JPS6121395A - Liquid fixed-quantity filler - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an apparatus for automatically and accurately filling a liquid container such as a reserve tank of a hydraulic brake circuit with a fixed amount of liquid such as hydraulic oil.

Conventional techniques and problems to be solved by the invention Conventionally, in order to automatically fill a fixed amount of liquid such as hydraulic oil into a liquid container such as a reserve tank of a hydraulic brake circuit, a filling pipe inserted into the liquid container is used. There is a method in which a float valve is installed at the tip, and when the liquid level reaches a certain height, the float valve closes and stops the supply of liquid, or when the liquid to be filled is conductive, the electric horizontal bar is connected to the liquid container. A method was adopted in which the liquid supply was stopped by closing an electromagnetic on-off valve installed in the supply pipe using a signal emitted when the liquid surface came into contact with the tip of the valve. During filling, the liquid level moves up and down due to ripples, making it impossible to accurately control the liquid level using a float valve or electrode rod.
When the injection tube is removed from the liquid container, the liquid drips from the injection tube and contaminates the surrounding area.

The present invention eliminates these drawbacks, allows the level of the filled liquid to be maintained at an accurately constant level, and prevents the liquid from dripping when removing the injection tube after filling. It is an object of the present invention to provide a liquid quantitative filling device as described above.

Embodiment A first embodiment in which the present invention is applied to a device for filling brake oil into a hydraulic brake circuit will be described with reference to FIG.

In the figure, a is the reserve tank b, brake pedal C
This is a hydraulic brake circuit in which a mask cylinder d and an actuator e driven by a cylinder are connected through a pipe, and the filling device of this embodiment fills the mask by repeatedly pressing the brake pedal C while injecting brake oil into the reserve tank b. By driving the cylinder d, the entire circuit is filled with brake oil, and during filling, the air discharged from the air vent f provided in the actuator e and the brake oil mixed with air are collected, and the base The hollow space of the cylinder 2, which is vertically installed above the cylinder 1, is divided into upper and lower parts by a horizontal partition plate 3 fixed at the center in the height direction, and the upper and lower parts of the cylinder 2 are tightly connected and can freely slide up and down. The upper piston 4 and lower piston 5 fitted into the center hole 6 of the partition plate 3
is fixed to the upper and lower ends of a rod 7 which passes through the rod 7 tightly and can freely slide vertically, and is integrally connected between the cover plate 10 fitted to the upper end of the cylinder 2 and the upper piston 4. The upper chamber A is a bottom plate 1 fitted to the lower end of the cylinder 2.
1 and the lower piston 5, and when pressurized air is supplied from a port 8 transparently provided from the outer periphery of the cylinder 2 to the upper surface of the partition plate 3, both pistons 4.
5 rises, and both pistons 4.5, to which pressurized air is supplied from the port 9 transparently provided from the outer periphery of the cylinder 2 to the lower surface of the partition plate 3, descend, and the volumes of the upper chamber A and the lower chamber B are reduced. It alternately increases and decreases. The two ports 8.9 of the partition plate 3 are each connected as shown to a solenoid-operated first directional valve 12 with a return spring, which first directional valve 12 is connected to a source of pressurized air. 13 and vacuum pump 14 as shown in the figure, and
One port 15 transparently installed in the cover plate 10 of the cylinder 2 has an air vent pipe 1 with a stop valve 16 and a throttle valve 18 interposed therebetween.
7 is connected, and the other end of this air vent pipe 17 is connected to an air vent hole 20 of a cap 19 that is attached to the inlet of the reserve tank b, and the other end of the air vent pipe 17 is connected to the air vent hole 20 of the cap 19 that is attached to the inlet of the reserve tank b. 21 is connected as shown to a solenoid-driven second directional valve 22 also equipped with a return spring;
This second directional switching valve 22 is connected to a gas-liquid separation filter 23 connected to the vacuum pump 14 and a recirculation hole 25 of a brake oil storage tank 24, respectively, as shown in the figure.
Furthermore, a port 26 transparently provided in the bottom plate 11 of the cylinder 2
is connected as shown to a solenoid-driven third directional valve 27 also equipped with a return spring, and this third directional valve 27 has an injection pipe extending through the cap 19 of the reserve tank b. Supply pipe 29 connected to 28 and storage pipe 29
Suction pipe 30 inserted into brake oil in tank 24
are connected as shown in the diagram, and the reserve tank b
The tip of the injection pipe 28 is set to match the level of the brake oil to be filled, and is connected to the air vent f provided in the actuator e of the hydraulic brake circuit a.
is connected to the air vent pipe 17 by a transparent pipe 31. 1st. Second and third directional valves 12.22.
27 and the vacuum pump 14 are controlled by a control device 32.
2, and a detection rod 33 protruding from the upper surface of the upper piston 4 of the cylinder 3 is connected to the output terminal of the lid plate l.
A dog 34 is fixed to the protruding end of the limit switch 3 which passes through the O tightly and freely, and has a contactor facing the path through which the dog 34 passes.
5 are arranged at predetermined intervals, and each limit switch 35 is connected to an input terminal of the control device 32.

Next, the operation of this embodiment will be explained.

'' With the two-part piston 4 and the lower piston 5 in the upper end position shown by the solid line in the figure, when the solenoids of the second and third directional control valves 22 and 27 are energized and switched to the solenoid side, the cylinder 2 The lower chamber B is connected to the reserve tank b, and the upper chamber A is connected to the vacuum pump 1 via the filter 23.
4 respectively. Here, when the solenoid of the first directional control valve [2] is energized and switched to the solenoid side, pressurized air is supplied from the pressurized air supply source 13 through the port 9 on the lower side of the partition plate 3 to the empty space on the upper surface of the lower piston 5. Pressurized air is supplied to the upper piston 4 and the air in the cavity on the lower surface of the upper piston 4 is discharged from the upper port 8 through the vacuum pump 14, so that the upper piston 4 and the lower piston 5 move inside the cylinder 2 integrally. descend to.

-The volume into the lower chamber B increases and the volume of the lower chamber B decreases, and the brake oil that was filled in the lower chamber B is transferred to the bottom plate 11.
from the port 26 of the reserve tank B through the supply pipe 29.
By repeatedly pressing pedal C,
The brake oil in the reserve tank B is filled into the mask cylinder d and the actuator e, and the air remaining in these devices and pipes and the brake oil mixed with air are discharged from the air vent f.
The check valve 16 opens due to the expansion of the volume of the upper chamber A and the negative pressure in the upper chamber A due to suction by the vacuum pump 14, and air and brake oil mixed with air flow through the transparent pipe 31 and the air vent pipe 17. and flows into the upper chamber A. A throttle valve 18 provided in the air vent pipe 17 is used to maintain negative pressure on the upper chamber A side. Reserve tank B
When it is visually confirmed that the liquid level of the brake oil inside exceeds the height of the tip of the injection pipe 28 and that air is no longer mixed into the brake oil flowing inside the transparent pipe 31, the air vent f is opened. Close the on-off valve provided in the box by hand and remove the transparent pipe 31. Next, the solenoid of the third directional control valve 27 is deenergized and switched to the return spring side, and with the lower chamber B communicating with the storage tank 24, the upper and lower pistons 4.5 continue to descend and open the lower chamber B. The brake oil in the lower chamber B is returned to the storage tank 24, and as shown by the chain line in the figure, the lower piston 4.5 reaches the lower end of its stroke and the brake oil in the lower chamber B is completely returned to the storage tank 24. When the air is released, the solenoid of the first directional control valve 12 is deenergized and switched to the return spring side, and pressurized air is supplied to the empty space on the upper surface side of the partition plate 3 of the cylinder 2, and the lower surface The pressurized air in the chamber is discharged from the vacuum pump 14, and the upper and lower pistons 4 and 5 begin to rise. Immediately after this, the third directional control valve 27 is switched to the solenoid side for a short period of time, and the lower chamber B is communicated with the reserve tank b, and the brake oil that has been excessively injected into the reserve tank B is transferred to the injection pipe 28. It is sucked back from the tank, flows backward through the supply pipe 29, and is sucked back into the lower chamber B. This suction is carried out until the liquid level of the brake oil in the reserve tank B falls to the level of the tip of the injection pipe 28, and when the liquid level falls to that level and air is sucked in, the third The directional switching valve 27 is switched to the solenoid side, the lower chamber B is communicated with the storage tank 24, and the brake oil therein is sucked up into the lower chamber B. On the other hand, the upper chamber A is in communication with the vacuum pump 14 until the middle of the downward stroke and upward stroke of the upper and lower pistons 4.5, and among the air and brake oil sucked through the air vent pipe 17, the brake oil is The air and fine particles of brake oil that have accumulated on the upper surface of the upper piston 4 are sucked out from the port 21, and the brake oil is separated by the filter 23, and the upward stroke of the upper and lower pistons 4.5 In the final stage, the second directional switching valve 22 is switched to the return spring side, and the brake oil accumulated on the upper surface of the upper piston 4 is discharged into the storage tank 24.

As shown by the solid line in the figure, when the lower piston 4.5 reaches the upper end position, the air sucked in at the final stage of suction back from the reserve tank B accumulates in the upper part of the lower chamber B. , some of them become air bubbles and get mixed into the brake oil, but the mixed air bubbles gather at the top due to buoyancy, so when the upper and lower pistons 4.5 descend again, they are released from the port 26 of the bottom plate 11 to the hydraulic brake circuit. Air is not mixed in the brake oil at the lower end of the cylinder 2 that is supplied to the cylinder 2. When the suction from the reserve tank b is completed during the upward stroke of the upper and lower pistons 4.5, the cap 19 is removed. , the following new hydraulic brake circuit a
The cap 19 is attached to the reserve tank b, the transparent pipe 31 is connected to the air vent f, and the same operation as described above is repeated. Note that the vacuum pump 14 may be operated from the middle of the downward stroke of the upper and lower pistons 4.5 to the middle of the upward stroke of the upper and lower pistons 4.5, and even in this case, the inside of the upper chamber A is
During the downward stroke of the upper and lower pistons 4.5, the pressure becomes negative as the volume increases, and air can be vented from the hydraulic brake circuit a. Starting and stopping of this vacuum pump 14 and the first. Second and third directional control valves 12, 22.27
Excitation and release of the solenoids are performed by the upper and lower pistons 4.
This is done by the engagement of each limit switch 35 with a dog 34 that moves up and down along with 5, and by a signal issued from the control device 32 by a timer provided as necessary.

Next, a second embodiment of the present invention will be described based on FIG. 2.

In the figure, 52 is a cylinder vertically installed on a base 51, a partition plate 53 is fixed to the vertical center of the hollow space, and an upper piston 5 is fitted into the hollow spaces above and below.
4 and the lower piston 55 are physically connected by a rod 57 passing through the center hole 56 of the partition plate 53, and the cylinder 52
An upper chamber C is formed between the cover plate 60 fitted to the upper end of the cylinder 52 and the upper piston 4, and a lower chamber C is formed between the bottom plate 61 fitted to the lower end of the cylinder 52 and the lower piston 55. Ports 58.5 opened on the upper and lower surfaces of the partition plate 3, respectively.
9 are respectively connected to the first directional switching valves 62 as shown in the drawings, and the first directional switching valves 62 are connected to the pressurized air supply source 63 as shown in the drawings. One port 65 formed in the air vent pipe 60 is connected to an air vent pipe 67 via a check valve 66.
7 is a cap 69 attached to the opening of the reserve tank h of the hydraulic circuit g consisting of the reserve tank h and the operating device i.
The air vent j provided in the actuating device i is connected to the air vent pipe 67 through a transparent pipe 81, and the other port 71 is It is connected to the vacuum pump 64 and the return hole 75 of the hydraulic oil storage tank 74, and one of the holes 1-76 of the bottom plate 61 of the cylinder 5 is connected to the check valve 77.
The other port 68 is connected to the suction pipe 80 of the storage tank 74 via the cap 6 attached to the reserve tank h.
It is connected to the injection pipe 78 of 9 by a supply pipe 79,
A detection rod 83 is provided protruding from the upper end of the rod 57 connecting the upper and lower pistons 54 and 55 and protrudes toward the upper surface of the cover plate 60.
A dog 84 is formed at the tip of the dog 84, and several limit switches 85 that engage with this are arranged, and these limit switches 85, the vacuum pump 64, and the first and second directional control valves 6.2.72 Solenoids are connected to the control device 82, respectively.

The operation of the liquid filling device having the above configuration is basically the same as the operation of the device of the first embodiment, so a description of the parts having the same configuration will be omitted, but in this embodiment, the upper and lower A communication hole 100 is formed in the center of the rod 57 that connects the pistons 54 and 55, and its upper end communicates with the upper chamber C via a small hole 101 formed at the base of the detection rod 83, and its lower end communicates with the upper chamber C. It communicates with the upper part of the lower chamber through the float valve E of No. 1, and the supply pipe 79 has a second
A float valve F is provided. First float valve E
A cylindrical body 102 is formed with a valve chamber 103 whose bottom surface is open at the center and an upper valve hole 104 is formed at its upper end.
0, a lower valve hole 106 is formed in the upper end thereof, and a circumferential groove 1 is formed on the outer periphery.
07 and the lower valve hole 106 communicate with each other through a small hole 108, and a nut 109 that tightens and fixes the lower piston 55 to the rod 57 and the rod 57 have a small hole 105 that communicates with the circumferential groove 107 of the plug 105. A hole 110 is formed, and this small hole 110 opens into a recess 111 formed by hollowing out the lower part of the lower piston 55, and further,
The valve chamber 103 has a structure in which a spherical valve body 112 having a specific gravity smaller than that of hydraulic oil, which is a filling liquid, is fitted.
The second float valve F is a valve box in which a vertically elongated valve chamber 115 is formed, which has an L-shaped communication hole 114 continuous to the bow 1-68 of the bottom plate 61 and a valve hole 116 continuous to this 114 at the lower end. 113 is fixed to the bottom plate 61, and this valve box 1
On the upper surface of 13, there is a discharge hole 1 to which a supply pipe 79 is connected at the center.
A cover plate 117 having a shape of 18 is applied, and this cover plate 11
A stopper 119 is provided on the lower surface of the stopper 7 to project into the valve chamber 115 at a distance from the discharge hole 118, and a spherical valve body 120 having a specific gravity smaller than that of the circulating hydraulic oil is fitted into the valve chamber 115. When the upper and lower pistons 54.55 are in the upper end position shown by the solid line in the figure, if air accumulates in the upper part of the lower chamber, the lower piston 54.55 At the beginning of the downward stroke, the air flows into the lower valve hole 106 of the float valve E, pushes up the valve body 112 that was blocking the lower valve hole 106 due to its own weight, opens the valve, flows into the valve chamber 103, and flows into the upper valve chamber 103. Valve hole 1
04 to the upper chamber C through the communication hole 100 and the small hole 101.
When the air in the lower chamber is completely discharged and hydraulic oil flows into the valve chamber 103, the valve body 112 rises due to buoyancy and is pressed against the upper valve hole 104, as shown by the chain line in the figure. In order to block this, the release of hydraulic oil to the upper chamber C is minimized, and in the subsequent downward stroke, the hydraulic oil in the lower chamber is normally pressurized and flows to the port 68.
is fed under pressure to the second float valve F, and due to its own weight it closes to the valve hole 1.
16 and pushing up the valve body 120, which opens the valve, flows into the valve chamber 115, and is supplied from the discharge hole 118 through the supply pipe 79 to the reserve tank h. Here, the valve body 120 of the second float valve F rises due to buoyancy, as shown by the chain line in the figure, but because it comes into contact with the stopper 119, it does not block the discharge hole 118. The upper and lower pistons 54 and 55 descend to the positions indicated by chain lines in the figure, and the liquid level of the hydraulic oil in the reserve tank h becomes higher than the tip of the injection pipe 78, and air flows into the hydraulic oil flowing out from the transparent pipe 81. When it is confirmed that there is no more contamination, the on-off valve provided at the air vent f is manually closed and the transparent pipe 81 is removed. Next, when the upper and lower pistons 54,55 start to rise due to switching of the first directional control valve 62, the pressure in the lower chamber decreases, causing the valve chamber l of the first float valve E to rise.

The hydraulic oil in 3 returns to the lower chamber, and as a result, the valve body 1
12 is lowered and the lower valve hole 106 is closed, and due to the increase in the volume in the lower chamber, the hydraulic oil that had been injected excessively into the reserve tank h is sucked back from the injection pipe 78 and is transferred to the supply pipe 79.
flows backwards and is returned to the lower chamber through the second flow 1--valve F-- which is opened due to the floating of the valve body 120. The liquid level of the hydraulic oil in the reserve tank h falls and the suction is completed when it matches the height of the tip of the injection pipe 78, and the hydraulic oil in the valve chamber 115 of the second float valve F disappears and the injection pipe 78 When the valve body 120 is filled with air sucked in from the lower chamber, the valve body 120 descends under its own weight and closes the valve hole 116, which prevents excess air from being sucked into the lower chamber and prevents the upper and lower pistons 54, 55 from being sucked into the lower chamber. As the rise continues, the pressure in the lower chamber further decreases, the check valve 77 opens, and the hydraulic oil in the storage tank 74 flows into the lower chamber from the suction pipe 80. In this way, in this embodiment, since the second float valve F is interposed in the supply pipe 79, it is possible to prevent excess air from being sucked into the lower chamber at the time of sucking back. −
Since the first float valve E is provided in the piston 55, the piston 5
At the beginning of the downward stroke at 4.55, the air in the lower chamber is exhausted through the upper chamber C. Therefore, as in the first embodiment, after filling the reserve tank,
There is no need to lower the piston to the lowest position and return the air-containing liquid to the tank, which has the advantage of shortening cycle time.

As specifically explained with the above embodiments, the first invention of the present application is to insert the injection tube from above into the liquid container to be filled so that the tip thereof is located at a constant height. It is connected to a pump capable of suction operation, and the liquid is filled into the liquid container to a height above the tip of the injection tube by the pump's pressure feeding operation, and then the liquid in the liquid container is filled by the suction operation of the pump. The gist is that the height of the liquid level is made to match the height of the tip of the injection tube by suction, and the suction is performed after the liquid level undulating due to injection is stabilized. The height of the liquid level can be precisely matched to the height of the tip of the injection tube, and the suction back prevents liquid from remaining at the tip of the injection tube, so liquid will not drip when the injection tube is removed. In addition, since the sucked back liquid is directly collected by the pump, the liquid is not wasted and the fixed amount of liquid can be filled efficiently. In addition to the structure of the first invention, a second invention provides a pipe line connecting the injection pipe and the pump with a valve seat at an opening on the lower surface connected to the pump, and the injection pipe is provided on the L side. The gist of the present invention is to provide a float valve in which a valve body having a specific gravity smaller than that of the liquid is freely fitted in a cavity having an opening connected to the liquid, and in addition to the effects of the first invention,
The amount of air that is sucked in and mixed into the liquid inside the pump after suction is completed can be minimized, and it has the effect of preventing problems such as malfunctions caused by air mixed into the liquid being filled. play.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention, and FIG. 2 is a circuit diagram of a second embodiment. a: Hydraulic brake circuit (to be filled) b,) t: Reserve tank f, j: Air vent g: Hydraulic circuit (to be filled) 2.52 Niji cylinder 3.53: Partition plate 4.5
4: Upper piston 5.55: Lower piston 7.57:
Rod 13.63: Pressurized air supply source 14.64: Vacuum pump I7.67: Air vent pipe 24.74: Storage tank 28.78: Injection pipe 29° 79: Supply pipe
32.82: Control device 100: Communication hole A, C: Upper chamber B, D: Lower chamber E: Valve to flow 1

Claims (1)

[Claims] 1. Insert an injection tube from above into a liquid container to be filled so that its tip is positioned at a constant height, connect the injection tube to a pump capable of suction operation, and pressurize the pump. After the liquid container is filled with liquid to a height above the tip of the injection tube by operation, the liquid in the liquid container is sucked by the suction operation of the pump to adjust the liquid level to the level above the tip of the injection tube. A liquid quantitative filling device 2 characterized by having a structure that matches the height of the liquid container.An injection tube is inserted from above into a liquid container to be filled so that its tip is positioned at a constant height, and the injection tube is operated as a suction operation. The liquid container is filled with liquid to a height above the tip of the injection tube by the pressure feeding operation of the pump, and the liquid in the liquid container is sucked by the suction operation of the pump. The height of the surface is made to match the height of the tip of the injection tube, and the pipe connecting the injection tube and the pump is provided with a valve seat at the opening on the lower surface connected to the pump, and a valve seat is provided on the upper surface. A liquid quantitative filling device characterized in that a float valve in which a valve body having a specific gravity smaller than that of the liquid is fitted in a space having an opening connected to the injection pipe so as to freely float is interposed therein.