JP2738491B2 - Air purge device used when brazing refrigerant pipes for cooling equipment - Google Patents

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 a cooling apparatus, an outdoor unit and an indoor unit (radiator) are connected by a refrigerant tube for circulating a refrigerant, and a copper tube is used for the refrigerant tube. Normally, a single refrigerant pipe is used by extending it. However, if cracks or binholes occur along the way, cut this part to add a new pipe, or For example, brazing of a patch for repair is performed.

[0003] During the repair, if oxygen remains in the refrigerant tube, heat during brazing generates oxides in the tube, which causes a trouble. Therefore, the inside of the refrigerant tube is replaced with nitrogen gas. (Air purge) and then brazing are performed.

FIG. 3 shows a conventional air purge device. 1 is a copper tube, 2 is a repair site, 3 is a nitrogen gas cylinder, and 4 is a nitrogen gas conduit.
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 end of the nozzle 2 is fitted with a tape 6 wound thereon and fixed, 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 conventional example has the following disadvantages.

A. Since the nozzle 5 is tapered, the fitting surface is small and unstable. For this reason, although it is fixed with the tape 6, it is still unstable in many cases, and gas leakage may occur therefrom, or air may be sucked in.

B. Since the distance between the outdoor unit and the indoor unit is usually large, a person operating the air purge valve 7 includes:
The work needs to be performed by two brazing personnel.

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

[0009]

The configuration of the present invention is as follows.

[0010] 1. A nozzle formed by forming a sheath tube having an inner diameter matching the outer diameter portion of the refrigerant tube in multiple stages and providing a nitrogen gas ejection port at the center and forming a nitrogen gas conduit connection port on the rear surface; A nitrogen gas supply device connected to a nitrogen gas conduit connection port of the nozzle via a nitrogen gas conduit with an electromagnetic valve, and an electromagnetic valve control device for remotely controlling an electromagnetic valve attached to the nitrogen gas conduit And an air purge device used when brazing a refrigerant tube for a cooling device.

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

2. A sheath tube having an inner diameter corresponding to the outer diameter portion of the refrigerant tube is formed in multiple stages and provided at the center through a nitrogen gas jet port, and a nitrogen gas conduit connection port is formed on a rear surface of the refrigerant tube. Nozzle for supplying nitrogen gas.

[0013]

[Function] At the site, a sheath tube for fitting the nozzle is selected according to the diameter of the refrigerant tube (copper tube), the refrigerant tube is fitted here, and a tape is attached to the outside of the sheath tube and the refrigerant tube as necessary. Roll up and fix. Next, the worker moves to the repair location, performs air purging while controlling the solenoid valve using the solenoid valve control device, and then proceeds to brazing work.

[0014]

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

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

Reference numeral 18 denotes an electromagnetic valve attached to the nitrogen gas conduit 4, and reference numeral 19 denotes an electromagnetic valve control device for controlling the opening and closing of the electromagnetic valve 18. In the case of the embodiment, a wired type using a control line 20 is used. is there. However, the electromagnetic valve 18 may be controlled wirelessly. In the case of the embodiment, the pressure gauge 8 and the flow meter 9 are located on the side of the nitrogen gas cylinder 3 and are separated from each other. However, the pressure gauge and the flow rate may also be read on the solenoid valve controller 19 side. Further, when the cylinder pressure falls below a certain level, a buzzer or the like may be used to notify the occurrence of the fall, thereby preventing the work 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, a nitrogen gas cylinder 3 is set, and a nitrogen gas conduit 4 is connected from the nitrogen gas cylinder 3.
Of the fitting sheath tubes 14, 15, 16, 17 of the nozzle 10 attached earlier, and are inserted and fitted into the sheath tube 16 in which the outer diameter of the refrigerant tube 1 matches. Further, if necessary, the refrigerant pipe 1 is fixed from above the sheath pipe 16 using the tape 6, and the solenoid valve 18 is opened by operating the solenoid valve control device 19, and the nitrogen gas cylinder 3 → the nitrogen gas conduit 4 → the solenoid valve 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 operation, the solenoid valve controller 19 is operated to close the solenoid valve 18 and stop nitrogen gas.

[0018]

As described above, according to the present invention, a nozzle having a multi-stage sheath tube that matches the outer diameter of the refrigerant tube is provided.
The supply of nitrogen gas can be remotely controlled by a solenoid valve controller. As a result, the following effects are obtained.

A. Regardless of the refrigerant pipe of any diameter (outer diameter), the fitting surface can be made large. As a result,
Since the fitting between the refrigerant pipe and the nozzle is firm, there is no risk of air mixing or nitrogen gas leaking during work, so high quality brazing can be performed and nitrogen gas is saved. it can.

B. Since the air purge can be performed by remotely operating the solenoid valve, work efficiency is improved, and only one person is required to be involved in the brazing operation, thereby reducing labor costs.

[Brief description of the 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 purge device.

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

[Description of Signs] 1 Refrigerant pipe 2 Repair location 3 Nitrogen gas cylinder 4 Nitrogen gas conduit 5 Nozzle (conventional product) 6 Tape 7 Manual valve 8 Pressure gauge 9 Flow meter 10 Nozzle (this product) 11 Nozzle body 12 Nitrogen gas Supply port 13 Nitrogen gas conduit connection port 14, 15, 16, 17 Sheath tube for fitting 18 Solenoid valve 19 Solenoid valve control device 20 Control line

Claims (4)

(57) [Claims] 1. A sheath tube having an inner diameter corresponding to an outer diameter portion of a refrigerant tube is formed in multiple stages, a nitrogen gas outlet is provided at the center thereof, and a nitrogen gas conduit connection port is formed on a rear surface. A nitrogen gas supply device connected to a nitrogen gas conduit connection port of the nozzle via a nitrogen gas conduit with an electromagnetic valve, and a remote control of an electromagnetic valve attached to the nitrogen gas conduit. An electromagnetic valve control device, and an air purge device used when brazing a refrigerant pipe for a cooling device. 2. The air purge device according to claim 1, wherein the electromagnetic valve is controlled by wire in the electromagnetic valve control device. 3. The air purge device used for brazing a refrigerant pipe for a cooling device according to claim 1, wherein the electromagnetic valve control device is configured to control the electromagnetic valve wirelessly. 4. A sheath tube having an inner diameter corresponding to the outer diameter portion of the refrigerant tube is formed in multiple stages, a nitrogen gas outlet is provided at the center, and a nitrogen gas conduit connection port is formed on the rear surface. Nozzle for supplying nitrogen gas into the refrigerant pipe.