CN1996533B - A Magnetic Latching Relay with Overcurrent Protection - Google Patents

Abstract

This invention discloses one magnetic keep relay with overflow protection, which comprises base socket and electromagnetic coil on socket, wherein, the base socket two ends are set with yoke iron; two irons are set with drive arm bus between; one side of base socket is set the drive arm bus trigger slice. The invention is characterized by the following: the said electromagnetic line loop is set with overflow protection coil with two ends connected to supply circuit and load, and trigger slices.

Description

A Magnetic Latching Relay with Overcurrent Protection

technical field

The invention relates to the field of magnetic latching relays, in particular to a magnetic latching relay with overcurrent protection.

Background technique

At present, the structure of the common magnetic latching relay generally includes a base, an electromagnetic coil and yokes arranged at both ends of the machine base, a rocker arm is arranged between the two yokes, and a moving reed and a static spring are arranged on one side of the machine base. The seesaw arm drives the reed to move through the middle connecting block. When the electromagnetic coil is fed with pulse currents in different directions, the magnetic force generated by it will make the swing arm swing, and the connecting block and the moving reed will swing left and right driven by the swing arm, thereby realizing the contact between the moving reed and the static spring. to achieve the closure or disconnection of the control circuit, and then the magnetic latching relay will memorize the current state to achieve the energy-saving effect of the relay. However, in the circuit where the magnetic latching relay is actually applied, in order to have the necessary safety protection for the circuit, an electronic detection device is generally used to achieve the purpose of overcurrent protection on the circuit, but when the circuit is short-circuited, the electronic detection device cannot be used. Due to the protection function, the relay and the power supply circuit will be burned quickly, causing a safety accident and reducing the safety and reliability of the load circuit.

Contents of the invention

The object of the present invention is to overcome the disadvantages of the prior art and provide a safe and reliable magnetic latching relay with overcurrent protection which can effectively protect the circuit when the circuit is overcurrent and short circuited.

The purpose of the present invention is achieved in this way: a magnetic latching relay with overcurrent protection includes a base and an electromagnetic coil on the base, a yoke is provided at both ends of the base, and a yoke is arranged between the two yokes. There is a driving arm assembly, and a contact piece that can be driven by the driving arm assembly is provided on one side of the base. Power supply circuit, load and contact circuit connection.

The overcurrent protection coil is coaxial with the electromagnetic coil and arranged inside and outside.

The overcurrent protection coil is coaxial with the electromagnetic coil and arranged up and down.

Compared with the magnetic latching relay of the prior art, the present invention has the following advantages:

An overcurrent protection coil is provided on the magnetic force line circuit of the relay electromagnetic coil, and the two terminals of the overcurrent protection coil are connected with the power supply circuit, the load and the contact circuit. When the circuit is over-current or short-circuited, and the circuit current exceeds the preset threshold current of the over-current protection coil, the over-current protection coil will generate a magnetic field force large enough to overturn the magnetic latching relay, drive the contacts to separate and disconnect the circuit, And the current state is memorized by the relay itself, which effectively protects the circuit loop with overcurrent or short circuit, which is safe and reliable.

Description of drawings

Accompanying drawing 1 is the structural representation of the preferred embodiment of the present invention.

Accompanying drawing 2 is the structure diagram of embodiment 2 of the present invention.

Accompanying drawing 3 is the structure diagram of embodiment 3 of the present invention.

Accompanying drawing 4 is the structure diagram of embodiment 4 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

According to FIG. 1 and FIG. 2 , the magnetic latching relay with overcurrent protection of the present invention includes a base 1 and an electromagnetic coil 2 arranged on the base 1 , and an iron core is generally provided in the middle of the electromagnetic coil 2 . A yoke 3 is provided at both ends of the base 1, and a driving arm assembly 4 is provided between the two yokes 3. The driving arm assembly 4 is movably positioned between the two yokes through a connecting piece, and generally has a magnetic Steel, wherein the drive arm assembly 4 can be a rotating structure, as shown in Figures 1 and 2, or a straight, movable structure, as shown in Figures 3 and 4. One side of the base 1 is provided with a contact piece, which can be a double-reed structure or a multi-reed structure, and includes at least one set of normally closed or normally open static reeds and a movable one that can be driven by the drive arm assembly 4. For the reed, when the electromagnetic coil 2 is supplied with pulse currents in different directions, the driving arm assembly 4 drives the moving reed to move, realizing the contact between the moving reed and the static reed, and achieving the closure or disconnection of the control circuit. At the same time, in order to make the magnetic latching relay have over-current and short-circuit protection capabilities, an over-current protection coil 6 is provided on the magnetic force line circuit of the electromagnetic coil 2, and the two terminals of the over-current protection coil 6 are connected to the power supply circuit, the load 7 and the contact circuit. connection, and, in order to avoid misoperation of the overcurrent protection coil 6, if the circuit allows, the threshold value of the protection current calculated and set by the overcurrent protection coil 6 should be several times or more than the rated current of the circuit. Moreover, according to actual design and manufacturing requirements, the overcurrent protection coil 6 is coaxial with the electromagnetic coil 2 and arranged inside and outside. and the electromagnetic coil 2 are separated by sufficient insulation, as shown in Figure 1 and Figure 3; at the same time, the overcurrent protection coil 6 and the electromagnetic coil 2 can also be coaxially arranged in the insulating protective layer and arranged up and down, as shown in Figure 2 and Figure 4 shows. When the circuit is over-current or short-circuited, and the circuit current exceeds the preset threshold current of the over-current protection coil 6, the over-current protection coil 6 will generate a magnetic field force large enough to overturn the magnetic latching relay, driving the two contacts to separate and break. The circuit is open, and the current state of the contact piece is memorized by the relay, keeping the circuit in the disconnected state, effectively protecting the circuit circuit with overcurrent or short circuit, and greatly improving the safety and reliability of the circuit.

Claims (3)

1. A magnetic latching relay with overcurrent protection, comprising a base (1) and an electromagnetic coil (2) arranged on the base (1), and a yoke (3) at both ends of the base (1) , a drive arm assembly (4) is provided between the two yokes (3), and a contact piece (5) that can be driven by the drive arm assembly (4) is provided on one side of the base (1), characterized in that: An overcurrent protection coil (6) is provided on the magnetic field line circuit of the electromagnetic coil (2), and the two terminals of the overcurrent protection coil (6) are connected to the power supply circuit, the load (7) and the contact piece (5) circuit. 2. The magnetic latching relay according to claim 1, characterized in that: the overcurrent protection coil (6) is coaxial with the electromagnetic coil (2) and arranged inside and outside. 3. The magnetic latching relay according to claim 1, characterized in that: the overcurrent protection coil (6) is coaxial with the electromagnetic coil (2) and arranged up and down.