JPS6337531A - Electromagnetic relay - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a multipolar electromagnetic relay equipped with a plurality of relay units.

(Prior Art) In general, wipers for automobiles, etc., are as shown in Fig. 7.
Two electromagnetic relays R, , R are provided in the control circuit, and they are driven separately, one for forward rotation and the other for reverse rotation,
The DC motor M or the solenoid S is operated alternately in the forward direction and in the reverse direction.

(Problem that the invention attempts to solve) However, the two electromagnetic relays R,,R.

are each independent items.

Moreover, each electromagnetic relay has two coil terminals 7.
1.72, two fixed terminals 73, 74 and one common terminal 75 are provided.

Therefore, in order to connect the electromagnetic relays R, 112 to a printed circuit board or the like to form a forward and reverse rotation circuit, it is necessary to form a unique wiring pattern corresponding to each circuit. The problem is that it becomes complicated and requires a lot of time and effort to design.

In addition, when installing two independent electromagnetic relays R, , R, it is necessary to ensure an insulating distance between each of them and other electrical equipment, so compared to installing an electromagnetic U electrical equipment that is twice the size, the This has the problem that it requires a lot of space and becomes an obstacle in constructing a high-density circuit.

Furthermore, when switching a large current using the electromagnetic relay, fixed contacts 83 and 8 are used to prevent arcing.
Due to the need to increase the contact gap with 1, the movable contact 85
Moreover, there are problems in that the operating stroke of the movable member having the same increases, and that the electromagnetic device and electromagnetic relay for operating the movable member become larger.

(Means for solving the problems) The present invention has been made to solve the problems mentioned above.
A multi-pole electromagnetic relay includes a normally closed fixed terminal having two normally closed contacts, a normally open fixed terminal having two normally closed contacts opposite to the normally closed contacts, and the normally closed, normally closed contacts. two sets of common terminals each having a pair of common contacts disposed parallel to each other in opposing directions, and two movable contacts, one of which is normally closed as opposed to the other.

Two sets of movable contact pieces are arranged between the normally open contacts and the other between the opposing common contacts, and based on the excitation and demagnetization of the electromagnet, the two sets of movable contact pieces are independently set as normally closed and normally closed contacts. If it operates in the opposite direction, it is normally closed.

It consists of two sets of electromagnetic devices that open and close a circuit connecting either one of the normally open terminals and a common terminal.

(Example) Hereinafter, the present invention will be explained based on the accompanying drawings.

FIG. 1 is a diagram showing a schematic configuration of an electromagnetic appliance according to the present invention, and the electromagnetic appliance A generally includes a contact mechanism 2 on a base l, and two sets of electromagnet devices 3 a and 3 b. is installed, which allows two sets of relay units Ra,
Rh is configured.

In the contact mechanism 2, 21 is a normally closed fixed terminal, and 23 is a normally open fixed terminal, both of which are formed in a T-shape as shown in Fig. 2, and the upper horizontal part has two normally closed fixed terminals. Contact 22
a, 22b, and normally open fixed contacts 24a, 24b are respectively attached at the same interval.

These terminals 21 and 23 are connected to the contacts 22a and 2.
4a, 22b and 24b are placed on the base l facing each other.
It is fixedly installed.

25a, 25b are common terminals, and the common terminals 25a, 25
As shown in Fig. 2, the horizontal part of the temporary head formed in an inverted shape is bent into a U-shape, and the common terminal 25a connects the common contacts 2 (ia, 26a) to the common The terminal 25b has common contacts 26b, 26b on opposing surfaces, respectively.

The common terminals 25a and 25b are respectively terminals 21
．． 23, and the contacts 26a and 26a are the contacts 2
2a, parallel to 24a, and contact 26b.

26b is attached to the base l so as to be parallel to the contacts 22b and 24b.

27a and 27b are movable contact pieces. One movable contact piece 27a has two movable contacts 28a.

29a on both sides, movable contacts 28a, 29a, the opposing common contacts 26a, 26a and the fixed contact 22a.

24a. Similarly, the other movable contact piece 27b has two movable contacts 28b and 29b (T
I, common contacts 26b, 26b and fixed contact 22, respectively
b, 24b.

Furthermore, these movable contact pieces 27a and 27b are attached to the base l in a vertically movable state in FIG. 1, and are always urged downward in FIG. 1, and the movable contacts 28a and 29a are respectively ] (The connecting point 26a and the fixed contact 22a are in contact, and the movable parts a28b and 29b are in contact with the common contact 26b and the fixed contact 22b, respectively.

The electromagnet devices 3 a and 3 b each have an L-shaped yoke 35 fixed to an electromagnet 31 in which a coil 34 is wound around an iron core 32 via a spool 33 , and an abbreviated movable iron piece with a protrusion 37 fitted thereto. 36 is mounted so as to be rotatable in the directions of arrows a and a'' using the tip of the yoke 35 as a fulcrum (as it is raised, it can be independently driven by applying a current to the coil 34).

That is, when the 71X magnet 31 on the left side in FIG. Possible MJ contact 28a of contact piece 27a,
29a are pressed against the upper contacts 26a and 24a, respectively, and when the right electromagnet 31 in FIG. 1 is excited,
The movable contacts 28b, 29b of the movable contact piece 27b are pressed against the upper contacts 26b, 24b.

In this way, in the electromagnetic relay A, by operating the electromagnet device 3a, the relay unit Ra and the electromagnet are connected to each other, which conducts the normally closed fixed terminal 21 or the normally open fixed terminal 23 and the common terminal 25a via the movable contact piece 27a. By operating the device 3b, a relay unit nb is configured which connects the normally closed fixed terminal 21 or the normally open fixed terminal 23 and the common terminal 25b to each other via the movable contact piece 27b.

Note that the distance between the normally closed fixed terminal 21 and the normally open fixed terminal 23 and the common terminals 25a and 25b is adjusted as appropriate depending on the magnitude of the current to be opened and closed.

That is, when switching a large current, the common terminals 25a and 25b in FIG.
a, the distance between 24a and contact 26a, and contact 22b, 2
4b and the contact point 26b is increased.

Note that at this time, the opposing contacts 22a and 24a.

The spacing between the contacts 22b, 24b, the contacts 26a, 2Ga, and the contacts 26b, 26b may remain as they are.

The operation of the electromagnetic relay A having the above configuration will be explained below.

When the electromagnet devices 3a and 3b are not in operation, the normally closed fixed terminal 21 and the common terminals 25a and 25
b is conducting.

When the electromagnet device 3a is energized, the movable iron piece 36 is attracted to the iron core 32 and rotates in the direction of arrow a, and the protrusion 37 pushes the movable contact piece 27a upward in FIG. When C 28a comes into contact with the upper common contact 26a in FIG. It goes through.

Similarly, when the electromagnet device 3b is excited, the movable contact piece 27
b moves, and the normally open fixed terminal 23 and the common terminal 25b are electrically connected via the movable contact piece 27b.

Conversely, when the electromagnet devices 3a and 3b are demagnetized, the movable iron piece 3
Due to its own weight, the movable iron piece 37 rotates in the force direction of arrow a°, and the movable contact piece 27a.

27b returns to the state shown in FIG.

Next, the case where the electromagnetic relay A is used to drive the DC motor in forward and reverse rotation will be explained with reference to the circuit diagrams shown in FIGS. 4 to 6.

In FIG. 4, the normally closed fixed terminal 21 is connected to the ◯ terminal of the DC power supply, and the normally open fixed terminal 23 is connected to the ◯ terminal of the DC power supply.

Further, the common terminals 25a and 25b are connected to the motor 100, respectively.
connected to both poles of

Furthermore, one end of the coil 34 of the electromagnet device 3a is connected to the e terminal via the circuit to which the normally closed fixed terminal 21 is connected, and the other end is connected to the ■ terminal via the switch SWl.

On the other hand, one end of the coil 34 of the electromagnet device 3b is connected to the e terminal via the circuit to which the normally closed fixed terminal 21 is connected, and the other end is connected to the ■ terminal via the switch SWt.

Therefore, when the switch SW1 is turned on while the switch SWt is turned off, the electromagnet device 3a is excited and the fifth
Configure the circuit shown in the figure.

As a result, the movable contact 28a of the movable contact piece 27a.

29a contacts the common contact 26a and the fixed contact 24a, respectively, thereby establishing electrical continuity between the normally open fixed terminal 23 and the common terminal 25a.

Then, the ■terminal of the DC power supply is connected to the motor 10 via the normally open fixed terminal 23, the movable contact piece 27a, and the connecting terminal 25a.
Conducted to one end of 0.

On the other hand, the terminal e of the DC power source is electrically connected to the other end of the motor 100 via the normally closed fixed terminal 21, the movable contact piece 27b, and the common terminal 25b.

Therefore, a current flows in the direction of arrow (P) in the motor 100, and the motor 100 is driven to rotate in the normal direction.

Contrary to the above-mentioned operation, when switch SW is turned on while switch SWl is turned off, only the electromagnet device 3b operates and the movable contact piece 27b moves to the 1F direction shown in FIG. Construct the circuit shown in Figure 6.

As a result, the movable contact 28b of the movable contact piece 27b.

29b are connected to the common contact 26b and the fixed contact 24b, respectively, and conduct the normally open fixed terminal 23 and the common terminal 25b.

Then, the ■ terminal of the DC power supply is connected to the motor 10 via the normally open fixed terminal 23, the movable contact piece 27b, and the common terminal 25b.
Conducts to one end of 0.

On the other hand, the θ terminal of the DC power source is electrically connected to the other end of the motor lOO via the normally closed fixed terminal 21, the movable contact piece 27a, and the common terminal 25a.

Therefore, a current flows in the direction of the arrow (P') in the motor 100, and the motor 100 is driven in the reverse direction.

In the above embodiment, the movable contact pieces 27a and 27b were provided separately from the electromagnet devices 3a and 3b, and were operated by the movable iron piece 36 and the protrusion 37, but the present invention is not limited to this. As shown in FIG. 3, movable contact pieces 27a, 27b
are integrally attached to the movable iron piece 36, and the movable contact piece 27 is attached based on the excitation and demagnetization of the electromagnetic devices 3a and 3b.
a, 27b may be made to operate integrally with the movable iron piece 36.

Further, in the above embodiment, the common terminals 25a, 25b are the normally closed fixed terminals 21. Although the normally open fixed terminals 23 are provided on both sides, their arrangement is not limited to the above embodiment.

(Effect of the invention) As is clear from the above explanation, the electromagnetic U according to the present invention
The electrical appliance has two normally-closed fixed terminals and two normally-open fixed terminals attached to opposing normally-closed and normally-open fixed terminals, respectively, and a pair of normally-closed and normally-opened fixed terminals arranged in opposite directions. In addition to providing two sets of common terminals with a common contact point a, the above-mentioned normally closed terminal is provided.

Two movable contact pieces having a first movable contact located between the normally open fixed terminals and a second movable contact located between the common contacts are provided so as to be movable back and forth between the opposing contacts, and an electromagnet is provided. The device independently controls the on and off of two sets of relay units.

Therefore, in the conventional relay unit, each relay unit must be provided with a normally closed fixed terminal and a normally open fixed terminal, whereas according to the electromagnetic relay according to the present invention, one set of normally closed fixed terminals and one set of normally open fixed terminals are required. Fixed terminals can be shared,
Accordingly, the cost of the electromagnetic relay can be reduced.

Further, since the electromagnetic relay can configure a part of the forward/reverse rotation circuit internally, pattern design of the printed circuit board can be omitted, improving design efficiency and simplifying wiring work.

Furthermore, compared to installing two independent relay units in parallel, less space is required to ensure insulation distance from other electrical equipment, improving space efficiency.
A higher density circuit configuration becomes possible.

Furthermore, in order to switch on and off a large current using the relay unit of an electromagnetic relay, even if the contact gap between the normally closed and normally open contacts and the common contact is increased, the operating stroke of the movable contact piece remains the same. The electromagnetic relay can be made smaller and more compact without increasing the size of the electromagnet device.

[Brief explanation of the drawing]

Figure 1 is a plan view showing a schematic configuration of an electromagnetic relay, Figure 2 is a perspective view of a fixed terminal, Figure 3 is a side view showing other embodiments, and Figures 4 to 6 are usage examples of the electromagnetic relay. FIG. 7 is a circuit diagram showing an example of the use of a conventional electromagnetic relay. A... Electromagnetic relay, Ra, Rb... Relay unit, l... Base, 2... Contact mechanism, 3 a, 3 b... Electromagnet device, 3 a, 3 b
...Electromagnetic relay, 21...Normally closed fixed terminal, 22a, 2
2b...Normally closed contact, 23...Normally open fixed terminal, 24a
, 24b... Normally open contact, 25a, 25b... Common terminal, 26a, 26b... Common contact, 27a, 27b.
...Movable contact pieces 28a, 29a, 28b, 29b, movable contact, 31...
·electromagnet.

Claims (1)

[Claims] (1) A normally closed fixed terminal having two normally closed contacts, a normally open fixed terminal having two normally open contacts facing the normally closed contacts, and parallel to the opposite direction of the normally closed and normally open contacts. It has two sets of common terminals each having a pair of common contacts arranged opposite to each other, and two movable contacts, one between the opposing normally closed and normally open contacts, and the other between the opposing common contacts. Based on the two sets of movable contact pieces arranged respectively and the excitation and demagnetization of the electromagnets, the two sets of movable contact pieces are independently operated in the opposite directions of the normally closed and normally open contacts, and either the normally closed or normally open terminal is operated. An electromagnetic relay comprising two sets of electromagnetic devices that open and close a circuit connecting one of the two and a common terminal.