A pipe connection structure

Abstract

The application discloses a pipeline connecting structure, which comprises a first connecting piece, a second connecting piece, a first sealing sleeve ring, a graphite packing and a second sealing sleeve ring, the second connecting piece is provided with an extended sleeve, the sleeve has a main body part and a limiting part, the limiting part is arranged on the outer periphery of the main body part, the graphite packing is arranged between the first connecting piece and the sleeve, the first sealing sleeve ring is sleeved outside the first connecting piece, the first end part of the first sealing sleeve ring extends to the space between the first connecting piece and the sleeve and presses the graphite packing, the second sealing sleeve ring is sleeved on the outer periphery of the main body part and presses the limiting part, and the first sealing sleeve ring is fixedly connected with the second sealing sleeve ring. Through the axial and radial extrusion of the graphite packing by the first sealing sleeve ring and the second sealing sleeve ring, the axial and radial sealing between the first connecting piece and the second connecting piece is realized, and the pipeline connecting structure has good sealing performance under high-temperature and high-pressure working conditions.

Description

[Technical Field]

[0001] This invention relates to the field of pipeline connection, and more specifically to a pipeline connection structure. [Background Technology]

[0002] In automotive air conditioning systems, O-rings made of plastic or rubber are commonly used as sealing components for connecting pipes to refrigerant. However, in high-temperature and high-pressure environments, O-rings often deform excessively, causing refrigerant leakage.

[0003] New refrigerants are increasingly used in automotive air conditioning systems. Their operating pressure is approximately 10 times higher than that of traditional refrigerant R134a. Due to the high operating pressure and temperature, commonly used plastic and rubber seals are no longer suitable for these new systems. Therefore, a pipe connection structure that can maintain good sealing performance under high temperature and high pressure environments is needed to meet the sealing requirements of automotive air conditioning system pipe connections. [Summary of the Invention]

[0004] The purpose of this invention is to provide a pipeline connection structure that can maintain good sealing performance under high temperature and high pressure environments.

[0005] To achieve the above objectives, the following technical solution is adopted:

[0006] A pipeline connection structure includes a first connector, a second connector, a first sealing ring, a graphite packing, and a second sealing ring. The first connector and the second connector are fixed relative to each other. The second connector has an extended sleeve. The sleeve has a main body and a limiting part. The limiting part is disposed on the outer periphery of the main body. The graphite packing is disposed between the first connector and the sleeve. The first sealing ring is sleeved on the first connector. The first end of the first sealing ring extends to the space between the first connector and the sleeve and abuts against the graphite packing. The second sealing ring is sleeved on the outer periphery of the main body and abuts against the limiting part. The first sealing ring and the second sealing ring are fixedly connected.

[0007] The first connector has an annular boss, which is disposed on the outer periphery of the first connector and is received in the sleeve. The graphite packing abuts against the annular boss.

[0008] The pipeline connection structure also includes a sealing element. The first connector is provided with a receiving groove for receiving the sealing element. The second connector has a protrusion on its surface facing the first connector. The protrusion is partially or completely received in the receiving groove and presses against the sealing element.

[0009] The receiving groove includes a first receiving groove and a second receiving groove disposed on the first connector, and the protrusion includes a first protrusion adapted to the first receiving groove and a second protrusion adapted to the second receiving groove.

[0010] The sealing element includes a first sealing element and a second sealing element. The first sealing element is received in the first receiving groove and is pressed by the first protrusion, and the second sealing element is received in the second receiving groove and is pressed by the second protrusion.

[0011] The sealing element is a metal gasket or a graphite gasket.

[0012] The first sealing collar has a radially protruding second end, and the second sealing collar has a radially protruding connecting portion. The second end and the connecting portion are provided with corresponding bolt holes, and the first sealing collar and the second sealing collar are fixedly connected by bolts.

[0013] The outer surface of the first connector is provided with external threads, and the inner surface of the first sealing collar is provided with internal threads. The first sealing collar and the first connector are fixed by threaded connection.

[0014] The outer peripheral surface of the second connector has a locking surface with a gradually increasing outer diameter along the path toward the limiting part, and the second sealing collar is sleeved on the outside of the second connector.

[0015] The first connector includes a first channel, and the second connector includes a second channel. The first channel and the second channel are in communication. The central axes of the first channel and the second channel coincide. The first sealing collar and the annular boss coincide with the central axis of the first channel, and the sleeve and the second sealing collar coincide with the central axis of the second channel.

[0016] In the above-mentioned pipeline connection structure, the second sealing collar is sleeved on the outer circumference of the sleeve and presses against the limiting part, thereby realizing the radial compression of the graphite packing by the sleeve and thus achieving radial sealing between the first connector and the second connector; the first end of the first sealing collar presses against the graphite packing to achieve axial sealing between the first connector and the second connector, and the graphite packing has good high temperature and high pressure resistance characteristics, so the pipeline connection assembly can be guaranteed to have good sealing performance under high temperature and high pressure. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a pipe connection structure according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of a pipe connection structure according to another embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional view of a pipe connection structure according to another embodiment of the present invention;

[0020] Figure 4 This is a cross-sectional view of a pipe connection structure according to another embodiment of the present invention;

[0021] Figure 5 This is a cross-sectional view of a pipe connection structure according to another embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Please refer to Figures 1 to 3 As shown, a pipe connection structure that maintains good sealing performance under high temperature and high pressure includes a first connector 1 and a second connector 2. The first connector 1 has a first channel 10 communicating with a first connecting pipe (not shown in the figure), and the second connector 2 has a second channel 20 communicating with a second connecting pipe (not shown in the figure). The first connector 1 and the second connector 2 are fixedly arranged relative to each other, and the first channel 10 and the second channel 20 are in communication. The first connecting pipe and the second connecting pipe can be sealed to the first connector 1 and the second connector 2 respectively by means of threaded connection, riveting, adhesive bonding, etc.

[0024] The second connector 2 is provided with an extended sleeve 21. The sleeve 21 has a main body and a limiting part 211. The limiting part 211 is disposed on the outer periphery of the main body. The inner diameter of the sleeve 21 is larger than the outer diameter of the first connector 1. The graphite packing 4 is disposed between the first connector 1 and the sleeve 21. The first sealing ring 3 is sleeved on the outside of the first connector 1. The first end 31 of the first sealing ring 3 extends to the space between the first connector 1 and the sealing pressure plate 21. The first end 31 of the first sealing ring 3 abuts against the graphite packing 4. The second sealing ring 5 is sleeved on the outer periphery of the sleeve main body and abuts against the limiting part 211. The first sealing ring 3 and the second sealing ring 5 are fixedly connected.

[0025] Thus, by using the second sealing ring 5 fitted around the outer periphery of the sleeve 21 extending from the second connector 2, the sleeve 21 radially compresses the graphite packing 4, thereby achieving a radial seal between the first connector 1 and the second connector 2; by using the first end 31 of the first sealing ring 3 to axially compress the graphite packing 4, an axial seal between the first connector 1 and the second connector 2 is achieved. Moreover, the graphite packing 4 has good high temperature and high pressure resistance characteristics, thus ensuring that the pipeline connection assembly has good sealing performance under high temperature and high pressure.

[0026] To achieve a better sealing effect, the first connector 1 has an annular boss 11, which is disposed on the outer periphery of the first connector 1. The annular boss 11 is housed in the sleeve 21, and the graphite packing 4 presses against the annular boss 11. In this way, the graphite packing 4 can be prevented from being exposed at the connection end face between the first connector 1 and the second connector 2, further reducing the risk of leakage of the pipeline connection assembly.

[0027] There are various ways to fix the first sealing ring 3 and the second sealing ring 5, which are not limited here. In one embodiment, the first sealing ring 3 has a radially protruding second end, and the second sealing ring 5 has a radially protruding connecting part. The second end of the first sealing ring 3 and the connecting part of the second sealing ring 5 both protrude from the limiting part 211 of the sleeve 21. The second end and the connecting part are provided with corresponding bolt holes. The first sealing ring 3 and the second sealing ring 5 are fixedly connected by bolts. By adjusting the bolts, the sealing gap between the first sealing ring 3 and the graphite packing 4 can be adjusted. By compressing the graphite packing 4, it squeezes the first connecting member 1, thereby achieving a good axial sealing effect.

[0028] There are multiple ways to connect the first sealing collar 3 and the first connecting member 1, which are not limited here. In one embodiment, the outer surface of the first connecting member 1 is provided with an external thread, and the inner surface of the first sealing collar 3 is provided with an internal thread. The first sealing collar 3 and the first connecting member 1 are fixed by threaded connection.

[0029] There are multiple ways to connect the second sealing collar 5 and the second connecting member 2, which are not limited here. In one embodiment, the outer peripheral surface of the second connecting member 2 is provided with a locking surface with a gradually increasing outer diameter on the path toward the limiting part 211, and the second sealing collar 5 is fixedly sleeved on the outside of the second connecting member 2 through the locking surface.

[0030] Please refer to Figure 4 and 5As shown, in another embodiment, the pipeline connection structure further includes a sealing element 6. The first connector 1 is provided with a receiving groove for receiving the sealing element 6. The second connector 2 is provided with a protrusion 7 on its surface facing the first connector 1 and is received in the receiving groove. The protrusion 7 is partially or completely received in the receiving groove and presses against the sealing element 6.

[0031] To achieve a better sealing effect, two seals 6 can be provided, including a first seal 61 and a second seal 62. In this case, the receiving groove includes a first receiving groove and a second receiving groove provided at the end of the first connector 1. Correspondingly, the protrusion 7 is configured as a first protrusion 71 that is adapted to the first receiving groove and a second protrusion 72 that is adapted to the second receiving groove.

[0032] During assembly, the first sealing member 61 is housed in the first receiving groove and pressed against by the first protrusion 71, and the second sealing member 62 is housed in the second receiving groove and pressed against by the second protrusion 72, so as to ensure the reliability of the seal.

[0033] The cross-sectional shape of the protrusion 7 is substantially the same as that of the receiving groove, so as to ensure that after the seal 6 is pressed and received in the receiving groove, the protrusion 7 can provide a stable pressure, so that the seal 6 will not be affected by the shaking or displacement of the protrusion 7 and thus the reliability of the seal will not be affected.

[0034] The sealing element 6 is a metal gasket or a graphite gasket.

[0035] Metal gaskets, compared to traditional plastic and rubber seals, have higher resistance to high temperature and high pressure, thus ensuring good sealing performance in high temperature and high pressure environments.

[0036] Graphite gaskets can be made from high-purity graphite or a mixture of high-purity graphite and polymer or metallic materials. They feature low leakage, low stress relaxation, and high resilience compensation, making them reusable. Furthermore, graphite's high-temperature resistance ensures excellent sealing performance under high-temperature and high-pressure environments.

[0037] Using the aforementioned metal or graphite gaskets can further improve the sealing performance of the pipeline connection assembly under high temperature and high pressure environments, effectively preventing refrigerant leakage.

[0038] To further ensure the sealing effect of the pipeline connection components, the central axes of the first channel 10 and the second channel 20 can be set to coincide, the first sealing ring 3 and the annular boss 11 coincide with the central axis of the first channel 10, and the sleeve 21 and the second sealing ring 5 coincide with the central axis of the second channel 20.

[0039] It should be noted that although this specification has described the present invention in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify, combine or make equivalent substitutions to the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A pipe connection structure, characterized in that, The device includes a first connector (1), a second connector (2), a first sealing ring (3), a graphite packing (4), and a second sealing ring (5). The first connector (1) and the second connector (2) are fixed relative to each other. The second connector (2) is provided with an extended sleeve (21). The sleeve (21) has a main body and a limiting part (211). The limiting part (211) is disposed on the outer periphery of the main body. The graphite packing (4) is disposed between the first connector (1) and the sleeve (21). The first sealing ring (3) is sleeved on the outside of the first connector (1). The first end (31) of the first sealing ring (3) extends to the space between the first connector (1) and the sleeve (21). The first end (31) of the first sealing ring (3) presses against the graphite packing (4). The second sealing ring (5) is sleeved on the outer periphery of the main body and presses against the limiting part (211). The first sealing ring (3) and the second sealing ring (5) are fixedly connected.

2. The pipeline connection structure according to claim 1, characterized in that, The first connector (1) has an annular boss (11), which is disposed on the outer periphery of the first connector (1). The annular boss (11) is received in the sleeve (21), and the graphite packing (4) presses against the annular boss (11).

3. The pipeline connection structure according to claim 1, characterized in that, The pipeline connection structure also includes a sealing element (6). The first connector (1) is provided with a receiving groove for receiving the sealing element (6). The second connector (2) is provided with a protrusion (7) on its surface facing the first connector (1). The protrusion (7) is partially or completely received in the receiving groove and presses against the sealing element (6).

4. The pipeline connection structure according to claim 3, characterized in that, The receiving groove includes a first receiving groove and a second receiving groove disposed on the first connector (1), and the protrusion includes a first protrusion (71) adapted to the first receiving groove and a second protrusion (72) adapted to the second receiving groove.

5. The pipeline connection structure according to claim 4, characterized in that, The sealing element (6) includes a first sealing element (61) and a second sealing element (62). The first sealing element (61) is received in the first receiving groove and is pressed by the first protrusion (71). The second sealing element (62) is received in the second receiving groove and is pressed by the second protrusion (72).

6. The pipeline connection structure according to any one of claims 3 to 5, characterized in that, The sealing element (6) is a metal gasket or a graphite gasket.

7. The pipeline connection structure according to claim 2, characterized in that, The first sealing ring (3) has a radially protruding second end, and the second sealing ring (5) has a radially protruding connecting part. The second end and the connecting part are provided with corresponding bolt holes. The first sealing ring (3) and the second sealing ring (5) are fixedly connected by bolts.

8. The pipeline connection structure according to claim 1, characterized in that, The outer surface of the first connector (1) is provided with external threads, and the inner surface of the first sealing ring (3) is provided with internal threads. The first sealing ring (3) and the first connector (1) are fixed by threaded connection.

9. The pipeline connection structure according to claim 1, characterized in that, The outer periphery of the second connector (2) has a locking surface with a gradually increasing outer diameter along the path toward the limiting part (211), and the second sealing collar (5) is sleeved on the outside of the second connector (2).

10. The pipeline connection structure according to claim 2, characterized in that, The first connector includes a first channel (10), the second connector includes a second channel (20), the first channel (10) and the second channel (20) are connected, the central axes of the first channel (10) and the second channel (20) coincide, the first sealing ring (3) and the annular boss (11) coincide with the central axis of the first channel (10), and the sleeve (21) and the second sealing ring (5) coincide with the central axis of the second channel (20).

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