CN217215952U - Drying equipment and heating element temperature protection system thereof - Google Patents
Drying equipment and heating element temperature protection system thereof Download PDFInfo
- Publication number
- CN217215952U CN217215952U CN202123441892.3U CN202123441892U CN217215952U CN 217215952 U CN217215952 U CN 217215952U CN 202123441892 U CN202123441892 U CN 202123441892U CN 217215952 U CN217215952 U CN 217215952U
- Authority
- CN
- China
- Prior art keywords
- temperature
- signal
- control
- rotating speed
- heating element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 89
- 238000001035 drying Methods 0.000 title claims abstract description 52
- 230000036760 body temperature Effects 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000011664 signaling Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 101100263704 Arabidopsis thaliana VIN3 gene Proteins 0.000 description 2
- 238000007602 hot air drying Methods 0.000 description 2
- 101100112673 Rattus norvegicus Ccnd2 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The utility model discloses a drying equipment and heat-generating body temperature protection system thereof. The heat-generating body temperature protection system includes: the temperature sensor is used for sensing the working temperature of a heating body of the drying equipment and sending a temperature signal to the control device; the rotating speed sensor is used for sensing the rotating speed of a fan in the drying equipment and sending a rotating speed signal to the control device; the whole machine power-off control circuit is coupled with a whole machine power supply device of the drying equipment and used for cutting off the power supply of the whole machine power supply device when receiving a whole machine power-off signal; the control device is used for controlling the rotation speed of the fan to increase when the temperature value corresponding to the temperature signal is greater than the preset temperature and the rotation speed value corresponding to the rotation speed signal is not zero; and when the rotating speed value corresponding to the rotating speed signal is zero and the temperature value corresponding to the temperature signal is greater than the preset temperature, outputting a complete machine power-off signal to a complete machine power-off control circuit. Adopt the utility model discloses, can improve the affiliated drying equipment's of heat-generating body operational reliability.
Description
Technical Field
The utility model relates to a control by temperature change technical field especially relates to a drying equipment and heat-generating body temperature protection system thereof.
Background
For some devices including a heating element, in order to ensure normal operation, it is generally necessary to monitor the temperature of the heating element and perform temperature protection. For example, in a dish sterilizer that dries by using a PTC heater and a blower, it is necessary to monitor the temperature of the PTC heater and protect the temperature.
In the prior art, temperature limiter and fuse link are adopted for temperature protection of the heating element, and the heating element is powered off when the PTC temperature exceeds the standard, so that the power is off when the temperature exceeds the standard, and the working reliability of equipment where the heating element is located is influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the working reliability of the equipment where the heating body is located in the prior art is low.
In order to solve the technical problem, the utility model provides a drying equipment and heat-generating body temperature protection system thereof.
A heating body temperature protection system of drying equipment comprises:
the temperature sensor is used for sensing the working temperature of a heating body of the drying equipment and sending a temperature signal to the control device;
the rotating speed sensor is used for sensing the rotating speed of a fan adjacent to the heating body in the drying equipment and sending a rotating speed signal to the control device;
the whole machine power-off control circuit is coupled with the whole machine power supply device of the drying equipment and used for cutting off the power supply of the whole machine power supply device when a whole machine power-off signal is received;
the control device is connected with the temperature sensor, the rotating speed sensor, the complete machine power-off control circuit and the fan and is used for acquiring the temperature signal and the rotating speed signal and controlling the rotating speed of the fan to increase when the temperature value corresponding to the temperature signal is higher than the preset temperature and the rotating speed value corresponding to the rotating speed signal is not zero; and when the rotating speed value corresponding to the rotating speed signal is zero and the temperature value corresponding to the temperature signal is greater than the preset temperature, outputting a complete machine power-off signal to the complete machine power-off control circuit.
In one embodiment, the complete machine power-off control circuit comprises a first relay and a first switch tube;
the controlled switch of the first relay is connected in series in a power supply loop of the complete machine power supply device, one end of a coil of the first relay is connected with input voltage, the other end of the coil of the first relay is connected with the input end of the first switch tube, the output end of the first switch tube is grounded, and the control end of the first switch tube is connected with the control device;
the control device outputs a complete machine power-off signal to the control end of the first switch tube to control the first switch tube to be cut off and the controlled switch of the first relay to be switched off.
In one embodiment, the complete machine power-off control circuit further comprises a first diode and a first capacitor, and the first diode and the first capacitor are connected in parallel to two ends of the coil of the first relay.
In one embodiment, the complete machine power-off control circuit further includes a first resistor, and the control end of the first switch tube is connected to the control device through the first resistor.
In one embodiment, the control device comprises a control chip, a first comparator and a second comparator;
the positive phase input end of the first comparator is connected with the temperature sensor and the first input end of the control chip, the negative phase input end of the first comparator is connected with input voltage, and the output end of the first comparator is connected with the second input end of the control chip;
the positive phase input end of the second comparator is connected with the input voltage, the negative phase input end of the second comparator is connected with the rotating speed sensor, and the output end of the second comparator is connected with the third input end of the control chip;
the first output end of the control chip is connected with the fan, and the second output end of the control chip is connected with the complete machine power-off control circuit.
In one embodiment, the system for protecting the temperature of the heating element further comprises a heating element power-off control circuit coupled with the heating element and connected with the control device, and the heating element power-off control circuit is used for cutting off power supply of the heating element when receiving a heating element power-off signal;
the control device is also used for outputting a heating element power-off signal to the heating element power-off control circuit when the rotating speed value corresponding to the rotating speed signal is zero and the temperature value corresponding to the temperature signal is less than or equal to the preset temperature.
In one embodiment, the heating element power-off control circuit comprises a second relay and a second switch tube;
the controlled switch of the second relay is connected in series in the power supply loop of the heating element, one end of a coil of the second relay is connected with input voltage, the other end of the coil of the second relay is connected with the input end of the second switch tube, the output end of the second switch tube is grounded, and the control end of the second switch tube is connected with the control device;
and the control device outputs a heating element power-off signal to the control end of the second switch tube to control the second switch tube to be cut off and the controlled switch of the second relay to be switched off.
In one embodiment, the heating element power-off control circuit further comprises a second resistor, and the control end of the second switching tube is connected with the control device through the second resistor.
The drying equipment comprises a heating body, a fan and the heating body temperature protection system, wherein the heating body is adjacent to the fan, and the heating body is connected with the fan.
In one embodiment, the heat-generating body is a PTC heat-generating body.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the temperature sensor is adopted to detect the working temperature of the heating element, the rotating speed sensor is adopted to detect the rotating speed of the fan, and when the detected temperature value is greater than the preset temperature and the rotating speed value is not zero, the rotating speed of the fan is increased to enlarge the air volume so as to reduce the temperature of the heating element without influencing the drying effect of the drying equipment; when the temperature value is greater than the preset temperature and the rotating speed value is zero, a complete machine power-off control circuit is adopted to power off a complete machine power supply device of the drying equipment, so that the drying equipment is powered off; therefore, the fan is adopted to adjust the air quantity to cool, and the complete machine power-off protection measure is adopted after the fan fails, so that the over-temperature protection can be realized under the condition that the hot air drying work is not influenced as much as possible, and the working reliability of the drying equipment to which the heating body belongs is improved.
Drawings
The scope of the present disclosure may be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings. Wherein the included drawings are:
FIG. 1 is a block diagram showing a protection system for the temperature of a heating element of a drying apparatus according to an embodiment;
FIG. 2 is a schematic circuit diagram of a control device in one embodiment;
FIG. 3 is a schematic circuit diagram of a protection system for a temperature of a heating element in one embodiment.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings and embodiments, and it is therefore right how to apply the technical means to solve the technical problems of the present invention, and the realization process to achieve the technical effects can be fully understood and implemented.
In one embodiment, a heating element temperature protection system of a drying device is provided, which can be used for carrying out over-temperature protection on a heating element of the drying device, for example, carrying out over-temperature protection on the heating element in a tableware disinfection machine with a drying function. As shown in fig. 1, the heating element temperature protection system of the drying device includes a temperature sensor 110, a rotation speed sensor 130, a complete machine power-off control circuit 150 and a control device 170. Wherein, the whole machine power-off control circuit 150 is coupled with the whole machine power supply device of the drying equipment; the control device 170 is connected with the temperature sensor 110, the rotating speed sensor 130, the complete machine power-off control circuit 150 and the fan of the drying equipment.
The temperature sensor 110 is used for sensing the working temperature of the heating body of the drying device and sending a temperature signal to the control device. The drying equipment comprises a heating body and a fan which are adjacently arranged, the heating body is used for generating heat, and air blown out of the fan passes through the heating body and then is discharged from an air outlet to be hot air. The temperature sensor may be disposed around the heating element, for example, in the case of a tableware sterilizer, the heating element is disposed in the temperature control box, and the temperature sensor may be disposed in the temperature control box together with the heating element.
The rotation speed sensor 130 is used for sensing the rotation speed of a fan adjacent to the heating element in the drying device and sending a rotation speed signal to the control device. Specifically, the rotation speed sensor 130 is disposed at a position where the rotation speed of the fan can be sensed.
The complete machine power-off control circuit 150 is used for cutting off the power supply of the complete machine power supply device when receiving a complete machine power-off signal. Wherein, the whole machine power-off signal is a signal for indicating the whole machine power-off of the drying equipment; the whole machine power supply device is a device for supplying power to the drying equipment, such as a heating element, a fan and the like of the drying equipment.
The control device 170 is configured to collect a temperature signal and a rotation speed signal, and control the rotation speed of the fan to increase when a temperature value corresponding to the temperature signal is greater than a preset temperature and a rotation speed value corresponding to the rotation speed signal is not zero; and when the rotating speed value corresponding to the rotating speed signal is zero and the temperature value corresponding to the temperature signal is greater than the preset temperature, outputting a complete machine power-off signal to a complete machine power-off control circuit. Wherein, predetermine the temperature and can set up according to actual demand. And if the rotating speed value corresponding to the rotating speed signal is zero, the blower is indicated to be in normal operation. When the sensed temperature value is higher than the preset temperature and the fan runs normally, the rotating speed of the fan is controlled to be increased, so that the air quantity is increased, and the heating body is cooled under the action of the fan; when the sensed temperature value is higher than the preset temperature and the fan is locked, the complete machine power-off control circuit is controlled to cut off the power supply of the complete machine power supply device, the temperature of the heating body is prevented from being too high, and over-temperature protection is realized.
Specifically, the control device 170 may control the rotation speed of the fan to increase by adjusting the voltage output to the fan. For example, if the rotation speed of the fan increases with an increase in voltage, the voltage output to the fan may be increased, thereby increasing the rotation speed of the fan.
According to the heating element temperature protection system of the drying equipment, the temperature sensor is used for detecting the working temperature of the heating element, the rotating speed sensor is used for detecting the rotating speed of the fan, when the detected temperature value is larger than the preset temperature and the rotating speed value is not zero, the rotating speed of the fan is increased to enlarge the air volume so as to reduce the temperature of the heating element, and the drying effect of the drying equipment is not influenced; when the temperature value is greater than the preset temperature and the rotating speed value is zero, a complete machine power-off control circuit is adopted to power off a complete machine power supply device of the drying equipment, so that the drying equipment is powered off; therefore, the fan is adopted to adjust the air quantity to cool, and the complete machine power-off protection measure is adopted after the fan fails, so that the over-temperature protection can be realized under the condition that the hot air drying work is not influenced as much as possible, and the working reliability of the drying equipment to which the heating body belongs is improved.
In one of the embodiments, the heat-generating body is a PTC heat-generating body; the preset temperature is the temperature corresponding to the maximum resistance value of the PTC heating element.
In one embodiment, referring to fig. 2, the control device 170 includes a control chip U1, a first comparator U2, and a second comparator U3.
A non-inverting input end of the first comparator U2 is connected with the temperature sensor and a first input end Vin1 of the control chip U1, an inverting input end of the first comparator U2 is connected with an input voltage, and an output end of the first comparator U2 is connected with a second input end Vin2 of the control chip U1; a non-inverting input end of the second comparator U3 is connected with the input voltage, an inverting input end of the second comparator U3 is connected with the rotation speed sensor, and an output end of the second comparator U3 is connected with a third input end Vin3 of the control chip U1; the first output end Vout3 of the control chip U1 is connected with the fan, and the second output end Vout2 of the control chip U1 is connected with the power-off control circuit 150 of the whole machine. As shown in fig. 3, the input voltage may be 12V, and the inverting input terminal of the first comparator U2 and the non-inverting input terminal of the second comparator U3 may be respectively connected to the input voltage 12V through resistors.
The control chip U1 can be a chip with digital-to-analog conversion and PWM pulse modulation, and can convert the value of the temperature signal sent by the temperature sensor into a temperature value, convert the temperature value into a rotational speed at which the temperature value is lower than a preset temperature by calculation, and output a corresponding voltage value by PWM pulse modulation to the fan from the port Vout 3. Specifically, the control chip U1 may be a BF7612CM series control chip.
In one embodiment, referring to fig. 3, the overall power-off control circuit 150 includes a first relay K2 and a first switch Q2. The controlled switch of the first relay K2 is connected in series in the power supply loop (the loop where the AC exists in fig. 3) of the complete machine power supply device, one end of the coil of the first relay K2 is connected to the input voltage, the other end of the coil is connected to the input end of the first switch tube Q2, the output end of the first switch tube Q2 is grounded, and the control end of the first switch tube Q2 is connected to the control device 170. Specifically, the input voltage may be 12V, and the control terminal of the first switch Q2 may be the second output terminal Vout2 of the control chip U1 connected to the control device 170.
The control device 170 outputs a complete machine power-off signal to the control end of the first switch tube Q2, and controls the first switch tube Q2 to be turned off and the controlled switch of the first relay K2 to be turned off, so that the power supply loop of the complete machine power supply device is cut off. The power-off signal of the whole device can be a level signal, for example, a low level signal, and the second output port Vout2 of the control chip U1 outputs the low level signal to the control terminal of the first switch Q2, controls the first switch Q2 to be turned off, and turns off the controlled switch of the first relay K2. Through adopting the relay control outage, even there is the condition that the fan became invalid, power-on generally can reset convenient to use after the outage.
In one embodiment, as shown in fig. 3, the complete machine power-off control circuit 150 further includes a first diode D2 and a first capacitor C2, and the first diode D2 and the first capacitor C2 are connected in parallel across the coil of the first relay K2.
Further, as shown in fig. 3, the complete power-off control circuit 150 may further include a first resistor R2, and the control terminal of the first switch Q2 is connected to the control device 170 through the first resistor R2.
In one embodiment, the above-mentioned protection system for temperature of heating element further comprises a heating element power-off control circuit 180 coupled to the heating element and connected to the control device 170, for cutting off power supply to the heating element when receiving the power-off signal of the heating element. The control device 170 is further configured to output a heating element power-off signal to the heating element power-off control circuit when the rotation speed value corresponding to the rotation speed signal is zero and the temperature value corresponding to the temperature signal is less than or equal to the preset temperature.
When the rotating speed sensor detects that the rotating speed value is zero, the default fan is locked, the heating body cannot work, the power of the heating body is cut off by adopting the power-off control circuit of the heating body, the power supply of the heating body is automatically cut off when the fan is locked, a self-protection measure of the heating body under the condition that the fan breaks down is provided, the heating body is prevented from burning due to dry burning, and the safety of the drying equipment is improved.
In one embodiment, with continued reference to fig. 3, the heater power-off control circuit 180 includes a second relay K1 and a second switching tube Q1; a controlled switch of the second relay K1 is connected in series in a power supply loop of a heating element (PTC in fig. 3), one end of a coil of the second relay K1 is connected with an input voltage, the other end of the coil is connected with an input end Q1 of the second switching tube, an output end of the second switching tube Q1 is grounded, and a control end of the second switching tube Q1 is connected with the control device 170. Specifically, the input voltage may be 12V, and the control terminal of the second switch Q1 may be the third output terminal Vout1 of the control chip U1 connected to the control device 170.
The control device 170 outputs a heater power-off signal to the control end of the second switching tube Q1, and controls the second switching tube Q1 to be turned off and the controlled switch of the second relay K1 to be turned off, so as to cut off the power supply of the heater. The heating element power-off signal can be a level signal, for example, a low level signal, and the third output port Vout3 of the control chip U1 outputs the low level signal to the control end of the second switching tube Q1, controls the second switching tube Q1 to be turned off, and turns off the controlled switch of the second relay K1. The relay is adopted to control the power failure, and the power-on can be reset generally after the power failure, so that the use is convenient.
In one embodiment, as shown in fig. 3, the heater power-off control circuit 180 further includes a second diode D1 and a second capacitor C1, and the second diode D1 and the second capacitor C1 are connected in parallel across the coil of the second relay K1.
Further, as shown in fig. 3, the heating element power-off control circuit 180 may further include a second resistor R1, and the control terminal of the second switch tube Q1 is connected to the control device 170 through the second resistor R1.
Taking fig. 3 as an example, the working principle is as follows: the L end of the 220V mains supply supplies power to the PTC and other loads of the drying equipment through the protective tube respectively. The power supply of the PTC is controlled by a second relay K1. When the control chip U1 normally works, the third output end Vout1 of the control chip U1 outputs high level, the triode Q1 is conducted, the second relay K1 is closed, and the PTC is electrified. When the speed sensor detects that the speed sensor is 0, the second comparator U3 can obtain a high level to VIN3, at the moment, the third output end Vout1 outputs a low level, the triode Q1 is cut off, the second relay K1 is turned off, and the PTC is powered off.
The N end of the 220V commercial power is connected to the GND end through a first relay K2. When the control chip U1 normally works, the second output end Vout2 of the control chip U1 outputs high level, the triode Q2 is conducted, the first relay K2 is closed, and the GND loop is conducted to normally supply power for all loads. When the rotating speed sensor detects that the rotating speed sensor is 0 and the temperature value exceeds the preset temperature, namely VIN2 and VIN3 are both high level, at the moment, the second output end Vout2 outputs a low level protection signal, the triode Q2 is cut off, the first relay K2 is turned off, the GND loop is cut off, the whole machine power supply device of the drying equipment is powered off, and all loads stop working. After the power is supplied again, the control chip U1 is reset and works normally again.
In one embodiment, a drying device is provided, which comprises a heating element, a fan and the heating element temperature protection system in the above embodiment, wherein the heating element is arranged adjacent to the fan, and the heating element and the fan are connected with the heating element temperature protection system.
In one of the embodiments, the heat-generating body is a PTC heat-generating body.
The heating body (PTC) and the temperature sensor can be arranged in the temperature control box, on one hand, the closed space is provided for storing heat, and on the other hand, the heating body is isolated from other electrical appliances to ensure safety. The temperature control box is provided with an air inlet and an air outlet, the fan blades rotate to guide air from the air inlet into the temperature control box and discharge the air from the air outlet, and hot air can be blown for drying. In particular, the drying apparatus may be a dish sterilizer.
The drying equipment adopts the heating element temperature protection system, and similarly, the over-temperature protection of the drying equipment can be realized, and the working reliability is improved.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Although the embodiments of the present invention have been disclosed, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be apparent to persons skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a drying equipment's heat-generating body temperature protection system which characterized in that includes:
the temperature sensor is used for sensing the working temperature of a heating body of the drying equipment and sending a temperature signal to the control device;
the rotating speed sensor is used for sensing the rotating speed of a fan adjacent to the heating body in the drying equipment and sending a rotating speed signal to the control device;
the whole machine power-off control circuit is coupled with a whole machine power supply device of the drying equipment and used for cutting off the power supply of the whole machine power supply device when a whole machine power-off signal is received;
the control device is connected with the temperature sensor, the rotating speed sensor, the complete machine power-off control circuit and the fan and is used for acquiring the temperature signal and the rotating speed signal and controlling the rotating speed of the fan to increase when the temperature value corresponding to the temperature signal is higher than the preset temperature and the rotating speed value corresponding to the rotating speed signal is not zero; and when the rotating speed value corresponding to the rotating speed signal is zero and the temperature value corresponding to the temperature signal is greater than the preset temperature, outputting a complete machine power-off signal to the complete machine power-off control circuit.
2. The system of claim 1, wherein the complete machine power-off control circuit comprises a first relay and a first switch tube;
the controlled switch of the first relay is connected in series in a power supply loop of the complete machine power supply device, one end of a coil of the first relay is connected with input voltage, the other end of the coil of the first relay is connected with the input end of the first switch tube, the output end of the first switch tube is grounded, and the control end of the first switch tube is connected with the control device;
the control device outputs a complete machine power-off signal to the control end of the first switch tube to control the first switch tube to be cut off and the controlled switch of the first relay to be switched off.
3. The system of claim 2, wherein the power-off complete machine control circuit further comprises a first diode and a first capacitor, and the first diode and the first capacitor are connected in parallel across the coil of the first relay.
4. The system of claim 2, wherein the complete machine power-off control circuit further comprises a first resistor, and a control end of the first switch tube is connected to the control device through the first resistor.
5. The system of claim 1, wherein the control device comprises a control chip, a first comparator and a second comparator;
the positive phase input end of the first comparator is connected with the temperature sensor and the first input end of the control chip, the negative phase input end of the first comparator is connected with input voltage, and the output end of the first comparator is connected with the second input end of the control chip;
the positive phase input end of the second comparator is connected with the input voltage, the negative phase input end of the second comparator is connected with the rotating speed sensor, and the output end of the second comparator is connected with the third input end of the control chip;
the first output end of the control chip is connected with the fan, and the second output end of the control chip is connected with the complete machine power-off control circuit.
6. The system as claimed in any one of claims 1 to 5, further comprising a heater power-off control circuit coupled to the heater and connected to the control means, for cutting off power supply to the heater upon receiving a heater power-off signal;
the control device is also used for outputting a heating element power-off signal to the heating element power-off control circuit when the rotating speed value corresponding to the rotating speed signal is zero and the temperature value corresponding to the temperature signal is less than or equal to the preset temperature.
7. The system according to claim 6, wherein the heat-generating body power-off control circuit includes a second relay and a second switching tube;
the controlled switch of the second relay is connected in series in the power supply loop of the heating element, one end of a coil of the second relay is connected with input voltage, the other end of the coil of the second relay is connected with the input end of the second switch tube, the output end of the second switch tube is grounded, and the control end of the second switch tube is connected with the control device;
and the control device outputs a heating element power-off signal to the control end of the second switch tube to control the second switch tube to be cut off and the controlled switch of the second relay to be switched off.
8. The system of claim 7, wherein the heating element power-off control circuit further comprises a second resistor, and the control end of the second switch tube is connected with the control device through the second resistor.
9. A drying apparatus, comprising a heating element, a fan, and the heating element temperature protection system of any one of claims 1 to 8, wherein the heating element is disposed adjacent to the fan, and the heating element and the fan are connected to the heating element temperature protection system.
10. The drying apparatus as set forth in claim 9, wherein the heat-generating body is a PTC heat-generating body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123441892.3U CN217215952U (en) | 2021-12-30 | 2021-12-30 | Drying equipment and heating element temperature protection system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123441892.3U CN217215952U (en) | 2021-12-30 | 2021-12-30 | Drying equipment and heating element temperature protection system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217215952U true CN217215952U (en) | 2022-08-16 |
Family
ID=82788910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123441892.3U Active CN217215952U (en) | 2021-12-30 | 2021-12-30 | Drying equipment and heating element temperature protection system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217215952U (en) |
-
2021
- 2021-12-30 CN CN202123441892.3U patent/CN217215952U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100443009C (en) | Improved personal care device with thermal feedback and operating state display | |
| US8680440B2 (en) | Control circuit for controlling heating element power | |
| US6646237B2 (en) | Safety control circuit for electric water heater | |
| CN207279793U (en) | A kind of wind heater device with overtemperature protection | |
| KR101065482B1 (en) | Electric heating controller with safety device | |
| CN217215952U (en) | Drying equipment and heating element temperature protection system thereof | |
| CN201407746Y (en) | Air conditioner with electric heater protection circuit | |
| CN211554767U (en) | Vehicle-mounted equipment overheating protection circuit | |
| CN215672814U (en) | Power supply circuit capable of preventing overheating damage and adjusting rotating speed of fan | |
| CN215601022U (en) | Electronic equipment and over-temperature protection circuit thereof | |
| CN205316916U (en) | Drying apparatus suitable for chinese -medicinal material | |
| CN105353703B (en) | Temperature and humidity control circuit based on temperature humidity protection | |
| CN201171156Y (en) | Control integrated circuit for over temperature protection | |
| CN113346454A (en) | Over-temperature protection circuit | |
| CN209488827U (en) | A kind of overtemperature protection system of PTC heater | |
| KR100803511B1 (en) | Temperature controller and temperature control method | |
| CN209462009U (en) | A kind of temperature protection circuit of grass trimmer batteries in parallel connection packet | |
| CN208351349U (en) | Self-heating electric appliance | |
| CN211510821U (en) | Hair drier capable of outputting hot air with different temperatures according to seasons | |
| CN113556832A (en) | Safe heat supply circuit and electric blanket with same | |
| CN111103909A (en) | Electric hair drier circuit board temperature control circuit and method | |
| CN220962252U (en) | Temperature detection control circuit suitable for kettle | |
| CN200962671Y (en) | Electrothermal blanket automatic control device | |
| CN205725647U (en) | A kind of Intelligent photovoltaic array header box | |
| CN209131005U (en) | A kind of fan heater control circuit based on RC temperature detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |