JP2003328951A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a shape of a discharge valve arranged in a pump and to reduce occurrence of noise upon opening/closing of the valve when the pump is in operation. <P>SOLUTION: The whole discharge valve arranged in the pump is made into a simple, thin, flat plate-like shape with its surface of the valve housing side made flat. The occurrence of noise upon opening/closing of the valve is suppressed by providing a recessed part on the surface of the valve housing side of the valve part which functions as a valve, and arranging the valve during the assembling of the valve is made easy by providing a positioning means. <P>COPYRIGHT: (C)2004,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.

[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, 2
Reference numeral 2 is an output shaft of the motor 21, 23 is a crank body fixed to the output shaft 22, 24 is a drive shaft fixed to the crank body 23 while being inclined, and 26 is rotatably attached to the drive shaft 24. Driving body, 27 is a casing, 28
Is a cylinder portion, and 29 is a valve housing. 31
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 the 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.

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, the conventional diaphragm pump is inevitably relatively large in size because it projects at least from the tubular portion forming the valve chamber portion (common chamber) to the outside, and the shape of the diaphragm pump is relatively large. There are steps. 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.

In order to eliminate the above-mentioned drawbacks of the diaphragm pump of the prior art, a patent application 2002 filed by the applicant of the present invention is a diaphragm pump which is easy to assemble such as easy to assemble and can be further downsized. There are 19900 pumps. This diaphragm pump has a structure as described below, and in particular, the discharge valve has a flat plate shape and is easily mounted.

It has a structure as shown in FIG. In this figure, 21 is a motor, 22 is an output shaft of the motor 21, 23 is a crank base fixed to the output shaft 22, 2
Reference numeral 4 is a drive shaft fixed to the crank base 23 with an inclination with respect to the output shaft 22, and reference numeral 26 is a drive member, which has a bearing portion 26a.
The drive shaft 24 is rotatably attached to the drive shaft 24 by being inserted into the drive shaft 24. Further, 41 is a case having a vent hole 41a, 42 is a cylinder portion, 43 is a valve housing, 45 is a cylinder portion 42 and the valve housing 4
3, a diaphragm body having a diaphragm portion 46 held by 3, a pump chamber 48, a discharge valve 49 attached to the valve housing 43, and a discharge port 50.
It is a gas collection gas having 1. Then, the case 41, the cylinder portion 42, the valve housing 43, and the gas collection 50 are sandwiched between the cylinder portion 42 and the valve housing 43 with the diaphragm main body 45 interposed therebetween, and the discharge valve 49 is attached to the valve housing 43, and assembled as shown in the drawing. It is a thing.

In the pump shown in FIG. 8, the diaphragm main body 45 is as shown in FIG. 9, of which (A) is a plan view and (B) is a side view (cross-sectional view). See also FIG.
6A and 6B are diagrams showing the shape of the cylinder portion 42, FIG. 7A being a plan view and FIG. Further, FIG. 11 is a plan view of the valve housing 43, FIG. 12 is a gas collection view (A) is a bottom view, and (B) is a sectional view.

In this diaphragm pump, the diaphragm portion and the like as described above are assembled as shown in FIG.

The respective parts constituting the diaphragm pump of the above application and the entire structure in the assembled state will be described.

First, the diaphragm main body 45 has a structure as shown in FIG. 9, and a plurality of diaphragm portions 46 (three of them are arranged at equal intervals on the circumference as shown in the plan view of FIG. Is formed), and three thin flat valve portions 45c are formed between the respective diaphragm portions 46, and a hole 45d is formed in each valve portion 45c. The diaphragm body 45 is held by the cylinder portion 42 and the valve housing 43 as shown in FIG.

Further, the cylinder portion 42 is a cylinder 4 in which each diaphragm portion 46 is arranged as shown in FIG.
A hole 42b is formed between 2a and the cylinder 42a.

The valve housing 43 has a shape as shown in FIG. FIG. 11 is a view seen from the lower side of FIG. 8, in which 43a is a vent hole, 43b is a groove, and 43c is a valve mounting hole.

The cylinder body 42, the diaphragm body 45 and the valve housing 43 as described above are held by sandwiching the diaphragm body 45 between the cylinder body 42 and the valve housing 43 as shown in FIG.

After holding the diaphragm portion 46 in this manner, the discharge valve 49 is attached to the valve mounting hole 4 of the valve housing 43.
The convex portion 43b is attached to the 3c by press fitting or the like, and the air collecting body 50 having the discharge port 51 is further attached to the valve housing 43.

The pump shown in FIG. 8 drives a motor 21 to rotate an output shaft 22 and a crank base 23 fixed to the output shaft 22. As a result, the drive shaft 24
Changes its tilting direction to change the tilting direction of the driving body 26, and the diaphragm part 4 is changed in the same manner as the conventional pump shown in the figure.
The drive unit 47 of 6 is moved up and down.

By the vertical movement of the drive unit 47, the pump chamber 4
The volume of 8 changes. When the drive portion 47 of the diaphragm portion 46 is raised from that in FIG. 8, the volume of the pump chamber 48 is reduced and the pressure is increased, whereby the valve portion 49 of the discharge valve 49 is increased.
a is opened and is passed between the ribs 49c, and is passed through a gap between the air collecting body 50 of FIG. At this time, the discharge valves corresponding to the other diaphragm parts are closed.

When the drive portion 47 of the diaphragm portion 46 on the right side of FIG. 8 descends and the volume of the pump chamber 48 increases, the pressure in the pump chamber decreases and the discharge valve 49 closes. On the contrary, the flat thin portion of the diaphragm body 45 (suction valve) 4
5c is deformed and opened toward the space 44 side, and a gap between the cylinder 5 and the cylinder portion 42 is formed by the hole 42b.
2a, the fluid in the space of the case 41 flows in, and the small holes 4
5d through the groove 43b of the valve housing 43 into the diaphragm. At that time, the fluid flows into the case 41 from the outside through the ventilation hole 41a provided in the case 41.

The pump of the invention of the above patent application is a preferable structure for downsizing and assembling the pump because the discharge valve has a simple structure and is flat.

However, the pump of the above invention has a problem of noise due to the opening and closing of the discharge valve when the pump action is performed.

As described above, the present invention provides a diaphragm pump in which the discharge valve is flat and has a simpler structure, and the valve can be easily arranged and fixed and the pump can be easily assembled.

The present invention also provides a diaphragm pump capable of suppressing the generation of noise in the discharge valve during the operation of the pump.

[0025]

A diaphragm pump according to the present invention has a plurality of diaphragm portions forming a pump chamber, which are connected to each other by a flat plate-shaped portion and are integrated into one diaphragm portion. The discharge valve has an extremely simple structure in which the suction valve is provided correspondingly, the discharge valve is provided in the center of the plurality of diaphragms, and the valve housing for holding the discharge valve. It is characterized in that the valve is fixed by a valve presser that presses at a position other than the position of each diaphragm part.

The diaphragm pump of the present invention has a very simple structure in which the discharge valve is made of an elastic material such as rubber and has a flat plate-like structure, and in order to fix this, it is a very simple structure in which it is fixed only by a valve retainer. Moreover, it can act as an independent valve for each diaphragm portion (pump chamber).

Further, in another diaphragm pump of the present invention, each diaphragm portion 12 is made to correspond to a diaphragm body having a plurality of diaphragm portions forming a pump chamber and connecting them at a flat plate portion to be integrated. And a valve housing for arranging the discharge valve provided at the center of the plurality of diaphragms, wherein the discharge valve is a flat plate and has at least two ribs extending radially and a positioning protrusion. Alternatively, the valve housing may have a concave portion and a concave portion or a convex portion, and the convex portion or concave portion of the discharge valve and the concave portion or convex portion of the valve housing may be fitted to each other to correctly position the discharge valve on the valve housing. It is characterized in that it is held in the state.

Further, the diaphragm pump of the present invention is constructed as described above, and the discharge valve is provided with a recess in the valve portion which acts as the valve, whereby the discharge valve during pump operation is provided. It was made to suppress the generation of noise due to the opening and closing action of the.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described.

FIG. 1 is a sectional view of the first embodiment of the present invention, in which 1 is a motor, 2 is an output shaft of the motor 1, 3 is a crank base fixed to the output shaft 2, and 4 is a crank base 3. A drive shaft that is tilted and attached to the drive shaft, 6 is a drive member that is rotatably attached to the drive shaft 4, 7 is a case having a vent hole 7a, 8 is a cylinder part, 9 is a valve housing, 10 is a plurality of diaphragm parts 11 Diaphragm body that is integrally connected
2 is a drive part (piston) provided in the diaphragm part 11, 13 is a pump chamber, 14 is a discharge valve, and 15 is a discharge port 1.
6 and a valve retainer 17.

In the diaphragm pump of the first embodiment, the crank base 3 is rotated by the rotation of the output shaft 2 driven by the motor 1 as in the diaphragm pump of the invention of Japanese Patent Application No. 2002-19900. Due to the rotation of the crank base 3, the drive shaft 4 changes its inclination direction, and the drive body 6 also changes its inclination direction. As a result, the drive portion 12 of the diaphragm portion 11 reciprocates to perform a pumping action. That is, the reciprocating motion of the drive unit 12 opens the intake valve to allow the gas to enter the case 7 through the vent hole 7a of the case 7, and further to open the intake valve through the vent hole provided in the cylinder section to open the diaphragm section 11 ( After entering the pump chamber 13), the discharge valve 14 is opened, and the gas is supplied from the discharge port 16 of the valve housing 9 to the outside through the vent hole 9a.

Although not shown in FIG. 1 for a vent hole, a suction valve, etc. of the cylinder portion, it is substantially the same as the diaphragm pump of the above-mentioned patent application shown in FIGS. 8 to 12. However, the diaphragm pump of FIGS. 8 to 12 is a pump having three diaphragm parts (pump chambers), whereas the pump shown in FIG. 1 is a pump having two diaphragm parts. Therefore, although the two diaphragm portions are arranged 180 ° apart and the arrangement positions are different, the pumping action is substantially the same.

In the diaphragm pump of the first embodiment, the discharge valve 14 has a simple flat plate shape, and the convex portion 14c formed at the center of the discharge valve 14 is fitted into the concave portion 9c of the valve housing 9. Then, the discharge valve 14 may be fixed at the center of the valve housing and fixed by the valve retainer 17 provided on the gas collection 15. That is, the discharge valve 14 is arranged in the center of the valve housing 9 and the valve housing 9
The discharge valve 14 is held and fixed by the valve retainer 17 by the work of only fixing the gas collector 15 to the. The discharge valve 14
It is not necessary to provide the convex portion 14c, but it is preferable to provide the convex portion 14c because the arrangement in the valve housing becomes easier.

The discharge valve 14 of the diaphragm pump according to the first embodiment has a flat surface on the valve housing 9 side as shown in FIG. 1, and the entire surface is in contact with the surface of the valve housing. Therefore, noise may occur when the discharge valve 14 is opened and closed by the pump action.

FIG. 2 shows various configurations of the discharge valve 14 used in the diaphragm pump of the present invention.

FIG. 2A shows the discharge valve used in the first embodiment. The discharge valve 14 shown in FIG. 2 (A) has an extremely simple structure, and has a flat plate shape as a whole, and the side indicated by an arrow A is a flat surface. Therefore,
This discharge valve is provided with the valve housing 9 as described above.
By disposing the air collecting hole 15 in the central portion of the air collecting member 15 and attaching the gas collecting member 15 to the valve housing 9, the valve holding member 17 of the gas collecting member 15 holds and fixes the discharge valve 14 at a portion other than the vent hole 9a. do it. See also FIG.
(B) is the discharge valve shown in (A), which is provided with a recess for noise prevention. That is, the concave portion 14b is provided on the surface of the valve portion 14a of the valve 14 that is in contact with the valve housing 9. By providing this concave portion 14b, the discharge valve 14
The noise generated when opening and closing can be significantly reduced.

As described above, when the concave portion 14b is provided on the surface of the discharge valve on the valve housing side, that is, the surface on the arrow A side in FIG. 2, the concave portion 14b and the vent hole 9a of the valve housing 9 need to be aligned with each other. is there. Therefore, the discharge valve shown in FIG. 2B is provided with a convex portion 14c, and the discharge valve 14 is provided in the valve housing 9 so that the convex portion 14c of the discharge valve 14 and the concave portion 9c of the valve housing 9 are fitted to each other. A pump having two diaphragm parts (pump chambers), or four diaphragm parts (pump chambers), which are installed, and whose convex portions 14c are, for example, shaped such that one direction is different from the direction perpendicular to this It is possible to position a pump or the like having a.

FIG. 3 is a diagram showing a second embodiment of the present invention.

The diaphragm pump of the second embodiment differs from that of the first embodiment in the structure of the discharge valve.
The other configurations are substantially the same.

That is, the second part of the diaphragm pump of the present invention.
The discharge valve used in this embodiment is shown in FIG. In FIG. 4, (A) is a plan view and (B) is
Is a cross-sectional view and (C) is a bottom view.

In the discharge valve shown in this figure, 14a is a valve portion which acts as a valve, 14b is a concave portion formed on the surface of the valve portion 14a which is in contact with the valve housing, and 14c is for mounting the discharge valve and its positioning. The convex portion 14d used for the purpose is a rib.

As shown in FIGS. 3 and 4, in the second embodiment of the present invention, the discharge valve used in the second embodiment is provided with the recess 14b on the valve housing side surface thereof. Of the surface on the valve housing side, only the peripheral portion of the recess 14b is in contact with the surface of the valve housing 9, and the portion in contact with the valve housing is small. Therefore, generation of noise due to opening and closing of the valve can be suppressed.

In this discharge valve, the mounting portion (convex portion) 14c has a rectangular shape. Then, the valve housing is formed with a concave portion of the same shape into which the convex portion 14c is fitted.

It is desirable that the discharge valve 14 has a recess 14b formed on the surface on the valve housing side, and the vent hole 9a of the valve housing 9 is located in the recess 14b of the discharge valve 14.

As shown, the projection 14c of the discharge valve 14
Is formed in a rectangular shape and the recess 9c of the valve housing 9 is also formed in the same shape, so that the discharge valve 14 is attached to the valve housing by fitting the projection 14c into the recess 9c of the valve housing 9. This allows
The discharge valve 14 is attached to the valve housing 9, and the vent hole 9a of the valve housing 9 is located near the center of the recess 14b of the valve portion 14a of the discharge valve 14.

The discharge valve 14 used in the diaphragm pump of the second embodiment has a crossed rib 14d as shown in FIG. 4 (A). The discharge valve 14 shown in FIG. 4 has a structure in which the larger angle α between the crossed ribs 14d is a valve portion 14a, and a recess is provided on the valve housing side surface thereof. Here, if the angle α is large, it is easy to open and close the valve. However, if the angle α is too large, the valve may not close completely. Therefore, it is preferable that the angle α be an appropriate value depending on the purpose of use and other factors.

The diaphragm pump of the second embodiment has two diaphragm parts (pump chambers).

However, the ribs of the discharge valve 14 may be crossed at equal intervals, that is, the angle α may be set to 90 degrees to form a pump having four diaphragm portions (pump chambers).

It can also be applied to a diaphragm pump having three diaphragm parts (pump chambers).

FIG. 5 shows a discharge valve having a configuration slightly different from the discharge valve used in the diaphragm pumps of the first and second embodiments.

The discharge valve of FIG. 5 is used for a pump having three diaphragm parts.
The left side is a plan view and the right side is a sectional view.

Each of these discharge valves is provided with a recess 20b on the valve housing side surface (the right side surface of the right sectional view) of the valve portion 20a, which is one of the features of the present invention. By providing this recess 20b, noise generated when the valve is opened and closed is suppressed.

Of these discharge valves, FIG. 5A has a rib 20d and a valve mounting portion 20e. Then, the discharge valve is fixed by press-fitting the valve mounting portion 20e into the mounting hole of the valve housing or the like to mount the discharge valve on the valve housing and pressing the rib 20d with a valve retainer provided in the gas collection. Is.

The discharge valve shown in FIG. 5B has a valve mounting recess 20f. Further, the valve housing is provided with a convex portion and the discharge valve is attached to the valve housing. That is, after fitting the concave portion 20f of the discharge valve to the convex portion of the valve housing, the discharge valve is pressed by the valve holder for collecting gas to fix the discharge valve to the valve housing.

On the contrary, in the discharge valve of FIG. 5C, a convex portion 20g is formed as a valve mounting portion and a concave portion is formed in the valve housing, so that the convex portion 20g of the discharge valve and the concave portion of the valve housing are formed. After fitting, the discharge valve is pressed and fixed by the valve for collecting gas.

Further, (D) of FIG. 5 is a discharge valve shown in (C), in which the valve portion and a part of the rib are separated, and the rest is substantially the same as the discharge valve of (C).

Further, the discharge valve shown in FIG. 5 (E) has a recess 20h formed above the valve (on the gas collecting side). Then, as in the diaphragm pump shown in FIG. 6, a rod-shaped valve retainer 17 provided in the gas collector 15 is inserted into the recess of the discharge valve to retain the discharge valve, and the discharge valve is fixed and held in the valve housing 9. To do. That is, in the pump shown in FIG. 6, the gas collection 15 supports the rod-shaped valve retainer 17 by the support portion 18 as shown in (B), and the fluid passes through the space 19 between the support portions 18 to discharge the fluid from the discharge port 16. It is a structure to supply. Then, as described above, the rod-shaped valve retainer 1
7 is inserted into the recess 20h to fix the discharge valve 20.

The discharge valves shown in FIGS. 5A to 5E described above each have a recess 20b formed on the surface of the valve portion 20a on the valve housing side. By providing the recess 20b, the diaphragm pump provided with these discharge valves can suppress the noise generated by the opening and closing of the discharge valves when performing the pumping action.

Further, since these discharge valves have the recesses 20b, it is necessary to make the positions of the recesses 20b coincide with the vent holes 9a of the valve housing 9 when disposing the discharge valves when assembling the pump. . Therefore, positioning means is required.

The discharge valves shown in FIGS. 5A to 5E are used in a diaphragm pump having three diaphragm portions (pump chambers). Therefore, the illustrated discharge valve 20 has three valve portions 20a and similarly has three concave portions 20b.

From the above, as the positioning means of these discharge valves 20, for example, triangular convex portions or concave portions are provided in the discharge valve, and the valve housing 9 has the same shape and size as the triangular convex portions or concave portions. It is possible to perform positioning by forming a concave portion or a convex portion of the ridge and fitting them.

For example, in the discharge valve of FIG. 5 (A), a step portion 20k is provided on the valve housing side, and the outer peripheral portion of the step portion 20k is formed in a triangular shape so that the triangular concave portion of the valve housing is assembled. Positioning becomes possible by fitting it to.

The discharge valve shown in FIG. 5B has a recess 20f.
The cross-sectional shape in the horizontal direction (the cross-sectional shape perpendicular to the vertical plane of the drawing in the figure) has a triangular shape or a shape that can be positioned in three directions similar thereto, and is the same as the concave portion such as a triangular convex portion on the valve housing. It becomes possible to perform positioning by forming a convex portion having a shape and size and fitting the concave portion and the convex portion.

Further, in the discharge valve shown in FIGS. 5C and 5D, the horizontal cross-sectional shape of the convex portion 20g (the cross-sectional shape perpendicular to the paper surface in the vertical direction of the drawing) is triangular or similar. If the valve housing has a cross-sectional shape that allows positioning in three directions, and a concave portion of the same shape is formed in the valve housing, and the convex portion 20g of the discharge valve 20 is fitted in the concave portion, the discharge in the positioned state is performed. The valve can be held and fixed.

Further, the discharge valve of FIG. 5 (E) is provided with a step portion 20k similarly to the discharge valve of FIG. 5 (A), and the shape of this step portion is a shape which can be positioned in three directions, for example, a triangle. A recess having the same shape and size as the above may be formed in the valve housing. By fitting the step portion 20k of the discharge valve 20 into the recess of the valve housing, the discharge valve can be held and fixed in the positioned state.

As described above, in the diaphragm pump of the present invention, in the case where the discharge valve has the concave portion for preventing noise, the concave portion and the convex portion (convex portion) which are fitted to the discharge valve and the valve housing in which the discharge valve is arranged are fitted to each other. (Parts and recesses) are formed, and the recesses and protrusions can be positioned by forming a rectangle, a triangle, a quadrangle, or the like according to the number of diaphragm portions (pump chambers) of the pump.

[0067]

In the diaphragm pump of the present invention, the discharge valve has a flat plate shape, the pump can be miniaturized, and if the valve portion for opening and closing the valve is provided with a recess, the discharge valve can be opened and closed. The generated noise can be reduced.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a shape of a discharge valve used in the first embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a shape of a discharge valve used in a second embodiment of the present invention.

FIG. 5 is a diagram showing an example of a discharge valve used in the diaphragm pump of the present invention.

FIG. 6 is a diagram showing a diaphragm pump using the discharge valve shown in FIG.

FIG. 7 is a diagram showing a configuration of a conventional diaphragm pump.

FIG. 8 is a diagram showing a configuration of a diaphragm pump of Japanese Patent Application No. 2002-19900.

9 is a diagram showing a diaphragm body of the pump shown in FIG.

10 is a diagram showing a cylinder portion of the pump shown in FIG.

11 is a diagram showing a valve housing of the pump shown in FIG.

FIG. 12 is a diagram showing the gas collection of the pump shown in FIG.

[Explanation of symbols]

1 motor 2 output shaft 3 crank base 4 drive shaft 6 driver 7 cases 8 cylinder part 9 valve housing 10 Diaphragm body 11a Diaphragm part 13 pump room 14 Discharge valve 15 Collected gas

Claims (4)

[Claims] 1. A diaphragm main body integrally connecting a plurality of diaphragm parts each forming a pump chamber, and an intake valve provided corresponding to each of the diaphragm parts,
A discharge valve disposed in the central portion of the plurality of diaphragm portions, wherein the discharge valve is one flat plate-shaped portion,
A diaphragm pump which holds the discharge valve by pressing a valve with a valve retainer at a portion other than a valve portion which acts as a valve, and which performs a pump action by reciprocating movement of a driving portion provided in each diaphragm portion. 2. A diaphragm main body integrally connecting a plurality of diaphragm parts each forming a pump chamber, and an intake valve provided corresponding to each of the diaphragm parts,
A discharge valve arranged in the central portion of the plurality of diaphragm parts and a valve housing in which the discharge valve is arranged,
The discharge valve has a rib provided at least other than the valve portion that performs the function of the valve, and a convex portion or a concave portion for positioning,
By having a concave portion or a convex portion in the valve housing, fitting a convex portion or a concave portion for positioning the discharge valve into the concave portion or the convex portion of the valve housing, and pressing the rib of the discharge valve with a valve retainer. A diaphragm pump that holds a discharge valve in a correct position and performs a pumping action by reciprocally moving a drive portion provided in the diaphragm portion. 3. A valve housing for arranging the discharge valve is further provided, wherein the discharge valve has a convex portion or a concave portion for positioning, the valve housing has a concave portion or a convex portion, and the convex portion of the discharge valve. 2. The diaphragm pump according to claim 1, wherein the discharge valve is arranged in a properly positioned state by fitting the recess into the recess or protrusion of the valve housing. 4. The diaphragm pump according to claim 1, 2 or 3, wherein the discharge valve has a recess in the valve portion.