JP2004084680A - Oil air lubrication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil air lubrication system having high safety which eliminates the occurrence of a lubrication failure by surely capturing dust, chips, or the like causing a seal failure of a check valve on the upstream side from the check valve and preventing the seal failure of the check valve. <P>SOLUTION: In the oil air lubrication system, a check valve 17 which prevents back flow of the air to a fixed quantity distributor 13 is incorporated in the middle of an oil flow path 16 connecting the oil discharging part of the fixed quantity distributor 13 quantitatively discharging the oil supplied from the lubrication oil supply pump, with an oil/air mixing chamber 44 so as to supply the oil air generated in the oil/air mixing chamber 44 into the lubrication part. A filter 18 is provided between the fixed quantity distributor 13 and the check valve 17 in the middle of the oil flow path 16, and the occurrence of the seal failure of the check valve 17 is prevented by capturing dust, chips, or the like with the filter 18. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides an oil-air lubrication system that supplies a small amount of lubricating oil into air from a compressed air supply source, mixes the lubricating oil to generate oil air, and supplies the oil air to a lubricating portion of a machine element that is a member to be lubricated. About the system.
[0002]
[Prior art]
The oil-air lubrication system, which is used to supply oil-air to the lubrication parts of machine elements, has an oil-air mixing chamber for mixing oil and air in the air passage through which air from the compressed air supply passes. An oil discharge part of a fixed quantity distributor for fixedly discharging the oil supplied from the lubricating oil supply pump, and a reverse part for preventing backflow of air to the fixed quantity distributor in the middle of an oil flow path connected to the oil / air mixing chamber. A mixing valve is configured by incorporating a stop valve, and oil air generated in an oil / air mixing chamber of the mixing valve is supplied to a lubricating portion to utilize an oil lubricating action and an air cooling action.
[0003]
By the way, in the mixing valve as described above, the air flows backward to the fixed amount distributor side in the oil pipe, and the pressure rise of the oil line becomes poor, so that an alarm is generated and the lubricating oil supply pump often stops.
[0004]
Most of these situations are caused by poor sealing of the check valve built into the mixing valve. This check valve is used to remove dust and chips contained in the oil supplied from the metering device. And the like adhere to the sealing surface, resulting in poor sealing.
[0005]
When the above-mentioned check valve becomes defective in seal, air flows backward from the oil / air mixing chamber into the fixed quantity distributor, and the fixed quantity distributor cannot perform accurate measurement. Accidents such as burnout may occur in the lubricated part.
[0006]
The mixing of dust, chips, and the like, which cause the above-described check valve to have a bad seal, can include the following causes.
[0007]
(1) Residual garbage and chips from parts processing.
[0008]
(2) Chips generated from the screw during assembly of the mixing valve.
[0009]
(3) Dirt and chips generated from the thread when connecting the oil piping.
[0010]
(4) Dust and chips that are mixed in the oil during operation and flow into the mixing valve from the oil main pipe.
[0011]
(5) Wear powder generated by friction of internal parts due to continuous operation.
[0012]
Conventionally, as a measure to prevent the mixing of dust, chips, etc. as described above,
[0013]
Cause (1) can be largely eliminated by cleaning the parts.
[0014]
Cause (3) can be almost completely eliminated by flushing after piping work.
[0015]
Cause (4) can be almost completely eliminated by installing a line filter for the oil main pipe.
[0016]
[Problems to be solved by the invention]
Conventionally, no countermeasures have been taken against the above causes (2) and (5), and therefore, the causes (2) and (5) have mainly caused the seal failure of the check valve.
[0017]
Regarding the countermeasure for the cause (3), in the conventional line filter, it is necessary to reconnect the outflow side and the mixing valve to the mixing valve again by piping, and the cause (3) is induced at this connection portion.
[0018]
Also, measures against the above causes (1) and (3) are difficult to confirm whether the work has been performed sufficiently, and are not reliable and complete measures.
[0019]
Therefore, an object of the present invention is to reliably prevent dust, chips, and the like that cause a seal failure of a check valve in front of the check valve and to prevent the occurrence of poor lubrication by preventing the seal failure of the check valve. To provide a highly safe oil-air lubrication system.
[0020]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an oil / air mixing chamber for mixing oil and air in an air passage through which air from a compressed air supply source passes, and a lubricating oil supply pump. The oil discharge part of the fixed amount distributor that discharges the supplied oil in a fixed amount and the check valve that prevents the backflow of air to the fixed amount distributor are installed in the oil passage connected to the oil / air mixing chamber. An oil-air lubrication system in which oil air generated in an air mixing chamber is supplied to a lubrication part, wherein a configuration in which a filtration filter is provided between a fixed amount distributor and a check valve in the middle of the oil flow path is adopted. is there.
[0021]
Since the filtration filter is located on the upstream side of the oil flow path with respect to the check valve, the causes (2) and (5) of the seal failure of the check valve described above can be surely eliminated, and the cause (1). It will work effectively as a measure for ▼, ③ and 、.
[0022]
The filter is made of an elastic material that is softer in material than the member to be mounted, and is press-fitted into the member to be mounted so that dust, chips and the like are not generated at the time of mounting.
[0023]
Here, a damper mechanism is provided between the fixed amount distributor and the filtration filter in the middle of the oil flow path, and the operating pressure of the damper mechanism is set equal to or less than the valve-closing elasticity of the check valve, and It can be set to operate at a pressure lower than the oil pressure discharged from the distributor, so that clogging generated in the filter can be detected by operation of the damper mechanism.
[0024]
In the above damper mechanism, the pressure of the spring pressing the damper piston is set to be lower than the pressure of the oil discharged from the metering device, and the operating pressure of the check valve is equal to the pressure of the oil discharged from the metering device. When the hydraulic pressure acting on the damper piston increases due to clogging of the filtration filter, the damper indicator connected to the damper piston protrudes to the outside, and is visually or detected by the sensor. Thus, it is possible to confirm the occurrence of clogging of the filtration filter.
[0025]
In addition, an oil / air mixing chamber for mixing oil and air is provided in the air passage through which air from the compressed air supply source passes, and a fixed quantity distributor for fixedly discharging oil supplied from the lubricating oil supply pump. A check valve that prevents backflow of air to the fixed amount distributor is installed in the oil discharge section and the oil flow path connected to the oil-air mixing chamber, and the oil-air generated in the oil-air mixing chamber is used for the lubrication section. In the oil-air lubrication system adapted to supply oil, the oil main pipe through which the oil supplied from the lubricating oil supply pump passes is connected to the oil inlet of the metering distributor. And a pressure switch is provided on the oil line filter on the downstream side of the oil flow from the fixed amount distributor. It can be adopted.
[0026]
In the connection of the oil main pipe and the pressure switch to the member to be mounted, a connection structure is employed in which dust, chips and the like do not enter the oil passage during the connection operation.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0028]
FIG. 1 shows the overall structure of the oil-air lubrication system of the present invention, FIG. 2 shows an enlarged view of the metering device, and FIG. 4 shows a circuit diagram thereof.
[0029]
As shown in FIGS. 1, 2 and 4, the mixing valve 11 constituting the oil-air lubrication system includes a valve block 12, a fixed amount distributor 13 for the oil supplied from the lubricating oil supply pump P, and an air main pipe 14. In the middle of the oil / air mixing mechanism 15 connected and the oil flow path 16 connecting the oil discharge portion of the fixed quantity distributor 13 and the oil / air mixing mechanism 15, the reverse to prevent the backflow of air to the fixed quantity distributor 13 A stop valve 17, a filtration filter 18 is provided between the fixed amount distributor 13 and the check valve 17, and a variable volume damper mechanism 19 is provided in the oil flow path 16 between the fixed amount distributor 13 and the check valve 17. It is formed.
[0030]
The fixed quantity distributor 13 divides a cylinder chamber 20 provided in the valve block 12 into a lower oil storage chamber 22 and an upper pressure receiving chamber 23 by a movable piston 21. An oil passage 25 is provided along the axis to urge the elasticity of movement toward the chamber 23 and communicates between the oil storage chamber 22 and the pressure receiving chamber 23. The oil passage 26 connects the pressure receiving chamber 23 to the lubricating oil supply pump P. An umbrella valve 27 is movably provided on the oil inlet side of the pressure receiving chamber 23, and the umbrella valve 27 is provided with a spring 28 in a direction in which the upper end of the oil passage 25 on the pressure receiving chamber 23 side is always closed. Energizing elasticity.
[0031]
The volume of the oil storage chamber 22 is defined by a fixed amount nipple 29 screwed to the valve block 12, and the umbrella type valve 27 is opened to the fixed amount nipple 29 to continuously discharge oil during an air bleeding operation. An opening means 30 capable of holding the state is provided.
[0032]
The opening means 30 urges a piston 32 housed in the chamber 31 of the fixed amount nipple 29 so as to be freely movable in the axial direction by a spring 33 to always elastically return to the outer end side with a spring 33 and connects the lower end to the piston 32. When the operating member 35 attached to the outer end of the piston 32 is pushed in against the spring 33, the shaft pin 34 passes through the oil passage 25 and the upper end thereof faces the umbrella valve 27. Holds the umbrella-type valve 27 at the valve opening position of the oil passage 25, whereby the oil passage 26 and the oil storage chamber 22 are directly communicated with each other, and the oil from the oil passage 26 is continuously transmitted to the check valve 17 side. By discharging the air in a continuous manner and entraining and discharging air by continuous discharge, air can be easily and reliably removed from the fixed quantity distributor 13 and the check valve 17.
[0033]
In the oil discharging step of the fixed quantity distributor 13, the pressure oil supplied from the oil passage 26 pushes and opens the umbrella type valve 27 from the oil inlet 48 of the fixed quantity distributor 13 and flows into the pressure receiving chamber 23. The umbrella valve 27 closes the upper end of the oil passage 25 to cut off the communication between the oil inlet 48 of the fixed quantity distributor 13 and the oil storage chamber 22, and moves the piston 21 toward the oil storage chamber 22. Then, the oil in the oil storage chamber 22 is discharged to the check valve 17 through the oil flow path 16.
[0034]
Further, in the oil storage step, when the supply of the pressure oil is cut off, the piston 21 is pushed back to the pressure receiving chamber 23 side by the spring 24, and at this time, the umbrella type valve 27 is expanded and the oil inlet 48 of the fixed quantity distributor 13 is opened. The oil in the pressure receiving chamber 23 flows into the oil storage chamber 22 by closing the communication between the pressure receiving chamber 23 and the oil receiving chamber 23, and simultaneously opening the upper end of the oil passage 25 to communicate the pressure receiving chamber 23 with the oil storing chamber 22. It will be ready for ejection.
[0035]
The check valve 17 is located between the fixed quantity distributor 13 and the oil / air mixing mechanism 15, and its inlet communicates with the oil storage chamber 22 of the fixed quantity distributor 13 via the oil flow path 16. The elasticity in the direction in which the inlet is always closed is urged, and the oil flow is directed upward from the bottom toward the upper outlet in FIG. 1, and the oil flow is arranged in the valve block 12 so as to prevent the reverse air flow. The air from the oil / air mixing mechanism 15 is effectively prevented from entering the fixed quantity distributor 13.
[0036]
The damper mechanism 19 is disposed coaxially below the check valve 17, and has a volume of the chamber 37 in a chamber 37 provided in the valve block 12 so as to communicate with the inlet of the check valve 17 and the oil flow path 16. Is built in such a manner as to be movable in the vertical axis direction, and the piston 38 is formed by applying a spring 39 with elasticity in a direction to constantly pressurize the oil in the chamber 37.
[0037]
The elasticity of the spring 39 in this damper mechanism 19 is
(A) Spring 39 of damper mechanism 19 <air pressure
(B) The spring 39 of the damper mechanism 19 <the pressure of the oil discharged from the fixed quantity distributor 13
(C) The spring 39 of the damper mechanism 19 ≦ the spring 36 of the check valve 17
Is set to the condition.
[0038]
The above (a) is a secondary use of the damper mechanism 19 that can be confirmed by projecting the damper mechanism 19 when the check valve 17 is defective, and (b) is a damper that can be confirmed by projecting the damper mechanism 19 when the internal filter is defective. The secondary use of the mechanism 19, (c), can achieve the purpose of use of the damper mechanism 19, which can accumulate pressure in the damper mechanism 19 when the fixed-quantity distributor 13 discharges oil.
[0039]
An indicator pin 40 that moves integrally with the piston 38 is provided on the piston 38 of the damper mechanism 19 so that the position of the piston 38 can be checked from the outside.
[0040]
The indicator pin 40 protrudes outside the damper mechanism 19, and the current position of the piston 38 can be visually checked or detected by a sensor based on a change in the amount of protrusion due to the movement of the piston 38.
[0041]
The filtration filter 18 is incorporated at a position located on the upstream side of the oil flow path 16 with respect to the check valve 17 at a position coaxially facing the piston 38 of the damper mechanism 19, and by removing the damper mechanism 19, The filter 18 can be replaced.
[0042]
When the oil discharged from the fixed-quantity distributor 13 contains dirt, chips, and the like, the filtration filter 18 captures the dirt and chips to prevent the oil from flowing out to the check valve 17. The filter 18 is made of an elastic material that is softer than the valve block 12 in terms of material, so that dust, chips, and the like are not generated when the filter 18 is mounted by being pressed into the valve block 12.
[0043]
Here, the elasticity of the spring 39 that urges the piston 38 of the damper mechanism 19 is weaker than the spring 36 of the check valve 17 and operates at a pressure lower than the discharge oil pressure from the fixed quantity distributor 13. Therefore, when the filter 18 is clogged and the flow of oil decreases and the oil pressure applied to the damper mechanism 19 increases, the piston 38 and the indicator pin 40 move down to the lower limit position. Become.
[0044]
Normally, the piston 38 of the damper mechanism 19 moves following the fluctuation of the oil amount during the period from the end of the discharge process of the fixed amount distributor 13 to the start of the oil storage operation. Since it is within a limited range, and the protrusion amount of the indicator pin 40 follows this range, it can be confirmed that the filtration filter 18 is functioning normally.
[0045]
On the other hand, when the filtering function is reduced due to clogging of the filter 18, the oil pressure is increased and transmitted to the damper mechanism 19. At this time, since the elasticity of the spring 39 is set lower than the normal supply oil pressure, when the oil pressure acts on the piston 38 as described above, the piston 38 moves to the lower limit position, and the indicator The amount of protrusion of the pin 40 is maximized, whereby it can be confirmed that the filtering function of the filter 18 has deteriorated.
[0046]
As shown in the circuit diagram of FIG. 4, the oil / air mixing mechanism 15 includes an air path branching section 41 for dividing the air from the air main pipe 14 into a high-speed air flow and a low-speed air flow, and an upstream in the low-speed air flow path. A chamber 42 for performing the first mixing of the oil and the low-speed air flow, a flow resistance portion 43 for performing the smoothing of the oil of the oil air, and a low-speed oil air passing through the flow resistance portion 43. An oil / air mixing chamber 44 for mixing a high-speed air flow is formed, and oil air in the oil / air mixing chamber 44 is ejected from a discharge port 45 toward a member to be lubricated.
[0047]
The air discharge port of the air main pipe 14 can be adjusted in air discharge amount by an air flow rate adjusting needle 46.
[0048]
FIG. 3 shows a connection structure between the oil main pipe 47 through which the oil supplied from the lubricating oil supply pump P passes and the fixed amount distributor 13, and the oil passage 26 provided to penetrate the valve block 12 and the oil flow of the fixed amount distributor 13. An oil line filter 49 positioned upstream with respect to the fixed quantity distributor 13 is provided in an oil main pipe 47 which is connected to the inlet 48 by branching and connected to an inlet connection hole of the oil passage 26. A pressure switch 50 is attached to a connection hole on the other end side of the oil passage 26 downstream of the fixed distributor 13 in the oil flow.
[0049]
The oil main pipe 47 connected to the inlet connection hole of the oil passage 26 provided in the valve block 12 is formed inside a joint 51 with a filter. The joint 51 with a filter has an oil line filter 49 attached to the opening at the tip end. A cylindrical shaft 52 is provided, and a holding nut 53 with a male screw is externally fitted to the cylindrical shaft 52 so as to be rotatable and axially movable, and a sleeve-shaped sealing material 54 is removed from the distal end of the cylindrical shaft 52. When the cylinder shaft 52 is inserted into the entry side connection hole and the holding nut 53 is screwed in, the oil line filter 49 attached to the tip of the cylinder shaft 52 first comes into pressure contact with the inner end of the entry side connection hole. The sealing material 54 is pressurized by screwing the holding nut 53, and the fitting portion between the cylindrical shaft 52 and the inlet connection hole is sealed with the deformed sealing material 54. It will connect the oil main pipe 47 to the click 12.
[0050]
As described above, the oil line filter 49 provided in the oil main pipe 47 captures the contaminants in the oil supplied from the lubricating oil supply pump, and the pressure switch 50 switches the oil main pipe 47 from the oil main pipe 47 to the oil passage 26. If the oil supply can be electrically checked, and the oil nut filter 49 of the cylinder shaft 52 is pressed against the inner end of the inlet connection hole, the holding nut 53 is screwed to press the sealing material 54. In addition, it is possible to prevent dust, chips and the like from entering the oil passage 26 during the connection work.
[0051]
The connection of the pressure switch 50 to the oil passage 26 of the valve block 12 has substantially the same structure as the connection of the oil main pipe 47 to the oil passage 26, and the oil passes through the pressure receiving port of the pressure switch 50 inside. It is formed into a tubular shape, and at the time of connection, the tip thereof and the inner end of the connection hole of the valve block 12 are first brought into close contact with each other, and then the sleeve-like sealing material 55 inserted into the outside of the tubular shape is similarly placed outside the tubular shape The sealing material 55 is pressurized by screwing the inserted holding nut 56 into the connection hole, and the fitting portion between the pipe and the connection hole is sealed with the deformed sealing material 55 and, at the same time, dust on the oil passage 26 during the connection work. The pressure switch 50 is connected to the mixing valve 11 while preventing intrusion of chips and the like.
[0052]
The oil-air lubrication system of the present invention is configured as described above, and its operation will be described below.
[0053]
FIG. 1 shows a normal rest state in which pressure oil is not supplied from the oil main pipe 47 to the fixed quantity distributor 13. The fixed quantity distributor 13 is in a rest position in which the piston 21 is raised by pressing the spring 24, and has an umbrella type. The valve 27 is moved upward by compressing the spring 28 to open the upper end of the oil passage 25. The oil storage chamber 22 of the fixed quantity distributor 13, the oil passage 16, and the inlet of the check valve 17. Is filled with oil, the filtration filter 18 is immersed in the oil, the oil storage chamber 22 has a maximum volume and stores the oil therein, and the damper mechanism 19 pushes the piston 38 by the pressure of the spring 39. The volume of the room 37 is in a normal oil storage state, and the amount of protrusion of the indicator pin 40 is small.
[0054]
When the oil pressure in the oil main pipe 47 rises, the fixed amount distributor 13 performs an oil discharging step, and the umbrella valve 27 descends to seal the upper end of the oil passage 25, and at the same time, the umbrella valve 27 is pushed open to open the pressure receiving chamber. When the pressure oil flows into 23 and the piston 21 compresses the spring 24 and descends, the oil pushed out from the oil storage chamber 22 first pushes down the piston 38 of the damper mechanism 19, and the piston 38 goes down, and Oil is stored in 37, and a spring 39 pressing the piston 38 is compressed to store a repulsive force, and the oil is stored by the pressure, and the projection amount of the indicator pin 40 becomes an intermediate state.
[0055]
The discharge of the oil from the fixed amount distributor 13 continues, and the pressure of the oil between the fixed amount distributor 13 and the check valve 17 rises, so that the spring 39 is further compressed and eventually exceeds the relief pressure of the check valve 17, The oil flows out of the oil-air mixing mechanism 15 through the filter 18 and the check valve 17.
[0056]
When the piston 21 in the fixed quantity distributor 13 descends by a predetermined amount and the discharge from the fixed quantity distributor 13 is completed, the piston 38 of the damper mechanism 19 is pushed by the elasticity accumulated by the spring 39 and pushes out the oil. When the elasticity reaches the relief pressure of the check valve 17, the check valve 17 closes, the outflow of oil to the oil-air mixing mechanism 15 stops, and the damper mechanism 19 changes the state of the remaining oil storage and pressure accumulation. Holding the indicator pin 40 reduces the amount of protrusion.
[0057]
Next, when the pressure of the oil main pipe 47 decreases, the fixed quantity distributor 13 enters an oil storage step, the piston 21 returns to the raised position, and pressurizes the oil in the pressure receiving chamber 23, so that the umbrella valve 27 expands in diameter. At the same time as the communication between the oil main pipe 47 and the pressure receiving chamber 23 is cut off, the upper end of the oil passage 25 is moved to a valve-open position where the oil passage 25 is opened, and the oil in the pressure receiving chamber 23 passes through the oil passage 25 into the oil storage chamber 22. By the inflow, the space between the oil storage chamber 22 and the check valve 17 returns to the rest state in which the space is filled with the oil.
[0058]
In the oil storage process of the fixed amount distributor 13, a time difference occurs between the movements of the piston 21 and the umbrella valve 27, so that a negative pressure is generated in the oil existing between the oil storage chamber 22 and the check valve 17. However, the piston 38 of the damper mechanism 19, which pressurizes the oil by the elasticity of the spring 39, moves forward by an amount corresponding to the negative pressure to pressurize the oil, and maintains a positive pressure state. Can be prevented, and when the oil is filled between the oil storage chamber 22 and the check valve 17 with time, the piston 38 of the damper mechanism 19 is moved from the negative pressure as shown in FIG. It will be pushed back by the amount corresponding to the increased oil amount.
[0059]
Further, the check valve 17 is arranged such that the flow of oil flows upward from below, so that air from the oil / air mixing mechanism 15 can be effectively prevented from entering the inside of the check valve 17. However, since the filtration filter 18 is provided upstream of the check valve 17, when dust or chips are mixed in the oil flowing from the fixed amount distributor 13 to the check valve 17, The dirt, chips and the like are trapped by the filtration filter 18, so that the occurrence of sealing failure due to the check valve 17 being caught by the dirt and chips can be prevented. The backflow of air from the mixing mechanism 15 to the fixed quantity distributor 13 can be prevented, the occurrence of poor lubrication due to lack of oil from the fixed quantity distributor 13 can be eliminated, and burning of the lubricated member can be prevented.
[0060]
When the filter 18 is clogged and the oil flow decreases, the oil pressure acting on the piston 38 of the damper mechanism 19 increases, and the indicator pin 40 coupled to the piston 38 projects to the outside with the maximum amount of projection. By observing this visually or using a sensor, the occurrence of clogging of the filtration filter 18 can be confirmed, and the filtration filter 18 may be replaced.
[0061]
In the event that the check valve 17 is damaged and air flows into the fixed quantity distributor 13 from the oil / air mixing mechanism 15 side, the piston 38 of the damper mechanism 19 is pushed to the retreat limit position by the air pressure, The indicator pin 40 has the maximum protrusion amount, and the failure of the check valve 17 can be immediately confirmed. By repairing or replacing the check valve 17, the oil / air mixing mechanism 15 side to the fixed amount distributor 13 Air inflow can be prevented.
[0062]
The oil that has passed through the check valve 17 flows from the oil inlet 48 to the oil / air mixing mechanism 15, and the air supplied from the air main pipe 14 is mixed with the oil in the chamber 42 for the first time. The oil and the low-speed air flow are mixed and further smoothed to some extent by passing through the flow resistance portion 43, and thereafter flow out of the oil / air outlet into the mixing chamber 44 where the high-speed air flows, and are mixed with the high-speed air. By performing the second mixing, the oil air is further smoothed and is ejected from the discharge port 45 and supplied to the lubricated component.
[0063]
【The invention's effect】
As described above, according to the present invention, in the oil-air lubrication system in which the oil air is supplied to the lubricating portion, the filter is provided between the fixed quantity distributor and the check valve in the middle of the oil flow path. Residual dust and chips generated during machining of parts, chips generated from threaded parts during assembling of the mixing valve, dust generated from threads during oil pipe connection, Dirt and chips that are mixed in the oil and flow into the mixing valve from the oil main pipe, and abrasion powder generated by friction of the internal parts due to continuous operation can be captured by the filter, and the check valve seal is defective. Prevents the occurrence of poor lubrication due to lack of oil from the fixed quantity distributor due to the backflow of air. It is possible to prevent a serious accident.
[0064]
Also, an oil line filter is provided in the main oil pipe through which the oil supplied from the lubricating oil supply pump passes, with respect to the oil line filter. Since the pressure switch is provided on the side, the oil line filter catches the mixture of oil supplied from the lubricating oil supply pump, and it is possible to more reliably prevent the occurrence of seal failure of the check valve. The supply of oil from the main oil pipe to the oil passage can be electrically confirmed by the pressure switch.
[Brief description of the drawings]
FIG. 1 is a vertical cross-sectional view of an oil-air lubrication system of the present invention in a state in which a mixing valve is at rest.
FIG. 2 is an enlarged vertical cross-sectional view of the quantitative dispenser according to the first embodiment.
FIG. 3 is a longitudinal sectional view showing a connection structure between an oil main pipe and a fixed quantity distributor in the oil-air lubrication system of the present invention.
FIG. 4 is a circuit diagram showing an oil-air lubrication system of the present invention.
[Explanation of symbols]
11 Mixing valve
12 Valve block
13 Dispenser
14 Air main pipe
15 Oil / air mixing mechanism
16 Oil flow path
17 Check valve
18 Filtration filter
19 Damper mechanism
20 cylinder chamber
21 piston
22 oil storage room
23 Pressure receiving chamber
24 spring
25 Oil passage
26 Oil passage
27 Umbrella type valve
28 spring
29 quantitative nipple
30 Release means spring
31 rooms
32 piston
33 spring
34 pin
35 Operation members
36 spring
37 rooms
38 piston
39 spring
40 Indicator pin
41 Air path branch
42 chambers
43 Distribution resistance
44 Mixing room
45 Discharge port
46 Air flow adjustment needle
47 Oil main pipe
48 Oil inlet
49 Oil line filter
50 pressure switch
51 Joint with filter
52 cylinder shaft
53 Holding nut
54 Sealing material
55 sealing material
56 Holding nut

Claims (3)

An oil / air mixing chamber for mixing oil and air is provided in the middle of the air passage through which air from the compressed air supply source passes. And a check valve to prevent backflow of air to the fixed amount distributor in the middle of the oil flow path connected to the oil / air mixing chamber, and to supply the oil / air generated in the oil / air mixing chamber to the lubrication section An oil-air lubrication system as described above, wherein a filtration filter is provided between the fixed amount distributor and the check valve in the middle of the oil flow path. A damper mechanism is provided between the fixed quantity distributor and the filter in the middle of the oil flow path, and the operating pressure of the damper mechanism is weaker than the valve closing elasticity of the check valve, and the pressure of the discharge oil from the fixed quantity distributor is reduced. 2. The oil-air lubrication system according to claim 1, wherein the oil-air lubrication system is set to operate at a lower pressure than that of the filter, and that clogging generated in the filtration filter can be detected by operation of the damper mechanism. An oil / air mixing chamber for mixing oil and air is provided in the middle of the air passage through which air from the compressed air supply source passes. And a check valve to prevent backflow of air to the fixed amount distributor in the middle of the oil flow path connected to the oil / air mixing chamber, and to supply the oil / air generated in the oil / air mixing chamber to the lubrication section In such an oil-air lubrication system, an oil main pipe through which the oil supplied from the lubricating oil supply pump passes is connected to an oil inlet of the metering distributor, and the oil main pipe is located upstream of the metering distributor. Oil line filter is provided, and a pressure switch is provided for the oil line filter on the downstream side of the oil flow from the fixed amount distributor. Oil-air lubrication system.

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