JPH1122699A - Ejector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a space to be occupied by a device, by integrating the ejector device and a switching valve, and to reduce the manufacturing cost of an ejector device. SOLUTION: When a switching valves 160 is displaced in one direction, an input port 61 and the first output port 62 are communicated with each other, the compressed air is introduced to a nozzle 144 of an ejector 150 from a compressed air supply source connected with a connector 20, and the compressed air is discharged from a diffuser 148 to an exhaust pipe connected with a connection 24. On this occasion, the negative pressure is generated in a negative pressure generation chamber 146, and the negative pressure is output to a vacuum equipment 164 connected with a connector 22. When the switching valve 160 is displaced in the other direction, the input port 61 and the second output port 68 are communicated with each other, the compressed air is introduced into the vacuum equipment 164 through a needle valve 39, and the vacuum break of the vacuum equipment 164 is performed.

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, and more particularly, to an ejector device integrally formed with a switching valve to reduce the occupied space and reduce the manufacturing cost. It relates to a possible ejector device.

[0002]

2. Description of the Related Art Conventionally, ejector devices have been widely used as negative pressure generating sources for vacuum equipment. In this type of ejector device, a switching valve formed separately is connected to the ejector device, and by controlling the switching valve, a pressure fluid is introduced into the ejector device to generate a negative pressure, and the negative pressure is generated. The data is output to the vacuum device.

[0003]

As described above, in the conventional ejector device, since the ejector device and the switching valve are formed separately, it is necessary to connect both with a pipe.
There is a disadvantage that the space occupied by the entire apparatus is increased. In addition, the ejector device and the switching valve require a joint for connecting the pipe, and thus the number of parts of the ejector device is increased, so that the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises an ejector device and a switching valve integrated with each other to reduce the space occupied by the ejector device.
An object of the present invention is to provide an ejector device capable of reducing the manufacturing cost.

[0005]

In order to achieve the above object, the present invention is directed to a negative electrode formed between the nozzle and the diffuser by the pressure fluid introduced into the nozzle being led out of the diffuser. In an ejector device for generating a negative pressure in a pressure generating chamber, a switching valve is provided integrally with the ejector device, and the switching valve has an input port connected to a pressure fluid supply source and an output communicating with the nozzle. A port is provided, and by activating the switching valve, the input port and the output port are connected or disconnected to control the generation of a negative pressure in the negative pressure generating chamber.

According to the present invention, when the pressure fluid supply source is energized and the input port and the output port communicate with each other under the urging action of the switching valve, a pressure is applied from the output port to the nozzle of the ejector unit. Fluid is introduced and the pressure fluid is withdrawn from the diffuser. At this time, a negative pressure is generated in the negative pressure generating chamber, and the negative pressure is output to a vacuum device communicating with the negative pressure generating chamber.

In this case, the output port comprises a first output port and a second output port, wherein the first output port supplies a pressure fluid to the nozzle while the second output port supplies the pressure fluid to the nozzle.
The output port communicates with the negative pressure generation chamber, and when the input port communicates with the second output port under the urging action of the switching valve, a pressure fluid is supplied to the negative pressure generation chamber and This is preferable because the vacuum in the negative pressure generating chamber is broken, and the vacuum state of the vacuum device communicating with the negative pressure generating chamber can be released.

In this case, the switching valve includes a spool valve, a piston fixed to an end of the spool valve,
An electromagnetic valve for introducing a pressurized fluid into a cylinder chamber in which the piston is displaced, wherein the spool valve is displaced under the urging action of the electromagnetic valve to connect or disconnect the input port and the output port. When the spool valve is displaced,
The displacement of the spool valve is not disturbed by the pressure of the pressure fluid of the input port and the output port, and the input port and the output port can be reliably connected or disconnected,
More preferred.

Further, in this case, the switching valve is provided with a valve member which is manually driven and introduces a pressure fluid into the cylinder chamber, and the spool valve is displaced by manually driving the valve member. When the input port and the output port are connected or disconnected, the ejector device can be driven manually, which is more preferable.

Further, in this case, if the vacuum generating chamber is provided with a vacuum switch for detecting that the negative pressure generating chamber has reached a predetermined pressure and generating a signal, the vacuum switch is connected to the vacuum switch. The control device can control the vacuum device or the like when a predetermined pressure is output to the vacuum device based on a signal generated from the vacuum switch,
preferable.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An ejector device according to the present invention will be described in detail below with reference to the accompanying drawings showing preferred embodiments.

In FIG. 1 and FIG.
1 shows an ejector device according to a first embodiment of the present invention. This ejector device 10 includes a manifold block 12
On the lower surface of the manifold block 12, pawl portions 16a, 1
6b is formed. The one claw portion 16a is formed to be elastic and flexible, and the claw portion 16a presses the rail 14 to move the manifold block 12 to the rail 14
(See FIG. 3). A plurality of protrusions 19, 19 are formed on one side surface of the manifold block 12, and the protrusions 19, 19 can be engaged with recesses formed on other manifold blocks 12 and devices such as end blocks (not shown). Although not shown, a plurality of recesses are formed in the other side surface of the manifold block 12, and the recesses are formed in the recesses in the same manner as the protrusions 19 formed in the other device. Are engageable. Therefore, it is possible to configure a desired pneumatic device including the ejector device 10 by assembling a plurality of other devices on the rail 14. Further, although not shown, a configuration is provided in which a compressed air supply passage is provided in the protrusion 19 or the concave portion, and compressed air is supplied from the compressed air supply passage to the ejector device 10 or other devices assembled to the ejector device 10. It is also possible to use

At one end of the manifold block 12, pipe joints 20, 22, 24 are provided.
As shown in FIGS. 3 and 4, passages 30, 3 formed in the manifold block 12 are provided inside the manifolds 22, 24.
2 and 34 communicate with each other, and the respective passages 30, 32 and 34 are bent in the manifold block 12 and open to the upper part of the manifold block 12. A passage 33 communicates with the passage 32, and the passage 33 opens at an upper portion of the manifold block 12. In addition, a passage 35 is defined above the manifold block 12 so as to extend in the transverse direction of the manifold block 12.
A passage 37 shorter than 5 is defined (see FIG. 2).

A needle valve (adjustment member) 39 is provided at one end of the manifold block 12. The needle valve 39 includes a needle bush 36 fixed to the manifold block 12.
A female screw 38 is threaded into the wall forming the hole 6.
The female screw 38 is screwed with a male screw 42 of a needle 40 constituting the needle valve 39, and by rotating a grip portion 44 formed at one end of the needle 40, the needle 40 is moved in the arrow A or B direction. Is displaced. A through hole 36a is defined in the needle bush 36, and a parallel pin 41 is inserted into the through hole 36a. The parallel pin 41 has a groove 4 formed around the needle 40.
3 so that the needle 40 is prevented from coming off from the needle bush 36. The needle 40
A lock nut 45 for positioning the needle 40 is screwed into the male screw 42 of the above. The distal end portion 40a of the needle 40 faces the passages 46 and 48, and when the needle 40 is displaced in the direction of arrow A, the distal end portion 40a closes the hole 49 for communicating the passages 46 and 48, while When the needle 40 is displaced in the direction of arrow B, the respective passages 46 and 48 communicate with each other. The passages 46, 48
Opens at the top of the manifold block 12.

Block caps 50 and 52 are fixed to the other end of the manifold block 12 (FIGS. 2 and 3).
), One block cap 50 has the rail 1
An attachment / detachment switch 54 for controlling attachment / detachment of other devices connected along 4 is provided so as to be displaceable in the directions of arrows A and B (see FIG. 3). A spring-like portion 56 is formed on the detachable switch 54. This is because the detachable switch 54 is urged in the direction of arrow A by the spring-like portion 56. The attachment / detachment switch 54 has rectangular holes 58a and 58b defined therein (see FIG. 2), and a claw formed on another device connected adjacently to the wall portion forming the holes 58a and 58b. , The other device is prevented from falling off.

An ejector body 60 is fixed to an upper portion of the manifold block 12, and the ejector body 60
Includes a switching valve portion 60a (see FIG. 3) and an ejector portion 60b (see FIG. 4). First, the switching valve portion 60a will be described with reference to FIG. 5. An input port 61, a first output port 62, and a second output port 68 are defined below the ejector body 60, Each port 6
1, 62, 68 communicate with the passages 30, 35, 48 of the manifold block 12. The lower part of the ejector body 60 has a passage 6 communicating with the passages 37 and 46.
4, 66 are defined. The respective ports 61, 6
2, 68 communicate with a chamber 70 defined in the ejector body 60 along the longitudinal direction.

A spool valve 74 is slidably provided in the chamber 70. A plurality of pairs of flange portions 76a to 76d are formed on the outer periphery of the spool valve 74, and grooves 78a to 78d are defined in each of the flange portions 76a to 76b so as to go around the spool valve body 74a. In this case, packings 80a, 80c are provided in the grooves 78b, 78c.
b is attached. The chamber 70 communicates with a passage 72 defined in parallel with the chamber 70 via a passage 71 defined above the input port 61.

A spacer 82 is fixed to one end of the ejector body 60, and a passage 83 communicating with the passage 72 is defined in the spacer 82. Further, the spacer 82 communicates with the chamber 70, and its axis is aligned with the chamber 70, and a chamber 84 having a larger diameter than the chamber 70 is defined. The chamber 84 is provided with ring-shaped seating members 86a and 86b through which one end of the spool valve main body 74a is inserted. A spring member 90 is provided between the seat members 86a and 86b, and the spring member 90 constantly urges the seat members 86a and 86b in a direction in which they are separated from each other. The seat members 86a and 86b are connected to the spool valve 7
4 can be engaged with the flange portions 88a and 88b formed on one end side, respectively, and when the spool valve 74 is displaced in the direction of arrow A, as shown in FIG. By displacing 86b in the direction of arrow A, the resilient force of the spring member 90 acts on the spool valve 74 to urge the spool valve 74 in the direction of arrow B.
When the cylinder 4 is displaced in the direction of arrow B, as shown in FIG. 6, the other flange portion 88a displaces the other seat member 86a in the direction of arrow B, so that the elastic force of the spring member 90 acts on the spool valve 74. And is urged in the direction of arrow A.

At one end of the ejector body 60 and at the end of the spacer 82, an adapter plate 94 is provided.
a and 94b are fixed respectively. One adapter plate 94a will be described.
4a, a cylinder chamber 96a communicating with the chamber 70 is defined, and a piston 98a fixed to one end of the spool valve 74 is provided in the cylinder chamber 96a so as to be displaceable in the directions of arrows A and B. The adapter plate 94a defines a passage 100a communicating with the passage 72 defined in the ejector body 60, and the passage 100a extends vertically inside the adapter plate 94a. And 102a. A passage 104a communicating with the cylinder chamber 96a is defined in a wall portion forming the chamber 102a, and a passage 108a and a passage 110a are defined. The passage 108a and the passage 110a are formed on side surfaces of the adapter plate 94a. It communicates with the inside of the fixed solenoid valve 106a. The solenoid valve 106a is configured to connect or shut off the passages 108a and 110a under the urging action thereof.

A cylindrical valve member 112a is provided in the chamber 102a so as to extend in the vertical direction in FIG. 5, and a flange portion 114a is formed below the valve member 112a. A spring member 116a is provided between 114a and the bottom of the chamber 102a. Therefore,
The valve member 112a is constantly urged upward by the spring member 116a. The valve member 112a is provided with an O-ring 118a above the flange portion 114a, and the O-ring 118a slidably contacts the inner wall of the chamber 102a. In addition, a flange portion 119a and a flange portion 120a are formed at a predetermined distance from the flange portion 119a at an upper portion of the valve member 112a, and an O-ring 122a is provided between each flange portion 119a and the flange portion 120a. Provided. A flange 123a is formed at an upper end of the valve member 112a. The chamber 102a
A stopper 126a is provided to protrude from the inner wall, and the stopper 126a can freely contact the flange portion 120a and the flange portion 123a. Therefore, the valve member 1
The vertical displacement range 12a is restricted by the stopper 126a.

Since the other adapter plate 94b has the same configuration as the one adapter plate 94a,
The same reference numerals are denoted by reference characters b instead of reference characters a, and detailed descriptions thereof are omitted.

Next, the ejector portion 60b will be described. As shown in FIG. 4, an adapter plate 130 is fixed to one end of the ejector body 60, and a chamber 132 is defined in the adapter plate 130. . Room 1
32 is a passage 1 defined in the adapter plate 130.
33 and a passage 134 defined in the ejector body 60 to communicate with a passage 32 defined in the manifold block 12. The adapter plate 130
A vacuum switch 136 that detects a pressure in the chamber 132 and generates a detection signal when the pressure in the chamber 132 reaches a predetermined pressure is fixed via a holding plate 135, and an end of a sensor portion 138 of the vacuum switch 136. The part faces the inside of the chamber 132. The vacuum switch 136 is connected to the holding plate 1
The cover member 139 is fixed to the cover 35.

A chamber 140 is defined at one end of the ejector body 60, and the chamber 140 communicates with a passage 35 defined in the manifold block 12. Chamber 14
0 is provided with a nozzle 144 on the wall portion thereof.
One end of the nozzle 1 projects into the chamber 140 and the nozzle 1
The other end of 44 projects into a negative pressure generating chamber 146 defined inside the ejector body 60. The negative pressure generating chamber 14
6 is a passage 3 defined in the manifold block 12
3 and the passage 66 shown in FIG. A diffuser 148 is fixed coaxially to the nozzle 144 on a wall that forms the negative pressure generating chamber 146 and faces the nozzle 144. An ejector 150 is configured by the nozzle 144 and the diffuser 148. A cover member 152 is fixed to the other end of the ejector body 60, and the ejector body 60 and the cover member 1 are fixed to each other.
A chamber 154 from which the end of the diffuser 148 protrudes is formed between the diffuser 148 and the diffuser 148. The chamber 154 communicates with a passage 34 defined in the manifold block 12.

FIG. 7 shows a circuit diagram of the ejector device 10 according to the first embodiment. As will be understood from this circuit diagram, the fitting 20 is connected to the input port 61 of the switching valve 160, and when the switching valve 160 is energized, the input port 61 becomes the first output port 62 or the second output port 62. Is configured to communicate with the output port 68. The first output port 62 is connected to the nozzle 144 of the ejector 150 (see FIG. 4), and the diffuser 148 of the ejector 150 is connected to the fitting 24. The negative pressure generating chamber 146 of the ejector 150 is connected to the pipe joint 22 and to the needle valve 39, and the needle valve 39 is connected to the switching valve 160.
In communication with the second output port 68.

The ejector device 10 according to the first embodiment of the present invention is basically configured as described above, and the operation will be described next.

The pipe joint 20 is connected to a compressed air supply source 162, and the pipe joint 22 is connected to a vacuum device 164 that requires a negative pressure, such as a suction pad. Also,
An exhaust pipe 166 is connected to the pipe joint 24. Exhaust pipe 16
Although not shown, a silencer can be attached to 6.

When the compressed air supply source 162 is energized and compressed air is supplied to the pipe joint 20, the compressed air is supplied from the pipe joint 20 through the passage 30 to the input port 61 as shown in FIG.
Will be introduced. However, since the spool valve 74 is not displaced, the input port 61 does not communicate with the first output port 62 or the second output port 68, and no compressed air is introduced into the respective output ports 62, 68. Compressed air flows from the chamber 70 to the passages 71, 72, 83, 100a, 100b.
Through the chambers 102a of the adapter plates 94a, 94b,
102b. At this time, the pressure of the compressed air introduced into the chamber 70 from the input port 61 is evenly applied to the flange portions 76b and 76c of the spool valve 74. Therefore, the pressure of the compressed air causes the spool valve 74 to move in the directions of arrows A and B. No displacement force is generated. For this reason, as described later, when the spool valve 74 is displaced, the displacement is not hindered by the pressure of the compressed air.

When one of the solenoid valves 106a is energized, the passages 108a and 110a communicate with each other inside the solenoid valve 106a. Therefore, as shown in FIG. 6, compressed air is introduced into the cylinder chamber 96a through the passage 104a, the piston 98a is displaced inside the cylinder chamber 96a, the spool valve 74 is displaced in the direction of arrow B, and the input port 61 and the first output port 62 communicate with each other. Therefore, compressed air flows from the input port 61 to the first output port 62, the passage 35, and the chamber 1
40 and introduced into the nozzle 144 (FIGS. 3 and 4).
reference). The compressed air passing through the nozzle 144 is diffused by the diffuser 1
The gas is introduced into the chamber 154 through the passage 48, and is discharged from the fitting 24 to the exhaust pipe 166 through the passage 34. At this time, a negative pressure is generated in the negative pressure generation chamber 146, and the negative pressure is generated in the passage 33,
It is output to the pipe joint 22 via 32 and is output to the vacuum equipment 164 connected to the pipe joint 22. That is, air is sucked into the ejector device 10 from the vacuum device 164.

The negative pressure generated in the negative pressure generating chamber 146 is introduced from the passages 33 and 32 into the chamber 132 through the passages 134 and 133, and the pressure in the chamber 132 is reduced. When this pressure reaches a predetermined pressure value, the vacuum switch 136 detects this pressure and outputs a detection signal to a controller (not shown). Therefore, when the detection signal is input, the control device can control the vacuum device 164 such as sucking a work by the vacuum device 164 (for example, a suction pad).

When the other solenoid valve 106b is energized, the passages 108b and 110b communicate with each other inside the solenoid valve 106b. For this reason, as shown in FIG. 5, the compressed air introduced into the chamber 102b is introduced into the cylinder chamber 96b, the piston 98b is displaced in the cylinder chamber 96b, and the spool valve 74 is displaced in the direction of arrow A to input. The port 61 communicates with the second output port 68. Therefore, the compressed air flows from the input port 61 through the second output port 68 and the passage 48, and is introduced into the passage 46 with the flow rate adjusted by the needle valve 39 (see FIGS. 3 and 4). And passage 6
6, the pipe joint 2 through the negative pressure generating chamber 146 and the passages 33 and 32
In step 2, compressed air is introduced into the vacuum device 164, and the vacuum device 164 is broken. At this time, if compressed air is suddenly introduced into the vacuum device 164, an impact is generated, and the vacuum device 16
4 may be damaged by this impact. However, in the present invention, since the flow rate of the compressed air is restricted by the needle valve 39 and gradually introduced into the vacuum device 164, the compressed air is not rapidly introduced into the vacuum device 164, and There is no fear that the device 164 will be damaged.

The ejector device 10 includes a valve member 112
By manually displacing a and 112b, the spool valve 74 can be displaced, and a negative pressure can be output to the vacuum device 164. For example, when the operator displaces the valve member 112a downward in FIG. 6 against the elastic force of the spring member 116a, the O-ring 118a is displaced below the passage 104a, and the O-ring 118a is displaced downward from the passage 104a. Communicate.
Therefore, as described above, the compressed air introduced into the input port 61 is introduced into the cylinder chamber 96a through the passages 71, 72, 100a, the chamber 102a, and the passage 104a, and the piston 98a is displaced in the direction of arrow B. I do. The input port 61 and the first output port 62 communicate with each other, and compressed air is introduced into the nozzle 144 of the ejector 150 in the same manner as described above. The negative pressure is output to the vacuum device 164 (see FIG. 4).

On the other hand, when the valve member 112b is displaced downward in FIG. 5, the passage 100b communicates with the passage 104b, compressed air is introduced into the cylinder chamber 96b, and the piston 98b is displaced in the direction of arrow A. . Therefore, compressed air is introduced from the input port 61 to the second output port 68,
As described above, the flow rate is controlled by the needle valve 39, introduced into the vacuum device 164, and broken in vacuum.

As described above, if the ejector device 10 can be driven manually, for example,
For example, when a test of the vacuum equipment 164 in which is used is required, the test can be easily performed manually.

In the first embodiment, the ejector device 10
Is attached to the rail 14, but may be used without being attached to the rail 14.

Next, an ejector device 200 according to a second embodiment will be described with reference to FIG. Note that the same components as those of the ejector device 10 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the ejector body 202 fixed to the manifold block 12 of the ejector device 200, a passage 204 is defined above the chamber 70 through which the spool valve 74 is inserted, and the passage 204 is defined in parallel with the chamber 70. It communicates with the formed passage 206. The passage 206 opens at one end of the ejector body 202. The ejector body 202 has a passage 208 parallel to the passage 206.
And the passage 208 is provided with the ejector body 202.
Open at both ends.

At one end of the ejector body 202, an attachment 210 is fixed, and the attachment 210 communicates with the chamber 70 as shown in FIG.
A cylinder chamber 212a in which the piston 98a slides is defined. A passage 214 communicates with the cylinder chamber 212a. The attachment 210 defines passages 216 and 218 communicating with the passage 206 and a passage 220 communicating with the passage 208, and the passages 218 and 220 define a chamber 222.
Communicate with A substantially cylindrical valve member 224 is slidably inserted into the chamber 222, and the valve member 224 includes a spring member 226.
Is always urged upward. A circumferential groove 228 is defined in the valve member 224, and a pin member 230 fixed to the attachment 210 enters the groove 228. The pin member 230 is engaged with the groove 228 to restrict the displacement range of the valve member 224.

An adapter plate 232 is fixed to the attachment 210, and the chambers 234a and 234 are provided between the adapter plate 232 and the attachment 210.
4b is defined. The chambers 234a and 234b are provided with valve bodies 236a and 236b that function as check valves. The adapter plate 232 has one chamber 234a.
Are defined, and the passages 242, 244, 245 communicating with the other chamber 234b are defined, and the passage 245 is defined as the passage 2 defined in the attachment 210.
It communicates with the chamber 222 through 47. The passage 238
The valve member 248 is slidably inserted into the chamber 246, and the valve member 248 is constantly urged upward by a spring member 250. A circumferential groove 252 is defined in the valve member 248, and a pin member 254 fixed to the adapter plate 232 enters the groove 252.

The adapter plate 232 has vertically extending passages 256 and 258. One of the passages 256 is open to the outside of the adapter plate 232 and communicates with the chambers 234a and 234b. Further, the other passage 258 communicates with the passage 216. Passage 2
58 is closed by the plug member 260.

As shown in FIG. 8, a casing 262 is fixed to the adapter plate 232, and electromagnetic valves 264a and 264b are provided inside the casing 262. The solenoid valves 264a and 264b are provided with bobbins 266a,
266b, and coils 268a and 268b are wound around the bobbins 266a and 266b. The bobbin 266
a and 266b are provided with slidable displacement members 269a and 269b, and when the coils 268a and 268b are urged, the displacement members 269a and 269b turn to the arrow A.
Or it is displaced in the B direction. When one displacement member 269a is displaced in the direction of arrow A, the passage 258 and the chamber 246 communicate with each other, as shown in FIG.
When 9b is displaced in the direction of arrow A, the passage 258 communicates with the passages 242 and 244, as shown in FIG.

A spacer 270 is fixed to the other end of the ejector body 202, and a passage 272 communicating with the passage 208 is defined in the spacer 270.
An end plate 274 is fixed to the spacer 270, and a passage 276 communicating with the passage 272 is defined in the end plate 274.
8b communicates with the sliding cylinder chamber 278.

The ejector device 200 according to the second embodiment of the present invention is basically configured as described above, and its operation will be described next.

As in the ejector device 10 according to the first embodiment, a compressed air supply source 162 is connected to the pipe joint 20 and a negative pressure is required for the pipe joint 22, for example,
A vacuum device 164 such as a suction pad is connected. An exhaust pipe 166 is connected to the pipe joint 24.

When the compressed air supply source 162 is energized and compressed air is supplied to the pipe joint 20, the compressed air is supplied from the pipe joint 20 through the passage 30 to the input port 61 as shown in FIG.
Will be introduced. However, since the spool valve 74 is not displaced, the input port 61 does not communicate with the first output port 62 or the second output port 68, and no compressed air is introduced into the respective output ports 62, 68. At this time,
Compressed air is introduced into passages 204, 206, 216, 258 and from passage 218 into chamber 222.

When one of the solenoid valves 264a is energized and the displacement member 269a is displaced in the direction of arrow A, as shown in FIG. 10, the passage 258 communicates with the chamber 246, and the compressed air flows from the chamber 246 to the chamber 234a. Cylinder chamber 2 via passage 214
The piston 98a is introduced into the cylinder chamber 212
The inside of a is displaced, the spool valve 74 is displaced in the direction of arrow B, and the input port 61 and the first output port 62 communicate. Therefore, compressed air is introduced from the input port 61 to the nozzle 144 via the first output port 62, the passage 35, and the chamber 140 (see FIG. 4). The compressed air passing through the nozzle 144 passes through the diffuser 148 and is introduced into the chamber 154,
The gas is discharged from the pipe joint 24 to the exhaust pipe 166 through the passage 34. At this time, a negative pressure is generated in the negative pressure generating chamber 146, and the negative pressure is output to the pipe joint 22 through the passages 33 and 32, and is output to the vacuum device 164 connected to the pipe joint 22. . That is, air is sucked into the ejector device 10 from the vacuum device 164.

When the other solenoid valve 264b is urged and the displacement member 269b is displaced in the direction of arrow A, the passage 258 and the passages 242, 244 communicate as shown in FIG. Therefore, the compressed air flows from the passage 258 to the chamber 234b and the passage 2
45, 247, chamber 222, passages 220, 208, 27
The piston 98b is displaced in the cylinder chamber 278 through 2, 276, and the piston 98b is displaced in the cylinder chamber 278, the spool valve 74 is displaced in the direction of arrow A, and the input port 61 and the second output port 68 communicate. Therefore, compressed air passes from the input port 61 to the second output port 68 and the passage 48,
The flow rate is adjusted by the needle valve 39 and introduced into the passage 46 (see FIG. 4). The passage 66 and the negative pressure generating chamber 1
46, the pipes 33 and 32 are connected to the pipe joint 22, and compressed air is introduced into the vacuum device 164 to break the vacuum.

The ejector device 200 includes a valve member 224,
It is also possible to displace the spool valve 74 by manually displacing the 248 and output a negative pressure to the vacuum device 164. For example, an operator may attach the valve member 248 to the spring member 2.
10, when displaced downward in FIG. 10 against the resilient force of 50, the displacement member 269a is displaced in the direction of arrow A by being pressed by the slope portion 248a of the valve member 248, and the passage 258 and the chamber 24 are displaced.
6 communicates. Therefore, as described above, the compressed air introduced into the input port 61 is supplied to the chamber 234a and the passage 214.
The piston 98a is displaced in the direction of arrow B by being introduced into the cylinder chamber 212a. The input port 61 and the first output port 62 communicate with each other, and compressed air is introduced into the nozzle 144 of the ejector 150 in the same manner as described above. The negative pressure is output to the vacuum device 164 (see FIG. 4).

On the other hand, when the valve member 224 is displaced downward in FIG. 9, the passage 218 communicates with the passage 220, and compressed air is introduced into the cylinder chamber 278 through the passages 208, 272, 276. The piston 98b is displaced in the direction of arrow A. For this reason, compressed air is introduced from the input port 61 to the second output port 68, the flow rate is controlled by the needle valve 39, and introduced into a vacuum device, as described above, to break the vacuum (see FIG. 4).

As described above, if the ejector device 200 can be driven manually, for example, the ejector device 2
For example, when a test of the vacuum device 164 in which 00 is used is required, the test can be easily performed manually.

[0050]

According to the ejector device of the present invention, the following effects and advantages can be obtained.

Since the switching valve is formed integrally with the ejector device, a piping system for connecting the ejector device and the switching valve is not required, the structure is simplified, and the space occupied by the entire device is reduced. At the same time, it is possible to reduce the manufacturing cost.

Further, by connecting the second output port to the negative pressure generating chamber, it is possible to break the vacuum in the negative pressure generating chamber. Further, the switching valve is provided with a spool valve, and the spool valve is displaced. Communication between input port and output port,
In order to control the shutoff, the displacement of the spool valve is not disturbed by the pressure of the pressure fluid introduced into the input port and the output port, and the input port and the output port can be reliably communicated or shut off. A highly reliable ejector device can be obtained.

Further, by providing a manually driven valve member in the switching valve, a negative pressure can be manually output to the vacuum equipment, and the testing of the vacuum equipment becomes easy.

Further, a vacuum switch is provided in the negative pressure generating chamber, and a control device connected to the vacuum switch can control vacuum equipment and the like by the pressure of the negative pressure generating chamber.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of the ejector device of FIG.

FIG. 3 is a sectional view taken along line III-III of the ejector device of FIG. 1;

FIG. 4 is a sectional view of the ejector device of FIG. 1 taken along line IV-IV.

5 is a partially enlarged sectional view showing a state in which a spool valve of the ejector device of FIG. 4 is displaced in a direction of an arrow A.

6 is a partially enlarged sectional view showing a state in which a spool valve of the ejector device of FIG. 4 is displaced in a direction of arrow B.

FIG. 7 is a circuit diagram of the ejector device of FIG. 1;

FIG. 8 is a longitudinal sectional view showing an ejector device according to a second embodiment of the present invention.

9 is a partially enlarged cross-sectional view showing a state where the spool valve of the ejector device of FIG. 8 is displaced in the direction of arrow A.

FIG. 10 is a partially enlarged sectional view showing a state in which a spool valve of the ejector device of FIG. 8 is displaced in a direction of arrow B.

[Explanation of symbols]

10, 200: Ejector device 12: Manifold block 39: Needle valve 60, 202: Ejector body 60a: Switching valve unit 60b: Ejector unit 61: Input port 62, 68 ... Output port 74: Spool valve 136: Vacuum switch 144 ... Nozzle 146: negative pressure generating chamber 148: diffuser 150: ejector 160: switching valve

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16K 31/06 310 F16K 31/06 310D

Claims (5)

[Claims] An ejector device for generating a negative pressure in a negative pressure generating chamber formed between said nozzle and said diffuser by deriving a pressure fluid introduced into said nozzle from said diffuser, wherein said ejector device Is integrally provided with a switching valve, the switching valve includes an input port to which a pressure fluid supply source is connected, and an output port communicating with the nozzle, and the input valve is operated by biasing the switching valve. An ejector device, wherein a negative pressure in the negative pressure generating chamber is controlled by connecting or disconnecting a port and the output port. 2. The ejector device according to claim 1, wherein said output port comprises a first output port and a second output port, wherein said first output port supplies a pressure fluid to said nozzle. The second output port communicates with the negative pressure generating chamber, and when the input port communicates with the second output port under the urging action of the switching valve, a pressure fluid flows into the negative pressure generating chamber. The ejector device, wherein the vacuum is supplied to the negative pressure generating chamber to break the vacuum. 3. The ejector device according to claim 1, wherein the switching valve introduces a pressure fluid into a spool valve, a piston fixed to an end of the spool valve, and a cylinder chamber in which the piston is displaced. An ejector device, comprising: an electromagnetic valve, wherein the spool valve is displaced under the urging action of the electromagnetic valve, and the input port and the output port are communicated or disconnected. 4. The ejector device according to claim 3, wherein the switching valve is provided with a valve member which is manually driven and introduces a pressure fluid into the cylinder chamber, and the valve member is manually driven. The ejector device according to claim 1, wherein the spool valve is displaced so that the input port and the output port are connected or disconnected. 5. The ejector device according to claim 1, wherein a signal is generated in the negative pressure generating chamber by detecting that the negative pressure generating chamber has reached a predetermined pressure. An ejector device provided with a vacuum switch that performs the operation.