Guide needle for insertion of heat exchanger copper pipe in refrigeration field

Abstract

The invention provides a guide needle for insertion of a heat exchanger copper pipe in the refrigeration field. The guide needle comprises an insertion part, a guide part and a butt joint part which are arranged in sequence. The maximum outer diameter of the guide part is larger than the outer diameter of the copper pipe and smaller than the inner diameter of the fin channel. According to the guide needle for insertion of the heat exchanger copper pipe in the refrigeration field, the guide part is arranged, and the guide needle obtains resistance of proper magnitude in a fin channel by setting the maximum outer diameter of the guide part, so that smooth guide is guaranteed, and the guide needle is prevented from falling off from the copper pipe.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment manufacturing, in particular to a guide needle used for inserting a copper tube of a heat exchanger in the refrigeration field. Background Art

[0002] Air conditioner is a common refrigeration equipment, and heat exchanger is an important part of air conditioner. Heat exchanger generally includes several parallel fins and copper tubes passing through the fins. Heat exchange medium, such as Freon, flows through the copper tubes. The heat exchange medium exchanges heat with the outside world through the fins to achieve the purpose of heat exchange.

[0003] During the manufacturing process of the heat exchanger, the fins need to be punched, and then several fins are stacked. The holes of the fins form fin channels, and then the copper tubes are passed through the fin channels. Chinese invention patent CN117260220B discloses a copper tube guide insertion system, in which a guide needle is inserted into the channel of the fin, and then the copper tube is inserted into the fin channel behind the guide needle. However, when the guide needle passes through the fin channel, there will be a blockage or the guide needle and the copper tube will fall off, which affects the processing efficiency. Summary of the invention

[0004] The present invention provides a guide pin for inserting a copper tube of a heat exchanger in the refrigeration field, so as to solve the above problem.

[0005] A guide pin for inserting a copper tube of a heat exchanger in the field of refrigeration, comprising an inserting portion, a guiding portion and a docking portion which are arranged in sequence, wherein the inserting portion is used to be inserted into a fin channel, and the docking portion is used to dock with the copper tube;

[0006] The maximum outer diameter of the guide portion is larger than the outer diameter of the copper tube and smaller than the inner diameter of the fin channel.

[0007] Furthermore, the guide portion includes a first guide segment and a second guide segment, the first guide segment and the second guide segment are coaxially arranged columnar structures with equal diameters, the first guide segment and the second guide segment are respectively arranged at two ends of the guide portion, and the diameter of the first guide segment is the maximum outer diameter of the guide portion.

[0008] Furthermore, the sum of the length of the first guide segment and the length of the second guide segment accounts for 30%-70% of the length of the guide portion.

[0009] Furthermore, the difference between the maximum outer diameter of the guide portion and the inner diameter of the fin channel is 0.01-0.1.

[0010] Furthermore, a buffer section and a transition section are provided between the first guide section and the second guide section, the diameter of the buffer section is smaller than the diameter of the first guide section, one end of the transition section is connected to the buffer section, and the other end is connected to the second guide section, and the diameter of the transition section gradually increases from one end to the other end.

[0011] Furthermore, the docking portion includes a matching section and a connecting section, the matching section is connected to the guide portion and can match with the copper tube so that the copper tube abuts against the guide portion, and the connecting section gradually decreases in diameter.

[0012] Furthermore, the length of the insertion portion accounts for 40%-60% of the length of the guide needle.

[0013] Furthermore, the diameter of the inserting portion gradually decreases from one end close to the guiding portion to the other end, and the taper angle of the inserting portion is 5°-15°.

[0014] The invention discloses a guide needle for inserting a copper tube of a heat exchanger in the refrigeration field. The guide portion is provided. By setting the maximum outer diameter of the guide portion, the guide needle obtains a suitable resistance in a fin channel, which ensures smooth guidance and prevents the guide needle from falling off from the copper tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a guide needle for inserting a copper tube of a heat exchanger in the refrigeration field disclosed in an embodiment of the present invention;

[0017] Figure 2 This is a structural front view of a guide pin for inserting a copper tube of a heat exchanger in the refrigeration field disclosed in an embodiment of the present invention;

[0018] Figure 3 It is a schematic diagram of the use state of the guide needle disclosed in the embodiment of the present invention;

[0019] Figure 4 It is a cross-sectional schematic diagram of a state where a guide needle disclosed in an embodiment of the present invention is inserted into a fin channel;

[0020] Figure 5 It is a cross-sectional schematic diagram of a state in which a guide needle guides a copper tube to be inserted into a fin channel disclosed in an embodiment of the present invention;

[0021] In the figure: 1. Insertion part; 2. Guide part; 21. First guide section; 22. Second guide section; 23. Buffer section; 24. Transition section; 3. Butt joint; 31. Matching section; 32. Leading section; 4. Fin; 41. Fin channel; 5. Copper tube. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1-Figure 5 As shown, this embodiment discloses a guide needle for inserting a copper tube of a heat exchanger in the refrigeration field, such as Figure 1 As shown, it comprises an inserting portion 1, a guiding portion 2 and a docking portion 3 which are arranged in sequence; the inserting portion 1 is used to be inserted into the fin channel, and the docking portion is used to dock with the copper tube;

[0024] When the guide needle passes through the fin channel, there will be a blockage or the guide needle and the copper tube will fall off, affecting the processing efficiency. Since the size of the copper tube is close to the size of the fin channel, in order to achieve the guiding function, the outer diameter of the guide needle is also close to the inner diameter of the fin channel. The closer the outer diameter of the guide needle is to the inner diameter of the fin channel, the better the guiding effect of the guide needle. At the same time, when the guide needle passes through the fin channel, there will be a certain friction, which will hinder the movement of the guide needle; the closer the outer diameter of the guide needle is to the inner diameter of the fin channel, the greater the friction, the slower the insertion speed of the copper tube, and the lower the assembly efficiency. The greater the difference between the outer diameter of the guide needle and the inner diameter of the fin channel, the smaller the friction, and the smoother the insertion of the copper tube, but the greater the risk of the copper tube and the guide needle falling off. If the guide needle falls off, the guiding effect will not be achieved.

[0025] There is no relevant research on guide needles in the prior art, and it is unclear why the guide needles fall off or become blocked, and the relationship between this phenomenon and the diameter of the guide needles. Through the creative work of the applicant, a technical solution to the problem of guide needles falling off or becoming blocked was obtained.

[0026] In this embodiment, the maximum outer diameter of the guide portion 2 is larger than the outer diameter of the copper tube 5 and smaller than the inner diameter of the fin channel 41 .

[0027] The size of the copper tube is close to that of the fin channel. In order to obtain a better guiding effect and prevent the guide needle from falling off or being blocked, the maximum outer diameter of the guide part is the maximum outer diameter of the guide needle, which is smaller than the inner diameter of the fin channel. During the guidance, there is a gap between the guide part and the fin channel to ensure the smooth insertion of the guide part. At the same time, the diameter of the guide part is larger than the outer diameter of the copper tube, so that the resistance of the guide part is greater than the resistance of the copper tube, thus preventing the guide needle and the copper tube from falling off.

[0028] In this embodiment, the guide portion 2 includes a first guide segment 21 and a second guide segment 22. The first guide segment 21 and the second guide segment 22 are coaxially arranged columnar structures with equal diameters. The first guide segment 21 and the second guide segment 22 are respectively arranged at two ends of the guide portion 2. The diameter of the first guide segment 21 is the maximum outer diameter of the guide portion 2.

[0029] The first guide section 21 is connected to the insertion part 1, and the second guide section 22 is connected to the docking part 3. The first guide section 21 and the second guide section 22 jointly complete the guiding function. The first guide section 21 and the second guide section 22 are respectively located at the two ends of the guide part 2, which can increase the overall length of the guide part and better complete the guiding function. The resistance of the entire guide part can also be adjusted by setting the length of the first guide section and the second guide section to avoid excessive resistance, causing blockage, or too little resistance, causing the guide needle and the copper tube to fall off.

[0030] In this embodiment, the sum of the length of the first guide section 21 and the length of the second guide section 22 accounts for 30%-70% of the length of the guide portion. The lengths of the first guide portion and the second guide portion can be set separately. In this embodiment, the length of the first guide section 21 is 2.25 times the length of the second guide section 22. The length of the first guide section 21 is relatively large, which is conducive to the smooth guidance of the guide needle in the initial stage of guidance, and adjusts the slight position deviation between the fins, so that the fin channel is more conducive to the copper tube passing through.

[0031] In this embodiment, the difference between the maximum outer diameter of the guide portion 2 and the inner diameter of the fin channel 41 is 0.01-0.1. After the applicant's research on production conditions and force analysis of the insertion action, the guide portion within this range can obtain the best guiding effect, which can not only facilitate smooth insertion, but also prevent the guide pin from falling off, ensuring efficient assembly.

[0032] In this embodiment, a buffer section 23 and a transition section 24 are provided between the first guide section 21 and the second guide section 22. The diameter of the buffer section 23 is smaller than the diameter of the first guide section 21. One end of the transition section 24 is connected to the buffer section 23, and the other end is connected to the second guide section 22. The diameter of the transition section 24 gradually increases from one end to the other end. Specifically, the diameter of the transition section gradually increases from one end close to the buffer section to the end close to the second guide section 22.

[0033] The diameter of the buffer section 23 is smaller than the diameter of the first guide section 21. In the process of passing through the fin channel, the buffer section hardly contacts the fin, so the buffer section hardly generates resistance. At the same time, the diameter of the buffer section is small, which makes it easier for the clamping tool to clamp the buffer section of the guide needle after the guide needle passes through the fin channel, so that the guide needle leaves the fin channel. The diameter of the transition section 24 gradually increases, so that after the fin loses its guiding function in the buffer section, the fin gradually starts to contact the fin in the transition section, gradually plays a guiding role, and the diameter gradually increases to prevent the fin from being damaged.

[0034] In this embodiment, the docking portion 3 includes a matching section 31 and a connecting section 32. The matching section 31 is connected to the guide portion 2 and can match with the copper tube 5 so that the copper tube 5 abuts against the guide portion 2. The connecting section 32 gradually decreases in diameter.

[0035] The diameter of the matching section 31 is smaller than the outer diameter of the copper tube. The copper tube is guided by the connecting section, sleeved on the outside of the matching section 31 and abutted against the guide portion 2, specifically, abutted against the second guide section 22. The outer diameter of the copper tube is smaller than the diameter of the second guide section 22, so the edge of the copper tube will not directly contact the fin, thereby avoiding damage to the fin or the copper tube.

[0036] In this embodiment, the length of the insertion portion 1 accounts for 40%-60% of the length of the guide needle.

[0037] The diameter of the inserting portion 1 gradually decreases from one end close to the guiding portion 2 to the other end, and the cone angle of the inserting portion 1 is 5°-15°.

[0038] The longer the insertion portion is, the smaller the cone angle is, the gentler the insertion of the guide needle into the fin channel is, and the smoother the insertion is. However, the longer the insertion portion is, the longer the insertion stroke is, and the lower the processing efficiency is. The range of the guide needle length and the cone angle in this embodiment ensures both smooth insertion and efficient processing as much as possible.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A guide needle for inserting a copper tube of a heat exchanger in the refrigeration field, characterized in that: It comprises an inserting portion (1), a guiding portion (2) and a docking portion (3) which are arranged in sequence, wherein the inserting portion (1) is used to be inserted into a fin channel (41), and the docking portion (3) is used to be docked with a copper tube (5); The maximum outer diameter of the guide portion (2) is greater than the outer diameter of the copper tube (5) and smaller than the inner diameter of the fin channel (41).

2. A guide needle for inserting a copper tube of a heat exchanger in the refrigeration field according to claim 1, characterized in that: The guide portion (2) comprises a first guide section (21) and a second guide section (22); the first guide section (21) and the second guide section (22) are coaxially arranged columnar structures with equal diameters; the first guide section (21) and the second guide section (22) are respectively arranged at two ends of the guide portion (2); the diameter of the first guide section (21) is the maximum outer diameter of the guide portion (2).

3. A guide needle for inserting a copper tube of a heat exchanger in the refrigeration field according to claim 2, characterized in that: The sum of the length of the first guide section (21) and the length of the second guide section (22) accounts for 30% to 70% of the length of the guide portion.

4. The guide needle for inserting a copper tube of a heat exchanger in the refrigeration field according to claim 1, characterized in that: The difference between the maximum outer diameter of the guide portion (2) and the inner diameter of the fin channel (41) is 0.01-0.

1.

5. The guide needle for inserting a copper tube of a heat exchanger in the refrigeration field according to claim 2, characterized in that: A buffer section (23) and a transition section (24) are provided between the first guide section (21) and the second guide section (22); the diameter of the buffer section (23) is smaller than the diameter of the first guide section (21); one end of the transition section (24) is connected to the buffer section (23) and the other end is connected to the second guide section (22); and the diameter of the transition section (24) gradually increases from one end to the other end.

6. The guide needle for inserting a copper tube of a heat exchanger in the refrigeration field according to claim 1, characterized in that: The docking portion (3) comprises a matching section (31) and a connecting section (32); the matching section (31) is connected to the guide portion (2) and can match with the copper tube (5) so that the copper tube (5) abuts against the guide portion (2); and the connecting section (32) gradually decreases in diameter.

7. The guide needle for inserting a copper tube of a heat exchanger in the refrigeration field according to claim 1, characterized in that: The length of the insertion portion (1) accounts for 40%-60% of the length of the guide needle.

8. The guide needle for inserting a copper tube of a heat exchanger in the refrigeration field according to claim 1, characterized in that: The diameter of the insertion portion (1) gradually decreases from one end close to the guide portion (2) to the other end, and the cone angle of the insertion portion (1) is 5°-15°.

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