Magnetic latching structure of contactor and contactor

Abstract

The magnetic maintaining structure of the contactor comprises a magnetic conduction assembly, a coil framework and a coil sleeved on the coil framework, the coil framework is provided with an axial hole, the magnetic conduction assembly comprises a magnetic conduction shell, a magnetic conduction sheet, a movable iron core, a magnetic conduction sleeve and a permanent magnet, the coil framework is arranged on the bottom wall of a cavity of the magnetic conduction shell, the magnetic conduction sheet is arranged in the cavity and arranged on the top end face of the coil framework, and the movable iron core is arranged in the magnetic conduction shell. The permanent magnet and the flux sleeve are arranged in the axial hole of the coil framework and are sequentially stacked on the bottom wall of the cavity, the movable iron core is arranged in the top of the guide hole of the flux sleeve in a sliding mode, and the movable iron core is in driving connection with the movable contact piece through the guide rod. A contactor includes a magnetic latching structure. According to the magnetic holding structure and the contactor, the magnetic conductive shell, the magnetic conductive sheet, the movable iron core, the magnetic conductive sleeve and the permanent magnet form a magnetic loop, the structure is simple, electromagnetic holding is not needed, the magnetic conductive sleeve is arranged in the coil framework located between the magnetic conductive sheet and the bottom wall of the magnetic conductive shell, one end of the magnetic conductive sleeve is stacked with the permanent magnet, the other end of the magnetic conductive sleeve is arranged on the movable iron core in a sleeving mode, layout is compact and orderly, and installation is convenient.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to a magnetic holding structure and a contactor of a contactor. Background Art

[0002] In the prior art, the magnetic holding structure of a contactor usually adopts electromagnetic holding, but the electromagnetic holding structure has defects such as high energy consumption and high temperature rise. Moreover, the magnetic holding structure also has problems of complex structure and inconvenient installation. In addition, the magnetic holding structure also has the problem that the state of the moving iron core cannot be monitored, so it is impossible to confirm whether the contactor is abnormal and it is also impossible to energize correctly. Summary of the Invention

[0003] The purpose of the utility model is to overcome at least one defect of the prior art, and provide a magnetic holding structure and a contactor of a contactor.

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

[0005] The magnetic holding structure of a contactor includes a magnetic conduction component, a coil bobbin and a coil sleeved on the coil bobbin. The coil bobbin has an axial hole. The magnetic conduction component includes a magnetic conduction shell, a magnetic conduction sheet, a moving iron core, a magnetic conduction sleeve and a permanent magnet. The magnetic conduction shell has a cavity for cooperating with the magnetic conduction sheet. The coil bobbin is placed on the bottom wall of the cavity. The magnetic conduction sheet is loaded into the cavity and placed on the top surface of the coil bobbin. The permanent magnet and the magnetic conduction sleeve are placed in the axial hole of the coil bobbin and are sequentially stacked on the bottom wall of the cavity. The magnetic conduction sleeve is provided with a guiding hole. The moving iron core is slidably arranged in the top of the guiding hole. The moving iron core is drivingly connected with a moving contact piece through a guide rod. The bottom end of the guide rod is connected with the moving iron core, and the top end passes through a through hole on the magnetic conduction sheet for driving connection with the moving contact piece.

[0006] Optionally, the magnetic conduction sleeve is a flange-like structure. The bottom of the magnetic conduction sleeve has a circular ring-shaped second flange stacked on the permanent magnet. The permanent magnet is a circular ring structure, and its outer diameter is the same as the outer diameter of the second flange.

[0007] Optionally, the axial hole is matched with the magnetic conduction sleeve. The axial hole is a flange-like hole structure, having a large diameter at the bottom, a small diameter at the top and a limiting step at the connection of the large diameter and the small diameter. The second flange is located in the large diameter of the axial hole and is limited between the limiting step and the permanent magnet.

[0008] Optionally, a circular ring-shaped stop step is arranged in the top of the axial hole. The moving iron core is a flange-like structure. The top of the moving iron core has a circular ring-shaped first flange. The first flange is located between the stop step and the magnetic conduction sheet.

[0009] Optionally, a spring is further included. The spring is sleeved on the guide rod, with its bottom end abutted against the moving iron core and its top end passing through the perforation and abutted against the moving contact piece.

[0010] Optionally, the moving iron core is provided with a spring groove at the top and an axially penetrating linkage hole. The aperture of the spring groove is larger than that of the linkage hole. The guide rod is inserted into the linkage hole, and the bottom end of the spring is abutted against the spring groove.

[0011] A contactor includes the magnetic holding structure of the contactor according to any one of the above.

[0012] Optionally, it includes a shielding case, two static contacts arranged in the shielding case, a moving contact piece for forming two moving contacts, and at least one set of auxiliary contacts. The moving iron core is used to drive the moving contact piece to move up and down to open and close with the static contacts. The moving contact piece is connected to the top of the guide rod. An auxiliary push rod is provided on the top end surface of the guide rod. The auxiliary contacts include two auxiliary reed pieces, one of which is an auxiliary static reed piece and the other is an auxiliary moving reed piece. When the auxiliary push rod moves up and down with the moving iron core, it can drive the auxiliary moving reed piece.

[0013] Optionally, the moving contact piece is arranged at the middle position in the shielding case. The guide rod penetrates through the moving contact piece and is arranged opposite to the auxiliary push rod above the moving contact piece at an interval. The two static contacts are arranged opposite to each other above the two moving contacts at both ends of the moving contact piece. The auxiliary contacts are located at the side of the moving contact piece. The auxiliary moving reed piece and the auxiliary static reed piece are arranged in a V shape, and the contact part of the auxiliary moving reed piece is located above the auxiliary push rod.

[0014] Optionally, when the moving iron core of the magnetic holding structure is separated from the magnetic conductive sheet, a positive current is passed through the coil, and the magnetic field generated by the coil makes the moving iron core move to contact the magnetic conductive sheet; when the moving iron core contacts the magnetic conductive sheet, a reverse current is passed through the coil, and the magnetic field generated by the coil makes the moving iron core move to separate from the magnetic conductive sheet.

[0015] For the magnetic holding structure and the contactor of the contactor of the present utility model, the magnetic conductive case, the magnetic conductive sheet, the moving iron core, the magnetic conductive sleeve and the permanent magnet form a magnetic circuit. The structure is simple, without electromagnetic holding, almost no energy consumption, almost no temperature rise of the coil, improving the reliability of the contactor. Moreover, the magnetic conductive sleeve is installed in the coil skeleton located between the magnetic conductive sheet and the bottom wall of the magnetic conductive case, with one end laminated with the permanent magnet and the other end sleeved on the moving iron core, and the layout is compact and orderly, and the installation is convenient.

[0016] In addition, the design of the flange shape of the magnetic conductive sleeve increases the contact surface area between the magnetic conductive sleeve and the permanent magnet, improving the magnetic flux and magnetic field intensity.

[0017] In addition, the on / off state of the auxiliary contact is consistent with that of the main contact. The auxiliary contact is used to monitor the on / off state of the main contact to confirm whether the contactor is abnormal. Even when it is impossible to judge the state of the moving iron core through the main contact when the contactor is abnormal, the on / off of the auxiliary contact can still be used to judge the state of the moving iron core's suction / release, enabling the prediction of the movement of the moving iron core after power-on, so as to quickly confirm whether to apply a positive current or a reverse current to the coil and avoid repeated power-on operations. Description of the Drawings

[0018] Figure 1 is a cross-sectional view of one part of the contactor of the present utility model;

[0019] Figure 2 is a cross-sectional view of another part of the contactor of the present utility model;

[0020] Figure 3 is an exploded view of the magnetic conduction component of the present utility model;

[0021] Figure 4 is a cross-sectional view of the magnetic conduction component of the present utility model.

[0022] Shielding shell 1; Auxiliary reed 2; Contact part 21; Static contact 3; Moving contact piece 4; Spring 40; Magnetic conduction component 5; Magnetic conduction shell 51; Cavity 510; Magnetic conduction sheet 52; Moving iron core 53; First flange 531; Spring groove 532; Linkage hole 533; Guide rod 56; Magnetic conduction sleeve 54; Guide hole 541; Second flange 542; Permanent magnet 55; Auxiliary push rod 6; Coil skeleton 7; Axial hole 70; Limit step 701; Stop step 702; Coil 8; Coil spring piece 9; Lead wire 90. Detailed Embodiment

[0023] The following embodiments given in conjunction with the drawings further illustrate the magnetic holding structure of the contactor of the present utility model and the specific implementation manners of the contactor. The magnetic holding structure of the contactor of the present utility model and the contactor are not limited to the descriptions of the following embodiments.

[0024] As Figures 1-3As shown in the figure, the contactor of this embodiment includes a magnetic holding structure, a shielding case 1, two stationary contacts 3 disposed within the shielding case 1, a moving contact piece 4 for forming two moving contacts, and at least one set of auxiliary contacts. The shielding case 1 forms a closed space for arc extinguishing. The magnetic holding structure includes a magnetic conduction component 5, a coil bobbin 7, and a coil 8 sleeved on the coil bobbin 7. The coil bobbin 7 has an axial hole 70. The magnetic conduction component 5 includes a magnetic conduction case 51, a magnetic conduction sheet 52, a moving iron core 53, a magnetic conduction sleeve 54, and a permanent magnet 55. The moving iron core 53 is used to drive the moving contact piece 4 to move up and down to open and close with the stationary contact 3. The moving contact piece 4 is connected to the top of a guide rod 56. An auxiliary push rod 6 is provided on the top end surface of the guide rod 56. The auxiliary contacts include two auxiliary reed pieces 2. One of the auxiliary reed pieces 2 is an auxiliary stationary reed piece, and the other auxiliary reed piece 2 is an auxiliary moving reed piece. The contact portion 21 of the auxiliary moving reed piece is relatively disposed below the contact portion 21 of the auxiliary stationary reed piece. When the coil 8 is energized, the moving iron core 53 moves upward, driving the moving contact piece 4 to move upward to close with the stationary contact 3. At the same time, the auxiliary push rod 6 moves upward with the moving iron core 53, driving the contact portion 21 of the auxiliary moving reed piece to move upward to close with the contact portion 21 of the auxiliary stationary reed piece. When the coil 8 is de-energized, the moving iron core 53 moves upward, driving the moving contact piece 4 to move downward to disconnect from the stationary contact 3. At the same time, the auxiliary push rod 6 moves downward with the moving iron core 53, driving the contact portion 21 of the auxiliary moving reed piece to move downward to close with the contact portion 21 of the auxiliary stationary reed piece. The two stationary contacts 3 and the moving contact piece 4 form the load circuit of the contactor. The moving contact piece 4 moves upward to close with the two stationary contacts 3 to connect the load circuit; the moving contact piece 4 moves downward to disconnect from the two stationary contacts 3 to disconnect the load circuit.

[0025] As Figures 1-2 shown in the figure, the layout structure of the contactor of this embodiment. The moving contact piece 4 is disposed at the middle position within the shielding case 1. The guide rod 56 penetrates through the moving contact piece 4 and is spaced relatively with the auxiliary push rod 6 located above the moving contact piece 4. The two stationary contacts 3 are relatively disposed above the two moving contacts at both ends of the moving contact piece 4. The auxiliary contacts are located at the side of the moving contact piece 4. The auxiliary moving reed piece and the auxiliary stationary reed piece are arranged in a V shape, and the contact portion 21 of the auxiliary moving reed piece is located above the auxiliary push rod 6. The contactor of this embodiment has a compact structure and a reasonable layout, and has the stationary contacts 3 and the moving contact piece 4 capable of realizing power control, as well as the auxiliary contacts for realizing signal feedback.

[0026] As Figure 2As shown in the figure, in the auxiliary circuit of the contactor of this embodiment, the coil 8 and the auxiliary contacts (auxiliary moving reed and auxiliary static reed) form an auxiliary circuit (i.e., a monitoring circuit). The coil spring piece 9 on the coil bobbin 7 is electrically connected between the lead wire 90 and the lead-out end of the coil 8. The lead wire 90 is led out of the contactor for external connection. When the moving iron core 53 is separated from the magnetic conduction piece 52 (i.e., the moving iron core 53 is in the released state), a positive current passes through the coil 8. The magnetic field generated by the coil 8 causes the moving iron core 53 to move upward and contact the magnetic conduction piece 52 (i.e., the moving iron core 53 enters the attracted state). Thus, the moving iron core 53 drives the auxiliary moving reed through the auxiliary push rod 6 to make the contact part 21 of the auxiliary moving reed contact with the contact part 21 of the auxiliary static reed, realizing the connection of the auxiliary circuit. When the moving iron core 53 contacts the magnetic conduction piece 52 (i.e., the moving iron core 53 is in the attracted state), a reverse current passes through the coil 8. The magnetic field generated by the coil 8 causes the moving iron core 53 to move downward and separate from the magnetic conduction piece 52 (i.e., the moving iron core 53 enters the released state). Thus, the moving iron core 53 drives the auxiliary moving reed through the auxiliary push rod 6 to make the contact part 21 of the auxiliary moving reed disconnect from the contact part 21 of the auxiliary static reed, realizing the disconnection of the auxiliary circuit. Since the moving iron core 53 drives the moving contact piece 4 to contact the static contact 3 and at the same time drives the auxiliary moving reed of the auxiliary contact to contact the auxiliary static reed through the auxiliary push rod 6, that is, the on / off state of the auxiliary contact is consistent with the on / off state between the moving contact piece 4 and the static contact 3 (main contact). The auxiliary contact is used to monitor the on / off state of the main contact to confirm whether the contactor is abnormal. Even when the state of the moving iron core 53 cannot be judged through the main contact when the contactor is abnormal, the on / off state of the auxiliary contact can still be used to judge the attracted / released state of the moving iron core 53, and the movement of the moving iron core 53 after power-on can be predicted. Thus, it can be quickly confirmed whether to apply a positive current or a reverse current to the coil 8, avoiding repeated power-on operations. It should be noted that generally, the contactor has a control circuit that can detect the on / off state of the auxiliary contact; when there is no control circuit, the on / off state of the auxiliary contact can be tested with a multimeter.

[0027] As Figures 3-4As shown, in this embodiment, the specific structure of the magnetic conduction component 5 is such that the magnetic conduction shell 51 of the magnetic conduction component 5 has a cavity 510 that cooperates with the magnetic conduction sheet 52. The coil bobbin 7 is placed on the bottom wall of the cavity 510. The magnetic conduction sheet 52 is inserted into the cavity 510 and placed on the top surface of the coil bobbin 7. The shielding shell 1 is inserted into the cavity 510 and placed on the top surface of the magnetic conduction sheet 52. The permanent magnet 55 and the magnetic conduction sleeve 54 are placed in the axial hole 70 of the coil bobbin 7 and are stacked in sequence on the bottom wall of the cavity 510. The magnetic conduction sleeve 54 is provided with a guiding hole 541. The moving iron core 53 is slidably arranged inside the top of the guiding hole 541. The moving iron core 53 is drivingly connected to the moving contact 4 through a guide rod 56. The bottom end of the guide rod 56 is connected to the moving iron core 53, and the top end passes through a perforation on the magnetic conduction sheet 52 for driving connection with the moving contact 4. In the magnetic holding structure of this embodiment, the magnetic conduction shell 51, the magnetic conduction sheet 52, the moving iron core 53, the magnetic conduction sleeve 54, and the permanent magnet 55 form a magnetic circuit. The structure is simple, without electromagnetic holding, with almost no energy consumption, almost no temperature rise in the coil, improving the reliability of the contactor. Moreover, the magnetic conduction sleeve 54 is inserted into the coil bobbin 7 located between the magnetic conduction sheet 52 and the bottom wall of the magnetic conduction shell 51, with one end stacked with the permanent magnet 55 and the other end sleeved on the moving iron core 53, and the layout is compact and orderly, facilitating installation.

[0028] Furthermore, the magnetic conduction sleeve 54 is of a flange-like structure. The bottom of the magnetic conduction sleeve 54 has a circular ring-shaped second flange 542 stacked on the permanent magnet 55. The permanent magnet 55 is of a circular ring structure, and its outer diameter is the same as the outer diameter of the second flange 542. The flange shape design of the magnetic conduction sleeve 54 increases the contact surface area between the magnetic conduction sleeve 54 and the permanent magnet 15, improving the magnetic flux and magnetic field intensity. Specifically, the axial hole 70 cooperates with the magnetic conduction sleeve 54. The axial hole 70 is of a flange-like hole structure, having a large diameter at the bottom, a small diameter at the top, and a limiting step 701 at the connection between the large diameter and the small diameter. The second flange 542 is located inside the large diameter of the axial hole 70 and is limited between the limiting step 701 and the permanent magnet 55. The limiting step 701 of the coil bobbin 7 cooperates with the second flange 542 of the magnetic conduction sleeve 54, playing a positioning and limiting role, facilitating the rapid assembly among the coil bobbin 7, the magnetic conduction sleeve 54, and the permanent magnet 55, and also preventing the magnetic conduction sleeve 54 from shifting.

[0029] In addition, an annular stop step 702 is provided inside the top of the axial hole 70. The top end of the magnetic conduction sleeve 54 abuts against the bottom end surface of the stop step 702. The moving iron core 53 has a flange-like structure. The top of the moving iron core 53 has an annular first flange 531 for abutting and cooperating with the top end surface of the stop step 702. The first flange 531 is located between the stop step 702 and the magnetic conduction sheet 52 and is flush with the top surface of the moving iron core 53. The stop step 702 and the magnetic conduction sheet 52 cooperate with the first flange 531 of the moving iron core 53 to limit the moving stroke of the moving iron core 53. When the moving iron core 53 is in the attracted state, the top surface of the moving iron core 53 contacts the magnetic conduction sheet 52. When the moving iron core 53 is in the released state, the first flange 531 of the moving iron core 53 abuts against the stop step 702.

[0030] As Figure 2 shown, the magnetic holding structure of this embodiment further includes a spring 40. The spring 40 is sleeved on the guide rod 56. The bottom end abuts against the moving iron core 53, and the top end passes through the perforation and abuts against the moving contact piece 4. The spring 40 provides a contact pressure between the moving contact piece 4 and the static contact point 3, improving the contact reliability between the moving contact piece 4 and the static contact point 3. Specifically, the moving iron core 53 is provided with a spring groove 532 at the top and a linkage hole 533 axially penetrating. The aperture of the spring groove 532 is larger than that of the linkage hole 533. The guide rod 56 is inserted into the linkage hole 533, and the bottom end of the spring 40 abuts against the spring groove 532.

[0031] It should be noted that in the description of the present invention, 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 the usual placement during use. It is only for the convenience of description and does not indicate that the device or element referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0032] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A magnetic holding structure of a contactor, comprising a magnetic conductive component (5), a coil frame (7) and a coil (8) sleeved on the coil frame (7), wherein the coil frame (7) has an axial hole (70), characterized in that: The magnetic conductive component (5) comprises a magnetic conductive shell (51), a magnetic conductive sheet (52), a moving iron core (53), a magnetic conductive sleeve (54) and a permanent magnet (55); the magnetic conductive shell (51) has a cavity (510) matched with the magnetic conductive sheet (52); the coil skeleton (7) is placed on the bottom wall of the cavity (510); the magnetic conductive sheet (52) is inserted into the cavity (510) and placed on the top surface of the coil skeleton (7); the permanent magnet (55) and the magnetic conductive sleeve (54) are placed on the coil skeleton. The movable iron core (53) is arranged in an axial hole (70) of the frame (7) and is stacked in sequence on the bottom wall of the cavity (510); the magnetic sleeve (54) is provided with a guide hole (541); the movable iron core (53) is slidably arranged in the top of the guide hole (541); the movable iron core (53) is connected to the movable contact piece (4) by a guide rod (56); the bottom end of the guide rod (56) is connected to the movable iron core (53); the top end of the guide rod (56) passes through a through hole on the magnetic sheet (52) for connecting to the movable contact piece (4) by driving.

2. The magnetic holding structure of the contactor according to claim 1, characterized in that: The magnetic conductive sleeve (54) is a flange-shaped structure, and the bottom of the magnetic conductive sleeve (54) has a circular second flange (542) stacked on the permanent magnet (55). The permanent magnet (55) is a circular ring structure, and its outer diameter is the same as the outer diameter of the second flange (542).

3. The magnetic holding structure of the contactor according to claim 2, characterized in that: The axial hole (70) cooperates with the magnetic conductive sleeve (54); the axial hole (70) is a flange-shaped hole structure, having a large diameter at the bottom, a small diameter at the top, and a limiting step (701) at the connection between the large diameter and the small diameter; the second flange (542) is located in the large diameter of the axial hole (70) and is limited between the limiting step (701) and the permanent magnet (55).

4. The magnetic holding structure of the contactor according to claim 1, characterized in that: A circular stop step (702) is provided in the top of the axial hole (70); the moving iron core (53) is a flange-shaped structure; the top of the moving iron core (53) has a circular first flange (531); the first flange (531) is located between the stop step (702) and the magnetic conductive sheet (52).

5. The magnetic holding structure of the contactor according to claim 1, characterized in that: It also includes a spring (40), which is sleeved on the guide rod (56), with its bottom end abutting against the moving iron core (53) and its top end passing through the through hole and abutting against the moving contact piece (4).

6. The magnetic holding structure of the contactor according to claim 5, characterized in that: The movable iron core (53) is provided with a spring slot (532) located at the top and a linkage hole (533) penetrating axially, the aperture of the spring slot (532) is larger than the aperture of the linkage hole (533), the guide rod (56) is inserted into the linkage hole (533), and the bottom end of the spring (40) abuts against the spring slot (532).

7. A contactor, characterized in that: A magnetic holding structure of a contactor comprising any one of claims 1 to 6.

8. The contactor according to claim 7, characterized in that: The invention comprises a shielding shell (1), two stationary contacts (3) arranged in the shielding shell (1), a moving contact piece (4) for forming two moving contacts, and at least one group of auxiliary contacts, wherein the moving iron core (53) is used to drive the moving contact piece (4) to move up and down so as to open and close with the stationary contacts (3), the moving contact piece (4) is connected to the top of a guide rod (56), an auxiliary push rod (6) is provided on the top surface of the guide rod (56), the auxiliary contact comprises two auxiliary spring pieces (2), one of the auxiliary spring pieces (2) is an auxiliary stationary spring piece, and the other auxiliary spring piece (2) is an auxiliary moving spring piece, and the auxiliary push rod (6) can drive the auxiliary moving spring piece when it moves up and down with the moving iron core (53).

9. The contactor according to claim 8, characterized in that: The movable contact piece (4) is arranged at a middle position in the shielding shell (1); the guide rod (56) penetrates the movable contact piece (4) and is arranged opposite to an auxiliary push rod (6) located above the movable contact piece (4); the two static contacts (3) are arranged opposite to each other above the two movable contacts at both ends of the movable contact piece (4); the auxiliary contacts are located on the side of the movable contact piece (4); the auxiliary movable spring piece and the auxiliary static spring piece are arranged in a V shape, and the contact portion (21) of the auxiliary movable spring piece is located above the auxiliary push rod (6).

10. The contactor according to claim 7, characterized in that: When the moving iron core (53) of the magnetic holding structure is separated from the magnetic conductive sheet (52), a forward current is passed through the coil (8), and the magnetic field generated by the coil (8) causes the moving iron core (53) to move and contact the magnetic conductive sheet (52); when the moving iron core (53) is in contact with the magnetic conductive sheet (52), a reverse current is passed through the coil (8), and the magnetic field generated by the coil (8) causes the moving iron core (53) to move and separate from the magnetic conductive sheet (52).

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