JPS6244158Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a grease supply device for the shaft sealing part of a slurry transport pump. In particular, by using the discharge pressure of the pump to forcefully feed grease to the shaft sealing part, the invention provides a system for supplying grease to the shaft sealing part during pump operation. enables automatic continuous lubrication.

Conventionally, when applying grease to the shaft seal of a pump, a grease cup, a grease gun, or an electric automatic lubrication device is used.

However, with lubrication using a grease cup, etc., it is impossible to constantly supply a fixed amount of lubrication.
Since the shaft seal does not have the ability to follow pressure fluctuations, an appropriate amount of grease is not supplied, shortening the life of the shaft seal and causing early liquid leakage. On the other hand, electric grease supply devices are expensive, require high grease supply pressure, and cannot follow pressure fluctuations in the pump shaft sealing portion, resulting in excessive grease consumption and are uneconomical.

In addition, as a device for supplying grease etc. to the shaft seal part using the discharge pressure of the pump, there is
There is something like the one described in Publication No. 77303. This device divides the inside of a vertically long cylinder into upper and lower parts with a diaphragm, introduces the pump's discharge pressure into the upper chamber, and communicates the lower chamber filled with grease with the shaft seal of the pump.
The grease is pushed out and supplied by applying the discharge pressure to the grease through one diaphragm.

However, this device has a problem in that it cannot be used as a pump for transporting slurry. In other words, since the inside of the cylinder is divided only by the diaphragm into an upper chamber and a lower chamber, and the diaphragm has the same dimensions as the upper chamber, the amount of grease in the cylinder reaches its maximum when the diaphragm is fully inserted into the upper chamber. Therefore, the maximum amount of grease filled is equal to the volume of both the upper and lower chambers. However, when the pump used in this device is for transporting slurry, the slurry-containing liquid is supplied from the pump discharge part to the upper chamber, and the slurry accumulates here, effectively destroying the upper chamber. The volume decreases, and as a result, the amount of deformation of the diaphragm toward the upper chamber becomes smaller.
The amount of grease filled into the cylinder decreases. As a result, the amount of grease filled into the cylinder decreases as the amount of slurry adhesion increases, causing a problem in the supply of grease to the pump shaft seal. In particular, this device does not have a structure for removing slurry, so it is difficult to remove slurry from inside the cylinder. Another drawback is that it inhibits effective extrusion. Therefore, due to these defects, the device described in the above-mentioned publication cannot be practically used as a pump for transporting slurry. Furthermore, according to the device,
During pump operation, discharge pressure is constantly applied to the upper chamber, so even if the cylinder runs out of grease, it cannot be filled with grease.
Therefore, the operation of the pump must be stopped for grease filling, or operation must be continued without grease being supplied to the shaft seal.

This invention solves the above-mentioned problems in a grease supply device for a shaft seal of a slurry transport pump.

The purpose of this invention is to easily remove the adhered slurry in the pressurized chamber into which the pump discharge pressure is introduced, and to constantly supply the shaft seal with an amount of grease proportional to the pump discharge pressure. The purpose of this invention is to make it possible to adjust the ratio between the pump discharge pressure and the amount of grease supplied.The purpose of this invention is to prevent grease from being applied to the piston front chamber of the cylinder, which is normally filled with grease, even during pump operation. The goal is to be able to replenish the supply.

That is, this invention, as in the illustrated embodiment, has a pressurized liquid chamber 5 connected to the discharge pipe 2 of the pump 1 via the liquid supply valve 3 and equipped with a drain valve 9, and a diaphragm 11. A hydraulic oil chamber 12 connected to the pressurized liquid chamber 5; a grease supply cylinder 14 in which a piston rear chamber 15 is communicated with the hydraulic oil chamber 12 and a piston front chamber 17 is filled with grease; The present invention relates to a grease supply device for a pump shaft seal for slurry transport, which includes a grease supply pipe 22 connected from a supply cylinder 14 to a pump shaft seal 24 via a grease regulating valve 23.

This invention will be explained below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a grease supply device for a pump shaft sealing part, which is an embodiment of this invention.
A liquid supply valve 3 is branched from the discharge pipe 2 of the centrifugal pump 1.
A fluid supply port 6 of a pressurized fluid chamber 5 of a grease supply device 4 is connected to the fluid supply valve 3 . This pressurized liquid chamber 5 is provided with a liquid drain port 7 on the bottom surface and an air port 8 on the upper side surface, and a liquid drain valve 9 and an air vent valve 10 are attached to each of the pressurized liquid chambers 5.

A diaphragm 11 is stretched over the pressurized liquid chamber 5, and a hydraulic oil chamber 12 is connected to the pressurized liquid chamber 5 via the diaphragm 11.

A grease supply cylinder 14 with a built-in piston 13 is installed above the hydraulic oil chamber 12, and the piston rear chamber 15 is connected to the hydraulic oil chamber 12 and the oil passage hole 1.
6 is connected. The piston front chamber 17 is a grease chamber filled with grease, and a grease discharge port 18 is provided at the front end. If the grease supply cylinder 14 is made of a transparent material such as acrylic resin, it is convenient for checking the amount of grease filled.

A branch pipe 19 is connected to the grease discharge port 18, and a grease supply valve 20 is attached to one end of the branch pipe 19, and a grease replenishment valve 21 is attached to the other end.
One end of a grease supply pipe 22 is connected to the grease supply valve 20 , and the other end of the grease supply pipe 22 is connected to the pump shaft seal 2 through a grease regulating valve 23 .
It is connected to the insertion ring 25 of No. 4.

An oil seal 30 is inserted into the pump shaft seal portion 24 between a shaft sleeve 28 inserted into a shaft 27 to which an impeller 26 is attached and a pump casing 29 .

When the pump 1 is operated, a part of the discharge liquid enters the pressurized liquid chamber 5 from the discharge pipe line 2 through the liquid supply valve 3 and is moved by pushing the diaphragm 11 with the discharge pressure of the pump 1. As the diaphragm 11 moves, the hydraulic oil in the hydraulic oil chamber 12 flows into the piston rear chamber 16 of the grease supply cylinder 14 through the oil passage hole 16, pushing the piston 13 forward. Therefore,
The grease filled in the piston front chamber 17 is discharged from the grease discharge port 18, and is discharged from the branch pipe 1.
9. The grease is fed under pressure to the pump shaft seal 24 through the grease supply pipe 22. The supply amount of the pressure-fed grease is adjusted by the grease adjustment valve 23, and the supply amount is adjusted by the grease adjustment valve 23.
The liquid in the casing 29 of the pump 1 is prevented from entering the shaft sealing portion 24, and the inside is sealed and the sliding surfaces are lubricated.

Here, since the impeller 26 of the pump 1 is provided with a back blade 31, a pressure difference is generated between the discharge pressure of the pump 1 and the pressure of the shaft seal 24 due to the pressure reducing action of the back blade 31. Since this differential pressure is constant regardless of changes in the rotational speed of the pump 1, the grease supply pressure is constant and continuous quantitative oil supply can be performed. Furthermore, if the differential pressure with the shaft seal portion 24 fluctuates due to a change in flow rate due to a change in the resistance of the discharge pipe 2, the grease supply pressure changes accordingly, so that an appropriate amount of oil can always be supplied.

Piston front chamber 17 of grease supply cylinder 14
If the grease inside is reduced, it is replenished as follows. First, close the liquid supply valve 3, and then close the liquid drain valve 9.
Open the air vent valve 10 and drain the liquid in the pressurized liquid chamber through the drain port 7.
discharge from. Next, the grease supply valve 20 is closed, the grease replenishment valve 21 is opened, and grease is replenished using a known grease feeder or the like. Once the grease is filled, the grease replenishment valve 21 is closed, the grease supply valve 20 is opened, the drain valve 9 is closed, and then the fluid supply valve 3 is gradually opened so that the air in the pressurized fluid chamber 5 is released from the air port 8. When the liquid is removed from the air, the air vent valve 10 is closed and the liquid supply valve 3 is fully opened. Grease is then automatically supplied to the shaft sealing portion 24 again by the discharge pressure of the pump 1.

As mentioned above, according to this invention, the discharge pressure of the pump is transmitted into the grease supply cylinder via the diaphragm, the hydraulic oil chamber, and the piston.
The amount of slurry in the pressurized liquid chamber has no effect on the capacity of the cylinder, so a constant amount of grease is always supplied to the cylinder's piston front chamber, and the pressure in the pressurized liquid chamber remains constant during operation. Grease is a grease that is converted to pressure in the oil chamber and moves the piston using the converted oil pressure, so the piston can be operated accurately even with a small pressure difference, and it responds sensitively to the pump discharge pressure. supply can be made. In addition, the discharge pressure in the pressurized liquid chamber can be shut off by closing the liquid supply valve, so that the slurry inside the pressurized chamber can be removed from the drain valve even during pump operation. Therefore, slurry accumulation within the pressurizing chamber can be easily prevented. For this reason, the amount of slurry in the pressurized liquid chamber does not affect the cylinder capacity, and by making it possible to remove slurry during pump operation, the grease supply device to the shaft seal can be used as a pump for transporting slurry. It became possible to apply it to Furthermore, since the amount of oil supplied to the shaft seal portion can be adjusted using the grease adjustment valve, it is possible to optimally adjust the ratio between the discharge pressure of the pump and the amount of grease supplied.

[Brief explanation of the drawing]

The figure is a diagram showing the configuration of a grease supply device for a pump shaft sealing portion, which is an embodiment of the present invention. In the figure, 1 is the pump, 2 is the discharge pipe, 4 is the grease supply device, 5 is the pressurized liquid chamber, 11 is the diaphragm, 12 is the hydraulic oil chamber, 13 is the piston, 14 is the grease supply cylinder, and 15 is the rear of the piston. room, 16
17 is a piston front chamber, 22 is a grease supply pipe, and 24 is a pump shaft seal.

Claims (1)

[Scope of utility model registration request] A pressurized liquid chamber connected to the discharge pipe of the pump via a liquid supply valve and equipped with a drain valve, a hydraulic oil chamber connected to the pressurized liquid chamber via a diaphragm, and the hydraulic oil chamber. The piston rear chamber communicates with the piston rear chamber, and the piston front chamber is equipped with a grease supply cylinder filled with grease, and a grease supply pipe connected from the grease supply cylinder to the pump shaft seal via a grease adjustment valve. Grease supply device for the shaft seal of a slurry transport pump.