JPH0633270Y2 - Automatic valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a valve for adjusting the inflow and outflow of a fluid, and more particularly to an automatic valve whose opening / closing operation is performed by the magnetic force of a permanent magnet.

[Conventional technology]

As shown in FIG. 6, this kind of automatic valve has a small diameter formed by forming a valve body 2 for closing the fluid outflow port 1A at the front end and laminating a plurality of ring-shaped magnets 3, 3 ... At the rear end. The valve shaft 4 to which the multilayer cylindrical magnet MS is attached is slidably accommodated in the valve chamber 5.

Then, outside the valve chamber 5, the ring-shaped magnets 3, 3 are formed.
, And a large-diameter multi-layered cylindrical magnet ML formed by stacking a plurality of ring-shaped magnets 6, 6 ...
Is provided so as to be slidable along the axial direction of the valve shaft 4 and provided with a cylinder 8 for sliding the piston 7 composed of the cylindrical magnet ML in the valve opening direction and the valve closing direction by the pressure of the compressed gas. (See Japanese Utility Model Laid-Open No. 60-8582).

The cylinder 8 is provided with compressed gas outflow inlets 9A and 9B on both front and rear sides with the piston 7 sandwiched therebetween, and the piston 7 is driven by the pressure of the compressed gas alternately supplied from these outflow inlets 9A and 9B. Is made.

Then, when the piston 7 slides in the opening direction or the closing direction of the valve, the magnetic force of the multilayer cylindrical magnet ML forming the piston 7 causes the valve shaft 4 to which the multilayer cylindrical magnet MS is attached in the valve chamber 5. The valve body 2 is operated by sliding back and forth, and the fluid inlet / outlet port 1A is opened / closed.

In this way, the valve shaft 4 does not penetrate the side wall of the valve chamber 5 and does not project to the outside, but slides while being accommodated in the valve chamber 5 to operate the valve body 2 attached to its tip. With such a configuration, the sealability inside the valve chamber 5 formed between the two outflow ports 1A and 1B becomes extremely good.

[Problems to be solved by the invention]

However, when this type of automatic valve is used as a color changing valve of a multicolor coating apparatus, for example, the valve body 2 in the closed state receives the reverse pressure of the paint acting from the outflow inlet 1A side and separates from the valve seat 10. There was a fear.

That is, in the color change valve, one outflow port 1B is connected to a paint supply source of a specific color, and the other outflow port 1A is connected to a manifold connected to a coating machine via a paint hose. Is also connected to another color change valve that supplies a different color paint. Therefore, if the magnetic attraction between the cylindrical magnets MS and ML that closes the color change valve is weak,
The valve body 2 that closes the outflow inlet 1A under the pressure of the different color paint supplied from the other color changing valve into the manifold separates from the valve seat 10, and the different color paint enters the valve chamber 5 and the paint There was a risk of paint failure due to color mixing.

Therefore, in the present invention, the magnetic attraction force generated between the cylindrical magnets MS and ML can be increased without increasing the size of the cylindrical magnets MS and ML, and the valve body 2 to which the back pressure acts can be maintained in a completely closed state. The purpose is to provide an automatic valve.

[Means for solving problems]

In order to achieve this object, the present invention provides a valve in which a valve body for closing a fluid inflow / outflow port is formed at a front end, and a small-diameter multi-layered cylindrical magnet formed by laminating a plurality of ring-shaped magnets is attached at a rear end. A shaft is slidably accommodated in the valve chamber, and a large-diameter multi-layer formed by stacking a plurality of ring-shaped magnets concentrically arranged with different polarities from the ring-shaped magnets outside the valve chamber. -Shaped cylindrical magnet is slidably arranged along the axial direction of the valve shaft, and an automatic cylinder provided for sliding the piston composed of the cylindrical magnet in the valve opening direction by the pressure of compressed gas is provided. In the valve, the outer diameter of the small-diameter multilayer cylindrical magnet attached to the valve shaft is selected to be smaller than the inner diameter of the valve chamber, and the cylindrical magnet and the peripheral surface of the valve shaft and the inner wall of the valve chamber are A passage is formed between the A plurality of ring-shaped magnets, each of which has a plurality of multi-layered cylindrical magnets, are laminated with the same poles facing each other and are laminated at the both ends of the passage. At the time of closing, the ring-shaped magnets forming the large-diameter multi-layered cylindrical magnets are positioned in a state of being displaced in the valve closing direction with respect to the different-polarity ring-shaped magnets forming the small-diameter multi-layered cylindrical magnet. It is characterized by being made as follows.

[Action]

According to the present invention, a piston composed of a large-diameter multi-layered cylindrical magnet is slid in the opening direction of the valve to form a valve shaft at the front end and a small-diameter multi-layered cylindrical magnet at the rear end. When the valve is driven in the opening direction, the fluid flows in and out through a passage formed between the peripheral surface of the small-diameter multi-layered cylindrical magnet and the valve shaft and the inner wall of the valve chamber that houses them. It is possible to reliably wash and remove the paint remaining in the valve chamber by supplying the cleaning solvent after supplying the paint. Also, a small-diameter multi-layered cylindrical magnet attached to the rear end of the valve shaft slidably accommodated in the valve chamber and a large-diameter multi-layered magnet arranged outside the valve chamber and slidable in the axial direction of the valve shaft. Each of the cylindrical magnets has a structure in which a plurality of ring-shaped magnets are laminated with the same poles facing each other, so that the magnetic force of each becomes extremely strong, and there is a passage through which a fluid passes. However, a strong magnetic attraction force acts in the meantime.

That is, it is well known that when the different poles of a magnet are brought into contact with each other, the magnetic poles on the contact surface disappear, but even if they do not come into contact, if the different poles are stacked in a state of being extremely close to each other, one magnet Since the magnetic force lines emitted from the N pole of the other magnet are concentrated toward the S pole of the other magnet, the magnetic attraction force acting between the N pole and the S pole of the third magnet opposed thereto becomes extremely weak. . On the other hand, like the two multi-layered cylindrical magnets according to the present invention, when each of them has a structure in which a plurality of ring-shaped magnets are laminated with the same poles facing each other, one multi-layered cylindrical magnet is formed. A large number of magnetic force lines are generated from the two N poles of each ring magnet facing each other, and the magnetic force lines are concentrated toward the S pole of the other multi-layered cylindrical magnet that is close to and facing each of these N poles. Therefore, the magnetic attraction force acting between the large-diameter multilayer cylindrical magnet and the small-diameter multilayer cylindrical magnet becomes extremely strong.

When the valve is closed, the ring-shaped magnets forming the large-diameter multilayer cylindrical magnet are displaced in the valve closing direction with respect to the different-polarity ring-shaped magnets forming the small-diameter multilayer cylindrical magnet. In this state, the magnetic attraction force acting between the two causes the valve shaft having the small-diameter multi-layered cylindrical magnet attached thereto to be urged in the valve closing direction. The body can be kept completely closed against the counterpressure of the fluid acting on it.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is an overall sectional view showing an example of an automatic valve according to the present invention, and FIG. 2 is an enlarged sectional view showing an arrangement state of ring-shaped magnets forming a large-diameter and a small-diameter multilayer cylindrical magnet, and FIG. FIG. 4 is a sectional view of a valve shaft.

The parts corresponding to those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the present example, the ring-shaped magnets 3, 3 ... Forming the small-diameter multilayer cylindrical magnet MS and the ring-shaped magnets 6, 6 ... Forming the large-diameter multilayer cylindrical magnet ML are , Second
As shown in the figure, the ring-shaped magnets are laminated so that the adjacent poles have the same poles facing each other, and when the valve is closed, each ring-shaped magnet forms a large-diameter multilayer cylindrical magnet ML as shown in FIG. Are arranged so as to be displaced in the valve closing direction with respect to the ring-shaped magnets 3, 3 ... Of different polarities forming the small-diameter multi-layer cylindrical magnet ML.

The ring-shaped magnets 3, 3 ... Are respectively fitted between the ring-shaped yokes 11, 11 having the same diameter as the ring-shaped magnets, and are fitted onto the bolts 12 planted at the rear end of the valve shaft 4, and screwed with the bolts 12. The nuts 13 are fastened in a state of being integrally laminated against the repulsive force between the N poles or between the S poles acting between the adjacent magnets 3, 3.

Further, the ring-shaped magnets 6, 6 ... Are fitted in the cylindrical piston 7 by being sandwiched between the ring-shaped yokes 14, 14 having the same diameter as that of the ring-shaped magnets 6, 6, and are fitted on the inner wall of the piston 7. C
The shape retaining ring 15 is fastened in a integrally laminated state against the repulsive force between the same poles acting between the adjacent magnets 6 and 6.

The outer diameter of the cylindrical magnet MS attached to the valve shaft 4 is equal to the outflow port 1
The valve seat 10 forming A is selected to be smaller than the inner diameter of the valve chamber 5 including the hollow body 16 having one end attached to the hollow body 16 and the cylindrical tube 18 made of aluminum attached to the other end. Peripheral surface of magnet MS and valve chamber 5
A passage 19 through which a fluid passes is formed between the inner wall and the inner wall.

Further, as shown in FIG. 3, the valve shaft 4 has such a shape that a wide passage 19 can be secured only by chamfering the corners of a metal rectangular bar forming the main body by lathing.

That is, the multilayer cylindrical magnet MS attached to the rear end of the valve shaft 4 is secured to the valve chamber 5 while ensuring the fluid passage 19 in the valve chamber 5.
In order to locate it at the center of the above, the peripheral surface of the valve shaft 4 must be in sliding contact with the inner wall of the valve chamber 5, and a part of the peripheral surface must be separated from the inner wall of the valve chamber 5. For that purpose, it is conceivable to use, for example, a metal round bar as the valve shaft 4 and form a plurality of recessed grooves on the circumferential surface along the longitudinal direction, but in this case, the recessed grooves are cut. There is a problem that the cost of grooving increases. On the other hand, as shown in FIG. 3, a simple lathe process in which the corners of the square rod are chamfered according to the inner diameter of the valve chamber 5 results in a very low processing cost.

In the figure, 20 is a flat head screw for fixing the valve seat 10 to the hollow body 16, and 21 is a flat head screw for fixing the cylindrical tube 18 to the hollow body 16.

Further, the valve body 2 formed by embedding the plate-shaped packing 22 is formed on the tip end surface of the valve shaft 4, and the surface of the plate-shaped packing 22 is closed when the valve body 2 is in contact with the valve seat 10. A ridge 10 formed on the valve seat 10 along the periphery of the outflow port 1A
It can be pressed against a. In this way, the plate-like packing 22 of the valve body 2 that is in contact with the valve seat 10 is
If it is embedded in the front end surface of the plate, excessive pressure is not applied to the plate-like packing 22, so that it is possible to use a flexible rubber packing to improve the sealing property and to prevent wear and damage. It is eased and durability is also improved.

Next, the cylindrical tube 18 fixed to the hollow body 16 with countersunk screws 21 is slidably fitted with the piston 7 fitted with the large-diameter multilayer cylindrical magnet ML. In the piston 7, a pair of wear rings 23, 2 which slidably contact the outer peripheral surface of the cylindrical tube 18 on both sides of the cylindrical magnet ML with the cylindrical magnet ML interposed therebetween.
3 is fitted, and the cylindrical magnet ML is formed by sliding the piston 7.
Wear is prevented.

The piston 7 is provided with a spring 24 for urging the piston 7 in the valve closing direction.
A cylindrical cover 25 that serves as a barrel is covered. The cylindrical cover 25 is formed with a collar-shaped portion 25 a into which the end of the cylindrical tube 18 is fitted, on the rear end side thereof.
a is locked by a connection 26 screwed to the cylindrical tube 18 and is fastened to the hollow body 16 so as to be fitted onto the hollow body 16. Therefore, when performing maintenance and inspection of the automatic valve or parts replacement work, first, the connection 26 screwed to the cylindrical tube 18 is simply removed, and then the cylindrical cover 25 fitted on the hollow body 16 is simply removed. ,
All parts can be taken out easily.

Further, the collar-shaped portion 25a has an exhaust hole 27 for discharging the gas in the cylinder 8 when a compressed gas for driving the piston 7 is supplied from an outflow port 9 formed in the hollow body 16.
Has been drilled.

As shown in the sectional view of FIG. 1 and the plan view of FIG. 4, the exhaust hole 27 is formed along the inner peripheral surface of the collar-shaped portion 25a that closely adheres to the outer peripheral surface of the cylindrical tube 18. The bypass passage 27a formed of a concave groove formed in a ring shape, and the bypass passage 2
An exhaust passage 27b formed of a hole penetrating outside the cylinder 8 from the inside of the concave groove of 7a toward the outer peripheral surface of the cylindrical cover 25;
It is formed of an exhaust passage 27c formed of a hole that penetrates into the cylinder 8 in the direction opposite to the exhaust passage 27b with the cylindrical tube 18 interposed between the concave groove of the bypass passage 27a. Then, when the piston 7 is slid in the valve opening direction against the elasticity of the spring 24 by the compressed gas supplied from the outflow / outlet port 9, the gas in the cylinder 8 pressurized by the piston 7 is The exhaust passage 27c opening into the cylinder 8 is discharged to the outside of the cylinder 8 through a bypass passage 27a bent in an annular shape and the exhaust passage 27b.

In this way, the exhaust hole 27 has the exhaust passage 27c opening inside the cylinder 8 and the exhaust passage 27b opening outside the cylinder 8.
If the shape is such that the and are communicated with each other via the bypass passage 27a that is bent in an annular shape, when the cleaning solvent is sprayed on the automatic valve to wash off the dirt such as paint adhered to the surface, the sprayed solvent is It is possible to surely prevent the harmful effect that the rubber packing or the like enters the inside of the housing 8 and damages the rubber packing or the like.

That is, the solvent that enters from the outside of the cylinder 8 through the exhaust passage 27b is obstructed by the annular bypass passage 27a,
Since it is not possible to bypass the passage 27a to reach the exhaust passage 27c, there is no possibility that the packing such as the O-ring provided in the cylinder 8 will be damaged by the solvent.

Further, the exhaust hole 27 first forms a detour passage 27a by cutting a concave groove on the inner peripheral surface of the collar-shaped portion 25a, and then penetrates from the outer peripheral surface of the collar-shaped portion 25a toward the detour passage 27a. The exhaust passage 27b is bored, and a hole of a certain length is opened from the inside of the bypass passage 27a in the direction opposite to the exhaust passage 27b, and a hole communicating with this hole is opened from the inside of the cylinder 8 to form the exhaust passage 27c. By drilling, it can be processed very easily.

Reference numeral 28 denotes a holder for attaching the automatic valve to a manifold or the like of the color changing device, which is sandwiched between the hollow body 16 and the valve seat 10 and fixed together with the valve seat 10 to the hollow body 16 with a countersunk screw 20. Has been done.

The connection 26 also forms an outflow port 1B for the paint supplied from the paint supply source.

The above is an example of the configuration of the automatic valve according to the present invention. Next, its function and effect will be described.

First, in the present invention, the ring-shaped magnets 3, 3 ... Forming the multilayer cylindrical magnet MS and the ring-shaped magnets 6, 6 ... Forming the multilayer cylindrical magnet ML are as shown in FIG. Since the adjacent ring-shaped magnets and the adjacent N-poles or the S-poles are laminated so as to face each other, for example, a large number of magnetic field lines generated from the two N-poles of the ring-shaped magnets 3 and 3 facing each other are concerned. A strong magnetic attractive force acts between the multi-layered cylindrical magnets MS and ML by concentrating toward the N poles of the ring-shaped magnets 3 and 3 toward the S poles of the ring-shaped magnets 6 and 6 facing each other through the cylindrical tube 18. Becomes

In addition, as shown in FIG. 1, when the valve body 2 formed at the tip of the valve shaft 4 is in contact with the valve seat 10, the valve 24 is in a closed state. Multi-layered cylindrical magnet M biased in the closing direction
The ring-shaped magnets 6, 6 ... Of L are displaced in the valve closing direction with respect to the ring-shaped magnets 3, 3 ... Of different polarities forming the multilayer cylindrical magnet MS attached to the rear end of the valve shaft 4. Since they are located in the closed state, the cylindrical magnet M is generated by the magnetic attraction force acting between these ring-shaped magnets 6, 6 ... And 3, 3.
The valve shaft 4 to which S is attached is strongly urged in the valve closing direction.

As a result, the valve body 2 formed at the tip of the valve shaft 4 is maintained in a completely closed state against the reverse pressure of the fluid acting from the outflow inlet 1A side.

Therefore, when the automatic valve according to the present invention is used as a color changing valve of a multicolor coating device, the valve body 2 has the outlet port 1A.
The adverse effect of receiving the pressure of the different color paint acting from the side and floating away from the valve seat 10 and causing the different color paint to enter the valve chamber 5 to cause color mixing of the paint is reliably prevented.

Next, when opening the automatic valve, the compressed gas is supplied from the outflow port 9 formed in the hollow body 16, and the pressure thereof causes the piston 7 in which the cylindrical magnet ML is fitted to resist the elasticity of the spring 24. Slide in the valve opening direction.

As a result, the cylindrical magnet MS fitted to the piston 7 is attracted to the cylindrical magnet MS by a magnetic attraction force.
Following this, the valve body 2 formed at the tip of the valve shaft 4 slides away from the valve seat 10 by sliding in the valve opening direction, and the outflow inlet 1A is opened.

Then, the fluid such as paint flowing from the outflow port 1B flows out from the outflow port 1A through the passage 19 formed in the valve chamber 5.

When the piston 7 is slid in the valve opening direction, the gas in the cylinder 8 is pressed by the piston 7 and discharged from the exhaust hole 27 to the outside.

When closing the automatic valve, the piston 7 is automatically slid in the valve closing direction due to the elasticity of the spring 24 only by stopping the supply of the compressed gas from the outflow / outlet port 9 of FIG. Return to the state.

Also, the valve chamber 5 of the automatic valve used as a color changing valve.
When cleaning the inside, the valve is opened and the cleaning solvent flowing in from the outflow port 1B is passed through the passage 19 in the valve chamber 5.
Through the inlet / outlet port 1A. As a result, the paint remaining on the inner wall of the valve chamber 5, the valve shaft 4 and the surface of the cylindrical magnet MS is completely washed away without causing color residue.

In addition, in FIG. 1, the case where the automatic valve is a two-way valve has been described, but the present invention is not limited to this and may be a three-way valve as shown in FIG.

That is, FIG. 5 is a cross-sectional view showing another embodiment of the automatic valve according to the present invention, which has another outflow port 1C in addition to the outflow ports 1A and 1B.

The outflow port 1C is provided in the hollow body 16 and is connected to, for example, a paint supply source. When the automatic valve is in the closed state as shown in FIG. 5, the outflow port 1C is supplied from the paint supply source and flows in from the outflow port 1C. The paint that flows into the passage 19 in the valve chamber 5
Flowing toward the outflow port 1B formed on the opposite side of the outflow port 1A, flowing out from the outflow port 1B and returning to the paint supply source again.

Further, the valve shaft 4 has the outflow inlets 1A and 1B at both front and rear ends thereof.
Valve bodies 2 and 2'for alternately closing the valve are formed. The valve body 2 ′ has a plate-like packing 2 similar to the valve body 2 on the end surface of a nut 13 screwed with a bolt 12 protruding from the rear end of the valve shaft 4.
2'is buried.

As a result, when the automatic valve is opened, the outflow port 1B, which has recirculated the paint flowing into the valve chamber 5 from the outflow port 1C to the paint supply source, is closed by the valve body 2 ', and at the same time,
The outflow port 1A closed by the valve body 2 is opened, and the paint flowing into the valve chamber 5 from the outflow port 1C flows out from the outflow port 1A and is supplied to the coating machine.

Since the other parts are common to those in FIG. 1, the same reference numerals are given and detailed description thereof is omitted.

[Effect of device]

As described above, according to the present invention, a fluid passage is formed between the circumferential surface of the valve shaft and the small-diameter multilayer cylindrical magnet attached to the valve shaft and the inner wall of the valve chamber that houses them. ,
Since fluid outflow and inflow ports are formed on both ends of the passage, when used as a color change valve for paint, for example, the paint remaining on the inner wall of the valve chamber, the valve shaft and the surface of the cylindrical magnet can be washed with a solvent. Can be removed without leaving any color. Also, a small-diameter multi-layered cylindrical magnet attached to the rear end of the valve shaft slidably accommodated in the valve chamber, and a large-diameter multi-layered cylinder that slides the valve shaft from outside the valve chamber by the magnetic force attracting the cylindrical magnet. Since each of the magnets has a structure in which a plurality of ring-shaped magnets are laminated with the same poles facing each other, the magnetic attraction force acting between the two becomes extremely strong. When the valve is closed, the ring-shaped magnets forming the large-diameter multilayer cylindrical magnet are displaced in the valve closing direction with respect to the different-polarity ring-shaped magnets forming the small-diameter multilayer cylindrical magnet. In this state, the valve shaft to which the small-diameter multilayer cylindrical magnet is attached is urged in the valve closing direction by the magnetic attraction force acting between the two in this state. Therefore, even if there is a fluid passage between the large-diameter multi-layered cylindrical magnet and the small-diameter multi-layered cylindrical magnet, the valve element formed at the tip of the valve shaft with the small-diameter multi-layered cylindrical magnet attached It has a very excellent effect that it can be maintained in a completely closed state against the reverse pressure of the fluid acting on it.

[Brief description of drawings]

FIG. 1 is an overall sectional view showing an example of an automatic valve according to the present invention, and FIG. 2 is an enlarged sectional view showing an array state of ring-shaped magnets forming a large-diameter multilayer cylindrical magnet and a small-diameter multilayer cylindrical magnet. FIG. 3 is a sectional view of the valve shaft, FIG. 4 is a plan view showing the shape of an exhaust hole provided in a cylindrical cover forming a cylinder, and FIG. 5 is another embodiment of the automatic valve according to the present invention. FIG. 6 is a sectional view of the whole, and FIG. 6 is a sectional view showing a conventional automatic valve. DESCRIPTION OF SYMBOLS 1A, 1B, 1C ... Inflow / outflow port of fluid, 2 ... Valve body, 3 ... Ring magnet, 4 ... Valve shaft, 5 ... Valve chamber, 6 ... Ring magnet,
MS ... Small diameter multi-layered cylindrical magnet, ML ... Large diameter multi-layered cylindrical magnet.

Claims (1)

[Scope of utility model registration request] 1. A valve body (2) for closing a fluid inflow / outflow port is formed at a front end, and a small-diameter multi-layered cylindrical magnet (MS) having a plurality of ring-shaped magnets (3) stacked at a rear end is attached. The valve shaft (4) is slidably accommodated in the valve chamber (5) and is concentrically arranged outside the valve chamber (5) with the polarities different from those of the ring magnets (3). A multi-layered cylindrical magnet (ML) having a large diameter formed by laminating a plurality of ring-shaped magnets (6) is slidably arranged along the axial direction of the valve shaft (4), and
In an automatic valve provided with a cylinder (8) that slides a piston (7) made of the cylindrical magnet (ML) in the valve opening direction by the pressure of compressed gas, a small-diameter valve attached to the valve shaft (4). The outer diameter of the multilayer cylindrical magnet (MS) is selected to be smaller than the inner diameter of the valve chamber (5),
A passage (19) through which a fluid passes is formed between the cylindrical magnet (MS) and the peripheral surface of the valve shaft (4) and the inner wall of the valve chamber (5), and both ends of the passage (19) are formed. Fluid outflow port (1A, 1
B, 1C) is formed, and a plurality of ring-shaped magnets (3, 6) forming each of the multi-layered cylindrical magnets (MS, ML) are laminated with their adjacent poles facing each other. Along with
When the valve is closed, each ring-shaped magnet (6) forming the large-diameter multi-layered cylindrical magnet (ML) is
An automatic valve, characterized in that it is positioned so as to be displaced in the valve closing direction with respect to each ring-shaped magnet (3) of different polarity forming (S).