A method of sterilizing a range hood

Abstract

The application discloses a sterilization method of a range hood, comprising the following steps: S1, detecting the state of the range hood in real time; S11, recording the cumulative working time T1 of the range hood, and setting the threshold value of the cumulative working time of the range hood as T1max; S12, detecting the TVOC concentration value E in the smoke collection cavity in real time in the off state, and setting the threshold value of the TVOC concentration as Emax; when T1 >= T1max or E >= Emax, entering step S2, starting the sterilization program; and S3, ending the sterilization work. Compared with the prior art, the sterilization method of the range hood can maintain the ozone concentration at different concentrations in different stages in the whole sterilization process, and the ozone concentration maintained in a previous sterilization stage is greater than that in a subsequent sterilization stage, so that the ozone with a large concentration is used to quickly kill and sterilize when the oil fume concentration in the air collection cavity is relatively large, and the ozone concentration is reduced when the oil fume concentration in the air collection cavity is small, thereby reducing the overall ozone demand while ensuring the sterilization effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range hood, in particular, to a sterilization method of range hood. BACKGROUND

[0002] After long-term use, the oil-water mixture will accumulate in the range hood. The existing range hood can clean the oil-water mixture in the range hood, but it cannot be completely cleaned. Long-term accumulation of oil-water mixture will breed a large number of harmful bacteria, which will harm human health. The existing range hood uses ultraviolet rays for sterilization and disinfection, but the ultraviolet sterilization and disinfection has the following problems: 1. Ultraviolet sterilization and disinfection is easy to have sterilization dead angle, which leads to incomplete sterilization; 2. The ultraviolet lamp installed in the range hood is easy to be polluted and adsorbed by oil fume, which affects the light emitting effect of the ultraviolet lamp and thus affects the sterilization and disinfection effect; 3. When ultraviolet sterilization is used, the power of the ultraviolet lamp is relatively high, and the ultraviolet sterilization needs a long action time, which leads to high energy consumption during ultraviolet sterilization; 4. The humidity in the range hood is generally high, which directly reduces the effect of ultraviolet sterilization and disinfection. SUMMARY

[0003] The present application aims to provide a sterilization method of range hood, which solves the above technical problems.

[0004] A sterilization method of range hood, the range hood comprising a range hood body, a fan and an ozone generating unit, the range hood body having a wind collecting cavity, the wind collecting cavity having an open state and a closed state, the fan being arranged in the wind collecting cavity, the ozone generating unit being arranged in the range hood body, the ozone generating unit being selectively communicated with or isolated from the wind collecting cavity, the sterilization method further comprising a control module, the control module being used for controlling the state of the wind collecting cavity and the working state of the ozone generator, the sterilization method comprising the following steps:

[0005] S1: Real-time detection of the state of the range hood;

[0006] S11: Recording the cumulative working time T1 of the range hood, the threshold value of the cumulative working time of the range hood being set as T1max;

[0007] S12: Real-time detection of the TVOC concentration value E in the wind collecting cavity in the off state, the threshold value of the TVOC concentration being set as Emax;

[0008] When T1≥T1max or E≥Emax, the sterilization program is started in step S2:

[0009] S21: Detection of the state of the wind collecting cavity, so that the wind collecting cavity is in the closed state;

[0010] S22: Starting of the ozone generating unit, the ozone generating unit being communicated with the wind collecting cavity and delivering ozone into the wind collecting cavity;

[0011] S23: start the fan at low speed, the fan runs at low speed and stirs the ozone entering the air collecting cavity evenly;

[0012] S24: detect the ozone concentration in the air collecting cavity in real time, divide A into m time periods, and mark each time period as A1, A2,..., A n ... m , control the ozone generating unit to increase the ozone concentration in the air collecting cavity to C1 in the A1 time period, maintain the ozone concentration at C1 in the A2 time period, decrease the ozone concentration from C1 to C2 in the A3 time period, and so on, and maintain the ozone concentration at C n-1 ... n-1 ... m in the A n-1 time period, decrease the ozone concentration from C （n-1） / 2 to C n in the A （n-1） / 2 time period, maintain the ozone concentration at C （n+1） / 2 in the A n+1 time period, and so on. （n+1） / 2 , 30min≤A≤120min, 30mg / m 3 ≥C1≥C2≥...C n ... ≥C m / 2 ≥5mg / m 3 , 2≤n<m, m>3, and n is an odd number and m is an even number.

[0013] S25: turn off the ozone generating unit, and isolate the ozone generating unit from the air collecting cavity.

[0014] S26: turn off the fan.

[0015] S3: end the sterilization work.

[0016] According to an embodiment of the present application, step S1 further comprises:

[0017] S13: record the accumulated standby time T2 of the range hood, and set a threshold value T2max for the accumulated standby time of the range hood.

[0018] When 0

[0019] According to an embodiment of the present application, in step S13, when 0

[0020] If 0 < T1 < T1max and T2 ≥ T2_ and 0 < E < Emax / 2, then step S2 is performed sequentially according to steps S21, S22, S23, S27, S25 and S26.

[0021] S27: Real-time monitoring of ozone concentration in the air collection chamber; within the disinfection time F, controlling the ozone generating unit to increase the ozone concentration in the air collection chamber to C during the initial working time period F1. n And maintain ozone concentration at C for the remainder of the time. n ,30min≤F<A≤120min, 30mg / m 3 ≥C1≥C n ≥C m / 2 ≥5mg / m 3 .

[0022] According to one embodiment of the present invention, the volume of the air collection chamber is L, the target ozone concentration C, and the ozone half-life t at a specific temperature and humidity are stored in the control module; the method for controlling the ozone generating unit is as follows:

[0023] Detect the temperature T and humidity H inside the air collection chamber;

[0024] The control module queries the ozone half-life t based on temperature T and humidity H;

[0025] Based on the ozone half-life t and the ozone generating unit's operating time T i The amount of ozone produced inside S i Calculation time T i Internal ozone gas attenuation λ i :

[0026] λ i = ;

[0027] Then in A n+1 During the period, the ozone concentration remained at C （n+1） / 2 The amount of ozone that the ozone generating unit needs to produce is S: S = λ1 + λ2 + ... + λ a +...λ i = ,T1+T2+...T a +...+T i =A n+1 .

[0028] According to one embodiment of the present invention, before proceeding to step S2, step S0 is further included: self-cleaning of the range hood.

[0029] S01: Open the air collection chamber;

[0030] S02: Start the fan at the maximum air volume gear; the fan runs at the maximum air volume gear for T2 time.

[0031] According to an embodiment of the present application, the air collecting cavity has an air inlet and an air outlet; in step S01, opening the air collecting cavity comprises the following steps:

[0032] S011: Open the air inlet and detect the state of the air inlet;

[0033] S012: Open the air outlet and detect the state of the air outlet;

[0034] When the air inlet is in the open state and the air outlet is in the open state, the control module judges that the air collecting cavity is in the open state, and enters step S02.

[0035] According to an embodiment of the present application, if step S011 detects that the air inlet is in the closed state or / and step S012 detects that the air outlet is in the closed state, return to step S011 or / and step S012, wait for time T1, and then return to step S011 or / and step S012 again; if step S011 detects that the air inlet is still in the closed state or / and step S012 detects that the air outlet is still in the closed state, issue a warning, remind the user, and enter step S3.

[0036] According to an embodiment of the present application, the air collecting cavity has an air inlet and an air outlet; in step S21, detecting the state of the air collecting cavity to make the air collecting cavity in the closed state comprises the following steps:

[0037] S211: Close the air inlet and detect the state of the air inlet;

[0038] S212: Close the air outlet and detect the state of the air outlet;

[0039] When the air inlet is in the closed state and the air outlet is in the closed state, the control module judges that the air collecting cavity is in the closed state, and enters step S22.

[0040] According to an embodiment of the present application, if step S211 detects that the air inlet is in the open state or / and step S212 detects that the air outlet is in the open state, return to step S211 or / and step S212, wait for time T1, and then return to step S211 or / and step S212 again; if step S211 detects that the air inlet is still in the open state or / and step S212 detects that the air outlet is still in the open state, issue a warning, remind the user, and enter step S3.

[0041] According to an embodiment of the present application, if in step S24, after the time period A1 ends, the ozone concentration cannot be raised to C1 all the time, issue a warning, remind the user, and enter step S25.

[0042] Compared with the prior art, the disinfection method of the smoke hood of the present invention has the following advantages:

[0043] 1. The disinfection method of the smoke hood of the present invention involves closing the air inlet when disinfecting the air collection chamber of the smoke hood, so that the air collection chamber forms a relatively sealed space. The ozone generator control unit controls the ozone generator unit to generate ozone gas. The fan runs at low speed and disturbs the air to make the ozone evenly distributed in the air collection chamber. At the same time, the ozone sensor detection unit detects the ozone concentration in the air collection chamber in real time, so that the ozone concentration in the air collection chamber is maintained within a certain range and for a certain period of time, thereby achieving the effect of ozone disinfection and sterilization.

[0044] 2. The disinfection method of the smoke hood of the present invention generates a certain amount of ozone gas in the ozone generating unit in the sealed air collection chamber, allowing the ozone to diffuse fully in the air collection chamber. The oxidizing properties of ozone gas are used to kill bacteria, viruses and other microorganisms, and quickly decompose organic or inorganic substances that cause odors and other smells, thereby achieving a deodorization effect. There is no odor, no dead corners and the disinfection is comprehensive, overcoming the problem of disinfection dead corners that exist in ultraviolet disinfection.

[0045] 3. In the disinfection method of the smoke hood of the present invention, after the ozone in the air collection chamber disinfects the air collection chamber, the ozone decomposes into oxygen on its own after disinfection, leaving no harmful residues and causing no secondary pollution. Attached Figure Description

[0046] Figure 1 A schematic diagram of the structure of a range hood using the disinfection method of the present invention;

[0047] Figure 2 A cross-sectional view of a range hood employing the disinfection method of the present invention;

[0048] Figure 3 This is a partially enlarged view of the main body of the range hood using the disinfection method of the present invention when the connecting hole is closed (the housing of the ozone generating unit is hidden).

[0049] Figure 4 for Figure 3 Enlarged view of A in the middle;

[0050] Figure 5 This is a partially enlarged view of the main body of the range hood using the disinfection method of the present invention when the connecting hole is in the open state (the housing of the ozone generating unit is hidden).

[0051] Figure 6 for Figure 5 Enlarged view of B in the middle;

[0052] In the figure: 1. The main body of the smoke machine, 11. The front panel, 111. The air inlet, 12. The movable panel, 13. The electric check valve, 2. The fan, 3. The ozone generation unit, 31. The ozone generator, 32. The switch valve assembly, 321. The drive motor, 322. The drive board, 323. The switch valve plate, 33. The shell.

[0053] The implementation and advantages of the functions of the present application will be further described in conjunction with the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0054] In the following, a plurality of embodiments of the present application will be disclosed with reference to the drawings. For the purpose of clear illustration, a number of practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0055] It should be noted that all directional references, such as upper, lower, left, right, front, rear, etc., used herein are in connection with the orientation of the components as shown in the drawings and are for the purpose of illustration only. If the relative orientation of the components is changed, the directional references should be changed accordingly.

[0056] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and is not particularly intended to indicate the order or sequence, nor is it intended to limit the present application. It is merely for the purpose of distinguishing between components or operations described by the same technical terms. It should not be understood as indicating or implying that the relative importance of the indicated technical features or the number of technical features is greater. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0057] In order to further understand the content, characteristics and effects of the present application, the following embodiments are exemplified and described in detail as follows in conjunction with the drawings:

[0058] The present application discloses a disinfection method of a smoke machine. The disinfection method of the smoke machine disclosed in the present application is used for a smoke machine. Please refer to Figures 1 to 4The fume hood includes a main body 1, a fan 2, and an ozone generating unit 3. The main body 1 has an air collection chamber with open and closed states. The fan 2 is located inside the air collection chamber. The ozone generating unit 3 is located inside the main body 1 and is selectively connected to or isolated from the air collection chamber. The fume hood also includes a control module for controlling the state of the air collection chamber and the operating state of the ozone generating unit 3. The disinfection method includes the following steps:

[0059] S1: Real-time monitoring of the range hood's status;

[0060] S11: Record the cumulative working time T1 of the range hood. The threshold for the cumulative working time of the range hood is set to T1max.

[0061] S12: Real-time detection of TVOC concentration value E in the smoke collection chamber when the machine is off; the TVOC concentration threshold is set to Emax.

[0062] When T1≥T1max, or E≥Emax, proceed to step S2: Initiate the disinfection procedure.

[0063] S21: Detect the status of the air collection chamber and keep the air collection chamber in the closed state;

[0064] S22: Start ozone generating unit 3. Ozone generating unit 3 is connected to the air collection chamber and delivers ozone into the air collection chamber.

[0065] S23: Start fan 2 at low speed. Fan 2 runs at low speed and stirs the ozone entering the air collection chamber evenly.

[0066] S24: Real-time monitoring of ozone concentration in the air collection chamber. Within the disinfection time A, A is divided into m time periods, each time period being denoted as A1, A2...A... n ...A m In A1, A3...A n-1 ...A n-1 ...A m Inside, the ozone generating unit 3 is controlled to raise the ozone concentration in the air collection chamber to C1 during the initial working time period A1, and maintain the ozone concentration at C1 during the time period A2. During the time period A3, the ozone concentration decreases from C1 to C2, and so on. n-1 During the period, the ozone concentration remained at C （n-1） / 2 In A n During the time period, the ozone concentration decreased from C （n-1） / 2 Reduced to C （n+1） / 2 In A n+1 During the period, the ozone concentration remained at C （n+1） / 2 ,30min≤A≤120min,30mg / m 3 ≥C1≥C2≥...Cn ...≥C m / 2 ≥5mg / m 3 , 2≤n

[0067] S25: closing the ozone generating unit 3, the ozone generating unit 3 is isolated from the air collecting cavity;

[0068] S26: closing the fan 2;

[0069] S3: ending the sterilization work.

[0070] The sterilization method of the smoke machine of the application has two conditions for starting ozone sterilization, that is, the cumulative working time T1 of the smoke machine reaches the set threshold T1max, or the TVOC concentration value E reaches the set threshold Emax; after the smoke machine reaches the sterilization condition, the state of the air collecting cavity is checked, if the air collecting cavity is in the closed state, the ozone generating unit 3 is communicated with the air collecting cavity and transports ozone into the air collecting cavity, since the density of ozone is greater than that of air, the fan 2 of the smoke machine runs at low speed and stirs the ozone entering the air collecting cavity uniformly, avoiding the ozone generated by the ozone generating unit 3 from easily depositing at the bottom of the air collecting cavity, and the sterilization process of ozone is divided into m stages, in the first stage A1, the ozone generating unit 3 rapidly increases the concentration of ozone in the air collecting cavity to C1, then in the second time period A2, the ozone generating unit 3 continues to release ozone and maintains the ozone concentration at C1, since ozone has a half-life period, in the second time period A2, the ozone generating unit 3 releases ozone to supplement the attenuation of ozone, so that the concentration of ozone is maintained at C1 in the second time period A2, the sterilization stage is started, the oil fume concentration in the air collecting cavity is relatively high, and high-concentration ozone is needed for sterilization, with the extension of the sterilization time, the oil fume concentration in the air collecting cavity gradually decreases, so the ozone concentration is the highest in the second time period A2, after the end of the A2 time period, the ozone generating unit 3 stops generating ozone, in the A3 time period, the ozone decays and the concentration begins to decrease, in this process, the ozone continues to sterilize the inside of the air collecting cavity, after the end of the A3 time period, the ozone concentration decreases to C2, in the A4 time period, the ozone generating unit 3 is started, the ozone generating unit 3 releases ozone to supplement the attenuation of ozone, so that the concentration of ozone is maintained at C2 in the fourth time period A4; by analogy, in the A n-1 time period, the ozone generating unit 3 is started and releases ozone to supplement the attenuation of ozone, so that the concentration of ozone is maintained at C （n-1） / 2 in the A n time period, the ozone generating unit 3 stops generating ozone, the ozone decays, and the concentration decreases from C （n-1） / 2 to C （n+1） / 2 , in the A n+1 time period, the ozone generating unit 3 is started and releases ozone to supplement the attenuation of ozone, so that the concentration of ozone is maintained at C（n+1） / 2 In A m After the time period ends, ozone generator unit 3 is turned off, and ozone generator unit 3 is isolated from the air collection chamber; then fan 2 is turned off. Since ozone generator unit 3 no longer releases ozone, the ozone in the air collection chamber will completely decay over time. When the user turns on the range hood next time, the ozone in the air collection chamber will have completely decomposed, and no ozone will leak into the kitchen space.

[0071] The disinfection method of the range hood of the present invention maintains the ozone concentration at different stages throughout the disinfection process. In the previous disinfection stage, the ozone concentration is maintained at a higher level than that in the subsequent disinfection stage. When the oil fume concentration in the air collection chamber is relatively high, a high concentration of ozone is used for rapid disinfection. When the oil fume concentration in the air collection chamber decreases, the ozone concentration is reduced. This reduces the overall ozone requirement while ensuring the disinfection effect.

[0072] The ozone disinfection method of the present invention, in A n When n is an odd number of time intervals, A n The length is determined by A n-1 and A n+1 The ozone concentration difference determines, in other words, in A n During the time period, the ozone concentration decreased from C （n-1） / 2 Reduce to C （n+1） / 2 The rate of decline is determined by the rate of ozone decay; the concentration difference between the two is the rate of decrease in ozone concentration at A. n The amount of ozone that needs to decay over a given time period, assuming the ozone half-life is readily known, A n The length of the ozone layer is determined by the amount of ozone that needs to be attenuated.

[0073] In the disinfection method of the range hood of the present invention, the ozone generating unit 3 is selectively connected to or isolated from the air collection chamber. When the range hood is in the smoke extraction mode, the air collection chamber of the range hood body 1 is open, the fan 2 is running, and the cooking fumes enter the air collection chamber and are discharged by the exhaust fan. During the process of the fumes entering the air collection chamber, the ozone generating unit 3 is isolated from the air collection chamber, and the fumes in the air collection chamber will not pollute the ozone generating unit 3, nor will they affect the ozone release of the ozone generating unit 3. When it is necessary to disinfect the air collection chamber, the ozone generating unit 3 is connected to the air collection chamber and supplies ozone gas into the air collection chamber. By running the fan 2 at a low speed and disturbing the air, the ozone is evenly distributed in the air collection chamber. The ozone generating unit 3 maintains the ozone concentration in the air collection chamber within a certain range and for a certain period of time, thereby achieving the effect of ozone disinfection and sterilization.

[0074] The disinfection method of the range hood of the present application, in order to realize the selective communication or isolation of the ozone generating unit 3 with the air collecting cavity, the ozone generating unit 3 comprises an ozone generator 31, a switch valve assembly 32 and a shell 33, the top of the range hood body 1 is provided with a communication hole in communication with the air collecting cavity, the switch valve assembly 32 is used for opening or closing the communication hole, the shell 33 is arranged on the top of the range hood body 1 and covers the ozone generator 31 and the switch valve assembly 32, when the switch valve assembly 32 opens the communication hole, the inside of the shell 33 is in communication with the air collecting cavity. When the range hood is in the smoke extraction mode, the switch valve assembly 32 closes the communication hole at the top of the range hood body 1, so that the inside of the shell 33 is isolated from the air collecting cavity, when the fan 2 operates and the oil fume passes through the air collecting cavity, the oil fume cannot enter the shell 33 through the communication hole, and the ozone generator 31 will not be polluted by the oil fume; when it is needed to disinfect the air collecting cavity, the switch valve assembly 32 opens the communication hole at the top of the range hood body 1, the inside of the shell 33 is in communication with the air collecting cavity, the ozone generator 31 is started and generates ozone, the ozone enters the air collecting cavity through the communication hole and is uniformly distributed in the air collecting cavity under the action of the fan 2, after the ozone in the air collecting cavity reaches a certain concentration and maintains for a period of time, the ozone generator 31 stops generating ozone, and the switch valve assembly 32 closes the communication hole again.

[0075] The disinfection method of the range hood of the present application, when the switch valve assembly 32 opens the communication hole, the projection of the emitting end of the ozone generator 31 falls in the communication hole, and the extension line of the extension direction of the emitting end of the ozone generator 31 passes through the communication hole. Since the density of ozone is greater than the density of air, when the ozone is emitted from the emitting end of the ozone generator 31, the ozone begins to sink. By making the projection of the emitting end of the ozone generator 31 fall in the communication hole and making the extension line of the extension direction of the emitting end of the ozone generator 31 pass through the communication hole, when the ozone is emitted from the emitting end of the ozone generator 31, more ozone can directly enter the air collecting cavity through the communication hole, and the ozone concentration in the air collecting cavity can quickly reach the required concentration.

[0076] The disinfection method of the range hood of the present application, the switch valve assembly 32 comprises a driving motor 321, a driving plate 322 and a switch valve plate 323, the driving plate 322 has a first connection site connected with the output end of the driving motor 321 and a second connection site connected with the switch valve plate 323, the driving motor 321 drives the driving plate 322 to rotate, so that the driving plate 322 drives the switch valve plate 323 to rotate and opens the communication hole. When the range hood enters the disinfection mode, the air collecting cavity is closed, the driving motor 321 is started, the output shaft of the driving motor 321 drives the driving plate 322 to rotate, the driving plate 322 rotates and drives the switch valve plate 323 to rotate, the switch valve plate 323 opens the communication hole, and the ozone generated by the ozone generator 31 can enter the air collecting cavity through the communication hole.

[0077] The switch valve plate 323 is located on the top of the smoke machine body 1 and in the shell 33. When the smoke machine is in the running mode, both ends of the switch valve plate 323 are located at the lowest position, and the switch valve plate 323 is close to the top of the smoke machine body 1 and seals the communication hole. When the driving motor 321 drives the driving plate 322 to drive the switch valve plate 323 to rotate, the switch valve plate 323 starts to rotate upwards, and at the same time, the switch valve plate 323 rises relative to the top of the smoke machine body 1, so that the communication hole is opened, and the ozone generated by the ozone generator 31 can enter the air collecting cavity through the communication hole.

[0078] In the disinfection method of the smoke machine, the length of the line connecting the midpoint of the edge of one end of the switch valve plate close to the second connecting position and the midpoint of the first connecting position is L1, the length of the line connecting the midpoint of the edge of one end of the switch valve plate away from the second connecting position and the midpoint of the first connecting position is L2, L1

[0079] Please refer to Figures 3 to 6 In the disinfection method of the smoke machine, the ozone generator 31 is arranged on the upper surface of the switch valve plate 323, and the emission end of the ozone generator 31 extends to the edge of one end of the switch valve plate close to the second connecting position. When the driving motor 321 drives the driving plate 322 to drive the switch valve plate 323 to rotate, the distance that the one end of the switch valve plate 323 close to the second connecting position moves upwards is less than the distance that the one end of the switch valve plate 323 away from the second connecting position moves upwards, and at the same time, the switch valve plate 323 changes from horizontal arrangement to inclined arrangement, and the one end of the switch valve plate 323 close to the second connecting position is located below. When the communication hole is opened, the ozone generator 31 produces ozone, which directly enters the air collecting cavity through the communication hole.

[0080] In the disinfection method of the smoke machine, step S1 further comprises:

[0081] S13: record the cumulative standby time T2 of the smoke machine, and the threshold value of the cumulative standby time of the smoke machine is T2max.

[0082] When 0

[0083] Different families, cooking mode and cooking habits are different, for cooking more frequent users, can be recorded through the cumulative working time T1 of the smoke machine or / and in the off state Real-time detection of TVOC concentration value E in the smoke collection cavity, as long as the cumulative working time T1 of the smoke machine reaches the set threshold T1max or the TVOC concentration E reaches the set threshold Emax, the disinfection program can be started; But a part of the user, the daily cooking time is less, the cumulative working time T1 of the smoke machine reaches the set threshold T1max or the TVOC concentration E reaches the set threshold Emax, it takes a long time to reach, but if the long-term disinfection of the air collection cavity, the oil fume deposited for a long time in the air collection cavity still produces bacteria, therefore, for the user who cooks less frequently, record the cumulative standby time T2 of the smoke machine, when the cumulative standby time T2 of the smoke machine reaches the set threshold T2max, the smoke machine also starts the disinfection program and disinfects the air collection cavity.

[0084] The disinfection method of the smoke machine of the application, in step S13, if 0

[0085] If 0

[0086] S27: Real-time detection of ozone concentration in the air collection cavity, within the disinfection time F, control the ozone generating unit 3, make the ozone generating unit 3 in the F1 time period of starting work, the ozone concentration in the air collection cavity is increased to C n , and the ozone concentration is maintained at C n , 30min≤F 3 ≤A≤120min, 30mg / m n ≥C1≥C m / 2 ≥C 3 ≥5mg / m 3 .

[0087] That is, for the user who cooks more frequently, the cumulative working time T1 of the range hood or / and the TVOC concentration value E in the smoke collection cavity in the off state is detected in real time, and as long as the cumulative working time T1 of the range hood reaches the set threshold T1max or the TVOC concentration E reaches the set threshold Emax, the sterilization program is started, and during the whole sterilization process, the ozone concentration is maintained at different concentrations in different stages, and in the previous sterilization stage, the ozone concentration is greater than that in the subsequent sterilization stage, when the oil smoke concentration in the air collection cavity is relatively large, the ozone concentration is high, and when the oil smoke concentration in the air collection cavity is small, the ozone concentration is reduced, the ozone demand is reduced while the sterilization effect is ensured; when the range hood starts the sterilization program due to the cumulative standby time T2 of the range hood reaching the set threshold T2max, the oil smoke accumulated in the air collection cavity is less than that in the other two cases, so the sterilization time does not need to be as long as that required when the sterilization program is started in the other two cases, and during the sterilization process, the ozone generation unit 3 is controlled to make the ozone concentration first increase to C n , and then maintain the ozone concentration at C n unchanged in the remaining time, so as to sterilize the smoke collection cavity. n C1, and in order to ensure the sterilization effect in the air collection cavity, n is a small time period in the first 1 / 2 time period, C n is a concentration value of the time period, for example, when m is equal to 6, C n may be C3.

[0088] The sterilization method of the range hood of the application stores the volume of the air collection cavity as L, the target concentration C of ozone and the half-life period t of ozone under a specific temperature and humidity in the control module; the method for controlling the ozone generation unit 3 is as follows:

[0089] detecting the temperature T and humidity H in the air collection cavity;

[0090] the control module queries the half-life period t of ozone according to the temperature T and humidity H;

[0091] according to the half-life period t of ozone, the ozone amount S i generated by the ozone generation unit 3 in the time T i , calculating the ozone decay amount λ i in the time T i :

[0092] λ i = ;

[0093] then in the time period A n+1 , the ozone concentration is maintained at C （n+1） / 2The amount of ozone that ozone generating unit 3 needs to produce is S: S = λ1 + λ2 + ... + λ a +...λ i = T1+T2+...T a +...+T i =A n+1 .

[0094] Because the rate of ozone decay is not uniform, the amount of ozone decay varies at different times. Therefore, for each time period A that maintains a stable ozone concentration... n+1 Within this time period, divide the time period into i time periods, each of which is T1, T2...T a ...T i T1+T2+...T a +...+T i =A n+1 At temperature T and humidity H, the control module queries the ozone half-life t, and calculates the ozone amount S1 generated within the running time T1 of ozone generating unit 3 based on the ozone half-life t and the ozone amount S1 generated within the running time T1 of ozone generating unit 3.

[0095] Ozone gas decay amounts λ1, λ2 within time T1 ;

[0096] Ozone gas decay amount λ2 within time T2, λ2= ; ...

[0097] Time T a Internal ozone gas attenuation λ a , λ a = ; ...

[0098] Time T i Internal ozone gas attenuation λ i , λ i = ;

[0099] In A n+1 During the period, the ozone concentration remained at C （n+1） / 2 The required amount of ozone is L*C （n+1） / 2 ;

[0100] The total amount of ozone decayed is: λ1 + λ2 + ... + λ a +...λ i ;

[0101] Therefore, in A n+1 During the period, the ozone concentration remained at C n, the amount of ozone required by the ozone generating unit 3 is S: S = λ1 + λ2 +... λ a +...λ i = ,T1+T2+...T a +...+T i =A n+1 .

[0102] The disinfection method of the smoke machine of the present application further comprises a step S0 before the entering step S2: the smoke machine self-cleaning:

[0103] S01: opening the air collecting cavity;

[0104] S02: starting the fan 2 at the maximum air volume gear; the fan 2 runs at the maximum air volume gear for T2 time.

[0105] The fan 2 of the oil fume exhaust hood runs for a long time, and the volute and the fan wheel of the fan 2 are the places where the most oil dirt adheres, and the fan 2 is difficult to be cleaned when the user cleans the smoke machine, so that when the fan 2 is started at the maximum air volume gear before disinfection, the fan wheel of the fan 2 runs fast, and the centrifugal force and the large air volume generated are used to quickly throw out the oil on the fan wheel and the volute, so that the inside of the air collecting cavity can be preliminarily dry cleaned; when the ozone disinfection is carried out subsequently, the total demand of ozone can be reduced, the ozone disinfection time can be shortened, and the use of the user can be avoided.

[0106] The disinfection method of the smoke machine of the present application, the air collecting cavity has an air inlet and an air outlet; in step S01, opening the air collecting cavity comprises the following steps:

[0107] S011: opening the air inlet and detecting the state of the air inlet;

[0108] S012: opening the air outlet and detecting the state of the air outlet;

[0109] When the air inlet is in the open state and the air outlet is in the open state, the control module judges that the air collecting cavity is in the open state, and enters step S02.

[0110] Please refer to Figure 2In the illustrated embodiment, the user side of the range hood body 1 has a front panel 11 and a movable panel 12. The front panel 11 is provided with an air inlet 111 that connects to the air collection chamber. The movable panel 12 can move relative to the front panel 11 to open or close the air inlet 111. The top of the range hood body 1 is provided with an air outlet, and an electric check valve 13 is provided at the air outlet. The electric check valve 13 is used to open or close the air outlet. When the range hood needs to perform self-cleaning, the movable panel 12 moves relative to the front panel 11 and opens the air inlet 111. The electric check valve 13 opens the air outlet, and the air collection chamber is connected to the external airflow through the air inlet 11 and the air outlet. The fan 2 runs, and the external air enters the air collection chamber through the air inlet 111 and is then discharged through the air outlet. Before performing self-cleaning, the status of the air inlet 111 and the air outlet is checked to ensure that the airflow in the air collection chamber is connected, so that the fan 2 can start at the maximum airflow level and throw off the oil stains on the volute and impeller.

[0111] The movable panel 12 can move up and down relative to the front panel 11. When the range hood enters the operating mode, the movable panel 12 slides down along the front panel 11 and closes the air inlet 111. When the range hood enters the disinfection mode, the movable panel 12 slides up along the front panel 11 and closes the air inlet 111. When the range hood is in the normal off state, the movable panel 12 is also in the state of closing the air inlet 111, which can prevent backflow of oil fumes.

[0112] The movable panel 11 can rotate relative to the front panel 12. When the range hood is in the normal off state, the movable panel 11 and the front panel 12 are on the same plane and the air inlet 111 is closed. When it is necessary to open the air inlet 111, the movable panel 12 rotates relative to the front panel 11, and the gap formed between the movable panel 12 and the front panel 11 forms the air inlet 111.

[0113] exist Figure 2 In the illustrated embodiment, the lower end of the movable panel 12 is rotatably connected to the lower end of the range hood body 1. When the air inlet 111 needs to be opened, the movable panel 12 is subjected to an inward rotational force, and the upper end of the movable panel 12 flips towards the inside of the range hood body 1. The movable panel 12 enters the air collection chamber through the air inlet 111 on the front panel 11, thus opening the air inlet 111. When the air inlet 111 needs to be closed, the movable panel 12 is subjected to an outward rotational force, and the upper end of the movable panel 12 flips towards the outside of the range hood body 1. The movable panel 12 moves out of the air collection chamber through the air inlet 111 on the front panel 11. Finally, the movable panel 12 and the front panel 11 are located in the same plane, thus closing the air inlet 111.

[0114] The technology used to switch the air outlet of the electric check valve 13 adopts existing technology, which will not be elaborated here for the sake of brevity.

[0115] The sterilization method of the range hood of the application, if the step S011 detects that the air inlet is in the closed state or / and the step S012 detects that the air outlet is in the closed state, returns to the step S011 or / and the step S012, waits for a time T1, and then returns to the step S011 or / and the step S012 again. If the step S011 detects that the air inlet is still in the closed state or / and the step S012 detects that the air outlet is still in the closed state, an early warning is issued to remind the user, and the step S3 is entered.

[0116] Before the range hood enters the sterilization program, the range hood needs to be self-cleaned. The fan 2 starts the maximum air volume gear to throw off the oil stains on the volute and the wind wheel. When the fan 2 starts the maximum air volume gear, the air collecting cavity needs to be in the open state. At this time, the air inlet 111 and the air outlet of the range hood main body 1 need to be both in the open state. If any one of the air inlet 111 and the air outlet is in the closed state, the air pressure in the air collecting cavity cannot be balanced when the fan 2 operates. If the air inlet 111 is in the closed state and the fan 2 starts, the airflow in the exhaust duct will flow back into the air collecting cavity. Therefore, if the step S011 detects that the air inlet is in the closed state or / and the step S012 detects that the air outlet is in the closed state, the range hood will not be self-cleaned, and a waiting time T1 is waited. During the waiting process, the main control system will start the program of opening the air inlet 111 and the air outlet again, so that the movable panel 12 moves relative to the front panel 11 and opens the air inlet 111, and the electric check valve 13 opens the air outlet. After the waiting time T1, the step S011 or / and the step S012 is returned again. If the step S011 detects that the air inlet is still in the closed state or / and the step S012 detects that the air outlet is still in the closed state, an early warning is issued to remind the user, and the step S3 is entered to end the sterilization work. If the step S011 or / and the step S012 is returned and the step S011 detects that the air inlet is in the open state and the step S012 detects that the air outlet is in the open state at the same time, the step S02 is entered: the fan 2 starts the maximum air volume gear; the fan 2 operates at the maximum air volume gear for a time T2.

[0117] The sterilization method of the range hood of the application, the air collecting cavity has an air inlet and an air outlet; in the step S21, the state of the air collecting cavity is detected to make the air collecting cavity in the closed state, which includes the following steps:

[0118] S211: the air inlet is closed, and the state of the air inlet is detected;

[0119] S212: the air outlet is closed, and the state of the air outlet is detected;

[0120] When the air inlet is in the closed state and the air outlet is in the closed state, the control module judges that the air collecting cavity is in the closed state, and the step S22 is entered.

[0121] Before entering the sterilization program, the smoke machine first completes self-cleaning, and the air inlet 111 and the air outlet of the smoke machine are in an open state. Before the sterilization program, the air collecting cavity needs to be closed, so that the ozone generating unit 3 releases ozone in a closed space. When the air collecting cavity is closed, the movable panel 12 moves relative to the front panel 11 and closes the air inlet 111, the electric check valve 13 closes the air outlet, the air collecting cavity is in a closed state, the ozone generating unit 3 is in a state of communication with the air collecting cavity and starts to transport ozone into the air collecting cavity, and the fan 2 runs at a low speed. The fan 2 runs at a low speed, disturbs the air, so that the ozone is uniformly distributed in the air collecting cavity, the ozone generating unit 3 maintains the ozone concentration in the air collecting cavity in a certain range, and maintains for a certain time, so as to achieve the effect of ozone sterilization and disinfection.

[0122] The sterilization method of the smoke machine of the present application, if the air inlet is detected to be in an open state in step S211 or / and the air outlet is detected to be in an open state in step S212, returns to step S211 or / and step S212, waits for a time T1, and then returns to step S211 or / and step S212 again. If the air inlet is still detected to be in an open state in step S211 or / and the air outlet is still detected to be in an open state in step S212, a pre-warning is issued to remind the user, and step S3 is entered. Since ozone has a stimulating effect on the respiratory mucosa of the human body, when the ozone concentration in the air reaches 0.15 ppm, it can be smelled; according to international standards, when it reaches 0.5-1 ppm, it can cause dry mouth and other discomfort; when it reaches 1-4 ppm, it can cause coughing; and when it reaches 4-10 ppm, it can cause strong coughing. Therefore, when the smoke machine performs ozone sterilization, the air collecting cavity needs to be closed, and when either the air inlet or the air outlet is in an open state, the smoke machine will not perform sterilization work. The main control system of the smoke machine will start the program to close the air inlet 111 and the air outlet again, so that the movable panel 12 moves relative to the front panel 11 and closes the air inlet 111, and the electric check valve 13 closes the air outlet. After waiting for a time T1, step S211 or / and step S212 is returned again. If the air inlet is still detected to be in an open state in step S211 or / and the air outlet is still detected to be in an open state in step S212, a pre-warning is issued to remind the user, and step S3 is entered to end the sterilization work. If step S211 or / and step S212 is returned, and the air inlet is detected to be in a closed state in step S211 and the air outlet is detected to be in a closed state in step S212, step S22 is entered: the ozone generating unit 3 is started, the ozone generating unit 3 is in communication with the air collecting cavity and transports ozone into the air collecting cavity.

[0123] If the ozone concentration cannot be increased to C1 after the time period A1 ends in step S24, a pre-warning is issued to remind the user, and step S25 is entered. If the ozone concentration cannot be increased to C1, the ozone generation unit 3 may be malfunctioning, and in this case, the range hood issues a pre-warning to remind the user to maintain the ozone generation unit 3 and to shut down the ozone generation unit 3.

[0124] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement or improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of sterilizing a range hood, the method comprising: The smoke machine comprises a smoke machine body (1), a fan (2) and an ozone generating unit (3), the smoke machine body (1) has a wind collecting cavity, the wind collecting cavity has an open state and a closed state, the fan (2) is arranged in the wind collecting cavity, the ozone generating unit (3) is arranged in the smoke machine body (1), the ozone generating unit (3) is selectively communicated with or isolated from the wind collecting cavity, and the smoke machine further comprises a control module, the control module is used for controlling the state of the wind collecting cavity and the working state of the ozone generating unit (3), and the disinfection method comprises the following steps: S1: Real-time detection of the state of the smoke machine; S11: Recording the cumulative working time T1 of the smoke machine, and the threshold value of the cumulative working time of the smoke machine is T1max; S12: Real-time detection of the TVOC concentration value E in the wind collecting cavity in the off state, and the threshold value of the TVOC concentration is Emax; When T1≥T1max or E≥Emax, step S2 is entered: starting the disinfection program: S21: Detecting the state of the wind collecting cavity to make the wind collecting cavity in the closed state; S22: Starting the ozone generating unit (3), the ozone generating unit (3) is communicated with the wind collecting cavity and transports ozone into the wind collecting cavity; S23: Starting the fan (2) at a low speed, the fan (2) runs at a low speed and stirs the ozone entering the wind collecting cavity uniformly; S24: Real-time detection of ozone concentration in the air collection chamber; within the disinfection time A, A is divided into m time periods, each time period being denoted as A1, A2...A... n ...A m In A1, A3...A n-1 ...A n+1 ...A m-1 Inside, the ozone generating unit (3) is controlled to raise the ozone concentration in the air collection chamber to C1 during the A1 time period when it starts working, and maintain the ozone concentration at C1 during the A2 time period. During the A3 time period, the ozone concentration decreases from C1 to C2, and so on. n-1 During the period, the ozone concentration remained at C （n-1） / 2 In A n During the time period, the ozone concentration decreased from C （n-1） / 2 Reduce to C （n+1） / 2 In A n+1 During the period, the ozone concentration remained at C （n+1） / 2 ,30min≤A≤120min,30mg / m 3 ≥C1≥C2≥...C n ...≥C m / 2 ≥5mg / m 3 2≤n<m, m>3, and n is odd and m is even; S25: Turning off the ozone generating unit (3), the ozone generating unit (3) is isolated from the wind collecting cavity; S26: Turning off the fan (2); S3: Ending the disinfection work.

2. The sterilizing method of a range hood according to claim 1, wherein Step S1 further comprises: S13: Recording the cumulative standby time T2 of the smoke machine, and the threshold value of the cumulative standby time of the smoke machine is T2max; When 0 3. The sterilization method of a range hood according to claim 2, wherein In step S13, if 0 If 0 S27: Real-time detection of ozone concentration in the air collection chamber; within the disinfection time F, control the ozone generating unit (3) to increase the ozone concentration in the air collection chamber to C during the F1 time period after the start of operation. n And maintain ozone concentration at C for the remainder of the time. n ,30min≤F<A≤120min, 30mg / m 3 ≥C1≥C n ≥C m / 2 ≥5mg / m 3 .

4. The sterilizing method of a range hood according to claim 1 or 3, characterized by, The volume of the wind collecting cavity, the target concentration C of ozone and the half-life period t of ozone under specific temperature and humidity are stored in the control module; and the method for controlling the ozone generating unit (3) is: Detecting the temperature T and the humidity H in the wind collecting cavity; The control module queries the half-life period t of ozone according to the temperature T and the humidity H; According to the half-life period t of the ozone, the time T during which the ozone generation unit (3) is operated i The amount S of ozone generated inside i , the time T i The amount of ozone gas decay λ inside i : λ i = ; then in A n+1 for a time period, the ozone concentration is maintained at C （n+1） / 2 , the amount of ozone that the ozone generating unit (3) needs to generate is S: S = λ1 + λ2 +... λ a +... λ i = , T1 + T2 +... T a +... + T i = A n+1 .

5. The sterilizing method of a range hood according to claim 1, wherein Before entering step S2, step S0: self-cleaning of the smoke machine is further included: S01: Opening the wind collecting cavity; S02: Starting the fan (2) at the maximum air volume gear, and the fan (2) runs at the maximum air volume gear for T2 time.

6. The sterilization method of a range hood according to claim 5, wherein The wind collecting cavity has an air inlet and an air outlet; in step S01, opening the wind collecting cavity comprises the following steps: S011: Opening the air inlet and detecting the state of the air inlet; S012: Opening the air outlet and detecting the state of the air outlet; When the air inlet is in the open state and the air outlet is in the open state, the control module judges that the air collecting cavity is in the open state, and the process goes to step S02.

7. The sterilization method of a range hood according to claim 6, wherein If the air inlet is detected to be in the closed state in step S011 or / and the air outlet is detected to be in the closed state in step S012, the process returns to step S011 or / and step S012, and after waiting for a time T1, the process returns to step S011 or / and step S012 again. If the air inlet is still detected to be in the closed state in step S011 or / and the air outlet is still detected to be in the closed state in step S012, a pre-warning is sent to remind the user, and the process goes to step S3.

8. The sterilizing method of a range hood according to claim 5, wherein The air collecting cavity has an air inlet and an air outlet. In step S21, the state of the air collecting cavity is detected so that the air collecting cavity is in the closed state, including the following steps: S211: closing the air inlet and detecting the state of the air inlet; S212: closing the air outlet and detecting the state of the air outlet; When the air inlet is in the closed state and the air outlet is in the closed state, the control module judges that the air collecting cavity is in the closed state, and the process goes to step S22.

9. The sterilization method of a range hood according to claim 8, wherein If the air inlet is detected to be in the open state in step S211 or / and the air outlet is detected to be in the open state in step S212, the process returns to step S211 or / and step S212, and after waiting for a time T1, the process returns to step S211 or / and step S212 again. If the air inlet is still detected to be in the open state in step S211 or / and the air outlet is still detected to be in the open state in step S212, a pre-warning is sent to remind the user, and the process goes to step S3.

10. The sterilizing method of a range hood according to claim 1, wherein If in step S24, the ozone concentration cannot be increased to C1 after the time period A1 ends, a pre-warning is sent to remind the user, and the process goes to step S25.

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