Low-voltage soft starting structure using insulating plate to replace metal fixing plate

Abstract

The utility model discloses a low-voltage soft starting structure using insulating plates to replace metal fixing plates, which comprises metal plate bottom cross beams, low-voltage soft starter valve group main bodies, bypass contactors, the insulating plates, clamping groove type fastening bolts and interval insulation paper, and a plurality of low-voltage soft starter valve group main bodies are arranged between the two metal plate bottom cross beams. Insulating plates are fixed to the two sides of the low-voltage soft starter valve group body, the insulating plates are detachably connected with the adjacent metal plate bottom cross beams through clamping groove type fastening bolts, and the insulating plates made of glass fiber reinforced plastic replace previous insulating paper and screws with insulating sheaths. The low-voltage soft starter valve group body can be directly fastened to the position of the cross beam at the bottom of the metal plate through metal bolts, the 380V voltage grade insulation requirement can be met, the glass fiber reinforced plastic profile can meet the insulation requirement and the compression strength requirement at the same time, and the installation structure and steps are greatly simplified under the condition that the structural stability is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage soft starter technology, and in particular to a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate. Background Technology

[0002] A low-voltage soft starter is an electrical device used to control the starting and running of low-voltage motors. It achieves smooth starting, reduces starting shock, and protects the motor and load by controlling the input voltage and current of the motor. The core component of a low-voltage soft starter is a silicon controlled rectifier (SCR), which is a semiconductor device that can adjust its conduction level by controlling the trigger signal to achieve voltage control.

[0003] The insulating materials (such as insulating boards and insulating paper) used in low-voltage soft starters must have high insulation resistance and good electrical insulation performance to prevent current leakage and short circuits. The insulating board structure of traditional low-voltage soft starters consists of a metal fixing plate, screws with insulating sleeves, and insulating paper. During installation, the metal fixing plate is assembled and connected to the base by screws with insulating sleeves, and the insulating paper is placed between the metal fixing plate and the base to meet the electrical clearance requirements. However, the above assembly structure is complex, the installation process is cumbersome, time-consuming, and inconvenient to disassemble and assemble. Moreover, the insulating paper and insulating sleeve are at risk of aging and cracking after long-term use, posing a great safety hazard. Therefore, this utility model discloses a low-voltage soft starter structure that uses an insulating board to replace the metal fixing plate to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate, so as to solve the technical problems mentioned in the background art, such as the complex assembly structure, cumbersome installation process, long time consumption, inconvenient disassembly and assembly of traditional low-voltage soft starters, and the risk of aging and cracking of insulating paper and insulating sheath after long-term use, which poses great safety hazards.

[0005] To achieve the above objectives, the present invention provides the following solution to the aforementioned technical problems: a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate, comprising a sheet metal bottom crossbeam, a low-voltage soft starter valve assembly body, a bypass contactor, an insulating plate, slotted fastening bolts, and spacer insulating paper. Multiple low-voltage soft starter valve assembly bodies are arranged between two sheet metal bottom crossbeams. Insulating plates are fixed to both sides of each low-voltage soft starter valve assembly body. Each insulating plate is detachably connected to the adjacent sheet metal bottom crossbeam via slotted fastening bolts. The insulating plate is made of fiberglass.

[0006] The slotted fastening bolt includes a nut, a threaded portion with a diameter smaller than that of the nut, and a smooth portion with the same diameter as the threaded portion. An annular slot is provided on the slotted fastening bolt between the threaded portion and the smooth portion. A pressure washer is threadedly connected to the outer side of the threaded portion. The sheet metal bottom crossbeam has multiple insertion holes. A narrow groove is provided on the side of each insertion hole and communicates with it. A recessed groove is provided on the outer side of each narrow groove and on the lower side of the sheet metal bottom crossbeam. The slotted fastening bolt passes through the insulating plate and mates with the insertion hole.

[0007] As a further embodiment of this utility model, the insulating plate is provided with a through hole for embedding a slotted fastening bolt, and the diameter of the through hole is the same as the diameter of the screw part.

[0008] As a further embodiment of this utility model, the cross-sectional structure of the optical rod portion is adapted to the insertion hole and the recessed groove.

[0009] As a further embodiment of this utility model, the inner diameter of the annular groove is the same as the width of the narrow groove, and the height of the annular groove is the same as the thickness of the sheet metal bottom crossbeam.

[0010] As a further embodiment of this utility model, both sides of the bottom of the sheet metal bottom crossbeam are provided with bent edges, and multiple assembly holes are provided on the sheet metal bottom crossbeam.

[0011] As a further embodiment of this utility model, a bypass contactor is installed on each of the low-voltage soft starter valve group bodies, and a spacer insulating paper is sandwiched between adjacent low-voltage soft starter valve group bodies.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model discloses a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate. The insulating plate made of fiberglass replaces the previous insulating paper and screws with insulating sleeves. The main body of the low-voltage soft starter valve group can be directly fastened to the bottom beam of the sheet metal with metal bolts. It can meet the insulation requirements of 380V voltage level, and the fiberglass profile can simultaneously meet the insulation requirements and the pressure resistance requirements. While ensuring structural stability, it greatly simplifies the installation structure and steps.

[0014] This utility model discloses a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate. The design of the slotted fastening bolts and plug-in holes simplifies and speeds up the installation of the low-voltage soft starter valve assembly. Simply align the through hole with the plug-in hole, insert the fastening bolt, push the valve assembly body to slide, allowing the annular slot to engage with the narrow groove, and then tighten the fastening bolt to complete the installation. The annular slot, narrow groove, and recessed groove design enable vertical, horizontal, and forward / backward movement limits on the low-voltage soft starter valve assembly body, ensuring stability after installation and reducing loosening or displacement caused by improper installation. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is an external view of a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate according to this utility model.

[0017] Figure 2 This is a structural exploded view of a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate according to this utility model.

[0018] Figure 3 This is a bottom view of the sheet metal bottom crossbeam in a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate, according to this utility model.

[0019] Figure 4 This utility model relates to a low-voltage soft-start structure that uses an insulating plate instead of a metal fixing plate. Figure 1 Enlarged view of the structure at point A in the image;

[0020] Figure 5 This utility model relates to a low-voltage soft-start structure that uses an insulating plate instead of a metal fixing plate. Figure 2 Enlarged view of the structure at point B in the image.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] 1. Sheet metal bottom crossbeam; 2. Low-voltage soft starter valve assembly body; 3. Bypass contactor; 4. Insulating plate; 5. Slotted fastening bolt; 6. Spacer insulating paper; 11. Plug hole; 111. Narrow slot; 112. Recessed groove; 12. Bent edge; 13. Assembly hole; 41. Through hole; 51. Nut; 52. Screw part; 53. Smooth rod part; 54. Annular slot; 55. Pressure pad. Detailed Implementation

[0023] The present invention will be further described below with reference to the embodiments.

[0024] Please see Figure 1-5This utility model provides a low-voltage soft starter structure that uses an insulating plate instead of a metal fixing plate, including a sheet metal bottom crossbeam 1, a low-voltage soft starter valve group body 2, a bypass contactor 3, an insulating plate 4, a slotted fastening bolt 5, and spacer insulating paper 6. Multiple low-voltage soft starter valve group bodies 2 are arranged between two sheet metal bottom crossbeams 1. Insulating plates 4 are fixed on both sides of the low-voltage soft starter valve group body 2. The insulating plates 4 are made of fiberglass.

[0025] Specifically, fiberglass is a composite material made by combining glass fiber and its products (such as glass cloth, tape, and felt) as reinforcing materials and synthetic resin as the matrix material through a specific process. It combines the high strength of glass fiber and the insulation properties of resin, making it a high-performance engineering material. This allows fiberglass insulation boards to provide high insulation resistance, meet the insulation requirements of 380V voltage level, ensure the safe operation of equipment, and can be directly fastened with metal bolts without the need for additional insulating sleeves or insulating paper, reducing installation steps and improving installation efficiency.

[0026] Furthermore, each of the low-voltage soft starter valve group bodies 2 is equipped with a bypass contactor 3, and a spacer insulating paper 6 is sandwiched between adjacent low-voltage soft starter valve group bodies 2.

[0027] Specifically, in the low-voltage soft starter, the bypass contactor 3 ensures that the motor starts smoothly through the soft starter during the startup phase. After startup, the bypass contactor 3 switches the motor to normal operation, thereby improving the system's operating efficiency and reliability. The spacer insulating paper 6 is an insulating material used in electrical equipment to isolate different electrical components and prevent electrical short circuits and leakage. It can prevent electrical short circuits or leakage between adjacent low-voltage soft starter valve group bodies 2.

[0028] Furthermore, both sides of the bottom of the sheet metal bottom crossbeam 1 are provided with bent edges 12, and the sheet metal bottom crossbeam 1 is provided with multiple assembly holes 13.

[0029] Specifically, the bent edge 12 can increase the rigidity and strength of the sheet metal bottom crossbeam 1, preventing deformation due to stress during use. The mounting hole 13 is used to fix the sheet metal bottom crossbeam 1 to other structures, such as cabinets, bases or other support frames. Bolts or other fasteners are passed through the mounting hole 13 to firmly install the crossbeam in place, ensuring the stability of the entire low-voltage soft starter.

[0030] Furthermore, the insulating plates 4 are all detachably connected to the adjacent sheet metal bottom crossbeams 1 by slotted fastening bolts 5. The slotted fastening bolts 5 include a nut 51, a screw portion 52 with a diameter smaller than that of the nut 51, and a smooth portion 53 with a diameter consistent with that of the screw portion 52. An annular groove 54 is provided on the slotted fastening bolt 5 and between the screw portion 52 and the smooth portion 53. A pressure washer 55 is threaded to the outer side of the screw portion 52. The sheet metal bottom crossbeam 1 has multiple insertion holes 11. A narrow groove 111 communicating with each insertion hole 11 is provided on the side of each insertion hole 11. A recessed groove 112 is provided around the narrow groove 111 and on the lower side of the sheet metal bottom crossbeam 1. The slotted fastening bolts 5 pass through the insulating plates 4 and engage with the insertion holes 11.

[0031] Specifically, first, place the low-voltage soft starter valve assembly body 2 between the sheet metal bottom crossbeams 1, aligning the through hole 41 on the insulating plate 4 with the insertion hole 11 on the sheet metal bottom crossbeam 1. Then, insert the smooth rod 53 of the slot-type fastening bolt 5 into the through hole 41 and the insertion hole 11. Next, push the low-voltage soft starter valve assembly body 2 to slide along the sheet metal bottom crossbeam 1, causing the annular groove 54 to embed into the narrow groove 111. At this time, the inner edge of the annular groove 54 matches the width of the narrow groove 111, enabling vertical and horizontal positioning. Finally, press the clamping pad 55 and use a tool to tighten the screw 52 of the slot-type fastening bolt 5. As the screw part 52 is screwed, the height of the slotted fastening bolt 5 gradually rises, and the bottom wall of the annular slot 54 is embedded in the recessed groove 112 to achieve front and rear limit, thereby completing the installation of the low-pressure soft starter valve group body 2. The installation can be completed simply by aligning the holes, inserting the bolt, sliding the body and screwing the bolt, which greatly reduces the installation time and labor intensity and further simplifies the assembly process.

[0032] Furthermore, the insulating plate 4 is provided with a through hole 41 for embedding a slot-type fastening bolt 5, and the diameter of the through hole 41 is the same as the diameter of the screw part 52;

[0033] Specifically, ensure that the slotted fastening bolts 5 can pass smoothly through the insulation plate 4 and fit tightly during installation without loosening or shaking.

[0034] Furthermore, the cross-sectional structure of the optical rod portion 53 is adapted to the insertion hole 11 and the recessed groove 112;

[0035] Specifically, the diameter of the smooth rod 53 is consistent with the diameter of the insertion hole 11, ensuring that the slotted fastening bolt 5 can be smoothly inserted into the insertion hole 11, and that there will be no loosening or shaking during the installation process. After the slotted fastening bolt 5 is adapted to the narrow groove 111, the clamping pad 55 is pressed down, and the slotted fastening bolt 5 is tightened with a tool. As the height of the slotted fastening bolt 5 gradually increases, the annular groove 54 can be accurately embedded in the recessed groove 112, which can limit the low-pressure soft starter valve group body 2.

[0036] Furthermore, the inner diameter of the annular groove 54 is the same as the width of the narrow groove 111, and the height of the annular groove 54 is the same as the thickness of the sheet metal bottom crossbeam 1.

[0037] Specifically, after the through hole 41 is aligned with the insertion hole 11, the slotted fastening bolt 5 is inserted into the insertion hole 11 through the through hole 41, and then the low-pressure soft starter valve group body 2 is pushed to slide along the bottom crossbeam 1 of the sheet metal, so that the annular slot 54 is inserted into the narrow slot 111, which can limit the low-pressure soft starter valve group body 2 in the upper and lower and left and right directions, so as to achieve a tight fit and limit function.

[0038] Working principle: In use, first place the low-voltage soft starter valve group body 2 side by side between the two sheet metal bottom crossbeams 1, so that the insulating plate 4 is in contact with the sheet metal bottom crossbeam 1. After the through hole 41 is aligned with the plug hole 11, insert the slot-type fastening bolt 5 through the through hole 41 into the plug hole 11. Then push the low-voltage soft starter valve group body 2 to slide along the sheet metal bottom crossbeam 1, so that the annular slot 54 is inserted into the narrow groove 111, which can limit the low-voltage soft starter valve group body 2 up and down and left and right. After that, press the clamping pad 55 and use a tool to tighten the slot-type fastening bolt 5. As the height of the slot-type fastening bolt 5 gradually rises, the bottom wall of the annular slot 54 is inserted into the recessed groove 112, which can limit the low-voltage soft starter valve group body 2 back and forth, ensuring the stable installation of the low-voltage soft starter valve group body 2.

Claims

1. A low-voltage soft-start structure that uses an insulating plate instead of a metal fixing plate, characterized in that, The device includes a sheet metal bottom crossbeam (1), a low-voltage soft starter valve group body (2), a bypass contactor (3), an insulating plate (4), a slotted fastening bolt (5), and spacer insulating paper (6). Multiple low-voltage soft starter valve group bodies (2) are arranged between the two sheet metal bottom crossbeams (1). Insulating plates (4) are fixed on both sides of the low-voltage soft starter valve group body (2). The insulating plates (4) are detachably connected to the adjacent sheet metal bottom crossbeams (1) by slotted fastening bolts (5). The insulating plates (4) are made of fiberglass. The slotted fastening bolt (5) includes a nut (51), a screw part (52) with a diameter smaller than that of the nut (51), and a smooth part (53) with a diameter consistent with that of the screw part (52). An annular slot (54) is provided on the slotted fastening bolt (5) and between the screw part (52) and the smooth part (53). A pressure washer (55) is threaded on the outer side of the screw part (52). The sheet metal bottom crossbeam (1) is provided with multiple insertion holes (11). A narrow groove (111) is provided on the side of each insertion hole (11) and communicates with it. A recessed groove (112) is provided on the periphery of the narrow groove (111) and on the lower side of the sheet metal bottom crossbeam (1). The slotted fastening bolt (5) passes through the insulating plate (4) and engages with the insertion hole (11).

2. The low-voltage soft starter structure according to claim 1, which uses an insulating plate instead of a metal fixing plate, is characterized in that: The insulating plate (4) has a through hole (41) for embedding a slotted fastening bolt (5), and the diameter of the through hole (41) is the same as the diameter of the screw part (52).

3. A low-voltage soft starter structure using an insulating plate instead of a metal fixing plate according to claim 1, characterized in that: The cross-sectional structure of the light rod portion (53) is adapted to the insertion hole (11) and the recessed groove (112).

4. A low-voltage soft starter structure using an insulating plate instead of a metal fixing plate according to claim 1, characterized in that: The inner diameter of the annular groove (54) is the same as the width of the narrow groove (111), and the height of the annular groove (54) is the same as the thickness of the sheet metal bottom crossbeam (1).

5. A low-voltage soft starter structure using an insulating plate instead of a metal fixing plate according to claim 1, characterized in that: The bottom sides of the sheet metal bottom beam (1) are provided with bent edges (12), and the sheet metal bottom beam (1) is provided with multiple assembly holes (13).

6. A low-voltage soft starter structure using an insulating plate instead of a metal fixing plate according to claim 1, characterized in that: Each of the low-voltage soft starter valve group bodies (2) is equipped with a bypass contactor (3), and an insulating paper (6) is sandwiched between adjacent low-voltage soft starter valve group bodies (2).

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