CN103065878A - Permanent magnet solenoid type contactor - Google Patents

Abstract

The invention discloses a permanent magnet solenoid type contactor, and belongs to the field of high-power electrical appliances of power transmission and distribution devices. The permanent magnet solenoid type contactor solves the problems that an existing direct current solenoid type contactor rebounds after the direct current solenoid type contactor is closed and coils are large in energy consumption. A cylindrical iron core is arranged inside a shell and is coaxial with the shell, a round-ring-shaped permanent magnet is arranged between the bottom of the shell and the upper end face of the cylindrical iron core, the round-ring-shaped permanent magnet contacts the bottom of the shell and the upper end face of the cylindrical iron core closely, and the round-ring-shaped permanent magnet is magnetized along the axial direction of the cylindrical iron core. Magnet exciting coils are arranged in the radial gaps of the shell and the cylindrical iron core, an armature is embedded in a cavity of the cylindrical iron core, one end of a connecting rod is fixedly connected with the armature, the connecting rod and the shell are coaxial, a counter-force spring is sleeved on the connecting rod and arranged between the armature and a yoke, and a rebounding spring is sleeved outside the connecting rod and arranged between a bridge type contact and the connecting rod. The permanent magnet solenoid type contactor is applicable to the direct current solenoid type contactor.

Description

Permanent magnet solenoid contactor

technical field

The invention belongs to the field of high-power electrical appliances of power transmission and distribution equipment, and specifically relates to a direct current permanent magnet solenoid contactor.

Background technique

At present, there are problems restricting the performance of the product in terms of the dynamic characteristics of the DC solenoid contactor, such as closing bounce and breaking arc phenomenon. In addition, when the contactor is working, it is necessary to energize the coil to generate electromagnetic attraction to maintain the pull-in state. However, for a long time The high temperature rise caused by electrification will easily cause the coil to burn out, and at the same time increase the energy consumption of the coil.

Contents of the invention

The present invention proposes a permanent magnet solenoid contactor in order to solve the problems of closing bounce and high energy consumption of coils in the existing DC solenoid contactor.

Permanent magnet solenoid contactor, which includes a shell, a cylindrical iron core, a connecting rod, an excitation coil, an armature, a yoke, a reaction spring, a rebound spring and a bridge contact. The shell is barrel-shaped, and its characteristics In that: it also includes a ring-shaped permanent magnet, the cylindrical iron core is located inside the shell, and the cylindrical iron core is coaxial with the shell, the ring-shaped permanent magnet is arranged on the bottom of the shell and the cylindrical iron core between the upper end faces of the core, and the ring-shaped permanent magnet is in close contact with the bottom of the casing and the upper end face of the cylindrical iron core, and the ring-shaped permanent magnet is magnetized along the axial direction of the cylindrical iron core , the excitation coil is located in the radial gap between the casing and the cylindrical iron core, the armature is embedded in the cavity of the cylindrical iron core, one end of the connecting rod is fixedly connected with the armature, and the connecting rod is coaxial with the casing, and the yoke covers And fixed on the opening side of the shell, the other end of the connecting rod passes through the yoke and is fixedly connected with the bridge contact. There is a gap between the outer wall of the connecting rod and the yoke, and the reaction spring is sleeved on the connecting rod. And it is located between the armature and the yoke, and the outside of the connecting rod is covered with a rebound spring, and the rebound spring is located between the bridge contact and the connecting rod.

In order to solve the above problems, in the technical solution of the present invention, permanent magnets are creatively added to the solenoid electromagnetic mechanism, and by adjusting the dynamic characteristics of the electromagnetic mechanism of the permanent magnet solenoid contactor, the closing speed is reduced, the breaking speed is increased, and the To achieve the purpose of loss of voltage protection and low holding power consumption of the contactor.

The invention adds annular permanent magnets to the solenoid electromagnetic mechanism of the DC contactor and increases the overtravel, so that the armature is subjected to suction force when it is not energized, thus reducing the minimum pull-in voltage while the initial reaction force remains unchanged. , thereby reducing the closing speed of the contacts, which is beneficial to suppress the generation of closing bounce; due to the effect of the permanent magnet, when the armature is in the pull-in position, the coil only needs to pass a small current to keep the pull-in, thereby reducing Reduced power consumption; when the voltage is 0, the moving and static contacts are disconnected under the reaction force, and the contactor has the function of voltage loss protection; due to the increase of overtravel, the maximum reaction force increases, and the coil is reversed when breaking The directing current is used to counteract the effect of the permanent magnet, so the breaking speed of the contact increases. While achieving the improvement of the above characteristics, it does not increase the volume or weight of the contactor, which contributes to the miniaturization and weight reduction of the contactor.

After the permanent magnet mechanism is closed, the coil can realize the function of maintaining the closed position without energization or low current, which has very high reliability, and at the same time requires very little operating power, which is less affected by grid voltage fluctuations and can be realized Maintenance-free operation.

Description of drawings

Figure 1 is a schematic diagram of the structure of a permanent magnet solenoid contactor,

Figure 2 is a flow chart of the working process of the permanent magnet solenoid contactor.

Detailed ways

Specific Embodiment 1: Referring to Fig. 1 to illustrate this embodiment, the permanent magnet solenoid contactor described in this embodiment includes a housing 1, a cylindrical iron core 3, a connecting rod 4, an excitation coil 5, an armature 6, Yoke iron 7, reaction force spring 8, rebound spring 9 and bridge contact 10, shell 1 is barrel-shaped, is characterized in that: it also includes annular permanent magnet 2, and described cylindrical iron core 3 is positioned at Inside the casing 1, and the cylindrical iron core 3 is coaxial with the casing 1, the annular permanent magnet 2 is arranged between the bottom of the casing 1 and the upper end surface of the cylindrical iron core 3, and the annular The permanent magnet 2 is in close contact with the bottom of the casing 1 and the upper end surface of the cylindrical iron core 3. The annular permanent magnet 2 is magnetized along the axial direction of the cylindrical iron core 3. The excitation coil 5 is located between the casing 1 and the In the radial gap of the cylindrical iron core 3, the armature 6 is embedded in the cavity of the cylindrical iron core 3, and one end of the connecting rod 4 is fixedly connected with the armature 6, and the connecting rod 4 is coaxial with the housing 1, and the yoke 7 covers and is fixed on the opening side of the casing 1, and the other end of the connecting rod 4 passes through the yoke 7 and is fixedly connected with the bridge contact 10. There is a gap between the outer side wall of the connecting rod 4 and the yoke 7, and the The power spring 8 is set on the connecting rod 4 and is located between the armature 6 and the yoke 7. The outside of the connecting rod 4 is also covered with a rebound spring 9, and the rebound spring 9 is located between the bridge contact 10 and the connecting rod 4. between.

Embodiment 2: The difference between this embodiment and the permanent magnet solenoid contactor described in Embodiment 1 is that: the shell 1, the cylindrical iron core 3, the armature 6 and the yoke 7 all adopt high magnetic made of conductive material.

Embodiment 3: The difference between this embodiment and the permanent magnet solenoid contactor described in Embodiment 1 is that: the bridge contact 10 is composed of a moving contact and a static contact.

Embodiment 4: The difference between this embodiment and the permanent magnet solenoid contactor described in Embodiment 1 is that the inner diameter of the annular permanent magnet 2 is the same as that of the cylindrical iron core 3 .

The working process of the permanent magnet solenoid contactor is as follows: as shown in Figure 2, the excitation coil 5 is energized, so that the excitation coil 5 generates a magnetic field, and the magnetic field and the magnetic field generated by the circular permanent magnet 2 work together to make the armature 6 in the Operate under a small coil current to make the moving contact and static contact of the bridge contact 10 reach the pull-in state;

When the armature 6 is closed, a small maintenance voltage is applied to the excitation coil 5, so that the magnetic field of the annular permanent magnet 2 and the excitation coil 5 generates an attraction force greater than the spring reaction force, so that the moving contact of the bridge contact 10 and the The static contact remains closed;

When releasing, pass a reverse current to the excitation coil 5, thereby changing the direction of the magnetic field generated by the excitation coil 5. This magnetic field offsets the magnetic field generated by the circular permanent magnet 2, and the armature 6 moves in the reverse direction under the action of the reaction force, driving the bridge The moving contact and the static contact of the type contact 10 are disconnected.

The excitation coil 5 of the present invention and the ring-shaped permanent magnet 2 work together to make the armature 6 operate under a small coil current, which reduces the touch current and pull-in voltage, limits the increase of the closing speed, and suppresses the closing rebound phenomenon;

When the coil voltage is 0, the contactor cannot maintain the pull-in state and automatically disconnects, which has the effect of voltage loss protection;

After the armature is closed, a small holding voltage is applied to the excitation coil, so that the suction force jointly generated by the circular permanent magnet and the field coil magnetic field is greater than the spring reaction force, and the contactor can keep pulling in, which reduces the holding power consumption of the coil ;

The increase of the overtravel and the increase of the maximum reaction force make the breaking speed of the armature 6 greater, and increase the breaking speed of the moving contact and the static contact of the bridge contact 10 .

Claims (4)

1. Permanent magnetic solenoid contactor, which includes shell (1), cylindrical iron core (3), connecting rod (4), excitation coil (5), armature (6), yoke (7), reverse Power spring (8), rebound spring (9) and bridge contact (10), shell (1) is barrel-shaped, is characterized in that: it also comprises annular permanent magnet (2), and described cylinder The shaped iron core (3) is located inside the shell (1), and the cylindrical iron core (3) is coaxial with the shell (1), and the annular permanent magnet (2) is arranged on the bottom and the circle of the shell (1) between the upper end surfaces of the cylindrical iron core (3), and the circular permanent magnet (2) is in close contact with the bottom of the casing (1) and the upper end surface of the cylindrical iron core (3), the circular The annular permanent magnet (2) is magnetized along the axial direction of the cylindrical iron core (3), the exciting coil (5) is located in the radial gap between the casing (1) and the cylindrical iron core (3), and the armature (6 ) is embedded in the cavity of the cylindrical iron core (3), one end of the connecting rod (4) is fixedly connected with the armature (6), and the connecting rod (4) is coaxial with the housing (1), and the yoke (7) Cover and fix on the opening side of the housing (1), the other end of the connecting rod (4) passes through the yoke (7) and is fixedly connected with the bridge contact (10), the outer wall of the connecting rod (4) and the yoke There is a gap between the irons (7), the reaction force spring (8) is sleeved on the connecting rod (4), and is located between the armature (6) and the yoke (7), and the outside of the connecting rod (4) is also covered with A rebound spring (9), said rebound spring (9) is located between the bridge contact (10) and the connecting rod 4. 2. The permanent magnet solenoid contactor according to claim 1, characterized in that: the casing (1), cylindrical iron core (3), armature (6) and yoke (7) are all made of high Made of magnetically permeable materials. 3. The permanent magnet solenoid contactor according to claim 1, characterized in that: the bridge contact (10) is composed of a moving contact and a static contact. 4. The permanent magnet solenoid contactor according to claim 1, characterized in that: the inner diameter of the annular permanent magnet (2) is the same as the inner diameter of the cylindrical iron core (3).

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