JP2013036349A - Diaphragm pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts, and to easily introduce automatic assembling at mounting a motor, in the diaphragm pump.SOLUTION: A cylindrical motor holder 16 is integrally formed at a bottom 15a of a mounter 15. An outer circumferential surface of a motor 2 includes a plurality of recesses 7 that are simultaneously formed when an abutting portion 3a for mounting a permanent magnet 6 at a predetermined position of a yoke 3 is formed by indentation. By fitting the motor 2 into the motor holder 16 and making a ceiling 3b abut on a lower face 15d of the bottom 15a, the recesses 7 are engaged with projections 16a protruding on an inner circumferential surface of the motor holder 16 to mount the motor 2 on the mounter 15.

Description

  The present invention relates to a diaphragm pump for pressurizing or depressurizing a fluid in a sphygmomanometer, a home appliance or the like.

  As a conventional diaphragm pump, there is a motor attached to the bottom of the mounter, a crank attached to an output shaft facing the mounter of the motor, and one end in a state inclined to a portion displaced from the output shaft of the crank. A drive shaft having a fixed portion, a drive body having a central portion pivotally supported at the other end of the drive shaft and swinging as the drive shaft rotates, and attached to the drive body of the drive body And a diaphragm having a diaphragm portion that forms a pump chamber. When the motor is driven, the crank rotates, and the drive shaft rotates while changing the tilt direction, whereby the drive element swings and the pump chamber expands and contracts. There is a thing which performs a pump action by this (for example, refer to patent documents 1).

Japanese Patent No. 4230761

  Since the conventional diaphragm pump as described above has a structure in which the motor is fixed to the bottom of the mounter with a screw, there is a problem that a screw for fixing is required and the number of parts cannot be reduced. Further, since the motor is attached to the mounter by screwing, there is a problem that it is difficult to introduce automation of the attaching work.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to reduce the number of parts and facilitate the introduction of automatic assembly during motor mounting operations.

  In order to achieve this object, the present invention provides a motor as a drive source, a crank that rotates integrally with the output shaft of the motor, and a drive body that has a driver that reciprocates as the crank rotates. A diaphragm that forms a pump chamber that expands and contracts by reciprocating movement of the driver of the driver, a suction passage for sucking fluid into the pump chamber, a discharge passage for discharging fluid in the pump chamber, A suction valve body that is provided in the suction passage and restricts the backflow of fluid from the pump chamber to the suction passage; and a discharge valve body that is provided in the discharge passage and restricts the backflow of fluid from the discharge passage to the pump chamber. The diaphragm pump provided includes an elastically deformable cylindrical mounter to which the motor is attached, and the motor is inserted into the mounter to fit the motor. It is provided with a projection which recesses engage formed in the outer peripheral portion.

  According to the present invention, in the above invention, the mounter is provided with an abutting surface against which the ceiling portion of the motor abuts when the recess of the motor is engaged with the protrusion of the mounter.

  According to the present invention, in any one of the above inventions, the motor is mounted on the output shaft surrounded by the permanent magnet, a permanent magnet attached to the inner surface of the yoke, and the permanent magnet. A rotor, and the concave portion is a concave portion formed to provide an abutting portion for locking the permanent magnet at a predetermined position when the permanent magnet is press-fitted into the yoke. It is.

  According to the present invention, the motor can be attached to the mounter by inserting the motor into the mounter and engaging the protrusions with the recesses while elastically deforming the mounter, so that a screw for attaching the motor to the mounter is unnecessary. become. In addition, since the motor can be attached to the mounter by moving the motor in a substantially linear shape along the axial direction of the mounter with the motor fitted in the mounter, automatic assembly during motor installation work is possible. Easy to install.

  According to one of the inventions described above, the motor is fitted in the mounter, and when the ceiling portion of the motor is abutted against the abutting surface, the projection is engaged with the concave portion, so that the motor can be mounted reliably and easily. At the same time, it is easy to introduce automatic assembly during motor mounting.

  According to one of the inventions described above, since the recess formed simultaneously with the formation of the abutting portion for locking the permanent magnet when the permanent magnet is attached to the yoke, the recess is newly added to the motor. The work for forming is eliminated.

It is sectional drawing of the diaphragm pump which concerns on this invention. It is sectional drawing of the motor in the diaphragm pump which concerns on this invention. The mounter in the diaphragm pump which concerns on this invention is shown, The figure (A) is the perspective view seen from the bottom face side, The figure (B) is a bottom view. It is sectional drawing of the diaphragm pump which shows the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. Note that “upper and lower” used to describe the direction in the specification refers to the direction in the figure for the sake of convenience of explanation, and is the upper and lower when actually using the diaphragm pump according to the present invention. The bottom does not necessarily match.
[Embodiment 1]

  First, a first embodiment of the present invention will be described with reference to FIGS. A diaphragm pump generally indicated by reference numeral 1 in FIG. 1 includes a motor 2 as a drive source having a circular plan view. As shown in FIG. 2, the motor 2 includes a motor housing 5 formed by a cap-shaped yoke 3 that opens downward and a bottom plate 4 that closes the opening of the yoke 3. On the outer peripheral surface of the upper portion of the cylindrical portion of the yoke 3, when the abutting portion 3a is protruded toward the inside of the yoke 3 by pressing, a plurality of concave portions 7 formed simultaneously are provided in the circumferential direction. . The plurality of recesses 7 are positioned at the same position in the direction of arrow A (position in the height direction in the figure). Reference numeral 6 denotes a permanent magnet attached to the inner peripheral surface of the yoke 3, which is attached to the yoke 3 at a predetermined position by being press-fitted into the yoke 3 from below and the upper end surface 6a being locked to the abutting portion 3a.

  Reference numeral 8 denotes an output shaft, which is rotatably supported by a bearing 9 fixed to an opening provided in the central portion of the ceiling portion of the yoke 3 and a bearing 10 fixed to the central portion of the bottom plate 4. A thrust receiver 4a that closes the bearing hole of the bearing 10 and engages the non-driving end 8a of the output shaft 8 is provided at the center of the bottom plate 4, and the driving end 8b of the output shaft 8 is located above the bearing 9. Protrudes toward. A rotor 12 that is opposed to the permanent magnet 6 at a certain interval is axially attached to the central portion of the output shaft 8, and a commutator 13 is axially attached to the lower portion of the rotor 12.

  In FIG. 1, reference numeral 15 denotes a mounter whose upper part is opened by resin and is formed in a substantially bottomed cylindrical shape by a bottom part 15a and a cylindrical part 15b, and a shaft hole 15c is provided at the center of the bottom part 15a. As shown in FIG. 3A, the mounter 15 extends to the opposite side across the bottom 15a, and is integrally provided with a cylindrical motor holding portion 16 having the same diameter as the cylindrical portion 15b.

  The inner diameter of the motor holding portion 16 is slightly larger than the outer diameter of the motor 2. On the inner peripheral surface of the motor holding portion 16, a plurality of protrusions 16 a that engage with the concave portion 7 of the motor 2 described above are provided so as to protrude toward the center direction (radial direction) of the motor holding portion 16. The motor holding portion 16 is elastically deformed when the concave portion 7 is engaged with the protrusion 16a when the motor 2 is inserted as described later.

  The distance D (see FIG. 3A) between the protrusion 16a and the lower surface 15d as the contact surface of the bottom 15a is the same as the distance D (see FIG. 2) between the ceiling 3b of the yoke 3 of the motor 2 and the recess 7. It is set to length. Therefore, as will be described later, when the motor 2 is fitted into the motor holding portion 16, if the ceiling portion 3 b of the motor 2 hits the lower surface 15 d of the bottom portion 15 a of the mounter 15 (the ceiling surface of the motor holding portion 16), The concave portion 7 of the motor 2 is engaged with the protrusion 16 a of the holding portion 16.

  As shown in FIG. 3, the cylindrical portion 15 b of the mounter 15 has three grooves 17 extending up and down at an equal angle (120 °) in the circumferential direction and extending to the motor holding portion 16. Yes. Since the motor holding portion 16 is divided into three in the circumferential direction by the three grooves 17, the motor holding portion 16 is easily elastically deformed when the concave portion 7 is engaged with the protrusion 16a.

  In FIG. 1, reference numeral 20 denotes a crank that is formed in a substantially columnar shape, and a driving end portion 8 b of the output shaft 8 of the motor 2 is fixed to the center portion, and rotates integrally with the output shaft 8. 21 is a drive shaft, and the lower end portion is attached in a state of being inclined from the portion where the drive end portion 8b of the crank 20 is attached to the eccentric portion.

  Reference numeral 23 denotes a driving body provided with a non-through hole 23a at the center, and the upper end protrudes in a direction perpendicular to the non-through hole 23a at an equal angle (120 °) in the circumferential direction in plan view. Three provided driver elements 23b (two driver elements 23b are not shown) are integrally provided. These drive elements 23b are formed so as to slightly incline downward by the same angle toward the swing end portion side, and each swing end portion is provided with a diaphragm mounting hole 23c.

  The drive body 23 is rotatably supported by the drive shaft 21 by inserting the upper portion of the drive shaft 21 into the non-through hole 23a. When the crank 20 is rotated by driving the motor 2, the drive body 23 is rotated. The drive shaft 21 rotates while changing the tilt direction, and the swing end portions of the three driver elements 23b sequentially swing in the vertical direction via the drive shaft 21.

  Reference numeral 25 denotes a diaphragm holder formed in an inverted bottomed cylindrical shape, and three holding cylinders 25a formed in a cylindrical shape on the ceiling are integrally provided at equal angles (120 °) to each other in the circumferential direction. ing.

  Reference numeral 26 denotes a diaphragm formed in a substantially disc shape by a flexible material such as rubber, and three diaphragm portions 26a formed in a thin wall form at equal angles (120 °) to each other in the circumferential direction. Is provided. A piston portion 26b is integrally provided at a lower portion of the diaphragm portion 26a, and a small diameter portion 26c is integrally provided at a lower end of the piston portion 26b.

  Reference numeral 27 denotes a valve holder formed in a substantially disc shape. A cylindrical portion 27a is integrally provided on the outer peripheral edge, and three sets of suction holes 27b (intake passages) are provided on the inner peripheral edge of the cylindrical portion 27a. Two sets of suction holes 27b (not shown) are formed at equal angles (120 °) to each other in the circumferential direction. Further, an engaging convex portion 27c is integrally provided at the central portion of the valve holder 27, and around this engaging convex portion 27c, three sets of discharge holes 27d (two sets) as discharge passages are provided. The discharge holes 27d (not shown) are provided at equal angles (120 °) to each other in the circumferential direction, and the partition wall 27e is erected integrally with the cylindrical portion 27a.

  In FIG. 1, reference numeral 28 denotes an intake valve element formed in an umbrella shape for opening and closing the suction hole 27b, and restricts the backflow of fluid from the pump chamber 32 described later to the suction hole 27b. Reference numeral 29 denotes a discharge valve body attached to the engagement convex portion 27c and formed in a hat shape for opening and closing the discharge hole 27d, and restricts the backflow of fluid from a discharge port 30c to be described later to the pump chamber 32.

  Reference numeral 30 denotes a lid body formed in an inverted bottomed cylindrical shape. A cylindrical portion 30a is integrally projected downward on the outer peripheral edge, and a ring-shaped partition concentrically with the cylindrical portion 30a in the center. The wall 30b is integrally projected downward. A discharge cylinder 30d having a discharge port 30c is integrally provided at the center of the ceiling of the lid 30. A suction port 30e is formed at a part of the periphery of the ceiling. The suction cylinder 30f is erected integrally.

  Next, a method for assembling the diaphragm pump configured as described above will be described. In FIG. 1, the suction valve element 28 is attached to the valve holder 27 in advance, and the discharge valve element 29 is attached to the engaging projection 27c, and the lid 30 is overlapped on the valve holder 27 and sealed by welding or the like. A valve holder assembly 33 is formed. In this state, the cylindrical portions 27a and 30a face each other, the partition walls 27e and 30b contact each other, the suction hole 27b and the suction port 30e communicate with each other, and the discharge hole 27d and the discharge port 30c communicate with each other. The

  Next, the motor 2 is fitted into the motor holding portion 16 of the mounter 15 and is pushed in while being press-fitted so as to move the motor 2 in the axial direction (arrow A direction) of the mounter 15. While the motor holding portion 16 is elastically deformed, when the ceiling portion 3b which is the end surface on the drive end portion 8b side of the motor 2 is abutted against the lower surface 15d of the bottom portion 15a of the mounter 15 (the ceiling surface of the motor holding portion 16), the motor holding The concave portion 7 of the motor 2 is engaged with the protrusion 16 a of the portion 16. By this engagement, the motor 2 is attached to the bottom portion 15a of the mounter 15 so that the drive end portion 8b of the output shaft 8 faces the mounter 15 from the shaft hole 15c. Next, the lower end portion of the drive shaft 21 is fixed to the crank 20, and the crank 20 is attached to the drive end portion 8 b of the output shaft 8.

  In this way, a screw that is conventionally required to attach the motor 2 to the bottom 15a of the mounter 15 is not necessary. Further, the motor 2 can be attached to the mounter 15 by moving the motor 2 substantially linearly along the axial direction of the mounter 15 in a state where the motor 2 is fitted in the motor holding portion 16 of the mounter 15. Therefore, it is easy to introduce automatic assembly when the motor 2 is attached. Further, when the permanent magnet 6 is press-fitted into the yoke 3, the concave portion 7 that forms the abutting portion 3 a for locking the permanent magnet 6 at a predetermined position is used, so that the concave portion 7 is newly formed in the motor 2. Work is not necessary.

  Further, when the motor 2 is attached to the motor holding portion 16, when the ceiling portion 3 b of the motor 2 is abutted against the lower surface 15 d of the bottom portion 15 a of the mounter 15, the protrusion 16 a of the motor holding portion 16 is engaged with the concave portion 7 of the motor 2. . For this reason, since the protrusion 16a of the motor holding portion 16 can be reliably and easily engaged with the recess 7 of the motor 2, workability is improved, and automatic assembly can be easily introduced when the motor 2 is attached. .

  Next, each of the diaphragm portions 26 a of the diaphragm 26 is inserted into each holding cylinder 25 a of the diaphragm holder 25, and the diaphragm 26 is placed on the diaphragm holder 25. In this state, by attaching the small diameter portion 26c of each piston portion 26b to the attachment hole 23c of each driver 23b of the drive body 23, the drive body 23 and the diaphragm 26 are assembled to the diaphragm holder 25, and the diaphragm holder assembly 34 is assembled. Is formed.

  A valve holder assembly 33 is stacked on the diaphragm holder assembly 34 to form a pump assembly 35. In this state, three pump chambers 32 (two pump chambers 32 are not shown) are formed by the valve holder 27 and each diaphragm portion 26 a of the diaphragm 26, and three sets of valve holders 27 are formed in each pump chamber 32. Each of the discharge hole 27d and the suction hole 27b corresponds. Next, the pump assembly 35 is lowered from above the mounter 15, and the pump assembly 35 is placed on the mounter 15 while the upper part of the drive shaft 21 is fitted into the non-through hole 23 a of the drive body 23.

  In this state, the pump assembly 35 and the mounter 15 are integrated by a spring (not shown) inserted through the groove 17 of the mounter 15, thereby mounting the mounter 15, the diaphragm holder 25, the diaphragm 26, the valve holder 27, and the like. The lid body 30 is integrated in a laminated state to form the diaphragm pump 1.

  Next, the pump action in the diaphragm pump 1 configured as described above will be described. When the motor 2 is driven and the crank 20 is rotated via the output shaft 8, the swing end portions of the three driver elements 23 b of the drive body 23 are sequentially swung in the vertical direction. When the swinging end portion of the first driver element 23b moves downward, the first pump chamber 32 expands via the piston portion 26b, so that the air in the pump chamber 32 is in a negative pressure state.

  Accordingly, the suction hole 27b is closed by the suction valve body 28 and the suction hole 27b is opened. In this state, air sucked from the outside atmosphere through the suction port 30 e of the lid 30 flows into the first pump chamber 32.

  Next, when the swinging end of the driver 23b of the expanded first pump chamber 32 moves upward, the first pump chamber 32 contracts, so that the air in the first pump chamber 32 Since the pressure is increased, the discharge hole 27d is blocked by the discharge valve body 29 and the discharge hole 27d is opened, so that the air in the first pump chamber 32 passes through the discharge port 30c from the discharge hole 27d, Supplied to an object to be pressurized (not shown) connected to an air tube or the like.

  Furthermore, the crank 20 is rotated via the output shaft 8 and the second pump chamber 32 is expanded by moving the swinging end portion of the second driver element 23b downward. The air becomes negative pressure. Therefore, the air sucked from the outside atmosphere through the suction port 30e of the lid body 30 flows into the expanded second pump chamber 32.

  Next, when the swinging end portion of the driver 23b of the second expanded pump chamber 32 moves upward, the pump chamber 32 contracts, so that the air pressure in the pump chamber 32 increases, and the discharge valve Since the blockage of the discharge hole 27d by the body 29 is released and the discharge hole 27d is opened, the air in the second pump chamber 32 passes through the discharge hole 30c from the discharge hole 27d and is added to the air tube or the like. Supplied to the pressure object.

  Furthermore, the crank 20 rotates via the output shaft 8 and the third pump chamber 32 is expanded by moving the swinging end portion of the third driver 23b downward. The air becomes negative pressure. Therefore, the air sucked from the outside atmosphere through the suction port 30e of the lid body 30 flows into the expanded third pump chamber 32.

Next, when the swinging end of the driver 23b of the third expanded pump chamber 32 moves upward, the pump chamber 32 contracts, so that the air pressure in the pump chamber 32 increases, and the discharge valve Since the obstruction of the discharge hole 27d by the body 29 is released and the discharge hole 27d is opened, the air in the third pump chamber 32 passes through the discharge hole 30c from the discharge hole 27d and is added to the air tube or the like. Supplied to the pressure object. As described above, since the third pump chamber 32 sequentially expands and contracts, air with a small pulsating flow is continuously supplied from the discharge port 30c to the pressurized object.
[Embodiment 2]

  Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment described above in that the mounter 15 is not provided with a bottom portion 15a, and the mounter 15 is formed in a cylindrical shape whose top and bottom are both open. is there. In such a configuration, in order to attach the motor 2 to the mounter 15, the motor 2 is fitted into the mounter 15 from the lower side of the mounter 15 as in the first embodiment described above.

  Next, the motor 2 is press-fitted while moving in the direction of arrow A, whereby the recess 7 of the motor 2 is engaged with the protrusion 16 a of the mounter 15 while the mounter 15 is elastically deformed, and the motor 2 is attached to the mounter 15. Also in the second embodiment, as in the first embodiment described above, a screw for attaching the motor 2 to the mounter 15 is not necessary, and the motor 2 is moved substantially linearly in the direction of arrow A. Since it can be attached to the mounter 15 just by making it easy to install, the automatic assembly can be easily introduced when the motor 2 is attached.

  In the present embodiment, an example of a so-called three-cylinder having three pump chambers 32 is given, but it is needless to say that the present invention can be applied to a diaphragm pump having two cylinders or less or four cylinders or more. Further, although the example in which the suction valve body 28 and the discharge valve body 29 are provided separately from the diaphragm 26 has been described, the suction valve body 28 and the discharge valve body 29 may be formed integrally with the diaphragm 26. In addition, although the motor holding portion 16 and the mounter 15 are formed in a cylindrical shape, the motor holding portion 16 and the mounter 15 may have an elliptical cylindrical shape or a square cylindrical shape corresponding to the shape of the motor 2 in plan view. Alternatively, any shape that fits into the mounter 15 may be used. Further, in the present embodiment, the concave portion 7 that engages with the protrusion 16a of the mounter 15 is formed to provide the abutting portion 3a that locks the permanent magnet 6 when the permanent magnet 6 is attached to the yoke 3. However, the present invention is not limited to this, and other recesses formed in the yoke 3 may be used. Further, in the present embodiment, one end portion of the drive shaft 21 is fixed to the crank 20 and the other end portion is pivotally supported by the non-through hole 23a of the drive body 23. It is good also as a structure which is pivotally supported by the crank and the other end is fixed to the drive body, or a structure where the center part of the drive shaft is fixed to the drive body and the upper and lower ends are pivotally supported by the diaphragm holder and the crank, respectively. The drive shaft itself may be integrally formed with the drive body, and various design changes are possible. In short, the drive body having a drive element that reciprocates as the crank rotates, and the reciprocation of the drive element. The diaphragm which forms the pump chamber which expands / contracts by is sufficient.

  DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 2 ... Motor, 3 ... York, 3a ... Abutting part, 3b ... Ceiling part, 6 ... Permanent magnet, 7 ... Recessed part, 8 ... Output shaft, 12 ... Rotor, 15 ... Mounter, 15a ... Bottom part 15d: Lower surface (abutting surface), 16 ... Motor holding portion, 16a ... Projection, 20 ... Crank, 21 ... Drive shaft, 23 ... Drive body, 23b ... Driver, 25 ... Diaphragm holder, 26 ... Diaphragm, 26a ... Diaphragm portion 27 ... Valve holder, 28 ... Suction valve body, 29 ... Discharge valve body, 30 ... Lid body, 32 ... Pump chamber, 33 ... Valve holder assembly, 34 ... Diaphragm holder assembly, 35 ... Pump assembly.

Claims (3)

A motor as a driving source, a crank that rotates integrally with the output shaft of the motor, a driving body that reciprocates as the crank rotates, and expansion / contraction by reciprocation of the driving element of the driving body A diaphragm for forming a pump chamber, a suction passage for sucking fluid into the pump chamber, a discharge passage for discharging fluid in the pump chamber, and a suction passage provided in the suction passage from the pump chamber to the suction passage In a diaphragm pump comprising a suction valve body that restricts the backflow of fluid, and a discharge valve body that is provided in the discharge passage and restricts the backflow of fluid from the discharge passage to the pump chamber,
An elastically deformable cylindrical mounter to which the motor is attached is provided, and the mounter is provided with a protrusion that engages with a recess formed in an outer peripheral portion of the motor when the motor is inserted. Diaphragm pump.   2. The diaphragm pump according to claim 1, wherein the mounter is provided with an abutting surface against which a ceiling portion of the motor abuts when a recess of the motor is engaged with a protrusion of the mounter. The motor includes a cylindrical yoke, a permanent magnet attached to the inner surface of the yoke, and a rotor surrounded by the permanent magnet and attached to the output shaft.
The said recessed part is a recessed part formed in order to provide the abutting part which latches the said permanent magnet in a predetermined position when the said permanent magnet is press-fitted in the said yoke. Diaphragm pump.

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