JP2804103B2 - Shaft sealing device for concentric twin shaft - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentric biaxial shaft sealing device that penetrates and moves to the outside of a container inside a high-temperature, high-pressure, or vacuum container. Things.

[Conventional technology]

In the conventional shaft sealing device, a single shaft sealing device is generally used for one shaft. Moreover, the shaft in this case is limited to a solid shaft.

However, with the development of industry, a complicated shaft sealing mechanism is gradually required.

For example, taking the polymerization machine used in the production of engineering plastics as an example, high-viscosity agitation is required. One solution is to use a concentric twin-screw to stir the inside and outside of the container. Has also been devised. This concentric twin-screw stirring can be seen in a mixer used in one of the manufacturing equipment in the food industry. However, the function of the shaft sealing portion of these devices is to prevent foreign substances from entering from outside, and not to maintain high pressure and vacuum.

Incidentally, a device related to this type is, for example, Japanese Utility Model Laid-Open No. 58-156527.

[Problems to be solved by the invention]

The prior art described above does not consider the pressure resistance and vacuum resistance of the shaft sealing portion, and the shaft sealing device used in the conventional mixer has a drawback that pressure resistance and vacuum resistance cannot be obtained.

The object of the present invention, in concentric biaxial and concentric multiaxial,
An object of the present invention is to provide a shaft sealing device having pressure resistance and vacuum resistance.

[Means for solving the problem]

The object is to provide a rotatable inner shaft, a hollow shaft provided outside the inner shaft and rotatable independently of the rotation of the inner shaft, and free rotation of each shaft covering the hollow shaft. In a concentric biaxial device consisting of a main body that can be supported, between the inner shaft and the hollow shaft and between the hollow shaft and the main body,
At a position between the mechanical seals provided respectively, the communication holes respectively communicating the shaft sealing chambers of the two mechanical seals at two positions separated in the axial direction, and the two positions separated in the axial direction. A partition plate for partitioning the shaft sealing chamber of the hollow shaft, a coolant is supplied from outside to one of the partition spaces in the shaft sealing chamber of the hollow shaft partitioned by the partition plate, and the supplied coolant is supplied to one of the partition spaces. Flowing into the shaft sealing chamber of the inner shaft through the communication hole, further flowing into the other of the partition space through the other communication hole, and taking out the cooling liquid from the other of the partition space to the outside by the cooling liquid supply / recovery means. Achieved.

[Action]

The concentric twin-screw shaft sealing device forms a shaft-sealing device for the inner shaft with a rotating ring provided on the outer periphery of the inner shaft and a fixed ring provided inside the hollow shaft so as to face the rotating ring. Sealed.

On the other hand, a rotary ring is also provided on the outer periphery of the hollow shaft, and a fixed ring opposed thereto is provided inside the main body to form and seal a shaft sealing device for the outside of the hollow shaft. As described above, the concentric two shafts are sealed by the shaft sealing devices individually provided on the outer periphery of each shaft, so that pressure resistance and vacuum resistance can be obtained.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In the figure, rotating rings 4 and 5 are provided on the outer periphery of the inner shaft 1, and the rotating rings 4 and 5 are pressed against the fixed seats 2 and 3 by springs 7a and 7b and are slid at the portion A. The springs 7a and 7b are fixed to a spring receiver 6 fixed to the inner shaft 1. On the other hand, fixed seats 2 and 3
It is fixed to the housings 8, 9 and is provided inside the hollow shaft 10, and rotates together with the hollow shaft 10.

In addition, rotating rings 13 and 14 are provided on the outer peripheral surface of the hollow shaft 10, and are pressed against the fixed seats 11 and 12 by springs 16 a and 16 b and slid at a portion B. The springs 16a and 16b are fixed to the spring receiver 15, and rotate together with the hollow shaft 10. The fixed seats 11 and 12 are fixed to covers 17 and 19 provided on both sides of the main body 18, respectively.

Now, considering the shaft seal between the inner shaft and the hollow shaft, the rotating ring 4,
5 and fixed seats 2 and 3 can be sealed. Further, the hollow shaft and the main body can be sealed by the fixed ring 13 and the fixed seats 11 and 12.

Also, considering the flow of the cooling liquid, the hollow shaft 10 passes through the passage 26 provided in the cover 19 while cooling the outer periphery of the fixed seat 11.
Into the shaft sealing chamber 24 A partition plate 22 is provided in the shaft sealing chamber 24, and the cooling liquid enters the shaft sealing chamber 23 of the inner shaft 1 through the communication hole 20 of the hollow shaft. Here, after cooling the outer periphery of the fixed seat 3 through the rotating rings 4 and 5 and the passage 27, the cooling seat enters the shaft sealing chamber 24 of the hollow shaft 10 through the communication hole 21 of the hollow shaft 10, and passes through the passage 25 of the cover 17. Is discharged through.

In this way, the present shaft sealing device can seal each shaft gap even if the inner shaft and the hollow shaft rotate independently and freely.

In addition, such a shaft sealing device can be realized by applying a similar structure even when there are multiple hollow shafts.

Further, in the cooling method of the shaft sealing chamber, the cooling can be effectively performed by the method described above.

〔The invention's effect〕

ADVANTAGE OF THE INVENTION According to this invention, the shaft sealing apparatus with respect to a pressure resistance and a vacuum resistance can be provided in a concentric biaxial and a concentric polyaxial.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shaft sealing device for a concentric twin shaft according to one embodiment of the present invention. 1 ... inner shaft, 2, 3, 11, 12 ... fixed seat, 4, 5, 13, 14 ... rotating ring, 10 ... hollow shaft, 20, 21 ... communication hole, 22 ... partition plate, Two
3,24 …… Shaft sealed room

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Chio Oda 502, Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. (56) References JP-A-57-124157 (JP, A) 194099 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16J 15/34

Claims (2)

(57) [Claims] 1. An inner shaft rotatable, a hollow shaft provided outside the inner shaft and rotatable independently of the rotation of the inner shaft, and each shaft being free to cover the hollow shaft. A concentric biaxial device comprising a rotatably supported main body, a mechanical seal provided between the inner shaft and the hollow shaft and between the hollow shaft and the main body, and two axially separated parts. A communication hole that communicates the shaft sealing chambers of the two mechanical seals at a position; and a partition plate that partitions the shaft sealing chamber of the hollow shaft at a position between the two axially separated positions; A coolant is supplied from outside to one of the partition spaces in the shaft sealing chamber of the hollow shaft separated by the partition plate, and the supplied cooling liquid flows into the shaft sealing chamber of the inner shaft through one communication hole, Furthermore, flow to the other of the above partition space through the other communication hole A concentric twin-screw shaft sealing device, comprising: a coolant supply / recovery means for taking coolant out of the other of the partition space. 2. An inner shaft rotatable, a hollow shaft provided outside the inner shaft and rotatable independently of the rotation of the inner shaft, and each of the shafts covering the hollow shaft, In driving a concentric biaxial device comprising a main body which is rotatably supported, a mechanical seal is provided between the inner shaft and the hollow shaft and between the hollow shaft and the main body, and the inner shaft and the hollow are provided. An inner shaft sealing chamber and a hollow shaft sealing chamber are respectively formed between the shaft and the hollow shaft and the main body, and the two shaft sealing chambers are communicated at two positions separated in the axial direction. A hole is provided, and a partition plate for partitioning the hollow shaft sealed chamber is provided at a position between the two positions separated in the axial direction. Two partitions are provided in the hollow shaft sealed chamber with the partition plate interposed therebetween. A space is formed, and a coolant is supplied to one of the partition spaces from the outside and supplied. Flowing the cooled liquid through the one communication hole into the inner shaft sealing chamber, and further flowing into the other of the partition space through the other communication hole to take out the cooling liquid from the other of the partition space to the outside. Driving method of a concentric biaxial shaft sealing device.