JPH08326700A - Ejector unit - Google Patents

Abstract

PURPOSE: To facilitate change work by respectively connecting appropriate nozzle, a diffuser, and a tube to pipe joints installed on each opening part of the T-shaped flow passage of an unit main body, operating the unit, and providing specified suction performance. CONSTITUTION: A device is provided with a synthetic resin T-shaped unit main body 1 having a nearly T-shaped flow passage 2, and pipe joints 3a, 3b, 3c which are respectively installed on each opening part of the flow passage 2. It is provided with a nozzle 4 and a diffuser 5 which are detachably installed on the pipe joints 3a, 3b back faced to each other, and a tube 6 which is detachably installed on the pipe joint 3c in the direction crossed therewith. A work is sucked by vacuum pressure which is generated in the tube 6 by pressure fluid flowing from the nozzle 4 toward the diffuser 5. It is thus possible to provide an ejector unit having a suction flow rate, vacuum pressure and the like according to a property of the work so as to simplify change work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector unit for sucking a work.

[0002]

2. Description of the Related Art A generally T-shaped flow passage, a nozzle portion for supplying compressed air to the flow passage, a diffuser portion provided in the flow passage on an extension thereof, and a tube connecting portion in a direction intersecting with these passages. An ejector that is integrally formed as a unit and that applies a vacuum pressure to a tube connecting portion by compressed air flowing from a nozzle portion to a diffuser portion to suck a desired work is already known without specific examples. . The work sucked by the above-mentioned known ejector requires a large suction flow rate because of its uneven surface, air permeates like paper, and the surface is slippery like a metal plate. Although the suction flow rate may be small, there are some that require a relatively large vacuum pressure, and some that require a high suction pressure, such as lint and dust, that require little vacuum pressure. Those having various suction flow rates and vacuum pressures are required depending on the workpiece to be sucked.

Therefore, conventionally, the ejector has been experimentally operated to determine the nozzle diameter, vacuum pressure, etc. required for the workpiece to be sucked. If the desired performance cannot be obtained by this, the ejector is formed as a unit. Replaced the ejector. However, replacing the entire ejector
Since it is necessary to prepare a large number of types of ejectors having different flow passage dimensions of the nozzle portion and the diffuser portion, the number of types of ejectors becomes large and expensive, and the replacement work is troublesome.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an ejector unit which is inexpensive and easy to replace.

[0005]

In order to solve the above-mentioned problems, an ejector unit according to the present invention comprises a unit body having a substantially T-shaped flow passage, and pipe joints attached to respective openings of the flow passage. A nozzle and a diffuser detachably attached to a pair of pipe joints facing each other, and a tube detachably attached to the pipe joint in a direction intersecting with the pair, and a tube is detachably attached to the pipe by a pressure fluid flowing from the nozzle to the diffuser. The feature is that the work is sucked by vacuum pressure.

Appropriate nozzles, diffusers and tubes are connected to the pipe joints attached to the respective openings of the T-shaped flow passage of the unit body to operate the unit, thereby obtaining the desired suction performance required for the work. If not, by exchanging one or more of these, it is possible to obtain an ejector unit having suction performance according to the work. In this case, replacement of these parts
Only a necessary one can be replaced by the pipe joint provided in the opening of the flow path, and it is not necessary to replace the entire ejector unit. Therefore, one type of unit main body has an ejector unit having suction performance according to the work. Can be obtained. Therefore, the number of required parts is reduced, the cost of the entire unit can be reduced, and the pipe joint facilitates replacement work.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention. This ejector unit comprises a T-shaped unit main body 1 made of synthetic resin having a substantially T-shaped flow passage 2 and the flow passage 2 described above. Pipe fittings 3a, 3b, 3 attached to the respective openings
c, a nozzle 4 and a diffuser 5 which are detachably attached to the pipe joints 3a and 3b facing each other, and a tube 6 which is detachably attached to the pipe joint 3c in a direction intersecting with them. The pipe joints 3a, 3b, 3c of
When the nozzle portion 4 or the like is inserted through the release bush 8, the seal member 9 hermetically seals the outer peripheral surface thereof, and the metal chucks 10, ... It is configured as a so-called one-touch fitting that can be pulled out by releasing the lock by. The nozzle 4
Is a flow path 12 for compressed air formed in the axial direction, and the flow path 1
2 has an inlet pipe joint 13 connected to a compressed air tube (not shown) attached to the base end opening 2 and a variable throttle 14 in the flow path 12, and the tip is detachably attached to the pipe joint 1a. To be done. Further, the diffuser 5 has a parallel portion 16 having a diameter larger than that of the flow path 12 and an outlet pipe joint 17 at the tip of the parallel portion 16, and the base end portion is detachably inserted into the pipe joint 1b. The tube 6 communicating with the suction pad 19 is removably inserted in the pipe joint 3c. The pipe joints 13 and 17 are also configured as so-called one-touch pipe joints.

The nozzle 4 and the diffuser 5 may be formed of a tube of synthetic resin such as urethane resin or polyamide resin. Further, a plurality of unit main bodies 1 may be arranged side by side to form a multiple-type ejector unit. Further, if necessary, the pipe joints 13 and 17
A silencer, a valve, a check valve, a speed controller, a sensor such as a pressure gauge, and a filter (all not shown) can be attached to the.

In the first embodiment, when compressed air is supplied from the tube inserted into the inlet pipe joint 13 of the nozzle 4, the air flowing through the flow passage 12 to the parallel portion 16 of the diffuser 5 causes the flow passage of the unit body 1 to flow. Negative pressure is generated in 2, so that the suction pad 18 connected to the tube 6 sucks the work 19. In this case, the flow rate of the compressed air flowing through the nozzle 4 can be adjusted by the variable throttle 14.
The opening amount of the variable diaphragm 14 can be fixed to the nut 15. In the first embodiment, the required suction flow rate, vacuum pressure, etc. differ depending on the nature of the workpiece 19 to be sucked, but the nature of the workpiece 19 can be obtained by making the nozzle 4, diffuser 5, and tube 6 appropriate. It is possible to obtain an ejector having a desired performance according to the above. When the work 19 is dust or the like, it goes without saying that the suction pad 18 need not be provided. The nozzle 4, the diffuser 5 and the tube 6 can be replaced by the pipe joints 3a, 3b, Easy with 3c. Further, a plurality of types of nozzles 4, diffusers 5 and tubes 6 having the same insertion diameter into each pipe joint and different inner diameters of the flow path 12, the parallel portion 16 and the tube 6 are provided.
Since the unit main body 1 can be made common, the number of necessary parts is reduced and the ejector unit can be made inexpensive as a whole.

FIG. 2 shows a second embodiment of the present invention. In a nozzle 21 of the second embodiment, a solenoid valve 23 is mounted in a flow passage 22. The solenoid valve 23 is composed of a well-known 3-port solenoid valve that switches the outlet port between the inlet port and the discharge port (both ports are not shown) to communicate by exciting and releasing the solenoid. The outlet port communicates with the upstream side and the downstream side of the flow path 22, respectively, and the discharge port opens to the outside. Since the other structure and operation of the second embodiment are the same as those of the first embodiment, the same reference numerals are given to the main parts of the drawing, and the detailed description will be omitted.

[0011]

According to the ejector unit of the present invention, a pipe joint is provided at each opening of the substantially T-shaped passage of the unit body, and a nozzle, a diffuser and a tube are detachably attached to these pipe joints. By attaching the desired nozzle, diffuser, and tube to the unit body, it is possible to obtain an ejector unit having a suction flow rate, vacuum pressure, etc. that suits the properties of the work piece, making it easy to replace them and the entire unit Can be cheap.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a sectional view of a second embodiment.

[Explanation of symbols]

 1 unit main body 2 flow paths 3a, 3b, 3c pipe joint 4 nozzle 5 diffuser 6 tube

Claims (1)

[Claims] 1. A unit body having a substantially T-shaped flow passage, and pipe fittings attached to respective openings of the flow passage,
A nozzle and a diffuser detachably attached to a pair of pipe joints facing each other, and a tube detachably attached to the pipe joint in a direction intersecting with the pair, and a tube is detachably attached to the pipe by a pressure fluid flowing from the nozzle to the diffuser. An ejector unit that sucks a workpiece with vacuum pressure.