JPS635188A - Diaphragm structure for diaphragm pump - Google Patents

Abstract

PURPOSE:To reduce the load of a motor to enhance the pressure-proof performance of a compressor, by forming a plurality concentric thick and thin wall sections, alternately, in the surface of a diaphragm, excepting parts held by the attaching plate for a connecting rod and a casing. CONSTITUTION:A diaphragm 1 is held at its outer periphery between a pair of upper and lower casing halves 3, 3a which define a pump chamber 2, and is secured in its center section with a connecting rod 4 which is coupled to the rotary shaft of a motor through the intermediary of a cam. Concentric thick and thin wall parts 11, 12 are alternately formed in the surface of the diaphragm 1, excepting parts which make contact with an attaching plate 41 for the connecting rod 4 and the pair of upper and lower casing halves 3, 3a. with this arrangement the rigidity of the thick wall sections 11 in the diaphragm 1 exhibit a pressure-proof performs while the thin wall sections exhibit a flexibility to reduce the load of the motor, thereby it is possible to provide a diaphragm pump having a high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a diaphragm structure that has both flexibility and rigidity.

(b) Conventional technology FIG. 4 is a sectional view showing the diaphragm pump.

The diaphragm pump has a pair of upper and lower half-closed cases 51.5
2 are combined to form a pump chamber 53 inside, and a diaphragm 54 is provided in this pump chamber 53. The diaphragm 54 is formed into a thin disk shape, and its outer peripheral edge is held between the upper and lower half-closed cases 51 and 52,
A connecting rod 55 is fixed to the central portion. This connecting rod 55 is connected to a rotating shaft 58 of a motor 57 via a cam 56.

When the motor 57 is driven, the rotating shaft 58 rotates, and this rotational force causes the connecting rod 55 to reciprocate linearly.

As a result, the diaphragm 54 reciprocates (moves up and down) relative to the pump chamber 53 to increase and decrease the pressure in the pump chamber 53.

When the diaphragm 54 is pushed into the pump chamber 53,
The exhaust valve part (not shown) of the diaphragm 54 opens, high pressure air is sent out from the exhaust port 60, and the diaphragm 5
4 retreats (rises) with respect to the pump chamber 53, the intake valve portion 61 of the diaphragm 54 opens the intake port 62, and outside air is introduced into the pump chamber 53.

The Guyaphram used in this diaphragm pump is
Usually, the structure shown in FIG. 5 is used.

The diaphragm 54 is made of rubber and has a disk shape, and its outer periphery is held between the upper and lower half-cases 51 and 52 and has a flat thin plate shape.

(c) Problems to be solved by the invention In order to increase pressurization efficiency, the diaphragm has pressure resistance to pressurize the pump chamber and flexibility to reduce the load on the drive source (motor). is required.

However, the conventional diaphragm described above has a flat thin plate shape and has a uniform thickness in cross section (see FIG. 5).

For this reason, it has been extremely difficult to provide the diaphragm with flexibility and rigidity (which are originally contradictory properties).

For example, if the diaphragm is made thick, it becomes rigid and has high pressure resistance, but it lacks flexibility, places a high load on the drive source, and requires the use of a drive source with a large output. - On the other hand, if the diaphragm is made thinner, it becomes flexible and the load on the drive source is reduced.
Although it is possible to use a drive source with a small output, it has the disadvantage that it has poor pressure resistance and cannot obtain a sufficient pressurizing effect.

The purpose of this invention is to solve the above-mentioned problems of conventional diaphragms and provide a diaphragm structure that has both flexibility and rigidity, reduces the load on the motor, and exhibits pressure resistance. do.

(d) Means and operation for solving the problem In order to achieve this object, the diaphragm structure of the diaphragm pump of the present invention has the following configuration.

The diaphragm structure has a diaphragm connecting rod placed inside the pump chamber of the pump case that moves directly via a cam.
This is a diaphragm pump that sends compressed air from a pump chamber by reciprocating a diaphragm, and the diaphragm is configured with a plurality of thick-walled parts and thin-walled parts.

In a diaphragm structure having such a configuration, a plurality of thick parts that bulge outward within the plane of the diaphragm and a thin part that is sandwiched between the thick parts and form a valley are integrally provided, The surface has a corrugated structure. Therefore, when the diaphragm reciprocates (moves up and down) relative to the pump chamber, the thick portion exhibits rigidity against the high pressure in the pump chamber and functions to pressurize the air. - On the other hand, the thin wall portion exhibits flexibility against compressive and tensile forces applied to the diaphragm, and functions to reduce the load on the motor. In this way, it is possible to achieve the maximum pressurizing effect with the minimum driving force.

(E) Embodiment FIG. 1 is an enlarged sectional view showing a specific embodiment of a diaphragm according to the present invention.

The diaphragm 1 is attached to a pair of upper and lower halves 3.3a that form the pump chamber 2, with its outer peripheral edge being sandwiched therebetween.

The diaphragm l is made of rubber and has a circular planar shape, and is shaped like a thin plate when held between the upper and lower half-housing cases 3.3a. And this diaphragm 1
A connecting rod 4, which is connected to the rotating shaft of the motor via a cam, is fixedly attached to the center of the motor.

A feature of this embodiment is that a plurality of thick portions 11 and thin portions 12 are formed within one surface of the diaphragm 1.

At the center of one side of the diaphragm 1 is a mounting plate 4 for the connecting rod 4.
1 are fixed (adhered) together, and a plurality of convex stripes are bulged out in a circumferential manner within the surface of the outer peripheral part to form a ring-shaped thick part 11 surrounding the mounting plate 41. Ring-shaped thin parts 12, that is, recessed parts, are provided between the thick parts 11, and are arranged concentrically.

In this embodiment, concentric thick-walled portions 11 and thin-walled portions 12 are provided in a concave and convex manner within the plane of the diaphragm 1, excluding the portions sandwiched between the mounting plate 41 of the connecting rod 4 and the upper and lower half-housing cases 3.3a. However, it goes without saying that the thick and thin portions 11 and 12 may be formed over the entire surface of the diaphragm 1.

FIG. 2 is a sectional view showing another embodiment of the diaphragm l.

In the previous embodiment, the thick portion 11 is provided within one surface of the diaphragm 1.
In this embodiment, a spherical thick part 11 is formed that bulges outward from both sides (front and back surfaces) of the thin plate 13 of the diaphragm 1. A concave thin wall portion 12 having a flat plate 13 as a bottom between the spherical thick wall portions 11
, and the cross-sectional shape as a whole has a continuous bead structure.

In the case of this embodiment, the rigidity of the thick portion 11 is further strengthened, and the pressure resistance performance is improved.

FIG. 3 is a sectional view showing still another embodiment of the diaphragm 1.

In this embodiment, the diaphragm l itself (flat plate 13) is formed into a wave-like shape to have so-called layers, and the ridges of the waveform that are continuous and appear on the surface M (top and bottom) of the substrate 13 are thickened. A thick portion 11 is formed, and a wavy trough bone is formed as a thin portion 12. In the case of this embodiment, the flexibility can be further improved and the restoring force can be strengthened.

In the diaphragm I having such a configuration, when the motor is driven and the rotating shaft rotates, the connecting rod 4 connected to the rotating shaft moves up and down with respect to the pump chamber 2. That is, the diaphragm 1 reciprocates up and down within the pump chamber 2. When the diaphragm 1 is pushed into the pump chamber 2, a compressive force acts on the central portion (mounting plate 41) of the diaphragm 1, and a downward tensile force is applied to the entire diaphragm 1. At this time, the thin wall portion 12 exhibits flexibility and suppresses the load on the motor to the lowest source. Furthermore, as the diaphragm 1 descends,
The air in the pump chamber 2 is pressurized and compressed, and this compression force reacts on the diaphragm 1. At this time, the rigidity of the thick portion 11 exhibits a pressure-resistant effect, further pressurizing the compressed air and sending the air through the exhaust port opened by the exhaust valve. Next, diaphragm 1
When the motor rises again, the thin wall portion 12 exhibits flexibility and reduces the load on the motor.

In this way, no extra load is applied to the motor, and the maximum pressurizing effect can be achieved with the minimum driving force.

(F) Effects of the Invention In the present invention, as described above, the diaphragm is formed with a plurality of thick portions and thin portions.

According to this invention, the thick portion exhibits rigidity, and the thin portion exhibits flexibility. Therefore, by combining rigidity and flexibility, which are originally contradictory, it is possible to cope with the compressive and tensile forces applied to the diaphragm. Design work can be omitted.

Moreover, in this invention, the thick wall portion exhibits pressure resistance and the thin wall portion exhibits flexibility, so no extra load is placed on the drive source, and the maximum pressing force can be obtained with the minimum force of the drive source. The present invention has an excellent effect of achieving the purpose of the invention, such as enabling the use of a drive source with a smaller output.

[Brief Description of the Drawings] Fig. 1 is an enlarged cross-sectional view of the main parts showing an example diaphragm;
FIG. 2 is an enlarged sectional view of the main part showing another embodiment of the diaphragm, FIG. 3 is an enlarged sectional view of the main part showing still another embodiment, and FIG. 4 is a sectional view showing the diaphragm pump. FIG. 5 is an enlarged sectional view of a main part of a conventional diaphragm. 1: Diaphragm, 2: Pump chamber, 3/3a: Upper and lower half-closed case, 11: Thick wall section, 12: Thin wall section. Patent applicant Tateishi Electric Co., Ltd. (Baka 1
Name) Agent Patent Attorney Shigeru Nakamura Shindai 1 Figure 1° Tapai V7 Ram 2, Stone〉7° Room 3, 3Q: Yochogiit Case 11: Saeuchi 12: 1rtiI Department 2q 1゛Dapai 1″7′ :7mu 3"j 11:, ¥9β12.1m Wholesale 4th figure 5

Claims (1)

[Claims] (1) A diaphragm pump in which the connecting rod of a diaphragm arranged in a pump chamber of a pump case is moved directly via a cam, and the diaphragm is reciprocated to supply compressed air from the pump chamber. The diaphragm structure of a diaphragm pump has a thick-walled part and a thin-walled part.