JPH08178109A - Solenoid-driven diaphragm valve structure - Google Patents

Abstract

PURPOSE: To regulate secondary side pressure and a flow rate, to prevent wear due to an excessive stroke of a diaphragm and to improve durability of the diaphragm by providing a stopper to regulate the opening valve stroke of the diaphragm. CONSTITUTION: A diaphragm valve V is constituted of an upper part shell 21 continuously provided on a lower surface of a casing 1, a lower part shell 22, a diaphragm 23 and a movable valve body 24. Additionally, stoppers 11, 11 of roughly circular arc sections are provided suspended on a lower surface of a lower flange 9. Roughly circular arc stopper insertion holes 14, 14 are formed on the outside of a plunger insertion hole 13, and the stoppers 11, 11 are inserted into them through. As lower ends of the stoppers 11, 11 provided suspended from a lower end surface of a coil bobbin 2 in an opening valve shape make contact with an upper surface of a flange part 33 of the movable valve body 24, it is possible to regulate upward movement of the diaphragm 23 even when a plunger ring 5 moves upward by magnetic force of a solenoid S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid driven diaphragm valve structure.

[0002]

2. Description of the Related Art Conventionally, in a solenoid driven diaphragm valve, as shown in FIG. 4, an outer periphery of a flange b for fixing a diaphragm a is extended upward in a substantially cylindrical shape, and an extension end c thereof is provided. It acts as a stopper that regulates the valve opening stroke of the diaphragm a.

[0003]

However, recently, as shown in FIG.
At the lower end of the plunger d,
There is one in which a substantially washer-shaped plunger ring f biased downwardly by is externally fitted to enhance the magnetic efficiency. In such a solenoid driven diaphragm valve, the plunger ring f with which the extending end c abuts is , It does not function as a stopper because it moves upward due to the magnetic force of the solenoid g, and therefore the valve opening stroke of the diaphragm a becomes too large, making it difficult to set the pressure and flow rate on the secondary side. Therefore, there is a problem that the wear of the diaphragm is accelerated and the durability is deteriorated.

[0004]

SUMMARY OF THE INVENTION In the present invention, a diaphragm in a solenoid is adapted to open and close a valve by a diaphragm responsive to the operation of the plunger, and a plunger ring for enhancing magnetic efficiency is fitted to the plunger. It is intended to provide a solenoid-driven diaphragm valve structure characterized in that a stopper for restricting the opening stroke of the diaphragm is provided in the solenoid-driven diaphragm valve.

Another feature is that the stopper is formed on the solenoid side so as to be able to come into contact with the diaphragm through the plunger ring.

[0006]

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

FIG. 1 shows a solenoid-driven diaphragm valve A according to the present invention. The valve A is composed of a solenoid S provided above and a diaphragm valve V continuously provided below the solenoid S.

As shown in the figure, the solenoid S includes a coil bobbin 2 arranged in a casing 1, a coil 3, a plunger 4, a plunger ring 5 fitted on the lower end of the plunger 4, and a plunger ring 5 downward. And a weak spring 6 that urges the

The coil bobbin 2 has flanges 8 and 9 on both upper and lower ends of a substantially cylindrical bobbin main body 7 which also serves as a plunger guide.
The coil 3 is wound around the outer circumference of the bobbin main body 7 between the upper and lower flanges 8 and 9, and stoppers 11 and 11 having a substantially arc-shaped cross section are vertically provided on the lower surface of the lower flange 9.

The plunger 4 has a substantially columnar shape and is vertically slidably inserted in the coil bobbin 2.
A pilot valve body 12 is fitted on the lower end surface.

As shown in FIGS. 1 and 2, the plunger ring 5 has a substantially circular plate shape with a substantially circular plunger insertion hole 13 formed in the center thereof, and a substantially arc-shaped stopper outside the plunger insertion hole 13. The insertion holes 14 and 14 are formed to allow the stoppers 11 and 11 to be inserted therethrough.

The spring 6 is interposed between the stepped portion 15 formed on the lower inner peripheral surface of the coil bobbin 2 and the upper surface of the plunger ring 5.

The diaphragm valve V is mainly composed of an upper shell 21, a lower shell 22, a diaphragm 23, and a movable valve body 24 which are connected to the lower surface of the casing 1.

The upper shell 21 has a substantially cylindrical shape, an upper end surface thereof is in close contact with the lower surface of the casing 1, and a diaphragm pressing portion 25 is formed on the lower end surface thereof.

The lower shell 22 is composed of an annular inflow passage 26 connected to an external water source and an outflow passage 27 concentrically provided inside the inflow passage 26. valve seat
28 are formed.

The diaphragm 23 is formed of a flexible material such as rubber with cloth into a substantially disk shape, and has a thick peripheral edge portion, and the diaphragm pressing portion 25 of the upper shell 21 and the inflow passage.
With the upper surface of the stepped portion 29 formed on the inner peripheral surface of 26, the diaphragm
23 While maintaining watertightness by pressing the peripheral edge,
The upper surface of the diaphragm 23, the upper shell 21, and the lower surface of the casing 1 form a diaphragm back chamber 30.

The central portion of the diaphragm 23 is also formed thick, and the lower surface of the central portion functions as the main valve body 31,
The valve function is performed by contacting and separating from the main valve seat 28. Further, the diaphragm 23 is formed with an orifice 32 that connects the diaphragm back chamber 30 and the inflow passage 26.

The movable valve body 24 is formed in a substantially cylindrical shape having a flange 33 for mounting the diaphragm 23 in the middle thereof, and the upper end portion is reduced in diameter to the pilot valve body 12 on the lower end surface of the plunger 4. A pilot valve seat 34 that contacts and separates is formed and is attached to the central portion of the diaphragm 23.

The embodiment of the present invention is constructed as described above, and when the solenoid S is not energized, the plunger 4 is positioned downward, the pilot valve body 12 closes the pilot valve seat 34, and the orifice The pressure of the diaphragm back chamber 30 is increased by the pressure water from the external water source flowing from 32,
The diaphragm 23 moves downward, the main valve body 31 closes the main valve seat 28 to close the valve, and this state is maintained.

When the solenoid S is energized, as shown in FIG. 3, the plunger 4 is located above and the pilot valve seat 34 is opened, and the pressure water in the diaphragm back chamber 30 flows out from the pilot valve seat 34. As a result, the diaphragm 23 moves upward, the main valve seat 28 opens, and the valve is opened, and this state is maintained.

Particularly, in the valve open state, since the lower ends of the stoppers 11 and 11 suspended from the lower end surface of the coil bobbin 2 contact the upper surface of the flange portion 33 of the movable valve body 24, the plunger ring 5 causes the magnetic force of the solenoid S. Even if you move up with
The upward movement of the diaphragm 23 can be restricted.

Since the opening stroke of the diaphragm 23 at the time of opening the valve can be regulated in this way, the pressure and flow rate on the secondary side can be regulated, and wear of the diaphragm 23 due to an excessive stroke can be prevented. And then the diaphragm
The durability of 23 can be improved.

Further, the structure is simple because it is sufficient to hang the stoppers 11 and 11 from the lower end surface of the coil bobbin 2.
The cost is also low.

[0024]

According to the present invention, a solenoid-operated diaphragm valve is constructed so that the diaphragm in the solenoid responds to the actuation of the plunger to open and close the valve, and the plunger is fitted with a plunger ring for increasing the magnetic efficiency. In the above, since the stopper for regulating the valve opening stroke of the diaphragm is provided, the valve opening stroke of the diaphragm at the time of valve opening can be regulated, so that the pressure and the flow rate on the secondary side can be regulated. In addition, it is possible to prevent wear of the diaphragm due to an excessive stroke, and improve the durability of the diaphragm.

Further, since the stopper is formed on the solenoid side so as to be able to contact the diaphragm by inserting the plunger ring, the structure of the stopper can be simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of a solenoid driven diaphragm valve of the present invention (closed state).

FIG. 2 is a sectional view taken along line I-I in FIG.

FIG. 3 is a vertical cross-sectional explanatory view of the valve (in a valve open state).

FIG. 4 is a vertical cross-sectional explanatory view of a conventional solenoid-driven diaphragm valve.

FIG. 5 is a vertical cross-sectional explanatory view of a conventional solenoid-driven diaphragm valve.

[Explanation of symbols]

 A Solenoid driven diaphragm valve S Solenoid 4 Plunger 5 Plunger ring 11 Stopper 23 Diaphragm

Claims (2)

[Claims] 1. A plunger (4) in a solenoid (S) configured to open and close a valve by a diaphragm (23) responsive to the operation of the plunger (4), and further, a plunger ring for increasing magnetic efficiency in the plunger (4). A solenoid-driven diaphragm valve structure (A) in which (5) is fitted, wherein a stopper (11) for restricting the opening stroke of the diaphragm (23) is provided. 2. The stopper (11) is formed on the solenoid (S) side so that it can abut the diaphragm (23) through the plunger ring (5). Solenoid driven diaphragm valve structure described.