Quick-connect pipe fitting and insert assembly thereof

Abstract

Disclosed are a quick-connect pipe fitting and an insert assembly thereof. The insert assembly comprises a pipe removal bushing (1), an outer clamp sleeve (2), an inner clamp sleeve (6), a circular retaining ring (3), and a washer (4), wherein a pipe removal bushing limiting step and a circular retaining ring limiting step are provided on the inner side of the outer clamp sleeve; an anti-pullout boss (f) is further provided on the outer side of the outer clamp sleeve; a small annular limiting protrusion (i) protruding inwards is provided on the inner side of the inner clamp sleeve, a mounting spigot (j) protruding outwards is formed on the outer side of the inner clamp sleeve, and a docking part extending into a third hole part (d) of the outer clamp sleeve to be docked with the outer clamp sleeve is provided on the side of the mounting spigot away from the small annular limiting protrusion; the washer and the retaining ring are provided between the docking part and the circular retaining ring limiting step. The pipe fitting can be used for mounting of a plastic pipe by direct insertion, can be applied to the fields of domestic water supply conveying, agricultural irrigation and special fluids, and has the advantages of being environmentally-friendly, durable, reliable in connection, wide in application range and the like.

Description

Pipe quick-connect fittings and their insert assemblies

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202321914375X, filed with the China Patent Office on July 19, 2023, entitled “Pipe Quick Connector and Insert Assembly Thereof,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of pipeline connection, and in particular to a pipeline quick-connect joint and an insert assembly thereof. Background Art

[0004] Currently, when laying plastic pipes in the building materials industry both domestically and internationally, flange connections, fusion welding, compression joints, and chemical solvent bonding are commonly used. Flange connections, fusion welding, and compression joints often require auxiliary tools and special installation or heating tools, which are labor-intensive and time-consuming. Chemical solvent bonding often uses pungent solvents, which corrode the contact surfaces of pipes and fittings, causing some pollution to the conveying medium and the external environment. Therefore, a quick-connect fitting or method for plastic pipes that requires no installation tools, is environmentally friendly, and saves time and labor is particularly needed.

[0005] In view of this, this application is hereby filed.

[0006] Summary of the Invention

[0007] The purpose of the present disclosure is to provide a pipe quick-connect joint and an insert assembly thereof, which can overcome the problem that common pipe and pipe fitting connections require the use of "third-party" tools such as heating tools, installation tools and chemical additives, and cannot be used directly for pipe connection with bare hands.

[0008] The embodiments of the present disclosure are implemented as follows:

[0009] In a first aspect, the present disclosure provides an insert assembly for a pipe quick-connect joint, comprising a pipe removal bushing, an outer ferrule, an inner ferrule, an annular retaining ring and a washer, wherein:

[0010] The inner side of the outer ferrule is provided with a first hole portion, a second hole portion and a third hole portion in sequence along the axial direction, the diameters of the first hole portion, the second hole portion and the third hole portion gradually increase, a pipe removal bushing limiting step is formed at the connection between the first hole portion and the second hole portion, and an annular retaining spring limiting step is formed at the connection between the second hole portion and the third hole portion; an anti-pull-off boss is also provided on the outer side of the outer ferrule;

[0011] The inner side of the inner ferrule is provided with an inwardly convex small circular limiting protrusion, the outer side of the inner ferrule is provided with an outwardly protruding mounting stop, and the mounting stop is provided with a docking portion extending into the third hole portion to dock with the outer ferrule on the side away from the small circular limiting protrusion;

[0012] The washer is arranged between the docking portion and the annular retaining spring limiting step, the maximum outer edge of the annular retaining spring is pressed between the washer and the annular retaining spring limiting step, the inner diameter of the annular retaining spring near the minimum inner edge is smaller than the inner diameter of the tube removal bushing, and the annular retaining spring is inclined toward the direction close to the inner retaining sleeve near the minimum inner edge, the tube removal bushing is arranged on the side of the annular retaining spring away from the inner retaining sleeve, the tube removal bushing is provided with a limiting portion adapted to the tube removal bushing limiting step, and the side of the limiting portion close to the annular retaining spring is provided with a pressing portion pressed against the annular retaining spring near the minimum inner edge.

[0013] In an optional embodiment, a positioning boss is provided on the end surface of the outer ferrule close to the first hole portion.

[0014] In an optional embodiment, the outer diameter of the positioning boss is smaller than the outer diameter of the outer ferrule where the positioning boss is located.

[0015] In an optional embodiment, a large concave annular step is provided on the inner side of the docking portion, and the large annular step and the gasket form an annular groove for accommodating a sealing ring.

[0016] In an optional embodiment, an annular groove is provided on the outer side of the inner ferrule.

[0017] In an optional embodiment, an insert sealing ring is provided in the annular groove.

[0018] In an optional embodiment, a support structure is provided on the inner side of the inner ferrule, and the support structure is provided at an end of the inner ferrule away from the outer ferrule.

[0019] In an optional embodiment, the outer diameter of the pressing portion gradually decreases in a direction approaching the annular retaining spring.

[0020] In an optional embodiment, the angle between the outer surface of the pressing portion and the axis is smaller than the angle between the minimum inner edge of the annular retaining spring and the axis.

[0021] In an optional embodiment, the annular retaining spring is a claw-type hard metal retaining spring.

[0022] In a second aspect, the present disclosure provides a pipe quick-connect joint, comprising a pipe body, wherein the pipe body is provided with an insert assembly for a pipe quick-connect joint according to any one of the aforementioned embodiments.

[0023] In an optional embodiment, each of the pipe fitting bodies includes two or more insert assemblies for pipe quick-connect joints.

[0024] In an optional embodiment, the main body of the pipe is made of at least one of PE, PP-R, PVC, ABS, PB, POM and PA.

[0025] In an optional embodiment, an inner sleeve is further included, wherein the inner sleeve includes an inserting portion for inserting into the pipe to be connected, and the inserting portion extends to the inner side of the annular retaining ring.

[0026] In an optional embodiment, one end of the extending portion is provided with an outward convex limiting platform capable of cooperating with the small circular ring limiting protrusion.

[0027] In an optional embodiment, the outer convex limiting platform is located on a side of the small circular limiting protrusion close to the pipe removal bushing, and an accommodating cavity for inserting the pipe to be connected is provided between the inner bushing and the pipe removal bushing.

[0028] The beneficial effects of the embodiments of the present disclosure are:

[0029] The present disclosure can be used to install plastic pipes in a direct insertion manner, and can be applied in the fields of transporting civil water supply, agricultural irrigation and special fluids. It has the advantages of being environmentally friendly and durable, having reliable connections and a wide range of uses. Secondly, the present disclosure can be used to connect plastic pipes of different materials, which is practical, fast, convenient and reliable. The pipe joints and the insert components used in the present disclosure can both be injection molded, and the product wall thickness is uniform and single, and the overall structure is firm.

[0030] Compared with traditional nut-type quick-connect pipe fittings, the present invention eliminates the production processes such as thread assembly, shortens the production cycle, reduces material and production costs, and eliminates the risk of nuts loosening and falling out. It has obvious product advantages and is more conducive to promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0032] FIG1 is a schematic structural diagram of an insert assembly for a pipe quick-connect joint according to an embodiment of the present disclosure;

[0033] FIG2 is a schematic structural diagram of an outer ferrule in an embodiment of the present disclosure;

[0034] FIG3 is a schematic structural diagram of an inner ferrule in an embodiment of the present disclosure;

[0035] FIG4 is a schematic structural diagram of a pipe removal bushing in an embodiment of the present disclosure;

[0036] FIG5 is a schematic structural diagram of a pipe quick-connect joint according to an embodiment of the present disclosure.

[0037] Icons: 1-pipe removal bushing; 2-external ferrule; 3-circlip; 4-washer; 5-sealing ring; 6-internal ferrule; 7-insert sealing ring; 8-pipe fitting body; 9-inner bushing;

[0038] a-positioning boss; b-first hole portion; c-second hole portion; d-third hole portion; e-sealing plane; f-anti-pull-off boss; h-large circular step; i-small circular limiting protrusion; j-installation stop; k-support structure; l-annular groove; m-limiting portion; n-pressing portion. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, but not all of them. Generally, the components of the embodiments of the present disclosure described and shown in the drawings herein can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the present disclosure as claimed, but merely represents selected embodiments of the present disclosure. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative effort shall fall within the scope of protection of the present disclosure.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] In the description of the present disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the disclosed product is typically placed when in use. These terms are intended solely to facilitate the description of the present disclosure and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present disclosure. Furthermore, the terms "first," "second," "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0044] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0045] 1 to 4 , an embodiment of the present application provides an insert assembly for a pipe quick-connect joint, comprising a pipe bushing 1, an outer ferrule 2, an inner ferrule 6, an annular retaining ring 3 and a washer 4, wherein:

[0046] The inner side of the outer ferrule 2 is provided with a first hole portion b, a second hole portion c and a third hole portion d in sequence along the axial direction. The diameters of the first hole portion b, the second hole portion c and the third hole portion d gradually increase. A limiting step for the pipe removal bushing 1 is formed at the connection between the first hole portion b and the second hole portion c, and a limiting step for the annular retaining ring 3 is formed at the connection between the second hole portion c and the third hole portion d. An anti-pull-off boss f is also provided on the outer side of the outer ferrule 2.

[0047] The inner side of the inner ferrule 6 is provided with an inwardly convex small circular limiting protrusion i, and the outer side of the inner ferrule 6 is provided with an outwardly protruding mounting stop j, and the mounting stop j is provided with a docking portion extending into the third hole portion d to dock with the outer ferrule 2 on the side away from the small circular limiting protrusion i;

[0048] The washer 4 is arranged between the docking portion and the limiting step of the annular retaining spring 3, and the maximum outer edge of the annular retaining spring 3 is against the limiting step of the washer 4 and the annular retaining spring 3. The inner diameter of the annular retaining spring 3 near the minimum inner edge is smaller than the inner diameter of the pipe removal bushing 1, and the annular retaining spring 3 is inclined toward the direction close to the inner retaining sleeve 6 near the minimum inner edge. The pipe removal bushing 1 is arranged on the side of the annular retaining spring 3 away from the inner retaining sleeve 6. The pipe removal bushing 1 is provided with a limiting portion m adapted to the limiting step of the pipe removal bushing 1, and the side of the limiting portion m close to the annular retaining spring 3 is provided with a pressing portion n against the annular retaining spring 3 near the minimum inner edge.

[0049] Between the first hole portion b, the second hole portion c and the third hole portion d of the outer sleeve 2 in this application, the inner diameter difference between adjacent holes forms a limiting step for the tube removal bushing 1 and a limiting step for the annular retaining ring 3, which can prevent the tube removal bushing 1 and the retaining ring from axially falling off in turn.

[0050] The inner side of the inner ferrule 6 in the present application is provided with an inwardly convex small circular limiting protrusion i, which can limit the insertion depth of the pipe to be connected; the outer diameter of the docking part is adapted to the inner diameter of the third hole portion d, so that the docking part can be inserted into the outer ferrule 2 and docked with the outer ferrule 2, and the installation stop j is used to limit the insertion depth of the docking part and play the role of installation termination. Here, the docking part and the third hole portion d can also be connected and fixed by setting a reverse buckle, thread or welding.

[0051] In this embodiment, the annular retaining ring 3 and the washer 4 are arranged inside the third hole portion d and are confined between the inner ferrule 6 and the limiting step of the annular retaining ring 3 to prevent axial movement. The inner diameter of the first hole portion of the outer ferrule 2 is adapted to the outer diameter of the pipe removal bushing 1. The limiting step of the pipe removal bushing 1 cooperates with the annular retaining ring 3 to prevent axial movement of the pipe removal bushing 1. The maximum outer edge of the annular retaining ring 3 in this embodiment abuts between the washer 4 and the limiting step of the annular retaining ring 3, and the portion near the minimum inner edge is inclined toward the inner ferrule 6, with the pressing portion n pressing against the portion near the minimum inner edge. Preferably, the annular retaining ring 3 uses a uniformly distributed claw-type hard metal retaining ring made of a hard, rust-proof metal, such as stainless steel, which has a high elastic modulus and good rust-proof function, thereby improving product life and reliability and increasing the pipe's pull-out resistance.

[0052] In this embodiment, the inner diameters of the pipe bushing 1 and the inner ferrule 6 are both compatible with the outer diameter of the pipe to be connected. In this embodiment, the outer ferrule 2 is provided with an anti-pullout projection f, and the inner ferrule 6 is provided with a protruding mounting stop j. After secondary injection molding to form the overmolding material, the anti-pullout projection f and the mounting stop j cooperate with the overmolding material to prevent the inner ferrule 6 and the outer ferrule 2 from separating.

[0053] In some preferred embodiments, a positioning boss a is provided on the end face of the outer ferrule 2 close to the first hole portion to ensure that the insert component is accurately positioned when placed in the mold for secondary injection molding and to prevent the component from shaking during the injection molding process.

[0054] In some preferred embodiments, the outer diameter of the positioning boss a is smaller than the outer diameter of the outer sleeve 2 where the positioning boss a is located, that is, a space is left on the end face of the outer sleeve 2 where the positioning boss a is set to form a sealing plane e with the secondary injection molded plastic.

[0055] In some preferred embodiments, a large, inwardly concave annular step h is provided on the inner side of the docking portion. This step h and the gasket 4 form an annular groove for accommodating a sealing ring 5, within which the sealing ring 5 is positioned. The diameter of the annular groove at its bottom is comparable to the outer diameter of the sealing ring 5, providing space for installation and compression of the sealing ring 5. The inner diameter of the sealing ring 5 can be appropriately smaller than the outer diameter of the pipe to be connected, enabling the sealing ring 5 to provide a seal when inserted into the pipe to be connected. Specifically, the cross-section of the sealing ring 5 can be circular or shaped.

[0056] In some preferred embodiments, an annular groove 1 is provided on the outer side of the inner ferrule 6, within which an insert sealing ring 7 is disposed. The diameter of the groove bottom is comparable to the inner diameter of the insert sealing ring 7, providing space for installation and accommodation of the insert sealing ring 7. The outer diameter of the insert sealing ring 7 can be appropriately larger than that of the inner ferrule 6, providing a sealing effect after secondary injection molding. Specifically, the cross-section of the insert sealing ring 7 can be circular or shaped.

[0057] In some preferred embodiments, a support structure k is provided on the inner side of the inner ferrule 6, and the support structure k is provided at one end of the inner ferrule 6 away from the outer ferrule 2. This can accommodate the overmolding material during secondary injection molding, providing more reliable radial stress for the product to bear pressure.

[0058] In some preferred embodiments, the outer diameter of the pressing portion n gradually decreases in a direction approaching the annular retaining spring.

[0059] In some preferred embodiments, the angle between the outer surface of the pressing portion n and the axis is smaller than the angle between the smallest inner edge of the annular retaining spring 3 and the axis.

[0060] While the pressing portion n and the annular retaining spring 3 are pressed against each other near the minimum inner edge, the outer surface of the pressing portion n and the minimum inner edge of the annular retaining spring 3 are set at an inclination, so that when the pipe installed on the pipe removal bushing 1 is subjected to an outward external force, the annular retaining spring 3 and the pressing portion n press against each other, which can maintain the clamping force on the pipe, which is conducive to maintaining the stable installation of the pipe and preventing the pipe from detaching from the pipe removal bushing 1.

[0061] Another embodiment of the present application provides a pipe quick-connect joint, as shown in FIG5 , comprising a pipe body 8 , wherein the pipe body 8 is provided with an insert assembly for a pipe quick-connect joint according to any one of the aforementioned embodiments.

[0062] The pipe body 8 in this embodiment can be made of general-grade plastic resin, which can be but not limited to PE, PP-R, PVC, ABS, PB, POM, PA and other plastics, and is obtained by an integral injection molding process. The integral injection-molded body structure is firm and durable, and has a beautiful appearance.

[0063] The pipe quick-connect joint of this embodiment is obtained by pre-assembling the pipe quick-connect joint with an insert component, then placing it into a mold as an insert, and performing secondary injection molding and encapsulation to complete the molding of the pipe body 8.

[0064] When the pipe quick connect connector in this embodiment is used, the pipe to be connected can be directly inserted into the through hole in the middle of the insert component. Since the annular retaining spring 3 is inclined toward the inner sleeve 6 near the minimum inner edge, the connected pipe will not encounter too much resistance when inserted; however, if the pipe to be connected is to be pulled out, the friction between the annular retaining spring 3 and the surface of the pipe to be connected near the minimum inner edge will increase, and the annular retaining spring 3 near the minimum inner edge will be deformed and moved away from the inner sleeve 6 under the action of the pipe to be connected. At this time, the pressing portion n will hinder the deformation of the annular retaining spring 3 on the one hand, and on the other hand, the pressing portion n will also deform under the action of the retaining spring, increasing the clamping force of the pressing portion n on the pipe to be connected, thereby making it more difficult to pull out the pipe to be connected, reducing or avoiding the risk of the pipe to be connected and the pipe quick connect connector being detached.

[0065] In some preferred embodiments, each of the pipe fitting bodies 8 includes two or more insert assemblies for pipe quick-connect joints.

[0066] The axial angle between two or more insert components in the pipe quick-connect joint in this embodiment can be adjusted before secondary injection molding and overmolding; the outer diameters of the connecting pipes adapted by the two or more insert components can be independently set and selected without affecting each other; in terms of quantity, as long as there is sufficient space and equipment, the number of insert components corresponding to each of the pipe main bodies 8 can also be unrestricted. Therefore, the pipe quick-connect joint in this embodiment can be applicable to but not limited to straight-through (equal / reducing diameters), elbows (equal / reducing diameters), tees (equal / reducing diameters), and four-way joints (equal / reducing diameters); internal / external threaded straight-through joints (equal / reducing diameters), internal / external threaded elbows (equal / reducing diameters), internal / external threaded tees (equal / reducing diameters), and bridge four-way joints; quick-plug ends of water delivery accessories such as quick-plug valves, quick-plug plugs, quick-plug faucets, quick-plug double seats, and quick-plug filters.

[0067] In some preferred embodiments, an inner bushing 9 is further included. The inner bushing 9 includes an inserting portion for inserting into the pipe to be connected, and the inserting portion extends to the inner side of the annular retaining ring 3 .

[0068] In some preferred embodiments, one end of the extending portion is provided with an outward convex limiting platform capable of cooperating with the small circular ring limiting protrusion i.

[0069] In some preferred embodiments, the outer convex limit platform is located on the side of the small ring limit protrusion i close to the pipe removal bushing 1, and an accommodating cavity for inserting the pipe to be connected is provided between the inner bushing 9 and the pipe removal bushing 1.

[0070] In this embodiment, when the pipe wall of the pipe to be connected is easily deformed, it will be concave when it is squeezed by the annular retaining spring 3, thereby increasing the risk of separation between the pipe to be connected and the joint. Therefore, an inner sleeve 9 can be provided. The inner sleeve 9 plays a supporting role for the pipe to be connected on the inner side of the pipe to be connected, preventing the pipe to be connected from being deformed when it is squeezed by the annular retaining spring 3, thereby increasing the difficulty of separation between the pipe to be connected and the joint.

[0071] The pipe quick connect connector in this application has the following advantages:

[0072] The structure and installation process of existing quick-insert pipe fittings are simplified. The threaded clamping structure is no longer used, and torque wrenches and other tools are no longer needed during installation. The number of sealing rings 5 ​​or sealing gaskets used is reduced, and only one sealing ring 5 is needed to achieve the purpose of preventing water leakage. The sealing ring 5 is added between the insert and the body to improve the pressure bearing capacity of the pipe fitting. The use of evenly distributed claw-type hard metal retaining springs has a greater clamping force and better anti-slip effect, and the pull-out resistance between the pipe and the fitting is qualitatively improved.

[0073] During installation, you only need to align the connecting pipe with the joint mouth, push it hard, and insert the pipe into the bottom position of the pipe socket. The installation is very convenient.

[0074] The connection technology of the connector of the present application can realize the mutual connection between plastic pipes of different materials such as polypropylene, polyethylene, polybutylene, polyvinyl chloride, heat-resistant polyethylene, cross-linked pipes, etc. through direct insertion mechanical connection and other methods. It is easy to construct and has strong practicality.

[0075] By adopting the product manufacturing technology of the present application, except for the retaining ring which adopts the stamping process, the remaining parts can be completed by injection molding, which can achieve rapid and automated production without the need for subsequent processing, saving costs and improving production efficiency.

[0076] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure shall be included within the scope of protection of the present disclosure. Industrial Applicability

[0077] The disclosed pipe quick-connect fitting and its insert assembly can be used to install plastic pipes in a straight-insert manner and can be applied in the fields of civil water supply, agricultural irrigation, and special fluids. It has the advantages of being environmentally friendly, durable, reliable, and having a wide range of uses. Secondly, the disclosed quick-connect fitting can be used to connect plastic pipes of different materials, which is practical, fast, convenient, and reliable. The disclosed pipe fitting and the insert assembly can both be injection molded, and the product wall thickness is uniform and single, and the overall structure is strong. Compared with traditional nut-type quick-connect fittings, it eliminates the production process such as thread assembly, shortens the production cycle, reduces material and production costs, and eliminates the risk of the nut loosening and falling out. It has obvious product advantages and is more conducive to industrial application.

Claims

1. An insert assembly for a pipe quick-connect joint, characterized in that: It includes a pipe removal bushing, an outer ferrule, an inner ferrule, an annular retaining ring and a gasket, wherein: The inner side of the outer ferrule is provided with a first hole portion, a second hole portion and a third hole portion in sequence along the axial direction, the diameters of the first hole portion, the second hole portion and the third hole portion gradually increase, a tube removal bushing limiting step is formed at the connection between the first hole portion and the second hole portion, and an annular retaining spring limiting step is formed at the connection between the second hole portion and the third hole portion; an anti-pull-off boss is also provided on the outer side of the outer ferrule; The inner side of the inner ferrule is provided with an inwardly convex small circular ring limiting protrusion, the outer side of the inner ferrule is provided with an outwardly protruding mounting stop, and the mounting stop is provided with a docking portion extending into the third hole portion to dock with the outer ferrule on the side away from the small circular ring limiting protrusion; The washer is arranged between the docking portion and the annular retaining spring limiting step, the maximum outer edge of the annular retaining spring abuts between the washer and the annular retaining spring limiting step, the inner diameter of the annular retaining spring near the minimum inner edge is smaller than the inner diameter of the tube removal bushing, and the annular retaining spring is inclined toward the direction close to the inner sleeve near the minimum inner edge, the tube removal bushing is arranged on the side of the annular retaining spring away from the inner sleeve, a limiting portion adapted to the limiting step of the tube removal bushing is arranged on the tube removal bushing, and a pressing portion abutting against the annular retaining spring near the minimum inner edge is arranged on the side of the limiting portion close to the annular retaining spring.

2. The insert assembly for a pipe quick-connect joint according to claim 1, characterized in that: A positioning boss is arranged on the end surface of the outer ferrule close to the first hole portion.

3. The insert assembly for a pipe quick-connect joint according to claim 2, characterized in that: The outer diameter of the positioning boss is smaller than the outer diameter of the outer ferrule where the positioning boss is located.

4. The insert assembly for a pipe quick-connect joint according to any one of claims 1 to 3, characterized in that: A large concave annular step is arranged on the inner side of the docking portion, and the large annular step and the gasket form an annular groove for accommodating a sealing ring.

5. The insert assembly for a pipe quick-connect joint according to any one of claims 1 to 4, characterized in that: An annular groove is arranged on the outer side of the inner ferrule.

6. The insert assembly for a pipe quick-connect joint according to claim 5, characterized in that: An insert sealing ring is arranged in the annular groove.

7. The insert assembly for a pipe quick-connect joint according to any one of claims 1 to 6, characterized in that: A support structure is arranged on the inner side of the inner ferrule, and the support structure is arranged on an end of the inner ferrule away from the outer ferrule.

8. The insert assembly for a pipe quick-connect joint according to any one of claims 1 to 7, characterized in that: The outer diameter of the pressing portion gradually decreases along a direction approaching the annular clamping spring.

9. The insert assembly for a pipe quick-connect joint according to claim 8, characterized in that: The included angle between the outer surface of the pressing portion and the axis is smaller than the included angle between the minimum inner edge of the annular retaining spring and the axis.

10. The insert assembly for a pipe quick-connect joint according to any one of claims 1 to 9, characterized in that: The annular retaining spring is a claw-type hard metal retaining spring.

11. A pipe quick-connect connector, characterized in that: It comprises a pipe fitting body, in which the insert assembly for a pipe quick-connect joint according to any one of claims 1 to 10 is arranged.

12. The pipe quick-connect connector according to claim 11, characterized in that: Each of the pipe fitting bodies includes more than two insert components for pipe quick-connect joints.

13. The pipe quick-connect connector according to claim 11 or 12, characterized in that: The main body material of the pipe fitting is at least one of PE, PP-R, PVC, ABS, PB, POM and PA.

14. The pipe quick-connect connector according to any one of claims 11 to 13, characterized in that: It also includes an inner bushing, which includes an inserting portion for inserting into the pipe to be connected, and the inserting portion extends to the inner side of the annular retaining ring.

15. The pipe quick-connect connector according to claim 14, characterized in that: One end of the extending portion is provided with an outer convex limiting platform which can cooperate with the small circular ring limiting protrusion.

16. The pipe quick-connect connector according to claim 15, characterized in that: The outer convex limiting platform is located on a side of the small circular limiting protrusion close to the pipe removal bushing, and an accommodating cavity for inserting the pipe to be connected is provided between the inner bushing and the pipe removal bushing.

Images