CN212134572U

CN212134572U - Oxygen concentration and oxygen flow sensor

Info

Publication number: CN212134572U
Application number: CN202020942268.8U
Authority: CN
Inventors: 赵华琳; 王礼魁
Original assignee: Zhaosi Technology Shenzhen Co ltd
Current assignee: Zhaosi Technology Shenzhen Co ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2020-12-11
Anticipated expiration: 2030-05-29

Abstract

The utility model discloses an oxygen concentration and oxygen flow sensor, including the gas circuit structure, ultrasonic wave takes place receiving arrangement and has the circuit board of signal processing circuit, ultrasonic wave takes place receiving arrangement is all installed at the both ends of gas circuit structure, and the gas circuit structure includes outer pipeline and inner tube, and the both ends of outer pipeline all are provided with opening A, install ultrasonic wave in the opening A and take place receiving arrangement, and the one end of inner tube is provided with opening B, and the other end of inner tube is provided with opening C, outer pipeline, inner tube and two ultrasonic wave take place that receiving arrangement encloses to become to have air inlet cavity and air outlet cavity. The utility model discloses oxygen concentration and oxygen flow sensor measure accurately, and the error is little, and flow measurement signal is big, and the signal to noise ratio is high, based on the utility model discloses to local vortex disturbance and the improvement of showing of SNR, oxygen concentration and oxygen flow sensor can further shorten length, realize the miniaturization under the prerequisite that satisfies product performance.

Description

Oxygen concentration and oxygen flow sensor

Technical Field

The utility model relates to a sensor technical field specifically is an oxygen concentration and oxygen flow sensor.

Background

The existing oxygen concentration and oxygen flow sensor comprises a gas path pipeline with openings at two ends, an ultrasonic wave generation receiving device respectively arranged at the openings at two ends of the gas path pipeline and a circuit board with a measurement and processing circuit. The gas path pipeline also comprises a gas inlet interface and a gas outlet interface which are positioned on the side wall of the pipeline and used for leading in and removing the gas to be detected. Meanwhile, the pipeline is also provided with a temperature measurement opening for installing a temperature measurement probe in the pipeline to measure the temperature of the gas in the pipeline.

Problems with such oxygen concentration and flow sensors are:

1. the measurement is inaccurate, and the error is big, and the gas that is surveyed gets into the gas circuit pipeline through the interface of admitting air and prolongs the gas circuit pipeline and flow to the interface of giving vent to anger and discharge, and the gas circuit pipeline is interior to produce local vortex disturbance with the interface of admitting air and the interface handing-over position of giving vent to anger, and direct interference is located gas circuit pipeline both ends ultrasonic wave and takes place receiving arrangement, leads to measuring inaccurately, and the error is big.

2. The signal-to-noise ratio of flow measurement signal is low, for avoiding the influence of local vortex, the interface of will admitting air usually with the interface of giving vent to anger keep away from the ultrasonic wave generation receiving arrangement at both ends, lead to admitting air the interface and give vent to anger the distance between the interface and reduce, this distance is the effective distance of velocity of flow measurement among the current scheme, oxygen concentration and oxygen flow sensor calculate velocity of flow and flow through gathering the time difference of positive, reverse sound velocity transmission in this section distance, this distance is little leads to flow measurement signal's signal-to-noise ratio to be low.

3. Longer gas circuit pipeline is difficult to miniaturize, for avoiding the influence of local vortex and obtaining ideal signal to noise ratio, on the one hand the air inlet and the interface of giving vent to anger need keep away from the ultrasonic wave that is located gas circuit pipeline both ends and take place receiving arrangement, on the other hand will increase air inlet and interface distance of giving vent to anger, lead to longer gas circuit pipeline, are difficult to miniaturize.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oxygen concentration and oxygen flow sensor, it is accurate to measure, and the error is little, and flow measurement signal is big, and the signal to noise ratio is high, can reduce the length of main pipeline, and the miniaturization of being convenient for can solve the problem among the prior art.

In order to achieve the above object, the utility model provides a following technical scheme: an oxygen concentration and oxygen flow sensor comprises a gas path structure, an ultrasonic generation receiving device and a circuit board with a signal processing circuit, wherein the ultrasonic generation receiving device is arranged at both ends of the gas path structure, the gas path structure is arranged on the circuit board and comprises an outer pipeline and an inner pipeline, both ends of the outer pipeline are provided with openings A, the ultrasonic generation receiving device is arranged in the openings A, one end of the inner pipeline is provided with an opening B, the other end of the inner pipeline is provided with an opening C, the outer pipeline, the inner pipeline and the two ultrasonic generation receiving devices are enclosed to form an air inlet cavity and an air outlet cavity, the air inlet cavity and the air outlet cavity are communicated through the openings B and the openings C which are respectively arranged at both ends of the inner pipeline, an air inlet interface is arranged on the pipe wall of the outer pipeline and is communicated with the air inlet cavity, the pipe wall of the outer pipeline is also provided with an air outlet interface which is communicated with the air outlet cavity.

Preferably, the inner pipe is located inside the outer pipe and parallel to the outer pipe.

Preferably, a temperature measuring opening is formed in the side wall of the outer pipeline, and the temperature measuring opening is communicated with an opening B and an opening C which are formed in two ends of the inner pipeline respectively.

Preferably, the circuit board is provided with a driving circuit of the ultrasonic generating and receiving device and a signal collecting and processing circuit, and the two ultrasonic generating and receiving devices are electrically connected with the driving circuit of the ultrasonic generating and receiving device and the signal collecting and processing circuit.

Preferably, the circuit board is provided with a temperature element mounted in the temperature measurement opening.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model discloses oxygen concentration and oxygen flow sensor measure accurately, and the error is little, and the air current in the interior conduit is effective measurement section, and its inside air current is even steady, and it is small to the ultrasonic wave generation receiving arrangement influence at gas circuit structure both ends that the measured gas is at the cavity that admits air and the internal local vortex disturbance of cavity that gives vent to anger.

2. The utility model discloses oxygen concentration and oxygen flow sensor, flow measurement signal are big, and the SNR is high, and the length of interior pipeline is promptly for effective measurement section, under the condition that the whole length of pipeline is the same, the utility model discloses effective measurement section can be greater than the interface of admitting air and give vent to anger the distance between the interface, is showing and promotes the SNR.

3. The utility model discloses oxygen concentration and oxygen flow sensor can reduce the length of main pipeline, are convenient for miniaturize, based on the utility model discloses to the improvement of showing of local vortex disturbance and SNR, oxygen concentration and oxygen flow sensor can further shorten length, realize the miniaturization under the prerequisite that satisfies product performance.

Drawings

FIG. 1 is a schematic diagram of an oxygen concentration and flow sensor of the present invention;

FIG. 2 is a top view of the oxygen concentration and flow sensor of the present invention;

FIG. 3 is a longitudinal cross-sectional view of an oxygen concentration and flow sensor of the present invention;

fig. 4 is a transverse cross-sectional view of the oxygen concentration and flow sensor of the present invention.

In the figure: 1. a gas path structure; 2. an ultrasonic wave generating and receiving device; 3. a circuit board; 4. an outer conduit; 5. an inner conduit; 6. opening the temperature measurement; 7. an opening A; 8. an opening B; 9. an opening C; 10. an air inlet cavity; 11. an air outlet cavity; 12. an air inlet interface; 13. an air outlet interface.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-4, an oxygen concentration and oxygen flow sensor comprises a gas circuit structure 1, an ultrasonic generation receiving device 2 and a circuit board 3 with a signal processing circuit, wherein the ultrasonic generation receiving device 2 is installed at both ends of the gas circuit structure 1, the gas circuit structure 1 is installed on the circuit board 3, the circuit board 3 is provided with an ultrasonic generation receiving device driving circuit and a signal acquisition processing circuit, the two ultrasonic generation receiving devices 2 are electrically connected with the ultrasonic generation receiving device driving circuit and the signal acquisition processing circuit, the circuit board 3 is provided with a temperature element installed in a temperature measurement opening 6, the gas circuit structure 1 comprises an outer pipeline 4 and an inner pipeline 5, the inner pipeline 5 is positioned inside the outer pipeline 4 and is parallel to the outer pipeline 4, the side wall of the outer pipeline 4 can be provided with other gas circuit interfaces for detecting the pressure of gas flowing through the pipeline, other interfaces can be communicated with the air inlet cavity 10, the air outlet cavity 11 or the inner pipeline 5, two ends of the outer pipeline 4 are respectively provided with an opening A7, an ultrasonic generation receiving device 2 is arranged in an opening A7, one end of the inner pipeline 5 is provided with an opening B8, the other end of the inner pipeline 5 is provided with an opening C9, the side wall of the outer pipeline 4 is provided with a temperature measuring opening 6, the temperature measuring opening 6 is communicated with an opening B8 and an opening C9 which are respectively arranged at two ends of the inner pipeline 5, the outer pipeline 4, the inner pipeline 5 and the two ultrasonic generation receiving devices 2 are enclosed to form an air inlet cavity 10 and an air outlet cavity 11, the air inlet cavity 10 and the air outlet cavity 11 are communicated through an opening B8 and an opening C9 which are respectively arranged at two ends of the inner pipeline 5, the pipe wall of the outer pipeline 4 is provided with an air inlet interface 12, the air inlet interface 12 is communicated with the air inlet cavity 10, the pipe, the oxygen concentration sensor can be used only as an oxygen concentration sensor or only as an oxygen flow sensor through the tailoring of software functions or the control of transmitted data.

The working principle is as follows: the measured gas flows into the gas inlet cavity 10 through the gas inlet interface 12, then flows into the opening B8 at one end of the inner pipeline 5, flows out through the opening C9 at the other end of the inner pipeline 5, and finally flows out through the gas outlet interface 13, wherein the temperature of the measured gas can be measured by contacting a temperature sensor at the temperature interface in the flowing process of the inner pipeline 5, the temperature is used for compensation calculation of the sensor, the ultrasonic wave generating and receiving devices 2 at the openings A7 at the two ends of the outer pipeline 4 alternately send and receive ultrasonic wave signals, the signal processing circuit collects and calculates the time of ultrasonic wave transmission in the inner pipeline 5, the ultrasonic wave transmission speed in the gas with different oxygen concentrations is different, therefore, the oxygen concentration in the inner pipeline 5 and the transmission time form a nearly linear relationship, the oxygen concentration is calculated according to the transmission time, and meanwhile, the forward and reverse transmission time of the ultrasonic wave in the inner pipeline 5 are the same under the, however, under the condition of flow velocity, the forward transmission time and the reverse transmission time have a difference value, and the difference value and the flow velocity form a nearly linear relation, so the signal processing circuit calculates the flow of the measured gas according to the time difference value.

In summary, the oxygen concentration and oxygen flow sensor of the utility model has accurate measurement and small error, the air flow in the inner pipeline 5 is an effective measurement section, the internal airflow is uniform and stable, the local eddy disturbance of the measured gas in the air inlet cavity 10 and the air outlet cavity 11 has little influence on the ultrasonic generation receiving devices 2 at the two ends of the air path structure 1, the flow measurement signal is large, the signal-to-noise ratio is high, the length of the inner pipeline 5 is an effective measurement section, under the condition that the whole length of the pipeline is the same, the effective measuring section of the utility model can be larger than the distance between the air inlet interface 12 and the air outlet interface 13, the signal-to-noise ratio is obviously improved, can reduce the length of total pipeline, be convenient for miniaturize, based on the utility model discloses to local vortex disturbance and the improvement of showing of SNR, oxygen concentration and oxygen flow sensor can further shorten length, realize the miniaturization under the prerequisite that satisfies product performance.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an oxygen concentration and oxygen flow sensor, includes gas circuit structure (1), ultrasonic wave generation receiving arrangement (2) and circuit board (3) that have signal processing circuit, its characterized in that: the ultrasonic wave generating and receiving device comprises an air path structure (1), wherein ultrasonic wave generating and receiving devices (2) are respectively arranged at two ends of the air path structure (1), the air path structure (1) is arranged on a circuit board (3), the air path structure (1) comprises an outer pipeline (4) and an inner pipeline (5), openings A (7) are respectively arranged at two ends of the outer pipeline (4), the ultrasonic wave generating and receiving devices (2) are arranged in the openings A (7), an opening B (8) is arranged at one end of the inner pipeline (5), an opening C (9) is arranged at the other end of the inner pipeline (5), an air inlet cavity (10) and an air outlet cavity (11) are defined by the outer pipeline (4), the inner pipeline (5) and the two ultrasonic wave generating and receiving devices (2) in a surrounding manner, the air inlet cavity (10) and the air outlet cavity (11) are communicated through the openings B (8) and the openings C (9), be provided with on outer pipeline (4) pipe wall and admit air interface (12), admit air interface (12) and admit air cavity (10) intercommunication, still be provided with interface (13) of giving vent to anger on outer pipeline (4) pipe wall, interface (13) of giving vent to anger communicate with the cavity of giving vent to anger (11).

2. An oxygen concentration and flow sensor according to claim 1, wherein: the inner pipeline (5) is positioned inside the outer pipeline (4) and is parallel to the outer pipeline (4).

3. An oxygen concentration and flow sensor according to claim 1, wherein: the temperature measurement device is characterized in that a temperature measurement opening (6) is formed in the side wall of the outer pipeline (4), and the temperature measurement opening (6) is communicated with an opening B (8) and an opening C (9) which are formed in two ends of the inner pipeline (5) respectively.

4. An oxygen concentration and flow sensor according to claim 1, wherein: the ultrasonic wave generating and receiving device is characterized in that an ultrasonic wave generating and receiving device driving circuit and a signal acquisition and processing circuit are arranged on the circuit board (3), and the two ultrasonic wave generating and receiving devices (2) are electrically connected with the ultrasonic wave generating and receiving device driving circuit and the signal acquisition and processing circuit.

5. An oxygen concentration and flow sensor according to claim 1, wherein: the circuit board (3) is provided with a temperature element arranged in the temperature measuring opening (6).