JP2003239866A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve easiness in cleaning of a pump chamber formed between a recessed part of a flange part and a diaphragm. <P>SOLUTION: A body 22 is provided with the diaphragm 25, the flange part 24, and a manifold 28 so as to constitute a pump part 23. The pump parts 23 and 23' are provided symmetrically right and left. The pump chamber 27 is formed between the recessed part 24a of the flange part 24 and the diaphragm 25, and a protruding part 28a of the manifold 28 is fitted into a bottom opening part 24b of the recessed part 24a. Four inlet and outlet holes 34 working as an inlet and an outlet for communicating a halfway part of a liquid passage 29 with the pump chamber 27 are provided in the manifold 28. The inlet and outlet holes 34 are formed and extend so as to be tilted about 30° to an outer peripheral side with respect to an axial direction from a central part of the flange part 24 on an outer surface side, and tilted about 5° to a radial direction. Thus, paint is suctioned and delivered while a rotating stream is generated in the pump chamber 27. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm pump that sucks and discharges liquid into a pump chamber by displacing the diaphragm.

[0002]

For example, a diaphragm pump 1 as shown in FIG. 8 is provided as a pump for transferring (pressurizing) the coating material to a coating device (spray gun). The diaphragm pump 1 has first and second pump parts 2 and 2'symmetrically (hereinafter, a member equivalent to the first pump part 2 in the second pump part 2'is , And the common code is to be added with “′”). Among them, in the first pump portion 2 on the left side in the drawing, the diaphragm 5 is provided between the body 3 and the flange portion 4 such that the outer peripheral portion thereof is sandwiched.

A circular (spherical) recess 4a is formed on the inner surface of the flange 4, and a pump chamber 6 is formed between the recess 4a and the diaphragm 5. A paint passage 7 extending in the vertical direction is formed on the outer side of the flange portion 4, and the central portion of the paint passage 7 and the central portion of the concave portion 4a (pump chamber 6) are connected to the inlet / outlet hole 4.
It is connected by b. The lower end of the paint passage 7 is connected to the left end of a suction pipe 8 extending in the left-right direction, and a suction valve 9 including a valve seat, a valve ball and the like is provided at this portion. The upper end of the paint passage 7 is connected to the left end of a discharge pipe 10 extending left and right, and a discharge valve 11 including a valve seat, a valve ball, and the like is connected to this end.
Is provided.

On the other hand, the second pump portion 2'also has a flange portion 4 ', a diaphragm 5', a pump chamber 6 ', and a paint passage 7', and the lower end portion of the paint passage 7'is of the suction pipe 8. The suction valve 9'is connected to the right end portion, the suction valve 9'is provided in this portion, the upper end portion of the paint passage 7'is connected to the right end portion of the discharge pipe 10, and the discharge valve 11 'is provided in this portion. A suction port 8a connected to a paint supply source is provided in the center of the suction pipe 8, and the discharge pipe 1
A discharge port 10a connected to a spray gun (not shown) is provided at the center of 0. The diaphragms 5 and 5'are connected by a shaft 12 penetrating the body 3 in the left-right direction, and are reciprocally moved by a predetermined stroke in the left-right direction in the drawing by an air driving mechanism (not shown).

As a result, as shown in FIG. 8A, when the diaphragms 5 and 5'are displaced rightward integrally with the shaft 12, the paint is sucked into the pump chamber 6 by the first pump portion 2. At the same time, the paint is discharged from the pump chamber 6'in the second pump portion 2 '. On the other hand, as shown in FIG.
When the diaphragms 5 and 5'are displaced to the left integrally with the shaft 12, the paint is discharged from the pump chamber 6 by the first pump portion 2 and the paint is sucked into the pump chamber 6'by the second pump portion 2 '. To be done. In this way, in the first and second pump portions 2 and 2 ', the paint suction process and the paint discharge process are alternately performed in an inverse relationship, and the paint is continuously transferred.

By the way, when the type (color) of the paint used for coating is changed, for example, by using a cleaning liquid such as thinner, the inside of the diaphragm pump 1 (the pump chamber 6,
6 ', paint passages 7, 7', suction pipe 8, discharge pipe 1
It is necessary to switch to a new paint after cleaning (0, etc.). In this case, cleaning is performed by driving the pump while supplying the cleaning liquid to the suction port 8a side.

However, in the conventional diaphragm pump 1 described above, the flow of the liquid in the pump chambers 6 and 6'is not particularly good, and therefore, the stagnation of the paint in the portion where the flow is poor, and thus the gel. It easily solidifies and solidifies,
Further, since the cleaning liquid does not flow well, there is a problem that it takes a long time and a large amount of cleaning liquid is required to completely clean the inside of the pump chambers 6 and 6 '.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a diaphragm pump capable of improving the cleanability of a pump chamber formed between a recess of a flange portion and a diaphragm. It is in.

[0009]

DISCLOSURE OF THE INVENTION A diaphragm pump of the present invention is a diaphragm pump in which a pump chamber is formed between a circular recess or a circular-shaped recess provided in a flange portion and the diaphragm. It is characterized in that the liquid inlet hole and the liquid outlet hole that are opened inside are opened at a position displaced from the center of the pump chamber toward the outer peripheral side in a form inclined with respect to the radial direction (claim 1 Invention).

According to this, when the liquid is sucked into the pump chamber, the liquid sucked from the inlet hole is sucked so as to generate a rotational flow in the pump chamber, and when the liquid is discharged, the liquid is also rotated in the pump chamber. A flow is generated so that it is discharged from the outlet hole. Therefore, the flow of the liquid in the pump chamber is improved, the liquid such as paint is less likely to stay, and the flow of the cleaning liquid is improved. As a result,
It is possible to improve the cleaning performance of the pump chamber, and it becomes possible to perform cleaning in a short time with a small amount of cleaning liquid.

It should be noted that the term "circular shape or shape similar to a circle" as used in the present invention is a general term for a circular shape, an elliptical shape and the like, but it does not necessarily mean only a strict circular shape or an elliptical shape, but is slightly distorted. It may be circular or elliptical, may have a straight line part of its peripheral edge, or may be polygonal, such as an octagon, which is close to a circle. The point is that the liquid creates a rotating flow in the pump chamber. Any shape will do.

More specifically, a plurality of holes, which also serve as an inlet hole and an outlet hole, are formed in the flange portion so as to extend from the center portion on the outer surface side of the flange portion so as to be inclined with respect to the axial direction and to have a diameter. It can be provided so as to be inclined with respect to the direction and open in the recess (the invention of claim 2). According to this, a swirling liquid flow is formed in the pump chamber, and the cleaning performance of the pump chamber can be made extremely excellent.

Further, the flange portion is provided with an inlet hole and an outlet hole extending substantially in the circumferential direction, respectively, and sucking and discharging the liquid in the pump chamber in the same direction with respect to the rotational direction. Yes (invention of claim 3),
Alternatively, the inlet hole and the outlet hole may be provided so as to extend in a direction substantially along the circumferential direction, respectively, and suction and discharge of the liquid in the pump chamber may be performed in opposite directions with respect to the rotation direction (the invention of claim 4). ).

In either case, since the liquid is sucked and discharged substantially tangentially in the pump chamber, a rotary flow is effectively generated, and the pump chamber can be cleaned very well. be able to. By the way, according to the test on the cleaning property carried out by the present inventor, it was found that, in any of the configurations, a significantly better cleaning property was obtained as compared with the conventional one, but the suction and the discharge of the liquid with respect to the rotation direction. Better results were obtained with the same direction. Further, even in the case where the inlet hole and the outlet hole described above are used in common and a swirling liquid flow is formed, the same good cleaning property as that can be obtained.

Further, when the surface of the recess of the flange portion is coated with a fluororesin such as Teflon (registered trademark) (invention of claim 5), liquid such as paint adheres to the surface of the recess. Since it becomes difficult, the cleaning performance of the pump chamber can be further improved. In the present invention, the material of the diaphragm is not limited at all, but it goes without saying that the diaphragm may be made of fluororesin.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Several embodiments in which the present invention is applied to a pump for transferring (pressurizing) a coating material as a liquid in a coating system will be described below with reference to FIGS. 1 to 7. . (1) First Embodiment First, a first embodiment of the present invention (corresponding to claims 1 and 2) will be described with reference to FIGS.

FIG. 1 schematically shows the overall construction of a diaphragm pump 21 according to this embodiment. A body 22 is arranged at the center of the diaphragm pump 21,
The body 22 is provided with a through hole 22a penetrating the center of the body 22 in the left-right direction in the drawing, and circular recesses 22b, 22b 'are formed on the left and right side surfaces. The diaphragm pump 21 is configured such that the left and right parts of the body 22 have first and second pump parts 23, 23 'symmetrically. The second pump portion 23 '
Members (parts) equivalent to those of the first pump unit 23 in FIG.

The first pump unit 23 on the left side of the figure
In the above, the flange portion 24 is attached by screwing to the left side surface portion of the body 22 in the figure, and a substantially circular diaphragm 25 made of synthetic resin (for example, nylon) is provided between them. , Are provided so as to sandwich the outer peripheral edge portion. Further, a central portion of the diaphragm 25 is provided with a shaft 26 provided so as to penetrate the through hole 22a of the body 22 in an airtight and slidable manner.
Is connected to the left end of.

At this time, the flange portion 24 has a circular recess 24a formed on the inner surface (right side in the drawing), and a pump chamber 27 is formed between the recess 24a and the diaphragm 25. . In this case, the recess 24a
Has a circular flat surface portion on the bottom surface thereof and a tapered surface portion on the outer periphery thereof. In the present embodiment, a circular opening is formed in the central portion of the bottom surface (circular flat surface portion) of the recess 24a. The part 24b is formed. Further, a deformable space is secured by the recess 22b of the body 22 on the right side of the diaphragm 25 in the figure, so that the pump chamber 27 is reciprocally displaced in the left-right direction in the figure.
Intake process for sucking liquid (paint) into the inside, and pump chamber 27
And a discharge step of discharging the liquid (paint) inside.

On the outer surface (left side surface in the drawing) of the flange portion 24, a manifold 28 as shown in FIG. 2 is also provided.
Are attached by screwing or the like. A liquid passage 29 extending in the vertical direction is formed in the manifold 28, and a suction valve 30 which is a check valve including a valve seat, a valve ball, a ball guide and the like is incorporated in a lower end portion of the liquid passage 29. A discharge valve 31, which is a similar check valve, is incorporated in the upper end of the liquid passage 29.

Further, the lower end of the manifold 28 (liquid passage 29) is connected to the left end of a suction pipe 32 extending in the left-right direction at the lower portion of the body 22, and is connected to the upper end of the manifold 28 (liquid passage 29). Is the body 22
The left end of a discharge pipe 33 extending in the left-right direction at the upper part of is connected. The suction pipe 32 is provided with a suction port 32a so as to be connected to a paint supply source (not shown), and the discharge pipe 33 has a discharge port 33a.
a is provided and is connected to a coating device (spray gun) not shown.

Now, in the manifold 28, the middle portion of the liquid passage 29 and the concave portion 24 of the flange portion 24 are provided.
In this case, there are provided a plurality of, for example, four inlet / outlet holes 34 for communicating with the inside (a) of the pump chamber 27, which are also inlet holes and outlet holes in this case. That is, as shown in FIGS. 2 and 3, the right side wall portion of the manifold 28 in the drawings is integrally provided with a circular convex portion 28a which is convex to the right by a slight amount, and the flange portion 24 is formed. When it is attached to the
8a is fitted in the opening 24b of the flange 24 in a liquid-tight manner from the outside.

In the manifold 28, four inlet / outlet holes 34 are provided at 90 ° intervals in the circumferential direction so as to extend from the liquid passage 29 and open at the tip end surface of the convex portion 28a. Each of the inlet / outlet holes 34 is inclined from the center portion on the outer surface side of the flange portion 24 to the outer peripheral side with respect to the axial direction by, for example, about 30 ° (see FIG. 2 (a)), and slightly in the radial direction. Only (for example, about 5 ° in the counterclockwise direction in FIGS. 2B and 3), the opening extends slightly outward from the center of the recess 24a (pump chamber 27) of the flange 24. It is formed to do so.

On the other hand, also in the second pump portion 23 ', the flange portion 24' having the recess 24a 'and the opening 24b', the diaphragm 25 ', the pump chamber 27', the liquid passage 29 'and the suction valve 30' and A manifold 28 'having a discharge valve 30' is provided, the lower end of the liquid passage 29 'is connected to the right end of the suction pipe 32, and the upper end of the liquid passage 29' is connected to the right end of the discharge pipe 33. ing. Further, the manifold 28 'is provided with a circular convex portion 28a' and four inlet / outlet holes 34 'like the manifold 28.

The center of the diaphragm 25 'is connected to the right end of the shaft 26. At this time, the diaphragm 25, the diaphragm 25 ', and the shaft 26 are integrally reciprocated in a predetermined stroke in the left-right direction by a high-pressure air drive mechanism (not shown) provided in the body 22. At this time, as shown in FIG. 1, when one diaphragm 25 is in the suction process, the other diaphragm 25 'is in the discharge process, which is alternately repeated in the opposite relationship.

Next, the operation of the above configuration will be described. In the diaphragm pump 21 described above, looking at the first pump section 23, first, as shown in FIG. 1, in the suction step in which the diaphragm 25 is displaced to the right, the inside of the pump chamber 27 is A negative pressure is applied to the liquid passage 29 communicating with the negative pressure, and the discharge valve 31 is closed and the suction valve 30 is opened. As a result, the paint is sucked into the liquid passage 29 through the suction pipe 32 (suction port 32a) and then sucked into the pump chamber 27 through the inlet / outlet hole 34.

On the other hand, in the discharge process in which the diaphragm 25 is displaced leftward from that state, the pump chamber 27
The paint inside is extruded into the liquid passage 29 through the inlet / outlet hole 34, and the liquid passage 29 has a positive pressure, so that the suction valve 30 is closed and the discharge valve 31 is opened. As a result, the paint is discharged from the discharge port 32a through the discharge pipe 33. In this case, since the operation (step) opposite to the above is performed in the second pump section 23 ', the paint suction step and the paint discharge step are reversed in the first and second pump sections 23, 23'. The coatings are transferred continuously, in an alternating relationship.

In the suction process, however, the paint passes through the inlet / outlet holes 34, 34 'and the pump chambers 27, 27'.
It is sucked into (the recessed portions 24a, 24a 'of the flange portions 24, 24'). At this time, the four inlet / outlet holes 3
4, 34 'are directed in the outer circumferential direction and are tilted in the circumferential direction, so that the paint is, in this case, in the pump chamber 27 of the first pump portion 23, as shown by the arrow in FIG. It is sucked in while generating a rotating flow that winds a counterclockwise vortex.

In the discharging step, the paint in the pump chamber 27 is discharged from the inlet / outlet hole 34 so as to generate a rotational flow in the direction opposite to the arrow in FIG. Therefore, the flow of the paint in the pump chamber 27 is improved and the paint is less likely to stay. In the pump chamber 27 'of the second pump portion 23', a rotational flow is similarly generated, which makes it difficult for the paint to stay.

The type (color) of the paint used for painting
At the time of switching, for example, a cleaning liquid such as thinner is used to clean the inside of the diaphragm pump 21 (the pump chambers 27, 2).
7 ', the liquid passages 29, 29', the suction pipe 32, the discharge pipe 33, etc.) must be washed and then replaced with new paint. In this case, the cleaning is performed by driving the diaphragm pump 21 while supplying the cleaning liquid to the suction port 32a side.

Even during this cleaning, in the suction step, the cleaning liquid sucked from the inlet / outlet holes 34, 34 'is sucked so as to generate a rotational flow in the pump chambers 27, 27'. In the discharging process, the cleaning liquid in the pump chambers 27 and 27 'is also discharged from the inlet / outlet holes 34 and 34' so as to generate a rotating flow. Therefore, the flow of the cleaning liquid in the pump chambers 27, 27 'becomes good, and the coating liquid is less likely to stay in the pump chambers 27, 27'. It can be done efficiently.

As described above, according to this embodiment, since the inlet / outlet holes 34, 34 'are provided so that the rotational flow is generated in the pump chambers 27, 27' when the liquid is sucked and discharged, the conventional pumps are used. Unlike the one in which the washability was poor due to the poor liquid flow in the chambers 6 and 6 ', it is possible to suppress the retention of the paint in the pump chambers 27 and 27', and consequently to prevent gelation and solidification. The flow of the cleaning liquid can be improved, and as a result, the cleaning properties of the pump chambers 27, 27 'can be improved, and the cleaning can be performed in a short time with a small amount of the cleaning liquid. The effect can be obtained.

(2) Second and Third Embodiments and Other Embodiments Next, a second embodiment of the present invention (corresponding to claim 3) will be described with reference to FIGS. 4 and 5. In the diaphragm pumps of the second and third embodiments described below, the diaphragm pump 21 of the first embodiment will be described.
Although the type is slightly different from the above, since the basic configuration of the pump is almost common, detailed description of such common parts will be omitted, and the main features will be described below. Will be described.

FIG. 4 schematically shows a disassembled state of the diaphragm pump 41 according to the second embodiment of the present invention.
The diaphragm pump 41 is provided on the left and right sides of the body 42.
The circular diaphragms 43 and 43 'and the substantially square flange portions 44 and 44' are symmetrically formed. The left and right diaphragms 43, 43 'are connected by a shaft 45 penetrating the body 42, and
2 is provided with a drive mechanism (not shown) for driving the diaphragms 43, 43 '. Although only the left flange portion 44 is shown, the flange portion 4
A circular recess 44a is formed on the inner surface side of each of 44 and 44 'to form a pump chamber 46 together with the diaphragm 43.

Then, as shown in FIG. 5, an inlet hole 47 for the fluid (paint) is formed in the recess 44a of the flange portion 44.
And the outlet hole 48 is open, and the flange portion 44
An inflow passage 49 continuous with the inlet hole 47 in the wall of the
A discharge passage 50 is formed so as to be continuous with the outlet hole 48. In the outer wall portion of the flange portion 44, there is formed a suction port 49a which is located in the lower portion of the left wall portion in FIG. 5 and which is connected to the inflow passage 49 and is connected to the paint supply source. And a discharge port 50a connected to the spray gun and connected to the discharge passage 50.

As shown in FIG. 4, the suction port 49a of the flange portion 44 and the suction port 49a 'of the flange portion 44' are connected by the manifold 56, and the flange portion 44 is also connected. The discharge port 50a of the above and the discharge port 50a 'of the flange portion 44' are connected by a manifold 57. Although not shown, check valves are incorporated in the suction port 49a and the discharge port 50a.

At this time, the inlet hole 47 is formed in the recess 44a.
It is formed so as to extend in the direction along the circumferential direction, that is, in the left-right direction in FIG. The inflow passage 49 is formed to extend to the left in FIG. 5 and is connected to the suction port 49a. The outlet hole 48 is formed at a position shifted (offset) from the center of the recess 44a (pump chamber 46) to the outer peripheral side in the rightward portion in FIG. The discharge passage 50 extends upward from the discharge passage 50 and is connected to the discharge port 50a.

As a result, the liquid (paint or cleaning liquid) is sucked and discharged in the pump chamber 46 in the same direction with respect to the rotation direction. Incidentally, the inlet hole 47
The (inflow passage 49) is formed to have a larger size (larger cross-sectional area) than the outlet hole 48 (discharge passage 50). Although not shown in detail, the same inlet hole, outlet hole, inflow passage, and discharge passage are formed symmetrically with the flange portion 44 in the right flange portion 44 'as well (see the suction port in FIG. 4). Only 49a 'and discharge port 50a' are shown).

In the above construction, during the suction process in which the diaphragm 43 is displaced to the right, the paint (cleaning liquid during cleaning) is sucked into the pump chamber 46 through the inlet hole 47. At this time, Inlet hole 47 (inflow passage 4
Since 9) extends in a so-called tangential direction, the paint (cleaning liquid) is sucked while generating a counterclockwise rotating flow in the pump chamber 46, as shown by the arrow in FIG. On the other hand, even in the discharging step, the paint (cleaning liquid) in the pump chamber 46 extends in the tangential direction, so to speak, in the outlet hole 48 (discharge passage 50). Outlet hole 4 while generating a counterclockwise rotating flow in 46
8 will be discharged.

Therefore, according to this embodiment, similarly to the first embodiment, the inlet hole 47 and the outlet hole 48 are provided so that a rotational flow is generated in the pump chamber 46 when sucking and discharging the liquid. Therefore, it is possible to prevent the paint from staying in the pump chamber 46, and further to prevent gelation and solidification, and to improve the flow of the cleaning liquid. As a result, the cleaning performance of the pump chamber 46 can be improved. Therefore, it becomes possible to perform cleaning in a short time with a small amount of cleaning liquid.

FIGS. 6 and 7 show a third embodiment (corresponding to claim 4) of the present invention. The difference between the third embodiment and the second embodiment is as follows. It is in. That is, FIGS. 6 and 7 show the flange portion 51 of this embodiment.
The inner surface side of the flange portion 51 has a circular recess 51a that forms a pump chamber with a diaphragm (not shown). And this flange portion 51
The inlet hole 52 and the outlet hole 5 opening in the recess 51a.
3, an inflow passage 54 having a suction port 54a and a discharge passage 55 having a discharge port 55a are formed.

At this time, the inlet hole 52 is formed in the recess 51a.
It is formed on the lower left side in FIG. 6, which is a position deviated from the central portion in the (pump chamber) to the outer peripheral side, so as to extend in a direction substantially along the circumferential direction, that is, in the vertical direction in the figure, and the inflow passage 54 is formed extending downward from there. The outlet hole 53 is formed in the recess 51a (pump chamber) on the upper right side in FIG. 6 so as to extend in the vertical direction, and the discharge passage 55 is formed so as to extend upward therefrom. There is.

Thus, in the suction process, the inlet hole 5
The paint (or cleaning liquid) sucked from 2 is sucked in the pump chamber 46 while generating a clockwise rotating flow, as indicated by an arrow A in FIG. On the other hand, in the discharge step, the paint (cleaning liquid) in the pump chamber is discharged from the outlet hole 53 while generating a counterclockwise rotating flow in the pump chamber as shown by an arrow B in FIG. . That is,
Liquid is sucked and discharged in the pump chamber in the opposite direction with respect to the rotation direction.

Also in this embodiment, as in the second embodiment, the inlet hole 52 and the outlet hole 53 are provided so that a rotational flow is generated in the pump chamber at the time of sucking and discharging the liquid.
It is possible to prevent the paint from staying in the pump chamber, and further to prevent gelation and solidification, and to improve the flow of the cleaning liquid. As a result, it is possible to improve the cleaning performance of the pump chamber and The cleaning liquid enables cleaning in a short time.

By the way, the inventor of the present invention conducted a test concerning the cleaning property on the above-mentioned first, second and third embodiments and the conventional example. Although detailed description of the test is omitted, as a result of the test, in any of the configurations of the first, second, and third examples, remarkably good cleaning property was obtained as compared with the conventional example. . In this case, in particular, in the second embodiment in which the liquid is sucked and discharged in the same direction with respect to the rotation direction, superior results are obtained as compared with the third embodiment in which the liquid is sucked and discharged in the opposite direction. . In addition, the same degree of cleanability was obtained in the first and second examples.

The surface of the concave portion of the flange portion in each of the above embodiments may be coated with a fluororesin such as Teflon (corresponding to claim 5). According to this, the liquid such as paint is unlikely to adhere to the surface of the recess, which can contribute to further improvement of the cleaning performance of the pump chamber. In this case, although the material of the diaphragm is not limited in the present invention, it goes without saying that the diaphragm may be made of fluororesin.

Further, in each of the above-mentioned embodiments, the concave portion provided in the flange portion is formed into a circular shape, but it may be formed into an elliptical shape, and similarly, a rotary flow can be generated in the pump chamber, which facilitates cleaning. Can be improved. However, in this case, a circular or elliptical shape is not necessarily a strict circular shape,
It does not mean only an ellipse, but may be a slightly distorted circle or an ellipse, has a straight part in a part of the peripheral edge, or may be a polygon close to a circle such as an octagon. The point is that the liquid may have a shape that creates a rotating flow in the pump chamber.

In addition, the number of entrance / exit holes in the first embodiment is not limited to four, and may be two, three, or five or more. Further, the structure of the diaphragm pump is not limited to the one having two pump chambers (pump section), but may be one pump chamber, and is a system of driving the diaphragm by hydraulic pressure or the like. May be.
Furthermore, the present invention is not limited to the one that transfers the paint, but it can be applied to all diaphragm pumps that transfer (pressure-feed) various liquids. It is possible.

[0049]

As is apparent from the above description, according to the diaphragm pump of the present invention, the pump chamber is formed between the circular or elliptical recess provided on the flange and the diaphragm. Since the inlet and outlet holes for the liquid that open in the concave portion of the flange are opened at positions displaced from the central portion of the pump chamber toward the outer peripheral side in a form that has an inclination with respect to the radial direction, In this case, the flow of the liquid is improved, and it is possible to improve the cleaning performance of the pump chamber, which is an excellent effect.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is a vertical cross-sectional front view showing the overall configuration of a diaphragm pump.

FIG. 2 is a vertical front view (a) of the manifold and a right side view (b) of the convex portion.

FIG. 3 is a right side view of the flange portion.

FIG. 4 shows a second embodiment of the present invention and is an exploded perspective view of a diaphragm pump.

FIG. 5 is a right side view of the flange portion.

FIG. 6 shows a third embodiment of the present invention and is a right side view of the flange portion.

7 is a vertical cross-sectional view taken along the line aa of FIG.

FIG. 8 is a vertical sectional front view of a diaphragm pump showing a conventional example and showing different steps in (a) and (b).

[Explanation of symbols]

In the drawing, 21 and 41 are diaphragm pumps and 22 and 42.
Is a body, 23, 23 'is a pump part, 24, 24', 4
4, 44 ', 51 are flanges, 24a, 24a', 4
4a and 51a are concave portions, 25, 25 ', 43 and 43' are diaphragms, 27, 27 'and 46 are pump chambers, 28 and 2
8'is a manifold, 29, 29 'is a liquid passage, 34,
34 'is an inlet / outlet hole, 47, 52 are inlet holes, 48, 53 are outlet holes, 49, 54 are inflow passages, and 50, 55 are discharge passages.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3H075 AA08 BB04 BB14 BB16 BB21                       CC03 CC37 CC40 DA01 DA05                       DA08 DA09 DB10 DB42                 3H077 AA05 BB03 CC02 CC07 CC17                       DD14 EE04 EE40 FF02 FF06                       FF12 FF14 FF22 FF45

Claims (5)

[Claims] 1. A flange portion having a circular or circular-like shaped concave portion on the inner surface side and having a liquid inlet hole and a liquid outlet opening in the concave portion, and the concave portion mounted on the inner surface side of the flange portion. And a diaphragm that forms a pump chamber between the pump chamber and the diaphragm, and the suction and discharge of the liquid into and from the pump chamber by displacement of the diaphragm, the inlet and outlet holes for the liquid provided in the flange portion. At a position displaced from the center of the pump chamber to the outer peripheral side,
A diaphragm pump, which is opened in a form having an inclination with respect to a radial direction. 2. A plurality of holes, which also serve as the inlet hole and the outlet hole, extend in the flange portion from a center portion on the outer surface side of the flange portion in a direction inclined with respect to the axial direction and in the radial direction. The diaphragm pump according to claim 1, wherein the diaphragm pump is provided so as to be inclined with respect to and open in the recess. 3. The inlet hole and the outlet hole in the flange portion extend in a direction substantially along the circumferential direction, respectively, and liquid suction and discharge in the pump chamber are performed in the same direction with respect to the rotation direction. The diaphragm pump according to claim 1, wherein the diaphragm pump is provided in the diaphragm. 4. The flange has the inlet hole and the outlet hole extending substantially along the circumferential direction, respectively, and suction and discharge of liquid in the pump chamber are performed in opposite directions with respect to the rotational direction. The diaphragm pump according to claim 1, wherein the diaphragm pump is provided in the diaphragm. 5. The surface of the concave portion of the flange portion is coated with a fluororesin.
The diaphragm pump according to any one of 1 to 4.