JPH0320617Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a direct-acting valve device, and particularly to a direct-acting valve device whose structure has been improved to achieve simplification and improved reliability.

[Technical background of the invention and its problems]

A solenoid valve called a four-way valve is used to switch the refrigeration cycle of an air conditioner. This four-way valve is known to have a structure that includes a valve box and a pilot valve part, and in which the flow path is switched by a slider connected to a piston housed in the valve box. However, since this structure uses a piston, the valve box must be cylindrical, while the slider is flat, so a valve seat with a semicircular cross section is brazed to the inner wall of the valve box. was forming.

Therefore, it is difficult to process and assemble them, and liquid leakage may occur from the brazed portion between the valve seat and the inner wall, which poses a problem in terms of reliability.

On the other hand, in response to demands for simplification and cost reduction for four-way valves, a direct-acting four-way valve 1 as shown in FIG. 5 has been proposed. The direct acting four-way valve 1 shown here is provided with four communication holes through which fluid can pass, in the partition wall 3 of the valve box 2, and these communication holes are connected to external connection pipes 4, 5, 6, 7. is connected. Further, a valve seat 8 having holes at positions corresponding to the axes of the tubes 4, 5, 6, and 7 is attached to the inner wall surface of these communication hole portions. Further, inside the valve box 2, a slider 9 is provided as a movable member that slides on the valve seat 8 and is supported so as to be reciprocating in the left-right direction in the drawing. The main part of the slider 9 has a semicylindrical outer shape, and its plane part is formed into a concave shape and is supported in a face down state on the valve seat 8.

Next, a bracket is attached to this slider 9, and one permanent magnet 11 is further provided on the bracket 10 so that the north and south poles are aligned in the sliding direction of the slider 9. And permanent magnet 1
When a pulsed DC current is supplied to the coil 12 installed on the outside of the coil 1, the slider 9 reciprocates with a stroke equivalent to one pitch between the tubes 4, 5, and 6 depending on the direction of the DC current. It's summery.

Thus, in the illustrated state, tubes 4 and 7 form a fluid passage through the outside of slider 9, while tubes 5 and 6 similarly form a fluid passage through the inside of slider 9.

On the other hand, when a pulsed current is applied to the coil 12 to drive the permanent magnet 11 to the left in the drawing, the tubes 5 and 6 form a fluid passage through the inside of the slider 9, while the tubes 6 and tube 7 form a fluid passage.

Thereafter, when a pulsed current in the opposite direction is passed through the coil 12, the state shown in the figure is restored again.

However, even in the above-mentioned direct-acting four-way valve 1, since the structure requires the valve seat 8,
The simplification, cost reduction, and reliability improvement that accompany this cannot be said to be sufficient.

[Purpose of invention]

The present invention was developed in consideration of the above circumstances, and takes advantage of the features of a direct-acting valve device that does not have a piston, and has a structure that eliminates the valve seat, resulting in lower costs and improved reliability due to simplification. It is an object of the present invention to provide a direct-acting valve device that can achieve the following.

[Summary of the idea]

In order to achieve the above object, the present invention provides a direct acting valve device in which the slider slides and the partition wall of the valve box in which the communication hole is formed is partially or entirely flat in cross section. It has a structure in which the valve seat is integrally molded, and the valve seat is eliminated, and the slider can be slid directly on the inner surface of the partition wall of the valve box having the communication hole to selectively switch the communication between the pipes. be.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a direct-acting valve device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side sectional view showing a direct acting four-way valve 1, and 2 is a valve box.

Inside this valve box 2, a slider 9 is connected via a bracket 10 to a permanent magnet 11, which is a plunger, as in the conventional case. Further, a coil 12 is attached to the outside of the permanent magnet 11.

On the other hand, the partition wall 3 of the valve box 2 is provided with four communication holes through which fluid can pass, and pipes 4, 5, 6, and 7 for external connection are connected to these communication holes.

Here, the feature of the present invention is that the slider 9 inside the substantially cylindrical valve box 2 slides and the partition wall 3a of the portion where the communication hole is formed is moved as shown in FIG. It is integrally molded to have a flat cross-section.

FIG. 2 is a sectional view taken along the - line in FIG. 1.

Therefore, the slider 9 is configured to slide directly on the inner surface of the partition wall 3a of the valve box 2 without requiring the conventional valve seat 8.

Next, the operation of this embodiment will be explained.

In the state shown in FIG. 1, the tube 4 and the tube 5 communicate through the inside of the slider 9 to form a fluid passage. On the other hand, the tube 6 and the tube 7 communicate with each other on the outside of the slider 9 to form a fluid passage.

On the other hand, when a pulsed current is applied to the coil 12 to drive the permanent magnet 11 to the right in the drawing, the slider 9 slides on the inner surface of the partition wall 3a, causing the tube 5 and tube 6 to slide. It stops at a position that covers the As a result, the pipe 5 and the pipe 6 communicate with each other within the slider 9, and the pipe 4
and the tube 7 come into communication on the outside of the slider 9. At this time, since the conventional valve seat is not interposed between the slider 9 and the partition wall 3a, there is no risk of fluid leakage from the brazed portion between the valve seat and the partition wall 3a as in the conventional case. , can't happen.

Thereafter, when a pulsed current in the opposite direction is passed through the coil 12, the state shown in the figure is restored again. .

Although the embodiments have been described above, in this embodiment, the partition wall 3a is formed into a planar shape only in the range in which the slider 9 slides, but the partition wall 3a is not limited to this and includes the pipe 7. The entire range may be formed in a planar shape.

In addition, as shown in FIGS. 3 and 4, the valve box 2
may be integrally constituted by two pieces 2a and 2b.

In the above embodiment, a four-way valve has been described, but the present invention is of course applicable not only to a four-way valve but also to a three-way valve and a two-way valve.

[Effect of idea]

As described above, in the present invention, since the partition wall of the substantially cylindrical valve box at least in the range in which the slider slides is formed to have a flat cross-section, the present invention exhibits the following excellent effects.

(1) Since valve seat parts are not required, the structure is simplified and contributes to cost reduction.

(2) Since there is no need to use valve seat parts, liquid leakage from the valve seat mounting portion, etc., unlike in the past, does not occur, and the reliability of the valve device is improved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of a direct acting four-way valve showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a direct acting type four-way valve showing another embodiment. A side sectional view of the four-way valve, FIG. 4 is a sectional view taken along the - line in FIG. 3,
FIG. 5 is a side sectional view showing a conventional direct-acting four-way valve. In the figure, 2 is a valve box, 3, 3a are partition walls, 4, 5,
6 and 7 are tubes, and 9 is a slider.

Claims (1)

[Scope of utility model registration request] A slider that slides along the longitudinal direction within the substantially cylindrical valve box through communication holes formed along the longitudinal direction of the partition wall of the valve box and communicating with a plurality of pipes connected to the valve box. In the direct-acting type valve device that selectively switches the communication between the plurality of pipes, the slider slides and covers the partition wall of the valve box in which the communication hole is formed by partially or A direct-acting valve device characterized by being integrally molded with a flat cross section throughout.