Gas collecting head, heat exchange device with gas collecting head, and refrigeration system

Abstract

This utility model provides a gas collecting head, a heat exchange device with a gas collecting head, and a refrigeration system. The gas collecting head includes a hollow tubular body, a branch pipe support, multiple branch pipes, and a manifold. The tubular body has a collecting end and branch pipe ends, with the branch pipe ends having an outer diameter D. 0L The outer diameter D1 of the collection end satisfies: 1 ≤ D 0L / D1≤2.5. The branch pipe support component is located at the branch pipe end of the tubular body and includes a planar support portion substantially perpendicular to the axis of the tubular body. Multiple branch pipe holes are formed on the planar support portion, distributed around the axis of the tubular body, with a depth based on the thickness of the planar support portion. Multiple branch pipes are respectively assembled into the multiple branch pipe holes. The tubular body, the branch pipe support component, and the multiple branch pipes are brazed in a furnace. The manifold is welded or integrally formed at the confluence end of the tubular body.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration accessories, and in particular to a gas collecting head, a heat exchange device with a gas collecting head, and a refrigeration system. Background Technology

[0002] In refrigeration systems, heat exchangers typically have a gas collector assembly at the outlet. Its function is to collect the gaseous refrigerant from each circuit after heat exchange and transport it to the compressor, thus achieving refrigerant circulation and heat exchange. For example... Figure 1 As shown, most commonly used gas collecting pipe assemblies are made of copper and structurally include a main gas collecting pipe 80 and multiple branch pipes 90. The circular wall of the main gas collecting pipe 80 has multiple connection holes 801 for welding the branch pipes 90. To improve the welding strength, these holes are usually machined into a flanged structure.

[0003] However, with the continued rise in copper prices, the refrigeration industry is increasingly inclined to use steel or aluminum to replace copper in order to reduce material costs. As for steel, its plastic forming ability is significantly lower than that of copper. Machining connecting holes on a steel main manifold is not only difficult in terms of forming, but also makes it hard to create a sufficiently high flange structure, thus affecting welding reliability. This is especially true when the diameters of branch pipes and the main manifold are similar, making flange processing even more difficult and welding quality harder to guarantee. Furthermore, because multiple branch pipes need to be distributed along the axial direction of the main manifold, the overall structural length is relatively large, making it unsuitable for small refrigeration equipment with limited space.

[0004] With the application of aluminum heat exchangers, aluminum manifold assemblies have gradually been proposed. While aluminum boasts advantages such as low cost and good plasticity, its welding is more difficult, and the weld strength and corrosion resistance are inferior to copper. Therefore, for branch pipes of the same specifications, the connecting holes on the aluminum main manifold require a higher flange height to meet welding strength and corrosion resistance requirements, significantly increasing processing difficulty. Furthermore, because the main manifold and branch pipes in the manifold assembly are vertically distributed, their lateral and longitudinal dimensions are large, making furnace brazing difficult. Therefore, aluminum manifolds are currently mostly brazed manually. This welding method not only has poor reliability but also makes precise control of the input heat difficult; moreover, aluminum has excellent thermal conductivity, and excessive heat can easily cause secondary welding of adjacent branch pipes, leading to leakage risks. To avoid this problem, existing aluminum manifolds often have the connecting holes spaced far apart or staggered (i.e., not on the same busbar). Increasing the spacing will increase the length of the main gas collecting pipe, taking up more space; while staggered arrangement can shorten the pipe length, it will further increase the difficulty of manual brazing due to the inconsistent welding angles of the branch pipes, seriously affecting the welding quality.

[0005] In conclusion, although steel and aluminum have significant cost advantages, limitations in materials and welding processes, especially challenges in welding reliability and structural compactness, currently make it difficult for gas manifold assemblies to effectively replace copper with steel and aluminum. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, this utility model provides a gas collecting head with a compact structure and excellent welding performance, a heat exchange device with a gas collecting head, and a refrigeration system.

[0007] To achieve the above objectives, the first aspect of this utility model provides a gas collecting head for a heat exchanger used in a refrigeration system, comprising a hollow tubular body, a branch pipe support, multiple branch pipes, and a manifold. The tubular body has a collecting end and branch pipe ends, with the branch pipe ends having an outer diameter D. 0L The outer diameter D1 of the collection end satisfies: 1 ≤ D 0L / D1≤2.5. The branch pipe support component is located at the branch pipe end of the tubular body and includes a planar support portion substantially perpendicular to the axis of the tubular body. Multiple branch pipe holes are formed on the planar support portion, distributed around the axis of the tubular body, with a depth based on the thickness of the planar support portion. Multiple branch pipes are respectively assembled into the multiple branch pipe holes. The tubular body, the branch pipe support component, and the multiple branch pipes are brazed in a furnace. The manifold is welded or integrally formed at the confluence end of the tubular body.

[0008] According to an embodiment of the first aspect of the present invention, the cross-section of the branch pipe end is approximately circular, elliptical, or racetrack-shaped, and the outer diameter D of the branch pipe end is... 0L and short outer diameter D 0W The ratio satisfies: 1 ≤ D 0L / D 0W ≤2.7.

[0009] According to an embodiment of the first aspect of the present invention, the branch pipe includes a branch pipe short connector and a branch pipe assembly pipe. One end of the branch pipe short connector is inserted into and welded to the branch pipe hole. Multiple branch pipe short connectors, a branch pipe bearing plate, and a tubular body are brazed in a furnace to form a body assembly. The branch pipe assembly pipe is welded to the other end of the branch pipe short connector on the body assembly.

[0010] According to an embodiment of the first aspect of the present invention, the main body component is a steel structure;

[0011] The branch pipe assembly is an aluminum fitting with its outer sleeve welded to the branch pipe short connector; or, the branch pipe assembly is a steel fitting, with one end sleeved to the branch pipe short connector and the other end forming a branch copper connection section for connecting to the heat exchanger.

[0012] According to an embodiment of the first aspect of the present invention, the tubular body, the branch pipe support member, and the multiple branch pipes are all aluminum components and are formed by one-time brazing in a furnace.

[0013] According to an embodiment of the first aspect of this utility model, the manifold is an aluminum pipe fitting;

[0014] Alternatively, the manifold is made of steel fittings and the ends of the steel fittings are provided with manifold copper connection sections for connecting to external copper pipelines.

[0015] Alternatively, the manifold may include aluminum pipe sections, steel pipe sections, and manifold copper connectors for connecting to external copper piping.

[0016] According to an embodiment of the first aspect of the present invention, the branch pipe support member is a support plate embedded in the branch pipe end of the tubular body, and the peripheral wall of the support plate is welded to the branch pipe end of the tubular body.

[0017] Alternatively, the branch pipe support component may also include a support connection portion formed on the outer periphery of the planar support portion and bent and extended relative to the planar support portion, the support connection portion being sleeved and welded to the end of the tubular body branch pipe.

[0018] A second aspect of this utility model provides a gas collector for a heat exchanger in a refrigeration system, comprising a hollow end cap body, a branch pipe support, multiple branch pipes, and a manifold. The end cap body has a collecting end and a branch pipe end, and the outer diameter D of the branch pipe end of the end cap body is... 0L 'and the outer diameter D1 of the collection end' satisfy: D 0L / D1 ≥ 1.45. A branch pipe support component is installed at the branch pipe end of the end cap body. The branch pipe support component includes a planar support portion substantially perpendicular to the axis of the end cap body. Multiple branch pipe holes are formed on the planar support portion, distributed around the axis of the end cap body, with a hole depth based on the thickness of the planar support portion. Multiple branch pipes are assembled into the multiple branch pipe holes on the planar support portion. The end cap body, the branch pipe support component, and the multiple branch pipes are brazed in a furnace. The manifold is welded to the converging end of the end cap body.

[0019] According to an embodiment of the second aspect of the present invention, the cross-section of the branch pipe end is approximately circular, elliptical, or racetrack-shaped, and the outer diameter D of the branch pipe end is... 0L 'and short outer diameter D 0W The ratio of ' to ' satisfies: 1 ≤ D 0L ' / D 0W ≤2.7.

[0020] According to an embodiment of the second aspect of the present invention, the gas collecting head further includes a manifold short connector, wherein the manifold is welded to the collecting end of the end cap body via the manifold short connector.

[0021] A third aspect of this utility model provides a gas collector for a heat exchanger in a refrigeration system, comprising a steel body assembly, multiple branch pipe assembly pipes, and a manifold. The steel body assembly includes a hollow end cap body, branch pipe support components, branch pipe short connectors, and manifold short connectors; the end cap body has a collecting end and a branch pipe end, and the outer diameter D of the branch pipe end of the end cap body is... 0L'and the outer diameter D1 of the collection end' satisfy: D 0L ' / D1'≥1.45; The branch pipe support component is connected to the branch pipe end of the end cap body and includes a planar support portion that is substantially perpendicular to the axis of the end cap body. Multiple branch pipe holes are distributed around the axis of the end cap body, with a depth based on the thickness of the planar support portion. Multiple branch pipe short connectors are connected to the multiple branch pipe holes. The manifold short connector is connected to the converging end of the end cap body. Multiple components within the steel body assembly are connected by a body brazing layer formed by furnace brazing. Multiple branch pipe assembly pipes are connected to multiple branch pipe short connectors on the steel body assembly via branch pipe brazing layers or branch pipe self-fusion welds. Each branch pipe assembly pipe and its corresponding branch pipe short connector form a single pipe. The manifold is connected to the manifold short connector via a manifold brazing layer or a manifold self-fusion weld. The liquidus lines of the brazing filler in both the branch pipe brazing layer and the manifold brazing layer are lower than the liquidus line of the brazing filler in the body brazing layer.

[0022] According to an embodiment of the third aspect of the present invention, both the branch pipe assembly pipe and the manifold are steel pipe fittings. The end of the branch pipe assembly pipe is provided with a branch pipe copper connecting section, and the end of the manifold is provided with a manifold copper connecting section. Both the brazing layer of the branch pipe and the brazing layer of the manifold are brazing layers suitable for copper-steel welding.

[0023] According to an embodiment of the third aspect of the present invention, both the branch pipe assembly pipe and the manifold are aluminum pipe fittings, and both the brazing layer of the branch pipe and the brazing layer of the manifold are brazing layers suitable for steel-aluminum welding.

[0024] Alternatively, the branch pipe assembly pipe is made of aluminum, the manifold is made of steel and its end is provided with a copper connection section, the brazing layer of the manifold is a brazing layer suitable for copper-steel welding, and the brazing layer of the branch pipe is a brazing layer suitable for steel-aluminum welding.

[0025] According to a fourth aspect of this utility model, a heat exchange device with a gas collecting head is also provided, comprising a heat exchanger and any of the aforementioned gas collecting heads. The heat exchanger has multiple heat exchange tubes. The gas collecting head is disposed at the outlet end of the heat exchanger, and multiple branch pipes on the gas collecting head are respectively connected to the outlets of the multiple heat exchange tubes of the heat exchanger.

[0026] According to an embodiment of the fourth aspect of the present invention, the heat exchange device with a gas collecting head further includes a refrigerant distributor, which is disposed at the inlet end of the heat exchanger and is used to distribute the refrigerant into multiple heat exchange tubes of the heat exchanger.

[0027] The fifth aspect of this utility model also provides a refrigeration system, which includes the heat exchange device with the above-mentioned gas collecting head.

[0028] In summary, in the gas collecting head provided by this utility model, multiple branch pipes are not directly connected to the manifold, but are indirectly connected to the tubular body (or end cap body) through branch pipe support components. The planar support portion on the branch pipe support component has multiple branch pipe holes with a depth determined by its thickness. By adjusting the thickness of the planar support portion, the welding strength of the branch pipes and the corrosion resistance requirements of the weld joint can be met. Simultaneously, this branch pipe hole structure allows it to be formed using a simple stamping process with minimal influence from the material's plasticity, making it well-suited for processing steel and aluminum materials. Furthermore, the multiple branch pipe holes distributed around the axis of the tubular body allow multiple branch pipes to converge circumferentially at the end of the tubular body (or end cap body), significantly reducing the radial dimension of the tubular body (or end cap body). This provides conditions for multiple branch pipes to be welded to multiple branch pipe holes in one go using furnace brazing with consistent welding conditions and excellent welding performance, effectively solving the problems of poor welding quality and secondary weld leakage present in existing manual brazing methods. The gas collecting head provided by this utility model achieves "steel-aluminum substitution for copper" in both processing methods and welding processes through structural improvements, thereby realizing a low-cost, miniaturized, and high-performance design for the gas collecting head.

[0029] 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

[0030] Figure 1 The diagram shown is a structural schematic of an existing gas collection pipe assembly.

[0031] Figure 2 The diagram shown is a structural schematic of the gas collecting head provided in Embodiment 1 of this utility model.

[0032] Figure 3 As shown Figure 2 A schematic diagram of the structure of the main body component.

[0033] Figure 4 As shown Figure 2 Assembly diagram of the central tubular body and branch pipe bearing components.

[0034] Figure 5 As shown Figure 2 A top view of the tubular body.

[0035] Figure 6 The diagram shown is an assembly schematic of the tubular body and branch pipe support in the gas collecting head provided in another embodiment of the present invention.

[0036] Figure 7 The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of this utility model.

[0037] Figure 8The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of this utility model.

[0038] Figure 9 The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of this utility model.

[0039] Figure 10 The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of this utility model.

[0040] Figure 11 The diagram shown is a partial schematic of a gas collecting head provided in another embodiment of this utility model.

[0041] Figure 12 The diagram shown is a structural schematic of a heat exchange device with a gas collecting head provided in Embodiment 1 of this utility model.

[0042] Figure 13 The diagram shown is a structural schematic of a heat exchange device with a gas collecting head provided in another embodiment of this utility model.

[0043] Figure 14 The diagram shown is a structural schematic of the gas collecting head provided in Embodiment 2 of this utility model.

[0044] Figure 15 As shown Figure 14 Assembly diagram of the middle end cap body and the branch pipe bearing component.

[0045] Figure 16 As shown Figure 14 A top view of the middle end cap body.

[0046] Figure 17 The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of this utility model.

[0047] Figure 18 The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of this utility model.

[0048] Figure 19 The diagram shown is a structural schematic of the gas collecting head provided in Embodiment 3 of this utility model.

[0049] Figure 20 As shown Figure 19 A partial schematic diagram.

[0050] Figure 21 The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of this utility model. Detailed Implementation

[0051] Example 1

[0052] Although steel and aluminum materials have a clear cost advantage, they are constrained by... Figure 1Due to limitations such as the forming method of the connecting pipe holes and the welding process of the branch pipes in the existing gas collecting pipe assemblies shown, it is difficult for existing gas collecting pipe assemblies to effectively replace copper with steel or aluminum. In view of this, this embodiment provides a low-cost, miniaturized gas collecting head that can achieve "steel-aluminum replacement of copper".

[0053] like Figure 2 , Figure 3 as well as Figure 4 As shown, the gas collecting head 10 of the heat exchanger used in the refrigeration system provided in this embodiment includes a hollow tubular body 1, a branch pipe support 2, multiple branch pipes 3, and a manifold 4. The tubular body 1 has a collecting end 11 and a branch pipe end 12, and the long outer diameter D of the branch pipe end 12 is... 0L The ratio of the outer diameter D1 of the collector end 11 to the outer diameter D1 satisfies: 1 ≤ D 0L / D1≤2.5. The branch pipe support component 2 is disposed at the branch pipe end 12 of the tubular body 1 and includes a planar support portion 21 substantially perpendicular to the axis of the tubular body 1. The planar support portion 21 has multiple branch pipe holes 22 distributed around the axis of the tubular body 1, with a hole depth based on the thickness of the planar support portion 21. Multiple branch pipes 3 are respectively assembled into the multiple branch pipe holes 22, and the tubular body 1, the branch pipe support component 2, and the multiple branch pipes 3 are formed by furnace brazing. The manifold 4 is welded or integrally formed at the converging end 11 of the tubular body 1.

[0054] In the gas collecting head 10 provided in this embodiment, the multiple branch pipes 3 are not directly connected to the manifold 4, but are installed on the branch pipe ends 12 of the tubular body 1 by means of branch pipe support members 2. The assembly of the branch pipes 3 depends only on the branch pipe support members 2, thus eliminating the structural limitations of the manifold 4. The branch pipe support member 2 is provided with a flat support portion 21, in which multiple branch pipe holes 22 are opened, the depth of which is determined by the thickness of the flat support portion 21. This design allows the branch pipe holes 22 to be formed by a simple stamping process, with less influence from the plastic forming ability of the material. At the same time, the flat support portion 21 provides a flat and easy-to-process platform, creating conditions for the selection of steel or aluminum materials for the branch pipe support member 2. In addition, since the hole depth of the branch pipe holes 22 is determined by the thickness of the flat support portion 21, only the thickness needs to be adjusted to adapt to the welding depth requirements of different branch pipes 3 and the corrosion resistance requirements of different materials for the weld area. This hole depth adjustment method is almost unrestricted by the plastic forming ability of the material, and is suitable for steel with weak forming ability, as well as aluminum with poor corrosion resistance, to meet the welding depth requirements. After achieving "steel-aluminum replacement of copper", ensure that the welding strength and corrosion resistance of the gas collecting head at the branch pipe hole 22 can meet the system requirements.

[0055] Furthermore, the branch pipe support component 2 allows the branch pipe 3 and the manifold 4 to be positioned axially on the tubular body 1. This configuration significantly reduces the radial dimension of the gas collecting head 10, achieving structural miniaturization while enabling multiple branch pipes 3 to be welded to multiple branch pipe holes 22 in a single, consistent welding process. Specifically, the tubular body 1, the branch pipe support component 2, and the multiple branch pipes 3 can be assembled and laid flat in a tunnel furnace, where they are brazed in the furnace to achieve a single-stage welding process. This welding method not only effectively solves the problems of high welding difficulty and unstable quality associated with traditional manual brazing but also avoids the secondary melting and leakage problems that may occur during sequential welding, thus providing reliable support for "steel-aluminum substitution for copper" at the welding process level.

[0056] Due to the limited plasticity of the tubular body 1, this embodiment sets the long outer diameter D of the branch pipe end 12. 0L The ratio of the outer diameter D1 of the collector end 11 to the outer diameter D1 satisfies: 1 ≤ D 0L / D1≤2.5. Preferably, the ratio of the two is set to be close to 1.2 or 1.3. However, this invention does not impose any limitation on this. In other embodiments, D 0L The ratio / D1 can be any value between 1 and 2.5.

[0057] In this embodiment, the tubular body 1 is a hollow tube with an overall approximately circular cross-section, and the outer diameter D of the branch pipe end is... 0L That is, its outer diameter. One end of the tubular body 1 is flared to form a branch end 12; or, its other end is constricted to form a converging end 11. However, this utility model does not limit the cross-sectional shape of the branch end. In other embodiments, the cross-section of the branch end can also be set to be approximately elliptical or racetrack-shaped. In this case, such as Figure 5 As shown, the outer diameter D of the branch pipe end can be controlled. 0L and short outer diameter D 0W The ratio of D 0L / D 0W To limit the outer diameter of the branch pipe ends of the tubular body, so as to avoid excessive lateral dimensions of the tubular body 1; to ensure that the tubular body 1, the branch pipe support 2, and the multiple branch pipes 3 can be assembled and formed in one go by furnace brazing. Preferably, the outer diameter D of the branch pipe ends is set. 0L and short outer diameter D 0W The ratio satisfies: 1 < D 0L / D 0W ≤2.7. However, this utility model does not impose any limitation on this.

[0058] In this embodiment, the branch pipe support member 2 is a support plate embedded within the branch pipe end 12 of the tubular body, and the peripheral wall of the support plate is welded to the branch pipe end 12 of the tubular body. Specifically, Figure 3 and Figure 4In this embodiment, the support plate is a single integral structure. However, this utility model does not limit this in any way. In other embodiments, the number of support plates may also be multiple, with multiple support plates stacked sequentially and each support plate having multiple coaxially distributed through holes. After the multiple support plates are welded together, they form a branch pipe support component, and the coaxial through holes form a branch pipe hole.

[0059] Although this embodiment uses the branch pipe support member 2 as a support plate as an example, the present invention does not limit it in any way. In other embodiments, the branch pipe support member 2 further includes a support connecting portion 23 formed on the outer periphery of the planar support portion 21 and bent and extended relative to the planar support portion 21, the support connecting portion 23 being sleeved and welded to the branch pipe end 12 of the tubular body. Specifically, as Figure 6 As shown, the load-bearing connection 23 can be internally welded to the branch end of the tubular body 1; or, the outer sleeve can be welded to the branch end of the tubular body.

[0060] Due to limitations imposed by the installation dimensions of the customer's heat exchanger and the distribution of system piping, the specifications of branch pipe 3 need to be customized according to different manufacturers. If branch pipe 3 is directly assembled into branch pipe hole 22, the dimensions of branch pipe support component 2 and tubular body 1 can only be determined after the customer places an order specifying the specifications of branch pipe 3. This structure and processing method not only results in a long production cycle and slow order response, but also creates pressure on inventory due to the large number of customized parts produced. To solve this problem, such as... Figure 2 and Figure 3 As shown, in this embodiment, the branch pipe 3 includes a branch pipe short connector 31 and a branch pipe assembly pipe 32. The branch pipe short connector 31 is connected to the corresponding branch pipe hole 22. Specifically, one end of the branch pipe short connector 31 is inserted and welded to the branch pipe hole 22. Multiple branch pipe short connectors 31, the branch pipe support plate 2, and the tubular body 1 are brazed in a furnace to form a body assembly 101. The branch pipe assembly pipe 32 is welded to the other end of the branch pipe short connector 31 on the body assembly 101.

[0061] The inclusion of branch pipe short connectors 31 eliminates the limitations of the installation dimensions of the customer's heat exchanger and the piping distribution on the specifications and welding assembly of the tubular body 1 and the branch pipe support 2. The body assembly 101, composed of the tubular body 1, the branch pipe support 2, and multiple branch pipe short connectors 31, can be pre-processed for storage. Upon receiving a customer order, only the customization of the branch pipe assembly 32 and the welding assembly of the branch pipe assembly 32 and the corresponding branch pipe short connectors 31 are required. This setup not only effectively shortens the product cycle and improves the response speed to customer orders, but also allows for the use of the same body assembly 101 for different specifications of branch pipe assembly 32 by simply widening or narrowing the pipe ends during customization. This achieves a universal design for the body assembly 101, significantly reducing production costs and inventory pressure.

[0062] In this embodiment, the tubular body 1, the branch pipe support 2, and the multiple branch pipe short connectors 31 are all made of steel. These three components are brazed in an oxygen-free copper furnace to form a steel body assembly 101. The steel body assembly 101 not only has high compressive strength, but the oxygen-free copper brazing filler used in its brazing also has excellent fluidity and wettability. During brazing, it can penetrate well into the branch pipe hole 22 and can intermesh with the steel branch pipe support 2 to form a uniform and dense alloy layer, thereby greatly improving the welding strength, weld airtightness, and corrosion resistance at the branch pipe hole 22. However, this invention does not impose any limitations on this. In other embodiments, the components within the body assembly can also be made of other materials, such as all being made of aluminum; or, a combination of steel and aluminum.

[0063] In this embodiment, the branch pipe assembly pipe 32 is an aluminum fitting to match the aluminum heat exchanger tubes on the client heat exchanger. After determining the specifications of the branch pipe assembly pipe 32 based on the dimensions of the client heat exchanger, multiple branch pipe assembly pipes 32 are welded to the corresponding branch pipe short pipes 31 on the main body assembly 101 by steel-aluminum furnace brazing. At this time, the connection between the branch pipe assembly pipe 32 and the corresponding branch pipe short pipe 31 is end welding. Compared with tube-plate welding between the branch pipe short pipe 31 and the branch pipe support 2, end welding not only provides a larger welding operation space and easier control of welding heat capacity, but also has less impact from secondary welding. Therefore, the branch pipe assembly pipe 32 can be brazed to the corresponding branch pipe short pipe 31 by manual brazing, furnace brazing, or induction brazing. Preferably, as Figure 2 As shown, an aluminum branch pipe assembly pipe 32 is welded to a steel branch pipe short connector 31. Since the coefficient of linear expansion of aluminum is greater than that of steel, this arrangement creates compressive stress at the weld between the branch pipe assembly pipe 32 and the branch pipe short connector 31 after welding, effectively preventing weld cracking and stress corrosion caused by tensile stress, thereby improving the weldability of the branch pipe 3. However, this invention does not impose any limitations on this aspect.

[0064] For manifold 4: In this embodiment, as Figure 2 As shown, it is also an aluminum pipe fitting used to connect to the external aluminum piping on the compressor side of the refrigeration system. After the tubular body 1, branch pipe support 2, and multiple branch pipe short connectors 31 are brazed in an oxygen-free copper furnace to form a steel body assembly 101, the aluminum multiple branch pipe assembly pipe 32, aluminum manifold 4, and steel body assembly 101 are formed by brazing in a steel-aluminum furnace. However, this utility model does not impose any limitations on this. In other embodiments, the aluminum manifold can also be connected to the converging end of the tubular body after the body assembly is formed by other brazing methods such as manual aluminum brazing or induction aluminum brazing.

[0065] In this embodiment, since the gas collecting head is tubular, a pipe-end welding structure that is easy to weld and has excellent welding reliability can be formed between it and the manifold 4. Furthermore, in other embodiments, the manifold 4 can also be integrally formed on the tubular body 1. For example... Figure 7 As shown, both are integrally formed aluminum tubular fittings. Figure 7 In the diagram, a dashed line is used to mark the connection between the collecting end 11 and the manifold 4 of the tubular body. However, in actual gas collecting head products, there is no transition boundary at the connection between the collecting end 11 and the manifold 4, nor is there any... Figure 7 The dashed line in the middle.

[0066] Although this embodiment uses aluminum pipe fittings for both branch pipe assembly 32 and manifold 4, this utility model does not impose any limitations on this. When the compressor side has copper external piping, such as... Figure 8 As shown, the branch pipe assembly pipe 32 is still an aluminum pipe fitting to match the aluminum heat exchange tubes on the welding client heat exchanger, but the manifold 4 is a steel pipe fitting, and its pipe end is provided with a manifold copper connection section 43 to match the copper external pipeline on the welding compressor side. Specifically, during welding, the manifold copper connection section 43, the steel manifold 4, and the steel body assembly 101 can be first brazed with tin bronze to form a welding module, and then steel-aluminum brazing is performed with multiple aluminum branch pipe assembly pipes 32.

[0067] Figure 9 The diagram shown is a structural schematic of a gas collecting head provided in another embodiment of the present invention. This structure is similar to... Figure 8 The basic structure is the same, with the difference being that the manifold 4 includes an aluminum pipe section 41, a steel pipe section 42, and a copper connecting section 43 for connecting the external copper piping on the compressor side. The steel pipe section 42 and the copper connecting section 43 are brazed together in a tin bronze furnace, and then brazed together with the aluminum pipe section 41, the steel body assembly 101, and multiple aluminum branch assembly pipes 32 in a steel-aluminum furnace. The inclusion of the aluminum pipe section 41 gives the manifold 4 superior plasticity, allowing it to be better assembled with the external copper piping on the compressor side within the limited space of the refrigeration system. In this structure, the steel pipe section 42 acts as a barrier between the aluminum pipe section 41 and the copper connecting section 43, preventing electrochemical corrosion caused by the galvanic effect when copper and aluminum are in direct contact, thus extending the service life of the compressor-side system piping.

[0068] However, when the heat exchanger in the client's heat exchanger contains copper heat exchange tubes, such as Figure 10 As shown, the branch pipe assembly 32 can also be made of steel, and the end of the branch pipe assembly 32 is provided with a branch pipe copper connection section 33. Similarly, the manifold 4 can also be made of steel, and its end is provided with a manifold copper connection section 43 to match the external copper pipeline on the compressor side. The branch pipe copper connection section 33, the steel branch pipe assembly 32, the steel body assembly 101, the steel manifold 4, and the manifold copper connection section 43 are brazed in a tin bronze furnace.

[0069] Although this embodiment uses the gas collecting head including the branch pipe short connector 31 as an example for description, the present invention does not impose any limitations on this. In other embodiments, the branch pipe 3 may not include the branch pipe short connector, and the branch pipe assembly pipe 32 on the branch pipe 3 may be directly welded to the branch pipe hole 22 on the branch pipe support member 2, such as... Figure 11 As shown. Specifically, the tubular body 1, the branch pipe support 2, and the multiple branch pipes 3 are all aluminum components and are formed by furnace brazing in one step.

[0070] Correspondingly, such as Figure 12 As shown, this embodiment also provides a heat exchange device with a gas collecting head, which includes... Figure 2 The gas collector 10 and heat exchanger 20 are shown. The heat exchanger 20 has multiple aluminum heat exchange tubes 201. The gas collector 10 is located at the outlet end of the heat exchanger 20, and multiple branch pipes 3 on the gas collector 10 are respectively connected to the outlets of the multiple heat exchange tubes 201. Furthermore, the heat exchange device provided in this embodiment also includes a refrigerant distributor 30 connected to the inlet side of the heat exchanger 20. The refrigerant distributor 30 evenly distributes the refrigerant after throttling by the throttling element (such as an expansion valve) into the multiple heat exchange tubes 201 of the heat exchanger 20.

[0071] Although this embodiment uses the gas collecting head 10 applied to a heat exchanger 20 with aluminum heat exchange tubes 201 as an example, this invention does not impose any limitations on it. In other embodiments, Figure 10 The gas collecting head structure shown can also be applied to heat exchangers with copper heat exchange tubes to form a heat exchange device.

[0072] In this embodiment, the heat exchanger 20 is a finned heat exchanger. However, this invention does not limit it in any way. The gas collecting head provided in this embodiment can also be applied to heat exchangers of other structures, such as microchannel heat exchangers, etc. Figure 13 As shown.

[0073] Correspondingly, this embodiment also provides a refrigeration system, which includes the heat exchange device 100 with the gas collecting head described above.

[0074] Example 2

[0075] In Example 1, due to the limited plasticity of the tubular body 1, the outer diameter D of the branch pipe end is... 0L The outer diameter D1 of the collection end must satisfy: 1 ​​≤ D 0L / D1≤2.5. This condition limits the number of branch pipes in the gas collector and makes it difficult to apply to heat exchangers with a large number of heat exchange tubes.

[0076] Therefore, this embodiment provides another gas collecting head 10' with an unlimited number of branch pipes. For example... Figure 14 and Figure 15As shown, the gas collecting head 10' provided in this embodiment includes a hollow end cap body 1', a branch pipe support 2, multiple branch pipes 3, and a collecting pipe 4. The end cap body 1' has a collecting end 11' and a branch pipe end 12', and the outer diameter D of the branch pipe end of the end cap body is... 0L 'and the outer diameter D1 of the collection end' satisfy: D 0L ' / D1'≥1.45. The branch pipe support component 2 is disposed at the branch pipe end 12' of the end cap body. The branch pipe support component 2 includes a planar support portion 21 substantially perpendicular to the axis of the end cap body 1'. Multiple branch pipe holes 22 are formed on the planar support portion 21, distributed around the axis of the end cap body 1', with a hole depth based on the thickness of the planar support portion 21. Multiple branch pipes 3 are assembled into the multiple branch pipe holes 22 on the planar support portion 21. The end cap body 1', the branch pipe support component 2, and the multiple branch pipes 3 are formed by furnace brazing. The manifold 4 is welded to the converging end 11' of the end cap body.

[0077] In the gas collecting head 10' provided in this embodiment, the end cap body 1' can be formed by spinning or stretching processes. 0L The ratio of ' / D1' can differ significantly. This arrangement allows the converging end 11' of the end cap body 1' to meet the assembly requirements of the manifold 4, while its branch end 12' can accommodate the branch support member 2 with a larger cross-section, thereby providing conditions for the converging assembly of multiple branch pipes, so that it can be applied to heat exchangers with a large number of heat exchange tubes.

[0078] Similar to Embodiment 1, the branch pipe support component 2 is provided with a planar support portion 21 and multiple branch pipe holes 22 with a depth determined by the thickness of the planar support portion 21. This configuration allows the gas collecting head 10' provided in this embodiment to be almost unrestricted by the plastic forming ability of the material in terms of the forming method of the branch pipe holes 22 and the adjustment of the hole depth. That is, it can meet the forming requirements of steel with weak plastic forming ability, and also meet the welding depth requirements of aluminum with poor corrosion resistance, thereby realizing the "steel-aluminum substitution for copper" of the gas collecting head 10'. Similarly, with the help of the branch pipe support component 2, multiple branch pipes 3 also converge at the branch pipe end 12' of the end cap body 1', which effectively reduces the radial dimension of the end cap body 1', thereby making it possible to weld multiple branch pipes 3 to multiple branch pipe holes 22 at one time using a consistent and stable furnace brazing process. This configuration effectively solves the problems of high welding difficulty and unstable quality in traditional manual brazing, and also avoids the problem of secondary melting leakage that may occur during sequential welding, providing reliable support for "steel-aluminum substitution for copper" at the welding process level.

[0079] In this embodiment, the cross-section of the branch pipe end 12' of the end cap body is approximately circular, and the outer diameter D of the branch pipe end is... 0L That is, its outer diameter. However, this utility model does not impose any limitation on the cross-sectional shape of the branch end of the end cap body. In other embodiments, the cross-sectional shape of the branch end of the end cap body can also be approximately elliptical or racetrack-shaped. In this case, such as Figure 16 As shown, the outer diameter D of the branch pipe end of the control end cap body can be controlled. 0L 'and short outer diameter D 0W 'ratio D 0L ' / D 0W The outer diameter of the branch pipe end of the end cap body 1 is limited to prevent the lateral dimension of the end cap body 1 from being too large, ensuring that the end cap body 1, the branch pipe support 2, and the multiple branch pipes 3 can be welded together in one go using furnace brazing after assembly. Preferably, the outer diameter D of the branch pipe end of the end cap body 1 is set. 0L 'and short outer diameter D 0W The ratio of ' to ' satisfies: 1 ≤ D 0L ' / D 0W ≤2.7. However, this utility model does not impose any limitation on this.

[0080] For the branch pipe bearing component 2, this embodiment is basically the same as that of Embodiment 1 and its variations.

[0081] The structure of branch pipe 3 is basically the same as in Embodiment 1 and its variations. It can be as follows: Figure 14 As shown, the system includes a branch pipe short connector 31 and a branch pipe assembly pipe 32. One end of the branch pipe short connector 31 is connected to the branch pipe hole 22 on the branch pipe support member 2, and the other end is connected to the branch pipe assembly pipe 32. Alternatively, the branch pipe short connector may not be provided on the branch pipe, and the branch pipe assembly pipe may be directly connected to the branch pipe hole of the branch pipe support member. Similarly, regarding the material of the branch pipe assembly pipe 32, when the client heat exchanger has aluminum heat exchange tubes, the branch pipe assembly pipe 32 may be made of aluminum; while when the client heat exchanger has copper heat exchange tubes, the branch pipe assembly pipe 32 may be made of steel, and the steel pipe section may be provided with a branch pipe copper connection section.

[0082] For manifold 4: In this embodiment, manifold 4 is connected to the collecting end 11' of the end cap body by welding. Specifically, as follows... Figure 14 As shown, the manifold 4 is directly welded to the collecting end 11' of the end cap body. However, this invention does not limit this in any way. In other embodiments, such as Figure 17 As shown, the gas collecting head also includes a manifold short connector 5, and the manifold 4 is welded to the collecting end 11' of the end cover body via the manifold short connector 5. Similar to Embodiment 1, regarding the material of the manifold, when the compressor side has an aluminum external pipeline, the manifold is an aluminum pipe. If the compressor side has a copper external pipeline, the manifold can be a steel pipe fitting with a copper connecting section at its end; alternatively, the manifold includes an aluminum pipe section, a steel pipe section, and a copper connecting section for connecting the copper external pipeline on the compressor side.

[0083] Figure 18The diagram shown is a structural schematic of a gas collecting head 10' provided in another embodiment of the present invention. Both the branch pipe assembly pipe 32 and the manifold 4 of the gas collecting head are steel pipe fittings. The end of the branch pipe assembly pipe 32 is provided with a branch pipe copper connecting section 33 to connect to the copper heat exchange tube on the client heat exchanger, while the end of the manifold 4 is provided with a manifold copper connecting section 43 to connect to the copper external pipeline on the compressor side.

[0084] Example 3

[0085] like Figure 19 and Figure 20 As shown, the gas collector 10” for a heat exchanger in a refrigeration system provided in this embodiment includes a steel body assembly 101, multiple branch pipe assembly pipes 32, and a manifold 4. The steel body assembly 101 includes a hollow end cap body 1', a branch pipe support member 2, a branch pipe short connector 31, and a manifold short connector 5. The end cap body 1' has a collecting end 11' and a branch pipe end 12', and the outer diameter D of the branch pipe end of the end cap body 1' is... 0L 'and the outer diameter D1 of the collection end' satisfy: D 0L ' / D1'≥1.45. The branch pipe support component 2 is connected to the branch pipe end 12' of the end cap body and includes a planar support portion 21 that is substantially perpendicular to the axis of the end cap body 1'. The planar support portion 21 has multiple branch pipe holes (assembled with branch pipe short connectors, so not shown in the figure) distributed around the axis of the end cap body 1' and with a hole depth based on the thickness of the planar support portion 21. Multiple branch pipe short connectors 31 are respectively connected to multiple branch pipe holes; the manifold short connector 5 is connected to the manifold end 11' of the end cap body. Multiple components in the steel body assembly 101 are connected to each other by a body brazing layer 301 formed by furnace brazing. Multiple branch pipe assembly pipes 32 are connected to multiple branch pipe short connectors 31 on the steel body assembly 101 via branch pipe brazing layer 302 or branch pipe self-fusion weld. Each branch pipe assembly pipe 32 and the corresponding branch pipe short connector 31 form a branch pipe 3. The manifold 4 is connected to the manifold short pipe 5 via the manifold brazing layer 303 or the manifold self-fusion weld. The liquidus lines of the brazing filler material in both the branch pipe brazing layer 302 and the manifold brazing layer 303 are lower than the liquidus line of the brazing filler material in the main body brazing layer 301.

[0086] In this embodiment, the steel body assembly 101 allows the specifications of the end cap body 1' and the branch pipe support 2 to be unrestricted by the installation dimensions of the client heat exchanger and the external piping on the compressor side. The body assembly 101 can be pre-processed into a universal body module, thereby improving processing efficiency and reducing processing costs. On the other hand, the steel body assembly 101 allows the welding of multiple branch pipe holes and the end cap body confluence 11' to be performed using oxygen-free copper brazing filler metal with excellent welding fluidity, high post-weld strength, and corrosion resistance to form a body brazing layer 301, ensuring the welding reliability of the body assembly 101.

[0087] In this embodiment, both the branch pipe assembly pipe 32 and the manifold 4 are aluminum fittings to match the aluminum heat exchange tubes in the client heat exchanger and the aluminum external piping on the compressor side, respectively. The branch pipe assembly pipe 32, the manifold 4, and the steel body assembly 101 are formed by brazing in a furnace using brazing filler metal of grade 4047. In this structure, both the branch pipe brazing layer 302 and the manifold brazing layer 303 are brazing layers suitable for steel-aluminum welding, and the liquidus line of the grade 4047 brazing filler metal is lower than the liquidus line of the oxygen-free copper brazing filler metal that forms the body brazing layer 301. However, this invention does not impose any limitations on this aspect. In other embodiments, when the external piping on the compressor side is copper piping, the branch pipe assembly pipe can also be made of aluminum, while the manifold is made of steel and its end is provided with a copper connecting section. The brazing layer of the manifold is a brazing layer suitable for copper-steel welding, such as a tin bronze brazing layer; while the brazing layer of the branch pipe is a brazing layer suitable for steel-aluminum welding, such as the brazing layer formed after welding with 4047 grade brazing filler. The liquidus lines of both tin bronze and 4047 grade brazing filler are lower than the liquidus line of the oxygen-free copper brazing filler that forms the main body brazing layer.

[0088] In other embodiments, when the heat exchange tubes in the client-side heat exchanger are copper fittings and the compressor side has copper external piping, such as Figure 21 As shown, both the branch pipe assembly pipe 32 and the manifold 4 can be made of steel pipes, and the end of the branch pipe assembly pipe 32 is provided with a matching copper heat exchange tube branch copper connection section (due to the viewing angle). Figure 21 (Not shown in the image), the manifold 4 has a manifold copper connection section 43 at its end that matches the external copper piping on the compressor side. The branch pipe copper connection section, branch pipe assembly pipe 32, steel body assembly 1, manifold 4, and manifold copper connection section 43 are formed by furnace brazing; at this time, the branch pipe brazing layer 302 and the manifold brazing layer 303 are both brazing layers suitable for copper-steel welding, such as tin bronze brazing layers. In other embodiments, for Figure 21 The gas collection head structure shown is such that, since both the manifold 4 and the manifold short connector 5 are made of steel, they can also be welded using self-fusion welding (such as argon arc welding or laser welding) to form a self-fusion weld. Similarly, the steel branch assembly pipe 32 can also be connected to the corresponding branch short connector 31 via a branch self-fusion weld.

[0089] Similar to Embodiment 1, the branch pipe support component 2 is provided with a planar support portion 21 and multiple branch pipe holes whose depth is determined by the thickness of the planar support portion 21. This configuration allows the gas collecting head 10” provided in this embodiment to be almost unrestricted by the plastic forming ability of the material in terms of the branch pipe hole forming method and the adjustment of the branch pipe hole depth. It can meet the forming requirements of steel with weak plastic forming ability, and also meet the welding depth requirements of aluminum with poor corrosion resistance, thereby realizing the "steel-aluminum substitution for copper" of the gas collecting head 10”. Similarly, with the help of the branch pipe support component 2, multiple branch pipes 3 also converge at the branch pipe end 12’ of the end cap body 1’, which effectively reduces the radial dimension of the end cap body 1’, and then allows multiple branch pipe short pipes 31 to be welded to multiple branch pipe holes at one time using a consistent and stable furnace welding process. This configuration effectively solves the problems of high welding difficulty and unstable quality in traditional manual brazing, and also avoids the problem of secondary melting leakage that may occur during sequential welding, providing reliable support for "steel-aluminum substitution for copper" at the welding process level.

[0090] For the branch pipe bearing component 2, this embodiment is basically the same as that of Embodiment 1 and its variations.

[0091] In summary, in the gas collecting head provided by this utility model, multiple branch pipes are not directly connected to the manifold, but are indirectly connected to the tubular body (or end cap body) through branch pipe support components. The planar support portion on the branch pipe support component has multiple branch pipe holes with a depth determined by its thickness. By adjusting the thickness of the planar support portion, the welding strength of the branch pipes and the corrosion resistance requirements of the weld joint can be met. Simultaneously, this branch pipe hole structure allows it to be formed using a simple stamping process with minimal influence from the material's plasticity, making it well-suited for processing steel and aluminum materials. Furthermore, the multiple branch pipe holes distributed around the axis of the tubular body allow multiple branch pipes to converge circumferentially at the end of the tubular body (or end cap body), significantly reducing the radial dimension of the tubular body (or end cap body). This provides conditions for the one-time welding of multiple branch pipes using a furnace welding process with consistent welding conditions and excellent welding performance, effectively solving the problems of poor welding quality and secondary weld leakage present in existing manual brazing. The gas collecting head provided by this utility model achieves "steel-aluminum substitution for copper" in both processing methods and welding processes through structural improvements, thereby realizing a low-cost, miniaturized, and high-performance design for the gas collecting head.

[0092] 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 gas collecting head, characterized in that, Heat exchangers used in refrigeration systems and including: The hollow tubular body has a converging end and a branch end, with the branch end having a long outer diameter D. 0L The outer diameter D1 of the collection end satisfies: 1 ≤ D 0L / D1≤2.5; A branch pipe support component is disposed at the branch pipe end of a tubular body and includes a planar support portion that is substantially perpendicular to the axis of the tubular body. The planar support portion has multiple branch pipe holes distributed around the axis of the tubular body and the hole depth is based on the thickness of the planar support portion. Multiple branch pipes are respectively assembled into multiple branch pipe holes. The tubular body, branch pipe bearing components and multiple branch pipes are formed by brazing in a furnace. Manifold, welded or integrally formed at the converging end of a tubular body.

2. The gas collecting head according to claim 1, characterized in that, The cross-section of the branch pipe end is approximately circular, elliptical, or racetrack-shaped, and the outer diameter D of the branch pipe end is... 0L and short outer diameter D 0W The ratio satisfies: 1 ≤ D 0L / D 0W ≤2.

7.

3. The gas collecting head according to claim 1, characterized in that, The branch pipe includes a branch pipe short connector and a branch pipe assembly pipe. One end of the branch pipe short connector is inserted and welded to the branch pipe hole. Multiple branch pipe short connectors, branch pipe bearing plates, and tubular bodies are brazed in a furnace to form a body assembly. The branch pipe assembly pipe is welded to the other end of the branch pipe short connector on the body assembly.

4. The gas collecting head according to claim 3, characterized in that, The main body component is a steel structure; The branch pipe assembly pipe is an aluminum pipe fitting with its outer sleeve welded to the branch pipe short connector; or, the branch pipe assembly pipe is a steel pipe fitting, with one end sleeved to the branch pipe short connector and the other end forming a branch copper connection section for connecting to the heat exchanger.

5. The gas collecting head according to claim 1, characterized in that, The tubular body, branch pipe bearing components, and multiple branch pipes are all aluminum parts and are formed by one-time brazing in a furnace.

6. The gas collecting head according to claim 1, characterized in that, The manifold is made of aluminum. Alternatively, the manifold is a steel pipe fitting and the pipe end of the steel pipe fitting is provided with a manifold copper connection section for connecting to an external copper pipeline. Alternatively, the manifold may include aluminum pipe sections, steel pipe sections, and manifold copper connectors for connecting to external copper pipes.

7. The gas collecting head according to claim 1, characterized in that, The branch pipe support component is a support plate embedded in the branch pipe end of the tubular body, and the peripheral wall of the support plate is welded to the branch pipe end of the tubular body. Alternatively, the branch pipe support member may further include a support connection portion formed on the outer periphery of the planar support portion and bent and extended relative to the planar support portion, the support connection portion being sleeved and welded to the end of the tubular body branch pipe.

8. A gas collecting head, characterized in that, The gas collecting head, used in heat exchangers for refrigeration systems, includes: The hollow end cap body has a converging end and a branch end, with the branch end of the end cap body having a long outer diameter D. 0L 'and the outer diameter D1 of the collection end' satisfy: D 0L ' / D1'≥1.45; A branch pipe support component is disposed at the branch pipe end of the end cap body. The branch pipe support component includes a planar support portion that is substantially perpendicular to the axis of the end cap body. The planar support portion has multiple branch pipe holes distributed around the axis of the end cap body, and the hole depth is based on the thickness of the planar support portion. Multiple branch pipes are assembled with multiple branch pipe holes on the flat bearing part. The end cap body, the branch pipe bearing component, and the multiple branch pipes are formed by brazing in a furnace. The manifold is welded to the converging end of the end cap body.

9. The gas collecting head according to claim 8, characterized in that, The cross-section of the branch pipe end is approximately circular, elliptical, or racetrack-shaped, and the outer diameter D of the branch pipe end is... 0L 'and short outer diameter D 0W The ratio of ' to ' satisfies: 1 ≤ D 0L ' / D 0W ≤2.

7.

10. The gas collecting head according to claim 8, characterized in that, The gas collecting head also includes a manifold short connector, which is welded to the collecting end of the end cap body via the manifold short connector.

11. A gas collecting head, characterized in that, Applied to heat exchangers in refrigeration systems, the gas collecting head includes a steel body assembly, multiple branch pipes, and a manifold. Steel body assembly: including a hollow end cap body, a branch pipe support, a branch pipe short connector, and a manifold short connector; the end cap body has a manifold end and a branch pipe end, and the outer diameter D of the branch pipe end of the end cap body is... 0L 'and the outer diameter D1 of the collection end' satisfy: D 0L ' / D1'≥1.45; The branch pipe support is connected to the branch pipe end of the end cap body and includes a planar support part that is basically perpendicular to the axis of the end cap body. The planar support part has multiple branch pipe holes distributed around the axis of the end cap body and the hole depth is based on the thickness of the planar support part. Multiple branch pipes are connected to multiple branch pipe holes respectively; the manifold is connected to the converging end of the end cap body; multiple components in the steel body assembly are connected by a brazed layer formed by brazing in the furnace. Multiple branch pipe assembly pipes are connected to multiple branch pipe short pipes on the steel body assembly through branch pipe brazing layer or branch pipe self-fusion weld. Each branch pipe assembly pipe and the corresponding branch pipe short pipe form a branch pipe. The manifold is connected to the manifold short pipe via a brazed layer or a self-fusion weld. The liquidus lines of the brazing filler material in both the branch pipe brazing layer and the manifold brazing layer are lower than those in the main body brazing layer.

12. The gas collecting head according to claim 11, characterized in that, Both the branch pipe assembly pipe and the manifold are steel pipe fittings. The branch pipe assembly pipe is provided with a branch pipe copper connection section at its end, and the manifold is provided with a manifold copper connection section at its end. The brazing layer of the branch pipe and the brazing layer of the manifold are brazing layers suitable for copper-steel welding.

13. The gas collecting head according to claim 11, characterized in that, Both the branch pipe assembly pipe and the manifold are aluminum pipe fittings, and the brazing layer of the branch pipe and the brazing layer of the manifold are brazing layers suitable for steel-aluminum welding. Alternatively, the branch pipe assembly pipe is an aluminum pipe fitting, the manifold is a steel pipe fitting with a copper connecting section at its end, the brazing layer of the manifold is a brazing layer suitable for copper-steel welding, and the brazing layer of the branch pipe is a brazing layer suitable for steel-aluminum welding.

14. A heat exchange device with a gas collecting head, characterized in that, include: The heat exchanger has multiple heat exchange tubes; The gas collecting head according to any one of claims 1, 8 or 11 is disposed at the outlet end of the heat exchanger, and the multiple branch pipes on the gas collecting head are respectively connected to the outlet of multiple heat exchange tubes of the heat exchanger.

15. The heat exchanger with a gas collecting head according to claim 14, characterized in that, The heat exchange device with a gas collecting head also includes a refrigerant distributor, which is located at the inlet end of the heat exchanger and is used to distribute the refrigerant into the multiple heat exchange tubes of the heat exchanger.

16. A refrigeration system, characterized in that, Including the heat exchange device with a gas collecting head as described in claim 14.

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