Liquid distribution head branch pipe structure and liquid distribution head

Abstract

The utility model provides a liquid distribution head branch pipe structure and a liquid distribution head. The liquid distribution head branch pipe structure comprises two branch pipe parts, each branch pipe part comprises a stainless steel pipe and a copper connecting pipe connected to the end of the stainless steel pipe in a welded mode, and the stainless steel pipe on one branch pipe part is connected to a liquid distribution head body in a welded mode. Each copper connecting pipe comprises a first assembly section welded with the corresponding stainless steel pipe and a second assembly section only connected with the other copper connecting pipe in a sleeving manner, a sleeving gap is formed between the two copper connecting pipes, and a brazing layer formed by non-furnace brazing is formed in the sleeving gap; the shortest axial distance between the end of the second assembling section of the outer sleeve copper connecting pipe and each stainless steel pipe exposed area is larger than or equal to phi, and phi is the outer diameter of the inner inserting copper connecting pipe.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration accessories, and in particular to a distributor branch pipe structure and a distributor head. Background Technology

[0002] Multi-flow-path small-diameter heat exchangers have advantages such as high heat exchange capacity, low material consumption, small refrigerant charge, and low pressure drop. To ensure that the throttled gas-liquid two-phase refrigerant is evenly distributed into each flow path of the heat exchanger, a distributor head needs to be introduced before the heat exchanger. Traditionally, distributor heads are mainly made of copper, but with the continuous rise in copper prices, distributor heads are gradually developing towards a lower-cost direction of "less copper, replacing copper with steel."

[0003] In traditional copper distributors, the copper connecting pipes are typically welded using flame brazing. Although this method is prone to clogging when welding smaller diameter copper pipes, its advantages of simplicity, flexibility, and efficiency make it the primary welding method for traditional copper distributors. Stainless steel, however, is an alloy material with iron as its base material and including elements such as chromium, nickel, titanium, and manganese. When flame-welded in air, the oxides on its surface have a high melting point, which cannot be reduced even with the addition of flux. Due to the influence of the surface oxides, the bond strength between the brazed layer and the base material is poor, resulting in insufficient connection strength and airtightness of the branch pipes to meet the requirements of the refrigeration system. Therefore, it is difficult to use flame brazing for connecting stainless steel distributor branch pipes. Consequently, current stainless steel distributors primarily employ tunnel furnace brazing with a protective atmosphere. However, to meet the piping layout requirements of the client's refrigeration system, stainless steel branch pipes are generally long; when assembled with the columnar distributor body, they form a complex assembly with large axial and radial dimensions. When welding in a tunnel furnace, large-sized assembly components occupy a lot of space inside the furnace, which seriously affects welding efficiency. This leads to high production costs and is not conducive to the flexible arrangement of small-batch orders for various types and specifications of liquid separators. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a liquid distributor branch pipe structure and liquid distributor head that can achieve efficient welding.

[0005] To achieve the above objectives, this utility model provides a distributor head branch pipe structure, including two branch pipe components. Each branch pipe component includes a stainless steel pipe and a copper pipe welded to the end of the stainless steel pipe, and the stainless steel pipe on one of the branch pipe components is welded to the distributor head body.

[0006] Each copper connector includes a first assembly section welded to the corresponding stainless steel pipe and a second assembly section that is sleeved only with another copper connector. A sleeve gap is formed between the two copper connectors, and a brazing layer not formed by furnace brazing is formed in the sleeve gap. The shortest axial distance from the end of the second assembly section of the outer copper connector to the exposed area of ​​each stainless steel pipe is greater than or equal to Φ, where Φ is the outer diameter of the inner copper connector.

[0007] According to one embodiment of the present invention, at least one of the two copper pipes further includes a flexible connecting section located between the two assembly sections, wherein the flexible connecting section is an area on the copper pipe that is not assembled with other pipe fittings.

[0008] According to one embodiment of the present invention, at least one bend is formed on the flexible connecting segment.

[0009] According to one embodiment of the present invention, in each branch pipe component, a copper connecting pipe is sleeved and connected to the end of the corresponding stainless steel pipe.

[0010] According to one embodiment of the present invention, in the extension direction of the brazing layer, a solder receiving cavity is formed between the two branch pipe components, located at the end of the sleeve gap and used to accommodate the brazing material.

[0011] According to one embodiment of the present invention, the socket gap includes an effective depth area of ​​the brazing layer and an excess solder storage area distributed along the extension direction of the brazing layer; wherein, the effective depth L1 of the brazing layer is ≥0.4Φ, and Φ is the outer diameter of the inner copper tube among the two copper tubes.

[0012] According to one embodiment of the present invention, at least one pipe component has a stainless steel pipe with an outer diameter greater than or equal to 2 mm and less than or equal to 4.5 mm, and a wall thickness greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

[0013] According to one embodiment of the present invention, in the two branch pipe components, the branch pipe component away from the liquid separator body further includes: a copper connecting section welded to the other end of the stainless steel pipe opposite to the copper connecting pipe and used for connecting to external pipelines.

[0014] On the other hand, this utility model also provides a distributor head branch pipe structure, which includes two branch pipe components. Each branch pipe component includes a stainless steel pipe and a copper pipe welded to the end of the stainless steel pipe, and the stainless steel pipe on one of the branch pipe components is welded to the distributor head body.

[0015] The copper connectors on the two branch pipe components are interlocked, and a brazing layer formed in the interlocking gap is formed by brazing other than in-furnace brazing. The stainless steel pipe in one branch pipe component extends out a corresponding copper connector to form a stainless steel extension section. The stainless steel extension section extends into the other branch pipe component. A blocking area is formed at the assembly gap or partition cavity between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the other branch pipe component to prevent the brazing layer from extending to the end face of the stainless steel extension section.

[0016] According to one embodiment of the present invention, the stainless steel extension section extends into the stainless steel pipe of another branch pipe component, and the copper pipe end face corresponding to the stainless steel extension section abuts against the stainless steel pipe end face inside the other branch pipe component. The blocking area is the assembly gap between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the stainless steel pipe inside the other branch pipe component.

[0017] According to one embodiment of the present invention, the stainless steel extension section extends into the stainless steel pipe of another branch pipe component, and the copper pipe end face corresponding to the stainless steel extension section does not abut against the stainless steel pipe end face in the other branch pipe component. The blocking area includes the spacer cavity between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the copper pipe in the other branch pipe component, as well as the assembly gap between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the stainless steel pipe in the other branch pipe component.

[0018] According to one embodiment of the present invention, the stainless steel extension section extends into the copper connector of another branch pipe component, and the blocking area is the spacer cavity between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the copper connector in the other branch pipe component.

[0019] According to one embodiment of the present invention, each copper connector includes a first assembly section and a second assembly section, and the second assembly sections of the two copper connectors are nested together; the shortest axial distance from the end of the second assembly section of the outer copper connector to the exposed area of ​​each stainless steel pipe is greater than or equal to Φ, where Φ is the outer diameter of the inner copper connector.

[0020] According to one embodiment of the present invention, the copper connector inside each branch pipe component is sleeved onto the end of the corresponding stainless steel pipe.

[0021] According to one embodiment of the present invention, at least one pipe component has a stainless steel pipe with an outer diameter greater than or equal to 2 mm and less than or equal to 4.5 mm, and a wall thickness greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

[0022] According to one embodiment of the present invention, in the two branch pipe components, the branch pipe component away from the liquid separator body further includes: a copper connecting section welded to the other end of the stainless steel pipe opposite to the copper connecting pipe and used for connecting to external pipelines.

[0023] On the other hand, this utility model also provides a liquid separator head, which includes multiple liquid separator head branch pipe structures as described above.

[0024] In summary, the branch pipe structure of the distributor provided by this utility model includes two branch pipe components, each of which includes a stainless steel pipe and a copper connecting pipe. The copper connecting pipes in the two branch pipe components are interlocked to form a homogeneous metal weld based on copper material. Compared with stainless steel, the oxide film on the surface of copper material can be reduced and removed after adding brazing flux. The brazing material can also effectively wet the surface of the copper base material and spread out in an air environment, thereby forming a dense, stable, and high-strength brazing layer. This provides conditions for simple, efficient, and flexible non-furnace brazing of long branch pipe components after stainless steeling. At the same time, by controlling the shortest axial distance from the end of the second assembly section of the outer copper connecting pipe to the exposed area of ​​each stainless steel pipe during welding, the thermal influence of welding heat on the crystal phase structure of the stainless steel pipe during non-furnace brazing is effectively reduced, ensuring that the stainless steel pipe has excellent connection strength and pressure resistance after welding. Furthermore, each copper connecting pipe includes a first assembly section welded to the corresponding stainless steel pipe and a second assembly section that is only interlocked with the other copper connecting pipe. This setup allows the welding heat to be applied only to the second assembly section of the two copper pipes during non-furnace brazing. This not only results in shorter heating time and higher welding efficiency, but more importantly, it significantly reduces the input of welding heat, thereby further reducing the thermal impact of welding heat on the stainless steel pipe during non-furnace brazing.

[0025] In addition, a solder receiving cavity can be set at the end of the sleeve gap between the two copper pipes, an excess solder storage area can be set in the sleeve gap, or a stainless steel extension section can be set on a stainless steel pipe to form a blocking area, etc., to effectively avoid welding blockage caused by excess solder or flow soldering when brazing two copper pipes outside the furnace.

[0026] 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

[0027] Figure 1 The diagram shown is a partial schematic of the branch pipe structure of the liquid separator provided in Embodiment 1 of this utility model.

[0028] Figure 2 As shown Figure 1 Enlarged diagram of point A in the middle.

[0029] Figures 3 to 8 The diagram shown is a partial schematic of the branch pipe structure of the liquid separator provided in another embodiment of this utility model. Figure 9 The diagram shown is a schematic diagram of the liquid separator provided in Embodiment 1 of this utility model.

[0030] Figures 10 to 22 The diagram shown is a structural schematic of a liquid separator provided in another embodiment of this utility model.

[0031] Figure 23The diagram shown is a partial schematic of the branch pipe structure of the liquid separator provided in Embodiment 2 of this utility model.

[0032] Figure 24 As shown Figure 23 Enlarged diagram of point B in the middle.

[0033] Figure 25 As shown Figure 24 A schematic diagram of the structure in which the intermediate solder penetrates into the excess solder storage area.

[0034] Figure 26 The diagram shown is a partial schematic of the branch pipe structure of the liquid separator provided in Embodiment 3 of this utility model.

[0035] Figure 27 As shown Figure 26 Enlarged diagram of point C in the middle.

[0036] Figure 28 The image shows brazing. Figure 27 The diagram shown illustrates the flow of brazing filler metal during the distribution head branch pipe structure.

[0037] Figure 29 The diagram shown is a partial schematic of the branch pipe structure of the liquid separator provided in another embodiment of this utility model.

[0038] Figure 30 The diagram shown is a partial schematic of the liquid separator branch pipe structure provided in Embodiment 4 of this utility model before brazing.

[0039] Figure 31 As shown Figure 30 The diagram shows the structure of the distributor branch pipe after brazing.

[0040] Figure 32 As shown Figure 30 The diagram shows another structure formed after the distributor branch pipe structure is brazed.

[0041] Figure 33 The diagram shown is a partial schematic of the liquid separator branch pipe structure provided in Embodiment 5 of this utility model before brazing.

[0042] Figure 34 As shown Figure 33 Enlarged diagram of point D in the middle.

[0043] Figure 35 The image shows brazing. Figure 33 The diagram shown illustrates the flow of brazing filler metal during the distribution head branch pipe structure.

[0044] Figure 36 The diagram shown is a partial schematic of the branch pipe structure of the liquid separator provided in another embodiment of this utility model.

[0045] Figures 37 to 40The diagram shown is a partial schematic of a distributor branch pipe structure with different blocking zones provided in another embodiment of the present invention. Detailed Implementation

[0046] Example 1

[0047] Due to the dense oxide layer on the surface of stainless steel, it is difficult to process the distributor branch pipe in an air environment using efficient welding methods (such as flame brazing) after stainless steeling. Instead, it can only be brazed in a tunnel furnace with a protective atmosphere. Furthermore, the distributor branch pipe is not only long axially, but its radial dimension is also large after assembly with the distributor body. When using tunnel furnace brazing, the number of products that can be welded in one pass is very small, severely impacting production efficiency and costs. At the same time, this welding method is also unsuitable for small-batch customization of distributor heads, which involve many varieties and specifications.

[0048] In view of this, this embodiment provides a distributor branch pipe structure that can be efficiently brazed in an air environment after stainless steeling. This distributor branch pipe structure includes two branch pipe components. Each branch pipe component includes a stainless steel pipe and a copper connector welded to the end of the stainless steel pipe, with the stainless steel pipe of one branch pipe component welded to the distributor head body. Each copper connector includes a first assembly section welded to the corresponding stainless steel pipe and a second assembly section that only sleeves with the other copper connector. A sleeve gap is formed between the two copper connectors, and a brazing layer not formed by furnace brazing is formed within the sleeve gap. The shortest axial distance from the end of the second assembly section of the outer copper connector to the exposed area of ​​each stainless steel pipe is greater than or equal to Φ, where Φ is the outer diameter of the inner copper connector.

[0049] For ease of description, the two branch pipe components are named First Branch Pipe Component 1 and Second Branch Pipe Component 2. Correspondingly, the stainless steel pipe in First Branch Pipe Component 1 is designated by No. 11, and the copper pipe inside is designated by No. 12; the stainless steel pipe in Second Branch Pipe Component 2 is designated by No. 21, and the copper pipe inside is designated by No. 22.

[0050] like Figure 1 As shown, the first assembly section 121 of the copper connector 12 in the first branch pipe component 1 is sleeved over the end of the corresponding stainless steel pipe 11; the first assembly section 221 of the copper connector 22 in the second branch pipe component 2 is also sleeved over the end of the corresponding stainless steel pipe 21. The second end assembly section 222 of the copper connector 22 in the second branch pipe component 2 is inserted into the second assembly section 122 of the copper connector 12 in the first branch pipe component 1, forming a sleeve gap 20 between the two copper connectors. A brazing layer 10, not formed by furnace brazing, is formed within the sleeve gap 20. Figure 1 and Figure 2 Since the socket gap is filled by the brazing layer 10, the socket gap 20 is the location of the brazing layer 10.

[0051] In the distributor branch pipe structure provided in this embodiment, the copper connecting pipes 12 and 22 inside the two branch pipe components are interlocked to form a homogeneous copper metal weld. Compared to the stable oxides such as Cr2O3 (chromium trioxide) and TiO2 (titanium dioxide) formed on the surface of stainless steel, which are difficult to remove with brazing flux, the oxides such as copper oxide, cuprous oxide, or zinc oxide formed on the surface of copper are easily reduced by reducing gas or removed by brazing flux. Therefore, the distributor branch pipe structure provided in this embodiment only requires the use of reducing gas or the addition of brazing flux to braze the two copper connecting pipes 12 and 22 in an air environment, thereby realizing non-furnace brazing of the two branch pipe components 1 and 2 after stainless steeling. The non-furnace brazing of the two branch pipe components 1 and 2 allows each branch pipe component to be processed independently or assembled with other components first, which not only makes the welding method simple and efficient, but also makes the processing method very flexible.

[0052] In this embodiment, each branch pipe component includes a stainless steel pipe and a copper pipe. Since the processing of the branch pipe components involves dissimilar metal welding, tunnel furnace brazing is still used for each branch pipe component. Specifically, the first branch pipe component 1 can be assembled and welded together with the distributor head body, while the second branch pipe component 2 is welded separately. For the first branch pipe component 1, although its assembly with the distributor head body increases the length of the body assembly, its length is very short compared to the integral branch pipe structure. Its impact on the welding efficiency of the distributor head body is limited, or even non-existent. Preferably, the length of the first branch pipe component 1 can be controlled during the design to ensure that the axial length of the assembled body assembly is less than the height of the tunnel furnace. In this case, the body assembly can be placed vertically on the tunnel furnace conveyor belt, and the number of welds per furnace pass is exactly the same as the number of welds per distributor head body welded separately; that is, adding the first branch pipe component 1 does not affect the welding efficiency of the distributor head body.

[0053] For the second branch pipe component 2, although its length is relatively long, its radial dimension is very small (i.e., the diameter of the stainless steel pipe and the copper pipe is small compared to the height of the tunnel furnace). During tunnel furnace brazing, multiple second branch pipe components 2 can be stacked on the conveyor belt of the tunnel furnace to increase the number of passes through at one time, thereby greatly improving welding efficiency. Finally, the second assembly sections 122 and 222 of the two copper pipes are brazed in an air environment, forming a brazed layer 10 within the sleeve gap 20 between them to achieve efficient welding of the stainless steel branch pipe of the distributor head.

[0054] In this embodiment, the length of the first branch pipe component 1, which is assembled and welded to the body of the distributor head, is shorter than the length of the second branch pipe component 2. The length of the branch pipe component refers to the length of the centerline from one end of the branch pipe component to the other end. However, this utility model does not impose any limitation on this. In other embodiments, the two branch pipe components may be set to have substantially the same length; or, the length of the second branch pipe component may be slightly shorter than the length of the first branch pipe component. The stainless steel pipe within each branch pipe component can be either a straight pipe or a bent pipe.

[0055] To more intuitively illustrate the brazing layer 10 between the two copper connectors in the second assembly section 122, 222 of the stainless steel branch pipe structure, this utility model does not specify the brazing layer formed by furnace brazing between the stainless steel pipe and the copper connector within each branch pipe component. However, in actual products, a tin bronze brazing layer or a brazing layer formed by other brazing materials with a liquidus line below 920 degrees Celsius is formed between the stainless steel pipe and the copper connector within each branch pipe component.

[0056] In this embodiment, the brazing layer 10 between the two copper connectors 12 and 22 is formed by flame brazing. Specifically, a brazing position K (such as the welding torch position for flame brazing) is formed at the end of the second assembly section of the outer copper connector after the two copper connectors are sleeved together. Figure 1 and Figure 2 In this embodiment, the outer copper fitting is the copper fitting 12 inside the first branch pipe component, and the brazing position K is the end of the second assembly section 122 of the copper fitting 12. Although this embodiment is described using flame brazing as an example, this utility model does not limit it in any way. In other embodiments, induction brazing, arc brazing, laser brazing, or electron beam brazing, or other non-furnace brazing methods in an air environment, can also be used to form the brazing layer.

[0057] In this embodiment, the stainless steel pipes 11 and 21 in the two branch pipe components are both austenitic stainless steel with high chromium content, which has high heat resistance and corrosion resistance. However, for austenitic stainless steel, the brazing temperature has a significant impact, and the brazing heating temperature of austenitic stainless steel should generally not be too high. Specifically, when the brazing temperature is higher than 1150℃, the grains of austenitic stainless steel begin to grow rapidly, and once the grains grow, they cannot be refined by heat treatment. In addition, for austenitic stainless steels that do not contain stabilizing elements such as titanium or niobium but have a high carbon content, such as 12Cr18N9 and 17Cr18N9, when the brazing temperature remains in the sensitization temperature range (500℃~850℃), chromium carbide will precipitate along the grain boundaries, causing chromium depletion at the grain boundaries, resulting in intergranular corrosion and making the stainless steel material brittle. Furthermore, austenitic stainless steel has a large coefficient of linear expansion, and the brazing temperature will generate large thermal stress inside, which will seriously affect its strength.

[0058] In this embodiment, phosphor bronze brazing filler metal is used for flame brazing of the second assembly sections 122 and 222 of the two copper pipes. The flame brazing temperature is approximately 750°C, which is relatively high and falls within the sensitization temperature range of stainless steel. If the flame directly radiates to the surface of the stainless steel pipes on both sides during brazing, it will not only cause chromium carbide to precipitate inside the stainless steel pipes, severely affecting their connection strength and corrosion resistance, but also cause thermal stress to be generated inside them in a short period of time, further affecting their connection strength. This effect is particularly noticeable when the wall thickness of the stainless steel pipes is relatively thin.

[0059] To address this issue, this embodiment sets the shortest axial distance L01 and L02 from the end of the second assembly section of the outer copper fitting (i.e., welding position K) to the exposed area of ​​each stainless steel pipe to be greater than or equal to Φ, where Φ is the outer diameter of the inner copper fitting. Based on the isolation of the corresponding copper fittings within the shortest axial distances L01 and L02, the brazing flame does not directly radiate to the surface of the stainless steel pipes on both sides, reducing the heat impact on the stainless steel pipes and thus effectively solving the problem of performance degradation of stainless steel pipes caused by direct heat radiation from the flame during brazing.

[0060] In this embodiment, the exposed area refers to the region where the stainless steel pipe is exposed at the first assembly section of the corresponding copper connector. Specifically, when the copper connector is sleeved on the corresponding stainless steel pipe, the exposed area of ​​the stainless steel pipe refers to the outer peripheral wall of the stainless steel pipe at the end of the first assembly section of the copper connector; when the copper connector is inserted into the corresponding stainless steel pipe, the exposed area of ​​the stainless steel pipe refers to the end of the stainless steel pipe at the first assembly section of the copper connector.

[0061] In this embodiment, the copper connector within each branch pipe component is sleeved onto the corresponding stainless steel pipe, and the copper connector 12 within the first branch pipe component is an sleeved copper connector. For example... Figure 1 As shown, within the first branch pipe component 1: the exposed area of ​​the stainless steel pipe 11 is the outer peripheral wall of the stainless steel pipe 11 at the end of the first assembly section 121 of the copper connector; therefore, the axial spacing L01 is the axial spacing from the end of the second assembly section 122 of the copper connector 12 (i.e., at welding position K) to the end of its first assembly section 121. Within the second branch pipe component 2: the exposed area of ​​the stainless steel pipe 21 is the outer peripheral wall of the stainless steel pipe 21 at the end of the first assembly section 221 of the copper connector; therefore, the axial spacing L02 is the axial spacing from the end of the second assembly section 122 of the copper connector 12 (i.e., at welding position K) to the end of the first assembly section 221 of the copper connector 22.

[0062] This invention does not limit the way the two copper pipes are connected. In other embodiments, the copper pipe 22 inside the second branch pipe component 2 can also be fitted over the copper pipe 12 inside the first branch pipe component 1, such as... Figure 3 As shown. At this point, the copper connector 22 inside the second branch pipe component is the outer copper connector, and the end of its second assembly section 222 is the location K of the flame brazing torch. Correspondingly, the two axial distances L01 and L02 are also based on this.

[0063] Although this embodiment illustrates the use of a copper fitting inside a corresponding stainless steel pipe for each branch component, this invention does not limit the scope of the invention. In other embodiments, such as... Figure 4 As shown, two copper connectors can also be installed, each inserted into a corresponding stainless steel pipe. Figure 4 In the first branch pipe component 1, the copper connector 12 is an outer copper connector; in the first branch pipe component 1: the first assembly section 121 of the copper connector 12 is inserted into the corresponding stainless steel pipe 11, and the exposed area of ​​the stainless steel pipe 11 refers to the end of the stainless steel pipe 11 at the first assembly section 121 of the copper connector; the axial spacing L01 is the axial spacing from the end of the second assembly section 122 of the copper connector 12 to the end of the stainless steel pipe 11. In the second branch pipe component 2, the first assembly section 221 of the copper connector 22 is inserted into the stainless steel pipe 21, and the exposed area of ​​the stainless steel pipe 21 refers to the end of the stainless steel pipe 21 at the first assembly section 221; the axial spacing L02 is the axial spacing from the end of the second assembly section 122 of the copper connector 12 to the end of the stainless steel pipe 21. Although Figure 4 In the first branch pipe component, the inner copper connector 12 is an outer copper connector. However, this utility model does not impose any limitation on this. In other embodiments, the inner copper connector of the second branch pipe component may also be used as an outer copper connector.

[0064] Or, as Figure 5 As shown, in one pipe component, the inner copper fitting is sleeved over a corresponding stainless steel pipe, while in the other pipe component, the inner copper fitting is inserted into a corresponding stainless steel pipe. Figure 5 In the first branch pipe component, the copper connector 12 is an outer copper connector. In the first branch pipe component 1: the exposed area of ​​the stainless steel pipe 11 is the end of the stainless steel pipe 11 at the first assembly section 121 of the copper connector; in the second branch pipe component 2: the exposed area of ​​the stainless steel pipe 21 is the outer peripheral wall of the stainless steel pipe 21 at the first assembly section 221 of the copper connector.

[0065] Furthermore, such as Figure 1 As shown, in the branch pipe structure of the distributor provided in this embodiment, the second assembly section 122 of the copper connector 12 in the first branch pipe component is only sleeved with the second assembly section 222 of the copper connector 22. Similarly, the second assembly section 222 of the copper connector 22 is also only sleeved with the second assembly section 122 of the copper connector 12. This arrangement ensures that during flame brazing, the welding heat only needs to heat the second assembly sections 122 and 222 of the two copper connectors, resulting in a short heating time and high welding efficiency. Furthermore, the short brazing time can greatly reduce the input of welding heat, thereby further reducing the impact of welding heat radiation on the stainless steel pipes on both sides during flame brazing, ensuring that the stainless steel pipes in the two branch pipe components have excellent connection strength and forming processing capability after brazing.

[0066] In this embodiment, as Figure 1As shown, the copper connector 22 within the second branch pipe component 2 also includes a flexible connection section 223 located between the two assembly sections (first assembly section 221 and second assembly section 222). In this structure, the flexible connection section 223 is not fitted with other components, thus exhibiting lower hardness and excellent forming and processing capabilities. When the distributor branch pipe structure is connected to an external pipeline, at least one bend can be machined on the flexible connection section 223 so that the end of the second branch pipe component 2 faces the interface of the system pipeline to be connected. However, this invention does not impose any limitations on this. In other embodiments, such as Figure 3 As shown, the copper connector 12 within the first branch pipe component 1 can also include a first assembly section 121, a second assembly section 122, and a flexible connection section 123 located in the intermediate region; similarly, in this structure, the flexible connection section 123 is not sleeved with other components, thus possessing lower hardness and excellent forming and processing capabilities. In other embodiments, both branch pipe components can also have flexible connection sections in their copper connectors, such as... Figure 6 As shown.

[0067] Figure 7 The diagram shows a distributor branch pipe structure provided in another embodiment of this utility model. This structure is similar to... Figure 1 The branch pipe structures shown are basically the same, the difference being that both copper pipes in this structure only include a first assembly section and a second assembly section, without forming a flexible connection section. At this time, the second assembly section 222 of the copper pipe in the second branch pipe component 2 is inserted into the second assembly section 122 of the copper pipe in the first branch pipe component 1, and the inserted end basically abuts against the end of the stainless steel pipe 11 in the first branch pipe component 1. The end of the second assembly section 122 of the copper pipe in the first branch pipe component 1 is also basically flush with the end of the stainless steel pipe 21 in the second branch pipe component 2 in the axial direction. Although... Figure 7 The following description uses the example of the copper connector 22 inside the second branch pipe component being inserted into the copper connector 12 inside the first branch pipe component. However, this utility model does not impose any limitations on this. In other embodiments, the copper connector 12 inside the first branch pipe component may also be inserted into the copper connector 22 inside the second branch pipe component, such as... Figure 8 As shown.

[0068] Within the client-side refrigeration system, the end of the distributor branch pipe needs to connect to the corresponding branch of the heat exchanger to distribute the refrigerant. Due to the distribution of heat exchanger branches within the refrigeration system, the distributor branch pipe usually needs to be bent during installation to change the orientation of its end. To facilitate bending of the distributor branch pipe, this embodiment provides at least one pipe component with a stainless steel pipe having an outer diameter greater than or equal to 2 mm and less than or equal to 4.5 mm, and a wall thickness greater than or equal to 0.18 mm and less than or equal to 0.52 mm. Within this pipe diameter and wall thickness range, the stainless steel pipe has excellent forming and processing capabilities, allowing the end of the distributor branch pipe to be well assembled into the heat exchanger piping within the refrigeration system. Furthermore, with the same wall thickness, the smaller the outer diameter of the stainless steel pipe, the smaller its inner diameter; the refrigerant can maintain a high flow rate within the stainless steel pipe, effectively improving the heat exchange efficiency of the downstream heat exchanger.

[0069] Specifically, in this embodiment, the stainless steel tube 21 in the second branch component 2, located away from the dispensing head body, has an outer diameter greater than or equal to 2 mm and less than or equal to 4.5 mm, and a wall thickness greater than or equal to 0.18 mm and less than or equal to 0.52 mm. The stainless steel tube 11 in the first branch component 1 has a larger diameter to allow the refrigerant, after being uniformly mixed by the dispensing head body, to quickly enter the first branch component 1. Preferably, the outer diameter and wall thickness of the stainless steel tube 21 are any one of φ3.0 mm * 0.3 mm, φ3.3 mm * 0.3 mm, or φ3.6 mm * 0.3 mm. However, this invention does not impose any limitation on this. In other embodiments, the stainless steel tube in the first branch component may also meet the above-mentioned outer diameter and wall thickness requirements; or, the stainless steel tubes in both branch components may both meet the above-mentioned outer diameter and wall thickness requirements.

[0070] Furthermore, for distributor branch pipes with flexible connection sections, bends can be installed on the flexible connection section and / or stainless steel pipes according to the piping layout requirements of the client's refrigeration system during installation, so that the end of the distributor branch pipe can match the corresponding heat exchanger branch interface without interfering with other pipes, making installation very flexible and convenient.

[0071] In the distributor branch pipe structure provided in this embodiment, the end of the second branch pipe component 2, which is away from the distributor head body, is connected to an external pipeline, such as a copper heat exchanger pipeline connected to a refrigeration system. Therefore, this embodiment further includes a copper connecting section 23, which is welded to the other end of the stainless steel pipe 21 opposite to the copper connecting pipe 22 inside the branch pipe component and is used to connect to the external pipeline. Figure 9 As shown. However, this invention does not limit this in any way. In other embodiments, when the distributor branch structure is connected to an aluminum heat exchanger, the second branch component may also include an aluminum connecting section.

[0072] Correspondingly, this embodiment also provides a dispensing head, which includes a dispensing head body 100 and the aforementioned dispensing head branch structure. The dispensing head body 100 is a stainless steel dispensing head body or a dispensing head body mainly made of stainless steel. Figure 9 As shown, the dispensing head body 100 provided in this embodiment has a structure that integrates reflection and mixing. A partition 4 is provided inside the dispensing head body 100. A cavity 401 with an opening facing the inlet hole is formed on the area of ​​the partition 4 opposite to the inlet pipe 3, and the partition 4 at the cavity 401 protrudes and extends towards the side where the inlet pipe hole 101 is located. The partition 4 divides the inner cavity of the dispensing head body into a reflection mixing area 1031 near the inlet end and including the cavity 401, and a mixing distribution area 1032 near the outlet end. A plurality of partition holes 41 are formed on the partition 4 in a ring around the axis of the dispensing head body 100 and connecting the reflection mixing area 1031 and the mixing distribution area 1032. The plurality of partition holes 41 are configured to correspond one-to-one with the plurality of inlet pipe holes 101, and when projected along the axial direction of the dispensing head body 100, the plurality of partition holes 41 are located on the outer periphery of the outlet end of the inlet pipe 3. However, this utility model does not limit the structure of the dispensing head body. The branch tube structure of the dispensing head provided in this embodiment is also applicable to other structures of the dispensing head body 100, such as... Figures 10 to 22 As shown.

[0073] exist Figure 10 The dispensing head body 100 is equipped with 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 and spaced apart along the refrigerant flow direction within the dispensing head body 100. The primary reflection mixing plate 51 is positioned opposite to the inlet pipe 3 to reflect and mix the refrigerant jetted into the inlet pipe 3. 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 502, 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, is collected in the jet cavity 502 through the flow hole 511 and 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 holes 521 and has multiple guide holes 531, the same number as the connecting pipe holes 101. Each guide hole 531 is substantially coaxial with the corresponding connecting pipe hole 101. The secondary reflective mixing plate 53 reflects and mixes the refrigerant injected into the secondary jet holes 521, and then distributes it to the multiple connecting pipe holes 101 through the guide holes 531. Specifically, in Figure 10 In the first-stage reflective mixing plate 51, which protrudes towards the side of the second-stage jet orifice plate 52 opposite to the liquid inlet pipe 3, a first-stage reflective cavity 510 with its opening facing the liquid outlet end of the liquid inlet pipe 3 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.

[0074] Figure 11 and Figure 10 The structures are basically the same, the difference is: Figure 11 The liquid separator head body 100 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 502 into an upstream chamber 5021 and a downstream chamber 5022. The upstream chamber 5021 is an annular chamber surrounding the primary reflective cavity 510, and the downstream chamber 5022 is connected to the secondary jet orifice 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 11 (Not shown in the image).

[0075] exist Figure 12 In the middle, a flat plate baffle 4' and a conical flow channel forming element 6 are formed inside the liquid separator head body 100; a plurality of baffle holes 41 are formed on the flat plate baffle 4'.

[0076] Figure 13 and Figure 12 The structures are basically the same, the difference lies in: Figure 13 In the middle, the flow channel forming element 6 is a spacer whose cross-section remains basically unchanged along its extension direction. Figure 14 In the middle, only a flat baffle 4' is formed inside the body 100 of the separator head. Figure 15 In this structure, only the flow channel forming element 6 is formed inside the liquid dispensing head body 100; in this structure, a Venturi tube section is formed on the liquid inlet pipe 3, and the throat of the Venturi tube section accelerates the refrigerant and jets it into the flow channel forming element 6.

[0077] Figure 16 The body of the central liquid dispensing head 100 has a socket-type structure; Figure 17 The central liquid dispensing head body 100 has a Venturi structure; Figure 18 The body of the central liquid separator 100 is a Venturi tube structure; Figure 19 The central liquid dispensing head body 100 has a reflective structure; Figure 20 The central liquid separator head body 100 has an impeller-type structure; Figure 21 The body of the central liquid dispensing head 100 has a conical structure. Figure 22 The liquid distributor body 100 has an orifice plate structure. The specific structure of the liquid distributor body will not be listed exhaustively in this invention; other liquid distributor body structures that can improve the uniformity of liquid distribution can be combined with the liquid distributor branch pipe structure provided in this embodiment. Similarly, this invention does not limit the structure of the inlet pipe 3; it can be any of the following: a pipe with a basically uniform inner diameter, a Venturi tube, a throttling orifice tube, or an orifice plate structure.

[0078] Example 2

[0079] This embodiment is basically the same as Embodiment 1 and its variations, except that: in the branch pipe structure of the liquid separator provided in this embodiment, the sleeve gap 20 formed by the mutual sleeve of the two copper pipe second assembly sections 122, 222 has an excess solder storage area 202 to form an anti-solder blockage design.

[0080] Compared to furnace brazing, which involves heating the entire base material, non-furnace brazing typically only heats the base material locally. During localized heating, the mass of the base material on both sides of the joint affects its heat absorption; the greater the mass of the base material, the more heat it needs to absorb. In traditional copper distributors, copper branch pipes are connected to multiple branch pipe holes on the distributor head body via flame brazing. The mass of the distributor head body is greater than that of the copper branch pipes, requiring it to absorb more heat during brazing, resulting in a longer welding heating time. Excessive heat absorption by the brazing filler (also known as overheating) can cause weld run, subsequently clogging the end of the inserted copper connector. In the distributor head branch pipe structure provided in this embodiment, the wall thicknesses of the two copper connectors 12 and 22 are approximately the same, but their diameters differ. The copper connector with the larger diameter has a greater mass, thus absorbing more heat, and the brazing filler is more prone to overheating and weld run during brazing. Furthermore, due to the large number of branch pipes in the distributor head and the typically small spacing between them, during flame brazing or other non-furnace brazing, the welding heat inevitably transfers to adjacent branch pipes that have already been welded, causing overheating and resulting in weld blockage. In addition, factors such as the connection gap between the two copper pipes, the precision of controlling the welding operation time, and the wire feed speed can all cause weld blockage.

[0081] To address the issue of welding blockage that easily occurs during non-furnace brazing, this embodiment provides a distributor branch pipe structure with an anti-weld-blockage design. For example... Figure 23 As shown, the second assembly section 122 of the copper pipe inside the first branch pipe component 1 and the second assembly section 222 of the copper pipe inside the second branch pipe component 2 are interlocked to form an interlocking gap 20. The welding position for non-furnace brazing (such as flame brazing) is located at... Figure 23 As indicated by the middle arrow K, during brazing, the brazing filler metal gradually penetrates from the welding position K into the sleeve gap 20 to form a brazing layer 10. Therefore, the extension direction of the brazing layer 10 points from the welding position K into the sleeve gap 20. In this embodiment, as... Figure 24 As shown, the socket gap 20 includes an effective depth region 201 of the brazing layer and an excess solder storage region 202 distributed along the extension direction of the brazing layer 10. The effective depth region 201 refers to the solder filling area formed after the second assembly section 122, 222 of the two copper connectors (non-furnace brazing, such as flame brazing) meets the pressure requirements of the refrigeration system; that is, the length of the brazing layer 10 must be greater than or equal to the length L1 of the effective depth region 201. The effective depth of the brazing layer within the socket gap 20 (i.e., the length of the effective depth region 201) L1 ≥ 0.4Φ, where Φ is the outer diameter of the inner copper connector among the two copper connectors. Figure 23In the diagram, Φ is the outer diameter of the copper connector 22 in the second branch pipe component 2, and L is the length of the sleeve gap 20.

[0082] Figure 23 and Figure 24 This is a schematic diagram showing the structure where the brazing layer 10 extends exactly to the end of the effective depth region 201 of the brazing layer. This schematic diagram represents the structure formed under relatively ideal welding conditions. However, when the branch pipe structure of the distributor experiences flow welding due to excess brazing material, overheating, or secondary welding, the brazing material will seep out from the effective depth region 201 of the brazing layer and enter the excess brazing material storage region 202. That is, the brazing layer 10 extends into the excess brazing material storage region 202. Figure 25 As shown. The excess solder storage area 202 provides redundant space for excess or flow solder to form an anti-soldering design. However, this invention does not limit this in any way. In other embodiments, under more ideal soldering conditions, the solder layer may extend only to the vicinity of the effective depth region of the solder layer.

[0083] Although this embodiment is based on the distributor branch pipe structure shown in Embodiment 1 for anti-welding design, this utility model does not limit it in any way. For other embodiments of the distributor branch pipe structure (such as...) Figures 3 to 8 The anti-solder plug design provided in this embodiment can also be used (as shown), that is, the sleeve gap is set to include an effective depth area of ​​the brazing layer and an excess solder storage area distributed along the extension direction of the brazing layer. The effective depth of the brazing layer (i.e., the length of the effective depth area of ​​the brazing layer) L1≥0.4Φ, where Φ is the outer diameter of the inner copper pipe of the two copper pipes. This embodiment will not be described in detail here.

[0084] Similar to Embodiment 1, the distributor branch pipe structure provided in this embodiment can also be assembled and welded with various stainless steel distributor bodies (or distributor bodies mainly made of stainless steel) to form distributors with various structures, such as... Figures 9 to 22 As shown.

[0085] Example 3

[0086] This embodiment is basically the same as Embodiment 1 and its variations, except that: in the extension direction of the brazing layer 10, a solder receiving cavity 30 is formed between the two branch pipe components, located at the end of the sleeve gap 20 and used to contain the brazing material. The solder receiving cavity 30 is used to store excess or flow solder to form an anti-solder blockage design.

[0087] Specifically, such as Figure 26 and Figure 27As shown, in the first branch pipe component 1: the end of the stainless steel pipe 11 has a flared section 112, and the first assembly section 121 of the copper pipe 12 is inserted into the flared section 112. When assembling two branch pipe components: the second assembly section 222 of the copper pipe in the second branch pipe component 2 is inserted into the second assembly section 122 of the copper pipe in the first branch pipe component 1, and the inserted end extends to the flared section 112 of the stainless steel pipe 11. In this structure, the second assembly section 122 of the copper pipe 12 is only welded to the second assembly section 222 of the copper pipe 22. When performing non-furnace brazing, the welding torch at welding position K only needs to heat the second assembly sections 122 and 222 of the two copper pipes. However, in this embodiment, the first assembly section 121 of the copper pipe 12 is not only connected to the corresponding stainless steel pipe 11, but also brazed to the second assembly section 222 of the copper pipe 22.

[0088] In this embodiment, the socket gap 20 is filled with the brazing layer 10, and the socket gap 20 is the location of the brazing layer 10. The end of the first assembly section 121 of the copper pipe in the first branch pipe component 1, the inclined inner peripheral wall of the flared section 112 of the stainless steel pipe, and the outer peripheral wall of the second assembly section 222 of the copper pipe in the second branch pipe component 2 together form a solder receiving cavity 30 located at the end of the socket gap 20. Figure 28 As indicated by the middle arrow, when there is excess, overheating, or secondary fusion of brazing filler metal, it will inevitably seep out from the sleeve gap 20. The excess brazing filler metal can enter through the sleeve gap 20 and be stored in the solder receiving cavity 30. The brazing filler metal will not seep into the end of the second assembly section 222 of the copper pipe in the second branch pipe component 2 and cause welding blockage. Furthermore, the stored excess brazing filler metal can also form another brazing layer 40 between the end of the first assembly section 121 of the copper pipe in the first branch pipe component 1 and the outer peripheral wall of the second assembly section 222 of the copper pipe in the second branch pipe component 2 to increase the welding strength.

[0089] Although this embodiment is described using the example of a copper fitting 22 in the second branch pipe component extending into the stainless steel pipe 11 of the first branch pipe component to form a solder receiving cavity 30, this invention does not limit the scope of the invention. In other embodiments, such as... Figure 29 As shown, a copper pipe second assembly section 122 connected to the main body of the liquid separator can also be installed in the first branch pipe component 1, with the copper pipe 22 of the second branch pipe component 2 inserted into the copper pipe 22 of the second branch pipe component 2 and the insertion end extending into the flared section 212 of the corresponding stainless steel pipe 21 to form a solder receiving cavity 30.

[0090] In the branch pipe structure of the distributor provided in this embodiment, the inclined peripheral wall of the flared section 112 at the end of the stainless steel pipe 11 makes the solder receiving cavity 30 a closed annular chamber. However, this utility model does not limit this in any way. In other embodiments, the peripheral wall of the pipe fitting surrounding the solder receiving cavity may also be an arc peripheral wall or a combination of an arc peripheral wall and a straight peripheral wall; or, the solder receiving cavity may be an open chamber.

[0091] Example 4

[0092] This embodiment is basically the same as Embodiment 3 and its variations, the difference being: (as follows) Figure 30 As shown, the socket gap 20 includes an effective depth area 201 of the brazing layer and an excess solder storage area 202 distributed along the extension direction of the brazing layer 10. The excess solder storage area 202 and the solder receiving cavity 30 form a two-stage anti-solder blockage design.

[0093] Figure 31 This is a schematic diagram showing the structure where the brazing layer 10 extends exactly to the end of the effective depth region 201 of the brazing layer. This schematic diagram represents the structure formed under relatively ideal welding conditions. However, when the branch pipe structure of the distributor experiences flow welding due to excess brazing material, overheating, or secondary welding, the brazing material will seep out from the effective depth region 201 of the brazing layer and enter the excess brazing material storage region 202. That is, the brazing layer 10 extends into the excess brazing material storage region 202. Figure 32 As shown, the excess solder storage area 202 provides redundant space for excess or flow solder, forming a primary anti-soldering design. Furthermore, when the excess solder storage area 202 is full, the solder will enter the solder receiving cavity 30, where a secondary anti-soldering design is formed to effectively prevent solder from clogging the refrigerant flow path in the distributor branch pipe.

[0094] Example 5

[0095] As described in Example 2, during non-furnace brazing, the base material is locally heated. Due to the different heat absorption of the base material on both sides of the weld joint, the brazing material is prone to overheating, leading to weld run. In addition, due to the characteristics of the multi-branch head with small branch spacing, the control precision of the welding time, and the wire feeding rate, the brazing material will inevitably run during non-furnace brazing, which will then cause weld blockage.

[0096] Based on the same design concept, this embodiment also provides another distributor branch pipe structure that, after stainless steeling, can be efficiently brazed in an air environment and effectively avoids welding blockage. This distributor branch pipe structure includes two branch pipe components. Each branch pipe component includes a stainless steel pipe and a copper connecting pipe welded to the end of the stainless steel pipe, with the stainless steel pipe of one branch pipe component welded to the distributor head body. The copper connecting pipes on the two branch pipe components are interlocked, and a brazing layer 10, not formed by furnace brazing, is formed within the interlocking gap. The stainless steel pipe in one branch pipe component extends out to form a corresponding copper connecting pipe to form a stainless steel extension section. The stainless steel extension section extends into the other branch pipe component. A blocking area 50 is formed at the assembly gap or partition cavity between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the other branch pipe component to prevent the brazing layer 10 from extending towards the end face of the stainless steel extension section.

[0097] Similar to Embodiment 1, in the branch pipe structure of the distributor provided in this embodiment, the copper connecting pipes 12 and 22 are configured as two stainless steel branch pipe components 1 and 2, which allows for efficient, low-cost, and flexible non-furnace brazing. This welding method also allows each branch pipe component to be processed independently or assembled with other components first, greatly improving the flexibility and efficiency of branch pipe component processing. The efficient branch pipe component processing and subsequent rapid non-furnace brazing together make the branch pipe structure of the distributor provided in this embodiment not only highly efficient but also flexible, well-suited for small-batch customization of various types and specifications of distributor heads. Furthermore, unlike the anti-weld-clogging design in Embodiments 2 and 3 which uses a solder receiving cavity and / or excess solder storage area, this embodiment forms a blocking area 50 based on a stainless steel extension section. The blocking area 50 effectively blocks the flow path of the brazing material to avoid flow, thereby solving the welding blockage problem.

[0098] For ease of description, the copper pipe 12 in the first branch pipe component 1 is defined as including a first assembly section 121 and a second assembly section 122; the copper pipe 22 in the second branch pipe component 2 also includes a first assembly section 221 and a second assembly section 222. The second assembly sections 122 and 222 of the two branch pipe components are nested together and welded together by a brazing layer 10.

[0099] Specifically, such as Figure 33 and Figure 34 As shown, in this embodiment, the stainless steel pipe 21 inside the second branch pipe component 2 extends into a second assembly section 222 of the corresponding copper connector 22 to form a stainless steel extension section 211. When assembling the two copper connectors 12, 22, the stainless steel extension section 211 is inserted into the stainless steel pipe 11 of the first branch pipe component 1, and the end face of the second assembly section 222 of the copper connector 22 abuts against the end face of the stainless steel pipe 11 of the first branch pipe component 1. A blocking area 50 is formed at the assembly gap 60 between the outer peripheral wall of the stainless steel extension section 211 and the inner peripheral wall of the stainless steel pipe 11 inside the first branch pipe component to prevent the brazing layer 10 from extending to the end face of the stainless steel extension section 211, thereby effectively avoiding welding blockage.

[0100] like Figure 35As shown, the welding position for non-furnace brazing (such as flame brazing) is located at point K. The brazing filler metal penetrates along the sleeve gap 20 between the two copper pipes 12 and 22 into the end of the second assembly section 222 of the copper pipe 22 inside the second branch pipe component 2, as indicated by the arrow. At this time, the brazing filler metal will enter the assembly gap 60 (i.e., the blocking area 50) between the stainless steel extension section 211 and the inner peripheral wall of the stainless steel pipe 11. In an air environment, a stable and dense oxide film such as Cr2O3 (chromium trioxide) and TiO2 (titanium dioxide) is formed on the surface of the stainless steel extension section 211. During welding, the brazing filler metal has difficulty wetting these oxide films and cannot spread on the surface of the stainless steel extension section 211. The penetration path of the brazing filler metal is blocked at this point and cannot continue to extend to the end face of the stainless steel extension section 211; that is, it will not block the end of the stainless steel extension section 211, which serves as the input end of the second branch pipe component 2.

[0101] Stainless steel is prone to oxidation, and the resulting oxide film has a high melting point and is difficult to remove, making it difficult to braze directly in air. The distributor branch pipe structure provided in this embodiment utilizes this characteristic of stainless steel. By setting a stainless steel extension section 211, a blocking zone 50 is formed to obstruct the penetration path of the brazing filler metal, effectively solving the welding blockage problem easily caused by brazing in air. Simultaneously, the blocking zone 50 ensures that the brazing filler metal can only penetrate into the sleeve gap 20 at any given time, preventing flow even in cases of overheating or secondary welding. A uniform, continuous, and full brazing layer 10 is always formed within the sleeve gap 20, ensuring that the connection strength and sealing performance of the brazing layer 10 meet the requirements of the refrigeration system. Furthermore, the stainless steel extension section 211 extends into the stainless steel pipe 11 of the first branch pipe component 1. This arrangement ensures that the copper pipes 12 and 22 in both branch pipe components are not individually pressurized at any point, giving the distributor branch pipe structure excellent pressure resistance, making it suitable for high-pressure refrigeration systems. Meanwhile, the wall thickness of copper fittings 12 and 22 is not limited by the pressure of the refrigeration system. Their design only needs to meet the requirements of non-furnace brazing (such as flame brazing). Therefore, thinner copper fittings can be selected to further reduce material costs.

[0102] Although this embodiment is described using the example of a stainless steel extension section 211 formed by extending a corresponding copper connector 22 from a stainless steel pipe 21 within a second branch pipe component 2 connected to an external pipeline, this invention does not limit the scope of the invention. In other embodiments, such as... Figure 36As shown, a second assembly section 122 extending from the stainless steel tube 11 within the first branch pipe component 1, which is connected to the liquid separator head body, to form a stainless steel extension section 111 can also be provided. In this structure, the stainless steel extension section 111 is inserted into the second branch pipe component 2, and a blocking area 50 is formed at the assembly gap or partition cavity between the outer peripheral wall of the stainless steel extension section 111 and the inner peripheral wall of the second branch pipe component 2 to prevent the brazing layer 10 from extending to the end face of the stainless steel extension section 111, thereby forming an anti-weld plug and anti-flow welding design. Specifically, the stainless steel extension section 111 extends into the stainless steel tube 21 of the second branch pipe component 2, and the end of the second assembly section 122 of the copper connector in the first branch pipe component 1 abuts against the end of the stainless steel tube 21 in the second branch pipe component 2. The blocking area 50 is the assembly gap 60 between the outer peripheral wall of the stainless steel extension section 111 and the inner peripheral wall of the stainless steel tube 21.

[0103] However, this invention does not impose any limitations on the formation of the blocking area 50. Figures 37 to 40 This is a partial schematic diagram of the branch pipe structure of the liquid separator provided in other embodiments of this utility model.

[0104] like Figure 37 As shown, in this structure, the stainless steel extension 211 inside the second branch pipe component 2 still extends into the stainless steel pipe 11 of the first branch pipe component 1. However, at this time, the end face of the second assembly section 222 of the copper connector 22 corresponding to the stainless steel extension 211 does not abut against the end face of the stainless steel pipe 11 inside the first branch pipe component 1. The blocking area 50 includes the spacer cavity 70 between the outer peripheral wall of the stainless steel extension 211 and the inner peripheral wall of the copper connector 12 inside the first branch pipe component 1, and the assembly gap 60 between the outer peripheral wall of the stainless steel extension 211 and the inner peripheral wall of the stainless steel pipe 11 inside the first branch pipe component 1. Figure 38 The image shown is related to Figure 37 The structure is essentially the same, in which a stainless steel extension is formed within the first branch pipe component 1 connected to the dispensing head body. Specifically, a stainless steel tube 11 within the first branch pipe component 1 extends a corresponding copper connector 12 to form a stainless steel extension 111. The stainless steel extension 111 extends into the stainless steel tube 21 of the second branch pipe component 2. However, the end face of the second assembly section 122 of the copper connector 12 within the first branch pipe component 1 does not abut against the end of the stainless steel tube 21 within the second branch pipe component. Therefore, the blocking area 50 is the spacer 70 between the stainless steel extension 111 and the inner peripheral wall of the copper connector 22 within the second branch pipe component 2, and the assembly gap 60 between the stainless steel extension 111 and the inner peripheral wall of the stainless steel tube 21 within the second branch pipe component 2.

[0105] Figure 39The diagram shows another type of branch pipe structure for the distributor. In this structure, the stainless steel extension 211 inside the second branch pipe component 2 extends into the second assembly section 122 of the copper connector inside the first branch pipe component, and the blocking area 50 is the spacer 70 between the outer peripheral wall of the stainless steel extension 211 and the inner peripheral wall of the copper connector 12 inside the first branch pipe component 1. Figure 40 The image shown is related to Figure 35 With essentially the same structure, the stainless steel extension section 111 is formed within the first branch pipe component 1 connected to the dispensing head body. Specifically, the stainless steel extension section 111 within the first branch pipe component 1 extends into the second assembly section 222 of the copper connector 22 within the second branch pipe component 2, and the blocking area 50 is the spacer cavity 70 between the stainless steel extension section 111 and the inner peripheral wall of the copper connector 22 within the second branch pipe component 2.

[0106] Similar to Embodiment 1, this example also uses flame brazing to form the brazed layer 10 by brazing the two copper connectors 12 and 22. However, this invention does not limit this to any particular method. In other embodiments, induction brazing, arc brazing, laser brazing, or electron beam brazing, or other non-furnace brazing methods in an air environment, can also be used to form the brazed layer.

[0107] Similarly, to avoid performance degradation of the stainless steel pipes due to direct heat radiation from brazing onto their surfaces, the shortest axial distance from the end of the second assembly section with the outer copper fitting to the exposed area of ​​each stainless steel pipe is greater than or equal to Φ, where Φ is the outer diameter of the inner copper fitting. In this embodiment, as... Figure 33 As shown, the end of the second assembly section of the outer copper fitting is the end of the second assembly section 122 of the copper fitting 12 inside the first branch pipe component 1. In both branch pipe components, the copper fittings are also fitted with corresponding stainless steel pipes, and the exposed areas of the stainless steel pipes are the outer peripheral walls of the stainless steel pipes at the ends of the first assembly sections of the corresponding copper fittings. Therefore, as... Figure 33 As shown, the axial spacing L01 is the axial distance from the end of the second assembly section 122 of the copper connector 12 to the end of the first assembly section 121 of the copper connector 12; the axial spacing L02 is the axial distance from the end of the second assembly section 122 of the copper connector 12 to the end of the first assembly section 221 of the copper connector 22 inside the second branch pipe component. Similarly, in structures with similar... Figure 36 In the middle, the outer copper fitting is the copper fitting 22 in the second branch pipe component. The axial spacing L01 is the axial distance from the end of the second assembly section 222 of the copper fitting 22 to the end of the first assembly section 121 of the copper fitting 12; the axial spacing L02 is the axial distance from the end of the second assembly section 222 of the copper fitting 22 to the end of the first assembly section 221 of the inner copper fitting 22 in the second branch pipe component.

[0108] Similar to Embodiment 1, the outer diameters of the stainless steel pipes 11 and 21 in both branch pipe components are greater than or equal to 2 mm and less than or equal to 4.5 mm, and the wall thicknesses are greater than or equal to 0.18 mm and less than or equal to 0.52 mm. However, this invention does not impose any limitations on this. In other embodiments, the stainless steel pipe in one of the branch pipe components may also meet this pipe diameter requirement. Similarly, the stainless steel pipe in each branch pipe component can be either a straight pipe or a bent pipe.

[0109] Similarly, the branch pipe component located away from the distributor head body may also include a copper connecting section welded to the other end of the stainless steel pipe opposite the copper connecting pipe and used for connecting to external pipelines. However, this invention does not limit this in any way. In other embodiments, when the distributor head branch pipe structure is connected to an aluminum heat exchanger, the second branch pipe component may also include an aluminum connecting section.

[0110] Similar to Embodiment 1, the distributor branch pipe structure provided in this embodiment can also be assembled and welded with various stainless steel distributor bodies (or distributor bodies mainly made of stainless steel) to form distributors with various structures, such as... Figures 9 to 22 As shown.

[0111] In summary, the branch pipe structure of the distributor provided by this utility model includes two branch pipe components, each of which includes a stainless steel pipe and a copper connecting pipe. The copper connecting pipes in the two branch pipe components are interlocked to form a homogeneous metal weld based on copper material. Compared with stainless steel, the oxide film on the surface of copper material can be reduced and removed after adding brazing flux. The brazing material can also effectively wet the surface of the copper base material and spread out in an air environment, thereby forming a dense, stable, and high-strength brazing layer. This provides conditions for simple, efficient, and flexible non-furnace brazing of long branch pipe components after stainless steeling. At the same time, by controlling the shortest axial distance from the end of the second assembly section of the outer copper connecting pipe to the exposed area of ​​each stainless steel pipe during welding, the thermal influence of welding heat on the crystal phase structure of the stainless steel pipe during non-furnace brazing is effectively reduced, ensuring that the stainless steel pipe has excellent connection strength and pressure resistance after welding. Furthermore, each copper connecting pipe includes a first assembly section welded to the corresponding stainless steel pipe and a second assembly section that is only interlocked with the other copper connecting pipe. This setup allows the welding heat to be applied only to the second assembly section of the two copper pipes during non-furnace brazing. This not only results in shorter heating time and higher welding efficiency, but more importantly, it significantly reduces the input of welding heat, thereby further reducing the thermal impact of welding heat on the stainless steel pipe during non-furnace brazing.

[0112] In addition, a solder receiving cavity can be set at the end of the sleeve gap between the two copper pipes, an excess solder storage area can be set in the sleeve gap, or a stainless steel extension section can be set on a stainless steel pipe to form a blocking area, etc., to effectively avoid welding blockage caused by excess solder or flow soldering when brazing two copper pipes outside the furnace.

[0113] 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 pipe structure of a liquid separation head, characterized by comprising: The two branch pipe components each include a stainless steel pipe and a copper nipple welded to the end of the stainless steel pipe, and the stainless steel pipe of one of the branch pipe components is welded to the body of the distributor head; Each of the copper nipples includes a first fitting section welded to the corresponding stainless steel pipe and a second fitting section only sleeved with the other copper nipple, a sleeving gap is formed between the two copper nipples, and a brazing layer formed by non-furnace brazing is formed in the sleeving gap; the shortest axial distance from the end of the second fitting section of the sleeved copper nipple to the exposed area of each stainless steel pipe is greater than or equal to Φ, and Φ is the outer diameter of the inserted copper nipple.

2. The manifold structure according to claim 1, wherein At least one of the two copper nipples further includes a soft connection section between the two fitting sections, and the soft connection section is a region of the copper nipple that is not assembled with other pipe fittings.

3. The manifold structure according to claim 2, wherein At least one bend is formed on the soft connection section.

4. The manifold structure according to claim 1, wherein In each of the branch pipe components, the copper nipple is sleeved to the end of the corresponding stainless steel pipe.

5. The head manifold structure according to claim 1, wherein In the extension direction of the brazing layer, a solder accommodating cavity is formed between the two branch pipe components at the end of the sleeving gap and used for accommodating solder.

6. The manifold structure according to claim 1 or 5, wherein The sleeving gap includes an effective depth region of the brazing layer and a surplus solder storage region distributed along the extension direction of the brazing layer; wherein the effective depth L1 of the brazing layer is greater than or equal to 0.4Φ, and Φ is the outer diameter of the inserted copper nipple.

7. The head structure according to claim 1, wherein The outer diameter of the stainless steel pipe in at least one of the branch pipe components is greater than or equal to 2 mm and less than or equal to 4.5 mm, and the wall thickness is greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

8. The head structure according to claim 1, wherein In the two branch pipe components, the branch pipe component away from the body of the distributor head further includes a copper connecting section welded to the other end of the stainless steel pipe opposite to the copper nipple and used for connecting external pipelines.

9. A branch pipe structure of a liquid separation head, characterized by The two branch pipe components each include a stainless steel pipe and a copper nipple welded to the end of the stainless steel pipe, and the stainless steel pipe of one of the branch pipe components is welded to the body of the distributor head; The copper nipples on the two branch pipe components are sleeved with each other, and a brazing layer formed by non-furnace brazing is formed in the sleeving gap; the stainless steel pipe in one of the branch pipe components extends out of the corresponding copper nipple to form a stainless steel extension section, the stainless steel extension section extends into the other branch pipe component, and a blocking region is formed at the assembly gap or spacing cavity between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the other branch pipe component to block the brazing layer from extending to the end face of the stainless steel extension section.

10. The head structure according to claim 9, wherein The stainless steel extension section extends into the stainless steel pipe of the other branch pipe component, and the end face of the corresponding copper nipple of the stainless steel extension section abuts against the end face of the stainless steel pipe in the other branch pipe component, and the blocking region is an assembly gap between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the stainless steel pipe in the other branch pipe component.

11. The manifold structure according to claim 9, wherein The stainless steel extension section extends into the stainless steel pipe of the other branch pipe component, and the end face of the corresponding copper nipple of the stainless steel extension section does not abut against the end face of the stainless steel pipe in the other branch pipe component, and the blocking region includes a spacing cavity between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the copper nipple in the other branch pipe component and an assembly gap between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the stainless steel pipe in the other branch pipe component.

12. The manifold structure according to claim 9, wherein The stainless steel extension section extends into a copper nipple of another branch member, and the blocking area is a spacing cavity between the outer peripheral wall of the stainless steel extension section and the inner peripheral wall of the copper nipple in the other branch member.

13. The head manifold structure according to claim 9, wherein Each copper nipple comprises a first fitting section and a second fitting section, and the second fitting sections of the two copper nipples are sleeved with each other; the shortest axial distance from the end of the second fitting section of the outer sleeve copper nipple to the exposed area of each stainless steel pipe is greater than or equal to Φ, and Φ is the outer diameter of the inner insertion copper nipple.

14. The liquid distribution head manifold structure according to claim 13, wherein The copper nipple in each branch member is sleeved on the end of the corresponding stainless steel pipe.

15. The head manifold structure according to Claim 9, wherein The outer diameter of the stainless steel pipe in at least one branch member is greater than or equal to 2 mm and less than or equal to 4.5 mm, and the wall thickness is greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

16. The manifold structure according to claim 9, wherein In the two branch members, the branch member away from the body of the distribution head further comprises a copper connecting section opposite to the copper nipple and welded to the other end of the stainless steel pipe and used for connecting external pipelines.

17. A liquid separator head, characterized by The distribution head branch structure comprises a plurality of distribution head branch structures according to any one of claims 1 or 9.

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