JP2003343444A - Valve for small pump, and pump using the same valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a valve used in a small pump such as a diaphragm pump without generating backflow. <P>SOLUTION: This valve is disposed on a valve housing having vent holes respectively communicated with a plurality of pump chambers to cover all the vent holes. A vent hole side surface of the valve is formed recessed to be almost spherical or conical or otherwise. By pressing the valve from the other side of the recessed surface, it is closely touched to the valve housing at least along an outer circumferential part and parts between the vent holes so as to prevent backflow. <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 valve used in a small pump, and more particularly to a valve used as a discharge valve or the like and a small pump having the discharge valve.

[0002]

2. Description of the Related Art The valve of the present invention is used, for example, in a small pump having a structure shown in FIG. Therefore, first, in FIG.
Based on this, the small pump will be described.

In FIG. 5, 1 is a motor and 2 is a motor 1.
Output shaft, 3 is a crank base fixed to the output shaft 2, 4 is a drive shaft obliquely attached to the crank base 3, 6 is a drive member rotatably attached to the drive shaft 4, and 7 is a vent hole 7a. A case having 8; a cylinder part; 9 a valve housing; 10 a diaphragm body integrally connecting a plurality of diaphragm parts 11; 12 a drive part (piston) provided in the diaphragm part; 13 a pump chamber; Discharge valve,
Reference numeral 15 is a gas collector having a discharge port 16 and a valve retainer 17.

In this diaphragm pump, the diaphragm body 10 is as shown in FIG. 6, of which (A) is a plan view and (B) is a side view (cross-sectional view). 7 is a diagram showing the shape of the cylinder portion 8, (A) is a plan view and (B) is a sectional view. Further, FIG. 8 is a plan view of the valve housing 9, FIG. 9 is a gas collection view (A) is a bottom view,
(B) is a sectional view.

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

Next, the diaphragm main body and the cylinder portion of the diaphragm pump shown in FIG. 5 will be described.

First, the diaphragm main body 10 has a structure as shown in FIG. 6, and a plurality of diaphragm portions 11 (three of them are arranged at equal intervals on the circumference as shown in the plan view of FIG. Between the diaphragm portions 11 and the respective diaphragm portions 11, three thin flat valve portions (intake valves) 10c are formed, and holes 10d are formed in each valve portion 10c. The diaphragm body 10 is held by the cylinder portion 8 and the valve housing 9 as shown in FIG.

Further, in the cylinder portion 8, as shown in FIG. 7, a hole 8b is formed between the cylinder 8a in which each diaphragm portion 11 is arranged and the cylinder 8a.

The valve housing 9 has a shape as shown in FIG. In this figure, the valve housing 9 is viewed from the lower side in FIG. 5, and 9a is a vent hole and 9b is a groove.

Further, the gas collecting member 15 has a structure shown in FIG. 9 and has a discharge port 16 and a valve retainer 17 formed radially in three directions from the center.

As shown in FIG. 5, the cylinder body 8, the diaphragm body 10 and the valve housing 8 are held by sandwiching the diaphragm body 10 between the cylinder portion 8 and the valve housing 9.

After holding the diaphragm body 10 in this manner, a discharge valve 14 as shown in FIG. 10, for example, is attached by fitting the convex portion 9c of the valve housing 9 into the concave portion 14c, and further has a discharge port 16. The gas collector 15 is attached to the valve housing 9. In this way, by attaching the gas collection 15 to the valve housing 9, the discharge valve 14 is pressed and held by the valve retainers 17 arranged radially. At this time, the discharge valve 14 is configured to be pressed by the valve retainer 17 between the respective vent holes 9a of the valve housing 9.

In this way, the diaphragm pump shown in FIG. 5 is assembled.

The diaphragm pump shown in FIG. 5 rotates the crank base 3 by the rotation of the output shaft 2 driven by the motor 1. 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 10c 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 10c through the hole 8b provided in the cylinder unit 8 to open the valve. The diaphragm portion 11 passes through the groove 9b formed in the housing 9.
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.

The valve of the present invention is used as a discharge valve of a small pump (diaphragm pump) shown in FIG.

Conventionally, this discharge valve has a structure as shown in FIG. As shown in FIG. 10, the conventional valve 14
5, the surface 14a on the diaphragm side shown in FIG. 5 is a flat surface, and this valve is provided with the convex portion 9 of the valve housing 9 as shown in FIG.
It is arranged by fitting the concave portion 14c into c, and is fixed by pressing the air collecting member 15 with the valve pressing member 17. As described above, the valve retainer 17 presses the portions between the vent holes 9a of the valve housing 9, so that normally when the pressure from the vent holes 9a is not applied, the vent holes are provided with the valve 14a. The valve is opened by the pressure in the vent hole portion that is closed by the surface 14a of the above and is also under the pressure.

When this conventional valve is used as the discharge valve as described above, when the pressure on the gas collecting side of the valve is low, the valve opens slightly, whereby the fluid is pumped from the gas collecting side through the vent hole. There was a drawback that a backflow of flowing to the room side occurred.

[0018]

SUMMARY OF THE INVENTION The present invention provides a small-sized pump valve which has a simple shape, has a good valve opening / closing operation, and can be completely closed even at a low pressure.

[0019]

A small-sized pump valve according to the present invention is a valve which is arranged in a valve housing having ventilation holes communicating with a plurality of pump chambers so as to cover all the ventilation holes. It is characterized in that it has a concave surface on the housing side, and that the valve and the valve housing are always in close contact with each other so as to shield the respective ventilation holes by pressing from the side opposite to the concave surface.

As described above, the valve for a small pump of the present invention is
The surface on the valve housing side is a concave surface, and by pressing this on the opposite side of the valve housing from the part other than the vent hole formed in the valve housing, that is, the part between the vent holes. The concave surface of the valve and the surface of the valve housing are brought into close contact with each other at least at the portion between the vent holes and the peripheral portion of the valve to close the vent holes. Then, when pressure is applied to the pump chamber, the ventilation hole is kept airtightly partitioned, and only the valve surrounding the pressured ventilation hole is opened and the other valves are closed. And acts as a check valve for each pump chamber. Further, when the valve is closed, the pressing force from the side opposite to the valve housing prevents the valve from opening even if the pressure is reduced.

The diaphragm pump of the present invention is characterized in that the valve of the present invention is used as a discharge valve.

In the diaphragm pump of the present invention, the discharge valve has an extremely simple shape, and the discharge valve does not open even if the pressure on the gas collecting side decreases, and there is no risk of backflow of fluid.

[0023]

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

1A and 1B are views showing the shape of the discharge valve of the present invention. FIG. 1A is a sectional view and FIG. 1B is a view of the valve shown in FIG.

As shown in FIG. 1 (A), the valve (discharging valve) 20 of the present invention is a surface on the side on the right side of the drawing which closes the vent hole of the pump (the valve of the small pump shown in FIG. 5). The surface 20a on the housing side is not a flat surface but a spherical concave surface.

The valve according to the first embodiment of the present invention having such a shape is used, for example, as a discharge valve in a small pump (diaphragm pump) shown in FIG. That is,
A convex portion is provided on the valve housing 9 of the pump shown in FIG. 5 and the concave portion 20c of the valve shown in FIG. 1 is fitted into the convex portion to dispose the valve 20 in the valve housing.
The valve 20 is fixed to the valve housing by pressing the vent hole and the part between the vent holes except the vent hole. In this case, the conventional valve shown in FIG.
The surface on the right side of the valve housing is a flat surface on the valve housing side. On the other hand, in the valve of the present invention shown in FIG. 1, the surface 20a on the valve housing side is a concave surface. By pressing the surface 20a of the valve housing with a valve holding member for collecting gas, a portion between the ventilation holes of the valve housing is pressed. , The concave surface spreads and comes into close contact with the surface of the valve housing. That is, it is deformed into a flat shape having substantially the same shape as the discharge valve 14 of the diaphragm pump shown in FIG. As a result, the surface 20a of the valve 20 closes the vent holes 9a of the valve housing 9. Further, when the fluid is delivered from the pump chamber (diaphragm portion) by the operation of the small pump, the valve portion of the vent hole portion, which is a portion other than the portion that is directly pressed, is deformed and the peripheral portion 20b of the valve is opened.
Fluid is pumped out of the valve.

The operation itself of this valve is substantially the same as the conventional valve shown in FIG. However, since the valve of the present invention has the concave surface and presses the valve to bring the valve into close contact with the valve housing, the valve is completely closed even at a low pressure. In particular, the air vent holes, which are the portions of the gas collector that are pressed by the valve retainer, are closely contacted so as to partition the air vent holes, and the peripheral portion 20b of the valve is completely adhered. Therefore, even if the pressure on the gas collection side is low, the peripheral portion 20 is in close contact
There is no risk of backflow without opening b.

In the valve according to the first embodiment of the present invention shown in FIG. 1, the recess 20a has a spherical surface. However, this concave surface is not limited to a spherical surface, and may be another shape such as a curved surface or a conical surface close to a spherical surface. That is, the cross-sectional shape may be a curve other than an arc, a curve close to this, a triangular shape or the like. In any case, when the valve is pressed by the valve retainer, the valve comes into close contact with the valve housing at least radially between the vent holes of the valve housing so that each vent hole is blocked from the other vent holes. . Similarly, when the valve is pressed, the valve concave shape and the valve retainer shape may be such that the entire periphery 20b of the valve comes into close contact with the valve housing 9.

FIG. 2 shows another second valve (discharge valve) of the present invention.
It is a figure which shows the embodiment of.

The valve of this embodiment has a concave surface 20 of the valve 20.
This is different from the valve of the first embodiment in that a convex portion 20d is provided in the central portion of a, and a concave portion 20c is provided in this portion. However, in other respects, it is the same as the valve of the first embodiment of FIG.

That is, the valve of FIG. 2 is arranged in the valve housing such that the convex portion 20d is fitted in the concave portion provided at the corresponding position of the valve housing.
The valve retainer provided for the gas collection shown in (1) fixes the valve housing by pressing it between the vent holes.

Here, the concave surface 20a of the valve 20 is brought into close contact with the surface of the valve housing by pressing the valve 20 against the valve housing with the valve retainer.

Therefore, like the valve of the first embodiment, it is possible to sufficiently close the valve even at low pressure.

FIG. 3 shows a valve according to a third embodiment of the present invention.

The third embodiment has a structure in which a rib 20e is provided between the valve portions acting as valves, and the rib 20e is pressed by a valve presser such as a valve presser for collecting gas. Thus, the concave surface is in close contact with the surface of the valve housing, for example.

The valve of the third embodiment has a rib 20e.
Since the valve is pressed by the valve retainer, the opposite side of the rib 20e is always in close contact with the valve housing or the like. Then, even if the fluid flows from the vent holes to deform the valve portion and open the peripheral portion 20b, the rib 20e portion is always in close contact and airtight. Therefore, the ventilation holes are always in close contact with each other, and the ventilation holes are partitioned in a sealed state.

The valve 20 of the third embodiment is provided with the rib 2
Since the side opposite to 0e is always in close contact with the valve housing or the like, it is not preferable that the ventilation hole is located at that portion or in the vicinity thereof.

Therefore, the valve of this embodiment requires positioning.

The valve shown in FIG. 3 is used as a diaphragm pump having three diaphragm pumps (pump chambers) and is an example of a discharge valve having three valve portions.
Positioning is performed by making f a triangle (regular triangle). The valve housing is provided with a triangular convex portion, and the triangular concave portion 20f of the valve 20 is fitted into the convex portion for positioning.

FIG. 4 shows a valve of another fourth embodiment.
The fourth embodiment has a shape having ribs 20e like the valve of the third embodiment. However, the valve of this embodiment is characterized in that the rib 20g is also provided on the concave surface thereof.

The rib 20g of this valve is at the same position as the rib 20f, but the height of the rib is relatively small. By providing the rib 20g on the inner concave surface, when the valve is pressed by the valve retainer, the inner side is in close contact with at least the rib 20g and the surface of the valve housing. Further, by pressing the rib 20e, the concave surface 20a of the valve 20 approaches the surface of the valve housing, and the peripheral portion 20b of the valve 20 comes into close contact, so that the function as a check valve is reliably performed. .

As described above, the valve of the fourth embodiment needs to be constructed so that the peripheral portion 20b of the valve comes into close contact when the valve is pressed. Therefore, it is not preferable that the height (thickness) of the rib 20g is too large. Also, the rib 20
In order to configure the periphery 20b of the valve to be in close contact with the diaphragm portion when the valve is pressed, the periphery g of the periphery 2b is set as shown in FIG.
It is preferable to set the length to the inside of 0b. As a result, the rib 2 is provided between the vent holes when the valve is pressed.
It is partitioned by 0g, and the part 20 around the rib 20g
b is in close contact with the valve housing as a whole. Therefore, the valve is closed when the fluid pressure from the pump chamber is not applied. Also, when the pressure in the pump chamber increases,
The peripheral portion 20b is opened by the pressure through the vent hole corresponding to the pump chamber, and the fluid flows to the discharge port. At that time, the rib 20g is in close contact with the valve housing 9,
Since it is airtightly partitioned from other ventilation holes, it does not affect other pump chambers.

In the valves of the second to fourth embodiments described above, the concave portion 20a has a spherical shape as in the first embodiment, but the present invention is not limited to this, and a spherical surface close to a spherical surface or It may be a conical concave surface. That is, when the valve is pressed by the valve retainer, the valve closely contacts the valve housing between the respective vent holes of the valve housing, and the air vents are airtightly partitioned, and at least the valve periphery 20b enables the valve housing to closely contact. Any shape will do.

Further, of the above-described embodiments, the third and fourth embodiments shown in FIGS. 3 and 4 each have a rib 20e. Therefore, when this valve is used as the discharge valve of the diaphragm pump as shown in FIG. 5, the valve retainer 17 for the gas collection 15 need not have the configuration as shown in FIG. For example, by pressing the rib 20e with a ring-shaped valve retainer, the object of the present invention can be achieved.

The first to fourth embodiments of the valve of the present invention are as follows.
Any of them can be used in the diaphragm pump shown in FIG. The diaphragm pump using the valve of the present invention as the discharge valve is also a novel invention which can attain the object of the invention.

[0046]

EFFECTS OF THE INVENTION The valve of the present invention has the effect that, even if the pressure is low, the valve does not open and does not flow backward due to the provision of the recess on the valve housing side.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a second embodiment of the valve of the present invention.

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

FIG. 4 is a diagram showing a fourth embodiment of the valve of the present invention.

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

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

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

8 is a bottom view of the valve housing of the pump shown in FIG.

FIG. 9 is a diagram showing a structure of gas collection of the pump shown in FIG.

FIG. 10 is a view showing a conventional discharge valve.

[Explanation of symbols]

20 valves 20a curved surface 20b valve periphery 20c Valve mounting recess 20d valve mounting protrusion 20e rib 20f Positioning part 20g rib

Claims (5)

[Claims] 1. A valve arranged to cover all the vent holes in a valve housing having vent holes communicating with a plurality of pump chambers, wherein the valve has a concave surface on the valve housing side and is opposite to the concave surface. By pressing from the side, the valve and the valve housing are brought into close contact with each other at least between the outer peripheral portion of the valve and each vent hole, and the pressure of the fluid from the vent hole opens the peripheral portion near the vent hole to perform the opening / closing operation. Valve for small pumps. 2. The valve for a small pump according to claim 1, wherein the valve has a rib on a side opposite to the valve housing except a portion corresponding to the vent hole, and presses the rib. 3. The valve for a miniature pump according to claim 1, wherein the valve has ribs between the concave surfaces where the respective vent holes are located. 4. The valve for a miniature pump according to claim 1, 2 or 3, wherein said valve has a positioning means. 5. A diaphragm main body having a plurality of diaphragm parts forming a pump chamber, and a discharge valve arranged to cover all vent holes of a valve housing having vent holes communicating with each diaphragm part, A pump that supplies fluid in the pump chamber to the outside by opening a discharge valve through a ventilation hole by changing the volume of the pump chamber formed by the diaphragm portion with a constant phase difference. A small pump with 2, 3, or 4 valves.