid control device, since space and piping for two fluid controllers are required, the required performance of reducing the installation area of the device and the volume of the flow path is satisfied. I couldn't do that.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fluid controller capable of performing two-step adjustment of a flow rate, although it is a single functional member having an appearance similar to that of a conventional fluid controller which could only perform one-step adjustment. Is to provide.

[0005]

SUMMARY OF THE INVENTION A fluid controller according to the present invention comprises: a valve box provided with a fluid passage;
A casing provided at the upper part of the valve box, a valve stem for vertically moving a valve body for opening and closing the fluid passage, an elastic member for urging the valve stem in a predetermined direction, and a valve stem against the urging force of the elastic member. In a fluid controller having a valve rod moving means for moving a predetermined amount, a valve rod moving means is fixedly mounted to the valve rod so as not to be vertically movable, and is movable to a valve rod so as to be vertically movable. Piston, fixed piston driving means for moving the fixed piston against the urging force of the elastic member, and movable piston driving means for moving the fixed piston via the movable piston by moving the movable piston in the valve stem axial direction; A movable stopper provided on the movable piston to stop the valve stem at a predetermined position, and a fixed stopper provided at a fixed portion of the fluid controller to stop the valve stem at a predetermined position, the valve comprising: The closed position is characterized in that can be positioned on either the low flow open position which is between the large flow open position and both of these positions.

According to the fluid controller of the present invention, the valve stem is
A first position when both the fixed piston driving means and the movable piston driving means are off, a second position when the fixed piston driving means is on, and a third position when the movable piston driving means is on. , Each position can be made to correspond to one of the closed position, the large flow open position, and the small flow open position, and two-stage adjustment of the flow can be performed.

It is preferable that the movable piston has a cylindrical shape having a bottom wall and a top wall, and the fixed piston is located inside the movable piston. With this configuration, the movable piston also serves as a cylinder for the fixed piston, and the two pistons can be compactly housed in the casing.

The elastic member urges the valve stem downward, and the valve stem is held in the closed position by the elastic force of the elastic member when the fixed piston driving means and the movable piston driving means are off, and When the driving means is turned on and abuts on the movable stopper, it is held at the small flow rate open position, and when the movable piston driving means is turned on and abuts on the fixed stopper, it is held at the large flow rate open position. The fluid controller configured as described above is a valve that is normally closed and can perform two-stage adjustment of the flow rate.
However, the fluid controller of the present invention may be a valve that is always held at the large flow rate open position and can perform two-stage adjustment of the flow rate.

The movable stopper is, for example, screwed into a female through-hole provided on the top wall of the movable piston so as to adjust the vertical position, and stops the movement of the valve stem by contacting the upper end of the valve stem. Is done. By doing so, fine adjustment of the flow rate at the time of a small flow rate can be performed by adjusting the vertical position of the movable stopper.

Preferably, the movable stopper has a flange protruding above the top wall of the casing, and an elastic member is preferably interposed between the flange and the top wall of the movable piston. With this configuration, rattling between the movable stopper and the internal thread portion is eliminated, and fluctuation of the flow rate at a small flow rate due to rattling is prevented.

The fixed piston driving means is for introducing compressed air into the small flow rate air introduction chamber formed between the bottom wall of the movable piston and the lower surface of the fixed piston, and is provided on the side of the bottom wall of the casing. A small flow port connected to a compressed air source; a passage in the casing bottom wall extending from the small flow port through the inside of the bottom wall of the casing to a peripheral edge of the bottom wall; and a peripheral wall of the casing from an outer end portion of the passage in the casing bottom wall. A passage in the casing peripheral wall that extends upward through the inside and has an upper end opening to the casing inner peripheral surface, and a movable piston that penetrates the movable piston peripheral wall and communicates with the small-flow rate air introduction chamber from the upper end opening of the casing peripheral wall passage. And a passage. However, the fixed piston driving means may be driven by a fluid other than air, or may be one using electromagnetic force.

The movable piston driving means is for introducing compressed air into a large flow rate air introduction chamber formed between the bottom wall of the casing and the bottom wall of the movable piston, and is provided on the bottom wall of the casing. A large flow port connected to the air source, and a passage in the casing bottom wall which communicates with the large flow rate air introduction chamber through the inside of the bottom wall of the casing from the large flow port are provided. However, the movable piston driving means may be driven by a fluid other than air, or may be one using electromagnetic force.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, a fluid controller (1) according to the present invention comprises a valve box (2) provided with a fluid inflow passage (2a) and a fluid outflow passage (2b), and a valve. Box (2) Bonnet (3) fixed to the upper part, casing (4) fixed to the upper end of the bonnet (3), and the upper part of the casing (4) The valve stem (5) and the fluid inflow passage as the valve stem (5) moves up and down
(2a) Opening / closing diaphragm (valve element) (6) and valve stem (5)
A compression coil spring (7) as an elastic member for urging the compression coil spring in a predetermined direction (downward in this embodiment);
Valve moving means (8) for moving the valve stem (5) in two stages against the urging force of (7), wherein the valve stem moving means (8) is configured as described later. Thus, the valve stem (5) can be positioned at one of the closed position, the large flow open position, and the small flow open position between these two positions. FIG. 1 shows when the valve stem (5) is in the closed position, FIGS. 2 and 3 show when the valve stem (5) is in the small flow open position, and FIG.
This shows the case where the valve stem (5) is in the large flow open position.

The lower end of the bonnet (3) is fitted into an upwardly open recess provided at the upper end of the valve box (2), and the bonnet nut (9) attaches the bonnet (3) to the valve box (2). Fixed. The casing (4) consists of a lower casing (10) that opens upward and an upper casing that opens downward.
(11) is integrated by screwing. The upper part of the bonnet (3) has a lower casing (1
The retaining ring (12) is fitted in the upper end of the bonnet (3), which is fluid-tightly inserted into the bonnet insertion hole provided in the bottom wall of the lower casing (10) and protrudes upward from the bottom wall of the lower casing (10). Thus, the hood (3) and the casing (4) are connected.

The lower end of the valve stem (5) is provided with a flange (5a). The inner diameter of the bonnet (3) is slightly larger at the upper end than at the valve stem (5) and at the lower end. Slightly larger than flange (5a) of rod (5), valve stem in middle
It is formed smaller than the flange portion (5a) of (5) and larger than the valve stem (5). As a result, the stem (5)
(3) is inserted in a fluid-tight manner and vertically movable through the upper end of (3), and the upper step is provided between the upper end and the intermediate part.
(13), between the lower end portion and the intermediate portion, the lower step portion (14)
Are formed. The compression coil spring (7)
It is housed in the inner peripheral portion of the intermediate portion of (3), and is received by the upper step portion (13) and the flange portion (5a) of the valve stem (5).

A diaphragm retainer (15) is fixed to the lower surface of the flange (5a) of the valve stem (5).
(6) shows the compression coil spring in the closed position shown in FIG.
By being held down by the diaphragm holder (15) urged downward by the elastic force of (7), the annular valve seat (16) provided at the opening of the fluid inflow passage (2a) of the valve box (2). It is imposed.

The valve rod moving means (8) comprises a fixed piston (17) mounted on the valve rod (5) so as not to be vertically movable, and a valve rod (5).
A movable piston (18) mounted to be able to move up and down,
Fixed piston drive means for moving the fixed piston (17) upward by air pressure against the urging force of the compression coil spring (7)
(19), movable piston drive means (20) for moving the fixed piston (17) upward by pneumatic pressure via the movable piston (18) by moving the movable piston (18) upward,
A movable stopper (21) provided on the movable piston (18) for stopping the valve stem (5) at a predetermined position, and a fixed stopper (bonnet) provided on the bonnet (3) for stopping the valve stem (5) at a predetermined position. (3) lower step) (14).

The movable piston (18) has a disc-shaped top wall (23) fitted into the top opening of the bottomed cylindrical body (22),
It is formed in a cylindrical shape having a bottom wall (22a) and a top wall (23), and is fitted in a casing (4) so as to be vertically movable and fluid-tight. The stem (5) is connected to the movable piston (1
The movable piston (18) is formed so as to extend upward through the bottom wall (22a) and to have a gap between the upper end thereof and the lower surface of the top wall (23) of the movable piston (18). In the closed position shown in FIG. 1, the movable piston (18) is a fixed piston integrated with a valve stem (5) which is urged downward by a compression coil spring (7).
By being pushed downward by (17), the annular lower protruding edge of the lower surface of the bottom wall (22a) is in contact with the upper surface of the bottom wall of the casing (4).

The fixed piston (17) is formed in a disk shape having an annular downward protruding edge, and the valve stem is formed by a retaining ring (24).
(5) attached to the upper end of the movable piston (18)
Are vertically and movably fitted in the internal space of the.

The fixed piston driving means (19) introduces compressed air into the small flow rate air introduction chamber (25) formed between the bottom wall of the movable piston (18) and the lower surface of the fixed piston (17). ,
A small flow port (26) provided on the side of the bottom wall of the casing (4) and connected to a compressed air source, and from the small flow port (26) through the inside of the bottom wall of the casing (4) to the periphery of the bottom wall. A casing bottom wall passage (27) that extends from the outer end portion of the casing bottom wall passage (27) to the inside of the peripheral wall of the casing (27), and the upper end extends upward to the casing (4) inner peripheral surface. A passage (28) in the casing peripheral wall, and a passage (29) in the movable piston that penetrates the peripheral wall of the movable piston (18) and communicates with the small-flow-rate air introduction chamber (25) from the upper end opening of the passage (28) in the casing peripheral wall. It has.

The movable piston drive means (20) includes a casing
(4) Compressed air is introduced into the large flow rate air introduction chamber (30) formed between the bottom wall and the movable piston (18) bottom wall, and is provided on the bottom wall of the casing (4) for compression. A large flow port (31) connected to an air source, and a passage (32) in the casing bottom wall that leads from the large flow port (31) through the inside of the bottom wall of the casing (4) to the high flow air introduction chamber (30). ).

The small flow port (26) and the large flow port (31) are provided at the same level. In this embodiment, as shown in FIG. 3, the large flow port (31) is connected to the casing (4). The small flow port (26) is located 90 ° counterclockwise as viewed from above the large flow port (31). Of course, the positional relationship between the small flow port (26) and the large flow port (31) can be changed according to the place where the fluid controller (1) is installed.

The movable stopper (21) has a cylindrical shape having a flange portion (34) at the upper end, and has a lower portion provided with a vertical female screw portion (33) provided on the top wall of the movable piston (18) to adjust the vertical position. It has a male thread (35) that can be screwed in. The penetrating female screw portion (33) and the movable stopper (21) have a shaft concentric with the valve stem (5).

The flange (34) of the movable stopper (21) projects above the top wall of the casing (4), and a screw is provided between the flange (34) and the top wall of the movable piston (18). A compression coil spring (elastic member) (36) for preventing rattling of the mating portion is interposed.

As the fixed stopper, a lower step (14) of a bonnet (3) adapted to abut against a flange (5a) of a valve stem (5) is used. The fixed stopper (14) can be variously modified as long as it is provided on the fixed portion of the fluid controller (1) and stops the valve stem (5) directly or via another member. For example, it may be provided on the casing (4), and the top wall of the casing (4) itself is a movable piston.
(18) may be stopped.

According to the fluid controller (1) of the present invention,
When compressed air is introduced from the small flow rate port (26) into the small flow rate air introduction chamber (25) while the flow path is closed, the fixed piston (17) is moved upward as shown in FIG. The valve stem (5) also moves upward. As a result, the stem (5)
The upper end contacts the lower end of the movable stopper (21). The movable piston (18) has its bottom wall (22a) pushed down by the same size as the fixed piston (17) pushed up by compressed air in the air introduction chamber (25) at a small flow rate. As a result, upward movement is prevented. Therefore, the movable piston (1
The movable stopper (21) fixed to 8) remains at that position without being moved upward by the valve stem (5), and the valve stem (5) is held at the small flow rate open position.

When compressed air is introduced from the large flow rate port (31) into the large flow rate air introduction chamber (30) when the flow path is closed, as shown in FIG. Moves upward, and the upper surface of the bottom wall (22a) of the movable piston (18) contacts the lower surface of the fixed piston (17). This allows the fixed piston
(17) moves upward integrally with the movable piston (18), and accordingly, the valve stem (5) also moves upward. As a result, the upper end of the valve stem (5) comes into contact with the lower end of the movable stopper (21). Since there is no compressed air in the air introduction chamber (25) at low flow rates, there is no air pressure pushing the movable piston (18) downward, and therefore the movable piston (18) and the fixed piston
(17) moves further upward. And the stem (5)
The flange (5a) moves upward until it contacts the lower step (14) of the bonnet (3), where it stops and is held at the large flow open position.

Thus, the fluid controller (1) according to the present invention
According to the above, by selecting either compressed air introduction from the small flow port (26), compressed air introduction from the large flow port (31) or no air introduction, the small flow open position, the large flow open position and the closed The valve stem (5) can be held in any of the positions.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a closed state of a flow path of a fluid controller according to the present invention.

FIG. 2 is a sectional view showing a small flow rate open state of the fluid controller according to the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a sectional view showing the fluid controller according to the present invention in a large flow rate open state.

[Explanation of symbols]

 (1) Fluid controller (2) Valve case (2a) Fluid inflow passage (4) Casing (5) Valve rod (7) Compression coil spring (elastic member) (8) Valve rod moving means (14) Lower step (Fixed stopper) (17) Fixed piston (18) Movable piston (19) Fixed piston drive means (20) Movable piston drive means (21) Movable stopper (25) Small flow air introduction chamber (26) Small flow port ( 27) Bottom wall passage (28) Peripheral wall passage (29) Movable piston passage (30) High flow air introduction chamber (31) Large flow port (32) Casing bottom wall passage (33) Internal threaded thread ( 34) Flange (36) Compression coil spring (elastic member)

Claims (7)

[Claims] 1. A valve box (2) provided with a fluid passage (2a),
Valve casing (2) Casing (4) provided at the top and fluid passage
A valve stem (5) for vertically moving a valve body (6) for opening and closing (2a);
An elastic member (7) for urging the valve stem (5) in a predetermined direction and a valve stem moving means (8) for moving the valve stem (5) by a predetermined amount against the urging force of the elastic member (7). In the fluid controller provided, a valve rod moving means (8) is mounted on a valve rod (5) so as to be vertically movable and a fixed piston (17) mounted on the valve rod (5) so as to be movable vertically. Movable piston (18) and fixed piston
(17) a fixed piston driving means (19) for moving the urging force of the elastic member (7), and a movable piston (18) by moving the movable piston (18) in the axial direction of the valve stem. Moving piston drive means (20) for moving the fixed piston (17)
A movable stopper (21) provided on the movable piston (18) to stop the valve stem (5) at a predetermined position; and a movable stopper (21) provided on a fixed portion of the fluid controller (1) to move the valve stem (5) to a predetermined position. And a fixed stopper (14) for stopping the valve shaft (5) so that the valve stem (5) can be positioned at any of a closed position, a large flow open position, and a small flow open position between these two positions. And a fluid controller. The movable piston (18) has a cylindrical shape having a bottom wall (22a) and a top wall (23), and the fixed piston (17) has
2. The device according to claim 1, wherein said movable piston is located inside said movable piston.
Fluid controller. 3. The elastic member (7) urges the valve stem (5) downward, and the fixed stem driving means (19) and the movable piston driving means (20) are turned off. Elastic member when
(7) is held at the closed position by the elastic force of the fixed piston drive means (19) is held at the small flow rate open position by contacting the movable stopper (21) when the fixed piston drive means (19) is on, and the movable piston drive means (20) 3. The fluid controller according to claim 2, wherein the large flow rate open position is maintained by contacting the fixed stopper when the switch is on. 4. The movable stopper (21) includes a movable piston (18).
The screw is screwed into the internal thread (33) provided on the top wall (23) so that the vertical position can be adjusted, and stops the movement of the valve stem (5) by contacting the upper end of the stem (5). 4. The fluid controller of claim 3, wherein 5. The movable stopper (21) has a flange (34) protruding above the top wall of the casing (4),
The fluid controller according to claim 4, wherein an elastic member (36) is interposed between the flange portion (34) and the top wall of the movable piston (18). 6. A fixed piston driving means (19) for introducing compressed air into a small flow rate air introduction chamber (25) formed between the bottom wall of the movable piston (18) and the lower surface of the fixed piston (17). A small flow port (26) provided on the side of the bottom wall of the casing (4) and connected to a compressed air source; and a small flow port (26) passing through the inside of the bottom wall of the casing (4) from the bottom wall. A passage (27) in the casing bottom wall leading to the peripheral portion and a passage (2
A passage (28) in the casing peripheral wall, which extends upward from the outer end portion of the casing (4) through the peripheral wall of the casing (4) and has an upper end opening on the inner peripheral surface of the casing (4), and a peripheral wall of the movable piston (18). The fluid controller according to claim 3, further comprising a movable piston passage (29) penetrating from the upper end opening of the casing inner wall passage (28) to the small flow rate air introduction chamber (25). 7. The movable piston driving means (20) introduces compressed air into the large flow rate air introduction chamber (30) formed between the bottom wall of the casing (4) and the bottom wall of the movable piston (18). Things
A large flow port (31) provided on the bottom wall of the casing (4) and connected to a compressed air source, and a large flow rate air introduction chamber from the large flow port (31) through the inside of the bottom wall of the casing (4). The fluid controller according to claim 3, further comprising a passage (32) in the casing bottom wall that communicates with the (30).