JP2686798B2 - Continuous vacuum brazing device - Google Patents

Description

The present invention relates to a continuous vacuum brazing apparatus.

(Prior art) The object to be processed, which is assembled and fixed to the jig after the material is pressed, cut, etc., has oil adhering during processing, so insert it into a vacuum brazing furnace. The applied oil must be degreased before brazing.

Therefore, the first example of the conventional vacuum brazing apparatus is that a vacuum brazing furnace is separately provided, and the cleaning process equipment for cleaning the oil adhering to the object to be processed with an organic solvent to remove oil is used as the vacuum brazing apparatus. It was provided separately from the furnace.

Further, in the second example, the oil adhering to the object to be treated is independently heated in vacuum.

(Problem to be Solved by the Invention) A first example of a conventional continuous vacuum brazing apparatus is to wash oil adhered to an object with an organic solvent separately from the vacuum brazing furnace as described above. Since there was a cleaning process facility that deoils the oil, pollution with organic solvents would occur as it is. Therefore, pollution control equipment was required incidentally, and the equipment cost was considerably high. In addition, the installation space for the cleaning process equipment and operating personnel are required, which has been an obstacle to reducing the running cost. Moreover, since a workpiece having a complicated shape such as a heat exchanger cannot be sufficiently degreased, if such a workpiece is inserted into a vacuum brazing furnace, contamination of the vacuum brazing furnace and defective brazing will occur. There was a problem such as occurrence.

In the second example, it takes a long time for oils and fats to separate from the object to be processed only by heating the object to be processed in a vacuum, and the separated oils and fats reach the vacuum pump to pump oil. If it is mixed in with, there is a problem that the performance of the vacuum pump is significantly deteriorated.

The present invention solves the above-mentioned conventional problems, does not cause pollution by organic solvents, saves installation space, reduces the number of operating workers, and prevents contamination and defective brazing of a vacuum brazing furnace. In addition, it is an object of the present invention to provide a continuous vacuum brazing device that shortens the heating time and does not deteriorate the performance of the vacuum pump.

(Means for Solving the Problem) In order to achieve the above object, in the continuous vacuum brazing apparatus of the present invention, a carrier gas introduction path and a vacuum exhaust path having an oil trap in the path are connected to a chamber wall. Then, an inlet sluice valve is provided at the chamber inlet, at least one degreasing chamber having a heater inside the chamber, and a carrier gas introduction path and a vacuum exhaust path are also connected to the chamber wall and the heater inside the room. Vacuum brazing in which at least one or more preheating chambers provided with are connected through a first shut-off sluice valve, and the preheating chamber is connected to the furnace wall with a carrier gas introduction path and a vacuum exhaust path. It is characterized in that it is connected to the furnace via a second shut-off gate valve.

It should be noted that at least one or more preparation chambers having a vacuum exhaust path connected to the chamber wall may be connected to the inlet of the degreasing chamber via an inlet gate valve of the degreasing chamber. Further, at least one or more extraction chambers whose vacuum exhaust path is connected to the chamber wall may be connected to the outlet of the vacuum brazing furnace through an outlet sluice valve of the vacuum brazing furnace.

(Operation) In the present invention, the inlet sluice valve of the degreasing chamber is opened, the object to be treated (not shown) is inserted into the degreasing chamber, the inlet sluice valve is closed, and the degreasing chamber is evacuated by the vacuum exhaust path. And
While continuing vacuum evacuation, introducing the carrier gas into the degreasing chamber from the carrier gas introduction path and heating the object to be processed for a certain period of time with the heater, the oil adhering to the object to be evaporated evaporates,
The carrier gas is exhausted from the degreasing chamber and is trapped by an oil trap in the vacuum exhaust path. After that, the first shut-off gate valve is opened, the vacuum exhaust path of the preheating chamber is closed, and while the carrier gas is introduced from the preheating chamber, the object to be processed is sent to the preheating chamber, and the first shut-off gate valve is opened. It is closed and evacuated, whereupon the work piece is heated with a heater.
After heating the object to be processed in the preheating chamber, the second shut-off sluice valve is opened, the vacuum exhaust path of the preheating chamber is opened, and the vacuum exhaust path of the vacuum brazing furnace is closed, and the vacuum brazing furnace is in progress. While introducing the carrier gas into the chamber, the object to be treated is sent from the preheating chamber to the vacuum brazing furnace. At this time, the carrier gas introduced into the vacuum brazing furnace flows from the vacuum brazing furnace to the preheating chamber, and is exhausted through the vacuum exhaust path of the preheating chamber to contaminate the oil in the vacuum brazing furnace. Will be prevented. After sending the work to the vacuum brazing furnace, close the shut-off sluice valve, and heat the work with a heater while evacuating the vacuum brazing furnace, the work will be brazed. become.

When the preparation chamber is connected to the inlet of the degreasing chamber, the object to be treated is put into the preparation chamber, and then the preparation chamber is evacuated, and after the chamber is evacuated, the object to be treated is removed from the preparation chamber. Insert into the degreasing chamber. If the outlet of the vacuum brazing furnace is connected to the outlet of the vacuum brazing furnace, the outlet chamber should be evacuated, the object to be processed should be inserted into the outlet of the vacuum brazing furnace, and after the insertion, the outlet should be removed. Is returned to atmospheric pressure, and the object to be processed is taken out from the extraction chamber.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In FIG. 1, a carrier gas introduction path 2 and a vacuum exhaust path 3 are connected to a chamber wall 1a of a degreasing chamber 1, and a carrier gas introduction path 2 Is provided with a valve 2a, and a valve 3a and an oil trap 3b are provided in the vacuum exhaust path 3. Also,
An inlet sluice valve 4 is provided at the entrance of the degreasing chamber 1,
A heater 5 is provided inside the. Furthermore, the degreasing chamber 1
The pre-heating chamber 7 is connected to the outlet of the through a shut-off sluice valve 6. A carrier gas introduction path 8 and a vacuum exhaust path 9 are connected to a chamber wall 7a of the preheating chamber 7, a valve 8a is provided in the path of the carrier gas introduction path 8, and a vacuum exhaust path 9 is provided in the path of the vacuum exhaust path 9. A valve 9a is provided. Preheating chamber 7
A heater 10 is provided inside. A vacuum brazing furnace 12 is connected to the outlet of the preheating chamber 7 via a shutoff sluice valve 11. A carrier gas introduction path 13 and a vacuum exhaust path 14 are connected to the furnace wall 12a of the vacuum brazing furnace 12, a valve 13a is provided in the path of the carrier gas introduction path 13, and a vacuum exhaust path 14 is provided in the path. Is provided with a valve 14a. Further, an outlet sluice valve 15 is provided at the outlet of the vacuum brazing furnace 12, and a heater 16 is provided inside the vacuum brazing furnace 12.

Therefore, when degreasing an object to be treated with oil using the apparatus as described above, the shut-off sluice valve 6 is closed, the inlet sluice valve 4 of the degreasing chamber 1 is opened, and the object to be treated (not shown) is shown. No.) is inserted into the degreasing chamber 1. After the insertion, the inlet sluice valve 4 is closed, the degreasing chamber 1 is evacuated through the vacuum exhaust path 3, and
While evacuation is continued, the carrier gas is introduced into the degreasing chamber 1 through the carrier gas introduction path 2 and the object to be treated is heated by the heater 5 for a certain period of time. When the object to be processed is heated under reduced pressure, the oil attached to the object to be processed evaporates, is exhausted from the degreasing chamber 1 together with the carrier gas, and is trapped by the oil trap 3b in the vacuum exhaust path 3. . After that, the shut-off sluice valve 6 is opened, and the degreased object to be treated that has adhered oil is sent from the degreasing chamber 1 to the preheating chamber 7.
At this time, when the valve 9a in the vacuum exhaust path 9 of the preheating chamber 7 is closed and the valve 8a in the carrier gas introduction path 8 is opened to introduce the carrier gas into the preheating chamber 7, the carrier gas is It flows from the heating chamber 7 to the degreasing chamber 1 and is exhausted through the vacuum exhaust path 3. Therefore, the evaporation of the oil attached to the object to be processed does not flow from the degreasing chamber 1 to the preheating chamber 7. After the object to be processed is sent to the preheating chamber 7, the shut-off sluice valve 6 is closed, the valve 9a in the vacuum exhaust path 9 is opened, and the heater 10 heats it. After heating the object to be processed in the preheating chamber 7, the second shutoff sluice valve 11 is opened and the vacuum brazing furnace is opened.
The valve 14a in the vacuum evacuation path 14 of 12 is closed, and the valve 13a in the carrier gas introduction path 13 is opened to introduce the carrier gas into the vacuum brazing furnace 12 while vacuuming the workpiece from the preheating chamber 7. Send to the brazing furnace 12. At this time, the carrier gas introduced into the vacuum brazing furnace 12 flows from the vacuum brazing furnace 12 into the preheating chamber 7 and is exhausted through the vacuum exhaust path 9 of the preheating chamber 7 to be vacuum brazed. Oil contamination in the furnace 12 is prevented. After sending the workpiece to the vacuum brazing furnace 12, the shut-off sluice valve 11 is closed, and the vacuum exhaust path
The object to be treated is brazed by heating the object to be treated with the heater 16 while opening the valve 14a in 14 and evacuating the vacuum brazing furnace 12.

In the above embodiment, the preheating chamber 7 and the vacuum brazing furnace 12 are sequentially connected to the degreasing chamber 1, but the degreasing chamber 1 is not limited to this, and as shown in FIG. The preparation chamber 21 may be connected to the inlet side of the chamber 1 via the inlet gate valve 4. When the preparation chamber 21 is connected, the degreasing chamber 1 can be constantly depressurized by returning the preparation chamber 21 to vacuum exhaust or returning to atmospheric pressure, so that the processing efficiency of the object to be processed can be improved. Become. In FIG. 2, 22 is a vacuum exhaust path, 22a is a valve, and 23 is an inlet gate valve. Further, as shown in FIG. 3, an extraction chamber 31 is provided on the outlet side of the vacuum brazing furnace 12,
It may be connected through the outlet sluice valve 15. When the extraction chamber 31 is connected, the vacuum brazing furnace 12 can be constantly depressurized by returning the extraction chamber 31 to vacuum exhaust or to atmospheric pressure, and the processing efficiency of the object to be processed can be improved. Like In FIG. 3, 32 is a vacuum exhaust path, 32a is a valve, and 33 is an outlet sluice valve. Further, as shown in FIG. 4, the preparation chamber 21 may be connected to the inlet side of the degreasing chamber 1 and the extraction chamber 31 may be connected to the outlet side of the vacuum brazing furnace 12. If the preparation chamber 21 and the extraction chamber 31 are connected to each other, the degreasing chamber 1 and the vacuum brazing furnace 12 can be constantly depressurized by returning the preparation chamber 21 and the extraction chamber 31 to vacuum exhaust or atmospheric pressure. Therefore, the processing efficiency of the object to be processed can be improved. In FIG. 4, 22 is a vacuum exhaust path, 22a is a valve, 23 is an inlet gate valve, 32 is a vacuum exhaust path, 32a is a valve, and 33 is an outlet gate valve. Furthermore, as shown in FIG. 5, another degreasing chamber 51 may be connected to the inlet of the degreasing chamber 1 and an outlet chamber 31 may be connected to the outlet side of the vacuum brazing furnace 12. In FIG. 5, 52 is a vacuum exhaust path, 52a is a valve, 52b is an oil trap, 53 is a carrier gas introduction path, 53a is a valve, 54 is a heater, and 55 is an inlet gate valve. Further, as shown in FIG. 6, another degreasing chamber 51 and the preparation chamber 21 may be connected to the inlet side of the degreasing chamber 1, and the extraction chamber 31 may be connected to the outlet side of the vacuum brazing furnace 12. Further, as shown in FIG. 7, another degreasing chamber 51 is connected to the inlet side of the degreasing chamber 1 to make two preheating chambers,
The extraction chamber 31 may be connected to the outlet side of the vacuum brazing furnace 12.
In FIG. 7, 71 is a preheating chamber, 72 is a vacuum exhaust path,
72a is a valve, 73 is a carrier gas introduction path, 73a is a valve, 74 is an inlet gate valve, and 75 is a heater. Furthermore, as shown in FIG. 8, even if the preparation chamber 21 is connected to the inlet side of the degreasing chamber 1, two preheating chambers are provided, and the extraction chamber 31 is connected to the outlet side of the vacuum brazing furnace 12. Good. Further, as shown in FIG. 9, the degreasing chamber 1
The preparation room 21 is connected to the entrance side of the
The two extraction chambers 31 may be connected to the outlet side of the vacuum brazing furnace 12. In addition, as shown in FIG. 10, another degreasing chamber 51 and a preparation chamber 21 are connected to the inlet side of the degreasing chamber 1, and two extraction chambers 31 are connected to the outlet side of the vacuum brazing furnace 12. Good.

(Effect of the invention) As described above, according to the present invention, the degreasing chamber and the preheating chamber vacuum brazing furnace are connected in this order, and the preheating chamber is provided between the degreasing chamber and the vacuum brazing furnace. The oil vaporized in the chamber never flows into the vacuum brazing furnace, which prevents contamination of the vacuum brazing furnace and poor brazing. That is, the vacuum brazing furnace is not contaminated even if it is operated for a long time. Further, since it is heated in the preheating chamber before being brazed in the vacuum brazing furnace, the heating time in the vacuum brazing furnace can be shortened and the performance of the vacuum pump is not deteriorated. It is possible to reduce the burden on the heater and improve the processing efficiency of the object to be processed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention. Second
Figure 3, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, and Figure 8
FIGS. 9, 9 and 10 are explanatory views showing other embodiments of the present invention. In the figure, 1 ... Degreasing chamber 1a ... Chamber wall 2 ... Carrier gas introduction path 3 ... Vacuum exhaust path 3b ... Oil trap 4 ... Inlet gate valve 5 ... Heater 6 ... Shut-off valve 7 ... … Pre-heating chamber 7a …… Chamber wall 8 …… Carrier gas introduction path 9 …… Vacuum exhaust path 10 …… Heater 12 …… Vacuum brazing furnace 13 …… Carrier gas introduction path 14 …… Vacuum exhaust path 15 …… Outlet sluice valve 16 …… Heater 21 …… Preparation room 22 …… Vacuum exhaust path 31 …… Ejection room 32 …… Vacuum exhaust path 71 …… Preheating chamber 72 …… Vacuum exhaust path 73 …… Carrier gas introduction path In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

(57) [Claims] 1. At least one or more of a chamber wall which is connected to a carrier gas introduction path and a vacuum exhaust path having an oil trap in the path, an inlet sluice valve is provided at the chamber inlet, and a heater is provided inside the chamber. The degreasing chamber and the carrier gas introduction path and the vacuum exhaust path are also connected to the chamber wall, and at least one preheating chamber provided with a heater inside the chamber is connected via the first shut-off gate valve. In addition, the preheating chamber and a vacuum brazing furnace in which a carrier gas introduction path and a vacuum exhaust path are connected to the furnace wall are connected via a second shut-off sluice valve. Attached device. 2. The inlet of the degreasing chamber is connected to at least one preparatory chamber having a vacuum exhaust path connected to the chamber wall via an inlet gate valve of the degreasing chamber. Continuous vacuum brazing equipment. 3. The outlet of the vacuum brazing furnace is connected to at least one or more extraction chambers whose vacuum exhaust path is connected to a chamber wall via an outlet sluice valve of the vacuum brazing furnace. The continuous vacuum brazing apparatus according to claim 1 or 2.