Vibration control device and waterproof pan for washing machine

Abstract

To provide a vibration control device which can be used for a washing machine used in a house and achieves stable vibration control performance against weight change of the washing machine, and to provide a waterproof pan for a washing machine.SOLUTION: A vibration control device 1 is disposed between a floor surface 7 of a building and a washing machine 8 installed in the building and reduces transmission of vibration from the washing machine 8 to the floor surface 7. The vibration control device 1 includes: an elastic part 2 formed by stacking a plurality of disc springs 21; a load receiving part which is elastically supported by the elastic part 2 and receives a load of the washing machine 8; and a housing cylinder part 3 which houses the elastic part 2. The housing cylinder part 3 is filled with a viscous material 5.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vibration isolation device that reduces the transmission of vibrations from a washing machine to a floor, and a waterproof pan for a washing machine. [Background technology]

[0002] Patent Document 1 discloses a composite vibration control device that can absorb vibration energy using the restoring force of a disc spring adjusted to its elastic range. This composite vibration control device reduces the weight of the rod by reducing the cross section of the rod in which the disc spring is arranged on the outer periphery, and also enables the initial load setting and spring adjustment of the disc spring.

[0003] Furthermore, Patent Document 2 discloses a vibration suppression device that can be applied to large structures, has high stability with respect to horizontal loads, and can be set to a large spring constant in the vertical direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-29925 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-199541 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although the structures disclosed in Patent Documents 1 and 2 are configured with disc springs, they are used for large structures such as buildings, and are not used for washing machines used inside homes. Furthermore, while the washing machines described above typically use vibration-damping rubber to attenuate vibrations, such vibration-damping rubber cannot provide stable vibration-damping performance against changes in the weight of the washing machine.

[0006] The present invention aims to provide a vibration isolation device and a waterproof pan for a washing machine that can be used in a washing machine used indoors and that can exhibit stable vibration isolation performance even when the weight of the washing machine changes. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the vibration-damping device of this invention is a vibration-damping device that is placed between the floor of a building and a washing machine installed within the building to reduce the transmission of vibrations from the washing machine to the floor, and is characterized by having an elastic part made up of a plurality of stacked disc springs, and a load-receiving part that is elastically supported by the elastic part and receives the load of the washing machine.

[0008] The above-mentioned configuration, which includes an elastic portion made up of multiple stacked disc springs, can provide stable vibration-damping performance even when the weight of a washing machine used indoors changes. In particular, the overall spring characteristics of the disc springs can be changed by increasing or decreasing the number of springs and by stacking them, making it easy to adjust the vibration-damping characteristics of the vibration-damping device in design to suit the weight of the target washing machine. In addition, the stored energy per unit volume is greater than that of a coil spring, allowing for a large load-bearing capacity with a small stroke.

[0009] The device may include a cylindrical housing that houses the elastic portion, and the load receiving portion may include a protruding portion that protrudes outward from a through hole formed in a top plate portion of the cylindrical housing, and a sliding support portion that is supported by the elastic portion and slides on the inner circumferential surface of the cylindrical housing. In this way, the sliding support portion of the load receiving portion can be stably supported by the inner circumferential surface of the cylindrical housing, rather than supporting the load receiving portion using a hole in the center of the disc spring.

[0010] The cylindrical housing portion may be filled with a viscous material, which makes it possible to reduce the number of disc springs and thereby make it easier to make the vibration-damping device thinner.

[0011] The elastic portion may be entirely saturated with the viscous material while under the load of the washing machine.

[0012] The viscosity of the viscous material may be VG200 to VG400.

[0013] In a configuration in which the viscous material is filled in the cylindrical housing, a heat insulating material may be provided at least on the outer periphery of the cylindrical housing, thereby preventing the viscosity of the viscous material from changing due to temperature changes indoors.

[0014] The natural frequency of the elastic portion may be set to 1 / √2 or less of the frequency of vibration caused by the rotation speed of the laundry basket during spin-drying of the washing machine.

[0015] The waterproof pan for a washing machine according to the present invention is characterized by including the above-mentioned vibration-damping device. With this waterproof pan for a washing machine, there is no need to place individual vibration-damping devices on each of the washing machine's multiple legs. Simply installing the washing machine on a single waterproof pan for a washing machine supports the multiple legs of the washing machine while transmitting vibrations from these legs to the vibration-damping device. In addition, the multiple vibration-damping devices can be operated as a unit by the waterproof pan for a washing machine. [Effects of the Invention]

[0016] According to the present invention, since the elastic portion is made up of a plurality of stacked disc springs, it has various advantages such as being able to exhibit stable vibration-damping performance even when the weight of the washing machine used changes. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is an explanatory diagram showing an embodiment of a vibration isolation device on which a washing machine is placed; [Figure 2] FIG. 2 is an explanatory diagram showing the internal structure of the vibration isolation device according to the embodiment. [Figure 3] 3 is a perspective view showing a disc spring used in the vibration isolation device of FIG. 2. FIG. [Figure 4] 10 is a graph comparing the characteristics of the vibration isolation device of the embodiment with those of a vibration isolation device using rubber. [Figure 5] 10A and 10B are explanatory diagrams showing an anti-vibration device according to another embodiment. [Figure 6] 2 is an explanatory diagram showing a waterproof pan for a washing machine in which the vibration-isolating device of FIG. 1 is placed on a convex portion that is the support portion of the legs of the washing machine. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in Fig. 1, a vibration-damping device 1 according to the embodiment is disposed between a floor 7 of a house and legs 81 of a washing machine 8 installed in the building, to reduce transmission of vibrations from the washing machine 8 to the floor 7. In this embodiment, as an example, the washing machine 8 has a capacity of about 11 kg, and vibrations generated by the washing machine 8 during spin-drying are about 13 Hz when the motor for the laundry basket rotates at 800 revolutions per minute. The diameter (outer diameter) of the legs 81 is, for example, 30 mm to 50 mm, and the vibration-damping device 1 is manufactured to have a height of 100 mm or less.

[0019] As shown in Fig. 2, each vibration-damping device 1 includes an elastic part 2, a tubular housing part 3, a load-receiving part 4, and a viscous material 5. Fig. 2 shows a state in which the load-receiving part 4 has sunk slightly when the legs 81 of a washing machine 8 are placed on the vibration-damping device 1 and a load is applied to it.

[0020] As shown in FIG. 3 , the elastic portion 2 is formed by stacking, for example, ten disc springs 21. The disc springs 21 are all the same size, for example, with an outer diameter of 35.5 mm, a central hole inner diameter of 18.3 mm, a plate thickness of 1.25 mm, and an overall height of 2.25 mm. When ten of these disc springs 21 are stacked in series, the stack height is 22.5 mm. In this embodiment, the elastic portion 2 is entirely immersed in the viscous material 5 when it is under the load of an empty washing machine 8. Of course, the elastic portion 2 may also be entirely immersed in the viscous material 5 when it is not under the load of the washing machine 8.

[0021] If the vibration during dehydration is about 13 Hz as described above, the natural frequency of the elastic part 2 is set to 1 / √2 or less, for example, 8 Hz. The natural frequency (spring constant) of the elastic part 2 varies depending on the amount of deflection of each disc spring 21 against the load, the number of disc springs 21 used, and the usage form (series or parallel).

[0022] In the case of vibration-damping rubber, soft rubber is required to ensure vibration-damping performance. Rubber deforms in a similar manner to water in a rubber balloon, so when the washing machine 8 is placed on it, the rubber is crushed significantly, and rigidity in the compression direction cannot be ensured. On the other hand, in the case of disc springs, the number of layers can be adjusted to ensure vibration-damping performance. Even when the washing machine 8 is placed on it, it only deforms in the axial direction, so the necessary rigidity in the compression direction can be ensured.

[0023] The accommodating tube portion 3 has a cylindrical shape and accommodates the elastic portion 2 made up of the above-mentioned multiple disc springs 21. For example, the outer diameter of the accommodating tube portion 3 is 50 mm and the height is 60 mm. The plate thicknesses of the peripheral plate portion 31, bottom plate portion 32, and top plate portion 33 of the accommodating tube portion 3 are each 6 mm. The inner diameter of the accommodating tube portion 3 is 50 mm - 12 mm = 38 mm, and a gap of 1.25 mm is created between the outer peripheral surface of the disc springs 21 and the inner peripheral surface of the accommodating tube portion 3. However, when the disc springs 21 vibrate, the outer peripheral surface of the disc springs 21 rubs against the inner peripheral surface of the accommodating tube portion 3.

[0024] The load receiving portion 4 is composed of a cylindrical protruding portion 41 and a disk-shaped sliding support portion .

[0025] The protruding portion 41 protrudes upward and externally from a through-hole 33a formed in the top plate portion 33 of the tubular housing portion 3. The protruding portion 41 has, at its upper end, a leg receiving portion 41a that receives the leg portion 81 of the washing machine 8.

[0026] The sliding support part 42 is supported by the elastic part 2 inside the tubular housing part 3 and slides on the inner circumferential surface of the tubular housing part 3. In this embodiment, as shown in Fig. 2, when the load receiving part 4 is sunk under load, the sliding support part 42 is located below the liquid surface of the viscous material 5, whereas when no load is applied to the load receiving part 4, the upper surface of the sliding support part 42 and the lower surface of the top plate part 33 are in close contact with each other. Of course, the present invention is not limited to this configuration.

[0027] In addition, the inner peripheral surface of the casing cylindrical portion 3 and the outer peripheral surface of the sliding support portion 42 are coated with a coating such as hard chrome plating to improve sliding and prevent scratches. It is desirable to perform processing such as rounding (polishing) on ​​the outer periphery of the disc spring 21.

[0028] The viscous material 5 is an oil material with a high viscosity of approximately VG200 to VG400 (preferably approximately VG300). When the viscous material 5 has a high viscosity, variations in vibration-damping performance can be reduced even if there are variations in the spring stiffness of the disc springs 21. In this embodiment, for example, the damping force is set to approximately 10 to 30% (preferably approximately 20%) of the resistance force to the spring stiffness. That is, when the washing machine vibrates, the disc springs 21 repeatedly deform and return at a certain speed within the viscous material 5 due to the force of this vibration, and the damping force of the viscous material 5 is set to approximately 10 to 30% of the spring force (spring stiffness) of the disc springs 21 at this speed. Complex stiffness is stiffness expressed as a complex number, and by using this complex stiffness, the resistance force of a device that depends on speed can also be expressed as stiffness.

[0029] The above-described configuration includes an elastic portion 2 made up of multiple stacked disc springs 21, which provides stable vibration-damping performance against weight changes that occur during washing and spin-drying of a washing machine 8 used indoors. In particular, the overall spring characteristics of the disc springs can be changed by increasing or decreasing the number of springs and by stacking them, making it easy to adjust the vibration-damping characteristics designed for the vibration-damping device to suit the weight of the target washing machine. Furthermore, the stored energy per unit volume is greater than that of a coil spring, allowing for a large load-bearing capacity with a small stroke. Furthermore, when the weight of the washing machine 8 increases due to water supply or other factors, the rigidity of the disc springs 21 decreases, the natural frequency of the elastic portion 2 decreases, and the vibration-damping effect increases.

[0030] FIG. 4 is a graph comparing the characteristics of a vibration-damping device 1 (containing viscous material 5) using three types of disc springs 21 with different damping forces in the structure according to the embodiment shown in FIG. 2 with those of vibration-damping rubber. In this graph, the vibration frequency to be damped is varied by changing the stiffness of the disc springs 21 for washing machines of the same weight. The horizontal axis represents this variation in vibration frequency (equivalent to variations in the vibration-damping system, i.e., variations in the washing machine weight (during washing and spin-drying)). The vertical axis also represents the magnification of the vibration from the washing machine (here, the frequency is fixed) when the vibration is damped by the vibration-damping system. This magnification is based on the floor vibration without the vibration-damping device, which is set to 1. A desirable characteristic is a vibration transmissibility (vertical axis) of less than 1 at a frequency of 13 Hz (horizontal axis). In the case of the disc springs 21, the natural frequency can be lowered, thereby reducing the magnification for 13 Hz vibration, which is a rotational frequency that causes intense rotation. The damping was assumed to be able to follow changes in rotation speed, with the aim of reducing the magnification, at the same level as the values ​​calculated here. Anti-vibration rubber can only achieve the washing machine's natural frequency of about 13 Hz, so the magnification of the vibration increases.

[0031] When the viscous material 5 is filled inside the accommodating cylindrical portion 3, the viscous material 5 can reduce the number of disc springs 21, making it easy to reduce the thickness of the vibration-damping device 1. In a configuration in which the viscous material 5 is filled inside the accommodating cylindrical portion 3, if a heat insulating material (not shown) is provided at least on the outer periphery of the accommodating cylindrical portion 3, it is possible to prevent the viscosity of the viscous material 5 from changing due to changes in the indoor temperature.

[0032] When the load receiving portion 4 is provided inside the tubular housing portion 3, the sliding support portion 42 of the load receiving portion 4 can be stably supported by the inner peripheral surface of the tubular housing portion 3. Of course, the structure is not limited to this, and a vibration-damping device 1A shown in Fig. 5 can also be used. This vibration-damping device 1A has a structure in which multiple disc springs 21 are arranged on a base 35 having a hole 35a in the center, and a sliding columnar portion 44 protruding from the underside of the load receiving portion 4 is inserted into the hole in the center of the disc spring 21, and the lower end of this sliding columnar portion 44 is inserted into the hole 35a.

[0033] As shown in FIG. 6 , the vibration isolation devices 1, 1A may be arranged on the waterproof pan 6 of the washing machine 8, in a convex portion 61 that serves as a support portion for the legs 81 of the washing machine. Alternatively, the vibration isolation devices 1, 1A may be configured to be built into the convex portion 61 of the waterproof pan 6. When the vibration isolation devices 1, 1A are provided integrally with the waterproof pan 6 of the washing machine 8 in this way, there is no need to provide individual vibration isolation devices 1, 1A for each of the washing machine's legs. Simply installing the washing machine on a single waterproof pan 6 for the washing machine can support the multiple legs 81 of the washing machine 8 while transmitting vibrations from these legs 81 to the vibration isolation devices 1, 1A. Furthermore, the multiple vibration isolation devices 1, 1A can operate integrally with the waterproof pan 6 for the washing machine.

[0034] Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiments within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0035] 1: Vibration isolation device 1A: Vibration isolation device 2: Elastic part 3: Housing tube 4: Load receiving part 5: Viscous material 6: Waterproof pan for washing machine 7: Floor 8: Washing machine 21: Disc spring 31: Peripheral plate 32: Bottom plate part 33: Top plate 33a: Through hole 35: Pedestal 35a: Hole 41:Protrusion 41a: Leg holder 42: Sliding support part 44: Sliding cylindrical part 61:Convex part 81: Legs

Claims

1. A vibration isolation device that is disposed between a floor surface of a building and a washing machine installed in the building and reduces transmission of vibrations from the washing machine to the floor surface, A vibration-damping device comprising: an elastic portion formed by stacking a plurality of disc springs; and a load-receiving portion that is elastically supported by the elastic portion and receives the load of the washing machine.

2. 2. The vibration-damping device according to claim 1, further comprising a cylindrical accommodating portion that accommodates the elastic portion, wherein the load-receiving portion comprises a protruding portion that protrudes outward from a through hole formed in the top plate portion of the cylindrical accommodating portion, and a sliding support portion that is supported by the elastic portion and slides on the inner surface of the cylindrical accommodating portion.

3. 3. The vibration-damping device according to claim 2, wherein the cylindrical housing portion is filled with a viscous material.

4. 4. The vibration-isolating device according to claim 3, wherein the elastic portion is entirely immersed in the viscous material when subjected to the load of the washing machine.

5. 4. The vibration-damping device according to claim 3, wherein the viscosity of the viscous material is VG200 to VG400.

6. 4. The vibration-damping device according to claim 3, further comprising a heat insulating material at least on the outer periphery of said cylindrical housing portion.

7. 2. The vibration-isolating device according to claim 1, wherein the natural frequency of the elastic portion is set to 1 / √2 or less of the frequency of vibration caused by the rotational speed of the laundry basket during spin-drying of the washing machine.

8. A waterproof pan for a washing machine, comprising the vibration-damping device according to any one of claims 1 to 7.

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