DC contactor auxiliary mechanism

Abstract

The present invention discloses an auxiliary mechanism for a DC contactor. The DC contactor includes an arc-extinguishing chamber and a drive coil disposed outside the arc-extinguishing chamber. The auxiliary mechanism comprises a first permanent magnet elastically mounted on the outer wall of the arc-extinguishing chamber and a signal output element also mounted on the outer wall of the arc-extinguishing chamber. When the drive coil is in an unpowered or powered state, the first permanent magnet can engage or disengage the signal output element, thereby causing the signal output element to be in an on or off state, respectively. This DC contactor auxiliary mechanism has a simple, novel, and rational structure, high safety, precision, and stability during operation, and a long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of DC contactors, and in particular provides a DC contactor auxiliary mechanism. Background Art

[0002] To determine the operating status of a contactor, directly collecting on / off signals from the main contact circuit involves high voltage, which poses a significant safety risk. However, adding an auxiliary contact mechanism to the contactor avoids high-voltage detection issues and improves product safety.

[0003] Due to the sealed design of DC contactors, almost all contactors on the market currently have the auxiliary contact mechanism completely sealed inside the ceramic cavity. However, this design has the following defects: ① The arc erosion products generated by the main contacts of the contactor during the opening and closing process will fall on the auxiliary contact mechanism, thereby affecting its service life; ② When the auxiliary contact mechanism is installed inside the ceramic cavity, there is a risk of arc erosion; ③ When the auxiliary contact mechanism outputs the on-off signal, it is necessary to add welding points on the outside of the ceramic shell, thereby increasing the risk of product welding leakage.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, the present invention provides a DC contactor auxiliary mechanism, which has a simple, novel and reasonable structure, high safety, accuracy and stability during operation, and a long service life.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a DC contactor auxiliary mechanism, the DC contactor includes an arc extinguishing chamber and a driving coil arranged outside the arc extinguishing chamber, the auxiliary mechanism includes a first permanent magnet elastically mounted on the outer wall of the arc extinguishing chamber and a signal output component also mounted on the outer wall of the arc extinguishing chamber, and when the driving coil is in an unpowered state or a powered state, the first permanent magnet can correspondingly contact or disconnect with the signal output component, thereby causing the signal output component to be in an on state or a disconnected state respectively.

[0007] As a further improvement of the present invention, a ceramic tube, a magnetic pole plate and a connecting ring are provided. The ceramic tube is a hollow cylindrical structure with an open bottom. The magnetic pole plate is sealed and fixedly connected to the bottom of the ceramic tube by the connecting ring. That is, the ceramic tube, the magnetic pole plate and the connecting ring together enclose the arc extinguishing chamber.

[0008] In addition, a mounting groove extending vertically and opening on the top surface of the ceramic tube is provided on the outer wall of the ceramic tube. The first permanent magnet is elastically mounted in the mounting groove. The signal output member comprises two soft copper sheets. Both of the soft copper sheets are vertically and positionally mounted in the mounting groove. At the same time, the lower ends of the two soft copper sheets are also extended below the first permanent magnet, and the upper ends of the two soft copper sheets are also extended outside the upper opening of the mounting groove to serve as signal output ends.

[0009] When the drive coil is in an unpowered state, the first permanent magnet can elastically press against the lower ends of the two soft copper sheets so that the two soft copper sheets are connected; and when the drive coil is in an energized state, the first permanent magnet can break contact with the lower ends of the two soft copper sheets so that the two soft copper sheets are disconnected.

[0010] As a further improvement of the present invention, a structure for realizing elastic installation of the first permanent magnet in the installation slot is as follows: the auxiliary mechanism also includes a mounting block, a limit block, a spring and a stop plate, wherein the mounting block is tightly fitted and embedded in the installation slot, and an installation gap for movable installation of the first permanent magnet is formed between one side of the mounting block and the inner wall of the installation slot, the limit block is tightly fitted and installed in the installation gap, and at the same time, the limit block is also arranged above the first permanent magnet, the spring is placed between the limit block and the first permanent magnet, and the upper and lower ends of the spring are respectively positioned and connected to the lower side of the limit block and the upper side of the first permanent magnet, that is, the spring provides a downward elastic force to the first permanent magnet, so that the first permanent magnet can elastically press against the lower ends of the two soft copper sheets when the driving coil is in an unpowered state; the stop plate is positioned and installed at the upper opening of the installation slot to stop and limit the mounting block and the limit block;

[0011] The structure for achieving vertical and positional installation of the two soft copper sheets in the installation slots is as follows: two slots extending vertically are provided on the installation block, and the two soft copper sheets are correspondingly inserted into the two slots.

[0012] As a further improvement of the present invention, the two soft copper sheets each have a copper sheet A arranged vertically and in an inverted L shape and a copper sheet B arranged horizontally and in an L shape, wherein the two copper sheets A are respectively inserted into the two slots, and the upper sides of the two copper sheets A also extend out of the upper opening of the mounting slot to serve as signal output ends; one end of the two copper sheets B is respectively and integrally connected to the bottom ends of the two copper sheets A, and the other ends of the two copper sheets B are both extended and placed below the first permanent magnet, and when the drive coil is in an unpowered state, the other ends of the two copper sheets B are respectively in contact with the first permanent magnet.

[0013] As a further improvement of the present invention, a structure for achieving the disconnection of the first permanent magnet from the lower ends of the two soft copper sheets is as follows: the DC contactor further includes a moving iron core movably arranged in the space surrounded by the drive coil and a push rod arranged vertically, the lower end of the push rod tightly fittingly inserted into the moving iron core, and the upper end of the push rod movably inserted into the arc extinguishing cavity; the auxiliary mechanism further includes a second permanent magnet, the second permanent magnet being built into the arc extinguishing cavity and simultaneously positioned and connected to the upper end of the push rod, the second permanent magnet being arranged opposite to the first permanent magnet, and the polarity of the second permanent magnet on the two opposite sides of the first permanent magnet being the same;

[0014] In this way, when the driving coil is in the energized state, the second permanent magnet can move upward together with the push rod. At this time, the first permanent magnet can elastically move upward under the action of the repulsive force generated between it and the second permanent magnet, so that it breaks contact with the lower ends of the two soft copper sheets.

[0015] As a further improvement of the present invention, the structure for realizing the positioning connection between the second permanent magnet and the upper end of the push rod is: the auxiliary mechanism also includes a connecting block made of plastic material and fixedly connected to the upper end of the push rod, and the second permanent magnet is positioned and embedded in the connecting block.

[0016] The beneficial effects of the present invention are: on the one hand, the auxiliary mechanism of the DC contactor can accurately determine the on and off states of the contact mechanism, greatly improving the stability of the DC contactor during operation; on the other hand, most of the components of the auxiliary mechanism are installed outside the arc extinguishing chamber, thereby effectively reducing the adverse effects of the electric arc on the auxiliary mechanism, which not only improves the safety, accuracy and stability of the auxiliary mechanism during operation, but also extends the service life of the auxiliary mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial three-dimensional structural diagram of a DC contactor equipped with the auxiliary mechanism of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the top view of the DC contactor shown;

[0019] Figure 3 for Figure 2 AA cross-sectional structural diagram shown;

[0020] Figure 4 This is a schematic diagram of the working state of the auxiliary mechanism of the present invention when the driving coil is in a non-energized state;

[0021] Figure 5 This is a schematic diagram of the working state of the auxiliary mechanism of the present invention when the driving coil is in an energized state;

[0022] Figure 6 This is a schematic structural diagram of the soft copper sheet of the present invention.

[0023] The following description is made with reference to the accompanying drawings:

[0024] 1—arc-extinguishing chamber; 10—ceramic tube; 11—pole plate; 12—connecting ring; 20—first permanent magnet; 21—signal output element; 210—copper sheet A; 211—copper sheet B; 22—mounting block; 23—limiting block; 24—spring; 25—second permanent magnet; 26—connecting block; 3—moving iron core; 4—push rod. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0026] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are intended solely to facilitate understanding and reading by those skilled in the art, and are not intended to limit the applicable conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, should still fall within the scope of the technical content disclosed by the present invention. The terms "first," "second," "A," "B," etc., used in this specification are intended solely for ease of description and are not intended to limit the applicable scope of the present invention.

[0027] Example 1:

[0028] Please see the attached Figure 1 To the attached Figure 3 The figures are respectively a partial three-dimensional structural diagram, a top structural diagram and an AA cross-sectional structural diagram of a DC contactor equipped with the auxiliary mechanism of the present invention.

[0029] The present invention provides an auxiliary mechanism for a DC contactor, which includes an arc extinguishing chamber 1 and a driving coil arranged outside the arc extinguishing chamber 1. The auxiliary mechanism includes a first permanent magnet 20 elastically mounted on the outer wall of the arc extinguishing chamber 1 and a signal output element 21 also mounted on the outer wall of the arc extinguishing chamber 1. When the driving coil is in an unpowered state or a powered state, the first permanent magnet 20 can correspondingly contact or disconnect with the signal output element 21, thereby causing the signal output element 21 to be in an on state or a off state respectively. The working state of the DC contactor can be determined by the working state of the signal output element.

[0030] In this embodiment, preferably, a ceramic tube 10, a magnetic pole plate 11 and a connecting ring 12 are provided. The ceramic tube 10 is a hollow cylindrical structure with an open bottom. The magnetic pole plate 11 is sealed and fixedly connected to the bottom of the ceramic tube 10 by the connecting ring 12. That is, the ceramic tube 10, the magnetic pole plate 11 and the connecting ring 12 together enclose the arc extinguishing chamber 1; the driving coil is positioned below the arc extinguishing chamber 1;

[0031] In addition, a mounting groove extending vertically and opening on the top surface of the ceramic tube 10 is provided on the outer wall thereof. The first permanent magnet 20 is elastically mounted in the mounting groove. The signal output member 21 comprises two soft copper sheets. Both of the soft copper sheets are vertically and positionally mounted in the mounting groove. At the same time, the lower ends of the two soft copper sheets are also extended below the first permanent magnet 20, and the upper ends of the two soft copper sheets are also extended outside the upper opening of the mounting groove to serve as signal output ends.

[0032] When the driving coil is in an unpowered state, the first permanent magnet 20 can elastically press against the lower ends of the two soft copper sheets so that the two soft copper sheets are connected (see attached diagram). Figure 4 When the driving coil is energized, the first permanent magnet 20 can be disconnected from the lower ends of the two soft copper sheets (see attached). Figure 5 As shown), so that the two soft copper sheets are disconnected, that is, the signal output component is in a disconnected state.

[0033] Further preferably, the structure for realizing the elastic installation of the first permanent magnet 20 in the installation groove is as follows: the auxiliary mechanism also includes a mounting block 22, a limit block 23, a spring 24 and a stop piece (not shown in the figure), wherein the mounting block 22, the limit block 23 and the stop piece are all made of plastic material, the mounting block 22 is tightly fitted and embedded in the installation groove, and an installation gap for the movable installation of the first permanent magnet 20 is formed between one side of the mounting block 22 and the inner wall of the installation groove, the limit block 23 is tightly fitted and installed in the installation gap, and at the same time the limit block 23 is also arranged The spring 24 is placed above the first permanent magnet 20, and is placed between the limit block 23 and the first permanent magnet 20. The upper and lower ends of the spring 24 are also positioned and connected to the lower side of the limit block 23 and the upper side of the first permanent magnet 20 respectively, that is, the spring 24 provides a downward elastic force to the first permanent magnet 20, so that the first permanent magnet 20 can elastically press against the lower ends of the two soft copper sheets when the drive coil is in an unpowered state; the stopper is positioned and installed at the upper opening of the mounting groove to stop and limit the mounting block 22 and the limit block 23;

[0034] The structure for achieving vertical and positional installation of the two soft copper sheets in the installation slots is as follows: two slots extending vertically are provided on the installation block 22 , and the two soft copper sheets are correspondingly inserted into the two slots.

[0035] Further preferably, the two soft copper sheets each have a copper sheet A210 arranged vertically and in an inverted L shape and a copper sheet B211 arranged horizontally and in an L shape (for details, see the attached Figure 6 As shown), the two copper sheets A210 are respectively inserted into the two slots, and the upper sides of the two copper sheets A210 are also extended out of the upper opening of the installation slot to serve as signal output ends; one end of the two copper sheets B211 is respectively connected to the bottom ends of the two copper sheets A210 as a whole, and the other ends of the two copper sheets B211 are extended below the first permanent magnet 20, and when the drive coil is in an unpowered state, the other ends of the two copper sheets B211 are respectively in contact with the first permanent magnet 20.

[0036] Further preferably, the structure for achieving the disconnection of the first permanent magnet 20 from the lower ends of the two soft copper sheets is as follows: the DC contactor further comprises a moving iron core 3 movably arranged in the space surrounded by the drive coil and a push rod 4 arranged vertically, the lower end of the push rod 4 is tightly fitted and inserted into the moving iron core 3, and the upper end of the push rod 4 is movably inserted into the arc extinguishing chamber 1; the auxiliary mechanism further comprises a second permanent magnet 25, the second permanent magnet 25 is built into the arc extinguishing chamber 1, and is positioned and connected to the upper end of the push rod 4 at the same time, the second permanent magnet 25 is also arranged opposite to the first permanent magnet 20, and the polarity of the two opposite sides of the second permanent magnet 25 and the first permanent magnet 20 is the same, that is, the polarity of the upper side of the second permanent magnet 25 is the same as the polarity of the lower side of the first permanent magnet 20;

[0037] In this way, when the driving coil is in the energized state, the second permanent magnet 25 can move upward together with the push rod 4. At that time, the first permanent magnet 20 can elastically move upward under the action of the repulsive force generated between it and the second permanent magnet 25, so that it is disconnected from the lower ends of the two soft copper sheets.

[0038] More preferably, the structure for realizing the positioning connection between the second permanent magnet 25 and the upper end of the push rod 4 is as follows: the auxiliary mechanism also includes a connecting block 26 made of plastic material and fixedly connected to the upper end of the push rod 4 through an injection molding process, and the second permanent magnet 25 is positioned and embedded in the connecting block 26.

[0039] In summary, the working principle of the auxiliary mechanism of the present invention is as follows: when the drive coil is in an unpowered state, the push rod 4 does not move, and the first permanent magnet 20 is pressed against the lower ends of the two soft copper sheets under the elastic force of the spring 24, thereby making the signal output component 21 in a conductive state; and when the drive coil is in an energized state, the push rod 4 starts to move upward, and the second permanent magnet 25 moves upward with it. Accordingly, a repulsive force is generated between the second permanent magnet 25 and the first permanent magnet 20, and the first permanent magnet 20 can overcome the elastic force of the spring 24 under the action of the repulsive force and realize elastic upward movement. Therefore, the first permanent magnet 20 is disconnected from the lower ends of the two soft copper sheets, and the signal output component 21 is in a disconnected state.

[0040] In summary, on the one hand, the auxiliary mechanism of the present invention can accurately determine the on and off states of the contact mechanism, greatly improving the stability of the DC contactor during operation; on the other hand, most of the components of the auxiliary mechanism are installed outside the arc extinguishing chamber, thereby effectively reducing the adverse effects of the electric arc on the auxiliary mechanism, which not only improves the safety, accuracy and stability of the auxiliary mechanism during operation, but also extends the service life of the auxiliary mechanism.

[0041] The above description is only a preferred embodiment of the present invention, but is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A DC contactor auxiliary mechanism, comprising an arc extinguishing chamber (1) and a drive coil arranged outside the arc extinguishing chamber (1), characterized in that: The auxiliary mechanism comprises a first permanent magnet (20) elastically mounted on the outer wall of the arc extinguishing chamber (1) and a signal output element (21) also mounted on the outer wall of the arc extinguishing chamber (1), and when the driving coil is in an unpowered state or a powered state, the first permanent magnet (20) can be in contact with or disconnected from the signal output element (21) accordingly, thereby causing the signal output element (21) to be in an on state or a off state accordingly; A ceramic tube (10), a magnetic pole plate (11) and a connecting ring (12) are provided, wherein the ceramic tube (10) is a hollow cylindrical structure with an open bottom side, the magnetic pole plate (11) is sealed and fixedly connected to the bottom side of the ceramic tube (10) through the connecting ring (12), and the ceramic tube (10), the magnetic pole plate (11) and the connecting ring (12) together enclose the arc extinguishing chamber (1); a mounting groove extending vertically and opening on the top surface thereof is provided on the outer wall of the ceramic tube (10), the first permanent magnet (20) is elastically installed in the mounting groove, and the signal output component (21) has two soft copper sheets , the two soft copper sheets are both vertically and positionedly installed in the installation groove, and at the same time, the lower ends of the two soft copper sheets are both extended below the first permanent magnet (20), and the upper ends of the two soft copper sheets are both extended outside the upper opening of the installation groove to serve as signal output ends; when the drive coil is in an unpowered state, the first permanent magnet (20) can elastically press on the lower ends of the two soft copper sheets so that the two soft copper sheets are connected; and when the drive coil is in an energized state, the first permanent magnet (20) can disconnect from the lower ends of the two soft copper sheets so that the two soft copper sheets are disconnected; The structure for realizing elastic installation of the first permanent magnet (20) in the installation groove is as follows: the auxiliary mechanism also includes a mounting block (22), a limiting block (23), a spring (24) and a stopper, wherein the mounting block (22) is tightly fitted and embedded in the installation groove, and a mounting gap for movable installation of the first permanent magnet (20) is formed between one side of the mounting block (22) and the inner wall of the installation groove, the limiting block (23) is tightly fitted and installed in the mounting gap, and at the same time, the limiting block (23) is also arranged above the first permanent magnet (20), the spring (24) is placed between the limiting block (23) and the first permanent magnet (20), and the upper and lower ends of the spring (24) are arranged in a direction opposite to the direction of rotation of the first permanent magnet (20). The ends are also positioned and connected to the lower side of the limit block (23) and the upper side of the first permanent magnet (20), respectively. The spring (24) provides a downward elastic force to the first permanent magnet (20), so that the first permanent magnet (20) can elastically press against the lower ends of the two soft copper sheets when the drive coil is in an unpowered state; the stop sheet is positioned and installed at the upper opening of the installation groove to stop and limit the installation block (22) and the limit block (23); the structure for achieving the two soft copper sheets being vertically and positioned in the installation groove is as follows: two slots extending vertically are provided on the installation block (22), and the two soft copper sheets are respectively inserted into the two slots; The structure for realizing that the first permanent magnet (20) can disconnect from the lower ends of the two soft copper sheets is as follows: the DC contactor further comprises a moving iron core (3) movably arranged in the space surrounded by the driving coil and a push rod (4) arranged vertically, the lower end of the push rod (4) is tightly fitted and inserted into the moving iron core (3), and the upper end of the push rod (4) is movably inserted into the arc extinguishing chamber (1); the auxiliary mechanism further comprises a second permanent magnet (25), the second permanent magnet (25) is built into the arc extinguishing chamber (1) and is simultaneously connected to the push rod ( 4) The upper end is positioned and connected, the second permanent magnet (25) is also arranged opposite to the first permanent magnet (20), and the second permanent magnet (25) and the first permanent magnet (20) have the same polarity on the two opposite sides; when the driving coil is in the energized state, the second permanent magnet (25) can move upward with the push rod (4), and at that time, the first permanent magnet (20) can elastically move upward under the action of the repulsive force generated between it and the second permanent magnet (25), so that it is disconnected from the lower ends of the two soft copper sheets.

2. The DC contactor auxiliary mechanism according to claim 1, characterized in that: The two soft copper sheets each have a copper sheet A (210) arranged vertically and in an inverted L shape and a copper sheet B (211) arranged horizontally and in an L shape, wherein the two copper sheets A (210) are respectively inserted into the two slots, and the upper sides of the two copper sheets A (210) are also extended out of the upper opening of the installation slot to serve as signal output ends; one end of the two copper sheets B (211) is respectively connected to the bottom end of the two copper sheets A (210), and the other ends of the two copper sheets B (211) are extended and placed below the first permanent magnet (20), and when the drive coil is in an unpowered state, the other ends of the two copper sheets B (211) are respectively in contact with the first permanent magnet (20).

3. The DC contactor auxiliary mechanism according to claim 1, characterized in that: The structure for realizing the positioning connection between the second permanent magnet (25) and the upper end of the push rod (4) is as follows: the auxiliary mechanism also includes a connecting block (26) made of plastic material and fixedly connected to the upper end of the push rod (4), and the second permanent magnet (25) is positioned and embedded in the connecting block (26).

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