Negative ion electric hair dryer

Abstract

The utility model provides a negative ion electric hair dryer which comprises a hair dryer body, a hair dryer front cover, a fixing seat, a negative ion generator, a negative ion sensing piece and a system circuit board, an air channel is arranged in the hair dryer body, the hair dryer front cover and the fixing seat are arranged at the outlet end of the air channel, and the negative ion sensing piece is arranged on the fixing seat. The inner side of the hair dryer front cover and the outer side of the fixing base are oppositely arranged, the negative ion generator is arranged on the fixing base, the negative ion sensing piece is arranged on the inner side of the hair dryer front cover, and the system circuit board is arranged in the hair dryer body and electrically connected with the negative ion sensing piece. When the negative ions hit the negative ion sensing piece, current is generated and transmitted to the system circuit board, and the system circuit board outputs the negative ion concentration according to a received current signal. The anion electric hair dryer can solve the problem that the concentration of anions in air is difficult to detect when an existing anion electric hair dryer is used.

Description

Technical Field

[0001] The utility model relates to the technical field of hair dryer devices, in particular to a negative ion hair dryer. Background Art

[0002] A hair dryer is a kind of electrical appliance mainly used for drying and styling hair. Many high-speed silent hair dryers are equipped with a negative ion generator to solve the problem that hair is attracted to each other due to static electricity caused by hair dryness, and negative ions are also beneficial to physical health. Most hair dryers with negative ions only mention their ability to generate negative ions. However, currently, hair dryers with negative ions in the industry do not detect the negative ion concentration. It can only rely on the user's intuitive feeling to judge whether there are negative ions, or the negative ion concentration is too low. This non-digital physical feeling method often causes trouble to users.

[0003] In a simple metal sheet negative ion sensing structure, due to the installation position and shape differences (such as the degree of bending, the shape of the tip) of the brush or metal tip of the negative ion generator, the change in the generated negative ion concentration is very large. Coupled with the changes in wind speed, negative high voltage, humidity, temperature, etc., the change in negative ion concentration is sometimes a difference of hundreds to thousands of times. Currently, there is a problem that it is difficult to detect the negative ion concentration in the air during the use of existing negative ion hair dryers. Summary of the Utility Model

[0004] The utility model provides a negative ion hair dryer, specifically a negative ion hair dryer for sensing the negative ion concentration.

[0005] In a first aspect, the utility model provides a negative ion hair dryer, which includes: a hair dryer body, a hair dryer front cover, a fixing seat, a negative ion generator, a negative ion sensing sheet, and a system circuit board. An air passage is provided in the hair dryer body. The hair dryer front cover and the fixing seat are arranged at the outlet end of the air passage. The inner side of the hair dryer front cover is oppositely arranged to the outer side of the fixing seat. The negative ion generator is arranged on the fixing seat. The negative ion sensing sheet is arranged on the inner side of the hair dryer front cover. The system circuit board is arranged in the hair dryer body and is electrically connected to the negative ion sensing sheet. When negative ions hit the negative ion sensing sheet, a current is generated and transmitted to the system circuit board.

[0006] Optionally, the system circuit board includes a current-to-voltage conversion resistor, an analog-to-digital converter, and an MCU. Both the negative ion sensing sheet and the current-to-voltage conversion resistor are electrically connected to the input end of the analog-to-digital converter. The output end of the analog-to-digital converter is electrically connected to the MCU.

[0007] Optionally, the system circuit board further includes a high-input impedance amplifier. The input end of the analog-to-digital converter is electrically connected to the output end of the high-input impedance amplifier, and the input end of the high-input impedance amplifier is electrically connected to the negative ion sensing sheet and the current-to-voltage conversion resistor.

[0008] Optionally, the fixing base includes a peripheral structure, a spoke structure, and a central structure; the peripheral structure is disposed on the inner side of the hair dryer housing, the central structure is disposed at the center of the fixing base, the peripheral structure and the central structure are connected by the spoke structure, and a plurality of air channels are included between the spoke structures.

[0009] Optionally, it further includes a heating wire and a temperature sensor. The heating wire is installed on the spoke structure around the central structure, the negative ion generator is installed on the central structure, the tip of the negative ion generator is installed on the central structure, and the temperature sensor is installed on the spoke structure.

[0010] Optionally, the hair dryer front cover includes a shielding structure, a front cover outer frame, an inclined surface, and an air channel. The shielding structure is provided with a columnar structure, a male connector terminal is provided at one end of the columnar structure away from the shielding, a concave structure is provided on the central structure, a female connector terminal is provided on the concave structure, and the male connector terminal is inserted and connected to the female connector terminal.

[0011] In a second aspect, the present invention further provides a negative ion sensing method, which is applied to the negative ion hair dryer as described in any one of the present invention. The method includes:

[0012] When the negative ion hair dryer works, the negative ion generator generates negative ions, and the negative ion sensing sheet receives negative ions in the air;

[0013] When the negative ions hit the negative ion sensing sheet, a current is generated and transmitted to the system circuit board;

[0014] The system circuit board outputs the negative ion concentration based on the received current information.

[0015] Optionally, the method further includes:

[0016] Before leaving the factory, the negative ion hair dryer obtains the average value of the negative ion concentration in each gear combination during factory mass production and an absolute minimum negative ion concentration threshold, and the absolute minimum negative ion concentration threshold is used as an absolute defective product judgment criterion;

[0017] According to the average value of the negative ion concentration in each gear combination during factory mass production, determine the minimum negative ion concentration threshold in different wind speeds and different gear combinations.

[0018] Optionally, the method further includes:

[0019] When the number of uses of the negative ion hair dryer is within the preset initial learning number of times, determine whether the negative ion concentration value of the current time is higher than the absolute negative ion concentration minimum threshold in each gear combination during mass production in the factory;

[0020] If the negative ion concentration value of the current time is higher than the absolute negative ion concentration minimum threshold in each gear combination during mass production in the factory, determine that the negative ion concentration is normal, otherwise it is abnormal;

[0021] If the negative ion concentration value of the current time is higher than the absolute negative ion concentration minimum threshold in each gear combination during mass production in the factory, then linearly correct the minimum negative ion concentration threshold of each gear combination with the difference between the average value of the cumulative negative ion concentration of the current time and the average value of the negative ion concentration in each gear combination during mass production in the factory;

[0022] Among them, the formula for the minimum negative ion concentration threshold of the negative ion hair dryer is

[0023] Average value of cumulative negative ion concentration of the current time = (negative ion concentration of the current time + average value of cumulative * number of previous uses) / total number of uses;

[0024] Correction percentage = (average value of cumulative negative ion concentration of the current time - average value of negative ion concentration during mass production in the factory) / average value of negative ion concentration during mass production in the factory;

[0025] New minimum negative ion concentration threshold = minimum negative ion concentration threshold preset by the factory * (1 + correction percentage).

[0026] Optionally, the method further includes:

[0027] After the number of uses of the negative ion hair dryer exceeds the preset initial learning number of times, retain the calibration result at the initial learning number of times;

[0028] Based on the calibration result, determine whether the negative ion concentration is lower than the minimum negative ion concentration threshold in different wind speeds and different gear combinations;

[0029] If the negative ion concentration is lower than the minimum negative ion concentration threshold in different wind speeds and different gear combinations, enter the preset abnormal prompt mode.

[0030] In the present utility model, the negative ion hair dryer includes: a hair dryer body, a hair dryer front cover, a fixing base, a negative ion generator, a negative ion sensing sheet, and a system circuit board. An air passage is provided in the hair dryer body. The hair dryer front cover and the fixing base are arranged at the outlet end of the air passage. The inner side of the hair dryer front cover is oppositely arranged with the outer side of the fixing base. The negative ion generator is arranged on the fixing base. The negative ion sensing sheet is arranged on the inner side of the hair dryer front cover. The system circuit board is arranged in the hair dryer body and is electrically connected to the negative ion sensing sheet. When negative ions strike the negative ion sensing sheet, a current is generated and transmitted to the system circuit board, and the system circuit board outputs the negative ion concentration, which can solve the problem that it is difficult to detect the negative ion concentration in the air during the use of the existing negative ion hair dryer. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0032] Figure 1 is a schematic structural diagram of a negative ion hair dryer provided by the present utility model;

[0033] Figure 2 is a schematic connection diagram of a negative ion sensing sheet and a high-input impedance amplifier provided by the present utility model;

[0034] Figure 3 is another schematic connection diagram of a negative ion sensing sheet and a high-input impedance amplifier provided by the present utility model;

[0035] Figure 4 is another schematic connection diagram of a negative ion sensing sheet and a high-input impedance amplifier provided by the present utility model;

[0036] Figure 5 is a schematic structural diagram of the fixing base provided by the present utility model;

[0037] Figure 6 is a schematic diagram of the installation positions of the heating wire and the temperature sensor provided by the present utility model;

[0038] Figure 7 is a schematic structural diagram of the hair dryer front cover provided by the present utility model;

[0039] Figure 8 is a diagram of the installation position of the negative ion sensing sheet provided by the present utility model;

[0040] Figure 9It is a schematic diagram of the front cover of the hair dryer and the fixing base provided by the present utility model;

[0041] Figure 10 It is a schematic flow chart of a negative ion sensing method provided by the present utility model.

[0042] Among them, 10 is the front cover of the hair dryer; 110 is the shielding structure; 120 is the outer frame of the front cover; 130 is the inclined surface; 140 is the columnar structure; 150 is the male connector terminal; 20 is the fixing base; 210 is the peripheral structure; 220 is the spoke structure; 230 is the central structure; 240 is the concave structure; 250 is the female connector terminal; 30 is the negative ion generator; 310 is the tip; 40 is the negative ion sensing sheet; 50 is the air passage; 60 is the heating wire; 70 is the temperature sensor. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0044] As Figure 1 shown, Figure 1 It is a negative ion hair dryer provided by the present utility model. The negative ion hair dryer includes: a hair dryer body, a front cover 10 of the hair dryer, a fixing base 20, a negative ion generator 30, a negative ion sensing sheet 40, and a system circuit board. An air passage 50 is provided in the hair dryer body. The front cover 10 of the hair dryer and the fixing base 20 are arranged at the outlet end of the air passage 50. The inner side of the front cover 10 of the hair dryer is oppositely arranged with the outer side of the fixing base 20. The negative ion generator 30 is arranged on the fixing base 20. The negative ion sensing sheet 40 is arranged on the inner side of the front cover 10 of the hair dryer. The system circuit board is arranged in the hair dryer body and is electrically connected to the negative ion sensing sheet 40; among them, when negative ions hit the negative ion sensing sheet 40, a current is generated and transmitted to the system circuit board.

[0045] In the present utility model, during the operation of the above-mentioned negative ion hair dryer, the negative ion generator 30 generates negative ions. When the negative ions hit the negative ion sensing sheet 40, a current is generated and transmitted to the system circuit board, and the system circuit board outputs the negative ion concentration.

[0046] The above-mentioned front cover 10 of the hair dryer can visually cover the internal components of the hair dryer and can also prevent foreign objects such as hair from entering the hair dryer.

[0047] The above-mentioned negative ion generator 30 can generate a large number of negative ions during operation. The emission end of the negative ion generator 30 can be a metal spike or a carbon fiber brush. During the operation of the negative ion generator 30, negative ions are released from the tip and begin to diffuse into the air.

[0048] The above-mentioned negative ion sensing sheet 40 is used to sense negative ions in the air. The negative ion sensing sheet 40 can be a metal sensing sheet or a negative ion sensing sheet 40 made of a conductive material, such as materials like graphite sheets, carbon powder coatings, silver glue, etc. The area of the negative ion sensing sheet 40 in contact with the air is proportional to the number of negative ions received.

[0049] It should be noted that the closer the negative ion sensing sheet 40 is to the negative ion generator 30, the highest concentration of negative ions is when they have not diffused over a large area. However, it cannot be too close to avoid all of them being absorbed by the negative ion sensing sheet 40 and returning to the system circuit board. The negative ion sensing sheet 40 and the negative ion generator 30 must maintain an appropriate distance. Because the high-speed airflow generated by the hair dryer passes through the negative ion generator 30, the negative ions diffuse very quickly. A setting distance of more than 1 centimeter between the negative ion sensing sheet 40 and the negative ion generator 30 should have little impact.

[0050] The above-mentioned system circuit board is used to receive the current signal generated by the negative ion sensing sheet 40 and output the negative ion concentration.

[0051] The negative ion sensing sheet 40 is arranged on the inner side of the hair dryer front cover 10, has a large enough area, preferably a diameter of 1 centimeter, and is at a position where the negative ions just leave the negative ion generator 30 and have not yet diffused. And the airflow directly impacts the front cover from the air passage 50, and a large number of negative ions impact the negative ion sensing sheet 40, generating a current and entering the system circuit board.

[0052] In the present utility model, by integrating the hair dryer body, the hair dryer front cover 10, the fixing seat 20, the negative ion generator 30, the negative ion sensing sheet 40, and the system circuit board, an air passage 50 is provided in the hair dryer body. The hair dryer front cover 10 and the fixing seat 20 are arranged at the outlet end of the air passage 50. The inner side of the hair dryer front cover 10 is arranged opposite to the outer side of the fixing seat 20. The negative ion generator 30 is arranged on the fixing seat 20. The negative ion sensing sheet 40 is arranged on the inner side of the hair dryer front cover 10. The system circuit board is arranged in the hair dryer body and is electrically connected to the negative ion sensing sheet 40. When negative ions strike the negative ion sensing sheet 40, a current is generated and transmitted to the system circuit board. The system circuit board outputs the negative ion concentration according to the received current signal. The present utility model can solve the problem of difficult detection of the negative ion concentration in the air during the use of existing negative ion hair dryers.

[0053] Optionally, the system circuit board includes a current-to-voltage conversion resistor, an analog-to-digital converter, an MCU, a negative ion sensing sheet 40, and the current-to-voltage conversion resistor and the negative ion sensing sheet 40 are both electrically connected to the input end of the analog-to-digital converter, and the output end of the analog-to-digital converter is electrically connected to the MCU.

[0054] In the present utility model, the above-mentioned current-to-voltage conversion resistor can be understood as a resistor that rationally utilizes the relationship between current and voltage to achieve more stable and efficient circuit operation. The negative ion sensing sheet 40 receives negative ions in the air and generates a current that is connected to the input end of the analog-to-digital converter. After the current is converted into a voltage, it should be within the input voltage range of the analog-to-digital converter, and the voltage range should be between the power supply and ground voltage of the analog-to-digital converter.

[0055] The above-mentioned analog-to-digital converter is an electronic device that converts digital signals into analog signals or analog signals into digital signals. Specifically, it is an electronic device that can convert a negative ion current signal into a negative ion concentration. The larger the negative ion current signal, the higher the negative ion concentration, and the smaller the negative ion current signal, the lower the negative ion concentration.

[0056] The above-mentioned MCU is a microcontroller, specifically a single-chip microcomputer, which is used to receive analog signal data, specifically the signal data of the negative ion concentration.

[0057] It should be noted that the negative ion sensing sheet 40 is connected to the circuit board through a wire structure. The connection point between the wire structure and the circuit board is then connected to the analog power supply of the analog-to-digital converter through a current-to-voltage conversion resistor. If the analog-to-digital converter is integrated within the microcontroller, it is connected to the power supply of the microcontroller, preferably to the analog power supply of the microcontroller. If the microcontroller does not have an analog power supply, it is connected to the digital power supply V+ of the microcontroller. Assuming the analog power supply is Va (V analog) and the negative ion current signal is I_neg (negative ion current) and the current-to-voltage conversion resistor is R, since the current signal generated by the negative ion sensing sheet is negative, the voltage converted by the current-to-voltage conversion resistor = Va - (I_neg * R), which will fall in the middle of Va and the power supply ground, that is, within the input voltage range of the analog-to-digital converter. The induced negative ion current signal I_neg is very weak, so the above-mentioned current-to-voltage conversion resistor R must be large enough to allow the weak current generated by the trace negative ions received by the negative ion sensing sheet 40 to generate a large enough voltage change. The input impedance of the analog-to-digital converter must be large enough to prevent the weak current generated by the induced negative ions from being shunted at the input impedance of the analog-to-digital converter. If the input resistance of the analog-to-digital converter is not large enough, or the voltage change generated by the weak current at the current-to-voltage conversion resistor connected to the power supply is not high enough, then a high input impedance amplifier circuit is added to amplify the voltage change. This amplifier is connected to the analog power supply, not to the power supply of the power device, because the noise current of the power device power supply is large, and the current noise of the general power supply is greater than the induced negative ion current, and a high noise voltage will be induced on the large resistor.

[0058] Optionally, the system circuit board further includes a high input impedance amplifier. The input end of the analog-to-digital converter is electrically connected to the output end of the high input impedance amplifier, and the input end of the high input impedance amplifier is electrically connected to the negative ion sensing sheet 40 and the current-to-voltage conversion resistor.

[0059] In the present utility model, the above-mentioned high-input impedance amplifier is an electronic device or circuit with a relatively high input impedance, which can effectively amplify voltage or current in a circuit while maintaining a relatively low output impedance to optimize the performance of the electronic device. For voltage-driven and current-driven circuits, increasing the input impedance can reduce the load on the voltage or current source, making the device easier to drive and thus improving the performance of the circuit. The output impedance of the high-input amplifier is very low, which can drive a secondary load with a low input impedance. The input impedance of the high-input impedance amplifier is independent of the secondary. Whether the secondary input impedance is large or small, the input impedance of the high-input impedance amplifier remains unchanged. The above-mentioned high-input impedance amplifier can be LF351, TL081, or TL084. There are 4 TL081s in TL084, and a cheap instrumentation amplifier can be assembled with 3 TL081s. It not only has a high input impedance but also a magnification factor that can be as high as a thousand times.

[0060] Figure 2 It is a schematic diagram showing the connection between a negative ion sensing sheet and a high-input impedance amplifier provided by the present utility model. Specifically, the negative ion sensing sheet is connected to V+ through a large resistor 1, and the connection point is then connected to the input terminal of the high-input impedance amplifier. The connection point is also connected to 0.5V+ through a series of a diode and a large resistor 2. The order of the diode and the large resistor 2 can be reversed. The P pole of the diode is connected to 0.5V+, and the N pole of the diode is connected to the connection point of the negative ion sensing sheet. When the current generated by the negative ion sensing sheet causes the voltage at the connection point to be lower than 0.5V+, the diode conducts. Before the diode conducts, the input change caused by the induced current is the induced current I_neg multiplied by the large resistor 1. After the diode conducts, the input change caused by the induced current is the induced current I_neg multiplied by the parallel resistance of the large resistor 1 and the large resistor 2. In this way, the negative ion concentration sensing can become a non-linear two-stage magnification. The function of the non-linear impedance structure is that when the induced voltage change is small, the voltage-dividing resistor is large, and when the voltage change amount is greater than a certain preset change amount, the equivalent resistance of the voltage division becomes smaller.

[0061] In the present utility model, the circuit where the negative ion sensing sheet is connected to the positive power supply V+ can adopt a non-linear impedance structure. The impedance between the contact point of the large resistor connected to the positive power supply and the negative ion sensing sheet is very large when the voltage is between the positive power supply voltage and about half of the positive power supply voltage, so as to improve the sensitivity. However, when the voltage is lower than half of the positive power supply voltage, the impedance becomes lower to sense a larger range of negative ion concentrations. Preferably, this smaller resistor is one-fifth of the original resistor value. Negative ions in the air are on the negative ion sensing sheet. Because a large resistor is also connected to the positive power supply at the input connection point, the equivalent impedance is a capacitor in parallel with a large resistor. The induced negative ions will charge the capacitance value of the negative ion sensing sheet at the same time. The weak current generated by the induced negative ions will also discharge to the positive power supply through the large resistor at the same time. The voltage change in this time domain is a curve of a certain voltage discharging a capacitor through a resistor, which is an exponential discharge curve. When the induced weak negative ion current is equal to the current generated by the voltage difference of the capacitance voltage of the negative ion sensing sheet on the large resistor, the voltage balance is achieved. Therefore, the system software should have a peak detection algorithm to truly reflect the negative ion concentration.

[0062] Figure 3 It is a schematic diagram of the connection between another negative ion sensing sheet provided by the present utility model and a high-input impedance amplifier. Specifically, the high-input impedance amplifier can be LF351, TL081, or TL084. Inside the dashed box is the high-input impedance amplifier. The input end of the high-input impedance amplifier is connected to two 10 MΩ resistors, and the two 10 MΩ resistors are used for voltage division. Therefore, the output DC voltage is 0.5V+. In the equivalent circuit, the negative ion sensing sheet is connected to 0.5V+ through a 5 MΩ resistor. In this circuit, the voltage amplification factor of the amplifier is 1 times. When the negative ion current I_neg changes, it will cause a voltage change of ΔV = I_neg * 5 MΩ.

[0063] Figure 4This is another schematic diagram showing the connection between the negative ion sensing sheet and the high input impedance amplifier provided by the present utility model. Specifically, the high input impedance amplifier with a voltage amplification factor of 6 can be LF351, TL081, or TL084. Inside the dashed box is the high input impedance amplifier that amplifies the voltage by 6 times. The input terminals of the high input impedance amplifier are respectively connected to a 9MΩ resistor and a 1MΩ resistor for voltage division. The DC voltage at the positive input terminal of the negative ion sensing sheet and the high input impedance amplifier with a voltage amplification factor of 6 is 0.1V+, so the output DC voltage is 0.6V+. In the equivalent circuit, the negative ion sensing sheet is connected to 0.1V+ through a 0.9MΩ resistor, and the voltage amplification factor of the amplifier is 6 times. The voltage change ΔV caused by the negative ion current I_neg is ΔV = I_neg * 0.9MΩ * 6 = I_neg * 5.4MΩ. If the bias resistor grounded at the front stage is increased to increase the voltage change caused by I_neg, the DC voltage will increase, and a resistor needs to be connected from the negative input terminal to V+ to pull down the output DC voltage. By adjusting the bias resistor, the DC voltage on the negative ion sensing sheet can be corrected.

[0064] It should be noted that the DC voltage on the negative ion sensing sheet can also be corrected by the single-chip microcomputer. When the power is turned on for 10 seconds, the negative ion output is cut off for 2 seconds. At this time, the output of the high input impedance amplifier is the DC bias voltage output when there is no negative ion input to the amplifier. The single-chip microcomputer uses this value as the zero output reference voltage for negative ions. After the negative ions are restarted, the voltage change ΔV generated from this zero output reference voltage for negative ions is the voltage change caused by the negative ion induction current on the equivalent input impedance at the front stage.

[0065] Optionally, the fixing base 20 includes a peripheral structure 210, a spoke structure 220, and a central structure 230; the peripheral structure 210 is arranged on the inner side of the hair dryer housing, the central structure 230 is arranged at the center position of the fixing base 20, and the peripheral structure 210 and the central structure 230 are connected by the spoke structure 220, and the spoke structure 220 includes a plurality of air channels 50.

[0066] In the present utility model, the above-mentioned peripheral structure 210 and the central structure 230 are connected by the spoke structure 220 to form a structure similar to a wheel.

[0067] Figure 5 This is a schematic diagram of the structure of the fixing base provided by the present utility model. Specifically, the fixing base 20 includes a peripheral structure 210, a spoke structure 220, and a central structure 230. The peripheral structure 210 is arranged on the inner side of the hair dryer housing, the central structure 230 is arranged at the center position of the fixing base 20, and the peripheral structure 210 and the central structure 230 are connected by the spoke structure 220 to form a structure similar to a wheel, and the spoke structure 220 includes a plurality of air channels 50.

[0068] Optionally, it further includes a heating wire 60 and a temperature sensor 70. The heating wire 60 is installed on the spoke structure 220 around the central structure 230. The negative ion generator 30 is installed on the central structure 230, and the tip 310 of the negative ion generator 30 is installed on the central structure 230. The temperature sensor 70 is installed on the spoke structure 220.

[0069] In the present utility model, the above-mentioned heating wire 60 is used to provide a heat source. By being installed on the spoke structure 220 around the central structure 230, at the air outlet of the hair dryer, the air flow must pass through the heating wire 60 to carry out the heat and blow it to the place where the user needs it.

[0070] The tip 310 of the negative ion generator 30 is installed on the central structure 230 to release negative ions into the air passage 50.

[0071] The above-mentioned temperature sensor 70 can be an NTC negative temperature coefficient resistor for temperature sensing. By using the NTC negative temperature coefficient resistor, it can avoid the air temperature being too high to damage the user's hair quality, and can also be used as over-temperature protection for the heating wire 60. When the temperature exceeds the predetermined temperature threshold, the temperature sensor 70 will cut off the heating wire circuit through the system circuit board to play a protective role and prevent the heating wire 60 from being damaged due to overheating.

[0072] The temperature sensor 70 is installed on the spoke structure 220. There is a certain distance between the installation position of the temperature sensor 70 and the heating wire 60 to allow the air flow to pass through, but it cannot be too far, so as to simultaneously reflect the temperatures of both the air flow and the heating wire 60.

[0073] It should be noted that the heating wire 60, the tip 310 of the negative ion generator 30, and the temperature sensor 70 share the fixing seat 20, but the heating wire 60, the tip 310 of the negative ion generator 30, and the temperature sensor 70 must all be in the open air passage 50, so that the functions of the heating wire 60, the tip of the negative ion generator 30, and the temperature sensor 70 can take effect.

[0074] Figure 6 It is a schematic diagram of the installation positions of the heating wire and the temperature sensor provided by the present utility model. Specifically, the heating wire 60 is installed around the spoke structure 220 between the central structure 230 and the outer structure 210 for heat exchange with the air. The temperature sensor 70 is installed on the spoke structure 220 to simultaneously sense the temperatures of the air flow and the heating wire 60.

[0075] Optionally, the front cover 10 of the hair dryer includes a shielding structure 110, a front cover outer frame 120, an inclined surface 130, and an air channel 50. The shielding structure 110 is provided with a columnar structure 140. A male connector terminal 150 is provided at one end of the columnar structure 140 away from the shielding. A concave structure 240 is provided in the central structure 230 of the fixing base 20. A female connector terminal 250 is provided on the concave structure 240. The male connector terminal 150 on the front cover 10 is connected to the female connector terminal 250 on the fixing base 20 in a plug-in manner.

[0076] In the present utility model, the above-mentioned shielding structure 110 can block the user's line of sight and also block the central part of the air channel 50, making it difficult for the user to see the heating wire on the fixing base 20, the tip of the negative ion generator 30, and the temperature sensor 70 through the front cover opening.

[0077] In the present utility model, the negative ion sensing sheet 40 is installed on the shielding structure 110 of the front cover, has a sufficiently large area, preferably with a diameter of 1 cm, and is at a position where the negative ions just leave the negative ion tip and have not yet diffused. And the air flow directly impacts the central shielding structure 110 of the front cover from the air channel 50, and a large amount of negative ions impact the negative ion sensing sheet 40, generating a current and transmitting it to the system circuit board.

[0078] The above-mentioned inclined surface 130 can reduce the instantaneous change in air pressure and flow rate generated when the air channel 50 with a relatively large cross-sectional area suddenly decreases to an air channel 50 with a very small cross-sectional area, and remove the spatial acute angles that will generate noise for the air flow.

[0079] The plug-in connection between the above-mentioned male connector terminal 150 and female connector terminal 250 can adopt a pluggable cold-pressed quick-insert bullet connector, or a plug spring and blade, or a pin-type male and female terminal, or a spring pin pogopin of a Bluetooth headset.

[0080] Figure 7 It is a schematic diagram of the front cover structure of the hair dryer provided by the present utility model. Specifically, the front cover 10 of the hair dryer includes a shielding structure 110, a front cover outer frame 120, an inclined surface 130, and an air channel 50; the shielding structure 110 can block the user's line of sight and also block the central part of the air channel 50; the inclined surface 130 can reduce the instantaneous change in air pressure and flow rate generated when the air flow channel with a relatively large cross-sectional area suddenly decreases to an air flow channel with a very small cross-sectional area, and remove the spatial acute angles that will generate noise for the air flow.

[0081] Figure 8It is a diagram showing the installation position of the negative ion sensing sheet 40 provided by the present utility model. Specifically, the negative ion sensing sheet 40 is installed inside the shielding structure 110 of the front cover 10 of the hair dryer. The negative ion sensing sheet 40 is used to receive negative ions in the air. When negative ions strike the negative ion sensing sheet 40, an electric current is generated and transmitted to the system circuit board.

[0082] Figure 9 It is a schematic diagram showing the connection between the front cover of the hair dryer and the fixing base provided by the present utility model. Specifically, the negative ion sensing sheet 40 is installed in the shielding structure 110 part of the front cover; the shielding structure 110 is provided with a columnar structure 140, and a male connector terminal 150 is provided at one end of the columnar structure 140 away from the shielding; the heating wire, the tip 310 of the negative ion generator and the temperature sensor 70 are installed on the fixing base 20; a concave structure 240 is provided in the central structure 230 of the fixing base 20, and a female connector terminal 250 is provided on the concave structure 240. The male connector terminal 150 is inserted and connected with the female connector terminal 250. The negative ion sensing sheet 40 is connected to the male end 150 of the plug through the columnar structure 140 inside the shielding structure 110 of the front cover by a wire. During production, when installing the front cover, the columnar structure 140 is directly inserted into the concave structure 240 of the fixing base 20, and the male connector terminal 150 of the connector slides into the female connector terminal 250 of the connector. This insertion action can break the oxide layer on the contact surface of the male and female ends of the plug to produce a good electrical connection.

[0083] As Figure 10 shown, Figure 10 It is a schematic flowchart of a negative ion sensing method provided by the present utility model. The negative ion sensing method is applied to the negative ion hair dryer as described in any one of the present utility model. The negative ion sensing method includes the following steps:

[0084] 1001. When the negative ion hair dryer is working, the negative ion generator generates negative ions, and the negative ion sensing sheet receives negative ions in the air.

[0085] 1002. When negative ions strike the negative ion sensing sheet, an electric current is generated and transmitted to the system circuit board.

[0086] 1003. The system circuit board outputs the obtained negative ion concentration according to the received current signal.

[0087] In the embodiment of the present utility model, the system circuit board includes an analog-to-digital converter and an MCU. The analog-to-digital converter is an electronic device that can convert the received current signal into a negative ion concentration; the MCU is used to receive the signal data of the negative ion concentration.

[0088] In an embodiment of the present utility model, when negative ions strike the negative ion sensing sheet, a current is generated, and this current is transmitted to the system circuit board. The analog-to-digital converter on the system circuit board converts the current signal into a signal of negative ion concentration according to the received current signal. The larger the negative ion current signal, the higher the negative ion concentration; the smaller the negative ion current signal, the lower the negative ion concentration.

[0089] Optionally, the method further includes: before leaving the factory, the negative ion hair dryer obtains the average value of the negative ion concentration in each gear combination during factory mass production and an absolute minimum negative ion concentration threshold; according to the average value of the negative ion concentration in each gear combination during factory mass production, determine the minimum negative ion concentration threshold in different wind speeds and different gear combinations.

[0090] In an embodiment of the present utility model, the above absolute minimum negative ion concentration threshold is used as an absolute non-conforming product judgment benchmark.

[0091] When producing a negative ion hair dryer, there are tolerances in electronic components, and there are also tolerances in the structural shape, the air flow rate and wind speed driven by the motor, etc. Since the installation position and shape of the tip of the negative ion generator (such as the degree of bending, the shape of the tip) have a great influence on the change of the generated negative ion concentration, plus the changes in wind speed, negative high voltage, humidity, temperature, etc., the change in negative ion concentration is sometimes a difference of hundreds to thousands of times. Although the difference is so large, they all belong to good products. Since the negative ion concentration difference is large, when calculating the negative ion concentration, the minimum concentration threshold in different wind speeds and heating wire gear combinations in a large number of good hair dryers in the factory, and the statistical average value of the negative ion concentration in each gear combination during mass production can be used to evaluate the negative ion concentration value of the hair dryer in use.

[0092] Taking a group of factory mass-produced hair dryers as an example, the hair dryer includes a first-level wind speed, a second-level wind speed, a third-level wind speed, a first gear temperature, a second gear temperature, and a third gear temperature. First, obtain the negative ion concentration values in the first-level wind speed and first gear temperature, the negative ion concentration values in the first-level wind speed and second gear temperature, the negative ion concentration values in the first-level wind speed and third gear temperature, the negative ion concentration values in the second-level wind speed and first gear temperature, the negative ion concentration values in the second-level wind speed and second gear temperature, the negative ion concentration values in the second-level wind speed and third gear temperature, the negative ion concentration values in the third-level wind speed and first gear temperature, the negative ion concentration values in the third-level wind speed and second gear temperature, and the negative ion concentration values in the third-level wind speed and third gear temperature of each hair dryer, and calculate the average value of the negative ion concentration in each gear combination, and determine the minimum negative ion concentration in different wind speeds and different gear combinations. An absolute minimum negative ion concentration threshold is formulated based on the minimum negative ion concentration statistically obtained from this big data. As long as the negative ion concentration is lower than this absolute minimum negative ion concentration threshold, it is judged as non-conforming.

[0093] When the voltage value of the negative ion sensing sheet read is lower than the absolute lowest negative ion concentration threshold in the corresponding wind speed and corresponding gear combination, an abnormal prompt mode will be issued. The abnormal prompt mode can be understood as when the negative ion concentration is insufficient, using an LED light, a numerical value, or other means to display or give an audible prompt to the user.

[0094] It should be noted that if the hair dryer has a numerical display, a reference to the negative ion concentration can be added to the numerical display. For example, a numerical value, or a high, medium, or low gear display. It is also possible to increase the negative voltage of the negative ion generator according to the negative ion concentration to increase the negative ion concentration.

[0095] Since the negative ion concentrations generated by each hair dryer vary greatly, it is difficult to use a fixed lowest negative ion concentration threshold as the basis for judging the negative ion concentration range of different hair dryers. Instead, a mathematical formula is used to let each hair dryer learn its own lowest negative ion concentration threshold.

[0096] In the production in the factory, the mathematical formula in the hair dryer is also used for judgment. Therefore, before learning, it is necessary to first judge with the absolute lowest negative ion concentration threshold. This absolute lowest negative ion concentration threshold is a negative ion concentration threshold that, regardless of how much the hair dryer monomer differs, is judged as a defective product as long as it is lower than this absolute lowest negative ion threshold.

[0097] When the detected negative ion concentration is higher than the absolute lowest negative ion concentration threshold, the learning process begins. And although the negative ion concentrations of the hair dryer monomers vary greatly, the threshold obtained from the average negative ion concentration of each temperature and wind speed gear obtained from big data is still used as the factory preset value of the lowest negative ion concentration threshold for each temperature and wind speed gear combination when a hair dryer leaves the factory.

[0098] Optionally, it further includes: a step of learning and correcting the negative ion concentration threshold, a preset initial learning number of times. When the number of uses of the negative ion hair dryer is within the preset initial learning number of times, the lowest negative ion concentration threshold for each gear combination is corrected by linear programming with the difference between the average negative ion concentration of the current accumulation and the average negative ion concentration of each gear combination in the factory batch production.

[0099] In the embodiment of the present invention, because the negative ion concentration will decrease with the number of uses during use, an initial learning number of times is preset. Within this initial learning number of times, the negative ion concentration of the hair dryer in each temperature and wind speed gear combination is continuously learned. In the embodiment of the present invention, the above-mentioned preset initial learning number of times is the number of uses preset by the single-chip microcomputer in the hair dryer, which can specifically be 100 times.

[0100] Whenever the detected negative ion concentration is lower than the absolute minimum threshold of negative ion concentration, a preset abnormal prompt signal must be emitted. This situation mostly occurs during abnormal production of goods and during the QC tests in the factory. Therefore, the negative ion concentration of the goods after leaving the factory should be normal. However, during subsequent learning or during long-term use after learning, as long as the negative ion concentration is lower than the absolute minimum threshold of negative ion concentration, a preset abnormal prompt signal should be emitted.

[0101] Within the preset initial learning times, first judge whether the cumulative average negative ion concentration of the current time is higher than the absolute minimum threshold of negative ion concentration. After determining that the negative ion concentration is normal, start learning. The minimum negative ion concentration threshold for each level combination is linearly planned and corrected by the difference between the cumulative negative ion concentration of the current time and the average negative ion concentration in the combination of each temperature and wind speed level during large-scale production in the factory. For example, if the cumulative negative ion concentration of a certain level combination is 10% higher than the average negative ion concentration in the large-scale statistics, then the minimum negative ion concentration threshold for all level combinations is corrected upward by 10% to correct the tolerance deviation caused by various materials, shapes, and manufacturing processes.

[0102] The formula for the minimum negative ion concentration threshold of the negative ion hair dryer is:

[0103] The cumulative average negative ion concentration of the current time = (the negative ion concentration of the current time + the cumulative average value * the number of previous uses) / the total number of uses;

[0104] The correction percentage = (the cumulative average negative ion concentration of the current time - the average negative ion concentration in large-scale production in the factory) / the average negative ion concentration in large-scale production in the factory;

[0105] The new minimum negative ion concentration threshold = the minimum negative ion concentration threshold preset by the factory * (1 + the correction percentage).

[0106] Optionally, the method further includes: after the number of uses of the negative ion hair dryer exceeds the preset initial learning times, retain the correction result when the preset initial learning times are reached; based on the correction result, determine whether the negative ion concentration is lower than the minimum negative ion concentration threshold in different wind speeds and different level combinations; if the negative ion concentration is lower than the minimum negative ion concentration threshold in different wind speeds and different level combinations, enter the preset abnormal prompt mode.

[0107] In the embodiment of the present utility model, after the 100th use, the adaptive minimum negative ion concentration threshold correction is no longer performed, and the correction result of the 100th use should be retained. In the later use, according to the correction result of the 100th use, it is determined whether the negative ion concentration is lower than the minimum negative ion concentration threshold in different combinations of wind speeds and gears. If it is lower than the minimum negative ion concentration threshold in different combinations of wind speeds and gears, the negative ion concentration is too low, and the preset abnormal prompt mode is entered.

[0108] The above preset abnormal prompt mode can be understood as when the negative ion concentration is insufficient, an LED light, a numerical value, or other means are used to display or give an audible prompt to the user.

[0109] It should be noted that in the initial learning times, each time it is first determined that the negative ion concentration in each gear combination is higher than the absolute minimum negative ion concentration threshold before starting the current learning. Therefore, during the learning process, the negative ion concentration always exceeds the absolute minimum negative ion concentration threshold. Therefore, the minimum negative ion concentration threshold obtained after this learning will be higher than the above-mentioned absolute minimum negative ion concentration threshold, and it is the exclusive minimum negative ion concentration threshold of this hair dryer obtained through adaptive learning. Therefore, when the negative ion reading is lower than the preset minimum negative ion concentration threshold after the number of uses exceeds the initial learning times, it is really due to aging or other abnormal factors that cause the abnormal situation of too low negative ion concentration during long-term use. Although it still exceeds the above-mentioned absolute minimum negative ion concentration threshold at that time, for this hair dryer, it still belongs to an abnormal situation.

[0110] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present utility model and are not restrictive. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. An anion hair dryer, characterized in that, The negative ion hair dryer includes: a hair dryer body, a hair dryer front cover (10), a fixing seat (20), a negative ion generator (30), a negative ion sensing sheet (40), and a system circuit board. An air passage (50) is provided in the hair dryer body. The hair dryer front cover (10) and the fixing seat (20) are arranged at the outlet end of the air passage (50). The inner side of the hair dryer front cover (10) is arranged opposite to the outer side of the fixing seat (20). The negative ion generator (30) is arranged on the fixing seat (20). The negative ion sensing sheet (40) is arranged on the inner side of the hair dryer front cover (10). The system circuit board is arranged in the hair dryer body and is electrically connected to the negative ion sensing sheet (40). When negative ions strike the negative ion sensing sheet (40), a current is generated and transmitted to the system circuit board.

2. The negative ion hair dryer according to claim 1, wherein, The system circuit board includes a current-to-voltage conversion resistor, an analog-to-digital converter, and an MCU. The negative ion sensing sheet and the current-to-voltage conversion resistor are both electrically connected to the input end of the analog-to-digital converter. The output end of the analog-to-digital converter is electrically connected to the MCU.

3. The negative ion hair dryer according to claim 2, wherein The system circuit board further includes a high input impedance amplifier. The input end of the analog-to-digital converter is electrically connected to the output end of the high input impedance amplifier. The input end of the high input impedance amplifier is electrically connected to the negative ion sensing sheet and the current-to-voltage conversion resistor.

4. The negative ion hair dryer according to any one of claims 1-3, characterized in that, The fixing seat (20) includes a peripheral structure (210), a spoke structure (220), and a central structure (230). The peripheral structure (210) is arranged on the inner side of the hair dryer housing. The central structure (230) is arranged at the central position of the fixing seat (20). The peripheral structure (210) is connected to the central structure (230) by the spoke structure (220). Multiple air passages (50) are included between the spoke structures (220).

5. The negative ion hair dryer according to claim 4, wherein, It further includes a heating wire (60) and a temperature sensor (70). The heating wire (60) is installed on the spoke structure (220) around the central structure (230). The negative ion generator (30) is installed on the central structure (230). The tip of the negative ion generator (30) is installed on the central structure (230). The temperature sensor (70) is installed on the spoke structure (220).

6. The negative ion hair dryer according to claim 5, wherein, The hair dryer front cover (10) includes a shielding structure (110), a front cover outer frame (120), an inclined surface (130), and an air passage (50). The shielding structure (110) is provided with a columnar structure (140). A male connector terminal (150) is arranged at the end of the columnar structure (140) away from the shielding. The central structure (230) is provided with a concave structure (240). A female connector terminal (250) is arranged on the concave structure. The male connector terminal (150) is inserted and connected to the female connector terminal (250).

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