CN216696151U

CN216696151U - Gas sensor and intelligent equipment

Info

Publication number: CN216696151U
Application number: CN202022902036.2U
Authority: CN
Inventors: 张传浩
Original assignee: Shenzhen Everbest Machinery Industry Co ltd
Current assignee: Shenzhen Everbest Machinery Industry Co ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2022-06-07
Anticipated expiration: 2030-12-04

Abstract

The application provides a gas sensor and smart machine, gas sensor include circuit board subassembly, locate casing on the circuit board subassembly and locating the top cap at casing top, the casing has the holding chamber, the holding intracavity be equipped with the gaseous detection module that the circuit board subassembly electricity is connected, the top cap with form between the casing with the wind channel of gaseous detection module and outside intercommunication. This application, with gaseous detection module integration in the holding intracavity, set up the wind channel at holding chamber top simultaneously, because wind channel and gaseous detection module and outside intercommunication, gas can in time distribute away by the wind channel after detecting, under the circumstances with gas sensor volume reduction, still can guarantee the accuracy that detects next time.

Description

Gas sensor and intelligent equipment

Technical Field

The application belongs to the technical field of intelligent equipment, and more specifically relates to a gas sensor and intelligent equipment.

Background

The alcohol sensor is a testing tool for detecting the alcohol content of the gas exhaled by the human body, is also a detecting tool for detecting whether or how much a driver drinks when a traffic police is used for law enforcement, can effectively avoid traffic accidents, and can be applied to some high-risk fields or fields where post-drinking is forbidden.

The existing gas sensor is large in manufacturing volume and limited in application in order to meet the requirements of signals, and is generally only applied to a professional alcohol detector.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide a gas sensor and smart machine, solved among the prior art gas sensor when too little, detect inaccurate technical problem.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the utility model provides a gas sensor, includes circuit board assembly, locates casing on the circuit board assembly and locating the top cap at casing top, the casing has the holding chamber, the holding intracavity be equipped with the gaseous detection module that the circuit board assembly electricity is connected, the top cap with form between the casing with the wind channel of gaseous detection module and outside intercommunication.

Furthermore, the top cover comprises a support piece arranged at the top of the shell and a top plate arranged at the top of the support piece, the support piece is provided with an air inlet and an air outlet which are communicated with each other, the air channel is formed between the air inlet and the air outlet, and the accommodating cavity is positioned in the path of the air channel.

Furthermore, the supporting pieces are multiple, and the air inlets or the air outlets are formed between every two adjacent supporting pieces in a hollow-out design.

Further, the gas detection module comprises a first solid electrolyte membrane arranged in the accommodating cavity, a first catalyst wire arranged on the top surface of the first solid electrolyte membrane and electrically connected with the circuit board assembly, and a second catalyst wire arranged on the bottom surface of the first solid electrolyte membrane and electrically connected with the circuit board assembly.

Furthermore, a membrane pressing plate is further arranged at the bottom of the accommodating cavity and fixes the first solid electrolyte membrane, the first catalyst wire and the second catalyst wire in the accommodating cavity, and the membrane pressing plate is fixed in the accommodating cavity through sealant.

Furthermore, a second solid electrolyte membrane is further arranged in the accommodating cavity and at the bottom of the first solid electrolyte membrane, and the second catalyst wire is located between the second solid electrolyte membrane and the first solid electrolyte membrane.

Furthermore, the first catalyst wire comprises a horizontal first reaction part and a first connecting part bent downwards along the first reaction part, the first reaction part is attached to the top surface of the first solid electrolyte membrane, and the first connecting part extends out along the side surface of the first solid electrolyte membrane and is electrically connected with the circuit board assembly; the second catalyst wire comprises a horizontal second reaction part and a second connecting part bent downwards along the second reaction part, the second reaction part is attached to the top surface of the second solid electrolyte membrane, and the second connecting part extends out along the side surface of the second solid electrolyte membrane and is electrically connected with the circuit board assembly.

Furthermore, the first catalyst wire further comprises a first fixing part bent downwards along the end part of the first reaction part, and the first fixing part is attached to the side surface of the first solid electrolyte membrane and opposite to the first connecting part; the second catalyst wire further comprises a second fixing part bent downwards along the end part of the second reaction part, and the second fixing part is attached to the side face of the second solid electrolyte membrane and opposite to the second connecting part.

Further, the holding chamber is provided with a top opening, the top opening is a sunken step hole formed in the top surface of the shell, the breathable film is arranged on the step surface of the sunken step hole, and the cross section of the sunken step hole is square.

Further, the length range of the shell is 4.5 mm-6.0 mm; the width range is 4.5 mm-6.0 mm; the height range is 2.5 mm-6.0 mm.

The application also provides intelligent equipment, which comprises a main body, wherein the gas sensor is arranged in the main body.

The application provides a gas sensor beneficial effect lies in: compared with the prior art, this application is integrated in the holding intracavity with gaseous detection module, sets up the wind channel simultaneously at holding chamber top, because wind channel and gaseous detection module and outside intercommunication, gaseous can in time distribute away by the wind channel after detecting, under the circumstances with gas sensor volume reduction, still can guarantee the accuracy that detects next time.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments or the prior art description will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic perspective view of a gas sensor provided in an embodiment of the present application;

FIG. 2 is a top view of a gas sensor provided in an embodiment of the present application;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is a cross-sectional view of a housing in a gas sensor according to an embodiment of the present disclosure;

FIG. 6 is an exploded view of a gas sensor according to an embodiment of the present application;

wherein, in the figures, the respective reference numerals:

10-a circuit board assembly; 11-a circuit substrate; 12-welding holes; 40-a first solid state electrolyte membrane; 30-a housing; 31-an accommodating cavity; 311-bottom chamber; 312-top opening; 313-channel; 32-a top cover; 321-a support member; 322-a top plate; 323-gas inlet; 324-an air outlet; 33-an air duct; 20-a second solid electrolyte membrane; 60-first catalyst filaments; 61-a first reaction section; 62-a first connection; 63-a first fixed part; 50-second catalyst filaments; 51-a second reaction section; 52-a second connection; 53-a second fixed part; 511-the middle of the second reaction part; 512-both ends of the second reaction part; 70-a gas permeable membrane; 80-a diaphragm pressing plate; 82-a first limit groove; 81-second limiting groove.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 6 together, a gas sensor according to an embodiment of the present application will be described.

The gas sensor in the present application may be an alcohol sensor for detecting alcohol, and of course, other gases, such as formaldehyde, may also be detected.

The gas sensor provided in this embodiment has a small square shape as a whole. The gas detection device comprises a circuit board assembly 10, a shell 30 arranged on the circuit board assembly 10 and a top cover 32 arranged at the top of the shell 30, wherein the shell 30 is provided with a containing cavity 31, a gas detection module is arranged in the containing cavity 31 and is electrically connected with the circuit board assembly, and an air channel 33 communicated with the gas detection module and the outside is formed between the top cover 32 and the shell 30.

In this embodiment, integrate gaseous detection module in holding chamber 31, set up wind channel 33 simultaneously at holding chamber 31 top, because wind channel 33 and gaseous detection module and outside intercommunication, gaseous can in time distribute away by wind channel 33 after detecting, under the circumstances with gas sensor volume reduction, still can guarantee the accuracy that detects next time.

Referring to fig. 1, 3 and 4, the top cover 32 includes a support 321 disposed on the top of the housing 30 and a top plate 322 disposed on the top of the support 321, the support 321 is provided with an air inlet 323 and an air outlet 324 communicated with each other, an air duct 33 is formed between the air inlet 323 and the air outlet 324, and the accommodating chamber 31 is located in a path of the air duct 33.

Referring to fig. 6, in the embodiment, four supporting members 321 are disposed at four corners of the top surface of the housing 30, and the air inlet or the air outlet is formed between two adjacent supporting members 321 by a hollow design. That is, in this embodiment, there are four fretworks, and four fretworks can be arbitrary air inlet or gas outlet. Of course, the supporting member 321 may have other structures, for example, the supporting member 321 may be two supporting plates disposed oppositely, the top plate 322 is set up on the supporting plates, and two ends of the two supporting plates may form two openings, i.e. the air inlet and the air outlet.

Since the top plate 322 is located right above the housing 30 and the accommodating chamber 31 is located at the center of the housing 30, the accommodating chamber 31 can communicate with the air duct 33. The gas detection module comprises a first solid electrolyte membrane 40 arranged in the accommodating cavity 31, a first catalyst wire 60 arranged on the top surface of the first solid electrolyte membrane 40 and electrically connected with the circuit board assembly 10, and a second catalyst wire 50 arranged on the bottom surface of the first solid electrolyte membrane 40 and electrically connected with the circuit board assembly 10.

In this embodiment, the gas test components such as the first solid electrolyte membrane 40, the first catalyst wire 50, the second catalyst wire 60, and the gas permeable membrane 70 are disposed in the compact case 30, so that the internal structure of the gas sensor is more compact, and the circuit board assembly 10 can be used as a part of the bottom case while achieving electrical connection, thereby reducing the height of the entire sensor, achieving better lightness and thinness, achieving higher integration level, and being better applicable to various intelligent devices.

In this embodiment, the first solid electrolyte membrane 40 has a substantially square cross-section, and may have a size of 4mm by 4 mm. Of course, the size of the solid electrolyte membrane may also be adjusted according to the required size of the gas sensor as a whole. The solid electrolyte membrane is used as a proton exchange membrane and has good chemical resistance and mechanical property, so that the thickness of the solid electrolyte membrane can be very thin, free movement of ions can be ensured during reaction, acidity is achieved, and the effect of reaction with alcohol in air can be achieved.

Further, in the present embodiment, a second solid electrolyte membrane 20 is further disposed in the accommodating cavity 31 and at the bottom of the first solid electrolyte membrane 40, and the second catalyst wire 50 is located between the second solid electrolyte membrane 20 and the first solid electrolyte membrane 40. By arranging the two solid electrolyte membranes, the reaction effect of gas, the membranes and the catalyst wires is improved.

The first catalytic wires 60 and the second catalytic wires 50 have substantially the same structure, and the structure may be various. Such as first catalytic wires 60 and second catalytic wires 50, may have an inverted L-shape. The first catalyst wire 60 includes a horizontal first reaction portion 61 and a first connection portion 62 bent downward along the first reaction portion 61, the first reaction portion 61 is attached to the top surface of the first solid electrolyte membrane 40, and the first connection portion 62 extends out along the side surface of the first solid electrolyte membrane 40 to be electrically connected with the circuit board assembly 10; the second catalytic wire 50 includes a horizontal second reaction portion 51 and a second connection portion 52 bent downward along the second reaction portion 51, the second reaction portion 51 is attached to the bottom surface of the first solid electrolyte membrane 40 and located on the top surface of the second solid electrolyte membrane 20, and the second connection portion 52 extends from the side surface of the second solid electrolyte membrane 20 to be electrically connected to the circuit board assembly 10. During detection, gas enters from the top of the accommodating cavity 31 to chemically react with the first solid electrolyte membrane 40 and the second solid electrolyte membrane 20 to generate sufficient charges, and the first catalyst wire 60 and the second catalyst wire 50 as conductive electrodes extend out to be electrically connected with the circuit board assembly 10, so that signal transmission is realized.

When the catalyst is installed, the two catalyst wires and the two solid electrolyte membranes are mutually pressed and arranged. In order to fix the two catalyst wires more firmly, the two catalyst wires are prevented from falling off. In this example, the two catalysts have the structure shown in fig. 6.

The first catalyst wire 60 further includes a first fixing portion 53 bent downward along an end portion of the first reaction portion 61, the first fixing portion 53 being attached to a side surface of the first solid electrolyte membrane 40 and opposing the first connection portion 62; the second catalytic wire 50 further includes a second fixing portion 63 bent downward along an end of the second reaction portion 51, and the second fixing portion 63 is attached to a side surface of the second solid electrolyte membrane 20 and is opposite to the second connecting portion 52. Thus, when mounted, the first fixing portion 53 of the first catalyst wire 60 is hooked to one side surface of the first solid electrolyte membrane sheet 40, and the first connecting portion 62 is protruded from the other side surface of the first solid electrolyte membrane sheet 40 opposite thereto; similarly, the second fixing portion 63 of the second catalytic wire 50 is hooked on one side surface of the second solid electrolyte membrane 20, and the second connecting portion 52 extends from the other side surface of the second solid electrolyte membrane 20 opposite to the first side surface. With this configuration, the first catalytic wires 60 and the second catalytic wires 50 are more firmly attached and are less likely to fall off.

Although the first catalytic wires 60 and the second catalytic wires 50 are not in direct contact, in this embodiment, the first catalytic wires 60 and the second catalytic wires 50 are spatially arranged in a crossed manner, that is, the first reaction part 61 and the second reaction part 51 of the reaction part are arranged in a cross shape, so that the first connection part 62 and the second connection part 52 can extend from different sides of the solid electrolyte membrane, and the first connection part and the second connection part are prevented from contacting with each other when extending from the same side to cause short circuit. Of course, the first catalytic wires 60 and the second catalytic wires 50 may be arranged in other manners, such as parallel or non-parallel manners. As long as the connecting parts of the two catalyst wires are not contacted with each other.

In order to better fix the two solid electrolyte membranes and the two catalyst wires in the accommodating cavity 31, in this embodiment, a membrane pressing plate 80 is further disposed in the accommodating cavity 31 and at the bottom of the first solid electrolyte membrane 40. When the catalyst is installed, the shell 30 is inverted, the second catalyst wire 50, the second solid electrolyte membrane 20, the first catalyst wire 60 and the first solid electrolyte membrane 40 are sequentially arranged in the shell, then the second catalyst wire, the second solid electrolyte membrane, the first catalyst wire and the first solid electrolyte membrane are tightly pressed by the membrane pressing plate 80, and finally the shell is sealed and fixed by sealing glue. Of course, when only one solid electrolyte membrane sheet is used, the membrane pressing plate 80 may be used for sealing and fixing.

In this embodiment, since the membrane pressing plate 80 is disposed at the bottom, in order to make the first catalyst wire 60 and the second catalyst wire 50 extend out and electrically connect with the circuit board assembly 10 better, the sidewall of the membrane pressing plate 80 is respectively disposed with the first limiting groove 82 and the second limiting groove 81, the first connecting portion 62 of the first catalyst wire 60 extends out downwards along the first limiting groove 82 to electrically connect with the circuit board assembly 10, and the second connecting portion 52 of the second catalyst wire 50 extends out downwards along the second limiting groove 81 to electrically connect with the circuit board assembly 10.

As shown in fig. 5, in the present embodiment, the accommodating cavity 31 is vertically through and can be divided into three parts according to the size of the through hole, namely, a bottom cavity 311, a top opening 312 and a channel 313 communicating the bottom cavity 311 and the top opening 312. The membrane pressing plate 80, the first solid electrolyte membrane 40 and the second solid electrolyte membrane 20 are sequentially arranged in the bottom cavity 311, and the channel 313 between the bottom cavity 311 and the top opening 312 is filled with air, so that the first solid electrolyte membrane 40, the second solid electrolyte membrane 20 and the breathable membrane 70 can be fully contacted with the gas, sufficient current is formed, and the accuracy of the test is ensured. In the above configuration, the middle portion 511 of the second reaction portion 51 of the second catalytic wire 50 faces the passage 313, and the ceiling wall of the bottom chamber 311 is pressed against both end portions 512 of the second reaction portion 51. In this way, on the one hand, the second reaction part 51 of the second catalytic wires 50 can be sufficiently contacted with the air in the channel 313 and the top opening 312, and on the other hand, the top wall of the bottom chamber 311 exerts a certain pressing action on both end parts 512 of the second reaction part 51, so that the second catalytic wires 50 and the second solid electrolyte membrane 20 can be better fixed.

In this embodiment, the top opening 312 is a sunken stepped hole formed in the top surface of the housing 30, a gas permeable membrane 70 is disposed on the stepped surface of the sunken stepped hole, and external gas can pass through the gas permeable membrane 70 to react with the first solid electrolyte membrane 20, the first catalyst filament 60 and the second catalyst filament 50. The gas permeable membrane 70 can filter water vapor and dust in the gas, but has good gas permeability, so that the clean gas can pass through the gas permeable membrane to ensure more accurate detection. Of course, the air permeable film 70 may be omitted from the alcohol sensor in this embodiment, and when the alcohol sensor is applied to various devices or apparatuses, the air permeable film 70 may be provided on the devices or apparatuses, and may also function as a waterproof, dustproof, and air permeable film. The cross section of the sunken stepped bore is square, and the cross sections of the channel 313 and the bottom chamber 311 communicated with the sunken stepped bore are also square. The square top opening is adopted, the air inlet can be maximized in a limited area, and therefore the sufficient air inflow can be effectively guaranteed, so that the micro gas sensor cannot have smaller signals than a traditional gas sensor, and the square accommodating cavity 31 is large in size, and chemical reaction of alcohol, two catalyst wires and two solid electrolyte membranes is facilitated.

Further, in the present embodiment, a heating device (not shown) is further disposed in the accommodating chamber 31. Heating device specifically can be the heating plate, through heating holding chamber 31 after the test, makes the gas that has the alcohol can volatilize fast, and no gas residue in the holding chamber 31 also carries out the zero clearing with alcohol in the holding chamber 31, guarantees the accuracy of next test.

In this embodiment, the first catalytic wires 60 and the second catalytic wires 50 are made of a noble metal. Specifically, the noble metal may be a platinum wire, but of course, other noble metals may be used to form the catalyst wire.

In this embodiment, the circuit board assembly 10 includes a circuit substrate 11 and components (not shown) disposed on the circuit substrate. Two welding holes 12 are formed in the circuit substrate 11, and the first catalytic wire 60 and the second catalytic wire 50 are welded to the two welding holes 12 after extending out of the first limiting groove 82 and the second limiting groove 81.

In the gas sensor provided by the embodiment, the length range of the sensor housing 30 is 4.5mm to 6.0 mm; the width range is 4.5 mm-6.0 mm; and the overall height range of the shell 30 after the top cover 32 is arranged is 2.5 mm-6.0 mm, and the preferred size is 5.5mm 4.8 mm.

The application also provides an intelligent device (not shown in the figure), which comprises a main body, wherein the gas sensor is arranged in the main body. Because gas sensor is small, and the test is accurate, but wide application in cell-phone, perhaps daily wearing equipment such as bracelet, wrist-watch, glasses. When gas sensor was applied to this kind of daily smart machine, can carry out the test after drinking wine to oneself very conveniently after the user drinks, see whether can pass through the alcohol test, if can not pass through, then the suggestion user can not drive or engage in dangerous work, moreover, because be provided with wind channel 33 on the alcohol sensor, gaseous can in time distribute away by wind channel 33 after detecting, under the condition with alcohol sensor volume reduction, still can guarantee the accuracy that detects next time.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A gas sensor, characterized by: including circuit board assembly, locate casing on the circuit board assembly and locating the top cap at casing top, the casing has the holding chamber, the holding intracavity be equipped with the gaseous detection module that the circuit board assembly electricity is connected, the top cap with form between the casing with the wind channel of gaseous detection module and outside intercommunication.

2. The gas sensor of claim 1, wherein: the top cover comprises a support piece arranged at the top of the shell and a top plate arranged at the top of the support piece, the support piece is provided with an air inlet and an air outlet which are communicated with each other, the air inlet and the air outlet form the air duct, and the accommodating cavity is positioned in the path of the air duct.

3. The gas sensor of claim 2, wherein: the support pieces are multiple, and the air inlets or the air outlets are formed between every two adjacent support pieces in a hollow-out design.

4. A gas sensor according to any one of claims 1 to 3, wherein: the gas detection module comprises a first solid electrolyte membrane arranged in the accommodating cavity, a first catalyst wire arranged on the top surface of the first solid electrolyte membrane and electrically connected with the circuit board assembly, and a second catalyst wire arranged on the bottom surface of the first solid electrolyte membrane and electrically connected with the circuit board assembly.

5. The gas sensor of claim 4, wherein: the bottom of the accommodating cavity is further provided with a membrane pressing plate, the first solid electrolyte membrane, the first catalyst wire and the second catalyst wire are fixed in the accommodating cavity through the membrane pressing plate, and the membrane pressing plate is fixed in the accommodating cavity through sealant.

6. The gas sensor of claim 4, wherein: and a second solid electrolyte membrane is further arranged in the accommodating cavity and at the bottom of the first solid electrolyte membrane, and the second catalyst wire is positioned between the second solid electrolyte membrane and the first solid electrolyte membrane.

7. The gas sensor of claim 6, wherein: the first catalyst wire comprises a horizontal first reaction part and a first connecting part bent downwards along the first reaction part, the first reaction part is attached to the top surface of the first solid electrolyte membrane, and the first connecting part extends out along the side surface of the first solid electrolyte membrane and is electrically connected with the circuit board assembly; the second catalyst wire comprises a horizontal second reaction part and a second connecting part bent downwards along the second reaction part, the second reaction part is attached to the top surface of the second solid electrolyte membrane, and the second connecting part extends out along the side surface of the second solid electrolyte membrane and is electrically connected with the circuit board assembly.

8. The gas sensor of claim 7, wherein: the first catalyst wire also comprises a first fixing part bent downwards along the end part of the first reaction part, and the first fixing part is attached to the side surface of the first solid electrolyte membrane and is opposite to the first connecting part; the second catalyst wire further comprises a second fixing part bent downwards along the end part of the second reaction part, and the second fixing part is attached to the side face of the second solid electrolyte membrane and opposite to the second connecting part.

9. The gas sensor of claim 4, wherein: the accommodating cavity is provided with a top opening, the top opening is a sunken step hole formed in the top surface of the shell, the breathable film is arranged on the step surface of the sunken step hole, and the cross section of the sunken step hole is square.

10. The gas sensor of claim 1, wherein: the length range of the shell is 4.5 mm-6.0 mm; the width range is 4.5 mm-6.0 mm; the height range is 2.5 mm-6.0 mm.

11. An intelligent device, comprising a main body, characterized in that: a gas sensor as claimed in any one of claims 1 to 10 is provided within the body.