JPH0223759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present 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.

Conventional technology Conventionally, this type of lubricating oil supply device was developed by
The one described in Japanese Patent No. 58-146792 is known. As shown in the system shown in Fig. 4, an air supply source b is connected to a lubricated part a such as a bearing through air supply pipes c and c', and a side path d branches off from the air supply pipe c. The air supply pipe near the above lubricated part a
c', and an on-off valve e that opens and closes intermittently, a constant oil dispensing device h equipped with an oil supply source g, and an air-oil mixer j are connected in sequence to this side path d, and the opening and closing of the on-off valve e is connected in sequence. 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 this 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 m and n are pressure gauges.

Therefore, the lubricated part a is always continuously supplied with an appropriate amount of non-mist lubricating oil by the flow of compressed air, and the compressed air itself is also used to cool the lubricated part a. a is always placed under optimal rotation conditions.

Problems to be Solved by the Invention In such a conventional lubricating oil supply method, the amount of lubricating oil supplied to the lubricated part a is extremely small, so it is necessary to reliably supply the lubricating oil. However, in reality, a situation occurs where reliable supply is no longer possible due to abnormalities such as clogging of the nozzle k, failure of a valve, or damage to piping.

Therefore, in preparation for the occurrence of such an abnormal situation,
Pressure gauges m and n are attached to the air supply pipe c and the side passage d near the air supply source b, and abnormalities are detected by monitoring the pointers of the pressure gauges m and n, but there are the following problems.

1 At the location where the pressure gauge n is installed, it is not possible to detect whether the metered oil dispensing device h is operating reliably and a fixed amount of lubricating oil is being normally and intermittently discharged, and the status of the supply of lubricating oil to the above-mentioned lubricated part a cannot be accurately grasped. .

2. At the location where the pressure gauge m is installed, a break or blockage occurs in the pipe between the air-oil mixer j and the nozzle k, making it impossible to detect whether the specified amount of air is being reliably discharged from the nozzle k. The air supply status to the oil supply section a cannot be accurately grasped.

It is an object of the present invention to solve the above-mentioned problems and to accurately detect an abnormality in the supply of lubricating oil and air to a lubricated part.

Means for Solving the Problems In order to solve the above problems, the present invention provides a pump 1 for generating compressed air, as shown in FIG.
and an air supply pipe 3 that guides the compressed air to the lubricated part 2.
and an intermittent oil supply source 4 that intermittently discharges lubricating oil.
a metering oil discharging device 6 that intermittently discharges a small but constant amount of oil supplied from the intermittent oil supply source 4 through the oil supply pipe 5; 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 supplies the oil into the flow of air and transports the oil to the lubricated part 2 by the flow of compressed air. A metering oil dispensing device 6 is connected from the gas/oil mixer 7 to the gas/oil mixer 7 in the middle of a passage connecting the metered oil discharging device 6 and the gas/oil mixer 7.
A first check valve 8 that prevents backflow of oil to the air supply, and a second check valve 9 that opens and closes depending on changes in the pressure of the oil discharged from the first check valve 8 are provided. A first throttle 10 is provided in the pipe line 34 on the upstream side of the gas-oil mixer 7 of the pipe 3, a second throttle 11 is provided in the pipe line 35 on the downstream side of the gas-oil mixer 7, and the second check valve Pressure P2 generated in the upstream passage of 9 and atmospheric pressure
A first pressure sensor 12 that detects the value of the pressure difference between P0 and the pressure P4 in the passage upstream of the first throttle 10 and the pressure P3 in the passage upstream of the second throttle 11.
a second pressure sensor 13 that detects the value of the pressure difference between
and a detection means 14 for detecting an abnormality in the lubricating oil supply device when the pressure values detected by the first pressure sensor 12 and the second pressure sensor 13 deviate from a predetermined value. An abnormality detection device for a supply device is provided.

Effect When the pressures P2, P3, P4, atmospheric pressure P0, and the pressure inside the supply pipe 5 are set as P1, the changes in the respective pressure values are as shown by solid lines in FIG.

That is, in FIGS. 1 and 2, 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 T1),
(P1=P1′) When no oil is discharged (time T2), the pressure value P1″ is equal to the atmospheric pressure P0.

(P1=P1″=P0) Pressure P2 changes as follows during the above time T1.
That is, the pressure P2 is equal to the maximum pressure value because the second check valve 9 is closed when oil is discharged from the intermittent supply source 4 through the constant oil discharge device 6 and the first check valve 8.
The pressure increases to a predetermined pressure value P2' which is approximately approximate to P1'. (P2=P2') When the predetermined pressure value P2' is reached, the second check valve 9
is opened and lubricating oil is supplied to the gas-oil mixer 7, and the second check valve 9 is opened, which lowers the pressure to a predetermined pressure value P2''. (P2=P2'') Then, the intermittent supply source 4 When the oil is no longer discharged, the second check valve 9 is closed and the first check valve 8 prevents the oil from flowing back, so that the pressure is reduced.
P2 until the intermittent supply source 4 starts the next discharge.
That is, the reduced pressure value P2'' is maintained during the time T2.

At this time, the pressure value P2″ is the pressure value inside the supply pipe 5.
(P2″>P1″) The pressure P3 has a relationship of P0<P3<P4 due to the first throttle 10 and the second throttle 11, and the lubricating oil injected into the air-oil mixer 7 is small. Therefore, P3 is almost unaffected by pressure changes due to lubricating oil injection, so P3
becomes constant. (P3=constant) The above pressures P2 and P3 fluctuate as shown in Fig. 3 due to the following abnormalities.

(1) If the metered oil discharge device 6 malfunctions and a fixed amount of lubricating oil is not discharged, even if oil is discharged from the intermittent oil supply source 4, oil will not be discharged from the metered discharge oil device 6, so the second check valve 9 The pressure rise in the upstream pipe line is almost eliminated.

Therefore, the pressure P2 in the pipe line does not rise to the predetermined value P2' shown by the broken line in FIG. 3, but decreases to a certain value Pa shown by the solid line in FIG.

(P2=Pa, Pa<P2′) (2) If a blockage occurs on the way from the metered oil dispensing device 6 to the gas/oil mixer 7 and oil is not discharged to the gas/oil mixer 7, the second Even if the check valve 9 is opened, almost no pressure drop in the pipe line occurs due to the clogging.

Therefore, the pressure P2 decreases only slightly and remains at a certain value Pb greater than the predetermined pressure value P2'' shown by the broken line in FIG.

(P2=Pb, Pb>P2″) (3) If a blockage 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, the value of pressure P3 ( (shown with a broken line) increases to a certain pressure value Pc due to clogging.

(P3<Pc) (4) If a break 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 the specified amount of air is not supplied to the oiled part, the pressure
The value of P3 (indicated by a broken line) drops to a certain pressure value Pd due to air leakage.

(P3>Pd) Therefore, by monitoring the fluctuations in the pressures P2 and P3, it is possible to detect an abnormality in the device.

In the present invention, the first pressure sensor 12 detects fluctuations in the pressure value of pressure P2 in each time period T1 and T2 as fluctuations in the pressure difference between atmospheric pressures P0 and P2, and detects fluctuations in the value of pressure P3 as fluctuations in the pressure difference between atmospheric pressures P0 and P2. The second pressure sensor 13 detects a variation in the value of the pressure difference between the pressures P4 and P3, and the detection means 14 detects whether or not this detected value deviates from a predetermined value, thereby detecting an abnormality in the apparatus.

Embodiment As shown in FIG. 1, a pump 1 that generates compressed air is connected to a main pipe 31 of an air supply pipe 3, and the main pipe 31 branches into a plurality of branch pipes 32 on the downstream side, each of which connects the oiled part 2. looking into the sky.

4 is an intermittent oil supply source that discharges lubricating oil intermittently, and this intermittent oil supply source 4 is reciprocated by compressed air supplied from another branch pipe 33 branched from the air supply pipe 3. It consists of a piston 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 by check valves 17 and 17 provided before and after the pump.
18, lubricating oil is supplied to the oil supply pipe 5 by the reciprocating movement of the piston.

Reference numeral 19 denotes a depressurization device which, when lubricating oil is discharged from the oil supply source 4, cuts off the oil tank 20 and the return flow pipe 21 by increasing the pressure P1 in the oil supply pipe 5, so that all the oil is removed from the supply. At the same time, when no lubricating oil is discharged from the oil supply source 4, the pressure P1 in the oil supply pipe 5 decreases to connect the return flow pipe 21 and the oil tank 20, and the oil supply pipe 5
The pressure inside the oil supply pipe 5 is made equal to the atmospheric pressure P0.
This is to remove the residual pressure inside.

By removing the residual pressure in the oil supply pipe 5, the amount of oil discharged from the oil supply source 4 can be kept constant.

Reference numeral 6 denotes a metering oil dispensing device that intermittently discharges a small, constant amount of oil supplied from the intermittent oil supply source 4 through the oil supply pipe 5, and includes a first check valve 8, an oil supply path 51,
The oil is discharged to the gas-oil mixer 7 via the second check valve 9.

The oil/air mixer 7 supplies the oil discharged from the metered oil dispensing device 6 into the flow of compressed air in the branch pipe 32, transports the oil to the oiled part 2 by the flow of compressed air, and mixes the oil with the oil. At the same time, air is supplied to the lubricated part 2.

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

The first check valve 8 prevents backflow of oil from the gas/oil mixer 7 to the metered oil dispensing device 6, and the second check valve 9
The opening area and spring force are adjusted so that the check valve opens and closes when the increase or decrease in the pressure of the lubricating oil discharged from the first check valve 8 reaches a predetermined value.

Pipe line 34 on the upstream side of the oil and gas mixer 7 in the branch pipe 32
A first throttle 10 and a second throttle 11 are provided in the pipe line 35 on the downstream side of the gas-oil mixer 7, respectively.
The pressure in the pipeline upstream of the throttle 11 is P3, the pressure in the pipeline upstream of the first throttle 10 is P4, and the atmospheric pressure is
When P0 is set, the relationship between each pressure is set to be P0<P3<P4.

Note that the pressure P3 on the upstream side of the second throttle 11 is
Since the amount of lubricating oil injected from the metered oil dispensing device 6 into the air-oil mixer 7 is small, it is hardly affected by pressure changes due to the injection of lubricating oil, so it is not affected by the oil discharge from the intermittent oil supply source 4. becomes constant.

(P3=constant) The second diaphragm 11 also has a diaphragm effect on the nozzle 22, so the nozzle 22 may also serve as the second diaphragm 11.

12 and 13 are first and second pressure sensors, respectively, and the first pressure sensor 12 is
The second pressure sensor 13 detects the value of the pressure difference between the pressure P2 generated in the oil supply path 51 connecting the check valve 8 and the second check valve 9 and the atmospheric pressure P0. Pressure P4 in the pipe on the upstream side of
The value of the pressure difference with the pressure P3 in the upstream pipe line of No. 1 is detected.

14 is a detection means for detecting an abnormality in the lubricating oil supply device when the pressure values detected by the first pressure sensor 12 and the second pressure sensor 13 deviate from a predetermined value.

The pressures P1, P2, when the device operates
Changes in the pressure values of P3, P4, and atmospheric pressure P0 are shown in FIG.

In other words, 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 T1), and (P1 = P1') when oil is not being discharged (time T2). ) indicates a pressure P1″ equal to atmospheric pressure P0.

(P1=P1″=P0) Pressure P2 changes as follows during the above time T1.

That is, the pressure P2 depends on the predetermined opening area of the second check valve 9, the spring pressure, and the pressure inside the pipe on the upstream side of the second check valve 9, that is, the pressure inside the pipe on the upstream side of the second throttle 11. When the oil supply source 4 discharges lubricating oil, the pressure value increases to a pressure value P2' that is almost approximate to the maximum pressure value P1' of the above-mentioned P1, and the second check valve 9 is opened to supply lubricating oil to the air/oil mixer 7.

(P2=P2'') Then, when the second check valve 9 opens, the pressure P2 decreases to the pressure value P2''. (P2=P2″) When the oil is no longer discharged from the intermittent supply source 4, the second check valve 9 is closed and the first check valve 8 prevents the oil from flowing back, so that the pressure decreases. value
P2″ is until the intermittent oil supply source 4 starts the next discharge.
That is, during the T2 time, the pressure value P2'' is maintained as it is.

At this time, the pressure value P2″ is the pressure value inside the supply pipe 5.
It is larger than P1″.

(P2″>P1″) Next, there are the following four abnormalities in the lubricating oil supply system.
There are two possibilities.

That is, to explain based on FIG. 3, (1) A case where the metering oil dispensing device 6 breaks down and a fixed amount of lubricating oil is not discharged.

In this case, even if oil is discharged from the intermittent oil supply source 4, the amount of oil discharged from the metered oil dispensing device 6 is small, and therefore, within time T1, the pressure P2 is reduced to the predetermined value P2' (broken line (as shown in the figure).
As shown by the solid line, the pressure P2 only increases to the value of Pa (shown by the solid line).

(P2=Pa, Pa<P2') (2) When a blockage occurs on the way from the metered oil dispensing device 6 to the gas/oil mixer 7, and oil is not discharged to the gas/oil mixer 7.

In this case, even if the second check valve 9 is opened, the pressure inside the oil supply pipe 51 will hardly decrease due to the blockage.

Therefore, the pressure P2 decreases only slightly, and only decreases to the pressure Pb (indicated by a solid line) which is greater than the predetermined pressure value P2'' (indicated by a broken line) within time T2.

(P2=Pb, Pb>P2″) (3) When a blockage occurs on the way from the gas/oil mixer 7 to the oiled part 2, and the specified amount of air is not supplied to the oiled part.

In this case, the pressure P3 shown by the broken line increases to a certain pressure value Pc (shown by the solid line) as shown in FIG. 3 due to the blockage.

(P3<Pc) (4) When a break occurs in the pipe line on the way from the gas/oil mixer 7 to the oiled part 2, and air leaks from there, preventing the specified amount of air from being supplied to the oiled part.

In this case, the pressure P3 shown by the broken line drops to a certain pressure value Pb (shown by the solid line) due to air leakage. (P3>Pb) In other words, the peak values of the pressure fluctuations of the above pressure P2 within time T1 and T2 are expressed as the fluctuations in the peak values of the pressure differences p and p' between the pressure P2 and the atmospheric pressure P0. 1 Pressure sensor 12 detects and pressure
The second pressure sensor 13 detects the fluctuation in the pressure value of P3 as a fluctuation in the pressure difference value p'' between the pressures P4 and P3, and the detection means 14 detects the peak value p of the pressure difference value during normal operation. , p′, p″ are set as reference values for abnormality determination, and the detected values and the reference values for abnormality determination are compared in synchronization with the times T1 and T2, thereby detecting an abnormality in the device. Can be done.

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

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

In other words, the fluctuations in the peak values of the pressure difference values p and p' between P0 and P2 due to fluctuations in pressure P2 are calculated while lubricating oil is being discharged from the intermittent oil supply source 4 (time T1).
The reference value is set to a set level L1 that is slightly smaller than the normal pressure difference value p, and if it falls below this level L1, it is considered abnormal, and while lubricating oil is not being discharged from the intermittent oil supply source 4. (time T2) is the time T3 when the pressure difference is almost constant
In this case, a set level L2 is set which is slightly larger than the normal pressure difference value p', and if the pressure difference exceeds this level L2, it is considered abnormal.

Regarding the fluctuation of the pressure difference value between P4 and P3 due to the fluctuation of pressure P3, there is a setting level L3 which is slightly larger than the normal pressure difference value p'', and a setting level L4 which is slightly smaller. A reference value is set for , and an abnormality is determined when it exceeds this level L3 or falls below level L4.

Note that, as described above, the pressure P2 may fluctuate depending on the magnitude of the pressure P3 even when operating normally. This is because the value of pressure P3 fluctuates slightly even during normal operation due to pulsations when the pump 1 discharges compressed air. However, since it has a predetermined pressure fluctuation width q, when setting the setting levels L1 and L2,
If L1 is set to the minimum value of the fluctuation range of pressure P2′ during normal operation at time T1, and L2 is set to the maximum value of the fluctuation range of pressure P2″ during normal operation during time T3, then
Fluctuations in pressure P2 during normal operation will not be judged as abnormal.

Note that 23 is a pressure gauge, and 24 and 25 are pressure switches, which are divided into a branch pipe 33 and an oil supply pipe 5, respectively, so that pressure changes in the outer pipes 33 and 5 themselves can be detected. It directly detects abnormalities.

Effects According to the present invention, if the metered oil dispensing device 6 breaks down and a fixed amount of lubricating oil is not discharged, or if a blockage occurs on the way from the metering oil dispensing device 6 to the air/oil mixer 7, the gas/oil mixing is interrupted. Even if an abnormality occurs in the lubricating oil supply path, such as oil not being discharged to the container 7, the abnormality can be detected by monitoring the fluctuations in the pressure difference values p and p'. can.

Furthermore, a blockage may occur on the way from the air/oil mixer 7 to the oiled part 2, and a predetermined amount of air cannot be supplied to the oiled part, or a pipe may become clogged on the way from the gas/oil mixer 7 to the oiled part 2. Even if an abnormality occurs in the compressed air supply path, such as when a tear occurs in the road and air leaks from it, preventing the specified amount of air from being supplied to the lubricated part, the change in the pressure difference value p'' is monitored. This allows the abnormality to be detected.

[Brief explanation of drawings]

Figure 1 is a system diagram showing the configuration of this invention.
Fig. 2 is an explanatory diagram showing changes in pressure in each pipe line in the device, Fig. 3 is an explanatory diagram showing changes in pressure when an abnormality occurs in the device, and Fig. 4 is a circuit diagram showing a conventional device. It is. DESCRIPTION OF SYMBOLS 1... Pump, 2... Lubricated part, 3... Air supply pipe, 4... Intermittent oil supply source, 5... Oil supply pipe, 6... Constant oil dispensing device, 7... Air and oil mixer, 8... First check valve, 9...Second check valve, 10...First throttle, 11
...Second aperture, 12...First pressure sensor, 13
...Second pressure 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 a lubricated part 2, an intermittent oil supply source 4 that intermittently discharges lubricating oil, and the intermittent oil supply source 4 a metering oil discharge device 6 that intermittently discharges a small, constant amount of oil supplied through the oil supply pipe 5; In the lubricating oil supply device that simultaneously supplies oil and air to the lubricated portion 2, the lubricating oil supply device comprises an air-oil mixer 7 that conveys the oil to the lubricated portion 2 by a flow of compressed air. A metering oil dispensing device 6 is installed from the gas and oil mixer 7 in the middle of the passage connecting the gas and oil mixer 7.
a first check valve 8 that prevents backflow of oil to the air supply; and a second check valve 9 that opens and closes depending on changes in the pressure of the oil discharged from the first check valve 8; A first throttle 10 is provided in the pipe line 34 on the upstream side of the gas-oil mixer 7 of the pipe 3, and a second throttle 1 is provided in the pipe line 35 on the downstream side of the gas-oil mixer 7.
1 and detecting the value of the pressure difference between the pressure P2 generated in the upstream passage of the second check valve 9 and the atmospheric pressure P0; The pressure P4 in the passage of
A second pressure sensor 13 detects the value of the pressure difference between the pressure P3 and the pressure P3 in the passage on the upstream side of the second throttle 11, and the pressure values detected by the first pressure sensor 12 and the second pressure sensor 13 are set to a predetermined value. 1. An abnormality detection device for a lubricating oil supply device, characterized in that it is provided with a detection means 14 for detecting an abnormality in the lubricating oil supply device when the device deviates from the above.