JPH04262193A - Lower bearing lubricating device - Google Patents

Abstract

PURPOSE:To enable lubrication, by a single lubricating device of lower bearings for a plurality of vacuum evaporators differing from each other in respect of operation pressure. CONSTITUTION:The lubricating device is constituted by a tank 1, a pump 3, flow meters 7, side glasses 8, lower bearings 9, a pressure equalizing nozzle 10, pressure-adjusting valves 11, and pipes 16, 17. The apparatus is arranged such that the pressure differences are balanced utilizing the fluid pressures in the lubrication-fluid return pipes. In the past, one lubricator was needed for one vacuum evaporator whereas, a plurality of vacuum evaporators can be operated by using one lubricating device.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a lower bearing in a centrifugal thin film evaporator or the like.

0002

2. Description of the Related Art Conventionally, as described in Japanese Patent Application No. 01-104455, one lubricating device was required for each lower bearing. In other words, the tank was operated with the same pressure in the lower bearing and piping.

0003

The above-mentioned prior art requires one lubricating device for each vacuum evaporator, which poses problems in terms of cost and maintenance.

An object of the present invention is to enable a lower bearing to be lubricated by a single lubricating device even if the operating pressures of the vacuum evaporators are different in a device that uses a plurality of vacuum evaporators.

[0005]

[Means for Solving the Problems] In order to achieve the above object, a pressure equalizing nozzle is provided in a tank, and this is connected to a vacuum generator of a vacuum evaporator having the highest operating pressure. A pressure regulating valve is installed on the lower bearing inlet pipe to prevent the lubricant from being sucked into a vacuum, and the return pipe is installed at the bottom of the tank so that it is always in the lubricant. The difference in height between the lower bearing and the tank is such that the difference in operating pressure can be compensated by the hydraulic pressure of the lubricant.

[0006]

[Operation] When the lubricating device is installed as described above, the lubricating liquid in the tank rises due to the pressure difference with the tank in the return pipe of the vacuum evaporator, which has a low operating pressure, and balances the pressure difference.

[0007] Lubricating fluid is supplied from a tank to each lower bearing portion by a pump. Then, it passes through the return pipe and is collected again into the tank. The difference between the tank pressure and the lower bearing pressure is balanced by the hydraulic pressure of the lubricating fluid in the return pipe. If the operating pressure is close to atmospheric pressure, or if there is a sufficient height difference between the lower bearing and the tank, the tank pressure equalization nozzle can be used to maintain the tank at atmospheric pressure without connecting it to a vacuum generator. He is also a master.

[0008]

Embodiment FIG. 1 shows an embodiment of the present invention. The lubricating device according to the present invention includes a lubricant tank 1, a strainer 2,
Pump 3 driven by motor 4, safety valve 5, control valve 6
, flow meter 7, sight glass 8, vacuum evaporator lower bearing 9
, a pressure equalizing nozzle 10 connected to the vacuum generator of the vacuum evaporator with the highest operating pressure, a pressure regulating valve 11, and valves 12 and 1.
5, a check valve 13, a liquid level gauge 14, and piping 16, 17.

The lubricating fluid in the tank 1 is supplied to the pump 3 through the valve 15 and the strainer 2, and is pressurized by the pump 3, and is then passed through the check valve 13, the flow meter 7, the piping 17, the pressure regulating valve 11, and the valve. 12 to the lower bearing 9 of each vacuum evaporator. Since the pressure in the lower bearing 9 is a vacuum, the lubricating fluid is used to increase the pressure in the pipe 17 to above atmospheric pressure using the pressure regulating valve 11. The lubricating fluid exiting the lower bearing passes through the valve 12, the sight glass 8, and the pipe 16 and is collected into the tank 1. In this case, the lubricating fluid in the tank 1 rises in the return pipe of the vacuum evaporator whose operating pressure is low due to the pressure difference with the tank 1, and the pressure difference is balanced. The safety valve 5 is used to protect the pump, and the control valve 6 is used to control the overall flow rate. Since the piping 16 is a vacuum piping, the tank attachment part is installed vertically and the piping returns to the liquid phase part in the tank 1. Similarly, the return piping of the lower bearing 9 of another vacuum evaporator is attached to the tank 1. Here, if there is a difference between the pressure in the tank 1 and the pressure in the lower bearing 9, lubricating fluid accumulates in the vertical portion of the pipe 16, creating a hydraulic pressure and balancing. In this way, the lower bearings 9 of a plurality of vacuum evaporators can be lubricated by one lubricating device without any problem.

[0010] If one vacuum evaporator breaks down, by closing the valve at the lower bearing inlet/outlet of that equipment, the operation of the lubricating system can be continued without affecting other equipment.

[0011]

[Effects of the Invention] According to the present invention, lubricating fluid can be supplied to the lower bearings of a plurality of vacuum evaporators by simply providing one lubricating device, thus reducing costs and making maintenance easier. .

[Brief explanation of the drawing]

FIG. 1 shows the flow of a lubricating device according to the invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Tank, 3...Pump, 8...Sight glass, 9...Lower bearing, 10...Pressure equalization nozzle, 11...Pressure adjustment valve, 12...Valve, 16...Piping.

Claims (1)

[Claims] Claim 1: A vacuum evaporator comprising a tank, a pump, a valve, piping, etc., a pressure equalizing nozzle communicating with a vacuum generator is provided in the tank, and a pressure regulating valve is installed in each of the lower bearings of a plurality of vacuum evaporators. A lubricating device for a lower bearing, characterized in that the device is connected to the tank through the tank, and a return pipe is attached to the bottom of the tank.