JPH0448375Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shaft sealing device that has flushing and cooling functions for a mechanical seal that seals the rotating shaft portion of a machine body.

[Prior art] Generally, when operating a mechanical seal,
Flushing is carried out with the main purpose of removing the heat generated by sliding on the seal sliding surface.

Conventionally, a shaft seal device incorporating this type of mechanical seal usually includes a sleeve liner 3 and a seal around the shaft of a rotating shaft 2 inserted into a seal box 1 of an aircraft body, as illustrated in FIG. A rotating ring 5, which is a rotating element, is arranged through a member 4, and a fixed ring 6, which is a stationary element, is fixed to the seal box 1 side of the machine body via an O-ring 7 and a knock pin 8. 6 so that the rotating ring 5 is in sliding contact with the rotating ring 5, the rotating ring 5 is backed up by a spring 12 via the collar 9, the spring suppressing member 10, and the knock pin 11, and the rotating ring 5 is rotated by the spring 12. Some have a structure in which the ring is biased in the direction and pressed toward the fixed ring 6 side.

A flushing mechanism in a shaft seal device equipped with such a mechanical seal, for example a shaft seal device equipped with a self-flushing mechanism, usually has a discharge port 13 facing into the seal box 1 of the machine body.
Water W to be sealed is supplied to the sliding parts of the rotating ring 5 and the fixed ring 6 to cool the sliding surfaces, and in order to stabilize the sealing performance, the entire fixed ring 6 is cooled from the outer circumferential side. That is, as a cooling mechanism, a cooling water passage 14 is formed along the circumferential direction of the outer periphery of the fixed ring 6 on the inner peripheral surface of the seal box 1 of the machine body in which the fixed ring 6 is installed,
A water inlet 15 through which cooling water is separately injected into this cooling water passage 14 is faced from the aircraft side, and this water inlet 15
Currently, the fixed ring 6 is cooled by cooling water that is separately injected from the pipe.

[Problems to be solved by the invention] However, in such a conventional shaft seal device, especially when cooling the fixed ring 6, a separate cooling water supply source is required. The piping for water supply is also separate, which not only complicates the entire mechanism, but also increases the length of the mechanism in the axial direction due to the expansion of the piping space, resulting in problems such as an increase in size.

[Purpose of the invention] The present invention was developed under the above circumstances, and its purpose is to simultaneously perform flushing and cooling of a mechanical seal with a simple configuration, thereby making the mechanism more compact. An object of the present invention is to provide a shaft sealing device that can perform the following functions.

[Means for solving the problems] In order to solve the above problems, the present invention has the following features:
The rotating shaft inserted into the seal box of the aircraft,
In a shaft sealing device in which the shaft is sealed with a mechanical seal consisting of a rotating ring and a fixed ring that is in sliding contact with the rotating ring, a mechanical seal that extends in the circumferential direction between the fixed ring and a housing on its outer periphery and is used to supply cooling water to the aircraft body. A configuration in which a cooling water passage is formed that communicates with the section or the reflux section, and this cooling water passage is communicated with the outer circumferential space of the sliding surfaces of the rotating ring and the fixed ring in the seal box through a required number of communication ports. That is.

[Function] In other words, the present invention has the above-mentioned configuration, so that the flushing that cools the sliding surfaces of the stationary ring and the rotating ring and the cooling that cools the entire stationary ring from its outer circumferential side are performed in the seal box. Water to be sealed is distributed between the cooling water passages on the outer periphery of the sliding surface and the outer periphery of the fixed ring through the communication port, and the flushing and cooling described above can be performed simultaneously with a single piping system. The directional space is also shortened and the mechanism can be made compact, thereby making it possible to stabilize the sealing performance over a long period of time.

[Examples] The present invention will be described below with reference to the embodiments shown in FIGS. 1 to 3. In the illustrated embodiment of the present invention, parts having the same structure as those of the conventional shaft sealing device shown in FIG. 4 are denoted by the same reference numerals, and a description thereof will be omitted.

FIGS. 1 and 2 schematically show a first embodiment of the shaft sealing device according to the present invention. In the shaft sealing device equipped with a self-flushing mechanism, 16, a cooling water passage 14 is formed which extends in the circumferential direction and has a water inlet 15 that extends from the impeller side (not shown). The cooling water passage 14 is connected to the outer circumferential space 1a of the sliding surface S of the rotating ring 5 and the fixed ring 6 in the seal box 1 through a communication port 20 cut out at one location in the circumferential direction of the housing 16. The communication port 20 and the water inlet 15 are separated by a dam 21. That is, after the water to be sealed W supplied through the water inlet 15 is circulated in the circumferential direction in the cooling water passage 14 to cool the fixed ring 6, it is passed from the communication port 20 to the seal box on the rotary ring 5 side of the machine body. 1, the sliding part of the mechanical seal can self-flush.
This enables self-flushing of the sliding portion of the mechanical seal and cooling of the fixed ring 6 at the same time.

FIG. 3 shows a second embodiment of the present invention, in which a shower flushing mechanism different from the self-flushing mechanism in the first embodiment is used, in which the sliding part of the mechanical seal is moved in the circumferential direction. In a device configured to uniformly cool the entire circumference with the liquid to be sealed, a plurality of communication ports 20 communicating with the seal box 1 on the rotating ring 5 side of the body are cut in the circumferential direction of the cooling water passage 14. It is formed by forming a chip.

In each of the above-described embodiments, the sealing liquid injected into the cooling water passage 14 from the water inlet 15 of the machine body is configured to flow into the seal box 1 on the rotating ring 5 side through the communication port 20. However, the present invention is not limited to this, and can also be applied to a reverse flushing mechanism in which the liquid to be sealed can be injected into the seal box 1 of the aircraft from the back side of an impeller (not shown).
In this case, the liquid is made to flow into the cooling water passage 14 through the communication port 20, and is returned to the impeller side from an outlet (not shown) provided in place of the water inlet 15.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist of the invention.

[Effects of the invention] As is clear from the above description, according to the invention, flushing that cools the sliding surfaces of the stationary ring and rotating ring, and cooling that cools the entire stationary ring from its outer circumferential side, can be performed using a seal box. This can be done simultaneously by the liquid to be sealed flowing through the communication port between the space around the sliding surface and the cooling water passage around the outer periphery of the fixed ring.Moreover, it requires less piping for the own liquid. The directional space is also shortened, the mechanism can be made compact, and this has the excellent effect of stabilizing the sealing performance over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of the main part showing a first embodiment of the shaft sealing device according to the present invention, FIG. 2 is a schematic cross-sectional view of the main part of the cooling water passage section, and FIG. FIG. 4 is a schematic sectional view of a main part of a cooling water passage portion showing a second embodiment, and FIG. 4 is a schematic sectional view of a main part of a conventional shaft sealing device. 1... Aircraft seal box, 2... Rotating shaft,
5... Rotating ring, 6... Fixed ring, 14... Cooling water passage, 15... Water inlet, 20... Communication port, W... Liquid to be sealed.

Claims (1)

[Scope of utility model registration request] In a shaft sealing device in which a rotating shaft inserted into a seal box of a machine body is sealed with a mechanical seal consisting of a rotating ring and a fixed ring that slides in contact with the rotating ring, the fixed ring and a housing on its outer periphery are A cooling water passage extending in the circumferential direction between the two and communicating with the cooling water supply section or the reflux section of the airframe is formed, and this cooling water passage is fixed to the rotating ring in the seal box through a required number of communication ports. A shaft sealing device characterized in that a sliding surface of a ring communicates with an outer circumferential space.