CN203702218U - Real-time measurement display device installation structure for air volume of air cave - Google Patents

Abstract

The utility model discloses a real-time measurement display device installation structure for the air volume of an air cave. The real-time measurement display device installation structure for the air volume of the air cave comprises an air returning well, the air cave and an air volume detection instrument. The section area of a roadway of the air cave is gradually reduced in the moving direction of the air flow in the air cave, and the rear end of the roadway is connected with a main mine ventilator. The air volume detection instrument is provided with two air pressure detection pipelines, wherein one end of one air pressure detection pipeline is connected to the air volume detection instrument, the other end of one air pressure detection pipeline extends into the roadway and is arranged on the front probe point of the roadway, one end of the other air pressure detection pipeline is connected to the air volume detection instrument, and the other end of the other air pressure detection pipeline extends into the roadway and is arranged on the rear probe point of the roadway. The directions of the openings of the portions, extending into the roadway, of pipe bodies of the two air pressure detection pipelines are perpendicular to the moving direction of the air flow in the air cave. The real-time measurement display device installation structure for the air volume of the air cave can achieve real-time on-line measurement of the air volume in the air cave easily, and numerical reading is visual and convenient.

Description

A kind of wind cave air quantity real time measure display unit installing structure

Technical field

The utility model belongs to mine detection technique field, is specifically related to a kind of wind cave air quantity real time measure display unit installing structure.

Background technology

Mine main ventilator is one of vital equipment of coal production, shoulders to delivered downhole fresh air and takes away the effect of pernicious gas.The operation condition performance parameter of monitoring blower fan is regular management work, and owing to being subject to the restriction of the odjective causes such as coal production condition, mine main ventilator air quantity is the parameter of more difficult measurement always, particularly the long term monitoring precision instability problem of real-time online.Therefore short time or the provisional dispersion method one class detection means of adopting, the measuring method of air quantity is with various vane-type wind tables and Pitot tube mensuration more.While adopting wind table to measure the mean wind speed of certain section in main return airway, because required time is long, labour intensity is large, and poor working environment also can cause larger measuring and calculating error, is abandoned gradually; The measuring method of Pitot tube principle is not suitable for long-term real time on-line monitoring under the such condition of blower fan wind cave.In order to improve and solve the problem of existing method existence, engineers and technicians and scholar expert did a large amount of study on monitoring work, as ventilator diffuser place installation frame binding wind table or Sensor monitoring method, but exist all the time for a long time the technical barrier that cannot go beyond: the real time on-line monitoring technological difficulties of stability, precision reliability.Mine main ventilator air quantity is the important parameter of mine ventilation system, most important for the scientific management of mine ventilation.In order to find a kind of desirable effective ways of being convenient to mine ventilation fan delivery real time on-line monitoring, carry out the theoretical and experimental study of this respect, in conjunction with the professional knowledge of measuring instrument development aspect, monitoring method and instrument Development Techniques for mine main ventilator airflow pressure are proposed, to meet the needs of mine ventilation management.

Utility model content

For the above-mentioned technical problem existing in prior art, the utility model proposes a kind of wind cave air quantity real time measure display unit installing structure, not only can ensure the inner air quantity of wind cave to carry out real-time online detection, and air quantity intuitive display is convenient.

To achieve these goals, the utility model adopts following technical scheme:

A kind of wind cave air quantity real time measure display unit installing structure, comprise returnairshaft, wind cave and air volume test instrument, move towards direction along wind cave internal gas flow, one section of tunnel section area of wind cave is tendencies toward shrinkage gradually, rear end in this section of tunnel is connected with mine main ventilator, in described air volume test instrument, be provided with two blast signal pipings, wherein one end of a blast signal piping is connected in air volume test instrument, the other end stretches into inside, described tunnel and is arranged on sensing point place before tunnel, one end of another blast signal piping is connected in air volume test instrument, the other end stretches into inside, described tunnel and is arranged on sensing point place behind tunnel, article two, all to move towards direction vertical with wind cave internal gas flow for the body portion opening direction that blast signal piping stretches into inside, described tunnel.

Further, before described tunnel, behind sensing point and tunnel, the distance between sensing point is 3～5m, and the distance behind tunnel between sensing point and mine main ventilator is 2～3m.

Further, described blast signal piping comprises an emulsion tube, connects respectively a copper pipe joint in two ends of emulsion tube, and one of them copper pipe joint is plugged in air volume test instrument, and another copper pipe joint stretches into inside, described tunnel.

Further, the external diameter of described copper pipe joint is 6～8mm, and the internal diameter of copper pipe joint is 1～3mm.

Further, the rounded shape in cross section, described tunnel or square shape.

The utility model has the advantages that:

The utility model is chosen two detecting locations by being at the inner a certain section of section area of wind cave in the tunnel of tendencies toward shrinkage gradually, adopt air volume test instrument to detect the pressure of two detecting locations, because the pressure ratio of two detecting locations is easier to obtain, and according to law of conservation of energy and fluid Bernoulli equation and the inner air force of mine ventilation calculating air-out cave, realize the real time on-line monitoring to the inner air quantity of wind cave, reading intuitive and convenient.Utilize air volume test instrument to detect and can overcome easily icing deficiency of the U-shaped water column meter in cold district in winter air quantity.

Brief description of the drawings

Fig. 1 is the schematic diagram of a kind of wind cave air quantity real time measure display unit installing structure in the utility model.

Detailed description of the invention

Below in conjunction with accompanying drawing and detailed description of the invention, the utility model is described in further detail:

Shown in Fig. 1, a kind of wind cave air quantity real time measure display unit installing structure, comprises returnairshaft 1, wind cave 2 and air volume test instrument 3.

Move towards A direction along wind cave internal gas flow, one section of tunnel 20 section area of wind cave are tendencies toward shrinkage gradually, preferably, and these tunnel 20 rounded shape in cross section or square shapes.Be connected with mine main ventilator 4 in the rear end in this section of tunnel 20, in air volume test instrument 3, be provided with two blast signal pipings, wherein one end of a blast signal piping is connected in air volume test instrument, the other end stretches into inside, described tunnel and is arranged on sensing point B place before tunnel, one end of another blast signal piping is connected in air volume test instrument, the other end stretches into inside, described tunnel and is arranged on sensing point C place behind tunnel, before tunnel, behind sensing point B and tunnel, the distance d1 between sensing point C is 3～5m, distance d2 behind tunnel between sensing point C and mine main ventilator is 2～3m, article two, all to move towards A direction vertical with wind cave internal gas flow for the body portion opening direction that blast signal piping stretches into 20 inside, tunnel.

Blast signal piping comprises an emulsion tube 5, connects respectively a copper pipe joint 60,61 in two ends of emulsion tube, and one of them copper pipe joint 60 is plugged in air volume test instrument 3, and another copper pipe joint 61 stretches into 20 inside, tunnel.The lateral wall of copper pipe joint is Bamboo-shaped, is beneficial to realize copper pipe joint and be connected with the firm of emulsion tube 5.The external diameter of copper pipe joint is 6～8mm, and the internal diameter of copper pipe joint is 1～3mm.

Before tunnel, sensing point B cross section is between sensing point C cross section behind tunnel, and the energy equation of distinguished and admirable fluid is expressed as:

W ₁＝W ₂+P _z（1）

In formula (1), W ₁, W ₂represent respectively behind sensing point B before tunnel, tunnel the distinguished and admirable total energy having on sensing point C cross section; P _zrepresent the distinguished and admirable energy loss being produced to sensing point C place behind tunnel by sensing point B before tunnel, also claim fluid friction drag losses, the Pa of unit.Use Bernoulli equation to represent before tunnel after sensing point B and tunnel distinguished and admirable energy relationship between sensing point C, and set before tunnel after sensing point B and tunnel sensing point C cross section in same level coordinate starting point, therefore the effect of ignore bit's pressure energy, (1) formula can be expressed as:

P ₁+P _v1＝P ₂+P _v2+P _z（2）

Formula (2) is engineering fluid mechanics bernoulli's equation, in formula: P ₁, P ₂represent respectively the absolute static pressure on sensing point C cross section behind sensing point B before tunnel, tunnel, the Pa of unit, P _v1, P _v2represent respectively the dynamic pressure on sensing point C cross section behind sensing point B before tunnel, tunnel, the Pa of unit, because the distance between sensing point C cross section behind sensing point B and tunnel before tunnel is very near, therefore ignores fricting resistance loss P _zimpact, formula (2) is reduced to:

P ₁+P _v1＝P ₂+P _v2 （3）

If Q ₁and Q ₂represent respectively the air quantity in sensing point C cross section behind sensing point B before tunnel, tunnel, S ₁, S ₂represent respectively sensing point C sectional area behind sensing point B before tunnel, tunnel, the m of unit ²; V ₁, V ₂represent respectively the average distinguished and admirable flow velocity in sensing point C cross section behind sensing point B before tunnel, tunnel, obtained by fluid flow continuity equation:

Q ₁＝Q ₂

S ₁V ₁＝S ₂V ₂

$P_{v1}=\frac{{V_1}^2\mathrm{\ρ}}{2}---\left(4\right)$

$P_{v2}=\frac{{V_2}^2\mathrm{\ρ}}{2}$

Arrangement formula (3), (4), and establish P1-P2=△ P:

${V_1}^2=\frac{2\mathrm{\ΔP}{S}_2^2}{\mathrm{\ρ}({S_1}^2-S_2^2)}$

$V_1=\sqrt{\frac{2\mathrm{\ΔP}{S}_2^2}{\mathrm{\ρ}(S_1^2-S_2^2)}}$

$Q=S_1\·V_1=\sqrt{\frac{2\mathrm{\ΔP}{S}_1^2{S}_2^2}{\mathrm{\ρ}(S_1^2-S_2^1)}}=k\sqrt{\mathrm{\ΔP}}---\left(5\right)$

In formula (5), V ₁the mean wind speed at sensing point B place before expression tunnel, the ms of unit; Q represents the air quantity of mine main ventilator, the m of unit ³s; ρ represents atmospheric density, unit K g/m ³; Absolute differential static pressure between sensing point C behind sensing point B and tunnel before Δ P=P1-P2 wind cave tunnel, the Pa of unit; K is permanent coefficient, wherein sectional area S ₁, S ₂and atmospheric density ρ all can be considered known or records.

Formula (5) has disclosed the mathematical formulae of monitoring air quantity in wind cave, in formula (5), k is constant, therefore can use function expression Q=f (Δ P) to represent the linear magnitude relationship of Q and Δ P, therefore applying formula (5) can be by sensing point B before tunnel in monitoring ventilation fan wind cave, the static pressure of two sections of sensing point C behind tunnel and realize the monitoring of ventilation fan air quantity, because static pressure is a parameter of relatively easily measuring, making two or two groups of static pressure by mechanical technology draws and connects hole by sensing point B before tunnel in wind cave, pressure behind tunnel on sensing point C cross section draws in the Ventilator Room of receiving outside wind cave, so that long term monitoring is used.

Certainly; below be only preferred embodiment of the present utility model; the utility model is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this manual; that makes is allly equal to alternative or obvious variant, within all dropping on the essential scope of this manual, ought to be subject to protection of the present utility model.

Claims (5)

1. a wind cave air quantity real time measure display unit installing structure, comprise returnairshaft, wind cave and air volume test instrument, move towards direction along wind cave internal gas flow, one section of tunnel section area of wind cave is tendencies toward shrinkage gradually, rear end in this section of tunnel is connected with mine main ventilator, it is characterized in that, in described air volume test instrument, be provided with two blast signal pipings, wherein one end of a blast signal piping is connected in air volume test instrument, the other end stretches into inside, described tunnel and is arranged on sensing point place before tunnel, one end of another blast signal piping is connected in air volume test instrument, the other end stretches into inside, described tunnel and is arranged on sensing point place behind tunnel, article two, all to move towards direction vertical with wind cave internal gas flow for the body portion opening direction that blast signal piping stretches into inside, described tunnel.

2. a kind of wind cave air quantity real time measure display unit installing structure according to claim 1, is characterized in that, before described tunnel, behind sensing point and tunnel, the distance between sensing point is 3～5m, and the distance behind tunnel between sensing point and mine main ventilator is 2～3m.

3. a kind of wind cave air quantity real time measure display unit installing structure according to claim 1, it is characterized in that, described blast signal piping comprises an emulsion tube, two ends at emulsion tube connect respectively a copper pipe joint, one of them copper pipe joint is plugged in air volume test instrument, and another copper pipe joint stretches into inside, described tunnel.

4. a kind of wind cave air quantity real time measure display unit installing structure according to claim 3, is characterized in that, the external diameter of described copper pipe joint is 6～8mm, and the internal diameter of copper pipe joint is 1～3mm.

5. a kind of wind cave air quantity real time measure display unit installing structure according to claim 1, is characterized in that the rounded shape in cross section, described tunnel or square shape.