JPH09217843A - Two-way valve structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a variation in volume of a diaphragm due to deformation by independently providing an auxiliary pressing member which presses the diagram at a position different from the pressing member in a two-way valve in which the diaphragm is pressed against a valve port by an opening and closing pressing member so as to close it. SOLUTION: A two-way valve comprises a valve body part A and an opening and closing drive part. Also a chamber 33 is formed in the body 21 of the valve body part A, and connecting port parts 24 and 25 are provided on the lower both sides of a body peripheral wall 22. Then the opening in the upper surface of the chamber 23 is closed by a diaphragm 33 which covers a valve port 31 and an annular flow path 32, and an opening and closing pressing member 35 which pushes down the center part of the diaphragm 33 and closes the valve port 31 and an auxiliary pressing member 36 are provided on the upper side of the diaphragm 33. These pressing members 35 and 36 are excited upward by springs 41 and 42. In addition, a part of the diaphragm 33 is deformed by the opening and closing pressing member 35 so as to open and close the valve port and adjust the deformation of the other parts by the auxiliary pressing member 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way valve using a diaphragm, and more particularly to an improvement of a two-way valve in which a diaphragm is pressed against a valve opening by an opening / closing pressing member to close the diaphragm.

[0002]

2. Description of the Related Art FIG. 10 shows an example of a conventional two-way valve of this type. The body 1 of the two-way valve has a chamber 3 surrounded by a circular peripheral wall 2, and cylindrical connection ports 4 and 5 are integrally projected from opposite lower sides of the peripheral wall 2 in opposite directions. One of the openings is used as an import 6, and the other opening is used as an outport 7.

Further, an annular valve seat 9 is provided in the body 1 so as to integrally and continuously project from the bottom 8 and the connection port 4 of the chamber 3, and the inside of the valve seat 9 is imported. 6, the flow path 10 communicating with 6 serves as a valve opening 11 opened at the center of the chamber 3, and the valve seat 9 and the peripheral wall 2 communicate with the out port 7 in a concentric circle with the valve opening 11. It is an annular flow path 12.

The upper opening of the chamber 3 is closed by a diaphragm 13 which is stretched over the upper end of the peripheral wall 2 and covers the valve port 11 and the annular flow passage 12. This diaphragm 13
An opening / closing pressing member 14 that closes the valve opening 11 by pressing down the central portion thereof is provided on the upper side of FIG.

[0005]

However, in such a conventional structure, when the valve port 11 is closed, the opening / closing pressing member 1 is used.
4 only pushes down the central portion of the diaphragm 13 to bend it from a horizontal state to a U-shaped cross section, and when the valve port 11 is opened, the opening / closing pressing member 14 is simply raised straight to automatically return the diaphragm 13 to the horizontal state. Therefore, as shown by the hatching of the lattice in FIG. 11, the volume change of the chamber 3 due to the vertical deformation of the diaphragm 13 causes the volume change of the out port 7 side (secondary side) (the primary side also changes). ), Especially when a filling machine is connected to the outport 7, there is a problem that affects the accuracy of the filling amount.

In order to solve such a problem, an object of the present invention is to eliminate the volume change due to the deformation of the diaphragm for opening and closing the valve opening and to improve the filling accuracy by adjusting the deformation of the diaphragm. Further, it is to prevent dripping on the secondary side after closing the valve port.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a two-way valve in which a diaphragm is pressed against a valve opening by an opening / closing pressing member to be closed, and an auxiliary pressing member for pressing the diaphragm at a position different from the opening / closing pressing member is provided. , So as to be separately operable from the opening / closing pressing member so that the opening / closing pressing member deforms a part of the diaphragm to open / close the valve opening, and at the same time the deformation of the other part can be adjusted by the auxiliary pressing member. 4 in FIGS. 1, 2, 3, and 4.
A basic outline of each of the forms is shown.

In FIG. 1, the valve seat 29 is provided so as to project, and the outport 2 is provided around the valve port 31 communicating with the import 26.
The annular flow passage 32 communicating with 7 is formed in a concentric shape, and the diaphragm 3 is formed so as to cover the valve opening 31 and the annular flow passage 32.
This is the case of a two-way valve in which 3 is stretched. In the figure (A)
Is a state in which the valve opening 31 is closed, and (B) is in an opened state,
In (B), the closed position is also indicated by a broken line. When the valve opening 31 is closed, as shown in (A), the central portion of the diaphragm 33 is pushed down by the opening / closing pressing member 35 and pressed against the valve seat 29, and at the same time, the intermediate portion of the diaphragm 33 is pressed in a cylindrical shape. The member 36 is slightly depressed. When opening the valve opening 31, as shown in (B), the opening / closing pressing member 35 is raised to raise the diaphragm 33.
The central portion of the diaphragm 33 is moved away from the valve seat 29, and the auxiliary pressing member 36 is lowered more than in the case of (A) so that the diaphragm 33
Push down the middle part of. In this way, the diaphragm 33 is closed when the valve port 31 is closed and when it is opened.
Since the volume difference due to the deformation does not occur on the primary side and the secondary side, the filling accuracy is improved when the secondary side is a filling machine.

2 is similar to FIG. 1 in that the opening / closing pressing member 35 and the auxiliary pressing member 36 are the same, but the valve seat 29 is not provided so as to project, and the annular flow passage 32 as in FIG. 1 is omitted. In the case of a valve, (A) shows a state in which the valve opening 31 is closed, (B) shows an opened state, and in (B), the position when closed is also shown by a broken line. Also in this case, the deformation of the diaphragm 33 is adjusted by the opening / closing pressing member 35 and the auxiliary pressing member 36 as in the case of FIG. 1, but when returning from the open state of (B) to the closed state of (A). Since the liquid that excessively flows to the secondary side by the operation of the import 26 side can be returned by the operation of the out port 27 side, it is possible to prevent dripping at the time of filling and improve the filling accuracy.

3, the opening / closing pressing member 35 and the auxiliary pressing member 36 are the same as those in FIG. 1, but the valve seat 29 is the same as in FIG.
This is the case of a two-way valve in which is not provided. In this case, the volume difference due to the deformation of the diaphragm 33 between when the valve opening 31 is opened as in (A) and when it is closed as in (B) is prevented from occurring on the primary side and the secondary side. , (C), the valve opening 31 is closed, and then the opening / closing pressing member 35 is left as it is, and only the auxiliary pressing member 36 is raised to return the intermediate portion of the diaphragm 33 upward. With this configuration, the volume of the secondary side can be increased while maintaining the valve port 31 in the closed state, so that the liquid on the secondary side can be sucked and dripping can be prevented.

In FIG. 4, the opening / closing pressing member 35 and the auxiliary pressing member 36 are arranged in the opposite relationship to the above-described three configurations, that is, the opening / closing pressing member 35 is formed into a cylindrical shape and the auxiliary pressing member 36 is provided inside thereof. And the valve port 31 has an inverted truncated cone shape,
The opening / closing pressing member 35 can push down the intermediate portion of the diaphragm 33 to the valve seat 29, and the auxiliary pressing member 36 can push down the central portion of the diaphragm 33 to the inside of the valve opening 31. In this case, the volume difference due to the deformation of the diaphragm 33 between when the valve opening 31 is opened as in (A) and when it is closed as in (B) is prevented from occurring on the primary side and the secondary side. , (C), after closing the valve opening 31, the opening / closing pressing member 35 is left as it is and only the auxiliary pressing member 36 is raised to return the central portion of the diaphragm 33 upward. By doing so, the volume of the secondary side is expanded as in the case of FIG. 3, so that it is possible to suck the liquid on the secondary side and prevent dripping.

Further, according to the present invention, in order to automatically or manually perform the opening / closing operation of the valve opening, a first thrust applying member which applies an axial thrust to the opening / closing pressing member to press a part of the diaphragm against the valve opening, A second thrust applying member is provided which applies an axial thrust to the auxiliary pressing member to push the other portion of the diaphragm.

A spring for urging the auxiliary pressing member to the side opposite to the valve opening side is provided between the auxiliary pressing member and the seat portion on the outer periphery of the annular flow path, and the auxiliary pressing member and the opening / closing pressing member are provided. By providing a spring for urging the opening / closing pressing member toward the side opposite to the valve opening side, the return mechanism for the opening / closing pressing member and the auxiliary pressing member can be simplified.

The first thrust applying member and the second thrust applying member are pistons each having a piston rod, and these pistons can be slid separately in two piston chambers partitioned by a partition wall in the same cylinder. Should be installed in

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 5 shows a specific example of the form shown in FIG.
This two-way valve is roughly composed of a lower valve body portion A and an upper drive portion B that controls the opening and closing thereof. Similar to the conventional example shown in FIG. 6, a chamber 23 surrounded by a circular peripheral wall 22 is formed in the body 21 of the valve body A, and the chamber 23 is protruded in opposite directions from both lower sides of the peripheral wall 22. The cylindrical connection ports 24 and 25 are provided,
One of the openings is an import 26 and the other opening is an outport 27. Further, in the body 21, an annular valve seat 29 is provided which is integrally and continuously raised from the bottom portion 28 and the connection port portion 24 and which is raised in the central portion of the chamber 23.
In the valve seat 29, the flow path 3 communicating with the import 26 is provided.
0, the upper end thereof becomes a valve opening 31 opening in the center of the chamber 23, and the annular flow path 3 which is concentric with the valve opening 31 and communicates with the out port 27 between the valve seat 29 and the peripheral wall 22.
It is 2.

An upper surface opening of the chamber 23 is closed by a diaphragm 33 that covers the valve port 31 and the annular passage 32. The peripheral edge of the diaphragm 33 is sandwiched and fixed by the peripheral wall 22 and the pressing ring 34 provided thereon.

On the upper side of the diaphragm 33, an auxiliary pressing member 36 is provided in addition to the opening / closing pressing member 35 that presses down the central portion of the diaphragm 33 to close the valve opening 31. The opening / closing pressing member 35 is provided with an enlarged portion 38 having a size equal to the outer diameter of the valve seat 29 at the lower end of a vertical shaft portion 37. The auxiliary pressing member 36 is cap-shaped (or ring-shaped) having a size that encloses the enlarged portion 38 of the opening / closing pressing member 35 with a sufficient margin.
On the upper surface thereof, a ring-shaped convex portion 39 that protrudes upward from the pressing ring 34 is projected, and a through hole 40 that penetrates the shaft portion 37 of the opening / closing pressing member 35 is provided in the center. There is. The opening / closing pressing member 35 and the auxiliary pressing member 36 are respectively formed by the coil-shaped spring 4
They are separately urged upward (in the direction away from the valve port 31) by 1.42. The spring 41 uses the upper surface of the auxiliary pressing member 36 as a seat portion and the shaft portion 37 of the opening / closing pressing member 35.
The upper end is fixed to the spring 42, and the spring 42
The upper end of the auxiliary pressing member 36 is fixed to the ring-shaped convex portion 39 with the upper surface of 4 as a seat portion.

The cylinder 43, which is the body of the drive unit B,
It is vertically fixed on the body 21 of the valve body A so as to hold down the holding ring 34. This cylinder 43
Inside, a hollow (bottomed tubular) partition wall 44 forms an upper first piston chamber 45 (inner space of the partition wall 44) and a cylinder 43.
It is partitioned by the second piston chamber 46 on the lower side by itself. A first piston 47, which is a first thrust applying member for the opening / closing pressing member 35, is vertically slidably fitted in the first piston chamber 45, and an auxiliary pressing force is inserted in the second piston chamber 46. A second thrust applying member for the member 36
A piston 48 is fitted so as to be slidable up and down. The piston rod 49 of the first piston 47 includes the partition wall 44 and the second piston 44.
The piston 48 slidably penetrates, and the second piston 4
8 penetrates through the hollow (cylindrical) piston rod 50, and the tip (lower end) is in contact with the upper end of the shaft portion 37 of the opening / closing pressing member 35. Further, the ring-shaped tip of the piston rod 50 of the second piston 48 is in contact with the upper end of the ring-shaped convex portion 39 of the auxiliary pressing member 36.

The cylinder 43 is provided with a forward movement port 51 for introducing a pressure fluid into the first piston chamber 45 to slide the first piston 47 downward and a backward movement port 52 for sliding the first piston 47 upward. Similarly, the second piston chamber 4
A forward moving port 53 for sliding the second piston 48 downward by introducing a pressure fluid into 6 and a backward moving port 54 for sliding the second piston 48 upward are provided.

In the above structure, when the valve port 31 is closed, the forward movement port 51 is provided in the first piston chamber 45.
5, the first piston 47 is slid downward, and the piston rod 49 pushes the opening / closing pressing member 35 against the spring 41.
The central portion of the diaphragm 33 is pushed down and pressed against the valve seat 29. At the same time, a pressure fluid is introduced into the second piston chamber 46 from the forward movement port 53 to slide the second piston 48 downward, and the piston rod 50 pushes the auxiliary pressing member 36 against the spring 42. While pushing down the ring-shaped intermediate part of the diaphragm 33,
A pressure fluid is also introduced from the return port 54 to balance the pressures on the upper and lower sides of the second piston 48, adjust the descending amount of the second piston 48, and stop the intermediate portion of the ring-shaped intermediate portion of the diaphragm 33. Push down halfway.

When the valve port 31 is opened, pressure fluid is introduced into the first piston chamber 46 from the return port 51 to slide the first piston 47 upward as shown in FIG.
While restoring the central part of the diaphragm 33 upward,
While the pressurized fluid is being introduced into the first piston chamber 46 from both the forward movement port 53 and the backward movement port 54, the second piston 48 is lowered from the intermediate stop position shown in FIG. 3 to move the auxiliary pressing member 36 further downward. It pushes and further pushes down the middle part of the diaphragm 33. As a result, the central portion of the diaphragm 33 rises above the position shown in FIG. 1 and the valve port 31 opens, but the ring-shaped intermediate portion of the diaphragm 33 further lowers. Even if the deformed shape of the diaphragm 33 is different from that in the state of 6,
Therefore, the volume of the chamber 23 does not change.

When adjusting the opening of the valve port 31, the first
After the piston 47 is slid upward or downward to adjust the height of the central portion of the diaphragm 33, at the same time, the second piston 48 is also slid downward or upward to adjust the height of the ring-shaped intermediate portion of the diaphragm 33. As a result, the opening degree of the valve opening 31 can be adjusted without changing the volume.

Next, the modification shown in FIG. 7 is the same as the embodiment shown in FIG.
The configuration is slightly different. That is, in the example of FIG. 7, the first piston 47 and the second piston 48 are urged downward by the springs 55 and 56 respectively arranged on the upper side thereof, and the forward movement ports 51 and 53 in the example of FIG. 5 are omitted. The pressing member 3 for opening and closing by the force of the spring 55
5, the central portion of the diaphragm 33 is pressed against the valve seat 29 so that the valve port 31 is normally closed. In this case, by introducing the pressure fluid from the return ports 52 and 54 and adjusting the pressure, the opening and closing of the valve port 31 and its opening can be controlled without the volume change due to the deformation of the diaphragm 33.

Contrary to the case of FIG. 7, the spring 55
56 is arranged below the pistons 47 and 48, the backward movement ports 52 and 54 are omitted, and the forward movement ports 51.5 and 5 shown in FIG.
If the valve 3 is provided, the valve port 31 can be normally opened. As a thrust applying member for applying a thrust to the opening / closing pressing member 35 and the auxiliary pressing member 36, a screw or the like may be used when manually operated.

FIG. 8 shows a specific example of the form shown in FIG.
The structure shown in FIG. 5 is the same as the structure shown in FIG.
9 is provided without projecting, and the import 26 is provided by projecting the connection port 24 outside the bottom 28. Regarding the action, FIG.
In order to prevent the volume difference between the primary side and the secondary side due to the deformation of the diaphragm 33 between the time when the valve opening 31 is opened as shown in FIG. The sliding with the second piston 48 is adjusted. Further, as shown in FIG. 3C, after closing the valve opening 31, the opening / closing pressing member 35 is left as it is and only the auxiliary pressing member 36 is raised so that the intermediate portion of the diaphragm 33 is returned upward. , The first piston 47 remains in the lowered position, and the second piston 48 is raised.

FIG. 9 shows a concrete example of the form shown in FIG.
The opening and closing pressing member 35 and the auxiliary pressing member 36 are arranged in the opposite relationship to the structure shown in FIG. 8, that is, the opening and closing pressing member 35.
Is formed into a cylindrical shape, and an auxiliary pressing member 36 is arranged inside thereof. The opening / closing pressing member 35 pushes down the intermediate portion of the diaphragm 33 to the valve seat 29.
The central portion of 3 is able to be pushed down to the inside of the valve opening 31, and the connection port portion 24 protruding from the bottom portion 28 of the body 21 is provided with an inverted frustoconical portion to make the valve opening 31 into an inverted frustoconical shape. What you did is different. The actions of the first piston 47 and the second piston 48 in this case are opposite to those in the example of FIG.

[0028]

As described above, according to the present invention, a part of the diaphragm is deformed by the pressing member for opening and closing to open and close the valve opening, and at the same time, the deformation of other parts can be adjusted by the auxiliary pressing member. It is possible to control the opening and closing of the valve opening and the opening thereof without changing the volume due to deformation of the valve. Therefore, when used in a filling machine, the filling accuracy can be improved. It is also possible to prevent dripping on the secondary side after closing the valve port.

[Brief description of drawings]

FIG. 1 shows a basic schematic structure of a first embodiment of the present invention applied to a two-way valve having an annular flow path around a valve opening, and (A).
Shows the state in which the valve port is closed, and (B) shows the state in which it is open.

FIG. 2 shows a basic outline structure of a second embodiment of the present invention applied to a two-way valve having no annular flow passage as shown in FIG.
(A) shows a state where the valve port is closed, and (B) shows a state where it is open.

FIG. 3 shows a basic schematic structure of a third aspect of the present invention,
(A) is a state in which the valve opening is opened, (B) is in a closed state,
(C) is a state in which the intermediate portion of the diaphragm is returned upward while the valve port is closed.

FIG. 4 shows a basic schematic structure of a fourth aspect of the present invention,
(A) is a state in which the valve opening is opened, (B) is in a closed state,
(C) shows a state in which the central portion of the diaphragm is returned upward while the valve port is closed.

5 is a cross-sectional view of the specific example of the form shown in FIG. 1, with the valve port closed.

FIG. 6 is a cross-sectional view of a main part of the above, in an open state.

FIG. 7 is a cross-sectional view of the modified example of FIG. 5, showing a state in which the valve port is closed.

FIG. 8 is a cross-sectional view of the specific example of the form shown in FIG. 3, showing a state in which the valve port is closed.

9 is a cross-sectional view of the specific example of the form shown in FIG. 4, showing a state in which the valve port is closed.

FIG. 10 is a sectional view of a main part of a conventional example, showing a state in which a valve port is opened.

FIG. 11 is a cross-sectional view of an essential part of the above, in an open state.

[Explanation of symbols]

 A valve body part B drive part 23 chamber 26 import 27 outport 29 valve seat 31 valve opening 32 annular flow path 33 diaphragm 35 opening / closing pressing member 36 auxiliary pressing member 41/42 spring 43 cylinder 44 partition wall 45 first piston chamber 46th 2 piston chamber 47 first piston 48 second piston 49/50 piston rod

Claims (7)

[Claims] 1. A two-way valve in which a diaphragm is pressed against a valve opening by an opening / closing pressing member to close the diaphragm, and an auxiliary pressing member for pressing the diaphragm at a position different from the opening / closing pressing member is referred to as an opening / closing pressing member. Is a two-way valve structure characterized by being separated and separately operable. 2. The two-way valve structure according to claim 1, wherein the auxiliary pressing member is concentrically provided around the opening / closing pressing member. 3. The two-way valve structure according to claim 1, wherein the opening / closing pressing member is provided concentrically around the auxiliary pressing member. 4. A first thrust applying member for applying an axial thrust to the opening / closing pressing member to press a part of the diaphragm against the valve opening, and a second thrust applying member for applying an axial thrust to the auxiliary pressing member to press the other part of the diaphragm. The two-way valve structure according to claim 2 or 3, further comprising a thrust applying member. 5. The second thrust applying member is a direction in which a part of the diaphragm expands the volume on the secondary side of the valve opening after the opening / closing pressing member is pressed against the valve opening by the first thrust applying member. The two-way valve structure according to claim 4, wherein the auxiliary pressing member is moved back in a direction opposite to the pressing direction so as to be deformed into. 6. A spring for urging the auxiliary pressing member to the side opposite to the valve opening side is provided between the auxiliary pressing member and the seat portion, and the spring is provided between the auxiliary pressing member and the opening / closing pressing member. The two-way valve structure according to claim 4 or 5, further comprising a spring for urging the opening / closing pressing member toward the side opposite to the valve opening side. 7. The first thrust applying member and the second thrust applying member are pistons each having a piston rod, and these pistons are separately slid on two piston chambers partitioned by a partition wall in the same cylinder. The two-way valve structure according to claim 6, wherein the two-way valve structure is movably provided.