CN218953374U - Air duct air supply state detection device - Google Patents
Air duct air supply state detection device Download PDFInfo
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- CN218953374U CN218953374U CN202223273809.0U CN202223273809U CN218953374U CN 218953374 U CN218953374 U CN 218953374U CN 202223273809 U CN202223273809 U CN 202223273809U CN 218953374 U CN218953374 U CN 218953374U
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- differential pressure
- air duct
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- pressure sensor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The utility model discloses a detection device for the air supply state of an air duct, which comprises a differential pressure sensor and a detection unit, wherein the positive pressure end of the differential pressure sensor is arranged in the air duct, the negative pressure end of the differential pressure sensor is arranged outside the air duct, the differential pressure sensor detects the internal and external differential pressure signals of the air duct, the internal and external differential pressure signals are input into the detection unit, and the detection unit judges the air supply state of the air duct according to the differential pressure signals. The problems of physical problems of underground cement spraying, dust accumulation, water vapor erosion and the like are solved, the failure rate of detection equipment is reduced, and the problem of abnormal detection of the air supply state is solved.
Description
Technical Field
The utility model relates to the field of detection of air supply states in mines, in particular to a device for detecting an air supply state of an air duct.
Background
In underground works such as coal mining, ventilation by a ventilation duct is required in a roadway. The air supply state of the air duct is particularly important for safe operation. In the prior art, the air supply state of the air duct is detected through various modes, including (1) a mode of adopting a mechanical ejector pin switch, (2) a mode of magnetic induction detection and (3) a mode of detecting an acceleration sensor.
(1) The mechanical thimble switch structurally adopts a clamp mode, a mechanical switch base is arranged on the mechanical thimble switch, and a thimble is arranged below the mechanical thimble switch. When the flexible air duct is windy, the air duct can expand, when the air duct is windless, the air duct can be contracted, and the distance between the mechanical ejector pin and the upper switch base can be changed under two states, so that the mechanical switch is turned on or off. The state of the air duct switch is known by detecting the on or off state of the mechanical switch.
The mechanical switch mode can generate mechanical fatigue and element rust after being used for a long time, and the detection function is lost, so that the detection abnormality is caused.
(2) Application number CN201420723455.1 discloses a mining magnetic induction wind barrel sensor, which adopts a magnetic induction detection mode. Structurally, the clamp is adopted. The magnet is placed while the magnetic induction element (reed switch, hall element, etc.) is placed. When the flexible air duct is windy, the air duct can expand, when the air duct is windless, the physical distance between the magnet end and the detection end can be changed in two states, the reed switch can be changed in two states of actuation and disconnection, and the Hall element corresponds to the induction signal and can be changed. The on-off state of the air duct is known by detecting the on-off state of the reed switch; the switch state of the air duct is known by detecting the voltage variation of the Hall element.
The mechanical structure is very inconvenient in the field application process, because the field can spray the slurry in real time, once the slurry is sprayed onto the mechanical structure, the detection device can be fixed by cement spraying, the detection function is lost, and the detection abnormality is caused.
(3) Publication number CN106370148A discloses a device and a method for detecting the air supply state of a flexible air duct based on an acceleration sensor, wherein the method adopts the detection mode of the acceleration sensor. Structurally, the flexible encircling type wind tunnel is characterized in that two acceleration sensors are used for being respectively arranged on two sides of the wind tunnel, the wind tunnel can expand when wind exists, the wind tunnel can be contracted when no wind exists, the angle detected by the two acceleration sensors can be changed, and whether the wind tunnel exists or not can be detected by measuring the angle change.
Disclosure of Invention
The utility model solves the physical problems of underground cement spraying, dust accumulation, water vapor erosion and the like, reduces the failure rate of detection equipment and reduces the problem of abnormal detection of the air supply state.
The implementation principle of the utility model is as follows: under the condition that the air quantity is the same, the air speed of the place with the small section is larger than the air speed of the place with the large section, the positive pressure end of the differential pressure element is placed at the place with the small section, the negative pressure end of the differential pressure element is placed at the place with the large section, the sensor can generate differential pressure, and the differential pressure value is in direct proportion to the air flow velocity. And setting a differential pressure threshold value for the sensor, judging that the air duct is windy when the detection value is larger than the threshold value, and judging that the air duct is windless when the detection value is smaller than the threshold value.
In view of this, the technical scheme adopted by the utility model is as follows: the air supply state detection device of the air duct comprises a differential pressure sensor and a detection unit, wherein the positive pressure end of the differential pressure sensor is arranged in the air duct, the negative pressure end of the differential pressure sensor is arranged outside the air duct, the differential pressure sensor detects internal and external differential pressure signals of the air duct, the internal and external differential pressure signals are input into the detection unit, and the detection unit judges the air supply state of the air duct according to the differential pressure signals.
Further, the positive pressure end of the differential pressure sensor is connected with one end of a hose, and the other end of the hose is placed in the air duct.
Further, the differential pressure sensor is arranged in the roadway. The whole detection device can be placed randomly, and the device is more convenient to arrange on site.
Further, the detecting unit judges the magnitude of the pressure difference signal and the threshold value, if the pressure difference signal is larger than the threshold value, wind exists in the air duct, and if the pressure difference signal is smaller than or equal to the threshold value, no wind exists in the air duct.
The utility model originally adopts a mode that the two ends of the differential pressure element are respectively arranged on the sections with different sizes to generate differential pressure values under the condition that the air quantity is the same, so as to judge whether the air duct has air or not.
The utility model can insert the positive pressure end into the air duct through a hose, and the detection device can be placed at will, so that the detection device is not limited to be placed above the air duct or bound on the air duct. Can be according to the scene demand, neither shelter from the pedestrian again installation dismantlement convenience. Meanwhile, the problem that the sensor detects abnormality caused by underground cement spraying, dust accumulation and water vapor erosion is solved.
Drawings
FIG. 1 is a schematic diagram of the present utility model;
FIG. 2 is a cross-sectional view of the duct and tunnel of the present utility model;
in the figure, a 1-differential pressure sensor, a 1-1-negative pressure end, a 1-2-positive pressure end, a 2-hose, a 3-air duct, a 3-roadway and a 4-detection unit.
Detailed Description
The air supply state detection device of the air duct comprises a differential pressure sensor 1 and a detection unit 4, wherein a positive pressure end 1-2 of the differential pressure sensor 1 is placed in the air duct, a negative pressure end 1-1 of the differential pressure sensor 1 is placed outside the air duct 3, the differential pressure sensor 1 detects internal and external differential pressure signals of the air duct, the internal and external differential pressure signals are input into the detection unit 4, and the detection unit 4 judges the air supply state of the air duct according to the differential pressure signals.
The positive pressure end 1-2 of the differential pressure sensor 1 is connected with one end of a hose 2, and the other end of the hose 2 is arranged in an air duct 3. The hose can be inserted through a hole on the side wall of the air duct, and can also be arranged at an air outlet of the air duct.
The differential pressure sensor 1 is arranged at any position in the roadway 3.
The detection unit 4 judges the magnitude of the pressure difference signal and the threshold value, if the pressure difference signal is larger than the threshold value, wind exists in the air duct, and if the pressure difference signal is smaller than or equal to the threshold value, no wind exists in the air duct. The threshold is at least 8.
The above solution may further comprise a power module connected to the detection unit 4 for powering the detection unit 4. And a display unit connected to the detection unit 4 for displaying the detection result and the like. And an alarm unit connected with the detection unit 4, and when detecting no wind in the wind barrel, an alarm signal is sent out, for example, an alarm sound is sent out or an alarm signal lamp is turned on.
The differential pressure sensor can be realized by selecting products which are available in the market. The detection unit can be realized by a singlechip, and the singlechip is a commercially available chip.
The feasibility of the utility model is demonstrated below in connection with fig. 1 and 2: section of wind tunnelThe product formula: s is S 1 ＝π*R 1 2 Wherein R is 1 Is the effective radius of the wind tunnel;
roadway sectional area formula: s is S 2 ＝π*R 2 2 Wherein R is 2 The effective radius of the roadway;
in a single-head tunneling roadway, the air quantity flowing through the air duct is equal to the air quantity returned by the roadway, and the flow velocity in the air duct is assumed to be V 1 The flow velocity in the roadway is V 2 The following formula is given:
S 1 *V 1 ＝(S 2 -S 1 )*V 2 (equation 1)
Then: pi R 1 2 *V 1 ＝(π*R 2 2 -π*R 1 2 )*V 2 (equation 2)
In an actual field situation: roadway radius R 2 At least 3 times of the radius R of the air duct 1 ：
Then it is deduced from "equation 2": v (V) 1 ≧8V 2 。
The kinetic energy of wind speed acts on the differential pressure element end and can be directly converted into pressure energy, and the larger the wind speed kinetic energy is, the larger the pressure value is generated. The positive pressure end and the negative pressure end of the differential pressure sensor have different pressure values due to different flow rates, so that differential pressure can be generated. The differential pressure value is proportional to the wind flow velocity.
And flexibly setting a differential pressure value threshold according to the actual situation of the site, judging that the equipment is windy when the wind flow exists in the wind cylinder and the detected differential pressure value is larger than the threshold value, and judging that the equipment is windless when the wind flow is lower than the threshold value.
Claims (5)
1. Dryer air feed state detection device, its characterized in that: the air supply device comprises a differential pressure sensor and a detection unit, wherein the positive pressure end of the differential pressure sensor is arranged in an air duct, the negative pressure end of the differential pressure sensor is arranged outside the air duct, the differential pressure sensor detects internal and external differential pressure signals of the air duct, the internal and external differential pressure signals are input into the detection unit, and the detection unit judges the air supply state of the air duct according to the differential pressure signals.
2. The duct supply status detection apparatus of claim 1, wherein: the positive pressure end of the differential pressure sensor is connected with one end of a hose, and the other end of the hose is placed in the air duct.
3. The duct supply status detection apparatus according to claim 2, wherein: the differential pressure sensor is arranged in the roadway.
4. A duct air supply condition detection apparatus according to claim 1 or 2 or 3, wherein: the detection unit judges the magnitude of the pressure difference signal and the threshold value, if the pressure difference signal is larger than the threshold value, wind exists in the air duct, and if the pressure difference signal is smaller than or equal to the threshold value, no wind exists in the air duct.
5. The device for detecting the air supply state of an air duct according to claim 4, wherein: the threshold is at least 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223273809.0U CN218953374U (en) | 2022-12-07 | 2022-12-07 | Air duct air supply state detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223273809.0U CN218953374U (en) | 2022-12-07 | 2022-12-07 | Air duct air supply state detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218953374U true CN218953374U (en) | 2023-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223273809.0U Active CN218953374U (en) | 2022-12-07 | 2022-12-07 | Air duct air supply state detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218953374U (en) |
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2022
- 2022-12-07 CN CN202223273809.0U patent/CN218953374U/en active Active
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