A guide needle and a tube passing device

Abstract

The utility model discloses a guide needle and pipe penetrating device, the needle body at least includes along the needle body from the head end to the tail end direction arrangement in proper order: first needle body section, its maximum outer diameter is less than copper pipe inner diameter and fin hole inner diameter, transition section is connected with first needle body section, its maximum outer diameter is greater than copper pipe inner diameter and is less than fin hole inner diameter, when the needle body moves along the first direction, it drives first needle body section to pass through fin hole in proper order, inserts to copper pipe inside and is arranged in copper pipe mouth through transition section, when the needle body moves along the second direction, it makes first needle body section and copper pipe in copper pipe through cooperation with the first drive unit of drive copper pipe movement and move along the second direction and insert into fin hole and install to the situation of avoiding the copper pipe rigidity and straightness deficiency leading to pipe penetrating bending and damaging heat exchanger from happening.

Description

Technical Field

[0001] This utility model relates to a pipe-insertion device for air conditioners, specifically to a guide needle and a pipe-insertion device structure having the guide needle. Background Technology

[0002] Air conditioning is short for "air conditioner". The condenser and evaporator are among the core components of an air conditioner.

[0003] Condensers and evaporators are both heat exchangers used for heat exchange. A heat exchanger mainly consists of multiple fins arranged side by side and copper tubes inserted through the fins. Fin holes are provided on the fins. During the production and processing of the heat exchanger, multiple rows of copper tubes need to be inserted into the fin holes on the fins.

[0004] The speed at which copper tubes are threaded directly affects the production speed of the condenser and evaporator.

[0005] Currently, there are two methods for inserting copper tubes in the production process of heat exchangers: manual and mechanical. Manually inserting copper tubes into the condenser or evaporator has a low degree of automation and consumes a lot of manpower; With continuous development, mechanized tube insertion devices have emerged for tube insertion. However, due to insufficient straightness and rigidity of the copper tubes, mechanical tube insertion can cause the copper tubes to bend during the insertion process, puncturing the condenser and evaporator, resulting in losses, and even causing further damage to the entire tube insertion machine system, increasing repair costs. Utility Model Content

[0006] In view of the above-mentioned technical problems mentioned in the background art, a guide pin is proposed, which can be partially inserted into the inside of the copper tube during tube insertion. During tube insertion, the guide pin and the copper tube are moved together and inserted into the heat exchanger, which enhances the rigidity and straightness of the entire copper tube and avoids the situation of tube bending and heat exchanger damage caused by insufficient rigidity and straightness of the copper tube.

[0007] In some embodiments of this application, a guide pin is provided for guiding and inserting a copper tube into the fin holes of a heat exchanger, comprising: a pin body, wherein the pin body includes at least the following components arranged along the direction from the head end to the tail end of the pin body: The first needle body segment has a maximum outer diameter smaller than the inner diameter of the copper tube and the inner diameter of the fin hole; The transition section, which connects to the first needle body section, has a maximum outer diameter smaller than the inner diameter of the fin hole. When the needle moves along the first direction, it drives the first needle body segment to pass through the fin hole in sequence, insert into the copper tube, and be locked at the copper tube opening through the transition section so that the first needle body segment and the copper tube are connected. As the needle moves along the second direction, it cooperates with the first drive unit that drives the copper tube to move, causing the first needle segment and the copper tube located inside the copper tube to move along the second direction and be inserted into the fin hole.

[0008] The above embodiments have the following advantages and effects: In this embodiment, the guide pin has a first pin section with a maximum outer diameter smaller than the outer diameter of the copper tube and the fin hole of the heat exchanger, and a transition section with a maximum outer diameter smaller than the inner diameter of the fin hole. Before inserting the copper tube, the first pin section can be passed through the heat exchanger and then inserted into the copper tube. The transition section connected to the rear of the first pin section is engaged with the copper tube opening. During insertion, the first pin section and the copper tube can be inserted together into the fin hole of the heat exchanger. The first pin section built into the copper tube guides and enhances the relative rigidity of the copper tube and improves its straightness, ensuring the rigidity and straightness of the copper tube, increasing the success rate of insertion, and avoiding the situation where the heat exchanger is damaged due to insufficient rigidity and straightness of the copper tube during insertion.

[0009] In some embodiments of this application, the needle body includes: The second needle body segment is connected to the transition segment, and the outer diameter of the second needle body segment is larger than the inner diameter of the fin hole; During the insertion of the first needle body segment into the copper tube along the first direction, the second needle body segment is located in the fin hole of the heat exchanger to enlarge the inner diameter of the fin hole. As the needle body drives the first needle body segment and the copper tube to move along the second direction toward the direction close to the fin hole, at least part of the second needle body segment is inside the fin hole.

[0010] The above embodiments have the following advantages and effects: By using a second needle section with an outer diameter larger than the fin hole, the fin hole can be enlarged when the first needle section is inserted into the copper tube. When the copper tube and the first needle section move in opposite directions to pass through the tube, the needle section is built into the heat exchanger to improve the relative rigidity of the entire heat exchanger.

[0011] In some embodiments of this application, the needle body includes: The second needle body segment is connected to the transition segment, and the outer diameter of the second needle body segment is less than or equal to the inner diameter of the fin hole; As the needle body drives the first needle body segment and the copper tube to move along the second direction toward the direction close to the fin hole, at least part of the second needle body segment is inside the fin hole.

[0012] The above embodiments have the following advantages and effects: By using a second needle section with an outer diameter less than or equal to the fin hole, the relative rigidity of the entire heat exchanger can be improved when the first needle section is inserted into the copper tube and when the copper tube and the first needle section move in opposite directions to pass through the tube.

[0013] In some embodiments of this application, the needle body includes a third needle body segment connected to the second needle body segment, wherein the outer diameter of the third needle body segment is equal to or greater than the outer diameter of the second needle body segment.

[0014] In some embodiments of this application, the needle body includes: a needle head, the maximum outer diameter of which is smaller than the inner diameter of the fin hole and the inner diameter of the copper tube, the needle head being connected to the first needle body segment, and its outer diameter gradually increasing along the direction close to the first needle body segment.

[0015] The above embodiments have the following advantages and effects: The structure of setting the needle head so that its outer diameter is smaller as it gets closer to the tip of the guide needle and gradually increases as it gets closer to the body of the first needle is mainly because setting the outer diameter of the smaller end makes it easier for the guide needle to be inserted into the fin hole or copper tube, and the gradually changing outer diameter is used to guide the insertion.

[0016] In some embodiments of this application, the outer diameter of the transition section gradually increases along the direction close to the second needle body section, the transition section has a minimum outer diameter and a locking outer diameter whose outer diameter value is between the minimum outer diameter and the maximum outer diameter, the minimum outer diameter is less than or equal to the inner diameter of the copper tube, and the locking outer diameter is greater than the inner diameter of the copper tube.

[0017] The above embodiments have the following advantages and effects: The transition section is designed with a larger outer diameter closer to the second needle body section and a smaller outer diameter closer to the first needle body section. The minimum outer diameter is less than or equal to the inner diameter of the copper tube, and the locking outer diameter, which is between the maximum and minimum outer diameters, is greater than the outer diameter of the copper tube. This way, when the guide needle drives the first needle body section to be inserted into the copper tube, the transition section can also be partially inserted into the copper tube until the transition section moves to the locking outer diameter, that is, when the outer diameter of the transition section is greater than the inner diameter of the copper tube, it is locked and connected to the copper tube, ensuring that the transition section can be inserted and connected to the copper tube.

[0018] In some embodiments of this application, the sum of the length of the first needle body segment and the length of the needle head is less than the length of the copper tube; The length of the second needle segment is greater than the sum of the length of the heat exchanger and the distance between the heat exchanger and the copper tube; the length of the second needle segment is greater than the length of the first needle segment.

[0019] The above embodiments have the following advantages and effects: By setting the length of the first needle body segment and the needle head to be similar to the length of the copper tube, it can be ensured that the needle body is supported almost throughout the entire copper tube, which greatly improves the rigidity and straightness of the entire copper tube. With the support of the first needle body segment and the pillow part built into the copper tube, the copper tube can be smoothly and quickly threaded when inserting parts.

[0020] When the first needle body segment and needle head are inserted into the copper tube, the second needle body segment mainly moves within the fin holes of the heat exchanger to enlarge the fin holes. Setting the length of the second needle body segment to be greater than the sum of the length of the heat exchanger and the distance between the heat exchanger and the copper tube ensures that the second needle body segment can completely pass through the heat exchanger to enlarge all the fin holes in the heat exchanger, ensuring the consistency of the size of all the fin holes on the heat exchanger, and providing a guarantee for the subsequent copper tube insertion.

[0021] The first needle section is mainly used to insert into the copper tube to increase the rigidity of the copper tube, and the second needle section is used to insert into the heat exchanger to increase the rigidity of the heat exchanger. Therefore, the first needle section is set to be shorter than the second needle section to match the length of the copper tube, and the second needle section is set to be longer to match the length of the heat exchanger.

[0022] In some embodiments of this application, the second needle body segment is detachably connected to the first needle body segment, and multiple second needle body segments are provided, with different outer diameters for the multiple second needle body segments.

[0023] The above embodiments have the following advantages and effects: By configuring the second needle body segment into multiple different outer diameters and detachably connecting it to the first needle body segment, not only can the second needle body segment be easily disassembled and replaced, but it can also achieve modular design. In use, the second needle body segment that matches the fin hole size of different heat exchangers can be selected for hole enlargement, thus improving versatility.

[0024] In some embodiments of this application, the second needle segment and the first needle segment are connected by a threaded connection, a magnetic connection, or a snap-fit ​​connection.

[0025] In some embodiments of this application, a tube-piercing device is proposed, including the aforementioned guide pin, and further including: a second driving unit connected to the guide pin for driving the guide pin to move linearly.

[0026] Other features and advantages of this utility model will become clearer after reading the specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the guide pin according to an embodiment; Figure 2 This is a three-dimensional structural diagram of the guide pin penetrating into the heat exchanger according to an embodiment; Figure 3 for Figure 2 A magnified view of a portion at point D; Figure 4 This is a schematic diagram of the structure according to an embodiment, showing the guide pin extending from the heat exchanger. Figure 5 This is a schematic diagram of the structure according to an embodiment, showing a single guide pin moving to the opening of a copper tube. Figure 6 for Figure 5 A magnified view of a portion at point E; Figure 7 A three-dimensional structural diagram of the first needle body segment of a plurality of guide needles according to an embodiment being inserted into the interior of a copper tube; Figure 8 for Figure 7 A magnified view of a portion at point E; Figure 9 A front view of the first needle body segment of a plurality of guide needles according to an embodiment penetrating into the interior of a copper tube; Figure 10 This is a schematic diagram of the structure in which the first needle body segment of a single guide needle, according to an embodiment, is inserted into the interior of a copper tube.

[0029] Figure label: 100. Needle body; 110. Needle head; 120. First needle body section; 130. Transition section; 140. Second needle body section; 150. Third needle body section; 200. Heat exchanger; 300. Copper tube. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] In some embodiments of this application, a guide pin is proposed for guiding the copper tube 300 into the fin holes of the heat exchanger 200.

[0037] Reference Figure 1 As shown, the guide pin includes: The needle body 100 includes at least a first needle body segment 120 and a transition segment 130 arranged sequentially from the first end to the last end of the needle body 100.

[0038] The first needle body segment 120 has a maximum outer diameter smaller than the inner diameter of the copper tube 300 and the inner diameter of the fin hole.

[0039] The outer diameter of the first needle body section 120 is smaller than the inner diameter of the fin hole, which ensures that the first needle body section 120 can pass through the fin hole of the heat exchanger 200 when the needle body 100 moves along the fin hole of the heat exchanger 200.

[0040] The maximum outer diameter of the first needle body segment 120 is smaller than the inner diameter of the copper tube 300, ensuring that when the needle body 100 and the copper tube 300 are inserted, the first needle body segment 120 can be inserted into the copper tube 300 to straighten the copper tube 300.

[0041] The transition section 130 is connected to the first needle body section 120, and its maximum outer diameter is smaller than the inner diameter of the fin hole.

[0042] Setting the transition section 130 to have a maximum outer diameter smaller than the inner diameter of the fin hole ensures that the transition section 130 can pass through the heat exchanger 200 when the needle body 100 passes through the fin hole of the heat exchanger 200.

[0043] After the needle body 100 drives the first needle body segment 120 and the transition segment 130 through the heat exchanger 200, the first needle body segment 120 will continue to be inserted through the interior. When the transition segment 130 passes through the copper tube 300, it will be locked and fixed with the opening of the copper tube 300, thus realizing the connection between the first needle body segment 120 and the copper tube 300.

[0044] Reference Figure 3-10As shown, when the needle body 100 moves along the first direction, it drives the first needle body segment 120 to pass through the fin hole in sequence, insert into the copper tube 300, and be locked at the opening of the copper tube 300 by the transition section 130 so that the first needle body segment 120 and the copper tube 300 are connected. As the needle body 100 moves along the second direction, it cooperates with the first drive unit that drives the copper tube 300 to move, causing the first needle body segment 120 and the copper tube 300 located in the copper tube 300 to move along the second direction and be inserted into the fin hole.

[0045] In this embodiment, when the guide needle is inserted into the tube, the copper tube 300 is placed in place, and the opening of the U-shaped tube faces the heat exchanger 200, with a certain distance B between them.

[0046] Then, the guide pin is inserted into the fin hole of the heat exchanger 200 along the first direction. During the insertion process, the first needle body section 120 located at the front end of the guide pin first passes through the fin hole in the heat exchanger 200, and the transition section 130 then passes through the fin hole in the heat exchanger 200. After the first needle body section 120 and the transition section 130 pass out of the heat exchanger 200, they will continue to move to the tube opening of the copper tube 300. The first needle body section 120 is inserted into the copper tube 300, and the transition section 130 also continues to move into the copper tube 300. After the transition section 130 moves a certain distance, it is locked at the tube opening of the copper tube 300 and cannot move further. At this time, the first needle body section 120 is completely placed inside the copper tube 300, and the connection between the first needle body section 120 and the copper tube 300 is achieved through the locking cooperation of the transition section 130 and the tube opening of the copper tube 300.

[0047] After the first needle body segment 120 and the copper tube 300 are connected in place, the guide needle begins to move in a second direction, which is opposite to the first direction.

[0048] At this point, the insertion of the copper tube 300 and the heat exchanger 200 begins. The copper tube 300 is driven to move linearly in the second direction by the first drive unit, and the guide pin also moves linearly in the second direction simultaneously. Meanwhile, the copper tube 300 and the first needle body segment 120 built inside it move continuously toward the heat exchanger 200 by the first drive unit and the guide pin synchronous drive unit, and finally the copper tube 300 with the first needle body segment 120 built inside is inserted into the fin hole in the heat exchanger 200, thus realizing the insertion of the copper tube 300.

[0049] The above embodiments have the following advantages and effects: In this embodiment, the guide needle has a first needle body section 120 with a maximum outer diameter smaller than the outer diameter of the copper tube 300 and the fin hole of the heat exchanger 200. Simultaneously, a transition section 130 with a maximum outer diameter smaller than the inner diameter of the fin hole is provided. Before inserting the copper tube 300, the first needle body section 100 can be passed through the heat exchanger 200 and then inserted into the copper tube 300. The transition section 130, connected to the rear of the first needle body section 120, is engaged with the opening of the copper tube 300. During insertion, the first needle body section 120 and the copper tube 300 can be inserted together into the fin hole of the heat exchanger 200. The first needle body section 120, built into the copper tube 300, guides and enhances the relative rigidity of the copper tube 300 and improves its straightness, ensuring the rigidity and straightness of the copper tube 300, increasing the success rate of insertion, and preventing the heat exchanger 200 from bending and being damaged due to insufficient rigidity and straightness of the copper tube 300 during insertion.

[0050] In some embodiments of this application, reference is made to Figure 1 As shown, the needle body 100 includes: The second needle body section 140 is connected to the transition section 130, and the outer diameter of the second needle body section 140 is larger than the inner diameter of the fin hole. As the needle body 100 moves along the first direction, causing the first needle body segment 120 to be inserted into the copper tube 300, the second needle body segment 140 is located in the fin hole of the heat exchanger 200 to enlarge the inner diameter of the fin hole.

[0051] Reference Figure 6-7 As shown, after the first needle body section 120 and the transition section 130 pass through the heat exchanger 200, they enter the copper tube 300. At this time, the second needle body section 140, which is connected to the rear side of the first needle body section 120, is driven to pass through the heat exchanger 200. Since the outer diameter of the second needle body section 140 is larger than the inner diameter of the fin hole of the heat exchanger 200, when it passes through the heat exchanger 200, it will expand the fin hole, making the fin hole flat and the hole diameter larger, so that the copper tube 300 can pass through.

[0052] When the needle body 100 moves the first needle body segment 120 and the copper tube 300 along the second direction toward the direction close to the fin hole, at least part of the second needle body segment 140 is inside the fin hole.

[0053] During the insertion of the copper tube 300, the copper tube 300 and the first needle section 120 are continuously inserted into the fin holes, while the second needle section 140 is gradually withdrawn from the fin holes of the heat exchanger 200. However, the portion of the heat exchanger 200 where the copper tube 300 and the first needle section 120 are not inserted always contains the second needle section 140 inserted into the fin holes. The second needle section 140 remaining in the heat exchanger 200 supports the entire heat exchanger 200, thereby improving the relative rigidity of the entire heat exchanger 200.

[0054] The above embodiments have the following advantages and effects: By setting a second needle body section 140 with an outer diameter larger than the fin hole, when the first needle body section 120 is inserted into the copper tube 300, it can be inserted into the fin hole of the heat exchanger 200 to enlarge the fin hole. When the copper tube 300 and the first needle body section 120 move in opposite directions to pass through the tube, it is built into the heat exchanger 200 to improve the relative rigidity of the entire heat exchanger 200.

[0055] In some embodiments of this application, the needle body 100 includes: The second needle body section 140 is connected to the transition section 130, and the outer diameter of the second needle body section 140 is less than or equal to the inner diameter of the fin hole. When the needle body 100 moves the first needle body segment 120 and the copper tube 300 along the second direction toward the direction close to the fin hole, at least part of the second needle body segment 140 is inside the fin hole.

[0056] The second needle section 140 can also be configured to have the same inner diameter as the fin hole. When the first needle section 120 is inserted into the copper tube 300, the second needle section 140 is located inside the heat exchanger 200, and the second needle section 140 does not enlarge the fin hole.

[0057] When the copper tube 300 and the first needle body section 120 move along the second direction to insert the tube, the second needle body section 140 is at least partially located inside the heat exchanger 200 to improve the relative rigidity of the heat exchanger 200.

[0058] The above embodiments have the following advantages and effects: By using a second needle body section 140 with an outer diameter less than or equal to the fin hole, the relative rigidity of the entire heat exchanger 200 can be improved when the first needle body section 120 is inserted into the copper tube 300 and when the copper tube 300 and the first needle body section 120 move in opposite directions to pass through the tube.

[0059] In some embodiments of this application, reference is made to Figure 1 As shown, the needle body 100 includes a third needle body segment 150, which is connected to the second needle body segment 140. The outer diameter of the third needle body segment 150 is equal to or greater than the outer diameter of the second needle body segment 140.

[0060] In some embodiments of this application, reference is made to Figure 1 As shown, the needle body 100 includes: a needle head 110, the maximum outer diameter of which is smaller than the inner diameter of the fin hole and the inner diameter of the copper tube 300. The needle head is connected to the first needle body segment 120, and its outer diameter gradually increases along the direction close to the first needle body 100.

[0061] The needle head 110 is set to have a maximum outer diameter smaller than the inner diameter of the fin hole and the inner diameter of the copper tube 300, so as to ensure that when the guide needle moves, it can pass through the heat exchanger 200 and penetrate into the interior of the copper tube 300.

[0062] The needle head is designed with a smaller outer diameter closer to the tip of the guide needle and a gradually increasing outer diameter closer to the first needle body segment 120. This is mainly because the smaller outer diameter at the tip makes it easier for the guide needle to be inserted into the fin hole or copper tube 300, and the gradually changing outer diameter serves as a guide during insertion.

[0063] In some embodiments of this application, reference is made to Figure 1 As shown, the needle head 110 is a conical needle head 110 with an apex angle of A, where A = 8.5-9 degrees.

[0064] In some embodiments of this application, reference is made to Figure 1 As shown, the outer diameter of the transition section 130 gradually increases along the direction close to the second needle body section 140. The transition section 130 has a minimum outer diameter, a maximum outer diameter, and a locking outer diameter whose outer diameter value is between the minimum and maximum outer diameters. The minimum outer diameter is less than or equal to the inner diameter of the copper tube 300, and the locking outer diameter is greater than the inner diameter of the copper tube 300.

[0065] The transition section 130 is a conical section with an apex angle of C, where C = 6-6.3 degrees.

[0066] It is connected between the second needle body segment 140 and the first needle body segment 120, and smoothly transitions with the first needle body segment 120 and the second needle body segment 140 to ensure the smoothness of the guide needle.

[0067] The transition section 130 is configured such that its outer diameter increases as it gets closer to the second needle body section 140, and decreases as it gets closer to the first needle body section 120. The minimum outer diameter is less than or equal to the inner diameter of the copper tube 300, and the locking outer diameter, which is between the maximum and minimum outer diameters, is greater than the outer diameter of the copper tube 300. In this way, when the guide needle drives the first needle body section 120 to be inserted into the copper tube 300, the transition section 130 can also be partially inserted into the copper tube 300. Until the transition section 130 moves to the locking outer diameter, that is, when the outer diameter of the transition section 130 is greater than the inner diameter of the copper tube 300, it is locked and connected to the copper tube 300, ensuring that the transition section 130 can be inserted and connected to the copper tube 300.

[0068] If the outer diameter of the transition section 130 is set to be larger the closer it is to the outer diameter of the first needle body section 120, then after the first needle body section 120 is inserted into the copper tube 300, the transition section 130 can only abut against the opening of the copper tube 300 because its maximum outer diameter is larger than the inner diameter of the copper tube 300, and it cannot connect with the copper tube 300 and cannot perform subsequent tube insertion operations.

[0069] In some embodiments of this application, reference is made to Figure 8 As shown, the sum of the length of the first needle body segment 120 and the length of the needle head 110 is less than the length of the copper tube 300.

[0070] Because the copper tube 300 is a U-shaped tube, the first needle body segment 120 and the needle head 110 cannot be inserted at its bend.

[0071] When setting it up, the sum of the length of the first needle body segment 120 and the length of the needle head 110 is usually slightly less than the length of the copper tube 300.

[0072] By setting the sum of the length of the first needle body segment 120 and the length of the needle head 110 to be similar to the length of the copper tube 300, it can be ensured that the needle body 100 is supported almost throughout the entire copper tube 300, which greatly improves the rigidity and straightness of the entire copper tube 300. With the support of the first needle body segment 120 and the needle head 110 built into the copper tube 300, the copper tube 300 can complete a smooth and fast tube-threading operation when inserting parts.

[0073] In some embodiments of this application, reference is made to Figure 4 , 7 As shown, the length of the second needle segment 140 is greater than the length of the heat exchanger 200 and the sum of the distance between the heat exchanger 200 and the copper tube 300.

[0074] When the first needle body segment 120 and the needle head 110 are inserted into the copper tube 300, the second needle body segment 140 mainly moves within the fin holes of the heat exchanger 200 to enlarge the fin holes of the heat exchanger 200. Setting the length of the second needle body segment 140 to be greater than the sum of the length of the heat exchanger 200 and the distance between the heat exchanger 200 and the copper tube 300 (B) ensures that the second needle body segment 140 can completely pass through the heat exchanger 200 to enlarge all the fin holes in the heat exchanger 200, ensuring the consistency of the size of all the fin holes on the heat exchanger 200, and providing a guarantee for the subsequent insertion of the copper tube 300.

[0075] In some embodiments of this application, reference is made to Figure 1 As shown, the length of the second needle body segment 140 is greater than the length of the first needle body segment 120.

[0076] The first needle segment 120 is mainly used to insert into the copper tube 300 to improve the rigidity of the copper tube 300, and the second needle segment 140 is used to insert into the heat exchanger 200 to improve the rigidity of the heat exchanger 200. Therefore, the first needle segment 120 is set to be shorter than the second needle segment 140 to match the length of the copper tube 300, and the second needle segment 140 is set to be longer to match the length of the heat exchanger 200.

[0077] In some embodiments of this application, the second needle body segment is detachably connected to the first needle body segment, and multiple second needle body segments are provided, with different outer diameters for the multiple second needle body segments.

[0078] The above embodiments have the following advantages and effects: By configuring the second needle body segment into multiple different outer diameters and detachably connecting it to the first needle body segment, not only can the second needle body segment be easily disassembled and replaced, but it can also achieve modular design. In use, the second needle body segment that matches the fin hole size of different heat exchangers can be selected for hole enlargement, thus improving versatility.

[0079] In some embodiments of this application, the second needle segment and the first needle segment are connected by a threaded connection, a magnetic connection, or a snap-fit ​​connection.

[0080] In some embodiments of this application, a tube-piercing device is proposed, including a guide needle as described in the above embodiments, and further including a second driving unit connected to the guide needle for driving the guide needle to move linearly.

[0081] The tube-threading device includes a first drive unit and a second drive unit. The first drive unit can use a motor and linear module drive mechanism of existing technology, and the second drive unit can also use a motor and linear module drive mechanism of existing technology, which will not be elaborated here.

[0082] When the tube insertion device is inserting the tube, the second drive unit provides the power to guide the needle forward, so that the needle head 110 and the first needle body 120 of the guide needle pass through the heat exchanger 200 in sequence and are inserted into the copper tube 300. At the same time, the second needle body 140 is inserted into the fin hole in the heat exchanger 200 accordingly. When the first needle body section 120, the needle head 110, and the transition section 130 move to the stop outer diameter on the transition section 130 and are locked at the opening of the copper tube 300, the copper tube 300 is driven to move by the first drive unit, and the guide needle is driven to move synchronously by the second drive unit, so as to insert the copper tube 300 containing the first needle body section 120 and the needle head 110 into the fin hole of the heat exchanger 200 to realize the tube insertion action.

[0083] To achieve rapid tube insertion and improve insertion efficiency, multiple copper tubes 300 are arranged side by side with a first distance between them and the heat exchanger 200, corresponding to the positions of the multiple rows of fin holes on the heat exchanger 200. Multiple guide pins are set, and the second drive unit drives the multiple guide pins to pass through the multiple rows of fin holes and enter the multiple copper tubes 300 at one time. Correspondingly, the first drive unit also drives the multiple copper tubes 300 to move simultaneously to perform the tube insertion action.

[0084] The above embodiments have the following advantages and effects: In this embodiment, the tube insertion device works in conjunction with a first drive unit and a second drive unit. The second drive unit drives the first needle body segment 120 of the guide needle into the copper tube 300. Then, through the coordinated movement of the first drive unit and the second drive unit, the copper tube 300, which contains the first needle body segment 120 and the needle head 110, is quickly and smoothly inserted into the fin hole. The first needle body segment 120 and the needle head 110 of the guide needle enhance the overall rigidity and straightness of the copper tube 300, effectively solving the problem of insufficient rigidity and straightness of the copper tube 300 during the insertion process. This achieves smooth and efficient tube insertion, reduces damage to the heat exchanger 200 and the tube insertion device, and lowers production and maintenance costs.

[0085] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0086] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A guide pin for guiding and inserting copper tubes into the fin holes of a heat exchanger. Its features are, Including: The needle body, comprising at least the following components arranged sequentially along the direction from the head end to the tail end of the needle body: The first needle body segment has a maximum outer diameter smaller than the inner diameter of the copper tube and the inner diameter of the fin hole; The transition section, which is connected to the first needle body section, has a maximum outer diameter that is greater than the inner diameter of the copper tube and smaller than the inner diameter of the fin hole. When the needle moves along the first direction, it drives the first needle segment to pass through the fin hole in sequence, insert into the copper tube, and be locked at the copper tube opening by the transition section so that the first needle segment and the copper tube are connected. As the needle moves along the second direction, it cooperates with the first drive unit that drives the copper tube to move, causing the first needle segment located inside the copper tube and the copper tube to move along the second direction and be inserted into the fin hole.

2. The guide pin according to claim 1, characterized in that, The needle body includes: The second needle body segment is connected to the transition segment, and the outer diameter of the second needle body segment is larger than the inner diameter of the fin hole; During the insertion of the first needle body segment into the copper tube along the first direction, the second needle body segment is located in the fin hole of the heat exchanger to enlarge the inner diameter of the fin hole. When the needle body drives the first needle body segment and the copper tube to move along the second direction toward the direction of the fin hole, at least a portion of the second needle body segment is inside the fin hole.

3. The guide pin according to claim 1, characterized in that, The needle body includes: The second needle body segment is connected to the transition segment, and the outer diameter of the second needle body segment is less than or equal to the inner diameter of the fin hole; When the needle body drives the first needle body segment and the copper tube to move along the second direction toward the direction of the fin hole, at least a portion of the second needle body segment is inside the fin hole.

4. The guide pin according to claim 2, characterized in that, The needle body includes a third needle body segment, which is connected to the second needle body segment. The outer diameter of the third needle body segment is equal to or greater than the outer diameter of the second needle body segment.

5. The guide pin according to claim 2, characterized in that, The needle body includes a needle head, the maximum outer diameter of which is smaller than the inner diameter of the fin hole and the inner diameter of the copper tube. The needle head is connected to the first needle body section, and its outer diameter gradually increases along the direction close to the first needle body section.

6. The guide pin according to claim 5, characterized in that, The outer diameter of the transition section gradually increases along the direction close to the second needle body section. The transition section has a minimum outer diameter and a locking outer diameter whose outer diameter value is between the minimum outer diameter and the maximum outer diameter. The minimum outer diameter is less than or equal to the inner diameter of the copper tube, and the locking outer diameter is greater than the inner diameter of the copper tube.

7. The guide pin according to claim 5, characterized in that, The sum of the length of the first needle body segment and the length of the needle head is less than the length of the copper tube; The length of the second needle segment is greater than the sum of the length of the heat exchanger and the distance between the heat exchanger and the copper tube; the length of the second needle segment is greater than the length of the first needle segment.

8. The guide pin according to claim 2, characterized in that, The second needle body segment is detachably connected to the first needle body segment, and multiple second needle body segments are provided, with different outer diameters for the multiple second needle body segments.

9. The guide pin according to claim 8, characterized in that, The second needle segment is connected to the first needle segment by a threaded connection, a magnetic connection, or a snap-fit ​​connection.

10. A tube-threading device, characterized in that, The device includes a guide pin as described in any one of claims 1-9, and further includes a second driving unit connected to the guide pin for driving the guide pin to move linearly.

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