JPH07222942A - Liquid spraying apparatus - Google Patents

Abstract

PURPOSE:To optionally select the size and the installation position of a liquid tank and prevent a liquid from accumulating in the tip of a nozzle. CONSTITUTION:An air jetting outlet 42 communicating with a compressed air source and a liquid supplying outlet communicating with a liquid tank 11 are placed in the same axial line and a flow rate adjusting apparatus 2 to adjust the compressed air quantity and the liquid quantity is installed in the upper stream side of them. The liquid tank 11 of a liquid to be sprayed is installed under the flow rate-adjusting apparatus 2 and a check valve 23 is set in the route between the liquid tank 11 and the flow rate-adjusting apparatus 2. The flow route of the compressed air adjacently connected with the upper stream side of the air jetting outlet 42 is made to be a parallel flow region 41 in which the flow route cross section area does not change and the liquid supplying outlet 39 is opened in the parallel flow region 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a lathe, a drilling machine, a press machine or the like, and sprays a working fluid or cutting oil on the surface of a workpiece to be machined by these machines or blows air to clean the surface of the workpiece. It relates to a liquid spraying device used for carrying out.

[0002]

5 and 6 show a conventional liquid spraying device of this type. This apparatus includes a base 51 having a magnet for fixing it to a lathe, and the base 51.
And a pedestal 52 that holds the liquid tank 11 is provided at the upper end of the column 1. The column 1 is provided with a flow rate adjuster 2 which can be fixed by a screw 3, a liquid pipe 12 communicating with a liquid tank 11 is connected to an upper surface thereof, and an air pipe 8 communicating with a compressed air source is connected to a lower surface thereof. Has been done. On the tip side surface of the flow rate controller 2, the injection nozzle 5 is provided via a double-structured injection pipe 31.
4 are provided.

FIG. 6 is a sectional view of an injection nozzle. The outer pipe 32 of the injection pipe 31 communicates with the air flow passage of the flow rate controller 2, and the inner pipe 33 communicates with the liquid flow passage. The inner tube 33 projects from the tip of the outer tube 32, and the nozzle 3 is provided with a conical air flow path through the connecting material 35 at the tip of the outer tube.
6 is fixed and the nozzle 36 covers the protrusion of the inner tube. An air jet port 42 is opened at the tip of the nozzle 36, and a liquid supply port 39 at the tip of the inner pipe 33 is opened at the same position as the air jet port 42. That is, the air injection port 42
Has a ring-shaped opening around the liquid supply port 39.

In the conventional liquid spraying device having the above structure, the flow rates of the compressed air and the liquid to be sprayed are set in advance by the flow rate controller 2, and when spraying the liquid, the valve provided in the liquid pipe is opened to flow the liquid down. It is what makes me. The compressed air passes through the outer pipe 32 and is throttled in the conical passage of the nozzle 36,
The liquid flowing out from the liquid supply port 39 is atomized and jetted from the air jet port 42, and liquids such as machining fluid and cutting oil are attached to the surface of the work.

[0005]

However, the conventional device has the following problems.
Liquid tank 1 because it uses the free fall of liquid
1 has to be provided at a position higher than the flow rate controller 2, which has a drawback that the installation position of the liquid tank is limited and the device becomes unstable. Further, there is a drawback that the size of the liquid tank is limited and the liquid tank cannot be used for a long time. Further, if there is a leak in the valve provided in the liquid pipe, the leaked liquid accumulates at the tip of the nozzle and drops as droplets at the start of injection.

An object of the present invention is to solve the above-mentioned drawbacks, and an object of the present invention is to provide a liquid spraying device in which the size and installation position of a liquid tank can be freely selected and no accumulation occurs at the tip of a nozzle. There is.

[0007]

The liquid spraying device according to the present invention has an air injection port 42 communicating with a compressed air source and a liquid supply port 39 communicating with the liquid tank 11. The air injection port 42 and the liquid supply port 39 are arranged on the same axis, and the flow rate controller 2 for adjusting the outflow amount of the compressed air and the liquid is provided on the upstream side of these. Flow controller 2
Liquid such as machining fluid or cutting oil flowing out of the liquid supply port 39 is discharged from the air injection port 42 in the form of mist.

In the apparatus of the present invention, the liquid tank 11 for the liquid to be sprayed is arranged below the flow rate controller 2, and the check valve 23 is provided in the path from the liquid tank 11 to the flow rate controller 2. There is. Further, the flow path of the compressed air connected to the upstream side of the air injection port 42 is a parallel flow region 41 in which the flow path cross-sectional area does not change, and the liquid supply port 39 is opened in this parallel flow region 41.

[0009]

In the liquid spraying apparatus of the present invention, the liquid can be discharged from the liquid supply port by using the negative pressure, the liquid tank 11 can be installed below the air injection port, and the air injection port 42 can be installed. Since the liquid supply port 39 is opened in the parallel flow region 41 provided on the upstream side of the liquid, atomization of the liquid is good, and droplets are not scattered. Further, since the check valve 23 is provided in the path from the liquid tank 11 to the liquid supply port 39,
The liquid can always be retained in the liquid supply port, the liquid is supplied at the same time when the injection of air is started, and efficient spraying work can be performed. Further, even if there is a leak in the check valve 23, a slight waiting time is required for starting spraying,
Droplets do not collect in the liquid supply port 39.

[0010]

1 and 2 show a first embodiment of the present invention. In the liquid spraying apparatus of this embodiment, a column 1 is erected on a base (not shown) having a magnet for fixing it on a lathe and the like, and a flow controller 2 is installed on the column 1.
Is provided so that it can be raised and lowered and can be fixed with screws 3. The body 4 of the flow rate regulator is provided with two parallel communicating holes 5 and 6 extending in the vertical direction, and an air communicating with a valve 7 of a time-closed type is provided at the lower opening of the communicating hole 5 on the left side in the figure. The pipe 8 is connected through a joint 13, and the communication hole 6 on the right side of the drawing is shown.
A liquid pipe 12 communicating with the liquid tank 11 is connected to a lower opening of the via a joint 13.

Large-diameter holes 14 and 15 each having a female screw on the peripheral surface are provided at the upper opening of each communicating hole, and the large-diameter hole 14 on the left side of the drawing is provided coaxially with the communicating hole 5. An air passage 16 extending in an L shape from the eccentric position to the right end surface of the main body is provided. The large diameter hole 15 on the right side of the figure
Is eccentrically provided in the communication hole 6, and a liquid flow path 17 extending in an L shape from the center thereof to the right end surface of the main body is provided. The knobs 18 and 19 are screwed into the large-diameter holes 14 and 15, and the needle 21 provided at the tip of the knob 18 for adjusting the air flow rate is brought into and out of contact with the communication hole 5 to adjust the clearance through which the compressed air passes. . The needle 22 provided at the tip of the knob 19 for adjusting the liquid flow rate is brought into contact with or separated from the liquid flow path 17 to adjust the clearance through which the liquid passes.

A ball check valve 23 is provided at the base end of the liquid pipe 12. Ball check valve has a central hole 2
4 and a connecting body 26 that attaches the valve body 25 to the liquid pipe 12. A valve seat 27 is provided in the middle of the center hole 24, and a ball 28 fitted on the larger diameter side abuts the valve seat 27 to close the center hole 24.

The air passage 16 and the liquid flow path 17 of the flow rate controller 2
And are communicated with the outer pipe 32 and the inner pipe 33 of the double-structured injection pipe 31, which is fixed to the main body of the flow rate controller with the fixture 29. The injection pipe 31 is made of annealed copper,
It can be bent in any direction. The inner tube 33 has a tip projecting further than the tip of the outer tube 32, and a cube-shaped brim 34 is fixed to the projecting portion.

A nozzle 36 is provided at the tip of the outer tube via a connecting material 35. On the inner diameter side of the nozzle 36,
A small diameter nozzle hole 38 is formed through the step portion 37.
This nozzle hole is a straight hole whose section does not change. The inner tube is held on the same axis as the nozzle hole 34 by the collar 34, and a parallel flow region 41 of compressed air is formed between the inner peripheral surface of the nozzle hole and the outer peripheral surface of the inner tube.
Then, in the middle of the parallel flow region 41, the liquid supply port 3 of the inner pipe is provided.
9 is open.

Next, the operation of the liquid spraying device of this embodiment will be described. The knobs 18 and 19 are operated in advance to adjust the flow rates of the compressed air and the liquid. The timed-closed valve 7 is operated to inject compressed air for a certain period of time. The compressed air passing through the parallel flow region 41 causes the liquid supply port 39 to have a negative pressure, the ball check valve 23 opens, and the liquid in the liquid tank flows out from the liquid supply port 39 through the liquid pipe 12 and the liquid flow path 17. The liquid that has flowed out is ejected in a mist form from the air injection port 42 by the compressed air that has passed through the parallel flow region, and adheres to the surface of the work. When the operating time has elapsed and the valve 7 is closed, the compressed air flowing in the parallel flow region 41 stops and the liquid supply port returns to the atmospheric pressure, so that the liquid outflow from the liquid supply port also stops. At the same time, the ball 28 comes into contact with the valve seat 27 to close the central hole, so that backflow of the liquid in the liquid pipe 12 and the liquid flow path 17 is prevented. Therefore, the liquid is always exposed to the liquid supply port 39, and the next spraying work can be started without waiting time by operating the time-closed valve.

FIGS. 3 and 4 show a second embodiment of the present invention. The flow rate controller 2 is provided with a through hole 43 on the left side of the main body 4 in a direction perpendicular to the plane of FIG.
A communication hole 5 extending from the through hole 43 in the tangential direction thereof is open at the left end surface of the main body. A large-diameter hole 14 coaxial with the communication hole 5 is provided at the opening of the communication hole 5, and an air passage 16 extends from the eccentric position of the large-diameter hole to the right end surface of the main body. A knob 18 is screwed into the large-diameter hole 14, and a needle 21 provided at the tip of the knob 18 is brought into contact with or separated from the communication hole 5 to adjust the interval at which compressed air passes.

A communication hole 6 communicating with the liquid tank 11 via a joint 13 is provided on the right side surface of the main body of the flow rate controller 2, and a large diameter hole 15 is provided in a direction orthogonal to the communication hole. ing. A knob 19 is screwed into the large-diameter hole 15, and the large-diameter hole 15 and the communication hole 6 communicate with each other at the tip portion.
A liquid passage 17 is provided in the large-diameter hole 15 coaxially therewith, and a needle 22 provided at the tip of the knob 19 is attached to the liquid passage 17
The gap through which the liquid passes is adjusted by contacting and separating. The front side opening of the through hole of the flow rate controller 2 is closed by the timer 45, and the back side opening is closed by the closing plate 46. Timer 4
The valve 5 has a built-in open / close valve. One end of the valve opens into the through hole 43 and the other end opens into the air pipe 8.

[0018]

As described above, in the liquid spraying device of the present invention, the injection nozzle is provided with the parallel flow region of the compressed air, and the liquid supply port is opened in this parallel flow region, which is suitable for the liquid supply port. Negative pressure acts to reliably spray the liquid, and atomization of the liquid is sure to prevent the liquid droplets from scattering. Further, since the liquid is sucked up by using the negative pressure, the liquid tank can be installed at an arbitrary position and its size is not limited. Further, it is not necessary to provide a cradle, and the stability of the device is improved. Further, since the backflow prevention valve is provided in the path from the liquid tank to the liquid supply port, the liquid can be always retained in the liquid supply port, and the liquid is supplied at the same time when the injection of compressed air is started, so that there is no waiting time Can perform spraying work. Even if the check valve leaks, a slight waiting time is required for starting the spraying, and it is possible to prevent the liquid droplets from accumulating at the tip of the injection nozzle.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a first embodiment.

FIG. 2 is a sectional perspective view of an injection nozzle.

FIG. 3 is a sectional view of an essential part of the second embodiment.

FIG. 4 is a sectional view of part A in FIG.

FIG. 5 is a schematic diagram of a conventional liquid spraying device.

FIG. 6 is a sectional view of a conventional spray nozzle.

[Explanation of symbols]

 2 Flow rate controller 11 Liquid tank 39 Liquid supply port 41 Parallel flow region 42 Air injection port

Claims (1)

[Claims] 1. An air injection port (42) and a liquid supply port (39) having an air injection port (42) communicating with a compressed air source and a liquid supply port (39) communicating with a liquid tank (11). Is located on the same axis and a flow rate controller (2) for adjusting the outflow rate of compressed air and liquid is installed on the upstream side, and the compressed air from the flow rate controller (2) is used to supply liquid (39). ), The liquid tank (11) is arranged below the flow rate controller (2), and is connected to the upstream side of the air injection port (42) by the air. A parallel flow region (41) for guiding the flow in parallel is provided,
To the downstream side of the flow path of this parallel flow region (41), the liquid supply port (3
9) Open the liquid tank (11) and adjust the flow controller.
A liquid spraying device, characterized in that a check valve (23) is provided in the path leading to (2).