Multi-point matrix flowmeter with self-ash-cleaning double-bevel-opening type pressure-equalizing measurement function

Abstract

The utility model provides a self-deashing double bevel type pressure-equalizing measurement multipoint matrix flowmeter, which comprises a primary pressure-equalizing chamber, a secondary pressure-equalizing chamber, a tertiary pressure-equalizing chamber and at least two groups of dynamic pressure output pipes and static pressure output pipes, and the adjacent dynamic pressure output pipes / static pressure output pipes are connected through the tertiary pressure-equalizing chamber. According to the utility model, a plurality of primary pressure equalizing chambers and a plurality of groups of dynamic and static pressure output pipes are designed, so that a plurality of measuring points are realized, measurement data fluctuation is reduced, and measurement stability and accuracy are ensured; furthermore, the dynamic pressure and the static pressure are fully balanced through three times of pressure equalization of the flow meter, the pressure stabilizing effect can be provided, the pressure loss can also be reduced, and therefore stable measurement of the flow meter is achieved; in addition, due to the multi-curve labyrinth design formed in the flowmeter, dust can be prevented from entering a dynamic and static pressure tapping opening, and dust accumulation is avoided at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of the boiler air and flue gas system and the air volume measurement technology of the pulverizing system of thermal power plant, in particular to a kind of self-cleaning double-bevel formula pressure-equalizing measurement multipoint matrix flowmeter. BACKGROUND

[0002] At present, there are many types of air volume measurement devices for thermal power air and flue gas systems, mainly including thermal flowmeters, Venturi flowmeters, wing-type flowmeters, orifice flowmeters, etc. With the continuous development of large-capacity and high-parameter power generators in China, there are higher requirements for the accuracy and reliability of air volume measurement in the air and flue gas system and the pulverizing system of the boiler. It is increasingly important and urgent to control and optimize the boiler combustion, reduce the coal consumption of power generation, improve the ability to "compete for power transmission" and the comprehensive utilization of fly ash, and ensure the normal operation of the boiler combustion.

[0003] However, each type of flowmeter has its own advantages and disadvantages. Each type can perform at its best in the appropriate measurement environment, but each has its own shortcomings when used in the air and flue gas system of a thermal power plant: (1) a set of air volume has only one measurement point, and only one transmitter can be matched. Nowadays, the unit capacity is gradually increasing, and the cross-sectional area of the air duct of the air and flue gas system increases accordingly. The flow field in the air duct is uneven, and the disturbance is large. The differential pressure value of a single measurement point fluctuates greatly, and it is already impossible to measure stably and normally. Moreover, a flow measurement point with protection usually needs to be matched with two or more transmitters to ensure the stability of the measurement point; (2) the air duct usually contains dust, which can easily enter the internal pipeline of the flowmeter. Long-term accumulation can easily cause dust accumulation in the sampling pipe, resulting in no differential pressure value, which can cause the air fan to trip, and even cause non-stop accidents to the running unit. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a self-cleaning double-bevel formula pressure-equalizing measurement multipoint matrix flowmeter to solve the problems of few measurement points, unstable measurement, and easy dust accumulation in the pipeline in the prior art.

[0005] To achieve the above object and other related objects, the utility model provides a kind of with self-cleaning double-bevel formula equalizing measurement multipoint matrix flowmeter, including primary equalizing chamber, secondary equalizing chamber, tertiary equalizing chamber, at least two groups of dynamic pressure output pipe and static pressure output pipe, the primary equalizing chamber is divided into dynamic pressure primary equalizing chamber and static pressure primary equalizing chamber, the dynamic pressure primary equalizing chamber and the static pressure primary equalizing chamber are connected to dynamic pressure output pipe and static pressure output pipe respectively by secondary equalizing chamber, the upper and lower ends of the dynamic pressure primary equalizing chamber and the lower end of dynamic pressure output pipe are provided with dynamic pressure measuring port, the upper and lower ends of the static pressure primary equalizing chamber and the lower end of static pressure output pipe are provided with dynamic pressure measuring port;Adjacent dynamic pressure output pipe / static pressure output pipe is connected by tertiary equalizing chamber, the upper end of the dynamic pressure output pipe forms dynamic pressure pressure port, and the upper end of the static pressure output pipe forms static pressure pressure port.

[0006] In an embodiment of the utility model, the inside of the primary equalizing chamber, the dynamic pressure output pipe and the static pressure output pipe are all installed with self-cleaning swing rod.

[0007] In an embodiment of the utility model, the dynamic pressure measuring port / static pressure measuring port is oblique cut or flat.

[0008] In an embodiment of the utility model, the dynamic pressure measuring port is oblique cut, and the included angle between the oblique cut and the longitudinal direction is 30 °.

[0009] In an embodiment of the utility model, the static pressure measuring port is flat, and the static pressure primary equalizing chamber is arranged behind the dynamic pressure primary equalizing chamber.

[0010] In an embodiment of the utility model, the secondary equalizing chamber is divided into dynamic pressure secondary equalizing chamber and static pressure secondary equalizing chamber, the dynamic pressure primary equalizing chamber is connected with the dynamic pressure output pipe through the dynamic pressure secondary equalizing chamber, and the static pressure primary equalizing chamber is connected with the static pressure output pipe through the static pressure secondary equalizing chamber.

[0011] In an embodiment of the utility model, the tertiary equalizing chamber is in trapezoidal structure, in one-dimensional structure or in cross structure. It is used for connecting at least two groups of dynamic pressure output pipe and static pressure output pipe.

[0012] In an embodiment of the utility model, the upper end of the dynamic pressure output pipe and the static pressure output pipe is stretched out to the outside of the wind box after passing through mounting flange.

[0013] In an embodiment of the utility model, the mounting flange is welded on the upper side of the wind box, and the inside of the wind box is welded and fixed with primary equalizing chamber, dynamic pressure output pipe and static pressure output pipe by fixed angle iron.

[0014] In an embodiment of the utility model, the dynamic pressure output pipe and the static pressure output pipe adopt square tube or round tube.

[0015] As described above, the utility model discloses a kind of self-cleaning double-bevel formula pressure equalizing measurement multipoint matrix flowmeter, with following

[0016] Beneficial effects:

[0017] 1, the utility model discloses a plurality of primary pressure equalizing chambers and multiple sets of dynamic and static pressure output pipes, realize multiple measuring points, reduce measurement data fluctuation, ensure the stability and accuracy of measurement;Furthermore, after the three times pressure equalizing of the flowmeter, dynamic and static pressure are fully balanced, i.e. stable pressure effect can be provided, and pressure loss can be reduced, so that the stable measurement of flowmeter is achieved;In addition, the multiple curved labyrinths formed in the flowmeter can prevent dust from entering the dynamic and static pressure tapping ports, while avoiding dust accumulation.

[0018] 2, the utility model discloses that self-cleaning swing lever is installed in primary pressure equalizing chamber and dynamic and static pressure output pipe, and self-cleaning swing lever uses pendulum principle to clean dust in pipe, ensure that flowmeter can be normally measured under different working conditions, without additional power, and long-term operation will not be blocked.

[0019] 3, the dynamic pressure measurement port of the utility model adopts inclined section design, which can increase its caliber, and the pressure measurement efficiency is high;And the primary pressure equalizing chamber of dynamic pressure adopts double-bevel design, and two sides can be used as dynamic pressure measurement port, to increase double service life.

[0020] 4, the utility model adopts equal-section multipoint matrix design, to ensure that it can be measured with high precision under short straight pipe section and flow field turbulence. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It shows the structure diagram of the self-cleaning double-bevel formula pressure equalizing measurement multipoint matrix flowmeter disclosed in the embodiment of the utility model.

[0022] Figure 2 It shows the structure diagram of the primary pressure equalizing chamber disclosed in the embodiment of the utility model.

[0023] Element number explanation

[0024] 1, dynamic pressure measurement port;2, static pressure measurement port;3, primary pressure equalizing chamber;31, dynamic primary pressure equalizing chamber;32, static primary pressure equalizing chamber;4, secondary pressure equalizing chamber;5, dynamic pressure output pipe;6, static pressure output pipe;7, tertiary pressure equalizing chamber;8, dynamic pressure tapping port;9, static pressure tapping port;10, self-cleaning swing lever;11, mounting flange;12, fixed angle iron;13, bellow. DETAILED DESCRIPTION

[0025] The following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] Please refer to Figure 1 The utility model provides a kind of self-cleaning double-bevel formula pressure measurement multipoint matrix flowmeter, including primary pressure chamber 3, secondary pressure chamber 4, tertiary pressure chamber 7, three groups of dynamic pressure output pipe 5 and static pressure output pipe 6, the primary pressure chamber 3 is divided into dynamic pressure primary pressure chamber 31 and static pressure primary pressure chamber 32, the secondary pressure chamber 4 is divided into dynamic pressure secondary pressure chamber and static pressure secondary pressure chamber, the dynamic pressure primary pressure chamber 313 is connected with the dynamic pressure output pipe 5 by dynamic pressure secondary pressure chamber, the static pressure primary pressure chamber 32 is connected with the static pressure output pipe 6 by static pressure secondary pressure chamber, the upper and lower ends of dynamic pressure primary pressure chamber 31 and the lower end of dynamic pressure output pipe 5 are equipped with dynamic pressure measuring port 1, the upper and lower ends of static pressure primary pressure chamber 32 and the lower end of static pressure output pipe 6 are equipped with dynamic pressure measuring port 1, the tertiary pressure chamber 7 is divided into dynamic pressure tertiary pressure chamber and static pressure tertiary pressure chamber, adjacent dynamic pressure output pipe 5 / static pressure output pipe 6 is connected by dynamic pressure tertiary pressure chamber / static pressure tertiary pressure chamber respectively, the upper end of dynamic pressure output pipe 5 forms dynamic pressure pressure port 8, and the upper end of static pressure output pipe 6 forms static pressure pressure port 9.

[0027] The utility model designs multiple primary pressure chambers and multiple groups of dynamic and static pressure output pipes, realizes multiple measuring points, reduces measurement data fluctuation, and ensures the stability and accuracy of measurement; furthermore, the dynamic and static pressures are fully balanced through the tertiary pressure of the flowmeter, which can provide stable pressure and reduce pressure loss, thereby achieving stable measurement of the flowmeter; in addition, the multiple curved labyrinths formed in the flowmeter can prevent dust from entering the dynamic and static pressure pressure ports and avoid dust accumulation.

[0028] Further, the primary pressure chamber 3, the dynamic pressure output pipe 5 and the static pressure output pipe 6 are each internally mounted with a self-cleaning swing rod 10. The self-cleaning swing rod adopts a pendulum principle and is internally hung with a swing rod, ensuring that the flowmeter can be normally measured under different working conditions without additional power and without clogging during long-term operation.

[0029] Further, the primary pressure chamber 3, the secondary pressure chamber 4 and the tertiary pressure chamber 7 have the same cross-sectional area and adopt an equal-section multi-point matrix design, ensuring high-precision measurement under short straight pipe sections and flow field turbulence.

[0030] Reference Figure 2The dynamic pressure measuring port 1 is a slanting cut, and the angle between the slanting cut and the longitudinal direction is 30 degrees. The static pressure measuring port 2 is a flat port, and the static pressure primary equalizing chamber 32 is arranged behind the dynamic pressure primary equalizing chamber 31. The dynamic pressure measuring port 1 adopts a slanting section design, so that the diameter of the dynamic pressure measuring port 1 can be increased, and the pressure measuring efficiency is high. The dynamic pressure primary equalizing chamber 31 adopts a double slanting port design, and two sides of the dynamic pressure primary equalizing chamber 31 can be used as the dynamic pressure measuring port 1, so that the service life is doubled.

[0031] Further, the tertiary equalizing chamber 7 is in a trapezoidal structure, a straight line structure or a cross structure, and is used for connecting three groups of dynamic pressure output pipes 5 and static pressure output pipes 6. The top ends of the three groups of dynamic pressure output pipes 5 and static pressure output pipes 6 form three pairs of independent pressure taking ports.

[0032] Further, the upper ends of the dynamic pressure output pipes 5 and the static pressure output pipes 6 extend out of the wind box 13 after passing through the mounting flange 11.

[0033] Further, the mounting flange 11 is welded on the upper side of the wind box 13, and the fixed angle iron 12 is used for welding and fixing the primary equalizing chamber 3, the dynamic pressure output pipe 5 and the static pressure output pipe 6 in the wind box 13. The fixed angle iron 12 is welded on the inner wall of the wind box 13 and the matrix flow meter, and is used for fixing the matrix flow meter.

[0034] Further, the dynamic pressure output pipe 5 and the static pressure output pipe 6 are square pipes or round pipes.

[0035] In actual measurement, the wind or flue gas enters the dynamic pressure primary equalizing chamber and the static pressure primary equalizing chamber through multiple pairs of dynamic pressure measuring ports and static pressure measuring ports, and then is subjected to secondary equalization in the dynamic pressure secondary equalizing chamber and the static pressure secondary equalizing chamber. Subsequently, the wind or flue gas enters the tertiary equalizing chamber through the dynamic pressure output pipe and the static pressure output pipe, and is subjected to tertiary equalization. The dynamic pressure, the static pressure and the let pressure are fully balanced. Finally, the three pairs of dynamic pressure taking ports and the static pressure taking ports respectively deliver the let pressure, the dynamic pressure and the static pressure to three differential pressure transmitters through the pressure lead pipes. The differential pressure transmitters convert the differential pressure signals into 4-20mA signals and deliver the 4-20mA signals to the DCS. The real-time flow is calculated by using a logical formula.

[0036] As described above, the utility model discloses multiple primary equalizing chambers and multiple groups of dynamic pressure output pipes and static pressure output pipes, multiple measuring points are realized, the measurement data fluctuation is reduced, and the stability and accuracy of measurement are ensured. Furthermore, the dynamic pressure, the static pressure and the let pressure are fully balanced through the three equalizations of the flow meter, so that the stable pressure effect can be provided, and the pressure loss can be reduced, so that the stable measurement of the flow meter is achieved. In addition, the multiple curved labyrinths formed in the flow meter can prevent the dust from entering the dynamic pressure taking port and the static pressure taking port, and the dust accumulation is avoided. Therefore, the utility model effectively overcomes the various shortcomings in the prior art and has high industrial utilization value.

[0037] Wherein, the terms such as "upper", "lower", "left", "right", "front", "back", "middle" and "one" cited in the specification are only for the convenience of clear description, and are not used to limit the scope of the utility model, and the change or adjustment of the relative relationship is also regarded as the scope of the utility model without substantial change of the technical content.

[0038] The above embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. All equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A self-scavenging dual bevel ported equalizing measurement multipoint matrix flowmeter characterized by, The primary equalizing chamber (3), the secondary equalizing chamber (4), the tertiary equalizing chamber (7), at least two groups of dynamic pressure output pipes (5) and static pressure output pipes (6), the primary equalizing chamber (3) is divided into a dynamic pressure primary equalizing chamber (31) and a static pressure primary equalizing chamber (32), the dynamic pressure primary equalizing chamber (31) and the static pressure primary equalizing chamber (32) are connected to the dynamic pressure output pipe (5) and the static pressure output pipe (6) through the secondary equalizing chamber (4) respectively, the upper and lower ends of the dynamic pressure primary equalizing chamber (31) and the lower end of the dynamic pressure output pipe (5) are provided with a dynamic pressure measuring port (1), the upper and lower ends of the static pressure primary equalizing chamber (32) and the lower end of the static pressure output pipe (6) are provided with a dynamic pressure measuring port (1); adjacent dynamic pressure output pipes (5) / static pressure output pipes (6) are connected through the tertiary equalizing chamber (7), the upper end of the dynamic pressure output pipe (5) forms a dynamic pressure pressure port (8), and the upper end of the static pressure output pipe (6) forms a static pressure pressure port (9); The dynamic pressure measuring port (1) is a slanting cut, and the static pressure measuring port (2) is a flat port, and the static pressure primary equalizing chamber (32) is arranged behind the dynamic pressure primary equalizing chamber (31); The dynamic pressure primary equalizing chamber (31), the static pressure primary equalizing chamber (32), the dynamic pressure output pipe (5) and the static pressure output pipe (6) are internally provided with a self-cleaning swing rod (10); The cross-sectional areas of the primary equalizing chamber (3), the secondary equalizing chamber (4) and the tertiary equalizing chamber (7) are the same.

2. A self-cleaning dual bevel ported equalizing pressure measurement multi-point matrix flow meter according to claim 1, wherein, The angle between the slanting cut of the dynamic pressure measuring port (1) and the longitudinal direction is 30°.

3. A self-cleaning dual bevel ported equalizing pressure measurement multi-point matrix flow meter according to claim 1, wherein, The secondary equalizing chamber (4) is divided into a dynamic pressure secondary equalizing chamber and a static pressure secondary equalizing chamber, the dynamic pressure primary equalizing chamber (31) is connected to the dynamic pressure output pipe (5) through the dynamic pressure secondary equalizing chamber, and the static pressure primary equalizing chamber (32) is connected to the static pressure output pipe (6) through the static pressure secondary equalizing chamber.

4. A self-cleaning dual bevel ported equalizing pressure measurement multi-point matrix flow meter according to claim 1, wherein, The tertiary equalizing chamber (7) is in a trapezoidal structure, a straight line structure or a cross structure, and is used for connecting at least two groups of dynamic pressure output pipes (5) and static pressure output pipes (6).

5. A self-cleaning dual bevel ported equalizing pressure measurement multi-point matrix flow meter according to claim 1, wherein, The upper ends of the dynamic pressure output pipe (5) and the static pressure output pipe (6) extend out of the wind box (13) after penetrating through the mounting flange (11).

6. A self-cleaning dual bevel ported equalizing pressure measurement multi-point matrix flow meter according to claim 5, wherein, The mounting flange (11) is welded above the wind box (13), and the fixed angle iron (12) is used to weld and fix the primary equalizing chamber (3), the dynamic pressure output pipe (5) and the static pressure output pipe (6) in the wind box (13).

7. A self-cleaning dual bevel ported equalizing pressure measurement multi-point matrix flow meter according to claim 1, wherein, The dynamic pressure output pipe (5) and the static pressure output pipe (6) are square pipes or round pipes.

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