CN111766023B

CN111766023B - Air leakage detector with anti-interference function

Info

Publication number: CN111766023B
Application number: CN202010619172.2A
Authority: CN
Inventors: 张斌; 孙玉涛; 王金华
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2022-03-29
Anticipated expiration: 2040-06-30
Also published as: CN111766023A

Abstract

The invention relates to an air leakage detector with an anti-interference function, which comprises a connecting rod and a U-shaped air velocity transducer, wherein the connecting rod comprises a handle, a telescopic rod and a steering hose, one end of the connecting rod is connected with the handle, and the other end of the connecting rod is connected with the steering hose; the U-shaped wind speed sensor is arranged at the tail end of the steering hose; the U-shaped wind speed sensor comprises a U-shaped pipe and a diaphragm, wherein a first overflowing hole and a second overflowing hole are respectively formed in two ends of the U-shaped pipe, the first overflowing hole, the second overflowing hole and an inner cavity of the U-shaped pipe are communicated with each other, and the diaphragm is arranged in the U-shaped pipe. A person holds the handle to send the U-shaped wind speed sensor to any detection position, air leakage airflow enters the U-shaped pipe, a whistle and a diaphragm are arranged in the U-shaped pipe, an air leakage signal is sent out through whistle and diaphragm vibration, and the air leakage is judged according to whistle or diaphragm vibration amplitude. The invention can detect the air leakage of objects with high temperature, irregular surfaces and uneasy approaching of personnel, and can measure the test environment when external wind exists.

Description

Air leakage detector with anti-interference function

Technical Field

The invention relates to a detection device, in particular to an air leakage detector with an anti-interference function.

Background

At present, no corresponding detection equipment is available for detecting the air leakage of high-temperature objects with irregular shapes, such as an air inlet system and an air outlet system of an engine. Generally, air leakage is directly sensed by hands, potential safety hazards exist in the method, and due to the fact that the surface temperature of an engine is high, the hands can only sense in a place far away, and accuracy is poor; and some parts are narrow and deep, and the hand can not extend into the part.

Disclosure of Invention

In order to solve the problems, the invention provides an air leakage detector with an anti-interference function, which is suitable for air leakage detection on high-temperature and irregular surfaces and in which people are not easy to approach.

The technical scheme adopted by the invention is as follows: the utility model provides a gas leakage detector with anti-interference function, includes hookup pole and U type air velocity transducer, its characterized in that: the connecting rod comprises a handle, a telescopic rod and a steering hose, the length of the telescopic rod can be adjusted, one end of the telescopic rod is connected with the handle, and the other end of the telescopic rod is connected with the steering hose; the steering hose can be bent at will and is stable, and the U-shaped wind speed sensor is arranged at the tail end of the steering hose; u type air velocity transducer includes U type pipe and diaphragm, U type pipe both ends are equipped with first overflowing hole and second respectively and cross the discharge orifice, first overflowing hole, second cross discharge orifice and U type intraductal intercommunication each other, the U type intraductal diaphragm that is equipped with.

Preferably, the top of the U-shaped pipe is provided with a diversion trench, and the diversion trench is communicated with the first overflowing hole and the second overflowing hole.

Preferably, the first overflowing hole and the second overflowing hole are provided with whistles.

Preferably, the U-shaped pipe is made of plastic or metal.

Preferably, the membrane is made of a transparent plastic plate.

Preferably, the handle, the telescopic rod and the hose are made of stainless steel or rubber.

The beneficial effects obtained by the invention are as follows: a person holds the handle to send the U-shaped wind speed sensor to any detection position, air leakage airflow enters the U-shaped pipe, a whistle and a diaphragm are arranged in the U-shaped pipe, an air leakage signal is sent out through whistle and diaphragm vibration, and the air leakage is judged according to whistle or diaphragm vibration amplitude. The invention can detect air leakage and the position of the air leakage point safely, quickly and intuitively, detect the air leakage of objects which have high temperature and irregular surfaces and are not suitable for people to approach, and can also measure the air leakage of a test environment when external wind exists, for example, an engine is provided with a fan or is positioned in a windy outdoor environment to detect the air leakage of an air inlet and exhaust system.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a U-shaped wind speed sensor;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a top view of FIG. 2;

FIGS. 5-6 are schematic diagrams of the present invention;

reference numerals: 11. a handle; 12. a telescopic rod; 13. a steering hose; 2. a U-shaped wind speed sensor; 21. a U-shaped pipe; 22. a membrane; 23. a whistle; 24. a diversion trench; 25. a first overflow aperture; 26. a second overflow aperture.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments.

As shown in fig. 1, the air leakage detector with the anti-interference function comprises a connecting rod and a U-shaped air velocity transducer 2, wherein the connecting rod comprises a handle 11, an expansion rod 12 and a steering hose 13, the expansion rod 12 can be adjusted in length, one end of the expansion rod is connected with the handle 11, and the other end of the expansion rod is connected with the steering hose 13; the steering hose 13 can be bent freely and stably, and the U-shaped wind speed sensor 2 is arranged at the tail end of the steering hose 13.

Referring to fig. 2-4, the U-shaped wind velocity sensor 2 includes a U-shaped tube 21 and a diaphragm 22, a first overflowing hole 25 and a second overflowing hole 26 are respectively disposed at two ends of the U-shaped tube 2, the first overflowing hole 25, the second overflowing hole 26 and an inner cavity of the U-shaped tube 21 are communicated with each other, and the diaphragm 22 is disposed in the inner cavity of the U-shaped tube 21. The top of the U-shaped pipe 21 is provided with a diversion trench 24, and the diversion trench 24 is communicated with a first overflowing hole 25 and a second overflowing hole 26 and is used for introducing airflow into the overflowing holes.

In this embodiment, the whistle 23 is disposed at the openings of the first overflowing hole 25 and the second overflowing hole 26, and the whistle 23 can make a whistle sound when an air flow passes through the whistle. The whistle 23 can also be eliminated if the diaphragm 21 is made of a transparent plastic plate.

The U-shaped pipe 21 is made of plastic, and can be made of metal for a test environment with high air leakage temperature (about 200 ℃). The handle 11, the telescopic rod 12 and the steering hose 13 are made of stainless steel or rubber

The invention is used for detecting the air leakage of a sealed object with high temperature, normal temperature and irregular shape, can shield the interference of external wind on occasions with the external wind on site, such as the condition that an engine is provided with a fan, outdoor windy weather and the like, and can quickly and accurately diagnose whether the object has air leakage or not and find an air leakage point.

The working principle is as follows:

when an air flow with velocity Vu exists in the U-shaped tube 21, the diaphragm 22 deflects and vibrates, the whistle 23 makes a sound, and the amplitude of the deflection and the whistle magnitude increase as Vu increases.

With reference to fig. 5, the principle of missing dot detection: when the U-shaped tube 21 moves from left to right along the surface of the object to be detected, at the position A, the leakage point airflow does not enter the U-shaped tube 21, and Vu is 0; at the position B, airflow is blown into the hole 2, Vu is greater than 0 and goes leftward, a whistle is sounded, and the diaphragm deflects leftward; at position C, hole 1 is blown with air flow, Vu >0, to the right, whistling, diaphragm to the right, Vu size is determined by the leakage point air flow velocity Vd, Vu ≈ Vd.

The basis for judging whether the missing point exists is as follows: firstly, whistle is whistling; secondly, the size of the whistling film has sudden changes.

External wind interference resisting principle:

referring to fig. 6, when external wind reaches the surface of the object to be detected, the wind direction is parallel to the surface of the object, Vu is determined by the pressure difference between holes 1 and 2, and the pressure difference is determined by the difference between wind speeds V1 and V2. For laminar flow between two planes, V1 ≈ V2, and the diversion trench 24 can further reduce the difference between V1 and V2; thus, even in the presence of a large external wind Vh, Vu will be small, even 0; when the U-tube 21 moves along the detection surface, the change is relatively slow even if Vu is present.

For non-planar objects, a small-size U-shaped tube 21 is adopted, the detection surface is locally similar to a plane, and the effect of resisting external wind interference can be achieved.

The basis of resisting external wind interference is as follows: the whistle-ringing membrane has little or no movement, and the whistle-ringing membrane has smooth change in size.

The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a gas leakage detector with anti-interference function, includes hookup pole and U type air velocity transducer, its characterized in that: the connecting rod comprises a handle, a telescopic rod and a steering hose, the length of the telescopic rod can be adjusted, one end of the telescopic rod is connected with the handle, and the other end of the telescopic rod is connected with the steering hose; the steering hose can be bent at will and is stable, and the U-shaped wind speed sensor is arranged at the tail end of the steering hose; the U-shaped wind speed sensor comprises a U-shaped pipe and a diaphragm, a first overflowing hole and a second overflowing hole are respectively arranged at two ends of the U-shaped pipe, the first overflowing hole, the second overflowing hole and an inner cavity of the U-shaped pipe are communicated with each other, and the diaphragm is arranged in the U-shaped pipe;

a diversion trench is arranged at the top of the U-shaped pipe and communicated with the first overflowing hole and the second overflowing hole.

2. The air leakage detector with the anti-interference function according to claim 1, characterized in that: and the orifices of the first overflowing hole and the second overflowing hole are provided with whistles.

3. The air leakage detector with the anti-interference function according to claim 1, characterized in that: the U-shaped pipe is made of plastic or metal.

4. The air leakage detector with the anti-interference function according to claim 1, characterized in that: the diaphragm is made of transparent plastic plate.

5. The air leakage detector with the anti-interference function according to claim 1, characterized in that: the handle, the telescopic rod and the hose are made of stainless steel or rubber.