CN211231721U - Backflow preventer with annular built-in drainer - Google Patents
Backflow preventer with annular built-in drainer Download PDFInfo
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- CN211231721U CN211231721U CN201922219000.1U CN201922219000U CN211231721U CN 211231721 U CN211231721 U CN 211231721U CN 201922219000 U CN201922219000 U CN 201922219000U CN 211231721 U CN211231721 U CN 211231721U
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Abstract
The utility model relates to a backflow preventer with an annular built-in drainer, which comprises a valve body, wherein a cylindrical drainage sealing piston, a water inlet valve clack and a water outlet valve clack are sequentially arranged inside the valve body along the direction from the water inlet to the water outlet from front to back; a pre-tightening spring is arranged between the drainage sealing piston and the front inner end face of the valve body, a main spring is arranged between the water outlet valve clack and the rear inner end face of the valve body, and water passing through holes are coaxially arranged in the middle parts of the drainage sealing piston and the water outlet valve clack; the water inlet valve clack coaxially penetrates through a guide sleeve in the valve body, the front end of the water inlet valve clack is provided with a limiting step, and the outer diameters of the front end and the rear end of the water inlet valve clack are larger than that of the water passing through hole for sliding and sealing the water passing through hole; the periphery of the guide sleeve is an annular valve channel, the periphery of the front end of the valve channel is an annular drainer channel and is separated by a cylindrical wall, and the periphery of the drainer channel is provided with a water discharge opening for closing when a water discharge sealing piston is moved backwards and abuts against the front end face of the cylindrical wall. The backflow preventer with the annular built-in drainer has a simple structure.
Description
Technical Field
The utility model relates to a backflow preventer with an annular built-in drainer.
Background
At the end of a tap water supply pipeline, a plurality of water taps, water using appliances such as a water heater, a washing machine and a toilet water tank are connected in the water pipeline of each family, when the water using appliances are closed, accumulated water still remains in the inner cavity and the pipeline of the water using appliances, if the water using appliances are not opened for a long time, the accumulated water can breed a large amount of bacteria, and if the water using appliances which do not meet the drinking water standard are used, rusty spot sewage can be generated. When the tap water pipe network in a certain area is in an abnormal state, for example, the water supply pipe is burst or the main water is closed, the accumulated water in the inner cavity of the tap and the inner cavity of other water using appliances can flow back into the drinking water pipe network of the area without any obstruction, so that the large-area pollution of the drinking water source of the area is caused, and the health of people is seriously damaged.
Because terminal pipeline pipe diameter is little, and general valve adopts threaded connection, generally adopts single check valve at present, or two-stage check valve prevents the water refluence, though the check valve prevents the water refluence to a certain extent, can't prevent the pollution of flowing water, because the check valve just can cause water pollution in the twinkling of an eye in the close time.
The backflow preventer is an effective device for preventing backflow pollution of water by supplying water to a pipeline. Due to space limitation, the traditional screw thread threaded connection backflow preventer adopts a diaphragm type drainer with a built-in diaphragm, but the diaphragm type drainer has short service life and is easy to damage, so that the drainer leaks water, and the valve leaks outside.
SUMMERY OF THE UTILITY MODEL
In view of the deficiencies of the prior art, the utility model aims to solve the technical problem that a backflow preventer of belt ring built-in drainer is provided, not only simple structure, convenient high efficiency moreover.
In order to solve the technical problem, the technical scheme of the utility model is that: a backflow preventer with an annular built-in drainer comprises a valve body, wherein a cylindrical drainage sealing piston, a water inlet valve clack and a water outlet valve clack are sequentially arranged inside the valve body from front to back along the direction from a water inlet to a water outlet;
a pre-tightening spring is arranged between the drainage sealing piston and the front inner end face of the valve body, a main spring is arranged between the water outlet valve clack and the rear inner end face of the valve body, and water passing through holes are coaxially arranged in the middle parts of the drainage sealing piston and the water outlet valve clack;
the water inlet valve clack coaxially penetrates through a guide sleeve in the valve body, the front end of the water inlet valve clack is provided with a limiting step, and the outer diameters of the front end and the rear end of the water inlet valve clack are larger than that of the water passing through hole for sliding and sealing the water passing through hole;
the periphery of the guide sleeve is an annular valve channel, the periphery of the front end of the valve channel is an annular drainer channel and is separated by a cylindrical wall, and the periphery of the drainer channel is provided with a water discharge opening for closing when a water discharge sealing piston is moved backwards and abuts against the front end face of the cylindrical wall.
Preferably, a filter screen is arranged in front of the water passing through hole of the drainage sealing piston, and a rubber lining sealing ring is arranged on the rear end face of the drainage sealing piston and is used for abutting against the front end of the water inlet valve clack to seal the water passing through hole.
Preferably, the rear end face of the water inlet valve clack is provided with a rubber lining sealing gasket for abutting against the front end of the water outlet valve clack to seal the water passing through hole of the water inlet valve clack.
Preferably, an O-shaped rubber sealing ring is arranged between the drainage sealing piston and the drainer channel.
Preferably, the drainage sealing piston is positioned in a drainer passage in the valve body, and the water inlet valve clack and the water outlet valve clack are positioned in a valve passage in the valve body.
Preferably, an O-shaped rubber sealing ring is arranged between the water outlet valve clack and the valve channel.
Preferably, the valve body comprises backflow preventer valve body and drainer valve body, and drainer valve body screw thread connects in the front end periphery of backflow preventer valve body soon, and the valve clack of intaking is located the inside valve passageway of backflow preventer valve body with the valve clack that goes out, and the sealed piston of drainage is located the drainer passageway of drainer valve body for the drum wall of separating valve passageway and drainer passageway is the front end of backflow preventer valve body.
Compared with the prior art, the utility model discloses following beneficial effect has:
and (3) normal water supply state: when the pressure of the water inlet is greater than that of the middle cavity and the pressure of the middle cavity is greater than that of the water outlet, the pressure pushes the drainage sealing piston to seal the built-in annular drainer, the drainage outlet is sealed, the water inlet valve flap moves backwards to limit, the water outlet valve flap moves backwards to limit, the two-stage check is in a fully open state, and the water medium flows from the water inlet to the middle cavity and flows to the water outlet to supply water normally.
The two-stage non-return sealing and drainer opening drainage state: when water inlet pressure reduces, delivery port pressure is greater than water inlet pressure, the play water valve clack removes to the water inlet direction under the main spring effect, it is sealed with the valve clack of intaking, simultaneously with the valve clack syntropy of intaking promote the sealed piston of drainage, the valve clack of intaking is sealed with the sealed piston of drainage, under export medium pressure promotes jointly with main spring force, provide sufficient sealed specific pressure, form effectual sealed with the disk seat, realize double sealing, prevent water refluence, the sealed piston of drainage leaves annular built-in drainer simultaneously, the outlet is opened, the water that will flow backwards in the twinkling of an eye is discharged from the outlet, flow out outside the valve.
The product has the advantages of partition safety, lower head loss, smaller volume, longer service life and larger built-in annular discharge capacity compared with a diaphragm type backflow preventer, and meets the use requirements of the terminal water supply backflow preventer.
Because the valve identification sealing force of the two non-return devices is realized by self-operated induction outlet pressure, the sealing force during non-return is greatly enhanced, and the sealing is reliable. Even if the two sealing pairs are damaged, the leakage amount is small, and the water is discharged by the drainer in time quickly, so that the safety of drinking water is ensured.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a configuration diagram illustrating a normal water supply state.
FIG. 2 is a schematic view of the configuration of the dual stage check seal, drainer open drain condition.
Fig. 3 is a sectional view a-a of fig. 2.
Detailed Description
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1-3, a backflow preventer with an annular built-in drainer comprises a valve body 1, wherein a cylindrical drainage sealing piston 4, a water inlet valve clack 5 and a water outlet valve clack 6 are sequentially arranged inside the valve body from front to back along the direction from a water inlet 2 to a water outlet 3;
a pre-tightening spring 7 is arranged between the drainage sealing piston and the front inner end face of the valve body, a main spring 8 is arranged between the water outlet valve clack and the rear inner end face of the valve body, and water passing through holes 9 are coaxially arranged in the middle parts of the drainage sealing piston and the water outlet valve clack;
the water inlet valve clack coaxially penetrates through a guide sleeve 10 in the valve body, a limiting step 11 is arranged at the front end of the water inlet valve clack, and the outer diameters of the front end and the rear end of the water inlet valve clack are larger than those of the water passing through hole for sliding and sealing the water passing through hole;
the periphery of the guide sleeve is a ring-shaped valve channel 12, the periphery of the guide sleeve is connected to the valve channel through spokes, the periphery of the front end of the valve channel is a ring-shaped drainer channel 13 and is divided by a cylinder wall 14, and the periphery of the drainer channel is provided with a water discharge opening 15 which is closed when a water discharge sealing piston is moved backwards and abutted against the front end face of the cylinder wall.
The embodiment of the utility model provides an in, the water through hole of drainage seal piston the place ahead is equipped with filter screen 16, and the rear end face of drainage seal piston is equipped with lining rubber sealing ring 17 for connect its water through hole of sealing with the front end top of the valve clack that intakes. The built-in filter screen is adopted to filter impurities in water, and the water can be automatically washed without disassembly.
The embodiment of the utility model provides an in, the rear end face of intaking valve clack is equipped with lining rubber sealing pad 18 for it crosses water through-hole to connect sealed with the front end top of going out the water valve clack.
In the embodiment of the present invention, an O-shaped rubber sealing ring 19 is disposed between the drainage sealing piston and the drainage channel.
The embodiment of the utility model provides an in, drainage seal piston is located the inside drainer passageway of valve body, and the valve clack of intaking is located the inside valve passageway of valve body with the valve clack of going out.
The embodiment of the utility model provides an in, be equipped with O type rubber seal between water valve clack and the valve passageway.
The embodiment of the utility model provides an in, the valve body comprises backflow preventer valve body 20 and drainer valve body 21, and drainer valve body screw thread connects in the front end periphery of backflow preventer valve body soon, and the valve clack of intaking is located the inside valve passageway of backflow preventer valve body with the valve clack that goes out, and the sealed piston of drainage is located the drainer passageway of drainer valve body inside for the drum wall of separating valve passageway and drainer passageway is the front end of backflow preventer valve body.
The specific implementation process comprises the following steps:
normal water supply state as shown in fig. 1: when the pressure of the water inlet is greater than that of the middle cavity, the pressure of the middle cavity is greater than that of the water outlet, the pressure pushes the drainage sealing piston to seal the built-in annular drainer, the drainage outlet is sealed, the water inlet valve clack moves backwards to limit, the limiting step is clamped on the guide sleeve, the water outlet valve clack moves backwards to limit, the two-stage non-return is in a fully open state, and water medium flows from the water inlet to the middle cavity and flows to the water outlet to supply water normally.
The two-stage check seal, drainer open drain condition as shown in fig. 2: when water inlet pressure reduces, delivery port pressure is greater than water inlet pressure, the play water valve clack removes to the water inlet direction under the main spring effect, it is sealed with the valve clack of intaking, simultaneously with the valve clack syntropy of intaking promote the sealed piston of drainage, the valve clack of intaking is sealed with the sealed piston of drainage, under export medium pressure promotes jointly with main spring force, provide sufficient sealed specific pressure, form effectual sealed with the disk seat, realize double sealing, prevent water refluence, the sealed piston of drainage leaves annular built-in drainer simultaneously, the outlet is opened, the water that will flow backwards in the twinkling of an eye is discharged from the outlet, flow out outside the valve.
The installation and maintenance are simple and convenient, and the installation can be carried out horizontally or vertically.
The present invention is not limited to the above preferred embodiments, and any person can obtain other types of backflow preventers with annular built-in drainers. All the equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (7)
1. The utility model provides a take backflow preventer of built-in drainer of annular which characterized in that: the water-saving valve comprises a valve body, wherein a cylindrical drainage sealing piston, a water inlet valve clack and a water outlet valve clack are sequentially arranged in the valve body from front to back along the direction from a water inlet to a water outlet;
a pre-tightening spring is arranged between the drainage sealing piston and the front inner end face of the valve body, a main spring is arranged between the water outlet valve clack and the rear inner end face of the valve body, and water passing through holes are coaxially arranged in the middle parts of the drainage sealing piston and the water outlet valve clack;
the water inlet valve clack coaxially penetrates through a guide sleeve in the valve body, the front end of the water inlet valve clack is provided with a limiting step, and the outer diameters of the front end and the rear end of the water inlet valve clack are larger than that of the water passing through hole for sliding and sealing the water passing through hole;
the periphery of the guide sleeve is an annular valve channel, the periphery of the front end of the valve channel is an annular drainer channel and is separated by a cylindrical wall, and the periphery of the drainer channel is provided with a water discharge opening for closing when a water discharge sealing piston is moved backwards and abuts against the front end face of the cylindrical wall.
2. A backflow preventer with an annular built-in drainer according to claim 1, wherein: the water passing through hole of the water discharging sealing piston is internally and forwardly provided with a filter screen, and the rear end face of the water discharging sealing piston is provided with a rubber lining sealing ring which is used for abutting against the front end of the water inlet valve clack to seal the water passing through hole.
3. A backflow preventer with an annular built-in drainer according to claim 1, wherein: the back end face of the water inlet valve clack is provided with a rubber lining sealing gasket for abutting against the front end of the water outlet valve clack to seal the water passing through hole of the water outlet valve clack.
4. A backflow preventer with an annular built-in drainer according to claim 1, wherein: an O-shaped rubber sealing ring is arranged between the drainage sealing piston and the drainer channel.
5. A backflow preventer with an annular built-in drainer according to claim 1, wherein: the drainage sealing piston is positioned in a drainer channel inside the valve body, and the water inlet valve clack and the water outlet valve clack are positioned in a valve channel inside the valve body.
6. A backflow preventer with an annular built-in drainer according to claim 5, wherein: an O-shaped rubber sealing ring is arranged between the water outlet valve clack and the valve channel.
7. A backflow preventer with an annular built-in drainer according to claim 1, wherein: the valve body comprises backflow preventer valve body and drainer valve body, and drainer valve body screw thread connects in the front end periphery of backflow preventer valve body soon, and the valve passageway inside the backflow preventer valve body is located with the play water valve clack to water inlet valve clack, and the sealed piston of drainage is located the drainer passageway of drainer valve body for the drum wall of separating valve passageway and drainer passageway is the front end of backflow preventer valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922219000.1U CN211231721U (en) | 2019-12-12 | 2019-12-12 | Backflow preventer with annular built-in drainer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922219000.1U CN211231721U (en) | 2019-12-12 | 2019-12-12 | Backflow preventer with annular built-in drainer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211231721U true CN211231721U (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922219000.1U Active CN211231721U (en) | 2019-12-12 | 2019-12-12 | Backflow preventer with annular built-in drainer |
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| Country | Link |
|---|---|
| CN (1) | CN211231721U (en) |
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2019
- 2019-12-12 CN CN201922219000.1U patent/CN211231721U/en active Active
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