JPS6013718B2 - dehydration washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dehydrating washing machine, and more specifically, in a structure in which a washing shaft and a dehydrating shaft are installed upright, an oil seal that seals the dehydrating shaft is covered with a cap that has a special function. The purpose of this is to fully exhibit the oil seal effect.

The structure of a conventional dehydrating washing machine of this kind is as shown in Figure 1. Reference numeral 1 is a main body made of a thin steel plate that covers the sides of the dehydrating washing machine from all sides and is coated to prevent the laundry from entering. It is covered with a top plate having a slot 2 for loading and unloading, and legs 4 in contact with the floor are fixed to the four corners of the bottom. Reference numeral 5 denotes a cylindrical inner tank with a large number of dewatering holes 6 on the side wall, which serves both as a washing tub and a dehydrating tank.
is provided in the center, and a balance weight 9 is fixed to the inner circumferential side wall of the upper entrance with screws 10.

Reference numeral 11 denotes a cylindrical outer tank surrounding the inner tank 5, which holds the washing liquid during washing and receives the washing liquid during spin-drying.

An outer tank cover 12 is attached to the upper entrance of the outer tank 11 to cover the space between the inner tank 5 and the outer tank 11. A bottom plate 13 is provided at the bottom of the outer tank 11, and an upper ball bearing housing 16 that holds the dewatering shaft oil seal and the upper ball bearing 15, and a lower ball bearing housing 18 that holds the lower ball bearing 17 are attached to the upper ball bearing housing 16 with screws 19. It is fixed at the bottom of the outer tank 11 and attached to the bottom plate 13 with bolts 20 and nuts 21.

At the bottom of the inner tank 5 and below the rotor blade 8, an inner tank holding plate 2 is provided.
A coupling 24 fixed with a bolt 23 via a shaft 2 is screwed and fixed to a stepped portion formed on the upper part of a hollow dehydration shaft 25 with a nut 26.

The dehydration shaft 25 connected to the bottom of the inner tank 5 is held by the dehydration koji oil seal 14 and upper and lower ball bearings 15 and 17 to provide a bearing action. A washing shaft oil seal 27, an upper bearing metal 28, and a lower bearing metal 29 are press-fitted into the hollow interior of the dehydration shaft 25, and the washing shaft 31, which is fixed at the top of the rotating blade 8 and screw 301, is held, and the bearing give effect.

A boss 33 of a washing pulley 32 is fixed to the lower part of the washing shaft 31 with a pin 34, and a motor 35 is fixed to the lower side of the bottom plate 13.
The upper washing pulley 32 is rotationally driven through a motor pulley 36 and a belt 37. Boss 33 of washing pulley 32
A helical clutch spring 38 is provided on the outer periphery of the dehydration shaft 25 and the lower end outer periphery of the dewatering shaft 25, and the lower end jaw 39 is engaged with an operating cylinder 41 that is cylindrical and has a large number of teeth 40 on the outer periphery. A clutch lever 43 is rotatably attached to a lever receiver 42 provided on the side wall of the lower ball bearing housing 18 via a lever pin 44, and a pawl pin 4 is provided at the tip of the clutch lever 43.
A clutch pawl 46 is provided through 5. A spherical support 7 is formed on the outside of the bottom plate 13, and a spring 48 is supported from the upper part of the main body via a rod 49 in a vibration-proof manner.
This is a fixed brake wheel for braking at the end of dehydration, and the related brake mechanism will be omitted.

In the above configuration, during washing, the motor 36 is driven to rotate the rotary blades 8 via the motor pulley 36, belt 37, washing booley 32, and washing shaft 3, and the washing liquid is held in the outer tank. The laundry thrown into the inner tub 6 is washed by the rotating water flow generated in the inner tub 6.

At this time, push the teeth 40 of the operation tube 41 from the clutch claw 4 stitches of the clutch lever base 3 to release the clutch spring 38.
Loosen the boss 33 of the washing pulley 32.
The rotation should not be transmitted to the dehydrated koji 25 side.
During spin-drying, when the clutch claw 46 is released from the teeth 48 of the operation barrel 41 and the clutch spring 38 is rotated to the tight side, the inner tub 5 is rotated via the spin-driving ball 25, and the laundry is completely spin-dried. In the explanation, the washing shaft oil seal 27 and the dehydrating shaft oil seal 14 are supposed to be called water seals because in the case of a washing machine, their purpose is to seal water, not oil.
Since it is generally called an oil seal, this is cited hereafter and will be applied mutatis mutandis hereafter.

FIG. 2 shows a conventional seal structure for a dewatering shaft. The amount of dehydrated oil seal 4 is the upper lip 5 for the outer tank 11 and the ball seal part that seals the main lip 51 of nitrile rubber by applying tension from the outer periphery by the seal spring 52.
There is a metal can 5 inside.
4 is insert-molded, and an auxiliary lip 55 for receiving grease is provided below the main lip 51. A dust lip 56 made of nitrile rubber is provided on the upper side to prevent dust from entering, and a metal can 57 is insert-molded into the dust lip 56 and press-fitted into the main lip 51 at a portion 58 to form an integrated dehydration shaft. An oil seal 14 is formed. Conventionally, in order to improve the reliability of the dewatering shaft oil seal 14, a dust lip 56 to prevent dust from entering has been provided to provide double protection to the main lip 51 and prevent water leakage. However, it was not necessarily sufficient.

If a scratch occurs on the dewatering shaft 25 during handling, the seal lip will be damaged by the scratch and water will leak. Additionally, small scratches on the tip of the seal lip during processing can also cause water leakage. In order to determine whether or not these scratches have occurred, whether it is on the wisteria trellis or the seal lip side, it is necessary to rely on visual inspection of the entire circumference. Furthermore, among the foreign substances that adhere to laundry and enter, hard and fine powders such as glass-like powder and metal powder enter the tip of the seal lip together with water and easily damage the lip, causing water leakage. It is something.

Furthermore, recently there has been a remarkable improvement in detergents (detergents that are particularly resistant to oil stains tend to damage the grease that is inserted between the lip of the oil seal for lubrication, resulting in poor lubrication and water leakage.) The invention provides a structure that normally prevents water from entering the oil seal, and that does not cause water leakage even if there is a slight scratch.Examples of the invention will be described below.

In FIG. 3, a stepped portion 59 is provided on the upper side of the main lip 51 to form a flat surface, an upper main lip 60 is placed on top of this, and an upper seal spring 61 is provided outside of this upper main lip 60 to provide tension. A flange 62 is provided on top of this spring 61 to prevent it from coming off, and a flat part 63 is formed on this, and a dust lip 64 is formed upward from the inside of this flat part 63. , the outer circumferential portion of the upper seal spring 61 and flange 62 is called a flange part.The flat part 63 and the dust lip 64 formed thereon can be called a flange part with a diameter of 4 mm than the flange part. .

Below the upper main lip 60 is an upper auxiliary lip 6 that receives grease.
5 will be provided. A metal can 66 is insert-molded into these and press-fitted into the main lip 51 at a portion 67 to form an integrated dewatering shaft oil seal 68. A cap 69 is provided above the dust lip 64 provided at the upper end of the dehydration shaft oil seal, which is sealed and fixed to the dehydration shaft and encloses the upper end and the vicinity of the upper part of the oil seal.

The cap 69 is made of ballistic material such as rubber,
The boss 70 is press-fitted and fixed to the dewatering shaft 25.

A lip 71 is provided on the inner wall of the boss 70 to ensure a seal with the shaft. The lower part of the boss 70 forms an umbrella part 72 that encloses the upper part of the oil seal. The umbrella part 72 covers the upper part of the oil seal's rigid part 59. In the above configuration, when water enters the outer tank during washing or rinsing, the umbrella portion 7 of the cap 69
Air accumulates inside 2.

However, water does not enter at all, but due to the water pressure above the cap 69, the water rises to a position slightly above the bottom of the cap 69 until the water pressure is balanced. , the air inside the cap 69 comes out, and that much water gets in.

In order to provide a margin for water intrusion, it is necessary to provide an overlap between the upper end of the dust lip of the oil seal and the lower end of the cap. By providing the cap 69 in this way, water does not penetrate to the dust lip 64 of the oil seal 68, so it is almost impossible for the lip of the oil seal 68 to be damaged by foreign matter such as sand or metal powder, resulting in water leakage. It doesn't happen. During spin-drying, water squeezed from the laundry falls near the spin-dry shaft oil seal, and the water shakes violently due to the vibrations of spin-drying.

For this reason, water easily enters the cap 69, and therefore the gap between the oil seal 68 and the umbrella portion 72 of the cap 69 needs to be designed to be small. However, if the gap is made too small, only a small amount of water will enter during washing and rinsing, but water will not come out easily even when the cap 69 is rotated for spin-drying. Forming a layer of water that rises in the direction between 72
For this reason, a phenomenon occurs in which water does not come out. If a layer of water remains, the oil seal will not open even after use, and the water will evaporate, causing high humidity inside the cap and leaving water droplets around the lip tip. If this is repeated, ``the cap 69 is completely filled with water, and it does not come out outside. The water near the seal will disappear, but on the other hand, if there is always water in the cap,
Water easily enters the oil seal during dehydration. That is, by providing the cap 69, an air reservoir is created, which may have the opposite disadvantage of improving durability. However, as is clear from this example, according to the present invention, by forming the cap with an elastic material such as rubber,
During dehydration, the outer periphery expands outward, making it easier for the water inside the cap to come out, which helps to shake off water droplets caused by dehydration, further increasing the effectiveness of the cap and extending the life of the oil seal. This provides sufficient water leakage prevention effect.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional dehydrating washing machine, Figure 2 is an enlarged cross-sectional view of a conventional oil seal section, and Figure 3 is an enlarged cross-sectional view of a conventional oil seal section.
The figure is an enlarged sectional view of a main part showing a seal portion of a dehydration shaft in an embodiment of the present invention. 25... Dehydration shaft, 68... Oil seal,
69...cap. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] 1. An oil seal circumscribing the dehydration shaft, and a cap made of an elastic material located above the oil seal, sealed and fixed to the dehydration shaft, and rotating together with the dehydration shaft. This dehydrating washing machine has an umbrella part that expands toward the outside and overlaps the upper part of the oil seal in a free state.