JP2022046007A - Quantitative distributor - Google Patents

Abstract

To easily change a first-out type quantitative distributor to a later-type quantitative distributor.SOLUTION: A lateral hole 33 communicating an oil storage chamber 112 and an oil guide pipe 30 is closed with, for example, a pipe 23, and at the time of depressurization, a lubricant in a measurement chamber 111 is flowed from the oil guide pipe 30 toward a discharge port 202 of a discharge nipple 20.SELECTED DRAWING: Figure 2

Description

The present invention relates to a quantitative distributor that measures a predetermined amount of lubricant supplied from a lubrication pump and supplies it to a lubricated portion in a lubricant supply system, and more specifically, to a technique for changing a discharge method. be.

For example, in various machine tools such as injection molding machines, it is necessary to supply a predetermined amount of lubricant in a timely manner so that an operating portion such as a bearing portion does not cause seizure or galling. A quantitative distributor is used for this. In the present specification, the lubricant includes a grease having a high viscosity in addition to a lubricating oil called a liquid oil.

The metering dispenser is used by being connected to a refueling pump that alternately repeats refueling and depressurization, and the discharge method includes a first-out method (for example, see FIGS. 9 and 10 of Patent Document 1) and a second-out method. (See, for example, Patent Document 2).

Both the first-out method and the second-out method are equipped with a cylinder as a housing as a basic configuration. One end side of the cylinder is an injection part connected to the primary side pipe from the refueling pump, and a discharge nipple having a discharge part is attached to the other end side of the cylinder. A secondary side pipe leading to the lubricated part is connected to the discharge part.

Normally, the injection part and the discharge part are coaxial, and an oil guide pipe whose inside is a lubricant passage is arranged between these ports in the cylinder. A coil spring is provided in the cylinder to urge the piston and the piston toward the starting end position on the injection portion side. An oil guide pipe is inserted in the center of the piston, and the piston reciprocates along the oil guide pipe between the start position and the end position.

A relay chamber is formed between the injection part and one end side of the oil guide pipe, which has a diameter smaller than the inner diameter of the cylinder and communicates with the inside of the cylinder. An umbrella-shaped valve that switches the flow path according to the pressure is provided.

The umbrella-shaped valve is pushed up by the pressure at the time of refueling of the refueling pump, closes one end side of the oil guide pipe, and the hem (skirt part) is reduced in diameter and separated from the wall surface of the relay chamber. As a result, as the first flow path, the lubricant flows from the injection portion into the cylinder through the relay chamber, and pushes up the piston from the start position to the end position against the urging force of the coil spring.

Then, when the piston reaches the terminal position, a certain amount of the lubricant is measured in the cylinder on the head side of the piston as a measuring chamber.

Next, when the refueling pump is in the depressurized state, the piston is pushed back by the coil spring. As a result, the umbrella-shaped valve separates from one end side of the oil guide pipe and the hem expands in diameter to come into close contact with the wall surface of the relay chamber, so that the first flow path is closed while the lubricant in the measuring chamber enters the oil guide pipe. A second flow path is formed that flows toward it.

In the case of the late-out method, the lubricant flows through the oil guide pipe as it is toward the discharge part, but in the first-out method, the back side of the piston (the side opposite to the head) is used as an oil storage chamber, and the oil storage chamber is used. The oil guide pipe is provided with a horizontal hole for allowing the lubricant to flow into the oil storage chamber.

That is, in the first-out method, when the lubrication pump is depressurized, the lubricant in the measuring chamber passes through the oil guide pipe and flows from the lateral hole into the oil storage chamber, and a certain amount of the lubricant is temporarily stored in the oil storage chamber.

Then, at the time of refueling from the next refueling pump, the umbrella type valve is pushed up and one end side of the oil guide pipe is closed, the hem portion thereof is reduced in diameter to form the first flow path, and the piston is lifted to depressurize. Occasionally, a third flow path is formed in which the lubricant stored in the oil storage chamber flows from the lateral hole into the oil guide pipe and is discharged from the discharge portion to the secondary side pipe.

That is, in the case of the later-out method, the lubricant is discharged by the urging force of the coil spring in the cylinder when the lubrication pump is depressurized, resulting in low-pressure discharge. Since the lubricant is discharged by the lubrication pressure of, high pressure is discharged.

Whether to use low-pressure discharge or high-pressure discharge is selected according to the situation of the lubricated part, etc., but the manufacturer side uses a late-out type quantitative distributor and first-out so that the user's order can be met in a timely manner. It is necessary to stock a considerable number of both models of the fixed-quantity distributor of the method. However, this has a problem that inventory management is difficult. Therefore, it is preferable that the model can be easily changed.

Japanese Unexamined Patent Publication No. 2000-199598 (see FIGS. 9 and 10) Jitsufuku No. 03-20640

Therefore, an object of the present invention is to make it possible to easily change the first-out type quantitative distributor to the latter-type quantitative distributor.

In order to solve the above problems, in the present invention, the injection part to which the lubricant is supplied from the primary side pipe of the refueling pump which repeats refueling and depressurization alternately and the secondary side pipe to the refueled part are connected to each other. A cylinder having a portion, an oil guide pipe whose inside is a lubricant passage and is arranged between the injection portion and the discharge portion, and an oil guide pipe inserted in the center portion to start the injection portion side in the cylinder. A piston that reciprocates between the position and the end position closer to the discharge portion side, a spring means that urges the piston from its back side toward the start end position, and one end side of the injection portion and the oil guide pipe. The flow path is switched between a relay chamber having a diameter smaller than the inner diameter of the cylinder formed between the cylinders and communicating with the cylinder, and a flow path arranged in the relay chamber according to the pressure at the time of refueling and the pressure at the time of depressurization of the refueling pump. It is equipped with an umbrella-shaped valve, and the inside of the cylinder is partitioned by the piston into a measuring chamber on the head side and an oil storage chamber on the back side, and a lateral hole communicating with the oil storage chamber is formed in the oil guide pipe. And
At the time of refueling from the refueling pump, the lubricant flows from the injection portion to the measuring chamber through the relay chamber in a state where one end side of the oil guide pipe is blocked by the umbrella type valve, and the piston is the starting end. A first flow path is formed, which is pushed up from the position toward the terminal position against the urging force of the spring means.
When the lubrication pump is depressurized, the umbrella-shaped valve closes the first flow path, one end side of the oil guide pipe is opened, and the spring means pushes the piston back toward the starting position, and the measuring chamber is used. A second flow path is formed in which the lubricant of the above flows to the oil storage chamber through the oil guide pipe and the lateral hole.
At the time of refueling from the next refueling pump, the first flow path is formed, and at the time of depressurization, the lubricant stored in the refueling chamber flows from the lateral hole into the oil guide pipe and the discharge portion. In the first-out method quantitative distributor, the discharge method in which the third flow path is formed to be discharged from the secondary side pipe is
The side hole is closed to shut off the oil storage chamber and the oil guide pipe, and when the lubrication pump is depressurized, the lubricant in the measuring chamber is flowed from the oil guide pipe toward the discharge portion to perform a discharge method. It is characterized by being provided with a discharge method changing means for changing to a dispensing method.

The present invention includes an embodiment in which, as the discharge method changing means, a closing pipe that is fitted from the discharge portion to a position that closes the lateral hole in the oil guide pipe is used.

The closing pipe is preferably a metal pipe having a predetermined axial length, but one end of the discharge tube connected to the discharge portion may be used as the sealing pipe.

The cylinder has the discharge portion on the discharge side and has a discharge nipple that supports the other end of the oil guide pipe, and the discharge nipple is formed with a sleeve that surrounds the lateral hole of the oil guide pipe with a predetermined gap. When the second flow path is formed, the side hole passes through the sleeve to reach the oil storage chamber, and when the third flow path is formed, the oil storage chamber is discharged from the oil storage chamber through the sleeve and the side hole. In an embodiment including a flow path in the sleeve leading to the portion, an O-ring that closes the flow path in the sleeve at a position below the lateral hole can be used as the discharge method changing means.

According to the present invention, the first-out type quantitative distributor can be easily changed to the latter-type quantitative distributor.

A cross-sectional view showing (a) an operation at the time of refueling and (b) a cross-sectional view showing an operation at the time of depressurization of the quantitative distributor according to the first-out method as the basic embodiment of the present invention. The cross-sectional view showing (a) the operation at the time of refueling and (b) the operation at the time of depressurization of the quantitative distributor according to the first embodiment of the present invention in which the first-out type quantitative distributor of FIG. Sectional drawing which shows. The cross-sectional view showing (a) the operation at the time of refueling and (b) the operation at the time of depressurization of the quantitative distributor according to the second embodiment of the present invention in which the first-out type quantitative distributor of FIG. Sectional drawing which shows. (A) A cross-sectional view at the time of depressurization operation showing another example of the quantitative distributor according to the first-out method as the basic embodiment of the present invention, and (b) the first-out method quantitative distributor according to another example of (a). The cross-sectional view at the time of the decompression operation which shows the quantitative distributor which concerns on the 3rd Embodiment of this invention which changed to the post-delivery method.

Next, some embodiments of the present invention will be described with reference to FIGS. 1 to 4, but the present invention is not limited thereto.

First, the quantitative distributor 1A according to the advance method as the basic form (precursor form) of the present invention will be described with reference to FIGS. 1 (a) and 1 (b). The present invention changes the quantitative distributor 1A according to the first-out method to the second-out method.

The quantitative distributor 1A according to this first-out method includes a cylinder 10 as a housing. An injection portion 101 is formed on one end side (lower end side in FIG. 1) of the cylinder 10, and a discharge portion 102 is formed on the other end side (upper end side in FIG. 1) of the cylinder 10. The injection unit 101 and the discharge unit 102 are arranged coaxially.

Lubricant is supplied to the injection unit 101 from a primary side pipe of a lubrication pump (not shown) that alternately repeats lubrication and depressurization. The lubricant supplied from the refueling pump includes a highly viscous grease in addition to a lubricating oil called liquid oil.

A discharge nipple 20 is fitted in the discharge portion 102 via an O-ring (O-ring) 201. A secondary side pipe (discharge tube) (not shown) leading to the lubricated portion is connected to the discharge nipple 20.

An oil guide pipe 30 whose inside is a lubricant passage 31 is arranged between the injection unit 101 and the discharge unit 102 on the central axis of the cylinder 10. In this example, the oil guide pipe 30 is integrally formed with the discharge nipple 20, but as shown in FIG. 4A, the oil guide pipe 30 and the discharge nipple 20 may be separate bodies.

A piston 40 is provided in the cylinder 10. An oil guide pipe 30 is inserted through the center of the piston 40, and the piston 40 has a start position (position shown in FIG. 1 (b)) and an end position (position shown in FIG. 1 (a)) along the oil guide pipe 30. It reciprocates between and.

An O-ring 401 is provided on the inner peripheral side of the piston 40 to seal (seal) the contact portion with the oil guide pipe 30, and on the outer peripheral side of the piston 40, contact with the inner peripheral surface of the cylinder 10 is provided. An O-ring 402 is provided to seal the portion.

In the cylinder 10, a compression type coil spring 43 for urging the piston 40 toward the start position is provided between the back portion 42 of the piston 40 and the inner bottom 21 of the discharge nipple 20.

In this example, an enlarged step portion 32 for defining the terminal position of the piston 40 is formed on the upper portion of the oil guide pipe 30. A guide cylinder 44 is slidably fitted to the outer periphery of the oil guide pipe 30.

A flange 441 that abuts on the back portion 42 of the piston 40 is formed at the lower end of the guide cylinder 44, and the end portion of the coil spring 43 is arranged on the flange 441. The guide cylinder 44 moves together with the piston 40, and the piston 40 rises to the end position where the upper end 442 of the guide cylinder 44 abuts on the step portion 32.

A relay chamber 50 is formed between the injection portion 101 and the inflow side end portion (lower end of the oil guide pipe 30 in FIG. 1) 301 on one end side of the oil guide pipe 30. The relay chamber 50 has a diameter smaller than the inner diameter of the cylinder 10 and communicates with the injection portion 101 and the cylinder 10.

An umbrella-shaped valve 51 is arranged in the relay chamber 50. The umbrella-shaped valve 51 has a valve seat 511 that opens and closes the inflow side end portion 301 of the oil guide pipe 30, and a hem portion (skirt portion) 512 that elastically contacts the inner peripheral surface of the relay chamber 50, and is preferable. The whole is made of rubber material.

The inside of the cylinder 10 is partitioned by a piston 40 into a measuring chamber 111 on the head 41 side and an oil storage chamber 112 on the back 42 side. The oil guide pipe 30 is provided with a lateral hole 33 that communicates with the oil storage chamber 112.

At the time of refueling from the refueling pump, as shown in FIG. 1A, the umbrella type valve 51 is pushed up by the hydraulic pressure, and the valve seat 511 abuts on the inflow side end portion 301 of the oil guide pipe 30 to guide the valve. While the inflow side end portion 301 of the oil pipe 30 is closed, the diameter of the hem portion 512 of the umbrella type valve 51 is forcibly reduced, and a gap is created between the hem portion 512 and the inner peripheral surface of the relay chamber 50.

As a result, the lubricant supplied from the refueling pump flows from the injection unit 101 into the measuring chamber 111 via the relay chamber 50, and the first flow path that pushes up the piston 40 against the urging force of the coil spring 43 is created. It is formed.

The piston 40 is pushed up to the end position where the upper end 442 of the guide cylinder 44 abuts on the stepped portion 32 of the oil guide pipe 30, whereby the lubricant for one lubrication cycle is measured in the measuring chamber 111.

When the refueling pump is switched to depressurization and the pressure of the injection portion 101 drops, as shown in FIG. 1 (b), the umbrella type valve 51 is pushed down by the urging force of the coil spring 43, and the hem portion 512 thereof expands. Since the diameter is increased and the relay chamber 50 is brought into close contact with the inner peripheral surface, the inflow side end portion 301 of the oil guide pipe 30 is opened, while the first flow path is blocked.

That is, the measuring chamber 111 and the lubricant passage 31 of the oil guide pipe 30 communicate with each other, the measuring chamber 111 and the injection portion 101 are separated, and the piston 40 is pushed back toward the starting position by the urging force of the coil spring 43. A second flow path is formed in which the lubricant in the measuring chamber 111 flows to the oil storage chamber 112 through the lubricant passage 31 and the lateral hole 33 of the oil guide pipe 30, and lubrication for one lubrication cycle is formed in the oil storage chamber 112. The agent is stored.

Then, at the time of refueling from the next refueling pump, the first flow path is formed, and at the time of depressurization, the lubricant stored in the refueling chamber 112 rises from the lateral hole 33 as the piston 40 rises. A third flow path is formed which flows through the oil guide pipe 30 and is discharged from the discharge port 202 of the discharge nipple 20 to the secondary side pipe.

As described above, in the first-out type quantitative distributor 1A, the piston 40 is pushed up by the refueling pressure of the refueling pump, and the lubricant stored in the refueling chamber 112 is discharged, resulting in high-pressure discharge.

In order to use the first-out type quantitative distributor 1A as the second-out method, the lateral hole 33 may be closed so that the oil storage chamber 112 is not used. The first embodiment will be described with reference to FIGS. 2 (a) and 2 (b).

The quantitative distributor 1B according to the first embodiment is configured to close the lateral hole 33 communicating the lubricant passage 31 in the oil guide pipe 30 and the oil storage chamber 112, and is a structure for closing the lubricant of the oil guide pipe 30 from the inside of the discharge nipple 20. It is provided with a closing pipe 23 that is inserted into the passage 31. The pipe 23, like the other components, is preferably made of brass.

The pipe 23 has a length extending from the upper end (the other end of the oil guide pipe 30) 311 of the lubricant passage 31 to the lower portion of the lateral hole 33 across the lateral hole 33, and has two upper and lower positions with the lateral hole 33 interposed therebetween. O-rings 231 and 232 for sealing are arranged in the. As a result, the oil storage chamber 112 is cut off from the lubricant passage 31.

Also in this fixed quantity distributor 1B, when the lubrication pump is refueled, the piston 40 is pushed up against the urging force of the coil spring 43 as shown in FIG. 2A, as in the case of the first-out type fixed quantity distributor 1A. The lubricant is weighed in the measuring chamber 111.

Then, when the lubrication pump is depressurized, as shown in FIG. 2B, the lubricant in the measuring chamber 111 is flowed into the lubricant passage 31 of the oil guide pipe 30 by the urging force of the coil spring 43. Since the lateral hole 33 is closed, the lubricant is directly flowed into the discharge nipple 20.

As described above, since the lubricant in the measuring chamber 111 is discharged by the urging force of the coil spring 43, the metering distributor 1B is a low-pressure discharge system.

Next, a second embodiment in which the first-out type quantitative distributor 1A is the second-out method will be described with reference to FIGS. 3 (a) and 3 (b).

In this second embodiment, instead of the pipe 23 dedicated to closing of the first embodiment, a discharge tube 24 for supplying a lubricant to a lubricated portion (not shown) is used, and one end thereof is a lubricant passage 31 of the oil guide pipe 30. Insert it to the position where the lateral hole 33 is closed.

Since a soft resin tube is usually used for this type of discharge tube 24, a metal abacus ball ring 241 is fitted to the discharge tube 24 to prevent the discharge tube 24 from easily coming off, and the discharge nipple 20 is used. It is advisable to screw the holding screw 242 inside and tighten the abacus ball ring 241 with the holding screw 242.

Next, a third embodiment of the present invention will be described with reference to FIG. In this third embodiment, the first-out type quantitative distributor 1A shown in FIG. 4A is changed to the second-out method.

In the quantitative distributor 1A of FIG. 4A, the discharge nipple 20 and the oil guide pipe 30 are formed as separate bodies. That is, the discharge nipple 20 includes an oil guide pipe fitting portion 25 into which the outflow side end portion 302 on the other end side of the oil guide pipe 30 is inserted and supports the outflow side end portion 302.

A sleeve 26 extending below the inner bottom 21 of the discharge nipple 20 is formed around the oil guide pipe fitting portion 25. The sleeve 26 has a diameter larger than that of the oil guide pipe 30 and surrounds the lateral hole 33 with a predetermined gap.

This gap is the in-sleeve flow path 261. When the refueling pump is depressurized, the lubricant in the measuring chamber 111 passes through the lubricant passage 31 of the oil guide pipe 30 → the lateral hole 33 → the in-sleeve flow path 261 as the second flow path. After that, it flows into the oil storage chamber 112. Then, at the time of refueling of the next refueling pump, the lubricant in the refueling chamber 112 reaches the discharge port 202 of the discharge nipple 20 via the in-sleeve flow path 261 → the lateral hole 33 → the outflow side end portion 302 of the oil guide pipe 30.

In order to change the first-out type quantitative distributor 1A of FIG. 4 (a) to the second-out method, in this third embodiment, as shown in FIG. 4 (b), an O-ring is placed at a position below the lateral hole 33. 27 is arranged so as to block the inner flow path 261 in the sleeve. According to this, since the oil storage chamber 112 and the oil guide pipe 30 are shut off, the first-out type quantitative distributor can be changed to the second-out method.

When closing the sleeve inner flow path 261 with the O-ring 27, it is preferable to increase the wall thickness of the sleeve 26 so that the inner diameter thereof is substantially equal to the outer diameter of the oil guide pipe 30 and to form a groove on the inner peripheral surface thereof. It is good to dig and fit the O-ring 27, and it can be done only by replacing the discharge nipple 20.

Further, according to the third embodiment, since the upper end 442 of the guide cylinder 44 comes into contact with the lower end 262 of the sleeve 26, the lower end 262 of the sleeve 26 can be used as a stopper that defines the end position of the piston 40.

In any case, according to the present invention, the first-out type quantitative distributor can be easily changed to the latter-type quantitative distributor, which is practical.

1A First-out type quantitative distributor 1B Later-out type quantitative distributor 10 Cylinder 101 Injection part 102 Discharge part 111 Weighing room 112 Oil storage room 20 Discharge nipple 202 Discharge port 21 Inner bottom 23 Pipe 24 Discharge tube 25 Oil guide pipe fitting part 26 Sleeve 261 In-sleeve flow path 27 O-ring (for closing the in-sleeve flow path)
30 Oil guide pipe 301 Inflow side end of oil guide pipe 302 Outflow side end of oil guide pipe 31 Lubricant passage 33 Side hole 40 Piston 41 Piston head 42 Piston back 43 Coil spring 44 Guide cylinder 50 Relay chamber 51 Umbrella type valve 511 Valve seat 512 Hem

Claims (5)

A cylinder having an injection part to which the lubricant is supplied from the primary side pipe of the refueling pump that repeats lubrication and depressurization alternately, and a discharge part to which the secondary side pipe to the lubricated part is connected.
An oil guide pipe whose inside is a lubricant passage and is arranged between the injection part and the discharge part,
The oil guide pipe is inserted through the center, and the piston that reciprocates between the start position near the injection part and the end position near the discharge part in the cylinder and the piston from the back side to the start position. The spring means to urge towards, and
A relay chamber that communicates with the cylinder with a diameter smaller than the inner diameter of the cylinder formed between the injection portion and one end side of the oil guide pipe.
It is equipped with an umbrella-shaped valve that is arranged in the relay chamber and switches the flow path according to the pressure at the time of refueling and the pressure at the time of decompression of the refueling pump.
The inside of the cylinder is partitioned by the piston into a measuring chamber on the head side and an oil storage chamber on the back side, and a lateral hole communicating with the oil storage chamber is formed in the oil guide pipe.
At the time of refueling from the refueling pump, the lubricant flows from the injection portion to the measuring chamber through the relay chamber with the one end side of the oil guide pipe blocked by the umbrella type valve, and the piston is the starting end. A first flow path is formed, which is pushed up from the position toward the terminal position against the urging force of the spring means.
When the lubrication pump is depressurized, the umbrella-shaped valve closes the first flow path, one end side of the oil guide pipe is opened, and the spring means pushes the piston back toward the starting position, and the measuring chamber is used. A second flow path is formed in which the lubricant of the above flows to the oil storage chamber through the oil guide pipe and the lateral hole.
At the time of refueling from the next refueling pump, the first flow path is formed, and at the time of depressurization, the lubricant stored in the refueling chamber flows from the lateral hole into the oil guide pipe and the discharge portion. In the first-out method quantitative distributor, the discharge method in which the third flow path is formed to be discharged from the secondary side pipe is
The side hole is closed to shut off the oil storage chamber and the oil guide pipe, and when the lubrication pump is depressurized, the lubricant in the measuring chamber is flowed from the oil guide pipe toward the discharge portion to perform a discharge method. A quantitative distributor characterized by being provided with a discharge method changing means for changing to a dispensing method. The quantitative distributor according to claim 1, wherein as the discharge method changing means, a closing pipe fitted from the discharge portion to a position where the lateral hole is closed is used in the oil guide pipe. The quantitative distributor according to claim 2, wherein the closing pipe is made of a metal pipe having a predetermined axial length. The quantitative distributor according to claim 2, wherein one end of a discharge tube connected to the discharge portion is used as the closing pipe. The cylinder is provided with a discharge nipple in the discharge portion, and the other end of the oil guide pipe is inserted into the discharge nipple to form a sleeve having a diameter larger than that of the oil guide pipe that surrounds the lateral hole with a predetermined gap. When the second flow path is formed, the lubricant passes through the side hole through the sleeve to reach the oil storage chamber, and when the third flow path is formed, the oil storage chamber passes through the sleeve and the side hole. In an embodiment including a flow path in the sleeve leading to the discharge port of the discharge nipple.
The quantitative distributor according to claim 1, wherein an O-ring that closes the flow path in the sleeve is used as the discharge method changing means at a position below the lateral hole.

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