JPS60164698A - Fan - Google Patents

Abstract

PURPOSE:To ensure emergency function by enlarging the drain port while separating a drainage ring properly from the following wall thereby collecting the leaked water without flowing into fan casing. CONSTITUTION:The drain port 23 is enlarged and a drainage ring 20 is provided while separating properly from portion (a) of bellows 21. Leaked water is blocked at the ring section 20 to drip to the drain port 23 thus to eliminate danger of flowing into the interior of casing 24. Consequently, even when sealed water has leaked through the sliding section of shaft seal unit of fan coupled to the filter train in emergency gas treating system, the fan will never stop and the emergency gas treating system will function soundly.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a blower installed at the rear of a filter train of an emergency gas treatment system that employs a water seal type shaft sealing device of a nuclear power plant, and particularly relates to In case of emergency, water seal type shaft @&
This relates to a blower in which there is a risk of water leaking from the sliding part of the blower and seal water flowing into the blower casing.

[Background of the invention]

In a nuclear power plant, the emergency gas treatment system is
This is a system that requires continuous operation for three months or more, and the operation mode for this system is to start simultaneous operation of two trains, and after confirming the soundness, operate the system as a single train. It has an operation mode that allows you to switch to another train if an abnormality occurs in the train you are running.

In this operation mode, in conventional blowers, if seal water leaks from the shaft seal, the seal water flows into the casing and submerges the impeller, tripping the motor and stopping the air blow*'. There is.

There is a drawback that the emergency gas processing system is stopped from the above until switching to another system.

[Purpose of the invention]

The purpose of the present invention is to stop the leakage water from the sliding part of the water-sealing type shaft sealing device that is transmitted along the shaft of the blower at any point, and to stop the total amount of leakage water t.
To provide a blower equipped with a water-seal type shaft seal that discharges water from a drain outlet of a single-shaft seal device and does not cause a system shutdown even if water leaks from the blower shaft seal part in an emergency. It is in.

[Summary of the invention]

The leakage water casing inflow prevention device*h of the present invention is a water-sealing type shaft sealing device with a draining ring installed on the shaft side of the drain outlet to stop the leakage water transmitted through the shaft and allowing the leakage water to drain into the water-sealing type shaft sealing device drain. Make it large so that leaked water can easily overflow by making a long hole etc. so that it can be easily drained from the outlet. Also, install a U seal on the drain line from the drain outlet,
This prevents fluid (gas) inside the machine from flowing out from the drain line.

[Embodiments of the invention]

FIG. 1 is a diagram of a ventilation fan according to the present invention.

In the figure, 1 is a tank, which is removably fixed to a frame firmly fixed to a wall with bolts (not shown), and is connected to a shaft sealing device unit 8 through a water supply pipe 2 and a drainage pipe 3. linked. 9 is a bearing unit, base 1
2, and supports it so that it can rotate about 15 degrees. llt coupling, one side to shaft 15-,
The other one is fixed to the motor 11 by a key (not shown) or the like, and transmits the rotational force of the motor 11 to the shaft 15. 6 is a suction port of the blower 22, and 7 is a discharge port of the blower 22.

Next, the functions shown in FIG. 1 will be explained. A shaft 15 is rotated by an electric motor 11 via a coupling 10. axis 15
An impeller (not shown) is fixed to the shaft 1.
It is rotated by 50 revolutions, and the slag is sucked in from the suction port 6, and the pressure is increased, and the waste is exhausted from the discharge lower. In this case, the suction gas will leak from the shaft penetration part 1 when the pressure is increased, so to prevent this,
A shaft sealing device unit 8 is provided in the shaft penetrating portion to prevent leakage. Since this shaft sealing device unit 8 has a sliding part as will be described later, in order to cool this sliding part, cooling water from the tank 1 is guided inside the shaft sealing device unit 8 through a water supply pipe 2 to cool the sliding part. The remaining water is returned to the tank 1 through the drain pipe 3 and radiates heat. A link is created in the shaft sealing device unit 8.
If the drain line 4 is sealed with seal water,
The water flows out from the drain funnel 5 and is drained into the drain funnel 5. −
2 is a sectional view of the shaft sealing device unit 8.

In the figure, the shaft 15 is fixed to the shaft 15 with a 16Vi sleeve.
rotate at the same time. A partial impeller 17 is fixed to the shaft 15 so as to circumscribe the shaft 15 and rotate together with the sleeve 16 at the same time as the shaft 15. 18 is a bellows, one end of which is fixed to the casing 24 with a bolt, the other end of which contacts the partial impeller 17, and the sliding part 1
9. 20 is Mizukiri Schilling and sleeve 16
Welded or fixed with a suitable adhesive. A bellows 21 is fixed by a bolt between the casing 24 and a fan casing (not shown).

23 is a drain port provided in the flange portion of the casing 24. Next, the function shown in FIG. 2 will be explained. As the shaft 15 rotates, the sleeve 16
, Mizukiri shilling 20. Partial impeller 17 rotates. At this time, the sliding portion 19 generates heat due to frictional heat. However, the partial impeller 17 that rotates simultaneously with the shaft 15
By the action of the pump, cooling water is sucked in through the water supply port 13 and drained through the drain port 14, and the water inside the casing 24 is circulated to absorb the above-mentioned heat generation and cool it down. When cooling water leaks from the sliding part 19 and flows toward the water drainer sill 2o, centrifugal force accompanying the rotation of the water drainer sill 2o causes the casing 2 to leak.
4 side, the leaked water is discharged through the drain port 23 and drained from the drain line 4 to the drain 7 channel 5 in FIG.

FIG. 3 is a detailed view of section A in FIG. 2. In the figure, part A is a notch provided in the bellows 21, which is provided to increase the gap BIIl- between the bellows 21 and the draining ring 20. The leaked water flows toward the drainage sill, where it is dammed up and drained to the drain line 4 communicating with the drain hole 23. However, if the gap between the kidney part of the water cutter and the bellows 21 is narrow, the capillary phenomenon between the water cutter and the bellows 21 will cause the bellows 21 to become narrower. l
-The leakage water flows out towards the casing. 8
The dimension needs to be at least the dimension of the gap C between the outer diameter of the drainage ring 20 and the casing 24.

FIG. 4 is a view taken along line D--D in FIG. 3. This figure shows the shape of the drain port 23. By increasing the length as shown in the figure, the cross-sectional area of the leakage receiver can be increased without increasing the axial hole size.

As detailed above, the drain port should be made large and the drain port should be 9
By appropriately separating the ring from the trailing wall, leaked water can be collected without flowing into the fan casing and being rebuilt, resulting in a blower that can ensure full functionality in an emergency.

〔Effect of the invention〕

(11) In the case of conventional blowers, the hole in the drain outlet of the shaft sealing device was small, so if seal water leaked from the shaft sealing device, it could not be collected from the drain outlet and overflowed, but with this blower, the drain outlet It is now possible to collect leaked water at the exit.

(2) Due to the installation of a drainage ring on the shaft, in conventional blowers there was a risk that leakage water from the shaft sealing device would flow through the shaft and into the casing, but with the present invention,
Leakage water is blocked at the drainage ring, and there is no danger of it falling into the drain outlet and flowing into the casing.

(31 Effects of the invention (11, (21) Even if seal water leaks from the sliding part of the shaft seal unit of the blower connected to the filter train of the emergency gas treatment system. It is possible to maintain the integrity of the emergency gas processing system without stopping it.

[Brief explanation of drawings]

Fig. 1 is a side view of the ventilation fan according to the present invention, Fig. 2 is a sectional view of the mechanical seal unit 8, Fig. 3 is a detailed view of section A in Fig. 2, and Fig. 4 is a section D-DH in Fig. 3. It is an arrow view. 1... Tank, 2... Water supply pipe, 3... Drain pipe, 4... Train line, 5... Drain funnel, 6... Suction port, 7... Discharge port, 8... ...Shaft sealing device unit, 9...Shaft party, unit, 1o...Coupling, 11...Mode 1', 12...Base, 1
3... Water supply port, 14... Drain port, 15... Shaft, 1
6...Sleeve, 17...Partial impeller, 1
8... Bellows, work, 9... Sliding part, 20... Draining ring, 21... Bellows, 22... Ventilation fan, 23... Drain outlet, 24... Casing. Agent Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. In a blower equipped with a water seal type shaft seal 5tt-, a device is provided to prevent sealing water from flowing into the blower casing. 4! A blower with a characteristic. 2. The blower according to claim 1, characterized in that a U-seal is installed in the drain line portion of the shaft sealing device. 3. The blower according to claim 1, wherein the shape of the drain outlet of the shaft sealing device is elongated. 4.4! In the first item of the scope of permission request, a draining ring is attached to the shaft, and the outer periphery of the draining ring and its outside t are attached to the following wall.
(a) Must be installed with a gap greater than the gap between the stationary part and the stationary part.
A blower with t% characteristics.