CN102322541A - Low-resistance backflow preventer - Google Patents
Low-resistance backflow preventer Download PDFInfo
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- CN102322541A CN102322541A CN201110258104A CN201110258104A CN102322541A CN 102322541 A CN102322541 A CN 102322541A CN 201110258104 A CN201110258104 A CN 201110258104A CN 201110258104 A CN201110258104 A CN 201110258104A CN 102322541 A CN102322541 A CN 102322541A
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Abstract
The invention discloses a low-resistance backflow preventer, comprising a valve body provided with a water inlet and a water outlet, wherein a middle pressure reduction cavity is arranged in the middle of the inner cavity of the valve body and is connected or disconnected with the water inlet and the water outlet via upstream and downstream valve clack devices controlled by an evenly-compressed spring; a drain valve is also arranged on the valve body and provided with a first water intake, a second water intake and a discharge opening; the first water intake is communicated with the middle pressure reduction cavity; the second water intake is communicated with the water inlet; and the first water intake is separated from the second water intake via an elastic diaphragm device. According to the invention, the upstream valve clack device and the downstream valve clack device are started by the evenly-compressed spring, then further compression of the evenly-compressed spring can be maintained only by overcoming the initial elastic force of the evenly-compressed spring instead of losing extra pressure so that the purpose of saving water and energy sources is achieved; and meanwhile, the backflow of toxic liquid and polluted liquid is effectively stopped through a pressure reduction principle so that the purpose of safe water use is achieved.
Description
Technical field
The present invention relates to valve, be specifically related to low resistance force counter flow stop.
Background technique
The non-fluid piping of drinking is connected with the illegal waterpower of potable water piping; Be called " interconnection " by the feedwater worker; This illegal " interconnection " will flow backwards to the potable water piping owing to potential backsiphonage or back pressure accident cause the non-fluid of drinking, thus the harm water safety.This harm is divided into: poisonous pollution---and possibly cause life death or large size to propagate the diffusion pandemic, the harmful pollution---possibly damage human body or biological healthy, slight pollution---cause feeling sick, be sick of or stimulus to the sense organ.
In daily life, interconnection exists everywhere, and is difficult to avoid fully; For example, in family's supply and drain water system, the intake pipe of the domestic water in kitchen and toilet water closet all can be connected on the inlet pipeline; Like this, if siphon backflow or back pressure appear in the water in the toilet water closet when being back in the intake pipe, will pollute domestic water; Therefore, in order to ensure the safety of domestic water, necessary back-flow preventer (backflow preventer) must be installed.
Way in the past all is to adopt safety check to replace backflow preventer; But,, produce siphon backflow and back pressure backflow phenomenon through regular meeting because there is the slow excessively shortcoming of closing velocity in safety check; In addition; Safety check has existence to be not closed completely even cuts out malfunctioning situation, in case take place, does not then have the effect of anti-backflow.These years, though some valve producers have developed backflow preventer, all exist otherwise hydraulic losses excessive, or closed slow and caused the disadvantage of backflow.
Summary of the invention
Technical problem to be solved by this invention is that to solve the backflow preventer hydraulic losses excessive or closed slow problem.
In order to solve the problems of the technologies described above, the technological scheme that the present invention adopted provides a kind of low resistance force counter flow stop, comprises valve body; The left and right two ends of said valve body are respectively equipped with water intake, water outlet; Be provided with the intermediate relief chamber in the middle part of the inner chamber of valve body, said intermediate relief chamber realizes and the break-make of said water intake that through upper reaches Valve clack device said intermediate relief chamber is through the break-make of Valve clack device realization in downstream with said water outlet; Said upper reaches Valve clack device and said downstream Valve clack device are opened by equal pressing spring control; Also be provided with drain valve on the said valve body, said drain valve has first, second water inlet, discharge opening and suction port, and said first water inlet is communicated with said intermediate relief chamber; Said second water inlet is communicated with said water intake through conduit; Said first water inlet and second water inlet are separated through the elastic diaphragm device, and said elastic diaphragm device is opened during greater than the second water inlet pressure at the first water inlet pressure, is communicated with said first water inlet and said discharge opening; Said suction port is arranged on the valve body top of said drain valve, is communicated with ambient atmosphere.
In such scheme; Said drain valve comprises that drain valve valve body and spiral shell are contained at the bottom of the drain valve valve on the drain valve valve body bottom surface; Said first water inlet is arranged on the end face center of said drain valve valve body; Said second water inlet is arranged on the bottom center place at the bottom of the said drain valve valve, and said discharge opening is made up of a plurality of through holes on being arranged at the bottom of the said drain valve valve, and a plurality of said through hole is uniformly distributed with setting around said second water inlet; Said elastic diaphragm device comprises barrier film and drain valve spring; End face at the bottom of the said drain valve valve is provided with first annular groove; Said barrier film is the cylindric and opening end that Open Side Down and is slidingly arranged in said first annular groove; The upper end of said drain valve spring is fixed on the inwall of said first water inlet, and the end face of lower end and said barrier film offsets.
In such scheme; Said annular groove internal fixation is provided with the barrier film fixed base; Said barrier film fixed base is ring, and inwall extends upward the formation extension part, and the opening end of said barrier film is slidingly arranged in the gap between said extension part and the said annular groove madial wall.
In such scheme; Said upper reaches Valve clack device comprises upper reaches flap fitting seat and upper reaches flap and the upper reaches flap spring that is fixed on the said valve interior wall; Said upper reaches flap fitting seat is the bar shaped sheet and the middle part is provided with protruding in right-hand pit; The right flank of pit is provided with at least two axially directed holes, and the right side of said upper reaches flap is provided with and the suitable directional post in axially directed hole, and directional post is inserted in the axially directed hole; Said upper reaches flap spring is equal pressing spring, flexibly is arranged between upper reaches flap fitting seat and the upper reaches flap.
In such scheme, the middle part of said upper reaches flap fitting seat is provided with to the right the pit of protrusion, and the right-hand member of said upper reaches flap spring is fixedly installed in the said pit and left end and said upper reaches flap offset.
In such scheme; Said downstream Valve clack device comprises downstream flap seat and downstream flap and the downstream flap spring on the inwall that is fixed on said valve body; Said downstream flap seat ringwise, the outlet end center of said valve body is provided with downstream flap fitting seat, downstream flap fitting seat is the round barrel shape of opening towards entrance point; Its outer peripheral surface is connected with the inwall of valve body through at least two connecting tendons; Annular space between the side of connecting tendon and the downstream flap fitting seat outer peripheral surface forms water outlet, and the wall portion of downstream flap fitting seat is provided with two axially directed holes, and the right side of said downstream flap is provided with and the suitable directional post in said axially directed hole; Said directional post is inserted in the said axially directed hole; Said downstream flap spring is equal pressing spring, and an end is arranged in the said pit, and the other end is resisted against on the right side of said downstream flap.
In such scheme, the center, left side of said upper reaches flap and said downstream flap is respectively equipped with the boss of protrusion left, is respectively equipped with upstream valve flap seal pad and downstream valve flap seal pad around boss.
In such scheme, said equal pressing spring comprises fixed plate and is arranged on the arc spring lamination on the said fixed plate that the right side of said fixed plate is provided with two and is used for the fixing claw of plug-in mounting.
In such scheme, be respectively equipped with the flap bearing on the right side of said upper reaches flap and said downstream flap, the free end of said arc spring lamination is resisted against on the outer peripheral surface of said flap bearing.
The present invention; The inner chamber of valve body is separated the intermediate relief chamber by upper reaches Valve clack device and downstream Valve clack device, and the intermediate relief chamber is communicated with drain valve, and upper reaches Valve clack device and downstream Valve clack device are controlled unlatching by equal pressing spring; Realized lower resistance; And adopt the decompression principle, the backflow of stopping toxic liquid and contaminated liquid effectively reaches the purpose of safe water.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of drain valve among the present invention;
Fig. 3 is the structural representation of middle and upper reaches flap fitting seat of the present invention;
Fig. 4 is the left view of Fig. 3;
Fig. 5 is the structural representation of middle and upper reaches flap of the present invention;
Fig. 6 is the structural representation of middle and upper reaches flap spring of the present invention;
Fig. 7 is the left view of Fig. 6;
Fig. 8 is the structural representation of valve body among the present invention;
Fig. 9 is the A-A sectional view among Fig. 8;
Figure 10 is the stress deformation schematic representation of upper reaches flap spring.
Embodiment
Below in conjunction with Figure of description and a kind of specific embodiment the present invention is elaborated.
As shown in Figure 1; Low resistance force counter flow stop comprises valve body 1 and the valve gap 2 of spiral-lock on valve body 1 end face; The left and right end of valve body 1 is respectively equipped with water intake 76, water outlet 77; Water intake 76 is connected with city planting ductwork through pipeline adpting flange or screw thread screw thread, and water outlet 77 is connected with user's pipeline through pipeline adpting flange or screw thread screw thread.
Be provided with intermediate relief chamber 19 in the inner chamber of valve body 1, intermediate relief chamber 19 is through the break-make of Valve clack device realization in the upper reaches with water intake 76, through the break-make of Valve clack device realization in downstream with water outlet 77.
Also be provided with drain valve 79 on the valve body 1, the structure of drain valve 79 is as shown in Figure 2, comprises at the bottom of drain valve valve body 13 and the drain valve valve 15.Drain valve valve body 13 is the uncovered round barrel shape in lower end, and upper end snail is contained on the bottom surface of valve body 1, and the end face center of drain valve valve body 13 is provided with first water inlet 131; 15 is in the form of annular discs at the bottom of the drain valve valve, and spiral shell is contained in the lower ending opening place of drain valve valve body 13, and 15 bottom center place is provided with second water inlet 132 at the bottom of the drain valve valve, and be provided with the discharge opening of being made up of a plurality of through holes 64 around second water inlet 132 on 15 at the bottom of the drain valve valve.First water inlet 131 is communicated with intermediate relief chamber 19; Second water inlet 132 is communicated with water intake 76 through conduit 12; First water inlet 131 and second water inlet 132 are separated through the elastic diaphragm device, and the elastic diaphragm device is opened during greater than the pressure of second water inlet 132 at the pressure of first water inlet 131, and intermediate relief chamber 19 is communicated with discharge opening 64; Water in the intermediate relief chamber 19 is discharged; The side wall upper part of drain valve valve body 13 is provided with suction port 57, when the water in the middle relief chamber 19 is discharged, sucks air.
Again referring to Fig. 1 and Fig. 2; The elastic diaphragm device comprises barrier film 16 and drain valve spring 14; Be provided with first annular groove around second water inlet 132 on 15 the end face at the bottom of the drain valve valve; Barrier film 16 is round barrel shape and the opening end that Open Side Down and is slidingly arranged in first annular groove, and the upper end of drain valve spring 14 is fixed on the inwall of first water inlet 131, and the end face of lower end and barrier film 16 offsets.The means of fixation of drain valve spring 14 upper ends is following: first water inlet 131 is up-small and down-big step hole, and step surface is provided with second annular groove, and the upper end plug-in mounting of drain valve spring 14 is fixed in second annular groove.
The processing of barrier film 16 and replacing for ease; In first annular groove, be set with barrier film fixed base 17 through screw 172; Barrier film fixed base 17 is ring; And inwall extends upward and forms extension part 171, and the opening end of barrier film 16 is slidingly arranged in the gap between the extension part 171 and the first annular groove madial wall, and is as shown in Figure 2.
Referring to Fig. 3, Fig. 4 and Fig. 5, upper reaches Valve clack device comprises upper reaches flap fitting seat 3 and the upper reaches flap 5 and upper reaches flap spring 4 on the inwall that is fixed on valve body 1 again.Upper reaches flap fitting seat 3 is the bar shaped sheet and the middle part is provided with protruding in right-hand pit 52; The left surface of pit 52 is provided with at least two axially directed holes 51, and the right side of upper reaches flap 5 is provided with the directional post 71 suitable with axially directed hole 51, and directional post 71 is inserted in the axially directed hole 51; And can about move freely; The center of upper reaches flap 5 left sides is provided with the boss 72 of protrusion left, is provided with upstream valve flap seal pad 6 around boss 72, and this design can guarantee better sealing.Upper reaches flap spring 4 is equal pressing spring, flexibly is arranged between upper reaches flap fitting seat 3 and the upper reaches flap 5.
The structure of upper reaches flap spring 4 such as Fig. 6, shown in Figure 7; Comprise fixed plate 45 and be arranged on the arc spring lamination 44 on the fixed plate 45; The right side of fixed plate 45 is provided with two claws 46; Two claw 46 plug-in mountings are fixed on the right flank of pit 52 upper reaches flap spring 4 is fixing, and the right side of the free end of arc spring lamination 44 and upper reaches flap 5 offsets.
The downstream Valve clack device comprises downstream flap seat 7 and the downstream flap 9 and downstream flap spring 10 on the inwall that is fixed on valve body 1, downstream flap seat 7 be ring and and the inwall of valve body 1 between be provided with seal ring 8.
Like Fig. 8, shown in Figure 9; The center of the right-hand member of valve body 1 has downstream flap fitting seat 18; Downstream flap fitting seat 18 is opening round barrel shape left; Its outer peripheral surface is connected with the inwall of valve body 1 through at least two connecting tendons 22, and the annular space 23 between the side of connecting tendon 22 and downstream flap fitting seat 18 outer peripheral surfaces forms water outlet 77.
The wall portion of downstream flap fitting seat 18 is provided with two axially directed holes 25, and the right side of downstream flap 9 is provided with the directional post suitable with axially directed hole 25, directional post be inserted in the axially directed hole 25 and can about move freely.Downstream flap 9 and upper reaches flap 5 structural similarities are provided with the boss and the downstream valve flap seal pad 93 of protrusion left equally, concrete structure and act on this and repeat no more.
In order to prevent that the upper reaches flap 5 from blocking stifled with downstream flap 9 unbalance stress; Be respectively equipped with flap bearing 94 on the right side of upper reaches flap 5 and downstream flap 9; The free end of arc spring lamination 44 is resisted against on the outer peripheral surface of flap bearing 94; Like this, upper reaches flap 5 and downstream flap 9 all the time with equal pressing spring receive force direction vertical.
Below in conjunction with Fig. 1 to working principle explanation of the present invention as follows, the direction of arrow is water (flow) direction among the figure:
(1) water in the city planting ductwork is acted on the left surface of upper reaches flap 5 by water intake 76; Open upper reaches flap 5 after overcoming the elastic force of upper reaches flap spring 4; Press water gets in the intermediate relief chamber 19 after being deducted partial pressure by upper reaches flap 5, and simultaneously, press water is also through in the pressure chamber 74 in conduit 12, second water inlet, the 132 entering drain valves 79; Because the pressure (being equal to the pressure of water intake 76) in the pressure chamber 74 is greater than the pressure in the intermediate relief chamber 19; So form a hydraulic pressuring difference at the upper and lower surfaces of barrier film 16, and this hydraulic pressuring difference overcome the elastic force of drain valve spring 14 fully, made drain valve 79 be in closed condition.
Unceasingly, the press waters in the intermediate relief chamber 19 are opened downstream flap 9 after further overcoming the elastic force of downstream flap spring 10, and press water is flowed out by water outlet 77 after being deducted partial pressure once more by downstream flap 9.
(2) in case the hydraulic pressure at water outlet 77 places increase, near or surpass the hydraulic pressure in the intermediate relief chamber 19, at this moment; If downstream flap 9 is stifled by card, reflux just can produce back pressure, the pressure in the intermediate relief chamber 19 increases because of back pressure refluxes; The hydraulic pressuring difference of barrier film about in the of 16 reduces, and drain valve spring 14 is pushed barrier film 16 downwards open, and drain valve 79 is opened; Press water in the intermediate relief chamber 19 is discharged by discharge opening 64; Air is got in the intermediate relief chamber 19 by suction port 57, forms air partition in the valve, thereby prevents the siphon refluence.
(3) if the pressure at water intake 76 places reduces or when negative pressure occurring, act on the hydraulic pressuring difference of barrier film about in the of 16 and reduce, drain valve spring 14 is pushed barrier film 16 downwards open, and drain valve 79 is opened, and the press waters in the intermediate relief chamber 19 are discharged by discharge opening 64.
Low resistance force counter flow stop provided by the invention has adopted decompression principle and equal pressing spring to have the characteristic of even elastic force, and drain valve has the function that opens and closes automatically, and in conjunction with Figure 10, the system of selection of the concrete process of argumentation and equal pressing spring radius of arc is following:
With DN100 (promptly 4 ") are example:
(1) all pressing spring has the demonstration of even elastic force and all affirmations of pressing spring radius of arc: reference: the arc spring lamination formula (combines figure below arc spring lamination structure and force analysis and chart 17-18 coefficient C among " Chinese Machine Design grand ceremony " the 3rd volume chapter 10 flat spring, wire spring, circlip and the elastic washer table 23.10-2
1, C
2And C
3):
Substantially horizontal amount of deformation fx=C
3Fr
3/ EI (1)
Substantially horizontal rigidity F ' x=EI/C
3r
3(2)
Wherein: r---radius of arc (mm)
C
3---coefficient detects C from following chart
3=1.5 when θ=140 ° (wherein value)
F---horizontal force load (Kg)
E---spring steel Young's modulus, E=7980Kg/mm
2
I---arc spring lamination cross sectional moment of inertia, I=bh
3/ 12 (3)
B---arc spring lamination width (mm)
H---arc spring lamination thickness (mm)
The substantially horizontal elastic force F ' of arc spring lamination=fx * F ' x=C
3Fr
3/ EI * EI/C
3r
3=F
This explanation is no matter the horizontal distortion amount of arc spring lamination has much; The elastic force of substantially horizontal equals the elastic force of original state forever; So this arc spring lamination is claimed equal pressing spring again; That is to say that arc spring lamination is no matter bend to any position (can not surmount the flexural stress limit position certainly) under the effect that adds thrust, the elastic force that it produced is constant.
According to standard GB 50015-2003 regulation, water-tight when pressure reduction is 20Kpa before and after the backflow preventer middle and upper reaches flap, water-tight when pressure reduction is 7Kpa before and after the flap of downstream, the designing requirement according to the present invention, the radius R of upper reaches flap 5
1=55mm, the radius R of downstream flap 11
2=60mm, then upper reaches Valve clack device adds thrust F
1=20KPa * ∏ * R
1 2=19Kg, upper reaches Valve clack device add thrust F
2=20KPa * ∏ * R
2 2=7.9Kg, the designing requirement according to the present invention, the ultimate range that two safety check flaps are opened all is fx=15mm, b
1=17.6mm, h
1=1.8mm, b
2=9.6mm, h
2=1mm learns I to above data substitution formula (3) and formula (1)
1=b
1h
1 3/ 12=17.6 * 1.8
3/ 12=8.5536, I
2=b
2h
2 3/ 12=9.6 * 1
3/ 12=0.8.
Fx=C
3F
1r
1 3/ EI
1, i.e. 15=1.5 * 19 * r
1 3/ 7980 * 8.5536, r then
1 3=35937, r
1=33mm
Fx=C
3F
2r
2 3/ EI
2, i.e. 15=1.5 * 7.9 * r
2 3/ 7980 * 0.8, r then
2 3=8000, r
2=20mm
The radius that this means upper reaches flap spring 4 is 33mm, and the elastic force that its produces is 19Kg, can satisfy watertight requirement when having 20KPa pressure reduction before and after the flap of the upper reaches; The radius of downstream flap spring 10 is 20mm, and the elastic force that its produces is 7.9Kg, can satisfy watertight requirement when having 7KPa pressure reduction before and after the flap of downstream.Also mean; It is constant that the pressure loss of press water after through upper reaches flap kept 20KPa; It is constant that the pressure loss during through the downstream flap is kept 7KPa, and so total pressure loss is the 20KPa+7KPa=27KPa=2.7M water column, and backflow preventer provided by the invention has lower resistance.
(2) realization that opens and closes automatically of drain valve
The designing requirement according to the present invention; All the time the pressure reduction that has 20KPa between intermediate relief chamber 19 and water intake 76 places, and the pressure in the conduit 12 equals the pressure at water intake 76 places all the time, so there is the pressure reduction of 20KPa up and down all the time in barrier film 16; Stipulate according to standard GB 50015-2003; The pressure in intermediate relief chamber 19 will be lower than more than the water intake 76 pressure 14KPa of place forever, and the above pressure reduction of this 14KPa is offset the pressure reduction that still has 6KPa up and down of barrier film 16 by drain valve spring 14; So the drain valve of this moment is in buttoned-up status.
When the pressure at water intake 76 places reduced, drain valve may be opened a part and let out and remove the pressure reduction that certain water yield keeps between intermediate relief chamber 19 and water intake 76 places and be not less than 14KPa, if when the pressure at water intake 76 places continues to be reduced to less than 14KPa to 0 or negative pressure; Drain valve spring 14 backs down barrier film 16; Make the end face of barrier film 16 leave the bottom surface of first water inlet 131, drain valve complete opening, the press waters in the intermediate relief chamber 19 are let out through discharge opening 64 and are removed; Simultaneously; Air is got in the intermediate relief chamber 19 by air suction port 57, forms air partition in the valve, thereby prevents that siphon from refluxing.
When the pressure at water outlet 77 places raises, near or when surpassing the pressure in the intermediate relief chamber 19, at this moment; If the downstream flap stifled be not closed completely or close when malfunctioning because of blocking, the pressure in the intermediate relief chamber 19 raise, the former pressure reduction reduction that pre-exists 20KPa between intermediate relief chamber 19 and water intake 76 places; Upper reaches flap 5 quick closedown under the elastic force effect of upper reaches flap spring 4 is so the pressure reduction of the former 20KPa of pre-existing continues to be reduced to less than 14KPa, at this moment between intermediate relief chamber 19 and water intake 76 places; Drain valve spring 14 backs down barrier film 16 rapidly; The drain valve complete opening, the press water in the intermediate relief chamber 19 is continued to drain through discharge opening 64, prevents that back pressure from refluxing.
Lower resistance decompression principle type backflow preventer of the present invention has following significantly advantage:
(1) novel in design, the clear principle of the present invention does not have dynamic seal, does not have easily damaged parts, has very high technical order, reliability and durability, and this lower resistance decompression principle type backflow preventer that is widely used can guarantee public health security.
(2) the present invention is different from the backflow preventer that adopts common spring; Adopted equal pressing spring; Make pressure water source only need overcome the elastic force originally of equal pressing spring; Need not the loss extra pressure and keep the further compression of equal pressing spring, just can make valve be in the complete opening state, thereby reach the purpose of using water wisely and energy saving.In addition, adopt the decompression principle, stopped the backflow of toxic liquid and contaminated liquid effectively, reached the purpose of safe water, do not had potential safety hazard.
(4) owing to adopted equal pressing spring, therefore, length of the present invention is short, and is short more a lot of than traditional common backflow preventer, almost is fit to all ready-made conduit shafts, saves mounting cost, and volume is little, in light weight, cost is low.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structural change of under enlightenment of the present invention, making, and every have identical or close technological scheme with the present invention, all falls within protection scope of the present invention.
Claims (9)
1. low resistance force counter flow stop comprises valve body, and the left and right two ends of said valve body are respectively equipped with water intake, water outlet; The inner chamber middle part of valve body is provided with the intermediate relief chamber; Said intermediate relief chamber realizes and the break-make of said water intake that through upper reaches Valve clack device said intermediate relief chamber is realized and the break-make of said water outlet through the downstream Valve clack device, it is characterized in that; Said upper reaches Valve clack device and said downstream Valve clack device are opened by equal pressing spring control; Also be provided with drain valve on the said valve body, said drain valve has first, second water inlet, discharge opening and suction port, and said first water inlet is communicated with said intermediate relief chamber; Said second water inlet is communicated with said water intake through conduit; Said first water inlet and second water inlet are separated through the elastic diaphragm device, and said elastic diaphragm device is opened during greater than the second water inlet pressure at the first water inlet pressure, is communicated with said first water inlet and said discharge opening; Said suction port is arranged on the valve body top of said drain valve, is communicated with ambient atmosphere.
2. low resistance force counter flow stop as claimed in claim 1; It is characterized in that; Said drain valve comprises that drain valve valve body and spiral shell are contained at the bottom of the drain valve valve on the drain valve valve body bottom surface, and said first water inlet is arranged on the end face center of said drain valve valve body, and said second water inlet is arranged on the bottom center place at the bottom of the said drain valve valve; Said discharge opening is made up of a plurality of through holes on being arranged at the bottom of the said drain valve valve, and a plurality of said through hole is uniformly distributed with setting around said second water inlet; Said elastic diaphragm device comprises barrier film and drain valve spring; End face at the bottom of the said drain valve valve is provided with first annular groove; Said barrier film is the cylindric and opening end that Open Side Down and is slidingly arranged in said first annular groove; The upper end of said drain valve spring is fixed on the inwall of said first water inlet, and the end face of lower end and said barrier film offsets.
3. low resistance force counter flow stop as claimed in claim 2; It is characterized in that; Said annular groove internal fixation is provided with the barrier film fixed base; Said barrier film fixed base is ring, and inwall extends upward the formation extension part, and the opening end of said barrier film is slidingly arranged in the gap between said extension part and the said annular groove madial wall.
4. low resistance force counter flow stop as claimed in claim 1; It is characterized in that; Said upper reaches Valve clack device comprises upper reaches flap fitting seat and upper reaches flap and the upper reaches flap spring that is fixed on the said valve interior wall, and said upper reaches flap fitting seat is bar shaped sheet and middle part and is provided with protrudingly in right-hand pit, and the right flank of pit is provided with at least two axially directed holes; The right side of said upper reaches flap is provided with and the suitable directional post in axially directed hole, and directional post is inserted in the axially directed hole; Said upper reaches flap spring is equal pressing spring, flexibly is arranged between upper reaches flap fitting seat and the upper reaches flap.
5. low resistance force counter flow stop as claimed in claim 4 is characterized in that, the middle part of said upper reaches flap fitting seat is provided with to the right the pit of protrusion, and the right-hand member of said upper reaches flap spring is fixedly installed in the said pit and left end and said upper reaches flap offset.
6. low resistance force counter flow stop as claimed in claim 4; It is characterized in that said downstream Valve clack device comprises downstream flap seat and downstream flap and the downstream flap spring on the inwall that is fixed on said valve body, said downstream flap seat ringwise; The outlet end center of said valve body is provided with downstream flap fitting seat; Downstream flap fitting seat is the round barrel shape of opening towards entrance point, and its outer peripheral surface is connected with the inwall of valve body through at least two connecting tendons, and the annular space between the side of connecting tendon and the downstream flap fitting seat outer peripheral surface forms water outlet; The wall portion of downstream flap fitting seat is provided with two axially directed holes; The right side of said downstream flap is provided with and the suitable directional post in said axially directed hole, and said directional post is inserted in the said axially directed hole, and said downstream flap spring is equal pressing spring; One end is arranged in the said pit, and the other end is resisted against on the right side of said downstream flap.
7. low resistance force counter flow stop as claimed in claim 6; It is characterized in that; The center, left side of said upper reaches flap and said downstream flap is respectively equipped with the boss of protrusion left, is respectively equipped with upstream valve flap seal pad and downstream valve flap seal pad around boss.
8. low resistance force counter flow stop as claimed in claim 6 is characterized in that, said equal pressing spring comprises fixed plate and be arranged on the arc spring lamination on the said fixed plate that the right side of said fixed plate is provided with two and is used for the fixing claw of plug-in mounting.
9. low resistance force counter flow stop as claimed in claim 4 is characterized in that, is respectively equipped with the flap bearing on the right side of said upper reaches flap and said downstream flap, and the free end of said arc spring lamination is resisted against on the outer peripheral surface of said flap bearing.
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| CN 201110258104 CN102322541B (en) | 2011-09-02 | 2011-09-02 | Low-resistance backflow preventer |
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|---|---|---|---|
| CN 201110258104 CN102322541B (en) | 2011-09-02 | 2011-09-02 | Low-resistance backflow preventer |
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| CN102322541A true CN102322541A (en) | 2012-01-18 |
| CN102322541B CN102322541B (en) | 2013-08-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821969A (en) * | 2014-01-28 | 2014-05-28 | 何际跃 | Follow-up backflow preventer |
| CN108915265A (en) * | 2018-06-26 | 2018-11-30 | 湖南响箭重工科技有限公司 | Pump truck belt cleaning device and pump truck |
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| CN201696681U (en) * | 2010-05-24 | 2011-01-05 | 杭州春江阀门有限公司 | Low resistance self-discharging backflow preventer |
| CN202209448U (en) * | 2011-09-02 | 2012-05-02 | 陈银周 | Low-resistance backflow stopper |
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| CN201696681U (en) * | 2010-05-24 | 2011-01-05 | 杭州春江阀门有限公司 | Low resistance self-discharging backflow preventer |
| CN202209448U (en) * | 2011-09-02 | 2012-05-02 | 陈银周 | Low-resistance backflow stopper |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821969A (en) * | 2014-01-28 | 2014-05-28 | 何际跃 | Follow-up backflow preventer |
| CN108915265A (en) * | 2018-06-26 | 2018-11-30 | 湖南响箭重工科技有限公司 | Pump truck belt cleaning device and pump truck |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102322541B (en) | 2013-08-28 |
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