CN218240085U

CN218240085U - Novel pitot tube flow velocity measuring equipment

Info

Publication number: CN218240085U
Application number: CN202222625322.8U
Authority: CN
Inventors: 向德臣; 林东平
Original assignee: Shenzhen Treeland Technology Co ltd
Current assignee: Shenzhen Treeland Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-01-06
Anticipated expiration: 2032-09-30

Abstract

The utility model provides a novel pitot tube velocity measuring equipment, include: the control main board, the first electromagnetic valve, the second electromagnetic valve and the gas tank are arranged; the control main board is also provided with a first sensor and a second sensor, and the first sensor and the second sensor are respectively connected with a P port of a first electromagnetic valve and a P port of a second electromagnetic valve; the air tank is respectively connected with R ports of the first electromagnetic valve and the second electromagnetic valve, A ports of the first electromagnetic valve and the second electromagnetic valve are respectively connected with a pitot tube back pressure and a pitot tube full pressure, and B ports of the first electromagnetic valve and the second electromagnetic valve are communicated with the atmosphere. The utility model realizes back flushing through the first electromagnetic valve and the second electromagnetic valve, thereby avoiding the measurement error caused by the blockage of the pitot tube; the third electromagnetic valve is electrified to close the air source, and the first electromagnetic valve and the second electromagnetic valve are simultaneously electrified to realize automatic zero marking after the compressed air in the air tank is completely discharged.

Description

Novel pitot tube flow velocity measuring equipment

Technical Field

The utility model relates to an environment measuring equipment technical field, concretely relates to novel pitot tube velocity measuring equipment.

Background

The method adopts a common method for measuring the flow velocity of gas by a Pitot tube, is widely applied in industrial processes, adopts two pipes facing the wind and the leeward to be connected with a pressure sensor, obtains the dynamic pressure value of the measured gas by measuring the pressure difference between the windward side and the leeward side, solves the flow velocity of the fluid by a Bernoulli equation,

the existing test equipment has the following defects:

1. the automatic zero-marking can not be realized, or at least one electromagnetic valve is needed to meet the zero-marking function, the cost is higher, and the connecting pipe is more complex);

2. after the use, the pitot tube is blocked, so that the measurement precision is greatly reduced, and high-pressure gas is easy to leak to a differential pressure sensor during back flushing, so that the sensor is damaged due to high pressure;

therefore, it is necessary to develop a new device to solve the above problems.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides a novel pitot tube velocity measuring equipment.

In order to achieve the above purpose, the specific scheme of the utility model is as follows:

the utility model provides a novel pitot tube velocity measuring equipment, include: the control main board, the first electromagnetic valve and the second electromagnetic valve;

the control main board is also provided with a first sensor and a second sensor, and the first sensor and the second sensor are respectively connected with a port P of the first electromagnetic valve and a port P of the second electromagnetic valve;

the port A of the first electromagnetic valve and the port A of the second electromagnetic valve are respectively connected with a pitot tube back pressure and a pitot tube full pressure, and the port B of the first electromagnetic valve and the port B of the second electromagnetic valve are communicated with the atmosphere or are connected in series by a pipe.

Furthermore, the port R of the first solenoid valve and the port R of the second solenoid valve are also respectively communicated with the port P of a third solenoid valve.

Furthermore, the port A of the third electromagnetic valve is communicated with compressed air, the third electromagnetic valve is not limited to the inlet of compressed air A and the outlet of compressed air P, otherwise, the third electromagnetic valve can be any two-position three-way electromagnetic valve capable of realizing on-off, and can be a direct-acting type pilot valve or an internal (external) pilot valve.

Further, the port B of the third electromagnetic valve is open to the atmosphere.

Further, the R port of the first electromagnetic valve and the R port of the second electromagnetic valve are communicated with the P port of a third electromagnetic valve through a gas tank.

Furthermore, the first electromagnetic valve and the second electromagnetic valve are both external pilot five-port two-position electromagnetic valves.

Further, the third electromagnetic valve is an external pilot five-port two-position electromagnetic valve, an internal pilot two-position three-way valve or a direct-acting two-position three-way valve.

Further, the port P is communicated with the port A under the normal state of the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, and the port R and the port S are closed; under the power-on suction state, the port A is communicated with the port R, and the port P is communicated with the port B.

Further, the first sensor and the second sensor are both differential pressure sensors.

Adopt the technical scheme of the utility model, following beneficial effect has:

1. the back flushing is realized through the first electromagnetic valve and the second electromagnetic valve, so that the measurement error caused by the blockage of the pitot tube is avoided;

2. the third electromagnetic valve is electrified to close the air source, and the first electromagnetic valve and the second electromagnetic valve are simultaneously electrified to realize automatic zero marking after the compressed air in the air tank is completely discharged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

in the figure: 1. a first solenoid valve; 2. a second solenoid valve; 3. a third solenoid valve; 4. a first sensor; 5. a second sensor; 6. a main board; 7. a gas tank; 8. pitot tube back pressure; 9. full pressure of a pitot tube; 10. atmospheric air; 11. and (5) compressing the gas.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "front", "rear", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, the utility model provides a novel pitot tube velocity measuring equipment, include: the control main board 6, the first electromagnetic valve 1 and the second electromagnetic valve 2; the control main board 6 is also provided with a first sensor 4 and a second sensor 5, and the first sensor 4 and the second sensor 5 are respectively connected with a port P of the first electromagnetic valve 1 and a port P of the second electromagnetic valve 2; the port A of the first electromagnetic valve 1 and the port A of the second electromagnetic valve 2 are respectively connected with a pitot tube back pressure 8 and a pitot tube full pressure 9, and the port B of the first electromagnetic valve 1 and the port B of the second electromagnetic valve 2 are communicated with the atmosphere 10 or communicated in series by pipes.

The R port of the first electromagnetic valve 1 and the R port of the second electromagnetic valve 2 are also respectively communicated with a P port of a third electromagnetic valve 3, the A port of the third electromagnetic valve 3 is communicated with compressed air 11, the third electromagnetic valve 3 is not limited to A inlet compressed air 11 and P outlet compressed air, otherwise, the two-position three-way electromagnetic valve capable of realizing on-off can be any, and the two-position three-way electromagnetic valve can be a direct-acting type or an internal (external) pilot valve. The port B of the third electromagnetic valve 3 is open to the atmosphere 10.

The R port of the first electromagnetic valve 1 and the R port of the second electromagnetic valve 2 are communicated with a P port of a third electromagnetic valve 3 through an air tank 7, the first electromagnetic valve 1 and the second electromagnetic valve 2 are external pilot five-port two-position electromagnetic valves, and the third electromagnetic valve 3 is an external pilot five-port two-position electromagnetic valve or an internal pilot two-position three-way valve or a direct-acting two-position three-way valve.

The port P is communicated with the port A under a normal state of the first electromagnetic valve 1, the second electromagnetic valve 2 and the third electromagnetic valve 3, and the port R and the port S are closed; in the electrified attraction state, the port A is communicated with the port R, and the port P is communicated with the port B; the first sensor 4 and the second sensor 5 are differential pressure sensors.

The utility model discloses the principle as follows:

1. the first electromagnetic valve 1 performs back blowing;

first 1 circular telegram blowbacks of solenoid valve (R mouth leads to A mouth, and P mouth leads to B mouth), before the blowback ended, the circular telegram of third solenoid valve 3 closed 11 air supplies of compressed gas and make gas pitcher 7 pressure release (A leads to R, and R mouth is blockked up, and P mouth leads to B mouth simultaneously, and the gas of gas pitcher 7 is released), then 1 outage of first solenoid valve resumes the measurement of differential pressure burden, and then the 3 outage gas pitchers 7 of third solenoid valve resume the air feed.

2. The second electromagnetic valve 2 performs back flushing;

the second electromagnetic valve 2 is electrified for back flushing, before the back flushing is finished, the third electromagnetic valve 3 is electrified for closing the compressed air 11 source and relieving the pressure of the air tank 7, then the second electromagnetic valve 2 is powered off, and then the third electromagnetic valve 3 is powered off for recovering the air supply of the air tank 7.

3. Pitot tube flow rate zero mark;

the first scheme is as follows: the third electromagnetic valve 3 is electrified to close the air source, and the first electromagnetic valve 1 and the second electromagnetic valve 2 are simultaneously electrified to be zero-standard after the compressed air 11 in the air tank 7 is completely discharged;

zero marking: that is, two ports of the differential pressure sensor are both led to the atmosphere 10, the pressures at the two ends are kept equal, and then zero calibration is carried out on the sensor.

Scheme II: the first electromagnetic valve 1 and the second electromagnetic valve 2 are simultaneously electrified, so that full pressure 9 and back pressure 8 of the pitot tube can be simultaneously subjected to back blowing, meanwhile, two ports of the pitot tube differential pressure sensor are conducted (simultaneously communicated with the atmosphere 10 inside or outside the case, or can be connected with ports A of the two electromagnetic valves in a short circuit mode through pipes), and the automatic zero-mark function of flow rate can be realized.

The gas tank 7 is used for increasing the back flushing flow and improving the back flushing effect, and the differential pressure sensor can be protected without the gas tank 7.

The purpose of adding a third electromagnetic valve 3 to close the air source is as follows:

if the third electromagnetic valve 3 is not arranged, at the end of the back flushing, a small amount of compressed air 11 leaks to a P port communicated with the differential pressure sensor due to the instant action of a valve core of the electromagnetic valve, and if the leakage pressure is overlarge, the differential pressure sensor can damage the sensor due to the fact that the differential pressure sensor reaches a pressure-resistant limit.

Or the compressed air 11 which is blown back due to the blockage of the pitot tube is stored in the pipeline and is not discharged, and when the A port and the P port are communicated after the blowback is finished, the non-discharged compressed air 11 flows to the differential pressure sensor, so that the sensor is damaged by high pressure.

The above only is the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the protection scope of the present invention.

Claims

1. A novel pitot tube flow rate measurement device, comprising: the control main board (6), the first electromagnetic valve (1) and the second electromagnetic valve (2);

the control main board (6) is also provided with a first sensor (4) and a second sensor (5), and the first sensor (4) and the second sensor (5) are respectively connected with a port P of the first electromagnetic valve (1) and a port P of the second electromagnetic valve (2);

the port A of the first electromagnetic valve (1) and the port A of the second electromagnetic valve (2) are respectively connected with a pitot tube back pressure (8) and a pitot tube full pressure (9), and the port B of the first electromagnetic valve (1) and the port B of the second electromagnetic valve (2) are communicated with the atmosphere (10) or are connected in series through a pipe.

2. The pitot tube flow rate measuring device according to claim 1, wherein the R port of the first electromagnetic valve (1) and the R port of the second electromagnetic valve (2) are respectively communicated with the P port of a third electromagnetic valve (3).

3. The pitot tube flow rate measuring device according to claim 2, characterized in that the port a of the third solenoid valve (3) is in communication with compressed air (11).

4. A new pitot tube flow rate measuring device according to claim 3, characterized in that B port of the third solenoid valve (3) is open to atmosphere (10).

5. The pitot tube flow rate measuring device according to claim 2, characterized in that the R port of the first solenoid valve (1) and the R port of the second solenoid valve (2) are communicated with the P port of a third solenoid valve (3) through a gas tank (7).

6. The novel pitot tube flow rate measuring device as claimed in claim 2, wherein the first solenoid valve (1) and the second solenoid valve (2) are both external pilot five-port two-position solenoid valves.

7. The pitot tube flow rate measuring device according to claim 6, characterized in that the third solenoid valve (3) is an external pilot five-port two-position solenoid valve or an internal pilot two-position three-way valve or a direct-acting two-position three-way valve.

8. The novel pitot tube flow rate measuring device as claimed in claim 7, wherein the first solenoid valve (1), the second solenoid valve (2) and the third solenoid valve (3) are communicated with a port P and a port A under a normal state, and the port R and the port S are closed; under the power-on suction state, the port A is communicated with the port R, and the port P is communicated with the port B.

9. The novel pitot tube flow rate measuring device of claim 1, wherein the first sensor (4) and the second sensor (5) are both differential pressure sensors.