Electromagnetic release and circuit breaker

Abstract

The electromagnetic release comprises a magnet yoke, a permanent magnet, an iron core, a magnetic conductive end cover, a coil framework and a coil, and further comprises a counter-force spring which is connected between the iron core and a button. When the electromagnetic release is in an opening state, the iron core overcomes the counter-acting force of the counter-force spring under the action of opening driving force to be attracted with the magnetic conductive end cover, and the iron core drives the contact mechanism to be opened and provides opening holding force for the contact mechanism. The circuit breaker comprises a button, a control system and a contact mechanism, and further comprises an electromagnetic release, and the button drives the control system to supply forward voltage to a coil and provide closing driving force for an iron core; the control system supplies reverse voltage to the coil and provides opening driving force for the iron core. According to the electromagnetic release and the circuit breaker, the counter-force spring is arranged between the iron core and the button for providing the closing driving force for the iron core, so that the holding force of the electromagnetic release in an opening state is reduced, and the power required by the circuit breaker during closing can be reduced; in addition, the counter-force spring further provides reset force for the button.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to an electromagnetic release and a circuit breaker. Background Art

[0002] Most existing bidirectional attracting electromagnetic releases are used in circuit breakers. Since there is a final pressure between the moving and static contacts when the circuit breaker is in the closed (switch-on) state, the attracting forces during switch-on and switch-off are inconsistent, and the switch-on force is greater than the switch-off force. As a result, when an operator manually switches on the circuit breaker, a greater switch-on force is required; at the same time, the power required for automatic switch-on of the circuit breaker is greater than that required for switch-off. Content of the Utility Model

[0003] The purpose of the utility model is to overcome at least one defect of the prior art, and to provide an electromagnetic release and a circuit breaker.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The electromagnetic release includes a yoke, a permanent magnet, an iron core, a magnetic conductive end cover, a coil bobbin and a coil sleeved on the coil bobbin. The yoke has an attracting side wall opposite to the magnetic conductive end cover. The permanent magnet is located between the magnetic conductive end cover and the attracting side wall. The iron core is movably arranged in the axial hole of the coil bobbin and is located between the magnetic conductive end cover and the attracting side wall. The iron core is in driving cooperation with the contact mechanism, and further includes a reaction spring. The reaction spring is connected between the iron core and a button that provides a switch-on driving force for the iron core.

[0006] When the electromagnetic release is in the switch-off state, the iron core is attracted to the magnetic conductive end cover under the action of the switch-off driving force, overcoming the reaction force of the reaction spring. The iron core drives the contact mechanism to switch off and provides a switch-off holding force for the contact mechanism.

[0007] Optionally, the reaction force of the reaction spring is less than the switch-off holding force, and the direction of the reaction force of the reaction spring is opposite to the direction of the switch-off holding force.

[0008] Optionally, the yoke is of a U-shaped structure. The magnetic conductive end cover covers and is fixed on the opening of the yoke, and an accommodating cavity is formed between the magnetic conductive end cover and the yoke. The permanent magnet is sleeved on the outer side of the coil bobbin. The iron core is slidably arranged in the axial hole of the coil bobbin. The coil bobbin is installed in the accommodating cavity and is located between the magnetic conductive end cover and the attracting side wall.

[0009] Optionally, the coil includes a first coil and a second coil respectively wound on the coil bobbin. The first coil and the second coil are wound in the same direction, and the first coil and the second coil are connected in parallel. The permanent magnet is located between the first coil and the second coil.

[0010] Optionally, a first push rod is provided at one end of the iron core for attracting with the magnetic conductive end cover. One end of the first push rod passes through a first through hole in the magnetic conductive end cover and is fixedly connected to the iron core.

[0011] Optionally, a limiting groove is provided at one end of the iron core for attracting with the magnetic conductive end cover; one end of the reaction spring is connected to the button, and the other end of the reaction spring passes through the first through hole in the magnetic conductive end cover and is connected in a limited way in the limiting groove of the iron core.

[0012] Optionally, the reaction spring is sleeved on the first push rod at one end of the iron core for attracting with the magnetic conductive end cover.

[0013] Optionally, the permanent magnet is located at the central position between the magnetic conductive end cover and the attracting side wall, and the axially lengths of the first coil and the second coil are the same.

[0014] Optionally, the iron core is in driving cooperation with the contact mechanism through a second push rod. One end of the second push rod passes through a second through hole in the attracting side wall and is fixedly connected to one end of the iron core for attracting with the attracting side wall, and the other end of the second push rod is used for driving cooperation with the contact mechanism.

[0015] A circuit breaker includes a button, a control system and a contact mechanism, and also includes any one of the electromagnetic release devices. The button drives the control system to apply a positive voltage to the coil of the electromagnetic release device to provide a closing driving force for the iron core of the electromagnetic release device; the control system applies a reverse voltage to the coil of the electromagnetic release device to provide a tripping driving force for the iron core of the electromagnetic release device.

[0016] Optionally, the contact mechanism includes a contact support, a moving contact and a contact spring for providing contact pressure to the moving contact. The iron core of the electromagnetic release device is in driving cooperation with the contact support of the contact mechanism. One end of the moving contact is rotatably installed on the contact support through a rotating shaft, and the other end of the moving contact is in cooperation with a static contact.

[0017] Optionally, the iron core is in driving cooperation with the contact support of the contact mechanism through a second push rod. The second push rod is fixedly connected to a connecting rod, and the connecting rod is hinged to the contact support through a hinge shaft.

[0018] Optionally, the contact spring is a torsion spring. The contact spring is sleeved on the rotating shaft. One end of the contact spring abuts against the contact support, and the other end of the contact spring abuts against the moving contact.

[0019] For the electromagnetic release device and the circuit breaker of the present utility model, by arranging a reaction spring between the iron core and the button for providing a closing driving force for the iron core, the holding force in the tripping state of the electromagnetic release device is reduced, that is, the power required for closing the circuit breaker can be reduced; moreover, the reaction spring not only weakens the tripping holding force, but also provides a reset force for the button.

[0020] In addition, due to the reaction force of the contact spring, the closing holding force is weakened, so that the opening driving force and the closing driving force of the circuit breaker are almost the same, and the opening power and the closing power can be made almost the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural view of the circuit breaker in the opening state of the present utility model;

[0022] Figure 2 is a cross-sectional view of the circuit breaker in the opening state of the present utility model;

[0023] Figure 3 is a schematic structural view of the circuit breaker in the closing state of the present utility model;

[0024] Figure 4 is a cross-sectional view of the circuit breaker in the closing state of the present utility model;

[0025] Figure 5 is a schematic structural view of the electromagnetic release of the present utility model;

[0026] <F Figure 6 is a cross-sectional view of the electromagnetic release of the present utility model;

[0027] Figure 7 is a schematic structural view of the electromagnetic release of the present utility model with the coil skeleton and the coil removed;

[0028] Figure 8 is a schematic structural view of the coil skeleton, the coil and the permanent magnet of the present utility model;

[0029] Figure 9 is an exploded view of the contact mechanism of the present utility model;

[0030] Figure 10 is an assembly view of the contact mechanism of the present utility model.

[0031] Electromagnetic release 1; yoke 11; attracting side wall 111; accommodating cavity 112; permanent magnet 12; iron core 13; limiting groove 131; magnetic conductive end cover 14; coil skeleton 15; coil 16; first coil 16a; second coil 16b; reaction spring 17; first push rod 18; second push rod 19; button 2; contact mechanism 3; contact support 31; moving contact 32; static contact 33; contact spring 34; rotating shaft 35; connecting rod 36; hinge shaft 37; circuit board 4; micro switch 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following embodiments given in conjunction with the drawings further illustrate the specific embodiments of the electromagnetic release and the circuit breaker of the present utility model. The electromagnetic release and the circuit breaker of the present utility model are not limited to the descriptions of the following embodiments.

[0033] As Figure 1 shown, the circuit breaker of this embodiment includes a button 2, a control system, a contact mechanism 3, and an electromagnetic release 1. The structure and principle of the control system are prior art. The control system generally includes a circuit board 4 and a micro switch 5 connected to the circuit board 4 and trigger - cooperated with the button 2.

[0034] As Figures 1 - 4 shown, the electromagnetic release 1 of this embodiment includes a yoke 11, a permanent magnet 12, an iron core 13, a magnetic - conductive end cover 14, a coil bobbin 15, and a coil 16 sleeved on the coil bobbin 15. The yoke 11 has an attracting side wall 111 opposite to the magnetic - conductive end cover 14. The permanent magnet 12 is located between the magnetic - conductive end cover 14 and the attracting side wall 111. The iron core 13 is movably arranged in the axial hole of the coil bobbin 15 and is located between the magnetic - conductive end cover 14 and the attracting side wall 111. The iron core 13 is drivingly cooperated with the contact mechanism 3. In particular, the electromagnetic release 1 further includes a counter - force spring 17, and the counter - force spring 17 is connected between the iron core 13 and the button 2 that provides the closing driving force for the iron core 13. The button 2 overcomes the elastic force of the counter - force spring 17 to drive the circuit board 4 of the control system to supply a positive voltage to the coil 16, providing a closing driving force for the iron core 13. At this time, the electromagnetic release 1 is in the closing state, and the iron core 13 is attracted to the attracting side wall 111 of the yoke 11 under the action of the closing driving force, so that the iron core 13 drives the contact mechanism 3 to close and provides a closing holding force for the contact mechanism 3. The circuit board 4 of the control system supplies a reverse voltage to the coil 16, providing a tripping driving force for the iron core 13. At this time, the electromagnetic release 1 is in the tripping state, and the iron core 13 overcomes the reaction force of the counter - force spring 17 and is attracted to the magnetic - conductive end cover 14 under the action of the tripping driving force, so that the iron core 13 drives the contact mechanism 3 to trip and provides a tripping holding force for the contact mechanism 3.

[0035] As Figure 1 and Figure 2As shown, when the circuit breaker trips, that is, when the electromagnetic release 1 trips, since the permanent magnet 12 forms a magnetic circuit with the magnetic yoke 11, the magnetic conductive end cover 14, the iron core 13 and the air gap, and at the same time magnetizes the magnetic yoke 11 and the magnetic conductive end cover 14. When the iron core 13 biases to the left side of the permanent magnet 12, the magnetic flux on the left side of the permanent magnet 12 is greater than the magnetic flux on the right side of the permanent magnet 12. Therefore, the iron core 13 moves closer to the tripping position (i.e., moves to the left in the figure), causing the iron core 13 to attract and combine with the magnetic conductive end cover 14 to form a tripping holding force. However, due to the existence of the reaction spring 17, the tripping holding force is relatively weakened. The force value of the reaction spring 17 should be less than the tripping driving force when the iron core 13 biases to the left side of the permanent magnet 12. For the electromagnetic release and the circuit breaker of this embodiment, by arranging a reaction spring 17 between the iron core 13 and the button 2 that provides a closing driving force for the iron core 13, the holding force in the tripping state of the electromagnetic release 1 is reduced, that is, the power required for the circuit breaker to close can be reduced. Moreover, the reaction spring 17 not only weakens the tripping holding force but also provides a reset force for the button 2.

[0036] Preferably, the reaction force of the reaction spring 17 is less than the tripping holding force, and the direction of the reaction force of the reaction spring 17 is opposite to the direction of the tripping holding force. Of course, as other embodiments, the reaction spring 17 can also be arranged obliquely. The reaction spring 17 has a component force in the opposite direction of the tripping holding force, and this component force is less than the tripping holding force.

[0037] As Figures 5 - 8 shown, the magnetic yoke 11 is of a U-shaped structure. The magnetic conductive end cover 14 covers and is fixed on the opening of the magnetic yoke 11 and forms an accommodation cavity 112 with the magnetic yoke 11. The permanent magnet 12 is sleeved on the outside of the coil bobbin 15. The iron core 13 is slidably arranged in the axial hole of the coil bobbin 15. The coil bobbin 15 is installed in the accommodation cavity 112 and is located between the magnetic conductive end cover 14 and the attracting side wall 111. The coil 16 includes a first coil 16a and a second coil 16b respectively wound on the coil bobbin 15. The winding directions of the first coil 16a and the second coil 16b are the same, and the first coil 16a and the second coil 16b are connected in parallel. The permanent magnet 12 is located between the first coil 16a and the second coil 16b. Preferably, the permanent magnet 12 is sleeved on the outside of the coil bobbin 15 and is located at the central position between the magnetic conductive end cover 14 and the attracting side wall 111, and the axial lengths of the first coil 16a and the second coil 16b are the same. The coil 16 of this embodiment is of a double-coil structure, which is composed of the first coil 16a and the second coil 16b with the same winding direction and connected in parallel. The magnetic flux directions generated by the first coil 16a and the second coil 16b are the same and have the same use. After the voltage direction is switched, the voltages of the first coil 16a and the second coil 16b are switched simultaneously. Of course, the coil 16 can also be of a single-coil structure.

[0038] As Figure 2 andFigure 6 As shown, for the two-way drive structure of the iron core 13 in this embodiment, a first push rod 18 is provided at one end of the iron core 13 for attracting with the magnetic conductive end cover 14. One end of the first push rod 18 passes through the first through hole on the magnetic conductive end cover 14 and is fixedly connected to the iron core 13, and the button 2 is in driving cooperation with the other end of the first push rod 18; when the circuit breaker is manually tripped, the button 2 drives the first push rod 18 to make the iron core 13 drive the contact mechanism 3 to trip. The button 2 in this embodiment can not only supply a positive voltage to the coil 16 through the circuit board 4 of the drive control system to provide a closing driving force for the iron core 13, but also provide a tripping driving force for the iron core 13 by driving the first push rod 18.

[0039] The iron core 13 is in driving cooperation with the contact mechanism 3 through a second push rod 19. One end of the second push rod 19 passes through the second through hole on the attracting side wall 111 and is fixedly connected to one end of the iron core 13 for attracting with the attracting side wall 111, and the other end of the second push rod 19 is used for driving cooperation with the contact mechanism 3.

[0040] As Figure 2 and Figure 6 shown, a limiting groove 131 is provided at one end of the iron core 13 for attracting with the magnetic conductive end cover 14; the reaction spring 17 is sleeved on the first push rod 18. One end of the reaction spring 17 is connected to the button 2, and the other end of the reaction spring 17 passes through the first through hole on the magnetic conductive end cover 14 and is limit-connected in the limiting groove 131 of the iron core 13.

[0041] As Figure 2 and Figures 9 - 10 shown, the contact mechanism 3 includes a contact support 31, a moving contact 32, and a contact spring 34 for providing a contact pressure for the moving contact 32. The iron core 13 of the electromagnetic release 1 is in driving cooperation with the contact support 31 of the contact mechanism 3 through a second push rod 19. Specifically, the second push rod 19 is fixedly connected to a connecting rod 36, and the connecting rod 36 is hinged to the contact support 31 through a hinge shaft 37. One end of the moving contact 32 is rotatably installed on the contact support 31 through a rotating shaft 35, and the other end of the moving contact 32 is matched with a static contact 33. Preferably, the contact spring 34 is a torsion spring. The contact spring 34 is sleeved on the rotating shaft 35. One end of the contact spring 34 abuts against the contact support 31, and the other end of the contact spring 34 abuts against the moving contact 32.

[0042] As Figure 3 and Figure 4As shown, when the circuit breaker is closed, that is, when the electromagnetic release 1 is closed, since the permanent magnet 12 forms a magnetic circuit with the yoke 11, the magnetic conductive end cover 14, the iron core 13 and the air gap, and at the same time magnetizes the yoke 11 and the magnetic conductive end cover 14. When the iron core 13 is biased to the right side of the permanent magnet 12, the magnetic flux on the right side of the permanent magnet 12 is greater than the magnetic flux on the left side of the permanent magnet 12. Therefore, the iron core 13 moves closer to the closing position (i.e., moves to the right in the figure), and the attracting side wall 111 of the iron core 13 and the yoke 11 are attracted to form a closing holding force. Due to the existence of the contact spring 34, the closing holding force is relatively weakened. The force value of the contact spring 34 should be less than the closing driving force when the iron core 13 is biased to the right side of the permanent magnet 12. Due to the reaction force exerted by the reaction spring 17 on the iron core 13, the opening holding force of the circuit breaker is less than the closing holding force, that is, the closing driving force is less than the opening driving force; at the same time, due to the reaction force of the contact spring 34, the closing holding force is weakened, so that the opening driving force and the closing driving force of the circuit breaker are almost the same, and the opening power and the closing power can be almost the same.

[0043] The circuit breaker of this embodiment only supports manual opening and automatic closing and opening, and does not support manual mechanical closing.

[0044] As Figure 3 and Figure 4 As shown, during the manual closing process of the circuit breaker, press the button 2 to move to the right (closing direction). At this time, the reaction spring 17 starts to store energy as the button 2 moves. When the button 2 is pressed in place and touches the micro switch 5 on the circuit board 4 (at this time, the opening holding force cannot be overcome and the electromagnetic release 1 will not act), the circuit board 4 provides a driving voltage (i.e., the forward voltage) to the coil 16 of the electromagnetic release 1. At this time, the iron core 13 of the electromagnetic release 1 moves to the right and is attracted to the attracting side wall 111 of the yoke 11. The second push rod 19 moves to the right with the iron core 13 to drive the moving contact 32 through the connecting rod 36, so that the moving contact 32 and the static contact 33 are closed, realizing the closing of the circuit breaker.

[0045] As Figure 1 and Figure 2 As shown, during the automatic opening process of the circuit breaker, the circuit board 4 of the control system receives an opening signal and provides a reverse voltage (opposite to the voltage provided during closing) to the coil 16 of the electromagnetic release 1. At this time, the iron core 13 of the electromagnetic release 1 moves to the left and is attracted to the magnetic conductive end cover 14. The second push rod 19 moves to the left with the iron core 13 to drive the moving contact 32 through the connecting rod 36, so that the moving contact 32 and the static contact 33 are disconnected, realizing the opening of the circuit breaker; when the circuit breaker is in the open state and no external force is applied to the button 2, the reaction spring 17 releases energy to reset the button 2. The automatic closing process of the circuit breaker is the same as the automatic opening process, but the action is opposite.

[0046] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which it is usually placed during use. It is only for the convenience of description and does not indicate that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating relative importance.

[0047] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model pertains, without departing from the concept of the present utility model, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present utility model.

Claims

1. An electromagnetic release, comprising a magnetic yoke (11), a permanent magnet (12), an iron core (13), a magnetic end cover (14), a coil frame (15), and a coil (16) sleeved on the coil frame (15), wherein the magnetic yoke (11) has an attraction side wall (111) opposite to the magnetic end cover (14), the permanent magnet (12) is located between the magnetic end cover (14) and the attraction side wall (111), the iron core (13) is movably arranged in an axial hole of the coil frame (15) and is located between the magnetic end cover (14) and the attraction side wall (111), the iron core (13) is driven and matched with a contact mechanism (3), and is characterized in that: It also includes a reaction spring (17), wherein the reaction spring (17) is connected between the iron core (13) and a button (2) that provides a closing driving force for the iron core (13); When the electromagnetic release (1) is in an opening state, the iron core (13) overcomes the reaction force of the reaction spring (17) under the action of the opening driving force and is attracted to the magnetic end cover (14). The iron core (13) drives the contact mechanism (3) to open and provides an opening holding force for the contact mechanism (3).

2. The electromagnetic release according to claim 1, characterized in that: The reaction force of the reaction spring (17) is smaller than the opening retaining force, and the direction of the reaction force of the reaction spring (17) is opposite to the direction of the opening retaining force.

3. The electromagnetic release according to claim 1, characterized in that: The magnetic yoke (11) is a U-shaped structure. The magnetic end cover (14) covers and is fixed on the opening of the magnetic yoke (11) and forms an accommodating cavity (112) with the magnetic yoke (11). The permanent magnet (12) is sleeved on the outer side of the coil skeleton (15). The iron core (13) is slidably arranged in the axial hole of the coil skeleton (15). The coil skeleton (15) is installed in the accommodating cavity (112) and is located between the magnetic end cover (14) and the attracting side wall (111).

4. The electromagnetic release according to claim 1, characterized in that: The coil (16) comprises a first coil (16a) and a second coil (16b) respectively wound on a coil frame (15); the first coil (16a) and the second coil (16b) have the same winding direction, and the first coil (16a) and the second coil (16b) are arranged in parallel; the permanent magnet (12) is located between the first coil (16a) and the second coil (16b).

5. The electromagnetic release according to claim 1, characterized in that: A first push rod (18) is provided on one end of the iron core (13) for engaging with the magnetic end cover (14), and one end of the first push rod (18) passes through a first through hole on the magnetic end cover (14) and is fixedly connected to the iron core (13).

6. The electromagnetic release according to claim 1, characterized in that: A limiting groove (131) is provided on one end of the iron core (13) for engaging with the magnetic end cover (14); one end of the reaction spring (17) is connected to the button (2), and the other end of the reaction spring (17) passes through a first through-hole on the magnetic end cover (14) and is positionally connected in the limiting groove (131) of the iron core (13).

7. The electromagnetic release according to claim 6, characterized in that: The reaction spring (17) is sleeved on a first push rod (18) on one end of the iron core (13) for engaging with the magnetic end cover (14).

8. The electromagnetic release according to claim 4, characterized in that: The permanent magnet (12) is located in the center between the magnetic end cover (14) and the attracting side wall (111), and the first coil (16a) and the second coil (16b) have the same axial length.

9. The electromagnetic release according to claim 1, characterized in that: The iron core (13) is driven and matched with the contact mechanism (3) through a second push rod (19); one end of the second push rod (19) passes through a second through-hole on the attraction side wall (111) and is fixedly connected to the end of the iron core (13) for being attracted to the attraction side wall (111); the other end of the second push rod (19) is driven and matched with the contact mechanism (3).

10. A circuit breaker comprising a button (2), a control system and a contact mechanism (3), characterized in that: It also includes the electromagnetic release described in any one of claims 1 to 9, wherein the button (2) drives the control system to apply a forward voltage to the coil (16) of the electromagnetic release (1), thereby providing a closing driving force for the iron core (13) of the electromagnetic release (1); and the control system applies a reverse voltage to the coil (16) of the electromagnetic release (1), thereby providing an opening driving force for the iron core (13) of the electromagnetic release (1).

11. The circuit breaker according to claim 10, wherein: The contact mechanism (3) comprises a contact support (31), a moving contact (32) and a contact spring (34) for providing contact pressure for the moving contact (32); the iron core (13) of the electromagnetic release (1) is driven to cooperate with the contact support (31) of the contact mechanism (3); one end of the moving contact (32) is rotatably mounted on the contact support (31) via a rotating shaft (35); and the other end of the moving contact (32) cooperates with the static contact (33).

12. The circuit breaker according to claim 11, wherein: The iron core (13) is driven and matched with the contact support (31) of the contact mechanism (3) through a second push rod (19); the second push rod (19) is fixedly connected to a connecting rod (36); and the connecting rod (36) is hinged to the contact support (31) through a hinge shaft (37).

13. The circuit breaker according to claim 12, wherein: The contact spring (34) is a torsion spring, which is sleeved on the rotating shaft (35). One end of the contact spring (34) abuts against the contact support (31), and the other end of the contact spring (34) abuts against the moving contact (32).

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