CN107687418B - A kind of novel water shortage determination method for no flow sensor constant pressure water supply system - Google Patents

A kind of novel water shortage determination method for no flow sensor constant pressure water supply system Download PDF

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Publication number
CN107687418B
CN107687418B CN201710749043.3A CN201710749043A CN107687418B CN 107687418 B CN107687418 B CN 107687418B CN 201710749043 A CN201710749043 A CN 201710749043A CN 107687418 B CN107687418 B CN 107687418B
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China
Prior art keywords
water
pressure
hydraulic pressure
water shortage
shortage
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CN201710749043.3A
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CN107687418A (en
Inventor
方桢峰
牛涛
彭俊标
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Ningbo Deye Inverter Technology Co., Ltd.
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Ningbo De Ye Converter Technique Inc Co
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00Testing machines, pumps, or pumping installations
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges

Abstract

The present invention discloses a kind of novel water shortage determination method for no flow sensor constant pressure water supply system, and in the case where pump water inlet water shortage, due to there is check-valves, water pump frequency reducing operation not will lead to the decline of water outlet pressure substantially;And in the presence of water, water pump frequency reducing will lead to pressure and be decreased obviously;But in the case where user closes valve, water pump frequency reducing will not be such that hydraulic pressure reduces, so needing raising frequency to handle, if raising frequency pressure energy rises, then it represents that otherwise closing valve is exactly water shortage.

Description

A kind of novel water shortage determination method for no flow sensor constant pressure water supply system
Technical field
The present invention relates to water system fields, and in particular to a kind of novel for no flow sensor constant pressure water supply system Water shortage determination method.
Background technique
Background of related of the invention is illustrated below, but these explanations might not constitute it is of the invention existing Technology.
In constant pressure water supply system, other than most basic constant pressure, also there are many protections, wherein not having water in water inlet In the case of, water pump is possible to run always to generate heat to damage motor.There are two the common methods of excessive low water level protection, connects flow biography Sensor either uses power (electric current) to judge.
Judged with flow sensor, advantage is accurate and high reliablity, the disadvantage is that at high cost;Its principle is to utilize one Flow sensor (perhaps water flow switch) when the analogue value fed back be lower than a threshold value after (or flow switch feedback it is low After voltage) it can be determined that and pass through for no water flow, and then excessive low water level protection is shut down;Cheap flow sensor is slow in water inlet water flow When slow, it is also possible to be mistaken for water shortage.
Judged with power, advantage is to reduce cost without adding flow sensor, the disadvantage is that versatility is low, is easy to miss Sentence;Its principle is, in maximum frequency operation water inlet have the case where water can than no water in the case where power it is big;Work as function Rate is may determine that when being lower than a threshold value as water shortage, but some water pumps, when water shortage, power can't decline, and compare instead Electric current is also big when normal water supply, so these situations will be mistaken for water shortage;Some pumps power when water outlet is closed Maximum, some pumps power in the case where water outlet standard-sized sheet is maximum, and the method versatility judged with power is too poor.
Summary of the invention
It is an object of the invention to propose a kind of novel water shortage judgement side for no flow sensor constant pressure water supply system Method;Without flow sensor, cost is reduced;To water pump type also no requirement (NR), will not because of water pump type it is different and judge by accident, mention The accuracy rate and versatility that water shortage determines in high constant pressure water supply system.
The novel water shortage determination method for no flow sensor constant pressure water supply system of one kind according to the present invention, using pressure The value of feedback of force snesor is judged;Prove that the water inlet of water pump has water when constant pressure is effective, without doing water shortage judgement;And work as When the water inlet water shortage of water pump, the pressure of pressure sensor feedback is unable to reach setting pressure, and water pump will operate in always most Big frequency does water shortage judgement in maximum frequency, and steps are as follows;
Water pump runs the T0 time with maximum frequency, while filtering record hydraulic pressure P0, then with the speed frequency reducing of 1hz per second, Reduce the frequency of F0;Water pump operation is stablized a seconds;Filter more new record hydraulic pressure P1 always in the process;If hydraulic pressure P0-P1 > △ P_d, then it represents that hydraulic pressure decline is obvious, and water outlet has water, is just restored to maximum frequency fortune at this time with the speed raising frequency of 1hz per second Row;If hydraulic pressure P0-P1 < △ P_d, hydraulic pressure P2 at this time after water pump operation is stablized a seconds is recorded, then water pump continues with per second The speed of 1hz is restored to maximum frequency, and then raising frequency 4hz, water pump operation are stablized b seconds again;During raising frequency, filter always More new record hydraulic pressure P3;If hydraulic pressure P3-P2 > △ P_d, then it represents that hydraulic pressure has rising, is that user closes valve, needs to shut down, and It is not that water shortage is shut down;If hydraulic pressure P3-P2 < △ P_d, can determine whether as water shortage.
Preferably, water shortage number cumulative number is added one if being judged as water shortage, if water shortage cumulative number is greater than setting Water shortage judges times N, then may determine that as water shortage shutdown.
Preferably, described a seconds and b second is all between 0.5 second to 4 seconds.
Preferably, the △ P_d is that frequency reducing disturbs drop, between 0.05-0.15bar.
Preferably, the T0 time is between 0.5 minute to 3 minutes.
Preferably, described judge times N between 2 times to 5 times.
Preferably, described a seconds and b second is all 2 seconds.
In the case where pump water inlet water shortage, due to there is check-valves, water pump frequency reducing operation not will lead to the present invention substantially The decline of water outlet pressure;And in the presence of water, water pump frequency reducing will lead to pressure and be decreased obviously;But valve is closed in user In the case where, water pump frequency reducing will not be such that hydraulic pressure reduces, so needing raising frequency to handle, if raising frequency pressure energy rises, then it represents that close Otherwise valve is exactly water shortage.
Compared with prior art, the invention has the beneficial effects that: 1) be not necessarily to flow sensor, reduce cost;2) to water Pump type no requirement (NR), will not because of pump type it is different and judge by accident;3) improve water shortage in constant pressure water supply system determine it is accurate Rate and versatility.
Specific embodiment
Exemplary embodiments of the present invention are described in detail below;Description to illustrative embodiments is only It for illustration purposes, is definitely not to the present invention and its application or the limitation of usage.
In present embodiment, water shortage judgement is carried out using the value of feedback of pressure sensor;When constant pressure is effective, illustrate into There is water at the mouth of a river, without doing water shortage judgement;When water inlet water shortage, setting pressure is not achieved in feedback pressure, to transport always Row is in maximum frequency, so needing to do water shortage judgement in maximum frequency operation.
In present embodiment, deterministic process are as follows: the T0 time is first run with maximum frequency, while filtering record hydraulic pressure P0, so Afterwards with the speed frequency reducing of 1hz per second, the frequency of F0 is at most reduced, then water pump is stablized 2 seconds again, filters always in the process more New record hydraulic pressure P1, once hydraulic pressure (P0-P1) > Δ P_d, then it represents that hydraulic pressure decline is obvious, and water outlet has water, at this time just with every The speed raising frequency of second 1hz is restored to maximum frequency operation;If after water pump is stablized 2 seconds and recording hydraulic pressure P2 at this time, hydraulic pressure (P0-P1) < Δ P_d then judges possible water shortage, is restored to maximum frequency at this time and with the speed of 1hz per second, then again Raising frequency 4hz water pump stable operation 2 seconds, within the period of this raising frequency, filters always more new record hydraulic pressure P3, once (P3-P2) > Δ P_d, then it represents that hydraulic pressure has rising, is that user closes valve, needs to shut down, but is not that water shortage is shut down;If P3-P2 is small In Δ P_d, then it represents that be really water shortage, water shortage cumulative number is added one at this time, sentence once water shortage cumulative number is greater than setting water shortage Disconnected times N then may determine that as water shortage shutdown.
In present embodiment, is judged using water shortage cumulative number, repeatedly determine water shortage, prevent to cause due to sensor error Erroneous judgement water shortage.
In present embodiment, in the case where water inlet water shortage, i.e., closing water inlet or water inlet are passed through air, water pump It can be run with maximum frequency 50hz, set and determined within 1 minute once in system, determine that times N is set as 3;And 3 in the case where water shortage Minute can be with orderly closedown, and indicator light shows water shortage failure;N is set as 2 can shut down and indicate failure for 2 minutes.
Although referring to illustrative embodiments, invention has been described, but it is to be understood that the present invention does not limit to The specific embodiment that Yu Wenzhong is described in detail and shows, without departing from claims limited range, this Field technical staff can make various changes to the illustrative embodiments.

Claims (3)

1. a kind of novel water shortage determination method for no flow sensor constant pressure water supply system, it is characterised in that: use pressure The value of feedback of sensor is judged;Prove that the water inlet of water pump has water when constant pressure is effective, without doing water shortage judgement;And work as water When the water inlet water shortage of pump, the pressure of pressure sensor feedback is unable to reach setting pressure, and water pump will operate in always maximum Frequency does water shortage judgement in maximum frequency, and steps are as follows;
Water pump runs the T0 time with maximum frequency, while filtering record hydraulic pressure P0, then with the speed frequency reducing of 1hz per second, reduces The frequency of F0;Water pump operation is stablized a seconds;Filter more new record hydraulic pressure P1 always in the process;
Hydraulic pressure if (P0-P1) > △ P_d, then it represents that hydraulic pressure decline is obvious, and water outlet has water, at this time just with the speed of 1hz per second Raising frequency is restored to maximum frequency operation;
If hydraulic pressure (P0-P1) < △ P_d, hydraulic pressure P2 at this time after water pump operation is stablized a seconds is recorded, then water pump continues with every The second speed of 1hz is restored to maximum frequency, and then raising frequency 4hz, water pump operation are stablized b seconds again;During raising frequency, filter always Wave more new record hydraulic pressure P3;Hydraulic pressure if (P3-P2) > △ P_d, then it represents that hydraulic pressure has rising, is that user closes valve, needs to stop Machine is not that water shortage is shut down;If hydraulic pressure (P3-P2) < △ P_d, can determine whether as water shortage, described a seconds and b second all for 0.5 second extremely Between 4 seconds, the △ P_d is that frequency reducing disturbs drop, and between 0.05-0.15bar, the T0 time is 0.5 minute to 3 points Between clock.
2. water shortage determination method according to claim 1, it is characterised in that: water shortage number is added up if being judged as water shortage Number adds one, if water shortage cumulative number is greater than setting, water shortage judges times N, may determine that as water shortage shutdown, the judgement time Number N is between 2 times to 5 times.
3. water shortage determination method according to claim 1, it is characterised in that: described a seconds and b second is all 2 seconds.
CN201710749043.3A 2017-08-28 2017-08-28 A kind of novel water shortage determination method for no flow sensor constant pressure water supply system Active CN107687418B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107687418B (en) * 2017-08-28 2019-03-01 宁波德业变频技术股份有限公司 A kind of novel water shortage determination method for no flow sensor constant pressure water supply system
CN112095714B (en) * 2020-08-17 2021-11-05 浙江达峰科技有限公司 Method for judging pressure water shortage of water column with pipeline of constant-pressure water supply system
CN112539182A (en) * 2020-12-07 2021-03-23 利欧集团浙江泵业有限公司 Detection method for water shortage protection of constant-pressure variable-frequency water pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201502074U (en) * 2009-09-03 2010-06-09 格兰富水泵(苏州)有限公司 Digital pipe network laminated water supply equipment
JP2010174842A (en) * 2009-02-02 2010-08-12 Hitachi Industrial Equipment Systems Co Ltd Water feed device
CN203684328U (en) * 2013-12-31 2014-07-02 重庆摩尔水处理设备有限公司 Water supply system
CN106438394A (en) * 2016-07-30 2017-02-22 陈辉 Water pump total-lift work control method, controller and water pump
CN107061248A (en) * 2016-11-18 2017-08-18 浙江美罗机电有限公司 A kind of control method of Water pump pressure controller
CN107687418A (en) * 2017-08-28 2018-02-13 宁波德业变频技术股份有限公司 It is a kind of new to be used for the water shortage decision method without flow sensor constant pressure water supply system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6970793B2 (en) * 2003-02-10 2005-11-29 Flow International Corporation Apparatus and method for detecting malfunctions in high-pressure fluid pumps

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010174842A (en) * 2009-02-02 2010-08-12 Hitachi Industrial Equipment Systems Co Ltd Water feed device
CN201502074U (en) * 2009-09-03 2010-06-09 格兰富水泵(苏州)有限公司 Digital pipe network laminated water supply equipment
CN203684328U (en) * 2013-12-31 2014-07-02 重庆摩尔水处理设备有限公司 Water supply system
CN106438394A (en) * 2016-07-30 2017-02-22 陈辉 Water pump total-lift work control method, controller and water pump
CN107061248A (en) * 2016-11-18 2017-08-18 浙江美罗机电有限公司 A kind of control method of Water pump pressure controller
CN107687418A (en) * 2017-08-28 2018-02-13 宁波德业变频技术股份有限公司 It is a kind of new to be used for the water shortage decision method without flow sensor constant pressure water supply system

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Address after: 315806 Ningbo 26 Beilun District, Zhejiang Province, Ningbo No.

Patentee after: Ningbo Deye Inverter Technology Co., Ltd.

Address before: 315806 No. 26 Yongjiang South Road, Beilun District, Ningbo, Zhejiang.

Patentee before: Ningbo De Ye converter technique incorporated company