Intelligent control device for soft start of three-phase alternating-current voltage bypass type motor

Abstract

The invention relates to a three-phase AC voltage bypass type motor soft start intelligent control device, which comprises a shell, a control box arranged in the shell and three groups of driving assemblies, and is characterized in that each driving assembly comprises a bypass switch, an incoming line bar, an outgoing line bar, a current transformer, a radiator and a thyristor, the current transformer is arranged on the outgoing line bar and is used for detecting current, and the radiator is arranged on the bypass switch. Two terminals of the bypass switch are electrically connected with the wire inlet bar and the wire outlet bar, the radiator is connected with the bypass switch in parallel, the thyristor is connected in the radiator in series, and the control box is electrically connected with the bypass switch, the current transformer and the thyristor. According to the intelligent control device for soft start of the three-phase alternating-current voltage motor with the bypass, the bypass switch is integrated into the soft starter, the overall structure is compact, the occupied space and the production cost are saved, and assembly and maintenance are more convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of soft starters, and in particular relates to a three-phase AC voltage self-contained bypass type motor soft start intelligent control device. Background Art

[0002] A soft starter is a motor control device that integrates motor soft starting, soft stopping, light load energy saving and multiple protection functions. Its main components are a circuit board, a current transformer and a three-phase thyristor drive assembly. The current transformer is located on the three-phase thyristor drive assembly and connected to the circuit board, and the circuit board is connected to the three-phase thyristor drive assembly.

[0003] General soft starters use external bypass, which not only increases the cost, but also expands the size of the electric control cabinet. At the same time, it has large resistance, high noise, and high power consumption. During its operation, its internal components will generate heat and cause component wear, and there will be electromagnetic pollution and heat radiation. In addition, it is troublesome to install and maintain. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a three-phase AC voltage self-bypass type motor soft starting intelligent control device to address the deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A three-phase AC voltage self-contained bypass type motor soft start intelligent control device comprises a shell, a control box arranged in the shell and three groups of drive components, the drive components comprising a bypass switch, an incoming line bar, an outgoing line bar, a current transformer, a radiator and a thyristor, the current transformer is arranged on the outgoing line bar for detecting current, two terminals of the bypass switch are electrically connected to the incoming line bar and the outgoing line bar, the radiator is connected in parallel with the bypass switch, the thyristor is connected in series in the radiator, and the control box is electrically connected to the bypass switch, the current transformer and the thyristor.

[0007] In order to better implement the present invention, further optimization is made in the above structure, and multiple bypass switches are arranged in parallel.

[0008] In order to better realize the present invention, further optimization is made in the above structure, all bypass switches in each group of drive components are arranged in parallel, and the two terminal blocks of each group of all bypass switches are connected in parallel through two wiring blocks, and the two wiring blocks are fixedly connected to the incoming line block and the outgoing line block by bolts.

[0009] In order to better implement the present invention, further optimization is made in the above structure, and the radiator is connected in parallel with the bypass switch through a connecting row.

[0010] In order to better implement the present invention, further optimization is made in the above structure, the radiator includes an upper radiator and a lower radiator, and the thyristor is connected in series between the upper radiator and the lower radiator.

[0011] In order to better realize the present invention, further optimization is made in the above structure, and the incoming wire rows in the three groups of drive components are all arranged on insulating support rods, and the insulating support rods are fixed to the housing by bolts.

[0012] In order to better realize the present invention, further optimization is made in the above structure. A mounting bracket is also provided in the drive assembly, the radiator is fixed on the mounting bracket, an insulator is provided at the bottom of the mounting bracket, and the incoming line row and the outgoing line row are extended to the outside of the shell through an insulating sheath.

[0013] In order to better implement the present invention, further optimization is made in the above structure, three groups of drive components are arranged side by side, and an insulating plate is arranged on the outside of each group of drive components.

[0014] In order to better realize the present invention, further optimization is made in the above structure. A temperature sensor and a temperature-controlled fan are also provided in each group of driving components. The temperature sensor and the temperature-controlled fan are electrically connected to the control box. The control box controls the temperature-controlled fan through the signal of the temperature sensor.

[0015] In order to better realize the present invention, further optimization is made in the above structure. A circuit control board is arranged in the control box, and an insulating mounting plate is arranged at the bottom of the circuit control board.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The three-phase AC voltage self-contained bypass type motor soft start intelligent control device provided by the present invention integrates the bypass switch into the soft starter, and the overall structure is compact, which saves space and production costs, and is more convenient to assemble and maintain.

[0018] 2. The present invention uses multiple bypass switches in parallel to expand the rated current, so that the soft starter can use multiple small-capacity bypass switches to handle larger current loads, thereby saving costs and space, and meeting the current carrying requirements while ensuring the safe operation of the circuit. A series of insulation protection devices are set to improve the insulation performance of the entire soft starter, and at the same time, insulators and insulating sheaths are used to greatly reduce the vibration amplitude of the device when it is started due to large currents, thereby reducing noise. The insulation plates set on the outside of each set of drive components are used to form independent air ducts, and the use of temperature-controlled fans enhances the heat dissipation capacity of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the external structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the connection structure of three groups of drive components in the present invention;

[0023] Figure 4 It is a schematic diagram of the connection structure of a single drive component in the present invention;

[0024] Figure 5 It is a schematic diagram of the connection structure when two bypass switches in the drive assembly of the present invention are connected in parallel;

[0025] Figure 6 It is a schematic diagram of the connection structure when three bypass switches in the drive assembly of the present invention are connected in parallel;

[0026] Figure 7 It is a circuit schematic diagram of the present invention.

[0027] In the figure:

[0028] 1-housing, 2-control box, 3-circuit control board, 4-drive assembly, 401-bypass switch, 402-incoming line bar, 403-outgoing line bar, 404-current transformer, 405-radiator, 406-thyristor, 407-wiring bar, 408-connecting bar, 409-insulating support rod, 410-mounting bracket, 411-insulator, 412-insulating sheath, 413-temperature sensor, 414-temperature control fan, 5-insulating board, 6-insulating mounting board. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "plurality" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Embodiment 1:

[0033] Reference Figure 1-Figure 4 The three-phase AC voltage self-contained bypass type motor soft start intelligent control device provided by the present invention comprises a housing 1, a control box 2 arranged in the housing 1 and three sets of drive components 4, wherein the drive component 4 comprises a bypass switch 401, an incoming line row 402, an outgoing line row 403, a current transformer 404, a heat sink 405 and a thyristor 406, wherein the bypass switch 401 is a single-phase sealed structure, which is easy to install and does not produce arcing, making the entire device safer and more reliable. The current transformer 404 is arranged on the outgoing line row 403 for detecting current, the two terminals of the bypass switch 401 are electrically connected to the incoming line row 402 and the outgoing line row 403, the heat sink 405 is connected in parallel with the bypass switch 401, the thyristor 406 is connected in series in the heat sink 405, and the control box 2 is electrically connected to the bypass switch 401, the current transformer 404 and the thyristor 406. The present invention integrates the bypass switch 401 into the interior of the soft starter, so that the overall structure is compact, the space occupied and the production cost are saved, and the assembly and maintenance are more convenient.

[0034] During operation, the bypass switch 401 is first disconnected, so that the current passes through the heat sink 405 and the thyristor 406 from the incoming line row 402 in sequence, and finally reaches the outgoing line row 403. The thyristor 406 is used to gradually increase the current to avoid excessive starting current. When the motor is started, the bypass switch 401 connects the main line again, thereby completing the smooth start of the motor.

[0035] The heat sink 405 is connected in parallel with the bypass switch 401 through the connecting row 408. The connecting row 408, the bypass switch 401 and the incoming line row 402 (outgoing line row 403) are connected together. The current flowing in from the incoming line row 402 can flow from the branch of the bypass switch 401 or the branch of the connecting row 408 respectively.

[0036] The heat sink 405 includes an upper heat sink and a lower heat sink, and the thyristor 406 is connected in series between the upper heat sink and the lower heat sink, providing efficient heat dissipation for the thyristor 406 to prevent the circuit from overheating.

[0037] The incoming line rows 402 in the three drive components 4 are all arranged on insulating support rods 409, and the insulating support rods 409 are fixed to the housing 1 by bolts, so that the three drive components 4 can be firmly fixed to the housing 1 while having good insulation performance.

[0038] A mounting bracket 410 is also provided in the drive assembly 4, and the heat sink 405 is fixedly provided on the mounting bracket 410. An insulator 411 is provided at the bottom of the mounting bracket, and both the incoming line row 402 and the outgoing line row 403 extend to the outside of the housing 1 through the insulating sheath 412. The use of the insulator 411 and the insulating sheath 412 not only improves the insulation performance of the entire soft starter, but also greatly reduces the vibration amplitude of the device when it is started due to a large current, thereby reducing noise.

[0039] The three groups of drive components 4 are arranged side by side, and an insulating plate 5 is arranged on the outside of each group of drive components 4 to improve the insulation performance of each group of drive components 4. At the same time, the insulating plate 5 on the outside of each group of drive components 4 is used as an air duct, and a temperature sensor 413 and a temperature control fan 414 are also arranged in each group of drive components 4. When the temperature control fan 414 is started, it can provide heat dissipation for each group of drive components 4 separately, thereby enhancing the heat dissipation capacity of the device. The temperature sensor 413 and the temperature control fan 414 are both electrically connected to the control box 2, and the control box 2 controls the temperature control fan 414 through the signal of the temperature sensor 413, thereby ensuring the accuracy of the temperature control of the single group of drive components 4. When in use, the temperature control fan 414 does not start when the device is in standby mode. When the device is running, when the temperature of the radiator 405 is higher than 35 degrees, the fan starts, and when the temperature drops below 35 degrees, the fan stops. When the temperature of the radiator 405 is higher than 60 degrees, the device reports a high temperature fault, the device stops, and the fan stops. When the temperature reaches 85 degrees, the fan stops after running for another 10 minutes.

[0040] Embodiment 2:

[0041] Reference Figure 5 and Figure 6, the difference between this embodiment 2 and embodiment 1 is that: multiple bypass switches 401 are set in parallel. The present invention adopts a method of connecting multiple bypass switches in parallel to expand the rated current, and its current carrying capacity gradually increases according to the number of bypass switches 401 connected in parallel. For example, in a motor soft starter with a three-phase AC voltage of 400V, the applicable range of a single sealed bypass switch is 45A-300A; the two-stage parallel sealed bypass switch is applicable to 390A, 480A and 580A; the three-stage parallel sealed bypass switch is applicable to 780A and 960A. The soft starter can use multiple small-capacity bypass switches to handle larger current loads, thereby saving costs and space, and meeting the current carrying requirements while ensuring the safe operation of the circuit. The current transformer 404 arranged on the outlet row 403 is used to detect the current to determine the working condition of the bypass switch 401.

[0042] All bypass switches 401 in each group of drive components 4 are arranged in parallel, and the two wiring terminals of all bypass switches 401 in each group are connected in parallel through two wiring blocks 407, and the two wiring blocks are fixedly connected to the incoming line block 402 and the outgoing line block 403 by bolts. The parallel arrangement can easily connect the wiring blocks to all bypass switches 401 to prevent loose wiring and virtual connection. This not only improves the connection efficiency, but also indirectly connects and fixes all bypass switches 401 together, thereby improving the structural strength of the soft starter.

[0043] Embodiment 3:

[0044] like Figure 2 As shown, a circuit control board 3 is arranged in the control box 2, and an insulating mounting plate 6 is arranged at the bottom of the circuit control board 3 to ensure the safety of the circuit control board 3. The present invention controls the normal operation of the entire device through the circuit control board 3.

[0045] Reference Figure 7, the circuit schematic diagram provided by the present invention, the bypass switch 401 of the present invention adopts a dual-coil control mode, and the characteristics of the dual-coil control mode are: the pull-in current is large and the holding current is small. The contactor often generates a large pull-in current at the moment of pull-in, especially multiple contactors used in parallel will generate a huge impact current at the moment of pull-in. The impact of this impact current on the power supply is large and may cause circuit instability. In order to meet the needs of large impact currents, the stability, dynamic response, and heavy-load regulation characteristics of the power supply are often required to be high. Ordinary power supplies cannot meet the requirements. The use of a larger power supply design will lead to complex design and high cost. Based on the difficulty of design and cost considerations, the present invention adopts a circuit control board 3 as a super-capacitor design. The super-capacitor has the characteristics of simple design, good stability, high impact resistance, low cost, etc. The super-capacitor is mainly composed of multiple supercapacitors in series, plus some balancing circuits and protection circuits, which can meet the requirements of multiple contactors working in parallel at the same time. At the same time, supercapacitors of different sizes and capacitances can be replaced according to the actual number of contactors used, so as to achieve the optimal configuration.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A three-phase AC voltage self-bypass type motor soft start intelligent control device, comprising a housing (1), a control box (2) arranged in the housing (1) and three sets of drive components (4), characterized in that: The drive assembly (4) comprises a bypass switch (401), an incoming line row (402), an outgoing line row (403), a current transformer (404), a heat sink (405) and a thyristor (406); the current transformer (404) is arranged on the outgoing line row (403) for detecting current; two connection terminals of the bypass switch (401) are electrically connected to the incoming line row (402) and the outgoing line row (403); the heat sink (405) is connected in parallel with the bypass switch (401); the thyristor (406) is connected in series in the heat sink (405); and the control box (2) is electrically connected to the bypass switch (401), the current transformer (404) and the thyristor (406).

2. According to claim 1, a three-phase AC voltage self-bypass type motor soft start intelligent control device is characterized in that: A plurality of the bypass switches (401) are arranged in parallel.

3. A three-phase AC voltage self-bypass type motor soft start intelligent control device according to claim 2, characterized in that: All the bypass switches (401) in each group of the drive components (4) are arranged in parallel, and the two wiring terminals of all the bypass switches (401) in each group are connected in parallel through two wiring blocks (407), and the two wiring blocks (407) are fixedly connected to the incoming line block (402) and the outgoing line block (403) through bolts.

4. The three-phase AC voltage self-bypass type motor soft start intelligent control device according to claim 1, characterized in that: The radiator (405) is connected in parallel with the bypass switch (401) via a connecting bar (408).

5. The three-phase AC voltage self-bypass type motor soft start intelligent control device according to claim 4, characterized in that: The heat sink (405) comprises an upper heat sink and a lower heat sink, and the thyristor (406) is connected in series between the upper heat sink and the lower heat sink.

6. The three-phase AC voltage self-bypass type motor soft start intelligent control device according to claim 1, characterized in that: The inlet lines (402) in the three groups of drive assemblies (4) are all arranged on insulating support rods (409), and the insulating support rods (409) are fixed to the housing (1) by bolts.

7. A three-phase AC voltage self-bypass type motor soft start intelligent control device according to claim 6, characterized in that: A mounting bracket (410) is also provided in the drive assembly (4), the heat sink (405) is fixedly provided on the mounting bracket (410), an insulator (411) is provided at the bottom of the mounting bracket, and the incoming line row (402) and the outgoing line row (403) are both extended to the outside of the housing (1) through an insulating sheath (412).

8. A three-phase AC voltage self-bypass type motor soft start intelligent control device according to any one of claims 1 to 7, characterized in that: The three groups of driving components (4) are arranged side by side, and an insulating plate (5) is arranged on the outside of each group of driving components (4).

9. A three-phase AC voltage self-bypass type motor soft start intelligent control device according to claim 8, characterized in that: Each group of the driving components (4) is also provided with a temperature sensor (413) and a temperature-controlled fan (414); the temperature sensor (413) and the temperature-controlled fan (414) are both electrically connected to the control box (2); and the control box (2) controls the temperature-controlled fan (414) through a signal from the temperature sensor (413).

10. A three-phase AC voltage self-bypass type motor soft start intelligent control device according to claim 9, characterized in that: A circuit control board (3) is arranged in the control box (2), and an insulating mounting board (6) is arranged at the bottom of the circuit control board (3).

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