Blowing nozzle for gas detection, blowing nozzle joint and alcohol detector

Abstract

The embodiment of the utility model provides a blowing nozzle for gas detection, a blowing nozzle joint and an alcohol detector, the blowing nozzle for gas detection comprises a blowing nozzle part and a first mounting part, the blowing nozzle part is connected with the first mounting part, the blowing nozzle part comprises a first air inlet, and the first mounting part comprises a first air outlet; the first gas inlet is communicated with the first gas outlet through a first gas channel; wherein at least one part of the first mounting part is made of a conductive material, and the conductive material is used for being electrically connected with a blowing nozzle detection circuit so that the blowing nozzle detection circuit can detect the resistance value of the conductive material. According to the embodiment, the accuracy of alcohol detection results is improved.

Description

Technical Field

[0001] The present application relates to the field of gas detection equipment, and in particular to a mouthpiece for gas detection, a mouthpiece joint and an alcohol detector. Background Art

[0002] The breath alcohol tester is a tool used by traffic police to investigate drunk driving. The breath alcohol tester is equipped with a mouthpiece connector to fix a replaceable mouthpiece. The mouthpiece is disposable and a new mouthpiece is replaced after each test to ensure hygiene. In order to reduce costs, the disposable mouthpiece is generally made of plastic, paper, bamboo or wood, which are non-conductive materials. Compared with metal materials (such as iron, aluminum, copper), their conductivity is significantly different.

[0003] In the Chinese patent with application number 201120152280.X and titled "Alcohol detector mouthpiece and mouthpiece connector", the mouthpiece connector is mainly composed of several parts, including an air inlet, an air outlet, a pressure sensor connector and an alcohol sensor connector. Among them, the air inlet is located outside the alcohol detector housing, the air outlet is located outside the bottom shell of the alcohol detector, and the pressure sensor connector and the alcohol sensor connector are located inside the alcohol detector.

[0004] The main body of the mouthpiece of the patent document is composed of an upper mouthpiece and a lower mouthpiece, wherein the upper mouthpiece is a hollow conical tubular structure with a small upper part and a large lower part, and the lower mouthpiece is a hollow conical tubular structure with a large upper part and a small lower part. The lower end of the upper mouthpiece can be sleeved on the upper end opening of the lower mouthpiece, and the two sections are connected by an interference fit. The upper end of the upper mouthpiece has an opening as the mouthpiece air inlet, and the person being tested holds this end in his mouth to blow air. The lower end of the lower mouthpiece also has an opening as the mouthpiece air outlet, which is inserted into the matching alcohol detector mouthpiece joint. One end of the mouthpiece air outlet is provided with a mouthpiece air outlet pipe wall for inserting the mouthpiece joint. There can be a one-way membrane between the two sections. The membrane can be a circular thin film according to the shape of the airway, located between the two sections. When blowing air, the air flow can only flow in one direction and cannot blow in the opposite direction.

[0005] When the mouthpiece is inserted into the joint of the alcohol detector, the outer wall of the lower end of the lower mouthpiece contacts the inner wall of the mouthpiece joint, thereby fixing the mouthpiece so as not to fall off.

[0006] When using the alcohol tester, one end of the disposable mouthpiece is inserted into the air inlet of the alcohol tester, and the other end of the disposable mouthpiece is held in the mouth of the person being tested. When the person being tested blows, all the exhaled gas enters the alcohol tester through the mouthpiece. When the exhaled gas reaches a certain amount, for example 1.2 liters, the alcohol tester extracts a certain amount of exhaled gas for analysis and displays the alcohol content therein.

[0007] According to the provisions of my country's Metrology Law, alcohol testers are measuring instruments that are subject to mandatory national inspection and must obtain a type approval certificate before they can be produced, sold and used. Therefore, the disposable mouthpiece is also an indispensable supporting component of the alcohol tester and needs to undergo type approval testing together with the alcohol tester. After passing the test, other mouthpieces cannot be replaced at will, otherwise the exhalation resistance will change, which will not meet the conditions during the type approval test and will result in inaccurate alcohol test results.

[0008] At present, there are many businesses in the market that are selling counterfeit mouthpieces. In order to save costs, the materials, shapes, sizes, and structures of these mouthpieces are different from the original products. They do not meet the conditions of the alcohol tester type approval test and cannot be used for alcohol testing. However, since it is difficult to distinguish them from the appearance, it is actually difficult for end users to avoid using counterfeit products.

[0009] This patent hopes to technically prevent the use of non-original mouthpieces in alcohol testers to ensure the accuracy of alcohol test results. Utility Model Content

[0010] The embodiments of the present application provide a mouthpiece for gas detection, a mouthpiece joint and an alcohol detector to improve the accuracy of alcohol detection results.

[0011] In a first aspect, an embodiment of the present application provides a mouthpiece for gas detection, comprising a mouthpiece portion and a first mounting portion, wherein the mouthpiece portion is connected to the first mounting portion, the mouthpiece portion comprises a first air inlet, the first mounting portion comprises a first air outlet, and the first air inlet is connected to the first air outlet through a first gas channel;

[0012] Wherein, the mouthpiece is made of non-metallic material;

[0013] Wherein, at least a part of the first mounting portion is made of a conductive material, and the conductive material is used to be electrically connected to a mouthpiece detection circuit so that the mouthpiece detection circuit can detect a resistance value of the conductive material.

[0014] In an optional implementation manner of the present application, at least a portion of the surface of the first mounting portion is made of a conductive material.

[0015] In an optional implementation manner of the present application, the first mounting portion is entirely made of conductive material.

[0016] In an optional implementation manner of the present application, the material of the first mounting portion includes a mixture of carbon black or metal and plastic or wood or bamboo.

[0017] In an optional implementation of the present application, the plastic is one or more of polypropylene, polyethylene, and polyester.

[0018] In a second aspect, an embodiment of the present application provides a mouthpiece joint, comprising: a second air inlet, a second air outlet, and a second air channel connecting the second air inlet and the second air outlet;

[0019] The mouthpiece joint further comprises a conductive member, which is used to contact the conductive material of the first mounting portion of the mouthpiece and to be electrically connected to a mouthpiece detection circuit so that the mouthpiece detection circuit detects the resistance value of the conductive material.

[0020] In an optional embodiment of the present application, the nozzle joint further comprises a nozzle fixing seat and an air supply pipe, the nozzle fixing seat is connected to the air supply pipe, the second air inlet is located at an end of the nozzle fixing seat away from the air supply pipe, the second air outlet is located at an end of the air supply pipe away from the nozzle fixing seat, and the second gas channel runs through the nozzle fixing seat and the air supply pipe;

[0021] The nozzle fixing seat is provided with a nozzle mounting groove, a part of the conductive member is placed in the nozzle mounting groove, and another part of the conductive member is placed outside the nozzle fixing seat.

[0022] In an optional implementation manner of the present application, the mouthpiece fixing seat includes a seat body, a first fixing portion and a second fixing portion, one end of the seat body is connected to the air supply pipe, the first fixing portion and the second fixing portion are arranged at the other end of the seat body, the second fixing portion is arranged around the first fixing portion, and the outer side wall of the first fixing portion, the inner side wall of the second fixing portion and the other end of the seat body together form the mouthpiece mounting groove; or

[0023] The nozzle fixing seat comprises a seat body and a first fixing portion, one end of the seat body is connected to the air delivery pipe, the first fixing portion is arranged at the other end of the seat body, and the outer side wall of the first fixing portion and the other end of the seat body jointly define the nozzle mounting groove; or

[0024] The mouthpiece fixing seat includes a seat body portion and a second fixing portion, one end of the seat body portion is connected to the air supply pipe, and the second fixing portion is arranged at the other end of the seat body portion, and the inner side wall of the second fixing portion and the other end of the seat body portion jointly define the mouthpiece mounting groove.

[0025] In an optional embodiment of the present application, the conductive part includes a first electrical connection section and a second electrical connection section, the first electrical connection section is installed in the nozzle mounting groove, the second electrical connection section is connected to the first electrical connection section, and a portion of the second electrical connection section extends out of the nozzle fixing seat at one end of the nozzle fixing seat close to the air supply pipe.

[0026] In an optional implementation of the present application, a portion of the first electrical connection section is attached to a wall used to form the blowing nozzle mounting groove, and the first electrical connection section is bent in a direction away from the wall where it is located to form a conductive contact.

[0027] In an optional implementation manner of the present application, the conductive member further includes a fixed segment, and the first electrical connection segment is connected between the fixed segment and the second electrical connection segment;

[0028] The nozzle fixing seat is provided with a conductive member installation groove, the opening direction of the conductive member installation groove is the same as the opening direction of the nozzle installation groove, and at least a part of the fixing section is installed in the conductive member installation groove.

[0029] In an optional implementation manner of the present application, the fixing section is provided with a protrusion embedded in the nozzle fixing seat, and the protrusion is arranged obliquely relative to the fixing section.

[0030] In an optional implementation of the present application, the portion of the conductive member located in the blowing nozzle mounting groove can produce elastic deformation.

[0031] In an optional implementation manner of the present application, there are two conductive members, which are arranged at intervals on the nozzle fixing base.

[0032] In a third aspect, an embodiment of the present application provides an alcohol detector, which includes:

[0033] A mouthpiece, a gas detection mouthpiece as described above;

[0034] A mouthpiece joint, the mouthpiece joint as described above, wherein the mouthpiece is mounted in a mouthpiece mounting groove of the mouthpiece joint, and the conductive member is in contact with at least the conductive material of the first mounting portion; and

[0035] A mouthpiece detection circuit is electrically connected to the conductive material of the first mounting portion through the conductive member, and the mouthpiece detection circuit is used to detect the resistance value of the conductive material.

[0036] In an optional embodiment of the present application, there are two conductive members, which are spaced apart and arranged on the nozzle fixing seat, and the two conductive members are both in contact with the conductive material of the first mounting portion;

[0037] The mouthpiece detection circuit comprises a resistance detection unit and a second resistor, one end of the second resistor is electrically connected to the power supply of the alcohol detector, the other end of the second resistor is electrically connected to the resistance detection unit and one of the two conductive members, and the other of the two conductive members is grounded;

[0038] The resistance detection unit is used to detect the resistance value of the conductive material.

[0039] Beneficial effect: The alcohol detector of the embodiment of the present application can check whether the mouthpiece is an original mouthpiece through its mouthpiece detection circuit to improve the accuracy of the alcohol detection result. At least a part of the first mounting portion of the mouthpiece of the embodiment of the present application used to be mounted on the mouthpiece joint is made of a conductive material, and the conductive material can be equal to a resistance. When the mouthpiece is mounted on the mouthpiece joint, the mouthpiece can be electrically connected to the mouthpiece detection circuit of the alcohol detector through the conductive part of the mouthpiece joint, so that the mouthpiece detection circuit can detect the resistance value of the conductive material of the first mounting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0041] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0042] Figure 1 Schematic diagram of a mouthpiece in one embodiment of the present application.

[0043] Figure 2 Schematic diagram of a mouthpiece in one embodiment of the present application.

[0044] Figure 3 for Figure 2 Cross-sectional view of the mouthpiece along the AA direction.

[0045] Figure 4 It is a three-dimensional view of a mouthpiece joint in one embodiment of the present application.

[0046] Figure 5 It is a three-dimensional view of a mouthpiece joint in one embodiment of the present application.

[0047] Figure 6 It is a top view of a mouthpiece joint in one embodiment of the present application.

[0048] Figure 7 for Figure 6 A cross-sectional view of the mouthpiece joint along the B1-B1 direction.

[0049] Figure 8 for Figure 6 A cross-sectional view of the mouthpiece joint along the B2-B2 direction.

[0050] Fig. 9 This is a structural diagram of the assembly state of the mouthpiece and the mouthpiece joint in one embodiment of the present application.

[0051] Fig.10 It is a cross-sectional view of a mouthpiece and a mouthpiece joint in an assembled state in one embodiment of the present application.

[0052] Fig.11 It is a cross-sectional view of a mouthpiece and a mouthpiece joint in an assembled state in one embodiment of the present application.

[0053] Fig.12 This is a schematic block diagram of an alcohol detector in one embodiment of the present application.

[0054] Fig.13 Schematic diagram of a mouthpiece detection circuit in one embodiment of the present application.

[0055] In the figure:

[0056] 1. Alcohol tester part; 1000. Alcohol tester;

[0057] 10. Mouthpiece; 11. First air inlet; 12. First air outlet; 13. First gas channel; 14. One-way valve; 15. First mounting portion; 151. Outer wall; 152. Inner wall; 16. Mouthpiece; R1. First resistor;

[0058] 20. Mouthpiece joint; 21. Mouthpiece fixing seat; 211. First fixing part; 212. Second fixing part; 213. Mouthpiece mounting slot; 214. Conductive member mounting slot; 219. Seat body; 22. Gas pipe; 224. Pressure detection interface; 225. Alcohol detection interface; 23. Mounting ear; 231. Screw hole; 232. Reinforcement rib; 25. Conductive member; 251. Fixing section; D. Protrusion; 252. First electrical connection section; C. Conductive contact; 253. Second electrical connection section; 2531. First subsection; 2532. Second subsection; 201. Second air inlet; 202. Second air outlet; 203. Second gas channel;

[0059] 30. Mouthpiece detection circuit; Vcc, power supply; GND, ground terminal; R2, second resistor; 31. resistor detection unit. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. All other embodiments obtained by those skilled in the art without creative work based on the embodiments in the present application belong to the scope of protection of the present application.

[0061] Reference to "embodiment" or "implementation" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0062] like Figures 1 to 3 As shown, the embodiment of the present application provides a mouthpiece 10 for gas detection, which is referred to as the mouthpiece 10. The mouthpiece 10 includes a first air inlet 11, a first air outlet 12, and a first gas channel 13 connecting the first air inlet 11 and the first air outlet 12. Exemplarily, the mouthpiece 10 is tubular, the first air inlet 11 and the first air outlet 12 are respectively formed at both ends of the mouthpiece 10, and the first gas channel 13 is formed inside the mouthpiece 10.

[0063] The mouthpiece 10 includes a mouthpiece portion 16 and a first mounting portion 15. The mouthpiece portion 16 and the first mounting portion 15 may be directly connected or indirectly connected through other components. When in use, the mouthpiece portion 16 is used to contact the mouth of the subject to obtain the gas exhaled by the subject, and the first mounting portion 15 is used to connect with the gas detection device to deliver the gas exhaled by the subject to the gas detection device. The mouthpiece portion 16 and the first mounting portion 15 may be connected by mutual sleeve connection. For example, the first mounting portion 15 is sleeved on the mouthpiece portion 16; the mouthpiece portion 16 and the first mounting portion 15 may also be integrally formed. Among them, the first air inlet 11 is located at one end of the mouthpiece portion 16 away from the first mounting portion 15, the first air outlet 12 is located at one end of the first mounting portion 15 away from the mouthpiece portion 16, and the first gas channel 13 passes through the mouthpiece portion 16 and the first mounting portion 15 in the length direction of the mouthpiece 10. In other words, the mouthpiece portion 16 includes a first air inlet 11 , the first mounting portion 15 includes a first air outlet 12 , and the first air inlet 11 and the first air outlet 12 are connected via a first gas channel 13 .

[0064] The mouthpiece 10 further includes a one-way valve 14 disposed in the first gas channel 13. The one-way valve 14 may also be referred to as a check valve. The one-way valve 14 is used to allow the gas to be detected to flow from the first gas inlet 11 to the first gas outlet 12 through the first gas channel 13, and the one-way valve 14 is used to prevent the gas from flowing from the first gas outlet 12 to the first gas inlet 11.

[0065] Exemplarily, at least a portion of the first mounting portion 15 is made of a conductive material, and the conductive material is used to be electrically connected to the mouthpiece detection circuit so that the mouthpiece detection circuit can detect the resistance value of the conductive material, and then the mouthpiece detection circuit can determine the authenticity of the mouthpiece 10, that is, determine whether the mouthpiece 10 is an original mouthpiece. In other words, at least a portion of the first mounting portion 15 includes a conductive material.

[0066] Exemplarily, at least a portion of the first mounting portion 15 can be inserted into the mouthpiece mounting slot of the mouthpiece joint. In the embodiment of the present application, the portion of the first mounting portion 15 used to be inserted into the mouthpiece mounting slot of the mouthpiece joint includes a conductive material, so that the first mounting portion 15 is directly electrically connected to the conductive member installed on the mouthpiece joint in the mouthpiece mounting slot. In other embodiments, the first mounting portion 15 can also be electrically connected to the conductive member on the mouthpiece joint outside the mouthpiece mounting slot.

[0067] Exemplarily, at least a portion of the surface of the first mounting portion 15 is made of a conductive material. Exemplarily, the outer surface of the first mounting portion 15 is entirely made of a conductive material. Exemplarily, the inner surface of the first mounting portion is entirely made of a conductive material. Exemplarily, both the outer surface and the inner surface of the first mounting portion 15 are entirely made of a conductive material. Exemplarily, the entire first mounting portion 15 is entirely made of a conductive material, that is, the first mounting portion 15 is completely made of a conductive material.

[0068] The conductive material of the first mounting part 15 of the embodiment of the present application can be a mixed conductive material formed by mixing a conductive component such as metal or carbon black and a non-conductive component such as plastic or paper or bamboo or wood, such as a mixed conductive material formed by doping a conductive component in a non-conductive component, so that the first mounting part 15 can be equivalent to a resistor, which is beneficial for the mouthpiece detection circuit to detect the resistance value of the first mounting part 15. Exemplarily, the conductive material of the first mounting part 15 includes a mixture of carbon black or metal and plastic or paper or bamboo or wood, such as the first mounting part 15 is made of polypropylene injection molding mixed with carbon black, thereby, the first mounting part 15 itself can form a resistor. It should be noted that the plastic is not limited to polypropylene, and the plastic can be one or more of polypropylene, polyethylene, polyester and the like.

[0069] It should be noted that the volume resistivity of polypropylene materials such as hard polypropylene plastics reaches 1016~1018Ω·m, and its surface resistivity reaches 1016~1017Ω·m, so polypropylene is a high insulation material. After adding conductive materials such as carbon black to polypropylene, the conductive properties of polypropylene can be significantly improved, making it have a certain conductivity. The resistivity of polypropylene can be adjusted by adjusting the content of carbon black.

[0070] It should be understood that the conductive material of the embodiment of the present application is not limited thereto. It should be noted that the first mounting portion 15 of the embodiment of the present application is not limited to being made of a conductive component and a non-conductive component, as long as the resistance value of the first mounting portion 15 can be distinguished from the blow nozzle made entirely of insulating materials in the prior art. In other optional embodiments, the conductive material of the first mounting portion 15 can also be made entirely of conductive components such as metal without including non-conductive components.

[0071] In other embodiments, the surface of the first mounting portion 15 is coated with a conductive layer, and the conductive layer includes a conductive material, such as the outer surface of the first mounting portion 15 is coated with a conductive layer, or a conductive coating is applied on the first mounting portion 15 of the blowing nozzle 10 to form a resistor.

[0072] In other optional embodiments, a resistor element may be further provided on the first mounting portion 15 for electrically connecting to the mouthpiece detection circuit.

[0073] Exemplarily, the mouthpiece 16 is made of a non-metallic material. It should be understood that the mouthpiece 16 can be made of a non-metallic conductive material, or can be made of other non-conductive materials, such as paper or plastic or wood or bamboo. The non-conductive material in the embodiment of the present application can be understood as a non-conductive component. The above-mentioned non-metallic material refers to a material that does not contain a metal component, or a material that contains a metal component but has a non-metallic component as the main component.

[0074] Exemplarily, the mouthpiece 16 and the first mounting portion 15 are both made of conductive materials, such as a mixed conductive material formed by mixing metal or carbon black with plastic or paper or bamboo or wood. The mouthpiece 16 and the first mounting portion 15 are made of the same material to facilitate processing of the mouthpiece 16 and the first mounting portion 15.

[0075] Exemplarily, the mouthpiece 16 and the first mounting portion 15 are formed of different materials. Exemplarily, at least part of the first mounting portion 15 is made of conductive material, and the mouthpiece 16 is made of non-conductive material, such as the mouthpiece 16 is made of polypropylene material.

[0076] It should be noted that the first mounting part 15 of the embodiment of the present application includes a conductive material such as a conductive component and a non-conductive component. Compared with setting a resistor element on the first mounting part 15, the electrical connection method is more stable and there is no need to set additional components on the first mounting part 15, so that its structure is simple and the volume is reduced.

[0077] In order to adapt to the first mounting portion 15 of the mouthpiece 10, other components of the alcohol detector of the embodiment of the present application, such as the mouthpiece joint, are provided with a conductive member in the mouthpiece mounting groove of the mouthpiece joint. When the first mounting portion 15 of the mouthpiece 10 is inserted into the mouthpiece mounting groove, the conductive member of the mouthpiece joint can directly abut against the conductive material of the first mounting portion 15 to achieve electrical connection, which is beneficial for the mouthpiece detection circuit to perform detection. The following is a detailed description in conjunction with the mouthpiece joint and the drawings of the connection between the mouthpiece and the mouthpiece joint.

[0078] like Figures 4 to 11 As shown, the embodiment of the present application further provides a mouthpiece joint 20, and the mouthpiece joint 20 is connected to the mouthpiece 10. The embodiment of the present application defines the portion where the mouthpiece joint 20 and the mouthpiece 10 are connected together as part 1 of the alcohol detector. It should be understood that the alcohol detector may also include other components, which will be described below in conjunction with other drawings.

[0079] The nozzle joint 20 includes a second air inlet 201, a second air outlet 202 and a second gas channel 203 connecting the second air inlet 201 and the second air outlet 202. The second air inlet 201 and the second air outlet 202 are respectively formed at two ends of the nozzle joint 20, and the second gas channel 203 is formed inside the nozzle joint 20.

[0080] The mouthpiece connector 20 further includes a conductive member 25, which is used to contact the conductive material of the first mounting portion 15 of the mouthpiece 10 and to be electrically connected to the mouthpiece detection circuit so that the mouthpiece detection circuit can detect the resistance value of the conductive material.

[0081] The mouthpiece joint 20 also includes a mouthpiece fixing seat 21, an air supply pipe 22 and a mounting ear 23. The mouthpiece fixing seat 21 and the air supply pipe 22 are connected, such as being integrally arranged. The second air inlet 201 is located at one end of the mouthpiece fixing seat 21 away from the air supply pipe 22, the second air outlet 202 is located at one end of the air supply pipe 22 away from the mouthpiece fixing seat 21, and the second gas channel 203 runs through the mouthpiece fixing seat 21 and the air supply pipe 22. The second air outlet 202 is connected to the external atmosphere. When the mouthpiece joint 20 is connected to the shell structure of the alcohol detector, the second air outlet 202 is connected to the external atmosphere of the alcohol detector.

[0082] Exemplarily, the mouthpiece connector 20 also includes a pressure detection interface 224 and an alcohol detection interface 225 that are connected to the second gas channel 203, wherein the pressure detection interface 224 is used to communicate with the pressure sensor of the alcohol detector, and the alcohol detection interface 225 is used to communicate with the alcohol sensor of the alcohol detector. Exemplarily, the pressure detection interface 224 and the alcohol detection interface 225 are both arranged on the gas pipe 22. It should be noted that the pressure detection interface 224 and the alcohol detection interface 225 can also be arranged at other locations, and the embodiment of the present application does not limit the locations where the pressure detection interface 224 and the alcohol detection interface 225 are arranged.

[0083] The mouthpiece fixing base 21 is connected to the mouthpiece 10, such as the mouthpiece fixing base 21 is connected to the first mounting portion 15 of the mouthpiece. Exemplarily, the mouthpiece fixing base 21 is provided with a mouthpiece mounting groove 213, and at least a portion of the first mounting portion 15 is installed in the mouthpiece mounting groove 213 to realize the connection between the mouthpiece 10 and the mouthpiece joint 20. Exemplarily, the shape of the mouthpiece mounting groove 213 matches the shape of the first mounting portion 15.

[0084] In order to increase the connection stability between the mouthpiece fixing seat 21 and the first installation portion 15, the mouthpiece fixing seat 21 includes a seat body 219, a first fixing portion 211 and a second fixing portion 212, and the first fixing portion 211 and the second fixing portion 212 are arranged at the same end of the seat body 219. One end of the seat body 219 is connected to the air supply pipe 22, and the first fixing portion 211 and the second fixing portion 212 are arranged at the other end of the seat body 219. The second fixing portion 212 is arranged around the first fixing portion 211, or the second fixing portion 212 is sleeved on the outside of the first fixing portion 211, and the first fixing portion 211 and the second fixing portion 212 are arranged at intervals. The other end of the seat body 219, the outer side wall of the first fixing portion 211 and the inner side wall of the second fixing portion 212 together surround the mouthpiece mounting groove 213, that is, the mouthpiece mounting groove 213 is located between the outer side wall of the first fixing portion 211 and the inner side wall of the second fixing portion 212. When the first mounting portion 15 is installed in the nozzle mounting groove 213 , the first mounting portion 15 is restricted by the first fixing portion 211 and the second fixing portion 212 .

[0085] Exemplarily, the first mounting portion 15 can be embedded in the mouthpiece mounting groove 213, the inner side wall 152 of the first mounting portion 15 abuts against the outer side wall of the first fixing portion 211, and the outer side wall of the first mounting portion 15 abuts against the inner side wall of the second fixing portion 212, thereby, the first mounting portion 15 of the mouthpiece 10 is interference-connected with the first fixing portion 211 and the second fixing portion 212 of the mouthpiece joint 20. It can be understood that the first mounting portion 15 is inserted into the mouthpiece mounting groove 213, and the first fixing portion 211 and the second fixing portion 212 jointly generate a certain extrusion force on the first mounting portion 15 to achieve the fastening of the first mounting portion 15.

[0086] In other embodiments, the mouthpiece fixing seat 21 may include a first fixing portion 211 and a seat body portion 219, but not a second fixing portion 212, and the inner side wall of the first mounting portion 15 is interference-fitted with the outer side wall of the first fixing portion 211. In this embodiment, the mouthpiece mounting groove 213 is defined by the outer side wall of the first fixing portion 211 and the other end of the seat body portion 219.

[0087] In other embodiments, the mouthpiece fixing seat 21 may include a second fixing portion 212 and a seat body portion 219, but not the first fixing portion 211, and the outer wall of the first mounting portion 15 is interference fit with the inner wall of the second fixing portion 212. In this embodiment, the mouthpiece mounting groove 213 is defined by the inner wall of the second fixing portion 212 and the other end of the seat body portion 219. It should be noted that the connection method between the first mounting portion 15 and the mouthpiece fixing seat 21 is not limited to this, and the mouthpiece 10 can also be connected to the mouthpiece joint 20 through other structures, such as threads, buckles, etc.

[0088] It should be understood that the first mounting portion 15 is mounted on the mouthpiece mounting groove 213 at the position of the second air inlet 201, so that the first air inlet 11 is connected to the second gas channel 203. Therefore, when the test subject blows air from the first air inlet 11 of the mouthpiece 10, the air flow passes through the first gas channel 13, the first air outlet 12, and the second gas channel 203, and then the gas in the second gas channel 203 is divided into three paths, flowing to the second air outlet 202, the pressure detection interface 224, and the alcohol detection interface 225 respectively.

[0089] When the mouthpiece connector 20 is installed on the housing structure of the alcohol detector and the mouthpiece 10 is installed for alcohol detection, the pressure sensor connected to the pressure detection interface 224 detects the current blowing pressure. If the blowing pressure reaches the set range, the alcohol sensor extracts gas from the alcohol detection interface 225 through the air pump of the alcohol detector to detect the alcohol content, and the second air outlet 202 is used to discharge excess gas. In other embodiments, the pressure detection interface 224 and the alcohol detection interface 225 can also be directly connected to the first air outlet 12 or the first gas channel 13 of the mouthpiece 10 without passing through the second gas channel 203.

[0090] Exemplarily, a portion of the conductive member 25 is placed in the mouthpiece mounting groove 213, and the portion of the conductive member 25 located in the mouthpiece mounting groove 213 can abut against the conductive material of the first mounting portion 15, such as when the first mounting portion 15 is installed in the mouthpiece mounting groove 213, the conductive material of the first mounting portion 15 abuts against the conductive member 25 located in the mouthpiece mounting groove 213. It should be understood that the conductive member 25 has conductive properties, thereby achieving electrical connection between the conductive member 25 and the first mounting portion 15. For example, the conductive member 25 is made of conductive material, such as brass or conductive rubber. In other embodiments, the conductive member 25 can also abut against the conductive material of the first mounting portion 15 by its portion located outside the mouthpiece mounting groove 213.

[0091] Exemplarily, a portion of the conductive member 25 is placed outside the mouthpiece fixing base 21, and the portion of the conductive member 25 located outside the mouthpiece fixing base 21 can be electrically connected to the mouthpiece detection circuit of the alcohol detector, thereby realizing the electrical connection between the mouthpiece detection circuit and the first mounting part 15, which is beneficial for the mouthpiece detection circuit to detect the resistance value of the first mounting part 15.

[0092] Exemplarily, at least a portion of the conductive member 25 is elastic. For example, the portion of the conductive member 25 located in the mouthpiece mounting slot 213 is elastic. When the first mounting portion 15 is installed in the mouthpiece mounting slot 213, the first mounting portion 15 can squeeze the conductive member 25 so that the conductive member 25 is deformed in the mouthpiece mounting slot 213. The deformed conductive member 25 generates an elastic force, which acts on the first mounting portion 15 located in the mouthpiece mounting slot 213, which not only makes the conductive member 25 and the conductive material of the first mounting portion 15 more stably abutted, but also further increases the stability of the first mounting portion 15 installed in the mouthpiece mounting slot 213.

[0093] Exemplarily, the conductive member 25 is made of spring sheet.

[0094] Exemplarily, the conductive member 25 includes a first electrical connection section 252 and a second electrical connection section 253, and the first electrical connection section 252 and the second electrical connection section 253 are connected, such as being integrally arranged. The first electrical connection section 252 is installed in the nozzle mounting groove 213, and when the first mounting portion 15 is installed in the nozzle mounting groove 213, the first electrical connection section 252 and the conductive material of the first mounting portion 15 abut against each other. Exemplarily, a portion of the first electrical connection section 252 is attached to a wall used to form the nozzle mounting groove 213, such as a portion of the first electrical connection section 252 is attached to an inner side wall of the second fixing portion 212. The first electrical connection section 252 is bent away from the wall where it is located to form a conductive contact C. Exemplarily, the first electrical connection section 252 is bent away from the first electrical connection section 252 to attach to the second fixing portion 212 to form a conductive contact C. The conductive contact C can be deformed relative to the first electrical connection section 252. It should be noted that a portion of the first electrical connection segment 252 may also be attached to the outer wall of the first fixing portion 211 , and the first electrical connection segment 252 is bent away from the direction where the first electrical connection segment 252 is attached to the first fixing portion 211 to form a conductive contact C.

[0095] like Figure 8 and Fig.11 As shown, the specific connection process of the mouthpiece 10 and the mouthpiece connector 20 is as follows:

[0096] First, the first mounting portion 15 and the mouthpiece mounting groove 213 are aligned.

[0097] Then, the first mounting portion 15 is driven to be inserted into the nozzle mounting groove 213. During the insertion process, the first mounting portion 15 will contact with the conductive contact C, or abut against it.

[0098] Finally, the first mounting portion 15 is continuously driven so that the conductive contact C is deformed relative to the first electrical connection section 252. Specifically, the first mounting portion 15 squeezes the conductive contact C so that the conductive contact C is deformed toward the first electrical connection section 252. At this time, the conductive contact C generates a reverse force and acts on the first mounting portion 15. In the embodiment of the present application, at least the portion of the first mounting portion 15 connected to the conductive contact C has a conductive material, so that the conductive material of the first mounting portion 15 and the conductive contact C are electrically connected. At the same time, because the conductive contact C has a force acting on the conductive material, the electrical connection stability between the conductive contact C and the conductive material is greatly increased.

[0099] Among them, a part of the second electrical connection section 253 extends out of the mouthpiece fixing seat 21 at one end of the mouthpiece fixing seat 21 close to the gas supply pipe 22. Specifically, a part of the second electrical connection section 253 extends out of the seat body 219 at one end of the seat body 219 close to the gas supply pipe 22. Exemplarily, the second electrical connection section 253 includes a first sub-section 2531 and a second sub-section 2532, and the first sub-section 2531 and the second sub-section 2532 are connected, such as being integrally arranged. One end of the second sub-section 2532 is connected to the first electrical connection section 252, and the other end of the second sub-section 2532 is connected to one end of the first sub-section 2531, and the other end of the first sub-section 2531 extends outside the seat body 219. The first sub-section 2531 can be electrically connected to the mouthpiece detection circuit of the alcohol detector. Exemplarily, the first sub-portion 2531 and the second sub-portion 2532 are bent relative to each other, such as approximately perpendicularly, or a certain angle is formed between the first sub-portion 2531 and the second sub-portion 2532, such as the angle formed between the first sub-portion 2531 and the second sub-portion 2532 is approximately 90 degrees.

[0100] The conductive member 25 may further include a fixed section 251, and the fixed section 251 is connected to one end of the first electrical connection section 252 away from the second electrical connection section 253, such as being integrally arranged, so that the first electrical connection section 252 connects the fixed section 251 and the second electrical connection section 253. In the case where the conductive member 25 of the embodiment of the present application adopts a spring sheet, it can be integrally formed. The fixed section 251 is installed on the nozzle fixing seat 21, and illustratively, the fixed section 251 is installed on the first fixing portion 211 and / or the second fixing portion 212. Exemplarily, the fixed section 251 is installed on the first fixing portion 211, and the first fixing portion 211 is provided with a conductive member installation groove 214, and the opening direction of the conductive member installation groove 214 is the same as the opening direction of the nozzle installation groove 213. At least a portion of the fixed section 251 is installed in the conductive member installation groove 214.

[0101] In order to increase the stability of the fixing section 251 installed on the first fixing portion 211, the conductive member 25 further includes a protrusion D, which is embedded in the first fixing portion 211. Exemplarily, the fixing section 251 is provided with a protrusion D embedded in the first fixing portion 211, and the protrusion D is arranged obliquely relative to the fixing section 251 to prevent the fixing section 251 from falling off from the conductive member installation groove 214. The protrusion D is arranged obliquely relative to the fixing section 251, which can be understood as a barb structure being provided on the fixing section 251.

[0102] In other embodiments, the conductive member installation groove 214 may also be disposed on the first fixing portion 211 , so that the fixing segment 251 of the conductive member 25 is disposed on the first fixing portion 211 , thereby fixing the spring piece 25 through the first fixing portion 211 .

[0103] It should be noted that the conductive contact C formed by the first electrical connection section 252 of the conductive member 25 of the embodiment of the present application abuts against the outer wall of the first mounting portion 15 of the mouthpiece 10. In other optional embodiments, the electrical connection with the first mounting portion 15 of the mouthpiece 10 can also be achieved through a probe or other contact conductive structure.

[0104] Exemplarily, there are two conductive members 25, which are arranged at intervals on the mouthpiece fixing seat 21. It should be understood that two conductive member installation grooves 214 are provided on the mouthpiece fixing seat 21, and a fixing section 251 of a conductive member 25 is installed in one conductive member installation groove 214. The first electrical connection sections 252 of the two conductive members 25 are both arranged in the mouthpiece installation groove 213, and are symmetrically distributed along the mouthpiece installation groove 213. Similarly, the conductive member installation grooves 214 are symmetrically distributed along the mouthpiece installation groove 213. It should be understood that the two conductive members 25 are both electrically connected to the conductive material of the first mounting portion 15.

[0105] The air pipe 22 and the mounting ear 23 are connected, such as being integrally arranged, the mounting ear 23 is connected to one end of the air pipe 22 away from the mouthpiece fixing seat 21, and the mounting ear 23 is fixedly connected to the outer wall of the air pipe 22. Among them, the mounting ear 23 is provided with a screw hole 231 for fixing to the shell structure of the alcohol detector, thereby fixing the mouthpiece joint 20 to the shell structure of the alcohol detector. In other embodiments, the mouthpiece joint 20 can also be fixed to the shell structure of the alcohol detector by other structures such as pins and buckles. In order to increase the connection stability between the mounting ear 23 and the air pipe 22, at least one side of the mounting ear 23 of the embodiment of the present application is provided with a reinforcing rib 232, and the reinforcing rib 232 is also connected to the air pipe 22.

[0106] The embodiment of the present application also provides a gas detector, which includes a mouthpiece 10, a mouthpiece connector 20 and a detection device. The detection device may be a mouthpiece detection circuit. Exemplarily, the detection device may also include an alcohol sensor and a pressure sensor, the pressure sensor may detect the pressure of the gas to be tested, and the alcohol sensor may detect the alcohol content in the gas. The gas detector of the embodiment of the present application is described by taking an alcohol detector as an example.

[0107] like Fig.12 and Fig.13 As shown, the embodiment of the present application also provides an alcohol detector 1000, which includes a mouthpiece 10, a mouthpiece connector 20 and a mouthpiece detection circuit 30. The mouthpiece 10 and the mouthpiece connector 20 are shown in FIG. Figures 1 to 11 , I will not go into details here.

[0108] The alcohol detector 1000 of the embodiment of the present application is not limited thereto, and may also include a power supply Vcc, an alcohol sensor, a pressure sensor, an air pump, a housing structure, etc. The power supply Vcc, the alcohol sensor, the pressure sensor, the air pump, and the mouthpiece detection circuit 30 are all arranged on the housing structure, and the mouthpiece connector 20 is fixed to the housing structure of the alcohol detector 1000 through its mounting ear 23, and the conductive member 25 of the mouthpiece connector 20 is electrically connected to the mouthpiece detection circuit 30. The alcohol sensor is connected to the alcohol detection interface 225, and the pressure sensor is connected to the pressure detection interface 224. During the gas detection process, the pressure sensor detects the current gas pressure. If the pressure reaches the set range, the alcohol sensor extracts gas from the alcohol detection interface 225 through the air pump to detect the alcohol content. The power supply can be electrically connected to the alcohol sensor, the pressure sensor, the air pump, and the mouthpiece detection circuit 30 to power the alcohol sensor, the pressure sensor, the air pump, and the mouthpiece detection circuit 30.

[0109] The mouthpiece detection circuit 30 is electrically connected to the conductive member 25 of the mouthpiece connector 20, such as the mouthpiece detection circuit 30 is electrically connected to the second electrical connection section 253 of the conductive member 25, and specifically, the mouthpiece detection circuit 30 is electrically connected to the first subsection 2531 of the conductive member 25. After the first mounting portion 15 of the mouthpiece 10 is inserted into the mouthpiece mounting groove 213 of the mouthpiece connector 20, the conductive contact C of the conductive member 25 abuts against the first mounting portion 15, thereby electrically connecting with the conductive material of the first mounting portion 15, thereby achieving electrical connection between the mouthpiece detection circuit 30 and the conductive material of the first mounting portion 15. The mouthpiece detection circuit 30 can detect the resistance value of the conductive material of the first mounting portion 15 based on the conductive material of the first mounting portion 15. Exemplarily, the mouthpiece detection circuit 30 of the embodiment of the present application can detect the resistance value of the conductive material of the first mounting portion 15 to confirm whether the mouthpiece 10 is an original mouthpiece, or to confirm the authenticity of the mouthpiece 10.

[0110] The conductive material of the first mounting portion 15 in the embodiment of the present application is equivalent to a resistor. For the convenience of description, the equivalent resistor is referred to as the first resistor R1 hereinafter.

[0111] The mouthpiece detection circuit 30 includes a second resistor R2 and a resistor detection unit 31. The second resistor R2 is a resistor element with a known resistance value. One end of the second resistor R2 is electrically connected to the power supply Vcc, and the other end of the second resistor R2 is electrically connected to the detection end of the resistor detection unit 31 and one of the two conductive members 25. The other of the two conductive members 25 is electrically connected to the ground terminal GND. The resistor detection unit 31 is also electrically connected to the power supply Vcc and the ground terminal GND. In other embodiments, the positions of the first resistor R1 and the second resistor R2 can also be swapped, that is, one end of the second resistor R2 is electrically connected to the ground terminal GND, the other end of the second resistor R2 is electrically connected to the detection end of the resistor detection unit 31 and one of the two conductive members 25, and the other of the two conductive members 25 is electrically connected to the power supply Vcc.

[0112] According to relevant electrical knowledge, since the first resistor R1 and the second resistor R2 are connected in series, the ratio of the voltage value V1 loaded on the first resistor R1 to the voltage value V2 loaded on the second resistor R2 is equal to the ratio of the resistance value X1 of the first resistor R1 to the resistance value X2 of the second resistor R2, that is,

[0113] V1 / V2=X1 / X2 (1);

[0114] The second resistor R2 is a preset resistor element, and its resistance value X2 is known, and the resistance detection unit 31 can detect the voltage value V1 loaded on the first resistor R1 and the voltage value V2 loaded on the second resistor R2, that is, the voltage value V1 loaded on the first resistor R1 is the voltage between the ground terminal GND and the detection terminal of the resistance detection unit 31, and the voltage value V2 loaded on the second resistor R2 is the voltage between the power supply Vcc and the detection terminal of the resistance detection unit 31, so the resistance value X1 of the first resistor R1 can be calculated by the above calculation formula (1). Therefore, the resistance detection unit 31 can compare the calculated resistance value X1 of the first resistor R1 with the preset resistance value X0 to determine whether the mouthpiece is an original mouthpiece.

[0115] Due to the limitation of the production process, the resistance value X1 of the first resistor R1 (i.e., the conductive material of the mouthpiece 10) produced will fluctuate to a certain extent. The resistance value X1 of different mouthpieces 10 will have a certain deviation. When the contact position between the mouthpiece 10 and the conductive member 25 is different, the resistance value X1 of the first resistor R1 will also change to a certain extent. Therefore, a certain allowable deviation range X0±X d The tolerance range can be obtained through experimental testing. When the resistance value X1 of the first resistor R1 detected by the resistance detection unit 31 is within the preset range of X0±X dIf the resistance value X1 of the first resistor R1 detected by the resistance detection unit 31 exceeds the preset value X0±X d When the resistance value X1 of the first resistor R1 detected by the resistance detection unit 31 is infinite, it is determined that the currently inserted mouthpiece 10 is made of ordinary insulating material or no mouthpiece is installed, and the alcohol detector 1000 cannot be used.

[0116] The mouthpiece, mouthpiece joint and alcohol detector provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technicians in this field, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A mouthpiece for gas detection, characterized in that: include: A nozzle portion (16) and a first mounting portion (15), wherein the nozzle portion (16) and the first mounting portion (15) are connected; the nozzle portion (16) comprises a first air inlet (11), and the first mounting portion (15) comprises a first air outlet (12); the first air inlet (11) and the first air outlet (12) are connected via a first air channel (13); Wherein, the blowing nozzle (16) is made of non-metallic material; Wherein, at least a part of the first mounting portion (15) is made of a conductive material, and the conductive material is used to be electrically connected to a mouthpiece detection circuit (30) so that the mouthpiece detection circuit (30) can detect a resistance value of the conductive material.

2. The gas detection mouthpiece according to claim 1, characterized in that: At least a portion of the surface of the first mounting portion (15) is made of a conductive material.

3. The gas detection mouthpiece according to claim 2, characterized in that: The first mounting portion (15) is entirely made of conductive material.

4. The gas detection nozzle according to any one of claims 1 to 3, characterized in that: The conductive material includes a mixture of carbon black or metal and plastic or paper or bamboo or wood.

5. The gas detection mouthpiece according to claim 4, characterized in that: The plastic is one or more of polypropylene, polyethylene and polyester.

6. A mouthpiece joint, characterized in that: include: A second air inlet (201), a second air outlet (202), and a second air channel (203) connecting the second air inlet (201) and the second air outlet (202); The mouthpiece connector further comprises a conductive member (25), the conductive member (25) being used to contact the conductive material of the first mounting portion (15) of the mouthpiece and being used to be electrically connected to the mouthpiece detection circuit (30) so that the mouthpiece detection circuit (30) can detect the resistance value of the conductive material.

7. The mouthpiece joint according to claim 6, characterized in that: The nozzle joint (20) further comprises a nozzle fixing seat (21) and an air supply pipe (22), wherein the nozzle fixing seat (21) and the air supply pipe (22) are connected, the second air inlet (201) is located at one end of the nozzle fixing seat (21) away from the air supply pipe (22), the second air outlet (202) is located at one end of the air supply pipe (22) away from the nozzle fixing seat (21), and the second air channel (203) runs through the nozzle fixing seat (21) and the air supply pipe (22); The nozzle fixing seat (21) is provided with a nozzle mounting groove (213), a part of the conductive member (25) is placed in the nozzle mounting groove (213), and another part of the conductive member (25) is placed outside the nozzle fixing seat (21).

8. The mouthpiece joint according to claim 7, characterized in that: The nozzle fixing seat (21) comprises a seat body (219), a first fixing portion (211) and a second fixing portion (212); one end of the seat body (219) is connected to the air supply pipe (22); the first fixing portion (211) and the second fixing portion (212) are arranged at the other end of the seat body (219); the second fixing portion (212) is arranged around the first fixing portion (211); the outer side wall of the first fixing portion (211), the inner side wall of the second fixing portion (212) and the other end of the seat body (219) together form the nozzle mounting groove (213); or The nozzle fixing seat (21) comprises a seat body (219) and a first fixing portion (211), one end of the seat body (219) is connected to the air delivery pipe (22), the first fixing portion (211) is arranged at the other end of the seat body (219), and the outer side wall of the first fixing portion (211) and the other end of the seat body (219) jointly define the nozzle mounting groove (213); or The mouthpiece fixing seat (21) comprises a seat body portion (219) and a second fixing portion (212), one end of the seat body portion (219) is connected to the air supply pipe (22), the second fixing portion (212) is arranged at the other end of the seat body portion (219), and the inner side wall of the second fixing portion (212) and the other end of the seat body portion (219) jointly define the mouthpiece mounting groove (213).

9. The mouthpiece joint according to claim 7, characterized in that: The conductive member (25) comprises a first electrical connection section (252) and a second electrical connection section (253), wherein the first electrical connection section (252) is installed in the nozzle mounting groove (213), the second electrical connection section (253) is connected to the first electrical connection section (252), and a portion of the second electrical connection section (253) extends out of the nozzle fixing seat (21) at one end of the nozzle fixing seat (21) close to the air supply pipe (22).

10. The mouthpiece joint according to claim 9, characterized in that: A portion of the first electrical connection section (252) is attached to a wall used to form the nozzle mounting groove (213), and the first electrical connection section (252) is bent in a direction away from the wall where it is located to form a conductive contact (C).

11. The mouthpiece joint according to claim 9, characterized in that: The conductive member (25) further comprises a fixed section (251), and the first electrical connection section (252) is connected between the fixed section (251) and the second electrical connection section (253); The nozzle fixing seat (21) is provided with a conductive member installation groove (214), the opening direction of the conductive member installation groove (214) is the same as the opening direction of the nozzle installation groove (213), and at least a part of the fixing section (251) is installed in the conductive member installation groove (214).

12. The mouthpiece joint according to claim 11, characterized in that: The fixing section (251) is provided with a protrusion (D) embedded in the blowing nozzle fixing seat (21), and the protrusion (D) is arranged obliquely relative to the fixing section (251).

13. The blowing nozzle joint according to any one of claims 7 to 12, characterized in that: The portion of the conductive member (25) located in the blowing nozzle mounting groove (213) is capable of elastic deformation.

14. The blowing nozzle joint according to any one of claims 7 to 12, characterized in that: There are two conductive members (25) which are arranged at intervals on the blowing nozzle fixing seat (21).

15. An alcohol detector, characterized in that: include: A mouthpiece (10), a mouthpiece (10) for gas detection as claimed in any one of claims 1 to 5; A nozzle connector (20), according to any one of claims 6 to 14, wherein the nozzle (10) is installed in a nozzle mounting groove (213) of the nozzle connector (20), and the conductive member (25) abuts against the conductive material of the first mounting portion (15); and A mouthpiece detection circuit (30), wherein the mouthpiece detection circuit (30) is electrically connected to the conductive material of the first mounting portion (15) via the conductive member (25), and the mouthpiece detection circuit (30) is used to detect the resistance value of the conductive material.

16. The alcohol detector according to claim 15, characterized in that: There are two conductive members (25) which are arranged at intervals on the blowing nozzle fixing seat (21) of the blowing nozzle (10), and the two conductive members (25) are both in contact with the conductive material of the first mounting portion (15); The mouthpiece detection circuit (30) comprises a resistance detection unit (31) and a second resistor (R2), one end of the second resistor (R2) is electrically connected to a power source (Vcc) of the alcohol detector, the other end of the second resistor (R2) is electrically connected to the resistance detection unit (31) and one of the two conductive members (25), and the other of the two conductive members (25) is grounded; The resistance detection unit (31) is used to detect the resistance value of the conductive material.

Images