WO2024239790A1 - 洗干一体机 - Google Patents

洗干一体机 Download PDF

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Publication number
WO2024239790A1
WO2024239790A1 PCT/CN2024/083533 CN2024083533W WO2024239790A1 WO 2024239790 A1 WO2024239790 A1 WO 2024239790A1 CN 2024083533 W CN2024083533 W CN 2024083533W WO 2024239790 A1 WO2024239790 A1 WO 2024239790A1
Authority
WO
WIPO (PCT)
Prior art keywords
head
resonance frequency
helmholtz resonator
blower fan
air path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2024/083533
Other languages
English (en)
French (fr)
Inventor
金田隆二
前田一成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Washing Machine Co Ltd
Haier Smart Home Co Ltd
Aqua Co Ltd
Original Assignee
Qingdao Haier Washing Machine Co Ltd
Haier Smart Home Co Ltd
Aqua Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Washing Machine Co Ltd, Haier Smart Home Co Ltd, Aqua Co Ltd filed Critical Qingdao Haier Washing Machine Co Ltd
Publication of WO2024239790A1 publication Critical patent/WO2024239790A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/50—Control of washer-dryers characterised by the purpose or target of the control
    • D06F33/76—Preventing or reducing imbalance or noise
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/52—Preventing or reducing noise

Definitions

  • the invention relates to a washing and drying machine.
  • the drying process tends to take a long time, and the requirement for noise reduction during the drying process is high.
  • the sound generated by the rotation of the blower fan when the wind flows through the air path becomes the main cause of the noise. Therefore, by reducing the noise generated in the air path, the noise during the drying process can be suppressed.
  • Patent Document 1 describes a washing machine in which a Helmholtz resonator is arranged inside an outer frame that elastically supports an outer tub or the like in order to reduce noise generated during a dehydration process.
  • the sound generated in the air path is composed of various frequency components, and there is a frequency in its spectrum where the sound pressure reaches a peak. Therefore, the Helmholtz resonator is constructed so that the resonance frequency (resonance frequency) coincides with the frequency at which the sound pressure reaches a peak. Through the resonance effect of the Helmholtz resonator, the frequency at which the sound pressure reaches a peak and the frequencies near it are canceled out, and the sound pressure of these frequencies is reduced, resulting in reduced noise.
  • the blower fan can rotate at multiple set speeds.
  • the speed of the blower fan is suppressed to a low level, and after the circulating wind is appropriately heated by the heat of the heater, the speed of the blower fan is increased so as to reduce the total power consumption during the drying process.
  • the speed of the blower fan changes, the flow velocity, flow rate, etc. of the wind in the air path will change, and accordingly, the spectrum of the sound generated in the air path may change, and the frequency at which the sound pressure reaches a peak may change.
  • the resonance frequency cannot be changed according to the change in the frequency at which the sound pressure reaches a peak, and therefore it is difficult to effectively reduce the noise during the drying process.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2-26598
  • the present invention is completed in view of the above-mentioned problems, and its purpose is to provide a washer-dryer that can utilize a Helmholtz resonator to effectively reduce the noise during the drying process.
  • the main scheme of the present invention relates to a washer-dryer, which comprises: an outer barrel, which is arranged in a housing; an inner barrel, which can be rotatably arranged in the outer barrel and contains laundry; a circulating air path, which is connected to the outer barrel; a blower fan, which circulates air between the outer barrel and the circulating air path; a heater, which heats the air flowing through the circulating air path; a noise reduction device, which is arranged near the circulating air path and is used to reduce the sound generated in the circulating air path; and a control unit.
  • the noise reduction device includes: a Helmholtz resonator; and a change mechanism, which is used to change the resonance frequency of the Helmholtz resonator.
  • the control unit controls the change mechanism so that the resonance frequency changes according to the rotation speed of the blower fan.
  • the Helmholtz resonator can be used to effectively reduce the noise from the circulating air duct during the drying process.
  • the Helmholtz resonator includes: a hollow cavity; and a cylindrical head extending from the cavity.
  • the opening of the head is connected to the inside of the circulating air duct.
  • the changing mechanism can adopt a structure that changes the opening area of the head, the length of the head, or the volume of the cavity.
  • the resonance frequency can be changed by changing the opening area of the head portion, the length of the head portion, or the volume of the cavity portion of the Helmholtz resonator.
  • the changing mechanism when the changing mechanism adopts a configuration of changing the opening area of the head, the length of the head, or the volume of the cavity, the changing mechanism may adopt a configuration including: a blocking member that blocks the opening of the head; and a moving device that moves the blocking member in such a way that the opening area changes.
  • the control unit may control the moving device.
  • the opening area of the head can be changed, and as a result, the resonance frequency of the Helmholtz resonator can be changed.
  • the changing mechanism when the changing mechanism adopts a configuration of changing the opening area of the head, the length of the head, or the volume of the cavity, the changing mechanism may adopt the following configuration, that is, including: the head can be extended and retracted in a manner of changing the length; and an extension device that allows the head to be extended and retracted.
  • the following configuration may be adopted: the control unit controls the extension device.
  • the length of the head portion can be changed by extending and retracting the head portion, and as a result, the resonance frequency of the Helmholtz resonator can be changed.
  • the changing mechanism when the changing mechanism adopts a configuration of changing the opening area of the head, the length of the head, or the volume of the cavity, the changing mechanism may adopt the following configuration, that is, including: the cavity can be extended and retracted in a manner of changing volume; and an extension device that makes the cavity extend and retract.
  • the following configuration may be adopted: the control unit controls the extension device.
  • the volume of the cavity portion can be changed by expanding or contracting the cavity portion, and as a result, the resonance frequency of the Helmholtz resonator can be changed.
  • the control unit makes the blower fan rotate at a second speed higher than the first speed after rotating at a first speed during the drying process, and the control unit controls the changing mechanism in the following manner: when the blower fan rotates at the first speed, the Helmholtz resonator has a first resonance frequency corresponding to the first speed, and when the blower fan rotates at the second speed, the Helmholtz resonator has a second resonance frequency corresponding to the second speed.
  • the first resonance frequency can be made consistent with (including substantially consistent with) the frequency at which the sound pressure in the spectrum of the sound generated in the circulating air path when the blower fan rotates at the first speed reaches a peak.
  • the second resonance frequency can be made consistent with the frequency at which the sound pressure in the spectrum of the sound generated in the circulating air path when the blower fan rotates at the second speed reaches a peak.
  • the frequencies at which the peak values are reached are consistent (including approximately consistent).
  • the noise from the circulating air duct at the first speed and the noise from the circulating air duct at the second speed can be reliably reduced.
  • a washer-dryer can be provided which can utilize a Helmholtz resonator to effectively reduce noise during a drying process.
  • Fig. 1 is a side cross-sectional view showing the structure of a washer-dryer according to an embodiment.
  • FIG. 2 (a) and (b) are side cross-sectional views of the noise reduction device according to the embodiment.
  • FIG. 3 (a) is a front view of the noise reduction device according to the embodiment, and (b) is a perspective view of the Helmholtz resonator according to the embodiment.
  • FIG. 4 (a) is a rear view of the modification mechanism of the embodiment, and (b) is a rear cross-sectional view of the holding member of the embodiment.
  • FIG. 5 is a block diagram showing the structure of the washer-dryer according to the embodiment.
  • FIG. 6 is a diagram schematically showing an example of a frequency spectrum of noise emitted from the circulation air duct according to the embodiment.
  • FIG. 7 is a flowchart showing a control operation of the control unit during the drying process according to the embodiment.
  • FIG. 8 (a) and (b) are side views of the noise reduction device according to Modification 1.
  • FIG. 8 (a) and (b) are side views of the noise reduction device according to Modification 1.
  • FIG. 9 is a front view of the noise reduction device according to Modification 1.
  • FIG. 9 is a front view of the noise reduction device according to Modification 1.
  • FIG. 10 (a) and (b) are side views of the noise reduction device of Modification Example 2, and (c) is a side view of Modification Example 2. Front view of the sound reduction device.
  • Reference Numerals 10 box body; 20: outer barrel; 23: drum (inner barrel); 110: circulating air path; 120: blower fan; 132: heater; 200: sound reduction device; 210: Helmholtz resonator; 211: cavity; 212: head; 212a: opening; 220: changing mechanism; 230: closing member; 240: moving device; 301: control unit; 400: sound reduction device; 410: Helmholtz resonator; 411: cavity; 412: head; 420: changing mechanism; 430: telescopic device; 500: sound reduction device; 510: Helmholtz resonator; 511: cavity; 512: head; 520: changing mechanism; 530: telescopic device.
  • FIG. 1 is a side cross-sectional view showing the structure of a washer-dryer 1 .
  • the washer-dryer 1 of this embodiment is a so-called drum-type washer-dryer.
  • the washer-dryer 1 includes a square housing 10.
  • a circular inlet 11 for inputting laundry is formed on the front surface of the housing 10.
  • the inlet 11 is covered by a door 12 that can be opened and closed.
  • An outer barrel 20 is arranged in the housing 10.
  • the outer barrel 20 is elastically supported by a plurality of shock absorbers 21 and springs 22.
  • a drum 23 for accommodating laundry is rotatably arranged in the outer barrel 20.
  • the drum 23 rotates around a horizontal axis.
  • the drum 23 has a circular opening 23a on its front surface.
  • the outer barrel 20 has a circular opening 20a in front of the opening 23a of the drum 23.
  • the laundry is taken out through the opening 23a and put into the drum 23.
  • the drum 23 is equivalent to the "inner barrel" of the present invention.
  • the outer tub 20 has a circular opening 20a in front of the opening 23a of the drum 23.
  • the peripheral edge of the opening 20a of the outer tub 20 and the peripheral edge of the inlet 11 of the box 10 are connected by an annular door packing 24 made of elastic material.
  • the peripheral surface of the closed door 12 contacts the door packing 24, and the inlet 11 and the door 12 are water-sealed.
  • a drive motor 30 is disposed at the rear of the outer tub 20 to generate torque for rotating the drum 23.
  • the drive motor 30 is, for example, an outer rotor type DC brushless motor.
  • the drive motor 30 rotates the drum 23 at a speed at which the centrifugal force applied to the laundry in the drum 23 is less than the gravity and the laundry tumbling during the washing process, the rinsing process, and the drying process.
  • the drive motor 30 rotates the drum 23 at a speed at which the centrifugal force applied to the laundry in the drum 23 is much greater than the gravity and the laundry adheres to the inner circumference of the drum 23 during the dehydration process.
  • a drain port 20b is formed at the bottom of the outer barrel 20.
  • a drain valve 41 for opening and closing the drain port 20b is provided at the drain port 20b.
  • the drain valve 41 includes, for example, a valve and a torque motor for opening and closing the valve.
  • the drain valve 41 is connected to a drain hose 42.
  • the drain valve 41 and the drain hose 42 constitute a drain portion 40 for draining water from the outer barrel 20.
  • a drain filter 43 for capturing foreign matter such as lint is arranged in the middle of the drain hose 42.
  • a water supply unit 50 is disposed at the upper portion of the housing 10.
  • the water supply unit 50 includes a water supply valve 51 and a water supply path 52.
  • One end of the water supply path 52 is connected to the water supply valve 51, and the other end is connected to a water inlet 20c provided on the back of the outer tub 20.
  • tap water from the faucet flows through the water supply path 52 and is supplied to the outer tub 20 from the water inlet 20c.
  • the water supply unit 50 may also include an automatic injection device for automatically injecting liquid detergent and liquid softener into the outer tub 20.
  • the automatic injection device includes, for example, a liquid agent box (tank) for storing liquid detergent and liquid softener and a pump for sending the liquid detergent and liquid softener in the liquid agent box to the water supply path 52.
  • the liquid detergent and liquid softener discharged into the water supply path 52 are sent to the outer tub 20 by the water flowing through the water supply path 52.
  • a drying device 100 for drying the laundry in the drum 23 is arranged at the upper portion of the housing 10.
  • the drying device 100 includes a circulation air duct 110, a blower fan 120, a cooler 131, and a heater 132.
  • the circulation air path 110 is connected to the outer tub 20 and includes an outlet duct 111, a fan casing 112 equipped with a blower fan 120, a housing 113 equipped with a cooler 131 and a heater 132, and an inlet duct 114.
  • the circulation air path 110 is arranged above the outer tub 20 in the housing 10.
  • One end of the outlet duct 111 is connected to an exhaust port 20d provided on the back of the outer tub 20, and the other end is connected to a suction port of the fan housing 112.
  • the exhaust port 20d may also be provided on the rear portion of the circumference of the outer tub 20.
  • the housing 113 has a box shape that is long in the front-to-back direction and is disposed above the outer tub 20 and the fan housing 112
  • the rear end of the housing 113 is connected to the outlet of the fan housing 112.
  • the introduction duct 114 extends from the front end of the housing 113 and is connected to the outlet 20e provided at the front upper part of the door liner 24.
  • the outlet 20e faces the inside of the drum 23.
  • the blower fan 120 is, for example, a centrifugal fan, and includes a fan 121 housed in a fan housing 112 and a fan motor 122 for rotating the fan 121.
  • the blower fan 120 circulates air (wind) between the outer tub 20 and the circulating air path 110.
  • the air discharged from the outer tub 20 through the exhaust port 20d flows through the circulating air path 110 in the order of the outlet duct 111, the fan housing 112, the outer shell 113, and the inlet duct 114, and is discharged from the outlet 20e into the outer tub 20, that is, the drum 23.
  • cooler 131 may be a water-cooled heat exchanger or the like
  • heater 132 may be a semiconductor heater or the like.
  • the drying device 100 includes a first temperature sensor 141 and a second temperature sensor 142.
  • the first temperature sensor 141 is disposed in the outlet duct 111, upstream of the blower fan 120 in the circulating air path 110, and detects the temperature of the air (wind) discharged from the outer tub 20 as the outlet temperature.
  • the second temperature sensor 142 is disposed in the inlet duct 114, downstream of the heater 132 in the circulating air path 110, and detects the temperature of the air (wind) introduced into the outer tub 20 after passing through the heater 132 as the inlet temperature.
  • a noise reduction device 200 for reducing the sound generated in the circulating air duct 110 is arranged near the circulating air duct 110 in the housing 10. During the drying process, when the wind generated by the rotation of the blower fan 120 flows through the circulating air duct 110, the sound generated by the flow of the wind is emitted as noise from the circulating air duct 110. The noise from the circulating air duct 110 becomes the main noise emitted from the washer-dryer 1 during the drying process.
  • the noise generated in the circulating air duct 110 varies depending on the flow of air in each part of the circulating air duct 110. Therefore, the part generating the largest noise in the circulation air duct 110 is determined by measuring the noise through a preliminary test or the like, and the noise reduction device 200 is arranged in the determined part.
  • a noise reduction device 200 is arranged near the inlet end 114a of the introduction duct 114 in the circulation air path 110.
  • the flow path cross-sectional area of the introduction duct 114 is smaller than the flow path cross-sectional area of the housing 113, and when wind flows into the introduction duct 114, the wind speed increases.
  • the circulation air path 110 is greatly bent downward, and the flow of wind is easily disturbed at the bent portion. Therefore, it is considered that loud noise is easily generated at the inlet end 114a of the introduction duct 114.
  • FIG. 2 (a) and (b) are side cross-sectional views of the noise reduction device 200.
  • FIG. 3 (a) is a front view of the noise reduction device 200
  • FIG. 3 (b) is a perspective view of the Helmholtz resonator 210.
  • FIG. 4 (a) is a rear view of the change mechanism 220
  • FIG. 4 (b) is a rear cross-sectional view of the retaining member 250.
  • FIG. 2 (a) shows the noise reduction device 200 in a state where the opening 212a of the head 212 of the Helmholtz resonator 210 is fully open
  • FIG. 2 (b) shows the noise reduction device 200 in a state where a portion of the opening 212a of the head 212 of the Helmholtz resonator 210 is closed by the closing member 230.
  • the noise reduction device 200 includes a Helmholtz resonator 210 that generates Helmholtz resonance and a changing mechanism 220 that changes the resonance frequency of the Helmholtz resonator 210 .
  • the Helmholtz resonator 210 includes a hollow cavity 211 and a head 212 extending from the cavity 211.
  • the cavity 211 has a square box shape, and the head 212 has a square cylinder shape.
  • the inside of the head 212 is connected to the inside of the cavity 211.
  • the resonance frequency f of the Helmholtz resonator 210 is determined by the volume (internal volume) V of the cavity portion 211, the length L of the head portion 212, and the opening area S of the head portion 212.
  • the resonance frequency f can be calculated using the following calculation formula using the volume V, length L, opening area S and sound speed C.
  • the changing mechanism 220 changes the resonance frequency f of the Helmholtz resonator 210 by changing the opening area S of the head 212. Therefore, the changing mechanism 220 includes: a closing member 230 that closes the opening 212a of the head 212; and a moving device 240 that moves the closing member 230 in such a way that the opening area S of the head 212 changes. move.
  • the closing member 230 is formed in a square flat plate shape and has a size larger than the opening 212 a of the head 212 .
  • the moving device 240 includes: a holding member 250 that slidably holds the blocking member 230; a moving motor 260 that serves as a power source for moving the blocking member 230; and a rack and pinion mechanism 270 that converts the rotational motion of the moving motor 260 into a linear motion and transmits it to the blocking member 230.
  • the holding member 250 has a square plate shape.
  • a square opening portion 251 is formed at the upper portion of the holding member 250.
  • the opening portion 251 has the same shape and size as the opening 212a of the head portion 212 of the Helmholtz resonator 210.
  • a sliding hole 252 is formed inside the holding member 250, extending downward from the opening portion 251 and penetrating the lower surface.
  • the sliding hole 252 has the same left-right and front-back dimensions as the closing member 230.
  • the upper and lower dimensions of the sliding hole 252 are smaller than the upper and lower dimensions of the closing member 230.
  • the closing member 230 is inserted into the sliding hole 252 so as to be slidable in the upper and lower directions.
  • a square frame-shaped front connection port 253 protruding forward is formed around the opening 251 on the front surface of the holding member 250.
  • a square frame-shaped rear connection port 254 protruding rearward is formed around the opening 251 on the rear surface of the holding member 250.
  • the holding member 250 is fixed to the rear of the introduction duct 114 of the circulation air path 110.
  • the front connection port 253 of the holding member 250 is connected to the connection port 114b of the introduction duct 114.
  • the head 212 of the Helmholtz resonator 210 is connected to the rear connection port 254 of the holding member 250.
  • the opening 212a of the head 212 is connected to the inside of the circulation air path 110 via the opening 251 of the holding member 250, and the inside of the Helmholtz resonator 210 is connected to the inside of the circulation air path 110.
  • the moving motor 260 is a stepping motor, and is disposed below the holding member 250.
  • a bracket 280 is mounted on the moving motor 260.
  • the moving motor 260 is fixed to the rear surface of the introduction duct 114 via the bracket 280.
  • the rack and pinion mechanism 270 is composed of a rack 271 and a pinion 272.
  • the rack 271 is fixed to the lower portion of the rear surface of the blocking member 230 so as to extend in the vertical direction, which is the moving direction of the blocking member 230.
  • the pinion 272 is fixed to the rotating shaft 261 of the moving motor 260 and meshes with the rack 271.
  • a position sensor such as a photosensor (not shown).
  • the blocking member 230 slides upward, that is, in a direction close to the opening 212a of the head 212. As a result, as shown in FIG. 2(b), a part of the opening 212a of the head 212 is blocked by the blocking member 230.
  • the opening area S of the head 212 changes according to the amount of blocking of the opening 212a by the blocking member 230.
  • the smaller the opening area S the smaller the resonance frequency f.
  • the opening area S of the head 212 can be determined by the amount of movement of the blocking member 230 from the reference position, that is, the rotation angle of the movement motor 260 from the reference position corresponding to the movement amount.
  • FIG. 5 is a block diagram showing the structure of the washer-dryer 1 .
  • the washer-dryer 1 also includes: a control unit 301, a storage unit 302, an operation unit 303, a display unit 304, a water level sensor 305, a first motor drive unit 306, a water supply drive unit 307, a drainage drive unit 308, a fan drive unit 309, a compressor drive unit 310 and a second motor drive unit 311.
  • the operation unit 303 includes: a power button for connecting and disconnecting the power supply; a mode selection button for selecting any operation mode from a plurality of operation modes such as washing operation and washing and drying operation; and a start button for starting the operation.
  • the operation unit 303 outputs an input signal corresponding to the operation button operated by the user to the control unit 301.
  • Display unit 304 includes a light-emitting element such as an LED or a display such as a liquid crystal panel, and displays a selected mode, the progress of a washing operation, and notifies abnormalities based on a control signal from control unit 301 .
  • a light-emitting element such as an LED or a display such as a liquid crystal panel
  • the water level sensor 305 detects the water level in the outer tub 20 and outputs a water level signal corresponding to the water level to the control unit 301 .
  • the first temperature sensor 141 and the second temperature sensor 142 output temperature signals corresponding to the detected outlet temperature and inlet temperature, respectively, to the control unit 301 .
  • the first motor driving unit 306 drives the driving motor 30 according to the control signal from the control unit 301.
  • the first motor driving unit 306 adjusts the driving power so that the driving motor 30 rotates at a set rotation speed.
  • the water supply driving unit 307 drives the water supply valve 51 according to the control signal from the control unit 301.
  • the drainage driving unit 308 drives the drainage valve 41 according to the control signal from the control unit 301.
  • the fan driving unit 309 drives the fan motor 122 of the blower fan 120 according to the control signal from the control unit 301.
  • the fan driving unit 309 adjusts the driving power so that the fan motor 122 rotates at a set rotation speed.
  • the compressor driver 310 drives the compressor 133 according to a control signal from the controller 301 to operate the cooler 131 and the heater 132.
  • the second motor driver 311 drives the moving motor 260 of the moving device 240 according to a control signal from the controller 301.
  • the storage unit 302 includes an EEPROM (Electrically Erasable Programmable Read Only Memory), a RAM (Random Access Memory), etc.
  • the storage unit 302 stores programs for executing various modes of operation.
  • the storage unit 302 stores various parameters and various control flags for executing these programs.
  • the control unit 301 includes a CPU (central processing unit) and the like, and controls the display unit 304, the first motor drive unit 306, the water supply drive unit 307, the drainage drive unit 308, the fan drive unit 309, the compressor drive unit 310, the second motor drive unit 311 and the like based on various signals from the operation unit 303, the water level sensor 305, the first temperature sensor 141, the second temperature sensor 142 and the like, and according to a program stored in the storage unit 302.
  • a CPU central processing unit
  • the washing and drying operation based on the user's operation of the operating unit 303, the washing and drying operation, washing operation and drying operation of various operation modes are performed under the control of the control unit 301.
  • the washing process, the intermediate dehydration process, the rinsing process, the final dehydration process and the drying process are performed in sequence.
  • the washing process is performed to the final dehydration process without the drying process.
  • the drying operation only the drying process is performed.
  • the rinsing process and the intermediate dehydration process may be performed more than twice.
  • water containing detergent is accumulated in the outer tub 20 to a washing water level corresponding to the load of the laundry contained in the drum 23, and the laundry immersed in the water is tumbled in the drum 23 by repeatedly rotating the drum 23 forward and reversely.
  • the water containing detergent penetrates into the laundry, and the dirt on the laundry is removed by the effect of the detergent and the mechanical force generated by the tumbling.
  • the driving motor 30 rotates unidirectionally at a high speed, and the drum 23 rotates unidirectionally at a speed at which the centrifugal force acting on the laundry in the drum 23 is much greater than the gravity.
  • the centrifugal force Through the action of the centrifugal force, the laundry is pressed against the peripheral wall of the drum 23 and dehydrated.
  • air i.e., wind
  • the blower fan 120 circulates between the outer tub 20 and the circulating air path 110 by the operation of the blower fan 120, and the wind introduced into the outer tub 20 is heated to become hot wind by the operation of the heater 132.
  • the drum 23 rotates forward and reversely, and the laundry tumbles in the drum 23.
  • the hot air stripped of moisture from the laundry returns from the exhaust port 20d to the circulation air path 110.
  • the hot air in the circulation air path 110 passes through the cooler 131 before being heated by the heater 132 and is dehumidified by the cooler 131.
  • the washer-dryer 1 of this embodiment includes the Helmholtz resonator 210 near the circulation air duct 110 and the noise reduction device 200 capable of changing the resonance frequency f of the Helmholtz resonator 210 .
  • FIG. 6 is a diagram schematically showing an example of a frequency spectrum of sound generated in circulation air duct 110 .
  • the sound generated in the circulating air duct 110 is composed of various frequency components, and in its spectrum, there is a frequency at which the sound pressure reaches a peak.
  • the resonance frequency f of the Helmholtz resonator 210 is made consistent with (including approximately consistent with) the frequency at which the sound pressure reaches a peak, the frequency and the frequencies near it are offset by the resonance effect, and the sound pressure of these frequencies is reduced. As a result, the noise from the circulating air duct 110 can be reduced.
  • the frequency at which the sound pressure reaches a peak is referred to as the "peak frequency”.
  • the rotation speed of the blower fan 120 is suppressed to be low, and after the circulating wind is appropriately heated by the heat of the heater 132, the rotation speed of the blower fan 120 is increased so as to reduce the total power consumption during the drying process.
  • the rotation speed of the blower fan 120 is initially set to a first rotation speed (for example, 3000 rpm), and after the wind becomes high temperature, the rotation speed of the blower fan 120 is set to a second rotation speed (for example, 5000 rpm) that is higher than the first rotation speed.
  • a first rotation speed for example, 3000 rpm
  • a second rotation speed for example, 5000 rpm
  • the rotation speed of blower fan 120 changes, the velocity and flow rate of the wind in circulation duct 110 change. Accordingly, the spectrum of the sound generated in circulation duct 110 may change, and the peak frequency may change.
  • a frequency measuring device is used to measure the frequency spectrum of each sound generated in the circulation air duct 110 when the blower fan 120 rotates at the first speed and the second speed, thereby specifying the peak frequency at the first speed and the peak frequency at the second speed.
  • the peak frequency of is determined as the resonance frequency f of the Helmholtz resonator 210 when the blower fan 120 rotates at the first speed, that is, the first resonance frequency corresponding to the first speed.
  • the peak frequency at the second speed is determined as the resonance frequency f when the blower fan 120 rotates at the second speed, that is, the second resonance frequency corresponding to the second speed.
  • the opening area S of the head 212 at which the resonance frequency f of the Helmholtz resonator 210 reaches the first resonance frequency is obtained by using the above-mentioned calculation formula of the resonance frequency f. Then, the rotation angle of the moving motor 260 from the reference position for closing the opening 212a of the head 212 by the closing member 230 so that the opening area S becomes the obtained opening area S is set to the first rotation angle corresponding to the first resonance frequency, that is, the first rotation speed. In the same way, the second rotation angle corresponding to the second resonance frequency, that is, the second rotation speed is set. These first rotation angle and second rotation angle are stored in the storage unit 302.
  • the first rotation angle or the second rotation angle is set to 0. In this case, the moving motor 260 does not rotate from the reference position.
  • FIG. 7 is a flowchart showing the control operation of the control unit 301 during the drying process.
  • the control unit 301 controls the change mechanism 220 (moving device 240) to set the resonance frequency f of the Helmholtz resonator 210 to the first resonance frequency (S1). That is, the control unit 301 rotates the moving motor 260 forward from the reference position by the first rotation angle. As a result, the blocking member 230 slides from the reference position to block a portion of the opening 212a of the head 212 in such a way that the opening area S becomes the opening area S corresponding to the first resonance frequency.
  • control unit 301 starts the blower fan 120 and rotates it at a first speed (S2).
  • control unit 301 operates the compressor 133 to operate the cooler 131 and the heater 132 (S3).
  • control unit 301 starts the drive motor 30 to rotate the drum 23 at a speed (for example, 45 rpm) at which the laundry in the drum 23 tumbles (S4).
  • the drum 23 may also change its rotation direction at a predetermined time interval.
  • the air i.e., wind
  • the air circulates between the circulating air path 110 and the outer tub 20 while being heated by the heater 132 by the rotation of the blower fan 120.
  • the heat transferred from the heater 132 to the circulating air is consumed by heating the outer tub 20, the drum 23, and the circulating air path 110. Therefore, the temperature of the circulating air itself is difficult to rise.
  • the outer tub 20, the drum 23, and the circulating air path 110 become hot, the temperature of the circulating air is increased. The degree gradually rises.
  • the loudest noise in the circulation air path 110 is generated at the inlet end 114a of the introduction duct 114.
  • the peak frequency of the generated noise coincides with the first resonance frequency of the Helmholtz resonator 210 disposed near the inlet end 114a. As a result, the peak frequency and the frequencies near the peak frequency are offset, and the noise is reduced.
  • the control unit 301 determines whether the circulating air is properly heated (S5). For example, the control unit 301 detects the temperature of the circulating air discharged from the outer barrel 20 through the first temperature sensor 141, and determines that the circulating air is properly heated when the temperature reaches a predetermined temperature. Alternatively, the control unit 301 determines that the circulating air is properly heated when a predetermined time has passed after the blower fan 120 and the heater 132 start working.
  • the control unit 301 determines that the circulating air is appropriately heated (S5: Yes)
  • the rotation speed of the blower fan 120 is increased to the second rotation speed (S6).
  • the air volume of the circulating air is increased.
  • a large amount of high-temperature circulating air contacts the laundry in the drum 23, making it easier to dry the laundry.
  • the control unit 301 controls the change mechanism 220 (moving device 240) to change the resonance frequency f of the Helmholtz resonator 210 to the second resonance frequency (S7). That is, the control unit 301 obtains the rotation angle of the difference between the second rotation angle and the first rotation angle, and rotates the moving motor 260 by the rotation angle of the difference. If the rotation angle of the difference is a positive value, the moving motor 260 rotates forward, and the blocking member 230 moves in the direction in which the blocking amount increases. If the rotation angle of the difference is a negative value, the moving motor 260 rotates reversely, and the blocking member 230 moves in the direction in which the blocking amount decreases. As a result, the blocking member 230 blocks a portion of the opening 212a of the head 212 in such a manner that the opening area S becomes the opening area S corresponding to the second resonance frequency.
  • the peak frequency of the noise generated in the inlet end 114a of the introduction duct 114 changes.
  • the changed peak frequency coincides with the changed second resonance frequency.
  • the peak frequency and the frequencies near it are offset, and the noise is reduced.
  • the control unit 301 determines whether the drying process can be terminated (S8). For example, the control unit 301 determines the drying rate of the clothes in the drum 23 based on the outlet temperature detected by the first temperature sensor 141 and the inlet temperature detected by the second temperature sensor 142, and determines that the drying process can be terminated when a predetermined drying rate (for example, 100%) is reached at which the clothes can be considered to be fully dried.
  • a predetermined drying rate for example, 100%
  • the outlet temperature detected by the first temperature sensor 141 that is, the temperature of the hot air discharged from the outer barrel 20
  • the temperature is approximately constant while the clothes in the drum 23 contain sufficient moisture and sufficient heat exchange is performed between the moisture and the hot air. Afterwards, as the moisture contained in the clothes is dried, the drum outlet temperature begins to rise when it becomes difficult to perform heat exchange between the moisture and the hot air.
  • the inlet temperature detected by the second temperature sensor 142 that is, the temperature of the hot air introduced into the outer barrel 20, is higher than the outlet temperature and is approximately constant. Therefore, after the clothes are dried to a certain extent, as the drying rate of the clothes increases, the temperature difference between the inlet temperature and the outlet temperature becomes smaller.
  • the temperature difference between the inlet temperature and the outlet temperature when the predetermined drying rate is reached is obtained by performing a preliminary experiment, etc., and is set as a predetermined value for determining the end of drying.
  • the control unit 301 determines that the predetermined drying rate has been reached, and thus the drying can be ended.
  • control unit 301 may determine that drying can be terminated when a predetermined drying time has elapsed after the blower fan 120 and the heater 132 start operating.
  • control unit 301 controls the moving motor 260 to rotate in the reverse direction by the second rotation angle to return the closing member 230 to the reference position.
  • the timing of setting the resonance frequency f of the Helmholtz resonator 210 to the first resonance frequency is not limited to before starting the blower fan 120, but may be after starting the blower fan 120.
  • the timing of changing the resonance frequency f of the Helmholtz resonator 210 to the second resonance frequency is not limited to after the rotation speed of the blower fan 120 is increased to the second rotation speed, but may be after the circulating air is appropriately heated and before the rotation speed of the blower fan 120 is increased to the second rotation speed.
  • the blocking member 230 may not return to the reference position, but may stay at the position corresponding to the second resonance frequency.
  • the control unit 301 obtains the rotation angle of the difference between the first rotation angle and the second rotation angle, and rotates the moving motor 260 forward or reversely by the rotation angle of the difference.
  • the blocking member 230 blocks a part of the opening 212a of the head 212 in such a way that the opening area S becomes the opening area S corresponding to the first resonance frequency.
  • the washer-dryer 1 includes a noise reduction device 200 disposed in the circulation air duct 110.
  • the noise reduction device 200 includes a Helmholtz resonator 210 and a change mechanism 220 for changing the resonance frequency f of the Helmholtz resonator 210.
  • the control unit 301 controls the change mechanism 220 so that the resonance frequency f changes according to the rotation speed of the blower fan 120.
  • the resonance frequency f of the Helmholtz resonator 210 can be changed accordingly.
  • the Helmholtz resonator 210 can effectively reduce the noise from the circulation air duct 110 during the drying process.
  • the Helmholtz resonator 210 includes a hollow cavity 211 and a cylindrical head 212 extending from the cavity 211 , and an opening 212a of the head 212 is connected to the inside of the circulation air path 110 . Then, the changing mechanism 220 changes the opening area S of the head 212 .
  • the resonance frequency f can be changed by changing the opening area S of the head portion 212 of the Helmholtz resonator 210 .
  • the changing mechanism 220 includes a closing member 230 for closing the opening 212 a of the head 212 and a moving device 240 for moving the closing member 230 so that the opening area S changes, and the control unit 301 controls the moving device 240 .
  • the Helmholtz resonator 210 is not a structure in which the cavity 211 and the head 212 can be extended and retracted, so it has a simple structure.
  • the control unit 301 rotates the blower fan 120 at a second speed higher than the first speed after rotating at a first speed during the drying process, and the control unit 301 controls the change mechanism 220 in the following manner: when the blower fan 120 rotates at the first speed, the Helmholtz resonator 210 has a first resonance frequency corresponding to the first speed, and when the blower fan 120 rotates at the second speed, the Helmholtz resonator 210 has a second resonance frequency corresponding to the second speed.
  • the first resonance frequency can be made consistent with (including substantially consistent with) the peak frequency of the sound generated in the circulating air path 110 at the first speed
  • the second resonance frequency can be made consistent with (including substantially consistent with) the peak frequency of the sound generated in the circulating air path 110 at the second speed.
  • the air circulating between the circulation air passage 110 and the outer tub 20 By rotating the blower fan 120 at a first speed when the wind is cold and at a second speed after the wind is appropriately heated, the noise from the circulating air duct 110 at the first speed and the noise from the circulating air duct 110 at the second speed can be reliably reduced.
  • Fig. 8 (a) and (b) are side views of the noise reduction device 400 of Modification 1.
  • Fig. 9 is a front view of the noise reduction device 400 of Modification 1.
  • Fig. 8 (a) shows the noise reduction device 400 in a state where the head 412 of the Helmholtz resonator 410 is extended to the longest, and (b) shows the noise reduction device 400 in a state where the head 412 of the Helmholtz resonator 410 is contracted to the shortest.
  • the noise reduction device 400 of this modification can be arranged near the circulation air duct 110 instead of the noise reduction device 200 of the above-described embodiment.
  • the noise reduction device 400 includes a Helmholtz resonator 410 and a changing mechanism 420 .
  • the Helmholtz resonator 410 includes: a hollow cavity portion 411; and a head portion 412 extending from the cavity portion 411.
  • the cavity portion 411 has a substantially cylindrical box shape.
  • the head portion 412 is composed of a cylindrical first cylinder portion 412a formed integrally with the cavity portion 411 and a cylindrical second cylinder portion 412b embedded in the outer periphery of the first cylinder portion 412a.
  • the first cylinder portion 412a can move relative to the second cylinder portion 412b in the axial direction of the first cylinder portion 412a.
  • the interior of the head portion 412 is connected to the interior of the cavity portion 411.
  • the second tube portion 412b of the head portion 412 is connected to the introduction duct 114 of the circulation passage 110.
  • the opening 412c of the head portion 412 is connected to the inside of the circulation passage 110, and the inside of the Helmholtz resonator 410 is connected to the inside of the circulation passage 110.
  • the changing mechanism 420 changes the resonance frequency f of the Helmholtz resonator 410 by changing the length L of the head 212.
  • the retractable head 412 is included in the changing mechanism 420. Furthermore, the changing mechanism 420 includes a retracting device 430 that retracts the head 412.
  • the telescopic device 430 includes a telescopic motor 440 as a power source for moving the second cylinder 412 b to telescope the head 412 , and a rack and pinion mechanism 450 for converting the rotational motion of the telescopic motor 440 into linear motion and transmitting the linear motion to the cavity 411 .
  • the telescopic motor 440 is fixed to the lower surface of the housing 113 via a motor bracket (not shown).
  • the length L of the head 412 of the Helmholtz resonator 410 becomes the longest.
  • the telescopic motor 440 and the gear 452 rotate forward from this state (the telescopic motor 440 rotates clockwise when viewed from the front)
  • the cavity 411 moves in a manner close to the second cylinder 412b
  • the first cylinder 412a moves in a manner such that the overlap amount between the first cylinder 412a and the second cylinder 412b increases.
  • the length L of the head 212 becomes shorter.
  • the positions of the cavity 411 and the first tube 412a where the length L of the head 412 is the longest are set as the reference positions.
  • the position sensor (not shown) detects that the cavity 411 and the first tube 412a are at the reference positions.
  • the resonance frequency f of the Helmholtz resonator 410 decreases as the length L of the head 412 increases.
  • the length L of the head 412 can be determined by the movement of the cavity 411 and the first cylinder 412a from the reference position, that is, the rotation angle of the telescopic motor 440 from the reference position corresponding to the movement.
  • the above-mentioned formula for the resonance frequency f is used to calculate the length L of the head 412 at which the resonance frequency f of the Helmholtz resonator 410 reaches the first resonance frequency. Then, when the cavity portion 411 and the first cylinder portion 412a are located so that the length L of the head 412 becomes the calculated length L of the head 412, the rotation angle of the telescopic motor 440 from the reference position is set to the first rotation angle corresponding to the first resonance frequency, that is, the first rotation speed. In the same way, the second rotation angle corresponding to the second resonance frequency, that is, the second rotation speed is set. These first rotation angles and second rotation angles are stored in the storage unit 302.
  • the control unit 301 performs the control process for the drying process shown in FIG7 .
  • the control unit 301 controls the change mechanism 420 (retractable device 430) to rotate the retractable motor 440 forward by a first rotation angle from the reference position when the resonance frequency f of the Helmholtz resonator 410 is set to the first resonance frequency.
  • the cavity 411 and the first cylinder 430 located at the reference position are rotated forward by a first rotation angle.
  • the head 412a moves to a position where the length L of the head 412 becomes a length corresponding to the first resonance frequency.
  • step S7 when the control unit 301 changes the resonance frequency f of the Helmholtz resonator 410 to the second resonance frequency, the differential rotation angle between the second rotation angle and the first rotation angle is obtained, and the telescopic motor 440 is rotated forward or reversely by the differential rotation angle. As a result, the cavity 411 and the first cylinder 412a are moved to a position where the length L of the head 412 becomes a length corresponding to the second resonance frequency.
  • the resonance frequency f can be changed by changing the length L of the head portion 412 of the Helmholtz resonator 410 .
  • the length L of the head portion 412 can be changed, and as a result, the resonance frequency f of the Helmholtz resonator 410 can be changed.
  • FIG. 10 shows the noise reduction device 500 in a state where the cavity 511 of the Helmholtz resonator 510 is stretched to the longest, and Fig. 10 (b) shows the noise reduction device 500 in a state where the cavity 511 of the Helmholtz resonator 510 is contracted to the shortest.
  • the noise reduction device 500 of this modification can be arranged near the circulation air duct 110 instead of the noise reduction device 200 of the above-described embodiment.
  • the noise reduction device 500 includes a Helmholtz resonator 510 and a changing mechanism 520 .
  • the head 512 is connected to the introduction duct 114 of the circulation air passage 110 .
  • the opening 512 a of the head 512 is connected to the inside of the circulation air passage 110
  • the inside of the Helmholtz resonator 510 is connected to the inside of the circulation air passage 110 .
  • the changing mechanism 520 changes the resonance frequency f of the Helmholtz resonator 510 by changing the volume V of the cavity 511.
  • the retractable cavity 511 is included in the changing mechanism 520.
  • the device includes an expansion and contraction device 530 for expanding and contracting the cavity portion 511 .
  • the telescopic device 530 includes a telescopic motor 540 as a power source for extending and retracting the cavity portion 511 , and a cam 550 in the shape of an elliptical plate.
  • the telescopic motor 540 is a stepping motor and is disposed at the rear of the cavity 511.
  • the telescopic motor 540 is driven by the second motor driving unit 311.
  • the cam 550 is fixed to the rotating shaft 541 of the telescopic motor 540 and contacts the rear cylinder 511b of the cavity 511.
  • the front tube 511a of the cavity 511 of the Helmholtz resonator 510 is fixed to the lower surface of the housing 113 of the circulation air duct 110 via a resonator bracket (not shown).
  • the telescopic motor 540 is fixed to the lower surface of the housing 113 via a motor bracket (not shown).
  • the resonance frequency f of the Helmholtz resonator 510 decreases as the volume V of the cavity 511 increases.
  • the volume V of the cavity 511 can be determined by the rotation angle of the cam 550 from the reference position, that is, the rotation angle of the telescopic motor 440 .
  • the volume V of the cavity 511 at which the resonance frequency f of the Helmholtz resonator 510 reaches the first resonance frequency is calculated using the above-mentioned calculation formula of the resonance frequency f. Then, when the cavity 511 is extended and contracted so that the volume V becomes the calculated volume V, the rotation angle of the telescopic motor 540 from the reference position is set to the first rotation angle corresponding to the first resonance frequency, that is, the first rotation speed. In the same way, the second rotation angle corresponding to the second resonance frequency, that is, the second rotation speed is set. These first rotation angle and second rotation angle are stored in the storage unit 302.
  • the control unit 301 executes the control process for the drying process shown in FIG. 7.
  • step S1 the control unit 301 controls the change mechanism 520 (retractable device 530),
  • the resonance frequency f of the Helmholtz resonator 510 is set to the first resonance frequency
  • the telescopic motor 540 is rotated forward from the reference position by the first rotation angle.
  • the length of the cavity 511 is changed so as to obtain a volume V corresponding to the first resonance frequency.
  • step S7 when the control unit 301 changes the resonance frequency f of the Helmholtz resonator 510 to the second resonance frequency, the differential rotation angle between the second rotation angle and the first rotation angle is obtained, and the telescopic motor 540 is rotated forward or reversely by the differential rotation angle.
  • the length of the cavity 511 is changed so as to become the volume V corresponding to the second resonance frequency.
  • the resonance frequency f can be changed by changing the volume V of the cavity portion 511 of the Helmholtz resonator 510 .
  • the volume V of the cavity portion 511 can be changed, and as a result, the resonance frequency f of the Helmholtz resonator 510 can be changed.
  • the washer-dryer 1 may also be provided with a spray device for spraying mist containing components having antibacterial effects such as silver ions into the drum 23.
  • a spray device for spraying mist containing components having antibacterial effects such as silver ions into the drum 23.
  • the rotation speed of the blower fan 120 is reduced from the second rotation speed to a third rotation speed lower than the second rotation speed.
  • the resonance frequency f of the Helmholtz resonator 210 can be set to a third resonance frequency that can offset the peak frequency of the sound generated in the circulating air path 110 when the blower fan 120 rotates at the third rotation speed, etc. through the control unit 301.
  • the third rotation speed may also be the same rotation speed as the first rotation speed.
  • the third resonance frequency is the same frequency as the first resonance frequency.
  • the noise reduction device 200 is arranged near the portion generating the largest noise in the circulation air duct 110, for example, near the inlet end 114a of the introduction duct 114.
  • the noise reduction device 200 may be arranged near each of the portions generating large noise in the circulation air duct 110.
  • the opening area S of the head 212, the length L of the head 412, and the volume V of the cavity 511 are calculated by using the calculation formula of the resonance frequency f, so that the resonance frequency f of the Helmholtz resonator 210, 410, 510 reaches the first resonance frequency and the second resonance frequency.
  • the opening area S, the length L of the head 412, and the volume V of the cavity 511 can be adjusted in a preliminary test or the like, and the sound pressure reduction of the peak frequency at the first rotation speed and the second rotation speed can be actually obtained.
  • the opening area S, the length L of the head 412, and the volume V of the cavity 511 determine the opening area S of the head 212, the length L of the head 412, and the volume V of the cavity 511 at which the resonance frequency f becomes the first resonance frequency and the second resonance frequency.
  • the Helmholtz resonator 410 includes a head 412 that can be extended and retracted by moving the second tube portion 412b embedded in the outer periphery of the first tube portion 412a.
  • the Helmholtz resonator 410 the following structure can also be adopted: similar to the structure of the cavity portion 511 of the Helmholtz resonator 510 in the above-mentioned modification example 2 that allows the cavity portion 511 to be extended and retracted, the head 412 can be extended and retracted by providing a bellows portion.
  • the structure of the changing mechanism for changing the length L of the head 412 of the Helmholtz resonator 410 is not limited to the structure of the above-mentioned Change Example 1.
  • the head 412 is not necessarily straight and can also be curved. Therefore, for example, the same method as the method of changing the length of the tube in a piston valve type trumpet can be adopted in the changing mechanism. In this case, the piston valve can be driven by an appropriate actuator.
  • the changing mechanism can also be adopted in the same method as the method of changing the length of the tube in a rotary valve type trumpet. In this case, the rotary valve can be driven by an appropriate actuator.
  • the Helmholtz resonator 510 includes a cavity portion 511 that can be extended and retracted by providing a corrugated portion 511c.
  • the Helmholtz resonator 510 may also include a cavity portion that can be extended and retracted by changing the overlap amount of the front and rear tube portions of the head portion overlapping in the front-to-back direction, similar to the configuration that allows the head portion 412 of the Helmholtz resonator 410 to be extended and retracted in the above-mentioned modification 1.
  • the extension device may be composed of a rack and pinion mechanism and an extension motor in order to move one of the front and rear tube portions.
  • the cavity portion 511 of the Helmholtz resonator 510 can expand and contract in the direction in which the head portion 512 extends.
  • the cavity portion 511 may expand and contract in the direction perpendicular to the direction in which the head portion 512 extends.
  • a decompression device having a change mechanism capable of changing two or all of the opening area S of the head of the Helmholtz resonator, the length L of the head, and the volume V of the cavity may be arranged near the circulating air duct 110.
  • the change mechanism may be appropriately combined with the configurations shown in the above-mentioned embodiment, the above-mentioned modification example 1, and the above-mentioned modification example 2.
  • the drying device 100 is disposed in the upper portion of the housing 10 .
  • the drying device 100 may be disposed in the lower portion of the housing 10 .
  • the washer-dryer 1 is a drum-type washer-dryer having a horizontal drum 23.
  • the present invention can also be applied to a so-called vertical washer-dryer having a vertical-axis washing-spinning drum having a pulsator as an inner drum in an outer drum.

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  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
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Abstract

本发明提供一种能利用亥姆霍兹共鸣器来有效地降低烘干过程中的噪音的洗干一体机。洗干一体机(1)具备：外桶(20)，配置于箱体(10)内；滚筒(23)，能旋转地配置于外桶(20)内，容纳洗涤物；循环风路(110)，连接于外桶(20)；鼓风扇(120)，使空气在外桶(20)与循环风路(110)之间循环；加热器(132)，对流过循环风路(110)的空气进行加热；降音装置(200)，配置于循环风路(110)附近，用于降低循环风路(110)中产生的声音；以及控制部。降音装置(200)包括：亥姆霍兹共鸣器(210)；以及变更机构(220)，用于变更亥姆霍兹共鸣器(210)的共鸣频率。控制部控制变更机构(220)，使得共鸣频率根据鼓风扇(120)的转速而变更。

Description

洗干一体机 技术领域
本发明涉及一种洗干一体机。
背景技术
在能进行从洗涤物的洗涤到烘干的洗干一体机中，烘干过程容易花费较长时间，烘干过程中的降噪的要求较高。在烘干过程中，由鼓风扇的旋转而产生的风流过风路时发出的声音成为噪音的主要原因。因此，通过降低风路中产生的噪音，能抑制烘干过程中的噪音。
在以下的专利文献1中，记载了为了降低脱水过程中产生的噪音而在对外桶等进行弹性支承的外框的内侧配置有亥姆霍兹(Helmholtz)共鸣器的洗衣机。
考虑将上述专利文献1的洗衣机所具备的亥姆霍兹共鸣器用于洗干一体机的烘干过程中的噪音的降低。
风路中产生的声音由各种频率成分构成，在其频谱中存在声压达到峰值的频率。因此，亥姆霍兹共鸣器构成为使共鸣频率(共振频率)与声压达到峰值的频率一致。通过亥姆霍兹共鸣器的共鸣作用，声压达到峰值的频率及其附近的频率被抵消，这些频率的声压降低，其结果是噪音降低。
在洗干一体机中，在烘干过程中，鼓风扇能以设定的多个转速进行旋转。例如，在洗干一体机具有使风在外桶与风路之间循环的构成的情况下，在风是冷风的期间，即使大量的风与洗涤物接触，洗涤物也难以烘干。因此，在烘干过程的开始初期，鼓风扇的转速被抑制得较低，在循环的风通过加热器的热量而适当地升温后，鼓风扇的转速被提高，以便能降低烘干过程中的总耗电。如此，在鼓风扇的转速变化的情况下，风路内的风的流速、流量等会发生变化，因此与此相应，风路中产生的声音的频谱可能发生变化，声压达到峰值的频率可能发生变化。
然而，在上述专利文献1所示的亥姆霍兹共鸣器中，无法根据声压达到峰值的频率的变化来使共鸣频率变化，因此难以有效地降低烘干过程中的噪音。
现有技术文献
专利文献
专利文献1：日本特开平2－26598号公报
发明内容
发明所要解决的问题
本发明是鉴于上述问题而完成的，其目的在于提供一种能利用亥姆霍兹共鸣器来有效地降低烘干过程中的噪音的洗干一体机。
用于解决问题的方案
本发明的主要方案涉及一种洗干一体机，具备：外桶，配置于箱体内；内桶，能旋转地配置于所述外桶内，容纳洗涤物；循环风路，连接于所述外桶；鼓风扇，使空气在所述外桶与所述循环风路之间循环；加热器，对流过所述循环风路的空气进行加热；降音装置，配置于所述循环风路附近，用于降低所述循环风路中产生的声音；以及控制部。其中，所述降音装置包括：亥姆霍兹共鸣器；以及变更机构，用于变更所述亥姆霍兹共鸣器的共鸣频率。所述控制部控制所述变更机构，使得所述共鸣频率根据所述鼓风扇的转速而变更。
根据本方案的洗干一体机，即使在循环风路中产生的声音的频谱通过鼓风扇的转速变化而变化，也能与此相应地变更亥姆霍兹共鸣器的共鸣频率。由此，能利用亥姆霍兹共鸣器来有效地降低烘干过程中来自循环风路的噪音。
在本方案地洗干一体机中，可以采用如下构成，即，所述亥姆霍兹共鸣器包括：空洞的腔体部；以及筒状的头部，从所述腔体部延伸。在该情况下，所述头部的开口与所述循环风路的内部相连。所述变更机构可以采用变更所述头部的开口面积、所述头部的长度或者所述腔体部的体积的构成。
根据该构成，通过变更亥姆霍兹共鸣器的头部的开口面积、头部的长度或者腔体部的体积，能变更共鸣频率。
如上所述，在变更机构采用变更所述头部的开口面积、所述头部的长度或者所述腔体部的体积的构成的情况下，所述变更机构可以采用如下构成，即，包括：闭塞构件，闭塞所述头部的开口；以及移动装置，以使所述开口面积变化的方式使所述闭塞构件移动。在该情况下，可以采用如下构成：所述控制部控制所述移动装置。
如果采用这样的构成，通过由闭塞构件使头部的开口的闭塞量变化，能使头部的开口面积变化，其结果是，能使亥姆霍兹共鸣器的共鸣频率变化。
如上所述，在变更机构采用变更所述头部的开口面积、所述头部的长度或者所述腔体部的体积的构成的情况下，所述变更机构可以采用如下构成，即，包括：所述头部，能以长度变化的方式伸缩；以及伸缩装置，使所述头部伸缩。在该情况下，可以采用如下构成：所述控制部控制所述伸缩装置。
如果采用这样的构成，通过使头部伸缩，能使头部的长度变化，其结果是，能使亥姆霍兹共鸣器的共鸣频率变化。
如上所述，在变更机构采用变更所述头部的开口面积、所述头部的长度或者所述腔体部的体积的构成的情况下，所述变更机构可以采用如下构成，即，包括：所述腔体部，能以体积变化的方式伸缩；以及伸缩装置，使所述腔体部伸缩。在该情况下，可以采用如下构成：所述控制部控制所述伸缩装置。
如果采用这样的构成，通过使腔体部伸缩，能使腔体部的体积变化，其结果是，能使亥姆霍兹共鸣器的共鸣频率变化。
在本方案的洗干一体机中，可以采用如下构成，即，所述控制部在烘干过程中使所述鼓风扇在以第一转速旋转后以比所述第一转速高的第二转速旋转，所述控制部以如下方式控制所述变更机构：在所述鼓风扇以所述第一转速旋转时，所述亥姆霍兹共鸣器具有与所述第一转速对应的第一共鸣频率，在所述鼓风扇以所述第二转速旋转时，所述亥姆霍兹共鸣器具有与所述第二转速对应的第二共鸣频率。
例如，能使第一共鸣频率与当鼓风扇以第一转速旋转时循环风路中产生的声音的频谱中的声压达到峰值的频率一致(包括大致一致)。此外，能使第二共鸣频率与在鼓风扇以第二转速旋转时循环风路中产生的声音的频谱中的声压 达到峰值的频率一致(包括大致一致)。
根据上述构成，在烘干过程中，在进行了在循环风路与外桶之间循环的风是冷风的期间使鼓风扇以第一转速旋转并在风适当地升温后使鼓风扇以第二转速旋转的控制的情况下，能可靠地降低第一转速下的来自循环风路的噪音和第二转速下的来自循环风路的噪音。
发明效果
根据本发明，能提供一种能利用亥姆霍兹共鸣器来有效地降低烘干过程中的噪音的洗干一体机。
本发明的效果和意义通过以下所示的实施方式的说明会更加明了。不过，以下的实施方式仅仅是实施本发明时的一个示例，本发明不受以下实施方式中所记载的内容的任何限制。
附图说明
图1是表示实施方式的洗干一体机的构成的侧面剖视图。
图2中，(a)和(b)是实施方式的降音装置的侧面剖视图。
图3中，(a)是实施方式的降音装置的主视图，(b)是实施方式的亥姆霍兹共鸣器的立体图。
图4中，(a)是实施方式的变更机构的后视图，(b)是实施方式的保持构件的背面剖视图。
图5是表示实施方式的洗干一体机的构成的框图。
图6是示意性地表示实施方式的从循环风路发出的噪音的频谱的一个例子的图。
图7是表示实施方式的烘干过程中的控制部的控制动作的流程图。
图8中，(a)和(b)是变更例1的降音装置的侧视图。
图9是变更例1的降音装置的主视图。
图10中，(a)和(b)是变更例2的降音装置的侧视图，(c)是变更例2 的降音装置的主视图。
附图标记说明
10：箱体；20：外桶；23：滚筒(内桶)；110：循环风路；120：鼓风扇；
132：加热器；200：降音装置；210：亥姆霍兹共鸣器；211：腔体部；212：头部；212a：开口；220：变更机构；230：闭塞构件；240：移动装置；301：控制部；400：降音装置；410：亥姆霍兹共鸣器；411：腔体部；412：头部；420：变更机构；430：伸缩装置；500：降音装置；510：亥姆霍兹共鸣器；511：腔体部；512：头部；520：变更机构；530：伸缩装置。
具体实施方式
下面，参照附图对本发明的洗干一体机的一个实施方式进行说明。
图1是表示洗干一体机1的构成的侧面剖视图。
本实施方式的洗干一体机1是所谓的滚筒式的洗干一体机。洗干一体机1具备方形的箱体10。在箱体10的前表面形成有供洗涤物投入的圆形的投入口11。投入口11由开闭自由的门12覆盖。
在箱体10内配置有外桶20。外桶20由多个减震器21和弹簧22弹性支承。在外桶20内可旋转地配置有容纳洗涤物的滚筒23。滚筒23绕水平轴旋转。滚筒23在其前表面具有圆形的开口部23a。外桶20在滚筒23的开口部23a的前方具有圆形的开口部20a。洗涤物通过开口部23a取出投入滚筒23内。滚筒23相当于本发明的“内桶”。
外桶20在滚筒23的开口部23a的前方具有圆形的开口部20a。外桶20的开口部20a的周缘部和箱体10的投入口11的周缘部通过由弹性材料构成的环状的门衬垫(door packing)24连结。关闭的门12的周面与门衬垫24接触，投入口11与门12之间被水封。
在滚筒23的内周面形成有许多脱水孔23b。此外，在滚筒23的内周面沿周向等间隔地设有具有大致三棱柱形状的三个提升筋25。
在外桶20的后方配置有产生用于使滚筒23旋转的转矩的驱动马达30。驱 动马达30例如为外转子型的DC无刷马达。驱动马达30在清洗过程、漂洗过程以及烘干过程时以施加于滚筒23内的洗涤物的离心力小于重力而洗涤物会翻滚(tumbling)的转速使滚筒23旋转。另一方面，驱动马达30在脱水过程时以施加于滚筒23内的洗涤物的离心力远大于重力而洗涤物会贴附于滚筒23的内周面的转速使滚筒23旋转。
在外桶20的底部形成有排水口部20b。在排水口部20b设有开闭该排水口部20b的排水阀41。排水阀41例如包括阀门和使阀门开闭的力矩马达。排水阀41连接于排水软管42。排水阀41和排水软管42构成从外桶20内进行排水的排水部40。当排水阀41打开时，蓄于外桶20内的水经排水口部20b和排水软管42向机外排出。在排水软管42的中途配置有捕获线屑等异物的排水过滤器43。
在箱体10内的上部配置有供水部50。供水部50包括供水阀51和供水路52。供水路52的一端连接于供水阀51，另一端连接于设于外桶20的背面的注水口20c。当供水阀51打开时，来自水龙头的自来水流过供水路52并从注水口20c供给至外桶20内。
需要说明的是，供水部50也可以包括将液体洗涤剂、液体柔顺剂自动投入至外桶20内的自动投入装置。自动投入装置例如包括贮留液体洗涤剂、液体柔顺剂的液剂盒(tank)和将液剂盒内的液体洗涤剂、液体柔顺剂送出至供水路52内的泵。在该情况下，向供水路52内排出的液体洗涤剂、液体柔顺剂由流过供水路52的水送向外桶20内。
在箱体10内的上部配置有用于烘干滚筒23内的洗涤物的烘干装置100。烘干装置100具备循环风路110、鼓风扇120、冷却器131以及加热器132。
循环风路110连接于外桶20，循环风路110包括导出管道111、配置有鼓风扇120的风扇壳体(casing)112、配置有冷却器131和加热器132的外壳(housing)113、以及导入管道114。循环风路110在箱体10内配置于外桶20的上方。
导出管道111的一端连接于设于外桶20的背面的排气口20d，另一端连接于风扇壳体112的吸入口。排气口20d也可以设于外桶20的周面后部。
外壳113具有前后方向上长的箱状，配置于外桶20的上方且风扇壳体112 的前方。外壳113的后端连接于风扇壳体112的吐出口。导入管道114从外壳113的前端延伸并连接于设于门衬垫24的前上部的放出口20e。放出口20e朝向滚筒23的内部。
鼓风扇120例如为离心扇，包括容纳于风扇壳体112内的风扇121和用于对风扇121进行旋转驱动的风扇马达122。鼓风扇120使空气(风)在外桶20与循环风路110之间循环。经过排气口20d从外桶20内排出的空气按照导出管道111、风扇壳体112、外壳113、导入管道114的顺序流过循环风路110内，从放出口20e向外桶20内即滚筒23内放出。
冷却器131和加热器132为热交换器，冷却器131和加热器132分别配置于外壳113内的上游侧和下游侧。冷却器131和加热器132包括在热泵装置中。热泵装置包括与冷却器131和加热器132一起构成冷热回路的压缩机、减压器等。
通过压缩机的工作，低温的制冷剂在冷却器131的内部流动，高温的制冷剂在加热器132的内部流动。冷却器131通过与低温的制冷剂之间的热交换来冷却流过循环风路110内的空气，进行空气的除湿。加热器132通过与高温制冷剂之间的热交换来加热流过循环风路110内的除湿后的空气。
需要说明的是，冷却器131也可以为水冷式的热交换器等，加热器132也可以为半导体加热器等。
烘干装置100具备第一温度传感器141和第二温度传感器142。第一温度传感器141配置于循环风路110内的鼓风扇120的上游的位置即导出管道111内，并检测从外桶20内排出的空气(风)的温度来作为出口温度。第二温度传感器142配置于循环风路110内的加热器132的下游的位置即导入管道114内，并检测通过加热器132后向外桶20内导入的空气(风)的温度来作为入口温度。
在箱体10内，在循环风路110附近配置有用于降低循环风路110中产生的声音的降音装置200。在烘干过程中，当由鼓风扇120的旋转而产生的风流过循环风路110时，由该风的流动而产生的声音作为噪音从循环风路110发出。来自循环风路110的噪音成为烘干过程时从洗干一体机1发出的主要噪音。
循环风路110中产生的噪音的大小根据循环风路110的各部分中的风的流 动状况而各部分可能不同。因此，通过进行预先试验等测定噪音来确定循环风路110中产生最大噪音的部分，在该确定的部分配置降音装置200。
例如，在本实施方式中，在循环风路110中的导入管道114的入口端部114a附近配置有降音装置200。导入管道114的流路截面积比外壳113的流路截面积小，当风向导入管道114流入时，风速会提高。而且，在导入管道114的入口端部114a，循环风路110向下方大幅弯曲，在该弯曲部分，风的流动容易变乱。因此，认为在导入管道114的入口端部114a容易产生大的噪音。
图2的(a)和(b)是降音装置200的侧面剖视图。图3的(a)是降音装置200的主视图，图3的(b)是亥姆霍兹共鸣器210的立体图。图4的(a)是变更机构220的后视图，图4的(b)是保持构件250的背面剖视图。在图2的(a)示出了亥姆霍兹共鸣器210的头部212的开口212a全开的状态的降音装置200，在图2的(b)示出了亥姆霍兹共鸣器210的头部212的开口212a的一部分被闭塞构件230闭塞的状态的降音装置200。
降音装置200具备产生亥姆霍兹共鸣的亥姆霍兹共鸣器210和用于变更亥姆霍兹共鸣器210的共鸣频率的变更机构220。
亥姆霍兹共鸣器210包括空洞的腔体部211和从腔体部211延伸的头部212。腔体部211具有方形的箱状，头部212具有方形的筒状。头部212的内部与腔体部211的内部相连。
亥姆霍兹共鸣器210的共鸣频率f由腔体部211的体积(内容积)V、头部212的长度L、头部212的开口面积S决定，能利用这些体积V、长度L以及开口面积S和声速C，通过以下的共鸣频率f的运算式求出。
[数式1]
变更机构220通过变更头部212的开口面积S来变更亥姆霍兹共鸣器210的共鸣频率f。因此，变更机构220包括：闭塞构件230，闭塞头部212的开口212a；以及移动装置240，以头部212的开口面积S变化的方式使闭塞构件230 移动。
闭塞构件230形成为方形的平板状，具有比头部212的开口212a大的尺寸。
移动装置240包括：保持构件250，可滑动移动地保持闭塞构件230；移动马达260，作为用于使闭塞构件230移动的动力源；以及齿条齿轮机构270，将移动马达260的旋转运动转换为直线运动并传递至闭塞构件230。
保持构件250具有方形的板状。在保持构件250的上部形成有方形的开口部251。开口部251具有与亥姆霍兹共鸣器210的头部212的开口212a相同的形状和尺寸。而且，在保持构件250的内部形成有从开口部251向下方延伸并贯通下表面的滑动孔252。滑动孔252具有与闭塞构件230相同的左右和前后的尺寸。滑动孔252的上下的尺寸比闭塞构件230的上下的尺寸小。闭塞构件230在上下方向上可滑动移动地插入滑动孔252。
在保持构件250的前表面，在开口部251的周围形成有向前方突出的方形框状的前部连接口253。而且，在保持构件250的后表面，在开口部251的周围形成有向后方突出的方形框状的后部连接口254。
保持构件250固定于循环风路110的导入管道114的后面。保持构件250的前部连接口253连接于导入管道114的连接口114b。而且，亥姆霍兹共鸣器210的头部212连接于保持构件250的后部连接口254。由此，头部212的开口212a经由保持构件250的开口部251与循环风路110的内部相连，亥姆霍兹共鸣器210的内部与循环风路110的内部相连。
移动马达260为步进马达，配置于保持构件250的下方。在移动马达260上装配有托架280。移动马达260经由托架280固定于导入管道114的后表面。
齿条齿轮机构270由齿条271和齿轮272构成。齿条271以沿闭塞构件230的移动方向即上下方向延伸的方式固定于闭塞构件230的后表面的下部。齿轮272固定于移动马达260的旋转轴261，并且与齿条271啮合。
如图2的(a)所示，当闭塞构件230位于基准位置时，亥姆霍兹共鸣器210的头部212的开口212a全开。闭塞构件230的上端缘与保持构件250的开口部251的下端缘一致。通过未图示的光敏传感器等位置传感器来检测闭塞构件230位于基准位置。
当移动马达260和齿轮272从闭塞构件230位于基准位置的状态开始正转(在正面观察移动马达260以顺时针旋转)时，闭塞构件230向上方向即接近头部212的开口212a的方向滑动移动。由此，如图2的(b)所示，头部212的开口212a的一部分被闭塞构件230闭塞。
头部212的开口面积S根据闭塞构件230对开口212a的闭塞量而变化。开口面积S越小，共鸣频率f越小。头部212的开口面积S可以由从基准位置起的闭塞构件230的移动量，即与该移动量相当的从基准位置起的移动马达260的旋转角度来规定。
图5是表示洗干一体机1的构成的框图。
洗干一体机1除了上述构成以外，还具备：控制部301、存储部302、操作部303、显示部304、水位传感器305、第一马达驱动部306、供水驱动部307、排水驱动部308、风扇驱动部309、压缩机驱动部310以及第二马达驱动部311。
操作部303包括：电源按钮，进行电源的接入和断开；模式选择按钮，用于从洗涤运转、洗涤烘干运转等运转的多个运转模式中选择任意的运转模式；以及开始按钮，用于使运转开始。操作部303将与用户操作过的操作按钮对应的输入信号输出至控制部301。
显示部304包括LED等发光元件、液晶面板等显示器，根据来自控制部301的控制信号，进行所选择的模式的显示、洗涤运转的进行状况的显示、异常的通知等。
水位传感器305检测外桶20内的水位，并将与水位对应的水位信号输出至控制部301。
第一温度传感器141和第二温度传感器142分别将与所检测出的出口温度和入口温度对应的温度信号输出至控制部301。
第一马达驱动部306根据来自控制部301的控制信号对驱动马达30进行驱动。第一马达驱动部306调整驱动电力使得驱动马达30以设定的转速进行旋转。
供水驱动部307根据来自控制部301的控制信号驱动供水阀51。排水驱动部308根据来自控制部301的控制信号驱动排水阀41。
风扇驱动部309根据来自控制部301的控制信号驱动鼓风扇120的风扇马达122。风扇驱动部309调整驱动电力使得风扇马达122以设定的转速进行旋转。
压缩机驱动部310根据来自控制部301的控制信号驱动压缩机133，使冷却器131和加热器132工作。第二马达驱动部311根据来自控制部301的控制信号驱动移动装置240的移动马达260。
存储部302包括EEPROM(电可擦可编程只读存储器)、RAM(随机存取存储器)等。存储部302中存储有用于执行各种模式的运转的程序。此外，存储部302中存储用于执行这些程序的各种参数、各种控制标记。
控制部301包括CPU(中央处理器)等，基于来自操作部303、水位传感器305、第一温度传感器141、第二温度传感器142等的各信号，并根据存储于存储部302的程序来控制显示部304、第一马达驱动部306、供水驱动部307、排水驱动部308、风扇驱动部309、压缩机驱动部310、第二马达驱动部311等。
进而，在洗干一体机1中，基于用户对操作部303的操作，在控制部301的控制下进行各种运转模式的洗涤烘干运转、洗涤运转以及烘干运转。在洗涤烘干运转中，依次进行清洗过程、中间脱水过程、漂洗过程、最终脱水过程以及烘干过程。在洗涤运转中，从清洗过程进行到最终脱水过程而不进行烘干过程。在烘干运转中，仅进行烘干过程。根据运转模式，有时会进行两次以上的漂洗过程和中间脱水过程。
在清洗过程中，向外桶20内蓄留含洗涤剂的水至与容纳于滚筒23内的洗涤物的负荷量对应的洗涤水位，通过反复进行滚筒23的正转和反转，浸泡于该水中的洗涤物在滚筒23内翻滚。含洗涤剂的水浸透至洗涤物的内部，通过洗涤剂的效力和由翻滚产生的机械力，洗涤物的污垢被去除。
在漂洗过程中，在外桶20内蓄水至漂洗水位的状态下，滚筒23进行正转和反转，洗涤物在滚筒23内翻滚。由此，洗涤物中所含的洗涤剂与水一同被排出，洗涤物被漂洗。
在中间脱水过程和最终脱水过程中，驱动马达30单向高速旋转，滚筒23以作用于滚筒23内的洗涤物的离心力远大于重力的转速单向旋转。通过离心力的作用，洗涤物被按压在滚筒23的周面壁上而被脱水。
在烘干过程中，通过鼓风扇120的工作，空气即风在外桶20与循环风路110之间循环，通过加热器132的工作，导入至外桶20的风被加热而成为热风。进而，滚筒23进行正转和反转，洗涤物在滚筒23内翻滚。
从放出口20e被放出至滚筒23内的热风与翻滚的洗涤物接触来烘干洗涤物。从洗涤物中剥离了水分的热风从排气口20d向循环风路110返回。在循环风路110内的热风在被加热器132加热前经过冷却器131而被冷却器131除湿。
如上所述，在本实施方式的洗干一体机1中，为了降低烘干过程中的噪音，在循环风路110附近包括亥姆霍兹共鸣器210，并且具备能变更该亥姆霍兹共鸣器210的共鸣频率f的降音装置200。
图6是示意性地表示在循环风路110产生的声音的频谱的一个例子的图。
如图6所示，在循环风路110中产生的声音由各种频率成分构成，在其频谱中，存在声压达到峰值的频率。当使亥姆霍兹共鸣器210的共鸣频率f与声压达到峰值的频率一致(包括大致一致)时，该频率及其附近的频率被共鸣作用抵消，这些频率的声压降低。其结果是，能降低来自循环风路110的噪音。以下，为了方便，将声压达到峰值的频率称为“峰值频率”。
在烘干过程中，在外桶20与循环风路110之间循环的风是冷风的期间，即使大量的风与洗涤物接触，洗涤物也难以烘干。因此，在洗干一体机1中，在烘干过程的开始初期，将鼓风扇120的转速抑制得较低，在循环风通过加热器132的热量适当地升温后，鼓风扇120的转速被提高，以便能降低烘干过程中的总耗电。即，鼓风扇120的转速在开始当初设定为第一转速(例如，3000rpm)，在风变成高温后，鼓风扇120的转速设定为比第一转速高的第二转速(例如，5000rpm)。
如此，在鼓风扇120的转速变化的情况下，循环风路110内的风的流速、流量等会发生变化，因此与此相应，在循环风路110中产生的声音的频谱可能发生变化，峰值频率可能发生变化。
在本实施方式中，在配置有降音装置200的位置，利用频率测定器来测定鼓风扇120以第一转速和第二转速旋转时循环风路110中产生的各声音的频谱，从而指定第一转速下的峰值频率和第二转速下的峰值频率。然后，第一转速下 的峰值频率被确定为鼓风扇120以第一转速旋转时的亥姆霍兹共鸣器210的共鸣频率f，即与第一转速对应的第一共鸣频率。同样，第二转速下的峰值频率被确定为鼓风扇120以第二转速旋转时的共鸣频率f，即与第二转速对应的第二共鸣频率。
利用上述的共鸣频率f的运算式求出亥姆霍兹共鸣器210的共鸣频率f达到第一共鸣频率的头部212的开口面积S。然后，用于以使开口面积S变成所求出的开口面积S的方式通过闭塞构件230闭塞头部212的开口212a的、从基准位置起的移动马达260的旋转角度被设定为与第一共鸣频率，即第一转速对应的第一旋转角度。通过同样的方法，设定与第二共鸣频率，即第二转速对应的第二旋转角度。这些第一旋转角度和第二旋转角度存储于存储部302。
需要说明的是，在亥姆霍兹共鸣器210具有第一共鸣频率或第二共鸣频率时的头部212的开口面积S为头部212的开口212a全开时的开口面积S的情况下，第一旋转角度或第二旋转角度被设定为0。在该情况下，移动马达260不从基准位置旋转。
图7是表示烘干过程中的控制部301的控制动作的流程图。
参照图7，当烘干过程开始时，在降音装置200中，控制部301控制变更机构220(移动装置240)，将亥姆霍兹共鸣器210的共鸣频率f设定为第一共鸣频率(S1)。即，控制部301使移动马达260从基准位置正转第一旋转角度。由此，闭塞构件230从基准位置滑动移动，以使开口面积S变成与第一共鸣频率对应的开口面积S的方式闭塞头部212的开口212a的一部分。
接着，控制部301使鼓风扇120起动并以第一转速旋转(S2)。此外，控制部301通过使压缩机133工作，使冷却器131和加热器132工作(S3)。进而，控制部301起动驱动马达30，使滚筒23以该滚筒23内的洗涤物翻滚的转速(例如，45rpm)旋转(S4)。滚筒23也可以每隔规定时间变更旋转方向。
通过鼓风扇120的旋转，空气即风在循环风路110与外桶20之间被加热器132加热的同时进行循环。在烘干过程的开始初期，从加热器132向循环风传递的热量用于加热外桶20、滚筒23以及循环风路110而被消耗。因此，循环风本身的温度难以上升。当外桶20、滚筒23以及循环风路110变热时，循环风的温 度逐渐地上升。
在鼓风扇120以第一转速旋转的期间，在导入管道114的入口端部114a的部分，产生循环风路110中最大的噪音。产生的噪音的峰值频率与配置于入口端部114a附近的亥姆霍兹共鸣器210的第一共鸣频率一致。由此，峰值频率、其附近的频率被抵消，噪音被降低。
控制部301判定循环风是否适当地升温(S5)。例如，控制部301通过第一温度传感器141检测从外桶20内排出的循环风的温度，在该温度达到规定温度时判定为循环风适当地升温。也可以是，在鼓风扇120和加热器132开始工作后经过了规定时间时，控制部301判定为循环风适当地升温。
当控制部301判定为循环风适当地升温时(S5：是)，使鼓风扇120的转速上升至第二转速(S6)。由此，循环风的风量增加。通过大量的高温的循环风与滚筒23内的洗涤物接触，洗涤物容易烘干。
进而，在降音装置200中，控制部301控制变更机构220(移动装置240)，将亥姆霍兹共鸣器210的共鸣频率f变更为第二共鸣频率(S7)。即，控制部301求出第二旋转角度与第一旋转角度之间的差分的旋转角度，使移动马达260旋转差分的旋转角度。如果差分的旋转角度为正值，移动马达260正转，闭塞构件230向闭塞量变多的方向移动，如果差分的旋转角度为负值，移动马达260逆转，闭塞构件230向闭塞量变少的方向移动。由此，闭塞构件230以使开口面积S变成与第二共鸣频率对应的开口面积S的方式闭塞头部212的开口212a的一部分。
通过将鼓风扇120的转速变更为第二转速，在导入管道114的入口端部114a的部分中产生的噪音的峰值频率发生变化。变化后的峰值频率与变更后的第二共鸣频率一致。由此，峰值频率、其附近的频率被抵消，噪音被降低。
控制部301判定是否能结束烘干(S8)。例如，控制部301基于通过第一温度传感器141检测出的出口温度和通过第二温度传感器142检测出的入口温度来判定滚筒23内的衣物的烘干率，在达到能视为衣物已充分烘干的规定的烘干率(例如，100％)时判定为能结束烘干。
通过第一温度传感器141检测出的出口温度，即从外桶20内排出的热风的 温度在滚筒23内的衣物充分含有水分，并且该水分与热风之间进行充分的热交换的期间，呈大致恒定的温度。之后，随着衣物的烘干而所含的水分减少，在该水分与热风之间难以进行热交换时滚筒出口温度开始上升。另一方面，通过第二温度传感器142检测出的入口温度，即向外桶20内导入的热风的温度比出口温度高，呈大致恒定的温度。因此，在衣物的烘干进行到一定程度后，随着衣物的烘干率变高，入口温度与出口温度的温度差变小。
达到规定的烘干率时的入口温度与出口温度的温度差通过进行预先实验等求出，并设定为用于判定烘干结束的规定值。当入口温度与出口温度的温度差达到规定值时，控制部301判定为达到了规定的烘干率，因此能结束烘干。
需要说明的是，也可以是，在鼓风扇120和加热器132开始工作后经过了规定的烘干时间时，控制部301判定为能结束烘干。
当控制部301判定为能结束烘干时(S8：是)，使滚筒23、压缩机133以及鼓风扇120停止(S9)。由此，烘干过程结束。
当烘干过程结束时，控制部301使移动马达260逆转第二旋转角度，使闭塞构件230向基准位置返回。
需要说明的是，将亥姆霍兹共鸣器210的共鸣频率f设定为第一共鸣频率的定时不限于起动鼓风扇120之前，也可以是起动鼓风扇120之后。而且，将亥姆霍兹共鸣器210的共鸣频率f变更为第二共鸣频率的定时不限于使鼓风扇120的转速上升至第二转速之后，也可以在循环风适当地升温后，并且使鼓风扇120的转速上升至第二转速之前。
而且，烘干过程结束后，闭塞构件230也可以不向基准位置返回，而将闭塞构件230停留在与第二共鸣频率对应的位置。在该情况下，在下次的烘干过程中，将亥姆霍兹共鸣器210的共鸣频率f设定为第一共鸣频率时，控制部301求出第一旋转角度与第二旋转角度之间的差分的旋转角度，并使移动马达260正转或逆转该差分的旋转角度。由此，闭塞构件230以使开口面积S变成与第一共鸣频率对应的开口面积S的方式闭塞头部212的开口212a的一部分。
＜实施方式的效果＞
根据本实施方式，洗干一体机1具备：降音装置200，配置于循环风路110 附近，用于降低循环风路110中产生的声音；以及控制部301。降音装置200包括：亥姆霍兹共鸣器210；以及变更机构220，变更亥姆霍兹共鸣器210的共鸣频率f。控制部301控制变更机构220，使得共鸣频率f根据鼓风扇120的转速而变更。
根据该构成，即使在循环风路110中产生的声音的频谱通过鼓风扇120的转速的变化而变化，也能与此相应地变更亥姆霍兹共鸣器210的共鸣频率f。由此，能利用亥姆霍兹共鸣器210来有效地降低烘干过程中来自循环风路110的噪音。
而且，根据本实施方式，亥姆霍兹共鸣器210包括：空洞的腔体部211；以及筒状的头部212，从腔体部211延伸，头部212的开口212a与循环风路110的内部相连。然后，变更机构220变更头部212的开口面积S。
根据该构成，通过变更亥姆霍兹共鸣器210的头部212的开口面积S，能变更共鸣频率f。
而且，根据本实施方式，变更机构220包括：闭塞构件230，闭塞头部212的开口212a；以及移动装置240，以开口面积S变化的方式使闭塞构件230移动，控制部301控制移动装置240。
根据该构成，通过由闭塞构件230使头部212的开口212a的闭塞量变化，能使头部212的开口面积S变化，其结果是，能使亥姆霍兹共鸣器210的共鸣频率f变化。而且，亥姆霍兹共鸣器210不是能使腔体部211、头部212伸缩的构成，因此成为简单的构成。
而且，根据本实施方式，控制部301在烘干过程中使鼓风扇120在以第一转速旋转后以比第一转速高的第二转速旋转，控制部301以如下方式控制变更机构220：在鼓风扇120以第一转速旋转时，亥姆霍兹共鸣器210具有与第一转速对应的第一共鸣频率，在鼓风扇120以第二转速旋转时，亥姆霍兹共鸣器210具有与第二转速对应的第二共鸣频率。能使第一共鸣频率与在第一转速时循环风路110中产生的声音的峰值频率一致(包括大致一致)，能使第二共鸣频率与在第二转速时循环风路110中产生的声音的峰值频率一致(包括大致一致)。
根据该构成，在烘干过程中，在进行在循环风路110与外桶20之间循环的 风是冷风的期间使鼓风扇120以第一转速旋转，风适当地升温后使鼓风扇120以第二转速旋转这样的控制的情况下，能可靠地降低第一转速下的来自循环风路110的噪音和第二转速下的来自循环风路110的噪音。
以上，对本发明的实施方式进行了说明，但本发明并不受上述实施方式等的任何限制，此外，本发明的实施方式还可以在上述内容以外进行各种变更。
＜变更例1＞
图8的(a)和(b)是变更例1的降音装置400的侧视图。图9是变更例1的降音装置400的主视图。图8中，(a)表示亥姆霍兹共鸣器410的头部412伸展最长的状态的降音装置400，(b)表示亥姆霍兹共鸣器410的头部412收缩最短的状态的降音装置400。
在洗干一体机1中，在循环风路110附近，能配置本变更例的降音装置400以代替上述实施方式的降音装置200。
降音装置400具备亥姆霍兹共鸣器410和变更机构420。
亥姆霍兹共鸣器410包括：空洞的腔体部411；以及头部412，从腔体部411延伸。腔体部411具有大致圆柱的箱状。头部412由与腔体部411一体形成的圆筒状的第一筒部412a和嵌入第一筒部412a的外周的圆筒状的第二筒部412b构成。第一筒部412a能相对于第二筒部412b在第一筒部412a的轴线方向上移动。通过第一筒部412a相对于第二筒部412b移动，头部412能以头部412的长度L变化的方式伸缩。头部412的内部与腔体部411的内部相连。
头部412的第二筒部412b连接于循环风路110的导入管道114。由此，头部412的开口412c与循环风路110的内部相连，亥姆霍兹共鸣器410的内部与循环风路110的内部相连。
变更机构420通过变更头部212的长度L来变更亥姆霍兹共鸣器410的共鸣频率f。可伸缩的头部412包含在变更机构420中。而且，变更机构420包括使头部412伸缩的伸缩装置430。
伸缩装置430包括：伸缩马达440，作为用于使第二筒部412b移动而使头部412伸缩的动力源；以及齿条齿轮机构450，将伸缩马达440的旋转运动转换为直线运动并传递至腔体部411。
伸缩马达440为步进马达，配置于腔体部411的下方。伸缩马达440通过第二马达驱动部311驱动。齿条齿轮机构450由齿条451和齿轮452构成。齿条451以沿腔体部411和第一筒部412a的移动方向即前后方向延伸的方式设于腔体部411的外周面的下侧。齿轮452固定于伸缩马达440的旋转轴441，并且与齿条451啮合。
伸缩马达440经由马达用托架(未图示)固定于外壳113的下面。
如图8的(a)所示，当腔体部411位于离第二筒部412b最远的位置时，亥姆霍兹共鸣器410的头部412的长度L变得最长。当伸缩马达440和齿轮452从该状态正转(在正面观察伸缩马达440以顺时针旋转)时，腔体部411以接近第二筒部412b的方式移动，第一筒部412a以该第一筒部412a与第二筒部412b的重叠量变多的方式移动。由此，如图8的(b)所示，头部212的长度L变短。
例如，将头部412的长度L变得最长的腔体部411和第一筒部412a的位置设为基准位置。通过未图示的位置传感器来检测腔体部411和第一筒部412a位于基准位置。
亥姆霍兹共鸣器410的共鸣频率f随着头部412的长度L增大而变小。头部212的长度L能由从基准位置起的腔体部411和第一筒部412a的移动量，即与该移动量相当的从基准位置起的伸缩马达440的旋转角度来规定。
在本变更例中，利用上述的共鸣频率f的运算式求出亥姆霍兹共鸣器410的共鸣频率f达到第一共鸣频率的头部412的长度L。然后，在腔体部411和第一筒部412a位于使头部412的长度L变成所求出的头部412的长度L的位置时的、从基准位置起的伸缩马达440的旋转角度被设定为与第一共鸣频率，即第一转速对应的第一旋转角度。通过同样的方法，设定与第二共鸣频率，即第二转速对应的第二旋转角度。这些第一旋转角度和第二旋转角度存储于存储部302。
在本变更例中，与上述实施方式同样，控制部301执行图7所示的用于烘干过程的控制处理。在步骤S1中，控制部301控制变更机构420(伸缩装置430)，在将亥姆霍兹共鸣器410的共鸣频率f设定为第一共鸣频率时，使伸缩马达440从基准位置正转第一旋转角度。由此，位于基准位置的腔体部411和第一筒部 412a移动至头部412的长度L变成与第一共鸣频率对应的长度的位置。
而且，在步骤S7中，控制部301将亥姆霍兹共鸣器410的共鸣频率f变更为第二共鸣频率时，求出第二旋转角度与第一旋转角度之间的差分的旋转角度，使伸缩马达440正转或逆转差分的旋转角度。由此，腔体部411和第一筒部412a移动至头部412的长度L变成与第二共鸣频率对应的长度的位置。
以上，根据本变更例的构成，通过变更亥姆霍兹共鸣器410的头部412的长度L，能变更共鸣频率f。
而且，根据本变更例的构成，通过使头部412伸缩，能使头部412的长度L变化，其结果是，能使亥姆霍兹共鸣器410的共鸣频率f变化。
＜变更例2＞
图10中，(a)和(b)是变更例2的降音装置500的侧视图，(c)是变更例2的降音装置500的主视图。图10的(a)示出了亥姆霍兹共鸣器510的腔体部511伸展最长的状态的降音装置500，图10的(b)示出了亥姆霍兹共鸣器510的腔体部511收缩最短的状态的降音装置500。
在洗干一体机1中，在循环风路110附近，能配置本变更例的降音装置500以代替上述实施方式的降音装置200。
降音装置500具备亥姆霍兹共鸣器510和变更机构520。
亥姆霍兹共鸣器510包括空洞的腔体部511；以及头部512，从腔体部511延伸。腔体部511具有在前筒部511a与后筒部511b之间设有波纹部511c的大致圆柱的箱状。腔体部511至少波纹部511c由弹性材料形成。腔体部511通过波纹部511c伸缩，能以其体积V变化的方式伸缩。头部512具有圆筒状，与前筒部511a一体形成。头部512的内部与腔体部511的内部相连。
头部512连接于循环风路110的导入管道114。由此，头部512的开口512a与循环风路110的内部相连，亥姆霍兹共鸣器510的内部与循环风路110的内部相连。
变更机构520通过变更腔体部511的体积V来变更亥姆霍兹共鸣器510的共鸣频率f。可伸缩的腔体部511包括在变更机构520中。而且，变更机构520 包括使腔体部511伸缩的伸缩装置530。
伸缩装置530包括：伸缩马达540，作为用于使腔体部511伸缩的动力源；以及凸轮550，呈椭圆形的板状。
伸缩马达540为步进马达，配置于腔体部511的后方。伸缩马达540由第二马达驱动部311驱动。凸轮550固定于伸缩马达540的旋转轴541，并且与腔体部511的后筒部511b接触。
亥姆霍兹共鸣器510的腔体部511的前筒部511a经由共鸣器用托架(未图示)固定于循环风路110的外壳113的下面。伸缩马达540经由马达用托架(未图示)固定于外壳113的下面。
如图10的(a)所示，当波纹部511c处于自然长度的状态，凸轮550处于在上下方向上长的状态时，腔体部511变得最长，腔体部511的体积V变得最大。当伸缩马达540和凸轮550从该状态进行旋转，凸轮550变成在前后方向上长的状态时，腔体部511的后筒部511b被凸轮550向前方推压，波纹部511c收缩。由此，如图10的(b)所示，腔体部511变短，腔体部511的体积V变小。此时，在波纹部511c上产生沿该波纹部511c伸展的方向上弹力。
例如，将处于在上下方向上长的状态时的凸轮550的位置设为基准位置。通过未图示的位置传感器来检测凸轮550位于基准位置。
亥姆霍兹共鸣器510的共鸣频率f随着腔体部511的体积V增大而变小。腔体部511的体积V能由从基准位置起的凸轮550的旋转角度，即伸缩马达440的旋转角度来规定。
在本变更例中，利用上述的共鸣频率f的运算式求出亥姆霍兹共鸣器510的共鸣频率f达到第一共鸣频率的腔体部511的体积V。然后，在腔体部511伸缩使得体积V变成所求出的体积V时的、从基准位置起的伸缩马达540的旋转角度被被设定为与第一共鸣频率，即第一转速对应的第一旋转角度。通过同样的方法，设定与第二共鸣频率，即第二转速对应的第二旋转角度。这些第一旋转角度和第二旋转角度存储于存储部302。
在本变更例中，与上述实施方式同样，控制部301执行图7所示的用于烘干过程的控制处理。在步骤S1中，控制部301控制变更机构520(伸缩装置530)， 在将亥姆霍兹共鸣器510的共鸣频率f设定为第一共鸣频率时，使伸缩马达540从基准位置正转第一旋转角度。由此，以变成与第一共鸣频率对应的体积V的方式使腔体部511的长度变化。
而且，在步骤S7中，控制部301将亥姆霍兹共鸣器510的共鸣频率f变更为第二共鸣频率时，求出第二旋转角度与第一旋转角度之间的差分的旋转角度，使伸缩马达540正转或逆转差分的旋转角度。由此，以变成与第二共鸣频率对应的体积V的方式使腔体部511的长度变化。
以上，根据本变更例的构成，通过变更亥姆霍兹共鸣器510的腔体部511的体积V，能变更共鸣频率f。
而且，根据本变更例的构成，通过使腔体部511伸缩，能使腔体部511的体积V变化，其结果是，能使亥姆霍兹共鸣器510的共鸣频率f变化。
＜其他的变更例＞
在上述实施方式中，洗干一体机1也可以具备将含有银离子等有抗菌效果的成分的雾向滚筒23内喷雾的喷雾装置。在该情况下，在烘干过程中，将雾从喷雾装置向烘干的洗涤物喷雾时，鼓风扇120的转速从第二转速降低至比该第二转速低的第三转速。此时，在降音装置200中，通过控制部301可以将亥姆霍兹共鸣器210的共鸣频率f设定为能抵消在鼓风扇120以第三转速旋转时循环风路110中产生的声音的峰值频率等的第三共鸣频率。需要说明的是，第三转速也可以是与第一转速相同的转速，在该情况下，第三共鸣频率为与第一共鸣频率相同的频率。
进而，在上述实施方式中，在循环风路110中，产生最大噪音的部分，例如在导入管道114的入口端部114a附近配置有降音装置200。然而，也可以是，在循环风路110中，在产生大的噪音的多个部分附近分别配置降音装置200。
进而，在上述实施方式和上述变更例1、变更例2中，利用共鸣频率f的运算式求出亥姆霍兹共鸣器210、410、510的共鸣频率f达到第一共鸣频率和第二共鸣频率的头部212的开口面积S、头部412的长度L以及腔体部511的体积V。然而，可以在预先试验等中进行开口面积S、头部412的长度L、腔体部511的体积V的调整，将实际上在第一转速、第二转速下的峰值频率的声压降低时的 开口面积S、头部412的长度L、腔体部511的体积V决定为共鸣频率f变成第一共鸣频率、第二共鸣频率的头部212的开口面积S、头部412的长度L、腔体部511的体积V。
进而，在上述变更例1中，亥姆霍兹共鸣器410具备通过使嵌入至第一筒部412a的外周的第二筒部412b移动而能伸缩的头部412。然而，在亥姆霍兹共鸣器410中，也可以采用如下构成：与上述变更例2的使亥姆霍兹共鸣器510的腔体部511伸缩的构成同样，通过设置波纹部而使头部412能伸缩。
进而，变更亥姆霍兹共鸣器410的头部412的长度L的变更机构的构成不限于上述变更例1的构成。头部412不一定为直线状，也可以弯曲。因此，例如，也可以在变更机构中采用与变更活塞阀式小号中的管的长度的方式相同的方式。在该情况下，可以通过适当的致动器驱动活塞阀。而且，变更机构也可以采用与变更转阀式小号中的管的长度的方式相同的方式。在该情况下，可以通过适当的致动器驱动转阀。
进而，在上述变更例2中，亥姆霍兹共鸣器510具备通过设置波纹部511c而能伸缩的腔体部511。然而，亥姆霍兹共鸣器510也可以具备与上述变更例1的使亥姆霍兹共鸣器410的头部412伸缩的构成同样，具有头部的前筒部和后筒部在前后方向上叠合，通过改变其重叠量而能伸缩的腔体部。在该情况下，伸缩装置为了使前筒部和后筒部中的一方移动，可以由齿条齿轮机构和伸缩马达构成。
进而，在上述变更例2中，亥姆霍兹共鸣器510的腔体部511能在头部512延伸的方向上伸缩。然而，腔体部511也可以在与头部512延伸的方向垂直的方向上伸缩。
进而，在洗干一体机1中，在循环风路110附近，也可以配置具备能变更亥姆霍兹共鸣器的头部的开口面积S、头部的长度L以及腔体部的体积V中的两个或全部的变更机构的减压装置。在该情况下，在变更机构中，能适当组合上述实施方式、上述变更例1、变更例2所示的构成。
进而，在上述实施方式中，烘干装置100配置于箱体10内的上部。然而，烘干装置100也可以配置于箱体10内的下部。
进而，在上述实施方式中，洗干一体机1是具备横轴型滚筒23的滚筒式洗干一体机。然而，本发明也可以适用于在外桶内具备具有波轮的纵轴型的洗涤脱水桶来作为内桶的所谓立式洗干一体机。
此外，本发明的实施方式可以在权利要求书所示的技术思想的范围内适当地进行各种变更。

Claims (6)

  1. 一种洗干一体机，其特征在于，具备：
    外桶，配置于箱体内；
    内桶，能旋转地配置于所述外桶内，容纳洗涤物；
    循环风路，连接于所述外桶；
    鼓风扇，使空气在所述外桶与所述循环风路之间循环；
    加热器，对流过所述循环风路的空气进行加热；
    降音装置，配置于所述循环风路附近，用于降低所述循环风路中产生的声音；以及
    控制部，
    所述降音装置包括：
    亥姆霍兹共鸣器；以及
    变更机构，用于变更所述亥姆霍兹共鸣器的共鸣频率，
    所述控制部控制所述变更机构，使得所述共鸣频率根据所述鼓风扇的转速而变更。
  2. 根据权利要求1所述的洗干一体机，其特征在于，
    所述亥姆霍兹共鸣器包括：
    空洞的腔体部；以及
    筒状的头部，从所述腔体部延伸，
    所述头部的开口与所述循环风路的内部相连，
    所述变更机构变更所述头部的开口面积、所述头部的长度或者所述腔体部的体积。
  3. 根据权利要求2所述的洗干一体机，其特征在于，
    所述变更机构包括：
    闭塞构件，闭塞所述头部的开口；以及
    移动装置，以使所述开口面积变化的方式使所述闭塞构件移动，
    所述控制部控制所述移动装置。
  4. 根据权利要求2所述的洗干一体机，其特征在于，
    所述变更机构包括：
    所述头部，能以长度变化的方式伸缩；以及
    伸缩装置，使所述头部伸缩，
    所述控制部控制所述伸缩装置。
  5. 根据权利要求2所述的洗干一体机，其特征在于，
    所述变更机构包括：
    所述腔体部，能以体积变化的方式伸缩；以及
    伸缩装置，使所述腔体部伸缩，
    所述控制部控制所述伸缩装置。
  6. 根据权利要求1至5中任一项所述的洗干一体机，其特征在于，
    所述控制部在烘干过程中使所述鼓风扇在以第一转速旋转后以比所述第一转速高的第二转速旋转，
    所述控制部以如下方式控制所述变更机构：在所述鼓风扇以所述第一转速旋转时，所述亥姆霍兹共鸣器具有与所述第一转速对应的第一共鸣频率，在所述鼓风扇以所述第二转速旋转时，所述亥姆霍兹共鸣器具有与所述第二转速对应的第二共鸣频率。
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