Gas detection device

Abstract

The utility model discloses a gas detection device, and aims to provide a gas detection device which is simple in structure, convenient to manufacture and capable of monitoring ammonia gas in a toilet place in real time. The shell is provided with a plurality of air inlet holes communicated with an inner cavity of the shell; the control circuit board is arranged in the shell; the ammonia gas sensor is used for detecting the concentration of ammonia gas in the air, is positioned in the inner cavity of the shell and is electrically connected with the control circuit board; the indicating lamp is electrically connected with the control circuit board; and the data interface is arranged on the shell, is electrically connected with the control circuit board, and can provide a power supply and / or data transmission for the gas detection device.

Description

Technical Field

[0001] The utility model relates to the field of gas detection, and particularly to a gas detection device. Background Art

[0002] The main gases affecting the air quality in toilet and bathroom areas are stinky gases such as ammonia. When the ammonia concentration exceeds the standard, the air quality is low, which will cause certain harm to the human body. With the improvement of the overall living standard of people, more and more public places carry out air quality detection, and it has gradually developed into an important part of indoor air treatment and has been popularized in many office buildings.

[0003] By detecting the ammonia concentration in the toilet and bathroom areas in real time, the current air quality status can be known. If the ammonia concentration exceeds the standard, the indoor fresh air system can be triggered to circulate and process the air. Therefore, it is very important to make an ammonia detection device suitable for toilet and bathroom areas. Content of the Utility Model

[0004] The purpose of the utility model is to provide a gas detection device with a simple structure, convenient production, and capable of real-time monitoring of ammonia in toilet and bathroom areas.

[0005] The technical solution of the utility model is as follows:

[0006] A gas detection device, comprising:

[0007] A housing, on which there are a number of air inlet holes communicating with the inner cavity of the housing;

[0008] A control circuit board, arranged inside the housing;

[0009] An ammonia sensor for detecting the ammonia concentration in the air, which is located inside the inner cavity of the housing, and the ammonia sensor is electrically connected to the control circuit board;

[0010] An indicator light, electrically connected to the control circuit board;

[0011] A data interface, arranged on the housing and electrically connected to the control circuit board, which can provide power supply and / or data transmission for the gas detection device. The specific operation of the gas detection device in this solution is as follows: The ammonia sensor is used to detect the ammonia concentration content in the air, the control circuit board is used to receive and process the data detected by the ammonia sensor, and the indicator light is used to feedback the working status of the gas detection device. For example, when the gas detection device is working normally and the ammonia concentration is not exceeding the standard, the indicator light flashes at a set frequency; when the ammonia sensor monitors that the ammonia concentration content exceeds the standard, the indicator light is always on; when the control circuit board detects that the ammonia sensor is in a faulty and abnormal working state, the indicator light is always on.

[0012] On the other hand, since the data interface can provide an interface for transmitting data to the gas detection device, the data interface can be connected to the fresh air equipment in the room through a wire. When the ammonia sensor detects that the ammonia concentration exceeds the standard, the control circuit board can send a signal to the controller of the fresh air equipment for ventilation or circulation processing. The gas detection device of this solution has a simple structure and is easy to manufacture, can monitor ammonia in toilet and bathroom places in real time, and meets the actual scenario usage requirements.

[0013] Preferably, it further includes a mounting bracket provided with mounting holes. The housing includes a bottom shell, and the bottom shell is connected to the mounting bracket by a buckle or a bolt. The gas detection device of this solution is suitable for ceiling mounting or side wall mounting, and is easy to install. For example, the mounting bracket is installed on the indoor top wall through bolts, and then the bottom shell is connected to the mounting bracket by a buckle or a bolt to achieve ceiling mounting of the gas detection device; or the mounting bracket is installed on the indoor side wall through bolts, and then the bottom shell is connected to the mounting bracket by a buckle or a bolt to achieve side wall mounting of the gas detection device.

[0014] Preferably, the ammonia sensor is an electrochemical ammonia sensor, and the air inlet of the electrochemical ammonia sensor faces the bottom shell. The gas detection device of this solution is suitable for ceiling mounting. Specifically, since the electrochemical ammonia sensor has an internal electrolyte or generates liquid after reaction, to ensure the normal use of the sensor and prevent liquid leakage, the air inlet of the sensor needs to be arranged upward. Based on this, when the mounting bracket is installed on the indoor top wall through bolts and then the bottom shell is connected to the mounting bracket by a buckle or a bolt to achieve ceiling mounting of the gas detection device, since the air inlet of the electrochemical ammonia sensor faces the bottom shell, the air inlet of the sensor can be ensured to be arranged upward, ensuring the normal operation of the electrochemical ammonia sensor. On the other hand, setting the ammonia sensor of this solution as an electrochemical ammonia sensor also has the advantages of high detection accuracy, low power consumption, high resolution, and low detection limit.

[0015] Preferably, the control circuit board includes a main control board installed on the bottom shell and a sensor circuit board electrically connected to the main control board. The sensor circuit board is located between the main control board and the front shell. The electrochemical ammonia sensor is installed on the sensor circuit board, and the electrochemical ammonia sensor is located between the sensor circuit board and the main control board. In this way, on the one hand, the electrochemical ammonia sensor can be electrically connected to the main control board; on the other hand, the air inlet of the electrochemical ammonia sensor can face the bottom shell, and the structure is simple and easy to manufacture.

[0016] Preferably, the part of the main control board corresponding to the electrochemical ammonia sensor is set as a hollow structure. In order to further ensure the stability of the air inlet channel of the electrochemical ammonia sensor, the part of the main control board corresponding to the electrochemical ammonia sensor is set as a hollow structure to facilitate gas exchange and minimize the impact of the structural design on the response time of the electrochemical ammonia sensor.

[0017] Preferably, the housing further includes a front shell disposed opposite to the bottom shell and a side surround housing located between the bottom shell and the front shell. The indicator light is located at a certain position on the side surround housing. The ammonia sensor is an electrochemical ammonia sensor, and the air inlet on the electrochemical ammonia sensor faces the indicator light or is opposite to the indicator light. The gas detection device of this solution is suitable for side wall installation. Specifically, since the electrochemical ammonia sensor contains internal electrolyte or generates liquid after reaction, to ensure the normal use of the sensor without leakage, the air inlet of the sensor needs to be arranged upward. Based on this, when the mounting bracket is installed on the indoor side wall through bolts, and then the bottom shell is connected to the mounting bracket through snaps or bolts to achieve the side wall installation of the gas detection device, the indicator light at the side surround housing can be used as a reference. If the air inlet on the electrochemical ammonia sensor faces the indicator light, during the side wall installation process, the indicator light is installed in an upward orientation (that is, after the gas detection device is installed on the side wall, the indicator light is upward), so as to ensure that the air inlet of the sensor is arranged upward. If the air inlet on the electrochemical ammonia sensor is opposite to the indicator light, during the side wall installation process, the indicator light is installed in a downward orientation (that is, after the gas detection device is installed on the side wall, the indicator light is downward), so as to ensure that the air inlet of the sensor is arranged upward.

[0018] Preferably, the housing includes a bottom shell and a front shell disposed opposite to each other and a side surround housing located between the bottom shell and the front shell. The data interface includes a side surround interface and a bottom shell interface. The side surround interface is disposed on the side surround housing, and the bottom shell interface is disposed on the bottom shell. Both the side surround interface and the bottom shell interface can be connected to the fresh air device through wires. Based on this, during the detection process of the gas detection device (for example, factory inspection), power supply and data transmission can be provided to the gas detection device by connecting wires to the side surround interface, which is convenient for detecting the gas detection device. During the actual use process of the user, power supply and data transmission can be provided to the gas detection device by connecting wires to the bottom shell interface. In this way, the requirement of hidden design can be met and the appearance effect can be improved.

[0019] Preferably, the housing includes a bottom shell and a front shell disposed opposite to each other, and the air inlet holes are distributed on the front shell. In this way, through the air inlet holes on the front shell, the air circulation and exchange between the inside and outside of the housing can be significantly improved, ensuring that the sensor can quickly respond to the concentration change of the external gas to be detected and shortening the response time.

[0020] Preferably, the ammonia sensor is a semiconductor ammonia sensor. In this way, the ammonia sensor has the advantages of long service life, small attenuation rate, fast response speed, etc.

[0021] Preferably, the housing includes a bottom case and an upper case, and the bottom case and the upper case are connected by bolts or buckles. In this way, it is convenient to install and disassemble the bottom case and the upper case, and thus it is convenient for the actual installation and production of the gas detection device.

[0022] The beneficial effects of the present utility model are as follows:

[0023] It has the characteristics of simple structure, convenient production, being able to monitor ammonia in toilet and bathroom places in real time, and meeting the actual scene use requirements; among them, the ammonia sensor is used to detect the ammonia concentration in the air, the control circuit board is used to receive and process the data detected by the ammonia sensor, and the indicator light is used to feedback the working condition identification of the gas detection device. For example, when the gas detection device is working normally and the ammonia concentration is not exceeding the standard, the indicator light flashes at a set frequency; when the ammonia sensor monitors that the ammonia concentration exceeds the standard, the indicator light is always on; when the control circuit board detects that the ammonia sensor is in a faulty and abnormal working state, the indicator light is always on. Description of the Drawings

[0024] Figure 1 is a three-dimensional structure schematic diagram of a certain perspective of the gas detection device of the present utility model.

[0025] Figure 2 is a three-dimensional structure schematic diagram of another perspective of the gas detection device of the present utility model.

[0026] Figure 3 is a three-dimensional structure schematic diagram of an implementation manner after the upper case of the gas detection device of the present utility model is hidden.

[0027] Figure 4 is a three-dimensional structure schematic diagram of another implementation manner after the upper case of the gas detection device of the present utility model is hidden.

[0028] Figure 5 is a three-dimensional structure schematic diagram of a third implementation manner after the upper case of the gas detection device of the present utility model is hidden.

[0029] In the figure:

[0030] Housing 1, upper case 1.0, face shell 1.1, side enclosure housing 1.2, bottom case 1.3;

[0031] Air inlet hole 2;

[0032] Indicator light 3;

[0033] Data interface 4, side enclosure interface 4.1, bottom case interface 4.2;

[0034] Mounting bracket 5;

[0035] Control circuit board 6, main control board 6.1, sensor circuit board 6.2;

[0036] Ammonia sensor 7, semiconductor ammonia sensor 7.1, electrochemical ammonia sensor 7.2. Specific implementation mode

[0037] Specific embodiment 1, as Figure 1 、 Figure 2 、 Figure 3 shown, a gas detection device includes: a housing 1, a control circuit board 6, an ammonia sensor 7, an indicator light 3, and a data interface 4.

[0038] The housing 1 is provided with a plurality of air inlet holes 2 communicating with the inner cavity of the housing 1.

[0039] The control circuit board 6 is arranged inside the housing 1.

[0040] The ammonia sensor 7 is used to detect the ammonia concentration in the air. The ammonia sensor 7 is located inside the inner cavity of the housing 1. The ammonia sensor 7 is electrically connected to the control circuit board 6.

[0041] The indicator light 3 is electrically connected to the control circuit board 6. The indicator light 3 is used to indicate whether the gas detection device is working normally or whether the ammonia concentration exceeds the standard.

[0042] The data interface 4 is arranged on the housing 1, and the data interface 4 is electrically connected to the control circuit board 6. The data interface 4 can provide power supply and / or data transmission for the gas detection device. Specifically, the data interface 4 is an interface that can provide power supply and / or data transmission for the gas detection device. In this embodiment, the data interface 4 is an interface that can provide power supply and data transmission for the gas detection device.

[0043] The specific operation of the gas detection device in this embodiment is as follows. The ammonia sensor 7 is used to detect the ammonia concentration content in the air. The control circuit board 6 is used to receive and process the data detected by the ammonia sensor 7. The indicator light 3 is used to feedback the working condition identification of the gas detection device. For example, when the gas detection device is working normally and the ammonia concentration does not exceed the standard, the indicator light 3 flashes at a set frequency (for example, the indicator light 3 flashes once every 2 seconds and stays on for 1 second; of course, the indicator light 3 can also flash at a set frequency as a reminder). When the ammonia sensor 7 detects that the ammonia concentration content exceeds the standard (for example, when the ammonia concentration exceeds 1.5 ppm) or the control circuit board 6 detects that the ammonia sensor 7 is in a faulty non-normal working state, the indicator light 3 stays on (for example, the red light stays on); the gas detection device can also send an alarm signal and sound through a wire connecting the data interface 4 to an external display screen. Of course, if necessary, a buzzer can also be added inside the housing 1 for sound alarm after ammonia exceeds the standard.

[0044] On the other hand, since the data interface 4 can provide an interface for transmitting data to the gas detection device, the data interface 4 can be connected to the fresh air equipment in the room through a wire. When the ammonia sensor 7 detects that the ammonia concentration exceeds the standard, the control circuit board 6 can send a signal to the controller of the fresh air equipment for ventilation or circulation processing. The gas detection device of this embodiment has a simple structure and is easy to manufacture, can monitor the ammonia in the toilet and bathroom in real time, and meets the actual scenario usage requirements.

[0045] Specifically, as Figure 1 , Figure 2 , Figure 3 shown, the housing 1 includes a bottom case 1.3 and an upper case 1.0, and the bottom case 1.3 and the upper case 1.0 are connected by bolts or buckles. In this embodiment, the bottom case 1.3 and the upper case 1.0 are connected by bolts. In this way, it is convenient for the installation and disassembly of the bottom case 1.3 and the upper case 1.0, and further convenient for the actual installation of other components inside the housing 1. The upper case 1.0 includes a front case 1.1 and a side enclosure 1.2 integrally formed with the front case 1.1. The front case 1.1 and the bottom case 1.3 are distributed oppositely. The side enclosure 1.2 is located between the bottom case 1.3 and the front case 1.1.

[0046] The control circuit board 6 is installed on the bottom case 1.3. Specifically, the control circuit board 6 is installed on the bottom case 1.3 by bolts.

[0047] An indicating hole is provided on the side enclosure 1.2, and the indicator light 3 is located inside the housing 1 close to the indicating hole or the indicator light 3 is located in the indicating hole.

[0048] In this embodiment, the air inlet holes 2 are distributed on the front case 1.1. In this embodiment, the air inlet holes 2 are evenly distributed on the front case 1.1. In this way, through the air inlet holes 2 on the front case 1.1, the air circulation and exchange between the inside and outside of the housing 1 can be significantly improved, ensuring that the sensor can quickly respond to the concentration change of the external gas to be detected and shortening the response time.

[0049] Of course, it should be noted that the air inlet holes 2 can also be distributed on the side enclosure 1.2, or the air inlet holes 2 can also be distributed on both the front case 1.1 and the side enclosure 1.2.

[0050] Furthermore, as Figure 2As shown in the figure, a gas detection device further includes a mounting bracket 5. The mounting bracket 5 is provided with mounting holes. The bottom case 1.3 is connected to the mounting bracket 5 by snap fasteners or bolts. In this embodiment, the bottom case 1.3 is connected to the mounting bracket 5 by snap fasteners. The gas detection device of this embodiment is suitable for ceiling mounting or side wall mounting, and the installation is convenient. For example, the mounting bracket 5 is installed on the indoor top wall by bolts, and then the bottom case 1.3 is connected to the mounting bracket 5 by snap fasteners or bolts, so as to realize the ceiling mounting of the gas detection device; or the mounting bracket 5 is installed on the indoor side wall by bolts, and then the bottom case 1.3 is connected to the mounting bracket 5 by snap fasteners or bolts, so as to realize the side wall mounting of the gas detection device.

[0051] Further, as Figure 1 、 Figure 2 shown, the data interface 4 includes a side enclosure interface 4.1 and a bottom case interface 4.2. The side enclosure interface 4.1 is arranged on the side enclosure housing 1.2, and the bottom case interface 4.2 is arranged on the bottom case 1.3. Both the side enclosure interface 4.1 and the bottom case interface 4.2 can be connected to the fresh air equipment through wires. In this embodiment, both the side enclosure interface 4.1 and the bottom case interface 4.2 are interfaces that can provide power supply and data transmission for the gas detection device. Based on this, during the detection process of the gas detection device (for example, factory inspection), power supply and data transmission can be provided for the gas detection device by connecting through a wire to the side enclosure interface 4.1, so as to facilitate the detection of the gas detection device. During the actual use process of the user, power supply and data transmission can be provided for the gas detection device by connecting through a wire to the bottom case interface 4.2. In this way, the hidden design requirement can be met and the appearance effect can be improved.

[0052] In one implementation manner of this embodiment, as Figure 3 shown, the ammonia sensor 7 is a semiconductor ammonia sensor 7.1. When the required accuracy is low, the semiconductor ammonia sensor 7.1 can be selected as the ammonia sensor 7. The semiconductor ammonia sensor 7.1 has the advantages of long service life, small attenuation rate, and fast response speed. In addition, there is no electrolyte in the semiconductor ammonia sensor 7.1, so the layout direction of the air inlet of the semiconductor ammonia sensor 7.1 does not need to be considered.

[0053] In the second implementation manner of this embodiment, as Figure 4 shown, the ammonia sensor 7 is an electrochemical ammonia sensor 7.2. When the required detection accuracy is high, the electrochemical ammonia sensor 7.2 can be selected. The electrochemical ammonia sensor 7.2 has the advantages of high detection accuracy, low power consumption, high resolution, and low detection limit.

[0054] In the third implementation manner of this embodiment, as Figure 5 shown, the ammonia sensor 7 includes an electrochemical ammonia sensor 7.2 and a semiconductor ammonia sensor 7.1.

[0055] Specific Embodiment 2. The rest of the structure of this embodiment refers to Specific Embodiment 1, and the difference lies in that

[0056] In this embodiment, as Figure 4 shown, the ammonia sensor 7 is an electrochemical ammonia sensor 7.2, and the air inlet on this electrochemical ammonia sensor 7.2 faces the bottom case 1.3. The gas detection device of this embodiment is suitable for ceiling mounting. Specifically, since the electrochemical ammonia sensor 7.2 contains electrolyte inside or generates liquid after reaction, to ensure the normal use of the sensor and prevent liquid leakage, the air inlet of the sensor needs to be arranged upward. Based on this, when the mounting bracket 5 is installed on the indoor ceiling through bolts, and then the bottom case 1.3 is connected to the mounting bracket 5 through snaps or bolts to achieve the ceiling mounting of the gas detection device, since the air inlet on the electrochemical ammonia sensor 7.2 faces the bottom case 1.3, it can ensure that the air inlet of the sensor is arranged upward and ensure the normal operation of the electrochemical ammonia sensor 7.2. On the other hand, setting the ammonia sensor 7 in this solution as the electrochemical ammonia sensor 7.2 also has the advantages of high detection accuracy, low power consumption, high resolution, and low detection limit.

[0057] Furthermore, as Figure 4 shown, the control circuit board 6 includes a main control board 6.1 installed on the bottom case 1.3 and a sensor circuit board 6.2 electrically connected to the main control board 6.1. In this embodiment, the sensor circuit board 6.2 is connected to the main control board 6.1 through pin pins. The pin pins can not only be used as conductors for electrically connecting the sensor circuit board 6.2 and the main control board 6.1, but also as support components for electrically connecting the sensor circuit board 6.2 and the main control board 6.1. The sensor circuit board 6.2 is located between the main control board 6.1 and the front case 1.1. A receiving space for accommodating the electrochemical ammonia sensor 7.2 is formed between the sensor circuit board 6.2 and the main control board 6.1. The electrochemical ammonia sensor 7.2 is installed on the sensor circuit board 6.2 and is electrically connected to the sensor circuit board 6.2. The electrochemical ammonia sensor 7.2 is located between the sensor circuit board 6.2 and the main control board 6.1. In this way, on the one hand, it can electrically connect the electrochemical ammonia sensor 7.2 and the main control board 6.1; on the other hand, it can make the air inlet of the electrochemical ammonia sensor 7.2 face the bottom case 1.3, and the structure is simple and easy to manufacture.

[0058] Furthermore, as Figure 4As shown, the part of the main control board 6.1 corresponding to the electrochemical ammonia sensor 7.2 is set as a hollow structure 6.3. In order to further ensure the stability of the air intake channel of the electrochemical ammonia sensor 7.2, the part of the main control board 6.1 corresponding to the electrochemical ammonia sensor 7.2 is set as a hollow structure to facilitate gas exchange and minimize the impact of the structural design on the response time of the electrochemical ammonia sensor 7.2.

[0059] Specific Embodiment 3. The rest of the structure of this embodiment refers to Specific Embodiment 1, and the difference lies in that

[0060] In this embodiment, the indicator light 3 is located at a certain position on the side wall housing 1.2 (not shown in the figure). The ammonia sensor 7 is an electrochemical ammonia sensor 7.2, and the air inlet on the electrochemical ammonia sensor 7.2 faces the indicator light 3 or faces away from the indicator light 3. The gas detection device of this embodiment is suitable for side wall installation. Specifically, since the electrochemical ammonia sensor 7.2 contains internal electrolyte or generates liquid after reaction, to ensure the normal use of the sensor and prevent liquid leakage, the air inlet of the sensor needs to be arranged upward; based on this, when the mounting bracket 5 is installed on the indoor side wall through bolts, and then the bottom case 1.3 is connected to the mounting bracket 5 through snaps or bolts to achieve the side wall installation of the gas detection device, the indicator light 3 at the side wall housing 1.2 can be used as a reference; if the air inlet on the electrochemical ammonia sensor 7.2 faces the indicator light 3, then during the side wall installation process, the indicator light 3 is installed in an upward orientation (that is, after the gas detection device is installed on the side wall, the indicator light 3 is upward), so as to ensure that the air inlet of the sensor is arranged upward; if the air inlet on the electrochemical ammonia sensor 7.2 faces away from the indicator light 3, then during the side wall installation process, the indicator light 3 is installed in a downward orientation (that is, after the gas detection device is installed on the side wall, the indicator light 3 is downward), so as to ensure that the air inlet of the sensor is arranged upward.

[0061] Specific Embodiment 4. The rest of the structure of this embodiment refers to Specific Embodiment 1, and the difference lies in that

[0062] In this embodiment, the ammonia sensor 7 is an electrochemical ammonia sensor 7.2, and the air inlet on the electrochemical ammonia sensor faces the front shell (not shown in the figure). The gas detection device of this embodiment is suitable for installation with the front shell 1.1 facing upward. For example, the mounting bracket 5 is installed on the indoor step surface (such as a window sill) through bolts, and then the bottom case 1.3 is connected to the mounting bracket 5 through snaps or bolts to achieve the installation of the gas detection device, so as to ensure that the air inlet of the sensor is arranged upward.

[0063] The above are only the preferred embodiments of the present utility model, and do not impose any limitations on the present utility model. Any simple modifications, changes, and equivalent transformations made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A gas detection device, characterized in that: include: The outer shell is provided with a plurality of air inlet holes communicating with the inner cavity of the outer shell; A control circuit board is arranged in the housing; An ammonia sensor for detecting ammonia concentration in the air, which is located in the inner cavity of the housing, and the ammonia sensor is electrically connected to the control circuit board; An indicator light, electrically connected to the control circuit board; The data interface is arranged on the housing and is electrically connected to the control circuit board, and can provide power supply and / or data transmission for the gas detection device.

2. The gas detection device according to claim 1, characterized in that: It also includes a mounting bracket, which is provided with a mounting hole. The outer shell includes a bottom shell, which is connected to the mounting bracket through buckles or bolts.

3. The gas detection device according to claim 2, characterized in that: The ammonia sensor is an electrochemical ammonia sensor, and the air inlet on the electrochemical ammonia sensor faces the bottom shell.

4. The gas detection device according to claim 3, characterized in that: The control circuit board includes a main control board installed on the bottom shell and a sensor circuit board electrically connected to the main control board. The sensor circuit board is located between the main control board and the surface shell. The electrochemical ammonia sensor is installed on the sensor circuit board, and the electrochemical ammonia sensor is located between the sensor circuit board and the main control board.

5. The gas detection device according to claim 4, characterized in that: The portion of the main control board corresponding to the electrochemical ammonia sensor is set as a hollow structure.

6. The gas detection device according to claim 2, characterized in that the housing It also includes a face shell distributed opposite to the bottom shell and a side shell located between the bottom shell and the face shell. The indicator light is located somewhere on the side shell. The ammonia sensor is an electrochemical ammonia sensor, and the air inlet on the electrochemical ammonia sensor faces the indicator light or faces away from the indicator light.

7. The gas detection device according to claim 1, characterized in that: The outer shell includes a relatively distributed bottom shell and a front shell and a side enclosure shell located between the bottom shell and the front shell. The data interface includes a side enclosure interface and a bottom shell interface. The side enclosure interface is arranged on the side enclosure shell, and the bottom shell interface is arranged on the bottom shell. Both the side enclosure interface and the bottom shell interface can be connected to the fresh air equipment through wires.

8. The gas detection device according to claim 1, characterized in that: The outer shell comprises a bottom shell and a surface shell which are relatively distributed, and the air inlet holes are distributed on the surface shell.

9. The gas detection device according to claim 1 or 2, characterized in that: The ammonia sensor is a semiconductor ammonia sensor.

10. The gas detection device according to claim 1, characterized in that: The shell comprises a bottom shell and an upper shell, and the bottom shell and the upper shell are connected by bolts or buckles.

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