JPH0118859Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention is for filling a workpiece such as a radiator or brake oil pipe of an automobile or a refrigerant container of a refrigeration system with a liquid such as radiator fluid, brake oil, or refrigerant. When the workpiece is evacuated in advance, the liquid adhering to the inside of the workpiece or the piping connected between the workpiece and the vacuum pump is vaporized and sucked into the vacuum pump,
This invention relates to a vacuum evacuation device that has been improved so that vacuum pump gaskets, pump chamber wall members, etc. do not corrode, swell, etc. and impede evacuation.

[Technical background of the invention] In general, when filling a necessary liquid into a container with a complicated chamber structure or a long object such as a refrigerant container for an automobile radiator, brake system, or refrigeration system, these containers ( (hereinafter referred to as work)
After creating a vacuum inside the tank, it is filled with liquid such as radiator fluid, brake oil, or refrigerant.

FIG. 1 shows a conventional vacuum/filling apparatus for evacuating a workpiece before filling with liquid as described above. In FIG. 1, reference numeral 1 denotes a workpiece, which is connected to a separator 3 for gas-liquid separation through a connecting pipe 2.
This separator 3 is connected to a drain pipe 5 having a cap 4 at the bottom thereof, and is also connected to a vacuum pump 7 via a connecting pipe 6. The part indicated by the two-dot chain line is for filling the workpiece 1 with the necessary liquid, and has a configuration in which a liquid tank 8 and a control valve 9 are provided between the tank 8 and the workpiece 1. It is.

In order to fill the workpiece 1 with liquid using the vacuum/filling device having such a configuration, first close the control valve 9 and then operate the vacuum pump 7 to fill the workpiece 1 with liquid.
Lower the air pressure in the connecting pipe 2 and separator 3. This completes the evacuation of the workpiece 1, and then when the control valve 9 is opened, the liquid in the liquid tank 8 is completely discharged from the workpiece 1.
It will be filled inside.

Therefore, since the liquid filled into the work 1 from the liquid tank 8 when filling the liquid is also attached to a part of the inner wall of the connecting pipe 2, the next time another work 1 is filled with the liquid.
When evacuating the air, it is necessary to prevent the air from being sucked into the vacuum pump 7 by the suction action of the vacuum pump 7. Also, if the liquid is in workpiece 1 from the beginning,
If the liquid adheres to the inside of the vacuum pump 7, it is necessary to prevent the liquid from being sucked into the vacuum pump 7 (for example, when refilling the workpiece 1 that has already been filled). Separator 3 was provided for this purpose.
The liquid sucked together with the air flows through this separator 3.
The liquid drips due to gravity within the separator 3 and accumulates at the bottom of the separator 3. Thereafter, when the liquid accumulated at the bottom reaches a certain amount, it is drained out through a drain.

[Problems with the Background Art] However, during the evacuation, the pressure inside the workpiece 1, the connecting pipe 2, the separator 3, etc. gradually decreases according to the suction action of the vacuum pump 7.
The boiling point of the liquid decreases, and the liquid evaporates into vapor, which is sucked by the vacuum pump 7. In this case, if the liquid has chemical properties that corrode or swell the connecting gasket member of the vacuum pump 7 or the pump chamber wall member, it may be impossible to maintain airtightness for evacuation. It becomes possible. If the members used on the vacuum pump side are susceptible to the above-mentioned chemical changes, the connecting gasket member and the vacuum pump 7 must be replaced frequently.
Examples of liquids that cause the above-mentioned chemical changes to packing members include Freon gas used as a refrigerant, and ethylene glycol-based antifreeze contained in recent brake oils, radiator fluids, and the like. In order to solve this problem, in the past, a packing member or other member had to be selected and used for each type of liquid, creating the complication of using a different vacuum pump 7 or the like for each type of filling liquid.

[Purpose of the invention] The present invention was developed in view of the above circumstances, and it is possible to perform vacuuming while completely separating gas and liquid regardless of the type of liquid to be filled into the workpiece, and it is It is an object of the present invention to provide a vacuum evacuation device that does not require replacing the vacuum pump or connecting packing members depending on the situation, and does not deteriorate the life of the vacuum pump.

[Summary of the invention] A workpiece and a vacuum pump side are connected through a separator for gas-liquid separation, and the workpiece is evacuated through the separator, and the inside of the separator is separated into a vacuum pump side chamber and a workpiece side chamber. - A separating member is disposed within the separator, which divides the chambers while variablely expanding and contracting the respective volumes of the two chambers inversely proportionally.

[Embodiments of the invention] The present invention will be described below with reference to illustrated embodiments. FIG. 2 is a block diagram showing a first embodiment of the present invention. Workpiece 11 such as a refrigerant container or radiator
is connected to a control valve 13 by a first connecting pipe 12, and this control valve 13 and a separator 1 for gas-liquid separation are connected to each other.
4 through the second connecting pipe 15 and the workpiece side intake/discharge port 16 of the separator 14,
The control valve 13 prevents the filling liquid from entering the separator 14 from a liquid tank (not shown) (see FIG. 1) during liquid filling. A drain pipe 17 having a drain socket 18 is connected to the bottom of the separator 14, and the liquid accumulated in the separator 14 is transferred to the liquid tank as necessary according to instructions from a liquid level detection means (not shown) provided in the separator 14. The base 21 is constructed so that it can be discharged or disposed of, and the opening 20 is communicated with the vacuum pump side intake/discharge port 19.
It houses the bellows 22 to which the bellows 22 is attached.

This bellows 22 connects the inside of the separator 14 to a work-side airtight chamber 2 including the work-side suction/discharge port 16.
3 and a vacuum pump side airtight chamber 24 including the vacuum pump side suction/exhaust port 19, and
The work side airtight chamber 23 and the vacuum pump side airtight chamber 2
It is configured to be able to expand and contract in response to changes in the relative atmospheric pressure. The bellows 22 is made of a synthetic resin such as nylon, which is not susceptible to chemical changes such as corrosion and swelling. The bellows 22 may be configured to apply a biasing force to expand itself when there is no change in the relative air pressure between the workpiece-side hermetic chamber 23 and the vacuum pump-side hermetic chamber 24. Furthermore, in this case, a pressurizing pump is provided externally and the bellows 22 is
The vacuum pump side airtight chamber 24 may be enlarged.

Further, the suction/discharge port 19 of the separator 14 has three
One and the other of the branch connecting pipes 25 are connected. This 3
The middle end of the branch connecting pipe 25 is connected to the outside air (air) via a first control valve 26, and the other end is connected to a vacuum pump 29 via a second control valve 27 and a connecting pipe 28.
It is connected to the suction port 30 of. The first of these,
The opening and closing of the second control valves 26 and 27 are controlled by the first
Control valve 26 is closed and second control valve 27 is opened. Then, when the bellows 22 contracts as shown by the two-dot chain line, the second control section 27 is closed and the first control section 26 is opened.

Next, the operation of the vacuum evacuation device as described above will be explained. First, the workpiece 11 is connected to the first connecting pipe 12, and the control valve 13 is opened. At this time, bellows 2
2 expands by a pressurizing pump connected through the first control valve 26 or by its own expanding power,
The work side airtight chamber 23 is filled with outside air approximately equal to the volume of the separator 14 so as to be narrow. Then, the first control valve 26 is closed, the second control valve 27 is opened, and the vacuum pump 29 is operated for suction, so that the air in the airtight chamber 24 on the vacuum pump side of the bellows 22 is suctioned by the vacuum pump 29. Due to this suction, the bellows 22 contracts so that the vacuum pump side airtight chamber 24 narrows, and the volume of the workpiece side airtight chamber 23 expands by the contracted volume, and the air pressure of the workpiece 11 decreases. When the atmospheric pressure of the workpiece 11 reaches the required pressure, evacuation is stopped, the control valve 13 is closed, and the workpiece 11 is filled with liquid. Next, if another workpiece 11 is connected and the control valve 13 is opened, the bellows 22 will further contract and the other workpiece 11 can be evacuated. Also, the bellows 22 is
When the second control valve 27 is closed, the bellows 22 will expand naturally (or when the first control valve 27
6 is opened and the pressure inside the bellows 22 is increased by the pressurizing pump, the bellows 22 expands), and the workpiece 11 can be evacuated again.

In the above operation description, a case has been described in which a large number of workpieces 11 are evacuated by contracting the bellows 22 in stages. However, as another vacuuming operation, one contraction of the bellows 22 evacuates one workpiece 11. Alternatively, if it is not possible to evacuate one workpiece 11 in one contraction, the bellows 22 may be expanded and evacuated while maintaining the degree of vacuum in the expanded work-side airtight chamber 23. You may also do so. In the latter case, there is an advantage that the workpiece 11 can be brought into a high vacuum without increasing the volumes of the separator 14 and the bellows 22.

As is clear from the explanation of the vacuum suction operation above,
For example, there is no possibility that the vaporized gas of the liquid adhering to the first connecting pipe 12 during liquid filling will be sucked into the vacuum pump 29 side. Therefore, it is possible to eliminate the conventional drawback that the connection packing member (not shown) provided at the suction port 30 of the vacuum pump 29 or the vacuum pump chamber wall member is chemically changed, and the vacuum pump 29 can be adjusted according to the chemical properties of the liquid. There is no need to select a packing member or to deteriorate the performance of the vacuum pump 29.

Next, FIG. 3 shows a second embodiment of the present invention.
Components corresponding to those in the drawings are given the same reference numerals, and their characteristic configurations will be explained. In this embodiment, instead of the bellows 22 shown in FIG.
A bag member 32 is connected to the bag member 32 and is expandable and contractible in the shape of a hollow sphere within the separator. Due to the expansion and contraction action of this bag member 32, the work side airtight chamber 2
3 and the vacuum pump side airtight chamber 24 are completely isolated, the workpiece 11 can be evacuated,
It is possible to prevent the performance of the vacuum pump 29 from deteriorating and also to prevent the packing member from deteriorating.

Further, FIG. 4 shows a third embodiment of the present invention, parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and only the characteristic structure thereof will be explained. In FIG. 4, a membrane member 33 is stretched within the separator 14 to substantially divide the interior of the chamber into two. This membrane member 3
3 separates and partitions the interior of the separator 14 into a work-side airtight chamber 23 containing the work-side suction/discharge port 16 and a vacuum pump-side airtight chamber 24 containing the vacuum pump-side suction/discharge port 19; The workpiece side airtight chamber 23 and the vacuum pump side airtight chamber 23 are configured to be freely displaceable so as to expand or contract in response to changes in the relative atmospheric pressure between the workpiece side airtight chamber 23 and the vacuum pump side airtight chamber 24 . The liquid returned to the liquid tank is collected only in the work-side airtight chamber 23.

Such a membrane member 33 is deformed so as to be pulled toward the vacuum pump side during evacuation, and can lower the air pressure in the work-side airtight chamber 23 to evacuate the work 11, and is completely pulled toward the vacuum pump side. When the outside air is supplied to the airtight chamber 24 on the vacuum pump side, the workpiece 11 is deformed so as to be pulled toward the workpiece side, and the workpiece 11 can be evacuated many times. Further, since unnecessary liquid does not accumulate in the workpiece-side hermetic chamber 23 and vapor generated by this liquid is not sucked into the vacuum pump-side hermetic chamber 24, it is possible to prevent the performance of the vacuum pump 29 from deteriorating.

It should be noted that each embodiment has been explained using the simplest configuration, and the shape of each member may be further modified.The important point is that the gas is completely separated between the workpiece side and the vacuum pump side. It is characterized by:

[Effects of the invention] As described above, according to the invention, in a vacuum evacuation device in which a separator for gas-liquid separation is provided between a workpiece and a vacuum pump, a workpiece side and a vacuum pump side are connected in the separator. Since the isolation member that can be expanded and contracted to separate and partition the workpiece is provided, the vapor from the liquid adhering to the workpiece side is not sucked into the vacuum pump, and the vacuum pump connection gasket and vacuum pump chamber wall members are prevented from chemical change. It has the effect of preventing damage. Therefore, there is no need to select the vacuum pump and the connecting gasket depending on the type of liquid to be filled, and there is an advantage that the performance of the vacuum pump etc. is not deteriorated.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional vacuum evacuation device, Fig. 2 is a block diagram showing a first embodiment of the present invention, Fig. 3 is a block diagram showing a second embodiment of the present invention, and Fig. 4 is a block diagram showing a second embodiment of the present invention. It is a block diagram which shows the 3rd Example of this invention. 11... Work, 12, 15, 25, 28...
Connection pipe, 13, 26, 27... Control valve, 14...
Separator, 16... Work side intake/discharge port, 19...
...Vacuum pump side suction/exhaust port, 20...Opening, 21
... Base, 22 ... Bellows, 23 ... Work side airtight chamber, 24 ... Vacuum pump side airtight chamber, 29 ...
Vacuum pump, 32... bag member, 33... membrane member.

Claims (1)

[Claims for Utility Model Registration] (1) In a device in which a workpiece and a vacuum pump side are connected via a separator for gas-liquid separation, and the workpiece is evacuated via the separator, the inside of the separator is connected to a vacuum pump side chamber. An isolating member that separates and partitions the workpiece into a side chamber and a workpiece side chamber, and that expands and contracts the respective volumes of these chambers inversely proportionally, is disposed within the separator, and the workpiece and the vacuum pump are disconnected from each other. A vacuum device characterized by vacuuming. (2) The vacuum evacuation device according to claim 1, wherein the isolation member is a bellows. (3) The vacuum evacuation device according to claim 1, wherein the isolation member is a bag member that can be expanded and contracted in the shape of a hollow sphere within the separator. (4) The vacuum evacuation device according to claim 1, wherein a membrane member is used as the isolation member.