Floating blind plug and fast connector device

CN224836637UActive Publication Date: 2026-10-09NEXTRONICS ENGINEERING(GUANGDONG) CORP +1
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Patent Information

Application Number
CN202522231841.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-10-21
Publication Date
2026-10-09
Estimated Expiration
2035-10-21

AI Technical Summary

Technical Problem

然而现有的快速水接头,母端快接头及公端快接头在相互接合时,容易有插拔不顺畅的问题

Benefits of technology

[0016]综上所述,本发明的有益效果在于,本发明所提供的浮动盲插快接头装置,包括一母端快接头及一公端快接头,母端快接头包含一母端外壳、一固定阀芯、一第一弹性件及一活动阀芯,固定阀芯及活动阀芯设置于母端外壳内,活动阀芯套设于固定阀芯外,第一弹性件能顶推活动阀芯向前移动,使活动阀芯能弹性封闭母端外壳的内部。公端快接头包含一公端外壳、一固定环、一尾盖、一第二弹性件及一公端阀芯,公端外壳具有一插接部及一环部,环部设于插接部的后端,固定环套设于插接部外,尾盖套设于固定环外,且尾盖设置于环部外,公端外壳与固定环及尾盖之间形成一浮动空间,使公端外壳能相对于固定环及尾盖浮动移动,公端阀芯及第二弹性件设置于公端外壳内,第二弹性件能顶推公端阀芯向前移动,使公端阀芯能弹性封闭公端外壳的内部,公端外壳的环部及尾盖之间设有多个滑动件。母端快接头及公端快接头相互插接时,固定阀芯及公端阀芯能相互顶推,且公端外壳与活动阀芯能相互顶推,使母端快接头及公端快接头形成开放状态,使冷却液可在母端快接头及公端快接头内流动,以便于输送冷却液。本发明的公端快接头能利用浮动空间提供浮动(圆周浮动)功能,且公端外壳的环部及尾盖之间设有多个滑动件,可提供浮动滑行功能,使接头浮动更顺畅,而使母端快接头及公端快接头可以顺利的插拔。

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Abstract

A floating blind-mate quick connector device includes a female quick connector and a male quick connector. The female quick connector includes a female housing, a fixed valve core, a first elastic member and a movable valve core, the fixed valve core and the movable valve core are arranged in the female housing, and the first elastic member can push the movable valve core to move forward. The male quick connector includes a male housing, a fixed ring, a tail cover, a second elastic member and a male valve core, the male housing forms a floating space with the fixed ring and the tail cover, the second elastic member can push the male valve core to move forward, and a plurality of sliding members are arranged between the ring part of the male housing and the tail cover. When the female quick connector and the male quick connector are inserted into each other, the fixed valve core and the male valve core can push each other, and the male housing and the movable valve core can push each other, so that an open state is formed. The male quick connector can provide a floating function, and the plurality of sliding members can provide a floating sliding function, so that the female quick connector and the male quick connector can be smoothly inserted and pulled out.
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Description

Technical Field

[0001] This invention relates to a floating blind-plug quick-connect device, and more particularly to a water connector device that enables the female quick-connect and male quick-connect to quickly engage for conveying coolant. Background Technology

[0002] Quick-connect water couplings include female and male quick-connect fittings, which can be plugged into each other for quick engagement and are used to deliver coolant, thereby assisting in the heat dissipation of heat source devices. However, existing quick-connect water couplings, particularly the female and male quick-connect fittings, are prone to problems with smooth insertion and removal when they are connected. Utility Model Content

[0003] The technical problem to be solved by the present invention is to provide a floating blind-plug quick connector device to address the shortcomings of the prior art. The female quick connector can utilize the floating space to provide a floating function, so that the female quick connector and the male quick connector can be smoothly plugged in and out.

[0004] One embodiment of the present invention discloses a floating blind-plug quick-connect device, including a female quick-connect connector, the female quick-connect connector comprising a female end shell, a fixed valve core, a first elastic element, and a movable valve core, the fixed valve core and the movable valve core being disposed within the female end shell, the movable valve core being sleeved outside the fixed valve core, the first elastic element being able to push the movable valve core forward, so that the movable valve core can elastically close the interior of the female end shell; and a male quick-connect connector, the male quick-connect connector comprising a male end shell, a fixed ring, a tail cap, a second elastic element, and a male end valve core, the male end shell having a plug-in portion and a ring portion, the ring portion being disposed at the rear end of the plug-in portion, the fixed ring being sleeved outside the plug-in portion, and the tail cap being sleeved outside the plug-in portion. Outside the fixed ring, the tail cap is disposed outside the ring portion. A floating space is formed between the male end shell, the fixed ring, and the tail cap, allowing the male end shell to float and move relative to the fixed ring and the tail cap. The male end valve core and the second elastic element are disposed inside the male end shell. The second elastic element can push the male end valve core forward, allowing the male end valve core to elastically close the interior of the male end shell. Multiple sliding elements are provided between the ring portion and the tail cap of the male end shell. When the female end quick connector and the male end quick connector are inserted into each other, the fixed valve core and the male end valve core can push against each other, and the male end shell and the movable valve core can push against each other, causing the female end quick connector and the male end quick connector to form an open state.

[0005] Optionally, a first C-shaped ring is provided on the inner side of the female end housing. The first C-shaped ring is snapped onto the inner side of the female end housing to limit the fixed valve core. The fixed valve core has a rod body and a fixed seat. The fixed seat is hollow and connected to the rear end of the rod body. The rear end of the fixed seat abuts against the first C-shaped ring. The first elastic element is disposed between the fixed seat of the fixed valve core and the movable valve core. The fixed seat of the fixed valve core is provided with a positioning groove. The rear end of the first elastic element is accommodated in the positioning groove for positioning the first elastic element.

[0006] Optionally, the movable valve core has a first ring and a second ring connected to each other. The outer diameter of the first ring is smaller than the outer diameter of the second ring. The front end of the first elastic member abuts against the rear end of the first ring. A first contact surface is formed between the first ring and the second ring. A second contact surface is provided on the inner side of the female end housing. The second contact surface can be used to block and limit the first contact surface.

[0007] Optionally, two first sealing rings are provided on the inner side of the female end shell near the front end, and the two first sealing rings are spaced apart. When the female end quick connector and the male end quick connector are engaged with each other, the two first sealing rings are located between the female end shell and the male end shell.

[0008] Optionally, the floating space has a floating distance of 0.5 to 1.5 mm.

[0009] Optionally, the floating space is located outside the plug and the ring, such that the floating space is located between the plug and the fixed ring, and between the ring and the tail cap.

[0010] Optionally, the front end of the fixing ring has a positioning part, which abuts against the front end of the tail cap for positioning, and the rear end of the fixing ring has a limiting part, which is located on one side of the ring part. The limiting part can stop and limit the ring part so that there is no axial displacement between the male end shell and the tail cap.

[0011] Optionally, a second C-ring is provided on the inner side of the male end housing. The second C-ring is snapped onto the inner side of the male end housing, and the rear end of the second elastic member abuts against the second C-ring to stop and limit the second elastic member.

[0012] Optionally, the plurality of sliding members are ball bearings, and a plurality of receiving grooves are provided on the inner side of the tail cover. The plurality of sliding members are respectively received in the plurality of receiving grooves, and the plurality of sliding members can slide to contact the ring portion of the male end shell.

[0013] Optionally, the plurality of sliding members are protruding spheres, the plurality of sliding members are formed on the inner side of the tail cap, and the plurality of sliding members can slide in contact with the ring portion of the male end housing.

[0014] Optionally, a second sealing ring is provided between the ring portion and the fixing ring of the male end shell, and a third sealing ring is provided between the fixing ring and the tail cap.

[0015] Optionally, the front end of the plug portion of the male end housing is provided with a chamfer, and the front end of the female end housing is provided with a tapered hole.

[0016] In summary, the beneficial effects of the present invention are that the floating blind-plug quick connector device provided by the present invention includes a female quick connector and a male quick connector. The female quick connector includes a female housing, a fixed valve core, a first elastic element and a movable valve core. The fixed valve core and the movable valve core are disposed inside the female housing, and the movable valve core is sleeved outside the fixed valve core. The first elastic element can push the movable valve core forward, so that the movable valve core can elastically seal the interior of the female housing. The male quick-connect coupling includes a male housing, a retaining ring, a tail cap, a second elastic element, and a male valve core. The male housing has a plug-in portion and a ring portion. The ring portion is located at the rear end of the plug-in portion, the retaining ring is sleeved outside the plug-in portion, and the tail cap is sleeved outside the retaining ring and located outside the ring portion. A floating space is formed between the male housing, the retaining ring, and the tail cap, allowing the male housing to float and move relative to the retaining ring and the tail cap. The male valve core and the second elastic element are located inside the male housing. The second elastic element can push the male valve core forward, allowing the male valve core to elastically close the interior of the male housing. Multiple sliding elements are provided between the ring portion and the tail cap of the male housing. When the female quick-connect coupling and the male quick-connect coupling are plugged into each other, the retaining valve core and the male valve core can push against each other, and the male housing and the movable valve core can push against each other, making the female quick-connect coupling and the male quick-connect coupling open, allowing coolant to flow within the female quick-connect coupling and the male quick-connect coupling for coolant delivery. The male quick connector of the present invention can provide a floating (circumferential floating) function by utilizing the floating space, and multiple sliding parts are provided between the ring part of the male end shell and the tail cap to provide a floating sliding function, making the connector float more smoothly, and allowing the female quick connector and the male quick connector to be inserted and removed smoothly.

[0017] To further understand the features and technical content of the present invention, please refer to the following detailed description and accompanying drawings. However, the drawings are provided for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0018] Figure 1 This is a perspective view of the floating blind-plug quick connector device according to an embodiment of the present invention.

[0019] Figure 2 for Figure 1Sectional view II-II.

[0020] Figure 3 This is a perspective view of the female quick connector according to an embodiment of the present invention.

[0021] Figure 4 for Figure 3 Sectional view of section IV-IV.

[0022] Figure 5 This is an exploded perspective view of the female quick connector according to an embodiment of the present invention.

[0023] Figure 6 This is a perspective view of the male quick connector according to an embodiment of the present invention.

[0024] Figure 7 for Figure 6 Sectional view of VII-VII.

[0025] Figure 8 This is an exploded perspective view of the male quick connector according to an embodiment of the present invention.

[0026] Figure 9 This is a cross-sectional view of a male quick connector according to another embodiment of the present invention. Detailed Implementation

[0027] [Example]

[0028] Please see Figure 1 and Figure 2 This invention provides a floating blind-plug quick connector device, including a female quick connector 100 and a male quick connector 200, which can be quickly connected by plugging into each other. For ease of understanding, in this invention, the end facing the insertion direction of the female quick connector 100 and the male quick connector 200 is called the "front end", and the end facing the removal direction of the female quick connector 100 and the male quick connector 200 is called the "rear end".

[0029] Please see Figures 3 to 5 The female quick connector 100 includes a female housing 1, a fixed valve core 2, a first elastic element 3, and a movable valve core 4. The female housing 1 may be a circular hollow body, allowing a channel to be formed inside for coolant flow. The fixed valve core 2 is disposed inside the female housing 1. The movable valve core 4 may be a circular hollow body, disposed inside the female housing 1, and sleeved outside the fixed valve core 2. The first elastic element 3 is disposed between the rear end of the fixed valve core 2 and the movable valve core 4, with the front end of the first elastic element 3 abutting against the movable valve core 4, allowing the movable valve core 4 to be elastically disposed inside the female housing 1. The first elastic element 3 can push the movable valve core 4 forward, allowing the movable valve core 4 to elastically close the interior of the female housing 1, so that the female quick connector 100 is in a closed state when not engaged with the male quick connector 200.

[0030] A first C-ring 13 may be provided on the inner side of the female end housing 1. The first C-ring 13 is snapped onto the inner side of the female end housing 1 to limit and fix the valve core 2. In this embodiment, the fixed valve core 2 has a rod body 21 and a fixing seat 22. The fixing seat 22 is hollow and is connected to the rear end of the rod body 21. The rear end of the fixing seat 22 abuts against the first C-ring 13, so that the fixed valve core 2 can be stably set in the female end housing 1. A first elastic member 3 is disposed between the fixing seat 22 of the fixed valve core 2 and the movable valve core 4. The fixing seat 22 of the fixed valve core 2 may also be provided with a positioning groove 221. The rear end of the first elastic member 3 can be accommodated in the positioning groove 221 to position the first elastic member 3, so as to avoid the first elastic member 3 and the fixed valve core 2 from being misaligned, so that the fixed valve core 2 and the first elastic member 3 have good positioning.

[0031] In this embodiment, the movable valve core 4 has a first ring 41 and a second ring 42 connected to each other. The outer diameter of the first ring 41 is smaller than the outer diameter of the second ring 42. The front end of the first elastic member 3 abuts against the rear end of the first ring 41. A first contact surface 43 is formed between the first ring 41 and the second ring 42. A second contact surface 11 is provided on the inner side of the female end housing 1. The second contact surface 11 can be used to stop and limit the first contact surface 43 to control the movement stroke of the movable valve core 4, so that the movable valve core 4 can move forward to a predetermined position.

[0032] In this embodiment, two first sealing rings 12 can be provided on the inner side of the female end housing 1 near the front end. The two first sealing rings 12 are spaced apart. When the female end quick connector 100 and the male end quick connector 200 are engaged with each other, the two first sealing rings 12 can be located between the female end housing 1 and the male end housing 5, which can provide a double-layer sealing function and enhance the leakage prevention function.

[0033] Please see Figures 6 to 8 The male quick connector 200 includes a male end housing 5, a retaining ring 6, a tail cap 7, a second elastic element 8, and a male end valve core 9. The male end housing 5 may be a circular hollow body, allowing a channel to be formed inside for coolant flow. The retaining ring 6 is fitted over the male end housing 5, and the tail cap 7 is fitted over the retaining ring 6. A floating space A is formed between the male end housing 5, the retaining ring 6, and the tail cap 7, allowing the male end housing 5 to move relative to the retaining ring 6 and the tail cap 7 in the radial direction of the male quick connector 200. In other words, the male end housing 5 can float relative to the retaining ring 6 and the tail cap 7, thus giving the male quick connector 200 a floating mechanism and providing a floating (circumferential floating) function for smooth engagement with the female quick connector 100. The floating space A may have a floating distance H, which can be 0.5~1.5mm, preferably 1mm, providing an optional floating effect.

[0034] In this embodiment, the male end housing 5 has a plug-in portion 51 and a ring portion 52. The plug-in portion 51 and the ring portion 52 may be cylindrical, and the ring portion 52 is located at the rear end of the plug-in portion 51. A fixing ring 6 is sleeved on the plug-in portion 51 of the male end housing 5, and a tail cap 7 is located on the outside of the fixing ring 6 and the ring portion 52. The floating space A may be located on the outside of the plug-in portion 51 and the ring portion 52, so that the floating space A may be located between the plug-in portion 51 and the fixing ring 6, and between the ring portion 52 and the tail cap 7, so that the male end quick connector 200 has a stable floating function.

[0035] In this embodiment, the front end of the fixing ring 6 has a positioning part 61, which abuts against the front end of the tail cover 7 for positioning. The rear end of the fixing ring 6 has a limiting part 62, which is located on one side of the ring part 52. The limiting part 62 can block and limit the male end shell 5 and the ring part 52, so that there will be no axial displacement between the male end shell 5 and the tail cover 7.

[0036] The male valve core 9 and the second elastic member 8 are disposed inside the male housing 5. In this embodiment, a second C-ring 10 may be disposed on the inner side of the male housing 5. The second C-ring 10 is snapped onto the inner side of the male housing 5. The rear end of the second elastic member 8 abuts against the second C-ring 10 to stop and limit the second elastic member 8. The front end of the second elastic member 8 abuts against the male valve core 9, so that the male valve core 9 is elastically disposed inside the male housing 5. The second elastic member 8 can push the male valve core 9 forward, so that the male valve core 9 can elastically close the interior of the male housing 5. This allows the male quick connector 200 to be in a closed state when not engaged with the female quick connector 100. When the female quick connector 100 and the male quick connector 200 are disassembled, the internal channel remains closed, which can automatically stop water flow and facilitate disassembly.

[0037] A plurality of sliding members 20 are provided between the annular portion 52 of the male end housing 5 and the tail cap 7. These sliding members 20 can be ball bearings or protruding spheres. In this embodiment, the sliding members 20 are ball bearings, and a plurality of receiving grooves 71 are provided on the inner side of the tail cap 7. The sliding members 20 are respectively housed in the receiving grooves 71, and lubricating oil can be added to the receiving grooves 71. The sliding members 20 partially expose the receiving grooves 71, allowing them to slide in contact with the annular portion 52 of the male end housing 5, thus providing a floating motion and making the male end housing 5 float more smoothly. Additionally, as... Figure 9 As shown, the plurality of sliding members 20 may also be protruding spheres. The plurality of sliding members 20 are formed on the inner side of the tail cap 7. The plurality of sliding members 20 can slide in contact with the ring portion 52 of the male end housing 5 so as to provide a floating sliding effect by utilizing the sliding members 20, making the joint float more smoothly.

[0038] In this embodiment, a second sealing ring 30 may be provided between the ring portion 52 of the male end housing 5 and the fixing ring 6 (e.g., Figure 7As shown), it can provide a positive pressure sealing function. A third sealing ring 40 can be provided between the retaining ring 6 and the tail cap 7 to provide a side pressure sealing function, so that the male end housing 5, the retaining ring 6 and the tail cap 7 can provide a preferred sealing performance. In this embodiment, the front end of the insertion part 51 of the male end housing 5 can be provided with a chamfer 53, and the front end of the female end housing 1 of the female end quick connector 100 can also be provided with a tapered hole 14 (as shown). Figure 2 As shown, the tapered hole 14 can be enlarged to facilitate the insertion of the male end housing 5.

[0039] When the female quick connector 100 and the male quick connector 200 are plugged into each other (e.g.) Figure 2 As shown, the fixed valve core 2 and the male valve core 9 can push against each other, and the male housing 5 and the movable valve core 4 can push against each other to open the internal channels of the female quick connector 100 and the male quick connector 200, so that the female quick connector 100 and the male quick connector 200 can be in an open state, allowing the coolant to flow in the female quick connector 100 and the male quick connector 200, so as to facilitate the delivery of coolant.

[0040] [Beneficial Effects of the Examples]

[0041] The beneficial effect of the present invention is that the floating blind-plug quick connector device provided by the present invention includes a female quick connector and a male quick connector. The female quick connector includes a female housing, a fixed valve core, a first elastic element and a movable valve core. The fixed valve core and the movable valve core are disposed inside the female housing, and the movable valve core is sleeved outside the fixed valve core. The first elastic element can push the movable valve core forward, so that the movable valve core can elastically seal the interior of the female housing. The male quick-connect coupling includes a male housing, a retaining ring, a tail cap, a second elastic element, and a male valve core. The male housing has a plug-in portion and a ring portion. The ring portion is located at the rear end of the plug-in portion, the retaining ring is sleeved outside the plug-in portion, and the tail cap is sleeved outside the retaining ring and located outside the ring portion. A floating space is formed between the male housing, the retaining ring, and the tail cap, allowing the male housing to float and move relative to the retaining ring and the tail cap. The male valve core and the second elastic element are located inside the male housing. The second elastic element can push the male valve core forward, allowing the male valve core to elastically close the interior of the male housing. Multiple sliding elements are provided between the ring portion and the tail cap of the male housing. When the female quick-connect coupling and the male quick-connect coupling are plugged into each other, the retaining valve core and the male valve core can push against each other, and the male housing and the movable valve core can push against each other, making the female quick-connect coupling and the male quick-connect coupling open, allowing coolant to flow within the female quick-connect coupling and the male quick-connect coupling for coolant delivery. The male quick connector of the present invention can provide a floating (circumferential floating) function by utilizing the floating space, and multiple sliding parts are provided between the ring part of the male end shell and the tail cap to provide a floating sliding function, making the connector float more smoothly, and allowing the female quick connector and the male quick connector to be inserted and removed smoothly.

[0042] However, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of patent protection of the present invention. Therefore, all equivalent changes made based on the description and drawings of the present invention are similarly included within the scope of protection of the present invention and are hereby stated.

Claims

1. A floating blind-mating quick-connect device, characterized in that, include: A female quick connector includes a female end housing, a fixed valve core, a first elastic element and a movable valve core. The fixed valve core and the movable valve core are disposed inside the female end housing, and the movable valve core is sleeved outside the fixed valve core. The first elastic element can push the movable valve core forward so that the movable valve core can elastically close the interior of the female end housing. as well as A male quick connector includes a male outer shell, a retaining ring, a tail cap, a second elastic element, and a male valve core. The male outer shell has a plug-in portion and a ring portion. The ring portion is located at the rear end of the plug-in portion. The retaining ring is sleeved outside the plug-in portion. The tail cap is sleeved outside the retaining ring and located outside the ring portion. A floating space is formed between the male outer shell, the retaining ring, and the tail cap, allowing the male outer shell to float and move relative to the retaining ring and the tail cap. The male valve core and the second elastic element are located inside the male outer shell. The second elastic element can push the male valve core forward, allowing the male valve core to elastically close the interior of the male outer shell. Multiple sliding elements are provided between the ring portion and the tail cap of the male outer shell. When the female quick connector and the male quick connector are plugged into each other, the fixed valve core and the male valve core can push against each other, and the male housing and the movable valve core can push against each other, so that the female quick connector and the male quick connector are in an open state.

2. The floating blind-plug quick-connect device as described in claim 1, characterized in that, A first C-shaped ring is provided on the inner side of the female end shell. The first C-shaped ring is snapped onto the inner side of the female end shell to limit the fixed valve core. The fixed valve core has a rod body and a fixed seat. The fixed seat is hollow and connected to the rear end of the rod body. The rear end of the fixed seat abuts against the first C-shaped ring. The first elastic element is disposed between the fixed seat of the fixed valve core and the movable valve core. The fixed seat of the fixed valve core is provided with a positioning groove. The rear end of the first elastic element is accommodated in the positioning groove for positioning the first elastic element.

3. The floating blind-plug quick-connect device as described in claim 1, characterized in that, The movable valve core has a first ring and a second ring connected to each other. The outer diameter of the first ring is smaller than the outer diameter of the second ring. The front end of the first elastic element abuts against the rear end of the first ring. A first contact surface is formed between the first ring and the second ring. A second contact surface is provided on the inner side of the female end shell. The second contact surface can be used to block and limit the first contact surface.

4. The floating blind-plug quick-connect device as described in claim 1, characterized in that, Two first sealing rings are provided on the inner side of the female end shell near the front end. The two first sealing rings are spaced apart. When the female end quick connector and the male end quick connector are engaged, the two first sealing rings are located between the female end shell and the male end shell.

5. The floating blind-plug quick-connect device as described in claim 1, characterized in that, The floating space has a floating distance of 0.5~1.5mm.

6. The floating blind-fit quick connector device as described in claim 1, characterized in that, The floating space is located outside the plug and the ring, such that the floating space is located between the plug and the fixed ring, and between the ring and the tail cap.

7. The floating blind-plug quick-connect device as described in claim 6, characterized in that, The front end of the fixing ring has a positioning part, which abuts against the front end of the tail cap for positioning. The rear end of the fixing ring has a limiting part, which is located on one side of the ring part. The limiting part can stop and limit the ring part, so that there is no axial displacement between the male end shell and the tail cap.

8. The floating blind-plug quick-connect device as described in claim 1, characterized in that, A second C-ring is provided on the inner side of the male end housing. The second C-ring is snapped onto the inner side of the male end housing. The rear end of the second elastic member abuts against the second C-ring to stop and limit the second elastic member.

9. The floating blind-fit quick-connect coupling device as described in claim 1, characterized in that, The plurality of sliding members are ball bearings, and a plurality of receiving grooves are provided on the inner side of the tail cap. The plurality of sliding members are respectively received in the plurality of receiving grooves, and the plurality of sliding members can slide to contact the ring portion of the male end shell.

10. The floating blind-fit quick connector device as described in claim 1, characterized in that, The plurality of sliding members are protruding spheres, and the plurality of sliding members are formed on the inner side of the tail cap. The plurality of sliding members can slide in contact with the ring portion of the male end shell.

11. The floating blind-plug quick-connect device as described in claim 1, characterized in that, A second sealing ring is provided between the ring portion and the fixing ring of the male end shell, and a third sealing ring is provided between the fixing ring and the tail cap.

12. The floating blind-plug quick-connect device as described in claim 1, characterized in that, The front end of the plug portion of the male end housing is provided with a chamfer, and the front end of the female end housing is provided with a tapered hole.