JP2003148354A - Diaphragm pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the capacity of a pump chamber to increase pump delivery quantity while keeping the size of the whole body of a pump compact without changing it. SOLUTION: A diaphragm part for forming the pump chamber is formed to correspond to pump outer form at least at a part close to an outer wall of the pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm pump (rolling pump).

[0002]

2. Description of the Related Art A conventional diaphragm pump (rolling pump) having one or a plurality of diaphragm portions (pump chambers) has a structure as shown in FIGS.

In these FIGS. 4 and 5, 1 is a motor,
Reference numeral 2 is an output shaft of the motor 1, 3 is a case having a cup shape having substantially the same diameter as that of the motor 1, and a bottom surface is attached to a surface on the output shaft side of the motor 1, 4 is a collar fixed to the output shaft 2, 5 Is a drive shaft which is inclined to the output shaft 2 by a predetermined angle and is fixed to the collar 4 so that its tip is on the central axis of the output shaft 2, 6 is a disk-shaped drive body, and 7 is A cylinder portion, 8 is a diaphragm body made of an elastic material such as soft rubber, 9 is a bell-shaped (cup-shaped) diaphragm portion formed integrally with the diaphragm body,
Reference numeral 10 is a drive portion (piston) integrally formed with the lower end portion of the diaphragm portion 9, and 11 is a cylindrical valve body portion (discharge valve) integrally formed with the diaphragm body 9 near the center thereof. . Further, 12 is a lid, 13 is a lid 12
Is a discharge port communicating with a common chamber (valve chamber part) 14 provided in the valve body 11, a suction valve 15 and a suction port 16.

As shown in the figure, the diaphragm pump of this conventional example is a combination of a case 3 for accommodating a drive mechanism composed of an output shaft 2, a drive shaft 5, a drive body 6 and the like, and a cylinder portion 7, and a cylinder portion 7 and a lid. The diaphragm body 8 is sandwiched by the body 12 to form a pump. The diaphragm 9 and the lid 12 form a pump chamber 17.

Next, the operation of the conventional diaphragm pump shown in FIGS. 4 and 5 provided with the two diaphragm portions (pump chambers) thus constructed will be described. When the motor 1 is energized and the output shaft 2 rotates, the drive shaft 5 also rotates, which causes the drive body 6 to perform a dish-turning motion, and the drive units 10 of the respective diaphragm portions 9 alternate in the vertical direction with a phase difference of 180 degrees. Reciprocates. The volume of the pump chamber 17 changes periodically due to the piston movement of the drive unit 10 of the diaphragm unit 9. When the drive unit 10 moves downward and the volume increases like the diaphragm unit 9 on the right side in FIG. 4, the pump chamber 17 is decompressed and the valve body unit 11 is in close contact with the valve chamber unit 14 to close the intake valve. 15 is opened and air flows in through the suction hole 16 as indicated by arrow A. Next, when the drive unit 10 moves upward and the volume of the pump chamber 17 decreases, the pressure of the pump chamber 17 is increased and the suction valve 15 is brought into close contact with the lid 12 to be closed. The valve 11 is opened at the portion that closes the groove 12a of the pump chamber 17, and the air in the pump chamber 17 is discharged from the discharge port 13 through the groove 12a and the common chamber 14 as shown by arrow B.

In this conventional diaphragm pump, the two diaphragm portions repeat the above-mentioned movements with a constant phase difference, so that air is sucked through the respective suction ports 16 and passes through the common chamber (valve chamber portion) 14. It is discharged from the discharge port 13 and thereby acts as a pump.

In FIG. 4, the drive unit 10 of the right diaphragm unit 9 of the two diaphragm units 9 is at the lowest position (bottom dead center), and the drive unit 1 of the left diaphragm unit 9 is shown.
0 is at the top (top dead center). On the other hand, in FIG. 5, the phase is 18
The state is shifted by 0 degree, and the right side shows the top dead center and the left side shows the bottom dead center.

In the conventional diaphragm pump (rolling pump) described above, the shape of the diaphragm portion changes when the pump is driven. For example, in the diaphragm portion 9 on the right side shown in FIG. 5, the drive portion 10 is at the bottom dead center of the lowermost position,
The drive portion 10 of the left diaphragm portion 9 is at the uppermost dead center. As is apparent from FIG. 5, the shape of the diaphragm portion on the right side of the bottom dead center and the shape of the diaphragm portion on the left side of the top dead center are greatly different, and particularly the portion indicated by 18 is greatly different. That is, the driving of the pump causes the shape of the portion 18 of the diaphragm portion 9 to change greatly, and therefore the durability of the portion 18 of the diaphragm portion cannot be maintained.

There is a diaphragm pump described in Japanese Patent Application Laid-Open No. 2001-082341 proposed by the inventor of the present invention to solve this drawback.

As shown in FIG. 6, this diaphragm pump has a different diaphragm shape. Particularly, the above-mentioned 18 part of the diaphragm 9 is shown in FIG.
By changing the shape of the portion indicated by reference numeral 20 in the figure to the shape shown in the figure, the change in the shape of the diaphragm portion during driving of the pump is reduced, and the durability of the diaphragm portion is increased.

That is, in the diaphragm pump shown in FIG. 6, the shape of the diaphragm portion is a bell shape (cup shape) as shown in the drawing, and the vicinity of a portion connected to the drive portion (piston) (indicated by 20). (Part) is a tapered surface, that is, a straight line with a slanted sectional shape or a gentle curved shape, which reduces the deformation of the diaphragm part when the drive part makes a reciprocating motion as described above, and improves the durability. Become.

[0012]

The conventional diaphragm pumps described above each have one or a plurality of diaphragm portions (pump chambers), and the arrangement of the diaphragm portions in the diaphragm body is shown in FIG. 1 (B), respectively. , Fig. 2
(B) and FIG. 3 (B). Of these,
1 (B) and 2 (B) show two examples of the diaphragm portion, and FIG. 3 (B) shows three examples of the diaphragm portion. That is, the diaphragm portion is cup-shaped as shown in FIGS. 4, 5, and 6, and the shape viewed from above is the same as that of FIG.
It has a circular shape as shown in (B), FIG. 2 (B), and FIG. 3 (B).
Moreover, as described above, in order to fix the drive part (piston) of the diaphragm part to the disk-shaped drive body and to secure the reciprocating motion of a certain distance, it is necessary to arrange it in the peripheral part thereof.
Furthermore, due to structural restrictions such as the provision of a common cylindrical valve in the center, the degree of freedom in the location of the diaphragm is small,
There are certain restrictions.

For these reasons, there is a certain limit in increasing the cross-sectional area of the cup-shaped diaphragm (the area of the circle shown in FIG. 1B) while keeping the pump small. Therefore, it is difficult for the conventional diaphragm pump to increase the volume of the pump chamber and increase the discharge amount.

The present invention provides a diaphragm pump capable of increasing the cross-sectional area of the diaphragm while keeping the size of the pump small, thus increasing the volume of the pump chamber and increasing the discharge amount.

[0015]

DISCLOSURE OF THE INVENTION A diaphragm pump according to the present invention is arranged in a collar fixed to an output shaft of a motor and rotated by driving the motor, and inclined to the collar (inclined to the output shaft of the motor). Drive shaft, a drive member rotatably attached to the drive shaft, a cup-shaped diaphragm portion forming one or a plurality of pump chambers, and one end driven integrally with each diaphragm portion. It is equipped with a drive unit (piston) attached to the body, the drive shaft changes its inclination direction by the rotation of the collar by the drive of the motor, and the drive unit is moved by the movement of the drive unit based on the change in the inclination direction of this drive shaft. A pump that reciprocates to perform a pumping action, characterized in that the diaphragm portion has a shape conforming to the external shape at least in a portion near the outer wall of the pump. .

In the diaphragm pump of the present invention, since the diaphragm portion is shaped as described above, at least near the outer wall of the pump as compared with the conventional diaphragm pump in which the diaphragm portion has a circular shape in the cross-sectional direction. It is possible to increase the area of the section in the cross-sectional direction, the volume of the pump chamber can be increased, and as a result, the discharge amount of the pump can be increased.

Another diaphragm pump of the present invention is characterized in that the diaphragm portion has the above-mentioned structure and further has a continuous curved surface shape in the vicinity of the connecting portion of the diaphragm portion with the driving portion.

As described above, by forming a gentle curved surface in the vicinity of the connecting portion of the diaphragm portion with the drive portion, the pump action, that is, the deformation amount of the diaphragm due to the reciprocating movement of the drive portion can be made small, and the reciprocating movement can be reduced. The movement can be performed smoothly and the durability of the diaphragm portion can be increased.

In these diaphragm pumps of the present invention, the volume of the pump chamber is increased by forming at least the portion of the diaphragm portion near the outer wall of the pump so as to conform to the appearance of the pump. It is possible to further increase the volume of the pump chamber by making the shape other than the arc shape.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a diaphragm pump of the present invention will be described with reference to the drawings.

The first embodiment of the diaphragm pump of the present invention has two diaphragm parts, and the drive mechanism and other overall constitutions are substantially the same as those of the conventional diaphragm pump shown in FIGS. Although the same, the diaphragm portion constituting the pump chamber is as shown in FIG. 1 (A), which is different from the conventional example of FIG. 1 (B).

That is, the structure of the entire pump is as shown in FIGS. 4 and 5 which are conventional examples. In the pumps shown in these drawings, the view seen from above the diaphragm portion is as shown in FIG. is there.

As described above, in the diaphragm pump according to the first embodiment of the present invention, the shape of the diaphragm portion 31 from above is not circular but is long in one direction (vertical direction in the drawing), and therefore its sectional shape is also. As a whole, it has a long oval shape on one side. Reference numeral 32 indicates a drive unit.

As described above, in the diaphragm pump of the present invention, the outer wall side of the diaphragm portion 31 has a shape along the rectangular side of the appearance of the pump.
Compared with the conventional example of (B), at least the diameter in the vertical direction in the drawing is large, while the diameter in the horizontal direction in the drawing is substantially equal, and the area of the diaphragm portion 31 from above is the area of the diaphragm portion in the conventional example. Since it is larger than the present invention and is larger in almost all cross sections, the volume of the pump chamber is greatly increased. As a result, the discharge amount of the pump also becomes large.

The above description has been made on the example of applying the diaphragm portion of the present invention to the diaphragm portion in the conventional diaphragm pump shown in FIGS.
In the diaphragm pump shown in (1), the diaphragm portion according to the present invention can be applied to the diaphragm portion, whereby the volume of the pump chamber can be greatly increased and the discharge amount can be increased. Further, FIG.
The diaphragm pump shown in Fig. 2 is configured so that the vicinity of the connecting part of the diaphragm part with the drive part is tapered or has a gentle curved surface, and therefore there is little change in shape during pump action (reciprocating motion of the drive part). It enables smooth movement and is preferable for durability.

FIG. 2 shows a second embodiment of the present invention. Similar to FIG. 1, (A) shows a view from above the diaphragm portion in the present invention, and (B) shows a diaphragm in a conventional example. The figure is shown from above the part.

The diaphragm portion 33 of this embodiment is
The pump has a substantially square shape, and has a larger area at least at four corners than the circular diaphragm portion of (B), so that the volume of the entire pump chamber increases. As a result, the discharge amount of the pump also increases. Reference numeral 34 is a drive unit.

The diaphragm portion of the present invention of this embodiment may employ either of the diaphragms shown in FIGS. 4, 5 or 6 as the basic structure.

In the case of the second embodiment, the deformation of the four corners of the square becomes larger when the pump action is performed. For this reason, it is preferable that the vicinity of the connecting portion with the drive portion is tapered or the like as shown in FIG.

FIG. 3 shows a third embodiment of the present invention, in which the present invention is applied to a diaphragm pump having three pump chambers. Similar to FIGS. 1 and 2, FIG. 3 shows (A) the diaphragm portion 3 according to the present invention.
5 is a view as seen from above, and FIG. 5B is a view as seen from above the diaphragm portion of the conventional diaphragm pump. still,
Reference numeral 36 is a drive unit.

The third embodiment has the three pump chambers as described above, and the vicinity of the outer wall of the pump is deformed into a shape according to the external appearance, and the inner portion of the pump is also shown in FIG. By making the shape different from the circular shape as shown in FIG. 3 (B), the cross-sectional area of the diaphragm portion was made large and the volume of the pump chamber was made large, and therefore, the discharge amount of the pump was made large.

In the third embodiment, the change from the circular shape is large, and therefore the deformation during the pump action (the reciprocating motion of the driving portion) is relatively large, and particularly in the vicinity of the connecting portion with the driving portion. Deformation becomes large. Therefore, it is preferable to apply the present invention to a pump such as the diaphragm pump shown in FIG. 6 in which the connecting portion with the driving portion has a tapered shape or a gentle curved surface.

In the diaphragm pump of the present invention, as shown in each of the above embodiments, the shape of the diaphragm portion is close to the outer wall of the pump and conforms to the external appearance of the pump. Further, for example, as in the third embodiment, the shape other than the portion close to the outer wall is deformed from the circular shape to increase the volume of the pump chamber and increase the discharge amount of the pump, which is the object of the present invention. It is possible.

Therefore, in the inner part of the pump,
By deforming the cross-sectional shape of the diaphragm portion from a circular shape so as not to affect members other than the diaphragm portion, it is possible to increase the cross-sectional area and increase the volume of the pump chamber.

Further, in the diaphragm pump of the present invention, the shape of the diaphragm portion viewed from above is not circular, so that the shape in the vicinity of the connecting portion with the driving portion at the top dead center is greatly deformed. Therefore, it is desirable that the shape of the portion of the diaphragm portion connected to the drive portion is a tapered surface or a surface having a gentle curved surface as in the pump shown in FIG. Further, the cross-sectional shape of the diaphragm of the present invention is a typical example shown in each embodiment, and the cross-sectional shape is as wide as possible within the position where other members of the pump are arranged and the range in which reciprocation is possible. Therefore, various cross-sectional shapes can be adopted. Therefore, in addition to the taper shape shown in FIG. 6 or a shape similar thereto, the connecting portion of the diaphragm portion to the driving portion is closer to the diaphragm portion than the driving portion peripheral portion in the vicinity of the connecting portion to the driving portion depending on the sectional shape of the diaphragm portion. It is preferable that the shape is a shape in which the amount of deformation at the top dead center is relatively small, such as a shape that is continuous with a gentle curved surface.

[0036]

In the diaphragm pump of the present invention, the volume of the pump chamber is increased and the discharge amount of the pump is increased by making the shape of the diaphragm portion forming the pump chamber conform to the appearance of the pump. is there.

[Brief description of drawings]

FIG. 1 is a plan view showing a diaphragm portion of a first embodiment of the present invention in comparison with a conventional example.

FIG. 2 is a plan view showing a diaphragm portion according to a second embodiment of the present invention in comparison with a conventional example.

FIG. 3 is a plan view showing a diaphragm portion of a third embodiment of the present invention in comparison with a conventional example.

FIG. 4 is a diagram showing an overall configuration of a conventional diaphragm pump.

FIG. 5 shows a drive unit of the diaphragm pump shown in FIG.
The figure which shows the state rotated by 80 °

FIG. 6 is a diagram showing an overall configuration of another conventional diaphragm pump.

[Explanation of symbols]

31, 33, 35 Diaphragm part 32, 34, 36 Drive unit (piston)

Claims (2)

[Claims] 1. A collar rotated by driving a motor, a drive shaft inclined to the collar, a drive member rotatably attached to the drive shaft, and at least one diaphragm portion. A driving unit having one end attached to the driving body and provided in the diaphragm unit; and a pump chamber formed by the diaphragm unit, and the tilt direction of the driving shaft changes due to rotation of the collar A diaphragm pump in which the drive section reciprocates by the movement of the drive body to perform a pumping action, and at least a portion of the diaphragm section near the outer wall of the pump conforms to the external shape. 2. The diaphragm pump according to claim 1, wherein the diaphragm portion has a gentle curved surface shape as a whole at least in the vicinity of a connecting portion with the driving portion.