A sealing flange joint for R744 refrigerant high-pressure air conditioning pipeline

Abstract

The present invention relates to the technical field of sealing pipe joints, and in particular to a sealing flange joint for an R744 refrigerant high-pressure air-conditioning pipeline, comprising a male joint, a female joint, a gasket and a sealing ring. The male joint is fixedly mounted on the end of pipe one, and the female joint is fixedly mounted on the end of pipe two. A first convex ring is protruding from the end face of the male joint, and at least one circle of first sharp teeth is provided on the end face of the first convex ring. A sealing countersunk hole is provided on the end face of the female joint, and a sealing ring mounting groove is provided on the hole wall of the sealing countersunk hole, and at least one circle of second sharp teeth is provided on the bottom surface thereof. The gasket is made of soft metal, and the sealing ring is mounted in the sealing ring mounting groove and sleeved on the first convex ring. The male joint and the female joint are tightly connected, and a soft and hard dual combination seal is realized at the same time, which greatly improves the sealing performance and safety performance of the air-conditioning pipeline, adapts to the sealing connection under high vibration conditions, and the gasket deforms evenly, meeting the use requirements of convenient disassembly and assembly in a limited space, and the gasket or the sealing ring is easy to replace.

Description

Technical Field

[0001] The invention relates to the technical field of sealed pipe joints, in particular to a sealed flange joint for an R744 refrigerant high-pressure air-conditioning pipeline. Background Art

[0002] In automotive air conditioning systems using common refrigerants (HFC-134a and HFO-1234yf), rubber O-rings are a common sealing method. They offer a simple structure, low cost, and easy installation. However, these systems typically operate at pressures between 1.5 and 3.5 MPa, which falls under low- to medium-pressure categories. Rubber O-rings fully meet these requirements in terms of sealing reliability and durability. However, for systems operating at pressures exceeding 6 MPa, the durability of rubber seals decreases significantly. Especially under conditions of high internal temperature, pressure, and vehicle body vibration, rubber seals are prone to leakage, leading to system failure.

[0003] With the continuous promotion of global energy conservation and emission reduction policies, refrigerants with severe greenhouse effects such as HFC-134a have been clearly scheduled for elimination within a limited time. At the same time, the rise of new energy vehicles, represented by pure electric vehicles, has made heat pump systems increasingly standard in automotive air conditioning. R744 (CO2) has excellent heating performance, safety, environmental protection and low price, making it the only choice for electric vehicle heat pump systems. However, compared with ordinary HFC-134a refrigerant, R744 has a higher operating pressure of 7-12MPa, which is not suitable for existing sealing structures.

[0004] Due to the space requirements inside the car, the compact design of the car's functional components is also being strengthened, which has also created new difficulties for the layout and connection installation of air-conditioning pipes. The overly complex sealing connection structure cannot meet the needs of disassembly and assembly of air-conditioning pipes in a limited space. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies of the existing problems, the present invention provides a sealing flange joint for an R744 refrigerant high-pressure air-conditioning pipeline.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a R744 refrigerant high-pressure air-conditioning pipeline sealing flange joint, including a male joint, a female joint, a gasket and a sealing ring, the male joint is fixedly installed at the end of pipe one, and the female joint is fixedly installed at the end of pipe two. A first convex ring is protruding from the end face of the male joint, and at least one circle of first tines is provided on the end face of the first convex ring. A sealing countersunk hole is provided on the end face of the female joint, and a sealing ring mounting groove is provided on the hole wall of the sealing countersunk hole, and at least one circle of second tines is provided on its bottom surface. The gasket is made of soft metal and is clamped between the first tines and the second tines. The sealing ring is installed in the sealing ring mounting groove and is sleeved on the first convex ring. The male joint and the female joint are tightly connected.

[0007] Specifically, by providing a sealing ring and a gasket, when the male connector and the female connector are tightly connected, the first tines and the second tines are simultaneously pressed into the side surfaces of the gasket, causing the gasket to deform plastically. The male connector, the gasket and the female connector form a tightly fitting hard seal that can withstand high-temperature and high-pressure refrigerants. At the same time, the sealing ring is also squeezed to form a second seal, and a soft and hard dual combination seal is achieved at the same time, which greatly improves the sealing performance and safety performance of the air-conditioning pipeline and adapts to sealed connections under high vibration conditions. At the same time, the sealing ring and the gasket can be pre-installed in advance, which is convenient for pipe docking in a compact space and meets the requirements of convenient disassembly and assembly in a limited space. The sealing ring also has a dust-proof function. On the whole, a group and sealing structure is formed with a soft metal extruded mechanical seal as the main body and a rubber sealing ring as the auxiliary body.

[0008] According to another embodiment of the present invention, two first side ears are symmetrically provided on either side of the male connector, and two second side ears are correspondingly symmetrically provided on either side of the female connector, wherein the first and second side ears are fixedly connected by fasteners. The fixed connection by the fasteners on both sides provides a strong bond and high strength between the male and female connectors, improving the hard seal and ensuring sealing performance under high vibration conditions. Under symmetrical compression, the gasket deforms evenly, preventing local damage due to excessive force, and improving the reliability and durability of the seal.

[0009] According to another embodiment of the present invention, a second protruding ring is provided on the end face of the male connector, located outside the first protruding ring. A nylon retainer is fixedly mounted on the second protruding ring. A mounting ring groove is provided on the inner side of the nylon retainer. The gasket is clamped in the mounting ring groove, with one side thereof abutting the first tines. The nylon retainer is located in a sealing counterbore. The base of the sealing counterbore is provided with a clearance groove for the nylon retainer. By providing the nylon retainer, the gasket can be pre-installed on the end face of the male connector, and the sealing ring can be pre-installed on the first protruding ring. The nylon retainer prevents the sealing ring from falling off, facilitating a sealed connection between the male and female connectors. The nylon retainer cooperates with the sealing counterbore with a small gap, serving as a centering function during the connection between the male and female connectors, eliminating the need for additional locating pins.

[0010] According to another embodiment of the present invention, a retaining groove is provided at the connection between the second protruding ring and the first protruding ring, a first retaining ring and a second retaining ring are provided on the inner sides of both ends of the nylon retainer, and a mounting groove is formed between the first retaining ring and the second retaining ring, and the first retaining ring is retained in the retaining groove, thereby facilitating the assembly and disassembly of the nylon retainer and the male connector.

[0011] According to another embodiment of the present invention, the inner hole of the first retaining ring is a tapered hole with a larger outer side, and the end of the second convex ring is correspondingly provided with a chamfered conical surface, so as to facilitate the installation of the nylon retainer on the male connector.

[0012] According to another embodiment of the present invention, the sealing ring mounting groove is formed by a stepped hole on the end surface of the female connector. This effectively shortens the length of the sealing flange joint, adapting to space constraints and facilitating replacement of the sealing ring. When the male and female connectors are securely connected, the sealing ring is also subjected to compressive force along its thickness, acting as a pressure buffer and ensuring a more uniform gasket seal.

[0013] The beneficial effect of the present invention is that the male connector, gasket and female connector form a tightly fitting hard seal that can withstand high-temperature and high-pressure refrigerants. At the same time, the sealing ring is also squeezed to form a second seal, and a soft and hard dual combination seal is achieved. The sealing performance and safety performance of the air-conditioning pipeline are greatly improved, and the sealing connection under high vibration conditions is adapted. The gasket deforms evenly. At the same time, the sealing ring and gasket can be pre-installed in advance, which is convenient for pipe docking in a compact space and meets the use requirements of convenient disassembly and assembly in a limited space. The gasket or sealing ring is easy to replace, and the sealing ring also has a dust-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and examples.

[0015] Figure 1 It is a schematic cross-sectional view of the present invention;

[0016] Figure 2 yes Figure 1 Enlarged image at the middle X;

[0017] Figure 3 It is a left side schematic diagram of the present invention.

[0018] In the figure, tube 1 1, tube 2 2, male connector 3, first convex ring 31, second convex ring 32, retaining groove 33, first sharp tooth 34, first side ear 35, female connector 4, sealing ring mounting groove 41, sealing countersunk hole 42, avoidance groove 43, second sharp tooth 44, second side ear 45, gasket 5, nylon retainer 6, first retaining ring 61, second retaining ring 62, mounting ring groove 63, sealing ring 7, and fastener 8. DETAILED DESCRIPTION

[0019] like Figure 1-3It is a structural schematic diagram of the present invention, a R744 refrigerant high-pressure air-conditioning pipeline sealing flange joint, including a male joint 3, a female joint 4, a gasket 5 and a sealing ring 7, the male joint 3 is fixedly installed at the end of pipe 1, and the female joint 4 is fixedly installed at the end of pipe 2 2, a first convex ring 31 is protruding from the end face of the male joint 3, and at least one circle of first tines 34 are provided on the end face of the first convex ring 31, a sealing countersunk hole 42 is provided on the end face of the female joint 4, a sealing ring mounting groove 41 is provided on the hole wall of the sealing countersunk hole 42, and at least one circle of second tines 44 are provided on the bottom surface thereof, the gasket 5 is made of soft metal and is clamped between the first tines 34 and the second tines 44, the sealing ring 7 is installed in the sealing ring mounting groove 41 and is sleeved on the first convex ring 31, and the male joint 3 and the female joint 4 are tightly connected.

[0020] The first tube 1 and the second tube 2 are both high-strength aluminum alloy tubes. The male connector 3 and the female connector 4 can also be made of a relatively high-hardness aluminum alloy and are welded to the first tube 1 and the second tube 2, respectively.

[0021] The male connector 3 and female connector 4 have a hardness greater than or equal to HV100, while the gasket 5 has a hardness less than or equal to HV20. The male connector 3 and female connector 4 have a hardness more than five times that of the gasket 5, which prevents damage to the first and second tines 34 and 44 when they penetrate the surface of the gasket 5. Furthermore, the first and second tines 34 and 44 are more easily pressed into the gasket 5, resulting in a more reliable and stable seal.

[0022] The sealing ring 7 can be an O-shaped rubber sealing ring. The outer circumference of the gasket 5 fits within the sealing counterbore 42 with a small clearance, and can be pre-installed into the sealing counterbore 42. The sealing ring mounting groove 41 is an inner annular groove, and the sealing ring 7 can be pre-installed into the sealing ring mounting groove 41. The sealing ring 7 can prevent the gasket 5 from falling out of the sealing counterbore 42.

[0023] The outer circle of the gasket 5 may be drum-shaped, and the maximum outer circle size thereof is interference-fitted with the sealing counterbore 42 .

[0024] The cross-section of the first tines 34 and the second tines 44 can be triangular or semicircular, and when triangular, the top of the tines 34 and the second tines 44 can be provided with an arc. The first tines 34 and the second tines 44 can be provided with a concentric multi-circle structure.

[0025] The male connector 3 and the female connector 4 can be fastened together by using bolts through a plurality of axial bolt holes, or by using a ferrule nut sleeved on the male connector 3, which is threadedly connected to the female connector 4.

[0026] Preferably, two first side ears 35 are symmetrically provided on both sides of the male connector 3, and two second side ears 45 are correspondingly symmetrically provided on both sides of the female connector 4. The first side ears 35 and the second side ears 45 are fixedly connected by fasteners 8. When fasteners 8 are tightened, the two sides are tightened alternately. The fasteners 8 can be bolts.

[0027] Preferably, a second convex ring 32 is provided on the end face of the male connector 3 on the outside of the first convex ring 31, and a nylon retainer 6 is fixedly mounted on the second convex ring 32. A mounting ring groove 63 is provided on the inner side of the nylon retainer 6. The gasket 5 is clamped in the mounting ring groove 63, and one side thereof abuts against the first tines 34. The nylon retainer 6 is located in the sealing countersunk hole 42, and an avoidance groove 43 for avoiding the nylon retainer 6 is provided at the root of the sealing countersunk hole 42.

[0028] The nylon retainer 6 can be threadedly connected to the second protruding ring 32 .

[0029] Preferably, a clamping groove 33 is provided at the connection between the second convex ring 32 and the first convex ring 31, and a first clamping ring 61 and a second clamping ring 62 are provided on the inner sides of both ends of the nylon retainer 6. The first clamping ring 61 and the second clamping ring 62 form an installation ring groove 63, and the first clamping ring 61 is clamped in the clamping groove 33.

[0030] The nylon retainer 6 may be a straight slot opening structure, which is convenient for inserting the gasket 5 and convenient for fitting it onto the second convex ring 32 .

[0031] Preferably, the inner hole of the first retaining ring 61 is a tapered hole with a larger outer side, and the end of the second convex ring 32 is correspondingly provided with a chamfered conical surface.

[0032] Preferably, the sealing ring installation groove 41 is formed by a stepped hole on the end surface of the female connector 4 .

[0033] The above description is only illustrative of the present invention and not restrictive. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the appended claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A R744 refrigerant high-pressure air conditioning pipeline sealing flange joint, characterized in that: The invention comprises a male connector (3), a female connector (4), a gasket (5) and a sealing ring (7), wherein the male connector (3) is fixedly mounted on the end of the first pipe (1), and the female connector (4) is fixedly mounted on the end of the second pipe (2). A first convex ring (31) is protruding from the end surface of the male connector (3), and at least one circle of first sharp teeth (34) is provided on the end surface of the first convex ring (31). A sealing countersunk hole (42) is provided on the end surface of the female connector (4), and a sealing ring is provided on the hole wall of the sealing countersunk hole (42). The mounting groove (41) is provided with at least one circle of second sharp teeth (44) on the bottom surface thereof. The gasket (5) is made of soft metal and is clamped between the first sharp teeth (34) and the second sharp teeth (44). The sealing ring (7) is installed in the sealing ring mounting groove (41) and is sleeved on the first convex ring (31). The male connector (3) and the female connector (4) are fastened together. Two first side ears (35) are symmetrically provided on both sides of the male connector (3), and two second side ears (35) are symmetrically provided on both sides of the female connector (4). Side ears (45), the first side ears (35) and the second side ears (45) are fixedly connected by fasteners (8), a second convex ring (32) is provided on the end surface of the male connector (3) on the outside of the first convex ring (31), a nylon retainer (6) is fixedly installed on the second convex ring (32), a mounting ring groove (63) is provided on the inner side of the nylon retainer (6), the gasket (5) is clamped in the mounting ring groove (63), and one side thereof abuts against the first sharp tooth (34), the nylon retainer (6 ) is located in the sealing countersunk hole (42), the root of the sealing countersunk hole (42) is provided with an avoidance groove (43) for avoiding the nylon retainer (6), the connection between the second convex ring (32) and the first convex ring (31) is provided with a clamping groove (33), the inner sides of both ends of the nylon retainer (6) are provided with a first clamping ring (61) and a second clamping ring (62), the first clamping ring (61) and the second clamping ring (62) are surrounded by a mounting ring groove (63), and the first clamping ring (61) is clamped in the clamping groove (33).

2. The R744 refrigerant high-pressure air conditioning pipeline sealing flange joint according to claim 1 is characterized in that: The inner hole of the first clamping ring (61) is a tapered hole with a larger outer side, and the end of the second convex ring (32) is correspondingly provided with a chamfered conical surface.

3. The R744 refrigerant high-pressure air conditioning pipeline sealing flange joint according to claim 1 is characterized in that: The sealing ring installation groove (41) is formed by a stepped hole on the end surface of the female connector (4).

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