JPS59110981A - Self-holding solenoid valve - Google Patents

Abstract

PURPOSE:To obtain a self-holding solenoid valve of small power consumption, by providing a permanent magnet, attracting a moving iron core valve body, in one end of an arm, whose half way part is turnably supported to a prescribed supporting axis, and a permanent magnet, which can be moved by a solenoid coil, in the other end. CONSTITUTION:The bottom end of a moving iron core 11 is formed in a shape almost equal to a valve seat 10a so as to be brought in close contact with the valve seat 10a by its own weight. A permanent magnet 14 is secured to one end of an arm 12 extensibly existing above a main unit case 10. A permanent magnet 15 is fixed to the other end of the arm 12, and if a solenoid coil 17 is electrified, the permanent magnet 15 is repulsed by a bottom face 16b and attracted to the upper face. In this way, the permanent magnet 14 is lowered, and its attractive force lifts the moving iron core valve body 11 to be attractively held to an upper wall 10d.

Description

[Detailed description of the invention] (b) Field of invention The present invention relates to a self-holding solenoid valve.

(b) Background A conventional self-protecting solenoid valve (1) of this type is shown in FIG.

(2) is a hollow cylindrical pipe made of a non-magnetic material and has an inlet (2a) and an outlet (2b). (2c) is a valve seat formed in the pipe (2),
(3) is a movable iron core made of a magnetic material that is housed in the pipe (2) so as to be movable up and down. Moving iron core (3)
The lower end has substantially the same shape as the valve seat (2c) so as to be in close contact with the valve seat (2c). (4) is fixed to the upper end inside the pipe (2) and pushes down the movable iron core (3) so that the lower end is fixed to the valve seat (2c).
) is a coil spring that constantly generates a pressing force to close the refrigerant flow path. (5) is an exterior case made of magnetic material that forms a space outside the pipe (2), and the central part of the upper surface is a fixed iron core (6) that is in contact with the outer surface of the upper end of the pipe (2).
). A permanent magnet (7) and an electromagnetic coil (8) are arranged between the outer periphery of the pipe (2) and the outer case (5).

To explain the operation, the moving iron core (3) is attached to the electromagnetic coil (8).
When a current is passed in a direction that generates a magnetic field in the direction of pulling up the moving iron core (β), the moving iron core (β) is pulled up against the pressing force of the coil spring (4), passing through the upper end of the pipe (2) to the fixed iron core (6).
It is then attracted to the permanent magnet (force, outer case (5)
A magnetic closed circuit is formed by the fixed iron core (6) and the moving iron core (3), and the attraction is maintained even if the electromagnetic coil (8) is de-energized. In this state, the flow path is opened. From this state, move the moving iron core (3) to the electromagnetic coil (8) and fix the fixed iron core (6).
), the magnetic flux from the permanent magnet (7) is canceled out and the moving iron core (3)
is pulled away from the fixed iron core (6) by the expansion of the coil spring (4), is pressed downward, and comes into pressure contact with the valve seat (2C), closing the flow path. Therefore, the electromagnetic coil (8) only needs to be energized instantaneously when changing the opening/closing state of the flow path, resulting in energy savings.

(・→ Problems with the background technology In the conventional configuration, the fixed iron core (6) is moved from the moving iron core (3)
The coil spring (4) is incorporated because the extension force of the coil spring (4) is required to separate the solenoid valve (1). ) may cause malfunction. Also, the iron core (3) moves against the coil spring (4).
In order to raise the current, the electromagnetic coil (8) requires a relatively large operating current.

(b) Purpose of the Invention To provide a self-holding solenoid valve that consumes less power and operates stably by eliminating a coil spring that causes malfunction.

(E) Examples of the invention FIG. 2 shows a self-holding solenoid valve (9) of the present invention.

(101 is a cylindrical main body case made of a non-magnetic material, for example. A valve seat (10a), an inlet (10b) and an outlet (10c) are formed in the main body case 00). α1
) is a movable iron core made of magnetic material that is housed in the main body case (10) so as to be movable up and down. Movable iron core αI)
The lower end of the valve seat (10a) is in close contact with the valve seat (10a) under its own weight.
It has approximately the same shape as a). (121 is the main case 00
) An arm whose middle part is rotatably supported in the vertical direction on a spindle α3) provided nearby. (
I4) is fixed. The permanent magnet αa is positioned close to the earthen wall (10d) of the arm (main case 00 when the arm rotates counterclockwise in Fig. 2), and when the arm rotates clockwise (main case 00). They are placed further apart. A permanent magnet (151) is fixed to the other end of the arm <121, for example, with the upper surface as the north pole and the lower surface as the south pole. 06) is a fixed iron core around which an electromagnetic coil 07) is wound, and the fixed iron core
16) One end is divided into upper and lower halves, and each end face is made to face each other with an interval OQ again to form a substantially inverted C-shape. As a result, when the electromagnetic coil aD is energized, the same polarity will occur on the upper surface (16a) and lower surface (16b) of the interval 08. Permanent magnet (1ω is the upper surface that constitutes the interval u barrel (
16a) and the lower surface (16b) so as to be able to swing freely.

αω is a predetermined instantaneous pulse power supply, and (a) is the power supply (1
1 and the electromagnetic coil (17) to switch the direction of the current to the electromagnetic coil α force.

Next, the operation will be explained. In the state shown in Figure 2, the permanent magnet is 0!5
) is in close contact with the lower surface (16b) of the gap (18), and at this time, the permanent magnet 04) is lifted and separated above the main body case QO). In this state, the attractive force of the permanent magnet 04) exerted on the moving iron core (11) is weak and the moving iron core 01)
is under its own weight and its lower end is in close contact with the valve seat (10a),
At this time, the flow path is closed and the electromagnetic coil (17) is not energized. Next, when an instantaneous pulse current is passed through the electromagnetic coil αη in the direction of generating an S pole on the upper surface (16a) and lower surface (16b) of the fixed iron core α6, the permanent magnet (15) will move on the lower surface (
16b) and is attracted to the upper surface (16a). As a result, the permanent magnet (14) descends and the main body case aO)
The movable iron core α1) is lifted up by the attractive force of the permanent magnet α4), and the earth wall (10d)
is adsorbed to. After that, even if the power supply H is cut off, the permanent magnet will be 0.
This state is maintained by adhering 5) to the upper surface (16a). In this state, the solenoid valve (9) opens the flow path.

Next, when the switch (2) is changed and an instantaneous pulse current is passed through the electromagnetic coil 17) in the direction of generating N poles on the upper surface (16a) and the lower surface (16b), the permanent magnet (151) is connected to the lower surface (1
6b), whereby the permanent magnet α4) is lifted upward and separated from the main body case (10), and the movable iron core a1) falls under its own weight, closing the flow path.

In the solenoid valve (9), the current value required to operate the permanent magnet αa can be determined by appropriately setting the ratio of the length from the spindle 03) to the permanent magnet 04) and the length to the permanent magnet αω. It can be made smaller.

(f) Application Example of the Invention FIG. 3 shows an embodiment in which the solenoid valve (9) is applied to a refrigerant circuit of a cooling device as shown in FIG.

Components with the same reference numerals as those in FIG. 2 are the same items.

Also, (21) is a compressor, (2'!J is a compressor (21),
A condenser that cools the high-temperature, high-pressure refrigerant discharged (c)
is a pressure reducer, (24, is an evaporator, and (c) is a check valve.

At this time, the solenoid valve (9) opens and closes in accordance with the operation and stop of the compressor mortar), and thereby, when the compressor (2J) stops, the compressor (2]) and the high pressure side of the condenser (221) , maintains the pressure on the low pressure side of the pressure reducer (c) and evaporator (goods), and reduces the load when restarting the compressor (21).When used in such a refrigerant circuit, a solenoid valve is used. (9) is cooled by the refrigerant and dew formation occurs on the surface, so the main body case Cl0) is surrounded by a heat insulating material I26). At one end of the main body case (QO) side of the arm α, there is an auxiliary arm (
5) is rotatably connected.

There is a small room (c) above the earthen wall (10d) inside the insulation material (26).
is formed, this small chamber (permanent magnet α4 inside 28I) is housed in a vertically movable manner, and the auxiliary arm (27) is used as a heat insulating material (support).
) It is guided from above into the small chamber (28) through the through hole (29) and connected to the permanent magnet α, and the through hole (c) is sealed with a sealing material (2)).

With this configuration, the heat insulating material (26) only needs to be provided around the main body case α0, and there is no need to surround the entire electromagnetic valve as in the conventional case.

(g) Effects According to the solenoid valve of the present invention, it is only necessary to supply electricity when changing the opening/closing state of the flow path, so there is no heat generation, resulting in energy savings. In addition, since the coil spring can be omitted as in the past, malfunctions due to fatigue over time are not caused, and the operating current can be reduced by adjusting the ratio of the distance from the support shaft to the permanent magnets at both ends of the arm. be effective.

[Brief explanation of drawings]

The figure is a refrigerant circuit diagram. 00)...Body case, (10a)...Valve seat,
(11)...Moving iron core, (l'a...Arm,
03)... Support shaft, (I4), (15)... Permanent magnet, (16)... Fixed iron core, a7)... Electromagnetic coil. (Figure @Figure 4

Claims (1)

[Claims] 1. A movable iron core is housed in a case made of a non-magnetic material and has a valve seat, and is movable up and down and is housed in close contact with the valve seat; a fixed arm provided at one end of the arm, a first permanent magnet located above the case and attracting the movable iron core in close proximity to the case, and a fixed arm provided at the other end of the arm and provided with an electromagnetic coil. and a second permanent magnet moved by an iron core to bring the first permanent magnet close to or away from the case.