A contactor with phase sequence switching function

Abstract

A contactor with a phase sequence switching function controls the direction of the armature by controlling the power on and off conditions of the two iron cores. At the same time, since the phase sequence of the three upper main contact copper sheets on one side is A, C, B or B, A, C or C, B, A, relative to the phase sequence of the three upper main contact copper sheets on the other side, A, B, C, any two phase sequence positions are swapped. Therefore, the phase sequence switching function can be achieved in the same contactor by controlling the forward and reverse swing of the armature, thereby realizing the forward and reverse rotation of the three-phase motor; since the forward and reverse rotation of the three-phase motor can be achieved through one contactor, the occupation of the three-phase motor control cabinet can be greatly reduced; in addition, the forward and reverse rotation of the armature can be directly controlled by the coil iron core, which can also play the same function as the electrical interlocking circuit, avoiding the addition of the electrical interlocking circuit, and further improving the space utilization rate of the three-phase motor control cabinet. The contactor has a simple structure, low cost, and convenient later maintenance.

Description

Technical Field

[0001] The invention relates to a contactor with a phase sequence switching function. Background Art

[0002] In the existing electrical circuit, the forward and reverse rotation of the three-phase motor is realized through the three-phase sequence of A, B, and C. At present, the motor forward and reverse circuit composed of two contactors is widely used in the industry. The forward and reverse rotation of the motor is realized by connecting two ordinary contactors in the electrical circuit. However, two ordinary contactors are set in the electrical circuit, which takes up a lot of space in the three-phase motor control cabinet. At the same time, in order to avoid mutual interference between the two contactors during operation, an additional electrical interlocking circuit is required in the electrical circuit. Due to the addition of the electrical interlocking circuit, not only the space of the three-phase motor control cabinet is further occupied, but also the cumbersome work of electrical wiring is correspondingly increased, which is not convenient for the maintenance of the three-phase motor. Summary of the invention

[0003] The present invention aims to provide a contactor with a simple structure and a phase sequence switching function.

[0004] A contactor with a phase sequence switching function described in the present invention comprises a shell, an armature rotatable relative to the shell is installed inside the shell, iron cores with coils are respectively installed on the shell side walls on both sides of the armature, three upper main contact copper sheets at the top and three lower main contact copper sheets at the bottom are arranged between the iron core and the armature on each side, and an intermediate contact copper sheet that can connect the three upper main contact copper sheets and the three lower main contact copper sheets on the same side is also arranged on the armature, wherein the phase sequence of the three upper main contact copper sheets on one side is A, B, C, and the phase sequence of the three upper main contact copper sheets on the other side is A, C, B or B, A, C or C, B, A. When the iron core on one side of the three upper main contact copper sheets with a phase sequence of A, B, and C is energized, the armature rotates toward that side, so that the middle contact copper sheet contacts the three upper main contact copper sheets and the three lower main contact copper sheets on that side at the same time, connecting the upper main contact copper sheets and the lower main contact copper sheets on that side, and the motor rotates forward at this time; when the iron core on one side of the three upper main contact copper sheets with a phase sequence of A, C, B or B, A, C or C, B, A is energized, the armature rotates toward that side, so that the middle contact copper sheet contacts the three upper main contact copper sheets and the three lower main contact copper sheets on that side at the same time, connecting the upper main contact copper sheets and the lower main contact copper sheets on that side, and the motor reverses at this time.

[0005] The contactor with the phase sequence switching function described in the present invention controls the direction of the armature by controlling the power-on and power-off conditions of the two iron cores. At the same time, since the phase sequence of the three upper main contact copper sheets on one side is A, C, B or B, A, C or C, B, A, relative to the phase sequence A, B, C of the three upper main contact copper sheets on the other side, any two phase sequence positions are swapped. Therefore, the phase sequence switching function can be realized in the same contactor by controlling the forward and reverse rotation of the armature, thereby realizing the forward and reverse rotation of the three-phase motor; since the phase sequence of the three upper main contact copper sheets on one side is A, C, B or B, A, the phase sequence of the three upper main contact copper sheets on the other side is A, B, C, which is formed by swapping any two phase sequence positions. A contactor can realize the forward and reverse rotation of the three-phase motor, thus greatly reducing the space occupied by the three-phase motor control cabinet; in addition, by directly controlling the forward and reverse rotation of the armature through the coil core, not only can the contactor work with higher accuracy, but also play the same function as the electrical interlocking circuit, avoiding the addition of the electrical interlocking circuit, further improving the space utilization of the three-phase motor control cabinet; in addition, by setting the intermediate contact copper sheet, the impact generated during the direct contact between the upper main contact copper sheet and the lower main contact copper sheet can be effectively avoided, thereby affecting the service life of the contactor. The contactor has a simple structure, low cost, and convenient later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the assembly structure of the present invention.

[0007] Figure 2 It is a schematic diagram of the decomposition of the present invention.

[0008] Figure 3 The figure is a schematic diagram of the installation structure of the main contact copper sheet of the present invention.

[0009] Figure 4 This is a schematic diagram of the installation structure of the lower main contact copper sheet of the present invention.

[0010] Figure 5 Schematic diagram of the connection structure of the middle contact copper sheet. DETAILED DESCRIPTION

[0011] A contactor with a phase sequence switching function, such as Figure 1 and Figure 2As shown, it includes a shell 1, an armature 2 is installed inside the shell 1 and can rotate relative to the shell 1, and iron cores 3 with coils are respectively installed on the side walls of the shell 1 on both sides of the armature 2. Three upper main contact copper sheets 4 and three lower main contact copper sheets 5 are arranged between the iron core 3 and the armature 2 on each side. An intermediate contact copper sheet 6 that can connect the three upper main contact copper sheets 4 and the three lower main contact copper sheets 5 on the same side is also arranged on the armature 2. The phase sequence of the three upper main contact copper sheets 4 on one side is A, B, C, and the phase sequence of the three upper main contact copper sheets 4 on the other side is A, C, B or B, A, C or C, B, A. In the phase sequence of A, When the iron core 3 on one side of the three upper main contact copper sheets 4 of B and C is energized, the armature 2 rotates toward that side, so that the middle contact copper sheet 6 contacts the three upper main contact copper sheets 4 and the three lower main contact copper sheets 5 on that side at the same time, and the upper main contact copper sheets 4 and the lower main contact copper sheets 5 on that side are connected, and the motor rotates forward at this time; when the iron core 3 on one side of the three upper main contact copper sheets 4 with a phase sequence of A, C, B or B, A, C or C, B, A is energized, the armature 2 rotates toward that side, so that the middle contact copper sheet 6 contacts the three upper main contact copper sheets 4 and the three lower main contact copper sheets 5 on that side at the same time, and the upper main contact copper sheets 4 and the lower main contact copper sheets 5 on that side are connected, and the motor rotates reversely at this time. The phase sequence of the three upper main contact copper sheets 4 on the other side is preferably A, C, B, and the connection is more convenient.

[0012] like Figure 3 and Figure 4As shown, the upper main contact copper sheets 4 on both sides are mounted on the top seat 7, which is mounted on the top surface inside the shell 1, and the lower main contact copper sheets 5 on both sides are mounted on the base 8, which is mounted on the bottom surface inside the shell 1; the top seat 7 and the base 8 are formed by overlapping and stacking two concave mounting seats, and three continuous grooves 9 consistent with the shape of the mounting seats are arranged on the overlapping surface of the mounting seats on the inner side, and two upper and lower rows of through holes 10 are arranged on one side wall of the mounting seat on the outer side, and the number of through holes 10 in each row is three; the upper main contact copper sheet 4 and the lower main contact copper sheet 5 are both L-shaped; one side of the three upper main contact copper sheets 4 with phase sequence A, B, and C is embedded in the groove 9 on one side wall of the mounting seat on the inner side of the top seat 7, and the other side thereof is penetrated by a row of through holes 10 on the side wall of the mounting seat on the outer side away from the bottom surface of the groove 9, and the three lower main contact copper sheets 5 on the same side are L-shaped. One edge of the base 8 is embedded in the groove 9 on one side wall of the inner mounting seat, and the other edge thereof is penetrated by a row of through holes 10 on the side wall of the outer mounting seat close to the bottom surface of the groove 9; one edge of the three upper main contact copper sheets 4 with a phase sequence of A, C, B or B, A, C or C, B, A is embedded in the groove 9 on the other side wall of the inner mounting seat of the top seat 7, and the other edge thereof is penetrated by a row of through holes 10 on the side wall of the outer mounting seat close to the bottom surface of the groove 9, and one edge of the three lower main contact copper sheets 5 on the same side is embedded in the groove 9 on the other side wall of the inner mounting seat of the base 8, and the other edge thereof is penetrated by a row of through holes 10 on the side wall of the outer mounting seat away from the bottom surface of the groove 9; the portions of the upper main contact copper sheets 4 on both sides embedded in the groove 9 extend downwardly beyond the groove 9, and the portions of the lower main contact copper sheets 5 on both sides embedded in the groove 9 extend upwardly beyond the groove 9. The top seat 7 and the base 8 are used to fix two groups of upper main contact copper sheets 4 and two groups of lower main contact copper sheets 5, so as to achieve the effect of phase sequence change in one contactor.

[0013] The portions of the upper main contact copper sheets 4 extending out of the groove 9 on both sides are bent toward the armature 2, and the portions of the lower main contact copper sheets 5 extending out of the groove 9 on both sides are bent toward the iron core 3, and the bent portions of the upper main contact copper sheets 4 on the same side are aligned obliquely with the bent portions of the lower main contact copper sheets 5. Since the bent portions of the upper main contact copper sheets 4 on the same side are aligned obliquely with the bent portions of the lower main contact copper sheets 5, a plane is formed, which is convenient for contacting with the middle contact copper sheet 6 on the armature 2.

[0014] A raised first spherical surface 11 is provided on the bent parts of the upper main contact copper sheets 4 on both sides and on the bent parts of the lower main contact copper sheets 5 on both sides, and two second spherical surfaces 12 are provided on the middle contact copper sheets 6 on both sides. When the middle contact copper sheet 6 rotates with the armature 2, one second spherical surface 12 on the middle contact copper sheet 6 contacts the first spherical surface 11 on the upper main contact copper sheet 4 on the same side, and the other second spherical surface 12 contacts the first spherical surface 11 on the lower main contact copper sheet 5 on the same side, so as to connect the upper main contact copper sheet 4 and the lower main contact copper sheet 5 on the same side, thereby realizing the forward and reverse rotation of the three-phase motor; at the same time, since the upper main contact copper sheet 4 and the middle contact copper sheet 6 as well as the lower main contact copper sheet 5 and the middle contact copper sheet 6 are in contact through the spherical surface, the contact area between the two is greatly reduced, and the arc quenching part formed by the raised spherical surface can also greatly improve the safety performance of the contactor.

[0015] The armature 2 is connected to the housing 1 via a rotating shaft. The armature is Y-shaped. One side of the Y-shaped armature 2 extends into a groove 21 of the mounting seat on the inner side of the base 8. Intermediate contact copper sheets 6 are respectively provided on the other two adjacent sides of the Y-shaped armature 2. By providing the Y-shaped armature 2, the intermediate contact copper sheet 6 thereon can return to the intermediate equilibrium position more quickly during the swinging process of the Y-shaped armature 2.

[0016] like Figure 2 and Figure 5 As shown, three mounting grooves 13 are respectively provided on two adjacent sides of the Y-shaped armature 2 provided with the intermediate contact copper sheet 6, a spring 14 is installed in the mounting groove 13 on each side, and the free end of the spring 14 protrudes out of the mounting groove 13, and an insertion rod 15 is provided on the side of the intermediate contact copper sheet 6 on both sides facing the mounting groove 13, the insertion rod 15 on the intermediate contact copper sheet 6 is inserted into the free end of the spring 14 in the corresponding mounting groove 13, and the intermediate contact copper sheet 6 is installed on the Y-shaped armature 2 through the spring 14. During the operation of the contactor, the spring 14 can buffer the impact force when the upper main contact copper sheet 4 and the lower main contact copper sheet 5 contact the middle contact copper sheet 6 respectively. In addition, during the operation of the contactor, if the upper main contact copper sheet 4 or the lower main contact copper sheet 5 is slightly deformed, at this time, during the operation of the Y-shaped armature 2, there may be gaps in the contact process between the upper main contact copper sheet 4 and the lower main contact copper sheet 5 and the middle contact copper sheet 6 respectively, and they cannot be fully in contact. The deformation of the spring 14 is used to ensure that there is no gap in the contact, and the contact is tighter, which effectively prevents the upper main contact copper sheet 4 and the lower main contact copper sheet 5 from being disconnected when connected to the middle contact copper sheet 6 due to external vibration, thereby improving the reliability of the contactor during operation.

[0017] An arc-shaped strip-shaped through hole 16 is arranged on the columnar end face of the Y-type armature 2, and an arc-shaped strip-shaped protrusion 17 corresponding to the strip-shaped through hole 16 is arranged on the inner wall of the housing 1, the arc length of the strip-shaped protrusion 17 is smaller than the arc length of the strip-shaped through hole 16, and the strip-shaped protrusion 17 extends into the corresponding strip-shaped through hole 16. During the swinging process of the Y-type armature 2, the strip-shaped protrusion 17 will move relative to the strip-shaped through hole 16 on the Y-type armature 2, and when any end of the strip-shaped protrusion 17 contacts the corresponding end of the strip-shaped through hole 16, the Y-type armature 2 stops swinging or swings in the opposite direction, and the cooperation of the strip-shaped through hole 16 and the strip-shaped protrusion 17 plays a role in limiting the excessive rotation angle of the Y-type armature 2 at the moment of attraction, and further avoiding the upper main contact copper sheet 4 and the lower main contact copper sheet 5 from generating a large impact force with the middle contact copper sheet 6 respectively.

[0018] The two cores 3 are respectively mounted on the vertical side walls inside the housing 1 through the triangular core mounting seats 18 on both sides. A plurality of slots 19 are arranged at intervals on the side of the two core mounting seats 18 facing the housing 1. The vertical side walls inside the housing 1 are provided with plug-in plates 20 having the same number as the slots 19. The plug-in plates 20 are inserted into the corresponding slots 19 to mount the core mounting seats 18 on the housing 1. The connection structure between the slots 19 and the plug-in plates 20 facilitates the installation and removal of the core mounting seats 18.

[0019] The iron core 3 is in an E shape, and the coil is wound on a side in the middle of the iron core 3 .

[0020] The directional indications (such as top surface, bottom surface, etc.) involved in the present invention are only used to explain the contactor in the following Figure 1 The relative position relationship between the components in a certain state, if the specific state changes, the directional indication will also change accordingly.

Claims

1. A contactor with a phase sequence switching function, characterized in that: The invention comprises a housing (1), an armature (2) rotatable relative to the housing (1) being mounted inside the housing (1), an iron core (3) wound with a coil being mounted on the side walls of the housing (1) on both sides of the armature (2), three upper main contact copper sheets (4) being located above and three lower main contact copper sheets (5) being located below being arranged between the iron core (3) and the armature (2) on each side, an intermediate contact copper sheet (6) being arranged on the armature (2) for connecting the three upper main contact copper sheets (4) and the three lower main contact copper sheets (5) on the same side, wherein the phase sequence of the three upper main contact copper sheets (4) on one side is A, B, C, and the phase sequence of the three upper main contact copper sheets (4) on the other side is A, C, B or B, A, C or C, B, A, and the armature (2) is Y-shaped, and on the other two adjacent sides of the Y-shaped armature (2) Intermediate contact copper sheets (6) are respectively provided. When the iron core (3) on one side of the three upper main contact copper sheets (4) of the phase sequence A, B, and C is energized, the armature (2) rotates toward that side, so that the intermediate contact copper sheet (6) is in contact with the three upper main contact copper sheets (4) and the three lower main contact copper sheets (5) on that side at the same time, and the upper main contact copper sheets (4) and the lower main contact copper sheets (5) on that side are connected. At this time, the motor rotates forward. When the iron core (3) on one side of the three upper main contact copper sheets (4) of the phase sequence A, C, B or B, A, C or C, B, A is energized, the armature (2) rotates toward that side, so that the intermediate contact copper sheet (6) is in contact with the three upper main contact copper sheets (4) and the three lower main contact copper sheets (5) on that side at the same time, and the upper main contact copper sheets (4) and the lower main contact copper sheets (5) on that side are connected. At this time, the motor rotates reversely.

2. A contactor with a phase sequence switching function according to claim 1, characterized in that: The phase sequence of the three upper main contact copper sheets (4) on the other side is A, C, B.

3. A contactor with a phase sequence switching function according to claim 1, characterized in that: The upper main contact copper sheets (4) on both sides are mounted on a top seat (7), which is mounted on the top surface of the housing (1); the lower main contact copper sheets (5) on both sides are mounted on a base (8), which is mounted on the bottom surface of the housing (1); the top seat (7) and the base (8) are formed by overlapping and stacking two concave-shaped mounting seats, and three continuous grooves (9) having the same shape as the mounting seats are provided on the overlapping surface of the mounting seat on the inner side, and three continuous grooves (9) having the same shape as the mounting seats are provided on one side of the mounting seat on the outer side. Two rows of through holes (10) are arranged on the wall, each row of through holes (10) has three through holes; the upper main contact copper sheet (4) and the lower main contact copper sheet (5) are both L-shaped; one edge of the three upper main contact copper sheets (4) with a phase sequence of A, B, and C is embedded in a groove (9) on one side wall of the inner mounting seat of the top seat (7), and the other edge thereof is passed through a row of through holes (10) on the side wall of the outer mounting seat away from the bottom surface of the groove (9); the three lower main contact copper sheets (5) on the same side are One edge is embedded in a groove (9) on one side wall of the inner mounting seat of the base (8), and the other edge thereof is penetrated by a row of through holes (10) on the side wall of the outer mounting seat near the bottom surface of the groove (9); one edge of three upper main contact copper sheets (4) with a phase sequence of A, C, B or B, A, C or C, B, A is embedded in a groove (9) on the other side wall of the inner mounting seat of the top seat (7), and the other edge thereof is penetrated by a row of through holes (10) on the side wall of the outer mounting seat near the bottom surface of the groove (9). A row of through holes (10) are passed through, one side of the three lower main contact copper sheets (5) on the same side is embedded in the groove (9) on the other side wall of the mounting seat on the inner side of the base (8), and the other side thereof is passed through a row of through holes (10) on the side wall of the mounting seat on the outer side and away from the bottom surface of the groove (9); the portions of the upper main contact copper sheets (4) on both sides embedded in the groove (9) extend downwardly out of the groove (9), and the portions of the lower main contact copper sheets (5) on both sides embedded in the groove (9) extend upwardly out of the groove (9).

4. A contactor with a phase sequence switching function according to claim 3, characterized in that: The portions of the upper main contact copper sheets (4) extending out of the grooves (9) on both sides are bent toward the armature (2), and the portions of the lower main contact copper sheets (5) extending out of the grooves (9) on both sides are bent toward the iron core (3), and the bent portions of the upper main contact copper sheets (4) and the bent portions of the lower main contact copper sheets (5) on the same side are aligned obliquely upward.

5. A contactor with a phase sequence switching function according to claim 4, characterized in that: A raised first spherical surface (11) is provided on the bent parts of the upper main contact copper sheets (4) on both sides and on the bent parts of the lower main contact copper sheets (5) on both sides, and two second spherical surfaces (12) are provided on the middle contact copper sheets (6) on both sides. When the middle contact copper sheets (6) rotate with the armature (2), one second spherical surface (12) on the middle contact copper sheet (6) contacts the first spherical surface (11) on the upper main contact copper sheet (4) on the same side, and the other second spherical surface (12) contacts the first spherical surface (11) on the lower main contact copper sheet (5) on the same side, so as to connect the upper main contact copper sheet (4) and the lower main contact copper sheet (5) on the same side.

6. A contactor with a phase sequence switching function according to claim 1, characterized in that: The armature (2) is connected to the housing (1) via a rotating shaft. The armature (2) is Y-shaped. One side of the Y-shaped armature (2) extends into a groove (21) of a mounting seat located on the inner side of the base (8). Intermediate contact copper sheets (6) are respectively provided on the other two adjacent sides of the Y-shaped armature (2).

7. A contactor with a phase sequence switching function according to claim 6, characterized in that: Three mounting grooves (13) are respectively arranged on two adjacent sides of a Y-shaped armature (2) provided with an intermediate contact copper sheet (6), a spring (14) is installed in the mounting groove (13) on each side, and the free end of the spring (14) protrudes out of the mounting groove (13), and an insertion rod (15) is arranged on the side of the intermediate contact copper sheet (6) on both sides facing the mounting groove (13), and the insertion rod (15) on the intermediate contact copper sheet (6) is inserted into the free end of the spring (14) in the corresponding mounting groove (13), and the intermediate contact copper sheet (6) is installed on the Y-shaped armature (2) through the spring (14).

8. A contactor with a phase sequence switching function according to claim 6 or 7, characterized in that: An arc-shaped strip-shaped through hole (16) is arranged on the columnar end face of the Y-shaped armature (2), and an arc-shaped strip-shaped protrusion (17) corresponding to the strip-shaped through hole (16) is arranged on the inner wall of the housing (1), wherein the arc length of the strip-shaped protrusion (17) is smaller than the arc length of the strip-shaped through hole (16), and the strip-shaped protrusion (17) extends into the corresponding strip-shaped through hole (16).

9. A contactor with a phase sequence switching function according to claim 1, characterized in that: The two iron cores (3) are respectively mounted on the vertical side walls inside the housing (1) via triangular iron core mounting seats (18) on both sides; a plurality of slots (19) are arranged at intervals on the surface of the two iron core mounting seats (18) facing the housing (1); and plug plates (20) having the same number as the slots (19) are arranged on the vertical side walls inside the housing (1); the plug plates (20) are inserted into corresponding slots (19) to mount the iron core mounting seats (18) on the housing (1).

10. A contactor with a phase sequence switching function according to claim 1 or 9, characterized in that: The iron core (3) is in an E-shape, and the coil is wound on a middle side of the iron core (3).

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