CN201116625Y

CN201116625Y - Negative pressure resisting control valve

Info

Publication number: CN201116625Y
Application number: CNU200720015909XU
Authority: CN
Inventors: 阴文科; 郑志宏; 石景东
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-11-12
Filing date: 2007-11-12
Publication date: 2008-09-17
Anticipated expiration: 2017-11-12

Abstract

The utility model relates to a fluid pipeline protector, in particular to an anti-negative pressure control valve of public water supply pipeline, wherein case 1 of the valve is shaped as three-way tube, which comprises an inlet 2 and an outlet 5, while the upper opening is sealed by a gland 7, a switch base 3 provided with a through hole is arranged between the inlet 2 and the outlet 5, a switch plate 4 capable of switching is arranged above the switch seat 3, and a spring pressure regulator is pressed above the switch plate 4. The anti-negative pressure control valve can be connected between public water supply pipeline and user frequency-variable water supply device, to open and supply water when the pressure of public water supply pipeline reaches a preset valve and automatically close when the pressure is under the preset valve, thereby avoiding negative pressure on public water supply pipeline and realizing pressure balance and application order of public water supply pipeline. The utility model can significantly improve the water supply ability of prior device, confirm the safety of water supply pipeline and provide better service.

Description

Anti-negative pressure control valve

Affiliated technical field

The utility model is a kind of fluid circuit protective gear, particularly a kind of valve of protecting the public water supply pipeline, promptly a kind of anti-negative pressure control valve that is applicable to the public water supply pipeline.

Background technique

At present, the main mode that adopts public pipe network and double conversion feedwater to combine of China's urban life water supply is carried out.Promptly water is delivered to each water use sector and low layer user wherein, by the frequency conversion water work water is delivered to high-rise user again by public pipe network.Said frequency conversion water work is many to be made of single chip microcomputer, frequency variator, motor and water pump etc., at first set the working pressure of user's pipeline according to story height, pressure data by sensor acquisition user pipeline and offer microcomputer is handled motor by microcomputer by frequency variator and is driven pump working with suitable rotating speed again.Pressure in user's pipeline is high more, and the rotating speed of motor and water pump is low more, otherwise high more.When user's pipeline reaches setting pressure, or in the period of setting, equipment quits work, thereby guarantees user's water in energy-conservation.Adopt this hydrotechny, replace way of supplying water such as water tower, roof water tank, reduced the water facilities occupation of land, avoided secondary pollution, have crucial progressive meaning.,, and can not do instant adjustment with the variation of ductwork pressure owing to this frequency-converting control device is just operated according to the pressure condition of user's pipeline, in the pipe network water supply deficiency, running in the same old way, even accelerate running, thus cause pipe network negative pressure to occur.Pipe network negative pressure harm is very big, and is light then cause the water supply condition imbalance of each water use sector, and the heavy then destruction of causing pipeline has constituted threat to urban pipe network water supply balance and peripheral user's water safety.Harm for fear of the pipe network negative pressure, the State Council promulgation " town water supply regulations ", expressly provide " forbidding that direct armored pump draws water on the public water supply pipeline of city ", also release the multiple damping device that is contained between public pipe network and the variable frequency pump on the market, played certain effect for reducing pipe network negative pressure risk., opening air inlet when existing damping device adopts insufficient water more, the water pump aqueous vapor is taken out together, reduce the draw water measure of efficient of water pump, is a kind of can only " taking out less ", but the technology of can " not take out ".Simultaneously,, also can reduce the pressure of pipeline after water pump is bled, cause the speedup of variable frequency pump, its buffer function is had a greatly reduced quality owing to the difference of G﹠W physical behavior.Therefore, existing damping device can't fundamentally be evaded the negative pressure risk of pipe network.Along with the expansion of cities and towns scale and the sharp increase of tall building, the problem that water scarcity and water facilities development relatively lag behind highlights day by day, and factor that public water supply pipe network negative pressure threatens and degree are still increasing.We must change the demand for development of situation simple to be the technology path of starting point with user's loine pressure, at first to consider the pressure condition of pipe network that providing with the ductwork pressure parameter is the equipment of primary foundation, could avoid the harm of pipe network negative pressure from the source.Should be noted that: the pressure of considering user's one side merely, not only bring hidden danger to network security, also destroyed simultaneously the whole machine balancing of water system, reduced the water supply capacity of pipe network, the index that can reach is originally become difficult to achieve, be the demand of having looked after the user outwardly, be actually the interests that weakened the user.For this reason, the related management department of a plurality of provinces and cities has all put into effect corresponding regulation, requires frequency-changing water supply device to reach specified value when above at public ductwork pressure, the work of can turning round.If public ductwork pressure is lower than specified value, water pump assembly should be out of service., owing to lack corresponding apparatus, afore mentioned rules is difficult to carry out.

Summary of the invention

The purpose of this invention is to provide a kind of being connected between public pipe network and the user's frequency-changing water supply device, when the public water supply ductwork pressure reaches specified value, open water supply, the mechanical device of when specified value is following, closing automatically.

Above-mentioned purpose is realized by following technological scheme: develop a kind of no negative pressure control valve, this valve housing shape such as three-way pipe have an import, an outlet, and suitable for reading have gland to seal.In import between the outlet, be provided with the band through hole switch base, but above switch base, be provided with the switch plate of folding, be pressed with the spring pressure-regulating device above the switch plate.This anti-negative pressure control valve is installed on the joint of public water supply network and each user's frequency conversion water work, and sets the minimum pressure value that meets the pipe network requirement on valve during use, when ductwork pressure was lower than this force value, control valve was closed, and stopped to supply water.

The entrance point of said housing is provided with the joint that joins with the outlet of public water supply pipe network, and the outlet end of housing is provided with the joint that is connected with user's frequency-changing water supply device inlet.

Said spring pressure-regulating device is a spring, and the upper end of spring is connected on a slice compressing tablet, and the mesopore of compressing tablet is enclosed within on the screw press, and look nut is housed on the screw press, and the upper end of screw press is connected on the said inner walls.The lower end of spring is replaced on switch plate, and one side of switch plate is by rotating shaft and housing hinge mutually.

Said spring pressure-regulating device is that the depression bar of stretching on is housed above the said switch plate, depression bar passes the sliding sleeve that is connected mutually with housing, epimere is with spring, the spring lower end replace with compressing tablet that depression bar is connected mutually on, the upper end is replaced below look nut, and look nut is cylindrical, and there is the through hole of aperture greater than the depression bar diameter centre, peripheral surface is threaded, and with the pressure-regulating sleeve that is connected housing top in threads engaged.

Said spring pressure-regulating device is that the depression bar of stretching on is housed above the said pressing plate, and the main film with a softness behind the sliding sleeve that the depression bar epimere passes with housing is connected mutually links to each other, and the main film periphery is fitted in the joint of said gland and housing.Have two through holes on gland, one is the feedback discharge orifice, and another is an overflow hole.On the import sidewall of housing, have the defeated hole of pressing, on the outlet sidewall, have return port.Outside said housing, other has an auxilliary valve that interrelates by honeycomb duct and housing.The main body of auxilliary valve is an airtight sleeve, and barrel bore is divided into three chambeies of upper, middle and lower, is separated by by the auxilliary diaphragm of a slice softness between epicoele and the lumen, is separated by by dividing plate between lumen and the cavity of resorption.On the auxilliary diaphragm of epicoele pressure adjusting spring is housed, the pressure adjusting spring upper end is pressed with regulator bolts, and stretch out outside the auxilliary valve gap upper end of regulator bolts, and matches with the screw of auxilliary valve gap.Below auxilliary diaphragm push rod is housed, push rod passes dividing plate and arrives the cavity of resorption middle part.There is sealing plate the push rod lower end, cavity of resorption middle part sealing plate below or upper and lower surface respectively have a slice to constitute the airtight sealing seat that cooperates with sealing plate, top is the high pressure sealing seat, following is the low pressure seal seat.Have in the bottom of auxilliary valve cavity of resorption and to take the photograph head piece, cavity of resorption top has drainage port, has the undercurrent mouth in the lumen bottom.Pick out a honeycomb duct from the defeated hole of pressing, the honeycomb duct middle part joins through three-way pipe and feedback discharge orifice, honeycomb duct is the undercurrent mouth of the auxilliary valve lumen of termination in addition, the head piece of taking the photograph of the cavity of resorption bottom of auxilliary valve picks out one section honeycomb duct, this section honeycomb duct joins by upper ball valve and overflow hole, the drainage port of auxilliary valve picks out one section honeycomb duct, and honeycomb duct joins by following ball valve and the return port that exports on the sidewall.

The anti-negative pressure control valve that adopts such scheme to make, can be connected between public water supply pipe network and the user's frequency-changing water supply device, when reaching specified value, opens the public water supply ductwork pressure water supply, when specified value is following, close automatically, thereby the negative pressure risk of thoroughly having evaded the public water supply pipe network, and, set up rational water order condition is provided, thereby can significantly improve the water supply capacity of existing utility for realizing the integral pressure balance of public water supply pipe network.Therefore, adopt this device, not only can not weaken user's interests, and the inevitable working efficiency of significantly improving whole water system, when ensureing water supply network safety, provide better service for users.

Description of drawings

Fig. 1 is first kind of embodiment's a plan view;

Fig. 2 is second kind of embodiment's a plan view;

Fig. 3 is the third embodiment's a plan view;

Fig. 4 is that the third embodiment's parts enlarge plan view.

Among the figure as seen: housing 1, import 2, switch base 3, switch plate 4, the outlet 5, flange plate 6, gland 7, spring 8, screw press 9, rotating shaft 10, depression bar 11, sliding sleeve 12, look nut 13, pressure-regulating sleeve 14, compressing tablet 15, defeated hole 16, honeycomb duct 17, the pressure gauge 18 of pressing, feedback discharge orifice 19, three-way pipe 20, upper ball valve 21, auxilliary valve 22, overflow hole 23, diaphragm liner plate 24, main film 25, diaphragm seat 26, seal washer 27, following ball valve 28, return port 29, seal washer 30, sealing plate 31 is taken the photograph head piece 32, push rod 33, undercurrent mouth 34, auxilliary diaphragm liner plate 35, set screw 36, regulator bolts 37, auxilliary valve gap 38, auxilliary diaphragm 39, drainage port 40, high pressure sealing seat 41, low pressure seal seat 42.

Embodiment

First kind of embodiment: as shown in Figure 1, this control valve housing 1 shape such as three-way pipe, there is an import 2 on the left side, and there is an outlet 5 on the right, and suitable for reading have gland 7 to seal.Import 2 ends are provided with the flange plate 6 that joins with the outlet of public water supply pipe network, and outlet end is provided with the flange plate 6 that is connected with user's frequency-changing water supply device inlet.In import 2 between the outlet 3, be provided with the band through hole switch base 3, but above switch base 3, be provided with the switch plate 4 of folding, be pressed with the spring pressure-regulating device above the switch plate 4.The form of spring pressure-regulating device can have multiple, what this example was introduced is a spring 8, and the upper end of spring 8 is connected on a slice compressing tablet, and the mesopore of compressing tablet is enclosed within on the screw press 9, on the screw press 9 look nut is housed, the upper end of screw press 9 is connected on housing 1 inwall.The lower end of spring 8 is replaced on switch plate 4, and one side of switch plate 4 is by rotating shaft 10 and housing 1 hinge mutually.

This anti-negative pressure control valve is installed on the joint of public water supply network and each user's frequency conversion water work, and by adjusting the pressure of spring 8, sets the minimum pressure value that meets the pipe network requirement during use.When ductwork pressure was lower than this force value, switch plate 4 was pressed in above the switch base 3, and through hole is closed, and stopped to supply water.When pipe network water pressure was higher than the pressure of spring 8, switch plate 4 was open, current direction outlet, water supply start.

Second kind of embodiment: as shown in Figure 2, the spring pressure-regulating device here is more complicated than precedent.The depression bar of stretching on one 11 is housed on switch plate 4, depression bar 11 epimeres pass the sliding sleeve 12 suitable for reading with housing 1, be with spring 8 above, spring 8 lower ends replace with compressing tablet 15 that depression bar 11 is connected mutually on, the upper end is replaced below look nut 13, and look nut 13 is cylindrical, and is middle porose, the aperture can move up and down along depression bar 11 greater than the diameter of depression bar 11.Look nut 13 peripheral surfaces are threaded, with the threads engaged in the pressure-regulating sleeve 14 that is connected housing 1 top.Rotate look nut 13, can change the position of look nut 13, change the pressure of 8 pairs of depression bars 11 of spring, change the pressure of 4 pairs of switch bases 3 of switch plate.So just can set minimum cracking pressure, when pressure is low, stop to supply water.

The third embodiment: as shown in Figure 3, Figure 4, occurred two valves here, one is the main valve that said housing 1 and parts thereof constitute, and among another Fig. 3 is auxilliary valve 22, and by Fig. 4 auxilliary valve has been carried out further portrayal.Also be that a switch plate 4 is arranged between main valve import and the outlet as seen from Figure 3, the following seal washer 30 of switch plate 4 also is to match with switch base 3.Main valve suitable for reading picks out an independently hollow article, and there are seal washer 27 sealings the joint.And a main film 25 and a diaphragm liner plate 24 by softness is arranged in this hollow article, but the diaphragm of the dipping and heaving that diaphragm seat 26 constitutes at interval.The depression bar of stretching on one 11 also is housed above the switch plate 4, links to each other with diaphragm 25 and diaphragm liner plate 24 behind the sliding sleeve that depression bar 11 epimeres pass with housing is connected mutually.Have two through holes on gland 7, one is feedback discharge orifice 19, and another is an overflow hole 23.On the sidewall of import 2, have the defeated hole 16 of pressing, on the outlet sidewall, have return port 29.Main valve housing 1 interrelates by the auxilliary valve 22 outside honeycomb duct 17 and the housing.As seen from Figure 4, the main body of auxilliary valve 22 is airtight sleeves, and barrel bore is divided into three chambeies of upper, middle and lower, is separated by by the auxilliary diaphragm 39 and the auxilliary diaphragm liner plate 35 of softness between epicoele and the lumen, is separated by by dividing plate between lumen and the cavity of resorption.On the auxilliary diaphragm 39 of epicoele pressure adjusting spring 8 is housed, pressure adjusting spring 8 upper ends are pressed with regulator bolts 37, and stretch out outside the auxilliary valve gap 38 upper end of regulator bolts 37, and match with the set screw 36 of auxilliary valve gap 38.Below auxilliary diaphragm 39 and auxilliary diaphragm pressing plate 35 push rod 33 is housed, push rod 33 passes dividing plate and arrives the cavity of resorption middle part.There is sealing plate 31 push rod 33 lower ends, and the upper and lower surface of sealing plate 31 respectively has a slice can constitute the sealing seat of airtight relation with sealing plate 31 in the middle part of cavity of resorption, and top is high pressure sealing seat 41, and following is low pressure seal seat 42.Have in the bottom of auxilliary valve 22 cavity of resorptions and to take the photograph head piece 32, cavity of resorption top has drainage port 40, has undercurrent mouth 34 in the lumen bottom.Pick out a honeycomb duct 17 from the defeated hole 16 of pressing, honeycomb duct 17 joins with the undercurrent mouth 33 of presenting discharge orifice 19 and auxilliary valve 22 lumens respectively behind pressure gauge 18 and three-way pipe 20, the head piece 32 of taking the photograph of the cavity of resorption bottom of auxilliary valve 22 picks out another section honeycomb duct 17, this section honeycomb duct 17 joins by upper ball valve 21 and overflow hole 23, the drainage port 40 of auxilliary valve 22 picks out one section honeycomb duct 17 again, and this section honeycomb duct 17 joins by following ball valve 28 and the return port 29 that housing 1 exports on the sidewall.

Adjust the pressure of spring 8 before the work by the regulator bolts 36 of auxilliary valve 22, the sealing plate 31 of push rod 33 lower ends is pressed on the low pressure position sealing seat 42, and pressure equals the minimum pressure value of public water supply pipe network water supply, and this moment, the switch plate 4 of main valve also was pressed in above the switch base 3, was in closed condition.Under this setting means, following three kinds of situations can appear during work:

Situation one: if pipe network water supply pressure is less than setting value, the water that enters main valve inlet 2 is divided into two-way through honeycomb duct 17, one tunnel lumen that arrives auxilliary valve 22 is assisted diaphragm 39 times, another road is through presenting the epicoele that head piece 19 enters main film 25, and the head piece 32 of taking the photograph by flow-off 23 and auxilliary valve 22 arrives the cavity of resorption of assisting valve 22 again.Because water flow pressure is low, can't will assist diaphragm 39 and push rod 33 is raised, sealing plate 31 still is pressed in above the low pressure position sealing seat 42, and current are obstructed.The water of main film 25 epicoeles of main valve can not be discharged at this moment, and the chamber internal volume increases, and pushing main film 25 and depression bar 11 move down, and make switch plate 4 clamping switch seats 3, and main valve is closed, and stops to supply water.

Situation two: if pipe network water supply pressure is greater than setting value, the water flow pressure that enters auxilliary valve 22 epicoeles will be assisted diaphragm 39 and push rod 33 and sealing plate 31 and slowly be lifted, auxilliary valve 22 is in opening state, and auxilliary valve 22 is taken the photograph head piece 32 and drainage port 40 conductings, the outlet 5 that ball valve 28 enters main valve under the current warp.At this moment, the water of main valve main film 25 epicoeles is on state, loses pressure, and volume reduces, and makes on depression bar 11 and the switch plate 4 and moves, and main valve is opened, normal water supply.

Situation three: if pipe network water supply pressure is excessive, move on the auxilliary diaphragm 39 of auxilliary valve 22 continues, drive push rod 32 and sealing plate 31 reaches highest order and high pressure sealing seat 41 contacts.The current of auxilliary valve are cut off once more, and the water again of main valve epicoele can't be discharged, and the volume of main film 25 epicoeles increases once more, orders about depression bar and moves down, and main valve is closed once more.Like this, can prevent that too high hydraulic pressure from destroying user's supply channel facility.

Some explanation:

1. the high pressure sealing seat 41 of auxilliary valve not necessarily.

2. push rod 32 also can push up outside 38 through to valve, and regulator bolts 37 is enclosed within outside the push rod 33, also can adjust the pressure of spring 8.

3. can adopt the spring of specified pressure, thereby remove voltage regulation part.

All these modes all should be considered as the technological scheme that is equal to this example.

Claims

1. anti-negative pressure control valve, it is characterized in that: this valve housing (1) shape such as three-way pipe, an import (1) is arranged, an outlet (5), suitable for reading have gland (a 7) sealing, in import (2) between the outlet (5), be provided with the band through hole switch base (3), at switch base (3) but the top is provided with the switch plate (4) of folding, switch plate is pressed with the spring pressure-regulating device above (4).

2. anti-negative pressure control valve according to claim 1, it is characterized in that: import (2) end of said housing (1) is provided with the joint that joins with the outlet of public water supply pipe network, and outlet (5) end of housing (1) is provided with the joint that is connected with user's frequency-changing water supply device inlet.

3. anti-negative pressure control valve according to claim 1, it is characterized in that: said spring pressure-regulating device is a spring (8), the upper end of spring (8) is connected on a slice compressing tablet, the mesopore of compressing tablet is enclosed within on the screw press (9), screw press is equipped with look nut on (9), the upper end of screw press (9) is connected on said housing (1) inwall, and the lower end of spring (8) is replaced on switch plate (4), and one side of switch plate (4) is by rotating shaft (10) and housing (1) hinge mutually.

4. anti-negative pressure control valve according to claim 1, it is characterized in that: said spring pressure-regulating device is that the depression bar of stretching on (11) is housed above the said switch plate (4), depression bar (11) passes the sliding sleeve (12) that is connected mutually with housing (1), epimere is with spring (8), spring (8) lower end replace with compressing tablet (15) that depression bar (11) is connected mutually on, the upper end is replaced below look nut (13), look nut (13) is cylindrical, there is the through hole of aperture greater than depression bar (11) diameter the centre, peripheral surface is threaded, and with the pressure-regulating sleeve that is connected housing top (14) in threads engaged.

5. anti-negative pressure control valve according to claim 1, it is characterized in that: said spring pressure-regulating device is that the depression bar of stretching on (11) is housed above the said switch plate (4), depression bar (11) epimere links to each other with the main film (25) of a softness after passing the sliding sleeve that is connected mutually with housing (1), main film (25) periphery is fitted in below the said gland (7), on gland (7), have two through holes, one is feedback discharge orifice (19), another is overflow hole (23), on import (2) sidewall of housing (1), have the defeated hole (16) of pressing, on outlet (5) sidewall, have return port (29), outside housing (1), other has an auxilliary valve (22) that interrelates by honeycomb duct (17) and housing (1), the main body of auxilliary valve (22) is an airtight sleeve, barrel bore is divided into three chambeies of upper, middle and lower, be separated by by the auxilliary diaphragm (39) of a slice softness between epicoele and the lumen, be separated by by dividing plate between lumen and the cavity of resorption, pressure adjusting spring (8) is housed on auxilliary diaphragm (39), pressure adjusting spring (8) upper end is pressed with regulator bolts (37), push rod (33) is housed below auxilliary diaphragm (39), push rod (33) passes dividing plate and arrives the cavity of resorption middle part, there is sealing plate (31) push rod (33) lower end, below cavity of resorption middle part sealing plate (31) or upper and lower surface respectively have a slice to constitute the airtight sealing seat that cooperates with sealing plate (31), top is high pressure sealing seat (41), following is low pressure seal seat (42), have in the bottom of auxilliary valve (22) cavity of resorption and to take the photograph head piece (32), cavity of resorption top has drainage port (40), have undercurrent mouth (34) in the lumen bottom, defeated pressure hole (16) from opening (2) sidewall of housing (1) picks out a honeycomb duct (17), honeycomb duct (17) middle part joins with the undercurrent mouth (34) of presenting discharge orifice (19) and auxilliary valve (22) lumen respectively through three-way pipe (20), the head piece (32) of taking the photograph of the cavity of resorption bottom of auxilliary valve (22) picks out one section honeycomb duct, this section honeycomb duct joins by upper ball valve (21) and overflow hole (23), the drainage port (40) of auxilliary valve (22) picks out one section honeycomb duct, and honeycomb duct joins by following ball valve (28) and the return port (29) that exports on (5) sidewall.