JP2003097728A5 - - Google Patents

Description

[0004]
The O-rings 160A and 160B are disposed on the inner diameter surface and the side surface of the rotary seal ring 151 between the rotary seal ring 151 and the sleeve 171, and the joint surfaces of the two parts are sealed. Also, it is pressed against the resilient so as to face each other by a first spring 160 C and the second spring 160 D and the first stationary seal ring 152 second stationary seal ring 153 is seated in the seal case 181. Further, the first fixing seal ring 152 and the second fixing seal ring 153 are respectively sealed by the third O-ring 161A and the fourth O-ring 161B with respect to the seal case 181. Then, the liquid A is supplied to the sealed chamber from the liquid supply port 182 provided in the seal case 181. The liquid A is applied to the seal surfaces 151A and 151B on both sides of the rotary seal ring 151, the first fixed seal surface 152A of the first fixed seal ring 152 and the second fixed seal surface of the second fixed seal ring 153 Sealed closely with 153A. The rotary seal ring 151 is engaged with a drive pin 179 fixed to the sleeve 171 so as to rotate integrally with the rotary shaft 170.

[0006]
However, when the diameter of the sleeve 171 increases, the outer diameter of the mechanical seal 150 also increases, and the mechanical seal 150 as a whole also increases. At the same time, since the seal surfaces 151A, 151B, 152A, 153A also have large diameters, sliding resistance becomes large. Furthermore, increasing the junction area of the stepped portion 172, rotary seal ring 1 51 from being made of ceramics or the like, sealing surface 151A by crimping with increased junction area, to worsen the flatness and 151B are deformed Become. As a result, it is difficult to make a sealing contact, and the fluid to be sealed leaks.

[0012]
Furthermore, when used with mechanical seals in the rotary joints, together with the rotor 102 for holding unit 112 is required for attaching the rotary seal ring 110 to the rotor 102 becomes longer in the axial direction, complicated the structure of the mechanical seal There is a problem that Furthermore, since the rotary seal ring 110 and the holding portion 112 are attached to the rotor 102 in a complicated manner, vibrations and the like may occur when the rotor 102 is rotated at high speed, which is a problem. In addition, since the rotary seal ring 110 and the holding portion 112 are attached to the rotor 102, the weight increases and a large amount of power energy is consumed.

[0022]
FIG. 1 is a mechanical seal device 1 showing a first embodiment . Mechanical seal device 1 of this is used as a shaft sealing device, such as a water pump or circulation pump or agitator boiler. FIG. 1 shows a shaft seal device for a pump A, which is composed of a first mechanical seal 1A and a second mechanical seal 1B. The mechanical seal device 1 is provided between the fitting of the rotary shaft 50 and the housing 60 of the device to seal the working fluid in the device H.

[0026]
A first mechanical seal 1A is disposed on one side of the rotary seal ring 2. The first mechanical seal 1A is composed of a first stationary seal ring 10A and a first seal surface 3A on one side of the rotary seal ring 2. The first stationary sealing ring 10A of the annular body is provided with a first relative sealing surface 11A in close contact with the first sealing surface 3A. The first stationary seal ring 10 A is fitted in axially movably to the fitting surface of the outer periphery of the holding portion 61 of the housing 60. Furthermore, the first stationary seal ring 10 A is formed with a stepped portion of the O-ring, O-ring 12 is provided between the step portion of the fitting surface of the stepped portion and the housing 60, the O-ring 12 seals the interval fitting the fitting surface of the first stationary seal ring 10 a and the holding portion 61.

[0028]
A second mechanical seal 1B is provided on the second seal surface 3B side of the rotary seal ring 2. The second mechanical seal 1B is also configured by the second stationary seal ring 10B and the other second seal surface 3B of the rotary seal ring 2. The second stationary seal ring 10B forming an annular body is formed in substantially the same shape as the first stationary seal ring 10A. Then, pushed by the second stationary seal ring 10 B even with is movably held on the mating face of the second holding portion 65 in the housing 60, the coil spring 14 similarly to the first stationary seal ring 10A It is done. The other configuration is substantially the same as that of the first stationary seal ring 10A. Since the first stationary seal ring 10A and the second stationary seal ring 10B are configured in substantially the same manner, component construction is easy and assembly is easy, so that the mechanical seal device 1 is inexpensive. Can.

[Description of the code]
Reference Signs List 1 mechanical seal device 1A first mechanical seal 1B second mechanical seal 2 seal ring for rotation 3 seal surface 3A first seal surface 3B second seal surface 4 second engagement hole 5 reinforcing ring 6 drive pin 6A head 6B pin portion 7 second fluid passage 10 stationary seal ring 11 relative seal surface 11A first relative seal surface 11B second relative seal surface 12 O ring 13 recess 14 coil spring 15A first O ring 15B second O ring 16 tapered surface 17 inner circumferential surface 18 Tapered surface 41 Inflow passage 42A First supply passage 42B Second supply passage 50 Rotary shaft 51 Key 52 Sleeve 53 First engagement hole 53A Counterbore 54 Annular groove 55 Second O-ring 56 Outer peripheral surface 57 Annular groove 58 First O-ring 59 first fluid passage 60 housing 61 first holding portion 62 fluid chamber 63 locking pin 70 first inflow passage 71 second inflow Passageway 75 Outflow passage H Inside the device

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