An air treatment apparatus and control method

Abstract

An air treatment device and a control method. The air treatment device comprises: a hygroscopic material arranged to adsorb moisture; a heating unit, the hygroscopic material being arranged in the heating unit, the heating unit being arranged to release the moisture adsorbed by the hygroscopic material; a generating material arranged in the heating unit and arranged to split water molecules to generate hydronegative ions; and a fan arranged to form a wind beam flowing from an upstream of the heating unit to a downstream of the heating unit. A hygroscopic process: operating the fan and turning off the heating unit; a hydronegative ion generating process: operating the fan and operating the heating unit. The air treatment device eliminates the operation of manually adding water by the user and does not increase the humidity of the environment, and has better practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric appliances, and in particular to an air treatment device and a control method. BACKGROUND

[0002] According to the theory adopted by the International Association of Geodesy and Geophysics Atmospheric Joint Committee, healthy air negative ions mainly include O2-(H2O)n, OH-(H2O)n, CO4-(H2O)n, etc., which are called "negative alkaline ions" or "hydrated negative ions". The hydrated negative ions have a half-life of 60s and a long life. In life, after a thunderstorm or near a waterfall, people feel that the air is fresh, which is due to the presence of a large number of "hydrated negative ions" in the air.

[0003] The related technology provides a kind of hydrated air negative ion generator, including tourmaline, pure water tank, water volatilization device and fan, pure water tank is filled with pure water, water volatilization device makes pure water in pure water tank volatilize, and the volatilized pure water passes through tourmaline under the action of fan, tourmaline splits water molecules to generate hydrated negative ions, and the hydrated negative ions enter the environment to improve the air quality of the environment.

[0004] The degree of automation of the hydrated air negative ion generator is low, and the user needs to manually add water when the pure water tank is out of water, which is not very practical. SUMMARY

[0005] The application provides an air treatment device, which is more practical.

[0006] The application also provides a control method of an air treatment device.

[0007] The application provides an air treatment device, comprising: a moisture-absorbing material arranged to absorb moisture; a heating unit, wherein the moisture-absorbing material is arranged in the heating unit, and the heating unit is arranged to release the moisture absorbed by the moisture-absorbing material; a generating material arranged in the heating unit and arranged to split water molecules to generate hydrated negative ions; and a fan arranged to form a wind beam flowing from an upstream of the heating unit to a downstream of the heating unit.

[0008] In some example embodiments, the heating unit comprises a first heating member, and the first heating member is provided with a first functional layer, and the first functional layer comprises the moisture-absorbing material and the generating material.

[0009] In some example embodiments, the first functional layer comprises a mixing layer, and the mixing layer is arranged on at least one of an upstream side and a downstream side of the first heating member, and the composition of at least one layer of the mixing layer comprises the moisture-absorbing material and the generating material.

[0010] In some example embodiments, the composition of the at least one layer of the mixed layer further includes a binder, and the weight ratio of the hygroscopic material, the generating material, and the binder in the at least one layer of the mixed layer is 3% to 90%, 9.5% to 77%, and 0.5% to 20%, respectively.

[0011] In some example embodiments, the first functional layer includes a hygroscopic layer disposed on the upstream side of the first heating member and including the hygroscopic material, and a generating layer disposed on the downstream side of the first heating member and including the generating material.

[0012] In some example embodiments, the size ratio of the hygroscopic layer to the generating layer in the blowing direction of the air beam is 1:9 to 9:1.

[0013] In some example embodiments, the first functional layer includes a hygroscopic layer disposed on the upstream side of the first heating member and including the hygroscopic material, and a generating layer disposed on the downstream side of the first heating member and including the generating material.

[0014] In some example embodiments, the weight ratio of the hygroscopic material to the generating material is (30-70):(27-67).

[0015] In some example embodiments, the heating unit includes a first heating member provided with a first functional layer, the first functional layer being a hygroscopic layer including the hygroscopic material, and a second heating member disposed downstream of the first heating member, the second heating member being provided with a second functional layer, the second functional layer being a generating layer including the generating material.

[0016] In some example embodiments, an adhesion strength improving layer for improving adhesion strength is disposed between the second heating member and the second functional layer.

[0017] In some example embodiments, an adhesion strength improving layer for improving adhesion strength is disposed between the first heating member and the first functional layer.

[0018] In some example embodiments, the composition of the adhesion strength improving layer includes at least one of silica sol, alumina sol, pseudo-boehmite, and bentonite.

[0019] In some example embodiments, the second heating member includes at least one of a thermistor and a graphene heating film.

[0020] In some example embodiments, the first heating member includes a honeycomb structure thermistor.

[0021] In some example embodiments, a temperature detection unit is arranged downstream of the first heating member.

[0022] In some example embodiments, the hygroscopic material comprises at least one of a molecular sieve, activated alumina, silica gel, and a metal organic framework.

[0023] In some example embodiments, the generating material comprises at least one of tourmaline and negative ion powder.

[0024] In some example embodiments, the fan is arranged upstream or downstream of the heating unit.

[0025] In some example embodiments, the air treatment device further comprises a humidity detection unit arranged to detect humidity of air upstream of the hygroscopic material and humidity of air downstream of the hygroscopic material, and a control unit, the humidity detection unit, the fan, and the heating unit are electrically connected to the control unit.

[0026] Embodiments of the present application also provide a control method of an air treatment device, comprising:

[0027] a hygroscopic process: operating the fan and turning off the heating unit;

[0028] a generating hydrated negative ion process: operating the fan and operating the heating unit.

[0029] In some example embodiments, in the hygroscopic process, the fan operates at a first set speed; in the generating hydrated negative ion process, the fan operates at a second set speed, and the second set speed is not greater than the first set speed.

[0030] In some example embodiments, the first set speed is A, and the second set speed is 0.05*A to 0.25*A.

[0031] In some example embodiments, the control method further comprises: in the hygroscopic process, based on the fan operating for a first set time, turning off the fan or performing the generating hydrated negative ion process.

[0032] In some example embodiments, the control method further comprises: in the hygroscopic process, obtaining humidity of air upstream and downstream of the hygroscopic material, and based on a difference between the humidity of air upstream and downstream of the hygroscopic material reaching a first set value, turning off the fan or performing the generating hydrated negative ion process.

[0033] In some example embodiments, the heating unit comprises a first heating member, and a temperature detecting unit is arranged downstream of the first heating member, and the control method further comprises: during the generating of the hydrated negative ions, acquiring the temperature downstream of the first heating member, and controlling the first heating member according to the temperature, so that the temperature downstream of the first heating member is maintained at a set temperature for a second set time period, and then the first heating member is turned off or the moisture absorption process is performed.

[0034] In some example embodiments, the heating unit further comprises a second heating member, and the control method further comprises: during the generating of the hydrated negative ions, controlling the second heating member to heat at a set heating temperature, and turning off the second heating member when the first heating member is turned off.

[0035] In some example embodiments, the set temperature is 75°C to 150°C, and the set heating temperature is 60°C to 120°C.

[0036] In some example embodiments, the heating unit comprises a first heating member, and a temperature detecting unit is arranged downstream of the first heating member, and the control method further comprises: during the generating of the hydrated negative ions, acquiring the temperature downstream of the first heating member, and controlling the first heating member according to the temperature, so that the temperature downstream of the first heating member is maintained at a set temperature for a second set time period, and then the first heating member is turned off or the moisture absorption process is performed.

[0037] In some example embodiments, for any two adjacent stages, the set temperature downstream of the first heating member in the later stage is greater than or equal to the set temperature downstream of the first heating member in the former stage.

[0038] In some example embodiments, the temperature downstream of the first heating member is maintained at a corresponding set temperature in five stages.

[0039] In the first stage, the set temperature downstream of the first heating member is 30°C to 40°C, and the duration is 2 min to 20 min.

[0040] In the second stage, the set temperature downstream of the first heating member is 40°C to 50°C, and the duration is 2 min to 20 min.

[0041] In the third stage, the set temperature downstream of the first heating member is 50°C to 60°C, and the duration is 2 min to 20 min.

[0042] In the fourth stage, the set temperature downstream of the first heating member is 60°C to 75°C, and the duration is 2 min to 20 min.

[0043] The fifth stage: the set temperature downstream of the first heating member is 75-150 DEG C, and the duration is 2-20 min.

[0044] In some example embodiments, the heating unit further comprises a second heating member, and the control method further comprises: controlling the second heating member to set a heating temperature for heating, and closing the second heating member when the first heating member is closed.

[0045] In some example embodiments, the set heating temperature is 60-120 DEG C.

[0046] Compared with the related art, the air treatment device provided in the application has the following advantages: in the moisture absorption process, the fan is operated, the heating unit is closed, and the ambient air forms a wind beam that blows from the upstream of the heating unit to the downstream of the heating unit under the action of the fan, and the moisture absorption material absorbs and stores the moisture in the wind beam; in the water anion generation process, the fan is operated, the ambient air forms a wind beam that blows from the upstream of the heating unit to the downstream of the heating unit under the action of the fan, and the heating unit is operated, the heating unit concentrates the moisture absorbed by the moisture absorption material, and a large amount of moisture is released, in the process of passing through the generation material, a large amount of water anions are generated by the generation material cracking the water molecules, and the water anions are blown to the environment with the wind beam, thereby improving the air quality of the environment; the air treatment device provided in the application eliminates the operation of manually adding water by the user, does not increase the humidity of the environment, and has better practicability.

[0047] Other features and advantages of the application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. Other advantages of the application will be realized and attained by the solution described in the specification and claims. BRIEF DESCRIPTION OF DRAWINGS

[0048] The accompanying drawings are used to provide an understanding of the technical solutions of the application, and constitute a part of the specification, and are used to explain the technical solutions of the application together with the embodiments of the application, and do not constitute a limitation on the technical solutions of the application.

[0049] Figure 1 The structural schematic diagram of the air treatment device provided in some embodiments of the application is shown in the following figure:

[0050] Figure 2 The structural schematic diagram of the air treatment device provided in some embodiments of the application is shown in the following figure: Figure 1 The structural schematic diagram of the air treatment device provided in some embodiments of the application is shown in the following figure:

[0051] Figure 3 The structural schematic diagram of the air treatment device provided in some embodiments of the application is shown in the following figure: Figure 1 The structural schematic diagram of the air treatment device provided in some embodiments of the application is shown in the following figure:

[0052] Figure 4A structural schematic of an air treatment device provided for some embodiments of the present application;

[0053] Figure 5 A flow chart of a control method of an air treatment device provided for some embodiments of the present application;

[0054] Figure 6 A flow chart of a control method of an air treatment device provided for some embodiments of the present application.

[0055] Wherein, the correspondence between the reference signs and the component names is:

[0056] 110 first heating member, 120 second heating member, 200 fan, 310 mixing layer, 320 moisture absorption layer, 330 generation layer, 400 temperature detection unit, 500 humidity detection unit. DETAILED DESCRIPTION

[0057] The present application describes a plurality of embodiments, but the description is exemplary rather than limiting, and it will be apparent to those of ordinary skill in the art that there can be many more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible combinations of features are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are possible. Unless specifically intended to be limited, any feature or element of any embodiment can be used with any other feature or element of any other embodiment, or in any other embodiment.

[0058] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application can also be combined with any conventional features or elements to form unique inventive solutions that are defined by the claims. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution that is defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application can be implemented alone or in any appropriate combination. Accordingly, the embodiments are not to be limited by other than according to the claims made and their equivalents. Moreover, various modifications and changes can be made within the scope of the claims.

[0059] Furthermore, in describing representative embodiments, the specification can have presented the method and / or process as a particular sequence of steps. However, to the extent that the method or process depends on the particular order of steps, this description should not be construe to imply that the steps are necessarily performed in this order. Other steps can be performed in between described steps without departing from the scope of the application as described. Thus, indications of a particular order of steps should not be understood to imply that these steps are necessarily order dependent. Additionally, the described steps can be performed concurrently, in parallel, or in any order that is appropriate for the particular implementation.

[0060] The present application provides an air treatment device, such as Figures 1 to 4 As shown in the drawings, the air treatment device comprises: a moisture absorbing material, the moisture absorbing material is arranged to absorb moisture; a heating unit, the moisture absorbing material is arranged in the heating unit, the heating unit is arranged to release the moisture absorbed by the moisture absorbing material; a generating material, the generating material is arranged in the heating unit, the generating material is arranged to split water molecules to generate hydronegative ions; and a fan 200, the fan 200 is arranged to form an air beam flowing from an upstream of the heating unit to a downstream of the heating unit.

[0061] Moisture absorbing process: the fan 200 is running, the heating unit is closed, and the ambient air forms an air beam flowing from the upstream of the heating unit to the downstream of the heating unit under the action of the fan 200, and the moisture absorbing material absorbs and stores the moisture in the air beam.

[0062] Hydronegative ion generating process: the fan 200 is running, the ambient air forms an air beam flowing from the upstream of the heating unit to the downstream of the heating unit under the action of the fan 200, the heating unit is running, the heating unit releases the moisture absorbed by the moisture absorbing material in a concentrated manner, a large amount of moisture is released, and in the process of passing through the generating material, the generating material splits water molecules to generate a large amount of hydronegative ions, the hydronegative ions are blown into the environment with the air beam, and the air quality of the environment is improved.

[0063] The air treatment device eliminates the operation of manually adding water by the user and does not increase the humidity of the environment, and is more practical.

[0064] In some example embodiments, as shown in the drawings, the heating unit comprises: a first heating piece 110, the first heating piece 110 is provided with a first functional layer, and the first functional layer comprises the moisture absorbing material and the generating material. Figures 1 to 3

[0065] In some examples, the first heating piece 110 can be an electric auxiliary heating device of the air treatment device, for example, a PTC heating piece originally provided in an air conditioner, and the moisture absorbing material and / or the moisture absorbing material can be arranged on the metal sheet of the electric auxiliary heating device.​

[0066] In some examples, as shown in FIG. 1, the first functional layer includes a blending layer 310, which is arranged at at least one of the upstream side and the downstream side of the first heating element 110, and the composition of at least one layer of the blending layer 310 includes both the hygroscopic material and the generating material. Figure 2

[0067] Hygroscopic process: the fan 200 is running, and the first heating element 110 is off. Under the action of the fan 200, the ambient air forms a wind beam that blows from the upstream of the first heating element 110 to the downstream of the first heating element 110. In the process of passing through the hygroscopic material, the hygroscopic material adsorbs and stores the moisture in the wind beam.

[0068] Generating hydronegative ion process: the fan 200 is running, and the first heating element 110 is running. Under the action of the fan 200, the ambient air forms a wind beam that blows from the upstream of the first heating element 110 to the downstream of the first heating element 110. The first heating element 110 releases the moisture adsorbed by the hygroscopic material in a concentrated manner. In the process of passing through the generating material, the generating material splits the water molecules to generate a large amount of hydronegative ions. The hydronegative ions are blown into the environment along with the wind beam, which improves the air quality of the environment.

[0069] In some embodiments, the composition of each layer of the blending layer 310 includes both the hygroscopic material, the generating material, and the binder. The weight percentage of the hygroscopic material can be 3% to 90%, the weight percentage of the generating material can be 9.5% to 77%, and the weight percentage of the binder can be 0.5% to 20%.

[0070] In some embodiments, the weight percentage of the binder is set to 5%, the weight percentage of the hygroscopic material is set to 60%, and the weight percentage of the generating material is set to 35%. In this scheme, the concentration of the negative ions generated is 1200 to 1900 million / m 3 .

[0071] In other embodiments, the weight percentage of the binder is set to 5%, the weight percentage of the hygroscopic material is set to 30%, and the weight percentage of the generating material is set to 65%. In this scheme, the concentration of the negative ions generated is 800 to 1700 million / m 3 .

[0072] In a comparative embodiment, the weight percentage of the binder is set to 5%, the weight percentage of the hygroscopic material is set to 92%, and the weight percentage of the generating material is set to 3%. In this scheme, the concentration of the negative ions generated is 200 to 350 million / m 3 .

[0073] ​Through a large number of experiments, it is found that: the weight proportion of the hygroscopic material is set to 35% to 70%, the weight proportion of the generated material is set to 27% to 62%, and the weight proportion of the binder is set to 3% to 10%, so that the concentration of negative ions generated is relatively high, and a large number of hydrated negative ions are contained in the negative ions. The temperature of the wind beam at the downstream of the first heating element 110 is maintained at 75°C to 150°C, and the temperature control mode of the first heating element 110 is the same during the experiment.

[0074] In some examples, as shown in FIG. 1, the first functional layer includes: a hygroscopic layer 320, which is located on the upstream side of the first heating element 110 and includes a hygroscopic material; and a generated layer 330, which is located on the downstream side of the first heating element 110 and includes a generated material. Figure 1

[0075] Hygroscopic process: the fan 200 is running, and the first heating element 110 is turned off. Under the action of the fan 200, the ambient air forms a wind beam that blows from the upstream of the first heating element 110 to the downstream of the first heating element 110. The wind beam first passes through the hygroscopic material, and in the process of passing through the hygroscopic material, the hygroscopic material adsorbs and stores the moisture in the wind beam.

[0076] Generated hydrated negative ion process: the fan 200 is running, and under the action of the fan 200, the ambient air forms a wind beam that blows from the upstream of the first heating element 110 to the downstream of the first heating element 110. The first heating element 110 is running, and the first heating element 110 causes the hygroscopic material to release the adsorbed moisture in a concentrated manner. A large amount of moisture released passes through the generated material, and in the process of passing through the generated material, the generated material splits water molecules to generate a large amount of hydrated negative ions. The hydrated negative ions are blown into the environment with the wind beam, thereby improving the air quality of the environment.

[0077] The size (i.e., the height along the blowing direction of the wind beam) of the hygroscopic layer 320 and the size (i.e., the height along the blowing direction of the wind beam) of the generated layer 330 along the blowing direction of the wind beam can be in a ratio of 1:9 to 9:1.

[0078] In some embodiments, the size of the hygroscopic layer 320 accounts for 60% along the blowing direction of the wind beam, and the size of the generated layer 330 accounts for 40%. In this scheme, the concentration of negative ions generated is 12 to 15 million / m 3 .

[0079] In some embodiments, the size of the hygroscopic layer 320 accounts for 85% along the blowing direction of the wind beam, and the size of the generated layer 330 accounts for 15%. In this scheme, the concentration of negative ions generated is 6 to 10 million / m 3 .

[0080] ​In some other embodiments, the size ratio of the moisture absorption layer 320 to the generation layer 330 along the blowing direction of the air flow is set to 25:75, and the concentration of the negative ions generated by this scheme is 5-8 million / m 3 .

[0081] In the comparative example, the size ratio of the moisture absorption layer 320 to the generation layer 330 along the blowing direction of the air flow is set to 95:5, and the concentration of the negative ions generated by this scheme is 1-2.2 million / m 3 .

[0082] Through a large number of experiments, it is found that the size ratio of the moisture absorption layer 320 to the generation layer 330 along the blowing direction of the air flow is (35-65):(65-35), and the concentration of the negative ions generated by this scheme is relatively high, and these negative ions contain a large number of hydrated negative ions. The temperature of the air flow downstream of the first heating element 110 is maintained at 75-150°C, and the temperature control mode of the first heating element 110 is the same during the experiment.

[0083] In some other examples, as shown in Figure 3 , the first functional layer includes: a moisture absorption layer 320 provided on the first heating element 110 and including a moisture absorption material; and a generation layer 330 provided on the side of the moisture absorption layer 320 away from the first heating element 110 and including a generation material (of course, the generation layer 330 and the moisture absorption layer 320 downstream can be exchanged in order, of course, the generation layer 330 and the moisture absorption layer 320 upstream can be exchanged in order, of course, only the generation layer 330 and the moisture absorption layer 320 can be provided on the upstream side of the first heating element 110, of course, only the generation layer 330 and the moisture absorption layer 320 can be provided on the downstream side of the first heating element 110, etc.).

[0084] Moisture absorption process: the fan 200 is running, the first heating element 110 is closed, and the ambient air forms an air flow that blows from the upstream of the first heating element 110 to the downstream of the first heating element 110 under the action of the fan 200, in the process of passing through the moisture absorption material, the moisture absorption material adsorbs and stores the moisture in the air flow.

[0085] Generation of hydrated negative ions: the fan 200 is running, and the ambient air forms an air flow that blows from the upstream of the first heating element 110 to the downstream of the first heating element 110 under the action of the fan 200, the first heating element 110 is running, the first heating element 110 causes the moisture adsorbed by the moisture absorption material to be released in a concentrated manner, a large amount of moisture is released in the process of passing through the generation material, the generation material splits the water molecules to generate a large amount of hydrated negative ions, and the hydrated negative ions are blown into the environment with the air flow to improve the air quality of the environment.

[0086] Preferably, the upstream side and the downstream side of the first heating element 110 are sequentially provided with the hygroscopic layer 320 and the generating layer 330, so that the concentration of the generated negative ions is relatively high.

[0087] The weight ratio of the hygroscopic material to the generating material can be (60-94):(3-25), and the hygroscopic material is mixed with a binder, and the generating material is also mixed with a binder.

[0088] In some embodiments, the weight percentage of the binder is set to 5%, the weight percentage of the hygroscopic material is set to 88%, and the weight percentage of the generating material is set to 7%. In this scheme, the concentration of the generated negative ions is 1100-1800 million / m 3 .

[0089] In the comparative example, the weight percentage of the binder is set to 5%, the weight percentage of the hygroscopic material is set to 50%, and the weight percentage of the generating material is set to 45%. In this scheme, the concentration of the generated negative ions is 500-800 million / m 3 .

[0090] Through a large number of experiments, it is found that the weight ratio of the hygroscopic material to the generating material is (75-90):(7-22), so that the concentration of the generated negative ions is relatively high, and these negative ions contain a large number of hydrated negative ions. The temperature of the wind beam at the downstream of the first heating element 110 is maintained at 75-150℃, and the temperature control mode of the first heating element 110 is the same during the experiment.

[0091] In other exemplary embodiments, as shown in Figure 4 the heating unit includes: a first heating element 110, the first heating element 110 is provided with a first functional layer, the first functional layer is a hygroscopic layer 320, and the hygroscopic layer 320 includes a hygroscopic material; and a second heating element 120, the second heating element 120 is arranged downstream of the first heating element 110, and the second heating element 120 is provided with a second functional layer, the second functional layer is a generating layer 330, and the generating layer 330 includes a generating material. At least one of the upstream side and the downstream side of the first heating element 110 is provided with the hygroscopic layer 320, and at least one of the upstream side and the downstream side of the second heating element 120 is provided with the generating layer 330.

[0092] Hygroscopic process: the fan 200 is running, and the first heating element 110 and the second heating element 120 are both closed. Under the action of the fan 200, the ambient air forms a wind beam that blows from the upstream of the first heating element 110 to the downstream of the second heating element 120. The wind beam first passes through the hygroscopic material, and in the process of passing through the adsorbent material, the hygroscopic material adsorbs and stores the moisture in the wind beam.

[0093] The process of generating hydrated negative ions: the fan 200 is running, and the ambient air is blown by the fan 200 to form a wind beam from the upstream of the first heating element 110 to the downstream of the second heating element 120, the first heating element 110 and the second heating element 120 are both running, the first heating element 110 makes the hygroscopic material release the water adsorbed by the hygroscopic material, and a large amount of water is released with the wind beam passing through the generating material, and in the process of passing through the generating material, the generating material cracks the water molecules to generate a large amount of hydrated negative ions, and the hydrated negative ions are blown to the environment with the wind beam, thereby improving the air quality of the environment. The second heating element 120 is used to heat the generating material adaptively, which can improve the generation amount of hydrated negative ions.

[0094] The heating temperature of the second heating element 120 can be maintained at 60-120°C.

[0095] In some examples, the first heating element 110 and the second heating element 120 can be separately arranged or integrally arranged. The first heating element 110 and the second heating element 120 can be electric auxiliary heating devices of an air treatment device, such as PTC heating elements in an air conditioner, and the hygroscopic material and / or the generating material can be arranged on the metal sheet of the electric auxiliary heating device.

[0096] In some embodiments, the weight percentage of the binder is set to 5%, the weight percentage of the hygroscopic material is set to 60%, the weight percentage of the generating material is set to 35%, the heating temperature of the second heating element 120 is maintained at 90°C, and the concentration of the negative ions generated by this scheme is 25-29 million / m 3 .

[0097] In other embodiments, the weight percentage of the binder is set to 5%, the weight percentage of the hygroscopic material is set to 60%, the weight percentage of the generating material is set to 35%, the heating temperature of the second heating element 120 is maintained at 40°C, and the concentration of the negative ions generated by this scheme is 8-13 million / m 3 .

[0098] Through a large number of experiments, it is found that when the heating temperature of the second heating element 120 is maintained at 80-100°C, the concentration of the generated negative ions is relatively high, and these negative ions contain a large amount of hydrated negative ions. The temperature of the wind beam downstream of the first heating element 110 is maintained at 75-150°C, and the temperature control mode of the first heating element 110 is the same during the experiment.

[0099] In some example embodiments, as Figure 1 and Figure 4As shown, the first heating member 110 includes a honeycomb structure of thermistors, ensuring that the first heating member 110 has good ventilation. Since the thermistors are metal components, the adhesion of the hygroscopic material and / or the generated material on the thermistors is poor, and the frequent heating and cooling of the thermistors can easily cause the hygroscopic material and / or the generated material to fall off. Therefore, an adhesion strength enhancing layer is first provided on the thermistors, and then the hygroscopic material and / or the generated material is provided on the adhesion strength enhancing layer to enhance the adhesion strength of the hygroscopic material and / or the generated material, so that the hygroscopic material and / or the generated material is less likely to fall off.

[0100] In some example embodiments, as shown in Figure 4 As shown, the second heating member 120 includes at least one of a thermistor and a graphene heating film. When the second heating member 120 includes a thermistor, an adhesion strength enhancing layer can also be provided on the surface of the second heating member 120, and then the generated material is provided on the adhesion strength enhancing layer to enhance the adhesion strength of the generated material, thereby solving the problem of easy falling off of the generated material.

[0101] In some embodiments, the adhesion strength enhancing layer can be made by a process of impregnation, drying and calcination. The composition of the adhesion strength enhancing layer can include at least one of silica sol, aluminum sol, pseudo-boehmite and bentonite, all of which can achieve the purpose of the present application without deviating from the design idea of the present application, and are not repeated here, and all should be within the protection scope of the present application.

[0102] The hygroscopic material can include at least one of molecular sieves, activated alumina, silica gel and metal organic frameworks; the composition of the generated material can include at least one of tourmaline and negative ion powder, which can be tourmaline powder, modified tourmaline powder, rare earth element powder, etc.; the fan 200 can be located upstream or downstream of the heating unit; all of the above can achieve the purpose of the present application without deviating from the design idea of the present application, and are not repeated here, and all should be within the protection scope of the present application.

[0103] In some embodiments, as shown in Figure 1 and Figure 4 The fan 200 is located downstream of the first heating member 110, and the fan 200 forms a wind beam flowing from the upstream of the first heating member 110 to the downstream of the first heating member 110 in a negative pressure suction manner. In other embodiments, the fan 200 is located upstream of the first heating member 110, and the fan 200 forms a wind beam flowing from the upstream of the first heating member 110 to the downstream of the first heating member 110 in a positive pressure blowing manner.

[0104] In some example embodiments, as shown in Figure 1 and Figure 4As shown, the temperature detection unit 400 is arranged downstream of the first heating member 110 and is configured to detect the temperature of the air flow downstream of the first heating member 110. In this way, the temperature of the air flow downstream of the first heating member 110 can be controlled by adjusting the heating power of the first heating member 110 according to the temperature data detected by the temperature detection unit 400, so as to control the generation speed of the hydrated negative ions.

[0105] In some example embodiments, as shown in Figure 1 and Figure 4 As shown, the air treatment device further comprises a humidity detection unit 500 configured to detect the humidity of the air upstream of the hygroscopic material and the humidity of the air downstream of the hygroscopic material, and a control unit, wherein the humidity detection unit 500, the fan 200 and the heating unit are electrically connected to the control unit.

[0106] During the hygroscopic process, the humidity detection unit 500 obtains the humidity of the air upstream and downstream of the hygroscopic material, and the control unit closes the fan 200 or performs the process of generating hydrated negative ions when the humidity difference between the air upstream and downstream of the hygroscopic material reaches a first set value. The first set value can be set to be not greater than 3%, at which time the hygroscopic material is basically saturated with water, so that the control unit can be used to close the fan 200 to save energy, and of course the control unit can also be used to perform the process of generating hydrated negative ions to improve the air quality of the environment.

[0107] In some embodiments, as shown in Figure 1 and Figure 4 As shown, the humidity detection unit 500 comprises a first humidity sensor and a second humidity sensor, and the first humidity sensor and the second humidity sensor are respectively arranged upstream and downstream of the first heating member 110, and the first humidity sensor and the second humidity sensor are electrically connected to the control unit. Specifically, the first humidity sensor is arranged upstream of the first heating member 110, and the second humidity sensor is arranged downstream of the first heating member 110; during the hygroscopic process, the control unit controls the fan 200 to operate, and the environmental air flows from the upstream of the first heating member 110 to the downstream of the first heating member 110 under the action of the fan 200, the first humidity sensor detects the humidity of the air flow upstream of the first heating member 110, and the second humidity sensor detects the humidity of the air flow downstream of the first heating member 110. Since the hygroscopic material adsorbs the water in the air flow during the process of passing through the first heating member 110, the percentage of the humidity of the air flow detected by the first humidity sensor upstream of the first heating member 110 is not less than the percentage of the humidity of the air flow detected by the second humidity sensor downstream of the first heating member 110.

[0108] In some embodiments, the air treatment device further comprises a housing (not shown in the figures) having an air passage, the heating unit and the fan 200 are arranged in the air passage. The fan 200 operates, and the ambient air enters the air passage from an air inlet of the air passage, and then passes through the heating unit, the moisture absorption material and the generating material, and is discharged from an air outlet of the air passage back to the environment.

[0109] The air treatment device provided by the present application can generate 5 million to 30 million negative ions per cubic centimeter, and the negative ions contain a large amount of hydrated negative ions.

[0110] The air treatment device includes an air conditioner, an air purifier and the like.

[0111] The embodiment of the present application further provides a control method of the air treatment device, as shown in Figure 5 and Figure 6 , the control method comprises the following steps.

[0112] The moisture absorption process: the fan 200 operates, and the heating unit is turned off.

[0113] The generating hydrated negative ion process: the fan 200 operates, and the heating unit operates.

[0114] The moisture absorption process: the fan 200 operates, and the heating unit is turned off. Under the action of the fan 200, the ambient air forms a wind beam that blows from the upstream of the heating unit to the downstream of the heating unit, and the moisture absorption material adsorbs and stores the moisture in the wind beam.

[0115] The generating hydrated negative ion process: the fan 200 operates, and the heating unit operates. Under the action of the fan 200, the ambient air forms a wind beam that blows from the upstream of the heating unit to the downstream of the heating unit. The heating unit releases the moisture adsorbed by the moisture absorption material in a concentrated manner. A large amount of moisture is released in the process of passing through the generating material, and a large amount of hydrated negative ions are generated by the splitting of water molecules in the generating material. The hydrated negative ions are blown to the environment along with the wind beam, thereby improving the air quality of the environment.

[0116] The control method of the air treatment device eliminates the manual water adding operation of the user, does not increase the environmental humidity, and has better practicability.

[0117] In some examples, in the moisture absorption process, the operating speed of the fan 200 is a first set speed; in the generating hydrated negative ion process, the operating speed of the fan 200 is a second set speed, and the second set speed is not greater than the first set speed. In the generating hydrated negative ion process, the operating speed of the fan 200 is reduced, which is beneficial to the more sufficient contact between the moisture released by the moisture absorption material and the generating material, prolongs the contact time between the moisture released by the moisture absorption material and the generating material, and thus the generation amount of the hydrated negative ions can be improved.

[0118] In some embodiments, as shown in Figure 5 and Figure 6 , the first set speed is A, and the second set speed is 0.05*A to 0.25*A. In the process of generating hydrated negative ions, more hydrated negative ions can be generated, and the environmental air quality improvement effect is better.

[0119] In some examples, the control method further includes: in the dehumidification process, based on the running time of the fan 200 reaching a first set time, the fan 200 is turned off or the process of generating hydrated negative ions is performed. By reasonably setting the first set time, it is ensured that the moisture adsorbed by the dehumidification material reaches saturation or is basically saturated in the dehumidification process, and then the fan 200 is turned off to save energy (or the process of generating hydrated negative ions is performed to improve the environmental air quality).

[0120] In other examples, as shown in Figure 5 and Figure 6 , the control method further includes: in the dehumidification process, the air humidity upstream and downstream of the dehumidification material is obtained, and based on the air humidity difference between the upstream and downstream of the dehumidification material reaching a first set value, the fan 200 is turned off or the process of generating hydrated negative ions is performed. It can be that the first set value is set to be not greater than 3%, at which time the moisture adsorbed by the dehumidification material is saturated or is basically saturated, and therefore the fan 200 is turned off to save energy (or the process of generating hydrated negative ions is performed to improve the environmental air quality).

[0121] It can be that the first set value is set to be 3%; or it can be that the first set value is set to be 2%; or it can be that the first set value is set to be 1%, etc.; all of the above can achieve the purpose of the present application, and the purpose does not deviate from the design idea of the present application, and will not be repeated here, and all should be within the protection scope of the present application.

[0122] In some examples, the heating unit includes a first heating element 110, and a temperature detection unit 400 is arranged downstream of the first heating element 110. The control method further includes: during the generation of the hydrated negative ions, obtaining the temperature downstream of the first heating element 110, and controlling the first heating element 110 according to the temperature so that the temperature downstream of the first heating element 110 is maintained at a set temperature for a second set time period, and then the first heating element 110 is turned off or the moisture absorption process is performed. During the generation of the hydrated negative ions, the first heating element 110 is controlled according to the temperature detected by the temperature detection unit 400 so that the temperature downstream of the first heating element 110 is maintained at the set temperature for the second set time period, so that the moisture absorption material releases all or substantially all of the absorbed moisture, and the released moisture is split to generate hydrated negative ions under the action of the generation material, and then the first heating element 110 is turned off to save energy consumption. If the environmental air quality is not improved, the fan 200 is turned off to save energy consumption. If the environmental air quality is still improved, the moisture absorption process and the generation of hydrated negative ions are performed in sequence. The set temperature is 75-150°C, which can improve the generation amount of hydrated negative ions. The second set time period can be determined according to experiments.

[0123] The set temperature can be set to 75°C, or the set temperature can be set to 115°C, or the set temperature can be set to 150°C, etc. The above can achieve the purpose of the present application, and the purpose does not deviate from the design idea of the present application. Details are not repeated here, and all should be within the protection scope of the present application.

[0124] Further, the heating unit further includes a second heating element 120, and the control method further includes: during the generation of the hydrated negative ions, the second heating element 120 is controlled to heat at a set heating temperature, and the second heating element 120 is turned off when the first heating element 110 is turned off. The second heating element 120 is controlled to heat at a set heating temperature, and the generation amount of hydrated negative ions can be improved by reasonably setting the set heating temperature. The set heating temperature is 60-120°C.

[0125] The set heating temperature can be set to 60°C, or the set heating temperature can be set to 90°C, or the set heating temperature can be set to 120°C, etc. The above can achieve the purpose of the present application, and the purpose does not deviate from the design idea of the present application. Details are not repeated here, and all should be within the protection scope of the present application.

[0126] In other examples, as Figure 5As shown, the heating unit comprises a first heating member 110, and a temperature detecting unit 400 is arranged downstream of the first heating member 110. The control method further comprises: obtaining the temperature downstream of the first heating member 110 during the generation of the hydrated negative ions, and controlling the first heating member 110 according to the temperature so as to maintain the temperature downstream of the first heating member 110 at a corresponding set temperature in stages, and then turning off the first heating member 110 or performing the moisture absorption process.

[0127] During the generation of the hydrated negative ions, the first heating member 110 is controlled according to the temperature detected by the temperature detecting unit 400 so as to maintain the temperature downstream of the first heating member 110 at a corresponding set temperature in stages, and the hydrated negative ions are regenerated in stages (i.e. in stages). After the moisture absorption material releases all or substantially all of the absorbed moisture, the first heating member 110 is turned off to save energy. If the improvement of the air quality of the environment is not performed, the fan 200 is turned off to save energy. If the improvement of the air quality of the environment is still performed, the moisture absorption process and the generation of the hydrated negative ions are performed in turn.

[0128] Further, the set temperature downstream of the first heating member 110 in the later stage is greater than or equal to the set temperature downstream of the first heating member 110 in the former stage. That is, during the generation of the hydrated negative ions, the temperature of the moisture absorption material is increased in stages, which can prolong the release time of the hydrated negative ions.

[0129] In an embodiment, the temperature downstream of the first heating member 110 is maintained at a corresponding set temperature in five stages. In the first stage, the set temperature downstream of the first heating member 110 is 30-40°C, and the duration is 2-20 min. In the second stage, the set temperature downstream of the first heating member 110 is 40-50°C, and the duration is 2-20 min. In the third stage, the set temperature downstream of the first heating member 110 is 50-60°C, and the duration is 2-20 min. In the fourth stage, the set temperature downstream of the first heating member 110 is 60-75°C, and the duration is 2-20 min. In the fifth stage, the set temperature downstream of the first heating member 110 is 75-150°C, and the duration is 2-20 min. This scheme can prolong the release time of the hydrated negative ions by regenerating the hydrated negative ions in stages during the generation of the hydrated negative ions.

[0130] Further, as shown in FIG. 1, the heating unit further comprises a second heating member 120 arranged downstream of the first heating member 110. The second heating member 120 is arranged to heat the moisture absorption material to a temperature higher than the set temperature downstream of the first heating member 110. Figure 6As shown, the heating unit further comprises a second heating element 120, and the control method further comprises: controlling the second heating element 120 to heat at a set heating temperature, and closing the second heating element 120 when the first heating element 110 is closed. Controlling the second heating element 120 to heat at a set heating temperature can improve the generation amount of hydrated negative ions by reasonably setting the set heating temperature. The set heating temperature is 60-120°C.

[0131] The set heating temperature can be set to 60°C, or the set heating temperature can be set to 90°C, or the set heating temperature can be set to 120°C, etc. The above can achieve the purpose of the present application, and the purpose does not deviate from the design idea of the present application. Therefore, it is not repeated here, and it should be within the protection scope of the present application.

[0132] In an embodiment, as shown in Figure 5 A control method of an air treatment device, comprising:

[0133] The humidity absorption process comprises:

[0134] The fan 200 operates at a speed A, and the first heating element 110 is closed.

[0135] The air humidity B1 upstream of the first heating element 110 and the air humidity B2 downstream of the first heating element 110 are obtained.

[0136] If B1-B2 is not greater than 3%, the hydrated negative ion generation process is performed.

[0137] The hydrated negative ion generation process comprises:

[0138] The fan 200 operates at a speed of 0.25*A, and the first heating element 110 is operated.

[0139] The temperature downstream of the first heating element 110 is obtained, and the first heating element 110 is controlled according to the temperature to sequentially maintain the temperature downstream of the first heating element 110 at 30-40°C for 2-20 min, maintain the temperature downstream of the first heating element 110 at 40-50°C for 2-20 min, maintain the temperature downstream of the first heating element 110 at 50-60°C for 2-20 min, maintain the temperature downstream of the first heating element 110 at 60-75°C for 2-20 min, and maintain the temperature downstream of the first heating element 110 at 75-150°C for 2-20 min, and then perform the humidity absorption process.

[0140] In another embodiment, as shown in Figure 6 A control method of an air treatment device, comprising:

[0141] The humidity absorption process comprises:

[0142] The fan 200 operates at a rotation speed A, the first heating element 110 and the second heating element 120 are closed;

[0143] The air humidity B1 upstream of the first heating element 110 and the air humidity B2 downstream thereof are obtained;

[0144] Based on B1-B2 being not greater than 3%, the process of generating hydrated negative ions is performed;

[0145] The process of generating hydrated negative ions is as follows:

[0146] The fan 200 operates at a rotation speed 0.25*A, the first heating element 110 operates, the second heating element 120 operates and is heated to 90°C;

[0147] The temperature downstream of the first heating element 110 is obtained, and the first heating element 110 is controlled according to the temperature to sequentially achieve that the temperature downstream of the first heating element 110 is maintained at 30°C to 40°C for 2 min to 20 min, the temperature downstream of the first heating element 110 is maintained at 40°C to 50°C for 2 min to 20 min, the temperature downstream of the first heating element 110 is maintained at 50°C to 60°C for 2 min to 20 min, the temperature downstream of the first heating element 110 is maintained at 60°C to 75°C for 2 min to 20 min, and the temperature downstream of the first heating element 110 is maintained at 75°C to 150°C for 2 min to 20 min, and then the process of absorbing moisture is performed.

[0148] In summary, the air treatment device provided by the application has the following advantages. In the process of absorbing moisture, the fan operates, the heating element is closed, and the ambient air forms a wind beam that blows from the upstream of the heating element to the downstream thereof under the action of the fan, and the hygroscopic material adsorbs and stores the moisture in the wind beam. In the process of generating hydrated negative ions, the fan operates, the ambient air forms a wind beam that blows from the upstream of the heating element to the downstream thereof under the action of the fan, the heating element operates, and the heating element releases the moisture adsorbed by the hygroscopic material in a concentrated manner. A large amount of moisture is released, and a large amount of hydrated negative ions are generated in the process of generating the material, the material is cracked, and a large amount of hydrated negative ions are generated. The hydrated negative ions are blown to the environment by the wind beam, and the air quality of the environment is improved. The air treatment device provided by the application does not require the user to manually add water and does not increase the humidity of the environment, and has better practicability.

[0149] In the description of the present application, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "edge", "opposite", "four corners", "periphery", "mouth structure" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the structure referred to has a particular orientation, is constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0150] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", "assembly" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; the terms "installation", "connection", "fixed connection" can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0151] Those skilled in the art can understand that all or some of the steps in the above disclosed method, the functional modules / units in the system and the device can be implemented as software, firmware, hardware and appropriate combinations thereof. In the hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be performed by several physical components in cooperation. Some components or all components can be implemented as software executed by a processor such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, as known to those skilled in the art, communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carriers or other transmission mechanisms, and can include any information delivery medium.

Claims

1. An air handling device, characterized in that, include: Moisture-absorbing material, designed to absorb moisture; A heating unit, wherein the moisture-absorbing material is disposed in the heating unit, and the heating unit is configured to release the moisture absorbed by the moisture-absorbing material; The generating material is placed in the heating unit and configured to split water molecules to generate hydrated negative ions; and A fan is configured to form an airflow from upstream to downstream of the heating unit; the heating unit includes: A first heating element, the first heating element having a first functional layer, the first functional layer being a moisture-absorbing layer, the moisture-absorbing layer comprising the moisture-absorbing material; and A second heating element is disposed downstream of the first heating element. The second heating element has a second functional layer, which is a generation layer, and the generation layer includes the generation material.

2. The air handling equipment according to claim 1, characterized in that, An adhesion strength enhancement layer is provided between the second heating element and the second functional layer to improve adhesion strength.

3. The air handling equipment according to claim 1, characterized in that, An adhesion strength enhancement layer is provided between the first heating element and the first functional layer to improve adhesion strength.

4. The air handling equipment according to claim 2 or 3, characterized in that, The adhesive strength enhancement layer comprises at least one of silica sol, alumina sol, boehmite, and bentonite.

5. The air handling equipment according to any one of claims 1 to 3, characterized in that, The second heating element includes at least one of a thermistor and a graphene heating film.

6. The air handling equipment according to any one of claims 1 to 3, characterized in that, The first heating element includes a honeycomb-structured thermistor; A temperature detection unit is provided downstream of the first heating element.

7. The air handling apparatus according to any one of claims 1 to 3, characterized in that, The moisture-absorbing material includes at least one of molecular sieves, activated alumina, silica gel, and metal-organic frameworks; The components of the generated material include at least one of tourmaline and negative ion powder; The fan is located upstream or downstream of the heating unit.

8. The air handling apparatus according to any one of claims 1 to 3, characterized in that, Also includes: A humidity detection unit is configured to detect the humidity of the air upstream of the moisture-absorbing material and the humidity of the air downstream of the moisture-absorbing material; and The control unit, the humidity detection unit, the fan and the heating unit are all electrically connected to the control unit.

9. A control method for an air handling device as described in any one of claims 1 to 8, characterized in that, include: Moisture absorption process: Run the fan and turn off the heating unit; The process of generating hydrated negative ions involves operating the fan and the heating unit.

10. The control method according to claim 9, characterized in that, During the moisture absorption process, the fan operates at a first set speed. During the generation of hydrated negative ions, the operating speed of the fan is a second set speed, which is not greater than the first set speed.

11. The control method according to claim 10, characterized in that, The first set speed is A, and the second set speed is 0.05*A to 0.25*A.

12. The control method according to any one of claims 9 to 11, characterized in that, The control method further includes: during the moisture absorption process, based on the fan's operating time reaching a first set duration, either shutting down the fan or executing the process of generating hydrated negative ions; or The control method further includes: during the moisture absorption process, obtaining the air humidity upstream and downstream of the moisture-absorbing material, and based on the air humidity difference between the upstream and downstream of the moisture-absorbing material reaching a first set value, turning off the fan or executing the process of generating hydrated negative ions.

13. The control method according to any one of claims 9 to 11, characterized in that, The heating unit includes a first heating element, and a temperature detection unit is provided downstream of the first heating element. The control method further includes: during the generation of hydrated negative ions, obtaining the temperature downstream of the first heating element, and controlling the first heating element according to the temperature so that the temperature downstream of the first heating element is maintained at the set temperature for a second set time, and then turning off the first heating element or performing the moisture absorption process.

14. The control method according to claim 13, characterized in that, The heating unit further includes a second heating element, and the control method further includes: during the generation of hydrated negative ions, controlling the second heating element to heat at a set heating temperature, and turning off the second heating element when the first heating element is turned off.

15. The control method according to claim 14, characterized in that, The set temperature is 75°C to 150°C, and the set heating temperature is 60°C to 120°C.

16. The control method according to any one of claims 9 to 11, characterized in that, The heating unit includes a first heating element, and a temperature detection unit is provided downstream of the first heating element. The control method further includes: during the generation of hydrated negative ions, obtaining the temperature downstream of the first heating element, and controlling the first heating element according to the temperature so that the temperature downstream of the first heating element is maintained at the corresponding set temperature in stages, and then turning off the first heating element or performing the moisture absorption process.

17. The control method according to claim 16, characterized in that, In any two adjacent stages, the set temperature downstream of the first heating element in the later stage is greater than or equal to the set temperature downstream of the first heating element in the previous stage.

18. The control method according to claim 17, characterized in that, The temperature downstream of the first heating element is maintained at the corresponding set temperature in five stages; First stage: The set temperature downstream of the first heating element is 30°C to 40°C, and the duration is 2 min to 20 min; Second stage: The set temperature downstream of the first heating element is 40°C to 50°C, and the duration is 2 min to 20 min; Third stage: The set temperature downstream of the first heating element is 50°C to 60°C, and the duration is 2 min to 20 min; Fourth stage: The set temperature downstream of the first heating element is 60°C to 75°C, and the duration is 2 min to 20 min; Fifth stage: The set temperature downstream of the first heating element is 75°C to 150°C, and the duration is 2 min to 20 min.

19. The control method according to claim 16, characterized in that, The heating unit further includes a second heating element, and the control method further includes: controlling the second heating element to heat at a set heating temperature, and turning off the second heating element at the same time as turning off the first heating element.

20. The control method according to claim 19, characterized in that, The set heating temperature is 60°C to 120°C.

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