JP6483393B2 - Diaphragm pump - Google Patents

Description

  The present invention relates to a diaphragm pump that causes fluid to flow by reciprocating a diaphragm by a swinging motion of a swinging body.

  Conventionally, as a diaphragm pump for flowing a fluid using a diaphragm, for example, as shown in FIGS. 6 and 7, a plurality of diaphragm portions 106 forming a pump chamber 104 in a pump case 102 and a plurality of diaphragm portions 106 are provided. A device including a rocking body 108 to be supported and a rocking body driving mechanism 110 that rocks the rocking body 108 is known (Patent Documents 1 and 2). In this conventional diaphragm pump, the oscillating body 108 is oscillated by the oscillating body driving mechanism 110 to advance and retract the diaphragm portion 106 with respect to the pump chamber 104, and the volume of the pump chamber 104 is periodically changed to change the fluid flow. It is configured to perform inflow and outflow.

  As the oscillating body drive mechanism 110 for oscillating the oscillating body 108, various configurations have been conventionally used. For example, as shown in FIG. 6, the oscillator drive mechanism 110 described in Patent Document 1 includes a drive motor 112, a crank base 116 a fixed to the output shaft 114 of the drive motor 112, and an upper end portion of the output shaft 114. An inclined shaft 118a provided at a predetermined angle with respect to the output shaft 114 of the drive motor 112 so as to be positioned on the central axis. The inclined shaft 118a has a lower end portion provided on the crank table 116a and an upper end portion attached to a radially central portion of the rocking body 108 via a bearing (not shown) so as to be relatively rotatable.

  Further, as shown in FIG. 7, the oscillator driving mechanism 110 described in Patent Document 2 includes a drive motor 112, a crank base 116 b fixed to the output shaft 114 of the drive motor 112, and an upper end portion of the output shaft 114. An inclined shaft 118b provided at a predetermined angle with respect to the output shaft 114 of the drive motor 112 so as to be located on the central axis. The inclined shaft 118b is provided so as to penetrate the radial center portion of the rocking body 108, and an intermediate portion in the axial direction is fixed to the radial center portion of the rocking body 108. Further, the inclined shaft 118b is loosely fitted in a recess formed in the crank base 116b, and the upper end is loosely fitted in a recess formed in the pump case 102, whereby the crank base 116b and the pump case 102 are Is sandwiched between.

  In each of the oscillator driving mechanisms 110 described in Patent Documents 1 and 2, the crank bases 116a and 116b are rotated by the rotation of the output shaft 114 of the drive motor 112, and the inclined shafts 118a and 118b are inclined accordingly. In this state, the rocking body 108 is rotated around the upper end portion, and the rocking body 108 is configured to repeatedly perform rocking motion based on the principle of panning by the scrubbing motion of the inclined shafts 118a and 118b.

Japanese Patent Laid-Open No. 03-253781 JP 2002-89452 A

  By the way, in a small diaphragm pump, there are various design problems such as an excessive stroke difference between the outer periphery and the inner periphery of the diaphragm if a large driving stroke of the diaphragm is taken within a small outer diameter of the product. For this reason, the actual tilt angle of the tilt shaft in the conventional diaphragm pump is generally set to a small value of about 10 degrees.

  However, in the conventional diaphragm pump, in order to set the tilt angle of the tilt shafts 118a and 118b small, the tilt shafts 118a and 118b are used to prevent interference between the output shaft 114 of the drive motor 112 and the tilt shafts 118a and 118b. It is necessary to use a long bar member. For this reason, in the conventional diaphragm pump, there exists a problem that lengthening of a product cannot be avoided.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a small diaphragm pump capable of shortening the interval between the oscillator and the drive motor.

  A diaphragm pump according to the present invention includes a diaphragm constituting a part of a pump chamber, an oscillating body that moves the diaphragm forward and backward with respect to the pump chamber, and an oscillating body drive mechanism that oscillates the oscillating body, A diaphragm pump that repeats expansion and contraction of the pump chamber by oscillating the oscillating body by an oscillating body driving mechanism and moving the diaphragm forward and backward with respect to the pump chamber, wherein the oscillating body driving mechanism is driven A rocking body having a motor and a cylindrical inclined crank member having an outer peripheral surface inclined with respect to the output shaft of the drive motor and fixed around the output shaft so as to rotate together with the output shaft; Is inclined so that it can rotate relative to the circumferential direction of the outer peripheral surface of the inclined crank member and cannot move relative to the axial direction of the outer peripheral surface. Characterized in that it is configured to be mounted around the outer peripheral surface of the crank member.

  In the diaphragm pump according to the present invention, the inclined crank member has an inclined hole for inserting the output shaft in a direction obliquely intersecting a central axis thereof, and the output shaft is inserted into the inclined hole, thereby It is preferable to be configured to be attached around the output shaft in an inclined state with respect to the output shaft.

  Further, in the diaphragm pump according to the present invention, the rocking body has a mounting portion to which the inclined crank member is relatively rotatably attached to a central portion in a radial direction, and the rocking body driving mechanism includes the inclined crank It is preferable to further include a bearing member interposed between the outer peripheral surface of the member and the inner surface of the mounting portion of the rocking body.

  According to the present invention, the swinging body can be disposed around the output shaft of the drive motor via the inclined crank member, so that the interval between the swinging body and the drive motor can be shortened. A small diaphragm pump can be provided.

It is sectional drawing which shows schematic structure of the diaphragm pump which concerns on this embodiment. It is sectional drawing which shows the state which decomposed | disassembled the diaphragm pump shown in FIG. 3A is a plan view showing a state in which the diaphragm is viewed from the plane direction (pump head side), and FIG. 3B is a cross-sectional view taken along the line AA ′ of FIG. It is. It is the top view which looked at the oscillation body main part of an oscillation body from the plane direction (pump head side). It is sectional drawing which shows schematic structure of an inclination crank member. It is sectional drawing which shows schematic structure of the conventional diaphragm pump. It is sectional drawing which shows schematic structure of the diaphragm pump of the other conventional example.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

  As shown in FIG. 1, the diaphragm pump 1 according to the present embodiment includes a pump case 10, a diaphragm 20 constituting a part of a pump chamber 12 formed in the pump case 10, and an oscillating body that supports the diaphragm 20. 30 and a small pump including a rocking body drive mechanism 40 that rocks the rocking body 30. 1 and FIG. 2 is a cross-sectional view taken along the line BB ′ shown in FIG. 3A, and the oscillating body 30 shown in FIG. 1 and FIG. The cross-sectional view of the moving body 32) is a cross-sectional view taken along the line CC 'shown in FIG.

  As shown in FIGS. 1 and 2, the pump case 10 includes a pump head (manifold) 10 a in which a suction port 14 a and a discharge port 14 b project in parallel toward the front (upward in the drawing), and a diaphragm 20. A housing 10b that forms the pump chamber 12 and a diaphragm base 10c that holds the outer peripheral edge 20a and the inner peripheral edge 20b of the diaphragm 20 between the lower end edge of the housing 10b are provided. The housing 10b is formed with an inflow hole (not shown) for allowing the fluid (liquid or gas) flowing in through the suction port 14a to flow into the pump chamber 12, and the suction port has a suction port. A suction-side check valve 16a that allows the fluid flowing in through the pump chamber 12 to flow into the pump chamber 12 and restricts the fluid in the pump chamber 12 from flowing out is provided. The housing 10b is formed with an outflow hole (not shown) through which the fluid in the pump chamber 12 flows out toward the discharge port 14b, and the fluid in the pump chamber 12 flows out into the outflow hole. A discharge-side check valve 16b that restricts the flow of fluid from the discharge port 14b toward the pump chamber 12 is provided.

  As shown in FIGS. 2 and 3A, the diaphragm 20 is a diaphragm made of a soft material such as rubber, for example, and has a shape in which a circular opening 22 is formed in a disk-shaped central portion, that is, an annular shape ( Donut shape). The diaphragm 20 is provided so as to surround the movable portion 24 that is a portion that moves forward and backward with respect to the pump chamber 12 and the periphery of each movable portion 24, and is flexible to allow the movable portion 24 to move forward and backward by elastic deformation. A plurality of portions 26 are provided along the circumferential direction, three in the present embodiment. In the diaphragm 20 according to the present embodiment, the three movable parts 24 and the flexible parts 26 have the same shape and structure, respectively.

  As shown in FIG. 3A, the movable portion 24 has a shape extending along the circumferential direction of the diaphragm 20 in a plan view. In the present embodiment, the movable portion 24 has a substantially bowl-shaped shape with the circumferential direction of the diaphragm 20 as a longitudinal direction. In cross section, as shown in FIG. 3B, it has a substantially flat shape. As shown in FIGS. 3A and 3B, the movable portion 24 is formed with a through hole 25 at the center thereof for allowing the screw portion of the screw 36 to pass therethrough.

  As shown in FIG. 3A, the flexible portion 26 has a contour shape along the outer edge of the movable portion 24 so as to surround the periphery of the movable portion 24 in the plan view, in the circumferential direction of the diaphragm 20 in this embodiment. It has a substantially bowl-shaped contour shape extending along. The flexible portion 26 has at least a long side extending along the circumferential direction of the diaphragm 20. Specifically, the flexible portion 26 includes an arc-shaped outer edge portion 26a extending along the outer peripheral edge portion 20a of the diaphragm 20, an arc-shaped inner edge portion 26b extending along the inner peripheral edge portion 20b of the diaphragm 20, and an outer edge. It has a substantially bowl-shaped contour shape composed of semicircular coupling portions 26c and 26d that respectively connect the end portions of the portion 26a and the inner edge portion 26b. The outer edge portion 26a and the inner edge portion 26b have a length in the longitudinal direction that is longer than the length in the longitudinal direction of the connecting portions 26c and 26d, and the outer edge portion 26a is longer in the longitudinal direction than the length in the longitudinal direction of the inner edge portion 26b. It has a length. In addition, the flexible portion 26 has a mountain shape (that is, an inverted U-shaped cross section) that is convex in a direction facing the pump chamber 12 as shown in FIG. 3B in a cross-sectional view orthogonal to the longitudinal direction. It has a shape.

  As shown in FIG. 2, the oscillating body 30 is provided for each oscillating body main body 32 attached to the oscillating body driving mechanism 40 and each movable portion 24 of the diaphragm 20, and between the oscillating body main body 32, the diaphragm 20 A plurality of (three in this embodiment) pressing members 34 that sandwich and support each movable portion 24 are provided.

  The oscillating body 32 is rotatable relative to the circumferential direction of the outer peripheral surface 42b of the inclined crank member 42 and is not movable relative to the axial direction of the outer peripheral surface 42b. It is comprised so that it may attach to the circumference | surroundings of the outer peripheral surface 42b of 42. Specifically, as shown in FIGS. 2 and 4, the oscillating body 32 has a mounting portion 32 a formed at the central portion in the radial direction and a plurality of (outwardly extending in the radial direction from the mounting portion 32 a ( In this embodiment, three support arm portions 32b are provided. The attachment portion 32a is formed in a cylindrical shape having an inner diameter that can accommodate the oscillator driving mechanism 40. As shown in FIG. 4, the support arm portions 32 b are provided in the same number as the movable portions 24 of the diaphragm 20. That is, in this embodiment, the rocking body main body 32 has a three-pronged shape in which three support arm portions 32b are provided with a phase of 120 degrees. As shown in FIG. 2, the support arm portion 32 b has a length in the radial direction from the mounting portion 32 a to a position where the support arm portion 32 b is aligned with the movable portion 24 of the diaphragm 20, and the distal end portion 32 c is the diaphragm 20. It has a shape raised toward the movable part 24. The distal end portion 32 c has an upper surface 33 parallel to the movable portion 24 of the diaphragm 20, and a screw hole 32 d for screwing the screw portion of the screw 36 is formed. The upper surface 33 is formed in substantially the same shape and size as the movable portion 24 of the diaphragm 20, and is configured to be in contact with substantially the entire area of the lower surface of the movable portion 24.

  The pressing member 34 is formed in substantially the same shape and size as the upper surface 33 of the oscillating body 32 and is configured to be in contact with substantially the entire upper surface of the movable portion 24 of the diaphragm 20. As shown in FIG. 2, the pressing member 34 has a lower surface parallel to the movable portion 24 of the diaphragm 20, and is attached to the distal end portion 32 c of the support arm portion 32 b of the oscillating body 32 by screws 36. Thus, as shown in FIG. 1, the movable portion 24 of the diaphragm 20 is tightly held between the top surface 33 of the tip end portion 32c. As described above, the oscillating body 30 according to the present embodiment tightly holds the movable portion 24 of the diaphragm 20 between the upper surface 33 of the distal end portion 32c and the lower surface of the pressing member 34, whereby the upper surface of the distal end portion 32c. In the present embodiment, these surfaces are always parallel so that the relative angle between the lower surface of 33 and the pressing member 34 and the movable portion 24 of the diaphragm 20 does not change during driving.

  As shown in FIG. 2, the oscillator driving mechanism 40 has a drive motor 50 and an outer peripheral surface 42 b inclined with respect to the output shaft 52 of the drive motor 50. A cylindrical inclined crank member 42 fixed to the periphery, an outer peripheral surface 42b of the inclined crank member 42, and a bearing member 44 interposed between the inner surface of the mounting portion 32a of the rocking body 30 are provided.

  As shown in FIG. 5, the inclined crank member 42 has an inclined hole 42 a penetrating in a direction obliquely intersecting the central axis X from the upper surface to the lower surface. The inclined hole 42a has a diameter into which the output shaft 52 of the drive motor 50 can be inserted. As shown in FIG. 2, the inclined crank member 42 has an output shaft 52 of the drive motor 50 inserted into the inclined hole 42a, and is fixed to the output shaft 52 relatively unrotatably by a screw or the like (not shown). The outer peripheral surface 42 b is inclined with respect to the output shaft 52 and is configured to be attached around the output shaft 52.

  The bearing member 44 is provided between the outer peripheral surface 42b of the inclined crank member 42 and the inner surface of the attaching portion 32a of the oscillating body 30 in order to relatively rotate the inclined crank member 42 in the attaching portion 32a of the oscillating body 30. A pair of upper and lower sides are provided between them. 1 and 2, a ball bearing is illustrated as an example of the bearing member 44, but the present invention is not limited to this, and the inclined crank member 42 is relatively rotatably mounted in the mounting portion 32a of the oscillator 30. If it is possible, various bearing members can be employed.

  The oscillating body drive mechanism 40 having the above configuration rotates the inclined crank member 42 while being inclined with respect to the output shaft 52 as the output shaft 52 of the drive motor 50 rotates. The oscillating body 30 attached via the bearing member 44 is configured to repeatedly perform the oscillating motion based on the principle of panning by the scouring motion. Further, the oscillating body 30 according to the present embodiment is caused to oscillate by the oscillating body driving mechanism 40 to advance and retract the movable portion 24 of the diaphragm 20 with respect to the pump chamber 12, thereby expanding and contracting the pump chamber 12. It is configured to repeat. That is, in the diaphragm pump 1 according to the present embodiment, the rotational force of the drive motor 50 is converted into the movement of the oscillating body 30 in the oscillating direction, and the movable part 24 of the diaphragm 20 reciprocates in the advancing / retreating direction by the movement in the oscillating direction. The diaphragm 20 functions as a pump by the reciprocating motion of the diaphragm 20 in the advancing and retracting direction and the suction side check valve 16a and the discharge side check valve 16b provided in the pump case 10 in cooperation. It is configured to

  Further, as shown in FIG. 2, the oscillating body 30 according to the present embodiment includes the inclined crank member 42 and the bearing by attaching the inclined crank member 42 and the bearing member 44 of the oscillating body driving mechanism 40 in the attachment portion 32a. It is configured to be disposed around the output shaft 52 of the drive motor 50 via the member 44. That is, the diaphragm pump 1 according to the present embodiment is provided with the inclined crank member 42 and the bearing member 44 so as to surround the output shaft 52 around the output shaft 52 of the drive motor 50. The rocking body 30 is disposed so as to surround the periphery of the bearing member 44, and the output shaft 52, the inclined crank member 42, the bearing member 44, and the rocking body 30 have height levels (positions in the vertical direction in FIG. 2). It is comprised so that it may become comparable.

  Next, operation | movement of the diaphragm pump 1 which concerns on this embodiment is demonstrated. First, the tilting crank 42 is rotated by driving the drive motor 50 and rotating the output shaft 52. Further, with this rotation, the rocking body 30 disposed around the inclined crank 42 is rocked. When the inclined crank 42 is rotated, since the outer peripheral surface 42b of the inclined crank 42 is inclined with respect to the output shaft 52, the rocking body 30 is rotated along the circumferential direction and the vertical swing ( Oscillating). However, since the rotation of the oscillating body 30 along the circumferential direction is restricted by the circumferential rigidity of the diaphragm 20, only the vertical movement (oscillation) is taken out. Further, the movable portion 24 of the diaphragm 20 is reciprocated in the forward / backward direction with respect to the pump chamber 12 in accordance with the vertical swing (swing) of the swing body 30. The volume (in the pump chamber 12) is increased or decreased by the reciprocating motion of the movable portion 24 of the diaphragm 20, so that the fluid (liquid or gas) in the pump chamber 12 is compressed or expanded, and the suction-side check valve 16a and the exhaust check valve 16a are discharged. By the interaction of the side check valve 16b, the operation of pushing out the fluid and the operation of sucking in are alternately performed continuously.

  As described above, the diaphragm pump 1 according to the present embodiment includes the diaphragm 20 that constitutes a part of the pump chamber 12, the rocking body 30 that supports the diaphragm 20, and the rocking body drive mechanism 40 that rocks the rocking body 30. The diaphragm pump 1 is configured to repeat expansion and contraction of the pump chamber 12 by swinging the swing body 30 by the swing body driving mechanism 40 and moving the diaphragm 20 forward and backward with respect to the pump chamber 12. The drive mechanism 40 has a drive motor 50 and an outer peripheral surface 42b that is inclined with respect to the output shaft 52 of the drive motor 50, and is a cylindrical inclination fixed around the output shaft 52 so as to rotate together with the output shaft 52. And the oscillating body 30 is rotatable relative to the circumferential direction of the outer peripheral surface 42b of the inclined crank member 42, and the outer peripheral surface 42b. As to the axial direction becomes impossible relative movement are adapted to be mounted around the outer peripheral surface 42b of the inclined crank member 42.

  According to such a diaphragm pump 1, the rocking body 30 can be disposed around the output shaft 52 of the drive motor 50 via the inclined crank member 42, and the rocking body 30 is swung around the outer peripheral surface 42 b of the inclined crank 42. Since the moving body 30 is located and the output shaft 52 can be located in the radial direction so that the output shaft 52 is located inside the inclined crank 42, the output shaft 52 and the rotating shaft of the rocking body 30 do not interfere with each other, and the rocking motion is prevented. The distance (the dimension in the height direction of the product) between the moving body 30 and the drive motor 50 can be shortened, and thus the size can be reduced.

  Further, in the conventional diaphragm pumps described in Patent Documents 1 and 2, the eccentric amount of the crank stands 116a and 116b must be considerably small, so that a slight variation in the eccentric amount greatly affects the stroke of the diaphragm. There is a problem of doing. On the other hand, the diaphragm pump 1 according to the present embodiment employs a novel oscillating body drive mechanism 40 that is completely different from the conventional oscillating body drive mechanism that requires a crank base and an inclined shaft. It has the advantage that the problem of the conventional diaphragm pump does not arise.

  Furthermore, the conventional diaphragm pumps described in Patent Documents 1 and 2 have a problem that the inclined shafts 118a and 118b are long rod members and are easily damaged. On the other hand, according to the diaphragm pump 1 according to the present embodiment, since the novel oscillating body driving mechanism 40 that is completely different from the conventional oscillating body driving mechanism that requires the inclined shaft is employed, Compared to the drive mechanism, it has the advantage that it is not easily damaged.

  The diaphragm pump 1 according to the present embodiment can be used in various products, and its use is not limited. In particular, a small diaphragm pump such as an environmental measuring device, a blood pressure monitor, and an electric pot is required. It can use suitably with respect to the product made.

  The preferred embodiment of the present invention has been described above, but the technical scope of the present invention is not limited to the scope described in the above-described embodiment. Various modifications or improvements can be added to the above embodiments.

  For example, in the above-described embodiment, the inclined crank 42 has been described as having a simple cylindrical shape. However, the present invention is not limited to this. For example, a configuration in which the diameters of the pair of upper and lower bearing members 44 are different in the upper and lower directions, It is obvious that design variations other than a simple cylindrical shape can be considered, such as a configuration in which a fixing portion to the output shaft 52 of the drive motor 50 is added to 42.

  In the above-described embodiment, the bearing member 44 is described as being provided between the outer peripheral surface 42b of the inclined crank member 42 and the inner surface of the mounting portion 32a of the swinging body 30, but the present invention is not limited to this, and the inclined crank The bearing member 44 may not be provided as long as the oscillator 30 is attached around the member 42 so as to be relatively rotatable.

  Further, in the above-described embodiment, the inclined crank member 42 has been described as having the inclined hole 42a penetrating from the upper surface to the lower surface. However, the present invention is not limited to this, and the inclined hole 42a is directed from the lower surface toward the upper surface. It is good also as a recessed part extended diagonally.

  It is clear from the description of the scope of claims that the above modifications are included in the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 Diaphragm pump, 12 Pump chamber, 20 Diaphragm, 30 Oscillator, 32a attachment part, 40 Oscillator drive mechanism, 42 Inclined crank member, 42a Inclined hole, 42b Outer peripheral surface, 44 Bearing member, 50 Drive motor, 52 Output shaft

Claims (4)

A diaphragm constituting a part of the pump chamber, an oscillating body for moving the diaphragm forward and backward with respect to the pump chamber, and an oscillating body driving mechanism for oscillating the oscillating body, and the oscillating body by the oscillating body driving mechanism. Is a diaphragm pump that repeats expansion and contraction of the pump chamber by moving the diaphragm forward and backward with respect to the pump chamber,
The oscillator driving mechanism has a drive motor and a cylindrical inclined crank having an outer peripheral surface inclined with respect to the output shaft of the drive motor and fixed around the output shaft so as to rotate together with the output shaft. With members,
The outer periphery of the inclined crank member is configured such that the rocking body is rotatable relative to the circumferential direction of the outer peripheral surface of the inclined crank member and is not movable relative to the axial direction of the outer peripheral surface. A diaphragm pump characterized by being configured to be mounted around a surface. The inclined crank member has an inclined hole for inserting the output shaft in a direction obliquely intersecting with the central axis thereof, and is inclined with respect to the output shaft by inserting the output shaft into the inclined hole. The diaphragm pump according to claim 1, wherein the diaphragm pump is configured to be attached around the output shaft. The oscillating body has an attachment portion to which the inclined crank member is attached so as to be relatively rotatable at a central portion in a radial direction,
The mounting portion is formed in a cylindrical shape having an inner diameter capable of accommodating the inclined crank member,
The rocking body drive mechanism further includes a pair of upper and lower bearing members interposed between an outer peripheral surface of the inclined crank member and an inner surface of the mounting portion of the rocking body. 2. The diaphragm pump according to 2. The diaphragm is formed in an annular shape in which a circular opening is formed in a central portion, and a movable portion that moves forward and backward with respect to the pump chamber along a circumferential direction thereof, and surrounds the periphery of the movable portion. And a plurality of flexible portions having flexibility to allow the movable portion to move forward and backward with respect to the pump chamber.
  The movable part has a bowl-shaped shape with the circumferential direction as a longitudinal direction,
  The inclined crank member and the mounting portion of the rocking body are disposed in the opening of the diaphragm.
  The diaphragm pump according to claim 3.

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