CN103511686A - Backflow preventing device structure - Google Patents
Backflow preventing device structure Download PDFInfo
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- CN103511686A CN103511686A CN201310428497.2A CN201310428497A CN103511686A CN 103511686 A CN103511686 A CN 103511686A CN 201310428497 A CN201310428497 A CN 201310428497A CN 103511686 A CN103511686 A CN 103511686A
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- valve
- water
- valve plate
- described valve
- plate
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
- F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention provides a backflow preventing device structure. The backflow preventing device structure comprises a shell body, a water inlet valve, a water outlet, a water escape valve and a main valve rod, and further comprises an elastic sealing device, wherein the water inlet valve, the water outlet, the water escape valve and the main valve rod are located in the shell and the interior of the shell is divided into a main cavity and a control cavity by the elastic sealing device. A water inlet, a water outlet and a water escape opening are formed in the shell wall of the main cavity; the water inlet valve, the water outlet valve and the water escape valve are installed in the water inlet, the water outlet and the water escape opening respectively; one end of the main valve rod is connected with the water escape valve, and the other end of the main valve rod is connected with the elastic sealing device. The backflow preventing device structure has the advantages that due to the adoption of the technical scheme that the water inlet is provided with two valve plates, in the zero-flow state of the water supply process, when the water supply pressure is fluctuated, the control cavity is in an airtight state, the water escape valve is in a closed state, and accordingly water resources are prevented from being wasted; furthermore, when any valve plate is damaged and backflow happens, water can be timely released and the water in the water inlet is prevented from being polluted.
Description
Technical field
The present invention relates to field of check valves, especially relate to a kind of backflow preventer structure.
Background technique
Current municipal water supply pressure transient, cause the water intake pressure of backflow preventer can produce fluctuation, when inlet pressure undulating value is greater than the drain valve starting differential pressure value Δ p of backflow preventer, the discharge opening of general backflow preventing structure can be opened to reduce middle pressure and meet Δ p value, in use can there is interrupted sluicing phenomenon when water (particularly in backflow preventer downstream not) in backflow preventer like this, causes the waste of water resources.This is not the sole mass problem of product, but municipal water supply working condition pressure changing value surpasses backflow preventer drain valve, opens settings, causes the unlatching of backflow preventer drain valve to cause.Therefore a lot of water utilities all refuse to use to backflow preventer, and one of reason is exactly to dislike water waste serious.If can not fundamentally not guarantee that again water quality is not polluted but do not install backflow preventer additional, this just needs a kind of structure, when normal water supply when there is fluctuation in water intake pressure, can prevent intermittently opening of drain valve, when medium occur to flow backwards and backflow preventer water inlet safety check damages or can open rapidly drain valve when poorly sealed, release refluence water simultaneously, effectively prevent from that water quality from flowing backwards to enter water supply network.
Summary of the invention
The object of this invention is to provide a kind of simple in structure, safe and reliable backflow preventer structure.
Technological scheme of the present invention is: a kind of backflow preventer structure, comprise housing and the inlet valve, outlet valve, drain valve and the main valve stem that are positioned at described enclosure interior, also comprise elastic sealing device, described elastic sealing device is divided into main chamber and two cavitys of control chamber by described enclosure interior, wherein on the shell wall in main chamber with these three openings of water intake, water outlet and discharge opening, described inlet valve, outlet valve and drain valve are arranged on respectively this three openings, one end of described main valve stem is connected with described drain valve, and the other end is connected with described elastic sealing device;
Described housing is provided with passage I, and described passage I is communicated with described control chamber with described water intake;
Described inlet valve comprises valve plate I and valve plate II, and described valve plate I is not when being stressed, and the opening to described passage I in described water inlet seals; Described valve plate II seals described water intake when not being stressed.
Preferably, described inlet valve also comprises valve seat, valve rod and resetting means, one end of described valve rod is successively through described resetting means, valve seat, valve plate I and valve plate II, described valve plate II is fixedly connected with described valve rod, described valve plate I is connected with described valve handle activity, between described valve plate II and described valve plate I, be provided with elastic device, described resetting means is connected with the valve seat being fixed on described housing.
Preferably, the inner chamber of described valve seat has place's step, described valve plate I is stuck in described step place, and the step of the outer side contacts of described valve seat and described valve plate I is provided with a circle projection I, when described valve plate I contacts with protruding I, can play sealing effect, gapped between described valve plate I and the inwall of described valve seat, one side contacts of the bottom of described valve seat and described valve plate II, and the bottom of described valve seat is provided with a circle projection II, when described valve plate II contacts with protruding II, can play sealing effect, the opening of described passage I in described water inlet is positioned on described valve seat, and between described two circle projections.
Preferably, described resetting means be end cap and and spring, described end cap is fixed on the other end of described valve rod, one end of described spring props up described end cap, the other end is fixed on described valve seat.
Preferably, described elastic sealing device is elastomer diaphragm.
Preferably, between described valve plate I and described valve rod, be provided with seal ring.
Preferably, the elastic device arranging between described valve plate II and described valve plate I is several little springs.
Advantage and good effect that the present invention has are:
Owing to adopting technique scheme, inlet valve is provided with two valve plates, when normal water supply and backflow preventer downstream are dead head condition, now two valve plates of inlet valve are all in closed condition, valve plate I is by the sealing of passage I, and control chamber becomes an airtight cavity, and pressure is P2.When outlet valve damages, main cavity pressure P3 equals the pressure P 4 of water outlet, when water outlet pressure rises for a certain reason, intake pressure P1 rises relatively, be that Δ P=(P1-P3) reduces, when two valve plates of inlet valve are intact and there is no jam, control chamber is airtight cavity, and main valve stem can not move upward, and drain valve is in closed condition, can not sluice, prevent the waste of water resources; When any valve plate of inlet valve is damaged or jam and when water quality occurring flowing backwards, control chamber is communicated with water intake Huo Zhu chamber, refluence water is released in the main valve stem drive drain valve unlatching that moves upward in time, has avoided the pollution of refluence water quality to water inlet water quality.
In like manner, if water intake pressure reduces for a certain reason or during decompression, Δ P reduces or becomes negative value, when two valve plates of inlet valve are intact and there is no jam, control chamber is airtight cavity, main valve stem can not move upward, be drain valve in closed condition, can not sluice, prevent the waste of water resources; When any valve plate of inlet valve is damaged or jam and when water quality occurring flowing backwards, control chamber is communicated with water intake Huo Zhu chamber, refluence water is released in the main valve stem drive drain valve unlatching that moves upward in time, has avoided the pollution of refluence water quality to water inlet water quality.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of valve seat and valve plate joint in the present invention.
In figure:
1, outlet valve 2, drain valve 3, main valve stem 4, elastic sealing device
5 ,Zhu chambeies 6, control chamber 7, water intake 8, water outlet
9, discharge opening 10, passage I 101, valve seat 102, valve rod
103, valve plate I 104, valve plate II 105, resetting means
Embodiment
Below in conjunction with the drawings and the specific embodiments, the invention will be further described.
As depicted in figs. 1 and 2, the present invention includes housing and the inlet valve, outlet valve 1, drain valve 2 and the main valve stem 3 that are positioned at described enclosure interior, also comprise elastic sealing device 4, described elastic sealing device 4 is divided into main chamber 5 and 6 two cavitys of control chamber by described enclosure interior, wherein on the shell wall in main chamber 5 with water intake 7, water outlet 8 and discharge opening 9 these three openings, described inlet valve, outlet valve 1 and drain valve 2 are arranged on respectively this three openings, one end of described main valve stem 3 is connected with described drain valve 2, and the other end is connected with described elastic sealing device 4; Described elastic sealing device 4 is elastomer diaphragm.
Described inlet valve comprises valve seat 101, valve rod 102, valve plate I 103, valve plate II 104 and resetting means 105, described valve rod 102 one end is successively through described resetting means 105, valve seat 101, valve plate I 103 and valve plate II 104, described valve plate II 104 is fixedly connected with described valve rod 102, described valve plate I 103 is flexibly connected with described valve rod 102, between described valve plate II 104 and described valve plate I 103, be provided with elastic device 106, described resetting means 105 is connected with the valve seat 101 being fixed on described housing;
Between described valve plate I 103 and described valve rod 102, be provided with seal ring.
Described resetting means 105 be end cap and and spring, described end cap is fixed on the other end of described valve rod 102, one end of described spring props up described end cap, the other end is fixed on described valve seat 101.
The elastic device 106 arranging between described valve plate II 104 and described valve plate I 103 is several little springs.
Described housing is provided with passage I 10, described passage I 10 is communicated with described control chamber 6 with described water intake 7, described passage I 10 is positioned on described valve seat 101 at the opening at described water intake 7 places, and described valve plate I 103 seals it when not being stressed;
Described valve plate II 104 seals described water intake 7 when not being stressed.
The inner chamber of described valve seat 101 has place's step, described valve plate I 103 is stuck in described step place, and described valve seat 101 is provided with a circle projection I with the step of described valve plate I 103 outer side contacts, when described valve plate I 103 contacts with protruding I, can play sealing effect, gapped between described valve plate I 103 and the inwall of described valve seat 101, one side contacts of the bottom of described valve seat 101 and described valve plate II 104, and the bottom of described valve seat 101 is provided with a circle projection II, when described valve plate II 104 contacts with protruding II, can play sealing effect, the opening of described passage I 10 in described water inlet is positioned on described valve seat 101, and between described two circle projections.
During normal water inlet, it is movable to the right that pressure of supply water P1 orders about described valve plate I 103, open the passage II on described valve seat 101, make water enter control chamber 6, push down diaphragm, drive the action downwards of described main valve stem 3 to cause described drain valve 2 to be closed, increase along with intake pressure, press water is pushed described valve plate II 104 open, water normally passes through backflow preventer, described drain valve 2 cuts out and does not sluice, now water intake pressure P 1 equals control chamber pressure P 2, between pressure P 3 in P1Yu Zhu chamber, there is a pressure difference Δ P, as P1-P3 > drain valve cuts out during Δ P, when P1-P3≤Δ P, drain valve is opened.
When backflow preventer is when dead head condition and water intake decompression or water intake pressure produce fluctuation, described valve plate I 103 and valve plate II 104 are all in closed condition, described passage II is sealed, described control chamber 6 is air-tight state, the interior medium of described control chamber 6 can not pass in and out, main valve stem 3 can not produce motion, and described drain valve 2 is in closed condition.
When described outlet valve 1 damages or because other situations are while occurring to flow backwards, main cavity pressure P3 increases, if now valve plate I 103 and valve plate II 104 do not have jam or damage, drain valve 2 is in closed condition, and drain valve can not opened sluicing; If valve plate I 103 and valve plate II 104 have jam or damage, during P1-P3 < Δ p, described diaphragm moves upward and drives described main valve stem 3 to move up, and opens drain valve 2, sluices.
The present invention can realize, and in water inlet process, in the situation that pressure of supply water P1 fluctuates, drain valve, also at the state of cutting out, prevents the waste of water resources; And when occurring to flow backwards, can sluice in time, avoid the pollution of Liao Dui water inlet water quality.
Above embodiment has been described in detail the present invention, but described content is only preferred embodiment of the present invention, can not be considered to for limiting practical range of the present invention.All equalization variations of doing according to the present patent application scope and improvement etc., within all should still belonging to patent covering scope of the present invention.
Claims (7)
1. a backflow preventer structure, comprise housing and the inlet valve that is positioned at described enclosure interior, outlet valve (1), drain valve (2) and main valve stem (3), it is characterized in that: also comprise elastic sealing device (4), described elastic sealing device (4) is divided into main chamber (5) and (6) two cavitys of control chamber by described enclosure interior, wherein on the shell wall of main chamber (5) with water intake (7), these three openings of water outlet (8) and discharge opening (9), described inlet valve, outlet valve (1) and drain valve (2) are arranged on respectively this three openings, one end of described main valve stem (3) is connected with described drain valve (2), the other end is connected with described elastic sealing device (4),
Described housing is provided with passage I (10), and described passage I (10) is communicated with described control chamber (6) with described water intake (7);
Described inlet valve comprises valve plate I (103) and valve plate II (104), and described valve plate I (103) is not when being stressed, and the opening that described passage I (10) is located at described water intake (7) seals; Described valve plate II (104) seals described water intake (7) when not being stressed.
2. backflow preventer structure according to claim 1, it is characterized in that: described inlet valve also comprises valve seat (101), valve rod (102) and resetting means (105), one end of described valve rod (102) is successively through described resetting means (105), valve seat (101), valve plate I (103) and valve plate II (104), described valve plate II (104) is fixedly connected with described valve rod (102), described valve plate I (103) is flexibly connected with described valve rod (102), between described valve plate II (104) and described valve plate I (103), be provided with elastic device (106), described resetting means (105) is connected with the valve seat (101) being fixed on described housing.
3. backflow preventer structure according to claim 2, it is characterized in that: the inner chamber of described valve seat (101) has place's step, described valve plate I (103) is stuck in described step place, and described valve seat (101) is provided with a circle projection I with the step of the outer side contacts of described valve plate I (103), when described valve plate I (103) contacts with protruding I, can play sealing effect, gapped between the inwall of described valve plate I (103) and described valve seat (101), one side contacts of the bottom of described valve seat (101) and described valve plate II (104), and the bottom of described valve seat (101) is provided with a circle projection II, when described valve plate II (104) contacts with protruding II, can play sealing effect, the opening of described passage I (10) in described water inlet is positioned on described valve seat (101), and between described two circle projections.
4. according to the backflow preventer structure described in claim 2 or 3, it is characterized in that: described resetting means (105) for end cap and and spring, described end cap is fixed on the other end of described valve rod (102), one end of described spring props up described end cap, and the other end is fixed on described valve seat (101).
5. backflow preventer structure according to claim 1 and 2, is characterized in that: described elastic sealing device (4) is elastomer diaphragm.
6. according to the backflow preventer structure described in claim 2 or 3, it is characterized in that: between described valve plate I (103) and described valve rod (102), be provided with seal ring.
7. according to the backflow preventer structure described in claim 2 or 3, it is characterized in that: the elastic device (106) arranging between described valve plate II (104) and described valve plate I (103) is several little springs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310428497.2A CN103511686B (en) | 2013-09-17 | 2013-09-17 | A kind of backflow preventer structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310428497.2A CN103511686B (en) | 2013-09-17 | 2013-09-17 | A kind of backflow preventer structure |
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| Publication Number | Publication Date |
|---|---|
| CN103511686A true CN103511686A (en) | 2014-01-15 |
| CN103511686B CN103511686B (en) | 2016-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310428497.2A Active CN103511686B (en) | 2013-09-17 | 2013-09-17 | A kind of backflow preventer structure |
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| CN (1) | CN103511686B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982682A (en) * | 2014-05-26 | 2014-08-13 | 天津市国威给排水设备制造有限公司 | Online-maintained backflow preventer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5478928U (en) * | 1977-11-14 | 1979-06-05 | ||
| EP0084754A1 (en) * | 1982-01-26 | 1983-08-03 | SOCLA SA Société dite | Back flow preventer for hydraulic conduits |
| CN101749460A (en) * | 2008-12-10 | 2010-06-23 | 刘永 | Dual-membrane micro-resistant ultrashort backflow preventer |
| CN101985989A (en) * | 2010-10-12 | 2011-03-16 | 杭州春江阀门有限公司 | Backflow preventer with fault signal emitting device |
| CN102261499A (en) * | 2011-05-17 | 2011-11-30 | 天津市国威给排水设备制造有限公司 | Double-diaphragm backflow preventer without external piping and capable of preventing abnormal water drainage of water draining opening |
| CN103104724A (en) * | 2012-12-11 | 2013-05-15 | 天津市国威给排水设备制造有限公司 | Check valve with spring pre-tightening force adjustable |
| CN203477486U (en) * | 2013-09-17 | 2014-03-12 | 天津市倒流防止器制造有限公司 | Backflow prevention device structure |
-
2013
- 2013-09-17 CN CN201310428497.2A patent/CN103511686B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5478928U (en) * | 1977-11-14 | 1979-06-05 | ||
| EP0084754A1 (en) * | 1982-01-26 | 1983-08-03 | SOCLA SA Société dite | Back flow preventer for hydraulic conduits |
| CN101749460A (en) * | 2008-12-10 | 2010-06-23 | 刘永 | Dual-membrane micro-resistant ultrashort backflow preventer |
| CN101985989A (en) * | 2010-10-12 | 2011-03-16 | 杭州春江阀门有限公司 | Backflow preventer with fault signal emitting device |
| CN102261499A (en) * | 2011-05-17 | 2011-11-30 | 天津市国威给排水设备制造有限公司 | Double-diaphragm backflow preventer without external piping and capable of preventing abnormal water drainage of water draining opening |
| CN103104724A (en) * | 2012-12-11 | 2013-05-15 | 天津市国威给排水设备制造有限公司 | Check valve with spring pre-tightening force adjustable |
| CN203477486U (en) * | 2013-09-17 | 2014-03-12 | 天津市倒流防止器制造有限公司 | Backflow prevention device structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103982682A (en) * | 2014-05-26 | 2014-08-13 | 天津市国威给排水设备制造有限公司 | Online-maintained backflow preventer |
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| Publication number | Publication date |
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| CN103511686B (en) | 2016-07-06 |
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