Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
  • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
  • F04B43/04—Pumps having electric drive
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/22—Arrangements for enabling ready assembly or disassembly

Definitions

• This case relates to a pump and a motorized pump that has a motor that drives the pump.
• Pumps are driven by a driving device such as a motor to discharge a fluid.
• a driving device such as a motor to discharge a fluid.
• Known methods for fixing a pump to a motor include a method in which a claw extending from the motor engages with the pump (e.g., Patent Document 1), and a method in which the pump is placed relative to the motor and then fixed by crimping a connecting piece extending from the motor (e.g., Patent Document 2).
• the pump and motorized pump of this case were devised in consideration of these problems, and one of the objects is to easily fix the pump to the motor and to improve the performance of the pump.
• this object is not limited to this, and another object of this case is to achieve effects that cannot be obtained by conventional technology, which are derived from the various configurations shown in the description of the embodiment of the invention described below.
• the disclosed pump and motorized pump can be realized as the aspects (application examples) disclosed below, which solve at least part of the above problems.
• Aspects 2 to 9 are all aspects that can be selected as appropriate and are all aspects that can be omitted. None of Aspects 2 to 9 discloses an essential aspect or configuration for this case.
• the disclosed pump is a pump that converts the rotational motion of a motor shaft into reciprocating motion in the axial direction of the shaft to discharge a fluid, and includes a pump housing having a base portion that is arranged to face the motor housing through which the shaft is inserted in the axial direction.
• the pump housing is provided with a convex portion that protrudes from the base portion in the axial direction and is press-fitted into a hole formed in the housing, and a claw portion that engages with a concave portion formed in the housing when the convex portion is press-fitted into the hole.
• the pump housing has a wall portion extending from the base portion toward the housing.
• the claw portion protrudes from the wall portion toward the inside in the radial direction of the shaft.
• the pump housing has at least two auxiliary wall portions provided across the wall portion and the base portion.
• the at least two auxiliary wall portions are provided at positions sandwiching the claw portion in the extension direction of the wall portion as viewed from the axial direction, and are in surface contact along the corner shape of the housing.
• the wall portion is provided in a plurality of locations spaced apart from each other so as to sandwich the housing.
• the pump housing has a connection portion that connects the base portion and the claw portion, and a protrusion portion that protrudes from the base portion.
• the protrusion portion is disposed at a position separated from the connection portion, and the protrusion portion abuts against the housing in a state where it is press-fitted and fixed into the hole portion.
• Aspect 6 In any of the aspects including Aspect 5 above, it is preferable that the protrusion is provided in the vicinity of the shaft.
• the disclosed motorized pump comprises a pump according to any one of aspects 1 to 9 above, and a motor that drives the pump.
• the disclosed pump and pump with motor allow the pump to be easily fixed to the motor, and the performance of the pump can be improved.
• FIG. 1 is an exploded perspective view of a pump with a motor to which the pump of the embodiment is applied;
• FIG. 2 is an axial cross-sectional view of a motorized pump to which the pump of the embodiment is applied, taken along a first diameter line D in FIG. 1 and seen from the direction of arrow A in FIG. 1.
• 3 is an axial cross-sectional view of a bottom body of a pump housing provided in the pump of FIG. 2.
• FIG. 4 is a plan view of the bottom body of the pump housing in FIG. 3 as viewed from the motor side.
• FIG. 4 is a perspective view of the bottom of the pump housing of FIG. 3 .
• FIG. 8 is an axial cross-sectional view of a main part of a pump housing provided in a modified pump (an axial cross-sectional view taken along a first diameter line D in FIG. 7 ).
• FIG. FIG. 7 is a plan view of the pump housing of FIG. 6 as viewed from the motor side. 7 is an enlarged view of part B in FIG. 6, showing the pump housing in FIG. 6 attached to the housing of the motor.
• the pump of the embodiment is a reciprocating positive displacement pump that converts the rotational motion of the motor shaft into a reciprocating motion in the axial direction of the shaft to discharge a fluid.
• the motor-equipped pump of the embodiment includes the pump and a motor that drives the pump, and the pump and the motor are attached (fixed).
• the pump of the embodiment includes a pump housing.
• the pump housing has a base portion that is arranged axially opposite the motor housing through which the shaft is inserted.
• the pump housing is also provided with a protrusion that protrudes in the axial direction from the base portion and a claw portion.
• the protrusion is a portion that is press-fitted and fixed into a hole formed in the housing.
• the claw portion is a portion that engages with a recess formed in the housing when the protrusion is press-fitted and fixed into the hole.
• the pump of the embodiment is characterized in that, by providing such a protrusion and a claw portion, the pump can be easily fixed to the motor, and the performance of the reciprocating positive displacement pump is improved by suppressing axial rattle when attached to the motor.
• Fig. 1 is an exploded perspective view of a motorized pump 1 to which a pump 3 of this embodiment is applied
• Fig. 2 is an axial cross-sectional view of the motorized pump 1 (a view of the motorized pump 1 cut at a first diameter line D described below in Fig. 1 and viewed from the direction of arrow A in Fig. 1).
• the motorized pump 1 includes a pump 3 and a motor 2.
• the pump 3 is attached to the motor 2 in a first direction, which is the axial direction of a shaft 4 of the motor 2.
• the pump 3 is a reciprocating positive displacement pump that is driven by the motor 2 and converts the rotational motion of the shaft 4 into reciprocating motion in the axial direction of the shaft 4 to discharge a fluid.
• the motor 2 is, for example, an inner rotor type motor as shown in FIG. 2, and is configured by incorporating a rotor 5 that rotates integrally with the shaft 4 and a stator 6 located radially outward of the rotor 5 into a bottomed cylindrical housing 20.
• An end bell 7 serving as a lid member may be combined with the opening side (lower side in the figure) of the housing 20.
• the shaft 4 is rotatably supported relative to the housing 20 by a bearing 8 held in the housing 20.
• the end bell 7 may also hold a bearing that rotatably supports the shaft 4.
• the housing 20 is a rigid (e.g., metal) member that forms the outer shell of the motor 2, and has a side portion 21 and a bottom portion 22.
• the side portion 21 is the portion that forms the cylindrical portion of the bottomed cylindrical housing 20, and forms a space that houses the rotor 5 and the stator 6.
• the side portion 21 is cylindrical with a substantially uniform diameter in the axial direction.
• the bottom surface portion 22 is a portion that forms the bottom of the bottomed cylindrical housing 20 in the first direction from the side surface portion 21.
• the bottom surface portion 22 has a uniform thickness in the axial direction and is flat and expanded in a direction perpendicular to the axial direction.
• the bottom surface portion 22 in this embodiment is disk-shaped when viewed from the axial direction, and a circular center hole that is concentric with the axis C of the shaft 4 is formed in the center.
• the shaft 4 is inserted into the center hole of the bottom surface portion 22.
• the bottom surface portion 22 may be provided with a bearing accommodating portion 24 that forms the center hole and forms an accommodating space for the bearing 8, so as to be convex toward the first direction side.
• the outer peripheral surface 23a of the corner portion 23 that connects the side surface portion 21 and the bottom surface portion 22 may be rounded (R) so as to smoothly connect the outer peripheral surface 21a of the side surface portion 21 and the outer end surface 22a of the bottom surface portion 22 that faces the first direction, as shown in FIG. 2.
• the housing 20 is provided with the above-mentioned hole 25 and recess 26.
• the hole 25 is provided in the bottom surface 22, and the recess 26 is provided in the side surface 21.
• the hole 25 is a portion recessed from the outer end surface 22a of the bottom surface 22 in the second axial direction, and forms a space (hole, recess) into which a protrusion 39 of the pump 3, which will be described later, is pressed in.
• the hole 25 in this embodiment is provided so as to penetrate the bottom surface 22 in the axial direction, and forms a circular through hole when viewed from the axial direction, as shown in FIG. 1.
• the number of holes 25 provided in the bottom surface portion 22 may be at least one, but is preferably two or more.
• two holes 25 are provided on either side of the shaft 4. More specifically, the two holes 25 are provided on a first diameter line D perpendicular to the axis C of the shaft 4, on either side of the shaft 4 (180 degrees offset in the circumferential direction).
• the holes 25 may not only function to press-fit and fix the protrusions 39 of the pump 3, but may also function as positioning holes during the manufacture of the motor 2. In other words, in this case, rather than forming holes 25 exclusively for press-fitting and fixing, the holes that play the role of positioning during the manufacture of the motor 2 may be used as a part for fixing the pump 3.
• the recess 26 is a portion recessed radially inward from the outer circumferential surface 21a of the side portion 21, and forms a space (hole, recess) into which the claw portion 40 of the pump 3, described later, fits.
• the recess 26 not only has the function of engaging with the claw portion 40 of the pump 3, but also functions as a protrusion for determining the axial position of a magnet (not shown) provided on the stator 6.
• the pump 3 utilizes the protrusion for positioning the magnet as the recess 26 for fixing the pump 3.
• the recess 26 is provided so as to recess a part of the side surface portion 21 on the first direction side of the stator 6 without penetrating the side surface portion 21 in the radial direction, and forms a long and narrow recess (concave) extending in the circumferential direction as shown in FIG. 1.
• the radially inner part of the recess 26 protrudes radially inward beyond the inner circumferential surface 21b (inner surface) of the side surface portion 21. This part serves as a protrusion for positioning the magnet.
• the number of recesses 26 provided in the side portion 21 may be at least one, but is preferably two or more.
• four recesses 26 are provided. Two of the four recesses 26 are provided on the first diameter line D on which the hole portion 25 is provided, sandwiching the shaft 4. The remaining two recesses 26 are provided at positions spaced apart in the counterclockwise direction from the first direction from the first two recesses 26, as shown in FIG. 1.
• the latter two recesses 26 are provided, for example, on the second diameter line E, which is a diameter line perpendicular to the axis C and out of phase with the first diameter line D, sandwiching the shaft 4.
• a pump chamber 3A partitioned by the pump housing 30 and the diaphragm portion 12a, and a suction chamber 3B and a discharge chamber 3C which communicate with the pump chamber 3A.
• a valve body provided in the suction chamber 3B opens, and air is taken into the pump chamber 3A.
• a valve body provided in the discharge chamber 3C opens, and the air in the pump chamber 3A is sent to the discharge chamber 3C and discharged from the discharge port 3D.
• the drive mechanism 11 has, for example, a support part 13 that is fixed to the shaft 4 so as not to rotate relative to the shaft 4, and a driver 14 that is supported by the support part 13.
• the support part 13 has an axial hole that extends at an angle relative to the shaft 4 at a position eccentric to the shaft 4.
• the driver 14 has a shaft part 14a that fits into the axial hole, and an arm part 14b that protrudes radially outward from the shaft part 14a.
• the radially inner portion of the base portion 35 has a central hole through which the shaft 4 passes and into which the bearing housing portion 24 fits when mounted.
• a through hole 35h is provided in the arcuate end edge 35j of the base portion 35 at a position that overlaps with the claw portion 40 when viewed from the axial direction.
• the tubular portion 36 is a portion that forms the tubular portion of the bottom body 31, which is cylindrical and has a bottom, and extends in a first direction from the periphery of the bottom body 31 as shown in FIG. 3 to form a space that accommodates the drive mechanism 11. Since the base portion 35 in this embodiment is oval-shaped, the tubular portion 36 is also oval-shaped when viewed from the axial direction.
• the outer peripheral surface of the tubular portion 36 may be provided with a protrusion for engaging with the lid body 34, as shown in FIG. 5.
• the pump housing 30 is integrated with the lid body 34 by engaging the protrusion provided on the tubular portion 36 with the first intermediate body 32 and the second intermediate body 33 sandwiched between the bottom body 31 and the lid body 34.
• the wall portion 37 is a portion extending from the base portion 35 in the second direction.
• a plurality of wall portions 37 are provided spaced apart from each other to sandwich the housing 20. More specifically, as shown in FIG. 4, the two wall portions 37 extend in the second direction from each of the two arcuate edges 35j, and as shown in FIG. 2, sandwich the side portion 21 of the housing 20 in the attached state.
• the circumferential length of each arcuate edge 35j and the circumferential length of the wall portion 37 extending from that arcuate edge 35j are set, for example, to be equal to each other.
• the wall portion 37 is provided over the entire area of the arc edge 35j of the base portion 35 so as to straddle the first diameter line D and the second diameter line E, and extends in the circumferential direction. Also, as shown in FIG. 2, the wall portion 37 is formed so that in the mounted state, the wall portion 37 is in surface contact with the outer circumferential surface 21a of the side portion 21 of the housing 20 along the shape of the side portion 21. The wall portion 37 is formed so that its inner wall surface 37a extends on the circumference of a virtual circle having a diameter approximately equal to the outer diameter of the side portion 21 of the motor 2 when viewed from the axial direction.
• the circumferential length of the arc edge 35j and the circumferential length of the wall portion 37 may be different. Also, the circumferential length of the wall portion 37 on the first direction side may be different from the circumferential length on the second direction side. For example, the wall portion 37 may have a shape in which the circumferential length becomes shorter toward the second direction.
• the auxiliary wall portion 38 is a portion that reinforces the wall portion 37 and suppresses rattling of the pump 3, and is provided across the base portion 35 and the wall portion 37. More specifically, as shown in Figures 3 to 5, the auxiliary wall portion 38 is provided across the base surface 35a of the base portion 35 and the inner wall surface 37a of the wall portion 37. In this embodiment, the auxiliary wall portion 38 also has the function of preventing sound leakage of the operating sounds of the parts (e.g., the drive mechanism 11 and the diaphragm 12) housed within the pump housing 30.
• the auxiliary wall portion 38 is provided with an auxiliary surface 38a that connects the base surface 35a of the base portion 35 and the inner wall surface 37a of the wall portion 37, and faces radially inward in the second direction.
• the auxiliary surface 38a is rounded (R) approximately the same as the outer peripheral surface 23a of the corner portion 23 so as to follow the shape of the corner portion 23 of the motor 2 when mounted and to come into surface contact with the outer peripheral surface 23a of the corner portion 23.
• At least two auxiliary wall portions 38 are provided on each wall portion 37. Furthermore, as shown in FIG. 4, the two auxiliary wall portions 38 provided on each wall portion 37 are provided at positions sandwiching the claw portion 40 in the extension direction of the wall portion 37 as viewed from the axial direction, that is, at positions sandwiching the first diameter line D and the second diameter line E in the extension direction. In this embodiment, the two auxiliary wall portions 38 provided on each wall portion 37 are disposed at both circumferential ends of each wall portion 37.
• the protrusion 39 is a portion that protrudes from the base surface 35a of the base portion 35 toward the second direction, and is provided at a position that overlaps with the hole portion 25 of the housing 20 in the attached state.
• the protrusion 39 is columnar in shape and has an outer shape that allows it to be press-fitted into the hole portion 25 of the housing 20, and is press-fit and fixed into the hole portion 25 of the housing 20 in the attached state. This determines the axial position of the pump 3.
• the protrusion 39 is cross-shaped when viewed from the axial direction.
• the number of protrusions 39 provided on the bottom body 31 should be at least one, but is preferably two or more.
• the number of protrusions 39 is the same as the number of holes 25 in the housing 20, i.e., two. In other words, two holes 25 and two protrusions 39 are provided.
• the two protrusions 39 are provided on the first diameter line D, sandwiching the axis C.
• the claw portion 40 is a portion that engages with the recess 26 of the housing 20 when the protrusion 39 is press-fitted and fixed in the hole 25 of the housing 20, i.e., in the attached state.
• the claw portion 40 protrudes radially inward from the tip (end portion on the second direction side) of the wall portion 37. Therefore, the wall portion 37 can also be said to be a portion (connection portion) that connects the base portion 35 and the claw portion 40.
• the claw portion 40 forms a circumferentially elongated protrusion that corresponds to the shape of the recess of the above-mentioned recess 26.
• the number of claw portions 40 provided on the bottom body 31 may be at least one, but is preferably two or more. In this embodiment, as shown in FIG. 4, the number of claw portions 40 is the same as the number of recesses 26 of the housing 20, i.e., four. In other words, four recesses 26 and four claw portions 40 are provided. Of the four claw portions 40, two claw portions 40 are provided on the first diameter line D, sandwiching the axis C. The remaining two claw portions 40 are provided on the second diameter line E, sandwiching the axis C. One claw portion 40 located on the first diameter line D and one claw portion 40 located on the second diameter line E are protruded from each of the two wall portions 37.
• the pump housing 30 is provided with a protrusion 39 which is press-fitted and fixed in the hole 25, and a claw portion 40 which engages with the recess 26.
• the protrusion 39 is provided to protrude in the axial direction from the base portion 35 of the pump housing 30, and the claw portion 40 engages with the recess 26 in a state in which the protrusion 39 is press-fitted and fixed in the hole 25.
• the pump 3 is a reciprocating positive displacement pump that converts the rotational motion of the shaft 4 of the motor 2 into reciprocating motion in the axial direction of the shaft 4 to discharge fluid.
• axial wobble of the pump 3 relative to the motor 2 can affect the axial reciprocating motion of the pump 3.
• the protrusion 39 is press-fitted into the hole 25, eliminating wobble (axial wobble) that can occur with snap-fit fixing using the claws 40 alone, and also achieving axial positioning. This improves pump performance.
• the portions 39, 40 for fixing the pump 3 are provided so as to protrude from the pump housing 30.
• the motor 2 is not required to have any protrusions or convex portions for fixing the pump 3 to its housing 20.
• the pump 3 does not require the motor 2 to have functions (protrusions) that are unnecessary for the motor 2, thereby improving the manufacturability of the motor 2 alone.
• the existing hole that serves as the positioning role during the manufacture of the motor 2 as the hole portion 25 and the existing convex portion for positioning the magnet as the concave portion 26, versatility can be improved.
• the multiple wall portions 37 are spaced apart from one another so as to sandwich the housing 20. In this way, by spaced apart from one another, the wall portions 37 are easily deformed when the claw portions 40 are snap-fitted, and therefore chipping or breaking of the claw portions 40 can be prevented.
• the engagement of the claw portion 40 with the recess 26 can be released without disassembling the motor 2 or the pump 3.
• the pump 3 can be removed from the motor 2 without the need for a process of disassembling the motor 2 or the pump 3. This improves the product quality and versatility of both the pump 3 and the motor 2.
• the pump housing 30 is made of an elastic body, and the housing 20 is made of a rigid body.
• the pump housing 30 is formed of an elastic body having a higher elasticity than the housing 20, which allows elastic deformation of the pump housing 30 when the claw portion 40 is snap-fitted, thereby preventing chipping or breaking of the claw portion 40.
• the housing 20 is formed of a rigid body having a higher rigidity than the pump housing 30, which allows the protrusion 39 to be more firmly pressed into the hole portion 25.
• the pump 3' of the modified example differs from the pump 3 of the above embodiment mainly in the following points.
• the pump housing 30' is provided with a protrusion 42.
• the pump housing 30' is provided with two claws 40 instead of four.
• the pump housing 30' is provided with two connection pieces 41 (connection portions) instead of the wall portion 37.
• the base portion 35' has a circular outer shape.
• the protrusion 42 protrudes from the base 35' and is a portion that abuts against the outer end surface 22a of the housing 20 in the attached state, and is located at a position spaced apart from the connecting piece 41.
• the protrusion 42 protrudes slightly in the second direction from the base surface 35a' of the base 35'.
• the protrusion 42 is also located at a position spaced apart from the connecting piece 41, near the central hole in the base 35' through which the shaft 4 is inserted, in other words, near the shaft 4.
• protrusion 42 forms a ring shape going around the central hole when viewed in the axial direction near the central hole.
• the amount of protrusion 42 protruding from base surface 35a' is set to be much smaller than the amount of protrusion 39 protruding from base surface 35a' so as not to impede the press-fitting of protrusion 39 into hole 25.
• the modified pump 3' is just one example, and is not limited to the one shown in Figures 6 to 8.
• the position at which the protrusion 42 is provided is not limited to the above-mentioned position, as long as it is at least separated from the connection piece 41. However, from the viewpoint of promoting the above-mentioned deformation of the base portion 35' and the connection piece 41, it is preferable that the protrusion 42 is provided at a position farther away from the connection piece 41.
• the shape of the housing 20 of the motor 2 does not have to be cylindrical, and the shape of the pump housings 30, 30' of the pumps 3, 3' does not have to be oval or circular.
• the housing 20 does not have to be made of a rigid body, and the pump housings 30, 30' do not have to be made of an elastic body.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Details Of Reciprocating Pumps (AREA)
• Compressor (AREA)

Priority Applications (5)

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ID=93265377

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Citations (2)

• 2024
  • 2024-01-12 DE DE112024000029.0T patent/DE112024000029T5/de active Pending
  • 2024-01-12 WO PCT/JP2024/000581 patent/WO2025150177A1/ja active Pending
  • 2024-01-12 JP JP2024543502A patent/JP7603197B1/ja active Active
  • 2024-01-12 CN CN202480001901.4A patent/CN118900954A/zh active Pending

Patent Citations (2)

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