JPS60237285A - Solenoid valve - Google Patents

Abstract

PURPOSE:To reduce the electric power consumption of the solenoid valve and simplify the structure of a solenoid coil by a method wherein the position of a plunger, moved by the conduction of the solenoid coil, is held mechanically. CONSTITUTION:When the coil is conducted at first under the closed condition of the valve, the plunger 11 is moved by being attracted to an attracting piece 6 side and the plunger is rotated by the slope 15 of a waveform groove 13 at that moment. The valve is fully opened under this condition and when the conduction of the coil is eliminated subsequently, the position B of a protuberance 12 is moved by the force of a spring 7 to a point C, however, the opening degree of the valve is fully maintained also under this condition. When the coil is conducted again, the position of the protuberance 12 is moved to another point D, thereafter, the position of the protuberance is moved to the point A by the force of the spring and the valve is closed when an electric source is intercepted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a solenoid valve that opens and closes a flow path using electromagnetic force, and particularly relates to a solenoid valve having a structure that reduces power consumption and costs of the solenoid coil. .

Conventional Structure and Problems Conventionally, electromagnetic valves have been generally used to control the flow of internal fluid intermittently. Here, the configuration of a direct-pull type solenoid valve used for opening and closing a refrigerant flow path in a refrigerant circuit of a refrigerator, air conditioner, etc. will be taken as an example and its structure will be explained. Figure 1 is a cross-sectional view of a conventional small direct-acting solenoid valve for refrigerant.
．． Inside the main body 1 to which the outlet pipe 3 is welded, a plunger 6 with a spherical valve 4 caulked to the end is housed so as to be movable in the vertical direction. The plunger 5 is pressed downward by a spring 7 inserted in the body 1, and an electromagnetic coil 9 is placed around the attractor 6 at the top of the body 1, blocking the outlet port 8 facing the outlet pipe 3 at the bottom of the body 1. In the structure of 0 or more, which has a structure fixed by screws 10, the refrigerant flowing from the inlet pipe 2 is pushed by the spring T when the electromagnetic coil 9 is not energized, and the plunger 5 is pressed downward as described above, and the spherical valve Since the port 4 is blocking the outlet boat 8, it is blocked by the valve portion and does not exit to the outlet pipe 3. However, when the electromagnetic coil 9 is energized, the upward force caused by the electromagnetic force is combined with the downward force caused by the spring 7, causing the plunger 6 to move upward, opening the space between the spherical valve 4 and the outlet port 8, and allowing the refrigerant to flow. It is something to do. FIG. 2 is a diagram showing the valve operation and energization timing of the solenoid valve in the conventional example, and as is clear from the above explanation, it is necessary to continuously energize the solenoid valve while the valve is open. This was not desirable from the standpoint of energy conservation, as it consumed electricity all the time. Also, constantly energizing the electromagnetic coil has a negative effect on the durability of the electromagnetic coil, so in order to maintain safety against temperature rises in the coil, the coil winding must be highly heat resistant or a temperature fuse may be installed inside the coil. It also had the disadvantage that the manufacturing cost of the coil was high because it required measures such as mounting the coil.

OBJECTS OF THE INVENTION The present invention aims to eliminate the above-mentioned conventional drawbacks, reduce power consumption of an electromagnetic valve, and reduce costs by simplifying the structure of an electromagnetic coil.

Structure of the Invention The present invention has an inlet and an outlet for a fluid, and a plunger that opens and closes a flow path between them by switching an electromagnetic coil between an energized state and a de-energized state. By providing a mechanism to hold the
The valve is configured to maintain the open or closed state even if the electromagnetic coil is energized once and then de-energized.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be explained by taking a small direct-acting solenoid valve for refrigerant as an example, with reference to FIGS. Add numbers and omit descriptions of parts.

FIG. 3 is a cross-sectional view of a small direct-acting solenoid valve for refrigerant according to an embodiment of the present invention. It is in. As shown in FIG. 3, the plunger 11 has a wave-shaped groove 13 formed all around its outer circumference.
The shape of the wave-shaped groove 13 is such that, when expanded all around, two types of top heights alternate as shown in FIG. 4.

- A protrusion 12 is provided inside the blade body 14 to guide the plunger 11 so that it enters the wave-shaped groove 13 and moves in the rotational direction by the inclined portion 15 of the wave-shaped groove 13 in accordance with the vertical movement of the plunger 11. It is being

The heights hl and h2 of the wave-shaped grooves 13 are set so that the difference h1-h2 becomes the necessary movement amount of the spherical valve 4 when the valve is opened, and the height hl of the higher wave-shaped groove 13 is set so that the difference h1-h2 is the required amount of movement of the spherical valve 4 when the valve is opened. The setting is made within a range where the sieve plunger 11 can be moved sufficiently by the suction force.

In the above configuration, when the electromagnetic coil 9 is initially de-energized, the spherical valve 4 is pressed against the outlet port 8 by the spring 7, and when the valve is in the closed state, the protrusion 12 is located at the position shown in FIG. 4A. When the electromagnetic coil is energized, the plunger 11 is attracted to the attractor 6 side and moves.
are rotated at the same time by the inclined portion 16, and relatively come to the position shown in FIG. 4B. At this time, the amount of movement of the spherical valve 4 is hl,
When the valve is opened, the required travel distance h1-h2 is larger than that of the valve, and the valve is in a state where the valve has a sufficient amount of movement.Next, when the electromagnetic coil is de-energized, the position of the protrusion 12 moves to C. The position becomes D, and when the current is further de-energized, the position becomes A', and the valve returns to its original closed state.

In other words, each time the energization and de-energization cycles are repeated, the valve alternates between an open state and a closed state, and the timing of valve operation and energization is as shown in Figure 6, and when the valve is opened, the electromagnetic coil is This eliminates the need to continue energizing.

In the explanation of this embodiment, a structure was described in which the position of the plunger can be mechanically held by guiding the wave-shaped groove and the protrusion. It is also possible that
The point is that the object of the present invention can be achieved as long as the position of the plunger can be mechanically maintained during energization, and the structure is not critical.

Effects of the Invention As is clear from the above explanation, the solenoid valve of the present invention is designed to mechanically maintain the position of the plunger when energized. There is no need to continuously energize the valve, and the effect of reducing the power consumption of the valve can be obtained. Furthermore, since there is no need to continuously energize, the temperature rise in the electromagnetic coil is also very small, so there is no need to make the coil winding highly heat resistant or install a temperature fuse inside the coil as a countermeasure against temperature rise. At the same time, the effect of reducing the cost of the electromagnetic valve can be obtained, and the effect of eliminating the electromagnetic noise generated when the current is applied during operation can also be obtained at the same time.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional small direct-acting solenoid valve for refrigerant, Fig. 2 is an explanatory diagram of the valve operation and energization timing of the solenoid valve, and Fig. 3 is a small-sized direct-acting solenoid valve for refrigerant according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of the direct-acting solenoid valve, FIG. 4 is a developed view of the wave-shaped groove formed in the plunger on the outer peripheral surface of the plunger, and FIG. 5 is an explanatory diagram of the valve operation and energization timing. 2... Fluid inlet section, 3... Fluid outlet section, 9... Electromagnetic coil, 11... Plunger, 12 and 13... Protrusions and corrugated grooves (mechanism that mechanically holds the plunger in position when energized). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A plunger that opens and closes an inlet and an outlet of the fluid, a flow path between them by switching between energized and de-energized states of an electromagnetic coil, and a mechanical position of the plunger that is moved by energization of the electromagnetic coil. A solenoid valve with a holding mechanism.