CN202991568U - Main mine induced draft fan with air-volume online detection device - Google Patents
Main mine induced draft fan with air-volume online detection device Download PDFInfo
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- CN202991568U CN202991568U CN 201320003069 CN201320003069U CN202991568U CN 202991568 U CN202991568 U CN 202991568U CN 201320003069 CN201320003069 CN 201320003069 CN 201320003069 U CN201320003069 U CN 201320003069U CN 202991568 U CN202991568 U CN 202991568U
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- draft fan
- induced draft
- venturi tube
- air
- main mine
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Abstract
The utility model discloses a main mine induced draft fan with an air-volume online detection device, and the main mine induced draft fan comprises a main mine induced draft fan. The main mine induced draft fan is characterized in that the air outlet of an air duct of the main mine induced draft fan is connected with an upper Venturi tube through a flange, a positive pressure sampler of the Venturi tube is arranged in the middle part of a steady flow section of the Venturi tube, which is fixedly connected with the air outlet of the air duct of the main mine inducted draft fan, and a negative pressure sampler of the Venturi tube is arranged in the middle part of a dispersion section of the Venturi tube; and the positive pressure sampler and the negative pressure sampler are respectively connected to the end part of a transmission wire which is connected with a programmable logic controller (PLC) in a control cabinet. By adopting a calculation method of the Venturi tube, more accuracy for calculating the flow rate can be realized; and since online measurement is adopted, the measurement data is transmitted to a PLC control system at any time and displayed on a display device, the wind speed and the flow rate can be displayed and controlled at any time, and the ventilation quantity of a mine can be enabled to stay in the normal requirement range.
Description
Technical field
The utility model relates to a kind of improvement of mining main induced draft fan, specifically a kind of mining main induced draft fan with the air quantity on-line measuring device.
Background technique
In the coal mining mine, for the safety in production in colliery, must adopt mining main induced draft fan that the down-hole is ventilated, can its ventilation guarantee normal requirement, can directly have influence on the Security of production.The impact that the variation of ventilation is changed by the pressure reduction between well internal air pressure and barometric pressure.Therefore, in coal production, management unit requires will detect the air inducing amount of main induced draft fan, then adjusts as required the rotating speed of motor.At present, the method for measuring blower fan air inducing amount is: utilize wind gage to measure the wind speed of main induced draft fan air duct air outlet position, i.e. then distinguished and admirable flow velocity multiply by the section area of air duct air outlet position, namely gets flow.The deficiency of this method of measurement is: the one, and be inconsistent due to wind speed on the cross section of air duct, and what mostly measure when measuring is the wind speed of axial location, so the flow value inaccuracy of measuring is often bigger than normal; The 2nd, because being interrupted, measurement carries out, so can not detect at any time the variation of flow.By retrieval as can be known, measurement for flow, usually calculate according to the flow conservation principle in fluid mechanics, namely adopt Venturi measuring, flow with Venturi measuring wind, be generally used for the fields such as flue gas air channel, wind energy conversion system, boiler, pulverized coal burner, there is not yet the report of measuring for mining main induced draft fan ventilation.
Summary of the invention
The purpose of this utility model is to provide a kind of principle that adopts the Venturi measuring air quantity, can detect online at any time the mine ventilation flow, be beneficial in time to adjust motor speed, guarantee the mining main induced draft fan with air quantity on-line measuring device of ventilation in normal claimed range.
In order to reach above purpose, the technological scheme that the utility model adopts is: this is with the mining main induced draft fan of air quantity on-line measuring device, comprise mining main induced draft fan, it is characterized in that: connect Venturi tube by flange plate on described mining main induced draft fan air duct exhaust outlet, the positive pressure sampler of Venturi tube is located at the middle part of the steady flow segment that the air duct exhaust outlet of Venturi tube and mining main induced draft fan is fixedly connected, and the negative pressure sampler of Venturi tube is located at the middle part of the diffuser of Venturi tube; Positive pressure sampler and negative pressure sampler are connected to the end of the transmission line that is connected with PLC controller in control cabinet.
The utility model is also implemented by following measure: described Venturi tube is comprised of steady flow segment, frustum section and diffuser, all is being fixedly connected with by corresponding flange plate between steady flow segment and frustum section and between frustum section and diffuser; The inner diameter of steady flow segment is consistent with the inner diameter of mining main induced draft fan air duct exhaust outlet, and the length of steady flow segment is 30-50cm; The inner diameter of diffuser is greater than the inner diameter 20-40cm of steady flow segment, and the length of diffuser is 20-30cm; The length of frustum section is 10-20cm;
Flow rate calculation formula and the method for described Venturi tube can be calculated according to Bernoulli's equation, are prior art, as long as positive and negative pressure that will measure and corresponding section area substitution formula can obtain, therefore seldom state;
Described mining main induced draft fan comprises air duct, motor and fan, and motor and fan are contained in air duct, and this is known technology
The beneficial effects of the utility model are: measure flow velocity with present employing wind gage, then by comparing with the method for section area calculated flow rate, due to the computational methods that adopted Venturi tube, so that the calculating of flow is more accurate; Because this measurement is on-line measurement, its survey data is imported the PLC control system at any time into, and shows on display device, so can show at any time and the controlled wind speed flow, guarantees that the mine ventilation amount is in normal claimed range.
Description of drawings
Fig. 1 is structure schematic top plan view of the present utility model.
In figure: 1, main induced draft fan; 2, Venturi tube; 21, steady flow segment; 22, diffuser; 23, frustum section; 3, positive pressure sampler; 4, negative pressure sampler; 5, transmission line; 6 flange plate; 7, corresponding flange plate.
Embodiment
Make the utility model with reference to Fig. 1.This is with the mining main induced draft fan of air quantity on-line measuring device, comprise mining main induced draft fan 1, it is characterized in that: connect upper Venturi tube 2 by flange plate 6 on described mining main induced draft fan 1 air duct exhaust outlet, the positive pressure sampler 3 of Venturi tube 2 is located at the middle part of the steady flow segment 21 that the air duct exhaust outlet of Venturi tube 2 and mining main induced draft fan 1 is fixedly connected, and the negative pressure sampler 4 of Venturi tube 2 is located at the middle part of the diffuser 22 of Venturi tube 2; Positive pressure sampler 3 and negative pressure sampler 4 are connected to the end of the transmission line 5 that is connected with PLC controller in control cabinet.
As improvement of the present utility model: the PLC controller in described control cabinet is connected with display device with host computer by data line, do not mark in figure, host computer and display device are arranged in the control room, ground, the operator on duty can observe the variation of ventilation at any time, in time the rotating speed of motor is made adjustment, this is prior art.
Described Venturi tube 2 is comprised of steady flow segment 21, frustum section 23 and diffuser 22, all is being fixedly connected with by corresponding flange plate 7 between steady flow segment 21 and frustum section 23 and between frustum section 23 and diffuser 22, can be convenient to like this transportation and install; The inner diameter of steady flow segment 21 is consistent with the inner diameter of mining main induced draft fan 1 air duct exhaust outlet, and the length of steady flow segment 21 is 30-50cm, and like this, mining main induced draft fan 1 air-out flow can not be affected because Venturi tube 2 has been installed; The inner diameter of diffuser 22 is greater than the inner diameter 20-40cm of steady flow segment 21, and the length of diffuser 22 is 20-30cm; The length of frustum section 23 is 10-20cm;
The flow rate calculation formula of described Venturi tube 2 and method can be according to the Bernoulli's equation design calculation formulas, and this is prior art, as long as positive and negative pressure that will measure and corresponding section area substitution formula can obtain, therefore seldom state;
Described mining main induced draft fan 1 comprises air duct, motor and fan, and motor and fan are contained in air duct, and this is known technology.
Claims (2)
1. with the mining main induced draft fan of air quantity on-line measuring device, comprise mining main induced draft fan (1), it is characterized in that: pass through Venturi tube (2) in flange plate (6) connection on described mining main induced draft fan (1) air duct exhaust outlet, the positive pressure sampler (3) of Venturi tube (2) is located at the middle part of the steady flow segment (21) that the air duct exhaust outlet of Venturi tube (2) and mining main induced draft fan (1) is fixedly connected, and the negative pressure sampler (4) of Venturi tube (2) is located at the middle part of the diffuser (22) of Venturi tube (2); Positive pressure sampler (3) and negative pressure sampler (4) are connected to the end of the transmission line (5) that is connected with PLC controller in control cabinet.
2. the mining main induced draft fan with the air quantity on-line measuring device according to claim 1, it is characterized in that: described Venturi tube (2) is comprised of steady flow segment (21), frustum section (23) and diffuser (22), all is being fixedly connected with by corresponding flange plate (7) between steady flow segment (21) and frustum section (23) and between frustum section (23) and diffuser (22); The inner diameter of steady flow segment (21) is consistent with the inner diameter of mining main induced draft fan (1) air duct exhaust outlet, and the length of steady flow segment (21) is 30-50cm; The inner diameter of diffuser (22) is greater than the inner diameter 20-40cm of steady flow segment (21), and the length of diffuser (22) is 20-30cm; The length of frustum section (23) is 10-20cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003069 CN202991568U (en) | 2013-01-05 | 2013-01-05 | Main mine induced draft fan with air-volume online detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003069 CN202991568U (en) | 2013-01-05 | 2013-01-05 | Main mine induced draft fan with air-volume online detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202991568U true CN202991568U (en) | 2013-06-12 |
Family
ID=48562752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320003069 Expired - Fee Related CN202991568U (en) | 2013-01-05 | 2013-01-05 | Main mine induced draft fan with air-volume online detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202991568U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005974A (en) * | 2014-05-20 | 2014-08-27 | 北京工业大学 | Coal mine ventilation fan flow measuring method based on pressure correlation method |
| CN109209959A (en) * | 2017-07-06 | 2019-01-15 | 博西华电器（江苏）有限公司 | Kitchen ventilator and its series connection blower fan system, control method and connector, blower fan system |
-
2013
- 2013-01-05 CN CN 201320003069 patent/CN202991568U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104005974A (en) * | 2014-05-20 | 2014-08-27 | 北京工业大学 | Coal mine ventilation fan flow measuring method based on pressure correlation method |
| CN104005974B (en) * | 2014-05-20 | 2016-07-13 | 北京工业大学 | A kind of Coal Mine Ventilator flow-measuring method based on pressure correlation method |
| CN109209959A (en) * | 2017-07-06 | 2019-01-15 | 博西华电器（江苏）有限公司 | Kitchen ventilator and its series connection blower fan system, control method and connector, blower fan system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20140105 |