JPH02155563A - Continuous type vacuum brazing device - Google Patents

Abstract

PURPOSE:To eliminate the pollution due to org. solvents and to prevent the contamination from a vacuum brazing furnace having heaters in the furnace and brazing defect by connecting the vacuum brazing furnace via a shut off sluice valve. CONSTITUTION:The shut off sluice valve 6 is closed and an inlet sluice valve 4 of a degreasing chamber 1 is opened to insert the objects to be treated into the degreasing chamber 1. The inlet sluice valve 4 is closed and the inside of the degreasing chamber 1 is evacuated to a vacuum by a vacuum discharge route 3 after the insertion. While the evacuation is continued, a carrier gas is introduced from a carrier gas introducing route 2 into the degreasing chamber 1 and the objects to be treated are heated for the specified period of time by the heaters 5. The oil sticking to the objects to be treated evaporate when the objects are heated under the reduced pressure. The vapor of the oil is discharged together with the carrier gas from the degreasing chamber 1 and is trapped by an oil trap 3b in the discharge route 3. The shut off sluice valve 6 is thereafter opened and the degreased objects are sent into the vacuum brazing furnace 7 where the objects are brazed under heating by the heaters 11.

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a continuous vacuum brazing apparatus.

(Conventional technology) Workpieces that are assembled and fixed to jigs after being processed by pressing, cutting, etc., are inserted into a vacuum brazing furnace, as ura will adhere to them during processing. Before proceeding with brazing, adhering oil must be removed.

Therefore, the first example of the conventional vacuum brazing apparatus is equipped with a vacuum brazing furnace independently, and cleaning process equipment for cleaning the oil applied to the workpiece with a batter solvent to remove 7TIJ. It was installed separately from the vacuum brazing furnace.

In the second example, M+ attached to the object to be processed was heated in a vacuum.

(Category report to be solved by the invention) As mentioned above, the first example of a conventional continuous vacuum brazing apparatus uses an organic solvent to clean oil adhering to the workpiece separately from the vacuum brazing furnace. Cleaning process equipment was installed to deoil the oil, but if left as is, pollution would be caused by the solvent.

As a result, pollution prevention equipment was additionally required, and equipment costs were considerable. In addition, installation space for cleaning process equipment and operating personnel are required, which poses an obstacle to reducing running costs. Moreover, since it is not possible to sufficiently degrease a workpiece with a complex shape such as a heat exchanger, if such a workpiece is inserted into a vacuum brazing furnace, it may contaminate the vacuum brazing furnace and the brazing may be defective. There were problems such as the occurrence of

In addition, in the second example, simply heating the workpiece in a vacuum takes a long time for the oils and fats to separate from the workpiece, and the separated oils and fats reach the vacuum pump and become pump oil. There is a problem that if it gets mixed in, the performance of the vacuum pump will be significantly deteriorated.

This invention solves the above-mentioned conventional problems, eliminates pollution caused by solvents, saves installation space, reduces the number of operating personnel, and eliminates contamination of vacuum brazing furnaces and poor brazing. It is an object of the present invention to provide a continuous vacuum brazing device that prevents the above problems, shortens the heating time, and does not deteriorate the performance of the vacuum pump.

(Means for Solving the Problems) In order to achieve the object L, the continuous vacuum brazing apparatus of the present invention includes a carrier gas introduction path and a vacuum exhaust path having an oil trap in the path. At least one degreasing chamber equipped with a heater inside the chamber is provided with a gate valve, and a carrier gas introduction path and a vacuum exhaust path are also connected to the furnace wall. It is characterized in that an outlet gate valve is provided at the outlet, and it is connected to a vacuum brazing furnace equipped with a heater inside the furnace via a shutoff gate valve.

The entrance of the degreasing chamber may be connected to at least one preparation chamber with a vacuum exhaust path connected to the chamber wall via the entrance gate valve of the degreasing chamber. At least one extraction chamber having a vacuum exhaust path connected to the chamber wall may be connected to the outlet of the furnace via an outlet gate valve of the vacuum brazing furnace.

(Function) In this invention, the inlet gate valve of the degreasing chamber is opened, a workpiece (not shown) is inserted into the degreasing chamber, the inlet gate valve is closed, and the degreasing chamber is evacuated through the vacuum exhaust path. Then, while continuing vacuum evacuation, carrier gas is introduced into the degreasing chamber from the carrier gas introduction path, and when the object to be processed is heated for a certain period of time in heating 2, the oil attached to the object to be processed evaporates.
It is exhausted from the degreasing chamber along with the carrier gas, and is trapped in an oil trap in the vacuum exhaust path. Thereafter, the shutoff gate valve is opened and the workpiece is sent to the vacuum brazing furnace. At this time, when the vacuum exhaust path of the vacuum brazing furnace is closed and a carrier gas is introduced into the vacuum brazing furnace, the carrier gas flows from the vacuum brazing furnace to the degreasing chamber, and
It is evacuated through the vacuum exhaust path of the degreasing chamber, thereby preventing contamination of the ura in the vacuum brazing furnace. After sending the workpiece to the vacuum brazing furnace, close the shutoff gate valve, and
When the workpiece is heated with a heater while the vacuum brazing furnace is evacuated, the workpiece becomes brazed.

In addition, when the preparation room is connected to the entrance of the degreasing chamber, the preparation chamber is evacuated after putting the object to be processed into the preparation chamber, and after the preparation chamber is evacuated, the object to be processed is transferred to the preparation chamber. Insert into the degreasing chamber. In addition, when the take-out chamber is connected to the outlet of the vacuum brazing furnace, the take-out chamber is evacuated, the workpiece is inserted into the take-out chamber from the vacuum brazing furnace, and after the insertion, the take-out chamber is is returned to atmospheric pressure and the object to be processed is taken out from the removal 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 which a carrier gas introduction path 2 and a vacuum evacuation path 3 are connected to a chamber wall 1a of a degreasing chamber 1, and a carrier gas introduction path 2 is connected to a vacuum exhaust path 3. is provided with a valve 2a, and the vacuum exhaust path 3 is provided with a valve 3a and an oil trap 3b.

Further, an inlet gate valve 4 is provided at the entrance of the degreasing chamber I, and a heater 5 is provided inside the degreasing chamber 1.
A vacuum brazing furnace 7 is connected to the outlet of the de-finger palm l via a shutoff gate valve 6. A carrier gas introduction path 8 and a vacuum evacuation path 9 are connected to the furnace wall 7a of the vacuum brazing furnace 7, and a valve 8a is provided in the carrier gas introduction path 8, is provided with a valve 9a. In addition, an outlet gate valve 1 is provided at the outlet of the vacuum brazing furnace 7.
0 is provided, and a heater 11 is provided inside the vacuum brazing furnace 8.

Therefore, when degreasing a workpiece covered with oil using the above-mentioned apparatus, the shutoff gate valve 6 is closed.
Open the inlet gate valve 4 of the degreasing chamber l and remove the object to be treated (not shown).
Insert into the degreasing chamber l. After insertion, close the inlet gate valve 4,
The degreasing chamber 1 is evacuated through the evacuation route 3, and while continuing the evacuation, a carrier gas is introduced into the degreasing chamber 1 through the carrier gas introduction route 2, and the object to be processed is heated for a certain period of time with the heater 5. 2. When the object to be processed is heated under reduced pressure, the oil adhering to the object to be processed evaporates and is exhausted together with the carrier gas from the degreasing chamber 1.
The oil is trapped in the oil trap 3b inside.

Thereafter, the shutoff gate valve 6 is opened, and the degreased workpiece that has adhered thereto is sent from the degreasing chamber 1 to the vacuum brazing furnace 7. At this time, when the valve 9a in the vacuum exhaust path 9 of the vacuum brazing furnace 7 is closed and the valve 9a in the carrier gas introduction path 9 is opened to introduce the carrier gas into the vacuum brazing furnace 7,
The carrier gas flows from the vacuum brazing furnace 7 to the degreasing chamber 1, and is exhausted through the vacuum exhaust path 3. Therefore, oil contamination in the vacuum brazing furnace 7 is prevented. After the workpiece is sent to the vacuum brazing furnace 8, the shutoff gate valve 6 is closed, the valve 9a in the evacuation path 9 is opened, and the workpiece is brazed while being heated by the heater 11.

In the above embodiment, the degreasing chamber 1 and the vacuum brazing furnace 7 are connected, but the present invention is not limited to this, and as shown in FIG. The extraction chamber 21 may be connected to the outlet side via an outlet gate valve IO.

In FIG. 2, 22 is a vacuum exhaust path, 22a is a valve, 2
3 is an outlet gate valve. Further, as shown in FIG. 3, another degreasing chamber 31 may be connected to the entrance side of the degreasing chamber I. In FIG. 3, 32 is a vacuum exhaust path, 32a is a valve, 32b is an oil trap, 33 is a carrier gas introduction path, 33a is a valve, 34 is a heater, and 35 is an inlet gate valve. Furthermore, as shown in FIG. 4, a preparation chamber 4I may be connected to the entrance side of the degreasing chamber 1 via an inlet gate valve 4.

By connecting the preparation chambers 41, the degreasing chamber 1 can be constantly kept at a reduced pressure by evacuating the preparation chamber 41 or returning it to atmospheric pressure, thereby improving the processing efficiency of the objects to be processed. Become. In FIG. 4, 42 is a vacuum exhaust path, 42a is a valve, and 43 is an inlet gate valve. Furthermore, as shown in Fig. 5, there is another one on the entrance side of the degreasing chamber l.
Two degreasing chambers 31 are connected, and a take-out chamber 21 is connected to the outlet side of the vacuum brazing furnace 7. As a result, the pressure in the vacuum brazing furnace 7 can be kept reduced at all times, and the processing efficiency of the workpiece can be improved.In FIG.
32 is a valve, 32b is an oil trap, 33 is a carrier gas introduction path, 33a is a valve, 34 is a heater, 35 is an inlet gate valve, 22 is a vacuum exhaust path, 22a is a valve, and 23 is an outlet gate valve. Further, as shown in FIG. 6, the preparation chamber 41 may be connected to the entrance side of the degreasing chamber 1, and the extraction chamber 21 may be connected to the exit side of the vacuum brazing furnace 7. If the preparation chamber 41 and the extraction chamber 21 are connected, the preparation chamber 41 and the extraction chamber 21 can be evacuated or returned to atmospheric pressure, and the degreasing chamber 1 and the vacuum brazing furnace 7 can be connected.
can be kept under reduced pressure at all times, making it possible to improve the processing efficiency of the objects to be processed. In FIG. 6, 42 is an evacuation route, 42a is a valve f, 43 is an inlet gate valve, 22 is an evacuation route, 22a is a valve, and 23 is an outlet gate valve. Historically, as shown in Figure 7, the degreasing chamber l
Another degreasing chamber 31 and the preparation chamber 41 may be connected to the inlet side of the vacuum brazing furnace 7, and the extraction chamber 21 may be connected to the outlet side of the vacuum brazing furnace 7. In FIG. 7, 32 is a vacuum exhaust path, 12a is a valve, 32b is an oil trap, 33 is a carrier gas introduction path, 33a is a valve, 34 is a heater, 35 is an inlet gate valve,
42 is an evacuation route, 42a is a valve, 43 is an inlet gate valve, 22 is an evacuation route, 22a is a valve, and 23 is an outlet gate valve.

(Effects of the Invention) Since the present invention has the above-described configuration, there is no pollution caused by organic solvents, the installation space is saved, the number of operating personnel in the cleaning process can be reduced, and the vacuum brazing furnace can be used. Contamination and brazing can prevent defects, and since preheating energy is used to degrease, energy is saved and running costs are reduced overall. It has the effect of not degrading the performance of the vacuum pump.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. FIG. 3, FIG. 4, FIG. 5, FIG. 6, and FIG. 7 are explanatory diagrams showing other embodiments of the present invention. In the figure, 1, ae, 2, 3, 3b, 5, 6, 7, 8, 9, 10, 11, 21, 22# 31, 32, 2b 33, 34, 41...? ! Preparation room 42... Vacuum exhaust route In the drawings, the same reference numerals indicate the same or corresponding parts. Patent applicant: Japan Vacuum Technology Co., Ltd. Degreasing chamber Chamber wall Carrier gas introduction route Vacuum exhaust route Oil trap inlet gate valve Heater shutoff gate valve Vacuum brazing furnace Carrier gas introduction route Vacuum exhaust route Outlet gate valve Heater Take-out chamber Vacuum exhaust route Degreasing chamber Vacuum exhaust route Oil trap Carrier gas introduction route Heater Fig. 1 Fig. 2 Fig. 3 Fig. 6 Fig. 7 Fig. 4 Procedure amendment (method) % formula % Name of invention Continuous vacuum brazing Device 3, relationship with the case of the person making the amendment Patent applicant address: 2500 Hagizono, Chigasaki City, Kanagawa Prefecture Name: Japan Vacuum Technology Co., Ltd. Representative Jinpei Takamura:゛<P;4. ] Date of the amendment order March 28, 1999 (all sending dates) Column "Brief explanation of drawings" of the specification subject to amendment Contents of the amendment [Figure 3] on page 11, line 18 of the specification Figure 2, add J. To the Moe of ゛

Claims (1)

[Claims] 1. A carrier gas introduction path and a vacuum exhaust path having an oil trap in the path are connected to the chamber wall, an inlet gate valve is provided at the chamber entrance, and a heater is provided inside the chamber. at least 1
The two or more degreasing chambers are connected to the furnace wall with a carrier gas introduction path and a vacuum exhaust path, and an outlet gate valve is installed at the furnace outlet to isolate the vacuum brazing furnace equipped with a heater inside the furnace. A continuous vacuum brazing device characterized by being connected via a valve. 2. The continuous vacuum according to claim 1, characterized in that at least one preparation chamber having a vacuum exhaust path connected to the chamber wall is connected to the entrance of the degreasing chamber via an inlet gate valve of the degreasing chamber. Brazing equipment. 3. At least one extraction chamber having a vacuum exhaust path connected to the chamber wall is connected to the outlet of the vacuum brazing furnace via an outlet gate valve of the vacuum brazing furnace. 2. The continuous vacuum brazing apparatus according to 2.