KR100829546B1 - Apparatus of brazing copper pipes using carbon heating source - Google Patents

Abstract

An apparatus of brazing a copper pipe using a carbon heating member is provided to bond two copper pipes by melting a silver solder ring by resistance heat generated using a carbon electrode and the copper pipes. An apparatus of brazing a copper pipe using a carbon heating member comprises a handheld housing and a pair of clamping members(112,114). The clamping members are connected with a fixing shaft of the housing while facing each other. An air cylinder(130) is fixed to the housing and includes a piston(132) having an end that extends toward the rear end portion of the clamping members. A bracket member(120) is located between the piston and the rear end portion of the clamping members. A pair of carbon heating member electrode members(102,104) are fixed to the front end of the clamping members while facing each other. A power supply(150) is installed in the housing to provide electric energy to the electrode members.

Description

Copper pipe brazing apparatus using carbon heating element {Apparatus of Brazing Copper Pipes using Carbon Heating Source}

1 is an external perspective view of a preferred embodiment of a copper pipe brazing apparatus using a carbon heating element according to the present invention.

2 shows a cross-sectional view taken along the line A-A of FIG.

3 is a plan view of a copper pipe brazing apparatus using a carbon heating element according to the present invention, and FIG. 4 is a side view of FIG. 3.

5 shows another preferred embodiment of the copper pipe brazing apparatus using the carbon heating element according to the present invention.

The present invention relates to a copper pipe brazing apparatus using a carbon heating element, and more particularly, to an apparatus capable of improving copper pipe brazing workability of welding a refrigerant copper pipe such as an air conditioner or a refrigerator.

In products such as refrigerators and air conditioners, the refrigerant is compressed using a compressor, and then the compressed refrigerant gas is cooled coolly through a condenser. The cooled compressed refrigerant gas then becomes a liquefied gas of low temperature and low pressure as it passes through the capillary tube, and the liquefied gas turns into a gas through an evaporator to absorb the surrounding heat, thereby rapidly reducing the ambient temperature. The heat absorbed refrigerant is circulated back to the compressor.

In such a cooler, a refrigerant pipe is mainly used as a circulation passage. The used copper pipe is brazed to connect the copper pipes to a desired length in the process of forming the refrigerant circulation passage. Brazing is a technique of joining two base materials by applying a filler material and heat at the base material melting point below the base material melting point to be joined at 450 degrees or more. In the field of such a cooler, there are butt joints, overlap joints, mixed joints, and the like, depending on the pipe joint form.

In general, brazing has been performed by using an oxygen torch to simultaneously heat the joint and the silver solder rod to melt the silver solder, which is a filler material, and soak into the joint. This method of heating using oxygen gas requires a great care in handling because there is always a risk of fire, and the skilled person has been required because the quality of the joint state of the joint is determined according to the skill of the operator.

In order to solve this problem, Korean Patent No. 597983 discloses an induction heating welding apparatus for a metal pipe. In this patent, each end of two pipes is inserted into a joint and interconnected. Subsequently, when the joint is wrapped with an induction coil and a high frequency current is applied to the induction coil, heat generated by the eddy current and iron loss induced in the joint melts the solder material between the inside of the joint and the pipe to weld.

However, such a high frequency heating method is difficult to use because the resistance heat generation efficiency due to the eddy current is low in a material with high electrical conductivity such as copper. Therefore, the patent inevitably adopts a method of melting a solder material by induction heating of a metal material called a joint and then transferring heat generated in the joint to a pipe. In other words, the high frequency induction heating method has a limitation in use that cannot be directly heated and joined.

An object of the present invention is to connect the two copper pipes by melting the silver lead ring by the heat of resistance generated by using the contact resistance of the carbon electrode and the copper pipe by directly contacting the carbon electrode with the copper pipe in order to solve the problems of the prior art. It is to provide a copper pipe brazing apparatus using a carbon heating element that can be made.

Another object of the present invention is to provide a copper pipe brazing device which can be manufactured in a clamp type that is easy to carry and can improve workability.

Still another object of the present invention is to provide a copper pipe brazing device capable of easily joining a refrigerant pipe even for an inexperienced person.

In order to achieve the above object, the device of the present invention is a configuration of one embodiment of the copper pipe brazing device of the present invention is a hand-held housing and a rear end pivotally connected to the fixed shaft of the housing so as to face each other and extending rearward of the fixed shaft. The pair includes a pair of clamp members each formed with a shaft hole, an air cylinder fixed to the housing, the piston end extending toward the rear end of the pair of clamp members, and a rear end of the piston and the pair of clamp members, One end is rotatably coupled to each of the shaft holes of the pair of clamp members, and the other end is fixed to the front end of the pair of clamp members, the bracket member coupled to the piston end, respectively, and the outer half face of the overlapping copper pipe. A pair of carbon heat generating grooves each formed in the clamping surface with grooves extending in the longitudinal direction of the copper pipe so as to surround the Is embedded in the electrode member and the housing to enter the commercial AC includes a power supply for supplying electrical energy to the pair of the carbon heating element electrode member.

Therefore, after placing the silver lead ring at the end of the overlapping portion of the two copper pipes, electric energy is supplied to the pair of carbon heating element electrode members to melt the silver lead by the resistance heat caused by the resistance of the carbon heating element electrode member and the contact resistance of the clamping surface. The overlapping contact surface is sealedly contacted.

The construction of another embodiment of the present invention comprises a hand held housing, an 'a' shaped support member fixed to the housing and extending forward, an air cylinder fixed to the housing and having a piston end extending toward the end of the support member, the piston A movable member coupled to an end of the movable member coupled to one side thereof to reciprocate along an extension of the supporting member, and fixed to face each other on the inner surface of the end of the supporting member facing each other and the front end surface of the movable member, respectively A pair of carbon heating element electrode members each formed in the clamping surface with grooves extending in the longitudinal direction of the copper pipe so as to surround the outer half surface of the copper pipe, and built into the housing and input a common flow to the pair of carbon heating element electrode members It includes a power supply for supplying electrical energy.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. This embodiment is described in sufficient detail to enable those skilled in the art to practice the invention.

1 is an external perspective view of a preferred embodiment of a copper pipe brazing apparatus using a carbon heating element according to the present invention. 2 is a cross-sectional view taken along line A-A of FIG. 1, FIG. 3 is a plan view of a copper pipe brazing apparatus using a carbon heating element according to the present invention, and FIG. 4 is a side view of FIG.

Referring to the drawings, the brazing device has a structure of a handheld housing 100 and a pair of clamp members 112 and 114, a bracket member 120, an air cylinder 130, a handle 140, and a power supply unit 150. Include.

Each of the clamp members 112 and 114 is rotatably installed on the fixed shaft 116. The fixed shaft 116 is fixed between the pair of cantilever beams 136 and 138 protruding forward from the air cylinder 130. Carbon heating element electrodes 102 and 104 are screwed to opposite surfaces of the clamp members 112 and 114, respectively. The clamping surfaces of the carbon heating element electrodes 102 and 104 are formed with grooves extending in the longitudinal direction of the copper pipe so as to surround the outer half surface of the overlapping copper pipe. The grooves 106 and 108 have a radius of curvature that is joined to each other and circumscribes the outer surface of the copper pipe to be joined. Preferably, the locking jaw 109 is formed in the middle of the grooves 106 and 108 so that the upper portion of the groove from the locking jaw has a radius of curvature circumscribed to the outer surface of the pipe joint, and the lower portion of the groove from the locking jaw does not overlap the outer surface of the copper pipe. It has a radius of curvature circumscribed to. Therefore, the overlapping portions of the overlapping copper pipes 10 and 12 are circumscribed on the upper grooves and are caught and supported by the locking jaw 109. The carbon heating element electrodes 102 and 104 are connected by the power supply unit 150 and the wires 152 and 154 to receive electrical energy. The carbon heating element electrodes 102 and 104 are composed of a plurality of sets having grooves corresponding to the diameters of the copper pipes 10 and 12 to be joined, and can be replaced with electrodes having corresponding apertures by screwing.

A handle 140 is coupled to the rear end of the air cylinder 130, and the rear end of the bracket member 120 is rotatably connected to the end of the piston 132 of the air cylinder 130. The bracket member 120 is composed of two rods 122 and 124 provided with shaft holes at both ends thereof. The rods 122, 124 are commonly rotatably coupled to the ends of the piston 132 by pins 134. The distal end of the rod 122 is rotatably coupled to the distal end of the clamp member 112 by the pin 116 and the distal end of the rod 124 is rotated by the pin 118 at the distal end of the clamp member 114. Possibly combined.

The power supply unit 150 supplies electrical energy generated by a power circuit composed of components such as a transformer, a rectifier, a switching transistor, a capacitor, and a resistor installed inside the handle 150 to the carbon heating elements 102 and 104. To control. The power supply unit 150 is electrically connected to the commercial AC through the AC cord 160 drawn from the rear of the handle 150. The handle 150 is rod-shaped so that it is easy to hold by hand, the surface of the grip portion is preferably knurled to prevent slipping.

Referring to the effects of the present invention configured as described above are as follows.

The carbon heating element electrodes 102 and 104 corresponding to the diameter of the copper pipe to be overlapped are prepared and screwed to the clamp members 112 and 114.

Subsequently, when the piston 132 of the air cylinder 130 moves backward, the rods 122 and 124 of the bracket member 120 move backward, and the clamp members 112 and 114 rotate about the fixed shaft. The end portions are moved toward the center in a direction close to each other. Therefore, the tips of the clamp members 112 and 114 are opened. The copper pipes 10 and 12 overlapping each other through the gaps are positioned between the grooves 106 and 108 of the carbon heating element electrodes 102 and 104. And the silver solder ring 20 is located in a junction part.

Subsequently, when the piston 132 moves forward, the rods 122 and 124 of the bracket member 120 move forward, and the clamp members 112 and 114 rotate about the fixed shaft so that the end portion faces the center opposite direction. They move in a direction away from each other. Therefore, the tip portions of the clamp members 112 and 114 are rotated in a direction toward each other toward the center so that the joints of the copper pipes 10 and 12 are tightly contacted in the grooves 106 and 108 of the carbon heating element electrodes 102 and 104. Will be.

Subsequently, when the electric power is supplied to the carbon heating element electrodes 102 and 104 by turning on the switch of the power supply unit 150, Joule heat is generated by the internal resistance of the carbon heating element electrodes 102 and 104 and the contact resistance of the contact portion. The temperature of the heating element electrodes 102 and 104 rises. The elevated temperature is transmitted to the silver lead ring 20 through the copper pipe. As the temperature rises, the silver lead ring 20 is melted and rapidly wetted by gravity and capillary action between the joints of the two copper pipes 10 and 12. Therefore, the joint between the two copper pipes 10, 12 is securely and firmly sealed.

5 shows another preferred embodiment of the copper pipe brazing apparatus using the carbon heating element according to the present invention.

Another embodiment is a C-shaped clamp structure, the hand-held housing 210, the 'b' shaped support member 220 fixed to the housing and extending forward, and fixed to the housing 210, the piston end is supported An air cylinder 230 extending toward the end of the member 220 and a moving member 240 coupled to an end of the piston and coupled to one end thereof so as to reciprocate along an extension of the support member 220, face each other. The grooves extending in the longitudinal direction of the copper pipe are fixed to the inner surface of the end of the support member 220 and the front end surface of the movable member 240 so as to face each other, and to surround the outer half surface of the overlapping copper pipe. And a pair of carbon heating element electrode members 250 respectively formed on the surface, and a power supply unit 260 for supplying electrical energy to the pair of carbon heating element electrode members by inputting a common exchange.

The support member 220 includes an extension part 222 extending from the housing 210 and an end part 224 bent at 90 degrees at the end of the extension part 222. Overall, the coupling of the support member 220 and the housing 210 has a C-type clamp structure. A guide rail is formed on an inner side surface of the extension part 222, and the moving member 240 is coupled to the guide rail to reciprocate.

The carbon heating element electrode 252 is assembled on the inner side surface 225 of the end portion 224 of the supporting member 220, and the carbon heating element electrode 254 is assembled on the front end surface 242 of the moving member 240. Face to face.

The moving member 240 is coupled to the end of the piston 232 of the air cylinder 230 and along the guide rail formed on the inner surface of the extension 222 of the support member 220 by the reciprocating motion of the piston 232. Linear reciprocating motion.

The clamping surfaces of the carbon heating element electrodes 252 and 254 are formed with grooves 256 and 258 extending in the longitudinal direction of the copper pipes so as to surround the outer half surfaces of the overlapping copper pipes, respectively.

The power supply unit 260 is a carbon heating element electrode through the electric wires (262, 264) electrical energy generated by the power circuit consisting of components such as transformers, rectifiers, switching transistors, capacitors, resistors installed inside the housing 210 To be supplied to 252 and 254. The power supply unit 260 is electrically connected to the commercial AC through the AC cord 266 drawn from the rear of the handle of the housing 210.

Since the effect of the C-type clamp type copper pipe brazing device, which is another embodiment configured as described above, is similar to the effect of the copper pipe brazing device of the seesaw clamp type, the detailed description thereof will be omitted.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

As described above, in the present invention, in the case of overlapping and joining pipes such as copper pipes having good electrical conductivity, since the copper pipes are directly melted by heating the copper pipes directly through the carbon heating element electrode without any additional components or mediators, the operation is performed. Because of this simplicity, even the unskilled person can easily join the work.

Claims (3)

A brazing device for joining two copper pipes to one another, Hand held housing; A pair of clamp members rotatably connected to the fixed shaft of the housing so as to face each other, and having shaft holes formed at rear ends thereof extending rearward of the fixed shaft; An air cylinder fixed to the housing, the piston end extending toward the rear end of the pair of clamp members; A bracket member positioned between the piston and a rear end of the pair of clamp members, the pair of one ends rotatably coupled to the shaft holes of the pair of clamp members, respectively, and the other end coupled to the piston end; A pair of carbon heating element members each fixed to the front end of the pair of clamp members, the grooves extending in the longitudinal direction of the copper pipe to the outer half faces of the overlapping copper pipes respectively formed on the clamping surfaces; A power supply unit embedded in the housing and inputting commercial exchange to supply electrical energy to the pair of carbon heating element electrode members; The silver lead ring is positioned at the end of the overlapping portions of the two copper pipes, and then electrical energy is supplied to the pair of carbon heating element electrode members, thereby providing the silver lead by resistance heat caused by the resistance of the carbon heating element electrode member and the contact resistance of the clamping surface. And melting the copper pipe to seal the overlapping contact surfaces of the copper pipes. The method of claim 1, wherein the groove Copper pipe brazing apparatus, characterized in that the step is formed to accommodate both the overlapping portion and the non-overlapping portion of the copper pipe. A brazing device for joining two copper pipes to one another, Hand held housing; A '-' shaped support member fixed to the housing and extending forward; An air cylinder fixed to the housing and having a piston end extending toward an end of the support member; A moving member coupled to an end of the piston and coupled to one end to allow a reciprocating motion along an extension of the support member; The longitudinal grooves of the pipes are fixed to the inner surface of the end of the support member facing each other and to the front face of the movable member, and the grooves extending in the longitudinal direction of the pipe to surround the outer half of the overlapping copper pipe are provided on the clamping surface. A pair of carbon heating element electrode members each formed; A power supply unit embedded in the housing and inputting commercial exchange to supply electrical energy to the pair of carbon heating element electrode members, The silver lead ring is positioned at the end of the overlapping portions of the two copper pipes, and then electrical energy is supplied to the pair of carbon heating element electrode members, thereby providing the silver lead by resistance heat caused by the resistance of the carbon heating element electrode member and the contact resistance of the clamping surface. And melting the copper pipe to seal the overlapping contact surfaces of the copper pipes.

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