Electronic nose sampling device and use method thereof

Abstract

The invention discloses an electronic nose sampling device and a use method thereof. The device comprises a sampling head which is detachably mounted on an electronic nose body; a detection box is arranged in the electronic nose body and is communicated with the sampling head through an air inlet pipe; the air outlet pipe of the detection box is provided with an air extracting pump, and the air extracting pump is arranged in the electronic nose body; a supporting plate is fixed on the inner wall of the detection box, openings are formed in the edges of the two sides of the supporting plate, and a gas sensor array is arranged at the top end of the supporting plate; a gas distribution structure is arranged in the detection box, is arranged above the gas sensor array and is communicated with the gas inlet pipe. According to the invention, a to-be-detected gas sample is sucked into the detection box by using the sucking pump, so that the sampling speed of air is ensured; the sampling head is designed to be of a needle tube type structure, gas sampling can be conducted in a targeted mode, collected air makes effective contact with the gas sensor array through the arrangement of the gas distribution structure, and the accuracy of gas detection is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic noses, and in particular to an electronic nose sampling device and a use method thereof. Background Art

[0002] Electronic nose, also known as odor scanner, is an electronic system that uses the response pattern of a gas sensor array to identify odors. Electronic nose mainly consists of three functional components: odor sampler, gas sensor array and signal processing system.

[0003] Existing electronic noses usually directly use electronic nose samplers with open air inlets for sampling, but this sampler has certain disadvantages when used. First, the sampling air intake speed is slow; second, most of the samplers used are open-type, and most of the sampled gas is air, which cannot be sampled specifically, and the inspection error rate is very high.

[0004] Therefore, it is urgent to provide an electronic nose sampling device to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide an electronic nose sampling device and a method of using the same to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides an electronic nose sampling device, comprising a sampling head, which is detachably mounted on an electronic nose body; a detection box is fixedly arranged inside the electronic nose body, and the top of the detection box close to the sampling head is connected to an air inlet pipe, and the end of the air inlet pipe passes through the electronic nose body and is connected to the sampling head; the bottom of the detection box away from the air inlet pipe is connected to an air outlet pipe, and an air pump is installed on the air outlet pipe, and the air pump is fixedly mounted inside the electronic nose body; a support plate is fixedly connected to the inner wall of the detection box, and openings for gas passage are opened on the opposite side edges of the support plate, and a gas sensor array for gas detection is arranged on the top of the support plate; an air distribution structure is arranged in the detection box, and the air distribution structure is arranged above the gas sensor array, and the air distribution structure is connected to the air inlet pipe.

[0007] Preferably, the sampling head includes a sampling tube, a limiting step is provided on the inner side of one end of the sampling tube close to the air inlet pipe, the air inlet pipe is sleeved in the sampling tube and limitedly cooperates with the limiting step; a limiting ring is fixedly sleeved on the outer wall of one end of the sampling tube close to the air inlet pipe, a threaded sleeve is fixedly connected to the electronic nose body, the threaded sleeve is coaxially arranged with the air inlet pipe, and the limiting ring is arranged on the inner side of the threaded sleeve; a connecting sleeve is sleeved on the outer side of the sampling tube, the connecting sleeve abuts against the limiting ring, and the connecting sleeve is threadably cooperated with the outer wall of the threaded sleeve.

[0008] Preferably, a filter screen is provided between the air intake pipe and the limiting step, and the filter screen is slidably matched with the inner wall of the air intake pipe.

[0009] Preferably, the gas distribution structure includes an air distribution pipe, which is connected to the air inlet pipe and is arranged along the width direction of the detection box; the air distribution pipe is fixedly connected to a plurality of bronchi on the side away from the air inlet pipe, and the bronchi are arranged vertically to the air distribution pipe, and the distance between two adjacent bronchi is the same; a plurality of air outlets are opened at the bottom end of the bronchus, and the air outlets are arranged corresponding to the gas sensor array.

[0010] Preferably, a flow guide component is provided inside the air distribution pipe, and the flow guide component is used to divert the air entering the air distribution pipe.

[0011] Preferably, the guide assembly includes a guide cone, which is arranged corresponding to the outlet end of the air inlet pipe; a plurality of guide plates are symmetrically arranged on both sides of the guide cone, and the guide cone and the guide plates are fixedly mounted on the inner wall of the air distribution pipe, and the bronchial pipe is arranged corresponding to the gap between two adjacent guide plates; an arc plate is fixedly connected to one end of the guide plate away from the air inlet pipe, and the arc plate is arranged on the side of the guide plate close to the guide cone.

[0012] Preferably, the guide cone and the guide plate form an air distribution cavity near one end of the air inlet pipe, and the air distribution cavity has an isosceles triangle structure; air distribution openings of the air distribution cavity are formed between the guide cone and the guide plate and between two adjacent guide plates, and the widths of the air distribution openings increase successively in the direction away from the guide cone.

[0013] Preferably, a nozzle is installed at the air outlet, and the air outlet end of the nozzle is a trumpet-shaped structure.

[0014] Preferably, a sealing plate is fixedly connected to the top of the support plate, the sealing plate is an L-shaped structure, the opening is located on the side of the sealing plate away from the gas sensor array, the top of the sealing plate is fixedly connected to the inner wall of the detection box, and the bottom end of the sealing plate is provided with a plurality of air holes at equal intervals along the axial direction of the bronchus.

[0015] A method for using an electronic nose sampling device comprises the following steps:

[0016] S1. Install the sampling head onto the electronic nose body. Before installing the sampling head, place a filter at the limit step of the sampling head;

[0017] S2, evacuate the detection box, seal the air inlet of the sampling head with a sealing cap, and then start the vacuum pump to discharge the gas in the detection box until the detection value of the electronic nose is stable;

[0018] S3. Perform gas detection, align the sampling head with the gas sample to be detected, remove the blocking cap on the sampling head, and then the gas can be detected.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The electronic nose sampling device provided by the present invention, through the setting of an air pump, uses the air pump to generate suction to suck the gas sample to be detected into the detection box, thereby ensuring the sampling speed of the gas sample; the sampling head is designed as a needle-tube structure, and the inlet area is reduced, so that gas sampling can be carried out more specifically and the inhalation of useless air can be reduced. At the same time, through the setting of the air distribution structure, the collected air sample is made to contact the gas sensor array more evenly, thereby ensuring the accuracy of gas detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the structure of the electronic nose sampling device of the present invention;

[0023] Figure 2 Schematic diagram of the internal structure of the detection box of the present invention;

[0024] Figure 3 A schematic diagram of the internal structure of the detection box of the present invention from another perspective;

[0025] Figure 4It is a structural schematic diagram of the sampling head of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection between the sampling head and the electronic nose body of the present invention;

[0027] Figure 6 It is a schematic diagram of the internal structure of the air distribution structure of the present invention;

[0028] In the figure: 1. Electronic nose body; 2. Detection box; 3. Inlet pipe; 4. Outlet pipe; 5. Vacuum pump; 6. Support plate; 7. Gas sensor array; 8. Sampling tube; 9. Limiting step; 10. Limiting ring; 11. Threaded sleeve; 12. Connecting sleeve; 13. Filter; 14. Air distribution pipe; 15. Bronchus; 16. Guide cone; 17. Guide plate; 18. Arc plate; 19. Air distribution cavity; 20. Nozzle; 21. Sealing plate; 22. Air vent. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] like Figures 1 to 6 As shown, the present invention provides an electronic nose sampling device, comprising a sampling head, which is detachably mounted on an electronic nose body 1; a detection box 2 is fixedly arranged inside the electronic nose body 1, and an air inlet pipe 3 is connected to the top of the detection box 2 on a side close to the sampling head, and the end of the air inlet pipe 3 passes through the electronic nose body 1 and is connected to the sampling head; an air outlet pipe 4 is connected to the bottom of the detection box 2 on a side away from the air inlet pipe 3, and an air pump 5 is installed on the air outlet pipe 4, and the air pump 5 is fixedly mounted inside the electronic nose body 1; a support plate 6 is fixedly connected to the inner wall of the detection box 2, and openings for gas to pass through are opened on the opposite side edges of the support plate 6, and a gas sensor array 7 for gas detection is arranged on the top of the support plate 6; an air distribution structure is arranged in the detection box 2, and the air distribution structure is arranged above the gas sensor array 7, and the air distribution structure is connected to the air inlet pipe 3.

[0031] The present invention, through the setting of the vacuum pump 5, utilizes the vacuum pump 5 to generate suction, and sucks the gas sample to be detected into the detection box 2, so as to ensure the sampling speed of the gas sample; the sampling head is designed as a needle tube structure, and the inlet area is reduced, so that the gas sampling can be carried out more specifically. At the same time, through the setting of the air distribution structure, the collected air sample is more evenly contacted with the gas sensor array 7, thereby ensuring the accuracy of gas detection.

[0032] A further optimized solution is provided to facilitate the installation of the sampling head. The sampling head includes a sampling tube 8. A limiting step 9 is provided on the inner side of one end of the sampling tube 8 close to the air inlet pipe 3. The air inlet pipe 3 is sleeved in the sampling tube 8 and cooperates with the limiting step 9. A limiting ring 10 is fixedly sleeved on the outer wall of one end of the sampling tube 8 close to the air inlet pipe 3. A threaded sleeve 11 is fixedly connected to the electronic nose body 1. The threaded sleeve 11 is coaxially arranged with the air inlet pipe 3. The limiting ring 10 is arranged on the inner side of the threaded sleeve 11. A connecting sleeve 12 is sleeved on the outer side of the sampling tube 8. The connecting sleeve 12 abuts against the limiting ring 10, and the connecting sleeve 12 is threadedly matched with the outer wall of the threaded sleeve 11.

[0033] During installation, align the air intake pipe 3 with the sampling pipe 8, insert the air intake pipe 3 into the sampling pipe 8, and then insert the connecting sleeve 12 into the outer side of the sampling pipe 8, so that the connecting sleeve 12 contacts the limiting ring 10 on the sampling pipe 8, rotate the connecting sleeve 12, and thread the connecting sleeve 12 onto the outer side of the threaded sleeve 11. During this process, the connecting sleeve 12 will apply pressure to the limiting ring 10, thereby achieving a tight fit between the air intake pipe 3 and the sampling pipe 8 to prevent air leakage. In order to ensure the connection strength between the connecting sleeve 12 and the threaded sleeve 11, the length of the connecting portion between the connecting sleeve 12 and the threaded sleeve 11 is longer than the length of the contact portion between the connecting sleeve 12 and the limiting ring 10.

[0034] To further optimize the solution, in order to prevent impurities in the air from entering the detection box 2 and affecting the accuracy of the detection result, a filter 13 is arranged between the air inlet pipe 3 and the limiting step 9. The filter 13 slides with the inner wall of the air inlet pipe 3 to facilitate the replacement of the filter 13.

[0035] To further optimize the solution, the gas distribution structure includes an air distribution pipe 14, which is connected to the air inlet pipe 3 and is arranged along the width direction of the detection box 2; the air distribution pipe 14 is fixedly connected to a plurality of bronchial tubes 15 on the side away from the air inlet pipe 3, and the bronchial tubes 15 are arranged vertically to the air distribution pipe 14, and the distance between two adjacent bronchial tubes 15 is the same; a plurality of air outlets are opened at the bottom end of the bronchial tube 15, and the air outlets are arranged corresponding to the gas sensor array 7.

[0036] By disposing the gas branch pipe 14 and the bronchus 15 , the gas outlet of the bronchus 15 can cover the entire detection box 2 , so that the air flowing out of the bronchus 15 can better contact with the gas sensor array 7 on the support plate 6 .

[0037] A further optimization scheme is to ensure that the air entering the detection box 2 is distributed relatively evenly in the dust collecting box, a guide component is arranged inside the air distribution pipe 14, and the guide component is used to divert the air entering the air distribution pipe 14; the guide component includes a guide cone 16, and the guide cone 16 is arranged corresponding to the air outlet end of the air inlet pipe 3; a number of guide plates 17 are symmetrically arranged on both sides of the guide cone 16, and the guide cone 16 and the guide plate 17 are fixedly mounted on the inner wall of the air distribution pipe 14, and the bronchus 15 is arranged corresponding to the gap between the two adjacent guide plates 17; the end of the guide plate 17 away from the air inlet pipe 3 is fixedly connected to an arc plate 18, and the arc plate 18 is arranged on the side of the guide plate 17 close to the guide cone 16.

[0038] By setting the guide cone 16 and the guide plate 17, an air flow channel can be formed between the guide cone 16 and the guide plate 17 and between the guide plates 17 and 17, and the arc plate 18 on the guide plate 17 can be used to guide the airflow in the flow channel for a second time, so as to facilitate the air to directly enter the corresponding bronchus 15.

[0039] To further optimize the solution, in order to ensure that the amount of air entering each bronchus 15 is relatively uniform, the guide cone 16 and the guide plate 17 form an air distribution cavity 19 near one end of the air inlet pipe 3, and the air distribution cavity 19 is an isosceles triangle structure; air distribution openings of the air distribution cavity 19 are formed between the guide cone 16 and the guide plate 17 and between two adjacent guide plates 17, and the width of the air distribution openings increases successively in the direction away from the guide cone 16.

[0040] According to a further optimization scheme, in order to slow down the speed of air flowing out of the bronchus 15, a nozzle 20 is installed at the air outlet, and the air outlet end of the nozzle 20 is a trumpet-shaped structure.

[0041] A further optimized solution is to ensure effective contact between the air and the gas sensor array 7, a sealing plate 21 is fixedly connected to the top of the support plate 6, and the sealing plate 21 is an L-shaped structure. The opening is located on the side of the sealing plate 21 away from the gas sensor array 7, and the top of the sealing plate 21 is fixedly connected to the inner wall of the detection box 2, and the bottom end of the sealing plate 21 is provided with a plurality of air holes 22 at equal intervals along the axial direction of the bronchus 15.

[0042] A method for using an electronic nose sampling device comprises the following steps:

[0043] S1. Install the sampling head onto the electronic nose body 1. The specific installation process of the sampling head is as follows:

[0044] Before installing the sampling head, place a filter 13 at the limiting step 9 of the sampling tube 8; align the air inlet pipe 3 with the sampling tube 8, and insert the air inlet pipe 3 into the sampling tube 8, then insert the connecting sleeve 12 into the outer side of the sampling tube 8, so that the connecting sleeve 12 contacts the limiting ring 10 on the sampling tube 8, rotate the connecting sleeve 12, and thread the connecting sleeve 12 onto the outer side of the threaded sleeve 11. During this process, the connecting sleeve 12 will apply pressure to the limiting ring 10, thereby achieving a close fit between the air inlet pipe 3 and the sampling tube 8 to prevent air leakage, and complete the installation of the sampling head.

[0045] S2, evacuate the detection box 2, use the blocking cap to block the air inlet end of the sampling head, and then start the vacuum pump 5 to discharge the gas in the detection box 2 until the detection value of the electronic nose is stable;

[0046] By discharging the excess gas in the detection box 2, the detection result of the air to be detected can be avoided from being affected. Moreover, after the air is discharged from the detection box 2, a negative pressure state will be formed in the detection box 2, which is conducive to the entry of air into the detection box 2 during detection.

[0047] S3. Perform gas detection, align the sampling head with the gas sample to be detected, remove the blocking cap on the sampling head, and then the gas can be detected.

[0048] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. An electronic nose sampling device, characterized in that: The electronic nose device comprises a sampling head, which is detachably mounted on an electronic nose body (1); a detection box (2) is fixedly arranged inside the electronic nose body (1); a top end of the detection box (2) close to the sampling head is connected to an air inlet pipe (3); the end of the air inlet pipe (3) passes through the electronic nose body (1) and is connected to the sampling head; a bottom end of the detection box (2) away from the air inlet pipe (3) is connected to an air outlet pipe (4); an air pump (5) is installed on the air outlet pipe (4); the air pump (5) is fixedly mounted inside the electronic nose body (1); a support plate (6) is fixedly connected to the inner wall of the detection box (2); openings for gas to pass through are provided on opposite side edges of the support plate (6); a gas sensor array (7) for gas detection is arranged on the top of the support plate (6); a gas distribution structure is arranged inside the detection box (2); the gas distribution structure is arranged above the gas sensor array (7) and is connected to the air inlet pipe (3).

2. The electronic nose sampling device according to claim 1, characterized in that: The sampling head comprises a sampling tube (8), a limiting step (9) is arranged on the inner side of one end of the sampling tube (8) close to the air inlet pipe (3), the air inlet pipe (3) is sleeved in the sampling tube (8) and is limitedly matched with the limiting step (9); a limiting ring (10) is fixedly sleeved on the outer wall of one end of the sampling tube (8) close to the air inlet pipe (3), a threaded sleeve (11) is fixedly connected to the electronic nose body (1), the threaded sleeve (11) is coaxially arranged with the air inlet pipe (3), and the limiting ring (10) is arranged on the inner side of the threaded sleeve (11); a connecting sleeve (12) is sleeved on the outer side of the sampling tube (8), the connecting sleeve (12) is in contact with the limiting ring (10), and the connecting sleeve (12) is threadedly matched with the outer wall of the threaded sleeve (11).

3. The electronic nose sampling device according to claim 2, characterized in that: A filter screen (13) is provided between the air intake pipe (3) and the limiting step (9), and the filter screen (13) is slidably matched with the inner wall of the air intake pipe (3).

4. The electronic nose sampling device according to claim 1, characterized in that: The gas distribution structure comprises an air distribution pipe (14), the air distribution pipe (14) is connected to the air inlet pipe (3), and the air distribution pipe (14) is arranged along the width direction of the detection box (2); a side of the air distribution pipe (14) away from the air inlet pipe (3) is fixedly connected to a plurality of bronchial tubes (15), the bronchial tubes (15) are arranged vertically to the air distribution pipe (14), and the distance between two adjacent bronchial tubes (15) is the same; a plurality of air outlets are opened at the bottom end of the bronchial tube (15), and the air outlets are arranged corresponding to the gas sensor array (7).

5. The electronic nose sampling device according to claim 4, characterized in that: A flow guide component is arranged inside the air distribution pipe (14), and the flow guide component is used to divert the air entering the air distribution pipe (14).

6. The electronic nose sampling device according to claim 5, characterized in that: The guide assembly comprises a guide cone (16), and the guide cone (16) is arranged corresponding to the air outlet end of the air inlet pipe (3); a plurality of guide plates (17) are symmetrically arranged on both sides of the guide cone (16), and the guide cone (16) and the guide plates (17) are both fixedly mounted on the inner wall of the air distribution pipe (14), and the bronchial pipe (15) and the gap between two adjacent guide plates (17) are arranged correspondingly; an end of the guide plate (17) away from the air inlet pipe (3) is fixedly connected to an arc plate (18), and the arc plate (18) is arranged on a side of the guide plate (17) close to the guide cone (16).

7. The electronic nose sampling device according to claim 6, characterized in that: The guide cone (16) and the guide plate (17) form an air distribution cavity (19) at one end close to the air inlet pipe (3), and the air distribution cavity (19) is in the form of an isosceles triangle structure; an air distribution port of the air distribution cavity (19) is formed between the guide cone (16) and the guide plate (17) and between two adjacent guide plates (17), and the width of the air distribution port increases gradually in a direction away from the guide cone (16).

8. The electronic nose sampling device according to claim 4, characterized in that: A nozzle (20) is installed at the air outlet, and the air outlet end of the nozzle (20) is a trumpet-shaped structure.

9. The electronic nose sampling device according to claim 4, characterized in that: The top end of the support plate (6) is fixedly connected to a blocking plate (21), the blocking plate (21) being an L-shaped structure, the opening being located on a side of the blocking plate (21) away from the gas sensor array (7), the top end of the blocking plate (21) being fixedly connected to the inner wall of the detection box (2), and the bottom end of the blocking plate (21) being provided with a plurality of air holes (22) at equal intervals along the axial direction of the bronchus (15).

10. A method for using the electronic nose sampling device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, installing the sampling head on the electronic nose body (1), and before installing the sampling head, placing a filter (13) at the limiting step (9) of the sampling head; S2, evacuating the detection box (2), using a blocking cap to block the air inlet end of the sampling head, and then starting the vacuum pump (5) to discharge the gas in the detection box (2) until the detection value of the electronic nose is stable; S3. Perform gas detection, align the sampling head with the gas sample to be detected, remove the blocking cap on the sampling head, and then the gas can be detected.

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