Stainless steel capillary tube for automotive air conditioning

Abstract

The utility model discloses a stainless steel capillary tube for automobile air conditioner, including the pipe body, the inlet end part of pipe body is equipped with at least two taper different taper sections, and the taper section is arranged in proper order along the fluid flow direction and the through diameter is gradually contracted, and the common constitution multistage taper throttling channel entrance, the taper section end part away from the pipe body is equipped with the connecting section, and the connecting section outer diameter is consistent with the taper section maximum outer diameter, and the connecting section outer surface is the welding cooperation surface, and the adjacent taper section is connected through the arc curved surface, and the taper section close to the pipe body and the pipe body entrance place smooth link, and the taper section close to the connecting section and the connecting section smooth link, and the pipe body includes the protection outer layer, the buffer layer and the throttling inner layer through in multistage taper throttling channel entrance setting taper different taper sections and arc transition curved surface, make refrigerant pressure steady, gradual decrease, effectively restrain turbulence and cavitation phenomenon, reduce vibration and noise greatly, improve system work stability.

Description

Technical Field

[0001] This utility model belongs to the field of capillary technology, and particularly relates to stainless steel capillary tubes for automotive air conditioning. Background Technology

[0002] As a key throttling element in automotive air conditioning systems, the performance of capillary tubes directly affects the cooling efficiency, stability, and reliability of the system. Traditional capillary tube inlets are usually designed with simple conical or straight openings. When the refrigerant flows through, it is easy to generate pressure fluctuations, vibrations, and noise due to severe throttling. Long-term use can easily lead to fatigue damage to the tube body, and the transmission capillary tube has poor vibration resistance. Under the complex operating conditions of automobile driving, frequent vibrations can easily cause the capillary tube and its connection parts to loosen or break. Utility Model Content

[0003] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art, and to provide a stainless steel capillary tube for automotive air conditioning that can effectively suppress vibration and noise, improve welding reliability, and has a composite buffer structure.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The stainless steel capillary tube for automotive air conditioning includes a tube body. The inlet end of the tube body is provided with at least two tapered sections with different tapers. The tapered sections are arranged sequentially along the fluid flow direction and the diameter gradually narrows, forming a multi-stage gradually narrowing throttling channel inlet to achieve a smooth decrease in fluid pressure.

[0006] Furthermore, a connecting section is provided at the end of the tapered section away from the pipe body. The outer diameter of the connecting section is the same as the maximum outer diameter of the tapered section, and the outer surface of the connecting section is a welding mating surface for welding with external equipment joints.

[0007] Furthermore, adjacent conical segments are connected by an arc-shaped curved surface. The conical segment near the pipe body is smoothly connected to the pipe body inlet, and the conical segment near the connecting segment is smoothly connected to the connecting segment, realizing the transition of fluid and avoiding the generation of eddies and noise.

[0008] Furthermore, the pipe body includes, from the outside to the inside, a protective outer layer, a buffer layer, and a throttling inner layer.

[0009] Furthermore, the buffer layer includes a buffer body, and the outside of the buffer body is provided with a support strip arranged along the axial direction of the pipe body. The inner wall of the protective outer layer is provided with a groove, and the support strip is located in the groove, thereby improving the radial compressive strength and connection strength of the pipe body.

[0010] Furthermore, adjacent support bars are connected by elastic elements, which are pressed between the protective outer layer and the buffer layer to absorb and buffer the axial and radial vibrations of the pipe body.

[0011] Furthermore, the inner wall of the throttling inner layer is provided with a spiral guide groove, which is used to guide the fluid flow and reduce the flow resistance.

[0012] Furthermore, the outer surface of the protective layer is also equipped with anti-slip textures.

[0013] Furthermore, the buffer layer, the outer protective layer, and the throttling inner layer are all integrally molded.

[0014] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0015] 1. In this utility model, by setting conical sections with different tapers and arc transition surfaces at the inlet of the multi-stage gradually narrowing throttling channel, the refrigerant pressure is made stable and gradually decreases, effectively suppressing turbulence and cavitation, significantly reducing vibration and noise, and improving the system's working stability.

[0016] 2. In this utility model, by setting the outer diameter of the connecting section to be consistent with the maximum outer diameter of the tapered section, and the outer surface of the connecting section to be a welding mating surface, the rapid and accurate alignment and welding reliability of the interface with external equipment are ensured.

[0017] 3. In this utility model, the pipe body adopts a composite structure of stainless steel protective outer layer, polymer buffer layer and special material throttling inner layer. While ensuring mechanical strength and corrosion resistance, it also has excellent vibration reduction and impact resistance and fluid guiding function, which significantly extends the service life. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 This is a cross-sectional schematic diagram of the stainless steel capillary tube for automotive air conditioning in this utility model.

[0020] Figure 2 This is a front view cross-sectional structural diagram of the tube body of this utility model;

[0021] Figure 3 This is a side view cross-sectional structural diagram of the tube body of this utility model;

[0022] Figure 4 for Figure 1 Enlarged schematic diagram of a local structure at point A;

[0023] Figure 5 for Figure 3 Enlarged schematic diagram of the local structure at point B.

[0024] In the figure: 1-pipe body; 2-conical section; 3-connecting section; 4-arc curved surface; 5-protective outer layer; 6-buffer layer; 61-buffer body; 62-support bar; 7-throttling inner layer; 8-groove; 9-elastic element; 10-spiral guide groove; 11-anti-slip texture. Detailed Implementation

[0025] like Figures 1 to 5 As shown, this utility model is a stainless steel capillary tube for automotive air conditioning, which includes a tube body 1.

[0026] The inlet end of the capillary tube 1 is precision-machined to form a unique composite structure. Two tapered sections 2 with different tapers are provided at the inlet end of the tube 1. The tapered sections 2 are arranged sequentially along the flow direction of the fluid, and the diameter of the tapered sections 2 shows a gradually narrowing shape. Together, they form a multi-stage gradually narrowing throttling channel inlet, which allows the pressure of the refrigerant flowing through to decrease steadily and gradually, thereby effectively avoiding flow fluctuations, vibrations and noise that may be caused by single-point drastic throttling.

[0027] Adjacent conical segments 2 are connected by an arc-shaped curved surface 4. The arc-shaped curved surface 4 ensures the change of streamline shape, so that the last conical segment 2 near the main body of the tube 1 is smoothly connected to the inlet hole of the tube 1. The primary conical segment 2 near the outside is connected to the connecting segment 3. Similarly, the conical segment 2 and the connecting segment 3 are also smoothly connected here, which greatly suppresses the generation of eddies, improves flow efficiency and reduces operating noise.

[0028] The connecting section 3 is a hollow cylindrical structure, and the inner and outer diameters of the connecting section 3 are consistent with the maximum inner and outer diameters of the tapered section 2, respectively. The outer surface of the connecting section 3 is set as a welding mating surface. Its function is to ensure that when welding with the joint of external equipment (such as a distributor), it can achieve rapid and accurate alignment and provide a uniform and sufficient material contact area, thereby forming a ring weld with excellent sealing performance and high mechanical strength, reducing the risk of leakage caused by misalignment or welding defects, and improving the reliability of the system connection.

[0029] To further improve the overall performance of the pipe body 1, the pipe body 1 adopts a composite layer structure, consisting of a protective outer layer 5, a buffer layer 6, and a throttling inner layer 7 from the outside to the inside.

[0030] The outer protective layer 5 is made of stainless steel, which improves the mechanical strength, wear resistance and corrosion resistance of the tube body 1. It can effectively resist the erosion of harsh factors such as mud, water, salt spray and gravel impact in the automotive chassis environment and extend the service life of the product.

[0031] The buffer layer 6 includes a core buffer body 61. The buffer body 61 is provided with several support bars 62 extending along the axial direction of the tube body 1. The number of support bars 62 can be set according to actual requirements. In this embodiment, there are four support bars 62. The inner wall of the protective outer layer 5 is pre-processed with axial grooves 8 that match the shape of the support bars 62. The support bars 62 are precisely embedded in these grooves 8. The above-mentioned arrangement significantly improves the radial compressive strength and structural connection strength of the tube body 1.

[0032] The buffer 61 can be made of TPU material, which has the characteristics of high toughness, high elasticity and impact resistance.

[0033] Between adjacent support bars 62, special elastic elements 9 are provided. The elastic elements 9 are pressed and housed in the space formed by the protective outer layer 5 and the buffer layer 6. When the tube body 1 is subjected to vibration and impact from different directions, these elastic elements 9 can deform, thereby effectively absorbing and buffering the axial and radial vibration energy of the tube body 1.

[0034] The elastic element 9 can be made of silicone rubber, which has excellent resilience, fatigue resistance, and high and low temperature resistance.

[0035] The inner wall of the throttling inner layer 7 is machined with continuous spiral guide grooves 10, which are used to guide the fluid, reduce the fluid flow resistance, and promote the stability of the flow.

[0036] The elastic element 9 can be made of PTFE material, which has the characteristics of self-lubrication and resistance to high and low temperatures.

[0037] The outer surface of the protective outer layer 5 is also provided with anti-slip texture 11 to enhance the grip stability of the tool during installation and maintenance and prevent slippage.

[0038] To achieve the highest structural reliability and production consistency, the capillary's buffer layer 6, protective outer layer 5, and throttling inner layer 7 are integrally molded to ensure the product's long-term durability in harsh automotive air conditioning environments.

[0039] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A stainless steel capillary tube for automotive air conditioning, comprising a tube body, characterized in that: The inlet end of the pipe body is provided with at least two tapered sections with different tapers. The tapered sections are arranged sequentially along the fluid flow direction and their diameters gradually decrease, together forming a multi-stage gradually narrowing throttling channel inlet, so as to achieve a smooth decrease in fluid pressure.

2. The stainless steel capillary tube for automotive air conditioning according to claim 1, characterized in that: A connecting section is provided at the end of the tapered section away from the tube body. The outer diameter of the connecting section is the same as the maximum outer diameter of the tapered section. The outer surface of the connecting section is a welding mating surface for welding with external equipment joints.

3. The stainless steel capillary tube for automotive air conditioning according to claim 2, characterized in that: Adjacent conical segments are connected by an arc-shaped curved surface. The conical segment near the pipe body is smoothly connected to the pipe body inlet, and the conical segment near the connecting segment is smoothly connected to the connecting segment, so as to realize the fluid transition and avoid the generation of eddies and noise.

4. The stainless steel capillary tube for automotive air conditioning according to claim 1, characterized in that: The tube body comprises, from the outside in, a protective outer layer, a buffer layer, and a throttling inner layer.

5. The stainless steel capillary tube for automotive air conditioning according to claim 4, characterized in that: The buffer layer includes a buffer body, and the buffer body is provided with a support strip arranged along the axial direction of the pipe body. The inner wall of the protective outer layer is provided with a groove, and the support strip is located in the groove, thereby improving the radial compressive strength and connection strength of the pipe body.

6. The stainless steel capillary tube for automotive air conditioning according to claim 5, characterized in that: The adjacent support bars are connected by an elastic element, which is pressed between the protective outer layer and the buffer layer to absorb and buffer the axial and radial vibrations of the tube body.

7. The stainless steel capillary tube for automotive air conditioning according to claim 4, characterized in that: The inner wall of the throttling inner layer is provided with a spiral guide groove, which is used to guide the fluid flow and reduce the flow resistance.

8. The stainless steel capillary tube for automotive air conditioning according to claim 4, characterized in that: The outer surface of the protective outer layer is also provided with anti-slip texture.

9. The stainless steel capillary tube for automotive air conditioning according to claim 4, characterized in that: The buffer layer, the protective outer layer, and the throttling inner layer are all integrally molded.

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