JP2683777B2 - solenoid valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a solenoid valve used for fluid flow rate control, flow path switching, and the like, and in particular, an opening / closing valve of a refrigeration circuit, a multi-circuit valve, an intermediate bypass valve, or the like. Relates to a solenoid valve suitable for.

(Prior Art) Conventionally, this type of solenoid valve has been disclosed by Japanese Utility Model Publication No. 57-117476, Japanese Utility Model Publication No. 57-83956, etc., by its attractive force when the coil is energized. Generally, a reciprocating type using a plunger that pulls the plunger against the force of a spring and opens / closes or switches the valve through various actuating members is used.

However, in this reciprocating type, when the plunger is sucked, the end portion of the plunger collides with the stopper to generate noise, and further, there is a drawback that the life of the product is shortened due to repeated collisions. In particular, as the suction force is increased in order to increase the operating force, the collision noise becomes louder, which is unsuitable for use in equipment such as air conditioners and refrigerators that require quietness.

On the other hand, in order to reduce this collision sound, for example,
As disclosed in Japanese Laid-Open Patent Publication No. 59-1416, it has been attempted to use a rotary type in which a movable body operated by a coil does not move linearly but rotates.

However, in these rotary types, sliding noise is generated although the collision noise is reduced, and like the rotary solenoid and the motor, the rotary type rotates around the central axis.
At that time, since the actuating member operates in the direction of cutting the magnetic flux, there is a drawback that the actuating force is not sufficiently strong even if the magnetic flux is increased. Further, these rotary types have a drawback in that they make a kind of motor, require a rotary shaft, and have a weak magnetic power gap because the magnetic path gap between the rotor and the stator is constant.

(Problems to be Solved by the Invention) As described above, the reciprocating valve has a drawback that noise is generated and the product life is shortened, and the rotary valve has a reduction in operating force and the necessity of the rotating shaft. There was the drawback of creating the need to apply thrust forces to the actuating members.

The present invention overcomes the above-mentioned drawbacks, reduces noise, prolongs product life, solves the problems of improving operating force and eliminating the need for a rotary shaft.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a coil inside a housing made of a magnetic material, and hangs a cylinder below the coil, and a lower end of the cylinder. A valve body having an inlet, an outlet, and a valve seat surface is fixed to a portion to form a valve chamber, and a valve body provided with a sliding portion facing the valve seat surface is made of a magnetic material. An annular movable body is rotatably arranged, a magnetic member is fixed inside the housing, and a permanent magnet is provided at a position apart from the magnetic member and the cylindrical body in the circumferential direction, and the permanent magnet is movable. The polarity of the surface facing the body is the same as the polarity generated on the outer circumference of the movable body when the coil is energized, and the permanent magnet attracts and holds the movable body when the coil is not energized, and the outer circumference of the movable body is energized. The magnetic member repels due to the polarity generated in the In this case, the valve body opens and closes the inflow port or the outflow port.

(Operation) Since the solenoid valve of the present invention is configured as described above, when the coil is energized, the generated magnetic flux forms a closed loop by being guided to the magnetic member that guides the magnetic flux from the movable body and to the housing. As a result, when the coil is de-energized, the movable body is attracted and held by the permanent magnet, and when the coil is energized, the movable body rolls in the cylindrical body. At that time, the permanent magnet acts to repel the movable body. The valve body provided on the movable body is held in an arbitrary open or closed position by the movement of the body. The moving direction of the movable body is almost in the direction of the magnetic flux passing through the movable body.

(Embodiment) A first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, a housing 1 made of a magnetic material.
A coil 2 is provided inside, and a set screw 4 made of a magnetic material is provided so as to penetrate from the upper surface 3 of the housing to the center of the coil. The set screw 4 is screwed into the female screw 6 above the upper lid 5 made of a magnetic member provided on the lower portion of the coil 2. A protrusion 7 is provided below the upper lid 5.

An outer wall 10 is provided on one side of the housing 1, and an arcuate magnetic member is provided between the outer wall 10 and a cylindrical body 11 fixed to the outer periphery of the upper lid 5.
Secure 12 to outer wall 10. Below the cylinder 11 is the valve body.
A valve chamber 30 is formed by fixing 13 and a valve seat surface 14 of the valve body 13 is provided with an inflow port 16 to which an inflow pipe (not shown) is connected and an outflow port 18 to which an outflow pipe 17 is fixed. A valve body 20 is slidably provided on the valve seat surface 14, and an annular sliding portion 21 facing the valve seat surface 14 of the valve body 13 is provided below the valve body 20. The sliding portion 21 is an annular valve having a predetermined width that completely covers at least the outlet 18. The valve body 20 is fixed below the movable body 22 which is annular and made of a magnetic material, and therefore moves together with the movable body 22.
When fixing this, an annular groove provided on the outer periphery of the upper part of the valve body 20
You may comprise so that the movable body 22 may be fitted in 33. At that time, the valve body 20 and the movable body 22 are movable in the axial direction and fixed in the radial direction. The upper surface of the movable body 22 opposes a sliding member 24 made of synthetic resin or the like fixed to the lower surface of the upper lid 5.

On the other hand, a permanent magnet 19 is fixed to the outer circumference of the cylindrical body 11. The polarity of the permanent magnet 19 is the same as the polarity generated on the outer circumference of the movable body 22 when the coil 2 is energized.
So that it occurs on the surface opposite to.

A hole 25 is provided in the center of the valve body 20, and one end is a hole inside the hole 25.
A spring 28 for supporting a ball 29 is provided at the other end, which is supported by abutting against a bottom wall 26 of 25. The spring 28 is set in a compressed state, so that the ball 29 is constantly in pressure contact with the bottom surface of the opposed protruding portion 7 to prevent the valve body 20 from rising.

In the state in which the annular movable body 22 is attracted and held by the permanent magnet 19, its center O ₂ is the center of the coil 2, the housing 1, the upper lid 5, the valve body 13 and the like, as shown in FIG. O ₁
And eccentric. On the other hand, when the coil 2 is not energized, the movable body 22 comes into contact with the inner surface of the tubular body 11 at a point P, and as shown in FIG.
The position of the contact point Q with the inner surface of the is about 90 in the illustrated embodiment.
It is staggered. The positions of the contact points P and Q can be arbitrarily set according to various conditions such as the positional relationship of the valves. In addition,
If the positions of the two are displaced by 180 degrees, a dead center is given to the rolling of the movable body 22, which is not preferable.

In this embodiment, when the coil 2 is not energized, the movable body
22 is held in the position shown in FIG. That is, the movable body
The permanent magnet 19 is attracted to the permanent magnet 19, and is held in contact with the cylindrical body 11 at a point P. In this state, the valve body fixed to the movable body 22
The sliding portion 21 of 20 has an inlet 16 as shown by a broken line in the figure.
Also, the outlet 18 is not covered, and both openings communicate with each other via the valve chamber 30. Therefore, the inflow pipe and the outflow pipe 17 not shown
Communicate with each other and the fluid flows freely.

Next, when the coil 2 is energized, as shown in FIG. 3, the magnetic flux generated in the coil 2 is stopped again via the housing 1 having the set screw 4, the upper lid 5, the protruding portion 7, the movable body 22, and the magnetic member 12, respectively. Form a closed loop back to the screw 4. Due to this magnetic flux, the movable body moves toward the magnetic member 12 from a position away from the magnetic member 12 when the coil 2 is in an emergency state. The movement is performed by the outer circumference of the movable body 22 rolling on the inner circumference of the cylindrical body 11. At that time, the central magnetic flux of the coil 2 excites the protrusion 7 to the N pole, and the magnetic flux returning from the housing 1 to the coil excites the magnetic member 12 to the S pole. Therefore, as a result of exciting the surface of the movable body 22 facing the protruding portion 7 to the S pole and the surface facing the magnetic member 12 to the N pole, the inner peripheral surface of the movable body 22 becomes the S pole and the outer peripheral surface thereof becomes the N pole. Become a pole. Note that this polarity can be reversed depending on the direction of energization of the coil, and in that case, the permanent magnets of the opposite polarities are naturally used.

When the movable body 22 is given such a polarity, the polarity of the permanent magnet 19 provided on the outer periphery of the cylindrical body 11 is changed to the movable body 22 of the permanent magnet.
Since it is installed so that the polarity of the surface facing to the same polarity as the polarity generated on the outer periphery of the movable body 22, the movable body 22 generates a force that repels the permanent magnet 19 at the same time as energizing the coil, and it is quick and It is strongly attracted to the magnetic member 12 side. Finally, the movable body 22 is held at a position corresponding to the point Q at the center position of the magnetic member 12 in the width direction, as shown in FIG. In this state, the sliding portion 21 of the valve body 20 fixed to the movable body 22 covers the outflow port 18 as shown by the broken line in the figure, and the fluid is shut off.

At the time of this movement, the spring 28 compressed and arranged in the hole 25 of the valve body 20 moves together with the valve body 20.
The ball 29 provided between and slides or rolls on the bottom surface 27 by point contact. Therefore, the untwisting action of the spring 28 due to the movement of the valve body 20 is extremely reduced, and the change in spring force is prevented. Further, the upward movement of the movable body 22 is guided while being blocked by the sliding member 24 made of a synthetic resin or the like and smoothly slides, so that the movable body is stably and smoothly moved.

When the valve body 20 and the movable body 22 are slidable in the axial direction, the distance between the valve seat surface 14 and the sliding member 24 is larger than the combined height of the valve body 20 and the movable body 22. In some cases, even if the intervals are not uniform, the sliding portion 21 is reliably pressed against the valve seat surface 14 by the spring 28. Further, since the movable body 22 is eccentrically moved in the axial bundle direction, the magnetic resistance is reduced and a strong actuating force is provided.

In the above embodiment, the valve is opened when the coil is not energized, and is closed when the coil is energized.
The configuration can be changed so that the valve opens when the power is turned on.
For example, if the positions of the fluid outflow hole 16 and the fluid outflow hole 18 are provided as shown in FIG. 4, the movable body 22 moves toward the magnetic member 12 and is fixed to the movable body 22 when the coil is energized. The sliding portion 21 of the valve body 20 has an inlet 16 as shown by a broken line in the figure.
Also, the outlet 18 is not covered, and both ports communicate with each other through the valve chamber 30. Therefore, the inflow pipe and the outflow pipe 17 not shown communicate with each other, and the fluid flows.

When the coil is not energized, as shown in FIG.
Is attracted by the permanent magnet 19 and held in contact with the cylindrical body 11 at a point P, the sliding portion 21 of the valve body 20 fixed to the movable body 22 covers the outflow port 18, and the fluid is blocked. It is a thing.

(Effects of the Invention) Since the present invention is configured as described above, the movable body that moves in the magnetic flux rolls in the cylindrical body, does not generate a collision noise, and has a long product life. The movable body is
Since it moves in a direction substantially along the magnetic flux between the magnetic body that guides the magnetic flux to this movable body and the housing having the magnetic member,
The loss of operating force is small, and a large operating force can be obtained with less electric power.

In particular, since the permanent magnet is provided on the outer circumference of the cylinder and the magnetic force of the permanent magnet attracts and holds the movable body, the movable body can be securely attracted and held at a predetermined position when the coil is not energized without using a spring or the like. This enables the solenoid valve to be easily processed and assembled.

Also, the polarity of the permanent magnet is arranged so that the polarity of the surface facing the movable body is the same as the polarity generated on the outer circumference of the movable body when the coil is energized, so that the movable body repels the permanent magnet when the coil is energized. However, this repulsive force assists the rolling of the movable body in the direction of the magnetic member, the movable body moves quickly and strongly, and the amount of electricity to the coil is small.

Further, when the valve body and the movable body are fixed so as to be slidable in the axial direction, even if the movable body moves in the axial direction to some extent during the movement of the movable body, the valve should be surely pressed against the valve seat surface. The valve operation is stable.

[Brief description of the drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a sectional view of a portion B-B shown in FIG. 3, and FIG. 2 is A of FIG. 1 in a state where the coil is not energized. -A sectional view of the portion A, Fig. 3 shows the first state in which the coil is energized.
4 and 5 show a second embodiment of the present invention, FIG. 4 is a sectional view showing a state in which the valve is opened when energized, and FIG. 5 is the same. It is sectional drawing which is closed at the time of non-energization. 1 ... Housing, 2 ... Coil 4 ... Set screw, 5 ... Upper lid 7 ... Projection part, 10 ... Outer wall 11 ... Cylindrical body, 12 ... Magnetic member 13 ... Valve body, 14 ... Valve Seat 16 …… Inlet, 17 …… Outflow pipe 18 …… Outlet, 19 …… Permanent magnet 20 …… Valve element, 22 …… Movable body 24 …… Sliding member, 25 …… Hole 29 …… Ball , 30 …… valve chamber

Claims (1)

(57) [Claims] 1. A valve body provided with a coil inside a housing made of a magnetic material, a cylinder being hung vertically below the coil, and having an inlet, an outlet, and a valve seat surface at the lower end of the cylinder. To form a valve chamber, and a ring-shaped movable body made of a magnetic material is rotatably disposed on the valve body provided with a sliding portion facing the valve seat surface in the valve chamber. A magnetic member is fixed inside, and a permanent magnet is provided at a position distant from the magnetic member in the circumferential direction of the cylindrical body, and the polarity of the surface of the permanent magnet facing the movable body is set to the outer periphery of the movable body when the coil is energized. It has the same polarity as the generated polarity, and attracts and holds the movable body by the permanent magnet when the coil is not energized, and when the coil is energized, repels the permanent magnet due to the polarity generated on the outer periphery of the movable body and moves by the magnetic member. By suctioning and holding the body, the valve body can be used for inlet or outlet. Solenoid valve, characterized in that opening and closing the.