Heating device and dryer equipped with heating device

Abstract

The heating device comprises: a water tank (2) serving as a heating chamber for accommodating a heating object; a microwave irradiation unit (31) irradiating electromagnetic waves into the heating chamber; a first electromagnetic wave shielding body for suppressing electromagnetic waves leaking from the heating chamber; and a microwave receiving unit (36) for receiving electromagnetic waves. The heating device also comprises a spark detection unit for detecting electromagnetic waves generated by sparks among the electromagnetic waves received by the microwave receiving unit (36), the sparks being generated in the heating chamber due to the irradiation of the electromagnetic waves. The spark detection unit detects electromagnetic waves amplified in the space of the first electromagnetic wave shielding body.

Description

Technical Field

[0001] The present disclosure relates to a heating device for heating a heating object using microwaves and a dryer including the heating device. Background Art

[0002] As an example of a heating device, there is a clothes dryer that heats clothes to dry them. As a method of achieving high-speed drying performance of clothes dryers and washing and drying machines, there is a method of using microwaves as a heat source for heating the moisture in clothes (for example, refer to Patent Document 1). According to this method, the moisture in the clothes can be directly heated by irradiating microwaves to the clothes, thereby quickly evaporating the moisture in the clothes. Therefore, compared with the conventional warm air drying using a heater or a heat pump, the clothes can be dried in a short time.

[0003] Fig.11 This is a block diagram of a conventional clothes dryer described in Patent Document 1. The clothes dryer includes: a microwave irradiation unit 101 that irradiates microwaves to clothes; a clothes storage 102 that stores clothes; a blower 103 that introduces external air into the clothes storage 102 and sends out the air in the clothes storage 102; a heater 104 that dries clothes; a microwave control unit 105 that controls the microwave irradiation unit 101; a microwave reflection detection unit 106 that senses the state of microwave reflection; and a control circuit 107 that controls the microwave control unit 105.

[0004] The clothes dryer of this structure uses microwaves to directly heat the moisture attached to the fibers of the clothes, thereby shortening the drying time of the clothes, especially when the moisture content of the clothes is about 30% or less.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2008-000249 Summary of the invention

[0008] However, in conventional clothes dryers, when clothes stored in clothes storage 102 have metal such as buttons and zippers, the electric field strength of microwaves in clothes storage 102 may be increased to generate sparks. In order to cope with such a situation, a technology capable of detecting the generation of sparks is indispensable.

[0009] The present disclosure provides a technology for detecting the generation of sparks in a heating device that heats a heating object by irradiating electromagnetic waves.

[0010] The heating device disclosed in the present invention comprises: a heating chamber that accommodates a heating object; an irradiation unit that irradiates electromagnetic waves into the heating chamber; and a first electromagnetic wave shielding body that is used to suppress electromagnetic waves leaking from the heating chamber. In addition, it comprises: a receiving unit that receives electromagnetic waves; and a detection unit that detects electromagnetic waves generated by sparks in the electromagnetic waves received by the receiving unit, the sparks being generated in the heating chamber due to the irradiation of the electromagnetic waves. In addition, the detection unit detects electromagnetic waves amplified in the space of the first electromagnetic wave shielding body.

[0011] According to the present disclosure, the detection unit of the heating device can more accurately detect the generation of sparks in the heating chamber by detecting the electromagnetic waves amplified in the space of the first electromagnetic wave shielding body. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a longitudinal sectional view schematically showing the structure of the drum-type washing and drying machine for explaining the heating device according to the first embodiment.

[0013] Figure 2 It is a structural diagram of the heating device involved in the first embodiment.

[0014] Figure 3 It is a structural diagram of the heating device involved in the first embodiment.

[0015] Figure 4 It is a diagram for explaining the frequency and intensity of electromagnetic waves received by the microwave receiving section of the heating device according to the first embodiment.

[0016] Figure 5 This is a schematic diagram for explaining the conditions for causing resonance of electromagnetic waves in the heating device according to the first embodiment.

[0017] Figure 6 It is an explanatory diagram showing the relationship between the frequency and attenuation of electromagnetic waves with respect to water in the heating device according to the first embodiment.

[0018] Figure 7 It is a structural diagram of a heating device according to a second embodiment.

[0019] Figure 8 It is an explanatory diagram showing the relationship between the intensities of electromagnetic waves inside and outside the electromagnetic shield of the heating device according to the second embodiment.

[0020] Fig. 9 It is a structural diagram of a heating device according to a third embodiment.

[0021] Fig.10 This is another structural diagram of the heating device according to the third embodiment.

[0022] Fig.11 This is a block diagram of a conventional clothes dryer. DETAILED DESCRIPTION

[0023] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. However, unnecessary detailed descriptions are sometimes omitted. For example, detailed descriptions of well-known matters or repeated descriptions of substantially the same structures are sometimes omitted. This is to avoid the following description from becoming unnecessarily lengthy and to make it easy for those skilled in the art to understand.

[0024] Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to be used to limit the subject matter recited in the claims.

[0025] (First Embodiment)

[0026] In the first embodiment, a washing and drying machine for heating and drying laundry such as clothes is used as the heating device. Alternatively, the heating device may be a clothes dryer or a device for heating an object other than laundry.

[0027] Figure 1 1 is a longitudinal cross-sectional view schematically showing the structure of a drum-type washing and drying machine 60 for explaining the heating device involved in the first embodiment. The left side is the front, the right side is the rear, the upper side is the upper side, and the lower side is the lower side. The drum-type washing and drying machine 60 of this embodiment has the function of washing and drying laundry such as clothes, and also functions as a washing machine that only performs a washing function, also functions as a drying machine that only performs a drying function, and also functions as a washing and drying machine that performs a washing function and a drying function.

[0028] The drum-type washing and drying machine 60 has a function of irradiating microwaves, which are a type of electromagnetic waves, to the laundry in the drum to heat it. First, the basic structure and operation of the drum-type washing and drying machine 60 are described, and then the details of the first electromagnetic wave shielding body used in the drum-type washing and drying machine 60 to suppress the leakage of microwaves from the housing when irradiating microwaves are described.

[0029] The drum-type washing and drying machine 60 has a water tank 2 as a heating chamber, and the water tank 2 is formed in a bottomed cylindrical shape for storing washing water. The water tank 2 is supported in a freely swinging manner in the housing 1 (main body) by a shock absorber 4 arranged below it. A drum 3 for accommodating laundry such as clothes as drying objects is rotatably arranged in the water tank 2. The drum 3 is also formed in a bottomed cylindrical shape. The drum 3 is arranged in a horizontal manner with a rotating axis. In other examples, the drum 3 may also be arranged in a manner in which the rotating axis is inclined forward and upward relative to the horizontal, and may also be arranged in a manner in which the rotating axis is vertical. In the present embodiment, the heating chamber is described as the water tank 2 including the drum 3, but the drum 3 alone may also be used as the heating chamber.

[0030] A drive motor 6 is installed on the back of the water tank 2. The drive motor 6 rotates the drum 3 in the positive direction and the reverse direction around the rotation axis. The drum type washing and drying machine 60 utilizes the rotation of the drum 3 driven by the drive motor 6 to stir, beat, rinse and dry the laundry contained in the drum 3.

[0031] An opening 19 and a door 5 for opening and closing the opening 19 are provided on the front surface of the housing 1 at a position facing the opening ends of the drum 3 and the water tank 2. The user can put laundry into the drum 3 or take it out of the drum 3 by opening the door 5.

[0032] The water tank 2 includes: a water tank front portion 2a having a water tank opening 2c disposed at a position facing the opening 19 of the housing 1; and a water tank rear portion 2b disposed at a position further back than the water tank front portion 2a. An elastic cylindrical water seal 23 is disposed in a manner that connects the edge of the water tank opening 2c of the water tank front portion 2a to the edge of the opening 19 over the entire circumference. When the user closes the door body 5, the water seal 23 is pressed by the door body 5 and elastically deformed, thereby ensuring the water tightness of the water tank 2 relative to the outside of the machine.

[0033] The front part 2a of the water tank may also be the top surface part of the water tank 2 formed in the shape of a bottomed cylinder. In this case, the rear part 2b of the water tank may also be the side part and the bottom part of the cylinder. The front part 2a of the water tank may also include a part of the front of the side part in addition to the top surface part of the cylinder. In this case, the rear part 2b of the water tank may also be the remaining part and the bottom part behind the side part of the cylinder. The rear part 2b of the water tank may also include a part of the side side of the top surface part in addition to the side part and the bottom part of the water tank 2. In this case, the front part 2a of the water tank may also be the remaining part of the water tank opening 2c side of the top surface part of the cylinder. The front part 2a of the water tank and the rear part 2b of the water tank may be manufactured as one piece, or may be manufactured as independent parts, and the water tank 2 may be formed by connecting the front part 2a of the water tank and the rear part 2b of the water tank. When the water tank front portion 2a and the water tank rear portion 2b are manufactured as independent parts, a water seal seal 23 is also provided at the connection portion between the water tank front portion 2a and the water tank rear portion 2b.

[0034] A water supply pipe 13 is connected to the upper part of the water tank 2. A water supply valve 12 is provided in the middle of the water supply pipe 13. The water supply valve 12 is used to supply water into the water tank 2 via the water supply pipe 13. In addition, a drain pipe 11 is connected to the lowermost part of the water tank 2. A drain valve 10 is provided in the middle of the drain pipe 11. The drain valve 10 is used to discharge the water in the water tank 2 to the outside of the housing 1, that is, outside the machine, via the drain pipe 11.

[0035] A shock absorber 4 is provided below the water tank 2. The shock absorber 4 supports the water tank 2 and attenuates the vibration of the water tank 2 caused by the displacement of the laundry in the drum 3 during dehydration. A cloth amount detector (not shown) is mounted on the shock absorber 4. The cloth amount detector detects the displacement of the shaft of the shock absorber 4 up and down due to the weight change of the laundry in the drum 3. The drum-type washing and drying machine 60 detects the amount of laundry in the drum 3 based on the displacement detected by the cloth amount detector.

[0036] The drum 3 has: a drum front portion 3a having a drum opening portion 3c disposed at a position facing the opening portion 19 of the housing 1; and a drum rear portion 3b disposed at a position further back than the drum front portion 3a. The drum front portion 3a may also be a top surface portion of the drum 3 formed in a bottomed cylindrical shape. In this case, the drum rear portion 3b may also be a side surface portion and a bottom surface portion of the cylinder. The drum front portion 3a may also include a portion of the front of the side surface portion in addition to the top surface portion of the cylinder. In this case, the drum rear portion 3b may also be the remaining portion and the bottom surface portion of the rear of the side surface portion of the cylinder. The drum rear portion 3b may also include a portion of the side side of the top surface portion in addition to the side surface portion and the bottom surface portion of the drum 3. In this case, the drum front portion 3a may also be the remaining portion of the drum opening 3c side of the top surface portion of the cylinder. The drum front portion 3a and the drum rear portion 3b may be manufactured integrally, or may be manufactured as separate parts, and the drum 3 is formed by connecting the drum front portion 3a and the drum rear portion 3b.

[0037] The drum-type washing and drying machine 60 includes a circulating air duct 7 for circulating air in the water tub 2 and the drum 3, and a microwave heating device 30 for irradiating microwaves to the drying object in the drum 3. The microwave heating device 30, which constitutes a heating unit for heating the drying object, irradiates microwaves into the drum 3 from a microwave irradiation port 32 provided between the water tub opening 2c of the water tub 2 as a heating chamber and the opening 19 of the housing 1, thereby heating the moisture contained in the drying object in the drum 3.

[0038] The circulating air duct 7 is configured as an air circulating air duct for drying the drying object in the drying process. The air circulating air duct includes the water tank 2 and the drum 3. The circulating air duct 7 is provided in a manner that connects the blowing port 8 (drying air blowing port) provided on the bottom surface of the water tank 2 with the exhaust port 9 (drying air exhaust port) provided on the side front of the water tank 2.

[0039] A lint filter 22, a dehumidifier 21, a heater 17, and a blower fan 16 are provided in the circulating air passage 7 from the exhaust port 9 side. The lint filter 22 is a filter having a nylon mesh, and is used to capture lint contained in the air flowing in the circulating air passage 7. The dehumidifier 21 dehumidifies the air flowing in the circulating air passage 7. The dehumidifier 21 may be either a water-cooled type or an air-cooled type. The heater 17 heats the air flowing in the circulating air passage 7. The dehumidifier 21 and the heater 17 may also be composed of an evaporation section and a condensation section of a heat pump device. The blower fan 16 circulates the air in the water tank 2 and the drum 3 in the circulating air passage 7.

[0040] The heater 17 and the microwave irradiation unit (details will be described later) constitute a heating unit for heating the drying object, and both are energized at the same time, or either one is energized. In addition, as a method of heating the drying object using the heating unit, there are methods of directly heating using microwaves, and methods of indirectly heating using a heater or the like to heat the circulating air or the inner wall of the drum 3, etc., which are not particularly limited. In the case where the clothes or the like as the drying object have metals such as buttons and zippers and are likely to generate sparks, the output of the microwave irradiated from the microwave irradiation unit into the drum 3 is reduced or stopped to switch to drying using the heater 17.

[0041] An inflow temperature detector 18 is provided in the circulation air passage 7. The inflow temperature detector 18 detects the temperature of the air flowing into the drum 3. The inflow temperature detector 18 is composed of, for example, a thermistor or the like.

[0042] A control device 20 is provided in the housing 1. The control device 20 controls the blower fan 16, the heater 17, the microwave irradiation unit, etc. The control device 20 also controls the drive motor 6, the water supply valve 12, the drain valve 10, etc. to sequentially perform the washing, rinsing, and drying processes.

[0043] The control device 20 is implemented in hardware by a CPU, memory, other LSI, etc. of any computer, and in software by a program loaded in the memory, etc. It should be understood by those skilled in the art that the control device 20 can be implemented in various forms such as only by hardware or by a combination of hardware and software.

[0044] Next, the flow of drying air is described. When microwaves are irradiated into the drum 3, the moisture contained in the drying object is heated and evaporated. When the blower fan 16 is driven, the air that has become moist due to the evaporated moisture flows into the circulation air path 7 through the outlet 9 provided in the water tank 2. The air flowing into the circulation air path 7 is sent to the dehumidifier 21 and the heater 17 by the blower fan 16. The air passing through the dehumidifier 21 is cooled and dehumidified. The cooled air is heated by the heater 17.

[0045] The air that has passed through the heater 17 is blown out again into the drum 3 through the blow-out port 8. In addition, in the clothes dryer without a washing function, there is no water tank 2 for accumulating washing water, a water supply valve 12, a water supply pipe 13, a drain valve 10, and a drain pipe 11. Moreover, the drum 3 functions as a heating chamber, and the connection between the rotating drum 3 and the circulating air path 7 is configured so that the drum 3 slides on a sealing member such as felt.

[0046] In the drum-type washing and drying machine 60 of the present embodiment, since microwaves are irradiated inside the drum 3, it is necessary to configure the drum-type washing and drying machine 60 so that the intensity of electromagnetic waves leaking to the outside of the drum-type washing and drying machine 60 is less than a reference value specified in the region where the drum-type washing and drying machine 60 is used. Therefore, the drum-type washing and drying machine 60 of the present embodiment includes a first electromagnetic wave shielding body for suppressing the leakage of microwaves irradiated from the microwave irradiation port 32.

[0047] As a standard related to leakage electromagnetic waves, there is, for example, the Japanese Industrial Standard "JIS C9250" for microwave ovens with a rated high-frequency output of 2 kW or less that use electromagnetic waves (microwaves) in the 2.45 GHz frequency band to heat food, and microwave ovens having additional devices therein. Section 5.8 of the standard stipulates that "the power density of the leakage electromagnetic waves measured by the power density test of the leakage electromagnetic waves specified in Section 8.2.12 of the standard shall satisfy the following: (1) When the door is closed, the power density of the leakage electromagnetic waves shall be 1 mW / cm 2 (2) When the door is opened and fixed to the maximum position before the oscillation stop device of the oscillating tube is about to start the action, the power density of the leakage wave is 5mW / cm 2 (3) In the state where the oscillation stopping device other than the main oscillation stopping device is constrained, the power density of the leakage radio wave is 5mW / cm 2 In addition, the same content is also stipulated in Item 2(95) of Appendix 8 of the Notice on the Interpretation of "Ministerial Ordinance Prescribing Technical Standards for Electrical Appliances and Materials" which is used to stipulate technical standards stipulated in the Ministry of Economy, Trade and Industry Ordinance stipulated in Article 8, Paragraph 1 of the Electrical Appliance and Material Safety Act. It is also believed that the same standards as those for microwave ovens are appropriate for washing and drying machines.

[0048] In addition, WHO (World Health Organization) recommends the use of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines, which are formulated by experts from various countries based on scientific evidence, as exposure limits for human protection. In this guideline, the exposure limit is set at 0.08W / kg (1mW / cm 2 ). The international standard "IEC62233" established by the International Electrotechnical Commission (IEC) and the Japanese Industrial Standard "JIS 1912" established based on the international standard stipulate the method for measuring the electromagnetic field related to human exposure from household electrical appliances and similar equipment. In the measurement method specified in the standard, the electromagnetic field is measured in the form of a ratio to the exposure limit value by weighting the signal of the sensor that detects the electromagnetic field. If the exposure limit value specified in the ICNIRP guideline is not exceeded, it is determined to comply with the ICNIRP guideline. The first electromagnetic wave shield is constructed to comply with these standards.

[0049] In a microwave oven, large vibrations do not occur during microwave irradiation, but in the drum-type washing and drying machine 60 of this embodiment, when the drum 3 is rotated during the drying process in order to improve the drying efficiency, the drum 3 and the water tank 2 vibrate. Therefore, the first electromagnetic wave shielding body of the drum-type washing and drying machine 60 of this embodiment has a structure that can suppress microwaves leaking from the gap even when microwaves are irradiated when the drum 3 and the water tank 2 vibrate. Details will be described later.

[0050] Figure 2 1 is a structural diagram for explaining a microwave heating device 30, a water tank 2, a drum 3, a door 5, and a control device 20, etc., of a heating device according to a first embodiment. Figure 1 The positional relationship when viewed from the front surface position of the drum-type washing and drying machine 60 to the rear is shown in FIG. As for the position where the microwave irradiation port 32 is set, it can also be set to the position where the microwave irradiation port 32 is set as long as the microwave can be irradiated to the water tank 2 as the heating chamber. Figure 2 In addition, the microwave heating device 30 and the control device 20 can be set at positions other than the first electromagnetic wave shielding body. Figure 2 different.

[0051] The microwave heating device 30 includes a microwave irradiation section 31, a waveguide 34, a microwave irradiation port 32, a microwave control device 40, a reflection section 33, and a microwave receiving section 36. The microwave irradiation section 31 irradiates microwaves. The waveguide 34 guides the irradiated microwaves into the drum 3. The microwave irradiation port 32 is provided at the front end of the waveguide 34 and in the water tank 2. The microwave control device 40 adjusts the output of the microwave irradiated from the microwave irradiation section 31. The reflection section 33 is provided between the microwave irradiation section 31 and the microwave irradiation port 32, and reflects part or all of the microwave reflected from the drum 3 and irradiates it into the drum 3. The microwave receiving section 36 is provided on the inner side of the first electromagnetic wave shielding body, and receives electromagnetic waves including the microwave irradiated from the microwave irradiation section 31 and the electromagnetic waves generated by the sparks.

[0052] The first electromagnetic wave shielding body is formed of a material including an electromagnetic wave blocking material such as metal that can reflect or absorb microwaves. The first electromagnetic wave shielding body includes at least a wall forming a heating chamber and a door body for allowing the heated object to enter and exit the heating chamber. Here, in the case where the heating chamber is a bottomed cylindrical shape, the wall forming the heating chamber includes a cylindrical side wall and a bottom surface. Figure 2 In the embodiment, the first electromagnetic wave shielding body is composed of the water tank 2 and the door body 5 as the heating chamber.

[0053] Alternatively, part or all of the drum 3 or the housing 1 may be made of a material containing an electromagnetic wave blocking material to form a first electromagnetic wave shielding body.

[0054] In addition, the first electromagnetic wave shielding body may also include a first choke portion 38 in order to block or attenuate the electromagnetic waves leaking from the gap between the water tank 2 and the door body 5 to suppress them. The first choke portion 38 is formed at the junction of the water tank 2 and the door body 5, and has a high shielding effect for the frequency band of the microwaves irradiated from the microwave irradiation portion 31. The first choke portion 38 can adopt any choke structure known in the technical field of microwave ovens, etc.

[0055] In addition, the first electromagnetic wave shield may be formed of a conductive material such as metal that can reflect microwaves irradiated from the microwave irradiation unit 31, or a dielectric or magnetic material that can absorb and attenuate microwaves by dielectric loss or magnetic loss, etc., instead of the choke structure.

[0056] The microwave irradiation unit 31 is a microwave oscillator such as a magnetron, which oscillates electromagnetic waves of a frequency of the 2.45 GHz band that can be used by the microwave heating device. In addition, it is not limited to the 2.45 GHz band allocated as an ISM (Industry Science Medical) band, and can also be electromagnetic waves of a frequency of the 915 MHz band allocated in the same manner. Microwaves adjusted to an arbitrary output by the microwave control device 40 are irradiated from the microwave irradiation unit 31. The irradiated microwaves are irradiated into the rotating drum 3 through the waveguide 34 and the microwave irradiation port 32 to heat the moisture contained in the drying object such as clothes.

[0057] Of the microwaves irradiated into the drum 3, a portion of the microwaves not absorbed by the moisture contained in the drying object returns as reflected waves from the drum 3 through the microwave irradiation port 32 to the microwave irradiation unit 31. The microwaves returned to the microwave irradiation unit 31 are converted into heat and processed as exhaust heat.

[0058] The reflecting part 33 reflects part or all of the reflected waves reflected from the drum 3 and traveling in the direction of returning to the microwave irradiating part 31, and makes them enter the drum 3 again together with the microwave irradiated from the microwave irradiating part 31. Thus, energy loss can be reduced and drying time can be shortened.

[0059] Figure 3 The configurations of a microwave control device 40, a microwave receiving unit 36, and a microwave irradiation unit 31 are shown for explaining the heating device according to the first embodiment. The microwave control device 40 is realized by hardware such as a microcomputer, a microcontroller, and an integrated circuit.

[0060] The microwave control device 40 includes a spark detection unit 41 and an output adjustment unit 42. These structures are implemented in hardware by a CPU, memory, other LSI, etc. of any computer, and in software by a program loaded in the memory, etc., but the functional blocks implemented by their cooperation are described here. Therefore, it should be understood by those skilled in the art that these functional blocks can be implemented in various forms such as only by hardware or by a combination of hardware and software.

[0061] The microwave control device 40 controls the microwave irradiation unit 31 according to the instruction from the control device 20 in the washing process, rinsing process or drying process controlled by the control device 20. The microwave control device 40 heats the washing water in the washing process, heats the rinsing water in the rinsing process, heats the water contained in the drying object in the drying process, or heats and sterilizes the bacteria attached to the washing or drying object. To this end, the microwave irradiation unit 31 irradiates microwaves into the drum 3. In addition, when heating the washing water or the rinsing water, the microwaves can also be irradiated into the water tank 2 where the washing water or the rinsing water is accumulated.

[0062] The spark detection unit 41 can detect the occurrence of sparks in the heating chamber by detecting electromagnetic waves generated by sparks among the electromagnetic waves received by the microwave receiving unit 36. For example, the spark detection unit 41 detects changes in the intensity of the received electromagnetic waves to detect the occurrence of sparks. In addition, in order to improve the detection accuracy of sparks, changes in the intensity of electromagnetic waves at a specified frequency can also be detected to detect the occurrence of sparks. Here, the electromagnetic waves detected by the spark detection unit 41 as electromagnetic waves generated by sparks from the electromagnetic waves received by the microwave receiving unit 36 ​​are referred to as spark electromagnetic waves.

[0063] First, the frequency of electromagnetic waves generated by sparks will be described.

[0064] Figure 4 This is a diagram illustrating the frequency and intensity of electromagnetic waves received by the microwave receiving unit in the heating device according to the first embodiment, and illustrates the relationship between the frequency and intensity of electromagnetic waves received by the microwave receiving unit 36 ​​when a metal sheet is accommodated in the heating chamber and microwaves are irradiated from the microwave irradiation unit 31 into the heating chamber to generate sparks, assuming that the clothing has metal such as buttons and zippers. The horizontal axis represents the frequency of the electromagnetic wave, and the vertical axis represents the intensity of the electromagnetic wave.

[0065] The electromagnetic waves received by the microwave receiving unit 36 ​​include both microwaves irradiated from the microwave irradiation unit 31 and electromagnetic waves generated by sparks. The sparks are generated by the irradiated microwaves. Here, the frequency of the microwaves irradiated from the microwave irradiation unit 31 is in the 2.45 GHz band.

[0066] Here, the microwave receiving unit 36 ​​is provided with a filter having a frequency characteristic of blocking or attenuating the microwaves irradiated from the microwave irradiation unit 31. The filter is, for example, a low-pass filter constituted by hardware. Thus, the electromagnetic wave intensity of the frequency band of the microwaves irradiated from the microwave irradiation unit 31 among the electromagnetic waves received by the microwave receiving unit 36 ​​is reduced.

[0067] Therefore, the peak of the intensity of the electromagnetic wave is not detected compared with other frequencies in the frequency band of the microwave irradiated from the microwave irradiation unit 31. In addition, the peak of the intensity of the electromagnetic wave generated by the spark is detected in the frequency band above 100 MHz, especially around 100 MHz to 1.5 GHz.

[0068] As described above, the frequency of the electromagnetic wave generated by the spark is 100 MHz or more, and the generation of the spark can be detected by receiving the electromagnetic wave having a frequency different from the frequency of the microwave irradiated from the microwave irradiation unit 31 and detecting the change in the intensity of the electromagnetic wave.

[0069] The electromagnetic waves generated by the sparks are not electromagnetic waves having only a specific frequency, but electromagnetic waves having a wide range of frequencies above the 100 MHz band.

[0070] Therefore, the spark detection unit 41 analyzes the frequency of the electromagnetic wave received by the microwave receiving unit 36 ​​and detects the change in the intensity of the electromagnetic wave having a frequency different from the frequency of the microwave irradiated from the microwave irradiation unit 31 as a spark electromagnetic wave, thereby detecting the generation of the spark.

[0071] Alternatively, the microwave receiving unit 36 ​​may use a filter (a low-pass filter, a band-stop filter, or a high-pass filter) having a frequency characteristic of blocking or attenuating the microwaves irradiated from the microwave irradiation unit 31 to receive only the electromagnetic waves generated from the spark, so that the spark detection unit 41 detects the spark electromagnetic waves. Alternatively, the frequency analysis and the filter may be used together. In addition, the filter provided in the microwave receiving unit 36 ​​may also be provided in the spark detection unit 41.

[0072] Next, the intensity of the electromagnetic wave generated by the spark will be described.

[0073] The intensity of the electromagnetic waves generated by the sparks is much weaker than the intensity of the electromagnetic waves of the microwaves irradiated into the heating chamber from the microwave irradiation unit 31, so the irradiated microwaves become noise. Therefore, it may be difficult to detect the electromagnetic waves generated by the sparks.

[0074] Here, the resonance phenomenon of electromagnetic waves is explained. As mentioned above, the electromagnetic waves generated by sparks are not electromagnetic waves with only a specific frequency, but electromagnetic waves with a wide range of frequencies above the 100MHz band. Therefore, in the electromagnetic waves above a certain specified frequency in the electromagnetic waves, resonance may occur in the space of the electromagnetic wave shield.

[0075] Figure 5 This is a schematic diagram for explaining the conditions for the occurrence of electromagnetic wave resonance in the heating device according to the first embodiment. Generally speaking, in the space of an electromagnetic wave shield, resonance occurs when the distance between the facing surfaces of the electromagnetic wave shield satisfies the relationship that the distance is an integer multiple of 1 / 2 of the wavelength λ of the electromagnetic wave. Figure 5 The resonance phenomenon is shown when the distance between the facing surfaces of the electromagnetic shield is 1 time, 2 times, and 3 times 1 / 2 of the wavelength λ of the electromagnetic wave.

[0076] For example, the maximum straight line length among the x-axis length, y-axis length, and z-axis length in the space constituting the electromagnetic shield is set to Lmax. Resonance occurs in the short electromagnetic waves whose half wavelength, i.e., λ / 2, is less than Lmax among the electromagnetic waves generated by the spark. The intensity of the electromagnetic waves generated by the spark is amplified by the resonance phenomenon.

[0077] Therefore, the spark detection unit 41 can also detect the generation of the spark with high accuracy by selectively detecting the electromagnetic wave of the spark, among the electromagnetic waves generated by the spark, which has a frequency that resonates according to the size of the space of the first electromagnetic shielding body, and detecting the spark electromagnetic wave.

[0078] That is, as described above, when the maximum straight line length among the x-axis length, the y-axis length, and the z-axis length in the space constituting the first electromagnetic wave shielding body is Lmax, the spark detection unit 41 detects the electromagnetic wave of (λ / 2)≤Lmax as the spark electromagnetic wave. Thus, the spark detection unit 41 can more accurately detect the generation of sparks in the heating chamber by detecting the electromagnetic wave generated by the spark amplified in the space of the first electromagnetic wave shielding body as the spark electromagnetic wave.

[0079] For example, the case where the first electromagnetic wave shield is substantially formed in the shape of a right circular cylinder is described. In the right circular cylinder, the larger value of the maximum diameter of the circle as the cross section and the maximum depth length of the cylinder is set to Lmax. In the electromagnetic waves generated by the spark, the resonance phenomenon occurs in the electromagnetic waves whose half wavelength, i.e., λ / 2, is less than Lmax. The intensity of the electromagnetic waves generated by the spark is amplified by the resonance phenomenon.

[0080] In addition, the case where the first electromagnetic wave shield is substantially formed in a rectangular parallelepiped shape is described. The maximum straight line length of the three sides forming the rectangular parallelepiped shape is set to Lmax. Among the electromagnetic waves generated by the spark, a resonance phenomenon occurs in a short electromagnetic wave whose half wavelength, i.e., λ / 2, is less than Lmax. The intensity of the electromagnetic wave generated by the spark is amplified by the resonance phenomenon.

[0081] As described above, the spark detection unit 41 can also detect the generation of sparks with high accuracy by selectively detecting electromagnetic waves of a frequency resonating according to the size of the space of the first electromagnetic wave shield among electromagnetic waves generated by sparks and detecting spark electromagnetic waves.

[0082] Finally, the influence of moisture contained in the clothes as the heating object on the electromagnetic waves generated by the spark during the drying operation of the drum-type washing and drying machine 60 will be described.

[0083] Figure 6 This is an explanatory diagram showing the relationship between the frequency and attenuation of electromagnetic waves with respect to water in the heating device according to the first embodiment. The horizontal axis represents the frequency of the electromagnetic waves, and the vertical axis represents the loss of the electromagnetic waves.

[0084] From the frequency of 5 GHz or more, the degree of attenuation of water increases rapidly. The intensity of the electromagnetic wave generated by the spark is weak, so if the degree of attenuation caused by the moisture contained in the clothes increases, it becomes difficult to detect the spark. Therefore, the microwave receiving unit 36 ​​can also receive electromagnetic waves containing frequency components below 10 GHz, preferably below 5 GHz, thereby detecting the spark with higher accuracy. In addition, the spark detection unit 41 can also detect electromagnetic waves containing frequency components below 10 GHz, preferably below 5 GHz, thereby detecting the spark with higher accuracy.

[0085] That is, the spark detection unit 41 detects, for example, electromagnetic waves with a frequency of 10 GHz or less, preferably 5 GHz or less, among electromagnetic waves generated by sparks generated in the heating chamber formed by the water tank 2 or the drum 3. Thus, the spark detection unit 41 can detect the generation of sparks more accurately by detecting the spark electromagnetic waves.

[0086] Furthermore, when the spark electromagnetic wave is detected by the spark detection unit 41, that is, when a spark is generated, the output adjustment unit 42 adjusts the output of the microwave irradiated from the microwave irradiation unit 31. Specifically, when the spark electromagnetic wave is detected by the spark detection unit 41, the output adjustment unit 42 regards that the generation of the spark is detected and reduces the output of the microwave irradiated from the microwave irradiation unit 31. Alternatively, the output of the microwave irradiated from the microwave irradiation unit 31 is stopped.

[0087] Thus, the generation of sparks in the drum 3 can be accurately detected, and the output of microwaves irradiated from the microwave irradiation unit 31 can be reduced or stopped. That is, the drying object in the drum 3 is prevented from being damaged by sparks generated by metal or the like contained in the drying object.

[0088] As described above, according to the present embodiment, the drum-type washing and drying machine 60 as a heating device includes: a water tank 2 or a drum 3 as a heating chamber, which accommodates clothes as heating objects; a microwave irradiation unit 31, which irradiates electromagnetic waves into the heating chamber; and a first electromagnetic wave shielding body, which is used to suppress electromagnetic waves leaking from the heating chamber. In addition, it includes: a microwave receiving unit 36, which receives electromagnetic waves; and a spark detection unit 41, which detects electromagnetic waves generated by sparks among the electromagnetic waves received by the microwave receiving unit 36, and the sparks are generated in the heating chamber due to the irradiation of electromagnetic waves. In addition, the spark detection unit 41 is configured to detect electromagnetic waves amplified in the space of the first electromagnetic wave shielding body.

[0089] According to this configuration, the spark detection unit 41 can more accurately detect the generation of sparks in the heating chamber by detecting the spark electromagnetic wave in the space of the first electromagnetic wave shielding body.

[0090] Alternatively, the maximum straight line length among the x-axis length, y-axis length, and z-axis length of the space constituting the first electromagnetic shielding body may be set to Lmax, and the spark detection unit 41 may be configured to detect electromagnetic waves having a wavelength λ satisfying (λ / 2)≤Lmax. According to this configuration, the spark detection unit 41 can more accurately detect the generation of sparks in the heating chamber by detecting electromagnetic waves amplified in the space of the first electromagnetic shielding body.

[0091] In addition, the spark detection unit 41 may be configured to detect electromagnetic waves having a frequency of 10 GHz or less, preferably 5 GHz or less, among electromagnetic waves generated by sparks generated in the heating chamber. According to this configuration, the generation of sparks in the heating chamber can be detected more accurately.

[0092] Alternatively, the first electromagnetic shielding body may include at least a wall forming the heating chamber and a door body for allowing the heated object to enter and exit the heating chamber. According to this structure, the first electromagnetic shielding body can be optimally constructed, and the spark electromagnetic wave in the space of the first electromagnetic shielding body can be detected by the spark detection unit 41, thereby more accurately detecting the generation of sparks in the heating chamber.

[0093] Alternatively, the first electromagnetic shield may include a first choke portion 38 (first choke structure) for suppressing electromagnetic waves from leaking from the heating chamber. According to this structure, the first electromagnetic shield can be optimally configured, and the spark electromagnetic wave in the space of the first electromagnetic shield can be detected by the spark detection portion 41, thereby more accurately detecting the generation of sparks in the heating chamber.

[0094] In addition, the microwave irradiation unit 31 may be configured to irradiate electromagnetic waves of a frequency of 2.45 GHz band or 915 MHz band into the heating chamber. According to this configuration, a heating device can be realized using electromagnetic waves of a usable frequency band.

[0095] (Second Embodiment)

[0096] Figure 7 It is a structural diagram of a microwave heating device 30, a water tank 2, a drum 3, a door 5, a control device 20, etc., for explaining a heating device according to a second embodiment.

[0097] In the example of the heating device according to the first embodiment, Figure 2 In the embodiment, the microwave receiving unit 36 ​​is provided inside the first electromagnetic wave shielding body including the wall and the door body 5 forming the heating chamber, and receives the electromagnetic waves in the space of the first electromagnetic wave shielding body. Here, since the electromagnetic waves irradiated from the microwave irradiation unit 31 have a strong intensity, when the spark detection unit 41 detects the spark electromagnetic waves, the electromagnetic waves irradiated from the microwave irradiation unit 31 may become noise. In other words, it becomes a factor that hinders the detection of the generation of sparks.

[0098] In the microwave heating device 30 constituting the heating device according to the second embodiment, Figure 7 As shown, the microwave receiving unit 36 ​​is arranged on the outside of the first electromagnetic wave shielding body to receive the electromagnetic waves leaked to the outside of the first electromagnetic wave shielding body. Since the first electromagnetic wave shielding body has a high shielding effect for a specific frequency band, when the electromagnetic waves leak to the outside of the first electromagnetic wave shielding body, the attenuation rate of the microwaves irradiated from the microwave irradiation unit 31 is higher than the attenuation rate of the electromagnetic waves generated by the sparks. Therefore, on the outside of the first electromagnetic wave shielding body, the difference in intensity between the microwaves irradiated from the microwave irradiation unit 31 and the electromagnetic waves generated by the sparks becomes smaller. Therefore, by receiving the electromagnetic waves by the microwave receiving unit 36, the microwave detection unit 41 can more accurately detect the electromagnetic waves generated by the sparks, thereby detecting the generation of the sparks.

[0099] In addition, the microwave receiving unit 36 ​​can be arranged outside the first electromagnetic wave shielding body, and the setting position is not particularly limited. For example, it can be arranged in the drum-type washing and drying machine 60, or it can be arranged independently of the drum-type washing and drying machine 60. In the case of being arranged independently of the drum-type washing and drying machine 60, for example, a mobile terminal or an independent measuring device can also be used. The microwave receiving unit 36 ​​is connected to the microwave control device 40 through a wired signal or a wireless signal. Other structures and operations are the same as those of the first embodiment.

[0100] Similar to the first embodiment, the first electromagnetic wave shielding body may also include a first choke portion 38 in order to block or attenuate electromagnetic waves leaking from the gap between the door body 5 and the water tank 2. The first choke portion 38 is formed at the junction of the door body 5 and the water tank 2 and has a high shielding effect for the frequency band of microwaves irradiated from the microwave irradiation portion 31.

[0101] Since the first electromagnetic shield using the choke structure has a high shielding effect for a specific frequency band, when electromagnetic waves leak to the outside of the first electromagnetic shield, the attenuation rate of microwaves irradiated from the microwave irradiation unit 31 is higher than the attenuation rate of electromagnetic waves generated by sparks.

[0102] Therefore, outside the first electromagnetic wave shielding body using a choke structure, the difference in intensity between the microwaves irradiated from the microwave irradiation unit 31 received in the microwave receiving unit 36 ​​and the electromagnetic waves generated by the spark becomes smaller, and the microwave detection unit 41 can detect the spark electromagnetic waves, thereby detecting the spark more accurately.

[0103] In addition, by providing the first electromagnetic wave shield and the first choke unit 38, there is no need to add an attenuator or the like to the microwave receiving unit 36. Thus, the structure of the drum-type washing and drying machine 60 can be simplified, thereby reducing the manufacturing cost and size of the drum-type washing and drying machine 60. Of course, only the first electromagnetic wave shield may be provided.

[0104] Figure 8 This is an explanatory diagram showing the relationship between the intensity of the electromagnetic wave inside the first electromagnetic shielding body and the intensity of the electromagnetic wave (leakage electromagnetic wave) leaking to the outside of the first electromagnetic shielding body in the microwave irradiated from the microwave irradiation portion 31 of the heating device involved in the second embodiment. The vertical axis represents the electromagnetic wave intensity of the microwave. If the electromagnetic wave intensity of the microwave injected into the drum 3 from the microwave irradiation port 32 is set to 100%, the intensity of the reflected wave reflected from the drum 3 and returned to the microwave irradiation portion 31 is about 17%, and the intensity of the electromagnetic wave leaking to the outside of the first electromagnetic shielding body is about 0.0001%.

[0105] In this way, the intensity of the leakage electromagnetic wave received by the microwave receiving unit 36 ​​outside the first electromagnetic wave shield is quite weak compared to the intensity of the incident wave. By arranging the microwave receiving unit 36 ​​outside the first electromagnetic wave shield, the detection of the spark electromagnetic wave becomes easy.

[0106] As described above, according to the present embodiment, the microwave receiving unit 36 ​​is arranged outside the first electromagnetic wave shielding body, and is configured to receive electromagnetic waves leaked from the first electromagnetic wave shielding body. Thus, the microwave receiving unit 36 ​​arranged outside the electromagnetic wave shielding body can receive electromagnetic waves leaked from the first electromagnetic wave shielding body, and the spark electromagnetic waves in the space of the first electromagnetic wave shielding body can be detected by the spark detection unit 41, thereby more accurately detecting the generation of sparks in the heating chamber.

[0107] In addition, the first electromagnetic shield may also include a first choke portion 38 (first choke structure) for suppressing leakage of electromagnetic waves irradiated from the microwave irradiation portion 31 from the heating chamber. Thus, the first electromagnetic shield can be optimally configured, and the spark electromagnetic wave can be detected by the spark detection portion 41, thereby more accurately detecting the generation of sparks.

[0108] (Third Embodiment)

[0109] Fig. 9 3 is a structural diagram for explaining a microwave heating device 30, a water tank 2, a drum 3, a door 5, a control device 20, etc. of a heating device according to the second embodiment. Figure 7 In the microwave heating device 30 according to the third embodiment, a microwave receiving unit 36 ​​is provided on the outside of the first electromagnetic wave shielding body to receive electromagnetic waves leaking to the outside of the first electromagnetic wave shielding body. In the microwave heating device 30 according to the third embodiment, a second electromagnetic wave shielding body 37 is provided around the microwave receiving unit 36, and the second electromagnetic wave shielding body 37 is configured to suppress the intrusion of microwaves irradiated from the microwave irradiation unit 31. Moreover, the microwave receiving unit 36 ​​is provided on the inside of the second electromagnetic wave shielding body 37 to receive electromagnetic waves intruding into the second electromagnetic wave shielding body 37.

[0110] Since the second electromagnetic wave shielding body 37 has a high shielding effect for a specific frequency band, when the electromagnetic wave intrudes into the second electromagnetic wave shielding body 37, the attenuation rate of the microwave irradiated from the microwave irradiation unit 31 is higher than the attenuation rate of the electromagnetic wave generated by the spark. Therefore, inside the second electromagnetic wave shielding body 37, the difference in intensity between the microwave irradiated from the microwave irradiation unit 31 and the electromagnetic wave generated by the spark becomes smaller. Therefore, by receiving the electromagnetic wave by the microwave receiving unit 36, the microwave detection unit 41 can more accurately detect the electromagnetic wave generated by the spark, thereby detecting the generation of the spark.

[0111] In addition, the second electromagnetic wave shield 37 may also be configured to include a second choke portion 39 at the connection point with the water tank 2. The second choke portion 39 has a high shielding effect for the frequency band of microwaves irradiated from the microwave irradiation portion 31. As the second choke portion 39, any choke structure known in the technical field of microwave ovens and the like can be adopted.

[0112] Since the second electromagnetic shield 37 using the choke structure has a high shielding effect for a specific frequency band, when electromagnetic waves enter the second electromagnetic shield 37, the attenuation rate of microwaves irradiated from the microwave irradiation unit 31 is higher than the attenuation rate of electromagnetic waves generated by sparks.

[0113] Therefore, inside the second electromagnetic wave shielding body 37 using a choke structure, the difference in intensity between the microwaves irradiated from the microwave irradiation unit 31 received in the microwave receiving unit 36 ​​and the electromagnetic waves generated by the spark becomes smaller, and the microwave detection unit 41 can detect the spark electromagnetic waves, thereby detecting the spark more accurately.

[0114] In addition, by providing the first electromagnetic wave shield, the second electromagnetic wave shield 37, the first choke 38, and the second choke 39, there is no need to add a structure such as an attenuator to the microwave receiving unit 36. As a result, the structure of the drum-type washing and drying machine 60 can be simplified, and thus the manufacturing cost and size of the drum-type washing and drying machine 60 can be suppressed. Of course, it is also possible to have a structure in which the first choke 38 and the second choke 39 are not provided in the first electromagnetic wave shield and the second electromagnetic wave shield 37, or it is also possible to have a structure in which either the first choke 38 or the second choke 39 is provided.

[0115] Alternatively, the first electromagnetic wave shielding body may be used to implement the aforementioned standards related to leakage electromagnetic waves, and the attenuation rates of the first electromagnetic wave shielding body and the second electromagnetic wave shielding body 37 may be set in such a manner that the intensity of the electromagnetic waves is suitable for the microwave receiving unit 36 ​​to receive the electromagnetic waves generated by sparks.

[0116] The other structures and operations are the same as those of the first embodiment. Alternatively, they may be the same as those of the second embodiment. In addition, only a part of the microwave receiving unit 36 ​​may be disposed inside the second electromagnetic shielding body 37 to receive electromagnetic waves intruding into the second electromagnetic shielding body 37.

[0117] As described above, according to this embodiment, the drum-type washing and drying machine 60 serving as a heating device has a second electromagnetic wave shielding body 37, which is used to suppress the intrusion of electromagnetic waves irradiated from the microwave irradiation unit 31, and the microwave receiving unit 36 ​​is arranged on the inner side of the second electromagnetic wave shielding body 37, and is configured to receive electromagnetic waves invading the second electromagnetic wave shielding body 37.

[0118] According to this structure, the microwave receiving unit 36 ​​arranged inside the second electromagnetic wave shielding body 37 can receive the electromagnetic waves invading the second electromagnetic wave shielding body 37, and the spark electromagnetic waves in the space of the first electromagnetic wave shielding body can be detected by the spark detection unit 41, thereby more accurately detecting the generation of sparks.

[0119] Alternatively, the second electromagnetic wave shielding body 37 may be disposed in the space of the first electromagnetic wave shielding body. Thus, the microwave receiving unit 36 ​​disposed in the space of the first electromagnetic wave shielding body and disposed on the inner side of the second electromagnetic wave shielding body 37 can receive the electromagnetic waves intruding into the second electromagnetic wave shielding body 37, and the spark electromagnetic waves can be detected by the spark detection unit 41, thereby more accurately detecting the generation of sparks.

[0120] In addition, the second electromagnetic shield 37 may include a second choke portion 39 (second choke structure) for suppressing the intrusion of electromagnetic waves irradiated from the microwave irradiation portion 31. Thus, the second electromagnetic shield 37 can be optimally configured, and the spark electromagnetic wave can be detected by the spark detection portion 41, thereby more accurately detecting the generation of sparks.

[0121] In addition, if Fig.10 As shown, in other structures of the heating device involved in the third embodiment, the microwave receiving unit 36, the second electromagnetic wave shielding body 37 and the second choke unit 39 can also be arranged outside the first electromagnetic wave shielding body, and their arrangement positions are not particularly limited. For example, it can be arranged in the drum-type washing and drying machine 60, or it can be arranged independently of the drum-type washing and drying machine 60. In the case of being arranged independently of the drum-type washing and drying machine 60, for example, a mobile terminal or an independent measuring device can also be used. The microwave receiving unit 36 ​​is connected to the microwave control device 40 by a wired signal or a wireless signal.

[0122] According to this structure, since the first electromagnetic shield and the second electromagnetic shield 37 have a high shielding effect for a specific frequency band, compared with the structure having only the first electromagnetic shield (see the second embodiment) Figure 7 ), when electromagnetic waves invade the second electromagnetic wave shielding body 37, the attenuation rate of the microwaves irradiated from the microwave irradiation unit 31 becomes higher than that of the electromagnetic waves generated by the sparks. Therefore, inside the second electromagnetic wave shielding body 37, the difference in intensity between the microwaves irradiated from the microwave irradiation unit 31 and the electromagnetic waves generated by the sparks becomes smaller. Therefore, by receiving electromagnetic waves by the microwave receiving unit 36, the electromagnetic waves generated by the sparks can be detected more accurately, thereby detecting the generation of the sparks.

[0123] As described above, the first to third embodiments describe a heating device and a washing and drying machine (dryer) having the heating device. That is, by providing the drying machine with the heating device of the first to third embodiments, a drying machine capable of more accurately detecting the generation of sparks can be realized.

[0124] The present disclosure is described above based on the first to third embodiments. It should be understood by those skilled in the art that these embodiments are illustrative, and the combination of their various components and various processing techniques can have various variations, and such variations are also included in the scope of the present disclosure. In other words, the technology in the present disclosure is not limited thereto, and can also be applied to embodiments obtained by changes, substitutions, additions, omissions, etc. In addition, it is also possible to combine the various components described in the above embodiments to form new embodiments.

[0125] Furthermore, arbitrary combinations of the above-described constituent elements and modes in which the present disclosure is expressed in the form of methods, apparatuses, systems, recording media, computer programs, and the like are converted into additional modes of the present disclosure.

[0126] As described above, the heating device in the first disclosure includes: a heating chamber that accommodates a heating object; an irradiation unit that irradiates electromagnetic waves into the heating chamber; and a first electromagnetic wave shielding body that is used to suppress electromagnetic waves leaking from the heating chamber. In addition, it includes: a receiving unit that receives electromagnetic waves; and a detection unit that detects electromagnetic waves generated by sparks among the electromagnetic waves received by the receiving unit, and the sparks are generated in the heating chamber due to the irradiation of the electromagnetic waves. In addition, the detection unit is configured to detect electromagnetic waves amplified in the space of the first electromagnetic wave shielding body.

[0127] According to this configuration, the detector of the heating device can more accurately detect the generation of sparks in the heating chamber by detecting the electromagnetic waves amplified in the space of the first electromagnetic wave shielding body.

[0128] Regarding the heating device in the second disclosure, it may also be that in the first disclosure, the maximum straight line length among the x-axis length, y-axis length and z-axis length of the space constituting the first electromagnetic wave shielding body is set to Lmax, and the detection unit is configured to detect electromagnetic waves with a wavelength λ satisfying (λ / 2)≤Lmax.

[0129] According to this configuration, the detection unit can more accurately detect the generation of sparks in the heating chamber by detecting the electromagnetic waves amplified in the space of the first electromagnetic wave shielding body.

[0130] Regarding the heating device in the third disclosure, in either the first disclosure or the second disclosure, the detection unit may be configured to detect electromagnetic waves having a frequency of 5 GHz or less among electromagnetic waves generated by sparks generated in the heating chamber.

[0131] According to this configuration, the generation of sparks in the heating chamber can be detected more accurately.

[0132] Regarding the heating device in the fourth disclosure, in any one of the first to third disclosures, the receiving unit may be provided outside the first electromagnetic shielding body and configured to receive electromagnetic waves leaked from the first electromagnetic shielding body.

[0133] According to this configuration, the receiving unit provided outside the first electromagnetic shielding body receives electromagnetic waves leaking from the first electromagnetic shielding body, and the detecting unit detects electromagnetic waves amplified in the space of the first electromagnetic shielding body, thereby more accurately detecting the generation of sparks in the heating chamber.

[0134] Regarding the heating device in the fifth disclosure, in any one of the first to fourth disclosures, the first electromagnetic wave shield may include at least a wall forming a heating chamber and a door for allowing a heating object to enter and exit the heating chamber.

[0135] According to this configuration, the first electromagnetic shield is optimally configured, and the electromagnetic waves amplified in the space of the first electromagnetic shield are detected by the detector, thereby more accurately detecting the generation of sparks in the heating chamber.

[0136] Regarding the heating device in the sixth disclosure, in any one of the first to fifth disclosures, the first electromagnetic wave shield may include a first choke structure for suppressing leakage of electromagnetic waves from the heating chamber.

[0137] According to this configuration, the first electromagnetic shield is optimally configured, and the electromagnetic waves amplified in the space of the first electromagnetic shield are detected by the detector, thereby more accurately detecting the generation of sparks in the heating chamber.

[0138] Regarding the heating device in the seventh disclosure, it can also be a structure as follows: in any one of the first to third disclosures, it is provided with a second electromagnetic wave shielding body, which is used to suppress the intrusion of electromagnetic waves irradiated from the irradiation part, and the receiving part is arranged on the inner side of the second electromagnetic wave shielding body to receive the electromagnetic waves invading the second electromagnetic wave shielding body.

[0139] According to this configuration, the receiving unit provided inside the second electromagnetic shield receives electromagnetic waves intruding into the second electromagnetic shield, and the detecting unit detects electromagnetic waves amplified in the space of the first electromagnetic shield, thereby more accurately detecting the generation of sparks in the heating chamber.

[0140] Regarding the heating device in the eighth disclosure, in the seventh disclosure, the second electromagnetic wave shielding body may be provided in a space of the first electromagnetic wave shielding body.

[0141] According to this structure, the receiving unit arranged in the space of the first electromagnetic wave shielding body and on the inner side of the second electromagnetic wave shielding body can receive the electromagnetic waves that invade the second electromagnetic wave shielding body, and the detection unit can detect the electromagnetic waves amplified in the space of the first electromagnetic wave shielding body, thereby more accurately detecting the generation of sparks in the heating chamber.

[0142] Regarding the heating device in the ninth disclosure, in either the seventh disclosure or the eighth disclosure, the second electromagnetic shield may include a second choke structure for suppressing the intrusion of electromagnetic waves irradiated from the irradiation unit.

[0143] According to this configuration, the second electromagnetic shield is optimally configured, and the electromagnetic wave amplified in the space of the first electromagnetic shield is detected by the detector, thereby more accurately detecting the generation of sparks in the heating chamber.

[0144] Regarding the heating device in the tenth disclosure, in any one of the first to ninth disclosures, the irradiation unit may be configured to irradiate electromagnetic waves having a frequency in the 2.45 GHz band or the 915 MHz band into the heating chamber.

[0145] According to this configuration, the heating device can be realized by utilizing electromagnetic waves in a usable frequency band.

[0146] The dryer in the eleventh disclosure may include any one of the heating devices in the first to tenth disclosures.

[0147] According to this configuration, it is possible to provide a dryer capable of more accurately detecting the generation of sparks in the heating chamber.

[0148] Industrial Applicability

[0149] As mentioned above, the application scope of the present disclosure is not limited to the drum-type washing and drying machine or drum-type drying machine described above. For example, it can also be applied to a hanging drying method other than a drum-type, a vertical washing and drying machine of a pulsator type, or a vertical drying machine. In addition, as long as it is a heating device that uses electromagnetic waves for heating, it can also be applied when the heating object is an object other than clothing.

[0150] Description of Reference Numerals

[0151] 1: Shell; 2: Water tank (heating chamber); 2a: Front of water tank; 2b: Rear of water tank; 2c: Opening of water tank; 3: Drum; 3a: Front of drum; 3b: Rear of drum; 3c: Opening of drum; 4: Shock absorber; 5: Door; 6: Driving motor; 7: Circulating air path; 8: Blowing outlet; 9: Discharge outlet; 10: Drain valve; 11: Drain pipe; 12: Water supply valve; 13: Water supply pipe; 16: Blowing fan; 17: Heater; 18: Inflow temperature detection unit; 19: Opening; 20: Control device; 21: Dehumidification unit; 22: lint filter; 23: water seal; 30: microwave heating device; 31: microwave irradiation unit (irradiation unit); 32: microwave irradiation port; 33: reflection unit; 34: waveguide; 36: microwave receiving unit (receiving unit); 37: second electromagnetic wave shielding body; 38: first choke unit (first choke structure); 39: second choke unit (second choke structure); 40: microwave control device; 41: spark detection unit (detection unit); 42: output adjustment unit; 60: drum-type washing and drying machine (dryer).

Claims

1. A heating device comprising: A heating chamber that accommodates a heating object; an irradiation unit for irradiating electromagnetic waves into the heating chamber; a first electromagnetic wave shielding body for preventing the electromagnetic wave irradiated by the irradiation unit from leaking from the heating chamber; a receiving unit that receives electromagnetic waves; and a detection unit that detects electromagnetic waves generated by sparks among the electromagnetic waves received by the receiving unit, the sparks being generated in the heating chamber due to irradiation of the electromagnetic waves, in, The receiving unit is disposed outside the first electromagnetic wave shielding body and receives electromagnetic waves leaked from the first electromagnetic wave shielding body. The detection unit detects electromagnetic waves amplified in the space of the first electromagnetic wave shield.

2. The heating device according to claim 1, characterized in that The maximum straight line length among the x-axis length, y-axis length, and z-axis length of the space constituting the first electromagnetic shield is defined as Lmax. The detection unit detects electromagnetic waves whose wavelength λ satisfies (λ / 2)≤Lmax.

3. The heating device according to claim 1 or 2, characterized in that: The detection unit detects electromagnetic waves having a frequency of 5 GHz or less among electromagnetic waves generated by sparks generated in the heating chamber.

4. The heating device according to claim 1 or 2, characterized in that: The first electromagnetic wave shielding body includes at least a wall forming the heating chamber and a door body for allowing the heating object to enter and exit the heating chamber.

5. The heating device according to claim 1 or 2, characterized in that: The first electromagnetic wave shield includes a first choke structure for suppressing leakage of the electromagnetic wave irradiated by the irradiation unit from the heating chamber.

6. The heating device according to claim 1 or 2, characterized in that: The irradiation unit irradiates electromagnetic waves having a frequency in the 2.45 GHz band or the 915 MHz band into the heating chamber.

7. A heating device comprising: A heating chamber that accommodates a heating object; an irradiation unit for irradiating electromagnetic waves into the heating chamber; a first electromagnetic wave shielding body for preventing the electromagnetic wave irradiated by the irradiation unit from leaking from the heating chamber; a second electromagnetic wave shielding body for suppressing the intrusion of electromagnetic waves irradiated from the irradiation part; a receiving unit that receives electromagnetic waves; and a detection unit that detects electromagnetic waves generated by sparks among the electromagnetic waves received by the receiving unit, the sparks being generated in the heating chamber due to irradiation of the electromagnetic waves, in, The receiving unit is disposed inside the second electromagnetic wave shielding body and receives electromagnetic waves intruding into the second electromagnetic wave shielding body. The detection unit detects electromagnetic waves amplified in the space of the first electromagnetic wave shield.

8. The heating device according to claim 7, characterized in that: The second electromagnetic wave shielding body is disposed in the space of the first electromagnetic wave shielding body.

9. The heating device according to claim 7, characterized in that: The second electromagnetic wave shield includes a second choke structure for suppressing the intrusion of electromagnetic waves irradiated from the irradiation unit.

10. The heating device according to any one of claims 7 to 9, characterized in that: The maximum straight line length among the x-axis length, y-axis length, and z-axis length of the space constituting the first electromagnetic shield is defined as Lmax. The detection unit detects electromagnetic waves whose wavelength λ satisfies (λ / 2)≤Lmax.

11. The heating device according to any one of claims 7 to 9, characterized in that: The detection unit detects electromagnetic waves having a frequency of 5 GHz or less among electromagnetic waves generated by sparks generated in the heating chamber.

12. The heating device according to any one of claims 7 to 9, characterized in that: The first electromagnetic wave shielding body includes at least a wall forming the heating chamber and a door body for allowing the heating object to enter and exit the heating chamber.

13. The heating device according to any one of claims 7 to 9, characterized in that: The first electromagnetic wave shield includes a first choke structure for suppressing leakage of the electromagnetic wave irradiated by the irradiation unit from the heating chamber.

14. The heating device according to any one of claims 7 to 9, characterized in that: The irradiation unit irradiates electromagnetic waves having a frequency in the 2.45 GHz band or the 915 MHz band into the heating chamber. 15 . A drying machine comprising the heating device according to claim 1 .

Images