JP2008038727A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components and miniaturize a device whole body in a diaphragm pump. <P>SOLUTION: A projection part 25 is supported by a holding part 38 of a diaphragm holder 35 to support a drive plate 3 swingably with its center part as a swing center. Four diaphragm parts 40 of a diaphragm 6 are attached to an outer circumference part of the drive plate 3, and a pump chamber 63 formed out of the diaphragm part 40 is expanded/contracted by swing action of the drive plate 3. A ball 4 is put between the drive plate 3 and a ceiling plate 20 of a rotor 13 of an outer rotor type motor 2, and the ball 4 is pressed against the ceiling plate 20 and the drive plate 3 by elastic repulsion force of a compression coil spring 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a diaphragm pump used for supplying compressed air in a blood pressure monitor or the like.

As a conventional diaphragm pump, a rotating plate mounted on the output shaft of the motor and a swinging plate facing the rotating plate so that the outer peripheral part is spaced apart from and approaches the rotating plate with the central part as the swinging center. A driving body supported by the driving body, a diaphragm attached to the outer periphery of the driving body, a ball interposed between the driving body and the rotating plate, and an urging means for pressing the driving body and the rotating plate against the ball And the ball revolves while rotating by rotating the rotating plate by driving the motor, whereby the drive body swings and the diaphragm performs a pumping action (see, for example, Patent Document 1).
JP 2002-130136 A (paragraphs [0032] to [0040], FIG. 2)

  The conventional diaphragm pump described above requires a rotating plate for swinging the driving body via a ball, and the rotating plate is attached to the output shaft of the motor, so that the number of parts increases. In addition, there is a problem that the dimension of the motor in the output shaft direction becomes large.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a diaphragm pump in which the number of parts is reduced and the entire apparatus is reduced in size.

  In order to achieve this object, the invention according to claim 1 is directed to an outer rotor type motor, and a ceiling plate of the rotor of the motor that faces the ceiling plate of the rotor and has an outer peripheral portion with respect to the ceiling plate of the rotor. A ball that is sandwiched between outer peripheries of a driving body that is swingably supported so as to be separated and approached, a diaphragm that is attached to the outer perimeter of the driving body, and a ceiling plate of the driving body and the rotor And an urging means for urging the driving body in a direction in which the balls are pressed against each other by the outer peripheral portions of the driving body and the ceiling plate of the rotor, and the rotor is rotated by rotating the rotor. The drive body is swung by the ball that moves along with the ceiling plate, and the diaphragm performs a pumping action.

  According to the present invention, the number of parts can be reduced because a rotating plate is not required as in the prior art. Further, since the ball is directly pressed against the rotor of the motor, the entire apparatus can be reduced in size.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view taken along line II in FIG. 2A, FIG. 2 shows a driving body of a diaphragm pump according to the present invention, FIG. 1A is a plan view, and FIG. FIG. 3C is a bottom view, FIG. 3 also shows a diaphragm, FIG. 3A is a plan view, and FIG. 3B is III (B) -III (III) in FIG. B) A cross-sectional view taken along the line, FIG. 4C is a bottom view, and FIG.

  A diaphragm pump generally indicated by reference numeral 1 in FIG. 1 includes an outer rotor type motor 2 that is a drive source, a drive body 3 that is swingably supported around a central portion, and the drive body 3 and the motor. And a compression coil spring serving as an urging means for urging the driving body 3 in a direction in which the ball 4 is pressed against the driving body 3 and the ceiling board 20. 5 and a diaphragm 6 attached to the driving body 3 and performing a pump action by the swinging motion of the driving body 3.

  The motor 2 includes a rotor 13 having an outer yoke 11 and an inner yoke 12, permanent magnets 15 N and 15 S attached to the cylindrical portion 14 of the outer yoke 11 so as to face each other, and a circle so as to surround the inner yoke 12. A three-phase coil 16 formed in an annular shape, a base 17 that supports the entire motor, bearings 18 and 18 attached to the base 17, and a shaft 19 of a rotor 13 that is rotatably supported by these bearings 18. And is roughly configured. In such a configuration, when the exciting current is supplied to the coil 16 from a power supply (not shown), the rotor 13 is rotated about the shaft 19 by the magnetic field generated from the coil 16. The ceiling plate 20 of the outer yoke 11 is provided with a fitting groove 20a formed in a ring shape in a plan view in which a part of the ball 4 is fitted.

  Reference numeral 22 denotes a mounting base formed in a substantially rectangular tube shape, and four mounting blocks 22a (only one mounting block 22a is shown) are provided at four corners, and each mounting block 22a includes a motor 2. The base 17 is attached by a screw 23 and a spring receiver 24 is attached.

   As shown in FIG. 2A, the driving body 3 is formed in a substantially disc shape, and has a convex portion 25 with an upper end formed in an arc shape at the center of the upper surface, and a large peripheral portion. Four convex portions 26 each having a diameter portion and a small diameter portion are erected integrally at an equal angle in the circumferential direction, and a screw hole 27 is screwed into each convex portion 26. Further, at the peripheral end of the driving body 3, four convex portions 28 are integrally projected in the plane direction at equal angles so as to be positioned between the four convex portions 26 in the circumferential direction. A spring receiver 30 is attached to the hole 29 provided in the convex portion 28. A fitting groove 31 formed in a ring shape in a plan view in which a part of the ball 4 is fitted is provided on the bottom surface of the driving body 3 as shown in FIG. Is formed in the same size as the diameter of the fitting groove 20 a provided in the ceiling plate 20.

  In FIG. 1, reference numeral 33 denotes a case formed in a rectangular tube shape. Reference numeral 35 denotes a diaphragm holder formed in a square shape in plan view, and a flange 36 projects downward from the peripheral end of the diaphragm holder 35. At the center of the diaphragm holder 35, a raised portion 37 having an arc-shaped cross section is projected, and the convex portion 25 of the driving body 3 is engaged with the back surface of the raised portion 37. A receiving portion 38 is formed that is formed by a curved surface that supports the drive body 3 in a swingable manner with the convex portion 25 as a swing center. Further, around this raised portion 37, four diaphragm portion insertion holes 39 are provided at equal angles in the circumferential direction in plan view.

  A ball 4 is sandwiched between the fitting groove 31 of the driving body 3 and the fitting groove 20a of the motor 2, and four compression coil springs are elastically mounted between the spring receivers 24 and 30. The ball 4 is pressed against the fitting groove 31 of the driving body 3 and the fitting groove 20a of the ceiling plate 20 of the motor 2 by the elastic force of 5 (only one compression coil spring 5 is shown).

  The diaphragm 6 is made of a flexible material such as rubber and is formed in a substantially positive direction in plan view as shown in FIG. 3, and four diaphragm portions 40 are provided at equal angles in the circumferential direction. A hole 41 is perforated at the bottom of the portion 40. A raised portion 42 having a cross-section raised in an arc shape protrudes from the central portion of the diaphragm 6, and the raised portion 42 is formed so as to be fitted to the raised portion 37 of the diaphragm holder 35 described above.

  In FIG. 1, reference numeral 45 denotes a valve holder. The valve holder 45 is formed in a flat and substantially rectangular parallelepiped shape, and a recess 46 formed in a circular shape in plan view is provided at the center of the upper surface. Is provided with a groove 47 formed in an annular shape in plan view. A concave fitting portion 48 is provided in the central portion of the concave portion 46, and a concave fitting portion 49 is provided in the central portion of the lower surface of the valve holder 45. The concave fitting portion 49 is formed in a mortar shape around the concave fitting portion 49. Further, four recessed fitting portions 50 are provided at equal angles in the circumferential direction.

  Reference numeral 51 denotes four discharge passages (only one discharge passage 51 is shown) provided at an equal angle in the circumferential direction, and is formed so as to communicate between the concave portion 46 and the concave fitting portion 50. Yes. Reference numeral 52 denotes four mounting holes (only one mounting hole 52 is shown) provided at equal angles in the circumferential direction, and is formed so as to penetrate between the groove 47 and the recessed fitting portion 50. A suction passage 53 is formed around each mounting hole 52 so as to communicate between the groove 47 and the recessed fitting portion 50.

  Reference numeral 55 denotes a lid formed in a flat and substantially rectangular parallelepiped shape. A presser portion 56 projects from the center portion of the lower surface, and a cylindrical portion 58 provided with a discharge port 57 is erected at the center portion of the upper surface. A cylindrical portion 60 provided with a suction port 59 is erected on the end portion side of the upper surface.

  In such a configuration, as shown in FIG. 1, in the diaphragm 6, the diaphragm portions 40 are inserted into the four diaphragm portion insertion holes 39 of the diaphragm holder 35, and the diaphragm 6 is formed on the raised portion 37 of the diaphragm holder 35. The raised portion 42 is placed.

  Each diaphragm portion 40 of the diaphragm 6 is fixed to the four convex portions 26 of the driving body 3 through screws 61 and retainers 62 that are screwed into the screw holes 27 of the driving body 3, thereby driving the diaphragm 6. It is integrated with the body 3 and is sandwiched between the valve holder 45 and the diaphragm holder 35. The four pump chambers 63 are formed by the diaphragm portions 40 and the recessed fitting portions 50 of the valve holder 45.

  The four attachment holes 52 of the valve holder 45 are fitted with suction valves 65 formed in an umbrella shape for opening and closing the suction passage 53. On the concave portion 46 of the valve holder 45, a discharge valve 66 formed in a substantially flat plate shape that opens and closes the discharge passage 51 pressed by the pressing portion 56 of the lid 55 is attached. The discharge port 57 and the pump chamber 63 are communicated with each other via the recess 46 of the valve holder 45 and the discharge passage 51. The suction port 59 and the pump chamber 63 are communicated with each other via the groove 47 of the valve holder 45 and the suction passage 53. The mounting base 22, the case 33, the diaphragm holder 35, the valve holder 45, and the lid body 55 are integrated by screws (all not shown) inserted through the respective insertion holes.

  Next, the operation of the diaphragm pump 1 having such a configuration will be described with reference to FIGS. 1 and 4. When an excitation current is supplied from the power source to the coil 16, the rotor 13 rotates about the shaft 19 as a rotation center, as in a normal motor. The ball 4 is pressed against the ceiling plate 20 of the rotor 13 and the drive body 3 by the elastic force of the compression coil spring 5, and the drive body 3 is regulated so as not to rotate around the convex portion 25, The ball 4 revolves while rotating with the rotation of the rotor 13 and moves along the fitting groove 31 of the driving body 3.

  At this time, as shown in FIG. 4, when the rotor 13 is moved by a distance L in the direction of arrow A, the ball 4 moves in the direction of arrow A while rotating in the counterclockwise direction in the figure, so that the ball 4 moves in the direction of arrow A. It moves by a distance L / 2 in the direction. That is, the moving speed v of the ball 4 with respect to the moving speed V of the rotor 13 is v = V / 2.

  Therefore, when the rotor 13 rotates halfway, the ball 4 revolves while rotating and rotates around the convex portion 25 along the fitting groove 31 of the driving body 3, so that the four diaphragm portions 40 of the diaphragm 6 are rotated. One of them moves upward as shown and contracts the pump chamber 63. Therefore, the fluid in the pump chamber 63 passes through the discharge passage 51 and is discharged from the discharge port 57 via the recess 46.

  Further, when the rotor 13 rotates halfway, the ball 4 revolves while rotating and rotates around the convex portion 25 along the fitting groove 31 of the driving body 3, so that the four diaphragm portions 40 of the diaphragm 6 are rotated. The next adjacent one of them moves upward and contracts the pump chamber 63 of the diaphragm section 40. Therefore, the fluid in the pump chamber 63 is discharged from the discharge port 57 through the discharge passage 51 and the recess 46. As described above, the expansion / contraction operation of the pump chamber 63 is sequentially performed in each pump chamber 63, so that the fluid discharged from each discharge passage 51 to the recess 46 is continuously discharged from the discharge port 57. .

  According to the diaphragm pump of the present invention, the ball 4 is brought into direct pressure contact with the ceiling plate 20 of the rotor 13 of the outer rotor type motor 2, so that the rotating plate that rotates integrally with the output shaft of the motor as in the prior art. The number of parts can be reduced, and the diaphragm pump 1 can be downsized.

  In the present embodiment, the suction valve 65 is formed in an umbrella shape and the discharge valve 56 is formed in a substantially flat plate shape. However, the suction valve 65 may be formed in a substantially flat plate shape. It may be formed in an umbrella shape or may be formed in a cylindrical shape, and various shape changes are possible.

It is the II sectional view taken on the line in FIG. The drive body of the diaphragm pump which concerns on this invention is shown, The figure (A) is a top view, The figure (B) is the II sectional view taken on the line (A), The figure (C) is a bottom view. The diaphragm of the diaphragm pump which concerns on this invention is shown, The same figure (A) is a top view, The same figure (B) is III (B) -III (B) sectional drawing in the same figure (A), The same figure (C) Is a bottom view. In the diaphragm pump according to the present invention, it is a schematic diagram for explaining the movement amount of the ball with respect to the movement amount of the rotor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 2 ... Outer rotor type motor, 3 ... Drive body, 4 ... Ball, 5 ... Compression coil spring (biasing means), 6 ... Diaphragm, 13 ... Rotor, 16 ... Coil, 20 ... Ceiling board, 20a ... fitting groove, 35 ... diaphragm holder, 51 ... discharge passage, 53 ... suction passage, 63 ... pump chamber, 65 ... suction valve, 66 ... discharge valve.

Claims (1)

An outer rotor type motor, and a drive body that is supported so as to be swingable so that the outer peripheral portion is spaced apart from and approaches the ceiling plate of the rotor, with the central portion as the swing center facing the rotor ceiling plate of the motor A diaphragm attached to the outer periphery of the drive body, a ball sandwiched between the outer periphery of the drive body and the ceiling plate of the rotor, and the ball between the drive body and the ceiling plate of the rotor Urging means for urging the driving body in a direction in which the driving body is pressed against each other by the outer peripheral portion, and the driving body is moved by the ball moving along with the ceiling plate of the rotor by rotating the rotor. A diaphragm pump characterized in that the diaphragm is pumped to perform a pumping action.

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