Female connection assembly and quick coupling with improved plug reliability

Abstract

This utility model discloses a female end connection assembly and a quick connector to improve the reliability of insertion and removal. The female end connection assembly includes: an inner fixed sleeve having an axially extending inner sleeve with an arc-shaped through hole and a front end limiting part; a female end connector connected to the tail end of the inner sleeve; an outer movable sleeve fitted around the outer periphery of the inner sleeve; the inner peripheral sidewall of the outer sleeve having an anti-disengagement step, a first clearance groove, a locking protrusion, and a second clearance groove; an annular movable retaining ring fitted around the outer periphery of the inner sleeve; a telescopic spring fitted around the outer periphery of the inner sleeve, with its two ends acting on the annular movable retaining ring, the inner sleeve, or the female end connector, respectively; and a locking element having a body and an outer peripheral limiting part. The body extends into the arc-shaped through hole and can move radially and axially. Thus, this locking element can provide a larger contact surface, resulting in lower contact pressure during insertion and removal, less wear, and significantly increasing the number of insertion and removal uses.

Description

Technical Field

[0001] This utility model relates to the field of quick connectors, and in particular to a female end connection assembly and quick connector that improves the reliability of insertion and removal. It is mainly used as a quick connector for liquid applications, but can also be used as a quick connector for gas applications. Background Technology

[0002] Quick couplings mainly include pneumatic quick couplings and hydraulic quick couplings. Commercially available quick couplings include pluggable male and female couplings. Currently, the industry standard uses steel balls to lock the male and female couplings together.

[0003] Typically, a male connector includes a male connector body, with a protrusion on the outer side of the male connector body. This protrusion is circumferentially located on the outer side of the insertion portion and has an inclined pushing surface and an inclined positioning surface. The pushing surface and the positioning surface are respectively formed inclined from both sides of the top surface of the protrusion (which is a plane) towards the front and rear ends of the male connector body, and the inclination direction of the pushing surface is different from that of the positioning surface. A steel ball is disposed on the female connector, which includes a female front shell, a female rear shell, and an outer sliding sleeve. The female front shell has a through hole into which a steel ball is disposed. A spring is disposed between the outer sliding sleeve and the female rear shell. When the male connector is inserted, the protrusion compresses the steel ball, which pushes the outer sliding sleeve forward. After insertion, the spring returns to its original position, thus locking the steel ball to the protrusion. To unlock, the outer sliding sleeve is pushed first, and then the male connector is pulled out. Under the compression of the male connector, the steel ball retracts into the relief groove of the outer sliding sleeve, allowing the male connector to be pulled out.

[0004] During insertion and removal, the male connector's protrusion and outer sleeve make point contact with the steel ball. The contact pressure is high, making it prone to wear. Typically, after 8,000 to 10,000 uses, the insertion and locking mechanism will fail. In particular, steel balls purchased on the market may have quality deviations in terms of hardness, roundness, and dimensional tolerances. At the same time, the male connector's protrusion is generally made of stainless steel. When in contact, the steel ball is against the stainless steel, which is hard against hard and prone to wear, further reducing the actual number of insertion and removal uses.

[0005] Therefore, it is necessary to research a new technical solution to address the above problems. Utility Model Content

[0006] In view of this, the present invention addresses the deficiencies of the existing technology, and its main purpose is to provide a female end connection component and quick connector that improves the reliability of insertion and removal. It can provide a larger contact surface, and the contact pressure is small during insertion and removal, making it less prone to wear and significantly increasing the number of insertion and removal uses.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A female connector assembly for improving insertion and removal reliability includes:

[0009] An inner fixed sleeve has an axially extending inner sleeve; the outer periphery of the inner sleeve is provided with an arc-shaped through hole that extends axially and radially penetrates the inner and outer peripheral sidewalls of the inner sleeve; the outer periphery of the first end of the inner sleeve has a first end limiting part.

[0010] The female connector is connected to the tail end of the inner sleeve;

[0011] The outer movable sleeve has an axially extending outer sleeve that is fitted around the outer periphery of the inner sleeve. The inner periphery of the outer sleeve has an anti-detachment step, a first clearance groove, a locking protrusion, and a second clearance groove arranged sequentially from the first end to the last end. The anti-detachment step is restricted by the first end limiting part to prevent the outer movable sleeve from detaching from the first end.

[0012] An annular movable retaining ring is fitted around the outer circumference of the inner sleeve and can be axially displaced to be located on the tail end side of the locking protrusion.

[0013] A telescopic spring is fitted around the outer circumference of the inner sleeve; the first end of the telescopic spring acts on the annular movable retaining ring, and the last end of the telescopic spring acts on the inner sleeve or the female end connector.

[0014] The locking element has a body and an outer peripheral limiting part connected to the body; the body extends into the arc-shaped through hole and can be radially and axially displaced; the outer peripheral limiting part is located on the outer periphery of the inner sleeve; the first end limiting part, the anti-detachment step, the locking element, the annular movable retaining ring, and the telescopic spring are arranged sequentially from the first end to the last end.

[0015] As a preferred embodiment, in both the natural and locked states, the axial ends of the locking element are respectively constrained by the inner sidewall of the first end of the arc-shaped through hole and the annular movable retaining ring, while the radial outer periphery of the locking element is constrained by the locking protrusion.

[0016] When the insertion is complete and the insertion force is not released, the locking element is located in the second clearance groove. The axial ends of the locking element are respectively restricted by the annular movable retaining ring and the inner side wall of the arc-shaped through hole near the tail end, and the telescopic spring is compressed and shortened.

[0017] When the insertion is complete and the insertion force is released, the locking element is reset towards the head end by the reset force of the telescopic spring. The radial outer periphery of the locking element is restricted by the locking protrusion, and the axial ends of the locking element are respectively restricted by the inner side wall of the arc-shaped through hole near the head end and the annular movable retaining ring. The self-locking protrusion of the male end connecting assembly is restricted by the side of the locking element facing the tail end.

[0018] As a preferred embodiment, several locking components are provided, with their spacing evenly distributed along the circumference. Correspondingly, several arc-shaped through holes are provided, with their spacing evenly distributed along the circumference.

[0019] As a preferred embodiment, the radial inner end of the main body is a gradually tapering cone, and the radial inner end face of the main body is an arc-shaped surface, which is concentrically arranged with the inner circumferential sidewall of the inner sleeve.

[0020] As a preferred embodiment, the radial inner end of the body has an arc-shaped guide surface facing the head end, and the radial inner end of the body has a stop slope facing the tail end.

[0021] As a preferred embodiment, the locking protrusion has an unlocking guide surface facing the first clearance groove and a locking guide surface facing the second clearance groove.

[0022] As a preferred embodiment, the annular movable retaining ring has a first fitting surface and a second fitting surface on the front end side, and the first fitting surface and the second fitting surface are arranged radially inward in sequence; the first fitting surface is fitted and limited by the locking guide surface, and the second fitting surface is fitted with the rear end side of the locking fastener.

[0023] As a preferred option, the locking component is an injection-molded part, while the inner fixing sleeve, outer movable sleeve, and annular movable retaining ring are metal parts.

[0024] As a preferred option, the inner fixing sleeve is also equipped with a sealing valve core assembly.

[0025] A quick connector includes a pluggable female connection assembly and a male connection assembly; the female connection assembly is any of the preceding female connection assemblies that improve pluggability and pluggability, and the male connection assembly includes a male connector and a male socket, the outer periphery of which is provided with a self-locking protrusion.

[0026] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly achieves this through the structural design of the inner fixed sleeve, outer movable sleeve, annular movable retaining ring, telescopic spring, and locking fastener. The outer periphery of the inner fixed sleeve is provided with an arc-shaped through hole that extends axially and radially penetrates the inner and outer peripheral sidewalls of the inner sleeve. The outer periphery of the first end of the inner sleeve has a first end limiting part. The inner peripheral sidewall of the outer movable sleeve has an anti-disengagement step and a first clearance recess arranged sequentially from the first end to the tail end. The groove, locking protrusion, and second clearance groove, along with the anti-disengagement step, are limited by the first end limiting part to prevent the outer movable sleeve from disengaging from the first end. The annular movable retaining ring is sleeved on the outer periphery of the inner sleeve and can be axially displaced on the locking protrusion facing the tail end. The locking element has a body part and an outer peripheral limiting part connected to the body part. The body part extends into the arc-shaped through hole and can be radially and axially displaced. During insertion and removal, the locking element can provide a larger contact surface, lower contact pressure, and is less prone to wear, significantly increasing the number of insertion and removal uses.

[0027] Moreover, it provides more stable support and better insertion and removal reliability; the locking component can be made of plastic, which is easy to manufacture by injection molding and easy to design the curvature as needed to form a sufficiently large contact area. At the same time, the size and shape of the locking component are well controllable. The forming accuracy of the arc-shaped guide surface, stop slope, and arc surface of the radial inner end of the locking component body is controllable and easy to control. The locking protrusion of the locking component and the male end connection component is made of plastic and stainless steel friction, which is soft and hard and not easy to wear, further improving the insertion and removal life.

[0028] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0029] Figure 1 This is an exploded perspective view of the female end connection component and the male end connection component according to an embodiment of the present utility model;

[0030] Figure 2 This is an exploded perspective view of the female end connection component according to an embodiment of the present utility model;

[0031] Figure 3 This is a partial structural diagram of the female end connection component according to an embodiment of the present utility model;

[0032] Figure 4 This is a perspective view of the locking component according to an embodiment of the present utility model;

[0033] Figure 5 This is a cross-sectional view of the female end connection assembly according to an embodiment of the present utility model;

[0034] Figure 6 This is another cross-sectional view of the female end connection assembly according to an embodiment of the present utility model (outer movable sleeve not shown).

[0035] Figure 7 This is another cross-sectional view of the female end connection assembly according to an embodiment of the present utility model;

[0036] Figure 8 yes Figure 7 A magnified view of a portion of the image;

[0037] Figure 9 This is a cross-sectional view of the male end connection component of this utility model when it is ready to be inserted into the female end connection component;

[0038] Figure 10 This is a cross-sectional view of the male end connecting component of this utility model inserted into the female end connecting component before the locking member is pressed;

[0039] Figure 11 yes Figure 10 A magnified view of a portion of the image;

[0040] Figure 12 This is a cross-sectional view of an embodiment of the present invention, showing the male end connecting component inserted into the female end connecting component and the locking member squeezed into the second clearance groove;

[0041] Figure 13 yes Figure 12 A magnified view of a portion of the image;

[0042] Figure 14 The cross-sectional view of the male end connecting component of this utility model being inserted further into the female end connecting component, while the telescopic spring retracts the locking element to form a self-locking mechanism;

[0043] Figure 15 yes Figure 14 A magnified view of a portion of the image;

[0044] Figure 16 This is a cross-sectional view of the outer movable sleeve when it is pulled toward the tail end according to an embodiment of this utility model (unlocking required);

[0045] Figure 17 yes Figure 16 A magnified view of a portion of the image. Detailed Implementation

[0046] Please refer to Figures 1 to 17 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0047] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] A female end connection assembly 100 for improving insertion and removal reliability includes: an inner fixed sleeve 101, a female end connector 102, an outer movable sleeve 103, an annular movable retaining ring 105, a telescopic spring 106, and a locking element 108.

[0049] The inner fixing sleeve 101 has an axially extending inner sleeve; the outer periphery of the inner sleeve is provided with an arc-shaped through hole 1011 that extends axially and radially penetrates the inner and outer peripheral sidewalls of the inner sleeve; the outer periphery of the first end of the inner sleeve has a first end limiting portion; the outer periphery of the first end of the inner sleeve has a stop portion 1012, and a stop groove is usually provided on the side of the stop portion 1012 away from the first end of the inner sleeve. A circular retaining spring 104 is also provided, which is sleeved on the first end of the inner sleeve to protrude from the inner sleeve. Specifically, the circular retaining spring 104 is embedded in the stop groove on the outer periphery of the inner sleeve. The stop part 1012 is flush with the other end surface of the stop groove, which is equivalent to the circular retaining spring 104 serving as the first end limiting part. Of course, if the stop part 1012 protrudes slightly from the first end of the outer periphery of the inner sleeve, and the circular retaining spring 104 is fitted on the outer periphery of the inner sleeve, the stop part 1012 can play the role of first end limiting to prevent the circular retaining spring 104 from coming out, which is also a feasible design.

[0050] The female end connector 102 is connected to the tail end of the inner sleeve. The connection method includes separate connection or integral connection, that is, the female end connector 102 and the inner fixed sleeve 101 can be an integral part.

[0051] The outer movable sleeve 103 has an axially extending outer sleeve, which is fitted onto the outer periphery of the inner sleeve near the first end. The inner periphery sidewall of the outer sleeve has an anti-detachment step 1031, a first clearance groove 1033, an annular locking protrusion 1032 (not limited to annular in actual design), and a second clearance groove 1035 arranged sequentially from the first end to the last end. The anti-detachment step 1031 is restricted by the first end limiting part to prevent the outer movable sleeve 103 from detaching from the first end. The inner wall surface of the outer sleeve has an annular groove 1034 on the side of the anti-detachment step 1031 facing the first end, for accommodating a circular retaining spring 104. The radial inner end of the anti-detachment step 1031 extends beyond the radial inner end of the annular locking protrusion 1032 and slides in contact with or maintains a small gap on the outer periphery surface of the inner sleeve. In this way, when the outer movable sleeve 103 is pulled towards the last end, on the one hand, the pulling balance is better, and on the other hand, it will not cross the locking member 108.

[0052] The annular movable retaining ring 105 is sleeved on the outer periphery of the inner sleeve near the first end; half of the difference between the inner and outer diameters of the annular movable retaining ring 105 (also referring to the ring width or radial wall thickness) is slightly smaller than the groove depth of the second clearance groove 1035 and larger than the radial wall thickness of the annular locking protrusion 1032, so that the annular movable retaining ring 105 will not extend beyond the annular locking protrusion 1032 towards the first end.

[0053] The telescopic spring 106 is sleeved on the outer periphery of the inner sleeve; the first end of the telescopic spring 106 acts on the annular movable retaining ring 105, and the tail end of the telescopic spring 106 acts on the inner sleeve or the female end connector 102.

[0054] The locking member 108 has a body portion 1081 and an outer peripheral limiting portion 1082 connected to the body portion 1081. The body portion 1081 is arc-shaped, and the arc shape is concentrically arranged with the inner peripheral sidewall of the inner sleeve. The outer peripheral limiting portion 1082 extends from both circumferential ends of the body portion 1081 to exceed the circumferential ends of the body portion 1081. Typically, the outer peripheral sidewall of the outer peripheral limiting portion 1082 is flush with the arc shape of the outer peripheral sidewall of the body portion 1081, that is, it is located on the same circle. The outer sleeve has an arc-shaped surface and is concentrically arranged with the inner circumferential sidewall of the outer sleeve. At the same time, the inner and outer circumferential sidewalls of the outer peripheral limiting part 1 are concentrically arranged with the outer circumferential sidewalls of the inner and outer sleeves. The main body part 1081 extends into the arc-shaped through hole 1011 and can be radially and axially displaced. The outer peripheral limiting part 1082 is located on the outer periphery of the inner sleeve. The first end limiting part, the anti-detachment step 1031, the locking fastener 108, the annular movable retaining ring 105, and the telescopic spring 106 are arranged sequentially from the first end to the last end.

[0055] In both the natural and locked states, the axial ends of the locking member 108 are respectively limited by the inner sidewall of the first end of the arc-shaped through hole 1011 and the annular movable retaining ring 105, and the radial outer periphery of the locking member 108 is limited by the annular locking protrusion 1032.

[0056] When the insertion is complete and the insertion force is not released, the locking member 108 is located in the second clearance groove 1035. The axial ends of the locking member 108 are respectively restricted by the annular movable retaining ring 105 and the inner side wall of the arc-shaped through hole 1011 near the tail end. The telescopic spring 106 is compressed and shortened.

[0057] When inserted into place and the insertion force is released, the locking member 108 is reset towards the head end by the reset force of the telescopic spring 106. The radial outer periphery of the locking member 108 is constrained by the annular locking protrusion 1032, and the axial ends of the locking member 108 are respectively constrained by the inner sidewall of the arc-shaped through hole 1011 near the head end and the annular movable retaining ring 105. The self-locking protrusion 201 of the male end connection assembly 200 is constrained by the tail end side of the locking member 108. The locking protrusion 201 is a common male end connection assembly. The locking structure of component 200 typically features a locking protrusion 201 that is annular with a frustoconical cross-section. A first tapered conical circumferential surface 2011 is provided on the side of the locking protrusion 201 facing the female end connecting component 100, and a second tapered conical circumferential surface 2012 is provided on the side of the locking protrusion 201 facing away from the female end connecting component 100. An annular circumferential surface is connected between the first tapered conical circumferential surface 2011 and the second tapered conical circumferential surface 2012, which is concentrically arranged with the inner circumferential sidewall of the inner sleeve.

[0058] When unlocking, pull the outer movable sleeve 103 toward the tail end so that the first clearance groove 1033 is aligned with the locking member 108. Then pull the male end connecting component 200 from the head end. Under the squeezing action of the locking protrusion 201 of the male end connecting component 200, the locking member 108 is radially displaced outward and enters the first clearance groove 1033 to avoid the locking protrusion 201, so that the male end connecting component 200 can be smoothly pulled out.

[0059] The locking fasteners 108 are provided in a plurality of units, evenly spaced along the circumference. Correspondingly, the arc-shaped through holes 1011 are provided in a plurality of units, evenly spaced along the circumference. In this embodiment, four through holes are provided, which are arranged in pairs facing each other radially and are of the same size.

[0060] The radially inner end of the body portion 1081 is tapered, with an arc-shaped guide surface 1083 facing the head end and a stop slope 1084 facing the tail end. The radially inner end of the body portion 1081 has an arc-shaped surface 1085, which is concentrically arranged with the inner circumferential sidewall of the inner sleeve, and connects between the arc-shaped guide surface 1083 and the stop slope 1084. Further, the arc-shaped surface 1085 and the stop slope 1084 are transitionally connected by a rounded arc surface 1086.

[0061] The annular locking protrusion 1032 has an unlocking guide surface 1036 facing the first clearance groove 1033 and a locking guide surface 1037 facing the second clearance groove 1035. Both are usually conical circumferential surfaces. The unlocking guide surface 1036 is gradually expanding towards the head end, and the locking guide surface 1037 is gradually expanding towards the tail end. The locking guide surface 1037 and the unlocking guide surface 1036 are connected by an annular abutment surface, which is concentrically arranged (or understood as being arranged on the same central axis) with the outer peripheral surface of the main body 1081 and the inner peripheral sidewall of the inner sleeve. The annular movable retaining ring 105 has a first adapter surface 1051 and a second adapter surface 1052 on the front end side. The first adapter surface 1051 and the second adapter surface 1052 are arranged radially inward in sequence. The first adapter surface 1051 is adapted to and limited by the locking guide surface 1037, and the second adapter surface 1052 is adapted to the rear end side of the locking member 108.

[0062] The locking component 108 is an injection-molded part, while the inner fixing sleeve 101, the outer movable sleeve 103, and the annular movable retaining ring 105 are metal parts. The friction between the plastic and stainless steel, with its combination of softness and hardness, makes it less prone to wear and further improves the insertion and removal life.

[0063] Furthermore, a sealing valve core assembly 107 is also installed inside the inner fixing sleeve 101. The specific form of the sealing valve core assembly 107 is not limited.

[0064] In addition, a quick connector is provided, which includes a pluggable and conductive female terminal connection assembly 100 and a male terminal connection assembly 200; the female terminal connection assembly 100 is any of the female terminal connection assemblies described above, and the male terminal connection assembly 200 includes a male terminal connector and a male terminal socket, wherein the outer periphery of the male terminal socket is provided with a self-locking protrusion 201.

[0065] Therefore, for quick connectors, only the design of the female connection component 100 needs to be modified to adapt to the original male connection component 200.

[0066] Actual testing showed that the mating reliability of this type of female connector 100 was significantly better, and its mating life was longer, increasing to over 20,000 cycles compared to the previous life of 8,000 to 10,000 cycles.

[0067] Please refer to Figures 8 to 17 As shown, the insertion and removal process is described below:

[0068] like Figure 8 and Figure 9As shown, it displays a cross-sectional view of the male end connection assembly 200 being prepared to be inserted into the female end connection assembly 100. At this time, the female end connection assembly 100 is in its natural state. The axial ends of the locking member 108 are respectively limited by the inner side wall of the arc-shaped through hole 1011 near the head end and the second mating surface of the annular movable retaining ring 105. The radial outer periphery of the locking member 108 is limited by the annular abutment surface of the annular locking protrusion 1032. At this time, the radial inner end of the body part 1081 of the locking member 108 protrudes into the interior of the inner sleeve, occupying part of the insertion cavity space.

[0069] like Figure 10 and Figure 11 As shown, it shows a cross-sectional view of the male end connection assembly 200 inserted into the female end connection assembly 100 before the locking member 108 is pressed; at this time, the first tapered conical circumferential side surface 2011 of the locking protrusion 201 and the portion of the radial inner end of the body portion 1081 of the locking member 108 protruding into the inner sleeve form an axial overlap.

[0070] like Figure 12 and Figure 13 As shown, it displays a cross-sectional view of the male end connecting assembly 200 inserted into the female end connecting assembly 100 and the locking member 108 squeezed into the second clearance groove 1035; as the first tapering conical circumferential surface 2011 of the locking member 108 pushes forward against the arc-shaped guide surface 1083, the locking member 108 is displaced towards the tail end and undergoes radial displacement, so that the locking member 108 is squeezed into the second clearance groove 1035; at this time, the annular circumferential surface located between the first tapering conical circumferential surface 2011 and the second tapering conical circumferential surface 2012 forms an inner and outer ring abutment with the arc-shaped surface 1085; the axial ends of the locking member 108 are respectively restricted by the locking guide surface 1037 and the second fitting surface of the annular movable retaining ring 105, and the locking member 108 approaches or contacts the inner side wall of the arc-shaped through hole 1011 near the tail end, the telescopic spring 106 is compressed and is in an energy storage state.

[0071] like Figure 14 and Figure 15As shown, it displays a cross-sectional view of the male end connecting assembly 200 being inserted further into the female end connecting assembly 100, while the telescopic spring 106 retracts the locking member 108 to the annular locking protrusion 1032 to form a self-locking mechanism. At this time, the axial ends of the locking member 108 are respectively restricted by the inner side wall of the arc-shaped through hole 1011 near the head end and the second fitting surface of the annular movable retaining ring 105. The radial outer periphery of the locking member 108 is restricted by the annular abutment surface of the annular locking protrusion 1032. At this time, the radial inner end of the body part 1081 of the locking member 108 protrudes into the interior of the inner sleeve, occupying part of the insertion cavity space. The second tapered conical circumferential side surface 2012 of the locking protrusion 201 is restricted by the stop slope surface 1084 of the locking member 108, forming a self-locking mechanism. At this time, the locking member cannot move radially or axially.

[0072] When unlocking is required, such as Figure 16 and Figure 17 As shown, it displays a cross-sectional view of the outer movable sleeve being pulled toward the tail end; the outer movable sleeve 103 is pulled toward the tail end (as shown in the image). Figure 16 (in the direction of the dashed arrow), so that the first clearance groove 1033 is positioned directly opposite the locking member 108, and then the male end connecting assembly 200 is pulled out from the first end (e.g. Figure 16 (in the direction of the solid line arrow), the locking member 108 is radially displaced outward and axially displaced towards the head end under the squeezing action of the locking protrusion 201 of the male end connecting component 200, so that it can enter the first avoidance groove 1033 to avoid the locking protrusion 201, and the male end connecting component 200 is smoothly pulled out.

[0073] The key design feature of this utility model lies in its structural design of the inner fixed sleeve, outer movable sleeve, annular movable retaining ring, telescopic spring, and locking fastener. The inner fixed sleeve has an arc-shaped through hole extending axially and radially through the inner and outer peripheral sidewalls of the inner sleeve. The outer periphery of the inner sleeve has a first-end limiting part. The inner peripheral sidewall of the outer movable sleeve has an anti-disengagement step, a first clearance groove, a locking protrusion, and a second clearance groove arranged sequentially from the first end to the tail end. The anti-disengagement step is limited by the first-end limiting part to prevent the outer movable sleeve from disengaging from the first end. The annular movable retaining ring is fitted around the outer periphery of the inner sleeve and can be axially displaced towards the tail end of the locking protrusion. The locking fastener has a body and an outer peripheral limiting part connected to the body. The body extends into the arc-shaped through hole and can be radially and axially displaced. During use, the locking fastener provides a larger contact surface, lower contact pressure, and is less prone to wear, significantly increasing the number of insertion and removal cycles.

[0074] Furthermore, the radial inner end of the main body has an arc-shaped surface, which provides more stable support and better insertion and removal reliability. The locking component can be made of plastic, which is easy to manufacture by injection molding and easy to design the curvature as needed to form a sufficiently large contact area. At the same time, the size and shape of the locking component are well controllable. The molding precision of the arc-shaped guide surface, stop slope, and arc-shaped surface of the radial inner end of the locking component's main body is controllable and easy to control. The locking protrusion of the locking component and the male end connection component is made of plastic and stainless steel friction, which is soft and hard and not easy to wear, further improving the insertion and removal life.

[0075] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A female terminal connection assembly for improving insertion and removal reliability, characterized in that, include: An inner fixed sleeve has an axially extending inner sleeve; the outer periphery of the inner sleeve is provided with an arc-shaped through hole that extends axially and radially penetrates the inner and outer peripheral sidewalls of the inner sleeve; the outer periphery of the first end of the inner sleeve has a first end limiting part. The female connector is connected to the tail end of the inner sleeve; The outer movable sleeve has an axially extending outer sleeve that is fitted around the outer periphery of the inner sleeve. The inner periphery of the outer sleeve has an anti-detachment step, a first clearance groove, a locking protrusion, and a second clearance groove arranged sequentially from the first end to the last end. The anti-detachment step is restricted by the first end limiting part to prevent the outer movable sleeve from detaching from the first end. An annular movable retaining ring is fitted around the outer circumference of the inner sleeve and can be axially displaced to be located on the tail end side of the locking protrusion. A telescopic spring is fitted around the outer circumference of the inner sleeve; the first end of the telescopic spring acts on the annular movable retaining ring, and the last end of the telescopic spring acts on the inner sleeve or the female end connector. The locking element has a body and an outer peripheral limiting part connected to the body; the body extends into the arc-shaped through hole and can be radially and axially displaced; the outer peripheral limiting part is located on the outer periphery of the inner sleeve; the first end limiting part, the anti-detachment step, the locking element, the annular movable retaining ring, and the telescopic spring are arranged sequentially from the first end to the last end.

2. The female terminal connection assembly for improving insertion and removal reliability according to claim 1, characterized in that, In both the natural and locked states, the axial ends of the locking fastener are restricted by the inner side wall of the first end of the arc-shaped through hole and the annular movable retaining ring, respectively, while the radial outer periphery of the locking fastener is restricted by the locking protrusion. When the insertion is complete and the insertion force is not released, the locking element is located in the second clearance groove. The axial ends of the locking element are respectively restricted by the annular movable retaining ring and the inner side wall of the arc-shaped through hole near the tail end, and the telescopic spring is compressed and shortened. When the insertion is complete and the insertion force is released, the locking element is reset towards the head end by the reset force of the telescopic spring. The radial outer periphery of the locking element is restricted by the locking protrusion, and the axial ends of the locking element are respectively restricted by the inner side wall of the arc-shaped through hole near the head end and the annular movable retaining ring. The self-locking protrusion of the male end connecting assembly is restricted by the side of the locking element facing the tail end.

3. The female terminal connection assembly for improving insertion and removal reliability according to claim 1, characterized in that, There are several locking fasteners, which are evenly distributed along the circumference. Correspondingly, there are several arc-shaped through holes, which are evenly distributed along the circumference.

4. The female terminal connection assembly for improving insertion and removal reliability according to claim 1, characterized in that, The radial inner end of the main body is tapered, and the radial inner end face of the main body is an arc-shaped surface, which is concentrically set with the inner circumferential sidewall of the inner sleeve.

5. The female terminal connection assembly for improving insertion and removal reliability according to claim 1, characterized in that, The radial inner end of the main body has an arc-shaped guide surface facing the head end, and the radial inner end of the main body has a stop slope facing the tail end.

6. The female terminal connection assembly for improving insertion and removal reliability according to claim 1, characterized in that, The locking protrusion has an unlocking guide surface facing the first clearance groove and a locking guide surface facing the second clearance groove.

7. The female terminal connection assembly for improving insertion and removal reliability according to claim 1 or 6, characterized in that, The annular movable retaining ring has a first adapter surface and a second adapter surface on the front end side, and the first adapter surface and the second adapter surface are arranged radially inward in sequence; the first adapter surface is adapted to the locking guide surface for limiting, and the second adapter surface is adapted to the rear end side of the locking fastener.

8. The female terminal connection assembly for improving insertion and removal reliability according to claim 1, characterized in that, The locking components are injection molded parts, while the inner fixed sleeve, outer movable sleeve, and annular movable retaining ring are metal parts.

9. The female terminal connection assembly for improving insertion and removal reliability according to claim 1, characterized in that, The inner fixed sleeve is also equipped with a sealing valve core assembly.

10. A quick connector comprising a pluggable, conductive female connector assembly and a male connector assembly; characterized in that, The female terminal connection assembly is the improved insertion and removal reliability female terminal connection assembly according to any one of claims 1 to 9, and the male terminal connection assembly includes a male terminal connector and a male terminal sleeve, with a self-locking protrusion provided on the outer periphery of the male terminal sleeve.

Images