FR2865464A1 - Tank vehicle e.g. milk pick-up truck, has unit creating depression in tank and air compressor circuit, and ejector including one pipe communicating with interior of tank and another pipe communicating with compressor circuit - Google Patents

Abstract

The vehicle has a unit for creating a depression in a tank (2) and an air compressor circuit (8). An ejector (6) includes a pipe (3) for communicating with the interior of the tank and a pipe (7) for communicating with the air compressor circuit. A pressure sensor (4) mounted on the pipe (3) controls the level of depression inside the tank. A check valve (5) prevents air from entering inside of the tank.

Description

Ejector tanker

  The present invention relates to tank vehicles which comprise means for creating a vacuum in the tank.

  Thanks to this depression, the tank can be filled automatically from a tank or can. The invention is particularly applicable to milk collection trucks.

  It is already known to create the vacuum in the tank using the vacuum in the intake manifold to the engine instead of mounting a vacuum pump with all the equipment that accompanies it. But, in the event of a malfunction, milk can reach the motor.

  The invention overcomes these disadvantages by a tanker vehicle not implementing a rotating part, not connecting to the intake manifold of the engine with the dangers that this entails, not disturbing the engine operating electronics. , requiring little investment, low noise and very safe, the additional equipment of the base vehicle being integrally attached to the tank regardless of the type of vehicle and can be mounted with the tank on another vehicle.

  The tanker vehicle according to the invention comprising means for creating a vacuum in the tank and a compressed air circuit, is characterized in that the means comprise an ejector which a conduit for the fluid to be displaced communicates with the inside of the tank. the tank and a conduit for the engine fluid communicates with the compressed air circuit of the vehicle.

  The vacuum in the tank is now obtained by using the compressed air circuit of the vehicle such as the circuit which serves for a lift axle or for the suspension, in a completely independent manner of the engine. It can no longer be endangered in case of malfunction. The compressed air coming from the air circuit feeding the servitudes of the truck passes into the ejector. This sucks the air into the tank causing a depression in it.

  Preferably, this depression is controlled by a vacuum sensor inside the tank and by means controlled by the sensor which cuts the supply of the ejector compressed air as soon as a given depression is reached. Preferably, the sensor is mounted on the conduit for the displaced fluid. As soon as the given depression is reached, preferably a non-return valve, preventing the passage of air from the outside to the inside of the tank and mounted on the conduit for the fluid to be displaced, goes into action and closes this duct, which keeps the vacuum level inside the tank.

  The single figure of the appended drawing is a partial schematic view of a tanker truck according to the invention.

  The truck designated as a whole by reference 1 comprises a tank 2 which is only partly shown in the figure and which has an inlet duct to which can be connected a flexible duct terminated by a suction cane which can penetrate into a tank. milk can on the side of the road. The tank 2 has an upper opening in which opens a conduit 3 for the fluid to be displaced in this case the air in the tank. On this duct 3 are successively mounted from the tank 2 a pressure sensor 4, a non-return valve and an ejector 6, the conduit 7 for the engine fluid communicates with the air circuit 8 of the truck. The vacuum sensor is part of a system 9 for monitoring the level of depression inside the tank 2. This system cuts off the supply of compressed air or motor fluid to the ejector 6 as soon as the desired vacuum level is reached in the tank, as is symbolized by the dashed line 10 in the figure.

Claims (4)

  A tanker vehicle comprising means for creating a vacuum in the tank (2) and a compressed air circuit, characterized in that the means comprise an ejector (6) of which a conduit (3) for the fluid to be displaced communicates. with the interior of the tank (2) and a conduit (7) for the driving fluid communicates with a circuit (8) of compressed air of the vehicle.   2. Vehicle according to claim 1, characterized by a sensor (4) of the depression inside the tank (2) and by means controlled by the sensor (4), which cut off the feed of the ejector (6) compressed air as soon as a given depression is reached.   3. Vehicle according to claim 2, characterized in that the sensor (4) is mounted on the conduit (3) for the fluid to be moved.   4. Vehicle according to claim 2 or 3, characterized in that a non-return valve (5) preventing the passage of air from the outside to the inside of the tank (2) mounted on the conduit (3) for the fluid to be moved.