CN101202181B - Permanent Magnetic Contactor Operating Mechanism - Google Patents

Abstract

The permanent magnetic contactor operating mechanism is provided with a moving iron core (5) at the upper end of the molded case bracket (4), the upper end of the second spring (6) bears against the lower part of the moving iron core (5), and the second spring (6) The lower end is pushed against the lower part of the molded case bracket (4); the static iron core (8) has two parts, a permanent magnet (9) is arranged between the two parts, and coils are respectively arranged on the two parts of the static iron core (8) (7), the upper part of the two-part static iron core (8) is located at the lower part of the molded casing support (4); the contact drive shaft (1) passes through the middle of the plastic casing support (4) and the moving iron core (5), and is located at The end of the contact drive shaft (1) in the molded case bracket (4) is provided with a support (12); the first spring (3) is sleeved on the outside of the contact drive shaft (1), and the contact spring (11) is located on the contact The upper part inside the head drive shaft (1), the moving contact (10) is located on the upper part outside the contact drive shaft (1), and the static contact (2) is located between the moving contact (10) and the molded case bracket (4) .

Description

Permanent Magnetic Contactor Operating Mechanism

technical field

The invention relates to the field of low-voltage electrical appliances of power transmission and distribution equipment, in particular to the technical field of closing and opening driving mechanisms of low-voltage AC and DC contactors.

Background technique

The traditional electromagnetic contactor, its driving mechanism is composed of silicon steel laminated iron core or soft iron core with electromagnetic coil. When working, the power is kept on, and such a mechanism has disadvantages such as high energy consumption, high noise, and frequent contact bouncing.

The permanent magnet mechanism that appeared in recent years has attracted widespread attention due to its simple structure, few parts and high reliability, and has been continuously improved and innovated. The permanent magnet contactor has the characteristics of low noise, little influence from grid voltage fluctuation, and remarkable energy-saving effect.

The typical structures of existing permanent magnet contactor operating mechanisms are double E-shaped, U-shaped and circular, mainly including permanent magnets, moving iron cores, static iron cores and coils, and permanent magnets can be placed on moving iron cores or static iron cores etc. position. In the published patent, the working principle of the permanent magnet operating mechanism is to use the pulse current in the coil to generate the same and opposite magnetic field as the permanent magnet magnetic field in the iron core when the control unit circuit is in the normal working state, so as to realize closing and opening. brake. The pulse current required for opening is provided by the energy storage capacitor of the voltage loss protection device in the control circuit. In actual use, the installer or user often needs to test the performance of the permanent magnet contactor contacts, and manual closing is required. However, at this time, the voltage loss protection device in the control circuit has no energy storage. Once the manual closing is performed, the contactor cannot automatically close. Reset brings inconvenience to actual use.

A common disadvantage of the existing published permanent magnet contactor patents is that when the contactor is not energized, it cannot be automatically reset by manual pressing or has an automatic reset function but needs to pass a small maintenance current to the coil, which cannot fully achieve the purpose of energy saving . For example, the patent number is 200420065379.6, and the patent name is "a permanent magnet mechanism for low-voltage contactor"; the patent number is 200420112660.0, and the patent name is "a permanent magnet contactor operation" patent, etc.

Contents of the invention

Technical problem: In view of the deficiencies in the above-mentioned existing permanent magnet contactor technology, the purpose of the present invention is to provide a permanent magnet contactor operating mechanism. Through the improvement of the existing permanent magnet contactor operating mechanism, the contactor The structure of the separation of the head drive shaft and the moving iron core realizes the function of automatically breaking the contactor when the contactor is not energized without changing the energy-saving effect of the existing permanent magnet contactor. In particular, it completely solves the problem that the permanent magnet contactor cannot be automatically broken after manual closing. The opening performance of the permanent magnetic contactor under manual test conditions can achieve the same effect as that of the electromagnetic contactor. At the same time, the energy-saving effect of the permanent magnetic contactor can be fully utilized.

Technical solution: The operating mechanism of the permanent magnet contactor mainly includes a contact drive shaft, a static contact, a moving contact, a first spring, a molded case bracket, a moving iron core, a static iron core, a second spring, and a contact spring , coils, permanent magnets and supports; when it is a U-shaped structure, a moving iron core is provided at the upper end of the plastic case bracket, the upper end of the second spring is against the lower part of the moving iron core, and the lower end of the second spring is against the plastic case In the lower part of the bracket, the second spring provides the reaction force of the moving iron core; the static iron core has two parts, a permanent magnet is arranged between the two parts of the static iron core, and coils are respectively arranged on the two parts of the static iron core, and between the two coils Connected together in series, the upper part of the two parts of the static iron core is located at the lower part of the plastic case bracket; the contact drive shaft passes through the middle of the plastic case support and the moving iron core to realize the separation of the contact drive shaft and the moving iron core, and is located on the contact drive shaft There is a support at the end, which is used to drive the contact drive shaft to move when the moving iron core moves; the first spring is sleeved outside the contact drive shaft to fix the contact drive shaft and provide feedback to the contact drive shaft at the same time. Force; the contact spring is located on the upper part of the contact drive shaft, the moving contact is located on the upper part outside the contact drive shaft, and the static contact is located between the contact drive shaft and the molded case support. When the operating mechanism is a double E-shaped structure, both the moving iron core and the static iron core are of E-shaped structure, and a rare earth permanent magnet is embedded on the core column of the static iron core of the operating mechanism to form a composite iron core. When it is a circular structure, holes are made on the moving iron core of the operating mechanism to realize the separation of the contact drive shaft and the moving iron core. Two springs, permanent magnets are inlaid on the core post of the static iron core.

When the contactor is in the opening state, the permanent magnet's attraction to the moving iron core is not enough to overcome the reaction force of the spring group to reach the pull-in state, and the permanent magnet contactor is in the stable state of opening.

When the contactor is manually closed, since the contact drive shaft is separated from the moving iron core, the contact drive shaft moves downward, and the moving iron core is in the holding position. In this state, the air gap between the moving iron core and the static iron core is relatively large, and the suction force generated by the permanent magnet on the moving iron core is not enough to overcome the reaction force of the second spring to keep the contactor in the state of attraction, so when it is released , the contact drive shaft moves upward under the action of the first spring reaction force and the contact spring reaction force, and finally returns to the opening state.

When the coil is supplied with current, the magnetic force generated by the synthetic magnetic potential of the permanent magnet and the coil is greater than the reaction force of the spring group, so that the moving iron core starts to move downward. At this time, the moving iron core drives the contact drive shaft to move downward, so that The contactor is closed. In the closed state, the air gap between the moving iron core and the static iron core is small, and the suction force generated by the permanent magnet can keep the moving iron core and the static iron core in the suction state, so that the permanent magnet contactor can maintain the suction force without energizing the coil. The purpose of the state.

Beneficial effects: the structure in which the contact drive shaft is separated from the moving iron core is adopted, and when the permanent magnet contactor is not powered, the contactor can be manually closed to realize the automatic opening function. The present invention aims at the deficiencies in the above-mentioned existing permanent magnet contactor technology, by improving the operating mechanism of the existing permanent magnet contactor, it adopts a structure in which the contact drive shaft and the moving iron core are separated, and realizes In the case of the energy-saving effect of some permanent magnet contactors, when the contactor is not energized, the contactor can be automatically broken by manually closing the contactor. In particular, it completely solves the problem that the permanent magnet contactor cannot be automatically broken after manual closing. The opening performance of the permanent magnetic contactor under manual test conditions can achieve the same effect as that of the electromagnetic contactor. At the same time, the energy-saving effect of the permanent magnetic contactor can be fully utilized.

Description of drawings

Figure 1 is a schematic diagram of the U-shaped structure of a permanent magnet contactor: contact drive shaft 1, static contact 2, first spring 3, molded case bracket 4, moving iron core 5, second spring 6, coil 7, and static iron core 8 , permanent magnet 9, moving contact 10, contact spring 11, support 12;

Figure 2 is a schematic diagram of a U-shaped structure contactor in an open state;

Figure 3 is a schematic diagram of the state of the U-shaped structure when the contactor is manually closed;

Fig. 4 is a schematic diagram of a U-shaped contactor in a closing state;

Figure 5 is a schematic diagram of the double E-type structure of the permanent magnetic contactor;

Figure 6 is a schematic diagram of the double E-type contactor in the opening state;

Figure 7 is a schematic diagram of the state of the double E-type structure when the contactor is manually closed;

Fig. 8 is a schematic diagram of a double E-type contactor in a closing state;

Fig. 9 is a schematic diagram of the circular structure of the permanent magnetic contactor;

Fig. 10 is a schematic diagram of a contactor with a circular structure in an opening state;

Figure 11 is a schematic diagram of the state of the circular structure when the contactor is manually closed;

Fig. 12 is a schematic diagram of a contactor with a circular structure in a closing state.

Detailed ways

The U-shaped structure of the permanent magnet contactor operating mechanism of the present invention, as shown in (Fig. 1), mainly consists of a contact drive shaft 1, a static contact 2, a first spring 3, a molded case support 4, and a moving iron core 5 , The second spring 6, the coil 7, the static iron core 8, the permanent magnet 9, the moving contact 10, the contact spring 11, and the support 12 are composed. Its structural features are: a moving iron core 5 is provided at the upper end of the molded case bracket 4, the upper end of the second spring 6 is pushed against the lower part of the moving iron core 5, and the lower end of the second spring 6 is pushed against the lower part of the plastic case bracket 4. The second spring 6 provides the reaction force of the moving iron core 5; the static iron core 8 has two parts, a permanent magnet 9 is arranged between the two parts of the static iron core 8, and a coil 7 is respectively arranged on the two parts of the static iron core 8, and the two coils 7 The upper part of the two parts of the static core 8 is located in the lower part of the molded case bracket 4; the contact drive shaft 1 passes through the middle of the molded case support 4 and the moving iron core 5 to realize the connection between the contact drive shaft 1 and the moving core 5. The iron core 5 is separated, and there is a support 12 at the end of the contact drive shaft 1, which is used to drive the contact drive shaft 1 to move when the moving iron core 5 moves, and the contact drive shaft 1 is for automatic opening after manual closing. The main executive part, the contact drive shaft 1 is made of non-magnetic material; the first spring 3 is set on the outside of the contact drive shaft 1 to fix the contact drive shaft 1 and provide the feedback of the contact drive shaft 1 at the same time. Force; the contact spring 11 is located on the upper part of the contact drive shaft 1, the moving contact 10 is located on the upper part outside the contact drive shaft 1, and the static contact 2 is located between the contact drive shaft 1 and the molded case bracket 4. When the contactor is in the opening state (as shown in Figure 2), since the air gap is relatively large, the suction force generated by the permanent magnet 9 on the moving iron core 5 is not enough to overcome the force of the first spring 3, the second spring 6 and the contact spring 11. The resultant force of the reaction force reaches the pull-in state, and the contactor is in the stable state of opening.

When the contactor is manually closed, since the contact drive shaft 1 is separated from the moving iron core 5, the contact drive shaft 1 moves downward, and the moving iron core 5 remains in place. In this closed state (as shown in Figure 3), since the position of the moving iron core 5 remains stationary, the air gap between the moving iron core 5 and the static iron core 8 is relatively large, and the suction force generated by the permanent magnet 9 to the moving iron core 5 is not enough to overcome the second The reaction force of the spring 6 makes the moving iron core 5 pull in. When the hand is released, the contact drive shaft 1 moves upward under the reaction force of the first spring 3 and the contact spring 11, and finally returns to the opening state (as shown in the figure 2).

As shown in Figure 2, when the switch is closed, the coil 7 passes forward current, the magnetic field generated by the coil 7 is in the same direction as the magnetic field of the permanent magnet 9, and the suction force generated by the synthetic magnetic potential is greater than that of the first spring 3, the second spring 6 and the contacts The reaction force of the spring 11 causes the moving iron core 5 of the contactor to move downward, and the movement of the moving iron core 5 drives the contact drive shaft 1 to move downward, so that the contactor reaches the closing position (as shown in Figure 4). In this state, the attractive force generated by the permanent magnet 9 keeps the switch closed, so that the permanent magnetic contactor can be kept in the closed state without energizing the coil 7 .

As shown in Figure 4, when the brake is opened, the coil 7 passes a reverse current, the magnetic field generated by the coil 7 is opposite to the magnetic field of the permanent magnet 9, and the suction force generated by the combined magnetic potential is smaller than that of the first spring 3, the second spring 6 and the contacts. The reaction force of the spring 11 and the reaction force of the second spring 6 make the moving iron core 5 of the contactor move upward, and the reaction force of the first spring 3 and the contact spring 11 makes the contact drive shaft 1 move upward, and the contactor realizes opening (as shown in Figure 2).

The permanent magnetic contactor operating mechanism of the present invention is shown in the double E-type structure (as shown in Figure 5), mainly by the contact drive shaft 1, the static contact 2, the first spring 3, the molded case bracket 4, and the moving iron core 5 , the second spring 6, the coil 7, the static iron core 8, the permanent magnet 9, the moving contact 10, the contact spring 11, and the support 12; it is characterized in that: the moving iron core 5 and the static iron core 8 are E-shaped, and are mounted on the molded case bracket The upper end in 4 is provided with moving iron core 5, and the upper end of second spring 6 bears on the bottom of moving iron core 5, and the lower end of second spring 6 bears on the lower part of molded case bracket 4, and this second spring 6 provides moving iron core 5 The static iron core 8 is provided with a coil 7, and a rare earth permanent magnet 9 is inlaid on the core column of the static iron core 8 to form a composite iron core; the contact drive shaft 1 passes through the middle of the molded case bracket 4 and the moving iron core 5 to realize contact The transmission shaft 1 is separated from the moving iron core 5, and there is a support 12 at the end of the contact transmission shaft 1, which is used to drive the contact transmission shaft 1 to move when the moving iron core 5 moves, and the contact transmission shaft 1 is made of non-magnetic material Made; the first spring 3 is set on the outside of the contact drive shaft 1, used to fix the contact drive shaft 1, and at the same time provide the reaction force of the contact drive shaft 1; the contact spring 11 is located inside the contact drive shaft 1 In the upper part, the movable contact 10 is located on the upper part outside the contact transmission shaft 1 , and the static contact 3 is located between the contact transmission shaft 1 and the molded case support 4 . When the contactor is in the opening state (as shown in Figure 6), the suction force generated by the permanent magnet 9 on the moving iron core 5 is not enough to overcome the reaction force of the first spring 3, the second spring 6 and the contact spring 11 to reach In the pull-in state, the contactor is in a stable state of opening.

When the contactor is manually closed, since the contact drive shaft 1 is separated from the moving iron core 5, the contact drive shaft 1 moves downward, and the moving iron core 5 remains in place. When the contactor is manually closed (as shown in Figure 7), since the position of the moving iron core 5 remains still, the air gap between the moving iron core 5 and the static iron core 8 is relatively large, and the suction force generated by the permanent magnet 9 on the moving iron core 5 is not enough Overcome the reaction force of the second spring 6 to make the moving iron core 5 pull in, so when the hand is released, the contact drive shaft 1 moves upward under the reaction force of the first spring 3 and the contact spring 11, and finally returns to the opening status (as shown in Figure 6).

As shown in Figure 6, when the switch is closed, the coil 7 passes forward current, the magnetic field generated by the coil 7 is in the same direction as the magnetic field of the permanent magnet 9, and the suction force generated by the synthetic magnetic potential is greater than that of the first spring 3, the second spring 6 and the contacts The reaction force of the spring 11 makes the moving iron core 5 of the contactor move downward, and the movement of the moving iron core 5 drives the contact drive shaft 1 to move downward, so that the contactor reaches the closing position (as shown in Figure 8). In this state, since the air gap is relatively small, the attraction force generated by the permanent magnet 9 achieves the purpose that the permanent magnet contactor can be kept in the attracting state without energizing the coil 7 .

As shown in Figure 8, when the brake is opened, the coil 7 passes a reverse current, and the magnetic field generated by the coil 7 is opposite to that of the permanent magnet 9, and the suction force generated by the combined magnetic potential is smaller than that of the first spring 3, the second spring 6 and the contacts. The reaction force of the spring 11 and the reaction force of the second spring 6 make the moving iron core 5 of the contactor move upward, and the reaction force of the first spring 3 and the contact spring 11 makes the contact drive shaft 1 move upward, and the contactor realizes opening (as shown in Figure 6).

As shown in the circular structure of the permanent magnet contactor operating mechanism of the present invention (as shown in Figure 9), it mainly includes a contact transmission shaft 1, a static contact 2, a first spring 3, a molded case bracket 4, a moving iron core 5, The second spring 6, the coil 7, the static iron core 8, the permanent magnet 9, the movable contact 10, the contact spring 11, and the support 12; it is characterized in that: the second spring 6 is fixed on the upper end surface of the molded case support 4 of the coil 7, Supported on the lower end surface of the T-shaped moving iron core 5, the second spring 6 provides the reaction force of the moving iron core 5, and the moving iron core 5 is inserted into the cavity of the molded case bracket 4 of the coil 7, and a hole is opened in the moving iron core 5 to realize the contact The drive shaft 1 is separated from the moving iron core 5, and a support 12 is provided at the end of the contact drive shaft 1, which is used to drive the contact drive shaft 1 to move when the moving iron core 5 moves; A permanent magnet 9 is inlaid on the core post of the static iron core 8 to form a composite iron core. The first spring 3 is set on the outside of the contact drive shaft 1 to fix the contact drive shaft 1 and provide the reaction force of the contact drive shaft 1 at the same time. The contact drive shaft 1 is made of non-magnetic material; the contact The spring 11 is located on the upper part of the contact drive shaft 1 , the movable contact 10 is located on the upper part outside the contact drive shaft 1 , and the upper part of the first spring 3 and the lower part of the movable contact 10 are provided with a static contact 2 . When the contactor is in the opening state (as shown in Figure 10), the suction force produced by the permanent magnet 9 on the moving iron core 5 is not enough to overcome the reaction force of the first spring 3, the second spring 6 and the contact spring 11 to reach In the pull-in state, the contactor is in a stable state of opening.

When the contactor is manually closed, since the contact drive shaft 1 is separated from the moving iron core 5, the contact drive shaft 1 moves downward, while the moving iron core 5 remains in place. In this closing state (as shown in Figure 11), since the position of the moving iron core 5 remains unchanged, the air gap between the moving iron core 5 and the static iron core 8 is relatively large, and the suction force generated by the permanent magnet 9 on the moving iron core 5 is not enough to overcome The reaction force of the second spring 6 makes the moving iron core 5 pull in, so when the hand is released, the contact drive shaft 1 moves upward under the reaction force of the first spring 3 and the contact spring 11, and finally returns to the opening state (Figure 10).

As shown in Figure 10, when the switch is closed, the coil 7 passes forward current, the magnetic field generated by the coil 7 is in the same direction as the magnetic field of the permanent magnet 9, and the suction force generated by the synthetic magnetic potential is greater than that of the first spring 3, the second spring 6 and the contacts The reaction force of the spring 11 makes the moving iron core 5 of the contactor move downward, and the movement of the moving iron core 5 drives the contact drive shaft 1 to move downward, so that the contactor reaches the closing position (as shown in Figure 12). In this state, since the air gap is relatively small, the suction force generated by the permanent magnet 9 keeps the switch closed, so that the permanent magnetic contactor can be kept in the closed state without energizing the coil 7 .

As shown in Figure 12, when the brake is opened, the coil 7 passes a reverse current, the magnetic field generated by the coil 7 is opposite to that of the permanent magnet 9, and the suction force generated by the combined magnetic potential is smaller than that of the first spring 3, the second spring 6 and the contacts. The reaction force of the spring 11 and the reaction force of the second spring 6 make the moving iron core 5 of the contactor move upward, and the reaction force of the first spring 3 and the contact spring 11 makes the contact drive shaft 1 move upward, and the contactor realizes opening (Figure 10).

In addition, the installation position of the permanent magnet 9 in the permanent magnet contactor operating mechanism can also be installed in different positions of the moving iron core 5 and the static iron core 8 according to actual needs, and will not be repeated here.

Claims (2)

1. a permanent magnetism contactor operation mechanism is characterized in that this operating mechanism comprises contact power transmission shaft (1), fixed contact (2), first spring (3), moulds shell support (4), moves (5), second spring (6) unshakable in one's determination, coil (7), fixed core (8), permanent magnet (9), moving contact (10), touch spring (11), support (12); Wherein, the upper end in moulding shell support (4) is provided with moving (5) unshakable in one's determination, and the upper end of second spring (6) withstands on the bottom of moving (5) unshakable in one's determination, and the lower end of second spring (6) withstands on the bottom of moulding in the shell support (4); Fixed core (8) has two parts, is provided with permanent magnet (9) between these two parts, is respectively equipped with coil (7) on this two parts fixed core (8), and the top of this two parts fixed core (8) is positioned at the bottom of moulding shell support (4); Contact power transmission shaft (1) passes the centre of moulding shell support (4) and moving (5) unshakable in one's determination, is positioned at contact power transmission shaft (1) end of moulding shell support (4) and is provided with support (12); First spring (3) is enclosed within the outside of contact power transmission shaft (1), touch spring (11) is positioned at the top of contact power transmission shaft (1), moving contact (10) is positioned at the outer top of contact power transmission shaft (1), and fixed contact (2) is positioned at moving contact (10) and moulds between the shell support (4).

2. permanent magnetism contactor operation mechanism as claimed in claim 1 is characterized in that operating mechanism is circular, and the moving iron core (5) of its operating mechanism is the T type.

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