JP3320018B2 - Mist generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mist generating device for generating a mist to be supplied to a processing point of a machine tool, for example.

[0002]

2. Description of the Related Art Generally, when a work is machined by a machine tool, it is necessary to spray a large amount of oil for lubrication or cooling from a nozzle to a work point. At this time, the oil is injected through a spindle-through system, that is, through the inside of the spindle of the machine tool or directly without passing through the inside of the spindle.

However, when the oil is sprayed from the nozzle, the oil also scatters around the processing point, so that it often pollutes the environment and adversely affects the human body. Further, since the oil is circulated and used, a means for cooling the oil is required. Further, even if the oil is cooled, bacteria may be generated in the oil, so that the oil may rot.

[0004] In order to overcome such adverse effects, "processing using no oil as much as possible" or "processing using no oil" has recently been put into practice. In particular,
The latter “processing that does not use oil at all” is called dry cutting, and an apparatus for performing this dry cutting is commercialized also as, for example, a cold air processing apparatus. The cold air processing apparatus improves the cooling efficiency and the processing efficiency of the machine tool by injecting compressed air at an extremely low temperature of about −30 to −40 ° C. to the processing point.

[0005]

However, the above-mentioned "machining without using oil as much as possible" is a system in which a very small amount of oil is mist-supplied, that is, a so-called micro lubrication (MQ).
L: Minimum Quantitation Lubrication
A mist in which large particles and small particles are mixed is supplied from a mist generator to a processing point.

[0006] For this reason, there is no problem when the mist is directly jetted to the processing point. However, when the mist is jetted by the spindle through method, the mist of particles larger than the centrifugal force of the spindle rotating at a high speed adheres to the inner wall of the spindle. ,
The amount of the mist that can reach the processing point becomes smaller than the amount of the supplied mist, and the cooling efficiency and the processing efficiency of the machine tool may be reduced. Further, when the rotation of the spindle stops, the oil adhering to the inner wall of the spindle falls on the work through the tool and easily contaminates the work and the environment.

[0007] On the other hand, a cold air processing apparatus that performs the above-mentioned "processing using no oil" requires a means for generating cold air, and the material of the work may be limited. For example, when performing iron-based processing, it is necessary to supply a small amount of oil together with cold air, so that control is complicated and the cost of the cold air processing apparatus is increased.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a mist generating device capable of generating a mist composed of only uniform small particles.

[0009]

A mist generating apparatus according to the present invention for achieving the above object comprises a spray nozzle for mixing a liquid and a gas to spray a mist, and an inner tank having the spray nozzle at an upper part thereof. An outer tank which is arranged outside the inner tank and accommodates the liquid at the lower part and contains the generated mist at the upper part and also has a mist outlet, and the inner tank is wound and arranged and the inlet is arranged at the inner tank. A spiral tube passage open to the outer tank with an outlet positioned below the inlet, the inner tank containing the primary mist generated by the spray nozzle and large particles in the primary mist. Is attached to the inner wall to obtain a secondary mist of small particles, and the spiral pipe passage attaches large particles in the secondary mist obtained in the inner tank to the inner wall of the passage to form small particles. And to obtain a tertiary mist, it said outer tank is characterized in that it is assumed that houses the tertiary mist discharged from the spiral tube passage.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment.

FIG. 1 is a sectional view of the first embodiment, FIG. 2 is a front view, and FIG. 3 is a block diagram. For example, the inside of a substantially rectangular cylindrical tank 1 is vertically partitioned by a partition plate 2. The oil 3 is stored below the partition plate 2. The partition plate 2 is formed with a central oil passage 2a through which the oil 3 flows and a peripheral oil passage 2b.

A cylindrical body 4 having a top plate 4a is fixed to an upper part of the partition plate 2 provided with the oil through hole 2a. The inside of the cylindrical body 4 is an internal oil mist chamber 5, The outside of 4 is an external oil mist chamber 6 having an oil passage 2b. A spray nozzle 7 for turning the oil 3 into mist is provided on the top plate 4 a of the tubular body 4. A pump 8 for pumping the oil 3 to the spray nozzle 7 is provided on the outer surface of the bottom wall of the tank 1.
Is provided on the top wall of the tank 1, and an outlet 9 for taking out the mist toward, for example, a machine tool is provided.

The pump 8 has a plunger 11 for pressurizing the oil 3 introduced through the passage 1a of the tank 1 and the suction passage 8a of the pump 8, an operating section 12 for operating the plunger 11 manually or by air pressure, A check valve 13 for allowing the oil 3 to flow only in one direction and a drain cock 14 used for discharging the oil 3 out of the tank 1 are provided. The pump 8 is capable of so-called pulse lubrication in which the plunger 11 is repeatedly turned on and off at predetermined time intervals to supply a constant amount of oil.

FIG. 4 is a sectional view of the cylindrical body 4 and the spray nozzle 7. The spray nozzle 7 has a vertical passage 7a extending vertically to the internal oil mist chamber 5, and a horizontal passage 7b communicating horizontally with the vertical passage 7a. Are formed. The discharge path 8b of the pump 8 is
It is connected to the vertical passage 7a of the spray nozzle 7 through the hole 1b of the tank 1 and the first tube 15.

A pressure air source 16 is connected to the horizontal passage 7b of the spray nozzle 7 via a second pipe 17 passing through the inside of the tank 1. The pressure air source 16 is also connected to the external oil fog chamber 6 via a third pipe 18 passing through the inside of the tank 1. The third pipe 18 is provided with a pressure adjustment valve 19 for adjusting the pressure of the external oil mist chamber 6.

On the side wall of the tank 1, a plug 21 for supplying the oil 3 to the inside of the tank 1, a liquid level gauge 22 indicating the surface position of the oil 3, and the pressure of the external oil mist chamber 6 are indicated. Pressure gauge 23 and adjustment knob 1 of pressure adjustment valve 19
9 'and a timer 2 for adjusting the frequency of reciprocation of the plunger 11
5 are provided.

Here, as shown in the perspective view of the main part of FIG.
A connection block 31 is provided above the side wall of the tubular body 4, and a fourth pipe 32 is spirally wound around the outer peripheral surface of the sidewall of the tubular body 4. The internal opening 3 of the fourth tube 32
2 a is connected to the connection block 31, and the external opening 32 b is arranged below the external oil mist chamber 6.

The pressurized air from the pressurized air source 16 flows into the vertical passage 7a from the bottom of the tank 1 through the second pipe 17 and the horizontal passage 7b of the spray nozzle 7. On the other hand, pump 8
The quantity of oil 3 caused by the action of (1) flows through the first pipe 15 into the vertical passage 7a of the spray nozzle 7. Thus, the primary mist in which the air and the oil 3 are mixed is jetted from the spray nozzle 7 into the internal oil mist chamber 5.

The primary mist spouted from the spray nozzle 7 fills the internal oil mist chamber 5, during which the large particles 3 a in the primary mist adhere to the inner wall of the cylindrical body 4, and the small particles 3 a Only secondary mist consisting of particles remains. Then, the large particles 3a attached to the cylindrical body 4 are liquefied and
From the oil through hole 2a into the original oil 3.

Subsequently, the secondary mist is ejected from the connection block 31 to the external oil mist chamber 6 through the fourth pipe 32. At this time, since the fourth tube 32 is spiral, the secondary mist passes through the fourth tube 32, that is, a thin tube, so that the mist passing speed increases, and the speed of collision with the inner wall also increases. Larger particles are more likely to adhere to the inner wall. Further, under the centrifugal force caused by passing through the spiral groove, large particles in the secondary mist adhere to the inner wall of the fourth tubular body 32, and only the tertiary mist composed of small particles passes through the external opening 32b through the external oil mist chamber 6 Spouts. Large particles adhering to the inner wall of the tube 32 are transmitted through the inner wall to the outer oil mist chamber 6 through the outer opening 32b.
Drop into.

The tertiary mist that has entered the external oil mist chamber 6 rises from the lower part to the upper part. During this time, large particles in the tertiary mist adhere to the inner wall of the tank 1, and the tertiary mist consisting of only small particles is formed. Occurs. And the external oil mist chamber 6
The large particles liquefied and collected at the bottom of the partition plate fall into the oil 3 from the oil passage 2b of the partition plate 2, and the quaternary mist can be taken out from the outlet 9 toward, for example, a machine tool (not shown). .

As described above, in the first embodiment, since the large particles are sequentially separated from the mist in the internal oil mist chamber 5, the fourth tube 32, and the external oil mist chamber 6, only the uniform small particles are separated. Can be generated. Therefore, when the mist taken out from the outlet 9 is supplied to the processing point through the internal passage of the spindle of the machine tool,
The mist is less likely to adhere to the inner wall of the internal passage, the micro lubrication system can be satisfied, and the supply and consumption of the oil 3 can be reliably reduced.

FIG. 6 is a perspective view of a main part of the second embodiment.
Instead of the fourth tube 32 of the first embodiment, a straight fifth
Is provided. The inner diameter of the fifth tube 33 is gradually reduced from the inner opening 33a toward the outer opening 33b, and the inner opening 33a is connected to the connection block 31 of the tubular body 4.
And the external opening 33b is arranged so that the secondary mist can collide with the inner wall of the tank 1.

In the second embodiment, since the diameter of the fifth tube 33 is reduced from the inner opening 33a to the outer opening 33b, the secondary mist is not passed when passing through the fifth tube 33. It accelerates and collides with the inner wall of the tank 1. As a result, large particles in the secondary mist adhere to the inner wall, and a tertiary mist is generated. Otherwise, the same effects as in the first embodiment can be achieved.

In the first and second embodiments described above, one spray nozzle 7 is provided toward the inside of the cylindrical body 4, but a plurality of spray nozzles 7 may be provided. The discharge frequency of the pump 8 was adjusted by the operation of the check valve 13,
As a means for operating the check valve 13, a conventional means can be used. The pipes 15, 17, and 18 pass through the oil 3, but can be directly introduced into the external oil mist chamber 6 without passing through the oil 3. In addition, outlet 9
Is one, but may be plural. Although the fifth tube 33 of the second embodiment causes the secondary mist to collide with the inner wall of the tank 1, it may collide with a separately provided plate body instead of the inner wall. .

[0026]

As described above, in the mist generating apparatus according to the present invention, the large particles in the primary mist obtained by the spray nozzle in the inner tank are adhered to the inner wall to obtain the secondary mist of the small particles, and the spiral is formed. In the pipe passage, large particles in the secondary mist are adhered to the inner wall of the passage to obtain a tertiary mist of small particles and discharged into the outer tank. Can be.

[Brief description of the drawings]

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

FIG. 2 is a front view.

FIG. 3 is a block diagram.

FIG. 4 is a sectional view of a cylindrical body and a nozzle.

FIG. 5 is a perspective view of a main part.

FIG. 6 is a perspective view of a main part of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank 2 Partition plate 2a, 2b Oil through hole 3 Oil 4 Cylindrical body 5 Internal oil mist chamber 6 External oil mist chamber 7 Spray nozzle 8 Pump 9 Outlet 16 Pressure air source 19 Pressure regulating valve 32 Fourth pipe 33 Fifth tube

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16N 7/32 B23Q 11/10

Claims (2)

(57) [Claims] 1. A mist is injected by mixing a liquid and a gas.
Spray nozzle and inner tank having the spray nozzle on top
And disposed outside the inner tank and accommodates the liquid at a lower portion.
The mist generated at the top is stored and the mist outlet
The outer tank provided with a, and the inner tank is wound and arranged.
Connect the inlet to the inner tank and the outlet below the inlet
A helical tube passage open into the outer tank
And the inner tank has a nozzle formed by the spray nozzle.
Accommodates the secondary mist and removes the large particles in the primary mist from the inner wall
To obtain a secondary mist of small particles,
The spiral pipe passage is provided with the secondary mixer obtained in the inner tank.
Large particles in the strike are attached to the inner wall of the passage and small particles
Tertiary mist of the outer tank
Containing the tertiary mist discharged from the spiral passage
Mist generating apparatus characterized by the the. 2. A hole is provided in a bottom wall of the inner tank,
Drops droplets of large particles separated in the inner tank
The mist generating device according to claim 1, wherein the mist generating device is returned to a lower portion of the tank .