Non-polarity high voltage DC contactor arc extinguishing device

Abstract

The present invention discloses an arc extinguishing device for a non-polarity high-voltage direct current contactor, comprising: an arc extinguishing cover, two static contacts and a movable contact piece installed at intervals on the arc extinguishing cover, the inner cavity of the arc extinguishing cover forming an arc extinguishing chamber, the movable contact piece being placed in the arc extinguishing chamber and being able to move relative to the two static contacts to connect the two static contacts, the arc extinguishing chamber being located on both sides of the connecting line of the two static contacts to form an arc-drawing space, at least one pair of permanent magnets being installed on the arc extinguishing cover corresponding to the arc-drawing space, and the magnetic field generated by the permanent magnets causing the arcs generated by the two static contacts to move toward the arc-drawing space. The present invention provides an arc extinguishing device for a non-polarity high-voltage direct current contactor, which ensures a maximum arc-drawing space without changing the position of the static contacts, thereby improving the arc extinguishing effect and meeting the requirements for completing the research and development of high-power non-polarity products within a limited space.

Description

Technical Field

[0001] The present invention relates to the field of contactors, in particular to an arc extinguishing device for a non-polarity high-voltage direct current contactor. Background Art

[0002] Non-polarity high-voltage DC contactors do not distinguish between forward and reverse current flows, and have identical electrical performance in both directions. This offers significant advantages in preventing misuse in applications requiring non-polarity, such as in automotive charging stations and the photovoltaic industry, as there is no need to distinguish between the positive and negative poles of the contactor during installation. However, the performance of the non-polarity contactors currently available on the market has been significantly reduced, failing to meet customer needs.

[0003] The structures of existing non-polarity contactors are generally divided into two types: one is as follows Figure 1 As shown in the figure, magnets A100 are installed on both sides of the front and rear of the static contact, and the polarity of magnets A100 is N-pole. The arc movement direction is drawn according to the inflow and outflow direction of the current. Under the action of the magnetic field generated by magnets A100, the arc is guided to the front and rear sides. Although no matter what the direction of the current is, the arc will not collide, and the non-polarity requirement is achieved, the disadvantage of this structure is that within the specified space size, there is no way to increase the arc space, and the arc space determines the arc extinguishing effect, which cannot meet the needs of high-power use. The other is as follows Figure 2 As shown, magnets B200 are installed on both the left and right sides of the static contact, and the two magnets B200 have different polarities. This arrangement of magnets B200 prevents arc collision regardless of which direction the current flows from. However, the disadvantage is that the arcing space in this structure is still small and cannot be fully utilized. Therefore, to meet the current demand for forward and reverse operation in new energy, vehicle charging stations, and photovoltaic equipment, the development of a high-power non-polarity contactor is particularly important. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide an arc extinguishing device for a non-polarity high-voltage DC contactor, so as to overcome the defect that the existing non-polarity contactor cannot increase the power due to being limited by the arcing space.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an arc extinguishing device for a non-polar high-voltage DC contactor, comprising: an arc extinguishing cover, two static contacts and a moving contact piece installed at intervals on the arc extinguishing cover, the inner cavity of the arc extinguishing cover forming an arc extinguishing chamber, the bottoms of the two static contacts extending into the arc extinguishing chamber, the moving contact piece being placed in the arc extinguishing chamber and being able to move relative to the two static contacts to conduct the two static contacts, the arc extinguishing chamber being located on both sides of the connecting line of the two static contacts to form an arc-drawing space, at least a pair of permanent magnets being installed on the arc extinguishing cover corresponding to the arc-drawing space, and the arc generated by the two static contacts being caused to move toward the arc-drawing space under the action of the magnetic field generated by the permanent magnets.

[0006] As a further improvement of the present invention, the arc extinguishing cover is square, and the two static contacts are arranged diagonally.

[0007] As a further improvement of the present invention, the permanent magnet is installed on any two side walls of the arc extinguishing cover, and the polarity of the permanent magnet is N pole;

[0008] Or the permanent magnets with the same polarity are installed on the four side walls of the arc extinguishing cover;

[0009] Or the permanent magnets are installed on all four side walls of the arc extinguishing cover, and the two permanent magnets corresponding to the arc pulling space on the same side have different polarities.

[0010] As a further improvement of the present invention, the permanent magnet is installed on the outer side wall of the arc extinguishing cover, and a magnetic steel frame is installed on the outer side of the permanent magnet.

[0011] As a further improvement of the present invention, an isolation plate is provided on the top of the arc extinguishing cover between the two static contacts.

[0012] As a further improvement of the present invention, a fixing groove for positioning the moving contact piece is provided on the top inner wall of the arc extinguishing cover body between the two static contacts.

[0013] As a further improvement of the present invention, the arc extinguishing cover is made of ceramic material.

[0014] As a further improvement of the present invention, the permanent magnet is magnetic steel.

[0015] The beneficial effects of the present invention are:

[0016] 1. The present invention provides an arc extinguishing device for a non-polarity high-voltage DC contactor. By arranging two static contacts diagonally within an arc extinguishing cover, arc-drawing spaces are formed on both sides of the connecting line of the two static contacts. A permanent magnet is installed on the arc extinguishing cover at a position corresponding to the arc-drawing space. The arc generated by the static contacts is guided to the arc-drawing space by the combined action of the current and magnetic flux lines and extinguished. Regardless of the direction of the current, no arc collision occurs, thus achieving the non-polarity requirement. Without changing the position of the static contacts, the maximum arc-drawing space is ensured, the arc-extinguishing effect is improved, and the space within the contactor is maximized. This allows the development of high-power non-polarity products within a limited space, improves product performance, and meets user needs.

[0017] 2. The placement of permanent magnets will not disturb the magnetic flux lines between the magnets, thus avoiding interference between the magnetic flux lines and improving the utilization rate of magnetic force.

[0018] 3. By installing the permanent magnet on the outer wall of the arc extinguishing cover, it can avoid occupying the arc extinguishing chamber space, ensuring the maximum arc drawing space, and at the same time prevent the arc from hitting the permanent magnet, causing the loss of magnetic force and the risk of the entire product failing to complete the arc extinguishing function;

[0019] 4. The polarity of the permanent magnet can be placed without restriction, and non-polar products can be made with a variety of placement positions;

[0020] 5. This structure can automatically change the size of the arc space according to the length of the moving contact piece, and has a certain linearity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an existing contactor arc extinguishing device;

[0022] Figure 2 It is a structural schematic diagram of another existing contactor arc extinguishing device;

[0023] Figure 3 A perspective view of a first embodiment of the present invention;

[0024] Figure 4 A bottom perspective view of a first embodiment of the present invention;

[0025] Figure 5 This is a structural diagram of a permanent magnet placement method according to a first embodiment of the present invention;

[0026] Figure 6 This is a cross-sectional view illustrating the arc movement direction according to the current flow in accordance with the first embodiment of the present invention;

[0027] Figure 7 For example 1 of the present invention Figure 6 A cross-sectional view showing the arc motion direction in the opposite direction of the current;

[0028] Figure 8 This is a structural diagram of the permanent magnet placement method of the second embodiment of the present invention;

[0029] Figure 9 This is a structural diagram of the permanent magnet placement method of embodiment 3 of the present invention;

[0030] Figure 10 This is a structural diagram of the arrangement of permanent magnets according to the fourth embodiment of the present invention;

[0031] Figure 11 This is a structural diagram of the arrangement of permanent magnets according to the fifth embodiment of the present invention;

[0032] Figure 12 This is a structural diagram of the arrangement of permanent magnets according to the sixth embodiment of the present invention;

[0033] Figure 13 This is a structural diagram of the arrangement of permanent magnets according to the seventh embodiment of the present invention;

[0034] in:

[0035] Figure 1 、 Figure 2 、 Figure 6 and Figure 7 The direction indicated by the arrow is the direction of arc movement;

[0036] Figure 5 The direction indicated by the arrow is the direction of the magnetic flux line;

[0037] The "N" and "S" signs in the figure refer to the polarity of the permanent magnets, namely the N pole and the S pole respectively.

[0038] The “+” and “-” signs in the figure indicate the direction of current flow, “+” indicates the direction of current flow in, and “-” indicates the direction of current flow out.

[0039] The following description is made with reference to the accompanying drawings:

[0040] 100——Magnetic steel A; 200——Magnetic steel B;

[0041] 1——arc extinguishing cover; 101——arc extinguishing chamber;

[0042] 1011——arc drawing space; 102——isolation board;

[0043] 103——fixed slot; 2——static contact;

[0044] 3——moving contact piece; 4——permanent magnet;

[0045] 5——Magnetic steel frame. DETAILED DESCRIPTION

[0046] A preferred embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0047] Example 1:

[0048] See Figures 3 to 7 The present invention provides an arc-extinguishing device for a non-polarity high-voltage DC contactor, comprising an arc-extinguishing housing 1, two stationary contacts 2 spaced apart and mounted on the arc-extinguishing housing 1, and a movable contact piece 3. The arc-extinguishing housing 1 is made of ceramic material and is sealed and fixedly connected to the magnetic conductive plate of the contactor. The inner cavity of the arc-extinguishing housing 1 forms an arc-extinguishing chamber 101. The bottoms of the two stationary contacts 2 extend into the arc-extinguishing chamber 101. The movable contact piece 3 is movably disposed within the arc-extinguishing chamber 101 and faces the bottoms of the two stationary contacts 2. The movable contact piece 3 can move upward relative to the two stationary contacts 2 to contact the two stationary contacts 2, thereby conducting the two stationary contacts 2.

[0049] See Figure 4 The arc extinguishing chamber 101 is located on both sides of the connecting line of the two static contacts 2, and an arc-drawing space 1011 is formed. Two pairs of permanent magnets 4 are installed on the arc-drawing cover 1 corresponding to the arc-drawing space 1011. The permanent magnet 4 is a magnetic steel. Under the action of the magnetic field generated by the permanent magnet 4, the arc generated by the two static contacts 2 moves toward the arc-drawing space 1011.

[0050] See Figures 5 to 7 , the arc extinguishing cover 1 is square, and the two static contacts 2 are arranged diagonally, and the two pairs of permanent magnets 4 corresponding to the two static contacts 2 are also arranged diagonally, that is, the four permanent magnets 4 are respectively installed on the four side walls of the arc extinguishing cover 1, and the two permanent magnets 4 located at the same corner are close to each other, and the four permanent magnets 4 are symmetrical along the diagonal of the arc extinguishing cover 1. The two permanent magnets 4 corresponding to the arcing space 1011 on the same side have different polarities. In this embodiment, the permanent magnets 4 are placed as follows: the polarity of the two permanent magnets 4 corresponding to the same corner of the left static contact 2 is N pole, and the polarity of the other two permanent magnets 4 corresponding to the same corner of the right static contact 2 is S pole. The direction of the magnetic field generated by the joint action of the four permanent magnets 4 is toward the right (refer to Figure 5 By adopting this arrangement of the permanent magnets 4, the magnetic flux lines between the magnets will not be disturbed, thus avoiding mutual interference between the magnetic flux lines and improving the utilization rate of the magnetic force.

[0051] See Figure 6When the contactor is working, the coil is energized to generate magnetic force. The moving iron core moves upward under the action of the magnetic force until it contacts the static iron core. The push rod also moves upward at the same speed as the moving iron core. The push rod carries the moving contact piece 3 and moves upward to contact and connect the two static contacts 2. At this time, the product is connected. When the coil is de-energized, the magnetic force disappears. Under the action of the reset spring, the moving contact piece 3 is released. At this time, an arc is generated on the two static contacts 2. Since the direction of current flows in from the left static contact 2 and out of the right static contact 2, and according to the left-hand rule, the arc generated by the left static contact 2 is led to the arc-drawing space 1011 below under the joint action of the current and magnetic flux lines, and the arc generated by the right static contact 2 is led to the arc-drawing space 1011 above under the joint action of the current and magnetic flux lines. Finally, the arc is extinguished under the joint action of the permanent magnet 4 and the arc-drawing space 1011.

[0052] See Figure 7 , the moving contact piece 3 is released under the action of the reset spring, and an arc is generated on the two static contacts 2 at this time. Since the direction of current flows in from the right static contact 2 and flows out from the left static contact 2, and according to the left-hand rule, in the magnetic field, the arc generated by the left static contact 2 is led to the upper arc-drawing space 1011 under the combined action of the current and magnetic flux lines, and the arc generated by the right static contact 2 is led to the lower arc-drawing space 1011 under the combined action of the current and magnetic flux lines. Finally, the arc is extinguished under the combined action of the permanent magnet 4 and the arc-drawing space 1011.

[0053] With this structural design, regardless of the direction of the current, the arcs generated by the two static contacts 2 can be directed into the two arc-drawing spaces 1011 respectively, without causing arc collision, thereby achieving the non-polarity requirement. Without changing the position of the static contact 2, the maximum arc-drawing space 1011 is guaranteed, the arc extinguishing effect is improved, the space inside the contactor is maximized, and the research and development of high-power non-polarity products is completed in a limited space.

[0054] Among them, the arc extinguishing cover 1 can also be circular or in other shapes, and the placement of its permanent magnet 4 remains unchanged. The present invention is mainly based on the fact that the space on both sides of the line connecting the two static contacts 2 in the arc extinguishing chamber 101 is the largest, and this space is effectively utilized to increase the arc pulling space 1011, and the arc is guided to this space to achieve a better arc extinguishing effect, thereby meeting the high-power working requirements.

[0055] See Figure 3Permanent magnets 4 are mounted on the outer wall of the arc-extinguishing housing 1. L-shaped magnetic steel frames 5 are installed outside the two permanent magnets 4 located in the same corner. This structure avoids occupying space in the arc-extinguishing chamber 101, ensuring maximum arc-drawing space 1011. It also prevents the arc from striking the permanent magnets 4, causing a loss of magnetic force and, consequently, preventing the entire product from completing its arc-extinguishing function. An isolation plate 102 is installed at the top of the arc-extinguishing housing 1, between the two static contacts 2, to increase creepage distance and prevent short circuits between the positive and negative poles.

[0056] See Figure 4 A fixing groove 103 for positioning the moving contact piece 3 is provided on the top inner wall of the arc extinguishing cover 1 between the two static contacts 2.

[0057] Example 2:

[0058] See Figure 8 The difference between this embodiment and the first embodiment is that the two permanent magnets 4 corresponding to the arc-drawing space 1011 on the same side have different polarities, and the two permanent magnets 4 located at the same corner also have different polarities. That is, among the four permanent magnets 4, any two adjacent permanent magnets 4 have different polarities. Specifically, the magnetic poles of the permanent magnets 4 located at the upper left, lower left, upper right, and lower right are N pole, S pole, S pole, and N pole, respectively. Using this arrangement of permanent magnets 4, the principle is the same as above. Regardless of the direction of the current, the arc generated by the two static contacts 2 can be directed upward or downward into the arc-drawing space 1011 without causing arc collision, thus achieving the polarity-free requirement.

[0059] Example 3, Example 4:

[0060] See Figure 9 and Figure 10 , which are respectively the placement methods of the permanent magnets 4 of the third and fourth embodiments. The difference from the first embodiment is that permanent magnets 4 with the same polarity are installed on the four side walls of the arc extinguishing cover 1. Among them, the polarity of the four permanent magnets 4 of the third embodiment is N pole, and the polarity of the four permanent magnets 4 of the fourth embodiment is S pole. Take the third embodiment for illustration: under the joint action of the two permanent magnets 4 distributed near the same angle as the static contact 2 on the left side, the magnetic force vector it receives is directed to the left. According to the left-hand rule, the arc will be drawn into the upper or lower arc-drawing space 1011, and the specific direction depends on the direction of current flow. Similarly, the arc generated by the static contact 2 on the right side will be drawn into the same arc-drawing space 1011, which will not cause arc collision and achieve the non-polarity requirement.

[0061] Example 5, Example 6, Example 7:

[0062] See Figures 11 to 13, which are respectively the placement methods of the permanent magnet 4 of Example 5, Example 6, and Example 7. The difference from Example 1 is that the permanent magnet 4 is only installed on any two side walls of the arc extinguishing cover 1, and the polarity of the permanent magnet 4 is N pole. With this placement method of the permanent magnet 4, no matter what the direction of the current is, the arc generated by the two static contacts 2 can be guided upward or downward into the arc pulling space 1011 without causing arc collision, thereby achieving the non-polarity requirement. The principle is the same as above and will not be repeated.

[0063] Thus, the present invention provides an arc extinguishing device for a non-polarity high-voltage DC contactor, which arranges two static contacts diagonally in the arc extinguishing cover, forms arc-drawing spaces on both sides of the connecting line of the two static contacts, and installs permanent magnets on the arc extinguishing cover corresponding to the arc-drawing spaces. The arc generated by the static contacts is led to the arc-drawing space and extinguished under the joint action of the current and the magnetic flux lines. No matter what the direction of the current is, it will not cause arc collision, thus achieving the non-polarity requirement. Without changing the position of the static contacts, the maximum arc-drawing space is guaranteed, the arc extinguishing effect is improved, the space in the contactor is maximized, and the high-power non-polarity generation can be completed in a limited space. Research and development of products, improve product performance, meet user needs; the use of this permanent magnet placement method will not disturb the magnetic flux lines between magnets, avoid mutual interference between magnetic flux lines, and improve magnetic force utilization; by installing the permanent magnet on the outer wall of the arc extinguishing cover, it can avoid occupying the arc extinguishing chamber space, ensure the maximum arc drawing space, and at the same time prevent the arc from hitting the permanent magnet and causing loss of magnetic force, thereby causing the risk of the entire product being unable to complete the arc extinguishing function; the polarity of the permanent magnet can be placed without restriction, and a variety of placement positions can be used to make non-polar products; this structure can automatically change the size of the arc drawing space according to the length of the moving contact piece, and has a certain linearity.

[0064] In the above description, many specific details are set forth in order to fully understand the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited to the specific implementation disclosed above. At the same time, any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An arc extinguishing device for a non-polarity high-voltage DC contactor, comprising an arc extinguishing cover (1), two static contacts (2) and a movable contact piece (3) spaced apart and mounted on the arc extinguishing cover (1), wherein the inner cavity of the arc extinguishing cover (1) forms an arc extinguishing chamber (101), the bottoms of the two static contacts (2) extend into the arc extinguishing chamber (101), the movable contact piece (3) is disposed in the arc extinguishing chamber (101) and can move relative to the two static contacts (2) to conduct the two static contacts (2), and is characterized in that: The arc extinguishing cover (1) is square, and the two static contacts (2) are arranged diagonally on the arc extinguishing cover (1), so that the arc extinguishing chamber (101) is located on both sides of the connection line of the two static contacts (2) to form arc-drawing spaces (1011), and at least one pair of permanent magnets (4) are installed on the arc extinguishing cover (1) corresponding to the arc-drawing spaces (1011). Under the action of the magnetic field generated by the permanent magnets (4), the arcs generated by the two static contacts (2) move toward the arc-drawing spaces (1011).

2. The non-polarity high-voltage DC contactor arc extinguishing device according to claim 1, characterized in that: The permanent magnet (4) is mounted on any two side walls of the arc extinguishing cover (1), and the polarity of the permanent magnet (4) is N pole; Or the permanent magnets (4) with the same polarity are installed on all four side walls of the arc extinguishing cover (1); Or the permanent magnets (4) are installed on all four side walls of the arc extinguishing cover (1), and the two permanent magnets (4) corresponding to the arc-drawing space (1011) on the same side have different polarities.

3. The non-polarity high-voltage DC contactor arc extinguishing device according to claim 1, characterized in that: The permanent magnet (4) is mounted on the outer side wall of the arc extinguishing cover (1), and a magnetic steel frame (5) is mounted on the outer side of the permanent magnet (4).

4. The non-polarity high-voltage DC contactor arc extinguishing device according to claim 1, characterized in that: An isolation plate (102) is provided on the top of the arc extinguishing cover (1) between the two static contacts (2).

5. The non-polarity high-voltage DC contactor arc extinguishing device according to claim 1, characterized in that: A fixing groove (103) for positioning the moving contact piece (3) is provided on the top inner wall of the arc extinguishing cover (1) between the two static contacts (2).

6. The non-polarity high-voltage DC contactor arc extinguishing device according to claim 1, characterized in that: The arc extinguishing cover (1) is made of ceramic material.

7. The non-polarity high-voltage DC contactor arc extinguishing device according to any one of claims 1 to 6, characterized in that: The permanent magnet (4) is magnetic steel.

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