Iron core structure and high-voltage direct current contactor

Abstract

The utility model discloses an iron core structure and high voltage direct current contactor relates to contactor technical field, the iron core structure includes static iron core, movable iron core, push rod and reset piece, static iron core is equipped with first through hole, movable iron core is equipped with second through hole coaxial with first through hole, push rod is installed in second through hole and passes through first through hole, and the reset piece is equipped with reset piece. The reset piece abuts against the static iron core and the movable iron core, one of the static iron core and the movable iron core faces the other one and is provided with an annular groove, and the second annular groove surrounds the second through hole. According to the scheme, the annular groove is formed in the static iron core or the movable iron core, so that the magnetic pole area of the two iron cores is reduced, the rebound time is reduced, and the retention, the stability and the reliability of the contactor are improved.

Description

Technical Field

[0001] This utility model relates to the field of contactor technology, and in particular to a core structure and a high-voltage DC contactor. Background Technology

[0002] High-voltage DC contactors, as electrical devices for long-distance connection and disconnection of DC circuits, feature large control capacity, suitability for frequent operation, and remote intelligent control. They play a vital role in power systems and are widely used in solar energy systems, urban rail transit, subways, charging piles, energy storage battery packs, uninterruptible power supplies, and the communications industry. High-voltage DC contactors can withstand voltages of several thousand volts or even higher without breakdown or flashover, and can carry or disconnect currents of several hundred to several thousand amperes. The contact components are specially designed to ensure long lifespan and reliability under frequent operation and extreme working conditions. Furthermore, high-voltage DC contactors are small in size and light in weight, facilitating transportation, installation, and maintenance, reducing downtime and maintenance costs, thereby ensuring safe, efficient, and reliable power transmission.

[0003] The electromagnetic system in a high-voltage DC contactor mainly consists of a coil, a stationary iron core, and a moving iron core. When the coil is energized, the generated magnetic field magnetizes the moving and stationary iron cores, creating an attractive force between them. The moving iron core moves towards the stationary iron core, and the moving contact moves along with it until the moving and stationary contacts make contact, thus completing the circuit. When the current is interrupted, the moving iron core returns to its original position under the action of a return spring, the moving and stationary contacts separate, and the circuit is broken. This electromagnetic system, which uses electromagnetism to generate force, can quickly convert electrical signals into mechanical signals from the contacts, making the contactor suitable for applications requiring frequent operation.

[0004] In related technologies, DC contactor cores generally adopt a cylindrical structure. The moving and stationary cores often use a plane-to-plane contact method, and the magnetic pole area is relatively large. During the product's attraction process, the magnetic attraction force is evenly distributed on the core pole surface. When there are foreign objects on the core pole surface, it is very easy to cause imbalance of the core, which in turn causes the contacts to bounce, affecting the product's mechanical and electrical life. Utility Model Content

[0005] The main purpose of this invention is to propose a core structure and a high-voltage DC contactor, which aims to reduce the reverse impulse by reducing the magnetic pole area, thereby reducing the return time and improving the stability and reliability of the contactor.

[0006] To achieve the above objectives, the present invention proposes an iron core structure comprising a stationary iron core, a moving iron core, a push rod, and a reset member. The stationary iron core is provided with a first through hole, and the moving iron core is provided with a second through hole coaxial with the first through hole. The push rod is installed in the second through hole and movably passes through the first through hole. The reset member abuts against the stationary iron core and the moving iron core respectively.

[0007] One of the stationary iron core and the moving iron core is provided with an annular groove facing the other;

[0008] The iron core structure has an engaged state and a disengaged state. In the engaged state, the coil around the moving iron core is energized, and the moving iron core abuts against the stationary iron core under the action of magnetic force, and the reset member is compressed. In the disengaged state, the coil around the moving iron core is de-energized, and the moving iron core disengages from the stationary iron core under the elastic force of the reset member.

[0009] In one embodiment, the stationary iron core has a first annular groove facing the moving iron core, the first annular groove surrounding the first through hole, and the moving iron core has a second annular groove facing the stationary iron core, the second annular groove surrounding the second through hole.

[0010] In one embodiment, the first annular groove is connected to and coaxially arranged with the first through hole; the second annular groove is connected to and coaxially arranged with the second through hole, and the projection of the first annular groove onto the moving iron core is adapted to the area of ​​the second annular groove.

[0011] In one embodiment, the bottom of the first annular groove is provided with a first mounting step, which is connected to the first through hole; the bottom of the second annular groove is provided with a second mounting step, which is connected to the second through hole.

[0012] The two ends of the reset member abut against the first mounting step and the second mounting step, respectively.

[0013] In one embodiment, the reset member is a reaction spring, and the two ends of the reaction spring abut against the side of the stationary iron core facing the moving iron core and the side of the moving iron core facing the stationary iron core, respectively.

[0014] In one embodiment, one end of the push rod is provided with a spline shaft, and the side of the stationary iron core facing the spline shaft is provided with an annular limiting boss. The annular limiting boss is arranged around the first through hole and is used to abut and limit the spline shaft.

[0015] In one embodiment, the push rod has a chamfered pin at the end away from the spline shaft, and the moving iron core has a mounting groove at the end away from the stationary iron core. The iron core structure also includes a snap-fit ​​block, which is located in the mounting groove and has a chamfered hole. The chamfered pin and the chamfered hole are engaged in a snap-fit ​​fit.

[0016] The push rod is provided with a chamfered pin at the end away from the spline shaft, and the moving iron core is provided with a mounting groove at the end away from the stationary iron core, and the mounting groove is filled with adhesive.

[0017] In one embodiment, the first annular groove is disposed circumferentially in the first through hole and spaced apart from the first through hole; the second annular groove is disposed circumferentially in the second through hole and spaced apart from the second through hole.

[0018] In one embodiment, the core structure further includes a coil, which is sleeved on the moving core.

[0019] This utility model also proposes a high-voltage DC contactor, comprising:

[0020] The housing has a cavity, and a stationary contact and an auxiliary contact are provided inside the housing;

[0021] The core structure includes a stationary core and a moving core both located outside the accommodating cavity, with a portion of the push rod extending into the outer shell; and...

[0022] A moving contact assembly, the moving contact assembly including a push plate and a moving contact disposed on the push plate, the push plate being disposed on the push rod.

[0023] This utility model proposes a core structure and a high-voltage DC contactor. The core structure includes a stationary core, a moving core, a push rod, and a reset member. The stationary core has a first through hole, and the moving core has a second through hole coaxial with the first through hole. The push rod is installed in the second through hole and movably passes through the first through hole. The reset member abuts against the stationary core and the moving core respectively. The core structure has an attracted state and a disengaged state. In the attracted state, the moving core moves along the axial direction of the push rod under the action of magnetic force until it is in contact with the stationary core. By energizing the coil around the moving core, a magnetic field is generated to magnetize the moving core and attract it to the stationary core. In the disengaged state, the coil is de-energized, and the moving core moves in the opposite direction and disengages from the stationary core under the action of the elastic repulsive force of the reset member. This solution reduces the magnetic pole area, i.e., the magnetic force area, of the two cores by setting an annular groove on the stationary core or the moving core, thereby reducing the return time and improving the holding force, stability, and reliability of the contactor. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of an embodiment of the iron core structure provided by this utility model;

[0026] Figure 2 This is a cross-sectional view of the iron core structure;

[0027] Figure 3 This is a schematic diagram of the stationary iron core in an iron core structure.

[0028] Figure 4 This is a schematic diagram of the moving iron core in an iron core structure;

[0029] Figure 5 for Figure 1 Schematic diagram of the middle push rod;

[0030] Figure 6 This is a structural schematic diagram of an embodiment of the high-voltage DC contactor provided by this utility model.

[0031] Explanation of icon numbers:

[0032] 100. High-voltage DC contactor; 1. Stationary iron core; 11. First through hole; 12. First annular groove; 13. Annular limiting boss; 2. Moving iron core; 21. Second through hole; 22. Second annular groove; 3. Push rod; 31. Splined shaft; 32. Chamfered pin; 4. Reaction spring; 5. Snap-fit ​​block; 200. Housing; 210. Upper housing; 220. Yoke plate; 300. Stationary contact; 400. Auxiliary contact.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] This invention proposes a core structure that aims to reduce the reverse impulse by decreasing the magnetic pole area, thereby reducing the return time and improving the stability and reliability of the contactor. Figures 1 to 6 This is a schematic diagram of one embodiment of the core structure provided by this utility model.

[0038] Please refer to Figures 1 to 6 This utility model proposes a core structure, including a stationary core 1, a moving core 2, a push rod 3, and a reset component. The stationary core 1 is provided with a first through hole 11, and the moving core 2 is provided with a second through hole 21 coaxial with the first through hole 11. The push rod 3 is installed in the second through hole 21 and movably passes through the first through hole 11. The reset component abuts against the stationary core 1 and the moving core 2 respectively.

[0039] One of the stationary iron core 1 and the moving iron core 2 has an annular groove facing the other;

[0040] The iron core structure has an engaged state and a disengaged state. In the engaged state, the coil around the moving iron core 2 is energized, and the moving iron core 2 comes into contact with the stationary iron core 1 under the action of magnetic force, and the reset member is compressed. In the disengaged state, the coil around the moving iron core 2 is de-energized, and the moving iron core 2 disengages from the stationary iron core 1 under the action of the elastic force of the reset member.

[0041] The present invention provides a core structure and a high-voltage DC contactor 100. The core structure includes a stationary core 1, a moving core 2, a push rod 3, and a reset component. The stationary core 1 has a first through hole 11, and the moving core 2 has a second through hole 21 coaxial with the first through hole 11. The push rod 3 is installed in the second through hole 21 and movably passes through the first through hole 11. The reset component abuts against both the stationary core 1 and the moving core 2. This core structure has an engaged state and a disengaged state; the engaged state is when the moving core... Under the action of magnetic force, core 2 moves along the axial direction of push rod 3 until it is in contact with stationary iron core 1. By energizing the coil around the moving iron core 2, a magnetic field is generated to magnetize the moving iron core 2 and attract it to the stationary iron core 1. When the coil is de-energized, the moving iron core 2 moves in the opposite direction and separates from the stationary iron core 1 under the action of the elastic repulsive force of the reset member. This solution reduces the magnetic pole area of ​​the two iron cores by setting an annular groove on the stationary iron core 1 or the moving iron core 2, thereby reducing the return time and improving the holding force, stability and reliability of the contactor.

[0042] It should be noted that, in order to reduce the magnetic field area of ​​the stationary iron core 1 and the moving iron core 2, an annular groove can be provided on the side of the stationary iron core 1 facing the moving iron core 2, or an annular groove can be provided on the side of the moving iron core 2 facing the stationary iron core 1, or an annular groove can be provided on both the stationary iron core 1 and the moving iron core 2, that is, a first annular groove 12 is provided on the stationary iron core 1 and a second annular groove 22 is provided on the moving iron core 2.

[0043] In one embodiment of this utility model, the first annular groove 12 on the stationary iron core 1 is connected to the first through hole 11, that is, the first annular groove 12 is arranged around the opening of the first through hole 11 facing the moving iron core 2. Correspondingly, the second annular groove 22 on the moving iron core 2 is connected to the second through hole 21, that is, the second annular groove 22 is arranged around the opening of the second through hole 21 facing the stationary iron core 1. When the coil on the outside of the moving iron core 2 is energized to generate a magnetic field that drives the moving iron core 2 to move toward the stationary iron core 1, the reset member is compressed. The deformation of the middle part of the reset member in the circumferential direction will cause squeezing and collision to the stationary iron core 1 and the moving iron core 2. In view of this, the first annular groove 12 and the second annular groove 22 mentioned above can also have the function of avoiding air collision and reserving sufficient deformation space for the deformation of the spring. In this way, the stationary iron core 1 and the moving iron core 2 and the spring can be prevented from being deformed or broken due to pressure.

[0044] When the moving iron core 2 is attracted to the stationary iron core 1, they collide. At the moment of collision, the edges of both the stationary and moving iron cores are prone to breakage. The force is initially concentrated at the contact point and then rapidly spreads to the entire contact surface. Due to the small contact area of ​​the iron core edges, greater pressure is generated on these smaller areas, leading to stress concentration. Therefore, this design uses rounded corners around the openings of the first annular groove 12 and the second annular groove 22 to disperse pressure and reduce stress concentration. This enhances impact resistance, reduces damage, and lowers maintenance costs, reducing the frequency and cost of maintenance and replacement. Furthermore, the projection of the first annular groove 12 onto the moving iron core 2 is matched to the area of ​​the second annular groove 22; that is, the diameters of the first and second annular grooves are the same, and their areas are identical, thereby simultaneously reducing the magnetic pole areas of both the stationary and moving iron cores 1 and 2.

[0045] To install the reaction spring 4, the bottom of the first annular groove 12 is provided with a first mounting step, which is connected to the first through hole 11. Correspondingly, the bottom of the second annular groove 22 is provided with a second mounting step, which is connected to the second through hole 21. The two ends of the reaction spring 4 are respectively installed and fixed on the first mounting step and the second mounting step. The first mounting step and the second mounting step have a certain depth, which can accommodate part of the structure of the reaction spring 4 and can guide and limit the reaction spring 4. The diameter of the first mounting step is smaller than that of the first annular groove 12 and larger than that of the first through hole 11. The diameter of the second mounting step is smaller than that of the second annular groove 22 and larger than that of the second through hole 21. Stepped hole structures are formed in the stationary iron core 1 and the moving iron core 2 respectively.

[0046] In one embodiment, the push rod 3 is directly fixed to one side of the push plate by rubber coating. Since the push rod 3 is cylindrical, it is prone to rotation around its central axis under applied torque. Furthermore, the push rod 3 acts as a transmission component, making it prone to relative rotation with the push plate. Therefore, this invention provides a splined shaft 31 at one end of the push rod 3. For details, please refer to further reference. Figure 1 and Figure 5 Firstly, the spline shaft 31 ensures more accurate and direct force transmission, thereby improving the contactor's operating sensitivity and reliability. Secondly, the spline shaft 31 can distribute the torque generated by the load, reducing wear and extending the service life of components. Furthermore, the spline structure can provide a certain degree of self-locking, reducing reliance on external locking devices in certain situations and preventing relative rotation between the push rod 3 and the push plate. The stationary iron core 1 has an annular limiting boss 13 on the side facing the spline shaft 31. For details, please refer to further documentation. Figure 2 Since the outer diameter of the spline shaft 31 is larger than the diameter of the push rod 3, the annular limiting boss 13 will engage with the spline shaft 31 to limit its movement, thereby ensuring that the push rod 3 will not separate from the stationary iron core 1 under the elastic repulsive force of the reaction spring 4.

[0047] The other end of the push rod 3 is provided with a chamfered pin 32. Correspondingly, the iron core structure also includes a snap-fit ​​block 5, which is located in the mounting groove and has a chamfered hole. The chamfered pin 32 and the chamfered hole are engaged, thus preventing the push rod 3 from rotating under force and further ensuring the reliability of the structure. In another embodiment of this utility model, in order to further simplify the anti-rotation structure of the moving iron core 2, an adhesive is filled into the mounting groove. The adhesive is generally glue. After the glue cures, it will cooperate with the chamfered pin 32 on the push rod 3 and the inner wall of the mounting groove to achieve anti-rotation.

[0048] This utility model also proposes a high-voltage DC contactor 100, which includes a housing 200, an iron core structure, and a moving contact assembly. The housing 200 forms a receiving cavity, and a stationary contact 300 and an auxiliary contact 400 are provided inside the housing 200. The stationary iron core 1 and the moving iron core 2 are both located outside the receiving cavity. A portion of the push rod 3 extends into the housing 200. The moving contact assembly includes a push plate and a moving contact located on the push plate. The push plate is located on the push rod 3. The specific structure of the iron core structure is as described in the above embodiments. Since this high-voltage DC contactor 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0049] In an embodiment of this utility model, the outer shell 200 includes an upper shell 210 and a yoke plate 220 covering the opening of the upper shell 210. An iron core structure is disposed on the yoke plate 220. A protective shell is provided on the side of the yoke plate 220 away from the upper shell 210. The protective shell is connected to the upper shell 210. The iron core structure is disposed inside the protective shell.

[0050] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A core structure, characterized in that, It includes a stationary iron core, a moving iron core, a push rod, and a reset component. The stationary iron core has a first through hole, and the moving iron core has a second through hole coaxial with the first through hole. The push rod is installed in the second through hole and movably passes through the first through hole. The reset component abuts against the stationary iron core and the moving iron core respectively. One of the stationary iron core and the moving iron core is provided with an annular groove facing the other; The iron core structure has an engaged state and a disengaged state. In the engaged state, the coil around the moving iron core is energized, and the moving iron core abuts against the stationary iron core under the action of magnetic force, and the reset member is compressed. In the disengaged state, the coil around the moving iron core is de-energized, and the moving iron core disengages from the stationary iron core under the elastic force of the reset member.

2. The core structure as described in claim 1, characterized in that, The stationary iron core has a first annular groove facing the moving iron core, and the first annular groove surrounds the first through hole. The moving iron core has a second annular groove facing the stationary iron core, and the second annular groove surrounds the second through hole.

3. The core structure as described in claim 2, characterized in that, The first annular groove is connected to the first through hole and is coaxially arranged with the first through hole; the second annular groove is connected to the second through hole and is coaxially arranged with the second through hole, and the projection of the first annular groove on the moving iron core is adapted to the area of ​​the second annular groove.

4. The core structure as described in claim 3, characterized in that, The bottom of the first annular groove is provided with a first mounting step, which is connected to the first through hole; the bottom of the second annular groove is provided with a second mounting step, which is connected to the second through hole. The two ends of the reset member abut against the first mounting step and the second mounting step, respectively.

5. The core structure as described in any one of claims 1 to 4, characterized in that, The reset component is a reaction spring, and the two ends of the reaction spring abut against the side of the stationary iron core facing the moving iron core and the side of the moving iron core facing the stationary iron core, respectively.

6. The core structure as described in any one of claims 1 to 4, characterized in that, One end of the push rod is provided with a spline shaft, and the stationary iron core is provided with an annular limiting boss on the side facing the spline shaft. The annular limiting boss is arranged around the first through hole and is used to abut and limit the spline shaft.

7. The core structure as described in claim 6, characterized in that, The push rod has a chamfered pin at the end away from the spline shaft, and the moving iron core has a mounting groove at the end away from the stationary iron core. The iron core structure also includes a snap-fit ​​block, which is located in the mounting groove and has a chamfered hole. The chamfered pin and the chamfered hole are engaged in a snap-fit ​​fit. The push rod is provided with a chamfered pin at the end away from the spline shaft, and the moving iron core is provided with a mounting groove at the end away from the stationary iron core, and the mounting groove is filled with adhesive.

8. The core structure as described in claim 2, characterized in that, The first annular groove is disposed circumferentially in the first through hole and spaced apart from the first through hole; the second annular groove is disposed circumferentially in the second through hole and spaced apart from the second through hole.

9. The core structure as described in any one of claims 1 to 4, characterized in that, The core structure also includes a coil, which is sleeved on the moving core.

10. A high-voltage DC contactor, characterized in that, include: The housing has a cavity, and a stationary contact and an auxiliary contact are provided inside the housing; In the core structure as described in any one of claims 1 to 8, both the stationary core and the moving core are located outside the receiving cavity, and a portion of the push rod extends into the outer shell; as well as A moving contact assembly, the moving contact assembly including a push plate and a moving contact disposed on the push plate, the push plate being disposed on the push rod.

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