JPS6112834B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a liquid supply device that performs so-called vacuum filling in which the inside of a liquid container to be supplied is in a negative pressure state and filled with liquid. It is possible to prevent liquid from spouting out of the device when the liquid supply device is removed from the liquid supply port of the liquid supply container, and to maintain a constant amount of liquid ejected inside the device, and to prevent liquid from dripping from the discharge port of the removed liquid supply device. The aim is also to make it possible to prevent this.

Equipment that supplies and fills liquid by so-called vacuum filling is often used to fill cooling water for water-cooled engines on production lines, etc., but generally, it vacuums the inside of the liquid container to 10 Torr or more. The process involves creating a vacuum level of 160 torr, etc., and supplying and filling the liquid at a pressure of about 1 atm while maintaining that vacuum level.The liquid supply device performs these two steps consecutively. It is configured to be easy to use. By the way, when the above-mentioned second step is completed, the remaining air that has become diluted due to the vacuum suction is compressed again near the liquid supply port of the liquid supply container to which the liquid supply device is airtightly attached. On the other hand, residual air compressed by the pressure of the liquid supplied in the pressurized state exists in the curved liquid path in the supplied liquid container. be. For this reason, if you suddenly remove the liquid supply device when the second step described above is completed, the compressed air will expand as described above.
There is a drawback that the liquid may spout out from the liquid supply port of the liquid container. In order to prevent this gushing, open the atmosphere communication valve attached to the liquid supply device manually, etc.
The spouted liquid may be stored in a collection tank or the like, but this not only significantly reduces productivity on a production line but also has the drawback that the amount of spouted liquid cannot be regulated.

By adopting the structure described in the scope of the patent, the present invention can quickly and appropriately remove the so-called vacuum of liquid without having the above-mentioned drawbacks, and without deteriorating the working environment due to liquid leakage. A device that can perform filling has been obtained.

The configuration of the illustrated example will be explained below.

In the embodiments shown in FIGS. 1, 2, and 3, the liquid supply device consists of a main device 1 and a subdevice 2, and the main device 1 includes a liquid supply path 3 and a vacuum suction path 4. The liquid supply passage 3 is connected via a needle valve 5 to a liquid supply passage 6 which communicates with a pressurized liquid supply device (not shown). Needle valve 5
is formed integrally with a piston 8 housed in the cylinder section 7 of the main device 1, and is constantly brought into pressure contact with the valve seat section 10 of the liquid supply path 3 by the elastic force of the coil spring 9, thereby closing the path 3. When pressurized air is supplied from the pressure air supply path 11 to the piston lower chamber 12, the piston 8 moves upward against the coil spring 9, the valve seat part 10 and the needle valve 5 are separated, and the liquid supply path 3, the liquid is supplied.

The vacuum suction path 4 is formed on the outer periphery of the liquid supply path 3 in a structure similar to a gap in the main device 1, and is connected to the suction path 16 of the sub device 2, which will be described later, by the communication portion 13 and suction paths 14 and 15.
The suction path 14 is also connected to a pressure switch 17. This pressure switch 17
may have any known structure.

At the lower end of the main device 1, a discharge port 18 of the liquid supply path 3 is provided.
A feeler portion 20 having a suction port 19 of the vacuum suction path 4 is formed.

This feeler section 20 consists of a spherical sheet 23 made of an elastic material attached to the shaft end of a piston 22 housed in a cylinder 21 formed in the main device 1.
and a hook portion 24 fixed to the cylinder 21 side.

After the filler part 20 engages the latch part 24 with a mouthpiece 25 such as a water inlet of a radiator,
By supplying pressurized air from the pressurized air supply port 26 to the piston upper chamber 27, moving the piston 22 downward, and bringing the spherical sheet 23 into close contact with the upper end of the cap 25, the discharge port 18 and the suction port 19 are connected to the inside of the cap 25. The cap 25 is configured to be sealed in a state where the cap 25 is faced. When the supply of pressurized air is cut off, the piston 22 moves upward due to the elasticity of the coil spring 28, and the above-mentioned seal is broken.

Note that the main device 1 is formed with a suction path 29 communicating with the vacuum tank side and a suction path 31 connected to a suction path 30 of the sub device 2, which will be described later.

The sub-device 2 is connected to the main device 1 as shown in FIG.
It has a needle valve 32 that is a valve body that allows or shuts off communication between the suction path 16 that communicates with the vacuum suction path 4 and the suction path 30 that communicates with the suction path 29 .

The needle valve 32 moves upward when pressure air is supplied from the pressure air supply port 36 to the lower piston chamber 35 of the piston 34 installed in the cylinder part 33, and when the supply is cut off, the elasticity of the coil spring 37 increases. The valve seat 38 is configured to move downward and come into close contact with the valve seat 38.

The suction path 16 and the suction path 30 are communicated via the valve seat 38 by a cavity 39 below the valve seat 38 and a cavity 39' above the valve seat.

The needle valve 32 has a ventilation passage 40 formed as a through hole in its axis, and an opening 4 at the lower end thereof.
1 faces the empty chamber 39, and the opening 42 at the upper end faces the sealing seat 44 provided on the inner surface of the cap 43 screwed onto the cylinder part 33, so that the pressurized air can flow under the piston as described above. supplied to chamber 35;
When the piston 34 moves upward, the boss portion 45 of the piston 34 comes into close contact with the sealing seat 44, so that the opening 42 at the upper end is sealed.

Therefore, as shown in FIG. 3, the elasticity of the coil spring 37 allows the needle valve 32 to
When the suction path 16 and the suction path 30 are in close contact with each other and the communication between the suction path 16 and the suction path 30 is cut off, the suction path 16 side, that is, the suction path 16
The system of the vacuum suction path 4 that communicates with this is the liquid container side, which is completely isolated from the atmosphere.
The suction path 30 side, that is, the vacuum tank side that is a system of the suction path 30 and the suction path 29 communicating therewith, is connected to the empty chamber 3.
9, ventilation path 40, opening 42, piston upper chamber 4
6. It is communicated with the atmosphere through the atmosphere opening hole 47.

Conversely, the boss portion 45 of the piston 34 is connected to the sealing seat 44.
When the opening 42 is sealed, the liquid container side includes the suction path 16, the empty chamber 39', the empty chamber 39,
It is communicated with the suction path 30 and can receive the vacuum suction action from the vacuum tank side.

FIG. 4 shows an example of the operating circuit of the liquid supply device mentioned above, in which the vacuum pump 48 and the vacuum tank 49
A drain separator 51 and a first solenoid valve (SOL1) are connected to the vacuum pipe line 50 that connects the
A second solenoid valve (SOL2) communicating with the atmosphere is also inserted.

Further, the vacuum tank 49 is connected to a liquid recovery tank 53 through a pipe line 52 having a third solenoid valve (SOL3), and as described later, the liquid to be spouted and collected into the vacuum pipe line during evacuation is collected. It is designed to be able to be stored.

A vacuum line 54 having a fourth solenoid valve (SOL4) extends from the vacuum tank 49.
It is connected to the suction path 29 of the main device 1 shown in FIG.

A first air passage 57 extending and branching from a pressure air supply source 55 via a filter 56 is connected to a fifth air passage 57 whose downstream side can be communicated with the atmosphere during the closing operation, as shown in the figure.
The air passage 57 is connected to the pressurized air supply port 36 of the sub-device 2 shown in FIG. 3.

Further, the extended and branched second air passage 58 has a sixth solenoid valve (SOL6) that can communicate the downstream side with the atmosphere during the closing operation as shown in the figure.
It is coupled to a pressurized air supply port 26 in the filler section 20 of the main device 1 shown in the figure.

The third air passage 59, which is further extended and branched, has a seventh solenoid valve (SOL7) that can communicate the downstream side with the atmosphere during the closing operation, as shown in the figure.
It is connected to the pressure air supply path 11 in the figure.

Thus, the liquid feed path 6 of the main device 1 is connected to a pressurized liquid supply source 61 through a liquid feed path 60 .

With the above-described operating circuit, the device of the invention operates as follows.

That is, the first solenoid valve (SOL1) is opened, the second solenoid valve (SOL2) is closed to cut off communication with the atmosphere, the vacuum pump 48 is operated, and the vacuum tank 49 is set to a predetermined degree of vacuum. After also activating the supply source of pressurized air at a predetermined pressure, the latch portion 2 of the filler portion 20 of the main device 1
4 is engaged with the mouthpiece 25 of the radiator, which is the liquid container to be supplied, and when the start button (not shown) is turned on, the sixth solenoid valve (SOL6) is opened, and pressurized air is supplied through the second air path 58. is supplied to the pressurized air supply port 26 of the feeler section 20, the piston 22 shown in FIG. The filler portion 20 seals the cap 25 in a state where the discharge port 18 and the suction port 19 are firmly engaged and are exposed inside the cap 25.

Subsequently, when the fourth solenoid valve (SOL4) and the fifth solenoid valve (SOL5) are opened, pressurized air passes through the first air path 57 and enters the sub-device 2.
is supplied to the pressure air supply port 36 of the piston 34.
moves upward, and the boss portion 45 comes into close contact with the sealing seat 44.

Therefore, the gap between the needle valve 32 and the valve seat 38 is opened, and since the opening 42 of the ventilation path 40 is sealed with the sealing seat 44, the suction path 16 and the suction path 38 are closed.
is communicated with the atmosphere while being isolated from the atmosphere.

Then, the suction negative pressure in the vacuum pipe line 54 passes through the suction path 29 of the main device 1, passes from the suction path 31 to the suction path 30 of the sub device 2, the empty chambers 39, 39', and the suction path 16, and returns to the main device 1. Suction passages 15, 14, communication section 1
3 acts on the vacuum suction path 4, and suctions the air inside the radiator, which is the liquid container to be supplied, from the suction port 19.

Due to this suction, the inside of the radiator is brought to the set vacuum level after a certain period of time.

Next, when both the fourth and fifth solenoid valves (SOL4) and (SOL5) are closed, the vacuum suction operation circuit is completely shut off at the vacuum tank 49 portion, that is, the solenoid valve (SOL4), and the air is supplied to the pressure air supply port 36. Since the supply of pressurized air is cut off and the first air passage 57 is opened to the atmosphere, the piston 34
The needle valve 32 is moved downward by the elasticity of the coil spring 37, and the needle valve 32 comes into close contact with the valve seat 38, and the suction path 16 and the suction path 3 are
0 and completely cut off. At this time, the boss portion 45 of the needle valve 32 separates from the sealing seat 44, so the opening 42 is in communication with the atmosphere release hole 47, and the ventilation path 40, opening 41, empty chamber 39, suction path 30,
31, the circuit from the suction path 29 to the fourth solenoid valve (SOL4) is set to atmospheric pressure.

At this time, due to the close contact between the needle valve 32 and the valve seat 38, the portion from the suction path 16 to the inside of the radiator, which is the liquid container to be supplied, is maintained at the initially set degree of vacuum.

Next, when the seventh solenoid valve (SOL7) is opened and pressurized air is supplied from the third air path 59 to the pressure air supply path 11 of the main device 1, the piston 8
moves upward and the needle valve 5 moves up to the valve seat part 10.
The liquid supply path 3 is separated from the liquid supply path 3 and communicates with the liquid feed path 6, and the liquid is forced into the radiator, which is a liquid container to be supplied.

When the radiator is filled with liquid, most of the residual air in the radiator gathers near the base 25 and is compressed until it becomes equal to the liquid pressure. It remains in the etc.

The compressed residual air around the base 25 described above exerts pressure from the vacuum suction path 4 to the communication portion 13 and the suction path 14 . Therefore, the pressure switch 17 connected to the suction path 14 is operated by this pressure. Normally, the set pressure of the pressure switch 17 is set slightly lower than the hydraulic pressure, and when the set pressure is reached, the seventh solenoid valve (SOL7) is closed and the air passage 59 is communicated with the atmosphere. When the supply of pressurized air to the air supply path 11 is cut off, the piston 8 moves downward by the elasticity of the coil spring 9, the needle valve 5 comes into close contact with the valve seat part 10, and the supply of liquid is stopped.

Next, the fourth and fifth solenoid valves (SOL4) and (SOL5) are opened. However, the fourth solenoid valve (SOL4) is closed after a certain period of time, and the fifth solenoid valve (SOL5) is closed.
shall be equipped with a timer or the like so that the door closes after a shorter minute period of time has elapsed.

By opening the solenoid valve (SOL5),
The needle valve 32 of the sub-device 2 moves upward to open the space between it and the valve seat 38, and the air passage 40 is sealed. Therefore, the portion from the suction path 16 to the mouthpiece 25 of the radiator, which is the liquid container to be supplied, is a vacant chamber 39 that was already at atmospheric pressure, the suction ports 30 and 31, and the suction path 29.
The liquid in the cap 25 is ejected into the circuit that passes through the vacuum suction path 4 and reaches the vacuum pipe 54 due to the action of the compressed residual air. do.

The above-mentioned communication and ejection are completed in a minute time, and the inside of the supplied liquid container becomes atmospheric pressure, so after this minute time has passed, the fifth solenoid valve (SOL5) is closed by the action of the timer as described above.

Since the fourth solenoid valve (SOL4) is already open at this time, the above-mentioned ejected liquid is recovered to the vacuum tank 49 side at the same time as it is ejected by the vacuum suction action, and is stored in the liquid recovery tank 53.

As mentioned above, the fifth solenoid valve (SOL5) is closed by the action of the timer after a short period of time has elapsed, so there is no risk that the liquid in the radiator will be sucked out by the vacuum suction action for liquid recovery mentioned above. .

Even after the fifth solenoid valve (SOL5) is closed, the fourth solenoid valve (SOL4) is kept open for a short time to suck out the remaining liquid in the vacuum suction path, and then the timer is activated. It is closed at .

After that, the sixth solenoid valve (SOL6) is closed to communicate the air passage 58 to the atmosphere, and the piston 2
2 is moved upward by the elasticity of the coil spring 28, the spherical sheet 23 and the cap 25 are released from close contact, and the latch claw portion 24 is removed from the cap 25, thereby completing the operation.

Even if the latch portion 24 is removed from the cap 25 and the device is removed, the inside of the radiator, which is the liquid container to be supplied, is already maintained at atmospheric pressure, so there is no ejection of liquid from the cap 25, and the above-mentioned ejected liquid does not occur. Discharge port 18 of the removed device for recovery operation by vacuum suction
There is no dripping from the container.

In addition, when the fourth and fifth solenoid valves (SOL4) and (SOL5) are opened after the liquid supply is stopped, liquid is ejected into the vacuum suction circuit, which is already at atmospheric pressure. Therefore, if the capacity of the liquid container, the supply pressure of the liquid, the set pressure of the pressure switch, and the specifications of the liquid supply device are constant, the amount of ejection will be approximately constant.

The device of the present invention has the configuration and operation described above, and a part of the vacuum suction line is made into a circuit that guides the ejection of liquid by switching the valve body before the device is removed from the supplied liquid container. In addition, the circuit is set to atmospheric pressure in advance, and after ejection, the ejected liquid can be recovered by vacuum suction, so that when the liquid supply device is removed from the liquid supply port of the liquid container to be supplied, the liquid is ejected outside the device. It is possible to prevent this, the amount of ejection can be regulated to a constant amount, and it is also possible to prevent liquid from dripping from the discharge port of the removed liquid supply device.

[Brief explanation of the drawing]

1 is a plan view of one embodiment, FIG. 2 is a sectional view taken along the line - 1 in FIG. 1, FIG. 3 is a sectional view taken along the line 1 in FIG. 1, and FIG. 4 is an operating circuit diagram. 3...Liquid supply path, 4...Vacuum suction path, 18...Discharge port, 19...Suction port, 20...Feeler section,
32...Needle valve serving as a valve body, 40...Air passage, 49...Vacuum tank.

Claims (1)

[Claims] 1. In a liquid supply device that fills a liquid after creating a negative pressure inside the liquid container, a vacuum is created in the vacuum suction path of the filler section, which has a discharge port of the liquid supply path and a suction port of the vacuum suction path. A valve body is disposed that can selectively occupy a first position that communicates the tank side and the supplied liquid container side, and a second position that blocks communication between the two, and the valve body includes: A liquid supply device characterized in that a ventilation path is formed only in the second position to communicate the vacuum suction path on the vacuum tank side with the atmosphere.