A gas stove temperature sensor

Abstract

The invention discloses a gas stove temperature sensor. The sensing cap heat insulation sleeve and the sensing cap are riveted together to form a closed space. The closed space completely isolates the thermocouple head metal and the back of the sensing cap from the outside air, reducing the influence of the external hot air convection heat exchange and the radiation heat transfer on the back of the sensing cap. The invention has a compact structure, is easy to install, has a large swing range of the sensing cap, is in close contact with the bottom of the cooker, can adapt to various different cookers and the placement of the cookers, has a sensitive response, automatically recognizes the state of no pot, has strong fireproof and heat insulation capabilities, has high temperature measurement accuracy, and accurately transmits temperature, and can accurately detect the temperature signal of the bottom of the cooker in real time.

Description

Technical Field

[0001] The invention relates to the technical field of household gas stoves, in particular to a temperature sensor for gas stoves. Background Art

[0002] As people's living standards improve, the concept of healthy eating has gradually taken root in people's minds. However, the temperature is not easy to control when cooking with ordinary gas stoves. Food is easily overheated, burnt, and smoked, producing carcinogenic benzopyrene and heterocyclic amines. Therefore, fast, accurate, and intelligent control of the temperature in the pot has become an inevitable trend and demand.

[0003] Most of the existing gas stove temperature sensors are mainly used for anti-dry burning function. They increase the number of insulation layers to reduce the impact of flame radiation heat and hot air on the sensor. However, the temperature measurement points are generally open or semi-closed, and are still greatly affected by heat convection, resulting in slow response speed and large temperature detection error. They are not suitable for cooking processes that require fast and accurate response to the temperature in the pot, and can only be simply adapted to cooking or anti-dry burning functions within a large error range. Summary of the invention

[0004] The technical problem to be solved by the present invention is to reduce the heat exchange between the sensor cap and its external environment, exchange the heat of the external environment of the sensor cap with the bottom of the pot, and at the same time reduce the heat capacity of the entire sensor head, so as to provide a gas stove temperature sensor, enhance the response speed and improve the measurement accuracy.

[0005] The present invention is implemented in the following way. A gas stove temperature sensor includes a sensing cap and a thermocouple connected to the bottom of the sensing cap, characterized in that it also includes a sensing cap insulation sleeve, the sensing cap insulation sleeve and the sensing cap are riveted together to form a sensing cap assembly, and a closed space is formed below the sensing cap. The sensing cap and the sensing cap insulation sleeve are supported on the support assembly through the sensing cap compression spring, and the wire of the thermocouple passes through the sensing cap insulation sleeve and the sleeve at the lower end of the support assembly. The closed space completely isolates the metal of the thermocouple head and the back of the sensing cap from the outside air, reduces the influence of the external hot air convection heat transfer, and the influence of the radiation heat transfer on the back of the sensing cap, and improves the detection accuracy. At the same time, the heat capacity of the structural parts is very small, which greatly improves the sensor response speed and the real-time temperature accuracy. The telescopic sensing cap assembly can move up and down and can swing freely in the circumferential direction, close to the bottom of the pot, and improve reliability.

[0006] Furthermore, an insulation tube is connected to the center of the insulation sleeve of the sensor cap, and the wires of the thermocouple pass through the insulation tube. The insulation tube seals the pipeline and fixes the wires of the thermocouple by extrusion deformation to prevent the fine thermocouple wires at the head from breaking due to repeated movement.

[0007] Furthermore, the outer periphery of the sensing cap assembly is provided with a heat-conducting jacket, which is installed on the supporting assembly through a heat-conducting jacket compression spring, and has a telescopic structure, and can move up and down and swing around, which is conducive to close contact with the bottom of the pot. There is a uniform annular gap between the sensing cap assembly and the heat-conducting jacket, and the supporting assembly has a corresponding annular gap to form an airflow channel, which reduces direct heat conduction and is used to discharge debris falling from the upper gap.

[0008] Furthermore, the top of the heat-conducting jacket is an annular plane, which increases the heat transfer area with the bottom of the pot.

[0009] Furthermore, the support assembly is mounted on the support via a support assembly compression spring.

[0010] Furthermore, the support assembly and the support are provided with corresponding guide members.

[0011] Furthermore, the upper end of the heat-conducting jacket is provided with a heat-conducting ring which is in close contact with the jacket and has a higher thermal conductivity, so that the heat of the heat-insulating jacket can be exchanged with the bottom of the pot more quickly through the heat-conducting ring, and the temperature difference between the surrounding and the bottom of the pot can be smaller.

[0012] Furthermore, the sensing cap is mounted on the heat-conducting ring through the legs. The sensing cap assembly can slide up and down relative to the heat-conducting ring to ensure the concentricity of the sensing cap and the heat-conducting ring, and reduce the influence of heat radiation increased due to non-concentricity; the sensing cap and the heat-conducting ring are in point contact to reduce contact heat conduction.

[0013] Furthermore, a micro switch trigger device is also installed at the lower end of the support assembly.

[0014] Furthermore, the temperature sensor also includes a sensing cap insulation sleeve temperature measuring line parallel to the thermocouple, both ends of which are connected to the controller, and the sensing cap insulation sleeve temperature measuring probe point is located below the sensing cap temperature measuring probe point, both inside the sensing cap assembly; the end of the sleeve at the lower end of the support assembly is connected to the fan through a hose.

[0015] The control method of the temperature sensor with dual temperature measuring lines as described above starts the fan when it is detected that the temperature of the temperature measuring probe point II of the sensing cap insulation sleeve is higher than the temperature of the temperature measuring probe point I of the sensing cap, and stops blowing when the temperature difference between the temperature of the temperature measuring probe point II and the temperature measuring probe point I is less than a certain value Y. The fan is used to keep the temperature difference between the sensing cap and a certain ambient temperature below it within a certain range, so that the ambient temperature below is as close to the temperature of the sensing cap as possible, thereby reducing the influence of the environment below on the temperature measurement of the sensing cap.

[0016] According to the temperature measurement method of the temperature sensor described above, the controller collects the temperature value T of the probe point I. I And the temperature value of probe point II T II , the change function f (T II ), and then the temperature value T Iand the variation function f(T II ) are added to get the pot bottom temperature T0 for use in the control program. That is, the pot bottom temperature T0 = T I + f(T II ), f(T II ) is a variable function, and T0, T I The data is then deduced based on the summary of the changing rules. As a supplement to the influence of ambient temperature, the obtained temperature error is much smaller than the measurement value of a single thermocouple.

[0017] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: compact structure, easy installation, large swing range of the sensor cap, close contact with the bottom of the cooker, ability to adapt to various cookers and the placement of the cookers, sensitive response, automatic identification of the no-pot state, strong fireproof and heat-insulating capabilities, high temperature measurement accuracy, accurate temperature transmission, and the ability to accurately detect the temperature signal of the bottom of the cooker in real time, collect and provide it to the controller for automatic control of the combustion state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic cross-sectional structure diagram of the temperature sensor of the present invention;

[0019] Figure 2 This is a schematic diagram of the micro switch installation;

[0020] Figure 3 It is a schematic diagram of the structure of the temperature sensor head with a heat-conducting ring;

[0021] Figure 4 It is a schematic diagram of the structure of a temperature sensor with two temperature measuring wires. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] Embodiment 1, as Figure 1As shown, a gas stove temperature sensor comprises a sensing cap 1 and a thermocouple 2 connected to the bottom of the sensing cap 1. The head of the thermocouple 2 and the sensing cap 1 made of a material with high thermal conductivity are riveted, and the riveting hole of the sensing cap 1 is horizontal; the sensing cap 1, the sensing cap compression spring 4 and the sensing cap heat insulation sleeve 3 are connected together through the riveting feet on the sensing cap 1 to form a sensing cap assembly, and a closed space is formed under the sensing cap 1. The sensing cap 1 and the sensing cap heat insulation sleeve 3 are supported on a supporting assembly 6 through the sensing cap compression spring 4, and a heat insulation pipe 5 is connected to the center of the sensing cap heat insulation sleeve 3. The wire of the thermocouple 2 passes through the insulation tube 5 and the sleeve 7 at the lower end of the support assembly 6 to connect to the controller. The insulation tube 5 closes the pipeline and fixes the wire of the thermocouple 2 by extrusion deformation to prevent the small thermocouple wire at the head from breaking due to repeated movement. The closed space in the sensing cap assembly completely isolates the metal head of the thermocouple 2 and the back of the sensing cap 1 from the outside air, reducing the influence of the external hot air convection heat exchange and the influence of the radiation heat transfer at the bottom of the sensing cap 1, improving the detection accuracy. At the same time, the heat capacity of the structural parts is very small, which greatly improves the sensor response speed and improves the real-time temperature accuracy. The sensing cap compression spring 4 enables the sensing cap assembly to move up and down and swing freely in the circumferential direction, close to the bottom of the pot, and improves reliability.

[0024] There is also a heat-conducting jacket 10 on the periphery of the sensing cap assembly. The heat-conducting jacket 10 is installed on the support assembly 6 through the heat-conducting jacket compression spring 11. The telescopic structure can move up and down and swing around, which is conducive to close to the bottom of the pot; the top of the heat-conducting jacket 2 is an annular plane to increase the heat transfer area with the bottom of the pot. There is a uniform annular gap between the sensing cap assembly and the heat-conducting jacket 2, and the support assembly 4 has a corresponding annular gap to form an airflow channel, which can not only reduce direct heat conduction but also be used to discharge debris falling from the upper gap.

[0025] The support assembly 6 is mounted on the support 9 through the support assembly compression spring 8. The support assembly 6 and the support 9 are provided with corresponding guide members. The sleeve 7 at the lower end of the support assembly 6 is provided with a micro switch 12 trigger device, such as Figure 2 As shown, the telescopic up and down movement structure makes it easy to identify whether the pot is on.

[0026] Embodiment 2, as Figure 3 As shown, the difference from the first embodiment is that the upper end of the heat-conducting jacket 10 is provided with a heat-conducting ring 13 which is in close contact with the heat-conducting ring and has a higher thermal conductivity, and the sensing cap 1 is mounted on the heat-conducting ring 13 through the legs 14. The heat of the heat-insulating jacket 10 is exchanged with the bottom of the pot faster through the heat-conducting ring 13, so that the temperature difference between the surrounding and the bottom of the pot is smaller; the sensing cap 1 can slide up and down relative to the heat-conducting ring 13, and rotate with the heat-conducting ring 13 in the circumferential direction, so as to ensure the concentricity of the sensing cap 1 and the heat-conducting ring 13, and reduce the influence of heat radiation increased due to non-concentricity; the sensing cap 1 and the heat-conducting ring 13 are in point contact, so as to reduce contact heat conduction.

[0027] Embodiment 3 is different from the above embodiments in that Figure 4 As shown, the temperature sensor also includes a sensing cap insulation sleeve temperature measuring line 14 parallel to the thermocouple 2, both ends of which are connected to the controller, and the temperature measuring probe point II of the sensing cap insulation sleeve temperature measuring line 14 is located below the temperature measuring probe point I of the sensing cap 1, both inside the sensing cap assembly; the end of the sleeve 7 at the lower end of the support assembly 6 is connected to the fan 16 through a hose 15.

[0028] The control method of the temperature sensor with dual temperature measuring lines as described above, when it is detected that the temperature of the temperature measuring point II of the sensing cap insulation sleeve 3 is higher than the temperature of the temperature measuring point I of the sensing cap 1, the fan 16 is started, and the blowing is stopped when the temperature difference between the temperature measuring point II and the temperature measuring point I is less than a certain value Y. The fan 16 is used to keep the temperature difference between the sensing cap 1 and a certain ambient temperature below it within a certain range, so that the ambient temperature below is as close to the temperature of the sensing cap as possible, thereby reducing the influence of the environment below on the temperature measurement of the sensing cap 1. The values ​​of X and Y can be set between 5°C and 20°C. The wind is discharged from the fan 16, the hose 15, the sleeve 7, the support assembly 6, the internal space of the thermal conductive jacket 10, and the holes around the support assembly 6 in sequence, as shown in FIG. Figure 4 Direction of arrow shown.

[0029] According to the temperature measurement method of the temperature sensor described above, the controller collects the temperature value T of the probe point I. I And the temperature value of probe point II T II , the change function f (T II ), and then the temperature value T I and the variation function f(T II ) are added to get the pot bottom temperature T0 for use in the control program. That is, the pot bottom temperature T0 = T I + f(T II ), f(T II ) is a variable function, and T0, T I The data is then deduced based on the summary of the changing rules. As a supplement to the influence of ambient temperature, the obtained temperature error is much smaller than the measurement value of a single thermocouple.

Claims

1. A gas stove temperature sensor, comprising a sensing cap and a thermocouple connected to the bottom of the sensing cap, characterized in that The invention also includes a sensing cap heat-insulating sleeve, which is riveted together with the sensing cap to form a sensing cap assembly, forming a closed space below the sensing cap, the sensing cap and the sensing cap heat-insulating sleeve are supported on the support assembly by a sensing cap compression spring, and the wire of the thermocouple passes through the sensing cap heat-insulating sleeve and the sleeve at the lower end of the support assembly; the sensing cap assembly is also provided with a heat-conducting outer sleeve on the periphery, the heat-conducting outer sleeve is installed on the support assembly by a heat-conducting outer sleeve compression spring, a uniform annular gap is provided between the sensing cap assembly and the heat-conducting outer sleeve, and the support assembly has a corresponding annular gap; the invention also includes a sensing cap heat-insulating sleeve temperature measuring line parallel to the thermocouple, both ends of which are connected to a controller, and the sensing cap heat-insulating sleeve temperature measuring probe points are located below the sensing cap probe points, both inside the sensing cap assembly; the controller collects the probe point I temperature value TI and the probe point II temperature value TII, calculates the change function f (TII) according to a preset formula, and then adds the temperature value TI and the change function f (TII) to obtain the pot bottom temperature T0 for use by the control program.

2. The temperature sensor according to claim 1, characterized in that The center of the sensing cap insulation sleeve is connected with an insulation tube, and the wire of the thermocouple passes through the insulation tube. The insulation tube seals the pipeline and fixes the wire of the thermocouple by extrusion deformation.

3. The temperature sensor according to claim 1, characterized in that The top of the heat-conducting jacket is an annular plane.

4. The temperature sensor according to claim 1, characterized in that The support assembly is mounted on the support via a support assembly compression spring.

5. The temperature sensor according to claim 4, characterized in that The support assembly and the support are provided with corresponding guide members.

6. The temperature sensor according to claim 1, characterized in that The upper end of the heat-conducting outer jacket is provided with a heat-conducting ring which is in close contact with the heat-conducting outer jacket and has a higher heat conductivity.

7. The temperature sensor according to claim 6, characterized in that The sensing cap is mounted on the heat conducting ring through supporting legs.

8. The temperature sensor according to claim 1, characterized in that A micro switch trigger device is also arranged at the lower end of the support assembly.

9. The temperature sensor according to claim 1, characterized in that The end of the sleeve at the lower end of the support assembly is connected to the fan through a hose.

10. The control method of the temperature sensor as claimed in claim 9, wherein the fan is started when it is detected that the temperature of the temperature measuring point II of the insulation sleeve is higher than the temperature of the temperature measuring point of the sensor cap by a certain value X, and the air blowing is stopped when the temperature difference between the temperature measuring point II of the insulation sleeve and the temperature of the temperature measuring point I of the sensor cap is less than a certain value Y, and the fan is used to keep the temperature difference between the sensor cap and a certain ambient temperature below it within a certain range, so that the ambient temperature below is as close to the temperature of the sensor cap as possible, thereby reducing the influence of the environment below on the sensor cap.

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