JP3223767B2 - Shaft sealing device for vertical shaft pump - Google Patents

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 for a vertical shaft pump in which a sliding surface is lubricated with self-held lubricating water.

[0002]

2. Description of the Related Art An end face type ceramic shaft sealing device using ceramics having excellent wear resistance has been used as a sealing member in a shaft sealing device of a vertical shaft pump for draining rainwater.

On the other hand, due to the rapid urbanization in recent years, the inflow of rainwater into drainage stations has become large and rapid, and in order to cope with such a situation, the necessity of operating the drainage pump in advance standby operation has been increased. ing. However, a vertical shaft drain pump that performs aerial operation typified by such a preliminary standby operation has an in-air operation state in which the pump is started and the main shaft is rotating but the pump is not pumped for as long as 30 minutes or more. For some time. During this time, lubricating water will not be supplied to the shaft sealing device, and the lubricating water held by the shaft sealing device for lubrication of the sliding surface will be insufficient, and abnormal wear due to dry sliding will occur. However, it is difficult to employ a ceramic shaft sealing device.

As this type of shaft sealing device, there is one described in Japanese Patent Application Laid-Open No. 7-12236.

[0005]

The conventional shaft seal device for a vertical shaft pump has a structure in which the pumped water is stored in a rotary container as lubricating water. There is a lack of consideration to reduce the consumption of the lubricating water so as to withstand a long-time aerial operation.

An object of the present invention is to provide a shaft sealing device for a vertical shaft pump that can increase the amount of lubricating water retained and effectively use the lubricating water to withstand long-term in-air operation.

[0007]

According to the present invention, there is provided a rotary cylinder having a lubricating water holding chamber surrounding the outer circumference of a seat ring and a seal ring which are sliding members for sealing a shaft. A return channel extending from the inner peripheral edge of the return plate toward the outer peripheral portion and opening toward the inside of the rotary cylinder is formed on the return plate protruding from the upper edge to cover the upper opening of the rotary cylinder. Features.

[0008]

The lubricating water holding chamber holds a large amount of lubricating water around the seat ring and the seal ring, and suppresses lubricating water scattered from the upper opening by centrifugal force during rotation by a return plate. The lubricating water that is leaking from the inner peripheral edge of the plate is returned to the inside of the lubricating water holding chamber by the centrifugal pump action of the return channel.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The shaft sealing device for a vertical shaft pump in this embodiment is a shaft sealing device in which the sealing member is made of ceramics (hereinafter, referred to as a ceramic shaft sealing device), and a drainage device that performs a preliminary standby operation (aerial operation) to drain rainwater. Mounted as a shaft seal device for a pump .

FIG. 1 is a vertical sectional side view of a shaft drainage pump shaft sealing device according to the present invention. This shaft sealing device is a device for preventing fluid from leaking from a gap between the main shaft 1 and the pump casing 7. A flange 2 is fixed to the main shaft 1, and a case 3a to which a seat ring 4 is attached is fixed to an upper surface of the flange 2. The case 3b holding the seal ring 5 which is pressed against and slides on the seat ring 4 is screwed to the seal case 6 and fixed detachably. Spindle 1
An annular cover 8 is attached to the upper end of a pump casing 7 provided so as to surround the flange 2 and the seal case 6. The seal case 6 is water-tightly and vertically slidable on the inner peripheral end of the annular cover 8 via an O-ring 9. Movably mounted. The coil spring 10 presses the seal case 6 so as to press the seal ring 5 against the seat ring 4. Reference numeral 13 denotes a dust cover extending from the inside of the seal case 6 so as to cover the coil spring 10 and the sliding portion between the seal case 6 and the annular cover 8.

The rotating cylinder 11 erected from the outer peripheral end of the flange 2 so as to surround the outer peripheral sides of the cases 3a and 3b supporting the seat ring 4 and the seal ring 5 and the seal case 6 is fixed by a pump. Lubricating water holding chamber 1 for storing the raised pumping liquid and holding it as lubricating water
1a is formed. The lubricating water held in the lubricating water holding chamber 11a is rotated by the centrifugal force caused by the rotation of the main shaft 1 to rotate the rotating cylinder 11
The annular return plate 12 protrudes inward from the upper edge of the rotary cylinder 11 and extends close to the outer peripheral surface of the seal case 6 to cover the upper opening in order to suppress scattering from the upper opening of the rotary cylinder 11. Is provided. The return plate 12 is formed with a return water passage 14 extending from the inner peripheral edge toward the outer peripheral portion and opening toward the lubricating water holding chamber 11a. Fifteen
Is an annular guide wall provided inside the opening of the return water passage 14 toward the lubricating water holding chamber, and the lubricating water returned from the return water passage 14 into the lubricating water holding chamber 11a is provided on the inner wall surface of the rotary cylinder 11. Orient so that it flows down along.

In this vertical shaft drain pump shaft sealing device, at the time of pumping, the pump casing 7 is filled with pumped liquid, and the pumped liquid that has passed through the rotary cylinder 11 is sealed with the seal case 6 and the return plate 12.
The lubricating water enters the lubricating water holding chamber 11a through the gap between the inner peripheral edges of the lubricating water holding chamber 11a and is stored, and becomes lubricating water for lubricating the sliding surfaces of the seat ring 4 and the seal ring 5. The lubricating water (leakage) that has passed from the outer peripheral side to the inner peripheral side while lubricating the sliding surface rises in a gap formed between the outer peripheral surface of the main shaft 1 and the inner peripheral surface of the seal case 6, and the dust cover 13 It overflows to the upper surface and flows to the outer peripheral side on the upper surface of the annular cover 8. The earth and sand particles contained in the water leak are carried together with the leaked fluid, so that they do not enter the sliding surface between the seal case 6 and the annular cover 8 and damage the O-ring 9.

When the pumping is completed, the water in the pump casing 7 drops, but the lubricating water holding chamber 1 surrounded by the rotary cylinder 11
The pumping liquid is stored in the inside 1a up to the level of the upper surface of the return plate 12 and held as lubricating water. The lubricating water holding chamber 11
The arrow in a indicates the circulation direction of the pumped liquid (lubricating water) in the lubricating water holding chamber 11a while the drain pump is rotating.

This vertical shaft drain pump shaft sealing device supplies the lubricating water for the first in-air operation to the lubricating water holding chamber 11a at the end of the new assembling operation. The pumping liquid is automatically replenished and self-maintained as lubricating water, and the sliding surfaces 4 and 5 are lubricated with the lubricating water. A case 3a for supporting the seat ring 4 and the seal ring 5,
The lubricating water holding chamber 11a formed by the rotating cylinder 11 erecting from the outer peripheral end of the flange 2 so as to surround the outer peripheral side of the seal case 6 and 3b has a relatively large capacity to hold a large amount of lubricating water. Can be.

The lubricating water stored in the lubricating water holding chamber 11a rotates together with the main shaft 1 when it rotates, and rises along the inner wall surface of the rotary cylinder 11 by its centrifugal force. The lubricating water that has risen is pressed by the return plate 12 and returned downward. However, a part of the lubricating water in the upper part is pushed out by the water rising from the lower part, flows along the return plate 12, overflows from the gap between the inner peripheral edge of the return plate 12 and the seal case 6, and The return water passage 14 opening at the outer peripheral edge of the return plate 12 sucks the lubricating water and returns to the lubricating water holding chamber 11a by the centrifugal force to pump the lubricating water. Spouts downward so as to suppress the rise of lubricating water that rises along.

Therefore, the lubricating water in the lubricating water holding chamber 11a is less likely to be scattered and wasted, so that reliable lubrication can be maintained for a long period of in-air operation, and more reliable. Shaft seal device having a high height can be realized.

Next, a return channel 14 formed in the return plate 12
Will be described with reference to FIGS.

In the embodiment shown in FIG. 2, an annular gap 14a of about 5 mm opening in the inner peripheral edge of the return plate 12 is formed in the middle part of the return plate 12 in the thickness direction, and the wall surface of the rotary cylinder 11 in the gap 14a is formed. A plurality of holes 14b are formed in the lubricating water holding chamber 11a at a location close to the hole. The holes 14b may be formed with approximately eight round holes having a diameter of about 5 mm at equal intervals.

In the embodiment shown in FIG. 3, a plurality of round holes 14c formed radially at equal intervals from the inner peripheral edge of the return plate 12 to the outer peripheral portion are provided near the wall surface of the rotary cylinder 11 in the lubricating water holding chamber 11a. The lubricating water holding chamber 11
It is opened downward toward a.

In the embodiment shown in FIG. 4, a plurality of round holes 14 are formed at equal intervals from the inner peripheral edge of the return plate 12 to the outer peripheral portion.
d is curved in the direction of rotation of the pump and curved toward the lubricating water holding chamber 11a near the wall surface of the rotary cylinder 11, thereby opening obliquely downward in the rotating direction toward the lubricating water holding chamber 11a. is there.

By doing so, the return water spouting from the round hole 15d into the lubricating water holding chamber 11a can more effectively suppress the rise of the lubricating water in the lubricating water holding chamber 11a.

FIG. 5 is a vertical sectional side view showing another embodiment of the vertical shaft drainage pump shaft sealing device according to the present invention. In this shaft sealing device, a step member 16 is provided in a gap between the seal case 6 and the inner peripheral edge of the return plate 12, and lubricating water to pass through the gap is sucked into a return water passage 14 formed in the return plate 12. It is easy. Other configurations are the same as those of the above-described embodiment, and thus the same reference numerals are given and the duplicate description will be omitted.

In this embodiment, the return water passage 14 is provided with a stepped return plate 12
It opens facing the step part of the inner peripheral edge of. Therefore, the lubricating water that tends to leak along the step member 16 is easily sucked into the return water passage 14.

FIG. 6 is a vertical sectional side view showing still another embodiment of a shaft drainage pump shaft sealing device according to the present invention. In this shaft sealing device, an auxiliary container 17 fixed to the seal case 6 is provided concentrically in the lubricating water holding chamber 11a. Other configurations are the same as those of the embodiment shown in FIG. 1, and thus the same reference numerals are given and duplicate explanations are omitted.

The auxiliary container 17 has an open top and a bottom provided with a lubricating water holding chamber 11a through a communication hole (not shown).
And an auxiliary chamber 17a communicating with the lubricating water holding chamber 11a.
A part of the lubricating water is held in the auxiliary chamber 17a so as not to rotate. The return water passage 14 is provided in the lubricating water holding chamber 1.
The opening 1a opens downward toward the gap between the rotary cylinder 11 and the auxiliary container 17.

The auxiliary container 17 in this embodiment partitions the inside of the lubricating water holding chamber 11a to hold a part of the lubricating water so that it does not rotate. 17, the return water from the return water passage 14 is blown out to the clearance to suppress the rise of the lubricating water, so that the lubricating water can be more effectively prevented from scattering.

[0027]

According to the present invention, a ceramic is used as a sealing member.
In a shaft seal device for a vertical pump using a shaft , a large amount of lubricating water is held by a lubricating water holding chamber formed around the seat ring and the seal ring .
As a result, lubricating water scattered from the upper opening is suppressed by the return plate, and the lubricating water to leak from the inner peripheral edge of the return plate is pushed back to the inside of the lubricating water holding chamber by the centrifugal pump action by the return water channel. Therefore, the lubricating water can be effectively used to realize water lubrication that can withstand long-time aerial operation.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a shaft drainage pump shaft sealing device according to the present invention.

FIG. 2 is a perspective sectional view showing one embodiment of a return water passage formed in a return plate in the vertical shaft drain pump shaft sealing device according to the present invention.

FIG. 3 is a perspective sectional view showing another embodiment of the return water passage formed in the return plate in the vertical shaft drain pump shaft sealing device according to the present invention.

FIG. 4 is a perspective sectional view showing still another embodiment of a return water passage formed in a return plate in the vertical shaft drainage pump shaft sealing device according to the present invention.

FIG. 5 is a vertical sectional side view showing another embodiment of the shaft drainage pump shaft sealing device according to the present invention.

FIG. 6 is a vertical sectional side view showing still another embodiment of the shaft drainage pump shaft sealing device according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Spindle, 2 ... Flange, 3a, 3b ... Case, 4 ... Seat ring, 5 ... Seal ring, 6 ... Seal case, 7
... Pump casing, 8 ... Cover, 9 ... O-ring, 10
... Coil spring, 11 ... Rotary cylinder, 11a ... Lubricant holding chamber,
12 ... return plate, 14 ... return channel.

────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Yoshiaki Chiba 502 Kandachicho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hitachi, Ltd. (56) References JP-A-7-1236 (JP, A) JP-A-62- 176970 (JP, A) Japanese Utility Model Showa 62-195698 (JP, U) Japanese Utility Model Showa 48-28987 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16J 15/34 F04D 13 / 00 F04D 29/00-29/16 F04D 31/00-35/00

Claims (4)

(57) [Claims] 1. A shaft for a vertical shaft pump comprising a main shaft, a flange fixed to the main shaft to support a seat ring, and a seal ring supported by a seal case and in contact with the seat ring, wherein ceramic is used for a seal member. In the sealing device, a rotating cylinder that is attached to the flange and stands up to surround the outer circumferences of the seat ring and the seal ring to form a lubricating water holding chamber, and an upper opening of the rotating cylinder from an upper edge of the rotating cylinder. and the deflector projecting so as to cover, extending toward the outer periphery from the inner periphery of該返to plate provided waterway return opens toward the inside of the rotary cylinder, the flashing plate, the return water passage Jun
Return water spouted from the opening inside the sliding water holding chamber side opening
A shaft sealing device for a vertical shaft pump, comprising a guide wall for directing . 2. A flange provided on an outer periphery of a main shaft of a vertical shaft pump, a seat ring fixed to a case fixed to the flange, a pump casing provided to surround the main shaft and the flange, and a pump casing provided on the pump casing side. A seal case, a seal ring attached to a case fixed to the seal case, and elastic means for pressing the seal ring against the seat ring surface, and a shaft sealing device for a vertical shaft pump using ceramics for a seal member. A rotating cylinder fixed to the flange so as to surround the outer peripheries of the case and the seal case to form a lubricating water holding chamber;
A return plate provided on the upper edge of the rotary cylinder to suppress the rise of the lubricating water rising along the inner wall of the rotary cylinder; and a return plate formed to extend from the inner peripheral edge to the outer peripheral portion of the return plate. A return channel is provided for sucking lubricating water to leak from the inner peripheral edge and returning the lubricating water to the lubricating water holding chamber .
Return water spouted from the lubricating water holding chamber side opening
A shaft sealing device for a vertical shaft pump, comprising a guide wall for orienting the shaft. 3. A main shaft and a seat ring fixed to the main shaft.
And a flange that is supported by a seal case.
A seal ring that comes in contact with the seat ring
For vertical shaft pumps using ceramics
And is attached to the flange and
Lubrication water holding chamber
A rotating cylinder that forms
Return plate protruding so as to cover the opening, and an inner periphery of the return plate
Extending from the edge toward the outer periphery toward the inside of the rotary cylinder
Rainwater drainage with an open return channel and pre-standby operation
A shaft sealing device for a vertical shaft pump used for a pump. 4. A flange provided on an outer periphery of a main shaft of a vertical shaft pump.
And the sheet attached to the case fixed to this flange
A ring and a pump provided to surround the spindle and the flange.
Pump casing and a seal provided on the pump casing side.
Case and the case fixed to this seal case.
The seal ring attached, and the seal ring
And elastic means for pressing against the ring surface.
In a shaft seal device for a vertical shaft pump using Lamix, the two cases and the seal case are surrounded so as to surround the outer circumference of the seal case.
A rotating cylinder fixed to the flange to form a lubricating water holding chamber;
Along the inner wall of the rotating cylinder
A return plate for suppressing the rise of lubricating water,
It is formed so as to extend from the peripheral edge to the outer peripheral portion.
Suction the lubricating water to leak from the periphery
A shaft sealing device for a vertical shaft pump, wherein a return water passage for returning to a holding room is provided , and the system is used for a rainwater drainage pump performing a preliminary standby operation.