JP2530400Y2 - Abnormal operation detection mechanism in electromagnetic vibration type diaphragm air pump - Google Patents

Description

[Detailed description of the invention] (Industrial application field) In this invention, the drive rod reciprocates according to the power supply frequency by the interaction with the permanent magnet provided on the drive rod and the electromagnet arranged on the outer periphery of the permanent magnet. The present invention relates to an electromagnetic vibration type diaphragm air pump.

(Prior Art) FIG. 4 is a sectional view schematically showing an electromagnetic vibration type diaphragm type air pump.

Diaphragms 8L, 8R are attached to the mounting tables 7L, 7R provided on both sides of the casing 1 so as to face each other, and the suction holes 3LI, 3RI and the discharge holes 4LO, 4RO are mounted via the mounting tables 7L, 7R. Are formed, and the pump chambers RL and RR are formed by the diaphragms 8L and 8R and the cover casings 2L and 2R, respectively. 5L, 5R, 6L, and 6R are check valves that open and close the suction holes 3LI and 3RI and the discharge holes 4LO and 4RO, respectively.

The drive rod 9 is provided with a permanent magnet 10 and both ends thereof are connected and fixed to the diaphragms 8L and 8R.

The outer periphery of the permanent magnet 10 is arranged an electromagnet 11 _1, 11 _2, the electromagnet 11 _1, 11 ₂ and the core 11 _11, 11 _21, and a coil 11 _12, 11 _22.

In such an electromagnetic vibratory diaphragm air pump, the electromagnet 11 _1, 11 ₂ into AC of a predetermined frequency is supplied, the permanent magnet 10 and the electromagnet 11 _1, 11 driving rod 9 by ₂ interactions reciprocating right and left Move. Therefore, as shown by the arrows, the air flows in through the suction holes 3LI, 3RI, passes through the pump chambers RL, RR, and then flows out from the discharge holes 4LO, 4RO.

When the above-mentioned electromagnetic vibration type diaphragm type air pump is used for a long time, the diaphragm 8 supporting the driving rod 9 can be used.
When the L and 8R are damaged, the driving rod 9 and the permanent magnet 10 provided on the driving rod 9 come into contact with the electromagnets 11 ₁ and 11 ₂ ,
The electromagnets 11 ₁ and 11 ₂ may be damaged, or the permanent magnet 10 may be damaged and scattered.

Therefore, when the diaphragms 8L, 8R are damaged, the driving rod 9 and the permanent magnet 10 approach one of the diaphragms 8L, 8R and vibrate including the movement of the driving rod 9 in a direction other than the axial direction. When an abnormal displacement exceeding the permissible range of normal reciprocation is performed, a switch opened by the projection of the drive rod 9 is provided on the electromagnet 11 ₁ or 11 _2.
The switch when abnormal displacement open at the protrusion is stopped, the drive rod 9, the permanent magnet 10 and the electromagnet 11 _1, 11 ₂ is damaged, and prevent damage.

(Problems to be Solved by the Invention) In the conventional electromagnetic vibration type diaphragm air pump as described above, the displacement of the drive rod provided with the permanent magnet increases due to the phase of the current flowing through the electromagnet when the power is turned on. In some cases, the conventional configuration cannot distinguish between the overshoot based on the initial vibration and the abnormal displacement due to the damage of the diaphragm, and has a disadvantage that the displacement of the driving rod at the time of startup opens the switch. ing.

In addition, the abnormal displacement detecting means including the protrusion and the switch in the conventional configuration is of a type for detecting the displacement of the reciprocating motion, and the reciprocating motion includes various vibrations including the initial vibration when the power is turned on as described above. It varied depending on conditions (hardness of the diaphragm, tension, aging, differences in power supply frequencies of 50 Hz and 60 Hz, differences in voltage, variations in parts, etc.), making it difficult to set a reliable detection position.

The present invention focuses on the fact that abnormal displacement based on damage to the diaphragm appears in a direction perpendicular to the reciprocating motion of the driving rod rather than detecting reciprocating motion of the driving rod, and detects displacement in a direction perpendicular to the reciprocating motion of the driving rod. Accordingly, an object of the present invention is to provide an electromagnetic vibration type diaphragm type air pump which can solve the above-mentioned conventional drawbacks and can prevent breakage and damage of a drive rod, a permanent magnet, and an electromagnet caused by damage to a diaphragm. Things.

(Means for Solving the Problems) According to the present invention, in order to achieve the above object, each end of a drive rod having a permanent magnet is connected to a pair of diaphragms defining a pump chamber. In the electromagnetic vibration type diaphragm air pump in which an electromagnet is disposed to face and the driving rod reciprocates according to the power supply frequency by the interaction between the electromagnet and the permanent magnet, the driving rod is displaced toward the electromagnet. The drive rod is provided with a contact piece for detecting the contact, and a normally open contact closed by the contact piece is provided on both sides of a path of the drive rod formed between the pair of electromagnets. The other of the contacts is connected to a connection circuit between the coil and a fuse for shutting off the power supply, and the closing of the contacts causes the coil to be short-circuited to blow the fuse and to be connected to the electromagnet. It is special to shut off the power supply. Sign.

(Operation) According to the configuration of the present invention, when the diaphragm is damaged during operation of the electromagnetic vibration type diaphragm type air pump, the contact piece provided on the drive rod becomes one of the electromagnets with the displacement in the direction orthogonal to the reciprocation of the drive rod. And closes the contact provided in the winding of the electromagnet, short-circuits the coil of the electromagnet, blows the fuse in the abnormal operation detection circuit, cuts off the power supply, and stops the operation of the air pump.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Figure 1 shows a magnet 11 _1, 11 ₂ of the abnormal operation detecting circuit of the present invention in the electromagnetic vibrational diaphragm air pump.

At both ends of the electromagnet 11 _1, 11 ₂ of the coil 11 _12, 11 ₂₂ it is connected to a power supply terminal 21 _1, 21 ₂ via the fuse 14,
Taps 15 ₁ and 15 ₂ are provided in the middle of the coil, and coils 11 ₁₂ and 11 ₂₂
The normally open contacts 12 ₁ and 12 ₂ are formed in parallel with a part of
It is connected to a connection circuit 16 between ₁₂ , ₁₁₂₂ and the phase 14.

When the contact piece 13 provided on the drive rod 9 contacts _one of the normally open contacts 12 ₁ and 12 ₂ , for example, the normally open contact 121, the power supply terminal 21 ₁ , the phase 14,
The circuit consisting of the contact 12 ₁ , the coil 11 ₁₂ and the terminal 21 ₂ is short-circuited,
As a result, phase 14 is melted and the power supply is cut off.

A contact piece 13 provided on the drive rod 9, the electromagnet 11 _1, 11 normally open contacts 12 ₁ provided on the ₂ side, 12 ₂ and the associated second view of a third
It is shown in the figure.

2 and 3, for ease of understanding, pump chambers such as diaphragms provided at both ends of the driving rod 9 are removed.
It is shown in a top view and a front view.

The driving rod 9 is provided with a permanent magnet 10 on the surface facing the electromagnets 11 ₁ and 11 ₂ so that the driving rod 9 can reciprocate in the X direction within the passage of the two electromagnets 11 ₁ and 11 _2. Are the electromagnets 11 ₁ and 11
_A contact piece 13 shorter than the width of the passage between the contact pieces 2 is provided.

The electromagnets 11 ₁ , 11 ₂
Of the bobbin 11 _13, 11 ₂₃ are arranged, the bobbin 11 _13, 11
₂₃ includes coils 11 ₁₂ and 11 ₂₂ corresponding to the side surfaces of the contact piece 13.
And normally open contacts 12 ₁ and 12 ₂ provided in parallel with.

In such an embodiment of the present invention, the electromagnets 11 ₁ , 11 ₂
When a predetermined power supply frequency is supplied to the drive rod 9, the drive rod 9 provided with the permanent magnet 10 is reciprocated in the X direction to suck and discharge air.

If any of the diaphragms 8L and 8R is damaged during the operation of the air pump, the drive rod 9 is biased to the center of the left and right reciprocating movement in the X direction toward the damaged diaphragm and is perpendicular to the reciprocating movement. Direction, ie, the electromagnet 11
_1, 11 is accompanied a biased state to either the _second to become a to reciprocate, the offset into either of the electromagnets 11 _1, 11 ₂ of the drive rod 9, the driving rod 9, the permanent magnet 10 Immediately before connecting to the electromagnets 11 ₁ and 11 ₂ , the end face of the contact piece 13
1 _13, 11 ₂₃ normally open contacts 12 ₁ provided on, 12 _second contact with either one.

For this reason, the abnormal operation detection circuit uses one of the normally open contacts 12 ₁ , 12 _1
2 is closed by the coil 11 _12, 11 ₂₂ are short-circuited, and blow the fuse 14 to interrupt the power supplied to the electromagnet 11 _1, 11 _2.

Detecting a state in which the driving rod 9 is biased to the electromagnet 11 _1, 11 _2, by contact with the contact piece 13 and the bobbin 11 _13, 11 normally open contacts 12 ₁ provided on the surface of _23, 12 ₂ provided on the driving rod 9 order to be able to drive rod 9, the contact between the permanent magnet 10 and the electromagnetic 11 _1, 11 ₂ can be prevented.

In addition, since the abnormal operation detection circuit uses the coil of the electromagnet corresponding to the driving unit of the air pump, it can be configured at low cost without using any other dedicated means.

(Effects) In the configuration of the present invention, utilizing the coil of the electromagnet provided as the drive unit of the air pump, and paying attention to the reciprocating movement of the drive rod due to the breakage of the diaphragm, the displacement of the contact piece provided on the drive rod, Since the power supplied to the coil of the electromagnet can be cut off, it is possible to prevent the drive rod, the permanent magnet, and the electromagnet from being damaged or damaged without adding extraordinary abnormal operation detecting means.

[Brief description of the drawings]

FIG. 1 is an abnormal operation detection circuit using an electromagnet coil according to an embodiment of the present invention. FIGS. 2 and 3 are a plan view and a front view showing an embodiment of the abnormal operation detection mechanism of the present invention. 1 is a schematic sectional view of an electromagnetic vibration type diaphragm type air pump. RL, RR pump chamber, 8L, 8R diaphragm, 9 drive rod, 11 ₁ , 11 ₂ electromagnet, 12 ₁ , 12 ₂ contact, 13 contact piece.

Claims (1)

(57) [Scope of request for utility model registration] An end of a driving rod having a permanent magnet is connected to a pair of diaphragms defining a pump chamber, and an electromagnet is disposed on both sides of the permanent magnet so as to face the electromagnet and the permanent magnet. An electromagnetic vibration type diaphragm air pump that reciprocates the driving rod according to the power supply frequency by interaction with the contact rod, a contact piece for detecting displacement of the driving rod toward the electromagnet is provided on the driving rod, and a pair of the electromagnets A normally open contact closed by the contact piece is provided on both sides of the drive rod passage formed between the contact rods, one of the contacts is connected to an intermediate portion of the coil of each electromagnet, and the other of the contacts is connected to the coil. Characterized in that the coil is short-circuited by closing the contact, the fuse is blown, and the power supply to the electromagnet is cut off. Difference in Normal operation detection mechanism.