Refrigerant distributor, heat exchanger assembly, and refrigeration system

Abstract

The utility model provides a kind of refrigerant distributor, heat exchanger assembly and refrigeration system, and refrigerant distributor includes distributor body and multiple pipes. The outflow end of distributor body is provided with multiple connection hole. Multiple pipes are respectively welded and connected in multiple connection hole of distributor body, and each pipe includes welded and connected pipe body and connecting piece, and connecting piece includes first connecting section and second connecting section away from distributor body and inner diameter greater than the outer diameter of pipe body. Wherein, pipe body is inserted in connecting piece and its end is substantially extended to or over the end of second connecting section to form refrigerant output end, and annular cavity is formed between pipe body and second connecting section to match the pipe diameter of second connecting section welding external pipeline.

Description

[0001] This application claims application number 2025211183974, application date: May 30, 2025, and the patent title is: refrigerant distributor, heat exchanger assembly and refrigeration system. Technical Field

[0002] This utility model relates to a refrigeration accessory, and more particularly to a refrigerant distributor, a heat exchanger assembly, and a refrigeration system. Background Technology

[0003] With the development of small-diameter pipe technology, heat exchanger assemblies in refrigeration systems typically employ multi-flow-path designs to reduce refrigerant pressure drop and improve heat exchange performance. To ensure that the throttled two-phase refrigerant is evenly and uniformly distributed into each flow path of the heat exchanger assembly, a distributor needs to be introduced before the heat exchanger assembly. To achieve welding between the distributor and each flow path of the heat exchanger assembly, the diameter of the distributor piping needs to be set relatively large to match the pipe diameters of each flow path within the heat exchanger assembly. However, increasing the piping inner diameter can cause excessive refrigerant expansion, leading to partial vaporization of the liquid refrigerant before it can fully enter the heat exchanger assembly. This premature vaporization of the liquid refrigerant directly affects the cooling capacity of the heat exchanger assembly and also impacts the uniformity of refrigerant distribution. Furthermore, increasing the piping inner diameter also reduces the refrigerant velocity, affecting the heat transfer temperature difference and irreversible losses of the heat exchanger assembly, while also exacerbating gas-liquid phase separation and worsening the flow distribution performance. Furthermore, for stainless steel pipes with high material hardness, increasing the pipe diameter will drastically reduce their forming and processing capabilities, making it difficult to bend and assemble them at the customer's site.

[0004] In view of this, the inventors proposed a distributor body and air conditioner in Chinese Patent CN118882247A. In this solution, the end of the branch pipe forms an assembly straight section that connects to the external heat exchanger assembly. By setting an inner liner in the assembly straight section to reduce the inner diameter at that point, the expansion degree of the refrigerant at that point is reduced. However, in practical applications, to meet the installation space and cooling capacity requirements of different refrigeration products, the branch pipe upstream of the assembly straight section also has various specifications. In the solution provided by Chinese Patent CN118882247A, the wall thickness of the inner liner needs to be customized according to the specifications of the branch pipe upstream of the assembly straight section. This leads to a large number of inner liner specifications during processing, which puts great pressure on production management, costs, and inventory. In addition, these specifications of inner liners are usually non-standard circular pipe fittings, which are not only difficult to procure but also have high procurement costs. The method of forming the inner liner by bending and rolling the liner has problems such as many processing steps, the processing difficulty of the liner increases sharply with the increase of its wall thickness, and poor consistency after processing. Utility Model Content

[0005] In order to overcome at least one deficiency of the prior art, this utility model provides a refrigerant distributor, a heat exchanger assembly, and a refrigeration system.

[0006] To achieve the above objectives, this utility model provides a refrigerant distributor, which includes a distributor body and multiple pipes. The distributor body has multiple connecting holes at its outlet end. The multiple pipes are welded to the multiple connecting holes of the distributor body, and each pipe includes a welded pipe body and a connector. The connector includes a first connecting section and a second connecting section that is farther from the distributor body and has an inner diameter larger than the outer diameter of the pipe body.

[0007] The piping body is inserted into the connector and its end extends substantially to or beyond the end of the second connecting section to form a refrigerant output end. An annular cavity is formed between the piping body and the second connecting section so that the diameter of the second connecting section matches the external pipeline welding.

[0008] According to one embodiment of the present invention, the end of the piping body is formed with a blocking member that blocks the annular cavity to prevent refrigerant from entering the annular cavity.

[0009] According to one embodiment of the present invention, the end peripheral wall of the pipe body is bent outward in a radial direction and the extended end substantially abuts against the second connecting section to form a blocking member.

[0010] Alternatively, the end peripheral wall of the second connecting section is bent inward along the radial direction and the extended end substantially abuts against the piping body to form a blocking element.

[0011] According to one embodiment of the present invention, the blocking member is one or more sequentially stacked annular shielding plates embedded in the annular cavity, and the annular shielding plates are welded to the second connecting section and / or the end of the piping body.

[0012] According to one embodiment of the present invention, the piping body is brazed to the first connecting section, and the annular cavity near the first connecting section forms a solder receiving area to accommodate excess brazing solder during welding.

[0013] According to one embodiment of the present invention, the axial length L of the second connecting segment satisfies 7mm≤L≤80mm, and the axial length of the second connecting segment refers to the axial distance from the connection point of the first connecting segment and the second connecting segment to the end of the second connecting segment.

[0014] According to one embodiment of the present invention, the piping body is one or more combinations of stainless steel pipe, copper pipe, and aluminum pipe.

[0015] According to one embodiment of the present invention, the piping body includes a stainless steel pipe section, the outer diameter of which is greater than or equal to 2 mm and less than or equal to 4.5 mm, and its wall thickness is greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

[0016] According to one embodiment of the present utility model, the connector is a circular pipe fitting, and the upstream end of the circular pipe fitting is narrowed to form a first connecting section whose inner diameter matches the outer diameter of the pipe body.

[0017] Alternatively, the connector includes a circular tube and an inner liner fitted inside the upstream end of the circular tube, the inner diameter of which matches the outer diameter of the pipe body, and the location of the inner liner forms the first connecting section.

[0018] According to one embodiment of the present invention, the connector is a tension member, the upstream end of the tension member has a flange hole for welding and connecting the pipe body, the flange hole forms a first connecting section, and the downstream end of the tension member is open to form a second connecting section.

[0019] On the other hand, this utility model also provides another refrigerant distributor, which includes a distributor body and multiple pipes. The outlet end of the distributor body has multiple connecting holes. The multiple pipes are welded to the multiple connecting holes of the distributor body, and each pipe includes a pipe body and a connector welded together. The connector includes a first connecting section and a second connecting section that is far from the distributor body and has an inner diameter larger than the outer diameter of the pipe body.

[0020] The piping body is inserted into the connector and its end extends into the second connecting section. An annular cavity is formed between the piping body and the second connecting section so that the pipe diameter of the second connecting section matches the external pipeline welding. The end of the second connecting section forms a refrigerant output end, and the maximum inner diameter Dmax of the transmission section used to transmit refrigerant in the second connecting section is less than or equal to 6.5mm. The transmission section refers to the area of ​​the second connecting section located downstream of the end of the piping body.

[0021] According to one embodiment of the present invention, the piping body is brazed to the first connecting section, and the annular cavity near the first connecting section forms a solder receiving area to accommodate excess brazing solder during welding.

[0022] According to one embodiment of the present invention, the piping body is one or more combinations of stainless steel pipe, copper pipe, and aluminum pipe.

[0023] According to one embodiment of the present invention, the piping body includes a stainless steel pipe section, the outer diameter of which is greater than or equal to 2 mm and less than or equal to 4.5 mm, and its wall thickness is greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

[0024] According to one embodiment of the present utility model, the connector is a circular pipe fitting, and the upstream end of the circular pipe fitting is narrowed to form a first connecting section whose inner diameter matches the outer diameter of the pipe body.

[0025] Alternatively, the connector includes a circular tube and an inner liner fitted inside the upstream end of the circular tube, the inner diameter of which matches the outer diameter of the pipe body, and the location of the inner liner forms the first connecting section.

[0026] Alternatively, the connector is a tension member, with a flanged hole formed at the upstream end of the tension member for welding connection to the piping body, forming a first connecting section at the location of the flanged hole, and the downstream end of the tension member being open to form a second connecting section.

[0027] On the other hand, this utility model also provides another refrigerant distributor, which includes a distributor body and multiple pipes. The outlet end of the distributor body has multiple connecting holes. The multiple pipes are welded to the multiple connecting holes of the distributor body, and each pipe includes a pipe body and a connector welded together. The connector includes a first connecting section and a second connecting section that is far from the distributor body and has an inner diameter larger than the outer diameter of the pipe body.

[0028] The end of the piping body is welded to the first connecting section and does not extend to the second connecting section. The second connecting section is welded to the external pipeline and forms a refrigerant output end. The inner diameter of the piping body is less than or equal to 4.14 mm, and the maximum inner diameter Dmax of the second connecting section is less than or equal to 6.5 mm.

[0029] According to one embodiment of the present invention, the piping body includes a stainless steel pipe section, the outer diameter of which is greater than or equal to 2 mm and less than or equal to 4.5 mm, and its wall thickness is greater than or equal to 0.18 mm and less than or equal to 0.52 mm.

[0030] According to one embodiment of the present invention, the piping body is one or more combinations of stainless steel pipe, copper pipe, and aluminum pipe.

[0031] According to one embodiment of the present utility model, the connector is a circular pipe fitting, and the upstream end of the circular pipe fitting is narrowed to form a first connecting section whose inner diameter matches the outer diameter of the pipe body.

[0032] Alternatively, the connector includes a circular tube and an inner liner fitted inside the upstream end of the circular tube, the inner diameter of which matches the outer diameter of the pipe body, and the location of the inner liner forms the first connecting section.

[0033] Alternatively, the connector is a tension member, with a flanged hole formed at the upstream end of the tension member for welding connection to the piping body, forming a first connecting section at the location of the flanged hole, and the downstream end of the tension member being open to form a second connecting section.

[0034] On the other hand, the present invention also provides a heat exchanger assembly, which includes the aforementioned refrigerant distributor.

[0035] On the other hand, the present invention also provides a refrigeration system, which includes the above-mentioned heat exchanger assembly.

[0036] In summary, the refrigerant distributor provided by this invention forms a refrigerant output end by inserting a smaller-diameter piping body into a connector, with its end extending substantially to or beyond the end of the second connecting section of the connector. Simultaneously, an annular cavity is formed between the piping body and the second connecting section to allow the diameter of the second connecting section to match the external pipeline welding. This arrangement ensures that the refrigerant is only transported within the smaller-diameter piping body, and the connection of the external pipeline is only related to the larger-diameter second connecting section. The refrigerant transport channel and the external pipeline connection section are independent of each other. Therefore, the design of the piping body only needs to meet the refrigerant transport performance requirements of the downstream heat exchanger assembly, and the design of the second connecting section only needs to meet the welding assembly requirements. The two no longer constrain each other, thus enabling the refrigerant distributor provided by this invention to simultaneously meet the requirements of refrigerant distribution performance and welding assembly.

[0037] Furthermore, in the refrigerant distributor provided by this utility model, the molding method of the annular cavity and the first connection also allows pipe bodies of different specifications to share the same connector blank, effectively solving the problems of production management, production cost and inventory pressure caused by the customization of the inner liner according to the specifications of the branch pipe in the existing distributor.

[0038] 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

[0039] Figure 1 The diagram shown is a structural schematic of the refrigerant distributor provided in Embodiment 1 of this utility model.

[0040] Figure 2 As shown Figure 1 Enlarged diagram of point A in the middle.

[0041] Figures 3 to 5 The diagram shown is a structural schematic of the piping in a refrigerant distributor according to another embodiment of the present invention.

[0042] Figure 6A , Figure 6B as well as Figure 6C The diagram shown is a structural schematic of the piping in a refrigerant distributor according to another embodiment of the present invention.

[0043] Figure 7 and Figure 8 This is a schematic diagram of the piping structure in a refrigerant distributor provided in another embodiment of the present invention.

[0044] Figure 9 The diagram shown is a structural schematic of a refrigerant distributor provided in another embodiment of this utility model.

[0045] Figures 10 to 22The diagram shown is a structural schematic of a refrigerant distributor provided in another embodiment of this utility model.

[0046] Figure 23 The diagram shown is a schematic diagram of the piping structure in the refrigerant distributor provided in Embodiment 2 of this utility model.

[0047] Figure 24 This is a schematic diagram of the piping structure in a refrigerant distributor provided in another embodiment of the present invention.

[0048] Figure 25 The diagram shown is a schematic diagram of the piping structure in the refrigerant distributor provided in Embodiment 3 of this utility model.

[0049] Figure 26 The diagram shown is a schematic diagram of the piping structure in the refrigerant distributor provided in Embodiment 4 of this utility model.

[0050] Figure 27 The diagram shown is a schematic diagram of the piping structure in the refrigerant distributor provided in Embodiment 5 of this utility model.

[0051] Figure 28 This is a schematic diagram of the piping structure in a refrigerant distributor provided in another embodiment of the present invention. Detailed Implementation

[0052] In this application, the distinction between upstream and downstream is based on the direction of refrigerant flow. Generally, refrigerant flows from upstream to downstream, and the downstream area receives refrigerant from upstream. In a refrigeration system, distributors are typically installed vertically or at an angle, with the inlet end of the distributor located below the outlet end along the direction of gravity. The inertial force of the refrigerant within the distributor overcomes gravity and flows in the opposite direction. In this case, the upstream and downstream distinction is still based on the direction of refrigerant flow.

[0053] In this application, the distributor body refers to the body structure used for mixing and distributing gas-liquid two-phase refrigerant, and the shape of the body structure is close to cylindrical.

[0054] Example 1

[0055] In existing refrigerant distributors, the end of each branch pipe serves as both the refrigerant outlet and the assembly end for connection to external piping. To achieve proper welding with external piping, the branch pipe diameter needs to be relatively large. However, an excessively large branch pipe diameter causes excessive refrigerant expansion, which not only worsens the uniformity of refrigerant distribution but also severely impacts heat exchanger performance. While the inventor's proposed solution of adding an inner liner to the end of the branch pipe can effectively suppress refrigerant expansion within the branch pipe, this solution suffers from problems such as difficulty in procuring customized non-standard inner liners, high procurement costs (or complex and difficult processing), and the large number of custom inner liner specifications based on the branch pipe dimensions poses a significant challenge to production management.

[0056] In view of this, this embodiment provides a refrigerant distributor whose refrigerant output channel and piping connections are independent of each other. For example... Figure 1 and Figure 2 As shown, the refrigerant distributor provided in this embodiment includes a distributor body 1 and multiple pipes 2. The distributor body 1 has multiple inlet ports 11 at its outlet end. The multiple pipes 2 are welded to the multiple inlet ports 11 of the distributor body 1. Each pipe 2 includes a welded pipe body 21 and a connector 22. The connector 22 includes a first connecting section 221 and a second connecting section 222, which is located away from the distributor body 1 and has an inner diameter larger than the outer diameter of the pipe body 21. The pipe body 21 is inserted into the connector 22, and its end extends substantially to or beyond the end of the second connecting section 222 to form a refrigerant outlet. An annular cavity 100 is formed between the pipe body 21 and the second connecting section 222 so that the outer diameter of the second connecting section 222 matches the welded external piping.

[0057] In the refrigerant distributor provided in this embodiment, the piping body 21 is inserted into the connector 22, and its end extends to or beyond the end of the second connecting section 222 of the connector to form a refrigerant output end. This arrangement ensures that the refrigerant flows only within the piping body 21, and the flow state and gas-liquid two-phase change state of the refrigerant are only related to the inner diameter of the piping body 21, and are independent of the second connecting section 222 on the connector 22 used for welding connection with external pipelines. Therefore, when designing the piping body 21, only the performance parameters of the downstream heat exchanger assembly for the input refrigerant (including parameters such as refrigerant velocity, flow rate, and dryness) need to be considered, without having to take into account welding assembly issues. Furthermore, the annular cavity 100 formed between the second connecting section 222 and the piping body 21 means that the design of the second connecting section 222 on the connector 22 does not need to consider the refrigerant transmission performance, nor is it limited by the specifications of the piping body 21; that is, its design only needs to consider the factor of external pipeline assembly. Specifically, based on the defined piping body 21, the inner or outer diameter of the second connecting section 200 can be adjusted by adjusting the radial clearance of the annular cavity 100 to meet the welding requirements of the external pipeline, such as matching the welding requirements of the inlet end of the downstream heat exchanger assembly.

[0058] In the refrigerant distributor provided in this embodiment, the piping 2 achieves independence in both the refrigerant transmission channel and the pipe connection assembly, thus effectively balancing the welding assembly requirements and the refrigerant performance parameter requirements of the downstream heat exchanger components. Simultaneously, the independent design of the piping body 21 and the second connecting section 222 significantly reduces the processing difficulty of the piping 2. Furthermore, the annular cavity 100 allows piping bodies 21 of different specifications to use the same second connecting section 222. Based on this condition, when assembling the connector 22 and the piping body 21, simple necking, punching and flanging processes or the addition of an inner liner can be used to form a first connecting section 221 at the upstream end of the connector 22 that matches the outer diameter of the piping body (the specific connection method will be explained in detail later). This achieves universality of the connector blank, effectively solving the production management, production cost, and inventory problems caused by the customization of the inner liner according to the branch pipe specifications in existing distributors.

[0059] In this embodiment, a blocking member 23 is formed at the end of the piping body 21 to block the annular cavity 100 and prevent refrigerant from entering the annular cavity 100. The blocking member 23 prevents refrigerant output from the end of the piping body 21 from flowing back into the annular cavity 100, thus avoiding vibration and noise. It also effectively prevents the refrigerant from expanding again within the annular cavity 100. The refrigerant output from the end of the piping body 21 quickly enters the downstream heat exchanger assembly, greatly improving heat exchange efficiency. Figure 2 As shown, in this embodiment, the peripheral wall of the end of the pipe body 21 is bent outward in a radial direction, and the extended end substantially abuts against the second connecting section 222 to form a blocking member 23; that is, the blocking member 23 is integrally formed with the pipe body 21. Specifically, the blocking member 23 is an inclined flared portion located at the end of the pipe body 21. However, this utility model does not limit this in any way. In other embodiments, when the end of the pipe body 21 is substantially flush with the end of the second connecting section 222, the blocking member 23 can also be an annular surface substantially perpendicular to the axis of the second connecting section 222, such as... Figure 3 As shown.

[0060] Although this embodiment is described with the blocking part 23 integrally formed into the pipe body 21 as an example, the present invention does not limit this in any way. In other embodiments, such as Figure 4 As shown, the end peripheral wall of the second connecting section 222 can also be bent radially inward and extended through a necking process, with the extended end substantially abutting against the pipe body 21 to form a blocking member 23. Alternatively, in other embodiments, the blocking member 23 is provided as an annular baffle embedded in the annular cavity 100, and the annular baffle is welded to the end of the second connecting section 222 and / or the pipe body 21. Figure 5In this embodiment, the number of annular blocking plates is one. However, this invention does not limit this. In other embodiments, the annular blocking plates may also be multiple plates, which are stacked and welded together to form the blocking component. Specifically, the annular blocking plates can be formed by stamping sheet metal.

[0061] Furthermore, in other embodiments, the end of the piping body 21 may not require a blocking element, such as... Figure 6A , Figure 6B as well as Figure 6C As shown. Although Figure 1 and Figure 2 The description takes the example of the piping body 21 extending substantially to the end of the second connecting section 222. However, this invention does not limit the scope of the invention in any way. In other embodiments, such as... Figure 6A As shown, the end of the piping body 21 can also extend past the end of the second connecting section 222 and directly into the external piping; or, as... Figure 6B As shown, the end of the piping body 21 is flush with the end of the second connecting section 222; or, as... Figure 6C The end of the piping body 21 shown is slightly recessed within the second connecting section 222.

[0062] In this embodiment, the connector 22 is a circular pipe. The upstream end of the circular pipe is narrowed to form a first connecting section 221 with an inner diameter matching the outer diameter of the pipe body 21. The first connecting section 221 is welded to the outer peripheral wall of the pipe body 21. In this embodiment, the blocking member 23 at the end of the pipe body 21 and the second connecting section 222 are not welded together; that is, the end of the blocking member 23 only abuts against the peripheral wall of the second connecting section 222. However, this invention does not limit this aspect. In other embodiments, such as... Figure 7 As shown, a straight connecting section 211 downstream of the blocking member 23 can also be formed at the end of the piping body 21. The straight connecting section 211 is welded to the second connecting section 222 to achieve a welded connection between the piping body 21 and the connecting member 22. In this structure, the piping body 21 can be welded to the first connecting section 221 to further increase the welding strength, or it can be left unwelded to the first connecting section 221.

[0063] In this embodiment, the outer peripheral wall of the piping body 21 is brazed to the first connecting section 221. Specifically, depending on the materials of the piping body 21 and the first connecting section 221, any one of the following brazing methods can be used: tunnel furnace brazing, flame brazing, high-frequency brazing, or laser brazing. In this embodiment, a solder receiving area 101 is also formed in the annular cavity 100 near the first connecting section 211 to accommodate excess solder during brazing. Figure 2As shown, after the first connecting section 221 is formed by the necking process, the second connecting section 222 includes an inclined transition section 2221 and an assembly straight section 2222. The annular cavity 100 where the inclined transition section 2221 is located forms the solder receiving area 101.

[0064] Specifically, taking the brazing filler metal fed from the end of the first connecting section 221 as an example, during welding, the molten brazing filler metal, under capillary action, gradually penetrates from the end of the first connecting section 221 into the assembly gap between the outer peripheral wall of the pipe body 21 and the first connecting section 221, and gradually fills the assembly gap. Under the action of inertial force, excess brazing filler metal will penetrate into the solder receiving area 101. Furthermore, since the solder receiving area 101 formed by the inclined transition section 2221 is a space with a gradually increasing radial gap, at the upstream end of the solder receiving area 101, the gap between the pipe body 21 and the inclined transition section 2221 is still very small and has a certain capillary effect. The capillary effect and inertial force together store excess solder in the solder receiving area 101. Subsequently, the inertial force of penetration gradually disappears, and the capillary effect also gradually weakens as the radial gap of the solder receiving area 101 increases. The brazing material stagnates and is stored within the solder receiving area 101, without continuing to penetrate downstream and block the end of the piping body 21. Similarly, when the brazing material is placed in the form of a solder ring at the upstream end of the solder receiving area 101, the molten brazing material gradually penetrates under capillary action into the assembly gap between the outer peripheral wall of the piping body 21 and the first connecting section 221, reaching the end of the first connecting section 221. At this time, excess brazing material will also only be stored within the solder receiving area 101 and will not continue to penetrate downstream of the annular cavity 100 and block the end of the piping body 21.

[0065] The refrigerant distributor provided in this embodiment utilizes a solder receiving area 101 formed in the annular cavity 100 near the first connecting section 221 to store excess solder during brazing. This ensures that the solder fully fills the assembly gap between the outer peripheral wall of the piping body 21 and the first connecting section 221 while avoiding welding blockage. Although this embodiment uses a solder receiving area 101 with gradually increasing radial gap as an example, this invention does not limit it in any way. In other embodiments, when the first connecting section 221 and the second connecting section 222 are connected by a step formed by the difference in inner diameter, the annular cavity 100 still forms a solder receiving area 101 at the step to store excess solder overflowing due to penetration inertial force, such as... Figure 8 As shown.

[0066] In this embodiment, the axial length L of the second connecting segment 222 satisfies 7mm ≤ L ≤ 80mm. The axial length of the second connecting segment 222 refers to the axial distance from the connection point of the first connecting segment 221 and the second connecting segment 222 to the end of the second connecting segment 222. Specifically, in this embodiment, the axial length L of the second connecting segment 222 refers to the axial distance from the upstream end of the inclined transition segment 2221 to the end of the second connecting segment 222. Preferably, the axial length L of the second connecting segment 222 is set to 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, or other values ​​within the range of 7mm to 80mm.

[0067] In this embodiment, the piping body 21 includes a stainless steel pipe section. Preferably, the outer diameter of the stainless steel pipe section is greater than or equal to 2 mm and less than or equal to 4.5 mm, and its wall thickness is 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 refrigerant, due to its small flow cross-sectional area, can suppress refrigerant expansion and maintain a high flow velocity. The refrigerant, after thorough mixing of the gas and liquid phases in the distributor body 1, can be quickly and evenly distributed to each piping 2. At the same time, the high-speed flow of the refrigerant can also reduce irreversible heat transfer losses and improve heat exchanger performance. Furthermore, the smaller pipe diameter and wall thickness also give the piping body 21 excellent forming and processing capabilities. When the refrigerant distributor is assembled into the refrigeration system piping, the end of the second connecting section 222 can be bent to face the system piping to which it is assembled. Preferably, the outer diameter and wall thickness of the piping body 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 utility model does not impose any limitations on this.

[0068] In this embodiment, the piping body 21 includes a connecting section 21A welded to the connecting hole 11 and an extension section 21B located downstream of the connecting section 21A. The connecting section 21A and the extension section 21B are two separate pipe sections welded together. The inner diameter of the connecting section 21A is larger than that of the extension section 21B, allowing the refrigerant to be better distributed into the piping 2. However, this utility model does not impose any limitations on this. In other embodiments, the connecting section 21A and the extension section 21B can be integrally formed, such as... Figure 9 As shown. In other embodiments, the piping body may also be a pipe with a substantially uniform inner diameter and wall thickness.

[0069] Although this embodiment uses a stainless steel pipe as the piping body 21 as an example, the present invention does not limit this in any way. In other embodiments, the piping body may also be one or more combinations of stainless steel pipe, copper pipe, and aluminum pipe.

[0070] like Figure 1As shown, the dispenser body 1 provided in this embodiment has a structure that integrates reflection and mixing. A partition 4 is provided inside the dispenser body 1. 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 towards the side where the inlet pipe hole 11 is located. The partition 4 divides the inner cavity of the dispenser body into a reflection mixing area 1031 near the inlet end and including the cavity 401, and a mixing and distributing area 1032 near the outlet end. Multiple partition holes 41 are formed on the partition 4 in a ring around the axis of the dispenser body 1, connecting the reflection mixing area 1031 and the mixing and distributing area 1032. The multiple partition holes 41 are configured to correspond one-to-one with the multiple inlet pipe holes 11, and when projected along the axial direction of the dispenser body 1, the multiple 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 dispenser body. The piping structure provided in this embodiment is also applicable to dispenser bodies with other structures, such as... Figures 10 to 22 As shown.

[0071] exist Figure 10 The distributor body 1 contains a two-stage jet reflection and mixing component 5. The two-stage jet reflection and mixing component 5 includes a primary reflection mixing plate 51, a secondary jet orifice plate 52, and a secondary reflection mixing plate 53, which are sequentially spaced along the refrigerant flow direction within the distributor body 1. The primary reflection mixing plate 51 is positioned opposite the inlet pipe 3 to reflect and mix the refrigerant jetted in by 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, collects in the jet cavity 502 through the flow hole 511 and is then jetted to the secondary reflection mixing plate 53 through the secondary jet orifice 521. The secondary reflective mixing plate 53 is distributed opposite to the secondary jet holes 521 and has multiple guide holes 531, the same number as the connecting pipe holes 11. Each guide hole 531 is substantially coaxial with the corresponding connecting pipe hole 11. 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 11 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.

[0072] Figure 11 and Figure 10 The structures are basically the same, the difference is: Figure 11The distributor body 1 shown also includes a chamber partition plate 54 located downstream of the primary reflective mixing plate 51. The chamber partition plate 54 divides the jet cavity 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 connects to the secondary jet hole 521. The chamber partition plate 54 has partition plate through holes that are staggered with the multiple flow holes 511 (due to the viewing angle). Figure 11 (Not shown in the image).

[0073] exist Figure 12 In the distributor body 1, a flat baffle 4' and a conical flow channel forming element 6 are formed inside; a plurality of baffle holes 41 are formed on the flat baffle 4'.

[0074] 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 partition 4' is formed inside the distributor body 1. Figure 15 In this structure, only the flow channel forming element 6 is formed inside the distributor body 1; 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.

[0075] Figure 16 The main body of the middle distributor 1 is a plug-in type structure; Figure 17 The main body of the middle distributor 1 is a Venturi structure; Figure 18 The main body of the middle distributor 1 is a Venturi tube structure; Figure 19 The main body of the middle distributor 1 is a reflective structure; Figure 20 The main body of the middle distributor 1 is an impeller-type structure; Figure 21 The main body of the middle distributor 1 has a conical structure. Figure 22 The distributor body 1 is an orifice plate structure. The specific structure of the distributor body will not be listed exhaustively here; other distributor body structures that can improve liquid distribution uniformity can be combined with the piping provided in this embodiment to form a high-performance distributor body with high liquid distribution uniformity and low heat exchange loss. Similarly, the structure of the inlet pipe 3 is not limited in any way here; 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.

[0076] On the other hand, this embodiment also provides a heat exchanger assembly including the aforementioned distributor body. Specifically, the heat exchanger assembly may be an evaporator or a condenser.

[0077] On the other hand, this embodiment also provides a refrigeration system for the above-mentioned heat exchanger assembly. Specifically, the refrigeration system may be an air conditioning system, a refrigeration system, or a cold storage system.

[0078] Example 2

[0079] This embodiment is basically the same as Embodiment 1 and its variations, except that the structure of the connector 2 is different.

[0080] In this embodiment, as Figure 23 As shown, the connector 22 includes a circular pipe body 22A and an inner liner 22B fitted inside the upstream end of the circular pipe body 22A. The inner diameter of the inner liner 22B matches the outer diameter of the piping body 21, and the location of the inner liner 22B forms a first connecting section 221. In this embodiment, the circular pipe body 22A is a pipe with an inner diameter and wall thickness that are basically the same, that is, the inner diameter of the circular pipe body 22A on the first connecting section 221 is basically equal to the inner diameter of the circular pipe body 22A at the second connecting section 222.

[0081] This embodiment adds an inner liner 22B to form a first connecting section 221 for welding connection to the piping body 21 at the upstream end of the circular pipe 22A. Specifically, the inner liner 22B is a stamped inner ring or multiple inner rings coaxially stacked. The stamped inner ring is not only easy and efficient to process, but also allows for adjustment of the radial width (i.e., the difference between the outer and inner diameters of the inner ring) by adjusting the stamping distance twice, thus meeting different gap requirements between the piping body 21 and the circular pipe 22A. Compared to the inner liner sleeves customized based on non-standard circular pipes in existing distributors, the inner ring can be processed using a simple stamping process, eliminating the need for external procurement. The simple and efficient processing method also eliminates the need for pre-stocking the inner ring; it can be processed according to the order quantity before assembly, effectively solving the problems of production management, cost, and inventory backlog associated with customized parts. Although... Figure 23 The number of inner liner rings is one. However, this invention does not limit this in any way. In other embodiments, such as Figure 24 As shown, multiple inner lining rings can also be stacked and welded in sequence to form inner lining component 22B.

[0082] Furthermore, in other embodiments, the inner liner can also be a standard part with a fixed wall thickness. During assembly, the upstream end of the circular tube is narrowed to form a first connecting section where the inner liner is located. This structure adjusts the change in tube diameter when the upstream end of the circular tube is narrowed to make the inner liner a standard part. In this case, the inner liner can be an inner ring formed by stamping in this embodiment, or an inner sleeve formed after cutting a standard circular tube.

[0083] Example 3

[0084] This embodiment is basically the same as Embodiment 1 and its variations, except that the structure of the connector 2 is different.

[0085] In this embodiment, as Figure 25 As shown, connector 2 is a tension member. A flange hole is formed at the upstream end of the tension member to weld and connect the piping body 21. A first connecting section 221 is formed at the location of the flange hole. The downstream end of the tension member is open to form a second connecting section 222.

[0086] Similar to Embodiment 1, the piping body 21 is inserted into the connector 22 through the flange hole and its end extends substantially to or beyond the end of the second connecting section 222 to form a refrigerant output end. An annular cavity 100 is formed between the piping body 21 and the second connecting section 222 so that the pipe diameter of the second connecting section 222 matches the external pipeline welding. The outer peripheral wall of the piping body 21 is welded to the first connecting section 221 formed at the flange hole.

[0087] In this embodiment, the end face of the connector 22 at the location of the flanged hole (first connecting segment 221) is substantially close to a plane. However, this utility model does not impose any limitation on this. In other embodiments, the end face of the connector 22 at the location of the flanged hole (first connecting segment 221) may also be an arc surface or an inclined surface.

[0088] The materials, structures, and dimensions of the piping body 21, the structure of the annular cavity 100, and the specific structures of the solder receiving area 101 are basically the same as those in Embodiment 1 and their variations. Further details will not be provided here.

[0089] Example 4

[0090] The refrigerant distributor provided in Embodiment 1 extends the piping body 21 to the end of the second connecting section 222 on the connector 22, so that the refrigerant transmission state is almost unaffected by the diameter of the second connecting section 222. The diameter of the second connecting section 222 only needs to meet the requirements for external pipe welding. Based on the same idea, this embodiment provides a distributor that inserts the piping body 21 into the connector 22 to shorten the refrigerant expansion path, and controls the inner diameter of the second connecting section 222 to suppress the degree of refrigerant expansion.

[0091] Specifically, such as Figure 26As shown, the refrigerant distributor provided in this embodiment includes a distributor body 1 and multiple pipes 2. Each pipe 2 includes a pipe body 21 and a connector 22 welded together. The connector 22 includes a first connecting section 221 and a second connecting section 222 located away from the distributor body 1 and having an inner diameter larger than the outer diameter of the pipe body 21. The pipe body 21 is inserted into the connector 22, and its end extends into the second connecting section 222. An annular cavity 100 is formed between the pipe body 21 and the second connecting section 222 so that the pipe diameter of the second connecting section 222 matches the external pipe welding. The end of the second connecting section 222 forms a refrigerant output end, and the maximum inner diameter Dmax of the transmission section within the second connecting section 222 used for refrigerant transmission is less than or equal to 6.5 mm. The transmission section refers to the area of ​​the second connecting section located downstream of the end of the pipe body 21.

[0092] In the refrigerant distributor provided in this embodiment, since the end of the piping body 21 does not extend to the end of the second connecting section 222, the second connecting section 222 serves as the refrigerant output end while matching the external pipeline welding. At this time, the refrigerant will inevitably expand at the second connecting section 222, but the extension of the piping body 21 effectively shortens the refrigerant's transmission path within the connector 22. Simultaneously, controlling the maximum inner diameter Dmax of the transmission section within the second connecting section 222 effectively curbs the degree of refrigerant expansion, thereby achieving a comprehensive balance between external pipeline welding and refrigerant transmission parameters.

[0093] Specifically, the piping body 21 includes stainless steel pipe sections. Preferably, the outer diameter of the stainless steel pipe sections is greater than or equal to 2 mm and less than or equal to 4.5 mm, and its wall thickness is 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 refrigerant, due to its small flow cross-sectional area, can suppress refrigerant expansion and maintain a high flow velocity. The refrigerant, after thorough mixing of the gas and liquid phases within the distributor body 1, can be quickly and evenly distributed to each piping 2. At the same time, the high-speed flow of the refrigerant can also reduce irreversible heat transfer losses, thereby improving heat exchanger performance. Furthermore, the smaller pipe diameter and wall thickness also give the piping body 21 excellent forming and processing capabilities. When the refrigerant distributor is assembled into the refrigeration system piping, the end of the second connecting section 222 can be bent to face the system piping to which it is assembled. Preferably, the outer diameter and wall thickness of the piping body 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 utility model does not impose any limitations on this.

[0094] Similar to Embodiment 1, although this embodiment uses a stainless steel pipe as the piping body 21 as an example, the present invention does not impose any limitations on this. In other embodiments, the piping body may also be one or more combinations of stainless steel pipe, copper pipe, and aluminum pipe.

[0095] Similar to Embodiment 1, in this embodiment, the connector 22 is a circular pipe. The upstream end of the circular pipe is narrowed to form a first connecting section 221 with an inner diameter matching the outer diameter of the pipe body 21. The outer peripheral wall of the pipe body 21 is brazed to the first connecting section 221. A solder receiving area 101 is formed in the annular cavity 100 near the first connecting section 221 to accommodate excess solder during welding. However, this invention does not impose any limitations on this aspect.

[0096] The specific structure and possible implementation of components such as the distributor body 1, connector 22, first connecting section 221, annular cavity 100, solder receiving area 101, and blocking member 23 are basically the same in this embodiment as in Embodiment 1 and its variations. For example, the connector includes a circular tube and an inner liner fitted inside the upstream end of the circular tube. The inner diameter of the inner liner matches the outer diameter of the pipe body, and the location of the inner liner forms the first connecting section. The inner diameter of the circular tube on the first connecting section is less than or equal to the inner diameter of the circular tube at the second connecting section. Alternatively, the connector is a tension member. The upstream end of the tension member has a flanged hole for welding to the pipe body, the location of the flanged hole forms the first connecting section, and the downstream end of the tension member is open to form the second connecting section, etc. Further details are omitted here.

[0097] Example 5

[0098] Similar to the design concept of Embodiment 4, this embodiment provides another refrigerant distributor. The refrigerant distributor provided in this embodiment controls the degree of refrigerant expansion within the piping 2 by controlling the pipe diameter of the piping body 21 and the maximum inner diameter Dmax of the second connecting section 222.

[0099] like Figure 27 As shown, the refrigerant distributor provided in this embodiment includes a distributor body 1 and multiple pipes 2. Each pipe 2 includes a pipe body 21 and a connector 22 welded together. The connector 22 includes a first connecting section 221 and a second connecting section 222 located away from the distributor body 1 and having an inner diameter larger than the outer diameter of the pipe body 21. The end of the pipe body 21 is welded to the first connecting section 221 and does not extend to the second connecting section 222. The second connecting section 222 is welded to an external pipeline and forms a refrigerant output end. The inner diameter of the pipe body 21 is less than or equal to 4.14 mm, and the maximum inner diameter Dmax of the second connecting section 222 is less than or equal to 6.5 mm.

[0100] The refrigerant distributor provided in this embodiment achieves a high flow velocity of the refrigerant output from the piping body 21 by controlling the inner diameter of the piping body 21. Although the refrigerant inevitably expands and slows down as it flows through the second connecting section 222, the high flow velocity output from the front-end piping body 21 provides space for this expansion and slowdown. Based on this, the maximum inner diameter Dmax of the second connecting section 222 can effectively suppress the degree of refrigerant expansion and slowdown, thus ensuring that the refrigerant performance parameters output by the second connecting section 222 meet the requirements of the downstream heat exchanger components while achieving welded assembly.

[0101] In this embodiment, the piping body 21 includes a stainless steel pipe section. Preferably, the outer diameter of the stainless steel pipe section is greater than or equal to 2 mm and less than or equal to 4.5 mm, and its wall thickness is 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 refrigerant, due to its small flow cross-sectional area, can suppress refrigerant expansion and maintain a high flow velocity. The refrigerant, after thorough mixing of the gas and liquid phases in the distributor body 1, can be quickly and evenly distributed to each piping 2. At the same time, the high-speed flow of the refrigerant can also reduce irreversible heat transfer losses and improve heat exchanger performance. Furthermore, the smaller pipe diameter and wall thickness also give the piping body 21 excellent forming and processing capabilities. When the refrigerant distributor is assembled into the refrigeration system piping, the end of the second connecting section 222 can be bent to face the system piping to which it is assembled. Preferably, the outer diameter and wall thickness of the piping body 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 utility model does not impose any limitations on this.

[0102] Similar to Embodiment 1, although this embodiment uses a stainless steel pipe as the piping body 21 as an example, the present invention does not impose any limitations on this. In other embodiments, the piping body may also be one or more combinations of stainless steel pipe, copper pipe, and aluminum pipe.

[0103] Similar to Embodiment 1, in this embodiment, the connector 22 is a circular pipe. The upstream end of the circular pipe is narrowed to form a first connecting section 221 whose inner diameter matches the outer diameter of the pipe body 21. The end of the pipe body 21 is inserted into the first connecting section 221, and its end face is substantially located at the junction of the first connecting section 221 and the second connecting section 222. The outer peripheral wall of the pipe body 21 is brazed to the first connecting section 221. However, this invention does not impose any limitations on this. In other embodiments, the end of the pipe body 21 may also be fitted over the first connecting section.

[0104] The specific structure and possible implementation of components such as the distributor body 1, connector 22, and first connecting section 221 are basically the same in this embodiment as in Embodiment 1 and its variations. For example, the connector includes a circular tube and an inner liner fitted inside the upstream end of the circular tube. The inner diameter of the inner liner matches the outer diameter of the piping body, and the location of the inner liner forms the first connecting section. The inner diameter of the circular tube on the first connecting section is less than or equal to the inner diameter of the circular tube at the second connecting section. Or, as... Figure 28 As shown, connector 22 is a tension member. The upstream end of the tension member has a flanged hole for welding and connecting the piping body. The flanged hole forms the first connecting section 221. The downstream end of the tension member is open to form the second connecting section 222, etc. Further details are omitted here.

[0105] In summary, the refrigerant distributor provided by this invention forms a refrigerant output end by inserting a smaller-diameter piping body into a connector, with its end extending substantially to or beyond the end of the second connecting section of the connector. Simultaneously, an annular cavity is formed between the piping body and the second connecting section to allow the diameter of the second connecting section to match the external pipeline welding. This arrangement ensures that the refrigerant is only transported within the smaller-diameter piping body, and the connection of the external pipeline is only related to the larger-diameter second connecting section. The refrigerant transport channel and the external pipeline connection section are independent of each other. Therefore, the design of the piping body only needs to meet the refrigerant transport performance requirements of the downstream heat exchanger assembly, and the design of the second connecting section only needs to meet the welding assembly requirements. The two no longer constrain each other, thus enabling the refrigerant distributor provided by this invention to simultaneously meet the requirements of refrigerant distribution performance and welding assembly.

[0106] Furthermore, in the refrigerant distributor provided by this utility model, the molding method of the annular cavity and the first connection also allows pipe bodies of different specifications to share the same connector blank, effectively solving the problems of production management, production cost and inventory pressure caused by the customization of the inner liner according to the specifications of the branch pipe in the existing distributor.

[0107] 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 refrigerant distributor, characterized in that, include: The distributor body has multiple pipe holes at its outlet end; Multiple pipes are welded to multiple pipe holes of the distributor body. Each pipe includes a pipe body and a connector that are welded together. The connector includes a first connecting section and a second connecting section that is far away from the distributor body and has an inner diameter larger than the outer diameter of the pipe body. The piping body is inserted into the connector and its end extends substantially to or beyond the end of the second connecting section to form a refrigerant output end. An annular cavity is formed between the piping body and the second connecting section so that the diameter of the second connecting section matches the external pipeline welding.

2. The refrigerant distributor according to claim 1, characterized in that, The end of the piping body is formed with a blocking element that shields the annular cavity to prevent refrigerant from entering the annular cavity.

3. The refrigerant distributor according to claim 2, characterized in that, The end peripheral wall of the piping body is bent outward in a radial direction and the extended end basically abuts against the second connecting section to form a blocking element. Alternatively, the end peripheral wall of the second connecting segment is bent inward along the radial direction and the extended end substantially abuts against the piping body to form a blocking element.

4. The refrigerant distributor according to claim 2, characterized in that, The blocking element is one or more sequentially stacked annular shielding plates embedded in the annular cavity, and the annular shielding plates are welded to the second connecting section and / or the end of the piping body.

5. The refrigerant distributor according to claim 1, characterized in that, The piping body is brazed to the first connecting section, and the annular cavity near the first connecting section forms a solder receiving area to accommodate excess brazing solder during welding.

6. The refrigerant distributor according to claim 1, characterized in that, The axial length L of the second connecting segment satisfies 7mm≤L≤80mm. The axial length of the second connecting segment refers to the axial distance from the connection point of the first connecting segment and the second connecting segment to the end of the second connecting segment.

7. The refrigerant distributor according to claim 1, characterized in that, The piping body is one or more of stainless steel pipe, copper pipe, and aluminum pipe.

8. The refrigerant distributor according to claim 1, characterized in that, The piping body includes a stainless steel pipe section 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.

9. The refrigerant distributor according to claim 1, characterized in that, The connector is a circular pipe fitting, and the upstream end of the circular pipe fitting is narrowed to form a first connecting section whose inner diameter matches the outer diameter of the pipe body. Alternatively, the connector may include a circular tube and an inner liner fitted inside the upstream end of the circular tube, wherein the inner diameter of the inner liner matches the outer diameter of the pipe body, and a first connecting section is formed at the location of the inner liner.

10. The refrigerant distributor according to claim 1, characterized in that, The connector is a tension member. The upstream end of the tension member has a flanged hole for welding and connecting the piping body. The flanged hole forms a first connecting section. The downstream end of the tension member is open to form a second connecting section.

11. A refrigerant distributor, characterized in that, include: The distributor body has multiple pipe holes at its outlet end; Multiple pipes are welded to multiple pipe holes of the distributor body. Each pipe includes a pipe body and a connector that are welded together. The connector includes a first connecting section and a second connecting section that is far away from the distributor body and has an inner diameter larger than the outer diameter of the pipe body. Wherein, the piping body is inserted into the connector and its end extends into the second connecting section, an annular cavity is formed between the piping body and the second connecting section so that the pipe diameter of the second connecting section matches the external pipeline welding, the end of the second connecting section forms a refrigerant output end, and the maximum inner diameter Dmax of the transmission section used to transmit refrigerant in the second connecting section is less than or equal to 6.5mm, the transmission section refers to the second connecting section area located downstream of the end of the piping body.

12. The refrigerant distributor according to claim 11, characterized in that, The piping body is brazed to the first connecting section, and the annular cavity near the first connecting section forms a solder receiving area to accommodate excess brazing solder during welding.

13. The refrigerant distributor according to claim 11, characterized in that, The piping body is one or more of stainless steel pipe, copper pipe, and aluminum pipe.

14. The refrigerant distributor according to claim 11, characterized in that, The piping body includes a stainless steel pipe section 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.

15. The refrigerant distributor according to claim 11, characterized in that, The connector is a circular pipe fitting, and the upstream end of the circular pipe fitting is narrowed to form a first connecting section whose inner diameter matches the outer diameter of the pipe body. Alternatively, the connector may include a circular tube and an inner liner fitted inside the upstream end of the circular tube, wherein the inner diameter of the inner liner matches the outer diameter of the pipe body, and a first connecting section is formed at the location of the inner liner. Alternatively, the connector is a tension member, with a flanged hole formed at its upstream end for welding and connecting the piping body, forming a first connecting section at the location of the flanged hole, and the downstream end of the tension member being open to form a second connecting section.

16. A refrigerant distributor, characterized in that, include: The distributor body has multiple pipe holes at its outlet end; Multiple pipes are welded to multiple pipe holes of the distributor body. Each pipe includes a pipe body and a connector that are welded together. The connector includes a first connecting section and a second connecting section that is far away from the distributor body and has an inner diameter larger than the outer diameter of the pipe body. Wherein, the end of the piping body is welded to the first connecting section and does not extend to the second connecting section, the second connecting section is welded to the external pipeline and forms a refrigerant output end, the inner diameter of the piping body is less than or equal to 4.14 mm, and the maximum inner diameter Dmax of the second connecting section is less than or equal to 6.5 mm.

17. The refrigerant distributor according to claim 16, characterized in that, The piping body includes a stainless steel pipe section 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.

18. The refrigerant distributor according to claim 16, characterized in that, The piping body is one or more of stainless steel pipe, copper pipe, and aluminum pipe.

19. The refrigerant distributor according to claim 16, characterized in that, The connector is a circular pipe fitting, and the upstream end of the circular pipe fitting is narrowed to form a first connecting section whose inner diameter matches the outer diameter of the pipe body. Alternatively, the connector may include a circular tube and an inner liner fitted inside the upstream end of the circular tube, wherein the inner diameter of the inner liner matches the outer diameter of the pipe body, and a first connecting section is formed at the location of the inner liner. Alternatively, the connector is a tension member, with a flanged hole formed at its upstream end for welding and connecting the piping body, forming a first connecting section at the location of the flanged hole, and the downstream end of the tension member being open to form a second connecting section.

20. A heat exchanger assembly, characterized in that, Includes the refrigerant distributor as described in any one of claims 1 to 19.

21. A refrigeration system, characterized in that, Includes the heat exchanger assembly as described in claim 20.

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