JPH0364673A - Apparatus for conducting degassing and priming of pump - Google Patents

Abstract

PURPOSE: To certainly carry out degassing and priming of a pump by piping and connecting a receptacle on which an orifice to open to atmospheric air is provided to the top point of a suction chamber to be connected to a suction opening of the pump. CONSTITUTION: A receptacle 3 having an orifice s to open to atmospheric air on its upper part and having a means constituted by storing a ball 9 in a guide element 10 free to float so as to prevent escape of liquid through the orifice 8 is connected to the top point of a suction chamber 2 through a second pipe 5. The suction chamber 2 is connected to a tank 1 through a first pipe 6 in which a filter 11 is interposed, connected to a suction opening of a pump 4 and a second hydraulic pressure circuit 7 is connected to a discharge port of the pump 4. Consequently, it is possible to certainly carry out degassing and priming of the pump 4 through the receptacle 3.

Description

[Detailed description of the invention] Concerning equipment for carrying out.

In pressurized fluid systems, which are frequently found in automobiles due to the increasing number of brake control booster devices, pressure accumulators are provided to store a buffer pressure to limit the period of operation of the pump. This accumulator usually has a diaphragm separating the pressurized gas from the brake fluid. Despite the attention and improvements that have been made to membrane design, membranes have been found to be moderately permeable to gas. However, such a release of gas into the liquid can be reduced to a negligible value by installing a bleed device that allows the accumulator to be emptied when the vehicle equipped with the accumulator is not in operation. However, this emptying action carries the gas retained in the liquid of the accumulator to the suction chamber of the pump, where the gas accumulates. As a result, venting gas from the suction chamber of the pump is absolutely necessary to ensure effective priming of the pump.

SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can degas a pump and reliably perform effective priming.

To achieve this purpose, a device for degassing and priming the pump is connected via a first pipe to the suction chamber of the pump, which contains liquid at low pressure and pumps liquid at high pressure into a second liquid circuit. The first fluid circuit is disposed in a first liquid circuit with a tank containing a liquid.

According to the invention, the device comprises a receptacle provided with an orifice opening to atmospheric pressure, connected to said receptacle and allowing flow of low pressure liquid between said tank and said receptacle via said suction chamber. and a second pipe connected to the suction chamber. Preferably, the tank and receptacle are a single element.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The device shown in FIG. 1 contains a liquid at low pressure and
It has a receptacle 3 having an orifice 8 at the top that opens to atmospheric pressure. In the illustrated example, means are provided inside the receptacle 3 to prevent the escape of liquid through the orifice 8 . Preferably, this means includes orifice 8
A ball 9 that is arranged along the axis of the liquid and can float in the liquid.
Consists of. The axial trajectory of the ball 9 is maintained by a guiding element 10. The ball 9 has a diameter such that it seals the orifice 8 at maximum stroke and prevents liquid from escaping.

The first hydraulic circuit includes a tank 1 that contains a low-pressure liquid and communicates with the suction chamber 2 via a first pipe 6 .

The receptacle 3 is connected to the highest point of the suction chamber 2 via a second pipe 5. In this way, a flow of low-pressure liquid takes place between the tank 1 and the receptacle 3 via the suction chamber 2. A filter 11 is arranged between the tank 1 and the suction chamber 2. This filter removes impurities contained in the low-pressure liquid, but is not completely permeable to gases.

The second hydraulic circuit 7 includes a diaphragm pressure accumulator that maintains the liquid pressure in this circuit when the pump is not operating, and a bleed device that limits the diffusion of gas into the liquid by emptying the accumulator. It is equipped with Since this second hydraulic pressure circuit is irrelevant to obtaining the unique functions of the device of the present invention, a detailed explanation thereof will be omitted.

The apparatus shown in FIG. 1 operates in the following manner. When the pump 4 enters a period of inactivity, the diaphragm becomes slack due to the constant leakage of liquid so as to reduce the contact between the diaphragm and the liquid to a small area.

The remaining gas moves to the first hydraulic circuit. Gas is in suction chamber 2
Rather than pooling within, it naturally flows in the direction of the receptacle 3 through the flow path defined by the second tube 5 and eventually escapes through the orifice 8.

In the embodiment shown in FIG. 2, the receptacle is simply part of the tank, and the second tube 5 establishes the flow of liquid between the tank 1 and the highest point of the suction chamber 2. In this case,
A filter 12 is arranged between this highest point and the tank 1 to remove impurities from the liquid when the pump is drawing low pressure liquid from the tank. The operation in this example is as follows:
The phase of movement of gas toward the first branch pressure circuit is similar to that shown in FIG. 1. Thereafter, in this embodiment, the gas will naturally move through the second tube 5 in the direction of the filter 12, which will slow down the escape of the gas. However, the liquid contained in the first tube 6 displaces the gas through the filter 12 in the direction of the tank 1 when the pump 4 enters the operating cycle again, ensuring effective priming of the pump. They work as they should.

Numerous modifications to the device of the invention will be apparent to those skilled in the art. For example, the receptacle can be in the form of a tube with one end exposed to atmospheric pressure.

Furthermore, the tube can be provided with means for preventing the escape of liquid.

Although the present invention has been described with respect to a fluid circuit used in an automobile, the invention is applicable to any hydraulic system that includes a low pressure fluid circuit and a pressurized fluid circuit.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing one embodiment of the device according to the present invention, and FIG. 2 is a schematic diagram showing another embodiment of the device according to the present invention. 1. Tank, 2. Suction chamber, 3. Receptacle, 4
... Pump, 5.. Second pipe, 6.. First pipe, 7.. Second pipe.
Hydraulic pressure circuit, 8...orifice, 9...ball, 10...
Guide element, 11.12...filter.

Claims (1)

[Claims] 1 Contains low-pressure liquid and also includes a second liquid circuit (7
) The suction chamber (2) of the pump (4) that pumps high-pressure liquid to
In a device for degassing and priming a pump, which is disposed in a first liquid circuit comprising a tank (1) connected via a first pipe (6) to a receptacle (3) provided with an orifice (8);
connected to the receptacle and connected to the suction chamber (
2) a second pipe (5) connected to the suction chamber (2) to allow flow of low-pressure liquid between the tank and the receptacle (3) via the suction chamber (2); , a device for degassing and priming the pump. 2. Device according to claim 1, characterized in that the receptacle (3) is substantially in the form of a tube open at one end. 3. Device according to claim 1, characterized in that the receptacle (3) is integrated into the tank (1) so as to constitute only a tank. 4. Device according to claim 1 or 2, characterized in that the receptacle (3) is provided with means for preventing the escape of liquid. 5. A device according to claim 4, characterized in that said means consist of a floatable ball (9) inserted between the low-pressure liquid and said orifice and kept sliding by a guiding element (10). Device.