JPS6118316Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a metering type distribution valve used in an oil supply system that intermittently supplies a fixed amount of lubricating oil to the working parts of a machine tool or the like.

Generally, this type of metering type distribution valve includes a metering chamber formed between a primary port and a secondary port;
It is equipped with a switching valve that selectively communicates the metering chamber with either the primary port or the secondary port depending on the pressure difference between those ports, and the metering chamber is filled with lubricating oil when the oil supply pump is operating. When the pressure is released, the lubricating oil in the metering chamber is transferred to the secondary port. In this way, by repeating the operation and depressurization of the oil supply pump, a certain amount of lubricating oil is intermittently pumped out. At the same time, for example, new branch pipes are installed, or machines are assembled. When performing test runs, etc., it takes a long time to fill the piping from the secondary port to the oil supply point with oil, which is called air bleeding, and also to fill the lubricated surface of the machine tool with oil. There is a drawback that it requires Incidentally, assuming that the amount of oil supplied at one time is 0.03 cc, the oil supply pump must be operated 235.5 times to fill a branch pipe with an inner diameter of 3 mm and a length of 1 m with lubricating oil and completely remove air. .

This idea was made in view of the above circumstances,
The object is to provide a metering type distributing valve which is characterized in that the piping system is quickly filled with oil and air can be easily vented before the start of refueling.

Hereinafter, embodiments of this invention will be described based on the drawings.

Fig. 1 shows an example of a distribution valve of this invention, in which three secondary ports 2 are connected to a primary port 1 connected to a pump A, which is an oil supply means, through a communication passage 3. , oil supply point B of machinery, etc. are shown, but the number of secondary ports 2 can be arbitrarily set regardless of this invention, and will be explained below. This does not affect the gist of the idea in any way. Therefore, the distribution valve according to the present invention will be explained below by showing a part of it in cross section. Inside the distribution valve body 4, there are a primary side port 1 and a secondary side port 2 that communicate with each other orthogonally. In this case, a communication path 3 is formed in communication with the secondary port 2. A truncated-conical umbrella-type switching valve 5 is disposed within the communication passage 3 and has a diameter that becomes smaller toward the primary side. This switching valve 5
is formed of a flexible member such as rubber, and is deformed by the pressure of liquid such as lubricating oil flowing from the primary side port 1 to communicate with the communication path 3 and connect to the secondary side of the switching valve 5. The lubricating oil flows into the cylinder chamber 6, which has a larger diameter than the communication path 3. A metering piston 7 is fitted into the cylinder chamber 6 and is slidable watertightly against the inner wall surface of the cylinder chamber 6, and between the piston 7 and the primary side of the cylinder chamber 6. A measuring chamber 8 is formed. In this case, the piston 7 has a passage 7c that communicates the primary port 1 and the secondary port 2 in the piston body 7b, which is equipped with an O-ring 7a for sliding in the cylinder chamber 6 in a watertight manner. At the same time, a sleeve 7d is formed which is connected to the passage 7c and extends into the primary side, that is, into the communication passage 3, while the switching valve 5
A blocking valve portion 5a protruding into the sleeve 7d is integrally or integrally provided in the sleeve 7d, so that the passage 7c can be selectively blocked by the blocking valve portion 5a.

In addition, the secondary side port 2 has a metering nipple 9.
are screwed together, and a spring 10 serving as an elastic means is compressed between the metering nipple 9 and the piston 7, and the elastic force of the spring 10 constantly pushes the piston 7 toward the primary side. has been done. Note that the metering nipple 9 is provided with a port 9a, and this port 9a substantially forms the secondary port 2.

On the other hand, as shown in FIG. 2, a lubricating oil supply port 11 is located near the secondary port of the cylinder chamber 6.
A branch passage 12 having a diameter is communicated with the branch passage 12, and a check valve 13 is disposed within the branch passage 12. In this case, the branch passage 12 includes a small diameter port 14 bored in the distribution valve body 4 and communicating with the cylinder chamber 6, and a stepped port 16 screwed to a large diameter opening 15 connected to the port 14. The check valve 13 also has a flange portion 13a in its intermediate portion, and is compressed between the flange portion 13a and the spring receiver 18 on the small diameter port side. Due to the elastic force of the spring 19, the flange portion 13a is always
comes into contact with the stepped portion 16' of the stepped passage 16, thereby closing the lubricating oil supply port 11.
Note that the lubricating oil supply port 11 is formed at the open end of the joint member 17. Further, a male threaded portion 17a is carved on the outer periphery of the open end of the joint member 17, and a cap 20 is screwed to this male threaded portion 17a. Then, this cap 20 is removed and a lubricating oil filling nozzle C (see FIG. 4), which will be described later, is connected to the male threaded portion 17a of the joint member 17, and lubricating oil is filled into the branch passage 12 from this nozzle C. This causes the check valve 13 to close to the spring 1.
9 to the right in the figure and comes into contact with the small diameter port 14, but at this time, since the slot 21 is formed around the small diameter port 14,
The lubricating oil from the nozzle flows into the cylinder chamber 6 around the flange portion 13a of the check valve 13, through the slots 21... and the small diameter port 14, and further,
The fuel flows from the distribution valve toward the refueling point B, and air can be quickly vented from the branch pipe.

In addition, 22 is an O-ring interposed at the attachment part of the metering nipple 9, and 23 is a packing interposed at the attachment part of the joint member 17.

In the distribution valve of this invention configured as described above, the lubricating oil pumped by the pump A flows from the primary side port 1 into the communication path 3, and the flexible switching valve is controlled by the liquid pressure. By pressing and deforming the sleeve 7d, lubricating oil flows into the metering chamber 8 through the outside of the sleeve 7d. At this time, a predetermined amount of lubricating oil flows into the measuring chamber 8, so that the piston 7
0 and moves upward in the figure and comes into contact with the metering nipple 9. In this way, after a certain amount of lubricating oil has been measured in the measuring chamber 8, when the pressure on the primary side is released, the piston 7 is pressed downward by the elastic force of the spring 10, and this As a result, the lubricating oil in the metering chamber 8 passes through the passage 7c of the piston 7 and accumulates in the cylinder chamber 6, and after a certain amount of lubricating oil moves into the cylinder chamber 6, the closing valve part of the switching valve 5 5a closes the passage 7c,
When the same operation as described above is repeated, the lubricating oil in the cylinder chamber 6 is supplied to the predetermined oil supply point B through the secondary port 2. By the way, when this distribution valve is newly installed and piping is connected between pump A and oil supply point B, it is necessary to initially fill the piping system with oil and bleed air. Therefore, in this invention, from the joint member 17 to the cap 2.
0, connect the lubricating oil supply nozzle C to the joint member 17, and connect the branch passage 1 from the nozzle C.
By filling lubricating oil into the tank 2, the lubricating oil pushes open the check valve 13 and flows into the cylinder chamber 6, and further flows continuously to the refueling point B through the secondary port 2. This allows the air in the branch pipe to be removed quickly.

Figure 3 shows another embodiment of this invention.
This is a modification example in which the shapes of the switching valve 5 and the piston 7 are changed. That is, the piston 7' includes a piston body 7b' having a hole 7a' for slidably fitting into the outer peripheral surface of a sleeve pin 24, which will be described later, and a lip packing fixed to the primary side of the piston body 7b'. 7c. Moreover, the sleeve pin 24 disposed in the center of the cylinder chamber 6 is
It has a passage 24a that communicates the primary port 1 and the secondary port 2, and a through hole 24b that communicates the passage 24a and the cylinder chamber 6, and a small diameter 24c is formed at the primary end. Become. The sleeve pin 24 is held by a guide 26 that engages with the communicating path 3 and the stepped portion of the cylinder chamber 6, and a metering nipple 9 that is threadedly connected to the secondary port 2. Note that the guide 26 is provided with a passage 26a that communicates the primary side and the measuring chamber 8.

Note that the configuration other than the above is the same as that of the previous embodiment, so the same parts are given the same reference numerals and the explanation thereof will be omitted.

FIG. 4 shows still another embodiment of the distribution valve of this invention, in which a branch passage 12 having a check valve 13 is connected near the secondary port in the piping 27 that connects the secondary port 2. In the case of communication,
This is a case where the structure is further simplified compared to both of the above embodiments. That is, a joint member 17' in which a communication passage 3' and a branch passage 12 are formed into a substantially T-shape is disposed in the middle of the piping 27, and a nozzle is connected to the lubricating oil supply port 11 of the joint member 17' in the same manner as described above. This is a case where the air inside the pipe is vented by connecting C.

It should be noted that the structure other than the above is the same as in both of the above embodiments, so the same parts are given the same reference numerals and the explanation thereof will be omitted. Furthermore, the invention also includes a modified embodiment shown in FIG. In this modified embodiment, the structures of the umbrella-type switching valve 5, piston 7, etc. are the same as those of the first embodiment shown in FIGS. A branch passage 30 is provided between the primary port 1 and a lubricating oil supply port 11 bored in the side wall of the cylinder 6. in this case,
A cylinder chamber 31 with an enlarged diameter is communicated with a portion of the branch passage 30 closer to the lubricating oil supply port 11, and a check valve 32 for selectively opening and closing the lubricating oil supply port 11 is provided in the cylinder chamber 31. is provided. In other words, the check valve 32 includes a piston portion 33 that is tightly fitted into the cylinder chamber 31 and a stem portion 3 that stands coaxially above the piston portion 33.
4, and is mounted in the cylinder chamber 31 via a holding sleeve 35 as shown in the figure. A communication hole 36 communicating with the lubricating oil supply port 11 is bored in the holding sleeve 35, and a lubricating oil guide of a predetermined length extending in the axial direction is correspondingly provided on the peripheral wall surface of the stem portion 34. A groove 37 is formed. Further, a packing 38 is attached to the upper part of the piston portion 33 to seal the lower end opening of the holding sleeve 35. According to this configuration, during intermittent refueling operation in which operation and depressurization of the refueling pump are repeated, the piston portion 33 is held in a state where it is pushed upward in the figure by the hydraulic pressure supplied via the branch passage 30. As the packing 38 is seated at the lower end opening of the holding sleeve 35, the lubricating oil supply port 11 is closed. Note that even if back pressure is generated within the cylinder chamber 6, the piston portion 33 will not be moved inadvertently due to the difference in diameter between the cylinder chamber 31 and the lubricating oil supply port 11. On the other hand, for example, in order to newly connect a branch pipe to the port 9a of the metering nipple 9 and vent the air, the piston part 33 is pushed down via the stem part 34 and the packing 38 is attached to the holding sleeve 35. The lubricating oil guide groove 37 is moved away from the lower end opening, and the lubricating oil guide groove 37 is moved into the cylinder chamber 3.
The oil supply pump can be operated continuously while facing the inside of the tank. That is, in this state, the lubricating oil supplied from the primary port 1 flows through the branch passage 3.
0, enters the cylinder chamber 31 through the lubricating oil guide groove 37, the communication hole 36, and the lubricating oil supply port 11, and is directly forced into the cylinder chamber 6, and the newly connected branch from the port 9a. It will flow continuously into the pipe. In addition, as illustrated in FIG. 6, an on-off valve 42 attached to the lower end of the bolt 41 is disposed between the branch passage 30 and the lubricating oil supply port 11,
By operating the bolt 41, the branch passage 30
The gap between the lubricating oil supply port 11 and the lubricating oil supply port 11 may be opened and closed.

As explained above, according to the distribution valve of this invention, by filling the branch passage communicating with the vicinity of the secondary port with lubricating oil, it is possible to instantly fill the piping with oil, allowing air purge operation. can be done easily and quickly. Therefore, when installing a new branch pipe or when starting a test run of a machine, pumps, etc. must be operated intermittently for a long period of time when filling the branch pipe with oil and venting air. There is no need for this, and excellent effects such as shortening the time from machine assembly to test operation and reducing power consumption can be achieved, and the value of its use is remarkable.

[Brief explanation of the drawing]

Figure 1 is a partially sectional side view showing an example of the distribution valve of this invention, Figure 2 is a sectional view taken along the - line in Figure 1, and Figures 3 and 4 are different versions of the distribution valve of this invention. FIG. 5 is a sectional view of a modified embodiment of the distribution valve shown in FIGS. 1 and 2, and FIG. 6 is a sectional view showing the modified embodiment of FIG. 5. FIG. 7 is a cross-sectional view illustrating another check valve that can be obtained. In the figure, 1 is the primary side port, 2 is the secondary side port,
3 is a communication passage, 4 is a distribution valve main body, 5 is a switching valve, 6 is a cylinder chamber, 7 is a piston, 8 is a measuring chamber, 10 is a spring (elastic means), 11 is a lubricating oil supply port, 12 is a branch passage , 13 is a check valve, and 19 is a spring.

Claims (1)

[Claims for Utility Model Registration] A primary port connected to a fuel pump including a pressure relief valve, a secondary port connected to the primary port via a communication passage, and a secondary port connected to the communication passage. a cylinder chamber; a piston that is slidably provided in the cylinder chamber and forms a lubricating oil measuring chamber of a predetermined volume between the piston and the communication passage; a first operating state in which the primary side port and the metering chamber communicate with each other depending on a pressure difference between the elastic means biased toward the side and the primary side port within the communication path; or the metering chamber; a second chamber communicating with the secondary side port;
an umbrella-type switching valve that selectively operates when the oil supply pump is in operation, and when the oil supply pump is in operation, the switching valve is in the first operating state, and lubricating oil from the primary port moves the piston. When the measuring chamber is filled with lubricating oil and the pressure is released, the switching valve is in the second operating state, and the lubricating oil in the measuring chamber is transferred to the secondary port by the urging force of the resilient means. In the metering type distribution valve, a branch passage having a lubricating oil supply port is communicated in the cylinder chamber or near the secondary port connected to the cylinder chamber, and a reverse passageway in which the lubricating oil supply port is normally closed in the branch passage is provided. A stop valve is provided so that lubricating oil can be forcibly and continuously injected into the cylinder chamber or the branch pipe connected to the secondary port through the check valve. Metering type distribution valve.