Leak-proof urea tube

Abstract

The utility model relates to urea pipe technical field, and disclose a kind of anti-leakage urea pipe, including urea pipe, connecting pipe, the urea pipe end integral molding is provided with extension protruding pipe A, the connecting pipe end is correspondingly provided with extension protruding pipe B with extension protruding pipe A forms plug-in cooperation;The connecting place of extension protruding pipe A and extension protruding pipe B is provided with double sealing assembly.The utility model is by polytetrafluoroethylene sealing ring and hydrogenated nitrile rubber sealing ring constitute double sealing system.Wherein, sealing ring adopts oval cross section design, when extension protruding pipe A and extension protruding pipe B plug-in, with the inner wall of connecting pipe form line contact seal, contact pressure reaches 12-15N;Sealing ring is through 0.2-0.5mm interference amount design, after tube body connection, radial compression deformation is generated, form surface contact seal.It is tested that the structure is under 3MPa pressure Leak rate≤0.1ml / min, better than the requirement of 0.5ml / min of national standard GB / T 3612-2017, realize urea solution whole-process sealing.

Description

Technical Field

[0001] This utility model relates to the field of urea tube technology, specifically to a leak-proof urea tube. Background Technology

[0002] Urea is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen. It is a white crystal and one of the simplest organic compounds. It is the main nitrogen-containing end product of protein metabolism in mammals and some fish. As a neutral fertilizer, urea is suitable for various soils and plants. It is easy to store, convenient to use, and has little destructive effect on the soil. It is a widely used chemical nitrogen fertilizer and also the nitrogen fertilizer with the highest nitrogen content. Industrially, urea is synthesized from ammonia and carbon dioxide under certain conditions.

[0003] When urea is needed, a connector is usually used to plug into the urea pipeline. However, with existing technology, it is easily affected by the external environment under long-term use, which can lead to leakage accidents and poor sealing. Utility Model Content

[0004] The purpose of this invention is to provide a leak-proof urea tube, which solves the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a leak-proof urea pipe, comprising a urea pipe and a connecting pipe, wherein an extension protrusion A is integrally formed at the end of the urea pipe, and an extension protrusion B is correspondingly provided at the end of the connecting pipe to form an insertion fit with the extension protrusion A;

[0006] The connection between the extension tube A and the extension tube B is provided with a double sealing assembly, including a sealing ring embedded in the outer wall of the extension tube A and a sealing ring sleeved on the inner wall of the extension tube B.

[0007] The outer wall of the extended convex tube A has two sets of positioning ball grooves evenly distributed circumferentially, and the inner wall of the extended convex tube B has two sets of limiting grooves correspondingly provided. Each limiting groove is connected to a positioning ball that can engage and be fixed with the positioning ball groove through an elastic reset mechanism.

[0008] The extension tube B is provided with an axially sliding locking assembly, which includes a sliding cover sleeved on the outside of the extension tube B and an elastic stop mechanism disposed between the sliding cover and the extension tube B.

[0009] The connecting pipe is equipped with a self-sealing valve mechanism, including a flow-blocking ring valve block fixedly connected to the inner wall of the connecting pipe, a valve core assembly that forms a sealing fit with the flow-blocking ring valve block, and an elastic control mechanism for controlling the opening and closing of the valve core assembly.

[0010] Preferably, in the dual sealing assembly, the sealing ring is made of polytetrafluoroethylene with an elliptical cross-section, and the sealing ring is made of hydrogenated nitrile rubber with an inner diameter that forms an interference fit with the outer diameter of the extension convex tube B.

[0011] Preferably, the elastic reset mechanism includes a reset spring disposed at the bottom of the limiting groove, one end of which is fixedly connected to the bottom surface of the limiting groove, and the other end is fixedly connected to the positioning ball.

[0012] Preferably, the inner wall of the sliding cover in the locking assembly is provided with an annular guide rail, and the outer wall of the extended convex tube B is provided with an annular guide groove to form a sliding fit; the elastic stop mechanism includes a stop spring sleeved on the outer wall of the extended convex tube B, with one end of each stop spring fixedly connected to the inner wall of the sliding cover and the other end fixedly connected to the outer wall of the extended convex tube B.

[0013] Preferably, the inner wall of the flow-blocking ring valve block in the self-sealing valve mechanism is provided with a conical sealing surface, and the valve core assembly includes a core valve stem and a valve core head disposed at the front end of the core valve stem. The outer surface of the valve core head is provided with an annular sealing band that forms line contact with the conical sealing surface.

[0014] Preferably, the elastic control mechanism includes a microspring sleeved on the outside of the valve stem. One end of the microspring is fixedly connected to the rear end face of the valve core head, and the other end is fixedly connected to a connecting ring spring body fixed to the inner wall of the connecting pipe.

[0015] Preferably, both the urea tube and the connecting tube are made of modified polyamide 66 material, and the inner surface is provided with a nano titanium dioxide antistatic coating.

[0016] This invention provides a leak-proof urea tube. It has the following beneficial effects:

[0017] (1) This utility model constitutes a dual sealing system using a polytetrafluoroethylene sealing ring and a hydrogenated nitrile rubber sealing ring. The sealing ring features an elliptical cross-section design, forming a line contact seal with the inner wall of the connecting pipe when the extended convex tube A and extended convex tube B are inserted, with a contact pressure of 12-15N. The sealing ring, with an interference fit of 0.2-0.5mm, undergoes radial compression deformation after the pipes are connected, forming a surface contact seal. Testing shows that this structure has a leakage rate ≤0.1ml / min under 3MPa pressure, which is superior to the 0.5ml / min requirement of the national standard GB / T 3612-2017, achieving full-process sealing of the urea solution.

[0018] (2) This utility model employs a dual locking mechanism of a positioning ball-reset spring and a sliding cover-stop spring. When the extension tube A is inserted into the extension tube B, the positioning ball is engaged in the positioning ball groove under the action of the reset spring (elastic coefficient 8-12N / mm), forming an axial holding force of 15-20N; the sliding cover slides along the annular guide rail through the stop spring (compression stroke 3-5mm), completely covering the tube connection and preventing loosening caused by vibration. This design reduces the assembly time to less than 15 seconds and requires no special tools, which is significantly better than the operation time of more than 30 seconds for traditional threaded connections. Attached Figure Description

[0019] Figure 1 This is a view of the overall structure of this utility model;

[0020] Figure 2 This is a cross-sectional view of the overall structure of this utility model;

[0021] Figure 3 This utility model Figure 2 A magnified view of A in the middle.

[0022] In the diagram: urea tube 21, connecting tube 22, extension protrusion A 211, extension protrusion B 221, positioning ball 222, return spring 223, sliding cover 224, stop spring 225, flow-blocking ring valve block 226, valve core head 227, micro spring 228, connecting ring spring body 229, sealing ring 31, sealing ring 32. Detailed Implementation

[0023] 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.

[0024] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] Example 1:

[0026] A preferred embodiment of the leak-proof urea pipe provided by this utility model is, for example... Figure 1-3As shown: A leak-proof urea pipe includes a urea pipe 21 and a connecting pipe 22. The end of the urea pipe 21 is integrally formed with an extension protrusion A211, and the end of the connecting pipe 22 is correspondingly provided with an extension protrusion B221 that is inserted into the extension protrusion A211.

[0027] A double sealing assembly is provided at the connection between the extension tube A211 and the extension tube B221, including a sealing ring 31 embedded in the outer wall of the extension tube A211 and a sealing ring 32 sleeved on the inner wall of the extension tube B221.

[0028] Two sets of positioning ball grooves are evenly distributed circumferentially on the outer wall of the extension tube A211, and two sets of limiting grooves are correspondingly provided on the inner wall of the extension tube B221. Each limiting groove is connected to a positioning ball 222 that can engage and be fixed with the positioning ball groove through an elastic reset mechanism.

[0029] An axially sliding locking assembly is provided on the outside of the extension tube B221. The locking assembly includes a sliding cover 224 sleeved on the outside of the extension tube B221 and an elastic stop mechanism disposed between the sliding cover 224 and the extension tube B221.

[0030] The connecting pipe 22 is equipped with a self-sealing valve mechanism, including a flow-blocking ring valve block 226 fixedly connected to the inner wall of the connecting pipe 22, a valve core assembly that forms a sealing fit with the flow-blocking ring valve block 226, and an elastic control mechanism for controlling the opening and closing of the valve core assembly 227.

[0031] Example 2:

[0032] Please see Figures 1-3 Furthermore, based on Example 1, the following is obtained: In the double sealing assembly, the sealing ring 31 is made of polytetrafluoroethylene with an elliptical cross-section, and the sealing ring 32 is made of hydrogenated nitrile rubber with an inner diameter that forms an interference fit with the outer diameter of the extension convex tube B221, and the interference amount is controlled within the range of 0.2-0.5mm.

[0033] The elastic reset mechanism includes a reset spring 223 disposed at the bottom of the limiting groove. One end of the reset spring 223 is fixedly connected to the bottom surface of the limiting groove, and the other end is fixedly connected to the positioning ball 222. The elastic coefficient of the reset spring 223 is in the range of 8-12N / mm, ensuring that the engagement force between the positioning ball 222 and the positioning ball groove reaches 15-20N.

[0034] The inner wall of the sliding cover 224 in the locking assembly is provided with an annular guide rail, and the outer wall of the extension tube B221 is provided with an annular guide groove to form a sliding fit; the elastic stop mechanism includes a stop spring 225 sleeved on the outer wall of the extension tube B221. One end of each stop spring 225 is fixedly connected to the inner wall of the sliding cover 224, and the other end is fixedly connected to the outer wall of the extension tube B221. The compression stroke of the stop spring 225 is 3-5mm.

[0035] The inner wall of the flow-blocking ring valve block 226 in the self-sealing valve mechanism is provided with a conical sealing surface. The valve core assembly includes a core valve stem and a valve core head 227 located at the front end of the core valve stem. The outer surface of the valve core head 227 is provided with an annular sealing band that forms line contact with the conical sealing surface. The width of the sealing band is 1.5-2mm and the surface roughness Ra≤0.8μm.

[0036] The elastic control mechanism includes a micro spring 228 sleeved on the outside of the core valve stem. One end of the micro spring 228 is fixedly connected to the rear end face of the valve core head 227, and the other end is fixedly connected to the connecting ring spring body 229 fixed on the inner wall of the connecting pipe 22. The elastic coefficient of the micro spring 228 is in the range of 2-4 N / mm, ensuring that the valve core head 227 maintains a sealed contact with the flow-blocking ring valve block 226 when no external force is applied.

[0037] Both the urea tube 21 and the connecting tube 22 are made of modified polyamide 66 with a wall thickness of 3-5 mm. The inner surface is coated with a nano-titanium dioxide antistatic coating 24 with a thickness of 8-12 μm and a surface resistivity controlled at 10. 6 -10 9 Ω·cm range.

[0038] In use, the extension protrusion A211 of the urea tube 21 is inserted into the extension protrusion B221 of the connecting tube 22, and the positioning ball 222 is driven by the return spring 223 to be inserted into the positioning ball groove, forming a preliminary fixation;

[0039] The sealing ring 31 contacts the inner wall of the connecting pipe 22, and at the same time, the sealing ring 32 is compressed and undergoes radial deformation to fill the gap between the extension protrusion B221 and the extension protrusion A211.

[0040] The sliding cover 224 moves along the annular guide rail 224a, the stop spring 225 is compressed by 3-5mm, and the sliding cover 224 completely covers the connection to prevent the positioning ball 222 from accidentally coming out.

[0041] When the urea solution flows through the connecting pipe 22, the fluid pressure pushes the valve core head 227 to overcome the elastic force of the micro spring 228 (elastic coefficient 2-4 N / mm), causing the annular sealing strip to separate from the conical sealing surface of the flow-blocking ring valve block 226, thereby realizing the flow on / off.

[0042] When the liquid supply stops, the micro spring 228 resets and pushes the valve core head 227 to form line contact with the conical sealing surface, with a surface roughness Ra≤0.8μm to ensure zero leakage.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A leak-proof urea pipe, comprising a urea pipe (21) and a connecting pipe (22), characterized in that: The end of the urea tube (21) is integrally formed with an extension protrusion A (211), and the end of the connecting tube (22) is correspondingly provided with an extension protrusion B (221) that is inserted into the extension protrusion A (211). The connection between the extension tube A (211) and the extension tube B (221) is provided with a double sealing assembly, including a sealing ring (31) embedded in the outer wall of the extension tube A (211) and a sealing ring (32) sleeved on the inner wall of the extension tube B (221). The outer wall of the extended protrusion A (211) is evenly distributed with two sets of positioning ball grooves along the circumference, and the inner wall of the extended protrusion B (221) is correspondingly provided with two sets of limiting grooves. Each limiting groove is connected to a positioning ball (222) that can be engaged and fixed with the positioning ball groove through an elastic reset mechanism. The extension tube B (221) is provided with an axially sliding locking assembly, which includes a sliding cover (224) sleeved on the outside of the extension tube B (221) and an elastic stop mechanism disposed between the sliding cover (224) and the extension tube B (221). The connecting pipe (22) is provided with a self-sealing valve mechanism, including a flow-blocking ring valve block (226) fixedly connected to the inner wall of the connecting pipe (22), a valve core assembly that forms a sealing fit with the flow-blocking ring valve block (226), and an elastic control mechanism for controlling the opening and closing of the valve core assembly.

2. The leak-proof urea pipe according to claim 1, characterized in that: In the dual sealing assembly, the sealing ring (31) is made of polytetrafluoroethylene and has an elliptical cross-section. The sealing ring (32) is made of hydrogenated nitrile rubber and its inner diameter is interference fit with the outer diameter of the extension convex tube B (221).

3. The leak-proof urea pipe according to claim 1, characterized in that: The elastic reset mechanism includes a reset spring (223) disposed at the bottom of the limiting groove. One end of the reset spring (223) is fixedly connected to the bottom surface of the limiting groove, and the other end is fixedly connected to the positioning ball (222).

4. The leak-proof urea pipe according to claim 1, characterized in that: The inner wall of the sliding cover (224) in the locking assembly is provided with an annular guide rail, and the outer wall of the extension tube B (221) is provided with an annular guide groove to form a sliding fit; the elastic stop mechanism includes a stop spring (225) sleeved on the outer wall of the extension tube B (221), one end of each stop spring (225) is fixedly connected to the inner wall of the sliding cover (224), and the other end is fixedly connected to the outer wall of the extension tube B (221).

5. A leak-proof urea pipe according to claim 1, characterized in that: The inner wall of the flow-blocking ring valve block (226) in the self-sealing valve mechanism is provided with a conical sealing surface. The valve core assembly includes a core valve stem and a valve core head (227) provided at the front end of the core valve stem. The outer surface of the valve core head (227) is provided with an annular sealing strip that forms a line contact with the conical sealing surface.

6. A leak-proof urea pipe according to claim 1, characterized in that: The elastic control mechanism includes a micro spring (228) sleeved on the outside of the core valve stem. One end of the micro spring (228) is fixedly connected to the rear end face of the valve core head (227), and the other end is fixedly connected to the connecting ring spring body (229) fixed on the inner wall of the connecting pipe (22).

7. A leak-proof urea pipe according to claim 1, characterized in that: The urea tube (21) and the connecting tube (22) are both made of modified polyamide 66 material, and the inner surface is provided with a nano titanium dioxide antistatic coating (24).

Images