JP2533169Y2 - Air pump diaphragm extension holding mechanism - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention expands the diaphragm of a diaphragm air pump used for supplying air to the water filled in a septic tank in the radial direction, for example. The present invention relates to a diaphragm expansion and holding mechanism for an air pump mounted on a mounting base.

<Prior Art> Generally, as shown in FIG. 5, a diaphragm air pump of this type includes a casing 3 having a suction port 4 having an intake valve 4A and a discharge port 5 having an exhaust valve 5A, and a diaphragm mounting base 2. A pump chamber 6 having a synthetic rubber diaphragm 1 stretched between them is formed. An end of a drive rod 8 to which a permanent magnet 7 is fixed is fixedly connected to the center of the diaphragm 1, and electromagnets 9 arranged on both sides of the drive rod 8 are fixed. The drive rod 8 is reciprocated in the direction of the arrow according to the power supply frequency by the interaction with the pump chamber 6.
The intake valve 4A and the exhaust valve
The 5A is configured to open and close to perform air suction and discharge.

The performance of this type of pump is best when the natural frequency of the vibration system including the drive rod 8 is tuned to the frequency of the drive power supply. In addition, a method of generating the above-mentioned tuning by generating a resilient force corresponding to the weight of the vibration system is adopted.

However, the conventional diaphragm expansion method is the sixth method.
As shown in the figure, annular projections 1A and 1D having the same outer diameter and a different inner diameter are provided on both sides of the diaphragm 1, and the one annular projection 1A having a smaller inner diameter can be fitted to the diaphragm mounting base 2 side. An annular groove 2A having an inner diameter slightly larger than the inner diameter in the free state is formed, and the other annular protrusion 1D in the free state is formed.
The ring member 10 having an outer shape slightly larger than the inner diameter of the casing 3 is fitted and pressed by the annular groove 3D provided on the casing 3 side.

<Problems to be Solved by the Invention> In the conventional method shown in FIG.
As shown in FIG. 7, the 1D and the ring member 10 are sandwiched in a state where they are not fitted in the annular concave groove 3D, and there are cases where a resilient force cannot be obtained as designed, resulting in a variation in quality. Was.

In view of such circumstances, the present invention abolishes the ring member 10,
An object of the present invention is to provide a diaphragm expansion holding mechanism of stable quality with less variation by reducing the number of parts compared to the conventional art, reducing the number of mounting steps and facilitating assembly.

<Means for Solving the Problems> In order to achieve the above object, an annular projection is integrally provided at an outer peripheral position on one surface of the diaphragm, and the annular projection can be fitted to the diaphragm mounting base side. In the free state, an annular concave groove having an inner diameter slightly larger than the inner diameter of the annular protrusion is formed, and the diaphragm contact portion shape of the casing is symmetrical or substantially symmetrical with the inner peripheral surface of the diaphragm mounting base, and the outer diameter thereof is set. The diaphragm mounting base is provided so as to be located at the center or substantially the center of the inner and outer circumferences of the annular groove, and the diaphragm pressing surface is roughened to prevent slippage.

<Operation> According to the diaphragm expansion and holding mechanism of the air pump according to the invention, when the annular projection 1A of the diaphragm 1 is fitted into the annular groove 2A of the diaphragm mounting base 2, as shown in FIG. The base of the projection 1A is deformed by being pulled inward in the inner circumferential direction. However, since an appropriate gap is provided between the outer circumference of the diaphragm 1 and the outer circumference of the annular groove 2A of the diaphragm mounting base 2, the casing 3 is assembled. As a result, the outer peripheral surface of the diaphragm 1 is in contact with the pressing protrusion 3B of the casing 3 and the pressing surface.
The outer peripheral direction is corrected by 3C, and the step portion between the pressing protrusion 3B and the pressing surface 3C bites into the diaphragm 1 as shown in FIG. 1, so that the initial degree of expansion can be reliably maintained.

<Embodiment> Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings (FIGS. 1 to 4).

At the outer peripheral position on one side of the synthetic rubber diaphragm 1,
An annular projection 1A is integrally provided so as to protrude, and the diaphragm mounting base 2 is provided.
On the side, the annular protrusion 1A can be fitted, and an annular groove 2A having an inner diameter D1 slightly larger than the inner diameter d1 of the annular protrusion 1A in a free state is formed, and the annular protrusion 1A is formed in the annular groove 2A. When the diaphragm 1 is fitted, the difference between the inside diameters D1 and d1 (Δ
D = D1-d1) so that the diaphragm contact part 3A can be mounted on the diaphragm mounting base 2 by extending the diaphragm contact part 3A from above as shown in FIG.
On the other hand, a pressing projection which is symmetric or substantially symmetric with the inner peripheral surface 2B of the diaphragm mounting base 2 and whose outer diameter D3 is the center of the inner diameter D1 and the outer diameter D2 of the annular concave groove of the diaphragm mounting base 2, or almost the center. Pressing surface 3C and pressing protrusion 3B of casing 3 having 3B
The air pump was completed by pressing and fixing with and connecting. In FIG. 1, the other components are the same as those of the general air pump shown in FIG. 5, and each component will be described with the same reference numeral as in FIG.

<Effects of the Invention> (1) As shown in FIG. 1, the annular projection 1D and the ring member 10 on one side of the diaphragm 1 which were conventionally required as compared with FIG.
Therefore, it is not necessary to fit the annular projection 1D and the ring member 10 into the annular groove 3D of the casing 3,
Since the difficult assembling is facilitated, the number of assembling steps can be reduced.

(2) The cost of parts can be reduced by reducing the unit price of the diaphragm 1 made of synthetic rubber and eliminating the ring member 10.

(3) The work of fitting the annular projection 1D extended by the ring member 10 and the annular groove 3D of the casing 3 can be changed to a simple operation of simply holding down the casing. Of the elastic repellency due to the pinching of the material is eliminated, and the quality is stabilized.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of the present invention, FIGS. 2 to 4 are enlarged cross-sectional views of a main part relating to diaphragm mounting, FIG. 5 is a cross-sectional view of a main part of a general diaphragm air pump, FIG. FIG. 7 is an enlarged sectional view of a main part of a conventional example. 1 ... diaphragm, 1A ... annular projection 2 ... diaphragm mounting base, 2A ... annular concave groove, 2B ... inner peripheral surface, 3 ... casing, 3A ... diaphragm contact part,
3B: Pressing protrusion, 3C: Pressing surface.

Claims (2)

(57) [Scope of request for utility model registration] An annular protrusion (1A) is integrally provided at an outer peripheral position on one surface of a diaphragm (1), and the annular protrusion (1A) can be fitted to the diaphragm mounting base (2) side. An annular concave groove (2A) having an inner diameter (D1) slightly larger than the inner diameter (d1) of the annular protrusion (1A) in the state is formed, and the diaphragm pressing surface (3C) and the pressing protrusion (3B) are formed on the casing (3). The outer diameter (D3) of the pressing projection (3B) is equal to the inner diameter (D1) and the outer diameter (D2) of the annular groove (2A) of the diaphragm mounting base (2).
And the shape of the diaphragm contact part (3A) is symmetric or substantially symmetric with respect to the diaphragm (1) with respect to the inner peripheral surface (2B) of the diaphragm mounting base (2). The diaphragm expansion holding mechanism of the air pump. 2. A pressing surface (3C) of said casing (3),
The diaphragm expansion and holding mechanism for an air pump according to claim 7, wherein the surface of the diaphragm is roughened to prevent slippage.