Temperature sensing device for a range hood

Abstract

The application provides a temperature sensing device for an extractor hood, and relates to the field of intelligent kitchen appliances. The temperature sensing device comprises a copper temperature sensing piece, a heat-conducting copper foil sheet, a thermosensitive element and a circuit board, and the thermosensitive element is electrically connected with the circuit board. One end of the copper temperature sensing piece is used for extending into a space to be measured, and the other end of the copper temperature sensing piece, the heat-conducting copper foil sheet and the thermosensitive element are sequentially fixedly connected, and the copper temperature sensing piece and the heat-conducting copper foil sheet form a continuous heat-conducting path. The continuous heat-conducting path is formed by the copper temperature sensing piece, the heat-conducting copper foil sheet and the thermosensitive element, the heat transfer efficiency is improved, the thermosensitive element can perceive temperature changes more quickly, and therefore the sensitivity and response speed of ignition detection are improved.

Description

Technical Field

[0001] This utility model relates to the field of intelligent kitchen appliance technology, and in particular to a temperature sensing device for a range hood. Background Technology

[0002] The existing ignition linkage function between gas cooktops and range hoods typically relies on the cooktop sending a wireless signal to the range hood after successful ignition, thus automatically turning on the range hood. This solution usually requires the cooktop and range hood to be from the same brand or use the same wireless communication protocol, making it difficult to achieve a unified communication standard between different brands. To solve the cross-brand linkage problem, some range hoods use temperature probes or infrared thermometry to sense the cooktop's ignition status. However, the detection method of existing temperature probes is greatly affected by cooking conditions. For example, water vapor, due to its strong heat storage capacity, is easily detected by the probe under boiling and steaming conditions; while in conditions with less moisture, such as frying and grilling, the air above the cooktop is mainly dry and hot, with weak heat transfer and large fluctuations. If the probe's thermal conductivity is insufficient or its placement is too far from the heat source, the generated temperature change signal is often not significant enough, resulting in insufficient ignition detection or even significant lag. Utility Model Content

[0003] The purpose of this invention is to address at least one of the aforementioned existing technical problems by providing a temperature sensing device for a range hood. This device enables rapid and sensitive thermal detection of the dry, hot air disturbance generated after the stove is ignited, thereby accurately identifying the ignition status, reducing temperature lag, and improving the reliability of the range hood's automatic start-up.

[0004] This utility model provides a temperature sensing device for a range hood, the temperature sensing device including a copper temperature sensing element, a thermally conductive copper foil, a thermistor and a circuit board, the thermistor being electrically connected to the circuit board; One end of the copper temperature sensing element is used to extend into the space to be measured, and the other end of the copper temperature sensing element, the thermally conductive copper foil, and the thermistor are fixedly connected in sequence, forming a continuous heat conduction path between the copper temperature sensing element and the thermally conductive copper foil.

[0005] In a possible implementation, the temperature sensing device further includes a solder layer, through which the copper temperature sensing element and the thermally conductive copper foil are soldered together.

[0006] In a possible implementation, the contact area between the copper temperature sensing element and the thermally conductive copper foil is greater than the cross-sectional area of ​​the copper temperature sensing element along its radial direction.

[0007] In a possible implementation, the thermally conductive copper foil and the thermistor are soldered together via the solder layer.

[0008] In a possible implementation, the thickness of the solder layer is greater than the wall thickness of the copper temperature sensing element.

[0009] In a possible implementation, the temperature sensing device further includes an electrical connector, through which the thermistor is electrically connected to the circuit board.

[0010] In a possible implementation, the electrical connector is a copper foil.

[0011] In a possible implementation, the temperature sensing device further includes a plastic housing with mounting holes; The thermally conductive copper foil, the thermistor, the electrical connector, and the circuit board are housed within the plastic housing, and the copper temperature sensing element can extend out of the plastic housing through the mounting hole to form a temperature measuring section.

[0012] In a possible implementation, the temperature sensing device further includes a seal disposed at the mounting hole of the plastic housing, and the seal is sealed to the copper temperature sensing element.

[0013] In a possible implementation, the temperature sensing device further includes a heat insulation element that is fitted against the inner wall of the plastic housing.

[0014] The temperature sensing device for range hoods provided by this utility model has the following beneficial effects: This invention provides a temperature sensing device for a range hood. The device includes a copper temperature sensing element, a thermally conductive copper foil, a thermistor, and a circuit board. The thermistor is electrically connected to the circuit board. One end of the copper temperature sensing element extends into the space to be measured. The other end of the copper temperature sensing element, the thermally conductive copper foil, and the thermistor are sequentially and fixedly connected, forming a continuous heat conduction path. By constructing a continuous heat conduction path with the copper temperature sensing element, the thermally conductive copper foil, and the thermistor, heat transfer efficiency is improved. The thermistor can detect temperature changes more quickly, thereby enhancing the sensitivity and response speed of ignition detection. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the temperature sensing device in an embodiment of the present invention; Figure 2This is a schematic diagram of the temperature sensing device in an embodiment of the present invention; Figure 3 This is a schematic diagram of the temperature sensing device in an embodiment of the present invention; Figure 4 This is a cross-sectional view of the temperature sensing device in an embodiment of this utility model.

[0017] The following is supplementary explanation of the attached figures: 1. Copper temperature sensing element; 2. Thermally conductive copper foil; 3. Thermistor; 4. Circuit board; 5. Solder layer; 6. Electrical connector; 7. Connecting wire; 8. Plastic housing; 9. Sealing element. Detailed Implementation

[0018] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0020] Understandably, the existing ignition linkage function between gas cooktops and range hoods typically relies on the cooktop sending a wireless signal to the range hood after successful ignition, thus automatically turning on the range hood. This solution usually requires the cooktop and range hood to be from the same brand or use the same wireless communication protocol, making it difficult to achieve a unified communication standard between different brands. Furthermore, most gas cooktops are battery-powered, and the frequent waking and signal transmission of the wireless communication module significantly shortens battery life, affecting ease of use.

[0021] To address cross-brand compatibility issues, some range hoods employ temperature probes or infrared thermometry to detect the ignition status of the cooktop. However, existing temperature probe detection methods are significantly affected by cooking conditions. For example, water vapor, due to its strong heat storage capacity, is easily detected by the probe during boiling and steaming. In contrast, during frying, stir-frying, and grilling, where there is less moisture, the air above the cooktop is primarily dry and hot, resulting in weak heat transfer and significant temperature fluctuations. If the probe's thermal conductivity is insufficient or its placement is too far from the heat source, the generated temperature change signal is often not significant enough, leading to insensitive ignition detection or even noticeable lag. Furthermore, while some infrared thermometry solutions offer fast response times, their hardware costs are high, and the viewing angle needs to be adjusted according to the user's kitchen environment during installation, limiting their practical application.

[0022] like Figure 1 As shown, this application provides a temperature sensing device for a range hood. The temperature sensing device includes a copper temperature sensing element 1, a thermally conductive copper foil 2, a thermistor 3, and a circuit board 4. The thermistor 3 is electrically connected to the circuit board 4. One end of the copper temperature sensing element 1 is used to extend into the space to be measured. The other end of the copper temperature sensing element 1, the heat-conducting copper foil 2 and the thermistor 3 are fixedly connected in sequence, and the copper temperature sensing element 1 and the heat-conducting copper foil 2 form a continuous heat conduction path.

[0023] The continuous heat conduction path formed by the copper temperature sensing element 1, the heat-conducting copper foil 2, and the thermistor 3 improves the heat transfer efficiency. The thermistor 3 can detect temperature changes more quickly, thereby improving the sensitivity and response speed of ignition detection.

[0024] Understandably, existing temperature sensing devices consist of a stainless steel casing, thermal grease, and a sensor chip. However, they have high thermal resistance. Due to the disturbance of dry, hot air after ignition, the heat is not sustained, and it takes a long time for the temperature to be transferred to the sensor chip or the temperature change is small.

[0025] Specifically, the copper temperature sensing element 1 serves as a temperature acquisition end. One end of the copper temperature sensing element 1 is configured as a temperature measuring end, which extends into the space above the stove to directly contact the dry, hot air generated during cooking. The other end of the copper temperature sensing element 1 is configured as a connecting end, which is used for welding to the heat-conducting copper foil 2. The heat-conducting copper foil 2 is disposed between the copper temperature sensing element 1 and the thermistor 3, and serves as a relay heat-conducting plate to further transfer the heat from the copper temperature sensing element 1 to the thermistor 3. The heat-conducting copper foil 2 is a sheet-shaped metal conductor, and its surface is provided with welding areas for welding to the copper temperature sensing element 1 and the thermistor 3.

[0026] Optionally, the thermally conductive copper foil 2 can be a rectangular sheet, a strip, or a widened pad structure. The thermally conductive copper foil 2 not only serves as a heat transfer medium, but also as a mounting pad for the thermistor 3, so that one electrode of the thermistor 3 can be directly soldered onto the thermally conductive copper foil 2.

[0027] Specifically, the thermistor 3 is used to respond to the temperature transmitted from the thermally conductive copper foil 2 with electrical characteristics. In one embodiment, the thermistor 3 is a surface-mount thermistor (NTC); in another embodiment, the thermistor 3 is a thermistor chip.

[0028] Specifically, the thermistor 3 has a sheet-like structure and two electrode terminals. One electrode of the thermistor 3 is welded to the thermally conductive copper foil 2, and the other electrode of the thermistor 3 is connected to the pad of the circuit board 4 through an electrical connection structure, so that the thermistor 3 can convert temperature changes into electrical signals and transmit them to the circuit board 4.

[0029] Specifically, the circuit board 4 is used to collect and process the electrical signal of the thermistor 3. The circuit board 4 is provided with pads for connecting to the output terminal of the thermistor 3, so that the whole machine controller can determine whether the stove is in the ignition state based on the resistance change of the thermistor 3.

[0030] In one embodiment, the circuit board 4 is a single-sided board, and the circuit board 4 includes components such as connectors, signal acquisition circuits and filtering circuits.

[0031] Specifically, the copper temperature sensing element 1 and the heat-conducting copper foil 2 form a continuous metal heat conduction path. Starting from the copper temperature sensing element 1 located in the space to be measured, heat is transferred along the copper temperature sensing element 1 to its tail end, through the solder layer 5 to the heat-conducting copper foil 2, and then from the heat-conducting copper foil 2 to the electrode terminals of the thermistor 3, finally reaching the sensitive chip inside the thermistor 3. The thermistor 3 converts temperature changes into a corresponding electrical signal, which is transmitted to the range hood's control system via the circuit board 4 to identify the ignition status of the stove.

[0032] Specifically, the temperature sensor is installed on the range hood and is detachably connected to the range hood. The space to be measured is the cooking area of ​​the range hood facing the target stove.

[0033] Specifically, the temperature sensing device also includes a connecting line 7, which is used to realize the electrical connection between the thermistor 3 and the circuit board 4.

[0034] Optionally, the connecting wire 7 can be a metal wire, copper foil lead, or flexible circuit (FPC). One end of the connecting wire 7 is soldered to the electrode terminal of the thermistor 3, and the other end is connected to the pad or connector on the circuit board 4. The connecting wire 7 is used to transmit the temperature signal output by the thermistor 3 to the circuit board 4.

[0035] Furthermore, the temperature sensing device also includes a solder layer 5, through which the copper temperature sensing element 1 and the thermally conductive copper foil 2 are soldered together. Soldering the copper temperature sensing element 1 and the thermally conductive copper foil 2 together through the solder layer 5 reduces contact thermal resistance and makes the heat conduction path more stable and continuous, thereby further improving temperature transfer efficiency and temperature response speed.

[0036] Specifically, the tail end of the copper temperature sensing element 1 is pressed onto the reserved welding area of ​​the heat-conducting copper foil 2. Solder paste or pre-placed solder strip is applied to the contact area. The area is heated by welding to melt the solder and fully wet the surfaces of the copper temperature sensing element 1 and the heat-conducting copper foil 2. After cooling, a continuous solder layer 5 is formed between the copper temperature sensing element 1 and the heat-conducting copper foil 2.

[0037] Specifically, the thermal conductivity of thermal grease is only about 1-5 W / (m·K), which is a low thermal conductivity filler material, while the thermal conductivity of tin in solder layer 5 is 67 W / (m·K), and its thermal conductivity is significantly higher than that of thermal grease. In addition, solder layer 5 forms a continuous metal connection interface after soldering, and solder layer 5 can provide a stable and high metal thermal conductivity channel, so that heat can be transferred more effectively to the thermally conductive copper foil 2 and the subsequent thermistor 3.

[0038] Specifically, to illustrate the equivalent thermal conductivity of the heat conduction path formed by the copper temperature sensing element 1, the solder layer 5, and the thermally conductive copper foil 2, its comprehensive thermal conductivity is described. Along the heat transfer direction, the copper temperature sensing element 1, the thick tin-covered area, and the solder interface can be equivalently calculated using a series thermal conductivity model, and its comprehensive thermal conductivity K can be expressed by the following formula:

[0039] in, The equivalent thermal resistance of the copper temperature sensing element in the heat conduction path is represented by K1, which is the thermal conductivity of the copper temperature sensing element, ε1 is the heat conduction length of the copper temperature sensing element, and A1 is the cross-sectional area of ​​the copper temperature sensing element. Used to represent the equivalent thermal resistance of the solder layer in the heat conduction path, K2 is the thermal conductivity of the solder layer, ε2 is the thermal conduction length of the solder layer, and A2 is the cross-sectional area of ​​the solder layer; Used to represent the equivalent thermal resistance of the weld surface in the heat conduction path, Kw is the thermal conductivity of the solder, where Kw = K2; ε w A is the equivalent thickness in the direction of the weld surface; w This represents the overlapping area between the welded surfaces.

[0040] Specifically, the thermal conductivity K1 of the copper material in the copper temperature sensing element 1 is 401 W / (m·K), and the thermal conductivity K2 of the solder material in the solder layer 5 is 67 W / (m·K). In this embodiment, the cross-sectional area A2 of the thick tin cover layer and the overlapping area A of the solder interface are... w The cross-sectional area A1 of the thick tin layer and the solder interface is significantly larger than that of the copper temperature sensing element 1, resulting in a relatively small thermal resistance in the equivalent heat conduction path. According to the above equivalent heat conduction formula, the equivalent thermal resistance of the second and third terms corresponding to the solder layer 5 and the solder surface has a much smaller impact on the overall heat conduction path than the equivalent thermal resistance of the copper temperature sensing element 1. Therefore, the overall thermal conductivity K is determined by the copper temperature sensing element 1.

[0041] In one embodiment, the contact area between the copper temperature sensing element 1 and the thermally conductive copper foil 2 is greater than the cross-sectional area of ​​the copper temperature sensing element 1 along its radial direction. This increased contact area between the copper temperature sensing element 1 and the thermally conductive copper foil 2 further reduces the thermal resistance at the thermal interface between them, thereby improving heat transfer efficiency and accelerating the temperature sensing response speed.

[0042] In one embodiment, the tail end of the copper temperature sensing element 1 is configured as a planar structure that can fit with the heat-conducting copper foil 2, and the lateral dimension of the heat-conducting copper foil 2 is larger than the cross-sectional area of ​​the copper temperature sensing element 1 along the radial direction of the copper temperature sensing element 1.

[0043] Optionally, the copper temperature sensing element 1 can be cylindrical, flat, or top-flattened, thereby forming a relatively large contact surface at the tail end.

[0044] Specifically, the thermally conductive copper foil 2 is a sheet-shaped metal conductor, and the contact area between the thermally conductive copper foil 2 and the thermally conductive copper foil 2 is much larger than the radial cross-sectional area of ​​the copper temperature sensing element 1.

[0045] Furthermore, the thermally conductive copper foil 2 and the thermistor 3 are soldered together by a solder layer 5. In this way, the solder layer 5 solders the thermally conductive copper foil 2 and the thermistor 3 together, which can ensure the stability of the thermal interface and reduce the interface thermal resistance, thereby enabling temperature changes to be transferred to the thermistor 3 more efficiently and improving the overall temperature sensing accuracy.

[0046] Specifically, the welding area of ​​the thermally conductive copper foil 2 can be aligned with the electrode terminals of the thermistor 3, and the thermally conductive copper foil 2 and the thermistor 3 form a surface-fitting or partially overlapping structure; then solder paste or pre-placed solder strip is applied to the alignment area, so that the solder melts, spreads and wets between the thermally conductive copper foil 2 and the thermistor 3. When the solder cools and solidifies, a stable solder layer 5 is formed.

[0047] Furthermore, the thickness of the solder layer 5 is greater than the wall thickness of the copper temperature sensing element 1. Increasing the thickness of the solder layer 5 can further reduce the thermal resistance of the heat-conducting interface, allowing heat to be transferred to the thermistor 3 more quickly, thereby improving the temperature sensing response speed and detection stability.

[0048] Specifically, the copper temperature sensing element 1 has a hollow structure, that is, the copper temperature sensing element 1 is a hollow copper tube and the wall thickness of the copper temperature sensing element 1 is consistent along the axial direction of the copper temperature sensing element 1, and the tube opening of the copper temperature sensing element 1 has an annular opening structure.

[0049] Furthermore, the temperature sensing device also includes an electrical connector 6, through which the thermistor 3 is electrically connected to the circuit board 4. Connecting the thermistor 3 to the circuit board 4 via the electrical connector 6 ensures stable and reliable signal transmission, avoids poor contact due to solder joint heating or vibration, and improves the overall reliability of temperature detection.

[0050] Specifically, the two ends of the electrical connector 6 are fixedly connected to the electrode terminals of the thermistor 3 and the pad area of ​​the circuit board 4, respectively.

[0051] In one embodiment, one end of the electrical connector 6 is electrically connected to the electrode of the thermistor 3 by welding; the other end of the electrical connector 6 is welded to the pad of the circuit board 4 so that the electrical signal generated by the thermistor 3 can be transmitted to the circuit board 4.

[0052] Optionally, the electrical connector 6 can be a structure with conductivity, such as flexible copper foil, metal wire, metal tab, or conductive pad.

[0053] In one embodiment, the electrical connector 6 is a copper foil. Thus, using a copper foil for the electrical connector 6 reduces conductive impedance and improves signal transmission stability, thereby enhancing the accuracy and reliability of temperature detection.

[0054] Specifically, the copper foil is a sheet or strip-shaped conductive metal foil structure with good conductivity and flexibility.

[0055] In this embodiment, the thermally conductive copper foil 2 is the first copper foil, and the electrical connector 6 is the second copper foil.

[0056] Furthermore, such as Figure 2As shown, the temperature sensing device also includes a plastic housing 8 with mounting holes; a thermally conductive copper foil 2, a thermistor 3, an electrical connector 6, and a circuit board 4 are housed within the plastic housing 8, and the copper temperature sensing element 1 can extend out of the plastic housing 8 through the mounting holes to form a temperature measuring section. By placing the thermally conductive copper foil 2, the thermistor 3, and the circuit board 4 inside the plastic housing 8, and allowing the copper temperature sensing element 1 to extend out through the mounting holes to form a temperature measuring section, structural protection and positioning of the internal components can be achieved, while ensuring that the temperature measuring section directly contacts the space to be measured, thereby improving temperature measurement accuracy and assembly reliability.

[0057] Specifically, the plastic housing 8 is provided with a mounting hole for the copper temperature sensing element 1 to pass through, and the plastic housing 8 is provided with a receiving position for accommodating the circuit board 4. The thermally conductive copper foil 2, the thermistor 3 and the electrical connector 6 are disposed on the circuit board 4. During assembly, the copper temperature sensing element 1 passes through the mounting hole from the inside of the plastic housing 8 so that the front end of the copper temperature sensing element 1 extends out of the housing, forming a temperature measuring section for contacting the space to be measured, while the rear end of the copper temperature sensing element 1 is fixedly connected to the thermally conductive copper foil 2 to form a heat conduction path.

[0058] Preferably, the temperature measuring section has a measuring length of 4mm-10mm.

[0059] Specifically, the plastic housing 8 uses its internal limiting components to position the thermally conductive copper foil 2, the thermally sensitive element 3, the electrical connector 6, and the circuit board 4, so that the thermally conductive copper foil 2, the thermally sensitive element 3, the electrical connector 6, and the circuit board 4 maintain a stable arrangement and fit within the housing.

[0060] In one embodiment, the connecting wire 7 is disposed below the second copper foil. When the thermistor 3 is mounted above the thermally conductive copper foil 2 or the electrical connector 6, one end of the connecting wire 7 is fixed to the solder joint of the thermistor 3 by solder to form an electrical connection. The other end of the connecting wire 7 extends to the outside of the plastic housing 8 for electrical connection with the control device.

[0061] Specifically, to avoid affecting the heat conduction path, the connecting line 7 is arranged in the non-heat-conducting area of ​​the plastic housing 8.

[0062] Furthermore, such as Figure 3 and Figure 4 As shown, the temperature sensing device also includes a seal 9, which is disposed at the mounting hole of the plastic housing 8 and is sealed to the copper temperature sensing element 1. In this way, the seal 9 prevents oil fumes and moisture from entering the housing, thereby improving the protective performance and long-term operational stability of the temperature sensing device.

[0063] Specifically, the seal 9 has an annular or sleeve-shaped structure. The inner side of the seal 9 has a covering portion that matches the outer diameter of the copper temperature sensing element 1, and the outer side of the seal 9 has a support portion that mates with the mounting hole. During assembly, the outer support portion of the seal 9 is pressed into the inner wall of the mounting hole of the plastic housing 8 to achieve circumferential sealing; the inner covering portion of the seal 9 is tightly fitted onto the surface of the copper temperature sensing element 1 to achieve axial sealing.

[0064] In one embodiment, the seal 9 is arranged between the walls of the mounting hole; in another embodiment, the seal 9 is arranged on the inner or outer side of the housing near the mounting hole, and the seal 9 is fixed to the adjacent area of ​​the mounting hole by the limiting structure or pressing structure of the housing, and the seal 9 forms a sealing interface when the copper temperature sensing element 1 passes through the mounting hole.

[0065] Optionally, the seal 9 is made of a material with elasticity and sealing properties, such as a silicone ring, rubber ring, foam gasket, EPDM sealing strip, or polyurethane seal 9.

[0066] Furthermore, the temperature sensing device also includes a heat insulation element (not shown), which is attached to the inner wall of the plastic housing 8. By providing a heat insulation element on the inner wall of the plastic housing 8, external temperature interference can be reduced, the internal thermal environment can be stabilized, thereby improving the accuracy and anti-interference capability of temperature detection.

[0067] Specifically, the insulation component is used to form a heat insulation layer inside the plastic housing 8, so that the sensing area has a thermal isolation effect from the external environment.

[0068] In one embodiment, the insulation component is disposed inside the plastic housing 8, and the outer surface of the insulation component is fitted to the inner wall of the plastic housing 8. During the assembly process, the insulation component is positioned and limited by the inner wall of the housing, so that the insulation component can be placed in a preset position.

[0069] In another embodiment, the insulation component is fixedly connected to the inner wall of the plastic housing 8 by a fixing structure.

[0070] Alternatively, the fixing structure may be one of the following: adhesive, hot melt fastener, or snap-fit ​​structure.

[0071] In one embodiment, the insulation component is pre-placed inside the mold during the injection molding process of the plastic shell 8, and the mold structure allows at least a portion of the insulation component to be embedded in the inner wall of the plastic shell 8.

[0072] In one embodiment, the insulation element is a sheet or block structure made of thermal insulation material with a low thermal conductivity, used to form a thermal insulation layer inside the plastic housing 8 to reduce the interference of the external ambient temperature on the thermal element 3.

[0073] Alternatively, the insulation component may be made of one of the following: EVA foam, silicone rubber sheet, polyurethane foam, glass fiber cotton, or ceramic fiber pad.

[0074] The working process of the temperature sensing device in the embodiments of this application is described below with reference to specific application scenarios: S1, when the target stove is ignited, the dry and hot air generated above the stove rises along the natural convection path, and the temperature measuring section of the copper temperature sensing element 1 set below the range hood first comes into contact with the dry and hot airflow and produces a temperature change. S2, the heat of the dry hot air is quickly conducted to the heat-conducting copper foil 2 through the copper temperature sensing element 1, and then continues to be efficiently transferred to the thermistor 3 under the action of the heat-conducting copper foil 2, causing the thermistor 3 to produce corresponding changes in electrical characteristics. S3, the thermal element 3 converts temperature changes into electrical signals and transmits them to the circuit board 4 through the electrical connector 6. The circuit board 4 analyzes the collected temperature data and identifies whether the target stove is in the ignition state. S4, when the target stove is determined to be in the ignition state, the circuit board 4 generates an ignition identification signal and transmits it to the control device of the range hood to trigger the range hood to turn on automatically; if the temperature change does not meet the ignition conditions, the circuit board 4 continues to monitor and maintain the standby state of the target stove.

[0075] The following describes specific embodiments of this application based on the above technical solution.

[0076] Example 1 Please see Figure 1 This embodiment provides a temperature sensing device for a range hood. The temperature sensing device includes a copper temperature sensing element 1, a thermally conductive copper foil 2, a thermistor 3, and a circuit board 4. The thermistor 3 is electrically connected to the circuit board 4. One end of the copper temperature sensing element 1 is used to extend into the space to be measured. The other end of the copper temperature sensing element 1, the heat-conducting copper foil 2 and the thermistor 3 are fixedly connected in sequence, and the copper temperature sensing element 1 and the heat-conducting copper foil 2 form a continuous heat conduction path.

[0077] The temperature sensing device also includes a first solder layer 5, through which the copper temperature sensing element 1 and the thermally conductive copper foil 2 are soldered together. The contact area between the copper temperature sensing element 1 and the thermally conductive copper foil 2 is larger than the radial cross-sectional area of ​​the copper temperature sensing element 1. The temperature sensing device also includes a second solder layer 5, through which the thermally conductive copper foil 2 and the thermistor 3 are soldered together. The radial cross-sectional area of ​​the second solder layer 5 is larger than the radial cross-sectional area of ​​the copper temperature sensing element 1. The temperature sensing device also includes an electrical connector 6, through which the thermistor 3 is electrically connected to the circuit board 4. The electrical connector 6 is a copper foil.

[0078] The temperature sensing device also includes a plastic housing 8 with mounting holes; a thermally conductive copper foil 2, a thermistor 3, a second copper foil, and a circuit board 4 are housed in the plastic housing 8, and a copper temperature sensing element 1 can extend out of the plastic housing 8 through the mounting holes to form a temperature measuring section.

[0079] Example 2 like Figure 3 and Figure 4 As shown, the similarities between Embodiment 2 and Embodiment 1 will not be repeated here. The difference between Embodiment 2 and Embodiment 1 is that the temperature sensing device also includes a sealing element 9. The sealing element 9 is disposed at the mounting hole of the plastic housing 8, and the sealing element 9 is sealed to the copper temperature sensing element 1.

[0080] Example 3 The similarities between Embodiment 3 and Embodiment 1 will not be repeated here. The difference between Embodiment 3 and Embodiment 1 is that the temperature sensing device also includes a heat insulation component, which is attached to the inner wall of the plastic housing 8.

[0081] The above-disclosed embodiments are merely several preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A temperature sensing device for a range hood, characterized in that, The temperature sensing device includes a copper temperature sensing element (1), a thermally conductive copper foil sheet (2), a thermistor (3), and a circuit board (4), wherein the thermistor (3) is electrically connected to the circuit board (4); One end of the copper temperature sensing element (1) is used to extend into the space to be measured. The other end of the copper temperature sensing element (1), the thermally conductive copper foil (2) and the thermistor (3) are fixedly connected in sequence. The copper temperature sensing element (1) and the thermally conductive copper foil (2) form a continuous heat conduction path.

2. The temperature sensing device according to claim 1, characterized in that, The temperature sensing device also includes a solder layer (5), and the copper temperature sensing element (1) and the thermally conductive copper foil (2) are welded together through the solder layer (5).

3. The temperature sensing device according to claim 2, characterized in that, The contact area between the copper temperature sensing element (1) and the thermally conductive copper foil (2) is greater than the cross-sectional area of ​​the copper temperature sensing element (1) along the radial direction of the copper temperature sensing element (1).

4. The temperature sensing device according to claim 2, characterized in that, The thermally conductive copper foil (2) and the thermal element (3) are welded together by the solder layer (5).

5. The temperature sensing device according to claim 4, characterized in that, The thickness of the solder layer (5) is greater than the wall thickness of the copper temperature sensing element (1).

6. The temperature sensing device according to any one of claims 1-5, characterized in that, The temperature sensing device further includes an electrical connector (6), through which the thermistor (3) is electrically connected to the circuit board (4).

7. The temperature sensing device according to claim 6, characterized in that, The electrical connector (6) is a copper foil component.

8. The temperature sensing device according to claim 6, characterized in that, The temperature sensing device also includes a plastic housing (8) with mounting holes. The thermally conductive copper foil (2), the thermistor (3), the electrical connector (6), and the circuit board (4) are housed in the plastic housing (8), and the copper temperature sensing element (1) can extend out of the plastic housing (8) through the mounting hole to form a temperature measuring section.

9. The temperature sensing device according to claim 8, characterized in that, The temperature sensing device further includes a sealing element (9), which is disposed at the mounting hole of the plastic housing (8) and is sealed to the copper temperature sensing element (1).

10. The temperature sensing device according to claim 8, characterized in that, The temperature sensing device also includes a heat insulation component, which is attached to the inner wall of the plastic housing (8).

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