JPH02221689A - Electromagnetically-driven reciprocating pump - Google Patents

Abstract

PURPOSE:To prevent generation of any spark at the time of switching on and off by constituting a switch to control the action of an electromagnet with a switching element such as a semiconductor element, etc., and controlling it with another auxiliary switch, in the pump in the title which is reciprocating a diaphragm by the drive of the electromagnet. CONSTITUTION:An auxiliary switch 30 for a micro electric current which is switched off by pushing up a bar 30A at the time when a shaft 6 rises and is switched on by pulling down the bar 30A at the time when the shaft 6 falls is provided. A transistor 28 is switched on and off by the on-off action of this auxiliary switch 30 to switch an electromagnetic coil 3 on and off. Then, when the electromagnetic coil 3 is on, a diaphragm 7 is deformed upward against a compression spring 14 through a plunger 5 and liquid is sucked into a pump chamber 18 from a suction port 20 through a suction valve 22. Additionally, when the electromagnetic coil 3 is off, the diaphragm 7 is pushed down by the compression spring 14 and the liquid in the pump chamber 18 is discharged from a discharge port 21 through a discharge valve 23.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetically driven reciprocating pump, and particularly to improvements in the switch section.

[Conventional technology]

FIG. 4 is a sectional view showing a conventional electromagnetically driven reciprocating pump disclosed in, for example, Japanese Utility Model Publication No. 58-193059.

In this figure, (1) is a cylindrical yoke, a plunger receiver (2) is fixed in the center of this yoke (1), and an electromagnetic coil (3) is wound around the outer circumference of the plunger receiver (2). equipped. (4) is a magnetically conductive plate, and tta coil (3)
The lower part of the yoke (1) is fitted and fixed to the inner peripheral part of the yoke (1). (6) is a shaft that is inserted into the center of the plunger receiver (2) so that it can rise and fall freely, and the plunger (5) is fixed in the middle part of this shaft (6) facing the lower part of the plunger receiver (2). and a central portion of a diaphragm (7) is fixed to the lower end of the shaft (6). (8)
is made of lace material and is provided at the lower end of the plunger receiver (2) facing the plunger (5). (9) is
A bearing metal αQ that supports the lower part of the shaft (6) is fixed to the central part of the retainer (9), which is arranged between the diaphragm (7) and the magnetically conductive plate (4), and also supports the shaft (6). (6) Bearing metal aυ that supports the upper part of
is the plunger holder (fixed since February). retainer (
The peripheral edge of the diaphragm (9) is fixed to the yoke (1), and the peripheral edge of the diaphragm (7) is clamped and fixed between the pump base (b) and the pump body (to). α is the spring receiver (
A compression spring is interposed between the retainer (9) and the retainer (9).

At the bottom of the pump body (toward) is a pump cover σ.
A first pump chamber α closed by a diaphragm (7) and a yh3 pump chamber 0 located on the side thereof are formed. A second pump chamber (G) whose volume increases and decreases by driving is formed. 1st pump room (17)
Is suction port 4, 3rd pump chamber Q old and discharge port? υ
Each is equipped with At the bottom of the second pump chamber (7), a suction valve 4 is disposed between it and the first pump chamber αη, and a discharge valve 4 is disposed between it and the third pump chamber 01.
) and discharge valve) are the respective compression springs (goods), and)
The valve is pressed and held in the closed state.

Furthermore, the portion of the shaft (6) that protrudes above the yoke (1) is connected to a switch (E), and the switch (E) is connected in series with the electromagnetic coil (3) as shown in Figure 5. . (5) is a protective cover that covers the switch (E).

Next, the operation of the above configuration will be explained.

First, both terminals in FIG. 5 are connected to a power source, and the electromagnetic coil (3) is excited via a switch (E). This results in
Yoke (1) - Plunger holder (2) - Plunger (5)
- A magnetic circuit of magnetic conductive plate (4) - yoke (1) is formed,
The plunger (5) is attracted to the lower end of the plunger receiver (2) and receives a cushioning effect from the cushion member (8). ) is deformed upward, the volume of the second pump chamber (to) increases and the pressure decreases.As a result,
The liquid to be pumped is transferred from the suction port (A) to the first pump chamber (
1? ), and further pushes up the suction valve holder against the compression spring (c), and is sucked into the second pump chamber (g).

Also, as the shaft (6) rises, its upper end pushes up the switch (to), which turns off the switch (e) and the above-mentioned magnetic circuit disappears. Therefore, the compression α
The diaphragm (7) is pushed down by the return action of Φ, the volume of the second pump chamber (G) decreases, and the pressure increases. In other words, the liquid in the second pump chamber (G) flows through the discharge valve (2).
Press down against the compression spring (E) to open the third pump chamber O1.
e and is discharged from the discharge port ■υ.

Note that when the shaft (6) descends, its upper end pulls down the switch (1), which turns on the switch (7), forming the above-mentioned magnetic circuit again and connecting the plunger (5).
is attracted to the plunger receiver (2), and the shaft (6) rises. Thereafter, this operation is repeated, and the plunger (5) and therefore the shaft (6) are reciprocated to continue the pumping action.

[Problem to be solved by the invention]

Conventional electromagnetically driven reciprocating pumps are constructed as described above, and because the switch (2) directly turns on and off the excitation current of the electromagnetic coil (3), which is a large current, the mechanism of the switch (E) Not only is it complicated and large, but there are also problems such as large sparks generated when the enclosure is closed, which can oxidize the components of the switch (e) and pose a risk of ignition in a gas atmosphere.

This invention was made to solve these problems, and it is possible to make the switch smaller and to reduce the generation of sparks when the switch is opened and closed.
The present invention aims to provide an m-driven reciprocating pump.

[Means to solve the problem]

The electromagnetically driven reciprocating pump according to the present invention turns on and off the current of the electromagnetic coil using a switch IA made of a semiconductor element, a single-force switching element, and controls the switching element's control current as an auxiliary for minute current. It is controlled by a switch, and the switching element and the auxiliary switch are arranged on the same substrate.

[Effect]

The electromagnetically driven reciprocating pump according to the present invention turns on and off the control current of the switching element with an auxiliary switch, and
The excitation current of the electromagnetic coil is turned on and off by turning the switching element on and off.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, a switching element made of a semiconductor element such as a transistor is connected in series with the electromagnetic coil (3) to control the on/off state of the electromagnetic coil, as shown in the circuit diagram in Fig. 2. The fence is a printed circuit board that supports the switching element, the mirror is an auxiliary switch for microcurrent, a well-known microswitch, etc. is used, and a bar (hook) for opening and closing the contacts is connected to the upper end of the shaft (6).

Also, as shown in Figure 2, it is connected to the base circuit of the transistor (C), and turns on and off the base current (1), thereby turning on and off the transistor (E), and the electromagnetic coil (3).
) is controlled on and off.

In addition, the auxiliary switch ■ together with the above switching element,
It is attached to the printed circuit board (2) and housed within the protective cover (b). The rest of the configuration is the same as the conventional one, so the explanation will be omitted.

Next, the operation of this embodiment will be explained.

The basic operation of the pump is the same as the conventional pump, and when the shaft (6) is raised, the bar (3QA) is pushed up to turn off the auxiliary switch ■, and when the shaft (6) is lowered, the bar (3QA) is turned off. (Pull down to turn on the auxiliary switch). Due to this repeated action, the volume of the second pump chamber (7) changes, so the liquid to be pumped moves from the suction boat (4) to the first pump chamber, and further pushes up the suction valve bone against the compression spring □. As a result, it is sucked into the second pump chamber (G), and by pushing down the discharge valve against the compression spring, it is discharged into the third pump chamber α and discharged from the discharge port Gυ. This pumping action continues.

Transistor (to) by turning on and off the auxiliary switch
Since the base current of the transistor (c) is turned on and off, the transistor (c) is also turned on and off, thereby controlling the on-off state of the electromagnetic coil (3). In this case, since the auxiliary switch (2) turns on and off two very small currents, that is, the base current of the transistor, the components such as contacts can be made small, and the external dimensions can also be made very small. Therefore, it can be placed on a printed circuit board (support) together with electronic components such as switching element ends.

FIG. 3 shows another embodiment of the invention, in which a fuel cut relay (6) is connected in series with an auxiliary switch (7). The fuel cut relay consists of a thyristor Uυ connected in series with an auxiliary switch (7), a zener diode (6) connected to the gate of this thyristor (6), and an engine (not shown) connected to this zener diode □□□. It consists of an input terminal (-) that gives a signal only when the circuit is activated, a resistor (4), and a parallel diode (7).

In this embodiment, the thyristor (6) is turned on only when the engine is running, and is off in other states, so it can only operate when the engine is running, which provides very high safety. It is something.

〔Effect of the invention〕

As described above, according to the present invention, the excitation current of the electromagnetic coil is turned on and off by a switching element such as a semiconductor element, the control current of the switching element is controlled by an auxiliary switch, and the auxiliary switch and the switching element are Since they are disposed on the same substrate, the auxiliary switch can be made smaller and the generation of sparks when the switch is opened and closed can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing an electromagnetically driven reciprocating pump according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing the electrical connections of the above embodiment, and FIG. 3 is another embodiment of the invention. FIG. 4 is a cross-sectional side view showing a conventional electromagnetically driven reciprocating pump, and FIG. 5 is a circuit diagram showing electrical connections of the conventional pump. In the figure, (to) is a switching element, (g) is a printed circuit board, (g) is an auxiliary switch, and (6) is a fuel cut relay. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Patent Attorney Masuo Oiwa '10 30: 1000's 4 countries

Claims (1)

[Claims] A plunger driven by an electromagnet, a switch that is turned on and off according to the movement of the plunger to control the operation of the electromagnet, and a diaphragm that is reciprocated by the plunger and performs a pumping action by repeating suction and compression operations. The switch is configured with a switching element such as a semiconductor element, and the plunger is provided with an auxiliary switch that turns on and off according to the movement of the plunger, and the auxiliary switch controls the switching element, and the switching element An electromagnetically driven reciprocating pump characterized by having an auxiliary switch and an auxiliary switch arranged on the same board.