JPS6121643Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a shaft sealing device that performs a sealing action using a stationary sealing ring and a rotating sealing ring, and is suitable for fluids that are difficult to seal with conventional shaft sealing devices. This relates to a sealing device.

Conventionally, when the fluid to be sealed is a fluid containing slurry, a coagulating fluid, a highly oxidizing fluid, or a so-called anaerobic fluid, ordinary shaft sealing devices such as mechanical seals are prone to abnormal wear, sticking, Phenomena such as corrosion occurred and sealing was difficult. For this reason, safety has been increased, for example, by using a special material for the structure including the sealing ring, or by doubling the shaft sealing device.
Therefore, the shaft sealing device has become very expensive and the structure itself has become complicated. In addition, in equipment such as pumps to which a shaft sealing device is attached, if the shaft sealing device part of the device is made compact, the equipment itself will be able to save labor by that much, especially in terms of the axial installation length of the shaft sealing device. It was hoped that it would be shorter. However, on the other hand, although it is not a shaft sealing device, there are simple sealing devices (so-called bearing sealing devices) for preventing grease leakage from both ends of a radial bearing, which have a short installation length and are compact. . For example, Jikko 43
There is also a bearing sealing device as seen in Publication No. 24169, but the seal ring that is in direct elastic contact with the inner ring not only has no pressure resistance at all, but also has no application to shaft sealing devices that seal fluids containing slurry, etc. I also regret not being able to do so. The present invention was developed based on the above-mentioned circumstances, and has a simple structure that effectively seals fluids that were difficult to seal in the past, and also extremely shortens the installation length in the axial direction. The present invention provides a shaft sealing device.

The present invention will be described in detail below with reference to preferred embodiments.

In the drawing, 1 is a casing of a device such as a pump, 2 is a rotating shaft, 3 is a holder holding a bearing 4, and 5 is a packing, which is fitted into the holder 3 and abuts against the rotating shaft 2. And the holding body 3
A gasket 7 is inserted into one side end 6 of the
A rotating sealing ring 8 is retained. The stationary seal ring 9 is held by a retainer 10, and by the pressing force of the bellows portion a of the retainer 10, the stationary seal ring 9 comes into contact with the rotating seal ring 8 to form a seal end face 11. There is. Further, the retainer 10 forms a lip seal portion b, which is brought into contact with the outer peripheral surface of the shaft 2, and this stationary seal ring 9
The retainer 10 holding the is fitted into the casing 1 of the device. To further explain the operating state of the shaft sealing device according to the present invention having the above structure, the retainer 10 is arranged so that the fluid F to be sealed is on the back side of the retainer 10. In other words, the lip seal portion b of the retainer 10 blocks the sealing end surface 11 from coming into direct contact with the fluid F. The sealed end surface 11 is protected by storing clean fluid such as lubricating oil in a space 12 surrounded by the sealed end surface 11, the lip seal portion b, and the shaft 2, or by injecting and circulating it. In the present invention, the retainer 10 having the bellows part a and the lip seal part b can be provided on the shaft 2 side while holding the rotary sealing ring 8, and the same operating state as described above can be achieved. Further, the retainer 10 is usually made of an elastic material such as rubber, but if the fluid to be sealed is corrosive, it may be made of synthetic resin such as fluororesin, or if the fluid is a special fluid, It may be a soft metal material, and is intended to be an elastic material depending on the fluid used.

The configuration of the present invention as detailed above has the following advantages.

The retainer itself that holds the sealing ring is provided with a panel means (meaning a bellows part), and there is no need to separately provide a spring means as in the past, so the installation length in the axial direction as a shaft sealing device can be reduced. It can be made extremely short. For example, the outermost diameter of the shaft or sleeve is 40 mmφ, whereas in the conventional product (mechanical seal) it is 40 mm to 50 mm, in the present invention it is 5 mm to 10 mm.

Since the number of parts of the shaft sealing device that constitutes the present invention is extremely small, the production process is reduced and it is inexpensive. Since it is a sliding type mechanical seal on the upper end, it has higher pressure resistance than the lip type.

Since the assembly is made into a unit,
It is extremely easy to attach and detach from equipment, facilitating on-site work in the market.

Since the retainer that holds the sealing ring itself has a lip seal part that comes into contact with the shaft (or sleeve), for example, there is no need to provide a separate lip seal to complicate the structure of the shaft seal device. The structure is as follows.

Of course, since the fluid to be sealed does not come into direct contact with the sealing end surface, depending on the type of sealing fluid,
The traditional and complicated process of selecting sealing ring materials and other structural materials is no longer necessary.

The sealing portion constituted by the stationary sealing ring and the rotating sealing ring does not necessarily have to be in an end face state, but may be in any desired shape, such as line contact (having a sharp cutting edge instead of an end face). I can do it.

As explained above, the present invention is a shaft sealing device with many advantages and will make a considerable contribution to the industrial market.

[Brief explanation of the drawing]

The drawing shows an embodiment of the shaft sealing device according to the present invention, and is a half sectional view. DESCRIPTION OF SYMBOLS 1... Casing, 2... Shaft, 8... Rotating sealing ring, 9... Stationary sealing ring, 10... Retainer, a
...Bellows part, b...Lip seal part.

Claims (1)

[Scope of utility model registration request] One side end 6 of the holder 3 that is fitted onto the rotating shaft 2 via the packing 5 and rotated together with the rotating shaft 2.
Rotating sealing ring 8 held via gasket 7 in
, a stationary sealing ring 9 that abuts on the rotary sealing ring 8 to form a sealing end surface 11 , a lip seal portion b that has a portion that holds the stationary sealing ring 9 and abuts on the rotating shaft 2 , and a stationary sealing ring 9 . A shaft sealing device having a structure in which a retainer 10 made of an elastic material is integrally provided with a bellows portion a for pressing a ring 9 against a rotary sealing ring 8.