EP2176580A1

EP2176580A1 - Device

Info

Publication number: EP2176580A1
Application number: EP08784832A
Authority: EP
Inventors: Götz SPIESS
Original assignee: SKF AB
Current assignee: SKF AB
Priority date: 2007-07-21
Filing date: 2008-07-17
Publication date: 2010-04-21
Also published as: DE102007034117A1; DE102007034117B4; WO2009012926A1

Abstract

A device for mixing a first, gaseous fluid with a second, liquid fluid comprises a discharge element for the second fluid for discharging the second fluid into a space for mixing the two fluids, wherein the discharge element is formed in such a way that a discharged amount of less than 5000 nl can be discharged in a discharge interval.

Description

contraption

The invention relates to an apparatus for mixing a first gaseous fluid with a second liquid fluid.

For example, from DE 601 07 364 T2 an oil-air lubrication device comprising a mixing valve is known, in which air and oil can be mixed, and oil can be dispensed in an amount of 0.01 to 0.03 ml.

From DD 268 747 A, it is also known to use for lubrication of a number of friction points, in particular of rolling bearings, so-called minimum oil lubrication method. In such methods not infrequently lubricant quantities of less than 30 mm ^{3 are} supplied to the warehouse every ten minutes. Especially when loaded with high and high speeds rolling bearings very small oil supply per unit time are necessary to keep roll-over losses and associated temperature development low. Such a minimal oil lubrication method is sought with the oil-air lubrication, wherein the periodically discharged lubricant drops via a mixing chamber in an air-flow line passes and transported along the pipe wall by means of the air flow in the direction of lubrication point and thereby pulled apart so that arrives at the lubrication point over a longer period of time period of an almost continuous flow of lubricant. The cable length to the lubrication point should be about 50 cm for reasons of uniformity mentioned.

Furthermore, cable lengths of at least 1 m, typically 1 to 4 m and in some cases also up to 20 m are required for the previously mentioned oil-air lubrication.

An object of the invention is to provide an improved apparatus for mixing a first gaseous fluid with a second liquid fluid.

The object is solved by the subject matter of claim 1. Advantageous embodiments are described in the subclaims.

According to claim 1, an apparatus for mixing a first gaseous fluid with a second liquid fluid includes a second fluid dispensing member for dispensing the second fluid into a space for mixing the two fluids, the dispensing member being configured to provide a dispensing interval Output quantity smaller 5000 nl can be output.

The invention is based on the recognition that, for example, in the sense of optimal minimum lubrication, a reduction of the dosing volumes of the liquid acting as a lubricant fluid towards very small volumes within a mixing valve is quite beneficial. A particular advantage of the small metered quantities is that, to the extent that the metered individual volumes are reduced, the supply of the fluid mixture at the point to be lubricated is advantageously evened out.

For the corresponding embodiment of the dispensing element, according to an advantageous embodiment, the dispensing element comprises a microdosing valve. In this case, microdosing valves, for example by means of piezo drive, are known, in which dosing quantities between 100 and down to 2 nl per cycle can be output. In particular, the formation of the dispensing element with a micro-metering valve is particularly advantageous because other solutions, for example based on micro-toothed ring pumps, require comparatively high costs for micro-toothed ring pumps, and still have too high a metering volume and the need for this a suspension operation, possibly in conjunction with inaccurate bypass systems results.

According to an advantageous embodiment, the device comprises a pressure supply element for providing a pressure on an input side of the dispensing element or the micro-metering valve, wherein the pressure-providing element comprises in particular a pressure booster, which is in particular connected to a compressed air system. The particular advantage lies in the fact that the input side pressure generation in the output element by connection to a compressed air system is possible, which is standard in most product manufacturing facilities.

In a further advantageous embodiment, the second fluid, for example an oil, is increased from an opposite to the dispensing element. arranged container fed to the input side of the output element. This results in the particular advantage that a pump unit for generating pressure in the system of the second fluid can be saved. Of course, in special applications, such a pressure generating system can still be provided.

In a further advantageous embodiment, the output element is connected to a control that generates corresponding Öffhungsimpulse for the output element. In the case of a micro-metering valve, the control element has drivers which can directly control the micro-metering valve. On the input side, the control is equipped with at least one industry standard interface, such as a 24 V DC interface, a RS232 and / or a corresponding bus connection.

Further advantages, features and details will become apparent from the embodiment of the invention described below with reference to FIG.

The figure shows an exemplary embodiment of the invention in the form of a

Schematic diagram of an apparatus for mixing a first gaseous fluid, in particular air, with a second liquid fluid, in particular an oil for lubricating a lubrication point, such as a rolling bearing, serving. The device further comprises a micro-metering valve 12 with the smallest particular amounts of oil, for example, 100 nl down to 2 nl per cycle in a chamber, not shown, for injecting the oil are injectable with air, wherein the air of the chamber supplied in particular as compressed air 40 of the chamber is. The opening times of the Mikrodosierventils 12th determine the metered oil volume. At the output of the device so that an oil-air mixture 50, for example, in the sense of the initially described in DD 268 747 A oil-air lubrication can be output, which is supplied via a corresponding line of the point to be lubricated, for example said rolling bearing.

For a corresponding control and generation of Öffhungsimpulse for the Mikrodosierventil 12, the Mikrodosierventil 12 is connected to a control element 20 which has to Mikrodosierventil 12 through drivers with which the Mikrodosierventil 12 is directly controlled and the input side has at least one industry standard interface.

For providing a necessary pressure for the micro-metering valve 12 at an input side of the micro-metering valve 12, the device comprises an integrated pressure-translator 18 which is connected to the compressed air 40. Furthermore, the oil from a relative to the micro-metering valve 12 is arranged increased fall oil tank 30 is fed to the micro-metering valve 12.

In one design, the device is supplemented by an integrated temperature sensor and compensation electronics. With changing ambient temperature and thus changing viscosity of the lubricant, the new opening time is calculated in knowledge of the temperature dependence of the relationship between the opening time of the micro-metering valve 12 and the metered volume, thus compensating for the temperature influence on the metered volume. In a further embodiment, the device is supplemented by a temperature control loop, so that the dosage is independent of temperature.

Claims

P atentanspr ch ch device

An apparatus for mixing a first gaseous fluid with a second liquid fluid, comprising a second fluid dispensing element for dispensing the second fluid into a space used to mix the two fluids, the dispensing element being configured such that in an dispensing interval an output smaller

5000 nl can be output.

2. Device according to claim 1, wherein the output element is designed to output a precisely metered amount of less than 100 nl.

3. Device according to one of claims 1 or 2, wherein the output element is designed to output a precisely metered amount down to 2 nl.

4. Device according to one of claims 1 to 3, wherein the output element for dispensing a lubricant, in particular an oil is formed.

5. Device according to one of claims 1 to 4, wherein the first fluid comprises air, in particular compressed air.

6. Device according to one of claims 1 to 5, wherein the output element comprises a micro-metering valve.

The apparatus of any one of claims 1 to 6, wherein the apparatus comprises a pressure providing element for providing a pressure to the dispensing element.

8. The apparatus of claim 7, wherein the pressure providing element is connected to an input side of the output member.

9. Device according to one of claims 7 or 8, wherein the Druckbereit- position element comprises a pressure booster.

10. Device according to one of claims 7 to 9, wherein the pressure-providing element is designed for a compressed air connection.

11. Device according to one of claims 1 to 10, wherein the second fluid is supplied to the output element from a relative to the dispensing element raised container arranged.

12. Device according to one of claims 1 to 11, wherein the device comprises a control element for driving the output element and the

Control and the output element are interconnected.

13. Device according to one of claims 1 to 12, wherein the device comprises at least one temperature detecting means.

14. The apparatus of claim 13, wherein the control element is connected to the temperature detecting means and is designed such that, when the temperature changes, an opening time of the dispensing element is calculated such that the influence of temperature on the metered dispensing amount is compensated.

15. Device according to one of claims 13 or 14, wherein the control element is connected to the temperature detection means and is designed such that in the sense of a temperature control loop, the dosage of the output quantity is temperature independent.