A PTC heater with an automatic constant temperature function and its control system

Abstract

The present invention discloses a PTC heater with an automatic constant temperature function and its control system, including a casing and a protection system. It is characterized in that: two bottom plates are fixedly installed inside the casing by bolts, pillars are fixed above the two bottom plates, a plurality of heating plates are evenly fixed between the two pillars, a plurality of resistance bars are evenly fixed inside one of the pillars, and the plurality of resistance bars are all electrically connected to an external power supply and are in parallel. The plurality of heating plates are connected to the plurality of resistance bars through wires. A conductive needle is slidably connected to the resistance bar. A blower is arranged at one end of the casing, an air outlet is opened at the other end of the casing, a temperature sensor I and a timer are arranged inside the casing, and a temperature sensor II is arranged outside the casing. For the present invention, it is very necessary to design a PTC heater with an automatic constant temperature function and its control system that can automatically maintain a constant temperature and adjust the output power according to temperature changes.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, and particularly to a PTC heater with an automatic constant temperature function and its control system. Background Art

[0002] Due to the characteristics of small volume, fast heating, constant temperature, and energy saving, PTC electric heaters are widely used in air conditioners. The existing PTC electric heaters are mainly assembled by an aluminum tube with an internal heating element and a heating plate. As an auxiliary heating element, the PTC electric heater is placed inside the indoor unit of the air conditioner. However, traditional high-power PTC heaters generally use relay step control, which has problems such as large starting current and low power control accuracy; and the existing technology only realizes the control of the power of the PTC heater. When the indoor space temperature reaches the required value, it still continues to heat and needs to be manually stopped, with poor practicability. Therefore, it is very necessary to design a PTC heater with an automatic constant temperature function and its control system that can automatically maintain a constant temperature and adjust the output power according to temperature changes. Summary of the Invention

[0003] The purpose of the present invention is to provide a PTC heater with an automatic constant temperature function and its control system to solve the problems raised in the above background art.

[0004] To solve the above technical problems, the present invention provides the following technical solution: A PTC heater with an automatic constant temperature function and its control system, including a casing and a protection system, characterized in that: Two bottom plates are fixed inside the casing by bolts, pillars are fixed above the two bottom plates, a plurality of heating plates are evenly fixed between the two pillars, a plurality of resistance strips are evenly fixed inside one of the pillars, and the plurality of resistance strips are electrically connected to an external power supply and are in parallel. The plurality of heating plates are connected to the plurality of resistance strips through wires. A conductive needle is slidably connected to the resistance strip. A blower is provided at one end of the casing, an air outlet is provided at the other end of the casing, a temperature sensor one and a timer are provided inside the casing, and a temperature sensor two is provided outside the casing.

[0005] According to the above technical solution, one end of the upper end surface of the heating plate is provided with a telescopic rod, one end of the telescopic rod is fixed with a square plate, air holes are provided on the lower end surface of the square plate, a switching plate is slidably connected to the air holes, a small air extractor is provided inside the square plate, and a page door is provided on one side of the square plate.

[0006] According to the above technical solution, the control system includes a startup subsystem, a heating subsystem, and a protection subsystem

[0007] The promoter module is used to control the external power supply to the circuit connected by each resistor bar and the heating plate. The heating subsystem is used to heat up the space outside the casing. The protection subsystem is used to control the temperature inside the casing.

[0008] According to the above technical solution, the startup subsystem includes a voltage transformation and regulation module, the heating subsystem includes a recording module, and the protection subsystem includes a temperature regulation module;

[0009] The voltage transformation and regulation module is used to regulate the current supplied to the circuit connected by the resistor bar and the heating plate. The recording module is used to record the internal values of the casing. The temperature regulation module is used to control the heating temperature inside the casing.

[0010] According to the above technical solution, the voltage transformation and regulation module includes a telescopic sub-module, the recording module includes a temperature recording sub-module and a time recording sub-module, and the temperature regulation module includes a wind force regulation sub-module and a shutdown sub-module;

[0011] The telescopic sub-module is used to control the telescoping of the telescopic rod. The temperature recording sub-module is used to record the current temperature inside the casing. The time recording module is used to record the power supply time of the external power supply to the resistor bar. The wind force regulation sub-module is used to control the wind speed of the hot air discharged from the casing. The shutdown sub-module is used to stop the external power supply.

[0012] According to the above technical solution, the telescopic sub-module includes a primary cleaning unit, the time recording sub-module includes a guiding unit, the wind force regulation sub-module includes a calculation unit, and the shutdown sub-module includes a recycling unit and a secondary cleaning unit;

[0013] The primary cleaning unit is used to use a small air pump to absorb the dust accumulated on the surface of the heating plate through the air holes. The guiding unit is used to start the fan to discharge the heated air outside the casing. The calculation unit is used to calculate the current output power of the fan. The recycling unit is used to recycle the dust inside the square plate. The secondary cleaning unit is used to remove dust from the surface of the heating plate again during the process of shutdown reset and retraction of the telescopic rod.

[0014] According to the above technical solution, the specific operation steps of the control system are as follows:

[0015] S1: Start the external power supply to supply power to the circuit connected by the resistor bar and the heating plate;

[0016] S2: Start the telescopic rod to drive the square plate to move on the surface of the heating plate, and at the same time start a small air pump to extract the dust on the surface of the heating plate through the air holes to prevent affecting the heating efficiency;

[0017] S3: Start the timer and Temperature Sensor 1. As the power supply duration increases, record the temperature inside the cabinet at regular intervals, and this time interval can be set by the operator himself;

[0018] S4: As the power supply duration increases, adjust the sliding distance of the conductive needle on the surface of the resistance strip, reduce the resistance connected to the internal circuit, thereby increasing the current obtained by the heating plate and increasing the heating temperature;

[0019] S5: Start the fan to blow out the heated air;

[0020] S6: After heating is completed, stop the external power supply from powering the circuit. At this time, retract the telescopic rod, start the small suction machine again, remove the dust that has fallen on the surface of the heating plate during the heating process, and at the same time extract the preheating on the heating plate to avoid the heat remaining difficult to dissipate due to the small distance between the two heating plates, which affects the service life of the heating plate.

[0021] According to the above technical solution, step S5 further includes:

[0022] A1: When Temperature Sensor 1 detects that the temperature value at a certain time point is greater than or equal to the critical value, which can be set by the operator himself, increase the output power of the fan. The output power of the fan is proportional to the temperature detected by Temperature Sensor 1;

[0023] A2: Temperature Sensor 2 intermittently detects the external temperature value. The intermittent time is the same as that of Temperature Sensor 1. The sliding distance of the conductive needle on the surface of the resistance strip is proportional to the numerical difference between Temperature Sensors 1 and 2, that is, the smaller the temperature difference, the external temperature rises to meet the requirements, and at this time, there is no need to continue increasing the heating amount of the heating plate;

[0024] A3: The detected value of Temperature Sensor 2 is inversely proportional to the output power of the fan, that is, when the external temperature gradually rises, reduce the output power of the fan to meet the requirement of heating the air outside the cabinet while saving the power consumption of the fan;

[0025] A4: The numerical difference between Temperature Sensors 1 and 2 is proportional to the interval detection time, that is, the smaller the temperature difference between the two at this time, the closer the current temperature of the space outside the cabinet is to the set value, and reduce the interval detection time to ensure timely shutdown when the temperature of the space outside the cabinet reaches the set value.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: By setting up a cabinet and a control system, the present invention realizes heating the indoor space, controls the output power of the fan, maintains a constant temperature indoors, and adjusts in real time according to temperature changes, saving the use of the fan and the heating plate and improving the service life. Description of the Drawings

[0027] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0028] Figure 1 is a schematic diagram of the overall principle of the present invention;

[0029] Figure 2 is a schematic diagram of the modules of the present invention;

[0030] In the figure: 1, bottom plate; 2, support pillar; 3, heating plate. Detailed implementation manners

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figure 1-2 , the present invention provides a technical solution: a PTC heater with an automatic constant temperature function and its control system, including a casing and a protection system. It is characterized in that: two bottom plates 1 are fixed inside the casing by bolts, support pillars 2 are fixed above the two bottom plates 1, a plurality of heating plates 3 are evenly fixed between the two support pillars 2, a plurality of resistance strips are evenly fixed inside one of the support pillars 2, and the plurality of resistance strips are electrically connected to an external power supply and are in parallel. The plurality of heating plates 3 are connected to the plurality of resistance strips through wires. A conductive needle is slidably connected to the resistance strips. A blower is provided at one end of the casing, and an air outlet is provided at the other end of the casing. A temperature sensor 1 and a timer are provided inside the casing, and a temperature sensor 2 is provided outside the casing;

[0033] One end of the upper end surface of the heating plate 3 is provided with a telescopic rod, one end of the telescopic rod is fixed with a square plate, air holes are provided on the lower end surface of the square plate, an opening and closing plate is slidably connected to the air holes, a small air extractor is provided inside the square plate, and a page door is provided on one side of the square plate;

[0034] The control system includes a startup subsystem, a heating subsystem, and a protection subsystem

[0035] The startup sub-module is used to control the external power supply to supply power to the circuits connected to the respective resistance strips and heating plates. The heating subsystem is used to heat up the space outside the casing, and the protection subsystem is used to control the temperature inside the casing;

[0036] The startup subsystem includes a voltage transformation and regulation module, the heating subsystem includes a recording module, and the protection subsystem includes a temperature regulation module;

[0037] The variable voltage regulation module is used to regulate the current of the circuit connected to the regulating supply resistor bar and the heating plate. The recording module is used to record the internal values of the chassis. The temperature regulation module is used to control the heating temperature inside the chassis.

[0038] The variable voltage regulation module includes a telescoping sub-module. The recording module includes a temperature recording sub-module and a time recording sub-module. The temperature regulation module includes a wind force regulation sub-module and a shutdown sub-module.

[0039] The telescoping sub-module is used to control the telescoping of the telescopic rod. The temperature recording sub-module is used to record the current temperature inside the chassis. The time recording module is used to record the power supply time of the external power supply to the resistor bar. The wind force regulation sub-module is used to control the wind speed of the hot air discharged from the chassis. The shutdown sub-module is used to stop the power supply of the external power supply.

[0040] The telescoping sub-module includes a primary cleaning unit. The time recording sub-module includes a guiding unit. The wind force regulation sub-module includes a calculation unit. The shutdown sub-module includes a recycling unit and a secondary cleaning unit.

[0041] The primary cleaning unit is used to use a small air pump to absorb the dust accumulated on the surface of the heating plate through the air holes. The guiding unit is used to start the fan to discharge the heated air outside the chassis. The calculation unit is used to calculate the current output power of the fan. The recycling unit is used to recycle the dust inside the square plate. The secondary cleaning unit is used to clean the surface of the heating plate again during the shutdown reset and the process of the telescopic rod retracting.

[0042] The specific operation steps of the control system are as follows:

[0043] S1: Start the external power supply to supply power to the circuit connected to the resistor bar and the heating plate.

[0044] S2: Start the telescopic rod to drive the square plate to move on the surface of the heating plate. At the same time, start the small air pump to extract the dust on the surface of the heating plate through the air holes to prevent affecting the heating efficiency.

[0045] S3: Start the timer and temperature sensor 1. As the power supply duration increases, record the temperature inside the chassis at regular intervals. The time interval is set by the operator himself.

[0046] S4: As the power supply duration increases, adjust the sliding distance of the conductive needle on the surface of the resistor bar to reduce the resistance connected to the internal circuit, thereby increasing the current obtained by the heating plate and increasing the heating temperature.

[0047] S5: Start the fan to blow out the heated air.

[0048] S6: After the heating is completed, stop the external power supply from powering the circuit. At this time, retract the telescopic rod, start the small suction machine again, remove the dust that has fallen on the surface of the heating plate during the heating process, and at the same time extract the preheating on the heating plate, so as to avoid the difficulty of removing the residual heat due to the small distance between the two heating plates, which affects the service life of the heating plate;

[0049] Step S5 further includes:

[0050] A1: When the temperature sensor detects that the temperature value at a certain time point is greater than or equal to the critical value, which can be set by the operator himself, increase the output power of the fan. The output power of the fan is proportional to the temperature detected by the first temperature sensor;

[0051] A2: The second temperature sensor intermittently detects the external temperature value. The intermittent time is the same as that of the first temperature sensor. The sliding distance of the conductive needle on the resistance strip is proportional to the numerical difference between the first and second temperature sensors, that is, the smaller the temperature difference, the external temperature rises to the required level. At this time, there is no need to continue increasing the heating amount of the heating plate;

[0052] A3: The detection value of the second temperature sensor is inversely proportional to the output power of the fan, that is, when the external temperature gradually rises, reduce the output power of the fan to meet the requirement of heating the air outside the casing while saving the power consumption of the fan;

[0053] A4: The numerical difference between the first and second temperature sensors is proportional to the interval detection time, that is, the smaller the temperature difference between the two at this time, the closer the current temperature of the space outside the casing is to the set value, reduce the interval detection time, and ensure that when the space outside the casing reaches the set value, stop the machine in time.

[0054] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A PTC heater with an automatic constant temperature function, comprising a casing and a control system, characterized in that: Inside the casing, two bottom plates (1) are fixed by bolts. Above the two bottom plates (1), columns (2) are fixed. Between the two columns (2), a number of heating plates (3) are evenly fixed. Inside one of the columns (2), a number of resistance bars are evenly fixed. The number of resistance bars are all electrically connected to an external power supply in parallel. The number of heating plates (3) are connected to the number of resistance bars through wires. A conductive needle is slidably connected to the resistance bar. A blower is provided at one end of the casing, and an air outlet is provided at the other end of the casing. A first temperature sensor and a timer are provided inside the casing, and a second temperature sensor is provided outside the casing; One end of the upper end surface of the heating plate (3) is provided with a telescopic rod. One end of the telescopic rod is fixed with a square plate. Air holes are provided on the lower end surface of the square plate. An opening and closing plate is slidably connected to the air holes. A small air extractor is provided inside the square plate. A flap door is provided on one side of the square plate; The control system includes a startup subsystem, a heating subsystem, and a protection subsystem. The startup subsystem is used to control the external power supply to supply power to the circuits connected to the resistance bars and the heating plates. The heating subsystem is used to heat up the external space of the casing. The protection subsystem is used to control the temperature inside the casing; The startup subsystem includes a voltage regulation module. The heating subsystem includes a recording module. The protection subsystem includes a temperature regulation module; The voltage regulation module is used to regulate the current supplied to the circuits connected to the resistance bars and the heating plates. The recording module is used to record the internal values of the casing. The temperature regulation module is used to control the heating temperature inside the casing; The voltage regulation module includes a telescopic sub-module. The recording module includes a temperature recording sub-module and a time recording sub-module. The temperature regulation module includes a wind force regulation sub-module and a shutdown sub-module; The telescopic sub-module is used to control the telescoping of the telescopic rod. The temperature recording sub-module is used to record the current temperature inside the casing. The time recording sub-module is used to record the power supply time of the external power supply to the resistance bars. The wind force regulation sub-module is used to control the wind speed of the hot air discharged from the casing. The shutdown sub-module is used to stop the power supply of the external power supply.

2. The PTC heater with an automatic constant temperature function according to claim 1, wherein: The telescopic sub-module includes an initial cleaning unit. The time recording sub-module includes a guiding unit. The wind force regulation sub-module includes a calculation unit. The shutdown sub-module includes a recovery unit and a secondary cleaning unit; The initial cleaning unit is used to use the small air extractor to absorb the dust accumulated on the surface of the heating plate through the air holes. The guiding unit is used to start the blower to discharge the heated air outside the casing. The calculation unit is used to calculate the current output power of the blower. The recovery unit is used to recover the dust inside the square plate. The secondary cleaning unit is used to clean the surface of the heating plate again during the shutdown reset and the retraction of the telescopic rod.

3. The PTC heater with an automatic constant temperature function according to claim 2, characterized in that: The specific operation steps of the control system are as follows: S1: Start the external power supply to supply power to the circuits connected to the resistance bars and the heating plates; S2: Start the telescopic rod to drive the square plate to move on the surface of the heating plate. At the same time, start the small air pump to extract the dust on the surface of the heating plate through the air holes to prevent it from affecting the heating efficiency; S3: Start the timer and temperature sensor 1. As the power supply duration increases, record the temperature inside the machine shell at regular intervals. The time interval is set by the operator himself; S4: As the power supply duration increases, adjust the sliding distance of the conductive needle on the surface of the resistance strip to reduce the resistance connected to the internal circuit, thereby increasing the current obtained by the heating plate and increasing the heating temperature; S5: Start the fan to blow out the heated air; S6: After heating is completed, stop the external power supply to supply power to the circuit. At this time, retract the telescopic rod and start the small suction machine again to remove the dust that has fallen on the surface of the heating plate during the heating process. At the same time, extract the preheating on the heating plate to avoid the residual heat being difficult to dissipate due to the small distance between the two heating plates, which affects the service life of the heating plate.

4. The PTC heater with an automatic constant temperature function according to claim 3, characterized in that: The step S5 further includes: A1: When the temperature sensor 1 detects that the temperature value at a certain time point is greater than or equal to the critical value (the critical value can be set by the operator himself), increase the output power of the fan. The output power of the fan is proportional to the temperature detected by the temperature sensor 1; A2: The temperature sensor 2 intermittently detects the external temperature value. The intermittent time is the same as the intermittent detection time of the temperature sensor 1. The sliding distance of the conductive needle on the surface of the resistance strip is proportional to the numerical difference between the temperature sensors 1 and 2, that is, the smaller the temperature difference, the external temperature rises to meet the requirements. At this time, there is no need to continue increasing the heating amount of the heating plate; A3: The detected value of the temperature sensor 2 is inversely proportional to the output power of the fan, that is, when the external temperature gradually rises, reduce the output power of the fan to meet the requirement of heating the air outside the machine shell while saving the power consumption of the fan; A4: The numerical difference between the temperature sensors 1 and 2 is proportional to the interval detection time, that is, the smaller the temperature difference between the two at this time, the closer the current external temperature of the machine shell is to the set value. Reduce the interval detection time to ensure that when the external space of the machine shell reaches the set value, stop the machine in time.

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