CN108799670A - Novel quick joint - Google Patents
Novel quick joint Download PDFInfo
- Publication number
- CN108799670A CN108799670A CN201810889612.9A CN201810889612A CN108799670A CN 108799670 A CN108799670 A CN 108799670A CN 201810889612 A CN201810889612 A CN 201810889612A CN 108799670 A CN108799670 A CN 108799670A
- Authority
- CN
- China
- Prior art keywords
- fixed ring
- tubular body
- ring
- quick joint
- novel quick
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L37/00—Couplings of the quick-acting type
- F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
- F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
- F16L37/091—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
- F16L47/08—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket
Abstract
A kind of Novel quick joint, including tubular body and at least one connector, the connector includes fixed ring and fastener, the fastener is plugged in the fixed ring, the fixed ring is located in one end of the tubular body, it is connect with the tubular body by snap-in structure, the snap-in structure is that predetermined distance is equipped at least two hook grooves on the side wall of the tubular body, it is equipped on the outer wall of the fixed ring identical with the groove number, and the lifting lug that shape is substantially identical, the lifting lug are hooked in the structure in the hook groove.When the present invention has connection extension tube attached, the Fluid pressure of extension tube attached is bigger, and the tubular body and the connector just engage tighter, both are not in the advantages of falling off.
Description
Technical field
The present invention relates to a kind of connector more particularly to a kind of Novel quick joints.
Background technology
By plastic pipe connect either by plastic pipe block tradition be using heat and soften plastic pipe be socketed again or
Plastic pipe is connected with the mode that glue bonds or blocks plastic pipe, but heats and softens plastic pipe to make ambient temperature
It increases, to cause construction personnel uncomfortable；Glue are waited to solidify completely by the way of glue bonding, so that taking over
Time is long, and efficiency is low.
People have invented a kind of quick union thus, including connect ontology and fixed cover soon, and the ontology that connects soon is equipped with hook
Slot, the fixed interior surface are equipped with lifting lug, and the fixed cover is hooked in the hook groove by lifting lug ecto-entad by the two
Connection.This structure has the effect quickly connected, but this quick connection exists when the Fluid pressure of fixed cover extension tube attached is excessive
When, it can lead to connect ontology and fixed cover deformation soon, so that fixed cover from connecing the hidden danger to fall off on ontology soon.
Invention content
In order to overcome the above problem, it is bigger that the present invention to society provides a kind of Fluid pressure of extension tube attached, tubular body and
The tighter Novel quick joint that connector is just locked.
The technical scheme is that：A kind of Novel quick joint, including tubular body and at least one connector are provided, it is described
Connector includes fixed ring and fastener, and the fastener is plugged in the fixed ring, and the fixed ring is located at the tubular body
In one end, it is connect with the tubular body by snap-in structure, the snap-in structure is the phase on the side wall of the tubular body
At least two hook grooves are equipped with every preset distance, and shape identical with the groove number is equipped on the outer wall of the fixed ring
Substantially identical lifting lug, the lifting lug are hooked in the hook groove.
Improvement for the present invention, the fixed ring includes first annular portion and the second ring part, second ring part
Inside flare, the small one end of the tubaeform internal diameter connects with the one end in the first annular portion, it is described it is tubaeform in
The internal diameter of the small one end of diameter is more than the internal diameter in first annular portion, forms ring-shaped step.
Improvement for the present invention, the internal diameter of the fixed ring outer end face are less than the internal diameter of inner face, and the fixed ring is in
It is tubaeform.
Improvement for the present invention, the fastener includes annular seating and claw, and the claw is along the annular seating endoporus
Periphery extend to one end and formed, hook tabs for blocking extension tube attached is equipped on the inner wall of the claw, in the card
The outer wall of pawl is equipped with annular protrusion, and the claw is axially arranged at least 1 gap, enable the claw to contract or
It is flared out.
Improvement for the present invention, at least 1 gap is 2-4 gap.
Improvement for the present invention, further includes positioning device, the positioning device is the axis in the tubular body inner wall
To equipped with to 1 locating slot, the substantially identical protrusion of shape is equipped on the outer wall of the fixed ring.
Improvement for the present invention, at least 1 locating slot is 2-4 locating slots being evenly arranged.
Improvement for the present invention is equipped with ring-shaped step in the tubular body, is equipped on the ring-shaped step close
Seal, the fixed ring are located on the sealing ring.
Improvement for the present invention, the tubular body and the fixed ring be POM, PP, ABS or PC material injection at
Type.
For the present invention as a result of including tubular body and at least one connector, the connector includes fixed ring and fastener,
The fastener is plugged in the fixed ring, and the fixed ring is located in one end of the tubular body, by snap-in structure with
The tubular body connection, the snap-in structure are that predetermined distance is equipped at least two on the side wall of the tubular body
Hook groove is equipped with, and lifting lug that shape substantially identical identical with the groove number, the lifting lug on the outer wall of the fixed ring
The structure being hooked in the hook groove；When the present invention has connection extension tube attached, the Fluid pressure of extension tube attached is bigger, the tubular body
Just engage with the connector tighter, both is not in the advantages of falling off.
Description of the drawings
Fig. 1 is the main structure diagram of the present invention.
Fig. 2 is a kind of schematic cross-sectional view in direction of the present invention.
Fig. 3 is the decomposition texture schematic diagram of the present invention.
Fig. 4 is the structural schematic diagram after present invention combination.
Specific implementation mode
In the description of the present invention, it is to be understood that, "center" in term, "upper", "lower", "front", "rear", " left side ",
The orientation or positional relationship of instructions such as " right sides " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing this hair
Bright and simplified description, does not indicate or imply the indicated device or component must have a particular orientation, with specific orientation
Construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation " " connects
Connect ", " connected " shall be understood in a broad sense, can also be dismantling connection, or be integrally connected for example, it may be being fixedly connected；It can be with
It is to be connected directly, can also be can be the connection of two component internals indirectly connected through an intermediary.For this field
For those of ordinary skill, above-mentioned term can be understood in concrete meaning of the invention with concrete condition.
Fig. 1-Fig. 4 is referred to, Fig. 1-Fig. 4 revealed is a kind of Novel quick joint, including tubular body 1 and at least one
A connector 2, the connector 2 include fixed ring 21 and fastener 22, and the fastener 22 is plugged in the fixed ring 21, the fixation
Ring 21 is located in one end of the tubular body 1, is connect with the tubular body 1 by snap-in structure, the snap-in structure is
Predetermined distance is equipped at least two hook grooves 11 on the side wall of the tubular body 1, on the outer wall of the fixed ring 21
Equipped with identical with 11 quantity of the groove, and the lifting lug 211 that shape is substantially identical, the lifting lug 211 are hooked in the hook groove 11；
At least two hook groove 11 is four hook grooves 11 being evenly arranged, and it is in tilt inwardly downward that the lifting lug 211, which can be arranged, this
Sample, which is put, is just connected together the tubular body 1 and the fixed ring 21, and at least one connector 2 is two connectors 2,
In straight-through or elbow；When connecting extension tube attached, when hydraulic pressure or bigger air pressure, state tubular body 1 and the connector 2 just engaging more
Tightly.
Preferably, the fixed ring 21 includes first annular portion and the second ring part, and the inside of second ring part is in
It is tubaeform,（It does not identify）, the small one end of the second ring part internal diameter connects with the one end in the first annular portion, and described second
The internal diameter of the small one end of ring part internal diameter is more than the internal diameter in first annular portion, forms ring-shaped step, first ring portion and second
Ring part is integral structure；Alternatively, the internal diameter of 21 outer end face of the fixed ring is less than the internal diameter of inner face, the fixed ring 21 is in
It is tubaeform（It does not identify）.
Preferably, the fastener 22 includes annular seating 221 and claw 222, and the claw 222 is along the annular seating 221
What the periphery of endoporus was formed to one end extension, the hook tabs for blocking extension tube attached is equipped on the inner wall of the claw 222
224, annular protrusion 223 is equipped on the outer wall of the claw 222, the claw 222 is axially arranged at least 1 gap, makes
The claw 222 to contract or can be flared out；The hook tabs 224 is stainless steel substrates（SUS303 or SUS304）Or copper closes
Gold（Preferential selection beryllium-bronze, phosphor bronze or the higher copper alloy of other toughness）, the hook tabs 224 is in tilt inwardly downward,
Angle between 22 inner wall axial direction of the hook tabs 224 and the claw selects between 35 ° -45 °；It can be in the annular seating
221 far from flare（It does not identify）One end setting be in intilted infundibulate（It does not identify）, in the annular protrusion 223
One end setting it is tapered, can put just the claw 222 is inserted in the fixed ring in this way, when the fastener 22 is inserted in institute
When stating fixed ring 21 and drawing from inside to outside, the inclined-plane of the annular protrusion 223 and the flare abuts, claw 222 to contract,
Claw 222 is set the more to lock the more tight by extension tube attached, when pressing inward against fastener 22, the get along well inclined-plane of the flare of claw 222 supports
It connects, the claw 222 restores original size, can extract extension tube attached out outside the connector 2；At least 1 gap is 2-
4 gap, 2-4 gap of setting is the intensity that should ensure the claw 222, makes claw 222 to contract or outside again
The amplitude bigger of opening.
Preferably, further include positioning device, the positioning device is being axially arranged with to 1 in 1 inner wall of the tubular body
Locating slot（It is invisible in figure）, the substantially identical protrusion of shape is equipped on the outer wall of the fixed ring 21（It can not in figure
See）；Alternatively, being axially arranged with protrusion in 1 inner wall of the tubular body, positioned in being axially arranged with to 1 for 21 outer wall of fixed ring
Slot, the protrusion can be a protrusion, salient point, multiple salient points are linked to be one or a protrusion is divided into multistage；Described at least 1
Locating slot is 2-4 locating slots being evenly arranged, and it is to facilitate location and installation that multiple locating slots and 1 protrusion, which are arranged, as long as raised
Alignment any of which locating slot can realize positioning.
Preferably, it is equipped with ring-shaped step in the tubular body 1, sealing ring 12, institute are equipped on the ring-shaped step
Fixed ring 21 is stated to be located on the sealing ring 12.
Preferably, the tubular body 1 and the fixed ring 21 are the moldings of POM, PP, ABS or PC material injection；The present invention
It is bigger due to the use of the Fluid pressure for working as extension tube attached, the tighter structure that tubular body 1 and the connector 2 just engage is stated, because
This can use relatively cheap material, cost-effective on raw material.
Preferably, the tubular body 1 can set three connectors 2, be in T-shaped or " Y " font（It does not draw）；Also
Four connectors 2 can be set, are in " ten " font（It does not draw）, can thus meet different take over demands.
It should be noted that explaining in detail for the above embodiment, purpose, which is only that, explains the present invention,
In order to can preferably explain the present invention, still, these descriptions cannot with any explanation at being limitation of the present invention,
In particular, each feature described in various embodiments mutually can also be combined arbitrarily, to form other embodiment party
Formula, in addition to there is clearly opposite description, these features should be understood to can be applied in any one embodiment, and not
It is limited only to described embodiment.
Claims (10)
1. a kind of Novel quick joint, including tubular body（1）With at least one connector（2）, it is characterised in that：The connector（2）
Including fixed ring（21）And fastener（22）, the fastener（22）It is plugged on the fixed ring（21）It is interior, the fixed ring（21）If
In the tubular body（1）One end in, pass through snap-in structure and the tubular body（1）Connection, the snap-in structure be
The tubular body（1）Side wall on predetermined distance be equipped at least two hook grooves（11）, in the fixed ring（21）It is outer
Wall is equipped with and the groove（11）Quantity is identical, and the lifting lug that shape is substantially identical（211）, the lifting lug（211）It is hooked in institute
State hook groove（11）It is interior.
2. Novel quick joint according to claim 1, it is characterised in that：The fixed ring（21）Including first annular portion and
Second ring part, the inside flare of second ring part, small one end of the tubaeform internal diameter and described first annular
The one end in portion connects, and the internal diameter of described small one end of tubaeform internal diameter is more than the internal diameter in first annular portion, forms ring-shaped step.
3. Novel quick joint according to claim 1, it is characterised in that：The fixed ring（21）The internal diameter of outer end face is less than
The internal diameter of inner face, the fixed ring（21）Flare.
4. Novel quick joint according to claim 1,2 or 3, it is characterised in that：The fastener（22）Including annular seating
（221）And claw（222）, the claw（222）It is along the annular seating（221）The periphery of endoporus extends to one end and is formed
, in the claw（222）Inner wall be equipped with hook tabs for blocking extension tube attached（224）, in the claw（222）Outer wall
It is equipped with annular protrusion（223）, the claw（222）Be axially arranged at least 1 gap, make the claw（222）It can be to
Contract is flared out.
5. Novel quick joint according to claim 4, it is characterised in that：At least 1 gap is 2-4 gap.
6. according to the Novel quick joint described in claim 1,2,3 or 5, it is characterised in that：Further include positioning device, the positioning
Device is in the tubular body（1）Inner wall is axially arranged with to 1 locating slot, in the fixed ring（21）Outer wall be equipped with
The substantially identical protrusion of shape.
7. Novel quick joint according to claim 4, it is characterised in that：Further include positioning device, the positioning device is
In the tubular body（1）Inner wall is axially arranged with to 1 locating slot, in the fixed ring（21）Outer wall be equipped with shape base
This identical protrusion.
8. Novel quick joint according to claim 6, it is characterised in that：At least 1 locating slot is evenly arranged
2-4 locating slots.
9. according to the Novel quick joint described in claim 1,2,3,5,7 or 8, it is characterised in that：In the tubular body（1）It is interior
Equipped with ring-shaped step, sealing ring is equipped on the ring-shaped step（12）, the fixed ring（21）It is located at the sealing ring（12）
On.
10. according to the Novel quick joint described in claim 1,2,3,5,7 or 8, it is characterised in that：The tubular body（1）With
The fixed ring（21）It is the molding of POM, PP, ABS or PC material injection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810889612.9A CN108799670A (en) | 2018-08-07 | 2018-08-07 | Novel quick joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810889612.9A CN108799670A (en) | 2018-08-07 | 2018-08-07 | Novel quick joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108799670A true CN108799670A (en) | 2018-11-13 |
Family
ID=64079470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810889612.9A Pending CN108799670A (en) | 2018-08-07 | 2018-08-07 | Novel quick joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108799670A (en) |
Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1146275A1 (en) * | 2000-04-12 | 2001-10-17 | COMAP société anonyme | Dismountable pipe connection device |
| EP1521027A1 (en) * | 2003-10-02 | 2005-04-06 | Comap | Disconnection device for quick coupling |
| KR20060040999A (en) * | 2004-11-08 | 2006-05-11 | 주식회사 대륙금속 | Socket enabling one-touch connection of pipe and pipe provided with the same |
| CN1862069A (en) * | 2006-05-17 | 2006-11-15 | 杨得来 | Pipejoint |
| CN201057330Y (en) * | 2006-10-16 | 2008-05-07 | 北京万商集贸易有限责任公司 | Integral fast pipe interface, joint and blanking adapter |
| CN201187650Y (en) * | 2008-04-22 | 2009-01-28 | 浙江兴鑫爱特铜业有限公司 | Fast connecting structure of pipe |
| CN101761719A (en) * | 2009-08-11 | 2010-06-30 | 叶炎彬 | Rapid pipeline connector |
| CN202100866U (en) * | 2011-05-19 | 2012-01-04 | 许道泽 | Quick connector for pipelines |
| CN202501139U (en) * | 2012-03-22 | 2012-10-24 | 常州升腾管业有限公司 | Pipeline connecting device |
| CN102788213A (en) * | 2012-08-01 | 2012-11-21 | 许道泽 | Quick coupling |
| CN102927392A (en) * | 2012-10-20 | 2013-02-13 | 史在恒 | Quick coupling |
| US20130069361A1 (en) * | 2011-09-20 | 2013-03-21 | Ying Lin Cai | Leakage-free Pipe Fitting of Quick Connection for Reverse Osmosis Membrane (RO) water treatment unit of household |
| CN103162038A (en) * | 2011-12-14 | 2013-06-19 | 朱辉 | Buckle foot structure for pipe joint seal locking |
| TW201350721A (en) * | 2012-06-04 | 2013-12-16 | Chao-Fou Hsu | Leakage-proof structure of quick connection pipe joint |
| CN204387552U (en) * | 2014-12-03 | 2015-06-10 | 浙江超润润滑元件有限公司 | The fast inserting structure of pipe joint |
| CN204647646U (en) * | 2015-04-30 | 2015-09-16 | 邓卫优 | A kind of dog clutch and joint thereof |
| CN105546239A (en) * | 2016-01-29 | 2016-05-04 | 富阳市中荷电子有限公司 | External connecting type buckle structure |
| CN106122632A (en) * | 2016-08-18 | 2016-11-16 | 张强 | Novel joint |
| CN208651909U (en) * | 2018-08-07 | 2019-03-26 | 李学谦 | Novel quick joint |
-
2018
- 2018-08-07 CN CN201810889612.9A patent/CN108799670A/en active Pending
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1146275A1 (en) * | 2000-04-12 | 2001-10-17 | COMAP société anonyme | Dismountable pipe connection device |
| EP1521027A1 (en) * | 2003-10-02 | 2005-04-06 | Comap | Disconnection device for quick coupling |
| KR20060040999A (en) * | 2004-11-08 | 2006-05-11 | 주식회사 대륙금속 | Socket enabling one-touch connection of pipe and pipe provided with the same |
| CN1862069A (en) * | 2006-05-17 | 2006-11-15 | 杨得来 | Pipejoint |
| CN201057330Y (en) * | 2006-10-16 | 2008-05-07 | 北京万商集贸易有限责任公司 | Integral fast pipe interface, joint and blanking adapter |
| CN201187650Y (en) * | 2008-04-22 | 2009-01-28 | 浙江兴鑫爱特铜业有限公司 | Fast connecting structure of pipe |
| CN101761719A (en) * | 2009-08-11 | 2010-06-30 | 叶炎彬 | Rapid pipeline connector |
| CN202100866U (en) * | 2011-05-19 | 2012-01-04 | 许道泽 | Quick connector for pipelines |
| US20130069361A1 (en) * | 2011-09-20 | 2013-03-21 | Ying Lin Cai | Leakage-free Pipe Fitting of Quick Connection for Reverse Osmosis Membrane (RO) water treatment unit of household |
| CN103162038A (en) * | 2011-12-14 | 2013-06-19 | 朱辉 | Buckle foot structure for pipe joint seal locking |
| CN202501139U (en) * | 2012-03-22 | 2012-10-24 | 常州升腾管业有限公司 | Pipeline connecting device |
| TW201350721A (en) * | 2012-06-04 | 2013-12-16 | Chao-Fou Hsu | Leakage-proof structure of quick connection pipe joint |
| CN102788213A (en) * | 2012-08-01 | 2012-11-21 | 许道泽 | Quick coupling |
| CN102927392A (en) * | 2012-10-20 | 2013-02-13 | 史在恒 | Quick coupling |
| CN204387552U (en) * | 2014-12-03 | 2015-06-10 | 浙江超润润滑元件有限公司 | The fast inserting structure of pipe joint |
| CN204647646U (en) * | 2015-04-30 | 2015-09-16 | 邓卫优 | A kind of dog clutch and joint thereof |
| CN105546239A (en) * | 2016-01-29 | 2016-05-04 | 富阳市中荷电子有限公司 | External connecting type buckle structure |
| CN106122632A (en) * | 2016-08-18 | 2016-11-16 | 张强 | Novel joint |
| CN208651909U (en) * | 2018-08-07 | 2019-03-26 | 李学谦 | Novel quick joint |
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| PB01 | Publication | ||
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