A dual-cooling modular soft starter

Abstract

The utility model discloses a double-cooling modular soft starter. By optimizing the internal structure of the base and setting a partition tabletop to partition the conductive busbars and the radiator, on the one hand, the use safety between the current-carrying components and the main heat-dissipating components inside the soft starter is ensured. The fixing plate of the partition tabletop is used for the fixed connection of the radiator. A heat dissipation grid is specially opened on the connecting plate for the current transformer, and the existing heat dissipation fan assembly of the soft starter is used to directly and quickly discharge the internal heat. On the other hand, the working temperature of the current transformer is significantly reduced. By effectively reducing the working environment temperature of the current transformer, it can work stably within the allowable temperature range, thereby greatly improving the accuracy and stability of current sampling and significantly enhancing the operation reliability and control accuracy of the entire soft starting system.

Description

Technical Field

[0001] This utility model relates to the field of soft starter technology, specifically to a dual-heat dissipation modular soft starter. Background Technology

[0002] A soft starter is a motor control device that integrates soft starting, soft stopping, light-load energy saving, and multi-functional protection. It enables a smooth and shock-free motor start-up process and can adjust various parameters during the starting process according to the characteristics of the motor load. With the rapid development of power electronics technology, soft starters are becoming increasingly widely used.

[0003] Soft starters employ three-phase anti-parallel thyristors (or IGBTs and other power electronic devices) as voltage regulators, connected between the power supply and the motor stator, forming a structure similar to a three-phase fully controlled bridge rectifier circuit. By adjusting the input voltage and current of the motor, smooth starting and stopping processes are achieved. During operation, the high-frequency switching of the power electronic devices generates a large amount of heat, causing a rapid increase in the internal temperature of the soft starter. Current methods utilize heat sinks and cooling fans to specifically dissipate this heat. In actual use, because the copper busbar is constantly conducting, its temperature also rises significantly. The current transformers mounted on the copper busbar are easily affected by the temperature rise of both the copper busbar and the power electronic devices (the copper busbar is directly connected to the power devices). When the current transformer exceeds its normal operating temperature, the permeability of the transformer core decreases, increasing the excitation current and significantly reducing the current sampling accuracy, potentially causing malfunctions in the soft starter.

[0004] Currently, soft starters do not have a heat dissipation design for the current transformer. If a separate heat dissipation component is designed to cool the current transformer, it will not only increase the production cost of the soft starter, but also make the soft starter larger, which is not conducive to product miniaturization.

[0005] In view of this, there is an urgent need to design a soft starter that can effectively dissipate heat from the current transformer and reduce the impact of copper busbar temperature rise on the sampling accuracy of the current transformer. Summary of the Invention

[0006] To address the aforementioned problems, this utility model provides a dual-heat-dissipation modular soft starter, comprising a base, a cover connected to the top of the base, and a base plate connected to the bottom of the base. A circuit board is connected inside the cover. Power devices and a heat sink are interconnected inside the base. Conductive bars are connected to both sides of the power devices, extending to the outside of the base to form wiring portions. A current transformer is connected to one side of the conductive bar. The circuit board is electrically connected to both the current transformer and the power device. A partition platform is provided inside the base, comprising a fixed plate, a connecting plate, and a partition plate arranged sequentially. The conductive bars are positioned above the partition platform. The heat sink is fixed to the fixed plate by fasteners. A heat dissipation grid is provided on the connecting plate, facing the current transformer. A cooling fan assembly is located below the partition plate, facing the heat dissipation grid and the heat sink.

[0007] The present invention is further configured such that the fixing plate and the partition plate are parallel to each other, and the angle between the connecting plate and the fixing plate and the partition plate is a right angle or an obtuse angle.

[0008] The present invention is further configured such that the conductive bar is bent toward the heat sink side at the position opposite to the fixed plate to form a settling part, and the current transformer is sleeved on the settling part.

[0009] The present invention is further configured such that a fan chamber is formed on the base, the cooling fan assembly is connected to the fan chamber, and guide walls are provided on both sides of the fan chamber.

[0010] The present invention is further configured such that a terminal block is provided on both the inlet and outlet sides of the base, and a protective cover is connected above the terminal block. The terminal block includes terminal units arranged at intervals, and a positioning slot is provided between the terminal units. The protective cover includes a main body, and a notch is provided on the main body. The middle part of the notch extends toward one side of the base to form an elastic part. A positioning part is provided at one end of the elastic part near the base. The elastic part is connected in the positioning slot and the positioning part is engaged with the base.

[0011] The present invention is further configured such that there are gaps between the two sides of the elastic part and the main body part, the side of the positioning part near the base is a guide slope, and the side of the positioning part away from the base is a snap-fit ​​end face.

[0012] The present invention is further configured such that the two sides of the terminal block are provided with inwardly tapering clamping recesses, and the two sides of the main body extend toward the terminal block to form clamping parts, the clamping parts being connected in the clamping recesses.

[0013] The present invention is further configured such that a conductive groove is provided on the base opposite the wiring unit, the wiring end of the conductive busbar passes through the conductive groove, the wiring unit includes a wiring part and a partition part located on both sides of the wiring part, and a fastener mounting groove is provided below the wiring part.

[0014] The present invention is further configured such that the partition plate has insertion slots on both sides, and the insertion slots have insertion interfaces on the side near the cover. The cover has an L-shaped insertion part at the position opposite the insertion interface. The L-shaped insertion part passes through the insertion interface and is connected to the insertion slot. The base has a positioning seat, and the cover has a positioning hole. The cover is connected to the positioning seat by fasteners passing through the positioning hole.

[0015] The present invention is further provided with a heat dissipation hole on the side of the base away from the cooling fan assembly.

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0017] This technical solution, a dual-heat-dissipation modular soft starter, optimizes the internal structure of the base by setting up a partition platform to separate the conductors and heat sinks. Firstly, it ensures the safety of the current-carrying components and the main heat-dissipating components within the soft starter. The fixing plate on the partition platform is used for the fixed connection of the heat sink, and the connecting plate has a dedicated heat dissipation grid for the current transformer. The existing cooling fan assembly of the soft starter directly and quickly dissipates internal heat. Secondly, it significantly reduces the operating temperature of the current transformer. By effectively reducing the operating ambient temperature of the current transformer, it can operate stably within the allowable temperature range, thereby greatly improving the accuracy and stability of current sampling and significantly enhancing the operational reliability and control accuracy of the entire soft starter system.

[0018] This technical solution, a dual-heat-dissipation modular soft starter, utilizes a shared cooling fan and a dual-airflow channel design to efficiently and cost-effectively solve the heat dissipation problem of current transformers, significantly reducing their operating temperature. It reuses existing cooling fans, eliminating the need for additional heat dissipation components, effectively controlling production costs, and facilitating product miniaturization. The modular assembly of the soft starter is achieved through the partition platform structure of the base, with clear partitioning between the power device heat dissipation area and the transformer heat dissipation area, making the internal structure of the soft starter more compact and its integration higher. Attached Figure Description

[0019] Figure 1 This is a perspective view of the soft starter according to an embodiment of the present invention.

[0020] Figure 2 This is another perspective view of the soft starter according to an embodiment of the present invention.

[0021] Figure 3 This is an exploded view of the soft starter according to an embodiment of the present invention.

[0022] Figure 4 This is a perspective view of the base according to an embodiment of the present utility model.

[0023] Figure 5 This is a cross-sectional view of the soft starter of this utility model embodiment after removing the cover and circuit board.

[0024] Figure 6 This is another cross-sectional view of the soft starter according to an embodiment of the present invention after removing the cover and circuit board.

[0025] Figure 7 This is an exploded view of the base and cover of an embodiment of this utility model.

[0026] Figure 8 This is a partial perspective view of the base in an embodiment of the present utility model.

[0027] Figure 9 This is a perspective view of the protective cover according to an embodiment of the present utility model.

[0028] Figure 10 This is a cross-sectional view of the base and protective cover of an embodiment of this utility model. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Combined with appendix Figure 1 To be continued Figure 10This utility model provides a dual-heat-dissipation modular soft starter, comprising a base 1, a cover 2 connected to the top of the base 1, and a base plate 3 connected to the bottom of the base 1. A circuit board 4 is internally connected to the cover 2. Power devices 5 and a heat sink 6 are interconnected internally within the base 1. Conductive bars 7 are connected to both sides of the power devices 5, extending to the outside of the base 1 to form terminals 71. A current transformer 8 is connected to one side of the conductive bar 7. The circuit board 4 is electrically connected to both the current transformer 8 and the power device 5. The base 1 has a partition platform 11 inside. The partition platform 11 includes a fixed plate 111, a connecting plate 112 and a partition plate 113 arranged in sequence. The conductive busbar 7 is arranged above the partition platform 11. The heat sink 6 is fixed to the fixed plate 111 by fasteners. The connecting plate 112 has a heat dissipation grid 114. The heat dissipation grid 114 is arranged facing the current transformer 8. The heat dissipation fan assembly 10 is arranged below the partition plate 113. The heat dissipation fan assembly 10 is arranged facing the heat dissipation grid 114 and the heat sink 6.

[0031] In this embodiment, the base 1, the cover 2, and the bottom plate 3 are all integrally injection molded, and the partition table 11 is a partition positioning structure inside the base 1.

[0032] In this embodiment, the circuit board 4 is electrically connected to the current transformer 8 and the power device 5 respectively. The current transformer 8 transmits the current sampling signal to the processing unit on the circuit board 4. The drive circuit on the circuit board 4 outputs a control signal to drive the power device 5 to work. The power device 5 is a thyristor, and the heat sink 6 is attached to the power device 5.

[0033] In this embodiment, the cooling fan assembly 10 includes a fan body and a fan mounting plate.

[0034] In this embodiment, the conductive bus 7 includes an inlet conductive bus and an outlet conductive bus, both of which are electrically connected to the power device 5.

[0035] In this embodiment, the heat dissipation grid 114 is arranged horizontally to improve the heat dissipation effect on the current transformer 8.

[0036] In this embodiment, the dual-heat-dissipation modular soft starter optimizes the internal structure of the base 1 by setting a partition platform 11 to divide the conductor 7 and the heat sink 6 into sections. This ensures the safety of use between the current-carrying components and the main heat-dissipating components inside the soft starter. The fixing plate 111 of the partition platform 11 is used for the fixed connection of the heat sink 6. The connecting plate 112 has a heat dissipation grid 114 specially opened for the current transformer, and the internal heat is directly and quickly discharged by the existing cooling fan assembly 10 of the soft starter. Secondly, it significantly reduces the operating temperature of the transformer. By effectively reducing the operating ambient temperature of the transformer, it can operate stably within the allowable temperature range, thereby greatly improving the accuracy and stability of current sampling and greatly enhancing the operational reliability and control accuracy of the entire soft starter system.

[0037] In this embodiment, in conjunction with the appendix Figure 4 and attached Figure 5 As shown, the fixing plate 111 and the partition plate 113 are parallel to each other, the distance from the partition plate 113 to the base plate 3 is greater than the distance from the fixing plate 111 to the base plate 3, and the angle between the connecting plate 112 and the fixing plate 111 and the partition plate 113 is a right angle or an obtuse angle, thereby improving the heat dissipation performance of the cooling fan assembly 10 on the current transformer 8.

[0038] In this embodiment, in conjunction with the appendix Figure 5 As shown, the conductive busbar 7 is bent towards the heat sink side at the position opposite to the fixing plate 111 to form a settling portion 72. The current transformer 8 is sleeved on the settling portion 72. The settling portion 72 of the conductive busbar 7 allows the current transformer 8 to be more effectively aligned with the heat dissipation grid 114, making the height of the base 1 lower and facilitating the miniaturization of the soft starter. In another embodiment, as shown in the attached... Figure 4 As shown, the main body of the conductive busbar 7 can also be a straight structure.

[0039] In this embodiment, in conjunction with the appendix Figure 4 and attached Figure 8 As shown, a fan chamber 12 is provided on the base 1, and the cooling fan assembly 10 is connected in the fan chamber 12. Guide walls 13 are provided on both sides of the fan chamber 12, and the guide walls 13 can effectively optimize the internal heat dissipation channel.

[0040] In this embodiment, in conjunction with the appendix Figure 7 To be continued Figure 10As shown, the base 1 has a terminal block 14 on both the inlet and outlet sides. A protective cover 9 is connected above the terminal block 14. The terminal block 14 includes spaced-apart wiring units 141, with positioning slots 142 between the wiring units 141. The protective cover 9 includes a main body 91 with a notch 92. The middle of the notch 92 extends towards one side of the base 1 to form an elastic part 93. A positioning part 94 is provided at one end of the elastic part 93 near the base 1. The elastic part 93 is connected to the positioning slot 142, and the positioning part 94 is engaged with the base 1. To reduce the heat generated by the conductive busbar 7, a protective cover 9 is provided at the terminal 71 of the conductive busbar 7 to prevent external impurities and dust from falling on the terminal 71, which would increase the resistance of the conductive busbar 7.

[0041] In this embodiment, installing the protective cover 9 simply requires pushing it along the terminal block 14 towards the base 1, where the positioning part 94 passes through the positioning slot 142 and engages with the base 1. Removing the protective cover 9 simply requires pressing the elastic part 93 of the notch 92 and pulling it out. This protective cover 9 facilitates wiring and assembly, improving the modular assembly of the soft starter.

[0042] In this embodiment, in conjunction with the appendix Figure 9 As shown, there is a gap 95 between the two sides of the elastic part 93 and the main body part 91. The side of the positioning part 94 near the base 1 is a guide slope 941, and the side of the positioning part 94 away from the base 1 is a snap-fit ​​end face 942.

[0043] In this embodiment, in conjunction with the appendix Figure 8 and attached Figure 9 As shown, the terminal block 14 has inwardly tapering clamping recesses 143 on both sides, and the main body 91 extends towards the terminal block 14 on both sides to form clamping parts 96. The clamping parts 96 are connected in the clamping recesses 143 to improve the connection stability of the protective cover 9 on the terminal block 14.

[0044] In this embodiment, in conjunction with the appendix Figure 8 and attached Figure 10 As shown, the base 1 has a conductive groove 144 at the position opposite to the wiring unit 141. The wiring terminal 71 of the conductive busbar 7 passes through the conductive groove 144. The wiring unit 141 includes a wiring part 145 and a partition part 146 located on both sides of the wiring part 145. A fastener mounting groove 147 is provided below the wiring part 145.

[0045] In this embodiment, in conjunction with the appendix Figure 7As shown, the partition plate 113 has insertion slots 15 on both sides. The insertion slots 15 have insertion interfaces 151 on the side near the cover 2. The cover 2 has an L-shaped insertion part 21 opposite to the insertion interface 151. The L-shaped insertion part 21 passes through the insertion interface 151 and connects to the insertion slot 15. The base 1 has a positioning seat 16. The cover 2 has a positioning hole 22. The cover 2 is connected to the positioning seat 16 by fasteners passing through the positioning hole 22. After the L-shaped insertion part 21 is aligned with the insertion slot 15, the cover 2 is pushed flat so that the positioning hole 22 is aligned with the positioning seat 16. The fasteners are then connected to the positioning seat 16 by passing through the positioning hole 22, thus realizing the connection between the base 1 and the cover 2.

[0046] In this embodiment, a heat dissipation hole 17 is provided on the side of the base 1 away from the heat dissipation fan assembly 10.

[0047] This utility model of a dual-heat-dissipation modular soft starter utilizes a shared cooling fan and a dual-airflow channel design to efficiently and cost-effectively solve the heat dissipation problem of current transformers, significantly reducing their operating temperature. It reuses existing cooling fans, eliminating the need for additional heat dissipation components, effectively controlling production costs, and facilitating product miniaturization. The modular assembly of the soft starter is achieved through the partition platform structure of the base, with clear partitioning between the heat dissipation areas of the power devices and the current transformers, making the internal structure of the soft starter more compact and its integration higher.

[0048] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-heat-dissipation modular soft starter, comprising a base, a cover connected to the top of the base, and a base plate connected to the bottom of the base, wherein a circuit board is connected inside the cover, and power devices and a heat sink are connected to each other inside the base, conductive bars are connected to both sides of the power devices, the conductive bars extend to the outside of the base to form terminals, a current transformer is connected to one side of the conductive bar, and the circuit board is electrically connected to the current transformer and the power devices respectively, characterized in that... The base has a partition platform inside, which includes a fixed plate, a connecting plate and a partition plate arranged in sequence. The conductive strip is arranged above the partition platform. The heat sink is fixed to the fixed plate by fasteners. The connecting plate has a heat dissipation grid, which is positioned opposite the current transformer. A cooling fan assembly is arranged below the partition plate, which is positioned opposite the heat dissipation grid and the heat sink.

2. The dual-heat dissipation modular soft starter according to claim 1, characterized in that, The fixing plate and the partition plate are parallel to each other, and the angle between the connecting plate and the fixing plate and the partition plate is a right angle or an obtuse angle.

3. The dual-heat dissipation modular soft starter according to claim 2, characterized in that, The conductive bar is bent towards the heat sink from the position opposite the fixed plate to form a settling section, and the current transformer is sleeved on the settling section.

4. A dual-heat dissipation modular soft starter according to claim 2, characterized in that, A fan chamber is provided on the base, and the cooling fan assembly is connected to the fan chamber. Guide walls are provided on both sides of the fan chamber.

5. A dual-heat dissipation modular soft starter according to claim 1, characterized in that, The base has a wiring platform on both the inlet and outlet sides. A protective cover is connected above the wiring platform. The wiring platform includes wiring units arranged at intervals. A positioning slot is provided between the wiring units. The protective cover includes a main body with a notch. The middle part of the notch extends to one side of the base to form an elastic part. A positioning part is provided at one end of the elastic part near the base. The elastic part is connected in the positioning slot and the positioning part is engaged with the base.

6. A dual-heat dissipation modular soft starter according to claim 5, characterized in that, There are gaps between the two sides of the elastic part and the main body part. The side of the positioning part closer to the base is a guide slope, and the side of the positioning part away from the base is a snap-fit ​​end face.

7. A dual-heat dissipation modular soft starter according to claim 5, characterized in that, The wiring platform has inwardly tapering clamping recesses on both sides, and the two sides of the main body extend toward the wiring platform to form clamping parts, which are connected to the clamping recesses.

8. A dual-heat dissipation modular soft starter according to claim 5, characterized in that, The base has a conductive groove opposite the wiring unit. The terminals of the conductive busbar pass through the conductive groove. The wiring unit includes a wiring part and partitions located on both sides of the wiring part. A fastener mounting groove is provided below the wiring part.

9. A dual-heat dissipation modular soft starter according to any one of claims 1 to 8, characterized in that, The partition plate has insertion slots on both sides, and an insertion interface is opened on the side of the insertion slot near the cover. The cover has an L-shaped insertion part at the position opposite the insertion interface. The L-shaped insertion part passes through the insertion interface and is connected to the insertion slot. The base has a positioning seat, and the cover has a positioning hole. The cover is connected to the positioning seat by fasteners passing through the positioning hole.

10. A dual-heat dissipation modular soft starter according to any one of claims 1 to 8, characterized in that, The base has heat dissipation holes on the side away from the cooling fan assembly.

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