Self-sealing threaded pipe quick coupling

Abstract

The utility model belongs to pipe connection technical field discloses a kind of self-sealing threaded pipe quick couplings, the quick couplings include joint body and tooth ring nut, the both ends of the joint body are processed and set with external thread, the tooth ring nut is internally provided with stepped conical cavity, the stepped conical cavity of the tooth ring nut is formed by the taper section and cylindrical section of coaxial link, the quick couplings further include taper sealing ring and split washer;The taper sealing ring is nested in the taper section of the stepped conical cavity, the outer wall of the taper sealing ring is matched with the gradient of the taper section of the stepped conical cavity, the inner wall of the taper sealing ring is attached to the pipe outer wall;The utility model is magnetically attracted by split washer self-calibration, the double sealing of taper sealing ring and wear-resistant lubricating layer, realize quick installation calibration-free, high-pressure sealing reliable and long life, suitable for narrow space operation.

Description

Technical Field

[0001] This utility model belongs to the field of pipe connection technology, and more specifically, it relates to a self-sealing threaded pipe quick-connect fitting. Background Technology

[0002] In the field of pipeline connection technology, threaded quick-connect couplings are widely used in petrochemical, marine, and hydraulic systems due to their simple structure and convenient assembly / disassembly. However, existing technologies have the following core drawbacks:

[0003] 1. Low installation efficiency: Traditional joints rely on manual calibration of pipe concentricity, which is time-consuming, especially when working in confined spaces. On average, pipe installation takes more than 30 minutes. In addition, integral gaskets require high precision in the machining of pipe end faces, otherwise, it is easy to cause sealing failure.

[0004] 2. Insufficient reliability of high-pressure seals: O-ring seals have insufficient deformation under pressures greater than 15MPa, resulting in a high leakage rate; while the traditional conical seal structure design has insufficient radial extrusion force, making it easy for high-pressure fluids to erode the sealing surface.

[0005] 3. Poor vibration resistance and maintainability: Under vibration conditions, the snap ring locking structure is prone to loosening, the tensile strength is insufficient, and the integral sealing ring needs to be replaced as a whole after wear, resulting in high maintenance costs.

[0006] Therefore, this utility model provides a self-sealing threaded pipe quick-connect fitting. Utility Model Content

[0007] In view of the above-mentioned problems of the existing technology, the purpose of this utility model is to provide a self-sealing threaded pipe quick-connect fitting. This quick-connect fitting achieves quick installation without calibration, reliable high-pressure sealing and long service life through the magnetic self-calibration of the split gasket, the double sealing of the conical sealing ring and the wear-resistant lubrication layer, and is suitable for operation in confined spaces.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] A self-sealing threaded pipe quick-connect fitting includes a fitting body and a toothed ring nut. External threads are machined on both ends of the fitting body. The toothed ring nut has a stepped conical cavity inside. The stepped conical cavity of the toothed ring nut is composed of a conical section and a cylindrical section connected coaxially. The quick-connect fitting also includes a conical sealing ring and a split washer.

[0010] The conical sealing ring is nested within the conical section of the stepped conical cavity, the outer wall of the conical sealing ring matches the slope of the conical section of the stepped conical cavity, and the inner wall of the conical sealing ring fits against the outer wall of the pipe.

[0011] The split gasket is composed of at least two arc-shaped flaps joined together, and the split gasket is disposed within the cylindrical section of the stepped conical cavity;

[0012] The quick-connect coupling is tightened onto the coupling body by the toothed ring nut. The stepped conical cavity of the toothed ring nut pushes the split washer inside to move axially. The split washer squeezes the conical sealing ring to produce radial deformation, thereby achieving self-sealing of the pipeline.

[0013] As a further preferred technical solution of this utility model, the cone angle of the conical sealing ring is 8°-12°, the inner wall of the conical sealing ring is provided with an annular corrugated groove, and the outer wall of the conical sealing ring is embedded with a wear-resistant layer, which is made of carbonitriding steel.

[0014] As a further preferred technical solution of this utility model, the inner wall of the arc-shaped retaining flap of the split washer is provided with anti-slip teeth, and the outer wall of the arc-shaped retaining flap is provided with a guide slope, and the guide slope is in clearance fit with the inner wall of the cylindrical section of the stepped conical cavity.

[0015] As a further preferred technical solution of this utility model, magnetic blocks are embedded on the splicing end faces between the arc-shaped card flaps, and adjacent magnetic blocks have opposite polarities.

[0016] The axial thickness of the split gasket is 1.2 to 1.5 times that of the conical sealing ring.

[0017] As a further preferred technical solution of this utility model, a compression spring is provided between the stepped conical cavity of the toothed ring nut and the split washer. One end of the compression spring abuts against the split washer, and the other end of the compression spring is fixed to the stepped surface of the conical cavity.

[0018] As a further preferred technical solution of this utility model, the external thread of the connector body is a trapezoidal thread, the tooth angle of the trapezoidal thread is 30°, and the pitch of the trapezoidal thread is 2-3mm.

[0019] The inner wall of the toothed ring nut is provided with an internal thread groove that matches the trapezoidal thread of the connector body.

[0020] As a further preferred technical solution of this utility model, an annular groove is provided on the outer wall of the arc-shaped retaining flap of the split washer, and an anti-detachment ring is sleeved on the outer side of the arc-shaped retaining flap of the split washer. The anti-detachment ring is made of elastic material, and the cross-section of the anti-detachment ring is C-shaped. The anti-detachment ring is inserted into the annular groove on the outer wall of the arc-shaped retaining flap.

[0021] As a further preferred technical solution of this utility model, the contact surfaces of the conical sealing ring and the split gasket are coated with a solid lubricating layer, wherein the solid lubricating layer is a molybdenum disulfide or graphene composite material.

[0022] As described above, the self-sealing threaded pipe quick-connect coupling provided by this utility model has the following beneficial effects:

[0023] This utility model utilizes the aforementioned self-sealing threaded pipe quick-connect coupling. Compared with existing technologies, due to its structure, the arc-shaped retaining flap of the split gasket and the magnetic attraction design of opposite poles eliminate the need for manual calibration during pipe installation, shortening operation time. Furthermore, the clearance fit between the guide bevel and the conical cavity ensures smooth axial movement of the split gasket, requiring only ordinary pipe wrenches to tighten the toothed ring nut to complete the seal, making it suitable for operations in confined spaces. In addition, the 8°–12° cone angle of the conical sealing ring and the annular corrugated groove form a double adaptive seal, which increases the radial deformation compared to traditional O-rings, resulting in a closer seal surface under high pressure. The wear-resistant layer of the conical sealing ring resists fluid erosion, extending its service life, and the solid lubrication layer reduces frictional wear between the sealing ring and the gasket, preventing high-temperature seizing failure and expanding the applicable temperature range.

[0024] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural schematic diagram of a self-sealing threaded pipe quick-connect fitting according to this utility model application;

[0027] Figure 2 This is a cross-sectional view of a self-sealing threaded pipe quick-connect fitting according to this utility model application;

[0028] Figure 3 for Figure 2 Enlarged schematic diagram of point I in the middle;

[0029] Figure 4 This is a schematic diagram of the toothed ring nut of a self-sealing threaded pipe quick-connect fitting according to this utility model application;

[0030] Figure 5This is a schematic diagram of the conical sealing ring of a self-sealing threaded pipe quick-connect fitting according to this utility model application;

[0031] Figure 6 This is a schematic diagram of the structure of a split gasket for a self-sealing threaded pipe quick-connect fitting according to this utility model application;

[0032] Figure 7 This is a cross-sectional view of a split gasket for a self-sealing threaded pipe quick-connect fitting, as per this utility model application.

[0033] Summary of figure labels and their descriptions:

[0034] 100. Connector body; 110. External thread; 200. Toothed ring nut; 210. Stepped conical cavity; 211. Conical section; 212. Cylindrical section; 220. Internal thread groove; 300. Conical sealing ring; 310. Annular corrugated groove; 320. Wear-resistant layer; 400. Split washer; 410. Arc-shaped retaining flap; 411. Anti-slip teeth; 412. Guide slope; 413. Magnetic block; 414. Ring groove; 500. Compression spring; 600. Anti-detachment ring; 700. Pipe. Detailed Implementation

[0035] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0036] It should be noted that the structures, proportions, and sizes depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention. Specific structures can be described with reference to the accompanying drawings of the patent application.

[0037] This utility model provides a self-sealing threaded pipe quick-connect coupling. Please refer to [link / reference]. Figures 1 to 7As shown, the quick-connect coupling includes a coupling body 100 and a toothed ring nut 200. External threads 110 are machined on both ends of the coupling body 100. The toothed ring nut 200 has a stepped conical cavity 210 inside. The stepped conical cavity 210 of the toothed ring nut 200 is composed of a conical section 211 and a cylindrical section 212 connected coaxially. The quick-connect coupling also includes a conical sealing ring 300 and a split washer 400.

[0038] The conical sealing ring 300 is nested within the conical section 211 of the stepped conical cavity 210. The outer wall of the conical sealing ring 300 matches the slope of the conical section 211 of the stepped conical cavity 210. The inner wall of the conical sealing ring 300 is in contact with the outer wall of the pipe 700.

[0039] The split washer 400 is composed of at least two arc-shaped flaps 410. In this embodiment, the split washer 400 is composed of two arc-shaped flaps 410 and is disposed in the cylindrical section 212 of the stepped conical cavity 210.

[0040] The quick-connect coupling is tightened to the coupling body 100 by the toothed ring nut 200. The stepped conical cavity 210 of the toothed ring nut 200 pushes the split washer 400 inside to move axially. The split washer 400 compresses the conical sealing ring 300 to produce radial deformation, thereby achieving self-sealing of the pipeline 700.

[0041] It should be noted that the stepped conical cavity 210 (conical section 211 + cylindrical section 212) of the toothed ring nut 200 integrates the conical sealing ring 300 and the split washer 400. When the toothed ring nut 200 is tightened, it simultaneously drives the sealing and locking, eliminating the need for manual calibration and improving the installation speed. Furthermore, the split washer 400 axially compresses the conical sealing ring 300, generating a dual sealing force of radial deformation and axial pre-tightening, thereby improving the sealing performance.

[0042] The cone angle of the conical sealing ring 300 is 8°-12°. The 8°–12° cone angle increases the radial deformation of the sealing ring when it is compressed. The inner wall of the conical sealing ring 300 is provided with an annular corrugated groove 310. The annular corrugated groove 310 enhances the deformation adaptability of the conical sealing ring 300. The outer wall of the conical sealing ring 300 is embedded with a wear-resistant layer 320. The wear-resistant layer 320 is made of carbonitriding steel and has a surface hardness greater than or equal to HRC60, which enhances the ability of the conical sealing ring 300 to resist fluid erosion and extends its service life.

[0043] The inner wall of the arc-shaped retaining flap 410 of the split gasket 400 is provided with anti-slip teeth 411, and the outer wall of the arc-shaped retaining flap 410 is provided with a guide slope 412. The guide slope 412 is in clearance fit with the inner wall of the cylindrical section 212 of the stepped conical cavity 210, with a clearance tolerance of 0.1–0.3 mm. The clearance fit between the guide slope 412 and the cavity ensures that the split gasket moves axially without jamming, while the anti-slip teeth 411 on the inner wall increase the friction coefficient of the pipeline and improve its tensile strength under vibration conditions.

[0044] Magnetic blocks 413 are embedded on the splicing end faces between the arc-shaped card petals 410. Adjacent magnetic blocks 413 have opposite polarities. The opposite polarity magnetic blocks 413 automatically attract and position themselves, shortening the splicing time of the split washers.

[0045] The axial thickness of the split gasket 400 is 1.2 to 1.5 times that of the conical sealing ring 300.

[0046] A compression spring 500 is provided between the stepped conical cavity 210 of the toothed ring nut 200 and the split washer 400. One end of the compression spring 500 abuts against the split washer 400, and the other end of the compression spring 500 is fixed to the stepped surface of the conical cavity.

[0047] The external thread 110 of the connector body 100 is a trapezoidal thread, the tooth angle of the trapezoidal thread is 30°, and the pitch of the trapezoidal thread is 2-3mm.

[0048] The inner wall of the toothed ring nut 200 is provided with an internal thread groove 220 that matches the trapezoidal thread of the connector body 100.

[0049] It should be noted that the trapezoidal thread with a 30° tooth angle and a pitch of 2–3 mm requires a tightening torque of only 15 N·m (compared to 25 N·m for ordinary triangular threads), making operation convenient and labor-saving. Furthermore, the use of low-friction threads reduces the runout of the toothed nut 200 and improves the deformation uniformity of the conical sealing ring 300.

[0050] The split gasket 400 has an annular groove 414 on the outer wall of the arc-shaped retaining flap 410. An anti-detachment ring 600 is fitted on the outer side of the arc-shaped retaining flap 410. The anti-detachment ring 600 is made of elastic material and has a C-shaped cross-section. The anti-detachment ring 600 is inserted into the annular groove 414 on the outer wall of the arc-shaped retaining flap 410. This reduces the risk of disassembly of the split gasket 400 during disassembly and assembly, improves maintenance efficiency, and the anti-detachment ring 600 is made of elastic material (such as 60Si2Mn) with a deformation of ≤0.2mm under pipeline impact load, protecting the integrity of the split gasket structure.

[0051] The contact surfaces of the conical sealing ring 300 and the split gasket 400 are coated with a solid lubricating layer. The solid lubricating layer is a molybdenum disulfide or graphene composite material. The molybdenum disulfide / graphene solid lubricating layer reduces the coefficient of friction and extends the service life of the conical sealing ring 300.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A self-sealing threaded pipe quick-connect fitting, the quick-connect fitting comprising a fitting body and a toothed ring nut, wherein external threads are machined on both ends of the fitting body, characterized in that, The toothed ring nut has a stepped conical cavity inside, which is composed of a conical section and a cylindrical section connected coaxially. The quick-connect coupling also includes a conical sealing ring and a split washer. The conical sealing ring is nested within the conical section of the stepped conical cavity, the outer wall of the conical sealing ring matches the slope of the conical section of the stepped conical cavity, and the inner wall of the conical sealing ring fits against the outer wall of the pipe. The split gasket is composed of at least two arc-shaped flaps joined together, and the split gasket is disposed within the cylindrical section of the stepped conical cavity; The quick-connect coupling is tightened onto the coupling body by the toothed ring nut. The stepped conical cavity of the toothed ring nut pushes the split washer inside to move axially. The split washer squeezes the conical sealing ring to produce radial deformation, thereby achieving self-sealing of the pipeline.

2. The self-sealing threaded pipe quick-connect coupling according to claim 1, characterized in that, The cone angle of the conical sealing ring is 8°-12°. The inner wall of the conical sealing ring is provided with an annular corrugated groove. The outer wall of the conical sealing ring is embedded with a wear-resistant layer, which is made of carbonitriding steel.

3. The self-sealing threaded pipe quick-connect fitting according to claim 1, characterized in that, The inner wall of the arc-shaped retaining flap of the split washer is provided with anti-slip teeth, and the outer wall of the arc-shaped retaining flap is provided with a guide slope. The guide slope is in clearance fit with the inner wall of the cylindrical section of the stepped conical cavity.

4. The self-sealing threaded pipe quick-connect coupling according to claim 1, characterized in that, Magnetic blocks are embedded on the splicing end faces between the arc-shaped card segments, and adjacent magnetic blocks have opposite polarities; The axial thickness of the split gasket is 1.2 to 1.5 times that of the conical sealing ring.

5. A self-sealing threaded pipe quick-connect fitting according to claim 1, characterized in that, A compression spring is provided between the stepped conical cavity of the toothed ring nut and the split washer. One end of the compression spring abuts against the split washer, and the other end of the compression spring is fixed to the stepped surface of the conical cavity.

6. A self-sealing threaded pipe quick-connect fitting according to claim 1, characterized in that, The external thread of the connector body is a trapezoidal thread, the tooth angle of the trapezoidal thread is 30°, and the pitch of the trapezoidal thread is 2-3mm; The inner wall of the toothed ring nut is provided with an internal thread groove that matches the trapezoidal thread of the connector body.

7. A self-sealing threaded pipe quick-connect fitting according to claim 1, characterized in that, The outer wall of the arc-shaped retaining flap of the split washer is provided with an annular groove, and an anti-detachment ring is fitted on the outer side of the arc-shaped retaining flap of the split washer. The anti-detachment ring is made of elastic material and has a C-shaped cross-section. The anti-detachment ring is inserted into the annular groove on the outer wall of the arc-shaped retaining flap.

8. A self-sealing threaded pipe quick-connect fitting according to any one of claims 1-7, characterized in that, The contact surfaces of the conical sealing ring and the split gasket are coated with a solid lubricating layer, which is a molybdenum disulfide or graphene composite material.

Images