JP2579889B2 - Double seal valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully closed state in which both upper and lower valve bodies are closed, a fully opened state in which both upper and lower valve bodies are open, and a lower portion in which the upper valve body is closed and the lower valve body is open. The present invention relates to an air cylinder operated double seal valve that executes an open state or an upper part open state in which a lower valve body is closed and an upper valve body is opened.

[0002]

2. Description of the Related Art When used for a liquid which is difficult to clean such as a viscous liquid, it is necessary to close one of two valve bodies and slightly open the other to discharge the cleaning liquid to the outside while cleaning the packing part. It is. There are several types of double seal valves that meet such needs (for example, Japanese Patent Publication No. 63-58308).
Japanese Patent Application Publication No. Hei 4-41867), however, there were difficulties in reducing the weight, making it compact, and simplifying the structure.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel double seal valve which achieves a reduction in weight, size, and simplification of the structure.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, a double seal valve according to the present invention has a fluid inlet conduit and a fluid outlet conduit and between the fluid inlet conduit and the fluid outlet conduit. A valve housing having an upper valve seat and a lower valve seat in an up-and-down arrangement, an upper pipe portion provided on an upper surface of a cutting edge of the upper through hole by opening an upper through-hole at a position above the valve seat in the valve housing. A cylinder divided by an intermediate wall into upper and lower chambers provided at the upper end of the upper pipe portion, a first piston rod vertically penetrating the upper and lower chambers, and an upper and lower chamber at the first piston rod. A first piston and a second piston which are provided with middle / lower collars and which are vertically movable between the upper collar and the middle collar and between the middle collar and the lower collar, and between the first and second pistons; Point the first piston upward and the second piston A first coil spring inserted in a state of pressing downwardly, a first port provided in the upper end wall of the cylinder between the same wall and the first piston to supply and exhaust air, and an intermediate wall having the same wall. A lower end of the first piston rod is extended to the center of the upper and lower valve seats through the upper pipe portion, and is attached to the extension portion so as to be vertically movable. A tubular second piston rod, a third piston supported on the upper end of the second piston rod in the lower chamber so as to move up and down, a cylindrical hollow chamber provided on the inner peripheral surface of the second piston rod, A spring seat provided at a location in the cylindrical hollow chamber of one piston rod; a second coil spring wound between a lower surface wall of the cylindrical hollow chamber and a lower surface of the spring seat; a second coil spring weaker than the first coil spring; Same wall and 3rd piston A third port provided in a state where air is sent and exhausted therebetween, an upper valve body seated on the upper valve seat provided on a lower end of the second piston rod, and the lower valve seat provided on a lower end of the first piston rod And a lower valve body that is seated on the vehicle.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in the figures has an inlet conduit 1 and an outlet conduit 2 for the fluid and between these inlet conduits 1 and outlet conduits 2 an axial upper valve seat 3 and a cylindrical lower valve. A valve housing 5 having a seat 4 is formed, and an upper through hole 6 is opened at a position above the valve seats 3 and 4 in the valve housing 5, and an upper pipe portion 7 is provided on the upper surface of a cutting edge of the upper through hole 6. A lower through hole 8 is opened at a lower portion, and a lower tube portion 9 is provided on a lower surface of a cutting edge of the lower through hole 8, and an upper and lower two chambers 11 and 12 are formed at an upper end of the upper tube portion 7 by an intermediate wall 10. A separate cylinder 13 is provided,
A rod-shaped first piston rod 14 penetrating vertically through the upper and lower two chambers 11 and 12 is passed through the cylinder 13 and the lower end of the first piston rod 14 is connected to the center of the upper pipe 7 and the upper and lower valve seats 3 and 4. And the first piston rod 14
In the above, upper, middle and lower collars 15, 16 and 17 are provided in the upper chamber 11 of the cylinder 13 to
And a first piston 18 between the middle collar 16 and the lower collar 17, and a second piston 19 between the middle collar 16 and the lower collar 17 so as to be vertically movable. A first coil spring 20, which constantly presses the first piston 18 upward and the second piston 19 downward, is sandwiched.
A first port 22 for sending and exhausting air between the first and first pistons 18, and a second port 24 for sending and exhausting air between the same wall 10 and the second piston 19 on the intermediate wall 10, respectively. In the case where the air is exhausted from the first and second ports 22 and 24, the upper surface of the first piston 18 is
The lower surface of the first piston and the lower surface of the upper collar 15 are pressed against the upper surface of the intermediate wall 10 and the upper surface of the middle collar 16, respectively.

[0006] A tubular second piston rod 26 is vertically movably mounted on the first piston rod 14 at a location existing in the lower chamber 12, the upper pipe section 7, and the inlet conduit 1. A third piston 27 that moves up and down in the lower chamber 12 and engages with the locking portion 25 is supported at the upper end of the lower chamber 12, and a cylindrical hollow chamber 28 is provided on the inner peripheral surface of the second piston rod 26. A spring seat 29 is provided at a position existing in the cylindrical hollow chamber 28 of the cylinder 14 and a second piston weaker than the first coil spring 20 between the lower surface wall of the cylindrical hollow chamber 28 and the lower surface of the spring seat 29 in the first piston rod 14. The coil spring 30 is wound, and a third port 32 for sending and discharging air between the lower end wall 31 of the cylinder 13 and the third piston 27 is opened. If the state of being discharged from the preparative 32 so that the upper surface of the third piston 27 is pressed against the lower surface of the intermediate wall 10.

Further, an upper valve body 35 seated on the upper valve seat 3 is integrally provided at a lower end portion of the second piston rod 26, and an upper cleaning liquid reservoir is formed by making an inner diameter of an intermediate portion of the upper pipe portion 7 large. The upper cleaning liquid supply port 37 for the upper cleaning liquid reservoir 36 is formed in the wall of the intermediate portion at the intermediate portion, and the upper cleaning liquid reservoir 36 has an upper end on the joint surface between the upper valve body 35 and the second piston rod 26. The lower end is the same valve body 35
A cleaning liquid guide hole 38 is provided on the lower surface of the cleaning liquid. The cleaning liquid first outlet 47 and the center of the upper surface of the lower valve body 41 communicate with the cleaning liquid guide hole 38 and face toward the lower valve seat 4. A second cleaning liquid outlet 48 is provided.

Further, a downwardly directed washing liquid discharge pipe 40 which reaches the lower pipe section 9 through the outlet conduit 2 is connected to the lower end of the first piston rod 14, and the lower end of the lower side of the washing liquid discharge pipe 40 is connected to the lower side. The lower valve body 41 seated on the valve seat 4 is provided with a hollow hermetic cylindrical balance piston 42 which slides up and down along the inner peripheral surface of the lower tube portion 9 at the lower end. In the outer peripheral surface, the upper and lower valve bodies 35 and 41 are opened, the upper valve body 35 is opened, and the lower valve body 41 is opened only. A lower cleaning liquid flow path 43 having a width half that of the stroke of the balance piston 42 is formed on the inner peripheral surface of the lower cleaning liquid flow path 43, and a lower cleaning liquid supply port 44 is provided on an outer wall of the lower cleaning liquid flow path 43. Squeeze the nine walls Is obtained by forming a cleaning liquid discharge port 45 by narrowing the diameter squeezing likewise lower edge of the discharge gap 46 at the lower edge of the lower washing solution flow path 43 by proximity to the outer circumferential surface of the lance piston 42.

[0009]

When air is supplied from the first port 22 when the upper and lower valve bodies 35 and 41 are closed (fully closed state), the first piston 18 descends and first comes into contact with the middle collar 16. After that, descend further to the middle collar 16,
The first piston rod 14, the cleaning liquid discharge pipe 40, and the balance piston 42 are pressed down, so that the lower valve body 41 is opened while the upper valve body 35 is closed (see FIG. 4). (A state in which the lower side is partially opened for cleaning)

When air is supplied from the second port 24 when the upper and lower valve bodies 35 and 41 are closed, the second piston 19 rises and first comes into contact with the middle collar 16 (this contact). In this state, the upper portion of the lower valve body 41 is fitted into a recess 49 provided on the lower surface of the upper valve body 35 as shown in FIG. 3). The first piston rod 14, the cleaning liquid discharge pipe 40, the balance piston 42, the lower valve body 41, the second piston rod 26, and the upper valve body 35 are pulled up, and thus the upper and lower valve bodies 35, 41 are opened to enter the fluid. The conduit 1 and the outlet conduit 2 are in a communicating state (see FIG. 2). (Washing with fully open)

When air is supplied from the third port 32 when the upper and lower valve bodies 35 and 41 are closed, the third piston 27 engages with the locking portion 25 and rises to raise the second piston rod 26. And the upper valve body 35 is slightly pulled up, so that the upper valve body 35 is slightly opened while the lower valve body 41 is closed (see FIG. 5). (Washing with the upper side partially open)

When the cleaning liquid is supplied from the upper cleaning liquid supply port 37 in a state where both the upper and lower valve bodies 35 and 41 are closed, the cleaning liquid flows through the upper cleaning liquid reservoir 36 and the cleaning liquid guide hole 38.・ Lower side valve body 35, 41
The liquid enters the space therebetween and is further discharged from the cleaning liquid discharge port 45 through the cleaning liquid discharge pipe 40 (see FIG. 1). (Intermediate cleaning)

When the cleaning liquid is supplied from the lower cleaning liquid supply port 44 when the upper and lower valve bodies 35 and 41 are closed, the cleaning liquid enters the lower cleaning liquid flow path 43 and the balance piston in the same flow path 43. The cleaning liquid is discharged from the cleaning liquid discharge port 45 through a discharge gap 46 between the outer peripheral surface of the lower tube portion 9 and the inner peripheral surface of the lower tube portion 9.

[0014]

The double seal valve according to the present invention has a fluid inlet conduit and a fluid outlet conduit as described above and between the fluid inlet conduit and the fluid outlet conduit, the upper valve seat and the lower valve. A valve housing having seats arranged vertically, an upper pipe portion provided at an upper portion of a valve seat in the valve housing and provided on a cut line upper surface of the upper through hole, and an upper pipe provided at an upper end of the upper pipe portion. A cylinder divided into two lower chambers by an intermediate wall, a first piston rod vertically penetrating the upper and lower two chambers, and an upper, middle, and lower collar provided at an upper chamber portion of the first piston rod. A first piston and a second piston which are supported between the middle collar and the middle collar and between the middle collar and the lower collar, respectively, so as to be vertically movable; 2 With the piston pressed down, A first coil spring inserted therein, a first port provided on the upper end wall of the cylinder between the same wall and the first piston in a state where air is sent and exhausted, and an intermediate wall between the first wall and the second piston. A second port provided, a lower end of the first piston rod extending through the upper pipe portion to the center of the upper and lower valve seats, and a second tubular piston rod attached to the extension portion so as to be vertically movable; A third piston supported on the upper end of the two-piston rod so as to move up and down in the lower chamber;
A cylindrical hollow chamber provided on the inner peripheral surface of the second piston rod, a spring seat provided at a location existing in the cylindrical hollow chamber in the first piston rod, and a lower surface of the cylindrical hollow chamber and a lower surface of the spring seat; A second coil spring that is weaker than the wound first coil spring, a third port provided on the lower end wall of the cylinder between the wall and the third piston in a state where air is exhausted, and a lower end portion of the second piston rod are provided. An upper valve body seated on the upper valve seat and a lower valve body seated on the lower valve seat provided at the lower end of the first piston rod are provided. It is expensive and can achieve weight reduction, compactness, and simplification of the structure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a double seal valve according to the present invention in a fully closed state.

FIG. 2 is a vertical cross-sectional view similarly showing a fully opened state.

FIG. 3 A recess in which the lower valve body is also provided on the lower surface of the upper valve body.
It is a longitudinal cross-sectional view shown in the state where it was fitted in.

FIG. 4 is a longitudinal sectional view showing the lower valve element in a partially opened state.

FIG. 5 is a longitudinal sectional view showing the upper valve body in a partially opened state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluid inlet conduit 2 Fluid outlet conduit 3 Upper valve seat 4 Lower valve seat 5 Valve case 6 Upper through hole 7 Upper pipe part 8 Lower through hole 9 Lower pipe part 10 Intermediate wall 11 Upper chamber 12 Lower chamber 13 Cylinder 14 first piston rod 15 upper collar 16 middle collar 17 lower collar 18 first piston 19 second piston 20 first coil spring 21 upper end wall 22 first port 24 second port 25 locking portion 26 second piston rod 27 third Piston 28 Cylindrical hollow chamber 29 Spring seat 30 Second coil spring 31 Lower wall 32 Third port 35 Upper valve body 36 Upper cleaning liquid reservoir 37 Upper cleaning liquid listening supply port 38 Cleaning liquid guide hole 40 Cleaning liquid discharge pipe 41 Lower valve body 42 Balance Piston 43 Lower cleaning liquid flow path 44 Lower cleaning liquid supply port 45 Cleaning liquid discharge port 46 Discharge gap 46 47 Cleaning liquid 1st spout 48 Cleaning liquid 2nd spout 49 recess

Claims (1)

(57) [Claims] 1. A valve housing having a fluid inlet conduit and a fluid outlet conduit and having an upper valve seat and a lower valve seat disposed in an up and down arrangement between the fluid inlet conduit and the fluid outlet conduit. A cylinder divided by an intermediate wall into an upper pipe portion provided on the upper surface of the cutting edge of the upper through hole by opening an upper through hole at an upper portion of the valve seat, and two upper and lower chambers provided at the upper end of the upper pipe portion. And
A first piston rod vertically penetrating the lower two chambers, and upper, middle, and lower collars provided at upper chamber locations of the first piston rod, between the upper collar and the middle collar, and between the middle collar and the lower collar. A first piston and a second piston which are supported to be vertically movable, respectively, and a first piston which is inserted between the first and second pistons in a state of pressing the first piston upward and pressing the second piston downward. A coil spring, a first port provided on the upper end wall of the cylinder between the same wall and the first piston, and a second port provided on an intermediate wall between the same wall and the second piston. Port and
A lower end of the first piston rod is extended to the center of the upper and lower valve seats through the upper pipe portion, and is attached to the extension portion so as to be vertically movable. The third that was supported while moving up and down in the side room
A piston, a cylindrical hollow chamber provided on the inner peripheral surface of the second piston rod, a spring seat provided at a location existing in the cylindrical hollow chamber in the first piston rod, and a lower surface wall and a spring seat of the cylindrical hollow chamber. A second coil spring that is weaker than the first coil spring wound between the lower surfaces, a third port provided in a lower end wall of the cylinder between the wall and the third piston in a state of sending and discharging air, and a lower end portion of a second piston rod And a lower valve body seated on the lower valve seat provided at the lower end of the first piston rod. .