JPH0663900U - Ejector device - Google Patents

Abstract

(57) [Summary] [Object] To provide an ejector device capable of accurately stopping the supply of negative pressure to a negative pressure device. The ejector main body 1 has an air supply port 2a to which a working fluid is supplied, an exhaust port 2b, and a suction port 2c in which a negative pressure is formed. A working fluid passage 4 that connects the air supply port 2 a and the working fluid supply port 3 is opened and closed by an opening / closing valve 6. The 3-port switching valve 16 is connected to the negative pressure device V via the negative pressure hose 14 and is connected to the connection port 1
7c is connected to the suction port 2c via the vacuum flow path 12 and the vacuum supply position where the connection port 17c is connected to the vacuum supply position.
5 to the working fluid supply port 3 through which it communicates with the vacuum breaking position. This ensures that even if the working fluid is supplied from the vacuum breaking flow path 15 to the negative pressure device V when the supply of the negative pressure to the negative pressure device V is stopped, the working fluid is surely negative at a predetermined timing. It is supplied to the pressure device V.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ejector device that supplies a working fluid such as compressed air to generate a negative pressure.

[0002]

[Prior art]

 The ejector device is a device that generates negative pressure by causing compressed air to flow from the air supply port provided in the main body toward the exhaust port and causing the diffuser part provided between both ports to suck air. 5 schematically shows an example of the ejector device of FIG.

The ejector body 1 has an air supply port 2a and an exhaust port 2b for discharging the compressed air that has flowed in 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 in the diffuser portion. Compressed air from an air pressure source (not shown) is sent to the air supply port 2a through the working fluid supply port 3 and the working fluid flow path 4, and is discharged from the muffler 5 to the outside. A solenoid valve 6 for controlling the supply air is provided to open and close the fluid flow path 4.

A negative pressure device such as a vacuum cup V is connected to the suction port 2c by a vacuum channel 7, which guides a flow toward the ejector body 1 and a flow in the opposite direction. A check valve 8 for blocking is provided. Further, the vacuum flow path 7 is connected to the working fluid supply port 3 by a vacuum break flow path 9, and a solenoid valve 10 for controlling the vacuum break air is provided to open and close the vacuum break flow path 9.

[0005]

[Problems to be solved by the device]

 When the conventional ejector device having such a structure is used to convey the work W while adsorbing the work W by the vacuum cup V, for example, the solenoid valve 6 is energized to flow compressed air into the ejector body 1. As a result, the vacuum cup V is brought into a negative pressure state through the vacuum flow path 7, and the work W can be conveyed while adsorbing it.

Under the condition that the work W is adsorbed to the vacuum cup V and a predetermined degree of vacuum is obtained, even if the supply of the working fluid is stopped, the check valve 8 operates to keep the inside of the vacuum cup V. Since no air flows in, the adsorption state is maintained. However, if air leaks into the vacuum cup V and the degree of vacuum decreases during suction and conveyance, the degree of vacuum can be increased by supplying compressed air to the ejector body 1 again. . When the work W is conveyed 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. As a result, compressed air is supplied into the vacuum cup V, the vacuum in the cup V is broken, and the work W is removed from the vacuum cup V. The work W is removed when the body 1 of the engine is working or when it is stopped.

However, in the conventional ejector device having the above-described configuration, even if the solenoid valve 10 for controlling the vacuum breaking air is operated to release the negative pressure state in the vacuum cup V, The work W may not come off depending on the timing. The reason for this is that even if the solenoid valve 10 is actuated to supply compressed air from the vacuum break flow passage 9 to the vacuum cup V in order to release the negative pressure state in the vacuum cup V, the vacuum break flow is generated. It is presumed that the compressed air from the passage 9 may flow out toward the ejector body 1 through the vacuum passage 7.

An object of the present invention is to enable the negative pressure supply to be stopped at an accurate timing when the negative pressure is stopped from being supplied to the negative pressure device. To do.

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

[0010]

[Means for Solving the Problems]

 Of the devices disclosed in the present application, the outline of a typical one will be briefly described as follows.

That is, the ejector device is open to an air supply port to which the working fluid is supplied, an exhaust port to which the working fluid flowing from the air supply port flows out, and a flow from the air supply port to the exhaust port. And an ejector body provided with a suction port. A working fluid flow path connecting the working fluid supply port and the air supply port is opened and closed by an opening / closing valve. In addition, a vacuum break port of the vacuum break flow path communicating with the working fluid supply port, and a vacuum flow path having a check valve connected to the suction port for guiding the flow toward the suction port and blocking the flow in the opposite direction. A three-port switching valve provided with a vacuum supply port and a connection port connected to the outside has a vacuum supply position for connecting the connection port to the vacuum supply port and a connection for connecting the connection port to the vacuum break port. Operates to vacuum break position.

[0012]

[Action]

 In the ejector device configured as described above, when supplying negative pressure to the negative pressure device, the working fluid flow path is set to the open state by the opening / closing valve with the 3-port switching valve set to the vacuum supply position. To do. As a result, the negative pressure is supplied to the negative pressure device via the connection port by the operation of the ejector main body.

When the supply of the negative pressure is stopped, the 3-port switching valve is set to the vacuum breaking position regardless of whether the ejector body is operating or not. As a result, the fluid supplied from the working fluid supply port through the vacuum break flow path is reliably guided toward the negative pressure device at a predetermined timing without flowing into the vacuum flow path.

[0014]

Embodiments The present invention will be described in detail below 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. The ejector main body 1 is similar to that shown in FIG. 5, and an air supply port 2a and an inflow port from this air supply port 2a. And an exhaust port 2b through which compressed air as the working fluid flows out. The air supply port 2a is connected to a working fluid supply port 3 to which an air pressure source (not shown) is connected by a working fluid flow passage 4, and the compressed air supplied through this flow passage 4 is It is discharged from the exhaust port 2b to the outside through the exhaust passage 11 and the muffler 5.

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

A vacuum channel 12 is connected to the suction port 2c of the ejector main body 1. The vacuum channel 12 guides a flow toward the ejector main body 1 and blocks a flow in the opposite direction. A check valve 8 is provided, and a filter 13 is provided in the vacuum flow path 12 to remove dust in the air flowing therein.

The negative pressure hose 14 provided with a vacuum cup V as a negative pressure device at its tip is selectively connected to the vacuum break flow path 15 connected to the working fluid supply port 3 and the vacuum flow path 12. The electromagnetic valve 16 for controlling the vacuum breaking air is provided as a 3-port switching valve between these flow paths. This solenoid valve 16 has a vacuum break port 17a of the vacuum break flow path 15 described above, a vacuum supply port 17b of the vacuum flow path 12, and a connection port 17c connected to an external negative pressure device by a negative pressure hose 14. Have

This solenoid valve 16 normally has a vacuum supply position in which the connection port 17c is communicated with the vacuum supply port 17b to close the vacuum break flow path 15, and the connection port 17c is vacuum broken by being energized. It operates in a vacuum breaking position in which it communicates with the port 17a and closes the vacuum supply port 17b.

When the ejector device having such a structure is used to convey the work W while adsorbing the work W by the vacuum cup V as shown in the figure, for example, energize only the solenoid valve 6. 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 in a negative pressure state via the vacuum flow path 12 and the negative pressure hose 14.

A vacuum switch 18 is provided in the vacuum flow path 12, and when it is detected that the vacuum degree in the vacuum cup V reaches a predetermined vacuum degree, the solenoid valve 6 is de-energized. However, the check valve 8 prevents air from leaking and the vacuum degree 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 work W is transported to the predetermined position by the vacuum cup V, the solenoid valve 16 is energized to bring the solenoid valve 16 to the vacuum breaking position, so that the connection port 17c communicates with the vacuum breaking port 17a. The vacuum flow path 12 is closed. Therefore, the compressed air from the working fluid supply port 3 does not affect the pressure in the vacuum flow path 12 and passes through the vacuum break flow path 15 regardless of whether the ejector body 1 is activated or deactivated. As a result, the work W is surely supplied to the vacuum cup V at a predetermined timing, and the work W is released from the vacuum cup V. At this time, the amount of compressed air flowing through the vacuum breaking flow path 15 is adjusted by the flow rate adjusting mechanism 19.

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

The ejector device shown in the figure has two blocks, a first block B1 and a second block B2, and an ejector main body 1 is formed in these blocks, and the first block B1 has a second block B2. A flow rate adjusting mechanism 19 is formed on the third block B3 which is positioned and attached on the opposite side. Further, a fourth block B4 is attached to the third block B3.

The above four blocks B1 to B4 are attached to the manifold M via the adapter A, and these blocks B1 to B4 and these blocks and the adapter A etc. are not shown in the drawings such as bolts and screws. Are mutually concluded by.

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

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 muffled by the muffler 5 attached to the adapter A, and then flows out from the exhaust port 21.

A working fluid supply port 3 connected to an air pressure source (not shown) is formed in the manifold M, and extends from this port 3 to the manifold M, the adapter A, and the second block B2. The path 4 is formed. The working fluid passage 4a formed at a position concentric with the center of the nozzle 20a is communicated with the working fluid passage 4 of the second block B2 through the communicating hole 4b, and the opening end of this working fluid passage 4a is opened. A valve seat 22 is formed in the portion.

A solenoid valve 6 for controlling the supply air is attached to the second block B2 at a portion of a yoke 6a, and a valve body 6c provided at the tip of a plunger 6b of the solenoid valve 6 is provided with a valve seat. It is designed to be pressed against 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. A solenoid 6d is formed around the bobbin 6e by winding a conducting wire around the bobbin 6e, and the periphery thereof is sealed by a housing 6g made of, for example, resin.

Electric power is supplied to the solenoid 6d through a power supply cable 6h which is directly or detachably connected to the housing 6g. The outer end surface 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 to connect the fluid chamber 23 formed on the tip end side of the plunger 6b and the air supply port 2a of the ejector body 1 to each other. Has been done.

An elastic force is applied to the plunger 6b of the solenoid valve 6 by the spring member 27 in the direction in which the valve body 6b is pressed against the valve seat 22, 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.

An electromagnetic valve 16 for controlling vacuum breaking air is attached to the fourth block B4 at a portion of the yoke 16a thereof, and a plunger 16b of this electromagnetic valve 16 faces the plunger 6b of the electromagnetic valve 6. . This solenoid valve 16 has the same structure as the solenoid valve 6, and the same reference numerals a to i are given to the members constituting the solenoid valve 16 which are common to the members constituting the solenoid valve 6. It is attached.

A valve seat 30 on which the valve body 16c is pressed is provided at the opening of the vacuum breaking port 17a formed in the block B4 so as to face the valve body 16c provided at the tip of the plunger 16b of the solenoid valve 16. It is provided. The vacuum breaking port 17a communicates with the working fluid supply port 3 through a vacuum breaking flow path 15 that is branched from the working fluid flow path 4 and formed in the blocks B1 to B4. However, the vacuum break flow path 15 may be directly connected to the working fluid supply port 3 or may be connected to the air pressure source.

In the fourth block B4, a vacuum supply port 17b is formed on the side opposite to the vacuum break port 17a, and it contacts the valve seat 31 formed in the opening of this port 17b. The valve element 32 is arranged in the block B4. A plunger pin 33 is axially slidably mounted in the block B4 in order to interlock the two valve bodies 16c and 32 with each other with a constant space therebetween. Although only one plunger pin 33 is shown in FIG. 2 for convenience of drawing, a plurality of plunger pins 33 are mounted in an actual ejector device.

A spring member 34 for biasing an elastic force in the direction of closing the vacuum supply port 17 b is attached to the valve body 32 between the valve body 32 and the retainer 35. A spring member 36 is attached to the plunger 16b to urge the valve body 16c with a strong elastic force in the direction of closing the vacuum break port 17a. Therefore, when the solenoid 16d is not energized, as shown in FIG. 3, the valve body 16c closes the vacuum break port 17a, while the plunger pin 33 causes the valve body 32 to move from the valve seat 31. The vacuum port 17b will be opened apart. When electric power is supplied to the solenoid 16d, the plunger 16b moves backward, so that the valve body 16c separates from the valve seat 30 to open the vacuum breaking port 17a as shown in FIG. The body 32 is pressed against the valve seat 31 to close the vacuum supply port 17b.

The vacuum supply port 17b is connected to the vacuum flow path 12a formed in the blocks B1, B3, B4, and is connected to the suction port 2c of the ejector body 1 to be formed in the block B1, the adapter A, and the manifold M. The formed vacuum flow path 12b is communicated with the vacuum flow path 12a via a vacuum flow path 12c formed outside the annular seal member 40 arranged between the block B 1 and the adapter A. The vacuum flow path 12 shown in FIG. 1 is formed by the vacuum flow paths 12a to 12c.

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

A connection port 17c, which is connected to either the vacuum break port 17a or the vacuum supply port 17b by the solenoid valve 16, is formed in the fourth block B4, and this port 17c is connected to the vacuum cup V or the like by the negative pressure hose 14. It is designed to be connected to negative pressure equipment. The position of the connection port 17c is not limited to the fourth block B4, and may be provided at any position by extending the flow path into the blocks B4, B3, B1, the adapter A, the manifold M, and the like. it can. As the negative pressure device, various devices other than the vacuum cup V as shown in the drawing can be used. As shown in FIG. 2, a flow rate adjusting mechanism 19 for adjusting the amount of air flowing through the vacuum break flow path 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 flow path 15 is provided at the tip of the screw shaft 45. A knob 47 is provided at the base end of the screw shaft 45, and a lock nut 48 is screwed to the screw shaft 45.

In the fourth block B4, a push pin 51 is provided slidably 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 retracted limit position due to the elastic force of the spring member 52, and a taper portion 53 is formed at the tip end portion thereof, which comes into contact with the tip end surface of the plunger 16b by the forward movement. The second block B2 is provided with a push pin 51a having the same structure as the push pin 51 in order to separate the valve body 6c of the solenoid valve 6 from the valve seat 22.

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 solenoid 6d of the solenoid valve 6 is energized to move the plunger 6b backwards against the elastic force of the spring member 27.

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

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

When the vacuum switch 18 detects that the pressure in the vacuum flow path 12b has reached a predetermined pressure, the solenoid valve 6 is de-energized and the negative pressure is stopped. At this time, the check valve 8 holds the pressure in the negative pressure device.

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, as shown in FIG. 2, the solenoid valve 16 is in the vacuum breaking position and the vacuum breaking port 17a. The communication with the connection 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 flow path 15, so that the negative pressure state is quickly released.

When the negative pressure is released, the valve body 32 is in pressure contact with the valve seat 31 and the communication between the vacuum port 17b and the connection port 17c is released, so that the compressed air from the vacuum break flow path 15 is compressed. Does not enter the ejector body 1 side, and the negative pressure release timing can be set with high accuracy.

It is needless to say that the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the invention.

[0047]

[Effect of device]

 The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.

(1) As described above, according to the present invention, the vacuum supply position for connecting the connection port connected to the negative pressure device to the vacuum supply port, and the vacuum supply position for connecting the connection port to the vacuum break port. Since it has a 3-port switching valve that operates to the break position, when releasing the negative pressure state of the negative pressure equipment, the vacuum break flow path is cut off from the vacuum flow path and the negative pressure equipment Only the vacuum break flow path is in communication.

(2) As a result, when releasing the negative pressure state in the negative pressure equipment, the ejector body is always operated with or without the vacuum until a certain timing. Negative pressure can be released by breaking, and it has become possible to control negative pressure equipment with high accuracy.

[Brief description of drawings]

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

FIG. 2 is a cross-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 in a vacuum supply position.

FIG. 4 is a cross-sectional view showing details of a solenoid valve of which only a part is shown in FIG.

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

[Explanation 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 for Controlling Supply Air (Open / Close Valve) 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 19 Flow rate adjusting 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 Seal 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

Claims (1)

[Scope of utility model registration request] 1. A supply port to which a working fluid is supplied, an exhaust port from which a working fluid that has flowed in from the supply port flows out, and a suction port that is open to the flow from the supply port to the exhaust port. In an ejector device having an ejector main body, an opening / closing valve that opens and closes a working fluid passage connecting the working fluid supply port and the air supply port, a vacuum breaking port of a vacuum breaking passage communicated with the working fluid supplying port, A vacuum supply port of a vacuum channel having a check valve that is connected to the suction port and guides a flow toward the suction port and blocks a flow in the opposite direction, and a connection port that communicates with the outside are provided, and the connection port is Three-port disconnection that operates between a vacuum supply position that communicates with the vacuum supply port and a vacuum break position that communicates the connection port with the vacuum break port Ejector device having a valve.