Three-terminal flashing type adjustable temperature controller and application circuit thereof

Abstract

The utility model belongs to the technical field of temperature controllers, and discloses a three-terminal flashing type adjustable temperature controller and an application circuit thereof. A first ceramic ring, a first terminal, an upper reed, a second ceramic ring, a fixed contact piece, a metal welding piece, a mica pad, a second terminal, a third terminal, a third ceramic ring and a bimetallic strip are riveted together from top to bottom through a rivet on the left side of the bottom end of the installation panel, and a first heating wire and a second heating wire are arranged at the bottom end of the metal welding piece. And a ceramic ejector pin knob is arranged at the right end of the mounting panel. According to the utility model, through the arrangement of the first terminal, the second terminal and the third terminal, the same temperature controller can use two different kinds of heat to adapt to different temperature gears of the whole machine, the number of temperature controllers in the whole machine is reduced, the wiring amount is reduced, the labor cost and the material cost are greatly saved, and the production efficiency is improved. Different temperature control requirements of customers are met, and the performance of the whole machine of the customers is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of temperature controllers, and more specifically, relates to a three-terminal flashing adjustable temperature controller and an application circuit thereof. Background Art

[0002] Thermostats play a pivotal role in modern electronic devices. The core of thermostats is to sense changes in ambient temperature and generate corresponding actions through internal physical deformation to achieve automatic control. This deformation can accurately trigger special effects such as circuit conduction or disconnection, ensuring that the device is precisely controlled.

[0003] When we walk into the kitchen, the oven often becomes the key tool for cooking delicious food. The stability and accuracy of the temperature inside the oven are directly related to the cooking effect of the food. If the temperature is too high, the food may burn; if the temperature is too low, it is difficult to achieve the desired cooking effect. Therefore, the oven's thermostat is not only the key to ensuring food quality, but also the basis for achieving diversified cooking needs.

[0004] However, with the continuous expansion of the functions of modern ovens, a single thermostat can no longer meet the diverse cooking needs. Modern ovens usually need to have multiple functions such as upper tube heating, lower tube heating and hot air, and can be flexibly combined according to different ingredients and cooking needs. This requires at least two or more thermostats to control different heating elements separately to achieve precise temperature control. However, the use of multiple independent thermostats not only increases the production cost of the oven, but may also lead to operational complexity and reduced applicability. Users may need to adjust multiple thermostats separately to adapt to different cooking needs, which undoubtedly increases the difficulty of use.

[0005] To this end, the utility model provides a three-terminal flashing adjustable temperature controller and an application circuit thereof. Utility Model Content

[0006] The purpose of the utility model is to provide a three-terminal flashing adjustable temperature controller and its application circuit to solve the problems raised in the above background technology.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A three-terminal flashing adjustable thermostat, comprising a mounting panel, a first ceramic ring is arranged on the left side of the bottom end of the mounting panel, a first terminal is arranged on the bottom end of the first ceramic ring, an upper spring is connected to the bottom end of the first terminal, a lower spring is connected to the right side of the bottom end of the upper spring, a second ceramic ring is arranged on the left side of the bottom end of the upper spring, a fixed contact is connected to the bottom end of the second ceramic ring, a metal welding sheet is arranged on the bottom end of the fixed contact, a first heating wire and a second heating wire are arranged on the bottom end of the metal welding sheet, a second terminal is also arranged on the left side of the bottom end of the metal welding sheet, a third terminal is arranged on the bottom end of the second terminal, a third ceramic ring is arranged on the bottom end of the third terminal, and the bottom end of the third ceramic ring is connected to a bimetallic sheet;

[0009] A ceramic thimble knob is arranged at the right end of the mounting panel, the bottom end of the ceramic thimble knob is in contact with the upper spring sheet, and the ceramic thimble knob can realize self-rotation at a specific angle A, and the value range of A is 0°≤A≤320°.

[0010] As a further preferred technical solution of the present invention, the other end of the bimetallic strip is connected to one end of the vertical insulating column, and the other end of the vertical insulating column is connected to the other end of the lower spring sheet.

[0011] As a further preferred technical solution of the present invention, a mica pad is provided between the metal welding sheet and the second terminal, and a mica pad is also provided between the second terminal and the third terminal.

[0012] As a further preferred technical solution of the utility model, the first ceramic ring, the first terminal, the upper spring sheet, the second ceramic ring, the fixed contact sheet, the metal welding sheet, the mica pad, the second terminal, the third terminal, the third ceramic ring and the bimetallic sheet are riveted together from top to bottom by a rivet on the left side of the bottom end of the mounting panel.

[0013] As a further preferred technical solution of the present invention, the right end of the first heating wire is connected to the right side of the bottom end of the metal welding sheet, the left end of the first heating wire is connected to the bottom end of the mica pad arranged between the metal welding sheet and the second terminal, the right end of the second heating wire is connected to the right side of the bottom end of the metal welding sheet, and the bottom end of the mica pad arranged between the second terminal and the third terminal is connected.

[0014] As a further preferred technical solution of the utility model, the outer contour of the mounting panel is in a convex shape, a riveting circular hole for riveting is provided in the middle of the left side of the mounting panel, a mounting hole for installing a ceramic thimble knob is provided in the middle of the right side of the mounting panel, mounting end wings are bent at the front and rear of the right side of the mounting panel, mounting end wings are provided with mounting through holes, a limiting stop rod is also bent at the right side of the mounting panel, and the parameters of the adjustable thermostat are marked on the upper surface of the mounting panel.

[0015] As a further preferred technical solution of the utility model, a ceramic rod is provided at the bottom end of the ceramic thimble knob, the upper end of the ceramic rod is connected to the adjusting shaft, the lower end of the ceramic rod is directly abutted against the upper spring sheet, an adjusting screw is provided in the adjusting shaft, and a limiting ring is provided in the middle of the adjusting shaft.

[0016] As a further preferred technical solution of the utility model, the upper spring sheet is provided with an abutting portion, the abutting portion is provided with a pit, the pit abuts with the bottom end of the ceramic ejector knob, and the right end of the upper spring sheet is provided with a clamping through hole, and the clamping through hole of the upper spring sheet is used to clamp the vertical insulating column;

[0017] The right end of the bimetallic strip is also provided with a clamping hole, and the clamping hole of the bimetallic strip is used for clamping the vertical insulating column.

[0018] As a further preferred technical solution of the utility model, an energy storage spring is provided on the lower spring sheet, the right end of the energy storage spring is connected to the abutment portion of the upper spring sheet, a card connection hole is provided on the right end of the lower spring sheet, the card connection hole of the lower spring sheet corresponds to the card connection hole of the upper spring sheet, the card connection hole of the lower spring sheet is used to card the vertical insulating column, and a moving contact is provided on the left end of the lower spring sheet;

[0019] A static contact is arranged on the right end of the fixed contact piece.

[0020] An application circuit of a three-terminal flashing adjustable thermostat includes a three-terminal flashing adjustable thermostat, wherein a first terminal of the adjustable thermostat is electrically connected to a timer, the first terminal of the adjustable thermostat is also electrically connected to a first gear switch, and a second terminal of the adjustable thermostat is electrically connected to a second gear switch. Specifically, the second terminal of the adjustable thermostat is electrically connected to a connection point 2 of the second gear switch, the third terminal of the adjustable thermostat is electrically connected to a connection point 1 of the second gear switch, the third terminal of the adjustable thermostat is also electrically connected to an upper heating tube group, the second gear switch is electrically connected to a lower heating tube group, the first gear switch is also electrically connected to a shaded pole motor, the upper heating tube group, the lower heating tube group and the shaded pole motor are connected in parallel and electrically connected to a neutral line, the timer is also electrically connected to a carbon film resistor, the carbon film resistor is electrically connected to a neon lamp, and the timer is also connected to a live wire.

[0021] As described above, the three-terminal flashing adjustable thermostat and its application circuit provided by the utility model have the following beneficial effects:

[0022] 1. The utility model utilizes the above-mentioned three-terminal flashing adjustable thermostat and its application circuit. Due to the use of such a structure, through the setting of multiple terminals of the first terminal, the second terminal and the third terminal, the same thermostat can use two different heating to adapt to different temperature gears of the whole machine, reducing the number of thermostats in the whole machine, reducing the amount of wiring, greatly saving labor costs and material costs, meeting different temperature control requirements of customers, and improving the performance of customers' whole machines. .

[0023] 2. The utility model utilizes the above-mentioned three-terminal flashing adjustable thermostat and its application circuit. Due to the adoption of such a structure, the first heating wire and the second heating wire are arranged at the bottom of the metal welding sheet, so that the induced temperature of the thermostat can be compensated, so that when the ambient temperature of the thermostat is installed changes less or the thermostat is far away from the heating element, the temperature inside the oven can still be controlled more accurately.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a schematic diagram of the structure of a three-terminal flashing adjustable temperature controller applied for by the utility model;

[0027] Figure 2 A top view of a three-terminal flashing adjustable thermostat applied for by the utility model;

[0028] Figure 3 for Figure 2 Cross-section view in the AA direction;

[0029] Figure 4 It is a front view of a three-terminal flashing adjustable thermostat applied for by the utility model;

[0030] Figure 5 This is a left view of a three-terminal flashing adjustable thermostat applied for by the utility model;

[0031] Figure 6 This is the second structural schematic diagram of a three-terminal flashing adjustable temperature controller applied for by the utility model;

[0032] Figure 7 The utility model discloses an application circuit diagram of a three-terminal flashing adjustable temperature controller.

[0033] Summary of reference numerals and their descriptions:

[0034] 10. Installation panel; 11. Riveted round hole; 12. Installation hole; 13. Installation end wing; 14. Limit stopper; 20. First ceramic ring; 30. First terminal; 40. Upper spring; 41. Abutment portion; 50. Lower spring; 51. Energy storage spring; 52. Moving contact; 60. Second ceramic ring; 70. Fixed contact; 71. Static contact; 80. Metal welding sheet; 90. First heating wire; 100. Second heating wire; 110. Second terminal; 120. Third terminal; 130. Three ceramic rings; 140, bimetallic strip; 150, ceramic thimble knob; 151, ceramic rod; 152, adjusting shaft; 153, adjusting screw; 154, limit ring; 160, mica pad; 170, rivet; 180, timer; 190, first gear switch; 200, upper heating tube group; 210, lower heating tube group; 220, second gear switch; 230, shaded pole motor; 240, carbon film resistor; 250, neon lamp; 260, adjustable thermostat; 270, vertical insulating column. DETAILED DESCRIPTION

[0035] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that can be produced by the utility model and the purposes that can be achieved, should still fall within the scope of the technical content disclosed in this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of the implementation of this utility model. The specific structure can be described with reference to the drawings of the patent application.

[0037] The utility model provides a three-terminal flashing adjustable temperature controller and its application circuit. Figures 1 to 7As shown, the three-terminal flashing adjustable thermostat includes an installation panel 10, a first ceramic ring 20 is arranged on the left side of the bottom end of the installation panel 10, a first terminal 30 is arranged on the bottom end of the first ceramic ring 20, an upper spring sheet 40 is connected to the bottom end of the first terminal 30, a lower spring sheet 50 is connected to the right side of the bottom end of the upper spring sheet 40, a second ceramic ring 60 is arranged on the left side of the bottom end of the upper spring sheet 40, a fixed contact sheet 70 is connected to the bottom end of the second ceramic ring 60, a metal welding sheet 80 is arranged on the bottom end of the fixed contact sheet 70, a first heating wire 90 and a second heating wire 100 are arranged on the bottom end of the metal welding sheet 80, a second terminal 110 is also arranged on the left side of the bottom end of the metal welding sheet 80, a third terminal 120 is arranged on the bottom end of the second terminal 110, a third ceramic ring 130 is arranged on the bottom end of the third terminal 120, and the bottom end of the third ceramic ring 130 is connected to the bimetallic sheet 140;

[0038] A ceramic thimble knob 150 is disposed at the right end of the mounting panel 10 , the bottom end of the ceramic thimble knob 150 abuts against the upper spring sheet 40 , and the ceramic thimble knob 150 can realize a specific angle A rotation, and the value range of A is 0°≤A≤320°.

[0039] It should be noted that: the utility model realizes that the same thermostat can use two different heating modes to adapt to different temperature gears of the whole machine through the setting of multiple terminals of the first terminal 30, the second terminal 110 and the third terminal 120, which reduces the number of thermostats in the whole machine, reduces the amount of wiring, greatly saves labor costs and material costs, meets different temperature control requirements of customers, and improves the performance of customers' whole machines. .

[0040] Combination Figure 1 , Figure 3 , Figure 4 as well as Figure 6 As shown, the other end of the bimetallic strip 140 is connected to one end of the vertical insulating column 270 , and the other end of the vertical insulating column 270 is connected to the other end of the lower spring sheet 50 .

[0041] Combination Figure 1 , Figure 3 , Figure 4 as well as Figure 5 As shown, a mica pad 160 is disposed between the metal welding sheet 80 and the second terminal 110 , and a mica pad 160 is also disposed between the second terminal 110 and the third terminal 120 .

[0042] Combination Figures 1 to 7As shown, the left side of the bottom end of the mounting panel 10 is riveted together from top to bottom by a rivet 170 to connect the first ceramic ring 20, the first terminal 30, the upper spring sheet 40, the second ceramic ring 60, the fixed contact sheet 70, the metal welding sheet 80, the mica pad 160, the second terminal 110, the third terminal 120, the third ceramic ring 130 and the bimetallic strip 140.

[0043] Specifically, the specific structures of the first heating wire 90 and the second heating wire 100 are shown below. Figure 1 and Figure 6 As shown, in this embodiment, the right end of the first heating wire 90 is connected to the right side of the bottom end of the metal welding sheet 80, the left end of the first heating wire 90 is connected to the bottom end of the mica pad 160 provided between the metal welding sheet 80 and the second terminal 110, the right end of the second heating wire 100 is connected to the right side of the bottom end of the metal welding sheet 80, and the bottom end of the mica pad 160 provided between the second terminal 110 and the third terminal 120 is connected.

[0044] It should be noted that: the utility model provides a first heating wire 90 and a second heating wire 100 at the bottom of the metal welding sheet 80, which can compensate for the induced temperature of the thermostat, so that when the ambient temperature where the thermostat is installed changes little or the thermostat is far away from the heating element, the temperature inside the oven can still be controlled more accurately.

[0045] Specifically, the specific structure of the mounting panel 10 is shown below. Figure 1 , Figure 2 , Figure 5 as well as Figure 6 As shown, in the present embodiment, the outer contour of the mounting panel 10 is in a convex shape, a riveting circular hole 11 for riveting is provided in the middle of the left side of the mounting panel 10, a mounting hole 12 for installing a ceramic ejector knob 150 is provided in the middle of the right side of the mounting panel 10, mounting end wings 13 are bent at the front and rear of the right side of the mounting panel 10, and the mounting end wings 13 are provided with mounting through holes, and a limiting stop rod 14 is also bent at the right side of the mounting panel 10, and the parameters of the adjustable thermostat 260 are marked on the upper surface of the mounting panel 10.

[0046] Specifically, the specific structure of the ceramic ejector knob 150 is shown below. Figure 1 , Figure 2 as well as Figure 3 As shown, in this embodiment, a ceramic rod 151 is provided at the bottom end of the ceramic thimble knob 150, the upper end of the ceramic rod 151 is connected to the adjusting shaft 152, the lower end of the ceramic rod 151 is directly abutted against the upper spring sheet 40, an adjusting screw 153 is provided in the adjusting shaft 152, and a limiting ring 154 is provided in the middle of the adjusting shaft 152.

[0047] Specifically, the specific structures of the upper spring sheet 40 and the bimetallic sheet 140 are shown below. Figure 3 and Figure 4 As shown, in this embodiment, the upper spring piece 40 is provided with an abutting portion 41, and a pit is formed on the abutting portion 41, and the pit abuts against the bottom end of the ceramic ejector knob 150, and a clamping through hole is formed at the right end of the upper spring piece 40, and the clamping through hole of the upper spring piece 40 is used to clamp the vertical insulating column 270;

[0048] The right end of the bimetallic strip 140 also has a snap-in hole, and the snap-in hole of the bimetallic strip 140 is used to snap-in the vertical insulating column 270 .

[0049] Specifically, the specific structure of the lower spring sheet 50 and the fixed contact sheet 70 is shown below. Figure 4 As shown, in this embodiment, an energy storage spring 51 is provided on the lower spring 50, and the right end of the energy storage spring 51 is connected to the abutment portion 41 of the upper spring 40. A snap-in hole is provided on the right end of the lower spring 50, and the snap-in hole of the lower spring 50 corresponds to the snap-in hole of the upper spring 40. The snap-in hole of the lower spring 50 is used to snap-in the vertical insulating column 270, and a moving contact 52 is provided on the left end of the lower spring 50;

[0050] A static contact 71 is disposed on the right end of the fixed contact piece 70 .

[0051] An application circuit of a three-terminal flashing adjustable thermostat, combined with Figure 7 As shown, the three-terminal flashing adjustable thermostat 260 is included, the first terminal 30 of the adjustable thermostat 260 is electrically connected to the timer 180, the first terminal 30 of the adjustable thermostat 260 is also electrically connected to the first gear switch 190, the second terminal 110 of the adjustable thermostat 260 is electrically connected to the second gear switch 220, specifically, the second terminal 110 of the adjustable thermostat 260 is electrically connected to the connection point 2 of the second gear switch 220, the third terminal 120 of the adjustable thermostat 260 is electrically connected to the connection point 2 of the second gear switch 220 The connection point 1 is electrically connected, the third terminal 120 of the adjustable thermostat 260 is also electrically connected to the upper heating tube group 200, the second gear switch 220 is electrically connected to the lower heating tube group 210, the first gear switch 190 is also electrically connected to the shaded pole motor 230, the upper heating tube group 220, the lower heating tube group 210 and the shaded pole motor 230 are connected in parallel and electrically connected to the neutral line, the timer 180 is also electrically connected to the carbon film resistor 240, the carbon film resistor 240 is electrically connected to the neon lamp 250, and the timer 180 is also connected to the live wire.

[0052] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A three-terminal flashing adjustable thermostat, characterized in that: It comprises an installation panel, a first ceramic ring is arranged on the left side of the bottom end of the installation panel, a first terminal is arranged on the bottom end of the first ceramic ring, an upper spring is connected to the bottom end of the first terminal, a lower spring is connected to the right side of the bottom end of the upper spring, a second ceramic ring is arranged on the left side of the bottom end of the upper spring, a fixed contact is connected to the bottom end of the second ceramic ring, a metal welding sheet is arranged on the bottom end of the fixed contact, a first heating wire and a second heating wire are arranged on the bottom end of the metal welding sheet, a second terminal is also arranged on the left side of the bottom end of the metal welding sheet, a third terminal is arranged on the bottom end of the second terminal, a third ceramic ring is arranged on the bottom end of the third terminal, and the bottom end of the third ceramic ring is connected to the bimetallic sheet; A ceramic thimble knob is arranged at the right end of the mounting panel, the bottom end of the ceramic thimble knob is in contact with the upper spring sheet, and the ceramic thimble knob can realize self-rotation at a specific angle A, and the value range of A is 0°≤A≤320°.

2. A three-terminal flashing adjustable thermostat according to claim 1, characterized in that: The other end of the bimetallic strip is connected to one end of the vertical insulating column, and the other end of the vertical insulating column is connected to the other end of the lower spring sheet.

3. A three-terminal flashing adjustable thermostat according to claim 1, characterized in that: A mica pad is arranged between the metal welding sheet and the second terminal, and a mica pad is also arranged between the second terminal and the third terminal.

4. A three-terminal flashing adjustable thermostat according to claim 3, characterized in that: The first ceramic ring, the first terminal, the upper spring sheet, the second ceramic ring, the fixed contact sheet, the metal welding sheet, the mica pad, the second terminal, the third terminal, the third ceramic ring and the bimetallic sheet are riveted together from top to bottom by a rivet on the left side of the bottom end of the mounting panel.

5. A three-terminal flashing adjustable thermostat according to claim 3, characterized in that: The right end of the first heating wire is connected to the right side of the bottom end of the metal welding sheet, the left end of the first heating wire is connected to the bottom end of the mica pad arranged between the metal welding sheet and the second terminal, the right end of the second heating wire is connected to the right side of the bottom end of the metal welding sheet, and the bottom end of the mica pad arranged between the second terminal and the third terminal.

6. A three-terminal flashing adjustable thermostat according to claim 1, characterized in that: The outer contour of the mounting panel is in a convex shape, a riveting circular hole for riveting is provided in the middle of the left side of the mounting panel, a mounting hole for installing a ceramic ejector knob is provided in the middle of the right side of the mounting panel, mounting end wings are bent at the front and rear of the right side of the mounting panel, mounting end wings are provided with mounting through holes, a limit stop rod is also bent at the right side of the mounting panel, and the parameters of the adjustable thermostat are marked on the upper surface of the mounting panel.

7. A three-terminal flashing adjustable thermostat according to claim 1, characterized in that: A ceramic rod is arranged at the bottom end of the ceramic thimble knob, the upper end of the ceramic rod is connected to the adjustment shaft, the lower end of the ceramic rod is directly in contact with the upper spring sheet, an adjustment screw is arranged in the adjustment shaft, and a limit ring is arranged in the middle of the adjustment shaft.

8. A three-terminal flashing adjustable thermostat according to claim 2, characterized in that: The upper spring sheet is provided with an abutting portion, the abutting portion is provided with a pit, the pit abuts against the bottom end of the ceramic ejector knob, and the right end of the upper spring sheet is provided with a clamping through hole, the clamping through hole of the upper spring sheet is used to clamp the vertical insulating column; The right end of the bimetallic strip is also provided with a clamping hole, and the clamping hole of the bimetallic strip is used for clamping the vertical insulating column.

9. A three-terminal flashing adjustable thermostat according to claim 2 or 8, characterized in that: The lower spring sheet is provided with an energy storage spring sheet, the right end of which is connected to the abutment portion of the upper spring sheet, the right end of which is provided with a clamping through hole, the clamping through hole of the lower spring sheet corresponds to the clamping through hole of the upper spring sheet, the clamping through hole of the lower spring sheet is used for clamping the vertical insulating column, and the left end of the lower spring sheet is provided with a moving contact; A static contact is arranged on the right end of the fixed contact piece.

10. An application circuit of a three-terminal flashing adjustable thermostat, characterized in that: It includes a three-terminal flashing adjustable thermostat as described in any one of claims 1 to 9, wherein the first terminal of the adjustable thermostat is electrically connected to a timer, the first terminal of the adjustable thermostat is also electrically connected to a first gear switch, the second terminal of the adjustable thermostat is electrically connected to a second gear switch, specifically, the second terminal of the adjustable thermostat is electrically connected to a connection point 2 of the second gear switch, the third terminal of the adjustable thermostat is electrically connected to a connection point 1 of the second gear switch, the third terminal of the adjustable thermostat is also electrically connected to an upper heating tube group, the second gear switch is electrically connected to a lower heating tube group, the first gear switch is also electrically connected to a shaded pole motor, the upper heating tube group, the lower heating tube group and the shaded pole motor are connected in parallel and electrically connected to a neutral line, the timer is also electrically connected to a carbon film resistor, the carbon film resistor is electrically connected to a neon lamp, and the timer is also connected to a live wire.

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