Temperature and humidity NTC sensor

Abstract

The invention relates to the technical field of sensors, in particular to a temperature and humidity NTC sensor which comprises a cylindrical shell, a sensor body, a protection assembly and a driving assembly, the cylindrical shell is fixedly installed at the sunken position of the bottom of an electric cooker, a rectangular cavity is formed in the cylindrical shell, and the sensor body is arranged in the rectangular cavity; the driving assembly is installed at the bottom of the rectangular cavity and connected with the bottom of the sensor body, the protection assembly is installed in the rectangular cavity, and the driving assembly drives the sensor body and the protection assembly to move at the same time. According to the invention, the protection assembly is arranged above the sensor body, so that the sensor body is prevented from being exposed outside and being attached by kitchen waste foreign matters, and normal work of the sensor body is prevented from being influenced by overflowing of foreign matters such as boiling soup and rice grains during porridge cooking or soup cooking of the electric cooker, and the temperature and humidity detection accuracy of the sensor body is improved; and the cooking effect and the cooking safety are improved.

Description

Technical Field

[0001] The invention relates to the technical field of sensors, in particular to a temperature and humidity NTC sensor. Background Art

[0002] NTC temperature and humidity sensor is a combination of a thermistor and a probe. The working principle of NTC temperature and humidity sensor is based on NTC thermistor, whose resistance value decreases as the temperature increases. This characteristic enables NTC temperature and humidity sensor to sense temperature and humidity changes and convert them into changes in resistance value, and then convert them into measurable temperature signals through circuits. NTC temperature and humidity sensor has performance characteristics such as high sensitivity, high precision and wide operating temperature range. It is suitable for occasions that require precise temperature control, real-time monitoring of the temperature inside the equipment, ensuring that the equipment operates within the optimal operating temperature range, and ensuring cooking effect and safety. NTC temperature and humidity sensor is usually located in the center of the bottom of the rice cooker. This position is closest to the inner pot of the rice cooker and is the focus of food heating. The control circuit of the rice cooker receives signals from the temperature and humidity NTC sensor and monitors the temperature of the food based on these signals. If the set temperature is higher than the current temperature of the temperature and humidity NTC sensor, the rice cooker will continue to heat the food; conversely, if the set temperature has reached or exceeded the current temperature of the temperature and humidity NTC sensor, the rice cooker will stop or reduce heating. However, in daily life, when the rice cooker has not yet started to heat, the exposed temperature and humidity NTC sensor will be attached by water stains or kitchen waste. When the rice cooker is cooking porridge or soup, boiling soup or rice grains and other foreign objects will overflow. The foreign objects will flow from the edge of the rice cooker inner pot to the temperature and humidity NTC sensor, causing the foreign objects to block the detection surface of the temperature and humidity NTC sensor, thereby affecting the accuracy of the temperature measurement of the temperature and humidity NTC sensor.

[0003] In order to prevent foreign matter from obstructing the detection surface of the temperature and humidity NTC sensor, thereby affecting the temperature measurement accuracy of the temperature and humidity NTC sensor, the invention patent with application number CN202121865429.9 provides a second type of electromagnetic heating rice cooker with an anti-electromagnetic interference temperature sensor. The invention arranges a reinforced insulation sensor and a rice cooker assembly at the bottom. The bottom reinforced insulation sensor includes a tower-shaped buffer spring and a sensor baffle. A temperature-sensitive ceramic shell is arranged on the top of the sensor baffle. The temperature-sensitive ceramic shell is provided with at least one thermistor inside. At least one layer of insulating thermal conductive material is arranged on the surface of the thermistor. A ceramic fuse is arranged between the thermistor and the insulating thermal conductive material. A ceramic bracket is arranged outside the temperature-sensitive ceramic shell. A straight-tube buffer spring is arranged inside the ceramic bracket. The top of the tower-shaped buffer spring extends to the outside of the ceramic bracket to solve the problem that the traditional sensor adopts a metal shell, resulting in inaccurate temperature measurement. However, the sensor is still fixedly extended from the bottom of the rice cooker and cannot be protected. Foreign matter obstructs the sensor detection surface and still causes inaccurate temperature measurement.

[0004] Therefore, in order to prevent foreign matter in the rice cooker from obstructing the detection surface of the temperature and humidity NTC sensor, thereby affecting the temperature measurement accuracy of the temperature and humidity NTC sensor, a temperature and humidity NTC sensor is proposed. Summary of the invention

[0005] The object of the present invention is to provide a temperature and humidity NTC sensor. In order to prevent boiling soup or foreign matter such as rice grains from overflowing when cooking porridge or soup in an electric rice cooker, the foreign matter will flow from the edge of the inner pot of the electric rice cooker to the temperature and humidity NTC sensor, causing the foreign matter to block the detection surface of the temperature and humidity NTC sensor, thereby affecting the temperature measurement accuracy of the temperature and humidity NTC sensor. By arranging a protection component on the sensor, the protection component protects the sensor when the electric rice cooker is not working, and the sensor extends from the protection component to detect temperature and humidity when the electric rice cooker is working, thereby preventing foreign matter from adhering to the sensor to affect the temperature measurement accuracy of the sensor, thereby improving the cooking effect and safety.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A temperature and humidity NTC sensor comprises a cylindrical shell, a sensor body, a protection component and a driving component. The cylindrical shell is fixedly mounted at the bottom of an electric cooker and is located at a central depression of the electric cooker. A rectangular cavity is provided inside the cylindrical shell. The sensor body is arranged inside the rectangular cavity. The driving component is mounted at the bottom of the rectangular cavity and connected to the bottom of the sensor body. The protection component is mounted inside the rectangular cavity and is located above the sensor body. The protection component comprises a trapezoidal block and a protection spring. Two trapezoidal blocks are symmetrically mounted inside the rectangular cavity. The inclined surfaces of the trapezoidal blocks face the bottom of the rectangular cavity. The side walls of the two trapezoidal blocks are fitted together. Key-type through grooves are provided on the two trapezoidal blocks. The key-type through grooves run through the entire trapezoidal blocks. The side walls of the key-type through grooves are parallel to the inclined surfaces of the trapezoidal blocks. Two protection springs are symmetrically and horizontally mounted inside the rectangular cavity. The left and right ends of the two protection springs are respectively connected to the inner wall of the cylindrical shell and the side walls of the trapezoidal blocks. The driving component drives the sensor body to move in the vertical direction and simultaneously moves the trapezoidal blocks in the horizontal direction.

[0008] The cylindrical shell is fixedly installed at the concave part of the bottom of the electric cooker, and a protection component, a sensor body and a driving component are installed inside the cylindrical shell. The protection component is located at the upper part of the rectangular cavity, and the sensor body can be limited and moved in the middle part of the rectangular cavity. The driving component is arranged at the lower part of the rectangular cavity and connected with the sensor body. The sensor body is located directly below the inclined surface. When the electric cooker is not working, under the thrust of the protection spring, the side walls of the two trapezoidal blocks are fitted to completely cover the upper part of the sensor body. When the electric cooker is heating, the driving component drives the sensor body to move upward in the vertical direction. At the same time, the two trapezoidal blocks will be pushed to move to both sides, the protection spring will be compressed, the sensor will extend from the middle of the two trapezoidal blocks, contact the inner pot of the rice cooker to measure the temperature and humidity, and the sensor body will be protected when the rice cooker is not working. The sensor body will detect the temperature and humidity when the rice cooker is working to avoid the sensor body being exposed to water stains or kitchen waste. It also prevents boiling soup and rice grains and other foreign objects from overflowing when the rice cooker is cooking porridge or soup. Foreign objects block the detection surface of the sensor body, thereby affecting the normal operation of the sensor body, improving the accuracy of the sensor body in detecting temperature and humidity, and improving cooking effects and cooking safety.

[0009] Preferably, the driving component includes a driving spring and a pushing sleeve rod, the driving spring is made of memory metal material, the upper and lower ends of the driving spring are respectively connected to the bottom of the sensor body and the inner wall of the cylindrical shell, the driving spring extends when the set temperature is reached, the pushing sleeve rod is fixedly mounted on the sensor, the pushing sleeve rod is arranged in an I-shape, and the two ends of the pushing sleeve rod are symmetrical cylindrical rods, the cylindrical rod is located in the key-shaped through groove and slidably cooperates with the key-shaped through groove, and a cleaning component is arranged on the cylindrical shell, and the cleaning component cleans impurities on the upper surface of the sensor body.

[0010] The sensor body is connected to the inner bottom wall of the cylindrical shell by a driving spring, and a pushing sleeve rod is fixedly sleeved on the sensor. The cylindrical rods at both ends of the pushing rod pass through the two trapezoidal blocks respectively, and the cylindrical rods are located in the key-shaped through grooves. The width of the key-shaped through grooves is the same as the cross-sectional diameter of the cylindrical rods. When the electric rice cooker starts to heat up and the internal temperature of the electric rice cooker reaches the set temperature, the driving spring extends to apply an upward thrust to the sensor body, and the pushing sleeve rod fixedly connected to the sensor body moves upward at the same time. Since the key-shaped through groove is parallel to the inclined surface of the trapezoidal block, and the inclined surface of the trapezoidal block faces the sensor body, and the vertical surface is parallel to the inner wall of the rectangular cavity, due to the position restriction, the cylindrical rod and the key-shaped through groove slide relative to each other when the pushing sleeve rod moves upward, the two protection springs are compressed, and the side walls of the two trapezoidal blocks are no longer fitted, and the two trapezoidal blocks move upward. The sensor body moves away from both sides of the axis of the sensor body, and the sensor body extends from between the two trapezoidal blocks. When the internal temperature of the rice cooker is lower than the set temperature, the driving spring contracts, the sensor body and the pushing sleeve rod move downward at the same time, the cylindrical rod moves from the upper part to the lower part of the key-shaped through groove, the protection spring stretches, and the side walls of the two trapezoidal blocks fit together again under the thrust of the protection spring. The two trapezoidal blocks protect the sensor body, and the movement of the sensor body is controlled by temperature so that the sensor detection surface fits with the inner pot of the rice cooker for detection, thereby reducing the power equipment required for the mechanism, reducing the production cost, and improving the economy of the device. The protection of the sensor body by the trapezoidal blocks also avoids bumping when people move the rice cooker in daily life, causing the sensor body to be damaged by external forces, thereby improving the service life of the sensor body.

[0011] Preferably, the cleaning assembly includes a cleaning plate and a limiting column. A square groove is opened on the top of the cylindrical shell, and the square groove connects the rectangular cavity with the outside world. The cleaning plate is fixedly installed inside the cylindrical shell and is located below the square groove. The cleaning plate is made of bimetallic sheet, and the bottom surface of the cleaning plate is wrapped with soft rubber. The bottom surface of the cleaning plate is fitted with the upper surface of the trapezoidal block. The cleaning plate bends and deforms when the set temperature is reached. A limiting column is fixedly installed at the edge of the upper surface of the trapezoidal block, and the side wall of the cleaning plate is fitted with the limiting column.

[0012] A square groove is opened on the top of the cylindrical shell, and the cleaning component is located below the square groove. When the sensor body extends out of the rectangular cavity from the square groove, the cleaning component can scrape and clean the detection surface of the sensor body. The cleaning plate is made of bimetallic strips. Due to the different thermal expansion coefficients of the component layers of the bimetallic material, the layer with a higher expansion coefficient is called the active layer; the layer with a lower expansion coefficient is called the passive layer. When the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the bimetallic strip as a whole will bend toward the passive layer. The bottom surface of the cleaning plate is wrapped with soft rubber to increase the friction between the cleaning plate and the sensor body and improve the cleaning effect. When the rice cooker is not heated, the cleaning plate is parallel to the side wall of the square groove, and the side wall of the cleaning plate fits the limit column. When the electric rice cooker is heating and the internal temperature of the electric rice cooker reaches or exceeds the set temperature, the cleaning plate tends to bend and deform, but is restricted by the position of the limit column and the cleaning plate cannot bend and deform. When the sensor body extends from between the two trapezoidal blocks, the two trapezoidal blocks move to both sides away from the axis of the sensor body, and the limit column moves with the trapezoidal blocks. The limit column and the side wall of the cleaning plate slide relative to each other, and the limit column leaves the position restriction on the cleaning plate. When the detection surface of the sensor body moves to below the cleaning plate, the cleaning plate bends and deforms, and the bottom of the cleaning plate scrapes and cleans the sensor body to prevent kitchen waste from adhering to the surface of the sensor body and affecting the normal operation of the sensor body, thereby further improving the accuracy of the sensor body in detecting temperature and humidity.

[0013] Preferably, an L-shaped plate is fixedly mounted on the trapezoidal block, the area of ​​the L-shaped plate is the same as the upper surface area of ​​the trapezoidal block, the L-shaped plate is located between the square groove and the cleaning plate, and the L-shaped plate closes the square groove when the side walls of the trapezoidal block are fitted.

[0014] By installing an L-shaped plate on the upper surface of the trapezoidal block, the side walls of the L-shaped plate are also fitted when the side walls of the trapezoidal block are fitted under the thrust of the protective spring. The cleaning plate is fixedly installed on the cylindrical shell and is located between the upper surface of the trapezoidal block and the L-shaped plate. The side walls of the L-shaped plate fit together to block and close the square groove. At the same time, the L-shaped plate also protects the cleaning plate at its bottom. Only when the trapezoidal block moves will the L-shaped plate open the square groove to expose the cleaning plate, thereby preventing kitchen waste from falling into the top of the cylindrical shell, causing the cleaning plate to be contaminated, resulting in poor cleaning effect of the cleaning plate, and improving the cleaning effect of the cleaning component on the sensor body.

[0015] Preferably, a circular groove is provided on the upper surface of the cylindrical shell, and the cross-sectional area of ​​the circular groove is larger than that of the square groove. Two identical vertical grooves are symmetrically provided inside the cylindrical shell, and the two vertical grooves are perpendicular to the bottom surface of the cylindrical shell. The cylindrical rod is located inside the vertical groove and can move in the vertical direction to an upper limit, and the vertical groove is connected to the bottom of the circular groove. Two semicircular plates are symmetrically slidably installed in the circular groove, and the upper surfaces of the two semicircular plates are flush with the upper surface of the cylindrical shell. When the cylindrical rod moves upward, it pushes the semicircular plates to move in the vertical direction.

[0016] A circular groove is provided on the upper surface of a cylindrical shell, and two semicircular plates are slidably installed in the circular groove. When the electric rice cooker is heated and the internal temperature of the electric rice cooker reaches a set temperature, a driving spring is extended to drive a sensor body and a pushing sleeve rod to move upward, and the cylindrical rod gradually moves from the bottom of the vertical groove to the top of the vertical groove. When the cylindrical rod moves to the connecting part of the vertical groove and the circular groove, the cylindrical rod contacts the bottom of the semicircular plate, and the cylindrical rod pushes the semicircular plate vertically upward, so that the upper surfaces of the two semicircular plates are fitted with the bottom surface of the inner pot of the electric rice cooker. At this time, the two semicircular plates surround the extended sensor body, further protect the sensor body, avoid overflow of boiling soup and foreign matter such as rice grains when cooking porridge or soup, thereby preventing the normal operation of the sensor body from being affected, and improving the accuracy of the sensor body in detecting temperature and humidity.

[0017] Preferably, two identical sliding blocks are symmetrically arranged at the bottom of the trapezoidal block, a sliding groove is opened in the rectangular cavity, the sliding block is slidably matched with the sliding groove, and the sliding block is in the sliding groove to limit the movement of the trapezoidal block in the vertical direction.

[0018] By arranging a sliding block at the bottom of the trapezoidal block and opening a corresponding sliding groove in the rectangular cavity, a positioning guide is provided for the movement of the trapezoidal block. At the same time, the cooperation between the sliding block and the sliding groove limits the movement of the trapezoidal block in the vertical direction, thereby preventing the trapezoidal block from being subjected to an upward force when the cylindrical rod pushes the sliding block to both sides, causing the trapezoidal block to move upward, so that the protection component can work stably and the reliability of the equipment structure is improved.

[0019] Preferably, a cylindrical tube is vertically fixedly installed at the bottom of the rectangular cavity, the driving spring is located inside the cylindrical tube, one end of the cylindrical tube is sleeved on the bottom of the sensor body, the sensor body and the cylindrical tube are slidably matched, and the cylindrical tube limits the movement of the sensor body in the horizontal direction.

[0020] By vertically installing a cylindrical tube at the bottom of the rectangular cavity, the sensor body and the cylindrical tube are slidably matched, and the cylindrical tube limits the horizontal movement of the sensor body, avoiding the shaking that may occur when only the driving spring supports the sensor body, thereby improving the reliability of the equipment structure.

[0021] Preferably, a limiting groove is provided at the joint of the side walls of the two trapezoidal blocks, the limiting groove passes through the trapezoidal block, a long rod is provided on the opposite side of the limiting groove, the long rod is located above the key-shaped through groove, and the long rod is slidably matched with the limiting groove.

[0022] By arranging a long rod on the trapezoidal block to cooperate with the limit groove, the long rod and the limit groove slide relative to each other when the trapezoidal block moves in the horizontal direction. The long rod provides a guiding effect and limits the shaking of the trapezoidal block, thereby improving the working stability of the protection component.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By setting a protective component above the sensor body, the trapezoidal block covers the sensor body to prevent the sensor body from being exposed to water stains or the attachment of kitchen waste, and to prevent boiling soup and rice grains and other foreign objects from overflowing when cooking porridge or soup in the rice cooker. Foreign objects block the detection surface of the sensor body, thereby affecting the normal operation of the sensor body, improving the accuracy of the sensor body in detecting temperature and humidity, and improving the cooking effect and cooking safety.

[0025] 2. By setting a driving component under the sensor body and controlling the movement of the sensor body by temperature, the sensor detection surface is made to fit the inner pot of the rice cooker for detection, thereby reducing the power equipment required for the mechanism, reducing production costs, and improving the economy of the device. The protection of the sensor body by the trapezoidal block also avoids bumps when people move the rice cooker in daily life, causing the sensor body to be damaged by external forces, thereby increasing the service life of the sensor body.

[0026] 3. By setting a cleaning component on the cylindrical shell, the bottom of the cleaning plate is fitted with the upper surface of the trapezoidal block. When the trapezoidal block moves to both sides and the detection surface of the sensor body moves to the bottom of the cleaning plate, the cleaning plate bends and deforms, and the bottom of the cleaning plate scrapes and cleans the sensor body to prevent kitchen waste in the rice cooker pot from adhering to the surface of the sensor body and affecting the normal operation of the sensor body, thereby further improving the accuracy of the sensor body in detecting temperature and humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the present invention being installed inside an electric rice cooker;

[0028] Figure 2 It is a schematic diagram of the appearance structure of the present invention;

[0029] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0030] Figure 4 It is a schematic diagram of the vertical slot structure of the present invention;

[0031] Figure 5It is a cutaway front view of the present invention;

[0032] Figure 6 It is a schematic diagram of the slideway structure of the present invention;

[0033] Figure 7 It is a schematic diagram of the working of the cleaning component of the present invention;

[0034] Figure 8 It is a schematic diagram of the working of the sensor body of the present invention.

[0035] In the figure: 1. cylindrical shell; 101. rectangular cavity; 102. square groove; 103. circular groove; 104. vertical groove; 105. sliding groove; 2. sensor body; 3. protection assembly; 31. trapezoidal block; 311. key-type through groove; 312. L-shaped plate; 313. sliding block; 314. limiting groove; 315. long rod; 32. protection spring; 4. driving assembly; 41. driving spring; 42. pushing sleeve rod; 43. cylindrical rod; 5. rice cooker; 6. cleaning assembly; 61. cleaning plate; 62. limiting column; 7. semicircular plate; 8. cylindrical barrel. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "inside", "on", "fit", "bend", "surface", "vertical", "horizontal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] See also Figures 1 to 8 The present invention provides a temperature and humidity NTC sensor, and the technical solution is as follows:

[0039] The cylindrical shell 1 is fixedly installed at the central position of the bottom of the electric cooker 5, and the upper surface of the cylindrical shell 1 is lower than the lowest position of the bottom of the electric cooker 5. A rectangular cavity 101 is provided inside the cylindrical shell 1. A protection component 3, a sensor body 2, and a drive component 4 are installed inside the cylindrical shell 1. The protection component 3 is located at the upper part of the rectangular cavity 101. The sensor body 2 can be limited and moved in the middle of the rectangular cavity 101. The drive component 4 is arranged at the lower part of the rectangular cavity 101 and connected to the sensor body 2. The sensor body 2 is arranged inside the rectangular cavity 101. The drive component 4 is installed at the bottom of the rectangular cavity 101 and connected to the sensor body 2 bottom, the protection component 3 is installed in the rectangular cavity 101 and is located above the sensor body 2. The protection component 3 includes a trapezoidal block 31 and a protection spring 32. Two trapezoidal blocks 31 are symmetrically installed in the rectangular cavity 101. The inclined surface of the trapezoidal block 31 faces the bottom of the rectangular cavity 101. The sensor body 2 is located directly below the inclined surface. The side walls of the two trapezoidal blocks 31 are fitted together. The two trapezoidal blocks 31 are provided with a key-shaped through groove 311. The key-shaped through groove 311 runs through the entire trapezoidal block 31. The side wall of the key-shaped through groove 311 is parallel to the inclined surface of the trapezoidal block 31. Two protection springs are symmetrically installed horizontally in the rectangular cavity 101. The left and right ends of the two protective springs 32 are respectively connected to the inner wall of the cylindrical shell 1 and the side wall of the trapezoidal block 31. The driving component 4 drives the sensor body 2 to move in the vertical direction and moves the trapezoidal block 31 in the horizontal direction. When the electric rice cooker 5 is not working, under the thrust of the protective spring 32, the side walls of the two trapezoidal blocks 31 fit together to completely cover the upper part of the sensor body 2. When the electric rice cooker 5 is heating, the driving component 4 drives the sensor body 2 to move upward in the vertical direction. When the driving component 4 drives the sensor body 2 to move, it pushes the two trapezoidal blocks 31 to move to both sides. The protective springs 32 are used to push the sensor body 2 to move upward. 32 is compressed, and the sensor extends from the middle of the two trapezoidal blocks 31, contacts the inner pot of the rice cooker 5 to measure the temperature and humidity, and protects the sensor body 2 when the rice cooker 5 is not working. The sensor body 2 performs temperature and humidity detection when the rice cooker 5 is working, thereby preventing the sensor body 2 from being exposed to water stains or the attachment of kitchen waste and foreign objects, and preventing the boiling soup and rice grains and other foreign objects from overflowing when the rice cooker 5 is cooking porridge or soup. Foreign objects block the detection surface of the sensor body 2, thereby affecting the normal operation of the sensor body 2, thereby improving the accuracy of the sensor body 2 in detecting temperature and humidity, and improving the cooking effect and cooking safety.

[0040] As an embodiment of the present invention, refer to Figures 3 to 8The driving assembly 4 includes a driving spring 41 and a pushing sleeve rod 42. The driving spring 41 is made of a memory metal material. The transformation temperature of the memory metal material is set to 40°C. The upper and lower ends of the driving spring 41 are respectively connected to the bottom of the sensor body 2 and the inner wall of the cylindrical shell 1. The driving spring 41 extends when the set temperature is reached. The pushing sleeve rod 42 is fixedly sleeved on the sensor. The pushing sleeve rod 42 is set to an I-shape. The two ends of the pushing sleeve rod 42 are symmetrical cylindrical rods 43. The cylindrical rods 43 are located in the key-shaped through groove 311 and slide with the key-shaped through groove 311. A cleaning assembly 6 is provided on the cylindrical shell 1. The cleaning assembly 6 cleans impurities on the upper surface of the sensor body 2. The cylindrical rods 43 at both ends of the pushing rod pass through the two trapezoidal blocks 3 respectively. 1, and the cylindrical rod 43 is located in the key-shaped through groove 311, the width of the key-shaped through groove 311 is the same as the cross-sectional diameter of the cylindrical rod 43, when the electric cooker 5 starts heating and the internal temperature of the electric cooker 5 reaches the set temperature, the driving spring 41 stretches, applies an upward thrust to the sensor body 2, and the pushing sleeve rod 42 fixedly connected to the sensor body 2 moves upward at the same time, because the key-shaped through groove 311 is parallel to the inclined surface of the trapezoidal block 31, and the inclined surface of the trapezoidal block 31 faces the sensor body 2, and the vertical surface is parallel to the inner wall of the rectangular cavity 101, and is limited by the position, when the pushing sleeve rod 42 moves upward, the cylindrical rod 43 and the key-shaped through groove 311 slide relative to each other, the two protection springs 32 are compressed, and the side walls of the two trapezoidal blocks 31 are no longer fitted The two trapezoidal blocks 31 move to both sides away from the axis of the sensor body 2, and the sensor body 2 extends from between the two trapezoidal blocks 31. When the internal temperature of the rice cooker 5 is lower than the set temperature, the driving spring 41 contracts, and the sensor body 2 and the pushing sleeve rod 42 move downward at the same time. The cylindrical rod 43 moves from the upper part of the key-shaped through groove 311 to the lower part, and the protection spring 32 extends. The side walls of the two trapezoidal blocks 31 are fitted again under the thrust of the protection spring 32. The two trapezoidal blocks 31 protect the sensor body 2, and the movement of the sensor body 2 is controlled by temperature, so that the sensor detection surface is fitted with the inner pot of the rice cooker 5 for detection, reducing the power equipment required for the mechanism, reducing the production cost, and improving the economy of the device. The trapezoidal blocks 31 The protection of the sensor body 2 also prevents people from bumping into the electric rice cooker 5 when moving it in daily life, which causes the sensor body 2 to be damaged by external forces, thereby improving the service life of the sensor body 2; two identical sliding blocks 313 are symmetrically arranged at the bottom of the trapezoidal block 31, and a sliding groove 105 is provided in the rectangular cavity 101. The sliding block 313 and the sliding groove 105 are slidably matched, providing a positioning guide for the movement of the trapezoidal block 31. The cooperation between the sliding block 313 and the sliding groove 105 limits the movement of the trapezoidal block 31 in the vertical direction, thereby preventing the trapezoidal block 31 from being subjected to an upward component force when the cylindrical rod 43 pushes the sliding block 313 to both sides, causing the trapezoidal block 31 to move upward, so that the protection component 3 can work stably, and the reliability of the device structure is improved;A cylindrical tube 8 is vertically fixedly installed at the bottom of the rectangular cavity 101, and a driving spring 41 is located inside the cylindrical tube 8. One end of the cylindrical tube 8 is sleeved on the bottom of the sensor body 2. The sensor body 2 and the cylindrical tube 8 are slidably matched. The cylindrical tube 8 limits the movement of the sensor body 2 in the horizontal direction, so as to avoid the possibility of shaking when only the driving spring 41 is supported by the sensor body 2, thereby improving the reliability of the device structure; a limiting groove 314 is provided at the joint of the side wall of the trapezoidal block 31, and the limiting groove 314 runs through the trapezoidal block 31. A long rod 315 is provided on the opposite side of the limiting groove 314. The long rod 315 is located above the key-shaped through groove 311. The long rod 315 and the limiting groove 314 are slidably matched. When the trapezoidal block 31 moves in the horizontal direction, the long rod 315 and the limiting groove 314 slide relative to each other. The long rod 315 provides a guiding effect and limits the shaking of the trapezoidal block 31, thereby improving the working stability of the protection component 3. ;

[0041] As an embodiment of the present invention, refer to Figures 4 to 8The cleaning assembly 6 includes a cleaning plate 61 and a limiting column 62. A square groove 102 is provided on the top of the cylindrical shell 1. The square groove 102 connects the rectangular cavity 101 with the outside. The cleaning plate 61 is fixedly installed inside the cylindrical shell 1 and is located below the square groove 102. The cleaning plate 61 is made of a bimetallic sheet. The bottom surface of the cleaning plate 61 is wrapped with soft rubber. The bottom surface of the cleaning plate 61 is in contact with the upper surface of the trapezoidal block 31. The cleaning plate 61 is bent and deformed when the set temperature is reached. The limiting column 62 is fixedly installed at the edge of the upper surface of the trapezoidal block 31. The cleaning plate 61 is fixedly installed inside the cylindrical shell 1 and is located below the square groove 102. The cleaning plate 61 is made of a bimetallic sheet. The bottom surface of the cleaning plate 61 is wrapped with soft rubber. The bottom surface of the cleaning plate 61 is in contact with the upper surface of the trapezoidal block 31. 1 side wall is fitted with the limiting column 62. When the sensor body 2 extends out of the square slot 102 from the rectangular cavity 101, the cleaning component 6 can scrape and clean the detection surface of the sensor body 2. The cleaning plate 61 is made of a bimetallic sheet. Since the thermal expansion coefficients of the various component layers of the bimetallic material are different, the one with a higher expansion coefficient is called the active layer; the one with a lower expansion coefficient is called the passive layer. When the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the whole bimetallic sheet will bend toward the passive layer. The bottom surface of the cleaning plate 61 is wrapped with soft rubber. , increase the friction between the cleaning plate 61 and the sensor body 2, improve the cleaning effect, when the electric cooker 5 is not heated, the cleaning plate 61 is parallel to the side wall of the square groove 102, and the side wall of the cleaning plate 61 is in contact with the limiting column 62. When the electric cooker 5 is heated and the internal temperature of the electric cooker 5 reaches or exceeds the set temperature, the cleaning plate 61 tends to bend and deform, but is limited by the position of the limiting column 62, and the cleaning plate 61 cannot bend and deform. When the sensor body 2 extends from between the two trapezoidal blocks 31, the two trapezoidal blocks 31 are moved to Move away from the two sides of the axis of the sensor body 2, the limit column 62 moves with the trapezoidal block 31, the limit column 62 and the side wall of the cleaning plate 61 slide relative to each other, the limit column 62 leaves the position restriction of the cleaning plate 61, when the detection surface of the sensor body 2 moves below the cleaning plate 61, the cleaning plate 61 bends and deforms, and the bottom of the cleaning plate 61 scrapes and cleans the sensor body 2 to prevent kitchen waste from adhering to the surface of the sensor body 2 and affecting the normal operation of the sensor body 2, further improving the accuracy of the sensor body 2 in detecting temperature and humidity;The upper surface of the cylindrical shell 1 is provided with a circular groove 103, the cross-sectional area of ​​the circular groove 103 is larger than the area of ​​the square groove 102, and two identical vertical grooves 104 are symmetrically provided inside the cylindrical shell 1, and the two vertical grooves 104 are perpendicular to the bottom surface of the cylindrical shell 1, and the cylindrical rod 43 is located inside the vertical groove 104 and can move in the vertical direction. The vertical groove 104 is connected to the bottom of the circular groove 103, and two semicircular plates 7 are symmetrically slidably installed in the circular groove 103, and the upper surfaces of the two semicircular plates 7 are flush with the upper surface of the cylindrical shell 1, and the cylindrical rod 43 moves upward. When the electric cooker 5 is in the heating state, the semicircular plate 7 is pushed to move in the vertical direction. When the electric cooker 5 is heated and the internal temperature of the electric cooker 5 reaches the set temperature, the driving spring 41 is extended, driving the sensor body 2 and the pushing sleeve rod 42 to move upward, and the cylindrical rod 43 gradually moves from the bottom of the vertical groove 104 to the top of the vertical groove 104. When the cylindrical rod 43 moves to the connecting point of the vertical groove 104 and the circular groove 103, the cylindrical rod 43 contacts the bottom of the semicircular plate 7, and the cylindrical rod 43 pushes the semicircular plate 7 vertically upward, so that the upper surfaces of the two semicircular plates 7 are in contact with the bottom of the inner pot of the electric cooker 5. The two semicircular plates 7 surround the extended sensor body 2, further protecting the sensor body 2 to prevent boiling soup and rice grains and other foreign objects from overflowing when cooking porridge or soup, thereby affecting the normal operation of the sensor body 2 and improving the accuracy of the sensor body 2 in detecting temperature and humidity; an L-shaped plate 312 is fixedly mounted on the trapezoidal block 31, and the area of ​​the L-shaped plate 312 is the same as the upper surface area of ​​the trapezoidal block 31. When the side wall of the trapezoidal block 31 is in contact with the thrust of the protection spring 32, the side wall of the L-shaped plate 312 is also in contact with the cleaning plate 6. 1 is fixedly installed on the cylindrical housing 1, located between the upper surface of the trapezoidal block 31 and the L-shaped plate 312. The side wall of the L-shaped plate 312 is fitted to block and close the square groove 102. At the same time, the L-shaped plate 312 also protects the cleaning plate 61 at its bottom. Only when the trapezoidal block 31 moves, the L-shaped plate 312 will open the square groove 102 to expose the cleaning plate 61, so as to prevent kitchen waste from falling into the top of the cylindrical housing 1, causing the cleaning plate 61 to be contaminated, resulting in poor cleaning effect of the cleaning plate 61, and improving the cleaning effect of the cleaning component 6 on the sensor body 2. ;

[0042] Working principle: when the electric rice cooker 5 is not heating, the L-shaped plate 312 closes the square groove 102, the side walls of the trapezoidal block 31 fit together, and the sensor body 2 is located directly below the fitting of the side walls of the trapezoidal block 31. When the electric rice cooker 5 is heating and the internal temperature of the electric rice cooker 5 reaches the set temperature, the driving spring 41 extends, exerts an upward thrust on the sensor body 2, and the pushing sleeve rod 42 fixedly connected to the sensor body 2 moves upward at the same time. Since the key-shaped through groove 311 is parallel to the inclined surface of the trapezoidal block 31, and the inclined surface of the trapezoidal block 31 faces the sensor body 2, and the vertical surface is parallel to the inner wall of the rectangular cavity 101, the pushing sleeve rod 42 is limited by the position, and the cylindrical rod 43 slides relative to the key-shaped through groove 311 when moving upward, the two protection springs 32 are compressed, the side walls of the two trapezoidal blocks 31 are no longer fitted, and the two trapezoidal blocks 31 move to both sides away from the axis of the sensor body 2, and the cylindrical rod 43 gradually moves from the bottom of the vertical groove 104. Gradually move to the top of the vertical groove 104, when the cylindrical rod 43 moves to the connecting point of the vertical groove 104 and the circular groove 103, the cylindrical rod 43 contacts the bottom of the semicircular plate 7, and the cylindrical rod 43 pushes the semicircular plate 7 vertically upward. At this time, the two semicircular plates 7 surround the extended sensor body 2, and the sensor body 2 extends from between the two trapezoidal blocks 31. At this time, the cleaning plate 61 has a tendency to bend and deform, but is limited by the position of the limiting column 62, and the cleaning plate 61 cannot be bent and deformed. The limiting column 62 moves with the trapezoidal block 31, and the limiting column 62 and the side wall of the cleaning plate 61 slide relative to each other. The limiting column 62 leaves the position restriction on the cleaning plate 61. When the detection surface of the sensor body 2 moves below the cleaning plate 61, the cleaning plate 61 is bent and deformed, and the bottom of the cleaning plate 61 scrapes and cleans the sensor body 2. After cleaning, the sensor body 2 continues to move upward and finally fits with the inner pot of the rice cooker 5 to perform temperature and humidity detection.

[0043] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A temperature and humidity NTC sensor, characterized in that: The invention comprises a cylindrical shell (1), a sensor body (2), a protection component (3), and a drive component (4); the cylindrical shell (1) is fixedly mounted on the bottom of an electric rice cooker (5) and is located at a central depression of the electric rice cooker (5); a rectangular cavity (101) is provided inside the cylindrical shell (1); the sensor body (2) is arranged inside the rectangular cavity (101); the drive component (4) is mounted on the bottom of the rectangular cavity (101) and is connected to the bottom of the sensor body (2); the protection component (3) is mounted inside the rectangular cavity (101) and is located above the sensor body (2); the protection component (3) comprises a trapezoidal block (31) and a protection spring (32); two trapezoidal blocks (31) are symmetrically mounted inside the rectangular cavity (101); and the protection component (32) comprises a protective spring (32). 1), the inclined surface of the trapezoidal block (31) faces the bottom of the rectangular cavity (101), the side walls of the two trapezoidal blocks (31) are in contact with each other, the two trapezoidal blocks (31) are provided with key-shaped through grooves (311), the key-shaped through grooves (311) run through the entire trapezoidal block (31), the side walls of the key-shaped through grooves (311) are parallel to the inclined surface of the trapezoidal block (31), two protective springs (32) are symmetrically and horizontally installed inside the rectangular cavity (101), the left and right ends of the two protective springs (32) are respectively connected to the inner wall of the cylindrical shell (1) and the side wall of the trapezoidal block (31), and the driving component (4) drives the sensor body (2) to move in the vertical direction by using temperature changes as power, and simultaneously causes the trapezoidal block (31) to move in the horizontal direction.

2. A temperature and humidity NTC sensor according to claim 1, characterized in that: The driving assembly (4) comprises a driving spring (41) and a pushing sleeve rod (42). The driving spring (41) is made of a memory metal material. The upper and lower ends of the driving spring (41) are respectively connected to the bottom of the sensor body (2) and the inner wall of the cylindrical shell (1). The driving spring (41) extends when a set temperature is reached. The pushing sleeve rod (42) is fixedly sleeved on the sensor body (2). The pushing sleeve rod (42) is arranged in an I-shape. The two ends of the pushing sleeve rod (42) are symmetrical cylindrical rods (43). The cylindrical rods (43) are located in the key-shaped through groove (311) and are slidably matched with the key-shaped through groove (311). A cleaning assembly (6) is arranged on the cylindrical shell (1). The cleaning assembly (6) cleans impurities on the upper surface of the sensor body (2).

3. A temperature and humidity NTC sensor according to claim 2, characterized in that: The cleaning assembly (6) comprises a cleaning plate (61) and a limiting column (62). A square groove (102) is provided on the top of the cylindrical shell (1). The square groove (102) enables the rectangular cavity (101) to communicate with the outside. The cleaning plate (61) is fixedly installed inside the cylindrical shell (1) and is located below the square groove (102). The cleaning plate (61) is made of a bimetallic sheet. The bottom surface of the cleaning plate (61) is wrapped with soft rubber. The bottom surface of the cleaning plate (61) is in contact with the upper surface of the trapezoidal block (31). The cleaning plate (61) bends and deforms when a set temperature is reached. The limiting column (62) is fixedly installed at the edge of the upper surface of the trapezoidal block (31). The side wall of the cleaning plate (61) is in contact with the limiting column (62).

4. A temperature and humidity NTC sensor according to claim 3, characterized in that: An L-shaped plate (312) is fixedly mounted on the trapezoidal block (31), the area of ​​the L-shaped plate (312) being the same as the upper surface area of ​​the trapezoidal block (31), the L-shaped plate (312) being located between the square groove (102) and the cleaning plate (61), and the L-shaped plate (312) closing the square groove (102) when the side walls of the trapezoidal block (31) are in contact.

5. A temperature and humidity NTC sensor according to claim 2, characterized in that: The upper surface of the cylindrical shell (1) is provided with a circular groove (103), the cross-sectional area of ​​the circular groove (103) is larger than the area of ​​the square groove (102), the inside of the cylindrical shell (1) is symmetrically provided with two identical vertical grooves (104), the two vertical grooves (104) are perpendicular to the bottom surface of the cylindrical shell (1), the cylindrical rod (43) is located inside the vertical groove (104) and can move within a vertical limit position, the vertical groove (104) is connected to the bottom of the circular groove (103), two semicircular plates (7) are symmetrically slidably installed in the circular groove (103), the upper surfaces of the two semicircular plates (7) are flush with the upper surface of the cylindrical shell (1), and when the cylindrical rod (43) moves upward, it pushes the semicircular plates (7) to move in the vertical direction.

6. A temperature and humidity NTC sensor according to claim 5, characterized in that: Two identical sliding blocks (313) are symmetrically arranged at the bottom of the trapezoidal block (31), a sliding groove (105) is provided in the rectangular cavity (101), the sliding block (313) is slidably matched with the sliding groove (105), and the sliding block (313) is in the sliding groove (105) to limit the movement of the trapezoidal block (31) in the vertical direction.

7. A temperature and humidity NTC sensor according to claim 2, characterized in that: A cylindrical tube (8) is vertically fixedly installed at the bottom of the rectangular cavity (101), the driving spring (41) is located inside the cylindrical tube (8), one end of the cylindrical tube (8) is sleeved on the bottom of the sensor body (2), the sensor body (2) and the cylindrical tube (8) are slidably matched, and the cylindrical tube (8) limits the movement of the sensor body (2) in the horizontal direction.

8. A temperature and humidity NTC sensor according to claim 4, characterized in that: A limiting groove (314) is provided at the joint position of the side walls of the two trapezoidal blocks (31), the limiting groove (314) passes through the trapezoidal block (31), a long rod (315) is provided on the opposite side of the limiting groove (314), the long rod (315) is located above the key-shaped through groove (311), and the long rod (315) is slidably matched with the limiting groove (314).

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