KR100674716B1 - Plastic heat exchanger and the joining method therefor - Google Patents

Abstract

A plastic heat exchanger and a joining method thereof are provided to improve productivity of a plastic exchanger by reducing a cooling pipe inserting process. In a plastic heat exchanger, two separate cooling pipes laterally continue in an upper plate(110) and a lower plate(120). An upper header(112) and a lower header(122) are installed on both ends of the upper plate and a lower plate. An upper fusion part(114) and a lower fusion part(124) connect two separate cooling pipes. A protrusion(116) is installed on the upper fusion part. A recession(126) is installed on the upper fusion part. The protrusion and the recession are melted and coupled by a friction force. And, the plastic heat exchanger is made of a thermal conductive resin. More particularly, the thermal conductive resin is made of a PBT(Poly Butylene Terephthalate) to have a short forming time and an excellent chemical resistance property with a rapid crystallization speed.

Description

Plastic heat exchanger and the joining method therefor}

1 is a perspective view showing that a diameter maintaining jig is inserted into a refrigerant pipe of a conventional plastic heat exchanger.

Figure 2 is a perspective view showing that the diameter maintaining jig is extracted after the header is injected into the refrigerant pipe of the conventional heat exchanger plastic.

3 is a perspective view of a plastic heat exchanger according to the present invention.

4 is an exploded perspective view of a refrigerant pipe according to the present invention.

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view showing a state in which the refrigerant pipe according to the present invention is bonded.

7 is a flow chart showing the working process of the plastic heat exchanger according to the present invention.

Explanation of symbols on main parts of drawing

10: refrigerant pipe 20: header

30: diameter maintaining jig 32: insertion rod

100: plastic heat exchanger 101: refrigerant tube

102: upper refrigerant pipe 103: header

104: lower refrigerant pipe 110: upper plate

112: upper header 114: upper fusion

116: protrusion 120: lower plate

122: lower header 124: lower fusion

126: depression 130: fusion

The present invention relates to a plastic heat exchanger, and more particularly, a plurality of refrigerant pipes are formed by dividing the upper plate and the lower plate and integrally forming a header on the upper plate and the lower plate, thereby attaching the upper plate and the lower plate by vibrating heat fusion. It relates to a tube group header and a joining method of a plastic heat exchanger that can overcome the incomplete bonding between the refrigerant tube group and the header.

The refrigerant pipe of the heat exchanger is for endothermic and heat dissipation, and in recent years, the refrigerant pipe is being replaced by a synthetic resin such as plastic, which reduces the molding and manufacturing costs. The plastic heat exchanger has a header formed at both ends of the refrigerant pipe through which the refrigerant flows, and a refrigerant inlet tube and a refrigerant outlet tube are provided at one side of the header. In order to manufacture the conventional plastic heat exchanger as described above, a plurality of extruded refrigerant tubes are fixed to the header by double injection. This will be described based on FIG. 1 and FIG. 2 to examine this in more detail.

1 is a perspective view showing that a diameter maintaining jig is inserted into a refrigerant pipe of a conventional plastic heat exchanger. Referring to the drawings, the refrigerant pipe 10 has a hollow pipe shape to allow the refrigerant to flow, and a plurality of refrigerant pipes 10 are collected and fixed to the header 20. To this end, the plurality of refrigerant pipes 10 maintains a constant interval, and requires a diameter maintaining jig 30 so that the movement path of the refrigerant is not blocked. The diameter maintaining jig 30 is provided with a plurality of insertion rods 32, the insertion rod 32 is inserted into the refrigerant pipe 10, the header 20 is the outer diameter of the refrigerant pipe 10 is 2 It is molded by injection.

Figure 2 is a perspective view showing that the diameter maintaining jig is extracted after the header is injected into the refrigerant pipe of the conventional heat exchanger plastic. Referring to the drawings, when the header 20 is molded to the outer diameter of the aggregated refrigerant pipe 10, the outer diameter and the header 20 of the refrigerant pipe 10 are fixed. The refrigerant pipe 10 and the header are fixed. A high frequency fusion machine is used to fix the 20. The high frequency fusion splicer has a header 20 having the same material as that of the plastic refrigerant tube 10 and makes contact with the refrigerant tube 10 and the header 20 by flowing a high frequency for a predetermined time to the contact surface contacting the refrigerant tube 10. The melted parts are melted and pressed to fix them. Thereafter, the insertion rod 32 of the diameter retaining jig 30 is extracted from the refrigerant pipe 10.

However, since the insertion rod 32 of the diameter-retaining jig 30 is deformed, the circular shape is crushed, or the refrigerant pipe 10 and the header 20 are not squeezed smoothly, so that only one of the refrigerant pipes 10 is provided. When the thermal fusion of the refrigerant pipe 10 and the header 20 of the refrigerant is unstable, leakage occurs between the gap between the refrigerant pipe 10 and the header 20, not only decreases the efficiency of the plastic heat exchanger, There is a problem in that the refrigerant must be injected from time to time to replenish the leaked refrigerant.

In addition, since each refrigerant pipe 10 is to be inserted into the insertion rod 32 of the diameter-retaining jig 30, the time required for the work process is reduced, and the production rate decreases.

The present invention has been made to solve the above problems, and an object thereof is to provide an airtight plastic heat exchanger in which no leakage occurs between the refrigerant pipe group and the gap between the header.

In addition, by simplifying the work process by reducing the number of unnecessary processes generated in the bonding process of the header and the refrigerant pipe of the plastic heat exchanger, to provide a plastic heat exchanger bonding method that can improve the production rate of the plastic heat exchanger. There is a purpose.

According to the technical idea of the present invention for achieving the above object, the upper plate and the lower plate that the refrigerant pipe divided into two up and down in the lateral direction, the upper header and the lower header provided on both side ends of the upper plate and the lower plate, An upper fusion unit and a lower fusion unit connecting the bisected refrigerant tube and the refrigerant tube are achieved by a plastic heat exchanger.

Here, it is preferable to further include a protrusion provided in the upper fusion portion, and a depression provided in the lower fusion portion corresponding to the protrusion.

And, the plastic heat exchanger is preferably made of a thermally conductive resin.

On the other hand, in another technical idea of the present invention for achieving the above object, the upper plate injection step of injection molding the upper header integrally at both ends of the upper plate is bisected refrigerant pipe continuous, and the refrigerant pipe of the upper plate A lower half injection step in which the lower header is integrally injection molded at both ends of the lower plate where the corresponding bisected refrigerant tube is continuous, and a welding step in which the upper plate and the lower plate are joined at the fusion machine is achieved by the joining method of the plastic heat exchanger. do.

Here, it is preferable to further include a lower plate fixing step for fixing the lower plate obtained in the lower plate injection step to the fixing jig of the high frequency fusion machine.

In addition, it is preferable that the top plate is seated on the top of the lower plate further comprises a top plate mounting step of the excitation portion of the high frequency fusion machine is located in the upper fusion portion of the top plate.

In addition, after the lower plate fixing step and the upper plate seating step, the excitation portion of the high frequency fusion machine to generate a vibration is preferably further comprises a fusion step that the upper fusion portion and the lower fusion portion is melted by friction and bonded to each other.

In addition, it is preferable that the upper plate and the lower plate are joined by vibration thermal fusion.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In the description of the present invention, the same reference numerals will be given to the same parts as the conventional configurations.

3 is a perspective view of a plastic heat exchanger according to the present invention, Figure 4 is an exploded perspective view of a refrigerant pipe according to the present invention. Referring to the drawings, the plastic heat exchanger 100 is composed of a large upper plate 110 and a lower plate 120, the upper plate 110 is a continuous bisected refrigerant pipe 101 and the refrigerant pipe The upper header 112 and the lower header 122 bisected at both ends of the 101 are formed. The refrigerant pipe 101 has a hollow pipe shape to allow the refrigerant to flow therein and is bisected into an upper refrigerant pipe 102 and a lower refrigerant pipe 104 up and down around the hollow to form an upper plate 110 and a lower plate 120. Is provided continuously in the lateral direction.

In addition, the lower plate 120, like the upper plate 120, has a bisected lower refrigerant pipe 104 corresponding to the upper refrigerant pipe 102 and the upper header 112 of the upper plate 110, and a lower header 122. Is formed. Meanwhile, a fusion unit 130 is formed between the upper refrigerant pipe 102 and the lower refrigerant pipe 104 which extend in the lateral direction of the upper plate 110 and the lower plate 120 to form the upper fusion unit 114 and the lower portion. Fusion portion 124 is formed. The upper fusion portion 114 and the lower fusion portion 124 is provided with a protrusion 116 having a shape protruding from the upper fusion portion 114 so as to correspond to each other, the recessed portion (124) 126 is provided to have a shape that is roughly coupled. The protrusion 116 and the recessed portion 126 are formed in the lengthwise direction of the upper fusion portion 114 and the lower fusion portion 124, respectively, and extend to the upper header 112 and the lower header 122.

As described above, the plastic heat exchanger 100 including the upper plate 110 and the lower plate 120 is formed by bonding the upper plate 110 and the lower plate 120 to each other, as shown in FIG. 5. The upper coolant tube 102 of the 110 and the lower coolant tube 104 of the lower plate 120 are joined to each other to form a coolant tube 101 having a flow path through which the coolant flows.

5 is a cross-sectional view taken along the line A-A of Figure 4, Figure 6 is a cross-sectional view showing a state in which the refrigerant pipe according to the present invention is bonded. Referring to the drawings, the plastic heat exchanger 100 is composed of a plurality of refrigerant pipes 101 through which a refrigerant flows, and a header 103 provided at both ends of the refrigerant pipe 101. Headers are integrally formed at both ends of the refrigerant pipe 101, and the refrigerant pipe 101 and the refrigerant pipe 101 are connected to the fusion unit 130.

The plastic heat exchanger 100 configured as described above is formed by dividing the center of the flow path through which the refrigerant flows, and is formed of the upper plate 110 and the lower plate 120, and the upper plate 110 is the refrigerant pipe as described above. An upper fusion portion 114 connecting the upper refrigerant pipe 102 into which the 101 is divided into two and the continuous upper refrigerant pipe 102 and an upper header 112 integrally formed at both ends of the upper refrigerant pipe 102. The lower plate 120 includes a lower fusion unit 124 connecting the lower refrigerant pipe 104 into which the refrigerant pipe 101 is bisected and the continuous lower refrigerant pipe 104, and a lower refrigerant pipe 104. It consists of a lower header 122 formed integrally at both ends of the).

Bonding of the upper refrigerant pipe 102 of the upper plate 100 and the lower refrigerant pipe 104 of the lower plate 120 and the upper header 112 and the lower header 122 of the plastic heat exchanger 100 configured as described above is , The upper fusion portion 114 and the lower fusion portion 124 connecting the bisected refrigerant pipe and the refrigerant pipe, the protrusion 116 of the upper fusion portion 114 is a depression of the lower fusion portion 124 The protrusion 116 and the depression 126 in the state in which the 126 is in close contact with each other, the vibration of the high frequency fusion machine (not shown) generates vibration, so that the protrusion 116 of the upper fusion portion 114 melts by friction. The recessed portion 126 of the lower fusion portion 124 is joined to maintain airtightness.

In addition, the plastic heat exchanger 100 of the upper plate 110 and the lower plate 120 is made of a thermally conductive resin, the thermally conductive resin is good heat, but will have a formability or strength, such as plastic, In particular, the thermally conductive resin is made of poly butylene terephthalate (PBT), has a high crystallization rate, short molding time, and excellent chemical resistance.

Therefore, the coolant tube 101 of the plastic heat exchanger 100 is formed in a group, and the fusion unit 130 connects the coolant tube 101 and the coolant tube 101 to the coolant tube ( Since the header 103 located at both ends of the 101 is integrally formed, it is possible to completely prevent leakage of the separate header and the refrigerant pipe configured to be manufactured by the conventional double injection.

On the other hand, the plastic heat exchanger 100 as described above is composed of the upper plate 110 and the lower plate 120, the fusion unit 130, the bisected refrigerant tube 101 and the refrigerant tube 101 formed integrally with the header 103 ) Is connected, and in order to join the protrusion 116 and the depression 126 of the upper fusion portion 114 and the lower fusion portion 124 of the fusion portion 130, the upper plate injection step (S10) and , The lower plate injection step (S20) and the fusion step (S50) is made.

To this end, the plastic heat exchanger 100, the upper refrigerant pipe 102 is bisected the upper refrigerant pipe 102 is a continuous upper plate 110 and the upper header 112 is provided at both ends of the upper plate 110. And the upper plate injection step S10 in which the upper fusion unit 114 connecting the upper refrigerant pipe 102 and the upper refrigerant pipe 102 is integrally injection molded, and the upper refrigerant pipe of the upper plate injection step S10 ( The lower coolant tube 104 corresponding to the lower coolant tube 104 and the lower header 122 and the lower coolant tube 104 and the lower coolant tube 104 provided on both sides of the lower plate 120 are connected. The lower fusion unit 124 to be connected is preceded by a lower plate injection step (S20) that is integrally injection molded.

And, the lower plate fixing step (S30) for fixing the lower plate 120 obtained in the lower plate injection step (S20) to a fixing jig (not shown) of the high frequency fusion machine in order to fusion between the upper plate and the lower plate obtained through the above steps, The upper plate 110 is seated above the lower plate 120, and an upper plate seating step (S40) in which an excitation part (not shown) of the high frequency fusion machine is located at the upper fusion part 114 of the upper plate 110. After the lower plate fixing step (S30) and the upper plate seating step (S40), the excitation part of the high frequency fusion machine generates a vibration so that the upper fusion unit 114 and the lower fusion unit 124 are melted by friction and bonded to each other (S50). By being made, it is possible to maintain the airtight bonding of the upper plate 110 and the lower plate 120.

According to the joining method of the plastic heat exchanger as described above, the gap between the refrigerant pipe and the refrigerant pipe is maintained by the fusion unit without the conventional diameter maintenance jig for maintaining a constant distance between the refrigerant pipe and the cooling tube. The process of inserting the refrigerant pipe into the insertion rod is unnecessary, thereby reducing the number of work steps. In addition, since the protrusions and the depressions are in close contact with each other by the heat generated by the vibration because the protrusions and the depressions are in close contact with each other, the leakage of the refrigerant may be prevented because the source of the conventional insertion rod and the refrigerant pipe do not match. It becomes possible.

Plastic heat exchanger according to the present invention and the joining method, the upper header and the lower header is integrally formed at both ends of the bisected refrigerant tube, and the bisected refrigerant tube and the refrigerant tube by the upper fusion portion and the lower fusion portion It is possible to provide a plastic heat exchanger in which airtightness is maintained without leakage between the refrigerant pipe group and the header.

In addition, since the conventional diameter maintenance jig is not required in the joining process of the header of the plastic heat exchanger and the refrigerant pipe, the process of inserting the refrigerant pipe into the insertion rod of the diameter maintenance jig is reduced, thereby simplifying the work process. There is an effect that can improve the production rate of the heat exchanger.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea that such modifications and variations are also included in the claims Should be seen.

Claims (8)

An upper plate and a lower plate having a refrigerant pipe divided into two vertically and laterally; An upper header and a lower header provided at both ends of the upper plate and the lower plate; An upper fusion portion and a lower fusion portion connecting the bisected refrigerant pipe and the refrigerant pipe; A protruding portion provided in the upper fusion portion and a depression provided in the lower fusion portion; And Plastic heat exchanger characterized in that the projecting portion of the upper fusion portion and the lower fusion portion connecting the bisected refrigerant tube and the refrigerant tube and the projection portion and the depression portion by the vibration of the excitation portion of the high frequency fusion splicer is melted by friction and joined to each other. . delete The method of claim 1, The plastic heat exchanger, characterized in that made of a heat conductive resin. A top plate injection step in which an upper header is integrally injection molded at both ends of the top plate in which a bisected refrigerant tube is continuous; A lower plate injection step in which a lower header is integrally injection molded at both ends of a lower plate in which a bisected refrigerant tube corresponding to the refrigerant pipe of the upper plate is continuous; A lower plate fixing step of fixing the lower plate obtained in the lower plate injection step to the fixing jig of the high frequency welding machine; The upper plate seating step is seated on the upper portion of the lower plate, the upper plate mounting step of the excitation portion of the high frequency welder is located in the upper fusion portion of the upper plate: And a fusion step in which the excitation portion of the high frequency fusion machine generates vibration after the lower plate fixing step and the upper plate mounting step, so that the upper fusion part and the lower fusion part are melted by friction and bonded to each other. delete delete delete The method of claim 4, wherein Bonding method of the plastic heat exchanger, characterized in that the upper plate and the lower plate is bonded by vibrating heat welding.

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