CN102359633B - Water flow servo valve used for constant pressure - Google Patents
Water flow servo valve used for constant pressure Download PDFInfo
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- CN102359633B CN102359633B CN 201110291577 CN201110291577A CN102359633B CN 102359633 B CN102359633 B CN 102359633B CN 201110291577 CN201110291577 CN 201110291577 CN 201110291577 A CN201110291577 A CN 201110291577A CN 102359633 B CN102359633 B CN 102359633B
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Abstract
The invention relates to a water flow servo valve used for constant pressure for the purpose of realizing multistage constant pressure irrigation. The servo valve comprises a valve body and a diaphragm, wherein the horizontally positioned diaphragm is used for dividing the valve body into a reference pressure cavity and a water flow induction cavity, and the reference pressure cavity comprises an air outlet hole, a spring, a lead screw and a sliding block; corrosion resistant plates with equal areas respectively cover on the upper surface and the lower surface of the horizontally positioned diaphragm, upper and lower connection rods which are vertical to a diaphragm plane and are located at the upper and lower sides of the diaphragm are connected together and penetrate through the center of the diaphragm so as to be coincided with the perpendicular bisector of the diaphragm; the water flow induction cavity is provided with a water outlet, the lower part of the water flow induction cavity is connected with a water inlet throttling valve, and the lower part of the water inlet throttling valve is a roundness water inlet channel; and the water inlet channel is provided with three guide plates which are perpendicular to a round flow cross section and uniformly arranged on the inner wall of the round water inlet channel, and a cross section variation curve of a water inlet throttling valve core is labeled through calculation or test. The servo valve provided by the invention has the advantages of accurate and reliable constant pressure, full-automatic constant pressure process, simple structure and low investment, and is convenient for installation and use.
Description
Technical field:
The invention belongs to the field irrigation technical field, relate to a kind of Water flow servo valve used for constant pressure for realizing that multilevel distribution type constant pressure is irrigated.
Background technique:
So-called constant irrigation refers to the irrigation water constant pressure in the water pressure range of optimum, a kind of irrigation water supply mode that does not change because of the irrigation water changes in flow rate.It has that uniformity of irrigation water appilcation is high, pipe-line equipment is difficult for being damaged, water-saving, energy-conservation and supermatic characteristics.
Constant irrigation is because of its unique advantage that has, since unit such as Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences (Inst of Agricultural Irrigation, Ministry of Water Conservancy) etc. in 1984, since China's First constant pressure spriukler irrigation experimental project is built up in the Jiaxian County, Henan, obtained developing considerablely.The water supply form of constant irrigation is gone through air pressure pot type, variable-frequency governor formula, variable-frequency governor and small pneumatic tank convolution, and to multifunctional application and intelligent control future developments such as soft start, soft-off water hammer-resistants.The irrigation method of constant irrigation is also from the sprinkling irrigation in past to microspray irrigation, drip irrigation future development.Progressively formed a flourish important branch of irrigation system.
Existing constant irrigation technology generally is to adopt same water source, the same form of pouring water, same system model with water pressure, single-stage constant voltage.Because can not adapt to most of areas, China rural area, different patterns of farming take unshared housing as operating unit, different scale of operation, Different irrigation mode, land for growing field crops, warmhouse booth and the existing Agriculture production and management pattern of depositing have greatly limited applying of this advanced technology.
The effective way that solves an above-mentioned difficult problem is to realize that multilevel distribution type constant pressure irrigates, and realizes that the most critical equipment that low input, high reliability, the multilevel distribution type constant pressure of being convenient to manage are irrigated is Water flow servo valve used for constant pressure.
Summary of the invention:
The object of the present invention is to provide a kind of Water flow servo valve used for constant pressure for realizing that low input, high reliability, the multilevel distribution type constant pressure of being convenient to manage are irrigated.
The object of the present invention is achieved like this:
A kind of Water flow servo valve used for constant pressure, comprise: valve body, barrier film, the barrier film of horizontal positioned is divided into valve body with reference to pressure chamber and water flow sensing chamber two-part, with reference to having in the pressure chamber, air outlet hole, spring, leading screw, slide block, the cross section of leading screw is circular hollow, upper connecting rod is through wherein, the round slider that circular upright opening is arranged of horizontal positioned is placed in outside the leading screw, both are connected the slideway that spirals by the slide block endoporus and connect with the leading screw outer wall, the top of upper connecting rod is provided with air outlet hole in the leading screw of hollow, the top of leading screw is provided with the cross gap that spanner is regulated in interim installation, the barrier film of horizontal positioned upper, lower two sides is coated with respectively the corrosion resistant plate that area equates, perpendicular to diaphragm plane, be positioned on the barrier film, lower both sides upper, lower link connects together, pass with the perpendicular bisector of barrier film from the center of barrier film and to overlap, by upper, the fastening screw of lower link will cover the upper of barrier film, the corrosion resistant plate on lower two sides is pressed on the barrier film, the water flow sensing is provided with water outlet in the chamber, the bottom in water flow sensing chamber connects the water inlet throttle valve, it is the water inlet throttle valve seat of level circle and the water inlet throttling valve core that circular cross section changes from small to big from top to bottom that the water inlet throttle valve is provided with flow cross-section, the water inlet throttling valve core is vertically passed the horizontal free flow in circular section into the water throttle valve seat, overlap with the perpendicular bisector of horizontal free flow in circular section of water inlet throttle valve seat, the large end of water inlet throttling valve core cross section, be positioned at water inlet one side into the water throttle valve seat, the upstream face of water inlet throttling valve core is circular flat, the area of the lower corrosion resistant plate that covers on the barrier film is far longer than into the upstream face of water throttling valve core, the top of water inlet throttling valve core is connected with lower link, the bottom of water inlet throttle valve is circular intake tunnel, and intake tunnel is provided with three guide plates that are evenly arranged in circular intake tunnel inwall perpendicular to free flow in circular section.
Water flow servo valve used for constant pressure working principle of the present invention is as follows:
Because the area of the lower corrosion resistant plate that covers on the barrier film is far longer than the upstream face of throttling valve core, generally, the pressure that this upstream face is accepted also is far smaller than the pressure that the lower corrosion resistant plate that covers on the barrier film is accepted, and the compression that this upstream face produces can be ignored with reference to the active force of the spring in the pressure chamber.When the user stops water, be minimum value with water flow, the liquid in the water flow sensing chamber stops to flow, hydrodynamic pressure is zero, and hydrostatic pressure to be maximum value (equal discharge pressure H
Out), at this moment, the pressure that acts on the lower corrosion resistant plate that covers on the barrier film is maximum, and the compression of generation (equals H with reference to the active force of the spring in the pressure chamber is maximum
Out* A
p, A
pArea for the lower corrosion resistant plate that covers on the barrier film), make that the displacement that makes progress into the water throttling valve core is maximum (to equal the maximum displacement s that makes progress into the water throttling valve core
Max, mark is arranged in the accompanying drawing); After the user begins water, liquid in the water flow sensing chamber has also produced thereupon and has flowed, part hydrostatic pressure is converted into hydrodynamic pressure, the pressure that acts on the lower corrosion resistant plate that covers on the barrier film is reduced, the compression that produces also reduces with reference to the active force of the spring in the pressure chamber thereupon, the elastic force of compressed spring obtains part and discharges, and makes into the water throttling valve core to move down from the displacement biggest place that makes progress; The user is larger with water flow, the speed of the flow of fluid in the water flow sensing chamber is just larger, the part that hydrostatic pressure is converted into hydrodynamic pressure is just more, the pressure that acts on the lower corrosion resistant plate that covers on the barrier film is just fewer, the compression that produces is also less with reference to the active force of the spring in the pressure chamber, it is just more that the elastic force of compressed spring obtains discharging, and makes the distance that moves down into the water throttling valve core from the displacement biggest place that makes progress just larger.If represent with mathematic(al) representation be exactly:
s＝f(Q)——1
That is, the displacement s of water inlet throttling valve core is the function that the user uses water flow Q.More particularly, the displacement s of water inlet throttling valve core and user use water flow Q negative correlation.
Because intake tunnel is connected with the one-level constant-voltage system, intake pressure H
InBe steady state value, the purpose of Water flow servo valve used for constant pressure is to carry out the secondary constant voltage, and water outlet is connected discharge pressure H with secondary watering equipment (user)
OutAlso be steady state value, the pressure difference H of the rear and front end of Water flow servo valve used for constant pressure
In-H
OutBe steady state value also, Water flow servo valve used for constant pressure satisfies relation:
H
in-H
out＝S
uQ
2——2
In the formula, S
uModulus of resistance for Water flow servo valve used for constant pressure; Q was the volume flowrate of valve fluid, that is, the user uses water flow Q.Because Water flow servo valve used for constant pressure is crossed the size of water resistance, depend primarily on into the size of water throttle valve resistance, S
uCan regard as into the modulus of resistance of water throttle valve.And the modulus of resistance S of water inlet throttle valve
uThe function into the area A of the flow cross-section of water throttle valve, that is:
S
u＝f(A)——3
More particularly, the modulus of resistance S of water inlet throttle valve
uThe area A negative correlation of flow cross-section with the water inlet throttle valve.
And the area A of the flow cross-section of water inlet throttle valve is the function into the displacement s of water throttling valve core, that is:
A＝f(s) ——4
More particularly, the displacement s negative correlation of the area A of the flow cross-section of water inlet throttle valve and water inlet throttling valve core.
With 3,4 replacement, 2 formulas, obtain following formula:
H
in-H
out＝S
u(f(s))Q
2——5
Be transformed to again following formula:
Can find out from 1 formula and 6 formulas: the user all is functions into the displacement s of water throttling valve core with water flow Q, namely, the user uses the variation of water flow Q each time, the displacement s of an equal corresponding water inlet throttling valve core, and the modulus of resistance S of all corresponding Water flow servo valve used for constant pressure of the variation of the displacement s of the throttling valve core of intaking each time
u(f (s)).
According to 6 formulas, make the pressure difference H of the rear and front end of Water flow servo valve used for constant pressure
In-H
OutBe steady state value, that is, make Water flow servo valve used for constant pressure play the constant voltage effect, only need make the modulus of resistance S of Water flow servo valve used for constant pressure
u(f (s)) and user square are inverse relation and get final product with water flow Q's.
Spring adopts following formula to select:
F
max＝K×s
max+F
0＝H
out×A
p——7
In the formula, F
MaxBe positioned at the elastic force of maximum compression point for spring; K is the Young's modulus of spring; s
MaxBe the maximum displacement (mark is arranged in the accompanying drawing) that makes progress of water inlet throttling valve core; F
0Initial elastic force for spring; H
OutBe the discharge pressure of Water flow servo valve used for constant pressure, that is, and user's water constant pressure value; A
pArea for the lower corrosion resistant plate that covers on the barrier film.If selected spring has deviation, that is, and F
MaxH has appearred being not equal to
Out* A
pSituation, can be by regulate the adjusting spanner that is installed in leading screw top cross gap temporarily, rotating threaded shaft moves up and down slide block, compresses or pull-off spring, until F
MaxEqual H
Out* A
p, unload interim spanner.The purpose of this vernier device is set, and is to be convenient to batch production.
The change curve of the circular cross section that changes from small to big from top to bottom of water inlet throttling valve core, can launch according to 4 formulas and 6 formulas, obtain with the method for calculating, also can use the method for Experimental Calibration, the sample of the change curve of the circular cross section that changes from small to big from top to bottom of first acquisition water inlet throttling valve core, by the method for curve, carry out batch process production by numerically controlled lathe again.
The method of so-called Experimental Calibration: be at intake tunnel, adding upward pressure is H
InThe [constant that drives of variable-frequency governor, keep H
InBe steady state value, at water outlet a water tap be installed, by the different opening of water tap, the analog subscriber variation of water flow.Flow of every output, the radius of the circular cross section by changing the water inlet throttling valve core that flushes with water inlet throttle valve seat level circle water intake makes measured water pressure be stabilized in the discharge pressure steady state value H of design
OutOn.With the radius of the circular cross section of a series of water inlet throttling valve core of obtaining as abscissa x, the length travel of corresponding water inlet throttling valve core is as y coordinate y, the line of mapping has just obtained the sample of change curve of the circular cross section that changes from small to big from top to bottom of water inlet throttling valve core.
The present invention has following good effect:
1, Water flow servo valve used for constant pressure of the present invention because the change curve of water inlet throttling valve core cross section has been carried out calculating or Experimental Calibration, adds that constant voltage accurately and reliably into the design of water guide plate;
2, Water flow servo valve used for constant pressure of the present invention need not to add and drives and control gear, and constant voltage process is full-automatic, and is simple in structure, drops into low, installation, easy to use;
3, Water flow servo valve used for constant pressure of the present invention, when higher level's pipeline generation water hammer, water hammer pressure meets water through water inlet throttling valve core circle and is transmitted to spring buffer after accept on the plane, and water hammer harm is effectively contained.
Description of drawings:
Accompanying drawing is Water flow servo valve used for constant pressure schematic diagram of the present invention.
Embodiment:
A kind of Water flow servo valve used for constant pressure, as shown in drawings, comprise: valve body 1, barrier film 2, the barrier film 2 of horizontal positioned is divided into valve body 1 with reference to pressure chamber 3 and water flow sensing chamber 4 two-part, with reference to having in the pressure chamber 3, air outlet hole 3-1, spring 3-2, leading screw 3-3, slide block 3-4, the cross section of leading screw 3-3 is circular hollow, upper connecting rod 8-2 is through wherein, the round slider 3-4 that circular upright opening is arranged of horizontal positioned is placed in outside the leading screw 3-3, both are connected the slideway that spirals by slide block 3-4 endoporus and connect with leading screw 3-3 outer wall, the top of upper connecting rod 8-2 is provided with air outlet hole 3-3-1 among the leading screw 3-3 of hollow, the top of leading screw 3-3 is provided with the cross gap 3-3-2 that spanner is regulated in interim installation, the barrier film 2 of horizontal positioned upper, lower two sides is coated with respectively the corrosion resistant plate 2-1 that area equates, 2-2, perpendicular to barrier film 2 planes, be positioned on the barrier film 2, lower both sides upper, lower link 8-2,8-1 connects together, pass with the perpendicular bisector of barrier film 2 from the center of barrier film 2 and to overlap, by upper, lower link 8-2, the fastening screw of 8-1 will cover the upper of barrier film 2, the corrosion resistant plate 2-1 on lower two sides, 2-2 is pressed on the barrier film 2, be provided with water outlet 4-1 in the water flow sensing chamber 4, the bottom in water flow sensing chamber 4 connects the water inlet throttle valve, it is the water inlet throttle valve seat 6 of level circle and the water inlet throttling valve core 7 that circular cross section changes from small to big from top to bottom that the water inlet throttle valve is provided with flow cross-section, water inlet throttling valve core 7 is vertically passed the horizontal free flow in circular section into water throttle valve seat 6, overlap with the perpendicular bisector of horizontal free flow in circular section of water inlet throttle valve seat 6, the large end of water inlet throttling valve core 7 cross sections, be positioned at water inlet one side into water throttle valve seat 6, the upstream face 7-1 of water inlet throttling valve core 7 is circular flat, the area of the lower corrosion resistant plate 2-2 that covers on the barrier film 2 is far longer than the upstream face 7-1 into water throttling valve core 7, the top of water inlet throttling valve core 7 is connected with lower link 8-1, the bottom of water inlet throttle valve is circular intake tunnel 5, and intake tunnel 5 is provided with three guide plate 5-1 that are evenly arranged in circular intake tunnel 5 inwalls perpendicular to free flow in circular section.
Water flow servo valve used for constant pressure working principle of the present invention is as follows:
As shown in drawings, because the area of the lower corrosion resistant plate 2-2 that covers on the barrier film 2 is far longer than the upstream face 7-1 of throttling valve core 7, generally, the pressure that this upstream face 7-1 accepts also is far smaller than on the barrier film 2 pressure that the lower corrosion resistant plate 2-2 that covers accepts, and the compression that this upstream face 7-1 produces can be ignored with reference to the active force of the spring 3-2 in the pressure chamber 3.When the user stops water, be minimum value with water flow, the liquid in the water flow sensing chamber 4 stop to flow, hydrodynamic pressure is zero, and hydrostatic pressure to be maximum value (equal discharge pressure H
Out), at this moment, the pressure that acts on the lower corrosion resistant plate 2-2 that covers on the barrier film 2 is maximum, and the compression of generation (equals H with reference to the active force of the spring 3-2 in the pressure chamber 3 is maximum
Out* A
p, A
pArea for the lower corrosion resistant plate 2-2 that covers on the barrier film 2), make that the displacement that makes progress into water throttling valve core 7 is maximum (to equal the maximum displacement s that makes progress into water throttling valve core 7
Max, mark is arranged in the accompanying drawing); After the user begins water, liquid in the water flow sensing chamber 4 has also produced thereupon and has flowed, part hydrostatic pressure is converted into hydrodynamic pressure, the pressure that acts on the lower corrosion resistant plate 2-2 that covers on the barrier film 2 is reduced, the compression that produces also reduces with reference to the active force of the spring 3-2 in the pressure chamber 3 thereupon, the elastic force of compressed spring 3-2 obtains part and discharges, and makes into water throttling valve core 7 to move down from the displacement biggest place that makes progress; The user is larger with water flow, the speed of the flow of fluid in the water flow sensing chamber 4 is just larger, the part that hydrostatic pressure is converted into hydrodynamic pressure is just more, the pressure that acts on the lower corrosion resistant plate 2-2 that covers on the barrier film 2 is just fewer, the compression that produces is also less with reference to the active force of the spring 3-2 in the pressure chamber 3, it is just more that the elastic force of compressed spring 3-2 obtains discharging, and makes the distance that moves down into water throttling valve core 7 from the displacement biggest place that makes progress just larger.If represent with mathematic(al) representation be exactly:
s＝f(Q) ——1
That is, the displacement s of water inlet throttling valve core 7 is functions that the user uses water flow Q.More particularly, the displacement s of water inlet throttling valve core 7 and user use water flow Q negative correlation.
Because intake tunnel 5 is connected with the one-level constant-voltage system, intake pressure H
InBe steady state value, the purpose of Water flow servo valve used for constant pressure is to carry out the secondary constant voltage, and water outlet 4-1 is connected discharge pressure H with secondary watering equipment (user)
OutAlso be steady state value, the pressure difference H of the rear and front end of Water flow servo valve used for constant pressure
In-H
OutBe steady state value also, Water flow servo valve used for constant pressure satisfies relation:
H
in-H
out＝S
uQ
2——2
In the formula, S
uModulus of resistance for Water flow servo valve used for constant pressure; Q was the volume flowrate of valve fluid, that is, the user uses water flow Q.Because Water flow servo valve used for constant pressure is crossed the size of water resistance, depend primarily on into the size of water throttle valve resistance, S
uCan regard as into the modulus of resistance of water throttle valve.And the modulus of resistance S of water inlet throttle valve
uThe function into the area A of the flow cross-section of water throttle valve, that is:
S
u＝f(A)——3
More particularly, the modulus of resistance S of water inlet throttle valve
uThe area A negative correlation of flow cross-section with the water inlet throttle valve.
And the area A of the flow cross-section of water inlet throttle valve is the function into the displacement s of water throttling valve core 7, that is:
A＝f(s)——4
More particularly, the displacement s negative correlation of the area A of the flow cross-section of water inlet throttle valve and water inlet throttling valve core 7.
With 3,4 replacement, 2 formulas, obtain following formula:
H
in-H
out＝S
u(f(s))Q
2——5
Be transformed to again following formula:
Can find out from 1 formula and 6 formulas: the user all is functions into the displacement s of water throttling valve core 7 with water flow Q, namely, the user uses the variation of water flow Q each time, the displacement s of an equal corresponding water inlet throttling valve core 7, and the modulus of resistance S of all corresponding Water flow servo valve used for constant pressure of the variation of the displacement s of the throttling valve core 7 of intaking each time
u(f (s)).
According to 6 formulas, make the pressure difference H of the rear and front end of Water flow servo valve used for constant pressure
In-H
OutBe steady state value, that is, make Water flow servo valve used for constant pressure play the constant voltage effect, only need make the modulus of resistance S of Water flow servo valve used for constant pressure
u(f (s)) and user square are inverse relation and get final product with water flow Q's.
Spring 3-2 adopts following formula to select:
F
max＝K×s
max+F
0＝H
out×A
p——7
In the formula, F
MaxBe positioned at the elastic force of maximum compression point for spring 3-2; K is the Young's modulus of spring 3-2; s
MaxBe the maximum displacement (mark is arranged in the accompanying drawing) that makes progress of water inlet throttling valve core 7; F
0Initial elastic force for spring 3-2; H
OutBe the discharge pressure of Water flow servo valve used for constant pressure, that is, and user's water constant pressure value; A
pArea for the lower corrosion resistant plate 2-2 of covering on the barrier film 2.If selected spring has deviation, that is, and F
MaxH has appearred being not equal to
Out* A
pSituation, can be by regulate the adjusting spanner that is installed in leading screw 3-3 top cross gap 3-3-2 temporarily, rotating threaded shaft 3-3 moves up and down slide block 3-4, compresses or pull-off spring 3-2, until F
MaxEqual H
Out* A
p, unload interim spanner.The purpose of this vernier device is set, and is to be convenient to batch production.
The change curve 7-2 of the circular cross section that changes from small to big from top to bottom of water inlet throttling valve core 7, can launch according to 4 formulas and 6 formulas, obtain with the method for calculating, also can use the method for Experimental Calibration, the sample of the change curve 7-2 of the circular cross section that changes from small to big from top to bottom of first acquisition water inlet throttling valve core 7, by the method for curve, carry out batch process production by numerically controlled lathe again.
The method of so-called Experimental Calibration: be at intake tunnel 5, adding upward pressure is H
InThe [constant that drives of variable-frequency governor, keep H
InBe steady state value, at water outlet 4-1 a water tap be installed, by the different opening of water tap, the analog subscriber variation of water flow.Flow of every output, the radius of the circular cross section by changing the water inlet throttling valve core 7 that flushes with water inlet throttle valve seat 6 levels circle water intake makes measured water pressure be stabilized in the discharge pressure steady state value H of design
OutOn.With the radius of the circular cross section of a series of water inlet throttling valve core 7 of obtaining as abscissa x, the length travel of corresponding water inlet throttling valve core 7 is as y coordinate y, the line of mapping has just obtained the sample of change curve 7-2 of the circular cross section that changes from small to big from top to bottom of water inlet throttling valve core 7.
Claims (1)
1. Water flow servo valve used for constant pressure, it is characterized in that: comprise valve body (1), barrier film (2), the barrier film of horizontal positioned (2) is divided into valve body (1) with reference to pressure chamber (3) and water flow sensing chamber (4) two-part, with reference to having in the pressure chamber (3), air outlet hole (3-1), spring (3-2), leading screw (3-3), slide block (3-4), the cross section of leading screw (3-3) is circular hollow, upper connecting rod (8-2) is through wherein, the round slider that circular upright opening is arranged (3-4) of horizontal positioned is placed in outside the leading screw (3-3), both are connected 3-3 by slide block (3-4) endoporus with leading screw) slideway that spirals of outer wall connects, the top of upper connecting rod (8-2) is provided with air outlet hole (3-3-1) in the leading screw of hollow (3-3), the top of leading screw (3-3) is provided with the cross gap (3-3-2) that spanner is regulated in interim installation, the barrier film of horizontal positioned (2) upper, lower two sides is coated with respectively the corrosion resistant plate (2-1 that area equates, 2-2), perpendicular to barrier film (2) plane, be positioned on the barrier film (2), lower both sides upper, lower link (8-2,8-1) connect together, pass with the perpendicular bisector of barrier film (2) from the center of barrier film (2) and to overlap, by upper, lower link (8-2, fastening screw 8-1) will cover the upper of barrier film (2), corrosion resistant plate (the 2-1 on lower two sides, 2-2) be pressed on the barrier film (2), be provided with water outlet (4-1) in the water flow sensing chamber (4), the bottom in water flow sensing chamber (4) connects the water inlet throttle valve, it is the water inlet throttle valve seat (6) of level circle and the water inlet throttling valve core (7) that circular cross section changes from small to big from top to bottom that the water inlet throttle valve is provided with flow cross-section, water inlet throttling valve core (7) is vertically passed into the horizontal free flow in circular section of water throttle valve seat (6), overlap with the perpendicular bisector of horizontal free flow in circular section of water inlet throttle valve seat (6), the large end of water inlet throttling valve core (7) cross section, be positioned at water inlet one side into water throttle valve seat (6), the upstream face (7-1) of water inlet throttling valve core (7) is circular flat, the area of the upper lower corrosion resistant plate (2-2) that covers of barrier film (2) is far longer than the upstream face (7-1) into water throttling valve core (7), the top of water inlet throttling valve core (7) is connected with lower link (8-1), the bottom of water inlet throttle valve is circular intake tunnel (5), and intake tunnel (5) is provided with three guide plates (5-1) that are evenly arranged in circular intake tunnel (5) inwall perpendicular to free flow in circular section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110291577 CN102359633B (en) | 2011-09-30 | 2011-09-30 | Water flow servo valve used for constant pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110291577 CN102359633B (en) | 2011-09-30 | 2011-09-30 | Water flow servo valve used for constant pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102359633A CN102359633A (en) | 2012-02-22 |
| CN102359633B true CN102359633B (en) | 2013-03-27 |
Family
ID=45584999
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110291577 Expired - Fee Related CN102359633B (en) | 2011-09-30 | 2011-09-30 | Water flow servo valve used for constant pressure |
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| CN105942867B (en) * | 2016-07-21 | 2019-01-08 | 宁波博菱电器股份有限公司 | Coffee machine water route constant-current constant-pressure valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002023856A (en) * | 2000-07-07 | 2002-01-25 | Fujikura Rubber Ltd | Reducing valve for liquid |
| CN201377631Y (en) * | 2009-04-09 | 2010-01-06 | 浙江永久科技实业有限公司 | Visual-adjustment reducing valve |
| CN202252208U (en) * | 2011-09-30 | 2012-05-30 | 中国农业科学院农田灌溉研究所 | Waterflow servo valve used for constant pressure |
-
2011
- 2011-09-30 CN CN 201110291577 patent/CN102359633B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002023856A (en) * | 2000-07-07 | 2002-01-25 | Fujikura Rubber Ltd | Reducing valve for liquid |
| CN201377631Y (en) * | 2009-04-09 | 2010-01-06 | 浙江永久科技实业有限公司 | Visual-adjustment reducing valve |
| CN202252208U (en) * | 2011-09-30 | 2012-05-30 | 中国农业科学院农田灌溉研究所 | Waterflow servo valve used for constant pressure |
Also Published As
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|---|---|
| CN102359633A (en) | 2012-02-22 |
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