Copper-iron composite pipe

Abstract

The invention relates to the technical field of compressors, in particular to a copper-iron composite pipe which comprises a connecting pipe, an iron pipe used for being connected with a compressor is arranged on one side of the connecting pipe, the side where the iron pipe is located is defined as the left side, a copper pipe in butt joint with the iron pipe is arranged on the right side of the iron pipe, and the iron pipe and the copper pipe are connected through welding. A plurality of trapezoidal grooves are formed in the inner wall of the right end of the iron pipe, a plurality of trapezoidal blocks matched with the rectangular grooves are arranged on the peripheral surface of the left end of the copper pipe, and the trapezoidal grooves and the trapezoidal blocks are riveted with each other to enhance the connection strength between the copper pipe and the iron pipe; the connecting pipe is arranged to be a pipeline formed by butting an iron pipe and a copper pipe, so that the connecting pipe can be welded between same materials, the situation that welding is not firm due to different melting points between different materials is avoided, and the manufacturing cost of the connecting pipe can be reduced while the welding quality is improved; and through arrangement of the trapezoidal grooves and the trapezoidal blocks, the connection strength between the copper pipe and the iron pipe can be enhanced, and the welding quality between the copper pipe and the iron pipe is improved.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a copper-iron composite pipe. Background Art

[0002] The compressor is a driven fluid machine that boosts low-pressure gas to high-pressure gas. It is the heart of the refrigeration system. There are usually three pipes on the outside of the compressor, namely the suction pipe, the exhaust pipe and the process pipe. The main function of the suction pipe is to guide the low-temperature and low-pressure gaseous refrigerant into the compressor, and the exhaust pipe is responsible for discharging the high-temperature and high-pressure gaseous refrigerant compressed by the compressor into the condenser for heat dissipation. The process pipe is usually used to connect the compressor with other refrigeration components, such as filters, oil separators, etc. The three-pipe design of the compressor is widely used in various refrigeration equipment, such as refrigerators, air conditioners, etc. This design improves the efficiency of the compressor and ensures the stable operation of the refrigeration system.

[0003] For example, a Chinese patent document with the authorization announcement number CN214464767U discloses an exhaust pipe structure for an air-conditioning compressor. The compressor is composed of a copper tube and a base. The head of the copper tube is provided with an alignment boss, which surrounds the copper tube and is evenly arranged. The alignment boss cooperates with the raised pipe of the base. The height of the raised pipe is 3 mm, the height of the alignment boss is 0.3 mm, the circumferential distance of the alignment boss is 0.2 mm, and the distance between the bottom surface of the copper tube and the upper plane of the raised pipe is 2.5 mm. The inner and outer bottoms of the raised pipe are both arc chamfered, the copper tube is made of phosphorus deoxidized copper, and the base is made of copper steel material. The exhaust pipe has a simple structure, a uniform gap between the base and the copper tube, a consistent penetration depth of the brazed joint, and good air tightness of the brazed annulus, which can reduce the vibration of the exhaust pipe by the airflow, thereby reducing the impact of noise.

[0004] However, the exhaust pipe structure has certain defects during use: the compressor base is made of steel, and the exhaust pipe is made of copper. Due to the differences in the melting points and thermal expansion coefficients of steel and copper, it is very difficult to weld the compressor base and the exhaust pipe. As a result, defects such as loose welding and cold welding often occur between the existing compressor casing and the copper pipe welded thereto, which makes the compressor at risk of oil leakage, air leakage, or even water ingress and scrapping. These defects will not only reduce the strength of the welded joints, but may also become potential hazards of refrigerant leakage. Once the refrigerant leaks, it may also cause harm to the environment and human health. Summary of the invention

[0005] The invention provides a copper-iron composite pipe to solve the technical problem that the existing compressor connecting pipes are made of copper material, resulting in loose welding between the connecting pipes and the steel shell, which leads to oil leakage or even scrapping of the compressor.

[0006] In order to solve the above problems, the present invention provides a copper-iron composite pipe adopting the following technical solution: A copper-iron composite pipe comprises a connecting pipe, the connecting pipe is used to connect a compressor and a heat exchanger, one side of the connecting pipe has an iron pipe for connecting to the compressor, the side where the iron pipe is located is defined as the left side, the right side of the iron pipe is provided with a copper pipe butted with the iron pipe, the copper pipe is used to connect to the heat exchanger, and the iron pipe and the copper pipe are connected by welding; The inner wall of the right end of the iron pipe is provided with a plurality of trapezoidal grooves extending left and right, and the outer peripheral surface of the left end of the copper pipe is provided with a plurality of trapezoidal blocks extending left and right and matching with the rectangular grooves. The trapezoidal grooves and the trapezoidal blocks are mortised to each other to enhance the connection strength between the copper pipe and the iron pipe.

[0007] Its beneficial effects are: by setting the connecting pipe as a pipe formed by butting an iron pipe and a copper pipe, the welding of the connecting pipe can be carried out between the same materials, avoiding the occurrence of loose welding caused by welding between different materials, and reducing the manufacturing cost of the connecting pipe while improving the welding quality; the setting of the trapezoidal groove and the trapezoidal block can enhance the connection strength between the copper pipe and the iron pipe, and improve the welding quality between the copper pipe and the iron pipe.

[0008] Furthermore, a steel annular flange for connecting to a compressor housing is provided on the left side of the iron pipe and located on the outer circumferential surface of the iron pipe, and the annular flange is connected to the iron pipe by welding.

[0009] The beneficial effect is that the provision of the flange can increase the welding area between the connecting pipe and the compressor, thereby enhancing the welding strength between the connecting pipe and the compressor.

[0010] Furthermore, the left side of the annular flange has a circumferentially extending welding surface which is inclined rightward from inside to outside, so as to enhance the welding strength between the annular flange and the compressor housing.

[0011] Furthermore, the right end of the inner side of the copper tube has a circumferentially extending chamfer that is inclined rightward from the inside to the outside, so as to improve the welding quality between the copper tube and the heat exchanger.

[0012] The beneficial effect is that the chamfering can evenly distribute the welding wire and flux at the weld between the connecting pipe and the heat exchanger when the connecting pipe and the heat exchanger pipeline are welded, thereby improving the welding quality of the connecting pipe and the heat exchanger.

[0013] Furthermore, the right end of the iron pipe has a 15° chamfer inclined to the left from the inside to the outside, and the left end of the copper pipe has a 15° chamfer inclined to the right from the inside to the outside, so as to improve the welding strength between the copper pipe and the iron pipe during welding.

[0014] The beneficial effect is that the 15° chamfering of the right end of the iron pipe and the left end of the copper pipe can form a V-shaped weld between the copper pipe and the iron pipe, thereby improving the welding strength between the copper pipe and the iron pipe.

[0015] Furthermore, the iron pipe and the copper pipe are both formed by cold heading process.

[0016] The beneficial effect is that the cold heading process can avoid damaging the metal fibers inside the material and improve the mechanical properties of the connecting pipe.

[0017] Furthermore, the diameter of the right side of the iron pipe is larger than the diameter of the left side of the iron pipe, so as to adapt to the heat exchanger and increase the connection strength between the connecting pipe and the heat exchanger.

[0018] Furthermore, the welding methods between the iron pipe and the copper pipe, between the compressor and the annular flange, and between the copper pipe and the heat exchanger are all high-frequency welding.

[0019] Furthermore, the outer peripheral surfaces of the iron pipe and the copper pipe are provided with a protective layer to prevent the connecting pipe from being oxidized and corroded in the air.

[0020] Furthermore, the protective layer is a nickel-plated layer.

[0021] The beneficial effect is that the provision of the nickel-plated protective layer can effectively prevent the iron pipe and the copper pipe from being oxidized and corroded during use, while improving the surface hardness of the connecting pipe and extending the service life of the connecting pipe.

[0022] The beneficial effects of the copper-iron composite pipe provided by the present invention are: 1. By setting the connecting pipe as a pipe formed by butting an iron pipe and a copper pipe, the welding of the connecting pipe can be carried out between the same materials, avoiding the occurrence of loose welding due to different melting points between different materials, and improving the welding quality while reducing the manufacturing cost of the connecting pipe; the setting of the trapezoidal groove and the trapezoidal block can enhance the connection strength between the copper pipe and the iron pipe, and improve the welding quality between the copper pipe and the iron pipe.

[0023] 2. The setting of the flange can increase the welding area between the connecting pipe and the compressor, thereby enhancing the welding strength between the connecting pipe and the compressor.

[0024] 3. The cold heading process can avoid damaging the metal fibers inside the material and improve the mechanical properties of the connecting pipe.

[0025] 4. The chamfer setting can make the welding wire and flux evenly distributed in the weld between the connecting pipe and the heat exchanger when welding the connecting pipe and the heat exchanger pipeline, thereby improving the welding quality of the connecting pipe and the heat exchanger.

[0026] 5. The 15° chamfer at the right end of the iron pipe and the left end of the copper pipe can form a V-shaped weld between the copper pipe and the iron pipe, thereby improving the welding strength between the copper pipe and the iron pipe.

[0027] 6. The setting of the nickel-plated protective layer can effectively prevent the iron pipe and copper pipe from being oxidized and corroded during use, while improving the surface hardness of the connecting pipe and extending the service life of the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 A schematic diagram of the structure of a copper-iron composite pipe provided by the present invention; Figure 2 for Figure 1 The structure of the iron pipe shown Figure 1 ; Figure 3 for Figure 1 The structure of the iron pipe shown Figure 2 ; Figure 4 for Figure 1 Schematic diagram of the structure of the copper tube shown.

[0029] Description of reference numerals: 1. Connecting pipe; 2. Copper pipe; 21. Trapezoidal block; 3. Iron pipe; 31. Trapezoidal groove; 5. Annular flange; 6. Welding surface; 7. Chamfer; 8. 15° chamfer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] The main idea of ​​the present invention is to set the connecting pipe 1 as a pipe welded by an iron pipe 3 and a copper pipe 2 so that the connecting pipe 1 and the compressor can be welded with the same material, thereby avoiding the occurrence of loose welding due to different melting points between different materials, and reducing the manufacturing cost of the connecting pipe 1 while improving the welding quality; the setting of the trapezoidal groove 31 and the trapezoidal block 21 can enhance the connection strength between the copper pipe 2 and the iron pipe 3, and improve the connection stability between the copper pipe 2 and the iron pipe 3.

[0032] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0033] There are usually three pipes on the outside of an existing compressor, namely, an intake pipe, an exhaust pipe and a process pipe. The main function of the intake pipe is to guide the low-temperature and low-pressure gaseous refrigerant into the compressor, while the exhaust pipe is responsible for discharging the high-temperature and high-pressure gaseous refrigerant compressed by the compressor into the condenser for heat dissipation. The process pipe is usually used to connect the compressor with other refrigeration components, such as filters, oil separators, etc. The three-pipe design of the compressor is widely used in various refrigeration equipment, such as refrigerators, air conditioners, etc. This design improves the efficiency of the compressor and ensures the stable operation of the refrigeration system.

[0034] However, the three existing compressor pipes are generally copper pipes. When the copper pipes are welded to the steel compressor housing, the significant difference in melting point and thermal expansion coefficient between the two materials makes it difficult to weld the compressor and the exhaust pipe.

[0035] First, the melting points of copper and steel are quite different, which requires operators to accurately control the welding temperature during the welding process to ensure that the two materials can reach the melting state at the same time and achieve a good metallurgical bond. However, it is often difficult to accurately grasp this balance point in actual operation, resulting in uneven welding quality.

[0036] Secondly, the difference in thermal expansion coefficients between copper and steel will cause copper and steel to expand to different degrees after being heated. If the welding process is not properly controlled, stress concentration and deformation will easily occur during the cooling process, thus affecting the strength and sealing of the welded joint.

[0037] In addition, defects such as cold welding and slag inclusion during welding are also common problems. These defects will not only reduce the strength of the welded joints, but may also become potential hazards of refrigerant leakage. Once the refrigerant leaks, it will not only lead to a decline in the performance of the refrigeration system, but may also cause harm to the environment and human health. In view of the above problems, it is particularly important to design a pipe that can stably connect the compressor housing and other components.

[0038] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0039] Embodiment 1 of a copper-iron composite pipe provided by the present invention: like Figures 1 to 4As shown, the pipeline includes a connecting pipe 1, which is located between the compressor and the heat exchanger. The connecting pipe 1 is used to connect the compressor and the heat exchanger. The connecting pipe 1 includes an iron pipe 3 located at one end of the connecting pipe 1. It is defined that the iron pipe 3 is located at the left end of the connecting pipe 1. The diameter of the right side of the iron pipe 3 is larger than the diameter of the left side of the iron pipe 3 to adapt to the heat exchanger and increase the connection strength between the connecting pipe 1 and the heat exchanger; the right side of the iron pipe 3 has a copper pipe 2 connected to the iron pipe 3, and the copper pipe 2 is used to connect the heat exchanger. The iron pipe 3 and the copper pipe 2 are both cold headed to avoid damaging the metal fibers inside the material and improve the mechanical properties of the pipe fittings; the iron pipe 3 and the copper pipe 2 are connected by welding.

[0040] The connecting pipe 1 is configured as a pipe formed by butting the iron pipe 3 and the copper pipe 2 so that the welding of the connecting pipe 1 can be carried out between the same materials, avoiding the occurrence of loose welding due to different melting points between different materials, and reducing the manufacturing cost of the connecting pipe 1 while improving the welding quality.

[0041] In addition, a steel annular flange 5 for connecting to the compressor housing is provided on the left side of the iron pipe 3 and located on the outer peripheral surface of the iron pipe 3. The annular flange 5 and the iron pipe 3 are connected by welding. The left side of the annular flange 5 has a circumferentially extending welding surface 6 that is inclined to the right from the inside to the outside. The setting of the welding surface 6 can increase the welding surface area 6 between the iron pipe 3 and the compressor housing, thereby enhancing the welding strength between the connecting pipe 1 and the compressor.

[0042] The inner wall of the right end of the copper tube 2 has a circumferentially extending chamfer 7 that is inclined rightward from inside to outside, so that the welding wire and flux are evenly distributed at the weld when the connecting tube 1 is welded to the heat exchanger pipeline, thereby improving the welding quality of the connecting tube 1 and the heat exchanger.

[0043] In addition, a plurality of trapezoidal grooves 31 extending left and right are provided on the inner wall of the right end of the iron tube 3, and a plurality of trapezoidal blocks 21 extending left and right and matching with the rectangular grooves are provided on the outer peripheral surface of the left end of the copper tube 2. The trapezoidal grooves 31 and the trapezoidal blocks 21 are mortised with each other. The arrangement of the trapezoidal grooves 31 and the trapezoidal blocks 21 enhances the connection strength between the copper tube 2 and the iron tube 3, and improves the welding quality between the copper tube 2 and the iron tube 3.

[0044] Among them, the right end of the iron tube 3 has a 15° chamfer 8 inclined from the inside to the left, and the left end of the copper tube 2 has a 15° chamfer 8 inclined from the inside to the right, so as to form a V-shaped weld between the copper tube 2 and the iron tube 3, which can effectively improve the welding strength between the copper tube 2 and the iron tube 3.

[0045] Finally, the welding methods between the iron pipe 3 and the copper pipe 2, between the compressor and the annular flange 5, and between the copper pipe 2 and the heat exchanger are all high-frequency welding. The use of high-frequency welding can significantly improve the welding strength and corrosion resistance of the pipeline; the outer peripheral surfaces of the iron pipe 3 and the copper pipe 2 have a protective layer, which is a nickel-plated layer. The nickel-plated layer can effectively prevent the iron pipe 3 and the copper pipe 2 from being oxidized and corroded during use, and at the same time can improve the surface hardness of the connecting pipe 1 and extend the service life of the connecting pipe 1.

[0046] The application principle of the copper-iron composite pipe is as follows: first, by setting the connecting pipe 1 as a composite pipe welded by the iron pipe 3 and the copper pipe 2, the same material can be used for welding between the connecting pipe 1 and the compressor and between the connecting pipe 1 and the heat exchanger, thereby improving the connection strength between the connecting pipe 1 and the compressor and the heat exchanger; in addition, the setting of the trapezoidal groove 31 and the trapezoidal block 21 and the 15° chamfer 8 at the right end of the iron pipe 3 and the left end of the copper pipe 2 can ensure the connection strength between the iron pipe 3 and the copper pipe 2; the setting of the nickel plating layer effectively improves the service life of the connecting pipe 1.

[0047] Embodiment 2 of a copper-iron composite pipe provided by the present invention: The main difference between it and Example 1 is: In Example 1, a trapezoidal groove is provided on the outer peripheral surface of the right end of the iron tube, and a trapezoidal block is provided on the inner wall of the left end of the copper tube.

[0048] In this embodiment, a rectangular groove is provided on the outer peripheral surface of the right end of the iron tube, and a rectangular block is provided on the inner wall of the left end of the copper tube.

[0049] Embodiment 3 of a copper-iron composite pipe provided by the present invention: The main difference between it and Example 1 is: In Example 1, the welding method between the iron pipe and the copper pipe is high frequency welding.

[0050] In this embodiment, the welding method between the iron pipe and the copper pipe is resistance welding.

[0051] Embodiment 4 of a copper-iron composite pipe provided by the present invention: In Example 1, an annular flange for welding connection with the compressor housing is provided on the outer peripheral surface of the iron pipe.

[0052] In this embodiment, an annular flange for welding connection with the compressor shell is provided on the outer peripheral surface of the iron pipe.

[0053] Embodiment 5 of a copper-iron composite pipe provided by the present invention: In Example 1, the protective layer on the outer peripheral surface of the iron pipe and the copper pipe is a nickel plating layer.

[0054] In this embodiment, the protective layer on the outer peripheral surface of the iron pipe and the copper pipe is a paint layer.

[0055] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0056] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A copper-iron composite pipe, comprising a connecting pipe, the connecting pipe is used to connect a compressor and a heat exchanger, characterized in that: One side of the connecting pipe has an iron pipe for connecting to the compressor, and the side where the iron pipe is located is defined as the left side. The right side of the iron pipe is provided with a copper pipe connected to it, and the copper pipe is used to connect to the heat exchanger. The iron pipe and the copper pipe are connected by welding; The inner wall of the right end of the iron pipe is provided with a plurality of trapezoidal grooves extending left and right, and the outer peripheral surface of the left end of the copper pipe is provided with a plurality of trapezoidal blocks extending left and right and matching with the rectangular grooves. The trapezoidal grooves and the trapezoidal blocks are mortised to each other to enhance the connection strength between the copper pipe and the iron pipe.

2. The copper-iron composite pipe according to claim 1, characterized in that: A steel annular flange for connecting to a compressor housing is arranged on the left side of the iron pipe and located on the outer peripheral surface of the iron pipe. The annular flange is connected to the iron pipe by welding.

3. The copper-iron composite pipe according to claim 2, characterized in that: The left side of the annular flange has a circumferentially extending welding surface which is inclined rightward from inside to outside, so as to enhance the welding strength between the annular flange and the compressor housing.

4. The copper-iron composite pipe according to claim 3, characterized in that: The right end of the inner side of the copper tube has a circumferentially extending chamfer inclined rightward from the inside to the outside, so as to improve the welding quality between the copper tube and the heat exchanger.

5. The copper-iron composite pipe according to claim 4, characterized in that: The right end of the iron pipe has a 15° chamfer tilted leftward from inside to outside, and the left end of the copper pipe has a 15° chamfer tilted rightward from inside to outside, so as to improve the welding strength between the copper pipe and the iron pipe during welding.

6. The copper-iron composite pipe according to claim 5, characterized in that: The iron pipe and the copper pipe are both formed by cold heading process.

7. The copper-iron composite pipe according to claim 6, characterized in that: The diameter of the right side of the iron pipe is larger than the diameter of the left side of the iron pipe, so as to adapt to the heat exchanger and increase the connection strength between the connecting pipe and the heat exchanger.

8. The copper-iron composite pipe according to claim 7, characterized in that: The welding methods between the iron pipe and the copper pipe, between the compressor and the annular flange, and between the copper pipe and the heat exchanger are all high-frequency welding.

9. The copper-iron composite pipe according to claim 8, characterized in that: The outer peripheral surfaces of the iron pipe and the copper pipe are both provided with a protective layer to prevent the connecting pipe from being oxidized and corroded in the air.

10. The copper-iron composite pipe according to claim 9, characterized in that: The protective layer is a nickel-plated layer.

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