KR20140134356A - Hydroforming method of molding hydro forming - Google Patents

Hydroforming method of molding hydro forming Download PDF

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Publication number
KR20140134356A
KR20140134356A KR1020130053706A KR20130053706A KR20140134356A KR 20140134356 A KR20140134356 A KR 20140134356A KR 1020130053706 A KR1020130053706 A KR 1020130053706A KR 20130053706 A KR20130053706 A KR 20130053706A KR 20140134356 A KR20140134356 A KR 20140134356A
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KR
South Korea
Prior art keywords
pipe
refrigerant
discharge
punches
connection pipe
Prior art date
Application number
KR1020130053706A
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Korean (ko)
Inventor
김갑수
Original Assignee
삼원동관 주식회사
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Application filed by 삼원동관 주식회사 filed Critical 삼원동관 주식회사
Priority to KR1020130053706A priority Critical patent/KR20140134356A/en
Publication of KR20140134356A publication Critical patent/KR20140134356A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/037—Forming branched tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Branch Pipes, Bends, And The Like (AREA)

Abstract

The present invention relates to a method of forming a branch tube for installing an air conditioner utilizing a hydroforming method for distributing and supplying a refrigerant to a use place, comprising the steps of: a) providing an inlet connection pipe and a first discharge connection pipe integrally formed at one side of the inlet connection pipe; A preparation step of inserting left and right manual punches into both ends of the copper pipe after inserting the copper pipe into the mold frame and supplying the fluid to the left and right manual punches inserted into both ends of the copper pipe, Pressure exerted constantly inside the pipe Pressure of 0.3 to 0.5 MPa The left and right manual punches are moved forward to advance to the center of the copper pipe and the right and left manual punches are moved to the left and right manual punches through the pressure increase source connected to the left and right manual punches, A step of increasing the pressure of 200 to 300 MPa to expand the outer surface of the copper pipe to form a second refrigerant discharge pipe having a shape corresponding to the molding core provided in the metal mold, And a joining step of joining the second discharge connection pipe to the second refrigerant discharge pipe formed in the booster step while welding the second discharge connection pipe.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of forming a branch tube for an air conditioner using a hydroforming method and a branch tube formed by the method.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of forming a branch tube installed in an air conditioner such as a refrigerator or an air conditioner, and more particularly, to a method of forming a branch tube of a "Y" A first discharge connection pipe and a second refrigerant discharge pipe are integrally formed so that a separate welding operation is not required and a leakage phenomenon on a welded portion can be prevented beforehand, To a branch tube formed by the method.

The air conditioner has an outdoor unit installed outside the room, an indoor unit installed in the room, and a refrigerant pipe installed between the outdoor unit and the indoor unit.

As shown in FIG. 1, a plurality of indoor units 12, 14, 16, and 18 are mounted on a single outdoor unit 1, and each of the indoor units 12 and 14 (16) and (18), respectively, by control means 13, 15, 17 and 19 such as a remote controller or a controller.

The refrigerant cooled in the outdoor unit 1 when the indoor units 12, 14, 16 and 18 are mounted on one outdoor unit 1 is supplied to the indoor units 12, 14, 16 The connection pipe 2 is piped in the outdoor unit 1 and the branch pipe 3 is piped at the end of the connection pipe 2. The connection pipe 4 is connected to the branch pipe 3, And another branch pipe 6 is connected to one of the connecting pipes 4 and the indoor unit 12 is connected to the other connecting pipe 5. [

That is, two branch pipes are connected to each branch pipe, one of the connected pipes is connected to the indoor unit, and the other branch pipe is connected to the other branch pipe. The branch pipe divides the high-pressure refrigerant Point.

The conventional branch tubes 3, 6 and 9 have an inlet connection tube 24 and a discharge tube 25 on the opposite side to the Y branch tube 20 as shown in FIG. .

The above-described Y branch tube 20 forms a bifurcated tube by applying pressure to the large-diameter portion of the tube with a predetermined length as shown in Fig.

More specifically, as shown in Fig. 3 (a), a coolant inlet pipe 21 is formed to have a predetermined length, and one of the small diameter pipes 21a As shown in Fig. 3 (c), the large diameter portion 21b is pressed and pressed to have a predetermined diameter by using a tool such as a core, Is formed with a pressing joint 21c by a coupling means such as welding.

That is, the large-diameter portion 21b described above forms the first refrigerant discharge pipe 22 and the second refrigerant discharge pipe 23 by the pressurizing joint portion 21c, and as shown in FIG. 2, enters the refrigerant inlet pipe 21 The connection pipe 24 is integrally formed and the discharge connection pipes 25 and 26 are connected to the first refrigerant discharge pipe 22 and the second refrigerant discharge pipe 23, respectively.

The above-described Y branch tube 20, the inlet connection pipe 24 and the discharge connection pipes 25 and 26 are connected by welding as copper pipes.

However, the above-described conventional Y branch tube 20 has the following problems.

When a single straight pipe type copper pipe is subjected to axial compression by applying a physical force to the large diameter portion of the pipe, a portion where the double pipe is formed by pressurization is very weak as a notch.

In particular, immediately after the system air conditioner is installed, normal cooling is performed without any abnormality. However, since the refrigerant is circulated at a high pressure, a closed end of the pressure joint portion 2b of the Y branch tube 20 is generated by the high-pressure refrigerant.

In addition, since the inlet connection pipe and the discharge connection pipe connected to the Y branch pipe are individually welded, there is a serious problem that not only the workability due to assembly is lowered but also normal cooling can not be performed due to leakage of water on the welding portion.

Prior art literature

Document 1: Korean Patent Registration No. 10-0611330

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems and to solve the above and / or other problems, and an object of the present invention is to provide a branch pipe having a first end and a second end, The present invention provides a method of forming a branch tube for air conditioner using a hydroforming method that does not require a separate welding operation by integrally molding and prevents a leakage phenomenon beforehand on a welded portion, and a branch tube formed by the above method.

The present invention relates to a method of forming a branch tube for installing an air conditioner utilizing a hydroforming method for distributing and supplying a refrigerant to a use place, comprising the steps of: a) providing an inlet connection pipe and a first discharge connection pipe integrally formed at one side of the inlet connection pipe; A preparation step of inserting left and right manual punches into both ends of the copper pipe after inserting the copper pipe into the mold frame and supplying the fluid to the left and right manual punches inserted into both ends of the copper pipe, A pre-pressurizing step for exerting a pressure constantly in the inside of the pipe; and a pre-pressurization step for exerting the left and right actuator punch forward to the center of the copper pipe and simultaneously connecting the pressurizing source connected to the left and right actuator punches A fluid of a strong pressure is instantaneously supplied to the left and right actuator punches to expand the outer surface of the copper pipe, A step of forming a second refrigerant discharge pipe having a shape corresponding to the shaped core and a welding step of welding the second discharge pipe in a state where the second discharge pipe is inserted into the second refrigerant discharge pipe formed in the pressing step .

According to another aspect of the present invention, there is provided a branch pipe for distributing and supplying a refrigerant to use, comprising: an inlet connection pipe having a refrigerant inlet flow path for entering a refrigerant; and an inlet connection pipe extending integrally from the inlet connection pipe, A second refrigerant discharge pipe integrally formed between the inlet connection pipe and the first discharge connection pipe, and a second refrigerant discharge pipe integrally formed between the inlet connection pipe and the first discharge connection pipe; And a second discharge connection pipe having a second refrigerant discharge flow path formed therein for discharging the refrigerant entering the refrigerant inlet flow path of the inlet connection pipe into the interior thereof.

In the present invention, when the Y "-type or" T "-type branch tube is formed, the inlet connection pipe through which the refrigerant flows, the first discharge connection pipe, and the second refrigerant discharge pipe are integrally formed so that a separate welding operation is unnecessary, So that the leakage phenomenon on the upper side can be prevented beforehand, so that the cooling effect can be enhanced.

1 shows an embodiment of a general system air conditioner.
Fig. 2 is a drawing showing an example of a conventional branch tube. Fig.
3 is an exemplary view showing a manufacturing process of a conventional branch tube.
4 is a view showing a structure of a branch tube according to a preferred embodiment of the present invention.
FIGS. 5A to 5C sequentially illustrate the process of forming the branch tube shown in FIG. 4. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following detailed description, exemplary embodiments of the present invention will be described in order to accomplish the above-mentioned technical problems. And other embodiments which may be presented by the present invention are replaced by descriptions in the constitution of the present invention.

4 is a view showing a configuration of a branch pipe according to the present invention.

4, the branch pipe 110 according to the present invention includes an inlet connection pipe 112, a first discharge connection pipe 114, and a second discharge connection pipe 118 ).

The inlet connection pipe 112 is a conduit for introducing the refrigerant generated by the operation of the air conditioner (not shown), and a refrigerant inlet flow path 112a is formed therein.

The first discharge connection pipe 114 is integrally formed with the inlet connection pipe 112 and has a first refrigerant discharge flow path 116 connected to the refrigerant entry flow path 112a of the entrance connection pipe 112, Is formed. The first refrigerant discharge passage 116 supplies the refrigerant entering the refrigerant inlet passage 112a to the user.

A second refrigerant discharge pipe 116 extends integrally between the inlet connection pipe 112 and the first discharge connection pipe 114 and a second discharge connection pipe 118 is connected to the second refrigerant discharge pipe 116. [ Welded together.

The second discharge connection pipe 118 includes a second refrigerant discharge passage 118a communicating with the refrigerant inlet passage 112a of the inlet connection pipe 112 in the same manner as the first discharge connection pipe 114 So that the refrigerant entering the second refrigerant inflow passage 118a is supplied to the user.

In the present invention, the inlet connection pipe 112 and the first discharge connection pipe 114 are integrally formed by using a single pipe, And a second discharge connection pipe 118 is inserted into the second refrigerant discharge pipe 116 and welded to the second refrigerant discharge pipe 116, Y "-shaped branch pipe main body, the first and second discharge connection pipes are sandwiched between the connecting pipe and the first and second discharge connecting pipes.

Hereinafter, a process of forming the branch tube having the above structure will be described in detail with reference to FIGS. 5A to 5D.

The method of forming the second refrigerant discharge pipe 116 in the form of a branch pipe between the inlet connection pipe 112 and the first discharge connection pipe 114 in the branch pipe 110 according to the present invention, A specific portion of the copper pipe is inflated by applying a high pressure using fluid to the inside of the copper pipe of the shape.

Such a hydroforming method largely consists of a preparation step (S1), a pre-pressurization step (S2), a pressurization step (S3) and a bonding step (S4).

In the preparing step S1, the tube-shaped copper pipe 150 is inserted into the mold 160, and then the left and right actuator punches 170 and 180 are inserted into both ends of the copper pipe 150 . One end of the copper pipe 150 is connected to the inlet connection pipe 112 and the copper pipe 150 is connected to the inlet pipe 112 Is connected to the first discharge connection pipe 114 (Figure 5A)

The pre-pressurizing step S2 supplies the fluid to the left and right manual punches 170 and 180 inserted at both ends of the copper pipe 150 through the preparation step S1, Is the step of constantly exercising the fluid pressure.

The left and right manual punches 170 and 180 supply the fluid supplied from the outside through the flow paths 172 and 182 formed therein to the inside of the copper pipe 150 to exert the pressure of the fluid. 5b). At this time, it is preferable that the pressure of the pre-pressure step is between 0.3 and 0.5 MPa.

The pressure increasing step S3 is a step of moving the left and right manual punches 170 and 180 in the process of constantly applying the fluid pressure to the inside of the pipe 150 through the pre- The fluid is instantaneously supplied through the pressure increase sources 174 and 184 connected to the left and right actuator punches 170 and 180 so as to instantaneously supply a strong pressure fluid to the center of the copper pipe 150, (150). ≪ / RTI > At this time, it is preferable that the pressure in the step of increasing the pressure is between 200 and 300 MPa.

When the momentary strong pressure is transmitted to the copper pipe 150, the copper pipe 150 expands outward. At this time, the copper pipe 150 is constrained by the mold frame 160 surrounding the outer surface However, if the molding core 162 provided in the mold frame 160 does not surround the pipe 150, if a strong pressure is transmitted to the pipe 150, The outer surface of the pipe 150 is expanded and formed into a shape corresponding to the forming core 162. As a result, the second refrigerant discharge pipe 116 is integrally formed on the outer surface of the pipe 150. [ The position where the second refrigerant discharge pipe 116 is formed is between the inlet connection pipe 112 and the first discharge connection pipe 114 which are the pipes 150 (Figure 5c)

Stepped portions 176 and 186 are formed on the left and right actuator punches 170 and 180 in the pressing step S3 so that the stepped portions 176 and 186 are engaged with the left and right actuator punches 170 and 170. [ 180 are in close contact with both ends of the copper pipe 150 in the process of entering the center of the copper pipe 150 and press the copper pipe 150, 150 are formed to have a uniform thickness and a second refrigerant discharge tube 116 having a shape corresponding to the molding core 162 formed on the mold frame 160 is formed on the outer surface of the copper pipe 150 can do.

In the joining step S4, a second refrigerant discharge pipe 116 is formed between the inlet connection pipe 112 and the first discharge connection pipe 114 through the pressure increasing step S3, The second branch pipe 118 is welded to the second refrigerant discharge pipe 116 to form the branch pipe 110 of the present invention (Figure 5d)

That is, the branch pipe of the present invention thus formed can be supplied with the refrigerant without using the "Y" -shaped branch pipe body as in the prior art.

110: Branch tube 112: Entry connector
114: first exhaust connection pipe 116: second refrigerant outlet pipe
118: second exhaust connection pipe 150: copper pipe
160: mold frame 162: molded core
170: Left Actual Punch 180: Right Actual Punch

Claims (3)

A method of forming a branch tube for installing an air conditioner utilizing a hydroforming method for distributing and supplying refrigerant to use,
A mold pipe 160 is inserted into a pipe 150 corresponding to a first discharge pipe 114 integrally formed on one side of the entrance pipe 112, (S1) of inserting the left and right actuator punches (170, 180) at both ends of the pipe (150);
A pre-pressurization step of supplying a fluid to the left and right actuator punches 170 and 180 inserted at both ends of the copper pipe 150 to apply a pressure to the inside of the copper pipe 150 at a constant pressure of 0.3 to 0.5 MPa S2);
The left and right manual punches 170 and 180 are moved forward to enter the center of the copper pipe 150 and simultaneously the right and left manual punches 170 and 180 are connected to the left and right manual punches 170 and 180, 174 and 184 to rapidly inflate the outer surface of the copper pipe 150 to supply the molding fluid to the left and right actuator punches 170 and 180, (S3) of 200 to 300 MPa pressure to integrally form the second refrigerant discharge pipe (116) having a shape corresponding to the core (162);
And a joining step (S4) in which the second discharge connection pipe (118) is welded to the second refrigerant discharge pipe (116) formed in the booster step (S3), using the hydroforming method Method of forming branch tube for air conditioner installation. The method according to claim 1,
Stepped portions 176 and 186 are formed on the left and right actuator punches 170 and 180 so that the left and right actuator punches 170 and 180 are positioned on the right and left sides of the copper pipe 150, the first and second pipes 150 and 150 are closely adhered to both ends of the copper pipe 150 to press the copper pipe 150, thereby forming the copper pipe 150 in a uniform thickness while keeping the thickness of the copper pipe 150 constant. And a second refrigerant discharge pipe (116) having a shape corresponding to the core (162) is formed.
A branch pipe for installing an air conditioner utilizing a hydroforming method for distributing and supplying a refrigerant to a user,
An inlet connection pipe 112 having a refrigerant inlet passage 112a for entering refrigerant;
A first discharge connection pipe 114 formed integrally with the inlet connection pipe 112 and having a first refrigerant discharge passage 114 for discharging the refrigerant introduced through the refrigerant inlet passage 112a to the user, ;
A second refrigerant discharge pipe (116) integrally formed between the inlet connection pipe (112) and the first discharge connection pipe (114);
A second refrigerant discharge passage 118a for discharging the refrigerant entering the refrigerant inlet passage 112a of the inlet connection pipe 112 to the user is formed in the inside of the second refrigerant discharge pipe 116 And a second discharge connection pipe (118).



KR1020130053706A 2013-05-13 2013-05-13 Hydroforming method of molding hydro forming KR20140134356A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105290195A (en) * 2015-06-19 2016-02-03 新昌县航达机械制造有限公司 Locking rigid-plastic compound bulging forming apparatus for large-caliber three-way pipes
KR20160149349A (en) 2015-06-17 2016-12-28 삼원동관 주식회사 Hydroforming count punch apparatus
KR20170002096U (en) 2017-03-06 2017-06-14 삼원동관 주식회사 Apparatus of molding for branch type pipe, method of molding for branch type pipe and branch type thereof
KR20170003177U (en) 2017-05-22 2017-09-12 삼원동관 주식회사 Apparatus of molding for branch type pipe, method of molding for branch type pipe and branch type thereof
KR20200085028A (en) 2019-01-04 2020-07-14 주식회사 우성테크원 Connect pipe for system airconditioner
KR20200085027A (en) 2019-01-04 2020-07-14 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner
KR102145366B1 (en) 2020-01-22 2020-08-19 알텍 주식회사 Branch pipe for system air conditioner and welding method
KR102222735B1 (en) 2020-07-29 2021-03-04 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner
KR102222743B1 (en) 2020-07-29 2021-03-04 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner
KR102404444B1 (en) 2021-09-07 2022-06-02 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner
US11821458B2 (en) 2017-07-21 2023-11-21 Daikin Industries, Ltd. Refrigerant-channel branching component, and refrigeration apparatus including refrigerant-channel branching component

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160149349A (en) 2015-06-17 2016-12-28 삼원동관 주식회사 Hydroforming count punch apparatus
CN105290195A (en) * 2015-06-19 2016-02-03 新昌县航达机械制造有限公司 Locking rigid-plastic compound bulging forming apparatus for large-caliber three-way pipes
KR20170002096U (en) 2017-03-06 2017-06-14 삼원동관 주식회사 Apparatus of molding for branch type pipe, method of molding for branch type pipe and branch type thereof
KR20170003177U (en) 2017-05-22 2017-09-12 삼원동관 주식회사 Apparatus of molding for branch type pipe, method of molding for branch type pipe and branch type thereof
US11821458B2 (en) 2017-07-21 2023-11-21 Daikin Industries, Ltd. Refrigerant-channel branching component, and refrigeration apparatus including refrigerant-channel branching component
KR20200085028A (en) 2019-01-04 2020-07-14 주식회사 우성테크원 Connect pipe for system airconditioner
KR20200085027A (en) 2019-01-04 2020-07-14 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner
KR102145366B1 (en) 2020-01-22 2020-08-19 알텍 주식회사 Branch pipe for system air conditioner and welding method
KR102222735B1 (en) 2020-07-29 2021-03-04 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner
KR102222743B1 (en) 2020-07-29 2021-03-04 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner
KR102404444B1 (en) 2021-09-07 2022-06-02 주식회사 우성테크원 Connect pipe manufacturing method for system airconditioner

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