A high current DC contactor for frequency converter series

Abstract

The present invention provides a high-current DC contactor for a frequency converter series, comprising a coil assembly; an iron core is inserted into the coil assembly, a core rod is fixed through the top of the iron core, and a movable contact assembly is mounted on the upper portion of the core rod; the coil assembly is fixed in an outer housing, a static contact assembly is mounted on the outer housing to match the movable contact assembly, and the static contact assembly has terminal leads outside the outer housing; a cap is mounted on the outer housing, and the outer housing and the cap are relatively movable, and the inner cavity formed by the outer housing and the cap is sealed and insulated. The present invention completely encloses the electromagnetic system and contact system within the insulating outer housing, effectively improving insulation and dustproof performance requirements, and can operate normally even in high-temperature and dusty environments, and can be widely used in frequency converters. Positions for magnetic arc extinguishing are reserved on the sides of the contacts, which can effectively further improve load capacity.

Description

Technical Field

[0001] The invention relates to a high-current DC contactor used in a frequency converter series. Background Art

[0002] Frequency converters (VFDs) are power control devices that utilize frequency conversion and microelectronics technology to control AC motors by varying the motor's operating frequency. Contactors are commonly used electrical components in VFD control, primarily used to switch buffer resistors and connect and disconnect circuits. The correct selection of contactors directly impacts the VFD's operation and quality, the operating conditions of electrical equipment, and ultimately the smooth operation, safety, and stability of the entire installation. Most existing VFDs utilize AC contactors for control, which imposes high environmental requirements and can easily cause damage due to the three-phase input connection to the mains. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a high-current DC contactor for a frequency converter series. The high-current DC contactor for a frequency converter series completely encloses the electromagnetic system and the contact system in an insulating outer cover, which can effectively improve the insulation performance and dustproof performance requirements, and can also work normally in an environment with high temperature and high dust.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a high-current DC contactor for a frequency converter series, comprising a coil assembly; an iron core is inserted into the coil assembly, a core rod is fixed through the top of the iron core, and a dynamic contact piece assembly is mounted on the upper part of the core rod; the coil assembly is fixed in an outer cover, a static contact piece assembly is provided on the outer cover to match the dynamic contact piece assembly, and a terminal of the static contact piece assembly is led out of the outer cover; a cap is provided on the outer cover, and the outer cover and the cap are relatively movable, and the inner cavity formed by the outer cover and the cap is closed and insulated.

[0006] The static contact piece assembly is divided into two sections, each section leads to a terminal, and the dynamic contact piece assembly contacts the static contact piece assembly to connect the two sections of the static contact piece assembly.

[0007] The top end of the iron core is fixed to the cap by a split pin, and a contact spring is arranged between the inner wall of the cap and the moving contact piece assembly.

[0008] The top end and the bottom end of the contact spring are respectively provided with an adjusting washer and a bowl-shaped washer.

[0009] The iron core is divided into two sections, an upper section and an lower section, and the core rod is fixed to the upper section.

[0010] A return spring is mounted on the core rod, and the upper and lower ends of the return spring are respectively fixed to the upper and lower sections of the iron core.

[0011] A bottom plate is fixed on the top of the coil assembly.

[0012] The coil assembly is wrapped with an iron yoke assembly.

[0013] A cavity space for magnetic arc blowing out is reserved at the position of the cap on the side of the moving contact piece assembly.

[0014] The beneficial effects of the present invention are: the electromagnetic system and the contact system are completely enclosed in an insulating outer cover, which can effectively improve the insulation performance and dustproof performance requirements, and can work normally even in an environment with high temperature and high dust, and can be widely used in inverters; the position for magnetic arc extinguishing is reserved on the side of the contact, which can effectively further improve the load capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] In the figure: 1- iron yoke assembly, 2- coil assembly, 3- return spring, 4- iron core, 5- bottom plate, 6- adjusting washer, 7- cotter pin, 8- contact spring, 9- bowl-shaped washer, 10- cap cover, 11- seat plate assembly, 12- moving contact piece assembly, 13- cap brim piece, 14- core rod, 15- outer cover. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0018] like Figure 1 The high-current DC contactor shown is used in a frequency converter series and includes a coil assembly 2; an iron core 4 is inserted into the coil assembly 2, a core rod 14 is fixed on the top of the iron core 4, and a movable contact piece assembly 12 is mounted on the upper portion of the core rod 14; the coil assembly 2 is fixed in an outer cover 15, and a static contact piece assembly is provided on the outer cover 15 to match the movable contact piece assembly 12, and the static contact piece assembly has terminal leads outside the outer cover 15; a cap 10 is provided on the outer cover 15, and the outer cover 15 and the cap 10 are movable relative to each other, and the inner cavity formed by the outer cover 15 and the cap 10 is closed and insulated.

[0019] The static contact piece assembly is divided into two sections, each section leads to a terminal, and the dynamic contact piece assembly 12 contacts the static contact piece assembly to connect the two sections of the static contact piece assembly.

[0020] The top end of the iron core 4 is fixed to the cap 10 through a cotter pin 7 , and a contact spring 8 is installed between the inner wall of the cap 10 and the moving contact piece assembly 12 .

[0021] The top and bottom ends of the contact spring 8 are respectively provided with an adjusting washer 6 and a bowl-shaped washer 9 .

[0022] The core 4 is divided into two sections, an upper section and an lower section, with the core rod 14 fixed to the upper section.

[0023] A return spring 3 is mounted on the core rod 14 , and the upper and lower ends of the return spring 3 are fixed to the upper and lower sections of the iron core 4 respectively.

[0024] A bottom plate 5 is fixed on the top of the coil assembly 2 .

[0025] The coil assembly 2 is wrapped with the iron yoke assembly 1 .

[0026] A cavity space for magnetic arc blowing out is reserved at the position of the cap 10 on the side of the dynamic contact piece assembly 12 .

[0027] Example 1

[0028] Using the above solution, if Figure 1 As shown, the static contact piece assembly is fixed to the base plate assembly 11 , a brim piece 13 is provided between the iron core 4 and the cap cover 10 , and the top end of the core rod 14 is fixed to the cap cover 10 through a cotter pin 7 .

[0029] Therefore, the connecting piece on the DC contactor base plate assembly is the coil connection input terminal, the contactor is powered on, the product reaches the operating voltage, the product's moving contact piece assembly 12 and the static contact piece assembly on the base plate assembly 11 are in a closed state, the product's contact system is closed, that is, the load is in a closed state; the product is disconnected from the power supply or reaches the product release voltage, the product's moving contact piece assembly 12 and the static contact piece assembly on the base plate assembly 11 are in a disconnected state, the contact system is disconnected, that is, the product is in a disconnected state.

[0030] The present invention can be directly installed on the casing, its insulation performance is guaranteed, its stability is enhanced, and the safety of the inverter is improved; the electromagnetic system and the contact system are both enclosed in the outer cover, which can effectively solve the shortcomings of the dustproof performance requirements of the inverter and enhance the reliability of the product, and can fully meet the inverter requirements during application.

[0031] The coil wiring input terminal can be operated by connecting the rated voltage or the product operating voltage, and the operating time is ≤10ms. The appearance and volume can be much smaller than similar products (130mm×82.7mm×108mm), and the volume is small enough. In practical tests, the rated load is 600A×24DC, the electrical life is ≥50,000 times, and the maximum can reach 600A×60V DC. The appearance and volume, workmanship quality, overall appearance, insulation dielectric strength, vibration resistance, impact resistance, and low power consumption parameters are all excellent, and the stability is enhanced.

Claims

1. A high current DC contactor for a frequency converter series, comprising a coil assembly (2), characterized in that: The coil assembly (2) is inserted with an iron core (4), the top of the iron core (4) passes through a fixed core rod (14), and the upper part of the core rod (14) is installed with a dynamic contact piece assembly (12); the coil assembly (2) is fixed in an outer cover (15), and a static contact piece assembly is provided on the outer cover (15) to match the dynamic contact piece assembly (12), and the static contact piece assembly leads to a terminal outside the outer cover (15); a cap (10) is provided on the outer cover (15), and the outer cover (15) and the cap (10) are relatively movable, and the inner cavity formed by the outer cover (15) and the cap (10) is closed and insulated; the static contact piece assembly is divided into two sections, each section leads to a terminal, and the dynamic contact piece assembly (12) contacts the static contact piece assembly to connect the two sections of the static contact piece assembly; a cavity space for magnetic arc blowing is reserved at the position of the cap (10) located on the side of the dynamic contact piece assembly (12).

2. The high current DC contactor for a frequency converter series according to claim 1, characterized in that: The top end of the iron core (4) is fixed to the cap (10) through a split pin (7), and a contact spring (8) is installed between the inner wall of the cap (10) and the moving contact piece assembly (12).

3. The high current DC contactor for a frequency converter series according to claim 2, characterized in that: The top end and the bottom end of the contact spring (8) are respectively provided with an adjusting washer (6) and a bowl-shaped washer (9).

4. The high current DC contactor for a frequency converter series according to claim 1, characterized in that: The iron core (4) is divided into two sections, an upper section and an lower section, and the core rod (14) is fixed to the upper section.

5. The high current DC contactor for a frequency converter series according to claim 4, characterized in that: A return spring (3) is mounted on the core rod (14), and the upper and lower ends of the return spring (3) are respectively fixed to the upper and lower sections of the iron core (4).

6. The high current DC contactor for a frequency converter series according to claim 1, characterized in that: A bottom plate (5) is fixed on the top of the coil assembly (2).

7. The high current DC contactor for a frequency converter series according to claim 1, characterized in that: The coil assembly (2) is externally wrapped with an iron yoke assembly (1).

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