Atmospheric component detection sensor

Abstract

The invention relates to the technical field of gas detection sensors, in particular to an atmospheric composition detection sensor, an air passage is arranged in the sensor, an ionization inner space is arranged on a road through which detection gas must pass, the detection gas can not be influenced to enter and exhaust, ozone ions in the ionization inner space are exhausted along with the detection gas, and the detection gas is not influenced. The ionization effect is further improved; detection gas introduced into the gas passage can be basically ionized, so that the amount of ionized gas in the same time is larger, more positively charged ions are obtained through ionization, electric signals obtained through ionization are stronger, the response sensitivity of the sensor is high, result data accord with the actual concentration of the detected gas, and the detection result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection sensors, and in particular to an atmospheric component detection sensor. Background Art

[0002] In the field of air detection sensors, existing sensors have the following problems: 1. In order to avoid the contamination of the components in the sensor, premature degradation of the overall performance of the sensor, and baseline drift as much as possible, the same type of sensors use the relatively passive method of free diffusion of gas molecules to capture pollutant molecules. For example, the Chinese patent application with publication number CN114280246A discloses an air composition monitor that can be used in various application scenarios, in which the air composition sensor is installed on the side wall of the main airway. The gas sampled in the main airway does not actually pass through or enter the ionized inner space of the sensor to participate in the reaction. There is no airway in the sensor, and the gas molecules use the relatively passive method of free diffusion to enter the ionized inner space to participate in the reaction, which makes the sensor low in sensitivity or the result data inconsistent with the actual concentration of the measured gas.

[0003] 2. Due to the technical principle of the same type of sensors, the original parts are easily contaminated. After long-term use, it is inevitable that the internal components will be contaminated, resulting in an overall decline in sensor performance and drift in data results.

[0004] 3. The gas flow channel is not "smooth", which can easily cause gas or pollutants to stay in the airway, making it difficult to completely update the gas in the gas channel, resulting in inaccurate or slow sensor response, seriously affecting the timeliness of the data. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem that the air detection sensor in the prior art uses the relatively passive method of free diffusion of gas molecules to capture pollutant molecules. The gas sampled in the main airway does not actually all pass through or enter the ionized internal space of the sensor to participate in the reaction, resulting in low sensor sensitivity or the result data not being consistent with the actual concentration of the measured gas, and to provide an atmospheric composition detection sensor.

[0006] The present invention provides an atmospheric component detection sensor, comprising: A shell, an air passage is provided inside the shell, and an air inlet and an air outlet are provided on the shell for communicating with the inside and outside of the shell, the air inlet is connected to one end of the air passage, and the air outlet is connected to the other end of the air passage; A main control board, the main control board is arranged in the housing, and a detection circuit is provided on the main control board; An ionized inner space, the ionized inner space is arranged in the airway, and the airway is connected to both ends of the airway through the ionized inner space; A high potential electrode, the high potential electrode is disposed in the housing and is electrically connected to the detection circuit; A low potential electrode, the low potential electrode is electrically connected to the detection circuit, and when both the low potential electrode and the high potential electrode are energized, an electric potential field can be formed in the ionization inner space, and the electric potential field has a potential difference; An ultraviolet light generator is disposed in the shell and can provide ionization energy for the gas entering the ionization inner space, so that the gas molecules in the ionization inner space can be ionized.

[0007] In the atmospheric composition detection sensor of the present invention, the airway, the main control board, the high potential electrode, the low potential electrode and the ultraviolet light generator are all located in the housing of the sensor, which can form protection; the two ends of the airway are connected to the outside through the air inlet and the air outlet on the housing, respectively, so that the gas can circulate inside and outside the sensor; the ionization inner space is arranged in the airway, so that the airway is connected to the two ends of the airway through the ionization inner space, so that the gas in the airway needs to enter the ionization inner space, and the ultraviolet light generator provides ionization energy for the gas entering the ionization inner space, and the ionization inner space The air gas molecules temporarily lose electrons and become positively charged ions under the high-energy excitation of the ultraviolet light generator, so that the gas molecules in the ionization inner space can be ionized, and then all the air molecules entering the airway can be ionized to form charged particles. After the low-potential electrode and the high-potential electrode are energized, an electric potential field is formed in the ionization inner space. The electric potential field has a potential difference. Driven by the potential energy of the potential field, the charged particles quickly collide with the high-potential electrode and the low-potential electrode under the action of the potential energy, generate a current signal, and transmit it to the detection circuit on the main control board. Since the present application sets the ionization inner space on the path that the detection gas must pass through, and will not affect the entry and discharge of the detection gas, the ozone ions in the ionization inner space are discharged along with the detection gas, reducing the interference of ozone on the ionization process, thereby improving the ionization effect; and the pollutant gas molecules in the detection gas introduced into the airway can be basically ionized, thereby making the amount of ionized gas larger in the same time, the positively charged ions obtained by ionization are more, and the electrical signal obtained by ionization is stronger, so that the sensor response sensitivity is high, and the result data is consistent with the actual concentration of the gas being measured, so that the detection result is more accurate.

[0008] Preferably, it includes an ionization chamber, the ionization chamber has an ionization chamber side wall, the ionization inner space, an ionization chamber gas inlet and an ionization chamber gas outlet, the ionization inner space is located in the ionization chamber side wall, the ionization chamber side wall is at least one of the high potential electrode and the low potential electrode, the ionization chamber gas inlet connects one end of the airway close to the air inlet with the ionization inner space, and the ionization chamber gas outlet connects one end of the airway close to the air outlet with the ionization inner space.

[0009] Since the present application sets the ionization chamber on the path that the detection gas must pass through, and will not affect the entry and discharge of the detection gas, the ozone ions in the ionization space are discharged along with the detection gas, thereby improving the ionization effect; and the detection gas introduced into the airway can be basically ionized, so that the amount of ionized gas in the same time is larger, the positively charged ions obtained by ionization are more, and the electrical signal obtained by ionization is stronger, so that the sensor response sensitivity is high, and the result data is consistent with the actual concentration of the gas being measured, so that the detection quality is higher.

[0010] Preferably, the air passage is a groove-shaped structure opened on the inner surface of the shell, the notch of the groove-shaped structure faces the inside of the shell, the main control board covers the notch of the air passage, and the main control board seals the notch.

[0011] It is convenient to open the airway and install the ionization chamber in the airway. The main control board seals the groove to ensure the airtightness, so that the gas in the airway can enter the ionization space for ionization.

[0012] Preferably, the cross-sectional area difference at different longitudinal positions of the airway does not exceed ±10%.

[0013] It can ensure that the speed of gas flowing in the airway changes little, thereby improving the renewal efficiency of gas in the airway, making the performance of the same sensor product more consistent on different instruments.

[0014] Preferably, the outer contours of the cross-section and the longitudinal section of the shell are both rectangular, the air duct includes an air inlet duct, an air outlet duct and a detection air duct, the detection air duct is arranged along the width direction of the shell, the air inlet duct and the air outlet duct are both arranged along the length direction of the shell, the air inlet duct and the air outlet duct are located on the same side of the detection air duct, the air inlet duct and the air outlet duct are connected at both ends of the detection air duct, the air inlet duct is connected to the air inlet, the air outlet duct is connected to the air outlet, and the ionization chamber is arranged in the detection air duct.

[0015] This arrangement can reduce the impact of the airway arrangement on the volume of the sensor and reduce the volume of the sensor.

[0016] Preferably, the portion where the air inlet duct communicates with the detection duct adopts an arc-shaped channel, and the portion where the air outlet duct communicates with the detection duct adopts an arc-shaped channel.

[0017] The part where the air inlet airway is connected to the detection airway and the part where the air outlet airway is connected to the detection airway can both have a smooth transition, thereby reducing the possibility of gas vortexes at the angle, making the speed of the gas flowing in the airway change less, thereby improving the renewal efficiency of the gas in the airway, and making the performance of the same sensor product on different instruments more consistent.

[0018] Preferably, guide fins are provided on the inner wall of the arc-shaped channel, and the direction of the guide fins is adapted to the central axis of the arc-shaped channel.

[0019] This makes the gas flow more smoothly during large turns, improving gas renewal efficiency.

[0020] Preferably, the interior of the detection airway is a rectangular cross-section with an arc-shaped chamfer.

[0021] The cross-section of the detection airway used to set up the ionization chamber is a rectangular cross-section, which can better set up the ionization chamber and ensure the sealing performance to avoid leakage at the location where the ionization chamber is set; the four corners of the rectangular cross-section have arc-shaped guide angles to reduce the generation of eddy currents, retention, pollutant retention or dead corners, etc., which can improve the smoothness of gas flow and improve gas renewal efficiency.

[0022] Preferably, it further comprises an inner needle, the inner cross-section of the ionization chamber side wall is circular, the inner needle is arranged in the radial middle of the ionization inner space, one of the inner needle and the ionization chamber side wall is a high potential electrode and the other is a low potential electrode, and the inner needle and the ionization chamber side wall can be energized to form the electric potential field; The gas inlet of the ionization chamber is a first hole, and the gas outlet of the ionization chamber is a second hole. The first hole and the second hole are arranged on the side wall of the ionization chamber. The first hole is used to connect the airway and the ionization inner space, and the second hole is used to connect the airway and the ionization inner space.

[0023] The side wall of the ionization chamber can adopt two sheet structures, the space between the two sheet structures is the ionization inner space, and the two sheet structures have high and low potentials respectively to form a potential difference. Compared with the structure in which the side wall of the ionization chamber adopts two sheet structures to form a potential difference, this scheme adopts the side wall of the ionization chamber with a circular inner cross-section, and the inner needle is arranged in the radial middle part of the ionization inner space. The inner needle and the side wall of the ionization chamber form a potential field with a potential difference, which can detect ions in a circular direction, so that the effect of detecting ions after ionization is better, and the detection quality can be improved.

[0024] Preferably, the side wall of the ionization chamber is a high potential electrode, and the inner needle is a low potential electrode.

[0025] That is, when the power is turned on, the potential of the side wall of the ionization chamber is higher than the potential of the inner needle, so that the positively charged ions after ionization can flow to the inner needle and be captured by the inner needle to form an electrical signal. Compared with making the potential of the side wall of the ionization chamber lower than the potential of the inner needle, that is, making the positively charged ions after ionization flow to the side wall of the ionization chamber, this solution allows the positively charged ions after ionization to flow to the inner needle, and the area of ​​the inner needle is smaller than the area of ​​the side wall of the ionization chamber, thereby making the capture of the positively charged ions after ionization less disturbed, which is more conducive to ensuring the detection results.

[0026] Preferably, the inner needle is arranged in the middle of the ionization inner space.

[0027] This makes the distance between the inner needle and the side wall of the ionization chamber balanced, so that more positively charged ions can be captured after the gas is ionized, which is beneficial to improving the reaction sensitivity and accuracy.

[0028] Preferably, the ultraviolet light generator is arranged on one axial side of the ionization chamber side wall, and the end of the ionization chamber side wall provided with the ultraviolet light generator has a third hole, and the ultraviolet light generating interface of the ultraviolet light generator faces the ionization inner space through the third hole.

[0029] The ultraviolet light of the ultraviolet light generator is emitted through the ultraviolet light generating interface, enters the ionization inner space through the third hole, and then ionizes the gas molecules entering the ionization inner space.

[0030] Preferably, a sealing structure is provided between the ultraviolet light generator and the side wall of the ionization chamber.

[0031] The sealing structure is used to seal the contact position between the ultraviolet light generating interface of the ultraviolet light generator and the side wall of the ionization chamber to prevent the detection gas from overflowing from the inner space of the ionization chamber.

[0032] Preferably, it further comprises a cleaning mechanism, the cleaning mechanism comprising a first motion mechanism, a second motion mechanism and a wiping member, the first motion mechanism can drive the ultraviolet light generator to approach or move away from the side wall of the ionization chamber, and the second motion mechanism can control the wiping member to swing; After the first motion mechanism controls the ultraviolet light generator to move away from the side wall of the ionization chamber, the second motion mechanism can control the wiping member to swing and wipe the ultraviolet light generating interface of the ultraviolet light generator.

[0033] Preferably, the air outlet is connected to an air pump, and the air pump is located outside the housing. The air pump forms a negative pressure at the air outlet, so that the air in the airway is quickly updated, the air inside the airway and the external ambient air can be synchronized in real time, and the air can continuously enter the sensor for detection, ensuring the stable state of the air pressure entering the sensor, and the stable air pressure ensures that the ionization signal will not deviate from the actual pollutant concentration due to air pressure fluctuations, so that the detection quality is higher.

[0034] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an atmospheric composition detection sensor, wherein an airway is arranged in the sensor, and an ionization inner space is arranged on a path that a detection gas must pass through, and the sensor will not be affected in entering and discharging the detection gas. Ozone ions in the ionization inner space are discharged along with the detection gas, thereby reducing the interference of ozone on the ionization process, thereby improving the ionization effect; and the detection gas introduced into the airway can be basically ionized, thereby making the amount of ionized gas larger in the same time, and more positively charged ions obtained by ionization, and the electrical signal obtained by ionization is stronger. Under the condition that the background noise remains unchanged, the signal-to-noise ratio is better, thereby providing more effective detection sensitivity, and the result data is consistent with the actual concentration of the gas being measured, so that the detection result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the explosion of the atmospheric composition detection sensor of the present invention Figure 1 ; Figure 2 Schematic diagram of explosion of the atmospheric composition detection sensor of the present invention Figure 2 ; Figure 3 A schematic diagram showing that the air passage is arranged on the inner side of the shell; Figure 4 Schematic diagram of the positions of the air inlet and the air outlet; Figure 5 This is a plan view of the location of the ionization chamber in the airway; Figure 6 It is a side view schematic diagram of the setting position of the ionization chamber in the airway; Figure 7 This is a schematic diagram of the positions of the UV lamp and the ionization chamber; Figure 8 It is a schematic diagram of the position of the inner needle and the ionization chamber; Fig. 9 It is a front view schematic diagram of the side wall of the ionization chamber; Fig.10 It is a side schematic diagram of the side wall of the ionization chamber; Fig.11 The schematic diagram of the ionization chamber (viewed from above and below); Fig.12This is a three-dimensional schematic diagram of the installation of the ionization chamber; Fig.13 This is a schematic diagram of the installation side of the ionization chamber; Fig.14 This is a front view of the installation of the ionization chamber; Fig.15 for Fig.14 Sectional view at AA in the middle; Fig.16 Illustration of the work of the cleaning agency Figure 1 ; Fig.17 Illustration of the work of the cleaning agency Figure 2 ; Fig.18 Illustration of the work of the cleaning agency Figure 3 ; Fig.19 This is the working principle of the cleaning organization Figure 4 .

[0036] Markings in the figure: 1. ionization chamber; 11. ionization chamber side wall; 12. ionization inner space; 13. inner needle; 111. first hole; 112. second hole; 2. airway; 21. air inlet; 22. detection airway; 23. air outlet; 24. arc-shaped channel; 25. guide fin; 3. ultraviolet light generator; 31. ultraviolet lamp; 311. ultraviolet light generating interface; 32. ultraviolet mounting cover; 33. ultraviolet mounting hinge; 4 , main body shell; 41, main body inner wall; 42, bottom cover; 421, main control board; 422, first PCB board; 423, second PCB board; 424, first electrical connection column; 425, second electrical connection column; 426, sealing structure; 51, first motor; 52, second motor; 53, connecting rod mechanism; 54, rocker arm; 55, wiping component; 6, custom adapter plate; 71, air inlet; 72, air outlet; 8, external interface. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0038] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0039] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0040] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0041] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0042] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements. Example

[0043] like Figure 1-Figure 2 As shown, an atmospheric component detection sensor includes a shell, a main control board 421, an ionization inner space 12, a high potential electrode, a low potential electrode and an ultraviolet light generator 3. The main control board 421, the ionization inner space 12, the high potential electrode, the low potential electrode and the ultraviolet light generator 3 are all arranged in the shell to form protection.

[0044] like Figure 1 and Figure 2 As shown, the housing includes a main housing 4 and a bottom cover 42. The main housing 4 is a rectangular box structure. The main housing 4 and the bottom cover 42 are connected by a detachable connection method such as screws, which is convenient for installing the main control board 421, the ionization inner space 12, the high potential electrode, the low potential electrode and the ultraviolet light generator 3 in the housing, and is convenient for maintenance and replacement. An external interface 8 and a custom adapter board 6 are also provided on the outside of the housing. The external interface 8 serves as a data interface and is electrically connected to the main control board 421; the custom adapter board 6 can be used for conversion connection to form a docking with various circuit interfaces outside the sensor.

[0045] like Figure 3 and Figure 4 As shown, an air passage 2 is provided inside the shell, and the shell is provided with an air inlet 71 and an air outlet 72 communicating with the inside and outside of the shell, the air inlet 71 is connected to one end of the air passage 2, and the air outlet 72 is connected to the other end of the air passage 2; The main control board 421 is provided with a detection circuit, and the detection circuit can adopt a conventional circuit structure for detecting electrical signals; for example, the detection circuit includes a pre-amplifier, a main amplifier, a filter, an analog-to-digital converter ADC, and a microcontroller. The pre-amplifier is used to amplify the weak signal generated by the ionization chamber. The pre-amplifier usually has high input impedance and low noise characteristics to ensure the integrity of the signal. The transimpedance amplifier is the most commonly used type of pre-amplifier, which converts the current signal into a voltage signal and performs preliminary amplification. The main amplifier is used to further amplify the signal output by the pre-amplifier to a level that can be processed by subsequent circuits. The operational amplifier is often used as the main amplifier to provide high gain to ensure sufficient amplification of the signal. The filter is used to remove noise from the signal and improve the signal-to-noise ratio. The low-pass filter and the band-pass filter are the most commonly used filter types. The low-pass filter removes high-frequency noise, and the band-pass filter only allows signals within a specific frequency range to pass. The analog-to-digital converter ADC converts the analog signal into a digital signal, which is convenient for subsequent digital processing and analysis, and converts the amplified analog signal into a digital signal for processing by a microcontroller or computer. The microcontroller or computer is used to process and analyze the digital signal output by the ADC, record and display the data, and can communicate with the ADC through the SPI, I2C or UART interface.

[0046] The ionized inner space 12 is disposed in the airway 2, and the airway 2 is connected to both ends of the airway 2 through the ionized inner space 12; so that air enters the airway 2 through the air inlet 71 and must pass through the ionized inner space 12 before being discharged from the air outlet 72; The high potential electrode is electrically connected to the detection circuit and is capable of transmitting an electrical signal to the detection circuit; The low potential electrode is electrically connected to the detection circuit and can transmit an electrical signal to the detection circuit; when the low potential electrode and the high potential electrode are both energized, an electric potential field can be formed in the ionization inner space 12, and the electric potential field has a potential difference, thereby separating the ionized positive ions and negative electrons; The ultraviolet light generator 3 is arranged in the housing, and the ultraviolet light generator 3 can provide ionization energy for the gas entering the ionization inner space 12, so that the pollutant gas molecules can be ionized in the ionization inner space 12. The pollutant gas molecules are VOC (volatile organic compound) type pollutants, mainly VOC components in the air. The ultraviolet light generator 3 can adopt a structure such as an ultraviolet lamp 31, which can provide high energy for exciting the ionization of air molecules.

[0047] When the air enters the airway 2 from the air inlet 71, it passes through the ionization inner space 12. Under the excitation of the ultraviolet light generator 3, the air molecules are ionized to form charged particles. Driven by the electric potential energy of the electric field, the charged particles quickly collide with the high potential electrode and the low potential electrode under the action of the electric potential energy, generating a current signal, which is transmitted to the detection circuit on the main control board 421. Since the ionization inner space 12 is set on the road that the detection gas must pass through, and will not affect the entry and discharge of the detection gas, the ozone ions in the ionization inner space 12 are discharged along with the detection gas, reducing the interference of ozone on the ionization process, thereby improving the ionization effect; and the detection gas introduced into the airway 2 can be basically ionized, thereby making the amount of ionized gas larger in the same time, the positively charged ions obtained by ionization are more, the electrical signal obtained by ionization is stronger, and the signal-to-noise ratio is better when the background noise remains unchanged, thereby providing more effective detection sensitivity, and the result data is consistent with the actual concentration of the gas being measured, making the detection result more accurate.

[0048] For the above-mentioned atmospheric composition detection sensor, the ionization effect, installation convenience and sensor size are optimized as follows.

[0049] In some embodiments, the ionization inner space 12 is located in the ionization chamber 1, and the ionization chamber 1 has an ionization chamber side wall 11, the ionization inner space 12, an ionization chamber gas inlet and an ionization chamber gas outlet. The ionization inner space 12 is located in the ionization chamber side wall 11, and the ionization chamber side wall 11 is at least one of the high potential electrode and the low potential electrode. The ionization chamber gas inlet connects one end of the air channel 2 close to the air inlet 71 with the ionization inner space 12, and the ionization chamber gas outlet connects one end of the air channel 2 close to the air outlet 72 with the ionization inner space 12.

[0050] The ionization chamber 1 structure is used to form the ionization inner space 12 and the electric potential field, so that ionization and the capture of electrical signals are more convenient.

[0051] When the ionization chamber side wall 11 is composed of two opposite pieces, the space between the two pieces serves as the ionization inner space 12, and gas passes through the space at the same time, so that the gas flows from one end of the airway 2 to the other end of the airway 2. The two pieces can serve as high potential electrodes and low potential electrodes respectively, forming an electric potential field between the two pieces.

[0052] When the ion chamber side wall 11 is an integral structure, it can only serve as one of the high potential electrode and the low potential electrode. Figure 7-Figure 11 As shown, the atmospheric component detection sensor further includes an inner needle 13, the inner cross-section of the ionization chamber side wall 11 is circular, the inner needle 13 is arranged in the radial middle of the ionization inner space 12, one of the inner needle 13 and the ionization chamber side wall 11 is a high potential electrode, and the other is a low potential electrode, and the inner needle 13 and the ionization chamber side wall 11 can be energized to form the electric potential field; The gas inlet of the ionization chamber is a first hole 111, and the gas outlet of the ionization chamber is a second hole 112. The first hole 111 and the second hole 112 are arranged on the side wall 11 of the ionization chamber. The first hole 111 is used to connect the airway 2 and the ionization inner space 12, and the second hole 112 is used to connect the airway 2 and the ionization inner space 12.

[0053] Compared with the structure in which the ionization chamber side wall 11 uses two sheet structures to form a potential difference, this solution uses the ionization chamber side wall 11 with a circular inner cross-section, and sets the inner needle 13 in the radial middle of the ionization inner space 12, such as Fig.11 As shown, the inner needle 13 and the ionization chamber side wall 11 form an electric potential field with a potential difference, which can detect ions in a circular direction, so that the effect of detecting ions after ionization is better and the detection quality can be improved.

[0054] As a preferred embodiment, the side wall 11 of the ionization chamber is a high potential electrode, and the inner needle 13 is a low potential electrode. That is, when the power is turned on, the potential of the side wall 11 of the ionization chamber is higher than the potential of the inner needle 13, so that the positively charged ions after ionization can flow to the inner needle 13, and are captured by the inner needle 13 to form an electrical signal. Compared with making the potential of the side wall 11 of the ionization chamber lower than the potential of the inner needle 13, that is, allowing the positively charged ions after ionization to flow to the side wall 11 of the ionization chamber, this solution allows the positively charged ions after ionization to flow to the inner needle 13, and the area of ​​the inner needle 13 is smaller than the area of ​​the side wall 11 of the ionization chamber, thereby making the interference of the captured positively charged ions after ionization smaller, which is more conducive to ensuring the detection results.

[0055] Furthermore, the inner needle 13 is arranged in the middle of the ionization inner space 12, so that the distance between the inner needle 13 and the ionization chamber side wall 11 is balanced, thereby enabling more positively charged ions to be captured after the gas is ionized, which is beneficial to improving the reaction sensitivity and accuracy.

[0056] In order to improve the ionization effect, it is necessary to ensure that the gas pressure entering the ionization inner space 12 is in a stable state, such as Figure 5 As shown, the air outlet 72 is connected to an air pump, and the air pump is located outside the housing. Negative pressure is formed at the air outlet 72 by the air pump, so that the air in the airway 2 is quickly updated, and the air inside the airway 2 and the external ambient air can be synchronized in real time, thereby improving the sensitivity and real-time performance of the sensor detection. It can also make the gas enter the ionization inner space 12 faster, which can improve the response speed and make the detection efficiency higher; and the gas update cycle entering the ionization inner space 12 is short, which is conducive to obtaining more accurate detection results in real time. And the air can continue to enter the sensor for detection, ensuring the stable state of the air pressure entering the sensor, and the stable air pressure ensures that the ionization signal will not deviate from the actual pollutant concentration due to air pressure fluctuations, so that the detection quality is higher.

[0057] In order to improve the gas utilization rate of the ionization inner space 12 and facilitate the installation of the ionization chamber 1, the present application also optimizes the structure of the airway 2, such as Figure 7 and Figure 8 As shown, the airway 2 is a groove-shaped structure opened on the inner surface of the shell, specifically, it is arranged on the main body inner wall 41 inside the main shell 4, the notch of the groove-shaped structure faces the inside of the shell, and the main control board 421 covers the notch of the airway 2, which can be referred to Figure 2 and Figure 6The ionization chamber 1 is inserted downward into the groove structure, and the main control board 421 seals the groove to form a closed airway 2, preventing gas from overflowing the airway 2 and entering the sensor. This arrangement is convenient for opening the airway 2 and installing the ionization chamber 1 in the airway 2. The main control board 421 seals the groove to ensure the airtightness, so that the gas in the airway 2 enters the ionization inner space 12 for ionization.

[0058] In order to improve the renewal efficiency of the gas in the airway 2, the airway 2 is further optimized, and the difference in cross-sectional area at different longitudinal positions of the airway 2 does not exceed ±10%. Figure 5 As shown, it can ensure that the velocity of the gas flowing in the airway 2 changes little, thereby improving the renewal efficiency of the gas in the airway 2, so that the performance of the same sensor product on different instruments is more consistent.

[0059] In order to reduce the volume of the sensor, the airway 2 is further optimized. The outer contours of the cross section and the longitudinal section of the shell are both rectangular. The airway 2 includes an inlet airway 21, an outlet airway 23 and a detection airway 22. The detection airway 22 is arranged along the width direction of the shell. Figure 5 As shown, the air inlet duct 21 and the air outlet duct 23 are both arranged along the length direction of the shell, the air inlet duct 21 and the air outlet duct 23 are located on the same side of the detection air duct 22, the air inlet duct 21 and the air outlet duct 23 are connected to both ends of the detection air duct 22, the air inlet duct 21 is connected to the air inlet 71, the air outlet duct 23 is connected to the air outlet 72, and the ionization chamber 1 is arranged in the detection air duct 22. This arrangement can reduce the influence of the air duct 2 arrangement on the volume of the sensor and reduce the volume of the sensor.

[0060] In order to improve the renewal efficiency of the gas in the airway 2, the airway 2 is further optimized, and the portion where the inlet airway 21 and the detection airway 22 are connected adopts an arc-shaped channel 24, and the portion where the outlet airway 23 and the detection airway 22 are connected adopts an arc-shaped channel 24. This allows the portion where the inlet airway 21 and the detection airway 22 are connected and the portion where the outlet airway 23 and the detection airway 22 are connected to be able to transition smoothly, thereby reducing the possibility of gas vortices at the angle, making the speed of the gas flowing in the airway 2 change less, thereby improving the renewal efficiency of the gas in the airway 2, and making the same sensor product have higher performance consistency on different instruments.

[0061] In order to improve the renewal efficiency of the gas in the airway 2, the airway 2 is further optimized, such as Figure 5 As shown, the inner wall of the arc-shaped channel 24 is provided with a guide fin 25, and the direction of the guide fin 25 is adapted to the central axis of the arc-shaped channel 24. This makes the gas smoother when making a large turn, and improves the gas renewal efficiency.

[0062] In order to improve the gas utilization rate and renewal rate of the ionization inner space 12 and facilitate the installation of the ionization chamber 1, the air channel 2 is further optimized, and the interior of the detection air channel 22 is a rectangular cross section with an arc chamfer. The cross section of the detection air channel 22 used to set the ionization chamber 1 is a rectangular cross section, which can better set the ionization chamber 1 and ensure the sealing performance to avoid leakage at the location where the ionization chamber 1 is set; the four corners of the rectangular cross section have arc chamfers to reduce the generation of eddy currents, retention, contaminant retention or dead corners, etc., which can improve the smoothness of gas flow and improve the gas renewal efficiency.

[0063] In some embodiments, Figure 8 As shown, the ultraviolet light generator 3 is arranged on one axial side of the ionization chamber side wall 11, and the end of the ionization chamber side wall 11 provided with the ultraviolet light generator 3 has a third hole, and the ultraviolet light generating interface 311 of the ultraviolet light generator 3 passes through the third hole toward the ionization inner space 12. The ultraviolet light of the ultraviolet light generator 3 is emitted through the ultraviolet light generating interface 311, enters the ionization inner space 12 through the third hole, and then ionizes the gas molecules entering the ionization inner space 12.

[0064] In some embodiments, Fig.12 As shown, a sealing structure 426 is provided between the ultraviolet light generator 3 and the side wall 11 of the ionization chamber. The sealing structure 426 is used to seal the contact position between the ultraviolet light generating interface 311 of the ultraviolet light generator 3 and the side wall 11 of the ionization chamber to prevent the detection gas from overflowing from the ionization inner space 12. The sealing structure 426 seals the contact position between the ultraviolet light generating interface 311 of the ultraviolet light generator 3 and the side wall 11 of the ionization chamber, and can adopt direct sealing or indirect sealing, such as adopting a sealing ring. Under the premise of ensuring that the ultraviolet light of the ultraviolet light generator 3 can enter the ionization inner space 12 to excite the gas molecules, the detection gas can be prevented from overflowing from the ionization inner space 12 into the ionization inner space 12, and the gas molecules entering the airway 2 can be ionized in the ionization inner space 12 as much as possible, while preventing the gas molecules from overflowing the airway 2 into the sensor, and preventing the gas molecules from affecting other components in the sensor.

[0065] like Figure 13-Figure 15As shown, the upper end of the ionization chamber side wall 11 is embedded in the mounting hole of the first PCB board 422, and the ionization chamber side wall 11 is electrically connected to the first PCB board 422, and the lower end of the ionization chamber side wall 11 is embedded in the mounting groove of the second PCB board 423, and the ionization chamber side wall 11 and the second PCB board 423 are insulated; the inner needle 13 is located at the axis of the ionization inner space 12 in the ionization chamber side wall 11, and the lower end passes through the fourth hole of the ionization chamber side wall 11 and is fixed on the second PCB board 423, and is electrically connected to the second PCB board 423, and the second PCB board 423 blocks the fourth The main control board 421 is located above the first PCB board 422, and the first PCB board 422 and the second PCB board 423 are connected to form a whole through the first electrical connection column 424 and the second electrical connection column 425 respectively, and the first electrical connection column 424 and the second electrical connection column 425 extend to the main control board 421, the first electrical connection column 424 electrically connects the first PCB board 422 and the main control board 421, and the second electrical connection column 425 electrically connects the second PCB board 423 and the main control board 421, so that a potential difference is formed between the side wall 11 of the ionization chamber and the inner needle 13 on the inner side. The main control board 421 is provided with a mounting hole, through which the ultraviolet lamp 31 of the ultraviolet light generator 3 can pass, so that the ultraviolet light generating interface 311 of the ultraviolet lamp 31 can be aligned with the third hole at the upper end of the ionization chamber side wall 11, and a sealing structure 426 is provided on the outer side of the connection between the ultraviolet lamp 31 and the first PCB board 422 facing the main control board 421. The sealing structure 426 is used to seal the contact position between the ultraviolet light generating interface 311 of the ultraviolet light generator 3 and the ionization chamber side wall 11 to prevent the detection gas from overflowing from the ionization inner space 12. The sealing structure 426 can be a sealing ring or a sealing ring, etc.

[0066] After research, it is found that ozone ions have the effect of cleaning organic pollutants accumulated in the ionization chamber 1 and on the interface of the ultraviolet lamp 31. Because the ionization chamber 1 is set on the necessary path of the airway 2, the ozone ions generated by the ultraviolet light in the ionization inner space 12 are basically taken out by the detection gas, and the cleaning ability is basically eliminated, which makes it impossible to remove the organic pollutants on the interface of the ultraviolet lamp 31, thereby shortening the service life. In the present application, the ionization structure is also provided with a cleaning mechanism, which includes a first motion mechanism, a second motion mechanism and a wiping member 55. The first motion mechanism can drive the ultraviolet light generator 3 to approach or move away from the ionization chamber side wall 11, and the second motion mechanism can control the wiping member 55 to swing; so that after the first motion mechanism controls the ultraviolet light generator 3 to move away from the ionization chamber side wall 11, the second motion mechanism can control the wiping member 55 to swing and wipe the ultraviolet light generating interface 311 of the ultraviolet light generator 3. By wiping the ultraviolet light generating interface 311 of the ultraviolet light generator 3, the ultraviolet light generating interface 311 can be kept clean for a long time, and the performance degradation phenomenon caused by the accumulation of pollutants can be reduced as much as possible or even eliminated.

[0067] like Figure 16-Figure 19 As shown, the first motion mechanism includes a first motor 51 and a connecting rod mechanism 53. The first motor 51 is arranged on the main control board 421. The connecting rod mechanism 53 connects the ultraviolet light generator 3 and the rotating shaft of the first motor 51. The rotation of the first motor 51 drives the connecting rod mechanism 53 to rotate, thereby driving the ultraviolet light generator 3 to move, and controlling the ultraviolet light generator 3 to move away from or close to the side wall 11 of the ionization chamber. Optionally, the ultraviolet light generator 3 is moved away from or close to the side wall 11 of the ionization chamber by rotation. The ultraviolet light generator 3 includes an ultraviolet lamp 31 and an ultraviolet mounting cover 32. The ultraviolet lamp 31 is embedded in the ultraviolet mounting cover 32. One side of the ultraviolet mounting cover 32 is hinged to the main control board 421 through an ultraviolet mounting hinge shaft 33. The first motor 51 rotates to drive the connecting rod mechanism 53 to rotate, thereby driving the ultraviolet light generator 3 to rotate along the ultraviolet mounting hinge shaft 33, so that the ultraviolet light generator 3 is moved away from or close to the side wall 11 of the ionization chamber. This control method can ensure the consistency of the movement of the ultraviolet light generator 3 away from or close to the side wall 11 of the ionization chamber, and thus ensure that the ultraviolet light generating interface 311 of the ultraviolet light generator 3 can be installed in place after cleaning and aligned with the third hole.

[0068] The second motion mechanism includes a second motor 52, a rocker arm 54 and a wiping member 55. The second motor 52 is arranged on the main control board 421. The rocker arm 54 connects the rotating shaft of the second motor 52 and the wiping member 55. After the first motion mechanism controls the ultraviolet light generator 3 to move away from the side wall 11 of the ionization chamber, the second motor 52 controls the rocker arm 54 and the wiping member 55 to swing back and forth to wipe the ultraviolet light generating interface 311 of the ultraviolet light generator 3, wherein one side of the wiping member 55 wiping the ultraviolet light generating interface 311 is adapted to the shape of the ultraviolet light generating interface 311 after rotation, thereby ensuring the cleanliness and safety of wiping and avoiding damage to the ultraviolet light generating interface 311.

[0069] On the premise that the ionization chamber 1 is set on the necessary path of the airway 2, a cleaning mechanism is set to achieve the two goals of not attenuating the cleaning performance of the components in the ionization chamber 1 and ensuring that the air intake of the ionization chamber 1 is sufficient and the sensitivity and accuracy are high.

[0070] In the atmospheric composition detection sensor described in this embodiment, the side wall 11 of the ionization chamber is designed to be barrel-shaped. The structure of the ionization chamber 1 is composed of two components, an outer barrel and an inner needle 13. When working, the two components have a large potential difference, so that a high-voltage electric field is formed in the barrel-shaped ionization chamber 1. One end of the barrel-shaped ionization chamber 1 is an ultraviolet light source (UV). When the gas to be measured enters the ionization chamber 1, it is immediately irradiated by ultraviolet light. When the gas absorbs high-energy ultraviolet light, the pollutant gas molecules are excited by the ultraviolet light and temporarily lose electrons to become positively charged ions. Driven by the high and low potential energy environment in the ionization chamber 1, the charged particles quickly flow to the outer barrel or the inner needle 13, forming a current signal in the detection circuit connected to the ionization chamber 1.

[0071] In order to meet the requirements of response speed and accuracy, the present embodiment sets an airway 2 in the sensor, places the barrel-shaped ionization chamber side wall 11 in the only gas flow channel, and sets vent holes (first hole 111 and second hole 112) on the ionization chamber side wall 11, so that the gas to be measured can actively and smoothly flow through the ionization inner space 12, and the gas involved in ionization is more saturated and updated quickly, so that the detection response is faster, the signal amount is larger, the gas update cycle is short, and the signal is more real-time and sensitive, so that the sensor response sensitivity is high and the result data is consistent with the actual concentration of the gas to be measured. The gas in the airway 2 is driven by the air pump at the rear end of the airway, and the gas maintains a continuous and stable flow, which makes it difficult for ozone ions to gather and stay in the ionization chamber 1, thereby further eliminating the problem of reduced ionization efficiency caused by ozone, and at the same time providing a guarantee for the update efficiency of the airway 2. The structure of the airway 2 is designed to improve the gas renewal efficiency in the ionization inner space 12, thereby improving the ionization effect, reducing the residence of gas or pollutants in the airway 2, making the gas renewal in the gas channel more thorough, making the sensor response more accurate and faster, and reducing the impact on data timeliness. In order to achieve long-term stability in ionization performance and reduce data drift caused by attenuation, this embodiment can also use a self-developed cleaning mechanism, which is installed inside the sensor and directly acts on the related components of the ionization chamber 1, so that the related components of the ionization chamber 1 can be kept clean for a long time and eliminate the performance attenuation phenomenon caused by the accumulation of pollutants. This embodiment also optimizes the installation of structures such as the ionization chamber 1, the airway 2, the main control board 421, and the cleaning mechanism, so that the installation is convenient, and a better environment is provided for the ionization effect and the accuracy of the detection results as much as possible, and the volume of the sensor can be controlled as much as possible.

[0072] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An atmospheric component detection sensor, characterized in that: include A shell, an air passage (2) being provided on the inner side of the shell, and an air inlet (71) and an air outlet (72) being connected to the inside and outside of the shell, the air inlet (71) being connected to one end of the air passage (2), and the air outlet (72) being connected to the other end of the air passage (2); A main control board (421), the main control board (421) being arranged in the housing, and a detection circuit being arranged on the main control board (421); an ionized inner space (12), the ionized inner space (12) being arranged in the airway (2), the airway (2) being connected at both ends of the airway (2) through the ionized inner space (12); A high potential electrode, the high potential electrode is disposed in the housing and is electrically connected to the detection circuit; A low potential electrode, the low potential electrode being electrically connected to the detection circuit, and the low potential electrode and the high potential electrode being able to form an electric potential field in the ionization inner space (12) after being energized, the electric potential field having a potential difference; An ultraviolet light generator (3) is arranged in the shell, and the ultraviolet light generator (3) can provide ionization energy for the gas entering the ionization inner space (12), so that gas molecules in the ionization inner space (12) can be ionized.

2. The atmospheric component detection sensor according to claim 1, characterized in that: The invention comprises an ionization chamber (1), wherein the ionization chamber (1) has an ionization chamber side wall (11), an ionization inner space (12), an ionization chamber gas inlet and an ionization chamber gas outlet, wherein the ionization inner space (12) is located in the ionization chamber side wall (11), the ionization chamber side wall (11) is at least one of the high potential electrode and the low potential electrode, the ionization chamber gas inlet is connected to one end of the gas channel (2) close to the gas inlet (71) and the ionization inner space (12), and the ionization chamber gas outlet is connected to one end of the gas channel (2) close to the gas outlet (72) and the ionization inner space (12).

3. The atmospheric component detection sensor according to claim 2, characterized in that: The air channel (2) is a groove-shaped structure opened on the inner surface of the shell, the notch of the groove-shaped structure faces the inside of the shell, the main control board (421) covers the notch of the air channel (2), and the main control board (421) seals the notch.

4. The atmospheric component detection sensor according to claim 3, characterized in that: The cross-sectional area difference at different longitudinal positions of the airway (2) does not exceed ±10%.

5. The atmospheric component detection sensor according to claim 4, characterized in that: The outer contours of the cross section and the longitudinal section of the shell are both rectangular; the air duct (2) comprises an air inlet duct (21), an air outlet duct (23) and a detection air duct (22); the detection air duct (22) is arranged along the width direction of the shell; the air inlet duct (21) and the air outlet duct (23) are arranged along the length direction of the shell; the air inlet duct (21) and the air outlet duct (23) are located on the same side of the detection air duct (22); the air inlet duct (21) and the air outlet duct (23) are connected to two ends of the detection air duct (22); the air inlet duct (21) is connected to an air inlet port (71); the air outlet duct (23) is connected to an air outlet port (72); and the ionization chamber (1) is arranged in the detection air duct (22).

6. The atmospheric component detection sensor according to claim 5, characterized in that: The portion where the air inlet passage (21) and the detection passage (22) communicate is an arc-shaped passage (24), and the portion where the air outlet passage (23) and the detection passage (22) communicate is an arc-shaped passage (24).

7. The atmospheric component detection sensor according to claim 6, characterized in that: A guide fin (25) is provided on the inner wall of the arc-shaped channel (24), and the direction of the guide fin (25) is adapted to the central axis of the arc-shaped channel (24).

8. The atmospheric component detection sensor according to claim 5, characterized in that: The interior of the detection airway (22) is a rectangular cross-section with an arc-shaped chamfer.

9. The atmospheric component detection sensor according to claim 2, characterized in that: It also comprises an inner needle (13), the inner cross-section of the ionization chamber side wall (11) is circular, the inner needle (13) is arranged in the radial middle of the ionization inner space (12), one of the inner needle (13) and the ionization chamber side wall (11) is a high potential electrode and the other is a low potential electrode, and the inner needle (13) and the ionization chamber side wall (11) can be energized to form the electric potential field; The ionization chamber gas inlet is a first hole (111), and the ionization chamber gas outlet is a second hole (112); the first hole (111) and the second hole (112) are arranged on the ionization chamber side wall (11); the first hole (111) is used to connect the airway (2) and the ionization inner space (12); and the second hole (112) is used to connect the airway (2) and the ionization inner space (12).

10. The atmospheric component detection sensor according to claim 9, characterized in that: The side wall (11) of the ionization chamber is a high-potential electrode, and the inner needle (13) is a low-potential electrode.

11. The atmospheric component detection sensor according to claim 10, characterized in that: The inner needle (13) is arranged in the middle of the ionization inner space (12).

12. The atmospheric component detection sensor according to claim 9, characterized in that: The ultraviolet light generator (3) is arranged on one axial side of the ionization chamber side wall (11); one end of the ionization chamber side wall (11) provided with the ultraviolet light generator (3) has a third hole; an ultraviolet light generating interface (311) of the ultraviolet light generator (3) is directed toward the ionization inner space (12) through the third hole.

13. The atmospheric component detection sensor according to claim 12, characterized in that: A sealing structure (426) is provided between the ultraviolet light generator (3) and the side wall (11) of the ionization chamber.

14. The atmospheric component detection sensor according to claim 12, characterized in that: It also includes a cleaning mechanism, the cleaning mechanism including a first motion mechanism, a second motion mechanism and a wiping member (55), the first motion mechanism being capable of driving the ultraviolet light generator (3) to move closer to or farther away from the ionization chamber side wall (11), and the second motion mechanism being capable of controlling the wiping member (55) to swing; After the first motion mechanism controls the ultraviolet light generator (3) to move away from the ionization chamber side wall (11), the second motion mechanism can control the wiping member (55) to swing and wipe the ultraviolet light generating interface (311) of the ultraviolet light generator (3).

15. An atmospheric component detection sensor according to any one of claims 1 to 14, characterized in that: The air outlet (72) is connected to an air pump, and the air pump is located outside the shell.

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