JPS6252098A - Method of filling vessel to be filled of hydraulic mechanismwith liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to hydraulic mechanisms, such as hydraulic brake mechanisms for vehicles,
Φ that has a pump or hydraulic cylinder that uses hydraulic pressure
This invention relates to a method for filling and covering containers such as Okegawa Soft Loading Mechanism, such as various cylinders of vehicles, hydraulic cylinders for the neck of a rift, and the like.

``Prior Art'' Conventionally, when filling a brake circuit that controls a container to be filled in a hydraulic mechanism, such as a master cylinder of a vehicle's hydraulic brake mechanism, with brake fluid, the brake fluid contained in the tank is pumped. A method in which the brake fluid is supplied by force directly to the fluid supply port of the brake circuit using a pump, and at the same time, the brake fluid flows out from the a1 port of the brake circuit, and thus the air existing in the brake circuit is swept away by the brake fluid, or the brake circuit The air in the hydraulic brake mechanism is discharged from the fluid supply port or fluid handling port using a vacuum pump, etc., and after what is called vacuuming, the brake fluid in the tank is pumped directly from either of the ports to the brake circuit. Methods such as supplying liquid by pumping it into the tank have been proposed.

However, although such conventional filling methods do not pose any particular problems when the container is filled under conditions of ``popular pressure'' or higher than atmospheric pressure, it is necessary to reduce the pressure inside the container before filling. In the latter method, dissolved gas in the brake fluid is generated as bubbles from the liquid during filling, and as a result, there are cases where the gas remains as air in the container to be filled. However, at atmospheric pressure, 1 to 2% (volume percentage) of gas is dissolved in any liquid, but in such cases there is no need to worry about handling the liquid at atmospheric pressure or above atmospheric pressure. Although this is not a problem, under conditions such as reduced pressure, high temperature, vibration, and stirring, gas molecules that have entered between liquid molecules become bubbles. In particular, in the hydraulic brake system of a vehicle, even after the brake circuit has been filled with brake fluid by drawing a vacuum, air still remains in the brake circuit due to the A-refrigerator in the hydraulic system and the small curved path. There were cases where it remained. As a result, there was a risk that the function of the hydraulic mechanism would deteriorate.

Therefore, in order to eliminate this drawback, a method was developed to bring the pressure inside the container to be filled as close to an absolute vacuum as possible, or to separate the depressurization route and the filling route as much as possible.
Various methods have been attempted, such as the method proposed in Publication No. 9, in which vacuum is drawn simultaneously from both the starting end of the brake circuit of a hydraulic brake mechanism and the terminal end of the circuit, but these methods have not been successful. However, not only does it take a long time to reduce the pressure, but the vacuum filling apparatus itself becomes large-scale.

``Object of the present invention'' In view of the above-mentioned conventional drawbacks, the present invention aims to prevent air from remaining as much as possible even when the container to be filled in the hydraulic mechanism is filled with liquid, thereby preventing deterioration of the function of the hydraulic mechanism. In addition, it is possible to fill containers with liquid in a short period of time, and it is also possible to continuously supply a large amount of liquid to containers to be filled without the need for a complicated structure such as a vacuum filling device. An object of the present invention is to provide a method for filling a filling container of a hydraulic mechanism capable of discharging liquid with liquid.

``Means for Achieving the Objects of the Invention'' A method of filling a liquid into a container to be filled in a hydraulic mechanism according to the present invention is to apply liquid such as brake fluid pumped by a pressure pump to the inner wall surface of the container in a vacuum state. The dissolved gas in the liquid is released into the atmosphere via a vacuum pump to perform deaeration, and then the deaerated liquid is transferred to the liquid pressure via an automatic vacuum filling device. It is characterized by filling the filling container of the mechanism.

"Embodiments of the present invention" The present invention will be described in detail below with reference to embodiments shown in the drawings.

Figure 1 shows a vehicle hydraulic brake mechanism, a vehicle lift device using a hydraulic cylinder, etc., and a container to be filled next to the hydraulic pressure Ia, for example, in the hydraulic brake diagram, a brake circuit having a master cylinder, etc. In the rifling device mechanism, a schematic process diagram for filling a hydraulic circuit having a hydraulic cylinder with liquid is shown. That is, A
is a step in which brake fluid X contained in a tank 1 is pumped into a degassing container 2 using a pressure pump 3. B is a step in which the liquid pumped by the pressure pump 3 is degassed in the container 2 in a vacuum state. The ejected or injected liquid is once collided with the inner wall 2a of the container 2,
This is done by releasing the gas 5 dissolved in the liquid thus generated into the atmosphere via a vacuum pump 7 that is continuously operated by a motor 6. C is a step of filling the thus degassed brake fluid Y into the filling container 10 of the hydraulic brake mechanism 9, which is an example of a hydraulic mechanism, via the automatic vacuum filling device 8.

Next, FIG. 2 shows an embodiment of a degassing device used in the liquid degassing step B in the embodiment of FIG. 1. That is, 11 is a tank containing fluid X such as brake fluid. Reference numeral 12 denotes a liquid type passage pipe that connects the tank 11 and the degassing container 13, and a pressure pump is installed at an appropriate point in the middle of this liquid type passage pipe 12 for pressure-feeding the liquid X in the tank 11 into the container 13. 14 and an electromagnetic valve 15 for stopping or starting the flow of the liquid. 1G is a nozzle attached to the end of the liquid type passage pipe 12 introduced to the center of the upper part of the container 13. From this nozzle 16, the liquid X in the tank, which is pumped by the pressure pump 14, is sent to the container 1
The liquid is injected toward the inner wall 13a of No. 3 so as to collide with the inner wall. Reference numeral 17 designates air-conducting tubes having one end attached to the top of the container and the other end attached to a vacuum pump 19 which is continuously operated by a motor 18. 20 is an airtight tank 2 whose upper end is at the bottom of the container 13 and whose lower end hermetically stores the deaerated liquid Y.
The liquid handling conduit 20 is equipped with an electromagnetic valve 22 at an appropriate location. This conduit 23 has two electromagnetic valves 24 and 25 installed at a required interval, and the other end is open to the atmosphere.
The setting number is listed. 26 is a conduit whose upper end is attached between the electromagnetic valves 24 and 25 of the conduit 23, and whose other end is attached to the upper part of the closed tank 21. A conduit 27 connects the sealed tank 21 and an automatic vacuum filling device (not shown) via an electromagnetic valve 28. 29
is a detector that is connected to upper and lower float switches SW1 and SW2 provided at predetermined intervals in the container 13 to maintain the liquid level in the container 13 within a desired range and to space the above-mentioned electromagnetic valves. .

However, in a degassing device configured in this way,
[- One vacuum pump is activated by the drive of the motor 18.
While removing the air existing in the container 13 via the air conduit 17, the pressure capon 14 is driven, and the liquid X in the tank 11 is removed.
is force-fed through the liquid conduit 12, and the liquid X is injected from the nozzle 16 so as to continuously collide with the inner wall 13a of the container 13. As a result, dissolved gas 5 which had been dissolved in the liquid is generated, and this dissolved gas 5 is transferred to the air conduit 17 and the vacuum pump 1.
9 and then released into the atmosphere from the exhaust pipe, and the container 13
A liquid Y containing no dissolved gas is obtained. The degassed liquid Y in the container 13 gradually increases to 1 (1) due to the ejection from the nozzle 16, and when the liquid level rises to the point where the upper [ ] - switch SWI is detected, an electromagnetic signal is generated by the electric signal from the detector 29. Valve 1
5 is in an open state, and the nozzle 16 stops ejecting water. To take out the liquid Y from the container 13, the electromagnetic valve 22 of the liquid handling conduit 20 and the electromagnetic valve 24 of the conduit 23 are
are opened from their respective open states, and then both the other electromagnetic valve 25 of the conduit 23 and the electromagnetic pulse 28 of the conduit 27 are opened, so that the liquid Y in the sealed tank 21 passes through the conduit 27 and is automatically vacuum filled. guided to the device. on the other hand,
When the suspension of the liquid Y in the container 13 decreases and the liquid level falls to the level detected by the lower float switch SW2, the electromagnetic valve 15 is opened again by the electric signals from the two detectors, and the pressure is increased from the nozzle 16. The liquid X pumped by the pump 14 is ejected, and the ejection continues until the float switch SW1 is detected as described above.

"Effects of the present invention" (1) The liquid pumped by the pressure caponbu is degassed in advance in a container in a vacuum state, and the degassed liquid is filled into the container to be filled of the hydraulic mechanism. There is almost no residual air (dissolved gas) in the

In addition, air is not generated in the container filled with liquid due to sudden temperature changes, vibrations, etc.

This fact is clear from the results of comparing and examining the amount of dissolved gas generated between the degassed liquid and the final degassed liquid using a certain type of deaerator as shown in the table below.

The amount of dissolved gas generated (10 minutes, etc.) is the elapsed time, and the degassed liquid is the experimental object.
;Continues from the above table.

Therefore, it is possible to fill the container to be filled with liquid Y, which is highly stable against temperature changes, vibrations, etc., making full use of the liquid's original performance and preventing deterioration of the hydraulic mechanism. It never goes away.

(2) Since the liquid in the tank is degassed beforehand and then filled into the container, the vacuum filling time can be significantly shortened compared to conventional methods.

(3) If a degassing device as shown in Fig. 2 is used during the process of the present invention, it is possible to continuously degas Odori's liquid X and fill the container with liquid Y. can.

Therefore, it is possible to improve the filling efficiency.

(4) By using the method of the belief invention, the structure of an automatic vacuum filling device can be simplified, and therefore, a very inexpensive filling device can be made for 1q.

[Brief explanation of the drawing]

FIG. 1 is a schematic process diagram showing an embodiment of the present invention, and FIG. 2 is a schematic explanatory diagram showing an embodiment of a degassing device used in the method of the present invention. A... Process of pumping liquid, 1.11... Tank,
2... Container, 3.14... Pressure pump, B... Degassing process, 4.1G... Nozzle, 2a, 13a... Inner wall, 5... Dissolved gas, 7.19 ... Vacuum pump, C... Step of filling the degassed liquid, 8... Vacuum filling device, 9... Hydraulic pressure mechanism, 10... Container to be filled, X... Liquid, Y...Degassed liquid,
12...Liquid conduction pipe, 17...Air conduction pipe, 15.22.24.25...Solenoid valve, 20...
Liquid extraction conduit, 23.26.27... Conduit, 2
1... Sealed tank, 29... Detector.

Claims (1)

[Claims] 1) A step of pumping fluid such as brake fluid stored in a tank using a pressure pump, a step of deaerating the pumped fluid in a vacuum container, and a step of deaerating the pumped fluid in a vacuum container. A method for filling a container to be filled in a hydraulic mechanism with a liquid, the method comprising the step of filling the container to be filled in the hydraulic mechanism with the liquid via a vacuum filling device. 2) The step of degassing the pumped liquid in a vacuum container involves colliding the liquid ejected from a nozzle with the inner wall of the container, and removing the dissolved gas in the liquid through a vacuum pump. A method for filling a container to be filled in a hydraulic mechanism according to claim 1, wherein the liquid is discharged into the atmosphere.