Contactor capable of setting initial state of contact

Abstract

The utility model discloses a contactor capable of setting the initial state of a contact, and belongs to the technical field of contactors. The coil is arranged in the magnetizer; the first permanent magnet is arranged at one end of the coil; the pole piece is arranged on the first permanent magnet; the second permanent magnet is arranged at the other end of the coil; the movable iron core is arranged in the coil; the bracket is connected with the movable iron core; the contactor capable of setting the initial state of the contact comprises a support, a contact bridge connected with the support, and the contact matched with the contact bridge, the initial state of the contactor capable of setting the initial state of the contact can be manually set, and the contactor can be set to be normally open and can also be set to be normally closed; and the structure is reasonable, the same product can be set to be normally open or normally closed when leaving a factory according to requirements, the application range of the product is expanded, and the variety and inventory of the product are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of contactors, and in particular relates to a contactor capable of setting an initial state of a contact. Background Art

[0002] The three-phase AC contactors currently used in my country are generally normally open contactors. However, in some situations where the contactor is energized for a long time, a normally closed contactor is actually needed. For example, in some emergency power supplies and rescue power supplies, the three-phase AC contactor is usually in the energized state, the coil is always consuming energy, and it also generates heat for a long time, which can easily burn the coil. It is necessary to develop a contactor that can set the initial state of the contacts to be normally closed to meet the needs of this scenario. Utility Model Content

[0003] The utility model aims to provide a contactor capable of setting the initial state of the contacts, so as to solve the problem that the AC contactor is always in the attracted state, the coil is always consuming energy and generating heat for a long time.

[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: a contactor capable of setting the initial state of a contact, comprising:

[0005] Magnetic conductor;

[0006] A coil disposed in the magnetic conductor;

[0007] A first permanent magnet disposed at one end of the coil;

[0008] A pole piece disposed on the first permanent magnet;

[0009] a second permanent magnet disposed at the other end of the coil;

[0010] A moving iron core disposed within the coil;

[0011] A bracket connected to the moving iron core;

[0012] a contact bridge connected to the bracket;

[0013] A contact cooperates with the contact bridge.

[0014] Preferably, when the bracket is pushed by an external force, the contact bridge and the contact are in a closed state.

[0015] Preferably, when the bracket is pushed by an external force, the contact bridge and the contact are in a disconnected state.

[0016] Preferably, a contact spring is provided between the bracket and the contact bridge.

[0017] Preferably, the moving iron core passes through the pole piece and is connected to the bracket, and the stroke of the moving iron core is limited by the pole piece.

[0018] Preferably, the pole piece is provided with a through hole, and the first permanent magnet is adsorbed on the pole piece.

[0019] Preferably, grooves are provided at both ends of the coil, and the first permanent magnet and the second permanent magnet are arranged in the grooves, and their positions are restricted by the coil.

[0020] Preferably, the N poles or S poles of the first permanent magnet and the second permanent magnet facing each other have the same magnetic poles.

[0021] Preferably, in the closed state, after the external force disappears, the contactor is maintained in the normally closed state under the action of the permanent magnet.

[0022] Preferably, in the disconnected state, after the external force disappears, the contactor is maintained in a normally open state under the action of the permanent magnet, and after the coil is energized, the moving iron core drives the bracket to put the contact bridge and the contact in a closed state.

[0023] The technical effects and advantages of the utility model are as follows: the contactor with the initial state of the contact can be set manually, and the initial state can be set to normally open or normally closed; the structure is reasonable, and the same product can be set to normally open or normally closed when leaving the factory according to the needs, which expands the scope of product use and reduces the product types and inventory; the magnetic system adopts a combination of permanent magnet and electromagnetic, the coil does not heat up during long-term working, and the coil is energy-saving. At the same time, the contactor can be changed to normally closed, and the coil of the contactor is not energized in the long-term working state, not only does the coil not heat up, but it is also very energy-saving, and the coil is not easy to burn out, and the reliability is greatly improved. When switching is required, the normally closed contactor coil is energized, the contactor is disconnected, and when the circuit returns to normal, the standby emergency power supply is withdrawn, the normally closed contactor coil is powered off, the normally closed contactor returns to the normally closed state, and the common power supply resumes work; the permanent magnet is used to maintain the state of the contactor contact group, and the suction force of the permanent magnet is stable, so that the contact pressure remains stable and is not affected by power supply fluctuations, thereby improving product reliability. The permanent magnet has a large magnetic force, which can increase the contact pressure and reduce the contact contact resistance, thereby reducing the contact temperature rise and improving the contactor's current capacity. The coil adopts pulse power supply, which has obvious energy-saving effect. It can be said to be basically zero power consumption, which greatly reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the normally open state of the utility model;

[0025] Figure 2 This is a schematic diagram of the normally open state of the magnetic system of the utility model;

[0026] Figure 3 This is a schematic diagram of the normally closed state of the utility model;

[0027] Figure 4 This is a schematic diagram of the normally closed state of the magnetic system of the utility model;

[0028] Figure 5 This is the circuit diagram of the utility model.

[0029] In the figure: 1. contact spring; 2. contact; 3. bracket; 4. moving iron core; 5. first permanent magnet; 6. second permanent magnet; 7. lower shell; 8. contact bridge; 9. upper shell; 10. pole piece; 11. coil; 12. magnetic conductor. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The utility model provides Figure 1 A contactor capable of setting the initial state of a contact as shown in the figure comprises an upper shell 9, a contact 2 arranged on the upper shell 9, a bracket 3 arranged in the upper shell 9, a contact bridge 8 arranged on the bracket 3, a contact spring 1 installed between the bracket 3 and the contact bridge 8, the upper shell 9 is connected to the lower shell 7 by screws, a magnetic conductor 12 arranged in the lower shell 7, a coil 11 arranged in the magnetic conductor 12, a moving iron core 4 arranged in the coil 11, a first permanent magnet 5 arranged on the coil 11, a pole piece 10 is arranged on the first permanent magnet 5, the moving iron core 4 passes through the pole piece 10 and is connected to the bracket 3; a second permanent magnet 6 is arranged under the coil 11, and the second permanent magnet 6 is adsorbed on the bottom of the magnetic conductor 12;

[0032] The moving iron core 4 is cylindrical, with one end having a large diameter and the other end having a small diameter; the first permanent magnet 5 is annular, and the end with a small diameter of the moving iron core 4 passes through the first permanent magnet 5, and the travel of the moving iron core 4 is limited by the pole piece 10; the moving iron core 4 can move up and down in the cavity of the coil 11 under the action of an external force;

[0033] The contactor can be manually set to two states initially. State 1: external force is used to push the bracket 3 to drive the moving iron core 4 to move downward, and the contact bridge 8 and the contact 2 are in a closed state. After the external force disappears, the contactor is maintained in a normally closed state under the action of the permanent magnet; Figure 3 , Figure 4 As shown;

[0034] State 2: Use external force to push the bracket 3 to drive the moving iron core 4 to move upward, the contact bridge 8 and the contact 2 are in the disconnected state, and after the external force disappears, the contactor is maintained in the normally open state under the action of the permanent magnet; Figure 1 , Figure 2 As shown;

[0035] After the coil 11 is energized, the moving iron core 4 moves, and the above state is reversed;

[0036] A through hole is formed on the pole piece 10, and the first permanent magnet 5 is adsorbed on the pole piece 10;

[0037] There are grooves at both ends of the coil 11. The first permanent magnet 5 and the second permanent magnet 6 are in the grooves of the coil 11. Their positions are restricted by the coil 11 and cannot move.

[0038] When the first permanent magnet 5 and the second permanent magnet 6 are assembled, the two poles facing each other on the inner side are the same, and the two poles on the outer side are the same. Figure 2 The I pole can be either the N pole or the S pole, and similarly, the II pole can be either the N pole or the S pole;

[0039] The coil 11 is installed in the magnetic conductor 12, and the magnetic conductor 12 is made of common metal materials in the prior art; a through hole is provided in the center of the coil 11;

[0040] The moving iron core 4 is arranged in the through hole of the coil 11, and the moving iron core 4 passes through the upper part of the through hole of the coil 11 and then passes through the pole piece 10 to be connected with the bracket 3. A contact bridge 8 is arranged on the bracket 3, and a contact spring 1 is arranged between the contact bridge 8 and the bracket 3. When the contactor is in the normally open state, the moving iron core 4 generates electromagnetic attraction during operation when a positive pulse voltage is applied to the coil 11, and the moving iron core 4 moves toward the second permanent magnet 6, driving the bracket 3 to move downward, and the contactor is closed; when a reverse pulse voltage is applied to the coil 11, the moving iron core 4 generates electromagnetic attraction, and the moving iron core 4 moves toward the first permanent magnet 5, driving the bracket 3 to move upward, and the contactor is disconnected, so the moving iron core 4 can slide up and down along the through hole in the coil 11; Figure 5 As shown, A1 and A2 are two terminals of the coil 11, connected to the control power supply;

[0041] The upper shell 9 is connected to the lower shell 7 by screws, and the remaining parts are all arranged in the upper shell 9 and the lower shell 7. The upper shell 9 is equipped with contacts 2, and the contacts 2 and the contact bridge 8 constitute a contact group. The contact spring 1 ensures the pressure after the contact group is connected, making the contact more reliable.

[0042] Working principle: Set the initial state of the contactor to normally open, such as Figure 1 , Figure 2 As shown;

[0043] When the positive pulse power supply is turned on, the coil 11 is powered on, and the moving iron core 4 generates electromagnetic attraction, and the moving iron core 4 moves toward the second permanent magnet 6, driving the bracket 3 to move downward and move in the opposite direction of the initial state, so that the state of the contact group is reversed, thereby controlling the load; at this time, the pulse of the positive pulse power supply disappears, the coil loses power, and under the magnetic force of the permanent magnet, the moving iron core 4 is adsorbed on the magnetic conductor 12, maintaining the contactor in a state opposite to the initial state, and in a closed state;

[0044] When the negative pulse power supply is turned on, the coil 11 is energized again, and the moving iron core 4 generates an electromagnetic attraction opposite to the positive pulse, and the moving iron core 4 moves toward the first permanent magnet 5; because the moving iron core 4 is connected to the bracket 3, the movement of the moving iron core 4 will drive the bracket 3 to follow the movement of the moving iron core 4; while the bracket 3 follows the movement of the moving iron core 4, it also drives the contact bridge 8 to move in the same direction as the initial state, so that the state of the contact group is reversed again, thereby stopping the control of the load; at this time, the pulse of the negative pulse power supply disappears, the coil loses power, and under the magnetic force of the first permanent magnet 5, the moving iron core 4 is adsorbed on the pole piece 10, maintaining the initial state of the contactor unchanged;

[0045] Set the initial state of the contactor to normally closed, such as Figure 3 , Figure 4 As shown;

[0046] When the positive pulse power supply is turned on, the coil 11 is powered on, and the moving iron core 4 generates electromagnetic attraction, and the moving iron core 4 moves toward the first permanent magnet 5, driving the bracket 3 to move upward and move in the opposite direction of the initial state, so that the state of the contact group is reversed, thereby controlling the load. At this time, the pulse of the positive pulse power supply disappears, the coil loses power, and under the magnetic force of the permanent magnet, the moving iron core 4 is adsorbed on the pole piece 10, maintaining the contactor in a state opposite to the initial state, and is in a disconnected state;

[0047] When the negative pulse power supply is turned on, the coil 11 is energized again, and the moving iron core 4 generates an electromagnetic attraction opposite to the positive pulse, and the moving iron core 4 moves toward the second permanent magnet 6; because the moving iron core 4 is connected to the bracket 3, the movement of the moving iron core 4 will drive the bracket 3 to follow the movement of the moving iron core 4; while the bracket 3 follows the movement of the moving iron core 4, it also drives the contact bridge 8 to move in the same direction as the initial state, so that the state of the contact group is reversed again, thereby stopping the control of the load. At this time, the pulse of the negative pulse power supply disappears, the coil loses power, and under the magnetic force of the second permanent magnet 6, the moving iron core 4 is adsorbed on the magnetic conductor 12, maintaining the initial state of the contactor unchanged;

[0048] The coil 11 adopts pulse power supply, which has obvious energy-saving effect, and can be said to be basically zero power consumption, which greatly reduces the use cost.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A contactor capable of setting the initial state of a contact, characterized in that: include: A magnetic conductor (12); A coil (11) disposed in a magnetic conductor (12); A first permanent magnet (5) arranged at one end of the coil (11); A pole piece (10) disposed on the first permanent magnet (5); A second permanent magnet (6) disposed at the other end of the coil (11); A moving iron core (4) disposed inside the coil (11); A bracket (3) connected to the moving iron core (4); A contact bridge (8) connected to the bracket (3); A contact (2) that cooperates with the contact bridge (8).

2. A contactor capable of setting the initial state of contacts according to claim 1, characterized in that: When the bracket (3) is pushed by an external force, the contact bridge (8) and the contact (2) are in a closed state.

3. A contactor capable of setting the initial state of contacts according to claim 1, characterized in that: When the bracket (3) is pushed by an external force, the contact bridge (8) and the contact (2) are in a disconnected state.

4. The contactor capable of setting the initial state of the contact according to any one of claims 1, 2 or 3, characterized in that: A contact spring (1) is provided between the bracket (3) and the contact bridge (8).

5. A contactor capable of setting the initial state of contacts according to claim 1, characterized in that: The moving iron core (4) passes through the pole piece (10) and is connected to the bracket (3), and the travel of the moving iron core (4) is limited by the pole piece (10).

6. The contactor capable of setting the initial state of the contacts according to claim 1 or 5, characterized in that: The pole piece (10) is provided with a through hole, and the first permanent magnet (5) is adsorbed on the pole piece (10).

7. A contactor capable of setting the initial state of contacts according to claim 1, characterized in that: The coil (11) has grooves at both ends, and the first permanent magnet (5) and the second permanent magnet (6) are arranged in the grooves, with their positions restricted by the coil (11).

8. The contactor capable of setting the initial state of the contacts according to any one of claims 1 or 7, characterized in that: The N poles or S poles of the first permanent magnet (5) and the second permanent magnet (6) facing each other are identical in magnetic poles.

9. A contactor capable of setting the initial state of contacts according to claim 2, characterized in that: In the closed state, when the external force disappears, the contactor is maintained in the normally closed state under the action of the permanent magnet.

10. A contactor capable of setting the initial state of contacts according to claim 3, characterized in that: In the disconnected state, when the external force disappears, the contactor is maintained in a normally open state under the action of the permanent magnet, and when the coil (11) is energized, the moving iron core (4) drives the bracket (3) to place the contact bridge (8) and the contact (2) in a closed state.

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