JP3244978U - Hydrophobic device of modified turbine shaft seal fan - Google Patents

Abstract

A hydrophobic device for a shaft sealed fan of a turbine is provided. A hydrophobic device for a shaft seal fan of a turbine includes a shaft seal heater 1, a shaft seal fan, a first connecting pipe, and a second connecting pipe. A pressure switch 10 and a pressure transmitter 7 are connected, and a first shaft sealed fan 2 and a second shaft sealed fan 3 are connected to a shaft sealed heater 1 via an inlet valve 4 and a first valve 5, respectively. A second water discharge pipe 20 is added to the first water discharge pipe 19, and the pressure sampling pipe is modified into an upper arch-shaped condensing bent pipe, the highest part of which is slightly higher than the bottom water discharge port of the shaft seal fan. When the fan stops, due to the height difference, the condensed water inside the cover case can flow to the shaft seal heater, and when the machine starts the fan and runs, the steam side of the shaft seal heater is under negative pressure. Therefore, the hydrophobicity at the bottom of the fan impeller can be cleaned by the negative pressure inside the shaft seal heater. [Selection diagram] Figure 1

Description

The present utility model relates to the technical field of a hydrophobic device for a shaft sealed fan, particularly to a hydrophobic device for a shaft sealed fan of a modified turbine.

The shaft seal system of the turbine is equipped with one shaft seal heater and two shaft seal fans, and adopts a one-use, one-standby operation method to extract non-condensable gas from the shaft seal heater. By creating negative pressure in the shaft seal heater, the shaft seal return gas and leak gas from the valve stem enter the shaft seal heater to heat the condensed water and maintain operation at a slight negative pressure. Can be done.

During normal operation of the machine, one of the shaft seal fans is in operation, and the other shaft seal fan is in reserve, and the water discharge from the two shaft seal fans is currently using the direct discharge method. , that is, the shaft seal fan directly exhausts the atmosphere before starting, receives the water in a suitable container, and operates in an artificial manner, which is not only time-consuming but also easy to cause water puddles on the ground. Due to the unreasonable design, in the process of regularly switching between the two shaft seal fans, a failure occurred due to the spare shaft seal fan tripping after starting. After investigation, the cause was determined, and the fan If too much water accumulates inside the cover case, the starting current will be too large, resulting in thermal coupling action, resulting in starting failure. To complete the changeover, it is necessary to destroy the internal negative pressure environment and close the flap at its inlet before releasing water. difficult to release. In addition, if the operating shaft seal fan trips during normal machine operation, the backup fan will start in succession and then fail to start due to the problem of water accumulating inside, which will affect the reliability of the equipment. Sometimes I give.

The purpose of this utility model is to provide a hydrophobic device for a shaft sealed fan of a turbine which has been modified to solve the problems in the above-mentioned background art.

In order to achieve the above purpose, this utility model provides the following technical proposal. The hydrophobic device of the modified turbine shaft seal fan according to this technical proposal includes a shaft seal heater, a shaft seal fan, a first connecting pipe and a second connecting pipe, and on both sides of the shaft seal heater, a condensing bent pipe is provided. A pressure switch and a pressure transmitter are connected through a pressure switch, a first shaft seal fan and a second shaft seal fan are connected to a shaft seal heater through an inlet valve and a first valve, respectively, and the first shaft seal fan and the second shaft seal fan are connected to a shaft seal heater through an inlet valve and a first valve, respectively. A fan water outlet is connected to the bottom of each shaft seal fan, a second water outlet is connected between the condensing bent pipe and the fan water outlet, a second valve is connected to the second water outlet, and a second valve is connected to the second water outlet. A third valve is connected to the bottom of the shaft-sealed heater, and all of the pipes within the apparatus are connected to the second connecting pipe via the first connecting pipe.

Preferably, an upper arch segment is arranged in the condensing bend, and the highest part of the upper arch segment is slightly higher than the water outlet of the first shaft sealing fan and the second shaft sealing fan.

Preferably, a plurality of arc lock grooves are uniformly provided along the circumferential direction in the first connecting pipe, and a plurality of locking members are uniformly arranged along the circumferential direction in the second connecting pipe. and the locking member engages with the arc lock groove.

Preferably, the first connecting pipe has a plurality of seal rings uniformly arranged along the circumferential direction.

Preferably, a plurality of return springs to which presser plates are connected are arranged in the arc lock groove.

Preferably, the second valve is normally open.

The beneficial effects of this utility model are as follows.
In this utility model, a second water discharge pipe is added to the first water discharge pipe, and the pressure sampling pipe is modified into an upper arch-shaped condensing bent pipe, the highest part of which is slightly higher than the bottom water discharge port of the shaft seal fan. When the fan stops, due to the height difference, the condensed water inside the cover case can flow to the shaft seal heater, and when the machine starts the fan and runs, the steam side of the shaft seal heater is under negative pressure. Therefore, the hydrophobicity at the bottom of the fan impeller can be cleaned by the negative pressure inside the shaft seal heater. In addition, the pressure sampling tube was modified to have an upper arch-shaped condensing curved tube, so there is no water pooling in the meter and it is possible to display numerical values accurately.

FIG. 2 is a schematic structural diagram of a hydrophobic device of a shaft sealed fan of a modified turbine proposed by the present utility model. FIG. 2 is a structural schematic diagram of a first connecting pipe and a second connecting pipe of a hydrophobic device of a shaft sealed fan of a modified turbine proposed by the present utility model; FIG. 2 is a structural schematic diagram of a connection point between a first connecting pipe and a second connecting pipe of a hydrophobic device of a modified tubular shaft seal fan proposed by the present utility model; FIG. 2 is a structural schematic diagram of a cross section of a connection between a first connection pipe and a second connection pipe of the hydrophobic device of the modified tubular shaft seal fan proposed by the present utility model;

Hereinafter, the technical solution in the embodiment of this utility model will be clearly and completely explained with reference to the drawings in the embodiment of this utility model. Obviously, the described embodiments are only part of the present utility model, but not all of it.

Referring to FIGS. 1 to 4, the hydrophobic device of the shaft seal fan of the modified turbine includes a shaft seal heater 1, a shaft seal fan, a first connecting pipe 12 and a second connecting pipe 13, and includes a shaft seal heater 1 on both sides of the shaft seal heater 1. A pressure switch 10 and a pressure transmitter 7 are connected to each other via a condensing bent pipe 6, and a first shaft sealed fan 2 and a second shaft sealed fan 3 are connected to a shaft sealed heater via an inlet valve 4 and a first valve 5, respectively. 1, a fan water discharge port 11 is connected to the bottom of each of the first shaft sealed fan 2 and the second shaft sealed fan 3, and a second water discharge pipe 20 is connected between the condensing bent pipe 6 and the fan water discharge pipe. A second valve 8 is connected to the second water discharge pipe 20, a third valve 9 is connected to the bottom of the shaft-sealed heater 1, and all piping within the device is connected to the second water discharge pipe 20 through the first connection pipe 12. It is connected to the connecting pipe 13. An upper arch segment is arranged in the condensing bend, and the highest part of the upper arch segment is slightly higher than the water outlet of the first shaft sealing fan 2 and the second shaft sealing fan 3.

A second water discharge pipe 20 is added to the first water discharge pipe 19, and the pressure sampling pipe is modified into an upper arch-shaped condensing bent pipe 6, the highest part of which is slightly higher than the bottom water discharge port of the shaft-sealed fan. When the fan stops, due to the height difference, the condensed water inside the cover case can flow to the shaft seal heater 1, and when the machine starts the fan and operates, the steam side of the shaft seal heater 1 is under negative pressure. Therefore, the hydrophobicity at the bottom of the fan impeller can be cleaned by the negative pressure inside the shaft seal heater 1. In addition, the pressure sampling tube was also modified to have an upper arch-shaped condensing bent tube 6, so there is no water pooling in the meter and numerical values can be displayed accurately.

Specifically, in this embodiment, the first connecting pipe 12 has a plurality of arc lock grooves 17 uniformly formed along the circumferential direction, and the second connecting pipe 13 has a plurality of arc lock grooves 17 formed uniformly along the circumferential direction. The locking members 14 are uniformly arranged, and the locking members 14 engage with the arc lock grooves 17.

By arranging the locking member 14 and the arc lock groove 17, it is possible to easily connect the first connecting pipe 12 and the second connecting pipe 13, and the connection efficiency is improved without requiring a screw connection. be able to.

Specifically, in this embodiment, the first connecting pipe 12 has a plurality of seal rings 16 uniformly arranged along the circumferential direction.

By arranging the seal ring 16, the sealing performance of the connection between the first connecting pipe 12 and the second connecting pipe 13 can be improved.

Specifically, in this embodiment, a plurality of return springs 15 to which presser plates 18 are connected are arranged in the arc lock groove 17 .

By arranging the return spring 15 and the press plate 18, when the locking member 14 is inserted into the arc lock groove 17, the press plate 18 can be pressed and the return spring 15 can be further compressed. Thereby, the elastic potential energy of the return spring 15 can further enhance the connection stability between the first connecting pipe 12 and the second connecting pipe 13.

Specifically, in this embodiment, the second valve 8 is in a normally open state.

The above are merely preferred specific embodiments of this utility model, and the scope of protection of this utility model is not limited thereto. Any equivalent substitution or modification made based on the idea of the technical proposal and this utility model shall be included within the protection scope of this utility model.

1 Shaft sealed heater 2 1st shaft sealed fan 3 2nd shaft sealed fan 4 Inlet valve 5 1st valve 6 Condensing bent pipe 7 Pressure transmitter 8 2nd valve 9 3rd valve 10 Pressure switch 11 Fan water outlet 11
12 First connection pipe 13 Second connection pipe 14 Locking member 15 Return spring 16 Seal ring 17 Arc lock groove 18 Holding plate 19 First water discharge pipe 20 Second water discharge pipe

Claims (6)

A hydrophobic device for a shaft-sealed fan of a modified turbine, including a shaft-sealed heater, a shaft-sealed fan, a first connecting pipe, and a second connecting pipe, the hydrophobic device comprising:
A pressure switch and a pressure transmitter are connected to both sides of the shaft-sealed heater through a condensing bent pipe,
The first shaft sealed fan and the second shaft sealed fan are connected to the shaft sealed heater via an inlet valve and a first valve, respectively;
A fan water outlet is connected to the bottom of each of the first shaft sealed fan and the second shaft sealed fan,
A second water discharge pipe is connected between the condensation bent pipe and the fan water discharge pipe,
A second valve is connected to the second water discharge pipe,
A third valve is connected to the bottom of the shaft seal heater,
All of the pipes within the device are connected to the second connecting pipe via the first connecting pipe.
A hydrophobic device for a shaft sealed fan of a modified turbine, characterized by: An upper arch segment is disposed in the condensing bend, and the highest part of the upper arch segment is slightly higher than the water outlet of the first shaft sealing fan and the second shaft sealing fan.
The hydrophobic device of a shaft sealed fan of a modified turbine according to claim 1. A plurality of arc lock grooves are uniformly provided in the first connecting pipe along the circumferential direction,
A plurality of locking members are uniformly arranged along the circumferential direction of the second connecting pipe, and the locking members engage with the arc lock grooves.
The hydrophobic device of a shaft sealed fan of a modified turbine according to claim 1. The first connecting pipe has a plurality of seal rings uniformly arranged along the circumferential direction.
The hydrophobic device of a shaft sealed fan of a modified turbine according to claim 3. A plurality of return springs to which a presser plate is connected are arranged in the arc lock groove.
The hydrophobic device of a shaft sealed fan of a modified turbine according to claim 3. the second valve is in a normally open state;
The hydrophobic device of a shaft sealed fan of a modified turbine according to claim 1.

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