JPH074790A - Air purge equipment used in soldering of refrigerant pipe for cooling apparatus - Google Patents

Abstract

PURPOSE:To enable efficient execution of air purge by one operator while economizing on a nitrogen gas, at the time of an operation of soldering a refrigerant pipe. CONSTITUTION:A nozzle 10 for joining to a refrigerant pipe 1 a nitrogen gas conduit 4 extended from a nitrogen gas cylinder 3 is provided with sheath pipes 14, 15, 16 and 17 for multistage fit and a solenoid valve 18 is fitted to the conduit 4. Thereby operations of air purge and soldering can be executed by one person by a remote control of the solenoid valve 18 by controlling a solenoid valve control device 19 at a place of the soldering. The refrigerant pipe 1 is inserted and fitted in one of the sheath pipes 14, 15, 16 and 17 of the nozzle 10 fitted to the fore end of the nitrogen gas conduit 4, of which the outside diameter is just fit for it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purge device used for brazing a refrigerant pipe connecting an outdoor unit and an indoor unit of a cooling device.

[0002]

2. Description of the Related Art In an air conditioner, an outdoor unit and an indoor unit (radiator) are connected by a refrigerant pipe for circulating a refrigerant, and a copper tube is used for this refrigerant pipe. Normally, one refrigerant pipe is used as an extension, but if cracks or binholes etc. occur over the course of time, cut this part and add a new pipe, or Brazing of repair plates is performed.

When oxygen is left in the refrigerant pipe during this repair, the heat generated during brazing produces oxides in the pipe, which causes troubles. Therefore, the refrigerant pipe is replaced with nitrogen gas. Brazing is performed after (air purging).

FIG. 3 shows a conventional air purging device. 1 is a copper tube, 2 is a repair point, 3 is a nitrogen gas cylinder, 4 is a nitrogen gas conduit, and this nitrogen gas conduit 4
As shown in FIG. 4, a nozzle 5 having a tapered fitting outer diameter 5'is attached to the tip of the nozzle so as to fit a refrigerant pipe of any diameter. The tape 6 is wrapped around and fixed to the end of the nozzle 2, and the air purge is controlled using a manual valve 7 attached to the inlet side of the nozzle 5. In the figure, 8 is a pressure gauge and 9 is a flow meter.

[0005]

However, the above-mentioned conventional example has the following drawbacks.

A. Since the nozzle 5 has a tapered shape, there are few fitting surfaces and it becomes unstable. For this reason, the tape 6 is used for fixing, but it is still unstable in many cases, and gas leakage may occur from here, or air may be sucked.

B. Since the outdoor unit and the indoor unit are usually distant from each other, the personnel who operate the air purge valve 7
It is necessary to perform the work with two brazing personnel.

An object of the present invention is to eliminate the above-mentioned drawbacks a and b in an air purge apparatus.

[0009]

The constitution of the present invention is as follows.

1. A nozzle formed by forming a multi-staged sheath tube having an inner diameter that matches the outer diameter portion of the diameter of the refrigerant pipe and penetrating the nitrogen gas ejection port in the center, and forming a nitrogen gas conduit connection port on the rear surface, A nitrogen gas supply device connected to the nitrogen gas conduit connection port of the nozzle via a nitrogen gas conduit with a solenoid valve, and a solenoid valve control device for remotely controlling the solenoid valve attached to the nitrogen gas conduit. An air purge device used for brazing a refrigerant pipe for a cooling device.

The remote control of the solenoid valve is performed by wire or wirelessly.

2. In a refrigerant pipe formed by forming a multi-staged sheath pipe having an inner diameter that matches the outer diameter portion of the refrigerant pipe and penetrating a nitrogen gas ejection port in the center and forming a nitrogen gas conduit connection port on the rear surface. A nozzle for supplying nitrogen gas.

[0013]

[Operation] On site, select the nozzle fitting sheath tube according to the diameter of the refrigerant tube (copper tube), fit the refrigerant tube there, and attach the tape to the outside of the sheath tube and the refrigerant tube if necessary. Roll and fix. Next, the worker moves to the repaired place, performs the air purge while controlling the solenoid valve using the solenoid valve control device, and then proceeds to the brazing work.

[0014]

EXAMPLE FIG. 1 shows an example of air purging using the apparatus of the present invention. 1 is a refrigerant pipe, 2 is a repairing part (brazing part), 3 is a nitrogen gas cylinder, 4 is a nitrogen gas pipe, 8 is a pressure gauge, 9 is a flow meter, and 10 is a nitrogen gas attached to the tip of the nitrogen gas pipe 4. The detailed structure of the supply nozzle is shown in FIG.

In FIG. 2, 11 is a nozzle body, 12 is a nitrogen gas supply port penetrating the center of the nozzle body 11, 13 is a nitrogen gas conduit connection port, 14, 15, 1
Reference numerals 6 and 17 denote fitting sheath tubes formed in multiple stages so as to match the outer diameter portion of the bore of the refrigerant tube 1.

Reference numeral 18 is a solenoid valve attached to the nitrogen gas conduit 4, and 19 is a solenoid valve control device for controlling the opening / closing of the solenoid valve 18. In the case of the embodiment, it is a wired type using a control line 20. is there. However, the solenoid valve 18 may be controlled wirelessly. In the case of the embodiment, the pressure gauge 8 and the flowmeter 9 are located on the nitrogen gas cylinder 3 side and separated from each other, but the solenoid valve control device 19 side may be configured to read the pressure and flow rate. Further, when the cylinder pressure drops below a certain level, a buzzer or the like may be used to notify the user, and the work may be prevented from being performed in a state where the air purge is insufficient.

Next, the operation of the above embodiment will be described. First, at the site, the nitrogen gas cylinder 3 is set, and the nitrogen gas cylinder 3 is connected to the nitrogen gas pipe 4
Of the fitting sheath pipes 14, 15, 16 and 17 of the nozzle 10 attached earlier, and is inserted and fitted into the sheath pipe 16 with which the outer diameter of the refrigerant pipe 1 matches. Further, if necessary, the tape pipe 6 is used to fix the refrigerant pipe 1 from above the sheath pipe 16, the solenoid valve control device 19 is operated to open the solenoid valve 18, and the nitrogen gas cylinder 3 → nitrogen gas conduit 4 → electromagnetic Valve 18 →
The nozzle 10 is supplied to the inside of the refrigerant pipe 1, and the inside of the refrigerant pipe 1 is replaced with nitrogen gas. Then, brazing work is performed. After the brazing work is completed, the solenoid valve control device 19 is operated to close the solenoid valve 18 and stop the nitrogen gas.

[0018]

As described above, the present invention provides a nozzle having a multi-staged sheath tube matching the outer diameter of the refrigerant tube, and
The solenoid valve control device is configured so that the supply of nitrogen gas can be remotely controlled. As a result, the following effects are achieved.

A. The fitting surface can be made large regardless of the diameter (outer diameter) of the refrigerant pipe. As a result,
Since the refrigerant pipe and nozzle are fitted tightly, there is no concern that air will be mixed in and nitrogen gas will leak during work, so high quality brazing can be performed and nitrogen gas can be saved. it can.

B. Since the solenoid valve can be remotely operated to perform air purging, the work efficiency is improved, and the number of personnel involved in brazing work is only one, and labor costs can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an air purge device according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a nozzle.

FIG. 3 is an explanatory view of a conventional air purging device.

FIG. 4 is an explanatory diagram showing a configuration of a conventional nozzle.

[Explanation of symbols]

 1 Refrigerant pipe 2 Repair place 3 Nitrogen gas cylinder 4 Nitrogen gas conduit 5 Nozzle (conventional product) 6 Tape 7 Manual valve 8 Pressure gauge 9 Flowmeter 10 Nozzle (this invention product) 11 Nozzle body 12 Nitrogen gas supply port 13 Nitrogen gas Conduit connection port 14, 15, 16, 17 Fitting sheath tube 18 Solenoid valve 19 Solenoid valve control device 20 Control line

Claims (4)

[Claims] 1. A multi-staged sheath tube having an inner diameter matching the outer diameter portion of the refrigerant tube is formed, a nitrogen gas ejection port is provided at the center, and a nitrogen gas conduit connection port is formed on the rear surface. And a nitrogen gas supply device connected to the nitrogen gas conduit connection port of the nozzle via a nitrogen gas conduit with an electromagnetic valve, and for remotely controlling the electromagnetic valve attached to the nitrogen gas conduit. An air purging device used when brazing a refrigerant pipe for a cooling device, including the electromagnetic valve control device of. 2. An air purge device used in brazing a refrigerant pipe for a cooling device according to claim 1, wherein the solenoid valve is configured to control the solenoid valve by wire. 3. The air purge device used in brazing a refrigerant pipe for a cooling device according to claim 1, wherein the solenoid valve is configured to wirelessly control the solenoid valve. 4. A multi-staged sheath tube having an inner diameter that matches the outer diameter portion of the refrigerant tube is formed, and a nitrogen gas ejection port is provided at the center, and a nitrogen gas conduit connection port is formed on the rear surface. A nozzle for supplying nitrogen gas into the refrigerant pipe.