JPS5918276B2 - Liquid supply/filling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for supplying and filling liquid into a sealed space by using negative pressure caused by vacuum suction, and improves the degree of vacuum in the sealed space in a short time. , it is possible to quickly supply and fill a predetermined amount of liquid, and it is also possible to prevent liquid from being sucked into the vacuum circuit, and when the liquid supply is completed, compressed air is sent into the vacuum circuit. Supply of liquid that can forcibly remove accidentally sucked liquid from the circuit.
The purpose is to provide a filling device.

In order to supply and fill oil or cooling water into sealed spaces such as oil chambers, oil passages, cooling water circulation systems, etc. of hydraulic equipment or water-cooled internal combustion engines, the pressure in the space is reduced by vacuuming, and then the liquid is poured. Various supply devices have been proposed, but all of these devices have the disadvantage that part of the supplied liquid is sucked into the vacuum circuit by the vacuum operation, which impairs the performance of the vacuum pump. In addition, because the liquid accumulates in the vacuum circuit, the sealed space that is the supplied liquid will not reach the specified negative pressure state until this liquid is sucked and removed during the next vacuum suction, and the vacuum will not reach the specified negative pressure state. It has the disadvantage that the working time required for pulling is significantly longer.

For this reason, when continuously supplying and filling a large number of liquids, the degree of vacuum is not large enough during the filling time set in the production line, resulting in insufficient filling volume and extra replenishment. It takes a lot of steps and time, and if evacuation is continued until a predetermined degree of vacuum is obtained, the production efficiency of the production line is unavoidably impaired.

The present invention provides a supply/filling device that does not have the above-mentioned drawbacks and can completely complete the supply/filling of liquid within a predetermined time by having the structure described in the claims. .

The configuration of the illustrated example will be explained below.

1 to 3 show a fluid supply gun 1 as an example of implementation, and the lower end of the fluid supply gun 1 is connected to an outer peripheral flange portion of a fluid supply port of a radiator R in a water-cooled internal combustion engine E, for example. A mounting claw portion 2 that is removably tightened and a crimping body 3 that is crimped to the upper circumferential surface of the liquid supply port are provided. When compressed air is supplied from the pump 6, the spring 70 descends against the elastic force and is pressed against the upper circumferential surface of the liquid supply port.

A liquid supply pipe 9 that is fixed to the main body part 11 of the liquid supply gun 1 and forms a liquid supply conduit 8 is vertically installed in the center of the crimp body 3, and the crimp body 3 has a lower end guide flange 10. It is slidably fitted into the liquid supply pipe 9.

The liquid supply pipe 9 is fixed to the main body part 11 at the upper end, and the liquid supply pipe line 8 is connected to the liquid supply pipe line 12 in the main body part 11, and the communication part 13 between the pipe lines 8 and 12 is connected to the liquid supply pipe 9. A first opening/closing valve 14, which is a needle valve, is arranged to open and close the liquid supply pipe 8.

When this first on-off valve 14 receives compressed air supplied from the air intake 15 into the lower chamber 17 of the piston portion 16,
It rises against the elasticity of the spring 18 to open the liquid supply pipe 8, and normally closes the pipe 8 by the elasticity of the spring 18.

An outer cylinder 19 that surrounds the outer peripheral area of the crimp body 3 and constitutes a cylinder for the piston part 4 is screwed and fixed to the lower end of the main body part 11, and this outer cylinder 19 and the crimp body 3
(There is a gap 20 for vacuuming on the outer periphery of the liquid supply pipe 9.
A plurality of small holes 21 are formed in the lower end surface of the guide flange portion 10 and open at the lower end surface of the crimp body 3 to form a suction port 22 .

The upper end of the evacuation gap 29 is connected to a conduit 23 bored through the main body portion 11 .

In the illustrated embodiment, a pressure switch 25, which is an example of a liquid supply amount detection device 2401 to be described later, is fixed to one side of the main body portion 11.
A pipe line 27 leading to the pressure sensitive valve 26 is communicated with the pipe line 23.

On the other hand, a valve housing 28 is fixed to the outside of the main body part 11, and a substantially U-shaped conduit is formed inside thereof, and one horizontal conduit 29 communicates with the conduit 23 inside the main body part 11. The other horizontal pipe 30 is connected to a pipe 31 bored in the main body 11, and a first on-off valve 33, which is a needle valve, is arranged in the vertical pipe 32. .

This first on-off valve 33 is constantly operated by the valve seat 3 due to the elasticity of a spring 340.
5 closes the vertical pipe 32, and when the piston part 370 receives compressed air supplied from the air pump 36, the vertical pipe 32 opens against the elasticity of the spring 34. It operates.

The aforementioned gap 20, pipe line 23, horizontal pipe line 29, vertical pipe line 32,
The horizontal conduit 30 and the conduit 31 constitute a vacuum conduit within the liquid supply gun 1 .

Further, the pressure switch 25, which is the liquid supply amount detection device 24, is displaced to the right in Fig. 1 when a pressure equal to or higher than the set pressure is applied from the pipe line 27 to the pressure-sensitive valve 26 made of a rubber plate or the like, and the switch 39 is turned ON. It is something.

In FIG. 2, reference numeral 40 indicates a liquid inlet of the liquid supply pipe 12, and reference numeral 41
is a connection port of the conduit 31.

FIG. 4 is an operational circuit diagram of the fluid supply gun 1 shown in FIGS. 1 to 3, in which a predetermined amount of fluid is supplied from the fluid supply opening O of the radiator R of a water-cooled internal combustion engine E into the cooling system of the engine E. In this embodiment, the liquid supply pipe 12 of the liquid supply gun 1 is communicated with a liquid tank through a pipe 42 via an emergency manual valve BV.

In addition, a pipe line 31 constituting a vacuum pipe line for the liquid supply gun 1
is connected to a vacuum tank 45 and a vacuum pump 46 through a vacuum circuit 44 into which a second on-off valve 4'3 is inserted.

A circuit 47 from the second on-off valve 43 to the suction port 22 of the liquid supply gun 1 is connected to a compressed air circuit 49 via a third on-off valve 48 in the vicinity of the second on-off valve 43. This third on-off valve 48 is opened by a detection signal from a pressure switch 25, which is a liquid supply amount detection device 24, as will be described later.

Prior to using the apparatus of the present invention, the vacuum pump 46 is first activated.

□ At this time, the solenoid valve 5QL-3 is OFF, the second on-off valve 43 in the vacuum circuit 44 is open, and the first on-off valve 35 in the circuit 47 is closed.

In this state, when the fluid supply gun 1 is fitted into the fluid supply opening O of the radiator R and the start switch is turned on, the solenoid valves 5QL-1 and 5QL-2 are turned on, and the circuit so,
compressed air supply source 53, regulator 54 through si
The compressed air that has passed through operates the piston parts 4 and 37 shown in FIGS. 2 and 3 to press the crimping body 3 to the liquid supply opening O, and at the same time, the first on-off valve in the evacuation line is activated. 33 is opened.

At this time, the first on-off valve 14 inserted into the liquid supply pipes 8 and 12 is kept closed.

Therefore, the cooling waterways in the radiator R and the water-cooled internal combustion engine E are evacuated and the pressure is significantly reduced.

Separately, a timer is attached to the operation system, and after a predetermined time has elapsed to achieve a predetermined degree of vacuum, the solenoid valve 5QL-2
is turned OFF, the first on-off valve 33 is closed, and at the same time, the solenoid valve 5OL-3 is also turned on, and the second on-off valve 4 is turned on.
3 to completely close the vacuum system circuit.

After this closure, after some time has elapsed, the solenoid valve 5QL-4 is turned ON by the operation of the timer, the first on-off valve 14 in the liquid supply pipes 8 and 12 of the liquid supply gun 1 is opened, and the liquid is supplied. Let it start.

As the amount of liquid supplied increases, the residual air in the cooling channel becomes
The liquid concentrates at the supply opening O, and as a result, the pressure of the air layer within the mouth rises to above atmospheric pressure.

This pressure passes through the suction port 22, the gap 20, and the conduits 23 and 27 shown in FIG. Since it is shut off by the first on-off valve 33 of the vertical pipe line 32,
It has no effect on the subsequent upstream vacuum circuit.

When the above-mentioned pressure reaches a preset pressure set in the pressure-sensitive valve 26, the switch 39 is turned on, the solenoid valve 5QL-1 is turned off, the crimp body 3 is released, and a predetermined period of time elapses due to the action of the timer. Later solenoid valve 5Q
L-4 is turned OFF, the first on-off valve 14 in the liquid supply pipes 8 and 12 is closed, and liquid supply is stopped.

At this time, if the pressure that acts on the pressure-sensitive valve 26 when the water level in the cooling channel reaches a predetermined water level is determined in advance through experiments, and this is set as the set pressure of the pressure-sensitive valve 26, the pressure that acts on the pressure-sensitive valve 26 can be set. It is possible to detect the completion of supplying a certain amount of water.

The predetermined time that elapses from the time the crimp body 3 is released until the solenoid valve 5QL-4 is turned OFF is set to about 1 second, and the amount of fluid supplied during that time is The amount is set to be enough to compensate for the drop in the liquid level at the liquid supply opening O of the radiator R caused by the release of the pressure bonding in step 3.

The operation of the timer that turns off the solenoid valve 5QL-4 described above turns on the solenoid valves 5QL-5 and 5OL-6 at the same time, opens the third on-off valve 48, and simultaneously operates the compressed air sent from the compressed air regulator 55. Compressed air is transferred from the second on-off valve 43 in the vacuum circuit 44 to the first on-off valve 33.
Press fit into the circuit 47 leading to.

Then, the solenoid valve 5QL-
2 is turned on, and the first on-off valve 33 is opened.

Therefore, from the second on-off valve 43 to the suction port 2 of the vacuum tube.
2, even if liquid is sucked in and exists in the vacuum circuit, it is blown out from the suction port 22 by the action of the compressed air and is completely eliminated.

After blowing out compressed air for a predetermined time using a timer, solenoid valves 5QL-2゜5QL-3, 5Q
L-5 and 5QL-6 are turned OFF, and the entire device is returned to the state immediately before vacuuming to prepare for the next liquid supply and filling.

In addition, if a cooling water sub-tank etc. is attached,
At an appropriate time such as when starting liquid supply, solenoid valve 5QL-
7 is turned on, the on-off valve 56 is opened, and the auxiliary liquid supply pipe 57 is turned on.
The liquid may be supplied into the sub-tank from the tank, and after the liquid has been supplied for a predetermined time, the solenoid valve 5QL-7 may be turned off and the on-off valve 56 may be closed.

In FIG. 4, reference numeral 58 is a drain separator, 59 is a vacuum regulating valve, and 5QL-8 is a vacuum tank 45 and a vacuum pump 46.
The solenoid valve 5QL-9 inserted between them is a solenoid valve for opening to the atmosphere.

In the illustrated example, a pressure switch is used as the liquid supply amount detection device, but this is suitable for supplying and filling flammable liquids such as oil. Of course, you can replace it with a type liquid level gauge or the like.

Note that the operating circuit of each solenoid valve and the adjustment mechanism during operation using a timer, etc. may be of any known configuration without departing from the purpose of the present invention.

The device of the present invention has the configuration and operation described above, and when drawing a vacuum, the liquid supply pipe side of the liquid supply gun is completely closed by the first on-off valve, and the liquid is drawn into the vacuum circuit. There is no risk of being sucked in, and when the evacuation is completed, the first on-off valve of the evacuation line in the liquid supply gun and the second on-off valve provided between the line and the vacuum pump are closed. Since liquid supply is started after the vacuum circuit is completely closed, there is no possibility that liquid will be sucked into the vacuum circuit in this step as well.

The amount of liquid to be supplied is detected by a liquid supply amount detection device attached to the pipeline between the first on-off valve and the suction port of the evacuation pipeline, and the detection signal is used to close the liquid supply pipeline. Since it is constructed as follows, it is also possible to use a pressure switch or the like.

Furthermore, when the predetermined amount of liquid has been supplied, the vacuum circuit between the first on-off valve and the second on-off valve, both of which are closed, is opened, and the third on-off valve is opened. communicating with a compressed air circuit, then opening the first on-off valve to send compressed air into the circuit leading from the second on-off valve to the suction port;
Since it blows out what has accumulated in the circuit from the suction port and removes it, even if there is liquid sucked into the vacuum circuit and it remains, it can be completely removed. In the next evacuation process, a strong vacuum suction action can be immediately applied to the supplied liquid.

Note that there is no risk of liquid being sucked into the circuit from the second on-off valve in the vacuum circuit to the vacuum tank.

Therefore, according to the device of the present invention, the working time required for evacuation is always as short as the set time, and the degree of vacuum is always kept constant during each repeated liquid supply/filling cycle, so that a predetermined amount of Liquid supply and filling can be performed quickly and accurately, which has the effect of significantly improving production efficiency.

[Brief explanation of the drawing]

Figure 1 is a plan view of a liquid supply gun as an example of implementation, Figures 2 and 3 are cross-sectional views taken along lines ■-■ and ■-■ in Figure 1, respectively, and Figure 4 is an operating circuit diagram. . 1...Liquid supply gun, 8, 12...Liquid supply pipe, 14°33...First on-off valve, 22...
... Suction port, 24 ... Liquid supply amount detection device, 43
...Second on-off valve, 44...Vacuum circuit, 46...Vacuum pump, 48...Third
Opening/closing valve, 49... Compressed air circuit, [constituting the vacuum pipe line], 20... Gap, 23.
...Pipe line, 29,30... Horizontal pipe line, 31
...Pipe line, 32... Vertical pipe line, 0...
...Liquid supply opening.

Claims (1)

[Claims] 1. A liquid supply gun that is detachably attached to a liquid supply opening for the liquid to be supplied is provided with at least a liquid supply line, a vacuum line, and a first on-off valve for each line, and further includes a first on-off valve for each line. A liquid supply amount detection device is attached to the pipe between the first on-off valve and the suction port in the suction pipe, and the liquid supply pipe is communicated with the liquid tank, and the vacuum pipe is connected to the suction port. is connected to a vacuum circuit connected to the vacuum pump via a second on-off valve, and the circuit from the second on-off valve in the vacuum circuit to the suction port of the evacuation line is connected to the second on-off valve. In the vicinity of the on-off valve, the first on-off valve of the liquid supply system and both the first and second on-off valves of the vacuum system are connected to the compressed air circuit via a third on-off valve, They are assembled so that the opening and closing operations are opposite to each other, and the third on-off valve detects the amount of liquid supplied when both the first and second on-off valves of the vacuum system are closed. The vacuum circuit between the first and second on-off valves is opened in response to a sensing signal from the device;
An operating circuit is configured to communicate with the compressed air circuit, and the operating circuit is configured such that the first on-off valve of the evacuation system is opened after the third on-off valve is opened. A liquid supply/filling device characterized by: