JP2011104226A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that high frequency sound which is offensive to the ear is transmitted to the outside of a washing machine outer frame 30 and the a washing machine has an unpleasant operation sound in dewatering during which the rotation speed of a driving means 35 is high. <P>SOLUTION: The washing machine includes: an outer tub 33 supported by resilient bodies 31 provided on the washing machine outer frame 30; a washing and dewatering tub 34 rotatably provided inside the outer tub 33; and transmission means 45 for transmitting the rotation of a motor (driving means) 35 provided on the outer tub 33 to the washing and dewatering tub 34. The transmission means 45 includes: a first pulley 42 provided on the motor 35; a second pulley 43 provided on the washing and dewatering tub 34; and a transmission belt 44 for freely rotatably connecting the first pulley 42 and the second pulley 43. The first pulley 42 is covered with sound shielding means 46 for shielding the sound of a predetermined frequency. Thus, the sound offensive to the ear is shielded and the washing machine with comfortable operation sound is achieved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a laundry for washing, rinsing and dewatering (may be further performed until drying) in a washing and dehydrating tub rotatably disposed in an outer tub elastically supported in the washing machine body. Related to the machine.

  Conventionally, in this type of washing machine, the motor is covered with a sound-insulating member having elasticity, one end of the sound-insulating member is fixed in the vicinity of the motor, and a communication path is provided in the sound-insulating member to communicate the motor and the outside of the washing machine body. This is a configuration (see, for example, Patent Document 1).

  FIG. 9 shows a configuration of a sound insulation member of a conventional washing machine described in Patent Document 1. As shown in FIG. As shown in FIG. 9, the sound insulation member 8 is formed of rubber, resin, or other material, and houses a motor 9 and a cooling fan 10 therein. One end of the sound insulating member 8 is fixed to the rear part of the washing machine body 1 and the other end is fixed to the outer tub 3 in the vicinity of the motor 9. The sound insulating member 8 is provided with a concavo-convex portion 11 so as to have elasticity. The communication path 12 communicates the motor 9 with the outside of the washing machine body 1. The communication path 12 is divided into upper and lower parts by a partition plate 13. Air for cooling the motor 9 flows on the upper side, and air after cooling flows on the lower side to the outside of the washing machine body 1. The rotation of the motor 9 is transmitted to a transmission mechanism (not shown) via the pulley 14 and the belt 15. Washing and dehydration are performed by the rotation of the motor 9, and the motor 9 generates noise, but the sound insulation member 8 can perform sound insulation over almost all surfaces.

JP 61-265191 A

  However, in the conventional configuration, the sound insulation member 8 insulates the noise generated by the motor 9, but the belt drive sound generated by the pulley 14 and the belt 15 is not insulated. Therefore, in the dehydration where the rotational speed of the motor 9 is high, an unpleasant high-frequency sound is transmitted to the outside of the washing machine body 1 and the operation sound of the washing machine becomes uncomfortable.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to realize a washing machine having a comfortable operation sound by insulating a harsh high-frequency sound generated when a pulley and a belt are driven.

  In order to solve the above-mentioned conventional problems, the washing machine of the present invention is provided with a sound insulation means for covering the pulley of the motor, and removing high frequency components of the belt driving sound generated by the pulley and the belt.

  As a result, it is possible to achieve a washing machine that can insulate the annoying sound and has a comfortable operation sound.

  The washing machine of the present invention is provided with a sound insulation means for covering the pulley of the motor, and can remove a high frequency component of the belt driving sound generated by the pulley and the belt, so that an unpleasant sound can be insulated and has a comfortable operation sound. A washing machine can be realized.

1 is a longitudinal sectional view of a washing machine according to Embodiment 1 of the present invention. Rear view of the main part of the washing machine Graph showing frequency analysis of noise of the washing machine The principal part perspective view of the washing machine in Embodiment 2 of this invention The principal part rear view of the washing machine in Embodiment 3 of this invention Sectional drawing of the principal part of the washing machine in Embodiment 4 of this invention Sectional drawing of the principal part of the washing machine in Embodiment 5 of this invention The rear view of the washing machine in Embodiment 6 of this invention Cross section of the main part of a conventional washing machine

  According to a first aspect of the present invention, there is provided an outer tub supported by an elastic body provided on an outer frame of a washing machine, a washing and dehydrating tub provided rotatably in the outer tub, and a driving means provided in the outer tub. Transmission means for transmitting the rotation to the washing and dewatering tub, wherein the transmission means includes a first pulley provided in the driving means, a second pulley provided in the washing and dewatering tub, and the first The pulley and the second pulley are configured to be a transmission belt that rotatably connects the pulley, and the first pulley is covered with sound insulation means for insulating sound of a predetermined frequency. A high-frequency component of the generated belt driving sound can be removed, and a washing machine having a comfortable operation sound without an harsh sound can be realized.

  In the second invention, in particular, the sound insulation means of the first invention is a washing machine provided with a sound insulation covering a part of the opening, thereby reducing the area of the opening. The belt drive sound that leaks can be reduced.

  In particular, the sound insulation means of the first invention is a washing machine in which the sound insulation means of the first invention is formed integrally with the outer tub and the inner wall is provided with a sound absorber that absorbs sound of a predetermined frequency. The parts to be attached can be eliminated, and the sound insulation means can be configured at low cost.

  In the fourth invention, in particular, the sound insulation means of the third invention is a washing machine in which a space is provided between the inner wall and the sound absorber, so that the high frequency component of the belt driving sound generated by the pulley and the belt can be efficiently obtained. A washing machine that can be removed and has a more comfortable operation sound can be realized.

  In the fifth aspect of the invention, in particular, the sound insulation means of the third aspect of the invention can eliminate the sound absorber by making the inner wall integrally formed with a silencer that silences the sound of a predetermined frequency. The sound insulation means can be configured at low cost.

  According to a sixth aspect of the invention, in particular, the sound insulation means of the first invention is a washing machine having a flexible sound absorber, so that the sound insulation means vibrates even if the vibration of the outer tub is transmitted to the sound insulation means. Since it absorbs, it becomes difficult to generate noise, and even if the outer tub vibrates greatly and the sound insulation means collides with the outer frame of the washing machine, the sound insulation means bends, so that the collision sound can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a washing machine according to Embodiment 1 of the present invention, FIG. 2 is a rear view of the main part of the washing machine, and FIG. 3 is a graph showing frequency analysis of noise of the washing machine. is there.

1 to 3, the washing machine outer frame 30 elastically supports an outer tub 33 with four elastic bodies 31 and two damping devices 32. The washing / dehydrating tub 34 is rotatably disposed in the outer tub 33. The motor (driving means) 35 is composed of a brushless DC motor and is controlled by an inverter so that the rotational speed can be freely changed. The water supply means 36 supplies water into the washing / dehydrating tub 34. The water level detection means 37 detects the washing water level in the outer basket 33. The drainage means (not shown) drains the washing water in the outer tub 33. The weight 38 is attached to the outer tub 33 to increase the mass of the outer tub 33 and suppress the vibration of the outer tub 33.

  The control device 39 is provided at the lower front portion of the washing machine outer frame 30. The control device 39 sequentially controls each step of washing, rinsing and dehydration based on the setting contents inputted by the operation display means 40 provided on the upper front surface of the washing machine outer frame 30. The power switching means (FIG. The motor 35, the water supply means 36, the drainage means, etc. are sequentially controlled via a not-shown).

  The damping device 32 is a viscous damper that uses oil as a working fluid, and reduces the resonance vibration amplitude of the outer tub 33 at the time of dehydration start. The damping device 32 is provided between the bottom 30a of the washing machine outer frame and the bottom 33a of the outer tub 33. It is fixed. The legs 41 are made of an elastic material such as rubber and are disposed at the four corners of the bottom 30a of the washing machine outer frame.

  The driving means 35 is provided with a first pulley 42, and the washing and dewatering tub 34 is provided with a second pulley 43, both of which are rotatably connected by a transmission belt 44 to constitute a transmission means 45. . The reduction ratio of the first pulley 42 and the second pulley 43 is set to 10: 1. The sound insulation means 46 is made of resin and is formed in a substantially box shape, and its opening 46 a is fixed to the bottom of the outer tub 33 so as to cover the first pulley 42.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, after putting clothes and detergent into the washing and dewatering tub 34, the operation display means 40 is operated to start operation. As a result, the water supply means 36 operates, the washing water is supplied into the washing / dehydrating tub 34, and the washing / dehydrating tub 34 also starts rotating. When the specified amount of washing water is supplied, the water supply means 36 stops water supply. By the rotation of the washing and dewatering tub 34, the detergent is dissolved in the washing water and becomes a washing liquid and penetrates into the clothes. The washing and dewatering tub 34 rotates at a low speed of about 30 to 50 r / min (the number of rotations of the driving means: 300 to 500 r / min), and performs washing for a specified time to lift and drop the clothes. At this rotational speed, no harsh high-frequency sound is generated.

  After the washing is completed, the draining means is operated, and the washing water in which the dirt is dissolved is drained out of the outer tub 33. After the drainage is completed, the rotation of the washing and dewatering tub 34 is gradually accelerated and the dehydration process is started. After the dehydration is started, when the rotation speed of the washing and dewatering tub 34 increases and reaches the steady rotation speed of 900 r / min, the rotation speed of the driving means 35 becomes 9000 r / min and is transmitted to the first pulley 42. The noise level of 4 kHz to 8 kHz due to the contact sound of the belt 44 is increased, which is annoying. However, since the first pulley 42 is covered with the sound insulating means 46, the noise level in the frequency band can be lowered and the annoying sound can be eliminated.

  As described above, in the present embodiment, the first pulley 42 is covered with the sound insulation means 46 for insulating the sound of the predetermined frequency, thereby removing the high frequency component of the belt driving sound generated by the pulley and the belt. Therefore, it is possible to realize a washing machine having a comfortable operation sound without an harsh sound. Further, since the sound insulating means 46 covers only the first pulley 42 and does not cover the driving means 35, the heat dissipation of the driving means 35 is not hindered and the temperature rise of the driving means 35 is not deteriorated.

(Embodiment 2)
FIG. 4 is a perspective view of a main part of the washing machine according to the second embodiment of the present invention. In FIG. 4, the sound insulation means 46 of 1st invention is equipped with the sound insulation body 46b which covers a part of opening part 46a. Other configurations are the same as those in the first embodiment.

  With this configuration, the area of the opening 46a can be reduced, and the belt driving sound leaking from the opening 46a can be reduced.

(Embodiment 3)
FIG. 5 is a main part rear view of the washing machine according to the third embodiment of the present invention. In FIG. 5, the sound insulation means 46 of the first invention is formed integrally with the outer tub 33, and is provided with a sound absorber 47 for absorbing sound in a frequency band of 4 kHz to 8 kHz on the inner wall 46 c. Other configurations are the same as those in the first embodiment.

  As a result, it is possible to eliminate the parts to which the sound insulating means 46 is attached, and to configure the sound insulating means 46 at a low cost.

(Embodiment 4)
FIG. 6 is a main part rear view of the washing machine according to the fourth embodiment of the present invention. In FIG. 6, the sound insulation means 46 of the first invention is provided with a space 48 between the inner wall 46c and the sound absorber 47, and the width of the space 48 is 10 mm to 20 mm, which is close to a quarter wavelength of 4 kHz to 8 kHz. is there. Other configurations are the same as those in the first embodiment.

  With this configuration, it is possible to efficiently remove the high frequency component of the belt driving sound generated by the pulley and the belt, and it is possible to realize a washing machine having a more comfortable operation sound.

(Embodiment 5)
FIG. 7 is a cross-sectional view of a main part of the washing machine according to the fifth embodiment of the present invention. In FIG. 7, the sound insulation means 46 of the first invention is integrally formed with an inner wall 46c with a silencer 49 that silences a sound with a frequency of 4 kHz to 8 kHz. The silencer 49 includes a silencer chamber 49a and a silencer 49b. The width of the silencer 49b is set to 0.5 mm. The frequency to be silenced is determined by changing the dimension R of the silencer chamber 49a. At 4 kHz, R = 5 mm, at 6 kHz, R = 3.5 mm, and at 8 kHz, R = 2.7 mm. As described above, three types of muffler chambers 49a are provided. Other configurations are the same as those in the first embodiment.

  With this configuration, the sound absorber can be eliminated, and the sound insulation means 46 can be configured at a lower cost.

(Embodiment 6)
FIG. 8 is a rear view of the washing machine according to the sixth embodiment of the present invention. In FIG. 8, the sound insulation means 46 of 1st invention is made into the sound-absorbing body which has flexibility. Other configurations are the same as those in the first embodiment.

  According to this configuration, even if the vibration of the outer tub 33 is transmitted to the sound insulation means 46, the sound insulation means 46 absorbs the vibration, so that it is difficult to generate noise. Moreover, even if the outer tub 33 vibrates greatly and the sound insulation means 46 collides with the washing machine outer frame 30, the sound insulation means 46 bends, so that the collision sound can be reduced.

  As described above, the washing machine according to the present invention can eliminate the annoying noise at the time of dehydration by providing the sound insulation means in the pulley portion of the drive means, so it can be applied to the sound insulation of rotating machines other than the washing machine. Is possible.

30 Washing machine outer frame 31 Elastic body 33 Outer tub 34 Washing / dehydration tub 35 Motor (drive means)
42 first pulley 43 second pulley 44 transmission belt 45 transmission means 46 sound insulation means 46a opening 46b sound insulation body 46c inner wall 47 sound absorber 48 space 49 silencer part

Claims (6)

An outer tub supported by an elastic body provided on the outer frame of the washing machine, a washing / dehydrating tub rotatably provided in the outer tub, and a rotation of the driving means provided in the outer tub A transmission means for transmitting to the water tub, wherein the transmission means includes a first pulley provided in the driving means, a second pulley provided in the washing and dewatering tub, the first pulley, and the second pulley. A washing machine comprising a transmission belt that rotatably connects the pulley of the first pulley, and the first pulley covered with sound insulation means for insulating sound of a predetermined frequency. The washing machine according to claim 1, wherein the sound insulating means includes a sound insulating body that covers a part of the opening. The washing machine according to claim 1, wherein the sound insulating means is formed integrally with the outer tub, and a sound absorbing body for absorbing sound of a predetermined frequency is provided on the inner wall. The washing machine according to claim 3, wherein the sound insulation means has a space between the inner wall and the sound absorber. The washing machine according to claim 3, wherein the sound insulation means is integrally formed with a silencer that silences a sound of a predetermined frequency on the inner wall. The washing machine according to claim 1, wherein the sound insulation means is a flexible sound absorber.

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