JPH0729349Y2 - Pilot valve - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot valve, and more particularly to a pilot valve used in an automatic faucet, an automatic toilet bowl cleaning device and the like.

[0002]

2. Description of the Related Art Conventionally, in a pilot valve used for an automatic faucet or the like, an orifice plate having an orifice hole is arranged in the middle of a fluid passage, and a solenoid valve for opening and closing the passage is provided downstream of the orifice. It is arranged.
Further, in order to prevent clogging of the orifice holes, a mesh strainer is provided upstream of the orifice plate (for example, Japanese Patent Laid-Open No. 54-9021).

[0003]

However, installing a strainer on the upstream side of the orifice plate causes an increase in cost. An object of the present invention is to provide a pilot valve that can reduce the number of parts and can reliably prevent clogging of foreign matter in an orifice hole.

[0004]

The present invention is directed to an orifice plate disposed in the middle of a fluid passage and having an orifice hole, and an electromagnetic valve disposed downstream of the orifice in the fluid passage for opening and closing the passage. In the pilot valve provided with, a passage forming protrusion made of the same material as the orifice plate is integrally formed on the upstream surface of the orifice plate, and the passage forming protrusion reaches the orifice hole and the minimum clearance is equal to or smaller than the orifice diameter. The gist of this is a pilot valve having a passage whose area is larger than the area of the orifice hole.

[0005]

When the solenoid valve is actuated to open the fluid passage, the fluid flows from the upstream side of the orifice plate through the flow passage and the orifice hole. When a fluid containing a foreign matter flows from the upstream side of the orifice plate, the passage-forming projections prevent the foreign matter from entering the orifice hole and prevent the orifice hole from being blocked.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to the drawings. The pilot valve of the present embodiment is embodied in an automatic faucet with a power generator, and can stop and supply water by electric power as well as generate electricity during water supply. As shown in FIG. 1, the bodies 1 and 2 made of cast bronze are connected and fixed by bolts 3, and the body 1 has an inflow port 4 and an outflow port 5 and a water channel 6 (see FIG.
(Indicated by a chain line) is formed. A diaphragm-type main valve 7 is sandwiched between the bodies 1 and 2 in the middle of the water channel 6. A diaphragm plate 8 as an orifice plate is fixed to the main valve 7 by a diaphragm holder 9. The main valve 7 can be seated on the valve seat 10 and is biased in the seating direction by a spring 11.

A strainer 13 of about 30 mesh is provided at the inflow port 4. This strainer 13
This is to prevent a large amount of dust from flowing into the water channel 6 to get caught in the valve seat 10 and cause a defective valve seal or the like. 2 shows a view of the diaphragm plate 8 in FIG. 1 as viewed from the direction of arrow A, FIG. 3 shows a cross section taken along the line BB in FIG. 2, and FIG.
The C arrow line view in FIG. As shown in FIGS. 2, 3 and 4,
A circular protrusion 52 is formed on the surface of the diaphragm plate 8 made of synthetic resin that is in contact with the water channel 6, and the protrusion 52 is formed with a circular recess 46 that opens to the upstream side. Further, the orifice hole 4 is formed at the center of the bottom of the recess 46.
7 is formed in a penetrating state. Here, the diameter of the orifice hole 47 is Do, the inner diameter of the concave portion 46 is D2, and the outer diameter of the protruding portion 52 is D3.

Further, the inner wall in the recess 46 is 120 °
Three plate-like protrusions 48 as passage-forming protrusions are integrally formed for each of them. The plate-like protrusions 48 extend toward the center of the recess 46 and are separated from each other by a predetermined distance in the center. This portion forms a circular passage 49 extending in the central axis direction in the recess 46 and reaching the orifice hole 47. Further, on the tip side of each plate-like protrusion 48, the plate-like protrusions 48 are separated from each other by a distance L1.
Only separated from each other. This portion is a slit-shaped passage 50 extending in the central axis direction in the recess 46 and reaching the orifice hole 47 via the circular passage 49. The plate-like protrusions 48 are spaced from each other by a distance L2 on the base end side of the plate-like protrusions 48, and the length of each plate-like protrusion 48 in the axial direction is L3. And the relationship of the dimensions of each part is
D ₁ ≤D 0, D ₂ > Do, L ₁ ≤D 0, L ₂ > Do.

As described above, the circular passage 4 is formed by the plate-like protrusion 48.
9 and a slit-shaped passage 50 are formed, and the passage 49,
50 reaches the orifice hole 47, and the minimum clearance (D1,
L1) is less than the orifice diameter (Do) and the area is larger than the area of the orifice hole 47. That is,
^{{ΠDo 2/4} <{} (πD 1 2/4) + (3 · L
₁ L ₃ )}.

The material of the diaphragm plate 8 is preferably polyacetal copolymer or PPO (polyphenylene oxide) resin in consideration of water resistance when used for water supply. On the other hand, in FIG. 1, the main chamber 12 is partitioned and formed by the main valve 7, and the main chamber 12 communicates with the upstream water passage 6 of the main valve 7 through the orifice hole 47 of the diaphragm plate 8. The main chamber 12 communicates with a sub chamber 16 through a passage 15 formed in the body 1, and the sub chamber 16 communicates with a second chamber R2 of a water wheel 27 described later through a passage 17.

A cylindrical movable core 18 is provided in the sub chamber 16, and the tip end surface of the movable core 18 can be seated on the opening surface of the passage 17 to close the passage 17. Further, the fixed core 19 is arranged so as to face the rear end surface of the movable core 18 with a slight gap. The fixed core 19 is fixed in the coil 20, and the coil 20 includes the yoke 21, the first ring 22,
It is fixed to the body 1 via an annular magnet 23 and a second ring 24. The annular magnet 23 is magnetized in the plate thickness direction. Further, a cylindrical cylinder 25 is provided so as to penetrate through the inner holes of the coil 20, the rings 22 and 24, and the annular magnet 23, and the fixed core 19 is inserted thereinto and the movable core 18 is movable in the axial direction. Has been inserted.
A compression coil spring 26 is interposed between the movable core 18 and the fixed core 19 to urge the movable core 18 in the seating direction.

Next, the power generator will be described. The body 2 is formed with a recess 28 for accommodating the water turbine 27.
The turbine 27 is a Francis type turbine, and is fixed to a turbine main body 29 made of polyacetal with a stainless steel shaft 30 penetrating therethrough. The water turbine main body 29 has a disk-shaped back plate 31 and a large number of blade portions 32 radially protruding from the lower surface thereof. Further, the back plate 31 of the water wheel main body 29 is provided with a large number of through holes 33 on the center side thereof. A permanent magnet 34 is fixedly provided on the back plate 31 of the water wheel main body 29. The permanent magnet 34 has N and S poles alternately magnetized in the circumferential direction of the water wheel 27.

An annular pedestal 35 is provided in the recess 28 of the body 2.
Is inserted, and an inclined portion 35a is formed on the inner peripheral side of the pedestal 35. The outer peripheral portion of the back plate 31 of the water turbine 27 is placed on the slanted portion 35 a of the pedestal 35. A case 36 made of a thin stainless steel plate is arranged above the back plate 31 of the water wheel 27 so as to surround the water wheel 27 and the permanent magnet 34.

The lower end of the shaft 30 of the water turbine 27 is supported by a radial bearing 38 fixed to the body 2, and the upper end is supported by a radial bearing 39 fixed to the case 36. . Further, in the water turbine 27, the shaft 30 is slidable in the radial bearings 38 and 39 so as to be movable in the axial direction (thrust direction). The radial bearings 38 and 39 are made of Teflon resin.

Further, a yoke 40 made of a soft magnetic material is in contact with the case 36 on the outer peripheral side of the permanent magnet 34.
Is fixed to the body 2 with bolts 41, and a coil bobbin 45 having a stator coil 42 wound inside the yoke 40.
Is installed. This stator coil 42 is connected to an external device at a terminal 43. The body 2 and the case 36 are sealed by an O-ring 37.

The vortex chamber 4 is formed on the bottom surface of the recess 28 of the body 2.
4 is formed, and the vortex chamber 44 is connected to the downstream water passage 6 of the main valve 7. In this way, the water wheel 27 and the permanent magnet 34 are submerged in the case 36 in the recess 28 of the body 2. In the recess 28 of the body 2, below the back plate 31 of the water turbine 27 is a first chamber R1, and above the back plate 31 of the water turbine 27 is a second chamber R2. Then, as described above, the passage 17 communicates with the second chamber R2, and the second chamber R2 and the first chamber R1 further have the through hole 33.
Therefore, after all, the passage 17 is in communication with the first chamber R1 on the downstream side of the water turbine 27 through the second chamber R2 and the through hole 33.

In this embodiment, the main chamber 12, the passage 15, the sub chamber 16 and the passage 17 constitute a fluid passage, and the movable core 18, the fixed core 19, the coil 20, the yoke 21 and the first ring are formed. 22, annular magnet 23, and second ring 24
An electromagnetic valve is composed of the cylindrical cylinder 25, the compression coil spring 26, and the like. Next, the operation of the automatic faucet with a power generator configured as described above will be described.

First, the operation of the automatic faucet will be described with reference to FIG.
As shown in, when the coil 20 is not energized when the movable core 18 is closed, the magnetic flux from the annular magnet 23 causes the second ring 24, the movable core 18, the fixed core 19, the yoke 21, the first ring 22, and the annular magnet. It flows in the order of 23. As a result, a suction force acts between the movable core 18 and the fixed core 19. However, since the separation distance between the fixed core 19 and the movable core 18 is large, the attraction force between these cores is weak,
The biasing force of the spring 26 exceeds the magnetic attraction force, and the movable core 18
Keeps the valve closed.

When the movable core 18 is closed, the coil 2
When a current is passed in the direction in which a magnetic flux in the same direction as the magnetic flux is generated in 0 (this is defined as a positive direction), the magnetic attraction force by the annular magnet 23 increases, and the movable core 18 overcomes the biasing force of the spring 26. The fixed core 19 is approached. Then, once the movable core 18 starts to approach the fixed core 19, the gap between the cores 18 and 19 becomes smaller, the magnetic flux attracting force further increases, and the movable core 18 is firmly attracted and held,
The movable core 18 is opened. Even if the energization of the coil 20 is stopped when the movable core 18 is opened, the gap between the cores 18 and 19 is small, so the annular magnet 23
The magnetic attraction force due to the magnetic flux exceeds the biasing force of the spring 26, and the movable core 18 continues to be in the valve open state.

When the coil 20 is energized so as to generate a magnetic flux in the direction opposite to the magnetic flux of the permanent magnet (defined as the opposite direction) from the valve open state of the movable core 18, the fixed core 1
9, a magnetic flux in the opposite direction to the magnetic flux from the ring magnet 23 is generated,
The biasing force of the spring 26 exceeds the magnetic attraction force, and the movable core 18
Is separated from the fixed core 19 and closed. As shown in FIG. 1, when the movable core 18 is closed and the main valve 7 is seated on the valve seat 10, the water passage 6 upstream of the main valve 7 communicates with the main chamber 12 through the orifice hole 47. Then, the water pressures in the upstream water passage 6 and the main chamber 12 become equal, and the force due to the difference in water pressure between the urging force of the spring 11 and the pressure receiving area works to maintain the state in which the main valve 7 is seated on the valve seat 10. It In this state, when a positive current is applied to the coil 20, the movable core 1
8 moves to open the opening of the passage 17, and the passage 15, the sub chamber 16, the passage 17, the second chamber R2, the through hole 33, and the first chamber R1.
And the inside of the main chamber 12 communicates with the downstream water passage 6 of the water turbine 27. Then, the water in the main chamber 12 flows through the passage 15, the sub chamber 16, the passage 17, the second chamber R2, the through hole 33, and the first chamber R1 into the downstream water passage 6 of the water turbine 27, so that the pressure in the main chamber 12 is increased. The pressure becomes lower than the pressure of the upstream water passage 6, and the water pressure of the upstream water passage 6 of the main valve 7 causes the main valve 7 to separate from the valve seat 10 and become a water-passing state.

In this water-flowing state, when a current in the opposite direction is applied to the coil 20, the movable core 18 closes, and water gradually flows into the main chamber 12 through the orifice hole 47, and the main valve 7
Gradually approaches the valve seat 10 and finally becomes a water stop state. In such an operation, dust clogging of the orifice hole 47 is prevented as follows. That is, the water to the orifice hole 47 flows through the circular passage 49 or the slit-shaped passage 50. Out of the water debris passing through the circular passage 49, larger than D ₁ is stopped, and out of the water passing through the slit-like passage 50 larger than L ₁ is stopped and does not flow into the orifice hole 47. Also, dust smaller than D ₁ or L ₁
Smaller dust flows downstream, but orifice hole 4
Since the diameter is smaller than the diameter Do of 7, the orifice hole 47 is not caught. Therefore, the orifice hole 47 is not clogged even if the water flow contains dust larger than that of the orifice hole 47.

Next, the power generation operation will be described. As shown in FIG. 1, when the main valve 7 is closed, the water turbine 27 is used.
There is no pressure difference between the first chamber R1 having the blade portion 32 and the second chamber R2 having no blade portion 32 with respect to the back plate 31 of the water turbine 27, and the water turbine 27 is attached to the slanted portion 35a of the pedestal 35 by its own weight. It has been placed. When the main valve 7 is opened from this state, the water flow from the vortex chamber 44 hits the vane portion 32 of the water wheel 27, and the water wheel 27 separates from the inclined portion 35a of the pedestal 35 and rotates. Due to the centrifugal force that accompanies the swirling of water, water flows from the first chamber R1 to the second chamber R2 through the opening in the outer peripheral portion of the back plate 31 of the water turbine 27, and the pressure in the second chamber R2 rises. Receives thrust force F. As the pressure in the second chamber R2 increases, the turbine 2
Water flows from the second chamber R2 to the first chamber R1 through the through hole 33 of the water turbine 7, and the water turbine 27 moves to the first chamber by the thrust force.
By moving to the chamber R1 side, the opening area of the outer peripheral portion of the back plate 31 of the water turbine 27 becomes smaller.

The opening area of the outer peripheral portion of the predetermined back plate 31, that is, the opening area where the pressure in the first chamber R1 and the pressure in the second chamber R2 are balanced, and the thrust force F is not generated, is maintained. Is kept in a closed state. In addition, the permanent magnet 34 rotates with the rotation of the water wheel 27, and the permanent magnet 34 moves from the permanent magnet 34 to the yoke 4
The flow of the magnetic flux transmitted to 0 changes, and a current flows in the stator coil 42 in a direction to prevent this change, so that power generation is performed.

FIG. 5 shows the result of measurement of clogging at the orifice hole 47. The shapes of the orifices used in this experiment are D ₀ = 0.5 mm, D ₁ = 0.5 mm, D ₂ = 2.0 mm,
D ₃ = 3.0 mm, L ₁ = 0.3 mm, L ₂ = 1.8 mm, L
₃ = 4 mm, 1 type of JIS test dust (silica sand, coarse particles) was used as dust, and 0.1 g of this dust was used daily.
The number of days leading to the clogging of the orifice hole 47 was investigated while continuously operating day and night, with the main valve 7 opened for 4 seconds and closed for 1 second as one cycle, which was introduced upstream of the rotating device. The effect of clogging of dust is that the time from the closing of the movable core 18 to the closing of the main valve 7 (valve closing response) is delayed, and this valve closing response was measured as a performance index. . As a result, in the comparative example (the one without the plate-like protrusion 48), an abnormality due to clogging of dust (valve closing response delay) was recognized in about 5 to 10 days, but in the present example, no abnormality occurred after 30 days or more. There was no

Further, after the test, the orifice hole 4 of the embodiment
When observing the part of 7, the slit-shaped passage 50 has 0.4
3 pieces of dust with a particle size of ~ 0.7mm were caught,
The orifice hole 47 was not clogged. Further, when three slit-shaped passages 50 are caught, the slit-shaped passages 5
Since the passage area of 0 did not reach the passage area of the orifice hole 47 or less, no response delay occurred.

The orifices used in this experiment are the slit-shaped passages 50 each having an area L ₁ × L ₃ × 3 = 0.3 mm × 4 mm ×
3 = 3.6 mm ² and the cross-sectional area of foreign matter is 0.5 mm × 0.5
mm = 0.25 mm ² and the area ratio is 3.6.
mm ² /0.25mm ² ≒ clogged fourteen foreign matter but would become buried slit-like passage 50 finally, actually foreign object shape is uneven, the gap between the contact portion of the fourteen foreign matter Since it is quite large, after all, the slit-shaped passage 50
It is considered that the passage area of the orifice hole 47 does not fall below the passage area of the orifice hole 47 (π × (0.5) ² /4=0.196 mm ^{2 in} this example). However, it is possible to eliminate clogging of the orifice.

As described above, in the pilot valve of this embodiment, the plate-like protrusion 48 made of the same material as the diaphragm plate 8 is provided on the upstream surface of the diaphragm plate 8 (orifice plate).
A passage (projection for forming a passage) is integrally formed, and the projection 48 reaches the orifice hole 47, and the minimum clearance is equal to or smaller than the orifice diameter and the area is larger than the area of the orifice hole (circular passage 49, slit-like passage 50). Was formed. As a result, when the water containing dust flows from the upstream side of the diaphragm plate 8, the protrusion 48 prevents the dust from entering the orifice hole 47 and prevents the orifice hole 47 from being blocked. In this way, the number of parts can be reduced by using the projection 48 instead of the strainer having a small mesh size. Moreover, the passages 49 and 50 can be integrally formed at the time of forming the diaphragm plate 8, resulting in low cost. Further, even if the mesh size of the strainer 13 arranged in the water channel 6 is not reduced, the clogging of the orifice hole 47 is prevented, and the maintenance of the strainer 13 and the maintenance of the orifice can be greatly reduced, and the usability can be improved.

That is, in the case where the plate-like projection 48 is not provided, unless the mesh (opening size) of the strainer 13 is set to about 1/2 to 1/3 of the orifice diameter, the orifice hole 4
It was found by experiments that the clogging of No. 7 could not be prevented reliably. This is because variations in mesh and dust having an elongated shape bridge the orifice holes 47 to block the passage. On the other hand, since the closing speed of the main valve 7 cannot be increased from the viewpoint of preventing water hammer, an orifice diameter of about 0.5 mm is often used. Therefore, the opening dimension of the strainer 13 that surely prevents clogging at the orifice needs to be 0.2 mm or less (65 mesh or more). When the opening dimension of the strainer 13 is 0.2 mm or less, the strainer 13 part The water resistance of the strainer becomes high, and the strainer 13 is frequently clogged with dust, which requires labor for maintenance and is difficult to use. However, in this embodiment, the number of meshes of the strainer 13 may be "30" and the opening size may be as large as about 0.5 mm, so that maintenance due to clogging of the strainer 13 can be minimized.

The present invention is not limited to the above-described embodiment. For example, as shown in FIGS. 6, 7 and 8, a bottom groove passage 51 communicating with the orifice hole 47 is provided at the bottom of the slit passage 50. It may be provided. In this case, in addition to the slit-shaped passage 50 and the circular passage 49, there is the bottom groove passage 51, so that a margin can be taken against clogging of foreign matter.
Further, as shown in FIGS. 9 and 10, the diaphragm plate 8
A protrusion 52 is formed on the inner wall of the recess 46 to form a plate-like protrusion 48.
Alternatively, the plate-like protrusion 48 may be provided so as to project from one surface of the diaphragm plate 8 to the upstream side.

[0030]

As described in detail above, according to the present invention,
Since it is not necessary to provide a strainer for preventing clogging of the orifice hole on the upstream side of the orifice plate, the number of parts can be reduced, and foreign matter clogging in the orifice hole can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of an automatic faucet with a power generator according to an embodiment.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

4 is a view on arrow C in FIG. 3. FIG.

FIG. 5 is a diagram showing measurement results of test days and valve closing response.

FIG. 6 is a view showing a diaphragm plate of another example.

7 is a cross-sectional view taken along line EE of FIG.

FIG. 8 is a view on arrow G in FIG.

FIG. 9 is a view showing a diaphragm plate of another example.

10 is a cross-sectional view taken along line HH of FIG.

[Explanation of symbols]

 8 diaphragm plate as orifice plate 12 main chamber forming fluid passage 15 passage forming fluid passage 16 sub-chamber forming fluid passage 17 passage forming fluid passage 18 movable core forming solenoid valve 19 forming solenoid valve Fixed core 20 Coil constituting a solenoid valve 21 Yoke constituting a solenoid valve 22 First ring constituting a solenoid valve 23 Annular magnet constituting a solenoid valve 24 Second ring constituting a solenoid valve 25 Cylinder constituting a solenoid valve -Shaped cylinder 26 Compression coil spring 47 that constitutes an electromagnetic valve 47 Orifice hole 48 Plate-shaped protrusion as a passage-forming protrusion 49 Circular passage 50 Slit-shaped passage

Claims (1)

[Scope of utility model registration request] 1. A pilot valve provided with an orifice plate having an orifice hole arranged in the middle of a fluid passage, and a solenoid valve arranged on the downstream side of the orifice in the fluid passage and opening and closing the passage, A passage forming protrusion made of the same material as the orifice plate is integrally formed on the upstream surface of the orifice plate, and the passage forming protrusion reaches the orifice hole, and the minimum gap is equal to or smaller than the orifice diameter and the area is larger than the area of the orifice hole. A pilot valve characterized by forming a large passage.