CN110836746A - Method and device for safely detecting water flow in closed pipeline - Google Patents
Method and device for safely detecting water flow in closed pipeline Download PDFInfo
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- CN110836746A CN110836746A CN201810931791.8A CN201810931791A CN110836746A CN 110836746 A CN110836746 A CN 110836746A CN 201810931791 A CN201810931791 A CN 201810931791A CN 110836746 A CN110836746 A CN 110836746A
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- water
- water pressure
- pipeline
- water flow
- water pump
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention relates to a water flow safety detection method, which is characterized in that static water pressure before a water pump is started and dynamic water pressure after the water pressure is stable after the water pump is started are detected, and the static water pressure after the water pump is stopped and the water pressure is stable is compared with a preset water pressure value, so that the conditions of whether the water pressure is abnormal, whether the water pump is abnormal and whether a water body flows are obtained. The invention also relates to a water flow safety detection device in the closed pipeline, which comprises a Venturi tube arranged in the water flow pipeline, a water pressure sensor arranged on the Venturi tube, and a controller electrically connected with the water pressure sensor. The water flow safety detection device in the closed pipeline has few components and low cost. The water flow safety detection method can be used for acquiring whether the water body flows, so that the use safety of the closed pipeline and the internal working parts thereof is ensured.
Description
Technical Field
The invention relates to the technical field of waterway safety detection, in particular to a detection method of a water flow safety detection device in a closed pipeline, and also relates to a water flow safety detection device applying the method.
Background
A closed heating water channel is arranged in the gas heating water heater or the gas heating furnace, a closed plate exchange heating water channel is arranged in the plate exchange type gas heating water heater, and a circulating water pump is arranged in the water channel and used for pushing water flow to flow. In order to ensure the safety of the closed waterway, the water pressure of the pipeline needs to be kept within a certain range, and when the water pressure is lower than a safety lower limit value, the problem that the temperature of water in the waterway is too high or even dry burning may occur. If the water in the water path begins to be heated under the condition that the water path can not normally flow, the temperature of the water in the water path rises suddenly instantly, and the normal operation of various devices in the water path is influenced. The normal work of subassembly in the pipeline can be influenced when the water pressure is higher than safe upper limit value, if direct influence water route in the normal work of water pressure sensor, can't acquire accurate water pressure information.
In the prior art, methods such as a water pressure flap switch, a differential pressure sensor, water temperature abnormal logic judgment and the like are generally adopted to detect whether a waterway is in a flowing state. The hydraulic pressure copying switch is easy to have a mechanical locking fault, the cost of the differential pressure sensor is high, the water temperature abnormal logic judgment belongs to post judgment, and if abnormal combustion occurs when the water flow in the water channel is judged not to flow, certain adverse effects are caused by the delay of the judgment result.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a water flow safety detection method capable of rapidly detecting a water flow condition and determining a water pressure abnormal condition and a water pump fault in view of the above prior art.
The second technical problem to be solved by the present invention is to provide a water flow safety detection device in a closed pipeline, which can detect the water pressure and water flow condition in the closed pipeline only by a simple structure.
The technical scheme adopted by the invention for solving the first technical problem is as follows: a water flow safety detection method is characterized in that: the method comprises the following steps:
s1, detecting and acquiring the static water pressure P of the water flow in the water flow pipeline in the static state1；
S2, pressing the static water pressure P1And safe static water pressure range [ P1l,P1h]Low safe static water pressure threshold P of medium1lAnd a high safety static water pressure threshold value P1hMaking a comparison in which P1l＜P1h；
If P is1l≤P1≤P1hIf not, judging that the water pressure is normal, otherwise, judging that the water pressure is abnormal;
s4, detecting and acquiring dynamic water pressure P after water pressure is stable after the water pump is started2；
S5, judging whether P is present2＞P1+ΔPXIn which Δ PXThe minimum threshold value of the increase of the water pressure after the water pump is started is shown, if yes, the water pump is judged to be normally started and the water body in the water flow pipeline flows, and if not, the water pump is judged to be in fault;
s6, detecting and acquiring the static water pressure P after the water pump is closed and the water pressure is stable3；
S7, judging whether P is present3＜P2－ΔPYIn which Δ PYAnd the minimum threshold value represents the water pressure reduction after the water pump is shut down, if so, the water pump is judged to be normally shut down, and if not, the water pump is judged to be in fault.
Further improved, in the water flowing process, whether the abnormal stop water pressure P exists or not is detected and obtained4，P4＜P30－ΔPZIn which P is30Indicates the maximum water pressure value delta P in the water pressure stable time interval when the water pump worksZAnd the maximum value represents the maximum value of the reduction allowed by the water pressure when the water pump works normally, and if the maximum value is the maximum value, the water pump is judged to be abnormally closed in the running process.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides a rivers safety inspection device in closed pipeline which characterized in that: comprises that
The Venturi tube is arranged in the water flow pipeline;
the water pressure sensor is arranged on the Venturi tube and used for detecting the water pressure in the Venturi tube;
and the controller is electrically connected with the water pressure sensor and used for receiving the water pressure signal transmitted by the water pressure sensor and carrying out safety judgment and response control according to the water pressure signal.
Optionally, the water pressure sensor is disposed at the throat of the venturi, on the converging section of the venturi proximate the throat, and/or on the inlet section of the venturi.
Preferably, the device further comprises an alarm electrically connected with the controller.
Compared with the prior art, the invention has the advantages that: the water flow safety detection device in the closed pipeline has few components and low cost. The venturi tube is arranged to amplify the change process of water pressure, and then the water pressure sensor is used for detecting the change of water pressure, so that the flowing condition of the water in the pipeline can be judged. The starting and stopping conditions of the water flow in the pipeline can be detected through the corresponding water flow safety detection method, and whether the water pressure is normal or not and whether the water pump is in fault or not can be judged according to the water pressure change condition. Especially for a closed pipeline needing heating, if the closed pipeline is applied to a main heat exchanger pipeline of a gas heating device, the water flow safety detection device can be matched with the heating device for use, whether water in the pipeline flows can be quickly acquired, the heating device can be restarted under the condition that the water in the closed pipeline is normal, the condition that the water in the pipeline does not flow is heated abnormally or the water temperature in the pipeline rises suddenly due to the fact that the water flow is too small can be effectively avoided, and the use safety of the closed pipeline and internal working parts of the closed pipeline is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a water flow safety detection device in a closed pipeline in an embodiment of the invention.
Fig. 2 is a flow chart of a water flow safety detection method according to an embodiment of the invention.
Fig. 3 is a relationship diagram of a water pump state and a water pressure change curve in a normal switch state of the water pump.
Fig. 4 is a graph showing a relationship between a state of the water pump and a water pressure change curve in an abnormal shut-off state of the water pump.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The water flow safety detection device in the embodiment can be applied to various closed pipelines to detect water flow conditions such as water pressure, flow velocity and flow in the closed pipelines, and further can be conveniently used for controlling other functions according to the information. The water flow safety detection device can be suitable for closed heating water channels such as gas heating water heaters and gas heating furnaces, is particularly suitable for main heat exchanger pipelines of the devices, and can solve the problems of abnormal combustion and the like under the conditions that water temperature is too high, dry combustion is carried out, water pressure is too high, and the water channels do not flow in the main heat exchanger pipelines.
As shown in fig. 1, the device for detecting the safety of water flow in a closed pipeline in the present embodiment includes a water flow pipeline, a venturi tube 1, a water pressure sensor 2, a controller 3, and an alarm 4. Wherein water pressure sensor 2, alarm 4 are connected with controller 3 electricity respectively, and this alarm 4 can set up to audible alarm 4, alarm lamp, display etc. as required. The controller 3 can adopt an existing control chip alone or directly use a control circuit board in the application environment of the water flow safety detection device as the controller 3.
The water flow safety detection device can be applied to a common water flow pipeline, but is particularly suitable for a closed water flow pipeline, the water flow pipeline in the embodiment adopts at least two sections of existing water pipes, and the Venturi tube 1 is connected between the two sections of water pipes, namely is arranged in the water flow pipeline. The two ends of the water flow pipeline are connected with the corresponding connectors.
As in the prior art, the venturi tube 1 includes an inlet section, a contraction section, a throat section, and a diffuser section, which are sequentially communicated. Because venturi 1's self structural feature can strengthen the change of rivers velocity of flow in the rivers pipeline, and then arouse the rapid change of water momentum, so can judge whether rivers flow and the flow of rivers through the pressure variation that detects in the rivers pipeline.
Water pressure sensor 2 is then installed on venturi 1, and the real-time detection of this water pressure sensor 2 acquires the water pressure data in venturi 1. The water pressure sensor 2 transmits the acquired water pressure data to the controller 3, and the controller 3 can perform safety judgment and response control according to the received water pressure signal, and respond to the alarm 4, a circulating water pump in a water flow pipeline, a heating device in a water flow safety detection device installation environment and the like.
The water pressure sensor 2 may be provided at the throat of the venturi 1, at a position near the throat on the contraction section of the venturi 1, and/or on the inlet section of the venturi 1, as required. In this embodiment, the water pressure sensor 2 is disposed at the inlet section of the venturi tube 1, and in order to make the detection result more accurate, the water pressure sensor 2 may be disposed at the throat of the venturi tube 1 and at the contraction section of the venturi tube 1, respectively.
When the circulating water pump in the closed water flow pipeline does not work and the water in the water flow pipeline is in a static state, the water in the Venturi tube 1 is correspondingly in the static state, and at the moment, the water pressure at each position in the water flow pipeline is the same and is recorded as the static water pressure. Open when circulating water pump, the water in the rivers pipeline begins to flow, then can arouse the water pressure in the rivers pipeline to take place undulantly, and this water pressure undulantly range can be strengthened to venturi 1, then detect the water pressure change in venturi 1 can the effectual information that begins to flow of acquisition rivers. And the fluctuation water pressure under the condition that water flow in the closed pipeline starts to flow is smaller than the static water pressure, and the larger the water flow is, the larger the deviation between the fluctuation water pressure and the static comfort is. When the water flow in the water flow pipeline is stable, the water pressure in the water flow pipeline is stable again, the water pressure at each position is the same, and the dynamic water pressure during the water flow is smaller than or close to the static water pressure.
As shown in fig. 2, the water flow safety detection method implemented by the water flow safety detection device in this embodiment includes the following steps:
s1, detecting the static water pressure P in the static state of the water flow in the inlet section of the Venturi tube 1 by using the water pressure sensor 21(ii) a As shown in FIGS. 3 and 4, upon power-up, at T1To T2During the time interval of (2), detection in the water pressure sensorThe data gradually increases until it stabilizes, then at T2To T3In the time interval, the water pressure sensor 2 can accurately reflect the static water pressure P in the inlet section of the venturi tube 1 at the moment1；
S2, the controller 3 receives the static water pressure P detected and obtained by the water pressure sensor 21And applying a static water pressure P1And safe static water pressure range [ P1l,P1h]Low safe static water pressure threshold P of medium1lAnd a high safety static water pressure threshold value P1hMaking a comparison in which P1l＜P1h；
If P is1l≤P1≤P1hJudging that the water pressure in the water flow channel is normal; if P is1＜P1lOr P1＞P1hJudging that the water pressure in the water flow channel is abnormal, and alarming by an alarm;
s3, detecting the dynamic water pressure P after the water pressure is stable after the water pump is started by using the water pressure sensor 22(ii) a During specific detection, when the water pressure fluctuation detected by the water pressure sensor 2 within a set time length does not exceed a certain error range, the water pressure is considered to be stable; as shown in fig. 3 and 4, when the water pump is turned on, the water pressure will change due to the water flowing in the pipeline, such as T when the water pump is just turned on3To T4In the time interval, the water pressure is gradually increased, and when the water body in the pipeline flows stably, the water pump works at T4To T5In the time interval of (2), the water pressure is stabilized at the dynamic water pressure P2；
S4, the controller judges whether P is available2＞P1+ΔPXIn which Δ PXThe minimum threshold value of the increase of the water pressure after the water pump is started is shown, if yes, the water pump is judged to be normally started and the water body in the water flow pipeline flows, and if not, the water pump is judged to be in fault;
if the water pump is abnormally closed under the condition that the water pump does not receive the stop control signal of the controller, the water pressure in the pipeline is correspondingly changed, and whether the abnormal stop water pressure P exists or not is detected and obtained4，P4＜P30－ΔPZIn which P is30Indicates the maximum water pressure value delta P in the water pressure stable time interval when the water pump worksZThe maximum value of the water pressure allowed to be reduced when the water pump works normally is shown, and if the maximum value is shown, the water pump is judged to be abnormally closed in the running process; as shown in FIG. 4, the water pump is in T condition without receiving the closing signal of the controller5To T6If the water pressure is reduced in the time interval, whether the water pump is abnormally closed in the running process needs to be judged;
s5, the water pressure sensor 2 detects and obtains the static water pressure P after the water pump is closed and the water pressure is stable3And transmitting to the controller; if the water pump is normally shut down under the control of the controller, as shown in FIG. 3, at T5To T7The water pressure can be reduced in the time interval;
s6, the controller judges whether P is available3＜P2－ΔPYIn which Δ PYAnd the minimum threshold value represents the water pressure reduction after the water pump is shut down, if so, the water pump is judged to be normally shut down, and if not, the water pump is judged to be in fault.
The water flow safety detection device in the closed pipeline has few components and low cost. The venturi tube is arranged to amplify the change process of water pressure, and then the water pressure sensor is used for detecting the change of water pressure, so that the flowing condition of the water in the pipeline can be judged. The starting and stopping conditions of the water flow in the pipeline can be detected through the corresponding water flow safety detection method, and whether the water pressure is normal or not and whether the water pump is in fault or not can be judged according to the water pressure change condition. Especially for a closed pipeline needing heating, if the closed pipeline is applied to a main heat exchanger pipeline of a gas heating device, the water flow safety detection device can be matched with the heating device for use, whether water in the pipeline flows can be quickly acquired, the heating device can be restarted under the condition that the water in the closed pipeline is normal, the condition that the water in the pipeline does not flow is heated abnormally or the water temperature in the pipeline rises suddenly due to the fact that the water flow is too small can be effectively avoided, and the use safety of the closed pipeline and internal working parts of the closed pipeline is guaranteed.
Claims (5)
1. A method for detecting the safety of water flow in a closed pipeline is characterized by comprising the following steps: the method comprises the following steps:
s1, detecting and acquiring the static water pressure P of the water flow in the water flow pipeline in the static state1；
S2, pressing the static water pressure P1And safe static water pressure range [ P1l,P0h]Low safe static water pressure threshold P of medium1lAnd a high safety static water pressure threshold value P1hMaking a comparison in which P1l＜P1h；
If P is1l≤P1≤P1hIf not, judging that the water pressure is normal, otherwise, judging that the water pressure is abnormal;
s3, detecting and acquiring dynamic water pressure P after water pressure is stable after the water pump is started2；
S4, judging whether P is present2＞P1+ΔPXIn which Δ PXThe minimum threshold value of the increase of the water pressure after the water pump is started is shown, if yes, the water pump is judged to be normally started and the water body in the water flow pipeline flows, and if not, the water pump is judged to be in fault;
s5, detecting and acquiring the static water pressure P after the water pump is closed and the water pressure is stable3；
S6, judging whether P is present3＜P2－ΔPYIn which Δ PYAnd the minimum threshold value represents the water pressure reduction after the water pump is shut down, if so, the water pump is judged to be normally shut down, and if not, the water pump is judged to be in fault.
2. The water flow safety detection method according to claim 1, characterized in that: in the water flowing process, whether abnormal water pressure P is stopped or not is detected and obtained4，P4＜P30－ΔPZIn which P is30Indicates the maximum water pressure value delta P in the water pressure stable time interval when the water pump worksZAnd the maximum value represents the maximum value of the reduction allowed by the water pressure when the water pump works normally, and if the maximum value is the maximum value, the water pump is judged to be abnormally closed in the running process.
3. A safety detecting device for water flow in a closed pipeline, which applies the safety detecting method for water flow in a closed pipeline according to any one of claims 1 to 4, wherein: comprises that
The Venturi tube (1) is arranged in the water flow pipeline;
the water pressure sensor (2) is arranged on the Venturi tube (1) and used for detecting the water pressure in the Venturi tube (1);
and the controller (3) is electrically connected with the water pressure sensor (2) and is used for receiving the water pressure signal transmitted by the water pressure sensor (2) and carrying out safety judgment and response control according to the water pressure signal.
4. The water flow safety detection device according to claim 3, wherein: the water pressure sensor (2) is arranged at the throat of the Venturi tube (1), at the position close to the throat on the contraction section of the Venturi tube (1) and/or on the inlet section of the Venturi tube (1).
5. The water flow safety detection device of claim 3, wherein: the alarm device also comprises an alarm (4) electrically connected with the controller (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810931791.8A CN110836746A (en) | 2018-08-16 | 2018-08-16 | Method and device for safely detecting water flow in closed pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810931791.8A CN110836746A (en) | 2018-08-16 | 2018-08-16 | Method and device for safely detecting water flow in closed pipeline |
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| CN110836746A true CN110836746A (en) | 2020-02-25 |
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| CN201810931791.8A Pending CN110836746A (en) | 2018-08-16 | 2018-08-16 | Method and device for safely detecting water flow in closed pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415225A (en) * | 2020-11-12 | 2021-02-26 | 中铁第一勘察设计院集团有限公司 | Method for judging water flow in water supply pipeline of passenger bolt |
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2018
- 2018-08-16 CN CN201810931791.8A patent/CN110836746A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112415225A (en) * | 2020-11-12 | 2021-02-26 | 中铁第一勘察设计院集团有限公司 | Method for judging water flow in water supply pipeline of passenger bolt |
| CN112415225B (en) * | 2020-11-12 | 2024-01-19 | 中铁第一勘察设计院集团有限公司 | Method for judging water flow in water supply pipeline of passenger plug |
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