CN108072100B - Floor heating pipeline leakage detection device and detection method - Google Patents

Floor heating pipeline leakage detection device and detection method Download PDF

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Publication number
CN108072100B
CN108072100B CN201810007116.6A CN201810007116A CN108072100B CN 108072100 B CN108072100 B CN 108072100B CN 201810007116 A CN201810007116 A CN 201810007116A CN 108072100 B CN108072100 B CN 108072100B
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China
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liquid
hydraulic
hydraulic pressure
liquid inlet
inlet valve
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CN201810007116.6A
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CN108072100A (en
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魏燕定
沈佳
方升
王彦哲
徐成军
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24DDOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00Details
    • F24D19/10Arrangement or mounting of control or safety devices
    • F24D19/1006Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves

Abstract

The floor heating pipeline leakage detection device is connected to a floor heating system and comprises a controller, a liquid inlet valve arranged on a liquid inlet main pipe, a liquid outlet valve arranged on a liquid outlet main pipe and a hydraulic measurement mechanism arranged between the liquid inlet valve and the liquid outlet valve; the hydraulic measuring mechanism consists of an elastic liquid storage balloon and a hydraulic gauge, the liquid storage balloon is communicated with a pipeline of the floor heating system, and the hydraulic gauge measures hydraulic pressure in the pipeline; the hydraulic pressure meter is connected with the controller, the controller obtains a hydraulic pressure-time curve output by the hydraulic pressure meter, and when the fluctuation of the hydraulic pressure-time curve reaches or exceeds a preset value, the controller sends out a liquid leakage alarm and closes the liquid inlet valve. The method for detecting the leakage of the floor heating pipeline comprises the steps that when the floor heating system is in a working state, a liquid outlet valve is closed firstly, and then a liquid inlet valve is closed; the controller obtains a hydraulic pressure-time curve; when the hydraulic pressure fluctuation reaches or exceeds the maximum allowable error of the hydraulic pressure meter, the controller sends out a leakage alarm. The invention has the advantages of high detection precision and capability of detecting the leakage pressure higher than 0.03 MPa.

Description

Floor heating pipeline leakage detection device and detection method
Technical Field
The invention belongs to the field of floor heating pipeline detection, and particularly relates to a floor heating pipeline liquid leakage detection device and a floor heating pipeline liquid leakage detection method.
Background
The floor heating is short for floor radiation heating, the whole floor is used as a radiator, the whole floor is uniformly heated through a heating medium in a floor radiation layer, and the heat conduction is carried out from bottom to top by utilizing the self heat storage and upward heat radiation rule of the floor, so that the purpose of heating is achieved.
The heat medium is divided into a water floor heating system and an electric floor heating system. The water floor heating is a mode of heating indoors by radiating and convecting low-temperature hot water at the temperature of not higher than 60 ℃ on the ground, wherein hot water circularly flows in a heating pipe to heat a floor.
The heating pipe of water ground heating is laid under the floor, and is difficult to discover in time when heating pipeline appears leaking, will reach very big area of leaking and can discover only usually, not only self economic loss is big, still probably will be bad for peripheral unit, resident family.
CN201310114164.2 discloses a ground heating pipe liquid leakage detection device, which is connected to the ground heating system, and comprises: the liquid inlet flow detector is arranged on the liquid inlet main pipe and can collect the real-time liquid inlet flow of the liquid inlet main pipe, the liquid outlet flow detector is arranged on the liquid outlet main pipe and can collect the real-time liquid outlet flow signal of the liquid outlet main pipe, the real-time liquid inlet flow signal and the real-time liquid outlet flow signal are compared, a liquid inlet and outlet flow comparator capable of outputting a control signal when the difference between the real-time liquid inlet flow and the real-time liquid outlet flow signal reaches or exceeds a difference set value, and a flow cut-off valve arranged on the liquid inlet main pipe and capable of enabling the liquid inlet main pipe to be in a liquid inlet state when the liquid inlet and outlet flow comparator outputs the control signal, and the liquid inlet flow detector, the liquid outlet flow detector and the flow. The detecting instrument detects the real-time liquid inlet amount of the liquid inlet main pipe and the real-time liquid outlet amount of the liquid outlet main pipe, when the difference value between the real-time liquid inlet amount and the real-time liquid outlet amount reaches a difference set value, the leakage of the floor heating pipeline is considered, and the liquid inlet of the liquid inlet main pipe is forbidden by closing the flow cut-off valve.
The disadvantages of such a detection device are: 1. the two flowmeters are used for respectively detecting the liquid inlet flow and the liquid outlet flow in real time, and the two flowmeters have manufacturing errors, so that the real-time flows respectively detected by the two flowmeters naturally have inevitable errors, and whether the water outlet pipe leaks or not can be detected only when the leakage amount is larger than the measuring error between the two flowmeters; when the leakage amount is small, the detection device cannot detect the leakage amount. 2. Both flow meters measure the real-time flow, so the flow meters must withstand the long-term scouring of hot water, causing sensitivity to drop; in addition, impurities are easily carried in the running process of hot water in the floor heating system, and the detection sensitivity of the flowmeter is reduced due to the accumulation of the impurities in the long-term use process.
Disclosure of Invention
The invention aims to provide a floor heating pipeline leakage detection device which is high in detection precision and can detect the leakage pressure higher than 0.03 MPa.
The floor heating pipeline leakage detection device is connected to a floor heating system and comprises a controller, a liquid inlet valve arranged on a liquid inlet main pipe, a liquid outlet valve arranged on a liquid outlet main pipe and a hydraulic measurement mechanism arranged between the liquid inlet valve and the liquid outlet valve; the hydraulic measuring mechanism consists of an elastic liquid storage balloon and a hydraulic gauge, the liquid storage balloon is communicated with a pipeline of the floor heating system, and the hydraulic gauge measures hydraulic pressure in the pipeline; the hydraulic pressure meter is connected with the controller, the controller obtains a hydraulic pressure-time curve output by the hydraulic pressure meter, and when the fluctuation of the hydraulic pressure-time curve reaches or exceeds a preset value, the controller sends out a liquid leakage alarm and closes the liquid inlet valve.
During leakage detection operation, the liquid outlet valve is closed firstly, and then the liquid inlet valve is closed, so that the elastic liquid outlet ball bag can be fully expanded, and the elastic liquid storage ball bag provides pressure maintaining micro-pressure for the pipeline. The hydraulic gauge continuously measures the hydraulic pressure in the pipeline and inputs the measured hydraulic pressure into the controller, and the controller obtains a hydraulic pressure-time curve. When the pipe is leak-free, the hydraulic pressure-time curve should be a straight line, the fluctuation of which does not exceed the maximum allowable error of the hydraulic pressure gauge, usually 0.03 Mpa. The maximum allowable error of the hydraulic gauge is taken as a preset value, and when the fluctuation of the hydraulic-time curve reaches or exceeds the preset value, the pipeline is indicated to have leakage and hydraulic pressure drop.
Further, the liquid storage balloon and the hydraulic gauge are connected to the floor heating pipeline through a tee joint. One joint of the tee joint is connected with the liquid storage balloon, the second joint is connected with the hydraulic gauge, and the third joint is connected with the floor heating pipeline. The floor heating pipeline comprises a liquid inlet header pipe, a liquid distribution header pipe, a liquid collection header pipe and a liquid outlet header pipe, wherein the liquid distribution header pipe is connected with the liquid inlet header pipe and the floor heating pipeline, the liquid collection header pipe is connected with the liquid outlet header pipe and the floor heating pipeline, and the tee joint is used for installing the hydraulic measuring mechanism on the liquid distribution header pipe or the liquid collection header pipe.
Further, the liquid inlet valve and the liquid outlet valve are controlled by a controller, the controller is provided with a power supply, a timing module, a control module and an alarm module, after the liquid inlet valve and the liquid outlet valve are closed by the control module, the timing module starts to detect time duration for timing, the hydraulic gauge enters a hydraulic detection state and continuously inputs a hydraulic signal to the control module, and the control module obtains a hydraulic-time curve; when leakage is found, the alarm module alarms and keeps the liquid inlet valve closed, and liquid inlet is forbidden to prevent further leakage. Otherwise, after the detection time of the timing module reaches the detection time, the control module starts the liquid inlet valve and the liquid outlet valve. The detection time period is usually set to 5min to 10 min. The power supply comprises a switching power supply and an emergency power supply.
Furthermore, the timing module is provided with a detection time length timing unit and an interval time length timing unit, the control module enables the liquid inlet valve and the liquid outlet valve to be started, the interval time length timing unit starts timing, and after the interval time length is reached, the control module closes the liquid inlet valve and the liquid outlet valve to enter a detection state.
Furthermore, hydraulic pressure measurement mechanism installs on dividing the liquid house steward, divides the liquid house steward and is located between hydraulic pressure measurement mechanism and the feed liquor valve with the connector of floor heating pipe. Thus, the hydraulic gauge avoids the portion of the pipeline that is flushed by the water flow. When the liquid inlet valve and the liquid outlet valve are closed and leak detection is carried out, the pressure of the whole pipeline is the same, and the hydraulic measurement of the hydraulic gauge is not influenced.
The floor heating pipeline leakage detection method comprises the following steps:
step 1: when the floor heating system is in a working state, the liquid outlet valve is closed first, then the liquid inlet valve is closed, and the liquid storage balloon can be fully expanded by the time difference of closing the liquid outlet valve and the liquid inlet valve
Step 2: within the detection time, the hydraulic gauge continuously inputs the measured hydraulic pressure into the controller, and the controller obtains a hydraulic pressure-time curve;
and step 3: the controller detects the fluctuation of the hydraulic pressure-time curve, and when the hydraulic pressure fluctuation reaches or exceeds the maximum allowable error of the hydraulic pressure meter, the controller sends out a liquid leakage alarm; if the hydraulic pressure-time curve is kept stable, when the detection duration is up, the controller opens the liquid inlet valve and the liquid outlet valve.
Further, in the step 1, the controller sends out an instruction to close the liquid outlet valve first, and close the liquid inlet valve after a specified time interval, wherein the specified time is based on the time required by the liquid storage balloon to be capable of fully expanding.
The invention has the advantages that:
1. the invention uses a hydraulic pressure meter to measure the hydraulic pressure in the pipeline, and eliminates the problem that the two measuring devices have errors, so that the invention can measure all the leakage with the leakage pressure higher than the maximum allowable error (0.03 MPa) of the hydraulic pressure meter, and can detect small leakage and seepage.
2. The hydraulic gauge only needs to be in a working state during measurement to measure the hydraulic pressure in the floor heating pipeline, and the hydraulic gauge is closed during non-measurement. In addition, the liquid flow rate in the liquid storage balloon is very low, and when the hydraulic gauge and the liquid storage balloon are connected into a floor heating pipeline through a tee joint, the liquid scouring degree of the hydraulic gauge is very low.
3. The elastic liquid storage balloon can be used for providing micro-pressure maintaining for the floor heating pipeline during measurement, and the floor heating pipeline can be prevented from being damaged by too high pressure.
Drawings
FIG. 1 is a schematic of the present invention.
In the figure, a liquid inlet valve 1, a liquid outlet valve 2, a liquid storage balloon 3, a three-way joint 4, a hydraulic gauge 5, a control module 6, an alarm module 7, a timing module 8, a switching power supply 9, an emergency power supply 10, a liquid inlet main pipe 11, a liquid outlet main pipe 12, a liquid distribution main pipe 13, a liquid collection main pipe 14 and a floor heating pipeline 15 in a room.
Detailed Description
As shown in fig. 1, this device of local heating pipe liquid leakage detection device connection on underfloor heating system includes: the liquid inlet valve 1 arranged on the liquid inlet main pipe 11 is arranged on the liquid outlet main pipe 12 and can cut off the liquid outlet valve 2, the liquid inlet valve 1 and the liquid outlet valve 2 can provide a hydraulic liquid storage ball bag 3 during the closing period, and the tee joint 4 connects the liquid storage ball bag 3 and the hydraulic gauge 5 to the liquid outlet main pipe 13.
The hydraulic pressure is measured by the hydraulic gauge 5 during the closing period of the liquid inlet valve 1 and the liquid outlet valve 2, and the data is transmitted to the control module 6, and the control module 6 enables the alarm module 7 to send out an alarm signal to prompt users and maintenance personnel when the difference of hydraulic data values acquired by closing the two cut-off valves for a period of time reaches or exceeds a set value. The control module 6 has a control panel capable of inputting parameters to the controller, and a timing module 8 that can signal the control module 6 at set intervals.
The hydraulic gauge used in this embodiment is a diffused silicon piezoresistive pressure transmitter. A diffused silicon piezoresistive pressure transmitter is designed for the field with a severe environment, and is characterized in that the piezoresistive effect of monocrystalline silicon is utilized, the monocrystalline silicon is used as a substrate, an elastic element is formed by an advanced micromachining technology according to a specific crystal orientation, four equivalent strain resistors are formed at proper positions of the elastic element by an integrated circuit process to form a Wheatstone bridge, a constant voltage (current) is applied to the bridge, when pressure (differential pressure) is applied to the elastic element, the elastic element outputs a voltage signal proportional to the applied pressure, and the voltage signal is amplified and converted into a three-wire system 0-5V output through an electronic circuit. The range can be customized from 0-6Mpa, the hydraulic pressure of the water pipe during the closing of the two cut-off valves can be completely detected, and the precision is very high and can reach +/-0.5% FS. The hydraulic pressure in the pipe can be accurately measured using the hydraulic pressure gauge.
The liquid inlet valve and the liquid outlet valve are closed for detection, during the leakage detection, the hydraulic gauge continuously inputs real-time hydraulic signals to the controller, the controller forms the hydraulic signals and time into a hydraulic-time curve, and when the fluctuation of the hydraulic-time curve exceeds 0.03Mpa, an alarm is sent out and the liquid inlet valve is kept closed.
In addition, the controller is provided with a control panel, so that the closing time of the two shut-off valves can be conveniently input, the difference value of hydraulic data in a set time period, the detection time interval and other parameters are set, and the working state can be conveniently adjusted.
The timing module 8 is provided with a detection time length timing unit and an interval time length timing unit, the control module enables the liquid inlet valve and the liquid outlet valve to be opened, the interval time length timing unit starts timing, and after the interval time length is reached, the control module closes the liquid inlet valve 1 and the liquid outlet valve 2 to enter a detection state.
The detection device comprises a liquid inlet main pipe 11, a liquid distribution main pipe 13, a liquid collection main pipe 16 and a liquid collection main pipe 12, wherein the liquid distribution main pipe 13 is connected with floor heating pipelines in the liquid inlet main pipe 11 and a room 15, the liquid collection main pipe 16 is connected with the floor heating pipelines in the liquid collection main pipe 12 and the room 15, and a hydraulic measurement mechanism is arranged on the liquid distribution main pipe 13 or the liquid collection main pipe 16 by a tee joint 4.
The hydraulic measuring mechanism is installed on the liquid distribution main pipe, and the connecting port of the liquid distribution main pipe and the floor heating pipeline is located between the hydraulic measuring mechanism and the liquid inlet valve. Thus, the hydraulic gauge avoids the portion of the pipeline that is flushed by the water flow. When the liquid inlet valve and the liquid outlet valve are closed and leak detection is carried out, the pressure of the whole pipeline is the same, and the hydraulic measurement of the hydraulic gauge is not influenced.
The floor heating pipeline leakage detection method comprises the following steps:
A. when the floor heating system is in a working state, closing the liquid outlet valve 2 to forbid liquid outlet at set time intervals, then closing the liquid inlet valve 1 to forbid liquid inlet, and then collecting signals of the hydraulic gauge 5;
B. and continuously for a period of time, comparing the acquired hydraulic data, judging that the floor heating system has leakage when the difference of the acquired hydraulic values reaches or exceeds a set value, and outputting an alarm signal, otherwise, outputting a control signal.
C. When the alarm signal is output, the liquid inlet main pipe 11 is controlled to be in a liquid inlet prohibition state, the control module 6 sends the alarm signal, the alarm module 7 sends an alarm to inform a user or a maintenance person, when the control signal is output, the leakage does not exist, and the liquid outlet valve 2 and the liquid inlet valve 1 are opened again.
In the step A, the liquid outlet valve 2 needs to be closed firstly, and then the liquid inlet valve 1 needs to be closed, so that the generation of back pressure, the entering of air and the like, and the false alarm is prevented.
The interval time between two leakage detection operations does not need to be short, and can be 6-8 h or longer, and is an acceptable scheme once a day. In principle, the test should be performed during a steady operation stage, and the stage just started needs to be avoided because air in the pipeline interferes with the test result.
According to the actual situation, the difference value of the hydraulic data in the set time period can also be set to reach or exceed 0.05Mpa, preferably 0.03Mpa, because 0.03Mpa is generally the maximum allowable error of the hydraulic gauge. The duration time is selected according to requirements, such as 5min-10 min.
In the above device for detecting liquid leakage in a floor heating pipe, the elasticity of the liquid storage balloon 3 needs to be configured as required, and is specified according to page 5 3.1.3 in technical code for radiant heating on the ground (JGJ 142-2004, the ministry of construction industry): the working pressure of the low-temperature hot water ground radiation heating system is not more than 0.8Mpa, so the liquid storage balloon 3 can bear the hydraulic pressure of at least 0.8 Mpa.
In the method for detecting the liquid leakage of the floor heating pipeline, the floor heating system starts to close the liquid outlet valve 2 at set intervals in the stable running process, closes the liquid inlet valve 1 at intervals and collects hydraulic data.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made or substituted in a similar manner to the described embodiments by those skilled in the art without departing from the spirit of the invention or exceeding the scope thereof as defined in the appended claims.

Claims (3)

1. Ground warm tube leakage detection device connects on underfloor heating system, its characterized in that: the detection device comprises a controller, a liquid inlet valve arranged on a liquid inlet main pipe, a liquid outlet valve arranged on a liquid outlet main pipe and a hydraulic measurement mechanism arranged between the liquid inlet valve and the liquid outlet valve; the hydraulic measuring mechanism consists of an elastic liquid storage balloon and a hydraulic gauge, the liquid storage balloon is communicated with a pipeline of the floor heating system, and the hydraulic gauge measures hydraulic pressure in the pipeline; the hydraulic pressure meter is connected with the controller, the controller acquires a hydraulic pressure-time curve output by the hydraulic pressure meter, and when the fluctuation of the hydraulic pressure-time curve reaches or exceeds a preset value, the controller sends out a liquid leakage alarm and closes the liquid inlet valve; the liquid storage balloon and the hydraulic gauge are connected to a floor heating pipeline through a tee joint; the liquid inlet valve and the liquid outlet valve are controlled by a controller, the controller is provided with a power supply, a timing module, a control module and an alarm module, after the liquid inlet valve and the liquid outlet valve are closed by the control module, the timing module starts to detect time length for timing, the hydraulic gauge enters a hydraulic detection state and continuously inputs a hydraulic signal to the control module, and the control module obtains a hydraulic-time curve; when liquid leakage is found, the alarm module alarms and keeps the liquid inlet valve closed; the timing module is provided with a detection time length timing unit and an interval time length timing unit, the control module starts timing by the interval time length timing unit after the liquid inlet valve and the liquid outlet valve are opened, and the control module closes the liquid inlet valve and the liquid outlet valve after the interval time length is reached and enters a detection state; the hydraulic measuring mechanism is installed on the liquid distribution main pipe, and the connecting port of the liquid distribution main pipe and the floor heating pipeline in the room is located between the hydraulic measuring mechanism and the liquid inlet valve.
2. A floor heating duct leakage detection method using the floor heating duct leakage detection device of claim 1, comprising the steps of:
step 1: when the floor heating system is in a working state, the liquid outlet valve is closed first, then the liquid inlet valve is closed, and the liquid storage balloon can be fully expanded due to the closing time difference of the liquid outlet valve and the liquid inlet valve;
step 2: within the detection time, the hydraulic gauge continuously inputs the measured hydraulic pressure into the controller, and the controller obtains a hydraulic pressure-time curve;
and step 3: the controller detects the fluctuation of the hydraulic pressure-time curve, and when the hydraulic pressure fluctuation reaches or exceeds the maximum allowable error of the hydraulic pressure meter, the controller sends out a liquid leakage alarm; if the hydraulic pressure-time curve is kept stable, when the detection duration is up, the controller opens the liquid inlet valve and the liquid outlet valve.
3. The floor heating pipe leakage detection method according to claim 2, characterized in that: in the step 1, the controller sends out an instruction to close the liquid outlet valve first, and close the liquid inlet valve after a specified time interval, wherein the specified time is based on the time required by the liquid storage saccule to be capable of fully expanding.
CN201810007116.6A 2018-01-04 2018-01-04 Floor heating pipeline leakage detection device and detection method Active CN108072100B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110132500A (en) * 2019-04-23 2019-08-16 上海海事大学 One kind being based on can bus floor heating pipeline leak point positioning device and method

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CN101290262A (en) * 2007-03-13 2008-10-22 通用汽车环球科技运作公司 System for detecting hydraulic flow leakage
CN201803839U (en) * 2010-09-21 2011-04-20 徐鸿涛 Fluid leakage analyzer
CN106871233A (en) * 2017-04-13 2017-06-20 山西意迪光华电力勘测设计有限公司 The expansion moisturizing voltage-stabilizing system and its regulation and control method of cogeneration of heat and power central heating network
CN206387082U (en) * 2017-01-18 2017-08-08 山东前卫环保设备有限公司 Single pump frequency conversion water replanishing device

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Publication number Priority date Publication date Assignee Title
KR200462979Y1 (en) * 2010-08-27 2012-10-11 양재구 Bladder type expansion tank having a water leakage detecting function

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101290262A (en) * 2007-03-13 2008-10-22 通用汽车环球科技运作公司 System for detecting hydraulic flow leakage
CN201803839U (en) * 2010-09-21 2011-04-20 徐鸿涛 Fluid leakage analyzer
CN206387082U (en) * 2017-01-18 2017-08-08 山东前卫环保设备有限公司 Single pump frequency conversion water replanishing device
CN106871233A (en) * 2017-04-13 2017-06-20 山西意迪光华电力勘测设计有限公司 The expansion moisturizing voltage-stabilizing system and its regulation and control method of cogeneration of heat and power central heating network

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