JPH0735781B2 - Diaphragm type air pump protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a protection device for a diaphragm type air pump. More specifically, the present invention relates to a diaphragm-type air pump protection device that has a simple structure, is easy to install and maintain on the pump body, and is resettable, and thus can be repeatedly used and is economical.

[Problems to be Solved by Conventional Techniques and Inventions] Conventionally, diaphragm type air pumps have been mainly used for supplementing oxygen in fish tanks, domestic septic tanks, etc., or sampling inspection gas in pollution monitoring.

As shown in FIG. 4, such a diaphragm type air pump has a permanent magnet (2) provided on a rod (21).
The rod (21) is configured to reciprocate in the longitudinal direction according to the power source frequency by magnetic interaction between 2) and an electromagnet (23) arranged on the outer periphery of the rod (21). Then, the vibration of the diaphragm (24) connected to the rod causes the volume of the pump chamber (25) to increase / decrease in a left-right contradictory manner, whereby air is sucked and discharged alternately in the left-right direction.

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 the performance. And, in the resonance region where the natural frequency of the vibration system is tuned to the drive power frequency, the movement of the vibration system is the strongest,
In order to obtain such a strong movement of the vibration system, the diaphragm is provided with an elastic force corresponding to the weight of the vibration system.

However, the diaphragm is elastically fatigued and damaged due to repeated bending when the pump is actually operated, and the desired pump action cannot be performed, and the vibration system held by the diaphragm is held in place by the damage of the diaphragm. There is a situation in which the pump continues to vibrate while being in contact with the electromagnet on the outer periphery, and eventually wears out and damages each other, making the entire pump unusable.

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

Therefore, it is considered to detect an abnormality in the displacement of the rod, detect this abnormality, and stop the driving of the rod. Specifically, it is possible to detect the abnormal displacement of the rod using a non-contact sensor such as light or magnetism, but this method is extremely expensive, and when considering the cost of the pump body, it is extremely unrealistic. Solution.

On the other hand, as shown in FIGS. 5 to 6, the protrusion (40) formed on the rod is used to contact the protrusion (40) with 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 the direction perpendicular to the paper surface, and the protrusion does not come into contact with the auxiliary member during normal operation. This method utilizes the fact that, when the diaphragm is broken, the center position of vibration of the rod is biased to one side in the longitudinal direction of the rod (direction of the damaged diaphragm).

According to the method of utilizing the contact between the protrusion of the rod and the auxiliary member, the initial abnormality of the rod can be detected reliably and accurately, and the pump can be stopped before damaging the components other than the diaphragm. It is supposed to be possible.

However, the method using the auxiliary member is simple in principle, but the type shown in FIG. 5 is difficult to adjust the pushing amount when setting the auxiliary member (30), and the pushing force is biased. Terminal (31)
The contact part of the device is deformed, and the spring of the type shown in FIG. 6 has to be provided with a spring (32) in a narrow recess, leaving various problems in structure and mounting operation. .

Also, since the electric circuit is opened due to the damage of the auxiliary member itself, and the operation of the pump is stopped, once the protective device is activated, the device will no longer need to replace the new auxiliary member. Since it is necessary, a spare auxiliary member is always required.

SUMMARY OF THE INVENTION The present invention has been made in view of an oblique situation, and an object of the present invention is to provide a protection device which is further improved from the conventional protection device, has a simple structure and is easy to install, and can be reset.

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

And the protection device of the present invention comprises: a first terminal having at least one convex curved portion; and a second terminal having one end of the first terminal and an end capable of forming an electrical contact, A case 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, And a slider having a protrusion formed on the upper edge of the rod, the protrusion having a length capable of abutting, and the slider being slidably accommodated, having an upper opening and a lower opening, and having a lower surface of the case. 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 to close the contact. If an error occurs, the lock It slid the slider of the pawl comes into contact with the projecting portion of the slider projecting from the lower opening, the first
It is characterized in that the tip of the terminal is moved into a second recess formed before and after the first recess to open the contact.

[Operation] The protective device of the present invention utilizes the elastic force of the terminal itself to open the contact. That is, during normal operation, the first terminal having at least one convex curved portion is disposed because the tip of the convex curved portion is arranged in the first concave portion provided on the slider. Positively 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 abuts on the protrusion of the slider and slides it. 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. In this case, since the first terminal was brought into contact with the second contact against the elastic force thereof, the contact was opened by returning to the original shape by moving into the second recess. It becomes a state.

[Embodiment] Hereinafter, a protection device of the present invention will be described in detail with reference to the accompanying drawings.

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

In FIGS. 1a and 1b, (A) is an embodiment of the protective device of the present invention, and the protective device (A) includes a first terminal (1), a second terminal (2), a case ( 3), a slider (4) and a holder (5). Less than,
Each component will be described in order.

The first terminal (1) and the second terminal (2) form a part of the electric circuit of the pump, and are highly elastic and electrically conductive, such as spring beryllium and spring phosphor bronze. It is made of a material with low resistance. First terminal (1)
Has convex curved portions (6) and (7). Of these, the convex curved portion (7) is a portion that applies an elastic force to the first terminal, and the shape shown in the figure does not necessarily have to be adopted as long as the elastic force can be applied. On the other hand, the convex curved portion (6) is a portion that engages with the first recess (8) formed in the slider (4) described later.

A contact point is formed by one end portion (9) of the first terminal (1) and one end portion (10) of the second terminal (2). The other ends of both terminals (1) and (2) are drawn out of the case (3).

The case (3) is a portion that houses the first terminal (1) and the second terminal (2), and is made of a synthetic resin such as ABS or PBT.

One surface of the case (3) (the lower surface in FIG. 1a) is open, and the upper opening (11) is on the open surface side.
The holder (5) having the lower opening (12) is fixed thereto by an appropriate means such as adhesion. Holder (5)
Is made of synthetic resin such as ABS and PBT. The holder (5) has a substantially tubular shape so as to accommodate the slider (4).

Inside the holder (5), a slider (4) made of synthetic resin such as 6,6-nylon, polyethylene or polyacetal is slidably arranged. A first recess (8) corresponding to the shape of the tip (13) of the convex curved portion (6) of the first terminal (1) is provided on the side of the slider (4) on the case (3) side. Is formed, and the tip (13) is housed in the first recess (8) during normal operation.

The slider (4) is movable in the same direction as the rod. The slider (4) has a protrusion (16) having a length capable of contacting the pawl (15) formed on the rod upper edge portion (14) at substantially the center of the side portion on the rod (20) side. The projecting portion (16) projects downward (toward the rod) through the lower opening (12).

The rod (20) claws (15) are separated by the rod (20)
During normal operation, the pawl (15) does not contact the protrusion (16) of the slider (4) and the pawl (15) protrudes when the diaphragm is damaged and the vibration center of the rod moves. It may be appropriately selected in consideration of the amplitude of the rod (20) so as to move the slider (4) by contacting the portion (16).

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

FIG. 1a shows the state of the protective device during normal operation. In this state, the tip (13) of the first terminal (1) is the first recess (8) formed in the slider (4). It is housed inside and the contacts are closed and energized. In this case, since the tip (13) is in the recess (8), a malfunction that opens the contact does not occur due to the microvibration accompanying the reciprocating motion of the rod.

When the diaphragm is damaged and the center of vibration of the rod (20) is offset, the pawl (15) of the rod (20) contacts the protrusion (16) of the slider (4) and the protrusion (16).
Press to move the slider (4). When the slider (4) moves, the tip (13) of the first terminal (1) is disengaged from the first recess (8) formed in the slider (4), and the first recess (8). To the inside of the second recess (17) formed before and after (the front and rear in the moving direction of the slider). In this case, the first terminal (1) was pushed upward so as to form a contact against its elastic force, and the second recess (17) was replaced by the first recess (8). ), The tip (13) moves downward, the contacts open, and the electric circuit is turned off. Thus, the pump operation is stopped as soon as the diaphragm is damaged.

Next, another embodiment of the protection device of the present invention will be described.

In the protective device (B) shown in FIGS. 2a and 2b, the number of protrusions (16) of the slider (4) is two, and the number of pawls (15) formed on the rod (20) is two. The structure is the same as that of the embodiment shown in FIGS. 1a and 1b, except that it is 1. When adopted with such a configuration, there is an advantage that the structure of the rod (20) becomes simple and it is possible to cope with different amplitudes only by changing the width of the barb.

As shown in FIG. 2a, if an elastic material such as rubber is attached to the side surface of the protrusion (16) of the slider (4) by using an adhesive or the like, contact vibration can be alleviated and the diaphragm It has the effect of accumulating force on the verge of breakage.

As shown in FIG. 3, the protection device of the present invention can be attached to a part of the pump main body, for example, an electromagnetic coil, by using screws. The fixing means and the fixing place are not particularly limited in the present invention, but as shown in FIG. 3, it is preferable to attach the electromagnetic coil as a cantilever from one side.

Although the above description is based on a specific embodiment, the protection device of the present invention is not limited to this embodiment, and various modifications can be considered without departing from the scope 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 sine curve shape shown in the figure. Further, the case, the slider protrusion, and the like may have an appropriate shape.

[Effects of the Invention] As described above, since the protective device of the present invention has a simple structure, it has the effects of facilitating installation and maintenance, and reliably operating to prevent breakdown of the pump body. . Further, since it can be reset, it can be repeatedly used, which is extremely economical.

[Brief description of drawings]

FIG. 1a is a cross-sectional explanatory view of one embodiment of the protective device of the present invention during normal operation, FIG. 1b is a cross-sectional explanatory diagram of the protective device shown in FIG. 1a during abnormal operation, and FIG. 2a is of the present invention. Sectional explanatory drawing at the time of normal operation of another example of the protection device,
FIG. 2b is a cross-sectional explanatory view of the protective device shown in FIG. 2a during abnormal operation, FIG. 3 is an explanatory diagram of a mounting state of the protective device of the present invention, and FIG. 4 is a plan view of a general diaphragm type air pump. 5 to 6 are schematic explanatory views of a conventional protection device. (Main symbols in the drawings) (A), (B): Protective device (1): First terminal (2): Second terminal (3): Case (4): Slider (5): Holder (6) : Convex curved part (8): First recess (17): Second recess

Claims (6)

[Claims] 1. A protection device for an air pump, which drives a diaphragm connected to the rod by electromagnetic vibration of a rod provided with the permanent magnet, which is based on a magnetic interaction between an electromagnet and a permanent magnet. A first terminal having one convex curved portion, a second terminal having an end capable of forming an electrical contact with one end of the first terminal, and accommodating the first and second terminals And a first terminal corresponding to the tip shape of the convex curved portion of the first terminal.
A slider having a concave portion, movable in the same direction as the rod, and having a protrusion at a substantially central portion, the protrusion having a length capable of contacting two pawls formed on an upper edge portion of the rod; Slidably housed therein, having an upper opening portion and a lower opening portion, and consisting of a substantially cylindrical holder fixed to the lower surface of the case. The tip is housed in the first recess of the slider through the upper opening, and the contact is closed. When an abnormality occurs, the claw of the rod contacts the protruding portion of the slider protruding from the lower opening. Slide the slider to move the first
A device for protecting a diaphragm type air pump, characterized in that the tip of the terminal is moved into a second recess formed before and after the first recess to open the contact. 2. The protective device according to claim 1, wherein an elastic material is attached to a side surface of the protruding portion of the slider. 3. The protection device according to claim 2, wherein the elastic material is rubber. 4. A protection device for an air pump, which drives a diaphragm connected to the rod by electromagnetic vibration of a rod provided with the permanent magnet, which is based on a magnetic interaction between an electromagnet and a permanent magnet, and comprising: A first terminal having one convex curved portion, a second terminal having an end capable of forming an electrical contact with one end of the first terminal, and accommodating the first and second terminals And a first terminal corresponding to the tip shape of the convex curved portion of the first terminal.
Has a recess, is movable in the same direction as the rod, and has a protrusion having a length capable of contacting one pawl formed on the upper edge of the rod. A slider, and 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. 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 to close the contact, and the tab of the rod projects from the lower opening when an abnormality occurs. Contacting the protruding part of the slider and sliding the slider,
A device for protecting a diaphragm type air pump, characterized in that the tip of the terminal is moved into a second recess formed before and after the first recess to open the contact. 5. The protective device according to claim 4, wherein an elastic material is attached to a side surface of the protruding portion of the slider. 6. The protective device according to claim 4, wherein the elastic material is rubber.