JPS62159890A - Device for detecting abnormality in lubricating oil feeding device - Google Patents

Abstract

PURPOSE:To accurately detect abnormality in the feeding of lubricating oil and air to a lubricated part by providing a pressure sensor in each of a defined quantity discharge oil feeding passage and a pipe line having an air-oil mixing device, and monitoring pressure change inside a device. CONSTITUTION:Compressed air generated in a pump 1 is fed to lubricated parts 2, 2 via branch pipes 32. An air-oil mixing device 7 is provided on each of these branch pipes 32 to mix a lubricating oil into the compressed air. Two check valves 8, 9 are provided in series in passages for feeding the lubricating oil to the air-oil mixing device 7, and a pressure sensor 12 is provided in between both of the check valves 8, 9. And, throttles 10, 11 are provided in each of the branch pipes 32 with the air-oil mixing device 7 interposed in between, and a pressure sensor 13 for detecting a pressure difference between the upper course side of the throttle 10 and a part between the air-oil mixing device and the throttle 11, is also provided. And, the output signals of both sensors 12, 13 are inputted into a detecting means 14 to judge an abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a device for detecting an abnormality in a lubricating oil supply device for supplying lubricating oil to a bearing device or the like.

2. Prior Art Conventionally, this type of lubricating oil supply device was disclosed in Japanese Patent Application Laid-open No. 58-1.
The one described in Japanese Patent No. 46792 is known. As shown in the system shown in Fig. 4, an air supply source is connected to a lubricated part a such as a bearing with an air supply pipe CTC.
A side path d branched from this air supply pipe C in the middle is connected to the air supply pipe C' near the oiled part a, and this side path d is equipped with an on-off valve e1 and a supply source g that opens and closes intermittently. An oil discharging device and a gas/oil mixer j are connected in sequence, and the opening and closing of an on-off valve e is controlled by a control device f such as a timer.
A small, constant amount of lubricating oil is intermittently discharged into the air supply pipe C', and the intermittently discharged lubricating oil is continuously conveyed to the lubricated part a by the air flow, thereby separating the oil and air. At the same time, the lubricant is to be supplied to the lubricated part a. Note that k is a nozzle and m1f1 is a pressure gauge.

Therefore, the lubricated part a is always continuously supplied with an appropriate amount of non-mist lubricating oil or a flow of compressed air, and the compressed air itself is also provided for cooling the lubricated part a. is always kept under optimal rotation conditions.

Problems to be Solved by the Invention In such a conventional lubricating oil supply method, since the amount of lubricating oil supplied to the lubricated part a is extremely small Ll, does it need to be reliably supplied? Is there, actually?
Abnormalities such as clogged nozzles, malfunctions in valves, or damage to piping can cause reliable supply of fluids to become impossible.

Therefore, in preparation for the occurrence of such an abnormal situation, a pressure gauge 1r1 is attached to the air supply pipe C and side passage d near the air supply source, and abnormalities can be detected by monitoring the pointer of this pressure gauge zn. However, there are the following problems.

! At the location where the pressure gauge n is installed, it is not possible to detect whether the metered oil dispensing device is operating reliably and a fixed amount of lubricating oil is being normally intermittently discharged, and it is not possible to accurately grasp the status of lubricating oil supply to the lubricated part a. .

2. At the installation location of the pressure gauge tn, it is possible to detect whether a pipe is broken or clogged between the air-oil mixer j and the nozzle, and whether a predetermined amount of air is being reliably discharged from the nozzle k. The air supply status to the lubricated part a cannot be accurately grasped.

It is an object of the present invention to solve the above-mentioned problems and to accurately detect abnormalities in the supply of moisture and air to the lubricated part.

1. Means for Solving the Problems In order to solve the problems, the present invention, as shown in FIG. 3, an intermittent oil supply #4 that intermittently discharges lubricating oil, and an oil supply pipe 5 from the intermittent oil supply source 4.
A metering oil discharging device 6 that intermittently discharges a fixed amount of oil supplied through the metering oil discharging device 6, and a metering oil discharging device 6 that intermittently discharges a fixed amount of oil, and the oil discharged from the metering oil discharging device 6 is supplied into the flow of compressed air in the air supply pipe 3. Then, the oil is transported to the oiled part 2 by the flow of compressed air.
(The oil mixer 7 simultaneously supplies oil and air to the lubricated part 2.
In the lubricating oil supply device that supplies the lubricating oil to the +Iif metering device 6, a check is installed in the middle of the path that connects the metering device 6 and the oil mixer 7 to prevent backflow of oil from the gas oil mixer 7 to the metering device 6. A valve 8 and a check valve 9 that opens and closes depending on changes in the pressure of oil discharged from the check valve 8 are provided, and a pipe line 34 on the L flow side of the air-oil mixer 7 of the air supply pipe 3 is provided. A throttle 10 and a throttle 11 are provided in the pipe line 35 on the downstream side of the gas-oil mixer 7, respectively, and the pressure difference between the pressure P2 generated in the upstream passage of the check valve 9 and the atmospheric pressure PO is suppressed. Pressure sensor 12 to detect and pressure P4 in the passage upstream of the throttle 10
A pressure sensor 13 detects the pressure difference between the pressure P3 and the pressure P3 in the passage on the upstream side of the throttle 11, and supplies lubricating oil when the pressure values detected by the pressure sensors 1-2 and 13 deviate from a predetermined value. An abnormality detection device for a lubricating oil supply device is provided, which is characterized by being provided with a detection means 14 for detecting an abnormality in the device.

Effect 11; I Changes in pressure values when mud pressures P2, P3, P4, atmospheric pressure PO, and the pressure inside the supply pipe 5 are defined as Pl are as shown in FIG.

That is, the pressure P1 in the supply pipe 5 shows a maximum pressure value P1'' while oil is being discharged from the intermittent supply source 4, and shows a pressure value P1'' equal to the atmospheric pressure PO when oil is not being discharged.

The pressure P2 is approximately equal to the maximum pressure r'tipi' since the check valve 9 is closed when the oil is discharged from the intermittent supply W; The pressure rises to an approximate predetermined pressure value P2'.When the predetermined pressure value P2' is reached, the reverse valve 9 is opened and lubricating oil is supplied to the gas-oil mixer 7. The pressure is decreased by 1ζ to a predetermined pressure value P2'.

When the oil discharge from the intermittent supply source 4 ceases, the check valve 9 is closed and the reverse flow of oil is prevented by the reverse valve 8, so that the pressure P2 starts the next discharge from the intermittent supply source 4. The predetermined pressure value P2'"(P2">PL") is maintained until the predetermined pressure value P2'"(P2">PL").

The pressure P3 is set to PO<Pa< by the throttle 10 and the throttle 11.
The relationship is P4, and since the amount of lubricating oil injected into the gas-oil mixer 7 is small, it is hardly affected by pressure changes due to the injection of lubricating oil, so P3=constant.

The pressures P2 and Pa fluctuate as shown in FIG. 3 due to the following abnormalities.

(1) If the constant loss oil discharge device 6 fails and a fixed amount of lubricating oil is not discharged, the pressure P
2 increases, and then decreases to the value of the pressure value P2' or the value of Pa.

(P2'> Pa) (2) If a blockage occurs on the way from the oil discharging device 6 to the gas/oil mixer 7 and oil is not discharged to the gas/oil mixer 7, the intermittent oil supply source 4 Even if no oil is discharged, the pressure P2
When the pressure drops, the pressure increases to the value of P2'' or the value of pb.

(P2゛<Pb) (3) If a blockage occurs on the way from the gas/oil mixer 7 to the lubricated part 2 and the predetermined M air is not supplied to the lubricated part, the pressure will rise to the value of P3 or Pc. do.
(Pa<Pc) (4) If a tear or the like occurs in the pipe line on the way from the gas/oil mixer 7 to the oiled part 2, and air leaks from there, a predetermined amount of air cannot be supplied to the oiled part,
Pressure P3 drops to the value of Pd. (P 3 > P
d,) Therefore, it is possible to detect an abnormality in the device by monitoring the fluctuations in the pressures P2 and Pa. In the present invention, the fluctuations in the pressure P2 are detected as fluctuations in the pressure difference between the atmospheric pressures PO and P2. A pressure sensor 13 detects a change in the pressure P3 as a change in the pressure difference between the pressure P4 and Pa, and a first detection stage 14 detects whether this detected value deviates from a predetermined value. to detect equipment abnormalities.

Embodiment As shown in FIG. 1, the pump 1 for generating compressed air is connected to the main pipe 31 of the air supply pipe 3, and
It branches into a plurality of branch pipes 32 on the downstream side, each extending into the power supply skin supply section 2.

Reference numeral 4 denotes an intermittent oil supply source that intermittently discharges lubricant tr1 oil, and this intermittent oil supply source 4 includes a piston that is reciprocated by compressed air supplied from another branch pipe 33 branched from the air supply pipe 3. It consists of a pump. The drive of the pump is controlled by a solenoid valve 16 whose opening and closing are controlled by a control device 15 such as a timer, and lubricating oil is supplied to the oil supply pipe 5 by the reciprocating movement of the piston by check valves 17 and 18 provided before and after the pump. It has become so.

Reference numeral 19 denotes a depressurizing device which, when lubricating oil is discharged from the oil supply source 4, cuts off the oil tank 20 and the counterflow pipe line 21 by increasing the pressure P1 in the oil supply pipe 5, so that all the holes are connected to the oil supply pipe 5. At the same time, when there is no discharge of lubricating oil from the oil supply source 4, the pressure P1 in the oil supply pipe 5 decreases, thereby connecting the counterflow pipe 21 and the oil tank 20, and reducing the pressure in the oil supply pipe 5. The residual pressure inside the oil supply pipe 5 is removed by making P1 equal to the atmospheric pressure PO.

By removing the residual pressure within the oil supply pipe S, the amount of oil discharged from the oil supply source 4 can be kept constant.

6 is a constant 1jX discharge device that intermittently discharges a small and constant amount of oil supplied from the intermittent supply 7t1+ source 4 through the oil supply pipe 5, The oil is discharged to the gas/oil mixer 7 through the gas/oil mixer 7.

The air/oil mixer 7 supplies the oil discharged from the metered oil dispensing device 6 into the flow of compressed air in the branch pipe 32, and transports the oil to the oiled part 2 by the flow of compressed air. Oil and air are simultaneously supplied to the oiled part 2.

Reference numeral 22 represents a nozzle that sprays a mixed gas of oil and air onto the oiled portion 2 .

...The check valve 8 described in I prevents the backflow of oil from the gas-oil mixer 7 to the metered oil dispensing device 6, and the check valve 9 prevents an increase or decrease in the pressure of the lubricating oil discharged from the check valve 8. The opening area and spring force are adjusted to open and close when a predetermined value is reached.

A conduit 34 on the upstream side of the gas/oil mixer 7 of the branch pipe 32 and a conduit 35 on the downstream side of the gas/oil mixer 7 are each provided with a throttle 10.
, a throttle 11 is provided, and the pressure P in the pipe on the upstream side of the throttle 11 is
3 is set so that the relationship between the respective pressures is PO<P3<Pd, where Pd is the pressure in the pipe on the upstream side of the throttle 10, and PO is the atmospheric pressure.

Note that the pressure P3 on the upstream side of the throttle 11 is almost unaffected by pressure changes due to the injection of lubricating oil because the amount of lubricating oil injected from the constant oil dispensing device 6 into the gas-oil mixer 7 is small. = constant.

The aperture 11 also has a constriction effect on the nozzle 22, so
This nozzle 22 may also be used.

12 and 13 are pressure sensors, respectively, and the pressure sensor 12 is connected to the oil supply path 51 connecting the check valve 8 and the check valve 9.
The pressure sensor 13 detects the pressure difference between the pressure P2 generated in the pipe and the human pressure PO, and the pressure sensor 13 detects the pressure P4 in the pipe on the upstream side of the throttle 10 and the pressure P3 in the pipe on the upstream side of the throttle 11.
Detects the pressure difference between

14 is a detection means that detects an abnormality in the lubricating oil supply device when the pressure value detected by the pressure sensors 12 and 13 deviates from a predetermined value.

The pressures P1, P2, P3, P when the device is activated
The changes in the pressure values of d and atmospheric pressure PO are the second
As shown in the figure.

That is, the pressure P1 in the supply pipe 5 shows the maximum pressure value P1'' while oil is being discharged from the intermittent supply source 4 (time Tl), and when no oil is being discharged (time T'2), it is the atmospheric pressure. P.O.
shows a pressure P1'' equal to .

The pressure P2 is within the range of values determined by the predetermined opening area of the check valve 9, the spring pressure, and the pressure in the pipeline upstream of the check valve 9, that is, the pressure P3 in the pipeline upstream of the calibration 11. When the lubricating oil is discharged from the oil supply source 4, the pressure value rises to P2' (approximately the maximum pressure value P1'), the check valve 9 is opened, and the lubricating oil is transferred to the air-oil mixer 7. supply to

When the reverse valve 9 is opened, the pressure P2 decreases to a pressure value P2''.

When oil is no longer discharged from the intermittent supply source 4, the check valve 9 is closed and the reverse flow of oil is prevented by the reverse valve 8, so that the pressure value P2''(P2'>PL'') is maintained. I will do it.

There are four possible abnormalities in the lubricating oil supply system:

That is, when the m-quantity oil dispensing device 6 malfunctions and a fixed amount of lubricating oil is not discharged.

In this case, even if the oil is discharged from the intermittent oil supply source 4, T1
Within the time, the pressure P2 does not increase and the pressure value P2' decreases to the value Pa as shown in FIG. (P2'
>Pa) (2) Constant [When oil is not discharged to the air/oil mixer 7 due to clogging or the like occurring on the way from the oil discharge device 6 to the air/Ih mixer 7.

In this case, even if no oil is discharged from the intermittent oil supply source 4, the pressure P2 does not decrease, and the pressure value P2''' does not decrease within 12 hours.
The value of Pb increases to the value of Pb as shown in FIG. (P
2'<Pb) (3) When a blockage or the like occurs on the way from the gas/oil mixer 7 to the oiled part 2 and a predetermined amount of air is not supplied to the oiled part.

In this case, the pressure P3 or the pressure Pc as shown in FIG.
Now let's move up to η1. (P3<Pc) (4) A case where a tear or the like occurs in the pipe line on the way from the gas/oil mixer 7 to the oiled part 2, and air leaks from there, and a predetermined amount of air is not supplied to the oiled part.

In this case, either the pressure P3 or the pressure Pd as shown in FIG.
descend to. (P3>Pd) That is, the above pressure P2
The respective fluctuations within T1 and 12 hours are expressed as pressure P
The pressure sensor 12 detects a change in the pressure difference p1p'' between 2 and the atmospheric pressure Po, and the pressure sensor 13 detects a change in the pressure P3 as a change in the pressure difference pIT between the pressures P4 and P3. The pressure difference values p, p', p'' during normal operation are set in the means 14 as a base q value for abnormality determination, and the detected value and the reference value for abnormality determination are synchronized with the times T1 and T2. By comparing the results, it is possible to detect an abnormality in the device.

Note that synchronization of the times T1 and T2 at the time of abnormality determination can be obtained by, for example, interlocking the control device 15, such as the timer, and the detection means 14.

The reference value for abnormality determination can also be set to a level with a certain range.

That is, while the lubricating oil is being discharged from the intermittent oil supply source 4 (time Tl), the fluctuations in the values of the pressure differences p and p'' between PO1P2 due to fluctuations in the pressure P2 are changed to the normal pressure difference value p.
, the reference value is set to a setting level L1 that is slightly smaller than the reference value, and while lubricating oil is not being discharged from the intermittent oil supply source 4 (
Time T2) is set to a setting level L2 that is slightly larger than the normal pressure difference value p' at time T3 when the pressure difference is approximately constant.

In addition, regarding the fluctuation of the pressure difference between P4 and P3 due to the fluctuation of pressure P3, the setting level L3 is set at a slightly larger value than the normal pressure difference value pI+, and the set level L4 is set at a lower F value. Set the reference value.

In addition, il? As mentioned above, the pressure P2 may vary depending on the magnitude of the pressure P3 even when operating normally. This is because the pressure P3 fluctuates slightly even during normal operation due to pulsations when the pump 1 discharges compressed air, etc. Therefore, this pressure P2 has a predetermined pressure fluctuation width q even during normal operation. Therefore, when setting the setting levels LL and L2, Ll is set to T.
If L2 is set to the minimum value of the fluctuation range of pressure P2' during normal operation in 1 hour, and L2 is set to the maximum value of the fluctuation range of pressure P2' during normal operation over 13 hours, the pressure P2 during normal operation will be Fluctuations are not judged as abnormal.

In addition, 23 is a pressure gauge, 24.25 is a pressure switch, and is provided in the branch pipe 33 and the oil supply pipe 5, respectively, and the outer pipe 33.
, 5 itself, and directly detects abnormalities in the intermittent oil supply source 4 and pump 1.

Effects According to the present invention, the metering oil dispensing device 6 may fail and a fixed amount of lubricating oil is not discharged, or a blockage may occur on the way from the metering oil dispensing device 6 to the air/oil mixer 7, causing the oil/oil to flow out. Even if an abnormality occurs in the lubricating oil supply path, such as oil not being discharged to the mixer 7, the abnormality can be detected by monitoring the fluctuation of the "double pressure difference value p1p". .

Furthermore, a blockage or the like occurs on the way from the air/oil mixer 7 to the oiled part 2, and a predetermined amount of air is not supplied to the oiled part.
Alternatively, there may be an abnormality in the compressed air supply path, such as a break in the pipe line on the way from the oil/air mixer 7 to the oiled part 2, and air leaking from there, preventing the specified amount of air from being supplied to the oiled part. Even if this occurs, the abnormality can be detected by monitoring the fluctuation of the pressure difference value p11.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing the configuration of the present invention, Fig. 2 is an explanatory diagram showing changes in pressure in each pipeline in the device, and Fig. 3 shows changes in pressure when there is an abnormality in the device. The explanatory diagram shown in FIG. 4 is a circuit diagram showing a conventional device. ■91. Pump 200. Oiled part 381. Air supply pipe 4001 Intermittent supply source 513. Kyuura tube
691. The setting is oil discharge device 718, air oil mixer 8.90
．． , check valve 10.11. ,,Aperture 12.13. ,,I king sensor 14 ,,,detection means

Claims (1)

[Claims] (1) A pump 1 that generates compressed air, an air supply pipe 3 that guides the compressed air to the lubricated part 2, an intermittent oil supply source 4 that intermittently discharges lubricating oil, and an oil supply pipe from the intermittent oil supply source 4 a metering oil dispensing device 6 that intermittently discharges a small but constant amount of oil supplied through the metering oil discharging device 6; In the lubricating oil supply device that simultaneously supplies oil and air to the lubricated part 2, the lubricating oil supply device includes an air-oil mixer 7 that transports the oil to the lubricated part 2 by a flow of compressed air. In the middle of the passage communicating with the mixer 7, there is a check valve 8 that prevents the backflow of oil from the gas/oil mixer 7 to the metered oil dispensing device 6. A check valve 9 that opens and closes is provided, and a throttle 10 is provided in the pipe line 34 on the upstream side of the gas-oil mixer 7 and the pipe line 35 on the downstream side of the gas-oil mixer 7 of the air supply pipe 3, respectively. A pressure sensor 12 is provided with a throttle 11 and detects the pressure difference between the pressure P2 generated in the passage upstream of the check valve 9 and the atmospheric pressure P0, and the pressure P4 in the passage upstream of the throttle 10. A pressure sensor 13 detects the pressure difference with the pressure P3 in the passage on the upstream side of the throttle 11, and detects an abnormality in the lubricating oil supply device when the pressure value detected by the pressure sensors 12 and 13 deviates from a predetermined value. An abnormality detection device for a lubricating oil supply device, characterized in that it is provided with a detection means 14 for detecting