Manufacturing method of heat exchanger and heat exchanger

Abstract

The invention relates to a manufacturing method of a heat exchanger and the heat exchanger. The manufacturing method comprises the following steps that a heat exchanger core is provided, the heat exchanger core comprises a first header, the heat exchanger core is assembled, and the assembled heat exchanger core is subjected to furnace welding in a brazing furnace; taking out the heat exchanger core and cooling to a preset temperature; providing a distribution pipe, and inserting the distribution pipe into the first header along the length direction of the first header; and fixing the distribution pipe. The method further comprises the following steps: providing a first end cover, and arranging a first convex part on the first end cover; a second end cover is provided, the second end cover is provided with a second convex part and a first hole, and the first hole extends in the axial direction of the second convex part and penetrates through the second convex part; when the heat exchanger core body is assembled, the first end cover is mounted at one end of the first header in the length direction, and the second end cover is mounted at the other end of the first header in the length direction; according to the manufacturing method of the heat exchanger, the deformation and bending phenomena of the distribution pipe can be reduced, and the distribution of the refrigerant by the distribution pipe is more uniform.

Description

Technical Field

[0001] This application relates to the technical field of heat exchange, and particularly relates to a manufacturing method of a heat exchanger and a heat exchanger. Background Art

[0002] In the production and manufacturing process of a heat exchanger, after the heat exchanger is assembled, it needs to be brazed in a high-temperature brazing furnace. In this process, since the part of the distribution pipe arranged in the header pipe is suspended, when brazing, the header pipe reaches the brazing temperature but the distribution pipe fails to reach. After brazing, the header pipe cools first, but the distribution pipe inside it is still in an expanded state. The temperature difference between the distribution pipe and the header pipe and the heat softening of the distribution pipe during the brazing process will cause the suspended part of the distribution pipe in the header pipe to sag and deform and bend under the action of the cooling extrusion force, gravity, and material stress, resulting in poor uniformity of refrigerant distribution by the distribution pipe, and uneven refrigerant distribution will have a negative impact on the heat exchange performance of the heat exchanger. Summary of the Invention

[0003] The first aspect of the embodiments of this application provides a manufacturing method of a heat exchanger, which can reduce the deformation and bending phenomenon of the distribution pipe and make the distribution of the refrigerant by the distribution pipe more uniform.

[0004] According to the manufacturing method of the heat exchanger provided by the first aspect of the embodiments of this application, the manufacturing method includes the following steps: Provide a heat exchanger core body, the heat exchanger core body includes a first header pipe, assemble the heat exchanger core body, and perform furnace-through welding on the assembled heat exchanger core body in a brazing furnace; Take out the heat exchanger core body and cool it to a preset temperature; Provide a distribution pipe and insert the distribution pipe into the first header pipe along the length direction of the first header pipe; Fix the distribution pipe.

[0005] The beneficial effects of the embodiments of this application are: The manufacturing method of the heat exchanger provided by the embodiments of this application first performs furnace-through welding on the heat exchanger core body and cools it to a preset temperature, then inserts the distribution pipe into the first header pipe of the heat exchanger, and then fixes the distribution pipe. This process reduces the heating temperature of the distribution pipe, reduces the sagging and deformation and bending phenomenon of the distribution pipe under the action of the cooling extrusion force, gravity, and material stress, thereby improving the straightness of the distribution pipe and making the distribution of the refrigerant by the distribution pipe more uniform.

[0006] In addition, the manufacturing method of the heat exchanger provided by the first aspect of the embodiments of this application may also have the following additional technical features: In an alternative solution, the manufacturing method of the heat exchanger further includes the following steps: Provide a first end cap, and provide a first convex portion on the first end cap; Provide a second end cap, and provide a second convex portion and a first hole on the second end cap, wherein the first hole extends axially along the second convex portion and penetrates the second convex portion; When assembling the heat exchanger core, install the first end cap at one end of the first header along the length direction, and install the second end cap at the other end of the first header along the length direction.

[0007] In this solution, the first end cap and the second end cap are installed on the first header when assembling the heat exchanger core. During the subsequent furnace soldering process, the first end cap and the second end cap are soldered to the first header to form an integral body, so as to facilitate the insertion and fixation of the distribution pipe. The first convex portion of the first end cap and the second convex portion of the second end cap can increase the contact area with the distribution pipe, thereby increasing the stability after the distribution pipe is fixed.

[0008] In an alternative solution, when inserting the distribution pipe into the first header, the distribution pipe passes through the first hole and is inserted to a preset depth in the first header. At the preset depth, one end of the distribution pipe along the length direction is located inside the first convex portion; fixing the distribution pipe includes fixedly connecting the distribution pipe to the first convex portion and fixedly connecting the distribution pipe to the second convex portion.

[0009] In this solution, the distribution pipe is inserted into the first header through the first hole of the second end cap. The second convex portion of the second end cap can play a guiding role for the distribution pipe during the insertion process of the distribution pipe, facilitating the insertion of the distribution pipe. In addition, in order to ensure the fixing effect between the distribution pipe and the first convex portion, one end of the distribution pipe along the length direction needs to be inserted into the first convex portion.

[0010] In an alternative solution, the first convex portion protrudes outward from one end face of the first header along the length direction, and / or the second convex portion protrudes outward from the other end face of the first header along the length direction. Generally speaking, the main way to fix the distribution pipe to the first convex portion and the second convex portion is welding. Therefore, when the first convex portion protrudes outward from the first header and / or the second convex portion protrudes outward from the first header, the welding temperature can directly reach the first convex portion and / or the second convex portion, thereby improving the welding efficiency.

[0011] In an alternative solution, the manufacturing method of the heat exchanger further includes the following steps: Provide a positioning portion, which is used to assist in observing whether the distribution pipe is inserted to the preset depth; define the depth of the first convex portion as D1, and the length of the distribution pipe inserted into the first convex portion at the preset depth as H1, then D1 and H1 satisfy: 2 / 3 ≤ H1 / D1 < 1.

[0012] In this solution, the positioning part can be used to confirm whether the distribution pipe is inserted to the preset depth. Additionally, when the length of the distribution pipe within the first convex part is insufficient, the contact area between the two after welding is small, and the connection is not stable enough. When the distribution pipe is inserted too deep and the end face of the distribution pipe contacts the inner end wall of the first convex part (i.e., H1 = D1), there is no surplus between the two. If welding is performed, it will cause the distribution pipe to expand due to heat and be squeezed, resulting in local deformation of the distribution pipe, which may affect the distribution performance of the distribution pipe. Therefore, when the depth D1 of the first convex part and the length H1 of the distribution pipe within the first convex part satisfy 2 / 3 ≤ H1 / D1 < 1, it can not only ensure the contact area between the two but also prevent the deformation of the distribution pipe caused by high-temperature welding.

[0013] In an alternative solution, the positioning part includes a first piece, and the distribution pipe includes a straight pipe section and a bent pipe section, and the bent pipe section forms a preset angle with the straight pipe section; When inserting the distribution pipe, arrange the first piece between the second end cover and the bent pipe section, insert the distribution pipe, and after the bent pipe section contacts the first piece, remove the first piece.

[0014] In this solution, the first piece is used to ensure the insertion depth of the distribution pipe. Preset the size of the first piece so that its size in the length direction of the distribution pipe is approximately equal to the size between the second end cover and the bent pipe section after the distribution pipe is inserted to the preset position. Therefore, when the distribution pipe has not been inserted to the preset depth, there will be a certain gap between the bent pipe section of the distribution pipe and the first piece, so that the distribution pipe can continue to be inserted. Conversely, it means that the distribution pipe has been inserted to the preset depth, and the first piece can be removed to proceed to the next step.

[0015] In an alternative solution, the positioning part includes a positioning mark, and the positioning mark is set on the outer pipe wall of the distribution pipe. When the distribution pipe is inserted to the preset depth of the first header, at least part of the positioning mark is located within the second convex part.

[0016] In this solution, the insertion depth of the distribution pipe is observed through the positioning mark to prevent the situation where the distribution pipe is not inserted into the first convex part or is not inserted in place. The positioning mark can be set on the outer wall of the distribution pipe. When inserting the distribution pipe, judge the insertion depth of the distribution pipe by observing whether the positioning mark is blocked by the second convex part.

[0017] In an alternative solution, the positioning mark includes a marking point or a marking ring. The marking point includes a convex point or a concave point, and the marking ring includes a convex ring or an annular groove. Through marking methods such as marking points, marking rings, convex rings, and annular grooves, the insertion depth of the first pipe can be visually identified, and such marking methods have a relatively low cost.

[0018] In an alternative solution, if the direction of gravity is defined as the first direction, when inserting the distribution pipe, the length direction of the first header extends along the first direction, and the length direction of the distribution pipe is inserted into the first header along the first direction.

[0019] In this solution, the length direction of the first header is along the direction of gravity, and then the distribution pipe is inserted into the first header. This can enable gravity to play a certain guiding role for the distribution pipe, reducing the tilting phenomenon during the insertion of the distribution pipe. At the same time, when the direction of gravity is the same as the insertion direction, the distribution pipe can be inserted more quickly, thereby improving the assembly efficiency.

[0020] In an alternative solution, the manufacturing method of the heat exchanger includes the following steps: Preset an internal thread on the inner wall of the first convex portion, preset an external thread on the pipe wall of the distribution pipe. After the distribution pipe is inserted into the first header, screw-connect the distribution pipe and the first convex portion; Weld the second convex portion and the distribution pipe by flame welding or induction welding.

[0021] In this solution, the distribution pipe and the first convex portion are fixedly connected by the matching internal and external threads, thus omitting the subsequent welding steps at this position. Only the second convex portion of the second end cover needs to be welded, thereby improving the efficiency of fixing the distribution pipe.

[0022] In an alternative solution, the manufacturing method of the heat exchanger includes the following steps: Preset a second hole on the side wall of the first convex portion. The second hole penetrates the side wall of the first convex portion. After the distribution pipe is inserted to a preset depth, fill solder into the second hole and weld the first convex portion and the distribution pipe; Weld the second convex portion and the distribution pipe by flame welding or induction welding.

[0023] The second hole in this solution can be used as an observation hole to facilitate observing whether the distribution pipe is inserted to the preset position when inserted into the first convex portion; at the same time, the second hole can also be used as a solder addition hole to add solder through the second hole to weld the distribution pipe and the first convex portion.

[0024] In an alternative solution, when welding and fixing the distribution pipe, first weld the first convex portion and the distribution pipe, and then weld the second convex portion and the distribution pipe. Because the end of the distribution pipe is located inside the first convex portion, when welding the distribution pipe, the high temperature will cause the distribution pipe to expand due to heat. Therefore, when welding the first convex portion and the distribution pipe first, the distribution pipe will deform towards the side of the second convex portion. The first hole of the second convex portion leaves a large space for the deformation extension of the distribution pipe, thereby reducing the local extrusion caused by the heat deformation of the distribution pipe.

[0025] In the second aspect of the embodiments of the present application, a heat exchanger is provided. The heat exchanger includes a first header and a distribution pipe. The distribution pipe is arranged on the first header along the length direction of the first header, and the distribution pipe is arranged on the first header by the manufacturing method in the first aspect of the embodiments.

[0026] The beneficial effects of the embodiments of the present application are as follows: The heat exchanger provided in the second aspect of the embodiments of the present application is manufactured by the manufacturing method provided in the first aspect of the embodiments. Since the manufacturing method in the first aspect of the embodiments improves the straightness of the distribution pipe, making the distribution of the refrigerant by the distribution pipe more uniform, the heat exchanger in this embodiment has better heat exchange performance.

[0027] In an alternative solution, the heat exchanger further includes a second header, heat exchange tubes and fins. The second header is arranged at an interval from the first header. The heat exchange tubes connect the first header and the second header, and the fins are located between at least some adjacent two of the heat exchange tubes.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. Specification Drawings

[0029] Figure 1 It is a schematic flow chart of the manufacturing method of the heat exchanger provided by the present application in a specific embodiment; Figure 2 It is a schematic flow chart of the manufacturing method of the heat exchanger provided by the present application in another specific embodiment; Figure 3 It is a schematic structural diagram of the heat exchanger core provided by the present application in a specific embodiment; Figure 4 It is a partially enlarged structural diagram when the first end cap and the first header of the heat exchanger provided by the present application are installed; Figure 5 It is a partially enlarged structural diagram when the second end cap and the first header of the heat exchanger provided by the present application are installed; Figure 6 It is a structural diagram when the distribution pipe and the first header of the heat exchanger provided by the present application are installed; Figure 7 It is a schematic structural diagram of the first end cap provided by the present application in a specific embodiment; Figure 8 It is a schematic structural diagram of the positioning portion provided by the present application in a specific embodiment; Figure 9 It is a schematic structural diagram of the positioning portion provided by the present application in another specific embodiment; Figure 10 It is a schematic structural diagram of the heat exchanger provided by the present application in a specific embodiment.

[0030] Reference numerals: first header 1, distribution pipe 2, straight pipe section 21, bent pipe section 22, first end cap 3, first convex portion 31, second hole 311, second end cap 4, second convex portion 41, first hole 42, positioning portion 5, first part 51, positioning mark 52, second header 6, heat exchange pipe 7, fin 8.

[0031] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. Embodiment

[0032] For a better understanding of the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0033] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0034] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0035] It should be understood that the term " / and" used herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0036] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the angles shown in the accompanying drawings, and should not be construed as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0037] In the first aspect of the embodiments of the present application, a manufacturing method of a heat exchanger is provided. Taking the application of this manufacturing method in the manufacturing process of the heat exchanger as an example, the technical solutions and effects are described. The heat exchanger mentioned in the embodiments of the present application can be a parallel flow heat exchanger or a microchannel tube heat exchanger. However, the specific types of heat exchangers are not limited to the descriptions herein and can also be other various heat exchangers that require a distribution pipe for refrigerant distribution, which will not be elaborated herein.

[0038] As Figures 1 - 10 shown, in the first aspect of the embodiments of the present application, a manufacturing method of a heat exchanger is provided. This manufacturing method of the heat exchanger can greatly reduce the deformation and bending of the distribution pipe, making the distribution of the refrigerant by the distribution pipe more uniform. The manufacturing method specifically includes the following steps: Provide a heat exchanger core body. The heat exchanger core body includes a first header 1. Assemble the heat exchanger core body and perform furnace brazing on the assembled heat exchanger core body in a brazing furnace; Take out the heat exchanger core body and cool it to a preset temperature; Provide a distribution pipe 2 and insert the distribution pipe 2 into the first header 1 along the length direction of the first header 1; Fix the distribution pipe 2.

[0039] Specifically, in addition to the first header 1, the heat exchanger core body in this embodiment also includes a second header, heat exchange tubes (when the heat exchanger is a microchannel heat exchanger, the heat exchange tubes can be flat tubes with multiple channels), etc. During the assembly process of the heat exchanger core body, insert the heat exchange tubes into the installation grooves of the first header 1 and the second header. In this process, the heat exchange tubes can be inserted into the installation grooves of the heat exchange tubes one by one, or after the heat exchange tubes are arranged, the installation grooves and the heat exchange tubes are in one-to-one correspondence, and then an operation is performed on the manifold to install the heat exchange tubes into the installation grooves.

[0040] For a heat exchanger core body containing fins, one form of its assembly process is that the heat exchange tubes and the manifolds (i.e., the first header 1 and the second header) are first assembled into one body, and then the fins are inserted between the heat exchange tubes according to the fin distribution form; one form is to alternately place one heat exchange tube and one fin until the size of the heat exchanger is reached, and then the installation grooves on the manifold are in one-to-one correspondence with the heat exchange tubes, and an operation is performed on the manifold to install the heat exchange tubes into the installation grooves; another form is the cross-assembly of the heat exchange tubes, the manifolds, and the fins. One heat exchange tube is inserted into the installation groove, and then one fin is placed immediately, and the assembly is carried out in sequence. In addition, for the assembly of other components included in the heat exchanger core body, such as mounting brackets, adapter seats, pipe sleeves, etc., which are components that need to be brazed and welded, they can be assembled before the core body assembly or after the core body assembly, which is not specifically limited herein.

[0041] After the heat exchanger core is assembled, the heat exchanger core can be passed through a furnace, and brazing in a brazing furnace is used to achieve welding between components within the heat exchanger core. In the main brazing area of the brazing furnace, the temperature is generally between 550°C and 620°C, and then it passes through a cooling section to lower the temperature of the core.

[0042] After the temperature drops to the preset temperature, the distribution pipe 2 can be inserted into the first header 1, and then the distribution pipe 2 is fixed, thus completing the main manufacturing process of the heat exchanger. It should be noted that the preset temperature pointed out in the embodiments of the present application refers to the temperature at which the distribution pipe 2 is not easily deformed after being heated. Since its range is relatively large, it can be room temperature, or higher than room temperature and lower than the temperature after cooling in the cooling section. Therefore, no specific limitation is made herein.

[0043] In the manufacturing method of the heat exchanger provided by the embodiments of the present application, after the heat exchanger core is passed through the furnace for welding and cooled to the preset temperature, the distribution pipe 2 is inserted into the first header 1 of the heat exchanger, and then the distribution pipe 2 is fixed. This process greatly reduces the heating temperature of the distribution pipe 2. Since the distribution pipe 2 is not assembled into the heat exchanger core for overall furnace brazing, the part of the distribution pipe 2 that is suspended inside the first header 1 is not affected by the high temperature during furnace brazing, avoiding the drooping and deformation bending phenomena of the distribution pipe 2 under the action of cooling extrusion force, gravity, and material stress during furnace brazing, thereby improving the straightness of the distribution pipe 2 and making the distribution of the refrigerant by the distribution pipe 2 more uniform.

[0044] It should be noted that since the distribution pipe 2 is not welded in the brazing furnace, after it is fixed to the heat exchanger core, its overall straightness hardly changes compared with that before being assembled into the heat exchanger core. The distribution pipe 2 with a high straightness can improve the distribution performance and at the same time reduce the abnormal noise generated by the distribution pipe 2 when the refrigerant flows through it. The effects it can produce are far better than the manufacturing method of furnace brazing the distribution pipe together with the heat exchanger core.

[0045] As Figure 2 shown, in a specific embodiment, the manufacturing method of the heat exchanger further includes the following steps: Provide a first end cap 3 and set a first convex portion 31 on the first end cap 3; Provide a second end cap 4 and set a second convex portion 41 and a first hole 42 on the second end cap 4. The first hole 42 extends along the axial direction of the second convex portion 41 and penetrates the second convex portion 41; When assembling the heat exchanger core, install the first end cap 3 at one end of the first header 1 along the length direction, and install the second end cap 4 at the other end of the first header 1 along the length direction.

[0046] In this embodiment, the first end cover 3 and the second end cover 4 are installed on the first header 1 when assembling the heat exchanger core. During the subsequent furnace welding process, they enter the brazing furnace together with the heat exchanger core. The first end cover 3 and the second end cover 4 are welded to the first header 1 to form an integral body, so as to facilitate the insertion and fixation of the subsequent distribution pipe 2. It should be noted that the first convex portion 31 and the second convex portion 41 are added parts on the basis of the original end cover, and they can be integrally formed with the end cover by stamping or other means. Generally speaking, the extending directions of the first convex portion 31 and the second convex portion 41 are along the length direction of the first header 1.

[0047] After the distribution pipe 2 is fixed in cooperation with the first convex portion 31 and the second convex portion 41, the first convex portion 31 of the first end cover 3 and the second convex portion 41 of the second end cover 4 can increase the contact area with the distribution pipe 2, thereby increasing the stability of the distribution pipe 2 after fixation. In a specific embodiment, when inserting the distribution pipe 2 into the first header 1, the distribution pipe 2 passes through the first hole 42 and is inserted to a preset depth in the first header 1. At the preset depth, one end of the distribution pipe 2 along the length direction is located within the first convex portion 31. Fixing the distribution pipe 2 includes fixedly connecting the distribution pipe 2 to the first convex portion 31 and fixedly connecting the distribution pipe 2 to the second convex portion 41. The fixing methods of the first convex portion 31 and the second convex portion 41 with the distribution pipe 2 will be specifically described in subsequent embodiments.

[0048] In this embodiment, the distribution pipe 2 is inserted into the first header 1 through the first hole 42 of the second end cover 4. The second convex portion 41 of the second end cover 4 can play a guiding role for the distribution pipe 2 during the insertion process of the distribution pipe 2, facilitating the insertion of the distribution pipe 2. In addition, in order to ensure the fixing effect between the distribution pipe 2 and the first convex portion 31, one end of the distribution pipe 2 along the length direction needs to be inserted into the first convex portion 31. In this way, after fixing the first convex portion 31 and the distribution pipe 2, and the second convex portion 41 and the distribution pipe 2, the distribution pipe 2 can form an integral body with the heat exchanger core, and the connection between the distribution pipe 2 and the two convex portions is more stable.

[0049] As Figures 3 - 5 shown, in a specific embodiment, the first convex portion 31 protrudes outward from one end face of the first header 1 along the length direction, and / or the second convex portion 41 protrudes outward from the other end face of the first header 1 along the length direction. Generally speaking, the main way to fix the distribution pipe 2 to the first convex portion 31 and the second convex portion 41 is welding. Therefore, when the first convex portion 31 protrudes outward from the first header 1, and / or the second convex portion 41 protrudes outward from the first header 1, the welding temperature can directly reach the first convex portion 31 and / or the second convex portion 41, thereby improving the welding efficiency.

[0050] Taking the first convex part 31 as an example, when the first convex part 31 is recessed inward from one end face of the first header 1 along the length direction, the extending direction of the first convex part 31 is into the first header 1. Such a first convex part 31 can still increase the contact area with the distribution pipe 2, achieving a more stable connection effect. However, when welding the first convex part 31 is required, the welding temperature needs to pass through the first header 1 to reach the position of the first convex part 31. During this process, part of the temperature will be lost, resulting in slower heating of the first convex part 31 and affecting the welding effect. Therefore, when the first convex part 31 and the second convex part 41 protrude outward from the first header 1, the temperature can directly reach the position to be welded, thereby improving the welding efficiency.

[0051] As Figure 6 shown, in a specific embodiment, the manufacturing method of the heat exchanger further includes the following steps: Provide a positioning part 5, and the positioning part 5 is used to assist in observing whether the distribution pipe 2 is inserted to a preset depth; define the depth of the first convex part 31 as D1, and the length of the distribution pipe 2 inserted into the first convex part 31 at the preset depth as H1, then D1 and H1 satisfy: 2 / 3 ≤ H1 / D1 < 1.

[0052] As mentioned above, the length of the distribution pipe 2 inserted into the first convex part 31 will affect the connection stability between the two. Therefore, how to confirm whether it is inserted in place is very important for the connection stability between the two. In this embodiment, through the positioning part 5, it can be confirmed whether the distribution pipe 2 is inserted to the preset depth, thereby ensuring the connection between the two.

[0053] More specifically, there are also details to note when the two are connected: when the length of the distribution pipe 2 inside the first convex part 31 is insufficient, the contact area after welding between the two is small and the connection is not stable enough; but when the distribution pipe 2 is inserted too deep and the end face of the distribution pipe 2 contacts the inner end wall of the first convex part 31 (i.e., H1 = D1), there is no surplus between the two. If welding is carried out, it will cause the distribution pipe 2 to expand and be extruded by heat, resulting in local deformation of the distribution pipe 2. The deformed distribution pipe 2 may affect the distribution performance of the distribution pipe 2. Therefore, when the depth D1 of the first convex part 31 and the length H1 of the distribution pipe 2 inside the first convex part 31 satisfy 2 / 3 ≤ H1 / D1 < 1, it can not only ensure the contact area between the two, but also leave a deformation space during welding to prevent the distribution pipe 2 from expanding and deforming due to high-temperature welding. In order to achieve this insertion depth, methods such as presetting a limiting part or a necking can be used, and specific limitations are not made in this article.

[0054] As Figure 8 shown, in a specific embodiment, the positioning part 5 includes a first part 51, the distribution pipe 2 includes a straight pipe section 21 and a bent pipe section 22, and the bent pipe section 22 forms a preset angle with the straight pipe section 21; When inserting the distribution pipe 2, arrange the first piece 51 between the second end cover 4 and the bent pipe section 22, insert the distribution pipe 2, and remove the first piece 51 after the bent pipe section 22 contacts the first piece 51.

[0055] In this embodiment, the insertion depth of the distribution pipe 2 is ensured by the first piece 51. The size of the first piece 51 is preset so that its dimension in the length direction of the distribution pipe 2 is approximately equal to the dimension between the second end cover 4 and the bent pipe section 22 after the distribution pipe 2 is inserted into the preset position. Therefore, when the distribution pipe 2 has not been inserted to the preset depth, there will be a certain gap between the bent pipe section 22 of the distribution pipe 2 and the first piece 51, indicating that the distribution pipe 2 has not been inserted to the preset depth and the distribution pipe 2 can be continuously inserted. On the contrary, it means that the distribution pipe 2 has been inserted to the preset depth and the first piece 51 can be taken out for the next step.

[0056] As Figure 9 shown, in another specific embodiment, the positioning portion 5 includes a positioning mark 52. The positioning mark 52 is provided on the outer pipe wall of the distribution pipe 2. When the distribution pipe 2 is inserted to the preset depth of the first header 1, at least part of the positioning mark 52 is located within the second convex portion 41. The positioning mark 52 may include a marking point or a marking ring. The marking point includes a convex point or a concave point, and the marking ring includes a convex ring or an annular groove. The insertion depth of the first pipe can be visually distinguished through marking methods such as marking points, marking rings, convex rings, and annular grooves, and such marking methods have a relatively low cost.

[0057] In this embodiment, the insertion depth of the distribution pipe 2 is observed through the positioning mark 52 to prevent the situation where the distribution pipe 2 is not inserted into the first convex portion 31 or is not inserted in place. The positioning mark 52 can be provided on the outer wall of the distribution pipe 2. When inserting the distribution pipe 2, the insertion depth of the distribution pipe 2 is judged by observing whether the positioning mark 52 is blocked by the second convex portion 41. For example, when reaching the preset depth mentioned above, the length that the distribution pipe 2 needs to be inserted into the first header 1 is H2. Then a positioning mark 52 can be set at a position where the distance from one end of the distribution pipe 2 inserted into the first header 1 to the pipe wall is H2. During the process of inserting the distribution pipe 2, when the positioning mark 52 is blocked by the second convex portion 41, it means that the distribution pipe 2 has been inserted by a length of H2, that is, the preset depth has been reached, and the distribution pipe 2 is no longer inserted continuously.

[0058] In a specific embodiment, if the direction of gravity is defined as the first direction, when inserting the distribution pipe 2, the length direction of the first header 1 extends along the first direction, and the length direction of the distribution pipe 2 is inserted into the first header 1 along the first direction.

[0059] In this embodiment, the length direction of the first header 1 is along the gravity direction, and then the distribution pipe 2 is inserted into the first header 1. In this way, gravity can play a certain guiding role for the distribution pipe 2, reducing the inclination phenomenon during the insertion of the distribution pipe 2. At the same time, when the gravity direction is the same as the insertion direction, the distribution pipe 2 can be inserted more quickly, thereby improving the assembly efficiency.

[0060] If the distribution pipe 2 is inserted into the first header 1 when the first header 1 is horizontal, because the lumen of the first header 1 is small and the length is long, when the distribution pipe 2 is inserted into the first header 1, the deeper it is inserted, the more the suspended end of the insertion will gradually tilt downward under the influence of gravity, resulting in incomplete insertion and low efficiency. However, when the first header 1 is placed vertically, this problem can be effectively avoided, improving both the insertion accuracy and the assembly efficiency.

[0061] In a specific embodiment, the manufacturing method of the heat exchanger includes the following steps: Preset an internal thread on the inner wall of the first convex portion 31, preset an external thread on the pipe wall of the distribution pipe 2, and after the distribution pipe 2 is inserted into the first header 1, screw-connect the distribution pipe 2 and the first convex portion 31; Weld the second convex portion 41 and the distribution pipe 2 by flame welding or induction welding.

[0062] In this embodiment, the distribution pipe 2 and the first convex portion 31 are fixedly connected by matching internal and external threads, thus omitting the subsequent welding steps at this position. Only the second convex portion 41 of the second end cover 4 needs to be welded, thereby improving the efficiency of fixing the distribution pipe 2. Generally speaking, the external thread only needs to be set on a section of the pipe wall near the insertion end of the distribution pipe 2.

[0063] As Figure 7 shown, in a specific embodiment, the manufacturing method of the heat exchanger includes the following steps: Preset a second hole 311 on the side wall of the first convex portion 31, the second hole 311 penetrates the side wall of the first convex portion 31. After the distribution pipe 2 is inserted to the preset depth, fill solder into the second hole 311 and weld the first convex portion 31 and the distribution pipe 2; Weld the second convex portion 41 and the distribution pipe 2 by flame welding or induction welding.

[0064] The second hole 311 in this solution can be used as an observation hole to facilitate observing whether the distribution pipe 2 is inserted to the preset position when inserted into the first convex portion 31; at the same time, the second hole 311 can also be used as a solder adding hole, and solder is added through the second hole 311 to weld the distribution pipe 2 and the first convex portion 31. In addition, in order for the solder to better enter the first convex portion 31, the second hole 311 can be set in the shape of a tapered hole.

[0065] In a specific embodiment, when welding and fixing the distribution pipe 2, it is necessary to first weld the first convex portion 31 to the distribution pipe 2, and then weld the second convex portion 41 to the distribution pipe 2. Since the end of the distribution pipe 2 is located within the first convex portion 31, when welding the distribution pipe 2, the high temperature will cause the distribution pipe 2 to expand due to heat. Therefore, when welding the first convex portion 31 to the distribution pipe 2 first, the distribution pipe 2 will deform towards the side of the second convex portion 41. The first hole 42 of the second convex portion 41 provides space for the deformation extension of the distribution pipe 2, thereby reducing the local extrusion caused by the thermal deformation of the distribution pipe 2 and facilitating the guarantee of the straightness of the distribution pipe 2.

[0066] As Figure 10 shown, in the second aspect of the embodiments of the present application, a heat exchanger is provided. The heat exchanger includes a first header 1 and a distribution pipe 2. The distribution pipe 2 is arranged along the length direction of the first header 1 and is arranged on the first header 1 by the manufacturing method in the first aspect of the embodiments. The heat exchanger in this embodiment is made by the manufacturing method provided in the first aspect of the embodiments. Since the manufacturing method in the first aspect of the embodiments improves the straightness of the distribution pipe 2, making the distribution of the refrigerant by the distribution pipe 2 more uniform, the heat exchanger in this embodiment has better heat exchange performance.

[0067] As Figure 10 shown, in a specific embodiment, the heat exchanger further includes a second header 6, heat exchange tubes 7 and fins 8. The second header 6 is arranged at an interval from the first header 1. The heat exchange tubes 7 communicate the first header 1 and the second header 6. The fins 8 are located between at least some adjacent two heat exchange tubes 7.

[0068] It should be noted that the first header 1 and the second header 6 are arranged at an interval. The interval between the two headers is mainly used for installing the heat exchange tubes 7. Therefore, the distance between them is the remaining length after the heat exchange tubes 7 are connected to the two headers. In addition, the first header 1 and the second header 6 can be arranged relatively parallel or at a certain angle to each other. Specifically, it can be preset according to the installation environment and the use scenario of the heat exchanger, etc. This is not specifically described in this article. Generally speaking, the first header 1 and the second header 6 are relatively parallel. Therefore, this situation is also shown in the illustrations of this embodiment for easy understanding.

[0069] In addition, the fins 8 arranged between at least some adjacent two heat exchange tubes 7 can be transverse fins or corrugated fins, which can be preset according to the size of the heat exchanger and the use scenario, etc. This is not specifically limited in this article.

[0070] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A manufacturing method of a heat exchanger, characterized in that, It includes the following steps: Provide a heat exchanger core body, the heat exchanger core body includes a first header (1), assemble the heat exchanger core body, and perform furnace brazing on the assembled heat exchanger core body in a brazing furnace; Take out the heat exchanger core body and cool it to a preset temperature; Provide a distribution pipe (2), and insert the distribution pipe (2) into the first header (1) along the length direction of the first header (1); Fix the distribution pipe (2).

2. The manufacturing method of the heat exchanger according to claim 1, characterized in that, It also includes the following steps: Provide a first end cover (3), and set a first convex portion (31) on the first end cover (3); Provide a second end cover (4), and set a second convex portion (41) and a first hole (42) on the second end cover (4), the first hole (42) extends along the axial direction of the second convex portion (41) and penetrates the second convex portion (41); When assembling the heat exchanger core body, install the first end cover (3) at one end of the first header (1) along the length direction, and install the second end cover (4) at the other end of the first header (1) along the length direction.

3. The manufacturing method of the heat exchanger according to claim 2, characterized in that, When inserting the distribution pipe (2) into the first header (1), the distribution pipe (2) passes through the first hole (42) and is inserted into the first header (1) to a preset depth. At the preset depth, one end of the distribution pipe (2) along the length direction is located inside the first convex portion (31); Fixing the distribution pipe (2) includes fixedly connecting the distribution pipe (2) with the first convex portion (31) and fixedly connecting the distribution pipe (2) with the second convex portion (41).

4. The manufacturing method of the heat exchanger according to claim 3, characterized in that, The first convex portion (31) protrudes outward from one end face of the first header (1) along the length direction, and / or the second convex portion (41) protrudes outward from the other end face of the first header (1) along the length direction.

5. The manufacturing method of the heat exchanger according to claim 3, characterized in that, It also includes the following steps: Provide a positioning portion (5), the positioning portion (5) is used to assist in observing whether the distribution pipe (2) is inserted to the preset depth; define the depth of the first convex portion (31) as D1, and the length of the distribution pipe (2) inserted into the first convex portion (31) at the preset depth as H1, then D1 and H1 satisfy: 2 / 3 ≤ H1 / D1 < 1.

6. The manufacturing method of the heat exchanger according to claim 5, characterized in that, The positioning portion (5) includes a first part (51), the distribution pipe (2) includes a straight pipe section (21) and a bent pipe section (22), and the bent pipe section (22) forms a preset angle with the straight pipe section (21); When inserting the distribution pipe (2), arrange the first part (51) between the second end cover (4) and the bent pipe section (22), insert the distribution pipe (2), and take away the first part (51) after the bent pipe section (22) contacts the first part (51).

7. The manufacturing method of the heat exchanger according to claim 5, characterized in that, The positioning portion (5) includes a positioning mark (52), the positioning mark (52) is set on the outer pipe wall of the distribution pipe (2), and when the distribution pipe (2) is inserted to the preset depth of the first header (1), the positioning mark (52) is at least partially located inside the second convex portion (41).

8. The manufacturing method of the heat exchanger according to claim 7, characterized in that, The positioning mark (52) includes a marking point or a marking ring. The marking point includes a convex point or a concave point, and the marking ring includes a convex ring or an annular groove.

9. The manufacturing method of the heat exchanger according to any one of claims 2-8, characterized in that, Define the direction of gravity as the first direction. When inserting the distribution pipe (2), the length direction of the first header (1) extends along the first direction, and the length direction of the distribution pipe (2) is inserted into the first header (1) along the first direction.

10. The manufacturing method of the heat exchanger according to claim 9, characterized in that, Comprising the following steps: Preset an internal thread on the inner wall of the first convex portion (31), preset an external thread on the pipe wall of the distribution pipe (2). After the distribution pipe (2) is inserted into the first header (1), screw-connect the distribution pipe (2) and the first convex portion (31). Weld the second convex portion (41) and the distribution pipe (2) by flame welding or induction welding.

11. The manufacturing method of the heat exchanger according to claim 9, characterized in that, Comprising the following steps: Preset a second hole (311) on the side wall of the first convex portion (31). The second hole (311) penetrates the side wall of the first convex portion (31). After the distribution pipe (2) is inserted to a preset depth, fill solder into the second hole (311) and weld the first convex portion (31) and the distribution pipe (2). Weld the second convex portion (41) and the distribution pipe (2) by flame welding or induction welding.

12. The manufacturing method of the heat exchanger according to claim 11, characterized in that, When welding and fixing the distribution pipe (2), first weld the first convex portion (31) and the distribution pipe (2), and then weld the second convex portion (41) and the distribution pipe (2).

13. A heat exchanger, the heat exchanger comprising a first header (1) and a distribution pipe (2), the distribution pipe (2) being disposed along the length direction of the first header (1) on the first header (1), characterized in that, The distribution pipe (2) is arranged on the first header (1) by the manufacturing method according to any one of claims 1-12.

14. The heat exchanger according to claim 13, characterized in that, The heat exchanger further includes a second header (6), heat exchange tubes (7) and fins (8). The second header (6) is arranged at an interval from the first header (1). The heat exchange tubes (7) communicate the first header (1) and the second header (6). The fins (8) are located between at least some adjacent two of the heat exchange tubes (7).

Images