JPS6237982Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a diaphragm type air pump. More specifically, the present invention relates to an air pump that drives a diaphragm using electromagnetic vibration.

The air pump of the present invention is mainly used for supplying air to fish tanks containing tropical fish, but is not limited to the purpose of supplying air; it can also be used in septic tanks, medical care, physics and chemistry, and other fields. can do.

[Conventional technology]

An example of a conventional diaphragm type air pump will be explained based on FIGS. 4 to 6. FIG. 4 shows the overall configuration of a conventional air pump. Base 20
A bowl-shaped cover 21 is attached to the top surface of the air pump, and the main body of the air pump is housed within the bowl-shaped cover 21. The air pump body is attached to a frame 15, and an electromagnet 3 and a drive rod 1 are arranged between the frame 15, and pump chambers 5 are placed at both ends of the drive rod 1.
is located.

The driving principle of this pump utilizes repulsion and attraction that act between an electromagnet and a permanent magnet. A permanent magnet 2 is fixed to the driving rod 1,
The driving rod 1 has two electromagnets 3 placed opposite each other.
is placed between. A diaphragm 4 is attached to each end of the drive rod 1, and the periphery of the diaphragm 4 is fixed to a frame 15. Therefore, the drive rod 1 is supported via the diaphragm 4 in a suspended manner. In the above configuration, if an alternating current is applied to the electromagnet 3,
An alternating magnetic field is generated between the two electromagnets 3, 3, and the permanent magnet 2 is alternately subjected to repulsive force and attractive force. Therefore, the drive rod 1 repeatedly vibrates back and forth in the longitudinal direction.
This is the driving principle.

Note that some conventional air pumps have a diaphragm 4 attached only to one end of the drive rod 1 and have only one pump chamber 5. Even in this type of pump, electromagnetic vibration is used as the driving principle. For example, the other end of the drive rod 1 is pulled with a return spring, etc., and electromagnetic force is applied to the hole to generate reciprocating vibration. It is made to occur.

FIG. 5 shows details around the pump chamber 5 in the two conventional examples. A pump chamber 5 formed into a compartment by a casing 11 is provided on the outside of the diaphragm 4 . This pump chamber 5 is provided with a suction chamber 22 and a discharge chamber 23.
A suction port 6a is bored in the discharge chamber 23, a discharge port 7a is bored in the discharge chamber 23, and a connection port 2 is connected to the air supply pipe 25 (shown in FIG. 4).
4 is formed. A reverse valve 6 is attached to the inside of the suction port 6a, and a check valve 7 is attached to the outside of the discharge port 7a. The reverse valve 6 allows only the intake of air and prevents its discharge, and the check valve 7 allows only the discharge of air and prevents its intake. Therefore, according to the drive principle described above, when the diaphragm 4 vibrates, the volume inside the pump chamber 5 changes accordingly, and air is sucked from the suction chamber 22 and the discharge chamber 23.
is discharged to the outside.

In the above-described diaphragm air pump, the quality of the pump performance is most dependent on the strength of the movement of the vibration system including the drive rod 1. Therefore, in order to strengthen the movement of the vibration system, it has been proposed to attach the diaphragm 4 in a radially outwardly stretched state. This is because if tension is applied to the diaphragm 4 in this manner, the elastic force of the diaphragm 4 itself is added to the driving force caused by the electromagnetic force, thereby improving the vibration driving force.

Therefore, in the conventional air pump, expansion force is applied to the diaphragm 4 by the following configuration. In Figures 5 and 6, 10 is frame 1
5 is a diaphragm mount fixed to the diaphragm mount 10, and a fitting groove 10A is formed in this mount 10.
On the other hand, a fitting protrusion 4A is provided on one side of the diaphragm 4.
is formed, and its inner diameter d is smaller than the inner diameter D of the fitting groove 10A. Therefore, when the fitting protrusion 4A is fitted into the fitting groove 10A, the diaphragm 4 is pulled outward in the radial direction. As shown in FIG. 5, the diaphragm 4 is fixed between a mounting base 10 and a casing 11.

[Problems to be solved by the invention] By the way, in the conventional configuration, the expansion force is applied to the diaphragm 4 only on one side where the fitting protrusion 4A of the diaphragm 4 is formed. As shown in Figure 7,
Due to the force of pulling the diaphragm 4 inward in the radial direction, the inner side of the fitting protrusion 4A may come into contact with the corner of the fitting groove 10A, causing deformation. Furthermore, as shown in FIG. 8, the diaphragm 4 vibrates back and forth at high speed during pump operation, so there is a problem that the degree of deformation increases over long periods of use.

When the diaphragm 4 is deformed, the elastic force applied by the expansion is reduced, resulting in a problem that the pump performance gradually deteriorates. This problem remains the same whether the driving rod 1 drives two diaphragms 4 or one diaphragm 4.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a diaphragm type air pump that can prevent deformation of the diaphragm and constantly maintain elastic force at a predetermined value.

[Means for solving problems]

The diaphragm type air pump of the present invention is an air pump that drives a diaphragm by electromagnetic vibration, and the diaphragm is provided with a fitting protrusion on one side, and the fitting protrusion is fitted into a fitting groove provided in a frame. The diaphragm is held in a state in which tension is applied to expand it radially outward when the diaphragm is engaged, and a ring-shaped engagement protrusion is formed on the other side of the diaphragm, and the inner diameter of the engagement protrusion is A ring having a larger outer diameter is fitted inside the engagement protrusion, and the engagement groove and the ring are configured to maintain the tension acting on the diaphragm at a predetermined value.

The ring of the present invention may be any ring that can provide resistance to prevent the diaphragm from contracting inward in the radial direction. Further, the engaging protrusion may be of any type as long as it can apply tension to the diaphragm radially outward by inserting the ring inside.

The diaphragm type air pump of the present invention refers to a type of pump whose volume changes due to the vibration of a diaphragm, and as long as it has such a base structure, the number of diaphragms attached and the shape of the pump chamber are not limited.

[Effect]

In the present invention, the fitting groove and the fitting protrusion fit together on one side of the diaphragm, and the engagement protrusion and ring fit on the other side, so that the tension that pulls the diaphragm outward in the radial direction is generated on both sides of the diaphragm. has been granted.

Therefore, in the present invention, force is not applied to only one side of the diaphragm, so that the diaphragm is not deformed. In addition, this prevents the elastic force from decreasing due to deformation, and the initial pump performance can be maintained over a long period of time.

〔Example〕

Next, embodiments of the present invention will be described.

Fig. 1 is a sectional view of essential parts of a diaphragm air pump according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the dimensional relationship between the diaphragm, ring, and fitting groove, and Fig. 3 shows the state in which the diaphragm is installed. FIG.

In FIG. 1, 1 is a drive rod and 4 is a diaphragm. The principle and structure for vibrating the drive rod 1 are the same as those of the conventional example, so explanations thereof will be omitted. Further, the configuration of the pump chamber 5 is also the same as that of the conventional example, so a description thereof will be omitted.

The present invention is characterized in that an engaging protrusion 4B is formed on the diaphragm 4, into which a ring 12 is fitted. The explanation will be given below based on FIG. 2.

A fitting protrusion 4A is formed on one side of the diaphragm 4, and an engaging protrusion 4B is formed on the other side. The fitting protrusion 4A is fitted into the fitting groove 10A of the mounting base 10, and the ring 12 is fitted inside the engagement protrusion 4B.

In the embodiment shown in the drawings, a fitting groove 10 is provided in a mounting base 10 fixed to a frame 15 with bolts or the like.
Although the fitting groove 10A is formed in the frame 15, the fitting groove 10A may be formed directly in the frame 15. The term "fitting groove provided in the frame" as used in the claims for utility model registration includes both a fitting groove formed in a mounting base fixed to the frame and a fitting groove formed directly in the frame. It is.

An example using the mounting base 10 will be described below as a representative example. The inner diameter _D1 of the fitting groove 10A formed in the mounting base 10 is the inner diameter of the fitting projection 4A of the diaphragm 4.
d is greater than ₁ . The ring 12 is an annular member. The outer diameter D ₂ of this ring 12 is larger than the inner diameter d ₂ of the engagement protrusion 4B of the diaphragm 4.

FIG. 3 shows a state in which the diaphragm 4 and ring 12 described above are mounted on the mounting base 10. The bottom side of the diaphragm 4 in the figure is a fitting protrusion 4A.
The upper surface side in the figure is pulled radially outward due to the engagement between the engagement protrusion 4B and the ring 12. As described above, the present invention is characterized in that tension is applied to both the front and back surfaces of the diaphragm 4 to expand the diaphragm 4 outward in the radial direction.

FIG. 1 shows a diaphragm 4 installed according to the above configuration. In this invention, ring 1
2 on the other side of the diaphragm 4, no biased force is applied to the diaphragm 4, so that the diaphragm 4 is not deformed.

In a pump of the present invention which uses electromagnetic vibration as its driving force, the natural frequency of the vibration system greatly influences pump performance. Therefore, at the time of design, the mass of the vibration system and the elastic force of the diaphragm 4 are set so that an appropriate natural frequency can be obtained.

According to the present invention, the diaphragm 4 is not deformed, so that the same elastic force can be maintained at all times. Therefore, the natural frequency at the time of design does not change even after long-term use, so the initial performance of the pump can be stably maintained over a long period of time.

In addition, in the present invention, if the natural frequency of the vibration system of the pump is brought close to the power frequency of the alternating current applied to the electromagnet 3, a resonance effect will occur, which also has the effect of increasing the driving force of the pump. be able to.

In this invention, if it is desired to increase the driving force, the design should be made so that the natural frequency and the power supply frequency are as close as possible, as described above, but if the driving force required for practical use can be obtained even if this is not done, then can be used without being limited to a specific power frequency.

[Effect of idea]

In the present invention, since the diaphragm does not undergo deformation, the tension acting on the diaphragm can be maintained at a predetermined value at all times. Furthermore, stable operation for a long period of time can be achieved without degrading the initial performance of the pump.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of essential parts of a diaphragm air pump according to an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the dimensional relationship between the diaphragm, ring, and fitting groove, and Fig. 3 shows the state in which the diaphragm is installed. 4 is a partially sectional perspective view showing an example of a conventional diaphragm type air pump, FIG. 5 is a sectional view of a main part of the conventional air pump, and FIG. 6 is a diaphragm mounting structure of the conventional example. The explanatory diagrams, FIGS. 7 and 8, are explanatory diagrams of the problems of the conventional example. Main symbols in the drawing: 1: Drive rod, 2: Permanent magnet,
3: Electromagnet, 4: Diaphragm, 4A: Fitting protrusion, 4B: Engaging protrusion, 5: Pump chamber, 10: Mounting base, 10A: Fitting groove, 11: Casing, 12:
Ring, 15: Frame.

Claims (1)

[Scope of utility model registration request] An air pump that drives a diaphragm by electromagnetic vibration, wherein a fitting protrusion is provided on one side of the diaphragm, and by fitting the fitting protrusion into a fitting groove provided in a frame, the diaphragm is adjusted to a radius. A ring-shaped engagement protrusion is formed on the other side of the diaphragm and has an outer diameter larger than an inner diameter of the engagement protrusion. A diaphragm type air pump, wherein a ring is fitted inside the engagement protrusion, and the tension applied to the diaphragm is maintained at a predetermined value by the engagement groove and the ring.