JPH039091A - Protection device for diaphragm type air pump - Google Patents

Abstract

PURPOSE:To simplify a protective device in a system for feeding air via the actuation of a diaphragm with the electromagnetic vibration of a rod by applying the constitution wherein a terminal support is rotated with the contact thereof with the lever of the claw of the rod upon the occurrence of an abnormality such as diaphragm damage, thereby opening a contact. CONSTITUTION:When an air pump is under normal operation, the the first end 3a of a terminal 3 in a protective device A is in contact with a connecting terminal 5 on the upper surface of the projection 6 of a terminal support 1 as shown in Fig. (a). Also, a contact is closed and an electric circuit is live. On the other hand, when the diaphragm of the air pump is broken and the center of the vibration of a rod 9 becomes eccentric (for example, eccentric as shown in Fig. b), the claw 10 of the rod 9 comes in contact with and presses a lever 2, thereby turning the terminal support 1. As a result, the first end 3a moves on the connecting terminal 5 and the electric circuit is turned off, thereby stopping the operation of the air pump immediately.

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 type air pump that has a simple structure, is easy to attach to the pump body, is easy to maintain, and can be reset so that 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, home purification, etc., or for sampling test gas in pollution monitoring. .

Such a diaphragm air pump, as shown in FIG. 21) is configured to reciprocate in its longitudinal direction depending on the power frequency. By the vibration of the diaphragm [241] connected to the rod, the volume of the pump chamber (5) increases and decreases in a contralateral manner, whereby air is sucked in and discharged alternately on the left and right sides.

In this type of pump, the strength of the movement of the vibration system including the rod (21) is the most important factor in determining the quality of performance. The movement of the vibration system is strongest in the resonance region tuned to the natural frequency of the vibration system or the drive power frequency, and in order to obtain such strong movement of the vibration system, the diaphragm (24) is It has been given a commensurate amount of repulsion.

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 vibrating while 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 driving the pump in the event that 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. 7 and 8, 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 is moving 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 (toward the broken diaphragm).

According to the method that utilizes the contact between the protrusion of the rod and the auxiliary member, it is possible to reliably and accurately detect the initial abnormality of the rod, and it is possible to stop the pump before it causes damage to components other than the diaphragm. It is considered possible.

However, although the principle of the method using the auxiliary member is simple, the type shown in FIG. If the force or bias is applied, the terminal (3
1) is deformed, and the type shown in Figure 8 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 electric circuit will open and the pump will either stop operating or stop. 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, to provide a protection device that is simple in structure and installation, and can be reset.

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

In the protection device of the present invention, the terminal holder is a member having a substantially cylindrical shape with a protruding strip in the axial direction and a connecting terminal provided on the upper surface of the protruding strip, or a polygonal columnar shape having a connecting terminal provided on one side. the terminal holder is formed on the extending shaft of the member, and a lever has a length that abuts two pawls formed on the upper edge of the rod; The receiving bearing has a part,
The terminal holder includes a casing that accommodates a member, and a pair of terminals, the first end of which is pressed against the side surface of the member and the second end fixed to the casing, and the terminal holder includes a pair of terminals having a first end pressed against a side surface of the member and a second end fixed to the casing. During operation, the first end of the pair of terminals or the terminal holder is pressed onto the connecting terminal of the member to close the contact, and when an abnormality occurs, the claw of the rod comes into contact with the lever. the terminal holder rotates the member to release contact between the first end of the terminal and the connecting terminal;
It is characterized in that it is configured to open the contact.

[Function] The protection device of the present invention utilizes the elastic force of the terminal itself to release the contact. That is, during normal operation, the first end (not necessarily the tip, but one side of the long thin plate terminal) of the pair of terminals fixed to the casing is inside the casing. The terminal holder accommodated in the member is located on the side of the member (if the member is cylindrical, the terminal holder is a convex strip formed in the axial direction; if the member is polygonal, it means one side). The contact terminal is pressed against the elastic force of the terminal itself. However, if the diaphragm is damaged and the vibration center of the rod moves, the pawl formed on the upper edge of the rod will
The terminal holder contacts a lever formed on the extension axis of the member, and the terminal holder rotates the member.

As a result, the contact between the first end of the terminal and the communication terminal is released, the contact becomes open, and the operation of the pump is stopped.

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

Fig. 1 is a schematic perspective view of the protection device of the present invention, Fig. 2a is a cross-sectional explanatory view of the protection device shown in Fig. 1 during normal operation, and Figs. 2b and 2C are the protection device shown in Fig. 1. FIG. 3 is a cross-sectional explanatory diagram when the device is operating abnormally.

In FIG. 1, (8) is an embodiment of the protection device of the present invention, and the protection device (A) includes a terminal holder including a member (1), a lever (2), a terminal (3), and a connecting terminal ( 4) and a 0 casing (5). Each component will be explained in order below.

In the terminal holder, the member (1) is a member that comes into contact with the first end (3a) of the terminal (3), which will be described later.As shown in Figs. As shown in Figure 3, some have polygonal cross sections. Although FIG. 3 shows a hexagonal cross section, it may be pentagonal or octagonal, and this shape is not particularly limited in the present invention.

In the case of the terminal holder having a substantially circular cross section, a protrusion (6) is formed along the axial direction in the case of the member (1). A connecting terminal (5) for electrically connecting the pair of terminals (3) is provided on the upper surface of the protruding strip (6). The contact terminal (5) can be fixed to the protrusion (6) using adhesive, for example. The terminal receiver (7) is a collar formed at both ends of the member (1).

The shaft of a member (1) of the terminal receiver extends in one direction, and a plate-shaped lever (2) is formed on this extended shaft (8). The lever (2) has a length that allows it to come into contact with two pawls 00 formed on the upper edge of the rod (9) (see Figure 2a). The terminal holder of the lever (2) may be formed integrally with the member (1), or it may be manufactured separately and the terminal holder may be formed integrally with the member (1).
) may be fixed to the shaft (8).

The terminal holder (4) is a box-shaped casing with an open top surface that houses the member (1). The top surface is covered with another member and only the second end (3b) of the terminal (3) is covered with a casing (4).
It may also be pulled out. On the two opposing sides of the Kenng (4), there is a bearing part 01) consisting of a wide slit.
is formed. The lower end of the bearing (member) is cut out in a semicircular shape, and the terminal holder is attached to this semicircular portion (member).
1) The shafts at both ends are supported. Bearing part 01) is
It may be a circular opening having an inner diameter slightly larger than the outer diameter of the shaft (8). The terminal holder is attached to the part (7) on the member (1).
), the terminal holder member (1) rotates smoothly.

(3) is a terminal that constitutes a part of the electric circuit of the pump. The terminal (3) is fixed to the casing cap 4) such that the first end (3a) is in contact with the side surface of the member (1), and the second end (3b) is fixed to the casing cap 4). has been done.

That is, the elastic force of the terminal (3) is utilized, and the terminal (3) is pushed upward in FIG. The terminal holder is
) The terminal (3) is arranged so as to be in contact with the side surface of the terminal (3).

The terminal (3) and the connecting terminal (5) are made of a material that is highly elastic, has good conductivity, and has low electrical resistance, such as beryme for springs and phosphor bronze for springs.

The tip of the first end (3a) of the terminal (3) is connected to the convex strip (6) of the member (1) when the terminal holder is reset when the protective device is reset.
is bent in the opposite direction to prevent it from getting caught (second
(See figure a).

The terminal holder consists of member (1), lever (2), and casing (4).
, the protrusions (6) and the collar can be made of heat-resistant ABS, polycarbonate, synthetic resin such as Pt3T, etc.

Next, other embodiments of the protection device of the present invention will be described. In the embodiment shown in FIG. 1, the terminals extend from the same direction, but in the embodiment shown in FIGS. 4a-40, the terminals extend from opposite directions.

In the embodiment shown in FIGS. 4a to 40, the downward elastic force of the terminal (3) is effectively used, and the protective device can be reliably activated during abnormal pump operation. effective. That is, in the state shown in FIG. 4b, the left terminal (3a) contacts the protrusion (6) of the terminal holder (1) and rotates the member (1) clockwise.

Therefore, the position of the lever (2) can be made higher than in the state shown in FIG. 2b, and the protection device can be operated more reliably. The position of the lever when the terminal holder is rotated counterclockwise by member (1) is the same in the embodiment shown in FIG. 1 and in the embodiments shown in FIGS. 4a to 40. 2c and 4C).

Next, the operation of the protection device of the present invention will be explained with reference to FIGS. 2a to 20.

FIG. 2a shows the state of the terminal 3 4 member (1) and terminal (3) of the protective device during normal operation. In this state, the first end (3a) of the terminal (3) is connected to the connecting terminal (
5), and the contact is closed and energized.

In this case, since the contact terminal (5) is not a linear member but a planar member having a certain width (approximately 2 to 3 IIIll), the first end (3a) and the contact terminal (5) is conducting face-to-face contact. Therefore, malfunctions such as opening of the contacts due to minute vibrations caused by the reciprocating movement of the rod do not occur.

If the diaphragm is damaged and the center of vibration of the rod (9) is shifted, the pawl of the rod (9) comes into contact with the lever (2) and pushes the lever (2), causing the terminal bone to move away from the member ( 1) Rotate. FIG. 2b shows the state rotated clockwise, and FIG. 2C shows the state rotated counterclockwise. When the first end (3a) is moved off the contact terminal (5), the contacts open and the electrical circuit is turned off (ofT). Thus, as soon as the diaphragm breaks, the pump is shut down.

The embodiment shown in FIGS. 4a to 40 also uses a similar operation to stop the operation of the pump in the event of an abnormality.

As shown in FIG. 5, the protective device of the present invention can be attached to a part of the pump body, for example, on the electromagnetic coil, using a bolt 6 and a nut G, but the securing means is The fixed location is not particularly limited in the present invention. Note that in the protection device shown in FIG. 5, the direction of the terminals is opposite to that shown in FIG. 1. In this way, the direction of the terminal can be selected as appropriate.

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 cross-sectional shape of the protrusion may be trapezoidal,
Further, appropriate shapes of the casing and lever can be adopted.

[Effects of the Invention] As explained above, the protection device of the present invention has a simple structure, so it is easy to install and maintain, and also works reliably to prevent failure of the pump body. effective.

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

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of one embodiment of the protection device of the present invention, Fig. 2a is a sectional explanatory view of the protection device shown in Fig. 1 during normal operation, and Figs. 2b and 2c are Fig. 2a. A cross-sectional explanatory diagram of the protective device shown in Fig. 3 during abnormal operation.
Figure 4a is a cross-sectional explanatory view of another example of the terminal bone member of the protective device of the present invention, Figure 4a is a cross-sectional explanatory view of another example of the protective device of the present invention during normal operation, Figures 4b and 4c The figure is a cross-sectional explanatory diagram of the protective device shown in Figure 4a during abnormal operation, Figure 5 is an explanatory diagram of the installed state of the protective device of the present invention, and Figure 6 is a plan view of a general diaphragm type air pump. 7 and 8 are schematic illustrations of conventional protection devices. (Main symbols in the drawing) (A): Protective device (1); Terminal bone is member (2): Lever (3): Terminal (4): Casing (5) Two connecting terminals (6): Convex strip 7 8 Fang 28 Diagram 1 Fig. 5: Connection terminal Fang 2b diagram F/-7 Fang 2C diagram Fang 4C diagram Fang 5

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 equipped with the permanent magnet, the air pump having a protrusion in the axial direction and a connecting terminal provided on the upper surface of the protrusion. a substantially cylindrical terminal receiving member; a lever formed on the extension axis of the terminal receiving member and having a length capable of coming into contact with two pawls formed on the upper edge of the rod; and the terminal receiving member. It has a bearing part that receives the shaft at both ends of the member,
It consists of a casing that accommodates the terminal receiving member, and a pair of terminals having a first end pressed against a side surface of the terminal receiving member and a second end fixed to the casing, during normal operation of the pump. In this case, the first ends of the pair of terminals are pressed onto the connecting terminals of the terminal receiving member to close the contacts, and when an abnormality occurs, the claw of the rod comes into contact with the lever and closes the terminals. rotating the receiving member to release the contact between the first end of the terminal and the communication terminal;
A protection device for a diaphragm air pump, characterized in that the device is configured to open the contact. 2 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 terminal receiving member having a polygonal column shape and having a connecting terminal on one side; a lever formed on an extended shaft of the receiving member and having a length capable of coming into contact with two pawls formed on the upper edge of the rod; and a bearing portion receiving the shafts at both ends of the terminal receiving member;
It consists of a casing that accommodates the terminal receiving member, and a pair of terminals having a first end pressed against a side surface of the terminal receiving member and a second end fixed to the casing, during normal operation of the pump. In this case, the first ends of the pair of terminals are pressed onto the connecting terminals of the terminal receiving member to close the contacts, and when an abnormality occurs, the claw of the rod comes into contact with the lever and closes the terminals. rotating the receiving member to release the contact between the first end of the terminal and the communication terminal;
A protection device for a diaphragm air pump, characterized in that the device is configured to open the contact.