CN203365459U - Bidirectional wind speed and wind direction monitoring system - Google Patents

Abstract

The utility model discloses a two-way wind speed and wind direction monitoring system, which comprises a micro-differential pressure sampling probe and a micro-pressure differential element; The utility model adopts two pressure pipes, which can be used for two-way measurement, flexible and convenient, and is suitable for measuring wind speed and wind direction in extremely harsh conditions such as coal mines. The structure is simple, At the same time, the pressure induction pipe has a diversion groove, which makes it difficult for the condensate to form surface tension, avoids clogging, has strong resistance to dust and water vapor, high measurement accuracy and stability, simple structure, easy processing and assembly, and a long service life. Cost of use; there is also a zero-clearing component to eliminate the hysteresis nonlinearity after the full-scale operation of the diffused silicon pressure sensor; after use, the zero point change of the utility model within the range of 0-40°C is less than 0.1Pa, and can realize stable measurement of 0.1Pa .

Description

Two-way wind speed and wind direction monitoring system

technical field

The utility model relates to a safety auxiliary equipment suitable for underground coal mines, in particular to a two-way wind speed and wind direction monitoring system.

Background technique

Mine ventilation is to continuously send the surface air to the underground, and at the same time continuously discharge the dirty air from the underground to the outside of the mine. Mine ventilation is the basis of safe production in coal mines. It not only has the important function of transporting fresh air to various underground wind sites and ensuring the breathing of underground workers, but also has the functions of diluting, removing mine gas and dust, and cooling the operating area. Reasonable ventilation is an important means to restrain the development of natural coal and fire, but if the ventilation system is not properly arranged or managed properly, it will be the main reason for the accumulation of gas and spontaneous combustion, as well as the further expansion of gas and fire accidents. Therefore, improving the ventilation technology and monitoring level of the mine is the basis for ensuring the normal production and safety of the mine, and the wind speed and wind direction sensors are the main means of monitoring the size and direction of the underground wind speed, providing strong technical support for ensuring the safety of coal mine production. Most of the wind speed sensors in the prior art adopt the principle of ultrasonic vortex street, the measurement method is relatively simple, the use of equipment is relatively restricted, not flexible enough, and it cannot realize two-way wind speed and wind direction measurement, and the long-term work is easily affected by dust and water vapor, which affects the measurement accuracy; later appeared Sensors with differential pressure measurement principles, such as shrink tube wind speed sensors, still cannot achieve accurate measurement of two-way wind speed and wind direction; and the above sensors do not have the ability to automatically clear, but the inherent unconventional and multi-value corresponding hysteresis of the pressure sensor itself Non-linear characteristics and zero temperature drift characteristics limit its measurement accuracy.

In the prior art, there has been an electronically controlled automatic zero-point calibration pressure differential sensor, such as the valve assembly disclosed in patent application 201180032464.5, which has the function of automatic zero-point calibration, but its structure is complex, processing and assembly is extremely difficult, and this product is due to various The coordination precision between kinematic pairs is high, so extremely high sealing performance is required, otherwise it will fail when used in harsh conditions such as coal mines.

Therefore, there is a need for a two-way wind speed and wind direction monitoring system, which is suitable for measuring wind speed and wind direction in extremely harsh conditions such as coal mines. It has high measurement accuracy and stability, simple structure, easy processing and assembly, and a long service life. The cost.

Utility model content

In view of this, the utility model provides a two-way wind speed and wind direction monitoring system, which is suitable for measuring wind speed and wind direction in extremely harsh conditions such as coal mines. It has high measurement accuracy and stability, simple structure, easy processing and assembly, and uses The cycle is longer and the cost of use is saved.

The two-way wind speed and wind direction monitoring system of the utility model includes a micro-differential pressure sampling probe and a micro-pressure differential element;

The micro-differential pressure sampling probe includes a pressure introduction pipe I and a pressure introduction pipe II for sampling, and the flow channels of the pressure introduction pipe I and the pressure introduction pipe II are respectively provided with diversion grooves.

Further, the pressure induction pipe I and the pressure induction pipe II are arranged symmetrically and the diversion grooves are respectively arranged along the axial direction;

Further, it also includes an automatic zero-clearing component, the micro-pressure differential element has a sampling port I and a sampling port II, and the pressure introduction pipe I and the pressure introduction pipe II are correspondingly connected with an air outlet I and an air outlet II;

The automatic zeroing component is provided with interface I, interface II and interface III, the interface I is connected to the gas outlet I, the interface II is connected to the sampling port I, and the interface III is connected to the sampling port II; the gas outlet II is connected to the sampling port II, the switchable connection between the interface I and the interface III is connected to or closed with the interface II;

Further, it also includes an automatic control system; the automatic zeroing component includes a two-position three-way solenoid valve with interface I, interface II and interface III;

The automatic control system includes:

a command input unit for inputting an external command;

The central processing unit is used to receive external commands, differential pressure signals of the micro-pressure differential element and output control commands to the control circuit of the two-position three-way solenoid valve;

The data output unit is used to receive the command signal of the central processing unit and output data information;

Further, the micro-differential pressure sampling probe also includes a sampling buffer, which includes a buffer chamber shell and a sampling buffer chamber I and a sampling buffer chamber II formed separately in the buffer chamber shell, a pressure introduction tube I, a pressure introduction tube II and an outlet. The gas port I and the gas outlet II are connected through the sampling buffer chamber I and the sampling buffer chamber II;

Further, the pressure induction pipe I and the pressure induction pipe II are symmetrically arranged, and the pipe wall is respectively provided with diversion grooves along the axial direction, and the diversion grooves are located at the inlet end of the pressure induction pipe I and the inlet end of the pressure induction pipe II. gas end opening;

Further, both the pressure induction pipe I and the pressure induction pipe II adopt a Pitot tube structure, the ends of the pressure induction pipe I and the end of the pressure induction pipe II are bent opposite to each other, and the diversion grooves are aligned radially. set on the back; the diversion groove penetrates the pipe wall along the radial direction of the pressure induction pipe;

Further, the automatic control system also includes an alarm unit for receiving control commands from the central processing unit and sending an alarm signal; the central processing unit, the micro-pressure differential element, the two-position three-way solenoid valve and its control circuit are plastic-sealed in a housing , the command input unit and the data output unit are located on the surface of the housing;

Further, the automatic zeroing assembly also includes a tee connected to the gas outlet II, the sampling port II and the interface III; the pressure introduction pipe I and the pressure introduction pipe II are fixedly connected or integrally formed on the same pressure introduction pipe flange , the flange of the pressure induction pipe is detachably and hermetically connected to the shell of the buffer chamber in the form of an end cover;

Further, the sampling buffer chamber I is directly formed by the buffer chamber casing, and the sampling buffer chamber II is formed by the inner cavity of a short joint located in the buffer chamber shell, and the short joint is sealed from the outside by a flange and pressed against the buffer chamber along its axial direction. inside the housing.

Beneficial effects of the utility model: the two-way wind speed and wind direction monitoring system of the utility model adopts two pressure guide tubes, which can be used for two-way measurement, flexible and convenient, and is suitable for measuring wind speed and wind direction in extremely harsh conditions such as coal mines. Simplicity, at the same time, the pressure induction pipe has a diversion groove, so that the condensate is not easy to form surface tension, avoid clogging, strong resistance to dust and water vapor, high measurement accuracy and stability, with zero calibration function, simple structure, easy processing and assembly , and the use cycle is longer, saving the cost of use.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the structural representation of the utility model;

Fig. 3 is the structural representation of micro-differential pressure sampling probe;

Fig. 4 is the side view of Fig. 3;

Fig. 5 is a flow chart of the detection method of the present invention.

Detailed ways

Fig. 1 is a functional block diagram of the present utility model, Fig. 2 is a schematic structural view of the present utility model, Fig. 3 is a schematic structural view of a differential pressure sampling probe, and Fig. 4 is a side view of Fig. 3; as shown in the figure: the utility model The two-way wind speed and wind direction monitoring system includes a micro-differential pressure sampling probe 1 and a micro-pressure differential element 8; the micro-pressure differential element 8 is generally made of an existing pressure sensor, and will not be repeated here;

The micro-differential pressure sampling probe 1 includes the pressure induction pipe I16 and the pressure introduction pipe II17 for sampling. Two pressure introduction pipe structures can be used to realize bidirectional sampling, and the use is simple and convenient; when sampling, the pressure introduction pipe I16 can be set as The high-pressure induction pipe, and the pressure induction pipe II17 is a low-pressure induction pipe; the flow channels of the pressure induction pipe I16 and the pressure induction pipe II17 are respectively provided with diversion grooves, which are used to eliminate the surface tension generated by the condensate and avoid blockage.

In this embodiment, the pressure induction pipe I16 and the pressure induction pipe II17 are arranged symmetrically and the guide grooves are respectively arranged along the axial direction (as shown in the figure, the guide groove 19 on the pressure introduction pipe I16 and the guide groove on the pressure introduction pipe II17 The diversion groove 18), the diversion groove (the diversion groove 19 and the diversion groove 18) is located at the inlet end of the pressure induction pipe I16 and the opening of the inlet end of the pressure induction pipe II17; the symmetrical arrangement is more conducive to two-way detection, Moreover, the diversion groove makes the pipe wall discontinuous, and the condensed water cannot form a continuous surface tension, so it will flow out with the diversion groove to avoid the occurrence of condensed water or dust clogging; the axial direction refers to the axial direction of the pressure induction pipe, and also That is, the flow direction of the airflow along the flow path of the pressure induction pipe.

In this embodiment, an automatic zero-clearing component is also included, and the micro-pressure differential element 8 has a sampling port I81 and a sampling port II82, and the pressure introduction pipe I16 and the pressure introduction pipe II17 are correspondingly connected with an air outlet I11 and an air outlet II12 , that is, the pressure introduction pipe I16 is connected to the air outlet I11, and the pressure introduction pipe II17 is connected to the air outlet II12; the automatic zeroing component is provided with an interface I61, an interface II62 and an interface III63, and the interface I61 is connected to the air outlet I11 and the interface II62 It is connected to the sampling port I81, and the interface III63 is connected to the sampling port II82; the gas outlet II12 is connected to the sampling port II82, and the interface I61 and the interface III63 can be switched to connect to or close the interface II62; according to the above structure, the interface I61 The switch between port Ⅲ63 and port Ⅲ63 can be realized by solenoid valve, other electric drive structure can also be adopted, even manually; The gas port I11 and the gas outlet II12 are connected, which belongs to the detection working state; the connection between the interface III63 and the interface II62 means that the sampling port I81 and the sampling port II82 are connected, and the pressure of the sampling port I81 and the sampling port II82 of the micro pressure difference element 8 is the same, Belonging to zero state conduction, with zero point calibration function, the utility model eliminates the hysteresis non-linear characteristic after full-scale operation of the diffused silicon pressure sensor. Stable measurement at 0.1Pa.

In this embodiment, an automatic control system is also included; the automatic zero-clearing component includes a two-position three-way solenoid valve 6 with an interface I61, an interface II62, and an interface III63;

The automatic control system includes:

The command input unit 10 is used to input an external command; the external command refers to a general command to complete the detection, generally including start, automatic clearing, alarm start or stop and data storage, etc.

The central processing unit 3 is used to receive external commands, the differential pressure signal of the micro-pressure differential element 8 and output the control command to the control circuit 7 of the two-position three-way solenoid valve 6; the differential pressure signal of the micro-pressure differential element 8 is two-position three-way The basic data of the opening and closing of the solenoid valve 6, that is, according to the signal, it is determined whether the two-position three-way solenoid valve is in the detection position or the reset position;

The data output unit 4 is used to receive the command signal of the central processing unit 3 and output data information; the data information generally includes the display screen of the displayed wind speed and wind direction information, etc.

In this embodiment, the micro-differential pressure sampling probe 1 also includes a sampling buffer, which includes a buffer chamber housing 15 and a sampling buffer chamber I13 and a sampling buffer chamber II14 formed separately in the buffer chamber housing 15, a pressure introduction tube I16 and The pressure induction pipe II17 is connected with the air outlet I11 and the air outlet II12 through the sampling buffer chamber I13 and the sampling buffer chamber II14; a sampling buffer part is provided to avoid sudden pressure changes during the sampling process, and the impact caused by the pressure induction medium can be appropriately buffered to avoid Condensed water and dust directly act on the pressure sensor, which enhances the ability to resist the influence of dust and water vapor, and ensures the measurement accuracy and stability of the wind speed and wind direction detection device.

In this embodiment, both the pressure induction pipe I16 and the pressure induction pipe II17 adopt pitot tube structure, the ends of the pressure induction pipe I16 and the end of the pressure induction pipe II17 are bent opposite to each other and the diversion groove (drainage The groove 19 and the diversion groove 18) are arranged radially opposite each other; the diversion groove penetrates the pipe wall along the radial direction of the pressure induction pipe; the pressure induction pipe with this structure makes the diversion groove not only have the function of diversion and anti-blocking Function, but also has a pressure effect, to further ensure the accuracy of the measurement results.

In this embodiment, the automatic control system also includes an alarm unit 5 for receiving a control command from the central processing unit 3 and sending an alarm signal. The alarm unit generally includes an audible alarm, a light alarm or an acousto-optic alarm. When the line or wind direction is opposite, it will alarm; the central processing unit, the micro-pressure differential element, the two-position three-way solenoid valve and its control circuit are plastic-sealed in a housing 2, and the command input unit and data output unit 4 are located in the housing. The surface of the body 2; the plastic seal is generally fixed by epoxy resin or other plastic injection molding, and the structure of the plastic seal makes the structure strong, has good waterproof and dustproof performance, and has a strong ability to resist external forces.

In this embodiment, the automatic zero-clearing assembly further includes a three-way piece connected to the gas outlet II12, the sampling port II82 and the interface III63; the three-way connection structure makes the entire gas path neatly arranged and easy to install and disassemble.

In this embodiment, the pressure introduction pipe I16 and the pressure introduction pipe II17 are integrally formed on the same flange pressure introduction pipe flange 20, and the pressure introduction pipe flange 20 is detachably and sealed connected to the buffer chamber shell in the form of an end cover 15. The sealing method adopts the form of the sealing gasket 21, which has a simple structure and reliable sealing; the detachable structure makes the whole buffer member strong and easy to maintain.

In this embodiment, the sampling buffer chamber I13 is directly formed by the buffer chamber casing 15, and the sampling buffer chamber II14 is formed by the inner cavity of a short joint located in the buffer chamber shell 15, and the short joint is sealed from the outside by the pressure introduction pipe flange 20 And it is pressed in the buffer chamber shell 15 along its axial direction, that is, the pressure induction pipe flange 20 is connected to the buffer chamber shell 15, forming an axial pressure on the short joint, and the axial pressure makes the short joint fixed on the buffer chamber shell 15 and pressed Tightly sealed with the outside world; this structure makes the sampling buffer chamber I13 and the sampling buffer chamber II13 composed of different parts, which have relatively good sealing performance, no cross-gas phenomenon, and ensure the accuracy of the results; as shown in the figure, two sections are short-circuited Necked steps are formed. Since the flange 20 of the pressure induction pipe presses against the inner wall of the buffer shell, the necks respectively protrude out of the buffer shell 15 to connect the pressure induction pipe II17 and the tee piece 9 through the pipeline; of course , the sampling buffer chamber I13 is directly connected to the pressure introduction pipe I16 through the pressure introduction pipe flange 20, and a joint is provided at the gas outlet I11.

Fig. 5 is the detection method flowchart of the present utility model, and the utility model is used to detect the step of wind speed and wind direction:

a. Turn on the device, power on and initialize, and read the differential pressure data of the micro-pressure differential element to determine whether the device is in the reset state; The poles are in the same pressure environment and reach the set clearing time; when the clearing time is reached or the first start-up, the original will be cleared;

b. Cut off the connected state between interface II and interface III and connect interface I and interface II, introduce high pressure and low pressure through pressure induction pipe I and pressure induction pipe II, so that the micro pressure difference element detects the differential pressure caused by the wind flow, and The differential pressure signal is converted into an electrical signal and sent to the central processing unit to calculate the wind speed data signal;

c. The central processing unit outputs the electrical signal in step b to the data output unit and controls the alarm unit to alarm when the detected wind speed value is lower than the lower limit value and higher than the upper limit value or the wind direction is reversed;

In step b, the pressure introduction pipe I and the pressure introduction pipe II can be used as low-pressure and high-pressure sampling ports for each other according to the setting.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (10)

1. A two-way wind speed and wind direction monitoring system, characterized in that: comprising a micro-differential pressure sampling probe and a micro-pressure differential element; The micro-differential pressure sampling probe includes a pressure introduction pipe I and a pressure introduction pipe II for sampling, and the flow channels of the pressure introduction pipe I and the pressure introduction pipe II are respectively provided with diversion grooves. 2. The two-way wind speed and wind direction monitoring system according to claim 1, characterized in that: the pressure induction pipe I and the pressure induction pipe II are arranged symmetrically and the diversion grooves are respectively arranged along the axial direction. 3. The two-way wind speed and wind direction monitoring system according to claim 2, characterized in that: it also includes an automatic zero-clearing component, the micro-pressure differential element has a sampling port I and a sampling port II, the pressure introduction pipe I and the introduction port The pressure pipe II is connected with an air outlet I and an air outlet II; The automatic zeroing component is provided with interface I, interface II and interface III, the interface I is connected to the gas outlet I, the interface II is connected to the sampling port I, and the interface III is connected to the sampling port II; the gas outlet II is connected to the sampling port II, the switchable connection between the interface I and the interface III is connected to or closed with the interface II. 4. The two-way wind speed and wind direction monitoring system according to claim 3, characterized in that: it also includes an automatic control system; the automatic reset component includes a two-position three-way solenoid valve with interface I, interface II and interface III; The automatic control system includes: a command input unit for inputting an external command; The central processing unit is used to receive external commands, differential pressure signals of the micro-pressure differential element and output control commands to the control circuit of the two-position three-way solenoid valve; The data output unit is used for receiving command signals from the central processing unit and outputting data information. 5. The two-way wind speed and wind direction monitoring system according to claim 4, characterized in that: the micro-differential pressure sampling probe also includes a sampling buffer, and the sampling buffer includes a buffer cavity shell and a sampling buffer cavity formed separately in the buffer cavity shell I and the sampling buffer chamber II, the pressure introduction pipe I, the pressure introduction pipe II and the gas outlet I and the gas outlet II are connected through the sampling buffer chamber I and the sampling buffer chamber II correspondingly. 6. The two-way wind speed and wind direction monitoring system according to claim 5, characterized in that: the diversion groove is located at the inlet end of the pressure induction pipe I and the opening of the inlet end of the pressure induction pipe II. 7. The two-way wind speed and wind direction monitoring system according to claim 6, characterized in that: both the pressure induction pipe I and the pressure induction pipe II adopt pitot tube structure, and the end of the pressure induction pipe I and the pressure induction pipe II The ends are bent against each other, and the diversion grooves are arranged radially opposite to each other; the diversion grooves penetrate the pipe wall along the radial direction of the pressure induction pipe. 8. two-way wind speed according to claim 7, wind direction monitoring system, it is characterized in that: automatic control system also comprises the alarm unit that is used to receive the control order of central processing unit and sends alarm signal; The difference element, the two-position three-way solenoid valve and its control circuit are plastic-sealed in a casing, and the command input unit and the data output unit are located on the surface of the casing. 9. The two-way wind speed and wind direction monitoring system according to claim 8, characterized in that: the automatic zero-clearing component also includes a tee connected to the air outlet II, the sampling port II and the interface III; Ⅰ and pressure induction pipe II are fixedly connected or integrally formed on the same pressure induction pipe flange, and the pressure induction pipe flange is detachably and hermetically connected to the shell of the buffer chamber in the form of an end cover. 10. The two-way wind speed and wind direction monitoring system according to claim 9, characterized in that: the sampling buffer chamber I is directly formed by the outer shell of the buffer chamber, and the sampling buffer chamber II is formed by the sub-section inner chamber located in the outer shell of the buffer chamber, The short joint is sealed with the outside world by the flange of the pressure induction pipe and pressed in the buffer chamber shell along its axial direction.

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