A double-sealed structure for quick-connect couplings in urea pipelines

Abstract

This utility model discloses a double-sealing structure for a quick-connect coupling in urea pipelines, specifically relating to the field of urea pipeline technology. It includes a connecting pipe with a threaded connection to its outer wall. A guiding double-sealing assembly is provided on one side of the connecting pipe. The guiding double-sealing assembly includes: a rotating ring on one side of the connecting pipe, threadedly connected to the connecting pipe; and a pressure sleeve fixed to the outer wall of the rotating ring. A sealing outer gasket is provided on one side of the pressure sleeve and fixedly connected to the connecting pipe. An inner gasket is installed on the inner wall of the sealing outer gasket. This utility model uses a guiding double-sealing assembly to close the threaded connection between the connecting pipe and the connecting pipe. The guiding surface and chamfered surface of the inner wall of the pressure sleeve engage in compression, and the rotating ring compresses and contacts the inner gasket to achieve a seal. This external guiding and compressive compression not only results in a larger sealing contact area but also a superior sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of urea pipeline technology, and more specifically, to a double-sealed structure for a quick-connect urea pipeline. Background Technology

[0002] In the urea nozzle device of the SCR system, the double-seal structure of the urea pipeline quick connector mainly serves to prevent urea leakage and ensure stable system operation. The main function is that the inner O-ring directly contacts the urea fluid to prevent it from leaking out from the pipeline connection; the outer O-ring isolates the ambient air to prevent external impurities from entering the pipeline, and at the same time prevents the seal from failing due to urea volatilization or crystallization.

[0003] Among existing publicly available documents, patent publication number CN202972266U discloses a double-movable joint pipeline sealing structure. This technology uses an outer nut placed outside the movable joint, with the outer nut and the movable sleeve connected by threads. The advantages of this invention are: it allows for pipeline connections within a small space, without affecting the installation of aero-engines and aircraft accessory housings; it also possesses a certain degree of compensation and coordination capability, reducing the requirements for pipeline installation and manufacturing precision. However, this technology still has the following problems.

[0004] During the double sealing process of urea pipeline quick couplings, the direct butt joint compression to form a seal makes it difficult to create a large external guided compression seal at the sealing compression point. This results in a small sealing contact area and a poor sealing effect. Utility Model Content

[0005] To overcome the aforementioned deficiencies of the prior art, this utility model provides the following technical solution: a double-sealed structure for a urea pipeline quick connector, comprising a connecting pipe, wherein a connecting tube is threaded to the outer wall of the connecting pipe, and a guide double-sealing assembly is provided on one side of the connecting tube, the guide double-sealing assembly comprising:

[0006] A swivel ring, one side of the connecting pipe, is threadedly connected to the butt pipe;

[0007] A pressure sleeve is fixed to the outer wall of the rotating ring. A sealing gasket is provided on one side of the pressure sleeve, and the sealing gasket is fixedly connected to the connecting pipe. An inner gasket is installed on the inner wall of the sealing gasket.

[0008] A chamfered surface is formed on one end of the sealing gasket, and the pressure sleeve is used to guide and press against the outer wall of the sealing gasket along the chamfered surface.

[0009] In a preferred embodiment, an annular gap is provided between the pressure sleeve and the connecting pipe, and the vertical cross-sectional shape of the pressure sleeve is annular.

[0010] In a preferred embodiment, the vertical cross-sectional area of ​​the connecting pipe is larger than the vertical cross-sectional area of ​​the inner pad, and the outer wall of the chamfered surface is set as a smooth surface.

[0011] In a preferred embodiment, both the outer and inner sealing gaskets are made of rubber, and the inner gasket is fixedly connected to the connecting pipe.

[0012] In a preferred embodiment, the outer wall of the pressure sleeve is provided with a plurality of friction grooves, which are arranged in a circumferential distribution.

[0013] In a preferred embodiment, the inner wall of the pressure sleeve is provided with a guide surface, which is used to press the outer wall of the chamfered surface.

[0014] In a preferred embodiment, the outer sealing gasket is provided with a sealing outer ring, and a support ring is fixedly connected to the outer wall of the sealing outer ring;

[0015] A reinforcing ring is fixed to the outer wall of the connecting pipe at a position on the side of the sealing outer gasket. An end gasket is fixed between the reinforcing ring and the support ring. The outer wall of the pressure sleeve is used to move and contact the inner wall of the sealing outer ring.

[0016] The technical effects and advantages of this utility model are as follows:

[0017] 1. This utility model adopts a guided double sealing assembly, which connects the butt joint pipe and the connecting pipe with a threaded connection. The pressure sleeve drives the rotating ring to rotate. The guide surface and the chamfer surface of the inner wall of the pressure sleeve cooperate and squeeze. The pressure sleeve drives the rotating ring to move to the left. The rotating ring squeezes and contacts the inner gasket to complete the contact seal. At the same time, the inner wall of the pressure sleeve and the outer wall of the sealing outer gasket form a squeeze and fit seal, realizing external guided cooperation and squeezing. This not only results in a larger sealing contact area, but also a better sealing effect.

[0018] 2. This utility model uses the outer wall of the pressure sleeve to press against the inner wall of the sealing outer ring, the reinforcing ring supports the end pad, the end pad supports the support ring, and the end of the pressure sleeve is pressed against the end pad to form a sealing state, ensuring that the end of the pressure sleeve and the outside are sealed and connected again, resulting in a better sealing effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the double-sealed quick connector for urea pipelines according to this utility model.

[0020] Figure 2 This is a schematic diagram of the vertical cross-section of the double-sealed structure of the urea pipeline quick connector of this utility model.

[0021] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0022] Figure 4 This is a partial structural diagram of the guide surface of this utility model.

[0023] The attached figures are labeled as follows: 1. Connecting pipe; 2. Connecting tube; 3. Rotary ring; 4. Pressure sleeve; 5. Sealing outer gasket; 6. Inner gasket; 7. Chamfered surface; 8. Friction groove; 9. Sealing outer ring; 10. Support ring; 11. End gasket; 12. Reinforcing ring; 13. Guide surface. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1 - Figure 4 The diagram shows a double-sealed structure for a quick-connect coupling in a urea pipeline. This double-sealed structure is equipped with a guide double-sealing component. The guide double-sealing component enables external guiding and compression, resulting in a larger sealing contact area and a superior sealing effect. The specific structural configuration of the guide double-sealing component is as follows.

[0026] In this embodiment, as Figure 1 - Figure 2 As shown, a connecting pipe 2 is threadedly connected to the outer wall of the connecting pipe 1. A guide double-seal assembly is provided on one side of the connecting pipe 2. The guide double-seal assembly includes: a rotating ring 3 on one side of the connecting pipe 2, which is threadedly connected to the connecting pipe 1; a pressure sleeve 4 fixed to the outer wall of the rotating ring 3, with a sealing outer gasket 5 on one side of the pressure sleeve 4, and the sealing outer gasket 5 is fixedly connected to the connecting pipe 2. An inner gasket 6 is installed on the inner wall of the sealing outer gasket 5; and a chamfered surface 7 on one end of the sealing outer gasket 5, which the pressure sleeve 4 is used to guide and press against the outer wall of the sealing outer gasket 5 along the chamfered surface 7. An annular gap is provided between the pressure sleeve 4 and the connecting pipe 1, and the vertical cross-sectional shape of the pressure sleeve 4 is annular. The vertical cross-sectional area of ​​the connecting pipe 1 is larger than the vertical cross-sectional area of ​​the inner gasket 6, and the outer wall of the chamfered surface 7 is a smooth surface. Both the sealing outer gasket 5 and the inner gasket 6 are made of rubber, and the inner gasket 6 is fixedly connected to the connecting pipe 2.

[0027] In this embodiment, as Figure 2 As shown, the outer wall of the pressure sleeve 4 is provided with multiple friction grooves 8, which are arranged in a circular pattern. The friction grooves 8 provide greater contact friction to the hand, making the rotation of the pressure sleeve 4 more stable and preventing slippage.

[0028] In this embodiment, as Figure 4As shown, the inner wall of the pressure sleeve 4 is provided with a guide surface 13, which is used to press the outer wall of the chamfered surface 7. By cooperating and pressing the guide surface 13 on the inner wall of the pressure sleeve 4 with the chamfered surface 7, a quick mating and connection can be achieved.

[0029] In use, the double-seal structure of the quick-connect urea pipeline is achieved by threading the connecting pipe 1 and the connecting pipe 2 together. The user then holds the pressure sleeve 4 on its outer wall, using the friction groove 8 to provide significant contact friction. This causes the pressure sleeve 4 to rotate the rotating ring 3. Under the action of the threaded engagement force, the rotating ring 3 and the connecting pipe 1 move to the left. The rotating ring 3 also moves the pressure sleeve 4 to the left, causing the guide surface 13 and the chamfered surface 7 of the inner wall of the pressure sleeve 4 to engage and press against each other. Simultaneously, the inner wall of the pressure sleeve 4 presses against the outer wall of the sealing gasket 5, and the pressure sleeve 4 drives the rotating ring 3 to move to the left. The rotating ring 3 then presses against the inner gasket 6 to complete the contact seal. At the same time, the inner wall of the pressure sleeve 4 and the outer wall of the sealing gasket 5 form a press-fit seal. The outer wall of the sealing gasket 5 and the inner wall of the pressure sleeve 4 also match in area, thus achieving external guiding and pressing, increasing the external sealing force of the connecting pipe 2 and increasing the external pressing and sealing area.

[0030] In this embodiment, as Figure 3 As shown, the outer sealing gasket 5 is provided with a sealing outer ring 9, and a support ring 10 is fixedly connected to the outer wall of the sealing outer ring 9; a reinforcing ring 12 is fixed on the outer wall of the connecting pipe 2 and located on one side of the sealing outer gasket 5, and an end gasket 11 is fixed between the reinforcing ring 12 and the support ring 10; the outer wall of the pressure sleeve 4 is used to move and contact the inner wall of the sealing outer ring 9.

[0031] When this technology is used, when the inner wall of the pressure sleeve 4 is pressed against the outer wall of the sealing outer gasket 5, the outer wall of the pressure sleeve 4 is pressed against the inner wall of the sealing outer ring 9. The reinforcing ring 12 is supported by the connecting pipe 2, the reinforcing ring 12 supports the end gasket 11, and the end gasket 11 supports the support ring 10. Thus, the sealing outer ring 9 can fit and connect with the outer wall of the pressure sleeve 4, and the end of the pressure sleeve 4 is pressed against the end gasket 11 to form a sealing state. At the same time, the connecting pipe 2 supports the reinforcing ring 12, and the reinforcing ring 12 supports the end gasket 11.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-sealed quick-connector structure for urea pipelines, comprising a connecting pipe (1), wherein a connecting pipe (2) is threadedly connected to the outer wall of the connecting pipe (1), characterized in that: One side of the connecting pipe (2) is provided with a guide double sealing assembly, the guide double sealing assembly comprising: A swivel (3) is connected to one side of a connecting pipe (2), and the swivel (3) is threadedly connected to the connecting pipe (1); A pressure sleeve (4) is fixed on the outer wall of the rotating ring (3). A sealing gasket (5) is provided on one side of the pressure sleeve (4), and the sealing gasket (5) is fixedly connected to the connecting pipe (2). An inner gasket (6) is installed on the inner wall of the sealing gasket (5). A chamfered surface (7) is formed on one end of the sealing gasket (5), and the pressure sleeve (4) is used to guide and press against the outer wall of the sealing gasket (5) along the chamfered surface (7).

2. The double-sealed structure of a quick-connect coupling for urea pipelines according to claim 1, characterized in that: An annular gap is provided between the pressure sleeve (4) and the connecting pipe (1), and the vertical cross-section of the pressure sleeve (4) is annular.

3. The double-sealed structure of a quick-connect coupling for urea pipelines according to claim 1, characterized in that: The vertical cross-sectional area of ​​the connecting pipe (1) is greater than that of the inner pad (6), and the outer wall of the chamfered surface (7) is set as a smooth surface.

4. The double-sealed structure of a quick-connect coupling for urea pipelines according to claim 1, characterized in that: Both the outer sealing gasket (5) and the inner gasket (6) are made of rubber, and the inner gasket (6) is fixedly connected to the connecting pipe (2).

5. The double-sealed structure of a quick-connect coupling for urea pipelines according to claim 1, characterized in that: The outer wall of the pressure sleeve (4) is provided with a plurality of friction grooves (8), which are arranged in a circular pattern.

6. The double-sealed structure of a quick-connect coupling for urea pipelines according to claim 1, characterized in that: The inner wall of the pressure sleeve (4) is provided with a guide surface (13), which is used to press the outer wall of the chamfered surface (7).

7. The double-sealed structure of a quick-connect coupling for urea pipelines according to claim 1, characterized in that: The outer sealing gasket (5) is provided with a sealing outer ring (9), and a support ring (10) is fixedly connected to the outer wall of the sealing outer ring (9). A reinforcing ring (12) is fixed on the outer wall of the connecting pipe (2) and at a position on one side of the sealing outer gasket (5). An end gasket (11) is fixed between the reinforcing ring (12) and the support ring (10). The outer wall of the pressure sleeve (4) is used to move and contact the inner wall of the sealing outer ring (9).

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