WO2022137625A1

WO2022137625A1 - Dryer

Info

Publication number: WO2022137625A1
Application number: PCT/JP2021/028267
Authority: WO
Inventors: 誠西村; 大輔鈴木
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2020-12-22
Filing date: 2021-07-30
Publication date: 2022-06-30
Also published as: CN116324075A; JPWO2022137625A1

Abstract

This drum-type dryer is provided with: a housing; a microwave emitting unit which is provided rotatably inside the housing, and which emits microwaves toward an object being dried, inside a drum that accommodates the object being dried; and a shielding unit for suppressing leakage of microwaves from the housing to the outside. The shielding unit is configured to include, at least, a first choke portion (25) for suppressing leakage of microwaves from a gap between a rotating body (3d), which is a portion of the drum, and a fixed portion (26a), which is a portion of the housing. The first choke portion (25), in which the rotating body (3d) is sandwiched by the fixed portion (26a), includes a first choke groove (40) and a second choke groove (41) provided respectively in a first gap (38) and a second gap (39) formed by the rotating body (3d) and the fixed portion (26a).

Description

Dryer

This disclosure relates to a dryer that dries an object to be dried.

As a method for speeding up the drying performance of a clothes dryer or a washer / dryer, there is a method of using microwaves as a heat source for heating the moisture of clothes (see, for example, Patent Document 1). In the washing machine with a high-frequency electromagnetic wave heating type dryer disclosed in Patent Document 1, a metal surface treatment is applied to the inner surface of the body portion, the lower opening portion, and the upper opening portion to suppress leakage of the high-frequency electromagnetic wave. Further, in the high frequency electromagnetic wave heating type dryer, drying parts are provided in the lower opening, and the inner surface of the water storage tank is treated with a metal surface to improve the heating efficiency. In addition, the washing machine with a high-frequency electromagnetic wave heating type dryer blows air using the air passage to improve the drying efficiency, cools the air containing moisture in the water tank, condenses it, and discharges the dry air. It is a thing.

Japanese Unexamined Patent Publication No. 2001-293281

In this way, the conventional dryer (for example, a drum type dryer) dries electromagnetic waves (microwaves) while rotating the drum, which is a tank containing the object to be dried, in order to improve the drying efficiency during the drying operation. Irradiate the object.

Therefore, in such a conventional dryer, it is necessary to suppress the leakage of electromagnetic waves from the drum to the outside when the drum rotates. For example, in the washing machine with a high-frequency electromagnetic wave heating type dryer in Patent Document 1, leakage of electromagnetic waves is suppressed by applying a metal surface treatment to the inner surfaces of the body portion, the lower opening portion, and the upper opening portion.

The present disclosure provides a dryer that suppresses leakage of electromagnetic waves when drying an object to be dried by irradiating it with electromagnetic waves by a method different from that of conventional dryers.

The dryer in the present disclosure includes a housing, a microwave irradiation unit that is rotatably provided inside the housing and irradiates microwaves on the drying object in a drum that houses the drying object, and an external part from the housing. It is provided with a shield portion for suppressing the leakage of microwaves to. The shield portion is configured to include at least a gap shield portion for suppressing leakage of microwaves from a gap between a rotating body that is a part of the drum and a fixed portion that is a part of the housing. The gap shield portion includes a microwave shield having a rotating body sandwiched between fixed portions and provided in the gaps on both sides of the rotating body and the fixed portion.

Further, the dryer in the present disclosure includes a housing, a microwave irradiation unit rotatably provided inside the housing, and a microwave irradiation unit that irradiates the drying target in a drum for accommodating the drying target with microwaves, and the housing. It is provided with a shield portion for suppressing leakage of microwaves from the outside to the outside. The shield portion is configured to include at least a gap shield portion for suppressing leakage of microwaves from a gap between a rotating body that is a part of the drum and a fixed portion that is a part of the housing. The gap shield portion includes a microwave shield in which the fixed portion is sandwiched between the rotating bodies and provided in the gaps on both sides of the rotating body and the fixed portion.

The dryer of the present disclosure can suppress leakage of electromagnetic waves when drying an object to be dried by irradiating it with electromagnetic waves in a method different from that of a conventional dryer.

FIG. 1 is a schematic vertical sectional view showing the configuration of the drum type dryer according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing the configuration of the drum type dryer according to the first embodiment. FIG. 3 is a schematic vertical sectional view showing the configuration of the first choke portion according to the first embodiment. FIG. 4 is a schematic vertical sectional view showing the configuration of the drum type dryer according to the second embodiment. FIG. 5 is a schematic vertical sectional view showing the configuration of the first choke portion according to the second embodiment. FIG. 6 is a schematic vertical sectional view showing the configuration of the drum type dryer according to the third embodiment. FIG. 7 is a schematic vertical sectional view showing the configuration of the first choke portion according to the third embodiment. FIG. 8 is a schematic vertical sectional view showing the configuration of the first choke portion according to another embodiment.

As described above, the gap shield portion of the dryer in the present disclosure includes the microwave shield provided in the gaps on both sides of the rotating body and the fixed portion, each of which sandwiches the rotating body by the fixing portion. Therefore, the dryer of the present disclosure can suppress the leakage of microwaves to the outside through the gap between the rotating body which is a part of the drum and the fixed portion which is a part of the housing. That is, the dryer of the present disclosure can suppress leakage of electromagnetic waves when drying an object to be dried by irradiating it with electromagnetic waves by a method different from that of a conventional dryer.

As described above, the gap shield portion of the dryer of the present disclosure includes a microwave shield in which the fixed portion is sandwiched between the rotating bodies and provided in the gaps on both sides composed of the rotating body and the fixed portion. Therefore, the dryer of the present disclosure can suppress the leakage of microwaves to the outside through the gap between the rotating body which is a part of the drum and the fixed portion which is a part of the housing. That is, the dryer of the present disclosure can suppress leakage of electromagnetic waves when drying an object to be dried by irradiating it with electromagnetic waves by a method different from that of a conventional dryer.

Further, in the dryer in the present disclosure, the gap shield portion may further include a seal portion that seals the gap between the rotating body and the fixed portion. In the gap shield portion, the seal portion is provided on the other side of the microwave shield provided in one of the gaps on both sides composed of the rotating body and the fixed portion and the gap on both sides composed of the rotating body and the fixed portion. It may be placed between the microwave shield and the shield.

Further, in the dryer in the present disclosure, the gap shield portion may further include a seal portion that seals the gap between the rotating body and the fixed portion. The seal portion may be arranged on the side of the gap shield portion that leads to the inside of the rotating body with respect to at least one of the microwave shields provided in the gaps on both sides of the rotating body and the fixed portion.

Further, in the dryer of the present disclosure, in the gap shield portion, the distance between the microwave shields provided in the gaps on both sides composed of the rotating body and the fixed portion is the wavelength of the microwave emitted from the microwave irradiation portion. It may be 1/4 or more.

(Knowledge, etc. that became the basis of this disclosure)
Conventionally, in order to improve the drying efficiency during the drying operation, there is known a dryer that irradiates an object to be dried with electromagnetic waves (microwaves) while rotating a drum which is a tank containing the object to be dried.

In a dryer that uses electromagnetic waves for such drying operation, an electromagnetic wave shield that suppresses leakage of electromagnetic waves from the drum when the drum rotates is required. For example, the washing machine with a high-frequency electromagnetic wave heating type dryer of Patent Document 1 is provided with a metal surface treatment on the inner surfaces of the upper opening, the body, and the lower opening as an electromagnetic wave shield.

The drum, which is a rotating body, is rotationally supported by providing a predetermined gap with respect to the fixed portion of the dryer housing, and does not come into contact with the fixed portion during rotation. Therefore, if there is no electromagnetic wave shield, the electromagnetic wave leaks out of the drum through the gap between the drum and the fixed portion.

From the viewpoint of durability, it is desirable that the electromagnetic wave shield has a non-contact structure in which the drum, which is a rotating body, and the fixed portion do not come into contact with each other. As this non-contact structure, for example, a groove for reflecting the electromagnetic wave is provided in the middle of the gap (leakage waveguide) where the electromagnetic wave leaks, and the leaked electromagnetic wave is combined with the reflected wave of the opposite phase generated in the groove to leak to the outside. It is conceivable to apply an electromagnetic wave shield with a so-called choke structure that suppresses it.

When applying the choke structure, the gap where electromagnetic waves leak may change due to the rotation of the drum, which may affect the performance of the electromagnetic wave shield. In addition, in order to prevent contact between the drum and the fixed part, the gap where electromagnetic waves leak is generally compared to the gap in other parts (for example, non-rotating parts such as doors) in consideration of rotational vibration and dimensional variation of the drum. Widely set. However, if the gap through which the electromagnetic wave leaks is widened, the effect of the electromagnetic wave shield is reduced. In order to narrow the gap where electromagnetic waves leak, the drum should be rotated stably, but for that purpose, high accuracy is required for the rotation support configuration of the drum, and the dryer is large, expensive, and non-produced. It leads to sex.

The inventor discovered such a problem and came to construct the subject of the present disclosure in order to solve the problem.

Therefore, the present disclosure provides a dryer that suppresses leakage of electromagnetic waves when drying an object to be dried by irradiating it with electromagnetic waves by a method different from that of conventional dryers.

Hereinafter, embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters or duplicate explanations for substantially the same configuration may be omitted.

It should be noted that 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.

(Embodiment 1)
Hereinafter, the drum type dryer 60 according to the first embodiment as an example of the dryer in the present disclosure will be described with reference to FIGS. 1 and 2.

[1-1. Constitution]
FIG. 1 is a schematic vertical sectional view schematically showing the configuration of the drum type dryer 60 according to the first embodiment. FIG. 2 is a schematic cross-sectional view schematically showing the configuration of the drum type dryer 60 according to the first embodiment. The drum type dryer 60 of the present embodiment has a function of drying an object to be dried such as clothes. The left side of FIG. 1 is the front side of the drum type dryer 60. Further, in the following, as shown in FIG. 1, the vertical direction in the state where the drum type dryer 60 is installed may be described as the vertical direction. Although not shown, the drum type dryer 60 may be provided with an air circulation device for promoting drying.

The drum type dryer 60 has a function of irradiating a drying object in a drum with microwaves, which is a kind of electromagnetic wave, in order to improve the drying efficiency during the drying operation. First, the basic configuration and operation of the drum type dryer 60 will be described. After that, the details of the shield portion 10 according to the first embodiment for suppressing the leakage of the microwave from the housing 1 when irradiating the microwave with the drum type dryer 60 will be described.

As a part of the drum 3 in which an object to be dried such as clothes is housed, a rotating body 3d is rotatably provided inside the housing 1 of the drum type dryer 60. The drum 3 is formed in a bottomed cylindrical shape. The drum 3 is provided so that the rotating shaft 14 is horizontal. In another example, the drum 3 may be provided so that the rotating shaft 14 is inclined forward with respect to the horizontal, or the rotating shaft 14 may be provided so as to be vertical.

The drive motor 6 is attached below the drum 3 and rotates the belt 15 during the drying operation. As a result, the drum 3 rotates in the forward direction or the reverse direction around the rotation axis 14.

The opening 19 and the door body 5 that opens and closes the opening 19 are provided at positions facing the opening end of the drum 3 on the front surface of the housing 1. By opening the door body 5, the user can put the object to be dried in and out of the drum 3.

The drum 3 has a drum front portion 3a and a drum rear portion 3b. The drum front portion 3a has a drum opening 3c provided at a position facing the opening 19 of the housing 1. The drum rear portion 3b is provided behind the drum front portion 3a. The drum front portion 3a may be a top surface portion of the drum 3 formed in a bottomed cylindrical shape. In that 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 portion in front of the side surface portion in addition to the top surface portion of the cylinder. In that case, the drum rear portion 3b may be the rest behind the side surface portion of the cylinder and the bottom surface portion.

The drum rear portion 3b may include a part of the side surface side of the top surface portion in addition to the side surface portion and the bottom surface portion of the drum 3. In that case, the drum front portion 3a may be the remaining portion of the top surface portion of the cylinder on the drum opening 3c side. The front part 3a of the drum and the rear part 3b of the drum may be manufactured integrally, or may be manufactured separately, and the drum 3 may be formed by connecting them.

A tubular communication portion 26 is provided between the drum 3 and the door body 5. The communication portion 26 is a part of the housing 1, is fixed to the housing 1, and does not rotate together with the drum 3.

A microwave irradiation unit 30, a waveguide 34, and a microwave irradiation port 32 are provided in the communication unit 26. The microwave irradiation unit 30 constituting the heating unit for heating the object to be dried irradiates the microwave from the microwave irradiation port 32 into the drum 3 via the waveguide 34, and contains the microwave in the object to be dried in the drum 3. Heat the water to be made. By providing the microwave irradiation unit 30 and the waveguide 34 in the communication unit 26, it is possible to suppress the vibration of the microwave irradiation unit 30 and the waveguide 34 when the drum 3 is rotated. Thereby, the drum type dryer 60 can improve the stability and safety of microwave irradiation.

The microwave irradiation unit 30 may be a microwave oscillator such as a magnetron, and oscillates an electromagnetic wave having a frequency in the 2.45 GHz band, for example. The electromagnetic wave oscillated by the microwave irradiation unit 30 is not limited to the 2.45 GHz band assigned as the ISM (Industry Science Medical) band, and may be an electromagnetic wave having a frequency such as the 915 MHz band similarly assigned.

Of the microwaves radiated into the drum 3, some of the microwaves that were not absorbed by the moisture contained in the object to be dried are reflected from the drum 3 to the microwave irradiation port 32 and the waveguide 34. It returns to the microwave irradiation unit 30 through. The drum type dryer 60 was irradiated from the microwave irradiation unit 30 by providing a reflection unit for reflecting a part or all of the reflected wave reflected from the drum 3 and traveling in the direction returning to the microwave irradiation unit 30. It may be incident on the drum 3 again together with the microwave. As a result, the drum type dryer 60 can reduce energy loss and shorten the drying operation time.

The control device 20 is provided in the housing 1. The control device 20 controls the drive motor 6, the microwave irradiation unit 30, and the like. Further, the control device 20 controls the drying operation according to an instruction input to the operation unit (not shown) by the user.

In the drum type dryer 60, a heater may be further provided as a heating unit for heating the object to be dried, although not shown. The microwave irradiation unit 30 and the heater may be energized to both or one of them at the same time. For example, when the clothes to be dried have metal such as buttons and fasteners attached to the clothes of the object to be dried and there is a high possibility that sparks are generated, the control device 20 may be controlled as follows. That is, the control device 20 may reduce or stop the output of the microwave emitted from the microwave irradiation unit 30 into the drum 3 and switch to drying with a heater.

The function of the control device 20 may be realized by a microcomputer and peripheral circuits as an example. The microcomputer and peripheral circuits may be in any form as long as they perform the control described later.

The control device 20 may be composed of an arithmetic processing unit and a storage unit for storing a control program. Examples of the arithmetic processing unit include an MPU (Micro Processing Unit) and a CPU (Central Processing Unit). A memory is exemplified as a storage unit. The control program recorded in the storage unit is executed by the arithmetic processing unit. Although the control program executed by the arithmetic processing unit is pre-recorded in the storage unit here, it may be recorded in a non-temporary recording medium such as a memory card and provided, or may be provided on a non-temporary recording medium such as the Internet. It may be provided through a telecommunication line.

Further, the control device 20 may be configured by hard logic. The control device 20 configured by hard logic is effective in improving the processing speed. Each component may be composed of one semiconductor chip or may be physically composed of a plurality of semiconductor chips. The control device 20 composed of a plurality of semiconductor chips can also realize each control described later with different semiconductor chips. Further, the control device 20 can also be realized by combining the above-mentioned microcomputer and peripheral circuits with the later-described hard logic.

Since the drum type dryer 60 of the present embodiment irradiates the inside of the drum 3 with microwaves, the intensity of the electromagnetic wave leaking to the outside of the drum type dryer 60 is equal to or less than the reference value determined in the area where the drum type dryer 60 is used. It needs to be configured to be. Therefore, the drum type dryer 60 of the present embodiment includes a shield portion 10 for suppressing leakage of microwaves (electromagnetic waves radiated from the microwave irradiation port 32) from the housing 1 to the outside.

As a standard for leaked electromagnetic waves, for example, the Japanese Industrial Standards "JIS" that regulates microwave ovens with a rated high frequency output of 2 kW or less that heat food with electromagnetic waves (microwaves) with a frequency of 2.45 GHz and microwave ovens with additional devices. There is "C9250". In 5.8 of the same standard, "When the power density of the leaked radio wave measured by the power density test of the leaked radio wave specified in 8.2.12 of the same standard is (1) when the door is closed, 1 mW / cm ² or less, (2) 5 mW / cm ² or less when the door is opened and fixed to the maximum position immediately before the oscillation stop device of the oscillation tube operates, (3) Main oscillation It must be 5 mW / cm ² or less with the oscillation stop device other than the stop device constrained. "

In addition, Appendix 8 of the Circulaire on the Interpretation of the "Ministerial Ordinance that Establishes Technical Standards for Electrical Appliances" that stipulates the technical standards specified by the Ordinance of the Ministry of Economy, Trade and Industry, which is stipulated in Article 8, Paragraph 1 of the Electrical Appliance and Material Safety Law. Section 2 (95) has almost the same contents. For washer-dryers, the same standards as for microwave ovens are considered to be appropriate.

In addition, the WHO (World Health Organization) recommends that the guidelines of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) prepared on the basis of scientific evidence by experts from each country be adopted as the exposure limit for human body protection. There is. This guideline stipulates that the exposure limit is 0.08 W / kg (1 mW / cm ² ).

The international standard "IEC62233" established by the International Electrotechnical Commission (IEC) and the Japanese Industrial Standards "JIS 1912" established based on it include the measurement of electromagnetic fields related to human exposure from household electrical equipment and similar equipment. The method is specified. In the measurement method specified in the standard, the electromagnetic field is measured as a ratio to the exposure limit value by weighting the signal of the sensor that detects the electromagnetic field. If the measured electromagnetic field as a ratio to the exposure limit value does not exceed the exposure limit value specified in the ICNIRP guideline, it is determined that the ICNIRP guideline is met. The shield portion 10 is configured to comply with these standards.

In the microwave oven, the storage chamber in which the object to be heated is housed is fixed, and large vibration does not occur during microwave irradiation. However, the drum type dryer 60 of the present embodiment has a high drying efficiency. For improvement, the drum 3 is rotated during the drying operation, resulting in vibration of the drum 3.

Of the configurations of the drum type dryer 60 according to the first embodiment shown in FIGS. 1 and 2, the members constituting the shield portion 10 are shown by thick solid lines. In the drum type dryer 60 of the first embodiment, the shield portion 10 includes a door body 5, a communication portion 26, a drum 3, a first choke portion 25, and a second choke portion 27. It is composed. The first choke portion 25 is an example of the gap shield portion in the present disclosure provided in the gap between the communication portion 26 and the drum 3. The second choke portion 27 is an example of a gap shield portion provided in the gap between the door body 5 and the communication portion 26. The shield portion 10 is an example of the shield portion in the present disclosure, and the shield portion in the present disclosure may include at least the gap shield portion in the present disclosure. That is, it is sufficient for the shield portion 10 to include the first choke portion 25, which is the gap shield portion according to the first embodiment. That is, the shield portion 10 does not include at least one or more of the door body 5, the communication portion 26, the drum 3, and the second choke portion 27, which are configured other than the first choke portion 25, or other than this. It may be modified to include the configuration. The shielded portion according to this deformation is also included in the shielded portion in the present disclosure.

The door body 5, the communication portion 26, and the drum 3 are configured to suppress leakage of microwaves (electromagnetic waves emitted from the microwave irradiation port 32). That is, the door body 5, the communication portion 26, and the drum 3 include a conductive material such as a metal capable of reflecting or absorbing microwaves. For example, the door body 5, the communication portion 26, or the drum 3 may be entirely formed of an electromagnetic wave shielding material such as a conductive material. Further, the door body 5, the communication portion 26, or the drum 3 may be formed of a material such as resin, and a plating layer of a conductive material may be provided on the inner surface or the outer surface. Further, the door body 5, the communication portion 26, or the drum 3 may be formed of a material such as resin, and a layer of an electromagnetic wave shielding material may be provided on the inner surface, the outer surface, or the inside. The drum 3 may be provided with holes through which water vapor and air can pass, but in this case, these holes are formed in a size such that microwaves do not leak.

The first choke portion 25 and the second choke portion 27 may have any choke structure known in a technical field such as a microwave oven. For example, the first choke portion 25 or the second choke portion 27 may be composed of a plurality of choke grooves. Since the plurality of choke grooves can suppress the leakage of microwaves in a plurality of stages, the shielding performance for preventing the leakage is improved. Further, the plurality of choke grooves may have the dimensions or shape of each choke changed according to the wavelength of the microwave emitted from the microwave irradiation unit 30, so as to generate a reflected wave having a phase opposite to the leaking electromagnetic wave. For example, it may be composed of a step choke. Further, the second choke portion 27 may be provided in the door body 5 or may be provided in the communication portion 26.

Further, the choke structure may be configured by filling at least a part of the space of the groove that generates the reflected wave with resin. Since the first choke portion 25 to which such a choke structure is applied can be made thinner and smaller, the first choke portion 25 to which this choke structure is applied is a communication portion 26 constituting the first choke portion 25. The dimension of the gap between the drum front portion 3a and the drum front portion 3a can be reduced. Therefore, the drum type dryer 60 provided with the first choke portion 25 to which this choke structure is applied can suppress the volume of the drum 3 from being reduced by the first choke portion 25, thus improving the convenience of the user. Can be made to.

The gap shield portion provided over the entire circumference in the gap between the door body 5 and the communication portion 26, or the gap shield portion provided over the entire circumference in the gap between the communication portion 26 and the drum 3 has a choke structure or the like. It is not limited to the reflective microwave shield. That is, an absorption type microwave shield such as a dielectric may be provided as these gap shield portions. In addition, a non-contact type microwave shield of any type may be provided as these gap shield portions.

Further, the first choke portion 25 may include a seal portion 29. The seal portion 29 is provided in the gap between the communication portion 26 and the drum front portion 3a, and seals between the communication portion 26 and the drum front portion 3a. As a result, the first choke portion 25 provided with the seal portion 29 can suppress the drying air in the drum 3 from flowing to the outside. The seal portion 29 does not have to completely seal the gap between the communication portion 26 and the drum front portion 3a. The seal portion 29 may have a sliding contact type configuration. The seal portion 29 may be made of any of felt, resin, rubber, and the like. Further, although not shown, the seal portion 29 may be provided in the second choke portion 27 as well.

FIG. 3 is an enlarged schematic vertical sectional view of the first choke portion 25, which is the gap shield portion according to the first embodiment. The first choke portion 25 sandwiches the cylindrical rotating body 3d, which is a part of the drum front portion 3a, from both sides by the fixing portion 26a, which is a part of the communication portion 26 (that is, a part of the housing 1). There is. As a result, the first choke portion 25 fixes the rotating drum 3 to the housing 1 of the drum type dryer 60. The first choke portion 25 is provided with a first gap 38 and a second gap 39 between the rotating body 3d and the fixed portion 26a, and the rotating body 3d does not come into contact with the fixed portion 26a when the drum 3 is rotated. The structure.

Further, the first choke portion 25 has a first choke groove 40, which is a first microwave shield, in the first gap 38, and a second choke groove 41, which is a second microwave shield, in the second gap 38. It is provided in the gap 39. That is, the first choke groove 40 which is the first microwave shield and the second choke groove 41 which is the second microwave shield are examples of the microwave shield in the present disclosure. By providing the first choke groove 40 and the second choke groove 41, the first choke portion 25 has an arrow in FIG. 3 from the gap between the rotating body 3d and the fixed portion 26a where the microwave irradiating the drum 3 is provided. It is possible to suppress leakage like this.

At this time, the distance between the first choke groove 40 and the second choke groove 41 (corresponding to the distance between the microwave shields in the present disclosure) is set to 1/4 wavelength or more of the microwave, and the first choke groove 40 and the second choke groove 41 It is desirable to further enhance the shielding performance of the second choke groove 41.

Further, the first choke portion 25 may have a bent structure, and the first choke groove 40 and the second choke groove 41 may be provided with the bent portion interposed therebetween. As a result, the length of the first choke portion 25 in the front-rear direction of the drum type dryer 60 can be shortened.

The first choke groove 40 may be composed of one groove or a plurality of grooves. The second choke groove 41 may be composed of one groove or may be composed of a plurality of grooves. Further, the microwave shield in the present disclosure may be realized by a configuration other than the choke groove.

The first choke portion 25 may include a seal portion 29 that seals a gap between the rotating body 3d and the fixing portion 26a. For example, the seal portion 29 is arranged between the first gap 38 and the second gap 39. In the present embodiment, as shown in FIG. 3, the seal portion 29 is arranged at the bent portion of the first choke portion 25, and the first gap 38 and the second gap 39 are made of a member such as felt or rubber. It may be held stably and sealed.

Further, the seal portion 29 may be arranged between the first choke groove 40 and the second choke groove 41 in the first choke portion 25. As a result, the microwave emitted from the microwave irradiation unit 30 is weakened by the first choke groove 40, and the seal portion 29 can be prevented from being damaged or deteriorated by being heated by the microwave. Further, since the second choke groove 41 is sealed with the drum 3 by the sealing portion 29, it is possible to suppress the accumulation of dust due to the inflow of air from the inside of the drum 3 and the generation of dew condensation due to the inflow of moisture. Therefore, the sealing portion 29 arranged in this way can suppress the deterioration of the shielding performance of the second choke groove 41.

[1-2. motion]
The operation and operation of the drum type dryer 60 configured as described above will be described below.

When the user opens the door body 5, accommodates the object to be dried in the drum 3, and instructs the start of the drying operation, the control device 20 starts the drying operation. The control device 20 drives the drive motor 6 to rotate the drum 3 and controls the microwave irradiation unit 30 to generate microwaves. The microwave is irradiated into the drum 3 through the waveguide 34 and the microwave irradiation port 32. As a result, the water contained in the object to be dried in the drum 3 is heated and evaporated.

When a predetermined time has elapsed from the start of the drying operation, the control device 20 stops driving the drive motor 6 and irradiating the microwave from the microwave irradiation unit 30, and ends the drying operation. The control device 20 may estimate the amount of water contained in the object to be dried, and may end the drying operation when the amount of water becomes less than a predetermined amount. When the drum type dryer 60 is provided with an air circulation device, the control device 20 may operate the air circulation device during the drying operation to promote drying.

In the drum type dryer 60, the amount and weight of the object to be dried vary, and the weight of the object to be dried changes between the initial stage and the end of the drying operation. Further, the drum 3 rotates and vibrates during the drying operation. Therefore, in the design of the drum type dryer 60, it is necessary to consider that the dimension of the gap between the rotating body 3d constituting the first choke portion 25 and the fixing portion 26a changes. Further, in the design of the drum type dryer 60, it is necessary to consider that the gap between the rotating body 3d and the fixed portion 26a has dimensional variation at the time of manufacture due to the structure of the drum type dryer 60. Further, in the design of the drum type dryer 60, it is necessary to consider that the frequency of the microwave varies depending on the operating condition of the drum type dryer 60.

Therefore, the first choke portion 25 sandwiches the rotating body 3d across the fixing portion 26a in order to suppress leakage of microwaves from the gap between the rotating body 3d and the fixing portion 26a to the outside. Then, in the first choke portion 25, the first choke groove 40 is provided in the first gap 38, and the second choke groove 41 is provided in the second gap 39. As a result, the first choke portion 25 can suppress the leakage of microwaves by the first choke groove 40 and the second choke groove 41.

Further, consider a case where the dimension of the gap between the rotating body 3d constituting the first choke portion 25 and the fixing portion 26a changes due to the rotational runout of the drum 3 during the drying operation of the drum type dryer 60. For example, in FIG. 3, when the gap G1 of the first gap 38 is widened, the gap G2 of the second gap 39 is narrowed. As a result, when the shielding performance by the first choke groove 40 becomes low, the shielding performance of the second choke groove 41 becomes high, and the first choke portion 25 leaks microwaves with respect to the rotational runout of the drum 3. Can be suppressed. Regarding the gap G1 of the first gap 38 and the gap G2 of the second gap 39, for example, when the gap G1 of the first gap 38 is widened, the gap of the second gap 39 is also with respect to the positional deviation that occurs during manufacturing. By narrowing G2, the first choke portion 25 can suppress the leakage of microwaves.

[1-3. Effect, etc.]
As described above, the drum type dryer 60 according to the first embodiment, which is an example of the dryer in the present disclosure, includes a housing 1, a microwave irradiation unit 30, and a shield unit 10. The microwave irradiation unit 30 is rotatably provided inside the housing 1 and irradiates the dried object in the drum 3 containing the dried object with microwaves. The shield portion 10 is for suppressing leakage of microwaves from the housing 1 to the outside. The shield portion 10 relates to at least the first embodiment for suppressing leakage of microwaves from a gap between a rotating body 3d which is a part of a drum 3 and a fixing portion 26a which is a part of a housing 1. It is configured to include a first choke portion 25 which is a gap shield portion. The first choke portion 25 has a choke groove, which is an example of the microwave shield in the present disclosure, in which the rotating body 3d is sandwiched between the fixing portions 26a and provided in the gaps on both sides formed by the rotating body 3d and the fixing portion 26a. include. That is, the first choke groove 40 is provided in the first gap 38, and the second choke groove 41 is provided in the second gap 39.

With this configuration, the first choke portion 25 leaks from the gap between the rotating body 3d and the fixed portion 26a when irradiating the dried object with microwaves while rotating the drum 3 containing the dried object. Microwaves can be suppressed.

That is, the first choke portion 25 is configured to narrow the gap of the second gap 39 when the gap of the first gap 38 widens, so that the influence of the change in the gap on the shielding performance can be suppressed. As a result, the drum type dryer 60 leaks microwaves even when the gaps between the first gap 38 and the second gap 39 change due to dimensional variations during manufacturing and rotational vibration of the drum 3 during the drying operation. Can be suppressed.

Further, the first choke portion 25 of the drum type dryer 60 according to the first embodiment may include a seal portion 29 that seals a gap between the rotating body 3d and the fixing portion 26a. The seal portion 29 may be arranged between the first choke groove 40 and the second choke groove 41 in the first choke portion 25. The first choke groove 40 is an example of the microwave shield in the present disclosure provided in the first gap 38 composed of the rotating body 3d and the fixing portion 26a. The second choke groove 41 is an example of the microwave shield in the present disclosure provided in the second gap 39 composed of the rotating body 3d and the fixing portion 26a.

With this configuration, the seal portion 29 can suppress the drying air in the drum 3 from flowing to the outside. Further, the microwave emitted from the microwave irradiation unit 30 is weakened by the first choke groove 40 and the second choke groove 41, and the seal portion 29 is prevented from being damaged or deteriorated by being heated by the microwave. can. Further, since the second choke groove 41 is sealed with the drum 3 by the sealing portion 29, the accumulation of dust due to the inflow of air from the inside of the drum 3 and the generation of dew condensation due to the inflow of moisture are suppressed, and the shielding performance is deteriorated. It can be suppressed.

Further, in the drum type dryer 60 according to the first embodiment, in the first choke portion 25, the distance between the first choke groove 40 and the second choke groove 41 is irradiated from the microwave irradiation unit 30. It may be 1/4 or more of the wavelength of the microwave. The first choke groove 40 is provided in the first gap 38, and the second choke groove 41 is provided in the second gap 39. The first gap 38 and the second gap 39 are gaps composed of the rotating body 3d and the fixing portion 26a.

Thereby, the first choke portion 25 can further enhance the shielding performance of the first choke groove 40 and the second choke groove 41.

(Embodiment 2)
Hereinafter, the drum type dryer 60A according to the second embodiment as an example of the dryer in the present disclosure will be described with reference to FIGS. 4 and 5. FIG. 4 is a schematic vertical sectional view schematically showing the configuration of the drum type dryer 60A according to the second embodiment. FIG. 5 is an enlarged schematic vertical sectional view of the first choke portion 25A, which is the gap shield portion according to the second embodiment. The drum type dryer 60A according to the second embodiment is different from the drum type dryer 60 according to the first embodiment in that the shield portion 10A is provided instead of the shield portion 10. Further, the shield portion 10A according to the second embodiment is different from the shield portion 10 according to the first embodiment in that the shield portion 10A includes the first choke portion 25A instead of the first choke portion 25. The same configurations and operations as those of the first embodiment are given the same numbers as those of the first embodiment, and detailed description thereof is omitted.

In the drum type dryer 60A of the second embodiment, the first choke portion 25A uses a fixed portion 26a, which is a part of the communication portion 26 (that is, a part of the housing 1), as a part of the drum front portion 3a. It is sandwiched from both sides by a cylindrical rotating body 3d. As a result, the first choke portion 25A fixes the rotating drum 3 to the housing 1 of the drum type dryer 60A. The first choke portion 25A is provided with a first gap 38 and a second gap 39 between the rotating body 3d and the fixed portion 26a, and the rotating body 3d does not come into contact with the fixed portion 26a when the drum 3 is rotated. The structure.

Further, in the first choke portion 25A, similarly to the first choke portion 25 according to the first embodiment, the first choke groove 40 is set in the first gap 38 and the second choke groove 41 is set in the second choke groove 41. It is provided in the gap 39. As described above, the first choke groove 40 and the second choke groove 41 are examples of the microwave shield in the present disclosure. By providing the first choke groove 40 and the second choke groove 41, the first choke portion 25A has the arrow in FIG. 5 from the gap between the rotating body 3d and the fixed portion 26a where the microwave irradiating the drum 3 is provided. It suppresses leakage like.

At this time, the distance between the first choke groove 40 and the second choke groove 41 (corresponding to the distance between the microwave shields in the present disclosure) is set to 1/4 wavelength or more of the microwave, and the first choke groove 40 and the second choke groove 41 It is desirable to further enhance the shielding performance of the second choke groove 41. Further, the first choke portion 25A may have a bent structure, and the first choke groove 40 and the second choke groove 41 may be provided with the bent portion interposed therebetween. As a result, the length of the first choke portion 25A in the front-rear direction of the drum type dryer 60A can be shortened.

Further, the first choke portion 25A may include a seal portion 29 that seals a gap between the rotating body 3d and the fixing portion 26a, similarly to the first choke portion 25 according to the first embodiment. .. For example, the seal portion 29 is arranged between the first gap 38 and the second gap 39. In the present embodiment, as shown in FIG. 5, the seal portion 29 is arranged at the bent portion of the first choke portion 25A, and the first gap 38 and the second gap 39 are made of a member such as felt or rubber. It may be held stably and sealed.

Further, the seal portion 29 may be arranged between the first choke groove 40 and the second choke groove 41 in the first choke portion 25A. As a result, the microwave emitted from the microwave irradiation unit 30 is weakened by the first choke groove 40, and the seal portion 29 can be prevented from being damaged or deteriorated by being heated by the microwave.

Further, since the second choke groove 41 is sealed with the drum 3 by the sealing portion 29, it is possible to suppress the accumulation of dust due to the inflow of air from the inside of the drum 3 and the generation of dew condensation due to the inflow of moisture. Therefore, the sealing portion 29 arranged in this way can suppress the deterioration of the shielding performance of the second choke groove 41.

As described above, the drum type dryer 60A according to the second embodiment, which is an example of the dryer in the present disclosure, includes a housing 1, a microwave irradiation unit 30, and a shield unit 10A. The microwave irradiation unit 30 is rotatably provided inside the housing 1 and irradiates the dried object in the drum 3 containing the dried object with microwaves. The shield portion 10A is for suppressing leakage of microwaves from the housing 1 to the outside. The shield portion 10A relates to at least the second embodiment for suppressing leakage of microwaves from a gap between the rotating body 3d which is a part of the drum 3 and the fixing portion 26a which is a part of the housing 1. It is configured to include a first choke portion 25A which is a gap shield portion. The first choke portion 25A has a choke groove, which is an example of the microwave shield in the present disclosure, in which the fixed portion 26a is sandwiched by the rotating body 3d and provided in the gaps on both sides formed by the rotating body 3d and the fixed portion 26a. include. That is, the first choke groove 40 is provided in the first gap 38, and the second choke groove 41 is provided in the second gap 39.

With this configuration, the first choke portion 25A leaks from the gap between the rotating body 3d and the fixed portion 26a when irradiating the dried object with microwaves while rotating the drum 3 containing the dried object. Microwaves can be suppressed.

(Embodiment 3)
Hereinafter, the drum type dryer 60B according to the third embodiment as an example of the dryer in the present disclosure will be described with reference to FIGS. 6 and 7. FIG. 6 is a schematic vertical sectional view schematically showing the configuration of the drum type dryer 60B according to the third embodiment. FIG. 7 is an enlarged schematic vertical sectional view of the first choke portion 25B, which is the gap shield portion according to the third embodiment. The drum type dryer 60B according to the third embodiment is different from the drum type dryer 60A according to the second embodiment in that the shield portion 10B is provided instead of the shield portion 10A. Further, the shield portion 10B according to the third embodiment is different from the shield portion 10A according to the second embodiment in that the shield portion 10B includes the first choke portion 25B instead of the first choke portion 25A. The same configurations and operations as those of the first and second embodiments are assigned the same numbers as those of the first and second embodiments, and detailed description thereof will be omitted.

The first choke portion 25B of the drum type dryer 60B of the third embodiment has a first gap 38 between the rotating body 3d and the fixed portion 26a, similarly to the first choke portion 25A of the second embodiment. And a second gap 39 is provided. Further, in the first choke portion 25B, the first choke groove 40 is in the first gap 38 and the second choke groove 41 is in the second gap, as in the first choke portion 25A of the second embodiment. It is provided in 39. The first choke groove 40 and the second choke groove 41 are examples of the microwave shield in the present disclosure.

The drum type dryer 60B of the third embodiment includes a seal portion 29 that seals a gap between the rotating body 3d and the fixed portion 26a, and the seal portion 29 is arranged as follows. That is, in the first choke portion 25B, the seal portion 29 is located in the gap on the side of the first choke groove 40 and the second choke groove 41 that leads to the drum 3, that is, on the side that leads to the inside of the rotating body 3d. Be placed. In the present embodiment, as shown in FIG. 7, the seal portion 29 is arranged at the bent portion of the first choke portion 25B, and the rotating body 3d and the fixing portion 26a are stably held by a member such as felt or rubber. And may be sealed.

As described above, in the drum type dryer 60B according to the third embodiment, which is an example of the dryer in the present disclosure, the seal portion 29 of the first choke portion 25B is arranged as follows. That is, the seal portion 29 is arranged on the side of the first choke portion 25B that leads to the inside of the rotating body 3d with respect to the first choke groove 40 and the second choke groove 41. The first choke groove 40 is an example of the microwave shield in the present disclosure provided in the first gap 38 composed of the rotating body 3d and the fixing portion 26a. The second choke groove 41 is an example of the microwave shield in the present disclosure provided in the second gap 39 composed of the rotating body 3d and the fixing portion 26a.

With this configuration, the seal portion 29 can suppress the drying air in the drum 3 from flowing to the outside. Further, since the first choke groove 40 and the second choke groove 41 are sealed with the drum 3 by the sealing portion 29, dust accumulation due to air inflow from the inside of the drum 3 and dew condensation due to moisture inflow occur. Can be suppressed. Therefore, the seal portion 29 can suppress the deterioration of the shielding performance of the first choke groove 40 and the second choke groove 41.

(Other embodiments)
As described above, Embodiments 1 to 3 have been described as examples of the techniques in the present disclosure. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. have been made. Further, it is also possible to combine the components described in the above-described first to third embodiments to form a new embodiment.

Therefore, the other embodiments will be illustrated below with reference to FIG.

FIG. 8 is an enlarged schematic vertical sectional view of a first choke portion 25C, which is a gap shield portion according to another embodiment. Hereinafter, other embodiments will be described with reference to FIG. The shield portion of the drum type dryer according to the other embodiment is different from the shield portion 10 according to the first embodiment in that the shield portion 25C includes the first choke portion 25 instead of the first choke portion 25. The same configurations and operations as those of the first to third embodiments are assigned the same numbers as those of the first to third embodiments, and detailed description thereof is omitted.

The first choke portion 25C of another embodiment is provided with a first choke groove 40 and a second choke groove 41, which are microwave shields similar to those of the first embodiment, in the second gap 39. It is different from the choke portion 25 according to the first embodiment. Further, the seal portion 29 is arranged in the first choke portion 25C in a gap on the side leading to the drum 3 with respect to the first choke groove 40 and the second choke groove 41. That is, the seal portion 29 is arranged on the side of the first gap 38 leading to the inside of the rotating body 3d. As shown in FIG. 8, the seal portion 29 may be arranged at the bent portion of the first choke portion 25C. As a result, the sealing portion 29 can stably hold and seal the first gap 38 and the second gap 39.

Although not shown, the first choke groove 40 and the second choke groove 41 may be arranged in the first gap 38, contrary to FIG. Further, similarly to FIG. 8, the seal portion 29 is arranged between the first gap 38 and the second gap 39 in the first choke portion 25C. As shown in FIG. 8, the seal portion 29 may be arranged at the bent portion of the first choke portion 25C. With this configuration, the microwave emitted from the microwave irradiation unit 30 is weakened by the first choke groove 40 and the second choke groove 41, and the seal portion 29 is heated by the microwave to be damaged or deteriorated. Can be suppressed.

As described above, as an example of the dryer in the present disclosure, the

drum type dryers

60, 60A and 60B according to the first to third embodiments and the drum type dryer according to another embodiment have been described. The dryer in the present disclosure may be a dryer other than the drum type, a washer / dryer, or the like. The dryer in the present disclosure may be applied to, for example, a vertical washer / dryer. The object to be dried in the present disclosure may be other than clothing.

Since the above-described embodiment exemplifies the technique in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or the equivalent thereof.

Further, any combination of the components described in the above embodiments, and the conversion of the expressions of the present disclosure between methods, devices, systems, recording media, computer programs, etc. are also effective as aspects of the present disclosure. be.

The dryer of the present disclosure is applicable to, for example, a dryer for drying an object to be dried such as clothes (for example, a drum type dryer, a vertical type dryer, etc.). The dryer of the present disclosure may be applied to a washer / dryer, for example, a drum type washer / dryer or a vertical washer / dryer. Further, the dryer of the present disclosure can be applied to objects to be dried other than clothes.

1 Housing 3 Drum 3a Drum front 3b Drum rear 3c Drum opening 3d Rotating body 5 Door body 6 Drive motor 10 Shield part

10A Shield part

10B Shield part 14 Rotating shaft 15 Belt 19 Opening 20 Control device 25 First choke Part (gap shield part)
25A 1st choke part (gap shield part)
25B 1st choke part (gap shield part)
25C 1st choke part (gap shield part)
26 Communication part 26a Fixed part 27 Second choke part 29 Seal part 30 Microwave irradiation part 32 Microwave irradiation port 34 Waveguide 38 First gap 39 Second gap 40 First choke groove (microwave shield)
41 Second choke groove (microwave shield)
60 Drum type dryer 60A Drum type dryer 60B Drum type dryer G1 interval G2 interval

Claims

With the housing
A microwave irradiation unit that is rotatably provided inside the housing and irradiates the dried object with microwaves in a drum for accommodating the dried object.
A shield portion for suppressing leakage of the microwave from the housing to the outside is provided.
The shield portion includes at least a gap shield portion for suppressing leakage of the microwave from a gap between a rotating body that is a part of the drum and a fixed portion that is a part of the housing. Being done
The gap shield portion includes a microwave shield having the rotating body sandwiched between the fixing portions and provided in the gaps on both sides of the rotating body and the fixing portion.
Dryer.
With the housing
A microwave irradiation unit that is rotatably provided inside the housing and irradiates the dried object with microwaves in a drum for accommodating the dried object.
A shield portion for suppressing leakage of the microwave from the housing to the outside is provided.
The shield portion includes at least a gap shield portion for suppressing leakage of the microwave from a gap between a rotating body that is a part of the drum and a fixed portion that is a part of the housing. Being done
The gap shield portion includes a microwave shield having the fixed portion sandwiched between the rotating bodies and provided in the gaps on both sides of the rotating body and the fixed portion.
Dryer.
The gap shield portion further includes a seal portion that seals the gap between the rotating body and the fixing portion.
The seal portion is composed of the microwave shield provided in one of the gaps on both sides formed by the rotating body and the fixing portion, and the rotating body and the fixing portion in the gap shield portion. Arranged between the microwave shield provided on the other side of the gap on both sides,
The dryer according to claim 1 or 2.
The gap shield portion further includes a seal portion that seals the gap between the rotating body and the fixing portion.
The seal portion is a side of the gap shield portion that leads to the inside of the rotating body with respect to at least one of the microwave shields provided in the gaps on both sides of the rotating body and the fixing portion. Placed in,
The dryer according to claim 1 or 2.
In the gap shield portion, the distance between the microwave shields provided in the gaps on both sides composed of the rotating body and the fixed portion is 1/4 or more of the wavelength of the microwave emitted from the microwave irradiation portion. ,
The dryer according to any one of claims 1 to 4.