A closed gas path design method for a sensor array and a closed gas path

Abstract

The present invention relates to a closed gas path design method for a sensor array, which comprises the following steps: 1. setting a sealing box with a cavity structure inside; 2. setting a plurality of sealed cavities in the sealing box, the sealed cavities being used to encapsulate gas sensors, and the plurality of sealed cavities being arranged in an array structure; 3. opening an air inlet and an air outlet on each sealed cavity, the symmetry center of the air inlet and the air outlet on each sealed cavity being the geometric center of the sealed cavity where the air inlet and the air outlet are located; 4. linearly connecting the plurality of sealed cavities in sequence, wherein the air outlet of the preceding sealed cavity in two connected sealed cavities is connected with the air inlet of the succeeding sealed cavity; the present invention improves the flexibility of the overall size of the sensor array through the design of a zigzag airway, enables the gas sensor in each sealed cavity to fully contact the measured gas passing through the sealed cavity, and improves the detection sensitivity and consistency of the gas sensor in each sealed cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection sensor design, and in particular to a closed gas path design method and a closed gas path of a sensor array. Background Art

[0002] The gas path of traditional all-in-one sensors is relatively simple, and often there is no special gas path design, that is, the gas sensor is inserted into the device, and the all-in-one shell forms a relatively closed chamber. When the device is working, the detected gas needs to be gradually inhaled into the entire device chamber and mixed with the internal gas to be detected by the chemical gas sensor. Such a design often causes the internal volume to be too large, making the all-in-one device perform poorly for scenarios that require a quick response. In order to improve the above problems, the main design idea is to reduce the internal volume of the device, and design a clear airflow direction to reduce the diffusion effect of chemical gases in the airflow in the device, improve the response speed and consistency, especially when the positions of multiple sensors in the device can be interchangeable, the airflow equivalence of each position is particularly important.

[0003] The traditional improvement method is to divide each sensor with a partition, while reducing the volume of each independent area, and each partition has an opening at the center line of the arrangement on the side close to the top of the sensor, so that the airflow enters the next unit evenly from the hole. When the chemical sensors are arranged in a straight line, the airflow flows through each sensor in turn, and the flow field formed is very uniform, which has good effects, such as Figure 5 As shown in the figure, the dotted line indicates the airflow direction. However, when there are many sensors, arranging them in a straight line often makes the device size unreasonable and inconvenient to use. Therefore, the sensors need to be arranged in multiple rows and columns, such as Figure 4 As shown. If this type of sensor still uses the form of separating each sensor and opening a hole in the middle, the airflow will not be able to fully cover the sensor surface when crossing the row, thereby reducing the apparent performance of the sensor. In particular, when using a chemical sensor with an intermediate layer, the all-in-one device supports the random insertion of different types of sensors into the slots. Therefore, it is required that after the slots are inserted and the hatch is closed, multiple sensor positions have almost completely consistent airflow conditions, so that the sensor module does not need to consider the impact of specific positions on sensitivity. The common solution is to reconstruct the bending air path in the outer frame part when the airflow needs to cross rows, such as Figure 4 However, this structure often increases the size and volume of the device, and requires additional structures to ensure reliable and airtight connection of the external gas path, and increases the volume of the total gas chamber. If the bent gas path of the outer frame is not used, it may cause the following Figure 3 The problem shown is that the airflow often cannot fully cover the sensor surface when crossing the row, resulting in a decrease in the actual sensitivity of the sensor or a decrease in the response speed. Summary of the invention

[0004] In order to solve the technical problem that in the traditional all-in-one sensor gas path, the airflow cannot fully cover the sensor surface when crossing the rows, thereby reducing the apparent performance of the sensor, the present invention provides a closed gas path design method and a closed gas path of a sensor array.

[0005] The technical solution of the present invention to solve the above technical problem is as follows: A closed gas path design method for a sensor array comprises the following steps:

[0006] Step 1: Setting a sealing box with a cavity structure inside;

[0007] Step 2: a plurality of sealed cavities are provided in the sealed box, wherein the sealed cavities are used to encapsulate the gas sensor, and the plurality of sealed cavities are arranged in an array structure;

[0008] Step 3: Open an air inlet and an air outlet on each of the sealed cavities, wherein the symmetry center of the air inlet and the air outlet on each of the sealed cavities is the geometric center of the sealed cavity where the air inlet and the air outlet are located;

[0009] Step 4: connect the multiple sealed cavities linearly in sequence, and in two connected sealed cavities, the air outlet of the previous sealed cavity is connected to the air inlet of the next sealed cavity.

[0010] The beneficial effects of the present invention are as follows: the air inlet and the air outlet of the sealed cavity are designed symmetrically relative to the symmetry center of the sealed cavity, and the gas sensor is installed in the sealed cavity. When the measured gas passes through each sealed cavity, the airflow of the measured gas in each sealed cavity can pass through the center of the sealed cavity, so that the gas sensor in each sealed cavity can fully contact the measured gas passing through the sealed cavity, thereby improving the detection sensitivity and consistency of the gas sensor in each sealed cavity.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the step 2 is specifically as follows: the cross section of each of the sealed cavities is rectangular;

[0013] Specifically, the step three is that the air inlet and the air outlet on each of the sealed cavities are distributed at two ends of a diagonal line of the sealed cavity where the air inlet and the air outlet are located.

[0014] Further, the method further comprises step 5, providing a gas inlet and a gas outlet on the sealing box, wherein the gas inlet is connected to the gas inlet of the sealing cavity at the head end, and the gas outlet is connected to the gas outlet of the sealing cavity at the tail end;

[0015] The step 1 specifically includes setting the inner cavity cross-section of the sealing box to a rectangular shape;

[0016] The step 2 specifically comprises: providing a plurality of transversely arranged longitudinal partitions in the sealing box; the plurality of sealed cavities are formed by dividing the inner cavity of the sealing box by the plurality of longitudinal partitions; and the plurality of sealed cavities are arranged in a single row.

[0017] The beneficial effect of adopting the above further scheme is that by using partitions to divide the inner cavity of a sealed box to obtain multiple sealed cavities, the structure of each sealed cavity can be made more compact. At the same time, the volume of the sealed cavity can be controlled as needed. Under the condition that the gas sensor can effectively detect the gas to be measured, the internal volume of the equipment is minimized, and the volume of the entire equipment is effectively reduced.

[0018] Furthermore, the step four is specifically as follows: a transverse through hole in the shape of a through hole is opened on each of the longitudinal partitions, and in the two adjacent sealed cavities connected to each other, the air outlet of the previous sealed cavity is connected with the air inlet of the next sealed cavity 1 through the transverse through hole.

[0019] The beneficial effect of adopting the above further scheme is that by arranging a transverse through hole on the partition, the transverse through hole is made to be both the air inlet of the sealed cavity on one side of the longitudinal partition and the air outlet of the sealed cavity on the other side of the longitudinal partition. Therefore, the gas circulation between the middle sealed cavities can be achieved only through the transverse through hole arranged on the longitudinal partition, thereby reducing the manufacturing cost of the entire equipment and improving economy.

[0020] Further, the method further comprises step 5, providing a gas inlet and a gas outlet on the sealing box, wherein the gas inlet is connected to the gas inlet of the sealing cavity at the head end, and the gas outlet is connected to the gas outlet of the sealing cavity at the tail end;

[0021] The step 1 specifically includes setting the inner cavity cross-section of the sealing box to a rectangular shape;

[0022] Specifically, the step 2 comprises arranging the plurality of sealed cavities into a rectangular array of multiple rows and columns, providing a plurality of transversely arranged longitudinal partitions and a plurality of longitudinally arranged transverse partitions in the sealed box, wherein the plurality of transverse partitions divide the inner cavity of the sealed box into multiple rows, and the plurality of sealed cavities in each row are separated by a plurality of longitudinal partitions.

[0023] The beneficial effect of adopting the above-mentioned further scheme is that, however, when there are many sensors, the straight-line arrangement often makes the device's overall dimensions too long and makes the entire sensor device difficult to use on specific equipment. In order to consider the shape of the entire device, the sensors need to be arranged in the form of multiple rows and columns. Therefore, the design of multiple rows and columns of sealed cavities can improve the compactness of the entire sensor device and prevent the device from being too large in one direction.

[0024] Further, the step 4 is specifically as follows:

[0025] Each of the longitudinal partitions in the same row is provided with a through-hole-shaped transverse through hole, and in two adjacent sealed cavities in the same row, the air outlet of the previous sealed cavity is connected to the air inlet of the next sealed cavity 1 through the transverse through hole;

[0026] A longitudinal through hole in the form of a through hole is provided on each of the transverse partitions. In two adjacent sealed cavities connected in different rows, the air outlet of the former sealed cavity is connected with the air inlet of the latter sealed cavity through the longitudinal through hole.

[0027] The beneficial effect of adopting the above-mentioned further scheme is that by arranging a transverse through hole on the partition, the transverse through hole is made to be both the air inlet of the sealed cavity on one side of the longitudinal partition and the air outlet of the sealed cavity on the other side of the longitudinal partition. Therefore, the gas circulation between the middle sealed cavities can be achieved only through the transverse through hole arranged on the longitudinal partition, thereby reducing the manufacturing cost of the entire equipment and improving the economy; at the same time, when the airflow of the upper row is transmitted to the next row, it can also be smoothly transmitted to the sealed cavity of the next row by arranging a longitudinal through hole on the transverse partition, and the measured gas can pass through the center of the sealed cavity when flowing through the sealed cavity. Compared with the traditional technology, the present invention increases the contact area between the gas sensor in the sealed cavity and the measured airflow, thereby improving the measurement accuracy of the gas sensor in the sealed cavity.

[0028] A closed gas path of a sensor array comprises a sealing box with an internal cavity structure, wherein a sealed cavity for encapsulating a gas sensor is arranged in the sealing box, an air inlet and an air outlet are provided on the sealed cavity, and the center of symmetry between the air inlet and the air outlet on the sealed cavity is the geometric center of the sealed cavity where the air inlet and the air outlet are located; there are multiple sealed cavities, the multiple sealed cavities are arranged in an array structure, the multiple sealed cavities are linearly connected in sequence, and in two connected sealed cavities, the air outlet of the previous sealed cavity is connected to the air inlet of the next sealed cavity.

[0029] Furthermore, the sealed cavity has a rectangular cross section, and the air inlet and the air outlet on each sealed cavity are distributed at two ends of a diagonal line of the sealed cavity where the air inlet and the air outlet are located.

[0030] Furthermore, the inner cavity of the sealing box has a rectangular cross-section, and a plurality of transversely arranged longitudinal partitions are provided in the sealing box, and a plurality of the sealing cavities are formed by dividing the inner cavity of the sealing box by the plurality of longitudinal partitions, and the plurality of the sealing cavities are arranged in a single row; a gas inlet and a gas exhaust port are provided on the sealing box, the gas inlet is communicated with the gas inlet of the sealing cavity at the head end, and the gas exhaust port is communicated with the gas outlet of the sealing cavity at the tail end;

[0031] Each of the longitudinal partitions is provided with a transverse through hole in the form of a through hole. In two adjacent connected sealed cavities, the air outlet of the previous sealed cavity is connected with the air inlet of the next sealed cavity 1 through the transverse through hole.

[0032] Furthermore, the inner cavity of the sealed box has a rectangular cross section, and the plurality of sealed cavities are arranged in a rectangular array of multiple rows and columns. The sealed box is provided with a plurality of transversely arranged longitudinal partitions and a plurality of longitudinally arranged transverse partitions, and the plurality of transverse partitions divide the inner cavity of the sealed box into a plurality of rows, and the plurality of sealed cavities in each row are separated by a plurality of longitudinal partitions;

[0033] A through-hole-shaped transverse through hole is provided on each of the longitudinal partitions in the same row. In two adjacent sealed cavities connected in the same row, the air outlet of the previous sealed cavity is connected with the air inlet of the next sealed cavity 1 through the transverse through hole; a through-hole-shaped longitudinal through hole is provided on each of the transverse partitions. In two adjacent sealed cavities connected in different rows, the air outlet of the previous sealed cavity is connected with the air inlet of the next sealed cavity through the longitudinal through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0035] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0036] Figure 3 The structure of the prior art is shown in FIG. Figure 1 ;

[0037] Figure 4 The structure of the prior art is shown in FIG. Figure 2 ;

[0038] Figure 5The structure of the prior art is shown in FIG. Figure 3 .

[0039] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0040] 1. Sealed cavity; 2. Air inlet; 3. Gas sensor; 4. Air outlet; 5. Gas channel. DETAILED DESCRIPTION

[0041] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0042] like Figure 1 As shown, this embodiment provides a closed gas path design method and a closed gas path of a sensor array, and its specific design scheme is as follows:

[0043] A sealing box with an internal rectangular cavity structure is provided, and a plurality of sealed cavities 1 with square cross-sections are provided in the sealing box, wherein the sealed cavities 1 are used to encapsulate a gas sensor 3; the plurality of sealed cavities 1 are arranged in an array structure; an air inlet 2 and an air outlet 4 are provided on each sealed cavity 1, wherein the air inlet 2 and the air outlet 4 on each sealed cavity 1 are distributed at both ends of a diagonal of the sealed cavity 1 where the air inlet 2 and the air outlet 4 are located; the plurality of sealed cavities 1 are linearly connected in sequence, and in two connected sealed cavities 1, the air outlet 4 of the preceding sealed cavity 1 is connected with the air inlet 2 of the succeeding sealed cavity 1.

[0044] By setting the cross-section of the sealed cavity 1 to a square structure, and setting the air inlet 2 and the air outlet 4 of the sealed cavity 1 diagonally, the flow trajectory of the measured gas is a zigzag type, and the gas sensor 3 is installed in the sealed cavity 1. When the measured gas passes through each sealed cavity 1, the airflow of the measured gas in each sealed cavity 1 can pass through the center of the sealed cavity 1, so that the gas sensor 3 in each sealed cavity 1 can fully contact with the measured gas passing through the sealed cavity 1, thereby improving the detection sensitivity of the gas sensor 3 in each sealed cavity 1.

[0045] Specifically, Figure 2 As shown, the specific method of setting up multiple sealed cavities 1 with square cross-sections is to divide the inner cavity of the sealed box into three sealed cavities 1 by two longitudinal partitions, and the three sealed cavities 1 are arranged in a single row, and a horizontal through hole in the shape of a through hole is opened on each longitudinal partition.

[0046] By using partitions to separate the inner cavity of a sealed box to obtain three sealed cavities 1, the structure of each sealed cavity 1 can be made more compact. At the same time, the volume of the sealed cavity 1 can be controlled as needed. Under the condition that the gas sensor 3 can effectively detect the gas to be measured, the internal volume of the device can be minimized, and the volume of the entire device can be effectively reduced.

[0047] Specifically, a gas inlet and a gas exhaust port are provided on the sealing box, and the two longitudinal partitions are named as the first longitudinal partition and the second longitudinal partition from right to left, and the three sealed chambers 1 are named as the first sealed chamber, the second sealed chamber and the third sealed chamber from right to left; the air inlet 2 of the first sealed chamber and the gas inlet on the sealing box are a hole, the air outlet 4 of the first sealed chamber and the air inlet 2 of the second sealed chamber and the transverse through hole on the first longitudinal partition are a hole, the air outlet 4 of the second sealed chamber and the air inlet 2 of the third sealed chamber and the transverse through hole on the second longitudinal partition are a hole, and the air outlet of the third sealed chamber and the gas exhaust port on the sealing box are a hole.

[0048] By arranging a transverse through hole on the partition, the transverse through hole is made to be both the air inlet 2 of the sealed cavity 1 on one side of the longitudinal partition and the air outlet 4 of the sealed cavity 1 on the other side of the longitudinal partition. Therefore, the gas flow between the middle sealed cavities 1 can be achieved only through the transverse through hole arranged on the longitudinal partition, thereby reducing the manufacturing cost of the entire equipment and improving the economy.

[0049] like Figure 1 As shown, when there are many sensors, the linear arrangement often makes the device size too long and difficult to use on a specific device. The method of setting a plurality of sealed cavities 1 with square cross-sections specifically includes the following steps:

[0050] The inner cavity of the sealed box is divided into 6 sealed cavities 1 by 4 longitudinal partitions and 1 transverse partition. The inner cavity of the sealed box is divided into two upper and lower rows by 1 transverse partition. Each row is divided into 3 sealed cavities 1 by 2 longitudinal partitions. The 6 sealed cavities 1 are in a rectangular array of 2 rows and 3 columns.

[0051] Specifically, the three sealed chambers 1 in the first row are named the first sealed chamber, the second sealed chamber and the third sealed chamber from right to left, and the three sealed chambers 1 in the second row are named the fourth sealed chamber, the fifth sealed chamber and the sixth sealed chamber from left to right. Among them, the two longitudinal partitions in the upper row are named the first longitudinal partition and the second longitudinal partition from right to left, and the two longitudinal partitions in the lower row are named the third longitudinal partition and the fourth longitudinal partition from left to right.

[0052] The air inlet 2 of the first sealed cavity and the gas access port on the sealed box are a hole together, the air outlet 4 of the first sealed cavity and the air inlet 2 of the second sealed cavity and the transverse through hole on the first longitudinal partition are a hole together, the air outlet 4 of the second sealed cavity and the air inlet 2 of the third sealed cavity and the transverse through hole on the second longitudinal partition are a hole together,

[0053] The air outlet 4 of the second sealed cavity, the air inlet 2 of the third sealed cavity and the transverse through hole on the second longitudinal partition are one hole together, the air outlet 4 of the third sealed cavity, the air inlet 2 of the fourth sealed cavity and the longitudinal through hole on the transverse partition are one hole together, the air outlet 4 of the fourth sealed cavity, the air inlet 2 of the fifth sealed cavity and the transverse through hole on the third longitudinal partition are one hole together, the air outlet 4 of the fifth sealed cavity, the air inlet 2 of the sixth sealed cavity and the transverse through hole on the fourth longitudinal partition are one hole together, and the air outlet of the sixth sealed cavity and the gas discharge port on the sealing box are one hole together.

[0054] When there are many sensors, arranging them in a straight line will often make the device's overall dimensions too long, making it difficult to use on a specific device. In order to consider the shape of the entire device, the sensors need to be arranged in multiple rows and columns. Therefore, the design of a sealed cavity 1 with multiple rows and columns can improve the compactness of the entire sensor device and prevent it from being too large in a single direction.

[0055] By arranging a transverse through hole on the partition, the transverse through hole is made to be both the air inlet 2 of the sealed cavity 1 on one side of the longitudinal partition and the air outlet 4 of the sealed cavity 1 on the other side of the longitudinal partition. Therefore, the gas circulation between the middle sealed cavities 1 can be achieved only through the transverse through hole arranged on the longitudinal partition, thereby reducing the manufacturing cost of the entire equipment and improving the economy. At the same time, when the airflow of the upper row is transmitted to the next row, the longitudinal through hole is also arranged on the transverse partition, so that it can be smoothly transmitted to the sealed cavity 1 of the next row, and the measured gas can pass through the center of the sealed cavity 1 when flowing through the sealed cavity 1. Compared with the traditional technology, the present invention increases the contact area between the gas sensor 3 in the sealed cavity 1 and the measured airflow, thereby improving the measurement accuracy of the gas sensor 3 in the sealed cavity 1.

[0056] Figure 3In the prior art, when there are many sensors, the linear arrangement often makes the device size too long and difficult to use on a specific device. For the gas path design scheme that needs to consider the shape of the entire device, it is necessary to arrange the gas sensors 3 in multiple rows and columns. It is a common technical solution. The air inlet 2 and the air outlet 4 are arranged in a linear manner. The disadvantage is that when the upward airflow flows to the next row, the gas in the two sealed cavities 1 at the far left cannot fully cover the entire gas sensor 3, thereby causing the actual sensitivity of the sensor to decrease; and the airway design of the present invention can arrange the gas sensors 3 in multiple rows and columns. Even the measured gas in the sealed cavities 1 in the upper and lower rows on the left can pass through the center of the sealed cavity 1, and can completely cover the gas sensors 3 in the upper and lower rows of the sealed cavities 1.

[0057] Figure 4 In the prior art, when there are many sensors, the linear arrangement often makes the device size too long and difficult to use on a specific device. For the gas path design scheme that needs to consider the shape of the entire device, it is necessary to arrange the gas sensors 3 in multiple rows and columns. In this scheme, the air inlet 2 and the air outlet 4 are arranged in a linear manner. In order to allow the measured gas in the upper and lower rows of the sealed chambers 1 on the left to pass through the center of the sealed chamber 1, an additional gas channel 5 is required to connect the upper left sealed chamber 1 with the lower left sealed chamber 1. This design increases the cost, increases the size and volume of the device, and requires an additional structure to ensure the connection reliability and airtightness of the external gas path, and increases the volume of the total gas cavity; therefore, the technology of the present invention can solve the technical problem that the airflow in the traditional all-in-one sensor gas path cannot fully cover the sensor surface when crossing the row, thereby reducing the apparent performance of the sensor, without adding any external gas path connection, by changing the positional relationship between the air inlet 2 and the air outlet 4 of the sealed chamber 1, and without increasing any manufacturing cost.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A closed gas path design method for a sensor array, characterized in that: The following steps are included: Step 1: Setting a sealed box with a cavity structure inside; Step 2: a plurality of sealed cavities (1) are provided in the sealed box, wherein the sealed cavities (1) are used to encapsulate the gas sensor (3), and the plurality of sealed cavities (1) are arranged in an array structure; Step 3: an air inlet (2) and an air outlet (4) are provided on each of the sealed cavities (1), wherein the center of symmetry between the air inlet (2) and the air outlet (4) on each of the sealed cavities (1) is the geometric center of the sealed cavity (1) where the air inlet (2) and the air outlet (4) are located; Step 4: connecting the plurality of sealed cavities (1) linearly in sequence, wherein in two connected sealed cavities (1), the air outlet (4) of the first sealed cavity (1) is connected to the air inlet (2) of the second sealed cavity (1); Specifically, the step 2 comprises that the cross section of each of the sealed cavities (1) is rectangular; Specifically, the step three comprises that the air inlet (2) and the air outlet (4) on each of the sealed cavities (1) are distributed at two ends of a diagonal line of the sealed cavity (1) where the air inlet (2) and the air outlet (4) are located; The method further comprises step 5, providing a gas inlet and a gas outlet on the sealing box, wherein the gas inlet is connected to the gas inlet (2) of the sealing cavity (1) at the head end, and the gas outlet is connected to the gas outlet (4) of the sealing cavity (1) at the tail end; The step 1 specifically includes setting the inner cavity cross-section of the sealing box to a rectangular shape; The step 2 specifically comprises: arranging the plurality of sealed cavities (1) in a rectangular array of multiple rows and columns, providing a plurality of transversely arranged longitudinal partitions and a plurality of longitudinally arranged transverse partitions in the sealed box, wherein the plurality of transverse partitions divide the inner cavity of the sealed box into a plurality of rows, and the plurality of sealed cavities (1) in each row are separated by a plurality of longitudinal partitions.

2. The closed gas path design method of the sensor array according to claim 1, characterized in that: The step four specifically comprises: a transverse through hole in the form of a through hole is provided on each of the longitudinal partitions; in two adjacent connected sealed cavities (1), the air outlet (4) of the first sealed cavity (1) is connected to the air inlet (2) of the second sealed cavity (1) through the transverse through hole.

3. The closed gas path design method of the sensor array according to claim 1, characterized in that: The step 4 is specifically as follows: Each of the longitudinal partitions in the same row is provided with a through-hole-shaped transverse through hole, and in two adjacent sealed cavities (1) in the same row, the air outlet (4) of the first sealed cavity (1) and the air inlet (2) of the second sealed cavity (1) are connected through the transverse through hole; A longitudinal through hole in the form of a through hole is provided on each of the transverse partitions, and in two adjacent sealed cavities (1) connected in different rows, the air outlet (4) of the first sealed cavity (1) is connected to the air inlet (2) of the second sealed cavity (1) through the longitudinal through hole.

4. A closed gas path of a sensor array, characterized in that: The invention comprises a sealing box with an internal cavity structure, wherein a sealing cavity (1) for encapsulating a gas sensor (3) is arranged in the sealing box, an air inlet (2) and an air outlet (4) are provided on the sealing cavity (1), and the symmetry center of the air inlet (2) and the air outlet (4) on the sealing cavity (1) is the geometric center of the sealing cavity (1) where the air inlet (2) and the air outlet (4) are located; there are a plurality of the sealing cavities (1), the plurality of the sealing cavities (1) are arranged in an array structure, the plurality of the sealing cavities (1) are linearly connected in sequence, and in two connected sealing cavities (1), the air outlet (4) of the first sealing cavity (1) is connected to the air inlet (2) of the second sealing cavity (1); the cross section of the sealing cavity (1) is rectangular, and the air inlet (2) and the air outlet (4) on each of the sealing cavities (1) are distributed at the two ends of the diagonal of the sealing cavity (1) where the air inlet (2) and the air outlet (4) are located; The inner cavity of the sealed box has a rectangular cross section, and the plurality of sealed cavities (1) are arranged in a rectangular array of multiple rows and columns. The sealed box is provided with a plurality of transversely arranged longitudinal partitions and a plurality of longitudinally arranged transverse partitions. The plurality of transverse partitions divide the inner cavity of the sealed box into a plurality of rows, and the plurality of sealed cavities (1) in each row are separated by a plurality of longitudinal partitions. Each of the longitudinal partitions on the same row is provided with a transverse through hole in the form of a through hole. In two adjacent sealed cavities (1) connected on the same row, the air outlet (4) of the previous sealed cavity (1) is connected to the air inlet (2) of the next sealed cavity (1) through the transverse through hole; each of the transverse partitions is provided with a longitudinal through hole in the form of a through hole. In two adjacent sealed cavities (1) connected on different rows, the air outlet (4) of the previous sealed cavity (1) is connected to the air inlet (2) of the next sealed cavity (1) through the longitudinal through hole.

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