CN105350272B - A kind of dryer and its drying control method using Far-infrared Heating - Google Patents

Abstract

The invention relates to the field of clothes dryers, in particular to a clothes dryer using far-infrared heating and a clothes drying control method thereof. The clothes dryer using far-infrared heating includes a drying drum, and also includes at least one far-infrared heater, a humidity sensor for detecting the exhaust humidity of the drying drum, a relay and a controller whose output end is connected to the relay, and all remote The infrared heater is connected to the power supply through the relay, and a first temperature sensor is installed inside one of the far-infrared heaters, and the first temperature sensor and the humidity sensor are connected to the input of the controller, so The controller controls the opening and closing of the relay according to the received temperature signal or humidity signal. The above control system simplifies the circuit and saves the cost.

Description

A clothes dryer using far-infrared heating and its drying control method

technical field

The invention relates to the field of clothes dryers, in particular to a clothes dryer using far-infrared heating and a clothes drying control method thereof.

Background technique

In the prior art, some clothes dryers or all-in-one washing and drying machines use far-infrared heating technology to dry clothes. Infrared heater, far-infrared heater can emit far-infrared rays, and far-infrared rays have the energy characteristics of being absorbed by water but not by air, so far-infrared rays irradiate the inside of the drying drum and are absorbed by the moisture in the heated object, and are directly converted into heat energy. The moisture in the heated object is converted into water vapor and discharged.

However, the existing clothes dryer or all-in-one washing and drying machine adopts far-infrared heating technology, and generally controls the on-off of a group of far-infrared heaters by being arranged on a relay on a PCB (Printed Circuit Board) printed circuit board. A thermostat is installed near each far-infrared heater to prevent the temperature of the far-infrared heater from being too high, and a temperature sensor is set in the drying drum to control the temperature in the barrel not to exceed the standard. Therefore, using the existing far-infrared heating control method, each far-infrared heater needs to be equipped with a relay and a thermostat for control, and multiple sets of relays and thermostats need to be installed in the entire clothes dryer or all-in-one washing and drying machine. Cumbersome and costly.

The far-infrared heater adopts TCM material. TCM (Tin Ceramic Membrane) is a new functional ceramic composite electric heating material. It is characterized in that electric energy is converted into heat energy and then converted into far-infrared rays. Far-infrared rays are the first, energy-saving, and cutting-edge high-tech new products in the field of electric heating. The thermal efficiency reaches 92%, which saves electricity by 20%-30% compared with conventional electric heating elements. As a clean energy source, it fully meets environmental protection requirements. When the far-infrared heater is used on a clothes dryer or an all-in-one washing and drying machine to dry clothes, because the power density of the far-infrared heater is relatively low, a relatively large heating area is required. The existing far-infrared heater is generally single-chip The power is between 200-400W, taking an ordinary 5kg clothes dryer as an example, at least 3-6 pieces of far-infrared heaters are needed. If the existing heating control method is adopted, each far-infrared heater needs to be equipped with a relay and a thermostat, that is, 3-6 groups of relays and thermostats, and the wiring is cumbersome and costly.

Based on the above description, there is an urgent need for a new far-infrared clothes drying control system to solve the problem of cumbersome control system circuits and waste of cost in the prior art.

Contents of the invention

In view of this, the object of the present invention is to provide a clothes dryer using far-infrared heating, which only needs to be equipped with a relay and a temperature controller to monitor all the far-infrared heaters, which simplifies the circuit and also Cost savings.

Another object of the present invention is to provide a method for controlling a clothes dryer using far-infrared heating. The method is applied to the above-mentioned clothes dryer using far-infrared heating. The control method is simple and easy to operate.

Embodiments of the present invention adopt the following technical solutions:

A clothes dryer using far-infrared heating, including a drying drum, and at least one far-infrared heater, a humidity sensor for detecting the exhaust humidity of the drying drum, a relay, and a controller whose output terminal is connected to the relay , all far-infrared heaters are connected to the power supply through the relay, wherein a first temperature sensor is installed inside one of the far-infrared heaters, and the first temperature sensor and the humidity sensor are connected to the input end of the controller connected, the controller controls the opening and closing of the relay according to the received temperature signal or humidity signal.

Preferably, at least one second temperature sensor for detecting the temperature inside the drying drum is further included, and the second temperature sensor is connected to the input terminal of the controller.

Preferably, the second temperature sensor is arranged at the air outlet of the clothes dryer.

Preferably, the humidity sensor is arranged at the air outlet of the clothes dryer.

Preferably, a fan is provided at the air inlet of the washing machine, and the power of the fan is 10 watts to 20 watts; the fan is connected to the controller.

Preferably, the drying cylinder is provided with an installation hole, and the far-infrared heater is installed in the installation hole to heat the inside of the drying cylinder.

Preferably, at least one set of hole arrays is provided on the drying drum, and each set of hole arrays is composed of a plurality of holes, and the far-infrared heater is arranged outside the hole arrays, and through the hole arrays The inside of the drying drum may be heated.

A method for controlling a clothes dryer using far-infrared heating, applied to the clothes dryer using far-infrared heating described in item 1, comprising the steps of:

S11. The first temperature sensor detects the temperature in the far-infrared heater and transmits it to the controller in the form of a signal, and at the same time, the humidity sensor detects the humidity of the gas in the drying drum and transmits it to the controller in the form of a signal;

S12. The controller compares the received humidity value with the preset humidity value, and when the humidity value is greater than the preset humidity value, execute step S14; when the humidity value is less than or equal to the preset humidity value, execute step S13;

S13, the controller controls the relay to be in the disconnected state;

S14. The controller compares the received temperature in the far-infrared heater with the preset upper limit temperature Tmax1 and the preset lower limit temperature Tmin1. When the temperature in the far-infrared heater is greater than the preset upper limit temperature Tmax1, step S13 is executed; When the temperature in the far-infrared heater is lower than the preset lower limit temperature Tmin1, step S15 is executed;

S15. The controller controls the relay to be in a closed state.

A method for controlling a clothes dryer using far-infrared heating, which is applied to the clothes dryer using far-infrared heating described in the second item, comprising the steps of:

S21. The first temperature sensor detects the temperature in the far-infrared heater and transmits it to the controller in the form of a signal. The humidity sensor detects the humidity of the gas in the drying drum and transmits it to the controller in the form of a signal. At the same time, the second temperature sensor detects The temperature in the drying drum is transmitted to the controller in the form of a signal;

S22. The controller compares the received humidity value with the preset humidity value, and when the humidity value is greater than the preset humidity value, execute step S24; when the humidity value is less than or equal to the preset humidity value, execute step S23;

S23, the controller controls the relay to be in a disconnected state;

S24. The controller compares the received temperature in the far-infrared heater with the preset upper limit temperature Tmax1 and the preset lower limit temperature Tmin1, and compares the received temperature in the drying drum with the preset upper limit temperature Tmax2 and the preset The lower limit temperature Tmin2 is compared, when the temperature in the far-infrared heater is greater than the preset upper limit temperature Tmax1, and the temperature in the drying drum is greater than the preset upper limit temperature Tmax2, at least one of them is satisfied, step S23 is executed; when the temperature in the far-infrared heater When the temperature is lower than the preset lower limit temperature Tmin1 and the temperature in the drying drum is lower than the preset lower limit temperature Tmin2 and at least one of them is satisfied, step S25 is executed;

S25. The controller controls the relay to be in a closed state.

The beneficial technical effect of the technical solution proposed by the embodiment of the present invention is: since all far-infrared heaters are connected to the power supply through a relay, that is, through a relay to control the opening and closing of all relays, a first far-infrared heater is installed inside one of them. The temperature sensor, the first temperature sensor and the humidity sensor for detecting the exhaust humidity of the drying drum are connected to the controller, and the controller controls the opening and closing of the relay according to the received temperature signal or humidity signal. Therefore, the above control system simplifies the circuit and saves the cost.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to the content of the embodiment of the present invention and these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a far-infrared clothes drying control system provided by an embodiment of the device of the present invention;

Fig. 2 is a flow chart of the drying control method provided by the method embodiment of the present invention;

Fig. 3 is a flow chart of a preferred mode of the clothes drying control method provided by the method embodiment of the present invention.

In the picture:

1. Far-infrared heater; 2. Controller; 3. Relay; 4. Power supply; 5. First temperature sensor; 6. Humidity sensor; 7. Second temperature sensor; 8. Fan.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only the technical solutions of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

Device embodiment

The far-infrared heater provided in this application can be applied to both an integrated washer-dryer and a clothes dryer. The clothes dryer is taken as an example for introduction below. The clothes dryer includes a box body and a far-infrared clothes drying control system, the far-infrared clothes drying control system includes a clothes drying drum, and the clothes drying drum is rotatably arranged inside the box body. Fig. 1 is a schematic structural diagram of a far-infrared clothes drying control system provided by an embodiment of the device of the present invention. As shown in Figure 1, the far-infrared drying control system also includes at least one far-infrared heater 1, a humidity sensor 6 for detecting the exhaust humidity of the drying drum, a relay 3 and an output terminal connected to the relay 3 Controller 2, described controller 2 is connected with power supply 4, and all far-infrared heaters 1 are connected with power supply 4 through a described relay 3, and wherein a first temperature sensor 5 is installed inside a described far-infrared heater 1, The first temperature sensor 5 and the humidity sensor 6 are connected to the input terminal of the controller 2, and the controller 2 controls the opening and closing of the relay 3 according to the received temperature signal or humidity signal.

During work, the first temperature sensor 5 detects the temperature in the far-infrared heater in the far-infrared heater 1 and transmits it to the controller 2 in the form of a signal, and the humidity sensor 6 detects the humidity of the discharged gas from the drying drum and sends it as a signal. The form is passed to controller 2.

The controller 2 compares the received temperature in the far-infrared heater with the preset upper limit temperature Tmax1 and the preset lower limit temperature Tmin1, and when the temperature in the far-infrared heater is greater than the preset upper limit temperature Tmax1, the control relay 3 is disconnected ; When the temperature in the far-infrared heater was less than the preset lower limit temperature Tmin1, the control relay 3 was closed; at the same time, the controller 2 compared the received humidity value with the preset humidity value, and when the humidity value was less than the preset humidity value, The control relay 3 is disconnected, and the drying process is terminated.

Because the far-infrared heater 1 itself has temperature limiting characteristics (different temperatures according to different TCM film systems, generally 200-400 degrees) and high consistency, this control system no longer uses a mechanical thermostat, but only a far-infrared heater 1 is installed with a first temperature sensor 5 for detecting and controlling temperature. Specifically, the first temperature sensor 5 is installed inside the far-infrared heater 1 . The electric current of the far-infrared heater 1 has the characteristic of gradually increasing, and instead of using multiple relays 3 to control them separately, only one relay 3 is used to control all the far-infrared heaters 1 . In this way, the system only uses one first temperature sensor 5 and one relay 3 to control all the far-infrared heaters 1, which simplifies the circuit and saves the cost.

In this embodiment, the far-infrared heater 1 can be installed on the drying drum or between the drying drum and the cabinet. When the far-infrared heater 1 is installed on the drying cylinder, the drying cylinder is provided with an installation hole, and the far-infrared heater 1 is installed in the installation hole to carry out the inside of the drying cylinder. heating.

In this embodiment, as another preference, when the far-infrared heater 1 is installed between the drying drum and the cabinet, the drying drum is provided with at least one set of hole arrays, and each set The hole arrays are composed of a plurality of holes, the far infrared heater 1 is arranged outside the hole arrays, and the inside of the drying drum can be heated through the hole arrays.

Since the far-infrared heater used in the clothes drying system in the prior art has a normal operating temperature of 600°C and can reach 1000°C under abnormal conditions, its temperature control is particularly important. In addition to the temperature detection and protection of the infrared heater, there is also a temperature sensor inside the drying drum. This temperature sensor is used to detect the temperature inside the drying drum to prevent the clothes from being damaged due to the high temperature inside the drying drum. This requires the whole The machine is equipped with a high-power fan to make the temperature in the barrel as uniform as possible. If the wind speed is slightly low and the air duct is slightly blocked, safety problems may occur.

In this control system, since the far-infrared heater 1 is used to heat the clothes, the temperature of the far-infrared heater 1 itself is locked. For example, the maximum temperature of the 200 film system does not exceed 200 ° C. If the temperature exceeds this temperature, the power will be automatically cut off. In addition, the heating of the clothes is not through the air medium, but directly heats the moisture of the clothes by the emitted far infrared radiation. These two aspects first ensure the safety of use, so the temperature sensor installed in the drying drum in the traditional clothes drying system is no longer so important, and the accuracy of temperature detection in the drying drum no longer depends on the wind speed. However, if the clothes to be dried are made of chemical fibers, wool, etc., which require relatively high temperatures, the temperature requirements in the drying drum are also relatively high.

Therefore, in this embodiment, as a preferred solution, the clothes dryer is further provided with at least one second temperature sensor 7, and the second temperature sensor 7 is connected to the input end of the controller 2 for detecting dryness. The temperature in the clothes drum is transmitted to the controller 2, and the controller 2 compares the received temperature in the drying drum with the preset upper limit temperature Tmax2 and the preset lower limit temperature Tmin2, when the temperature in the drying drum is greater than the preset When the upper limit temperature Tmax2, the control relay 3 is turned off; when the temperature in the drying drum is lower than the preset lower limit temperature Tmin2, the control relay 3 is turned on.

In this embodiment, as a preferred solution, the second temperature sensor 7 is arranged at the air outlet of the clothes dryer.

In this embodiment, the number of the second temperature sensor 7 is at least one. When the number of the second temperature sensors 7 is multiple, after all the second temperature sensors 7 transmit the detected temperatures in the drying cylinders to the controller 2, the controller 2 will receive the temperature in all the drying cylinders An average value is taken, and then the average value is used for comparison with the preset upper limit temperature Tmax2 and the preset lower limit temperature Tmin2.

In this embodiment, as a preferred solution, a fan 8 is provided at the air inlet of the clothes dryer, and the power of the fan 8 is 10 watts to 20 watts, and the fan 8 is connected to the controller 2. The controller 2 controls the rotation of the fan 8 . Since the control system avoids the dependence on the wind speed, the use of a high-power fan is avoided, and only a smaller fan is needed for auxiliary dehumidification, so the noise of this clothes dryer will be very low.

In this embodiment, since the control system adopts a low-power fan, the hot and humid gas will gather at the air outlet on the top of the dryer. Therefore, as a preferred solution, the humidity sensor 6 is placed at the air outlet of the dryer , in order to measure humidity more accurately.

In this embodiment, as a preferred solution, the controller 2 is made into a PCB integrated circuit board.

method embodiment

The present application also provides a method for controlling clothes dryers using far-infrared heating. Infrared heated clothes dryer. Fig. 2 is a flow chart of the clothes drying control method provided by the method embodiment of the present invention. As shown in Figure 2, the control method includes steps:

S11, after the drying process starts, the first temperature sensor 5 detects the temperature in the far-infrared heater in the far-infrared heater 1 and transmits it to the controller 2 in the form of a signal, and the humidity sensor 6 detects the temperature of the gas in the drying drum The humidity is transmitted to the controller 2 in the form of a signal.

S12. The controller 2 compares the received humidity value with the preset humidity value. When the humidity value is less than or equal to the preset humidity value, it indicates that the clothes in the drying drum have been dried, and step S13 is executed; When it is greater than the preset humidity value, step S14 is executed.

S13. The controller 2 judges whether the relay 3 is in the off state, if not, controls the relay 3 to be in the off state, and terminates the entire drying process.

S14, the controller 3 compares the received temperature in the far-infrared heater with the preset upper limit temperature Tmax1 and the preset lower limit temperature Tmin1, and when the temperature in the far-infrared heater is greater than the preset upper limit temperature Tmax1, step S13 is executed ; When the temperature in the far-infrared heater is less than the preset lower limit temperature Tmin1, execute step S15; when the temperature in the far-infrared heater is less than or equal to the preset upper limit temperature Tmax1 and greater than or equal to the preset lower limit temperature Tmin1, then the controller 2 does not respond.

S15. The controller 2 judges whether the relay 3 is in a closed state. If the relay 3 is not closed, the controller 2 controls the relay 3 to close, and the far-infrared heater 1 re-emits infrared rays.

In this embodiment, the value range of the preset upper limit temperature Tmax1 is preferably 190° C. to 210° C., but it is not limited thereto and can be determined according to specific conditions. The value range of the preset lower limit temperature Tmin1 is preferably 140° C. to 160° C., but it is not limited thereto, and can be determined according to specific conditions.

The present application also provides another control method of a clothes dryer using far-infrared heating. Far infrared heated clothes dryer. Fig. 3 is a flow chart of a preferred mode of the clothes drying control method provided by the method embodiment of the present invention. As shown in Figure 3, the control method includes steps:

S21, after the drying process starts, the first temperature sensor 5 detects the temperature in the far-infrared heater in the far-infrared heater 1 and transmits it to the controller 2 in the form of a signal, and the humidity sensor 5 detects the humidity of the gas in the drying drum And transmit it to the controller 2 in the form of a signal, and at the same time, the second temperature sensor 7 detects the temperature in the drying drum and transmits it to the controller 2 in the form of a signal.

S22. The controller 2 compares the received humidity value with the preset humidity value. When the humidity value is greater than the preset humidity value, step S24 is executed; when the humidity value is less than or equal to the preset humidity value, it indicates The laundry has been dried, go to step S23.

S23. The controller 2 judges whether the relay 3 is in the off state, if not, controls the relay 3 to be in the off state, and terminates the entire drying process.

S24. The controller 2 compares the received temperature in the far-infrared heater with the preset upper limit temperature Tmax1 and the preset lower limit temperature Tmin1, and compares the received temperature in the drying drum with the preset upper limit temperature Tmax2 and the preset temperature. Set the lower limit temperature Tmin2 for comparison, when the temperature in the far-infrared heater is greater than the preset upper limit temperature Tmax1, and the temperature in the drying drum is greater than the preset upper limit temperature Tmax2 and at least one of them is satisfied, it indicates that the temperature in the drying drum and/or Or the temperature in the far-infrared heater 1 is too high, in order to prevent the clothes and/or the far-infrared heater 1 from being burned, step S23 is performed; when the temperature in the far-infrared heater is lower than the preset lower limit temperature Tmin1, the When the temperature is lower than the preset lower limit temperature Tmin2 and meets at least one of them, it indicates that the temperature in the drying drum and/or the temperature in the far-infrared heater 1 is too low, and step S25 is executed; otherwise, the controller 2 does not respond.

S25. The controller 2 determines whether the relay 3 is in the closed state. If not, the relay 3 is controlled to be closed, and the far-infrared heater 1 re-emits infrared rays to continue heating the clothes in the drying drum.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (9)

1. a kind of dryer using Far-infrared Heating, including drying roller, which is characterized in that further include at least one far infrared What heater, the humidity sensor for detecting drying roller exhaust steam moisture, relay and output end were connected with the relay Controller, all far-infrared heaters are connected to power supply by the relay, inside one of them described far-infrared heater One the first temperature sensor, the input of first temperature sensor and the humidity sensor and the controller are installed End is connected, and temperature signal or moisture signal control the folding of the relay to the controller based on the received；

First temperature sensor detects the temperature in the far-infrared heater and passes to the control in the form of a signal Device processed, the humidity sensor detect the humidity of the drying roller gas be discharged and pass to the control in the form of a signal Device processed；

The controller by the far-infrared heater received temperature and preset upper limit temperature Tmax1 and pre-determined lower limit Temperature Tmin1 is compared, when the temperature in the far-infrared heater is greater than preset upper limit temperature Tmax1, described in control Relay disconnects；When the temperature in the far-infrared heater is less than pre-determined lower limit temperature Tmin1, controls the relay and close It closes；The humidity value received is compared by the controller with default humidity value, when humidity value is less than default humidity value, control It makes the relay to disconnect, and terminates drying course.

2. using the dryer of Far-infrared Heating as described in claim 1, which is characterized in that further include described dry for detecting At least one second temperature sensor of temperature in clothing roller, the input terminal phase of the second temperature sensor and the controller Even.

3. using the dryer of Far-infrared Heating as claimed in claim 2, which is characterized in that the second temperature sensor is set It sets at the dryer air outlet.

4. using the dryer of Far-infrared Heating as described in claim 1, which is characterized in that the humidity sensor is set to At the air outlet of the dryer.

5. using the dryer of Far-infrared Heating as described in claim 1, which is characterized in that the air inlet of the dryer It is provided with blower, the power of the blower is 10 watts to 20 watts；The blower is connected with the controller.

6. using the dryer of Far-infrared Heating as described in claim 1, which is characterized in that be provided on the drying roller Mounting hole, the far-infrared heater are mounted in the mounting hole to heat to drying drums inside.

7. using the dryer of Far-infrared Heating as described in claim 1, which is characterized in that the drying roller is equipped with extremely Few one group of hole array, hole array described in every group are made of multiple holes, and the hole array is arranged in the far-infrared heater Outside can be internally heated the drying roller by the hole array.

8. a kind of laundry drier control method using Far-infrared Heating is applied to described in claim 1 using Far-infrared Heating Dryer, which is characterized in that comprising steps of

S11, the temperature in the first temperature sensor detection far-infrared heater simultaneously pass to controller in the form of a signal, simultaneously Humidity sensor detects the humidity of gas in drying roller and passes to controller in the form of a signal；

The humidity value received is compared by S12, controller with default humidity value, when humidity value is greater than default humidity value, Execute step S14；When humidity value is less than or equal to default humidity value, step S13 is executed；

S13, controller control relay are in an off state；

S14, controller are by the temperature and preset upper limit temperature Tmax1 and pre-determined lower limit temperature in the far-infrared heater received Tmin1 is compared, and when the temperature in far-infrared heater is greater than preset upper limit temperature Tmax1, executes step S13；When remote When temperature in infrared heater is less than pre-determined lower limit temperature Tmin1, step S15 is executed；

S15, controller control relay are in closed state.

9. a kind of laundry drier control method using Far-infrared Heating is applied to as claimed in claim 2 using Far-infrared Heating Dryer, which is characterized in that comprising steps of

S21, the temperature in the first temperature sensor detection far-infrared heater simultaneously pass to controller, humidity in the form of a signal Sensor detects the humidity of gas in drying roller and passes to controller in the form of a signal, while second temperature sensor is examined Survey drying roller in temperature and pass to controller in the form of a signal；

The humidity value received is compared by S22, controller with default humidity value, when humidity value is greater than default humidity value, Execute step S24；When humidity value is less than or equal to default humidity value, step S23 is executed；

S23, controller control relay are in an off state；

S24, controller are by the temperature and preset upper limit temperature Tmax1 and pre-determined lower limit temperature in the far-infrared heater received Tmin1 is compared, and by the drying roller received temperature and preset upper limit temperature Tmax2 and pre-determined lower limit temperature Tmin2 is compared, and when the temperature in far-infrared heater is greater than preset upper limit temperature Tmax1, the temperature in drying roller is big When preset upper limit temperature Tmax2 at least meets one of them, step S23 is executed；When the temperature in far-infrared heater is less than When pre-determined lower limit temperature Tmin1, the temperature in drying roller are less than pre-determined lower limit temperature Tmin2 and one of at least meet, hold Row step S25；

S25, controller control relay are in closed state.