FR2466274A1 - Automatic prepn. of mixt. of soluble oil and water for lubrication - by installation giving precise dosing and homogeneous mixing - Google Patents

Abstract

Appts. for the automatic mixing of soluble oil and water comprises a mixing vessel into the bottom of which opens a pipe connected to a pump discharging the mixt. of instruments to be lubricated. The vessel includes a gauge capable of detecting a min. level and a max. level and is fitted with an agitator, and a water feed pipe and an oil feed pipe opening to the top of the vessel. A volumetric counter and an electrically operated valve are mounted in the water feed pipe. A dosing pump is mounted in the oil feed pipe. There are means of control arranged so that when the mixt. reaches the min. level, the electrically operated valve lets water into the vessel. The volumetric counter supplies information after each passage of a fixed vol. of water. Information initiates the operation of the dosing pump during a predetermined time. When the level in the vessel reaches the max., the electrically operated valve cuts off the water feed. The agitator is pref. controlled so that it starts to operate at the same time as the dosing pump and stops after it. Appts . gives precise dosing and homogeneous mixing.

Description

 The present invention relates to an automatic mixing plant soluble oil and water.

 It is sometimes advisable to make a mixture of soluble oil and water for the lubrication of certain organs such as the scissors used in glassware. The dosage of oil in water can vary depending on the case between 0.3 and 5%. It is important to respect p, lusieurs imperatives and in particular a precise dosage, a good homogeneity of the mixture, and to realize this as and when use.

 Precise dosing should be carried out for economic reasons in order to avoid unnecessary oil expenditure, to limit pollution of waste water, and clogging of scissors or other tools to be lubricated.

 The homogeneity of the mixture must be good so that it best fulfills its function. Finally, the mixture cannot be prepared well in advance because of the degradation which it undergoes fairly quickly.

 At present, no device allows these three functions to be fulfilled simultaneously.

 The present invention aims to remedy these drawbacks.

To this end, the device which it concerns comprises a tank for mixing oil and water in the bottom of which opens a tube on which is mounted a pump delivering the mixture to the instruments to be lubricated, the tank comprising a gauge capable of detecting at least a minimum level and a maximum level and being equipped with an agitator, a water supply pipe on which are mounted at least a volumetric meter and a solenoid valve, and an oil supply pipe from a reserve of oil on which is mounted a metering pump, opening at the upper part of the tank, control means being provided which are arranged in such a way that, when the mixture reaches the minimum level, the solenoid valve allows the supply of water in the tank, the meter supplying information after each passage of a determined volume of water causing the metering pump to operate for a predetermined time and that, when the level in the tank reaches the level m aximal, 1 solenoid valve cuts off the water supply.

In addition to the aforementioned members, a filter and a manually actuated inlet valve are advantageously mounted on the water supply pipe. The mixture is withdrawn permanently from the lower part of the tank, in order to be directed towards the device to be lubricated. When the level in the tank reaches the predetermined minimum, it is filled with water and soluble oil as described above. It should be noted that during the filling phase, the drawing off of the mixture is not interrupted.

 Since the difference between the minimum and maximum levels corresponds to a volume of 60 liters, the device can be adjusted so that the water meter provides a pulse causing the dosing pump to operate, each time 10 liters of water have passed. The metering of oil is carried out very precisely by knowing the volume supplied by a stroke of the pump by causing, each time the pump is started, the achievement of a predetermined number of cycles thereof and, consequently, , knowing its operating frequency, by adjusting the operating time following each introduction into the tank of a determined volume of water.

 According to another characteristic of the invention, the control means of the agitator are such that the latter enters into operation at the same time as the metering pump and stops after it. This ensures good homogenization of the mixture since the agitation time is greater than the operating time of the oil metering pump.

 In any case, the invention will be clearly understood with the aid of the description which follows with reference to the single figure of the appended schematic drawing representing the main constituent bodies of this device.

 This device comprises a tank 2 for mixing oil and water, at the bottom of which opens a tube 3 onto which is mounted a pump 4 intended to deliver the mixture to the members to be lubricated. Inside the tank is placed an agitator 5 driven in rotation by an electric motor 6. This tank is also equipped with a gauge 7 capable of detecting at least a predetermined minimum level 8 and a maximum level 9. At the upper part of the tank 2 there opens a water supply pipe 10 onto which an inlet valve 12, a filter 13, a volumetric counter 14 with pulses and a solenoid valve 15 are mounted upstream and downstream. upper part of the tank 2 also opens a conduit 16 putting the tank in communication with an oil tank 17, this conduit 16 being equipped with a metering pump 18. There is provided a control cabinet 19 to which the motor 6 are connected , the gauge 7, the water meter 14, the solenoid valve 15 and the metering pump 18.

The regulation is carried out so that, the pump 4 ensuring a continuous withdrawal of mixture in the tank, when the mixture reaches a maximum level 8, the solenoid valve 15 is open ensuring the supply of water to the tank. When the counter 14 has noted the passage of a predetermined volume of water, it provides information to the cabinet 19 which causes the metering pump to start and consequently the oil supply to tank 2 for a time. predetermined. Each time the water meter 14 records the passage of a predetermined volume, it causes the metering pump to start.

 When the mixture reaches the maximum level 9, the information given to the regulation device causes the solenoid valve 15 to close. It should be noted that each start-up of the metering pump 18 is accompanied by the start-up of the engine. 6 of the agitator 5, the timing device ensuring the agitation being adjusted so that the agitation time is greater than the operating time of the metering pump.

As is apparent from the above, the invention brings a great improvement to the existing technique by providing a device of simple design making it possible to ensure continuous lubrication using a mixture of oil and water with discontinuous preparation of the mixture when necessary, under a precise dosage and with excellent homogeneity.

 It goes without saying that the invention is not limited to the sole embodiment of this device, described above by way of example; on the contrary, it embraces all of its variant embodiments.

Claims (2)

- CLAIMS 1. - Automatic mixing plant for soluble oil and water, characterized in that it comprises an oil and water mixing tank at the bottom of which opens a tube on which is mounted a pump delivering the mixture to the instruments lubricate, the tank comprising a gauge capable of detecting at least a minimum level and a maximum level and being equipped with an agitator, a water supply pipe on which are mounted at least a volumetric meter and a solenoid valve, and a oil supply pipe from an oil reserve on which a metering pump is mounted, opening at the upper part of the tank, control means being provided which are arranged so that, when the mixture reaches the minimum level , the solenoid valve allows water to be brought into the tank, the meter providing, after each passage of a determined volume of water, information causing the metering pump to operate for a predetermined time and that, when when the level in the tank reaches the maximum level, the solenoid valve cuts off the water supply. 2. - A plant according to claim 1, characterized in that the agitator control means are such that it enters into operation at the same time as the metering pump and stops after it.