JPH0828721A - Diaphragm valve device - Google Patents

Abstract

PURPOSE:To prevent a diaphragm from biting of powder or the like. CONSTITUTION:A diaphragm 50 has the proximal end 51 projecting to the peripheral edge in the T-shaped sectional form and a tapered part 52 projecting into a transport path 20 from the proximal end 51 and is provided between the diaphragm 50 and body part 30 with a diaphragm holding ring 53 located to span the proximal part 51 of the diaphragm 50 and a part of the tapered part 52 and sandwich the proximal part 51 of the diaphragm 50 and a portion of the tapered part 52 between the body part and the proximal end 51. Also, between the diaphragm 50 and a pusher 60 are provided a spring 67 compressed therebetween and a stopper 62 for regulating the maximum interval angle between the diaphragm 50 and pusher 60 against the stability of the spring 67 and further a cross-like rib perpendicular and parallel to the longitudinal direction of a transport path 20 is provided on the outer peripheral surface of the pusher 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm valve device, and more particularly to improvement of a diaphragm valve device used when powder or tablets are conveyed.

[0002]

2. Description of the Related Art Conventionally, as a diaphragm valve device of this type, a conveying passage having an inlet at one end and an outlet at the other end, and a diaphragm that moves forward and backward in the conveying passage to open and close the conveying passage. Corresponding to the inner peripheral surface of this diaphragm, a compressor that pushes the diaphragm into the transfer passage,
It is known that the compressor is provided with a main body portion having an advancing / retreating means for advancing / retreating toward the conveying passage side.

Further, in the conventional diaphragm valve device, the diaphragm has a base end portion projecting in a T-shaped cross section at the peripheral edge thereof, and a tapered taper portion projecting from the base end portion into the transfer passage. It has been known that a diaphragm holding ring for fixing only the base end of the diaphragm is provided between the diaphragm and the main body. Also,
The diaphragm and the pusher were fixed to each other by a connecting metal fitting interposed therebetween.

[0004]

However, in the pressing ring of the conventional diaphragm valve device, only the base end portion of the diaphragm is fixed. Therefore, when the diaphragm rises, the gap between the base end portion and the taper portion is increased. There is a first problem that it bends in a concave shape and the powder is caught in the concave part, which hinders the diaphragm from descending.

That is, when the pusher rises and the diaphragm valve device is opened, a portion near the base end portion of the diaphragm is deformed toward the main body side to form a concavely deformed concave portion. At that time, since the diaphragm can be freely deformed toward the main body side, the shape of this recess is
It was deformed to the inner side toward the main body side, its radius curvature was also small, and its cross-sectional shape was a blind alley with a narrow inlet.

Then, when the diaphragm valve device is closed, when powder or the like moving in the transfer passage enters the recess, the pusher descends, and the powder entering the recess is compacted and closed. Therefore, it was easy for the powder to be caught inside the recess. This prevents normal movement of the diaphragm, and when the pusher pushes the diaphragm downward, a gap is created between the diaphragm and the conveyance passage, so the conveyance passage cannot be completely blocked and the gap There was a drawback that powder and the like leaked from the.

Further, since the diaphragm and the pusher are fixed to each other by the connecting fitting, the inner peripheral surface of the tapered portion of the diaphragm and the outer peripheral surface of the pusher are in close contact with each other,
There is a second problem that the diaphragm cannot be elastically deformed freely, and stress is concentrated on a specific portion when the diaphragm is deformed, and the diaphragm is easily damaged. That is, in the conventional diaphragm valve device, when the diaphragm is in the open state, the tapered portion of the diaphragm is deformed into a concave shape toward the main body.

At this time, the diaphragm and the pusher are fixed to each other by the connecting metal fittings, and the inner peripheral surface of the taper portion of the diaphragm is in close contact with the outer peripheral surface of the pusher. Deformation is restricted. For this reason, stress concentrates only on a part of the taper portion of the diaphragm, and fatigue fracture due to repeated use and wear due to stress concentration are likely to proceed, and the diaphragm is easily damaged.

Further, since the diaphragm and the pusher were in close contact with each other when descending, the diaphragm could not be freely deformed, powder was easily caught between the transfer passage and the diaphragm, and the transfer passage and the diaphragm were separated from each other. There is a third problem that a gap is likely to occur between them. That is, in the conventional diaphragm valve device, the outer peripheral surface of the pusher is formed so as to correspond to the inner peripheral surface of the diaphragm, and the inner peripheral surface of the diaphragm and the outer peripheral surface of the pusher are completely adhered and fixed. It had been.

Therefore, when a large amount of powder or the like exists near and around the taper portion of the diaphragm when the diaphragm is pushed into the transfer passage, there is no escape place for the powder or the like and the powder or the like is firmly compacted. It As a result, the compacted powder or the like is caught between the pusher and the transfer passage, and a gap is generated between the diaphragm and the transfer passage, and the powder or the like leaks from this gap.

Therefore, the invention according to claim 1 is made in view of the above-mentioned first problem, and the purpose thereof is to place the diaphragm holding ring from the base end portion of the diaphragm toward the taper portion. By extending,
An object of the present invention is to provide a diaphragm valve device that prevents the occurrence of biting of powder or the like in the tapered portion of the diaphragm.

The invention according to claim 2 is made in view of the above-mentioned second problem, and the purpose thereof is to form a space between the diaphragm and the pusher, It is an object of the present invention to provide a diaphragm valve device capable of improving the durability performance of the diaphragm by allowing the diaphragm to freely bend away from the pusher.

The invention set forth in claim 3 is made in view of the above-mentioned third problem, and the purpose thereof is to form a rib at a position orthogonal to the longitudinal direction of the conveying passage. Accordingly, it is an object of the present invention to provide a diaphragm valve device capable of increasing the pressing force per unit area and preventing the powder and the like from being caught between the transfer passage and the diaphragm.

Further, in addition to the above object, the invention according to claim 4 is to provide a diaphragm valve device having a stable diaphragm by forming ribs at positions parallel to the longitudinal direction of the conveying passage. Is.

[0015]

The present invention is to achieve the above-mentioned object, and the contents thereof will be described below with reference to the embodiments shown in the drawings. In the invention according to claim 1, the diaphragm (50) has a base end portion (51) protruding in a T-shaped cross-section at a peripheral edge, and a tapered shape protruding from the base end portion (51) into the transfer passage (20). With the taper part (52) of
Between the (50) and the main body (30), the base end (51) of the diaphragm (50) and a part of the taper part (52) are located, and the base end of the diaphragm (50) is located. A diaphragm holding ring (53) for holding the (51) and a part of the taper portion (52) by sandwiching them between the body portion (30) is featured.

The invention according to claim 2 is a diaphragm (50).
Between the pusher (60) and the pusher (60), a spring (67) compressed between the diaphragm (50) and the pusher (60) and the diaphragm (5) against the compression restoring force of the spring (67).
It is characterized in that it is provided with a stopper (62) for restricting the maximum distance between the pusher (60) and the pusher (60). According to the invention of claim 3, the inner peripheral surface of the diaphragm (50) and the pusher (6
At least one of the outer peripheral surface of (0) is characterized in that at least a pair of ribs (63, 63) are formed along the peripheral surface and at a position orthogonal to the longitudinal direction of the transport passage (20). And

The invention according to claim 4 is the diaphragm (50).
One of the inner peripheral surface of the pusher (60) and the outer peripheral surface of the pusher (60) is along at least one of the peripheral surfaces, and at least a pair of ribs (64.64) are provided at a position parallel to the longitudinal direction of the transport passage (20).
Is formed.

[0018]

According to the first aspect of the invention, when the diaphragm valve device (10) is opened, the pusher (60) causes the main body (3) to move.
The center of the diaphragm (50) that has moved to the (0) side and has protruded into the transfer passage (20) accordingly retracts from the transfer passage (20) side to the main body section (30) side. Since the base end portion (51) of the diaphragm (50) is fixed by the diaphragm holding ring (53), the center of the diaphragm (50) and the diaphragm
Tapered tapered portion located between the base end (51) of (50)
(52) is deformed into a concave shape toward the main body (30) side.

At this time, the diaphragm holding ring (53) is formed not only over the base end portion (51) of the diaphragm (50) but also over a part of the taper portion (52) of the diaphragm (50). ing. Therefore, the diaphragm (50) is blocked by the diaphragm pressing ring (53), and the diaphragm (50) cannot be freely deformed toward the main body (30) side.
It is prevented from entering while being deeply deformed toward the main body part (30) side, and the taper part (52) is deformed in a gentle curve.

As a result, the radius of curvature of the concavely deformed portion of the taper portion (52) is smaller than that when the diaphragm pressing ring (53) is formed only at the base end portion (51). It can be made large, and powder or the like is prevented from entering the inside of the tapered portion (52) deformed into a concave shape.
Therefore, when closing the diaphragm valve device (10), even if the pusher (60) descends, the density of the powder that has entered the concave taper portion (52) increases, and the state is closed. It can be prevented that the powder and the like are caught therein.

As a result, the diaphragm (50) can be smoothly projected into the transfer passage (20),
Normal movement of (50) is secured. Therefore, there is no gap between the diaphragm (50) and the transfer passage (20) due to the biting of powder or the like, and it is possible to prevent the powder or the like from leaking. Transport passage
(20) can be completely cut off.

According to the second aspect of the invention, the diaphragm (50) is provided between the diaphragm (50) and the pusher (60).
And a spring (67) compressed between the pusher (60) and the pusher (60). For this reason, the spring (67)
Energize between (50) and pusher (60) in a direction to pull them apart.

This allows the diaphragm (50) and the pusher (60) to be separated from each other. The diaphragm valve device (10) is provided with a stopper (62) that restricts the maximum distance between the diaphragm (50) and the pusher (60) against the compression restoring force of the spring (67). ing.

Therefore, the stopper (62) resists the compressive restoring force of the spring (67) and keeps the distance between the diaphragm (50) and the pusher (60) below a predetermined length. As a result, a space is formed between the diaphragm (50) and the pusher (60), and the space can be set to a predetermined size. Therefore, in the open state,
This predetermined amount of space is always formed, and the diaphragm (50) can be freely deformed in a concave shape toward the main body (30).

That is, when the diaphragm (50) descends, the diaphragm (50) protrudes into the transfer passage (20) from the state of being deformed into a concave shape, but the diaphragm (50) and the pusher (50) are pushed by the urging force of the spring (67). A space is formed between it and 60). Therefore, the movement of the diaphragm (50) is
It is freely deformed and moved without being restricted by 0).

As a result, the movement of the diaphragm (50) at a specific position is restrained and stress is not concentrated, and the durability of the diaphragm (50) can be improved. Furthermore, even if a large amount of powder or the like is present in the vicinity of the lower portion of the diaphragm (50), since the diaphragm (50) is elastically deformed in the space, the powder or the like easily flows and the diaphragm (50) and Strong biting does not occur between the transfer passageway (20).

As a result, the diaphragm (50) and the transfer passage
It is possible to prevent the generation of a gap due to biting with (20) and prevent leakage of powder or the like from the gap. Furthermore, when the diaphragm (50) rises, the diaphragm holding ring (53)
It is formed so as to straddle the base end portion (51) and a part of the taper portion (52).

Therefore, the diaphragm pressing ring (5
3) Hold down part of the taper part (52) of the diaphragm (50). Therefore, the tapered portion (52) of the diaphragm (50) is partially restricted from being deformed toward the main body portion (30) by the diaphragm pressing ring (53). However, the urging force of the spring (67) creates a space between the diaphragm (50) and the pusher (60), so that the diaphragm (5
The remaining part of (0) whose deformation is not restricted can be freely deformed.

As a result, stress does not concentrate on a specific portion of the taper portion (52) of the diaphragm (50), and the durability of the diaphragm (50) can be improved. According to the third aspect of the invention, at least one of the ribs (63, 63) is provided on one of the inner peripheral surface of the diaphragm (50) and the outer peripheral surface of the pusher (60), and the transfer passage (20). Is formed at a position orthogonal to the longitudinal direction of the.

Therefore, the pressing force of the pusher (60) concentrates on the ribs (63, 63), and the pressing force per unit area increases. As a result, the transfer passage (2
The blocking of 0) can be made stronger. In addition, ribs
Except where (63, 63) are formed, the diaphragm (50) and pusher (60) are as thick as the ribs (63, 63).
A space is formed between and.

For this reason, the diaphragm (50) is
When the powder (50) is pushed between the diaphragm (50) and the transfer passage (20) when pressed by the (60) into the transfer passage (20), the diaphragm (50) is only the space. , Elastically deforms. As a result, powder or the like is firmly caught between the diaphragm (50) and the transfer passage (20), and a gap is generated between the diaphragm (50) and the transfer passage (20). It is possible to prevent the occurrence of leakage of powder and the like.

According to the fourth aspect of the present invention, at least a pair of ribs (64, 64) are provided on either one of the inner peripheral surface of the diaphragm (50) and the outer peripheral surface of the pusher (60).
It is formed at a position parallel to the longitudinal direction of (20). That is, the ribs (63, 63, 64, 64) are arranged in a cross shape at positions parallel and orthogonal to the longitudinal direction of the transport passageway (20).

Therefore, this cross-shaped rib (63, 63, 64, 6
4) serves as a framework of the diaphragm (50) and can stably maintain the conical shape. In addition, ribs (64,64)
Are formed parallel to the longitudinal direction of the transfer passage (20), so that when the powder or the like moves inside the transfer passage (20), the powder or the like moves along the ribs (64, 64). It will be easier.

Therefore, the powder or the like does not form a turbulent flow, a stable steady flow can be formed, and the resistance of the fluid such as the powder or the like in the diaphragm valve device (10) can be reduced. .

[0035]

1 to 7 show an embodiment of the present invention. FIG. 1 is a sectional view of a diaphragm valve device in a closed state, and FIG.
Is a cross-sectional view of the diaphragm pressing ring, FIG. 3 is an enlarged cross-sectional view of the diaphragm valve device in a closed state, and FIG. 4 is an enlarged cross-sectional view of a state in which a gap is generated between the diaphragm and the pusher in the closed state of the diaphragm valve device. 5 is an enlarged sectional view of the diaphragm valve device in an open state, FIG. 6 is a bottom view of the pusher, and FIG. 7 is a sectional view taken along the line AA of FIG.

In FIG. 1, 10 indicates a diaphragm valve device,
The diaphragm valve device 10 is provided with a transfer passage 20 through which powder and the like are transferred, and a cylindrical main body portion 30 extending upward from the center of the transfer passage 20 and connected in series.
As shown in FIG. 1, the transfer passage has a cylindrical shape and has an inlet 21 at one end and an outlet 22 at the other end.

As shown in FIG. 1, the main body portion 30 has a hollow cylindrical housing 40 which is continuously provided upward from the center of the transfer passage 20. Inside the housing 40, as shown in FIG.
The diaphragm 50 that opens and closes, the pusher 60 that pushes the diaphragm 50 into the transport passage 20, and the pusher 60
It has an advancing / retreating means 70 for advancing / retreating the 60 toward the transport passage 20 side.

More specifically, as shown in FIG. 1, the housing 40 has a cylindrical housing side wall 41 and a housing cover 42 covering the upper portion of the housing side wall 41.
And a port cover 43 formed at the upper center of the housing cover 42. The housing side wall 41
Are arranged on the transport passage 20 with the central axis thereof being vertical, as shown in FIG.

As shown in FIG. 1, the housing cover 42 is disk-shaped and has a central hole 44 at the center. In addition, as shown in FIG. 1, an operation port 45 is formed in the vicinity of the center of the housing cover 44, the operation port 45 being opened in a substantially columnar shape and injecting air from the outside. As shown in FIG. 1, the port cover 43 has a disk shape, and has a hollow hole 46 communicating with the central hole 44 of the housing cover 42 and a cylindrical shape laterally from the hollow hole 46. The adjustment port 47 is opened. Further, the port cover 43 is made of a transparent material, and is formed so that the inside of the hollow hole 46 can be seen from the outside.

The diaphragm 50 is made of an elastic material such as rubber. As shown in FIG. 1, the diaphragm 50 has a substantially conical shape and is located at the upper center of the transfer passage 20. Located in between. Further, as shown in FIG. 1, the diaphragm 50 has a base end portion 51 projecting in a T-shaped cross-section on the periphery and a tapered taper portion 52 projecting from the base end portion 51 into the transport passage 20. Have

Further, between the diaphragm 50 and the housing 40, as shown in FIG. 1, the outer shape is a ring shape, and it extends over the base end portion 51 of the diaphragm 50 and a part of the taper portion 52. And a diaphragm pressing ring 53 that holds the base end portion 51 of the diaphragm 50 and a part of the tapered portion 52 by sandwiching them between the housing 40 of the main body portion 30.

As shown in FIG. 2, on the lower surface of the diaphragm pressing ring 53 on the center side, a tapered surface 53a is formed which is inclined downward toward the center. This tapered surface 53a is the upper part of the transport passage 20, and the tapered surface 5a
Since it is positioned parallel to the surface facing 3a, the surface of the diaphragm 50 is in close contact with the upper portion of the transfer passage 20 and powder or the like can be prevented from being caught between them.

Further, the diaphragm pressing ring 53
A chamfered and rounded corner portion 53b is formed between the inner peripheral surface of the and the tapered surface 53a. The corner portion 53b prevents the surface of the diaphragm 50 from being damaged. As shown in FIG. 1, a cylindrical connecting fitting 54 and a cylindrical coupling 55 fixed to the connecting fitting 54 are provided in the upper center part of the diaphragm 50.

At the lower end of the connecting fitting 54, as shown in FIG. 1, there are two nodes 56, 56, and these nodes 56, 56 are embedded in the diaphragm 50. As a result, the connecting fitting 54 is fixed to the diaphragm 50. Further, as shown in FIG. 1, the upper end of the connecting fitting 54 projects upward from the pusher (60), and its outer peripheral surface is threaded.

As shown in FIG. 1, the coupling 55 has an external shape in which two cylinders having different diameters are combined, and is formed as a hollow cylinder. That is,
As shown in FIGS. 1 and 3 to 5, the coupling 55 has a large-diameter portion 57 that is located above and has a large diameter, and a small-diameter portion 58 that is located below and has a small diameter. Between the portion 57 and the small diameter portion 58, there is a step portion 59 which is continuously provided between the lower end of the large diameter portion 57 and the upper end of the small diameter portion 58 and forms a step.

As shown in FIG. 1, the small diameter portion 58 has its inner surface threaded so that it can be screwed into the upper end of the connecting fitting 54. Then, the coupling 55 is screwed into the upper end of the connecting fitting 54, and is firmly connected to the central upper end of the diaphragm 50 via the connecting fitting 54. As shown in FIGS. 1, 6 and 7, the pusher 60 has a diaphragm 50 on its outer peripheral surface.
The outer peripheral surface is formed in a conical shape corresponding to the inner peripheral surface of the tapered portion 52 of the diaphragm 50.

At the lower center of the pusher 60, as shown in FIG. 1, a hollow portion 61 opened downward in a cylindrical shape.
It is located in the middle of this hollow portion 61 in the height direction, its outer shape is a ring shape, and half of its width is the pusher 60.
The other half has a stopper 62 projecting from the inner peripheral surface of the hollow portion 61 to the inside of the hollow portion 61.

The pusher 60 is shown in FIGS.
As shown in FIG. 5, on the outer peripheral surface inclined in the lower conical shape, a pair of ribs 63, 63 formed at positions orthogonal to the longitudinal direction of the transport passage 20, and similarly parallel to the longitudinal direction of the transport passage 20. A pair of ribs 64, 64 formed in a position, a screw hole 65 which is perpendicular to the upper surface and whose inner surface is threaded, and pusher pressing rings 66, 66 arranged at the upper peripheral edge thereof. There is.

The inner diameter of the hollow portion 61 is set larger than that of the large diameter portion 57 of the coupling 55, as shown in FIG. The inner diameter of the stopper 62 is set smaller than that of the large diameter portion 57 of the coupling 55, as shown in FIG. Between the coupling 55 and the pusher 60, as shown in FIG. 1, is located inside the large diameter portion 57 of the coupling 55,
A spring 67 that applies a biasing force is arranged between the pusher 60 and the step portion 59 of the coupling 55.

As shown in FIG. 1, the advancing / retreating means 70 is a cylinder device 80 for retracting the diaphragm 50 from the inside of the transfer passage 20 and a cylinder device 80 for returning the cylinder device 80 into the transfer passage 20. It is equipped with a coil spring 100. More specifically, as shown in FIG. 1, the cylinder device 80 includes a cylinder 81 vertically arranged inside the housing 40, a piston 82 that reciprocates inside the cylinder 81, and one end of the piston 82. And a piston rod 83 whose other end is connected to the pusher 60.

More specifically, as shown in FIG. 1, the cylinder 81 includes a cylinder side wall 84 formed in a cylindrical shape with its central axis vertical and a lower part of the inner circumference of the cylinder side wall 84. It has a cylinder bottom wall 85 formed in a plate shape, has a bottomed cylindrical shape that opens upward, and has a vertical cross section formed in an H shape. As shown in FIG. 1, the cylinder side wall 84 has its upper portion abutted against the lower inner surface of the housing cover 42 so that the inside of the cylinder 81 communicates with the central hole 44 of the housing cover 42 and the hollow hole of the port cover 43.
It is formed so as to communicate with the adjustment port 47 via 46.

As shown in FIG. 1, the cylinder side wall 84 extends vertically downward from the position corresponding to the operation port 45 of the housing cover 42 inside the side surface of the cylinder 81.
A communication pipe 86 that communicates with the lower inside of the cylinder 81 is formed. As shown in FIG. 1, the cylinder bottom wall 84 has a piston rod hole 87 formed in the center thereof with its central axis perpendicular, and a piston rod 83 is passed through the piston rod hole 87. Further, as shown in FIG. 1, a cylinder groove 88 is formed on the inner peripheral surface of the piston rod hole 87 of the cylinder bottom wall 76.
An O-ring 89 for cylinder is inserted inside 88.

As shown in FIG. 1, the piston 82 has a disk shape, and is arranged horizontally inside the cylinder 81, that is, with its central axis vertical, and has a piston rod 83 at its center. The upper part of is fixed by bolts 90. Further, a piston groove 91 is formed on the outer circumference thereof, and a piston O-ring 92 is inserted inside the piston groove 91 as shown in FIG.

As shown in FIG. 1, the piston rod 83 is arranged in the center of the cylinder 81 with its central axis being vertical. Further, as described above, the piston 82 is fixed to the upper portion by the bolt 90, and the lower end thereof is screwed and fixed in the screw hole 65 in the upper portion of the pusher 60. That is, as the piston 82 moves up and down inside the cylinder 81, the pusher 60 is set to be able to move up and down in conjunction with each other.

At the upper end of the piston rod 83, a cylindrical marker 93 which is made of thermoplastic resin or the like and is colored yellow or the like and has excellent visibility is screwed into the piston rod 83.
It is attached to the upper end of 83. Next, the operation of the diaphragm valve device 10 will be described. First, the operation when the diaphragm valve device 10 shifts from the closed state to the open state will be described.

First, in the closed state where the diaphragm 50 closes the transfer passage 20, air is injected into the operation port 45 from an external air supply source. The air injected from the operation port 45 is injected into the lower portion of the cylinder 81 via the communication pipe 86 of the cylinder side wall 84, and the air pressure is increased. Then, the air pressure on the lower side of the piston 82 in the cylinder 81 becomes higher than the air pressure on the upper side of the piston 82, and the piston 82 is pushed upward by the balance of the forces.

As a result, the piston rod 83 connected to the piston 82 also moves upward. At this time, cylinder 81
The air above the inner piston 82 passes through the central hole 44 of the housing cover 42, the hollow hole 46 of the port cover 43, and is discharged to the outside from the adjustment port 47. The pusher 60 connected to the lower end of the piston rod 83 also moves upward as the piston rod 83 moves.

Further, when the pusher 60 moves upward, the spring 67, which is compressed between the pusher 60 and the large diameter portion 57 of the coupling 55 inside the hollow portion 61, extends in the height direction, and both are pushed. Energize in the direction to pull it apart. As a result, as shown in FIG. 4, the diaphragm 50 and the pusher are
It can be separated from 60.

Further, in the middle of the hollow portion 61 in the height direction,
Since the stopper 62 having a diameter smaller than the large diameter portion 57 of the coupling 55 is arranged, the inner peripheral edge of the stopper 62 is increased as the pusher 60 is raised, as shown in FIG.
It is caught on the lower end of the outer periphery of the large diameter portion 57. That is, the stopper 62 resists the compression restoring force of the spring 67 and regulates the maximum distance between the diaphragm 50 and the pusher 60 to a predetermined length.

As a result, the diaphragm 50 and the pusher
A space can be formed between the space and 60, and the amount of the space can be set to a predetermined size. Then, as the pusher 60 is lifted by the cylinder device 80, the pusher 60 and the diaphragm 50 both rise while maintaining the maximum separation distance. Therefore, the center of the diaphragm 50 protruding into the transfer passage 20 gradually retracts from the transfer passage 20 side to the main body 30 side.

At this time, since the base end portion 51 of the diaphragm 50 is fixed by the diaphragm pressing ring 53, the tapered taper portion 52 located between the center of the diaphragm 50 and the base end portion 51 of the diaphragm 50 is formed. , Is deformed into a concave shape toward the main body 30 side. Further, as shown in FIG. 2, the diaphragm pressing ring 53 has a base end portion 51 of the diaphragm 50.
Not only that, it is formed so as to straddle a part of the tapered portion 52 of the diaphragm 50.

For this reason, the diaphragm 50 is blocked by the diaphragm pressing ring 53, and the diaphragm 50 cannot freely deform toward the main body portion 30 side, but can enter while being deeply deformed toward the main body portion 30 side. When blocked, the tapered portion 52 deforms in a gentle curve. As a result, the radius of curvature of the concavely deformed portion of the tapered portion 52 can be made larger than that in the case where the diaphragm pressing ring 53 is formed only at the base end portion 51 and is deformed into the concave shape. It is possible to prevent powder or the like from entering the inside of the tapered portion 52.

Therefore, it is possible to prevent the density of the powder that has entered the concave tapered portion of the diaphragm 50 from increasing and to prevent the powder from being blocked, and the powder or the like is trapped therein. Can be prevented. Thereby, the smooth movement of the diaphragm 50 is ensured, and the open state as shown in FIG. 5 can be obtained.

The outer peripheral surface of the pusher 60 is shown in FIG.
As shown in FIG. 7, the ribs 63, 63 and the ribs 64, 64 make the conveying passage 20
Are formed in a cross shape at positions parallel and orthogonal to the longitudinal direction of the. Therefore, as shown in FIG. 5, powder and the like collide with the diaphragm 50 in the open state, and pressure is applied to the diaphragm 50, but the cross-shaped ribs 63, 63, 64, 64 become the framework of the diaphragm 50. Thus, the conical shape can be stably maintained.

Further, the ribs 64, 64 arranged in parallel with the transfer passage 20 facilitate movement of the powder or the like along the ribs 64, 64 when the powder or the like moves in the transfer passage 20. The powder or the like can form a stable steady flow without forming a turbulent flow, and the resistance of the fluid such as the powder or the like in the diaphragm valve device 10 can be reduced. The tip of the piston rod 83 has a marker 93 that is colored and has excellent visibility.
And the port cover 43 is made of a transparent material.

For this reason, the piston rod 83 is
When the marker 93 is located at the upper end of 81 and enters the inside of the hollow hole 46 of the port cover 43, the marker 93 can be confirmed from the outside. As a result, the operation of the piston rod 83 can be directly checked with eyes, and the occurrence of a defect or the like can be found early.

Next, the operation of the diaphragm valve device 10 when shifting from the open state to the closed state will be described. First, as shown in FIG. 5, when the diaphragm 50 is raised and the transfer passage 20 is opened, no air is injected from the operation port 45 and no air pressure is applied. Therefore, only the biasing force of the coil spring 100 is
In addition, as shown in FIG. 1, the coil spring 100 is pushed through the pusher pressing rings 66, 66 to pusher 60.
Push down.

At that time, in the hollow portion 61 of the pusher 60, the spring 60 urges the pusher 60 and the coupling 55 in the direction of separating them from each other. As a result, the spring 60 pushes the diaphragm 50 downward from the pusher 60 via the coupling 55 and the coupling fitting 54, and the two are separated. However, since the stopper 62 projects into the hollow portion 61 midway in the height direction of the hollow portion 61, the outer peripheral lower end of the large diameter portion 57 of the coupling 55 is
It is caught on the inner peripheral edge of the stopper 62.

As a result, the pusher 60 and the diaphragm are
The separation distance between 50 and 50 is kept constant and pusher 60
A space of a predetermined size can be formed between the diaphragm 50 and the diaphragm 50. Then, when the pusher 60 is pushed downward by the cylinder device 80, the pusher 60 and the diaphragm 50 are kept at the maximum distance,
The diaphragm 50 is also pushed downwards until the tip of the diaphragm 50 contacts the inner peripheral side surface of the conveyor passage 20.
Project inside 20.

At this time, as described above, the diaphragm pressing ring 53 is formed not only at the base end portion 51 of the diaphragm 50 but also at a position extending over a part of the tapered portion 52 of the diaphragm 50. Therefore, the diaphragm 50 is blocked by the diaphragm pressing ring 53, the diaphragm 50 is not freely deformed toward the main body side, and the tapered portion 52 is deformed in a gentle curve.

As a result, the radius of curvature of the concavely deformed portion of the tapered portion 52 is determined by the diaphragm pressing ring.
It is possible to make it larger than when 53 is formed only at the base end portion 51, and the tapered portion deformed into a concave shape
It is prevented that powder or the like enters the inside of 52. Therefore, even if the pusher 60 descends, it is possible to prevent the powder or the like that has entered the inside of the concave tapered portion 52 from being compressed to increase the density and become a closed state.

As a result, the state in which the powder or the like is caught is prevented, the diaphragm 50 can smoothly project into the transfer passage 20, and the diaphragm 50 can be properly moved. Therefore, there is no gap between the diaphragm 50 and the transfer passage 20 due to the biting of the powder or the like, and it is possible to prevent the powder or the like from leaking through the gap.

Further, when the diaphragm 50 descends, as shown in FIG. 5, the diaphragm 50 projects into the transfer passage 20 from the state of being deformed into a concave shape, but due to the urging force of the spring 67,
A space is formed between the diaphragm 50 and the pusher 60. Therefore, the movement of the diaphragm 50
It is freely deformed and moved without being restricted by 60.

As a result, the movement of a specific portion of the diaphragm 50 is restrained, stress is not concentrated, wear and fatigue damage do not proceed, and the durability of the diaphragm 50 can be improved. Further, even if a large amount of powder or the like exists near the lower portion of the diaphragm 50, the powder or the like easily flows because the diaphragm 50 elastically deforms in the space, and the powder or the like flows between the diaphragm 50 and the transfer passage 20. Therefore, firm biting does not occur.

As a result, it is possible to prevent the generation of the gap due to the bite, and to prevent the powder or the like from leaking from the gap. Further, as shown in FIGS. 6 and 7, on the outer peripheral surface of the pusher 60, a pair of ribs 63, 63 are provided.
It is formed at a position orthogonal to the longitudinal direction of 0. Therefore, the pressing force of the pusher 60 is concentrated on the ribs 63, 63,
The pressing force per unit area is increased, and the blocking of the transfer passage 20 by the diaphragm 50 can be made stronger.

In addition, a transport passage is provided around the diaphragm 50.
Ribs 63, 63 orthogonal to 20 and rib 6 parallel to the transport passage 20
4,64 are formed in a cross shape. Therefore, the cross-shaped ribs 63, 63, 64, 64 become the framework of the diaphragm 50,
The shape of the cone can be stably maintained, and
In the other portions, a space is formed between the diaphragm 50 and the pusher 60 by the thickness of the ribs 63, 63, 64, 64.

Therefore, the diaphragm 50 is pushed by the pusher 60.
When the powder is pushed into the inner peripheral surface of the transfer passage 20 by being pushed by, even if powder or the like enters between the diaphragm 50 and the transfer passage 20, the diaphragm 50 is elastically deformed by the space. As a result, powder and the like are firmly caught between the diaphragm 50 and the transfer passage 20, and the diaphragm
It is possible to prevent the occurrence of a gap between 50 and the transfer passage 20, and to prevent the occurrence of leakage of powder or the like.

Therefore, the diaphragm valve device 10 according to this embodiment can completely shut off the transfer passage 20 by the diaphragm 50 in the closed state. When the opening / closing operation is repeated in the conventional diaphragm valve device, the guaranteed durability is about 10,000 times. However, in the diaphragm valve device 10 according to the present embodiment, the diaphragm 50 is not used.
Since the durability performance can be improved, the number of guaranteed durability times can be improved to about 12,000 times.

Further, by forming the ribs 63, 63 on the pusher 60, the pressing force per unit area can be increased and can be surely shut off. Therefore, in the assembly work, the mounting position of the diaphragm 50 and the pusher 60 can be changed. It is possible to eliminate the need for fine adjustment work and shorten the work process.

[0080]

Since the present invention is constituted as described above, it has the following effects. Claim 1
According to the invention described above, by providing the diaphragm pressing ring extending over the base end portion and the taper portion of the diaphragm, it is possible to prevent the occurrence of the trapping of powder or the like in the taper portion of the diaphragm. A diaphragm valve device can be provided.

According to the second aspect of the present invention, in addition to the above effects, a diaphragm valve device is provided which can improve the durability of the diaphragm by forming a gap between the diaphragm and the pusher. You can . According to the invention described in claim 3, in addition to the above effects, a diaphragm valve capable of increasing the pressing force per unit area and preventing the powder or the like from being caught between the transfer passage and the diaphragm. A device can be provided. .

According to the invention described in claim 4, in addition to the above effects, it is possible to provide a diaphragm valve device capable of forming a stable diaphragm. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a closed state of a diaphragm valve device.

FIG. 2 is a sectional view showing a diaphragm holding ring.

FIG. 3 is an enlarged cross-sectional view showing a closed state of the diaphragm valve device.

FIG. 4 is an enlarged cross-sectional view showing a state in which a gap is generated between the diaphragm and the pusher in the closed state of the diaphragm valve device.

FIG. 5 is an enlarged cross-sectional view showing an open state of the diaphragm valve device.

FIG. 6 is a bottom view showing the pusher.

7 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

10 Diaphragm valve device 20 Conveying passage 21 Inlet 22 Outlet 30 Main body 40 Housing 41 Housing side wall 42 Housing cover 43 Port cover 44 Central hole 45 Operation port 46 Hollow hole 47 Adjustment port 50 Diaphragm 51 Base end 52 Taper Part 53 Diaphragm pressing ring 53a Tapered surface 53b Corner part 54 Coupling metal fitting 55 Coupling 56 Section 57 Large diameter part 58 Small diameter part 59 Step 60 Pusher 61 Hollow part 62 Stopper 63 Rib 64 Rib 65 Screw hole 66 Pusher pressing ring 67 Spring 70 Advancing / retreating means 80 Cylinder device 81 Cylinder 82 Piston 83 Piston rod 84 Cylinder side wall 85 Cylinder side wall 85 Cylinder bottom wall 86 Connecting pipe 87 Piston rod hole 88 Cylinder groove 89 Cylinder O-ring 90 Bolt 91 Piston groove 92 Piston O-ring 93 Marker 100 coil spring

Claims (4)

[Claims] 1. A transfer passage having an inlet at one end and an outlet at the other end, a diaphragm that moves forward and backward in the transfer passage to open and close the transfer passage, and a diaphragm corresponding to an inner peripheral surface of the diaphragm. In a diaphragm valve device comprising: a pusher for pushing the pusher into the conveyance passage; and a main body having an advancing / retreating means for advancing / retreating the pusher toward the conveyance passage side, the diaphragm has a base end projecting in a T-shaped cross-section at its peripheral edge. And a tapered taper portion projecting from the base end portion into the transport passage, and between the diaphragm and the main body portion, the base end portion of the diaphragm and a part of the taper portion are provided. A diaphragm valve device, which is provided with a diaphragm pressing ring for sandwiching and holding a base end portion of a diaphragm and a part of a taper portion between the diaphragm portion and the main body portion. 2. A spring, which is compressed between the diaphragm and the pusher, and a maximum distance between the diaphragm and the pusher, which resists the compression restoring force of the spring. The diaphragm valve device according to claim 1, further comprising a stopper for regulating the diaphragm valve device. 3. A transfer passage having an inlet at one end and an outlet at the other end, a diaphragm that moves back and forth in the transfer passage to open and close the transfer passage, and a diaphragm corresponding to an inner peripheral surface of the diaphragm. In the diaphragm valve device having a pusher for pushing the pusher into the transfer passage and a main body having an advancing and retracting means for moving the pusher forward and backward toward the transfer passage, one of an inner peripheral surface of the diaphragm and an outer peripheral surface of the pusher is provided. The diaphragm valve device is characterized in that at least a pair of ribs are formed at a position orthogonal to the longitudinal direction of the transport passage along any of the peripheral surfaces. 4. At least one pair of ribs are formed on either one of the inner peripheral surface of the diaphragm and the outer peripheral surface of the pusher along the peripheral surface and at a position parallel to the longitudinal direction of the conveying passage. The diaphragm valve device according to claim 3, wherein