JPH0323535Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field The present invention is designed to prevent damage to the bearing of the flowmeter due to solid particles contained in the fluid being measured when measuring a high viscosity fluid such as slurry using a positive displacement flowmeter. The present invention relates to a forced lubrication device for a positive displacement flow meter bearing, which constantly pressurizes lubricating oil into the bearing to prevent the occurrence of oil failure.

Conventional technology The fluid to be measured is coal oil mixed oil (hereinafter referred to as COM)
If the product contains solid phase components such as petroleum powder, this solid phase component may be forced into the flowmeter's bearings and enter the bearings, causing wear of the bearings and causing serious damage. There is a rare possibility. In order to prevent such highly measured fluid containing solid phase content from entering the bearing part, the flowmeter described in Japanese Utility Model Publication No. 54-5635 utilizes the pressure on the inflow side, that is, the high pressure side of the flowmeter body. Then, the inside of the separately provided lubricating oil tank is isolated by a flexible seal, and the lubricating oil is pumped to the lubricating oil filling chamber through the seal part of the bearing part, which corresponds to the pressure loss on the inlet side. That's what I do. In addition, in the flowmeter described in Japanese Utility Model Application Publication No. 54-97137, a communication hole is formed in the bearing that governs the rotor shaft, and lubricating oil is pressurized to a predetermined pressure through the communication hole and then flows into the bearing. A pressure intensifier and a storage tank for storing lubricating oil are connected to supply the lubricating oil.

Problems to be Solved In the flowmeter described in the above-mentioned Japanese Utility Model Publication No. 54-5635, the lubricating oil pressure sent to the lubricating oil filling chamber of the bearing part does not depend on the pressure in the external space of the fluid, and the flow rate of the fluid to be measured is This is a pressure related to the flow rate, that is, a pressure approximately proportional to the square of the flow rate. Therefore, when the fluid does not flow, no pumping pressure is generated, and if the pressure in the lubricating oil storage tank is lower than the measured fluid for some reason, slurry solid particles may enter the bearing if there is a seal mechanism failure. This may cause premature bearing wear. In addition, in the flowmeter described in Utility Model Application Publication No. 54-97137,
The pressure increase mechanism is determined by the relationship between the area difference between the top and bottom surfaces of the piston that slides into the lubricating oil storage tank, the external pressure, and the measured fluid pressure, so even if the piston top area ratio is given constant, When the pressure of the fluid to be measured changes, the amount of lubricating oil supplied also changes, and when the pressure increases, the lubricating oil is consumed prematurely, causing inconvenience in maintenance.

Means for Solving the Problems This invention aims to solve the problems mentioned above.
The flexible seal in the flowmeter described in Publication No. 54-5635 is pressurized by an elastic means such as a spring, and this pressurizing force is added to the loss pressure on the inflow side, so that even when the flow rate is stopped, the measured fluid can be maintained. This allows lubricating oil to be supplied to the bearing regardless of the pressure. In addition, by detecting the difference between the pressure on the inflow side and the pressure on the outflow side, and controlling the flow of lubricating oil with a needle valve that is displaced by this pressure difference, a constant amount of lubricating oil can be delivered regardless of the pressure of the fluid being measured. You can also supply only

Embodiment FIGS. 1 and 2 are cross-sectional views for explaining the reflective surfaces of the embodiments, respectively. In the figures, numerals indicate the forced lubrication device section, numerals the flow meter section, and numerals the lubricating oil supply system passage section. The part indicated by a black dot is the metering fluid COM, and the part indicated by a cross hatch is the lubricating oil. The lubricating device part includes a three-way flange 11 and a straight pipe flange 1.
2, an oil pot 13, a spring receiving plate 14 having a through hole 14a disposed between one outlet of the three-way flange 11 and the straight pipe flange 12, a spring receiving plate 14 disposed between the straight pipe flange 12 and the oil pot 13; It consists of a flexible seal member 15, a pressure spring 16 interposed between the spring receiving plate 14 and the seal member 15, an oil supply coupler 17 for filling oil into the oil pot 13, etc., and is a positive displacement flowmeter. The section has a rotor 21, a rotor shaft 22, a metering chamber 23, a plain bearing 24, a seal 25, a lubricating oil filling chamber 26, etc., and as shown in the figure, it is connected to the bearing section of the flow meter body through the seal 25. It has a lubricating oil filling chamber 26. In addition, the lubricating oil supply system has an on/off valve 3.
1, a lubricating oil amount adjusting valve 32, a pressure guiding pipe 33, etc., and the lubricating oil supply line section is connected to the oil pot 1 of the forced oil lubrication device section as described below.
The lubricating oil in 3 is pumped to a lubricating oil filling chamber 26 of the flow meter section.

That is, in the present invention, oil pot 1
The pressure inside 3 is slightly higher than the loss pressure on the inflow side of the flow meter section, that is, the pressure is higher by the pressure added by the spring 16, and this high pressure is passed through the lubricating oil supply line section. The lubricating oil is supplied to the lubricating oil filling chamber 26 of the flowmeter section, thereby making the pressure on the lubricating oil filling chamber always higher than the pressure on the metering chamber 23 side to prevent powder in the fluid to be measured from entering the bearing section. That's what I do.

Note that the embodiment shown in FIG. 2 uses a differential pressure bellow that displaces the lubricating oil amount adjustment valve 32 in the embodiment shown in FIG. 32a and a needle valve 32b whose opening degree changes depending on the displacement amount of the differential pressure bellows 32a.
In this way, a constant amount of lubricating oil can always be supplied regardless of the pressure of the fluid to be measured.

Effects As is clear from the above explanation, according to the present invention, a pressure higher than the pressure of the fluid to be measured can be supplied to the bearing, regardless of the pressure of the fluid to be measured. Powder and the like in the measurement fluid do not enter, and wear and damage to the bearing can be effectively prevented.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional configuration diagrams for explaining an embodiment of the present invention, respectively. ... Forced oil lubrication device section, ... Volumetric flow meter section, ... Lubricating oil supply system path section, 13 ... Oil pot, 16 ... Pressure spring, 24 ... Bearing, 25 ...
...Seal, 26...Lubricating oil filling chamber, 31...On/off valve, 32...Lubricating oil amount adjustment valve,
32... Differential pressure bellows, 33... Needle valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A spring tray that is interposed in a pipe line branching from the inlet of a positive displacement flowmeter and has a through hole for introducing inlet pressure, and an oil pot having a flexible sealing member to which the inlet pressure acts and containing lubricating oil; and a pressure spring interposed between the spring receiver and the flexible sealing member to press the flexible sealing member. What is claimed is: 1. A forced lubrication device for a positive displacement flow meter bearing, characterized in that the forced lubrication device comprises a forced lubrication device comprising: a positive displacement flow meter bearing portion communicating with an oil pot; (2) A valve device disposed in the conduit communicating the oil pot and the bearing portion to control the flow of lubricating oil, and a differential pressure bellow that is interlocked with the valve body of the valve device and is displaced according to the differential pressure of the positive displacement flowmeter. A forced lubrication device for a positive displacement flowmeter bearing according to claim 1, wherein the displacement is made in a direction in which the valve opening in the valve device is inversely proportional to the differential pressure.