JPH0477840B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electromagnetically driven multi-way valve for switching fluid flow paths.

Conventional technology In a refrigeration circuit that performs cooling, etc., when the load fluctuates, the flow distribution of refrigerant to multiple heat exchangers may be changed, or the flow paths may be switched to change the operation mode. , a multi-way switching valve is used for this purpose.

On the other hand, microcomputer control is adopted as a control method for the refrigeration circuit, and an electromagnetic type or an electromagnetic pilot type is often used as an operating method. However, conventional electromagnetic switching valves only have a two-position switching function, so in order to achieve other methods such as simultaneous closing of multiple flow paths, simultaneous flow, or selective flow, multiple valves are required. I had no choice but to use it.

Problems to be Solved Under the circumstances described above, it is difficult to control a multi-port on-off valve that has the function of performing complete switching by selectively fully opening or fully closing multiple flow paths. The idea was to operate it using a simple electromagnetic actuator. However, even if you try to move the valve body in accordance with the port position using a normal actuator that combines a solenoid and a plunger, the valve body cannot be held at the correct position only by controlling the operating current. I found this to be difficult.

SUMMARY OF THE INVENTION Therefore, the present invention provides an electromagnetic multi-port opening/closing valve incorporating a lift position control mechanism capable of sequentially and accurately opening and closing a plurality of fluid ports using an electromagnetic actuator.

Means for Solving the Problems The object of the present invention as described above is to provide a valve body having a port surface through which a plurality of fluid ports are opened, and a slide valve that can slide parallel to the port surface to close the fluid ports. a plunger tube having a core fitted to the end portion thereof having a single solenoid coil on the outside thereof, passing through the upper cover of the valve body and having an axis parallel to the port surface; A single plunger is provided in the tube to face the core via a plunger spring and drives the valve body, and a single plunger is provided within a predetermined range surrounding the plunger so as to limit the amount of lift of the plunger. An electromagnetic multi-way port opening/closing valve comprising a movable annular stopper, and a stopper spring that is precompressed between the annular stopper and the lower surface of the upper lid and has a large spring load from the plunger spring. It can be achieved.

The present invention will be further explained below based on Examples.

Embodiment Fig. 1, 1 of the electromagnetic multi-way port opening/closing valve of the present invention
The structure of the embodiment is shown, and the valve body 1 is equipped with a fluid inflow pipe A and outflow pipes B and C.
A port surface 11 having respective outflow ports 1b, 1c is provided parallel to the valve axis. 2 slides in the axial direction in contact with the port surface 11 to open the port 1.
It is a valve body that can close b and 1c. The valve body 1 is provided with an upper lid 12, and a plunger tube 3 is attached to the valve body 1 by penetrating the upper lid 12. 4 is a solenoid coil, 5 is an adsorption core, and 6 is a plunger spring that always urges the plunger 7 downward. A valve body holder 10 is attached to the tip of the plunger 7 and transmits the movement of the plunger 7 to the valve body 2.

A stopper chamber 1d is formed in the upper part of the valve body 1 under an upper lid 12, and an annular stopper 8 slidable along the inner wall of the chamber 1d is inserted. An annular protrusion 8a is formed on the inner surface of the annular stopper 8.
A stopper spring 9 is provided between the annular protrusion 8a and the upper lid 12 in a compressed state. The stopper spring 9 has a spring load larger than that of the plunger spring 6, and constantly keeps the annular stopper 8 in the stopper chamber 1d.
is pressed toward the bottom of the Therefore, when the current is not applied, the lower end 8b of the annular stopper 8 is located in the stopper chamber 1d.
A gap Y is formed between the upper end 8c of the annular stopper 8 and the lower end of the upper lid 12.

A ring 7a provided on the outer surface of the plunger 7 is provided between the annular protrusion 8a and the bottom surface of the stopper chamber 1d.
is located, and when the plunger 7 is in the most depressed position, the annular protrusion 8a and the ring 7a
A gap X is formed between them.

When the solenoid coil 4 of the electromagnetic multi-way port on-off valve configured as described above is excited with a weak current,
The plunger 7 compresses the plunger spring 6 and is attracted to the core 5, but when the ring 7a comes into contact with the annular protrusion 8a, the compressed stopper spring 9 is not easily compressed further due to the large spring load. , the plunger 7 is maintained at the lift amount X. Next, apply a stronger current to the solenoid coil 4.
When energized, the stopper 8 is pushed up only when the attractive force of the solenoid coil 4 exceeds the sum of the spring load of the plunger spring 6 and the spring load of the stopper spring 9, and the lift amount increases by Y. becomes X+Y. Therefore, between these two states, the solenoid coil 4
The amount of lift does not change even if the suction force changes.

In the electromagnetic multi-port opening/closing valve of the present invention having such a structure, the position of the valve body 2 changes in three stages, so the ports 1b and 1c are sequentially opened. However, by changing the shape of the valve body 2 and the arrangement of the ports 1b and 1c, the order in which fluid is distributed to each port can be changed as appropriate. An example of such a valve body shape and port arrangement is shown in FIG. 2, but various other applications are possible, such as increasing the number of outflow ports to three.

FIG. 3 shows an example of a power supply circuit for driving such an electromagnetic multi-port opening/closing valve. In this example, 2
Using single-throw switches S ₁ and S ₂ , a weak excitation current is supplied to the solenoid coil 4 when only S ₁ is closed, and the resistor R is shorted when both S ₁ and S ₂ are closed. A strong excitation current is supplied. In addition, appropriate means may be adopted, such as supplying the excitation current from a constant current circuit with two-step switching, or changing the supply voltage in two steps.

Effects of the Invention The electromagnetic multi-port opening/closing valve of the present invention has a slide valve body driven by an electromagnetic actuator equipped with a lift amount limiting mechanism having a specific structure as described above, and can be easily controlled by current control. As a result, the position of the valve body can be accurately controlled, and the fluid flow path can be reliably switched in multiple stages, so not only can the flow path switching valve itself be manufactured economically, but the fluid piping system can also be economically manufactured. This has the effect of making it possible to configure the configuration.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the structure of an embodiment of the electromagnetic multi-port opening/closing valve according to the present invention, Fig. 2 is an example of a combination of its port arrangement and valve body shape, and Fig. 3 is an example of its driving power supply circuit. It is.

Claims (1)

[Claims] 1. A valve body provided with a port surface where a plurality of fluid ports open, a slide valve body that slides parallel to the port surface to close the fluid ports, a single solenoid coil provided on the outside, and an end portion. A plunger tube having a core fitted thereinto passes through the upper cover of the valve body so that its axis is parallel to the port surface; a single plunger that is provided to drive the valve body; an annular stopper that surrounds the plunger and is movable within a predetermined range so as to limit the amount of lift of the plunger; An electromagnetic multi-way port opening/closing valve comprising: a stopper spring that is precompressed with the lower surface of the upper cover and has a spring load greater than that of the plunger spring.