Automobile air conditioner filter

Abstract

The invention discloses an automobile air conditioner filter which comprises an outer frame and a filter element, the filter element comprises a piezoelectric ceramic vibrating reed, a mounting aluminum plate, a rubber pad, a nylon grid support and a filter inner core, the filter inner core is mounted in a mounting cavity of the nylon grid support, and the rubber pad is fixed to the bottom of the nylon grid support. And the mounting aluminum plate and the piezoelectric ceramic vibrating plate are sequentially fixed at the bottom of the rubber pad. The self-cleaning filter element has the beneficial effects that in-situ self-cleaning of the filter element is realized, dust is vibrated off through high-frequency vibration of the piezoelectric ceramic vibrating reed, the filter element is prevented from being blocked, good filtering performance is maintained, and the service life is prolonged; power consumption is low, and energy consumption is reduced by utilizing the characteristics of the piezoelectric ceramic vibrating reed; efficient transmission of vibration energy is guaranteed, and the mounting aluminum plate and the rubber pad act synergistically, so that the dust removal effect is optimal; and the structure is compact and reasonable, all parts are stably connected, the fault probability is reduced, and the service life of the filter is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of automobile air-conditioning systems, in particular to an automobile air-conditioning filter, in particular to a piezoelectric ceramic vibration type automobile air-conditioning filter with a self-cleaning function. Background Art

[0002] In the automotive air conditioning system, the air conditioning filter plays a vital role. Its performance directly affects the air quality in the car and the operating efficiency of the air conditioning system. Traditional automotive air conditioning filters mostly use multi-layer filter media, such as non-woven fabrics, activated carbon, HEPA filters, etc., to intercept impurities in the air by passive filtering. However, this filtering method has obvious disadvantages. During use, the filter element is very easy to accumulate dust and cannot be automatically cleaned. When the dust accumulates to a certain extent, it will cause the filter element to be blocked, which will seriously affect the normal operation of the air conditioning system.

[0003] In addition, PM2.5 particles in the air are very small and can easily embed into the pores of filter fibers. As the number of embedded particles increases, the air circulation resistance of the air conditioning system increases. In order to maintain normal air supply, the air conditioning system has to increase the fan speed, which undoubtedly leads to an increase in the energy consumption of the air conditioning system.

[0004] In order to solve the dust accumulation problem of the air conditioning filter element and make the filter have a dust cleaning effect, many attempts have been made in the prior art. For example, patent CN201810345678.8 uses an eccentric wheel vibration device to achieve filter element cleaning. However, this solution has the problem of large energy loss. A large amount of energy is wasted during the operation of the eccentric wheel. At the same time, its structure is complex and a reduction motor needs to be configured, which not only increases the system cost, but also affects the stability and reliability of the entire device.

[0005] In summary, the field of automotive air conditioning filters urgently needs to develop a new filter structure that can achieve in-situ self-cleaning of the filter element under low power consumption conditions, while ensuring efficient transmission of vibration energy and ensuring the stability of system operation, so as to overcome the many shortcomings of existing filters. Summary of the invention

[0006] In view of the deficiencies in the background technology, the present invention provides an automobile air conditioning filter.

[0007] The technical solution adopted by the present invention is: an automobile air conditioning filter, comprising an outer frame and a filter element spaced apart in the outer frame, the filter element comprising a piezoelectric ceramic vibrating plate, a mounting aluminum plate, a rubber pad, a nylon mesh bracket and a filter inner core, the filter inner core is installed in the mounting cavity of the nylon mesh bracket, the rubber pad is fixed to the bottom of the nylon mesh bracket, the mounting aluminum plate is fixed to the bottom of the rubber pad, and the piezoelectric ceramic vibrating plate is fixed to the bottom of the rubber pad.

[0008] Furthermore, a plurality of micropores communicating with the installation cavity and notch openings in the shape of equilateral hexagons are evenly distributed on the nylon mesh bracket. The aperture of the micropores is 1-2 mm, and the flow area of the notch openings is 10-20 times that of the micropores.

[0009] Furthermore, it further includes a pressing frame made of nickel-titanium shape memory alloy. The pressing frame is in a "冂"-shaped structure. Card slots for the two ends of the filter element to be inserted are provided on both sides of the outer frame body. Connection grooves are provided on both sides of the card slots. The connecting feet of the pressing frame are in a wavy structure, and the connecting feet are elastically deformed and inserted into the above-mentioned connection grooves.

[0010] Furthermore, the wavelength of the connecting feet is 8-12 mm, and the wave height is 2.5-3.5 mm. The nickel-titanium shape memory alloy pressing frame has been pre-deformed. When the temperature is higher than 40 °C, it returns to a flat state, generating a linear pressing force of 2-2.5 N / mm; when the temperature is lower than 45 °C, it presents a wavy shape, and maintains a basic pressing force of 0.5-1 N / mm through the superelastic effect.

[0011] Furthermore, the interference fit amount of the connection groove is 0.1-0.3 mm, and the inner wall of the connection groove is coated with a polytetrafluoroethylene anti-friction layer, and the thickness of the polytetrafluoroethylene anti-friction layer is 40-45 μm.

[0012] Furthermore, it further includes a DC / DC boost module, whose input end is electrically connected to the vehicle-mounted 12V power supply, and is used to boost the input voltage to 130V ± 5% DC; an H-bridge inverter, whose input end is electrically connected to the output end of the DC / DC boost module, and is used to convert direct current into 200Hz alternating current; a PWM control module, whose signal output end is connected to the drive port of the H-bridge inverter, and is used to generate a 200Hz square wave control signal; an overvoltage protection module, whose voltage sampling end is connected in parallel to the output end of the DC / DC boost module, and cuts off the circuit when it detects that the output voltage exceeds 130V; The output end of the H-bridge inverter is electrically connected to the two electrodes of the piezoelectric ceramic vibrating piece.

[0013] Furthermore, under the drive of the PWM control module, the piezoelectric ceramic vibrating piece vibrates at a frequency of 200 Hz. The power consumption of a single vibrating piece is 0.5 ± 0.05 W, and the vibration amplitude range is 10-15 μm; the overvoltage protection module is set with a voltage threshold of 130V. When the output voltage of the DC / DC boost module exceeds 130V, the overvoltage protection module cuts off the power supply circuit of the H-bridge inverter.

[0014] Furthermore, the PWM control module of the H-bridge inverter is integrated with a vibration frequency adaptive algorithm, which dynamically adjusts the output frequency according to the PM2.5 concentration signal (input range 0-500μg / m³) of the vehicle air quality sensor: When PM2.5≤75μg / m³, maintain the base frequency of 200Hz; When PM2.5>75μg / m³, the frequency increases by 5Hz for every 50μg / m³ increase, up to 250Hz; After the frequency is increased, the amplitude of the piezoelectric ceramic vibration piece is stabilized at 10-15μm through voltage feedback closed-loop control, and the power consumption does not exceed 0.5±0.05W±10%.

[0015] The beneficial effects of the present invention are: First, the filter element has an in-situ self-cleaning function. The uniquely designed piezoelectric ceramic vibrator can generate high-frequency vibrations during operation. This vibration can autonomously, timely, and efficiently shake off the dust attached to the filter element, avoiding dust accumulation that causes filter element blockage and avoiding large amounts of dust accumulation on the filter element surface, thereby ensuring that the filter always maintains good filtering performance and extends its service life.

[0016] Secondly, it performs well in terms of low power consumption. Compared with existing filters that use eccentric wheel vibration devices and other cleaning methods, this patent uses the characteristics of piezoelectric ceramic vibration plates, which only consume very little electricity to produce effective vibrations during operation, significantly reducing energy consumption. This not only helps to reduce the overall energy consumption of the vehicle and reduce the cost of use, but also conforms to the current development trend of energy conservation and environmental protection.

[0017] Furthermore, it ensures the efficient transmission of vibration energy. The synergistic effect of the installed aluminum plate and the rubber pad provides a good channel for the vibration energy generated by the piezoelectric ceramic vibrating plate to be transmitted to the filter core. The rubber pad can not only play a buffering role to prevent vibration from damaging other components, but also effectively transmit the vibration energy to the nylon mesh bracket and the filter core, ensuring that the vibration energy is minimally lost during the transmission process, so that the dust cleaning effect is optimal.

[0018] Finally, the system operation stability is improved. The entire filter structure is compact and reasonable, and the connections between the components are stable. The nylon grid bracket provides reliable support for the filter core, and the rubber pad further enhances the stability of the structure, reducing the possibility of loosening or damage of components due to vibration and other factors. At the same time, low power consumption and efficient vibration energy transmission also make the system more stable and reliable during long-term operation, reduce the probability of failure, and extend the service life of the filter.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 for Figure 1 Enlarged schematic diagram at point A in the middle.

[0022] Figure 3 Schematic diagram of the filter element structure.

[0023] Figure 4 A partial schematic diagram of the clamping frame.

[0024] Figure 5 The connection diagram of the present invention is Figure 1-5 In: 1. Outer frame; 2. Filter element; 3. Piezoelectric ceramic vibrating plate; 4. Mounting aluminum plate; 5. Rubber pad; 6. Nylon grid bracket; 7. Filter inner core; 8. Mounting cavity; 9. Micropores; 10. Notch; 11. Pressing frame; 12. Slot; 13. Connecting groove; 14. Polytetrafluoroethylene anti-friction layer; 15. Connecting foot. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] The invention provides an automobile air conditioning filter.

[0028] In this embodiment, refer to Figure 1-5, the automotive air filter includes an outer frame 1 and a filter element 2 disposed at intervals within the outer frame. The filter element 2 includes a piezoelectric ceramic vibrating plate 3, a mounting aluminum plate 4, a rubber pad 5, a nylon mesh bracket 6, and a filter core 7. The filter core is installed within the installation cavity 8 of the nylon mesh bracket. The rubber pad is fixed to the bottom of the nylon mesh bracket. The mounting aluminum plate is fixed to the bottom of the rubber pad. The piezoelectric ceramic vibrating plate is fixed to the bottom of the rubber pad.

[0029] In the above technical solution, the piezoelectric ceramic vibrating plate, the mounting aluminum plate, the rubber pad, the nylon mesh bracket, and the filter core are combined. The filter core is placed within the installation cavity of the nylon mesh bracket. The rubber pad connects the nylon mesh bracket with the mounting aluminum plate and the piezoelectric ceramic vibrating plate. This connection method aims to utilize the vibration generated by the piezoelectric ceramic vibrating plate and transmit it through the rubber pad to the nylon mesh bracket and the filter core, realizing the self-cleaning function of the filter element.

[0030] Among them, the nylon mesh bracket can be injection molded from PA66 with a Shore hardness D80. The rubber pad is double-sided coated with silicone adhesive for connection with the mounting aluminum plate and the nylon mesh bracket.

[0031] Specifically, a number of micropores 9 communicating with the installation cavity and notch openings 10 in the shape of equilateral hexagons are evenly distributed on the nylon mesh bracket. The aperture of the micropores is 1 - 2 mm, and the flow area of the notch openings 10 is 10 - 20 times that of the micropores.

[0032] In this embodiment, the micropores and notch openings provided on the nylon mesh bracket have a micropore aperture of 1 - 2 mm, and the flow area of the notch openings is 10 - 20 times that of the micropores. Such a design ensures on the one hand that air can enter the installation cavity through the micropores to contact the filter core, realizing the filtering function; on the other hand, the notch openings with a larger flow area contribute to improving the air flow efficiency, and at the same time, during vibration cleaning, it is convenient for dust and other impurities to be discharged from the notch openings. The air flow path is optimized, improving the filtering efficiency while enhancing the smoothness of dust discharge during vibration cleaning, and further enhancing the overall performance of the filter.

[0033] Specifically, it further includes a compression frame 11 made of nickel-titanium shape memory alloy. The compression frame is in a "冂" shape structure. On both sides of the outer frame 1, there are card slots 12 for the two ends of the filter element 2 to be inserted. On both sides of the card slots, there are connection slots 13. The connection feet 15 of the compression frame 11 are in a wavy structure, and the connection feet are elastically deformed and inserted into the above connection slots.

[0034] In this embodiment, a compression frame in a "冂" shape structure is made of nickel-titanium shape memory alloy, and card slots and connection slots are provided on the outer frame. The connection feet of the compression frame are in a wavy structure. Utilizing the characteristics of nickel-titanium shape memory alloy, it is elastically deformed and inserted into the connection slots to realize the compression and fixation of the filter element.

[0035] This embodiment provides a reliable fixing method that can adaptively adjust the pressing force according to temperature changes, ensuring that the filter element can be stably installed in the outer frame at different ambient temperatures.

[0036] Specifically, the wavelength of the connecting pin is 8-12mm, and the wave height is 2.5-3.5mm. The nickel-titanium shape memory alloy clamping frame is pre-deformed and returns to a flat state when the temperature is higher than 40°C, generating a linear clamping force of 2-2.5N / mm; it is wavy when the temperature is lower than 45°C, and maintains a basic clamping force of 0.5-1N / mm through the superelastic effect.

[0037] In this embodiment, the connecting foot has a specific wavelength (8-12mm) and wave height (2.5-3.5mm), and the nickel-titanium shape memory alloy clamping frame is pre-deformed. When the temperature is higher than 40°C, the alloy returns to a flat state, generating a linear clamping force of 2-2.5N / mm; when the temperature is lower than 45°C, it is wavy, and maintains a basic clamping force of 0.5-1N / mm through the superelastic effect. This temperature response characteristic is based on the phase change principle of nickel-titanium shape memory alloy. Accurate and reasonable clamping force adjustment of the filter element in different temperature ranges is achieved. Providing a larger clamping force at high temperature to ensure stability, and maintaining a certain basic clamping force at low temperature, which not only ensures that the filter element is installed firmly, but also adapts to temperature changes and extends the service life of the filter.

[0038] Specifically, the interference fit amount of the connection groove is 0.1-0.3 mm, and the inner wall of the connection groove is coated with a polytetrafluoroethylene anti-friction layer 14, and the thickness of the polytetrafluoroethylene anti-friction layer is 40-45 μm.

[0039] In this embodiment, the connection groove is provided with an interference fit of 0.1-0.3 mm, and the inner wall is coated with a polytetrafluoroethylene anti-friction layer 14 with a thickness of 40-45 μm. The interference fit ensures the tightness of the connection between the clamping frame connection foot and the connection groove, and the polytetrafluoroethylene anti-friction layer reduces the friction of the connection foot during the embedding and temperature change caused deformation process. The reliability of the connection between the clamping frame and the outer frame is improved, the wear caused by friction is reduced, the service life of the connection parts is extended, and the stability of the filter structure is further enhanced.

[0040] Specifically, it also includes A DC / DC boost module, whose input end is electrically connected to the vehicle-mounted 12V power supply and is used to boost the input voltage to 130V±5% DC; An H-bridge inverter, whose input end is electrically connected to the output end of the DC / DC boost module, for converting direct current into 200 Hz alternating current; A PWM control module, whose signal output terminal is connected to the driving port of the H-bridge inverter, for generating a 200 Hz square wave control signal; An overvoltage protection module, whose voltage sampling terminal is connected in parallel to the output terminal of the DC / DC boost module, cuts off the circuit when it detects that the output voltage exceeds 130V; The output end of the H-bridge inverter is electrically connected to two electrodes of the piezoelectric ceramic vibrating piece.

[0041] In this embodiment, the vehicle-mounted 12V power supply is boosted to 130V±5% DC by the DC / DC boost module, the H-bridge inverter converts DC power into 200Hz AC power, the PWM control module generates a 200Hz square wave control signal to drive the H-bridge inverter, and the overvoltage protection module monitors the output voltage of the DC / DC boost module in real time, and cuts off the circuit when it exceeds 130V. The entire circuit system works together to provide a suitable driving power supply and control signal for the piezoelectric ceramic vibrating piece.

[0042] This solution provides a stable and appropriate power supply and control for the piezoelectric ceramic vibrator, ensuring that it can work at the set frequency and voltage to achieve efficient vibration cleaning function. At the same time, the overvoltage protection module ensures the safety of the circuit system.

[0043] Specifically, the piezoelectric ceramic vibration piece vibrates at a frequency of 200Hz under the drive of the PWM control module, the power consumption of a single vibration piece is 0.5±0.05W, and the vibration amplitude range is 10-15μm; the overvoltage protection module is set with a 130V voltage threshold. When the output voltage of the DC / DC boost module exceeds 130V, the overvoltage protection module cuts off the power supply circuit of the H-bridge inverter.

[0044] Driven by the PWM control module, the piezoelectric ceramic vibrator vibrates at a frequency of 200Hz. The power consumption of a single vibrator is 0.5±0.05W, and the vibration amplitude range is 10-15μm. The overvoltage protection module sets a 130V voltage threshold. Once the output voltage of the DC / DC boost module exceeds this threshold, the H-bridge inverter power supply circuit is immediately cut off. The low power consumption and stable vibration of the piezoelectric ceramic vibrator are achieved, ensuring efficient dust cleaning effect. The overvoltage protection mechanism effectively avoids damage to the vibrator and circuit system due to excessive voltage, and improves the reliability and safety of the entire filter system.

[0045] Specifically, the PWM control module of the H-bridge inverter is integrated with a vibration frequency adaptive algorithm, which dynamically adjusts the output frequency according to the PM2.5 concentration signal (input range 0-500μg / m³) of the vehicle air quality sensor: When PM2.5≤75μg / m³, maintain the base frequency of 200Hz; When PM2.5>75μg / m³, the frequency increases by 5Hz for every 50μg / m³ increase, up to 250Hz; After the frequency is increased, the amplitude of the piezoelectric ceramic vibration piece is stabilized at 10-15μm through voltage feedback closed-loop control, and the power consumption does not exceed 0.5±0.05W±10%.

[0046] The PM2.5 concentration signal is obtained in real time through the on-board air quality sensor, and the output frequency is adjusted dynamically according to the concentration. When the PM2.5 concentration is at a low level (≤75μg / m³), maintaining a base frequency of 200Hz can not only ensure the basic cleaning effect of the filter, but also avoid the extra energy consumption and component loss caused by unnecessary high-frequency vibration. When the PM2.5 concentration increases (>75μg / m³), the frequency is increased by 5Hz for every increase of 50μg / m³, up to 250Hz, which can timely enhance the vibration frequency of the piezoelectric ceramic vibrating plate for highly polluted environments. The higher vibration frequency greatly improves the self-cleaning ability of the filter element, and more efficiently shakes off the dust and PM2.5 particles attached to the filter element, ensuring that the filter can still maintain good filtering performance in a severely polluted environment and provide continuous clean air in the car.

[0047] While the frequency is increased, the voltage feedback closed-loop control is used to stabilize the amplitude of the piezoelectric ceramic vibrating plate at 10-15μm to ensure the consistency of the vibration effect. The stability of the amplitude is crucial to ensure that impurities such as dust can be effectively shaken off, avoiding fluctuations in the cleaning effect due to unstable amplitude. At the same time, the power consumption is strictly controlled to not exceed 0.5±0.05W±10%. While improving the cleaning efficiency, low power consumption operation is maintained, which not only ensures the efficient operation of the filter, but also does not significantly increase the energy consumption of the vehicle, achieving a good balance between performance and energy consumption.

[0048] This intelligent adaptive adjustment mechanism enables the filter to reasonably adjust its working state according to the actual air quality. It avoids component fatigue and wear caused by excessive vibration when the air quality is good, and can improve the cleaning ability in time when the pollution is serious. By reducing unnecessary high-frequency vibration and maintaining stable working performance, it effectively extends the service life of the piezoelectric ceramic vibrating plate and the entire filter, reducing the user's replacement cost and maintenance frequency.

[0049] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the concept of the present invention is not limited to this invention, and any modification using the concept of the present invention will be included in the scope of protection of this patent right.

Claims

1. An automobile air conditioning filter, comprising an outer frame and a filter element spaced apart in the outer frame, characterized in that: The filter element includes a piezoelectric ceramic vibrating piece, a mounting aluminum plate, a rubber pad, a nylon mesh bracket, and a filter inner core. The filter inner core is installed in the installation cavity of the nylon mesh bracket. The rubber pad is fixed at the bottom of the nylon mesh bracket. The mounting aluminum plate is fixed at the bottom of the rubber pad. The piezoelectric ceramic vibrating piece is fixed at the bottom of the rubber pad.

2. The automotive air conditioning filter according to claim 1, characterized in that: A number of micropores communicating with the installation cavity and notch openings in the shape of equilateral hexagons are evenly distributed on the nylon mesh bracket. The aperture of the micropores is 1-2 mm, and the flow area of the notch openings is 10-20 times that of the micropores.

3. The automotive air conditioning filter according to claim 1, characterized in that: It further includes a pressing frame made of nickel-titanium shape memory alloy. The pressing frame is in a "冂" shape structure. Card slots for the two ends of the filter element to be inserted are provided on both sides of the outer frame body. Connecting grooves are provided on both sides of the card slots. The connecting feet of the pressing frame are in a wavy structure, and the connecting feet are elastically deformed and embedded in the above-mentioned connecting grooves.

4. The automotive air conditioning filter according to claim 3, characterized in that: The wavelength of the connecting feet is 8-12 mm, and the wave height is 2.5-3.5 mm. The nickel-titanium shape memory alloy pressing frame has been pre-deformed. When the temperature is higher than 40 °C, it returns to a flat state, generating a linear pressing force of 2-2.5 N / mm. When the temperature is lower than 45 °C, it presents a wavy shape, and maintains a basic pressing force of 0.5-1 N / mm through the superelastic effect.

5. The automotive air conditioning filter according to claim 3, characterized in that: The interference fit amount of the connecting groove is 0.1-0.3 mm, and the inner wall of the connecting groove is coated with a polytetrafluoroethylene anti-friction layer, and the thickness of the polytetrafluoroethylene anti-friction layer is 40-45 μm.

6. The automotive air conditioning filter according to claim 1, characterized in that: It further includes a DC / DC boost module, whose input end is electrically connected to the vehicle-mounted 12V power supply, and is used to boost the input voltage to 130V ± 5% DC; an H-bridge inverter, whose input end is electrically connected to the output end of the DC / DC boost module, and is used to convert direct current into 200Hz alternating current; a PWM control module, whose signal output end is connected to the drive port of the H-bridge inverter, and is used to generate a 200Hz square wave control signal; an overvoltage protection module, whose voltage sampling end is connected in parallel to the output end of the DC / DC boost module, and cuts off the circuit when it detects that the output voltage exceeds 130V; The output end of the H-bridge inverter is electrically connected to the two electrodes of the piezoelectric ceramic vibrating piece.

7. The automotive air conditioning filter according to claim 6, characterized in that: The piezoelectric ceramic vibrating piece vibrates at a frequency of 200Hz under the drive of the PWM control module. The power consumption of a single vibrating piece is 0.5 ± 0.05W, and the vibration amplitude range is 10-15 μm. The overvoltage protection module is set with a voltage threshold of 130V. When the output voltage of the DC / DC boost module exceeds 130V, the overvoltage protection module cuts off the power supply circuit of the H-bridge inverter.

8. The automotive air conditioner filter according to any one of claims 1-7, characterized in that: The PWM control module of the H-bridge inverter integrates a vibration frequency adaptive algorithm, which dynamically adjusts the output frequency according to the PM2.5 concentration signal (input range 0-500 μg / m³) of the vehicle-mounted air quality sensor: When PM2.5 ≤ 75 μg / m³, maintain the 200Hz reference frequency; When PM2.5 > 75 μg / m³, increase the frequency by 5Hz for every 50 μg / m³ increase, up to 250Hz at most; After the frequency is increased, the amplitude of the piezoelectric ceramic vibration piece is stabilized at 10-15μm through voltage feedback closed-loop control, and the power consumption does not exceed 0.5±0.05W±10%.

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