JPH035741Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention includes a valve seat having an opening surface that communicates with three flow path pipes, and a movable iron core of a solenoid device via a bracket on the opening surface. The bracket is provided with front and rear abutting portions that abut, respectively, the front cover and back cover of the casing housing the valve seat and the valve slide, and The valve slide is provided with a pilot valve seat corresponding to a pilot valve element of a pilot valve device fixed to the movable iron core via an arm, and is formed to control fluid pressure inside and outside the valve slide. Regarding a valve device.

[Conventional technology]

A conventional valve device with a pilot valve device will be explained with reference to FIGS. 7 and 8. In FIG. 7, the valve slide 5 is driven by the movable iron core 8 of the solenoid device 6 via the bracket 11 to move to the left in the figure, and the front contact portion 11A of the bracket 11 is in contact with the front plate 2. Show the moment. In this case, the flow path pipes A and B provided on the valve seat 4 communicate with each other via the valve slide 5 to form a flow path with each other. FIG. 8 shows the moment when the valve slide 5 moves to the right and the rear contact portion 11B of the bracket 11 comes into contact with the back plate 3. Flow path pipes B and C provided on the valve seat 4 communicate with each other via a valve slide 5 to form a flow path with each other.

In such a valve device, the valve slide 5 is moved at the above two positions where the fluid flow path is switched.
must be precisely aligned with each flow tube.

Inside the casing 1, there is a difference in fluid pressure between the inside and outside of the valve slide 5, and due to the piping, the fluid pressure outside the valve slide 5 is greater than the fluid pressure inside. In this case, the driving force of the solenoid device 6 is insufficient to move the valve slide 5 to switch the fluid flow path as described above. For this purpose, a pilot valve arrangement is provided to regulate the fluid pressure.

The pilot valve device 15 is composed of a pilot valve body 13 provided at one end of an arm 12 fixed to the movable iron core 8 via a pin 10, and a pilot valve seat 14 provided on the valve slide 5. The opening and closing of the pilot valve device 15 is performed by relative movement between the pilot valve body 13 and the pilot valve seat 14, but in the conventional device, the above relative movement, that is, the stroke 1, is performed by the bracket 1.
It was installed between 1 and valve slide 5. Due to this stroke, when the suction area is repelled by the solenoid device and moves, a displacement occurs between the pilot valve body 13 and the valve slide 5 having the pilot valve seat 14, and the pilot valve device 15 becomes "open". This reduces the difference in fluid pressure between the inside and outside of the valve slide to facilitate movement of the valve slide 5.

[Problem that the invention attempts to solve]

However, as can be seen from FIGS. 7 and 8, there is a stroke l in front of the valve slide 5 that is moving to the left (FIG. 7), and there is a stroke l in front of the valve slide 5 that is moving to the right. There is also a stroke l (Fig. 8). Therefore, if the fluid pressures on the inside and outside of the valve slide 5 are equalized, the valve slide 5 will not stop at a predetermined position due to inertia, and the valve slide and the flow pipe will not align accurately. In this case, the valve slide 5 will cover part of the hole in the flow path pipe. At the same time, the pilot valve device 15 remains slightly open. In this case, valve leakage of the pilot valve device occurs. For this reason, both factors combine to make it difficult to secure the desired flow rate, making it impossible to obtain sufficient characteristics of the valve device.

SUMMARY OF THE INVENTION An object of the present invention is to provide a valve device with a pilot valve device that eliminates the drawbacks of conventional valve devices with a pilot valve device and improves its operating characteristics.

[Means for solving problems]

The above object is achieved by a valve device with a pilot valve device in which the valve slide is fixed to the bracket and the connecting portion between the bracket and the movable iron core is provided with a stroke approximately equal to the opening/closing movement distance of the pilot valve device.

[Embodiments] The present invention will be described in detail below with reference to embodiments shown in FIGS. 1 to 6. Incidentally, parts that are the same as those in the device of the present invention and the conventional device are indicated using the same reference numerals.

Both ends of the casing 1 are closed by a front cover 2 and a back cover 3, which also serve as stoppers, and the casing 1 includes a stationary valve seat 4 and a movable valve slide that slides on the opening surface of the valve seat. 5 is built-in.

The valve seat communicates with the three flow pipes A, B, C and the openings mentioned above (D is not connected), and the valve slide 5 alternately connects the two flow pipes A, B and B, C. It is formed to cover.

In order to move the valve slide 5 in the axial direction of the casing, the front cover 3 of the casing is
A solenoid device 6 is provided outside. The solenoid device includes an electromagnetic wire ring 7 and a movable iron core 8 and a fixed iron core 9 housed in a cylinder inside the electromagnetic wire ring 7. A pin 10 is provided at the end of the movable core 8 that protrudes into the casing 1, and the pin 10 connects the bracket 11 of the valve slide 5 and the arm 12 of the pilot valve device.
Attach it to the movable iron core 8.

The above-mentioned bracket 11 is fixed to the valve slide 5 and has a contact portion that abuts the front cover 2 in the final position moved to the left in the figure and abuts the back cover 3 in the final position moved to the right in the figure. 11A and 11B, respectively. Note that the contact portion 11B is connected to the bracket 1 as shown in FIG.
It is formed to protrude laterally from 1. Arm 1
A pilot valve element 13 is provided at the free end of the valve slide 5, and a port-shaped pilot valve seat 14 corresponding to the pilot valve element 13 is provided on the valve slide 5. A pilot valve device 15 is configured.

In this embodiment, the arm 12 is fixed to the movable iron core 8 by the pin 10, but the arm 12 is fixed to the movable core 8 by the pin 10.
has an elongated hole in the axial direction, and therefore has a stroke or movement distance L with respect to the pin 10 and is connected to the movable iron core 8.

Next, the operation of the present invention will be explained with reference to FIGS. 1 to 6.

In FIG. 1, flow pipes A and B communicate with each other. In this state, the difference in fluid pressure between the inside and outside of the valve slide 5 is large, making it difficult to move the valve slide. When the movable iron core 8 is sucked to the right by the solenoid device 6, the pilot valve body 1 first
Only 3 moves. As the pilot valve body 13 moves, the pilot valve device 15 becomes "open", and the difference in fluid pressure between the inside and outside of the valve slide 5 becomes small, making the movement of the valve slide 5 easier. Therefore, the valve slide 5 starts moving with a delay of stroke length L from the pilot valve body 13 (FIG. 2).

At the end of the above movement, the rear contact portion 11B of the bracket 11 contacts the back cover 3, and the valve slide 5 stops. In this case, the pilot valve device 15 is still in the "open" state (FIG. 3).
The valve slide 5 is aligned with the flow pipes B, C, and the flow pipes B, C communicate with each other. The valve slide 5 is fixed by supplying fluid from the flow pipe D and sucking fluid from the flow pipe B or C to increase the difference in fluid pressure between the inside and outside. In this state, by instantaneously reversely energizing the solenoid device 6, the pilot valve device 15 is closed and the fluid is switched (FIG. 4).

To return from the state shown in FIG. 4 (flow pipes B and C communicate with each other) to the state shown in FIG. 1 (flow pipes A and B communicate with each other), the operation is reversed to that described above.

First stop the fluid supply or suction. At this time, the pressure difference between the inside and outside of the valve slide 5 is large.
When the solenoid device 6 is momentarily energized positively and the movable iron core 8 is attracted, the pilot valve device 15 becomes “open” and the pressure difference between the inside and outside of the valve slide 5 becomes smaller, thus making it easier to move the valve slide 5. (Figure 5).

Next, the solenoid device 6 is reversely energized to move the valve slide 5 to the left. Although the pilot valve device 15 is "closed" during this movement, it does not interfere with the smooth movement of the valve slide 5 because the pressure difference between the inside and outside is approximately equal.

At the end of the leftward movement, the front contact portion 11A of the bracket 11 comes into contact with the front cover 2, and the valve slide 5 stops (FIG. 1).
In this state, the valve slide 5 is connected to the flow path pipe A,
B, and the flow pipes A and B communicate with each other.

[Effect of idea]

Bracket 11 for moving valve slide 5
At the end of rightward movement, the rear abutment part 11
B is stopped by the back plate 3, and is stopped by the front contact portion 11A coming into contact with the front plate 2 at the end of the movement to the left. In the present invention, the valve slide 5 is fixed to the bracket 11, and at the end of the above movement, the stroke L is between the bracket 11 and the movable iron core 8.
Since the connecting portion with the valve slide 5 is generated at the rear in the direction of movement of the pin 10, the bracket 11 will not move further due to inertia after stopping even when the difference in fluid pressure between the inside and outside of the valve slide 5 is small. Furthermore, the valve slide does not move relative to the bracket 11 due to inertia. Therefore, with a very simple modification, the flow rate in the valve device can be ensured and sufficient characteristics of the valve device can be obtained.

[Brief explanation of the drawing]

Figures 1 to 5 are longitudinal sectional views showing the operating order of the present invention, Figure 6 is an enlarged plan view showing the main parts, and Figures 7 and 8 are longitudinal sectional views showing the operating order of the conventional example. be. 1...Casing, 2...Front cover, 3
...Back cover, 4...Valve seat, 5...
Valve slide, 6... Solenoid device, 8...
Movable iron core, 10... Connecting part (pin), 11... Bracket, 11A... Front abutting part, 11B... Rear abutting part, 12... Arm, 13... Pilot valve body, 14... Pilot Valve seat, 15... Pilot valve device, A, B, C, D... Channel pipe, L...
stroke.

Claims (1)

[Scope of utility model registration request] A valve seat 4 has an opening surface that communicates with three flow pipes A, B, and C, respectively, and a movable core 8 of the solenoid device 6 is mounted on the opening surface via a bracket 11.
Valve slide 5 slidably formed by
The bracket is provided with front and rear contact portions 11A and 11B that abut, respectively, the front cover 2 and back cover 3 of the casing 1 containing the valve seat and valve slide, and the valve slide 5 is provided with A pilot valve seat 14 corresponding to a pilot valve body 13 of a pilot valve device 15 fixed to the movable iron core 8 via an arm 12 is provided to control the fluid pressure inside and outside the valve slide 5. In this valve device, the valve slide 5 is attached to the bracket 1.
1 and the bracket and the movable iron core 8.
A valve device with a pilot valve device, characterized in that a stroke L approximately equal to the opening/closing movement distance of a pilot valve device 15 is provided at a connecting portion 10 with a pilot valve device 15.