Heating furnace

Abstract

The utility model provides a heating furnace. The heating furnace comprises a bottom shell, a heating element and a heating element, the panel is installed on the bottom shell, an accommodating cavity is defined by the panel and the bottom shell, at least one through hole is formed in the panel, and the panel is used for bearing cookware; the light-transmitting sheet is arranged in the through hole; the first infrared receiving sensor is positioned in the accommodating cavity and is used for receiving infrared light in a first target wave band; the second infrared receiving sensor is positioned in the accommodating cavity and is used for receiving infrared light in a second target wave band; wherein the temperature of the cookware can be determined through the infrared light received by the first infrared receiving sensor and the infrared light received by the second infrared receiving sensor.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen equipment, and in particular to a heating stove. Background Art

[0002] Induction cookers / stoves and other heating stoves achieve non-contact temperature measurement of pots by setting multiple infrared sensors under the glass panel. However, the infrared temperature measurement of induction cookers / stoves has the following problems: the infrared rays of the pots attenuate after passing through the panel. Therefore, when the temperature of the pot is high, the infrared signal from the pot received by the infrared sensor is relatively strong, and the temperature measurement of the pot is relatively accurate. However, when the temperature of the pot is lower than 120°C, the infrared signal intensity generated by the pot is low, and the infrared signal attenuates again after passing through the panel, making the infrared signal received by the infrared temperature measurement module very weak. Therefore, the accuracy of the pot temperature determined by the signal is low, so the product cannot accurately measure the temperature.

[0003] Therefore, when using infrared sensors to achieve non-contact temperature measurement of cookware, how to ensure the accuracy of temperature measurement has become a problem that needs to be solved urgently. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] To this end, a first aspect of the present application is to provide a heating oven.

[0006] In view of this, the technical solution of the first aspect of the present application provides a heating stove, including: a bottom shell; a panel, installed on the bottom shell, forming a accommodating cavity with the bottom shell, the panel is provided with at least one through hole, and the panel is used to carry the cookware; a light-transmitting sheet, arranged in the through hole; a first infrared receiving sensor, located in the accommodating cavity, for receiving infrared light within a first target band; a second infrared receiving sensor, located in the accommodating cavity, for receiving infrared light within a second target band; wherein the infrared light received by the first infrared receiving sensor and the infrared light received by the second infrared receiving sensor can determine the temperature of the cookware.

[0007] The heating stove provided by the present application includes a panel, a bottom shell, a light-transmitting sheet, a first infrared receiving sensor and a second infrared receiving sensor. The panel is used to carry the pot. The panel and the bottom shell constitute the outer shell structure of the heating stove. The outer shell structure is used to accommodate the first infrared receiving sensor, the second infrared receiving sensor, the heating coil, the control device and other parts. The light-transmitting sheet can transmit light, so that the infrared rays generated by the pot can pass through the light-transmitting sheet and be received by the infrared sensor, so that the temperature of the pot can be determined by the received infrared light, thereby realizing non-contact temperature measurement of the pot. In view of the good light transmittance of the light-transmitting sheet, the infrared rays are less attenuated after passing through the light-transmitting sheet, so that the infrared receiving sensor can receive a stronger infrared signal, so that when the temperature of the pot is determined by the signal, the accuracy of the determined pot temperature can be improved.

[0008] Among them, for different heating objects, the temperature of the heating objects is different, and the wavelength band of the infrared rays generated is also different. When the pot is working, its temperature is generally high, so the wavelength of the infrared rays it generates is generally short, while the temperature of the panel and the like is low, so the wavelength of the infrared rays it generates is generally long. Therefore, based on this principle, the present application sets two infrared receiving sensors that can receive infrared light of different wavelengths. Among them, the first infrared receiving sensor is used to receive infrared light within the first target band, and the first target band corresponds to the band of infrared light reflected by the pot, that is, the first infrared receiving sensor is used to receive infrared light from the pot. The second infrared receiving sensor is suitable for receiving infrared light within the second target band, generally infrared light from the panel, coil disk, etc., that is, the second infrared receiving sensor is used to receive infrared rays from objects other than the pot. Thereafter, the temperature of the pot can be determined based on the infrared light received by the first infrared receiving sensor and the infrared light received by the second infrared receiving sensor.

[0009] Furthermore, the heating stove also includes a control device connected to the first infrared receiving sensor and the second infrared receiving sensor, and used to determine the temperature of the pot according to the infrared light received by the first infrared receiving sensor and the infrared light received by the second infrared receiving sensor. Specifically, the temperature of the pot can be determined according to the infrared light received by the first infrared receiving sensor, and then the temperature of the pot can be calibrated according to the infrared light received by the second infrared receiving sensor, so that non-contact temperature measurement of the pot can be achieved.

[0010] In addition, this structure only sets part of the panel as the light-transmitting sheet, rather than setting the entire panel as the light-transmitting structure, thereby reducing the cost of the panel.

[0011] In one possible design, the first target band is adapted to the band of the red line from the cookware. The first target band is 3μm-4.5μm. According to the temperature at which the cookware is heated, the band of infrared rays generally generated is less than 5μm, generally 3μm-4.5μm. Therefore, the first target band is set to 3μm-4.5μm, so that the band range of infrared rays that the first infrared receiving sensor can receive is consistent with the band range of infrared rays from the cookware, so that the infrared rays received by the first infrared receiving sensor can be used as infrared rays from the cookware, so that the temperature of the cookware can be predicted based on the infrared rays, thereby realizing non-contact temperature measurement of the cookware.

[0012] In a possible design, the second target band is 5 μm-15 μm, which corresponds to the wavelength of infrared rays generated by the panel, etc., so that infrared rays from objects other than pots can be accurately received by the second infrared receiving sensor.

[0013] In a possible design, the heating furnace further includes: a fan assembly, located in the accommodating cavity, for dissipating heat from the light-transmitting sheet.

[0014] When performing non-contact infrared temperature measurement on a cooker, since the actual requirement is to test the temperature of the cooker, if the panel temperature is too high, it will interfere with the detected radiation intensity of the cooker. Based on this, the present application specifically provides a fan assembly, which is used to make air flow, so that cold air can be blown to the light-transmitting plate and / or the panel through the fan assembly, thereby achieving heat dissipation of the light-transmitting plate and / or the panel, thereby reducing the interference of the heat of the light-transmitting plate and / or the panel on the detected radiation intensity of the cooker, making the temperature measurement of the cooker more accurate.

[0015] Furthermore, the panel is a light-transmitting panel, such as a black crystal glass panel. The light transmittance of the panel can be set to be fully transparent or partially transparent as required.

[0016] In one possible design, the first infrared receiving sensor includes an infrared receiving range, the transparent sheet is at least partially located within the infrared receiving range, and the area of ​​the panel corresponding to the infrared receiving range is the first area, the area of ​​the first area is S, and the area of ​​overlap between the transparent sheet and the first area is greater than or equal to S / 5.

[0017] In this technical solution, the angle at which the first infrared receiving sensor can receive infrared is determined. Therefore, the range of the panel corresponding to the infrared receiving sensor that can receive infrared rays is the infrared receiving range. The area of ​​the panel corresponding to this range is the first area, and the infrared light passing through the first area can be received by the first infrared receiving sensor. The infrared light outside the first area basically cannot be received by the first infrared receiving sensor. The first area is the effective lighting area of ​​the first infrared receiving sensor. The through hole is set in the first area, so that after the light-transmitting sheet is installed at the through hole, it can be ensured that the light of the light-transmitting sheet can be received by the first infrared receiving sensor. At the same time, in order to ensure that the infrared rays from the pot can be received by the first infrared receiving sensor as much as possible, that is, in order to increase the strength of the signal received by the first infrared receiving sensor, the area of ​​the through hole and the light-transmitting sheet can be set larger, generally speaking, not less than S / 5.

[0018] In a possible design, the first infrared receiving sensor includes an infrared receiving angle, and two sides of the infrared receiving angle intersect with the inner surface of the panel at points A and B.

[0019] The area formed by point A and point B as the diameter is the first area; the area where the through hole and the first area overlap is greater than or equal to (d×d×π / 4) / 5. d is equal to the distance between point A and point B.

[0020] In a possible design, the through hole is a circular hole, the light-transmitting sheet is a circular sheet, and the diameter of the through hole is the distance between point A and point B.

[0021] This setting can ensure that the range of the light-transmitting sheet is basically consistent with that of the first area, so that the infrared rays passing through the light-transmitting sheet can be received more by the first infrared receiving sensor, thereby ensuring the strength of the infrared signal received by the first infrared receiving sensor, thereby ensuring the accuracy of the cookware temperature calculated based on infrared temperature measurement.

[0022] In a possible design, the shape of the light-transmitting sheet includes at least one of a circle, a square, a dot matrix or a polygon. The shape of the light-transmitting sheet can be set arbitrarily according to actual needs, but it is necessary to ensure that the overlapping area between the light-transmitting sheet and the light-sensitive range of the first infrared receiving sensor is not too low, otherwise the intensity of the infrared signal received by the first infrared receiving sensor cannot be ensured.

[0023] In a possible design, the light-transmitting sheet is a zinc selenide piece. That is, the light-transmitting sheet is made of zinc selenide. Zinc selenide has good light transmittance and can reduce the attenuation of infrared rays, thereby ensuring that the infrared rays from the pot can pass through the light-transmitting sheet and be received by the first infrared receiving sensor.

[0024] In a possible design, the heating stove further includes: a pot detection unit, which can cooperate with the pot to generate detection parameters.

[0025] Existing heating stoves with infrared non-contact temperature measurement cannot determine whether there is a pot. As long as the heating stove starts heating, it will heat up regardless of whether there is a pot on the panel. However, heating when there is no pot on the panel not only wastes electricity, but is also dangerous. The pot detection unit can detect whether there is a pot, so that heating can be performed only when it is detected that there is a pot on the panel. When there is no pot on the panel, the product is controlled not to heat up, or whether to continue heating is determined based on whether the user is away. This can not only improve energy utilization, but also reduce safety hazards caused by product empty burning.

[0026] In one possible design, the heating stove also includes: a third infrared transmitting sensor, used to emit infrared light in a third target band; a fourth infrared receiving sensor, used to receive an infrared light reflection signal after the infrared light in the third target band is reflected by the cookware, and the infrared light reflection signal is used to determine the color of the cookware and / or whether the cookware exists.

[0027] In this technical solution, the third infrared transmitting sensor and the fourth infrared receiving sensor form an infrared pair sensor, through which the presence of a pot can be detected. The reason is that the infrared light reflected signal strength of the infrared light of the third target band after being reflected by the pot is different when there is a pot and when there is no pot, and the presence of a pot on the panel can be determined based on the signal strength.

[0028] In addition, the third infrared transmitting sensor and the fourth infrared receiving sensor form an infrared pair sensor, through which the color of the cookware can be detected. The reason is that different colors of cookware reflect infrared rays differently, so the infrared light reflection signal intensity of the infrared light of the third target band after being reflected by cookware of different colors is different, and the color of the cookware can be determined based on the signal intensity. Considering that the infrared rays generated by cookware of different colors after being heated are also different, therefore, after determining the color of the cookware, the temperature of the cookware can be corrected by the color of the cookware.

[0029] In a possible design, the heating stove also includes: a metal plate located in the accommodating cavity and arranged on the panel, and the capacitance of the metal plate can change according to whether the pot is present; a signal acquisition device connected to the metal plate and used to collect the capacitance of the metal plate.

[0030] In this technical solution, the capacitance of the metal plate is different when there is a pot and when there is no pot. Therefore, by detecting the capacitance of the metal plate, it is possible to simply and conveniently determine whether there is a pot on the panel. The signal acquisition device is specifically used to detect the capacitance of the metal plate, and the signal collected by the signal acquisition device can determine whether there is a pot on the panel.

[0031] In a possible design, the inner diameter of the through hole is consistent along the thickness direction of the panel; and / or the thickness of the light-transmitting sheet and / or the axial length of the through hole is equal to the thickness of the panel.

[0032] Furthermore, the thickness of the light-transmitting sheet and / or the axial length of the through hole is equal to the thickness of the panel, that is, the entire thickness of the panel is consistent, and the front side of the light-transmitting sheet is flush or substantially flush with the front side of the panel, and the back side of the light-transmitting sheet is also flush or substantially flush with the back side of the panel, that is, the axial length of the through hole and the thickness of the panel are consistent or substantially consistent, and the light-transmitting sheet is arranged in the through hole, not on the end face of the through hole, that is, the light-transmitting sheet occupies the position of the through hole, and the through hole is not a stepped hole, but the inner diameter of the through hole is consistent along the thickness direction of the panel, that is, the inner diameter of the through hole is constant and consistent in the axial direction of the through hole.

[0033] In a possible design, the heating stove also includes a heating device, such as a heating coil. The heating device is located in the accommodating cavity and is used to heat the pot. The heating device can be an electromagnetic heating coil, and its specific principle is: the heating coil generates an alternating electromagnetic field, and the pot in the alternating electromagnetic field generates eddy currents inside due to electromagnetic induction, thereby forming active heating, thereby achieving electromagnetic heating of the pot.

[0034] In a possible design, the heating furnace further includes a light guide channel, one end of which is sealed and connected to the panel. The first infrared receiving sensor is located in the light guide channel, so as to reduce the influence of infrared rays from the panel and the like on the detection result of the first infrared receiving sensor.

[0035] In any of the above technical solutions, an air inlet and an air outlet are provided on the bottom shell, the air inlet and the air outlet are connected through an air duct, and the fan assembly is arranged in the air duct. The wind in the air duct passes through the light-transmitting sheet. In this way, the wind passing through the air duct can dissipate heat from the light-transmitting sheet. Specifically, the air duct includes a first air duct, and the wind in the first air duct passes through the light-transmitting sheet to dissipate heat from the light-transmitting sheet. The first infrared receiving sensor and the like are installed in the first air duct.

[0036] In one possible design, the fan assembly is a centrifugal fan, and the projections of the fan assembly and the infrared temperature measurement module composed of multiple infrared sensors on the panel do not overlap; or the fan assembly is located on the side of the infrared temperature measurement module away from the panel, and the projections of the fan assembly and the infrared temperature measurement module on the panel at least partially overlap, and the fan assembly is an axial flow fan.

[0037] In this technical solution, the fan assembly can be a centrifugal fan or an axial flow fan, and the centrifugal fan needs to be arranged on the left and right sides of the infrared temperature measurement module, that is, the two need to be arranged horizontally, so the projections of the fan assembly and the infrared temperature measurement module on the panel do not overlap, thereby reducing the overall thickness of the product. The axial flow fan needs to be arranged on the lower side of the infrared temperature measurement module, so the projections of the fan assembly and the infrared temperature measurement module on the panel at least partially overlap, that is, the two need to be arranged vertically, thereby reducing the overall width of the product, but the thickness will be relatively increased. Therefore, the form of the fan assembly can be flexibly selected according to actual needs during the actual production process, and is not limited to centrifugal fans or axial flow fans.

[0038] In a possible design, the panel is generally a light-transmitting panel, such as a glass panel.

[0039] Furthermore, based on cost considerations, the first infrared receiving sensor and the second infrared receiving sensor are both thermopile infrared detectors. Of course, the first infrared receiving sensor and the second infrared receiving sensor can also be infrared photoelectric detectors.

[0040] Among them, heating stoves include induction cookers, electric ceramic stoves, etc.

[0041] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 A schematic structural diagram of a heating furnace according to an embodiment of the present application is shown;

[0044] Figure 2 Another structural schematic diagram of a heating furnace according to an embodiment of the present application is shown;

[0045] Figure 3 A schematic diagram showing the structure of an infrared component of a heating stove according to an embodiment of the present application is shown;

[0046] Figure 4 A third structural schematic diagram of a heating furnace according to an embodiment of the present application is shown;

[0047] Figure 5 A fourth structural schematic diagram of a heating furnace according to an embodiment of the present application is shown.

[0048] in, Figures 1 to 5 The corresponding relationship between the reference numerals and the component names is as follows:

[0049] 1 bottom shell, 2 panel, 22 through hole, 3 light-transmitting sheet, 42 first infrared receiving sensor, 44 second infrared receiving sensor, 46 third infrared transmitting sensor, 48 fourth infrared receiving sensor, 5 metal plate, 6 pot, 7 signal collection device, 8 first air duct, 9 infrared receiving angle, 10 heating device. DETAILED DESCRIPTION

[0050] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0051] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0052] Refer to the following Figures 1 to 5 A heating stove provided according to some embodiments of the present application is described.

[0053] like Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of the first aspect of the present application provides a heating stove, including a panel 2, a bottom shell 1, a light-transmitting sheet 3, a first infrared receiving sensor 42 and a second infrared receiving sensor 44.

[0054] The panel 2 is mounted on the bottom shell 1 to form a receiving cavity with the bottom shell 1. The panel 2 is provided with at least one through hole 22, and the panel 2 is used to carry the pot 6. The light-transmitting sheet 3 is arranged in the through hole 22. The first infrared receiving sensor 42 is located in the receiving cavity and is used to receive infrared light in the first target band. The second infrared receiving sensor 44 is located in the receiving cavity and is used to receive infrared light in the second target band.

[0055] The heating stove provided by the present application includes a panel 2, a bottom shell 1, a light-transmitting sheet 3, a first infrared receiving sensor 42 and a second infrared receiving sensor 44. The panel 2 is used to carry the pot 6. The panel 2 and the bottom shell 1 form a shell structure of the heating stove. The shell structure is used to accommodate the first infrared receiving sensor 42, the second infrared receiving sensor 44, the heating coil, the control device and other parts. The light-transmitting sheet 3 is light-transmitting, so that the infrared rays generated by the pot 6 can pass through the light-transmitting sheet 3 and be received by the infrared sensor, so that the temperature of the pot 6 can be determined by the received infrared light, so that the non-contact temperature measurement of the pot 6 can be realized. In view of the good light transmittance of the light-transmitting sheet 3, the infrared rays are less attenuated after passing through the light-transmitting sheet 3, so that the infrared receiving sensor can receive a stronger infrared signal, so that when the temperature of the pot 6 is determined by the signal, the accuracy of the determined temperature of the pot 6 can be improved.

[0056] Among them, for different heating objects, the temperature of the heating objects is different, and the wavelength band of the infrared rays generated is also different. When the pot 6 is working, its temperature is generally high, so the wavelength of the infrared rays it generates is generally short, while the temperature of the panel 2 and the like is low, so the wavelength of the infrared rays it generates is generally long. Therefore, based on this principle, the present application sets two infrared receiving sensors that can receive infrared light of different wavelengths. Among them, the first infrared receiving sensor 42 is used to receive infrared light within the first target band, and the first target band corresponds to the band of infrared light reflected by the pot 6, that is, the first infrared receiving sensor 42 is used to receive infrared light from the pot 6. The second infrared receiving sensor 44 is suitable for receiving infrared light within the second target band, generally infrared light from the panel 2, the coil disk, etc., that is, the second infrared receiving sensor 44 is used to receive infrared rays from objects other than the pot 6. Thereafter, the temperature of the pot 6 can be determined based on the infrared light received by the first infrared receiving sensor 42 and the infrared light received by the second infrared receiving sensor 44.

[0057] In a possible design, the heating stove further includes a control device for determining the temperature of the pot according to the infrared light received by the first infrared receiving sensor 42 and the infrared light received by the second infrared receiving sensor 44. Specifically, the temperature of the pot 6 can be determined according to the infrared light received by the first infrared receiving sensor 42, and then the temperature of the pot 6 can be calibrated according to the infrared light received by the second infrared receiving sensor 44, so that non-contact temperature measurement of the pot 6 can be achieved.

[0058] In addition, since this structure only sets part of the panel 2 as the light-transmitting sheet 3 instead of setting the entire panel 2 as a light-transmitting structure, the cost of the panel 2 is reduced.

[0059] In a possible design, the first target band is adapted to the band of the red line from the pot 6. The first target band is 3μm-4.5μm. According to the temperature at which the pot 6 is heated, the band of infrared rays generally generated by it is less than 5μm, generally 3μm-4.5μm. Therefore, the first target band is set to 3μm-4.5μm, so that the band range of infrared rays that the first infrared receiving sensor 42 can receive is consistent with the band range of infrared rays from the pot 6, so that the infrared rays received by the first infrared receiving sensor 42 can be used as infrared rays from the pot 6, so that the temperature of the pot 6 can be predicted based on the infrared rays, thereby realizing non-contact temperature measurement of the pot 6.

[0060] In a possible design, the second target band is 5 μm-15 μm, which corresponds to the wavelength of infrared rays generated by the panel 2, etc., so that infrared rays from objects other than the pot 6 can be accurately received by the second infrared receiving sensor.

[0061] In a possible design, the heating furnace further includes a fan assembly (not shown in the figure). The fan assembly is located in the accommodating cavity and is used to dissipate heat from the light-transmitting sheet 3 .

[0062] When performing non-contact infrared temperature measurement on the pot 6, since the actual demand is to test the temperature of the pot 6, if the temperature of the panel 2 is too high, it will interfere with the detected radiation intensity of the pot 6. Based on this, the present application specifically sets up a fan assembly, which is used to make the air flow, so that the fan assembly can blow cold air to the light-transmitting plate and / or the panel 2, thereby achieving heat dissipation of the light-transmitting plate and / or the panel 2, thereby reducing the interference of the heat of the light-transmitting plate and / or the panel 2 on the detected radiation intensity of the pot 6, making the temperature measurement of the pot 6 more accurate.

[0063] Furthermore, the panel 2 is a light-transmitting panel, such as a black crystal glass panel. The light transmittance of the panel 2 can be set to be fully transparent or partially transparent as required.

[0064] In one possible design, the first infrared receiving sensor 42 includes an infrared receiving range, the transparent sheet 3 is at least partially located within the infrared receiving range, and the area of ​​the panel 2 corresponding to the infrared receiving range is the first area, the area of ​​the first area is S, and the area overlapping the transparent sheet 3 and the first area is greater than or equal to S / 5.

[0065] In this embodiment, the angle at which the first infrared receiving sensor 42 can receive infrared is determined. Therefore, the range of the panel 2 corresponding to the infrared receiving sensor 42 that can receive infrared rays is the infrared receiving range. The area of ​​the panel 2 corresponding to this range is the first area, and the infrared light passing through the first area can be received by the first infrared receiving sensor 42. The infrared light outside the first area can basically not be received by the first infrared receiving sensor 42. The first area is the effective lighting area of ​​the first infrared receiving sensor 42. The through hole 22 is set in the first area, so that after the light-transmitting sheet 3 is installed at the through hole 22, it can be ensured that the light of the light-transmitting sheet 3 can be received by the first infrared receiving sensor 42. At the same time, in order to ensure that the infrared rays from the pot 6 can be received by the first infrared receiving sensor 42 as much as possible, that is, in order to increase the strength of the signal received by the first infrared receiving sensor 42, the area of ​​the through hole 22 and the light-transmitting sheet 3 can be set larger, generally speaking, not less than S / 5.

[0066] In one possible design, Figure 1 As shown, the first infrared receiving sensor 42 includes an infrared receiving angle 9, and the two sides of the infrared receiving angle 9 intersect with the inner plate surface of the panel 2 at points A and B. The area formed by points A and B as the diameter is the first area; the area where the through hole 22 overlaps with the first area is greater than or equal to (d×d×π / 4) / 5.

[0067] In one possible design, Figure 1 As shown, the through hole 22 is a circular hole, the light-transmitting sheet 3 is a circular sheet, and the diameter of the through hole 22 is the distance between point A and point B.

[0068] This arrangement can ensure that the range of the light-transmitting sheet 3 is basically consistent with that of the first area, so that the infrared rays passing through the light-transmitting sheet 3 can be received more by the first infrared receiving sensor 42, thereby ensuring the strength of the infrared signal received by the first infrared receiving sensor 42, thereby ensuring the accuracy of the temperature of the cookware 6 calculated based on infrared temperature measurement.

[0069] In a possible design, the shape of the light-transmitting sheet 3 includes at least one of a circle, a square, a dot matrix or a polygon. The shape of the light-transmitting sheet 3 can be set arbitrarily according to actual needs, but it is necessary to ensure that the overlapping area of ​​the light-transmitting sheet 3 and the light-sensitive range of the first infrared receiving sensor 42 is not too low, otherwise the intensity of the infrared signal received by the first infrared receiving sensor 42 cannot be ensured.

[0070] In a possible design, the light-transmitting sheet 3 is a zinc selenide piece. That is, the light-transmitting sheet 3 is made of zinc selenide. Zinc selenide has good light transmittance and can reduce the attenuation of infrared rays, thereby ensuring that the infrared rays from the pot 6 can pass through the light-transmitting sheet 3 and be received by the first infrared receiving sensor 42.

[0071] In a possible design, the heating stove further includes: a pot detection unit, which can cooperate with the pot 6 to generate detection parameters.

[0072] The existing heating stove with infrared non-contact temperature measurement cannot determine whether the pot 6 exists. As long as the heating stove starts heating, it will heat up regardless of whether there is a pot 6 on the panel 2. However, heating when there is no pot 6 on the panel 2 not only wastes electricity, but also is dangerous. The pot detection unit can detect whether the pot 6 exists, so that heating can be performed only when it is detected that there is a pot 6 on the panel 2. When there is no pot 6 on the panel 2, the product is controlled not to heat up, or whether to continue heating is determined based on whether the user is away. This can not only improve energy utilization, but also reduce safety hazards caused by empty burning of the product.

[0073] In one possible design, Figure 4 As shown, the heating stove also includes: a third infrared transmitting sensor 46, which is used to emit infrared light in a third target band; a fourth infrared receiving sensor 48, which is used to receive an infrared light reflection signal after the infrared light in the third target band is reflected by the pot 6, and the infrared light reflection signal is used to determine the color of the pot 6 and / or whether the pot 6 exists.

[0074] In this embodiment, the third infrared transmitting sensor 46 and the fourth infrared receiving sensor 48 form an infrared pair sensor, through which the presence of the pot 6 can be detected. The reason is that the infrared light reflection signal strength of the infrared light of the third target band after being reflected by the pot 6 is different when there is a pot and when there is no pot, and the presence of the pot 6 on the panel 2 can be determined based on the signal strength.

[0075] In addition, the third infrared transmitting sensor 46 and the fourth infrared receiving sensor 48 form an infrared pair sensor, through which the color of the pot 6 can be detected. The reason is that different colors of pots 6 reflect infrared rays differently, so the infrared light reflection signal intensity of the infrared light of the third target band after being reflected by pots 6 of different colors is different, and the color of the pot 6 can be determined according to the signal intensity. Considering that the infrared rays generated by pots 6 of different colors after being heated are also different, after the color of the pot 6 is determined, the temperature of the pot 6 can be corrected according to the color of the pot 6.

[0076] In one possible design, Figure 5 As shown, the heating stove also includes a metal plate 5, which is located in the accommodating cavity and is arranged on the panel 2. The capacitance of the metal plate 5 can change according to whether the pot 6 exists; the signal acquisition device 7 is connected to the metal plate 5 and is used to collect the capacitance of the metal plate 5.

[0077] In this embodiment, the capacitance of the metal plate 5 is different when there is a pot and when there is no pot. Therefore, by detecting the capacitance of the metal plate 5, it is possible to simply and conveniently determine whether there is a pot 6 on the panel 2. The signal acquisition device 7 is specifically used to detect the capacitance of the metal plate 5, and the signal collected by the signal acquisition device 7 can be used to determine whether there is a pot 6 on the panel 2.

[0078] In one possible design, Figures 1 to 3 As shown, the inner diameter of the through hole 22 is consistent along the thickness direction of the panel 2; and / or the thickness of the light-transmitting sheet 3 and / or the axial length of the through hole 22 is equal to the thickness of the panel 2.

[0079] Furthermore, the thickness of the light-transmitting sheet 3 and / or the axial length of the through hole 22 is equal to the thickness of the panel 2, that is, the entire thickness of the panel 2 is consistent, and the front side of the light-transmitting sheet 3 is flush or substantially flush with the front side of the panel 2, and the back side of the light-transmitting sheet 3 is also flush or substantially flush with the back side of the panel 2, that is, the axial length of the through hole 22 and the thickness of the panel 2 are consistent or substantially consistent, and the light-transmitting sheet 3 is arranged in the through hole 22, not located on the end face of the through hole 22, that is, the light-transmitting sheet 3 occupies the position of the through hole 22, and the through hole 22 is not a stepped hole, but the inner diameter of the through hole 22 is consistent along the thickness direction of the panel 2, that is, the inner diameter of the through hole 22 is constant and consistent in the axial direction of the through hole 22.

[0080] In a possible design, the heating stove further includes a heating device 10, such as a heating coil. The heating device 10 is located in the accommodating cavity and is used to heat the pot 6. The heating device 10 may be an electromagnetic heating coil, and its specific principle is: the heating coil generates an alternating electromagnetic field, and the pot 6 in the alternating electromagnetic field generates eddy currents inside due to electromagnetic induction, thereby forming active heating, thereby achieving electromagnetic heating of the pot 6.

[0081] In a possible design, the heating furnace further includes a light guide channel, one end of which is sealed and connected to the panel 2. The first infrared receiving sensor 42 is located in the light guide channel, so that the influence of infrared rays from the panel 2 and the like on the detection result of the first infrared receiving sensor 42 can be reduced.

[0082] In any of the above embodiments, the bottom shell 1 is provided with an air inlet and an air outlet, the air inlet and the air outlet are connected through an air duct, and the fan assembly is arranged in the air duct. The wind in the air duct passes through the light-transmitting sheet 3. In this way, the wind passing through the air duct can dissipate heat from the light-transmitting sheet 3. Specifically, the air duct includes a first air duct 8, and the wind in the first air duct 8 passes through the light-transmitting sheet 3, and can dissipate heat from the light-transmitting sheet 3. The first infrared receiving sensor 42 and the like are installed in the first air duct 8.

[0083] In one possible design, the fan assembly is a centrifugal fan, and the projections of the fan assembly and the infrared temperature measurement module composed of multiple infrared sensors on the panel 2 do not overlap; or the fan assembly is located on the side of the infrared temperature measurement module away from the panel 2, and the projections of the fan assembly and the infrared temperature measurement module on the panel 2 at least partially overlap, and the fan assembly is an axial flow fan.

[0084] In this embodiment, the fan assembly can be a centrifugal fan or an axial flow fan, and the centrifugal fan needs to be arranged on the left and right sides of the infrared temperature measurement module, that is, the two need to be arranged horizontally, so the projections of the fan assembly and the infrared temperature measurement module on the panel 2 do not overlap, thereby reducing the overall thickness of the product. The axial flow fan needs to be arranged on the lower side of the infrared temperature measurement module, so the projections of the fan assembly and the infrared temperature measurement module on the panel 2 at least partially overlap, that is, the two need to be arranged vertically, thereby reducing the overall width of the product, but the thickness will be relatively increased. Therefore, the form of the fan assembly can be flexibly selected according to actual needs during the actual production process, and is not limited to centrifugal fans or axial flow fans.

[0085] In a possible design, the panel 2 is generally a light-transmitting panel, such as a glass panel.

[0086] Furthermore, based on cost considerations, the first infrared receiving sensor 42 and the second infrared receiving sensor 44 are both thermopile infrared detectors. Of course, the first infrared receiving sensor 42 and the second infrared receiving sensor 44 can also be infrared photoelectric detectors.

[0087] Among them, heating stoves include induction cookers, electric ceramic stoves, etc.

[0088] The following uses an induction cooker / stove as an example to further introduce the heating stove in the present application.

[0089] Induction cookers / ranges use coils to generate alternating electromagnetic fields to heat the pots. The coils and cooking utensils are physically separated by a glass panel, so infrared temperature measurement can be used without destroying the glass panel structure. However, infrared temperature measurement on induction cookers has the following problems:

[0090] The infrared rays of the cookware are attenuated after passing through the glass, so the signal is strong in the high temperature section and the temperature measurement is accurate. When the temperature is lower than 120℃, the infrared signal intensity generated by the cookware in the low temperature section is low, and the signal is attenuated again after passing through the microcrystalline panel. The signal received by the infrared temperature sensor is very weak, and the temperature measurement accuracy is poor or accurate temperature measurement cannot be achieved.

[0091] The embodiment of the present application proposes a solution for measuring the temperature of an infrared furnace:

[0092] like Figures 1 to 3As shown, the infrared oven includes: a panel 2, an infrared transparent sheet 3, an infrared temperature sensor, an infrared sensor heat dissipation duct, a pot 6, and an infrared receiving angle 9.

[0093] Among them, the infrared transparent sheet 3 is an infrared transparent material (such as zinc selenide, but not limited to this material), the purpose of which is to increase the transmittance of infrared red rays. The cookware 6 can also penetrate the infrared transparent sheet 3 under the condition of weak infrared signals in the low temperature range, and it is assembled with the panel 2 in an inlaid manner.

[0094] The diameter of the infrared transparent sheet 3 depends on the receiving angle of the infrared sensor. The diameter is determined by taking the infrared sensor as the starting point, connecting the edge points of the air duct respectively, and extending it to intersect with the panel 2 at points A and B. The distance between AB is the diameter of the infrared transparent material.

[0095] The diameter of the circle determined by points AB is d, and the radius is (1 / 2)×d. The area of ​​this circular infrared transparent material is d×d×π / 4. This area is the effective receiving area of ​​the infrared sensor determined by the receiving angle and the wind duct. The size and shape of the infrared transparent sheet 3 can be circular, square, dot matrix or other polygons, but the effective area must not be less than (d×d×π / 4) / 5.

[0096] The air duct is used to guide the wind from the electromagnetic cooker fan or the sensor module fan to the sensor and the panel 2, respectively dissipating the heat of the sensor and the panel 2 to prevent excessive temperature rise.

[0097] The infrared sensor module includes 4 sensors, including 3μm-4.5μm wavelength sensor, 5μm-15μm wavelength sensor, 940nm infrared transmitting tube, and 940nm infrared receiving tube. When all 4 sensors are present, the infrared transparent sheet 3 transmits infrared with a wavelength less than 5um. At this time, the 3μm-4.5μm wavelength sensor receives the 3-4.5um infrared temperature measurement generated by the pot 6, and the 5μm-15μm wavelength sensor receives the 5-15um infrared generated by glass, wire coils, etc. for temperature calibration. The 940nm infrared transmitting tube emits 940nm infrared, which is reflected by the pot 6 and received by the 940nm infrared receiving tube. Since the reflection of pots 6 of different colors is different, it is used to judge the color of the pot 6 and calibrate the infrared temperature measurement.

[0098] This embodiment is an infrared transmission scheme in which a hole is opened in the middle of the glass panel 2 and a light-transmitting sheet 3 is embedded. According to the infrared sensor acceptance angle, a hole of corresponding area is opened on the glass panel 2, and the hole is filled with a light-transmitting sheet 3 of infrared-transmitting material, thereby increasing the temperature transmittance in the low temperature range. The waveband of the light-transmitting sheet 3 is selected to be a certain range within the interval of 1μm-5μm, for example, 3μm-4.5μm or 1μm-3μm can be selected. In order to reduce the infrared interference radiated by the glass panel 2, the air duct is designed to increase the proportion of the signal of the pot 6 in the total infrared signal, thereby reducing the interference.

[0099] In addition, the infrared oven uses a heating wire to generate infrared radiation to heat the pot 6, which has the advantage of not being picky about the material of the pot 6, and can heat both metal pots 6 and ceramic pots 6. However, the infrared oven currently has the following problems: it cannot judge the pot, and as long as the heating function is turned on, it will heat regardless of whether there is a pot 6 on the panel 2. When there is no pot 6, heating is not only a waste of electricity, but also dangerous. Therefore, the scheme proposes a method for the infrared oven to judge whether there is a pot 6 on the panel 2, and only heats it when it is judged that there is a pot 6.

[0100] The embodiment of the present application proposes a solution for an infrared oven to determine whether a pot 6 exists:

[0101] Among them, Figure 4 As shown, the infrared stove includes the following structure: infrared heating wire, infrared stove panel 2, pot 6, 940nm infrared pair tube, and light emitted by the infrared transmitting tube, wherein the light reflected by the pot 6 is received by the 940nm infrared receiving tube.

[0102] Among them, a 940nm infrared pair tube is installed at the bottom of the infrared furnace heating wire, including an infrared transmitting tube and an infrared receiving tube. During the operation of the infrared furnace, the infrared transmitting tube emits infrared light with a wavelength of 940nm, and the light reflected by the pot 6 is received by the infrared receiving tube. Thereafter, the presence or absence of the pot 6 can be judged according to the strength of the received signal. Specifically, when there is no pot 6, there is no light reflection phenomenon, and the infrared receiving tube signal is 0 or less than the set threshold. When there is a pot 6, there is light reflection, and the infrared receiving tube signal is higher than the set threshold.

[0103] After the heating function is started, the pot 6 is detected. When the pot 6 is detected, heating is performed. Real-time detection is performed during the working process. If it is detected that the pot 6 is taken away, heating is stopped.

[0104] Furthermore, a sleeve is designed around the infrared tube, and the sleeve is fitted with the panel 2 to avoid infrared interference emitted by the infrared disk.

[0105] For example, when a certain infrared oven is tested, the test results are as follows: when there is no pot, the infrared receiving tube signal is only an infrared signal weakly reflected by the glass. At this time, the signal AD value is sampled, and the signal strength is less than 200. When a black pot 6 is placed on the panel 2, the signal strength is greater than 800, and when a silver Yageo pot is placed, the signal strength is greater than 1400.

[0106] The embodiment of the present application also proposes another solution for the infrared oven to determine whether the pot 6 is present.

[0107] like Figure 5 As shown, the infrared oven includes a pot 6, a panel 2, a heating wire, a metal sheet and a signal processing device.

[0108] The metal sheet is tightly attached to the glass panel 2 through an elastic device and is connected to the signal acquisition microcontroller. When the pot 6 is placed, the pot 6 and the metal sheet form a capacitance detection sensor, and the capacitance of the metal sheet is greater than the set threshold. When the pot is empty, the capacitance threshold is less than the set value. That is, in the actual process, the capacitance of the metal sheet under the panel 2 can be used to detect whether the pot 6 exists.

[0109] After the heating function is started, the pot 6 is detected. When the pot 6 is detected, heating is performed. Real-time detection is performed during the working process. If it is detected that the pot 6 is taken away, heating is stopped.

[0110] In this application, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0111] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heating furnace, characterized in that: include: Bottom shell; A panel is mounted on the bottom shell and forms a receiving cavity with the bottom shell. The panel is provided with at least one through hole and is used to carry the cookware. A light-transmitting sheet, arranged in the through hole; A first infrared receiving sensor, located in the accommodating cavity, for receiving infrared light in a first target band; A second infrared receiving sensor, located in the accommodating cavity, for receiving infrared light in a second target band; The temperature of the pot can be determined by the infrared light received by the first infrared receiving sensor and the infrared light received by the second infrared receiving sensor.

2. The heating furnace according to claim 1, characterized in that: The first target wavelength range is 3 μm-4.5 μm; and / or The second target waveband is 5 μm-15 μm.

3. The heating furnace according to claim 1, characterized in that: Also includes: A fan assembly is located in the accommodating cavity and is used to dissipate heat from the light-transmitting sheet.

4. The heating furnace according to claim 1, characterized in that: The first infrared receiving sensor includes an infrared receiving range, the transparent sheet is at least partially located within the infrared receiving range, and the area of ​​the panel corresponding to the infrared receiving range is the first area, the area of ​​the first area is S, and the area of ​​the light-transmitting sheet overlapping the first area is greater than or equal to S / 5.

5. The heating furnace according to claim 4, characterized in that: The first infrared receiving sensor includes an infrared receiving angle, two sides of which intersect with the inner surface of the panel at points A and B, the through hole is a circular hole, the light-transmitting sheet is a circular sheet, and the diameter of the through hole is equal to the distance between point A and point B.

6. The heating furnace according to claim 1, characterized in that: The shape of the light-transmitting sheet includes at least one of a circle, a square, a dot matrix or a polygon.

7. The heating furnace according to claim 1, characterized in that: Also includes: The light-transmitting sheet is a zinc selenide piece.

8. The heating furnace according to any one of claims 1 to 7, characterized in that: Also includes: A third infrared emission sensor, used for emitting infrared light of a third target band; The fourth infrared receiving sensor is used to receive an infrared light reflection signal after the infrared light in the third target band is reflected by the cookware, and the infrared light reflection signal is used to determine the color of the cookware and / or whether the cookware exists.

9. The heating furnace according to any one of claims 1 to 7, characterized in that: Also includes: A metal plate, located in the accommodating cavity and arranged on the panel, wherein the capacitance of the metal plate can be changed according to whether the pot is present; A signal acquisition device is connected to the metal plate and is used to acquire the capacitance value of the metal plate.

10. The heating furnace according to any one of claims 1 to 7, characterized in that: The inner diameter of the through hole is consistent along the thickness direction of the panel; and / or The thickness of the light-transmitting sheet and / or the axial length of the through hole is equal to the thickness of the panel.

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