A quick-connect fitting for a compression-sealed pipeline

Abstract

The present invention discloses a quick-installation joint for a compression-sealed pipeline, which includes a joint body. The outer wall of the interface end of the joint body is provided with an external thread of the joint, and an annular groove concave inward from the end face is provided between the inner and outer walls. A locking nut is threadedly connected to the external thread of the joint. An inner sealing sleeve, a sealing positioning sleeve and an outer sealing member are arranged between the annular groove and the locking nut. The inner end of the sealing positioning sleeve sleeves the outer end of the inner sealing sleeve, and the outer end sleeves the outer sealing member therein. The inner end of the inner sealing sleeve is positioned in the annular groove. A disc spring is arranged between the outer end of the inner sealing sleeve and the sealing positioning sleeve. When the locking nut is tightened, the inner sealing sleeve, the sealing positioning sleeve and the outer sealing member are axially displaced, causing the inner sealing sleeve, the disc spring and the outer sealing member to generate a diameter reduction deformation. The quick-installation joint for a compression-sealed pipeline provided by the present invention does not require the pipeline to be inserted into the joint body. It adopts compression sealing, and the locking nut is used for fixed clamping. It is convenient for installation and disassembly, and has good interchangeability; it has good safety and sealing performance and can withstand greater pressure.

Description

Technical Field

[0001] The present invention relates to a quick-install pipe joint, specifically a compression-sealed quick-install pipe joint. Background Art

[0002] The prior art discloses a quick-install pipe connection structure. Its sealing principle is that the nut seals the pipe through the rear seal and the front seals the joint body through the front O-ring, thereby realizing the sealing between the pipe and the joint body. When the nut rotates, it is necessary to overcome the frictional resistance of the rear seal. Since the friction coefficient of rubber is high, the resistance to nut rotation is increased. The sealing principle of the rear seal is pre-set sealing. When the pipe is inserted into the joint, the outer circumferential surface of the pipe is initially pressed. Since it is necessary to ensure the sealing performance, the extrusion coefficient is relatively large. During actual installation, lubricating oil needs to be applied to the pipe port to insert the pipe into the joint. When the pre-set seal scratches or deforms on the pipe surface, the situation of unable to seal will occur. The disc spring has a bearing surface and an inner ring. Relying on the elastic force of the disc spring itself, it eats into the pipe. It cannot adjust self-concentrically, cannot penetrate deeply and cannot evenly eat into the pipe. When the outer diameter deviation of the pipe is large or deformed, the situation of failure will occur.

[0003] Therefore, how to solve the above problems has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides a compression-sealed quick-install pipe joint, which adopts compression sealing and the locking nut fixes the clamping mechanism. After the locking nut is loosened, the pipe can be easily pulled out, with convenient installation and disassembly and good interchangeability; it has good safety and sealing performance and can withstand greater pressure.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A compression-sealed quick-install pipe joint includes a joint body. The outer wall of the interface end of the joint body is provided with an external thread of the joint, and an annular groove recessed inward from the end face is provided between the inner and outer walls. A locking nut is threadedly connected to the external thread of the joint.

[0007] An inner seal sleeve, a seal positioning sleeve and an outer seal are provided between the annular groove and the locking nut.

[0008] The inner end of the seal positioning sleeve sleevs the outer end of the inner seal sleeve, and the outer end sleevs the outer seal therein.

[0009] The inner end of the inner seal sleeve is positioned in the annular groove.

[0010] A disc spring is provided between the outer end of the inner seal sleeve and the seal positioning sleeve.

[0011] When the locking nut is tightened, it squeezes the inner seal sleeve, the seal positioning sleeve and the outer seal to move axially, causing the inner seal sleeve, the disc spring and the outer seal to generate a diameter reduction deformation.

[0012] One end of the inner sealing sleeve of the above-mentioned compression-sealed pipe quick connector extends into the above-mentioned annular groove and is sealed with each other. The outer seal presses and seals against the outer circumferential surface of the pipe. As the nut is screwed in, the outer seal shrinks radially. The nut is provided with an internal thread that mates with the external thread of the connector body on the connector main body. The compression-sealed design can be applied to pipes with different outer diameter deviations and can achieve good sealing performance. Since the outer seal uses a compression seal, the initial extrusion of the inner ring against the pipe is small. After unscrewing the nut, the pipe can be easily inserted into or pulled out of the connector. As the locking nut is tightened, the disc spring generates a diameter-reducing deformation to clamp the pipe.

[0013] Furthermore, an extrusion ring is provided between the outer seal and the nut step surface of the locking nut. The extrusion ring is provided with extrusion protrusions and end face grooves. The surface where the end face groove is located abuts against the nut step surface of the locking nut. One end of the outer seal that is pressed against the extrusion ring is provided with an extrusion inclined surface adapted to the extrusion protrusion. The end face groove of the extrusion ring makes the force applied by the locking nut on the end face of the extrusion ring spread more evenly around. The end face groove can also reduce the contact area with the nut step surface and reduce the frictional resistance of the nut rotation. The extrusion protrusion of the extrusion ring and the extrusion inclined surface on the outer seal are closely attached to form a wedge structure. When the locking nut is tightened, the extrusion protrusion presses the outer seal, forcing the inner ring of the outer seal to radially contract inward to press against the outer circumferential surface of the pipe.

[0014] Furthermore, the sealing and positioning sleeve and the pressed end of the outer seal are respectively provided with an end face protrusion and an end face concave. The end face protrusion of the sealing and positioning sleeve and the end face concave of the outer seal cooperate to form a self-sealing air chamber. When the pipe is sealed, the fluid will fill into the self-sealing air chamber. According to the formula F = P*S, the self-sealing air chamber forms a large pressure area. The greater the fluid pressure, the tighter the outer seal presses the pipe, and the better the sealing performance.

[0015] Furthermore, a main body O-ring seal is provided between one end of the outer wall of the inner sealing sleeve and the inner wall of the annular groove, and a seal sleeve O-ring seal is provided between the other end of the outer wall of the inner sealing sleeve and the inner wall of the sealing and positioning sleeve. The sealing principle of the entire quick connector is that the front end of the inner sealing sleeve is sealed with the connector main body, the rear end is sealed with the sealing and positioning sleeve, and the other end of the sealing and positioning sleeve is sealed with the pipe, ultimately realizing the sealing between the pipe and the connector main body.

[0016] Furthermore, a positioning sleeve inclined surface is provided at the contact end of the inner sealing sleeve and the disc spring to position the disc spring. The disc spring is sleeved between the inner and outer walls of the sealing and positioning sleeve. The disc spring has pointed teeth that bite into the surface of the pipe. The pointed teeth can penetrate and evenly bite into the pipe. When the outer diameter deviation of the pipe is large or the pipe is deformed, it will not fail.

[0017] Furthermore, the disc spring is provided with a disc spring strengthening groove, an outer ring, an outer ring notch, an inner ring, an inner ring extension section and an inner ring notch; the pointed teeth are located on the inner ring extension section; the included angle between the inner ring extension section and the end face is greater than the included angle between the inner ring and the end face.

[0018] Furthermore, the contact end of the sealing and positioning sleeve with the disc spring is provided with a disc spring inner ring positioning surface and a disc spring bearing inclined surface; the outer ring is in close contact with the inner wall of the sealing and positioning sleeve, and the inner ring is in close contact with the disc spring inner ring positioning surface; the inner ring extension section is pressed on the disc spring bearing inclined surface.

[0019] Furthermore, the contact end of the sealing and positioning sleeve with the disc spring is provided with a disc spring axial positioning column, and the disc spring axial positioning column passes through the outer ring notch of the disc spring. The disc spring is positioned by the disc spring axial positioning column.

[0020] Furthermore, a disc spring strengthening pad is arranged in the disc spring strengthening groove. The disc spring strengthening pad has a positioning hole and a positioning protrusion. The positioning hole is sleeved in the disc spring axial positioning column on the sealing and positioning sleeve, and the positioning protrusion is located in the outer ring notch on the disc spring.

[0021] The disc spring is sleeved in the sealing and positioning sleeve. The outer ring is in close contact with the inner wall of the disc spring, the inner ring is in close contact with the disc spring inner ring positioning surface, and the outer ring notch passes through the disc spring axial positioning column, so that the disc spring will not rotate with the pipeline. The pointed teeth can bite into the pipe more easily and evenly. The included angle C1 between the inner ring extension section and the end face is greater than the included angle C2 between the inner ring and the end face. The angle at which the pointed teeth bite into the pipeline is closer to the radial direction of the pipeline. The pointed teeth can bite deeper under the pushing pressure of the rotating lock nut and can withstand the pulling force generated by the fluid with greater pressure.

[0022] The disc spring strengthening pad is placed in the disc spring strengthening groove on the disc spring. The positioning hole is sleeved in the disc spring axial positioning column on the sealing and positioning sleeve, and the positioning protrusion passes through the outer ring notch on the disc spring. The disc spring is positioned and the strength between the inner and outer rings is increased. The disc spring and the sealing and positioning sleeve form a component to realize modular assembly.

[0023] The step surface of the nut abuts against the surface where the end face groove of the extrusion ring is located. During the process of screwing into the joint body, the nut pushes the extrusion ring, the extrusion ring pushes the outer seal and the sealing and positioning sleeve, the sealing and positioning sleeve pushes the disc spring, and the inner ring extension section on the disc spring abuts against the positioning sleeve inclined surface on the inner seal sleeve and radially contracts, and the pointed teeth bite into the pipeline. As the nut is continuously screwed in, the included angle between the inner ring extension section and the end face remains unchanged, the inner ring closely adheres to the disc spring inner ring positioning surface and the height value becomes smaller and smaller, the pointed teeth bite deeper until the inner ring extension section completely abuts against the disc spring bearing inclined surface, and both the disc spring bearing inclined surface and the inner wall of the disc spring inner ring positioning surface abut against the outer circumferential surface of the pipeline. The sealing and positioning sleeve can assist in pressing the toothed disc spring to withstand the pulling force generated by the fluid pressure. It can withstand greater pressure. After repeated tests, when the fluid pressure is 3.0 MPa, the compression of the disc spring does not fail, the sealing performance is good, and no leakage is found.

[0024] Further, the disc spring is replaced by a buckle and a buckle positioning seat. There are two symmetrical buckles, which are elastically installed on the outer cylindrical surface of the buckle positioning seat. There are two symmetrical pipeline through holes on the outer cylindrical surface of the pipeline end. The outer ring of the buckle positioning seat is sleeved and positioned on the inner wall of the sealing positioning sleeve. When the locking nut is tightened, the buckle radially contracts and is buckled into the pipeline through hole. When the buckle is buckled into the pipeline through hole, the locking is reliable and the situation of failure will not occur.

[0025] Further, a long hole surrounding the outer cylindrical surface is provided on the cylindrical surface of the buckle positioning seat. Buckle elastic pieces are provided on both sides of the long hole, and a lug is provided on one end face. One end of the buckle is pressed on the lug. The buckle is provided with a radially inward protrusion, and the radially inward protrusion passes through the long hole on the cylindrical surface of the buckle positioning seat, and the inner wall abuts against the buckle elastic piece.

[0026] Further, buckle positioning protrusions and bayonet grooves are provided on the inner wall of the sealing positioning sleeve. A clamping groove piece is axially provided on the buckle positioning seat. The lug of the buckle positioning seat is between the two buckle positioning protrusions, and the axially clamping groove piece is clamped in the bayonet groove.

[0027] The buckle is provided with an inclined surface, and a positioning sleeve inclined surface is provided at the contact end of the inner sealing sleeve and the buckle to press the inclined surface of the buckle. When the locking nut is tightened, the sealing positioning sleeve is axially pushed. Under the action of the positioning sleeve inclined surface, the inclined surface of the buckle causes the buckle to radially contract and be buckled into the pipeline through hole.

[0028] Further, the end face of the interface end of the joint body abuts against the end face of the pipeline. The pipeline is not inserted into the joint body, which is convenient for the pipeline system to disassemble and install a single joint. When replacing the joint, it is not necessary to disassemble the whole pipeline or perform destructive disassembly on the joint to be replaced.

[0029] Further, an inner ring groove is provided on the inner wall of the outer seal. The inner ring groove can prevent the inner ring from wrinkling during radial contraction and affecting the sealing performance.

[0030] The present invention has the following technical advantages compared with the prior art:

[0031] 1. The compression seal adopts the axial compression seal by tightening the locking nut. The initial compression of the inner ring on the pipeline is small. After the locking nut is loosened, the pipeline can be easily inserted and pulled out.

[0032] 2. After the locking nut is tightened, the inner ring will radially contract. For the situation where the outer diameter deviation of the pipeline is relatively large and the surface of the pipe is scratched, good sealing performance can be ensured.

[0033] 3. When the locking nut rotates, the fitting in contact with the step surface of the locking nut is provided with a groove, and the locking nut is not in direct contact with the outer seal. The resistance received by the locking nut is very small, and the locking nut can be easily loosened or tightened.

[0034] 4. During installation, simply loosen the lock nut, and the pipeline can be easily inserted into the joint. When disassembling, loosen the lock nut by two or three threads, and the pipeline can be pulled out from the joint. It is convenient for installation and quick for disassembly;

[0035] 5. The pipeline is not inserted into the joint body, which is convenient for the pipeline system to disassemble and install a single joint. When replacing the joint, it is not necessary to disassemble the whole pipeline or conduct destructive disassembly on the joint to be replaced;

[0036] 6. The outer seal and the seal positioning sleeve cooperate to form a self-sealing air chamber. When there is fluid in the pipeline, the fluid will fill the self-sealing air chamber. According to the formula: pressure = pressure * force area (F = PS), the self-sealing air chamber forms a relatively large area. The greater the fluid pressure, the tighter the silicone seal squeezes the pipeline, and the better the sealing performance;

[0037] 7. The disc spring has an inner ring extension section and an outer ring added on the basis of only the bearing surface and the inner ring in the existing technology. There are sharp teeth on the inner ring extension section, which is easier to bite into the pipeline under the push of the lock nut, and can bite into the pipe deeply and evenly, ensuring the reliability of the locking structure fixed to the pipeline and being able to withstand the pulling force generated by greater fluid pressure;

[0038] 8. The disc spring can still bite into the pipe evenly even when the outer diameter of the pipe has a large deviation or the pipe is not round, and at the same time, it can avoid destructive failure deformation when the pressure is too large, resulting in unusability. After repeated tests, the test fluid pressure is 30 kg / cm 2 , and after repeated tests, no disc spring failure or joint loosening was found;

[0039] 9. The buckle of the buckle locking structure radially protrudes inwards and buckles into the hole opened on the pipeline. It has good stability and can withstand large fluid pressure. When the lock nut is tightened, the buckle buckles in. When the lock nut is loosened, the buckle automatically pops out. It is convenient for installation and quick for disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a single-sided cross-sectional view of the first embodiment of the present invention;

[0041] Figure 2 is a perspective view of the first embodiment of the present invention;

[0042] Figure 3 is a complete cross-sectional view of the first embodiment of the present invention;

[0043] Figure 4 is a cross-sectional view of the joint body of the first embodiment of the present invention;

[0044] Figure 5 is an exploded view of the inner seal sleeve of the first embodiment of the present invention;

[0045] Figure 6 This is the complete explosion diagram of the first embodiment of the present invention;

[0046] Figure 7 This is the explosion diagram of the locking structure of the first embodiment of the present invention;

[0047] Figure 8 This is the sectional exploded view of the locking structure of the first embodiment of the present invention;

[0048] Figure 9 This is the sectional exploded view of the sealing structure of the first embodiment of the present invention;

[0049] Figure 10 This is the sectional view of the sealing structure of the first embodiment of the present invention;

[0050] Figure 11 This is the three-dimensional view of the sealing positioning sleeve of the first embodiment of the present invention;

[0051] Figure 12 This is the three-dimensional view of the disc spring of the first embodiment of the present invention;

[0052] Figure 13 This is the schematic diagram of the disc spring contraction of the first embodiment of the present invention;

[0053] Figure 14 This is the schematic diagram of the disc spring engagement of the first embodiment of the present invention;

[0054] Figure 15 This is the single-sided sectional view of the second embodiment;

[0055] Figure 16 This is the overall assembly sectional view of the second embodiment;

[0056] Figure 17 This is the explosion diagram of the snap locking structure of the second embodiment;

[0057] Figure 18 This is the auxiliary sectional view of the snap locking structure of the second embodiment;

[0058] Figure 19 This is the comparison schematic diagram of the snap-in and spring-up of the snap locking structure of the second embodiment.

[0059] In the figure: joint body A, external thread A1 of the joint, annular groove A2, inner seal sleeve 1, main body O-ring groove 1a, seal sleeve O-ring groove 1b, positioning sleeve inclined surface 1c, main body O-ring 2, seal sleeve O-ring 3, seal and positioning sleeve 4, end face protrusion 41, inner ring positioning surface 42 of the disc spring, disc spring bearing inclined surface 43, disc spring axial positioning column 44, buckle positioning protrusion 45, bayonet groove 46, disc spring 5, disc spring strengthening groove 51, outer ring 52, outer ring notch 53, inner ring 54, inner ring extension section 55, inner ring notch 56, pointed teeth 57, disc spring strengthening pad 6, positioning hole 61, positioning protrusion 62, self-sealing air chamber 7, outer seal 8, end face concave 81, inner ring groove 82, extrusion inclined surface 83, extrusion ring 9, extrusion protrusion 91, end face groove 92, lock nut 10, internal thread 101, nut step surface 102, pipeline 11, pipeline through hole 111, annular groove 112, buckle 12, inclined surface 121, radially inward convex 122, buckle positioning seat 13, card slot piece 131, buckle elastic piece 132, lug 133. Detailed implementation mode

[0060] The present invention will be further described in detail below in conjunction with the embodiments in the accompanying drawings.

[0061] As Figures 1 to 14 shown, the first implementation mode of the compression-sealing pipeline quick-connect joint of the present invention is as Figure 1 shown, including a joint body A, the end faces at both ends of the joint body A abut against the end faces of the pipelines 11 on both sides; sealing structures and locking structures for connecting with the pipelines 11 are symmetrically arranged at both ends of the joint body A. The locking structure includes an external thread A1 of the joint and a lock nut 10 that are threadedly connected to each other at both ends of the joint body A. An annular groove A2 that is concave inward from the end face is provided between the inner and outer walls of the interface end of the joint body A. The sealing structure includes an inner seal sleeve 1, a seal and positioning sleeve 4, and an outer seal 8. As Figure 1 shown in / 5 / 7 / 8, the outer cylindrical surface of the inner seal sleeve 1 is provided with a main body O-ring groove 1a and a seal sleeve O-ring groove 1b. One end of the inner seal sleeve 1 extends into the annular groove A2 of the joint body A and is sealed with the inner wall of the annular groove A2 through the main body O-ring 2 arranged in the main body O-ring groove 1a; the other end of the inner seal sleeve 1 is sleeved inside the seal and positioning sleeve 4 and is sealed with the inner wall of the seal and positioning sleeve 4 through the seal sleeve O-ring 3 arranged in the seal sleeve O-ring groove 1b. The other end of the seal and positioning sleeve 4 is sleeved with an outer seal 8 to compress and seal the outer cylindrical surface of the pipeline 11; a nut step surface 102 is provided on the inner side of the lock nut 10 to abut against the outer seal 8. The lock nut 10 is provided with an internal thread 101 that is screwed into the external thread A1 of the joint body A, and the outer seal 8 is radially contracted and pressed tightly on the outer cylinder of the pipeline 11. The internal thread 101 of the lock nut 10 is matched with the external thread A1 on the joint body A, and the thread adopts a US standard serrated thread. The US standard serrated thread has better strength and ensures the reliability of the connection.

[0062] AsFigure 1 As shown in Figure 3 / 9, an extrusion ring 9 is provided between the outer seal 8 and the nut step surface 102 of the lock nut 10. The extrusion ring 9 is provided with an extrusion protrusion 91 and an end face groove 92. The surface where the end face groove 92 is located abuts against the nut step surface 102 of the lock nut 10; one end of the outer seal 8 pressed against the extrusion ring 9 is provided with an extrusion inclined surface 83 adapted to the extrusion protrusion 91. The end face groove 92 of the extrusion ring 9 makes the force applied by the lock nut 10 on the end face of the extrusion ring 9 spread more evenly around, and the end face groove can also reduce the contact area with the nut step surface and reduce the frictional resistance of the nut rotation; the extrusion protrusion 91 of the extrusion ring 9 and the extrusion inclined surface 83 on the outer seal 8 are closely attached to form a wedge-shaped structure. When the lock nut 10 is tightened, the extrusion protrusion 91 extrudes the outer seal 8, forcing the inner ring of the outer seal 8 to radially contract and compress the outer circumference of the pipe.

[0063] As Figure 1 As shown in Figure 3 / 9 / 10, the sealing and positioning sleeve 4 and the pressed end of the outer seal 8 are respectively provided with an end face protrusion 41 and an end face indentation 81. The end face protrusion 41 of the sealing and positioning sleeve 4 and the end face indentation 81 of the outer seal 8 cooperate to form a self-sealing air chamber 7.

[0064] As Figure 9 As shown, an inner ring groove 82 is provided on the inner wall of the outer seal 8.

[0065] As Figure 9 As shown in Figure 10, the outer seal 8 is sleeved in the sealing and positioning sleeve 4, the outer ring is closely attached to the inner wall of the sealing and positioning sleeve 4, and the inner ring is closely attached to the outer circumference of the pipe 11. The sealing and positioning sleeve 4 and the pipe 11 are extrusion-sealed. The extrusion ring 9 is provided with an extrusion protrusion 91 and an end face groove 92. The surface where the end face groove 92 is located abuts against the nut step surface 102 or the locking structure on the lock nut 10. The extrusion protrusion 91 and the extrusion inclined surface 83 on the outer seal 8 are closely attached to form a wedge-shaped structure. When the lock nut 10 is tightened, the extrusion protrusion 91 extrudes the outer seal 8, forcing the inner ring of the outer seal 8 to radially contract and compress the outer circumference of the pipe. The elastic deformation of the inner ring groove 82 can prevent the inner ring from wrinkling during radial contraction and affecting the sealing performance. One end of the sealing and positioning sleeve 4 is provided with an end face protrusion 41, and the upper end face indentation 81 of the outer seal 8 and the protrusion 41 cooperate to form a self-sealing air chamber 7.

[0066] As Figure 1 As shown in Figure 3 / 6 / 7 / 8, a disc spring 5 is provided between the inner seal sleeve 1 and the sealing and positioning sleeve 4. The outer ring of the disc spring 5 is sleeved in the sealing and positioning sleeve 4, and the inner ring of the disc spring 5 is sleeved on the outer surface of the pipe 11 and has pointed teeth 57 biting into the surface of the pipe 11.

[0067] As Figure 8 As shown in Figure 9, the contact end of the inner seal sleeve 1 and the disc spring 5 is provided with a positioning sleeve inclined surface 1c to press the fixed surface of the pointed teeth 57 of the disc spring 5; the contact end of the sealing and positioning sleeve 4 and the disc spring 5 is provided with a disc spring inner ring positioning surface 42 and a disc spring bearing inclined surface 43.

[0068] As Figure 12 shown in FIGS. 13 / 14, the disc spring 5 is provided with a disc spring reinforcing groove 51, an outer ring 52, an outer ring notch 53, an inner ring 54, an inner ring extension section 55 and an inner ring notch 56; the pointed teeth 57 are on the inner ring extension section 55; the included angle between the inner ring extension section 55 and the end face is greater than the included angle between the inner ring 54 and the end face; the outer ring 52 abuts against the inner wall of the disc spring 5, and the inner ring 54 abuts against the disc spring inner ring positioning surface 42; the center of the pointed teeth 57 is on the axis of the pipe 11 and the disc spring 5 does not rotate with the pipe 11.

[0069] As Figure 11 shown, a disc spring axial positioning post 44 is provided at the contact end of the seal positioning sleeve 4 and the disc spring 5. As Figure 3 shown, the disc spring axial positioning post 44 passes through the outer ring notch 53 of the disc spring 5.

[0070] As Figure 1 shown in FIGS. 3 / 7 / 8, a disc spring reinforcing pad 6 is provided between the inner seal sleeve 1 and the disc spring 5. The disc spring reinforcing pad 6 has a positioning hole 61 and a positioning protrusion 62. The disc spring reinforcing pad 6 is installed in the disc spring reinforcing groove 51 of the disc spring 5. The positioning hole 61 is sleeved on the disc spring axial positioning post 44 on the seal positioning sleeve 4, and the positioning protrusion 62 passes through the outer ring notch 53 on the disc spring 5.

[0071] As Figures 7 to 12 shown, the step surface 102 of the lock nut 10 abuts against the surface where the end face groove 92 of the extrusion ring 9 is located. During the process of screwing into the joint body A, the lock nut 10 pushes the extrusion ring 9, the extrusion ring 9 pushes the outer seal 8 and the seal positioning sleeve 4, the seal positioning sleeve 4 pushes the disc spring 5, and the inner ring extension section 55 on the disc spring 5 abuts against the positioning sleeve inclined surface 1c on the inner seal sleeve 1 and radially contracts, and the pointed teeth 57 bite into the pipe 11. As the lock nut 10 is continuously screwed in, the included angle C1 between the inner ring extension section 55 and the end face remains unchanged, the inner ring 54 closely abuts against the disc spring inner ring positioning surface 42 and the height value becomes smaller and smaller, and the pointed teeth 57 bite in deeper until the inner ring extension section 55 completely abuts against the disc spring bearing inclined surface 43. The inner walls of the disc spring bearing inclined surface 43 and the disc spring inner ring positioning surface 42 both abut against the outer circumferential surface of the pipe 11, and the seal positioning sleeve 4 can assist in pressing the toothed disc spring 5 to bear the pulling force generated by the fluid pressure.

[0072] The main principle of the joint seal is as follows: the inner seal sleeve is sealed with the front end of the joint body and the rear end with the seal positioning sleeve, and the other end of the seal positioning sleeve is sealed with the pipeline, ultimately achieving the seal between the pipeline and the joint body. The front end of the inner seal sleeve and the joint body are sealed by a double O-ring static seal, and the other end is sealed by the principle of compression seal generated by a silicone outer seal and self-sealing. There is a wedge-shaped inclined plane at the nut end of the silicone ring, and there is a seal fixing piece between the silicone seal and the seal nut. When the nut is tightened, it pushes the seal fixing piece to move and squeeze the silicone seal. There is a corresponding inclined plane on the seal fixing piece, which forces the silicone seal to shrink inward, squeezing the outer wall of the pipeline to generate a seal. Since the silicone seal is not squeezing the pipeline in the initial state, it is very easy to insert the pipeline, and the pipeline does not need lubrication. Another function of the seal fixing piece is that when the nut rotates, since the plastic used for the silicone seal has a much smaller coefficient of friction than silicone, the silicone seal will not rotate when the nut is rotated, and the tightening force can be greatly reduced. The outer seal and the seal positioning sleeve cooperate to form a self-sealing air chamber. When there is fluid in the pipeline, the fluid will fill the self-sealing air chamber. According to the formula: pressure = pressure * force area (F = PS), the self-sealing air chamber forms a larger area. The greater the fluid pressure, the tighter the silicone seal squeezes the pipeline, and the better the sealing performance.

[0073] The pipeline system is generally installed on the ceiling, and the working pressure of the fluid in the pipe is 16 kg / cm 2 , so safety is the most important. The above locking structure can ensure that the disc spring can penetrate deeper into the pipeline, and the disc spring will not fail during use. The maximum test pressure reaches 30 kg / cm 2 , and after repeated tests, it is safe and reliable.

[0074] The built-in seal structure generates compression seal and self-seal through the silicone outer seal, which can cope with extreme situations such as large pipe diameter errors and non-circularity, has better sealing performance, and can withstand greater pressure.

[0075] The installation and use are more convenient. The pipeline can be easily inserted into the joint nut, and only need to tighten the seal nut and the locking nut two turns to complete the installation.

[0076] The toothed disc spring can still evenly penetrate into the pipe under the condition of large pipe diameter error and non-circular pipe, and at the same time avoid the disc spring from undergoing destructive deformation when the pressure is too large, resulting in unusability. The existing technology has no teeth, which is relatively difficult to penetrate into the pipe, and the force it can withstand is limited. At the same time, in the case of non-circular or large-error pipes, it can only partially penetrate into the pipe, and there will be a situation where the joint flies out during the pressure test. The existing technology disc spring only has a supporting surface and a force-bearing surface, and it is impossible to easily penetrate into the pipe and ensure the penetration depth when tightening the nut.

[0077] The silicone outer seal generates compression sealing and self-sealing, with more reliable sealing performance. It can be used in cases where there are large errors or the pipe is not round due to cutting. With self-sealing, it can ensure that the pipeline system does not leak even under high pressure. Since the sealant only shrinks and squeezes the aluminum pipe after the nut is fully tightened, and the sealant no longer squeezes the aluminum pipe when the nut is loosened, the aluminum pipe is easier to insert and pull out during installation and disassembly. In the prior art, the initial sealant squeezes the pipe, and during installation, lubricating oil must be applied to the aluminum pipe, otherwise it will be very difficult to insert it into the joint. And when the outer diameter error of the pipe is large or it is not round, there is a possibility of leakage, the sealing is not reliable, and the leakage phenomenon is more obvious under higher pressure.

[0078] Tightening the sealing nut is more labor-saving. Since the nut does not participate in direct sealing and the silicone outer seal is squeezed by the sealing push member, there is no friction between the nut and the silicone during the rotation of the nut. In the prior art, the sealant is directly installed on the nut. When tightening the nut, the silicone rotates together, and the friction between the silicone and the pipe, or the friction between the nut and the silicone, will increase the resistance to tightening the sealing nut.

[0079] As Figures 15 to 19 shown, in the second embodiment of the compression-sealing pipe quick-connect fitting of the present invention, the difference between the second embodiment and the first embodiment is that there is a combined structure with two symmetrically arranged snap fasteners 12 elastically installed on the outer cylindrical surface of the snap fastener positioning seat 13 between the inner seal sleeve 1 and the seal positioning sleeve 4, and this combined structure replaces the disc spring 5. There are symmetrically arranged pipe through holes 111 on the outer cylindrical surface of the end of the pipe 11; the outer ring of the above combined structure is sleeved and positioned on the inner wall of the seal positioning sleeve 4; the inner ring of the above combined structure is sleeved on the outer surface of the pipe 11, and the snap fastener 12 passes through the snap fastener positioning seat 13 and is buckled into the pipe through hole 111.

[0080] As Figure 17 shown, the cylindrical surface of the snap fastener positioning seat 13 is provided with a long hole surrounding the outer cylindrical surface, snap fastener elastic pieces 132 are provided on both sides of the long hole, a groove piece 131 is provided axially, and a lug 133 is provided on one end face; one end of the snap fastener 12 is pressed on the lug 133; an inclined surface 121 and a radially inner convex 122 are provided on the side of the snap fastener 12; the radially inner convex 122 on the snap fastener 12 passes through the long hole on the cylindrical surface of the snap fastener positioning seat 13, and the inner wall abuts against the snap fastener elastic piece 132.

[0081] As Figure 17 / 18 shown, the inner wall of the seal positioning sleeve 4 is provided with snap fastener positioning protrusions 45 and bayonet grooves 46; the lug 133 of the snap fastener positioning seat 13 is between the two snap fastener positioning protrusions 45, and the axially arranged groove piece 131 is stuck in the bayonet groove 46; a positioning sleeve inclined surface 1c is provided at the contact end of the inner seal sleeve 1 and the snap fastener 12 to press the inclined surface 121 of the snap fastener 12.

[0082] AsFigure 15 As shown in Figure 16 / 19, tighten the locking nut 10 to push the extrusion ring 9. The extrusion ring 9 pushes the outer seal 8 and the seal positioning sleeve 4. The seal positioning sleeve 4 pushes the buckle 12 and the buckle positioning seat 13. The inclined surface 121 on the buckle 12 is in close contact with the positioning sleeve inclined surface 1c on the inner seal sleeve 1. The radially inner protrusion 122 on the buckle 12 starts to enter the through hole 111 until the inclined surface 121 and the positioning sleeve inclined surface 1c are completely aligned, and the radially inner protrusion 122 completely enters the through hole 111, indicating that the joint installation is completed. When disassembling, loosen the locking nut 10, the inclined surface 121 and the positioning sleeve inclined surface 1c are disengaged, the buckle elastic piece 132 on the buckle positioning seat 13 radially pushes the buckle 12 outwards, and the radially inner protrusion 122 pops out of the through hole 111, and then the pipe 11 can be pulled out from the joint.

[0083] In summary, as described in the specification and illustrations of the present invention, the actual sample is made and tested through multiple uses. From the test results, it is proved that the invention can achieve the expected purpose, and its practicability is beyond doubt. The above-mentioned embodiments are only used to conveniently illustrate the content of the invention and are not intended to limit it formally; any person with common general knowledge in the technical field can, without departing from the technical features and similar features of the present invention, make local changes or modified equivalent embodiments by using the technical content disclosed in the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A quick-connect fitting for a compression-sealed pipeline, comprising a fitting body (A), characterized in that: The outer wall of the interface end of the joint body (A) is provided with an external thread of the joint (A1), and an annular groove (A2) concave inward from the end face is provided between the inner and outer walls, and a lock nut (10) threadedly connected to the external thread of the joint (A1); An inner seal sleeve (1), a seal positioning sleeve (4) and an outer seal (8) are provided between the annular groove (A2) and the lock nut (10); The inner end of the seal positioning sleeve (4) sleeved on the outer end of the inner seal sleeve (1), and the outer end sleeved with the outer seal (8) therein; The inner end of the inner seal sleeve (1) is positioned in the annular groove (A2); A disc spring (5) is provided between the outer end of the inner seal sleeve (1) and the seal positioning sleeve (4); The pressing ends of the seal positioning sleeve (4) and the outer seal (8) are respectively provided with a mating end face projection (41) and an end face recess (81); A main body O-ring (2) is provided for sealing between one end of the outer wall of the inner seal sleeve (1) and the inner wall of the annular groove (A2), and a seal sleeve O-ring (3) is provided for sealing between the other end of the outer wall of the inner seal sleeve (1) and the inner wall of the seal positioning sleeve (4); When the lock nut (10) is tightened, it squeezes the inner seal sleeve (1), the seal positioning sleeve (4), and the outer seal (8) to move axially, causing the inner seal sleeve (1), the disc spring (5), and the outer seal (8) to undergo a diameter reduction deformation, and the disc spring (5) radially contracts to form a pressure self-enhanced seal; The end face projection (41) of the seal positioning sleeve (4) and the end face recess (81) of the outer seal (8) cooperate to form a self-sealing air chamber (7).

2. The quick-connect fitting for a compression-sealed pipeline according to claim 1, wherein An extrusion ring (9) is provided between the outer seal (8) and the nut step surface (102) of the lock nut (10). The extrusion ring (9) is provided with an extrusion projection (91) and an end face groove (92), and the surface where the end face groove (92) is located abuts against the nut step surface (102) of the lock nut (10); One end of the outer seal (8) pressed against the extrusion ring (9) is provided with an extrusion inclined surface (83) adapted to the extrusion projection (91).

3. The quick-connect fitting for compression-sealed pipelines according to claim 1, characterized in that The contact end of the inner seal sleeve (1) and the disc spring (5) is provided with a positioning sleeve inclined surface (1c) to position the disc spring (5); The disc spring (5) is sleeved between the inner and outer walls of the seal positioning sleeve (4); The disc spring (5) has pointed teeth (57), and the pointed teeth (57) bite into the surface of the pipeline (11).

4. The quick-connect fitting for a compression-sealed pipeline according to claim 3, characterized in that The disc spring (5) is provided with a disc spring strengthening groove (51), an outer ring (52), an outer ring notch (53), an inner ring (54), an inner ring extension section (55) and an inner ring notch (56); The pointed teeth (57) are on the inner ring extension section (55); The included angle between the inner ring extension section (55) and the end face is greater than the included angle between the inner ring (54) and the end face.

5. The quick-connect fitting for a compression-sealed pipe according to claim 4, characterized in that The contact end of the seal positioning sleeve (4) and the disc spring (5) is provided with a disc spring inner ring positioning surface (42) and a disc spring bearing inclined surface (43); The outer ring (52) abuts against the inner wall of the seal positioning sleeve (4), and the inner ring (54) abuts against the disc spring inner ring positioning surface (42); The inner ring extension section (55) is pressed on the disc spring bearing inclined surface (43).

6. The quick-connect fitting for a compression-sealed pipeline according to claim 5, wherein The contact end of the seal positioning sleeve (4) and the disc spring (5) is provided with a disc spring axial positioning column (44), and the disc spring axial positioning column (44) passes through the outer ring notch (53) of the disc spring (5).

7. The quick-connect fitting for a compression-sealed pipeline according to claim 6, characterized in that A disc spring reinforcing groove (51) is internally provided with a disc spring reinforcing pad (6). The disc spring reinforcing pad (6) has a positioning hole (61) and a positioning protrusion (62). The positioning hole (61) is sleeved in a disc spring axial positioning column (44) on a sealing positioning sleeve (4), and the positioning protrusion (62) is located in an outer ring notch (53) on the disc spring (5).

8. The quick-connect fitting for compression-sealed pipelines according to claim 1, characterized in that The disc spring (5) is replaced by a buckle (12) and a buckle positioning seat (13). There are two symmetrical buckles (12), which are elastically installed on the outer cylindrical surface of the buckle positioning seat (13); two symmetrical pipeline through holes (111) are provided on the outer cylindrical surface of the end of the pipeline (11); the outer ring of the buckle positioning seat (13) is sleeved and positioned on the inner wall of the sealing positioning sleeve (4); when the locking nut (10) is tightened, the buckle (12) radially contracts and is buckled into the pipeline through hole (111).

9. The quick-connect fitting for a compression-sealed pipeline according to claim 8, characterized in that The cylindrical surface of the buckle positioning seat (13) is provided with a long hole surrounding the outer cylindrical surface. Buckle elastic pieces (132) are provided on both sides of the long hole, and a lug (133) is provided on one end face; one end of the buckle (12) is pressed on the lug (133); the buckle (12) is provided with a radially inward protrusion (122), and the radially inward protrusion (122) passes through the long hole on the cylindrical surface of the buckle positioning seat (13), and the inner wall abuts against the buckle elastic piece (132).

10. The quick-connect fitting for a compression-sealed pipeline according to claim 9, characterized in that The inner wall of the sealing positioning sleeve (4) is provided with a buckle positioning protrusion (45) and a bayonet groove (46); the buckle positioning seat (13) is axially provided with a clamping groove piece (131), and the lug (133) of the buckle positioning seat (13) is between two buckle positioning protrusions (45), and the axially arranged clamping groove piece (131) is clamped in the bayonet groove (46); The buckle (12) is provided with an inclined surface (121), and the contact end of the inner sealing sleeve (1) and the buckle (12) is provided with a positioning sleeve inclined surface (1c) to press the inclined surface (121) of the buckle (12).

11. The quick-connect fitting for a compression-sealed pipeline according to claim 1, characterized in that The end face of the interface end of the joint body (A) abuts against the end face of the pipeline (11).

12. The quick-connect fitting for a compression-sealed pipeline according to claim 1, characterized in that The inner wall of the outer seal (8) is provided with an inner ring groove (82).

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