CN114788408A - Heating device and dryer provided with same - Google Patents

Abstract

The heating device is provided with: a water tank (2) serving as a heating chamber for accommodating a heating object; a microwave irradiation unit (31) that irradiates electromagnetic waves into the heating chamber; a first electromagnetic wave shield for suppressing electromagnetic waves leaking from the heating chamber; and a microwave receiving unit (36) that receives electromagnetic waves. The microwave heating apparatus further comprises a spark detection unit for detecting an electromagnetic wave generated by a spark generated in the heating chamber by irradiation of the electromagnetic wave among the electromagnetic waves received by the microwave receiving unit (36). The spark detection unit detects the electromagnetic wave amplified in the space of the first electromagnetic wave shield.

Description

Heating device and dryer equipped with heating device

technical field

The present disclosure relates to a heating device for heating a heating object using microwaves, and a dryer provided with the heating device.

Background technique

As an example of the heating device, there is a clothes dryer that heats and dries clothes. As a method for increasing the drying performance of a clothes dryer and a washing and drying machine, there is a method of using microwaves as a heat source for heating moisture in clothes (for example, see Patent Document 1). According to this method, the moisture in the clothes can be directly heated by irradiating microwaves to the clothes, and the moisture in the clothes can be quickly evaporated. Therefore, the clothes can be dried in a short time compared with the conventional warm air drying using a heater and a heat pump. dry.

FIG. 11 is a block diagram of a conventional clothes dryer described in Patent Document 1. FIG. The clothes dryer includes: a microwave irradiation unit 101 that irradiates the clothes with microwaves; a clothes store 102 that accommodates the clothes; a blower 103 that introduces external air into the clothes store 102 and sends out the air in the clothes store 102; a heater 104, which is used for drying clothes; a microwave control part 105, which controls the microwave irradiation part 101; a microwave reflection detection part 106, which senses the state of reflection of microwaves;

The clothes dryer of this structure directly heats the moisture adhering to the clothes fibers by using microwaves, thereby shortening the drying time of the clothes especially when the moisture content of the clothes is about 30% or less.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2008-000249

SUMMARY OF THE INVENTION

However, in the conventional clothes dryer, when the clothes stored in the clothes storage room 102 have metals such as buttons and zippers, the electric field strength of the microwaves in the clothes storage room 102 may become strong and sparks may be generated. In order to cope with such a situation, a technology capable of detecting the generation of sparks is indispensable.

The present disclosure provides a technique for detecting the generation of sparks in a heating device that heats an object to be heated by irradiating electromagnetic waves.

The heating device of the present disclosure includes: a heating chamber that accommodates an object to be heated; an irradiation unit that irradiates electromagnetic waves into the heating chamber; and a first electromagnetic wave shield for suppressing electromagnetic waves leaking from the heating chamber. Further, it includes a receiving unit that receives electromagnetic waves, and a detection unit that detects electromagnetic waves generated by sparks generated in the heating chamber by irradiation of electromagnetic waves, among the electromagnetic waves received by the receiving unit. And the detection part detects the electromagnetic wave amplified in the space of the 1st electromagnetic wave shield.

According to the present disclosure, the detection portion 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 shield.

Description of drawings

FIG. 1 is a longitudinal cross-sectional view schematically showing a configuration of a drum-type washing and drying machine for explaining the heating device according to the first embodiment.

FIG. 2 is a configuration diagram of the heating device according to the first embodiment.

FIG. 3 is a configuration diagram of the heating device according to the first embodiment.

4 is a diagram illustrating the frequency and intensity of electromagnetic waves received by the microwave receiving unit of the heating device according to the first embodiment.

FIG. 5 is a schematic diagram illustrating conditions in which resonance of electromagnetic waves occurs in the heating device according to the first embodiment.

6 is an explanatory diagram showing the relationship between the frequency and attenuation of electromagnetic waves to water in the heating device according to the first embodiment.

7 is a configuration diagram of a heating device according to a second embodiment.

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

9 is a configuration diagram of a heating device according to a third embodiment.

FIG. 10 is another configuration diagram of the heating device according to the third embodiment.

Fig. 11 is a block diagram of a conventional clothes dryer.

Detailed ways

Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, unnecessary detailed descriptions are sometimes omitted. For example, a detailed description of a well-known matter or an overlapping description of substantially the same configuration may be omitted. This is to prevent the following description from becoming unnecessarily long and to make it easy for those skilled in the art to understand.

In addition, the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims by them.

(first embodiment)

As a heating apparatus, in 1st Embodiment, the washing-drying machine which heats and dries laundry, such as clothes, is demonstrated. In addition to this, the heating device may be a clothes dryer or a device for heating objects other than laundry.

FIG. 1 is a longitudinal cross-sectional view schematically showing a configuration of a drum-type washing and drying machine 60 for explaining the heating device according to 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-drying machine 60 of the present embodiment has a function of washing and drying laundry such as clothes, and also functions as a washing machine that performs only a washing function, also functions as a dryer that performs only a drying function, and also functions as a washing machine. Function and drying function of the washing and drying machine to function.

The drum-type washing and drying machine 60 has a function of heating the laundry by irradiating microwaves, which are one type of electromagnetic waves, on the laundry in the drum. First, the basic structure and operation of the drum-type washer-dryer 60 will be described, and then the details of the first electromagnetic wave shield for suppressing the leakage of microwaves from the housing in the drum-type washer-dryer 60 when microwaves are irradiated will be described in detail. .

The drum-type washing-drying machine 60 is provided with the water tank 2 as a heating chamber, and this water tank 2 is formed in the bottomed cylindrical shape which stores washing water. The water tank 2 is swingably supported in the casing 1 (main body) by the damper 4 provided below it. The drum 3 which accommodates laundry, which is a drying object, such as clothes, is provided in the water tub 2 so as to be rotatable. The drum 3 is also formed in a bottomed cylindrical shape. The drum 3 is arranged in such a manner that the rotation axis is horizontal. In other examples, the drum 3 may be installed so that the rotation axis is inclined forward and upward with respect to the horizontal, or may be installed so that the rotation axis is vertical. In the present embodiment, the heating chamber is described as the water tank 2 including the drum 3, but only the drum 3 may be used as the heating chamber.

A drive motor 6 is attached to the back surface of the water tank 2 . The drive motor 6 rotates the drum 3 in forward and reverse directions around the axis of rotation. The drum-type washing and drying machine 60 performs stirring, beating, rinsing, and drying of the laundry accommodated in the drum 3 by using the rotation of the drum 3 by the driving of the drive motor 6 .

An opening 19 and a door 5 for opening and closing the opening 19 are provided at positions facing the opening ends of the drum 3 and the water tub 2 on the front surface of the casing 1 . The user can put laundry into or take out from the drum 3 by opening the door body 5 .

The water tank 2 has a water tank front portion 2a having a water tank opening portion 2c provided at a position facing the opening portion 19 of the casing 1, and a water tank rear portion 2b provided at a position rearward of the water tank front portion 2a. The elastic cylindrical water seal 23 is provided so that the edge part of the water tank opening part 2c of the water tank front part 2a and the edge part of the opening part 19 may be connected over the entire circumference. When the user closes the door body 5 , the water seal 23 is pressed by the door body 5 to elastically deform, thereby ensuring the watertightness of the water tank 2 with respect to the outside of the machine.

The water tank front part 2a may be the top surface part of the water tank 2 formed in the bottomed cylindrical shape. In this case, the water tank rear part 2b may be the side surface part and the bottom surface part of a cylinder. The water tank front part 2a may include a part in front of the side part in addition to the top surface part of a cylinder. In this case, the water tank rear part 2b may be the remainder and bottom surface part behind the side surface part of a cylinder. The water tank rear portion 2b may include a part of the side surface of the top surface portion in addition to the side surface portion and the bottom surface portion of the water tank 2 . In this case, the water tank front part 2a may be the remaining part on the side of the water tank opening part 2c of the top surface part of the cylinder. The water tank front part 2a and the water tank rear part 2b may be manufactured integrally, or may be manufactured as a separate part, and the water tank 2 may be formed by connecting the water tank front part 2a and the water tank rear part 2b. When the water tank front part 2a and the water tank rear part 2b are manufactured as independent parts, the water seal seal is provided similarly to the water tank seal 23 in the connection part of the water tank front part 2a and the water tank rear part 2b.

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 for draining the water in the water tank 2 to the outside of the casing 1, ie, the outside of the machine, through the drain pipe 11 .

A shock absorber 4 is provided below the water tank 2 . The damper 4 supports the water tub 2 and attenuates the vibration of the water tub 2 caused by the displacement of the laundry in the drum 3 or the like during spin-drying or the like. A cloth amount detector (not shown) is attached to the damper 4 . The cloth amount detection unit detects the displacement amount by which the shaft of the damper 4 is displaced up and down due to a change in the weight of the clothes or the like 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 amount detected by the cloth amount detection unit.

The drum 3 has a drum front 3a having a drum opening 3c provided at a position facing the opening 19 of the casing 1, and a drum rear 3b provided rearward of the drum front 3a. The drum front portion 3a may be a top surface portion of the drum 3 formed in a cylindrical shape with a bottom. In this case, the drum rear portion 3b may be a side surface portion and a bottom surface portion of the cylinder. The drum front portion 3a may include a front part of the side surface part in addition to the top surface part of the cylinder. In this case, the drum rear part 3b may be the remainder and bottom surface part behind the side surface part of a cylinder. The drum rear portion 3b may include a part of the side surface 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 be the remaining portion on the drum opening portion 3c side of the top surface portion of the cylinder. The drum front part 3a and the drum rear part 3b may be manufactured integrally, or may be manufactured as an independent part, and the drum 3 may be formed by connecting the drum front part 3a and the drum rear part 3b.

The drum-type washing and drying machine 60 includes a circulating air passage 7 for circulating the air in the water tub 2 and the drum 3 , and a microwave heating device 30 for irradiating microwaves to drying objects in the drum 3 . The microwave heating device 30 constituting the heating section for heating the object to be dried enters the drum 3 from the microwave irradiation port 32 provided between the water tank opening 2c of the water tank 2 serving as the heating chamber and the opening 19 of the casing 1 Microwaves are irradiated to heat the moisture contained in the drying object in the drum 3 .

The circulation air duct 7 is configured as an air circulation air duct for drying the object to be dried in the drying process. The air circulation air path includes a water tank 2 and a drum 3 . The circulating air passage 7 is provided so as to connect the outlet 8 (air outlet for drying) provided on the bottom surface of the water tub 2 to the outlet 9 (air outlet for drying) provided in front of the side surface of the water tub 2 .

A lint filter 22 , a dehumidifier 21 , a heater 17 , and a blower fan 16 are provided in the circulation air passage 7 from the side of the discharge port 9 . The lint filter 22 is a filter having a nylon mesh, and captures the lint contained in the air flowing in the circulation air passage 7 . The dehumidifier 21 dehumidifies the air flowing in the circulation air passage 7 . The dehumidifier 21 may be either of a water-cooled type or an air-cooled type. The heater 17 heats the air flowing in the circulating air passage 7 . The dehumidifying part 21 and the heater 17 may be constituted by the evaporating part and the condensing part of the heat pump device. The blower fan 16 circulates the air in the water tank 2 and the drum 3 in the circulation air passage 7 .

The heater 17 and the microwave irradiation unit (details will be described later) constitute a heating unit that heats the object to be dried, and both are energized at the same time, or either one is energized. In addition, as a method of heating the object to be dried by the heating unit, there are a method of directly heating by microwave, and a method of heating circulating air by a heater or the like or indirectly by heating the inner wall of the drum 3 . The heating method and the like are not particularly limited. When there is a high possibility of sparks due to metal such as buttons, zippers, etc., which are objects to be dried, the output of microwaves irradiated into drum 3 from the microwave irradiation unit is reduced or stopped to switch to using the heater 17 Drying performed.

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 detection unit 18 is constituted by, for example, a thermistor or the like.

A control device 20 is provided in the casing 1 . The control device 20 controls the blower fan 16, the heater 17, the microwave irradiation unit, and the like. The control device 20 also controls the drive motor 6 , the water supply valve 12 , the drain valve 10 , and the like to sequentially execute the respective steps of washing, rinsing, and drying.

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

Next, the flow of the drying air will be 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 in a humid state due to the evaporated moisture flows into the circulation air passage 7 through the discharge port 9 provided in the water tank 2 . The air that has flowed into the circulation air passage 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 .

The air that has passed through the heater 17 is blown out into the drum 3 again through the air outlet 8 . In addition, in the clothes dryer which does not have a washing function, the water tank 2 for storing washing water, the water supply valve 12, the water supply pipe 13, the drain valve 10, and the drain pipe 11 are not provided. Further, the drum 3 functions as a heating chamber, and the connection between the rotating drum 3 and the circulating air passage 7 is configured such that the drum 3 slides on a sealing member such as a felt.

In the drum-type washing-drying machine 60 of the present embodiment, since the drum 3 is irradiated with microwaves, it is necessary to configure such that the intensity of electromagnetic waves leaking to the outside of the drum-type washing-drying machine 60 is the same as when the drum-type washing and drying machine 60 is used. below the reference value specified in the area. Therefore, the drum-type washing and drying machine 60 of the present embodiment includes a first electromagnetic wave shield for suppressing leakage of microwaves irradiated from the microwave irradiation port 32 .

As a standard related to leakage electromagnetic waves, there is, for example, the Japanese Industrial Standard "JIS C9250" prescribed for microwave ovens with a rated high frequency output of 2 kW or less for food heating using electromagnetic waves (microwaves) in the frequency 2.45 GHz band, and microwave ovens with attached devices therein. ". In 5.8 of the standard, "The power density of the leakage electric wave measured by the power density test of the leakage electric wave specified in 8.2.12 of the standard satisfies: (1) When the door is in the closed state, the power of the leakage electric wave The density is 1 mW/cm ² or less; (2) when the door is opened and fixed to the maximum position immediately before the oscillation stop device of the oscillating tube operates, the power density of the leaked electric wave is 5 mW/cm ² or less; The power density of leakage radio waves is 5 mW/cm ² or less in the state where the oscillation stop device other than the main oscillation stop device is installed.” In addition, the eighth appendix of the notification related to the interpretation of the "Ministerial Decree Prescribing Technical Standards for Electrical Appliances and Materials" prescribed in Paragraph 1 of Article 8 of the Electrical Appliances and Materials Safety Act for prescribing technical standards prescribed in the Ordinance of the Ministry of Economy, Trade and Industry Subparagraph 2(95) also provides substantially the same content. About the washing-drying machine, it is considered that the same reference|standard as a microwave oven is appropriate.

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

In the microwave oven, large vibrations do not occur when irradiated with microwaves, but in the drum-type washer-dryer 60 of the present embodiment, when the drum 3 is rotated during the drying process in order to improve drying efficiency, the drum 3 and the water tank 2 vibration. Therefore, the 1st electromagnetic wave shield of the drum-type washing-drying machine 60 of this embodiment has a structure which can suppress the microwave leaking from a clearance gap even when microwaves are irradiated while the drum 3 and the water tank 2 vibrate. Details are described later.

2 : is a block diagram of the microwave heating apparatus 30, the water tank 2, the drum 3, the door body 5, the control apparatus 20, etc. for demonstrating the heating apparatus which concerns on 1st Embodiment. About the water tank 2, the drum 3, and the door body 5, the positional relationship seen from the front surface position of the drum-type washing-drying machine 60 to the back is shown in FIG. 1. FIG. The position where the microwave irradiation port 32 is provided may be different from that in FIG. 2 as long as microwaves can be irradiated to the water tank 2 serving as the heating chamber. In addition, the positions at which the microwave heating device 30 and the control device 20 are installed may be different from those in FIG. 2 as long as they are outside the first electromagnetic wave shield.

The microwave heating device 30 has a microwave irradiation part 31 , a waveguide 34 , a microwave irradiation port 32 , a microwave control device 40 , a reflection part 33 , and a microwave receiving part 36 . The microwave irradiation unit 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 in the water tank 2 . The microwave control device 40 adjusts the output of the microwaves irradiated from the microwave irradiation unit 31 . The reflection part 33 is provided between the microwave irradiation part 31 and the microwave irradiation port 32 , and reflects and irradiates a part or all of the microwaves reflected from the drum 3 into the drum 3 . The microwave receiving portion 36 is provided inside the first electromagnetic wave shield, and receives electromagnetic waves including microwaves irradiated from the microwave irradiation portion 31 and electromagnetic waves generated by sparks.

The first electromagnetic wave shield is formed of a material containing an electromagnetic wave blocking material such as a metal capable of reflecting or absorbing microwaves. The first electromagnetic wave shield includes at least a wall forming the heating chamber and a door for allowing the object to be heated to enter and exit the heating chamber. Here, in the case where the heating chamber has a bottomed cylindrical shape, the wall forming the heating chamber includes a cylindrical side wall and a bottom surface. In FIG. 2 , the first electromagnetic wave shield is composed of a water tank 2 serving as a heating chamber and a door body 5 .

In addition, a part or all of the drum 3 or the casing 1 may be formed of a material containing an electromagnetic wave blocking material to form the first electromagnetic wave shield.

In addition, the first electromagnetic wave shield may be provided with a first choke portion 38 in order to block or attenuate electromagnetic waves leaking from the gap between the water tank 2 and the door 5 to suppress the electromagnetic wave. The first choke portion 38 is formed at the contact point between the water tank 2 and the door body 5 , and has a high shielding effect against the frequency band of the microwaves irradiated from the microwave irradiating portion 31 . The first choke portion 38 can employ any choke structure known in the technical field such as microwave ovens.

In addition, instead of the choke structure, the first electromagnetic wave shield may be made of a conductive material such as a metal capable of reflecting microwaves irradiated from the microwave irradiating portion 31 , or a dielectric capable of absorbing and attenuating microwaves through dielectric loss, magnetic loss, or the like or magnetic material.

The microwave irradiation unit 31 is a microwave oscillator such as a magnetron, and oscillates an electromagnetic wave having a frequency in the 2.45 GHz band that can be used by a microwave heating device. In addition, it is not limited to the 2.45 GHz frequency band allocated as an ISM (Industry Science Medical) frequency band, and electromagnetic waves of frequencies such as the 915 MHz frequency band allocated similarly may be used. The 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 moisture contained in drying objects such as clothes.

Among the microwaves irradiated into the drum 3 , a part of the microwaves that are not absorbed by the moisture contained in the drying object returns from the drum 3 through the microwave irradiation port 32 to the microwave irradiation section 31 as a reflected wave. The microwaves returned to the microwave irradiation unit 31 are converted into heat and treated as exhaust heat.

The reflection part 33 reflects part or all of the reflected wave reflected from the drum 3 and travels in the direction of returning to the microwave irradiation part 31 , and makes it re-inject into the drum 3 together with the microwaves irradiated from the microwave irradiation part 31 . Thereby, energy consumption can be reduced and drying time can be shortened.

FIG. 3 shows the configuration of the microwave control device 40 , the microwave receiving unit 36 , and the microwave irradiation unit 31 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.

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

The microwave control device 40 controls the microwave irradiation unit 31 in accordance with an instruction from the control device 20 in the cleaning process, the rinsing process, or the drying process controlled by the control device 20 . The microwave control device 40 heats the washing water in the washing process, or heats the rinsing water in the rinsing process, or heats the moisture contained in the drying object in the drying process, or heats the water attached to the laundry or the drying object. The bacteria of the material are heat sterilized. For this purpose, the microwave irradiation unit 31 is caused to irradiate the drum 3 with microwaves. In addition, when heating the washing water or the rinsing water, microwaves may be irradiated into the water tank 2 in which the washing water or the rinsing water is stored.

The spark detection unit 41 can detect that a spark is generated in the heating chamber by detecting the electromagnetic wave generated by the spark among the electromagnetic waves received by the microwave receiving unit 36 . For example, the spark detection unit 41 detects the occurrence of sparks by detecting changes in the intensity of the received electromagnetic waves. In addition, in order to improve the spark detection accuracy, the occurrence of sparks may be detected by detecting changes in the intensity of electromagnetic waves at a predetermined frequency. Hereinafter, the electromagnetic wave detected by the spark detection unit 41 as an electromagnetic wave generated by a spark from among the electromagnetic waves received by the microwave receiving unit 36 is referred to as a spark electromagnetic wave.

First, the frequency of the electromagnetic wave generated by the spark will be described.

FIG. 4 is a diagram illustrating the frequency and intensity of electromagnetic waves received by the microwave receiver in the heating device according to the first embodiment. Assuming that the clothes have metals such as buttons and zippers, it is assumed that a metal sheet is accommodated in the heating chamber. Furthermore, the relationship between the frequency and the intensity of the electromagnetic waves received by the microwave receiving unit 36 when a spark is generated by irradiating microwaves from the microwave irradiating unit 31 into the heating chamber will be described. The horizontal axis represents the frequency of the electromagnetic wave, and the vertical axis represents the intensity of the electromagnetic wave.

The electromagnetic waves received by the microwave receiving unit 36 include both microwaves irradiated from the microwave irradiating unit 31 and electromagnetic waves generated by sparks 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.

Here, the microwave receiving unit 36 includes a filter having frequency characteristics that block or attenuate the microwaves irradiated from the microwave irradiating unit 31 . This filter is, for example, a low-pass filter composed of hardware. Thereby, the electromagnetic wave intensity of the frequency band of the microwave irradiated from the microwave irradiation part 31 among the electromagnetic waves received by the microwave receiving part 36 is reduced.

Therefore, in the frequency band of the microwave irradiated from the microwave irradiating part 31, the peak of the intensity of the electromagnetic wave is not detected compared with the electromagnetic wave of other frequencies. In addition, the peak of the intensity of the electromagnetic wave is detected in the frequency band of 100 MHz or more, particularly in the vicinity of 100 MHz to 1.5 GHz, for the electromagnetic wave generated by the spark.

As described above, the frequency of electromagnetic waves generated by sparks is 100 MHz or more, and generation of sparks can be detected by receiving electromagnetic waves having a frequency different from that of microwaves irradiated from microwave irradiation unit 31 and detecting changes in the intensity of electromagnetic waves.

The electromagnetic wave generated by the spark is not an electromagnetic wave having only a specific frequency, but an electromagnetic wave having a wide range of frequencies above the 100 MHz frequency band.

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 whose frequency is different from the frequency of the microwave irradiated from the microwave irradiating unit 31 as a spark electromagnetic wave, thereby detecting the spark. production.

In addition, the microwave receiving unit 36 may use a filter (a low-pass filter, a band-rejection filter, or a high-pass filter) or the like having a frequency characteristic that blocks or attenuates the microwaves irradiated from the microwave irradiating unit 31 . To receive only the electromagnetic waves generated from the spark, the spark detection unit 41 detects the spark electromagnetic waves. In addition, the above-described frequency analysis and filter may be used in combination. In addition, the filter provided in the microwave receiving part 36 may be provided in the spark detection part 41.

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

The intensity of the electromagnetic wave generated by the spark is considerably weaker than the electromagnetic wave intensity of the microwave irradiated into the heating chamber from the microwave irradiating portion 31, and the irradiated microwave becomes noise. Therefore, it is sometimes difficult to detect electromagnetic waves generated by sparks.

Here, the resonance phenomenon of an electromagnetic wave is demonstrated. As described above, the electromagnetic wave generated by the spark is not an electromagnetic wave having only a specific frequency, but an electromagnetic wave having a wide range of frequencies in the frequency band of 100 MHz or more. Therefore, among the electromagnetic waves having a predetermined frequency or more, there is a possibility that a resonance phenomenon may occur in the space of the electromagnetic wave shield.

FIG. 5 is a schematic diagram illustrating conditions in which resonance of electromagnetic waves occurs in the heating device according to the first embodiment. Generally, in the space of the electromagnetic wave shield, the resonance phenomenon occurs when the distance between the opposing 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. FIG. 5 shows resonance phenomena when the distance between the opposing surfaces of the electromagnetic wave shield is 1, 2, and 3 times the wavelength λ of the electromagnetic wave.

For example, let Lmax be the maximum linear length among the x-axis length, y-axis length, and z-axis length in the space constituting the electromagnetic wave shield. Among the electromagnetic waves generated by the spark, the resonance phenomenon occurs in short electromagnetic waves whose half-wavelength λ/2 is equal to or less than Lmax. The intensity of the electromagnetic waves generated by the spark is amplified by the resonance phenomenon.

Therefore, the spark detection unit 41 can also selectively detect electromagnetic waves of a frequency that resonates according to the size of the space of the first electromagnetic wave shield among the electromagnetic waves generated by the spark to detect the electromagnetic waves of the sparks, thereby detecting the sparks with high accuracy. produce.

That is, as described above, when the maximum linear length of the x-axis length, y-axis length, and z-axis length in the space constituting the first electromagnetic wave shield is Lmax, the spark detection unit 41 satisfies (λ/2)≦ The electromagnetic wave detection of Lmax is a spark electromagnetic wave. Accordingly, the spark detection unit 41 can detect the generation of sparks in the heating chamber more accurately by detecting the electromagnetic waves generated by the sparks amplified in the space of the first electromagnetic wave shield as spark electromagnetic waves.

For example, the case where the first electromagnetic wave shield is formed in a substantially straight cylindrical shape will be described. In the shape of a right 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 as Lmax. Among the electromagnetic waves generated by the spark, the half-wavelength λ/2 of the electromagnetic waves is equal to or less than Lmax, a resonance phenomenon occurs. The intensity of the electromagnetic waves generated by the spark is amplified by the resonance phenomenon.

In addition, the case where the first electromagnetic wave shield is formed in a substantially rectangular parallelepiped shape will be described. Let Lmax be the longest straight line length among the three sides forming the rectangular parallelepiped shape. Among the electromagnetic waves generated by the spark, the resonance phenomenon occurs in short electromagnetic waves whose half-wavelength λ/2 is equal to or less than Lmax. The intensity of the electromagnetic waves generated by the spark is amplified by the phenomenon of resonance.

From the above, the spark detection unit 41 can detect the spark electromagnetic wave by selectively detecting the electromagnetic wave of the frequency that resonates according to the size of the space of the first electromagnetic wave shield among the electromagnetic waves generated by the spark, thereby detecting the spark with high accuracy. production.

Finally, the influence of the moisture contained in the clothes, which are objects to be heated, on electromagnetic waves generated by sparks during the drying operation of the drum-type washer-dryer 60 will be described.

6 is an explanatory diagram showing the relationship between the frequency and attenuation of electromagnetic waves to water in the heating device according to the first embodiment. The horizontal axis represents the frequency of the electromagnetic wave, and the vertical axis represents the loss of the electromagnetic wave.

From frequencies above 5 GHz, the degree of attenuation to water increases rapidly. Since the intensity of electromagnetic waves generated by sparks is weak, it becomes difficult to detect sparks when the degree of attenuation due to moisture contained in clothing increases. Therefore, the microwave receiver 36 can also receive electromagnetic waves including frequency components of 10 GHz or less, preferably 5 GHz or less, and thereby detect sparks with higher accuracy. In addition, the spark detection unit 41 may detect an electromagnetic wave containing a frequency component of 10 GHz or less, preferably 5 GHz or less, thereby detecting sparks with higher accuracy.

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

Then, when a 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 considers that the generation of sparks has been detected, and reduces the output of the microwaves irradiated from the microwave irradiation unit 31 . Alternatively, the output of the microwaves irradiated from the microwave irradiation unit 31 is stopped.

Thereby, the generation of sparks in the drum 3 can be accurately detected, and the output of the microwaves irradiated from the microwave irradiation unit 31 can be decreased or stopped. That is, damage to the drying object due to sparks generated by metal or the like contained in the drying object in the drum 3 is prevented.

As described above, according to the present embodiment, the drum-type washing and drying machine 60 as the heating device includes the water tub 2 or the drum 3 as the heating chamber, which accommodates the clothes as the heating object, and the microwave irradiation unit 31 which irradiates the heating chamber. electromagnetic waves; and a first electromagnetic wave shield for suppressing electromagnetic waves leaking from the heating chamber. In addition, the microwave receiver 36 is provided with a microwave receiver 36 that receives electromagnetic waves, and a spark detector 41 that detects electromagnetic waves generated by sparks, which are generated in the heating chamber by irradiation of the electromagnetic waves, among the electromagnetic waves received by the microwave receiver 36 . produced. Further, the spark detection unit 41 is configured to detect electromagnetic waves amplified in the space of the first electromagnetic wave shield.

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

In addition, the spark detection unit 41 may be configured so that the detection wavelength λ satisfies (λ/2 ) ≤ Lmax electromagnetic waves. According to this structure, the spark detection part 41 can detect the generation|occurrence|production of the spark in a heating chamber more accurately by detecting the electromagnetic wave amplified in the space of a 1st electromagnetic wave shield.

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.

In addition, the first electromagnetic wave shield may include at least a wall forming the heating chamber and a door for allowing the object to be heated to enter and exit the heating chamber. According to this configuration, the first electromagnetic wave shield can be configured optimally, and the spark detection unit 41 can detect spark electromagnetic waves in the space of the first electromagnetic wave shield, thereby more accurately detecting the generation of sparks in the heating chamber.

In addition, the first electromagnetic wave shield may include a first choke portion 38 (first choke structure) for suppressing leakage of electromagnetic waves from the heating chamber. According to this configuration, the first electromagnetic wave shield can be configured optimally, and the spark detection unit 41 can detect spark electromagnetic waves in the space of the first electromagnetic wave shield, thereby more accurately detecting the generation of sparks in the heating chamber.

Moreover, the microwave irradiation part 31 may be comprised so that the electromagnetic wave of the frequency of 2.45 GHz band or 915 MHz band may be irradiated into a heating chamber. According to this configuration, the heating device can be realized by utilizing the electromagnetic waves of the available frequency band.

(Second Embodiment)

FIG. 7 is a configuration diagram of the microwave heating device 30 , the water tank 2 , the drum 3 , the door 5 , the control device 20 , and the like for explaining the heating device according to the second embodiment.

In FIG. 2 showing the heating device according to the first embodiment, the microwave receiving unit 36 is provided inside the first electromagnetic wave shield including the wall and the door 5 forming the heating chamber, and receives the space of the first electromagnetic wave shield. electromagnetic waves inside. Here, since the electromagnetic waves irradiated from the microwave irradiation unit 31 are strong in intensity, the electromagnetic waves irradiated from the microwave irradiation unit 31 may become noise when the spark detection unit 41 detects spark electromagnetic waves. That is, it becomes a factor which hinders the detection of spark generation.

In the microwave heating device 30 constituting the heating device according to the second embodiment, as shown in FIG. 7 , the microwave receiving unit 36 is provided outside the first electromagnetic wave shield, and receives electromagnetic waves leaked to the outside of the first electromagnetic wave shield. . Since the first electromagnetic wave shield has a high shielding effect for a specific frequency band, when the electromagnetic wave leaks to the outside of the first electromagnetic wave shield, the attenuation rate of the microwave irradiated from the microwave irradiation part 31 is higher than the attenuation of the electromagnetic wave generated by the spark high rate. Therefore, on the outer side of the first electromagnetic wave shield, the difference between the intensity of the microwave irradiated from the microwave irradiating part 31 and the intensity of the electromagnetic wave generated by the spark becomes small. Therefore, by receiving the electromagnetic waves by the microwave receiving unit 36 , the microwave detecting unit 41 can more accurately detect the electromagnetic waves generated by the sparks, thereby detecting the generation of the sparks.

In addition, the microwave receiving part 36 should just be provided in the outer side of a 1st electromagnetic wave shield, and an installation position is not specifically limited. For example, it may be installed in the drum-type washing and drying machine 60, or may be installed independently of the drum-type washing and drying machine 60. When installed independently of the drum-type washing and drying machine 60, for example, a mobile terminal or an independent measuring device may be used. The microwave receiving unit 36 is connected to the microwave control device 40 by a wired signal or a wireless signal. Other structures and operations are the same as those of the first embodiment.

Like the first embodiment, the first electromagnetic wave shield may 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 contact point between the door body 5 and the water tank 2 , and has a high shielding effect against the frequency band of the microwaves irradiated from the microwave irradiating portion 31 .

Since the first electromagnetic wave shielding body using the choke structure has a high shielding effect for a specific frequency band, when the electromagnetic wave leaks to the outside of the first electromagnetic wave shielding body, the attenuation rate of the microwave irradiated from the microwave irradiating part 31 is higher than that of The electromagnetic wave generated by the spark has a high attenuation rate.

Therefore, on the outside of the first electromagnetic wave shield using the choke structure, the difference between the intensity of the microwave received by the microwave receiving portion 36 and irradiated from the microwave irradiating portion 31 and the electromagnetic wave generated by the spark is reduced, and the microwave detecting portion The 41 is able to detect spark electromagnetic waves for more accurate spark detection.

In addition, by providing the first electromagnetic wave shield and the first choke portion 38 , it is not necessary to add a structure such as an attenuator to the microwave receiving portion 36 . Thereby, since the structure of the drum-type washing-drying machine 60 can be simplified, the manufacturing cost and size of the drum-type washing-drying machine 60 can be suppressed. Of course, only the first electromagnetic wave shield may be provided.

8 shows the intensity of the electromagnetic wave inside the first electromagnetic wave shield and the electromagnetic wave leaking outside the first electromagnetic wave shield (leakage electromagnetic wave) among the microwaves irradiated from the microwave irradiation unit 31 of the heating device according to the second embodiment. ) is an explanatory diagram of the relationship between the intensities of . The vertical axis represents the electromagnetic wave intensity of the microwave. If the electromagnetic wave intensity of the microwaves injected from the microwave irradiation port 32 into the drum 3 is 100%, the intensity of the reflected wave reflected from the drum 3 and returned to the microwave irradiation part 31 is about 17%, which leaks to the first The intensity of the electromagnetic wave outside the electromagnetic wave shield is about 0.0001%.

In this way, the intensity of the leaked electromagnetic wave received by the microwave receiving portion 36 on the outside of the first electromagnetic wave shield is considerably weaker than the intensity of the incident wave. By arranging the microwave receiving portion 36 outside the first electromagnetic wave shield, the The detection of spark electromagnetic waves becomes easy.

As described above, according to the present embodiment, the microwave receiving unit 36 is provided on the outer side of the first electromagnetic wave shield, and is configured to receive electromagnetic waves leaked from the first electromagnetic wave shield. Thereby, the electromagnetic wave leaked from the first electromagnetic wave shield can be received by the microwave receiving part 36 provided outside the electromagnetic wave shield, and the spark electromagnetic wave in the space of the first electromagnetic wave shield can be detected by the spark detection part 41 , thereby more Accurately detects the generation of sparks in the heating chamber.

In addition, the first electromagnetic wave shield may include a first choke portion 38 (first choke structure) for suppressing the electromagnetic waves irradiated from the microwave irradiation portion 31 from Heating chamber leaks. Thereby, the first electromagnetic wave shield can be configured optimally, and the spark electromagnetic wave can be detected by the spark detection unit 41, whereby the generation of spark can be detected more accurately.

(third embodiment)

9 is a configuration diagram of a microwave heating device 30 , a water tank 2 , a drum 3 , a door 5 , a control device 20 , and the like for explaining the heating device according to the third embodiment. In FIG. 7 of the second embodiment, the microwave receiving unit 36 is provided outside the first electromagnetic wave shield, and receives electromagnetic waves leaking to the outside of the first electromagnetic wave shield. In the microwave heating device 30 according to the third embodiment, the second electromagnetic wave shielding body 37 is provided around the microwave receiving portion 36 , and the second electromagnetic wave shielding body 37 is configured to suppress the penetration of microwaves irradiated from the microwave irradiating portion 31 . . Further, the microwave receiving unit 36 is provided inside the second electromagnetic wave shielding body 37 , and receives electromagnetic waves that have penetrated into the second electromagnetic wave shielding body 37 .

Since the second electromagnetic wave shielding body 37 has a high shielding effect for a specific frequency band, when the electromagnetic wave penetrates into the second electromagnetic wave shielding body 37, the attenuation rate of the microwave irradiated from the microwave irradiation part 31 is higher than that of the electromagnetic wave generated by the spark. The decay rate is high. Therefore, in the inner side of the second electromagnetic wave shielding body 37, the difference between the intensity of the microwave irradiated from the microwave irradiating part 31 and the intensity of the electromagnetic wave generated by the spark becomes small. Therefore, by receiving the electromagnetic waves by the microwave receiving unit 36 , the microwave detecting unit 41 can more accurately detect the electromagnetic waves generated by the sparks, thereby detecting the generation of the sparks.

Moreover, the 2nd electromagnetic wave shielding body 37 may be comprised so that the 2nd choke part 39 may be included in the contact point with the water tank 2. As shown in FIG. The second choke portion 39 has a high shielding effect against the frequency band of the microwaves irradiated from the microwave irradiating portion 31 . As the second choke portion 39, any choke structure known in the technical field such as a microwave oven can be adopted.

Since the second electromagnetic wave shielding body 37 using the choke structure has a high shielding effect for a specific frequency band, when the electromagnetic wave penetrates into the second electromagnetic wave shielding body 37 , the attenuation rate of the microwave irradiated from the microwave irradiating part 31 is higher than The attenuation rate of electromagnetic waves generated by sparks is high.

Therefore, inside the second electromagnetic wave shielding body 37 using the choke structure, the difference between the intensity of the microwave received by the microwave receiving part 36 and irradiated from the microwave irradiating part 31 and the electromagnetic wave generated by the spark becomes small, and the microwave detection The part 41 can detect spark electromagnetic waves, thereby more accurately detecting sparks.

Further, by providing the first electromagnetic wave shielding body, the second electromagnetic wave shielding body 37 , the first choke portion 38 and the second choke portion 39 , it is not necessary to add a structure such as an attenuator to the microwave receiving portion 36 . Thereby, since the structure of the drum-type washing-drying machine 60 can be simplified, the manufacturing cost and size of the drum-type washing-drying machine 60 can be suppressed. Of course, the first and second electromagnetic wave shields 37 and 37 may not be provided with the first choke portion 38 and the second choke portion 39, or may be provided with the first choke portion 38 and the second choke portion The structure of any one of the flow sections 39 .

Alternatively, the first electromagnetic wave shield may be used to achieve the above-mentioned criteria regarding leakage of electromagnetic waves, and the intensity of the electromagnetic waves may be suitable for the microwave receiving unit 36 to receive electromagnetic waves generated by sparks. to set the attenuation rates of the first electromagnetic wave shield and the second electromagnetic wave shield 37 .

Other structures and operations are the same as those of the first embodiment. Alternatively, it may be the same as the second embodiment. In addition, only a part of the microwave receiving part 36 may be provided inside the second electromagnetic wave shielding body 37 to receive electromagnetic waves that have penetrated into the second electromagnetic wave shielding body 37 .

As described above, according to the present embodiment, the drum-type washing and drying machine 60 serving as a heating device includes the second electromagnetic wave shielding body 37 for suppressing the intrusion of electromagnetic waves irradiated from the microwave irradiating unit 31 and receiving the microwaves. The portion 36 is provided on the inner side of the second electromagnetic wave shielding body 37 , and is configured to receive electromagnetic waves that have penetrated into the second electromagnetic wave shielding body 37 .

According to this configuration, the microwave receiving portion 36 provided inside the second electromagnetic wave shield 37 can receive electromagnetic waves that have penetrated into the second electromagnetic wave shield 37, and the spark detection portion 41 can detect the electromagnetic wave in the space of the first electromagnetic wave shield. Spark electromagnetic waves, thereby detecting the generation of sparks more accurately.

In addition, the second electromagnetic wave shielding body 37 may be provided in the space of the first electromagnetic wave shielding body. As a result, the microwave receiving portion 36 provided in the space of the first electromagnetic wave shield and provided inside the second electromagnetic wave shield 37 can receive electromagnetic waves that have penetrated into the second electromagnetic wave shield 37 , and the spark detection portion 41 The spark electromagnetic wave is detected, thereby detecting the spark generation more accurately.

In addition, the second electromagnetic wave shielding body 37 may include a second choke portion 39 (second choke structure) for suppressing irradiation from the microwave irradiation portion 31 . the intrusion of electromagnetic waves. Thereby, the second electromagnetic wave shielding body 37 can be configured optimally, and the spark electromagnetic wave can be detected by the spark detection unit 41, so that the generation of sparks can be detected more accurately.

In addition, as shown in FIG. 10 , in another configuration of the heating device according to the third embodiment, the microwave receiving unit 36 , the second electromagnetic wave shielding body 37 , and the second choke unit 39 may be provided in the first electromagnetic wave On the outside of the shield body, their installation positions are not particularly limited. For example, it may be installed in the drum-type washing and drying machine 60, or may be installed independently of the drum-type washing and drying machine 60. When installed independently of the drum-type washing and drying machine 60, for example, a mobile terminal or an independent measuring device may be used. The microwave receiving unit 36 is connected to the microwave control device 40 by a wired signal or a wireless signal.

According to this configuration, since the first electromagnetic wave shielding body and the second electromagnetic wave shielding body 37 have a high shielding effect with respect to a specific frequency band, compared with the configuration including only the first electromagnetic wave shielding body (refer to the diagram showing the second embodiment) 7), when an electromagnetic wave penetrates into the 2nd electromagnetic wave shielding body 37, the attenuation rate of the microwave irradiated from the microwave irradiation part 31 becomes higher than the electromagnetic wave generated by a spark. Therefore, in the inner side of the second electromagnetic wave shielding body 37, the difference between the intensity of the microwave irradiated from the microwave irradiating part 31 and the intensity of the electromagnetic wave generated by the spark is further reduced. Therefore, by receiving the electromagnetic wave by the microwave receiver 36, the electromagnetic wave generated by the spark can be detected more accurately, and the generation of the spark can be detected.

As described above, in the first to third embodiments, the heating device and the washing and drying machine (dryer) provided with the heating device have been described. That is, by including the heating device of the first to third embodiments in the dryer, it is possible to realize a dryer that can more accurately detect the generation of sparks.

The present disclosure has been described above based on the first to third embodiments. It should be understood by those skilled in the art that these embodiments are examples, and that various modifications can be made to the combination of each of their constituent elements and each processing process, and that such modifications are also included in the scope of the present disclosure. That is, the technology in the present disclosure is not limited to this, and can be applied to an embodiment obtained by performing changes, substitutions, additions, omissions, and the like. In addition, it is also possible to form a new embodiment by combining the respective constituent elements described in the above-mentioned embodiment.

In addition, an arbitrary combination of the above-mentioned constituent elements, and a form obtained by converting the expression of the present disclosure among methods, apparatuses, systems, recording media, computer programs, and the like are also effective as forms of the present disclosure.

As described above, the heating device in the first publication includes: a heating chamber that accommodates an object to be heated; an irradiation unit that irradiates electromagnetic waves into the heating chamber; and a first electromagnetic wave shield for suppressing leakage from the heating chamber. electromagnetic waves. Further, it includes a receiving unit that receives electromagnetic waves, and a detection unit that detects electromagnetic waves generated by sparks generated in the heating chamber by irradiation of electromagnetic waves, among the electromagnetic waves received by the receiving unit. And the detection part is comprised so that the electromagnetic wave amplified in the space of the 1st electromagnetic wave shield may be detected.

According to this structure, the detection part of a heating apparatus can detect the generation|occurrence|production of sparks in a heating chamber more accurately by detecting the electromagnetic wave amplified in the space of a 1st electromagnetic wave shield.

Regarding the heating device in the second disclosure, in the first disclosure, the maximum linear length among the x-axis length, the y-axis length, and the z-axis length of the space constituting the first electromagnetic wave shield may be set to Lmax, and the detection may be performed. The part is configured to detect electromagnetic waves whose wavelength λ satisfies (λ/2)≦Lmax.

According to this structure, the detection part can detect the generation|occurrence|production of the spark in a heating chamber more accurately by detecting the electromagnetic wave amplified in the space of a 1st electromagnetic wave shield.

Regarding the heating device in the third publication, in any one of the first publication or the second publication, the detection unit may be configured to detect electromagnetic waves generated by sparks generated in the heating chamber having a frequency of 5 GHz or less. of electromagnetic waves.

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

Regarding the heating device in the fourth publication, in any one of the first to third publications, the receiving portion may be provided outside the first electromagnetic wave shield, and may be configured to receive leakage from the first electromagnetic wave shield. of electromagnetic waves.

According to this configuration, the electromagnetic wave leaked from the first electromagnetic wave shield can be received by the receiving unit provided outside the first electromagnetic wave shield, and the electromagnetic wave amplified in the space of the first electromagnetic wave shield can be detected by the detection unit. More accurate detection of spark generation in heating chambers.

Regarding the heating device in the fifth publication, in any one of the first to fourth publications, the first electromagnetic wave shield may include at least a wall forming a heating chamber and a wall for allowing the object to be heated to enter and exit the heating chamber. the door body.

According to this configuration, the first electromagnetic wave shield can be configured optimally, and the generation of sparks in the heating chamber can be detected more accurately by detecting the electromagnetic waves amplified in the space of the first electromagnetic wave shield by the detector.

Regarding the heating device in the sixth publication, in any one of the first to fifth publications, the first electromagnetic wave shield may include a first choke structure for suppressing electromagnetic waves. Leak from heating chamber.

According to this configuration, the first electromagnetic wave shield can be configured optimally, and the generation of sparks in the heating chamber can be detected more accurately by detecting the electromagnetic waves amplified in the space of the first electromagnetic wave shield by the detector.

The heating device in the seventh publication may be configured to include a second electromagnetic wave shield for suppressing irradiation from the irradiation unit in any one of the first to third publications The receiving part is arranged inside the second electromagnetic wave shielding body, and receives the electromagnetic waves that have penetrated into the second electromagnetic wave shielding body.

According to this configuration, the electromagnetic wave entering the second electromagnetic wave shield can be received by the receiver provided inside the second electromagnetic wave shield, and the electromagnetic wave amplified in the space of the first electromagnetic wave shield can be detected by the detector. More accurate detection of spark generation in heating chambers.

Regarding the heating device in the eighth disclosure, in the seventh disclosure, the second electromagnetic wave shield may be provided in the space of the first electromagnetic wave shield.

According to this configuration, the electromagnetic wave intruding into the second electromagnetic wave shield can be received by the receiving part provided in the space of the first electromagnetic wave shield and provided inside the second electromagnetic wave shield, and the detection part can detect the electromagnetic wave in the first electromagnetic wave shield by the detection part. The electromagnetic wave amplified in the space of the body is used to more accurately detect the generation of sparks in the heating chamber.

Regarding the heating device in the ninth publication, in any one of the seventh publication or the eighth publication, the second electromagnetic wave shield may include a second choke structure for suppressing the The penetration of electromagnetic waves irradiated by the irradiation unit.

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

Regarding the heating device in the tenth publication, in any one of the first to ninth publications, the irradiation unit may be configured to irradiate the heating chamber with electromagnetic waves having a frequency in the 2.45 GHz band or the 915 MHz band.

According to this configuration, the heating device can be realized by utilizing electromagnetic waves in an available frequency band.

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

According to this configuration, it is possible to provide a dryer that can more accurately detect the generation of sparks in the heating chamber.

Industrial Availability

As described above, the scope of application of the present disclosure is not limited to the drum-type washing-drying machine or the drum-type drying machine described above. For example, it can also be applied to a hanging drying method other than the drum type, a vertical washing-drying machine of a pulsator type, a vertical drying machine, and the like. Moreover, as long as it is a heating apparatus which heats using an electromagnetic wave, it can apply also when the object to be heated is an object other than clothing.

Description of reference numerals

1: housing; 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: drum Opening; 4: Shock Absorber; 5: Door Body; 6: Drive Motor; 7: Circulation Air Path; 8: Air Outlet; 9: Discharge Port; 10: Drain Valve; 11: Drain Pipe; 12: Water Supply Valve; 13: water supply pipe; 16: blower fan; 17: heater; 18: inflow temperature detection part; 19: opening part; 20: control device; 21: dehumidification part; 22: lint filter; 23: water seal 30: microwave heating device; 31: microwave irradiation part (irradiation part); 32: microwave irradiation port; 33: reflection part; 34: waveguide; 36: microwave receiving part (receiving part); 37: second electromagnetic wave shield body; 38: first choke portion (first choke structure); 39: second choke portion (second choke structure); 40: microwave control device; 41: spark detection portion (detection portion); 42: Output adjustment part; 60: drum-type washing and drying machine (dryer).

Claims (11)

1. A heating device is provided with:

a heating chamber for accommodating a heating object;

an irradiation unit that irradiates electromagnetic waves into the heating chamber;

a first electromagnetic wave shield for suppressing electromagnetic waves leaking from the heating chamber;

a receiving unit that receives an electromagnetic wave; and

a detection section that detects an electromagnetic wave generated by a spark in the heating chamber due to irradiation of the electromagnetic wave among the electromagnetic waves received by the reception section,

wherein the detection part detects the electromagnetic wave amplified in the space of the first electromagnetic wave shield.

2. The heating device according to claim 1,

wherein Lmax is a maximum linear length among an x-axis length, a y-axis length, and a z-axis length of a space constituting the first electromagnetic wave shield,

the detection part detects electromagnetic waves with the wavelength lambda of less than or equal to (lambda/2) and Lmax.

3. The heating device according to claim 1 or 2,

the detection unit detects an electromagnetic wave having a frequency of 5GHz or less among electromagnetic waves generated by a spark generated in the heating chamber.

4. The heating device according to any one of claims 1 to 3,

the receiving unit is provided outside the first electromagnetic wave shield and receives electromagnetic waves leaked from the first electromagnetic wave shield.

5. The heating device according to any one of claims 1 to 4,

the first electromagnetic wave shield 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.

6. The heating device according to any one of claims 1 to 5,

the first electromagnetic wave shield includes a first choke structure for suppressing leakage of electromagnetic waves from the heating chamber.

7. The heating device according to any one of claims 1 to 3,

a second electromagnetic wave shield for suppressing the intrusion of the electromagnetic wave irradiated from the irradiation unit,

the receiving unit is provided inside the second electromagnetic wave shield and receives the electromagnetic wave that has entered the second electromagnetic wave shield.

8. The heating device according to claim 7,

the second electromagnetic wave shield is disposed in a space of the first electromagnetic wave shield.

9. The heating device according to claim 7 or 8,

the second electromagnetic wave shield includes a second choke structure for suppressing intrusion of the electromagnetic wave radiated from the radiation unit.

10. The heating device according to any one of claims 1 to 9,

the irradiation unit irradiates an electromagnetic wave having a frequency of 2.45GHz band or 915MHz band into the heating chamber.

11. A dryer provided with the heating device according to any one of claims 1 to 10.

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