CN221238444U - Gas flow measuring device capable of automatically removing ash - Google Patents

Abstract

The application provides a gas flow measuring device capable of automatically removing ash, which comprises a gas conveying pipe, a first pressure guiding pipe, a second pressure guiding pipe, a first connecting pipe, a second connecting pipe, a differential pressure transmitter, a positive pressure pipe, a negative pressure pipe and a vibrating rod; the upper end of the first pressure guiding pipe is communicated with a first air inlet of the differential pressure transmitter, and the upper end of the second pressure guiding pipe is communicated with a second air inlet of the differential pressure transmitter; the lower ends of the first pressure guiding pipe and the second pressure guiding pipe vertically penetrate through the side wall of the gas conveying pipe; the second connecting pipe is communicated between the side wall of the lower end of the second pressure guiding pipe and the outer side wall of the negative pressure pipe; the two ends of the positive pressure pipe are inclined planes and have the same length as the negative pressure pipe; the upper ends of the inner side walls of the positive pressure pipe and the negative pressure pipe are provided with circular rings, and one end of the vibrating rod is provided with a hook which is hooked on the circular rings through the hook; the vibrating rod is rod-shaped at the inner part of the positive pressure pipe and the negative pressure pipe, and the part exposed outside the positive pressure pipe and the negative pressure pipe is spiral. The application not only reduces the possibility of blocking the positive pressure pipe and the negative pressure pipe, but also improves the accuracy of the gas flow measurement result.

Description

Gas flow measuring device capable of automatically removing ash

Technical Field

The application relates to the technical field of gas flow measurement, in particular to a gas flow measurement device capable of automatically removing ash.

Background

At present, a plurality of air volume measuring devices in boiler operation air pipes of domestic coal-fired power plants adopt a positive pressure pipe and a negative pressure pipe to drain air to a differential pressure transmitter, and the differential pressure transmitter is used for measuring the pressure difference of the air conveyed by the positive pressure pipe and the negative pressure pipe, so that the air flow in an air conveying pipeline can be calculated according to the pressure difference. However, when the gas contains dust and other impurities, the orifices of the positive pressure pipe and the negative pressure pipe are easy to be blocked, so that the gas flow measurement is inaccurate, the accuracy of gas automatic adjustment is further affected, and the coal consumption of a unit is more serious.

The patent number CN107664523A discloses a matrix type full smoke flow measuring device and method, the matrix type full smoke flow measuring device comprises a full pressure measuring system, a static pressure measuring system, a differential pressure measuring element and a fixing piece, wherein the full pressure measuring system consists of a plurality of measuring units, each measuring unit comprises a pressure guiding trunk and a pressure guiding pipe, the static pressure measuring system is arranged on the back side of the full pressure measuring system in parallel, the structure of the static pressure measuring system is the same as that of the full pressure measuring system, and the pipe orifice of the pressure guiding pipe faces away from the incoming smoke flow direction. Dividing the flue into a plurality of rectangular areas with the same area, wherein each rectangular area is provided with a measuring unit, so that pressure leading points are arranged in each rectangular area, and the full pressure and the static pressure can be measured; the flue is internally provided with a plurality of measuring units with the same area, the total pressure and the static pressure acquired by the measuring units are input into a differential pressure measuring element, the average value is calculated, the average total pressure and the average static pressure of the cross section of the flue are obtained, and the average measuring differential pressure of the total flue gas can be obtained through calculation. The flow velocity condition of the whole section can be calculated more accurately according to the average differential pressure, and the flue flow data can be obtained according to the area of the section of the flue according to the velocity area method.

From the above, some automatic ash removal gas flow measurement devices are available to achieve gas flow measurement, but the following problems still remain: for example, when the gas contains impurities such as dust, the pressure guiding pipe is blocked, so that the flow data measured by the measuring element is inaccurate.

Disclosure of utility model

The application provides a gas flow measuring device capable of automatically removing ash, which is used for solving the problems in the prior art.

The application provides a gas flow measuring device capable of automatically cleaning ash, which comprises: the device comprises a gas conveying pipe, a first pressure guiding pipe, a second pressure guiding pipe, a first connecting pipe, a second connecting pipe, a differential pressure transmitter, a positive pressure pipe, a negative pressure pipe and a vibrating rod;

The first pressure guiding pipe and the second pressure guiding pipe are identical in length and are arranged in a fitting mode along the length extending direction, and the upper end of the first pressure guiding pipe is communicated with a first air inlet of the differential pressure transmitter; the upper end of the second pressure guiding pipe is communicated with a second air inlet of the differential pressure transmitter; the lower ends of the first pressure guiding pipe and the second pressure guiding pipe vertically penetrate through the outer side wall of the gas conveying pipe and are reserved in the gas conveying pipe;

The first connecting pipe is communicated between the side wall of the lower end of the first pressure guiding pipe and the outer side wall of the positive pressure pipe; the second connecting pipe is communicated between the side wall of the lower end of the second pressure guiding pipe and the outer side wall of the negative pressure pipe; the first connecting pipe and the second connecting pipe are identical in length and are arranged in a fitting mode along the length direction; the two ends of the positive pressure pipe are arranged in an inclined plane shape, the lengths of the positive pressure pipe and the negative pressure pipe are the same, and the positive pressure pipe and the negative pressure pipe are attached to each other along the length direction;

The upper ends of the inner side walls of the positive pressure pipe and the negative pressure pipe are provided with circular rings, one end of the vibrating rod is provided with a hook, and the vibrating rod is hung on the circular rings through the hook; the length of the vibrating rod is greater than that of the positive pressure pipe and the negative pressure pipe, the parts of the vibrating rod, which are positioned inside the positive pressure pipe and the negative pressure pipe, are rod-shaped, and the parts, which are exposed outside the positive pressure pipe and the negative pressure pipe, are spiral.

Optionally, the positive pressure pipe, the negative pressure pipe, the first connecting pipe and the second connecting pipe are marked as a group of drainage pipes, and a plurality of groups of drainage pipes are arranged on the first pressure guiding pipe and the second pressure guiding pipe.

Optionally, the gas flow measuring device capable of automatically removing ash further comprises a connecting seat, the connecting seat is in fit connection with the outer side wall of the gas conveying pipe through the lower surface of the connecting seat, a through hole matched with the first pressure guiding pipe and the second pressure guiding pipe is formed in the connecting seat, and the first pressure guiding pipe and the second pressure guiding pipe penetrate through the connecting seat and then penetrate through the gas conveying pipe.

Optionally, for the positive pressure pipe, the ring is disposed at a position where the inclined plane is horizontally projected on an inner wall of the positive pressure pipe.

Optionally, the gas flow measuring device capable of automatically removing ash further comprises a first instrument tube, a second instrument tube and a distributed control system DCS, wherein the first instrument tube is connected between the first pressure guiding tube and the first air inlet of the differential pressure transmitter, the first air inlet corresponds to the first blocking diaphragm of the differential pressure transmitter, the second instrument tube is connected between the second pressure guiding tube and the second air inlet of the differential pressure transmitter, the second air inlet corresponds to the second blocking diaphragm of the differential pressure transmitter, and the differential pressure transmitter is in signal connection with the DCS.

Optionally, the gas flow measuring device capable of automatically removing ash further comprises an air compressor, a first electromagnetic valve is arranged on the first instrument tube, a second electromagnetic valve is arranged on the second instrument tube, and an air outlet of the air compressor is matched with air inlets of the first electromagnetic valve and the second electromagnetic valve.

The application provides a gas flow measuring device capable of automatically removing ash, which comprises a gas conveying pipe, a first pressure guiding pipe, a second pressure guiding pipe, a first connecting pipe, a second connecting pipe, a differential pressure transmitter, a positive pressure pipe, a negative pressure pipe and a vibrating rod. The upper ends of the inner side walls of the positive pressure pipe and the negative pressure pipe are provided with circular rings, one end of the vibrating rod is provided with a hook, and the vibrating rod is hung on the circular rings through the hook; the length of the vibrating rod is greater than that of the positive pressure pipe and the negative pressure pipe, the vibrating rod is rod-shaped at the inner parts of the positive pressure pipe and the negative pressure pipe, and the part exposed outside the positive pressure pipe and the negative pressure pipe is spiral. The flow rate and the flow rate of the gas in the gas conveying pipeline are continuously changed, so that the flow rate and the flow rate of the gas are changed each time, the vibrating rod vibrates, the inner walls of the positive pressure pipe and the negative pressure pipe vibrate, and the purpose of reducing and cleaning the accumulated ash in the positive pressure pipe and the negative pressure pipe is achieved. In the process of acquiring the gas flow in the gas conveying pipe in the prior art, the contact area of the vibrating rod and the gas is insufficient, the vibrating rod is insensitive to the change of the gas flow, so that the problem of incomplete dust accumulation in cleaning the positive pressure pipe and the negative pressure pipe is caused. In addition, the gas flow measurement system provided by the application has a simple structure, the used elements are common, the system is simple to maintain even if faults occur, and a user can maintain the system by himself, so that the maintenance cost is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a logic structure of an automatic ash removal gas flow measuring device according to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of an automatic ash removal gas flow measurement device according to another embodiment of the present application, wherein the lower half of fig. 2 is a schematic structural diagram in front view;

FIG. 3 is a schematic view of a connection structure among a positive pressure pipe, a first connection pipe and a first pressure guiding pipe according to another embodiment of the present application;

Fig. 4 is a schematic diagram of a connection structure among a negative pressure pipe, a second connection pipe and a second pressure guiding pipe according to another embodiment of the present application;

FIG. 5 is a schematic left-hand view of an automatic ash removal gas flow measuring device according to another embodiment of the application;

Fig. 6 is a schematic logic structure diagram of an automatic ash removal gas flow measurement device according to an embodiment of the application.

In the figure: a gas delivery pipe 1; a first pressure guiding pipe 2; a second pressure guiding pipe 3; a first connecting pipe 4; a second connection pipe 5; a differential pressure transmitter 6; a positive pressure pipe 7; a negative pressure pipe 8; a rapping bar 9; a first instrumentation tube 10; a second instrumentation tube 11; DCS12; a first solenoid valve 13; a second solenoid valve 14; an air compressor 15; a circular ring 16; and a connecting seat 17.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are also within the scope of the application. In addition, the embodiments of the present application and the features of the embodiments may be combined with each other without collision. The application will be described in detail below with reference to the drawings in connection with embodiments.

Fig. 1 is a schematic diagram of an overall structure of a gas flow measuring device capable of automatically cleaning ash according to an embodiment of the application. As shown in fig. 1, in combination with fig. 2-5, the apparatus comprises: the device comprises a gas conveying pipe 1, a first pressure guiding pipe 2, a second pressure guiding pipe 3, a first connecting pipe 4, a second connecting pipe 5, a differential pressure transmitter 6, a positive pressure pipe 7, a negative pressure pipe 8 and a vibrating rod 9;

The first pressure guiding pipe 2 and the second pressure guiding pipe 3 are identical in length and are arranged in a fitting mode along the length extending direction, and the upper end of the first pressure guiding pipe 2 is communicated with a first air inlet of the differential pressure transmitter 6; the upper end of the second pressure guiding pipe 3 is communicated with a second air inlet of the differential pressure transmitter 6; the lower ends of the first pressure guiding pipe 2 and the second pressure guiding pipe 3 vertically penetrate through the outer side wall of the gas conveying pipe 1 and are placed in the gas conveying pipe 1;

The first connecting pipe 4 is communicated between the side wall of the lower end of the first pressure guiding pipe 2 and the outer side wall of the positive pressure pipe 7; the second connecting pipe 5 is communicated between the side wall of the lower end of the second pressure guiding pipe 3 and the outer side wall of the negative pressure pipe 8; the first connecting pipe 4 and the second connecting pipe 5 have the same length and are arranged in a fitting manner along the length direction; the two ends of the positive pressure pipe 7 are inclined, the lengths of the positive pressure pipe 7 and the negative pressure pipe 8 are the same, and the positive pressure pipe and the negative pressure pipe are attached along the length direction;

The upper ends of the inner side walls of the positive pressure pipe 7 and the negative pressure pipe 8 are provided with circular rings 16, one end of the vibrating rod 9 is provided with a hook, and the vibrating rod 9 is hung on the circular rings 16 through the hook; the length of the vibrating rod 9 is greater than that of the positive pressure pipe 7 and the negative pressure pipe 8, the parts of the vibrating rod 9 positioned inside the positive pressure pipe 7 and the negative pressure pipe 8 are rod-shaped, and the parts exposed outside the positive pressure pipe 7 and the negative pressure pipe 8 are spiral.

Wherein, the inclined planes at both ends of the positive pressure pipe 7 face the direction of gas flow, and both ends of the negative pressure pipe 8 are plane surfaces. Further, the top and bottom of the positive pressure pipe 7 and the top and bottom of the negative pressure pipe 8 are spaced apart from the inner wall of the gas delivery pipe 1, so as to reduce the influence on the gas flow, and enable the gas to smoothly flow in the gas delivery pipe 1.

Further, the positive pressure pipe 7 and the negative pressure pipe 8 may be sequentially arranged along the gas flow direction, and at this time, the inclined plane of the positive pressure pipe 7 faces the gas, that is, is a windward side, and the gas reaches the positive pressure pipe 7 and then reaches the negative pressure pipe 8, so that the position of the negative pressure pipe 8 may be referred to as a leeward side.

When the gas in the gas delivery pipe 1 flows, the windward surface of the positive pressure pipe 7 is impacted by the gas flow, and the gas enters the first connecting pipe 4 and the first pressure guiding pipe 2 in sequence after entering from the positive pressure pipe 7, so that the pressure in the positive pressure pipe 7 is higher, and the pressure is called full pressure; the leeward side is not impacted by the air flow, so the pressure value in the negative pressure pipe 8 is the pressure in the gas delivery pipe 1, and the pressure is smaller, and the pressure is called static pressure. Further, the difference between the total pressure and the static pressure is a differential pressure.

In addition, positive pressure pipe 7 and negative pressure pipe 8 laminating are in the same place together to ensure that positive pressure pipe 7 and negative pressure pipe 8 acquire the gas of coplanar, thereby improve the accuracy of differential pressure measurement.

Wherein, the first pressure guiding pipe 2 is used for guiding the gas which sequentially passes through the positive pressure pipe 7 and the first connecting pipe 4 to the first air inlet of the differential pressure transmitter 6, the second pressure guiding pipe 3 is used for conveying the gas which sequentially passes through the negative pressure pipe 8 and the second connecting pipe 5 to the second air inlet of the differential pressure transmitter 6, so that the differential pressure transmitter 6 obtains the pressure which is born by the gas conveyed from the positive pressure pipe 7 and the negative pressure pipe 8, and calculates the differential pressure.

The rapping rod 9 is used for cleaning dust accumulated in the positive pressure pipe 7 and the negative pressure pipe 8, gas entering the positive pressure pipe 7 and the negative pressure pipe 8 is provided with dust, and the gas is easily accumulated at the pipe orifices of the positive pressure pipe 7 and the negative pressure pipe 8, so that the flow rate of the gas entering the positive pressure pipe 7 and the negative pressure pipe 8 is influenced, and the measurement result is further influenced.

Further, the flow rate of the gas in the gas conveying pipe 1 is changed, vibration of the vibrating rod 9 is caused, the vibrating rod 9 vibrates to impact the inner walls of the positive pressure pipe 7 and the negative pressure pipe 8, the positive pressure pipe 7 and the negative pressure pipe 8 vibrate simultaneously, and ash on the inner walls of the positive pressure pipe 7 and the negative pressure pipe 8 is removed through vibration of the pipe walls.

Further, the rapping bar 9 is arranged in a spiral shape outside the positive pressure tube 7 and the negative pressure tube 8 for increasing the contact area of the rapping bar 9 with the gas, so that when the flow rate of the gas changes, the rapping bar 9 can rapidly react to the flow rate of the gas, thereby increasing the swinging effect of the rapping bar 9.

Wherein the same length of the positive pressure pipe 7 and the negative pressure pipe 8 can be understood as: the top point of the inclined plane at the top end of the positive pressure pipe 7 is the same as the height of the plane at the top end of the negative pressure pipe 8, and the lowest point of the inclined plane at the bottom of the positive pressure pipe 7 is the same as the height of the plane at the bottom end of the negative pressure pipe 8.

The gas delivery pipe 1 is used for delivering the gas to be measured, and the gas delivery pipe 1 is generally horizontally arranged.

In fig. 2, the positive pressure pipe 7 is seen from the front, and the negative pressure pipe 8 is seen from the rear, so that in fig. 2, the negative pressure pipe 8, the second connection pipe 5, and the second pressure introduction pipe 3 are blocked by the positive pressure pipe 7, the first connection pipe 4, and the first pressure introduction pipe 2, respectively.

The working process of the gas flow measuring device capable of automatically removing ash is as follows:

1. filling gas into the gas conveying pipe 1;

2. For the positive pressure pipe 7, gas enters the positive pressure pipe 7 from the upper end and the lower end of the positive pressure pipe 7 respectively, then enters the first connecting pipe 4, passes through the first connecting pipe 4, then enters the first pressure guiding pipe 2, and is conveyed to a first air inlet of the differential pressure transmitter 6 by the first pressure guiding pipe 2; meanwhile, for the negative pressure pipe 8, gas enters the negative pressure pipe 8 from the upper end and the lower end of the negative pressure pipe 8 respectively, then enters the second connecting pipe 5, passes through the second connecting pipe 5, then enters the second pressure guiding pipe 3, and is conveyed to a second air inlet of the differential pressure transmitter 6 by the second pressure guiding pipe 3;

The differential pressure transmitter 6 receives the gas conveyed from the first pressure guiding pipe 2 and the second pressure guiding pipe 3, and respectively measures the pressure generated by the two gas to the differential pressure transmitter 6, so as to obtain a pressure difference, and further, the flow of the gas can be calculated according to the pressure difference;

3. in the above process, the gas flow rate in the gas delivery pipe 1 is generally not constant, but is changed continuously, or the gas flow rate is considered to be the impact on the rapping rod 9 is different every time the flow rate is changed, so that the rapping rod 9 is subjected to different forces, the rapping rod 9 is vibrated once, the vibration of the rapping rod 9 causes the positive pressure pipe 7 and the negative pressure pipe 8 to vibrate, and after the positive pressure pipe 7 and the negative pressure pipe 8 vibrate, ash falling on the inner walls of the positive pressure pipe 7 and the negative pressure pipe 8 is vibrated, and ash on the pipe walls is removed.

Wherein, the part of the vibrating rod 9 in the positive pressure pipe 7 and the negative pressure pipe 8 is thinner than the positive pressure pipe 7 and the negative pressure pipe 8, and is arranged along the axial direction of the positive pressure pipe 7 and the negative pressure pipe 8, is consistent with the gas flowing direction, and basically does not influence the gas flow rate.

Further, the diameter of the gas delivery tube 1 is relatively large and the rapping bar 9 is relatively small, so that the rapping bar 9 has a negligible effect on the gas flow rate within the gas delivery tube 1. In addition, the parts of the rapping rod 9 exposed to the outside of the positive pressure tube 7 and the negative pressure tube 8, that is, the parts of the rapping rod 9 located in the gas delivery tube 1, are not a plate-like object which is easy to obstruct the flow of gas, but a spiral structure which is obtained by bending a thin rod, and the gas can still flow through the inside of the spiral structure, so that the flowing speed of the gas is basically not influenced.

Here, the vibration of the rapping bar 9 causes a slight vibration of the positive pressure pipe 7 and the negative pressure pipe 8, but the slight vibration is enough to drop ash from the inner walls of the positive pressure pipe 7 and the negative pressure pipe 8.

The application provides a gas flow measuring device capable of automatically removing ash, which comprises a gas conveying pipe 1, a first pressure guiding pipe 2, a second pressure guiding pipe 3, a first connecting pipe 4, a second connecting pipe 5, a differential pressure transmitter 6, a positive pressure pipe 7, a negative pressure pipe 8 and a vibrating rod 9. The upper ends of the inner side walls of the positive pressure pipe 7 and the negative pressure pipe 8 are provided with circular rings 16, one end of the vibrating rod 9 is provided with a hook, and the vibrating rod 9 is hung on the circular rings 16 through the hook; the length of the vibrating rod 9 is larger than that of the positive pressure pipe 7 and the negative pressure pipe 8, the vibrating rod 9 is in a rod shape at the inner part of the positive pressure pipe 7 and the negative pressure pipe 8, and the part exposed outside the positive pressure pipe 7 and the negative pressure pipe 8 is in a spiral shape. The flow rate and the flow rate of the gas in the gas conveying pipe 1 are continuously changed, so that the flow rate and the flow rate of the gas are changed each time, the vibrating rod 9 vibrates, the inner walls of the positive pressure pipe 7 and the negative pressure pipe 8 vibrate, and the purpose of reducing and cleaning the dust deposit in the positive pressure pipe 7 and the negative pressure pipe 8 is achieved. According to the application, the vibrating rod 9 with the spiral bottom is added, so that the contact area with the gas in the gas conveying pipe 1 is increased, the vibrating rod 9 is more sensitive to the change of the gas flow, the aim of solving the problem that the dust deposit in the positive pressure pipe 7 and the negative pressure pipe 8 cannot be cleaned is fulfilled, the cleaning degree of the dust deposit in the positive pressure pipe 7 and the negative pressure pipe 8 is improved, the possibility of blocking the positive pressure pipe 7 and the negative pressure pipe 8 is reduced, and the accuracy of the gas flow measurement result is improved, so that the stability of a system is improved. In addition, the gas flow measurement system provided by the application has a simple structure, the used elements are common, the system is simple to maintain even if faults occur, and a user can maintain the system by himself, so that the maintenance cost is reduced.

Wherein the lateral arrangement can be understood as: the horizontal direction in which the first connecting pipe 4, the second connecting pipe 5, the first pressure guiding pipe 2 and the second pressure guiding pipe 3 are installed is perpendicular to the horizontal direction of the gas conveying pipe 1.

Optionally, the positive pressure pipe 7, the negative pressure pipe 8, the first connecting pipe 4 and the second connecting pipe 5 are marked as a group of drainage pipes, and a plurality of groups of drainage pipes are arranged on the first pressure guiding pipe 2 and the second pressure guiding pipe 3.

The above scheme can also be understood as: the first pressure guiding pipe 2 is communicated with a plurality of first connecting pipes 4, and each first connecting pipe 4 is communicated with one positive pressure pipe 7; the second pressure guiding pipes 3 are communicated with a plurality of second connecting pipes 5, and each second connecting pipe 5 is communicated with one negative pressure pipe 8.

Wherein, set up a plurality of malleation pipes 7 and negative pressure pipe 8 can be with the gaseous drainage of a plurality of positions in the gas delivery pipe 1 to differential pressure transmitter 6 to obtain a plurality of pressure differences, further improve the detection effect.

Optionally, referring to fig. 6, the automatic ash removal gas flow measuring device further includes a connecting seat 17, the connecting seat 17 is attached to the outer side wall of the gas delivery pipe 1 through the lower surface of the connecting seat 17, through holes matched with the first pressure guiding pipe 2 and the second pressure guiding pipe 3 are formed in the connecting seat 17, and the first pressure guiding pipe 2 and the second pressure guiding pipe 3 penetrate through the connecting seat 17 before penetrating through the gas delivery pipe 1.

Wherein the stability of the first pressure guiding tube 2 and the second pressure guiding tube 3 can be improved through the connecting seat 17. The distance between the first pressure guiding pipe 2 and the second pressure guiding pipe 3 can be controlled according to the distance between the two through holes on the connecting seat 17, so that the distance between the positive pressure pipe 7 and the negative pressure pipe 8 can be controlled. In particular, the positive pressure pipe 7 and the negative pressure pipe 8 are generally arranged to fit together.

The connection base 17 is attached to the outer side wall of the gas delivery pipe 1 by its lower surface, which can be understood as: the bottom surface of the connecting seat 17 is on the same plane with the tangent line of the top of the outer side of the gas delivery pipe 1.

Further, the portion of the lower surface of the connection seat 17 attached to the outer side wall of the gas delivery pipe 1 needs to be sealed to prevent the gas in the gas delivery pipe 1 from leaking through the gap of the attaching piece, thereby improving the accuracy of the detection result.

Alternatively, referring to fig. 3, for the positive pressure pipe 7, the circular ring 16 is provided at a position where the inclined surface is horizontally projected on the inner wall of the positive pressure pipe 7.

Wherein, the inclined plane horizontal projection is the highest position of malleation pipe 7 in the position of malleation pipe 7's inner wall, and rapping rod 9 passes through ring 16 to be fixed in the highest position of malleation pipe, and the other end is in malleation pipe 7 lower extreme and set up in the outside of malleation pipe 7 lower extreme to make the heliciform of rapping rod 9 lower extreme fully contact with gas, thereby make rapping rod 9 effectually clean up the deposition in the malleation pipe 7.

Further, the ring 16 is arranged at the position where the inclined plane is horizontally projected on the inner wall of the positive pressure pipe 7, so that the rapping rod 9 can be ensured to be arranged at the highest position of the positive pressure pipe 7, the rapping efficiency of the rapping rod 9 is improved, the sensitivity and accuracy of the rapping rod 9 can be improved, and when the variation degree of the air quantity is not large, the rapping rod 9 can also clean dust in the positive pressure pipe 7, and the dust accumulation in the positive pressure pipe 7 is prevented.

Optionally, referring to fig. 6, the gas flow measuring device capable of automatically removing ash further includes a first instrumentation tube 10, a second instrumentation tube 11, and a distributed control system DCS (english: distributed Control System; english: DCS) 12, where the first instrumentation tube 10 is connected between the first pressure guiding tube 2 and the first air inlet of the differential pressure transmitter 6, the first air inlet corresponds to a first blocking diaphragm of the differential pressure transmitter 6, the second instrumentation tube 11 is connected between the second pressure guiding tube 3 and a second air inlet of the differential pressure transmitter 6, the second air inlet corresponds to a second blocking diaphragm of the differential pressure transmitter 6, and the differential pressure transmitter 6 is in signal connection with the DCS 12.

Wherein, first pressure guiding pipe 2 and first air inlet are communicated through first instrument pipe 10, and second pressure guiding pipe 3 and second air inlet are communicated through second instrument pipe 11.

The blocking diaphragm is used for conducting pressure to the measuring element, the measuring element converts a measured differential pressure signal into an electric signal corresponding to the differential pressure signal, the electric signal is transmitted to the converter, and the electric signal is converted into a standard electric signal and is output to the DCS12.

Wherein, first instrument pipe 10 and second instrument pipe 11 are used for guiding the gas in first induced pressure pipe 2 and second induced pressure pipe 3 to differential pressure transmitter 6.

Further, the gas in the first pressure guiding pipe 2 and the second pressure guiding pipe 3 is initially the gas in the gas conveying pipe 1, the gas firstly enters the positive pressure pipe 7 and the negative pressure pipe 8, then is transmitted to the first pressure guiding pipe 2 and the second pressure guiding pipe 3 through the first connecting pipe 4 and the second connecting pipe 5, and then is conveyed to the differential pressure transmitter 6 through the first meter pipe 10 and the second meter pipe 11, so that the differential pressure transmitter 6 obtains the pressure of the positive pressure pipe 7 and the negative pressure pipe 8, and calculates the differential pressure.

Further, the differential pressure is related to the flow rate of the gas, and the larger the flow rate of the gas in the gas delivery pipe 1 is, the larger the differential pressure is, and conversely, the smaller the flow rate of the gas is, the smaller the differential pressure is.

Optionally, referring to fig. 6, the gas flow measuring device capable of automatically removing ash further includes an air compressor 15, a first electromagnetic valve 13 is disposed on the first instrument tube 10, a second electromagnetic valve 14 is disposed on the second instrument tube 11, and an air outlet of the air compressor 15 is matched with air inlets of the first electromagnetic valve 13 and the second electromagnetic valve 14.

Wherein an air compressor 15 is used to inject gas into the first instrumentation tube 10 and the second instrumentation tube 11. For the gas that gets into in the first instrument pipe 10, again pass through first draw pressure pipe 2, first connecting pipe 4 and malleation pipe 7 in proper order, because the impact force of the gas that air compressor 15 produced is great, when gas passed through above-mentioned each pipeline, can produce the impact to the ash on pipeline and the pipeline to the ash on the pipeline is knocked down, plays the effect of clearance ash. Similarly, the gas entering the second instrumentation tube 11 can also knock down ash on the pipeline through which the gas passes, thereby playing a role in cleaning ash.

Further, the first solenoid valve 13 and the second solenoid valve 14 control the time for injecting the air compressor 15 into the pipeline, and when the air needs to be injected into the pipeline, the DCS12 controls the first solenoid valve 13 and the second solenoid valve 14 to be opened, and the air compressor 15 injects the air inwards.

The on/off of the first solenoid valve 13 and the second solenoid valve 14 may be controlled by the DCS12 or may be controlled manually.

Wherein the air compressor 15 sprays gas inwards, and the rapping bar 9 vibrates simultaneously due to the flow of the gas, and dust and dirt in the pipe wall are removed by the vibration of the rapping bar 9 and the gas sprayed by the air compressor 15.

Further, the staff can choose to use the first electromagnetic valve 13 or the second electromagnetic valve 14 according to the blocking condition in the pipeline, and the different areas in the pipeline can be cleaned by controlling the first electromagnetic valve and the second electromagnetic valve respectively, so that thorough cleaning in the pipeline can be ensured, and the measuring accuracy is improved.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.

Finally, it should be noted that what is not described in the technical solution of the present application can be implemented using the prior art. In addition, the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (6)

1. The gas flow measuring device capable of automatically removing ash is characterized by comprising a gas conveying pipe, a first pressure guiding pipe, a second pressure guiding pipe, a first connecting pipe, a second connecting pipe, a differential pressure transmitter, a positive pressure pipe, a negative pressure pipe and a vibrating rod;

The first pressure guiding pipe and the second pressure guiding pipe are identical in length and are arranged in a fitting mode along the length extending direction, and the upper end of the first pressure guiding pipe is communicated with a first air inlet of the differential pressure transmitter; the upper end of the second pressure guiding pipe is communicated with a second air inlet of the differential pressure transmitter; the lower ends of the first pressure guiding pipe and the second pressure guiding pipe vertically penetrate through the outer side wall of the gas conveying pipe and are reserved in the gas conveying pipe;

The first connecting pipe is communicated between the side wall of the lower end of the first pressure guiding pipe and the outer side wall of the positive pressure pipe; the second connecting pipe is communicated between the side wall of the lower end of the second pressure guiding pipe and the outer side wall of the negative pressure pipe; the first connecting pipe and the second connecting pipe are identical in length and are arranged in a fitting mode along the length direction; the two ends of the positive pressure pipe are arranged in an inclined plane shape, the lengths of the positive pressure pipe and the negative pressure pipe are the same, and the positive pressure pipe and the negative pressure pipe are attached to each other along the length direction;

The upper ends of the inner side walls of the positive pressure pipe and the negative pressure pipe are provided with circular rings, one end of the vibrating rod is provided with a hook, and the vibrating rod is hung on the circular rings through the hook; the length of the vibrating rod is greater than that of the positive pressure pipe and the negative pressure pipe, the parts of the vibrating rod, which are positioned inside the positive pressure pipe and the negative pressure pipe, are rod-shaped, and the parts, which are exposed outside the positive pressure pipe and the negative pressure pipe, are spiral.

2. The automatic ash removal gas flow measuring device according to claim 1, wherein the positive pressure pipe, the negative pressure pipe, the first connecting pipe and the second connecting pipe are marked as a group of drainage pipes, and a plurality of groups of drainage pipes are arranged on the first pressure guiding pipe and the second pressure guiding pipe.

3. The automatic ash removal gas flow measuring device according to claim 2, further comprising a connecting seat, wherein the connecting seat is attached to the outer side wall of the gas conveying pipe through the lower surface of the connecting seat, a through hole matched with the first pressure guiding pipe and the second pressure guiding pipe is formed in the connecting seat, and the first pressure guiding pipe and the second pressure guiding pipe penetrate through the connecting seat before penetrating through the gas conveying pipe.

4. The automatic ash removal gas flow rate measurement device according to claim 1, wherein for the positive pressure pipe, the circular ring is provided at a position where the inclined surface is horizontally projected on an inner wall of the positive pressure pipe.

5. The automatic ash removal gas flow measurement device according to any one of claims 1-4, further comprising a first instrumentation tube, a second instrumentation tube and a distributed control system DCS, wherein the first instrumentation tube is connected between the first pressure introducing tube and a first air inlet of the differential pressure transmitter, the first air inlet corresponds to a first blocking diaphragm of the differential pressure transmitter, the second instrumentation tube is connected between the second pressure introducing tube and a second air inlet of the differential pressure transmitter, the second air inlet corresponds to a second blocking diaphragm of the differential pressure transmitter, and the differential pressure transmitter is in signal connection with the DCS.

6. The automatic ash removal gas flow measurement device according to claim 5, further comprising an air compressor, wherein a first solenoid valve is provided on the first instrumentation tube, a second solenoid valve is provided on the second instrumentation tube, and an air outlet of the air compressor is matched with air inlets of the first solenoid valve and the second solenoid valve.