Electromagnetic system of contactor

Abstract

The utility model relates to an electromagnetic system of a contactor, which comprises a shell, and a moving contact assembly, a static iron core, a coil framework, a travel switch and an electronic control unit are arranged in the shell. According to the utility model, the moving contact assembly, the static iron core, the coil framework, the travel switch and other parts are integrated in the shell, the compactness of the whole structure is realized, and the design of the coil framework enables one end of the coil framework to extend into the static iron core to be matched with the structure of the static iron core and the other end of the coil framework to extend outwards to install the travel switch, so that the space is saved; the arrangement of all the components is more reasonable, the space utilization rate is improved, the air gap groove formed in the static iron core is used for containing the working air gap, the size and position of the working air gap can be controlled, it is ensured that the electromagnetic system can generate stable and predictable magnetic field force during working, then the moving contact assembly is driven to act accurately, and the service life of the electromagnetic system is prolonged. And the electromagnetic system realizes a remarkable energy-saving effect by optimizing the processes of magnetic field generation and action execution.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to the electromagnetic system of contactors. Background Art

[0002] Contactors, as indispensable key components in the power automation system, the performance of their electromagnetic systems is directly related to the stability and efficiency of the entire electrical control loop. However, the electromagnetic systems of contactors on the market generally face the problem of excessive control power, which not only exacerbates system energy consumption but also may cause unnecessary energy waste and rising operating costs. Specifically, when the contactor performs the closing and holding operations, the electromagnet consumes a large amount of electrical energy, especially in high-voltage and high-current application environments, and the energy consumption problem is particularly prominent. In addition, the type of control power supply also has a profound impact on the performance and energy consumption of the electromagnetic system. Although AC power supplies are widely used, the non-constant characteristics of their voltage and current waveforms easily lead to energy consumption fluctuations during the operation of the electromagnet. Although DC power supplies have better stability, they may be limited by the flexibility of power supply and cost considerations in specific application scenarios. Moreover, most of the iron cores used in the current electromagnetic systems of contactors are of the traditional E-shaped structure, and this design to a certain extent limits the improvement space of the electromagnetic conversion efficiency. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide an electromagnetic system of a contactor with a compact structure, high space utilization rate and low power consumption.

[0004] To achieve the above purpose, the utility model adopts such an electromagnetic system of a contactor, which includes a housing. A moving contact assembly, a static iron core, a travel switch and an electronic control unit are arranged in the housing. The moving contact assembly includes a contact bridge assembly and a moving iron core arranged at one end of the contact bridge assembly. The moving iron core is arranged opposite to the static iron core, and a working air gap is formed therebetween. An air gap groove for placing the working air gap is opened on the static iron core, and the working air gap is located in the air gap groove. A coil bobbin is arranged on the upper surface of the static iron core, and at least one exciting wire coil is wound on the coil bobbin for generating a magnetic field to drive the moving contact assembly to actuate when powered on. One end of the coil bobbin extends into the static iron core to cooperate with the structure of the static iron core, and the opposite end extends outwards to install the travel switch.

[0005] Compared with the prior art, the beneficial effects of the above structure are as follows: By integrating components such as the moving contact assembly, static iron core, coil skeleton, and travel switch within the housing, the compactness of the overall structure is achieved. With the design of the coil skeleton, one end extends into the static iron core to match its structure, and the other end extends outward to install the travel switch, which not only saves space but also makes the layout of each component more reasonable, improving the space utilization rate. The air gap groove opened on the static iron core is used to place the working air gap, enabling it to control the size and position of the working air gap, thereby ensuring that the electromagnetic system can generate a stable and predictable magnetic force during operation, and further driving the accurate movement of the moving contact assembly. Moreover, through optimizing the processes of magnetic field generation and action execution, this electromagnetic system achieves a remarkable energy-saving effect.

[0006] The present utility model is further configured such that the exciting coil package includes an attracting winding and a holding winding. The attracting winding is used for the initial attracting stage of the moving iron core, and the holding winding is used for the holding stage of the moving iron core. By dividing the exciting coil package into an attracting winding and a holding winding, the required magnetic field intensity can be provided respectively according to different working stages of the moving iron core. In the initial attracting stage, the attracting winding provides a larger current to generate sufficient magnetic force to ensure that the moving iron core can be quickly and reliably attracted to the static iron core. After the moving iron core reaches a stable position and enters the holding stage, at this time, the holding winding provides a smaller current to maintain the magnetic field to hold the position of the moving iron core. This method of power supply in stages avoids using high current throughout the entire working process, thereby significantly reducing energy consumption and improving energy efficiency.

[0007] The present utility model is further configured such that the exciting coil package is a single-coil winding, and the single-coil winding is used to simultaneously achieve the initial attraction and holding stages of the moving iron core. The electronic control unit controls the state of the moving iron core by adjusting the output power. By using a single-coil winding as the exciting coil package, the structure of the electromagnetic system is greatly simplified. The electronic control unit can, by controlling the output power of the single-coil winding, minimize unnecessary energy consumption while ensuring the reliable movement of the moving iron core. In the initial attracting stage, sufficient current is provided to generate a strong magnetic force, and in the holding stage, the current is reduced to maintain a stable magnetic field.

[0008] The present utility model is further configured such that both the moving iron core and the static iron core are of a U-shaped structure, and the height of the moving iron core is less than that of the static iron core. The U-shaped structure enables the iron core to more effectively concentrate magnetic lines of force under the action of the magnetic field, reducing the leakage and diffusion of the magnetic field, which helps to generate a stronger magnetic force during the attracting process, thereby ensuring that the moving iron core can be quickly and reliably attracted to the static iron core. At the same time, since the height of the moving iron core is less than that of the static iron core, when the two are attracted, the contact area between them is larger, further enhancing the concentration and stability of the magnetic field.

[0009] The present utility model is further configured such that a reaction spring is provided between the coil bobbin and the contact bridge assembly. One end of the reaction spring abuts against the contact bridge assembly, and the other end abuts against the coil bobbin. Through the setting of the reaction spring, when the contact bridge assembly is affected by the magnetic force of the coil, it can obtain additional force support, thereby ensuring that the contacts can be more closely closed when closed.

[0010] The present utility model is further configured such that a moving iron core pad is provided between the moving iron core and the contact bridge assembly. The moving iron core pad is installed on the contact bridge assembly. A moving iron core plate is provided at one end of the moving iron core away from the moving iron core pad. Both sides of the moving iron core plate bend outward and extend to be connected to the contact bridge assembly. Through the setting of the moving iron core pad, it provides a stable support surface, making the contact between the moving iron core and the contact bridge assembly more stable and reliable, helping to reduce the problem of poor contact caused by vibration or impact. The two sides of the moving iron core plate bend outward and extend to be connected to the contact bridge assembly, which can effectively transmit the electromagnetic force received by the moving iron core evenly to the contact bridge assembly.

[0011] The present utility model is further configured such that grooves are provided on both sides of the static iron core. A core pressing plate is provided in the grooves. A static iron core pad is provided between the static iron core and the housing. The static iron core pad is installed on the housing. By providing a cooperating core pressing plate in the grooves on both sides of the static iron core, the fixing effect of the static iron core inside the housing can be effectively enhanced, and the presence of the core pressing plate can prevent the static iron core from shifting or loosening when subjected to electromagnetic force or external vibration, thereby ensuring the stability and reliability of the entire structure.

[0012] The present utility model is further configured such that a travel switch is provided at one end with a travel bracket. The travel switch is installed on the housing through the travel bracket provided at one end, and the installation position corresponds to the end of the coil bobbin extending outward. The travel switch is installed on the housing through the travel bracket, and this installation position corresponds to the end of the coil bobbin extending outward, ensuring that when the coil bobbin moves to a predetermined position, the travel switch can be accurately triggered.

[0013] The present utility model is further configured such that the electronic control unit supplies power to an external power source and includes control logic to support AC and DC inputs for controlling the operation of the entire electromagnetic system. Through the electronic control unit, it can accept two different types of power inputs, AC and DC, enabling it to work properly in various power environments, greatly expanding the application range and flexibility of the electromagnetic system. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the housing structure of an embodiment of the present utility model.

[0015] Figure 2 It is an exploded view of the electromagnetic system inside the housing of an embodiment of the present utility model.

[0016] Figure 3 It is an exploded front view of the moving contact assembly and the static iron core of the embodiment of the present utility model.

[0017] Figure 4 It is an exploded front view of the static iron core and the coil skeleton of the embodiment of the present utility model.

[0018] Figure 5 It is an exploded view of the cooperation between the contact bridge assembly and the coil skeleton of the embodiment of the present utility model.

[0019] Figure 6 It is a front view of the moving contact assembly of the embodiment of the present utility model.

[0020] Figure 7 It is a structural schematic diagram of the moving contact assembly and the static iron core of the embodiment of the present utility model.

[0021] Figure 8 It is a sectional view of the cooperation between the static iron core and the housing of the embodiment of the present utility model. Detailed implementation manners

[0022] As Figure 1-8 shown, the first specific embodiment of the present utility model provides an electromagnetic system of a contactor, including a housing 1. Inside the housing 1, there are arranged a moving contact assembly 2, a static iron core 3, a travel switch 4, and an electronic control unit. The moving contact assembly 2 is composed of a contact bridge assembly 21 and a moving iron core 22 arranged at the lower end of the contact bridge assembly 21. The moving iron core 22 is arranged opposite to the static iron core 3, and a working air gap is formed therebetween. An air gap groove 31 for placing the working air gap is provided on the static iron core 3, and the working air gap is located in the air gap groove 31, which is used to precisely control and maintain the size of this working air gap during the manufacturing and assembly processes.

[0023] On the upper surface of the static iron core 3, there are two independent coil skeletons 32. The two coil skeletons 32 are symmetrically located on the left and right sides of the static iron core 3 respectively. An attracting winding and a holding winding (not shown in the figure) are wound on each coil skeleton 32. The attracting winding provides a strong magnetic force during the initial attraction stage of the moving iron core 22 to ensure that the moving iron core 22 can be attracted in place quickly and reliably. The holding winding is responsible for maintaining the position of the moving iron core 22 with a smaller current after the moving iron core 22 reaches a stable position, thereby achieving energy saving and reducing heat generation. In order to match the structure of the static iron core 3 and ensure a stable installation, one end of each of the two coil skeletons 32 extends appropriately into the static iron core 3. In addition, the opposite ends of the two coil skeletons 32 also extend outward, but a travel switch 4 is only installed on the extended part of the left coil skeleton 32. The travel switch 4 is firmly installed on the housing 1 through a travel bracket 41 provided at one end thereof. Its installation position corresponds to the extended part of the left coil skeleton 32, and a reaction spring 10 connected to the contact bridge assembly 21 is provided on both sides of each coil skeleton 32. One end of the reaction spring 10 abuts against the slot hole 211 of the contact bridge assembly 21, and the other end abuts against the installation groove 321 of the coil skeleton 32.

[0024] Both the moving iron core 22 and the static iron core 3 adopt a U-shaped structure, and the height of the moving iron core 22 is less than that of the static iron core 3. A moving iron core pad 23 is provided between the moving iron core 22 and the contact bridge assembly 21. The moving iron core pad 23 is installed on the contact bridge assembly 21. A moving iron core plate 24 is provided at one end of the moving iron core 22 away from the moving iron core pad 23. The two sides of the moving iron core plate 24 bend and extend outward and are connected to the contact bridge assembly 21.

[0025] Grooves 33 are opened on both sides of the static iron core 3. A core pressing plate 34 is provided in the grooves 33 to enhance the structural strength of the static iron core 3. At the same time, a static iron core pad 35 is also provided between the static iron core 3 and the housing 1. The static iron core pad 35 is installed on the housing 1.

[0026] The electronic control unit, as the core of the entire electromagnetic system, is powered by an external power supply and incorporates advanced control logic to support AC and DC inputs.

[0027] The above is the solution of the specific embodiment 1 of the present invention. In addition, excluding the solution of the above embodiment 1, the present invention also includes a specific embodiment as follows:

[0028] The specific embodiment 2 of the present invention provides an electromagnetic system of a contactor. The electromagnetic system is similar in structure to embodiment 1 and also includes key components such as a housing 1, a moving contact assembly 2, a static iron core 3, a coil skeleton 32, and a travel switch 4 provided in the housing 1. However, in terms of the technical solution, embodiment 2 adopts a simplified structure.

[0029] Specifically, only a single coil winding (not shown) is wound around each coil bobbin 32. In the initial suction phase, the electronic control unit supplies a large current to the single winding to quickly generate a strong magnetic force, ensuring that the moving iron core 22 can be quickly and reliably sucked in place. When the moving iron core 22 reaches the stable position, the electronic control unit then reduces the current output and maintains the position of the moving iron core 22 with a smaller current, thereby achieving the effects of energy saving and reduced heat generation.

[0030] Except for the different design of the coil winding, the moving iron core 22 and the static iron core 3 in the second embodiment both adopt the same U-shaped structure design as in the first embodiment, and the height of the moving iron core 22 is less than the height of the static iron core 3, ensuring the compactness and stability of the structure. A moving iron core pad 23 is provided between the moving iron core 22 and the contact bridge assembly 21. The moving iron core pad 23 is installed on the contact bridge assembly 21. The moving iron core 22 is provided with a moving iron core plate 24 at one end away from the moving iron core pad 23. The two sides of the moving iron core plate 24 bend outward and extend and are connected to the contact bridge assembly 21.

[0031] Grooves 33 are opened on both sides of the static iron core 3. A core pressing plate 34 is provided in the grooves 33 to enhance the structural strength of the static iron core 3. At the same time, a static iron core pad 35 is also provided between the static iron core 3 and the housing 1. The static iron core pad 35 is installed on the housing 1.

[0032] And it also supports external power supply and AC / DC input, but the control logic focuses on the intelligent adjustment of the single winding to ensure that the system can maintain the best performance in different working stages.

[0033] Of course, in addition to the above embodiments, the present utility model can also have many other embodiments. Without departing from the essence of the technical solution of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. And if these changes or deformations are equivalent to the technical solutions in this patent, then these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. An electromagnetic system of a contactor, comprising a housing, characterized in that: A moving contact assembly, a stationary iron core, a travel switch and an electronic control unit are arranged in the shell. The moving contact assembly includes a contact bridge assembly and a moving iron core arranged at one end of the contact bridge assembly. The moving iron core and the stationary iron core are arranged opposite to each other, and a working air gap is formed therebetween. An air gap groove for placing the working air gap is opened on the stationary iron core, and the working air gap is located in the air gap groove. A coil frame is provided on the upper surface of the stationary iron core, and at least one excitation coil is wound on the coil frame for generating a magnetic field when power is turned on to drive the moving contact assembly to operate. One end of the coil frame extends into the stationary iron core to match the structure of the stationary iron core, and the other end extends outward to install the travel switch.

2. The electromagnetic system of the contactor according to claim 1, characterized in that: The excitation coil comprises an attraction winding and a holding winding, wherein the attraction winding is used in the initial attraction stage of the moving iron core, and the holding winding is used in the holding stage of the moving iron core.

3. The electromagnetic system of the contactor according to claim 1, characterized in that: The excitation coil is a single coil winding, and the single coil winding is used to simultaneously realize the initial attraction and holding stages of the moving iron core. The electronic control unit controls the state of the moving iron core by adjusting the output power.

4. The electromagnetic system of the contactor according to claim 1, 2 or 3, characterized in that: The moving iron core and the static iron core are both U-shaped structures, and the height of the moving iron core is smaller than that of the static iron core.

5. The electromagnetic system of the contactor according to claim 4, characterized in that: A reaction spring connected between the coil frame and the contact bridge assembly is provided, one end of the reaction spring abuts against the contact bridge assembly, and the other end abuts against the coil frame.

6. The electromagnetic system of the contactor according to claim 4, characterized in that: A moving iron core pad is provided between the moving iron core and the contact bridge assembly. The moving iron core pad is installed on the contact bridge assembly. A moving iron core plate is provided at one end of the moving iron core away from the moving iron core pad. Both sides of the moving iron core plate bend outward and extend and are connected to the contact bridge assembly.

7. The electromagnetic system of the contactor according to claim 4, characterized in that: Grooves are provided on both sides of the static iron core, and iron core pressure plates are provided in the grooves. A static iron core pad is provided between the static iron core and the shell, and the static iron core pad is installed on the shell.

8. The electromagnetic system of the contactor according to claim 4, characterized in that: A travel bracket is provided at one end of the travel switch. The travel switch is installed on the housing through the travel bracket arranged at one end, and the installation position corresponds to one end of the coil frame extending outward.

9. The electromagnetic system of the contactor according to claim 4, characterized in that: The electronic control unit is powered by an external power supply and includes control logic to support AC and DC inputs for controlling the operation of the entire electromagnetic system.

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