JP2585525Y2 - Ejector device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector device for generating a negative pressure by supplying a working fluid such as compressed air.

[0002]

2. Description of the Related Art An ejector device generates a negative pressure by flowing compressed air from an air supply port to an exhaust port provided in a main body of the ejector device and sucking air into a diffuser provided between the two ports. FIG. 5 schematically shows an example of a conventional ejector device.

The ejector body 1 has an air supply port 2a and an exhaust port 2b for discharging the compressed air flowing from the air supply port 2a, and a diffuser (not shown) is provided between these ports. Further, the ejector body 1 has a suction port 2c for sucking air into the diffuser. Compressed air from a pneumatic source (not shown) is supplied to a working fluid supply port 3 and a working fluid flow path 4.
The air is supplied to the air supply port 2a through the muffler 5 and discharged to the outside. A solenoid valve 6 for controlling supply air is provided to open and close the working fluid flow path 4.

[0004] A negative pressure device such as a vacuum cup V is connected to the suction port 2c by a vacuum flow path 7, and guides a flow toward the ejector main body 1 to the vacuum flow path 7 to prevent a flow in the opposite direction. A check valve 8 is provided. Further, the vacuum flow path 7 is connected to the working fluid supply port 3 by a vacuum breaking flow path 9, and an electromagnetic valve 10 for controlling vacuum breaking air is provided to open and close the vacuum breaking flow path 9.

[0005]

When a conventional ejector having such a structure is used to convey a work W while sucking a work W by means of a vacuum cup V, for example, the ejector body is energized by energizing a solenoid valve 6. 1. Compressed air is flowed into 1. As a result, the vacuum cup V enters a negative pressure state through the vacuum flow path 7 and can transport the work W while adsorbing it.

[0006] Even if the supply of the working fluid is stopped in a state where the work W is adsorbed to the vacuum cup V and a predetermined degree of vacuum is obtained, air remains in the vacuum cup V by the operation of the check valve 8. Does not flow in, so that the adsorption state is maintained. However, when air leaks into the vacuum cup V during the suction conveyance and the degree of vacuum decreases, the degree of vacuum can be increased by supplying compressed air to the ejector body 1 again. When the work W is transported to a predetermined position by the vacuum cup V, the solenoid valve 10 is energized to remove the work W from the vacuum cup V. Thereby, the compressed air is supplied into the vacuum cup V, and the vacuum in the cup V is broken,
The work W is removed from the vacuum cup V. Work W
Is removed when the body 1 is operating or when it is stopped.

However, in the conventional ejector device having the above-described structure, even if the vacuum break air control solenoid valve 10 is operated in order to release the negative pressure state in the vacuum cup V, a predetermined timing is required. In some cases, the work W did not come off. The reason for this is that even if the solenoid valve 10 is operated to supply compressed air from the vacuum breaking channel 9 to the vacuum cup V in order to release the negative pressure state in the vacuum cup V, the vacuum breaking channel 9 It is presumed that the compressed air may flow out through the vacuum flow path 7 toward the ejector body 1.

[0008] An object of the present invention is to make it possible to stop the supply of the negative pressure at an accurate timing when the supply of the negative pressure is stopped from the state where the negative pressure is supplied to the negative pressure device. Is to do.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0010]

Means for Solving the Problems Of the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, the ejector device of the present invention has an air supply port to which a working fluid is supplied, an exhaust port from which the working fluid flowing from the air supply port flows out, and a flow opening from the air supply port to the exhaust port. An ejector device having an ejector body provided with a suction port provided therein, and operating a negative pressure device, wherein an on-off valve for opening and closing a working fluid flow path connecting a working fluid supply port and the air supply port; and the suction port. A vacuum flow path having a check valve connected to the suction port for guiding the flow toward the suction port and preventing the flow in the reverse direction, a vacuum breaking flow path connected to the working fluid supply port, the vacuum flow path and the vacuum A position provided between the vacuum channel and the vacuum channel, the vacuum channel communicating with the negative pressure device;
And a three-port switching valve that operates at a position where the vacuum breaking flow path communicates with the negative pressure device. The negative pressure is supplied through the vacuum breaking flow path regardless of whether the ejector is operated or not. It is characterized in that compressed air can be supplied to the equipment.

[0012]

In the ejector device having the above structure, when supplying a negative pressure to the negative pressure device, the working fluid flow path is opened by the on-off valve with the three-port switching valve set to the vacuum supply position. Set to state. Thereby, the negative pressure is supplied to the negative pressure device through the connection port by the operation of the ejector body.

When the supply of the negative pressure is stopped, the three-port switching valve is set to the vacuum breaking position regardless of whether the ejector body is operating or not. This ensures that the fluid supplied from the working fluid supply port through the vacuum breaking channel does not flow into the vacuum channel, but is reliably guided to the negative pressure device at a predetermined timing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on the illustrated embodiments of the present invention. FIG. 1 is a schematic structural view showing an ejector device according to an embodiment of the present invention. An ejector body 1 has an air supply port 2a similar to that shown in FIG.
And an exhaust port 2b through which compressed air as working fluid that flows in from the air supply port 2a flows out. The air supply port 2a is connected to a working fluid supply port 3 to which a pneumatic source (not shown) is connected by a working fluid flow path 4. Compressed air supplied through this flow path 4 is supplied to an exhaust port From 2b, the gas is discharged to the outside through the exhaust passage 11 and the muffler 5.

In order to open and close the working fluid flow path 4, a solenoid valve 6 for controlling supply air is provided in the flow path 4 as an open / close valve. The solenoid valve 6 normally closes two ports of the flow path 4 and connects both ports when energized.

A vacuum flow path 12 is connected to the suction port 2c of the ejector body 1, and a check for guiding the flow toward the ejector body 1 and preventing the flow in the reverse direction is performed in the vacuum flow path 12. A valve 8 is provided, and a filter 13 is provided in the vacuum channel 12 to remove dust in the air flowing therethrough.

A vacuum hose 14 having a vacuum cup V as a vacuum device at the end thereof is selectively connected to a vacuum breaking channel 15 connected to the working fluid supply port 3 and the vacuum channel 12. A solenoid valve 16 for controlling vacuum breaking air is provided as a three-port switching valve between these flow paths. The solenoid valve 16 has a vacuum breaking port 17 a of the vacuum breaking channel 15, a vacuum supply port 17 b of the vacuum channel 12, and a connection port 17 c connected to an external negative pressure device by a negative pressure hose 14. doing.

Normally, the solenoid valve 16 is connected to the connection port 1.
A vacuum supply position for closing the vacuum break channel 15 by connecting the vacuum supply port 17b to the vacuum supply port 17b, and a vacuum break for closing the vacuum supply port 17b by connecting the connection port 17c to the vacuum break port 17a by energization. Operate with position.

When the work W is conveyed using the ejector device having such a structure while sucking the work W by the vacuum cup V as shown in FIG. Thus, compressed air is supplied from the working fluid supply port 3 to the ejector body 1.
As a result, the suction port 2c is in a negative pressure state, and the vacuum cup V is connected through the vacuum passage 12 and the negative pressure hose 14.
Is in a negative pressure state.

A vacuum switch 18 is provided in the vacuum flow path 12, and when it is detected that the degree of vacuum in the vacuum cup V has reached a predetermined degree, the power supply to the solenoid valve 6 is released. However, air leakage is prevented by the check valve 8, and the degree of vacuum in the vacuum cup V is maintained. If the degree of vacuum falls below the set value, the solenoid valve 6 will operate again.

When the workpiece W is transported to a predetermined position by the vacuum cup V, the solenoid valve 16 is energized,
When the solenoid valve 16 is set at the vacuum breaking position, the connection port 1
7c is connected to a vacuum break port 17a,
Will be blocked. Therefore, the compressed air from the working fluid supply port 3 passes through the vacuum breaking channel 15 without being affected by the pressure in the vacuum channel 12 and regardless of the operation and non-operation of the ejector main body 1. The work W is surely supplied to the vacuum cup V at the timing described above, and the work W is released from the suction to the vacuum cup V. At this time, the amount of compressed air flowing through the vacuum breaking channel 15 is adjusted by the flow rate adjusting mechanism 19.

FIG. 2 is a sectional view showing a more specific structure of the ejector device shown in FIG. 1, and FIG. 3 is a state in which the solenoid valve for controlling vacuum breaking air shown in FIG. 2 is at a vacuum supply position. FIG. 4 is a sectional view showing details of the solenoid valve 6 omitted in FIG.

The illustrated ejector device has first and second two blocks B1 and B2, in which an ejector body 1 is formed, and a first block B1 is provided with a second block B2. The flow rate adjusting mechanism 19 is formed in the third block B3 mounted on the opposite side. Further, the third block B3 includes a fourth block B4.
Is attached.

The four blocks B1 to B4 are attached to the manifold M via an adapter A. These blocks B1 to B4 and the blocks and the adapter A are mutually connected by bolts or screws (not shown). Has been concluded.

The ejector body 1 formed inside the first block B1 has a nozzle 20a and a diffuser 20b arranged concentrically with the nozzle 20a. Air supply port 2
When the compressed air supplied to the nozzle a is ejected from the nozzle 20a toward the diffuser 20b, a suction port 2c provided in the connection portion between the diffuser 20b and the nozzle 20a so as to open to the flow of the compressed air by a so-called Venturi effect. Is in a negative pressure state.

In order to guide the compressed air discharged from the exhaust port 2b of the ejector body 1 to the outside, an exhaust passage 11 is formed in the first block B1 and the adapter A, and the compressed air from the exhaust port 2b is formed. Is silenced by the muffler 5 attached to the adapter A, and then flows out of the exhaust port 21 to the outside.

A working fluid supply port 3 connected to a pneumatic source (not shown) is formed in the manifold M, and extends from this port 3 to connect the manifold M, the adapter A, and the second block B2 to a working fluid flow path. 4 are formed. The working fluid flow path 4a formed at a position concentric with the center of the nozzle 20a is connected to the second block B2 via the communication hole 4b.
The working fluid flow path 4 has a valve seat 22 formed at an open end of the working fluid flow path 4a.

A solenoid valve 6 for controlling supply air is attached to the second block B2 at the yoke 6a, and a valve element 6c provided at the tip of a plunger 6b of the solenoid valve 6 is provided.
Is pressed against the valve seat 22. The plunger 6b is axially slidably mounted in a bobbin 6e attached to the yoke 6a, and a fixed core 6f is fitted to the rear end of the bobbin 6e. The bobbin 6e is provided with a solenoid 6d formed by winding a conductive wire or the like around its outer periphery, and its periphery is sealed by a housing 6g made of, for example, resin.

For the solenoid 6d, the housing 6
Feeding cable 6 directly or detachably connected to g
h is supplied with electric power. The outer end face of the solenoid valve 6 is covered with a cover 6i.

A plurality of working fluid flow paths 4c are formed outside the flow path 4a so as to communicate the fluid chamber 23 formed on the tip end side of the plunger 6b with the air supply port 2a of the ejector body 1. ing.

A resilient force is applied to the plunger 6b of the solenoid valve 6 in a direction in which the valve body 6b is pressed against the valve seat 22 by the spring member 27, and when the solenoid 6d is energized, the working fluid The flow path 4a is opened, and compressed air is supplied to the ejector body 1.

A solenoid valve 16 for controlling vacuum breaking air is attached to the fourth block B4 at its yoke 16a, and a plunger 16b of the solenoid valve 16 faces a plunger 6b of the solenoid valve 6. . The electromagnetic valve 16 has the same structure as the electromagnetic valve 6, and the same reference numerals a to i are used for members constituting the electromagnetic valve 16 and members common to the members constituting the electromagnetic valve 6. Is attached.

The opening of the vacuum break port 17a formed in the block B4 is opposed to the valve 16c provided at the tip of the plunger 16b of the solenoid valve 16, and the valve 16
A valve seat 30 against which c is pressed is provided. The vacuum breaking port 17a branches from the working fluid flow path 4 and communicates with the working fluid supply port 3 through a vacuum breaking flow path 15 formed in the blocks B1 to B4. However, the vacuum breaking channel 15 may be directly connected to the working fluid supply port 3 or may be connected to a pneumatic source.

The fourth block B4 includes a vacuum breaking port 1
7a and the vacuum supply port 17b
Is formed, and a valve body 32 that comes into contact with a valve seat 31 formed at the opening of the port 17b is disposed in the block B4. A plunger pin 33 is mounted in the block B4 so as to be slidable in the axial direction in order to make the distance between the two valve bodies 16c and 32 constant and to make them interlock. Although only one plunger pin 33 is shown in FIG. 2 for convenience in drawing, a plurality of plunger pins 33 are mounted in an actual ejector device.

A spring member 34 for urging the valve body 32 in the direction of closing the vacuum supply port 17b is mounted between the valve body 32 and the retainer 35. A spring member 36 for urging a strong elastic force against the valve body 16c in a direction to close the vacuum breaking port 17a is mounted on the plunger 16b. Therefore, when the solenoid 16d is not energized, the valve body 16c closes the vacuum break port 17a, while the plunger pin 33 moves the valve body 32 away from the valve seat 31, as shown in FIG. The vacuum port 17b is opened. When power is supplied to the solenoid 16d,
Since the plunger 16b moves backward, as shown in FIG. 2, the valve body 16c separates from the valve seat 30 to open the vacuum breaking port 17a, and the valve body 32 presses against the valve seat 31 to press the vacuum supply port. 17b is closed.

The vacuum supply port 17b is connected to blocks B1 and B
The vacuum flow path 12a formed in the block B1, the adapter A, and the manifold M communicates with the suction port 2c of the ejector main body 1 and communicates with the vacuum flow path 12a formed in the block B1 and the adapter B. A is communicated with the vacuum flow path 12a through a vacuum flow path 12c formed outside the annular seal member 40 disposed between
The vacuum flow paths 12 shown in FIG. 1 are formed by these vacuum flow paths 12a to 12c.

In the adapter A, there is provided a check valve 8 which allows the flow toward the suction port 2c in the vacuum flow path 12b and prevents the flow in the reverse direction. Further, a filter 13 for capturing foreign matter such as dust flowing in the vacuum flow path 12b is incorporated in the manifold M. The filter 13 is detachably held by a lid 41 screwed to the manifold M.

The vacuum break port 17a is operated by the solenoid valve 16.
A connection port 17c communicating with any one of the vacuum supply port 17b and the vacuum supply port 17b is formed in the fourth block B4.
And so on. The position of the connection port 17c is not limited to the fourth block B4, but may be any of the blocks B4, B3, B1, the adapter A,
It can be provided at any position by extending the flow path in the manifold M or the like. As the negative pressure device, various devices other than the illustrated vacuum cup V can be used. As shown in FIG. 2, the flow rate adjusting mechanism 19 for adjusting the amount of air flowing through the vacuum breaking channel 15 includes a body 44 fixed to the third block B3 and a screw shaft 45 screwed to the body 44. And a tapered needle 46 for adjusting the opening of the vacuum breaking channel 15 is provided at the tip of the screw shaft 45. Screw shaft 4
A knob 47 is provided at the base end of the lock 5, and a lock nut 48 is screwed to the screw shaft 45.

A push pin 51 is provided on the fourth block B4 so as to be slidable in the axial direction so that the valve body 16c pressed against the valve seat 30 can be manually separated. The push pin 51 is normally at the retreat limit position due to the resilience of the spring member 52, and has a tapered portion 5 at its distal end which comes into contact with the distal end surface of the plunger 16b by forward movement.
3 are formed. The second block B2 includes a solenoid valve 6
In order to separate the valve body 6c from the valve seat 22, a push pin 51a having the same structure as the push pin 51 is provided.

A procedure for operating a negative pressure device using the ejector device shown in FIGS. 2 to 4 will be described. To supply a negative pressure to the negative pressure device, the plunger 6b is moved backward by energizing the solenoid 6d of the solenoid valve 6 against the elastic force of the spring member 27.

As a result, the valve body 6c separates from the valve seat 22 to open the working fluid flow path 4, and the working fluid supply port 3
Is supplied to the air supply port 2a of the ejector body 1.

At this time, as shown in FIG. 3, the solenoid 16d of the solenoid valve 16 is not energized, the valve body 16c is pressed against the valve seat 30, and the valve body 32 is separated from the valve seat 31. The solenoid valve 16 is at the vacuum supply position. Therefore, the suction port 2c opened to the air flow is in a negative pressure state by the high-speed air flow ejected from the nozzle 20a of the ejector body 1 to the diffuser 20b, and the negative pressure is reduced by the vacuum flow path 12 and the negative pressure hose 14 Is supplied to a vacuum cup V as a negative pressure device.

When the vacuum switch 18 detects that the pressure in the vacuum passage 12b has reached a predetermined pressure, the power supply to the solenoid valve 6 is released and the generation of the negative pressure is stopped. At this time, the pressure in the negative pressure device is maintained by the check valve 8.

When the supply of the negative pressure to the negative pressure device is stopped, when the solenoid 16d of the solenoid valve 16 is energized, the solenoid valve 16 is brought to the vacuum breaking position and connected to the vacuum breaking port 17a as shown in FIG. The communication with the port 17c is established. As a result, the compressed air from the working fluid supply port 3 is supplied to the negative pressure device through the vacuum breaking channel 15, so that the negative pressure state is quickly released.

When the negative pressure is released, the valve body 32 is pressed against the valve seat 31 and the communication between the vacuum port 17b and the connection port 17c is released. Does not enter the ejector body 1 side,
The timing for releasing the negative pressure can be set with high accuracy.

It is needless to say that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist thereof.

[0047]

[Effects of the Invention] Of the ideas disclosed in the present application, the effects obtained by typical ones will be briefly described.
It is as follows.

(1) As described above, according to the present invention, the vacuum supply position where the connection port connected to the negative pressure device is connected to the vacuum supply port, and the vacuum break position where the connection port is connected to the vacuum break port. When the negative pressure state of the negative pressure device is released, the vacuum breaking flow path is cut off from the vacuum flow path, and the vacuum breaking flow is applied to the negative pressure device. Only the flow path is in communication.

(2) As a result, when releasing the negative pressure state in the negative pressure device, the vacuum break must be performed at a certain timing regardless of whether the ejector body has been operated or not. As a result, the negative pressure can be released, and the control of the negative pressure device can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic structural view showing an ejector device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a specific structure of the ejector device of the present invention.

FIG. 3 is a cross-sectional view showing a state where the solenoid valve shown in FIG. 2 is at a vacuum supply position.

FIG. 4 is a sectional view showing details of a solenoid valve only partially shown in FIG. 2;

FIG. 5 is a schematic structural view showing a conventional ejector device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ejector main body 2a Air supply port 2b Exhaust port 2c Suction port 3 Working fluid supply port 4 Working fluid flow path 5 Muffler 6 Solenoid valve (open / close valve) for supply air control 7 Vacuum flow path 8 Check valve 9 Vacuum break flow path 10 Solenoid valve 11 Exhaust flow path 12 Vacuum flow path 13 Filter 14 Negative pressure hose 15 Vacuum break flow path 16 Solenoid valve for controlling vacuum break air (3-port switching valve) 17a Vacuum break port 17b Vacuum supply port 17c Connection port 18 Vacuum switch Reference Signs List 19 flow rate adjustment mechanism 20a nozzle 20b diffuser 21 exhaust port 22 valve seat 23 fluid chamber 27 spring member 30 valve seat 31 valve seat 32 valve body 33 plunger pin 34 spring member 35 retainer 36 spring member 40 sealing material 41 lid body 44 body 45 screw Shaft 46 Needle 47 Knob 48 Lock nut 5 Push pin 52 the spring member 53 tapered portion

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04F 5/44 F04F 5/20

Claims (1)

(57) [Scope of request for utility model registration] 1. An air supply port to which a working fluid is supplied, an exhaust port from which a working fluid flowing from the air supply port flows out, and a suction port opened to a flow from the air supply port to the exhaust port are provided. an ejector body possess the, negative pressure
An ejector device for operating a device, comprising: an on-off valve for opening and closing a working fluid flow path connecting a working fluid supply port and the air supply port; and a flow connected to the suction port and heading toward the suction port.
With check valve to guide flow and prevent reverse flow
An empty flow path, a vacuum breaking flow path connected to the working fluid supply port, and a vacuum breaking flow path provided between the vacuum flow path and the vacuum breaking flow path.
A position where the vacuum flow path communicates with the negative pressure device;
Activates the position where the empty breaking flow path communicates with the negative pressure device.
That 3 and a port switching valve, regardless of the operation and non-operation of the ejector, the
Supplying compressed air to the negative pressure device through a vacuum breaking channel.
An ejector device characterized by being obtained .