JP3876379B2 - Diaphragm pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small reciprocating pump using a diaphragm, that is, a small diaphragm pump.
[0002]
[Prior art]
As a conventional example of a diaphragm pump as in the present invention, for example, there is a pump described in JP-A-62-291484.
[0003]
This conventional diaphragm pump is configured as shown in FIG. In FIG. 2, 21 is a motor, 22 is an output shaft of the motor 21, 23 is a rotating plate fixed to the output shaft 22, 24 is a driving shaft that is eccentric to the rotating plate 23 and attached at a predetermined angle, Reference numeral 25 denotes an umbrella-shaped drive plate attached to the drive shaft 24 at the bearing portion 25a, 26 denotes a ball disposed at the tip portion of the drive shaft 24, and 27 denotes an integrally formed drive portion 27a. The diaphragm 27 is attached to the vicinity of the outer periphery of the drive plate 25. The diaphragm 27 has a bell-like shape with an opening upward. Reference numeral 28 denotes a cylinder body having a cylinder 28a into which the diaphragm part 27 is inserted, 30 denotes a pump chamber formed in a bell-shaped space part of the diaphragm part 28, and 31 denotes an integral part of the diaphragm part 27, for example. A cylindrical discharge valve, 32 is a valve chamber, 33 is a discharge port, 34 is a suction valve, 35 is a suction port, 36 is a case for housing the rotating plate 22, drive shaft 23, drive plate 25, etc. 37 is a discharge port , A lid body (valve housing) having a suction port and the like, by combining the case 36, the cylinder body 28, and the lid body 37 as shown in the figure, the diaphragm portion 27 and the discharge valve 31 are integrated by the cylinder 28 and the lid body 37. The diaphragm main body formed in the above is sandwiched and a pump is formed. In FIG. 3, two diaphragm portions 27 and two cylinders 28a are shown, but these may be three or more or one.
[0004]
In the conventional diaphragm pump having such a configuration, the rotating plate 23 is rotated by the rotation of the output shaft 22 driven by the motor 21. As the rotating plate 23 rotates, the driving plate 25 changes its inclination via the driving shaft 24. Due to the change of the driving plate 25, the driving portion 27a of the diaphragm portion 27 attached to the outer peripheral portion reciprocates in the vertical direction. The volume of the pump chamber 30 is increased or decreased by the reciprocating motion of the drive unit 27a, and the flow of the fluid into the pump chamber 30 by opening the suction valve 34 and the valve chamber 32 by opening the discharge valve 31 by increasing or decreasing the volume. The fluid flows out from the discharge port 33. That is, the pump action is performed.
[0005]
[Problems to be solved by the invention]
Such a diaphragm pump performs a pump action by increasing or decreasing the volume of the pump chamber 30 due to the reciprocating motion of the drive portion 27a of the diaphragm portion 27 forming the pump chamber 30, and for that purpose, the drive portion 27a of the diaphragm portion 27 is used. It is necessary to reciprocate at a necessary interval so that it works like a piston.
[0006]
In this way, the drive plate 25 requires a certain inclination angle to move the drive portion 27a of the diaphragm portion 27 in a reciprocating manner, and the peripheral portion thereof is moved up and down, so that the center of the pressing surface 25b of the drive plate 25 (reference numeral The portion indicated by A and hereinafter referred to as the drive center) needs to be positioned on the extension line of the rotation axis of the rotating plate 23 or in the vicinity thereof. Further, it is necessary to prevent the pressing surface 25b due to the vertical movement of the peripheral portion of the drive plate 25 from contacting the lower surface 28b of the cylinder 28a.
[0007]
For these reasons, the conventional diaphragm pump is formed such that the tip of the ball 26 and the drive shaft 24 is positioned on the bearing portion 25a side of the drive plate 25. The drive shaft 24 is loosely fitted to the bearing portion 25a so that it can move freely with respect to the drive plate 25. However, when the drive shaft 24 is loosely fitted to the bearing portion 25a of the drive plate 25 as described above, a slight rattling occurs, which causes a disadvantage that the operation of the pump becomes unstable.
[0008]
In order to solve this problem, the length of the drive shaft 24 is increased, and the fitting portion between the driving shaft 24 and the bearing portion 25a (the fitting portion between the fitting hole 25c of the bearing portion 25a and the driving shaft 24) is increased. It was necessary to stabilize the operation of the pump by increasing the length.
[0009]
Therefore, in the conventional diaphragm pump, the length of the drive shaft 24 is set to a certain length or more. When the length of the drive shaft 24 is increased in this way, the length in the vertical direction in FIG. 3 increases and the pump itself becomes large.
[0010]
The present invention provides a diaphragm pump configured to ensure a certain length so that the drive shaft can be stably operated and to reduce the size of the pump itself.
[0011]
[Means for Solving the Problems]
The diaphragm pump of the present invention forms a rotary plate rotated by a drive motor, a drive shaft fixed to the rotary plate by being eccentric and inclined, a drive plate attached to the drive shaft, and a pump chamber. A diaphragm main body having one or a plurality of diaphragm parts, a driving part integrally formed on the diaphragm part and attached to the driving plate, and a cylinder main body having a cylinder in which the diaphragm part is inserted and arranged, A pump that pumps by reciprocating the drive unit so that the tilt direction of the drive plate continuously changes through the drive shaft by the rotation of the rotary plate, and a convex portion near the drive center of the drive plate The projection is inserted into the space outside the cylinder of the cylinder body.
[0012]
In other words, the diaphragm pump of the present invention is provided with a convex portion on the drive plate so that a fitting hole formed in the bearing portion can be formed up to the convex portion without changing the length with which the drive shaft is fitted. The bearing part of the drive plate was shortened.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the diaphragm pump of the present invention will be described.
[0014]
FIG. 1 shows a first embodiment of a diaphragm pump according to the present invention. In FIG. 1, 1 is a motor, 2 is an output shaft of the motor 1, 3 is a rotating plate fixed to the output shaft 2, and 4 is A drive shaft 5 which is eccentric and inclined with respect to the rotary plate 3 is fixed, 5 is a drive plate having a bearing portion 5a attached to the drive shaft 4, 6 is a ball, 7 is a cylinder body having a cylinder 7a, 8 Is a diaphragm main body having a diaphragm portion 8a, 9 is a driving portion integrally formed with the diaphragm portion 8a, 10 is a pump chamber formed by the diaphragm portion 8a and the like, 11 is a discharge valve integrally formed with the diaphragm portion 8a, 12 is a common valve chamber, 13 is a discharge port communicating with the common valve chamber 12, 14 is a suction valve, and 15 is a suction port.
[0015]
In the pump of the first embodiment, a convex portion 5b that protrudes toward the cylinder 7a is formed on the extension portion of the drive shaft 4 of the drive portion 5 (in this embodiment, the central portion of the drive plate 5) and driven. The fitting hole 5c formed in the bearing part 5a of the plate 5 reaches the inside of the convex part 5b, and the ball 6 is arranged on the most cylinder side of the bearing hole 5b and the drive shaft 4 is fitted. It is a configuration. Thereby, even if the length of the drive shaft 4 is the same as the drive shaft 24 of the conventional diaphragm pump shown in FIG. 3, the position of the tip of the drive shaft 4 (the end surface in contact with the ball 6) is the bottom surface of the cylinder 7. Therefore, the length of the fitting portion of the drive shaft 4 (the length of the fitting hole formed in the bearing portion 5a of the drive plate 5 and the like) is shortened, for example, from the cylinder lower surface 7b. The distance up to 3 can be shortened, so that the length of the pump in the vertical direction in FIG. 1 can be shortened, and a small pump can be realized.
[0016]
That is, in the first embodiment, a convex portion 5b protruding from the drive plate 5 toward the cylinder body 7 is provided near the drive center of the drive plate 5 (indicated by B in FIG. 1). From the rotary plate 3 to the drive plate 5 with the fitting portion of the drive shaft 5 and the fitting hole 5c set to a predetermined length so that the fitting hole 5c formed in the portion 5a reaches the convex portion 5b. 5d, that is, the length from the rotary plate 3 to the cylinder 7a can be shortened. As a result, the length of the entire pump in the vertical direction of the drawing is reduced to reduce the size of the pump. Here, the convex portion 5b provided on the drive plate 5 is in the vicinity of the drive center B as described above, and the cross-sectional area is large enough to form a part of the fitting hole 5c in the convex portion 5b. It is desirable to make it small.
[0017]
In this type of diaphragm pump, since the diaphragm portion 8a is arranged on the circumference at a position close to the periphery of the pump, the outside of each cylinder 7a, which is the central portion of the cylinder body 7, is shown in FIG. Thus, the space 7c is sufficient to allow the central convex portion 5b of the drive plate 5 to be positioned. In particular, in the case of a pump having a large number of diaphragm portions, the space 7c is inevitably widened, and therefore the convex portion 5b is inserted without any special change.
[0018]
Further, when the number of diaphragm parts is small and there is not enough space between the two cylinders 7a, for example in the case of two diaphragm parts, the distance between the two cylinders 7a and the two diaphragm parts 8a is slightly increased. Yes.
[0019]
Depending on the purpose of use and place of use, the lateral direction is not limited so much, but when the vertical direction is required to be small, the space between the two cylinders is increased. That's fine.
[0020]
FIG. 2 is a diagram illustrating a configuration of a pump according to the second embodiment of this invention.
[0021]
The diaphragm pump of the second embodiment has substantially the same configuration as the pump of the first embodiment of FIG. 1, but the cylinder 7a into which the diaphragm portion 8a of the cylinder body 7 is inserted is directed downward. Therefore, the difference is that the wall surface 7d is inclined so that the area is small. Thus, the space 7c outside the cylinder on the lower surface side (motor side) of the cylinder 7a is formed to be large.
[0022]
That is, in the pump according to the second embodiment of the present invention, the shape of the cylinder 7a where the diaphragm portion 8a of the cylinder body 7 is located becomes narrower as it goes downward, and the cylinder body 7 without the cylinder 7a is present. A sufficiently large space 7c is formed in the central portion of the motor 1 and particularly on the side of the motor 1 and the rotary plate 3, and the convex portion 5b of the drive plate 5 is inserted into the space 7c. It can move within.
[0023]
As a result, the drive shaft 4 is maintained at a required length, that is, from the drive center B which is the center of movement of the drive shaft 4 while the length of the fitting portion of the drive shaft is kept sufficiently long. The length to the attachment part to the rotating plate 3 was made small, and the interval between the driving plate 5 and the rotating plate 3 was shortened, and the pump could be downsized.
[0024]
In particular, in the second embodiment, as shown in the drawing, the space 7c outside the cylinder on the lower surface of the cylinder 7 (the surface on the side of the rotating plate 3) is wide on the lower surface side toward the back of the cylinder 7 (upward in the drawing). The space on the lower surface side of the cylinder body 7 can be sufficiently widened so that the convex portion 5b formed at the tip end portion of the drive shaft 4 in the drive plate 5 can move sufficiently. Is secured. As a result, the length of the drive shaft 4 is set to a necessary and sufficient length, and the length of the fitting portion between the drive shaft 4 and the bearing portion 5a of the drive plate 5 is increased to ensure stable driving. The length from the diaphragm portion 8a to the surface to which the motor 1 is attached is significantly shorter than that of the conventional example, resulting in a smaller pump.
[0025]
The pump of the second embodiment is a pump having a large number of diaphragm portions and a large number of pump chambers. In addition to a pump having a large number of cylinders, the pump chamber may have a small number of cylinders such as two. Since the space 7c can be sufficiently wide, the convex portion of the drive plate can be disposed in the space 7c.
[0026]
Further, in the second embodiment of the present invention shown in FIG. 2, the inner shape of the cylinder 7a is also tapered so that the upper part is wide and the lower part is narrow. Therefore, the diaphragm portion 8a inserted and arranged here also has the shape. The shape is adapted to
[0027]
That is, in the first embodiment shown in FIG. 1, the diaphragm portion 8a has a bell shape. However, in the second embodiment of the present invention, the shape of the cylinder 7 is close to the shape of the tapered section. It has a certain tapered diaphragm.
[0028]
When the cylinder as in the second embodiment is tapered, if a bell-shaped diaphragm portion is used, there is a problem in fixing the diaphragm body, the durability of the diaphragm portion, etc., and the shape shown in the figure is desirable. .
[0029]
Further, when the diaphragm portion 8a is tapered as shown in FIG. 2, the side surface is inclined, and the drive portion 9 is moved up and down to indicate the pump action when the diaphragm portion 8a is pumped. The deformation of the portion is small compared to the deformation of the same portion of the bell-shaped diaphragm portion as in the first embodiment shown in FIG. 1 and the conventional example shown in FIG. 3, and the durability of the diaphragm portion 8a is large. This is preferable.
[0030]
Further, as shown in FIG. 2, the durability is further increased by increasing the inclination of the side surface of the diaphragm portion 8a compared to the shape of the cylinder so that a space is created in the portion indicated by the symbol D.
[0031]
In the diaphragm pump of the second embodiment described above, each cylinder has an inclined surface whose diameter decreases as it goes to the lower end on both the inner surface and the outer surface, but in FIG. 2, the outer surface of the cylinder body 7 on the space 7c side. Even if only the inclined surface is used, the space 7c can be made sufficiently large. Therefore, each cylinder 7a in FIG. 2 is tapered as shown only on its outer surface and the inner surface is cylindrical, or the outer surface is tapered only on the space 7c side, and the other portions are the same as in FIG. Even if the same cross section is formed to be parallel to the axis of the output shaft 2 and the inner side surface is cylindrical, the effect of widening the space 7c similar to that of the diaphragm pump of the second embodiment of the present invention can be obtained.
[0032]
In the pump of the second embodiment, when the inner surface of the cylinder 7a is cylindrical, the shape of the diaphragm portion 8a may be a bell shape or a tapered shape as illustrated.
[0033]
In the pumps of the first and second embodiments, only two pump chambers are shown, but of course, a pump having three or more pump chambers can be similarly configured. Furthermore, a pump having only one pump chamber may be used. When such a pump chamber is a single pump, the drive plate 5 does not have to be symmetrical about the drive shaft as shown in FIGS. 1 and 2, and the diaphragm portion 8a is formed from the drive shaft (bearing portion). An asymmetric shape in which the drive plate exists only on the existing side may be used. Also in this case, the effect of the present invention can be achieved by forming a convex portion protruding from the vicinity of the drive center toward the cylinder body.
[0034]
【The invention's effect】
In the pump of the present invention, a convex portion is provided in the drive center portion of the drive plate so that the convex portion is located in the space of the portion of the cylinder body where the cylinder is not disposed, thereby reducing the size of the pump. It has the effect of becoming possible.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the pump of the present invention. FIG. 2 is a diagram showing a second embodiment of the pump of the present invention. FIG. 3 is a diagram showing a conventional pump. ]
DESCRIPTION OF SYMBOLS 1 Motor 2 Output shaft 3 Rotating plate 4 Drive shaft 5 Drive plate 6 Ball 7 Cylinder 8 Diaphragm part

Claims (4)

One or more of a rotating plate rotated by a driving motor, a driving shaft fixed to the rotating plate by being eccentric and inclined, a driving plate attached to the driving shaft, and a diaphragm part forming a pump chamber A diaphragm main body, a driving part integrally formed on the diaphragm part and attached to the driving plate, and a cylinder main body having a cylinder in which the diaphragm part is inserted and arranged, and driven by the rotation of the rotating plate A pump that performs a pump action by continuously changing the tilt direction of the drive plate via a shaft to reciprocate the drive unit, and providing a projection near the drive center of the drive plate, the projection being the cylinder A bearing hole formed in a bearing portion of a drive plate to be positioned in a space formed outside the cylinder of the main body and to which the drive shaft is fitted is provided in the convex portion In a diaphragm pump as elongatable. 2. The diaphragm pump according to claim 1, wherein at least a side of the outer surface of the cylinder on which the convex portion is located is an inclined surface in which a cylinder lower end is inclined in a direction away from the convex portion. The diaphragm pump according to claim 1, wherein the cylinder is an inclined surface in which both the inner surface and the outer surface are inclined in a direction in which the diameter of the lower end becomes smaller. The diaphragm pump according to claim 3, wherein the shape of the diaphragm portion is smaller in diameter on the drive portion side than on the pump chamber side.

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