JPH0213932Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a bearing lubrication device for a positive displacement flowmeter that is suitable not only for general volumetric measurement, but also for slurry fluids such as COM.

[Prior art]

The quality of the positive displacement flowmeter bearing is an important component that determines the accuracy and durability of the flowmeter.
If the liquid to be measured is corrosive or a slurry such as COM (coal/heavy oil mixed fluid), it is necessary to forcibly feed lubricating oil from the outside to the bearing. The lubricating oil is pumped by using the differential pressure between the inflow and outflow of the positive displacement flowmeter, and a sealing mechanism is installed to prevent the liquid to be measured from mixing with the lubricating oil. was. In this method, lubricating oil is unilaterally pumped by differential pressure, but when the flow stops, the differential pressure disappears, so if the liquid pressure is higher than the lubricating oil pressure and the sealing mechanism is incomplete, the measured liquid If the lubricant gets mixed in with the lubricating oil, and when the bearing is operated again, the fluid to be measured will be mixed in and the lubricating effect will be lost. Even if it did, it could not be detected, and this caused the problem of significantly shortening the life of the bearing.

[Summary of the idea]

This idea was made by paying attention to the points mentioned above, and includes providing a pump driven by the rotational force of at least one of the rotor shafts of a pair of rotors rotating in the measuring chamber, and Separately from the bearing that supports the bearing, a pocket that surrounds the shaft is provided along the vicinity of the rotor in the casing that supports this bearing, and the bearing and the
By circulating the desired lubricating oil with the pocket and pump, impurities such as slurry that enter the metering chamber along the rotor shaft are captured by the pocket and completely prevented from entering the bearing. The captured impurities are taken out to the outside of the flowmeter along with the circulating lubricating oil by the action of the pump.Furthermore, if the lubricating oil reaches a certain level of impurity, it is possible to notify the outside with an alarm. This relates to a bearing lubrication device for a flowmeter.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

1 is a pair of non-circular gear-shaped rotors 2, for example.
The metering chamber of flowmeter A is rotatably arranged by meshing a and 2b, and 3a and 3b are the rotors 2a and 2b.
The rotor shaft is rotatably supported on the casing 4 of the measuring chamber 1. Reference numeral 5 indicates a bearing, and an oil groove is bored on the inner surface in a desired structure to enable the flow of lubricating oil. Reference numeral 6 designates a lubricating oil reservoir pocket provided in the casing 4 supporting the bearing 5 so as to annularly surround a part of the rotor shafts 3a, 3b along the vicinity of the rotors 2a, 2b. A sealing material 7 mainly composed of an O-ring is disposed in front of the sealing material 7 . Reference numeral 8 indicates a pump provided at one end of the rotor shaft 3b, and a gear 10 provided on a rotating shaft 9 directly connected concentrically with the rotor shaft 3b;
A gear 11 of the same shape and size that meshes with the gear 1 is fixed to a casing 13 fixed by a shaft 12 to form a kind of gear pump, and has an inlet 14 and an outlet 15 for lubricating oil to force the lubricating oil. It makes circulation possible. In addition, although the pump 8 is shown in one place, it can be attached to other places of the rotor shafts 3a, 3b as desired. The output side of the pump 8 is connected to the pocket 6 from the outer ends of the four bearings 5, that is, from the end surfaces of the respective rotor shafts 3a and 3b, through the contact surfaces between the rotor shafts 3a and 3b and the bearings 5. Hydraulic pressure is applied by a pump 8 so that lubricating oil can flow toward the pump.

Reference numeral 16 denotes a circulation flow path for lubricating oil that is circulated by applying hydraulic pressure from the pump 8, and the flow path on the side flowing out from the pocket 6 to the outside of the flow meter A has a filter that can remove slurry such as impurities. A strainer 17 is provided, and an optical impurity detection means 18 for detecting the impurity of the circulating lubricating oil is further provided in the front. This means 18, for example, arranges a light source 19 and a light receiving element 20 in opposition to a transparent part 21 of a part of the circulation channel 16 through which lubricating oil passes, and detects changes in the amount of light reaching the light receiving element 20 from the light source 19. When a desired set impurity level is reached, a separate alarm mechanism 22 can notify the outside of the abnormality by sound or light.

Reference numeral 23 denotes an auxiliary hydraulic flow path that is connected to the circulation flow path 16 and compensates for the initial inflow of lubricating oil and the circulating oil pressure of the inflowed lubricating oil, and the auxiliary hydraulic flow path 23 controls the fluid pressure on the inlet side of the flowmeter A through a diaphragm 24. An oil sump pump 25 is provided that can transmit hydraulic pressure to the circulation flow path 16 by applying pressure P. That is, this oil sump pump 25 compensates the oil pressure as line pressure to the lubricating oil constantly flowing in the circulation flow path 16 during the operating time from the time when flow meter A starts measuring the flow rate to when it stops.
This hydraulic pressure compensation helps reduce the load on the pump 8, and improves the inconvenience of forcing the pump 8 to perform an unreasonable hydraulic action. Note that this oil distillation pump 25 may be operated in the same manner by using a weight (not shown) having a necessary weight in place of the fluid pressure P on the inlet side of the flow meter A.

In the figure, numeral 26 is the inlet of flowmeter A, and 27
indicates a check valve.

The action will be explained based on the above structure.

When fluid flows into flowmeter A, a pair of rotors 2
a, 2b mesh with each other and rotate, and the fluid flows in and out through the measuring chamber 1, and its volume is equal to that of the rotor 2.
The rotational speed of a and 2b is measured by an appropriate means. At the same time as this flow rate measurement, the rotor shaft 3b
The rotation of the gear pump type pump 8 is driven to rotate, and the lubricating oil in the circulation flow path 16 is directed inward from the end of each rotor shaft 3a, 3b, and the bearing 5 is rotated.
It reaches the pocket 6 through it, effectively lubricates the bearing 5 portion, and completely prevents the measuring fluid from flowing into the measuring chamber 1. The lubricating oil stored in this pocket 6 completely covers the outer peripheral surfaces of parts of the rotor shafts 3a and 3b to prevent the measurement fluid from entering, and also to completely remove impurities such as slurry in this pocket 6. It can be captured and prevented from entering the bearing 5. The lubricating oil stored in this pocket 6 passes through a flow path 16 and is purified by removing impurities in a strainer 17, and is repeatedly circulated through the circulation flow path 16 while the contamination state of the lubricating oil is detected by an optical impurity detection means 18. The pump 8 applies a fluid pressure higher than the fluid pressure in the metering chamber 1 of the flow meter A to the lubricating oil repeatedly, and the rotor shafts 3a, 3b of the flow meter A
can be rotated smoothly in the bearing 5. In addition, while measuring the flow rate, the oil spill pump 2
Since pump 5 is constantly operated to assist the driving action of pump 8, there is an advantage that the operation of pump 8 is not strained.

Although one embodiment of this invention has been described above, this invention is applicable not only to rotors with non-circular gear types, but also to rotors that measure the capacity of a desired fluid, such as circular types as well as roots types. Any type of flowmeter can be applied as long as it is equipped with the following.

[Effect of idea]

According to this idea, not only the fluid to be measured but also
It is possible to completely prevent the inconvenience of slurry such as impurities in the fluid entering the bearing through the rotor shaft, so it is effective for special fuels containing particulate components such as COM, and the drive is effective for eliminating impurity entry. Since the source operates a pump that uses the energy of the rotor's rotation itself, there is no need for special energy to circulate the lubricating oil, which saves labor.In particular, impurities such as slurry are caught in the pocket and immediately removed from the outside. This has the effect that the necessary lubricating oil can be constantly supplied to the bearing and smooth rotation can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the bearing lubrication device for a positive displacement flowmeter according to this invention, with a lubricating oil circulation flow path attached, Fig. 2 is an enlarged sectional view of the same pump section, and Fig. 3 2 is a sectional view taken along the - line in FIG. 2. 1...Measuring chamber of flowmeter A, 2a, 2b...Rotor, 3a, 3b...Rotor shaft, 4...Casing, 5...Bearing, 6...Pocket, 8...Pump, 16... Lubricating oil circulation flow path, 17... strainer, 18... optical impurity detection means, 22...
...Alarm mechanism, 23...Auxiliary hydraulic flow path.

Claims (1)

[Claims for Utility Model Registration] (1) A bearing lubricating device for a positive displacement flowmeter that rotatably supports the rotor shafts of a pair of rotors that rotate in proportion to the flow rate in a measuring chamber of a casing; The apparatus is connected to an oil sump pump containing lubricating oil so as to be able to be pumped as a pressure source of the flow meter inlet side pressure, and the rotor shaft which communicates with the oil sump pump and further pressurizes the lubricating oil in the oil sump pump. It consists of a rotationally driven pump, and an annular pocket fitted around the rotor between each bearing and the measuring chamber of the casing, and the lubricating oil pumped by the pump is transferred to each bearing. A bearing lubricating device for a positive displacement flowmeter, characterized in that lubricating oil is forced into the annular pocket through the annular pocket, and the lubricating oil in the pocket is circulated through a circulation channel that reaches the pump. (2) A bearing lubricating device for a positive displacement flowmeter according to claim 1, wherein the desired lubricating oil is over-purified by a strainer during the process of pumping and circulating the desired lubricating oil to the bearing, pocket and pump. (3) Utility model registration claim 1, which is capable of detecting impurities in the lubricating oil by optical means and issuing an alarm during the process of pumping and circulating the desired lubricating oil to bearings, pockets, and pumps. Alternatively, the bearing lubricating device for a positive displacement flowmeter according to any one of Item 2.