JPS5823507B2 - Pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an auxiliary pump for a lubricant supply device that supplies lubricant to lubricated parts such as bearings of various machines.

Generally, this type of lubricant supply device uses a distribution valve so that it can simultaneously supply lubricant to a large number of undulating parts, and in particular, only one pipe is required and the structure of the distribution valve is relatively small. Because of its simplicity, a lubricant supply device has been proposed that uses a single-pipe end-type circuit and parallel-operating distribution valves (Utility Application No. 136-212-1981).

Greasing using this device operates a distribution valve by applying pressure to the pipe line and releasing pressure, and supplies a certain amount of lubricant to the lubricated part. In the distribution valve used in this system, the metering piston that separates the pipe inlet from the metering chamber is provided with a passage for filling the metering chamber with lubricant. Without the piston operating, the lubricant at the inlet of the pipe is supplied to the lubricated part through the passage and the measuring chamber without being metered.

Therefore, due to the configuration of the distribution valve as described above, in order to operate the pump, it is necessary to supply a large amount of lubricant in a short period of time to increase the pressure in the pipe line.There is no problem with the above-mentioned lubricant supply device in which the pump is driven by a prime mover, but There are problems with manual pumps that replace prime movers.

In other words, in the case of a pump for a supply device such as the one described above that supplies oil via a distribution valve, and a manual pump in which a pressurizing piston is reciprocated by a bundle or the like, the oil is pressurized and drained in the forward process, and released in the return process. It is designed to absorb oil, but the above pressure varies depending on the force and speed of the bundle operation, so if the bundle operation is performed slowly, the pressure will also be applied slowly. Slowing the operating speed of the operating bundle of a manual pump means that the flow rate will be lower and the pressure will not rise enough to overcome the sliding resistance of the metering piston in the distribution valve.The lubricant will bypass the distribution valve. Therefore, as mentioned above, there is a drawback that the distribution valve continues to be supplied with lubricant without being metered (Utility Model Publication No. 48-13678).

Therefore, with conventional manual pumps, they must be operated quickly and require skill to operate.
There was an inconvenience that it could not be used by any number of people.

Therefore, the present invention was devised in view of the above-mentioned drawbacks.
To provide a manual pump which allows any person to drain oil from the pump in a short time and in large quantities and to accurately supply oil from a distribution valve regardless of how a bundle is operated.

That is, in the present invention, the lubricant is pressurized and accumulated in the plunger chamber each time the operating bundle is operated, and the lubricant is discharged in a pulsatile manner using this accumulated pressure, thereby gently operating the temporary bundle. Also, the discharge pressure for each operation of the bundle is kept constant,
The present invention is designed to operate the distribution valve accurately, and embodiments of the present invention will be described below with reference to the drawings.

In the embodiment of the manual pump shown in Fig. 1, the upper half is the tank 1.
, the lower half is made up of block 2.

As shown three-dimensionally in FIG. 2, the block 2 has a stepped through hole 10 extending vertically through its center, and a pressure accumulating piston 4 is placed in a small diameter chamber at the top, and a large diameter chamber at the bottom. A pressurizing piston 5 is provided, a plunger chamber 3 is formed between these pistons 4 and 5, and the plunger chamber 3 is
A spring 6 for reciprocating motion is provided.

The pressure accumulating piston 4 has a narrow passage 7 formed at the top and bottom, and a plug 9 is provided at the upper end of the passage 7 via a ball-shaped shutoff valve 8.

The passage 7 is for completely removing the air from the plunger chamber 3 when the manual pump of the present invention is used for the first time, and is always closed and shut off by a shutoff valve 8 during normal use. be.

Further, the lower end of the pressure piston 5 is in contact with one end of a levered operation bundle H which is pivotally connected to the block 2 via a pin 11.

The block 2 is formed with three ports 13, 14, and 15 communicating with the suction/exhaust port 12 of the plunger chamber 3.

One suction port 13 opens into the tank 1, and the other two suction ports 14 and discharge port 15 open outside the tank.

Both of the binocular entrances 13 and 14 have screw grooves 1 on the opening edges.
6 (see FIG. 2), and a large number of grooves 19 are formed in the tapered portion 18 at the connection portion with the communication path 17.

Of the binocular inlets 13 and 14, the inlet 13 that communicates with the tank 1 is provided with a spherical inlet valve 20 inside and a valve seat 21 with a tube facing down at the rim of the mouth, and the other inlet 14 is plugged. It has been closed down by 22.

The suction/discharge port 12 is opened at a position where it is not blocked by the upper end of the pressurizing piston 5 when the pressurizing piston 5 is positioned at the lower limit, while a discharge hole is provided in the side surface of the pressurizing piston 5, which is hollow inside. 23 is formed.

The discharge hole 23 is formed at the stroke end of the pressure piston 5, that is, at a position where it communicates with the suction/discharge port 12 when the pressure piston 5 contacts the stopper 3a.

Inside the tank 1, a pair of spring seats 24 and 25 are provided at the upper part of the block 2.

The internal spring seat 24 covers the upper end of the pressure accumulating piston 4, and the external spring seat 25 has its lower edge fixed to the block 2 via a screw 26 to cover the internal spring seat 24. A spring 27 for pressure setting is provided between the
The pressure accumulating piston 4 is constantly pressed toward the pressurizing piston 5 side.

Further, an inlet 28 formed on the upper surface of the tank 1 is provided with a cup-open filter 29 and a lid 30, so that the lubricant A is supplied into the tank 1 from the inlet 28 through the filter 29.

The present invention is constructed as described above, and its operation will be explained below.

When the operating force on the bundle H is released, the pressure accumulating piston 4 is located at the upper spring 27, and the pressure piston 5 is located at the lower stroke limit region due to the internal spring 6.

If the bundle H is swung about the pin 11 from this state, the following suction and discharge action can be performed.

That is, when the bundle H is actuated clockwise and the pressurizing piston 5 is moved upward by its lever action, the suction/discharge port 12 is first closed and the lubricant is sealed in the plunger chamber 3 at the beginning of the movement.

Therefore, as the pressure piston 5 moves upward, the pressure accumulating piston 4 moves upward against the pressure setting spring 27.
The pressure of the lubricant sealed in the plunger chamber 3 is increased in proportion to the change in the load of the spring 27.

The amount of compression of the spring 27 corresponds to the stroke amount t of the pressure piston 5 shown in FIG. 2, and the greater the stroke amount of the pressure piston 5, the greater the accumulated force of the lubricant can be obtained.

Therefore, when the pressurizing piston 5 reaches the stroke end and the plunger chamber 3 and the suction/discharge port 12 communicate with each other via the discharge hole 23, the repulsive force of the spring 27 pushes down the spring seat 24 and the pressure accumulating piston 4, and the plunger chamber The lubricant in 3 can be discharged to a distribution valve connected to the discharge port 15.

In this case, the suction valve 20 is moved to the valve seat 2 due to the pressure difference before and after it.
1, and the lubricant corresponding to the volume reduced by the downward movement of the pressure accumulating piston 4 is completely discharged.

When the bundle H is rotated counterclockwise from the above state to release the operating force on the pressure piston 5, the pressure piston 5 begins to move downward due to the stress of the spring 6 for backward movement.

At the beginning of the movement, the communication between the discharge hole 23 and the suction/discharge port 12 is cut off, and the inside of the plunger chamber 3 becomes vacuum.
5 is released into the plunger chamber 3 due to a sudden drop in pressure.

On the other hand, the suction valve 20 of the suction port 13 is opened by the differential pressure, and as a result, the amount of pressure drop at the discharge port 15 is returned to the plunger chamber 3, but only the amount discharged from the distribution valve is returned to the plunger chamber 3.
Since the amount of oil in the tank 1 is insufficient, the lubricant A in the tank 1 is rapidly sucked into the plunger chamber 3.

If the discharge port 15 is piped to a high position and the oil head causes a backflow, the suction valve 20 will be moved to the valve seat 21.
to prevent it from escaping into the tank.

In the illustrated embodiment, the lubricant is supplied from the tank 1 provided in the pump, but the suction port 13 at the top
A suction valve 20 and a valve seat 21 are provided at the lower suction port 14,
By applying the plug 22 of the lower inlet 14 to the upper inlet 13, it is possible to supply lubricant via piping from a completely separate tank.

As described above, the present invention includes the pressurizing piston 5 and the accumulating piston 4 inserted into the through hole 10 of the block 2 so as to freely reciprocate, and the plunger chamber 3 being formed between the two pistons 4 and 5. An elastic member 27 opposing the elastic member 6G installed in the plunger chamber 3 is installed on the back side of the pressure accumulating piston 4 to press the accumulating piston 4 toward the pressurizing piston 5, while pushing the accumulating piston 4 toward the pressurizing piston 5. A suction port 13 and a discharge port 15 formed in the block 2 at a position at or near the return end
A suction/discharge port 12 is formed in the block 2 to communicate between the plunger chamber 3 and the plunger chamber 3.
While sealing the plunger chamber 3 and the suction/discharge port 12 at or near the forward end of the pressurizing piston 5,
A suction valve 20 is formed in the pressurizing piston 5 to prevent backflow to the tank 1 when lubricant is supplied to the distribution valve connected to the discharge port 15. Since it is provided at the suction port 13, the accumulated lubricant pressure for each operation of the bundle H, that is, the one-time discharge pressure, is
It is always constant regardless of the magnitude of the operation speed of the bundle H.

Therefore, whether the bundle H is operated quickly or slowly, the intermittent discharge pressure of the lubricant, that is, the pulse pressure, remains as set.
The distribution valve for the lubricant supply device operates at a defined speed, which has the advantage of providing accurate lubricant metering.

Furthermore, by providing a suction valve 20 at the suction port 13, the discharge port 15 and the suction port 13 are cut off, so that when the pump is stopped, the lubricant at the discharge port 15 flows back to the suction port 13 due to reverse pressure such as a head difference. There's nothing to do.

Furthermore, the suction port 13 and the discharge port 15 are combined into one suction and discharge port 12.
During suction, the suction/discharge port 12 is directly connected to the plunger chamber 3, and during discharge, the suction/discharge port 12 is connected to the plunger chamber 3 through one discharge hole 23 provided in the pressurizing piston 5. There is no need to isolate the outlet 15 from the pressurizing piston 5.

As a result, the suction port 13 and the discharge port 15 are opened to the plunger chamber 3, respectively.
There is no need to consider the placement accuracy of the passages, and therefore the passage configuration is simplified.

As described above, the present invention has the advantage of being able to accurately supply lubricant with a simple passage structure.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the main parts. 1...Tank, 3...Plunger chamber,
4... Pressure accumulating piston, 5... Pressurizing piston, 13... Suction port, 14... Suction port, 15... Discharge port , 20...Suction valve, 23...Discharge hole, 24...Spring seat,
25... Spring seat.

Claims (1)

[Claims] 1 Operation of the bundle H In a manual pump without a discharge valve, which is configured to perform suction and discharge by reciprocating the pressurizing piston 5, the pressurizing piston 5 and the accumulating piston 4 are inserted into the through hole 10 of the block 2. A plunger chamber 3 is formed between the two pistons 4.5 by inserting the pistons 4.5 into each other so that they can freely reciprocate. A suction port 13 is installed on the back side to press the pressure accumulating piston 4 toward the pressure piston 5, and is formed in the block 2 at a position at or near the return end of the pressure piston 5. A suction/discharge port 12 is formed in the block 2 to communicate the discharge port 15 with the plunger chamber 3, and the suction/discharge port 12 is shut off at a predetermined movement position of the pressurizing piston 5 to seal the plunger chamber 3. On the other hand, one discharge hole 23 that communicates the plunger chamber 3 and the suction/discharge port 12 is formed in the pressurizing piston 5 at a position at or near the forwarding end of the pressurizing piston 5, A manual pump for a lubricating device, characterized in that the suction port 13 is provided with a suction valve 20 that prevents backflow to the tank 1 when lubricant is supplied to the distribution valve connected to the discharge port 15.