JPH07151237A - Shaft seal device - Google Patents

Abstract

PURPOSE:To improve the reliability in the temperature monitoring for a shaft seal member and facilitate working and assembly. CONSTITUTION:A shaft seal device is constituted so that a plurality of shaft seal blocks 3 surrounding a rotary shaft 1 are arranged in the axial direction, having a shaft seal member 2 interposed, and a heat insulating plate 4 for insulating the temperature of the shaft seal block is arranged between the shaft seal blocks 3, and these elements are inserted into a housing 5. A temperature sensing part 7 is embedded at the position of the shaft seal block 3 in proximity with the shaft seal member 2, and a through hole 4b which penetrates to the housing side is formed on the heat insulating plate 4 in correspondence with the embedded position of the temperature sensing part 7. A communication hole 5a which communicate to the through hole 4b is formed on the housing 5, and a lead wire 7a connected with the temperature sensing part 7 is pulled outside, passing through the through hole 4b and the communication hole 5a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft-sealing device having a thermometer temperature-sensing portion for detecting the conduction heat of a shaft-sealing material which penetrates into the shaft-sealing portion from the axial direction.

[0002]

2. Description of the Related Art For example, in a rotor of a superconducting rotating electric machine, a shaft sealing device having a temperature detecting sensor in a shaft sealing portion is provided at an end of a rotating shaft thereof to prevent heat from entering the rotor in the axial direction. I am trying.

FIG. 5 shows the structure of such a conventional shaft sealing device. That is, as shown in FIG. 5, a plurality of ring-shaped shaft-sealing blocks 3 surrounding the outer peripheral surface 1a of the rotor shaft 1 with a shaft-sealing material 2 interposed therebetween are axially arranged, and Between each other, the shaft sealing block 3 and the shaft sealing material 2 are arranged in the axial direction.
A heat insulating plate 4 in the form of a hollow disc for suppressing heat invasion into the
These are inscribed in the housing 5 and inserted.

On the other hand, one end of the heat conducting rod 9 is brought into close contact with the shaft sealing block 3 at a position close to the shaft sealing material 2, and the other end of the heat conducting rod 9 is provided in a shaft in a hole 4a provided in the heat insulating plate 4. Insert up to the middle of the direction. Then, the thermometer temperature sensing portion 7 inserted through the heat insulating plate 4 from the housing outer peripheral surface 5b is inserted into the heat conducting rod 9
The thermometer temperature sensing unit 7 detects the heat transferred from the shaft sealing material 2 to the shaft sealing block 3 and further to the heat conducting rod 9.

[0005]

However, in the shaft-sealing device having such a structure, the thermometer temperature-sensing section 7 is used to interpose the heat-conducting rod 9 attached to the shaft-sealing block 3 in the vicinity of the shaft-sealing material 2. Since the conduction heat penetrating into the shaft sealing material 2 from the axial direction is detected, the true value of the actual measurement value of the shaft sealing material 2 desired to be measured is poor, and the heat conduction rod 9 and the shaft sealing block 3 as well as the thermometer temperature sensing. There is a problem that the heat conduction with the part 7 changes each time and the reliability is low.

Further, since it takes time to manufacture the heat conducting rod 9 and assemble the shaft sealing portion, the manufacturing cost is increased and it is economically disadvantageous. An object of the present invention is to provide a shaft sealing device which can improve the reliability of temperature monitoring for a shaft sealing material, is easy to process and assemble, and is economically advantageous.

[0007]

In order to achieve the above-mentioned object, the present invention has a plurality of shaft-sealing blocks surrounding a rotor shaft arranged axially with a shaft-sealing material interposed therebetween, and the shaft-sealing block. In a shaft-sealing device in which heat insulating plates for cutting off the temperature of the shaft-sealing block are provided between each other and these are inserted into the housing, a thermometer temperature-sensing unit is provided at a position of the shaft-sealing block close to the shaft-sealing material. And a through hole through which the heat insulating plate is pulled out toward the housing side corresponding to the buried position of the thermometer temperature sensing portion, and a through hole communicating with the through hole is provided in the housing. The lead wire connected to the thermometer temperature sensing portion is drawn out to the outside through the communication hole.

[0008]

In the shaft seal device having such a structure, since the thermometer temperature sensing portion is embedded in the shaft seal block portion adjacent to the shaft seal material, the temperature of the portion adjacent to the shaft seal material is controlled. It becomes possible to measure, and the reliability of temperature monitoring for the shaft sealing material can be improved. Also, since the lead wire connected to the thermometer temperature sensing part is pulled out through the communication hole provided in the heat insulating plate and the housing, when assembling the shaft-sealing part, the lead wire is temporarily set in the hole of the heat insulating plate. By assembling them in a state of being collectively inserted into, the lead wire is pulled out from the hole of the housing after assembling, the assembling work is facilitated, and the manufacturing cost can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of a shaft sealing device according to the present invention, and the same parts as those in FIG. 5 are designated by the same reference numerals.
In FIG. 1, reference numeral 1 denotes a rotor shaft, and a plurality of ring-shaped shaft sealing blocks 3 surrounding the outer peripheral surface 1a of the rotor shaft 1 with a shaft sealing material 2 interposed therebetween are arranged in the axial direction, and A hollow disk-shaped heat insulating plate 4 that suppresses heat from entering the shaft sealing block 3 and the shaft sealing material 2 from the axial direction is provided between the shaft sealing blocks, and these are inserted into the housing 5 so as to be inscribed therein. . In this case, the positioning pin 8 is provided so that the combined positions of the shaft sealing block 3 and the heat insulating plate 4 do not shift when they are combined.

An axial embedding hole 6 is provided in a portion of the shaft encapsulating block 3 which is close to the shaft encapsulating material 2, and a thermometer temperature sensitive portion 7 made of, for example, a thermocouple is embedded in the embedding hole 6. Further, the heat insulating plate 4 is connected to the hole 4a which is pulled out toward the rotary shaft 1 in correspondence with the embedded position of the thermometer temperature sensitive portion 7 and is connected to this hole 4a.
Moreover, a through hole 4b is formed so as to pass through in a direction orthogonal to the axial direction. Further, the housing 5 is provided with a communication hole 5a that communicates with the through hole 4b of the heat insulating plate 4. In this case, the shape of the through hole 4b provided in the heat insulating plate 4 may be any of the shapes shown in FIGS. 2 (a) to 2 (g).

Through holes 4b provided in these heat insulating plates 4
Also, the communication hole 5a provided in the housing 5 is for drawing out the flexible lead wire 7a connected to the thermometer temperature sensing portion 7 to the outside. It is also possible to roll 7a and temporarily hold it.

According to the shaft sealing device having such a structure, the thermometer temperature sensing section 7 is embedded in the embedding hole 6 provided in the shaft sealing block 3 at a position close to the shaft sealing material 2, and the temperature sensing unit 7 is embedded. A through hole 4b and a housing 5 through which the lead wire 7a connected to the warm portion 7 is removed in a direction orthogonal to the axial direction provided in the heat insulating plate 4.
Since it is drawn out to the outside of the housing through the communication hole 5a provided in the shaft sealing member 2, the temperature of the portion close to the shaft sealing member 2 can be measured, and the reliability of temperature monitoring of the shaft sealing member can be improved.

Further, since the lead wire 7a is flexible, when the shaft sealing portion is inserted into the housing 5 to cover the whole, the lead wire 7a is rounded and the through hole 4b of the heat insulating plate 4 is formed. By keeping it inside, the assembly can be performed without breaking the lead wire 7a. After the assembly, the lead wire 7a can be easily pulled out of the housing 5.

Further, when assembling the shaft-sealing block 3 and the heat insulating plate 4, a positioning pin 8 provided between them can prevent the combined position of the two from shifting.
The thermometer can be easily assembled with the temperature sensitive part protected.

FIG. 3 is a sectional view showing a second embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Here, different parts will be described. In the second embodiment, as shown in FIG. 3, one of the plug-in type connectors 7b, to which the lead wire 7a is connected, is fixed to the through hole 4b provided in the heat insulating plate 4 on the housing 5 side. After assembling the shaft sealing portion to 7b, the other plug-in type connector 7c to which the lead wire 7a is connected is coupled to take out the temperature detection signal of the thermometer temperature sensing portion 7 to the outside of the housing 5.

Even with such a structure, the same operational effect as that of the first embodiment can be obtained, and the labor for pulling out the lead wire 7a to the outside of the housing 5 can be omitted. Figure 4
3 is a cross-sectional view showing a third embodiment of the present invention, in which the same parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

In the third embodiment, as shown in FIG. 4, the through hole 4b provided in the heat insulating plate 4 and the communication hole 5a provided in the housing 5 are inclined at a predetermined angle with respect to the direction orthogonal to the axial direction. It is provided.

Even with such a structure, the same operational effects as those of the first embodiment can be obtained, and the thermometer temperature sensing unit 7 can be easily inserted and removed. In addition, it goes without saying that the present invention can be variously modified and implemented within the scope of the invention.

[0019]

As described above, according to the present invention, it is possible to improve the reliability of temperature monitoring of the shaft sealing material, and to provide a shaft sealing device which is easy to process and assemble and which is economically advantageous. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a shaft sealing device according to the present invention.

2A to 2G are views showing through holes having different shapes, which are provided in the heat insulating plate in the embodiment.

FIG. 3 is a sectional view showing a second embodiment of the shaft sealing device according to the present invention.

FIG. 4 is a sectional view showing a third embodiment of the shaft sealing device according to the present invention.

FIG. 5 is a sectional view showing a conventional shaft sealing device.

[Explanation of symbols]

1 ... Rotating shaft, 1a ... Rotating shaft outer peripheral surface, 2 ... Shaft sealing material,
3 ... Shaft seal block, 4 ... Thermal insulation plate, 4a ... Hole, 4
b ... through hole, 5 ... housing, 6 ... buried hole, 7 ...
… Thermometer temperature sensor, 8… Positioning pin.

Claims (1)

[Claims] 1. A heat insulating plate for arranging a plurality of shaft-sealing blocks surrounding a rotor shaft in an axial direction with a shaft-sealing material interposed, and for shutting off the temperature of the shaft-sealing blocks between the shaft-sealing blocks. In a shaft sealing device provided with these and inserted into the housing, a thermometer temperature sensing part is embedded in a part of the shaft sealing block adjacent to the shaft sealing material, and the thermometer temperature sensing part corresponds to the embedded position of the thermometer temperature sensing part. By providing a through hole through which the heat insulating plate is pulled out toward the housing side, a through hole communicating with the through hole is provided in the housing, and a lead wire connected to the thermometer temperature sensing portion through the through hole and the through hole. The shaft sealing device is characterized in that the shaft is pulled out to the outside.