Plasma concentration detection sensor and gas ionization device

Abstract

The invention discloses a plasma concentration detection sensor and a gas ionization device, and the sensor comprises a housing which is internally provided with an air channel; the plasma generator is arranged in the air duct; the conductive metal piece is arranged corresponding to a plasma emission area of the plasma generator; the plasma concentration detection sensor main body is independent of the conductive metal piece and comprises a signal detection circuit and a signal processing unit; the signal detection circuit is connected with the conductive metal piece and is used for collecting an electric signal on the conductive metal piece so as to detect the concentration of plasma generated by the plasma generator; and the main control module is respectively connected with the plasma generator and the plasma concentration detection sensor main body. Therefore, a plasma concentration detection scheme which is simple in structure, low in cost, easy to integrate and reliable in detection is obtained, and products such as an air purifier have a real-time monitoring function, so that the intelligent level of the products is improved, the purification effect is guaranteed, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of gas ionization technology, and in particular to a plasma concentration detection sensor and a gas ionization device. Background Technology

[0002] Plasma generators, as a highly efficient gas ionization unit, have been widely used in air purifiers, disinfection equipment, deodorizers, and industrial waste gas treatment. They generate plasma by applying high voltage between two electrodes to ionize the surrounding gas, and then use the highly active substances in the plasma to decompose pollutants, kill microorganisms, or adsorb particulate matter.

[0003] Taking air purifiers employing plasma air purification technology as an example, with the increasing prominence of air pollution, they are widely used in homes, offices, and industrial settings. These purifiers generate a large number of positive and negative ions that interact with bacteria, viruses, and odor molecules in the air, thereby purifying the air. During the operation of a plasma air purifier, the stability and effectiveness of the plasma concentration directly affect the purification effect. Therefore, whether the plasma concentration meets the standard becomes a crucial factor in the normal operation of the equipment and maintaining its purification efficiency.

[0004] Currently, plasma concentration sensors based on principles such as surface plasmon resonance (SPR), electrochemical sensing, and optical detection are available on the market. These sensors are typically designed as standalone instruments, with their electrode structures integrated inside the sensor body, and detection is performed by sampling air or the plasma generator of a corresponding air purifier. However, such standalone instruments have several significant problems when applied to air purifiers: First, traditional technology uses separate instruments to conduct spot checks on air purifiers, which cannot achieve real-time monitoring of air purifiers. If such a separate instrument is attached to the air purifier as a standalone unit, on the one hand, the cost of the separate instrument is high, and on the other hand, it requires additional installation space and fixing structure, which increases the size and complexity of the whole unit and also increases the assembly cost. For modern air purification products that pursue a thin and compact design, it is difficult to achieve integrated design.

[0005] Secondly, the electrodes of traditional sensors are usually encapsulated inside the sensor, which limits their detection sensitivity and response speed due to the physical barrier of the sensor housing. Especially in high-velocity air environments, the electrodes cannot directly contact the plasma, and the detection results are easily affected by airflow interference, impacting monitoring accuracy.

[0006] In addition, in high-humidity environments (such as the rainy season in the south, coastal areas, or specific industrial sites), moisture and dust mix and form a sticky, strongly adhering scale layer on the electrode surface of the plasma generator. This scale layer not only severely shields the electric field, causing a sharp drop in plasma generation efficiency and a reduction in purification function, but may also cause electrode corrosion due to uneven partial discharge, shortening the device's lifespan.

[0007] Therefore, a new technical solution needs to be researched to address the above problems. Summary of the Invention

[0008] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a plasma concentration detection sensor and a gas ionization device. It provides a plasma concentration detection solution that is simple in structure, low in cost, easy to integrate, and reliable in detection, enabling products such as air purifiers to achieve true built-in real-time monitoring functions, thereby improving the product's intelligence level, ensuring purification effect, and reducing maintenance costs.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: A gas ionization device with plasma concentration detection function includes: The casing contains air ducts. A plasma generator is installed inside the air duct; A conductive metal component is provided corresponding to the plasma emission area of ​​the plasma generator. The plasma concentration detection sensor body is set independently of the conductive metal component, and includes a signal detection circuit and a signal processing unit; the signal detection circuit is connected to the conductive metal component and is used to collect electrical signals on the conductive metal component to detect the plasma concentration generated by the plasma generator; The main control module is connected to the plasma generator and the plasma concentration detection sensor body, respectively.

[0010] As a preferred embodiment, the conductive metal component is fixed to the surface and interior of the housing by means of adhesive bonding, snap-fitting, or embedding.

[0011] As a preferred embodiment, the housing is an injection-molded part, and the conductive metal part is pre-embedded in the housing wall during the injection molding process to form an internal electrode structure; and an electrical connection point connected to the conductive metal part is exposed on the outer surface of the housing for the signal detection circuit to connect to.

[0012] As a preferred embodiment, the plasma concentration detection sensor body is mounted on the exterior of the housing corresponding to the conductive metal component.

[0013] As a preferred embodiment, the housing is provided with a positioning structure so that the plasma concentration detection sensor body is mounted on the positioning structure.

[0014] As a preferred embodiment, the plasma concentration detection sensor body is detachably mounted on the housing.

[0015] As a preferred embodiment, a filter screen is provided corresponding to the air duct, and a first vibration module is provided on the filter screen to shake off the dust on the filter screen.

[0016] As a preferred embodiment, the conductive metal component is electrically connected to the plasma concentration detection sensor body via a spring pin, conductive adhesive, or wire welding.

[0017] As a preferred embodiment, a second vibration module is provided on the side of the plasma generator, and the main control module is electrically connected to the second vibration module; The main control module is configured to control the vibration frequency and start / stop sequence of the second vibration module based on the plasma concentration data fed back by the plasma concentration detection sensor body, so as to loosen or remove the dust attached to the surface of the plasma generator.

[0018] A plasma concentration detection sensor, characterized in that it includes a conductive metal component and a plasma concentration detection sensor body disposed independently of the conductive metal component; The conductive metal component is used to correspond to the plasma emission area of ​​the plasma generator. The plasma concentration detection sensor body includes a signal detection circuit and a signal processing unit connected together; the signal detection circuit is connected to the conductive metal part and is used to collect electrical signals on the conductive metal part in order to detect the plasma concentration generated by the plasma generator. The signal processing unit is connected to a data output line for connecting to the main control device of the gas ionization device to transmit plasma concentration data; or, the plasma concentration detection sensor body further includes a wireless communication unit for wirelessly transmitting plasma concentration data with the gas ionization device.

[0019] Compared with existing technologies, this invention has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it is mainly based on the core concept of the conductive metal component being independent of the sensor body. This achieves a separation design between the electrodes and the sensor body of the plasma concentration detection sensor, allowing the sensor body to be produced in a standardized and modular manner. The conductive metal component can be flexibly arranged near the plasma generator, improving detection sensitivity and real-time performance while significantly reducing integration costs. This simple, low-cost, easy-to-integrate, and reliable plasma concentration detection solution enables products such as air purifiers to achieve truly built-in real-time monitoring capabilities, thereby improving product intelligence, ensuring purification effects, and reducing maintenance costs.

[0020] Secondly, a filter screen is provided corresponding to the air duct, and a first vibration module is provided on the filter screen to shake off the dust on the filter screen, which helps to reduce the dust accumulation on the surface of the plasma generator. Furthermore, based on the real-time plasma concentration monitoring function built into products such as air purifiers, a vibration module is set on the side of the plasma generator. The main control module controls the vibration frequency and start / stop sequence of the second vibration module according to the plasma concentration data fed back by the plasma concentration detection sensor, so as to loosen or fall off the dust attached to the surface of the plasma generator, thereby achieving efficient, adaptive, and low-damage dust removal.

[0021] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the air purifier according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the air purifier according to Embodiment 2 of the present invention; Figure 3 This is a partial structural diagram of an air purifier according to Embodiment 2 of the present invention (the main body of the plasma concentration detection sensor is mounted on the housing). Figure 4 This is a partial structural diagram of an air purifier according to Embodiment 2 of the present invention (the plasma concentration detection sensor body is separated from the housing). Figure 5 This is a cross-sectional view of an air purifier according to Embodiment 2 of the present invention (the main body of the plasma concentration detection sensor is mounted on the housing). Figure 6 This is an exploded view of the main body of the plasma concentration detection sensor according to Embodiment 2 of the present invention; Figure 7This is a partial structural diagram of an air purifier according to Embodiment 2 of the present invention (mainly used to show the arrangement of the plasma generator and the second vibration module). Figure 8 This is a cross-sectional view of an air purifier according to Embodiment 3 of the present invention (the main body of the plasma concentration detection sensor is mounted on the housing). Figure 9 This is a structural diagram of the plasma generator, second vibration module, heating module, and temperature detection module according to Embodiment 3 of the present invention; Figure 10 This is a schematic diagram of the air purifier according to Embodiment 4 of the present invention; Figure 11 This is a schematic diagram of the plasma concentration detection sensor body according to Embodiment 4 of the present invention.

[0023] Figure 12 This is an exploded view of the plasma concentration detection sensor according to Embodiment 5 of the present invention. Detailed Implementation

[0024] Please refer to Figures 1 to 12 As shown, it illustrates the specific structure of various embodiments of the present invention.

[0025] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] A gas ionization device with plasma concentration detection function, which is used in air purifiers, disinfection equipment, deodorizers and industrial waste gas treatment machines, etc., includes: a shell, a plasma generator, conductive metal parts, a plasma concentration detection sensor body, and a main control module.

[0027] The housing is typically made of plastic and has an internal air duct 103, which is actively guided by a fan 104. The housing includes a lower shell 101-1 and an upper shell 101-2. The air duct 103 is located between the lower shell 101-1 and the upper shell 101-2. A support plate 102 (or support frame) for placing the plasma generator 1 is provided on the lower shell 101-1.

[0028] The plasma generator 1 is disposed within the air duct 103; it is typically supported by two support plates 102 located below both ends of the plasma generator 1; both the support plates 102 and the plasma generator 1 maintain a distance from the upper housing 101-2. The plasma generator is a conventional ceramic electrode plasma generating tube used to generate plasma to purify the air.

[0029] The conductive metal component 300, serving as a sensing electrode, can be made of various conductive metals such as copper, iron, gold, and silver. Its material, size, and shape are not limited. It is positioned on the housing (specifically the upper housing 101-2) and corresponds to the plasma emission area of ​​the plasma generator 1, ensuring effective plasma sensing, improving detection accuracy and response speed, and avoiding signal attenuation due to improper positioning. For example, the conductive metal component 300 can be a thin copper sheet electrode with a thickness of 0.05 mm. The thickness is 0.5 mm, preferably, for example, 0.1 mm to 0.2 mm. It is bendable to adapt to the shape of the housing. This thickness range ensures good flexibility to adapt to complex curved housing surfaces, while guaranteeing sufficient conductivity and mechanical strength, balancing ease of processing and service life. The thin copper electrode is preferably made of copper or brass with a purity ≥99%. The shape of the thin copper electrode can be cut into rectangles, circles, or other shapes as needed, and its area can be designed according to the detection sensitivity requirements. To prevent surface oxidation, the surface of the thin copper sheet can be tin-plated, gold-plated, or coated with an anti-oxidation conductive coating.

[0030] The plasma concentration detection sensor body 200 is independently positioned from the thin copper electrode. The plasma concentration detection sensor body 200 is mounted on the housing (specifically, the upper housing 101-2) outside the thin copper electrode. Typically, a positioning structure (e.g., two connecting posts 1011 for connection and fixation via connecting holes 22 on the two lugs 21 of the upper housing 201) is provided on the housing to allow the plasma concentration detection sensor body 200 to be mounted on the positioning structure. The plasma concentration detection sensor body 200 is detachably mounted on the housing, facilitating future maintenance, replacement, or upgrades, while ensuring accurate alignment and preventing installation deviations from affecting detection performance. The plasma concentration detection sensor body 200 includes a signal detection circuit and a signal processing unit; the signal detection circuit is connected to the thin copper electrode and is used to collect the electrical signal on the thin copper electrode to detect the plasma concentration generated by the plasma generator; the signal detection circuit includes an impedance detection unit or a charge sensing unit, used to determine the plasma concentration based on the change in the electrical signal induced on the thin copper electrode; the thin copper electrode and the plasma concentration detection sensor body are electrically connected by a spring pin, conductive adhesive, or wire soldering, for example: 1. Spring pin connection method, in the plasma... 1. A spring pin is provided on the contact surface of the ion concentration detection sensor body. During installation, the spring pin is pressed against the preset solder pad or contact point of the thin copper electrode 5 to achieve elastic conductivity and facilitate disassembly; 2. Conductive adhesive connection method: Anisotropic conductive adhesive (ACP) or conductive double-sided tape is used to bond the contact point of the plasma concentration detection sensor body to the thin copper electrode, realizing the integration of physical fixation and electrical connection; 3. Welding connection method: The lead wire of the thin copper electrode is welded to the terminal of the plasma concentration detection sensor body through a wire. The connection is the most secure and reliable and is suitable for occasions where disassembly is not frequent. In specific implementation, the plasma concentration detection sensor body can be a packaged electronic module, including an upper shell 201, a circuit board assembly 202, and a lower shell 203. Alternatively, the lower shell can be removed, and the circuit board assembly 202 can be encapsulated by the upper shell 201. The circuit board assembly 202 mainly includes a signal detection circuit and a signal processing unit. The specific form of the signal detection circuit can be a high input impedance charge amplifier circuit used to detect the induced charge accumulated on the thin copper electrode; or it can be an AC impedance measurement circuit that reflects the plasma concentration by measuring the impedance change between the electrode and the reference ground. The signal processing unit typically includes an analog-to-digital converter (ADC), a microprocessor (such as an MCU), or a dedicated signal processing chip, used to filter, amplify, and calculate the acquired signal, and convert it into a standard format digital signal (such as PWM, UART, I2C signal) for output.

[0031] The main control module is connected to both the plasma generator and the plasma concentration detection sensor body. The plasma concentration detection sensor body and the main control module are connected via cables or connectors, or wirelessly via Bluetooth, to transmit power and signals. The plasma concentration detection sensor body detects changes in electrical signals (such as induced charge and impedance changes) generated on the thin copper electrode due to plasma action. After processing by internal circuitry, the signal characterizing the plasma concentration is sent to the air purifier's main control module, thereby achieving real-time, online plasma concentration monitoring.

[0032] like Figure 3 and Figure 4 As shown, the thin copper sheet electrode is fixed to the surface of the housing by pasting, snapping, or embedding. Its advantages are that it is flexible in modification, suitable for upgrading and adding to existing products, does not require modification of the mold, has low cost, and is quick to implement. In practice, a flat area is cleared on the inner (or outer) surface of the air purifier housing, corresponding to the working area of ​​the internal plasma generator. Using high-temperature resistant double-sided conductive tape or structural adhesive, a pre-cut thin copper electrode is adhered and fixed to this area, ensuring a firm bond without air bubbles. Then, a short section of the end of the thin copper electrode is extended as an electrode lead, which can be led out of the housing through a small wire hole (if attached to the inside of the housing) or left directly on the outside. Next, a sensor mounting base is designed on the outside of the housing corresponding to the position of the thin copper electrode. The plasma concentration detection sensor body is embedded or snapped into the mounting base. The position of the plasma concentration detection sensor body is adjusted so that its built-in spring pin connector aligns with the lead or contact point of the thin copper electrode, and then locked in place to ensure a reliable electrical connection. Finally, the output cable of the plasma concentration detection sensor body is connected to the corresponding interface on the air purifier's main control board. After power-on, the MCU of the main control module reads the signal from the plasma concentration detection sensor body, thus monitoring the plasma concentration in real time.

[0033] Regarding the placement of the conductive metal component inside the housing, this is not limited to the methods described above. Another embodiment is provided here: the conductive metal component is placed on the plasma generator. Typically, the plasma generator (also called a plasma tube) has insulating ends (e.g., made of plastic or silicone) at one or both ends of the tube body. The conductive metal component can be placed on the outer peripheral side or outer end face of the insulating end. One end of the conductive metal component extends into the insulating end for fixation, while the other end protrudes from the outer surface of the insulating end for electrical connection to the signal detection circuit of the plasma concentration detection sensor. Because the conductive metal component is located on the plasma generator, the detection sensitivity and response speed are greatly improved. Compared to other arrangements further away from the plasma generator, in this embodiment, the size of the conductive metal component can be designed to be smaller, thus meeting the detection requirements. Furthermore, the addition of the conductive metal component does not interfere with the plasma generator and is easy to implement.

[0034] like Figure 8 As shown, the housing is an injection-molded part. The thin copper electrode is pre-embedded in the housing wall during the injection molding process, forming an internal electrode structure. Furthermore, electrical connection points connected to the thin copper electrode are exposed on the outer surface of the housing for connection to the signal detection circuit. By pre-embedding the thin copper electrode in the injection-molded housing, the electrode and housing are integrally formed, reducing assembly steps, improving structural strength and aesthetics, eliminating the need for separate electrode attachment, resulting in good production consistency and long-term reliability. In practice, when designing the injection mold for the air purifier housing, a slot or positioning pin is designed in the cavity corresponding to the position of the plasma generator to fix the thin copper electrode. The pre-cut thin copper electrode is placed in the designated position in the mold. Then, the mold is closed and injection molding is performed. The molten plastic will cover most of the thin copper electrode, leaving only one or more specific contact areas (such as a circular pad or strip contact) exposed on the surface or inner groove of the molded housing. The thin copper electrode is firmly embedded in the housing wall, becoming part of the housing structure. After the housing is demolded, the contact area of ​​the thin copper electrode is in place. In subsequent assembly, the plasma concentration detection sensor body only needs to be aligned with this contact area and fixed, and connected to it with spring pins or conductive adhesive.

[0035] Furthermore, a filter screen 105 is provided corresponding to the air duct 103, and a first vibration module 400 connected to the main control module 5 is provided on the filter screen 105 to shake off the dust on the filter screen 105.

[0036] Next, we will briefly introduce the working process of an air purifier: After the air purifier is turned on, the plasma generator 1 starts working, generating a high concentration of positive and negative ions. These ions diffuse under the airflow of the duct 103, and some ions reach the surface of the thin copper electrode. Due to the charged characteristics of the ions, charges are induced on the thin copper electrode, or the electric field distribution between it and the reference ground is changed, resulting in changes in the electrical parameters of the thin copper electrode (such as ground potential and impedance). The signal detection circuit in the plasma concentration detection sensor body 200 collects this changing electrical signal in real time. The signal processing unit processes and analyzes the signal to calculate the corresponding plasma concentration value. This concentration value is generally transmitted to the MCU of the air purifier's main control module 5 in the form of a digital signal. The MCU can determine whether the plasma generator 1 is working properly based on this concentration value, and can stabilize the plasma concentration by adjusting the power of the plasma generator 1, or prompt the user for maintenance when the service life is approaching or the concentration is insufficient.

[0037] If the plasma concentration is insufficient, it may be due to dust accumulation on the surface of plasma generator 1 during maintenance. Therefore, dust removal treatment is required for plasma generator 1.

[0038] Furthermore, an automatic dust removal solution is provided for the plasma generator 1 on the air purifier. This solution can automatically adjust according to environmental conditions and achieve non-destructive and efficient cleaning through the coordinated action of multiple modules, thus proactively, intelligently, and efficiently addressing the problem of dust caking in the plasma generator under high humidity conditions. A second vibration module 2 is disposed on the side of the plasma generator 1, and the main control module 5 is electrically connected to the second vibration module 2. The main control module 5 is configured to control the vibration frequency and start / stop sequence of the second vibration module 2 based on the plasma concentration data fed back by the plasma concentration detection sensor body 200, so as to loosen or remove the dust attached to the surface of the plasma generator 1. The first vibration module 400 and the second vibration module 2 can be miniature vibration motors or piezoelectric ceramic vibrators, also known as miniature vibrators. Miniature vibration motors or piezoelectric ceramic vibrators are small in size, have fast response, and adjustable vibration frequency, making them suitable for integration with the plasma generator to achieve precise vibration dust removal. Preferably, the vibration direction of the second vibration module 2 is configured to be parallel to or at an acute angle to the ceramic electrode surface of the plasma generator 1 to maximize the transmission of shear force, which is beneficial to optimizing vibration transmission efficiency, promoting the peeling of attached substances, and improving the dust removal effect. In specific implementation, the vibration module 2 is mounted on a support plate 102 to be located on the side of the plasma generator 1.

[0039] Furthermore, a heating module is provided inside the plasma generator 1. This heating module can be a heating wire, a PTC heating element, or a thin-film heating element, providing uniform and controllable heating and effectively reducing dust adhesion. Specifically, a PTC heating element can be arranged axially inside the plasma generator 1 as the heating module. For example, the PTC heating element can be tightly attached to the inner wall of the plasma generator to ensure that heat is evenly transferred to the entire tube wall. Additionally, a temperature detection module is provided in the heating area of ​​the plasma generator 1. This temperature detection module can be an NTC thermistor, a thermocouple, or a digital temperature sensor. Specifically, an NTC thermistor is attached as the temperature detection module at the center of the area with the most concentrated heating on the inner or outer wall of the plasma generator to monitor the tube wall temperature in real time. The main control module 5 is electrically connected to the second vibration module 2, the heating module 3, and the temperature detection module 4, respectively. The main control module 5 is configured to control the heating temperature of the heating module 3 and the vibration frequency and start / stop sequence of the vibration module 2 based on real-time ambient humidity data (which can be sourced from online weather forecast data or the humidity detection module configured in the air purifier), so as to loosen or remove dust adhering to the surface of the plasma generator 1. In other words, the main control module has a humidity compensation function, which can automatically adjust heating and vibration parameters according to humidity to achieve adaptive dust removal, improving energy efficiency and dust removal effect. The main control module 5 includes a microcontroller unit (MCU), which pre-stores or calculates in real-time target values ​​for heating temperature and vibration frequency that match different ambient humidity values. For example, the control logic of the main control module 5 is: it stores a table of correspondences between humidity, temperature, and vibration frequency based on experimental data. When the dust removal program is started, the MCU directly looks up the table to obtain the optimal temperature and frequency combination under the current humidity, achieving more precise and efficient adaptive control. Under the combined effects of heating and vibration, and with the use of fan 104, the dust on the surface of the plasma generator 1 is further blown off thoroughly, improving the dust removal capability. During dust removal, the wind speed of fan 104 can be maintained at normal or adjusted to increase; the increased wind speed results in better dust removal.

[0040] The main control module 5 is also used to perform closed-loop adjustment of the heating power of the heating module 3 based on the feedback signal from the temperature detection module 4, so as to maintain the temperature within the set range, ensure accurate and reliable temperature monitoring, and provide real-time feedback for heating control. It has a closed-loop temperature control function to avoid overheating or underheating, improving safety and reliability. In specific implementation, the main control module 5 can be a microcontroller unit (MCU) with ADC and PWM output functions, and the vibration module, PTC heating element, and NTC thermistor are all electrically connected to the corresponding input / output interfaces of the MCU.

[0041] Thus, addressing the problem of dust easily caking and adhering to the surface of ion tubes in humid environments, this method uses low-temperature heating to evaporate moisture, reducing dust adhesion. A micro-vibrator generates a vibration frequency matched to the dust adhesion force, causing the dust to detach from the electrode surface, achieving dust removal. Therefore, based on real-time intelligent control of heating and vibration according to ambient humidity, it fundamentally overcomes the technical challenge of dust caking and adhesion in high-humidity environments, achieving efficient, adaptive, and low-damage dust removal.

[0042] Next, the dust removal process of the plasma generator will be briefly described as follows: After the air purifier is turned on, the main control module 5 continuously monitors the ambient humidity (RH) and dust level in real time. When the plasma concentration is insufficient, the main control module 5 determines that a dust removal program needs to be initiated. First, the main control module 5 activates the heating module 3 and performs humidity compensation based on the current ambient humidity: the higher the humidity, the higher the set target heating temperature. The NTC thermistor provides real-time feedback on the tube wall temperature, and the MCU adjusts the input power of the PTC heating element through a PID algorithm to stabilize the temperature near the target value. Low-temperature heating evaporates the moisture in the adhering dust, reducing its stickiness and adhesion. After the temperature reaches the target value and stabilizes for a period of time, the main control module 5 activates the vibration module 2. The vibration frequency is also compensated for based on humidity; the higher the humidity, the higher the initially set vibration frequency to counteract stronger adhesion. The micro vibration motor starts working, generating mechanical vibration at a specific frequency, which is transmitted through the tube wall to the surface of the ceramic electrode. Under the combined action of heat and vibration shear force, the originally caked and adhered dust layer becomes loose and falls off the surface. The dust removal program automatically stops after running for one preset cycle, and the device resumes normal plasma generation. If the plasma concentration is still insufficient, the dust removal program is restarted. Typically, one dust removal cycle is sufficient to achieve the required plasma concentration; therefore, it is rarely necessary to adjust the plasma generator's power to stabilize the plasma concentration. If the plasma concentration is still insufficient after a second dust removal cycle, the main control module will adjust the plasma generator's power to stabilize the plasma concentration and issue an alarm to prompt the user to arrange further maintenance and repair.

[0043] In another embodiment, a dust sensor is also included, electrically connected to the main control module 5, for detecting the dust adhesion status on the surface of the plasma generator 1. The added dust sensor enables real-time monitoring of the dust adhesion status, giving the system direct sensing capability of pollution levels. This makes the triggering and termination of dust removal actions more precise and energy-efficient, resulting in more accurate and intelligent dust removal control, evolving from timed or humidity-based triggering to on-demand triggering. After the device is powered on, the main control module 5 continuously reads data from the humidity sensor 6 and the dust sensor. When the ambient humidity is detected to be higher than a preset threshold and the dust sensor data indicates that the surface deposits on the plasma generator have reached a certain concentration, even though the plasma concentration meets the standard, the main control module 5 determines that the dust removal program needs to be started. The program stops early when the dust sensor detects that the deposit concentration has dropped below the threshold, thus preventing excessive dust accumulation. In specific implementation, an infrared photosensitive dust sensor can be installed on the windward side of the plasma generator to detect the approximate dust adhesion concentration on the plasma generator surface.

[0044] In another embodiment, a power supply module is also included to supply power to the vibration module 2, the heating module 3, the temperature detection module 4, and the main control module 5. The power supply module provides a stable DC voltage to the entire device, for example, converting 220V AC to 5V and 3.3V DC, ensuring stable power supply for the entire device and making it suitable for integration into various electrical appliances. Of course, voltage conversion can also be performed based on the power supply requirements of the product in the application scenario.

[0045] like Figure 12 As shown, a plasma concentration detection sensor is also provided, including a conductive metal part 300 and a plasma concentration detection sensor body 200 disposed independently of the conductive metal part 300. The conductive metal component 300 is used to correspond to the plasma emission area of ​​the plasma generator. The plasma concentration detection sensor body 200 includes an upper shell 201 and a circuit board assembly 202. As described above, the circuit board assembly 202 is provided with a connected signal detection circuit and a signal processing unit. The signal detection circuit is connected to the conductive metal part 300 and is used to collect the electrical signal on the conductive metal part 300 to detect the plasma concentration generated by the plasma generator. The signal processing unit is connected to a data output line for connecting to the main control device of the gas ionization device to transmit plasma concentration data; or, the plasma concentration detection sensor body further includes a wireless communication unit for wirelessly transmitting plasma concentration data with the gas ionization device.

[0046] This plasma concentration detection sensor can be applied to gas ionization devices such as air purifiers, disinfection equipment, deodorizers, and industrial waste gas treatment machines, serving as an upgrade technology for these devices. When designing and manufacturing these gas ionization devices, the addition of a plasma concentration detection sensor can be considered. For example, reserving space for conductive metal components and the main body of the plasma concentration detection sensor. This requires local modifications to improve the overall integration of the plasma concentration detection sensor and the gas ionization device. Alternatively, the original gas ionization device design can be left unchanged, with conductive metal components added directly to the outside of the device (corresponding to the plasma emission area of ​​the plasma generator), and the main body of the plasma concentration detection sensor installed near these components. The main body of the plasma concentration detection sensor can then be connected to the main controller of the gas ionization device via wired or wireless means.

[0047] The key design feature of this invention lies in its core concept of separating the thin copper electrode from the main sensor body. This separation allows for standardized and modular production of the sensor body, while the thin copper electrode can be flexibly positioned near the plasma generator, improving detection sensitivity and real-time performance while significantly reducing integration costs. This simple, low-cost, easily integrated, and reliable plasma concentration detection solution enables air purifiers and other products to achieve true built-in real-time monitoring capabilities, thereby enhancing product intelligence, ensuring purification effectiveness, and reducing maintenance costs.

[0048] Secondly, a filter screen is provided corresponding to the air duct, and a first vibration module is provided on the filter screen to shake off the dust on the filter screen, which helps to reduce the dust accumulation on the surface of the plasma generator. Furthermore, based on the real-time plasma concentration monitoring function built into products such as air purifiers, a vibration module is set on the side of the plasma generator. The main control module controls the vibration frequency and start / stop sequence of the second vibration module according to the plasma concentration data fed back by the plasma concentration detection sensor, so as to loosen or fall off the dust attached to the surface of the plasma generator, thereby achieving efficient, adaptive, and low-damage dust removal.

[0049] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A gas ionization device with plasma concentration detection function, characterized in that, include: The casing contains air ducts. A plasma generator is installed inside the air duct; A conductive metal component is provided corresponding to the plasma emission area of ​​the plasma generator. The plasma concentration detection sensor body is disposed independently of the conductive metal component, and includes a connected signal detection circuit and a signal processing unit; the signal detection circuit is connected to the conductive metal component and is used to collect electrical signals on the conductive metal component to detect the plasma concentration generated by the plasma generator; The main control module is connected to the plasma generator and the plasma concentration detection sensor body, respectively.

2. The gas ionization device with plasma concentration detection function according to claim 1, characterized in that: The conductive metal parts are fixed to the surface and interior of the housing by means of pasting, snap-on or embedding.

3. The gas ionization device with plasma concentration detection function according to claim 1, characterized in that: The housing is an injection-molded part, and the conductive metal part is embedded in the housing wall during the injection molding process to form an internal electrode structure; and an electrical connection point connected to the conductive metal part is exposed on the outer surface of the housing for the signal detection circuit to connect to.

4. The gas ionization device with plasma concentration detection function according to claim 1, characterized in that: The plasma concentration detection sensor body is mounted on the outside of the housing corresponding to the conductive metal part.

5. The gas ionization device with plasma concentration detection function according to claim 4, characterized in that: The housing is provided with a positioning structure so that the plasma concentration detection sensor body is mounted on the positioning structure.

6. The gas ionization device with plasma concentration detection function according to claim 5, characterized in that: The plasma concentration detection sensor body is detachably mounted on the housing.

7. The gas ionization device with plasma concentration detection function according to claim 1, characterized in that: A filter screen is provided corresponding to the air duct, and a first vibration module is provided on the filter screen to shake off the dust on the filter screen.

8. The gas ionization device with plasma concentration detection function according to claim 1, characterized in that: The conductive metal component is electrically connected to the plasma concentration detection sensor body via a spring pin, conductive adhesive, or wire welding.

9. The gas ionization device with plasma concentration detection function according to claim 1, characterized in that: A second vibration module is provided on the side of the plasma generator, and the main control module is electrically connected to the second vibration module. The main control module is configured to control the vibration frequency and start / stop sequence of the second vibration module based on the plasma concentration data fed back by the plasma concentration detection sensor body, so as to loosen or remove the dust attached to the surface of the plasma generator.

10. A plasma concentration detection sensor characterized by: It includes a conductive metal component and a plasma concentration detection sensor body disposed independently of the conductive metal component; The conductive metal component is used to correspond to the plasma emission area of ​​the plasma generator. The plasma concentration detection sensor body includes a signal detection circuit and a signal processing unit connected together; the signal detection circuit is connected to the conductive metal part and is used to collect electrical signals on the conductive metal part in order to detect the plasma concentration generated by the plasma generator. The signal processing unit is connected to a data output line for connecting to the main control device of the gas ionization device to transmit plasma concentration data; or, the plasma concentration detection sensor body further includes a wireless communication unit for wirelessly transmitting plasma concentration data with the gas ionization device.

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