CN203604733U - Backflow preventing device - Google Patents
Backflow preventing device Download PDFInfo
- Publication number
- CN203604733U CN203604733U CN201320780790.0U CN201320780790U CN203604733U CN 203604733 U CN203604733 U CN 203604733U CN 201320780790 U CN201320780790 U CN 201320780790U CN 203604733 U CN203604733 U CN 203604733U
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- China
- Prior art keywords
- valve
- valve plate
- described valve
- valve seat
- water
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims description 8
- 208000002925 dental caries Diseases 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000008400 supply water Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The utility model provides a backflow preventing device which comprises a shell, a water inlet valve, a water outlet valve, a water escape valve, a main valve rod and an elastic sealing device, wherein the water inlet valve, the water outlet valve, the water escape valve, the main valve rod and the elastic sealing device are arranged in the shell. The elastic sealing device divides the inside of the shell into a main cavity and a control cavity, a channel I is arranged on the shell and enables the control cavity and a water inlet to be communicated, the water inlet valve further comprises an annular valve seat II which is arranged on the right of a valve seat I, and the opening, located at the water inlet, of the channel I is located between the valve seat I and the valve seat II. The backflow preventing device has the advantages that through the technical scheme, in the water inflow process, under the condition that water supply pressure P1 fluctuates, the water escape valve is in a closed state, and waste of the water resource is prevented; when backflow happens, water can be timely drained, and pollution of water quality at the water inlet is avoided.
Description
Technical field
The invention relates to a kind of backflow preventer.
Background technique
Municipal water supply pressure transient at present, cause the water intake pressure of backflow preventer can produce fluctuation, in the time that pressure surge value is greater than the sluicing pressure difference Δ p of backflow preventer, discharge opening can be opened to reduce middle pressure and meet Δ p value, in use can there is interrupted sluicing phenomenon 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 is unstable caused.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 guarantee that again water quality is not polluted but do not install backflow preventer additional, this just needs a kind of structure, can effectively prevent from flowing backwards, and in the timing of water intake pressure instability, also can prevent intermittently opening of drain valve.
Innovation and creation content
The object of the invention is to provide a kind of simple in structure, safe and reliable backflow preventer.
The technological scheme of the invention is: a kind of backflow preventer, comprise housing and the inlet valve, outlet valve, drain valve, main valve stem and the elastic sealing device that are positioned at described enclosure interior, described enclosure interior is divided into main chamber and two cavitys of control chamber by described elastic sealing device, 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 seat I, valve plate I, valve plate II, resetting means and valve rod, one end of described valve rod is successively through described resetting means, valve seat I, valve plate I and valve plate II, described valve plate II is fixedly connected with one end of described valve rod, described valve plate I is connected with described valve handle activity, described resetting means is connected with the valve seat I being fixed on described housing, between described valve plate I and described valve plate II, be connected by elastic device, also comprise the valve seat II of ring-type, described valve seat II is arranged at described valve seat I the right, and be fixed in inner walls, described passage I at the opening of described water inlet between described valve seat I and valve seat II,
Described valve plate I is positioned at the right side of described valve seat I, and described valve plate I can block the blasthole of described valve seat I, and its right end face of described valve seat I is provided with a circle projection I, in the time that described valve plate I contacts with protruding I, can play sealing effect;
Described valve plate II is positioned at the right side of described valve seat II, and described valve plate II can block the blasthole of described valve seat II, and its right end face of described valve seat II is provided with a circle projection II, in the time that described valve plate II contacts with protruding II, can play sealing effect.
Preferably, between described valve plate I and described valve plate II, be provided with locating stud, rotate each other avoiding.
Preferably, the elastic device between described valve plate I and described valve plate II is spring, and the two ends of described spring lay respectively in the positioning hole that described valve plate I and described valve plate II be oppositely arranged.
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 in described valve seat I.
Preferably, between described valve plate I and described valve rod, be provided with seal ring.
Advantage and good effect that the invention has are:
Owing to adopting technique scheme, 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 in the time occurring to flow backwards, can sluice in time, avoid the pollution to water inlet water quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of the invention;
Fig. 2 is the structural representation of water intake part in the invention.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the invention is described further.
As depicted in figs. 1 and 2, the invention comprises housing and is positioned at inlet valve, outlet valve 1, drain valve 2, main valve stem 3 and the elastic sealing device 4 of described enclosure interior, described enclosure interior is divided into main chamber 5 and 6 two cavitys of control chamber by described elastic sealing device 4, wherein on the shell wall in main chamber 5 with these three openings of water intake, water outlet and discharge opening, 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 housing is provided with passage I 7, and described passage I 7 is communicated with described control chamber 6 with described water intake;
Described inlet valve comprises valve seat I 101, valve plate I 103, valve plate II 104, resetting means 105 and valve rod 106, one end of described valve rod 106 is successively through described resetting means 105, valve seat I 101, valve plate I 103 and valve plate II 104, described valve plate II 104 is fixedly connected with one end of described valve rod 106, described valve plate I 103 is flexibly connected with described valve rod 106, described resetting means 105 is connected with the valve seat I 101 being fixed on described housing, between described valve plate I 103 and described valve plate II 104, be connected by elastic device, also comprise the valve seat II 102 of ring-type, described valve seat II 102 is arranged at described valve seat I 101 the right, and be fixed in inner walls, described passage I 7 at the opening of described water inlet between described valve seat I 101 and valve seat II 102,
Described valve plate I 103 is positioned at the right side of described valve seat I 101, and described valve plate I 103 can be blocked the blasthole of described valve seat I 101, the its right end face of described valve seat I 101 is provided with a circle projection I, in the time that described valve plate I 103 contacts with protruding I, can play sealing effect;
Described valve plate II 104 is positioned at the right side of described valve seat II 102, and described valve plate II 104 can be blocked the blasthole of described valve seat II 102, the its right end face of described valve seat II 102 is provided with a circle projection II, in the time that described valve plate II 104 contacts with protruding II, can play sealing effect.
Between described valve plate I 103 and described valve plate II 104, be provided with locating stud, rotate each other avoiding.
Elastic device between described valve plate I 103 and described valve plate II 104 is spring, and the two ends of described spring lay respectively in the positioning hole that described valve plate I 103 and described valve plate II 104 be oppositely arranged.
Described resetting means 105 be end cap and and spring, described end cap is fixed on the other end of described valve rod 106, one end of described spring props up described end cap, the other end is fixed in described valve seat I 101.
Between described valve plate I 103 and described valve rod 106, be provided with seal ring.
When normal water inlet, it is movable to the right that pressure of supply water P1 orders about described valve plate I 103, open the opening of described passage I 7 in described water inlet, make water enter described control chamber 6, push down the elastic sealing device 4 being formed by diaphragm, drive the action downwards of described main valve stem 3 to cause described drain valve 2 to be closed, along with the increase of 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 P1 and main chamber, there is a pressure difference, the value of setting by elastic sealing device 4 as P1-P3> Δ P() time drain valve close, in the time of P2-P3≤Δ P, drain valve is opened.
When backflow preventer is in the time that 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 I 7 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, the medium in control chamber 6 can flow, and P2 can change, and in the time of P2-P3< Δ p, described diaphragm moves upward and drives described main valve stem 3 to move up, and opens drain valve 2, sluices.
The invention can guarantee, 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 in the time occurring to flow backwards, can sluice in time, avoid the pollution to water inlet water quality.
Above embodiment has been described in detail the invention, but described content is only for the preferred embodiment of the invention, can not be considered to the practical range for limiting the invention.All equalization variation and improvement etc. of doing according to the invention application range, within all should still belonging to the patent covering scope of the invention.
Claims (5)
1. a backflow preventer, comprise housing and the inlet valve that is positioned at described enclosure interior, outlet valve (1), drain valve (2), main valve stem (3) and elastic sealing device (4), described enclosure interior is divided into main chamber (5) and (6) two cavitys of control chamber by described elastic sealing device (4), wherein on the shell wall of main chamber (5) with water intake, these three openings of water outlet and discharge opening, 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 (7), and described passage I (7) is communicated with described control chamber (6) with described water intake,
It is characterized in that: described inlet valve comprises valve seat I (101), valve plate I (103), valve plate II (104), resetting means (105) and valve rod (106), one end of described valve rod (106) is successively through described resetting means (105), valve seat I (101), valve plate I (103) and valve plate II (104), described valve plate II (104) is fixedly connected with one end of described valve rod (106), described valve plate I (103) is flexibly connected with described valve rod (106), described resetting means (105) is connected with the valve seat I (101) being fixed on described housing, between described valve plate I (103) and described valve plate II (104), be connected by elastic device, also comprise the valve seat II (102) of ring-type, described valve seat II (102) is arranged at described valve seat I (101) the right, and be fixed in inner walls, described passage I (7) is positioned between described valve seat I (101) and valve seat II (102) at the opening of described water inlet,
Described valve plate I (103) is positioned at the right side of described valve seat I (101), and described valve plate I (103) can be blocked the blasthole of described valve seat I (101), the its right end face of described valve seat I (101) is provided with a circle projection I, in the time that described valve plate I (103) contacts with protruding I, can play sealing effect;
Described valve plate II (104) is positioned at the right side of described valve seat II (102), and described valve plate II (104) can be blocked the blasthole of described valve seat II (102), the its right end face of described valve seat II (102) is provided with a circle projection II, in the time that described valve plate II (104) contacts with protruding II, can play sealing effect.
2. backflow preventer according to claim 1, is characterized in that: between described valve plate I (103) and described valve plate II (104), be provided with locating stud, rotate each other avoiding.
3. backflow preventer according to claim 1 and 2, it is characterized in that: the elastic device between described valve plate I (103) and described valve plate II (104) is spring, the two ends of described spring lay respectively in the positioning hole that described valve plate I (103) and described valve plate II (104) be oppositely arranged.
4. backflow preventer according to claim 1 and 2, 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 (106), and one end of described spring props up described end cap, and the other end is fixed in described valve seat I (101).
5. backflow preventer according to claim 1 and 2, is characterized in that: between described valve plate I (103) and described valve rod (106), be provided with seal ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320780790.0U CN203604733U (en) | 2013-11-28 | 2013-11-28 | Backflow preventing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320780790.0U CN203604733U (en) | 2013-11-28 | 2013-11-28 | Backflow preventing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203604733U true CN203604733U (en) | 2014-05-21 |
Family
ID=50717408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320780790.0U Expired - Lifetime CN203604733U (en) | 2013-11-28 | 2013-11-28 | Backflow preventing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203604733U (en) |
-
2013
- 2013-11-28 CN CN201320780790.0U patent/CN203604733U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140521 |