JPH02230989A - Protecting device for diaphragm type air pump - Google Patents

Abstract

PURPOSE:To simplify a structure, secure the operation, and prevent the failure of a pump main body by allowing the claw of a rod to slide a slider, moving the tip of the first terminal into the second recess, and opening a contact when an abnormality occurs. CONSTITUTION:When a diaphragm is broken end the center of vibration of a rod 20 is displaced, its claw 15 is brought into contact with the projection 16 of a slider 4 to move the slider 4. The tip 13 of the first terminal 1 is released from the first recess formed on the slider 4 and moved into the second recess 17 formed at the front and rear of the first recess. In this case, the first terminal 1 is pressed upward against the elastic force to constitute a contact, the second recess 17 is formed deeper than the first recess, thus the tip 13 is moved downward to open the contact, and an electric circuit is turned off. When the diaphragm is broken, the operation of a pump can be immediately stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a protection device for a diaphragm type air pump. More specifically, the present invention relates to a protective device for a diaphragm air pump that is simple in structure, easy to attach to the pump body and easy to maintain, and can be reset, so it can be used repeatedly and is economical.

[Prior Art and Problems to be Solved by the Invention] Conventionally, diaphragm air pumps have been used mainly for oxygen supplementation in fish tanks, household septic tanks, etc., and for sampling test gas in pollution monitoring.

As shown in FIG. 4, such a diaphragm air pump uses magnetic interaction between a permanent magnet provided on the rod (21) and an electromagnet disposed around the outer circumference of the rod (21). 211 is configured to reciprocate in its longitudinal force direction in accordance with the power frequency.Then, the volume of the pump chamber 4 increases and decreases in a counterclockwise manner due to the vibration of the diaphragm Q4 connected to the rod. Air is sucked in and discharged alternately from the left and right sides.

In this type of pump, the strength of the movement of the vibration system including the rod is the most important factor in determining the quality of performance. The movement of the vibration system is strongest in the resonance region where the natural frequency of the vibration system is tuned to the drive power frequency.
In order to obtain such strong movement of the vibration system, the diaphragm is provided with an elastic force commensurate with the weight of the vibration system.

However, the diaphragm gradually undergoes elastic fatigue and breaks due to repeated bending during actual operation of the pump, and not only does it become unable to perform the intended pumping action, but also the vibration system held by the diaphragm is held in place due to the damage to the diaphragm. This causes the pump to continue to vibrate while in contact with the electromagnet on the outer periphery, and eventually wears out and damages each other, making the pump as a whole unusable.

In order to avoid such a situation, it is necessary to immediately stop driving the pump when the diaphragm is damaged.

To this end, it has been considered to detect an abnormality in the displacement of the rod, detect this abnormality, and stop driving the rod. Specifically, it is possible to detect abnormal displacement of the rod using a non-contact sensor such as light or magnetism, but this method is extremely expensive and extremely impractical when considering the cost of the pump body. This is a practical solution.

On the other hand, as shown in FIGS. 5 and 6, the protrusion (40) formed on the rod is used to prevent contact between the protrusion (40) and the auxiliary members (30) and (33) during abnormal operation. , a method of opening a switch contact has been proposed. In this case, the rod moves in a direction perpendicular to the plane of the paper, and the protrusion does not come into contact with the auxiliary member during normal operation.

This method utilizes the fact that when a diaphragm breaks, the center of vibration of the rod shifts to one side of the longitudinal direction of the rod (towards the broken diaphragm).

According to a method that utilizes the contact between the protrusion of the rod and the auxiliary member, initial abnormalities in the rod can be detected reliably and accurately, and the pump can be stopped before damage is caused to components other than the diaphragm. It is considered possible.

However, although the method using the auxiliary member is simple in principle, the type shown in FIG. 3l) is deformed, and the type shown in Figure 6 requires the spring (32) to be installed in a narrow recess, leaving various structural and installation problems. ing.

Furthermore, if the auxiliary member itself is damaged, the electrical circuit will open and the pump will stop operating, so once the protection device is activated, the device will no longer require replacement with a new auxiliary member. Therefore, spare auxiliary members are always required.

The present invention has been made in view of the situation of tilting, and it is an object of the present invention to further improve the conventional protection device, and to provide a protection device that is simple in structure and installation, and can be reset.

[Means for Solving the Problems] The protection device of the present invention drives a diaphragm connected to the rod by electromagnetic vibration of the rod including the permanent magnet based on magnetic interaction between an electromagnet and a permanent magnet. This relates to a protection device for air pumps.

The protective device of the present invention includes a first terminal having at least one convex curved portion, and a second terminal having an end that can form an electrical contact with one end of the first terminal. and a case for accommodating the first and second terminals, and a first recess corresponding to the tip shape of the convex curved portion of the first terminal, and movable in the same direction as the rod. a slider having a protrusion long enough to come into contact with a pawl formed on the upper edge of the rod; the slider being slidably housed, having an upper opening and a lower opening; It consists of a substantially cylindrical holder fixed to the lower surface, and when the pump is in normal operation, the tip of the convex curved portion is accommodated in the first recess of the slider through the upper opening, and the contact point is is closed, and when an abnormality occurs, the claw of the rod comes into contact with the protrusion of the slider that protrudes from the lower opening and slides the slider, and the first
The contact point is opened by moving the tip of the terminal into a second recess formed before and after the first recess.

[Function] The protection device of the present invention opens the contact by utilizing the elastic force of the terminal itself. That is, during normal operation, the first terminal having at least one convex curved portion has the tip of the convex curved portion disposed within the first recess provided in the slider, so that the first terminal has no forced contact. is in contact with the second terminal. However, when the diaphragm is damaged and the center of vibration of the rod moves, the pawl formed on the upper edge of the rod comes into contact with the protrusion of the slider and causes it to slide. As a result, the tip of the first terminal protrudes from the first recess and moves into the second recess formed before and after the first recess. During this gap, the first terminal was brought into contact with the second contact against its elastic force, so by moving into the second recess, it returned to its original shape and the contact opened. state.

[Example] Hereinafter, the protection device of the present invention will be explained in detail based on the attached drawings.

FIG. 1a is an explanatory sectional view of one embodiment of the protection device of the present invention during normal operation, and FIG. 1b is an explanatory sectional view of the protection device shown in FIG. 1a during abnormal operation.

In Figures 1a and 1b, (A) is an embodiment of the protection device of the present invention, and the protection device (^) includes a first terminal (1), a second terminal (2), a case ( 3), a slider (4) and a holder (5).

Each component will be explained in order below.

The first terminal (1) and the second terminal (2) constitute a part of the electric circuit of the pump, and are made of highly elastic and highly conductive materials such as veryream for springs and phosphor bronze for springs. Made of low resistance material. The first terminal (1) has a convex curved portion (6) (sword). Among these, the convex curved portion (7) is a portion that imparts elastic force to the first terminal, It is not necessary to adopt the shape shown in the drawings as long as the shape can impart elastic force.On the other hand, the convex curved portion (6) is a first recess formed in the slider (4), which will be described later. This is the part that engages with (8).

A contact is formed by one end (9) of the first terminal (1) and one end of the second terminal (2). Note that both terminals (
The other ends of 1) and {2 are each pulled out of the case (3).

The case (3) has a first terminal (1) and a second terminal ('
This is the part that accommodates 2J, and is made of synthetic resin such as ABS and PBT.

? The base (3) is one side (lower side in Figure 1a)
is open, and an upper opening (1
1) and a holder (with a lower opening (121) formed therein)
5) is fixed by an appropriate means such as adhesive. The holder (5) is made of synthetic resin such as ABS or PBT. The holder (S) has a substantially cylindrical shape so as to accommodate the slider (4).

A slider (4) made of synthetic resin such as 6,6-nine, polyethylene, or boriacetal is slidably disposed within the holder (5).

A first recess (8) corresponding to the shape of the tip 0 of the convex curved portion (6) of the first terminal (1) is formed on the side of the slider (4) on the case (3) side. During normal operation, the tip 0 is housed in the first recess (8).

The slider (4) is movable in the same direction as the rod. The slider (4) has a protruding portion ■■■ long enough to come into contact with the pawl formed on the rod upper edge 04) at approximately the center of the side portion on the rod ■ side, and this protruding portion aθ projects downwards (in the direction of the rod) through the lower opening (12).

The spacing between the old pawls of rod ■ is such that while rod ■ is operating normally, the pawl η does not come into contact with the protrusion (g) of the slider (4), and the diaphragm is damaged and the center of vibration of the rod is When it moved, the nail came into contact with the protruding part,
It may be selected as appropriate in consideration of the amplitude of the rod (2) so as to move the slider (4).

Next, the operation of the protection device of the present invention will be explained with reference to FIGS. 1a and 1b.

Figure 1a shows the state of the protective device during normal operation, in which the tip C of the first terminal (1) is in the first recess (8) formed in the slider (4). The contacts are closed and energized. In this case, since the tip 0 is located within the recess (8), a malfunction such as opening of the contact point does not occur due to minute vibrations caused by the reciprocating movement of the rod.

Then, when the diaphragm is damaged and the center of vibration of the rod ■ is shifted to one side, the rod ■ nome b comes into contact with the protrusion OQ of the slider (4) and pushes the protrusion (g), causing the slider (4) to move. move it. When the slider (4) moves, the tip of the first terminal (1) moves away from the first recess (8) formed in the slider (4), and moves forward and backward of the first recess (8). It moves into the second recess rib formed in the front and back of the slider's moving direction. Due to this gap, the first terminal (1) was pushed upward against its elastic force to form a contact point, and the second recess side was pushed further than the first recess (8). Since the tip is formed deeply, the tip moves downward, opening the contact and turning off the electrical circuit.
). Thus, if the closing diaphragm breaks, the pump is immediately shut down.

Next, other embodiments of the protection device of the present invention will be described.

The protective device (B) shown in Figures 2a and 2b is
The first one except that the number of protrusions η of the slider (4) is 2, and the number of claws formed on the rod ■ is 1.
The configuration is similar to the embodiment shown in Figures a and 1b. When such a configuration is adopted, the structure of the rod (2) becomes simple, and there is an advantage that it can respond to different amplitudes by simply changing the width of the pawl.

As shown in Figure 2a, if an elastic material such as rubber is attached to the side surface of the protrusion (to) of the slider (4) using an adhesive, contact vibration can be alleviated and the diaphragm can be It has the effect of accumulating force on the verge of breakage.

The protection device of the present invention can be mounted on a part of the pump body, for example on the electromagnetic coil, using screws, as shown in FIG. Although the fixing means and the fixing location are not particularly limited in the present invention, it is preferable to attach the electromagnetic coil as a cantilever from one side as shown in FIG.

Although the above description has been made based on specific embodiments, the protection device of the present invention is not limited to such embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, the curved portion of the first terminal (1) may have various shapes such as a parabolic shape in addition to the illustrated sine curve shape. Moreover, appropriate shapes of the case, slider protrusion, etc. can be adopted.

[Effects of the Invention] As explained above, since the protection device of the present invention has a simple structure, it is easy to install and maintain, and has the advantage that it operates reliably and prevents failure of the pump body. There is.

Furthermore, since it can be reset, it can be used repeatedly and is extremely economical.

[Brief explanation of the drawing]

FIG. 1a is a cross-sectional explanatory diagram of one embodiment of the protection device of the present invention during normal operation, FIG. 1b is a cross-sectional explanatory diagram of the protection device shown in FIG. 1a during abnormal operation, and FIG. 2b is a sectional explanatory diagram of another embodiment of the protective device during normal operation, FIG. 2b is a sectional explanatory diagram of the protective device shown in FIG. 2a during abnormal operation, and FIG. FIG. 4 is a plan view of a general diaphragm air pump, and FIGS. 5 and 6 are schematic explanatory views of a conventional protection device. (Main symbols in the drawing) (A), (B): Protective device (1) 2nd terminal (2): 2nd terminal (3): Case. 4): Slider (5): Holder (6): Convex curved portion (8): First recess m: Second recess Patent applicant Takatsuki Electric Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. Based on magnetic interaction between an electromagnet and a permanent magnet,
A protection device for an air pump that drives a diaphragm connected to the rod by electromagnetic vibration of the rod including the permanent magnet, the first terminal having at least one convex curved portion; a second terminal having an end that can form an electrical contact with one end of the terminal; a case accommodating the first and second terminals; and a tip shape of the convex curved portion of the first terminal. The first corresponding
a slider that has a recess, is movable in the same direction as the rod, and has a protrusion at approximately the center of a length that can come into contact with two pawls formed on the upper edge of the rod; a substantially cylindrical holder that slidably accommodates the pump, has an upper opening and a lower opening, and is fixed to the lower surface of the case, and during normal operation of the pump, the convex curved portion The tip is received in the first recess of the slider through the upper opening, and the contact is closed, and when an abnormality occurs, the claw of the rod comes into contact with the protrusion of the slider that protrudes from the lower opening. Slide the slider and
A protection device for a diaphragm type air pump, characterized in that the terminal is moved into a second recess formed before and after the first recess to open the contact. 2. The protection device according to claim 1, wherein an elastic material is attached to a side surface of the protrusion of the slider. 3. The protective device according to claim 2, wherein the elastic material is rubber. 4 Based on the magnetic interaction between electromagnets and permanent magnets,
A protection device for an air pump that drives a diaphragm connected to the rod by electromagnetic vibration of the rod including the permanent magnet, the first terminal having at least one convex curved portion; a second terminal having an end that can form an electrical contact with one end of the terminal; a case accommodating the first and second terminals; and a tip shape of the convex curved portion of the first terminal. The first corresponding
It has a recess, is movable in the same direction as the rod, and is long enough to come into contact with one pawl formed on the upper edge of the rod. A substantially cylindrical holder that slidably accommodates the slider, has an upper opening and a lower opening, and is fixed to the lower surface of the case, and when the pump is in normal operation. is a slider in which the tip of the convex curved portion is accommodated in the first recess of the slider through the upper opening, the contact is closed, and the claw of the rod protrudes from the lower opening when an abnormality occurs. The slider is brought into contact with the protrusion of the first
A protection device for a diaphragm air pump, characterized in that the terminal is moved into a second recess formed before and after the first recess to open the contact. 5. The protection device according to claim 4, wherein an elastic material is attached to a side surface of the protrusion of the slider. 6. The protective device according to claim 4, wherein the elastic material is rubber.