JP2003269337A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm pump with a diaphragm main body integrally formed for downsizing with a diaphragm part forming a pump chamber, and a suction valve having a thin valve part on a plate-like part connecting diaphragm parts of the diaphragm main body together, whereby noise occurring when the suction valve opens and closes is restrained. <P>SOLUTION: The thin valve part and the suction valve having an opening on the valve part and the periphery thereof is provided on the plate-like part which connects the diaphragm parts of the diaphragm main body together. Occurrence of noise upon opening/closing of the valve is reduced by providing a recess on the surface of the suction opening closing side of the valve part of the suction valve. <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, and more particularly to a diaphragm pump having an improved suction valve.

[0002]

2. Description of the Related Art A conventional diaphragm pump has a structure as shown in FIG. In this figure, 21 is a motor,
Reference numeral 22 is an output shaft of the motor 21, 23 is a crank base fixed to the output shaft 22, 24 is a drive shaft tilted and fixed to the crank base 23, and 26 is rotatably attached to the drive shaft 24. Driving body, 27 is a casing, 2
Reference numeral 8 is a cylinder portion, and 29 is a valve housing. Three
Reference numeral 1 is a diaphragm portion, 32 is a cylindrical discharge valve, and the diaphragm portion 31 and the discharge valve 32 are integrally configured to form a diaphragm body 30. The diaphragm body 30 is held by the cylinder portion 28 and the valve housing 29. Further, 33 and 34 are a valve chamber portion (common chamber) integrally formed with the valve housing 29 and a discharge port, 35 is a suction valve, and 36 is a suction port.

A diaphragm pump having such a structure is
The crank base 23 is rotated by the rotation of the output shaft 22 due to the driving of the motor 21. Due to the rotation of the crank base 23, the inclination direction of the drive shaft 24 fixed to it changes. As a result, the driving body 26 also changes, and the driving portion (piston portion) 31 of the diaphragm portion 31 attached thereto
a reciprocates and pumps. That is, when the drive portion 31a rises like the diaphragm portion on the right side of the drawing, the volume of the pump chamber decreases and the pressure increases, and the cylindrical discharge valve 32
And the fluid is discharged from the discharge port 34. On the other hand, when the drive unit descends like the diaphragm on the left side, the volume of the pump chamber increases, the intake valve 35 is opened, and the external fluid flows in through the intake port 36.

As described above, due to the change in the volume of the pump chamber, the fluid flows from the outside through the suction valve into the pump chamber, and the next inflow fluid opens the discharge valve and is supplied from the discharge port. Do.

[0005]

The conventional diaphragm pump described above is a tubular valve in which the discharge valve is formed integrally with the diaphragm portion, and for this reason, the valve chamber portion in which this tubular valve is arranged. The portion forming the (common chamber) is also cylindrical and has a shape projecting from the surface portion of the lid, and has a discharge port extending from the upper end surface of this valve chamber part, and is supplied to this discharge port. It is used by connecting a pipe or the like to guide it to the proper place.

Therefore, in the conventional diaphragm pump, at least the tubular portion forming the valve chamber portion (common chamber) projects to the outside from the valve housing, so that the diaphragm pump must be relatively large. Moreover, its shape is stepped. This rarely limits the location of pumps.

Further, since the discharge valve has a cylindrical shape, there is a drawback that the cylindrical discharge valve is deformed during parts storage, transfer, etc. after the valve is formed and before the pump is assembled. Further, since the tubular valve is thin, there is a problem in assembly such that the work of inserting the tubular valve into the valve chamber (common chamber) when assembling the pump is troublesome.

Further, in the conventional diaphragm pump, the suction valve is provided in each pump chamber portion (the portion where each diaphragm portion exists), and the installation location is limited.
It is a structure that is difficult to reduce in size and cost.

In order to solve the above problems, the present applicant has developed a small diaphragm pump,
Filed as No. 19900.

In this diaphragm pump, the discharge valve is formed in a flat plate shape to reduce the size of the pump. Also,
The suction valve is integrated with the diaphragm body to further reduce the size and simplify the assembly work.

Further, the suction valve has a thin valve portion formed on a flat plate-shaped portion of the diaphragm body for integrally connecting the diaphragm portions, and has a relatively simple structure.
Further, it is formed integrally with the diaphragm body, and has features such as easy assembly.

However, this intake valve has a drawback that noise is generated when the valve is opened and closed, as will be described later.

The present invention provides a diaphragm pump which is easy to assemble and is easy to manufacture and can be further downsized, and in particular, a diaphragm pump having a feature in the suction valve.

[0014]

DISCLOSURE OF THE INVENTION A diaphragm pump according to the present invention comprises a diaphragm main body in which a plurality of diaphragm portions forming a pump chamber are integrally connected by a flat plate portion, and each diaphragm is attached to the flat plate portion of the diaphragm main body. And a thin valve portion in which the suction valve is integrally connected to the main body of the diaphragm portion, and a suction valve formed corresponding to each portion, and one discharge valve arranged substantially in the center of the plurality of diaphragm portions. The lower surface of the valve portion has a curved concave portion formed of peripheral openings, and the pumping action is performed by reciprocating the driving portion of each diaphragm portion with a constant phase difference.

In the diaphragm pump of the present invention, the surface of the suction valve on the valve opening / closing side is formed into a curved concave portion, so that the noise generated when the valve is opened / closed is greatly reduced.

That is, the diaphragm pump of the present invention is based on the diaphragm pump of the invention of the above-mentioned patent application,
The structure of the intake valve is improved, and the surface of the intake valve on the side that closes the intake port is not a flat surface but a surface having a recessed portion to prevent noise generation.

[0017]

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. FIG. 1 shows the configuration of a pump according to a first embodiment of the present invention. In the figure, 1 is a motor, 2 is an output shaft of the motor 1, 3 is a crank base fixed to the output shaft 2, 4 Is a drive shaft fixed to the crank base 3 with an inclination with respect to the output shaft 2, and 6 is a driving body, which is rotatably attached to the drive shaft 4 by inserting the drive shaft 4 into its bearing portion 6a. ing. 7 is a case having a vent hole 7a, 8 is a cylinder part, 9 is a valve housing, 10 is a gas collector, 11 is a cylinder part 8
A diaphragm body having a diaphragm portion 11a held by the valve housing 9 and 12, a pump chamber 12, 13 a discharge valve attached to the valve housing 9, and 14 a discharge port. The case 7, the cylinder portion 8, the valve housing 9, and the gas collection body 10 are connected to the diaphragm body 1 by the cylinder portion 8 and the valve housing 9.
1, the discharge valve 13 is attached to the valve housing 9, and the discharge valve 13 is assembled as shown in FIG.

In the pump of the first embodiment,
The diaphragm main body 11 is as shown in FIG. 2, of which (A) is a plan view and (B) is a side view (cross-sectional view). 3 is a view showing the shape of the cylinder portion 8,
(A) is a plan view and (B) is a sectional view. 4 is a plan view (bottom view) of the valve housing 9, FIG. 5 is a gas collection view (A) is a bottom view, (B) is a sectional view, and FIG. 6 is a discharge valve 13.
Of these, (A) is used in the pump of the first embodiment shown in FIG. See also FIG.
FIG. 4 is a diagram showing a suction valve of the diaphragm pump of the present invention. Of these, (A) is the suction valve used in the diaphragm pump of the first embodiment shown in FIG.

The diaphragm pump of the present invention is constructed by assembling the diaphragm portion and the like as described above as shown in FIG.

Next, the respective parts constituting the diaphragm pump of the first embodiment and the entire structure in the assembled state will be described in detail.

First, the diaphragm body 11 has a structure as shown in FIG. 2, and a plurality of diaphragm portions 11a (three of them are arranged at equal intervals on the circumference as shown in the plan view of FIG. Is provided) and three thin planar suction valves 11c are formed between these diaphragm portions 11a. The intake valve used in the first embodiment has a shape shown in FIG. That is, as shown in FIGS. 1 and 7 (A), a thin valve portion 11d extending from the flat plate-shaped portion of the diaphragm body 11 is provided in the circular opening 11e. The lower surface of the valve portion 11d has a gentle curved concave portion 11f, and the circular portion around the curved surface is in close contact with the surface of the cylinder 8 on the diaphragm body 11 side. When the peripheral portion of the thin valve portion 11d is in close contact with the surface of the cylinder 8, the valve is closed, and the valve is opened by being separated from the surface of the cylinder 8. The diaphragm body 11 is held by the cylinder portion 8 and the valve housing 9 as shown in FIG.

As shown in FIG. 3, the cylinder portion 8 has a hole (suction port) 8b formed between the cylinder 8a and the cylinder 8a in which each diaphragm portion is arranged.

The valve housing 9 has a shape as shown in FIG. This figure is a bottom view of FIG. 1, in which 9a is a vent hole, 9b is a groove, and 9c is a valve mounting hole.

The discharge valve used in the diaphragm pump of the first embodiment has the shape shown in FIG. 6 (A). That is, as shown in this figure, the ribs 13c extend in three directions from the center, and the portion 13a between the ribs 13c constitutes a valve. 13b is a convex portion (fixed portion)
Is.

In FIG. 6, the left side is a plan view and the right side is a sectional view.

The cylinder body 8, the diaphragm body 11 and the valve housing 8 as described above are held by sandwiching the diaphragm body 11 between the cylinder portion 8 and the valve housing 9 as shown in FIG.

After holding the diaphragm portion 11 in this manner, the discharge valve 13 is attached to the valve mounting hole 9c of the valve housing 9.
The convex portion 13b is attached to the valve housing 9 by press fitting or the like, and further, the gas collector 10 having the discharge port 14 is attached to the valve housing 9.

Thus, the first embodiment of the present invention shown in FIG.
The pump of the embodiment is assembled.

Next, the operation of the pump according to the first embodiment of the present invention will be described.

This pump has a crank base 3 for rotating and fixing the output shaft 2 by driving the motor 1.
To rotate. As a result, the drive shaft 4 changes its inclination direction, and changes the inclination direction of the drive body 6, so that the drive portion 11 of the diaphragm portion 11a can be changed as in the conventional pump of FIG.
Move b up and down.

The volume of the pump chamber 12 changes due to the vertical movement of the drive unit 11b. When the drive portion 11b of the diaphragm portion 11a rises from that in FIG. 1, the volume of the pump chamber 12 decreases and the pressure increases, which opens the discharge valve 13 (valve portion 13a between the ribs 13c in FIG. 6). The gas is supplied to the outside through the discharge port 14 through the gap between the valve housing and the gas collector 10 in FIG. At this time, the discharge valves corresponding to the other diaphragm parts are closed.

Further, the diaphragm portion 11a on the right side of FIG.
When the drive portion 11b of the pump chamber 12 is lowered and the volume of the pump chamber 12 is increased, the pressure in the pump chamber is decreased and the discharge valve 13 is closed.
On the contrary, the flat thin part of the diaphragm body (suction valve) 1
In 1c, the pressure in the space 15 is reduced and the valve portion 11d is opened. As a result, the fluid in the space of the cylinder portion 8 and the case 7 flows in from the suction port 8b of the cylinder portion 8, and the valve housing 9 shown in FIG. It flows into the diaphragm through the groove 9b. At that time, the fluid flows into the case 7 from the outside through the vent hole 7a provided in the case 7. As a result, the space formed by the case 7, the cylinder portion 8 and the like is constantly filled with air.

By repeating such an operation, this pump chamber continues the inflow and outflow of the fluid to perform the pump action.

Further, the pump action is performed in the other diaphragm portion (pump chamber) by the same operation. Moreover,
In the pump shown in FIG. 1, the drive mechanism is configured as described above, and due to the continuous change in the tilt direction of the drive body, the fluid is supplied almost continuously by operating each diaphragm portion with a constant phase difference. Done.

The pump according to the first embodiment has the above-mentioned structure, and the intake valve and the discharge valve are integrally formed with a plurality of valves. Since the flat valve is used, instead of the tubular portion forming the common chamber of the conventional example, the gas collection close to the flat plate is adopted, so that the case 7 to the gas collection 10 are equipped with pipes or the like for supplying the fluid. Except for the outlet 14, it has a substantially cylindrical shape, and the height of the pump can be reduced, and hence the pump can be downsized. Further, the discharge valve 13 can be easily attached by press-fitting or retracting the convex portion 13b into the hole 9c of the valve housing, and can be easily assembled by sequentially combining and fixing the cylinder portion, the diaphragm body, and other parts. Etc., the assembly of the pump is easy. Further, the suction valve is formed integrally with the diaphragm body and has a simple shape. Further, the thin valve portion of the intake valve has a shape having a concave portion on the surface on the cylinder portion side, so that noise is extremely small when the valve is opened and closed.

In the invention of the above-mentioned patent application which is the basis of the present invention, most of the various suction valves used in this diaphragm pump are flat, not having recesses. In other words, the surface of the thin valve portion of the suction valve that is in contact with the cylinder portion (the surface that closes the suction port) is a flat surface. Therefore, when the valve is opened and closed, the flat surface of the valve portion repeatedly comes into contact with and separates from the surface of the cylinder portion, which causes noise.

On the other hand, the suction valve used in the diaphragm pump of the first embodiment of the present invention is shown in FIG.
As shown in FIG. 7, the thin valve portion has a shape in which a recessed portion 11f is formed on at least the surface of the valve portion that is in contact with the cylinder portion. Thus, the suction valve is configured such that only the peripheral portion of the thin-walled valve portion that surrounds the recess is in contact with the surface of the cylinder portion that surrounds the suction port. This allows
The intake valve completely closes the intake port formed in the cylinder portion when the valve is closed, so that the valve can be reliably opened and closed. At the same time, this suction valve comes into contact with the surface of the cylinder portion only at a part of the periphery of the concave portion, and it is possible to suppress the generation of noise.

The discharge valve of the diaphragm pump of the present invention is shown in FIG. 6 (B) in addition to FIG. 6 (A).
(C), (D), etc. are considered.

Among these discharge valves, the discharge valve shown in FIG. 6B has a fixing recess 13d without the fixing portion 13b as shown in FIG. And
When this discharge valve 13 is attached to the pump, a convex portion is formed in the center of the valve housing as in the second embodiment described below, and the concave portion of the discharge valve of FIG. 6B is fitted into this convex portion. Combine and position the valve.

Further, the discharge valve shown in FIG. 6C has a shape in which a mounting projection 13e is provided in the center of the lower surface of the discharge valve. When using this valve, provide a concave portion that fits the convex portion of the valve in the central portion of the valve housing, fit the convex portion of the valve into this concave portion, and fix it by pressing the rib with air collection. Good.

Further, the discharge valve shown in FIG.
The structure is the same as that of (C), and the valve portion 13a has a minimum area necessary for closing the vent hole to have the function of the valve so that the valve can be easily opened and closed. .
That is, the valve can be opened and closed even if the pressure in the pump chamber is slightly increased or decreased, and the valve can be used, for example, in a smaller diaphragm pump.

In the valve having the structure of FIG. 6A, the shape of the valve portion can be made to be similar to 13a of FIG. 6D so that it can be used in a smaller pump.

Next, the suction valve used in the diaphragm pump of the present invention may have various shapes other than the one used in the first embodiment. That is, what is shown in FIG. 7 can be considered. Of these, (A) is used in the pump of the embodiment shown in FIG. 1, and (B) and (C) show suction valves of different shapes. In these figures, the left side is a plan view and the right side is a sectional view.

Of these valves, FIGS. 7B and 7C have the following configurations.

In the suction valve of FIG. 7B, a circular opening 11i and a circular portion 11m (valve portion) having a diameter smaller than that of the opening 11i closing the suction port are formed in the flat plate-shaped portion of the diaphragm body 11.
And a holding portion 11h extending in the up-down direction in the drawing, and a thin-walled portion. 11j is the opening 1
It is an arc-shaped opening formed between 1i and the thin portion 11 forming the valve. This suction valve also has a shape in which the surface of the valve portion on the side in contact with the surface of the cylinder portion has a curved concave portion 11f.

Further, (C) is a shape in which a circular thin portion 11m which constitutes a valve is held by three holding portions 11n, and the thin portion 11m closes the vent hole formed in the cylinder portion. With this configuration, a gap (opening) is formed around this thin portion. In the suction valve of FIG. 7C, the entire valve portion has a concave shape on the cylinder portion side and is curved as a whole. Therefore, at least the cylinder portion side has a concave portion 11f, and the periphery of the concave portion is configured to contact the surface of the cylinder portion.

Next, a second embodiment of the diaphragm pump of the present invention will be described.

The second embodiment of the present invention is an example shown in FIG. 8 in which the discharge valve having the structure shown in FIG. 6B is used. This discharge valve has a shape in which a recess (valve mounting recess) 13d is provided in the center of the valve. On the other hand, as shown in FIG. 8, in the center of the valve housing 9, a valve mounting projection 9d that fits into the recess 13d of the discharge valve is provided at the discharge port (gas collection side), and the recess 13d of the discharge valve is provided in the valve The valve is arranged so as to be fitted into the convex portion 9d of the housing, and the discharge valve is fixed by suppressing the rib 13c portion with the gas collector 10. The other structure is substantially the same as that of the first embodiment.

FIG. 9 is a diagram showing a third embodiment of the present invention.

In the diaphragm pump of the third embodiment, the structure of the discharge valve 13 is different from that of the first and second embodiments, but other structures are the same as those of the first and second embodiments. Is the same as.

That is, in the diaphragm pump of the third embodiment, the discharge valve 13 is provided with a fixing portion 13f for pressing and fixing the valve at the central portion as shown in FIG. 6 (E). Three ribs 13c are radially formed from the portion 13f, and a thin portion of the ribs 13c between adjacent ribs constitutes a valve 13a corresponding to each pump chamber 12.

The discharge valve 13 shown in FIG. 6 (E) has a third structure for fixing and holding the discharge valve 13 at a predetermined position by inserting the valve pressing portion into the recess forming the fixing portion 13f. In the embodiment, as shown in FIG. 9A, the valve pressing portion 10b is formed at the center of the gas collection 10. As shown in the enlarged view of FIG. 9 (B), this valve pressing portion 10b is supported by ribs 10c for holding, and ventilation holes 10d are provided between the ribs 10c.

As described above, in the pump of the third embodiment, the valve holding portion 10b is formed in the gas collector 10, so that the discharge valve 13 can be securely held and fixed at a predetermined position, and between the ribs 10c. By forming the ventilation hole 10d, the fluid flowing from each pump chamber by opening the discharge valve 13 at the time of pump action is supplied from the discharge port 14 to the outside without any trouble.

The following fourth, fifth and sixth embodiments are diaphragm pumps which are basically different from the above-mentioned first, second and third embodiments in the structure of the discharge valve and the like. The suction valve shown in FIG. 7A is applied.

10 and 11 show the structure of a pump according to the fourth embodiment of the present invention. FIG. 10 is a sectional view and FIG.
1 is a cross-sectional view in a direction perpendicular to the paper surface of FIG. In these drawings, 1 is a motor, 2 is an output shaft of the motor 1, 3 is a crank base fixed to the output shaft 2, 4 is a crank base 3
A drive shaft, which is fixed to the output shaft 2 in an inclined manner, 6
Is a driving body, and is rotatably attached to the driving shaft 4 by inserting the driving shaft 4 into the bearing portion 6a. 7
Is a case having a vent hole 7a, 8 is a cylinder part, 9 is a valve housing, 10 is a gas collector, 11 is a diaphragm main body having a diaphragm part 11a held by the cylinder part 8 and the valve housing 9, and 12 is a pump. Reference numeral 13 denotes a chamber, 13 is a discharge valve having a V-shaped cross section, which is placed in a recess 9a having a V-shaped cross section, and 14 is a discharge port formed in the gas collector 10. And case 7,
The cylinder portion 8, the valve housing 9, and the gas collector 10 sandwich the diaphragm body 11 between the cylinder portion 8 and the valve housing 9, and the discharge valve 13 has a V-shaped cross section.
Is placed in a recess 9a having a V-shaped cross section of the valve housing 9, and the mounting portion (protrusion) 13b of the discharge valve 13 is fixed by being press-fitted into the mounting hole 9c of the valve housing 9, and then the gas collector 10 is mounted. assemble.

When the valve 13 having the V-shaped cross section of the valve housing 9 is attached, the central portion 13c of the valve 13 is pushed from above to attach the attaching portion (protrusion) 13b to the attaching hole 9.
It may be pressed into c, but in reality, it is a mounting part (projection)
According to the method in which a string-shaped member is provided in the lower portion of 13b, the string-shaped member is pressed down by pulling the string-shaped member downward, and then the string-shaped member is removed, the work is easy and effective. As described above, after the discharge valve 13 is press-fitted and fixed to the valve housing 9 by the above-described method, the diaphragm main body 11 is sandwiched between the cylinder portion 8 and the valve housing 9 in which the discharge valve 13 is press-fitted and fixed, and the gas collection 10 is further fixed. Assemble these parts by the method described below.

The diaphragm pump of the fourth embodiment differs from the first to third embodiments in that a valve having a V-shaped cross section is used as the discharge valve. Therefore,
The structure of the discharge valve and the point that the concave portion having a V-shaped cross section is formed in the valve housing for arranging the discharge valve.
This is different from the third embodiment. However, other configurations are basically the same. In particular, the point that the valve shown in FIG. 7A is used as the suction valve is the same as in the above-mentioned embodiment.

The diaphragm pump according to the fourth embodiment has a structure in which two diaphragm portions are arranged on the circumference 180 ° apart, as shown in FIGS. The intake valves are arranged 180 ° apart from each other in the middle part between the diaphragm parts. That is, as shown in FIG. 10, the two diaphragm portions 11a (pump chambers 12) are arranged symmetrically to the left and right with respect to the extension line of the output shaft 2 of the motor 1. Further, the intake valve has a configuration in which two intake valves (valves described in FIG. 7A, respectively) are arranged on the left and right, as shown in FIG. 11, which is a cross-sectional view taken in the direction perpendicular to the plane of FIG. is there.

FIG. 12 is a diagram showing a fifth embodiment of the diaphragm pump of the present invention.

The pump of the fifth embodiment has a section V
The letter-shaped discharge valve 13 does not have a mounting portion, and the valve holding portion 10a is provided below the discharge port 14 of the gas collection (lid) 10.
Is provided, which is different from the fourth embodiment.

The pump of the fifth embodiment differs from the pump of the fourth embodiment in that the discharge valve is attached to the valve housing, and has a simpler construction.

That is, in FIG. 12, 1 is a motor, 2 is an output shaft of the motor 1, 3 is a crank base, 4 is a crank base 3
Drive shaft attached to the drive shaft, 6 a drive member slidably attached to the drive shaft 4, 7 a case, 8 a cylinder part,
Reference numeral 9 is a valve housing, 10 is a gas collector (lid), 11 is a diaphragm body having a diaphragm portion 11a, and 12
Is a pump chamber, 13 is a mortar-shaped (V-shaped cross section) discharge valve,
These are substantially the same as the pump of the first embodiment shown in FIG. 1 except for the structure of the holding portion 10a of the gas collector 10 and the fixed portion 13c of the discharge valve 13. In addition, 10b is gas collection 10
This is a ventilation hole provided in the holding portion 10a.

The pump according to the fifth embodiment has a simple shape in which the discharge valve 13 does not have a mounting portion (projection) 13b, but has only a central fixing portion 13c, and the gas collector 10 has a simple shape. The difference is that it has a holding portion 10a that presses the fixing portion 13c of the discharge valve 13 to hold and fix the discharge valve.

The structure of the suction valve is substantially the same as that of the pump of the fourth embodiment.

That is, the diaphragm pump of the fifth embodiment holds the diaphragm body 11 by sandwiching it between the cylinder portion 8 and the valve housing 9, and discharges it into the V-shaped recess 9a of the valve housing 9 with a V-shaped cross section. The valve 13 is arranged to fix the gas collector 10 to the valve housing 9. At this time, the downwardly extending valve retainer (retaining portion) 10a provided at the center of the gas collector 10 causes the V-shaped discharge valve 1
The fixing portion 13c at the central portion of 3 is pressure-bonded and fixed so that the discharge valve 13 does not move.

The fifth embodiment is the same as the fourth embodiment except for the method of fixing the discharge valve described above. The operation of the fifth embodiment is the same as that of the fourth embodiment.

As described above, the fifth embodiment is different from the fourth embodiment in the method of fixing the discharge valve 13, and therefore the assembly method is also slightly different. In other words, this fifth
A desirable assembling method of the embodiment is to arrange the discharge valve 13 in the recess 9a of the valve housing 9 and then fix and integrate the valve housing 9 and the gas collector 10. At this time, the gas collection 10 ensures that the discharge valve 13 is held at a predetermined position in the recess 9a of the valve housing 9. Here, the diaphragm main body 11 is assembled by sandwiching the cylinder portion 8 and the valve housing 9 with a component in which the gas collector 10 is integrated.

Next, FIG. 13 is a view showing a sixth embodiment of the diaphragm pump of the present invention.

In the pump of the sixth embodiment, the discharge valve 15 has a U-shaped cross section, and therefore the recess 9e of the valve housing 9 also has the same U-shaped cross section. This is different from the fifth embodiment.

In the sixth embodiment, the discharge valve 15 having a U-shaped cross section is arranged in the U-shaped recess 9e of the valve housing 9. After that, the valve housing 9 is provided with a gas collection 10
By attaching the
The discharge valve 15 is crimped and fixed by a.

The fourth, fifth and sixth embodiments of the diaphragm pump of the present invention described above each have a structure having two diaphragm portions (two pump chambers). However, a diaphragm pump having three diaphragm parts (three pump chambers) or more diaphragm parts (pump chambers) as in the first, second and third embodiments is also
The diaphragm portion may be arranged at an appropriate interval on the circumference surrounding the center of the pump. Then, in relation to the arrangement position of the diaphragm portion, the arrangement of the passage, the groove provided in the valve housing, the suction valve formed in the diaphragm body, etc. may be changed.

For example, the diaphragm portion and the suction valve in the diaphragm body may be arranged as shown in FIG. Similarly, the cylinder portion may be arranged as shown in FIG. 3, and the groove and the like formed in the valve housing may be arranged as shown in FIG.

The openings of the intake valves shown in FIGS. 7A, 7B, and 7C are not limited to circular shapes, and may have other shapes. In addition, it is preferable to appropriately select the shape and the like of the thin portion that constitutes the valve in accordance with the number and position of the suction ports of the cylinder portion.

Further, in the pumps of the first, second and third embodiments of the present invention having these three or three or more pump chambers, the assembly of the cylinder portion, the diaphragm body, the valve housing, the gas collector, etc. May be assembling means as described above.

In the first to sixth embodiments, etc., the drive mechanism has a structure in which the bearing portion of the drive body 6 is rotatably attached to the drive shaft 4 fixed to the crank base by inclining. Even if the drive body is fixed to the drive shaft and the crank base is provided with an oblique hole and the drive shaft is rotatably provided therein, a plurality of diaphragms are provided as in the first, second and third embodiments. The drive part of the part can be reciprocated with a constant phase difference, whereby a pumping action can be performed.

Further, the drive mechanism may be a mechanism other than that shown in FIG. 1 or the like, and any mechanism may be used as long as it has the same effect.

The vent hole 7a provided in the case 7 is not limited to the position shown in the figure. That is, the diaphragm pump of the above-described embodiment is of a type used for supplying gas, etc., and the air flowing into the case 7 through the ventilation hole 7a is supplied from the discharge port by the above operation. However, it is not limited to a gas, but it can be used for supplying a fluid other than a gas such as a liquid by setting an opening through which the fluid flows in at an appropriate position.

Although the diaphragm pump having two or three diaphragm parts (pump chambers) has been described as an embodiment, the present invention can be applied to a pump having four or more diaphragm parts (pump chambers). . Similarly, the diaphragm part (pump chamber) can constitute one diaphragm pump of the present invention.

The diaphragm pumps of the first to sixth embodiments described above are characterized by the shape of the suction valve.

Although the diaphragm pumps of these embodiments use the suction valve shown in FIG. 7A, the suction valve shown in FIGS. 7B and 7C may be used.

Each of the intake valves shown in FIGS. 7A, 7B and 7C is characterized in that a spherical concave portion is formed on the surface on the cylinder portion side. Further, by providing the concave portion, only the circular portion around the concave portion is brought into close contact with the surface of the cylinder portion, thereby suppressing generation of noise during valve opening / closing operation.

However, the spherical concave portion is not limited to the spherical surface, and the suction valve is brought into close contact with the surface of the cylinder portion only at the portion surrounding the suction port formed in the cylinder portion. It only needs to completely block the intake port when the valve is closed.

Therefore, the intake valve does not have to have the concave portion formed on the surface on the cylinder portion side, but may have the following structure.

That is, the surface of the intake valve on the cylinder side may be a flat surface and may have a shape slightly protruding along the line surrounding the intake port.

As shown in FIG. 7D, it has an opening 11e around a thin portion (valve portion) 11d, and the surface of the valve portion 11d on the piston portion side is a flat surface. The convex portion 11p projecting to the piston side is formed so as to surround the suction port formed in the diaphragm portion.

[0086]

As described above, the diaphragm pump of the present invention has a smaller number of parts and is easier to assemble than the conventional pump of this type, and the noise generated when the intake valve is opened and closed is reduced. Suppressed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of a diaphragm pump of the present invention.

FIG. 2 is a diagram showing a configuration of a diaphragm main body of the diaphragm pump of the present invention.

FIG. 3 is a diagram showing a configuration of a cylinder portion of the diaphragm pump of the present invention.

FIG. 4 is a bottom view of the valve housing of the diaphragm pump of the present invention.

FIG. 5 is a diagram showing a structure of a gas collection of the diaphragm pump of the present invention.

FIG. 6 is a view showing various examples of discharge valves used in the diaphragm pump of the present invention.

FIG. 7 is a diagram showing various examples of suction valves used in the diaphragm pump of the present invention.

FIG. 8 is a diagram showing the configuration of a second embodiment of the diaphragm pump of the present invention.

FIG. 9 is a diagram showing the configuration of a third embodiment of the diaphragm pump of the present invention.

FIG. 10 is a diagram showing the configuration of a diaphragm pump according to a fourth embodiment of the present invention.

FIG. 11 is a cross-sectional view taken in a direction perpendicular to the plane of FIG.

FIG. 12 is a diagram showing a configuration of a diaphragm pump according to a fifth embodiment of the present invention.

FIG. 13 is a diagram showing the configuration of a sixth embodiment of the diaphragm pump of the present invention.

FIG. 14 is a diagram showing a configuration of a conventional diaphragm pump.

[Explanation of symbols]

1 motor 2 output shaft 3 crank base 4 drive shaft 6 driver 7 cases 8 cylinder part 8a cylinder 8b suction port 9 valve housing 10 gas collection 11 Diaphragm body 11a Diaphragm part 11b drive unit 11c suction valve 12 pump room 13 Discharge valve 14 Discharge port

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04B 45/04 101 F04B 45/04 101

Claims (5)

[Claims] 1. A diaphragm main body in which a plurality of diaphragm portions forming a pump chamber are integrally connected by a flat plate portion, and an intake valve in which each diaphragm portion is formed corresponding to the flat plate portion of the diaphragm main body. , A discharge valve disposed substantially at the center of the plurality of diaphragm portions, and a pumping operation is performed by sequentially moving up and down the drive portions provided in the respective diaphragm portions with a certain phase difference. In the pump, the suction valve has a thin valve portion integrally formed with a flat plate portion of the diaphragm body and at least one opening formed in a peripheral portion thereof, A diaphragm pump whose lower surface has a curved concave portion. 2. A diaphragm main body in which a plurality of diaphragm portions forming a pump chamber are integrally connected by a flat plate-shaped portion, and an intake valve formed by corresponding each diaphragm portion to the flat plate-shaped portion of the diaphragm main body. , A discharge valve arranged substantially at the center of the plurality of diaphragm portions, and a pumping operation is performed by sequentially moving up and down the drive portions provided in the respective diaphragm portions with a certain phase difference. In the pump, the suction valve has a thin valve portion integrally formed with a flat plate-shaped portion of the diaphragm body and at least one opening formed in a peripheral portion thereof, A diaphragm pump whose lower surface has a continuous convex portion which surrounds a suction port in a plane. 3. The suction valve comprises an opening formed in a flat plate-shaped portion of the diaphragm body, and a thin-walled valve portion extending from the flat plate-shaped portion into the opening and integrally formed with the diaphragm main body. The diaphragm pump according to claim 1 or 2, characterized in that. 4. The suction valve comprises an opening formed in a flat plate-shaped portion of the diaphragm body, and a thin valve portion located in the opening and integrally held by the diaphragm body by at least two holding pieces. The diaphragm pump according to claim 1, wherein the diaphragm pump is provided. 5. The diaphragm body further comprises: a cylinder part having a cylinder for accommodating the diaphragm part and an intake port provided at a position corresponding to the intake valve; and a valve housing for holding the discharge valve. A structure that is sandwiched between the cylinder part and the valve housing, and a groove that connects the pump chamber of each diaphragm part and the corresponding opening of the suction valve is formed on the surface of the valve housing on the side of the diaphragm body. The diaphragm pump according to claim 1, 2, 3, or 4, wherein an intake port is provided at a position corresponding to each of the intake valves of the cylinder portion.