External thermostat mechanism of exhaled breath alcohol content detector calibration device

Abstract

The utility model discloses an external constant temperature mechanism of exhaled gas alcohol content detector calibrating device, be provided with external box and external gas pipe, the front end of external gas pipe is used for connecting exhaled gas alcohol content detector calibrating device, the rear end of external gas pipe is used for connecting the exhaled gas alcohol content detector of detection, the middle part of external gas pipe passes through water bath heating bin and temperature adjusting bin in external box in proper order, water bath heating bin is heated through heating element, and the temperature adjusting bin is provided with the shower head, and the shower head is connected with cooling device, heating element and cooling device are connected with constant temperature control circuit. Advantageous effects: constant temperature control circuit is according to the actual temperature of water bath heating bin and the actual temperature of external gas pipe in temperature adjusting bin, combines and sets upper threshold temperature, lower threshold temperature and human exhaled gas temperature, controls heating element and cooling device opening and closing, dynamically adjusts the alcohol gas temperature of flowing through external gas pipe, makes it strict simulation human exhaled gas.

Description

Technical Field

[0001] This utility model relates to the field of gaseous alcohol concentration detection technology, and in particular to an external constant temperature mechanism for a breath alcohol content detector calibration device. Background Technology

[0002] Specialized workers, such as drivers of cars, trains, and airplanes, and workers in the petroleum, coal, or construction industries, need to undergo alcohol content testing before, during, and after their shifts. This is to prevent their blood alcohol content from exceeding national standards, avoid working under the influence of alcohol, prevent impaired environmental perception due to alcohol, which could lead to operational errors, and thus reduce safety risks in production.

[0003] Breath alcohol content detectors are important instruments for detecting whether a person has ingested alcohol and the amount in their body. The accuracy of their alcohol content detection needs to strictly match the national standards for alcohol content determination set by the manufacturer to avoid false detections and missed detections.

[0004] Therefore, breath alcohol content detectors need to be calibrated before leaving the factory and during use to determine whether their detection accuracy meets national standards, thus preventing defective products from entering the market and instruments from aging and not being replaced in time.

[0005] The breath alcohol content detector calibration device serves as a calibration tool for breath alcohol content detectors. It works by preparing alcohol solutions of various concentrations and generating alcohol gas at the same temperature as human exhaled breath. The breath alcohol content detector then detects the alcohol gas, and the accuracy of the breath alcohol content detector is determined by whether the detection result matches the concentration of the alcohol solution.

[0006] However, when dealing with large breathalyzers, a long hose is usually needed to transfer the alcohol gas between the breathalyzer and the detector, which causes the alcohol gas temperature to drop, making it impossible to accurately simulate human exhaled gas and resulting in a decrease in the accuracy of the test results. Utility Model Content

[0007] The purpose of this invention is to provide an external constant temperature mechanism for a breath alcohol content detector calibration device, which can keep the temperature of alcohol gas consistent with the temperature of human exhaled gas, so that the alcohol gas strictly simulates human exhaled gas, thereby improving the accuracy of the breath alcohol content detector calibration results.

[0008] The breath alcohol content detector calibration device has an external constant temperature mechanism, equipped with an external chamber and an external air tube. Its key features are:

[0009] The front end of the external air tube is used to connect to the exhaled breath alcohol content detector calibration device, and the rear end of the external air tube is used to connect to the exhaled breath alcohol content detector to be tested.

[0010] The middle part of the external air pipe passes through the water bath heating chamber and the temperature regulating chamber in the external box in sequence;

[0011] The water bath heating chamber is heated by a heating element, and a nozzle is installed in the temperature regulating chamber. The nozzle is connected to a cooling device.

[0012] The heating element and cooling device are connected to a constant temperature control circuit.

[0013] The constant temperature control circuit controls the heating element to heat the water bath heating chamber, and the constant temperature control circuit controls the cooling device to cool and adjust the external air tube, so that the temperature of the gas released from the external air tube is consistent with the temperature of human exhaled gas, strictly simulating human exhaled gas, thereby enhancing the accuracy of the exhaled gas alcohol content detector test results.

[0014] The cooling device in the above structure can be an ultrasonic atomizer.

[0015] Furthermore, a heating element mounting base is provided below the water bath heating chamber. The mounting base has a heating element mounting slot, in which the heating element is installed. The positive and negative terminals of the heating element pass through the heating element mounting base and are connected to the constant temperature control circuit.

[0016] The heating element mounting bracket isolates the heating element, thereby preventing it from affecting the circuitry and external enclosure.

[0017] Furthermore, a water tank is installed inside the external casing. The outlet of the water tank is connected to the inlet of the cooling device, and the outlet of the cooling device is connected to the nozzle, which is directly facing the external air pipe.

[0018] Furthermore, the constant temperature control circuit includes a processor, which is connected to a heating drive circuit, a cooling drive circuit, and a temperature acquisition circuit.

[0019] The heating drive circuit is equipped with a PNP transistor Q1. The base of transistor Q1 is connected to the control terminal CTRL1 of the processor via resistor R2. The collector of transistor Q1 is connected to one end of the coil of relay K1, and the other end of the coil of relay K1 is grounded. One end of the normally open switch of relay K1 is connected to the power supply, and the other end of the normally open switch of relay K1 is connected to the positive terminal of the heating element, and the negative terminal of the heating element is grounded. The emitter of transistor Q1 is connected to the power supply.

[0020] The cooling drive circuit is equipped with a PNP transistor Q2. The base of transistor Q2 is connected to the control terminal CTRL2 of the processor via resistor R4. The collector of transistor Q2 is connected to one end of the coil of relay K2, and the other end of the coil of relay K2 is grounded. One end of the normally open switch of relay K2 is connected to the power supply, and the other end of the normally open switch of relay K2 is connected to the positive terminal of the cooling device, and the negative terminal of the cooling device is grounded. The emitter of transistor Q2 is connected to the power supply.

[0021] Furthermore, the temperature acquisition circuit is equipped with a water bath temperature sensor and a temperature adjustment sensor, wherein: the water bath temperature sensor acquires the actual temperature of the water bath heating chamber, and the temperature adjustment sensor acquires the actual temperature of the internal and external air pipes of the temperature adjustment chamber.

[0022] The output terminal VIN of the water bath temperature sensor is connected to the input terminal TP1 of the processor. The output terminal VIN of the temperature sensor is also connected to the power supply via a series resistor R3. The power supply terminal VCC of the water bath temperature sensor is connected to the power supply, and the ground terminal CND of the water bath temperature sensor is grounded.

[0023] The output terminal VIN of the temperature sensor is connected to the input terminal TP2 of the processor. The output terminal VIN of the temperature sensor is also connected to the power supply via a series resistor R5. The power supply terminal VCC of the temperature sensor is connected to the power supply, and the ground terminal CND of the temperature sensor is grounded.

[0024] The constant temperature control circuit controls the heating element and the atomizing device to turn on and off based on the actual temperature of the water bath heating chamber and the actual temperature of the temperature adjustment section, combined with the set upper threshold temperature, lower threshold temperature and the temperature of the human body's exhaled gas, so as to achieve precise control of the actual temperature.

[0025] Furthermore, the water bath temperature sensor is installed on the outer wall of the water bath heating chamber;

[0026] The temperature regulating chamber has an external air pipe through hole on the side wall near the water bath heating chamber. The inner side wall of the external air pipe through hole has an arc-shaped sensor mounting groove. The temperature regulating sensor is installed in the sensor mounting groove and is in close contact with the external air pipe.

[0027] Furthermore, the external enclosure is also provided with a detector connection mechanism, which includes a detector connection chamber and a detector connection chamber cover that seals the detector connection chamber, wherein:

[0028] The detector connection chamber is located on the side wall of the external casing, and the detector connection chamber is connected to the external air pipe.

[0029] The inner wall of the detector connection chamber cover has a stepped through hole, which is used to connect to the exhaled breath alcohol content detector.

[0030] The axis of the external air tube coincides with the axis of the stepped through hole;

[0031] A sealing gasket is also installed between the detector connecting chamber and the detector connecting chamber cover.

[0032] The above structure can shorten the distance between the outlet of the external air tube and the air outlet of the detector, thereby reducing the temperature loss during the alcohol gas delivery process.

[0033] Furthermore, a flexible limiting ring is installed on the step of the stepped through hole;

[0034] The flexible limiting ring includes a rigid outer ring and a rubber skin fitted on the rigid outer ring, with an elastic airtight opening in the middle of the rubber skin.

[0035] The flexible airtight opening can adapt to the air blowing tubes of detectors with different diameters and can circumferentially wrap around the small opening section of the air blowing tube, so that the large opening section of the air blowing opening can stably fall into the detector connection chamber, realizing the airtight connection between the detector connection port and the air blowing tubes with different diameters, thereby realizing the function of one device matching multiple devices and enhancing the versatility of this utility model.

[0036] Furthermore, pressure rings and leak-proof washers are respectively installed on both sides of the flexible limiting ring, wherein:

[0037] The leak-proof gasket is located between the flexible limiting ring and the step of the stepped through hole;

[0038] The pressure ring is threadedly connected to the stepped through hole and abuts against the flexible limiting ring.

[0039] The above structure allows for easy replacement of flexible limiting rings of different sizes, enabling adjustment of the diameter of the elastic airtight opening. This prevents the diameter of the air inlet from far exceeding the maximum elasticity of the rubber skin, thus preventing the rubber skin from losing its elasticity and avoiding a weakening of the wrapping effect and sealing performance of the elastic airtight opening.

[0040] Furthermore, the external box is provided with a circuit installation compartment, and the constant temperature control circuit is installed in the circuit installation compartment, and the circuit installation compartment is higher than the liquid level of the water bath heating compartment;

[0041] The circuit installation compartment is also equipped with a power supply circuit, which supplies power to the constant temperature control circuit.

[0042] The circuit mounting compartment is positioned higher than the water bath heating compartment to prevent the water inside from damaging the circuit if the water bath heating compartment is damaged, thus ensuring the safety of the circuit.

[0043] Beneficial effects: 1. The constant temperature control circuit, based on the actual temperature of the water bath heating chamber and the actual temperature of the internal and external gas pipes of the temperature regulating chamber, combined with the set upper threshold temperature, lower threshold temperature, and the temperature of human exhaled gas, controls the on / off switching of the heating element and cooling device, thereby dynamically adjusting the temperature of the alcohol gas flowing through this invention.

[0044] The heating element heats the water in the water bath heating chamber, which covers the external gas pipe and conducts heat to it, thus ensuring that the low-temperature alcohol gas is fully heated in the heating section. To prevent overheating, the cooling device controls the nozzle to spray cooling water to cool the internal and external gas pipes of the temperature control chamber, thereby reducing the temperature of the overheated alcohol gas and making it consistent with the temperature of human exhaled gas.

[0045] In summary, this invention can strictly simulate human exhaled gas, thereby improving the accuracy of the exhaled gas alcohol content detector test results.

[0046] 2. This utility model is equipped with an elastic airtight opening that can adapt to the air blowing tubes of detectors with different diameters, and can circumferentially wrap around the small opening section of the air blowing tube, so that the large opening section of the air blowing opening can stably fall into the detector connection chamber, thereby realizing the airtight connection between the detector connection port and the air blowing tubes of different diameters, thus realizing the function of one device matching multiple devices and enhancing the versatility of this utility model. Attached Figure Description

[0047] Figure 1 This is a plan view of the present invention;

[0048] Figure 2 for Figure 1 Enlarged view of point a in the middle;

[0049] Figure 3 This is a top view of the interior of this utility model;

[0050] Figure 4 for Figure 3 Cross-sectional view at point AA;

[0051] Figure 5 This is a schematic diagram of the installation of the temperature sensor.

[0052] Figure 6 for Figure 4 Enlarged view of point c in the middle;

[0053] Figure 7 for Figure 3 Cross-sectional view at point BB;

[0054] Figure 8 This is a schematic diagram of the heating section layout;

[0055] Figure 9 A schematic diagram of the heating element arrangement;

[0056] Figure 10 This is the processor circuit diagram;

[0057] Figure 11 This is the driver circuit diagram;

[0058] Figure 12 This is a circuit diagram for temperature acquisition. Detailed Implementation

[0059] The specific embodiments and working principle of this utility model will be further described in detail below with reference to the accompanying drawings.

[0060] like Figure 1 , 3 As shown in Figures 4 and 6, the external constant temperature mechanism of the breath alcohol content detector calibration device includes an external chamber 1 and an external air tube 4, wherein:

[0061] The external enclosure 1 contains a water bath heating chamber 2, a temperature regulating chamber 50, a cooling device 6, a water tank 7, and an electrical circuit installation chamber 8.

[0062] The front end of the external air tube 4 is used to connect to the breath alcohol content detector calibration device; the rear end of the external air tube 4 is used to connect to the breath alcohol content detector to be tested; the middle part of the external air tube 4 passes through the water bath heating chamber 2 and the temperature regulating chamber 50 in the external box 1 in sequence.

[0063] like Figure 4 , 7 As shown, a heating element mounting base 3 is installed below the water bath heating chamber 2. The bottom of the water bath heating chamber 2 is provided with two downward protruding water bath heating chamber mounting blocks 2a. The heating element mounting base 3 has two water bath heating chamber mounting grooves 3b, and the two water bath heating chamber mounting blocks 2a are respectively embedded in the two water bath heating chamber mounting grooves 3b and fit together.

[0064] like Figure 4 , 7 As shown in Figure 9, the heating element mounting base 3 also has a heating element mounting groove 3a, which is located between the two water bath heating chamber mounting grooves 3b, and a heating element 5 is installed in the heating element mounting groove 3a, which heats the water bath heating chamber 2.

[0065] like Figure 4 , 9 As shown, the heating element 5 is an electric heating tube, and the positive and negative terminals of the electric heating tube pass through the heating element mounting base 3 and extend into the external box 1.

[0066] like Figure 3 , 4As shown, the cooling device 6 is located between the temperature regulating chamber 50 and the water tank 7, and the cooling device 6 can be an ultrasonic atomizer.

[0067] like Figure 3 , 4 As shown, the inlet of the ultrasonic atomizer is connected to the outlet of the water tank 7, and the outlet of the ultrasonic atomizer is connected to the nozzle 14 inside the temperature control chamber 50.

[0068] like Figure 1 , 4 As shown, the drain outlet of the temperature regulating chamber 50 is also connected to the outside via a drain pipe 16.

[0069] like Figure 8 As shown, the external gas pipe 4 inside the water bath heating chamber 2 is arranged in an "S" shape; the "S" shape arrangement of the external gas pipe 4 can increase the heating area and extend the heating time, so that the alcohol gas flowing through the external gas pipe 4 is fully heated.

[0070] like Figure 4 As shown, the nozzle 14 is directly opposite the internal and external air pipes 4 of the temperature control chamber 50.

[0071] like Figure 4 , 7 As shown in Figures 8 and 9, four parallel support platforms 12 are provided inside the water bath heating chamber 2. These support platforms 12 are used to support the external air pipe 4.

[0072] like Figure 3 , 4 As shown, a water bath temperature sensor 15 is installed on the outer wall of the water bath heating chamber 2, and the water bath temperature sensor 15 collects the actual temperature of the water bath heating chamber 2.

[0073] like Figure 4 , 5 As shown, the temperature regulating chamber 50 has an external air pipe through hole on the side wall near the water bath heating chamber 2. The external air pipe 4 extends into the temperature regulating chamber 50 through the external air pipe through hole, and the inner side wall of the external air pipe through hole has an arc-shaped sensor mounting groove. A temperature regulating sensor 13 is installed in the sensor mounting groove. The temperature regulating sensor 13 is close to the external air pipe 4 and is used to collect the actual temperature of the external air pipe 4 inside and outside the temperature regulating chamber 50.

[0074] like Figure 1 , 4 As shown in Figure 6, the external housing 1 is also provided with a detector connection mechanism, which includes a detector connection chamber 1a and a detector connection chamber cover 11 that seals the detector connection chamber 1a, wherein:

[0075] The detector connection chamber 1a is located on the side wall of the external box 1, and the detector connection chamber 1a is connected to the external air tube 4.

[0076] The inner wall of the detector connection chamber cover 11 has a stepped through hole 11a, which is used to connect to the exhaled breath alcohol content detector.

[0077] The axis of the external air tube 4 coincides with the axis of the stepped through hole 11a;

[0078] A flexible limiting ring 11b is installed on the step of the stepped through hole 11a. A pressure ring 11d and a leak-proof washer 11c are respectively installed on both sides of the flexible limiting ring 11b.

[0079] The leak-proof gasket 11c is located between the flexible limiting ring 11b and the step of the stepped through hole 11a;

[0080] The pressure ring 11d is threadedly connected to the stepped through hole 11a and abuts against the flexible limiting ring 11b.

[0081] A sealing gasket 10 is also installed between the detector connecting chamber 1a and the detector connecting chamber cover 11.

[0082] like Figure 1 , 2 As shown, one end of the detector connecting cavity cover 11 is connected to the outer box 1 via a torsion spring, and the other end of the detector connecting cavity cover 11 is locked to the side wall of the outer box 1 via a spring latch lock 17.

[0083] like Figure 1 , 4 As shown in Figure 6, the flexible limiting ring 11b includes a rigid outer ring 11b1 and a rubber skin 11b2 fitted on the rigid outer ring 11b1. An elastic airtight opening 11b3 is provided in the middle of the rubber skin 11b2.

[0084] like Figure 3 As shown, the circuit mounting chamber 8 is higher than the liquid level in the water bath heating chamber 2, and a constant temperature control circuit and a power supply circuit are installed inside the circuit mounting chamber 8, wherein:

[0085] like Figure 10 , 11 As shown in Figures 1 and 12, the constant temperature control circuit includes a processor, which is connected to a heating drive circuit, a cooling drive circuit, and a temperature acquisition circuit.

[0086] like Figure 11As shown in Figure a, the heating drive circuit is equipped with a PNP transistor Q1. The base of transistor Q1 is connected to the control terminal CTRL of the processor via resistor R2. The collector of transistor Q1 is connected to one end of the coil of relay K1, and the other end of the coil of relay K1 is grounded. One end of the normally open switch of relay K1 is connected to the power supply, and the other end of the normally open switch of relay K1 is connected to the positive terminal of the heating element, and the negative terminal of the heating element is grounded. The emitter of transistor Q1 is connected to the power supply.

[0087] like Figure 11 As shown in b, the cooling drive circuit is equipped with a PNP transistor Q2. The base of transistor Q2 is connected to the control terminal CTRL2 of the processor via resistor R4. The collector of transistor Q2 is connected to one end of the coil of relay K2, and the other end of the coil of relay K2 is grounded. One end of the normally open switch of relay K2 is connected to the power supply, and the other end of the normally open switch of relay K2 is connected to the positive terminal of the ultrasonic atomizer, and the negative terminal of the ultrasonic atomizer is grounded. The emitter of transistor Q2 is connected to the power supply.

[0088] like Figure 12 As shown in a, the output terminal VIN of the water bath temperature sensor 15 is connected to the input terminal TP1 of the processor. The output terminal VIN of the water bath temperature sensor 15 is also connected to the power supply via a series resistor R3. The power supply terminal VCC of the water bath temperature sensor 15 is connected to the power supply, and the ground terminal CND of the water bath temperature sensor 15 is grounded.

[0089] like Figure 12 As shown in b, the output terminal VIN of the temperature sensor 13 is connected to the input terminal TP2 of the processor. The output terminal VIN of the temperature sensor 13 is also connected to the power supply via a series resistor R5. The power supply terminal VCC of the temperature sensor 13 is connected to the power supply, and the ground terminal CND of the temperature sensor 13 is grounded.

[0090] When the actual temperature of the water bath heating chamber 2 exceeds the set upper threshold temperature, the processor controls the transistor Q1 to cut off, causing the relay K1 to disconnect, thereby stopping the heating coil. The heating coil has a lag, and at this time the actual temperature of the water bath heating chamber 2 will continue to rise slowly. Therefore, the upper threshold temperature is slightly lower than the temperature of human exhaled gas.

[0091] When the actual temperature of the water bath heating chamber 2 is lower than the set lower threshold temperature, the processor controls the transistor Q1 to conduct, causing the relay K1 to close, thereby restoring the heating coil to heat up.

[0092] When the actual temperature of the inner and outer air tubes 4 of the temperature-regulating chamber 50 exceeds the temperature of human exhaled gas, the processor controls the transistor Q2 to conduct, causing the relay K2 to close, opening the ultrasonic nebulizer so that the nozzle 14 sprays atomized cooling water to cool the inner and outer air tubes 4 of the temperature-regulating chamber 50; when the actual temperature of the inner and outer air tubes 4 of the temperature-regulating chamber 50 does not exceed the temperature of human exhaled gas, the transistor Q2 is cut off, causing the relay K2 to open, turning off the ultrasonic nebulizer, and stopping the cooling.

[0093] The power supply circuit supplies power to the constant temperature control circuit.

Claims

1. An external constant temperature mechanism for a breath alcohol content detector calibration device, comprising an external chamber (1) and an external air tube (4), characterized in that: The front end of the external air tube (4) is used to connect to the exhaled breath alcohol content detector calibration device, and the rear end of the external air tube (4) is used to connect to the exhaled breath alcohol content detector to be tested. The middle part of the external air pipe (4) passes through the water bath heating chamber (2) and the temperature regulating chamber (50) in the external box (1). The water bath heating chamber (2) is heated by the heating element (5), and the temperature regulating chamber (50) is equipped with a nozzle (14), which is connected to a cooling device (6). The heating element (5) and the cooling device (6) are connected to a constant temperature control circuit.

2. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 1, characterized in that: Below the water bath heating chamber (2) is a heating element mounting base (3), which has a heating element mounting slot (3a) and the heating element (5) is installed in the heating element mounting slot (3a). The positive and negative electrodes of the heating element (5) pass through the heating element mounting base (3) and are connected to the constant temperature control circuit.

3. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 1, characterized in that: The external box (1) is also equipped with a water tank (7), the outlet of which is connected to the inlet of the cooling device (6), the outlet of which is connected to the nozzle (14), and the nozzle (14) is facing the external air pipe (4).

4. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 3, characterized in that: The constant temperature control circuit includes a processor, which is connected to a heating drive circuit, a cooling drive circuit, and a temperature acquisition circuit. The heating drive circuit is equipped with a PNP transistor Q1. The base of transistor Q1 is connected to the control terminal CTRL1 of the processor via resistor R2. The collector of transistor Q1 is connected to one end of the coil of relay K1, and the other end of the coil of relay K1 is grounded. One end of the normally open switch of relay K1 is connected to the power supply, and the other end of the normally open switch of relay K1 is connected to the positive terminal of the heating element (5). The negative terminal of the heating element (5) is grounded. The emitter of transistor Q1 is connected to the power supply. The cooling drive circuit is equipped with a PNP transistor Q2. The base of transistor Q2 is connected to the control terminal CTRL2 of the processor via resistor R4. The collector of transistor Q2 is connected to one end of the coil of relay K2. The other end of the coil of relay K2 is grounded. One end of the normally open switch of relay K2 is connected to the power supply. The other end of the normally open switch of relay K2 is connected to the positive terminal of the cooling device (6). The negative terminal of the cooling device (6) is grounded. The emitter of transistor Q2 is connected to the power supply.

5. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 4, characterized in that: The temperature acquisition circuit is equipped with a water bath temperature sensor (15) and a temperature adjustment sensor (13), wherein: the water bath temperature sensor (15) acquires the actual temperature of the water bath heating chamber (2), and the temperature adjustment sensor (13) acquires the actual temperature of the air pipe (4) inside and outside the temperature adjustment chamber (50); The output terminal VIN of the water bath temperature sensor (15) is connected to the input terminal TP1 of the processor. The output terminal VIN of the water bath temperature sensor (15) is also connected to the power supply via a series resistor R3. The power supply terminal VCC of the water bath temperature sensor (15) is connected to the power supply, and the ground terminal CND of the water bath temperature sensor (15) is grounded. The output terminal VIN of the temperature sensor (13) is connected to the input terminal TP2 of the processor. The output terminal VIN of the temperature sensor (13) is also connected to the power supply via a series resistor R5. The power supply terminal VCC of the temperature sensor (13) is connected to the power supply, and the ground terminal CND of the temperature sensor (13) is grounded.

6. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 5, characterized in that: The water bath temperature sensor (15) is installed on the outer wall of the water bath heating chamber (2); The temperature regulating chamber (50) has an external air pipe through hole on the side wall near the water bath heating chamber (2). The inner side wall of the external air pipe through hole has an arc-shaped sensor mounting groove. The temperature regulating temperature sensor (13) is installed in the sensor mounting groove and is in close contact with the external air pipe (4).

7. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 1, characterized in that: The external enclosure (1) is also provided with a detector connection mechanism, which includes a detector connection chamber (1a) and a detector connection chamber cover (11) that seals the detector connection chamber (1a), wherein: The detector connection chamber (1a) is located on the side wall of the external box (1), and the detector connection chamber (1a) is connected to the external air pipe (4) air passage. The inner wall of the detector connection chamber cover (11) has a stepped through hole (11a), which is used to connect to the exhaled breath alcohol content detector. The axis of the external air tube (4) coincides with the axis of the stepped through hole (11a); A sealing gasket (10) is also installed between the detector connecting chamber (1a) and the detector connecting chamber cover (11).

8. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 7, characterized in that: A flexible limiting ring (11b) is installed on the step of the stepped through hole (11a). The flexible limiting ring (11b) includes a rigid outer ring (11b1) and a rubber skin (11b2) fitted on the rigid outer ring (11b1), wherein an elastic airtight opening (11b3) is provided in the middle of the rubber skin (11b2).

9. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 8, characterized in that: A pressure ring (11d) and a leak-proof washer (11c) are respectively installed on both sides of the flexible limiting ring (11b), wherein: The leak-proof gasket (11c) is located between the steps of the flexible limiting ring (11b) and the stepped through hole (11a); The pressure ring (11d) is threadedly connected to the stepped through hole (11a) and abuts against the flexible limiting ring (11b).

10. The external constant temperature mechanism of the breath alcohol content detector calibration device according to claim 1, characterized in that: The external box (1) is provided with a circuit installation compartment (8), and the constant temperature control circuit is installed in the circuit installation compartment (8), and the circuit installation compartment (8) is higher than the liquid level of the water bath heating compartment (2); The circuit mounting compartment (8) is also provided with a power supply circuit, which supplies power to the constant temperature control circuit.

Images