CN110975211A - Immersion type gauge pressure measuring method and device and intelligent fire hydrant - Google Patents
Immersion type gauge pressure measuring method and device and intelligent fire hydrant Download PDFInfo
- Publication number
- CN110975211A CN110975211A CN201911148724.XA CN201911148724A CN110975211A CN 110975211 A CN110975211 A CN 110975211A CN 201911148724 A CN201911148724 A CN 201911148724A CN 110975211 A CN110975211 A CN 110975211A
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- sensing unit
- pressure sensing
- fire hydrant
- pressure value
- absolute pressure
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/20—Hydrants, e.g. wall-hoses, wall units, plug-in cabinets
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/50—Testing or indicating devices for determining the state of readiness of the equipment
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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
Abstract
The invention discloses an immersion type gauge pressure measuring method, an immersion type gauge pressure measuring device and an intelligent fire hydrant, belongs to the technical field of fire hydrants, and is used for solving the technical problem that the existing gauge pressure measuring error is large; the absolute pressure sensing unit is used for measuring the absolute pressure inside the liquid; the air pressure sensing unit is used for detecting atmospheric pressure; when the water immersion sensing unit detects that the air pressure sensing unit is in a non-water immersion state, obtaining a gauge pressure value inside the liquid through an absolute pressure value measured by the absolute pressure sensing unit and an atmospheric pressure value measured by the air pressure sensing unit; when the water immersion sensing unit detects that the air pressure sensing unit is in a water immersion state, the controller acquires a local atmospheric pressure value through a public weather forecast network and combines the local atmospheric pressure value with an absolute pressure value to obtain a gauge pressure value inside the liquid. The technical scheme has the advantages of accurate and reliable measurement, simple structure and the like.
Description
Technical Field
The invention mainly relates to the technical field of fire hydrants, in particular to an immersion type gauge pressure measuring method, a measuring device and an intelligent fire hydrant.
Background
The pressures measured by the meters mainly include absolute pressure, atmospheric pressure, positive pressure (customarily called gauge pressure), negative pressure (customarily called vacuum), and differential pressure. Most of the measured pressure in engineering technology is gauge pressure, and under a certain condition, the measured pressure can indirectly obtain parameters such as temperature, flow, liquid level and the like. The liquid level, pressure value is typically measured as the gauge pressure of the liquid relative to the atmosphere. The current technical realization is that one end of the pressure sensing surface is contacted with the liquid level, and the other end of the pressure sensing surface is contacted with the atmosphere. The pressure core body carries out pressure sampling processing on the two pressure surfaces so as to obtain gauge pressure. Therefore, a pressure sensor for measuring gauge pressure must have a pressure sensing surface in contact with the atmosphere. For example, the pressure probe of the drop-in liquid level meter is dropped into the liquid container, and the other pressure sensing surface is led out of the liquid surface through a special cable with a vent pipe.
Along with the development of internet of things and smart city construction, liquid level and pressure need to be measured in many application scenarios, for example, liquid level measurement under a well lid, underground pipe network pressure measurement and the like. In these measurement applications, the equipment including the pressure sensing and data processing devices is often submerged in water, and the conventional pressure sensor must be installed outside the liquid container. If the devices cannot reliably prevent water, the devices can be damaged, but if the devices are prevented from water, the measured pressure value is always absolute pressure, and the actual absolute pressure value can change along with the change of the air pressure at the position of the sensor, so that the measured gauge pressure value is inaccurate, the deviation is large, the application of system data is influenced, and even adverse results are caused. For example, the water supply network dispatching system adjusts the water supply pressure of the booster pump station by taking the pressure as a reference, and if the actual pressure of the measuring point is smaller than the reading pressure, the booster pump will increase the pressure, possibly causing the rupture of the pipe network. If the actual liquid level is larger than the reading liquid level, the drainage device cannot be triggered to work, drainage is not timely, and waterlogging is easy to occur.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides an immersion type gauge pressure measuring method with accurate pressure detection, and correspondingly discloses a measuring device with simple structure and accurate pressure detection and an intelligent fire hydrant.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an immersion gauge pressure measurement method comprising the steps of:
s01, measuring the absolute pressure value inside the liquid to be detected, and detecting whether an air pressure sensing unit for detecting atmospheric pressure is in a water immersion state;
s02, when the atmospheric pressure sensing unit is detected to be in a non-water-immersion state, obtaining a gauge pressure value inside the liquid to be detected according to an absolute pressure value inside the liquid to be detected and an atmospheric pressure value measured by the atmospheric pressure sensing unit;
and when the air pressure sensing unit is detected to be in a water immersion state, the local atmospheric pressure value is obtained through a public weather forecast network, and the atmospheric pressure value is combined with the absolute pressure value to obtain the gauge pressure value inside the liquid to be detected.
The invention also discloses an immersion type gauge pressure measuring device which comprises a controller, an absolute pressure sensing unit, an air pressure sensing unit, a water immersion sensing unit and a power supply unit; the absolute pressure sensing unit and the air pressure sensing unit are connected with the controller; the power supply unit is connected with the controller, the absolute pressure sensing unit and the air pressure sensing unit and used for providing power supply; the absolute pressure sensing unit is arranged in the liquid to be measured and used for measuring the absolute pressure in the liquid; the air pressure sensing unit is used for detecting atmospheric pressure; the water immersion sensing unit is used for detecting whether the air pressure sensing unit is in a water immersion state or not; when the water immersion sensing unit detects that the air pressure sensing unit is in a non-water immersion state, the controller obtains a gauge pressure value inside the liquid to be measured through an absolute pressure value measured by the absolute pressure sensing unit and an atmospheric pressure value measured by the air pressure sensing unit; when the water immersion sensing unit detects that the air pressure sensing unit is in a water immersion state, the controller acquires a local atmospheric pressure value from a public weather forecast network and combines the local atmospheric pressure value with an absolute pressure value measured by the absolute pressure sensing unit to obtain a gauge pressure value inside the liquid to be measured.
As a further improvement of the above technical solution:
the absolute pressure sensing unit comprises a shell and an absolute pressure sensor, wherein the absolute pressure sensor is installed in the shell in a sealing mode, and a sensing surface is in contact with liquid.
The absolute pressure sensor is connected with the controller through a non-air-guide tube and a signal cable.
The power supply unit comprises a lithium sub-battery and a UPS power supply module.
The air pressure sensing unit comprises an air pressure sensor, and a breathing membrane of the air pressure sensor is a waterproof breathable membrane.
The invention also discloses an intelligent fire hydrant, which comprises a fire hydrant body, a valve rod assembly and a fire hydrant cap, wherein the valve rod assembly is arranged in the fire hydrant body; and a controller and a gas pressure sensing unit in the immersed gauge pressure measuring device are arranged in the fire hydrant cap, and the absolute pressure sensing unit is arranged on the valve rod assembly.
As a further improvement of the above technical solution:
the valve rod assembly comprises a valve rod, a valve plate assembly, a flange plate, a screw rod and a switch handle; the fire hydrant comprises a fire hydrant body, a flange plate, a sealing bearing, a switch handle and a valve plate assembly, wherein the flange plate is installed on the fire hydrant body, the sealing bearing is installed on the flange plate, one end of the switch handle penetrates through the sealing bearing on the flange plate and then is in threaded connection with a lead screw, the other end of the lead screw is connected with one end of a valve rod, and the other end of the valve rod is connected with the valve.
The valve plate assembly comprises a connecting part, a valve plate and a sealing layer; one end of the connecting portion is connected with the valve rod, the other end of the connecting portion is connected with the valve plate, a sealing layer is installed on a sealing surface of the valve plate, and the absolute pressure sensor is encapsulated in the sealing layer through resin adhesive, and a pressure sensing surface of the absolute pressure sensor is in contact with the external environment.
The fire hydrant cap is hermetically arranged on the flange plate, and a waterproof and breathable breather valve is arranged on the fire hydrant cap.
Compared with the prior art, the invention has the advantages that:
the immersion type gauge pressure measuring device can realize accurate measurement of the internal pressure of the liquid to be measured through the organic combination of the absolute pressure sensing unit and the air pressure sensing unit, and has simple structure and easy realization.
According to the immersion type gauge pressure measuring device, the water immersion state of the air pressure sensing unit is detected through the water immersion sensing unit, when the water immersion sensing unit detects that the air pressure sensing unit is in the water immersion state, namely the air pressure sensing unit cannot accurately detect the atmospheric pressure, the controller acquires the local atmospheric pressure value through the common weather forecast network, and the local atmospheric pressure value is combined with the absolute pressure value measured by the absolute pressure sensing unit to obtain the gauge pressure value inside the liquid, so that the accuracy of pressure detection is further improved.
The intelligent fire hydrant of the invention has the advantages of the immersed gauge pressure measuring device, ensures the accurate measurement of the water pressure in the water supply pipe network, realizes the constancy of the water supply pressure, and has simple integral structure and easy realization.
Drawings
Fig. 1 is a block diagram of a measuring apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram of an embodiment of a measuring device in an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an intelligent fire hydrant in an embodiment of the invention.
Fig. 4 is a schematic view of an absolute pressure sensing unit installation structure in the embodiment of the present invention.
The reference numbers in the figures denote: 1. a controller; 101. a box body; 2. an absolute pressure sensing unit; 3. an air pressure sensing unit; 4. a water immersion sensing unit; 5. a power supply unit; 6. a sensor conditioning circuit; 7. a data acquisition circuit; 8. a communication module; 9. a cloud server; 10. a hydrant body; 11. a valve stem assembly; 1101. a valve stem; 1102. a valve plate assembly; 11021. a connecting portion; 11022. a valve plate; 11023. a sealing layer; 1103. a flange plate; 1104. a screw rod; 1105. a switch handle; 12. fire hydrant cap.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
The immersion gauge pressure measuring method of the embodiment comprises the following steps:
s01, measuring the absolute pressure value inside the liquid to be detected, and detecting whether the air pressure sensing unit 3 for detecting the atmospheric pressure is in a water immersion state;
s02, when the atmospheric pressure sensing unit 3 is detected to be in a water-free state, obtaining a gauge pressure value inside the liquid to be detected according to an absolute pressure value inside the liquid to be detected and an atmospheric pressure value measured by the atmospheric pressure sensing unit 3;
when the air pressure sensing unit 3 is detected to be in a water immersion state, the local atmospheric pressure value is obtained through a public weather forecast network (with a public inquiry port), and the local atmospheric pressure value is combined with the absolute pressure value to obtain the gauge pressure value inside the liquid to be detected.
As shown in fig. 1 and 2, the immersion gauge pressure measuring apparatus of the present embodiment includes a controller 1, an absolute pressure sensing unit 2, an air pressure sensing unit 3, and a power supply unit 5; wherein, the absolute pressure sensing unit 2 and the air pressure sensing unit 3 are both connected with the controller 1; the power supply unit 5 is connected with the controller 1, the absolute pressure sensing unit 2 and the air pressure sensing unit 3 and is used for providing power supplies for the controller 1 and each sensing unit; the absolute pressure sensing unit 2 is arranged in the liquid to be measured and used for measuring the absolute pressure in the liquid; the air pressure sensing unit 3 is used for detecting atmospheric pressure; the controller 1 obtains a gauge pressure value inside the liquid (where the gauge pressure value = absolute pressure value — atmospheric pressure value) from an absolute pressure value measured by the absolute pressure sensing unit 2 and an atmospheric pressure value measured by the atmospheric pressure sensing unit 3. The immersion type gauge pressure measuring device can realize accurate measurement of the internal pressure of the liquid to be measured through the organic combination of the absolute pressure sensing unit 2 and the air pressure sensing unit 3, and has simple structure and easy realization.
In this embodiment, the device further includes a water immersion sensing unit 4 (such as a water immersion sensor) for detecting whether the air pressure sensing unit 3 (such as an air pressure sensor) is in a water immersion state; when the water immersion sensing unit 4 detects that the air pressure sensing unit 3 is in a water-free state, the controller 1 obtains a gauge pressure value inside the liquid through an absolute pressure value measured by the absolute pressure sensing unit 2 and an atmospheric pressure value measured by the air pressure sensing unit 3; when the water immersion sensing unit 4 detects that the air pressure sensing unit 3 is in a water immersion state, namely the air pressure sensing unit 3 cannot accurately detect the atmospheric pressure at the moment, the controller 1 acquires a local atmospheric pressure value through a public weather forecast network (provided with a public query port, and can realize historical atmospheric pressure or real-time atmospheric pressure query through networking), and the local atmospheric pressure value is combined with an absolute pressure value measured by the absolute pressure sensing unit 2 to obtain a gauge pressure value inside the liquid. Through the detection to 3 water logging states of atmospheric pressure sensing unit, can further improve pressure detection's accuracy. This kind of situation is applied to the occasion that can't obtain atmospheric pressure through atmospheric pressure sensing unit 3 accurately mostly, for example when being applied to inside the various inspection shafts, atmospheric pressure sensing unit 3 exists the condition of water logging.
As shown in fig. 1, in a specific embodiment, the system further includes a sensor conditioning circuit 6, a data acquisition circuit 7, and a communication module 8; the sensor conditioning circuit 6 is connected with the absolute pressure sensing unit 2 and the air pressure sensing unit 3 and is used for carrying out digital conversion on data of each sensing unit; the data acquisition circuit 7 is respectively connected with the water immersion sensing unit 4, the data acquisition circuit 7 and the controller 1, and is used for acquiring data of each sensing unit and sending the data to the controller 1. In addition, the controller 1 acquires a local atmospheric pressure value to the cloud server 9 through the communication module 8, wherein the cloud server 9 has a weather forecast data interface and is connectable to a public weather forecast network. In addition, the power supply unit 5 preferably adopts a long-acting lithium secondary battery, is combined with a low-power-consumption hardware design, has long service life, and is also provided with a UPS power supply module to realize the reliability of power supply; external power supply may also be employed where power supply conditions permit. Wherein sensor conditioning circuit 6, data acquisition circuit 7, water logging sensor, controller 1, communication module 8, power supply unit 5 constitute intelligent sensor terminal, encapsulate in sealed box body 101. When the inspection well is applied to the inside of an inspection well, as shown in fig. 2, the box body 101 is installed on the side wall of the upper part of the inspection well, and the air pressure sensor and the water sensor are installed on the box body 101, of course, the air pressure sensor can also be installed in the box body 101 and is contacted with the atmosphere outside the box body 101 through a waterproof and breathable breather valve; the absolute pressure sensor is placed at the bottom of the inspection well, the absolute pressure sensing unit 2 comprises a shell and an absolute pressure sensor, the absolute pressure sensor is hermetically arranged in the shell, and a sensing surface of the absolute pressure sensor is in contact with liquid and used for sensing the liquid pressure; the absolute pressure sensor is led into the box body 101 through a common signal cable without an air duct, and the interface between the cable and the box body 101 is sealed by adopting an IP68 process; compared with the traditional immersion type pressure sensor with the ventilating pipe, the wire rod cost can be saved.
The immersed gauge pressure measuring device can be applied to the inside of an inspection well as shown in figure 2, and can also be applied to the measurement of the water pressure of a water supply pipe network in a fire hydrant to form an intelligent fire hydrant for accurately measuring the liquid pressure, as shown in figure 3, the intelligent fire hydrant specifically comprises a fire hydrant body 10, a valve rod assembly 11 and a fire hydrant cap 12, wherein the valve rod assembly 11 is arranged in the fire hydrant body 10, and the fire hydrant cap 12 is hermetically arranged on the upper end surface of the fire hydrant body 10, and further comprises the immersed gauge pressure measuring device; the controller 1 and the air pressure sensing unit 3 in the immersed gauge pressure measuring device are installed in the hydrant cap 12, and the absolute pressure sensing unit 2 (absolute pressure sensor) is installed on the valve stem assembly 11. The intelligent fire hydrant of the invention has the advantages of the immersed gauge pressure measuring device, ensures the accurate measurement of the water pressure in the water supply pipe network, realizes the constancy of the water supply pressure, and has simple integral structure and easy realization.
In this embodiment, the valve stem assembly 11 includes a valve stem 1101, a valve plate assembly 1102, a flange 1103, a lead screw 1104 and a switch handle 1105; the flange plate 1103 is installed on the fire hydrant body 10, the flange plate 1103 is provided with a sealing bearing and is sleeved on the switch handle 1105, namely, one end of the switch handle 1105 passes through the sealing bearing on the flange plate 1103 and then is in threaded connection with the screw rod 1104 (the upper end of the screw rod 1104 is a threaded sleeve, one end of the switch handle 1105 is an external thread and is in threaded connection with the threaded sleeve), the other end of the screw rod 1104 is connected with one end of the valve rod 1101, and the other end of the valve rod 1101 is connected with the valve plate assembly 1102; valve plate assembly 1102 includes a connection portion 11021, a valve plate 11022, and a sealing layer 11023; one end of the connecting part 11021 is connected with the other end of the valve rod 1101, the other end of the connecting part 11021 is connected with the valve plate 11022, and a sealing layer 11023 is installed on the sealing surface of the valve plate 11022 and used for being matched with a retaining ring inside the fire hydrant body 10 to achieve opening and closing of the fire hydrant; the absolute pressure sensor is encapsulated in the sealing layer 11023 through resin adhesive, the pressure sensing surface is in contact with the external environment, and the absolute pressure sensor is connected with an intelligent sensor terminal in the fire hydrant cap 12 through a common signal cable, as shown in fig. 4. In addition, the fire hydrant cap 12 is hermetically mounted on the flange plate 1103, and the fire hydrant cap 12 is provided with a waterproof and breathable air pressure breather valve for communicating with the external environment, so that the air pressure sensor can accurately detect the atmospheric pressure in real time. When the switch handle 1105 rotates, the screw sleeve of the screw rod 1104 rotates to drive the screw rod 1104 to move up and down, so that the valve plate 11022 at the lower end of the screw rod 1104 is separated from or contacted with a retaining ring in the fire hydrant body 10, and the fire hydrant is switched on and off.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. An immersion gauge pressure measurement method, comprising the steps of:
s01, measuring the absolute pressure value inside the liquid to be detected, and detecting whether the air pressure sensing unit (3) for detecting the atmospheric pressure is in a water immersion state;
s02, when the atmospheric pressure sensing unit (3) is detected to be in a non-water-immersed state, obtaining a gauge pressure value inside the liquid to be detected according to an absolute pressure value inside the liquid to be detected and an atmospheric pressure value measured by the atmospheric pressure sensing unit (3);
when the air pressure sensing unit (3) is detected to be in a water immersion state, the local atmospheric pressure value is obtained through a public weather forecast network, and the atmospheric pressure value is combined with the absolute pressure value to obtain the gauge pressure value inside the liquid to be detected.
2. An immersion gauge pressure measuring device is characterized by comprising a controller (1), an absolute pressure sensing unit (2), an air pressure sensing unit (3), a water immersion sensing unit (4) and a power supply unit (5); the absolute pressure sensing unit (2) and the air pressure sensing unit (3) are connected with the controller (1); the power supply unit (5) is connected with the controller (1), the absolute pressure sensing unit (2) and the air pressure sensing unit (3) and is used for providing a power supply; the absolute pressure sensing unit (2) is arranged in the liquid to be measured and used for measuring the absolute pressure in the liquid; the air pressure sensing unit (3) is used for detecting atmospheric pressure; the water immersion sensing unit (4) is used for detecting whether the air pressure sensing unit (3) is in a water immersion state or not; when the water immersion sensing unit (4) detects that the air pressure sensing unit (3) is in a non-water immersion state, the controller (1) obtains a gauge pressure value inside the liquid to be measured through an absolute pressure value measured by the absolute pressure sensing unit (2) and an atmospheric pressure value measured by the air pressure sensing unit (3); when the water immersion sensing unit (4) detects that the air pressure sensing unit (3) is in a water immersion state, the controller (1) obtains a local atmospheric pressure value through a public weather forecast network, and the local atmospheric pressure value is combined with an absolute pressure value measured by the absolute pressure sensing unit (2) to obtain a gauge pressure value inside the liquid to be measured.
3. Immersion gauge pressure measuring device according to claim 2, characterized in that the absolute pressure sensing unit (2) comprises a housing and an absolute pressure sensor, which is sealingly mounted in the housing and the sensing surface is in contact with the liquid.
4. Immersion gauge pressure measuring device according to claim 3, characterized in that the absolute pressure sensor is connected to the controller (1) by a non-gas-conducting tube and a signal cable.
5. Immersion gauge pressure measuring device according to claim 2 or 3 or 4, characterized in that the power supply unit (5) comprises a lithium sub-battery and a UPS power supply module.
6. The submersion gauge pressure measuring apparatus according to claim 2, 3 or 4, wherein the air pressure sensing unit (3) includes an air pressure sensor, and a waterproof and breathable membrane is used as a breathing membrane of the air pressure sensor.
7. An intelligent fire hydrant, comprising a fire hydrant body (10), a valve stem assembly (11) and a fire hydrant cap (12), said valve stem assembly (11) being mounted in said fire hydrant body (10), said fire hydrant cap (12) being mounted on an upper end surface of said fire hydrant body (10), characterized by further comprising an immersed gauge pressure measuring device according to any one of claims 2 to 6; a controller (1) and an air pressure sensing unit (3) in the immersed gauge pressure measuring device are installed in the fire hydrant cap (12), and the absolute pressure sensing unit (2) is installed on the valve rod assembly (11).
8. The intelligent fire hydrant in claim 7, wherein the valve rod assembly (11) comprises a valve rod (1101), a valve plate assembly (1102), a flange plate (1103), a lead screw (1104) and a switch handle (1105); the fire hydrant comprises a fire hydrant body (10), a flange plate (1103) and a sealing bearing, wherein the flange plate (1103) is provided with the sealing bearing, one end of a switch handle (1105) penetrates through the sealing bearing on the flange plate (1103) and then is in threaded connection with a screw rod (1104), the other end of the screw rod (1104) is connected with one end of a valve rod (1101), and the other end of the valve rod (1101) is connected with a valve plate assembly (1102).
9. The smart hydrant in claim 8, wherein the valve plate assembly (1102) includes a connection portion (11021), a valve plate (11022), and a sealing layer (11023); one end of the connecting portion (11021) is connected with the valve rod (1101), the other end of the connecting portion is connected with a valve plate (11022), a sealing layer (11023) is installed on the sealing surface of the valve plate (11022), the absolute pressure sensor is encapsulated in the sealing layer (11023) through resin adhesive, and a pressure sensing surface is in contact with the external environment.
10. The intelligent fire hydrant according to claim 9, wherein the fire hydrant cap (12) is hermetically mounted on the flange plate (1103), and a waterproof and breathable breather valve is mounted on the fire hydrant cap (12).
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| CN201911148724.XA CN110975211A (en) | 2019-11-21 | 2019-11-21 | Immersion type gauge pressure measuring method and device and intelligent fire hydrant |
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| CN201911148724.XA CN110975211A (en) | 2019-11-21 | 2019-11-21 | Immersion type gauge pressure measuring method and device and intelligent fire hydrant |
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Application publication date: 20200410 |