KR19980052506A - Pipe joint formation structure and pipe joint pipe processing method in piping of automotive air conditioner - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pipe for transporting a liquid or gaseous body in an air conditioner installed in a vehicle including an automobile. In particular, the present invention relates to a pipe joint forming structure and a pipe joint pipe processing method. The present invention relates to a pipe joint forming method for forming an air conditioner pipe for an automobile to have a pipe joint forming structure by a unique flare method, so that all the problems caused by the conventional soldering method are not generated at all, and particularly in automobiles. By improving the pipe joint method to the pipe of the built-in air conditioner, even if the vibration stress of the car reaches the pipe joint part, the pipe joint part is not damaged so that the pipe can be easily replaced (repaired) when there is damage to the pipe. And it is characterized in that to facilitate the piping work of the air conditioner quickly, the air for automobiles according to the present invention Pipe fitting formation structure and pipe processing method in pipes After cutting, deburring and caulking by chucking pipe and trimming, bending, and bending by roller burnishing tufts, the end of pipe is expanded through rinsing operation It is to form a swivel nut joint structure or flange joint structure that can be assembled and disassembled by forming a groove to be fitted. When the pipe joint forming structure is applied to a vehicle air conditioner pipe by the pipe processing method according to the present invention, the pipe work is quick and easy, and the pipe joint is not vulnerable, so it is suitable for automobiles with high vibration.

Description

Pipe joint formation structure and pipe joint pipe processing method in piping of automotive air conditioner

1 is an exploded perspective view of the swivel nut type pipe joint method according to the pipe joint forming structure of the present invention,

2 is an assembly cross-sectional view of the swivel nut type pipe joint method according to the pipe joint forming structure of the present invention,

3 is an exploded perspective view of a flanged pipe joint method according to the pipe joint forming structure of the present invention,

4 is an assembled cross-sectional view of a flanged pipe joint method according to the pipe joint forming structure of the present invention,

* Description of the symbols for the main parts of the drawings *

P1, P2, P3, P4: Pipe N: Swivel Nut

N1: Locking jaw B: Pipe type bolt

B1: Bolt screw B3: Bolt head

C: Clamping jaw O: O-ring

h, Oh: O-ring groove F1, F2: Flange

ph1, ph2: Pipe insertion hole bh1, bh2: Bolt insertion hole

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a pipe for transporting a liquid or gaseous body in an air conditioner installed in a vehicle including an automobile. In particular, the present invention relates to a pipe joint forming structure and a pipe joint pipe processing method. It is about.

The operating principle of the air conditioner is to compress the refrigerant through the feed pipe by the compressor and enter the evaporator through the pressure reducing valve. At this time, the pressure of the refrigerant decreases rapidly, and accordingly, the refrigerant in the liquid body evaporates and vaporizes. In this way, when the phase transformation occurs in the gas phase into the liquid phase, the refrigerant absorbs heat from the surroundings, and thus the temperature around the evaporator is lowered. It is sent to the condenser, where the refrigerant in the gas phase undergoes phase transformation into liquid phase, and in this case, unlike the evaporator, heat is released. By using the endothermic effect of the evaporator, it is possible to lower the air temperature in the summer season. It is

Therefore, the air conditioner pumps the liquid or gaseous refrigerant from the compressor to the evaporator and from the evaporator to the condenser by the pipe as described above, so that airtightness is maintained in the piping. Requires attention.

Therefore, the pipe joint is very important in the air conditioner piping. Generally, the air conditioner pipe connection means uses a flare connection method and a brazing connection method.

Flare connection method is to connect two pipes and the tube to be connected by fitting the fastener, and when connecting the pipe to the fastener, widen the end of the pipe so that the fastener is tight and the flare for airtightness is tightened. There are two methods of soldering: soldering and silver soldering. The soldering method connects pipes and pipes with couplings or hinges, and connects the pipes to seal the pipes by pouring the molten solder that melts the soldered solvent. The silver solder connection method is a method of soldering pipe joints using silver alloy as a material.

By the way, the pipe joint means used for the piping of the conventional air conditioner for automobiles uses the brazing method among the said processes.

However, this soldering method must be very clean the surface of the soldered part, the material (lead or silver alloy material) must be clean, and the facility that can generate heat when piping (for example, acetylene welding torch, etc.) Soldering work was generally done by hand, which made it difficult to ensure uniformity of work, and required a lot of operators, and the work time was considerable.

Particularly, in the case of silver soldering, it is a method commonly used in automobile air conditioners because it has the advantage of maintaining the maximum strength while connecting pipes without leaking. This method is soldered because a certain amount of cadmium is mixed in the material. Care should be taken to avoid smoke or contact with eyes or skin while rinsing the outside of the fully soldered joints with chemicals.

The reason for this is that rinsing is necessary because the metal remaining in the pipe corrodes the pipe metal. In addition, silver soldering has a problem that the price of the material is considerable, and a portion where the silver alloy is not attached due to carelessness of the worker during the soldering process is often generated. The soldering method is difficult to remove when the solvent enters the facility during operation. The soldering method has a problem in that the soldering method is very difficult to repair the air conditioner if a part of the pipe is damaged or a failure occurs in the facility when the pipe is made.

In addition, when the air conditioner for the automobile is formed by the soldering method as described above, the vibration generated during the driving of the vehicle extends to the pipe and the soldered part is generally weaker than the other parts, so the pipe is easily damaged. There was this.

As described above, when the pipe joint is soldered in the piping of an automotive air conditioner, the present invention has been devised because of a number of problems, and an object of the present invention is to provide an automotive air conditioner pipe. By making the pipe joint method have a pipe joint forming structure by a unique flare method, so that all the problems caused by the conventional silver soldering method are not generated at all, and in particular, by improving the pipe joint method in the piping of the air conditioner embedded in the automobile, Even if the vibration stress of the car reaches the pipe joint part, it prevents the pipe joint part from being damaged so that it is easy to replace (repair) the pipe when there is damage to the pipe, and to facilitate the piping work of the air conditioner quickly. It is.

Hereinafter, in the automotive air conditioner pipe according to the present invention, a pipe joint forming structure and a pipe processing method will be described in detail with the accompanying drawings.

1 is an exploded perspective view of an embodiment having a pipe joint forming structure in an automotive air conditioner pipe according to the present invention, and FIG. 2 is an assembled cross-sectional view according to the present invention. The pipe joint is a swivel nut type.

The swivel nut type pipe joint includes pipe No. 1 (P1) in which a pipe-type bolt (B1) is assembled and fixed to an outer circumferential surface of one end, pipe No. 2 (P2) assembled and connected thereto, and two pipes (P1, P2). Is composed of a swivel nut (N) for assembling and connecting the swivel nut type pipe joint, which is used for vehicle air conditioner piping, so that weight is a problem, so that the pipes (P1, P2) and pipe bolts (B1) Swivel nut (N) should be lightweight, such as aluminum (Aluminium), and the pipe joint method according to the present invention is selected as a plastic material because it is formed in an assembly type.

Looking at the manufacturing process of the first pipe (P1), first cut the pipe to a desired length (Cutting process) and then the foreign material remaining on one end of the pipe to be assembled pipe-like bolt (B) and the rough pipe in the cutting process The surface of the end is smoothed (Deburring process), and the pipe bolt (B) cast by a separate molding process is inserted into the pipe after the cutting and deburring process, and the pipe bolt (B1) is shown in FIG. As shown in the figure, a cylindrical hole penetrating the center is formed, and the first pipe P1 is fitted thereto.

When the pipe bolt B is fitted to one end of the first pipe P1, the bolt screw B1 is inserted into the free end of the pipe and the bolt head B3 is inserted in the opposite direction.

When the pipe bolt B is inserted into the pipe P1, the end of the pipe 1, in which the pipe bolt B is inserted, is expanded through the coulking machine. When the end of the pipe radially upward while expanding the inner diameter of the pipe (P1) to form a locking step, as shown in FIG. 2, the pipe-type bolt (B) is tightly fixed to the end of the first pipe (P1). .

In this manner, after the bolt B is assembled and fixed to one end of the first pipe P1 by the expansion process, the state in which the bolt B is tightly fixed to the dill end of the first pipe P1 of the pipe bolt B is reliably fixed. In order to finish, the roller burnishing process is to press the inner diameter surface of one end of pipe No. 1 where the pipe bolt B is coupled to the outer diameter by a roller burnishing tool. Do it.

After the roller burnishing process, bend to deform the pipe 1 to the desired shape after deburring or trimming to remove foreign substances or metal powder on the surface of the pipe. (Bending process) Rinse clean as washing water (Rinsing process).

Next, look at the manufacturing process of the second pipe (P2) is the same process having the same purpose as the manufacturing process of the second pipe (P2), the first pipe (P1) cutting the deburring process and then the pipe joint An operation of expanding one end of the pipe to be formed is carried out, and the degree of expansion is extended so that it can be inserted into the pipe 1 of P1. Next, the one end portion of the pipe 2, which is expanded, is formed by rolling in a constant shape as shown in FIG. 1, and the economic portion that is not expanded and the piped portion protrudes out of the outer diameter of the pipe. A ring is formed, and a yaw ring which is recessed toward the inner diameter toward the end side of the second pipe P2 is formed. The iron ring is a clamping jaw (C) that the locking jaw (N1) of the swivel nut (N) to be described later is caught, the yaw groove ring is a ring (O) ring (O) The O-ring fitting groove h is fitted.

Thus, when the rolling process of forming the clamping jaw (C) and the O-ring fitting groove (h) is finished, the second tube is finally finished in the washing process (Rinsing) after washing through the trimming process.

The swivel nut (N) is molded through the address, one inner diameter that can be fitted to the second pipe as shown in Figure 2 has a minimum diameter, but this minimum diameter of the second pipe (P2) The catching jaw N1 is formed in the swivel nut N by being able to be caught by the clamping jaw C. The inner circumferential surface of the other end side of the swivel nut N, that is, the portion other than the clamping jaw C, is engaged with the screw formed on the outer circumferential surface of the pipe-shaped bolt B formed in the pipe No. 1 P1. Threads can be machined and thus have an inner diameter.

Looking at the pipe joint forming structure connecting the pipe by the first pipe (P1), the second pipe (P2) and the swivel nut (N) made by such a process, as shown in FIG. Insert the rolled end side of the No. 2 pipe (P2) into which the O-ring (O) and the swivel nut (N) are fitted on the side where the pipe bolt (B) of P1 is formed, and insert the swivel nut (N) into the pipe bolt (B). ), Tighten the swivel nut (N) while pulling the number 2 pipe (P2), making one side end and inner diameter match the number 1 pipe (P1), and the pipe type bolt (B) is number 1 pipe (P1). At the same time, O-ring (O) seals the pipes of the first pipe (P1) and the second pipe (P2) while pulling closely to the second pipe (P2).

3 and 4 are exploded perspective and cross-sectional views of an embodiment of a flange welded type pipe joint according to another embodiment of a pipe joint forming structure according to the present invention. to be.

The flanged pipe joint is formed by a flange (F1) and a flange (F2) formed by assembling and fixing a pipe (P3, hereinafter referred to as pipe 3) and a pipe (P4, hereinafter referred to as pipe 4). Pipe No. 3 (P3) is made by cutting the aluminum pipe to the required length (cutting process) and burying it at the end of the pipe to remove any foreign matter or metal residue or to perform the deburring process to make the rough surface slippery in the cutting process. After casting and molding separately, the pipe insertion hole (ph1) and the bolt insertion hole (bh1) is formed, and the pipe end is inserted into the first flange (F1) in which the pipe ends are slightly protruded. When using a caulking machine to expand the pipe, that is, the inner diameter of the pipe F1 is inserted, the pipe at the end of pipe No. 1 flange F1 is expanded. Close to inner diameter Since the first standing times flange (F1) and the pipe 3 (P3) is fixed mutual assembly.

At the same time, the O-ring insertion groove Oh is formed on the end side of the third pipe P3 protruding out of the flange F1 (Rolling process), and then, the roller burnishing tool is used. The inner diameter of the pipes of the machined part is trimmed to make it more precise in size adjustment and the flange and the pipe are firmly connected. Next, look at the pipe number 4 (P4) and the flange number 2 process, after cutting (cutting) to the required length and deburring (Deburring), the pipe inlet (ph2) and bolt inlet (1) like the flange 1 (F1) bh2) is formed, and the second flange (F2) is cast in aluminum in a form in which two cylinders are connected to the side, and the fourth pipe (P4) is inserted into the pipe insertion port (ph2) of the second flange (F2). .

Thus, the insertion part of the 4th pipe P4 inserted into the pipe insertion port ph2 of the 2nd flange F2 is expanded using a caulking machine, and the edge part of the 4th pipe P4 of the 2nd flange F2 is expanded. The flange and the pipe are completely adhered to each other by closely fitting the pipe insertion port ph2 to the inside diameter of the pipe, and by trimming the portion by roller burnishing tulle. At this time, the inner diameter of the pipe insertion port (ph2) formed in the second flange (F2) is formed to be slightly shorter than the inner diameter of the pipe insertion port (ph1) of the first flange (F1) so that the pipe 3 (P3) in the flange formed state Make sure that it fits into pipe 4 (P4).

Forming flanges (F1, F3) in each of the pipes (P3, P4) in this manner, trimming them (P3, P4) and then bend the pipes to the desired shape and wash them with washing water ( Rinsing)

Looking at the pipe joint forming structure connecting the pipe and the pipe by the flanged pipe and the pipes (P3, P4) manufactured in the same process as described above, as shown in Figure 4 to the third pipe (P3) Insert O-Ring on the end portion protruding through the flange 1, and this part is the pipe where the flange 2 of the pipe 4 is assembled, that is, the pipe of the flange 2 F2. When inserted into the insertion port (ph2), the pipe 3 is inserted in close contact with the inner diameter of the pipe 4 (P4), the pipe and the pipe is in communication, and the O-ring (O) is connected to the joints of the pipe 3 and 4 Sealed, the flange 1 and the flange 2 (F2) is in contact with each other and the bolt inlet (bh1, bh2) formed in each flange is in communication with each other, as shown in FIG. , bh2) to connect the pipe and the pipe while tightening the bolt (B) and the nut (N).

When manufacturing the air conditioner for automobiles by the pipe joint forming structure and pipe processing method according to the present invention having the configuration and action as described above, unlike the conventional brazing connection method or welding connection method as an assembly method O-rings and bolts and nuts are used to assemble and to maintain the tightness of the pipe to prevent leakage of liquids or gases in the pipe joints. There is no fear of the unoccupied part and no necessary equipment for soldering or welding, and the pipe joint according to the present invention is prefabricated as well as quick and easy to improve productivity and reduce product cost.

If some pipes are damaged (corrosion, etc.) while using the air conditioner, or they need to be replaced during repair of other air conditioners, the pipe assembly with the pipe joint structure according to the present invention is a prefabricated pipe. It can be achieved easily and quickly. In particular, the pipe joint structure of the present invention can obtain a synergistic effect as it is used in a vehicle air conditioner piping, but the vehicle, such as a car is very severe vibration, so when welding the pipe as in the prior art (Brittle) welding parts easily damage Since there is a lot of fear that the gas or liquid is leaked, but if the pipe structure of the air conditioner as a pipe joint structure according to the present invention, there is no special fragile part in the pipe joint portion, so the air conditioner pipe life will last as long.

Claims (4)

In the automotive air conditioner pipe, a pipe-type bolt (B) having a hole through which an inside penetrates is formed on the outer circumferential surface of the one end of the pipe (P1), and the pipe (P1) end is extended radially. The pipe bolt (B) is fixed, and on the outer circumferential surface of the other pipe (P2) to the boundary that is not expanded and the expansion portion of the one end portion that is expanded enough to be inserted close to the expanded end of the first pipe A convex ridge raised ring-shaped clamping jaw (C) is formed, and an O-ring fitting groove (h) is formed in the shape of a recessed groove ring in which an O-ring (O) is fitted in the middle portion of the expanded portion. To the end of the pipe P1, which is expanded and the pipe-shaped bolt B is formed, and the other end of the pipe is fitted with the O-ring fitting groove and the clamping jaw C which is fitted with the O-ring of the other pipe P2, and then the other pipe. Swivel nut from the other end of (P2) Insert the (N) and the swivel nut (N) is caught by the clamping jaw (C) formed in the other pipe (P2) and meshed with the pipe-type bolt (B) formed in one pipe (P1), one pipe (P1) ) And another pipe (P2) is in communication with the pipe joint forming structure. According to claim 1, after cutting the pipe to a predetermined length and performing a deburring process, the pipe-type bolt (B) is inserted into the end of the pipe and the pipe-type bolt is tightly fixed to the pipe end by expanding the inserted portion as a caulking machine It is finished by roller burnishing fouling to further solidify the adhesion, and then, after deburring or trimming, the pipe is bent to the desired shape and washed with washing water to process one pipe (P1), and the predetermined length After cutting the furnace pipe to perform the deburring process, expand the end of the pipe through the rolling process to form the clamping jaw (C) and the O-ring fitting groove (Oh), deburring or trimming, and then bending the pipe to a desired shape. Pipe processing method of pipe joint to process another pipe (P2) by washing. In an automotive air conditioner pipe, an end of one pipe P3 is expanded to a pipe insertion port ph1 of one flange F1 formed in a body in which a cylindrical pipe insertion port ph1 and a bolt insertion port bh1 are parallel to each other. Assembled and fixed in a fitted state to be protruded by a predetermined length, and an O-ring insertion groove Oh, which is a recess, is formed at an end of the protruding pipe P3, and a pipe insertion port ph2 and a bolt insertion hole bh2 are formed. Insert one pipe P4, which is expanded to the pipe end ph2 of the other flange F2, with the inner diameter enough to fit the expanded end of the one pipe P3, into the piped end, and one flange. (F1) and the other flange (F2) to match the two bolt insertion holes (bh1, bh2) to match the bolt inserted into the pipe forming structure. The pipe is cut by a coking machine according to claim 3, wherein the pipe is cut to a predetermined length and deburred, and the pipe P3 is inserted into the pipe insertion port ph1 of the flange F1 so as to protrude by a predetermined length. Expand the end side so that the flange (F1) and the pipe (P3) is tightly fixed, and after rolling the O-ring insertion groove (Oh) in the protruding end of the expanded state, it is finished by roller burnishing fouling and deburring or After cutting through the trimming process to process one pipe (P3), cut the pipe to a predetermined length, and after deburring and inserted into the pipe insertion port (ph2) of the flange (F2) coincides with the coking, Pipe (P4) and flange (F2) are fixed to each other, which is then finished by roller burnishing fouling, deburring, trimming and washing to process another pipe (P4) Way.