JP2001082685A - Circulation type fixed discharge spray lubrication method and the fixed discharge spray lubrication device - Google Patents

Abstract

(57) [Summary] The atomization rate differs depending on the type of lubricating oil, even if the conditions such as supply air pressure, air flow rate, ambient temperature, oil temperature, etc. are the same. A filter / regulator (1), an air switching valve (2), an oil mist generator (B) connected to a passage (3) on one side of the air switching valve (2), and a passage (4) on the other side of the air switching valve (2). And a fixed-quantity oil supply pump 12 provided. The oil fog generator B includes a site dome 6 for monitoring oil drop, a venturi mechanism 5, and an oil return line 15 for returning the oil accumulated at the bottom of the pressurized oil tank 8 to the venturi mechanism 5 again. Using the negative pressure generated by the compressed air flowing through the venturi mechanism 5, the oil stored in the bottom of the pressurized oil tank 8 is forcibly sucked up in the oil return line 15 and returned to the return oil inflow chamber 5b. By passing through the venturi mechanism 5, atomization is performed continuously, and as long as stored oil is present in the pressurized oil tank, oil mist can be continuously supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the improvement of a spray lubricating device for supplying lubricating oil to a sliding part and a rolling part by atomizing lubricating oil to various rolling elements, such as various bearings, gears and slides. The present invention provides a useful circulation type constant discharge spray lubrication method and a constant discharge spray lubrication apparatus capable of continuously supplying a constant amount of oil mist per unit time for a long period of time.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 3, the transportation and distribution of oil mist from a spraying device to a fueling point is performed by a pipe 21 and a nozzle 23 attached to a branch terminal 22. In order to minimize condensation (wet out) of oil fog on the way and to distribute oil fog at the branch point (the amount of oil fog is distributed according to the diameter of each nozzle at the pipe tip) It is necessary to select and discharge only oil mist having a fine particle diameter (for example, a diameter of 2 μm or less) from the spray device 24 (selective spray circulation device).

[0003] As an atomizing mechanism in this selective spray lubrication apparatus, for example, the one shown in FIG. 4 is well known. When the compressed air is introduced into the compressed air inlet 25, the atomizing mechanism makes the inside of the site dome chamber 6a a negative pressure when the compressed air passes through the venturi mechanism (atomizing mechanism) 5, and the oil sucked up from the oil tank 9 causes the oil to be sucked up from the oil dome 9. 6, the solution is dropped into the center of the venturi mechanism 5.

[0004] Next, at the center of the venturi mechanism 5, it is atomized by being mixed with compressed air and ejected downward. At this time, since the oil mist impingement mechanism 7 is arranged in the ejecting direction, the particle size is relatively small. The large oil mist collides with the collision plate 7a, adheres to the collision plate 7a, and falls into the oil tank 9 as oil droplets.

[0005] Next, the oil mist that has passed through the oil mist collision mechanism 7 stays in the oil mist sorting space 8a above the oil tank 9, during which the larger oil particles fall by their own weight and return to the oil tank 9, and Only the fine oil mist that has continued to float in the mist sorting space 8a flows out of the fine oil mist discharge port 14a by the air flow.

[0006] In such a selective spray lubrication apparatus (atomizing mechanism), conditions such as supply air pressure, air flow rate, ambient temperature, oil temperature, etc. are the same depending on the type of lubricating oil used. Even if the atomization rate (siphon tube 27
The drawback is that the ratio of the amount of oil discharged from the device as fine oil mist to the amount of oil sucked up and supplied to the venturi mechanism 5 is different (see FIG. 7).

[0007] The cause is that each lubricant manufacturer mixes various additives such as an oiliness improver, an oxidation stabilizer, an extreme pressure additive, an antifoaming agent, etc. for the purpose of improving the performance as a lubricant.
This is probably because they are commercially available and include high molecular substances which greatly affect atomization characteristics.

Further, the types and amounts of additives used are not disclosed as a trade secret of lubricating oil manufacturers, and even if the same oils and fats are used, the contents of additives are always changed to improve the performance. Subject to change.

Therefore, in such a selective spray lubrication system, it is necessary to confirm the atomization rate of the lubricating oil in advance, and to periodically (or irregularly) use the same lubricating oil. The troubles such as the necessity of evaluating the atomization rate remain.

[0010] Further, there are various factors that cause the fluctuation of the atomization rate even after the lubricating oil to be used is specified and the lubricating apparatus is operated for a certain period of time. For example, when a change or a change in the operating conditions of the spray lubrication device (supply pressure, the amount of air mixed in from the air bypass to the oil mist transfer line, the temperature of the surroundings and oil in the morning and evening or season, etc.) occurs, the atomization is performed. The rate also changes.

[0011] Further, a temporal change caused after the spray lubrication device has been operated for a long period of time (such as a venturi due to contaminants such as oil vapor or dust of compressor oil contained in compressed air, a tip nozzle attached near an oil supply point, etc.) , Etc.) also changes the atomization rate.

[0012] Further, due to the above technical problems, it is difficult to control the absolute amount of oil per unit time contained in the oil mist discharged from the spray lubrication device. That is, the amount of oil supplied to the sight dome 6 can be supplied at a constant rate by installing a metering pump in the oil supply line, but if the atomization rate changes, the amount of oil to be discharged also increases. There is a problem that it fluctuates.

As a result, in order to know the absolute amount of oil discharged from the spray lubrication device 24, the oil level in the oil tank 9 changes.
Although it will be converted and calculated, the amount of change in oil level per unit time is usually very small, and a long time must be passed to obtain effective information, and practical inconvenience remains. .

As measures for solving such technical problems and problems, for example, (A) Japanese Patent Application Laid-Open No. 10-19192
A fixed-discharge spray lubricating device disclosed in Japanese Patent Application Publication No. 2000-209 and (B) Utility Model Registration No. 2580280 is well known as a conventional example.

The prior art (A) of this prior art is disclosed in
As shown in FIG. 5, Japanese Patent Publication No. 19192 discloses changes in operating conditions (supply pressure, air mixing amount from an air bypass to an oil mist conveying line, ambient temperature or oil temperature, etc.) or lubrication used, as shown in FIG. Atomization rate by oil and oil mist transfer line 1
The change in the oil mist concentration in the oil mist transfer line 4 is detected by an oil mist sensor 28 installed in the oil mist transfer line 14, and the amount of oil supply to the venturi mechanism (atomizing mechanism) 5 is controlled to maintain a predetermined concentration. .

Further, (B) Utility Model Registration No. 2580
Japanese Patent Application Publication No. 280 discloses a spray oiling device comprising a venturi mechanism 5 having a spray air supply passage 25 and a pressurized oil tank 8, as shown in FIG. An impact mechanism 7 for colliding the sprayed fog or mist on the ejection side of the venturi mechanism 5 is provided, and the fog or mist containing dust collides with the impingement mechanism 7 so that oil droplets that grow with the dust are provided. The oil which is settled in the pressurized oil tank 8 and has a high content of garbage stored therein and which is hard to be atomized into fine oil is disposed at the bottom of the pressurized oil tank 8 and the suction line of the oil discharge pump 26. By purifying with the filter 11 and returning the oil to the oil tank 9 from the oil discharge pump 26, a stable atomization rate is to be obtained.

[0017]

However, in the above described (A) quantitative discharge spray lubrication apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 10-19192, the oil mist sensor 28 and the oil amount control arithmetic operation system (see FIG. 5 (b)) is expensive and is rarely used except in special cases.

(B) Utility model registration No. 2580280
In the spray refueling device disclosed in Japanese Patent Laid-Open Publication No. H10-150, the amount of supplied oil is made constant using an oil metering discharge pump 12, and contaminants contained in air and oil are removed, so that atomization is performed. Although the aim is to improve the atomization rate and obtain stability by reducing the size of the oil mist particles at the time, all of the above-mentioned problems have not yet been solved.

The present invention has been made in view of such conventional problems, and it is possible to apply a small amount of oil mist per unit time regardless of the type of lubricating oil used and the operating conditions of the spray lubrication device. It is an object of the present invention to provide an inexpensive circulating fixed-rate discharge spray lubrication method and a fixed-rate discharge spray lubrication device capable of continuously supplying a fixed amount per unit for a long period of time.

[0020]

SUMMARY OF THE INVENTION In order to solve the conventional problems as described above and to achieve the intended object, a configuration of the present invention is to supply compressed air after filtration and / or pressure adjustment. After branching the downstream side of the air switching valve of at least 2 ports or more into two, supplying one to the venturi mechanism and the other to the fixed quantity oil supply pump, and when the compressed air passes through the venturi mechanism, A process in which the site dome chamber is set to a negative pressure and flows into the pressurized oil tank. After the lubricating oil is supplied from the metering oil supply pump to the site dome via the metering oil supply line, it is dropped from the site dome chamber to the center of the venturi mechanism. And a step of mixing the dripping oil with compressed air flowing through a venturi mechanism to atomize the oil, and when spraying into a pressurized oil tank, an oil mist having a relatively large particle size is subjected to an oil mist collision mechanism. Condensed in And the oil mist that passed through the oil mist collision mechanism flows into the oil mist sorting space, and only the large oil mist with large oil droplets is dropped by its own weight while staying in this space. In a fixed-discharge spray lubrication method having a step of storing in a lower part of a pressurized oil tank and a step of discharging fine oil mist from a lubrication device and spraying for lubrication, the oil stored in a lower part of the pressurized oil tank is Using the negative pressure of the Venturi mechanism, a circulation type fixed discharge spray lubrication method that continuously atomizes while forcibly returning from the oil return line opened at the bottom of the pressurized oil tank to the reflux oil inflow chamber of the Venturi mechanism. Exist.

In addition, the other compressed air branched downstream of the air switching valve is supplied to the plunger pump for operating the plunger pump.
After introducing to the port solenoid valve and operating the plunger pump with compressed air by the on / off operation of the 3-port solenoid valve,
A step of sucking up a fixed amount of oil that has been cleaned from an oil tank with an oil filter provided in the oil tank, a step of feeding a fixed amount of oil to the site dome chamber via a fixed amount oil supply line, and a venturi holder for the site dome chamber Separating the lubricating oil dropped on the top dome through the at least one oil passage into the site dome chamber into the reflux oil inflow chamber, and the reflux oil inflow chamber. And a step of joining the oil flowing down to the oil and the reflux oil from the oil reflux line.

On the other hand, a circulation type constant discharge spray circulation device for carrying out this method comprises an air switching valve having at least two ports for turning on / off compressed air after filtration and / or pressure adjustment, and the air switching valve. An oil mist generating device disposed on one branch of the air switching valve, and a fixed amount oil supply pump disposed on the other branch of the air switching valve. An oil drip monitoring site dome attached to the upper part of the pressurized oil tank, a venturi mechanism attached to the lower part of the site dome, and oil for returning the oil accumulated at the bottom of the pressurized oil tank to the venturi mechanism again. A reflux line may be provided.

The venturi mechanism includes a venturi holder having at least one or more oil passages communicating with the site dome chamber, a return oil inflow chamber formed in the venturi holder to communicate with the oil passages, It is preferable to comprise a venturi main body assembled below the return oil inflow chamber and a venturi upper passage connecting the return oil inflow chamber and the oil return line.

Further, the fixed-quantity oil supply pump comprises a plunger pump connected to an oil tank and a three-port solenoid valve connected to an air switching valve.
Activate the plunger pump with the compressed air from the OFF operation, suck up a fixed amount of oil that has been cleaned by the oil filter provided in the oil tank from the oil tank, and supply a fixed amount of oil to the sight dome via the fixed oil supply line. Preferably, a level switch and / or an oil discharge valve mechanism is attached to the pressurized oil tank.

The circulation type constant discharge spray lubrication method and the fixed discharge spray lubrication device of the present invention configured as described above utilize the negative pressure generated by the compressed air flowing in the Venturi main body, and use the negative pressure of the pressurized oil tank. Atomization is continuously performed by sucking oil stored in the bottom (hereinafter simply referred to as stored oil) in the oil return line, returning it to the return oil inflow chamber, and passing it through the center of the Venturi body again. Therefore, as long as the stored oil is in the pressurized oil tank, the oil mist is continuously supplied.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a circulation type constant discharge spray lubrication method according to the present invention will be described. First, the downstream side of an air switching valve having at least two ports for supplying compressed air after filtration and / or pressure adjustment is branched into two, and one of them is supplied to a venturi mechanism and the other is supplied to a fixed amount oil supply pump. I do.

Specifically, as shown in FIGS. 1 and 2,
The compressed air from the air source is passed through the filter / regulator 1 to filter and adjust the pressure of the air, and then branch off to two passages 3 and 4 from an air switching valve 2 such as a 2-port solenoid valve. Is good.

Further, the filter / regulator 1 performs filtration supply of air and pressure adjustment, and it is needless to say that clean pressure air supplied from the import is adjusted to an appropriate pressure (MPa). Absent.

Next, the compressed air is passed through the venturi mechanism to make the site dome chamber a negative pressure and flow into the pressurized oil tank. Specifically, the one passage 3 is directly communicated with the venturi mechanism 5 of the atomizing device, and the passage 3
By passing the compressed air supplied from the Venturi main body 5c on a narrow path to be described later, the air flow rate is increased, and as a result, the inside of the site dome chamber 6a is made to have a negative pressure.

Next, the lubricating oil is supplied to the site dome via a fixed amount oil supply pump and a fixed amount oil supply line, and then dropped from the site dome chamber to the center of the venturi mechanism. In other words, the lubricating oil (oil) 10 in the oil tank 9 is
It is preferable to supply the liquid to the sight dome 6 from the constant-quantity oil supply pump 12 via the constant-quantity oil supply line 13 and to drop the liquid from the top of the sight dome 6 to the center of the venturi body 5c.

As the fixed-quantity oil supply pump, for example, a plunger pump operated by compressed air by turning on / off a three-port solenoid valve can be mentioned.

When the plunger pump 12a is operated, only the purified oil 10 is pumped up through the oil filter 11 provided in the oil tank 9 to the fixed amount from the oil tank. It is preferable to systematize the system so that it can be supplied to the sight dome 6 via the oil supply pump 12 and the fixed amount oil supply line 13.

Next, the oil dropped into the site dome chamber is mixed with the compressed air flowing through the Venturi mechanism to be transformed into an oil mist. It is important to efficiently mix the compressed air flowing through the venturi main body 5c with the compressed air, and it is preferable to spray the oil mist directly into the pressurized oil tank 8.

Next, when sprayed into the pressurized oil tank, an oil mist having a relatively large particle size is condensed by the oil mist collision mechanism and dropped at the lower part of the pressurized oil tank. Specifically, the oil mist having a relatively large particle diameter is preferably condensed by an oil mist collision mechanism 7 formed below the venturi mechanism 5 and then dropped onto the lower part of the pressurized oil tank 8.

Next, the oil mist that has passed through the oil mist collision mechanism flows into the oil mist sorting space, and only the large oil mist having large oil droplets is dropped by its own weight while staying in this space, so that the oil mist falls to the lower part of the pressurized oil tank. Let it be stored. Specifically, the oil mist that has passed through the oil mist collision mechanism 7 is caused to flow down to the oil mist sorting space 8a. It is good to store at the bottom.

Next, the oil stored in the lower part of the pressurized oil tank is forced into the reflux oil inflow chamber of the Venturi mechanism from the oil return line opened at the bottom of the pressurized oil tank using the negative pressure of the Venturi mechanism. Atomizes continuously while returning to normal.

For example, oil 10a stored in the lower part of the pressurized oil tank 8 is subjected to an oil recirculation line opened toward the bottom of the pressurized oil tank 8 by negative pressure generated by compressed air flowing through the venturi mechanism 5. 15, metering orifice 16,
It is good to suck up in order of the venturi upper passage 5d (reflux oil).

The orifice 16 has an orifice size corresponding to the suction capacity of the venturi 5, but is not limited to this orifice (small hole) but may be a tube having a small inner diameter.

Then, the recirculated oil is forcibly returned to the recirculated oil inflow chamber 5b through the venturi upper passage 5d, and passes through the center of the venturi body 5c again, thereby continuously atomizing without waste. Good (see FIG. 2).

The site dome chamber 6a is separated from the reflux oil inflow chamber 5b by the top surface (top cover) of the venturi holder 5a, and a plurality of oil passages 5a ₁ , 5a ₁ are provided on the top surface.
Lubricating oil dropped on site dome chamber 6a flows down to the reflux oil inflow chamber 5b through such oil passage 5a _1, 5a _1, the inflow merges with the reflux oil to the venturi body 5c, is atomized.

As a result, the lubricating oil supplied from the fixed oil supply line 13 is atomized 100% regardless of the operating conditions of the spray lubricating apparatus B or the atomization rate specific to the oil, and is discharged to the secondary side. It is done.

Therefore, as long as the venturi mechanism 5 is operating normally, the amount of lubricating oil fed to the lubrication target per unit time (absolute amount of oil discharge amount) is Will be equal to

It is needless to say that whether or not the operation of the constant-quantity oil supply pump 12 is normal can be easily monitored by a conventional means such as a sensor (optical sensor) for an oil drop dripping in the site dome 6. Absent.

Further, the oil passages 5a ₁ , 5a ₁ are inclined such that the lower ends thereof are directed toward the center of the venturi main body 5c, so that the lubricating oil dripping into the site dome chamber 6a is supplied to the oil passages 5a ₁ , 5a _1. And flows down to the reflux oil inflow chamber 5b through the venturi body 5c so as to efficiently merge with the reflux oil.
You will be guided to the center.

The lubricating oil once supplied into the sight dome 6 via the fixed oil supply line 13 is supplied to the circulation passage (oil return line 15, metering orifice 1) as described above.
6, atomization is continuously performed by the venturi upper passage 5d) (as long as there is oil to be sucked into the pressurized oil tank 8).

Next, only the fine oil mist is discharged from the lubricating device and sprayed for lubrication purposes. In the oil mist sorting space 8a, only the fine oil mist is discharged from the fine oil mist discharge port 14a of the lubricating device by an air flow and supplied for lubrication.

According to the method of the present invention thus configured, the oil stored in the bottom of the pressurized oil tank 8 is returned to the oil return line by utilizing the negative pressure generated by the compressed air flowing through the venturi body 5c. At 15, the atomization is continuously performed by the recirculation method in which the water is forcibly sucked up, returned to the reflux oil inflow chamber 5 b, and again passed through the center of the venturi body 5 c,
As long as there is stored oil in the pressurized oil tank, the oil mist can be continuously supplied, and the stable mist is not affected at all by the type of lubricating oil and the operating conditions of the spray lubrication device as in the conventional method. Conversion rate can be obtained.

In addition, a decrease in the suction capacity or atomization capacity of the venturi mechanism 5 can be detected at an early stage. This is because when the negative pressure generation capability (suction capability) and / or atomization capability of the venturi mechanism 5 decreases, oil starts to accumulate at the bottom of the pressurized oil tank 8.

Incidentally, the pressurized oil tank 8 is made of a transparent material or an oil level detecting level switch 18 is provided at the bottom to easily visually check or detect the degree of accumulation of the lubricating oil, and to detect the deterioration of the capacity of the venturi mechanism 5. be able to.

Next, an embodiment of a circulation type constant discharge spray lubrication apparatus according to the present invention will be described with reference to FIGS. To facilitate understanding, the same parts as those in the above-described conventional example and the method of the present invention are denoted by the same reference numerals, and only the parts having different configurations will be described with new numbers.

In the figure, reference numeral A denotes a circulation type constant discharge spray lubricating apparatus according to the present invention.
As shown in FIG. 1, a filter / regulator 1 for filtering and adjusting the pressure of air, an air switching valve 2 such as a two-port solenoid valve for turning on / off compressed air, and one side of the air switching valve 2 An oil mist generator B is provided in communication with the passage 3, and a fixed oil supply pump 12 is provided in the passage 4 on the other side of the air switching valve 2.

As described above, the filter / regulator 1 performs filtration and supply of air and adjusts pressure. The filter / regulator 1 appropriately removes clean pressure air supplied from the importer into a pressure (MP).
The pressure is adjusted to a).

The oil mist generator B includes an oil drop monitoring site dome 6 mounted above the pressurized oil tank 8 and a venturi mechanism 5 mounted below the site dome 6.
And a level switch 18 attached to the bottom of the pressurized oil tank 8, and an oil return line 15 for returning the oil accumulated at the bottom of the pressurized oil tank 8 to the venturi mechanism 5 again.

As shown in FIG. 2, the venturi mechanism 5 includes a venturi holder 5a having at least one or more oil passages 5a ₁ and 5a ₁ communicating with the site dome chamber 6a. 5a _1, 5a and refluxed oil inflow chamber 5b that order formed in the venturi holder 5a through ₁ duplicate, and venturi body 5c assembled to lower the reflux oil inflow chamber 5b, the return oil inflow chamber 5b and oil A venturi upper passage 5d for communicating with the return line 15 is provided.

Further, the fixed quantity oil supply pump 12 comprises a plunger pump 12a connected to the oil tank 9 and a three-port solenoid valve 12b connected to the air switching valve 2.
The plunger pump 12a is operated by the compressed air by the on / off operation of the port solenoid valve 12b to suck up a fixed amount of the purified oil 10 from the oil tank 9 through the oil filter 11, and then to the site dome 6 through the fixed oil supply line 13. A certain amount of oil is supplied to

Further, the pressurized oil tank 8 is provided with a level switch 18 and an oil discharge valve mechanism 20 so that the degree of accumulation of lubricating oil can be easily detected, and a decrease in the capacity of the venturi mechanism 5 can be detected. can do.

Further, a part of the compressed air supplied to the venturi mechanism 5 is branched and the air bypass adjusting needle 19
When the lubrication target is cooled and the lubrication target is housed in the housing, the compressed air flow rate is adjusted after adjusting the compressed air flow rate in order to prevent contamination, cutting fluid, cooling water, etc. from entering. 14 is mixed.

The circulation type constant discharge spray lubrication apparatus A of the present invention is not limited to the present embodiment, but can be freely designed and changed within the scope of the present invention. Is included.

For example, the oil that has not been turned into a fine oil mist accumulates at the bottom of the pressurized oil tank 8 and is forcibly circulated and atomized in the oil recirculation line 15. Since the oil is supplied at a set frequency, when the oil that exceeds the atomization capability of the venturi mechanism 5 is supplied, for example, when oil that does not atomize by the venturi mechanism 5 is used, and / or when the mist of the venturi mechanism 5 is used. For example, when the oil-forming capacity is reduced, the oil increases into the pressurized oil tank 8 (this means that the initial lubrication condition is not satisfied), and therefore, it is necessary to issue an alarm.

More specifically, when the oil volume exceeds a certain level, the pressurized oil tank 8 is made transparent to monitor the accumulation of a certain amount of oil, and a warning level is set in the transparent pressurized oil tank 8. By printing (MAX.OIL LEVEL), the judgment conditions can be set, and by installing the level switch 18 in the pressurized oil tank 8 as described above, it is possible to output as an alarm to the outside. it can.

When an alarm is output, the cause is investigated and countermeasures are taken. However, it is necessary to discharge the oil accumulated in the pressurized oil tank 8 to the outside. In this case, the oil discharge valve mechanism is required. Needless to say, the problem can be solved by providing the (valve mechanism) 20.

Since the oil supplied from the oil metering discharge pump 12 is dropped in the site dome chamber 6a before being merged with the oil return line 15 (in a state in which only oil is not mixed with air), By installing a drop detection sensor (not shown) on the dome 6, the operation of the oil fixed amount discharge pump 12 may be confirmed.

[0063]

According to the present invention, as described above, the oil stored in the bottom of the pressurized oil tank is forced by the oil return line by utilizing the negative pressure generated by the compressed air flowing through the venturi. By returning to the reflux oil inflow chamber and returning to the return oil inflow chamber, again, by the reflux method of passing through the center of the venturi, as long as the stored oil is in the pressurized oil tank by continuous atomization,
This provides an excellent effect that oil mist can be continuously supplied.

In particular, the oil recirculation line flows in a state where oil and air are mixed in a normal use, so that it is difficult to detect dripping. In order to circulate and use the oil accumulated in the pressurized oil tank, 100% of the oil once entering the reflux oil inflow chamber through the oil passage
% Atomization and discharge, there is no need to detect the amount of oil flowing into the oil return line, and there is no need for a return pipe to the oil tank, and there is an advantage that only one pump mechanism may be used.

As described above, the circulation type fixed-discharge spray lubrication method and the fixed-discharge spray lubrication apparatus of the present invention provide a circulation passage (oil return line, metering orifice, upper venturi passage).
As a result, as long as there is oil to be sucked up in the pressurized oil tank, atomization is continuously performed and oil mist can be continuously supplied,
The present invention is not affected by the type of lubricating oil to be used, the operating conditions of the spray lubricating device, and the like, and is simple in configuration, suitable for mass production, and can be provided to consumers as a low-priced product. Implementing is of tremendous value.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a circulation type constant discharge spray lubrication device according to the present invention.

FIG. 2 is an enlarged view showing a venturi mechanism portion of the circulation type constant discharge spray lubrication apparatus.

FIG. 3 is an explanatory view showing a conventional selective spray lubrication device.

FIG. 4 is a longitudinal sectional view showing a conventional spray generator.

FIG. 5 is an explanatory view showing a conventional fixed-discharge spray lubrication device.

FIG. 6 is an explanatory view showing a conventional fixed-discharge spray lubrication device.

FIG. 7 is a table showing the average particle size and the atomization rate of lubricating oil.

[Explanation of symbols]

Reference Signs List A circulation-type fixed-quantity discharge spray lubrication device B oil mist generator 1 filter / regulator 2 2-port solenoid valve 3 passage 4 passage 5 venturi mechanism 5a venturi holder 5a ₁ oil passage 5b return oil inflow chamber 5c venturi main body 5d venturi upper passage 6 site Dome 6a Site dome chamber 7 Oil mist collision mechanism 8 Pressurized oil tank 8a Oil mist sorting space 9 Oil tank 10 Lubricating oil (oil) 10a Stagnant oil 11 Oil filtration filter 12 Metered oil supply pump 12a Plunger pump 12b 3-port solenoid valve 13 Quantitative Oil supply line 14 Oil mist transfer line 14a Fine oil mist discharge port 15 Oil return line 16 Metalling orifice 17 Pipe 18 Level switch 19 Air bypass adjustment needle 20 Oil discharge valve mechanism 21 Pipe 22 Branch terminal 23 Nozzle 24 Spray device 25 Compressed air Inlet 26 Oil drain Pump 27 siphon tube 28 oil mist sensor 28a emission side sensor 28b receiving side sensor 29 control arithmetic unit

Claims (6)

[Claims] 1. A downstream side of an air switching valve having at least two ports for supplying compressed air after filtration and / or pressure adjustment is branched into two, one of which is a venturi mechanism, and the other is a fixed-quantity oil supply pump. Supplying compressed air to the pressurized oil tank while the compressed air passes through the venturi mechanism, and setting the site dome chamber to a negative pressure and flowing into the pressurized oil tank. After being supplied to the dome, a step of dripping from the site dome chamber to the center of the Venturi mechanism, a step of mixing such dripping oil with compressed air flowing through the Venturi mechanism to atomize the oil, and spraying into the pressurized oil tank The oil mist with a relatively large particle diameter is condensed by the oil mist impingement mechanism and drops at the lower part of the pressurized oil tank, and the oil mist passing through the oil mist impingement mechanism flows into the oil mist sorting space. In this space A fixed-quantity spray having a process of lowering only the oil mist having a large oil particle by its own weight during storage and storing the oil mist at the lower part of the pressurized oil tank, and a process of discharging a fine oil mist from a lubricating device and spraying for lubrication In the lubrication method, the oil stored in the lower part of the pressurized oil tank is forcibly forced into the reflux oil inflow chamber of the Venturi mechanism from the oil return line opened at the bottom of the pressurized oil tank using the negative pressure of the Venturi mechanism. A circulation type fixed discharge spray lubrication method characterized by continuously atomizing while returning. 2. The compressed air branched on the downstream side of the air switching valve is introduced into a three-port solenoid valve for operating the plunger pump, and the plunger pump is operated with the compressed air by turning on / off the three-port solenoid valve. After that, a step of sucking up a fixed amount of oil purified from an oil tank by an oil filter provided in the oil tank, a step of feeding a fixed amount of oil to a site dome chamber through a fixed amount oil supply line, Separating the chamber from the reflux oil inflow chamber by the top surface of the venturi holder, and causing the lubricating oil dropped into the site dome chamber to flow to the reflux oil inflow chamber through at least one or more oil passages on the top surface, 2. The method of claim 1, further comprising the step of: combining the oil flowing down to the reflux oil inflow chamber with the reflux oil from the oil reflux line. 3. An air switching valve having at least two ports for turning on / off compressed air after filtration and / or pressure adjustment, and
An oil mist generating device disposed on a branch of one side of the air switching valve, and a fixed amount oil supply pump disposed on a branch of the other side of the air switching valve; The equipment is
An oil drop monitoring site dome mounted on the upper side of the pressurized oil tank, a venturi mechanism mounted on the lower side of the site dome, and oil collected at the bottom of the pressurized oil tank is returned to the venturi mechanism again. A circulation type constant discharge spray lubrication device comprising an oil recirculation line. A venturi holder having at least one oil passage communicating with the sight dome chamber; a reflux oil inflow chamber formed in the venturi holder to communicate with the oil passage; The circulation type constant discharge according to claim 3, further comprising: a venturi main body assembled below the reflux oil inflow chamber; and a venturi upper passage for communicating the reflux oil inflow chamber with the oil reflux line. Spray lubrication device. 5. The fixed-quantity oil supply pump includes a plunger pump connected to an oil tank and a three-port solenoid valve connected to an air switching valve. The plunger pump is actuated to suck up a fixed amount of oil, which has been cleaned by an oil filter provided in the oil tank, from the oil tank, and to supply a fixed amount of oil to the site dome via a fixed oil supply line. 4. The circulation type constant discharge spray lubrication device according to 3. 6. A level switch and / or a level switch in the pressurized oil tank.
4. The circulation type constant discharge spray lubrication device according to claim 3, further comprising an oil discharge valve mechanism. 5.