A fan system for an air conditioner and oil fume integrated machine and its control method

Abstract

The present invention provides a fan control system based on the amount of oil fume and its working method. In the daily use process of the air conditioner and oil fume integrated machine, the working environment is not always in an environment with a large amount of oil fume. When the amount of oil fume is large, it is necessary for the oil fume to fully pass through the filter layer to adsorb large and small molecules in the oil fume. When the amount of oil fume is small, it is still necessary to turn on the air conditioner and oil fume integrated machine to achieve the cooling cycle of the indoor air. At this time, the filter material will block the airflow drawn by the fan, resulting in a reduction in the circulation efficiency. Therefore, a fan control system based on the amount of oil fume and its working method are proposed. A sensor is set in the oil fume channel of the device to detect the molecular weight in the oil fume. When it is judged that the amount of oil fume is less than the threshold value, the fan speed is increased to suck up the lighter filter material from the mounting rack and keep it in a suspended state, so that the air can pass through the oil fume channel more smoothly, improving the indoor air circulation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment control, and particularly relates to a fan system of an air conditioner and oil fume integrated machine and a control method thereof. Background Art

[0002] In the back kitchen of the catering service industry, an air conditioner and an oil fume extractor usually need to be installed to reduce the influence of high temperature and oil fume generated by multiple stoves. However, the oil fume discharged from the catering service industry belongs to a composite organic waste gas with a large air volume, a low concentration, oily sticky particles, and a high water vapor content. On the one hand, the oil stain is extremely easy to adhere to the air conditioner, resulting in a decrease in the refrigeration effect. On the other hand, the oil fume extractor will carry away cold air during the process of discharging the oil fume through the pipeline, increasing the energy consumption of the air conditioner.

[0003] Therefore, an air conditioner and oil fume integrated machine based on the condensation principle appears. By condensing the air, while removing the large particle oil molecules by condensation, the air is cooled, so that the indoor air can perform internal circulation.

[0004] Due to the short contact time between the air and the condensation component, some oil fume molecules will still continue to rise. In order to prevent the oil fume molecules from entering the air circulation path, a filter plate is usually set on the path to further remove the oil molecules. However, in daily use, its working environment is not always in a large amount of oil fume. When the amount of oil fume is large, the oil fume needs to pass through the filter layer sufficiently to adsorb large and small molecules in the air. When the amount of oil fume is small and the air conditioner and oil fume integrated machine still needs to be turned on to realize the cooling circulation of the indoor air, at this time, the filter material will block the airflow drawn by the fan, resulting in a reduction in the circulation efficiency. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention proposes a fan system of an air conditioner and oil fume integrated machine and a control method thereof, which can automatically increase the fan speed according to the indoor oil fume amount to suck up the lighter filter material from the mounting rack and keep it in a suspended state, so that the air can pass through the oil fume channel more smoothly, improve the indoor air circulation efficiency, and reduce the energy consumption.

[0006] The present invention proposes a fan system of an air conditioner and oil fume integrated machine, including a housing. An air suction channel is formed in the housing. A fan is provided at the upper end of the air suction channel. A condensation device is provided at the bottom of the air suction channel. A support edge is provided on the inner side wall of the air suction channel. At least one filter plate is mounted on the support edge. The area of the filter plate is smaller than the cross-sectional area of the air suction channel. A gravity sensor is provided on the support edge. A oil fume sensor is provided between the filter plate and the condensation device.

[0007] The second aspect of the present invention proposes a control method applied to the above-mentioned fan system, including the following steps:

[0008] Obtain the power information of the fan and the cross-sectional area of the air suction channel, and construct the force curve of the filter plate under different air volumes;

[0009] Obtain the first weight information of the filter plate in the initial state and calculate the critical force value for the filter plate to be in a suspended state. Obtain the suspended power corresponding to the fan according to the critical force value;

[0010] In response to the startup signal, collect the oil fume concentration information inside the air suction channel and the second weight information of the filter plate, and calculate the compensation power according to the second weight information;

[0011] Determine whether the oil fume concentration is greater than a preset oil fume threshold. When the oil fume concentration is greater than the oil fume threshold, control the fan to output at normal power; when the oil fume concentration is less than the oil fume threshold, control the fan to output at the sum of the suspended power and the compensation power.

[0012] A further technical solution of the embodiment of the present invention is that when obtaining the power information of the fan and the cross-sectional area of the air suction channel and constructing the force curve of the filter plate under different air volumes, it further includes:

[0013] Obtain the exhaust air speed V of the fan at different powers, and calculate the wind pressure generated by the fan according to the following formula:

[0014]

[0015] where p d is the wind pressure, ρ is the air density, v is the air speed in the air suction channel, Q is the current air volume of the fan, and A is the cross-sectional area of the air suction channel;

[0016] Obtain the windward area S of the filter plate, and calculate the first suction force F received by the filter plate according to the following formula:

[0017]

[0018] Establish the force curve of the filter plate with the air volume Q as the horizontal axis and the first suction force F as the vertical axis.

[0019] A further technical solution of the embodiment of the present invention is that when obtaining the first weight information of the filter plate in the initial state and calculating the critical force value for the filter plate to be in a suspended state and obtaining the suspended power corresponding to the fan according to the critical force value, it further includes:

[0020] Preset the upward displacement distance of the filter plate when suspended as x, and calculate the second suction force F' required for the filter plate to be in a suspended state after upward displacement of x;

[0021] Obtain the corresponding air volume Q according to the second suction force F' and the force curve, and control the fan to output at the corresponding power.

[0022] A further technical solution of the embodiment of the present invention is that at least three of the oil fume sensors are arranged at intervals in the air suction channel to collect the oil fume information inside the oil fume channel, and further includes:

[0023] Collect the oil fume concentrations at at least three positions through the oil fume sensors, and use the average value of the collected oil fume concentrations at at least three positions as the oil fume concentration information in the air suction channel.

[0024] A further technical solution of the embodiment of the present invention is that wind speed sensors are arranged on both the upper side and the lower side of the filter plate, and further includes:

[0025] Collect the first wind speed and the second wind speed at both ends of the filter plate, calculate the difference between the first wind speed and the second wind speed, and when the difference is greater than the preset threshold value, the fan performs an air volume increase operation.

[0026] A further technical solution of the embodiment of the present invention is to calculate the compensation power according to the second weight information; and further includes:

[0027] Collect the second weight information of the filter plate, calculate the difference between the second weight information and the first weight information, and calculate the compensation power according to the difference.

[0028] A further technical solution of the embodiment of the present invention is that it further includes:

[0029] When the second weight information is higher than the preset replacement threshold, a consumable replacement warning is issued.

[0030] A further technical solution of the embodiment of the present invention is that it further includes:

[0031] Obtain the temperature information of the condensation plate, and when the temperature information enters the preset temperature range, limit the fan to output at the normal power.

[0032] A further technical solution of the embodiment of the present invention regarding the selection of the temperature range further includes:

[0033] Obtain the condensation efficiency of the oil fume at different temperatures through experiments, use the temperature value when the condensation efficiency is 80% as the demarcation point, and divide the temperature of the condensation plate into at least two ranges.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] In the embodiments of the present invention, by pre - inputting the suction force generated by different powers of the fan on the filter plate, an accurate sensor is set in the oil - fume passage of the device to detect the molecular weight in the oil - fume. When it is determined that the amount of oil - fume is less than the threshold value, the rotation speed of the fan is increased to suck up the lighter filter material from the mounting rack and keep it in a suspended state, thereby enabling air to pass through the oil - fume passage more smoothly and improving the indoor air circulation efficiency.

[0036] In addition, during daily use, oil - fume will adsorb on the filter plate, causing the weight of the filter plate to increase. By enabling the fan to further output a compensation power, it is ensured that the filter plate can still be suspended under different weights. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 It is a schematic flow chart of a control method for a fan system of an air - conditioner and oil - fume integrated machine according to an embodiment of the present invention;

[0039] Figure 2 It is a schematic flow chart of obtaining a force - bearing curve in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0043] See Figures 1 to 2 , an embodiment of the present invention discloses a fan system of an air conditioner and oil fume integrated machine, including a housing. An air suction channel is formed inside the housing. A fan is provided at the upper end of the air suction channel, a condensation device is provided at the bottom of the air suction channel, a support edge is provided on the inner side wall of the air suction channel, at least one filter plate is mounted on the support edge, the area of the filter plate is smaller than the cross-sectional area of the air suction channel, a gravity sensor is provided on the support edge, and an oil fume sensor is provided between the filter plate and the condensation device.

[0044] Specifically, the air suction channel can be vertical; it can also be inclined. In this embodiment, preferably, the air suction channel is vertically up and down to ensure that the suction force generated by the fan on the filter plate in the air suction channel is opposite to the direction of its own weight. Since the area of the filter plate is smaller than the cross-sectional area of the air suction channel, when the filter plate is placed on the support edge, the oil fume air rising from the bottom must pass through the filter plate. When the filter plate is suspended in the air suction channel, the gap between the filter plate and the support edge can allow air to pass quickly, thereby reducing the blockage.

[0045] In order to achieve the suspension of the filter plate, a second aspect of the present invention proposes a control method applied to the fan system as described above, including the following steps:

[0046] 101 Obtain the power information of the fan and the cross-sectional area of the air suction channel, and construct the force curve of the filter plate under different air volumes;

[0047] Specifically, when obtaining the power information of the fan and the cross-sectional area of the air suction channel and constructing the force curve of the filter plate under different air volumes, it further includes:

[0048] Obtain the exhaust air speed V of the fan at different powers, and calculate the wind pressure generated by the fan according to the following formula:

[0049]

[0050] where p d is the wind pressure, ρ is the air density, v is the air speed in the air suction channel, Q is the current air volume of the fan, and A is the cross-sectional area of the air suction channel;

[0051] Those skilled in the art can know that the air volume of the fan can be obtained according to the performance parameters of the fan or actual measurement. If the air volume is not directly given, it can be estimated through parameters such as the rotational speed and impeller diameter of the fan. In actual production, the fan manufacturer usually provides the instruction documents related to the fan for reference, and the different air volumes corresponding to different rotational speeds under different powers of the fan are obtained through experiments.

[0052] Obtain the windward area S of the filter plate, and calculate the first suction force F received by the filter plate according to the following formula:

[0053]

[0054] Taking the air volume Q as the horizontal axis and the first suction force F as the vertical axis, establish the force curve of the filter plate.

[0055] Among them, in this embodiment, by vertically arranging the air suction channel, the windward area of the filter plate is maximized, which can effectively utilize the vertical suction force generated by the fan on the filter plate and reduce the energy consumption of the equipment.

[0056] 102 Obtain the first weight information of the filter plate in the initial state and calculate the critical force value when the filter plate is in a suspended state, and obtain the corresponding suspended power of the fan according to the critical force value;

[0057] Specifically, the acquisition of the suspended power includes the following steps:

[0058] Preset the upward displacement distance of the filter plate when it is suspended as x, and calculate the second suction force F' required for the filter plate to be in a suspended state after upward displacement of x;

[0059] Among them, the upward displacement distance is preferably 1 cm to 5 cm. Those skilled in the art can understand that in order to make the filter plate rise, the second suction force F' is greater than the first suction force F and needs to be obtained through multiple experiments. When the suction force of the fan increases, the filter plate moves upward with uniform variable speed under the combined action of the second suction force F', air resistance and gravity and finally suspends and stops.

[0060] According to the second suction force F' and the force curve, obtain the corresponding air volume Q, and control the fan to output at the corresponding power.

[0061] Among them, since the power information of the fan has been obtained, after determining the air volume Q corresponding to the second suction force through the force curve, the corresponding power can be quickly queried and output.

[0062] 103 In response to the startup signal, collect the oil fume concentration information inside the air suction channel and the second weight information of the filter plate, and calculate the compensation power according to the second weight information;

[0063] Specifically, at least three of the oil fume sensors are spaced apart in the air suction channel, and the oil fume concentrations at at least three positions are collected by the oil fume sensors, and the average value of the oil fume concentrations at the at least three positions collected is used as the oil fume concentration information in the air suction channel.

[0064] Since a large amount of oil fume will be sucked up during the daily use of the range hood, a large amount of oil stains will accumulate on the filter plate. The oil stains will not only further block the air from passing through the filter plate, but also increase the weight of the filter plate, resulting in the inability to suck up the filter plate when the fan outputs the preset suspension power. Therefore, this embodiment proposes to calculate the compensation power according to the second weight information, and further includes:

[0065] Collect the second weight information of the filter plate, calculate the difference between the second weight information and the first weight information, and calculate the compensation power according to the difference.

[0066] Among them, since the weight of the oil stains usually has little influence, calculating the compensation power by the way of difference can improve the accuracy of the oil stain weight measurement, so as to output the required compensation power more precisely.

[0067] 104 Determine whether the oil fume concentration is greater than a preset oil fume threshold. When the oil fume concentration is greater than the oil fume threshold, control the fan to output at the normal power; when the oil fume concentration is less than the oil fume threshold, control the fan to output at the sum of the suspension power and the compensation power.

[0068] Specifically, the normal power refers to the power at which the fan can normally perform the oil fume purification operation and will not suck up the condensation plate, and the setting of the oil fume concentration threshold can be set according to actual needs.

[0069] Preferably in this embodiment, in order to more accurately detect whether the air in the air duct is unblocked, at least one wind speed sensor is provided on both the upper side and the lower side of the filter plate in this embodiment. The first wind speed and the second wind speed on the upper side and the lower side of the filter plate are respectively collected by the wind speed sensor, and the difference between the first wind speed and the second wind speed is calculated. When the difference is greater than the preset value threshold, the fan performs a wind volume increasing operation. When the difference between the first wind speed and the second wind speed is too large, it can be judged that the filter plate is not in a suspended state, and by increasing the wind volume of the fan, the filter plate is sucked up.

[0070] Specifically, the wind volume increasing operation is to increase the power of the fan according to a preset value to increase the fan speed, thereby increasing the wind volume output by the fan. Those skilled in the art can know that the precondition for this wind volume increasing operation is also that the oil fume concentration is less than the oil fume threshold to avoid the oil fume directly entering the circulation channel.

[0071] Preferably, in this embodiment, when the second weight information is higher than a preset replacement threshold, it can be determined that a large amount of oil fume has accumulated on the filter plate. At this time, the filtering effect of the filter plate is greatly weakened. By issuing a consumable replacement warning, the user is prompted to replace the consumable to maintain the oil fume filtering effect.

[0072] Preferably, in this embodiment, the temperature information of the condensation plate is also obtained. When the temperature information enters a preset temperature range, the fan is restricted from outputting at its normal power. Since the temperature of the condensation plate is related to the temperature of the indoor internal circulation, after the user adjusts the temperature, the temperature of the condensation plate will rise. At the same time, when the condensation plate is in use, it is affected by oil fume and the high-temperature oil fume air below, and the temperature further rises, resulting in insufficient condensation of the passing oil fume. Therefore, when the temperature reaches a certain threshold, ensuring that the fan outputs at its normal power can prevent the filter plate from floating up, causing oil fume to enter the indoor circulation.

[0073] Specifically, the selection of the temperature range includes the following steps:

[0074] The condensation efficiency of oil fume at different temperatures is obtained through experiments. Using the temperature value when the condensation efficiency is 80% as the demarcation point, the temperature of the condensation plate is divided into at least two ranges. It can be known to those skilled in the art that as the temperature rises, the condensation efficiency decreases. Therefore, the higher-temperature range is selected as the value for restricting the fan.

[0075] In the embodiment of the present invention, by pre-inputting the action of the suction force generated by different powers of the fan on the filter plate, a sensor is accurately set in the oil fume passage of the device to detect the molecular weight in the oil fume. When it is determined that the amount of oil fume is less than the threshold, the fan speed is increased to suck up the lighter filter material from the mounting rack and keep it in a suspended state, thereby making the air pass through the oil fume passage more smoothly and improving the indoor air circulation efficiency.

[0076] In addition, during daily use, oil fume will adsorb on the filter plate, resulting in an increase in the weight of the filter plate. By making the fan further output a compensation power, it is ensured that the filter plate can still be suspended under different weights.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for a fan system of an air conditioner and oil fume integrated machine, characterized in that, The fan system of this air conditioner and oil fume integrated machine includes a housing. An air suction channel is formed inside the housing. A fan is provided at the upper end of the air suction channel. A condensation device is provided at the bottom of the air suction channel. A support edge is provided on the inner side wall of the air suction channel. At least one filter plate is mounted on the support edge. The area of the filter plate is smaller than the cross-sectional area of the air suction channel. A gravity sensor is provided on the support edge. An oil fume sensor is provided between the filter plate and the condensation device. The control method includes the following steps: Obtain the power information of the fan and the cross-sectional area of the air suction channel, and construct the force curve of the filter plate under different air volumes; Obtain the first weight information of the filter plate in the initial state and calculate the critical force value when the filter plate is in a suspended state. Obtain the corresponding suspended power of the fan according to the critical force value; In response to the startup signal, collect the oil fume concentration information inside the air suction channel and the second weight information of the filter plate, and calculate the compensation power according to the second weight information; Determine whether the oil fume concentration is greater than a preset oil fume threshold. When the oil fume concentration is greater than the oil fume threshold, control the fan to output at normal power; when the oil fume concentration is less than the oil fume threshold, control the fan to output at the sum of the suspended power and the compensation power.

2. The control method according to claim 1, characterized in that When obtaining the power information of the fan and the cross-sectional area of the air suction channel and constructing the force curve of the filter plate under different air volumes, it further includes: Obtain the exhaust air speed v of the fan at different powers, and calculate the wind pressure generated by the fan according to the following formula: Among them, p d is the wind pressure, ρ is the air density, v is the wind speed in the air suction channel, Q is the current air volume of the fan, and A is the cross-sectional area of the air suction channel; Obtain the windward area S of the filter plate, and calculate the first suction force F received by the filter plate according to the following formula: Establish the force curve of the filter plate with the air volume Q as the horizontal axis and the first suction force F as the vertical axis.

3. The control method according to claim 1, wherein When obtaining the first weight information of the filter plate in the initial state and calculating the critical force value when the filter plate is in a suspended state, and obtaining the corresponding suspended power of the fan according to the critical force value, it further includes: Preset the upward displacement distance of the filter plate when it is suspended as x, and calculate the second suction force F' required for the filter plate to be in a suspended state after upward displacement of x; Obtain the corresponding air volume Q according to the second suction force F' and the force curve, and control the fan to output at the corresponding power.

4. The control method according to claim 1, wherein At least three of the oil fume sensors are arranged at intervals in the air suction channel to collect the oil fume information inside the oil fume channel. It further includes: Collect the oil fume concentrations at at least three positions through the oil fume sensors, and use the average value of the oil fume concentrations at the at least three positions collected as the oil fume concentration information in the air suction channel.

5. The control method according to claim 1, wherein Wind speed sensors are provided on both the upper side and the lower side of the filter plate. It further includes: Collect the first wind speed and the second wind speed at both ends of the filter plate, calculate the difference between the first wind speed and the second wind speed. When the difference is greater than the preset threshold value, the fan performs an air volume increase operation.

6. The control method according to claim 1, wherein Calculate the compensation power according to the second weight information. It further includes: Collect the second weight information of the filter plate, calculate the difference between the second weight information and the first weight information, and calculate the compensation power according to the difference.

7. The control method according to claim 1, wherein It further includes: When the second weight information is higher than a preset replacement threshold, a warning for consumable replacement is issued.

8. The control method according to claim 1, characterized in that It further includes: Obtain the temperature information of the condensing device, and when the temperature information enters a preset temperature range, limit the fan to output at a normal power.

9. The control method according to claim 8, characterized in that The selection of the temperature range further includes: Obtain the condensation efficiency of lampblack at different temperatures through experiments, use the temperature value when the condensation efficiency is 80% as a demarcation point, and divide the temperature of the condensing device into at least two ranges.

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