Soft and hard pipe connecting structure at end part of R744 air conditioner hose

Abstract

The utility model discloses a soft and hard pipe connecting structure at the end part of an R744 air conditioner hose, which comprises the R744 air conditioner hose and a soft and hard pipe connecting component, wherein the R744 air conditioner hose comprises an innermost barrier layer, an inner rubber layer positioned on the outer side of the barrier layer, a reinforcing layer positioned on the outer side of the inner rubber layer and an outer rubber layer positioned on the outer side of the reinforcing layer; the barrier layer is a metal hose; the soft and hard pipe connecting assembly comprises a connector, a lining core and a rivet sleeve, one side of the connector is connected with the end of the metal hose in a welded mode, the other side of the connector is inserted into the lining core connected with the hard pipe, and a sealing ring is arranged between the connector and the lining core. The inner rubber layer, the reinforcing layer, the outer rubber layer and the outermost rivet sleeve are sequentially wrapped on the outer side of the lining core from inside to outside, and the rivet sleeve is used for riveting the joint, the lining core, the inner rubber layer and the outer rubber layer to form a whole. The utility model has the advantages of low cost, capability of meeting actual working condition requirements and process feasibility, and suitability for mass production.

Description

Technical Field

[0001] The utility model relates to an R744 air-conditioning hose assembly, in particular to a soft and hard pipe connection structure of an R744 air-conditioning hose end joint, belonging to the field of automobile air-conditioning pipeline production and manufacturing. Background Art

[0002] At present, the use of traditional HFCs refrigerants such as R134a will be gradually reduced. CO2, as an environmentally friendly natural refrigerant, has many advantages such as non-toxicity, stability, and natural degradation, and has begun to be gradually applied to the field of automotive air conditioning. At the same time, with the development of new energy vehicles, pure electric vehicles are becoming more and more widely accepted. Since pure electric vehicles do not have engines to provide heat sources, they need to use PTC or heat pump air conditioners for heating. The use of PTC heating will lead to high energy consumption of the air conditioning system in winter, causing a significant decrease in the cruising range of electric vehicles, and the winter cruising range attenuation may even reach more than 50%. The conventional heat pump system currently using R134a refrigerant has low operating efficiency in an environment below -15℃. CO2, as a refrigerant, has superior heat pump performance and can significantly increase the winter cruising range of electric vehicles. Compared with the traditional R134a air conditioning pipeline, the maximum operating pressure of the R744 heat pump air conditioning pipeline is 17MPa, and the operating conditions of the temperature are 165℃, which are much higher than the R134a pipeline. The existing pipeline structure cannot meet the use requirements of R744.

[0003] Due to the high operating temperature and pressure of the R744 heat pump air conditioning system, as well as the system's requirements for extremely low permeability and leakage rates of each component, traditional rubber, plastic, etc. as barrier materials can no longer fully meet the low permeability performance requirements of the pipeline under high temperature; metal corrugated hoses have certain bending fatigue resistance and can completely block the penetration of CO2 gas. Their temperature resistance range far exceeds the working temperature of the R744 heat pump. Therefore, using metal corrugated hoses as a barrier layer for CO2 rubber hoses is a better solution to this problem. Utility Model Content

[0004] The purpose of the utility model is to provide a soft and hard pipe connection structure of an R744 air conditioning hose end joint, which is used to meet the actual working conditions and process feasibility, is suitable for mass production, and meets the actual needs of mass production and low cost.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A soft and hard pipe connection structure for the end of an R744 air-conditioning hose, the soft and hard pipe connection structure comprises an R744 air-conditioning hose and a soft and hard pipe connection assembly, the R744 air-conditioning hose comprises an innermost barrier layer, an inner rubber layer located outside the barrier layer, a reinforcement layer located outside the inner rubber layer, and an outer rubber layer located outside the reinforcement layer, the barrier layer being a metal hose; the soft and hard pipe connection assembly comprises a joint, a liner core and a rivet sleeve, one side of the joint is welded to the end of the metal hose, the other side is inserted into the interior of the liner core connected to the hard pipe, and a sealing ring is provided between the joint and the liner core; the outer side of the liner core sequentially wraps the inner rubber layer, the reinforcement layer, the outer rubber layer and the outermost rivet sleeve from the inside to the outside, the rivet sleeve rivets the joint, the liner core and the inner and outer rubber layers together through riveting to form a whole.

[0007] Furthermore, the metal hose is a metal corrugated hose, and the metal corrugated hose and the joint are connected by welding.

[0008] Furthermore, the joint is made of stainless steel, and an annular conical protrusion is provided on the outer surface of the joint, which fits with the liner core under riveting action, further improving the anti-pull-out performance of the soft and hard pipe connection structure.

[0009] Furthermore, the outer surface of the joint is provided with a groove for assembling a sealing ring.

[0010] Furthermore, an annular limiting boss is provided at the tail end where the connector is connected to the metal hose, the outer diameter of the annular limiting boss is consistent with the outer diameter of the metal hose, and an internal thread is provided in the other end of the connector.

[0011] Furthermore, the liner core is made of aluminum alloy, the hard tube is an aluminum tube, the liner core and the aluminum tube are connected by flame brazing, laser welding, furnace welding, argon arc welding, or the liner core is directly formed by extrusion or spinning at the end of the aluminum tube.

[0012] Furthermore, the outer surface of the liner core is provided with two or more annular protrusions, which fit with the inner rubber layer after assembly. The liner core is assembled between the inner rubber layer and the joint, forming an interference fit with the inner rubber layer and a clearance fit with the joint.

[0013] Furthermore, an annular groove is provided on the outer surface of the end portion of the connecting side of the lining core and the aluminum tube; the rivet sleeve is an iron sleeve or an aluminum sleeve, and an inward annular boss is provided on the head of the rivet sleeve, and the annular boss is embedded in the annular groove; after riveting under the action of the rivet claws, the rivet sleeve is plastically deformed inwardly to form several grooves evenly arranged circumferentially, squeezing the outer rubber layer, the reinforcement layer, the inner rubber layer, the lining core, the sealing ring, and the joint, so that the internal components of the rivet sleeve are tightly fitted to form a tight combination, and at the same time, the rivet sleeve cooperates with the annular protrusion of the lining core, and the inward protrusion formed after the rivet sleeve is riveted is staggered with the annular protrusion of the lining core, which greatly improves the anti-pull-out performance of the soft and hard tube connection structure.

[0014] The preparation method for the soft and hard pipe connection at the end of the R744 air conditioning hose comprises the following steps:

[0015] Step 1: Cut the metal corrugated hose to the required length and weld the end to the joint;

[0016] Step 2: Connect the sleeve and the mandrel to the adapter through threads; insert the mandrel into the welded corrugated pipe, and connect one end of the joint to the adapter through threads to form a minimum corrugated pipe connection unit; connect multiple such minimum connection units through the external thread of the mandrel end of the previous connection unit and the internal thread of the second adapter, so that the welded metal corrugated hose with two joints is connected through the connecting tool to form a unit to be extruded;

[0017] Step 3: extrude or coat a rubber layer on the outside of the unit to be extruded as an inner rubber layer; in the extrusion method, connect the extruder head to a vacuum device to make the inner rubber layer fit with the metal corrugated hose;

[0018] Step 3: Weave or wind the reinforcement layer on the outside of the inner rubber layer. During the weaving or winding process, the inner rubber layer is further fitted with the metal corrugated hose and the connecting tooling through the certain tension of the reinforcement layer braided wire. At this time, the inner rubber fills into each trough and groove;

[0019] Step 4: Extrude an outer rubber layer on the outside of the reinforcement layer. The outer rubber layer is bonded to the reinforcement layer under the action of a subsequent vulcanization process. At the same time, the outer rubber layer is bonded to the inner rubber layer through the gaps between the braided wires of the reinforcement layer to form a mutually bonded whole.

[0020] Step 5: According to the length of the metal corrugated hose and the connecting tooling, calculate and confirm the cutting position of the hose after vulcanization, cut the inner and outer rubber layers and the reinforcing layer, take out the connecting tooling, and form multiple hoses to be assembled;

[0021] Step 6: Assemble the sealing ring on the joint (this step can be performed before step 2);

[0022] Step 7: Install the rivet sleeve and the lining core connected to the hard pipe at the end of the hose to be assembled, until the annular inward boss of the rivet sleeve head faces the annular groove of the lining core;

[0023] Step 8. Use a riveting machine to rivet. Under the riveting action of the rivet claws, the annular boss on the head of the rivet sleeve is squeezed and deformed to closely fit with the annular groove to form a whole. At the same time, the rivet sleeve is compressed and deformed to squeeze the outer rubber layer, reinforcement layer, inner rubber layer, lining core, and joint of the hose to form a tight soft and hard pipe connection structure.

[0024] The mandrel, adapter and sleeve are used as connecting tools for connecting soft and hard pipes, wherein:

[0025] The outer diameter of the mandrel is smaller than the inner diameter of the bellows and its end joints, and both ends thereof are provided with external threads to match the adapter;

[0026] The adapter is a multi-section cylindrical hollow structure, with an external thread on the outside of the small diameter end thereof, which is used to match the internal thread of the casing and the internal thread of the connector, and an internal thread on the inside of the small diameter end thereof, which is used to match the external thread of the mandrel. The large diameter end of the adapter is a thin-walled structure, and its inner diameter is larger than the outer diameter of the connector, which is consistent with the outer diameter of the metal corrugated hose. After being connected to the connector at the end of the metal corrugated hose, the connector forms a clearance fit with it;

[0027] The sleeve is a cylindrical hollow structure, one end of which is provided with an internal thread for matching with the external thread at the end of the adapter; the inner diameter of the other end is larger than the outer diameter of the connector and is consistent with the outer diameter of the metal corrugated hose.

[0028] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0029] (1) The structure of the utility model can be assembled first and then riveted to compress the sealing ring, which effectively solves the problem that the sealing ring needs to have a certain amount of compression when sealed with a rubber sealing ring. At the same time, in order to meet the high temperature and high pressure sealing requirements of CO2, the rubber material is required to have a higher hardness. However, the higher material hardness makes it difficult to have a higher amount of compression during the assembly process.

[0030] (2) The manufacturing process of the overall structure of the utility model is relatively simple, low-cost, easy to control, and suitable for mass production. It only requires connecting the corrugated pipes after welding, coating or extruding the inner layer of rubber on the outside, weaving and extruding the outer layer of rubber, cutting after vulcanization, assembling the sealing ring, lining core, and aluminum sleeve, and then riveting. Compared with the traditional air-conditioning pipe production process, it will not significantly increase the cost.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0033] Figure 2 is a schematic diagram of the joint and the bellows after welding;

[0034] Figure 3 This is a schematic diagram of the rubber hose after vulcanization and cutting;

[0035] Figure 4 It is a schematic diagram of connecting a metal corrugated hose and a connecting tool to form a minimum connection unit;

[0036] Figure 5 It is a schematic diagram of two minimum connection units connected;

[0037] Figure 6 A schematic diagram of a mandrel of one of the connecting tools described in the utility model;

[0038] Figure 7 A schematic diagram of an adapter of one of the connecting tools described in the utility model;

[0039] Figure 8 This is a schematic diagram of a sleeve of one of the connecting tools described in the utility model.

[0040] Markings in the figure are: 1-barrier layer, 2-inner rubber layer, 3-reinforcement layer, 4-outer rubber layer, 5-joint, 5a-annular limiting boss, 5b-annular conical protrusion, 5c-groove, 5d-internal thread at the end of the joint, 6-sealing ring, 7-core liner, 8-rivet sleeve, 9-aluminum tube, 10-mandrel, 10a-mandrel end thread, 10b-milling plane, 11a-external thread at the end of the casing, 11b-internal thread at the end of the casing, 12-adapter, 12a-external thread of the adaptor, 12b-internal thread of the adaptor, 12c-thin wall of the adaptor. DETAILED DESCRIPTION

[0041] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Embodiment 1

[0043] like Figure 1As shown, a soft and hard pipe connection structure at the end of an R744 air conditioning hose comprises an R744 air conditioning hose and a soft and hard pipe connection assembly, wherein the R744 air conditioning hose comprises a barrier layer 1, an inner rubber layer 2 located outside the barrier layer 1, a reinforcement layer 3 located outside the inner rubber layer 2, and an outer rubber layer 5 located outside the reinforcement layer 3, wherein the barrier layer 1 is a metal corrugated hose that can completely block the high-temperature and high-pressure CO2 inside the pipe body from penetrating outward, and the soft and hard pipe connection assembly comprises a joint 5, a lining core 7 and a rivet sleeve 8, wherein one end of the joint 5 is welded to the end of the metal corrugated hose 1, and the other end is inserted into the lining core 7 for connecting to a hard pipe 9, as shown in FIG. Figure 2 As shown, the outer side of the joint 5 is provided with a groove 5c, and the groove 5c is equipped with a sealing ring 6, which cooperates with the inner side of the lining core 7; after the lining core 7 is installed between the joint 5 and the inner rubber layer 2, the outer side wall of the lining core 7 sequentially wraps the inner rubber layer 2, the reinforcement layer 3, the outer rubber layer 4 and the rivet sleeve 8 from the inside to the outside, and the joint 5 and the lining core 7 are riveted by the rivet sleeve 8, and the outer side port of the lining core 7 is connected to the hard pipe 9. Figure 2 As shown, the joint 5 and the metal hose 1 are connected by welding to form a whole, thereby ensuring good sealing and providing internal strength support when riveted with the rivet sleeve 8.

[0044] Embodiment 2

[0045] The structure of this embodiment is basically the same as that of the first embodiment, except that, in order to improve the sealing performance of the riveted joint, two sealing ring grooves are provided on the joint 5, and two sealing rings 6 are used to seal the connection structure of the soft and hard pipes. The two sealing rings have good high temperature resistance and low temperature resistance respectively; since the molecular weight of CO2 is small and the permeability is strong, the double sealing ring structure can further improve the high temperature resistance and low temperature resistance permeability of the soft drinking pipe connection structure;

[0046] Embodiment 3

[0047] A preparation method for connecting a soft pipe with a hard pipe at the end of an R744 air conditioning hose, comprising the following steps:

[0048] Step 1: Cut the metal corrugated hose to the required length and weld the end to the joint;

[0049] Step 2: Connect the sleeve and the mandrel to the adapter through threads; insert the mandrel into the welded corrugated pipe, and connect one end of the joint to the adapter through threads to form a minimum corrugated pipe connection unit; connect multiple such minimum connection units through the external thread of the mandrel end of the previous connection unit and the internal thread of the second adapter, so that the welded metal corrugated hose with two joints is connected through the connecting tool to form a unit to be extruded;

[0050] Step 3: extrude or coat a rubber layer on the outside of the unit to be extruded as an inner rubber layer; in the extrusion method, connect the extruder head to a vacuum device to make the inner rubber layer fit with the metal corrugated hose;

[0051] Step 3: Weave or wind the reinforcement layer on the outside of the inner rubber layer. During the weaving or winding process, the inner rubber layer is further fitted with the metal corrugated hose and the connecting tooling through the certain tension of the reinforcement layer braided wire. At this time, the inner rubber fills into each trough and groove;

[0052] Step 4: Extrude an outer rubber layer on the outside of the reinforcement layer. The outer rubber layer is bonded to the reinforcement layer under the action of a subsequent vulcanization process. At the same time, the outer rubber layer is bonded to the inner rubber layer through the gaps between the braided wires of the reinforcement layer to form a mutually bonded whole.

[0053] Step 5: According to the length of the metal corrugated hose and the connecting tooling, calculate and confirm the cutting position of the hose after vulcanization, cut the inner and outer rubber layers and the reinforcing layer, take out the connecting tooling, and form multiple hoses to be assembled;

[0054] Step 6: Assemble the sealing ring on the joint (this step can be performed before step 2);

[0055] Step 7: Install the rivet sleeve and the lining core connected to the hard pipe at the end of the hose to be assembled, until the annular inward boss of the rivet sleeve head faces the annular groove of the lining core;

[0056] Step 8. Use a riveting machine to rivet. Under the riveting action of the rivet claws, the annular boss on the head of the rivet sleeve is squeezed and deformed to closely fit with the annular groove to form a whole. At the same time, the rivet sleeve is compressed and deformed to squeeze the outer rubber layer, reinforcement layer, inner rubber layer, lining core, and joint of the hose to form a tight soft and hard pipe connection structure.

[0057] In this embodiment, the mandrel 10, adapter 11, and sleeve 12 are used as connecting tools for connecting soft and hard pipes, wherein:

[0058] The outer diameter of the mandrel 10 is smaller than the inner diameter of the bellows and its end joints, and both ends thereof are provided with external threads to match the adapter;

[0059] The adapter 11 is a multi-section cylindrical hollow structure, with an external thread on the outside of the small diameter end for matching with the internal thread of the sleeve and the internal thread of the connector, and an internal thread on the inside of the small diameter end for matching with the external thread of the mandrel. The large diameter end of the adapter is a thin-walled structure, with an inner diameter greater than the outer diameter of the connector, which is consistent with the outer diameter of the metal corrugated hose. After being connected to the connector at the end of the metal corrugated hose, the connector forms a clearance fit with it.

[0060] The sleeve 12 is a cylindrical hollow structure, one end of which is provided with an internal thread for matching with the external thread at the end of the adapter; the inner diameter of the other end is larger than the outer diameter of the adapter and is consistent with the outer diameter of the metal corrugated hose.

[0061] like Figures 4 to 8 As shown, the mandrel 10 and the adapter 12 are connected by matching the external thread 10a at the end of the mandrel 10 with the internal thread 12d at the end of the adapter 12. The outer side of the mandrel 10 and the outer side of the adapter 12 are respectively provided with milling planes to provide support for the threaded tightening connection between the mandrel 10 and the adapter 12; the internal thread 11b at the end of the sleeve 11 is matched with the external thread 12a at the end of the adapter 12, and the sleeve 11 is provided with an outer milling plane to provide support for the threaded tightening with the adapter 12; after the three connection tools are connected, the internal thread 5d at the end of the connector 5 is connected with the adapter The outer thread 12 at the end of 12 matches, and is connected by thread to the thin-walled end of the sleeve 11 and the welding and annular limiting boss 5a involved in the joint 5; the outer diameter of the sleeve 11 is consistent or basically consistent with the outer diameter of the corrugated hose, which can ensure the consistency of the outer diameter after the subsequent inner layer rubber is extruded or coated; the length of the mandrel matches the total length of the metal corrugated hose 1 after the welding joint 5; after the above-mentioned mandrel 10, sleeve 11, adapter 12 and the metal corrugated hose after the welding joint 5 are connected to each other, a minimum unit to be extruded is formed.

[0062] like Figure 5As shown, two minimum units to be extruded are connected by matching the thread 10a at the end of the previous mandrel 10 with the internal thread 12b of the subsequent adapter 12. The end of the adapter 12 is provided with a thin wall 12c, which is interference-fitted with the end connector 5 on the other side of the corrugated tube of the previous minimum connection unit; the outer diameter of the thin wall 12c at the end of the adapter 12 is consistent or substantially consistent with the outer diameter of the metal corrugated hose; multiple minimum connection units are connected to each other by the above method, and the rubber layer is extruded from the outside. During the extrusion process, since the extruder head is connected to a vacuum device, the inner rubber layer 4 is fitted with the metal corrugated hose 1, the adapter 12, and the sleeve 11; at the same time, the inner rubber The outer side of layer 2 is a reinforcing layer 3, which is formed by weaving or winding. The reinforcing layer 3 is preferably woven with steel wires, and further, copper-plated steel wires. During the weaving process, since the reinforcing layer 3 braided wire has a certain tensile force, the rubber-coated or extruded inner rubber layer 2 is further fitted with the metal hose 1, and the inner rubber fills into each trough and groove, which improves the stability of the metal corrugated hose under high pressure. At the same time, the inner rubber layer 2 prevents the steel wires of the reinforcing layer 3 from directly contacting the metal hose, causing the direct contact steel wires to wear the thin-walled metal corrugated hose, resulting in the problem of damage and leakage of the metal corrugated hose. The outer side of the reinforcing layer 3 is an extruded outer rubber layer 4, which is bonded to the reinforcing layer 3 under the action of the subsequent vulcanization process. At the same time, the outer rubber layer 4 is bonded to the inner rubber layer 2 through the gaps between the reinforcing layer 3 braided wires, so that a mutually bonded whole is formed, which has good mechanical properties on the basis of certain soft properties.

[0063] After vulcanization and unwinding of the rubber tube, according to the actual length of the metal corrugated hose and each connecting tool, cut the outer rubber layer 4, the reinforcing layer 3 and the inner rubber layer 2 along the connection between the adapter 12 and the sleeve 11, remove the connecting tool, and form a cavity between the connector 5 and the inner rubber layer 2; trim the hose end and assemble the sealing ring to obtain the following Figure 3 The hose structure and end structure shown;

[0064] Embodiment 4

[0065] The difference between this embodiment and the third embodiment is that the three connecting tools (10, 11, 12) are combined into a whole in pairs or the three connecting tools (10, 11, 12) are made into one body.

[0066] Embodiment 5

[0067] The difference between this embodiment and the third embodiment is that the sealing ring 6 is assembled before the assembly tool (10, 11, 12) is connected to the joint 5.

[0068] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the above embodiments do not limit the protection scope of the utility model in any form, and all technical solutions obtained by equivalent replacement and other methods fall within the protection scope of the utility model. The parts not involved in the utility model are the same as the existing technology or can be implemented by the existing technology.

Claims

1. A soft and hard pipe connection structure at the end of an R744 air conditioning hose, the soft and hard pipe connection structure comprising an R744 air conditioning hose and a soft and hard pipe connection assembly, wherein the R744 air conditioning hose comprises an innermost barrier layer, an inner rubber layer located outside the barrier layer, a reinforcement layer located outside the inner rubber layer, and an outer rubber layer located outside the reinforcement layer, characterized in that: The barrier layer is a metal hose; the soft and hard pipe connection assembly includes a joint, a lining core and a rivet sleeve, one side of the joint is welded to the end of the metal hose, and the other side is inserted into the lining core connected to the hard pipe, and a sealing ring is provided between the joint and the lining core; the outer side of the lining core is wrapped with the inner rubber layer, the reinforcement layer, the outer rubber layer and the outermost rivet sleeve in sequence from the inside to the outside, and the rivet sleeve rivets the joint, the lining core and the inner and outer rubber layers together through riveting to form a whole.

2. The soft and hard pipe connection structure at the end of the R744 air conditioning hose according to claim 1, characterized in that: The metal hose is a metal corrugated hose, and the metal corrugated hose and the joint are connected by welding.

3. The soft and hard pipe connection structure at the end of the R744 air conditioning hose according to claim 1, characterized in that: The joint is made of stainless steel, and an annular conical protrusion is provided on the outer surface of the joint, which fits with the liner core under riveting action, further improving the anti-pull-out performance of the soft and hard pipe connection structure.

4. The soft and hard pipe connection structure at the end of the R744 air conditioning hose according to claim 1, characterized in that: The outer surface of the joint is provided with a groove for assembling a sealing ring.

5. The soft and hard pipe connection structure at the end of the R744 air conditioning hose according to claim 1, characterized in that: The tail end of the connector connected to the metal hose is provided with an annular limiting boss, the outer diameter of the annular limiting boss is consistent with the outer diameter of the metal hose, and the other end of the connector is provided with an internal thread.

6. The soft and hard pipe connection structure at the end of the R744 air conditioning hose according to claim 1, characterized in that: The liner core is made of aluminum alloy, the hard tube is an aluminum tube, the liner core and the aluminum tube are connected by flame brazing, laser welding, furnace welding, argon arc welding, or the liner core is directly formed by extrusion or spinning at the end of the aluminum tube.

7. The soft and hard pipe connection structure at the end of the R744 air conditioning hose according to claim 1, characterized in that: The outer surface of the liner core is provided with two or more annular protrusions, which fit with the inner rubber layer after assembly. The liner core is assembled between the inner rubber layer and the joint, forming an interference fit with the inner rubber layer and a clearance fit with the joint.

8. The soft and hard pipe connection structure at the end of the R744 air conditioning hose according to claim 1, characterized in that: An annular groove is provided on the outer surface of the end portion of the connecting side of the lining core and the aluminum tube; the rivet sleeve is an iron sleeve or an aluminum sleeve, and the head of the rivet sleeve is provided with an inward annular boss, which is embedded in the annular groove; after riveting under the action of the rivet claws, the rivet sleeve is plastically deformed inward to form several grooves evenly arranged in the circumferential direction, squeezing the outer rubber layer, the reinforcement layer, the inner rubber layer, the lining core, the sealing ring, and the joint, so that the internal components of the rivet sleeve fit tightly to form a tight combination.

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