CN201696681U - Low resistance self-discharging backflow preventer - Google Patents
Low resistance self-discharging backflow preventer Download PDFInfo
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- CN201696681U CN201696681U CN 201020199996 CN201020199996U CN201696681U CN 201696681 U CN201696681 U CN 201696681U CN 201020199996 CN201020199996 CN 201020199996 CN 201020199996 U CN201020199996 U CN 201020199996U CN 201696681 U CN201696681 U CN 201696681U
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Abstract
The utility model relates to the technical field of valves, in particular to a low resistance self-discharging backflow preventer which solves the problems of unstable movement, poor safety performance, large energy loss and complex structure of the existing backflow preventer, comprises a valve body and a valve cap arranged at a water inlet end of the valve body, and is characterized in that the middle of the valve body is provided with a water discharging opening; the valve body core part at the water discharging opening is provided with a sleeve; one end of the sleeve, towards the water inlet of the valve body, is provided with a round edge and a spring seat; a third spring is arranged between the external diameter of the sleeve and the inner diameter of the valve body; the valve cap core part is provided with a first check valve; one end of the first check valve is matched with the sleeve; one end of the sleeve, towards the water outlet of the valve body, is provided with a second check valve; the second check valve comprises a slide valve provided with four claws; and the matching part of the slide valve and the sleeve is the width of the four claws. The backflow preventer has the advantages of high partition safety and small head loss when the medium passes through the preventer, and can effectively prevent backflow pollution.
Description
Technical field
The utility model relates to valve technology field, and the low-resistance self-discharge backflow preventer that refluxes takes place especially a kind of pipeline liquid that prevents.
Background technique
Backflow preventer claims dirty stream isolating valve again, is a kind of sewage pollution watering water quality when preventing that the Drinking Water pipeline from taking place to reflux, and also is applicable to the pipeline place that physics, chemical aspect do not allow medium to flow backwards.Existing backflow preventer mainly contains two kinds of patterns, and a kind of is to be in series by two safety check, simple in structure, flow resistance is little, and price is low, and shortcoming is when two check valve seal are destroyed simultaneously, just lost the non-return effect, Security is relatively poor, only is used for cutting off less demanding occasion; Another kind is made up of the middle atria of two safety check that separate and one band decompression, function admirable, reliable operation, shortcoming be medium when passing through loss of head bigger, reach 7～9 meter water columns (flow velocity 3m/s), complex structure in addition, troublesome maintenance, cost is higher.And 201,382,158 1 kinds of sewage backflow preventers of Chinese patent publication number, two annulus of ring and following ring in pipe, being equipped with, last ring links into an integrated entity by being actiniform three axles and columnar valve cylinder respectively with following ring, the valve shaft string is contained in the valve cylinder, screw valve shaft the higher authorities by bolt and pad, valve shaft is fixed, valve shaft can move up and down in valve cylinder, in the lower end of valve shaft valve body and seal rubber pad are housed, the diameter of last ring and following annular distance is less than the diameter of seal rubber pad, the lift that makes progress by water promotes valve body to move greater than the gravity of valve shaft self, valve body and seal rubber pad are near on the following ring in the pipe, because the diameter of seal rubber pad greater than the diameter of following annular distance, relies on the seal rubber pad effect with pipe sealing, make sewage again can not on gush, just can guarantee that sewage can not flow backwards again.This device is used for bigger valve body occasion, and structure is also different fully with structure of the present utility model.
Summary of the invention
The purpose of this utility model is unstable in order to solve existing backflow preventer operation action, poor safety performance, big, the baroque problem of energy loss, a kind of low-resistance self-discharge backflow preventer is provided, utilizes the waterpower control principle, be provided with one-way valve respectively at the water intake and the water outlet place of valve body, and in the combination that the valve body medium position is provided with sleeve and the one-way valve sluicing that refluxes, safe, flow resistance is little, and the loss of head when medium passes through is 2～3 meter water columns (flow velocity 3m/s) only.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of low-resistance self-discharge backflow preventer, comprise valve body, be arranged on the valve gap of water intake one end of valve body, it is characterized in that described valve body middle part is provided with discharge opening, valve body core at the discharge opening position is provided with sleeve, sleeve is provided with annular sword limit and spring seat towards an end of valve inleting water mouth, described annular sword limit is the termination, narrow limit that forms after the inside and outside chamfering of sleeve ends round tube wall, be provided with the 3rd spring between the internal diameter of sleeve outer diameter and valve body, be provided with first one-way valve in the valve gap, first one-way valve is provided with the diaphragm that cooperates with sleeve annular sword limit, sleeve is provided with second one-way valve towards an end of valve body water outlet, second one-way valve comprises the guiding valve that is provided with four paws, and the width that guiding valve cooperates with sleeve is the width of claw type.
First one-way valve is as inlet check valve, and second one-way valve is as outlet non-return valve because the rigidity of first spring and second spring is less, so medium during by valve body loss of head little; Guiding valve is made the four paws shape, with an end endoporus of sleeve water outlet cooperate the only width of four pawls of width, so after outlet non-return valve opened, circulation area was big, flow resistance is little, thereby has reduced the flow resistance of medium by outlet non-return valve; The hollow space of valve body becomes the sluicing chamber, and the hollow space of sleeve becomes intermediate cavity, and sleeve is provided with certain width and annular sword limit highly towards water intake one end, and when the sword limit closely contacted with diaphragm, intermediate cavity and sluicing chamber were just isolated.
Spring seat is mainly used to protect diaphragm; during normal water supply; because the effect of water intake hydraulic pressure; spring seat is positioned on the shaft shoulder of sleeve annular sword limit end; the inclined-plane that spring seat is provided with fits tightly with the inclined-plane of diaphragm all the time; hydraulic pressure at water intake fluctuates, and when especially hydraulic pressure raises suddenly, can effectively prevent the damage of diaphragm.The effect of the 3rd spring is to guarantee spring seat with motion of membrane, and its rigidity is very little, can not influence the performance of backflow preventer.
During normal water supply, because the local head loss of first one-way valve, the hydraulic pressure of the intermediate cavity of sleeve is lower than water intake hydraulic pressure all the time, and this pressure reduction overcomes the pressure of first spring on the one hand, first one-way valve is opened, diaphragm is closely contacted with the annular sword limit of sleeve.When certain reason occurring, when the intermediate cavity pressure of sleeve was increased to certain value, first closed check valve on the one hand promoted diaphragm and leave the annular sword limit of sleeve to the water intake direction on the other hand, the intermediate cavity of sleeve and sluicing chamber communicate, and the water of refluence is by the spilled water hole emptying in sluicing chamber.
As preferably, first one-way valve of described valve gap core comprises first valve rod, supporting plate, and first valve rod is provided with the diameter of first diaphragm seal and pressing plate one, the first diaphragm seal and pressing plate one less than the internal diameter of sleeve in this end cooperation place towards an end of sleeve; First valve rod passes supporting plate and is provided with first spring at the end towards the valve inleting water mouth, and supporting plate is provided with diaphragm towards an end of first diaphragm seal, and an end of diaphragm is provided with the end face greater than sleeve ends annular sword limit external diameter, fits in this end face and annular sword limit.Pressing plate one is fixed on the first valve rod end to first diaphragm seal, and when water inlet, first spring is compressed, the intermediate cavity of media such as water from entering sleeve between first diaphragm seal and the diaphragm, and first valve rod is provided with the shaft shoulder of retaining spring in the end termination that spring is housed.Annular sword limit has the less smooth planar annular of a width, the plane applying that this plane is bigger than sleeve ends external diameter with membrane ends.
As preferably, described supporting plate contacts with the position, circumference outer ring of diaphragm, and is pressed on by valve gap in the end endoporus seat of valve body.This is a kind of fit of supporting plate and diaphragm, and diaphragm becomes the cone shape of hollow, has elasticity, and the cone small end contacts with first diaphragm seal.
As preferably, described second one-way valve comprises second valve rod, guiding valve is arranged on the end of second valve rod towards the valve inleting water mouth, the internal diameter Spielpassung of the external diameter of guiding valve four paws and sleeve one end, guiding valve is provided with second diaphragm seal and the pressing plate two that is fixed on second valve rod towards an end of valve body water outlet, the diameter of second diaphragm seal and pressing plate two is greater than the sleeve internal diameter of cooperative end part herein, and sleeve also is provided with annular sword limit at this end, and second spring is housed on second valve rod.Guiding valve moves in the endoporus of valve body during work; During closed condition, second spring flicks naturally, and second diaphragm seal and pressing plate two tightly are pressed on the annular sword limit of sleeve ends, and second valve rod is provided with the pillow block rank of location at installation second diaphragm seal and pressing plate three places, and second diaphragm seal is close to guiding valve.
As preferably, described sleeve is provided with tripod towards an end of valve body water outlet, the internal diameter transition fit of the external diameter of tripod and valve body, tripod is provided with the hole greater than second stem diameter towards an end center of valve body water outlet, second valve rod stretches out from this hole, and second spring is arranged between this hole and the pressing plate two.Tripod carries out axially locating to sleeve, and second valve rod slides in the hole at tripod center during work, installs a back-up ring additional between second spring and the tripod inboard, and second valve rod is provided with the positioning shaft step at dress pressing plate place, also is the positioning seat of spring one end.
As preferably, described valve inleting water mouth one end is provided with interior threaded hole, water outlet one end of valve body is provided with outside thread, interior threaded hole cooperates with valve gap, the outside thread place is provided with nut, the water outlet place of valve body is provided with water output connector, is provided with seal ring between water output connector and the valve body, and tripod is fixed in the endoporus of valve body by nut by water output connector, seal ring.Water output connector is designed to the standard universal parts, to be fit to various places.
As preferably, described valve gap inside is provided with filter screen at first one-way valve towards water intake one end, and valve gap is provided with water supply connector towards water intake one end, and the end of valve gap is fixed together water supply connector and valve gap by the tight nut of abandoning.Filter screen enters water quality in the valve body in order to raising, is provided with seal ring between each tubular connection.
As preferably, described the 3rd spring is arranged in the containing space between sleeve outer surface and the valve block internal diameter, and is located by spring seat.This containing space is the sluicing chamber of sleeve.
The beneficial effects of the utility model are: cut off safe, loss of head was little when medium passed through to flow backwards this device, solved the technical bottleneck that the backflow preventer product " cuts off the contradiction between Security and the resistance performance ", even all destroyeds of the sealing of two safety check, also can effectively prevent to flow backwards and pollute, there is no siphon refluence phenomenon.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
Among the figure: 1. filter screen, 2. valve gap, 3. first spring, 4. first valve rod, 5. supporting plate, 6. diaphragm, 7. first diaphragm seal, 8. pressing plate one, 9. spring seat, 10. the 3rd spring, 11. sleeves, 12. guiding valves, 13. valve body, 14. second diaphragm seals, 15. pressing plates, two, 16. second valve rods, 17. second spring, 18. tripods, 19. back-up rings, 20. seal ring, 21. joints, 22. nuts.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Referring to Fig. 1, a kind of low-resistance self-discharge backflow preventer of present embodiment, an if valve body 13, water intake one end of valve body 13 is a valve gap 2, and the other end straight-through with water intake is water outlet, establishes a discharge opening at valve body 13 middle parts and intake-outlet Vertical direction, valve body 13 cores at discharge opening position are established a sleeve 11, the hollow space of sleeve 11 becomes intermediate cavity, and sleeve 11 right-hand members are that inlet end is provided with width and is 0.5mm, highly is the annular sword limit of 1.5mm that the sleeve left end also is provided with annular sword limit.
Valve gap 2 cores are provided with first one-way valve, and the end that first one-way valve is provided with first valve rod, 4, the first valve rods 4 is provided with first diaphragm seal 7, first diaphragm seal 7 is fixed on the end of first valve rod 4 by pressing plate 1.The diameter of first diaphragm seal 7 and pressing plate 1 is less than the internal diameter of this end sleeve 11; First valve rod 4 passes supporting plate 5, and is provided with first spring, 3, the first valve rods 4 at the end towards valve body 13 water intakes and is provided with shaft shoulder seat in the end of first spring 3, is used for locating first spring.Supporting plate 5 is provided with the diaphragm 6 of conical shell shape towards an end of first diaphragm seal 7, and the conical shell shape small end of diaphragm 6 is provided with the plane of external diameter greater than the radial arrangement on annular sword limit, sleeve 11 ends, and this plane always is close to not producing when refluxing with annular sword limit.Supporting plate 5 is designed to same size with the circular outer ring of the big end of diaphragm 6 conical shell shapes, and when screwing in valve bodies by valve gap 2, supporting plate 5 and diaphragm 6 is pressed in the end endoporus seat of valve body 13, and is provided with seal ring.Valve gap 2 cores are adorned a filter screen 1 at first one-way valve towards water intake one end.
Below to be illustrated under several operating modes:
During normal water supply, the medium that flows overcomes first spring 3, the pressure of second spring 17, water intake first one-way valve and water outlet second one-way valve are all opened, simultaneously since water intake hydraulic pressure greater than intermediate cavity hydraulic pressure, diaphragm 6 closely contacts with the annular sword limit of sleeve 11, and intermediate cavity and sluicing chamber cut off, and hydathode cuts out.
If import hydraulic pressure descends, when pressure reduction drops to certain value before and after water intake first one-way valve, first spring 3 promotes films 6 and moves and break away from the annular sword limit of sleeve 11 to the water intake direction, intermediate cavity communicates with the sluicing chamber, hydathode draining pressure release, when pressure release pressure reduction before and after the inlet check valve returned to certain difference, hydathode cut out again automatically.
When water intake hydraulic pressure was reduced to zero or negative pressure, hydathode was opened fully, and air enters intermediate cavity from discharge opening, formed air and cut off, and had prevented siphon refluence phenomenon.
Pipeline no user behind the valve of this device, water is static, only needs import hydraulic pressure constant, promptly has certain pressure reduction before and after water intake first one-way valve, and hydathode cuts out, but when water intake hydraulic pressure dropped near zero or negative pressure, hydathode was opened.
Ductwork pressure behind the valve of this device raises, and during above the intermediate cavity hydraulic pressure before water outlet second one-way valve, if the water outlet second one-way valve good seal, high pressure water can not flow backwards, and hydathode cuts out, not pressure release; If producing, the second one-way valve seal break-off leaks, intermediate cavity hydraulic pressure raises, when being lower than certain value with the water intake differential water pressures, diaphragm 6 moves the annular sword limit that breaks away from sleeve 11 to the water intake direction, hydathode is opened, the draining pressure release, and simultaneously a large amount of air enter intermediate cavity from discharge opening, the formation air cuts off, and stops medium and flows backwards.If this moment, the sealing of water intake first one-way valve destroyed simultaneously, because the high pressure water pressure release that water outlet is refunded, and intermediate cavity formed air and cut off, so can not blow back into water intake.
From above analysis as can be known, this backflow preventer is no matter under which kind of operating mode, even all destroyeds of the sealing of two safety check also can effectively prevent the danger of flowing backwards and polluting.
The foregoing description is to explanation of the present utility model, is not to qualification of the present utility model, any structure after the simple transformation of the present utility model is all belonged to protection domain of the present utility model.
Claims (8)
1. low-resistance self-discharge backflow preventer, comprise valve body (13), be arranged on the valve gap (2) of valve body (13) water intake one end, it is characterized in that described valve body (13) middle part is provided with discharge opening, valve body (13) core at the discharge opening position is provided with sleeve (11), sleeve (11) is provided with annular sword limit and spring seat (9) towards an end of valve inleting water mouth, described annular sword limit is the termination, narrow limit that forms after the inside and outside chamfering of sleeve (11) end round tube wall, be provided with the 3rd spring (10) between the internal diameter of the external diameter of sleeve (11) and valve body (13), valve gap is provided with first one-way valve in (2), first one-way valve is provided with the diaphragm (6) that cooperates with the annular sword of sleeve (11) limit, sleeve (11) is provided with second one-way valve towards an end of valve body water outlet, second one-way valve comprises the guiding valve (12) that is provided with four paws, and guiding valve (12) is the width of claw type with the width that cooperates of sleeve (11).
2. low-resistance self-discharge backflow preventer according to claim 1, it is characterized in that described first one-way valve comprises first valve rod (4), supporting plate (5), first valve rod (4) is provided with first diaphragm seal (7) and pressing plate one (8) towards an end of sleeve, and the diameter of first diaphragm seal (7) and pressing plate one (8) is less than the internal diameter of sleeve (11) in this end cooperation place; First valve rod (4) passes supporting plate (5) and is provided with first spring (3) at the end towards valve body (13) water intake, supporting plate (5) is installed diaphragm (6) towards an end of first diaphragm seal (7), one end of diaphragm (6) is provided with the end face greater than annular sword limit, sleeve (11) end external diameter, fits in this end face and annular sword limit.
3. low-resistance self-discharge backflow preventer according to claim 2 is characterized in that described supporting plate (5) contacts with the position, circumference outer ring of diaphragm (6), and is pressed on by valve gap (2) in the end endoporus seat of valve body (13).
4. low-resistance self-discharge backflow preventer according to claim 1, it is characterized in that described second one-way valve comprises second valve rod (16), guiding valve (12) is arranged on the end of second valve rod (16) towards valve body (13) water intake, the internal diameter Spielpassung of the external diameter of guiding valve (12) four paws and sleeve (11) one ends, guiding valve (12) is provided with second diaphragm seal (14) and the pressing plate two (15) that is fixed on second valve rod (16) towards an end of valve body (13) water outlet, the diameter of second diaphragm seal (14) and pressing plate two (15) is equipped with second spring (17) greater than sleeve (11) internal diameter of cooperative end part herein on second valve rod (16).
5. according to claim 1 or 2 or 4 described low-resistance self-discharge backflow preventers, it is characterized in that described sleeve (11) is provided with tripod (18) towards an end of valve body (13) water outlet, the internal diameter transition fit of the external diameter of tripod (18) and valve body (13), tripod (18) is provided with the hole greater than second valve rod (16) diameter towards an end center of valve body water outlet, second valve rod (16) stretches out from this hole, and second spring (17) is arranged between this hole and the pressing plate two (15).
6. according to claim 1 or 2 or 3 or 4 described low-resistance self-discharge backflow preventers, it is characterized in that described valve body (13) water intake one end is provided with interior threaded hole, water outlet one end of valve body (13) is provided with outside thread, interior threaded hole cooperates with valve gap (2), the outside thread place is provided with nut (22), the water outlet place of valve body (13) is provided with joint (21), be provided with seal ring (20) between joint (21) and the valve body (13), tripod (18) is fixed in the endoporus of valve body (13) by nut (22) by joint (21), seal ring (20).
7. according to claim 1 or 2 or 3 described low-resistance self-discharge backflow preventers, it is characterized in that described valve gap (2) inside is provided with filter screen (1) at first one-way valve towards water intake one end, valve gap (2) is provided with water supply connector towards water intake one end, and the end of valve gap (2) is fixed together water supply connector and valve gap by the tight nut of abandoning.
8. low-resistance self-discharge backflow preventer according to claim 1 is characterized in that described the 3rd spring (10) is arranged in the containing space between sleeve (11) outer surface and valve body (13) internal diameter, and is located by spring seat (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020199996 CN201696681U (en) | 2010-05-24 | 2010-05-24 | Low resistance self-discharging backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020199996 CN201696681U (en) | 2010-05-24 | 2010-05-24 | Low resistance self-discharging backflow preventer |
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| Publication Number | Publication Date |
|---|---|
| CN201696681U true CN201696681U (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020199996 Expired - Fee Related CN201696681U (en) | 2010-05-24 | 2010-05-24 | Low resistance self-discharging backflow preventer |
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| CN (1) | CN201696681U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852302A (en) * | 2010-05-24 | 2010-10-06 | 杭州春江阀门有限公司 | Low-resistance self-discharge backflow preventer |
| CN102322541A (en) * | 2011-09-02 | 2012-01-18 | 陈银周 | Low-resistance backflow preventer |
-
2010
- 2010-05-24 CN CN 201020199996 patent/CN201696681U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852302A (en) * | 2010-05-24 | 2010-10-06 | 杭州春江阀门有限公司 | Low-resistance self-discharge backflow preventer |
| CN101852302B (en) * | 2010-05-24 | 2011-08-31 | 杭州春江阀门有限公司 | Low-resistance self-discharge backflow preventer |
| CN102322541A (en) * | 2011-09-02 | 2012-01-18 | 陈银周 | Low-resistance backflow preventer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20180524 |