Connecting assembly, silencer assembly and machining die

Abstract

The connecting assembly comprises a copper part and an aluminum part, the copper part comprises a first main body part and a first combination part, the aluminum part comprises a second main body part and a second combination part, and the first main body part and the first combination part are fixedly connected or are of an integrated structure. The second main body part and the second joint part are fixedly connected or are of an integrated structure, the first joint part and the second joint part are fixed through welding, the connecting assembly comprises a welding part, and the welding part comprises welding flux. At least part of the welding flux is located between the outer peripheral wall of the first joint part and the inner peripheral wall of the second joint part, and the welding flux comprises aluminum.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and particularly to a connection component, a silencer component, and a processing mold for processing the connection component or the silencer component. Background Art

[0002] In an air-conditioning system, copper pipes are generally used to connect various components. For example, the connection between the indoor heat exchanger and the outdoor heat exchanger. However, due to the continuous increase in the price of copper materials in recent years, the cost of air-conditioning products has increased. In the air-conditioning system, aluminum-copper composite pipes are used to replace copper pipes, which greatly reduces the cost of air-conditioning products. The aluminum-copper composite pipe is a bimetallic structure pipe with copper on the outer layer and aluminum on the inner layer. The melting point temperature of the outer copper layer is about 1088 degrees, and the melting point of the inner aluminum layer is about 660 degrees. The composition of the existing solder contains copper and phosphorus, and the melting point is about 750 degrees. However, during the welding process of the aluminum-copper composite pipe, when the heating temperature exceeds 350 degrees, the bonding surface between the copper layer and the aluminum layer begins to oxidize and separate, thereby reducing the service life of the aluminum-copper composite pipe. Summary of the Invention

[0003] The purpose of this application is to provide a connection component, a silencer component, and a processing mold for processing the connection component and the silencer component, which can reduce costs and have a relatively high service life.

[0004] This application provides a connection component on the one hand, which includes a copper component and an aluminum component. The copper component includes a first main body part and a first joint part. The aluminum component includes a second main body part and a second joint part. The first main body part and the first joint part are fixedly connected or are an integral structure. The second main body part and the second joint part are fixedly connected or are an integral structure. The first joint part and the second joint part are fixedly connected by welding. The connection component includes a welding part, and at least part of the welding part is located between the outer peripheral wall of the first joint part and the inner peripheral wall of the second joint part. The composition of the welding part includes aluminum.

[0005] This connection component welds and fixes the copper component and the aluminum component. The material of the welding part includes aluminum, and the melting point is relatively low. Moreover, the molten solder has strong fluidity and good fluidity, and can better fill between the outer peripheral wall of the first joint part and the inner peripheral wall of the second joint part. The welding effect is good, which helps to provide the service life of the connection component.

[0006] On the other hand, the present application provides a muffler assembly, including a muffler pipe and a muffler housing. The muffler housing includes a cylindrical portion and port portions located at both ends of the cylindrical portion. The muffler pipe includes a muffling section and a connecting section. The material of the connecting section is copper, and the material of the muffler housing is aluminum. The connecting section and the port portion are fixed by welding. The muffler assembly includes a welding portion, and at least part of the welding portion is located between the outer peripheral wall of the connecting section and the inner peripheral wall of the port portion. The component of the welding portion includes aluminum.

[0007] By setting the muffler housing to be made of aluminum and the material of the muffler pipe connected to the external copper pipe to be copper, this muffler assembly helps to reduce the product weight and cost, and can also ensure the welding with the external copper pipe.

[0008] On yet another aspect, the present application provides a processing mold, including an expanding mold and a clamping mold. The clamping mold includes a receiving cavity. The expanding mold includes an inserting section and an expanding section. The inserting section and the expanding section are located in the receiving cavity. The diameter of the expanding section is larger than that of the inserting section. A transition section is connected between the expanding section and the inserting section, and the diameter of the transition section gradually decreases from the expanding section to the inserting section.

[0009] By placing the aluminum component to be processed in the clamping mold and the expanding mold extending into the aluminum component to control the size of the welding part of the aluminum component through extrusion, the size of the welding part is ensured by the processing mold before welding the aluminum component, which can ensure the subsequent welding quality without increasing the processing difficulty when cutting the aluminum component. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the connection assembly of the present application;

[0011] Figure 2 is a schematic structural diagram of an embodiment of the muffler assembly of the present application;

[0012] Figure 3 is a schematic structural diagram of another embodiment of the muffler assembly of the present application;

[0013] Figure 4 is a schematic structural diagram of the processing mold of the present application;

[0014] Figure 5 is a schematic cross-sectional structural diagram of the assembled processing mold of the present application;

[0015] Figure 6 is for the processing of the processing mold of the present application Figure 2 schematic cross-sectional structural diagram of the embodiment.

[0016] Reference numerals:

[0017] 100, Connection Component; 1, Copper Component; 2, Aluminum Component; 11, Main Body Portion; 12, First Joint Portion; 21, Second Main Body Portion; 22, Second Joint Portion; 221, Flared Section; 222, Fitting Section; 3, Welding Portion; 31, Solder; 311, Weld Ring; 2221, Flanged Portion; 200, Silencer Component; 201, Silencing Tube; 202, Silencer Housing; 2021, Cylindrical Portion; 2022, Portion; 2023, Flanged Outer Portion; 2011, Silencing Section; 2012, Connection Section; 2031, Fitting Section; 2032, Adapter Section; 300, Mold; 301, Expanding Mold; 302, Clamping Mold; 3021, Accommodating Cavity; 3011, Insertion Section; 3012, Diameter Expanding Section; 3013, Transition Section; 3014, Flanging Section. Specific Embodiment

[0018] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0019] It should be understood that the "first", "second" and similar terms used in the specification and claims of the present application do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not denote a quantity limitation, but mean that there is at least one; "several" means two or more quantities, unless otherwise specified. The orientation terms such as up, down, left, right, front, back, inner, outer, top, bottom, etc. mentioned or likely to be mentioned in the text are defined relative to the structure shown in the corresponding drawings, and they are relative concepts, so they may change accordingly depending on their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms. The terms "including" or "comprising" and similar terms mean that the elements or items appearing before "including" or "comprising" cover the elements or items listed after "including" or "comprising" and their equivalents, and do not exclude other elements or items.

[0020] The pipeline components of the exemplary embodiments of the present application will be described in detail below with reference to the drawings. Without conflict, the features in the following embodiments and implementation manners can be supplemented or combined with each other.

[0021] Some embodiments will be specifically described below with reference to the drawings.

[0022] As Figure 1, The connecting component 100 includes a copper component 1 and an aluminum component 2. The copper component 1 includes a first main body portion 11 and a first joint portion 12, and the aluminum component 2 includes a second main body portion 21 and a second joint portion 22. The first main body portion 11 and the first joint portion 12 are fixedly connected or are an integral structure, and the second main body portion 21 and the second joint portion 22 are fixedly connected or are an integral structure; the first joint portion 12 and the second joint portion 22 are fixedly connected by welding. In some embodiments, at least a part of the first joint portion 12 is located radially inside the second joint portion 22, that is, at least a part of the outer peripheral wall of the first joint portion 12 is connected to the inner peripheral wall of the second joint portion 22 by welding. Of course, in some other embodiments, it may be that the second joint portion 22 is located radially inside the first joint portion 12, that is, at least a part of the outer peripheral wall of the second joint portion 22 is connected to the inner peripheral wall of the first joint portion 12 by solder, thereby realizing the fixed connection between the copper component 1 and the aluminum component 2.

[0023] As Figure 1 , The second joint portion 22 includes a flared section 221 and a mating section 222. The mating section 222 is connected to the second main body portion 21 through the flared section 221. Specifically, one end of the flared section 221 is connected to the second main body portion 21, and the other end is connected to the flared section 221; the minimum inner diameter of the flared section 221 is smaller than the outer diameter of the end face of the first joint portion 12. When the first joint portion 12 is inserted into the second joint portion 22, the end face of the first joint portion 12 abuts against the flared section 221, realizing the limitation of the insertion depth of the first joint portion 12 into the second joint portion 22. Further, the first joint portion 12 and the second joint portion 22 are in clearance fit or interference fit; the connecting component 100 includes a welding portion 3, and at least a part of the welding portion 3 is located between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22. Further, during the welding process, the solder 31 melts, and at least a part of the solder 31 is located between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22. Of course, during the welding process, a part of the first joint portion 12 and a part of the second joint portion 22 are melted by heat and then fused with the solder 31 to form a part of the welding portion 3. Thus, the welding portion 3 can effectively connect the copper component 1 and the aluminum component 2, realizing the welding and fixing of the copper component 1 and the aluminum component 2, and the welding strength is high.

[0024] As Figure 1 , The mating section 222 includes a flanging portion 2221. The flanging portion 2221 extends from the end of the mating section 222 toward the side away from its axis. The flanging portion 2221 is generally in a flared shape. When the copper component 1 and the aluminum component 2 are welded, the molten solder 31 is received by the flanging portion 2221, and under the action of capillary effect, the solder 31 flows into the gap between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22. Further, the welding and fixing of the copper component 1 and the aluminum component 2 are realized by the partial fusion of the first joint portion 12 and / or the second joint portion 22.

[0025] Further, the welding of the copper component 1 and the aluminum component 2 is carried out by flame welding or high-frequency welding. The solder 31 is an aluminum cored solder ring, and the material of the solder 31 includes metallic aluminum and silicon. Further, the content of silicon is not less than 12 wt%, so that the melting point of the solder 31 is low and the fluidity is relatively high. The melting point of the solder 31 is between 500 - 580 degrees, which facilitates the solder 31 to flow into the space between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22 through capillary action. The space between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22 can be achieved by controlling the fitting tolerance of the copper pipe fitting 1 and the aluminum pipe fitting 2, which helps to reduce the processing difficulty of the product.

[0026] Further, the solder 31 is a solder ring 311. The solder ring 311 can be one turn or multiple turns, and multiple turns include two turns and more than two turns. The solder ring 311 includes a wire diameter r and an inner diameter R1. Here, the "wire diameter" means that when the cross-section of the welding wire forming the solder ring 311 is circular, the wire diameter refers to the diameter of the circular cross-section; when the cross-section of the welding wire is non-circular, the wire diameter refers to the diameter of the circular cross-section with the same cross-sectional area as the welding wire. Define the outer diameter of the first joint portion 12 or the inner diameter of the second joint portion 22 as R2. In some embodiments, R1 < R2 and r < 2.5 mm. If the wire diameter is too large, it is likely that the molten solder 31 cannot fall into the space between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22 in time, and a large amount of the solder 31 overflows to the outside of the second joint portion 22, resulting in poor welding. In some embodiments, when R2 increases, such as when R2 ≥ 15 mm, the solder ring 311 is set as multiple turns, for example, two turns, and the wire diameter r of the solder ring 311 < 2.5 mm. Further, 1.5 mm < r < 2.5 mm. Selecting multiple-turn solder rings 311 helps to ensure sufficient solder for welding a larger pipe diameter without increasing the wire diameter r and guarantees the welding strength.

[0027] Such as Figure 2, in some embodiments, the connecting component 100 is a silencer component 200. Specifically, the silencer component 200 includes a silencing pipe 201 and a silencer housing 202. The silencer housing 202 includes a cylindrical portion 2021 and port portions 2022 located at both ends of the cylindrical portion 2021. The material of the silencer housing 202 is copper. The silencing pipe 201 includes a silencing section 2011 and a connecting section 2012. The material of the connecting section 2012 is aluminum. The outer peripheral wall of the connecting section 2012 and the inner peripheral wall of the port portion 2022 are fixed by welding. Specifically, the connecting section 2012 and the port portion 2022 are in clearance fit or interference fit. The silencer component 200 includes a welding portion 3. At least part of the welding portion 3 is located between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22. Further, during the welding process, the solder 31 melts, and at least part of the solder 31 is located between the outer peripheral wall of the connecting section 2012 and the inner peripheral wall of the port portion 2022. Of course, during the welding process, part of the connecting section 2012 and / or the port portion 2022 is melted by heat and then fused with the solder 31 to form a part of the welding portion 3. Thus, the welding portion 3 can effectively connect the connecting section 2012 and the port portion 2022, realizing the welding and fixing of the silencing pipe 201 and the silencer housing 202, and the welding strength is high.

[0028] Further, define the inner diameter of the solder ring 311 as R1, and the outer diameter of the connecting section 2012 or the inner diameter of the port portion 2022 as R3. Among them, R1 < R3; if the wire diameter is too large, it is easy to cause the molten solder 31 not to fall into the space between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22 in time, and a large amount of solder 31 overflows to the outside of the second joint portion 22, resulting in poor welding. In some embodiments, when R3 increases, such as when R2 ≥ 15 mm, the solder ring 311 is set to multiple turns, for example, two turns, and the wire diameter r of the solder ring 311 < 2.5 mm. Further, 1.5 mm < r < 2.5 mm. Selecting multiple turns of the solder ring 311 helps to ensure sufficient solder for welding a larger pipe diameter without increasing the wire diameter r, ensuring the welding strength.

[0029] Further, as Figure 2 , the port portion 2022 includes an outwardly turned portion 2023. The outwardly turned portion 2023 extends from the end of the port portion 2022 toward the side away from its axis. The outwardly turned portion 2023 is generally in a flared shape. When the silencing pipe 201 and the silencer housing 202 are welded, the molten solder 31 is received by the outwardly turned portion 2023. Under the action of capillary effect, the solder 31 flows into the gap between the outer peripheral wall of the connecting section 2012 and the inner peripheral wall of the port portion 2022, and further fuses with part of the connecting section 2012 and / or the port portion 2022 to realize the welding and fixing of the silencing pipe 201 and the silencer housing 202.

[0030] As Figure 2, the silencer assembly 200 includes an adapter pipe 203. The material of the adapter pipe 203 includes copper. The adapter pipe 203 includes a mating section 2031 and an adapter section 2032. The outer peripheral wall of the mating section 2031 and the inner peripheral wall of the port portion 2022 are fixed by welding. Specifically, the mating section 2031 and the port portion 2022 are in clearance fit or interference fit. At least part of the solder 31 is located between the outer peripheral wall of the mating section 2031 and the inner peripheral wall of the port portion 2022. Of course, during the welding process, part of the mating section 2031 and / or the port portion 2022 will be melted by heat and fused with the solder 31 to form a part of the welded joint 3. Thus, the welded joint 3 can effectively connect the mating section 2031 and the port portion 2022, realizing the welded fixation of the adapter pipe 203 and the silencer housing 202, and the welding strength is high.

[0031] As Figure 3 , in another embodiment, the connection assembly 100 is a silencer assembly 200. The silencer assembly 200 includes a copper component 1 and a silencing pipe 201. The copper component 1 includes a first joint portion 12. The silencing pipe 201 includes a silencing section 2011 and a connection section 2012. At least part of the first joint portion 12 is located in the connection section 2012. Specifically, the first joint portion 12 and the connection section 2012 are fixed by welding. Specifically, the first joint portion 12 and the connection section 2012 are in clearance fit or interference fit. The silencer assembly 200 includes a welded joint 3. At least part of the welded joint 3 is located between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22. Further, during the welding process, the solder 31 melts, and at least part of the solder 31 is located between the outer peripheral wall of the first joint portion 12 and the inner peripheral wall of the connection section 2012. Of course, during the welding process, part of the first joint portion 12 and / or the connection section 2012 will be melted by heat and fused with the solder 31 to form a part of the welded joint 3. Thus, the welded joint 3 can effectively connect the first joint portion 12 and the connection section 2012, realizing the welded fixation of the silencing pipe 201 and the copper component 1, and the welding strength is high.

[0032] Further, define the outer diameter of the first joint portion 12 or the inner diameter of the connection section 2012 as R4, where R1 < R4; if the wire diameter is too large, it is easy to cause the molten solder 31 not to fall into the space between the outer peripheral wall of the first joint portion 12 and the outer peripheral wall of the second joint portion 22 in time, and a large amount of solder 31 overflows to the outside of the second joint portion 22, resulting in poor welding. In some embodiments, when R4 increases, such as when R2 ≥ 15 mm, the solder ring 311 is set to multiple turns, for example, two turns, and the wire diameter r of the solder ring 311 < 2.5 mm. Further, 1.5 mm < r < 2.5 mm. Selecting multiple turns of the solder ring 311 helps to ensure sufficient solder for welding a larger pipe diameter without increasing the wire diameter r, ensuring the welding strength.

[0033] Furthermore, the aluminum component 2 can also include a silencer shell 202. Of course, in some embodiments, the silencer shell 202 can be made of aluminum, stainless steel, carbon steel or other materials. The silencer shell 202 includes a barrel portion 2021 and a port portion 2022 located at both ends of the barrel portion 2021. At least part of the silencer pipe 201 is located in the silencer shell 202. Furthermore, the connecting section 2012 and the port portion 2022 are fixed by welding. By setting the silencer pipe 201 to be made of aluminum, along the radial direction of the silencer 200, at least part of the connecting section 2012 is located between the port portion 2022 and the first joint portion 12. The copper component 1 and the silencer shell 202 with stainless steel or carbon steel as the main material are connected through the silencer pipe 201 with aluminum as the main material. On the one hand, the use of aluminum material helps to reduce product weight and cost. On the other hand, retaining the copper component 1 as an interface for connecting the external copper pipe facilitates welding.

[0034] like Figures 4 to 6 The present application also includes a mold 300 for preparing the aluminum part 2 as described above, the mold 300 includes an expansion mold 301 and a clamping mold 302, the clamping mold 302 includes a accommodating cavity 3021, and at least part of the expansion mold 301 can be located in the accommodating cavity 3021 of the clamping mold 302. Specifically, the expansion mold 301 includes an extension section 3011 and an expansion section 3012, the extension section 3011 and the expansion section 3012 are located in the accommodating cavity 3021, the diameter of the expansion section 3012 is larger than the diameter of the extension section 3011, further, a transition section 3013 is connected between the expansion section 3012 and the extension section 3011, the outer peripheral surface of the transition section 3013 is generally conical, or it can be said that the diameter of the transition section 3013 gradually decreases from the expansion section 3012 to the extension section 3011.

[0035] Further, such as Figure 4 The expansion mold 301 includes a flanging section 3014, which is connected to the end of the diameter expansion section 3012 away from the transition section 3013. The outer peripheral surface of the flanging section 3014 is generally a conical surface. It can also be said that the diameter of the flanging section 3014 gradually increases from the end of the diameter expansion section 3012 to the side away from the diameter expansion section 3012.

[0036] Furthermore, the accommodating cavity 3021 and the clamping mold 302 located in the accommodating cavity 3021 are arranged in a coordinated manner. Specifically, there is a distance D between the inner wall surface of the accommodating cavity 3021 and the outer peripheral wall surface of the clamping mold 302, and at least part of the aluminum component 2 can be located in the distance D.

[0037] In some embodiments, the aluminum component 2 is a tube, for example Figure 1 and Figure 3, One end of the aluminum component 2' to be processed is placed in the accommodation cavity 3021 of the clamping die 302. The expanding die 301 is inserted into the aluminum component 2 and moved downward until the flanging section 3014 abuts against the end of the aluminum component 2. Under the extrusion of the expanding die 301, the second joint 22 is formed on the aluminum component 2 or the connecting section 2012 is formed on the silencing pipe 201. By using the die 300 to process the end mating structure of the aluminum component 2, the dimensions of the welding part of the aluminum component 2 can be well controlled, ensuring the effective control of the assembly tolerance between the copper component 1 and the aluminum component 2, so that the solder 31 can flow between the copper component 1 and the aluminum component 2 through siphon or capillary action after melting, realizing good welding between the two. In some other embodiments, the aluminum component 2 is a tank body, for example Figure 2 , One end of the aluminum component 2' to be processed is put into the accommodation cavity 3021 of the clamping die 302 after necking treatment. The expanding die 301 is inserted into the aluminum component 2 and moved downward until the flanging section 3014 abuts against the end of the aluminum component 2. Under the extrusion of the expanding die 301, the port part 2022 is formed on the aluminum component 2. By using the die 300 to process the end mating structure of the silencer housing 202, the dimensions of the welding part of the silencer housing 202 can be well controlled, ensuring the effective control of the assembly tolerance between the silencing pipe 201 and the silencer housing 202, so that the solder 31 can flow between the silencing pipe 201 and the silencer housing 202 through siphon or capillary action after melting, realizing good welding between the two.

[0038] Furthermore, as Figure 5 and Figure 6 , The end of the aluminum component 2' to be processed protrudes from the opening of the clamping die 302, that is, along the axis of the clamping die 302, the end face of the aluminum component 2' to be processed is located outside the accommodation cavity 3021 of the clamping die 302. When the expanding die 301 is pressed downward, the flanging section 3014 of the expanding die 301 and the end face of the clamping die 302 realize flanging processing on the end of the aluminum component 2' to be processed, and the flanging part 2221 of the aluminum component 2 or the outer flanging part 2023 of the port part 2022 is processed.

[0039] It should be noted that the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although the present specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the art can still modify the present invention or make equivalent replacements, and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A connecting component, characterized in that, It includes a copper component (1) and an aluminum component (2). The copper component (1) includes a first main body portion (11) and a first joint portion (12). The aluminum component (2) includes a second main body portion (21) and a second joint portion (22). The first main body portion (11) and the first joint portion (12) are fixedly connected or are of an integral structure. The second main body portion (21) and the second joint portion (22) are fixedly connected or are of an integral structure. The first joint portion (12) and the second joint portion (22) are fixed by welding. The connection assembly includes a welding portion (3). The welding portion (3) includes solder (31). At least part of the solder (31) is located between the outer peripheral wall of the first joint portion (12) and the inner peripheral wall of the second joint portion (22). The composition of the solder (31) includes aluminum.

2. A connecting component, characterized in that, It includes a copper component (1) and an aluminum component (2). The copper component (1) includes a first main body portion (11) and a first joint portion (12). The aluminum component (2) includes a second main body portion (21) and a second joint portion (22). The first main body portion (11) and the first joint portion (12) are fixedly connected or are of an integral structure. The second main body portion (21) and the second joint portion (22) are fixedly connected or are of an integral structure. The first joint portion (12) and the second joint portion (22) are fixed by welding. The connection assembly includes a welding portion (3). At least part of the welding portion (3) is located between the outer peripheral wall of the first joint portion (12) and the inner peripheral wall of the second joint portion (22). The composition of the welding portion (3) includes aluminum.

3. The connection component according to claim 1 or 2, characterized in that, The first joint portion (12) and the second joint portion (22) are in clearance fit or interference fit. The composition of the welding portion (3) includes silicon, and the content of the silicon is not less than 12 wt%.

4. The connecting component according to any one of claims 1-3, characterized in that, The second joint portion (22) includes a flared section (221) and a mating section (222). The mating section (222) is connected to the second main body portion (21) through the flared section (221). The minimum inner diameter of the flared section (221) is smaller than the outer diameter of the end face of the first joint portion (12). The end face of the first joint portion (12) abuts against the flared section (221).

5. The connecting component according to claim 4, characterized in that, The mating section (222) includes a flanging portion (2221). The flanging portion (2221) extends from the end of the mating section (222) towards the side away from the axis of the mating section (222).

6. A silencer component, comprising a silencing pipe (201) and a silencer housing (202), characterized in that, The silencer housing (202) includes a cylindrical part (2021) and port parts (2022) located at both ends of the cylindrical part (2021). The silencing tube (201) includes a silencing section (2011) and a connecting section (2012). The material of the connecting section (2012) is copper, and the material of the silencer housing (202) is aluminum. The connecting section (2012) and the port part (2022) are fixed by welding. The silencer assembly includes a welding part (3), and at least part of the welding part (3) is located between the outer peripheral wall of the connecting section (2012) and the inner peripheral wall of the port part (2022). The component of the welding part (3) includes aluminum.

7. The silencer assembly according to claim 6, wherein, The connecting section (2012) and the port part (2022) are in clearance fit or interference fit. The component of the welding part (3) includes silicon, and the content of the silicon is not less than 12 wt%.

8. A muffler assembly, characterized in that, It includes a copper component (1), a silencing tube (201) and a silencer housing (202). The copper component (1) includes a first joint part (12). The silencing tube (201) includes a silencing section (2011) and a connecting section (2012). The material of the connecting section (2012) is aluminum. The first joint part (12) and the connecting section (2012) are fixed by welding. The silencer assembly includes a welding part (3), and at least part of the welding part (3) is located between the outer peripheral wall of the first joint part (12) and the inner peripheral wall of the connecting section (2012). The component of the welding part (3) includes aluminum. The silencer housing (202) includes a cylindrical part (2021) and port parts (2022) located at both ends of the cylindrical part (2021). The connecting section (2012) and the port part (2022) are fixed by welding.

9. A processing mold, characterized in that, It includes an expanding die (301) and a clamping die (302). The clamping die (302) includes a receiving cavity (3021). The expanding die (301) includes an inserting section (3011) and an expanding diameter section (3012). The inserting section (3011) and the expanding diameter section (3012) are located in the receiving cavity (3021). The diameter of the expanding diameter section (3012) is larger than that of the inserting section (3011). A transition section (3013) is connected between the expanding diameter section (3012) and the inserting section (3011). From the expanding diameter section (3012) to the inserting section (3011), the diameter of the transition section (3013) gradually decreases.

10. The processing mold according to claim 10, characterized in that, The expanding die (301) includes a flanging section (3014). The flanging section (3014) connects one end of the expanding diameter section (3012) far from the transition section (3013), and the flanging section (3014) is located outside the receiving cavity (3021).

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