JPH04121500A - Vacuum generating unit - Google Patents

Abstract

PURPOSE:To arrest the inflow of an inlet air to a valve system part from an ejector to keep the performance of the valve system part and improve durability by providing a check valve in a passage allowing the compressed air introducing port of the ejector to communicate with the valve system part. CONSTITUTION:A vacuum generating unit 10 is formed of a solenoid valve part 12, a valve system part 14, a manifold 16, an ejector 18, a filter part 20, a detection part 22, and a vacuum port part 24. The valve system part 14 is in contact with one side surface of the manifold 16 consisting of a rectangular body, and the ejector 18 is in contact with the other side surface. In the inside of the manifold 16, an air supply passage 46 and a pilot valve exhaust passage 52 are formed in the direction orthogonal to a paper surface, and a passage 54 allowing an air supply valve 36 to communicate with the ejector 18 and a passage 56 allowing a vacuum break valve 38 to communicate with the vacuum port are formed along the extending direction of the paper surface. In this case, a check valve 57 is inserted between the manifold 16 and the ejector 18 to the passage 54.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a vacuum generation unit that supplies negative pressure to working equipment such as a suction pad.

[Prior Art] Vacuum generation units have conventionally been used as power sources for suction pads and vacuum packs.

This type of vacuum generation unit includes: - an ejector that generates negative pressure for boat fishing; a vacuum port that communicates with work equipment such as a suction pad; and a supply of compressed air to the ejector and the vacuum port; Alternatively, it includes a valve mechanism section that shuts off the air, and a filter section that removes dirt from the air taken in from the working equipment.

The operation of the vacuum generating unit configured as above will be explained.

When sucking air from work equipment, compressed air is first fed to the ejector via the valve mechanism to generate negative pressure. Air sucked from the work equipment is drawn into the vacuum generation unit through the vacuum port, dirt, oil, and other contaminants are removed from the intake air by a filter section, and the air is discharged through the passage inside the vacuum generation unit. Ru.

When releasing the working equipment from the negative pressure state, compressed air is supplied to the working equipment via the valve mechanism and a passage that directly communicates from the valve mechanism to the vacuum port to release the negative pressure state of the working equipment.

[Problem to be solved by the invention:- However, in the above-mentioned conventional technology, when the negative pressure state of the working equipment is released, compressed air is supplied to the working equipment from the vacuum port, and the filter section,
It flows into the valve mechanism section via the ejector. Therefore, the air that is sucked in from the work equipment under negative pressure and remains in the vicinity of the filter section and ejector flows into the valve mechanism section by compressed air, and dust, oil, etc. from the intake air enters the valve of the valve mechanism section. There is a problem of fouling and reducing the performance and durability of the valve.

The present invention solves this kind of problem, and when releasing the negative pressure state of working equipment, prevents intake air from flowing into the valve mechanism, maintains the performance of the valve mechanism, An object of the present invention is to provide a vacuum generation unit that can increase durability.

Means for Solving Two Problems] In order to solve the above problems, the present invention provides a vacuum generation unit, which includes at least an ejector and a valve that supplies compressed air to or shuts off compressed air to the ejector. A mechanism part, and a check valve for preventing air from flowing into the valve mechanism part is provided in a passage communicating with a compressed air introduction port of the ejector.

1. Function 2. In the vacuum generation unit according to the present invention, a check valve is provided in the passage communicating between the compressed air introduction port of the ejector and the valve mechanism to prevent intake air from flowing into the valve mechanism from the ejector. Therefore, the performance of the valve mechanism can be maintained and the durability can be improved.

``Example'' Examples of the vacuum generating unit according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1o indicates a vacuum generation unit according to this embodiment.

The vacuum generation unit 10 basically includes a solenoid valve section 12, a valve mechanism section 14, a manifold 16, an ejector 18, and a filter! 20. It is composed of a detection section 22 and a vacuum port section 24.

The valve mechanism section 14, which is a rectangular body, has the electromagnetic valve section 12 attached to the upper part thereof with a screw, and is disposed so that one side surface of the manifold 16 comes into contact with one side surface of the valve mechanism section 14. On the other side of the valve mechanism section 14, an air supply port 26, a pilot valve supply port 28, a vacuum break port 30, and a pilot valve exhaust port 32 are formed from the bottom. A screw hole is formed near the pilot valve supply port 28 and the vacuum break port 30, and a valve body 34, which essentially constitutes a flow control valve, is screwed into the screw hole. Inside the valve mechanism section 14, a two-point, two-position type air supply valve 36 and a vacuum breaker valve 38 whose axial direction extends in a direction perpendicular to the drawing are disposed, and the valves 36, 38, Ports 26 to 3
2. A passage connecting the solenoid valves 40 to 44 and the manifold 16 is defined.

The electromagnetic valve section 12 installed at the upper part of the valve mechanism section 14 includes a 5-point, 2-position valve that turns on/off an air supply valve 36 and a vacuum breaker valve 38 that constitute the valve mechanism B14B. It has a first solenoid valve 40, a second solenoid valve 42, and a third solenoid valve 44.

The manifold 16, which is a rectangular body, has one side in contact with the valve mechanism section 14, and the other side in contact with the ejector 18. Inside the manifold 16, an air supply passage 46, a pilot valve supply passage 48, a vacuum breaker passage 50, and a pilot valve exhaust passage 52 are formed from the bottom in a direction perpendicular to the drawing, and on the other hand, in the extending direction on the plane of the drawing. Along these lines, there is a passage 54 that communicates between the air supply valve 3G and the ejector 18, and a passage 56 that communicates between the vacuum break valve 38 and the vacuum port. The manifold 16 and the ejector 18 are connected to the passage 54.
A check valve 57 is inserted between them.

As shown in FIGS. 3a and 3b, the check valve 57 has a recess formed on the side of the manifold 16, and a bulging end 57a of the check valve 57 is sandwiched between the ejector 18 and the recess. It is set up in The other end of the check valve 57 is configured to sit in another recess provided on the manifold 16 side.

A side surface of the manifold 16 is arranged such that one side surface of the ejector 18 comes into contact with it. The ejector 18 is a rectangular body, and has a nozzle portion 58 having a predetermined diameter and a differential user portion 60 connected to the nozzle portion 58. The differential user portion 60 has a vacuum generating portion 6.
It is connected to 1.

An opening 62 communicating with the pilot valve exhaust passage 52 of the manifold 16 is formed in the external wall surface of the ejector 18, while the diff user section 60 has a cylindrical shape with the -blade side open, and this opening has a plurality of holes. It is closed by a lid member 64 having slits 63 formed at equal intervals, and a filter 66 is installed between the opening 62 and the lid member 64.

A detection section 22 and a vacuum port section 24 are attached to the other side surface of the ejector 18 (5).

The detection section 22 has a box-like shape, and a vacuum switch 68 is provided inside the detection section 22 . This vacuum spin-chiro 8 is
Preferably, the vacuum generating section 6 is composed of a semiconductor pressure sensor.
The negative pressure generated at 1 is detected via a passage 72 communicating with a vacuum port 70, which will be described later, and a signal for controlling the work equipment is generated. A filter 74 is attached to the interface between the detection section 22 and the vacuum port section 24.

The vacuum port section 24 has a rectangular shape, and a check valve 76 formed of a flexible member is inserted from one side surface on the ejector 18 side.
It has a passage 78 that communicates with the filter section 20 and a vacuum port 70 provided on the other side, forming a passage 72 that extends from the vacuum port 70 to the detection section 22 .

The filter section 20 is adjacent to the detection section 22 and is fixed to the detection section 22 and the vacuum port section 24 . A filter main body 80 is disposed inside the filter section 20, and the filter section 20 is fixed to the vacuum port section 24 with a knob 84 having a stud 82 with a threaded groove formed at its tip. Therefore, by screwing the knob 84, the filter main body 80 can be replaced.

Next, the operation of the vacuum generator configured as described above will be explained with reference to FIGS. 2 to 4. However, this operation will be described for the case where a plurality of vacuum generating units 10 are arranged in series using the manifold 16 and the boat of the valve mechanism section 14 is closed with a screw. Therefore, the supply of compressed air, the supply pressure for driving the pilot valve, the vacuum breaking pressure, the pilot valve, and the ejector 18
In this operational description, exhaust air is only provided through the manifold 16.

Therefore, a case will be described in which a negative pressure is applied to a working device that communicates with the vacuum port 70, for example, a suction pad.

First, a compressed air supply source such as a compressor (not shown) is energized, the compressed air passes through the pilot valve supply passage 48 of the manifold 16, and the first solenoid valve 40 is energized, so that the compressed air is supplied as air. Valve 36 is opened. Therefore, the air supply passage 46 of the manifold 16 and the ejector 18 communicate with each other, and compressed air is supplied to the ejector 18. In this way, negative pressure is generated in the ejector 18, and the air from the suction pad is sucked. This negative pressure opens a check valve 76 formed of a flexible member. That is, due to the negative pressure, the air on the vacuum port 70 side passes through the filter section 20 for removing dust, the passage 78, and the vacuum generating section 61.
It is sucked into the differential user section 60. At this time, the vacuum switch 68 of the detection B22, which is connected to the vacuum port 70 through the passage 72, measures the negative pressure, and the working equipment is controlled by the output signal.

On the other hand, the air sucked into the differential user section 60 from the vacuum port 70 and the compressed air ejected from the nozzle section 58 pass through the slot 63 of the lid member 64 from the differential user section 60, and then pass through the filter 66 and the opening. 62 and is discharged from the pilot valve exhaust passage 52 of the manifold 16.

Note that when releasing the negative pressure applied to the work equipment, the second solenoid valve 42 is energized to close the air supply valve 36, and with no compressed air flowing into the passage 54 and the ejector 18,
Initially, a compressed air supply source, such as a compressor (not shown), is energized and compressed air passes through the pilot valve supply passage 48 of the manifold 16. By energizing the third solenoid valve 44, the vacuum breaker valve 38 is opened. As such, the vacuum break passage 50 of the manifold 16 communicates directly with the vacuum port 70 via the passage 56 to release the negative pressure in the work equipment. At this time, the compressed air goes to the work equipment and at the same time filter B
20, opens the check valve 76 through the passage 78, and reaches the ejector 18. Therefore, it is sucked in from the working equipment in a negative pressure state, and the filter part 20, the passage 78 and the ejector]
8, the compressed air tries to flow into the valve mechanism 814 of the nozzle section 58 of the ejector 18, but this is blocked by the check valve 57 (see Fig. 3a).
reference). As a result, dust, oil, etc. from the intake air do not adhere to the air supply valve 36. Therefore, there is no fear that the performance and durability of the air supply valve 36 will deteriorate due to contamination of the intake air. Further, since the compressed air does not flow into the passage 54 and the valve mechanism section 14, it can be used more effectively to release the negative pressure of the working equipment, and the time required to release the negative pressure is shortened.

[Effects of the Invention] As described above, in the vacuum generation unit according to the present invention,
It has the following effects or advantages.

In other words, by providing a check valve in the passage that communicates the air supply valve and the ejector, when the negative pressure of the work equipment is released, the suction air stagnant inside the vacuum generation unit is supplied from the vacuum port through the ejector. Prevent it from reaching the valve. Therefore, there is no fear that the performance and durability of the air supply valve will deteriorate due to contamination of the incoming air.

Furthermore, since the compressed air does not flow into the passage and the valve mechanism, it can be used more effectively to release the negative pressure of the working equipment, and the time required to release the negative pressure can also be reduced. This means, for example, that the conveyance cycle can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the vacuum generation unit according to the present invention, Fig. 2 is a vertical sectional view of an embodiment of the vacuum generation unit according to the invention, and Fig. 3 a and b are checks of the present invention. FIG. 4 is a pneumatic circuit diagram for explaining the fluid passage formed in the embodiment of the vacuum generating unit according to the present invention. 10... Vacuum generation unit 12... Solenoid valve section 14... Valve mechanism section 16... Manifold 18... Ejector 20... Filter section 22... Detection section 36... Air supply Valve 38...Vacuum break valve 46...Air supply passage 48...Pilot valve supply passage 50...Vacuum break passage 52...Pilot valve exhaust passage 54.56.72.78... Passage 57.76...Check valve

Claims (1)

[Claims] (1) A vacuum generation unit, which includes at least an ejector and a valve mechanism that supplies or shuts off compressed air to the ejector, and a passage that communicates with a compressed air introduction port of the ejector. A vacuum generating unit characterized in that a check valve is provided to prevent air from flowing into the valve mechanism.