JP3954150B2 - Liquid vacuum filling equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid vacuum filling apparatus used when filling a hydraulic brake system or the like of a vehicle with a liquid such as brake oil.
[0002]
[Prior art]
Conventionally, according to Japanese Patent Publication No. 1-226957, etc., a liquid supply gun having a liquid supply port and a suction port, a deaeration tank for storing liquid, and a liquid in the deaeration tank to a liquid supply port of the liquid supply gun 2. Description of the Related Art There is known a liquid vacuum filling apparatus including a liquid supply pump for pumping and a vacuum pump connected to a suction port of a liquid supply gun and a deaeration tank.
[0003]
When using this device to fill a filling device such as a hydraulic brake system with a liquid such as brake oil, the space inside the filling device is filled by a vacuum pump with the supply gun in close contact with the filling port of the filling device. Is vacuum-sucked through the suction port, and then the liquid in the filled device is filled with the liquid through the liquid supply port by the liquid supply pump. In this case, if bubbles or moisture are mixed in the liquid to be filled, the function of the filling equipment is adversely affected. Therefore, the liquid is stored in a degassing tank maintained at a high vacuum level by a vacuum pump, and the liquid is removed. Foaming and dehumidification are performed.
[0004]
[Problems to be solved by the invention]
In the above conventional apparatus, in order to pump liquid from the deaeration tank to the liquid supply gun, a liquid supply pump having a high supply capacity corresponding to the high degree of vacuum in the deaeration tank is required. There is a problem that becomes higher.
[0005]
In view of the above points, an object of the present invention is to provide a low-cost liquid vacuum filling apparatus that can pump liquid to a liquid supply gun with a small liquid supply pump.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a liquid supply gun having a liquid supply port and a suction port, a deaeration tank for storing liquid, and a liquid in the deaeration tank being pumped to the liquid supply port of the liquid supply gun. And a vacuum pump connected to the suction port of the supply gun and the deaeration tank, and means for reducing the degree of vacuum in the deaeration tank when the supply pump is driven. ing.
[0007]
According to the present invention, the load of the liquid supply pump is reduced correspondingly by reducing the degree of vacuum in the deaeration tank, and even a small liquid supply pump can sufficiently pump the liquid to the liquid supply gun.
[0008]
By the way, if the deaeration tank is completely opened to the atmosphere, the deaeration and dehumidification properties of the liquid are impaired, so that the inside of the deaeration tank is maintained at a certain negative pressure even while the feed pump is driven. There is a need. In this case, it is conceivable to provide a second vacuum pump with a low degree of vacuum and connect the deaeration tank to the second vacuum pump when the liquid supply pump is driven, but this makes it impossible to reduce the cost.
[0009]
In contrast, an ejector that generates suction negative pressure by the flow of air and a valve unit that disconnects the deaeration tank from the vacuum pump and connects the deaeration tank to the ejector when the liquid supply pump is driven are provided. If the suction pressure of the ejector is applied to the degassing tank when the feed pump is driven, the defoaming and dehumidifying properties of the liquid will not be impaired, and the ejector has a low unit price and running cost. Therefore, the cost can be reduced, which is advantageous.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a liquid vacuum filling device that fills a filling device such as a hydraulic brake system of a vehicle with a liquid such as brake oil.
[0011]
This apparatus includes a base unit 1 and a liquid supply gun 2 that can be brought into close contact with a liquid filling port (not shown) of a device to be filled. The liquid supply gun 2 has a liquid supply port 2a, a suction port 2b, and a salvage port 2c.
[0012]
The base unit 1 includes a deaeration tank 3 for storing the liquid to be filled, a liquid supply pump 4 including a trochoid pump for pumping the liquid in the deaeration tank 3 to the liquid supply port 2a, and the deaeration tank 3 and the suction unit. A vacuum pump 5 connected to the opening 2b via a separator 5a, and an ejector 6 connected to the deaeration tank 3 via a separator 6a and generating a suction negative pressure by the flow of air from a factory air source. Is provided.
[0013]
Further, a regulator 8 and a liquid supply valve 9 are interposed in the liquid supply passage 7 between the liquid supply pump 4 and the liquid supply port 2a, and the liquid supply valve 9 is driven while the liquid supply pump 4 is driven. When the valve is opened, liquid is pumped from the deaeration tank 3 to the liquid supply port 2a. The deaeration tank 3 is replenished with liquid via a replenishment valve 10 from a stock solution tank (not shown). Further, a salvage port 2 c is connected to the deaeration tank 3 via a salvage passage 12 provided with a salvage valve 11.
[0014]
A suction valve 14 is interposed in the suction passage 13 that connects the separator 5 a and the suction port 2 b, and an air release valve 15 is connected upstream of the suction valve 14.
[0015]
A first deaeration valve 17 is provided in the deaeration passage 16 connecting the deaeration tank 3 to the separator 5a, and a second deaeration valve 19 is provided in the deaeration passage 18 connecting the deaeration tank 3 to the separator 6a. Is installed. Further, an air release valve 20 is connected to the deaeration tank 3, and the liquid collected by gas-liquid separation in each separator 5 a, 6 a is degassed via each recovery passage 21, 22. Return to 3. In the figure, reference numeral 23 denotes a silencer.
[0016]
The liquid supply pump 4 and the valves 9, 10, 11, 14, 15, 17, 19, and 20 are controlled by a controller 24. The contents of the control will be described below.
[0017]
Normally, the first deaeration valve 17 is opened, the second deaeration valve 19 is closed, the deaeration tank 3 is connected to the vacuum pump 5, and the inside of the tank is maintained at a high vacuum level of about 10 Torr. The liquid in the tank is defoamed and dehumidified.
[0018]
When the liquid supply gun 2 is brought into close contact with the filling port in order to fill the filling device with the liquid, first, the suction valve 14 is opened, and the space in the filling device is vacuumed by the vacuum pump 5 through the suction port 2b. Sucked. When it is confirmed by the signal from the vacuum sensor 25 connected to the suction passage 13 that the predetermined degree of vacuum is reached, the suction valve 14 is closed, the liquid supply pump 4 is driven, and the liquid supply valve 9 is driven. Is opened, and the liquid is injected into the space in the filled device through the liquid supply port 2a.
[0019]
While the feed pump 4 is being driven, the first deaeration valve 17 is closed, the second deaeration valve 19 is opened, the deaeration tank 3 is connected to the ejector 6, and the inside of the tank is about 400 Torr. It becomes negative pressure and the degree of vacuum decreases. Therefore, the load of the liquid supply pump 4 is reduced, and the liquid can be efficiently pumped even with a small pump. Further, when the deaeration tank 3 is opened to the atmosphere, the defoaming and dehumidifying properties of the liquid in the tank are impaired, but such a problem does not occur because the inside of the tank is maintained at a negative pressure. When the tank internal pressure falls below the set negative pressure by the ejector 6 due to some abnormality during the operation of the liquid supply pump 4, the open / close control of the atmospheric release valve 20 is controlled based on a signal from the negative pressure sensor 26 that detects the tank internal pressure. The tank internal pressure is maintained at the set negative pressure.
[0020]
The liquid is injected until the liquid in the filling device becomes excessive and the liquid pressure in the liquid supply passage 7 rises to a predetermined pressure defined by the regulator 8. Is maintained in a pressurized state for a certain period of time after being detected by the hydraulic pressure sensor 27 connected to, to stabilize the filling liquid, and then the liquid supply valve 9 is closed and the liquid supply pump 4 is stopped. The first deaeration valve 17 is opened, the second deaeration valve 19 is closed, and the deaeration tank 3 is connected to the vacuum pump 5.
[0021]
Next, the air release valve 15 is opened and the salvage valve 11 is opened, and excess liquid is sucked and collected from the salvage port 2c through the salvage passage 12 into the deaeration tank 3 to complete one filling operation. .
When the liquid level in the deaeration tank 3 is below a specified level, the replenishing valve 10 is opened by a signal from the liquid level sensor 28 provided in the deaeration tank 3 to replenish the tank with liquid. .
[0022]
【The invention's effect】
As is apparent from the above description, according to the present invention, liquid can be efficiently pumped by a small liquid feed motor, the cost can be reduced, and the inside of the deaeration tank can be made negative pressure by an ejector when the liquid feed pump is driven. Since it can be maintained, liquid defoaming and dehumidifying properties are not impaired.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an example of the device of the present invention.
2 Liquid supply gun 2a Liquid supply port 2b Suction port 3 Deaeration tank 4 Liquid supply pump 5 Vacuum pump 6 Ejector 17 First deaeration valve (valve means)
19 Second deaeration valve (valve means)

Claims (1)

A liquid supply gun having a liquid supply port and a suction port, a deaeration tank for storing liquid, a liquid supply pump for pumping the liquid in the deaeration tank to the liquid supply port of the liquid supply gun, and a suction of the liquid supply gun And a vacuum pump connected to the deaeration tank, wherein the device is provided with means for reducing the degree of vacuum in the deaeration tank when the liquid supply pump is driven. Liquid vacuum filling characterized by comprising an ejector that generates pressure and a valve means that disconnects the deaeration tank from the vacuum pump and connects the deaeration tank to the ejector when the feed pump is driven Equipment .

Images