JP6786103B2 - Coolant liquid transfer pump - Google Patents

Description

The present invention relates to a coolant liquid transfer pump for transferring a coolant liquid containing foreign matter such as cutting chips discharged from a machine tool, and particularly belongs to the technical field of a structure provided with a cutting blade for cutting the foreign matter.

For example, foreign matter such as chips and cutting chips is mixed in the coolant liquid discharged from the machine tool. The coolant mixed with foreign matter is transferred to a filtration device or a centrifuge by a coolant transfer pump to separate the foreign matter from the coolant, and the coolant is reused (for example, Patent Documents). 1).

The coolant transfer pump of Patent Document 1 has a drive shaft that is rotationally driven by an electric motor, a pump mechanism that is connected to the lower part of the drive shaft, and a pair that is fixed above the pump mechanism in the drive shaft to cut foreign matter. It is provided with a cutting blade and a rotary blade and a fixed blade provided between the cutting blade and the pump mechanism. Then, the foreign matter guided to the inside of the casing by the guide plate is cut by the rotating cutting blade, and is also cut by the rotary blade and the fixed blade arranged below the cutting blade to become finer, and then the pump. Transferred with coolant by mechanism.

Japanese Unexamined Patent Publication No. 2012-233457

By the way, many of the foreign substances mixed in the coolant liquid have a spiral shape and a certain length, and they may enter the inside of the casing in a state of being entangled and agglomerated. At this time, in the coolant transfer pump of Patent Document 1, a pair of cutting blades are provided inside the casing at intervals of upper and lower, and are provided at a predetermined interval with respect to the inner surface of the casing. There is a space inside the casing without cutting blades. When the agglomerated foreign matter reaches the space without the cutting blades, the foreign matter is not cut by the cutting blades and remains accumulated inside the casing, and as a result, the foreign matter may not be transferred together with the coolant liquid.

The present invention has been made in view of this point, and an object of the present invention is to prevent lumpy foreign matter from remaining accumulated inside the casing so that it can be transferred together with the coolant liquid.

In order to achieve the above object, in the present invention, when a lumpy foreign matter enters the inside of the casing, the foreign matter can be crushed.

The first invention is a coolant liquid transfer pump for transferring a coolant liquid containing foreign matter together with the foreign matter, which is formed so as to surround a drive shaft extending in the vertical direction and the drive shaft, and the coolant liquid containing the foreign matter is mixed. A casing having an inflow port for flowing in, a pump mechanism provided in the lower part of the casing and driven by the drive shaft, and a pump mechanism provided inside the casing and driven by the drive shaft and flowing in from the inflow port. It is provided with a cutting blade that cuts foreign matter and a protruding portion that protrudes from the inner peripheral surface of the casing and is arranged so that the foreign matter that has flowed in from the inflow port hits the inside of the casing. An upper cutting blade and a lower cutting blade that are arranged apart and driven by the drive shaft are provided, and the upper cutting blade and the lower cutting blade each extend outward in the radial direction of the drive shaft. It has a blade portion, and the protruding portion is provided at a portion separated from the central portion of the inflow port by 90 ° or more in the circumferential direction of the drive shaft, and the upper cutting blade and the lower cutting blade are provided. It has a plate-shaped portion that is arranged between them and is formed so that the dimension in the vertical direction is longer than the dimension in the protruding direction, and the tip of the plate-shaped portion is the blade of the upper cutting blade. It is characterized in that it is closer to the drive shaft than the tip of the portion and the tip of the blade portion of the lower cutting blade .

According to this configuration, the foreign matter flowing in from the inlet of the casing is cut by the cutting blades and transferred together with the coolant by the pump mechanism. For example, when a lumpy foreign matter flows into the casing, it moves around the drive shaft by the rotation of the drive shaft and the cutting blade, and this movement causes the foreign matter to hit the protrusion, and the force at that time causes the lumpy foreign matter to move. It is crushed and becomes smaller. As a result, foreign matter is likely to fall downward and can be transferred by the pump mechanism, so that it is unlikely to remain accumulated inside the casing.

Further, a space without cutting blades is formed between the upper cutting blade and the lower cutting blade, and a lump of foreign matter tends to stay in this space. However, in the present invention, the upper cutting blade and the lower cutting blade are cut. Since the protruding portion is arranged between the blades, the massive foreign matter existing between the upper cutting blade and the lower cutting blade hits the protruding portion and is crushed and transferred by the pump mechanism.

Further, the foreign matter flowing into the casing from the inflow port moves so as to rotate around the drive shaft due to the rotation of the cutting blade, but at this time, the protruding portion is separated from the inflow port in the circumferential direction of the drive shaft. By being present, it is unlikely to become an obstacle when foreign matter flows in.

Further, the lumpy foreign matter existing in the predetermined range in the vertical direction inside the casing surely hits the plate-shaped portion of the protruding portion and is crushed to become smaller.

In the second invention, in the first invention, a fixing plate having a plurality of openings for communicating the inside of the casing and the inside of the pump mechanism is provided in the lower part of the casing and driven by the drive shaft. A rotary blade for shearing the foreign matter that has entered the opening of the fixing plate is provided below the fixing plate.

According to this configuration, when the foreign matter flowing into the casing enters the opening of the fixing plate, it is sheared by the rotation of the rotary blade and becomes smaller. At this time, since there are a plurality of openings in the fixing plate and a large area where foreign matter can be discharged is secured, the foreign matter easily flows into the inside of the pump mechanism, and the amount of foreign matter processed per unit time increases, and as a result. , The amount of foreign matter staying inside the casing is reduced.

According to a third aspect of the present invention, in the second invention, the pump mechanism has a pump housing, and a suction port communicating with the opening of the fixing plate and a periphery of the suction port are provided on the upper portion of the pump housing. It is characterized in that a guide surface is provided so as to guide the foreign matter passing through the opening toward the suction port so as to be located lower as the suction port approaches the suction port. And.

According to this configuration, the foreign matter that has passed through the opening of the fixing plate is guided toward the suction port by the guide surface, so that the foreign matter is smoothly sucked into the inside of the pump housing from the suction port .

According to the first invention, since the protruding portion on which the foreign matter flowing in from the inlet of the casing hits is provided so as to protrude from the inner peripheral surface of the casing, the lumpy foreign matter can be crushed by the protruding portion to make it smaller. .. As a result, the lumpy foreign matter is unlikely to remain accumulated inside the casing and can be transferred together with the coolant liquid.

Further, since the protruding portion is arranged between the upper cutting blade and the lower cutting blade, the massive foreign matter existing between the upper cutting blade and the lower cutting blade is crushed by the protruding portion and transferred by the pump mechanism. This makes it possible to further reduce the amount of foreign matter retained inside the casing.

Further, since the protruding portion is provided at a portion separated from the inflow port in the circumferential direction of the drive shaft, the protruding portion does not easily become an obstacle when the foreign matter flows in, and the foreign matter can smoothly flow into the inside of the casing. ..

Further, since the protruding portion has a plate-shaped portion extending in the vertical direction, it is possible to crush and reduce the lumpy foreign matter existing in the predetermined range in the vertical direction inside the casing.

According to the second invention, a fixing plate having a plurality of openings communicating with the inside of the pump mechanism is provided at the lower part of the casing, and a rotary blade for shearing foreign matter entering the openings of the fixing plate is provided below the fixing plate. Since it is provided, the amount of foreign matter processed per unit time can be increased, and the amount of foreign matter staying inside the casing can be reduced.

According to the third invention, a suction port communicating with the opening of the fixing plate is provided in the upper part of the pump housing, and a guide surface for guiding foreign matter toward the suction port is provided around the suction port. Foreign matter can be smoothly sucked into the pump housing, and the amount of foreign matter staying inside the casing can be further reduced .

It is a vertical sectional view of the coolant liquid transfer pump which concerns on embodiment. It is a top view of a fixed plate. It is a top view of a rotary blade. It is a side view of the protrusion. It is a top view of the protrusion. It is a front view of the protrusion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

FIG. 1 shows a coolant transfer pump 1 according to an embodiment of the present invention. The coolant liquid transfer pump 1 is installed in a tank 100 having a schematic shape as shown by a virtual line. The used coolant liquid flows into the tank 100 from the left side of FIG. 1, and the coolant liquid flowing into the tank 100 is on the downstream side together with the foreign matter mixed in the coolant liquid by the coolant liquid transfer pump 1. Transferred to a filter or centrifuge (not shown). The coolant liquid is discharged from, for example, a machine tool (not shown), and therefore, the foreign matter mixed in the coolant liquid is, for example, chips or cutting chips. The coolant containing foreign matter is transferred to the filtration device or the centrifuge by the coolant transfer pump 1, and then the foreign matter and the coolant are separated so that the coolant is reused.

The coolant liquid transfer pump 1 includes an electric motor 2, a casing 3, a drive shaft 4, an upper cutting blade 5, a lower cutting blade 6, a pump mechanism 7, a fixing plate 8, and a rotary blade 9. ing. Since the electric motor 2 is well known, detailed description thereof will be omitted. The electric motor 2 is provided above the coolant transfer pump 1, and is arranged so that the center line extends substantially in the vertical direction. A drive shaft 4 extending in the vertical direction is fixed to the output shaft of the electric motor 2. The drive shaft 4 projects downward from the output shaft of the electric motor 2. A large-diameter portion 4a is provided on the upper portion of the drive shaft 4, and by providing the large-diameter portion 4a, an upper step portion 4b is formed on the upper portion of the outer peripheral surface of the drive shaft 4. Further, a small diameter portion 4c is provided in the lower portion of the drive shaft 4, and by providing the small diameter portion 4c, a lower step portion 4d is formed in the lower portion of the outer peripheral surface of the drive shaft 4. Further, the lower end surface of the drive shaft 4 is provided with a screw shaft portion 4e having a screw groove formed on the outer peripheral surface so as to project downward.

The casing 3 has a cylindrical member 30 formed in a substantially cylindrical shape surrounding the drive shaft 4, and an upper plate 31 provided so as to close the upper end of the tubular member 30. The lower end of the electric motor 2 is fixed to the upper plate 31. Further, a support plate 32 for supporting the upper end portion (downstream end portion) of the discharge pipe 101 is provided around the upper plate 31. The upper plate 31 and the support plate 32 are fixed to the upper end portion of the tubular member 30. Further, the upper plate 31 is provided with a cylindrical fixed side cover 31a formed so as to surround the upper portion of the outer peripheral surface of the drive shaft 4.

A substantially circular fixing plate 8 is provided at the lower part of the casing 3. As shown in FIG. 2, an insertion hole 8a into which the drive shaft 4 is inserted is formed in the central portion of the fixing plate 8. Further, a plurality of openings 8b, 8b, ... That communicate the inside of the casing 3 and the inside of the pump mechanism 7 are formed around the insertion hole 8a of the fixing plate 8. These openings 8b, 8b, ... Are arranged so as to be spaced apart from each other in the circumferential direction of the fixing plate 8. Further, each opening 8b has a shape long in the radial direction of the fixing plate 8, and the opening width thereof becomes wider toward the outer side in the radial direction.

A mounting hole 8c is formed on the outer peripheral portion of the fixing plate 8. The mounting hole 8c is for fixing the fixing plate 8.

The left side of FIG. 1 in the tubular member 30 is the side on which the coolant containing foreign matter flows, that is, the upstream side. An inflow port 30a is formed on the left side of the tubular member 30 to allow the coolant liquid containing foreign matter to flow in. The inflow port 30a opens over a wide range from the vicinity of the lower portion to the vicinity of the upper portion on the left side of the tubular member 30, and has a shape close to a substantially circular shape when the tubular member 30 is viewed from the left side. An inflow pipe portion 30b is provided on the peripheral edge portion of the inflow port 30a so as to project upstream from the tubular member 30. A flange 30c is provided at the upstream end (left end) of the inflow pipe portion 30b. A coolant flow pipe 102 through which a coolant containing foreign matter flows is connected to the flange 30c. The coolant liquid flow pipe 102 is a member that constitutes a part of the tank 100. By providing the flange 30c, the coolant liquid flow pipe 102 can be easily connected to the casing 3.

Further, a flushing water passage hole 30d is formed in the tubular member 30 of the casing 3. The flushing water passage hole 30d is located at a portion separated from the inflow port 30a around the center line of the drive shaft 4, and is connected to an external pipe (not shown) when the coolant liquid transfer pump 1 is used. The water in the pipe can be introduced into the casing 3. The flushing water passage hole 30d is arranged below the central portion of the casing 3 in the vertical direction. Further, the flow of water introduced from the flushing water passage hole 30d is aligned with the rotation direction of the drive shaft 4. Such a flow of water makes it possible to prevent foreign matter from staying by being blown off by water pressure when it is biased around the casing 3. The coolant transfer pump 1 may be operated without introducing water from the flushing water passage hole 30d.

The upper cutting blade 5 and the lower cutting blade 6 are provided inside the casing 3 in a state of being spaced apart from each other in the vertical direction, and are driven by the drive shaft 4 to cut the foreign matter flowing in from the inflow port 30a. It is a thing. The upper cutting blade 5 is provided with a plurality of blade portions 5a and 5a extending in the radial direction of the drive shaft 4 at intervals in the circumferential direction of the drive shaft 4, and the tip portions of the blade portions 5a and 5a are cylinders. It is close to the inner peripheral surface of the shaped member 30. Similar blade portions 6a and 6a are also provided on the lower cutting blade 6.

A tubular upper spacer 10 is provided on the upper portion of the upper cutting blade 5. A portion of the drive shaft 4 between the large diameter portion 4a and the small diameter portion 4c is inserted into the upper spacer 10. The upper spacer 10 is adapted to be fitted from below with respect to the upper step portion 4b of the drive shaft 4. A shaft cover 11 is fixed to the outer peripheral portion of the upper spacer 10. The shaft cover 11 is formed in a cylindrical shape that surrounds the fixed side cover 31a from the outside. A gap is provided between the inner peripheral surface of the shaft cover 11 and the outer peripheral surface of the fixed side cover 31a so that the shaft cover 11 does not come into contact with the fixed side cover 31a when the shaft cover 11 is rotated by the rotation of the drive shaft 4. It has become. Further, the gap between the inner peripheral surface of the shaft cover 11 and the outer peripheral surface of the fixed side cover 31a is set to be narrow, making it difficult for foreign matter inside the casing 30 to pass through the gap. This makes it difficult for foreign matter to enter the bearing (not shown) of the motor 2.

A tubular intermediate first spacer 12 is provided between the upper cutting blade 5 and the lower cutting blade 6. A portion between the large diameter portion 4a and the small diameter portion 4c of the drive shaft 4 is inserted into the intermediate first spacer 12. The intermediate first spacer 12 is for setting the distance between the upper cutting blade 5 and the lower cutting blade 6.

A tubular intermediate second spacer 13 is provided on the lower side of the lower cutting blade 6. A portion between the large diameter portion 4a and the small diameter portion 4c of the drive shaft 4 is inserted into the intermediate second spacer 13. A rotary blade 9 is provided below the intermediate second spacer 13. The intermediate second spacer 13 is for setting the distance between the lower cutting blade 6 and the rotary blade 9.

The rotary blade 9 is driven by a drive shaft 4 and is for shearing foreign matter that has entered the openings 8b, 8b, ... Of the fixing plate 8, and is arranged below the fixing plate 8. As shown in FIG. 3, an insertion hole 9a into which the drive shaft 4 is inserted is formed in the central portion of the rotary blade 9. A plurality of protruding blades 9b, 9b, 9b protruding in the radial direction are integrally molded on the rotary blade 9. The protruding blades 9b, 9b, 9b are adapted to rotate along the lower surface of the fixing plate 8. A tubular lower spacer 14 is provided on the lower side of the rotary blade 9. A portion of the drive shaft 4 between the large diameter portion 4a and the small diameter portion 4c is inserted into the lower spacer 14.

The pump mechanism 7 is provided in the lower part of the casing 3 and is driven by the drive shaft 4. The pump mechanism 7 has an impeller 70 and a pump housing 71 for accommodating the impeller 70. An insertion hole 70a into which the small diameter portion 4c of the drive shaft 4 is inserted is formed in the central portion of the impeller 70. A nut N is screwed into the screw shaft portion 4e of the drive shaft 4. By screwing the nut N into the screw shaft portion 4e, the impeller 70, the lower spacer 14, the rotary blade 9, the intermediate second spacer 13, the lower cutting blade 6, the intermediate first spacer 12, the upper cutting blade 5 and the upper portion The spacer 10 is tightened in the vertical direction and fixed to the drive shaft 4.

Further, the drive shaft 4 is provided with a key 41. The key 41 is adapted to engage with the upper spacer 10, the upper cutting blade 5, the intermediate first spacer 12, the lower cutting blade 6, the intermediate second spacer 13, the rotary blade 9, and the lower spacer 14.

The pump housing 71 has a peripheral wall portion 72, an upper wall portion 73, and a lower wall portion 74. On the right side of the peripheral wall portion 72, a connecting pipe portion 72a to which the lower end portion (upstream end portion) of the discharge pipe 101 is connected is formed. The coolant liquid mixed with foreign matter is discharged from the connecting pipe portion 72a.

The upper wall portion 73 is fixed to the upper end portion of the peripheral wall portion 72. A substantially circular suction port 73a communicating with the opening 8b of the fixing plate 8 is formed in the central portion of the upper wall portion 73. Further, a guide surface 73b is formed around the suction port 73a in the upper wall portion 73 to guide the foreign matter that has passed through the opening 8b toward the suction port 73a. The guide surface 73b is formed so as to be located lower as it approaches the suction port 73a, and is shaped so that foreign matter on the guide surface 73b flows toward the suction port 73a by gravity. Further, a groove 73c is formed on the guide surface 73b of the upper wall portion 73. The groove 73c extends radially from the peripheral edge of the suction port 73a.

A communication port 74a for communicating the inside of the pump housing 71 with the inside of the tank 100 is formed in the central portion of the lower wall portion 74. The communication port 74a is located near the bottom of the tank 100 and serves as a lower suction port.

In this embodiment, the gap between the upper end portion of the impeller 70 and the inner surface of the upper wall portion 73 is narrowed, and the gap between the lower end portion of the impeller 70 and the inner surface of the lower wall portion 74 is also narrowed. Specifically, foreign matter is hardly allowed to enter between the upper end portion of the impeller 70 and the inner surface of the upper wall portion 73, and between the lower end portion of the impeller 70 and the inner surface of the lower wall portion 74. .. As a result, the pump performance can be improved and the amount of feed per unit time can be increased.

Further, in this embodiment, the blade height of the impeller 70 is increased. As a result, foreign matter that has flowed into the center of the impeller 70 from above easily passes between the blades of the impeller 70 and flows outward in the radial direction.

As shown in FIG. 1, the casing 3 is provided with a protruding portion 50 that projects inward in the radial direction from the inner peripheral surface of the tubular member 30. The protruding portion 50 is arranged so as to hit the foreign matter flowing in from the inflow port 30a of the casing 3. As shown in FIGS. 4 to 6, the projecting portion 50 has a mounting portion 51 and a plate-shaped portion 52 integrated with the mounting portion 51, and one metal plate material is bent at a substantially right angle. It is composed of. The mounting portion 51 extends in the vertical direction along the inner peripheral surface of the tubular member 30. Mounting holes 51a and 51a penetrating in the thickness direction are formed in the mounting portion 51. A fastening member 53 (shown in FIG. 1) made of bolts or the like is inserted into each mounting hole 51a. The protruding portion 50 can be fixed to the tubular member 30 by screwing the fastening member 53 inserted into each mounting hole 51a into the screw hole formed in the tubular member 30.

The protrusion 50 is arranged between the upper cutting blade 5 and the lower cutting blade 6. The plate-shaped portion 52 extends in the vertical direction between the upper cutting blade 5 and the lower cutting blade 6. The upper edge portion of the plate-shaped portion 52 extends substantially parallel to the lower surface of the blade portions 5a and 5a of the upper cutting blade 5. Further, the lower edge portion of the plate-shaped portion 52 extends substantially parallel to the upper surfaces of the blade portions 6a and 6a of the lower cutting blade 6. A gap is formed between the lower surfaces of the blade portions 5a and 5a of the upper cutting blade 5 and the upper edge portion of the plate-shaped portion 52. Further, a gap is also formed between the upper surfaces of the blade portions 6a and 6a of the lower cutting blade 6 and the lower edge portion of the plate-shaped portion 52. Further, the separation dimension between the plate-shaped portion 52 and the outer peripheral surface of the intermediate first spacer 12 can be set by the amount of protrusion of the tubular member 30 from the inner peripheral surface of the plate-shaped portion 52. In this embodiment, a small foreign matter can pass between the plate-shaped portion 52 and the outer peripheral surface of the intermediate first spacer 12, but the separation dimension is set so that a large lump-shaped foreign matter cannot pass through. There is.

Further, the protruding portion 50 is provided at a portion separated from the inflow port 30a of the casing 3 in the circumferential direction of the drive shaft 4. Specifically, the protruding portion 50 is arranged 180 ° away from the central portion of the inflow port 30a of the casing 3 in the circumferential direction of the drive shaft 4. The protruding portion 50 is preferably separated from the central portion of the inflow port 30a of the casing 3 by at least 90 ° or more in the circumferential direction of the drive shaft 4. This is because when the protruding portion 50 is close to the inflow port 30a of the casing 3, the protruding portion 50 tends to become an obstacle when the foreign matter flows in, and the foreign matter does not flow in smoothly.

(Explanation of operation of the coolant transfer pump)
Next, the operation of the coolant liquid transfer pump 1 configured as described above will be described. The coolant liquid mixed with foreign matter flows into the inside of the casing 3 from the inflow port 30a via the coolant liquid flow pipe 102. At this time, since the upper cutting blade 5 and the lower cutting blade 6 are rotated by the electric motor 2, the foreign matter flowing into the casing 3 is cut by the upper cutting blade 5 and the lower cutting blade 6.

Further, since the drive shaft 4, the upper cutting blade 5 and the lower cutting blade 6 rotate inside the casing 3, a flow around the drive shaft 4 is formed inside the casing 3. Foreign matter flows around the drive shaft 4 by this flow. At this time, the foreign matter may be lumpy, and the lumpy foreign matter moves so as to flow around the drive shaft 4. Due to this movement, the foreign matter hits the protruding portion 50, and the force at that time breaks the lumpy foreign matter into smaller pieces. This makes it easier for foreign matter to fall downward.

Further, when the lumpy foreign matter hits the protruding portion 50, the lumpy foreign matter is suppressed from moving so as to rotate around the drive shaft 4 many times. That is, the protruding portion 50 is a turning suppressing member that suppresses the turning of the massive foreign matter. Further, when a lumpy foreign substance is present between the upper cutting blade 5 and the lower cutting blade 6, it may be difficult to cut with both cutting blades 5 and 6, but in this embodiment, it may be difficult to cut. Since the protruding portion 50 is located between the upper cutting blade 5 and the lower cutting blade 6, the lumpy foreign matter between the upper cutting blade 5 and the lower cutting blade 6 can be crushed by the protruding portion 50. As a result, foreign matter falls downward.

The foreign matter cut by the upper cutting blade 5 and the lower cutting blade 6 and the foreign matter finely crushed by hitting the protrusion 50 fall downward and enter the opening 8b of the fixing plate 8. On the lower side of the fixed plate 8, the rotary blade 9 rotates in the same direction as the cutting blades 5 and 6, and the rotation of the rotary blade 9 exerts a shearing force on the foreign matter that has entered the opening 8b of the fixed plate 8. That is, when foreign matter enters the opening 8b of the fixing plate 8, the foreign matter is sandwiched between the peripheral edge of the opening 8b and the cutting edge of the protruding blade 9b of the rotary blade 9, and at this time, a shearing force acts on the foreign matter. Then the foreign matter is crushed. Since a plurality of openings 8b of the fixing plate 8 are provided, the amount of foreign matter processed per unit time can be increased, and the amount of foreign matter staying inside the casing 3 can be reduced.

Some of the crushed foreign matter directly enters the suction port 73a of the pump housing 71, and some reaches the periphery of the suction port 73a. A guide surface 73b is provided around the suction port 73a, and the foreign matter can be guided to the suction port 73a by the guide surface 73b, so that the foreign matter can be smoothly sucked into the pump housing 71.

Further, the coolant liquid accumulated at the bottom of the tank 100 is sucked into the inside of the pump housing 71 from the communication port 74a formed in the lower wall portion 74 of the pump housing 71 and transferred.

(Action and effect of the embodiment)
As described above, according to the coolant transfer pump 1 according to this embodiment, the protruding portion 50 to which the foreign matter flowing in from the inflow port 30a of the casing 3 hits is provided so as to protrude from the inner peripheral surface of the casing 3. Therefore, the lumpy foreign matter can be crushed by the protrusion 50 to make it smaller. As a result, the lumpy foreign matter is unlikely to remain accumulated inside the casing 3, and can be transferred together with the coolant liquid.

Further, a fixing plate 8 having a plurality of openings 8a, 8a, ... Communicating with the inside of the pump mechanism 7 is provided at the lower part of the casing 3 to shear foreign matter entering the openings 8a, 8a, ... Of the fixing plate 8. Since the rotary blade 9 is provided below the fixing plate 8, the amount of foreign matter processed per unit time can be increased, and the amount of foreign matter staying inside the casing 3 can be reduced.

Further, a suction port 73a that communicates with the openings 8a, 8a, ... Of the fixing plate 8 is provided on the upper part of the pump housing 71, and a guide surface 73b that guides foreign matter toward the suction port 73a around the suction port 73a. Therefore, foreign matter can be smoothly sucked into the pump housing 71, and the amount of foreign matter staying inside the casing 3 can be further reduced.

(Other embodiments)
In the above embodiment, the upper cutting blade 5 and the lower cutting blade 6 are provided, but one of them may be omitted. Further, in the above embodiment, the case where the protruding portion 50 has a plate shape has been described, but the present invention is not limited to this, and although not shown, the protruding portion may be, for example, a rod-shaped protruding portion. Further, a plurality of protruding portions 50 may be provided. When a plurality of protrusions 50 are provided, they may be provided apart from each other in the circumferential direction of the drive shaft 4, or may be provided apart from each other in the axial direction of the drive shaft 4.

The above embodiments are merely exemplary in all respects and should not be construed in a limited way. Furthermore, all modifications and modifications that fall within the equivalent scope of the claims are within the scope of the present invention.

As described above, the coolant transfer pump according to the present invention is suitable for transferring the coolant discharged from the machine tool, for example.

1 Coolant liquid transfer pump 3 Casing 4 Drive shaft 5 Upper cutting blade 6 Lower cutting blade 7 Pump mechanism 8 Fixing plate 8a Opening 9 Rotary blade 30a Inflow port 50 Protruding part 52 Plate-shaped part 73a Suction port 73b Guide surface

Claims (3)

In a coolant transfer pump that transfers a coolant mixed with foreign matter together with the foreign matter.
A drive shaft that extends in the vertical direction,
A casing formed so as to surround the drive shaft and having an inflow port through which the coolant liquid mixed with the foreign matter flows.
A pump mechanism provided at the bottom of the casing and driven by the drive shaft,
A cutting blade provided inside the casing, driven by the drive shaft, and cutting foreign matter flowing in from the inflow port, and
It is provided with a protruding portion that protrudes from the inner peripheral surface of the casing and is arranged so that foreign matter that has flowed in from the inflow port hits the casing .
Inside the casing, upper cutting blades and lower cutting blades, which are arranged at intervals in the vertical direction and are driven by the drive shaft, are provided.
The upper cutting blade and the lower cutting blade each have a blade portion extending outward in the radial direction of the drive shaft.
The protruding portion is provided at a portion separated from the central portion of the inflow port by 90 ° or more in the circumferential direction of the drive shaft, and is arranged between the upper cutting blade and the lower cutting blade in the protruding direction. It has a plate-like portion that extends in the vertical direction and is formed so that the vertical dimension is longer than the dimension.
A pump for transferring coolant liquid , wherein the tip of the plate-shaped portion is closer to the drive shaft than the tip of the blade portion of the upper cutting blade and the tip of the blade portion of the lower cutting blade. .. In the coolant transfer pump according to claim 1,
A fixing plate having a plurality of openings for communicating the inside of the casing and the inside of the pump mechanism is provided at the lower part of the casing.
A coolant transfer pump, characterized in that a rotary blade driven by the drive shaft and shearing foreign matter that has entered the opening of the fixing plate is provided below the fixing plate. In the coolant transfer pump according to claim 2.
The pump mechanism has a pump housing and
The upper part of the pump housing is provided with a suction port communicating with the opening of the fixing plate and a suction port provided around the suction port so as to guide the foreign matter passing through the opening toward the suction port. A coolant transfer pump, characterized in that a guide surface is provided so as to be located lower as it approaches the suction port.

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