JPH0338440B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a technique suitable for application to an ejector device that supplies a working fluid such as compressed air to obtain negative pressure.

[Conventional technology]

For example, in an ejector device that obtains negative pressure using an ejector consisting of a nozzle and a differential user, a solenoid valve that controls the supply and stop of supply of compressed air as the working fluid is used to reduce the length of the device. It is conceivable to arrange the axes of the ejector so that they intersect with the axial direction of the nozzle of the ejector.

[Problem that the invention seeks to solve]

However, with a structure in which the axis of the solenoid valve crosses the axis of the ejector as described above, it is unavoidable that the width dimension increases due to the solenoid of the solenoid valve. There is a problem in that when a set of an ejector and a solenoid valve are installed side by side, the space required for installation becomes larger than necessary.

Furthermore, the flow path between the electromagnetic valve and the ejector becomes complicated, and the pressure loss of the compressed air as the working fluid to the ejector becomes relatively large, resulting in a problem that the efficiency of generating negative pressure in the ejector is reduced.

An object of the present invention is to provide an ejector device whose width can be reduced.

Another object of the present invention is to provide an ejector device that can be easily and reliably mounted on a manifold.

Still another object of the present invention is to provide an ejector device that can reduce power consumption.

[Means for solving problems]

The ejector device of the present invention includes at least an ejector including a nozzle and a differential user, and a plunger that drives a valve body of a solenoid valve that controls the supply and stop of supply of working fluid to the ejector, and the ejector and a solenoid valve, which is provided in each of the first and second blocks that are connected to each other, and communicates with the ejector and a working fluid supply port that supplies working fluid to the ejector via the solenoid valve, so that the working fluid is generated in the ejector. A vacuum port for transmitting negative pressure to the outside is provided on the same side of the first and second blocks.

[Effect]

According to the above means, the solenoid that biases the plunger that drives the valve body of the solenoid valve does not protrude in the width direction, so the width dimension can be reduced, and the working fluid supply port and vacuum port are , the solenoid valve, and the ejector are provided on the same side of the first and second blocks on which they are respectively mounted, so that they can be easily and reliably mounted on a manifold or the like.

In addition, since there is no need to form a vent such as a vent in the plunger that constitutes the solenoid valve, the entire cross section of the plunger can be effectively used for the passage of the magnetic flux that generates thrust, and the control of the ejector device is improved. It is possible to reliably reduce the power consumption of the solenoid valve.

Embodiment 1 FIG. 1 is a side sectional view of an ejector device that is an embodiment of the present invention.

The ejector device of this embodiment includes a first block B1 having an ejector mechanism 1 built therein, and a first block B1.
The ejector mechanism 1 is integrally connected to the block B1 of the ejector mechanism 1, and has a rectangular outer shape in the direction perpendicular to the axis and has approximately the same dimensions as the block B1. A second block B2 is provided with a solenoid valve 2 to be controlled.

The second block B2 is integrally fixed to the first block B1 by a plurality of fixing bolts 3.

The ejector mechanism 1 provided inside the first block B1 includes a differential user 1a and a nozzle 1b coaxially connected to the differential user 1a, and injects compressed air in the direction of the differential user 1a from the nozzle 1b. At this time, due to the so-called Ventilly effect, the differential user 1a and the nozzle 1b
The structure is such that negative pressure is generated at the connecting portion 1c.

Further, a vacuum port 4 communicating with the connecting portion 1c is opened on one side of the first block B1.

On the other hand, the solenoid valve 2 provided in the second block B2 includes a yoke 2a that is in close contact with the end face of the second block B2, and a fluid chamber A is formed between the yoke 2a and the second block B2. is formed.

The yoke 2a is stably fixed by being sandwiched between the cover 2b and the second block B2, which are in contact with the end portion of the yoke 2a.

Further, the ejector mechanism 1 is provided on the yoke 2a.
A bobbin 2c is held coaxially with the bobbin 2c, and a solenoid 2d formed by winding a conductive wire or the like around the bobbin 2c is held.

Inside the bobbin 2c, a plunger 2 is disposed coaxially with the ejector mechanism 1, has an outer end protruding toward the fluid chamber A, and is slidable in the axial direction.
e, and a fixed core 2f that faces the inner end of the plunger 2e at a predetermined distance and whose outer end is locked to the yoke 2a.

Inside the second block B2, one end is opened facing the plunger 2e in the fluid chamber A;
A working fluid supply port 5 whose other end is opened on the same side as the vacuum port 4 in the first block B1 is formed, and around the opening in the fluid chamber A, an outer end of the plunger 2e is formed. A valve seat 6 is provided protrudingly from which the valve body 2g engaged with the valve seat 6 is brought into contact and separated.

A valve spring 2h is interposed between the outer end of the plunger 2e and the end surface of the yoke 2a, and the plunger 2e is urged in a direction to bring the valve body 2g into close contact with the valve seat 6.

Inside the second block B2, a plurality of working fluid passages 7 are linearly formed parallel to the axial direction of the plunger 2e of the electromagnetic valve 2 and the ejector mechanism 1, which are arranged coaxially. One end of the fluid passage 7 is communicated with the fluid chamber A, and the other end is communicated with the inlet portion 1d of the ejector mechanism 1.

A plunger pin 8 having an outer diameter smaller than the inner diameter of the working fluid passages 7 is inserted into each of the plurality of working fluid passages 7 .

One end of the plunger pin 8 is brought into contact with the peripheral part of the valve body 2g at the outer end of the plunger 2e, and the other end is brought into contact with a flapper 9 provided inside the inlet part 1d of the ejector mechanism 1. There is.

A flapper spring 10 having a smaller urging force than the valve spring 2h is interposed between the flapper 9 and the end face of the nozzle 1b of the ejector mechanism 1.
The plunger 2e is urged away from the valve seat 6 via a plurality of plunger pins 8.

The periphery of the solenoid 2d is sealed with a housing 2j made of, for example, resin.
The solenoid 2d is protected from external moisture and dust.

Further, a power supply cable 2k that passes through the housing 2j is connected to the solenoid 2d, and is configured to be supplied with a predetermined electric power from the outside.

A guide hole 11 is formed on the side of the outer end of the plunger 2e that protrudes into the fluid chamber A, and inside the guide hole 11 there is provided a guide hole 11 that is movable in the axial direction.
A push pin 12 is provided with a tapered inner end facing the tip of the plunger 2e.

A return spring 13 is interposed between the second block B2 and the different diameter portion of the push pin 12, and the return spring 13 biases the push pin 12 in a direction to project outside.
2 is stopped at a position where the different diameter portion is engaged with a stopper pin 14 that penetrates through the guide hole 11 eccentrically.

Then, by pushing the push pin 12 into the second block B2 from the outside against the biasing force of the return spring 13, the tapered part of the inner end of the push pin 12 is pushed closer to the tip of the plunger 2e. The valve body 2g is abutted from the side and is locked to the plunger 2e.
It is possible to remove the valve from the valve seat 6.

In the second block B2, the ejector mechanism 1
In the exhaust passage 1e on the exit side of the differential user 1a,
The external dimension in the direction perpendicular to the axis is approximately the same as that of blocks B1 and B2, and a muffler 15 containing a porous sound absorbing material is connected inside, and the damper 15 is directly compressed to the outside from the diffuser 1a. The generation of noise caused by air blowing out is prevented.

The operation of this embodiment will be explained below.

First, when the solenoid 2d of the electromagnetic valve 2 is in a de-energized state, the plunger 2 is
e is biased in the direction of protruding into the fluid chamber A, and the valve body 2
g comes into close contact with the valve seat 6, the working fluid supply port 5 is closed, and the supply of working fluid such as compressed air to the ejector mechanism 1 is stopped.

Next, when the solenoid 2d is energized and a magnetic field is formed inside the bobbin 2c, the plunger 2e is attracted toward the fixed core 2f by the magnetic force against the urging force of the valve spring 2h, and the valve body 2g is removed from the valve seat 6.

At this time, the plunger 2e is assisted by a flapper spring 10 via a plurality of plunger pins 8 and flappers 9 that are in contact with the outer end, and even when the biasing force of the valve spring 2h is relatively large, the displacement of the plunger 2e The separation of the valve body 2g from the valve seat 6 is performed with good responsiveness to the energization operation to the solenoid 2d.

In addition, since the plunger 2e has a solid structure with no passages, the entire cross section can be used to pass the magnetic flux that generates an attractive force between it and the fixed core 2f, and the electromagnetic valve 2 can be operated with less power consumption. Stable and reliable operation can be achieved.

When the valve body 2g separates from the valve seat 6, the compressed air supplied from the outside to the working fluid supply port 5 passes through the fluid chamber A and the working fluid passage 7 in order and flows into the nozzle 1b of the ejector mechanism 1. , the high-speed airflow ejected from this nozzle 1b to the differential user 1a causes the nozzle 1b and the differential user 1 to
Negative pressure is generated at the connecting portion 1c with a, and this negative pressure is transmitted to a predetermined device (not shown) via the vacuum port 4.

In addition, the compressed air ejected from the differential user 1a of the ejector mechanism 1 to the exhaust path 1e passes through the muffler 15 and is quickly discharged to the outside without making a large noise.

Here, in this embodiment, the ejector mechanism 1 provided inside the first block B1 and the second
Since the plunger 2e of the solenoid valve 2 provided in the block B2 is arranged coaxially with the plunger 2e, the solenoid 2d for driving the plunger 2e does not protrude in the width direction. can be reduced.

Furthermore, since the path of the working fluid passage 7 that supplies working fluid such as compressed air from the solenoid valve 2 to the ejector mechanism 1 can be made straight, the route of the working fluid passage 7 that supplies working fluid such as compressed air from the solenoid valve 2 to the ejector mechanism 1 can be It becomes possible to reduce pressure loss, and the efficiency of generating negative pressure in the ejector mechanism 1 can be improved.

Further, since the vacuum port 4 opened in the first block B1 and the working fluid supply port 5 opened in the second block B2 are opened on the same side, the vacuum port 4 opened in the first block B1 and the working fluid supply port 5 opened in the second block B2 are Block B2 can be easily mounted on a manifold (not shown) or the like.

Embodiment 2 FIG. 2 is a side sectional view of an ejector device according to another embodiment of the present invention.

In the second embodiment, the working fluid supply port 5a and the vacuum port 4, which supply compressed air to the ejector mechanism 1 via the electromagnetic valve 2 provided in the second block B2, are connected to the ejector mechanism 1. 1st
This differs from the first embodiment in that it is concentrated on the block B1 side.

As a result, the same effects as in the first embodiment can be obtained, and since it can be mounted on a manifold (not shown) only via the first block B1, the manifold can be made smaller.

Embodiment 3 FIG. 3 is a side sectional view showing still another embodiment of the present invention.

In the third embodiment, there is a block at a position opposite to the second block B2 via the first block B1, the external dimension in the direction perpendicular to the axis is approximately the same as that of the blocks B1 and B2, and the vacuum port 4a is located at a position opposite to the second block B2. The third block B3 equipped with a solenoid valve 16 for controlling the release of negative pressure is connected integrally with the ejector mechanism 1 so that the solenoid valve 16 is coaxial with the ejector mechanism 1, unlike in the first embodiment. They are different.

The structure of the electromagnetic valve 16 is almost the same as that of the electromagnetic valve 2 described above, and a description of its structure will be omitted to avoid duplication, and in the following explanation, the same lowercase letters will be used for corresponding parts. I will quote it.

That is, a working fluid passage 17 is formed inside the third block B3, and this working fluid passage 1
One end of 7 is connected to a working fluid passage 18 formed through the first block B1 and a second block B1.
The working fluid supply port 5a is connected to the working fluid supply port 5a through the working fluid passage 19 formed inside the
The other end opens into the fluid chamber A1 formed between the yoke 16a of the solenoid valve 16 provided in the third block B3 and the third block B3, and around the opening, there is a valve seat. 6a is provided protrudingly.

Further, inside the third block B3, a vacuum breaking path 20 is formed, one end of which opens around the valve seat 6a in the fluid chamber A1.

The other end of this vacuum breaking path 20 is communicated with the vacuum port 4a via a vacuum breaking path 20a formed in the first block B1.

Working fluid passage 17 in third block B3
The path includes a body 21a screwed onto the third block B3, a needle 21b whose inner end forms a tapered portion 21c and screwed onto the body 21a,
Flow rate adjustment mechanism 2 consisting of lock nut 21d etc.
1 is interposed, and by appropriately rotating the needle 21b from the outside to change the distance between the tapered portion 21c and the working fluid passage 17, the fluid passes through the working fluid passage 17 and is supplied to the solenoid valve 16. The flow rate of the working fluid applied is adjustable.

Then, at any time, the solenoid valve 16 is energized, and the valve seat 6a is
By disengaging the valve body 16g that is locked to the plunger 16e from the working fluid passage 19,
Working fluid passage 18, working fluid passage 17, fluid chamber A
1. A predetermined flow rate of compressed air is introduced into the vacuum port 4a through the vacuum break path 20 and the vacuum break path 20a, and the negative pressure state of the vacuum port 4a is quickly released.

Furthermore, when it is necessary to break the vacuum at the vacuum port 4a, the solenoid valve 16 is opened for the necessary time and compressed air is introduced from the working fluid supply port 5a to the vacuum port 4a. The amount of compressed air can be kept to a minimum.

In this embodiment as well, the plunger 16e of the solenoid valve 16 is disposed coaxially with the ejector mechanism 1, so a vacuum breaking function is added to release the negative pressure in the vacuum port 4a without increasing the width or the like. can do.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various changes can be made without departing from the spirit thereof.

〔Effect of the invention〕

(1) At least an ejector consisting of a nozzle and a differential user, and a plunger that drives a valve body of a solenoid valve that controls supply and stop of supply of working fluid to the ejector are coaxially arranged,
The ejector and the solenoid valve are respectively provided in the first and second blocks that are connected to each other,
a working fluid supply port that supplies working fluid to the ejector via the solenoid valve; and a working fluid supply port that communicates with the ejector;
Since the vacuum port for transmitting the negative pressure generated in the ejector to the outside is opened on the same side of the first and second blocks, the solenoid for operating the plunger does not protrude in the width direction. The overall width dimension can be reduced, and mounting on the manifold can be easily and reliably performed without causing fluid leakage.

As a result, by reducing the width dimension and mounting a plurality of ejector devices densely on the manifold, the installation space can be significantly reduced.

(2) As a result of (1) above, the path of the working fluid passage that supplies working fluid such as compressed air from the solenoid valve to the ejector mechanism becomes straight, and the pressure of compressed air etc. supplied from the solenoid valve to the ejector mechanism becomes straight. Loss is reduced, and the efficiency of generating negative pressure in the ejector mechanism can be improved.

(3) There is no need to perform any processing such as drilling a passage on the plunger of the solenoid valve used to control the ejector, and the entire cross-sectional area of the plunger is used for passing the magnetic flux to generate an attractive force in the plunger. Therefore, it is possible to use a solenoid valve with a smaller rating, reduce the power consumption of the solenoid valve, and realize accurate control operation.

(4) Connect the vacuum port and working fluid supply port to
By concentrating on the first and second blocks, it is possible to downsize the manifold on which the first and second blocks are mounted.

(5) The first block is equipped with an ejector, and the third block is coaxial with the ejector mechanism and is equipped with a solenoid valve that controls the release of negative pressure at the vacuum port.
By connecting the blocks, it is possible to add a vacuum breaking function to release the negative pressure in the vacuum port without increasing the width or the like. This makes it possible to arbitrarily control vacuum suction and vacuum break at the vacuum port, allowing the ejector device to be used in a wider variety of applications.

In addition, when vacuum breaking is required, compressed air can be supplied to the vacuum port for the required time (amount), and compressed air is not wasted more than necessary when breaking the vacuum. Economical.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of an ejector device that is an embodiment of the present invention, FIG. 2 is a side sectional view of an ejector device that is another embodiment of the present invention, and FIG. 3 is a side sectional view of an ejector device that is another embodiment of the present invention. FIG. 2 is a side cross-sectional view of an example ejector device. 1...Ejector mechanism, 1a...Diff user,
1b...Nozzle, 1c...Connection part, 1d...Inlet part, 1e...Exhaust path, 2...Solenoid valve, 2a...Yoke, 2b...Cover, 2c...Bobbin, 2d...
...Solenoid, 2e...Plunger, 2f...Fixed core, 2g...Valve body, 2h...Valve spring, 2j...
...Housing, 2k...Power cable, 3,3a
...Fixing bolt, 4, 4a...Vacuum port, 5,
5a... working fluid supply port, 6, 6a... valve seat, 7... working fluid passage, 8... plunger pin, 9... flapper, 10... flapper spring, 1
1... Guide hole, 12... Push pin, 13... Return spring, 14... Stopper pin, 15... Silencer,
16...Solenoid valve, 16a...Yoke, 16b...
Cover, 16c...Bobbin, 16d...Solenoid, 16e...Plunger, 16f...Fixed core, 16g...Valve body, 16h...Valve spring, 16j
...Housing, 16k...Power cable, 17
... Working fluid passage, 18 ... Working fluid passage, 19
... Working fluid passage, 20, 20a ... Vacuum breaking path, 21 ... Flow rate adjustment mechanism, 21a ... Body,
21b...needle, 21c...tapered portion, 21
d...Lock nut, A, A1...Fluid chamber, B1
...First block, B2...Second block,
B3...Third block.

Claims (1)

[Scope of Claims] 1. At least an ejector consisting of a nozzle and a differential user, and a plunger that drives a valve body of a solenoid valve that controls supply and stop of supply of working fluid to the ejector are disposed coaxially, and the ejector and the solenoid valve is provided in each of the first and second blocks that are connected to each other, and is connected to a working fluid supply port that supplies working fluid to the ejector via the solenoid valve, and is in communication with the ejector. An ejector device characterized in that a vacuum port for transmitting negative pressure generated in the ejector to the outside is opened on the same side of the first and second blocks. 2. A third block is connected to the first block provided with the ejector and provided with a solenoid valve coaxial with the ejector for controlling release of negative pressure in the vacuum port. An ejector device according to claim 1.