JP2636545B2 - Vertical shaft pump bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for a vertical shaft pump, and more particularly, to a vertical shaft pump of a type in which idle operation is performed in a control operation, a preliminary standby operation, and the like.

[0002]

2. Description of the Related Art There are two types of bearings for vertical shaft pumps: a type using a rubber bearing as shown in FIG.

[0003] In the former, water is always required during operation, and the pump cannot be operated if the water is supplied. In addition, water supply is always required during operation, which is uneconomical.

[0004] The latter is capable of dry start at start-up and has good sliding characteristics, and has many advantages. However, the possible time of dry operation is limited to a short time at start-up, and continuous idle operation such as management operation or preceding standby operation is not possible. And the range of use was limited.

The prior art of this type is disclosed in
No. 7,163,198.

[0006]

In the prior art described above, there is a problem that the lubricating water must be constantly supplied to the pump which performs the continuous idling operation such as the management operation and the preceding standby operation.

It is an object of the present invention to provide a vertical shaft pump that performs a continuous idling operation such as a management operation or a preceding standby operation, and can cope with only initial water injection.

[0008]

In order to achieve the above object, according to the present invention, a shaft seal portion is provided at both ends of a bearing of a vertical shaft pump, and the shaft seal portion and the bearing portion are joined by a protective pipe to form a water sealing portion. The bearing was constructed so that it could always be exposed to water.

Further, by connecting the water-sealing portion and a water-sealing tank installed on the ground portion with a water-sealing pipe, it is possible to cause a slight leakage from the shaft-sealing portion to supply the water.

Another feature of the present invention is that an automatic water supply device is provided in the water sealing tank to more reliably supply leakage from the shaft sealing portion.

Still another feature of the present invention resides in that water is injected from the head tank in the vicinity of the upper shaft sealing portion to more reliably supply leakage from the shaft sealing portion.

Still another feature of the present invention is that a drain line is provided above the water sealing tank, a hole is made in a protective pipe below the drain line outlet, and the water is pumped by itself during normal drainage operation. Lubricating water can be supplied and circulated.

Still another feature of the present invention is that a water sealing tank is provided above the upper shaft sealing portion so that the upper shaft sealing portion can be reliably lubricated.

Still another feature of the present invention is that the bearing sliding member is made of a hard material such as ceramics and a super hard material, so that the service life is prolonged and pumping water containing slurry as lubricating water can be used. .

Still another feature of the present invention is that the non-contact shaft sealing device is not required or the upper shaft sealing device is not required so that idling can be performed without considering lubrication of the upper shaft sealing device.

Still another feature of the present invention resides in that the bearing device as described above is incorporated in a vertical shaft pump, so that a continuous idling operation during a supervision operation and a preceding standby operation can be performed only by initial water injection.

[0017]

According to the present invention, since the bearing portion has a structure that is constantly immersed in water as described above, there is no seizure phenomenon and no heat crack during dry operation as seen in a hard material bearing. Idling operation can be performed.

Further, by providing the water-sealing tank with an automatic water-supplying device, water is automatically supplied from the water-supplying device even in the event of leakage from the shaft sealing portion, so that a structure can be realized in which the bearing portion is surely soaked in water. .

Further, since water is always supplied from the head tank to the vicinity of the upper shaft sealing portion, a structure can be realized in which the bearing portion is surely soaked even if leakage occurs from the shaft sealing portion.

In addition, a drain line is provided above the water sealing tank, and a hole is made in the protective pipe below the outlet.

[0021] Thus, the bearing lubrication water can be circulated by taking in the pumping water from the hole of the protection pipe during the draining operation and draining it through the drain line of the water sealing tank, and also at the time of the idling operation. It is possible to store water up to the vicinity of the hole of the pipe, so that the bearing can always be immersed in water.

Further, by arranging the water sealing tank above the upper shaft sealing portion, the lubricating water in the water sealing tank can be diverted to the lubrication of the upper shaft sealing portion, and the upper shaft sealing portion is also always used as water. It becomes a structure that can be used.

Further, since the wear resistance is improved by using a ceramic and a super-hard hard member for the bearing member, the life can be extended. Also, even if slurry is contained in its own pumping, the bearing member is hard to wear because it is hard, so it can be taken in as lubricating water, and there is no need to supply fresh water from others.

In addition, since the upper shaft sealing portion does not require lubrication of the upper shaft sealing device by making the upper shaft sealing portion or the exhaust contact shaft sealing device unnecessary, the above-described structure can be achieved with a simple structure. Become.

As described above, since the bearing is always soaked in water, the continuous idling operation during the supervision operation and the preliminary standby operation can be performed only by initial water injection.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, a suction bell 3 of the pump casing is connected to a lower side of a casing liner 2 of the pump casing containing the impeller 1, and a pump pipe 5 and a discharge pipe, which are a part of the pump casing, are connected to the upper side. Elbow 6
Are connected to form a vertical shaft pump.

The pump rotor is supported by bearings 7a and 7b, and shaft seal devices 8 and 9 are provided below the lower bearing 7a and above the upper bearing 7b, respectively.

The lower shaft sealing device 8 is a contact-type shaft sealing device in which the amount of leakage is suppressed, for example, a mechanical seal is used. The upper shaft sealing device 9 is a non-contact type shaft sealing device, for example, a labyrinth seal is used.

The bearing and the shaft sealing device are provided with a protective pipe 10a,
10b, and the water sealing portions 11a, 11b, 11c including the pump casing 4 are formed.

The water sealing section 11a passes through the guide blades of the casing 4 and is connected to a water sealing tank 12 via a water sealing pipe 13.

Now, when water is initially injected from the water sealing tank 12, the water is transferred from the water sealing tank 12 to the water sealing pipe 13 to the water sealing chamber 1.
1a → gap between lower bearing 7a and sleeve → water sealing chamber 11b
→ The gap between the upper bearing 7b and the sleeve → the water sealing chamber 11c.

Since the upper shaft sealing portion 9 is a labyrinth seal, air escapes in the above process, and atmospheric pressure is applied to the water sealing chamber. Therefore, the water surface of the water sealing tank 12 and the water surface in the water sealing chamber become the same. From this, the level of the water gauge 14 of the water sealing tank 12 is monitored, and if the level is within the range of the water gauge 14, the sliding surfaces of the bearings 7a and 7b and the lower shaft sealing portion 8 are always in a state of water. Continuous operation is possible even in idling operation.

Also, even if water leaks slightly from the lower shaft seal 8, the water level gauge 14 is monitored, and if the water level falls below the water level gauge, water may be supplied.

In the idle operation, water leaks, but in the drain operation, the pump discharge pressure is higher than that in the water sealing chamber. Is considered long.

FIG. 2 shows a ball tap 15 provided in the water sealing tank 12 of the bearing device of the pump of FIG. 1, a pipe from a water supply source connected to the water sealing tank 12, and an electromagnetic valve 16 provided at the inlet thereof. This is to ensure that replenishment is possible for leaks from the parts.

FIG. 3 shows the same basic structure as that of FIG. 1 except that water is stored in the head tank 19 and head pressure is constantly applied from the vicinity of the upper shaft sealing portion 9 to reduce the amount of leakage from the shaft sealing portion. Since the water is supplied, the water sealing chambers 11a, 11b, and 11c are always filled with water, and the sliding surfaces of the bearings 7a, 7b, the lower shaft sealing portion 8, and the upper shaft sealing portion 9 are in a state of water. Continuous operation is possible.

FIG. 4 shows the same basic structure as that of FIG. 1, except that a drain pipe 18 is provided above the water sealing tank 12, and a small hole 17 is provided in the protective pipe 10b at a position below the outlet of the drain pipe 18. Open. The bearings 7a and 7b are ceramic bearings, and the sleeve is made of cemented carbide.

If the initial water injection is carried out in the same manner as in the embodiment of FIG. 1, the water level in the water sealing chamber enters the vicinity of the small hole 17 of the protection pipe 11c, so that the bearings 7a and 7b and the lower shaft sealing portion 8 are provided as in the embodiment of FIG. Is always in a state of water, and continuous operation is possible even in idling operation.

In the drainage operation, the protection pipe 1
Since the pumping water enters through the small hole 17 of the nozzle 0b, the pressure causes the water to be removed. The lubricating water circulates from the water pipe 13 → water sealing tank → drain pipe 18 → pump pit and circulates, and fresh water is always supplied to the water sealing chamber. Since the bearing and the sleeve use ceramic and cemented carbide, they can be used even if slurry is combined with the pumping water.

FIG. 5 also has the same basic structure as that of FIG. 1 except that a water sealing tank 12 is provided on the upper shaft sealing portion 9. In this embodiment, since the upper shaft sealing portion is also always immersed in water, use of a contact type shaft sealing device is also conceivable.

As described above, according to the present invention, it is possible to realize a vertical shaft pump capable of performing a continuous idling operation during a management operation or a preliminary standby operation only by initial water injection.

[0043]

According to the present invention, it is possible to realize a vertical pump capable of performing continuous idling operation at the time of management operation or standby operation and continuous operation at the time of normal drainage only by initial water injection.

[0044]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a bearing device of a vertical shaft pump according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a bearing device for a vertical shaft pump according to a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a bearing device of a vertical shaft pump according to a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a bearing device of a vertical shaft pump according to a fourth embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a bearing device for a vertical shaft pump according to a fifth embodiment of the present invention.

FIG. 6 is a vertical sectional view showing an example of a bearing device of a conventional vertical shaft pump using a rubber bearing.

FIG. 7 is a longitudinal sectional view showing another example of a bearing device for a conventional vertical shaft pump using a waterless bearing.

[Explanation of symbols]

1 impeller, 2 casing liner, 3 bellmouth,
4 casing, 5 pumping pipe, 6 discharge elbow, 7
Bearing: 8: Lower shaft sealing portion, 9: Upper shaft sealing portion, 10: Protective pipe, 11: Water sealing chamber, 12: Water sealing tank, 13: Water sealing pipe, 14: Water level gauge, 15: Ball tap, 16 ... Solenoid valve, 17: small hole, 18: drain pipe, 19: head tank.

Claims (1)

(57) [Claims] In a bearing device of a vertical shaft pump, a shaft sealing portion is provided at both ends of a bearing, and a water sealing portion is formed by connecting the shaft sealing portion and the bearing with a protection pipe, and the water sealing portion and a sealing portion on a ground portion. Connect the water tank with a sealing pipe, and arrange a drain above the sealing tank.
Provide a pipe and place it below the drain pipe outlet.
A bearing device for a vertical shaft pump, wherein a hole is formed in a protective pipe .