JP2018053731A - Pump for transferring coolant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer an agglomerate foreign matter together with coolant to prevent the foreign matter from retaining inside a housing.SOLUTION: A pump for transferring coolant is provided with: a pump mechanism 7 driven by a drive shaft 4 in a lower part of a casing 3; shearing blades 5, 6 driven by the drive shaft 4 and provided inside the casing 3; and a projection part 50 projecting from an inner peripheral surface of the casing 3, whereby the projection part 50 abuts on and crushes an agglomerate foreign matter.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coolant liquid transfer pump that transfers coolant liquid mixed with foreign matter such as cutting waste discharged from a machine tool, and particularly relates to the technical field of a structure including a cutting blade for cutting foreign matter.

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

  The coolant liquid transfer pump disclosed in Patent Document 1 is a pair of a drive shaft that is rotationally driven by an electric motor, a pump mechanism that is coupled to a lower portion of the drive shaft, and a pair that is fixed above the pump mechanism of the drive shaft and cuts foreign matter. Cutting blades, and a rotary blade and a fixed blade provided between the cutting blade and the pump mechanism. The foreign matter guided to the inside of the casing by the guide plate is cut by the rotating cutting blades and is also cut by the rotary blade and the fixed blade disposed below, and then the pump becomes fine. It is transferred with the coolant liquid by the mechanism.

JP 2012-233457 A

  By the way, many foreign matters mixed in the coolant liquid are spiral and have a certain length, and they may enter the inside of the casing in a state of being intertwined into a lump. At this time, in the coolant liquid transfer pump of Patent Document 1, a pair of cutting blades are provided with a vertical interval inside the casing and at a predetermined interval with respect to the inner surface of the casing, A space without cutting blades exists inside the casing. If the foreign matter that has become a lump reaches the space without the cutting blade, the foreign matter remains in the casing without being cut by the cutting blade, and as a result, the foreign matter may not be transferred together with the coolant.

  The present invention has been made in view of such a point, and an object of the present invention is to make it possible to transfer massive foreign substances together with the coolant liquid so as not to remain in the casing.

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

  1st invention is the coolant liquid transfer pump which transfers the coolant liquid which a foreign material mixed with this foreign material, The drive shaft extended in the up-down direction, The coolant liquid which was formed so that the said drive shaft might be enclosed, and the said foreign material was mixed in A casing having an inflow port for inflow, a pump mechanism provided at a lower portion of the casing and driven by the drive shaft, and provided inside the casing, driven by the drive shaft, and introduced from the inflow port It is characterized by comprising cutting blades for cutting 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 flows in from the inflow port hits it.

  According to this configuration, the foreign matter that has flowed 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 lump of 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 protruding portion. It is crushed and becomes smaller. As a result, the foreign matter easily falls downward and can be transferred by the pump mechanism, so that it is difficult for the foreign matter to remain in the casing.

  According to a second invention, in the first invention, a fixed plate having a plurality of openings for communicating the inside of the casing and the inside of the pump mechanism is provided at a lower portion of the casing, and is driven by the drive shaft. A rotary blade that shears the foreign matter that has entered the opening of the fixed plate is provided below the fixed plate.

  According to this configuration, when the foreign matter that has flowed into the casing enters the opening of the fixed plate, it is sheared by the rotation of the rotary blade and becomes smaller. At this time, since there are a plurality of openings of the fixing plate and a large area capable of discharging foreign matter is secured, the foreign matter easily flows into the pump mechanism and the amount of foreign matter processed per unit time is increased. The amount of foreign matter staying inside the casing is reduced.

  In a third aspect based on the second aspect, the pump mechanism has a pump housing, and an upper portion of the pump housing has a suction port communicating with the opening of the fixed plate, and a periphery of the suction port. And a guide surface formed so as to be positioned closer to the suction port so as to guide the foreign matter that has passed through the opening toward the suction port. And

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

  According to a fourth invention, in any one of the first to third inventions, an upper cutting blade and a lower cutting blade that are spaced apart from each other in the vertical direction are provided inside the casing, and the protrusion The portion is arranged between the upper cutting blade and the lower cutting blade.

  That is, a space without a cutting blade is formed between the upper cutting blade and the lower cutting blade, and lump-like foreign matter tends to stay in this space. Since the protrusion is disposed between the blades, the lump-like foreign matter existing between the upper cutting blade and the lower cutting blade hits the protrusion and is crushed and transferred by the pump mechanism.

  A fifth invention is characterized in that, in any one of the first to fourth inventions, the projecting portion is provided in a portion away from the inflow port in a circumferential direction of the drive shaft.

  In other words, the foreign matter that has flowed into the casing from the inlet moves so as to rotate around the drive shaft by the rotation of the cutting blade, but at this time, the protrusion is separated from the inlet in the circumferential direction of the drive shaft. Therefore, it is difficult to become an obstacle when a foreign substance flows in.

  According to a sixth invention, in any one of the first to fifth inventions, the projecting portion has a plate-like portion extending in the vertical direction.

  According to this structure, the lump-like foreign material which exists in the predetermined range of the up-down direction inside a casing hits the plate-shaped part of a protrusion part reliably, and is crushed and becomes small.

  According to the first aspect of the present invention, since the protruding part that the foreign substance flowing in from the inlet of the casing hits is provided so as to protrude from the inner peripheral surface of the casing, the massive foreign substance can be crushed by the protruding part and made small. . As a result, the lump-like foreign matter hardly remains in the casing and can be transferred together with the coolant.

  According to the second invention, the fixed plate having a plurality of openings communicating with the inside of the pump mechanism is provided in the lower portion of the casing, and the rotary blade that shears the foreign matter that has entered the openings of the fixed plate is provided below the fixed plate. Since it is provided, the amount of foreign matter processed per unit time can be increased, and the amount of foreign matter retained in the casing can be reduced.

  According to the third invention, at the top of the pump housing, a suction port that communicates with the opening of the fixed plate is provided, and a guide surface that guides foreign matter toward the suction port is provided around the suction port. Foreign matter is smoothly sucked into the pump housing, and the amount of foreign matter staying in the casing can be further reduced.

  According to the fourth aspect of the invention, since the protruding portion is disposed 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. It can be transferred by the pump mechanism, and the amount of foreign matter staying inside the casing can be further reduced.

  According to the fifth aspect of the present invention, since the protrusion is provided at a portion away from the inlet in the circumferential direction of the drive shaft, the protrusion is unlikely to become an obstacle when the foreign matter flows in, and the foreign matter is smoothly introduced into the casing. Can be allowed to flow into.

  According to the sixth invention, since the projecting portion has the plate-like portion extending in the up-down direction, the lump-like foreign matter existing in the predetermined range in the up-down direction inside the casing can be crushed and reduced. it can.

It is a longitudinal cross-sectional view of the pump for coolant liquid transfer which concerns on embodiment. It is a top view of a fixed board. It is a top view of a rotary blade. It is a side view of a protrusion part. It is a top view of a protrusion part. It is a front view of a protrusion part.

  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 merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a coolant liquid 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 indicated by a virtual line. The used coolant liquid flows into the tank 100 from the left side of FIG. 1, and the coolant liquid that has flowed into the tank 100 is downstream along with foreign substances mixed in the coolant liquid by the coolant liquid transfer pump 1. It is transferred to a filtration device and a centrifugal separator (not shown). The coolant liquid is discharged from, for example, a machine tool (not shown). Accordingly, the foreign matter mixed in the coolant liquid is, for example, chips or cutting waste. The coolant liquid in which the foreign matter is mixed is transferred to the filtration device or the centrifugal separator by the coolant liquid transfer pump 1, and then the foreign material and the coolant solution are separated, and the coolant solution 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 fixed plate 8, and a rotary blade 9. ing. Since the electric motor 2 is a well-known one, detailed description thereof is omitted. The electric motor 2 is provided in the upper part of the coolant liquid transfer pump 1 and is disposed so that the center line extends in a substantially 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 protrudes downward from the output shaft of the electric motor 2. A large-diameter portion 4 a is provided at the top of the drive shaft 4, and an upper step 4 b is formed at the top of the outer peripheral surface of the drive shaft 4 by providing this large-diameter portion 4 a. Further, a small diameter portion 4 c is provided at the lower portion of the drive shaft 4, and a lower step portion 4 d is formed at the lower portion of the outer peripheral surface of the drive shaft 4 by providing this small diameter portion 4 c. Furthermore, a screw shaft portion 4e having a screw groove formed on the outer peripheral surface is provided on the lower end surface of the drive shaft 4 so as to protrude 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 cylindrical member 30. A lower end portion of the electric motor 2 is fixed to the upper plate 31. A support plate 32 that supports the upper end (downstream end) 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 cylindrical member 30. Further, the upper plate 31 is provided with a cylindrical fixed side cover 31 a 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 8 a into which the drive shaft 4 is inserted is formed at the center of the fixed plate 8. Further, around the insertion hole 8a of the fixed plate 8, a plurality of openings 8b, 8b,... That allow the inside of the casing 3 and the inside of the pump mechanism 7 to communicate with each other are formed. These openings 8 b, 8 b,... Are arranged at intervals in the circumferential direction of the fixed plate 8. Each opening 8b has a shape that is long in the radial direction of the fixed plate 8, and the width of the opening becomes wider toward the outside in the radial direction.

  An attachment hole 8 c is formed in the outer peripheral portion of the fixed plate 8. The mounting hole 8c is for fixing the fixing plate 8.

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

  Further, a flushing water passage hole 30 d is formed in the cylindrical member 30 of the casing 3. The flushing water passage hole 30d is located in a portion away from the inlet 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. Thus, the water in the pipe can be introduced into the casing 3. The flushing water passage hole 30d is disposed below the central portion of the casing 3 in the vertical direction. In addition, the flow of water introduced from the flushing water passage hole 30 d matches the rotation direction of the drive shaft 4. Such a flow of water makes it possible to prevent the foreign matter from being retained by being blown away by water pressure when the foreign matter is offset around the casing 3. The coolant liquid 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 in the casing 3 in a state where they are spaced apart from each other in the vertical direction, and are driven by the drive shaft 4 to cut foreign matter flowing in from the inlet 30a. Is. 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 and spaced from each other in the circumferential direction of the drive shaft 4. The tip portions of the blade portions 5a and 5a are cylindrical. It approaches the inner peripheral surface of the shaped member 30. The lower cutting blade 6 is also provided with similar blade portions 6a and 6a.

  A cylindrical upper spacer 10 is provided on the upper part of the upper cutting blade 5. A portion between the large diameter portion 4 a and the small diameter portion 4 c of the drive shaft 4 is inserted into the upper spacer 10. The upper spacer 10 is fitted to the upper step 4b of the drive shaft 4 from below. 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 surrounding 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 drive shaft 4 rotates. It has become. Moreover, the clearance gap between the inner peripheral surface of the shaft cover 11 and the outer peripheral surface of the stationary side cover 31a is set narrow, and it is difficult for the foreign material inside the casing 30 to pass through the clearance. This makes it difficult for foreign matter to enter the bearing (not shown) of the electric motor 2.

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

  A cylindrical intermediate second spacer 13 is provided below the lower cutting blade 6. A portion between the large diameter portion 4 a and the small diameter portion 4 c 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 an interval between the lower cutting blade 6 and the rotary blade 9.

  The rotary blade 9 is driven by the drive shaft 4 to shear foreign matter that has entered the openings 8b, 8b,... Of the fixed plate 8, and is disposed below the fixed plate 8. As shown in FIG. 3, an insertion hole 9 a into which the drive shaft 4 is inserted is formed at the center of the rotary blade 9. The rotary blade 9 is integrally formed with a plurality of projecting blades 9b, 9b, 9b that project in the radial direction. The protruding blades 9 b, 9 b, 9 b rotate along the lower surface of the fixed plate 8. A cylindrical lower spacer 14 is provided below the rotary blade 9. A portion between the large diameter portion 4 a and the small diameter portion 4 c of the drive shaft 4 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 includes an impeller 70 and a pump housing 71 that houses the impeller 70. An insertion hole 70 a into which the small diameter portion 4 c of the drive shaft 4 is inserted is formed at the center of the impeller 70. A nut N is screwed into the screw shaft portion 4 e of the drive shaft 4. By screwing a nut N into the screw shaft 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 fastened in the vertical direction and fixed to the drive shaft 4.

  The drive shaft 4 is provided with a key 41. The key 41 engages 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 connection pipe portion 72a to which the lower end portion (upstream end portion) of the discharge pipe 101 is connected is formed. The coolant liquid in which the foreign matter is mixed 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 73 a that communicates with the opening 8 b of the fixed plate 8 is formed at the center of the upper wall portion 73. Furthermore, 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 positioned downward as it approaches the suction port 73a, and the shape is set so that foreign matter on the guide surface 73b flows toward the suction port 73a by gravity. Further, a groove 73 c is formed in the guide surface 73 b in the upper wall portion 73. The groove 73c extends in the radial direction from the peripheral edge of the suction port 73a.

  A communication port 74 a for communicating the inside of the pump housing 71 with the inside of the tank 100 is formed at the center 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, almost no foreign matter enters 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. . Thereby, pump performance can be improved and the amount of feed per unit time can be increased.

  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 can easily flow radially outward through the blades of the impeller 70.

  As shown in FIG. 1, the casing 3 is provided with a protruding portion 50 that protrudes radially inward from the inner peripheral surface of the cylindrical member 30. The protrusion 50 is disposed so that foreign matter that has flowed in from the inlet 30a of the casing 3 hits it. As shown in FIGS. 4 to 6, the protruding portion 50 has an attachment portion 51 and a plate-like portion 52 integral with the attachment portion 51, and bends one metal plate material at a substantially right angle. It is constituted by. The attachment portion 51 extends in the vertical direction along the inner peripheral surface of the cylindrical member 30. The mounting portion 51 is formed with mounting holes 51a and 51a penetrating in the thickness direction. A fastening member 53 (shown in FIG. 1) made of a bolt or the like is inserted into each mounting hole 51a. The projecting portion 50 can be fixed to the cylindrical member 30 by screwing the fastening member 53 inserted through each mounting hole 51 a into a screw hole formed in the cylindrical member 30.

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

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

(Explanation of operation of coolant liquid 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 inlet 30a through the coolant 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, the drive shaft 4, the upper cutting blade 5, and the lower cutting blade 6 are rotated inside the casing 3, whereby a flow around the driving shaft 4 is formed inside the casing 3. This flow causes foreign matter to flow around the drive shaft 4. At this time, the foreign matter may be in a lump shape, and the lump-like 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 massive foreign matter is crushed and reduced by the force at that time. Thereby, it becomes easy for a foreign material to fall below.

  Further, when the lump-like foreign matter hits the protruding portion 50, the lump-like foreign matter is prevented from moving around the drive shaft 4 so as to rotate many times. In other words, the protrusion 50 is a turning suppression member that suppresses turning of the massive foreign matter. Moreover, when a lump-like foreign material exists between the upper cutting blade 5 and the lower cutting blade 6, it may be difficult to cut with both of the cutting blades 5, 6. In this embodiment, Since the protruding portion 50 is located between the upper cutting blade 5 and the lower cutting blade 6, a lump of 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, the foreign material 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 protruding portion 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 a shearing force acts on the foreign matter entering the opening 8 b of the fixed plate 8 by the rotation of the rotary blade 9. That is, when foreign matter enters the opening 8b of the fixed plate 8, the foreign matter is sandwiched between the peripheral edge of the opening 8b and the tip of the protruding blade 9b of the rotary blade 9, and at this time, shear force acts on the foreign matter. As a result, 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.

  The crushed foreign substances include those that directly enter the suction port 73a of the pump housing 71 and those that reach the periphery of the suction port 73a. A guide surface 73b is provided around the suction port 73a. The foreign material can be guided to the suction port 73a by the guide surface 73b, so that the foreign material is smoothly sucked into the pump housing 71.

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

(Effect of embodiment)
As described above, according to the coolant liquid transfer pump 1 according to this embodiment, the protruding portion 50 against which the foreign matter flowing in from the inlet 30 a of the casing 3 hits is provided so as to protrude from the inner peripheral surface of the casing 3. Therefore, a lump-like foreign material can be crushed by the protrusion part 50 and made small. Thereby, a lump-like foreign material does not remain in the casing 3 and can be transferred together with the coolant.

  Further, a fixing plate 8 having a plurality of openings 8a, 8a,... Communicating with the inside of the pump mechanism 7 is provided in the lower part of the casing 3, and the foreign matter that has entered the openings 8a, 8a,. Since the rotary blade 9 is provided below the fixed plate 8, the amount of foreign matter processed per unit time can be increased, and the amount of foreign matter retained in 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 in 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. Since the foreign matter is smoothly sucked into the pump housing 71, the amount of the foreign matter staying in 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. Moreover, although the case where the protrusion part 50 was plate shape was demonstrated in the said embodiment, it is not restricted to this, For example, the protrusion part which protrudes in rod shape may be sufficient. A plurality of protrusions 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-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

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

DESCRIPTION OF SYMBOLS 1 Coolant liquid transfer pump 3 Casing 4 Drive shaft 5 Upper cutting blade 6 Lower cutting blade 7 Pump mechanism 8 Fixed plate 8a Opening portion 9 Rotary blade 30a Inlet 50 Protruding portion 52 Plate-like portion 73a Suction port 73b Guide surface

Claims (6)

In the coolant liquid transfer pump for transferring the coolant liquid mixed with the foreign material together with the foreign material,
A drive shaft extending vertically,
A casing that is formed so as to surround the drive shaft and has an inflow port through which the coolant liquid mixed with the foreign matter is introduced;
A pump mechanism provided at a lower portion 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;
A coolant liquid transfer pump, comprising: a protruding portion that protrudes from an inner peripheral surface of the casing and is disposed so that a foreign substance that flows in from the inlet port contacts the casing. In the coolant liquid 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 in the lower part of the casing,
A coolant liquid transfer pump, characterized in that a rotary blade driven by the drive shaft and shearing the foreign matter entering the opening of the fixed plate is provided below the fixed plate. The coolant liquid transfer pump according to claim 2,
The pump mechanism has a pump housing,
An upper portion of the pump housing is provided with a suction port communicating with the opening of the fixing plate, and around the suction port so that the foreign matter passing through the opening is guided toward the suction port. And a coolant liquid transfer pump, characterized by being provided with a guide surface formed so as to be positioned at a lower position as it approaches the suction port. In the coolant liquid transfer pump according to any one of claims 1 to 3,
Inside the casing is provided with an upper cutting blade and a lower cutting blade that are spaced apart from each other in the vertical direction,
The coolant liquid transfer pump, wherein the protrusion is disposed between the upper cutting blade and the lower cutting blade. In the coolant liquid transfer pump according to any one of claims 1 to 4,
The coolant liquid transfer pump, wherein the protrusion is provided in a portion away from the inflow port in the circumferential direction of the drive shaft. In the coolant liquid transfer pump according to any one of claims 1 to 5,
The projecting portion has a plate-like portion extending in the vertical direction.

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