JP4841300B2 - Diaphragm valve - Google Patents

Description

  The present invention relates to a diaphragm valve, and more particularly to an apparatus characterized by technical means for preventing the inclination of the diaphragm valve.

Conventionally, (a) the annular valve seat and (b) the outer peripheral end portion is displaced in the axial direction while being held by the valve body, and the distance from the valve seat is changed to change the opening of the flow path. A diaphragm valve; (c) formed on the outer peripheral side of the valve seat and allowing water from the inlet pipe to flow in through the inlet; and (d) on the inner peripheral side of the valve seat. A diaphragm valve having a formed outlet passage on the secondary side of the diaphragm valve is known.
For example, this type of diaphragm valve is disclosed in Patent Document 1 below.

FIG. 15 shows a specific example of this type of diaphragm valve.
In the figure, reference numeral 200 denotes an annular valve seat, 204 denotes a diaphragm valve, 206 denotes an inlet chamber on the primary side of the diaphragm valve 204 formed on the outer peripheral side of the valve seat 200, and 210 denotes a secondary side of the diaphragm valve 204. It is a formed outflow channel.
Here, the valve seat 200 is configured at the tip end portion of the inner cylinder portion 208, and the outflow passage 210 is formed inside the inner cylinder portion 208.

The diaphragm valve 204 has a rubber diaphragm film 212, and its outer peripheral end is held in a fixed state by the valve body 202. In this state, the diaphragm valve 204 is displaced in the axial direction to change the opening of the flow path.
The inflow chamber 206 is provided with an inflow port 214 through which water from the inflow conduit is introduced at a predetermined position in the circumferential direction.
Here, the inflow port 214 is provided sideways. Specifically, it is in the horizontal direction perpendicular to the axial center of the diaphragm valve 204 which is vertically oriented in the figure.

In this diaphragm valve, when the diaphragm valve 204 is seated on the valve seat 200, the flow path is closed and water does not flow.
On the other hand, when the diaphragm valve 204 is separated from the valve seat 200, the flow path is opened, water flows and water from the inflow conduit flows into the inflow chamber 206, and then passes over the valve seat 200 to the outflow path 210. And flows further downstream.
Further, the opening degree of the flow path changes in accordance with the amount of displacement of the diaphragm valve 204 in the axial direction, and the flow rate is increased or decreased in accordance with the change in the opening degree. That is, the flow rate is adjusted.

By the way, in this diaphragm valve, the flow of water flowing into the inflow chamber 206 from the inflow port 214 is biased, so that the water flow does not act evenly over the entire circumference of the diaphragm valve 204, and the diaphragm valve 204 tilts. Therefore, there is a problem that the water discharge operation by the diaphragm valve 204 is not performed smoothly or the flow rate is not adjusted smoothly.
In this case, the flow acting on the diaphragm valve 204, that is, the force acting on the diaphragm valve 204 can be equalized to some extent by taking a certain distance between the inlet 214 and the valve seat 200, that is, the diaphragm valve 204. In this case, the diaphragm valve inevitably becomes long in the vertical direction in the figure, which causes a problem that the diaphragm valve becomes large.

The present invention has been devised to solve the above problems.
The following Patent Document 2 and Patent Document 3 disclose the problem that the generation of turbulent flow or the like in the diaphragm valve is a problem to be solved, but these have a helical communication channel that connects the inflow chamber and the outflow channel. The present invention is intended to solve the problem by forming the flow path or by decentering the inlet and generating a swirling flow, which is different from the present invention.

JP-A-4-302790 JP 2002-310316 A JP 2005-1114090 A

  The present invention is based on the circumstances as described above, and can effectively prevent the diaphragm valve from tilting without particularly increasing the size of the apparatus, and smoothly perform the water discharge operation or the flow rate adjusting operation by the diaphragm valve. An object of the present invention is to provide a diaphragm valve that can be used.

Thus, the present invention comprises (a) an annular valve seat, (b) a diaphragm valve that is displaced in the axial direction with its outer peripheral end held by a valve body, and (c) the valve seat. An inlet chamber on the primary side of the diaphragm valve that allows water from the inlet pipe to flow in through the inlet, and (d) the diaphragm valve formed on the inner peripheral side of the valve seat. of the outflow path of the secondary side, Ri formed comprise, together with the inflow chamber is provided in a form extending in a circumferential direction of the valve seat, the inlet is partially the flow entry in the circumferential direction In addition, it is provided in such a direction that the water from the inflow conduit flows into the inflow chamber in a direction different from the axial direction of the diaphragm valve, and the water that has flowed in from the inflow port is directed to the diaphragm valve in the inflow chamber. in diaphragm valves for converting the flow direction in the direction, the Daiyafura In the axial direction of the valve provided between the inlet and the diaphragm valve, possess a plurality of guide plates which extend in the axial direction of the diaphragm valve, and a plurality of rectifying passage formed in their guide plates A rectifying unit is provided in the inflow chamber for adjusting the flow of water flowing in from the inflow port to flow in the axial direction of the diaphragm valve and acting on the diaphragm valve .

  According to a second aspect of the present invention, in the first aspect, the plurality of guide plates in the rectifying unit are radially oriented in the radial direction.

  According to a third aspect of the present invention, in any one of the first and second aspects, the valve seat is configured by a tip end portion of the inner cylinder portion, and the rectifying portion connects the inner cylinder portion and the valve body. It is characterized by being formed integrally with the inner cylinder part and the valve body.

  According to a fourth aspect of the present invention, in the second aspect, the valve body sandwiches the outer peripheral end portion of the diaphragm valve with a pair of clamping surfaces in the axial direction of the diaphragm valve, and the guide plate An end in the axial direction on the diaphragm valve side is positioned at one of the clamping surfaces on the guide plate side.

  According to a fifth aspect of the present invention, the guide plate according to the fourth aspect is characterized in that the guide plate is configured by a plate-like rib projecting radially inward from the valve body toward the inflow chamber.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, an edge portion of the guide plate formed by the rib has an arc shape in cross section.

Effects and effects of the invention

As described above, the present invention provides a rectifying unit having a plurality of guide plates extending in the axial direction of a diaphragm valve and a plurality of rectifying passages formed between the guide plates in an inflow chamber on the primary side of the diaphragm valve. It is provided.
According to the present invention, the flow of water directed to the diaphragm valve can be adjusted in the axial direction of the diaphragm valve by the rectifying action of the rectifying unit, and can be applied to the diaphragm valve, thereby equalizing the diaphragm valve. Therefore, it is possible to prevent the diaphragm valve from being tilted based on the uneven momentum of the water flow.
This makes it possible to smoothly perform the water discharge operation or flow rate adjustment operation by the diaphragm valve.
Further, since it is not necessary to make a large distance between the inlet for allowing water to flow into the inflow chamber and the valve seat, that is, the diaphragm valve, the diaphragm valve can be downsized.

In the present invention, the rectifier operates as follows.
The flow of water flowing into the inflow chamber from the inflow pipe through the inflow port is greatly disturbed in the inflow chamber when there is no rectifying section, and the water flow is biased with respect to the diaphragm valve in the turbulent state. End up.
This causes the diaphragm valve to tilt.
In particular, when the inflow port is in the horizontal direction as shown in FIG. 15, the flow of water is rapidly changed to the vertical flow when entering the inflow chamber from the horizontal direction. Are particularly prone to flow turbulence and therefore also particularly prone to tilting of the diaphragm valve.

However, according to the present invention, the inflow chamber is provided with a rectification unit including a plurality of guide plates extending in the axial direction of the diaphragm valve and a plurality of rectification passages formed between the guide plates, thereby flowing into the inflow chamber. The flow of water can be applied to the diaphragm valve after adjusting the flow in the axial direction of the diaphragm valve over the entire circumference by the action of the guide plate and the rectifying passage.
As a result, the force acting on the diaphragm valve can be equalized, and the diaphragm valve can be smoothly and uniformly displaced in the axial direction as a whole.

  As is apparent from the above description, the present invention is applied to a case where an inflow port is provided at a predetermined position in the circumferential direction of the inflow chamber and the inflow port is provided in a direction perpendicular to the axis of the diaphragm valve, i. Therefore, the effect is particularly great.

In the present invention, the guide plates in the rectifying section can be oriented radially in the radial direction (claim 2).
By doing so, it is possible to smoothly get over the valve seat from the inflow chamber on the outer peripheral side of the annular valve seat to the outflow passage on the inner peripheral side while rectifying the flow of water in the inflow chamber. it can.

In the present invention, an inner tube portion is provided in the diaphragm valve, the valve seat is configured at the tip of the inner tube portion, and the rectifying portion is connected to the inner tube portion and the valve body, The inner cylinder part and the valve body can be formed integrally (Claim 3).
In this way, the inner cylinder part, the valve body and the rectifying part are formed as an integral part compared to the case where the inner cylindrical part and the valve body are separate parts and the rectifying part is a separate part. As a result, the number of required parts can be reduced.
Alternatively, when the inner cylinder portion and the valve body are integrally connected by the bridge portion, the bridge portion can be made thin.

In the present invention, the outer peripheral end of the diaphragm valve is clamped by a pair of clamping surfaces in the axial direction of the diaphragm valve by the valve body, and the axial direction end of the guide plate on the diaphragm valve side is arranged on the guide plate side. It can be located in the position of one clamping surface (Claim 4).
In this way, the guide plate can be effectively acted as a reversing stopper for preventing the reversal deformation of the diaphragm film in the diaphragm valve, and the reversal deformation of the diaphragm film can be effectively prevented. It is possible to prevent the diaphragm valve from being poorly closed due to the reverse deformation, that is, poor water stoppage.

In this case, the guide plate can be constituted by a plate-like rib projecting radially inward from the valve body to the inflow chamber side.
Further, in this case, the edge portion of the guide plate constituted by the rib can have an arc shape in cross section (Claim 6).
By doing so, it is possible to effectively prevent the diaphragm film from being damaged by the guide plate even if the diaphragm film is deformed on the reverse side.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2, reference numerals 10 and 12 denote a first member and a second member, respectively, which constitute the valve body 13, and the second member 12 further includes a cylindrical upper part 14, a lower part 16, and an intermediate part 18, respectively. They are assembled in the axial direction.
Here, the second member 12, that is, the upper portion 14, the lower portion 16, and the intermediate portion 18 are all made of resin.
Reference numeral 20 denotes an inflow pipe provided in the first member 10, and 22 denotes a cylindrical inner cylinder part incorporated in the hollow part of the first member 10, and its end (upper end in the figure) is annular. It is configured as a valve seat 24 (in detail annular).

On the outer peripheral side of the annular valve seat 24, more specifically, on the outer peripheral side of the inner cylinder portion 22, an annular inflow chamber 50 that is a primary side with respect to a diaphragm valve 26 described later is provided at the lower part of the second member 12 in the valve body. 16 is formed.
Further, an outflow passage 52 which is a secondary side with respect to the diaphragm valve 26 is formed along the inner cylinder portion 22 on the inner peripheral side of the valve seat 24.
Reference numeral 54 represents an outlet.

26 opens and closes the flow path and adjusts the opening of the flow path (hereinafter simply referred to as opening degree adjustment of the flow path including opening and closing of the flow path and adjustment of the opening degree). The diaphragm valve to perform.
The diaphragm valve 26 includes a diaphragm film 28 made of an elastic material such as rubber that also serves as a seal member, and a hard valve body 30.
In the diaphragm valve 26, the outer peripheral end portion of the diaphragm film 28 is fixed and held by the second member 12 in the valve body 13, and the central portion is displaced (advanced and retracted) in the axial direction (vertical direction in the figure). The distance to 24 is changed, and the opening degree of the flow path is changed.

Specifically, the diaphragm valve 26 blocks the flow path by being seated on the valve seat 24, and opens the flow path by being spaced upward from the valve seat 24 in the drawing.
Further, the opening degree of the flow path is changed in accordance with the distance from the valve seat 24 to adjust the flow rate of water flowing through the flow path, that is, the water supply flow rate.

A pressure chamber 32 is formed behind the upper side of the diaphragm valve 26 in the figure.
The pressure chamber 32 causes the internal pressure to act on the diaphragm valve 26 as a pressing force in the downward valve closing direction in the figure.
The diaphragm valve 26 is provided with an introduction small hole 33 that passes through the diaphragm valve 26 and allows the inflow chamber 50 and the pressure chamber 32 to communicate with each other.
The introduction small hole 33 guides water from the inflow chamber 50 to the pressure chamber 32 and increases the pressure in the pressure chamber 32.

The diaphragm valve 26 is also provided with a pilot water channel 34 as a water drainage channel that passes through the diaphragm valve 26 and allows the pressure chamber 32 and the outflow channel 52 to communicate with each other.
The pilot water channel 34 reduces the pressure in the pressure chamber 32 by drawing water in the pressure chamber 32 to the outflow channel 52.

As shown in FIGS. 3 and 4, the diaphragm valve 26 is also provided with a through hole 36 penetrating in the axial direction at the center thereof, and there is a spout water pilot valve and a flow control pilot. A common pilot valve 35 also serving as a valve is inserted, and the pilot water channel 34 having a narrow passage width is formed between the outer peripheral surface of the pilot valve 35 and the inner peripheral surface of the through hole 36. .
The diaphragm valve 26 is integrally provided with a pilot valve seat 37 that forms an annular shape around the axis of the diaphragm valve 26 along the inner peripheral surface of the through hole 36.
Reference numeral 38 denotes a seal portion in the pilot valve seat 37, which holds an O-ring 40 as an elastic seal ring having an annular shape inside the annular groove.

The pilot valve 35 is fitted to the pilot valve seat 37 so as to be movable back and forth in the vertical direction in the figure along the axis of the diaphragm valve 26.
Specifically, the pilot valve 35 has a circular cross section and has a seal portion 42 having the same outer diameter in the vertical direction, that is, the forward and backward direction in the figure, and an annular recess 44 on the lower side (lower side in the figure). is doing.
Each end portion in the axial direction of the annular recess 44 is a tapered surface 46 that gradually becomes smaller in diameter toward the smallest diameter portion of the recess 44, and a step is provided at each end portion on the large diameter side of the tapered surface 46. Attached portions 48 and 49 are formed.

1 and 3 show the state of the pilot valve 35 when the water is stopped. At this time, the pilot valve 35 has a seal portion 42 having a diameter over the entire circumference with respect to the pilot valve seat 37 via the O-ring 40. In this state, the pilot valve 35 and the pilot valve seat 37 are sealed in a watertight manner.
At this time, the diaphragm valve 26 is seated on the valve seat 24, and the flow path is closed.

On the other hand, FIGS. 2 and 4 show the state of the pilot valve 35 when water is discharged. At this time, the pilot valve 35 is in a state where the seal portion 42 is separated from the pilot valve seat 37, and a minute gap is formed between them. Forming.
At this time, the diaphragm valve 26 is spaced upward from the valve seat 24 in the figure, and the flow path is open.

FIG. 8 and FIG. 9 show the action at the time of flow adjustment (flow rate adjustment) by the movement of the pilot valve 35.
In this embodiment, the pilot valve 35 does not close the pilot water channel 34 during flow adjustment, and only the opening degree of the pilot water channel 34 is changed by the movement.
The amount of rotation operation of the operation unit 58 described later is so regulated.

In this embodiment, as shown in FIG. 8 (I), when the pilot valve 35 moves backward in the figure, the clearance between the pilot valve 35 and the pilot valve seat 37 becomes large, and the pressure chamber 32 has a large gap. A large amount of water escapes to the outflow passage 52 side through the pilot water passage 34 and the pressure in the pressure chamber 32 decreases.
Therefore, the diaphragm valve 26 as the main valve moves backward in the figure due to the pressure difference with the inflow chamber 50, and as shown in FIG. 8 (II), the pressure in the inflow chamber 50 and the pressure in the pressure chamber 32 The backward movement of the diaphragm valve 26 stops at the position where the two balance.
By the backward movement of the diaphragm valve 26, the gap between the diaphragm valve 26 and the valve seat 24 becomes large, and the amount of water flowing out from the inflow chamber 50 to the outflow passage 52 increases.

  When the pilot valve 35 is further moved backward in the figure from this state, the diaphragm valve 26 follows the backward movement of the pilot valve 35 so that the pressure in the pressure chamber 32 and the pressure in the inflow chamber 50 are balanced. And move backward to increase the flow rate of the water flowing through the flow path by further widening the opening of the flow path (see FIG. 8 (III)).

  On the other hand, when the pilot valve 35 moves forward downward in the figure as shown in FIG. 9 (I), between the pilot valve 35 and the pilot valve seat 37, more specifically, the seal portion 42 and the pilot valve seat in the pilot valve 35. 37, the gap between the O-ring 40 and the pilot water passage 34 is reduced, and the amount of water flowing from the pressure chamber 32 to the outflow passage 52 is reduced. Pressure increases.

For this reason, the increased pressure causes the diaphragm valve 26 to move forward downward in the figure and stop at a position where the pressure in the pressure chamber 32 and the pressure in the inflow chamber 50 are balanced (see FIG. 9 (II)). .
At this time, the gap between the diaphragm valve 26 and the valve seat 24 is reduced, that is, the opening of the flow path is reduced, and the flow rate of water flowing through the flow path is reduced.

  If the pilot valve 35 further moves downward in the figure from this state, the opening degree of the flow path is further reduced, and the flow rate of water flowing through the flow path is further reduced (see FIG. 9 (III)).

1 and 2, reference numeral 56 denotes a drive shaft. The drive shaft 56 extends in the axial direction with a uniform circular cross section and a uniform outer diameter, and the above-described pilot valve 35 is integrally formed at the bottom of the drawing. ing.
In FIG. 1, reference numeral 58 denotes an operation unit capable of a downward pushing operation and a rotation operation. Between the operation unit 58 and the drive shaft 56, the drive shaft is driven according to the operation amount by the rotation operation of the operation unit 58. 60 is moved forward and backward by screw feed, and the pilot valve 35 is moved forward and backward in the vertical direction in the drawing to change its position, and a flow control mechanism (not shown) for changing the position thereof, and the drive shaft 56, that is, the tip end portion thereof at a constant stroke. A water discharge switching mechanism (not shown) that moves the pilot valve 35 between a water discharge position that is a raised position and a water stop position that is a lowered position and holds the pilot valve 35 at each position is incorporated.
Here, the spouting water switching mechanism includes a thrust lock mechanism that switches the pilot valve 35 between the water spouting position and the water stopping position and holds the pilot valve 35 at the respective positions.

That is, in this embodiment, when the operation unit 58 is rotated, the pilot valve 35 moves up and down in the drawing in accordance with the amount of rotation, and the diaphragm valve 26 is displaced following the movement. This adjusts the flow rate.
On the other hand, every time the operation unit 58 is pushed in, the pilot valve 35 moves forward and backward in a predetermined stroke up and down direction, the diaphragm valve 26 as a main valve is opened and closed, the flow path is opened and closed, water supply and water supply stop, That is, water discharge is performed.

The drive shaft 56 and the pressure chamber 32 are sealed watertight by an O-ring 61.
Further, the lower portion 16 of the second member 12 and the first member 10 in the valve body 13 are sealed in a watertight manner by an O-ring 62.

As shown in FIGS. 3 and 4, the inflow chamber 50 is provided with an inflow port 63 through which water from the inflow conduit 20 flows into the inflow chamber 50 at a predetermined position in the circumferential direction.
Here, the inflow port 63 is formed sideways, that is, sideways perpendicular to the axis of the inner cylinder portion 22 and the diaphragm valve 26.
In the inflow chamber 50, the water flow in the inflow chamber 50 is adjusted in the axial direction of the diaphragm valve 26 between the inlet 63 and the valve seat 24, that is, between the diaphragm valve 26 and the diaphragm valve 26. A rectifying unit 64 is provided to act on H.26.
This rectification | straightening part 64 is also made from resin, and is shape | molded integrally with them in the form which connects the inner cylinder part 22 and the lower part 16 of the 2nd member 12 in a valve body in radial direction.
That is, in this embodiment, the inner cylinder part 22, the lower part 16 of the 2nd member 12, and the rectification | straightening part 64 are comprised by the integrally molded product.

As shown in FIGS. 5 to 7, the rectifying portion 64 is provided at a predetermined pitch in the circumferential direction and extends radially in the radial direction, and a guide plate 68 that is concentric with the inner cylinder portion 22. And a large number of rectifying paths 70A on the inner peripheral side and a large number of rectifying paths 70B on the outer peripheral side partitioned by them.
Here, as shown in FIGS. 3, 4, 6 </ b> B, and 7, each of the rectifying paths 70 </ b> A and 70 </ b> B extends in the axial direction of the diaphragm valve 26, and the upper end and the lower end are respectively in the inflow chamber 50. It is open.

The rectifying unit 64 operates as follows.
That is, when such a rectification part 64 is not provided, the flow of water that flows laterally into the inflow chamber 50 from the inflow port 63 hits the inner cylinder part 22 or the outer peripheral wall of the inflow chamber 50 in a vertical and upward direction. The flow of water acts on the diaphragm valve 26. At this time, in the inflow chamber 50, the resistance to the rapid flow of water and the change in the flow direction cause a strong and weak water flow, and the flow of water. Therefore, the water flow force acting on the diaphragm valve 26 is uneven at each part, and the diaphragm valve 26 is tilted by the action of the uneven force.

However, in this embodiment, since the rectification | straightening part 64 is provided, the flow of the water in the inflow chamber 50 is equalized.
Specifically, in the flow of water flowing into the inflow chamber 50 in the horizontal direction in the figure, the momentum of the horizontal flow is reduced by the resistance action of the vertical guide plates 66 and 68 in the rectifying unit 64, while these guide plates 66 68 and the rectifying passages 70A and 70B formed between them are vertically oriented, so that the flow of water inside the inflow chamber 50 is changed to a flow in the axial direction (vertical direction in the figure) by their guiding action. It is rectified cleanly.
As a result, the flow of water is equalized over the entire circumference, and the flow is adjusted to a flow in the axial direction correctly, and then is applied to the diaphragm valve 26.

That is, the flow of water acts upwardly in the figure on the lower surface of the diaphragm valve 26, and as a result, the diaphragm valve 26 maintains the horizontal posture in the figure without tilting, It is pushed upward by the flow, or moves while maintaining a horizontal posture downward in the figure while receiving a uniform flow of water on its lower surface.
As a result, the instability of the water discharge operation and the flow rate adjustment operation due to the inclination of the diaphragm valve 26 is eliminated, and the water discharge operation and the flow control operation are smoothly performed.
In addition, the flow rate itself is increased by eliminating the occurrence of turbulent flow and stagnation of water in the inflow chamber 50.

According to the present embodiment as described above, the flow of water toward the diaphragm valve 26 can be adjusted in the axial direction of the diaphragm valve 26 by the rectifying action of the rectifying unit 64, and can be applied to the diaphragm valve 26. Thus, the water flow force can be applied evenly to the diaphragm valve 26, and the diaphragm valve 26 can be satisfactorily prevented from tilting based on the uneven water flow force.
As a result, the water stoppage or flow rate adjustment operation by the diaphragm valve 26 can be performed smoothly.
In addition, the distance between the inlet 63 through which water flows into the inflow chamber 50 and the valve seat 24, i.e., the diaphragm valve 26, need not be large, so that the diaphragm valve can be reduced in size.

  In the present embodiment, the guide plate 66 in the rectifying unit 64 is radially oriented and the rectifying paths 70A and 70B between the guide plates 66 and 68 are radially arranged. Can smoothly flow over the valve seat 24 from the inflow chamber 50 on the outer peripheral side of the annular valve seat 24 to the outflow passage 52 on the inner peripheral side.

Furthermore, in this embodiment, since the rectification | straightening part 64 is integrally formed with them in the form which connects the inner cylinder part 22 and valve body in a diaphragm valve, a required number of parts can be reduced.
In the present embodiment, as shown in FIG. 5, the inner cylinder portion 22 and the valve body, more specifically, the lower portion 16 of the second member 12 in the valve body are integrally connected by the bridge portion 72. Since the portion 22 and the lower portion 16 of the valve body are integrally connected by the rectifying portion 64, the bridge portion 72 can be formed thinly in this embodiment, thereby reducing the flow loss due to the bridge portion 72. be able to.

10 to 13 show another embodiment of the present invention.
In FIG. 10, 100 is a flush valve device, 102 is a valve body, and 104 is a diaphragm valve provided on the flow path.

A pressure chamber 32 is formed behind the diaphragm valve 104 (upper side in the figure).
The pressure chamber 32 causes the internal water pressure to act on the diaphragm valve 104 as a downward pressing force (in the valve closing direction).
Reference numeral 106 denotes a pilot water channel as a water drainage channel provided in communication with the pressure chamber 32, and a pilot valve 108 is provided on the pilot water channel 106.

  The water inside the pressure chamber 32 is drawn out to the outflow passage 114B through the pilot water passage 106 by opening the pilot valve 108, where the pressure in the pressure chamber 32 disappears and the diaphragm valve 104 becomes the inflow chamber. The valve is pushed up by the feed water pressure from 50 in the figure to open.

On the other hand, the diaphragm valve 104 is provided with small introduction holes 128A, 128B, and 128C through which the water in the inflow chamber 50 is introduced into the pressure chamber 32 as shown in FIG.
Under the condition that the pilot valve 108 is closed, the water in the inflow chamber 50 is guided to the pressure chamber 32 through the introduction small holes 128A, 128B, 128C, and the pressure in the pressure chamber 32 is increased. When the pressure exceeds a certain level, the diaphragm valve 104 which has once opened is moved downward in the figure by the pressure in the pressure chamber 32 and is seated on the valve seat 24 to be closed.
As shown in FIGS. 10 and 11, the valve body 102 is provided with a stopper 130 that abuts on the diaphragm valve 104 when the diaphragm valve 104 is opened and restricts the valve opening amount, that is, the lift-up amount.

The pilot valve 108 includes a valve body (pilot valve body) 132 and a valve seat (pilot valve seat) 134.
The valve body 132 is normally closed by a spring 136.
In this state, when the push button type operation unit 138 is pushed rightward in the figure against the biasing force of the spring 136, the valve element 132 is separated from the valve seat 134, the pilot valve 108 is opened, and the pressure chamber 32 is opened. The outlet valve 114B communicates with the water passage 106, the pressure in the pressure chamber 32 is released, and the diaphragm valve 104 as the main valve is opened.
When the push-in to the operation unit 138 is stopped, the pilot valve 108 is closed by the spring 136, and then the pressure in the pressure chamber 32 is increased and the diaphragm valve 104 is closed.

The diaphragm valve 104 has a circular planar shape, and has a diaphragm membrane 120 and a valve body 140 as shown in detail in FIG.
The diaphragm film 120 is made of an elastic material such as rubber having flexibility, and an outer peripheral end portion thereof is fixedly attached to the valve body 102.
Specifically, the valve body 102 is fixed to the valve body 102 so as to be clamped in the axial direction of the diaphragm valve 104 by the pair of clamping surfaces 102-1 and 102-2 of the valve body 102. The central portion can be moved in the axial direction, that is, in the vertical direction in FIG.

Diaphragm film 120 is largely bent with a U-shaped cross section at the middle between the outer peripheral end and the center in the upward direction in the figure. In the figure, 144 represents the bent portion.
In this embodiment, the valve main body 140 is constituted by a hard resin member.
The valve main body 140 is fixed to the diaphragm membrane 120 so as to sandwich the central portion of the diaphragm membrane 120 in the axial direction, and the valve main body 140 is integrated with the central portion of the diaphragm membrane 120 in the vertical direction, that is, the axial center in the drawing. It can be moved forward and backward in the direction.

Reference numeral 146 denotes a seal portion made of an elastic material provided on the diaphragm valve 104. The diaphragm valve 104 is seated on the valve seat 122 at the seal portion 146 to shut off the inflow side and the outflow side in a watertight manner.
The valve main body 140 is provided with a guide 150 that is inserted into the inner cylindrical portion 22 to guide movement when the diaphragm valve 104 is opened and closed, and protrudes downward in the drawing.

In the present embodiment, as shown in FIGS. 11 and 12, a plate-like rib projecting radially inward from the valve body 102 toward the inflow chamber 50 is formed integrally with the valve body 102. Thus, a vertical guide plate 152 extending in the axial direction in the inflow chamber 50 is configured.
The guide plates 152 are also provided radially at a plurality of locations along the circumferential direction, and a rectifying passage 70C extending in the axial direction is formed between the guide plates 152 and 152.
The upper ends of the guide plates 152 in the drawings, that is, the axial direction end on the diaphragm valve 20 side, are positioned at the same position as the one clamping surface 102-1 on the guide plate 152 side of the valve body 102. .

Further, as shown in the partial enlarged view of FIG. 12, these guide plates 152 are each formed in a circular arc shape in cross section at each of the upper side in the horizontal direction and the side edge in the vertical direction in the drawing. Further, the corner portion, which is the intersection of the upper side and the side side, has an arc shape in both the longitudinal section and the transverse section.
In this embodiment, a rectifying unit 154 configured by a guide plate 152 radially provided in a state protruding from the valve body 102 toward the inflow chamber 50 and a rectifying path 70 </ b> C therebetween has the same rectifying action as described above. In addition, the guide plate 152 also functions as a reversing stopper that prevents reversal deformation of the diaphragm film 120.

  That is, if the guide plate 152 that functions as such a reversing stopper is not provided, the diaphragm film 120, specifically, the bent portion 144 is shown in FIG. 14A (comparative example). In the present embodiment, the upper end of the guide plate 152 is deformed in the reverse direction from the normal state shown in FIG. 14B. By abutting against this and acting as a stopper, it works to prevent reverse deformation of the diaphragm film 120.

Therefore, in the diaphragm valve of the present embodiment, the bending length of the bent portion 144 of the diaphragm film 120 is long, and the reverse deformation of the diaphragm film 120 is satisfactorily prevented even though the diaphragm valve has a large moving stroke. .
Therefore, in this embodiment, it is possible to prevent the diaphragm valve 104 from causing a valve closing failure, that is, a water stop failure due to the reverse deformation of the diaphragm film 120.

  Further, since each edge portion of the guide plate 152 has an arc shape in cross section, it is effective that the diaphragm film 120 is damaged by the guide plate 152 even if the diaphragm film 120 is deformed on the reverse side. Can be prevented.

Although the embodiment of the present invention has been described in detail above, this is merely an example.
For example, the present invention can be applied to a diaphragm valve that performs only discharge water, or can be applied to a diaphragm valve that performs only flow rate adjustment, and a diaphragm valve as a main valve by the pilot valve as described above. The present invention can be applied not only to a diaphragm valve of a type that controls the operation of the valve, but also to a diaphragm valve that does not include such a pilot valve, or includes only a diaphragm valve as a main valve. It can be configured in variously modified forms within a range that does not.

It is a figure which shows the diaphragm valve which is one Embodiment of this invention in a water stop state. It is a figure which shows the diaphragm valve which is one Embodiment of this invention in a water discharging state. It is a principal part enlarged view of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a perspective view which shows the rectification | straightening part in the same embodiment with a peripheral part. It is the top view and sectional drawing of the part shown in FIG. FIG. 6 is a perspective view in which a part shown in FIG. 5 is cut away. It is operation | movement explanatory drawing at the time of the flow volume adjustment in the embodiment. FIG. 9 is an operation explanatory diagram following FIG. 8. It is a figure which shows the diaphragm valve which is other embodiment of this invention in a water stop state. It is a principal part enlarged view of FIG. It is a perspective view which shows the rectification | straightening part in the same embodiment with a peripheral part. It is a principal part enlarged view which shows the diaphragm valve of FIG. 10 in the water discharging state. It is a comparative example figure for demonstrating the advantage of the embodiment. It is a figure which shows an example of the conventional diaphragm valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st member 12 2nd member 13,102 Valve body 20 Inflow pipe line 22 Inner cylinder part 24 Valve seat 26,104 Diaphragm valve 50 Inflow chamber 52 Outflow path 63 Inlet 64,154 Rectification part 66,68,152 Guide plate 70A, 70B, 70C Rectifier

Claims (6)

(B) an annular valve seat; (b) a diaphragm valve that is displaced in the axial direction with the outer peripheral end held by the valve body; and (c) an inflow conduit formed on the outer peripheral side of the valve seat. An inflow chamber on the primary side of the diaphragm valve for allowing water from the inlet to flow in through the inlet, and (d) an outflow passage on the secondary side of the diaphragm valve formed on the inner peripheral side of the valve seat. comprising forming Ri with the with the inflow chamber is provided in a form extending in a circumferential direction of said valve seat, said inlet port said water from partially and the inflow conduit to a flow entry in the circumferential direction A diaphragm valve that is provided in such a direction that it flows into the inflow chamber in a direction different from the axial direction of the diaphragm valve, and that changes the flow direction of the water flowing in from the inflow chamber toward the diaphragm valve in the inflow chamber. In
A plurality of guide plates provided between the diaphragm valve and the inlet in the axial direction of the diaphragm valve and extending in the axial direction of the diaphragm valve , and a plurality of rectifying paths formed between the guide plates. Yes, and a diaphragm valve, wherein a rectifier for the flow of incoming water and trimmed in the axial direction of flow of said diaphragm valve to act on the diaphragm valve is provided on the inlet chamber from the inlet.   2. The diaphragm valve according to claim 1, wherein the plurality of guide plates in the rectifying section are radially oriented in the radial direction.   The valve seat according to any one of claims 1 and 2, wherein the valve seat is configured at a tip portion of an inner cylinder portion, and the rectifying portion connects the inner cylinder portion and the valve body. And a diaphragm valve formed integrally with the valve body.   3. The valve body according to claim 2, wherein the valve body clamps the outer peripheral end of the diaphragm valve with a pair of clamping surfaces in the axial direction of the diaphragm valve, and the axial direction of the guide plate on the diaphragm valve side The diaphragm valve is characterized in that an end is positioned at one of the clamping surfaces on the guide plate side.   5. The diaphragm valve according to claim 4, wherein the guide plate is configured by a plate-like rib projecting radially inward from the valve body toward the inflow chamber.   6. The diaphragm valve according to claim 5, wherein an edge portion of the guide plate constituted by the rib has a circular arc shape in cross section.

Images