JPH0422085Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to an actuator, and more particularly to an actuator that can actuate a rod in multiple strokes by means of a single diaphragm.

[Prior art and its problems]

Conventionally, as an actuator capable of operating a rod in multiple strokes, there is an actuator that uses a plurality of diaphragms as means for operating the rod.

However, since the conventional diaphragm described above uses multiple diaphragms as a means to operate the rod, the overall structure is complicated and large. Ta.

The object of this invention is to provide an actuator that can operate in multiple strokes using one diaphragm, has a simple overall structure, and can be made compact.

[Means for solving problems]

In order to achieve the above object, this invention provides a diaphragm in a housing, divides the interior into a negative pressure chamber and a positive pressure chamber, and includes an urging member for urging the diaphragm into the negative pressure chamber, In an actuator that moves the diaphragm and a rod connected to the diaphragm based on the pressure difference between the negative pressure chamber and the positive pressure chamber and the elastic force of the biasing member, the diaphragm is located on the negative pressure chamber side,
A valve member formed of an elastic material into a substantially cylindrical shape with a bottom and having an inward seal portion attached to an opening side end is provided, at a position facing the valve member of the housing on the negative pressure chamber side, a first nipple whose tip portion protrudes toward the seal portion, a second nipple on the negative pressure chamber side of the housing, a substantially cylindrical plunger provided on the positive pressure chamber side of the diaphragm; A valve that is opened and closed in stages by the plunger is provided at a position facing the plunger of the housing on the positive pressure chamber side, and this valve is connected to a fourth nipple provided in the housing, and the first nipple is connected to a solenoid. The second nipple and the third nipple provided in the housing on the positive pressure chamber side are connected to a pressure supply source through a pressure control circuit consisting of a valve, and the second nipple and a third nipple provided in the housing on the positive pressure chamber side are connected to the pressure supply source through a pressure control circuit consisting of a throttle and a solenoid valve. The actuator is connected to a supply source, and the fourth nipple is connected to the atmosphere through a pressure control circuit including a solenoid valve.

[Effect]

By adopting the above-mentioned means, this idea
First, when negative pressure is supplied from the pressure supply source, only the first nipple is connected to the pressure supply source by the control circuit, so negative pressure is supplied to the negative pressure chamber via the first nipple, and one , the other nipples are left open to the atmosphere.

As a result, the diaphragm is raised against the biasing member by the supplied negative pressure.

Then, when the diaphragm rises, the valve assembly provided on the diaphragm rises together with the first valve assembly.
acting on the nipple to adjust the opening degree of the first nipple to adjust the negative pressure supplied to the negative pressure chamber, and the diaphragm is held in a raised position in equilibrium with the flow rate flowing in through the throttle and the second nipple. Ru.

Also, when the pressure control circuit closes the second nipple, the diaphragm rises further to maintain the valve assembly in a position that fully closes the first nipple.

Furthermore, when positive pressure is supplied from the pressure supply source, only the third nipple is connected to the pressure supply source by the pressure control circuit, so that positive pressure is supplied into the positive pressure chamber via the third nipple, and one , the other nipples are left open to the atmosphere.

Then, the diaphragm rises against the biasing member, causing the plunger to rise together to bring the valve into a predetermined open state, and the diaphragm is maintained at the raised position in equilibrium with the flow rate discharged from the fourth nipple via the valve. be done.

Also, when the pressure control circuit closes the fourth nipple, the diaphragm is held in a further raised position.

The rod moves together with the diaphragm both when the pressure is negative and when the pressure is positive.

〔Example〕

Embodiments of this invention shown in the drawings will be described below.

FIG. 1 shows an actuator according to this invention, in which the outer peripheral edge of a diaphragm 3 is sandwiched between the opening edges 1a and 2a of an upper housing 1 and a lower housing 2, and the upper housing 1 and the diaphragm 3 are A pressure chamber 4 is formed between the lower housing 2 and the diaphragm 3, and a pressure chamber 5 is formed between the lower housing 2 and the diaphragm 3.

Inside the pressure chamber 4, an upper support plate 10 is provided on the upper surface of the diaphragm 3, and a central hole 9a communicating with the valve member 7 and the inner chamber 7a of the valve member 7 is provided in the upper part of the upper support plate 10.
A guide member 9 is provided, and a pressure spring 11 is provided between the guide member 9 and the upper housing 1.

Further, in the pressure chamber 5, a lower support plate 12 is disposed such that the lower surface of the diaphragm 3 has a predetermined distance from the lower upper surface of the lower housing 2.

The upper support plate 10 and the diaphragm 3
and the lower support plate 12, the upper end portion of which passes through and is fixed thereto, and is inserted through the center hole 2b of the lower housing 2 via the shaft seal 20, and whose axis line extends between the chamber 7a of the valve member 7 and the guide member 9.
A downwardly extending rod 6 is disposed in alignment with the axis of the central hole 9a.

Further, the upper housing 1 includes a chamber 7a of the valve member 7 and a central hole 9 of the guide member 9.
The first hole has an axis that coincides with the axis of a, and has a smaller diameter than the center hole 9a of the guide member 9 and a larger diameter than the seal portion 7b formed at the opening edge of the chamber 7a of the valve member 7. A nipple 8 is provided, this first nipple 8 being connected to the upper housing 1.
The movement can be adjusted in the axial direction by adjusting the screw engagement.

Further, a second nipple 13 is provided at an arbitrary location of the upper housing 1 other than the location where the first nipple 8 is provided, which penetrates the upper housing 1 and communicates the pressure chamber 4 with the outside. .

On the other hand, the lower housing 2 is provided with a third nipple 14 that communicates the pressure chamber 5 with the outside. A fourth nipple 17 is provided within which is provided a valve 16 which is opened and closed by a stage plunger 15.

A guide portion 18 having a hole 18a into which the tip portion 15a of the plunger 15 can enter is located below the valve 16 in the fourth nipple 17, and the lower support plate 12 is supported by a spring 19. It is biased upward.

Then, the first nipple 8 and the second nipple 1
3, third nipple 14, and fourth nipple 17
Each has an atmosphere open position (position),
Solenoid valves SV-1, SV-2, SV-3 that can be switched between communication positions (positions),
and SV-4 are connected, and the second nipple 1
3 and solenoid valve SV-2, and between the third nipple 14 and solenoid valve SV-3.
Apertures 22 and 21 are provided between the two.

The solenoid valves SV-1 and SV-2 are connected via a pipe A, and the solenoid valve SV-3 is connected via a pipe B to an intake manifold that is a pressure supply source.

In addition, each solenoid valve SV-1, SV-
2, SV-3, and SV-4 constitute a pressure control circuit together with a well-known circuit for operating them.

Next, the operation of the above will be explained.

First, under normal conditions, the diaphragm 3 is pressed by the pressure spring 11.
The lower support plate 12 provided on the diaphragm 3 is held in contact with the lower housing 2.

At this time, the tip 1 of the two-stage plunger 15
5a has entered into the hole 18a of the guide portion 18, and the rod 6 has protruded downward as shown in FIG.

In this case, the first
The lower end of the nipple 8 and the seal portion 7 of the valve member 7
The distance from the lower end of b is d1.

Note that the distance between the lower end of the seal portion 7b of the valve member 7 and the bottom surface of the inner chamber 7a is d (see FIG. 2).

When negative pressure is applied from the intake manifold in the above state, the control circuit controls each solenoid valve SV-2, SV-
3, and SV-4 as positions, and
Set solenoid valve SV-1 to position.

Then, when the negative pressure from the intake manifold is introduced into the first nipple 8 through the pipe A, the atmosphere flowing from the second nipple 13 is passed through the throttle 22.
, the negative pressure inside the pressure chamber 4 increases, and the diaphragm 3 rises against the biasing force of the pressure spring 11 due to the pressure difference between the pressure chambers 4 and 5. .

Then, a first
The lower end of the nipple 8 has changed from the state shown in FIG.
When the state shown in the figure is reached, based on the relationship between the flow rate passing through the gap area between the valve member 7 and the tip of the first nipple 8 and the flow rate flowing in through the throttle 22, it is determined that the valve member 7 and The diaphragm 3 stops in that state, and therefore the stroke of the rod 6 rising is d1.

Next, when the solenoid valve SV-2 is set to the position while the solenoid valve SV-1 remains in the position, the second nipple 13 communicates with the pipe A, so the pressure chamber 4 Negative pressure is introduced into the interior of the diaphragm 3, and the pressure difference with the pressure chamber 5 is further increased, causing the diaphragm 3 and the rod 6 to rise.

Therefore, the valve member 7 rises from the state shown in FIG. 3 to the state shown in FIG.
When the lower part of the nipple 8 comes into contact with the bottom surface of the inner chamber 7a, further upward movement is stopped.

As a result, the diaphragm 3 and the rod 6 are raised by the stroke d simply by switching the position of the solenoid valve SV-2 from the position to the position, and therefore the entire distance d1+d from the initial state. Only the stroke will rise.

Then, in the state shown in Figure 4, the solenoid valve
When the SV-2 position is switched to the SV-2 position, the diaphragm 3 and the rod 6 move down by the stroke d, and the solenoid valve SV
When the -1 position is changed to the -1 position, the diaphragm 3 and the rod 6 descend by a stroke d1 and return to the state shown in FIG. 2, that is, the initial state.

In the case of operating as described above, the stroke d1 can be changed because the first nipple 8 is movably arranged through the upper housing 1.

Next, a case where positive pressure is applied from the intake manifold will be explained.

First, as in the case where negative pressure is applied, the diaphragm 3 is normally urged upward by the pressure spring 11, and the lower support plate 12 is held in the normal state in contact with the bottom surface of the lower housing 2. At this time, the tip portion 15a of the two-stage plunger 15
is located within the hole 18a of the guide portion 18, and the valve 16 is in a closed state.

In the above state, the solenoid valves SV-1, SV-2, and SV-4 are set to the position, and the solenoid valve SV-3 is set to the position.

As a result, positive pressure from the intake manifold is introduced into the pressure chamber 5 through the pipe B and the throttle 21 and the third nipple 14.

Then, the diaphragm 3 and the rod 6 rise due to the pressure difference between the pressure chamber 4 and the pressure chamber 5, and the diaphragm 3 and the rod 6 rise.
A gap is created between the stage plunger 15 and the valve 16, and the pressure inside the pressure chamber 5 is released from there through the hole 18a of the guide portion 18 to the atmosphere via the fourth nipple 17 and the solenoid valve SV-4. be done.

From the relationship between this discharge amount and the throttle 21 provided on the inflow side of the solenoid valve SV-3, the increased stroke is maintained at L1 as shown in FIG.
Therefore, the diaphragm 3 and the rod 6 are held at a position elevated by L1 from the initial state shown in FIG.

Next, when the solenoid valve SV-4 is switched to the closed position, the second
The fourth nipple 17 and the solenoid valve SV are connected through the gap between the stage plunger 15 and the valve 16.
-4, which was being released into the atmosphere.

Therefore, the positive pressure introduced into the pressure chamber 5 through the pipe B causes the diaphragm 3 and the rod 6 to further rise to the stroke L2 shown in FIG.

Further, when the solenoid valve SV-4 is set to the position, the pressure inside the pressure chamber 5 is released to the atmosphere through the gap between the two-stage plunger 15 and the valve 16, as described above.
The diaphragm determines the relationship between the inflow amount that flows into the pressure chamber 5 through the throttle 21 and the outflow amount that is discharged from the pressure chamber 5 to the atmosphere through the gap between the two-stage plunger 15 and the valve 16. 3 and the rod 6 are held at the stroke L1 position as shown in FIG.

Further, when the solenoid valve SV-3 is set to the position and the connection with the intake manifold is stopped, the initial state shown in FIG. 1 is restored.

Note that the float L1 is connected to the tip portion 15a of the two-stage plunger 15 and the hole 18a of the guide portion 18.
The stroke L2 can be determined arbitrarily depending on the relationship between the gap between the
The lower end of the first nipple 8 is connected to the valve member 7.
It can be determined arbitrarily up to the point where it comes into contact with the bottom surface of the inner chamber 7a.

Therefore, it is also possible to make the strokes d and d1 at the time of negative pressure the same as the stroke L2.

[Effect of idea]

By configuring this idea as described above,
Whether the pressure supply source is negative pressure or positive pressure, the stroke of the rod can be changed by displacing the diaphragm in multiple steps and switching the protruding position of the rod provided on it. Moreover, since only one diaphragm is needed, the whole structure can be made simple and inexpensive, and the whole structure can be made smaller.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a schematic vertical sectional view showing the whole, and FIGS. 2, 3, and 4 show the first nipple, the guide member, and the guide member when negative pressure is applied. 5 and 6 are schematic longitudinal sectional views showing the relationship among the valve members, and FIGS. 5 and 6 are schematic longitudinal sectional views showing the relationship among the two-stage plunger, the valve, and the guide section when positive pressure is applied. 1... Upper housing, 2... Lower housing, 3... Diaphragm, 4, 5... Pressure chamber, 6
... Rod, 7 ... Valve member, 7a ... Inner chamber,
7b... Seal part, 8... First nipple, 9...
Guide member, 9a... Central hole, 10... Upper support plate, 11, 19... Pressing spring, 12... Lower support plate, 13... Second nipple, 14... Third nipple, 15... Two stages Plunger, 16...Valve, 1
7... 4th nipple, 18... Guide section, SV-1,
SV-2, SV-3, SV-4... Solenoid valve.

Claims (1)

[Scope of utility model registration request] A diaphragm 3 is provided within the housings 1 and 2,
The interior is divided into a negative pressure chamber 4 and a positive pressure chamber 5, and a biasing member 11 for biasing the diaphragm 3 is provided in the negative pressure chamber 4. In an actuator that moves the diaphragm 3 and the rod 6 connected to the diaphragm 3 by the pressure difference and the elastic force of the biasing member 11, a bottomed bottom made of an elastic material is provided on the negative pressure chamber 4 side of the diaphragm 3. A valve member 7 formed into a substantially cylindrical shape and having an inward seal portion 7b attached to the opening side end.
The housing 1 on the negative pressure chamber 4 side is provided with a first nipple 8 whose tip portion projects toward the seal portion 7b at a position facing the valve member 7, and the housing 1 on the negative pressure chamber 4 side 1st to 2nd
A substantially cylindrical plunger 15 is provided on the positive pressure chamber 5 side of the diaphragm 3, and the plunger 15 is provided at a position opposite to the plunger 15 of the housing 2 on the positive pressure chamber 5 side. The valve 16 is connected to a fourth nipple 17 provided in the housing 2, and the first nipple 8 is connected to a pressure supply source through a pressure control circuit consisting of a solenoid valve. The second nipple 13 and the third nipple 14 provided in the housing 2 on the side of the positive pressure chamber 5 are connected to the pressure supply source via a pressure control circuit consisting of a throttle and a solenoid valve, and the fourth nipple 17 is an actuator characterized in that it is connected to the atmosphere through a pressure control circuit consisting of a solenoid valve.