CN211085360U

CN211085360U - Thermal mass sensor

Info

Publication number: CN211085360U
Application number: CN201921787928.3U
Authority: CN
Inventors: 李争; 李亢平
Original assignee: Hangzhou Lihua Science & Technology Co ltd
Current assignee: Hangzhou Lihua Science & Technology Co ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-07-24
Anticipated expiration: 2029-10-23

Abstract

The utility model discloses a hot type mass sensor, its characterized in that: the flow sensor comprises a flow sensing chip, a signal amplification PCB, a four-core socket plug, a pipeline and a shell, wherein a through hole for connecting a gas channel is formed in the pipeline, the flow sensing chip is installed in the gas channel through an installation plate, the flow sensing chip is electrically connected with the four-core socket plug through the signal amplification PCB, the shell seals the flow sensing chip and the signal amplification PCB on the pipeline, and the four-core socket plug is installed on the shell and is electrically connected with an external instrument display. The utility model discloses can not produce the heat disorder because of crossing low of the velocity of flow, measuring precision and stability are good, stabilize the gas flow rate through the current stabilizer.

Description

Thermal mass sensor

Technical Field

The utility model relates to a sensor, the utility model relates to a hot type mass sensor.

Background

The thermal air mass flow sensor is a sensor for measuring the current air mass flow by utilizing the heat exchange relationship between a heating substance in an air flow and the measured air, and the air mass flow refers to the mass of air flowing in unit time. The thermal flow sensor uses a heating resistor made of metal wire winding as a heating substance. The heating resistor is placed in the air flow, the surface of the heating resistor exchanges heat with the air, certain parameters of the heat exchange are detected through the sensor circuit, and the gas flow near the heating resistor is obtained, so that the gas flow of the whole pipeline is calculated.

Because the sensor judges the airflow flow by detecting the heat exchange degree between the heating resistor and the air flow, the flowing state of the intake air has a great influence on the measurement result of the sensor. For this reason, the thermal mass air flow sensors of the prior art all improve the stability of the intake air as much as possible.

The existing thermal flow sensor can stabilize the air near the heating element, thereby improving the measurement precision. However, when the air flows through the heating resistor, thermal disturbance may occur if the flow rate is too low, which may also distort the measurement result, and decrease the measurement accuracy and stability, and the conventional thermal flow sensor has no solution to this problem.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a hot type mass sensor.

The utility model provides a technical scheme that above-mentioned technical problem adopted is:

the utility model discloses a hot type mass sensor, it includes flow sensing chip, signal amplification PVC board, four-core socket plug, pipeline, shell, it has the through-hole of connecting gas passage to open on the pipeline, through mounting panel installation flow sensing chip in gas passage, flow sensing chip passes through the signal and amplifies the PCB board and is connected with four-core socket plug electricity, the shell is sealed flow sensing chip, signal amplification PCB board on the pipeline, four-core socket plug install on the shell and with outside instrument display electricity be connected. The sensor adopts the flow sensing chip to collect signals, cannot generate thermal disorder due to too low flow velocity, and has good measurement precision and stability.

The filter discs are arranged at the two ends of the gas channel, and impurities are filtered through the filter discs, so that the measurement precision is improved.

The flow sensing chip is formed by arranging an insulating film on a silicon substrate and coating a thermistor on the film by adopting an MEMS (micro-electromechanical systems) process.

The signal amplification PCB is provided with a signal amplification circuit connected with the thermistor of the flow sensing chip. The signal amplifying circuit filters the signal through the filter circuit, and then the signal is amplified by the power amplifier circuit and then is sent to an external display instrument through the four-core socket plug.

The pipeline is provided with a flow stabilizer, and the flow stabilizer is arranged between the air inlet and the air outlet between the air channel and the pipeline, and the channel is divided into a plurality of small channels. The incoming gas is diverted through small channels so that the outgoing gas is not unstable by the change in the incoming gas.

And a layer of heat insulation film is arranged on the mounting plate for mounting the flow sensing chip.

The utility model has the advantages that:

the utility model discloses can not produce the heat disorder because of crossing low of the velocity of flow, measuring precision and stability are good, stabilize the gas flow rate through the current stabilizer.

Drawings

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

In the figure: 1. the device comprises a filter disc, 2, a flow sensing chip, 3, a signal amplification PCB, 4, a four-core socket plug, 5, a current stabilizer, 6, a channel, 7, a shell, 8, a pipeline, 9 and a through hole.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

As shown in fig. 1, the utility model relates to a hot type mass sensor, it includes the cassette, the flow sensing chip, the signal amplification PCB board, four-core socket plug, the pipeline, and a housing, the current stabilizer, gas passage, it has the through-hole of connecting gas passage to open on the pipeline, install the current stabilizer in the pipeline and between inlet port and venthole between gas passage and pipeline, install the cassette at gas passage both ends, install the flow sensing chip in gas passage, the flow sensing chip passes through the signal amplification PCB board and is connected with four-core socket plug electricity, the shell is with the flow sensing chip, the signal amplification PCB board is sealed on the pipeline, four-core socket plug install on the shell and show the electricity with outside instrument and be connected.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The same creation is considered to be simply replaced without changing the creation content of the present invention. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal mass sensor, characterized by: the flow sensor comprises a flow sensing chip, a signal amplification PCB, a four-core socket plug, a pipeline and a shell, wherein a through hole for connecting a gas channel is formed in the pipeline, the flow sensing chip is installed in the gas channel through an installation plate, the flow sensing chip is electrically connected with the four-core socket plug through the signal amplification PCB, the shell seals the flow sensing chip and the signal amplification PCB on the pipeline, and the four-core socket plug is installed on the shell and is electrically connected with an external instrument display.

2. The thermal mass sensor of claim 1, wherein: the filter plates are arranged at the two ends of the gas channel, and impurities are filtered through the filter plates, so that the measurement precision is improved.

3. The thermal mass sensor of claim 1, wherein: the quantity sensing chip is formed by arranging an insulating film on a silicon substrate and coating a thermistor on the film by adopting an MEMS (micro-electromechanical systems) process.

4. The thermal mass sensor of claim 1, wherein: the signal amplifying PCB is provided with a signal amplifying circuit which is connected with a thermistor of the flow sensing chip, the signal amplifying circuit filters the signal through a filter circuit, and the signal amplifying circuit amplifies the signal and transmits the amplified signal to an external display instrument through a four-core socket plug.

5. The thermal mass sensor of claim 1, wherein: the pipeline is provided with a flow stabilizer, and the flow stabilizer is arranged between the air inlet and the air outlet between the air channel and the pipeline, and the channel is divided into a plurality of small channels.

6. The thermal mass sensor of claim 1, wherein: and a layer of heat insulation film is arranged on the mounting plate for mounting the flow sensing chip.