Quick connector and female end connecting assembly

Abstract

The utility model discloses a quick connector and a female end connecting assembly. The quick connector comprises the female end connecting assembly and a male end connecting assembly which can be connected and conducted in a pluggable mode. The female end connecting assembly comprises a female end connector, an inner fixed sleeve, an outer movable sleeve, a fixed core rod, an annular movable plug, a steel ball, a first spring and a second spring. An annular boss is arranged on the inner wall of the inner fixing sleeve so that an inner hole of the inner fixing sleeve can be divided into a first inner hole section and a second inner hole section which are located at the two ends of the annular boss. The outer surface of the annular movable plug is designed into a first-section outer surface, a second-section outer surface and a third-section outer surface; the inner surface of the annular movable plug is designed into a first-section inner surface, a second-section inner surface and a third-section inner surface; therefore, after the plugging action and plugging, the guiding and positioning effects are good, loosening and liquid leakage are not easy to occur, the mutual plugging reliability of the female end connecting assembly and the male end connecting assembly is effectively improved, and the product competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the field of quick connector technology, in particular to a quick connector and a female end connection component. Background Art

[0002] A quick connector is a device that allows for quick disconnection or connection of pipes. It is mainly used as a quick connector for liquids, but can also be used as a quick connector for gas. The Universal Quick Disconnect (UQD) specification revision 1.0 standardizes the shape and size of UQD quick connectors, such as Figure 10 shown.

[0003] Currently, the industry has developed different structural designs for the specifications and sizes of universal quick disconnect (UQD) connectors (also known as UQD quick connectors). For example, CN 216692618 U discloses a quick connector locking mechanism, including a female connector and a male connector. The female connector includes a female valve body with a first flow channel, the female valve body having two oblique grooves extending through the peripheral wall of the female valve body along the wall thickness direction of the female valve body, each oblique groove having a locking pin disposed therein, the central portion of the locking pin being located within the female valve body, an unlocking ring disposed thereon, an annular cavity being defined between the unlocking ring and the female valve body, the annular cavity being connected to the oblique grooves, and a tightening ring disposed therein, connected to the unlocking ring. A tightening spring is connected to the end of the tightening ring remote from the locking pin, and both ends of the locking pin extend into the annular cavity and abut against the end surface of the tightening ring. The male connector includes a male valve body with a second flow channel, the male valve body having an annular retaining plate configured to engage with the locking pin for locking, the annular retaining plate having a first inclined surface configured to act on the central portion of the locking pin.

[0004] Based on this, in order to further improve the plug-in reliability of the UQD quick connector, the applicant has developed a new technical solution. Utility Model Content

[0005] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a quick connector and a female end connection assembly. By improving the structure of the female end connection assembly, especially the three-section outer surface, three-section inner surface and related structural design of the annular movable plug, the guiding and positioning effects are good during the plugging and unplugging action and after plugging, and it is not easy to loosen or leak, thereby effectively improving the mutual plug-in reliability of the female end connection assembly and the male end connection assembly and enhancing the product competitiveness.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A quick connector includes a female end connection component and a male end connection component that are pluggable and conductive;

[0008] The female end connection assembly includes a female end joint, an inner fixed sleeve, an outer movable sleeve, a fixed core rod, an annular movable plug, a steel ball, a first spring and a second spring; the inner fixed sleeve extends into the interior of one end of the female end joint, and the inner wall of the inner fixed sleeve is provided with an annular boss to divide the inner hole of the inner fixed sleeve into a first inner hole section and a second inner hole section located at both ends of the annular boss; the inner fixed sleeve is provided with a steel ball groove that passes through the inner and outer wall surfaces of the inner fixed sleeve, and the steel ball is located in the steel ball groove; the outer movable sleeve is arranged on the outer periphery of the inner fixed sleeve, and the first spring provides a reset elastic force for axial displacement of the outer movable sleeve; the fixed core rod and the annular movable plug are both located in the inner fixed sleeve, and the annular movable plug is arranged on the outer periphery of the fixed core rod and can slide axially, and the outer surface of the annular movable plug is designed to be arranged in sequence along the axial direction of the plug interface with the first section outer surface, the second section outer surface and the second section outer surface. The outer surface and the outer surface of the third section, a fixing ring is sleeved on the outer surface of the first section, the outer circumference of the fixing ring exceeds the outside of the second section outer surface to form an anti-slip portion, the anti-slip portion is limited by one end of the annular boss, the second spring acts on the fixing ring to provide a restoring elastic force for axial displacement of the annular movable plug, and a first limiting step is connected between the outer surface of the second section and the outer surface of the third section, and the first limiting step is limited by the other end of the annular boss; the inner surface of the annular movable plug is designed to be a first section inner surface, a second section inner surface and a third section inner surface arranged in sequence along the axial direction toward the plug-in interface, the inner surface of the first section and the fixed core rod can be in relative axial sliding sealing contact, the inner surface of the second section and the inner surface of the first section are connected with a second limiting step, and the inner surface of the third section is a bell-mouth surface designed to gradually increase toward the plug-in interface;

[0009] The male end connection assembly includes a male end connector, a male end socket, a male end movable plug and a third spring. The male end socket is inserted into one end of the male end connector and the internal parts are mutually connected. The male end movable plug is arranged inside one end of the male end socket and can be in relative axial sliding sealing contact. The third spring provides the male end movable plug with a restoring elastic force for axial displacement; the outer periphery of the male end socket is provided with a locking inclined surface or a locking arc surface for the steel ball to extend into.

[0010] As a preferred solution, a second sealing ring is provided between the outer periphery of the annular movable plug and the inner wall surface of the inner fixed sleeve.

[0011] As a preferred solution, a second annular groove is concavely formed on the outer circumferential surface of the fixed core rod, and a third sealing ring is arranged in the second annular groove, so that the inner surface of the first section is in sealing contact with the fixed core rod.

[0012] As a preferred solution, the outer surface of the first section is provided with an introduction portion and a nesting groove, and the fixing ring is inserted into the nesting groove from the axial inner end of the annular movable plug.

[0013] As a preferred solution, a third annular groove is formed on the inner surface of the second section, and a fourth sealing ring is provided in the third annular groove.

[0014] As a preferred solution, the fourth sealing ring is arranged close to the inner surface of the third section and away from the inner surface of the first section.

[0015] As a preferred solution, a fourth annular groove is concavely provided on the outer circumferential surface of the male end movable plug, and a fifth sealing ring is provided in the fourth annular groove, so that the male end movable plug is in sealing contact with the male end sleeve.

[0016] As a preferred embodiment, an annular frustum is provided on the outer periphery of the male end socket, and the side of the annular frustum facing the plug-in end of the male end socket has a conical inclined surface, and the conical inclined surface is matched and positioned with the inner surface of the third section, and the locking inclined surface or locking arc surface is provided on the other side of the annular frustum away from the plug-in end of the male end socket.

[0017] As a preferred solution, the inner wall surface of the outer movable sleeve is provided with a steel ball stop groove. When not plugged in, the steel ball is partially located in the steel ball stop groove and is restricted by the inner left end surface of the steel ball stop groove; the outer periphery of the inner fixed sleeve is provided with a retaining spring; the outer movable sleeve can be circumferentially rotatable relative to the female end connector and the inner fixed sleeve.

[0018] A female end connection assembly includes a female end connector, an inner fixed sleeve, an outer movable sleeve, a fixed core rod, an annular movable plug, a steel ball, a first spring, and a second spring;

[0019] The inner fixing sleeve extends into one end of the female connector, and the inner wall of the inner fixing sleeve is provided with an annular boss to divide the inner hole of the inner fixing sleeve into a first inner hole section and a second inner hole section located at both ends of the annular boss; the inner fixing sleeve is provided with a steel ball groove that runs through the inner and outer wall surfaces of the inner fixing sleeve, and the steel ball is located in the steel ball groove; the outer movable sleeve is sleeved on the outer periphery of the inner fixing sleeve, and the first spring provides a reset elastic force for the axial displacement of the outer movable sleeve; the fixed core rod and the annular movable plug are both located in the inner fixing sleeve, and the annular movable plug is sleeved on the outer periphery of the fixed core rod and can slide axially, and the outer surface of the annular movable plug is designed to be a first section outer surface, a second section outer surface and a third section outer surface arranged in sequence along the axial direction toward the plug-in interface, and the first section outer surface is sleeved with a fixed The fixed ring, the outer periphery of the fixed ring exceeds the outside of the second section outer surface to form an anti-slip portion, the anti-slip portion is limited by one end of the annular boss, the second spring acts on the fixed ring to provide a reset elastic force for axial displacement of the annular movable plug, and a first limiting step is connected between the second section outer surface and the third section outer surface, and the first limiting step is limited by the other end of the annular boss; the inner surface of the annular movable plug is designed to be a first section inner surface, a second section inner surface and a third section inner surface arranged in sequence along the axial direction toward the plug interface, the first section inner surface and the fixed core rod can be in relative axial sliding sealing contact, the second section inner surface and the first section inner surface are connected with a second limiting step, and the third section inner surface is a bell-mouth surface designed to gradually increase toward the plug interface.

[0020] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly improves the structure of the female end connection component, especially the three-section outer surface, three-section inner surface and related structural design of the annular movable plug, so that the plugging and unplugging action and after plugging are good in guiding and positioning effects, and it is not easy to loosen or leak, which effectively improves the mutual plug-in reliability of the female end connection component and the male end connection component and enhances the product competitiveness.

[0021] In order to more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is an exploded view (in a three-dimensional state) of the female end connection component and the male end connection component of the quick connector according to an embodiment of the present utility model;

[0023] Figure 2 This is a diagram illustrating the connection between the female end connection component and the male end connection component of the quick connector according to an embodiment of the present utility model;

[0024] Figure 3This is an exploded view (cross-section) of the female end connection assembly and the male end connection assembly of the quick connector according to an embodiment of the present utility model;

[0025] Figure 4 It is a cross-sectional view of the female end connection assembly of the quick connector according to an embodiment of the present utility model;

[0026] Figure 5 It is a cross-sectional view of the male end connection assembly of the quick connector according to an embodiment of the present utility model;

[0027] Figure 6 This is a diagram (cross-section) of the female end connection component and the male end connection component of the quick connector according to an embodiment of the present utility model being plugged in;

[0028] Figure 7 This is an exploded view (in three-dimensional form) of the female end connection assembly of the quick connector according to an embodiment of the present invention;

[0029] Figure 8 This is an exploded view (cross-section) of the female end connection assembly of the quick connector according to an embodiment of the present invention;

[0030] Figure 9 This is an exploded view (cross-section) of the annular movable plug and the fixing ring of an embodiment of the present utility model;

[0031] Figure 10 This is a product diagram after the Universal Quick Disconnect (UQD) specification revision 1.0 standardized the shape of UQD quick connectors. DETAILED DESCRIPTION

[0032] Please refer to Figures 1 to 9 As shown, it shows the specific structure of an embodiment of the present utility model.

[0033] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0034] A quick connector includes a female end connection component 100 and a male end connection component 200 that are pluggable and conductive.

[0035] The female end connection assembly 100 includes a female end connector 101, an inner fixed sleeve 102, an outer movable sleeve 103, a fixed core rod 104, an annular movable plug 105, a steel ball 106, a first spring 107 and a second spring 108; the interior of the female end connector 101 has a first accommodating cavity 121 that passes through both ends, the fixed core rod 104 is arranged inside the female end connector 101, the fixed core rod 104 has a head end sealing portion, an internal connecting cavity and a lateral through hole, the inner end of the internal connecting cavity is connected to the inner end of the first accommodating cavity 121, the lateral through hole is located on the inner side of the head end sealing portion and is connected between the internal connecting cavity and the first accommodating cavity 121; a first sealing ring 114 is provided between the inner fixed sleeve 102 and the inner wall surface of the female end connector 101. The inner fixing sleeve 102 extends into one end of the female end connector 101, and the inner wall of the inner fixing sleeve 102 is provided with an annular boss A to divide the inner hole of the inner fixing sleeve 102 into a first inner hole section B1 and a second inner hole section B2 located at both ends of the annular boss A; the inner fixing sleeve 102 is provided with a steel ball groove 117 that passes through the inner and outer wall surfaces of the inner fixing sleeve 102, and the steel ball 106 is located in the steel ball groove 117; the outer movable sleeve 103 is sleeved on the outer periphery of the inner fixing sleeve 102, and the outer movable sleeve 103 is sleeved on the outer periphery of the inner fixing sleeve 102. The first spring 107 provides the outer movable sleeve 103 with a restoring elastic force for axial displacement; in this embodiment, the inner wall surface of the outer movable sleeve 103 is provided with a steel ball stop groove 122. When not plugged in, the steel ball 106 is partially located in the steel ball stop groove 122 and is restricted by the inner left end surface of the steel ball stop groove 122; the outer periphery of the inner fixed sleeve 102 is provided with a circular retaining spring 118; the outer movable sleeve 103 can be circumferentially rotated relative to the female end connector 101 and the inner fixed sleeve 102. The fixed core rod 104 and the annular movable plug 105 are both located in the inner fixed sleeve 102. The annular movable plug 105 is sleeved on the outer periphery of the fixed core rod 104 and can slide axially. The outer surface of the annular movable plug 105 is designed to be a first section outer surface 1, a second section outer surface 2 and a third section outer surface 3 arranged in sequence along the axial direction toward the plug-in port. A fixing ring C is sleeved on the first section outer surface 1. Specifically, the first section outer surface 1 has an introduction portion and a nesting groove. The fixing ring C is inserted into the nesting groove from the axial inner end of the annular movable plug 105. The two ends of the fixing ring C are restricted by the introduction portion and one end of the annular boss A.The outer diameter of the fixed ring C is larger than the outer diameter of the second section outer surface 2, and the outer circumference of the fixed ring C exceeds the outside of the second section outer surface 2 to form an anti-slip portion D, and the anti-slip portion D is limited by one end of the annular boss A. The second spring 108 acts on the fixed ring C to provide the annular movable plug 105 with a restoring elastic force for axial displacement. A first limiting step E is connected between the second section outer surface 2 and the third section outer surface 3, and the first limiting step E is limited by the other end of the annular boss A; the inner surface of the annular movable plug 105 is designed to be a first section inner surface 1', a second section inner surface 2' and a third section inner surface 3' arranged in sequence along the axial direction toward the plug-in interface, the first section inner surface 1' and the fixed core rod 104 can be in relative axial sliding sealing contact, a second limiting step F is connected between the second section inner surface 2' and the first section inner surface 1', and the third section inner surface 3' is a circular bell-mouth surface designed to gradually increase in size toward the plug-in interface; a second sealing ring 115 is sealed between the outer circumference of the annular movable plug 105 and the inner wall surface of the inner fixed sleeve 102. The inner surface of the annular boss A is recessed with a first annular groove, within which the second sealing ring 115 is located. The outer circumferential surface of the fixed mandrel 104 is recessed with a second annular groove, within which a third sealing ring 116 is located, ensuring sealing contact between the first section inner surface 1' and the fixed mandrel 104. A third annular groove is recessed with the second section inner surface 2', within which a fourth sealing ring G is located. The fourth sealing ring G is positioned proximate to the third section inner surface 3' and away from the first section inner surface 1'.

[0036] The male connection assembly 200 includes a male connector 201, a male sleeve 202, a male movable plug 203, and a third spring 204. The male sleeve 202 is inserted into one end of the male connector 201 and is internally interconnected. The male movable plug 203 is disposed within one end of the male sleeve 202 and can slide relative to it in an axially sealed manner. The third spring 204 provides a restoring force for the male movable plug 203 to maintain axial displacement. The outer periphery of the male sleeve 202 is provided with a locking bevel or locking arc 205 for the steel ball to extend into. The outer periphery of the male movable plug 203 is concavely provided with a fourth annular groove, within which a fifth sealing ring 206 is disposed, ensuring a sealed contact between the male movable plug 203 and the male sleeve 202. An annular frustum H is provided on the outer periphery of the male end socket 202. The side of the annular frustum H facing the plug-in end of the male end socket 202 has a conical inclined surface H1. The conical inclined surface H1 is matched and positioned with the inner surface 3' of the third section. The locking inclined surface or locking arc surface 205 is provided on the other side of the annular frustum H away from the plug-in end of the male end socket 202.

[0037] When the male end connecting assembly 200 is inserted into the female end connecting assembly 100, the male end sleeve 202 is inserted along the inner surface 3' of the third section and abuts against the second limiting step F, so that the annular movable plug 105 continues to move axially inward, and the sealing contact between the first section inner surface 1' and the fixed core rod 104 is released, and the second spring 108 is in a compressed state until the first limiting step E is restricted by the other end of the annular boss A, and the male end movable plug 203 abuts against the fixed core rod 104, the position of the fixed core rod 104 remains unchanged, the male end movable plug 203 is pressed and displaced axially inward, and the third spring 204 is in a compressed state.

[0038] The design focus of the present invention is that it is mainly improved by improving the structure of the female end connection component, especially the three-section outer surface, three-section inner surface and related structural design of the annular movable plug, namely: the outer surface of the annular movable plug is designed to be a first section outer surface, a second section outer surface and a third section outer surface arranged in sequence along the axial direction toward the plug interface, a fixing ring is sleeved on the first section outer surface, the outer periphery of the fixing ring exceeds the outside of the second section outer surface to form an anti-slip portion, the anti-slip portion is limited by one end of the annular boss, the second spring acts on the fixing ring to provide a reset elastic force for axial displacement of the annular movable plug, a first limiting step is connected between the second section outer surface and the third section outer surface, and the first limiting step is limited to the other end of the annular boss; the inner surface of the annular movable plug is designed to be a first section inner surface, a second section inner surface and a third section inner surface arranged in sequence along the axial direction toward the plug interface, The first section inner surface and the fixed core rod can be in relative axial sliding sealing contact, and a second limiting step is connected between the inner surface of the second section and the inner surface of the first section, and the inner surface of the third section is a bell-shaped surface designed to gradually increase toward the plug-in interface; so that when the male end connection component is inserted into the female end connection component, the male end sleeve is inserted along the inner surface of the third section and abuts against the second limiting step, so that the annular movable plug continues to move axially inward, and the sealing contact between the inner surface of the first section and the fixed core rod is released, and the second spring is in a compressed state until the first limiting step is restricted by the other end of the annular boss, and the male end movable plug abuts against the fixed core rod, the position of the fixed core rod remains unchanged, the male end movable plug is pressed and displaced axially inward, and the third spring is in a compressed state. The plug-in and pull-out action and after plug-in are good in guiding and positioning, and loosening and leakage are not easy to occur, which effectively improves the mutual plug-in reliability of the female end connection component and the male end connection component and enhances product competitiveness.

[0039] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A quick connector comprising a pluggable female connection assembly (100) and a male connection assembly (200); characterized in that: The female end connection assembly (100) comprises a female end connector (101), an inner fixed sleeve (102), an outer movable sleeve (103), a fixed core rod (104), an annular movable plug (105), a steel ball (106), a first spring (107) and a second spring (108); the inner fixed sleeve (102) extends into one end of the female end connector (101), and an annular boss (A) is provided on the inner wall of the inner fixed sleeve (102) to separate the inner hole of the inner fixed sleeve (102) into a first inner hole section (B1) and a second inner hole section (B2) located at both ends of the annular boss (A); the inner fixed sleeve (102) extends into the inner wall of the female end connector (101), and the inner hole of the inner fixed sleeve (102) is divided into a first inner hole section (B1) and a second inner hole section (B2) located at both ends of the annular boss (A); The sleeve (102) is provided with a steel ball groove (117) which passes through the inner and outer wall surfaces of the inner fixed sleeve (102), and the steel ball (106) is located in the steel ball groove (117); the outer movable sleeve (103) is sleeved on the outer periphery of the inner fixed sleeve (102), and the first spring (107) provides the outer movable sleeve (103) with a reset elastic force for axial displacement; the fixed core rod (104) and the annular movable plug (105) are both located in the inner fixed sleeve (102), and the annular movable plug (105) is sleeved on the outer periphery of the fixed core rod (104) and can slide axially, and the outer periphery of the annular movable plug (105) The surface is designed to be arranged in sequence along the axial direction toward the plug interface, with a first section outer surface (1), a second section outer surface (2) and a third section outer surface (3), a fixed ring (C) is sleeved on the first section outer surface (1), the outer periphery of the fixed ring (C) exceeds the outside of the second section outer surface (2) to form an anti-slip portion (D), the anti-slip portion (D) is limited by one end of the annular boss (A), the second spring (108) acts on the fixed ring (C) to provide an axial displacement reset elastic force to the annular movable plug (105), the second section outer surface (2) and the third section outer surface (3) are connected by a first limiting spring. The first limiting step (E) is limited by the other end of the annular boss (A); the inner surface of the annular movable plug (105) is designed to be a first section inner surface (1'), a second section inner surface (2') and a third section inner surface (3') arranged in sequence along the axial direction toward the plug-in interface, the first section inner surface (1') and the fixed core rod (104) can be in relative axial sliding sealing contact, a second limiting step (F) is connected between the second section inner surface (2') and the first section inner surface (1'), and the third section inner surface (3') is a bell-mouth surface designed to be gradually larger toward the plug-in interface; The male end connection assembly (200) includes a male end connector (201), a male end plug sleeve (202), a male end movable plug (203) and a third spring (204); the male end plug sleeve (202) is inserted into one end of the male end connector (201) and the interiors thereof are mutually connected; the male end movable plug (203) is arranged inside one end of the male end plug sleeve (202) and can be in relative axial sliding sealing contact; the third spring (204) provides the male end movable plug (203) with a restoring elastic force for axial displacement; and the outer periphery of the male end plug sleeve (202) is provided with a locking inclined surface or a locking arc surface (205) for a steel ball to extend into.

2. A quick connector according to claim 1, characterized in that: A second sealing ring (115) is provided between the outer periphery of the annular movable plug (105) and the inner wall surface of the inner fixed sleeve (102) for sealing.

3. A quick connector according to claim 1, characterized in that: A second annular groove is concavely provided on the outer peripheral surface of the fixed core rod (104), and a third sealing ring (116) is provided in the second annular groove, so that the first section inner surface (1') is in sealing contact with the fixed core rod (104).

4. A quick connector according to claim 1, characterized in that: The first section outer surface (1) has an introduction portion and a nesting groove, and the fixing ring (C) is inserted into the nesting groove from the axial inner end of the annular movable plug (105).

5. The quick connector according to claim 1, characterized in that: A third annular groove is formed on the inner surface (2') of the second section, and a fourth sealing ring (G) is provided in the third annular groove.

6. A quick connector according to claim 5, characterized in that: The fourth sealing ring (G) is arranged close to the inner surface (3') of the third section and away from the inner surface (1') of the first section.

7. The quick connector according to claim 1, characterized in that: A fourth annular groove is concavely provided on the outer circumferential surface of the male end movable plug (203), and a fifth sealing ring (206) is provided in the fourth annular groove, so that the male end movable plug (203) is in sealing contact with the male end socket (202).

8. The quick connector according to claim 1, characterized in that: An annular cone (H) is provided on the outer periphery of the male end socket (202), and a conical inclined surface (H1) is provided on the side of the annular cone (H) facing the plug-in end of the male end socket (202), and the conical inclined surface (H1) is matched and positioned with the inner surface (3') of the third section, and the locking inclined surface or locking arc surface (205) is provided on the other side of the annular cone (H) away from the plug-in end of the male end socket (202).

9. The quick connector according to claim 1, characterized in that: The inner wall surface of the outer movable sleeve (103) is provided with a steel ball stop groove (122). When not plugged in, the steel ball (106) is partially located in the steel ball stop groove (122) and is restricted by the inner left end surface of the steel ball stop groove (122). The outer periphery of the inner fixed sleeve (102) is provided with a retaining spring (118). The outer movable sleeve (103) can be circumferentially rotated relative to the female end connector (101) and the inner fixed sleeve (102).

10. A female end connection assembly, characterized in that: It includes a female end connector (101), an inner fixed sleeve (102), an outer movable sleeve (103), a fixed core rod (104), an annular movable plug (105), a steel ball (106), a first spring (107) and a second spring (108); The inner fixed sleeve (102) extends into one end of the female end connector (101), and the inner wall of the inner fixed sleeve (102) is provided with an annular boss (A) to separate the inner hole of the inner fixed sleeve (102) into a first inner hole section (B1) and a second inner hole section (B2) located at both ends of the annular boss (A); the inner fixed sleeve (102) is provided with a steel ball groove (117) that passes through the inner and outer wall surfaces of the inner fixed sleeve (102), and the steel ball (106) is located in the steel ball groove (117); the outer movable sleeve (103) is sleeved on The outer periphery of the inner fixed sleeve (102), the first spring (107) provides the outer movable sleeve (103) with a restoring elastic force for axial displacement; the fixed core rod (104) and the annular movable plug (105) are both located in the inner fixed sleeve (102), the annular movable plug (105) is sleeved on the outer periphery of the fixed core rod (104) and can slide axially, and the outer surface of the annular movable plug (105) is designed to be a first section outer surface (1), a second section outer surface (2) and a third section outer surface (3) arranged in sequence along the axial direction toward the plug interface The first section outer surface (1) is provided with a fixed ring (C), the outer periphery of the fixed ring (C) exceeds the outer periphery of the second section outer surface (2) to form an anti-slip portion (D), the anti-slip portion (D) is limited by one end of the annular boss (A), the second spring (108) acts on the fixed ring (C) to provide an axial displacement reset elastic force to the annular movable plug (105), the second section outer surface (2) and the third section outer surface (3) are connected by a first limiting step (E), the first limiting step (E) is limited by the annular boss (A). The other end of the boss (A); the inner surface of the annular movable plug (105) is designed to be a first section inner surface (1'), a second section inner surface (2') and a third section inner surface (3') arranged in sequence along the axial direction toward the plug-in interface, the first section inner surface (1') and the fixed core rod (104) can be in relative axial sliding sealing contact, a second limiting step (F) is connected between the second section inner surface (2') and the first section inner surface (1'), and the third section inner surface (3') is a bell-mouth surface designed to gradually increase in size toward the plug-in interface.

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