Ionization structure

Abstract

The invention relates to the technical field of ionization structures, in particular to an ionization structure which comprises an ionization bin provided with an ionization bin side wall, an ionization inner space, an ionization bin gas inlet and an ionization bin gas outlet. The ionization inner space is located in the side wall of the ionization bin, gas molecules can be ionized in the ionization inner space, a potential field can be formed in the ionization inner space, and electric signals can be generated after ionization; the ionization bin is arranged on the road where detection gas must pass through, the detection gas cannot be affected to enter and exhaust, ozone ions in the ionization inner space are exhausted along with the detection gas, interference of ozone on the ionization process is reduced, and the ionization effect is improved; the introduced detection gas can be basically ionized, so that the amount of the ionized gas in the same time is larger, more positive ions are obtained by ionization, the electric signal obtained by ionization is stronger, the response sensitivity of the sensor is high, the result data are consistent with the actual concentration of the detected gas, and the detection result is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of ionization structures, in particular to an ionization structure. Background Art

[0002] The sensor technology principle is the same as the PID photoionization sensor of the same type. It requires the use of ultraviolet (UV) light source to ionize organic molecules into positive and negative ions (ionization) that can be detected by the detector. The detector captures the positive and negative charges of the ionized gas and converts them into current signals to measure the gas concentration. In technical implementation, the detector is usually designed in the form of an ionization chamber.

[0003] During the operation of the PID sensor, ultraviolet light will generate a large amount of ozone ions. The strong oxidizing property of ozone ions will oxidize some VOC molecules entering the ionization chamber into some small molecules, which will prevent them from being ionized by the ultraviolet lamp, reducing the ionization effect. However, ozone ions have the effect of cleaning organic pollutants accumulated in the ionization chamber, especially on the interface of the ultraviolet lamp. Therefore, in the process of technical implementation, in order to avoid the contamination of the components in the ionization chamber as much as possible, and to avoid the premature degradation of the ionization body performance and the occurrence of baseline drift, the same type of sensor adopts the free diffusion of gas molecules. A relatively passive way to capture pollutant molecules. The ionization chamber has a concave structure with only an inlet but no outlet. The gas escapes into the chamber from the inlet to achieve ionization, which minimizes the flow of gas in the chamber and allows ozone ions to stay and gather in the chamber as much as possible, ensuring effective cleaning of the chamber. However, in this way of free diffusion of sampled gas into the chamber, not all of the sampled gas actually passes through or enters the chamber to participate in the reaction. Some gas leaves directly without entering the chamber for ionization, resulting in low sensor response sensitivity or inconsistent result data with the actual concentration of the measured gas. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem in the prior art that the ionization chamber has only an inlet but no outlet, the sampled gas freely diffuses into the ionization chamber for ionization, the ozone ions existing in the ionization chamber reduce the ionization effect, and the small total amount of ionized gas leads to low sensor response sensitivity or the result data is inconsistent with the actual concentration of the measured gas, and an ionization structure is provided.

[0005] The present invention provides an ionization structure, comprising an ionization chamber, wherein the ionization chamber has an ionization chamber side wall, an ionization inner space, an ionization chamber gas inlet and an ionization chamber gas outlet;

[0006] The ionization inner space is located inside the side wall of the ionization chamber, gas molecules can be ionized in the ionization inner space, an electric potential field with a potential difference can be formed in the ionization inner space, and the side wall of the ionization chamber is an electrode;

[0007] The ionization chamber gas inlet is used to connect the first gas channel and the ionization inner space, and the ionization chamber gas outlet is used to connect the second gas channel and the ionization inner space, so that the ionization chamber connects the first gas channel and the second gas channel.

[0008] In this scheme, after the gas enters the ionization inner space, the gas molecules in the ionization inner space temporarily lose electrons under the excitation of high energy (such as ultraviolet light, etc.) and become positively charged ions, thereby realizing the ionization of the gas molecules and forming charged particles. Driven by the electric potential energy of the potential field, the charged particles quickly collide with the electrode under the action of the electric potential energy, generating a current signal for subsequent detection and judgment.

[0009] By arranging an ionization chamber gas inlet and an ionization chamber gas outlet on the ionization chamber side wall of the ionization chamber, the ionization chamber gas inlet is connected to the first gas channel and the ionization inner space, and the ionization chamber gas outlet is connected to the second gas channel and the ionization inner space, so that the detection gas must enter the ionization inner space from the first gas channel through the ionization chamber gas inlet for ionization, and then enter the second gas channel through the ionization chamber gas outlet and then leave, that is, the first gas channel and the second gas channel are connected through the ionization chamber, so that the detection gas must enter the ionization inner space for ionization, which makes the ionization inner space have more detection gas for ionization, compared with the sampling gas The method of freely diffusing into the ionization chamber for ionization, the present application sets the ionization chamber on the path that the detection gas must pass, 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, reducing the interference of ozone on the ionization process, thereby improving the ionization effect; and the introduced detection gas 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 result is more accurate.

[0010] Preferably, the inner cross-section of the side wall of the ionization chamber is circular, the ionization chamber further comprises an inner needle, the inner needle is arranged in the radial middle of the inner ionization space, one of the inner needle and the side wall of the ionization chamber is a high potential electrode, and the other is a low potential electrode, and the inner needle and the side wall of the ionization chamber can be energized to form the electric potential field;

[0011] 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 first air channel and the ionization inner space, and the second hole is used to connect the second air channel and the ionization inner space, so that the ionization chamber is connected with the first air channel and the second air channel.

[0012] 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.

[0013] Preferably, the side wall of the ionization chamber is a high potential electrode, and the inner needle is a low potential electrode, that is, when 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 ionized positively charged ions can flow to the inner needle and be captured by the inner needle to form an electrical signal.

[0014] Compared to making the potential of the side wall of the ionization chamber lower than the potential of the inner needle, that is, allowing the positively charged ions after ionization to flow toward the side wall of the ionization chamber, this scheme allows the positively charged ions after ionization to flow toward the inner needle. 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 subject to interference, which is more conducive to ensuring the detection results.

[0015] Preferably, the inner needle is disposed in the middle of the ionization inner space, so that the distance between the inner needle and the side wall of the ionization chamber 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.

[0016] Preferably, the first hole and the second hole are arranged relative to each other so that the flow rate of the gas in the ionization space is relatively balanced, so that the ionization process is relatively balanced, thereby ensuring the stability of the data and avoiding detection data drift due to ionization instability.

[0017] Preferably, the cross-sections of the first hole, the second hole, the first airway and the second airway are the same, so that the flow rate of the gas in the ionization space is relatively balanced, and the ionization process is relatively balanced, thereby ensuring the stability of the data and avoiding detection data drift due to ionization instability.

[0018] Preferably, the cross-sections of the first air channel and the second air channel are circular, which reduces the possibility of generating eddy currents and makes the detection result more accurate.

[0019] Preferably, an ultraviolet light generator is provided on one axial side of the ionization chamber side wall, and one 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.

[0020] 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.

[0021] Preferably, the ultraviolet light generating interface of the ultraviolet light generator, the inner cross-section of the third hole and the inner cross-section of the side wall of the ionization chamber are all the same.

[0022] Ensure that the ultraviolet light emitted from the ultraviolet light generating interface can enter the ionization inner space to improve the utilization rate.

[0023] Preferably, the ionization chamber side wall is fixedly arranged between the first PCB board and the second PCB board, one end of the ionization chamber side wall having a third hole is electrically connected to the circuit of the first PCB board, the other end of the ionization chamber side wall has a fourth hole, the inner needle passes through the fourth hole to be electrically connected to the second PCB board, the second PCB board blocks the fourth hole, and the ultraviolet light generator passes through the first PCB board and is arranged in the third hole.

[0024] PCB, or Printed Circuit Board, is a component used to fix and connect electronic components. It consists of an insulating substrate and conductive patterns printed thereon. These printed conductive patterns provide electrical connections for the electronic components thereon.

[0025] The circuit of the first PCB board provides an electric potential for the side wall of the ionization chamber, and the circuit of the second PCB board provides an electric potential for the inner needle, forming a high and low potential difference. The ultraviolet light generator blocks the third hole, and the second PCB board blocks the fourth hole to prevent the detection gas from overflowing from the inner space of the ionization chamber.

[0026] Preferably, a sealing structure is provided between the ultraviolet light generator and the side wall of the ionization chamber, and 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.

[0027] Preferably, the first PCB board has a main PCB board on a side away from the second PCB board, and the first PCB board and the second PCB board are electrically connected to the main PCB board respectively.

[0028] Preferably, the first air duct and the second air duct both include a groove structure arranged on the air duct substrate, the groove structures of the first air duct and the second air duct are integrated, the ionization chamber, the first PCB board and the second PCB board are integrally embedded between the groove structures of the first air duct and the second air duct, and the main PCB board closes the openings of the groove structures of the first air duct and the second air duct.

[0029] 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;

[0030] 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.

[0031] By wiping the UV light generating interface of the UV light generator, the UV light generating interface can be kept clean for a long time, and the performance degradation phenomenon caused by the accumulation of pollutants can be minimized or even eliminated.

[0032] Preferably, the inner needle and the side wall of the ionization chamber are both metal structures.

[0033] Preferably, the inner needle and the side wall of the ionization chamber are both copper-gold-plated structures, with optimal surface conductivity and better anti-oxidation and corrosion performance.

[0034] Preferably, the ionization structure is used in a sensor and is arranged inside the sensor.

[0035] Preferably, an air pump is also included, the air pump is connected to the second airway, the second airway is an exhaust channel, and driven by the air pump, the gas maintains a continuous and stable flow in the first airway, the ionization inner space and the second airway, making it difficult for ozone ions to gather and reside in the ionization inner space, thereby further eliminating the problem of reduced ionization efficiency caused by ozone. And it can make the gas enter the ionization inner space faster, can improve the response speed, and make the detection efficiency higher; and the gas update cycle entering the ionization inner space is short, which is conducive to obtaining more accurate detection results in real time.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention provides an ionization structure, which arranges an ionization chamber on a path that a detection gas must pass through without affecting the entry and discharge of the detection gas, so that ozone ions in the ionization inner space are discharged along with the detection gas, thereby improving the ionization effect; and the introduced detection gas can be basically ionized, so that the amount of ionized gas in the same time is larger, more positively charged ions are obtained by ionization, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the ionization structure plane;

[0039] Figure 2 Schematic diagram of the ionized structure Figure 1 (For ease of viewing, the upper closed portion of the first airway and the second airway is not shown);

[0040] Figure 3 Schematic diagram of the ionized structure Figure 2 (For ease of viewing, the upper closed portion of the first airway and the second airway is not shown);

[0041] Figure 4 It is a side view schematic diagram of the ionization structure;

[0042] Figure 5 This is a three-dimensional schematic diagram of the installation of the ionization chamber;

[0043] Figure 6 This is a schematic diagram of the installation side of the ionization chamber;

[0044] Figure 7 This is a front view of the installation of the ionization chamber;

[0045] Figure 8 for Figure 7 Sectional view at AA in the middle;

[0046] Fig. 9 It is a front view schematic diagram of the side wall of the ionization chamber;

[0047] Fig.10 It is a side schematic diagram of the side wall of the ionization chamber;

[0048] Fig.11 It is a plan view of the ionization chamber (looking up and looking down);

[0049] Fig.12 Illustration of the work of the cleaning agency Figure 1 ;

[0050] Fig.13 Illustration of the work of the cleaning agency Figure 2 ;

[0051] Fig.14 Illustration of the work of the cleaning agency Figure 3 ;

[0052] Fig.15 This is the working principle of the cleaning organization Figure 4 .

[0053] 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; 21. first airway; 22. second airway; 3. ultraviolet light generator; 31. ultraviolet lamp; 311. ultraviolet light generating interface; 32. ultraviolet mounting cover; 33. ultraviolet mounting hinge; 4. sensor; 41. airway substrate; 421. main PCB 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. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Example 1

[0061] like Figure 1-Figure 3 As shown, an ionization structure includes 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;

[0062] The ionization inner space 12 is located in the ionization chamber side wall 11, and the gas molecules can be ionized in the ionization inner space 12. The ionization inner space 12 can form an electric potential field with a potential difference, and the ionization chamber side wall 11 is an electrode;

[0063] The ionization chamber gas inlet is used to connect the first gas channel 21 and the ionization inner space 12 , and the ionization chamber gas outlet is used to connect the second gas channel 22 and the ionization inner space 12 , so that the ionization chamber 1 connects the first gas channel 21 and the second gas channel 22 .

[0064] In this scheme, after the gas enters the ionization inner space, the gas in the ionization inner space temporarily loses electrons under the excitation of high energy (such as ultraviolet light, etc.) and becomes positively charged ions, thereby realizing the ionization of gas molecules and forming charged particles. Driven by the electric potential energy of the potential field, the charged particles quickly collide with the electrode under the action of the electric potential energy, generating a current signal for subsequent detection and judgment.

[0065] The ionization inner space 12 is a part of the channel for gas circulation and is also used to ionize gas molecules. The gas entering the ionization inner space 12 through the first gas channel 21 can be ionized. The ionization method can be irradiated by ultraviolet light source, such as setting an ultraviolet light generator 3, which can emit ultraviolet light to the ionization inner space 12, so that the gas can be ionized in the ionization inner space 12; at the same time, the positively charged ions after ionization are attached to the low-potential components under the potential energy of the potential field of the ionization inner space 12, and are used for subsequent detection and judgment. Regarding the method of forming an electric potential field in the ionization inner space 12, it can be achieved by electrification, so that different components have high and low potentials, forming a potential difference, and then forming an electric potential field.

[0066] In the prior art, the ionization chamber 1 is a groove type with only one airway interface. After the gas is sampled, it enters the ionization chamber 1 for ionization by dissipation. This method can ensure that ozone ions can be retained in the ionization chamber 1, and then the ozone ions can be used to clean the ionization process. However, the amount of gas entering the ionization chamber 1 by dissipation is less than the total amount of sampled gas, which is inconsistent with the actual sampling; and ozone ions affect the gas detection ionization, making the gas that can be ionized less, and then the amount of charged ions generated by ionization per unit time is small, which may be difficult to meet the electrical signal required for the detection signal, and then continuous accumulation is required, which leads to a long reaction time and low detection sensitivity. Moreover, because the gas is not updated in time, the detection result is not accurate enough.

[0067] In the present solution, an ionization chamber gas inlet and an ionization chamber gas outlet are arranged on the ionization chamber side wall 11 of the ionization chamber 1, so that the ionization chamber gas inlet is connected to the first gas channel 21 and the ionization inner space 12, and the ionization chamber gas outlet is connected to the second gas channel 22 and the ionization inner space 12, so that the detection gas must enter the ionization inner space 12 from the first gas channel 21 through the ionization chamber gas inlet for ionization, and then enter the second gas channel 22 through the ionization chamber gas outlet and then leave, that is, the first gas channel 21 and the second gas channel 22 are connected through the ionization chamber 1, so that the detection gas must enter the ionization inner space 12 for ionization, which makes the ionization inner space 12 have more detection gas for ionization, compared with the conventional method. In the method in which the sampling gas freely diffuses into the ionization chamber for ionization, the present application sets the ionization chamber 1 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 12 are discharged along with the detection gas, reducing the interference of ozone on the ionization process, thereby reducing the influence of ozone ions on the amount of ionized gas and improving the ionization effect; and the introduced detection gas 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 4 has a high response sensitivity, and the result data is consistent with the actual concentration of the gas being measured, so that the detection result is more accurate.

[0068] In this solution, the ionization chamber side wall 11 can adopt two sheet structures, the space between the two sheet structures is the ionization inner space 12, and the two sheet structures have high and low potentials respectively, that is, the two sheet structures are respectively a high potential electrode and a high potential electrode, and the other is a low potential electrode.

[0069] In one or more embodiments, Figure 1-Figure 3 and Fig.11 As shown, the inner cross-section of the ionization chamber side wall 11 is circular, and the ionization chamber 1 also includes an inner needle 13, which is arranged in the radial middle of the ionization inner space 12, and the inner needle 13 and the ionization chamber side wall 11 form high and low potentials; compared with the ionization chamber side wall 11 using two sheet structures to form a high and low potential structure, this solution uses an ionization chamber side wall 11 with a circular inner cross-section, and 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, the inner needle 13 and the ionization chamber side wall 11 can be energized to form the potential field, that is, the inner needle 13 and the ionization chamber side wall 11 form high and low potentials, and 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.

[0070] 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 first air channel 21 and the ionization inner space 12, and the second hole 112 is used to connect the second air channel 22 and the ionization inner space 12, so that the ionization chamber 1 is connected to the first air channel 21 and the second air channel 22.

[0071] Optionally, 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, 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 to the captured positively charged ions after ionization smaller, which is more conducive to ensuring the detection results.

[0072] Optionally, the ionization chamber side wall 11 and the inner needle 13 are conductive structures, thereby forming a potential difference. Preferably, the inner needle 13 and the ionization chamber side wall 11 are both metal structures. Further preferably, the inner needle 13 and the ionization chamber side wall 11 are both copper-plated gold structures, which have the best surface conductivity and better anti-oxidation and corrosion performance.

[0073] Optional, such as Fig.11 As shown, the inner needle 13 is disposed 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 gas ionization, which is beneficial to improving reaction sensitivity and accuracy.

[0074] Optional, such as Figure 1-Figure 3 and Fig. 9 As shown, the first hole 111 and the second hole 112 are arranged relative to each other, so that the flow rate of the gas in the ionization inner space 12 is relatively balanced, so that the ionization process is relatively balanced, thereby ensuring the stability of the data and avoiding the drift of the detection data due to unstable ionization.

[0075] After research, it is found that when the cross-sections of the first hole 111, the second hole 112, the first airway 21, and the second airway 22 are not completely the same, the flow rate of the sampled gas entering the first airway 21 will change when passing through the first hole 111 and the second hole 112, which may cause the gas entering and discharging at different rates in the ionization inner space 12, affecting the ionization stability of the ionization inner space 12. Optionally, the cross-sections of the first hole 111, the second hole 112, the first airway 21, and the second airway 22 are the same, so that the flow rate of the gas in the ionization inner space 12 is relatively balanced, so that the ionization process is relatively balanced, thereby ensuring the stability of the data and avoiding the drift of the detection data due to ionization instability.

[0076] After research, it was found that the first air duct 21 and the second air duct 22 can adopt various cross-sectional shapes, but the cross-sections of the first air duct 21 and the second air duct 22 have an impact on the gas flow, which may generate eddy currents and thus affect the electric potential field and the detection results. According to research, when the central angle corresponding to the curved surface of the air duct is larger, the probability of generating eddy currents is smaller; optionally, the cross-sections of the first air duct 21 and the second air duct 22 are circular, which reduces the possibility of generating eddy currents and makes the detection results more accurate.

[0077] Optional, such as Figure 1 and Figure 2As shown, an ultraviolet light generator 3 is provided on one axial side of the ionization chamber side wall 11, and one end of the ionization chamber side wall 11 provided with the ultraviolet light generator 3 has a third hole, and an 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 entering the ionization inner space 12.

[0078] Optionally, the ultraviolet light generating interface 311 of the ultraviolet light generator 3, the inner cross section of the third hole and the inner cross section of the ionization chamber side wall 11 are all the same, so as to ensure that the ultraviolet light emitted by the ultraviolet light generating interface 311 can enter the ionization inner space 12, thereby improving the utilization rate.

[0079] Optional, such as Figure 5-Figure 8 As shown, the ionization chamber side wall 11 is fixedly arranged between the first PCB board 422 and the second PCB board 423, one end of the ionization chamber side wall 11 having a third hole is electrically connected to the circuit of the first PCB board 422, and the other end of the ionization chamber side wall 11 has a fourth hole, the inner needle 13 passes through the fourth hole to be electrically connected to the second PCB board 423, the second PCB board 423 blocks the fourth hole, and the ultraviolet light generator 3 passes through the first PCB board 422 and is arranged in the third hole. The circuit of the first PCB board 422 provides an electric potential for the ionization chamber side wall 11, and the circuit of the second PCB board 423 provides an electric potential for the inner needle 13, forming a high and low potential difference. The ultraviolet light generator 3 blocks the third hole, and the second PCB board 423 blocks the fourth hole to prevent the detection gas from overflowing from the ionization inner space 12.

[0080] Optionally, a sealing structure 426 is provided between the ultraviolet light generator 3 and the side wall 11 of the ionization chamber, and 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 direct sealing or indirect sealing can be adopted.

[0081] Optionally, the first PCB board 422 has a main PCB board 421 on one side away from the second PCB board 423 , and the first PCB board 422 and the second PCB board 423 are electrically connected to the main PCB board 421 respectively, and the power supply of the first PCB board 422 and the second PCB board 423 is controlled by the main PCB board 421 .

[0082] Optional, such as Figure 1 , Figure 2 and Figure 5-Figure 8 As shown, the first air channel 21 and the second air channel 22 both include a groove structure arranged on the air channel substrate 41, the groove structures of the first air channel 21 and the second air channel 22 are integrated, the ionization chamber 1, the first PCB board 422 and the second PCB board 423 are integrally embedded between the groove structures of the first air channel 21 and the second air channel 22, and the main PCB board 421 closes the openings of the groove structures of the first air channel 21 and the second air channel 22. The ultraviolet light generator 3 blocks the third hole, and the second PCB board 423 blocks the fourth hole to prevent the detection gas from overflowing from the ionization inner space 12. The ionization chamber 1, the first PCB board 422 and the second PCB board 423 are integrally embedded between the groove structures of the first air channel 21 and the second air channel 22, which is convenient for installation.

[0083] like Figure 5-Figure 8 As 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 hole, and the main The PCB 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 on both sides, and the first electrical connection column 424 and the second electrical connection column 425 extend to the main PCB board 421. The first electrical connection column 424 electrically connects the first PCB board 422 and the main PCB board 421, and the second electrical connection column 425 electrically connects the second PCB board 423 and the main PCB board 421, so that an electric potential difference is formed between the side wall 11 of the ionization chamber and the inner needle 13 on the inside. The main PCB 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 of the ultraviolet lamp 31 can be aligned with the third hole at the upper end of the ionization chamber side wall 11. A sealing structure 426 is provided on the outside of the connection between the ultraviolet lamp 31 and the first PCB board 422 on one side facing the main PCB 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.

[0084] After research, it is found that ozone ions have the effect of cleaning organic pollutants accumulated in the ionization chamber and on the interface of the ultraviolet lamp. Because the ionization chamber is set on the necessary path of the airway, 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, thereby shortening the service life. In the present application, the ionization structure is also provided with a cleaning mechanism, and the cleaning mechanism includes a first motion mechanism, a second motion mechanism and a wiping member, the first motion mechanism can drive the ultraviolet light generator 3 to approach or move away from the side wall 11 of the ionization chamber, and the second motion mechanism can control the wiping member to swing; so that 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 motion mechanism can control the wiping member 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.

[0085] like Figure 12-Figure 15 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 PCB 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 PCB 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, thereby ensuring 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.

[0086] The second motion mechanism includes a second motor 52, a swing rod 54 and a wiping component 55. The second motor 52 is arranged on the main PCB board 421. The swing rod 54 connects the rotating shaft of the second motor 52 and the wiping component 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 swing rod 54 and the wiping component 55 to swing back and forth to wipe the ultraviolet light generating interface 311 of the ultraviolet light generator 3, wherein the wiping component 55 wipes one side of the ultraviolet light generating interface 311 to adapt 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.

[0087] On the premise that the ionization chamber 1 is set on the necessary path of the airway, a cleaning mechanism is set to achieve the two goals of not attenuating the cleaning performance of the components in the ionization chamber and ensuring that the air intake in the ionization chamber is sufficient and has high sensitivity and accuracy.

[0088] Optional, such as Figure 1 As shown, the ionization structure also includes an air pump, which is connected to the second air channel 22. The second air channel 22 is an exhaust channel. The air pump drives the gas to maintain a continuous and stable flow in the first air channel 21, the ionization inner space 12 and the second air channel 22, making it difficult for ozone ions to gather and reside in the ionization inner space 12, thereby further eliminating the problem of reduced ionization efficiency caused by ozone. And it can 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 it ensures that the air can continuously and stably enter the gas sensor module, ensuring the stable state of the air pressure entering the gas sensor module. 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.

[0089] The ionization structure of this embodiment is designed to design the side wall of the ionization chamber into a barrel shape. The ionization chamber structure is composed of two components, an outer barrel and an inner needle. 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. One end of the barrel-shaped ionization chamber is an ultraviolet light source (UV). When the gas to be measured enters the ionization chamber, it is immediately irradiated by ultraviolet light. When the gas absorbs high-energy ultraviolet light, the 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, the charged particles quickly flow to the outer barrel or the inner needle, forming a current signal in the circuit connected to the ionization chamber.

[0090] In order to meet the requirements of response speed and accuracy, this embodiment places the side wall of the barrel-shaped ionization chamber in the only gas flow channel (the overall airway formed by the first airway and the second airway), and sets vents (the first hole and the second hole) on the side wall of the ionization chamber, so that the gas to be measured can flow through the ionization space actively and smoothly, and the gas involved in the ionization is more saturated and updated quickly, so that the detection response is faster, the signal 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 is driven by the air pump at the rear end of the air path, and the gas maintains a continuous and stable flow, which makes it difficult for ozone ions to gather and stay in the ionization chamber, thereby further eliminating the problem of reduced ionization efficiency caused by ozone. In order to achieve long-term stability of ionization performance and reduce data drift caused by attenuation, this embodiment adopts a self-developed cleaning mechanism, which is installed inside the sensor and directly acts on the relevant components of the ionization chamber, so that the relevant components of the ionization chamber can be kept clean for a long time, eliminating the performance attenuation phenomenon caused by the accumulation of pollutants.

[0091] 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 ionization structure, 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; The ionization inner space (12) is located in the ionization chamber side wall (11), gas molecules can be ionized in the ionization inner space (12), an electric potential field with an electric potential difference can be formed in the ionization inner space (12), and the ionization chamber side wall (11) is an electrode; The ionization chamber gas inlet is used to connect the first gas channel (21) and the ionization inner space (12), and the ionization chamber gas outlet is used to connect the second gas channel (22) and the ionization inner space (12), so that the ionization chamber (1) is connected to the first gas channel (21) and the second gas channel (22).

2. An ionization structure according to claim 1, characterized in that: The inner cross-section of the ionization chamber side wall (11) is circular. The ionization chamber (1) further comprises an inner needle (13). 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. 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), the ionization chamber gas outlet is a second hole (112), and the first hole (111) and the second hole (112) are arranged on the ionization chamber side wall (11).

3. An ionization structure according to claim 2, 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.

4. An ionization structure according to claim 2, characterized in that: The inner needle (13) is arranged in the middle of the ionization inner space (12).

5. An ionization structure according to claim 2, characterized in that: The first hole (111) and the second hole (112) are arranged opposite to each other.

6. An ionization structure according to claim 2, characterized in that: The cross sections of the first hole (111), the second hole (112), the first air channel (21) and the second air channel (22) are the same.

7. An ionization structure according to claim 6, characterized in that: The cross sections of the first air channel (21) and the second air channel (22) are circular.

8. An ionization structure according to claim 2, characterized in that: An ultraviolet light generator (3) is provided 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.

9. An ionization structure according to claim 8, characterized in that: The ultraviolet light generating interface (311) of the ultraviolet light generator (3), the inner cross section of the third hole and the inner cross section of the ionization chamber side wall (11) are all the same.

10. An ionization structure according to claim 8, characterized in that: The ionization chamber side wall (11) is fixedly arranged between the first PCB board (422) and the second PCB board (423); one end of the ionization chamber side wall (11) having a third hole is electrically connected to the circuit of the first PCB board (422); the other end of the ionization chamber side wall (11) has a fourth hole; the inner needle (13) passes through the fourth hole to be electrically connected to the second PCB board (423); the second PCB board (423) blocks the fourth hole; and the ultraviolet light generator (3) passes through the first PCB board (422) and is arranged in the third hole.

11. An ionization structure according to claim 10, characterized in that: A sealing structure (426) is provided between the ultraviolet light generator (3) and the ionization chamber side wall (11), and 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).

12. An ionization structure according to claim 10, characterized in that: The first PCB board (422) has a main PCB board (421) on one side away from the second PCB board (423), and the first PCB board (422) and the second PCB board (423) are respectively electrically connected to the main PCB board (421).

13. An ionization structure according to claim 12, characterized in that: The first air channel (21) and the second air channel (22) both comprise a groove structure arranged on an air channel substrate (41); the groove structures of the first air channel (21) and the second air channel (22) are formed as one body; the ionization chamber (1), the first PCB board (422) and the second PCB board (423) are integrally embedded between the groove structures of the first air channel (21) and the second air channel (22); and the main PCB board (421) closes the openings of the groove structures of the first air channel (21) and the second air channel (22).

14. An ionization structure according to claim 8, characterized in that: It also includes a cleaning mechanism, which includes a first motion mechanism, a second motion mechanism and a wiping member (55), wherein the first motion mechanism can drive the ultraviolet light generator (3) to move closer to or farther away from the ionization chamber side wall (11), and the second motion mechanism can control 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 ionization structure according to claim 2, characterized in that: The inner needle (13) and the ionization chamber side wall (11) are both metal structures.

16. An ionization structure according to claim 15, characterized in that: The inner needle (13) and the ionization chamber side wall (11) are both copper-gold-plated structures.

17. An ionization structure according to any one of claims 1 to 16, characterized in that: It also includes an air pump, which is connected to the second air channel (22).

Images