JP5010571B2 - Washing and drying machine - Google Patents

Description

  The present invention relates to a washing / drying machine including a circulation fan that circulates air in a water tank and a compressor that constitutes a heat pump.

  A washing / drying machine equipped with a heat pump for drying laundry is attracting attention as it has good drying performance and is effective in saving energy. This heat pump has a configuration in which an evaporator and a condenser disposed in a circulation air passage connected to a water tank, and a compressor and a throttle valve are connected in a cycle. In the washer / dryer provided with such a heat pump, the air in the water tank is circulated through the circulation air passage by the circulation fan. At this time, the air circulating in the circulation air passage is cooled and dehumidified by the evaporator, heated by the condenser, and sequentially fed into the water tank, and the air deprived of moisture from the laundry is returned to the circulation air passage. By repeating such air circulation, the laundry is gradually dried.

In the washer / dryer provided with such a heat pump, the circulation fan and the compressor are disposed in close proximity to each other in a relatively small space in the casing of the washer / dryer. Therefore, when the circulation fan and the compressor are driven, if the operation frequency of the circulation fan and the operation frequency of the compressor are close to each other, beats are generated in association with this, and some users may feel uncomfortable hearing. is there.
Here, for example, the washing / drying machine described in Patent Document 1 is configured such that the operation frequency (operation speed) of the circulation fan during the drying process is separated from the operation frequency of the compressor by at least 10 Hz or more. Occurrence of beats associated with the proximity of the operating frequency of the compressor is avoided.
JP 2008-104478 A

  The washing / drying machine of Patent Document 1 avoids the occurrence of beat in each process in the drying process, particularly in a process after the circulation fan and the compressor reach a steady frequency. However, in the process from the start of the circulation fan and the compressor until the circulation fan and the compressor reach a steady frequency, no control is performed to avoid the occurrence of beat.

  Here, since the process until the circulation fan and the compressor reach the steady frequency is a transient process at the time of starting, there is a possibility that special control for avoiding the occurrence of beat is unnecessary. However, in the process until the circulation fan and the compressor reach the steady frequency, for example, the circulation fan reaches the steady frequency first, and then the change in the operation frequency of the compressor increases across the steady frequency of the circulation fan. May be. In this case, the operation frequency of the circulation fan and the operation frequency of the compressor are very close to each other, and there may be a situation in which the occurrence of the beat cannot be ignored from the user's perspective. Such a beat in the process until the circulation fan and the compressor reach a steady frequency occurs particularly when the operation frequency imbalance of the circulation fan and the compressor is large.

  The present invention has been made in view of the above circumstances, and its purpose is that the operation frequency of the circulation fan and the operation frequency of the compressor are close to each other in the process until the circulation fan and the compressor reach a steady frequency. An object of the present invention is to provide a washing / drying machine capable of reducing the occurrence of accompanying beats.

  In order to achieve the above-described object, a washing and drying machine of the present invention includes a water tank, a drum rotatably provided in the water tank, a circulation air passage connected to the water tank, and a laundry in the drum. A circulation fan that circulates air into the water tank through the circulation air passage when drying things, an evaporator that cools and dehumidifies the air circulated in the circulation air passage, and heats the air circulated in the circulation air passage A heat pump that configures a refrigeration cycle by connecting a condenser that compresses the refrigerant to be supplied to the condenser, and a decompression unit that decompresses the refrigerant discharged from the condenser, the circulation fan, and When the operation frequency of one of the circulation fan and the compressor changes so as to cross the other operation frequency in the process until the compressor reaches a steady frequency, the operation of the circulation fan is performed. Characterized in that the operating frequency of the frequency and the compressor and a control means for controlling one of the operating frequency to shorten the time to close.

  According to the washing and drying machine of the present invention, in the process until the circulation fan and the compressor reach a steady frequency, when one of the circulation fan and the compressor changes so as to cross the other operation frequency, One operation frequency is controlled so that the time for which the operation frequency of the circulation fan and the operation frequency of the compressor are close to each other is shortened. Thereby, in the process until the circulation fan and the compressor reach the steady frequency, it is possible to reduce the occurrence of beats caused by the operation frequency of the circulation fan and the operation frequency of the compressor being close to each other.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 2 shows the overall structure of a washing / drying machine, in particular, a drum-type washing / drying machine. A water tank 2 is disposed inside the casing 1, and a drum 3 is disposed as a rotating tank inside the water tank 2. is doing.
Both the water tank 2 and the drum 3 are cylindrical, and the axial direction thereof is the front-rear direction (left-right direction in FIG. 2), and the openings 4, 5 are provided on the front end face (left side in FIG. 2). Have. Among these, the opening 5 of the drum 3 is for putting in and out the laundry (clothing), and the opening 4 of the water tank 2 surrounds it. In addition, the opening 4 of the water tank 2 is connected to the opening 6 for taking in and out the laundry formed on the front surface of the housing 1 by a bellows 7 so that the door 8 can be opened and closed at the opening 6 of the housing 1. Provided.

  In the water tank 2, a hot air outlet 9 is formed in the upper part of the front end face part (a part above the opening 4), and a hot air inlet 10 is formed in the upper part of the rear end face part. In addition, a drain port 11 is formed at the bottom of the bottom of the water tank 2, a drain valve 12 is connected to the drain port 11 outside the water tank 2, and a drain hose 13 is connected to the drain valve 12. Thus, a drainage device 14 for discharging the water in the water tank 2 to the outside of the apparatus is configured.

  A washing machine motor 15 is attached to the back surface of the water tank 2, and the rotation shaft 15 a is inserted into the water tank 2, and the center part of the rear end surface part of the drum 3 is attached to the front end part thereof. . Thereby, the drum 3 is coaxially supported by the water tank 2 so that rotation is possible. The aquarium 2 is elastically supported by the housing 1 by a plurality of suspensions 16 (only one is shown). The supporting form is a horizontal axis in which the axial direction of the aquarium 2 is the front-rear direction, and the front It is a rising slope. Accordingly, the drum 3 supported in the water tank 2 as described above has the same form.

In this case, the washing machine motor 15 is an outer rotor type, and is a thin brushless DC motor, and functions as a driving device for rotating the drum 3.
A base plate 17 is disposed below the water tank 2 (on the bottom surface of the housing 1), and a heat exchange duct 18 is disposed on the base plate 17. This heat exchange duct 18 has an air inlet 19 at the upper part of the front end, and the hot air outlet 9 of the water tank 2 is connected to the air inlet 19 via a return air duct 20 and a connection hose 21. . The return air duct 20 is piped so as to bypass the left side of the opening 4 of the water tank 2.

  On the other hand, a casing 23 of the circulation fan 22 is connected to the rear end portion of the heat exchange duct 18, and an outlet 24 of the casing 23 is connected to the temperature of the water tank 2 via a connection hose 25 and an air supply duct 26. It is connected to the wind inlet 10. The air supply duct 26 is piped so as to bypass the left side of the washing machine motor 15.

As a result, the return air duct 20, the connection hose 21, the heat exchange duct 18, the casing 23, the connection hose 25, and the air supply duct 26 connect the hot air outlet 9 and the hot air inlet 10 of the water tank 2 to circulate the wind. A path 27 is provided.
In this case, the circulation fan 22 is a centrifugal fan, has a centrifugal impeller 28 inside the casing 23, and has a circulation fan motor 29 for rotating the centrifugal impeller 28 outside the casing 23. Yes.

  In the circulation air passage 27, the evaporator 30 is arranged at the front part and the condenser 31 is arranged at the rear part inside the heat exchange duct 18. The evaporator 30 and the condenser 31 are not shown in detail, but they are tube-shaped with fins in which a large number of heat transfer fins are arranged on the refrigerant distribution pipe at a fine pitch, and are excellent in heat exchange. The air flowing through the heat exchange duct 18 as described later passes between the heat transfer fins.

  As shown in FIG. 3, the evaporator 30 and the condenser 31 include a compressor 32 that compresses the refrigerant supplied to the condenser 31, and a throttle valve 33 (a decompression unit that decompresses the refrigerant discharged from the condenser 31. In particular, the heat pump 34 is configured together with an electronic throttle valve). In the heat pump 34, the compressor 32, the condenser 31, the throttle valve 33, and the evaporator 30 are connected in this order by a connection pipe 35 to constitute a refrigeration cycle. The refrigerant is circulated by operating the compressor 32.

  More specifically, the refrigerant sealed in the heat pump 34 is compressed by the compressor 32 to become a high-temperature and high-pressure refrigerant, and the high-temperature and high-pressure refrigerant flows into the condenser 31 and is condensed to dissipate heat. As a result, the air in the circulation air passage 27 (heat exchange duct 18) is heated, and conversely, the temperature of the refrigerant is lowered and liquefied. The liquefied refrigerant then passes through the throttle valve 33 and is depressurized, and then flows into the evaporator 30 and vaporizes. Thereby, the evaporator 30 cools and dehumidifies the air in the circulation air path 27 (heat exchange duct 18). The refrigerant that has passed through the evaporator 30 returns to the compressor 32.

  When the circulation fan motor 29 is operated, the air in the water tank 2 is connected to the return air duct 20 and the connection of the circulation air passage 27 from the hot air outlet 9 as shown by arrows in FIG. It flows into the heat exchange duct 18 through the hose 21. The air that has flowed into the heat exchange duct 18 is cooled by the evaporator 30 and dehumidified, and then heated by the condenser 31 to warm air. Then, the hot air is supplied from the hot air inlet 10 into the water tank 2 through the connection hose 25 and the air supply duct 26. Thus, the evaporator 30 functions as a dehumidifier, and the condenser 31 functions as a heater. The evaporator 30 and the condenser 31, the circulation air passage 27 and the circulation fan 22, thereby the inside of the water tank 2. A hot air supply device 36 is configured to supply hot air.

  On the other hand, the drum 3 has a warm air inlet 37 formed in the rear end surface portion 3a, and the hot air inlet 37 is arranged in an annular arrangement concentric with the center of the rear end surface portion of the drum 3. And each one of them faces the hot air inlet 10 of the water tank 2 by the rotation of the drum 3. Accordingly, the hot air supplied to the inside of the water tank 2 as described above is supplied to the inside of the drum 3 from each of the hot air introduction ports 37.

A large number of holes 38 for dehydration and ventilation are provided in the drum section 3b in almost the entire region. Further, a plurality of (for example, about three) baffles 39 for stirring the laundry are provided on the inner peripheral surface of the drum portion 3b of the drum 3 with substantially equal intervals. In addition, a liquid-filled rotary balancer 40 is provided on the entire inner periphery of the front end surface portion 3 c of the drum 3.
A power supply system control unit 41 and a display system control unit 42 necessary for controlling the washing / drying machine are provided in the upper part of the housing 1. In addition, a water supply valve 43 for supplying water into the water tank 2, a water supply case 44, and a water supply hose 45 are disposed in the upper part of the housing 1, and a water supply device 46 is configured.

  FIG. 4 shows a control device 47 (corresponding to control means). The control device 47 includes a power supply control unit 41 and a display control unit 42, and is mainly composed of a microcomputer and has a function of controlling the overall operation of the washing and drying machine. Therefore, the control device 47 includes various operation signals from the operation input unit 48 including various operation switches (not shown) of the operation panel, and a water level detection signal from the water level sensor 49 that detects the water level in the water tank 2. A rotation detection signal from a rotation sensor 50 that detects the rotation speed of the drum 3 is input. Further, the rotation detection signal from the rotation sensor 51 that detects the rotation speed of the circulation fan 22 and the rotation detection signal from the rotation sensor 52 that detects the rotation speed of the compressor 32 are input to the control device 47. It has become so.

  The control device 47 controls the water supply valve 43, the washing machine motor 15, the drain valve 12, the compressor 32, the throttle valve 33, and the circulation fan motor 29 based on the various input signals and the control program stored in advance. Control is performed via a drive circuit 53.

Next, the operation of the present embodiment will be described with reference to FIG.
In the laundry dryer having the above-described configuration, when the standard operation course is started, the control device 47 first starts the washing process (washing and rinsing). In this washing process, an operation of supplying water into the water tub 2 is performed by the water supply valve 43, and then the washing machine motor 15 is operated, whereby the drum 3 is alternately rotated in both forward and reverse directions at a low speed.
When the washing process ends, the control device 47 proceeds to the dehydration process. In this dehydration process, after the water in the water tank 2 is discharged, the drum 3 is rotated in one direction at a high speed. Thereby, the laundry in the drum 3 is centrifugally dehydrated.

  When the dehydration process is completed, the control device 47 proceeds to the drying process. In this drying process, the controller 47 starts the circulation fan 22 and the compressor 32 of the heat pump 34 while rotating the drum 3 in both forward and reverse directions at a low speed by the washing machine motor 15. At this time, as shown in FIG. 1, the operation frequency Fj of the circulation fan 22 reaches the steady frequency Fjt at the beginning of the drying process because the circulation fan 22 is easily started, and then the operation frequency Fj of the circulation fan 22. Is maintained at a substantially constant frequency (steady frequency Fjt) in the drying process. And the air in the water tank 2 is circulated through the circulation air path 27 by the ventilation effect | action of the circulation fan 22 operated in this way (refer the solid line arrow in FIG.2 and FIG.3). In addition, the steady frequency Fjt of the circulation fan 22 is 75 Hz in this case, and is 4500 rpm when converted into a rotation speed.

  On the other hand, the operating frequency Fc of the compressor 32 of the heat pump 34 crosses the steady frequency Fjt of the circulation fan 22 that is maintained almost constant from the beginning of the drying process because the compressor 32 is less likely to start than the circulation fan 22. In this way, it gradually rises and eventually reaches the steady frequency Fct of the compressor 32 (see the change indicated by the one-dot chain line in FIG. 1). In this case, the changing speed (rising speed) of the operating frequency Fc of the compressor 32 is 0.6 Hz / sec. In addition, the steady frequency Fct of the compressor 32 is 100 Hz in this case, and is 6000 rpm when converted into a rotation speed.

  Here, as the operation frequency Fc of the compressor 32 gradually increases, the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 are close to each other, and the frequency difference between them is a predetermined value a (for example, 10 Hz) or less, beats occur, and some users may feel uncomfortable hearing.

  Therefore, when the frequency difference between the operating frequency Fj of the circulation fan 22 and the operating frequency Fc of the compressor 32 becomes equal to or less than the predetermined value a, the control device 47 temporarily changes the changing speed (rising speed) of the operating frequency Fc of the compressor 32. (Control means). That is, the control device 47 increases the increasing speed of the operating frequency Fc of the compressor 32 from 0.6 Hz / sec to 1.2 Hz / sec in this case. The operating frequency Fc of the compressor 32 exceeds the steady frequency Fjt of the circulation fan 22, and the frequency difference between the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 is equal to or greater than a predetermined value b (for example, 12 Hz). Then, the control device 47 returns the rising speed of the operating frequency Fc of the compressor 32 to the original speed (0.6 Hz / sec).

  Note that the predetermined value a varies depending on individual differences and the like, and is preferably set to about 0 to 12 Hz. The predetermined value b is preferably set to be equal to or higher than the predetermined value a, but may be set to, for example, 8 Hz, that is, the predetermined value a or lower when the level of the beat sound is small. In this case, the time T from when the operating frequency Fc of the compressor 32 is increased to the original speed is increased to about 20 seconds.

  Thereafter, the compressor 32 reaches the steady frequency Fct and continues to be driven. In other words, the circulation fan 22 and the compressor 32 are both driven at their respective steady frequencies Fjt and Fct, and the air in the water tank 2 is circulated through the circulation air passage 27 and enclosed in the heat pump 34. The refrigerant thus circulated through the condenser 31, the throttle valve 33, and the evaporator 30 in this order. The circulated air is dehumidified by the evaporator 30 and heated by the condenser 31. Thereby, warm air is supplied to the inside of the water tank 2 and the laundry is dried.

  As described above, according to the present embodiment, the operation frequency Fc of the compressor 32 is changed to the operation frequency Fj of the circulation fan 22 until the circulation fan 22 and the compressor 32 reach the respective steady frequencies Fjt and Fct. The controller 47 temporarily increases the operating frequency Fc of the compressor 32 so that the operating frequency Fj of the circulation fan 22 and the operating frequency Fc of the compressor 32 are close to each other. To shorten the time. As a result, the range in which the beat occurs can be passed in as short a time as possible, and the operation frequency Fj of the circulation fan 22 and the compression are reduced until the circulation fan 22 and the compressor 32 reach the respective steady frequencies Fjt and Fct. It is possible to reduce the occurrence of beats caused by the proximity of the operating frequency Fc of the machine 32.

  In the drying process, the control device 47 adjusts the operating frequency Fc of the compressor 32 by inverter control. Therefore, as shown in FIG. 5, the operating frequency Fc of the compressor 32 may gradually fall so as to straddle the steady frequency Fjt of the circulation fan 22 (see the change indicated by the alternate long and short dash line in FIG. 5).

  Also in this case, when the frequency difference between the operating frequency Fj of the circulation fan 22 and the operating frequency Fc of the compressor 32 becomes equal to or less than the predetermined value a, the control device 47 changes the operating frequency Fc of the compressor 32 (lowering speed). Is temporarily accelerated (control means). When the frequency difference between the operating frequency Fj of the circulation fan 22 and the operating frequency Fc of the compressor 32 becomes equal to or greater than the predetermined value b, the control device 47 returns the descending speed of the operating frequency Fc of the compressor 32 to the original speed. It is like that.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. In the first embodiment described above, the generation of beat is reduced by controlling the operation frequency Fc of the compressor 32 with respect to the circulation fan 22 driven at the steady frequency Fjt. In contrast, the present embodiment is configured to reduce the occurrence of beat by controlling the operating frequency Fj of the circulation fan 22 with respect to the compressor 32 driven at the steady frequency Fct.

  That is, in the drying process, the control device 47 may adjust the circulation air volume by controlling the operation frequency Fj of the circulation fan 22. Therefore, as shown in FIG. 6, the operating frequency Fj of the circulation fan 22 may gradually increase so as to straddle the steady frequency Fct of the compressor 32 (see the change indicated by the one-dot chain line in FIG. 6).

  Therefore, when the frequency difference between the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 becomes equal to or less than a predetermined value a (for example, 10 Hz), the control device 47 changes the rate of change (increase in the operation frequency Fj of the circulation fan 22). (Speed) is temporarily increased (control means). That is, the control device 47 increases the increasing speed of the operating frequency Fj of the circulation fan 22 from 15 Hz / sec to 30 Hz / sec in this case. When the frequency difference between the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 becomes equal to or greater than a predetermined value b (for example, 12 Hz), the control device 47 uses the rising speed of the operation frequency Fj of the circulation fan 22 as a source. It is supposed to return to speed. In this case, the time T from when the operating frequency Fj of the circulation fan 22 is increased to the original speed is increased to about 20 seconds.

  Although not shown, the controller 47 may gradually lower the operating frequency Fj of the circulation fan 22 across the steady frequency Fct of the compressor 32. Also in this case, when the frequency difference between the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 becomes equal to or less than the predetermined value a, the control device 47 changes the speed (downward speed) of the operation frequency Fj of the circulation fan 22. Is temporarily increased (control means), and when the frequency difference becomes equal to or greater than a predetermined value b, the lowering speed of the operating frequency Fj of the circulation fan 22 is returned to the original speed.

  According to the present embodiment, by temporarily increasing the changing speed of the operating frequency Fj of the circulation fan 22, it is possible to pass the range in which the beat occurs in as short a time as possible, and the operation frequency Fj and compression of the circulation fan 22 are compressed. It is possible to reduce the occurrence of beats caused by the proximity of the operating frequency Fc of the machine 32.

  Moreover, the circulation fan 22 is easy to return to the original speed even if the change speed of the operating frequency Fj is increased compared to the compressor 32 constituting the heat pump 34. Therefore, it is possible to instantaneously perform control for shortening the time in which the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 are close to each other, and it is possible to easily reduce the occurrence of an unpleasant hearing. .

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In the second embodiment described above, the occurrence of beat is reduced by temporarily increasing the changing speed of the operating frequency Fj of the circulation fan 22. On the other hand, the present embodiment is configured to reduce the occurrence of beat by temporarily stopping the driving of the circulation fan 22.

  That is, the control device 47 stops driving the circulation fan 22 when the frequency difference between the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 becomes a predetermined value a (for example, 10 Hz) or less. (Control means). Then, the operating frequency Fc of the compressor 32 exceeds the steady frequency Fjt of the circulation fan 22 (see the portion indicated by the one-dot chain line in FIG. 7), and further, the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 When the frequency difference becomes equal to or greater than a predetermined value b (for example, 12 Hz), the control device 47 starts driving the circulation fan 22 again. In this case, the time T from when the driving of the circulation fan 22 is stopped to when the driving is started again is about 20 seconds or less.

  According to the present embodiment, by temporarily stopping the operation of the operation frequency Fj of the circulation fan 22, it is possible to almost eliminate the time in which the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 are close to each other. In addition, it is possible to avoid the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 from being close to each other, and to reduce the occurrence of beats due to the proximity of the operation frequency.

  Moreover, since the circulation fan 22 is a structure which is easier to start compared with the compressor 32 which comprises the heat pump 34, even if the drive is once stopped, it can return to the steady frequency Fjt rapidly after restarting. Therefore, it is possible to efficiently perform control for eliminating the time in which the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 are close to each other, and it is possible to easily reduce the occurrence of an unpleasant hearing.

  In addition, in this embodiment, it was comprised so that generation | occurrence | production of a beat may be reduced by stopping the drive of the circulation fan 22 temporarily, but instead, by stopping the drive of the compressor 32 temporarily. (Control means) You may comprise so that generation | occurrence | production of a beat may be reduced.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the above-described third embodiment, the driving of the circulation fan 22 is temporarily stopped to reduce the occurrence of beat. In contrast, the present embodiment is configured to reduce the occurrence of beat by temporarily retracting the operation frequency Fj of the circulation fan 22 to an operation frequency different from the steady frequency Fjt.

  That is, as shown in FIG. 8, the control device 47 operates the circulation fan 22 when the frequency difference between the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 becomes a predetermined value a (for example, 10 Hz) or less. The frequency Fj is lowered to an operation frequency Fd lower than the steady frequency Fjt (control means). In this case, the difference between the steady frequency Fjt of the circulation fan 22 and the operating frequency Fd is a value obtained by adding a predetermined value c (for example, 12 Hz) to the predetermined value a. The predetermined value c is set to a value larger than the predetermined value a (predetermined value a ≦ predetermined value c).

  Then, the operating frequency Fc of the compressor 32 exceeds the steady frequency Fjt of the circulation fan 22 (see the portion indicated by the alternate long and short dash line in FIG. 8), and the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 are When the frequency difference becomes equal to or greater than a predetermined value b (for example, 12 Hz), the control device 47 returns the operation frequency Fj of the circulation fan 22 from the operation frequency Fd to the original steady frequency Fjt. The predetermined value b is set to a value larger than the predetermined value a (predetermined value a ≦ predetermined value b). Further, in this case, the time T from when the operating frequency Fj of the circulation fan 22 is retracted to a different operating frequency Fd until it is returned to the steady frequency Fjt is about 20 seconds or less.

  As shown in FIG. 9, the control device 47 operates the operation frequency of the circulation fan 22 when the frequency difference between the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 becomes a predetermined value a or less. Fj may be raised to an operating frequency Fu higher than the steady frequency Fjt (control means). In this case, the difference between the steady frequency Fjt and the operating frequency Fu is a value obtained by adding the predetermined value c to the predetermined value b. The predetermined value c is set to a value larger than the predetermined value a (predetermined value a ≦ predetermined value c).

  According to the present embodiment, the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 are reduced by retracting the operation frequency Fj of the circulation fan 22 to the operation frequency Fd or the operation frequency Fu different from the steady frequency Fjt. Can be almost eliminated, and the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 can be avoided from being close to each other, and the occurrence of the beat caused by the proximity of the operation frequency can be reduced. Can do.

  Further, since the circulation fan 22 has a configuration that is easier to start than the compressor 32 that constitutes the heat pump 34, even if the operation frequency Fj is retreated to a different operation frequency Fd or operation frequency Fu, the steady-state frequency can be quickly obtained. Return to Fjt. Therefore, it is possible to efficiently perform control for eliminating the time in which the operation frequency Fj of the circulation fan 22 and the operation frequency Fc of the compressor 32 are close to each other, and it is possible to easily reduce the occurrence of an unpleasant hearing.

  In the present embodiment, the operation frequency Fj of the circulation fan 22 is configured to be reduced to the operation frequency Fd or the operation frequency Fu different from the steady frequency Fjt, thereby reducing the occurrence of beats. The operation frequency Fc of the compressor 32 may be retreated to an operation frequency different from the steady frequency Fct (control unit), thereby reducing the occurrence of beat.

(Other embodiments)
In addition, this invention is not limited only to each above-mentioned embodiment, It can deform | transform or expand as follows.
The predetermined values a, b, and c vary depending on individual differences and can be appropriately changed and set according to the user and the use environment. In addition, depending on the set predetermined values a, b, and c, values such as time T in a range in which the beat occurs are different.

The steady frequency Fjt of the circulation fan 22 and the steady frequency Fct of the compressor 32 can be appropriately changed and set according to the performance of the circulation fan 22 and the compressor 32 to be used.
The present invention is not limited to a washing / drying machine having both washing and drying functions, and can also be applied to a drying machine having only a drying function.

The 1st Embodiment of this invention is shown, and the figure for demonstrating the control content for reducing generation | occurrence | production of a beat Longitudinal side view showing the outline of the overall structure of the washing and drying machine Cycle diagram of heat pump Electrical configuration block diagram 1 equivalent diagram FIG. 1 equivalent view according to the second embodiment of the present invention. FIG. 1 equivalent view according to the third embodiment of the present invention. FIG. 1 equivalent view according to the fourth embodiment of the present invention. 1 equivalent diagram

Explanation of symbols

  In the drawings, 2 is a water tank, 3 is a drum, 22 is a circulation fan, 27 is a circulation air passage, 30 is an evaporator, 31 is a condenser, 32 is a compressor, 33 is a throttle valve (decompression means), 34 is a heat pump, Reference numeral 47 denotes a control device (control means).

Claims (4)

A tank,
A drum rotatably provided in the water tank;
A circulation air passage connected to the water tank;
A circulation fan for circulating air into the water tank through the circulation air passage when the laundry in the drum is dried;
An evaporator that cools and dehumidifies air circulating in the circulation air passage, a condenser that heats the air circulating in the circulation air passage, a compressor that compresses a refrigerant supplied to the condenser, and the condensation A heat pump constituting a refrigeration cycle by connecting a decompression means for decompressing the refrigerant discharged from the container;
In the process until the circulating fan and the compressor reach a steady frequency, when the operating frequency of one of the circulating fan and the compressor changes to cross the other operating frequency, the operating frequency of the circulating fan And a control means for controlling one operating frequency so as to shorten the time in which the operating frequency of the compressor is close to the operating frequency.   The control means shortens the time in which the operation frequency of the circulation fan and the operation frequency of the compressor are close to each other by temporarily increasing the change speed of the operation frequency of one of the circulation fan and the compressor. The washing / drying machine according to claim 1.   The control means eliminates time in which the operation frequency of the circulation fan and the operation frequency of the compressor are close by temporarily stopping driving of one of the circulation fan and the compressor. The washing / drying machine according to claim 1.   The control means temporarily saves one operating frequency of the circulation fan and the compressor to a different operation frequency, thereby allowing time for the operation frequency of the circulation fan and the operation frequency of the compressor to approach each other. The washing / drying machine according to claim 1, wherein the washing / drying machine is eliminated.

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