Infrared temperature measurement system of range hood, range hood and control method of range hood

Abstract

The invention provides an infrared temperature measurement system of a range hood, the range hood and a control method of the range hood, the infrared temperature measurement system comprises an exhaust fume collecting hood, the exhaust fume collecting hood is provided with an exhaust fume gathering part, and an infrared probe is arranged on the bottom surface of the exhaust fume gathering part; and a reflecting mirror for reflecting infrared light of flame of the stove to the infrared probe is arranged below the exhaust fume collecting hood. The range hood comprises the infrared temperature measurement system, a fan and a control system. The control method comprises the following steps that infrared data are collected at preset time intervals through the infrared probe, the temperature slope of the temperature value of the stove burner in preset time is calculated, and the fan is controlled. According to the infrared temperature measurement system of the range hood, the range hood and the control method of the range hood, the influence that cooker flame infrared light is blocked by a cooker can be reduced, and cooker flame temperature detection is more direct and effective.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and particularly to an infrared temperature measurement system for a range hood, a range hood, and a control method thereof. Background Art

[0002] Infrared temperature measurement technology has been used in the linkage scenario of range hoods and cooktops, such as the range hood is turned on or off according to the temperature of the cooktop, and when the temperature of the cooktop is too high, the range hood actively adjusts the air volume and issues a dry-burning alarm prompt, etc. At present, products on the market generally use single-point or double-point infrared temperature measurement probes to achieve the above functions. Among them, the single-point probe samples the average temperature of the two burners of the cooktop as one input signal, and the double-point probe samples the respective temperatures of the two burners of the cooktop as two input signals. The processor of the range hood processes the input signals through algorithms and then outputs the fan linkage actions. However, when there is a cooking utensil blocking the flame above the burner of the cooktop, the temperature of the cooktop detected by the range hood will be deviated, resulting in a delay in the linkage action and affecting the user experience.

[0003] Therefore, there is a need to provide an improved technical solution for the deficiencies of the above-mentioned existing technologies. Summary of the Invention

[0004] The purpose of the present invention is to provide an infrared temperature measurement system for a range hood, which can reduce the influence of the infrared light of the cooktop flame being blocked by the cooking utensil, and make the detection of the cooktop flame temperature more direct and effective.

[0005] Another purpose of the present invention is to provide a range hood, which includes the above-mentioned infrared temperature measurement system, and can reduce the influence of the infrared light of the cooktop flame being blocked by the cooking utensil, and make the detection of the cooktop flame temperature more direct and effective.

[0006] Another purpose of the present invention is to provide a control method for the above-mentioned range hood, which uses the above-mentioned infrared temperature measurement system and can adjust the fan speed according to the temperature of the cooktop to improve the user experience.

[0007] In order to achieve the above purposes, the present invention provides the following technical solutions: An infrared temperature measurement system for a range hood, including a smoke collecting hood, the smoke collecting hood is provided with a smoke gathering part, and an infrared probe is provided on the bottom surface of the smoke gathering part; a reflecting mirror is provided below the smoke collecting hood for reflecting the infrared light of the cooktop flame to the infrared probe.

[0008] According to an embodiment of the present invention, the number of the reflecting mirrors is two, corresponding to the two burners of the cooktop respectively.

[0009] According to an embodiment of the present invention, the infrared probe includes a first probe, a second probe, and a third probe arranged horizontally in sequence; the first probe and the third probe respectively correspond to the two burners of the cooktop.

[0010] According to one embodiment of the present invention, the field of view of the first probe and the third probe is 30 degrees, and the field of view of the second probe is 60 degrees.

[0011] According to one embodiment of the present invention, the smoke hood is inverted L-shaped, and the smoke hood includes a horizontal smoke collection part and a vertical air inlet part; the reflector is disposed on the outside of the air inlet part.

[0012] According to one embodiment of the present invention, the reflector is a plane mirror.

[0013] The present invention also provides a smoke hood, including the above-mentioned infrared temperature measurement system, and further including a fan and a control system.

[0014] The present invention also provides a control method for the above-mentioned smoke hood, comprising the following steps: Infrared data is collected by the infrared probe at predetermined time intervals, the temperature slope of the stove's burner head over the predetermined time is calculated, and the fan is controlled according to the following judgment logic: a. If the temperature slope is greater than the slope limit when the fan is not turned on, then the fan is turned on and adjusted to low speed operation; b. If the temperature of the burner head of the stove exceeds the temperature limit when the fan is not turned on, the fan shall be turned on and set to a low speed. c. If the temperature slope is less than the slope limit when the fan is already turned on, then the fan shall be turned off. d. If the temperature of the burner head of the stove is less than the temperature limit when the fan is already turned on, the fan shall be turned off.

[0015] According to one embodiment of the present invention, the infrared detector includes a first detector, a second detector, and a third detector arranged horizontally in sequence; the first detector and the third detector respectively correspond to the two burners of the stove; Infrared data is collected at predetermined time intervals using the first, second, and third probes; the temperature slope of the two burners of the stove within a predetermined time period is calculated using the first and third probes respectively, and the fan is controlled according to the following judgment logic: a. If the temperature slope of any burner head is greater than the slope limit when the fan is not turned on, the fan shall be turned on and adjusted to low speed operation. b. If the temperature of any burner exceeds the temperature limit when the fan is not turned on, the fan shall be turned on and set to low speed. c. If the temperature slope of any burner head is less than the slope limit when the fan is already turned on, the fan shall be turned off. d. If the temperature of any burner is lower than the temperature limit while the fan is already running, the fan shall be shut down.

[0016] According to one embodiment of the present invention, the cookware on the two burners of the stove is a left pot and a right pot, respectively; the temperature value measured by the first probe is Ta and corresponds to the left pot, the temperature value measured by the second probe is Tb, and the temperature value measured by the third probe is Tc and corresponds to the right pot; the temperatures of the left pot and the right pot are calculated respectively using the following formulas: The temperature of the left pot ; The temperature of the right pot ; With the fan already running, the fan speed is adjusted at regular intervals according to the following logic: e. Calculate the difference between the current temperature Tl of the left pot and the temperature Tl' of the left pot in the previous unit of time. If the temperature difference of the left pot is greater than... If the temperature difference between the left and right pots is greater than Ta / 3 and less than..., the fan will automatically adjust to the high setting. Then the fan will automatically adjust to the medium speed; f. Calculate the difference between the current temperature value Tr of the right pot and the temperature value Tr' of the right pot in the previous unit of time. If the temperature difference of the right pot is greater than... If the temperature difference of the right pot is greater than Tc / 3 and less than Tc / 3, the fan will automatically switch to high speed. Then the fan will automatically adjust to the medium speed; g. Except for cases e and f above, the fan shall be operated at a low speed.

[0017] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present invention are as follows: The infrared temperature measurement system, range hood, and control method for the range hood provided in this invention allow for the following: When there is a cooking utensil (e.g., a pot) on the burner, the flame of the burner is blocked from the infrared probe by the cooking utensil. The infrared light from the burner flame can be reflected by a reflector to the infrared probe, while the infrared light from the cooking utensil can directly radiate to the infrared probe. This reduces the impact of the cooking utensil blocking the infrared light of the burner flame, making the detection of the burner flame temperature more direct and effective. It can detect both the temperature of the burner flame and the surface temperature of the cooking utensil, achieving multi-dimensional detection. Furthermore, when there is no cooking utensil on the burner, the infrared light from the burner flame can be reflected by the reflector under the smoke hood to the infrared probe, or it can directly radiate to the infrared probe. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a side view of the infrared temperature measurement system for a smoke hood provided in an embodiment of the present invention; Figure 2 This is a front view of the infrared temperature measurement system for a smoke hood provided in an embodiment of the present invention; Figure 3 This is a front view of an infrared temperature measurement system for a smoke hood provided in another embodiment of the present invention; Figure 4 The control flowchart is shown in the embodiment of the present invention for the control method of the smoke hood.

[0019] Explanation of reference numerals in the attached figures: 1. Smoke hood; 11. Smoke collection section; 12. Air inlet section; 2. Infrared probe; A. First probe; B. Second probe; C. Third probe; 3. Reflector; 4. Stove; 41. Burner head; 5. Cooking utensils; 51. Left pot; 52. Right pot. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0021] In the description of this invention, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects. The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0022] like Figure 1 As shown, this embodiment of the invention provides an infrared temperature measurement system for a range hood, including a smoke collection hood 1, which has a smoke gathering part 11, and an infrared probe 2 is provided on the bottom surface of the smoke gathering part 11. A reflector 3 is provided below the smoke collection hood 1 for reflecting the infrared light from the stove flame onto the infrared probe 2.

[0023] like Figure 1 , Figure 2 As shown, in use, when the infrared temperature measurement system of the range hood provided in this embodiment of the invention has a cooking utensil 5 (e.g., a pot) on the burner 41 of the stove 4, the flame of the burner 41 is blocked from the infrared probe 2 by the cooking utensil 5. The infrared light of the flame of the stove 4 can be reflected to the infrared probe 2 by the reflector 3, and the infrared light of the cooking utensil 5 can be directly radiated to the infrared probe 2. This reduces the influence of the infrared light of the flame of the stove 4 being blocked by the cooking utensil 5, making the detection of the flame temperature of the stove 4 more direct and effective. It can detect both the temperature of the flame of the stove 4 and the surface temperature of the cooking utensil 5, achieving multi-dimensional detection. In addition, when there is no cooking utensil 5 on the burner 41 of the stove 4, the infrared light of the flame of the stove 4 can be reflected to the infrared probe 2 by the mirror surface of the reflector 3 under the smoke hood 1, or it can be directly radiated to the infrared probe 2.

[0024] In one embodiment of the present invention, the reflector 3 is a plane mirror.

[0025] like Figure 2 As shown, for a stove 4 with two burners 41, in one embodiment of the present invention, the number of reflectors 3 is two, corresponding to the two burners 41 of the stove 4 respectively. Further, as... Figure 3 As shown, the infrared detector 2 includes a first detector A, a second detector B, and a third detector C arranged horizontally in sequence. The first detector A and the third detector C correspond to the two burners 41 of the stove 4, respectively, to receive the infrared light emitted by the flames of the two burners 41 reflected by the reflector 3. Figure 2 As shown, the propagation path of infrared light is clearly illustrated: The burner 41 on the left side of the stove 4 is obstructed by cooking utensils 5; the infrared light from the flame is reflected by the mirror surface of the reflector 3 to the infrared probe 2, while the infrared light from the cooking utensils 5 directly radiates to the infrared probe 2. The burner 41 on the right side of the stove 4 is unobstructed by cooking utensils; the infrared light from the flame is reflected by the mirror surface of the reflector 3 to the infrared probe 2, or it can directly radiate to the infrared probe 2.

[0026] Furthermore, the field of view of the first probe A and the third probe C is 30 degrees, and the field of view of the second probe B is 60 degrees. Among them, the first probe A and the third probe C are narrow-angle probes, specifically for receiving the infrared reflected light from the flame of the stove 4, and the second probe B is a wide-angle probe, specifically for receiving the infrared radiation light from the cookware 5 on the burner 41 of the stove 4. This received value is the average value of the infrared light radiated from the front of the cookware 5 on the left and right burners.

[0027] The reflector 3 can be detached from the smoke hood 1 and installed independently below the smoke hood 1. Alternatively, the reflector 3 can be directly connected to the smoke hood 1, such as... Figure 1 , Figure 2 As shown, in one embodiment of the present invention, the smoke hood 1 is inverted L-shaped, and includes a horizontal smoke collection section 11 and a vertical air intake section 12. The reflector 3 is disposed on the outside of the air intake section 12. Specifically, the smoke hood 1 is located about 70cm above the stove 4, the infrared detector 2 is disposed on the upper smoke collection section 11 near the front end of the user, and the reflector 3 is disposed on the lower air intake section 12 away from the rear end of the user.

[0028] The present invention also provides a smoke hood, including the aforementioned infrared temperature measurement system, as well as a fan and a control system. The fan can have low, medium, and high speed settings depending on the airflow intensity, and the control system can control the fan's speed settings.

[0029] like Figure 4 As shown, the present invention also provides a control method for the above-mentioned range hood, comprising the following steps: The infrared probe 2 collects infrared data at predetermined time intervals, calculates the temperature slope of the burner head 41 of the stove 4 within the predetermined time, and controls the fan according to the following judgment logic: a. If the temperature slope (the slope of the temperature rise) is greater than the slope limit when the fan is not turned on, then turn on the fan and adjust it to low speed operation. b. If the temperature value of the 4 burners 41 of the stove exceeds the temperature limit when the fan is not turned on, turn on the fan and adjust it to low speed. c. If the temperature slope (the slope of temperature decrease) is less than the slope limit when the fan is already turned on, then the fan shall be turned off. d. If the temperature of the burner 41 of the stove is less than the temperature limit when the fan is already turned on, the fan shall be turned off.

[0030] In one embodiment of the present invention, the predetermined time interval can be 0.5s or 5s. When calculating the temperature slope, data filtering can be achieved by calculating the average of the five most recent temperature values ​​within the predetermined time interval to obtain an infrared filtered value, and then the temperature slope of the furnace head 41 temperature value within the predetermined time interval can be calculated.

[0031] like Figure 3 As shown, in one embodiment of the present invention, the infrared probe 2 includes a first probe A, a second probe B and a third probe C arranged horizontally in sequence; the first probe A and the third probe C respectively correspond to the two burners 41 of the stove 4; Infrared data is collected at predetermined time intervals using the first probe A, the second probe B, and the third probe C; the temperature slope of the two burners 41 of the stove 4 within a predetermined time period is calculated using the first probe A and the third probe C respectively, and the fan is controlled according to the following judgment logic: a. If the temperature slope (the slope of temperature increase) of any burner head 41 is greater than the slope limit when the fan is not turned on, the fan will be turned on and adjusted to low speed operation. b. If the temperature of any burner 41 exceeds the temperature limit when the fan is not turned on, the fan will be turned on and set to low speed. c. If the temperature slope (the slope of temperature decrease) of any burner 41 is less than the slope limit when the fan is already turned on, the fan shall be turned off. d. If the temperature of any burner head 41 is lower than the temperature limit while the fan is already running, the fan shall be shut down.

[0032] In one embodiment of the present invention, the predetermined time interval can be 0.5s or 5s. When calculating the temperature slope of the two burners 41, data filtering can be achieved by calculating the average of the five most recent temperature values ​​within the predetermined time interval to obtain infrared filtered values, and then the temperature slope of the two burners 41 within the predetermined time interval can be calculated respectively.

[0033] Furthermore, such as Figure 3 , Figure 4As shown, the cookware 5 on the two burners 41 of the stove 4 are the left pot 51 and the right pot 52, respectively; the temperature value measured by the first probe A is Ta and corresponds to the left pot 51, the temperature value measured by the second probe B is Tb, and the temperature value measured by the third probe C is Tc and corresponds to the right pot 52; the temperatures of the left pot 51 and the right pot 52 are calculated using the following formulas: The temperature of the left pot is 51. ; The temperature of the right pot is 52. .

[0034] The derivation of the above formula is as follows: With the fan already turned on, the temperature inside the pots is estimated by combining the average temperature values ​​of the left pot 51 and the right pot 52 (temperature Tb measured by the second probe B), and the total temperature is... Based on the equivalent ratio of flame temperature to pot temperature, the formulas for the temperature Tl of the left pot 51 and the temperature Tr of the right pot 52 are derived according to the formula: pot temperature = total temperature * pot temperature ratio.

[0035] With the fan already running, adjust the fan speed every unit of time (e.g., 5 seconds) according to the following logic: e. Calculate the difference between the current temperature Tl of the left pot 51 and the temperature Tl' of the left pot 51 in the previous unit of time. If the temperature difference of the left pot 51 is greater than... The fan will automatically switch to high speed. If the temperature difference of the left pot 51 is greater than Ta / 3 and less than... If so, the fan will automatically adjust to the medium speed; f. Calculate the difference between the current temperature value Tr of the right pot 52 and the temperature value Tr' of the right pot 52 in the previous unit of time. If the temperature difference of the right pot 52 is greater than... The fan will automatically switch to high speed. If the temperature difference of the right pot 52 is greater than Tc / 3 and less than Tc / 3, the fan will automatically switch to high speed. If so, the fan will automatically adjust to the medium speed; g. Except for cases e and f above, the fan maintains low-speed operation.

[0036] After the range hood fan automatically adjusts its speed, it records the current temperature inside the pot as the calculation parameter for the next 5 seconds, i.e., Tl'=Tl, Tr'=Tr.

[0037] The fan and its control method provided by this invention enable the range hood to adjust its speed according to the flame and cookware surface temperatures, achieving closed-loop regulation of temperature, smoke volume, and air volume. By combining the temperature sampling values ​​from three infrared sensors, the temperatures of the left and right burners and cookware surface are calculated, making the judgment results closer to the actual cooking situation.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An infrared temperature measurement system for a range hood, characterized in that, Includes a smoke collection hood (1), the smoke collection hood (1) is provided with a smoke collection part (11), the bottom surface of the smoke collection part (11) is provided with an infrared probe (2); a reflector (3) is provided below the smoke collection hood (1) for reflecting the infrared light of the stove (4) flame to the infrared probe (2).

2. The infrared temperature measurement system for the smoke hood according to claim 1, characterized in that, There are two reflectors (3), which correspond to the two burners (41) of the stove (4).

3. The infrared temperature measurement system for the smoke hood according to claim 2, characterized in that, The infrared probe (2) includes a first probe, a second probe and a third probe arranged horizontally in sequence; the first probe and the third probe correspond to the two burners (41) of the stove (4) respectively.

4. The infrared temperature measurement system for the smoke hood according to claim 3, characterized in that, The field of view of the first probe and the third probe is 30 degrees, and the field of view of the second probe is 60 degrees.

5. The infrared temperature measurement system for the smoke machine according to any one of claims 1 to 4, characterized in that, The smoke hood (1) is inverted L-shaped and includes a horizontal smoke collection part (11) and a vertical air inlet part (12); the reflector (3) is located outside the air inlet part (12).

6. The infrared temperature measurement system for the smoke machine according to any one of claims 1 to 4, characterized in that, The reflector (3) is a plane mirror.

7. A range hood, characterized in that, The infrared temperature measurement system according to any one of claims 1 to 6 further includes a fan and a control system.

8. A control method for a smoke machine according to claim 7, characterized in that, Includes the following steps: Infrared data is collected by the infrared probe (2) at predetermined time intervals, the temperature slope of the burner head (41) of the stove (4) within the predetermined time is calculated, and the fan is controlled according to the following judgment logic: a. If the temperature slope is greater than the slope limit when the fan is not turned on, then the fan is turned on and adjusted to low speed operation; b. If the temperature of the burner (41) of the stove (4) is greater than the temperature limit when the fan is not turned on, the fan is turned on and adjusted to low speed. c. If the temperature slope is less than the slope limit when the fan is already turned on, then the fan shall be turned off. d. If the temperature of the burner (41) of the stove (4) is less than the temperature limit when the fan is already turned on, the fan shall be turned off.

9. The control method for a smoke machine according to claim 8, characterized in that, The infrared probe (2) includes a first probe, a second probe and a third probe arranged horizontally in sequence; the first probe and the third probe correspond to the two burners (41) of the stove (4) respectively. Infrared data is collected at predetermined time intervals using the first, second, and third probes; the temperature slope of the two burners (41) of the stove (4) within a predetermined time period is calculated using the first and third probes respectively, and the fan is controlled according to the following judgment logic: a. If the temperature slope of any burner head (41) is greater than the slope limit when the fan is not turned on, the fan is turned on and adjusted to low speed. b. If the temperature of any burner head (41) is greater than the temperature limit when the fan is not turned on, the fan is turned on and adjusted to low speed. c. If the temperature slope of any burner head (41) is less than the slope limit when the fan is already turned on, the fan shall be turned off. d. If the temperature of any of the burners (41) is less than the temperature limit when the fan is already turned on, the fan shall be turned off.

10. The control method for a smoke machine according to claim 9, characterized in that, The cookware (5) on the two burners (41) of the stove (4) are a left pot (51) and a right pot (52) respectively; the temperature value measured by the first probe is Ta and corresponds to the left pot (51), the temperature value measured by the second probe is Tb, and the temperature value measured by the third probe is Tc and corresponds to the right pot (52); the temperatures of the left pot (51) and the right pot (52) are calculated by the following formulas respectively: The temperature of the left pot (51) ; The temperature of the right pot (52) ; With the fan already running, the fan speed is adjusted at regular intervals according to the following logic: e. The difference between the current temperature value Tl of the left pot (51) and the temperature value Tl' of the left pot (51) in the previous unit time is calculated. If the temperature difference of the left pot (51) is greater than... Then the fan will automatically switch to high speed. If the temperature difference between the left pot (51) and the temperature difference is greater than Ta / 3 and less than Ta / 3, the fan will automatically switch to high speed. Then the fan will automatically adjust to the medium speed; f. Calculate the difference between the current temperature value Tr of the right pot (52) and the temperature value Tr' of the right pot (52) in the previous unit time. If the temperature difference of the right pot (52) is greater than... Then the fan will automatically switch to high speed. If the temperature difference between the right pot (52) and Tc / 3 is greater than Tc / 3 and less than Tc / 3, the fan will automatically switch to high speed. Then the fan will automatically adjust to the medium speed; g. Except for cases e and f above, the fan shall be operated at a low speed.

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