Pumps and pumps with motors

Abstract

A pump (3), which converts the rotational motion of a shaft (4) of a motor (2) into a reciprocating motion in the axial direction of the shaft (4) to discharge a fluid, includes a pump housing (30) having a base portion (35) disposed axially opposite a housing (20) of the motor (2) through which the shaft (4) is inserted. The pump housing (30) is provided with a protrusion (39) which protrudes in the axial direction from the base portion (35) and is press-fitted and fixed in a hole portion (25) formed in the housing (20), and a claw portion (40) which engages with a recess (26) formed in the housing (20) when the protrusion (39) is press-fitted and fixed in the hole portion (25).

Description

[Technical field]

[0001] The present case relates to a pump and a motorized pump including a motor for driving the pump. [Background technology]

[0002] A pump is driven by 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 is engaged with the pump (e.g., Patent Document 1), and a method in which the pump is placed relative to the motor and then a connecting piece extending from the motor is crimped to fix the pump to the motor (e.g., Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-180336 A [Patent Document 2] Patent No. 6876323 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the method of engaging a claw portion with the pump as in Patent Document 1, it is difficult to sufficiently suppress rattling of the pump relative to the motor (especially rattling in the axial direction). In particular, in a pump that converts the rotational motion of the motor shaft into reciprocating motion in the axial direction to discharge a fluid, axial rattling of the pump relative to the motor can affect the reciprocating motion in the axial direction of the pump and reduce the pump performance. On the other hand, in the method of fixing the pump to the motor by crimping as in Patent Document 2, although it is expected to suppress rattling of the pump relative to the motor, it is necessary to perform crimping after placing the pump on the motor. For this reason, there is room for improvement in terms of facilitating the fixing of the pump to the motor.

[0005] The pump and motorized pump of the present invention have been devised in view of the above problems, and one of the objects of the present invention is to easily fix the pump to the motor and to improve the performance of the pump. However, the present invention is not limited to this object. Another object of the present invention is to achieve effects and advantages that cannot be obtained by the conventional technology, which are derived from the configurations shown in the below-mentioned description of the preferred embodiment of the present invention. [Means for solving the problem]

[0006] The disclosed pump and motorized pump can be realized as the following disclosed aspects (application examples), which solve at least part of the above problems. ,4~7 Each of the above may be selected as an additional option, and each of the above may be omitted. ,4~7 None of these disclose aspects or configurations essential to the present invention.

[0007] Aspect 1. Disclosure First The pump discharges a fluid by converting the rotational motion of a motor shaft into a reciprocating motion in the axial direction of the shaft, and includes a pump housing having a base portion disposed opposite in the axial direction to a housing of the motor through which the shaft is inserted. The pump housing is provided with a convex portion protruding in the axial direction from the base portion and press-fitted into a hole formed in the housing, and a claw portion that engages with a concave portion formed in the housing with the convex portion press-fitted into the hole. The pump housing has a wall portion extending from the base portion toward the housing, and at least two auxiliary wall portions provided across the wall portion and the base portion. The claw portion protrudes from the wall portion toward the inside in the radial direction of the shaft. The at least two auxiliary wall portions are provided at positions sandwiching the claw portion in the extending direction of the wall portion as viewed from the axial direction, and are in surface contact with the housing along the corner shape.

[0010] Aspects 2 The above aspects 1 In the aspect including the above, it is preferable that a plurality of the wall portions are provided spaced apart from each other so as to sandwich the housing.

[0011] Aspects 3 . The second disclosed pump is a pump that discharges a fluid by converting a rotational motion of a motor shaft into a reciprocating motion in the axial direction of the shaft, and includes a pump housing having a base portion that is arranged to face the motor housing in the axial direction through which the shaft is inserted. 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 connection portion that connects the base portion and the claw portion, and a protrusion that protrudes from the base portion. 。The protrusion is disposed at a position separated from the connection portion, and the protrusion abuts against the housing in a state where the protrusion is press-fitted and fixed into the hole. do.

[0012] Aspects 4 The above aspects 3 In the aspect including the above, it is preferable that the protrusion is provided in the vicinity of the shaft. Aspects 5 The above aspects 4 In the above aspect, it is preferable that the pump housing is provided with two of the claws arranged opposite to each other with the shaft in between. In this case, it is preferable that the protrusion is provided on a line connecting the two claws and a line perpendicular to the axis of the shaft.

[0013] Aspects 6 .Aspect 1 above Or aspect 3 In the aspect including the above, it is preferable that the pump housing is made of an elastic material and the housing is made of a rigid material. Aspects 7 .Aspect 1 above Or aspect 3 In the aspect including the above, it is preferable that at least two of the holes and the protrusions are provided, and at least two of the recesses and the claws are provided.

[0014] Aspects 8 The disclosed motorized pump is as described above in the first to fifth aspects. 7 and a motor that drives the pump. Effect of the Invention

[0015] According to the disclosed pump and motorized pump, the pump can be easily fixed to the motor and the performance of the pump can be improved. [Brief description of the drawings]

[0016] [Figure 1] 1 is an exploded perspective view of a pump with a motor to which the pump of the embodiment is applied; [Diagram 2] 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. [Diagram 3] 3 is an axial cross-sectional view of a bottom body of a pump housing included in the pump of FIG. 2. [Figure 4] 4 is a plan view of the bottom body of the pump housing in FIG. 3 as viewed from the motor side. [Diagram 5] FIG. 4 is a perspective view of the bottom of the pump housing of FIG. 3. [Figure 6] 8 is an axial cross-sectional view of a main part of a pump housing included in a pump of a modified example (an axial cross-sectional view taken along a first diameter line D in FIG. 7). FIG. [Figure 7] FIG. 7 is a plan view of the pump housing in FIG. 6, as viewed from the motor side. [Figure 8] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] A pump and a motorized pump as embodiments will be described with reference to the drawings. The embodiments described below are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly described in the following embodiments. Each configuration of the present embodiment can be modified in various ways without departing from the spirit of the present embodiment.

[0018] The pump of the embodiment is a reciprocating positive displacement pump that converts the rotational motion of a motor shaft into a reciprocating motion in the axial direction of the shaft to discharge a fluid. The motorized 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 to the housing of the motor 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 including such a protrusion and a claw portion, the pump can be easily fixed to the motor, and axial rattle when attached to the motor is suppressed, thereby improving the performance of the reciprocating positive displacement pump.

[0019] [1. Configuration] FIG. 1 is an exploded perspective view of a motorized pump 1 to which a pump 3 of this embodiment is applied, and 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). As shown in FIGS. 1 and 2, 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. Hereinafter, the axial direction in which the pump 3 is attached to the motor 2 will be referred to as the "first direction", and the axial direction opposite to the first direction will be referred to as the second direction. 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.

[0020] 2, the motor 2 is an inner rotor type motor, for example, and is configured by incorporating a rotor 5 that rotates integrally with a 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 cover 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. Although not shown in the figure, the end bell 7 may also hold a bearing that rotatably supports the shaft 4.

[0021] The housing 20 is a rigid (e.g., metal) member that forms the outer periphery of the motor 2, and has a side portion 21 and a bottom portion 22. The side portion 21 is a portion that forms the tubular portion of the housing 20 that has a bottomed cylindrical shape, and forms a space that houses the rotor 5 and the stator 6. For example, as shown in Fig. 1, the side portion 21 is cylindrical in shape with a substantially uniform diameter in the axial direction.

[0022] 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. For example, as shown in FIG. 2, the bottom surface portion 22 has a flat plate shape that has a uniform thickness in the axial direction and is expanded in a direction perpendicular to the axial direction. As shown in FIG. 1, 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 through 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.

[0023] The housing 20 is provided with the above-mentioned hole portion 25 and recess portion 26. In this embodiment, the hole portion 25 is provided in the bottom surface portion 22, and the recess portion 26 is provided in the side surface portion 21. The hole portion 25 is a portion recessed from the outer end surface 22a of the bottom surface portion 22 in the second axial direction, and forms a space (hole, recess) into which a protrusion portion 39 of the pump 3, which will be described later, is press-fitted. As shown in Fig. 2, the hole portion 25 in this embodiment is provided so as to penetrate the bottom surface portion 22 in the axial direction, and forms a circular through-hole when viewed from the axial direction, as shown in Fig. 1.

[0024] The number of holes 25 provided in the bottom surface portion 22 may be at least one, but is preferably two or more. Here, 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 (shifted by 180 degrees in the circumferential direction). Note that the holes 25 may have not only a function of press-fitting and fixing the protrusions 39 of the pump 3, but also a function as a positioning hole during manufacture of the motor 2. In other words, in this case, instead of forming holes 25 exclusively for press-fitting and fixing, the holes that play a role in positioning during manufacture of the motor 2 may be used as a portion for fixing the pump 3.

[0025] 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 a claw portion 40 of the pump 3, which will be described later, fits. In this embodiment, the recess 26 not only has a function of engaging with the claw portion 40 of the pump 3, but also a function as a protrusion for determining the axial position of a magnet (not shown) provided on the stator 6. In other words, the pump 3 utilizes the protrusion for positioning the magnet as the recess 26 for fixing the pump 3.

[0026] For example, as shown in Fig. 2, recess 26 is provided so as to recess a part of side surface portion 21 without penetrating side surface portion 21 in the radial direction on the first direction side of stator 6, and forms a long and narrow recess (concave) extending in the circumferential direction as shown in Fig. 1. As shown in Fig. 2, a radially inner portion of recess 26 protrudes radially inward beyond inner circumferential surface 21b (inner surface) of side surface portion 21. This portion serves as a protrusion for positioning the magnet.

[0027] The number of recesses 26 provided in the side surface portion 21 may be at least one, but is preferably two or more. Here, 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 therebetween. 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 a second diameter line E that is a diameter line perpendicular to the axis C and out of phase with the first diameter line D, sandwiching the shaft 4 therebetween.

[0028] As described above, the pump 3 is a reciprocating positive displacement pump. Here, as shown in Fig. 2, a diaphragm pump is illustrated as the pump 3. The pump 3 is configured by incorporating, in a pump housing 30, a drive mechanism 11 that converts the rotational motion of the shaft 4 into reciprocating motion in the axial direction, and a diaphragm 12 having a diaphragm portion 12a whose volume increases and decreases in response to the reciprocating motion of the drive mechanism 11.

[0029] A pump chamber 3A, which is 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, are formed within the pump housing 30. When the volume of the pump chamber 3A increases, a valve provided in the suction chamber 3B opens, and air is taken into the pump chamber 3A. When the volume of the pump chamber 3A decreases, a valve provided in the discharge chamber 3C opens, and the air within the pump chamber 3A is sent to the discharge chamber 3C and discharged from the discharge port 3D.

[0030] The diaphragm 12 is a component formed of a flexible material (e.g., rubber), and has a cup-shaped diaphragm portion 12a that forms the pump chamber 3A, and a connecting piece 12b that protrudes from the bottom of the diaphragm portion 12a toward the motor 2. Although one diaphragm portion 12a is shown in Fig. 2, the diaphragm 12 may have a plurality of diaphragm portions 12a and the same number of connecting pieces 12b.

[0031] The driving mechanism 11 has, for example, a support part 13 fixed to the shaft 4 so as not to rotate relative to the shaft 4, and a driver 14 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.

[0032] The connecting piece 12b of the diaphragm 12 is engaged with the arm 14b in a penetrating state. Therefore, the rotation of the driver 14 is restricted by the diaphragm 12. As a result, the rotation of the support part 13 which rotates together with the shaft 4 is converted into a reciprocating motion of the arm 14b in the axial direction and transmitted to the diaphragm part 12a via the connecting piece 12b. This causes the volume inside the diaphragm part 12a to increase or decrease. Note that, although one arm 14b is illustrated in FIG. 2, when the diaphragm 12 is provided with a plurality of diaphragm parts 12a, the driver 14 may have the same number of arms 14b.

[0033] The pump housing 30 is a member forming the outer periphery of the pump 3, and is made of an elastic body (e.g., resin). In this embodiment, the pump housing 30 is formed by combining a plurality of members 31 to 34 in the axial direction. Specifically, the pump housing 30 has a bottom body 31, a first intermediate body 32, a second intermediate body 33, and a cover body 34, and is formed by combining these members 31 to 34 so that they are arranged in this order from the second direction.

[0034] The bottom body 31 is a cylindrical member with a bottom that houses the drive mechanism 11, and has a seat portion 35 that is arranged to face the housing 20 in the axial direction when the pump 3 is attached to the motor 2 (hereinafter referred to as the "attached state"). The first intermediate body 32 is a member that forms a mounting surface for the diaphragm 12, and forms a suction chamber 3B together with the second intermediate body 33 and the diaphragm 12. The second intermediate body 33 is a member that holds the diaphragm 12 together with the first intermediate body 32. The lid body 34 is a member that covers the members 31 to 33 from a first direction, and forms a discharge chamber 3C together with the second intermediate body 33. The discharge port 3D is formed on the radially inner side of the lid body 34.

[0035] The above-mentioned protrusion 39 and claw 40 are provided on the bottom body 31 having the pedestal 35. The protrusion 39 is provided on the pedestal 35. The claw 40 in this embodiment is provided on the wall 37 extending from the pedestal 35 toward the housing 20 (in the second direction). More specifically, the claw 40 is provided at a position on the wall 37 intersecting with each of the first diameter line D and the second diameter line E.

[0036] The bottom body 31 will be described in detail below with reference to Figs. 2 to 5. Fig. 3 is an axial cross-sectional view of the bottom body 31, and Fig. 4 is a plan view of the bottom body 31 viewed from a second direction. Also, Fig. 5 is a perspective view of the bottom body 31 viewed from the second direction and from the radially outer side. As shown in Fig. 3, the bottom body 31 has a base portion 35 and a tubular portion 36. The bottom body 31 may further be provided with a wall portion 37 and an auxiliary wall portion 38. In this embodiment, the bottom body 31 is made of resin, and these portions 35 to 38 are integrally molded with the above-mentioned protrusion portion 39 and claw portion 40.

[0037] The base portion 35 is a portion forming the bottom of the cylindrical bottom body 31 and has, for example, a flat plate shape that has a uniform thickness in the axial direction and is expanded in a direction perpendicular to the axial direction. A base surface 35a of the base portion 35 facing the second direction abuts against the outer end surface 22a of the motor 2 in the attached state, for example, as shown in FIG.

[0038] The base portion 35 of this embodiment has an oval outer shape as shown in Fig. 4. That is, the base portion 35 has, as its periphery, two arcuate edges 35j that are spaced apart from each other and extend in the circumferential direction, and a linear edge 35k that connects the ends of the two arcuate edges 35j. The two arcuate edges 35j are provided so as to be point-symmetric with respect to the axis C, and each of them is provided so as to straddle the first diameter line D and the second diameter line E.

[0039] A central hole is provided in the radially inner portion of the base portion 35, through which the shaft 4 passes and into which the bearing accommodating portion 24 fits when in an attached state. A through hole 35h is provided in the arcuate end edge 35j of the base portion 35 at a position overlapping with the claw portion 40 when viewed from the axial direction. By providing the through hole 35h, the bottom body 31 is configured to have no undercut portion, which facilitates integral molding with resin.

[0040] The cylindrical portion 36 is a portion that forms the cylindrical 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 for accommodating the drive mechanism 11. Since the base portion 35 in this embodiment is oval-shaped, the cylindrical portion 36 is also oval-shaped when viewed from the axial direction. As shown in FIG. 5, a protrusion for engaging with the cover body 34 may be provided on the outer circumferential surface of the cylindrical portion 36. The pump housing 30 is integrated with the bottom body 31 and the cover body 34 by the cover body 34 engaging with the protrusion provided on the cylindrical portion 36, with the first intermediate body 32 and the second intermediate body 33 sandwiched between them.

[0041] As described above, the wall portion 37 is a portion extending from the base portion 35 in the second direction. In the pump 3 of this embodiment, a plurality of (here, two) wall portions 37 are provided spaced apart from each other so as to sandwich the housing 20. More specifically, the two wall portions 37 extend in the second direction from each of the two arc-shaped end edges 35j as shown in Fig. 4, and sandwich the side portion 21 of the housing 20 in the attached state as shown in Fig. 2. The circumferential length of each arc-shaped end edge 35j and the circumferential length of the wall portion 37 extending from the arc-shaped end edge 35j are set to be equal to each other, for example.

[0042] As shown in FIG. 4, the wall portion 37 is provided over the entire area of ​​the arcuate end 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. 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 substantially 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 arcuate end edge 35j and the circumferential length of the wall portion 37 may be different. The circumferential length of the wall portion 37 on the first direction side may be different from that on the second direction side. The wall portion 37 may have a shape in which the circumferential length becomes shorter toward the second direction, for example.

[0043] 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 Figs. 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. The auxiliary wall portion 38 of this embodiment also has the function of preventing leakage of operating sounds of parts (e.g., the drive mechanism 11 and the diaphragm 12) housed in the pump housing 30.

[0044] 5, the auxiliary wall portion 38 is provided with an auxiliary surface 38a that connects the seat surface 35a of the seat 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 that of the outer circumferential surface 23a so as to be in surface contact with the outer circumferential surface 23a of the corner portion 23 in accordance with the shape of the corner portion 23 of the motor 2 in the attached state.

[0045] At least two auxiliary wall portions 38 are provided on each wall portion 37. 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, as shown in Fig. 4. 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.

[0046] As described above, the base portion 35 has a through hole 35h formed at a position overlapping with the claw portion 40 when viewed from the axial direction. Therefore, the operating sound of the pump 3 may leak from the through hole 35h to the outside of the pump housing 30. In addition, the outer peripheral surface 23a of the corner portion 23 of the motor 2 is rounded (R). Therefore, the operating sound of the pump 3 that has leaked to the outside of the pump housing 30 via the through hole 35h may leak from a gap between the outer peripheral surface 23a of the corner portion 23, the base surface 35a of the base portion 35, and the inner wall surface 37a of the wall portion 37.

[0047] In contrast, in this embodiment, an auxiliary wall portion 38 is provided at each of both ends in the extension direction of each wall portion 37. As a result, the above-mentioned gap is blocked by the corner portion 23, the wall portion 37, and the two auxiliary wall portions 38, thereby preventing the operation sound of the pump 3. Also, the auxiliary surface 38a of each auxiliary wall portion 38 is in surface contact with the outer circumferential surface 23a of the corner portion 23 in the attached state, thereby suppressing rattling in the direction in which the pump 3 inclines axially along the outer circumferential surface 23a of the corner portion 23 relative to the motor 2. In other words, the auxiliary wall portion 38 plays three roles: reinforcing the wall portion 37, preventing the operation sound of the pump 3, and suppressing rattling of the pump 3.

[0048] The protrusion 39 is a portion that protrudes from the seat surface 35a of the seat portion 35 toward the second direction side, 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 having an outer shape that can be press-fitted into the hole portion 25 of the housing 20, and is press-fitted and fixed into the hole portion 25 of the housing 20 in the attached state, thereby determining the axial position of the pump 3. In this embodiment, the protrusion 39 is cross-shaped when viewed from the axial direction.

[0049] The number of protrusions 39 provided on the bottom body 31 may be at least one, but is preferably two or more. Here, the number of protrusions 39 is the same as the number of holes 25 of the housing 20, that is, 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 with the axis C in between.

[0050] The claw portion 40 is a portion that engages with the recess 26 of the housing 20 in a state in which the protrusion 39 is press-fitted and fixed in the hole 25 of the housing 20, i.e., in an attached state. In this embodiment, the claw portion 40 is provided to protrude radially inward from the tip (end portion on the second direction side) of the wall portion 37. For this reason, 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. As shown in Fig. 5, the claw portion 40 forms a circumferentially elongated protrusion that corresponds to the shape of the recess of the above-mentioned recess 26.

[0051] The number of claws 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 claws 40 is the same as the number of recesses 26 of the housing 20, that is, four. In other words, four recesses 26 and four claws 40 are provided. Of the four claws 40, two claws 40 are provided on the first diameter line D with the axis C between them. The remaining two claws 40 are provided on the second diameter line E with the axis C between them. On each of the two walls 37, one claw 40 located on the first diameter line D and one claw 40 located on the second diameter line E are protruded.

[0052] [2. Actions and Effects] (1) In the pump 3 and motorized pump 1 described above, 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. In addition, 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 a fluid.

[0053] With such pump 3, fixing of pump 3 to motor 2 is completed simply by inserting protrusion 39, which protrudes axially from base portion 35, into hole portion 25 from the first direction to the second direction. In other words, simply inserting protrusion 39 into hole portion 25 from the first direction completes both press-fitting and fixing of protrusion 39 into hole portion 25 and engagement of claw portion 40 into recess 26. Thus, pump 3 can be easily fixed to motor 2.

[0054] Furthermore, according to the above-mentioned configuration, the pump 3 can be fixed (coupled) to the motor 2 after the motor 2 and the pump 3 are assembled, so that the product quality and versatility of both the pump 3 and the motor 2 can be improved. The pump 3 (bottom body 31) does not have to be fixed to the motor 2 after the motor 2 and the pump 3 are assembled. In other words, the pump 3 is intended to include not only a completed product, but also its precursor. In the above-mentioned motorized pump 1, it is also possible to assemble the pump 3 by assembling the other parts 11, 12 and members 32 to 34 constituting the pump 3 to the bottom body 31 after only the bottom body 31 is fixed to the motor 2.

[0055] Furthermore, in the above-described pump 3, the claws 40 are engaged with the recesses 26, and the protrusions 39 are press-fitted and fixed into the holes 25, thereby fixing the pump 3 to the motor 2. This makes it possible to fix the pump 3 to the motor 2 more stably.

[0056] In a reciprocating positive displacement pump 3, axial wobble of the pump 3 relative to the motor 2 can affect the axial reciprocating motion of the pump 3. In contrast, in the above-described pump 3, the protrusion 39 is press-fitted and fixed into the hole 25, eliminating wobble (axial wobble) that can occur with only snap-fit ​​fixing by the claws 40, and also achieving axial positioning. This improves the pump performance.

[0057] Additionally, in the above-described pump 3 and motorized pump 1, the portions 39, 40 for fixing the pump 3 are provided so as to protrude from the pump housing 30. In other words, the motor 2 is not required to have a protrusion or convex portion for fixing the pump 3 to its housing 20. In this way, the pump 3 does not require the motor 2 to have a function (protrusion) that is unnecessary for the motor 2, so that the productivity of the motor 2 alone can be improved. Also, by utilizing an existing hole that plays a role in positioning the motor 2 during manufacture as the hole portion 25 and utilizing an existing convex portion for positioning the magnet as the recess portion 26, versatility can be improved.

[0058] (2) The pump housing 30 is provided with a wall portion 37 extending from the base portion 35 toward the housing 20. The claw portion 40 protrudes radially inward from the wall portion 37. By providing the claw portion 40 on the wall portion 37 in this manner, the claw portion 40 can be strengthened. This makes it possible to prevent the claw portion 40 and the wall portion 37 from breaking when the claw portion 40 is snap-fitted into the recess 26.

[0059] (3) Furthermore, the pump housing 30 is provided with a plurality of wall portions 37, and each wall portion 37 is provided with a plurality of claw portions 40. In the above-described pump housing 30, two wall portions 37 are each provided with two claw portions 40, for a total of four claw portions 40. The housing 20 is provided with four recesses 26 corresponding to this.

[0060] In this way, by providing a plurality of walls 37 and engaging the respective claws 40 provided on each wall 37 with the respective recesses 26, the pump 3 can be fixed more stably to the motor 2. Furthermore, if the respective claws 40 and the respective recesses 26 are provided symmetrically on the diameter lines D and E so as to sandwich the shaft 4, it is possible to reduce bias in the engagement points. Therefore, the pump 3 can be fixed more stably to the motor 2.

[0061] Further, the pump housing 30 is provided with a plurality of protrusions 39, and the housing 20 is provided with a plurality of holes 25 corresponding thereto. In this manner, the plurality of protrusions 39 are press-fitted and fixed into the plurality of holes 25, respectively, so that the pump 3 can be more stably fixed to the motor 2. In addition, the axial positioning accuracy of the pump 3 can be improved, so that the pump performance can be improved. Furthermore, if the plurality of protrusions 39 and the plurality of holes 25 are symmetrically provided on the first diameter line D so as to sandwich the shaft 4, the bias of the press-fitting points can be reduced. Therefore, the stability of the fixation of the pump 3 to the motor 2 and the pump performance can be further improved.

[0062] Furthermore, in the pump 3 described above, the multiple wall portions 37 are provided spaced apart from one another to sandwich the housing 20. By providing the multiple wall portions 37 spaced apart from one another in this manner, the wall portions 37 are easily deformed when the claw portions 40 are snap-fitted, so that chipping or breaking of the claw portions 40 can be prevented.

[0063] Furthermore, by providing multiple wall portions 37 on either side of the housing 20, the engagement of the claw portions 40 with the recesses 26 can be released when removing the attached pump 3 from the motor 2 without disassembling the motor 2 or the pump 3. In other words, the pump 3 can be removed from the motor 2 without requiring 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.

[0064] (4) When multiple wall portions 37 are provided on either side of the housing 20, if each wall portion 37 is in surface contact with the side portion 21 of the housing 20 in the attached state, the wall portions 37 can restrict radial movement of the pump 3 relative to the motor 2. Therefore, radial rattling of the pump 3 relative to the motor 2 can also be suppressed.

[0065] (5) In the pump housing 30, the two auxiliary walls 38 provided on each wall 37 are provided at positions sandwiching the claws 40 and are in surface contact with the corners 23 of the housing 20 along the shape of the corners. This makes it possible to reinforce the walls 37, suppress rattling of the pump 3, and attenuate the operating noise of the pump 3.

[0066] (6) In the pump 3 and motorized pump 1 described above, the pump housing 30 is made of an elastic body, and the housing 20 is made of a rigid body. In this way, the pump housing 30 is formed of an elastic body having a higher elasticity than the housing 20, and thus elastic deformation of the pump housing 30 is permitted when the claw portions 40 are snap-fitted, thereby preventing chipping or breaking of the claw portions 40. In addition, the housing 20 is formed of a rigid body having a higher rigidity than the pump housing 30, and thus the protrusions 39 can be more firmly press-fitted into the holes 25.

[0067] [3. Modifications] The above-described configurations of the pump 3 and the motorized pump 1 are merely examples, and are not limited to the above-described configurations. In addition to the above-described portions 35 to 40, the pump housing 30 may be provided with a portion for more closely fitting the claw portion 40 to the recess 26 in the attached state.

[0068] A pump 3' of the modified example will be described below with reference to Figures 6 to 8. In the following description, the same components as those described in the embodiment will be given the same reference numerals, and a description of the components and effects will be omitted. Furthermore, components corresponding to those described in the embodiment will be given a prime (') after the reference numerals of the embodiment, and a detailed description will be omitted.

[0069] 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' has a protrusion 42. The pump housing 30' has 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 outer shape of the base portion 35' is circular.

[0070] The pump 3' of the modified example includes a pump housing 30', and is attached to the motor 2 of the embodiment to form a pump with a motor. The pump housing 30' is provided with a base portion 35', two protrusions 39, two claw portions 40, two connection pieces 41, and one protrusion 42, as shown in Figs. 6 and 7.

[0071] In this modification, the base portion 35' has a circular shape that covers the motor 2 from the first direction, as shown in FIG. 7. The two protrusions 39 protrude from the base surface 35a' of the base portion 35' in the axial direction, as shown in FIG. 6, and are provided on the first diameter line D on which the hole portion 25 of the housing 20 is provided, sandwiching the axis C, as shown in FIG. The two claws 40 are also provided on the first diameter line D, sandwiching the axis C, and engage with the two recesses 26 provided on the first diameter line D, respectively, in the attached state. Although not shown in FIGS. 6 to 8, the base portion 35' may have holes corresponding to the through holes 35h of the embodiment at positions overlapping with the claws 40 when viewed from the axial direction.

[0072] As shown in FIG. 6, the connection piece 41 is a portion that connects the base portion 35′ and the claw portion 40, and is extended from the base portion 35′ in the second direction. In this modification, two connection pieces 41 are provided corresponding to the number of claw portions 40. As shown in FIG. 7, the two connection pieces 41 are provided on the first diameter line D with the axis C in between. The claw portion 40 protrudes from the tip of the connection piece 41 toward the radially inward direction. In this modification, the connection piece 41 extends from the periphery 35e of the base portion 35′. The connection piece 41 and the base portion 35′ form an L-shaped cross-section portion (a portion surrounded by a rectangle B in FIG. 6) with a portion (a part of the base portion 35′) that extends from the radially inward toward the outer side and a portion (connection piece 41) that bends after the extension and extends in the second direction.

[0073] The protrusion 42 protrudes from the base portion 35' and is a portion that comes into contact with the outer end surface 22a of the housing 20 in the attached state, and is disposed at a position spaced apart from the connecting piece 41. In this modified example, the protrusion 42 protrudes slightly in the second direction from the base surface 35a' of the base portion 35'. The protrusion 42 is also provided at a position spaced apart from the connecting piece 41, near the central hole of the base portion 35' through which the shaft 4 is inserted, in other words, near the shaft 4.

[0074] 7, for example, protrusion 42 has an annular shape going around the central hole when viewed in the axial direction in the vicinity of 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 hinder the press-fitting and fixing of protrusion 39 into hole 25.

[0075] As shown in FIG. 8, in the pump 3′ of the modified example, the protrusion 42 is provided, so that in the mounted state, the portion of the base 35′ around the protrusion 42 is slightly raised without abutting against the outer end surface 22a of the housing 20. As a result, as shown by the dashed line in FIG. 8, a part of the L-shaped base 35′ and the connecting piece 41 are deformed with the protrusion 42 as a base point. More specifically, the base 35′ is elastically deformed so that the portion around the connecting piece 41 is positioned in the second direction more than the portion around the protrusion 42, as shown by the outlined arrow in FIG. 8. In addition, the connecting piece 41 is deformed so that its tip moves radially inward as the base 35′ is deformed, as shown by the filled arrow in FIG. 8. This allows the claw 40 provided at the tip of the connecting piece 41 to be more closely attached to the recess 26. Therefore, the claw 40 is less likely to come off the recess 26, and the pump 3′ and the motor 2 can be more stably fixed.

[0076] Furthermore, in the pump 3' of the modified example, a tension is applied to the connecting piece 41 in the first direction by a force that causes the base portion 35' and the connecting piece 41 to return to their original shape after the above-mentioned deformation. This prevents the connecting piece 41 from moving in the direction in which the engagement between the claw portion 40 and the recess 26 loosens (i.e., the second direction). This also makes it more difficult for the claw portion 40 to come off the recess 26.

[0077] In the modified pump 3', the protrusion 42 is provided near the shaft 4. By providing the protrusion 42 at a position farther away from the connecting piece 41 in this manner, the above-mentioned deformation of the base portion 35' and the connecting piece 41 can be further promoted. Therefore, it is possible to make it more difficult for the claw portion 40 to come off the recess 26. In addition, the modified pump 3' also provides the same effects as the pump 3 described above.

[0078] It should be noted that the modified pump 3' is merely an 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 a position 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.

[0079] 7, the protrusion 42 is preferably provided on a first diameter line D (straight line) connecting the two claws 40 and a third diameter line F (line) perpendicular to the axis C of the shaft 4. This can promote the above-mentioned deformation of the base 35' and the connecting piece 41, and can make the engagement degree of each of the two claws 40 with the recess 26 approximately the same, so that the fixation of the pump 3' to the motor 2 can be more stably performed.

[0080] [4.Other] The configurations of the pumps 3, 3' and motorized pump 1 described above are merely examples, and are not limited to the above configurations. The pumps 3, 3' are not limited to diaphragm pumps, as long as they convert at least the rotational motion of the shaft 4 into reciprocating motion in the axial direction of the shaft 4. The pumps 3, 3' may be, for example, plunger pumps or bellows pumps.

[0081] 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.

[0082] In the pump 3 of the embodiment, two or more auxiliary wall portions 38 may be provided on each wall portion 37. Also, the auxiliary wall portions 38 may be omitted. In the pump 3 of the embodiment, instead of the wall portions 37, portions corresponding to the connecting pieces 41 of the modified example may be provided in the same number as the claw portions 40. Similarly, in the pump 3' of the modified example, instead of the connecting pieces 41, portions corresponding to the wall portions 37 of the embodiment may be provided. In the pump 3 of the embodiment, portions corresponding to the protrusion portions 42 of the modified example may be provided. Depending on the relative positions of the housing 20 and the pump housings 30, 30', it is also possible to omit the wall portions 37 and the connecting pieces 41.

[0083] The hole 25 of the housing 20 need only be a portion that forms a hole (recess) into which the protrusion 39 can be press-fitted and fixed, and does not need to penetrate the bottom surface portion 22 in the axial direction. The recess 26 of the housing 20 need only be a portion with which the claw 40 can be engaged in the attached state. The recess 26 may be, for example, a portion that forms a through-hole that penetrates the side surface portion 21 in the radial direction. The portion in which the recess 26 is provided does not need to be the side surface portion 21. [Explanation of symbols]

[0084] 1 Pump with motor 2 Motors 3,3′ Pump 4 Shaft 20. Housing 23 Corner 25 Hole 26 Recess 30,30′ Pump housing 35,35′ Pedestal 37 Wall section (connection section) 38 Auxiliary wall 39 Convex 40 Claw part 41 Connection piece (connection part) 42 Protrusion C axis D First diameter line (straight line) F Third diameter line (line)

Claims

1. A pump that converts rotational motion of a motor shaft into reciprocating motion in the axial direction of the shaft to discharge a fluid, a pump housing having a base portion disposed opposite to a housing of the motor through which the shaft is inserted in the axial direction; The pump housing is provided with a protrusion that protrudes from the base portion in the axial direction and is press-fitted into a hole formed in the housing, and a claw that engages with a recess formed in the housing when the protrusion is press-fitted into the hole, The pump housing has a wall portion extending from the base portion toward the housing, and at least two auxiliary wall portions provided across the wall portion and the base portion, The claw portion protrudes from the wall portion toward a radially inner side of the shaft, The at least two auxiliary wall portions are provided at positions sandwiching the claw portion in the extending direction of the wall portion as viewed from the axial direction, and are in surface contact along the corner shape of the housing. A pump characterized by:

2. The wall portions are provided in plurality and spaced apart from one another so as to sandwich the housing.

2. The pump according to claim 1, characterized in that

3. A pump that converts rotational motion of a motor shaft into reciprocating motion in the axial direction of the shaft to discharge a fluid, a pump housing having a base portion disposed opposite to a housing of the motor through which the shaft is inserted in the axial direction; The pump housing is provided with a protrusion that protrudes from the base portion in the axial direction and is press-fitted into a hole formed in the housing, and a claw that engages with a recess formed in the housing when the protrusion is press-fitted into the hole, the pump housing has a connection portion that connects the base portion and the claw portion, and a protrusion that protrudes from the base portion, The protrusion is disposed at a position separated from the connection portion, and the protrusion is press-fitted and fixed into the hole and comes into contact with the housing. A pump characterized by:

4. The protrusion is provided near the shaft.

4. The pump according to claim 3, characterized in that

5. The pump housing is provided with two claw portions that are arranged opposite to each other with the shaft in between, The protrusion is provided on a line that is perpendicular to the line connecting the two claws and the axis of the shaft.

5. A pump according to claim 4, characterized in that

6. The pump housing is made of an elastic material, The housing is made of a rigid body.

2. The pump according to claim 1, characterized in that

7. The pump housing is made of an elastic material, The housing is made of a rigid body.

4. The pump according to claim 3, characterized in that

8. At least two of the holes and at least two of the protrusions are provided, At least two of the recesses and the claws are provided.

2. The pump according to claim 1, characterized in that

9. At least two of the holes and at least two of the protrusions are provided, At least two of the recesses and the claws are provided.

4. The pump according to claim 3, characterized in that

10. A pump according to any one of claims 1 to 9; a motor that drives the pump; A motorized pump.

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