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CN107166069B - Controllable time-lapse faucet - Google Patents

Controllable time-lapse faucet Download PDF

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Publication number
CN107166069B
CN107166069B CN201710477364.2A CN201710477364A CN107166069B CN 107166069 B CN107166069 B CN 107166069B CN 201710477364 A CN201710477364 A CN 201710477364A CN 107166069 B CN107166069 B CN 107166069B
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CN
China
Prior art keywords
spool
pole
center
pipeline
fixed block
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.)
Active
Application number
CN201710477364.2A
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Chinese (zh)
Other versions
CN107166069A (en
Inventor
余成鹏
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Individual
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Individual
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Filing date
Publication date
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Priority to CN201710477364.2A priority Critical patent/CN107166069B/en
Publication of CN107166069A publication Critical patent/CN107166069A/en
Application granted granted Critical
Publication of CN107166069B publication Critical patent/CN107166069B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K21/00Fluid-delivery valves, e.g. self-closing valves
    • F16K21/04Self-closing valves, i.e. closing automatically after operation
    • F16K21/06Self-closing valves, i.e. closing automatically after operation in which the closing movement, either retarded or not, starts immediately after opening
    • F16K21/08Self-closing valves, i.e. closing automatically after operation in which the closing movement, either retarded or not, starts immediately after opening with ball-shaped closing members
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0605Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0647Spindles or actuating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0663Packings
    • F16K5/0689Packings between housing and plug
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08Details
    • F16K5/14Special arrangements for separating the sealing faces or for pressing them together
    • F16K5/20Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
    • F16K5/201Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Multiple-Way Valves (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

The invention discloses a kind of controllable time-lapse faucets.Controllable time-lapse faucet, the spool of opening and closing is controlled including pipeline, the handle for pressing formula, center-pole and rotation, center-pole both ends connect spool and handle, fixed block and sealing ring are additionally provided between the pipeline and center-pole, center-pole is arranged in fixed block and sealing ring, and the center-pole is slidably connected with pipeline, fixed block, and center-pole connects spool and handle and moves up and down perpendicular to pipeline, inner wall of the pipe below spool is connected with fluid-tight elastic plate, and the elastic plate is close to spool;The center-pole outer wall above fixed block is equipped with baffle ring, is arranged with the elastic component for resetting center-pole upwards on center-pole, the elastic component is between baffle ring and fixed block.Handle can press up and down, also can be rotated, the lasting water flowing of time-lapse faucet can be realized, leading water flowing may be implemented and be automatically closed afterwards for a period of time.

Description

Controllable time-lapse faucet
The present invention be directed to application No. is 201510789807.2, the applying date is on November 16th, 2015, entitled controllable Time-lapse faucet a case division.
Technical field
The present invention relates to hardware valve arrangement technical fields, it is a kind of controllable time-lapse faucet.
Background technique
Faucet is a kind of nickname of valve, and the structure of valve includes valve body, and valve chamber is equipped in valve body, is equipped with valve in valve chamber Core is connected with valve rod on spool.Various valves can be all used in every field such as agricultural, industry, however, having a variety of The valve body for controlling the method for liquid flowing is less, and it is impossible to meet needs.
Currently, time-lapse faucet in the market is more common in public drinking fountain stand, public lavatory etc., time-lapse faucet type is very numerous It is more, have it is mechanical there are also infrared ray etc..Time-lapse faucet has delay, self-closing, and health is not limited, water-saving result by waterpower Up to 50% it is significant the features such as.Only need to click or body close to when faucet open, can be automatically closed after leaving, both side Just having will not cross contamination.Since mechanical time-lapse faucet is without being powered, the range of mechanical time-lapse faucet application is more Extensively.
But the usage mode of existing mechanical time-lapse faucet is more single, if user needs persistently to supply water, needs Ceaselessly to go to press the handle on faucet, realize it is lasting do not cut off the water supply, operate it is relatively complicated.
Summary of the invention
Goal of the invention of the invention is to provide a kind of controllable prolong to solve the problems, such as that time-lapse faucet can not continue to supply water Shi Longtou, can be delayed water supply, can also be carried out continuing water supply according to user.
In order to achieve the above-mentioned object of the invention, the invention adopts the following technical scheme:
Controllable time-lapse faucet controls the spool of opening and closing including pipeline, the handle for pressing formula, center-pole and rotation, in Core bar both ends connection spool and handle, the spool are located in pipeline, and the handle is located at pipeline outer wall, the pipeline and center Fixed block and sealing ring are additionally provided between bar, center-pole is arranged in fixed block and sealing ring, the center-pole and pipeline, fixed block It is slidably connected, center-pole connects spool and handle and moves up and down perpendicular to pipeline, and the inner wall of the pipe below spool is connected with not Permeable elastic plate, the elastic plate are close to spool;The center-pole outer wall above fixed block is equipped with baffle ring, center The elastic component for resetting center-pole upwards is arranged on bar, the elastic component is between baffle ring and fixed block.
Further, valve deck is additionally provided with above the pipeline, the valve deck is fixed on above pipeline outer wall by fastener, The fixed block, sealing ring and baffle ring are respectively positioned in valve deck, and fixed block is mutually fixed with valve deck inner wall, and center-pole drives baffle ring in solid Determine to move back and forth between block and valve deck roof.
Further, the spool is spherical in shape, and the valve opening passed through for fluid is equipped in the middle part of spool, and the elastic plate is annular in shape And it is fitted closely with spool outer wall.
Further, the rounded sheet of the spool or spherical shape are equipped with above and below for spool in the pipeline below the spool Mobile attached chamber.
Further, the handle is in the form of a column, and handle top is dome, and sheet or strip are additionally provided on the side wall of handle Lever.
Compared with prior art, it using the controllable time-lapse faucet of above-mentioned technical proposal, has the following beneficial effects:
Using controllable time-lapse faucet of the invention, the delay that standard machinery formula time-lapse faucet may be implemented is supplied water and self-closing Function, while can persistently supply water as common gate valve again, user can select 2 kinds of water supply according to their own needs Mode.
Detailed description of the invention
Fig. 1 is the structural schematic diagram (continuing water flowing state) of the controllable time-lapse faucet of the present invention;
Fig. 2 is the structural schematic diagram (delay water flowing state) of the controllable time-lapse faucet of the present invention.
Appended drawing reference: 1, center-pole;10, baffle ring;2, spool;20, valve opening;3, pipeline;4, valve deck;40, fastener;5, solid Determine block;6, sealing ring;7, spring;8, handle;80, lever;9, attached chamber;90, elastic plate.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
The controllable time-lapse faucet such as one kind shown in Fig. 1 to 2, including pipeline 3, valve deck 4, spool 2, center-pole 1, handle, Fixed block 5 and sealing ring 6.Valve deck 4 is located at 3 top of pipeline, and fixed block 5 is fixed on 4 inner wall of valve deck, and center-pole 1 passes through fixed block 5, fixed block 5 can make center-pole 1 more stable, and 1 both ends of center-pole are separately connected handle and spool 2, and spool 2 is located in pipeline Portion, handle are located at 4 top of valve deck.
Valve deck is fixed on above pipeline by fastener 40 (such as bolt screw), facilitates the disassembly and installation of valve deck, when After leading internal appearance damage, valve casing can be taken away by fastener 40, to be overhauled to the component in pipeline, significantly The service life for increasing valve, reduces costs.
Spool 2 in the present embodiment is spherical spool, has valve opening 20 in the middle part of spool 2, drives valve by swing handle Core 2 rotates, and realizes the flowing of liquid in pipeline.
Center-pole 1 is slidably connected with valve deck, fixed block 5, and center-pole 1 can drive handle and spool to move up and down.Center-pole 1 Outer wall be further fixed on baffle ring 10, spring is equipped between baffle ring 10 and fixed block 5, spring pocket is set to 1 outer wall of center-pole, under spool The inner wall of the pipe of side is equipped with elastic plate 90, and in a ring, section is arc-shaped and fits closely with spool outer wall for elastic plate 90, annular Elastic plate 90 it is more easy to attach with spherical valve core, sealing performance is be more good.
(damping spring is i.e. in the market in common time-lapse faucet using damping spring delayed time system for spring in the present embodiment Delayed time system), damping spring delayed time system, which has the property that, needs biggish power when damping spring is just compressed, then Power when continuous compression is smaller compared to before.And when damping spring loses the power of compression, rebound has certain hysteresis quality, resistance Buddhist nun's spring just started will slowly expansion, 1-3 second or so just will be rapid and restore.
The side wall for pressing formula handle is equipped with lever 80, and convenient for users to rotating to handle, next can also be used for differentiating The open/close states of spool.
Pipeline below spool is equipped with attached chamber 9, and attached chamber 9 can increase the distance that spool moves up and down, if lacking attached chamber 9, then it needs to carry out the inner diameter of pipeline into increase by a relatively large margin, so that spool moves up and down, therefore adds attached chamber 9 Afterwards, the diameter of pipeline can be greatly reduced.
The opening that pipeline above spool leads to valve deck is equipped with segmental arc, direct identical as spool, the arc of the segmental arc Shape section is bonded completely with the shape of spool, can effectively increase sealing performance, and fluid is avoided to flow out from gap.
The time-lapse faucet of the present embodiment shares 2 kinds of usage modes: delay water flowing mode and lasting water flowing mode.
Continue water flowing mode:
As shown in Figure 1, under the action of the spring, spring contradicts baffle ring 10 and fixed block 5, since fixed block 5 is fixed on valve Lid inner wall, baffle ring 10 are compressed by spring, and spool contradicts completely with the inner wall above pipeline under the action of the spring, and fluid can not be from Spool top position passes through;Secondly as the setting of elastic plate 90, annular elastic plate 90 is fitted closely with spool outer wall, stream Body can not also pass through below spool, and faucet is in close state.
Handle is turned into the position Fig. 1,20 connecting pipe of valve opening on spool allows fluid in pipeline from valve opening 20 It inside continues through, realizes and continue water flowing.User's swing handle closes spool, can close faucet.
Be delayed water flowing mode:
As shown in Fig. 2, handle is turned to the position Fig. 2, spool is in close state, and fluid can not pass through valve opening 20.
At this time by pressing handle, center-pole 1 is pressed downward with movable valve plug and baffle ring 10, spool by elastic plate 90 outward Pressure, while 10 compressed spring of baffle ring, spool and the pipeline of top generate certain gap at this time, and the fluid in pipeline passes through spool The gap of top is flowed, and water is flowed out out of faucet.
When hand no longer presses handle, baffle ring 10 moves up under the action of the spring to set back, and drives center-pole 1, spool and handle move up together, the segmental arc of spool fitting under the action of the spring tightly and pipeline upper inner wall, Faucet is again at closed state at this time, and time-lapse faucet stops water flowing.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (2)

1. controllable time-lapse faucet, including pipeline (3), the handle (8) for pressing formula, center-pole (1) and rotation to control opening and closing Spool, center-pole (1) both ends connect spool and handle (8), and the spool is located in pipeline (3), and the handle (8) is located at pipeline (3) outer wall, is additionally provided with fixed block (5) and sealing ring (6) between the pipeline (3) and center-pole (1), center-pole (1) is arranged in Fixed block (5) and sealing ring (6), it is characterised in that:
The center-pole (1) is slidably connected with pipeline (3), fixed block (5), and center-pole (1) connects spool and handle (8) is simultaneously vertical It is moved up and down in pipeline (3), pipeline (3) inner wall below spool is connected with fluid-tight elastic plate (90), the elastic plate (90) it is close to spool;
Center-pole (1) outer wall above fixed block (5) is equipped with baffle ring (10), is arranged on center-pole (1) by center-pole (1) The elastic component (7) resetted upwards, the elastic component (7) are located between baffle ring (10) and fixed block (5);
The opening that pipeline above spool leads to valve deck is equipped with segmental arc;
Elastic component (7) is damping spring;
It being additionally provided with valve deck (4) above the pipeline (3), the valve deck (4) is fixed on above pipeline (3) outer wall by fastener, The fixed block (5), sealing ring (6) and baffle ring (10) are respectively positioned in valve deck (4), and fixed block (5) is mutually solid with valve deck (4) inner wall Fixed, baffle ring (10) is moved back and forth between fixed block (5) and valve deck (4) roof by the drive of center-pole (1);
The spool (2) is spherical in shape, and the valve opening (20) passed through for fluid is equipped in the middle part of spool (2), and the elastic plate (90) is in ring Shape is simultaneously fitted closely with spool (2) outer wall;
The handle (8) is in the form of a column, and is dome at the top of handle (8), the lever of sheet or strip is additionally provided on the side wall of handle (8) (80).
2. controllable time-lapse faucet according to claim 1, it is characterised in that: set in the pipeline (3) below the spool There is the attached chamber (9) moved up and down for spool.
CN201710477364.2A 2015-11-16 2015-11-16 Controllable time-lapse faucet Active CN107166069B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710477364.2A CN107166069B (en) 2015-11-16 2015-11-16 Controllable time-lapse faucet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510789807.2A CN105318035B (en) 2015-11-16 2015-11-16 Controllable time-lapse faucet
CN201710477364.2A CN107166069B (en) 2015-11-16 2015-11-16 Controllable time-lapse faucet

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201510789807.2A Division CN105318035B (en) 2015-11-16 2015-11-16 Controllable time-lapse faucet

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Publication Number Publication Date
CN107166069A CN107166069A (en) 2017-09-15
CN107166069B true CN107166069B (en) 2019-03-29

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CN201710477364.2A Active CN107166069B (en) 2015-11-16 2015-11-16 Controllable time-lapse faucet

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108972857B (en) * 2018-08-21 2020-04-28 郑州升达经贸管理学院 Precast beam automatic maintenance spray device
CN109114246B (en) * 2018-10-10 2020-11-20 响水格思琪科技有限公司 Self-aligning dual hydraulic ball valve
CN111810669B (en) * 2020-07-31 2021-04-13 衡阳泰豪通信车辆有限公司 Using method of shelter water supply system
CN114087408B (en) * 2021-09-28 2024-10-11 广州市锦德建材科技有限公司 Delay tap

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60172782A (en) * 1984-02-16 1985-09-06 Maezawa Kiyuusou Kogyo Kk Speed moderating device in water shut-off valve
CN86205918U (en) * 1986-07-30 1987-02-04 李中南 Time-delay and adjustable tap
US6880573B2 (en) * 2003-07-31 2005-04-19 B & K Industries Frost free valve assembly
CN101551023B (en) * 2009-04-28 2010-10-13 胡金木 Ball valve
US8100141B2 (en) * 2010-05-27 2012-01-24 Slupecki Raymond H Water supply control assembly with automatic shut-off and duty cycle reset
CN201764056U (en) * 2010-08-20 2011-03-16 鹏威(厦门)工业有限公司 Time-lapse faucet
CN202228752U (en) * 2011-08-17 2012-05-23 赵宝林 Normally closed valve
CN203979481U (en) * 2014-07-26 2014-12-03 浙江时代铸造有限公司 A kind of ball valve
CN204042114U (en) * 2014-08-15 2014-12-24 中正科技阀门有限公司 Automatic-reset ball valve
CN204239798U (en) * 2014-10-28 2015-04-01 志远科技有限公司 A kind of high temperature resistant upper-mounting type ball valve
CN105240541B (en) * 2015-11-09 2017-07-28 荆门市中金铝业铸造有限公司 Air-flow butterfly valve
CN205155223U (en) * 2015-11-16 2016-04-13 余成鹏 Controllable time delay tap

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Publication number Publication date
CN107166069A (en) 2017-09-15
CN105318035A (en) 2016-02-10
CN105318035B (en) 2017-09-29

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SE01 Entry into force of request for substantive examination
GR01 Patent grant
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EE01 Entry into force of recordation of patent licensing contract

Application publication date: 20170915

Assignee: WENCHENG JIANCHUANG TECHNOLOGY Co.,Ltd.

Assignor: Yu Chengpeng

Contract record no.: X2022330000217

Denomination of invention: Controllable time delay faucet

Granted publication date: 20190329

License type: Common License

Record date: 20220614

EE01 Entry into force of recordation of patent licensing contract