CN216285042U

CN216285042U - Solid polymer sensor module and formaldehyde detection equipment

Info

Publication number: CN216285042U
Application number: CN202122623395.9U
Authority: CN
Inventors: 李德虎; 王庆; 王道涛
Original assignee: Ningbo Air Quality Systems Co ltd
Current assignee: Ningbo Air Quality Systems Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-12
Anticipated expiration: 2031-10-29

Abstract

The utility model provides a solid polymer sensor module, which comprises an electrochemical sensor and a circuit board, wherein the electrochemical sensor comprises an upper shell, a base and a chip, the upper shell and the base are covered to form a cavity, the chip is fixedly arranged in the cavity, a plurality of pin pins are fixedly arranged on the base, each pin is provided with a first end and a second end which are opposite, the first end is connected with the circuit board, the second end is connected with the chip in a contact way, the chip is provided with a waterproof breathable film, and the waterproof breathable film is suitable for preventing moisture in gas to be detected from entering a reaction medium on the chip. The utility model also provides formaldehyde detection equipment which comprises the solid polymer sensor module. According to the utility model, the waterproof breathable film is arranged on the chip, so that the moisture in the gas to be detected which reacts with the reaction medium can be reduced, the influence of humidity on the detection effect of the electrochemical sensor is reduced, and the stability of the electrochemical sensor is improved.

Description

Solid polymer sensor module and formaldehyde detection equipment

Technical Field

The utility model relates to the technical field of environment monitoring equipment, in particular to a solid polymer sensor module and formaldehyde detection equipment.

Background

The sensors for detecting formaldehyde include optical sensors, photogenic sensors, electrochemical sensors, and the like. Among them, the optical sensor is expensive, large in size, not suitable for on-line real-time analysis, and limited in its use. Although the photobiological sensor improves selectivity, the sensor is unstable and lacks practicability due to the activity of enzyme and other factors, and the formaldehyde gas sensor is generally too expensive to be popularized. The traditional electrochemical sensor has the advantages of simple structure and low cost, wherein the performance of high-quality products is stable, and the measurement range and the resolution ratio basically meet the requirements of indoor environment detection. However, the conventional electrochemical sensor is susceptible to humidity, and the application of the conventional electrochemical sensor brings great challenges to instrument developers.

SUMMERY OF THE UTILITY MODEL

One of the technical problems to be solved by the utility model is how to reduce the influence of humidity on the detection effect of the electrochemical sensor and improve the stability of the electrochemical sensor.

In order to solve the above problems, the present invention provides a solid polymer sensor module, which includes an electrochemical sensor and a circuit board, wherein the electrochemical sensor includes an upper shell, a base and a chip, the upper shell and the base are covered to form a cavity, the chip is fixedly mounted in the cavity, the base is fixedly mounted with a plurality of pins, each pin has a first end and a second end opposite to each other, the first end is connected to the circuit board, the second end is connected to the chip in a contact manner, the chip is provided with a waterproof breathable film, and the waterproof breathable film is adapted to prevent moisture in a gas to be detected from entering a reaction medium on the chip.

Compared with the prior art, the solid polymer sensor module provided by the utility model has the advantages that the waterproof breathable film is arranged on the chip in the electrochemical sensor, and the gas to be measured enters the cavity enclosed by the upper shell and the base and then enters the chip through the guidance of the channel structure in the cavity. The gas to be detected is dispersed into the reaction medium on the chip through the waterproof breathable film, the gas to be detected and the reaction medium are subjected to chemical reaction to generate an electric signal and output the electric signal outwards through the pin needles, and the output signal is an original signal of the electrochemical sensor. The inventor finds that the traditional electrochemical sensor is susceptible to humidity, and mainly the moisture in the gas to be detected enters the reaction medium to influence the stability of the electric signal result formed by the reaction of the gas to be detected and the reaction medium. Therefore, the waterproof breathable film is arranged on the chip, so that the moisture in the gas to be detected which reacts with the reaction medium can be reduced, the influence of the humidity on the detection effect of the electrochemical sensor is reduced, and the stability of the electrochemical sensor is improved.

Optionally, a signal output device is arranged on the circuit board, and the signal output device is suitable for transmitting the signal detected by the electrochemical sensor to the outside.

Optionally, the signal output device includes a terminal block and a flat cable, the terminal block is fixedly mounted on the circuit board, and one end of the flat cable is plugged with the terminal block. The arrangement of the terminal seat and the flat cable facilitates the connection of the solid polymer sensor module with other electronic modules, and simplifies the assembly steps.

The second technical problem to be solved by the utility model is how to reduce the influence of humidity on the detection effect of the formaldehyde detection equipment and improve the detection stability of the formaldehyde detection equipment.

In order to solve the above problems, the present invention provides a formaldehyde detecting device including any one of the above solid polymer sensor modules.

Optionally, formaldehyde check out test set still includes the shell, sets up vacuum pump and setting in the shell are in display device on the shell, display device and circuit board signal connection, the circuit board with the inner wall of shell is connected and is enclosed and close and form the air chamber, the air chamber through first connecting pipe with air inlet switch-on the shell, the air chamber through the second connecting pipe with the inlet end switch-on of vacuum pump, the end of giving vent to anger of vacuum pump through the third connecting pipe with gas outlet switch-on the shell. The vacuum pump and the gas chamber are arranged and are suitable for pumping external gas into the environment of the gas chamber to be detected by the electrochemical sensor.

Optionally, the inner wall of the shell at the air inlet extends inwards to form a first interface, the air chamber is provided with a second interface, and two ends of the first connecting pipe are respectively connected with the first interface and the second interface pipeline. The arrangement of the first interface and the second interface facilitates the assembly of the first connecting pipe.

Optionally, a third interface is arranged on the air chamber, and two ends of the second connecting pipe are respectively connected with the second interface and the air inlet end pipeline of the vacuum pump. The third interface is arranged to facilitate the connection of the second connecting pipe and the air chamber.

Optionally, the inner wall of the shell at the air outlet extends inwards to form a fourth interface, and two ends of the third connecting pipe are respectively connected with the air outlet end of the vacuum pump and the fourth interface pipeline.

Optionally, the terminal block on the circuit board is in signal connection with the display device through a flat cable.

Drawings

FIG. 1 is a schematic structural diagram of an electrochemical sensor according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an electrochemical sensor according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a solid polymer sensor module according to an embodiment of the present invention;

FIG. 4 is a perspective view of a formaldehyde detecting apparatus in an embodiment of the present invention;

fig. 5 is a partial enlarged view of a portion a in fig. 4.

Description of reference numerals:

1. an electrochemical sensor; 2. a circuit board; 3. a signal output device; 4. a housing; 5. a vacuum pump; 6. a first connecting pipe; 7. a second connecting pipe; 8. a third connecting pipe; 9. a battery; 10. a display device;

100. an upper shell; 101. a base; 102. a pin; 103. a chip; 104. a waterproof breathable film;

102a, a first end; 102b, a second end;

31. a terminal block; 32. arranging wires;

401. a first interface; 402. a second interface; 403. a third interface; 404. a fourth interface; 405. an air chamber.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.

In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, 2 and 3, this embodiment provides a solid polymer sensor module, which includes an electrochemical sensor 1 and a circuit board 2, where the electrochemical sensor 1 includes an upper casing 100, a base 101 and a chip 103, the upper casing 100 and the base 101 cover a cavity, the chip 103 is fixedly mounted in the cavity, a plurality of pins 102 are fixedly mounted on the base 101, each pin 102 has a first end 102a and a second end 102b opposite to each other, the first end 102a is connected to the circuit board 2, the second end 102b is connected to the chip 103 in a contact manner, a waterproof gas-permeable membrane 104 is disposed on the chip 103, and the waterproof gas-permeable membrane 104 is adapted to prevent moisture in a gas to be detected from entering a reaction medium on the chip 103.

Further, as shown in fig. 1, in the present embodiment, the upper case 100 and the base 101 are welded by ultrasonic waves and then are closed to form a cavity. The upper end of the upper shell 100 is provided with a vent hole (not marked in the figure), the inner wall surface and the outer wall surface of the upper shell 100 are respectively provided with a filtering membrane, and the filtering membranes can filter particles and simultaneously condense part of water in the gas to be detected into water drops to be retained, so that the humidity of the gas to be detected entering the chip 103 is reduced.

Further, the chip 103 is an electrochemical detection chip 103 having a reaction medium adapted to react with a specific gas. In this embodiment, the reaction medium can react with formaldehyde, and when the gas to be measured contains formaldehyde, the formaldehyde reacts with the reaction medium chemically, so as to generate an electrical signal, and the electrical signal is output through the pin 102, and the output signal is an original signal of the electrochemical sensor 1.

Further, in the solid polymer sensor module of this embodiment, a waterproof gas-permeable membrane 104 is disposed on a chip 103 in the electrochemical sensor 1, and after entering a cavity enclosed by the upper case 100 and the base 101, a gas to be measured enters the chip 103 through the guidance of a channel structure inside the cavity. The inventor finds that the conventional electrochemical sensor 1 is susceptible to humidity, and mainly moisture in the gas to be measured enters the reaction medium, so that the stability of the result of the electric signal formed by the reaction of the gas to be measured and the reaction medium is affected. Therefore, in the present invention, the waterproof air-permeable film 104 is provided on the chip 103, so that the influence of humidity on the detection effect of the electrochemical sensor 1 can be obtained, and the stability of the electrochemical sensor 1 can be improved.

Further, in this embodiment, the waterproof breathable film 104 is adapted to prevent moisture in the gas to be detected from entering the reaction medium on the chip 103, specifically, the waterproof breathable film 104 is capable of preventing water drops or water drops from being immersed in the chip 103.

Specifically, as shown in fig. 3, the circuit board 2 is provided with a signal output device 3, and the signal output device 3 is adapted to transmit the signal detected by the electrochemical sensor 1 to the outside.

Further, a plurality of electronic components are integrated on the circuit board 2, and are adapted to amplify the current from the pins 102, and finally output the TTL signal of the UART communication protocol, and transmit the TTL signal to the outside through the signal output device 3.

Specifically, the signal output device 3 includes a terminal block 31 and a flat cable 32, the terminal block 31 is fixedly mounted on the circuit board 2, and one end of the flat cable 32 is plugged into the terminal block 31.

Further, the terminal block 31 and the flat cable 32 are arranged to facilitate connection of the solid polymer sensor module with other electronic modules, thereby simplifying the assembly process.

Furthermore, in the present embodiment, four pins are disposed on the flat cable 32, and four flat cables 32 are corresponding to the flat cable 32. Some of the flat cables 32 are adapted to transmit signals, and the other flat cables 32 are adapted to supply power to the circuit board 2.

In another embodiment, a formaldehyde detection device is provided that includes the solid state polymer sensor module of the above embodiments.

As shown in fig. 4, the formaldehyde detecting apparatus further includes a housing 4, a vacuum pump 5 disposed in the housing 4, and a display device 10 disposed on the housing 4, the display device 10 is in signal connection with the circuit board 2, the circuit board 2 is connected with an inner wall of the housing 4 and encloses to form an air chamber 405, the air chamber 405 is connected with an air inlet on the housing 4 through a first connecting pipe 6, the air chamber 405 is connected with an air inlet end of the vacuum pump 5 through a second connecting pipe 7, and an air outlet end of the vacuum pump 5 is connected with an air outlet on the housing 4 through a third connecting pipe 8. The vacuum pump 5 and the gas chamber 405 are arranged to pump external gas into the environment of the gas chamber 405 for detection by the electrochemical sensor 1.

Specifically, the terminal block 31 on the circuit board 2 is in signal connection with the display device 10 through the flat cable 32.

Further, the display device 10 is integrated with a signal acquisition and processing circuit module and a display screen, after acquiring the TTL signal, the signal acquisition and processing circuit module acquires and reprocesses the signal according to a given communication protocol, and presents the calculated formaldehyde gas concentration value in ppm or ppb unit and in arabic number form through the display screen.

Further, as shown in fig. 4, a battery 9 is installed inside the housing 4, and the battery 9 supplies power to the display device 10 and the circuit board 2, and the vacuum pump 5, respectively. The circuit connection structure of the battery 9, the display device 10, the circuit board 2 and the vacuum pump 5 is a common circuit structure in the conventional formaldehyde detection equipment, and the present embodiment is not adjusted and thus will not be described in detail.

Further, formaldehyde check out test set is hand-held type check out test set. The interior of the housing 4 has a cavity structure, and the inner wall of the housing 4 extends inwards to form the side wall of the air chamber 405. After the circuit board 2 is connected to the housing 4, the side walls are closed to form a closed air chamber 405. The gas cell 405 has a volume greater than the volume of the solid polymer sensor module. The formaldehyde gas rapidly diffuses after entering the gas chamber 405 through the first connecting tube 6, and a part of the gas enters the sensor through the waterproof gas-permeable membrane 104 of the sensor and reacts with the electrolyte. Meanwhile, as the vacuum pump 5 continuously operates, most of formaldehyde gas enters the air inlet end of the vacuum pump 5 through the second connecting pipe 7 and is exhausted out of the external space through the vacuum pump 5 and the third connecting pipe 8. During continuous air intake and exhaust processes, the gas in the air chamber 405 is continuously replaced to ensure that the formaldehyde gas contacting the solid polymer sensor is a real-time gas sample to be measured.

Specifically, as shown in fig. 4 and 5, the inner wall of the housing 4 at the air inlet extends inward to form a first interface 401, the air chamber 405 is provided with a second interface 402, and two ends of the first connecting pipe 6 are respectively connected to the first interface 401 and the second interface 402 through pipes. The provision of the first interface 401 and the second interface 402 facilitates the assembly of the first connecting tube 6.

Further, the first connection pipe 6 is connected to the first port 401 and the second port 402 in a socket connection manner. Compared with the scheme that the first connecting pipe 6 is formed along with the shell 4 in an integral injection molding mode in the prior art, the socket connection mode is convenient for assembling and replacing the first connecting pipe 6.

Specifically, as shown in fig. 5, a third port 403 is provided on the gas chamber 405, and two ends of the second connection pipe 7 are respectively connected to the second port 402 and the gas inlet pipe of the vacuum pump 5. The third interface 403 is provided to facilitate the connection of the second connection pipe 7 with the air chamber 405.

Specifically, the inner wall of the housing 4 at the air outlet extends inwards to form a fourth interface 404, and two ends of the third connecting pipe 8 are respectively connected with the air outlet end of the vacuum pump 5 and the fourth interface 404 through pipelines.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and such changes and modifications will fall within the scope of the present invention.

Claims

1. A solid state polymer sensor module comprising an electrochemical sensor (1) and a circuit board (2), characterized in that: the electrochemical sensor (1) comprises an upper shell (100), a base (101) and a chip (103), wherein the upper shell (100) and the base (101) are covered to form a cavity, the chip (103) is fixedly installed in the cavity, a plurality of pin pins (102) are fixedly installed on the base (101), each pin (102) is provided with a first end (102a) and a second end (102b) which are opposite to each other, the first end (102a) is connected with the circuit board (2), the second end (102b) is in contact connection with the chip (103), a waterproof breathable film (104) is arranged on the chip (103), and the waterproof breathable film (104) is suitable for preventing moisture in gas to be detected from entering a reaction medium on the chip (103).

2. The solid state polymer sensor module of claim 1, wherein: the circuit board (2) is provided with a signal output device (3), and the signal output device (3) is suitable for transmitting signals detected by the electrochemical sensor (1) outwards.

3. The solid state polymer sensor module of claim 2, wherein: the signal output device (3) comprises a terminal seat (31) and a flat cable (32), the terminal seat (31) is fixedly installed on the circuit board (2), and one end of the flat cable (32) is connected with the terminal seat (31) in an inserting mode.

4. The utility model provides a formaldehyde check out test set which characterized in that: comprising a solid polymer sensor module according to any one of claims 1 to 3.

5. The formaldehyde detecting apparatus of claim 4, wherein: still include shell (4), set up vacuum pump (5) in shell (4) and set up display device (10) on shell (4), display device (10) and circuit board (2) signal connection, circuit board (2) with the inner wall of shell (4) is connected and is enclosed and close formation air chamber (405), air chamber (405) through first connecting pipe (6) with air inlet switch-on shell (4), air chamber (405) through second connecting pipe (7) with the inlet end switch-on of vacuum pump (5), the end of giving vent to anger of vacuum pump (5) through third connecting pipe (8) with the gas outlet switch-on shell (4) is put through.

6. The formaldehyde detecting apparatus of claim 5, wherein: the inner wall of the shell (4) at the air inlet extends inwards to form a first interface (401), the air chamber (405) is provided with a second interface (402), and two ends of the first connecting pipe (6) are respectively connected with the first interface (401) and the second interface (402) through pipelines.

7. The formaldehyde detecting apparatus of claim 6, wherein: and a third interface (403) is arranged on the air chamber (405), and two ends of the second connecting pipe (7) are respectively connected with the second interface (402) and an air inlet end pipeline of the vacuum pump (5).

8. The formaldehyde detecting apparatus of claim 7, wherein: the inner wall of the shell (4) at the air outlet extends inwards to form a fourth interface (404), and two ends of the third connecting pipe (8) are respectively connected with the air outlet end of the vacuum pump (5) and the fourth interface (404) through pipelines.

9. The formaldehyde detecting apparatus of claim 5, wherein: and the terminal seat (31) on the circuit board (2) is in signal connection with the display device (10) through a flat cable (32).