Infrared temperature measuring device and gas stove using the same

Abstract

The present invention relates to an infrared temperature measuring device and a gas stove using the infrared temperature measuring device, wherein the infrared temperature measuring device includes an infrared temperature measuring sensor for measuring temperature, and is characterized in that: it also includes a shell, the infrared temperature measuring sensor is installed in the shell, a transmission hole is opened on the surface of the shell, an anti-fouling sheet capable of transmitting infrared light is arranged in the transmission hole, a detection channel connected to the transmission hole is arranged in the shell, and the infrared temperature measuring sensor is arranged in the detection channel; the detection channel is straight and has an angle α with the horizontal plane, 18°<α<23°; a collimator is also arranged in the detection channel, which is located in front of the infrared temperature measuring sensor and is used to increase the measuring distance of the infrared temperature measuring sensor. Compared with the prior art, the present invention does not need to open a hole in the inner ring of the burner, can reduce most of the flame radiation interference, and ensure that the infrared temperature measuring sensor can still have a stable measurement result and a relatively accurate test accuracy under the condition of flame interference.

Description

Technical Field

[0001] The invention relates to an infrared temperature measuring device and a gas stove using the infrared temperature measuring device. Background Art

[0002] With the improvement of people's living standards, household gas stoves have gradually become popular in my country. Excessive combustion of household gas stoves will damage the heated pots and food and may cause fires, which is a major hidden danger to kitchen safety.

[0003] As users have higher and higher requirements for cooking experience, intelligent control and cooking safety, how to accurately measure the temperature of food in the pot, further prevent food from burning dry, and realize the intelligent reminder function of intelligent recipes is an important research direction now.

[0004] The existing methods for measuring the temperature of food in gas stove pots mainly include: NTC temperature measurement at the bottom of the pot, infrared temperature measurement at the bottom of the pot, temperature measurement in the form of probes, etc.

[0005] NTC temperature measurement of the pot bottom requires changing the structure of the burner and opening a hole in the inner ring, which can easily lead to uneven temperature at the pot bottom; interference from high-temperature smoke and flames in the inner ring will also affect the temperature measurement accuracy; and the cookware has poor adaptability, such as pots with concave bottoms and ceramic pots, which will affect the temperature measurement accuracy; infrared temperature measurement of the pot bottom still needs to be in contact with the pot bottom, which also requires changing the structure of the burner and opening a hole in the inner ring of the burner, and the lens is easily affected by oil pollution. Long-term practical use can easily lead to inaccurate temperature measurement results, and the high-temperature smoke and flames at the bottom of the pot can also easily affect the temperature measurement accuracy. Summary of the invention

[0006] The primary technical problem to be solved by the present invention is to provide a low-cost infrared temperature measuring device that does not require changing the burner structure in view of the above-mentioned prior art.

[0007] A further technical problem to be solved by the present invention is to provide a gas stove using the infrared temperature measuring device according to the above-mentioned prior art.

[0008] The technical solution adopted by the present invention to solve the above-mentioned primary technical problem is: an infrared temperature measuring device, including an infrared temperature measuring sensor for measuring temperature, characterized in that: it also includes a shell, the infrared temperature measuring sensor is installed in the shell, a transmission hole is opened on the surface of the shell, an anti-fouling sheet that can transmit infrared light is provided in the transmission hole, a detection channel connected to the transmission hole is provided in the shell, and the infrared temperature measuring sensor is arranged in the detection channel; the detection channel is straight and has an angle α with the horizontal plane, 18°<α<23°; the detection channel is also provided with a collimator located in front of the infrared temperature measuring sensor for increasing the measuring distance of the infrared temperature measuring sensor.

[0009] As an improvement, the inner wall of the detection channel is provided with a black coating.

[0010] As a further improvement, there is a gap of 10 mm to 15 mm between the infrared temperature sensor and the collimating mirror.

[0011] As a further improvement, a cookware emissivity measurement module is further provided in the shell, and the cookware emissivity measurement module includes an infrared LED transmitting tube and an infrared LED receiving tube that are arranged in pairs, and a reflectivity calculation module electrically connected to the infrared LED transmitting tube and the infrared LED receiving tube.

[0012] Further improvement, the shell is provided with a first mounting hole for installing the infrared LED transmitting tube and a second mounting hole for installing the infrared LED receiving tube, the first mounting hole and the second mounting hole are arranged on the same side of the transmission hole; the outer surfaces of the first mounting hole and the second mounting hole are provided with anti-fouling glass; the setting direction of the first mounting hole satisfies that the measuring point of the infrared LED transmitting tube falls on the outer wall of the object to be measured, and the installation direction of the second mounting hole satisfies that the infrared LED receiving tube can receive the infrared light emitted by the infrared LED transmitting tube and reflected back by the object to be measured.

[0013] Further improvement, a first reflective cup with a parabolic inner wall is provided in the first mounting hole, and the infrared LED transmitting tube is located at the focus of the parabola on the inner wall of the first reflective cup; a second reflective cup with a parabolic inner wall is provided in the second mounting hole, and the infrared LED receiving tube is located at the focus of the parabola on the inner wall of the second reflective cup.

[0014] As a further improvement, an angle α is formed between the installation directions of the lens of the infrared LED transmitting tube and the lens of the infrared LED receiving tube and the horizontal plane, and 18°<α<23°.

[0015] Further improvement, the shell also includes a temperature calculation module connected to the infrared temperature sensor and the reflectivity calculation module. The temperature calculation module calculates the emissivity ε=1-β of the pot body according to the radiation energy P(T) received by the infrared temperature sensor and the reaction rate β of the pot body calculated by the reflectivity calculation module, and then calculates the emissivity ε=1-β of the pot body according to P(T)=εσT 4 , calculate the real-time absolute temperature of the bottom of the pot under test, where T is the absolute temperature of the outer wall of the pot under test, and σ is the Stefan-Boltzmann constant.

[0016] As a further improvement, the shell is in the shape of a cuboid or a cube, and anti-fouling eaves are provided around the top of the shell.

[0017] The technical solution adopted by the present invention to solve the above-mentioned further technical problems is: a gas stove using an infrared temperature measuring device of the above-mentioned structure, including a left burner and a right burner, characterized in that: the infrared temperature measuring device is arranged as a whole behind the center line of the left burner and the right burner, and is 250mm to 300mm away from the left burner or the right burner; the transmission hole is aligned in the direction of the left burner or the right burner.

[0018] Compared with the prior art, the advantages of the present invention are: no need to open holes in the inner ring of the burner, no impact on the structure and flue gas efficiency of the burner, and the ability to reduce most of the flame radiation interference, ensuring that the infrared temperature sensor can still have stable measurement results and relatively accurate test accuracy under flame interference conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the infrared temperature measuring device in an embodiment of the present invention.

[0020] Figure 2 for Figure 1 AA section view.

[0021] Figure 3 for Figure 1 Middle BB section view.

[0022] Figure 4 Schematic diagram of the structure of a gas stove in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 , 2 The infrared temperature measuring device shown in 3 comprises a shell 2 which is roughly in the shape of a cube. Anti-fouling eaves 26 are arranged around the top of the shell 2. An infrared temperature sensor 1 for measuring temperature is arranged in the shell 2. A transmission hole 21 is opened on one side of the shell. An anti-fouling sheet 3 capable of transmitting infrared light is arranged in the transmission hole 21. A detection channel 22 connected with the transmission hole 21 is arranged in the shell 2. The infrared temperature sensor 1 is arranged inside the detection channel 22. The detection channel 22 is straight and has an angle α with the horizontal plane, 18°<α<23°; a collimator 4 is also arranged in the detection channel 22, which is located in front of the infrared temperature sensor 1 and is used to increase the measuring distance of the infrared temperature sensor 1.

[0025] In this embodiment, the collimator 4 adopts a Fresnel lens made of high-density polyethylene with high transmittance in the 5-10um band (this band can better avoid the highest flame radiation) and low cost. The function of the collimator 4 can enable the infrared temperature sensor 1 to have long-distance measurement capability and can reduce most of the flame radiation interference, thereby ensuring that the infrared temperature sensor 1 can still have stable measurement results and relatively accurate test accuracy under flame interference conditions.

[0026] The infrared temperature sensor 1 adopts a B-type sensor. There is a 12 mm gap between the infrared temperature sensor 1 and the collimating mirror 4, which can effectively reduce the field of view angle. In addition, the inner wall of the detection channel 22 is provided with a black coating 221, which can prevent the reflected radiation interference of the detection channel 22 itself and affect the temperature measurement accuracy of the infrared temperature sensor 1.

[0027] In addition, a cookware emissivity measurement module is also provided in the housing 2, and the cookware emissivity measurement module includes an infrared LED transmitting tube 5 and an infrared LED receiving tube 6 that are arranged in pairs, and a reflectivity calculation module 7 that is electrically connected to the infrared LED transmitting tube 5 and the infrared LED receiving tube 6, and the calculation principle and calculation method of the reflectivity calculation module 7 are conventional technologies. The housing 2 is provided with a first mounting hole 23 for mounting the infrared LED transmitting tube 5 and a second mounting hole 24 for mounting the infrared LED receiving tube 6, and the first mounting hole 34 and the second mounting hole 24 are arranged on the same side of the transmission hole 21; the outer surfaces of the first mounting hole 34 and the second mounting hole 24 are provided with anti-fouling glass 25; the setting direction of the first mounting hole satisfies that the measurement point of the infrared LED transmitting tube 5 falls on the outer wall of the object to be measured, and the installation direction of the second mounting hole satisfies that the infrared LED receiving tube 6 can receive the infrared light emitted from the infrared LED transmitting tube 5 and reflected back by the outer wall of the object to be measured. A first reflective cup 9 with a parabolic inner wall is provided in the first mounting hole, and the infrared LED transmitting tube 5 is located at the focus of the parabolic inner wall of the first reflective cup 9; a second reflective cup 8 with a parabolic inner wall is provided in the second mounting hole, and the infrared LED receiving tube 6 is located at the focus of the parabolic inner wall of the second reflective cup 8. The lens installation directions of the infrared LED transmitting tube 5 and the infrared LED receiving tube 6 have an angle α with the horizontal plane, 18°<α<23°.

[0028] In the actual test process, since the emission radiation direction characteristic of the surface of the main metal pot (such as a black pot) is diffuse reflection, if the power of the selected infrared LED transmitting tube is small, the emitted light is relatively scattered, and it is difficult to distinguish between the black pot with high emissivity and the two situations where there is no pot on the stove (the received radiation energy is too little). In the present invention, the infrared LED transmitting tube 5 and the infrared LED receiving tube 6 are placed at the parabolic focus of the first reflective cup and the second reflective cup respectively, which can enhance the collimation of the emission and the receiving area of ​​the receiver, thereby effectively solving the problem of insufficient radiation energy and measuring the emissivity of the pot well.

[0029] In addition, the housing also includes a temperature calculation module connected to the infrared temperature sensor and the reflectivity calculation module 7. The temperature calculation module calculates the emissivity ε=1-β of the pot body according to the radiation energy P(T) received by the infrared temperature sensor and the reaction rate β of the pot body calculated by the reflectivity calculation module 7, and then calculates the emissivity ε=1-β of the pot body according to P(T)=εσT 4, calculate the real-time absolute temperature of the bottom of the pot under test, where T is the absolute temperature of the outer wall of the pot under test, and σ is the Stefan-Boltzmann constant.

[0030] Compared with the existing infrared temperature measurement method, the infrared temperature measurement device provided by the present invention is not limited by the installation position, does not need to open holes in the inner ring of the burner, does not need to avoid the burner fire hole to avoid the interference of flame radiation, and has no effect on the initial burner structure.

[0031] like Figure 4 As shown, the infrared temperature measuring device provided by the present invention is directly placed on the gas stove 1, and in terms of the selection of the setting position and angle of the infrared temperature measuring device, measures need to be taken to prevent the liquid in the pot from splashing out, blocking or contaminating the sensor. In particular, when the infrared temperature measuring device is arranged close to the pot, it is necessary to prevent the material in the pot from blocking the observation port of the sensor. The Class B sensor selected by the present invention has a use temperature range of -40°C to 85°C. When using a gas stove, the continuous radiation of the gas flame and the pot may cause the ambient temperature of the sensor to exceed the above temperature range. If the infrared temperature measuring device is installed at a position close to the distance, it may be damaged due to the temperature around the infrared temperature measuring sensor 1 exceeding the specified temperature for use. In addition, the closer the distance, the greater the measurement inclination angle of the infrared temperature measuring sensor 1, and the sensor observation hole is more likely to be contaminated by liquid overflowing from the pot. Taking into account the temperature rise of the sensor and the user usage scenario, the infrared temperature measuring device in the embodiment of the present invention is arranged as a whole behind the center line of the left burner and the right burner, and is 250mm to 300mm away from the left burner or the right burner; the transmission hole 21 is aligned in the direction of the left burner or the right burner, so that the measuring point of the infrared temperature sensor 1 will fall on the pot wall above the bottom of the pot above the burner, and the pot emissivity measurement module can also better measure the reflectivity of the pot.

Claims

1. An infrared temperature measuring device, comprising an infrared temperature measuring sensor (1) for measuring temperature, characterized in that: The invention also comprises a shell (2), wherein the infrared temperature sensor (1) is installed in the shell (2), a transmission hole (21) is provided on the surface of the shell (2), an anti-fouling sheet (3) capable of transmitting infrared light is provided in the transmission hole (21), a detection channel (22) connected to the transmission hole (21) is provided in the shell (2), and the infrared temperature sensor (1) is arranged in the detection channel (22); the detection channel (22) is straight and has an angle α with a horizontal plane, 18°<α<23°; a collimator (4) is also provided in the detection channel (22) and is located in front of the infrared temperature sensor (1) for increasing the measuring distance of the infrared temperature sensor (1); a black coating (221) is provided on the inner wall of the detection channel (22); and a gap of 10m to 15mm is provided between the infrared temperature sensor (1) and the collimator (4).

2. The infrared temperature measuring device according to claim 1, characterized in that: A cookware emissivity measurement module is also provided in the housing, and the cookware emissivity measurement module comprises an infrared LED transmitting tube (5) and an infrared LED receiving tube (6) arranged in pairs, and a reflectivity calculation module (7) electrically connected to the infrared LED transmitting tube (5) and the infrared LED receiving tube (6).

3. The infrared temperature measuring device according to claim 2, characterized in that: The housing (2) is provided with a first mounting hole (23) for mounting an infrared LED transmitting tube (5) and a second mounting hole (24) for mounting an infrared LED receiving tube (6); the first mounting hole (34) and the second mounting hole (24) are arranged on the same side of the transmission hole (21); the outer surfaces of the first mounting hole (34) and the second mounting hole (24) are provided with anti-fouling glass (25); the first mounting hole is arranged in a direction such that the measuring point of the infrared LED transmitting tube (5) falls on the outer wall of the object to be measured, and the second mounting hole is arranged in a direction such that the infrared LED receiving tube (6) can receive infrared light emitted by the infrared LED transmitting tube (5) and reflected back by the outer wall of the object to be measured.

4. The infrared temperature measuring device according to claim 3, characterized in that: A first reflective cup (9) with a parabolic inner wall is provided in the first mounting hole, and the infrared LED transmitting tube (5) is located at the focus of the parabolic inner wall of the first reflective cup (9); a second reflective cup (8) with a parabolic inner wall is provided in the second mounting hole, and the infrared LED receiving tube (6) is located at the focus of the parabolic inner wall of the second reflective cup (8).

5. The infrared temperature measuring device according to claim 4, characterized in that: There is an included angle α between the installation directions of the lens of the infrared LED transmitting tube (5) and the lens of the infrared LED receiving tube (6) and the horizontal plane, and 18°<α<23°.

6. The infrared temperature measuring device according to claim 5, characterized in that: The housing further comprises a temperature calculation module connected to the infrared temperature sensor and the reflectivity calculation module (7). The temperature calculation module calculates the emissivity ε=1-β of the pot body according to the radiation energy P(T) received by the infrared temperature sensor and the reaction rate β of the pot body calculated by the reflectivity calculation module (7). Then, according to P(T)=εσT 4 , calculate the real-time absolute temperature of the bottom of the pot under test, where T is the absolute temperature of the outer wall of the pot under test, and σ is the Stefan-Boltzmann constant.

7. The infrared temperature measuring device according to any one of claims 1 to 6, characterized in that: The shell (2) is in the shape of a cuboid or a cube, and anti-fouling eaves (26) are arranged around the top of the shell.

8. A gas stove using the infrared temperature measuring device according to any one of claims 1 to 6, comprising a left burner and a right burner, characterized in that: The infrared temperature measuring device is integrally arranged behind the center lines of the left burner and the right burner and is 250 mm to 300 mm away from the left burner or the right burner; the transmission hole (21) is aligned in the direction of the left burner or the right burner.

Images