Electrochemical alcohol sensor

Abstract

The utility model discloses an electrochemical alcohol sensor, which solves the technical problems of low detection precision and poor reliability of the existing alcohol sensor. The sensor comprises a tube seat with a gas chamber, a plurality of guide plates are sequentially arranged in the gas chamber along a gas flowing path, and an electrode connected with a circuit board is arranged in the gas chamber. The guide plate enables gas to flow more smoothly, gas is prevented from remaining in the gas chamber and affecting next detection, meanwhile, the flow path is lengthened, the reaction time of gas and the electrode is prolonged, and the detection accuracy is improved; the wear-resistant layer is arranged on the inner wall of the gas chamber to increase the friction force of a gas path, reduce the gas flow rate and impact force, reduce the loss of electrolyte on the electrode and prolong the service life of the sensor; the lead is sealed and fixed on the tube seat by glue, so that external gas and liquid are prevented from entering the sensor, the lead is prevented from being disconnected due to vibration, and the anti-seismic performance is improved; the whole structure is simple, the size is small, installation and maintenance are convenient, and miniaturization of the alcohol detector is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of alcohol detectors, in particular to an electrochemical alcohol sensor. Background Art

[0002] An alcohol detector is used to detect the alcohol content in the exhaled gas of the human body. In the field of traffic safety, it is used to assist traffic police in checking for drunk driving, which can effectively reduce traffic accidents. At the same time, in some special occupational fields, employees are required to maintain a good physical condition and cannot go to work after drinking. The alcohol detector is used to ensure the safety of the workplace and reduce the occurrence of safety accidents. As the core component of the alcohol detector, the performance of the alcohol sensor is crucial.

[0003] At present, the most widely used combination in alcohol detectors on the market is an electrochemical alcohol sensor and an air pump. The alcohol detector includes a main air pipe for the detector to blow air. An electrochemical alcohol sensor is connected to the main air pipe. The electrochemical alcohol sensor is provided with an air chamber for gas to flow through and an electrical signal detection module. The outlet of the air chamber is connected to the air pump through a connecting pipe. The electrochemical alcohol sensor uses the electrolyte to react with the alcohol in the exhaled breath to generate chemical energy. The chemical energy is then converted into an electric current after energy conversion. Then, according to the fact that the magnitude of the current is proportional to the alcohol concentration and follows Faraday's law, the main board of the alcohol detector can determine the level of alcohol concentration by measuring the magnitude of the current.

[0004] During the use process, the person being detected often exhales a large amount of high-speed gas. When the pressure reaches the set value, the air pump quickly sucks the gas in the main air pipe into the electrochemical alcohol sensor through the connecting pipe for detection. This kind of detection has many disadvantages. On the one hand, due to the extremely fast air extraction action and the too high flow rate of the measured gas, the reaction between the gas and the electrolyte is incomplete, reducing the accuracy of the electrochemical alcohol sensor. The high-speed gas will also accelerate the loss of the electrolyte, reducing the service life of the electrochemical alcohol sensor. Moreover, an unreasonable gas path design will cause the detection gas to stay in the electrochemical alcohol sensor, interfering with the next detection. On the other hand, when the operator uses the alcohol detector, he will constantly shake it, which is likely to cause the electrochemical alcohol sensor to vibrate, and then lead to the disconnection of the connection between the alcohol content detection module and the air chamber, ultimately resulting in the failure of the alcohol detector. Summary of the Utility Model

[0005] In view of the above deficiencies in the background art, the present utility model proposes a new type of electrochemical alcohol sensor, which solves the technical problems of low detection accuracy and poor reliability of the existing alcohol sensor.

[0006] The technical solution of this application is as follows:

[0007] An electrochemical alcohol sensor includes a pipe seat with an air chamber. A plurality of flow guiding plates are sequentially arranged in the air chamber along the gas flow path. An electrode connected to a circuit board is arranged in the air chamber.

[0008] The electrochemical alcohol sensor provided by this technical solution is connected between the main air pipe and the connecting pipe. After the gas enters the electrochemical alcohol sensor from the main air pipe, the gas chamber provides a stable environment for the internal gas reaction. The flow guide plate can guide the gas entering the gas chamber, making the gas flow more smoothly, avoiding gas residue, and improving the reliability of the electrochemical alcohol sensor; and the gas flows through each flow guide plate, extending the gas path, increasing the reaction time between the gas and the electrode, and improving the accuracy of the electrochemical alcohol sensor.

[0009] Preferably, a first flow guide plate is provided at the inlet of the gas chamber, and a second flow guide plate is provided at the outlet. The first flow guide plate and the second flow guide plate construct an S-shaped gas path in the gas chamber. After the gas enters the gas chamber from the inlet, it flows through the first flow guide plate and the second flow guide plate in sequence, forming an S-shaped path.

[0010] Preferably, the inner peripheral wall of the gas chamber is quadrilateral and includes a first boundary, a second boundary, a third boundary, and a fourth boundary. The first flow guide plate is inclinedly connected to the first boundary, the second flow guide plate is inclinedly connected to the third boundary, the inlet is located between the included angle of the first boundary and the first flow guide plate, and the outlet is located between the included angle of the third boundary and the second flow guide plate. The first flow guide plate and the second flow guide plate can be parallel, the included angle between the first boundary and the first flow guide plate is an acute angle, and the included angle between the third boundary and the second flow guide plate is an acute angle.

[0011] Preferably, the included angle between the first flow guide plate and the first boundary is A1, 10° ≤ A1 ≤ 70°, and the included angle between the second flow guide plate and the third boundary is A2, 10° ≤ A2 ≤ 70°. The included angle between the first flow guide plate and the first boundary and the included angle between the second flow guide plate and the third boundary should enable the gas to pass smoothly and increase a certain gas flow path.

[0012] Preferably, the distance between the second boundary and the fourth boundary is L1, the distance between the first flow guide plate and the second boundary is b1, 0.2L1 ≤ b1 ≤ 0.5L1, the distance between the second flow guide plate and the fourth boundary is b2, 0.2L1 ≤ b2 ≤ 0.5L1, and the distance between the first flow guide plate and the second flow guide plate is C, 0.2L1 ≤ C ≤ 0.8L1.

[0013] Preferably, the pipe seat is provided with an air inlet and an air outlet communicating with both ends of the gas chamber. The diameter of the air inlet is X1, 0.3 ≤ X1 ≤ 3, and the diameter of the air outlet is X2, 0.3 ≤ X2 ≤ 3.

[0014] Preferably, a wear-resistant layer is provided on the inner wall of the gas chamber. The side wall of the gas chamber is specially treated, increasing the friction force of the gas in the gas path, reducing the flow rate and impact force of the gas in the gas path, weakening the loss of the electrolyte on the electrode, and improving the service life of the electrochemical alcohol sensor.

[0015] Preferably, the electrode is connected to the circuit board through lead 1 and lead 2, and lead 1 and lead 2 are respectively bonded to the socket. Lead 1 and lead 2 are sealed and fixed with glue. The glue prevents external gases and liquids from entering the internal part of the electrochemical alcohol sensor. At the same time, the glue completely wraps lead 1 and lead 2, playing a protective role for lead 1 and lead 2, avoiding the breakage of lead 1 or lead 2 caused by vibration of the electrochemical alcohol sensor, and improving the anti-vibration performance of the electrochemical alcohol sensor.

[0016] Preferably, the circuit board is fixedly connected to the bottom of the socket, and a cover plate is hermetically connected to the top of the socket. The electrode is arranged between the gas chamber and the cover plate. The circuit board can be fixed to the bottom of the socket by hot melting or buckling, and the cover plate is fixed to the top of the socket by means of glue bonding, hot melting, screws, ultrasonic waves, etc., forming a sealed gas chamber, providing a stable environment for the gas reaction inside the gas chamber.

[0017] Preferably, a gasket is arranged between the electrode and the cover plate. On the one hand, the gasket is used to separate the electrode and the cover plate, and on the other hand, it can increase the connection tightness between the cover plate and the socket.

[0018] Compared with the prior art, the technical solution disclosed by the utility model has the following beneficial effects:

[0019] 1. By arranging the flow guide plate to form an S-shaped gas path in the gas chamber, the gas flow is made smoother, avoiding the gas remaining in the gas chamber and affecting the next detection. At the same time, the gas flow path is increased, the reaction time between the gas and the electrolyte is increased, and the accuracy of the electrochemical alcohol sensor is improved.

[0020] 2. By adding a wear-resistant layer to the inner wall of the gas chamber, the friction force of the gas in the flow channel is increased, the flow rate and impact force of the gas in the gas path are reduced, the loss of the electrolyte on the electrode is reduced, and the service life of the electrochemical alcohol sensor is improved.

[0021] 3. By sealing and fixing lead 1 and lead 2 on the socket with glue, the glue prevents external gases and liquids from entering the internal part of the electrochemical alcohol sensor. At the same time, the glue completely wraps lead 1 and lead 2, playing a protective role for lead 1 and lead 2, avoiding the disconnection caused by vibration of the electrochemical alcohol sensor, and improving the anti-vibration performance of the electrochemical alcohol sensor.

[0022] 4. The overall structure of the utility model is simple, small in size, convenient for installation and maintenance, and is conducive to the miniaturization of the alcohol detector. Description of the Drawings

[0023] To more clearly illustrate the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 is a schematic structural diagram of an existing alcohol detector.

[0025] Figure 2 is a perspective view of the electrochemical alcohol sensor of the present utility model.

[0026] Figure 3 is an exploded view of the electrochemical alcohol sensor of the present utility model.

[0027] Figure 4 is a schematic diagram of lead fixation of the electrochemical alcohol sensor of the present utility model.

[0028] Figure 5 is a schematic diagram of the gas flow direction of the electrochemical alcohol sensor of the present utility model.

[0029] Figure 6 is an S-shaped gas path structure diagram of the electrochemical alcohol sensor of the present utility model.

[0030] Figure 7 is an internal gas chamber diagram of the electrochemical alcohol sensor of the present utility model.

[0031] Figure 8 is Figure 7 a schematic diagram of the special process treatment area in the gas chamber.

[0032] Figure 9 is an S-shaped gas path simulation diagram of the electrochemical alcohol sensor of the present utility model.

[0033] Explanation of the reference numerals in the drawings:

[0034] 1 main air pipe, 2 electrochemical alcohol sensor, 21 cover plate, 22 gasket, 23 lead one, 24 electrode, 25 lead two, 26 socket, 261 deflector one, 262 deflector two, 263 boundary one, 264 boundary two, 265 boundary three, 266 boundary four, 27 glue, 28 circuit board, 3 connecting pipe, 4 air pump. Detailed implementation manners

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the core concept of the present utility model and the following embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0036] Embodiment 1, an electrochemical alcohol sensor, as Figure 6 and Figure 7 shown, includes a socket 26 with a gas chamber. Inside the gas chamber, a plurality of flow guiding plates are sequentially arranged along the gas flow path, and an electrode 24 connected to a circuit board 28 is arranged inside the gas chamber.

[0037] Specifically, as Figure 1 and Figure 2 shown, the electrochemical alcohol sensor 2 is connected between the main air pipe 1 and the connecting pipe 3. After the gas enters the electrochemical alcohol sensor 2 from the main air pipe 1, the gas chamber provides a stable environment for the internal gas reaction. The flow guiding plates can guide the gas entering the gas chamber, making the gas flow more smoothly, avoiding gas residue, and improving the reliability of the electrochemical alcohol sensor 2; and the gas flows through each flow guiding plate, extending the gas path, increasing the reaction time of the gas with the electrode 24, and improving the accuracy of the electrochemical alcohol sensor 2.

[0038] During use, the gas to be detected, under the action of the air pump 4, flows through the main air pipe 1 and then enters the sealed gas chamber of the electrochemical alcohol sensor 2. The electrode 24 inside the gas chamber undergoes a chemical reaction with the gas to be detected and generates chemical energy. The chemical energy is then converted into an electric current after energy conversion, and then transmitted to the circuit board 28 through a lead wire. The circuit board 28 then transmits the received electrical signal to the main circuit board of the alcohol detector, and the main circuit board determines the alcohol content based on the received electrical signal.

[0039] Embodiment 2, based on Embodiment 1, an electrochemical alcohol sensor, as Figure 5 shown, a flow guiding plate one 261 is provided at the inlet of the gas chamber, and a flow guiding plate two 262 is provided at the outlet of the gas chamber. The flow guiding plate one 261 and the flow guiding plate two 262 construct an S-shaped gas path inside the gas chamber. After the gas enters the gas chamber from the inlet, it sequentially flows through the flow guiding plate one 261 and the flow guiding plate two 262, forming an S-shaped path.

[0040] Embodiment 3, based on Embodiment 2, an electrochemical alcohol sensor, as Figure 6As shown, the inner peripheral wall of the air chamber is quadrilateral and includes boundary one 263, boundary two 264, boundary three 265, and boundary four 266. The first deflector 261 is inclinedly connected to boundary one 263, and the second deflector 262 is inclinedly connected to boundary three 265. The inlet is located between the included angle of boundary one 263 and the first deflector 261, and the outlet is located between the included angle of boundary three 265 and the second deflector 262. The first deflector 261 and the second deflector 262 can be parallel. The included angle between boundary one 263 and the first deflector 261 is an acute angle, and the included angle between boundary three 265 and the second deflector 262 is an acute angle.

[0041] Example 4. On the basis of Example 3, an electrochemical alcohol sensor, as Figure 6 shown, the included angle between the first deflector 261 and boundary one 263 is A1, 10° ≤ A1 ≤ 70°, and the included angle between the second deflector 262 and boundary three 265 is A2, 10° ≤ A2 ≤ 70°. The included angles between the first deflector 261 and boundary one 263 and between the second deflector 262 and boundary three 265 should enable the gas to pass smoothly and increase a certain gas flow path.

[0042] Example 5. On the basis of Example 4, an electrochemical alcohol sensor, as Figure 6 shown, the distance between boundary two 264 and boundary four 266 is L1, the distance between the first deflector 261 and boundary two 264 is b1, 0.2L1 ≤ b1 ≤ 0.5L1, the distance between the second deflector 262 and boundary four 266 is b2, 0.2L1 ≤ b2 ≤ 0.5L1, and the distance between the first deflector 261 and the second deflector 262 is C, 0.2L1 ≤ C ≤ 0.8L1.

[0043] Example 6. On the basis of Example 5, an electrochemical alcohol sensor, as Figure 6 shown, the base 26 is provided with an air inlet and an air outlet communicating with both ends of the air chamber. The diameter of the air inlet is X1, 0.3 ≤ X1 ≤ 3, and the diameter of the air outlet is X2, 0.3 ≤ X2 ≤ 3.

[0044] When implementing Example 6, as Figure 9 shown, the simulation diagram of the electrochemical alcohol sensor 2 shows that the rectifying effects of the first deflector 261 and the second deflector 262 are good. After rectification, the gas flow is smoother, avoiding gas remaining in the air chamber. At the same time, the gas path is lengthened, increasing the reaction time between the gas and the electrolyte on the electrode 24 and improving the accuracy of the electrochemical alcohol sensor 2.

[0045] Example 7. On the basis of Examples 1 - 6, an electrochemical alcohol sensor, as Figure 8As shown, a wear-resistant layer is provided on the inner wall of the gas chamber. The wear-resistant layer increases the friction of the gas in the gas path, reduces the flow rate and impact force of the gas in the gas path, weakens the loss of the electrolyte on the electrode, and improves the service life of the electrochemical alcohol sensor. The wear-resistant layer is achieved by adding stone patterns or sandblasting on the surface of the inner wall of the gas chamber, or other common surface treatment processes.

[0046] Example 8, based on Example 7, an electrochemical alcohol sensor, as Figure 3 - Figure 4 shown, the electrode 24 is connected to the circuit board 28 through lead 1 23 and lead 2 25. Lead 1 23 and lead 2 25 are respectively bonded to the socket 26. Lead 1 23 and lead 2 25 are sealed and fixed with glue. The glue prevents external gas and liquid from entering the electrochemical alcohol sensor 2. At the same time, the glue completely wraps lead 1 23 and lead 2 25, playing a protective role for lead 1 23 and lead 2 25, avoiding the breakage of lead 1 23 or lead 2 25 caused by vibration of the electrochemical alcohol sensor 2, and improving the seismic performance of the electrochemical alcohol sensor 2.

[0047] Example 9, based on Example 8, an electrochemical alcohol sensor, as Figure 2 shown, the circuit board 28 is fixedly connected to the bottom of the socket 26. A cover plate 21 is hermetically connected to the top of the socket 26. The electrode 24 is arranged between the gas chamber and the cover plate 21. The circuit board 28 can be fixed to the bottom of the socket 26 by hot melting or snap-fastening. The cover plate 21 is fixed to the top of the socket 26 by glue bonding, hot melting, screws, ultrasonic waves, etc., forming a sealed gas chamber to provide a stable environment for the gas reaction inside the gas chamber.

[0048] Example 10, based on Example 9, an electrochemical alcohol sensor, as Figure 3 shown, a gasket 22 is arranged between the electrode 24 and the cover plate 21. On the one hand, the gasket 22 is used to separate the electrode 24 and the cover plate 21. On the other hand, it can increase the connection tightness between the cover plate 21 and the socket 26.

[0049] The details not described in detail in the present invention are all well-known conventional technical means in the art.

[0050] The above content shows and describes the basic principle, main features and beneficial effects of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electrochemical alcohol sensor, characterized in that: It includes a socket (26) with an air chamber, and several flow guiding plates are successively arranged in the air chamber along the gas flow path, and an electrode (24) connected to a circuit board (28) is arranged in the air chamber.

2. The electrochemical alcohol sensor according to claim 1, characterized in that: A first flow guiding plate (261) is provided at the inlet of the air chamber, and a second flow guiding plate (262) is provided at the outlet of the air chamber. The first flow guiding plate (261) and the second flow guiding plate (262) construct an S-shaped gas path in the air chamber.

3. The electrochemical alcohol sensor according to claim 2, characterized in that: The inner peripheral wall of the air chamber is quadrilateral and includes a first boundary (263), a second boundary (264), a third boundary (265), and a fourth boundary (266). The first flow guiding plate (261) is inclinedly connected to the first boundary (263), the second flow guiding plate (262) is inclinedly connected to the third boundary (265), the inlet is located between the included angle of the first boundary (263) and the first flow guiding plate (261), and the outlet is located between the included angle of the third boundary (265) and the second flow guiding plate (262).

4. The electrochemical alcohol sensor according to claim 3, characterized in that: The included angle between the first flow guiding plate (261) and the first boundary (263) is A1, 10° ≤ A1 ≤ 70°, and the included angle between the second flow guiding plate (262) and the third boundary (265) is A2, 10° ≤ A2 ≤ 70°.

5. The electrochemical alcohol sensor according to claim 4, wherein: The distance between the second boundary (264) and the fourth boundary (266) is L1, the distance between the first flow guiding plate (261) and the second boundary (264) is b1, 0.2L1 ≤ b1 ≤ 0.5L1, the distance between the second flow guiding plate (262) and the fourth boundary (266) is b2, 0.2L1 ≤ b2 ≤ 0.5L1, and the distance between the first flow guiding plate (261) and the second flow guiding plate (262) is C, 0.2L1 ≤ C ≤ 0.8L1.

6. The electrochemical alcohol sensor according to claim 5, wherein: The socket (26) is provided with an air inlet and an air outlet that communicate with both ends of the air chamber.

7. The electrochemical alcohol sensor according to any one of claims 1-6, characterized in that: The inner wall of the air chamber is provided with a wear-resistant layer.

8. The electrochemical alcohol sensor according to claim 7, characterized in that: The electrode (24) is connected to the circuit board (28) through a first lead (23) and a second lead (25), and the first lead (23) and the second lead (25) are respectively bonded to the socket (26).

9. The electrochemical alcohol sensor according to claim 8, characterized in that: The circuit board (28) is fixedly connected to the bottom of the socket (26), a cover plate (21) is hermetically connected to the top of the socket (26), and the electrode (24) is arranged between the air chamber and the cover plate (21).

10. The electrochemical alcohol sensor according to claim 9, wherein: A gasket (22) is provided between the electrode (24) and the cover plate (21).

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