JPH01193479A - Solenoid valve - Google Patents

Abstract

PURPOSE:To prevent effectively the occurrence of uncomfortable sounds by forming a fluid resistance generating portion for throttling in two steps fluid flowing into a main vale hole from an inlet between a main valve seat and a diaphragm. CONSTITUTION:An upper fluid throttle section (a) is formed between the lower surface 5a of a diaphragm 5 and a main valve seat 4 having a semicircular section, and a lower fluid throttle portion b is formed between the lower stage portion of a vertical tubular wall 15 and the tubular tapered surface 16a of a drop-out preventing projection 16. Thus, fluid resistance is increased in stopping water to slowly lower the diaphragm 5 and the diaphragm 5 can bear against the main valve seat 4 softly to stop water, so that the occurrence of water hammer in stopping water can be prevented as few as possible. Thus, the vibration of diaphragm 5 can be prevented and the occurrence of uncomfortable sounds can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a solenoid valve that can be effectively used as a solenoid valve for controlling fluid, such as a water stop valve or a hot/cold mixer faucet.

(b) Prior Art FIG. 5 is a sectional view of a conventional pilot type solenoid valve described in Japanese Patent Publication No. 49-4423.

A main valve hole 3 is formed in the valve box C between the inlet 1 and the outlet 2, and on the main valve seat 4 provided at the upper opening periphery of the main valve hole 3,
A diaphragm 5 with a retainer 6 that opens and closes the main valve hole 3 is arranged so as to be able to come into contact with or come into contact with and separate from the main valve hole 3.

A vertically long pilot valve hole 7 is formed in the center of the retainer 6, and a bleed hole 9 with a smaller diameter than the pilot valve hole 7 is formed between the diaphragm back chamber 8 provided at the back of the diaphragm 5 and the inlet 1. has been done. Viloft valve hole 6
On the top is a plunger 11 driven by a solenoid 10.
The pilot valve hole 7 is opened and closed by a valve body 12 attached to the lower end of the plunger 11.

In such a configuration, the solenoid 10 is de-energized,
The plunger 11 is pushed down by the coil spring 13,
When the valve body 12 comes into contact with the valve seat of the pilot valve hole 7 and closes the pilot valve hole 7, fluid flows into the diaphragm back chamber 8 through the path of the inlet 1 - the bleed hole 9 - the diaphragm back chamber 8, The inflowing fluid pressure causes the diaphragm 5 to close to the main valve seat 4.
, and the main valve hole 3 is closed.

In addition, in the closed state shown in the figure, the solenoid 1o is energized, and the plunger 11 is moved against the coil spring 13 to move the iron core 1o.
4, the valve body 12 separates from the valve seat of the pilot valve hole 7 and the pilot valve hole 7 opens.Then, the fluid in the diaphragm 5 passes through the pilot valve hole 7 and exits. It flows out to the 2nd side.

At this time, since the diameter of the pilot valve hole 7 is larger than the diameter of the bleed hole 9, the amount of outflow is greater than the amount of inflow into the diaphragm back chamber 8, and the pressure in the diaphragm back chamber 8 is reduced. As a result, the diaphragm 5 is pushed up by the pressure of the fluid flowing in through the inlet 1, and the diaphragm 5 is separated from the main valve seat 4 to open the main valve hole 3.

(c) Problems to be Solved by the Invention However, in such a conventional solenoid valve, as shown in FIG. This can only be done by lowering and touching the top.

Therefore, when the water is stopped, sufficient resistance cannot be applied to the fluid, and even if the secondary pressure of the water outlet side flow path can be maintained constant, the primary side pressure of the water supply flow path suddenly increases as shown in Figure 7. This caused a water hammer phenomenon. In addition, due to this water hammer, during water stop operation,
The diaphragm of the solenoid valve was vibrating, causing unpleasant noises such as impact sounds.

SUMMARY OF THE INVENTION An object of the present invention is to provide a solenoid valve that can prevent as much as possible the unpleasant noise caused by the water hammer.

(d) Means for solving the problem The present invention forms a main valve hole between an inlet and an outlet provided in a valve box, and a main valve seat provided on one side periphery of the main valve hole. A pilot valve hole is formed in the center of the retainer, which abuts the diaphragm that opens and closes the hole so that it can come and go freely, and supports the diaphragm.The pilot valve hole connects the diaphragm back chamber formed at the back of the diaphragm with the outlet side. At the same time, the diaphragm back chamber and the inlet side are communicated through a bleed hole with a diameter smaller than the pilot valve hole, and a plunger driven by a solenoid is installed above the pilot valve hole, and In a solenoid valve configured so that the pilot valve hole is opened and closed by the valve body, fluid resistance is generated between the main valve seat and the diaphragm that can throttle the fluid flowing into the main valve hole from the inlet in two stages. The present invention relates to a solenoid valve characterized by forming a section.

(e) Actions and Effects With the configuration described above, the present invention has the following actions and effects.

In other words, a fluid resistance generating part is formed between the main valve seat and the diaphragm that can throttle the fluid flowing into the main valve hole from the inlet in two stages, increasing the fluid resistance when water is stopped and causing the diaphragm to The water can be shut off by lowering the valve slowly and making soft contact with the main valve seat.

Therefore, it is possible to prevent the occurrence of water hammer as much as possible when the water is cut off, prevent the vibration of the diaphragm of the solenoid valve, perform the water cutoff operation quietly, and effectively prevent the generation of unpleasant noises. .

(f) Examples The present invention will now be explained in detail based on examples shown in the accompanying drawings.

As shown in FIG. 1, the solenoid valve A according to this embodiment has substantially the same configuration as the conventional solenoid valve described above, except that it includes a fluid resistance generating section B. In the figure,
Components having similar functions are indicated by the same reference numerals, and since the description of these components has already been explained in the description of the prior art, it will be omitted here.
The following explanation focuses on the configuration of .

1 and 2, reference numeral 15 denotes a vertical cylindrical wall that forms the main valve seat 4 with a semicircular cross section at the top;
has an annular tapered surface 15a that gradually expands upward on the upper part of its inner surface, and an annular vertical surface 15b that extends perpendicularly from the upper end of the annular tapered surface 15a and communicates with the inner surface of the main valve seat 4.
is formed.

An upper step portion and a lower step portion are formed at the base end portion of the main valve seat portion 4 and the annular tapered surface 15a, respectively.

Reference numeral 16 denotes a retainer prevention protrusion provided at the center of the retainer 6, and the protrusion 16 has a cylindrical tapered surface 16a whose diameter gradually decreases downward on its periphery, and The inclination angle of the cylindrical tapered surface 16a is made approximately equal to the inclination angle of the line connecting the upper and lower step portions of the main valve seat 4 described above.

With this configuration, an upper fluid restricting portion a can be formed between the lower surface 5a of the diaphragm 5 and the main valve seat 4 having a semicircular cross section, and the lower step portion of the vertical cylindrical wall 15 and the retaining prevention protrusion 16 can be formed. A lower fluid constriction portion can be formed between the cylindrical tapered surface 16a and the cylindrical tapered surface 16a.

Next, to explain the operation of the fluid resistance generating part B having the above configuration, when the diaphragm 5 is integrated with the retainer 6 and approaches the main valve seat 4 when water is stopped, the main valve hole is opened from the inlet l. The fluid flowing into 3 flows through two constricted parts a and b.
This will result in large fluid resistance. and,
In response to this fluid resistance, the diaphragm 5 slowly approaches the main valve seat 4 and comes into soft contact with the main valve seat 4 to complete water shutoff.

Therefore, the occurrence of water hammer when water is stopped due to sudden contact of the diaphragm 5 with the main valve seat 4 can be prevented as much as possible.

That is, as shown in FIG. 3, the attenuation curve of the return wave pressure P1 on the water supply side is relaxed to maintain the same return wave pressure P1 at all times.
The water discharge side pressure P2 can be maintained higher than the water discharge side pressure P2, and the generation of vibration to the diaphragm 5 that occurs when the water discharge side pressure P2 is higher than the water supply side return wave pressure P1 or in an equivalent case can be effectively prevented. Water stopping operation can be performed quietly, and generation of unpleasant noise can be effectively prevented.

Further, another embodiment is shown in FIG. 4, and this embodiment is as follows.
The upper part of the vertical cylindrical wall 15 formed by the fluid resistance generating part B is simply formed by an annular tapered surface 17 that connects the inner surface of the vertical cylindrical wall 15 and the inner surface of the main valve seat 4. .

A lower step portion is formed at the lower end of the annular tapered surface 17.

In addition, the retainer 6 has a retaining protrusion 1 provided at its center.
8 is similar to the embodiment shown in FIG. 2, and the inclination angle of the cylindrical tapered surface 18a is approximately equal to the inclination angle of the annular tapered surface 17 described above.

With this configuration, similarly to the embodiment shown in FIG. 2, it is possible to form an upper fluid restricting portion a between the lower surface 5a of the diaphragm 5 and the main valve seat 4 having a semicircular cross section, and
A lower fluid restriction portion can be formed between the lower step of the vertical cylindrical wall 15 and the cylindrical tapered surface 18a of the retaining prevention protrusion 18, so that the diaphragm 5 suddenly comes into contact with the main valve seat 4. It is possible to prevent as much as possible the occurrence of water hammer caused by water stoppage, thereby reliably preventing the occurrence of unpleasant sounds.

As explained above, this embodiment has the following effects.

That is, a fluid resistance generating part B is formed between the main valve seat 4 and the diaphragm 5, which can throttle the fluid flowing into the main valve hole 3 from the inlet l in two stages, so that the fluid resistance when water is stopped is reduced. The diaphragm 5 can be slowly lowered and brought into soft contact with the main valve seat 4 to shut off water.

Therefore, it is possible to prevent the occurrence of water hammer as much as possible when water is stopped, vibrations are prevented from occurring, and unpleasant noises can be reliably prevented from occurring when water is stopped.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view showing the overall configuration of the solenoid valve according to the present invention, Fig. 2 is an enlarged explanatory view of the main parts, and Fig. 3 is a change over time in return wave pressure on the water supply side and water discharge side pressure in the solenoid valve. A diagram showing the state, FIG. 4 is an enlarged explanatory view of main parts of another embodiment, FIG. 5 is a cross-sectional front view showing the overall configuration of the conventional solenoid valve, and FIG. 6 is a diagram showing the present invention in the conventional solenoid valve. FIG. 7 is an enlarged explanatory view of the related parts, and is a diagram showing the temporal fluctuations of the return wave pressure on the water supply side and the pressure on the water discharge side in the electromagnetic valve. In the figure, A: Solenoid valve B: Fluid resistance generating part 1: Inlet
2: Outlet 3: Main valve hole 4: Main valve seat 5: Diaphragm 6: Retainer 7: Pilot valve hole 8: Diaphragm back chamber 9 nib lead hole
lO: Solenoid 11 Nibrangier 12: Valve body Patent applicant: TOTOKIKI CO., LTD.

Claims (1)

[Claims] 1. A main valve hole (3) is formed between an inlet (1) and an outlet (2) provided in the valve box (C), and is provided at one side periphery of the main valve hole (3). A diaphragm (5) that opens and closes the main valve hole (3) is in contact with the main valve seat (4) so as to be able to move toward and away from the main valve seat (4), and a pilot valve hole is provided in the center of the retainer (6) that supports the diaphragm (5). (7), and the pilot valve hole (7) communicates the diaphragm back chamber (8) with the outlet (2) side, and the bleed hole (9) connects the diaphragm back chamber (8) with the inlet (1) side. ), a plunger (11) driven by a solenoid (10) is arranged above the pilot valve hole (7), and a valve body (12) attached to the lower end of the plunger (11) In a solenoid valve configured to open and close a pilot valve hole (7), an inlet (1) is located between the main valve seat (4) and the diaphragm (5).
) A solenoid valve characterized in that a fluid resistance generating portion (B) is formed that can throttle the fluid flowing into the main valve hole (3) in two stages.