How to customize a suitable distribution box enclosure?

 

Contents:
1. A Key Indicator for Distribution Box Housing
2. Crucial forCustomizing Distribution Box Enclosures
3. Size and structure
4. Customization process

5.When designing the enclosure size of a distribution box, how can we consider possible future upgrades and expansions of electrical components to avoid frequent replacement of the enclosure?

 

1.A Key Indicator for Distribution Box Housing 

 

The protection level is an important indicator to measure the ability of the distribution box housing to protect against foreign objects and water intrusion, and is usually expressed by an IP code. For example, IP54 means that the dustproof level is level 5 and the waterproof level is level 4, which is suitable for general indoor environments; while IP67 means that the dustproof level is level 6 (completely dustproof) and the waterproof level is level 7 (completely waterproof under certain pressure and time), which is more suitable for use in harsh outdoor environments or places with special waterproof requirements. Different application scenarios have different requirements for protection levels. For example, in chemical companies, seaside environments, etc., due to the presence of corrosive gases or high humidity, strong winds and other factors, a distribution box housing with a higher protection level is required to prevent electrical components from being corroded and damaged, and ensure the reliability of the power system.

 

2. Crucial for Customizing Distribution Box Enclosures

 

Material selection is a key link in customizing the enclosure of a distribution box. At present, the common enclosure materials of distribution boxes on the market are divided into two categories: metal and non-metal. Metal materials such as stainless steel and cold-rolled steel plates have the advantages of high strength and good heat dissipation performance, and are suitable for occasions with high requirements for mechanical strength and heat dissipation, such as distribution boxes in large industrial plants. Among them, stainless steel also has good corrosion resistance and can remain stable in harsh chemical environments. However, metal enclosures also have some disadvantages, such as easy conductivity, the need to take grounding measures to ensure safety, and rust may occur in certain environments. Non-metallic materials such as engineering plastics and fiberglass have the characteristics of light weight, good insulation performance, and corrosion resistance. They are widely used in places with high insulation performance requirements and complex environments, such as civil buildings and electronic equipment rooms. Engineering plastic enclosures have various shapes, are easy to process, and have relatively low costs; fiberglass enclosures have higher strength and weather resistance, and can be used outdoors for a long time without performance degradation.

 

3. Tailoring for Distribution Box Functionality

 

The size should be accurately determined according to the layout and number of internal electrical components to ensure that the components can be reasonably installed, and sufficient space should be reserved for future maintenance and repair. For example, some large distribution boxes may need to install multiple circuit breakers, contactors and other equipment, which requires a larger internal space, and the location of each component should be reasonably planned to ensure neat wiring and convenient operation. In terms of structural design, the opening method of the shell, the safety of the door lock, the layout of the ventilation and heat dissipation holes, etc. should be considered. Common opening methods include side doors and front doors. Side doors are suitable for places with limited space and are convenient for operation and maintenance from the side; front doors are more convenient for front observation and operation of internal components. The door lock should have good anti-theft performance to prevent non-professionals from opening the distribution box at will and causing safety accidents. The location and size of the ventilation and heat dissipation holes should be designed according to the heat generated by the electrical components to ensure effective heat dissipation and avoid damage to the components due to excessive temperature.

 

4. Customization process:

 

In the process of customizing the distribution box shell, rigorous and standardized process flow is the core of ensuring product quality. Specifically, the process flow of customized distribution box shell is as follows:

 

4.1 Design drawing: According to customer needs and the protection level, material, size and structural design elements determined in the early stage, use professional drawing software to draw detailed distribution box shell drawings, clarify the size, shape and assembly relationship of each component, and provide precise guidance for subsequent processing and production.

4.2 Raw material preparation: According to the materials selected by the design, purchase metal plates or non-metallic materials that meet the quality standards. For metal materials, such as stainless steel plates, cold-rolled steel plates, etc., ensure that their thickness, hardness and other performance indicators meet the requirements; for non-metallic materials, such as engineering plastic particles, fiberglass fibers, etc., strictly control the quality. At the same time, sample and inspect the purchased raw materials to check whether their chemical composition, mechanical properties, etc. meet the standards.

4.3 Processing and molding: If it is a metal material, CNC stamping, bending, welding and other processes are mainly used. CNC stamping can accurately punch out holes and contours of various shapes; the bending process bends the sheet into a specific angle and shape according to the design requirements; welding is used to connect the various components into a complete shell frame. During the welding process, the welding parameters must be controlled to ensure that the weld is firm and flat, without problems such as false welding and leaking welding. For non-metallic materials, injection molding, compression molding and other processes are commonly used. Injection molding is suitable for engineering plastic shells.

The melted plastic is injected into the mold cavity and formed into the desired shape after cooling; compression molding is mostly used for FRP shell production. The pre-prepared FRP fiber and resin mixture is placed in the mold and solidified under a certain pressure and temperature.

 

4.4 Surface treatment: In order to improve the protection performance and aesthetics of the distribution box shell, surface treatment is required. For metal shells, common surface treatment processes include spraying and electroplating. Spraying is to adsorb plastic powder on the metal surface through electrostatic adsorption, and then solidify it through high-temperature baking to form a uniform, corrosion-resistant coating; electroplating is to plate a layer of metal on the metal surface through electrochemical methods, such as zinc plating, chrome plating, etc., to improve the corrosion resistance and decorativeness of the metal. For non-metallic shells, surface treatment methods such as spray painting and printing can be used to make their appearance more beautiful, and at the same time, they can also play a certain protective role.

4.5 Assemble accessories: After completing the production and surface treatment of the shell body, start to assemble various accessories, such as door locks, hinges, ventilation and heat dissipation devices, nameplates, etc. The door locks should be installed firmly, open and close smoothly, and have good anti-theft performance; the hinges should ensure that the door opens and closes flexibly and can withstand a certain weight; the ventilation and heat dissipation devices should be installed in the appropriate position according to the design requirements to ensure good ventilation; the nameplate should clearly mark the relevant information of the distribution box, such as model, specification, manufacturer, production date, etc.

4.6 Quality inspection: This is a crucial link in the entire process, and quality control runs through it. On the basis of raw material inspection, the semi-finished products after processing and forming are tested for dimensional accuracy to ensure that the dimensions of each component meet the design requirements; the shell after surface treatment is tested for coating thickness, adhesion, etc. to ensure the quality of surface treatment; after assembly, the overall protection level test is carried out to simulate the actual use environment and test the shell's ability to protect against foreign objects and water; electrical performance tests are also carried out to ensure that the insulation performance and grounding performance of the shell meet safety standards. Only products that pass all quality inspections can enter the next link.

4.7 Packaging and warehousing: The distribution box shell that has passed the quality inspection is packaged with appropriate packaging materials, such as cartons, foam boards, etc., to prevent damage during transportation and storage. After packaging, it is classified and stored according to batch, model and other information, waiting to be shipped to customers.

 

5.When designing the enclosure size of a distribution box, how can we consider possible future upgrades and expansions of electrical components to avoid frequent replacement of the enclosure?

 

5.1Research and prediction
During the design process, we will closely follow the technological development trends of the electrical industry and understand the development trends of various electrical components. For example, with the advancement of power electronics technology, power modules may develop in the direction of higher power density and smaller size, but at the same time may require more heat dissipation space or special installation structures. By studying these trends, a certain margin can be reserved in the early stage of design.

 

Customer demand communication: Have in-depth exchanges with customers who use distribution boxes to understand their possible future business expansion directions, plans to increase electrical equipment, etc. For example, for some manufacturing companies, they may plan to increase production lines in the next few years, which means that more circuit loops and larger capacity electrical components are required. After understanding these potential needs, the space can be appropriately increased when designing the shell size.

 

5.2Space reservation
Internal layout planning: When designing the internal layout of the distribution box, do not fill the space, but reserve a certain proportion of blank area. For example, 20% - 30% of the space can be reserved on one side or the bottom of the distribution box for electrical components that may be added in the future. At the same time, the wiring design should also take into account the convenience of routing in these reserved spaces, and reserve sufficient wire troughs or wiring channels.

 

Height and width margin: When determining the height and width of the housing, take into account the larger size components that may be used in the future. For the height direction, the installation height of 1-2 standard electrical components can be increased, such as 10-20 cm, to cope with the possible taller or components with special heat dissipation devices. In the width direction, reserve 10%-20% width margin to facilitate the installation of wider modules or increase additional wiring space.

 

5.3 Modular design
Functional partition modularization: Divide the interior of the distribution box into different functional module areas, such as power module area, control module area, metering module area, etc. Each module area adopts a standardized size and interface design. When a module needs to be upgraded or expanded, it can be easily replaced or added with a new module without affecting the normal operation of other modules. For example, the power module area can be designed as a drawer structure. When the power supply component needs to be upgraded, the old power module drawer can be directly pulled out and replaced with a new one.

 

Scalable module interface: Design a unified and scalable electrical interface and installation structure. For example, a universal rail installation method is adopted, so that electrical components of different manufacturers and different specifications but meeting the standard rail installation dimensions can be easily installed. At the same time, in terms of electrical connection, a sufficient number of spare terminals and busbar capacity are reserved to meet the electrical connection needs after future component additions or upgrades.

 

5.4 Flexibility design
Removable and adjustable structure: The outer shell of the distribution box adopts a detachable structural design, such as side panels, back panels and other parts can be easily disassembled and installed. In this way, when the internal space needs to be expanded, the space can be increased by removing some side panels. In addition, the internal mounting brackets and partitions are also designed to be adjustable, which can be flexibly adjusted according to the size and layout of the actual installed components.

 

Highly adaptable heat dissipation system: Design a highly adaptable heat dissipation system that can meet the heat dissipation needs of different heat-generating power components. For example, a fan or heat sink combination with adjustable air volume is used. When the heat of the upgraded components increases in the future, the heat dissipation efficiency can be improved by adjusting the fan speed or increasing the number of heat sinks without large-scale transformation of the entire heat dissipation system.