Connecting pipe sealing device and air conditioner

Abstract

The invention provides a connecting pipe sealing device and an air conditioner. The connecting pipe sealing device comprises a connecting pipe with a flaring section at one end; the connecting valve is in butt joint communication with the connecting pipe, a first inclined plane matched with the flaring section is arranged at the end, communicated with the connecting pipe, of the connecting valve, and the first inclined plane is arranged on the inner side of the flaring section in a sleeving mode; the first sealing gasket is arranged between the first inclined surface and the flaring section in a sleeving manner; the connecting nut comprises a threaded section and a limiting section connected with the threaded section, the limiting section is arranged on the outer side of the connecting pipe in a sleeving mode and provided with a second inclined face matched with the flaring section, the first inclined face, the flaring section and the second inclined face are all arranged to be in a circular truncated cone shape, and the second inclined face is arranged on the outer side of the flaring section in a sleeving mode to limit the connecting pipe to move in the direction away from the connecting valve; the threaded section sleeves the outer side of the connecting valve and is in threaded connection with the connecting valve; and the second sealing gasket is arranged between the second inclined surface and the flaring section in a sleeving manner so as to seal a gap between the second inclined surface and the flaring section. The scheme can improve the sealing reliability of the air conditioner indoor and outdoor unit connecting pipe.

Description

Technical Field

[0001] The present application relates to, but is not limited to, the field of air conditioner technology, and specifically refers to a connecting pipe sealing device and an air conditioner. Background Art

[0002] In the related art, the connecting pipe between the indoor and outdoor units of an air conditioner is a TP2 (phosphorus-deoxidized copper) copper pipe, and a gas / liquid valve is used for sealed connection. The sealed connection method is as follows: Open the connection nut threadedly connected to the gas / liquid valve, align the flared portion (i.e., the flared section) of the TP2 connecting pipe with the center of the gas / liquid valve, and use a torque wrench to lock the nut of the gas / liquid valve. Under the action of the standard sealing torque, the flared portion of the TP2 connecting pipe undergoes plastic deformation to fill the gap of the conical interface of the gas / liquid valve, thus completing the sealed connection. However, this sealed connection method has poor reliability, is prone to refrigerant leakage, and as the service life of the air conditioner increases, the leakage risk becomes greater, resulting in continuous decline in the energy efficiency of the air conditioner. Summary of the Invention

[0003] The technical problem to be solved by the present application is to provide a connecting pipe sealing device, which can solve the problems of poor sealing reliability of the connecting pipe between the indoor and outdoor units of an air conditioner and easy refrigerant leakage resulting in continuous decline in the energy efficiency of the air conditioner.

[0004] An embodiment of the present application provides a connecting pipe sealing device, including: a connecting pipe, one end of which is provided with a flared section; a connecting valve, connected and communicated with the connecting pipe, and a first inclined surface adapted to the flared section is provided at one end of the connecting valve communicating with the connecting pipe, and the first inclined surface is sleeved inside the flared section; a first sealing gasket, sleeved between the first inclined surface and the flared section to seal the gap between the first inclined surface and the flared section; a connecting nut, including a threaded section and a limiting section connected to the threaded section, the limiting section is sleeved outside the connecting pipe and is provided with a second inclined surface adapted to the flared section, the first inclined surface, the flared section, and the second inclined surface are all provided in a frustum shape, the second inclined surface is sleeved outside the flared section to limit the movement of the connecting pipe in a direction away from the connecting valve; the threaded section is sleeved outside the connecting valve and is threadedly connected to the connecting valve; and a second sealing gasket, sleeved between the second inclined surface and the flared section to seal the gap between the second inclined surface and the flared section.

[0005] Compared with the related technologies, in the embodiments of the present application, a first gasket is additionally provided between the connecting valve and the connecting pipe, and a second gasket is additionally provided between the connecting pipe and the connecting nut. The plastic deformation of the first gasket and the second gasket is used to fill the gap of the conical interface of the connecting valve (i.e., the gap between the first inclined surface and the second inclined surface), realizing the superposition of double seals. Compared with the single-seal solution that only relies on the plastic deformation of the flared section to fill the gap of the conical interface of the connecting valve, this solution is beneficial to improving the sealing reliability of the connecting pipe, and thus is beneficial to reducing the probability of continuous decline in the energy efficiency of the air conditioner due to refrigerant leakage. Moreover, when the refrigerant leaks from the air conditioner connecting pipe, only the first gasket and / or the second gasket need to be replaced, without replacing the connecting pipe, so the maintenance operation is simple and the maintenance cost is low.

[0006] On the basis of the above technical solutions, the present application can also be improved as follows.

[0007] In an exemplary embodiment, the material of the first gasket is any one of copper, aluminum, and magnesium; the material of the second gasket is any one of copper, aluminum, and magnesium.

[0008] In an exemplary embodiment, rare earth element Sm is added to the first gasket and / or the second gasket.

[0009] In an exemplary embodiment, the content of the rare earth element Sm is in the range of 5 ppm to 200 ppm.

[0010] In an exemplary embodiment, the material of the connecting pipe is TU0 pipe.

[0011] In an exemplary embodiment, the surface roughness Ra of the first gasket ≤ 3.2; and / or, the surface roughness Ra of the second gasket ≤ 3.2.

[0012] In an exemplary embodiment, the thickness of the first gasket is 1 / 5 to 2 / 1 of the thickness of the flared section; and / or, the thickness of the second gasket is 1 / 5 to 2 / 1 of the thickness of the flared section.

[0013] In an exemplary embodiment, the bus length of the first gasket ≥ 1 / 2 of the bus length of the first inclined surface; and / or, the bus length of the second gasket ≥ 1 / 2 of the bus length of the second inclined surface.

[0014] In an exemplary embodiment, the bus length of the flared section ≥ 75% of the bus length of the first inclined surface.

[0015] In an exemplary embodiment, the first inclined surface is parallel to the second inclined surface, and the difference between the slope of the first gasket and the slope of the first inclined surface is within the range of ±2°, and the difference between the slope of the second gasket and the slope of the first inclined surface is within the range of ±2°.

[0016] An embodiment of the present application also provides an air conditioner, including the connecting pipe sealing device as described in any one of the above embodiments. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the connecting pipe sealing device provided by some embodiments of the present application;

[0018] Figure 2 It is a schematic structural diagram of the first seal or the second gasket or the flared section provided by some embodiments of the present application;

[0019] Figure 3 It is a metallographic diagram of the connecting pipe provided by some embodiments of the present application;

[0020] Figure 4 It is a metallographic diagram of the connecting pipe provided by other embodiments of the present application;

[0021] Figure 5 It is a comparison diagram of the simulated thickness of the connecting pipes provided by some embodiments and other embodiments of the present application.

[0022] In the drawings, the list of components represented by each reference numeral is as follows:

[0023] 1 connecting valve, 11 first inclined surface, 2 connecting nut, 21 second inclined surface, 3 connecting pipe, 31 flared section, 4 first gasket, 5 second gasket. Detailed Embodiments

[0024] The principles and features of the present application will be described below with reference to the accompanying drawings. The examples given are only for explaining the present application and are not intended to limit the scope of the present application.

[0025] It is found through research that the reason for the poor reliability of the sealing connection method of the connecting pipe in the related art is as follows: during the preparation process of the connecting pipe, after the straightening-flaring process, continuous work hardening occurs at the flared part of the connecting pipe during the straightening-flaring process, and the plasticity continuously decreases. Under the action of the nut torque of the locking gas / liquid valve, the metal plastic fluidity at the flared part is poor, resulting in an increase in the sealing difficulty; moreover, there is a problem of poor roundness in the preparation of the connecting pipe flared mouth by stamping or spinning processes, which also increases the sealing difficulty. As the air conditioner operates, the vibration generated by the outdoor unit and the thermal expansion and contraction caused by the change in the ambient temperature will cause tiny gaps at the seal, resulting in refrigerant leakage.

[0026] For this reason, as Figure 1As shown in the figure, an embodiment of the present application provides a sealing device for a connecting pipe 3, which includes: a connecting pipe 3, a connecting valve 1, a first gasket 4, a connecting nut 2, and a second gasket 5. The connecting pipe 3 can be the connecting pipe 3 between the indoor and outdoor units of an air conditioner. The connecting valve 1 can be the gas / liquid valve of the air conditioner. The connecting nut 2 is a nut that matches the gas / liquid valve.

[0027] Wherein, one end of the connecting pipe 3 is provided with a flared section 31. The flared section 31 is used for cooperating with the connecting valve 1 and the connecting nut 2.

[0028] The connecting valve 1 is butted and communicated with the connecting pipe 3, and a first inclined surface 11 adapted to the flared section 31 is provided at one end of the connecting valve 1 communicating with the connecting pipe 3. The first inclined surface 11 is sleeved inside the flared section 31. In other words, the outer surface of one end of the connecting valve 1 close to the connecting pipe 3 is provided with a tapered first inclined surface 11, and the first inclined surface 11 can play a guiding role to facilitate the port part of the connecting valve 1 to be quickly and smoothly inserted into the connecting pipe 3. The connecting valve 1 is provided with an external thread for threaded connection with the connecting nut 2 to achieve locking.

[0029] The first gasket 4 is sleeved between the first inclined surface 11 and the flared section 31 to seal the gap between the first inclined surface 11 and the flared section 31.

[0030] The connecting nut 2 includes a threaded section and a limiting section connected to the threaded section. The limiting section is sleeved outside the connecting pipe 3 and is provided with a second inclined surface 21 adapted to the flared section 31. The first inclined surface 11, the flared section 31, and the second inclined surface 21 are all arranged in a frustum shape. The second inclined surface 21 is sleeved outside the flared section 31 to limit the movement of the connecting pipe 3 in the direction away from the connecting valve 1. The threaded section is sleeved outside the connecting valve 1 and is threadedly connected to the connecting valve 1.

[0031] The second gasket 5 is sleeved between the second inclined surface 21 and the flared section 31 to seal the gap between the second inclined surface 21 and the flared section 31.

[0032] The sealing connection method of the sealing device of the connecting pipe 3 can be as follows: Install the second gasket 5 into the limiting section of the connecting nut 2 and closely adhere to the second inclined surface 21 of the limiting section; then, after passing the connecting pipe 3 through the connecting nut 2, perform a flaring process so that one end of the connecting pipe 3 close to the connecting valve 1 forms a flared section 31 (the slope can be 40° to 50°, such as 45°, 45±3°), and the outer wall surface of the flared section 31 closely adheres to the second gasket 5; place the first gasket 4 in the flared section 31 so that the first gasket 4 closely adheres to the inner wall surface of the flared section 31; then align the center of the connecting pipe 3 with the center of the corresponding port of the connecting valve 1, and use a torque wrench to lock the connecting nut 2 and the connecting valve 1 according to the standard sealing torque. During the locking process, the first gasket 4 and the second gasket 5 will undergo plastic deformation to quickly fill the gap between the first inclined surface 11 and the flared section 31 and the gap between the second inclined surface 21 and the flared section 31, realizing the sealing of the connecting pipe 3 between the indoor and outdoor units of the air conditioner.

[0033] Compared with the related technology, in the embodiment of the present application, a first gasket 4 is added between the connecting valve 1 and the connecting pipe 3, and a second gasket 5 is added between the connecting pipe 3 and the connecting nut 2. The plastic deformation of the first gasket 4 and the second gasket 5 is used to fill the gap of the conical interface of the connecting valve 1 (i.e., the gap between the first inclined surface 11 and the second inclined surface 21), realizing the superposition of double sealing. Compared with the single-sealing scheme that only relies on the plastic deformation of the flared section 31 to fill the gap of the conical interface of the connecting valve 1, this scheme is beneficial to improving the sealing reliability of the connecting pipe 3, and thus is beneficial to reducing the probability of the air conditioner's energy efficiency continuously decreasing due to refrigerant leakage. And when the refrigerant leaks from the connecting pipe 3 of the air conditioner, only the first gasket 4 and / or the second gasket 5 need to be replaced, without replacing the connecting pipe 3, so the maintenance operation is simple and the maintenance cost is low.

[0034] Among them, the mechanical indexes of the first gasket 4 and the second gasket 5 need to meet the following conditions:

[0035] 1) Under the action of the standard sealing torque, the first gasket 4 and the second gasket 5 need to undergo plastic deformation but not break. Therefore, the tensile strength σb of the first gasket 4 and the second gasket 5 > F / S, where F is the normal pressure acting on the first gasket 4 and the second gasket 5 under the standard sealing torque, and S is the acting surface area.

[0036] 2) Under the action of the standard sealing torque, since the sealing is mainly achieved by the plastic deformation of the first gasket 4 and the second gasket 5 to fill the gap, the plastic elongation rate of the first gasket 4 and the second gasket 5 should be better than that of the material of the connecting pipe 3. That is: the plastic elongation rate of the first gasket 4 > the plastic elongation rate of TP2, and the plastic elongation rate of the second gasket 5 > the plastic elongation rate of TP2.

[0037] In some embodiments, the material of the first gasket 4 is any one of copper, aluminum, and magnesium, and the material of the second gasket 5 is any one of copper, aluminum, and magnesium. Copper, aluminum, and magnesium are all materials with excellent plasticity and can meet the above requirements.

[0038] In some exemplary embodiments, rare earth element Sm (samarium) is added to the first gasket 4 and the second gasket 5. The content of rare earth element Sm is in the range of 5 ppm to 200 ppm.

[0039] Adding rare earth element Sm (samarium) in the above content is beneficial to further improve the thermoplasticity of the first gasket 4 and the second gasket 5, thereby being beneficial to further improve the sealing reliability of the connecting pipe 3.

[0040] In some exemplary embodiments, the material of the connecting pipe 3 is a TU0 (phosphorus-deoxidized copper) pipe.

[0041] Compared with the TP2 connecting pipe 3, the TU0 connecting pipe 3 has higher plasticity and more uniform deformation. Therefore, it is beneficial to further improve the sealing reliability of the connecting pipe 3 and meets the pressure resistance requirements of the air-conditioning system, and can be used in air conditioners.

[0042] The outer diameter of the connecting pipe 3 can be 6 mm to 12 mm, the wall thickness can be 0.5 to 0.7 mm, and the specifications of the connecting pipe 3 can include: outer diameter * wall thickness: Φ6 mm * 0.5 mm, Φ9 mm * 0.6 mm, Φ12 mm * 0.7 mm, etc.

[0043] Of course, the material of the connecting pipe 3 can also be made of TP2 material.

[0044] In some exemplary embodiments, the roughness Ra of the first gasket 4 is ≤ 3.2 (μm), such as 0.8, 1.6, 3.2, etc. The roughness Ra of the second gasket 5 is ≤ 3.2 (μm), such as 0.8, 1.6, 3.2, etc.

[0045] Verified by experiments, the roughness of the first gasket 4 and the second gasket 5 meeting the above requirements is beneficial to improving the sealing reliability of the connecting pipe 3.

[0046] In some exemplary embodiments, the thickness of the first gasket 4 is 1 / 5 to 2 / 1 of the thickness of the flared section 31, such as 1 / 5, 1 / 4, 1 / 3, 1 / 2, etc. The thickness of the second gasket 5 is 1 / 5 to 2 / 1 of the thickness of the flared section 31, such as 1 / 5, 1 / 4, 1 / 3, 1 / 2, etc. The thickness of the first gasket 4, the thickness of the second gasket 5, and the thickness of the flared section 31 refer to Figure 2 the dimension indicated by h in

[0047] Verified by experiments, the thickness of the first gasket 4 and the second gasket 5 meeting the above requirements is beneficial to improving the sealing reliability of the connecting pipe 3.

[0048] In some exemplary embodiments, the bus length of the first gasket 4 is ≥ 1 / 2 of the bus length of the first inclined surface 11, such as 1 / 2, 3 / 4, 1, etc. The bus length of the second gasket 5 is ≥ 1 / 2 of the bus length of the second inclined surface 21, such as 1 / 2, 3 / 4, 1, etc. The bus lengths of the first gasket 4 and the second gasket 5 refer to Figure 2 the dimension indicated by l in

[0049] Verified by experiments, the bus lengths of the first gasket 4 and the second gasket 5 meeting the above requirements are beneficial to improving the sealing reliability of the connecting pipe 3.

[0050] In some exemplary embodiments, the bus length of the flared section 31 is ≥ 75% of the bus length of the first inclined surface 11. The bus length of the flared section 31 refers to Figure 2 the dimension indicated by l in

[0051] Verified by experiments, the bus length of the flared section 31 meeting the above requirements is beneficial to improving the sealing reliability of the connecting pipe 3.

[0052] In some exemplary embodiments, the first inclined surface 11 and the second inclined surface 21 are parallel to each other. The difference between the slope of the first gasket 4 and the slope of the first inclined surface 11 is within the range of ±2°. The difference between the slope of the second gasket 5 and the slope of the first inclined surface 11 is within the range of ±2°. The slopes of the first gasket 4 and the second gasket 5 refer to Figure 2 the angle indicated by α in

[0053] Verified by experiments, the slopes of the first inclined surface 11, the second inclined surface 21, the first gasket 4, and the second gasket 5 meeting the above requirements are beneficial to improving the sealing reliability of the connecting pipe 3.

[0054] In the embodiments of the present application, the bus lengths of the first gasket 4, the second gasket 5, the first inclined surface 11, the first inclined surface 11, and the bus length of the flared section 31 refer to the original lengths, that is, the lengths before the connecting pipe 3 sealing device undergoes plastic deformation. The thicknesses of the first gasket 4, the second gasket 5, and the flared section 31 refer to the original thicknesses, that is, the thicknesses before the connecting pipe 3 sealing device undergoes plastic deformation. The slopes of the first inclined surface 11, the second inclined surface 21, the first gasket 4, and the second gasket 5 refer to the original slopes, that is, the slopes before the connecting pipe 3 sealing device undergoes plastic deformation.

[0055] The embodiment of the present application also provides an air conditioner, which includes the connecting pipe 3 sealing device in any one of the above embodiments, and thus has all the above beneficial effects, which will not be elaborated here. One end of the connecting valve 1 away from the connecting pipe 3 can communicate with the refrigerant inlet and outlet of the indoor unit of the air conditioner, and the other end of the connecting pipe 3 can communicate with the refrigerant inlet and outlet of the outdoor unit of the air conditioner.

[0056] The air conditioner can be a common air conditioner using non-flammable refrigerant, or an air conditioner using flammable refrigerant such as R290. Among them, the air conditioner using flammable refrigerant has higher sealing requirements for the connecting pipe 3.

[0057] Some embodiments will be introduced below.

[0058] The first group of embodiments

[0059] The first group of embodiments includes five embodiments. The difference between the five embodiments is that the surface roughness Ra of the first sealing gasket 4 and the second sealing gasket 5 is different. Each embodiment includes 10 samples (No. 1# to No. 10#).

[0060] Test conditions: Connecting pipe 3 specifications - outer diameter * wall thickness: Φ6mm * 0.5mm, and the material used is TP2; the materials of the first sealing gasket 4 and the second sealing gasket 5 are copper, and the thickness is 1 / 4 of the thickness of the flared section 31; the bus length of the first sealing gasket 4 is the same as the bus length of the first inclined surface 11, and the length of the second sealing gasket 5 is the same as the bus length of the second inclined surface 21; the slopes of the first inclined surface 11, the first sealing gasket 4, the second inclined surface 21, and the second sealing gasket 5 are the same; use sandpaper to polish the surface of the conical gasket into different specifications of surface roughness.

[0061] Test steps: After sealing 10 samples with five different sealing methods with the standard sealing torque, immerse them completely in water, and conduct a water test with 3MPa nitrogen. If there are no bubbles generated within 5 minutes, it is considered that the seal is qualified and there is no leakage. The test results are shown in the following table (in the table, the first sealing gasket 4 and the second sealing gasket 5 are simply referred to as conical gaskets):

[0062]

[0063] The above test results show that when the surface roughness Ra of the first sealing gasket 4 and the second sealing gasket 5 ≤ 3.2, no leakage occurred, and the sealing reliability of the connecting pipe 3 is the best.

[0064] The second group of embodiments

[0065] The second group of embodiments includes four embodiments. The difference between the four embodiments is that the slopes of the first sealing gasket 4 and the second sealing gasket 5 are different. Each embodiment includes 10 samples (No. 1# to No. 10#).

[0066] Test conditions: Specification of the connecting pipe 3 - Outer diameter * Wall thickness: Φ6mm * 0.5mm, and the material used is TP2; The materials of the first gasket 4 and the second gasket 5 are copper, and the thickness is 1 / 4 of the thickness of the flared section 31; The bus length of the first gasket 4 is the same as the bus length of the first inclined surface 11, and the length of the second gasket 5 is the same as the bus length of the second inclined surface 21; The surface roughness of the first gasket 4 and the second gasket 5 is Ra 1.6; There are deviations between the slopes of the first gasket 4 and the first inclined surface 11, and between the slopes of the second gasket 5 and the first inclined surface 11.

[0067] Test steps: After sealing 10 samples with four different sealing methods with the standard sealing torque, fully immerse them in water, and conduct a water inspection with 3MPa nitrogen. If no bubbles are generated within 5 minutes, it means the sealing is qualified and there is no leakage. The test results are shown in the following table (in the table, the first gasket 4 and the second gasket 5 are simply referred to as conical gaskets):

[0068]

[0069] The above test results show that: The slope deviations of the first gasket 4 and the second gasket 5 are ±2°, and no leakage occurred. The sealing reliability of the connecting pipe 3 is the best.

[0070] The third group of embodiments

[0071] The first group of embodiments includes ten embodiments. The difference among the ten embodiments is that: The thicknesses of the first gasket 4 and the second gasket 5 are different, and each embodiment includes 10 samples (No. 1# to No. 10#).

[0072] Test conditions: Specification of the connecting pipe 3 - Outer diameter * Wall thickness: Φ6mm * 0.5mm, and the material used is TP2; The materials of the first gasket 4 and the second gasket 5 are copper; The bus length of the first gasket 4 is the same as the bus length of the first inclined surface 11, and the length of the second gasket 5 is the same as the bus length of the second inclined surface 21; The slopes of the first inclined surface 11, the first gasket 4, the second inclined surface 21, and the second gasket 5 are the same; The surface roughness of the first gasket 4 and the second gasket 5 is Ra 1.6.

[0073] Test steps: After sealing 10 samples with ten different sealing methods with the standard sealing torque, fully immerse them in water, and conduct a water inspection with 3MPa nitrogen. If no bubbles are generated within 5 minutes, it means the sealing is qualified and there is no leakage. The test results are shown in the following table (in the table, the first gasket 4 and the second gasket 5 are simply referred to as conical gaskets):

[0074]

[0075] The above test results show that: the thicknesses of the first gasket 4 and the second gasket 5 are 1 / 5 - 1 / 2 of the thickness of the flare of the connecting pipe 3, and no leakage occurred. The sealing reliability of the connecting pipe 3 is optimal.

[0076] The fourth group of embodiments

[0077] The fourth group of embodiments includes five embodiments. The difference between the five embodiments is that the length ratios of the first gasket 4 and the second gasket 5 are different. Each embodiment includes 10 samples (sample #1 to sample #10).

[0078] Test conditions: Specification of the connecting pipe 3 - outer diameter * wall thickness: Φ6mm * 0.5mm, and the material used is TP2; the materials of the first gasket 4 and the second gasket 5 are copper, and the thickness is 1 / 4 of the thickness of the flared section 31; the surface roughness of the first gasket 4 and the second gasket 5 is Ra 1.6; the slopes of the first inclined surface 11, the first gasket 4, the second inclined surface 21, and the second gasket 5 are the same.

[0079] Test steps: After sealing 10 samples with five different sealing methods with the standard sealing torque, fully immerse them in water, and conduct a water inspection with 3MPa nitrogen. If no bubbles are generated within 5 minutes, it is considered that the seal is qualified and there is no leakage. The test results are shown in the following table (in the table, the first gasket 4 and the second gasket 5 are abbreviated as conical gaskets. The width ratio of the conical gasket refers to: the generatrix length of the first gasket 4 / the generatrix length of the first inclined surface 11, and the generatrix length of the second gasket 5 / the generatrix length of the second inclined surface 21):

[0080]

[0081] The above test results show that: when the generatrix length of the first gasket 4 / the generatrix length of the first inclined surface 11 ≥ 1 / 2 and the generatrix length of the second gasket 5 / the generatrix length of the second inclined surface 21 ≥ 1 / 2, no leakage occurred. The sealing reliability of the connecting pipe 3 is optimal.

[0082] The fifth group of embodiments

[0083] The fifth group of embodiments includes two embodiments. The difference between the two embodiments is that the materials of the connecting pipe 3 are different. One is TU0 and the other is TP2.

[0084] The metallographic diagrams of the connecting pipe 3 of the two embodiments are as shown in Figure 3 and Figure 4 shown. It can be seen from Figure 3 and Figure 4 that the amount of the second-phase particles (the part indicated by the arrow) in the grains and at the grain boundaries of TU0 is significantly less than that of TP2 (TP2: 13.06 pieces / mm 2 , TU0: 0.9 pieces / mm 2) There are a large number of P-rich second phases in TP2, with sizes in the micron range. The presence of these coarse second-phase particles in the thin plate reduces the bonding force between grains, causing stress concentration when stressed, thereby reducing the mechanical properties.

[0085] The flaring simulation thickness change diagrams of the connecting pipe 3 in the two embodiments are as Figure 5 shown. It can be Figure 5 seen that the thickness of the flaring section 31 of the TU0 connecting pipe 3 is more uniform in the circumferential direction (with less fluctuation), while the thickness of the flaring section 31 of the TP2 connecting pipe 3 fluctuates more in the circumferential direction. Therefore, the TU0 material undergoes uniform deformation during the deformation process.

[0086] The above test results show that: under the action of the standard sealing torque, the plasticity, deformation uniformity, and thinning rate after plastic deformation of the TU0 material are better than those of TP2 (the current material of the air-conditioning connecting pipe 3 is TP2). Therefore, the sealing effect is better than that of the TP2 material.

[0087] The sixth group of embodiments

[0088] The sixth group of embodiments includes seven embodiments. The difference among the seven embodiments is that the content (i.e., the addition amount) of the rare earth element Sm in the first gasket 4 and the second gasket 5 is different. Each embodiment includes 10 samples (from 1# to 10#).

[0089] Test conditions: The specification of the connecting pipe 3 - outer diameter * wall thickness: Φ6mm * 0.5mm, and the material used is TP2; the materials of the first gasket 4 and the second gasket 5 are copper, and the thickness is 1 / 4 of the thickness of the flaring section 31; the bus length of the first gasket 4 is the same as the bus length of the first inclined surface 11, and the length of the second gasket 5 is the same as the bus length of the second inclined surface 21; the surface roughness of the first gasket 4 and the second gasket 5 is Ra 1.6; the slopes of the first inclined surface 11, the first gasket 4, the second inclined surface 21, and the second gasket 5 are the same.

[0090] Test steps: After sealing 10 samples with seven different sealing methods with the standard sealing torque, immerse them completely in water and conduct a water inspection with 3MPa nitrogen. If no bubbles are generated within 5 minutes, it means the sealing is qualified and there is no leakage. The test results are shown in the following table (in the table, the first gasket 4 and the second gasket 5 are abbreviated as conical gaskets, and the width ratio of the conical gasket refers to: the bus length of the first gasket 4 / the bus length of the first inclined surface 11, the bus length of the second gasket 5 / the bus length of the second inclined surface 21):

[0091]

[0092] The above test results show that when the rare earth Sm content added to the pure copper of the first gasket 4 and the second gasket 5 is 5 ppm - 200 ppm, no leakage occurs, and the sealing reliability of the connecting pipe 3 is the best.

[0093] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0094] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0095] In the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0096] In the present application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0097] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0098] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A connecting pipe sealing device, characterized in that, Comprising: A connecting pipe, one end of the connecting pipe is provided with a flared section; A connecting valve, which is butt-connected and communicated with the connecting pipe, and one end of the connecting valve communicating with the connecting pipe is provided with a first inclined surface adapted to the flared section, and the first inclined surface is sleeved inside the flared section; A first gasket, which is sleeved between the first inclined surface and the flared section to seal the gap between the first inclined surface and the flared section; A connecting nut, including a threaded section and a limiting section connected to the threaded section, the limiting section is sleeved outside the connecting pipe and is provided with a second inclined surface adapted to the flared section, the first inclined surface, the flared section, and the second inclined surface are all arranged in a frustum shape, the second inclined surface is sleeved outside the flared section to limit the connecting pipe from moving away from the connecting valve; the threaded section is sleeved outside the connecting valve and is threadedly connected to the connecting valve; and A second gasket, which is sleeved between the second inclined surface and the flared section to seal the gap between the second inclined surface and the flared section.

2. The connecting pipe sealing device according to claim 1, wherein The material of the first gasket is any one of copper, aluminum, and magnesium; The material of the second gasket is any one of copper, aluminum, and magnesium.

3. The connecting pipe sealing device according to claim 1, characterized in that, Rare earth element Sm is added to the first gasket and / or the second gasket.

4. The connecting pipe sealing device according to claim 3, wherein The content of the rare earth element Sm is in the range of 5 ppm to 200 ppm.

5. The connecting pipe sealing device according to any one of claims 1 to 4, wherein The material of the connecting pipe is TU0 pipe.

6. The connecting pipe sealing device according to any one of claims 1 to 4, wherein The roughness Ra of the first gasket ≤ 3.2; and / or The roughness Ra of the second gasket ≤ 3.

2.

7. The connecting pipe sealing device according to any one of claims 1 to 4, wherein The thickness of the first gasket is 1 / 5 to 2 / 1 of the thickness of the flared section; and / or The thickness of the second gasket is 1 / 5 to 2 / 1 of the thickness of the flared section.

8. The connecting pipe sealing device according to any one of claims 1 to 4, wherein The generatrix length of the first gasket ≥ 1 / 2 of the generatrix length of the first inclined surface; and / or The generatrix length of the second gasket ≥ 1 / 2 of the generatrix length of the second inclined surface.

9. The connecting pipe sealing device according to any one of claims 1 to 4, characterized in that, The generatrix length of the flared section ≥ 75% of the generatrix length of the first inclined surface.

10. The connecting pipe sealing device according to any one of claims 1 to 4, wherein The first inclined surface and the second inclined surface are parallel to each other, the difference between the slope of the first gasket and the slope of the first inclined surface is within the range of ±2°, and the difference between the slope of the second gasket and the slope of the first inclined surface is within the range of ±2°.

11. An air conditioner, characterized in that, Comprising the connecting pipe sealing device according to any one of claims 1 to 10.

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