JPH10281070A - Diaphragm pump operating by uniformly distributed load - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate an increase in capacity by making it possible to actuate uniformly distributed load on the substantially whole of a diaphragm by alternately actuating pressurized pressure and reduced pressure on the diaphragm via working fluid which is made to come into contact with the whole of a substantial one side surface of the diaphragm whose peripheral part is fixed to the inside of a pup main body. SOLUTION: When a crank 9 of a motor 13 is removed, a piston is operated in the vertical direction and positive/negative uniformly distributed load is repeatingly actuated on the whole of a substantial one side surface of a diaphragm 4 via working fluid 6 filled between a piston 5 and the diaphragm 4 within a cylinder 122. As a result, the diaphragm 4 deforms into upper and lower waveforms and efficiently and forcibly feeds comparatively large quantity of liquid sucked form an intake 2 from a discharge port 3. At this time, when air is used as working fluid 6, responsiveness is lowered and pulsation of forcibly fed fluid is suppressed. Because the substantially whole part of the diaphragm 4 except the peripheral part fixed to a pump main body 1 deforms, a capacity change can be set to a large degree and an increase in capacity is contrived.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm pump for pumping a fluid, and more particularly, to a diaphragm pump in which a diaphragm is deformed by a working fluid.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, for example, a diaphragm pump used for pumping a sample liquid or a reagent is a circular movable portion of a diaphragm b having a peripheral portion fixed in a pump body a. By connecting a connecting rod d that reciprocates to c and driving the movable part c up and down, the fluid introduced into the pump body a from the inlet e is discharged from the discharge port f.

[0003]

In the above-mentioned conventional diaphragm pump, only the peripheral portion g formed annularly between the peripheral portion of the diaphragm b fixed to the pump body a and the movable portion c is repeatedly deformed. Therefore, stress is locally concentrated and acts on the boundary portions g _{1 and} g ₂ , causing fatigue and poor durability.

Further, since the discharge capacity is based solely on the amount of change in the volume due to the vertical movement of the movable portion c, in order to improve the discharge capacity, the diameter of the diaphragm b must be set to a large value. Growth was not easy.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a diaphragm pump capable of easily improving durability and increasing capacity.

[0006]

According to the present invention, means for solving the above-mentioned problems are constituted as follows. That is, a pump body having an inlet and a discharge port for a fluid to be pumped, a diaphragm having a peripheral portion fixed in the pump body, a working fluid in contact with substantially one entire side of the diaphragm, and the working fluid And pressurizing and depressurizing means for applying a pressurizing force and a depressurizing force to the diaphragm alternately through the diaphragm.

Since the working fluid acts on substantially the entire side surface of the diaphragm with a uniform distribution load, the amount of deformation of the diaphragm can be easily set large, and the capacity can be easily increased.

Further, since substantially the entire diaphragm is deformed by receiving an evenly distributed load, local concentrated stress is prevented from repeatedly acting, whereby the durability can be remarkably improved.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a diaphragm pump according to the present invention which operates with an evenly distributed load. FIG. 1 is a cross-sectional view of a diaphragm pump. Reference numeral 1 denotes a two-piece pump body formed in a circular shape. An upper half 11 has an inlet 2 with a check valve 21 for taking in a fluid to be pumped. Check valve 31 for discharging fluid
And a discharge chamber 3 having an elliptical cross section formed between an upper half 11 and a lower half 12 thereof.
00 is provided. Reference numeral 4 denotes a disk-shaped diaphragm stretched in the pump chamber 100, for example, an elastic synthetic resin sheet such as Teflon (trade name) or synthetic rubber, or a thin-film material deformed by receiving pressure such as a thin metal plate. The peripheral portion is sandwiched and fixed between the flange portion 111 of the upper half portion 11 and the flange portion 121 of the lower half portion 12.

A cylinder 122 is formed integrally with the lower half portion 12 of the pump body 1 described above.
The piston 5 and the diaphragm 4 slidably loaded in the inside
Is filled with a working fluid 6 for deforming the diaphragm 4. As the working fluid 6, for example, water, oil, air, or the like can be used. The above-described piston 5 is connected to a crank 9 via a connecting rod 7, and the crank 9 is attached to an output shaft of a motor 13. The above-described cylinder 122 and piston 5
Constitute the pressurizing / depressurizing means K of the present invention. Also, reference numeral 1
Reference numeral 4 denotes a plug for closing the inlet of the working fluid 6, and reference numeral 15 denotes a plug for closing the air vent.

By operating the piston 5 up and down by the above-described configuration, positive and negative equally distributed loads can be repeatedly applied to substantially the entire side surface of the diaphragm 4, whereby the diaphragm 4 is moved. By deforming alternately so as to have an upwardly convex and downwardly convex wavy shape, a relatively large amount of fluid can be efficiently pumped. In addition, when air is used as the working fluid 6, responsiveness is reduced, but pulsation of the pumping fluid can be suppressed.

Since the entire diaphragm 4 is deformed by an evenly distributed load except for the peripheral portion fixed to the pump body 1, a large volume change can be set, and the capacity can be easily increased.

Further, since the entire diaphragm 4 is easily and flexibly deformed, the followability with respect to the fluctuation pressure of the fluid is extremely good. By adjusting the number of rotations of the motor, the discharge capacity is much wider than before. It is possible to finely adjust with good responsiveness over the range.

Since the diaphragm 4 is always subjected to a uniform distribution load, it is possible to prevent local concentrated stress from repeatedly acting, and to significantly improve the durability.

FIG. 2 shows another embodiment of the diaphragm pump. In this case, the pump body 10 and the pressurizing / depressurizing means K are separated, and three diaphragm pumps are driven by a single pressurizing / depressurizing means K. It is. That is, the pump body 10 has a two-piece structure of an upper half part 101 and a lower half part 102, and a pipe connection flange 103 provided on the lower half part 102 has a pipe 52 connected to the cylinder 51 of the pressurizing / depressurizing means K. The two branch pipes 53 to 55 are respectively connected.

With this configuration, the three diaphragms 4 and 4 are moved via the working fluid 6 by the vertical movement of the piston 5.
… Can be driven in complete synchronization. Further, since the pump body 10 is separated from the pressurizing / depressurizing means K, the pump body 10 is made compact and the degree of freedom in layout is remarkably improved. It is needless to say that the connection configuration between the separated pressurizing / depressurizing means K and the pump body 10 is not limited to the pattern shown in FIG. 2 and may be appropriately selected and designed.

[0017]

As described above, according to the diaphragm pump of the present invention which operates with an evenly distributed load, since the diaphragm is deformed by the working fluid, the uniformly distributed load acts on substantially the entire diaphragm. It is easy to set the amount of deformation of the diaphragm large,
Capacitance can be easily increased, and local concentrated stress can be prevented from repeatedly acting, so that durability can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a diaphragm pump that operates with an evenly distributed load according to the present invention.

FIG. 2 is an overall configuration sectional view showing a different embodiment of the diaphragm pump.

FIG. 3 is a cross-sectional view illustrating an example of a conventional diaphragm pump.

[Explanation of symbols]

1, 10 pump main body, 2 inlet, 3 outlet, 4 ...
Diaphragm, 6 ... working fluid, K ... pressurizing / depressurizing means.

Claims (1)

[Claims] A pump body having an inlet and a discharge port for a fluid to be pumped, a diaphragm having a peripheral portion fixed in the pump body, and a working fluid in contact with substantially one entire side of the diaphragm; A diaphragm pump that operates with an evenly distributed load, comprising: a pressurizing and depressurizing means that alternately applies a pressing force and a depressurizing force to the diaphragm via the working fluid.