A type of capillary straight tube

Abstract

This utility model discloses a capillary tube, including a capillary tube body with a cavity. The capillary tube body comprises a first tube body and a second tube body. The first tube body includes a connecting tube segment one and a connecting tube segment two, both integrally formed, and both connecting tube segment one and connecting tube segment two are cylindrical, with the diameter of connecting tube segment one being larger than the diameter of connecting tube segment two. The second tube body includes a connecting tube segment three and a connecting tube segment four, both integrally formed, and both connecting tube segment three and connecting tube segment four are cylindrical, with the diameter of connecting tube segment three being larger than the diameter of connecting tube segment four, and the diameter of connecting tube segment three being the same as the diameter of connecting tube segment two. An inclined portion is fixed to the end of connecting tube segment three, the diameter of which gradually increases along the direction from connecting tube segment two to connecting tube segment three. The inclined portion and the end of connecting tube segment two form a groove, and solder is provided in the groove to weld and fix the inclined portion and the end of connecting tube segment two.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration system technology, and specifically relates to a capillary straight tube. Background Technology

[0002] The general principle of a refrigeration machine is that the compressor compresses low-pressure vapor into high-pressure vapor, reducing the volume of the vapor and increasing its pressure. The compressor draws in low-pressure working fluid vapor from the evaporator, increases its pressure, and sends it to the condenser. In the condenser, it condenses into a high-pressure liquid. After being throttled by the expansion valve, it becomes a low-pressure liquid and is sent to the evaporator. In the evaporator, it absorbs heat and evaporates into low-pressure vapor, which is then sent back to the compressor inlet, thus completing the refrigeration cycle.

[0003] A capillary tube is a connecting pipe used in refrigeration systems. Its function is to provide a flow channel for the refrigerant to reduce pressure and temperature, allowing the refrigerant to absorb heat from the air and cool down through the effect of temperature difference.

[0004] In existing technologies, the pressure drop generated by the refrigerant passing through a capillary tube varies with the capillary tube's length, inner diameter, and inner wall roughness; the longer the capillary tube, the smaller the inner diameter, and the rougher the inner wall, the greater the pressure drop. Therefore, existing technologies require capillary tube diameter reduction. When two diameter reductions are required for the capillary tube, the intermediate section is quite long, making the diameter reduction machining difficult. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned technical problems existing in the prior art, and to provide a capillary straight tube that can produce two diameter changes to meet the pressure drop changes. Moreover, it is processed by welding in two sections, and the welding quality of each section is controlled separately during manufacturing to improve the quality of diameter change.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A capillary tube includes a capillary body with a cavity. The capillary body comprises a first tube body and a second tube body. The first tube body includes a first connecting tube segment and a second connecting tube segment, both integrally formed, and both are cylindrical. The diameter of the first connecting tube segment is larger than the diameter of the second connecting tube segment. The second tube body includes a third connecting tube segment and a fourth connecting tube segment, both integrally formed, and both are cylindrical. The diameter of the third connecting tube segment is larger than the diameter of the fourth connecting tube segment, and the diameter of the third connecting tube segment is the same as the diameter of the second connecting tube segment. An inclined portion is fixed to the end of the third connecting tube segment. The diameter of the inclined portion gradually increases from the second connecting tube segment to the third connecting tube segment. The inclined portion and the end of the second connecting tube segment form a groove, and solder is provided in the groove to weld and fix the inclined portion and the end of the second connecting tube segment.

[0008] Furthermore, a guide section 1 is provided between connecting pipe section 1 and connecting pipe section 2. The diameter of guide section 1 gradually decreases from connecting pipe section 1 to connecting pipe section 2 to meet the diameter change requirements of the first pipe body.

[0009] Furthermore, connecting pipe section one, connecting pipe section two, and guide section one are integrally formed structures.

[0010] Furthermore, a guide section 2 is provided between connecting pipe section 3 and connecting pipe section 4. The diameter of the guide section 2 gradually decreases from connecting pipe section 3 to connecting pipe section 4 to meet the diameter change requirements of the second pipe body.

[0011] Furthermore, connecting pipe section three, connecting pipe section four, and guide section two are integrally formed structures.

[0012] Furthermore, during welding, the first pipe body needs to be limited, but it is relatively thin. To address this technical problem, this invention adds a sleeve to the first pipe body. The sleeve has a through hole running from front to back, and the second connecting pipe section has a groove. The second connecting pipe section passes through the through hole, allowing the sleeve to be placed in the groove. The outer diameter of the sleeve is larger than the outer diameter of the second connecting pipe section, increasing the thickness of the second connecting pipe section and improving the strength of the first pipe body, thus facilitating the limitation of the first pipe body. Both ends of the sleeve have openings, the diameter of which is larger than the diameter of the through hole. Solder is placed in the space between one of the openings and the second connecting pipe section, allowing the sleeve and the second connecting pipe section to be welded and fixed. Solder is also placed in the space between the inclined portion, the second connecting pipe section, and the other opening, allowing the sleeve, the inclined portion, and the end of the second connecting pipe section to be welded and fixed. This increases the space for solder filling and improves the weld's strength.

[0013] Furthermore, the outer surface of the sleeve is provided with a limiting groove, which has an anti-slip effect and facilitates the application of force to the sleeve, so that the sleeve and the connecting pipe section can be quickly welded and fixed.

[0014] Furthermore, the outer sides of both the front and rear ends of the sleeve are provided with arc surfaces to increase the cross-section of the front and rear ends of the sleeve and prevent the sleeve from falling off during welding.

[0015] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0016] This invention divides the capillary tube into two sections, a first section and a second section. The first section undergoes a diameter reduction process, and the second section undergoes a diameter reduction process separately. The quality of each diameter reduction is controlled independently, ensuring that the diameter of connecting section one is larger than that of connecting section two, the diameter of connecting section three is larger than that of connecting section four, and the diameter of connecting section three is the same as that of connecting section two. This allows for two diameter reductions in the capillary tube, satisfying the pressure drop variation. Furthermore, a groove is formed at the end of the inclined section and the second section, and solder is placed in the groove to weld and fix the inclined section and the end of the second section. The welding process is carried out in two sections, and the welding quality of each section is controlled separately during manufacturing, improving the overall quality of the diameter reduction. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the second tube in Embodiment 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the first tube in Embodiment 1 of this utility model;

[0021] Figure 4 This is a cross-sectional view of Embodiment 1 of the present utility model;

[0022] Figure 5 This is a schematic diagram of the structure in Embodiment 1 of this utility model where the inclined part and the end of the connecting pipe section 2 form a groove;

[0023] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0024] Figure 7 This is a schematic diagram of the sleeve structure in Embodiment 2 of this utility model;

[0025] Figure 8 This is a cross-sectional view of Embodiment 2 of the present invention;

[0026] Figure 9 This is a cross-sectional view of the first tube in Embodiment 2 of this utility model;

[0027] Figure 10 This is a cross-sectional view of the sleeve in Embodiment 2 of this utility model;

[0028] Figure 11 for Figure 10 A magnified schematic diagram of the structure at point A in the middle.

[0029] In the figure, 1-first pipe body; 2-second pipe body; 3-connecting pipe section one; 4-connecting pipe section two; 5-connecting pipe section three; 6-connecting pipe section four; 7-guide section one; 8-guide section two; 9-inclined part; 10-groove; 11-sleeve; 12-limiting groove; 13-arc surface; 14-opening; 15-through hole; 16-groove. Detailed Implementation

[0030] like Figures 1 to 5 The image shown is an embodiment of this utility model.

[0031] A capillary tube includes a capillary body with a cavity. The capillary body comprises a first tube body 1 and a second tube body 2. The first tube body 1 includes a connecting tube segment 3 and a connecting tube segment 4, both integrally formed. Both connecting tube segment 3 and connecting tube segment 4 are cylindrical, with the diameter of connecting tube segment 3 being larger than the diameter of connecting tube segment 4. A guide segment 7 is provided between connecting tube segment 3 and connecting tube segment 4. Connecting tube segment 3, connecting tube segment 4, and guide segment 7 are integrally formed. The diameter of guide segment 7 gradually decreases from connecting tube segment 3 to connecting tube segment 4, satisfying the diameter variation requirement of the first tube body 1.

[0032] The second pipe body 2 includes a three-section pipe 5 and a four-section pipe 6, both integrally formed. The three-section pipe 5 and the four-section pipe 6 are cylindrical, with the diameter of the three-section pipe 5 being larger than that of the four-section pipe 6. The diameter of the three-section pipe 5 is the same as that of the two-section pipe 4. A guide section 2 8 is provided between the three-section pipe 5 and the four-section pipe 6. The three-section pipe 5, the four-section pipe 6, and the guide section 2 8 are integrally formed. The diameter of the guide section 2 8 gradually decreases from the three-section pipe 5 to the four-section pipe 6, satisfying the diameter variation requirement of the second pipe body 2.

[0033] An inclined portion 9 is fixed to the end of the connecting pipe section 3 5. The diameter of the inclined portion 9 gradually increases along the direction from the connecting pipe section 2 4 to the connecting pipe section 3 5. The inclined portion 9 and the end of the connecting pipe section 2 4 form a groove 10. Welding material is provided in the groove 10 so that the inclined portion 9 and the end of the connecting pipe section 2 4 are welded and fixed.

[0034] like Figures 6 to 11 The image shown is a second embodiment of this utility model.

[0035] During welding, the first tube body 1 needs to be limited, but the first tube body 1 is relatively thin and lacks strength. To address this technical problem, based on the structure of Embodiment 1, this utility model adds a sleeve 11 to the first tube body 1. The sleeve 11 has a through hole 15 extending from front to back, and the connecting tube segment 4 has a groove 16. The connecting tube segment 4 passes through the through hole 15, so that the sleeve 11 is placed in the groove 16. The outer diameter of the sleeve 11 is larger than the outer diameter of the connecting tube segment 4, which increases the thickness of the connecting tube segment 4, improves the strength of the first tube body 1, and facilitates the limitation of the first tube body 1. Both the front and rear ends of the sleeve 11 have openings 14, the diameter of which is larger than the diameter of the through hole 15. One of the openings 14 and the space between the connecting tube segment 4 is filled with solder, so that the sleeve 11 and the connecting tube segment 4 are welded and fixed. Another space between the inclined part 9, the connecting tube segment 4, and the other opening 14 is filled with solder, so that the ends of the sleeve 11, the inclined part 9, and the connecting tube segment 4 are welded and fixed. It can increase the space for solder to fill, thus improving the strength of the weld.

[0036] The outer surface of the sleeve 11 is provided with a limiting groove 12, which has an anti-slip effect and facilitates the application of force to the sleeve 11, so that the sleeve 11 and the connecting pipe section 4 can be quickly welded and fixed. The outer sides of both the front and rear ends of the sleeve 11 are provided with arc surfaces 13, which increases the cross-section of the front and rear ends of the sleeve 11 and prevents the sleeve 11 from falling off during welding.

[0037] 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 capillary tube, comprising a capillary tube body having a cavity; characterized in that The capillary tube body comprises a first tube body and a second tube body. The first pipe body includes a first connecting pipe section and a second connecting pipe section, both of which are integrally formed. The first connecting pipe section and the second connecting pipe section are both cylindrical in shape, and the diameter of the first connecting pipe section is larger than the diameter of the second connecting pipe section. The second pipe body includes a connecting pipe section three and a connecting pipe section four, which are integrally formed. The connecting pipe section three and the connecting pipe section four are cylindrical. The diameter of the connecting pipe section three is larger than the diameter of the connecting pipe section four. The diameter of the connecting pipe section three is the same as the diameter of the connecting pipe section two. An inclined portion is fixed at the end of the connecting pipe section three. The diameter of the inclined portion gradually increases along the direction from the connecting pipe section two to the connecting pipe section three. The inclined portion and the end of the connecting pipe section two form a groove. Solder is provided in the groove so that the inclined portion and the end of the connecting pipe section two are welded and fixed.

2. A capillary tube according to claim 1, characterized in that: A guide section is provided between the first connecting pipe section and the second connecting pipe section, and the diameter of the guide section gradually decreases from the first connecting pipe section to the second connecting pipe section.

3. A capillary straight tube according to claim 2, characterized in that: The first connecting pipe section, the second connecting pipe section, and the first guide section are integrally formed.

4. A capillary straight tube according to claim 1, characterized by: A guide section 2 is provided between the connecting pipe section 3 and the connecting pipe section 4, and the diameter of the guide section 2 gradually decreases from the connecting pipe section 3 to the connecting pipe section 4.

5. A capillary straight tube according to claim 4, characterized in that: The connecting pipe section three, the connecting pipe section four, and the guide section two are integrally formed structures.

6. A capillary straight tube according to claim 1, characterized by: The first tube body is provided with a sleeve, the sleeve having a through hole running through the front and rear. The second connecting tube section has a groove, and the second connecting tube section passes through the through hole, so that the sleeve is placed in the groove. The outer diameter of the sleeve is larger than the outer diameter of the second connecting tube section. Both ends of the sleeve are provided with openings, the diameter of which is larger than the diameter of the through hole. One of the openings and the space between the second connecting tube section is provided with solder, so that the sleeve and the second connecting tube section are welded and fixed. Another space between the inclined portion, the second connecting tube section and the other opening is provided with solder, so that the ends of the sleeve, the inclined portion and the second connecting tube section are welded and fixed.

7. A capillary straight tube according to claim 6, characterized in that: The outer surface of the sleeve is provided with a limiting groove.

8. A capillary tube according to claim 6, characterized in that: The outer sides of both the front and rear ends of the sleeve are provided with arc surfaces.

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