JPH0443657Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a dual-holding electromagnetic valve device that can maintain the same operating state even after energization is stopped.

[Conventional technology]

Generally, in a solenoid valve, a solenoid coil is energized by passing a current through it, which attracts a plunger directly connected to the valve plug to open or close the valve, such as an opening operation.When the current is cut off, the valve plug's return spring is activated. The valve is configured to return to its original state due to fluid pressure or the like.

Therefore, in order to maintain the operating state of the electromagnetic valve, it is necessary to continue energizing it. However, if the current is continued for a long time, the insulation of the solenoid coil deteriorates due to the Joule heat, resulting in unfavorable conditions in terms of power saving, etc.

In order to solve this problem, conventionally, for example, JP-A-57
In Japanese Patent No. 22483, a configuration as shown in FIG. 5 is proposed. That is, the solenoid coil 21 for the electromagnetic valve is energized to attract the plunger 22 against the return spring 23,
While operating the electromagnetic valve 24, the tip pin 27 of the locking plunger 26, which is pressed by the spring 25, is engaged with the lower end surface 22a of the plunger 22, so that the plunger 22 is kept in the suction position even if the energization to the solenoid coil 21 is stopped. It is configured to hold the

To restore the operation of the electromagnetic valve 22, the lock releasing solenoid coil 28 is energized and the locking plunger 2 is moved against the spring 25.
6, and its tip pin 27 and plunger 2
2 is disengaged from the lower end surface 22a, the plunger 22 is pushed down by the pressing force of the return spring 23, and the electromagnetic valve 24 is returned to its original position.

[Problem that the invention attempts to solve]

However, in the double-holding electromagnetic valve disclosed in the above-mentioned publication, the engagement between the pin 27 and the lower end surface 22a of the plunger 22 is in a point contact state, and moreover, the spring 23 for returning the plunger 22 Due to the large friction caused by the pressure (which is proportional to the port diameter of the electromagnetic valve 24), the engagement is difficult to disengage, and a large lock release solenoid is required to reliably disengage the engagement. There is a problem with that.

In addition, in this configuration, a return spring 23 is used to easily disengage the pin from the plunger.
If the spring pressure of the solenoid valve is weakened, the pressure to seal the solenoid valve will be weakened, and therefore the port diameter will have to be made smaller, and if the port diameter is made smaller, the operating time for fluid control by the solenoid valve will be longer. The problem arises that they get used to it.

An object of the present invention is to provide a dual-holding electromagnetic valve device that can reliably maintain the same operating state even after the energization of the driving electromagnetic valve is stopped, and that has a simple structure.

[Means and actions for solving problems]

The present invention includes a poppet valve on the inlet side of the fluid path of the valve body that opens and closes the fluid path, and a poppet valve on the outlet side that closes and opens the outlet of the fluid path in accordance with the opening and closing of the poppet valve. It is provided integrally connected to a piston that is actuated by the operation of a driving solenoid valve, and is in the same operating state due to the fluid pressure in the fluid path that is received by either one of the pair of poppet valves after the driving solenoid valve is deenergized. This is a dual-holding electromagnetic valve device configured to hold.

With this configuration, when the poppet valve that opens and closes the fluid path is opened by operating the driving solenoid valve, the other poppet valve closes the outlet of the fluid path, and the fluid pressure received by the poppet valve itself is reduced. When the poppet valve, which opens and closes the fluid path, is closed by the operation of the driving solenoid valve,
The other poppet valve opens the outlet of the fluid path, and this state is maintained by the fluid pressure received by the poppet valve itself, which opens and closes the fluid path.

〔Example〕

Examples will be described below. FIG. 1 is a schematic sectional view of an embodiment of a dual-holding electromagnetic valve device according to the present invention. In the figure, 1 is a driving electromagnetic valve solenoid coil, 2 is a return electromagnetic valve solenoid coil, 3 and 4 are valves that are operated by the energization of the solenoid coils 1 and 2, respectively, and 5 is a valve that is operated by the operation of the valves 3 and 4. The downwardly or upwardly driven pistons 6, 7 are poppet valves integrally connected to the piston 5, the poppet valves 6, 7 being respectively arranged in the fluid path 8;
It is designed to control the flow of fluid. 9 is a spring that urges the piston 5 upward; 10 and 11 are inlets and outlets of the fluid path 8; and 12 is an inlet that introduces pilot air to drive the piston 5 by operating the valves 3 and 4. and 13, 14, 15
are discharge ports, and 16 and 17 are return springs for the valves 3 and 4, respectively.

Next, the operation of the dual holding electromagnetic valve device configured as described above will be explained. FIG. 1 shows a state in which neither of the solenoid coils 1 and 2 is energized and biased, and in this state, the valves 3 and 4 are biased to the closed state by the springs 16 and 17. Therefore, the air supply port is closed, so that no pilot air pressure is applied to the spring 5, and the spring 5 is held in the raised position by the upward force of the spring 9. As a result, the poppet valve 6 is in an open state, and fluid such as air enters from the inlet 10 and exits from the outlet 1.
It is flowing towards 1 as shown by the arrow.

Next, when the solenoid coil 1 is energized, the valve 3 is opened and the piston 5 is pushed downward against the spring 9 by the pilot air introduced from the inlet 12, as shown in FIG. be done. Accordingly, the poppet valve 6 is closed, and the poppet valve 6 blocks introduction of fluid such as air from the inlet 10.

On the other hand, since the poppet valve 7 opens the exhaust port 13 side, fluid such as air that has entered the outlet 11 side is discharged from the exhaust port 13.

Next, when the power to the solenoid coil 1 is cut off, the valve 3 is biased by the spring 16 and closed, cutting off the introduction of air, as shown in FIG. It is discharged from the discharge port 14. As a result, the pressing force pushing down the piston 5 disappears, and the piston 5 tries to rise due to the return spring 9, but
The poppet valve 6 cannot rise due to fluid pressure such as air applied to the poppet valve 6 from the inlet 10 side (the pressure applied to the poppet valve 6 is set to be greater than the spring pressure of the spring 9). ,
Therefore, the piston 5 is prevented from rising, and even if the solenoid coil 1 is deenergized, the operating state of the electromagnetic valve device is maintained as it is.

Next, when the return solenoid coil 2 is energized and energized, the valve 4 is opened as shown in FIG.
As shown, pilot air is introduced to drive the piston 5 upward (the driving force of the piston 5 due to the opening of the valve 4 is set to be greater than the pressure applied to the poppet valve 6). As a result, the poppet valves 6 and 7 are also driven upward, returning to the state shown in FIG.
0 to outlet 11 again. Even if the power supply to the solenoid coil 2 is cut off, the piston 5 is kept pressed upward by the spring 9.

Specifically, the dual-holding electromagnetic valve device configured as described above is used, for example, in a vehicle height adjustment device for an air suspension of a bus. That is, to ensure safety, the air suspension system of a bus is configured to always return to the normal vehicle height if the power to the electromagnetic valve is cut off due to a disconnection or the like. However, when parking on a car ferry, it is necessary to lower the vehicle height to prevent shaking, but when parking the vehicle, the main power of the vehicle is turned off, which is the same as a disconnection, and the vehicle height does not rise. You'll end up getting tired. In order to avoid such a situation, by applying the double-holding electromagnetic valve device according to the present invention, the electromagnetic valve device can be maintained in the same state even if the main power is turned off.
This is extremely convenient because the vehicle height can be easily maintained in a lowered state.

[Effect of idea]

The present invention allows the same operating state to be reliably maintained even if the energization of the driving electromagnetic valve is interrupted, and this maintenance is achieved by the fluid pressure that is applied to either one of the pair of poppet valves. ,
There is no need for a special pressure-receiving member for self-holding,
The structure of the solenoid valve for holding both sides can be simplified.

Furthermore, since the poppet valve is not directly operated by the plunger energized by the solenoid coil, the solenoid coil can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the dual-holding electromagnetic valve device according to the present invention, and FIGS.
The figures each show an operating mode of the device shown in FIG. 1, and FIG. 5 is a schematic diagram showing an example of the configuration of a conventional dual-holding electromagnetic valve. In the figure, 1 is a driving electromagnetic valve solenoid coil, 2 is a return electromagnetic valve solenoid coil, 3 and 4 are valves, 5 is a piston, 6 and 7 are poppet valves, 8 is a fluid path, 9 is a return spring,
10 is an inlet, 11 is an outlet, 12 is an inlet, 13, 14, 15 are exhaust ports, 16,
17 indicates a valve return spring.

Claims (1)

[Scope of utility model registration request] A solenoid valve for driving a poppet valve that opens and closes the fluid passage on the inlet side of the fluid passage of the valve body, and a poppet valve that closes and opens the discharge port of the fluid passage on the outlet side according to the opening and closing of the poppet valve. The poppet valve is provided integrally connected to a piston that is actuated by the operation of the poppet valve, and is configured to maintain the same operating state by the fluid pressure in the fluid path that is received by either one of the pair of poppet valves after the driving electromagnetic valve is deenergized. A dual-holding solenoid valve device characterized in that it is configured as follows.