Anti-interference acetone gas sensor

Abstract

An anti-interference acetone gas sensor comprises a shell, a sensor body and a gas inlet channel, the sensor body and the gas inlet channel are arranged in the shell, one end of the gas inlet channel is communicated with the sensor body, the other end of the gas inlet channel penetrates through the shell and is used for being matched with a blowing nozzle for blowing in an inserted mode, and a mounting hole is further formed in the side portion, located on the gas inlet channel, of the shell in a penetrating mode. A detachable anti-interference mechanism is mounted in the mounting hole in a matched mode, the anti-interference mechanism comprises a carrier frame inserted in the mounting hole and an adsorption part arranged in the carrier frame, the front side and the rear side of the carrier frame are open so as to correspond to the sensor body and the blowing nozzle respectively, and a plurality of baffles are arranged in the carrier frame at intervals; the inner space of the carrier frame is planned into a continuous air duct distributed in a zigzag shape through the baffles, and the air duct is filled with the adsorption parts. According to the utility model, the detection precision is improved by reducing interference components in blowing of a patient.

Description

Technical Field

[0001] This utility model relates to the field of sensors, specifically an anti-interference acetone gas sensor. Background Technology

[0002] Utilizing the characteristic that abnormal metabolism in diabetic patients leads to elevated acetone levels in their exhaled breath, this new method of diabetes detection is safe, convenient, and relatively accurate.

[0003] Existing acetone sensors typically consist of a housing containing the sensor body and an air inlet channel. A disposable mouthpiece can be inserted into the end of the air inlet channel. The patient blows air into the mouthpiece, and the gas to be measured passes through the air inlet channel to the sensor body, exposing the gas-sensitive material within the sensor body to the gas. Oxygen molecules are adsorbed onto the surface of the gas-sensitive material fibers. The gas-sensitive material captures electrons, forming chemisorbed oxygen species. During this process, an electron-depleted layer forms on the material surface, leading to an increase in resistance. When the nanofibers are exposed to acetone, the ionized oxygen species react with acetone molecules, releasing electrons back into the conductive band. These released electrons increase the electron concentration, resulting in a decrease in resistance, thus allowing the acetone concentration to be characterized by the magnitude of the current.

[0004] During the above-mentioned testing process, the patient's breath contains water vapor, carbon dioxide, and other solid particulate impurities, which can interfere with the testing process. In particular, a large amount of water vapor adhering to the gas-sensitive material can block the contact between the gas-sensitive material and acetone molecules in some locations, thus limiting the detection accuracy. Utility Model Content

[0005] The present invention aims to provide an anti-interference acetone gas sensor that reduces interfering components in the patient's breath to improve detection accuracy.

[0006] To solve the above technical problems, the specific solution adopted by this utility model is as follows: an anti-interference acetone gas sensor, including a housing, a sensor body and an air inlet channel disposed within the housing, one end of the air inlet channel being connected to the sensor body, and the other end penetrating the housing and being inserted into a nozzle for blowing air, and a mounting hole being provided through the side of the air inlet channel on the housing, in which a detachable anti-interference mechanism is installed, the anti-interference mechanism including a carrier frame inserted into the mounting hole and an adsorption element disposed in the carrier frame, the front and rear sides of the carrier frame being open to correspond to the sensor body and the nozzle respectively, and multiple baffles being spaced apart within the carrier frame, the multiple baffles planning the internal space of the carrier frame into a continuous and zigzag-shaped air passage, the adsorption element being filled in the air passage.

[0007] Preferably, the adsorption element is a nonwoven fabric with a carbon dioxide absorption coating.

[0008] Preferably, the carbon dioxide absorption coating is an alkaline substance, an ion exchange resin, or silk fibroin.

[0009] Preferably, the top of the carrier frame is provided with a flange, which is detachably connected to the housing by screws or buckles, and a sealing ring is provided at the connection between the flange and the housing. The two sides of the carrier frame are respectively provided with sealing strips that seal against the side wall of the air intake channel. The bottom of the carrier frame is flexible and seals against the bottom wall of the air intake channel.

[0010] Preferably, the carrier frame includes a U-shaped frame that is inverted in the mounting hole and a cover that is detachably connected to the open position of the U-shaped frame. The cover is flexible and fits tightly with the bottom of the air intake channel.

[0011] Preferably, there are three baffles, all of which are distributed vertically, and the three baffles are distributed sequentially along the longitudinal direction of the air intake channel.

[0012] Preferably, the cover has a protrusion, and the open end face of the U-shaped frame or the corresponding baffle has a locking hole for positioning and engaging the protrusion.

[0013] Preferably, the cross-section of the air intake channel is rectangular, and the carrier frame is a rectangular frame of the corresponding shape.

[0014] Beneficial effects

[0015] This invention adds an anti-interference mechanism to the existing acetone sensor used for diabetes detection. The adsorption element in this mechanism effectively adsorbs water vapor, carbon dioxide, and particulate impurities from the patient's breath, significantly reducing the probability of these impurities adhering to the gas-sensitive material layer within the sensor body, thus improving detection accuracy. Furthermore, the anti-interference mechanism of this invention uses multiple baffles to create air channels for the adsorption element. In the extremely limited space of the air intake channel, the baffles are staggered to form a zigzag pattern, effectively increasing the travel distance and time of the breath through the adsorption element, thereby ensuring the adsorption effect of the adsorption element on water vapor, carbon dioxide, and particulate impurities. Finally, the anti-interference mechanism of this invention is easily detachable from the housing, facilitating the replacement of the internal adsorption element. This allows personnel to replace the adsorption element independently after a specific usage cycle or number of uses, thus maintaining the effectiveness of this invention.

[0016] In a preferred embodiment of this utility model, the carrier frame in the anti-interference mechanism consists of a U-shaped frame and a cover, and the baffle is set to three pieces, so that the air passage can be quickly exposed by removing the cover, thereby making the replacement of the adsorption component extremely convenient and further improving the ease of use of this utility model. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of an anti-interference acetone gas sensor according to the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of the right-side structure of the anti-interference mechanism section;

[0019] The markings in the diagram are: 1. Housing, 2. Anti-interference mechanism, 201. Sealing ring, 202. Screw, 203. Baffle, 204. U-shaped frame, 205. Adsorption component, 206. Vent, 207. Flanged edge, 208. Clip hole, 209. Protrusion, 210. Cover, 211. Sealing strip, 3. Insert, 4. Air intake channel, 5. Sensor body. Detailed Implementation

[0020] like Figure 1 As shown, this utility model discloses an anti-interference acetone gas sensor, primarily used for the diagnosis of diabetes. Similar to conventional acetone sensors used for diabetes testing, it includes a housing 1. Inside the housing 1, on the left side, is a sensor body 5 for detecting the acetone content in the gas to be tested. An air inlet channel 4 is located on the right side of the housing 1. The left end of the air inlet channel 4 connects to the sensor body 5, and the right end passes through the housing 1 to form a socket 3 for insertion into a disposable mouthpiece. When the patient blows into the mouthpiece, the gas to be tested reaches the sensor body 5 through the air inlet channel 4, and the sensor body 5 detects the acetone content.

[0021] Unlike conventional acetone sensors, this invention features a mounting hole at the top, into which an anti-interference mechanism 2 is installed. The anti-interference mechanism 2 mainly comprises a carrier frame and an adsorption element 205 disposed within the carrier frame. The carrier frame fixes the adsorption element 205 within the near-field channel. The adsorption element 205 is used to adsorb and remove water vapor, titanium dioxide, and other impurities from the gas to be measured, thereby improving the detection accuracy of this invention. Specifically:

[0022] Combination Figure 1 and Figure 2As shown, the carrier frame is a rectangular frame adapted to the rectangular air intake channel 4. Three vertically distributed baffles 203 are provided within the carrier frame. These three baffles 203 are arranged sequentially and staggered along the longitudinal direction of the air intake channel 4, forming a zigzag distribution within the carrier frame. This allows the gas to be measured to pass from the nozzle to the sensor body 5 via an air passage 206. The adsorption element 205 is filled within this air passage 206. Its material is a non-woven fabric with a carbon dioxide adsorption coating applied through soaking, coating, or embedding processes. The non-woven fabric itself can adsorb water vapor and particulate impurities through its fiber gaps, while the carbon dioxide adsorption coating is an alkaline substance (sodium hydroxide, sodium bicarbonate, or organic amine), ion exchange resin, or silk fibroin.

[0023] To ensure that the gas to be measured can pass through the adsorption element 205 as much as possible rather than bypassing it to reach the sensor body 5, this invention incorporates a multi-layered sealing structure on the carrier frame. For example... Figure 1 As shown, firstly, the top of the carrier frame is provided with a flange 207, which is fixedly connected to the housing 1 by screws 202, and a sealing ring 201 is provided between the flange 207 and the housing 1. Secondly, as... Figure 2 As shown, vertically distributed sealing strips 211 are provided on both sides of the carrier frame. The sealing strips 211 fit tightly against the side wall of the air intake channel 4 to achieve a seal. Finally, the structure of the carrier frame includes an inverted U-shaped frame 204 and a cover 210 that is fastened to the open bottom of the U-shaped frame 204. The U-shaped frame 204 is made of rigid plastic, and the cover 210 is made of flexible rubber or silicone. When the carrier frame is pressed down by the screws 202, the bottom of the cover 210 tightly contacts the bottom of the air intake channel 4, achieving a sealing effect.

[0024] The aforementioned cover 210 has a protrusion 209, and the bottom of the U-shaped frame 204 and the bottom of the baffle 203 fixed to the U-shaped frame 204 have corresponding locking holes 208 for engaging the protrusion 209, thus enabling quick assembly and disassembly of the cover 210 and the U-shaped frame 204. After quickly removing the cover 210 from the U-shaped frame 204, the bottom of the vent 206 is fully exposed, thereby enabling quick removal and refilling of the adsorption component 205.

Claims

1. An anti-interference acetone gas sensor, comprising a housing (1) and a sensor body (5) and an air inlet channel (4) disposed within the housing (1), wherein one end of the air inlet channel (4) is connected to the sensor body (5), and the other end passes through the housing (1) and is used for insertion and engagement of a blow nozzle, characterized in that: The housing (1) has a through-hole on the side of the air intake channel (4). A detachable anti-interference mechanism (2) is installed in the mounting hole. The anti-interference mechanism (2) includes a carrier frame inserted in the mounting hole and an adsorption component (205) set in the carrier frame. The front and rear sides of the carrier frame are open to correspond to the sensor body (5) and the mouthpiece, respectively. Multiple baffles (203) are spaced apart in the carrier frame. The multiple baffles (203) plan the internal space of the carrier frame into a continuous and zigzag-shaped air passage (206). The adsorption component (205) is filled in the air passage (206).

2. The anti-interference acetone gas sensor as described in claim 1, characterized in that: The adsorption element (205) is a non-woven fabric with a carbon dioxide absorption coating.

3. The anti-interference acetone gas sensor as described in claim 2, characterized in that: The carbon dioxide absorption coating is an alkaline substance, an ion exchange resin, or silk fibroin.

4. The anti-interference acetone gas sensor as described in claim 1, characterized in that: The top of the carrier frame is provided with a flange (207), which is detachably connected to the housing (1) by screws (202) or buckles. A sealing ring (201) is provided at the connection between the flange (207) and the housing (1). The two sides of the carrier frame are respectively provided with sealing strips (211) that are sealed to the side wall of the air intake channel (4). The bottom of the carrier frame is flexible and is sealed to the bottom wall of the air intake channel (4).

5. The anti-interference acetone gas sensor as described in claim 1, characterized in that: The carrier frame includes a U-shaped frame (204) inverted in the mounting hole and a cover (210) detachably connected to the open position of the U-shaped frame (204). The cover (210) is flexible and fits tightly with the bottom of the air intake channel (4).

6. The anti-interference acetone gas sensor as described in claim 5, characterized in that: There are three baffles (203) and they are all distributed vertically. The three baffles (203) are distributed sequentially along the longitudinal direction of the air intake channel (4).

7. An anti-interference acetone gas sensor as described in claim 6, characterized in that: The cover (210) has a protrusion (209), and the open end face of the U-shaped frame (204) or the corresponding baffle (203) has a locking hole (208) for positioning and engaging the protrusion (209).

8. The anti-interference acetone gas sensor as described in claim 1, characterized in that: The cross-section of the air intake channel (4) is rectangular, and the carrier frame is a rectangular frame of the corresponding shape.

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