JPH0122115Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a flow rate measuring device for measuring the flow rate from an object to be measured. Conventionally, the amount of air flowing out from an object to be measured is measured in measuring the amount of outflow (leakage) from a closed container or the permeability of pores in a sintered part. Therefore, in the case of objects to be measured, such as sintered bearings, where the state of impregnated oil permeation through the pores is a problem, the permeation state of oil and the permeation state of air within the pores are not necessarily the same. 1
There is a disadvantage that the characteristics of the sintered bearing cannot be appropriately determined because it does not correspond to the ratio of 1:1. Furthermore, even if a normal sealed container is used, depending on the contents contained therein, there may be cases where the leakage is not as great as air, and even in this case, if leakage is measured using air, judgments should be made more rigorously than necessary. This has the disadvantage of having to be done. An object of the present invention is to provide a flow rate measuring device that can accurately measure the flow rate of a liquid to be measured. The flow rate measuring device according to the present invention includes a gas leak measuring device, a liquid tank, a liquid injection passage, a first measurement jig, a thermostatic chamber, an air injection passage, and a second measurement jig. It has become well-prepared. The gas leak measuring device is equipped with a reference tank, a unit chamber connected to the reference tank via a balance valve, a detection means for detecting the pressure difference between the reference tank and the unit chamber, and a liquid tank separated into the unit chamber. They are connected via a valve, and a liquid such as oil is stored inside the valve, and the liquid injection passage is
The first measuring jig is for guiding the liquid in the liquid tank into the object to be measured, and a pot is provided on the way. Holds the object to be measured,
The first measurement jig is housed in a thermostatic chamber, and the air injection passage is connected to the unit chamber in parallel with the liquid tank and the liquid injection passage via a separation valve, and has a tank in the middle. The measurement jig holds the object to be measured so that air in the unit chamber led through the air injection passage can flow into and out of the object. In the above invention, the reference tank, unit room,
After pressurizing each liquid tank to the same air pressure, open the separation valve to communicate the unit chamber and liquid tank, and open the liquid injection passage to transfer the liquid in the liquid tank to the first measuring jig. When the liquid is supplied to an object to be measured held in a By detecting this with the detection means, the amount of liquid flowing out from the object to be measured can be measured. After pressurizing each of the reference tank and unit chamber to the same air pressure, open the separation valve and open the air injection passage to supply the air in the unit chamber to the measured object held in the second measurement jig. When air is supplied to the object to be measured, the pressure in the unit chamber decreases due to the amount of air flowing out from the object to be measured, creating a pressure difference between the unit chamber and the reference tank. The amount of air flowing out from the object to be measured can be measured. By measuring the amount of liquid flowing out and the amount of air flowing out of the object to be measured as described above, the amount of liquid flowing out and the amount of air flowing out of the object to be measured of the same type held by the first and second measurement jigs is determined. It became clear that there is a relationship with
If the object to be measured is a sintered bearing in which the amount of oil leakage is important, data regarding the amount of oil leakage and the amount of air output can be obtained. Further, in the present invention, since the first measurement jig is housed in a constant temperature bath, it is possible to measure the flow rate of the liquid while taking into account changes in the viscosity of the liquid due to temperature changes. Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 shows a system diagram showing one embodiment of the present invention. In FIG. 1, a pressure source side connection port 6 of a gas leak measuring device 5 is connected to a pressure source 1, such as an air compressor, through a filter 2, a regulator 3, and a pressure gauge 4. This gas leak measuring device 5
The workpiece side connection port 7 is filled with oil 8 as an injection liquid.
An oil flow measuring jig 11, which is a first measuring jig, is connected via an oil tank 9 and an oil tank 10 as a liquid tank containing a An airflow rate measuring jig 13, which is a second measuring jig, is connected in parallel with the jig 11 via an air tank 12. The oil flow measuring jig 11 includes a pair of upper and lower rubber pads 15 and 16 that can seal the end face of a sintered bearing 14 as an object to be measured, a pedestal 17 that supports the lower rubber pad 16, and this pedestal 17. A receiving plate 18 is provided at the lower part of the bearing plate 18 to receive the oil 8 flowing out from the sintered bearing 14, a pressing plate 19 is placed on the upper rubber pad 15, and the supporting plate 17 is supported by the pedestal 17 via a pedestal 20. together with the pressing plate 19
The jig 11 is composed of a cylinder 21 that presses the rubber pads 15 and 16 to bring the pair of rubber pads 15 and 16 into close contact with the sintered bearing 14, and the entire oil flow measuring jig 11 is housed in a constant temperature bath 22. Further, an oil passage 23 is provided passing through the pedestal 17 and the lower rubber pad 16, and a liquid injection passage 2 connecting this oil passage 23 and the oil pot 10 is provided.
4, the part located inside the constant temperature bath 22 is formed into a coil shape or the like, and the liquid temperature adjusting part 2
5 is provided, and the temperature of the oil 8 as the injected liquid is made equal to the temperature of the constant temperature bath 22 by passing through the liquid temperature adjustment section 25. The aeration amount measuring jig 13 is the oil passing amount measuring jig 1.
1, and includes a pair of rubber pads 26 and 27 that can seal the end face of the sintered bearing 14 as the object to be measured, a pedestal 28 that supports the lower rubber pad 27, and a pedestal 28 that is mounted on the upper rubber pad 26. a cylinder 31 that is supported by the pedestal 28 via a pedestal 30 and presses the pressing plate 29 to bring the pair of rubber pads 26 and 27 into close contact with the sintered bearing 14; It consists of In addition, the pedestal 28 and the lower rubber pad 27
An air passage 32 is provided through the air passage 32, and a passage from the air tank 12 is connected to this air passage 32. The oil flow amount measuring jig 11 and the aeration amount measuring jig 1
Each cylinder 21, 31 of 3 is a 2-position switching valve 3.
The switching valve 3 is connected to the pressure source side compressed air circuit between the filter 2 and the regulator 3 via the switching valve 3.
3, the piston rods of the cylinders 21 and 31 are moved forward and backward, and the sintered bearing 14 is sealed and fixed or released by the pressure of the pressing plates 19 and 29. The gas leak measuring device 5 includes a casing 34 made of a sealed container, and the inside of the casing 34 is divided into two by a partition plate 35, and one unit chamber 36 houses a balance unit 37 as a detection means. In addition, the other chamber is used as a reference tank 38. This balance unit 37 has a fulcrum 3 in the middle.
A balance 40 is swingably supported at 9, a bell cup 41 is attached to one end of the balance 40 and has the shape of a bowl turned upside down;
A communication hole 4 allows the lower end opening of 1 to be liquid-sealed and movable up and down in a liquid-sealed state, and communicates the inside of this liquid-sealed bell cup 41 with the inside of the reference tank 38.
2 and the bell cup 41.
Attached to the balance 40 at the end opposite to the balance 4
a differential transformer 44 that detects the amount of inclination of the differential transformer 44, and a return mechanism that is attached to the balance 40 at the end on the same side as the differential transformer 44 and includes a coil and a magnet that forcibly positions the balance 40 in a constant horizontal position. It consists of 45. The reference tank 38 of the housing 34 is communicated with the pressure source side connection port 6 via a first pressurizing valve 46, and the unit chamber 36 is connected to the pressure source side via a separation valve 47 and a second pressurizing valve 48. Source side connection port 6
The intermediate position between these separation valves 47 and the second pressurizing valve 48 is communicated with the workpiece side connection port 7. Further, the reference tank 38 and the unit chamber 36 are communicated with each other via a balance valve 49, so that the pressures in the reference tank 38 and in the unit chamber 36 can be made the same. The oil tank 9 is provided with a level meter 50 and an oil injection hole 53 which is normally sealed with an O-ring 51 and a bolt 52. In the above, the air tank 12 is provided in the middle of the air injection passage 54.
is connected to the unit chamber 36 of the gas leak measuring device 5 via a separation valve 47, and the air injection passage 54 is in parallel with the oil tank 9 and the liquid injection passage 24. Next, the operation of this embodiment will be explained. First, to measure the oil flow characteristics of the sintered bearing 14 as the object to be measured using the oil flow measurement jig 11,
While closing each valve 46 to 49 of the gas leak measuring device 5, the oil tank 10 and the air tank 1 are closed.
2 is closed, and the regulator 3 is set to a predetermined pressure, e.g.
Set to 0.5-1Kg/ ^cm2 . Next, the first and second pressurizing valves 46, 48, separation valve 47, and balance valve 49 of the gas leakage measuring device 5 are opened to release air in the unit chamber 36, reference tank 38, bell cup 41, and upper part of the oil tank 9. Pressurize the inside of the layer to the pressure set by the regulator 3, wait until the temperature is no longer affected by this pressurization, and stabilize. After stabilization, all valves 4 of the gas leak measuring device 5 are closed.
Close 6-49. When the inside of the unit chamber 36 is pressurized, the return mechanism 45 is operated, and the balance 40 of the balance unit 37 is held at a predetermined horizontal position. Next, the sintered bearing 14 as the object to be measured is placed on the lower rubber pad 16 of the pair of rubber pads 15 and 16 of the oil flow measuring jig 11, and the oil pot 10 is slightly opened to drain oil from the oil tank 9. 8 is supplied into the sintered bearing 14, and the oil 18 is supplied into the sintered bearing 14.
As soon as it is filled, close the oil pot 10,
The upper rubber pad 15 and pressing plate 19 are placed on the sintered bearing 14, and the cylinder 21 is connected via the switching valve 33.
compressed air is supplied in the direction in which the piston rod advances, and the upper and lower rubber pads 1 are
5 and 16 to seal the upper and lower end surfaces of the sintered bearing 14. After this seal, oil Kotoku 10
fully open. Next, the second pressurizing valve 48 is opened for a predetermined period of time to pressurize the inside of the oil tank 9, to replenish the pressure reduced by supplying the oil 8 to the sintered bearing 14 side, and after this pressurization, the separation valve 47 is opened. When opened, the inside of the unit chamber 36 of the gas leak measuring device 5 and the inside of the sintered bearing 14 are communicated through the oil tank 9. In this state, when the start switch (not shown) of the gas leak measuring device 5 is pressed to operate the measuring device 5, the return mechanism 45 is opened and the balance 40 becomes free. On the other hand, due to the pressure in the unit chamber 36 and the oil tank 9, the oil 8 in the oil tank 9 flows out through the holes in the sintered bearing 14, and the pressure in the unit chamber 36 decreases accordingly. Become. When the pressure inside the unit chamber 36 decreases, a pressure difference occurs within the bell cup 41 which is connected to the reference tank 38 with no pressure drop, and the pressure within the bell cup 41 causes the bell cup 4 to increase.
The balance 40 is tilted in the direction in which the sintered bearing 14 is tilted in the direction in which the
The amount of oil 8 flowing out can be measured. At this time, when the oil 8 is supplied to the sintered bearing 14 for a certain period of time, for example, 1 minute, the separation valve 47 is automatically closed, and the return mechanism 45 is activated to force the balance 40 to the horizontal position. Then, the balance valve 49 is opened to equalize the pressures in the unit chamber 36 and the reference tank 38. After this pressure equalization, the balance valve 49 is closed, the return mechanism 45 is turned off, and the isolation valve is closed. 49 is opened, the supply of oil 8 to the sintered bearing 14 is started again in the same manner as described above, and thereafter, the supply of oil 8 to the sintered bearing 14 is repeated several times intermittently in the same manner, and each supply The amount of oil 8 spilled per step is recorded. The oil permeability of the sintered bearing 14 is determined based on this recorded value. Next, the sintered bearing 1 is measured using the airflow measurement jig 13.
In order to measure the ventilation characteristics of No. 4, the inside of the gas leakage measuring device 5 is pressurized in the same way as when measuring the oil permeability characteristics, and a sintered bearing is placed between the pair of rubber pads 26 and 27 of the ventilation amount measuring jig 13. 14 is set and sealed and fixed by the piston rod of the cylinder 31 via the pressing plate 29. Next, the air tank 12 and the second pressurizing valve 48 are opened to pressurize the inside of the sintered bearing 14 for a predetermined period of time, and then the second pressurizing valve 48 is closed.Then, the separation valve 47 is opened and the unit chamber 36 is closed. The inside of the sintered bearing 14 is communicated with the inside of the sintered bearing 14, and the start switch of the measuring device 5 is pressed to operate the measuring device 5.
As a result, the return mechanism 45 is opened and the balance 40
becomes a free state, and a recording device (not shown) is activated, and the inclination of the balance 40 due to the outflow of air in the unit chamber 36 via the sintered bearing 14 is measured and recorded via the differential transformer 44. be done.
At this time, the time for supplying air to the sintered bearing 14 is set to be a fixed time, for example, 1 minute, as described above, and the supply for this predetermined time is for the unit chamber 36 and the reference tank 38.
This is done multiple times while balancing the pressure with the Thereafter, the sintered bearings 14 are replaced and similar operations are repeated to measure the oil permeability and air permeability of a plurality of sintered bearings 14. According to this embodiment as described above, the sintered bearing 14
Even if the object to be measured is impregnated with oil as shown in the figure, the oil permeability of the sintered bearing 14 can be measured by directly injecting the oil 8, and very useful data can be obtained for the design of the sintered bearing 14. Obtainable. In addition, in addition to the circuit for the oil flow rate measurement jig 11, the circuit for the ventilation rate measurement jig 13 is provided, so both the oil permeability and air permeability of the sintered bearing 14 can be measured, and based on these data, the sintered bearing It is possible to estimate the size of the 14 pores, etc.
Very useful data for design can be obtained from this point as well. Furthermore, in order to measure the amount of oil flowing, an oil tank 9 as a liquid tank is provided in the middle of the gas circuit for pressurizing the object to be measured of the normal gas leak measuring device 5, and oil 8 as the injection liquid is placed in the oil tank 9. It is sufficient to store the device and provide the oil pot 10, and the overall structure of the device is simple and can be provided at low cost. Also,
Since the oil flow measurement jig 11 is in the constant temperature bath 22,
Measurement data will not become inaccurate due to changes in the viscosity of the oil 8 due to temperature changes, and the temperature of the oil 8 can be stabilized by the liquid temperature adjustment section 25 provided in the middle of the liquid injection passage 24. This also improves the reliability of the data. Furthermore, the type of oil 8 is selected depending on the environment in which it will be used, such as for low temperatures or high temperatures, but it is important to understand its characteristics under constant temperatures, usually between -20°C and +80°C, to ensure that each temperature characteristic is included. Measurements at various temperatures are made possible by installing the constant temperature bath 22, and when the sintered bearing 14 is actually used, the viscosity of the oil 8 changes due to temperature rise due to friction with the shaft. It becomes possible to measure the characteristics at the temperature during actual use. Next, Table 1 shows the results of an experimental example in which the oil impregnation characteristics of a sintered bearing were measured using this example.

[Table] In Table-1, air permeability is air flow measurement jig 1.
3, and the time (minutes) until the amount of air 100c.c. flows out. cc)
Here, the cross section is a diagram showing the cross-sectional shape obtained using a metallurgical microscope, and the bearing characteristics are the results of a mounting test. According to Table 1 above, there is almost no difference in air permeability between specimens A and B, and therefore, when measuring air permeability, a medium with low flow resistance in the pores, that is, air, On the other hand, there is a clear difference in the amount of oil passing, and it is possible to properly judge the bearing characteristics based on this amount of oil passing. Moreover, according to the cross section shown in FIGS. 2A and 2B, specimen A has almost only a small hole 54, while specimen B has a small hole 55 and a larger hole 56.
Although it is possible to judge the oil-retaining properties by observing this cross section, it is not practical to conduct a destructive test to see the cross section, so this example was used. It can be said that this measurement method is inferior to oil permeability measurement. FIG. 3 shows the main parts of another embodiment of the present invention. This embodiment is an improvement of the pedestals 17 and 28 of the oil flow rate measuring jig 11 or the ventilation rate measuring jig 13 in the previous embodiments. That is,
The pedestals 17, 28 and the lower rubber pads 16, 27 placed thereon in the embodiment described above do not have any protrusions or the like, and therefore, it is difficult to position the sintered bearing 14 when setting it. . For this reason, in this embodiment, the guide member 57 that protrudes through the lower rubber pads 16, 27 is coaxially fixed to the upper openings of the oil (air) passages 23, 32 of the pedestals 17, 28. be. According to this embodiment, there is an advantage that positioning of the sintered bearing 14 becomes easy. Note that the object to be measured according to the present invention is not limited to a sintered bearing, but may also be a general container, etc. In this case, the injected liquid is not limited to oil, but may be another liquid such as water. As described above, the present invention has the advantage that it is possible to provide a flow rate measuring device capable of measuring the flow rate of liquid in an object to be measured.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing one embodiment of the flow rate measuring device according to the present invention, and Fig. 2 A and B show the cross-sectional shape of the test sample using the embodiment of Fig. 1, as seen with a metallurgical microscope. FIG. 3 is a sectional view of main parts showing another embodiment of the present invention. 1... Pressure source, 5... Gas leak measuring device, 8...
Oil as injection liquid, 9... Oil tank as liquid tank, 10... Oil pot, 11... 1st
12... An air flow measuring jig which is a measuring jig, 13... A ventilation amount measuring jig which is a second measuring jig, 14... A sintered bearing as an object to be measured, 1
5, 16, 26, 27...Rubber pad, 22...
Constant temperature chamber, 24...Fluid injection passage, 25...Liquid temperature adjustment section, 36...Unit chamber, 37...Balance unit as detection means, 38...Reference tank, 47...Balance valve, 54...Air injection passage.

Claims (1)

[Claims for Utility Model Registration] (1) A gas leak measuring device including a reference tank, a unit chamber connected to the reference tank via a balance valve, and a detection means for detecting a pressure difference between the reference tank and the unit chamber. A liquid tank connected to the unit chamber of the gas leakage measuring device via a separation valve and containing liquid therein, and a liquid injection device that guides the liquid in the liquid tank into the object to be measured and has a hole in the middle. a passage; a first measurement jig that holds an object to be measured so that the liquid guided through the liquid injection passage can flow into and out of the object; a thermostatic chamber that houses the measurement jig; An air injection passage that is connected in parallel to the liquid tank and the liquid injection passage through a separation valve to the unit chamber of the gas leakage measuring device, and that has a hole in the middle, and the air introduced through the air injection passage. A flow rate measuring device comprising: a second measuring jig that holds an object to be measured so that it can flow into and out of the object. (2) Scope of Utility Model Registration Claims In paragraph 1, in the middle of the liquid injection passage in the thermostatic oven,
A flow rate measuring device characterized in that a coil-shaped liquid temperature adjustment section is formed.