A buffer system and a DC contactor having the same

Abstract

The present invention relates to the technical field of high-voltage electrical appliances, and specifically to a buffer system comprising: a positioning member, which passes through the armature in a vertical direction and is fixed on the iron core; the armature has a first position when it is attracted to the iron core, and a second position when the armature is disconnected from the iron core and contacts the buffer member; a stop member, which is arranged on the positioning member; a buffer member, which is arranged between the stop member and the armature, and the buffer member has a function of absorbing the kinetic energy released when the armature moves from the first position to the second position. The present invention also provides an electromagnetic system, an auxiliary contact system and a DC contactor having the same. The present invention effectively solves the problem of severe wear and even breakage of the armature and the positioning member caused by rigid collision between the armature and the positioning member. This ensures the stability and reliability of the action characteristics and working performance of the DC contactor after a mechanical life of 2 million times.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage electrical appliances, and in particular to a buffer system and a DC contactor having the same. Background Art

[0002] High-voltage, high-current DC contactors are used in DC circuits and are widely used in rail transit applications such as high-speed rail and subways. They are primarily used to start and stop traction motors. Given the stringent operational safety requirements of these sectors, increasingly stringent requirements are being placed on the DC contactors that control traction motors. First, DC contactors are frequently operated and require a long mechanical lifespan (up to 2 million operations). Second, the contactor's operating characteristics and performance must meet the requirements for safe, reliable, and stable operation within their mechanical lifespan.

[0003] Currently, high-current contactors used to control traction motors consist of a drive coil, core, yoke, reaction spring, and armature. When the drive coil loses power, the armature returns to its original position under the action of the reaction spring, completing the opening action. A positioning member mounted on the armature controls the opening stroke. However, during the opening action of the DC contactor, the armature and the positioning member collide rigidly, which can cause increased wear and even breakage, resulting in unreliable operation. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the armature and the positioning piece are severely worn or even broken due to rigid collision, thereby providing a buffer system that effectively reduces armature wear and breakage and a DC contactor having the same.

[0005] In order to solve the above technical problems, the present invention provides a buffer system, comprising:

[0006] a positioning member passing through the armature in a vertical direction and fixed to the iron core; the armature has a first position when it is attracted to the iron core, and a second position when the armature is disconnected from the iron core and contacts the buffer member;

[0007] a stopper, disposed on the positioning member;

[0008] The buffer member is provided between the stop member and the armature, and is used for absorbing the kinetic energy released when the armature moves from the first position to the second position.

[0009] Furthermore, the buffer member has a first surface in contact with the stopper and a second surface in contact with the armature.

[0010] Furthermore, the included angle between the first surface and the second surface is an acute angle.

[0011] Furthermore, it also includes a protrusion provided on the first surface for fixing the buffer member, and the protrusion is fixedly connected to the stopper.

[0012] Furthermore, the protrusion is mushroom-shaped.

[0013] Furthermore, the buffer is made of rubber.

[0014] Furthermore, the stopper comprises:

[0015] Fixed plate, U-shaped;

[0016] There are two mounting holes, symmetrically arranged on the fixing plate, for mounting the buffer member;

[0017] A connecting hole is provided between the two mounting holes, and the stopper is detachably connected to the positioning member through the connecting hole.

[0018] The present invention also provides a DC contactor, comprising the buffer system; an electromagnetic system and an auxiliary contact system.

[0019] Furthermore, the electromagnetic system includes: an armature, an iron core, a demagnetizing sheet and a magnetic yoke arranged in sequence along the vertical direction.

[0020] Furthermore, the auxiliary contact system includes:

[0021] A push rod is provided on the base and fixedly connected to the base;

[0022] The auxiliary contact device is arranged below the base. When the armature moves from the second position to the first position, the push rod abuts against the auxiliary contact device to transmit electrical signals.

[0023] Furthermore, a limiting structure is included; the limiting structure includes:

[0024] A limiting member, provided on the push rod;

[0025] The limiting groove is provided on the base and is suitable for the limiting member to be inserted into so as to limit the movement of the push rod relative to the base.

[0026] Furthermore, the push rod includes:

[0027] A support frame, wherein the limiting member is on the support frame, and the longitudinal section of the support frame is triangular;

[0028] A connecting plate is provided at one end of the support frame, and a reinforcing rib is provided at the connection between the connecting plate and the support frame.

[0029] Furthermore, two inclined surfaces are symmetrically provided on the end of the connecting plate away from the supporting frame.

[0030] The technical solution of the present invention has the following advantages:

[0031] 1. The buffer system provided by the present invention includes a positioning member extending vertically through the armature and fixed to the core; the armature has a first position when engaged with the core and a second position when disconnected from the core and in contact with the buffer member; a stop member disposed on the positioning member; and a buffer member disposed between the stop member and the armature, the buffer member being configured to absorb the kinetic energy released when the armature moves from the first position to the second position. When power is lost, the armature rapidly moves from the first position to the second position, impacting the buffer system. Due to the configuration of the buffer member, the buffer member effectively absorbs the kinetic energy released by the armature from the first position to the second position. This solves the problem of severe wear and even breakage of the armature and positioning member caused by rigid contact between the armature and the positioning member. This ensures the stability and reliability of the DC contactor's operating characteristics and performance after a mechanical lifespan of 2 million cycles.

[0032] 2. In the buffer system provided by the present invention, the buffer member has a first surface that contacts the stop member and a second surface that contacts the armature. When the armature moves from the first position to the second position, the upper surface of the armature closely contacts the second surface, thereby fully absorbing the kinetic energy released by the armature.

[0033] 3. The buffer system provided by the present invention further includes a protrusion provided on the first surface for fixing the buffer member, wherein the protrusion is fixedly connected to the stopper. The provision of the protrusion facilitates fixing the buffer member to the stopper.

[0034] 4. The electromagnetic system of the DC contactor provided by the present invention comprises: an armature, an iron core, a demagnetizing plate, and a magnetic yoke, arranged in sequence along a vertical direction. The demagnetizing plate is positioned between the iron core and the magnetic yoke to prevent direct impact of the armature on the demagnetizing plate when the electromagnetic system is engaged, thereby eliminating mechanical wear and brittle cracking of the demagnetizing plate caused by impact, and ensuring that the product meets the basic operating performance requirements of the 2 million cycles mechanical life test.

[0035] 5. In the DC contactor provided herein, the limiting structure comprises a limiting member disposed on the push rod; and a limiting slot disposed on the base, adapted to receive the limiting member and thereby restrict movement of the push rod relative to the base. The limiting slot and limiting member prevent relative displacement of the push rod and the auxiliary contact assembly when the push rod contacts the auxiliary contact assembly, thereby ensuring the reliability and stability of the auxiliary contact system during operation of the DC contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of a DC contactor provided by the present invention;

[0038] Figure 2 for Figure 1 Schematic diagram of the structure of the buffer system;

[0039] Figure 3 for Figure 2 A schematic diagram of the structure of the stopper;

[0040] Figure 4 for Figure 2 Schematic diagram of the structure of the buffer;

[0041] Figure 5 for Figure 2 Schematic diagram of the structure of the middle positioning member;

[0042] Figure 6 for Figure 1 A schematic diagram of the structure of the push rod;

[0043] Figure 7 for Figure 1 Schematic diagram of the structure of the middle base;

[0044] Figure 8 It is a structural diagram of the base and the push rod after they are matched;

[0045] Description of reference numerals:

[0046] 1- Stopper; 2- Fixing plate; 3- Mounting hole; 4- Connecting hole; 5- Buffer; 6- First surface; 7- Second surface; 8- Bump; 9- Positioning piece; 10- Armature; 11- Iron core; 12- Demagnetizing sheet; 13- Fastener; 14- Yoke; 15- Base; 16- Push rod; 17- Limiting piece; 18- Limiting slot; 19- Support frame; 20- Connecting plate; 21- Reinforcement rib; 22- Auxiliary contact assembly; 23- Rocker arm; 24- Rolling wheel; 25- Reaction spring; 26- Mounting plate; 27- Coil; 28- Inclined surface; 29- Nut; DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] like Figure 1-8 As shown, a buffer system provided in this embodiment of the present invention includes a positioning member 9, which passes through the armature 10 in the vertical direction and is fixed on the iron core 11; the armature 10 has a first position when it is attracted to the iron core 11, and a second position when the armature 10 is disconnected from the iron core 11 and contacts the buffer member 5; a stop member 1 is arranged on the positioning member 9; a buffer member 5 is arranged between the stop member 1 and the armature 10, and the buffer member 5 has a function of absorbing the kinetic energy released when the armature 10 moves from the first position to the second position.

[0050] The positioning member 9 is made of stainless steel. Figure 5 As shown, the positioning member 9 is T-shaped, with a through hole at its center. A fastener 13 extends through this through hole, securing the stopper 1 and positioning member 9 to the core 11, thereby securing the stopper 1 and positioning member 9 to the core 11. In this embodiment, the fastener 13 is a screw. The first position is the position of the armature 10 when it is engaged with the core 11, while the second position is the position of the armature 10 when it is disconnected from the core 11 and in contact with the buffer 5. When power is removed, the core 11 eliminates the attraction force on the armature 10, causing the armature 10 to rapidly move from the first position to the second position under the action of the reaction spring 25, thereby impacting the buffer system. Because the buffer 5 is made of rubber, it can effectively absorb the kinetic energy released by the armature 10 when it moves from the first position to the second position. This prevents rigid collision between the armature 10 and the positioning member, thereby ensuring the stability and reliability of the DC contactor's operating characteristics and performance after a mechanical lifespan of 2 million cycles.

[0051] like Figure 3-4As shown, the buffer member 5 has a first surface 6 that contacts the stopper 1 and a second surface 7 that contacts the armature 10. The angle formed by the second surface 7 and the plane on which the iron core 11 is located is consistent with the angle formed by the plane of the armature 10 and the plane on which the iron core 11 is located when the armature 10 is in the second position. This allows the upper surface of the armature 10 to completely contact the second surface 7 when the armature 10 moves from the first position to the second position, thereby completely absorbing the kinetic energy released by the armature 10. In this embodiment, the longitudinal cross-section of the buffer member 5 is a right-angled trapezoid. The first surface 6 is the top surface of the buffer member 5 and contacts the inner surface of the stopper 1. The second surface is the bottom surface of the buffer member 5 and forms an acute angle with the first surface 6 and the second surface 7. Setting the angle between the first surface 6 and the second surface 7 to an acute angle facilitates a close fit between the second surface 7 and the armature 10. The angle between the first surface 6 and the second surface 7 needs to be set according to the actual situation of the armature 10.

[0052] A protrusion 8 for securing the buffer member 5 is provided on the first surface 6 and is fixedly connected to the stopper 1. The stopper 1 comprises a U-shaped fixing plate 2; two symmetrical mounting holes 3 provided on the fixing plate 2 for mounting the buffer member 5; and a connecting hole 4 provided between the two mounting holes 3. The stopper 1 is detachably connected to the positioning member 9 via the connecting hole 4.

[0053] In this embodiment, two buffers 5 are symmetrically positioned at either end of the fixing plate 2. The protrusions 8 are mushroom-shaped. Since the protrusions 8 and the buffers 5 are injection-molded from polyurethane rubber, they possess a certain degree of elasticity, facilitating direct installation of the protrusions 8 within the two mounting holes 3 on the stopper 1, thereby securing the buffers 5 to the fixing plate 2. Furthermore, the fixing plate 2 is U-shaped, ensuring sufficient contact between the fixing plate 2 and the buffers 5, thereby enveloping the buffers 5 within the fixing plate 2 and providing a more secure fit. Furthermore, the provision of the connecting holes 4 facilitates the insertion of the fasteners 13 through the stopper 1 and the positioning member 9, thereby securing the stopper 1 above the positioning member 9.

[0054] In this embodiment, the diameter of the through hole formed in the armature 10 is larger than the diameter of the connecting hole 4 through which the positioning member 9 extends. The positioning member 9 and the armature 10 are in a dynamic fit, which prevents friction between the hole wall of the through hole in the armature 10 and the surrounding wall of the positioning member 9. This facilitates movement of the armature 10 from the first position to the second position, or vice versa, and reduces frictional resistance during movement.

[0055] like Figure 1 As shown, the present invention also provides a DC contactor, which includes not only the buffer system but also an electromagnetic system and an auxiliary contact system, wherein the buffer system is arranged above the electromagnetic system.

[0056] In this embodiment, the electromagnetic system includes: an armature 10, an iron core 11, a coil 27 sleeved on the outer wall of the iron core 11, a demagnetizing plate 12, and a magnetic yoke 14, arranged in sequence along a vertical direction. The demagnetizing plate 12 is disposed between the iron core 11 and the magnetic yoke 14 and secured to the mounting plate 26 via fasteners 13. Both the demagnetizing plate 12 and the fasteners 13 are made of non-magnetic metal materials and possess strong mechanical strength in terms of tensile and compressive strength. This prevents direct impact of the armature 10 on the demagnetizing plate 12 during the electromagnetic system's engagement process, thereby eliminating mechanical wear and brittle cracking of the demagnetizing plate 12 caused by the impact of movement, and ensuring that the product meets the basic requirements for its operational characteristics in a 2 million-cycle mechanical life test.

[0057] like Figure 6-8 As shown, the auxiliary contact system includes: a push rod 16 disposed on the base 15 and fixedly connected to the base 15; an auxiliary contact device 22 disposed below the base 15 and close to the iron core 11. When the armature 10 moves to the first position, the push rod 16 abuts against the auxiliary contact device 22 to transmit an electrical signal indicating whether the armature 10 is attracted or disconnected from the iron core 11. The base 15 is disposed on the end of the armature 10 away from the reaction spring 25 and is connected by a fastener 13 and a nut 29 to fix the push rod 16 to the base 15. In this embodiment, a limit groove 18 is disposed on the base 15, and a limit member 17 is disposed on the push rod 16. In this embodiment, the limit groove 18 is a dovetail groove, and the limit member 17 is a dovetail boss. The push rod 16 includes a support frame 19, and the longitudinal section of the support frame 19 is triangular. A connecting plate 20 is provided at one end of the support frame 19, and a reinforcing rib 21 is provided at the connection between the connecting plate 20 and the support frame 19. The reinforcing rib 21 serves to support the connection, making the connection between the support frame 19 and the connecting plate 20 more stable. Two inclined surfaces 28 are symmetrically provided on the end of the connecting plate 20 away from the support frame 19. The inclined surfaces 28 are smooth inclined surfaces. When the armature 10 moves from the first position to the second position, the inclined surfaces 28 on the push rod 16 contact the rolling wheel 24 on the rocker arm 23 in the auxiliary contact device 22, generating rolling friction and transmitting the on / off signal of the auxiliary contact device 22. Since the limiting member 17 is embedded in the limiting groove 18 on the base 15 and fits tightly with the limiting groove 18, the push rod 16 will not produce relative displacement due to the force applied to the inclined surface 28 on the push rod 16, thereby ensuring the reliability and stability of the auxiliary contact device 22 when the DC contactor is in operation.

[0058] As an alternative embodiment, the limiting groove 18 is provided on the push rod 16 , and the limiting member 17 is provided on the base 15 .

[0059] The specific operating process is as follows: When the DC contactor is energized, coil 27 generates electromagnetic force, attracting armature 10 from its second position to its first position, thereby driving base 15 toward the auxiliary contact system, thereby conducting electrical signals. When the DC contactor is de-energized, armature 10, under the action of reaction spring 25, rapidly moves from its first position to its second position, impacting the buffer system. This allows buffer 5 to effectively absorb the kinetic energy released by the armature 10 from its first position to its second position.

[0060] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A DC contactor, characterized in that: include: A buffer system, an electromagnetic system, an auxiliary contact system and a limit structure, wherein the electromagnetic system comprises an armature (10), an iron core (11), a demagnetizing sheet (12) and a magnetic yoke (14) arranged in sequence along a vertical direction, a coil (27) is sleeved on the outer peripheral wall of the iron core (11), and the demagnetizing sheet (12) is arranged between the iron core (11) and the magnetic yoke (14); The auxiliary contact system comprises a push rod (16) and an auxiliary contact device (22); the base (15) is arranged on the armature (10); the push rod (16) is arranged on the base (15) and is fixedly connected to the base (15); the auxiliary contact device (22) is arranged below the base (15); when the armature (10) moves from the second position to the first position, the push rod (16) abuts against the auxiliary contact device (22) to transmit an electrical signal; The buffer system comprises a positioning member (9), a stop member (1) and a buffer member (5); the positioning member (9) passes through the armature (10) in a vertical direction and is fixed on the iron core (11); the armature (10) has a first position when it is attracted to the iron core (11), and a second position when the armature (10) is disconnected from the iron core (11) and contacts the buffer member (5); the stop member (1) is arranged on the positioning member (9), and the buffer member (5) is arranged between the stop member (1) and the armature. The buffer member (5) is used to absorb the kinetic energy released when the armature (10) moves from the first position to the second position. The buffer member (5) has a first surface (6) in contact with the stop member (1) and a second surface (7) in contact with the armature (10). The angle formed by the second surface (7) and the plane where the iron core (11) is located is consistent with the angle formed by the plane when the armature (10) is in the second position and the plane where the iron core (11) is located. The limiting structure comprises a limiting member (17) and a limiting groove (18), wherein the limiting member (17) is provided on the push rod (16), and the limiting groove (18) is provided on the base (15) and is suitable for the limiting member (17) to be inserted so as to limit the movement of the push rod (16) relative to the base (15).

2. The DC contactor according to claim 1, characterized in that: The included angle between the first surface (6) and the second surface (7) is an acute angle.

3. The DC contactor according to claim 1, characterized in that: It also includes a convex block (8) arranged on the first surface (6) for fixing the buffer member (5), and the convex block (8) is fixedly connected to the stop member (1).

4. The DC contactor according to claim 3, characterized in that: The projection (8) is mushroom-shaped.

5. The DC contactor according to any one of claims 1 to 4, characterized in that: The buffer member (5) is made of rubber material.

6. The DC contactor according to claim 5, characterized in that: The stopper (1) comprises: A fixed plate (2) is U-shaped; Two mounting holes (3) are symmetrically provided on the fixing plate (2) and are used for mounting the buffer member (5); A connecting hole (4) is provided between the two mounting holes (3), and the stopper (1) is detachably connected to the positioning member (9) through the connecting hole (4).

7. The DC contactor according to claim 1, characterized in that: The push rod (16) comprises: A support frame (19), the limiting member (17) or the limiting groove (18) is arranged on the support frame (19), and the longitudinal section of the support frame (19) is triangular; A connecting plate (20) is provided at one end of the support frame (19), and a reinforcing rib (21) is provided at the connection between the connecting plate (20) and the support frame (19).

8. The DC contactor according to claim 7, characterized in that: Two inclined surfaces (28) are symmetrically provided on the end of the connecting plate (20) away from the supporting frame (19).

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