Kitchen temperature measuring sensor

Abstract

The utility model relates to a kitchen temperature measurement sensor, which comprises a sleeve-shaped sensor body, a hollow cavity is arranged in the sensor body, two sets of induction components are symmetrically packaged in the cavity, and each induction component comprises a thermopile chip capable of converting a temperature signal into a thermoelectromotive force signal. The sensor comprises a sensor body and a sensor probe embedded in the sensor body, a filter is arranged in front of the thermopile chip, a light hole is formed in front of the filter, the light hole is formed in the sensor body, and an optical path formed by the light hole is used for infrared rays to pass through; the induction component comprises a sensor signal conditioning chip unit which is electrically connected with the thermopile chip through a gold wire. Two sets of sensor components are arranged in one kitchen temperature measurement sensor, and a dual-channel structure is adopted, so that the product cost is reduced, and the hidden trouble is reduced. The sensor signal conditioning chip unit is used for replacing a traditional analog signal sensor, so that the anti-interference capability is improved, and the circuit design is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature measurement, in particular to a kitchen temperature measurement sensor. Background Art

[0002] As people's living standards continue to improve, people are paying more and more attention to the home environment and indoor air quality. In order to improve the ventilation conditions in the kitchen and exhaust the fumes and exhaust gas generated during cooking, the range hood has become one of the indispensable household appliances in the kitchen.

[0003] The range hood uses infrared temperature measurement on the burner on the stove to automatically control the range hood's power on and off and the air volume linkage according to the cooking situation. The infrared temperature measurement serves as the feedback of the system. The accuracy of the temperature measurement determines the stability and reliability of the range hood's power on and off and the air volume linkage control. Therefore, infrared temperature measurement is particularly important in the entire system.

[0004] Chinese Patent Publication (Announcement) No.: CN205261676U, Patent Title: Infrared Temperature Measurement Range Hood, it discloses that "depending on the different structures of the stove, the number of infrared temperature sensors 2 is different. For example, if the stove is provided with 2 burners and can hold two pots 3, then the range hood is provided with 2 corresponding infrared temperature sensors 2; if the stove is provided with 3 burners and can hold two pots 3, then the range hood is provided with 3 corresponding infrared temperature sensors 2, and so on."

[0005] At present, there are infrared temperature measurement dual-chamber range hood products on the market. The range hood can obtain the temperature data inside the pot through infrared temperature measurement, but because the stove has left and right, the infrared temperature measurement probe inside the range hood is usually set to two to determine which stove is turned on and then turn on the corresponding smoke chamber, and then use the software algorithm to perform scene model analysis to automatically control the range hood, such as automatic power on and off, automatic gear switching, etc. The main defects are:

[0006] Because it is necessary to detect both the left and right pots, two independent infrared temperature measuring probes must be set up, which invisibly increases product costs and potential failure risks.

[0007] Traditional temperature measurement is basically based on analog signal sensors, which have weak anti-interference capabilities and complex circuit design. Summary of the invention

[0008] The purpose of the utility model is to provide a kitchen temperature measuring sensor to solve the problems raised in the above background technology.

[0009] To solve the above technical problems, the present utility model is achieved by the following technical measures: A kitchen temperature measuring sensor, characterized in that: it includes a sleeve-shaped sensor body, a hollow cavity is provided in the sensor body, and two sets of induction components are symmetrically encapsulated in the cavity. The induction components include a thermopile chip capable of converting a temperature signal into a thermal electromotive force signal, and a sensor probe embedded in the sensor body. A filter is provided in front of the thermopile chip, and a light-transmitting hole is provided in front of the filter. The light-transmitting hole is provided on the sensor body, and the formed light path is used to pass infrared rays; the induction components include a sensor signal conditioning chip unit, which is electrically connected to the thermopile chip through a gold wire.

[0010] Compared with the prior art, the advantages of the present utility model are: two sets of sensor components are provided in a kitchen temperature measuring sensor, adopting a dual-channel structure, reducing the product cost and reducing the potential trouble of failure. Using a sensor signal conditioning chip unit to replace the traditional analog signal sensor, improving the anti-interference ability and simplifying the circuit design.

[0011] As an improvement of the present utility model, the position of the filter is set diagonally in front of the thermopile chip. The purpose of choosing this design: Since the set wavelength band of the filter is 7-14um, and the position of the filter is set diagonally in front of the thermopile chip, it can make the filter window have a certain offset from the thermopile, so as to cooperate with the light path design and enable the infrared wave to enter the thermopile chip along the light path.

[0012] As an improvement of the present utility model, the outer shape of the light path is a circular stepped opening type. The purpose of choosing this design: It can more effectively reflect the infrared wave energy outside the field of view angle.

[0013] As an improvement of the present utility model, the design angle of the light path is between 20° and 30°. The purpose of choosing this design: Through the extension and diffusion of the light path, it can effectively cover the entire panorama of the left stove and the right stove.

[0014] As an improvement of the present utility model, the material of the sensor body is selected as brass. The purpose of choosing this design: Brass material can effectively improve the thermal shock ability of the product, thereby reducing the temperature drift of the sensor caused by external temperature influence.

[0015] As an improvement of the present utility model, the surface of the sensor body is treated with black paint. The purpose of choosing this design: It is used to absorb stray infrared light, thereby improving the stability of the sensor. Description of the Drawings

[0016] The attached drawings, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model.

[0017] In the attached drawings:

[0018] Figure 1 It is a schematic structural diagram of the sensor described in the present utility model.

[0019] Figure 2 It is a schematic diagram of the installation on the range hood for detecting the cooking stove described in the present utility model.

[0020] Figure 3 It is a schematic diagram of the internal module principle of the sensor described in the present utility model.

[0021] Figure 4 It is a schematic internal diagram of the sensor described in the present utility model.

[0022] Description of reference numerals: 1. Thermopile chip; 2. Sensor probe; 3. Filter film; 4. Sensor body; 5. Optical path; 6. Gold wire; 7. Sensor signal conditioning chip unit; 8. Left cooking stove; 9. Right cooking stove; 10. Infrared temperature sensor. Detailed implementation manners

[0023] The following describes the preferred embodiments of the present utility model with reference to the attached drawings. It should be understood that the preferred embodiments described herein are only used to explain and illustrate the present utility model and are not used to limit the present utility model.

[0024] Embodiment 1

[0025] Please refer to Figure 1 -4. A kitchen temperature sensor provided in this embodiment includes a sleeve-shaped sensor body 4. A hollow cavity (but not penetrating the sensor body 4) is provided inside the sensor body 4. Two sets of identical induction components are symmetrically encapsulated in the cavity. The induction components include a thermopile chip 1 that can convert a temperature signal into a thermal electromotive force signal. The thermopile chip 1 can convert a temperature signal into a thermal electromotive force signal.

[0026] The induction components further include a sensor probe 2 embedded in the sensor body 4. A filter film 3 is provided in front of the thermopile chip 1. In front of the filter film 3 is a light-transmitting hole, which is provided on the sensor body 4. The formed optical path 5 is used to pass infrared rays. The induction components include a sensor signal conditioning chip unit 7, which is electrically connected to the thermopile chip 1 through a gold wire 6.

[0027] Further, the position of the filter 3 is set diagonally in front of the thermopile chip 1. Since the set wavelength band of the filter 3 is 7 - 14um and the position of the filter 3 is set diagonally in front of the thermopile chip 1, the window of the filter 3 can be staggered from the thermopile to a certain extent, so as to cooperate with the design of the optical path 5, enabling the infrared wave to enter the thermopile chip 1 along the optical path 5.

[0028] Further, the outer shape of the optical path 5 is a circular stepped opening type, and this structure can more effectively reflect the infrared wave energy outside the field of view angle range.

[0029] In the embodiment of the present utility model application, please refer to Figure 2 (the unit in the figure is mm). The design angle of the optical path 5 is 23°, that is, the design angles of the two optical paths 5 on the left and right are 23°. A dual-channel structure is adopted, and a circular stepped opening design is used, which can effectively reflect the infrared wave energy outside the field of view angle range. Taking a range hood with an installation height of 43cm as an example, as Figure 2 is a schematic diagram of the temperature measurement device installed on the range hood to detect the cooking stove. This temperature measurement device is installed directly above the range hood. The center distance between the left cooking stove 8 and the right cooking stove 9 of the cooking stove is 460mm. The height distance from the infrared temperature sensor 10 (i.e., the kitchen temperature sensor or temperature measurement device) to the cooking stove is 430mm, and the diameter of the cooking stove is 250mm. Therefore, this angle is designed to be 23° to ensure that both cooking stoves can be covered.

[0030] Further, the material of the sensor body 4 is selected as brass material, because the brass material can effectively improve the thermal shock ability of the product, thereby reducing the temperature drift of the sensor caused by the influence of the external temperature.

[0031] Further, the surface of the sensor body 4 is treated with black paint to absorb stray infrared light, thereby improving the stability of the sensor.

[0032] In the embodiment of the present utility model application, please refer to Figure 3 , Figure 3 As shown in the schematic diagram of the internal module of the sensor, the infrared wave energy irradiates to the sensor. The main electronic components of the sensor mainly include a filter 3, a thermopile chip 1, and a sensor signal conditioning chip unit 7 (i.e., the signal conditioning chip unit in the figure), etc. Among them, in the embodiment of the present utility model application, there are two filters. For clarity, Figure 3 are marked as filter 1 and filter 2 in Figure 3 . The set infrared filter wavelength band is 7 - 14um. This wavelength band can effectively penetrate air and even water vapor, enabling the sensor to receive the radiation energy of the target object with the maximum energy. There are two thermopile chips, namely thermopile 1 ( Figure 3In (China), it adopts a thermopile chip 1 with low noise and high responsivity to ensure that the sensor can effectively identify the change in the thermal energy of the target object. The sensor also includes a sensor signal conditioning chip unit 7 inside. This unit uses two full-differential channels, with a high-gain amplifier and a high-resolution AD sampling circuit built-in. At the same time, a CMOS temperature sensor is built-in to collect the temperature inside the probe to compensate for the target temperature drift caused by the increase in temperature. The sensor signal conditioning chip unit 7 directly transmits the temperature value to the upper computer controller through the conversion of voltage and temperature, making the circuit design simpler. Figure 4 It is a schematic diagram inside the sensor. Among them, 1 is the thermopile chip, 6 is the gold wire (used for the electrical connection of various electronic components and pins), and 7 is the sensor signal conditioning chip unit.

[0033] The beneficial effects of the present utility model are as follows: Two sets of sensor components are arranged in a kitchen temperature measurement sensor, adopting a dual-channel structure, that is, the detection of a double burner is realized through two thermopile chips 1 integrated inside a sensor. At the same time, the angle of the sensor is restricted through the structure, without using a lens to collect the angle, reducing the product cost and potential failure hazards. The sensor signal conditioning chip unit 7 is used to replace the traditional analog signal sensor, improving the anti-interference ability and simplifying the circuit design.

[0034] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0035] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A kitchen temperature sensor, characterized by: The invention comprises a sleeve-shaped sensor body (4), a hollow cavity is arranged in the sensor body (4), two sets of sensing components are symmetrically encapsulated in the cavity, the sensing components comprise a thermopile chip (1) capable of converting a temperature signal into a thermoelectromotive force signal, and a sensor probe (2) embedded in the sensor body (4), a filter (3) is arranged in front of the thermopile chip (1), a light-transmitting hole is arranged in front of the filter (3), and the light-transmitting hole is arranged on the sensor body (4), and the light path (5) formed by the light-transmitting hole is used to pass infrared rays; the sensing components comprise a sensor signal conditioning chip unit (7), which is electrically connected to the thermopile chip (1) through a gold wire (6).

2. The kitchen temperature sensor according to claim 1, characterized in that: The filter (3) is arranged obliquely in front of the thermopile chip (1).

3. The kitchen temperature sensor according to claim 1, characterized in that: The optical path (5) has a circular stepped opening shape.

4. The kitchen temperature sensor according to claim 1, characterized in that: The design angle of the optical path (5) is between 20° and 30°.

5. The kitchen temperature sensor according to claim 1, characterized in that: The material of the sensor body (4) is brass.

6. The kitchen temperature sensor according to claim 1, characterized in that: The surface of the sensor body (4) is painted black.

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