CN111816510A - DC contactor auxiliary mechanism - Google Patents

Abstract

The invention discloses an auxiliary mechanism of a DC contactor. The DC contactor comprises an arc-extinguishing cavity and a driving coil arranged outside the arc-extinguishing cavity. The auxiliary mechanism comprises a first permanent magnet elastically installed on the outer wall of the arc-extinguishing cavity and a The signal output member is also installed on the outer wall of the arc-extinguishing chamber, and when the driving coil is in a non-energized state or an energized state, the first permanent magnet can be in contact with or disconnected from the signal output member, so that the signal output member is in a corresponding position. On state or off state. The DC contactor auxiliary mechanism has a simple, novel and reasonable structure, high safety, accuracy and stability during operation, and a long service life.

Description

DC contactor auxiliary mechanism

technical field

The invention relates to the technical field of DC contactors, and in particular provides an auxiliary mechanism of a DC contactor.

Background technique

In order to determine the working state of the contactor, if the on-off signal is directly collected from the main contact circuit, it is a high-voltage operation, and there is a greater risk in terms of safety. By adding an auxiliary contact mechanism to the contactor, the problem of high voltage detection can be avoided and the safety of the product can be improved.

Due to the sealing design of the DC contactor, almost all contactors on the market currently completely seal the auxiliary contact mechanism inside the ceramic cavity, but this design method has the following defects: 1. The main contact of the contactor is opening and closing. The arc ablation generated in the process will fall on the auxiliary contact mechanism, thus affecting its service life; ② the auxiliary contact mechanism is installed inside the ceramic cavity, there is a risk of being ablated by the arc; ③ the auxiliary contact mechanism will When the on-off signal is output, it is necessary to increase the welding point outside the ceramic shell, which increases the risk of product welding leakage.

In view of this, the present invention is proposed.

SUMMARY OF THE INVENTION

In order to overcome the above 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 long service life.

The technical solution adopted by the present invention in order to solve the technical problem is: an auxiliary mechanism of a DC contactor. The DC contactor includes an arc-extinguishing cavity and a driving coil arranged outside the arc-extinguishing cavity, and the auxiliary mechanism includes a The first permanent magnet on the outer wall of the arc-extinguishing chamber and a signal output member also installed on the outer wall of the arc-extinguishing chamber, and when the driving coil is in a non-energized state or an energized state, the first permanent magnet Correspondingly, the signal output member can be contacted or disconnected, so that the signal output member is correspondingly in an on state or an off state.

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 lower side, and the magnetic pole plate is sealed and fixedly connected to the ceramic through the connecting ring On the lower side of the tube, that is, the ceramic tube, the magnetic pole plate and the connecting ring together form the arc extinguishing cavity;

In addition, an installation groove extending vertically and opening on the top surface is provided on the outer wall of the ceramic tube, the first permanent magnet is elastically installed in the installation groove, and the signal output member has two Soft copper sheets, both of the two soft copper sheets are installed vertically and positioned in the installation grooves, and at the same time, the lower ends of the two soft copper sheets are also extended below the first permanent magnet, and the two The upper ends of each of the soft copper sheets also protrude out of the upper opening of the installation slot to serve as a signal output end;

When the driving coil is in a non-energized 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; When the coil is energized, the first permanent magnet can be disconnected from the lower ends of the two soft copper pieces, so that the two soft copper pieces are disconnected.

As a further improvement of the present invention, the structure for realizing the elastic installation of the first permanent magnet in the installation groove is as follows: the auxiliary mechanism further includes an installation block, a limit block, a spring and a stop piece, wherein the installation The block is tightly fitted into the installation groove, and an installation gap for the movable installation of the first permanent magnet is formed between one side of the installation block and the inner wall of the installation groove, and the limit block is tightly fitted. It is 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 all the The upper and lower ends of the spring are also positioned and connected to the lower side of the limit block and the upper side of the first permanent magnet respectively, that is, the spring provides a downward elastic force to the first permanent magnet, so that the first permanent magnet is A permanent magnet can elastically press against the lower ends of the two soft copper sheets when the driving coil is in an unenergized state; The installation block and the limit block perform stop and limit;

The structure in which the two soft copper sheets are both vertically and positioned in the installation slot is as follows: the mounting block is provided with two vertical slots extending respectively, and the two soft copper sheets are Correspondingly inserted into the two slots.

As a further improvement of the present invention, each of the two soft copper sheets has an inverted L-shaped copper sheet A arranged vertically and a L-shaped copper sheet B arranged laterally, wherein the two The copper sheets A are correspondingly inserted into the two slots, and the upper sides of the two copper sheets A also protrude out of the upper openings of the mounting slots to serve as signal output terminals; two One end of the copper sheet B is integrally connected with the bottom ends of the two copper sheets A, respectively, and the other ends of the two copper sheets B are both extended below the first permanent magnet, and are in the When the driving coil is in a non-energized state, the other ends of the two copper sheets B are in contact with the first permanent magnet respectively.

As a further improvement of the present invention, the structure in which the first permanent magnet can be disconnected from the lower ends of the two soft copper sheets respectively is as follows: the DC contactor further includes a movably arranged around the drive coil and surrounded by the drive coil. The movable iron core in the space and a push rod arranged vertically, the lower end of the push rod is tightly fitted and inserted into the movable iron core, and the upper end of the push rod is movably inserted into the arc extinguishing cavity; the The auxiliary mechanism further includes a second permanent magnet, the second permanent magnet is built in the arc extinguishing chamber and is positioned and connected to the upper end of the push rod at the same time, and the second permanent magnet is also connected to the first permanent magnet arranged oppositely, and the second permanent magnet and the first permanent magnet have the same polarity on the opposite sides;

In this way, when the driving coil is energized, the second permanent magnet can move upward together with the push rod, and at that time, the first permanent magnet can generate repulsion between the first permanent magnet and the second permanent magnet Under the action of force, it elastically moves upward, so that it breaks contact with the lower ends of the two soft copper sheets.

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 as follows: the auxiliary mechanism further includes a connecting block made of plastic material and fixedly connected to the upper end of the push rod , the second permanent magnet is positioned and embedded on the connecting block.

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, which greatly improves the stability of the DC contactor during operation; Most of the components of the auxiliary mechanism are installed outside the arc extinguishing chamber, so that the adverse effects of the arc on the auxiliary mechanism can be effectively reduced, which not only improves the safety, accuracy and stability of the auxiliary mechanism during operation, It also prolongs the service life of the auxiliary mechanism.

Description of drawings

Fig. 1 is the partial three-dimensional structure schematic diagram of the DC contactor installed with the auxiliary mechanism of the present invention;

Fig. 2 is a top-view structural schematic diagram of the DC contactor shown in Fig. 1;

FIG. 3 is a schematic view of the A-A cross-sectional structure shown in FIG. 2;

4 is a schematic diagram of the working state of the auxiliary mechanism according to the present invention when the driving coil is in a non-energized state;

5 is a schematic diagram of the working state of the auxiliary mechanism according to the present invention when the driving coil is in an energized state;

FIG. 6 is a schematic structural diagram of the soft copper sheet according to the present invention.

In conjunction with the accompanying drawings, the following descriptions are made:

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

Detailed ways

The embodiments of the present invention are described below through specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the art, and are not used to limit the implementation of the present invention. Restricted conditions, it does not have technical substantive significance, any structural modification, proportional relationship change or size adjustment, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the present invention. The scope of the disclosed technical content can be covered. The "first", "second", "A", "B", etc. described in this specification are only for the convenience of description, and are not used to limit the scope of the present invention.

Example 1:

Please refer to FIG. 1 to FIG. 3 , which are a partial three-dimensional structural schematic diagram, a top-view structural schematic diagram, and an A-A cross-sectional structural schematic diagram of a DC contactor installed with the auxiliary mechanism of the present invention, respectively.

The present invention provides an auxiliary mechanism for a DC contactor. The DC contactor includes an arc-extinguishing cavity 1 and a driving coil arranged outside the arc-extinguishing cavity 1 . The auxiliary mechanism includes a The first permanent magnet 20 and a signal output member 21 also installed on the outer wall of the arc-extinguishing cavity 1, and when the driving coil is in a non-energized state or an energized state, the first permanent magnet 20 can correspond to The signal output member 21 is in contact or disconnected, so that the signal output member 21 is correspondingly in an on state or a disconnected state, and the working state of the signal output member can be used to determine the DC contactor. working status.

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 lower side, and the magnetic pole plate 11 passes through the connecting ring 12 It is sealed and fixedly connected to the lower side of the ceramic tube 10 , that is, the ceramic tube 10 , the magnetic pole plate 11 and the connecting ring 12 together form the arc extinguishing cavity 1 ; the driving coil is positioned at the Below the arc extinguishing chamber 1;

In addition, an installation groove extending vertically and opening on the top surface is provided on the outer wall of the ceramic tube 10 , the first permanent magnet 20 is elastically installed in the installation groove, and the signal output member 21 There are two soft copper sheets, both of which are installed vertically and positioned in the installation groove, and at the same time the lower ends of the two soft copper sheets are also extended to the first permanent magnet 20 Below, the upper ends of the two soft copper sheets also protrude out of the upper opening of the installation slot to serve as a signal output end;

When the driving coil is in an unenergized 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 FIG. 4 ). shown), that is, the signal output member is in a conducting state; and when the driving coil is in an electrified state, the first permanent magnet 20 can be disconnected from the lower ends of the two soft copper sheets (see appendix). 5), so that the two soft copper sheets are disconnected, that is, the signal output member is in a disconnected state.

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 further includes an installation block 22, a limit block 23, a spring 24 and a stopper piece (not shown in the figure). out), wherein the mounting block 22, the limiting block 23 and the stop piece are all made of plastic material, the mounting block 22 is tightly fitted into the mounting groove, and the mounting There is also an installation gap formed between one side of the block 22 and the inner wall of the installation slot for the movable installation of the first permanent magnet 20, and the limit block 23 is tightly fitted and installed in the installation gap, and at the same time the The limit block 23 is also arranged above the first permanent magnet 20, the spring 24 is placed between the limit block 23 and the first permanent magnet 20, and the upper and lower ends of the spring 24 are also They are correspondingly positioned and connected to the lower side of the limiting 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 has a downward elastic force. 20 When the driving coil is in a non-energized state, it can elastically press against the lower ends of the two soft copper sheets; the stopper sheet is positioned and installed at the upper opening of the installation slot, so as to prevent the installation block 22 and the limit block 23 for stop and limit;

The structure to realize that the two soft copper sheets are both vertically and positioned in the installation slot is as follows: the installation block 22 is provided with two vertical slots extending respectively, and the two soft copper The slices are respectively correspondingly inserted into the two slots.

Further preferably, each of the two soft copper sheets has an inverted L-shaped copper sheet A210 arranged vertically and a L-shaped copper sheet B211 arranged laterally (refer to Figure 6 for details) , wherein, the two copper sheets A210 are respectively inserted into the two slots, and the upper sides of the two copper sheets A210 are also protruded out of the upper opening of the installation slot, so as to As a signal output terminal; one end of the two copper sheets B211 is respectively connected with the bottom ends of the two copper sheets A210, and the other ends of the two copper sheets B211 are both extended on the first permanent magnet 20, and when the driving coil is in a non-energized state, the other ends of the two copper sheets B211 are in contact with the first permanent magnet 20, respectively.

Further preferably, the structure that the first permanent magnet 20 can be disconnected from the lower ends of the two soft copper sheets respectively is as follows: the DC contactor further includes a movably arranged in the space enclosed by the driving coil. The movable iron core 3 and a vertically arranged push rod 4, the lower end of the push rod 4 is tightly fitted and inserted into the movable iron core 3, and the upper end of the push rod 4 is movably inserted into the arc extinguishing cavity 1; the auxiliary mechanism also includes a second permanent magnet 25, the second permanent magnet 25 is built in the arc extinguishing chamber 1, and at the same time is positioned and connected to the upper end of the push rod 4, the second permanent magnet 25 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 opposite sides, that is, the second permanent magnet 25 has the same polarity. The polarity of the side surface is the same as that of the lower side surface of the first permanent magnet 20;

In this way, when the driving coil is energized, the second permanent magnet 25 can move upward together with the push rod 4 , and at that time, the first permanent magnet 20 can be connected with the second permanent magnet 25 at the same time. Under the action of the repulsive force generated between the two pieces, it elastically moves upward, so that it is disconnected from the lower ends of the two soft copper sheets.

Further preferably, the structure for realizing the positioning connection between the second permanent magnet 25 and the upper end of the push rod 4 is: the auxiliary mechanism also includes a plastic material and is fixedly connected to the push rod 4 through an injection molding process. On the connection block 26 on the upper end, the second permanent magnet 25 is positioned and embedded on the connection block 26 .

To sum up, the working principle of the auxiliary mechanism of the present invention is as follows: when the drive coil is in a non-energized state, the push rod 4 does not move, and the first permanent magnet 20 is under the elastic force of the spring 24. Press against the lower ends of the two soft copper sheets, so that the signal output member 21 is in a conducting state; and when the driving coil is in an energized state, the push rod 4 starts to move upward, and the first The two permanent magnets 25 move upward along with them. 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 be under the action of the repulsive force. Overcoming the elastic force of the spring 24 to achieve 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 member 21 is in a disconnected state.

In a word, on the one hand, the auxiliary mechanism of the present invention can accurately determine the ON and OFF states of the contact mechanism, which greatly improves the stability of the DC contactor during operation; Some components are installed outside the arc extinguishing chamber, which can effectively reduce the adverse effect of the arc on the auxiliary mechanism, which not only improves the safety, accuracy and stability of the auxiliary mechanism during operation, but also prolongs the auxiliary mechanism. the service life of the institution.

The above are only the preferred embodiments of the present invention, but are not intended to limit the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several Improvements and modifications should also be considered within the scope of the present invention.

Claims (6)

1. The utility model provides a direct current contactor complementary unit, direct current contactor include arc-extinguishing chamber (1) and set up in the outer drive coil in arc-extinguishing chamber (1), its characterized in that: the auxiliary mechanism comprises a first permanent magnet (20) and a signal output piece (21), wherein the first permanent magnet is elastically installed on the outer wall of the arc extinguishing chamber (1), the signal output piece (21) is also installed 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 correspondingly contacted with or disconnected from the signal output piece (21), so that the signal output piece (21) is correspondingly in a conducting state or a disconnecting state.

2. The dc contactor assist mechanism of claim 1, wherein: the arc extinguishing chamber is provided with a ceramic tube (10), a magnetic pole plate (11) and a connecting ring (12), wherein the ceramic tube (10) is of a hollow cylinder structure with an open lower side, and the magnetic pole plate (11) is hermetically and fixedly connected to the lower side of the ceramic tube (10) through the connecting ring (12), namely the ceramic tube (10), the magnetic pole plate (11) and the connecting ring (12) jointly enclose the arc extinguishing chamber (1);

in addition, a mounting groove which extends vertically and is opened on the top surface of the ceramic tube (10) is arranged on the outer wall of the ceramic tube, the first permanent magnet (20) is elastically mounted in the mounting groove, the signal output part (21) is provided with two soft copper sheets, the two soft copper sheets are vertically and fixedly mounted in the mounting groove, meanwhile, the lower ends of the two soft copper sheets also extend below the first permanent magnet (20), and the upper ends of the two soft copper sheets also extend out of the upper opening of the mounting groove to serve as signal output ends;

when the driving coil is in a non-electrified state, the first permanent magnet (20) can elastically abut against the lower ends of the two soft copper sheets so as to enable the two soft copper sheets to be communicated; and when the driving coil is in a power-on state, the first permanent magnet (20) can be disconnected with the lower ends of the two soft copper sheets, so that the two soft copper sheets are disconnected.

3. The dc contactor assist mechanism of claim 2, wherein: the structure for realizing that the first permanent magnet (20) is elastically installed in the installation groove is as follows: the auxiliary mechanism further comprises an installation block (22), a limiting block (23), a spring (24) and a stop sheet, wherein the installation block (22) is embedded in the installation groove in a tight fit manner, an installation gap for movably installing the first permanent magnet (20) is further formed between one side of the installation block (22) and the inner wall of the installation groove, the limiting block (23) is installed in the installation gap in a tight fit manner, the limiting block (23) is also arranged above the first permanent magnet (20), the spring (24) is arranged between the limiting block (23) and the first permanent magnet (20), the upper end and the lower end of the spring (24) are correspondingly positioned and connected with the lower side of the limiting block (23) and the upper side of the first permanent magnet (20) respectively, namely the spring (24) provides downward elasticity for 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 driving coil is in a non-electrified state; the stop piece is positioned and arranged at the upper opening of the mounting groove so as to stop and limit the mounting block (22) and the limiting block (23);

realize two the equal vertical and location of soft copper sheet install the structure in the mounting groove does: two slots which respectively extend along the vertical direction are arranged on the mounting block (22), and the two soft copper sheets are respectively and correspondingly inserted into the two slots.

4. The dc contactor assist mechanism of claim 3, wherein: the two soft copper sheets are respectively provided with a copper sheet A (210) which is vertically arranged and is in an inverted L shape and a copper sheet B (211) which is transversely arranged and is in an L shape, wherein the two copper sheets A (210) are correspondingly inserted into the two slots respectively, and the upper sides of the two copper sheets A (210) extend out of the upper opening of the mounting slot to be used as signal output ends; one ends of the two copper sheets B (211) are respectively and correspondingly connected with the bottom ends of the two copper sheets A (210) in an integrated mode, the other ends of the two copper sheets B (211) extend below the first permanent magnet (20), and when the driving coil is in a non-electrified state, the other ends of the two copper sheets B (211) are respectively in contact with the first permanent magnet (20).

5. The dc contactor assist mechanism of claim 2, wherein: the structure for realizing that the first permanent magnet (20) can be respectively disconnected with the lower ends of the two soft copper sheets is as follows: the direct current contactor also comprises a movable iron core (3) movably arranged in a space enclosed by the driving coils and a push rod (4) vertically arranged, the lower end of the push rod (4) is tightly matched and inserted in the movable iron core (3), and the upper end of the push rod (4) is movably inserted in the arc extinguishing cavity (1); the auxiliary mechanism further comprises a second permanent magnet (25), the second permanent magnet (25) is arranged in the arc extinguishing chamber (1) and is connected with the upper end of the push rod (4) in a positioning mode, the second permanent magnet (25) is also arranged opposite to the first permanent magnet (20), and the polarity of the two opposite side faces of the second permanent magnet (25) and the first permanent magnet (20) is the same;

when the driving coil is in a power-on state, the second permanent magnet (25) can move upwards along with the push rod (4), and at the moment, the first permanent magnet (20) can move upwards elastically under the action of a repulsive force generated between the first permanent magnet and the second permanent magnet (25) so as to be disconnected from the lower ends of the two soft copper sheets.

6. The dc contactor assist mechanism of claim 5, wherein: the structure for realizing the positioning connection of the second permanent magnet (25) and the upper end of the push rod (4) is as follows: the auxiliary mechanism further comprises a connecting block (26) which is made of plastic materials and is fixedly connected to the upper end of the push rod (4), and the second permanent magnet (25) is positioned and embedded on the connecting block (26).

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