Branch pipe switching structure, refrigerant distributor, refrigerant collector and heat exchange equipment

Abstract

The utility model provides a branch pipe switching structure, a refrigerant distributor, a refrigerant collector and heat exchange equipment. And a plurality of branch pipes on the refrigerant distributor or the refrigerant collector are distributed in an annular array or a single row. The branch pipe adapter structure comprises an adapter plate and at least one branch pipe lining. The adapter plate is provided with a plurality of adapter holes distributed in rows and columns, the aperture of at least one part of the adapter holes is larger than the outer diameter of the branch pipes assembled with the adapter holes, and annular positioning adjusting gaps which are basically coaxial with the adapter holes are formed between the adapter holes and the peripheral walls of the branch pipes. At least one branch pipe lining is arranged in a transfer hole of which the aperture is greater than the outer diameter of the corresponding branch pipe, and the branch pipe lining sleeves the corresponding branch pipe and is embedded in the positioning adjusting gap; the inner circumferential wall of the branch pipe lining is connected to the outer circumferential wall of the corresponding branch pipe in a sealed mode through an inner side annular brazing layer, and the branch pipe lining is connected to the transfer hole in a sealed mode through an outer side annular brazing layer and / or a self-fluxing type circumferential weld.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration accessories, and in particular to a branch pipe adapter structure, a refrigerant distributor, a refrigerant collector, and a heat exchange device. Background Technology

[0002] Existing shell-and-tube heat exchangers generally employ a multi-pass, multi-tube structure to improve heat exchange efficiency. The core challenge lies in uniformly distributing the tube-side medium to the densely arranged heat exchange tube array. Although the uniformity of refrigerant distribution can be optimized by configuring a distributor, there is a significant spatial topological contradiction between the branch pipe layout on the distributor and the heat exchange tube arrangement inside the shell-and-tube heat exchanger: for the sake of uniform distribution, the multiple branch pipes on the distributor are arranged in a ring array or a single row; while in a shell-and-tube heat exchanger, multiple heat exchange tubes are usually arranged in a compact row-column arrangement, that is, multiple heat exchange tubes are arranged regularly on the tube sheet in a horizontal and vertical alternating row and column manner.

[0003] The row-and-column arrangement of the heat exchanger tubes and the ring array (or single-row distribution) of the distributor branch pipes create a spatial topological misalignment. The end positions of the branch pipes cannot correspond to the inlet positions of the corresponding heat exchanger tubes. During installation, the end position of each branch pipe must be adjusted individually to match the corresponding heat exchanger tube inlet position. This branch-by-branch correction method is not only difficult and inefficient, but the excessively close pipe spacing also severely limits the precise correction of the end positions of each branch pipe. The accumulation of correction errors and dimensional tolerances can lead to some branch pipes failing to accurately align with the corresponding heat exchanger tube inlets, resulting in assembly difficulties and making it difficult to stably control the weld gap after assembly, which can easily lead to sealing failure. Furthermore, due to the large size of the heat exchanger tube assembly, leak detection is impossible after multiple branch pipes and multiple heat exchanger tubes are sealed together, posing a significant challenge to the welding reliability of this product.

[0004] Furthermore, in existing shell-and-tube heat exchangers, the outlets of all heat exchange tubes converge into the tube box of the heat exchanger and are discharged through refrigerant outlet pipes connected to the box cover. In this structure, the refrigerant outlet pipes are sealed to the box cover with bolts and gaskets. This sealing method not only has low sealing strength but also carries the risk of leakage due to gasket aging. Similarly, some have proposed using collectors for refrigerant collection and discharge. However, this requires solving the spatial topology transformation between the row-and-column arrangement of heat exchange tube outlets and the ring-array distribution of collector branches, as well as the sealing welding problem between the heat exchange tubes and the corresponding collector branches. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides a branch pipe transition structure, a refrigerant distributor, a refrigerant collector, and a heat exchange device. Multiple branch pipes on the refrigerant distributor or collector are arranged in a ring array or a single row. The branch pipe transition structure includes a transition plate and at least one branch pipe bushing. The transition plate has multiple transition holes arranged in rows and columns, at least a portion of which have a diameter larger than the outer diameter of the branch pipe to which they are fitted. A positioning and adjustment gap, substantially coaxial with the transition hole and in an annular shape, is formed between the transition hole and the outer peripheral wall of the branch pipe. At least one branch pipe bushing is disposed in the transition hole with a diameter larger than the outer diameter of the corresponding branch pipe. The branch pipe bushing is sleeved on the corresponding branch pipe and embedded within the positioning and adjustment gap. The inner peripheral wall of the branch pipe bushing is sealed to the outer peripheral wall of the corresponding branch pipe via an inner annular brazed layer, and the branch pipe bushing is sealed to the transition hole via an outer annular brazed layer and / or a self-fusion circumferential weld.

[0006] According to one embodiment of the present invention, the branch pipe bushing includes a bushing body and a flange. The bushing body is basically coaxially embedded in the positioning adjustment gap. The flange overlaps the transition plate near the end surface of the branch pipe. A self-fusion circumferential weld is formed on the overlapping surface of the two to seal the connection between the branch pipe bushing and the transition hole.

[0007] And / or, an outer annular brazing layer is formed between the outer peripheral wall of the bushing body and the wall of the transition hole.

[0008] According to one embodiment of the present invention, the branch pipe bushing further includes an arc transition portion disposed between the bushing body and the flange portion, and an inner solder bearing portion is formed at the arc transition portion to hold the solder forming the inner annular brazing layer.

[0009] According to one embodiment of the present invention, the branch pipe bushing is in the shape of a hollow cylinder, and the end or outer peripheral wall of the branch pipe bushing is sealed to the end of the transition hole by a self-fusion circumferential weld.

[0010] According to one embodiment of the present invention, the branch pipe bushing is in the shape of a hollow cylinder, and the branch pipe bushing is connected to the transition hole through an outer annular brazing layer. An outer solder bearing part is formed on the outer peripheral wall of the branch pipe, the inner peripheral wall of the transition hole, or the surface of the transition plate near the transition hole to hold the solder forming the outer annular brazing layer.

[0011] According to one embodiment of the present utility model, one end of the branch pipe bushing extends into a transition hole, and a transition hole guide section is formed near the end of the branch pipe to guide the branch pipe bushing to be embedded in the positioning adjustment gap. An outer solder bearing part is formed on the inner peripheral wall of the transition hole guide section, and the inner peripheral wall of the transition hole is an inclined inner peripheral wall, an arc inner peripheral wall, or a stepped surface.

[0012] Alternatively, the adapter hole is a cylindrical hole with a basically uniform inner diameter, and the surface of the adapter plate near the adapter hole forms an outer solder bearing part, and the outer solder bearing part is a plane.

[0013] According to one embodiment of the present invention, a transition hole extends from one end of the branch pipe bushing near the end of the branch pipe, and the branch pipe bushing and the end of the branch pipe together serve as a connection end for insertion into the heat exchange tube in the downstream heat exchange equipment.

[0014] According to one embodiment of the present invention, the branch pipe bushing is in the shape of a hollow cylinder, and an inner solder bearing part is formed on the end face of the branch pipe bushing near the end of the branch pipe to hold the solder that forms the inner annular brazing layer. The inner solder bearing part is a plane.

[0015] Alternatively, the branch pipe bushing includes a receiving section near the end of the branch pipe, with a solder bearing section formed on the inner peripheral wall of the receiving section to hold the solder forming the inner annular brazing layer, and the inner peripheral wall of the receiving section being an inclined peripheral wall, a circular arc peripheral wall, or a stepped surface.

[0016] According to one embodiment of the present invention, the branch pipe bushing includes a connecting section and a guide section located on the side of the connecting section away from the end of the branch pipe. The inner diameter of the guide section is larger than the inner diameter of the connecting section. The connecting section is sealed to the outer peripheral wall of the corresponding branch pipe through an inner annular brazing layer.

[0017] According to one embodiment of the present invention, an inner solder bearing portion is formed on the inner peripheral wall of the guide section to hold the solder forming the inner annular brazing layer, and the inner peripheral wall of the guide section is an inclined peripheral wall, an arc peripheral wall, or a stepped surface.

[0018] According to one embodiment of the present invention, an annular gap is formed between the inner peripheral wall of the guide section and the outer peripheral wall of the branch pipe to prevent them from contacting each other. According to another embodiment of the present invention, the branch pipe bushing is a hollow cylinder connected to the transition hole via an outer annular brazing layer. At least one end face of the branch pipe bushing is located within the transition hole, and a total solder bearing portion is formed at the end face of the branch pipe bushing to hold the solder that simultaneously forms the inner and outer annular brazing layers.

[0019] According to one embodiment of the present invention, the branch pipe transition structure further includes a pipe end transition pipe that is sealed and welded to the transition hole or the end of the branch pipe, wherein the outer diameter of the pipe end transition pipe is larger than the outer diameter of the end of the branch pipe so as to be inserted into the rear heat exchange pipe.

[0020] On the other hand, this utility model also provides a refrigerant distributor, which is disposed at the refrigerant inlet of the heat exchange component and is used to evenly distribute the refrigerant into multiple heat exchange tubes of the heat exchange component. The refrigerant distributor includes a distributor body, multiple branch pipes distributed in a ring array or a single row, and a branch pipe transition structure. The branch pipes are sealed and welded to the transition hole or sealed and welded to the transition hole through a branch pipe bushing.

[0021] On the other hand, this utility model also provides a refrigerant collector, which is disposed at the refrigerant outlet of a heat exchange component and is used to collect refrigerant from multiple heat exchange tubes within the heat exchange component. The refrigerant collector includes a collector body, multiple branch pipes arranged in a ring array or a single row, and a branch pipe transition structure. The branch pipes are sealed and welded to the transition hole or sealed and welded to the transition hole through a branch pipe bushing.

[0022] On the other hand, this utility model also provides a heat exchange device, which includes: a heat exchange assembly, a refrigerant distributor, and / or a refrigerant collector. The heat exchange assembly includes a tube sheet and multiple heat exchange tubes connected in rows and columns on the tube sheet. The outer periphery of the adapter plate in the refrigerant distributor or refrigerant collector is sealed and welded to the tube sheet, forming a sealed cavity between the two. The end of each branch tube and / or the corresponding branch tube bushing is inserted into the corresponding heat exchange tube port at the sealed cavity.

[0023] In summary, the branch pipe transition structure provided by this utility model uses multiple transition holes arranged in rows and columns on the transition plate to convert the end positions of multiple branch pipes that are arranged in a ring or single row on the refrigerant distributor (or collector) into a row and column distribution suitable for the heat exchange tube ports. Furthermore, by setting at least a portion of the transition holes to have a diameter larger than the corresponding branch pipe outer diameter, a positioning adjustment gap is formed between the transition holes and the branch pipes to adjust the branch pipe assembly space. This allows multiple branch pipes with different bending states to achieve synchronous alignment during assembly, ultimately achieving a unified conversion of the spatial topology of the multiple branch pipe ends.

[0024] Furthermore, to achieve sealed welding between the branch pipe and the corresponding transition hole at the positioning adjustment gap, this invention adds a branch pipe bushing inside the positioning adjustment gap to precisely control the assembly gap. This ensures that the assembly gap between the outer circumferential wall of the branch pipe and the inner circumferential wall of the branch pipe bushing matches the brazing process requirements. The outer circumferential wall of the branch pipe is sealed to the branch pipe bushing through a continuous and dense metallurgical brazing layer. The branch pipe bushing and the transition hole are sealed to the transition hole through an outer annular brazing layer and / or a self-fusion annular weld. This invention increases the assembly gap between the transition hole and the branch pipe, enabling multiple branch pipes to be precisely and quickly assembled onto the transition plate, thereby achieving a unified conversion of the spatial position of the ends of multiple branch pipes. Based on this, the branch pipe bushing effectively solves the problem of difficult sealing welding between the branch pipe and the transition hole caused by the increased gap, thus ensuring that each branch pipe can be reliably sealed and welded to the corresponding transition hole.

[0025] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] Figure 1 The diagram shown is a structural schematic of the heat exchange device provided in Embodiment 1 of this utility model.

[0027] Figure 2 As shown Figure 1 Enlarged diagram of point A in the middle.

[0028] Figure 3 As shown Figure 1 A schematic diagram of the structure of the distributor body (or collector body) inside the refrigerant distributor.

[0029] Figure 4 As shown Figure 1 A schematic diagram of the refrigerant distributor.

[0030] Figure 5 As shown Figure 4 A partial schematic diagram of the branch pipe transition structure.

[0031] Figure 6 As shown Figure 4 A schematic diagram of the intermediate transfer plate.

[0032] Figure 7 As shown Figure 4 A partial schematic diagram of the refrigerant distributor in which the branch pipes are installed into the corresponding adapter holes.

[0033] Figure 8 As shown Figure 7 A schematic diagram of the structure after the branch pipe bushing is embedded and brazing filler is placed.

[0034] Figure 9 As shown Figure 8 A schematic diagram of the structure after welding, which is also... Figure 4 Enlarged diagram of point B in the middle.

[0035] Figure 10 , Figure 11 , Figure 12 as well as Figure 13 The diagram shown is a partial assembly schematic of the branch pipe and the branch pipe transition structure in another embodiment of this utility model.

[0036] Figures 14 to 27 The diagram shown is a structural schematic of the distributor body in a refrigerant distributor according to another embodiment of the present invention.

[0037] Figure 28 The diagram shown is a structural schematic of the refrigerant distributor provided in Embodiment 2 of this utility model.

[0038] Figure 29 As shown Figure 28 A schematic diagram of the branch pipe transition structure.

[0039] Figure 30 As shown Figure 29 Enlarged diagram of point C in the middle.

[0040] Figure 31 for Figure 30 A schematic diagram of the structure before brazing.

[0041] Figures 32 to 39 This is a partial assembly diagram of the branch pipe and the branch pipe transition structure in another embodiment of the present invention.

[0042] Figure 40 This is a partially enlarged schematic diagram of the branch pipe adapter structure provided in Embodiment 2 assembled in a heat exchange device.

[0043] Figure 41 The diagram shown is a partially enlarged schematic of the branch pipe transition structure and the tube sheet assembly on the heat exchange equipment provided in Embodiment 2.

[0044] Figure 42 The diagram shown is a partial assembly schematic of the branch pipe and the branch pipe transition structure provided in Embodiment 3 of this utility model. Detailed Implementation

[0045] Example 1

[0046] In existing shell-and-tube heat exchangers, the annular or single-row layout of the distributor branches creates a spatial topological misalignment with the row-and-column arrangement of the heat exchange tube ports. This misalignment necessitates adjusting the end positions of each branch before connecting it to the corresponding heat exchange tube. The dense branch spacing not only limits the calibration accuracy but also leads to assembly difficulties and sealing failures due to accumulated errors. Furthermore, the difficulty in detecting leaks after the distributor is welded to the heat exchange components further exacerbates the leakage risk. Similarly, current refrigerant collection methods at the heat exchanger outlet not only have a high risk of sealing leaks but also suffer from a spatial topological contradiction where the collector branches and heat exchange tube outlets do not correspond.

[0047] In view of this, this embodiment provides a branch pipe transition structure, a refrigerant distributor, a refrigerant collector, and a heat exchange device that enable the rapid assembly of distributor branch pipes or collector branch pipes into multiple heat exchange tubes in a shell-and-tube heat exchanger.

[0048] Figure 1The heat exchange device shown in this embodiment includes a heat exchange assembly 900, a refrigerant distributor 800, and a refrigerant collector 800'. The heat exchange assembly 900 includes a tube sheet 901 and multiple heat exchange tubes 902 arranged in rows on the tube sheet 901. The refrigerant distributor 800 is connected to the inlet end of the multiple heat exchange tubes 902 via a branch pipe transition structure 3 provided in this embodiment, distributing the refrigerant evenly within the multiple heat exchange tubes 902. The refrigerant collector 800' is connected to the outlet end of the multiple heat exchange tubes 902 via another branch pipe transition structure 3', collecting the evaporated gaseous refrigerant and outputting it to the outside of the shell-and-tube heat exchanger through a main pipe 7'. Although this embodiment describes a heat exchange device including a refrigerant distributor 800 and a refrigerant collector 800' as an example, this invention does not limit the scope of the invention. In other embodiments, the heat exchange device may only have a refrigerant distributor or only a refrigerant collector.

[0049] Specifically, such as Figure 2 As shown, a sealing cavity 903 is formed between the adapter plate 31 and the tube sheet 901. Multiple branch pipes 2 on the refrigerant distributor 800 are inserted into the inlet end of the heat exchange tube 902 at the sealing cavity 903. Another sealing cavity 903' is formed between the adapter plate 31' and the tube sheet 901. Multiple branch pipes 2' on the refrigerant collector 800' are inserted into the outlet end of the heat exchange tube 902 at the sealing cavity 903'. In the heat exchange equipment provided in this embodiment, both the refrigerant distributor 800 and the refrigerant collector 800' achieve integrated and unified sealing at the connection points of all branch pipes and heat exchange tubes 902 through the branch pipe adapter structure and the sealing cavity formed by the tube sheet 901. This sealing method eliminates the need to individually seal each connection node between branch pipe 2 and heat exchange tube 902, effectively eliminating the point-by-point sealing operation required in multi-pipe systems. It not only reduces the number of sealing points and improves sealing reliability, but also significantly reduces the assembly precision requirements between branch pipe 2 and the corresponding heat exchange tube 902, making it more conducive to the overall assembly of multiple branch pipes 2.

[0050] However, as Figure 1 and Figure 3 As shown, the refrigerant distributor 800 includes a distributor body 1 and multiple branch pipes 2. The multiple branch pipes 2 are assembled into multiple ring-shaped branch pipe holes 11 on the distributor body 1, thus the multiple branch pipes 2 are also arranged in a multiple ring shape. Similarly, the refrigerant collector 800' also includes a collector body 1' and multiple branch pipes 2' arranged in a multiple ring array. Therefore, when assembling the refrigerant distributor 800 and the refrigerant collector 800' into the heat exchange assembly 900, not only must the end topology of the multiple branch pipes be converted from a multiple ring array to a row and column distribution corresponding to the multiple heat exchange tubes 902; but also, based on the socket connection between the two, to avoid refrigerant leakage, it must be ensured that the peripheral wall of each branch pipe 2 is sealed and welded to the corresponding transition hole 311 on the branch pipe transition structure 3.

[0051] To achieve the conversion of the spatial topology at the ends of multiple branch pipes 2 on the refrigerant distributor or collector, and the sealing welding of each branch pipe 2 to the corresponding transition hole 311, this embodiment provides a branch pipe transition structure 3. For example... Figures 4 to 9 As shown, the branch pipe adapter structure 3 provided in this embodiment includes an adapter plate 31 and at least one branch pipe bushing 32. The adapter plate 31 has a plurality of adapter holes 311 arranged in rows and columns. At least a portion of the adapter holes 311 have a diameter larger than the outer diameter of the branch pipe 2 to which they are fitted. A positioning adjustment gap 3110, which is substantially coaxial with the adapter holes 311 and is annular, is formed between the adapter holes 311 and the outer peripheral wall of the branch pipe 2. At least one branch pipe bushing 32 is disposed in the adapter hole 311 with a diameter larger than the outer diameter of the corresponding branch pipe 2. The branch pipe bushing 32 is sleeved on the corresponding branch pipe 2 and embedded in the positioning adjustment gap 3110. The inner peripheral wall of the branch pipe bushing 32 is sealed to the outer peripheral wall of the corresponding branch pipe 2 through an inner annular brazing layer 331. The branch pipe bushing 32 is sealed to the adapter hole 311 through an outer annular brazing layer 332 and / or a self-fusion circumferential weld 333.

[0052] like Figure 4 , Figure 5 as well as Figure 6 As shown, in the branch pipe transition structure 3 provided in this embodiment, the row-and-column distributed transition holes 311 realize the transformation of the ends of multiple branch pipes 2 from a multi-ring array distribution to a row-and-column distribution; and the positioning adjustment gap 3110 between the transition holes 311 and the corresponding branch pipes 2 forms an assembly adjustment space, so that multiple branch pipes with different bending states can be simultaneously assembled on the transition plate 31. In terms of sealing, a branch pipe bushing 32 is added. Utilizing the double-layer structure of the inner and outer parts of the branch pipe bushing 32 and its wall thickness, the large positioning adjustment gap 3110 between the branch pipe 2 and the transition hole 311 is divided into two assembly gaps that meet the welding process requirements. A double independent sealing interface is formed between the branch pipe 2, the branch pipe bushing 32, and the transition hole 311, thereby improving the reliability of the seal.

[0053] The following will combine Figures 4 to 9 The branch pipe adapter structure 3 provided in this embodiment will be described in detail from the perspective of reducing the difficulty of assembling multiple branch pipes and improving the sealing reliability.

[0054] Regarding reducing the difficulty of assembling multiple branch pipes: For the transition hole 311, its ideal diameter is generally close to the outer diameter of the corresponding branch pipe 2, and the two form an assembly gap that meets the brazing requirements to achieve sealed welding, that is, the two are basically close to equal diameter assembly. However, in the actual working condition where the end position of the branch pipe 2 changes from a ring distribution or a single row distribution to a row-column distribution, at least some of the compactly arranged multiple branch pipes 2 need to be bent and adjusted, and the adjustment will cause double spatial interference: some branch pipes 2 have insufficient bending space due to the position restriction of the adjacent branch pipes, and after bending, it is difficult to insert their end into the transition hole 311 which is basically equal in diameter to it; specifically, in a multi-ring ring branch pipe, the branch pipe 2 on the middle ring ring has extremely limited bending space due to the double position restriction of the inner ring branch pipe and the outer ring branch pipe. Meanwhile, some branch pipes, such as the outer branch pipe 2, require significant bending to assemble because their corresponding transition holes 311 deviate considerably from the original annular distribution axis. Larger bends not only challenge the mechanical properties of the branch pipe material but also increase the refrigerant flow resistance due to changes in the curvature of the flow channels within the branch pipe, affecting the uniformity of distribution. Furthermore, the accumulation of form and position tolerances when multiple annularly distributed branch pipes 2 are simultaneously assembled into equal-diameter transition holes 311 further complicates the assembly process.

[0055] Therefore, such as Figure 7 As shown, in this embodiment, at least a portion of the transition holes 311 have a diameter larger than the outer diameter of the branch pipe 2 to which they are assembled. An adjustment space is formed by utilizing the positioning adjustment gap 3110 between the transition holes 311 and the branch pipe 2. When the branch pipe 2 is subject to restricted bending, it can be quickly assembled into the corresponding transition hole 311 using the larger space provided by the positioning adjustment gap 3110. This design transforms the traditional rigid assembly with perfectly matched pipe diameters into an elastic assembly based on the positioning adjustment gap 3110, reducing the bending accuracy requirements when the spatial position of the branch pipe 2's end changes, and mitigating the impact of spatial interference on the transformation of multiple branch pipes 2 from a ring array distribution to a row-column distribution.

[0056] In this embodiment, the end diameters of multiple branch pipes 2 are the same, and the diameter of each transition hole 311 is larger than the outer diameter of the corresponding branch pipe 2. However, this invention does not impose any limitations on this. In other embodiments, for transition holes whose center position is not far from the center of the corresponding branch pipe end before bending, their diameter can also be set to be basically close to the outer diameter of the corresponding branch pipe; while for transition holes that are far from the center, their diameter is set to be larger than the outer diameter of the corresponding branch pipe; that is, the diameters of multiple transition holes are not equal, some diameters are close to the outer diameter of the corresponding branch pipe, while other diameters are larger than the outer diameter of the corresponding branch pipe. Regarding the deviation distance between the center of the transition hole and the center of the corresponding branch pipe end before bending, specifically, it can be calculated by the row projection distance and column projection distance of the center of the transition hole and the center of the corresponding branch pipe end before bending on the transition plate. When at least one of them exceeds a set distance, the diameter of the transition hole can be set to be larger than the outer diameter of the corresponding branch pipe. However, this invention does not impose any limitations on this.

[0057] Specifically, in this embodiment, the diameters of all transition holes 311 are equal and larger than the outer diameter of the corresponding branch pipe 2. However, this utility model does not impose any limitations on this. In other embodiments, the diameter of each transition hole may also be larger than the outer diameter of the corresponding branch pipe, but the diameters of the transition holes may not be equal.

[0058] The positioning adjustment gap 3110 at the adapter hole 311 provides adjustment space for the synchronous assembly of multiple branch pipes 2 on the adapter plate 31. However, this gap design causes the mating clearance between the branch pipe 2 and the adapter hole 311 to exceed the brazing process's adaptability range, posing a risk of welding seal failure. Therefore, as... Figure 8 As shown, in this embodiment, a branch pipe bushing 32 is added inside the positioning adjustment gap 3110, and its double-layer structure forms an inner and outer two-level assembly gap: the inner assembly gap is distributed between the inner peripheral wall of the branch pipe bushing 32 and the outer peripheral wall of the branch pipe 2, and the outer assembly gap is located between the outer peripheral wall of the branch pipe bushing 32 and the wall of the transition hole 311. The double gap design can simultaneously meet the requirements of assembly tolerance adjustment and brazing sealing.

[0059] In this embodiment, the inner circumferential wall of the branch pipe bushing 32 is sealed to the outer circumferential wall of the corresponding branch pipe 2 via an inner annular brazed layer 331, while its outer side is sealed to the transition hole 311 via a self-fusion annular weld 333. Specifically, as shown... Figure 8 and Figure 9As shown, the branch pipe bushing 32 includes a bushing body 321 and a flange 322. The bushing body 321 is substantially coaxially embedded in the positioning adjustment gap 3110. The flange 322 overlaps the transition plate 31 near the end surface of the branch pipe 2. A self-fusion circumferential weld 333 is formed on the overlapping surface of the two, surrounding the transition hole 311 to seal and connect the branch pipe bushing 32 and the transition hole 111. Specifically, the self-fusion circumferential weld 333 is a circumferential weld formed by laser penetration welding. This self-fusion circumferential weld 333 is formed after penetrating the flange 322 and partially melting the transition plate 31 in a direction substantially perpendicular to the flange 322. The self-fusion circumferential weld 333 seals the transition hole 311 and the branch pipe bushing 32 in the entire circumference of the transition hole 311. However, this utility model does not impose any limitations on this. In other embodiments, the self-fusion circumferential weld can also be formed at the edge of the flange, a laser weld that partially melts the flange and the transition plate; or it can be a circumferential weld formed by other self-fusion welding methods such as resistance welding.

[0060] In this embodiment, the flange 322 not only provides a position for the self-fusion welding between the branch bushing 32 and the transition hole 311, but also serves as a limiting part for the branch bushing 32 to be embedded in the positioning adjustment gap 3110. Further, in this embodiment, the branch bushing 32 also includes an arc transition portion 323 disposed between the bushing body 321 and the flange 322. An inner solder bearing portion 32A is formed at the arc transition portion 323 to hold the solder forming the inner annular brazing layer 331, such as... Figure 8 As shown. Specifically, after forming the self-fusion circumferential weld 333, the brazing material is placed at the arc transition part 323 (i.e., the inner brazing material bearing part 32A) for brazing. After the brazing material melts, it will penetrate in a direction to the assembly gap between the inner peripheral wall of the bushing body 321 and the outer peripheral wall of the branch pipe 2, thereby forming a circumferentially continuous inner annular brazing layer 331 to ensure the sealing reliability between the branch pipe 2 and the branch pipe bushing 32.

[0061] Although this embodiment is described using a branch pipe bushing with a flanged portion as an example, the present invention does not limit this to any particular embodiment. In other embodiments, such as Figure 10 As shown, the branch pipe bushing 32 can also be provided in the shape of a hollow cylinder, and the end of the branch pipe bushing 32 is sealed to the end of the transition hole 311 via a self-fusion circumferential weld 333. Alternatively, one end of the branch pipe bushing extends out of the transition hole, and the outer peripheral wall of the branch pipe bushing is sealed to the end of the transition hole via a self-fusion circumferential weld.

[0062] Similarly, although this embodiment uses the branch pipe bushing connected to the transition hole via a self-fusion circumferential weld as an example, this utility model does not impose any limitations on this. In other embodiments, the branch pipe bushing can also be sealed and welded to the transition hole 311 via an outer brazing layer 332. Specifically, as shown... Figure 11As shown, the brazing filler metal can be placed on the surface of the adapter plate 31 at the edge of the flange 322, i.e., at the outer solder bearing portion 32B. During brazing, the brazing filler metal at the outer solder bearing portion 32B melts and directionally penetrates along the assembly gap between the flange 322 and the surface of the adapter plate 311 into the assembly gap between the outer peripheral wall of the bushing body 321 and the wall of the adapter hole 311, thereby forming an outer annular brazing layer 332. At this time, the inner annular brazing layer 331 is also formed by melting the brazing filler metal placed at the arc transition portion 323 (i.e., the inner solder bearing portion 32A). Further, in other embodiments, such as Figure 12 As shown, a branch pipe bushing 32 can also be provided, which simultaneously seals the connection to the transition hole 311 through the outer annular brazed layer 332 and the self-fusion annular weld 333. Figure 12 In the structure shown, after the self-fusion circumferential weld 333 is formed, brazing material is placed on the inner peripheral wall (outer solder bearing part 32B) or near the junction hole 311 at the end close to the distributor body 1 (or collector body 1'). The molten brazing material will penetrate into the assembly gap between the outer peripheral wall of the branch pipe bushing 32 and the inner wall of the junction hole 311, thereby forming an outer annular brazing layer 332.

[0063] In this embodiment, as Figure 8 and Figure 9 As shown, the bushing body 321 includes a connecting section 3211 and a guide section 3212 located on the side of the connecting section 3211 away from the end of the branch pipe 2 (i.e., near the distributor body 1 or collector body 1'). The connecting section 3211 is sealed to the outer peripheral wall of the corresponding branch pipe 2 via an inner annular brazing layer 331. The inner diameter of the guide section 3212 is larger than the inner diameter of the connecting section 3211, forming a guiding structure to facilitate the smooth insertion of the branch pipe bushing 32 into the branch pipe 2. In actual assembly, to meet the assembly clamping requirements, the axial length of the branch pipe bushing 32 needs to be designed to be relatively long (usually higher than the effective welding depth between the branch pipe bushing and the branch pipe). However, the increase in the length of the branch pipe bushing 32 inevitably leads to an increase in its inner surface area. Due to the shape and position tolerances and surface roughness during the processing of branch pipe 2, during the process of branch pipe bushing 32 being fitted onto branch pipe 2 and embedded into the positioning adjustment gap 3110, the inner surface of branch pipe bushing 32 will inevitably come into contact with the outer peripheral wall of branch pipe 2 and generate friction, which will hinder the embedding of branch pipe bushing 32; and the larger the contact area between the two, the greater the frictional resistance will be, and the more difficult it will be to assemble branch pipe bushing 2.

[0064] To address this issue, this embodiment incorporates an annular gap 3214 between the inner circumferential wall of the guide section 3212 and the outer circumferential wall of the branch pipe 2 to ensure complete non-contact. This design allows for a longer axial length of the branch pipe bushing 32 to accommodate assembly clamping, and minimizes the contact area between the branch pipe bushing 32 and the branch pipe 2 while ensuring the length of the connecting section 3211 meets the welding depth requirements of the branch pipe 2. This effectively reduces the assembly resistance when the branch pipe bushing 32 is inserted into the positioning adjustment gap 3110 along the branch pipe 2, thereby reducing assembly difficulty. In this embodiment, as... Figure 8 and Figure 9 As shown, the guide section 3212 is a cylindrical bore section with a large inner diameter, forming a cylindrical annular gap 3214 between it and the outer peripheral wall of the branch pipe 2, which reduces the assembly resistance while guiding the assembly of the branch pipe bushing 32. However, this utility model does not limit this in any way. In other embodiments, such as Figure 13 As shown, the guide section 3212 can also be set as a tapered hole section with a larger inner diameter, forming a tapered annular gap 3214 between it and the outer peripheral wall of the branch pipe 2.

[0065] like Figure 1 As shown, in the heat exchange device provided in this embodiment, the refrigerant distributor 800 and the refrigerant collector 800' have the same structure, that is, the distributor body 1 and the collector body 1' have the same structure and their branch pipes are distributed in a multi-ring annular array, as shown. Figure 3 and Figure 4 As shown. For ease of description, the possible structures of the dispenser body 1 will be described in detail below as an example. However, this utility model does not limit it in any way. In other embodiments, the structure of the collector body may differ from that of the dispenser body, and it may also be... Figures 14 to 27 Any of the structures described above. Furthermore, in other embodiments, the arrangement of the branch pipes on the refrigerant collector may differ from that of the refrigerant distributor; for example, the refrigerant distributor may have a single ring array, while the refrigerant collector may have a multi-ring array.

[0066] like Figure 4As shown, in this embodiment, the distributor body 1 is a structure integrating reflection and mixing. A partition 4 is provided inside the distributor body 1. A cavity 401 with an opening facing the main pipe 7 is formed on the area of ​​the partition 4 opposite to the main pipe 7, and the partition 4 at the cavity 401 protrudes towards the side where the branch pipe 2 is located. The partition 4 divides the inner cavity of the distributor body 1 into a reflection mixing area 101 near the side where the main pipe 7 is located and including the cavity 401, and a mixing and distributing area 102 near the side where the branch pipe 2 is located. Multiple partition holes 41 are formed on the partition 4, arranged in a ring around the axis of the distributor body 1 and connecting the reflection mixing area 101 and the mixing and distributing area 102. The multiple partition holes 41 are configured to correspond one-to-one with multiple branch pipes 2, and when projected along the axial direction of the distributor body 1, the multiple partition holes 41 are located on the partition plane on the outer periphery of the main pipe 7. However, this utility model does not limit the structure of the distributor body in any way. The refrigerant distributor provided in this embodiment can also adopt other structures of distributor body, such as... Figures 14 to 27 As shown.

[0067] exist Figure 14 The distributor body 1 contains a two-stage jet reflection and mixing component 5. The two-stage jet reflection and mixing component 5 includes a primary reflection mixing plate 51, a secondary jet orifice plate 52, and a secondary reflection mixing plate 53, which are sequentially spaced along the refrigerant flow direction within the distributor body 1. The primary reflection mixing plate 51 is positioned opposite the main pipe 7 to reflect and mix the refrigerant jetted into the main pipe 7. Multiple flow holes 511 are formed on the primary reflection mixing plate 51. The secondary jet orifice plate 52 and the primary reflection mixing plate 51 enclose a jet cavity 501, and a secondary jet orifice 521 is formed on the secondary jet orifice plate 52. The refrigerant, after being reflected and mixed by the primary reflection mixing plate 51, collects in the jet cavity 501 through the flow hole 511 and is then jetted to the secondary reflection mixing plate 53 through the secondary jet orifice 521. The secondary reflective mixing plate 53 is distributed opposite to the secondary jet orifice 521 and has multiple guide holes 531, the same number as the branch pipes 2. Each guide hole 531 is substantially coaxial with the corresponding branch pipe 2. The secondary reflective mixing plate 53 reflects and mixes the refrigerant injected into the secondary jet orifice 521, and then distributes it to the multiple branch pipes 2 through the guide holes 531. Specifically, in Figure 14 In the first-stage reflective mixing plate 51, which protrudes towards the side of the second-stage jet orifice plate 52 opposite to the main pipe 7, a first-stage reflective cavity 510 with an opening facing the liquid outlet end of the main pipe 7 is formed. A second-stage reflective cavity 530 is formed on the second-stage reflective mixing plate 53. However, this utility model does not impose any limitations on this.

[0068] Figure 15 and Figure 14 The structures are basically the same, the difference is: Figure 15The distributor body 1 shown also includes a chamber partition plate 54 located downstream of the primary reflective mixing plate 51. The chamber partition plate 54 divides the jet cavity 501 into an upstream chamber 5011 and a downstream chamber 5012. The upstream chamber 5011 is an annular chamber surrounding the primary reflective cavity 510, and the downstream chamber 5012 is connected to the secondary jet hole 521. The chamber partition plate 54 has partition plate through holes that are staggered with the multiple flow holes 511 (due to the viewing angle). Figure 15 (Not shown in the image).

[0069] exist Figure 16 In the distributor body 1, a flat baffle 4' and a conical flow channel forming member 6 are formed inside, and a plurality of baffle holes 41 are formed on the flat baffle 4'. Figure 17 and Figure 16 The structures are basically the same, the difference lies in: Figure 17 In the middle, the flow channel forming element 6 is a spacer whose cross-section remains basically unchanged with its extension direction. Figure 18 In the middle, only a flat partition 4' is formed inside the distributor body 1. Figure 19 In the middle, only the flow channel forming element 6 is formed inside the distributor body 1.

[0070] Figure 20 The middle distributor body 1 has a plug-in structure; Figure 21 The main body of the middle distributor 1 is a Venturi structure; Figure 22 The main body of the middle distributor 1 is a Venturi tube structure; Figure 23 The main body of the middle distributor 1 is a reflective structure; Figure 24 The main body of the middle distributor 1 is an impeller-type structure; Figure 25 The main body of the middle distributor 1 has a conical structure. Figure 26 The distributor body 1 is a perforated plate structure. The specific structure of the distributor body will not be listed one by one in this utility model. Existing refrigerant distributors that can realize refrigerant distribution can be used with the branch pipe adapter structure 3 provided in this embodiment to quickly assemble multiple branch pipes into multiple heat exchange tubes distributed in rows and columns on the shell and tube heat exchanger.

[0071] exist Figure 1 as well as Figures 14 to 26 In the provided refrigerant distributor, multiple branch pipes are arranged in a ring array of one or more loops on the distributor body 1. However, this utility model does not impose any limitation on this. The refrigerant distributor provided in this embodiment can also... Figure 27 The ends of the multiple branch pipes 2, which are distributed in a single row on the tubular distributor shown, are converted into a row-column distribution to match the heat exchange tubes installed in the shell-and-tube heat exchanger.

[0072] Example 2

[0073] This embodiment is basically the same as Embodiment 1 and its variations, except that the structure of the branch pipe bushing 32 and its sealing connection with the transition hole 311 are different. In this embodiment, the branch pipe bushing 32 is a hollow columnar structure, which is sealed to the transition hole 311 through the outer annular brazing layer 332. An outer solder bearing part 32B is formed on the outer peripheral wall of the branch pipe 2, the inner peripheral wall of the transition hole 311, or the surface of the transition plate 31 near the transition hole 311 to hold the solder that forms the outer annular brazing layer 332.

[0074] In this embodiment, as Figures 28 to 31 As shown, one end of the branch pipe bushing 32 extends into a transition hole 311. A guide section 3111 is formed near the end of the branch pipe 2 to guide the branch pipe bushing 32 into the positioning adjustment gap 3110. An outer solder bearing portion 32B is formed on the inner peripheral wall of the guide section 3111. Specifically, as... Figure 30 and Figure 31 As shown, the adapter hole guide section 3111 is a tapered hole section formed by chamfering, and its inclined inner peripheral wall forms the outer solder bearing portion 32B. However, this utility model does not limit this in any way. In other embodiments, the adapter hole guide section may also be a tapered hole section formed by rounding corners, in which case its arc-shaped inner peripheral wall will form the outer solder bearing portion; or, the adapter hole guide section may be a cylindrical hole section with a larger diameter, and the outer solder bearing portion is formed at the stepped surface on its inner peripheral wall.

[0075] Figure 32 The diagram shown is a partial schematic of a branch pipe adapter structure provided in another embodiment of the present invention. In this structure, the adapter hole 311 is a cylindrical hole segment with a basically uniform inner diameter; at this time, an outer solder bearing portion 32B is formed on the surface of the adapter plate 31 near the adapter hole 311, and the outer solder bearing portion 32B is a plane.

[0076] Figure 33 The diagram shown is a partial schematic of a branch pipe adapter structure provided in another embodiment of the present invention. In this structure, an adapter hole 311 extends from one end of the branch pipe bushing 32 near the distributor body 1, and an outer solder bearing portion 32B is formed on the peripheral wall of the adapter hole 311 or on the outer peripheral wall of the branch pipe bushing 32 inside the adapter hole 311.

[0077] In this embodiment, the branch pipe bushing 32 is a hollow cylinder, and its structure differs from the branch pipe bushing 32 with a flanged portion 322 in Embodiment 1. Therefore, correspondingly, the forming method of the inner solder bearing portion 32A also differs from that in Embodiment 1. For example... Figure 30 and Figure 31As shown, in this embodiment, the branch pipe bushing 32 includes a connecting section 3211 and a receiving section 3213 near the end of the branch pipe 2 (i.e., the end away from the distributor body 1). An inner solder bearing portion 32A is formed on the inner peripheral wall of the receiving section 3213 to hold the solder forming the inner annular brazing layer 331. Specifically, the receiving section 3213 is a tapered hole section formed by chamfering or flaring, with its inclined inner peripheral wall serving as the inner solder bearing portion 32A. However, this utility model does not limit this in any way. In other embodiments, the receiving section 3213 can also be a tapered hole section formed by rounded corners, with its arc-shaped inner peripheral wall serving as the inner solder bearing portion 32A, such as... Figure 34 As shown. Alternatively, the receiving section 3213 may be a cylindrical hole section of equal diameter, with an inner solder bearing portion 32A formed at the stepped surface between it and the connecting section 3211, as shown. Figure 35 As shown. Or, as... Figure 36 As shown, the inner solder bearing portion 32A is formed directly on the end face of the branch pipe bushing 32 near the end of the branch pipe 2. At this time, the inner solder bearing portion 32A is a plane.

[0078] In this embodiment, the inner solder bearing portion 32A formed by the inner peripheral wall of the receiving section 3213 and the outer solder bearing portion 32B formed by the inner peripheral wall of the transition hole guide section 3111 are axially separated from each other in the branch pipe bushing 32. This arrangement allows the solder at the inner solder bearing portion 32A to melt and directionally penetrate and fill the assembly gap between the inner peripheral wall of the connecting section 3211 and the outer peripheral wall of the branch pipe 2 during brazing, forming an inner annular brazing layer 331; while the solder at the outer solder bearing portion 32B melts and directionally penetrates and fills the assembly gap between the outer peripheral wall of the branch pipe bushing 2 and the wall of the transition hole 311, thereby forming an outer annular brazing layer 332. The directional flow mechanism of the two solders effectively controls the diffusion path of the brazing solder, ensuring that the inner and outer assembly gaps are uniformly filled with a dense brazing layer, fundamentally eliminating defects such as incomplete welding and broken welding caused by disordered flow of solder in multiple assembly gaps, and significantly improving the sealing reliability of the branch pipe transition structure.

[0079] Although this embodiment uses the extension of the branch pipe bushing to the transition hole 311, thereby axially separating the two solder bearing portions, it does not limit the scope of this invention. In other embodiments, the end face of the branch pipe bushing 32 may be substantially flush with the surface of the transition plate 31 at the transition hole 311. In this case, the receiving section 3213 and the transition hole guide section 3111 on the branch pipe bushing can still be separated based on the peripheral wall of the branch pipe bushing 2, thereby achieving directional penetration of the solder into the corresponding assembly gap, such as... Figure 37 As shown.

[0080] In this embodiment, as Figure 30 and Figure 31As shown, the branch pipe bushing 32 also includes a guide section 3212 disposed opposite to the receiving section 3213 at the other end of the connecting section 3211. The inner diameter of the guide section 3212 is larger than the inner diameter of the connecting section 3211 to form a guide structure for guiding the branch pipe bushing 32 into the positioning adjustment gap 3110, thereby facilitating the assembly of the branch pipe bushing 32. Similar to Embodiment 1, an annular gap 3214 is formed between the guide section 3212 and the outer peripheral wall of the branch pipe 2 to prevent them from contacting each other. The annular gap 3214, in addition to ensuring the axial length of the branch pipe bushing 32 and the required welding depth at the connecting section 3211, greatly reduces the friction area between the branch pipe bushing 32 and the outer peripheral wall of the branch pipe 2, thereby reducing the frictional resistance when the branch pipe bushing 32 is embedded and assembled. Specifically, the guide section 3212 can be a cylindrical hole section with a large inner diameter, forming a cylindrical annular gap 3214 between it and the outer peripheral wall of the branch pipe 2. Or, as Figure 38 As shown, the guide section 3212 can also be a tapered bore section with a larger inner diameter, forming a tapered annular gap 3214 between it and the outer peripheral wall of the branch pipe 2. However, this invention does not impose any limitations on this. In other embodiments, the guide section may not be required on the branch pipe bushing.

[0081] Although this embodiment uses a branch pipe bushing with one end forming a receiving section and the other end forming a guiding section as an example, this invention does not limit it in any way. In other embodiments, such as Figure 39 As shown, the branch pipe bushing 32 can also be configured to have only a guide section 3212 without a receiving section. In this case, an inner solder bearing portion 32A is formed on the inner peripheral wall of the guide section 3212. Similarly, the guide section 3212 can be a rounded, chamfered, or flared tapered hole section, or a cylindrical hole section; the inner solder bearing portion 32A is formed on its inclined inner peripheral wall, arc-shaped inner peripheral wall, or stepped surface. In other embodiments, for a branch pipe bushing with only a guide section, the inner solder bearing portion can also be formed directly on the end face of the branch pipe bushing near the end of the branch pipe; in this case, the inner solder bearing portion is a plane.

[0082] In this embodiment, the branch pipe bushing 32 extends a transition hole 311 from the side near the end of the branch pipe 2 (i.e., the receiving section 3213). The outer diameter of the receiving section 3213 is smaller than the inner diameter at the port of the rear heat exchange tube to be connected. At this time, the receiving section 3213 and the corresponding end of the branch pipe 2 together serve as a connecting end to be inserted into the port of the rear heat exchange tube 902, such as... Figure 40 As shown. Figure 40This is a partially enlarged schematic diagram of the branch pipe transition structure provided in this embodiment after it is assembled into the tube sheet 901 of the heat exchanger. This arrangement can use the receiving section 3213 to reduce the insertion gap between the branch pipe 2 and the corresponding heat exchange tube 902, preventing refrigerant from flowing back into the sealing cavity 903 from the insertion gap. However, this utility model does not limit this in any way. In the heat exchanger provided in this embodiment, a sealing cavity 903 is formed between the transition plate 31 and the tube sheet 901. At this time, even if some refrigerant in the branch flows back into the sealing cavity 903 from the insertion gap, it will not affect the normal distribution or collection of the refrigerant; furthermore, when the sealing cavity 903 is filled with refrigerant, the pressure inside the cavity will also resist the refrigerant backflow. Therefore, in other embodiments, only the end of the branch pipe can be inserted into the corresponding heat exchange tube port, while the branch pipe bushing is not inserted.

[0083] In other embodiments, the insertion gap between the branch pipe 2 and the corresponding heat exchange pipe 902 can also be reduced by adding a pipe end transition pipe 34. Specifically, the pipe end transition pipe 34 is sealed and welded to the transition hole 311 or the end of the branch pipe 2, and the outer diameter of the pipe end transition pipe 34 is larger than the outer diameter of the end of the branch pipe 2 so as to be inserted into the port of the rear heat exchange pipe 902, such as... Figure 41 As shown in the diagram, in this structure, the pipe end transition pipe 34 is a pipe fitting with a basically uniform wall thickness, which includes a transition pipe connecting section 341 and a transition pipe insertion section 342 with a larger inner diameter. A transition hole 311 extends from the end of the branch pipe bushing 32. The transition pipe connecting section 341 is fitted over the branch pipe 2 and abuts against the branch pipe bushing 32. The connection between the transition pipe connecting section 341 and the transition pipe insertion section 342 forms an inner solder bearing portion 32A. During brazing, the solder placed on the inner solder bearing portion 32A penetrates directionally along the assembly gap between the transition pipe connecting section 341 and the branch pipe 2 into the assembly gap between the inner peripheral wall of the branch pipe bushing 32 and the outer peripheral wall of the branch pipe 2, thereby forming an inner annular brazing layer. In this structure, although the inner solder bearing portion 32A is not directly formed on the branch bushing 32, the branch bushing 32 extending out the transition hole 311 also separates the two solder bearing portions 32A and 32B in the axial direction, thereby realizing the directional guidance of the brazing material.

[0084] The possible structures of the distributor body, the collector body, the branch pipes, and the possible arrangements of multiple branch pipes are the same in this embodiment as in Embodiment 1, and will not be repeated here. Similarly, the structures of the refrigerant distributor and the refrigerant collector on the heat exchange equipment can be exactly the same or different.

[0085] Example 3

[0086] This embodiment is basically the same as Embodiment 2 and its variations, except that the solder carrier is formed differently. For example... Figure 42As shown, in this embodiment, the branch pipe bushing 32 is a hollow cylinder and is connected to the transition hole 311 via the outer annular brazing layer 332. At least one end face of the branch pipe bushing 2 is located inside the transition hole 311, and a total solder bearing portion 320 is formed at the end face of the branch pipe bushing 32 to hold the solder that simultaneously forms the inner annular brazing layer 331 and the outer annular brazing layer 332.

[0087] Furthermore, the branch pipe transition structure provided in this embodiment also includes a pipe end transition pipe 34, which extends into the transition hole 111. At this time, another solder bearing portion 32C is formed on the plane of the transition plate 31 near the transition hole 311; during brazing, the solder at the other solder bearing portion 32C melts and penetrates into the assembly gap between the outer peripheral wall of the pipe end transition pipe 34 and the wall of the transition hole 31. In this structure, the transition plate 31, multiple branch pipe bushings 32, multiple pipe end transition pipes 34, and multiple branch pipes 2 are integrally welded together. However, this utility model does not impose any limitations on this aspect.

[0088] In summary, the branch pipe transition structure provided by this utility model uses multiple transition holes arranged in rows and columns on the transition plate to convert the end positions of multiple branch pipes that are arranged in a ring or single row on the refrigerant distributor (or collector) into a row and column distribution suitable for the heat exchange tube ports. Furthermore, by setting at least a portion of the transition holes to have a diameter larger than the corresponding branch pipe outer diameter, a positioning adjustment gap is formed between the transition holes and the branch pipes to adjust the branch pipe assembly space. This allows multiple branch pipes with different bending states to achieve synchronous alignment during assembly, ultimately achieving a unified conversion of the spatial topology of the multiple branch pipe ends.

[0089] Furthermore, to achieve sealed welding between the branch pipe and the corresponding transition hole at the positioning adjustment gap, this invention adds a branch pipe bushing inside the positioning adjustment gap to precisely control the assembly gap. This ensures that the assembly gap between the outer circumferential wall of the branch pipe and the inner circumferential wall of the branch pipe bushing matches the brazing process requirements. The outer circumferential wall of the branch pipe is sealed to the branch pipe bushing through a continuous and dense metallurgical brazing layer. The branch pipe bushing and the transition hole are sealed to the transition hole through an outer annular brazing layer and / or a self-fusion annular weld. This invention increases the assembly gap between the transition hole and the branch pipe, enabling multiple branch pipes to be precisely and quickly assembled onto the transition plate, thereby achieving a unified conversion of the spatial position of the ends of multiple branch pipes. Based on this, the branch pipe bushing effectively solves the problem of difficult sealing welding between the branch pipe and the transition hole caused by the increased gap, thus ensuring that each branch pipe can be reliably sealed and welded to the corresponding transition hole.

[0090] Although the present invention has been disclosed above by way of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection claimed in the claims.

Claims

1. A branch junction structure, characterized by, Applied to refrigerant distributors or collectors, wherein multiple branch pipes on the refrigerant distributor or collector are arranged in a ring array or a single row, and the branch pipe transition structure includes: The adapter plate has multiple adapter holes arranged in rows and columns. At least a portion of the adapter holes have a diameter larger than the outer diameter of the branch pipe to which they are fitted. A positioning and adjustment gap that is substantially coaxial with the adapter hole and annular in shape is formed between the adapter hole and the outer peripheral wall of the branch pipe. At least one branch pipe bushing is provided in a transition hole with a diameter larger than the outer diameter of the corresponding branch pipe. The branch pipe bushing is sleeved on the corresponding branch pipe and embedded in the positioning adjustment gap. The inner peripheral wall of the branch pipe bushing is sealed to the outer peripheral wall of the corresponding branch pipe through an inner annular brazing layer. The branch pipe bushing is sealed to the transition hole through an outer annular brazing layer and / or a self-fusion annular weld.

2. The branch junction structure of claim 1, wherein The branch pipe bushing includes a bushing body and a flange. The bushing body is basically coaxially embedded in the positioning and adjustment gap. The flange overlaps the transition plate near the end surface of the branch pipe. A self-fusion circumferential weld is formed on the overlapping surface of the two to seal the connection between the branch pipe bushing and the transition hole. And / or, an outer annular brazing layer is formed between the outer peripheral wall of the bushing body and the wall of the transition hole.

3. The branch junction structure of claim 2, wherein, The branch pipe bushing also includes an arc transition portion disposed between the bushing body and the flange portion, and an inner solder bearing portion is formed at the arc transition portion to hold the solder forming the inner annular brazing layer.

4. The branch junction structure of claim 1, wherein The branch pipe bushing is in the shape of a hollow cylinder, and the end or outer peripheral wall of the branch pipe bushing is sealed to the end of the transition hole by a self-fusion circumferential weld.

5. The branch junction structure of claim 1, wherein The branch pipe bushing is a hollow cylinder. The branch pipe bushing is connected to the transition hole via an outer annular brazing layer. An outer solder bearing part is formed on the outer peripheral wall of the branch pipe, the inner peripheral wall of the transition hole, or the surface of the transition plate near the transition hole to hold the solder that forms the outer annular brazing layer.

6. The branch junction structure of claim 5, wherein, One end of the branch pipe bushing extends into a transition hole. A transition hole guide section is formed near the end of the branch pipe to guide the branch pipe bushing into the positioning adjustment gap. An outer solder bearing part is formed on the inner peripheral wall of the transition hole guide section. The inner peripheral wall of the transition hole is an inclined inner peripheral wall, an arc inner peripheral wall, or a stepped surface. Alternatively, the adapter hole is a cylindrical hole with a basically uniform inner diameter, and the surface of the adapter plate near the adapter hole forms an outer solder bearing part, and the outer solder bearing part is a plane.

7. The branch junction structure of claim 6, wherein, The branch pipe bushing extends from one end near the end of the branch pipe into a transition hole. The branch pipe bushing and the end of the branch pipe together serve as a connection end for insertion into the heat exchange tube in the downstream heat exchange equipment.

8. The branch junction structure of claim 1, wherein, The branch pipe bushing is hollow cylindrical in shape. An inner solder bearing part is formed on the end face of the branch pipe bushing near the end of the branch pipe to hold the solder that forms the inner annular brazing layer. The inner solder bearing part is a plane. Alternatively, the branch pipe bushing may include a receiving section near the end of the branch pipe, wherein a solder bearing portion is formed on the inner peripheral wall of the receiving section to hold the solder forming the inner annular brazing layer, and the inner peripheral wall of the receiving section may be an inclined peripheral wall, an arc peripheral wall, or a stepped surface.

9. The branch pipe transition structure according to claim 1, characterized in that, The branch pipe bushing includes a connecting section and a guide section located on the side of the connecting section away from the end of the branch pipe. The inner diameter of the guide section is larger than the inner diameter of the connecting section. The connecting section is sealed to the outer peripheral wall of the corresponding branch pipe through an inner annular brazing layer.

10. The branch junction structure of claim 9, wherein, An inner solder bearing portion is formed on the inner peripheral wall of the guide section to hold the solder that forms the inner annular brazing layer, and the inner peripheral wall of the guide section is an inclined peripheral wall, an arc peripheral wall, or a stepped surface.

11. The branch junction structure of claim 9, wherein, An annular gap is formed between the inner peripheral wall of the guide section and the outer peripheral wall of the branch pipe to prevent them from contacting each other.

12. The branch junction structure of claim 1, wherein, The branch pipe bushing is a hollow cylinder and is connected to the transition hole via an outer annular brazing layer. At least one end face of the branch pipe bushing is located inside the transition hole, and a total solder bearing part is formed at the end face of the branch pipe bushing to hold the solder that simultaneously forms an inner annular brazing layer and an outer annular brazing layer.

13. The branch junction structure of claim 1, wherein, The branch pipe transition structure also includes a pipe end transition pipe that is sealed and welded to the transition hole or the end of the branch pipe. The outer diameter of the pipe end transition pipe is larger than the outer diameter of the end of the branch pipe so as to be inserted into the rear heat exchange pipe.

14. A refrigerant dispenser characterized by, The refrigerant distributor is located at the refrigerant inlet of the heat exchange assembly and is used to evenly distribute the refrigerant into multiple heat exchange tubes of the heat exchange assembly. The refrigerant distributor includes: The distributor body and multiple branch pipes arranged in a ring array or a single row; According to any one of claims 1 to 13, the branch pipe is sealed and welded to the transition hole or sealed and welded to the transition hole through a branch pipe bushing.

15. A coolant collector characterized by comprising: The refrigerant collector, located at the refrigerant outlet of the heat exchange assembly, is used to collect refrigerant from multiple heat exchange tubes within the heat exchange assembly. The refrigerant collector includes: The collector body and multiple branch pipes arranged in a ring array or a single row; According to any one of claims 1 to 13, the branch pipe is sealed and welded to the transition hole or sealed and welded to the transition hole through a branch pipe bushing.

16. A heat exchange apparatus, characterized by, Includes: a heat exchange assembly, the refrigerant distributor of claim 14, and / or the refrigerant collector of claim 15; The heat exchange assembly includes a tube sheet and multiple heat exchange tubes connected in rows and columns on the tube sheet; The outer periphery of the adapter plate in the refrigerant distributor or refrigerant collector is sealed and welded to the tube sheet, forming a sealed cavity between the two. The end of each branch pipe and / or the corresponding branch pipe bushing is inserted into the corresponding heat exchange tube port at the sealed cavity.

Images