JPS588960Y2 - vacuum generator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vacuum generating device used for suctioning and moving various articles.

Recently, suction cups and the like have been used as a means for supplying, moving, and taking out articles in various automatic machines, labor-saving machines, etc.
A vacuum pump controls the vacuum area inside the suction cup.

However, vacuum pumps have the disadvantage of being large and expensive.

In this invention, we use a so-called gas nitrogen generator as a vacuum generator.
A pump is used.

That is, the gas nitrogen pump injects and discharges compressed air toward a conical hole in the compartment to create a negative pressure in the compartment,
A suction hose is provided from one side wall of the compartment to maintain a vacuum area inside the suction cup, and it can be provided in an extremely small size and at low cost.

However, in conventional gas NJF coupon pumps, in order to maintain the vacuum area inside the suction cup, it is necessary to constantly inject compressed air toward the conical hole in the compartment, which is extremely uneconomical. was there.

Therefore, if the interior of the suction cup or the like becomes a vacuum region, it would be extremely economical to stop the injection and discharge of compressed air and maintain the vacuum region.

However, in conventional gas NJF coupon pumps of this type, it was considered difficult to do so because the conical hole in the compartment through which compressed air is injected and discharged communicates with the outside air.

The present invention eliminates the above drawbacks,
Furthermore, the apparatus is constructed so that the injection and discharge of compressed air is stopped at a predetermined degree of vacuum, and is therefore characterized by being extremely economical.

An embodiment of the present invention will be described in detail below with reference to the drawings.

The gas NJF coupon pump a is provided with a supply hole 1 for compressed air, and a compressor or the like (not shown) is connected to the supply hole 1, for example.

Next, a nozzle hole 2 is provided at the tip of the supply hole 1, and the nozzle hole 2 opens into a compartment 3 configured in advance in the gas engine coupon a. A conical hole 4 is provided at a position facing the.

Furthermore, an intake hole 5 is separately provided on one side wall of the compartment 3,
An intake hose 6 or the like is attached to the intake hole 5 as necessary, and a suction cup 7 or the like is further provided at the tip thereof.

8 in the figure is a silencer. In the above configuration, when compressed air is supplied from the nozzle hole 2 at the tip of the supply hole 1, the compressed air is injected and released from the nozzle hole 2 to the conical hole 4, and the injection emission sound is muffled by the silencer 8, and the air inside the compartment 3 is becomes a negative pressure, the air in the intake hole 5, the intake hose 6, and the suction cup 7 is released, and the inside of the suction cup 7 becomes a vacuum region.

In the above configuration, in the present invention, a check valve 9 is provided at the tip of the conical hole 4, and is opened when the compressed air is ejected from the nozzle hole 2, and is automatically closed when the ejection is stopped.
It is intended to provide

Note that the check valve 9 may be constituted by a ball 11 that is lightly pressed against the tip of the conical hole 4 by a spring 10 as shown in the first figure, or a valve plate whose lower end opens and closes as shown in the third figure. 12.

In any case, the check valve 9 is configured to be completely sealed when it is opened slightly by the injection of compressed air from the nozzle hole 2 and automatically closed.

In the present invention having the above configuration, when compressed air is injected and discharged from the nozzle hole 2, the check valve 9 is opened and the inside of the suction cup 7 becomes a vacuum region as described above.

Next, when the inside of the suction cup 7 reaches a predetermined vacuum region and the injection and release of compressed air is stopped, the check valve 9 is automatically closed, and as long as no air is supplied from the nozzle hole 2 side,
A vacuum region inside the compartment 3, conical hole 4, suction hole 5, suction hose 6, and suction cup 7 is maintained, and during this time, the suction cup 7 is used to move the article 13, etc. while the injection and discharge of compressed air is stopped. can be done.

Next, even when the vacuum state is maintained, some air may flow in from the suction cup 7, check valve 9, one part of the compressed air supply hole, or other parts where the intake hose 6 is attached, resulting in a decrease in the degree of vacuum. There are cases.

In such a case, the present invention only needs to confirm the state of the vacuum region while injecting and discharging the compressed air and stopping it.

An example of this will be explained with reference to the drawings.

The inventor of this invention has already registered utility model No. 1185723 (Utility Model No. 1185723 (Utility Model Publication No. 51-4486) as a vacuum source with vacuum status confirmation device.
4).

That is, to explain the above-mentioned registered utility model with reference to FIGS. 1 and 2, there is a spacer in another compartment 13 that communicates with the compartment 3 which is the vacuum region in the gas ejector pump a, and which resists the spring 14 in the vacuum region. A sliding piston 15 is provided, and a pin 17 is implanted in the piston 15 to actuate a separately provided microswitch 16 when the piston 15 slides.

If the present invention is used in combination with the above-mentioned registered utility model, even more economical effects can be obtained.

That is, when compressed air is supplied from the compressed air nozzle hole 2 and a predetermined degree of vacuum is obtained on the side of the compartment 3, intake hole 5, intake hose 6, and suction cup 7, the piston 15 moves toward the spring 14.
is pressed and slid to cause the microswitch 16 to connect or otherwise operate.

The microswitch 16 is configured to stop a compressed air supply source connected to the compressed air supply hole 1, such as a compressor.

As a result, the supply of compressed air is stopped, the check valve 9 is closed, the compartment 3, the intake hole 5, the intake hose 6, and the suction cup 7 are maintained at a predetermined degree of vacuum, and the suction cup 7 moves the articles. can be made equal.

Next, when the degree of vacuum falls below a predetermined value, the piston 15 is returned to its original position by the spring 14, and the microswitch 16 is disconnected.

In that case, if the compressed air supply source, such as a compressor, is configured to operate automatically in advance, the compressed air will be injected and discharged again, and the check valve 9 will be opened to maintain the predetermined degree of vacuum. It is possible.

In Fig. 3, the above-mentioned vacuum state confirmation device is installed at an appropriate position on the intake hose 6 separately from the gas NJF coupon a, a bellows 18 is used instead of the piston, and a strain gauge 19 is used instead of the micro switch. An example is shown.

The strain gauge 19 is composed of a sensor plate 20 and strain sensors 21 and 22 on the front and back sides of which the resistance value changes depending on the strain, and can obtain an electric signal due to the strain.One end is connected to the support column 23 which is a fixed member. The other end is fixed to the bellows 18 side, and the bellows 18 is attached due to the vacuum inside the compartment 13.
The strain gauge 19 is configured so that a strain occurs when the strain gauge 19 is contracted.

Therefore, if the vacuum state is confirmed by the strain gauge 19 and the compressed air supply source, such as a compressor, is controlled by the electric signal from the strain gauge 19, the same effects as in the embodiments shown in FIGS. 1 and 2 can be obtained. It is something.

As mentioned above, the present invention injects compressed air from the nozzle hole toward the conical hole in the compartment to create a negative pressure in the compartment,
A gas NJF coupon with an intake hole on its side wall is equipped with a check valve at the tip of the conical hole that opens when the compressed air is jetted out from the nozzle hole and is closed when the jetting stops. As a result, even if the supply of compressed air is stopped after a predetermined degree of vacuum is obtained, the degree of vacuum can be maintained, thus saving compressed air, which has an extremely economical effect. It is something.

In order to obtain the same effect as above, it is possible to electrically control the appropriate position on the intake hole side using a signal from a vacuum status confirmation device, but in that case, a separate control device is required. It is also possible to stop the supply of compressed air based on empirical rules based on the supply amount of compressed air and move the article using a suction cup or the like, without using a status checking device.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a cross-sectional view of the main part showing its usage state, Fig. 2 is a front view of a gaseous NJF coupon pump, and Fig. 3 shows another embodiment. FIG. 3 is a cross-sectional view of the main parts showing the state of use. 1... (compressed air) supply hole, 2...
Nozzle hole, 3... Compartment, 4... Conical hole, 5... Intake hole, 9... Check valve, a...・Gas Nijiev Couponpu.

Claims (1)

[Scope of utility model registration request] Compressed air is injected and discharged from a nozzle hole toward a conical hole in a compartment to create a negative pressure in the compartment, and in a gas nitrogen pump having an intake hole on the side wall thereof, the tip of the conical hole is 1. A vacuum generator comprising a check valve that is opened when compressed air is ejected from a nozzle hole and closed when the ejection is stopped.