JPS602560B2 - Pneumatic circuit lubrication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides oil (lubricating oil) mixed into a pneumatic circuit that supplies pressurized air as a power source for operating pneumatic equipment such as air cylinders in order to operate said pneumatic equipment.
This invention relates to an oil recovery and supply device, that is, a lubrication device, for recovering oil and circulating it back into a pneumatic circuit.

Generally, oil is mixed into the air circuit by a lubricator (lubricating oil supply device), but most of it is released into the atmosphere when the compressed air is exhausted, resulting in the problem of contaminating the surrounding environment. There is also the problem of waste.

Furthermore, since only a very small amount of oil is required to protect the pneumatic equipment, it is difficult to adjust and maintain the amount of oil mixed in to prevent contamination and waste of the surrounding environment. The present invention was made in view of the above points, and its purpose is to filter, separate and recover oil in compressed air discharged from pneumatic equipment, and to be able to circulate the recovered oil back into the pneumatic circuit, and to provide a switching valve. An object of the present invention is to provide a lubricating device for a pneumatic circuit that can eliminate noise during exhaust.

An oil recovery device that has a filter that separates and recovers oil from air containing oil and a container that stores the oil separated and recovered from the outside of the filter, and when a pressure signal is applied to the oil recovery device that is connected to the container of the oil recovery device. The pump includes an operating pump and a lubricator provided in a pneumatic circuit, the pump comprising an oil metering chamber connected to the container, an oil discharge port communicating with the oil metering chamber and connected to the lubricator, and a piston chamber. a body formed with a piston, a piston movably disposed within the piston chamber and operated by the pressure signal, and a piston rod attached to the piston and having one end extending into the oil metering chamber; A check valve is provided in a passage connecting the oil measuring chamber to the outside of the lubricator to allow oil to flow from the container to the oil measuring chamber. It is equipped with a check valve that allows fluid to flow only in the

An embodiment of a pneumatic circuit lubricating device according to the present invention will be described below with reference to the drawings.

In FIG. 1, a lubricating device 1 according to the present embodiment is shown, which includes an oil recovery device 10 and a pump 20.

The oil recovery device 1 has a cover ring 11, a stem 15 which is screwed downward into the center of the cover ring 11, and an adapter 13 which is screwed and connected to the lower end of the stem to connect the cover ring downward. A bowl-shaped container arranged and fixed at the center of the oil recovery device 10 between the support plate 14 and the cover ring 11 arranged on the upper part of the adapter 13. an inner filter 16 for collecting oil; and an inner filter 16 for collecting oil.
an outer filter 17 for collecting oil which is fitted on the outside of the cover ring 11 and sandwiched between the cover ring 11 and the support plate 14; and an exhaust gas formed so as to be able to communicate from one side of the cover ring 11 to the inside of the inner filter 16. a through hole in which a part formed radially in the lower part of the adapter 3 and a part opened in the axial direction downward from the part are combined and have an outlet 19' in the dust part of the container 12; It has 19.

In this oil recovery device, when air containing oil is introduced into the inlet 18, the oil in the air is filtered and separated by the inner filter 16 while the air passes through the inner filter, and further condensed by the outer filter 17. It is stored in 12.

The recovered oil 0 stored in the container 12 of the oil recovery device 10 passes through a through hole 19 formed in the adapter 13 to the outlet 1.
9', and the purified air is discharged from around the outer filter 17 into the outside air. Pump 2 includes a body 21, a cover ring 22 attached to the body 21, a piston chamber 23 formed on one end side of the body 21, and the body 21.
an oil metering chamber 25 formed between the piston chamber 23 and the oil discharge port 24; and an oil metering chamber 25 formed in the cover ring 22 and communicating with the piston chamber 23. a piston 27 inserted into the piston chamber 23 and having a piston rod 28; and a piston 27 inserted into the piston chamber 23 and having a piston rod 28;
A screw type oil discharge valve or check valve 32 is screwed into the body 21 and a valve chamber 36 is formed in the body 21 and communicated with the oil metering chamber 25. A pressure signal such as compressed air is input to the pressure signal port 26 and introduced into the piston chamber 23. The piston 27 is operated by a pressure signal to move toward the forward side for pushing out oil, and is urged to move toward the return side by a compression spring 29.

One end of the piston group 28 is inserted into the oil metering chamber 25 so that the oil in the oil metering chamber 25 can be pushed out toward the oil discharge port 24 when the piston 27 moves toward the forward side. Further, the other end of the piston run 28 is configured so that it can hit a stroke adjustment screw 31 threaded into the piston cover 30 when the piston 27 is moved to the return side.
By changing the position of the piston 27, the return side stopping position of the piston 27 is changed, and the volume of the oil measuring chamber 25 can be changed. The oil discharge port 32 has a through hole 33 which is a combination of a part formed to the middle of one end on the oil measuring chamber side and a part opened in the radial direction from the part, and a through hole 33 that is opened in the radial direction It has an O-ring 34 surrounding the part that opens and closes the through hole 33, and when the oil measured in the oil measuring chamber 25 is pushed out by the piston rod 28, the O-ring 34 opens and the oil flows out. It is a normally open valve that allows oil in the metering chamber 25 to pass through and closes when the ○ ring 34 contracts when the piston rod 28 moves to the return side.

The oil outlet 24 is connected to a supplied part such as a pneumatic circuit. In this embodiment, the check valve 35 has two pumps built in, and includes a valve chamber 36 formed in the body 21 of the pump 20, a valve seat 37 interposed in the valve chamber 36, a pole 38, and a cover. It has a through hole 39 formed in the ring 22 and connected to the valve seat 36, and a through hole 40 communicating from the valve seat 36 to the oil metering chamber 25. The through hole 39 of the check valve 35 is connected to the container 1 of the oil recovery device 10 via the nipple 43.
When the oil measured in the oil measuring chamber 25 of the pump 20 is pushed out by the piston shaft 28,
When the ball 38 is brought into close contact with the valve seat 37 due to the pressure in the oil measuring chamber 25, the oil in the oil measuring chamber 25 is discharged, and the piston rod 28 is moved to the return side, the ball 38 falls under its own weight. When the check valve 35 is opened, the recovered oil 0 in the container 12 of the oil recovery device 10 flows into the check valve 3.
The oil flows into the oil measuring chamber 25 through the through hole 39 of No. 5, the valve chamber 36, and the through hole 40. In the above configuration, exhaust gas containing oil is introduced into the oil recovery device 10 from the inlet 18, the oil is recovered by the oil recovery device, and the recovered oil can be pumped and reused.

This lubricating device 1 can be used, for example, by being connected to a pneumatic circuit in the manner shown in FIG.

In FIG. 2, 5 is an air pressure source, 6 is a switching valve connected to the air pressure source 5' through a conduit 7a, 8 is a lubricator provided in the middle of the conduit 7a, and 9 is a switching valve connected through conduits 7b and 7c. 6 is a pneumatically actuated device or cylinder connected to the cylinder. Therefore, the inlet 18 of the oil recovery device 10 is connected to the conduit 7.
The oil discharge port 24 of the pump is connected to the lubricator 8 via a conduit 7c, and the pressure signal port 26 is connected to the conduit 7 via a conduit 7f.
Connect to b. In this usage example, when the switching valve 6 is set to the state shown in FIG. 2, no pressure signal from compressed air is applied to the pressure signal port 26 of the pump 20, so the piston 27 is moved to the return side. check valve 3
5 is open.

Therefore, the recovered oil 0 stored in the container 12 of the oil recovery device 10 flows through the nipple 43 and the check valve 35 to the oil measuring chamber 25 of the pump 20.
A certain amount can be stored within. Then, when the switching valve 6 is switched from the state shown in FIG.
A part of the compressed air supplied to the pipe is branched into a conduit 7f.

The branched compressed air is input as a pressure signal to the pressure signal port 26 of the pump 20, and this pressure signal pushes the piston 27 of the pump 20 to the forward side, and the piston rod 2
At step 8, the oil in the oil measuring chamber 25 is pushed out, and the pushed out oil flows from the oil outlet 32 to the oil outlet 24.
and is sent to the container of the lubricator 8 through the conduit 7c. When the switching valve 6 is switched again to the state shown in FIG. 2, the piston 27 and piston rod 28 of the pump 10 are moved to the return side by the elastic force of the compression spring 29, and the oil discharge port 32 is closed. The check valve 35 is opened, and the recovered oil 0 stored in the container 12 of the oil recovery device 10 is supplied to the oil measuring chamber 25 of the pump 20.
By repeating the above-described operation, recovered oil 0 is pumped into the container of the lubricator 8.

When using this lubricating device for the first time, it is sufficient to fill the container with a predetermined amount of oil in advance.

As is clear from the above explanation, the lubricating device according to the present invention can reuse the lubricating fluid that lubricates pneumatic equipment such as switching valves and cylinders semi-permanently, thereby reducing the consumption of the lubricating fluid and making it economical. Yes, 'o- Since the lubricating fluid in the exhaust gas can be recovered, the problem of environmental pollution is eliminated.

1. Exhaust noise can be reduced by using a filter, and the exhaust noise when operating the switching valve can be eliminated, and other effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a lubricating device for a pneumatic circuit according to the present invention;
FIG. 2 is a diagram showing an example of use of the lubricating device of the present invention. 1... Lubrication device, 10... Oil recovery device, 11...
・Covering, 12... Container, 16... Inner filter,
17... Outer filter, 18... Inlet, 20... Pump, 2
3... Piston chamber, 24... Oil discharge port, 25... Oil measuring chamber, 26... Pressure signal port, 27... Piston, 2
8...Piston rod, 32...Discharge valve, 35...Check valve. Murasaki No Juku Figure 2

Claims (1)

[Claims] 1. An oil recovery device having a container for storing oil separated and recovered by a filter that separates and recovers oil from air containing oil, and a pump that is connected to the container of the oil recovery device and operates when a pressure signal is applied. and a lubricator provided in the pneumatic circuit, the pump having an oil measuring chamber connected to the container, an oil discharge port communicating with the oil measuring chamber and connected to the lubricator, and a piston chamber. a body, a piston movably disposed within the piston chamber and actuated by the pressure signal, and a piston rod attached to the piston and having one end extending into the oil metering chamber; A check valve that allows oil to flow only from the oil measuring chamber to the lubricator is provided in a passage connecting the lubricator, and a check valve is provided in a passage connecting the inside of the container and the oil measuring chamber from the container to the oil measuring chamber. A lubricating device for a pneumatic circuit, characterized by being equipped with a check valve that only allows fluid to flow.