JP2003097422A - Viscous fluidized material supply pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely make grease flow into a cylinder chamber from a suction passage even when a position of the suction passage communicating with a suction opening is apart from the bottom face of a vessel and resistance against grease flowing-in of the suction opening is large. SOLUTION: An oil supply pump is constituted in such a way that an inclined cam 11 is fixed to a drive shaft 7 driven by a drive device mounted on a lid of the vessel, grease is sucked into the cylinder chamber 13 through the suction passage 14 from the suction opening 12 by a suction force generated by raising a plunger 15 in accordance with the rotation of the rotating inclined cam 11, and a check valve is opened by pressure generated by lowering the plunger 15 in accordance with the rotation of the inclined cam 11 and pressing the grease sucked into the cylinder chamber 13 to discharge the grease into a discharge passage 21 from the opened check valve. A screw shaft 26 for feeding grease into the suction passage 14 from the suction opening 12 is connected with the drive shaft 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous fluid supply pump.

[0002]

2. Description of the Related Art A viscous fluid having a high viscosity such as grease is directly sucked from a commercially available container such as a drum can or a pail can and discharged at a high pressure in a small amount, so that the grease can be applied to the lubrication points of various machines such as industrial machines. Refueling pumps that can be supplied are known in the art. Thus, an example of such an oil supply pump is shown in FIGS. In FIG. 2, 1 is a container such as a drum or pail, 2 is a lid that closes the upper opening of the container 1, and the lid 2 is equipped with a drive device 5 equipped with an electric motor 3 and a speed reducer 4. Drive shaft 7 connected to 4
Penetrates through the lid 2 and rotatably projects into the container 1.

A hollow cylinder 8 having a drive shaft 7 extending therein is connected to the lower surface of the speed reducer 4 so as to be concentric with the drive shaft 7 and extends below the lower end of the drive shaft 7. A block 9 is connected to the lower end of the hollow cylinder 8 which extends. The vicinity of the lower end of the drive shaft 7 is rotatably supported by a bearing 10 that is fitted into the hollow cylinder 8. The lower end portion of the drive shaft 7 that protrudes below the bearing 10 has an inclined surface 11a on the lower surface. A cylindrical inclined cam 11 having is fixedly installed.

The block 9 is provided with a suction port 12 whose lower end is open and extends to the middle portion in the height direction, and the block 9 has a predetermined number (one or more may be used, but FIG.
In the case of two cylinders 13), the upper part of the cylinder chamber 13 penetrates the upper end of the block 9 and the lower part of the cylinder chamber 13 is located in the middle of the block 9 in the height direction. The suction passage 14 provided in the radial direction of the block 9 communicates with the position of the middle portion in the height direction near the lower end of the cylinder chamber 13.

A plunger 15 which can slide up and down is fitted in each cylinder chamber 13, and the upper end of the plunger 15 contacts an inclined surface 11a formed on the lower surface of the inclined cam 11 at the top. It is connected to a plunger receiver 16 having a spherical portion 16a. Further, a spring 17 whose lower end is supported by the upper surface of the block 9 and whose upper end is brought into contact with the lower surface of the flange portion 16b provided on the plunger receiver 16 and a portion of the plunger 15 projecting above the block 9 and the plunger. It is arranged so as to surround the outer circumference of the body of the receiver 16. Thus, the spring 17 can always urge the plunger receiver 16 and the plunger 15 upward.

An oil chamber 20 is provided at the lower end of each cylinder chamber 13 provided in the block 9 so that the cylinder chamber 13 can be communicated with the cylinder chamber 13 by a portion which is not closed by a plug 19.
Are formed. Thus, the block 9 is formed with a discharge passage 21 having one end communicating with the oil chamber 20 and the other end opening to the outside of the block 9. A supply pipe 22 penetrating 2 for supplying grease to a lubrication point of the machine is connected.

A valve seat body 23 is housed in the oil chamber 20 such that the upper end of the oil chamber 20 contacts the upper surface of the oil chamber 20. Thus, the valve seat body 23 has a flow path 23a whose upper end communicates with the cylinder chamber 13 and whose lower end opens to the oil chamber 20, and has a lower end provided with a valve seat 23b formed in a concave shape.

A check ball 24 adapted to come into contact with the valve seat 23b is accommodated in the oil chamber 20, and
The lower end of the check ball 24 is supported by the bottom of the recess 19a of the plug 19 and the upper end thereof is supported by a spring 25 that can contact the check ball 24. The check ball 24 is constantly urged upward by the spring 25. It has become so. Thus, a check valve is formed by the valve seat body 23 having the flow path 23a and the valve seat 23b, the check ball 24 that can come into contact with the valve seat 23b, and the spring 25.

When the grease is supplied to the oil supply location of the machine by the oil supply pump, the drive device 5 is driven. Then, as the drive shaft 7 rotates, the tilt cam 11 rotates. Therefore, of the two plungers 15 pressed against the inclined surface 11a of the inclined cam 11 via the plunger receiver 16, one of the plungers 15 (for example, FIG.
The plunger 15) on the right side of the cylinder chamber 1 rises to the vicinity of the upper edge of the suction passage 14 due to the urging force of the spring 17,
3 is enlarged (see the cylinder chamber 13 on the right side of FIG. 3).

Therefore, the internal pressure of the cylinder chamber 13 becomes a negative pressure and a suction force is generated, so that the grease in the container 1 is sucked from the suction port 12 and is sucked from the suction passage 14 to the cylinder chamber 13 on the right side of FIG. Is sucked into. On this occasion,
The check ball 24 of the check valve on the right side of FIG. 3 is urged by the spring 25 to move upward, and is in contact with the valve seat 23b of the valve seat body 23. Therefore, grease is discharged from the cylinder chamber 13 on the right side of FIG. There is no leakage to the road 21 side.

On the other hand, of the two plungers 15 pressed against the inclined surface 11a of the inclined cam 11 via the plunger receiver 16, the other plunger 15 (for example, the plunger 15 on the left side in FIG. 3) has a spring 17 The gravitational force is overcome to move down, and the grease sucked into the cylinder chamber 13 on the left side of FIG. 3 in the previous step is pressed downward. Therefore, the internal pressure of the lower cylinder chamber 13 pressed by the other plunger 15 increases, and as a result, the check ball 24 of the check valve on the left side in FIG. 23b, the check valve is opened.

Therefore, the left cylinder chamber 13 and the oil chamber 2
As a result of communicating with 0 through the flow path 23a of the valve seat body 23,
The grease sucked into the left cylinder chamber 13
From the flow passage 23a of the valve seat body 23 through the oil chamber 20, the discharge passage 21
Is discharged to the refueling point from the discharge passage 21 through the supply pipe 22.

Further, when the tilt cam 11 is rotated by the rotation of the drive shaft 7 and the tilt direction of the tilt surface 11a is opposite to that shown in FIG. 3, the left side cylinder chamber 13 in FIG. 3 is sucked into the cylinder chamber 13 on the right side of FIG. 3, the grease is discharged from the flow passage 23 a of the valve seat 23 on the right side through the oil chamber 20 to the discharge passage 21, and is supplied from the discharge passage 21. It is supplied to the refueling point through the pipe 22.

Thus, the left and right plungers 15 are alternately moved up and down by the rotation of the drive shaft 7 and the inclined cam 11, and as a result, the grease is smoothly supplied to the lubrication location. Even if the number of the plungers 15 is one or three or more, the operation is performed in the same manner as in the case described above and the fuel is supplied.

[0015]

In the above oil supply pump, in order to allow the grease to be sucked into the cylinder chamber 13 of the oil supply pump even when the residual amount of grease in the container 1 is small, the oil supply pump has a suction port 12 at its inlet port. It is necessary to provide the communicating suction passage 14 as close to the bottom surface of the container 1 as possible. However, in the conventional fuel pump, the distance L from the lower end of the suction port 12 to the suction passage 14 becomes long.

For this reason, the grease inflow resistance of the suction port 12 increases, and the inflow of grease into the cylinder chamber 13 is interrupted. As a result, a void is formed in the cylinder chamber 13 and the pump operation is idle. Inconvenient phenomenon may occur.

In view of the above situation, the present invention ensures that even when the position of the suction passage communicating with the suction port is separated from the bottom surface of the container and the inflow resistance of viscous fluid such as grease at the suction port is large. Another object of the present invention is to provide a viscous fluid supply pump capable of allowing the viscous fluid to flow into the cylinder chamber from the suction passage.

[0018]

A viscous fluid supply pump according to claim 1 is a drive shaft driven by a drive device mounted on a lid of a container capable of storing the viscous fluid, and the drive shaft. A tilt cam fixed to the drive shaft so as to rotate together with the tilt cam and having a lower surface with a tilt surface, and an indirect or direct contact with the tilt surface of the tilt cam that is biased upward by a spring means, and a cylinder The viscous fluid sucked from the suction port should be sucked into the cylinder chamber by the plunger capable of moving up and down so as to be slidable in the chamber and the suction force generated when the plunger is raised as the tilt cam rotates. When the viscous fluid is sucked into the cylinder chamber due to the suction path provided so that the suction port and the cylinder chamber communicate with each other and the plunger moves up, the plug is closed. When the viscous fluid is discharged from the cylinder chamber by lowering the jar, a check valve that is opened when the viscous fluid is discharged from the cylinder chamber, and a viscous fluid that is discharged when the check valve is opened are supplied to the outside. And a screw shaft for feeding the viscous fluid from the suction port to the suction passage.

In the viscous fluid supply pump of the second aspect, the plunger is connected to the plunger receiver whose upper end is in contact with the inclined surface of the inclined cam.

In the viscous fluid supply pump according to the third aspect of the present invention, the screw shaft is connected to the drive shaft and can be rotated by the rotation of the drive shaft.

In the viscous fluid supply pump of the present invention, the tilt cam is rotated by driving the drive shaft,
The plunger moves up and down in the cylinder chamber as the tilting cam rotates. When the plunger moves up in the cylinder chamber, a negative pressure is generated in the cylinder chamber and a suction force is generated, so that the viscous fluid in the container is sucked into the cylinder chamber from the suction port through the suction passage. At this time, since the screw shaft provided at the suction port rotates, the viscous fluid is forcibly moved up the suction port by the screw and fed to the suction passage.

When the plunger descends the cylinder chamber,
When the viscous fluid is pressed, the pressure of the viscous fluid rises and the check valve opens, so that the viscous fluid in the cylinder chamber is discharged from the check valve to the discharge passage and fed to a predetermined external position.

According to the present invention, even when the distance from the lower end of the suction port to the suction passage is long and the viscous fluid inflow resistance of the suction port is large, the viscous fluid can be easily and reliably removed from the suction port and the suction passage. Since it can be made to flow into the cylinder chamber, and therefore the cylinder chamber can be reliably filled with viscous fluid, there is no blanking and the pump discharge performance is dramatically improved, and the viscous fluid remaining in the container Even if the body is small, it can be surely inhaled and discharged.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an example of an embodiment for carrying out the present invention. In the figure, parts designated by the same reference numerals as those in FIGS. It is similar to the one. The feature of this illustrated example is that the screw shaft 26 is provided as shown in FIG.

That is, the screw shaft 26 is connected to the lower end of the drive shaft 7, extends downward, penetrates the axial center portion of the block 9 and extends into the suction port 12, and the lower end thereof is the suction port. It projects slightly below 12. Further, a spiral screw 26a having an outer diameter slightly smaller than the inner circumference of the suction port 12 is provided at a portion of the screw shaft 26 located inside the suction port 12 and a portion protruding downward from the suction port 12. is there.

Next, the operation of the illustrated example will be described. Also in the illustrated example, the drive device 5 is driven when the grease is supplied to the oil supply location of the machine by the viscous fluid supply pump. Therefore, the drive shaft 7 and the tilt cam 11 rotate, and as a result, the left and right plungers 15 alternately move up and down in the same manner as in the conventional case, and when rising, the portion of the cylinder chamber 13 below the lower end of the plunger 15 moves. When the negative pressure is applied and a suction force is generated, the grease is sucked into the suction port 12 and the suction passage 1.
4 is sucked into a portion of the cylinder chamber 13 below the lower end of the plunger 15 and, when descending, the grease sucked into the cylinder chamber 13 is pressed by the plunger 15 to flow from the cylinder chamber 13 to the flow passage 23a of the valve seat body 23. The discharge path 2 is passed through the oil chamber 20 with the check ball 24 opened.
1, and is supplied from the supply pipe 22 to the refueling point.

At this time, since the screw shaft 26 also rotates due to the rotation of the drive shaft 7, the grease in the container 1 is sent upward through the suction port 12 by the screw 26a. Therefore, in addition to the suction force generated in the cylinder chamber 13, the grease is fed from the suction port 12 to the suction passage 14 by the upward mechanical forcing force of the screw 26a, and passes through the suction passage 14 to pass through the cylinder chamber 13. 13 is introduced.

Therefore, according to the fuel pump of the illustrated example,
The distance L from the lower end of the suction port 12 to the suction passage 14 is long,
Even when the grease inlet resistance of the suction port 12 is large, the grease can be easily and reliably supplied from the suction port 12 and the suction passage 14 to the cylinder chamber 13. Therefore, the cylinder chamber 1
Since the inside of 3 can be surely filled with grease,
There is no runaway and pump discharge performance is dramatically improved. Further, according to the oil supply pump of the illustrated example, even if the amount of grease remaining in the container 1 is small, it can be surely sucked and discharged.

In the embodiment of the present invention, the case where the pump is applied to grease has been described. However, not only grease but also various viscous fluids can be applied, and the plunger is inclined via the plunger receiver. The case of contacting the inclined surface of the cam has been described, but it is also possible to make the upper end of the plunger spherical and directly contact the inclined surface of the inclined cam. Of course, various changes can be made within.

[0030]

As described above, the first aspect of the present invention is as described above.
According to the viscous fluid supply pumps described in 1 to 3, even if the distance from the lower end of the suction port to the suction passage is long and the viscous fluid inflow resistance of the suction port is large, the viscous fluid can be sucked in easily and reliably. Also, the cylinder chamber can be made to flow into the cylinder chamber through the suction passage, so that the cylinder chamber can be reliably filled with the viscous fluid, so that there is no blanking and the pump discharge performance is dramatically improved. Even if a small amount of the viscous fluid remains, it can be surely sucked and discharged, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional view showing an example of an embodiment of the present invention when a viscous fluid supply pump is an oil supply pump.

FIG. 2 is an overall front view showing a state where an oil supply pump is installed in a container.

FIG. 3 is a vertical cross-sectional view showing an example of a conventional oil supply pump.

FIG. 4 is an enlarged view of a portion IV in FIG.

[Explanation of symbols]

1 container 2 lid 5 drive 7 drive shaft 11 Inclined cam 11a inclined surface 12 Suction port 13 cylinder chamber 14 Suction path 15 Plunger 16 Plunger receiver 17 Spring (Spring means) 21 discharge path 22 Supply pipe (external) 26 screw shaft

Continued front page    F-term (reference) 3H070 AA01 BB04 BB07 BB15 BB17                       CC21 CC22 DD08 DD64 DD66                       DD68 DD85                 3H071 AA04 BB01 BB05 CC11 CC13                       CC14 CC15 DD11 DD32 DD72                 3H075 AA04 AA17 BB03 BB16 BB17                       BB21 CC25 DA07 DA11

Claims (3)

[Claims] 1. A drive shaft driven by a drive device mounted on a lid of a container capable of accommodating a viscous fluid, a drive shaft fixed so as to rotate together with the drive shaft, and a bottom surface. An inclined cam having an inclined surface, and a vertically movable plunger that is urged upward by a spring means to contact the inclined surface of the inclined cam indirectly or directly and to be slidable in the cylinder chamber, Suction provided so that the suction port and the cylinder chamber communicate with each other so that the viscous fluid sucked from the suction port is sucked into the cylinder chamber by the suction force generated by the plunger rising as the tilt cam rotates. When the viscous fluid is sucked into the cylinder chamber by the passage and the plunger rising, it is closed, and when the plunger descends, the viscous fluid is viscous from the cylinder chamber. A viscous fluid supply pump including a check valve that is opened when fluid is discharged, and a discharge passage that is configured to supply the viscous fluid discharged by opening the check valve to the outside. A screw shaft for driving the viscous fluid from the suction port to the suction passage is drivably disposed at the suction port. 2. The viscous fluid supply pump according to claim 1, wherein the plunger is connected to a plunger receiver whose upper end is in contact with the inclined surface of the inclined cam. 3. The viscous fluid supply pump according to claim 1, wherein the screw shaft is connected to a drive shaft and is configured to be rotatable by the rotation of the drive shaft.