CN211856442U

CN211856442U - Electrochemical gas sensor packaged by ultrasonic welding

Info

Publication number: CN211856442U
Application number: CN202020215098.3U
Authority: CN
Inventors: 杨双双; 马俊平; 张东旭
Original assignee: Nanjing Aut Eq Science & Technology Co ltd
Current assignee: Nanjing Aut Eq Science & Technology Co ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-11-03
Anticipated expiration: 2030-02-27

Abstract

The utility model discloses an electrochemical gas sensor using ultrasonic welding encapsulation, which relates to the technical field of electrochemical sensor application, comprising an upper cover and a lower shell, wherein the middle part of the upper cover is provided with an air inlet hole, the upper cover and the lower shell form a sensor shell and form a sealed cavity inside, a working electrode, a reference electrode, a counter electrode and a liquid absorption material are arranged in the cavity, a pin is extended from the bottom of the shell, a welding rib is convexly extended from the circumference of the outer side wall of the upper cover, the welding rib and the upper cover are integrally formed, the bottom of the upper cover is provided with an annular chamfer, the top opening of the lower shell is used for connecting the upper cover, the encapsulation and fusion welding are realized between the upper cover and the lower shell through the ultrasonic welding rib, the welding rib is then subjected to heat fusion due to ultrasonic vibration and friction, a welding surface is formed after fusion, and is bonded with the inner wall of the lower shell, the excessive melting material can enter the flash groove, so that the flash cannot flow to the outer side of the sensor after ultrasonic welding.

Description

Electrochemical gas sensor packaged by ultrasonic welding

Technical Field

The utility model relates to an electrochemical sensor uses technical field, concretely relates to use electrochemical gas sensor of ultrasonic bonding encapsulation.

Background

The electrochemical gas sensor is widely applied to gas detection device equipment due to the advantages of high sensitivity, small cross interference, small power, quick response time and the like, the typical electrochemical gas sensor comprises a working electrode, a reference electrode, a counter electrode, electrolyte, a diaphragm and the like, and an inner element is sealed by a shell comprising an upper cover and a lower shell with air inlet holes. Because the inside electrolyte that contains of electrochemistry gas sensor, so the shell needs to have airtight, watertight requirement, generally uses ultrasonic bonding's mode to combine together upper cover and lower casing and form the cavity, and this cavity is used for storing electrolyte to provide the place for the gas to be examined takes place electrochemical reaction.

The ultrasonic welding packaging has the advantages of short time, high efficiency, convenient operation and beautiful appearance, and the electrochemical gas sensor packaged by ultrasonic welding also has the defects of complex structure of welding parts, low welding strength and easy flash. Therefore, it is desirable to provide an electrochemical gas sensor using ultrasonic bonding for packaging.

Disclosure of Invention

In order to overcome the deficiencies in the prior art, the utility model discloses an use electrochemical gas sensor of ultrasonic bonding encapsulation, it is sealed effectual, can effectively solve the flash problem.

In order to realize the above-mentioned purpose, the utility model discloses an use electrochemistry gas sensor of ultrasonic bonding encapsulation, including upper cover and lower casing, the upper cover middle part sets up the inlet port, upper cover and casing constitution sensor housing down form sealed cavity in inside, set up working electrode in the cavity, reference electrode, counter electrode and imbibition material, the pin is stretched out to the bottom of shell, the protruding welding muscle of stretching of the lateral wall circumference of upper cover, welding muscle and upper cover integrated into one piece, the bottom of upper cover sets up annular chamfer, the open-top of lower casing is used for connecting the upper cover, the mode through ultrasonic bonding welding muscle between upper cover and the lower casing realizes the encapsulation butt fusion.

Preferably, the working electrode is arranged at the upper position of the inner cavity of the lower shell, and the working electrode is positioned right below the air inlet.

Preferably, the reference electrode is arranged in the middle of the inner cavity of the lower shell, and the first liquid absorbing material is arranged between the reference electrode and the working electrode.

Preferably, the counter electrode is arranged at the lower middle position of the inner cavity of the lower shell, and the second liquid absorbing material is arranged between the counter electrode and the reference electrode.

Preferably, the inner cavity of the lower shell is provided with an electrolyte tank by the bottom, electrolyte is filled in the electrolyte tank, a support plate is arranged at the top of the electrolyte tank, a third liquid absorbing material is arranged in the electrolyte tank, and the top of the third liquid absorbing material is connected with the support plate.

Preferably, the upper cover and the lower shell are both made of the same corrosion-resistant material.

The utility model discloses following beneficial effect has:

set up the welding muscle and set up the chamfer in the bottom of upper cover through the lateral wall at the upper cover to the welding muscle forms the face of weld after the melting because of ultrasonic vibration frictional heating then melts, and bonds with lower casing inner wall, realizes sealed butt fusion, has improved sealed effect, and the upper cover bottom sets up the round chamfer, forms the flash tank, and unnecessary material that melts can get into in the flash tank, so ultrasonic bonding back, can not flash to the sensor outside and influence the sensor outward appearance.

Drawings

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

Fig. 1 is a schematic view showing the overall structure of an electrochemical gas sensor packaged by ultrasonic welding.

Fig. 2 is a schematic view showing a disassembled structure of an upper cover and a lower case of an electrochemical gas sensor packaged by ultrasonic welding in fig. 1.

Reference numerals: 1. an upper cover; 2. a lower housing; 3. a working electrode; 4. a reference electrode; 5. a counter electrode; 6. a first liquid absorbent material; 7. a second liquid absorbent material; 8. a third liquid absorbent material; 9. a support plate; 10. an air inlet; 11. an electrolyte tank; 12. a pin; 13. welding ribs; 14. and (6) chamfering.

Detailed Description

The technical solution of the present invention will be more clearly and completely explained by the description of the preferred embodiments of the present invention with reference to the accompanying drawings.

Examples

As shown in figure 1-2, an electrochemical gas sensor packaged by ultrasonic welding comprises an upper cover 1 and a lower shell 2, wherein an air inlet 10 is arranged in the middle of the upper cover 1, the upper cover 1 and the lower shell 2 form a sensor shell and form a sealed cavity in the sensor shell, a working electrode 3, a reference electrode 4, a counter electrode 5 and a liquid absorption material are arranged in the cavity, pins 12 extend out of the bottom of the shell, a welding rib 13 protrudes from the circumference of the outer side wall of the upper cover 1, the welding rib 13 is integrally formed with the upper cover 1, an annular chamfer 14 is arranged at the bottom of the upper cover 1, the top opening of the lower shell 2 is used for connecting the upper cover 1, the sealing welding between the upper cover 1 and the lower shell 2 is realized by the ultrasonic welding rib 13, the electrochemical gas sensor shell is formed, and the sealed cavity is formed, and the shell has the functions of protecting various elements in the sensor and providing, Providing a field for electrochemical reaction of the sensor.

As a technical optimization scheme of the utility model, working electrode 3 sets up 2 inner chambers of casing under and leans on the upper position, and working electrode 3 is located inlet port 10 under.

By adopting the technical scheme, the working electrode 3 is an electrode of a system which is used for generating required electrochemical reaction or responding to an excitation signal and changing the concentration of the solution body in the measuring process.

As a technical optimization scheme of the utility model, reference electrode 4 sets up the intermediate position of 2 inner chambers of casing under, and sets up first liquid absorbing material 6 between reference electrode 4 and the working electrode 3.

By adopting the technical scheme, the reference electrode 4 is an electrode which is used for providing a standard potential and has a potential which does not change along with the change of the components and the concentration of a measurement system, the electrode has better reversibility, reproducibility and stability, and common reference electrodes 4 comprise SHE, Ag/AgCl and Hg/Hg2Cl2 electrodes, particularly SCE is used most.

As a technical optimization scheme of the utility model, counter electrode 5 sets up the position by the lower position in the centre of 2 inner chambers of casing down, sets up second imbibition material 7 between counter electrode 5 and reference electrode 4.

By adopting the technical scheme, the counter electrode 5 can form a current loop with the working electrode 3 as a place for electron transfer.

As a technical optimization scheme of the utility model, 2 inner chambers of lower casing lean on the bottom position to set up

electrolyte tank

11, 11 inside splendid attire electrolytes in electrolyte tank, and electrolyte tank 11's top sets up backup pad 9, and electrolyte tank 11's inside sets up

third imbibition material

8, and 8 top joint support boards 9 of third imbibition material.

By adopting the technical scheme, ions in the electrolyte play a role in transferring electrons to form a loop.

As a technical optimization scheme of the utility model, upper cover 1 all adopts corrosion resistant material of the same race to make with lower casing 2, and corrosion resistant material can be for ABS, PC, PE etc..

Through adopting above-mentioned technical scheme, can guarantee that upper cover 1 and lower casing 2 of the same material can have good corrosion-resistant effect, and guaranteed the butt fusion effect between upper cover 1 and the lower cover body.

The principle of the utility model is that, during the butt fusion, upper cover 1 sets up on the opening at 2 tops of casing down, and welding muscle 13 forms the face of weld because of ultrasonic vibration frictional heating then melts behind the melting to bond with 2 inner walls of casing down, realize sealed butt fusion, improved sealed effect, and upper cover 1 bottom sets up round chamfer 14, forms the flash tank, and unnecessary melt in the material can get into the flash tank, so ultrasonic bonding back, can not flash to the sensor outside and influence the sensor outward appearance.

The above detailed description merely describes the preferred embodiments of the present invention and does not limit the scope of the present invention. Without departing from the design concept and spirit scope of the present invention, the ordinary skilled in the art should belong to the protection scope of the present invention according to the present invention provides the text description and drawings to the various modifications, replacements and improvements made by the technical solution of the present invention. The scope of protection of the present invention is determined by the claims.

Claims

1. The utility model provides an use electrochemical gas sensor of ultrasonic bonding encapsulation, includes upper cover and lower casing, the upper cover middle part sets up the inlet port, upper cover and lower casing constitute the sensor housing and form sealed cavity in inside, set up working electrode, reference electrode, counter electrode and imbibition material in the cavity, the pin is stretched out to the bottom of shell, its characterized in that: the protruding welding muscle of stretching of lateral wall circumference of upper cover, welding muscle and upper cover integrated into one piece, the bottom of upper cover sets up annular chamfer, the open-top of casing is used for connecting the upper cover down, realize the encapsulation butt fusion through the mode of ultrasonic bonding welding muscle between upper cover and the lower casing.

2. An electrochemical gas sensor packaged using ultrasonic welding according to claim 1, wherein: the working electrode is arranged at the upper position of the inner cavity of the lower shell, and the working electrode is positioned right below the air inlet.

3. An electrochemical gas sensor packaged using ultrasonic welding according to claim 1, wherein: the reference electrode is arranged in the middle of the inner cavity of the lower shell, and a first liquid absorption material is arranged between the reference electrode and the working electrode.

4. An electrochemical gas sensor packaged using ultrasonic welding according to claim 1, wherein: the counter electrode is arranged at the lower middle position of the inner cavity of the lower shell, and a second liquid absorption material is arranged between the counter electrode and the reference electrode.

5. An electrochemical gas sensor packaged using ultrasonic welding according to claim 1, wherein: the inner cavity of the lower shell is provided with an electrolyte tank near the bottom, electrolyte is contained in the electrolyte tank, a supporting plate is arranged at the top of the electrolyte tank, a third liquid absorbing material is arranged in the electrolyte tank, and the top of the third liquid absorbing material is connected with the supporting plate.

6. An electrochemical gas sensor packaged using ultrasonic welding according to claim 1, wherein: the upper cover and the lower shell are both made of the same corrosion-resistant material.