JPH0422069Y2 - - Google Patents

Description

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

<Conventional technology> Generally, this type of diaphragm air pump is
As shown in FIG. 5, a pump has a diaphragm 1 made of synthetic rubber stretched between a diaphragm mount 2 and a casing 3 having an inlet 4 with an intake valve 4A and an outlet 5 with a drain valve 5A. The end of a drive rod 8 forming a chamber 6 and having a permanent magnet 7 fixed thereto is fixedly connected to the center of the diaphragm 1, and the drive rod 8 is activated by interaction with electromagnets 9 disposed on both sides of the diaphragm 1.
is reciprocated in the direction of the arrow according to the power frequency,
By increasing or decreasing the volume of the pump chamber 6,
It is configured to suck and discharge air by opening and closing the intake valve 4A and the exhaust valve 5A.

Therefore, 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 source, and as a means of achieving this, the diaphragm 1 is installed by expanding in the radial direction. A method of obtaining the above-mentioned tuning by generating an elastic force commensurate with the weight of the vibration system is adopted.

However, in the conventional diaphragm expansion method, as shown in FIG.
1D, and on the diaphragm mounting base 2 side, an annular groove 2A is formed in which the one annular protrusion 1A having a smaller inner diameter can fit into and has an inner diameter slightly larger than the inner diameter in the free state, and the other annular groove 2A in the free state The ring member 10 having an outer diameter slightly larger than the inner diameter of the protrusion 1D was fitted into the protrusion 1D and pressed down by an annular groove 3D provided on the casing 3 side.

<Problems to be solved by the invention> As shown in FIG. 6, one of the annular protrusions 1A of the diaphragm 1 having a smaller inner diameter is fitted onto the diaphragm stand 2, and a ring member 1 is fitted onto the inner surface of the other annular protrusion 1D.
0 is fitted into the annular groove 3 provided in the casing 3.
When pressing with D, the annular protrusion 1D of the diaphragm 1 and the ring member 10 may be caught in the annular groove 3D without being fitted as shown in Fig. 7, and the elastic force as designed may not be obtained. There was a drawback that the quality of the product was inconsistent.

In view of these circumstances, the present invention aims to reduce the number of parts, facilitate assembly, eliminate variations in pump performance, and stabilize quality.

<Means for solving the problem> The air pump diaphragm expansion and holding device devised to achieve the above purpose has two annular protrusions arranged concentrically on the outer periphery of one side of the diaphragm. The annular recessed groove of the diaphragm is formed so that the thickness of the annular groove is smaller than that of the diaphragm, and an annular protrusion with a small inner diameter can be fitted on the diaphragm mounting base side, so that the annular groove in the free state can be fitted. A pressing protrusion is provided in which an annular groove having an inner diameter slightly larger than the inner diameter of the annular protrusion is formed, and the shape of the diaphragm contacting part of the casing is symmetrical or almost symmetrical to the inner peripheral surface of the diaphragm mounting base. It is characterized by its composition.

<Function> According to the air pump diaphragm expansion and holding device according to the above invention, two annular projections 1A and 1B are provided on one side of the diaphragm 1 as shown in FIG. 2, and as shown in FIG. , insert only one annular protrusion 1A into the annular groove 2 of the diaphragm mounting base 2.
A, the base of the annular projection 1A is pulled radially inward and deformed, but as shown in FIG. By fitting into the annular grooves 2A and 2B, the deformation of the root portion of the diaphragm 1 is corrected, and as shown in FIG. , the initial degree of expansion can be maintained reliably. Furthermore, the holding performance is further improved by roughening the pressing surface 3C of the casing 3 to prevent slipping.

<Example> Examples of the present invention are shown below in the drawings (Figs. 1 to 3).
This will be explained in detail based on Figure).

Two annular protrusions 1A and 1B are protruded concentrically from one side of the outer periphery of a diaphragm 1 made of synthetic rubber, and the thickness t of the annular groove 1C of the diaphragm 1 is equal to the thickness t of the diaphragm 1. The thickness T of the diaphragm is preferably approximately 1/2 smaller than the wall thickness T of the diaphragm, and the annular protrusions 1A and 1B having a small inner diameter can be fitted on the diaphragm mounting base 2 side, so that the wall thickness T in the free state is smaller than the wall thickness T of the diaphragm mounting base 2. Inner diameter d1 of annular projections 1A and 1B,
By forming annular grooves 2A, 2B with inner diameters D1, D2 slightly larger than d2, and fitting the annular protrusions 1A, 1B into the annular grooves 2A, 2B, the diaphragm 1 is formed with inner diameters D1, D2 slightly larger than d2. Difference (ΔD1
=D1-d1) and the difference between the inner diameters D2 and d2 (ΔD2
=D2-d2) so that it can be mounted on the diaphragm mounting base 2, and as shown in FIG. The air pump is completed by fixed connection so as to be pressed by the pressing protrusion 3B and the pressing surface 3C which are symmetrical or almost symmetrical to the inner circumferential surface 2C of the mounting base 2. In FIG. 1, the other components are the same as the general pump shown in FIG. 5, and the same numbers as in FIG. 5 are given to each part for explanation.

<Effects of the invention> (1) As the two annular projections 1A and 1B are provided on one side of the diaphragm 1 as shown in Fig. 1, there is no annular projection on the other side, and when pressing with the casing, there is no need to As shown in Figure 6, it is no longer necessary to fit the annular protrusion 1D of the diaphragm and the ring member 10 into the annular groove 3D of the casing 3, so there is no variation in quality due to pinching, easy assembly, and elasticity as designed. Power can be obtained stably. Furthermore, the conventionally used ring member is no longer necessary, and the cost of parts and assembly of the ring member can be reduced.

(2) When installed, the casing 3
is provided with a pressing protrusion 3B in which the shape of the diaphragm contact portion 3A is symmetrical or almost symmetrical to the inner peripheral surface 2C of the diaphragm mounting base 2 with respect to the diaphragm 1, so that local deformation and wear due to vibration of the diaphragm 1 are prevented. Furthermore, since the pressing surface 3C of the casing 3 is roughened to prevent slipping, the holding performance is improved and the durability of the diaphragm 1 can be increased.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of the main parts of the present invention, Figs. 2 to 4 are enlarged sectional views of the main parts related to diaphragm installation, Fig. 5 is a sectional view of the main parts of a general diaphragm air pump, and Figs. FIG. 7 is an enlarged sectional view of the main part of the conventional example. 1... Diaphragm, 1A, 1B... Annular projection, 1C... Annular groove, 2... Diaphragm mounting base, 2A, 2B... Annular groove, 2C... Inner peripheral surface,
3...Casing, 3A...Diaphragm contact portion, 3B...Press projection, 3C...Press surface.

Claims (1)

[Claims for Utility Model Registration] Two annular protrusions 1A and 1B are concentrically protruded from the outer periphery of one side of the diaphragm 1, and the wall thickness of the annular groove 1C of the diaphragm 1 is t is smaller than the wall thickness T of the diaphragm 1, and the annular protrusions 1A and 1B having a small inner diameter can be fitted on the diaphragm mounting base 2 side, and the inner diameter d1 of the annular protrusions 1A and 1B in a free state is Annular grooves 2A and 2B with inner diameters D1 and D2 slightly larger than d2 are formed, and the shape of the diaphragm contacting portion 3A of the casing 3 is symmetrical or almost symmetrical to the inner circumferential surface 2C of the diaphragm mounting base 2 with respect to the diaphragm 1. A diaphragm expansion and holding device for an air pump, characterized in that symmetrical pressing protrusions 3B are provided. The air pump diaphragm expansion and holding device according to claim 1, wherein the pressing surface 3C of the casing 3 is roughened to prevent slipping.