Primary contact system for drawer type switch cabinet

Abstract

The utility model provides a primary contact system for a drawer type switch cabinet. The primary contact system comprises a contact connector, a locking assembly and a primary pin. The contact connector is provided with a first clamping head and a second clamping head. The locking assembly is used for locking clamping connection between a first clamping head of the contact connector and a vertical bus of the drawer type switch cabinet, the first clamping head is electrically connected with the vertical bus in a clamping mode in the first direction, the vertical bus extends in the second direction, and the first direction is perpendicular to the second direction. The primary pin is electrically connected with the contact connector, and the second chuck of the contact connector is in clamping connection with the first end of the primary pin. According to the utility model, components used in the contact system can be replaced conveniently, rapidly and flexibly. The contact connector is fixedly connected with the vertical bus by using the locking assembly, so that the vertical bus cannot be abraded, and the vertical bus can be maintenance-free. Meanwhile, the device can be suitable for drawer units with various different current specifications, and is flexible and convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power engineering, and in particular relates to a primary contact system for a drawer-type switch cabinet and a drawer-type switch cabinet comprising the same. Background Art

[0002] Low-voltage drawer switchgear (LVDS) is a type of low-voltage switchgear commonly used in power engineering. It is primarily used in low-voltage power distribution systems to control, protect, convert, and distribute electrical energy. LVDS typically consists of multiple independent drawer units, each capable of independent operation. Currently, LVDS are widely used in power plants, buildings, semiconductors, and data centers.

[0003] The primary contact system is a key component of low-voltage drawer cabinets. Traditional primary contact systems utilize an integrated structure fixed to the drawer unit. This structure presents drawbacks such as inconvenient replacement, installation, and maintenance of the primary contacts (or primary pins). Because the vertical busbars and primary contacts are connected by a sliding connection, movement of the drawer unit causes relative movement between the primary contacts and the vertical busbars, leading to wear on both. This reduces contact reliability, increases temperature rise, and can cause interphase insulation failures that can burn out the vertical busbars. Utility Model Content

[0004] According to a first aspect of the present utility model, a primary contact system for a drawer-type switch cabinet is provided, comprising: a contact connector having a first clamp and a second clamp; a locking assembly for locking the clamping connection between the first clamp of the contact connector and a vertical busbar of the drawer-type switch cabinet, wherein the first clamp is electrically clamped and connected to the vertical busbar along a first direction, the vertical busbar extends along a second direction, and the first direction is perpendicular to the second direction; and a primary pin electrically connected to the contact connector, the second clamp of the contact connector being clamped and connected to the first end of the primary pin.

[0005] Preferably, the clamping connection between the second clamp of the contact connector and the first end of the primary pin has a first release force, and the clamping connection between the first clamp of the contact connector and the vertical busbar has a second release force, and the first release force is smaller than the second release force.

[0006] Preferably, a plurality of concave grooves are provided on one side of the locking assembly, and the plurality of vertical busbars are clamped by the plurality of concave grooves to arrange the vertical busbars on the first cabinet panel of the drawer-type switch cabinet and constrain the position of the vertical busbars on the first cabinet panel.

[0007] Preferably, a plurality of connector holes are provided on the other side of the locking assembly, and each of the connector holes is provided with a snap-fit structure for use with the contact connector; the first clamp of the contact connector passes through the connector hole and is connected to the locking assembly using the snap-fit structure; after the first clamp of the contact connector passes through the connector hole, it clamps the vertical busbar.

[0008] Preferably, a buckle structure for use with the socket is provided at a middle portion of the contact connector between the first clamp and the second clamp.

[0009] Preferably, the first clamping head is composed of a first clamping arm and a second clamping arm, and a buckle structure for use with the connecting hole is provided on the outer side of the first clamping arm and the second clamping arm.

[0010] Preferably, the first clamp consists of a first clamp arm and a second clamp arm, and protrusions are provided on the outer sides of the first clamp arm and the second clamp arm; a plurality of sockets are provided on the other side of the locking assembly, and the first clamp of the contact connector clamps the vertical bus after passing through the socket, and the protrusion is clamped on the outer edge of the opening of the socket to realize the connection between the contact connector and the locking assembly.

[0011] Preferably, the locking assembly is a vertical busbar clamp.

[0012] Preferably, it further includes a pin mounting seat, to which the second end of the primary pin is connected; the pin mounting seat is arranged on the second cabinet plate of the drawer-type switch cabinet; wherein the first cabinet plate and the second cabinet plate move relative to each other along the drawer track direction.

[0013] According to a second aspect of the present invention, a drawer-type switch cabinet is provided, comprising any one of the primary contact systems for a drawer-type switch cabinet described in the first aspect.

[0014] Compared to existing technologies, this utility model provides a split, modular primary contact system design that allows for quick, convenient, and flexible replacement of contact system components. By using a locking assembly to securely connect the contact connector to the vertical busbar, wear and tear on the vertical busbar is eliminated, making the vertical busbar maintenance-free. By adjusting the number of contact connectors and corresponding pins, it can be adapted to various drawer units with different current specifications, providing flexibility and convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0016] Figure 1 It is a schematic diagram of the structural disassembly of a primary contact system according to an embodiment of the present utility model.

[0017] Figure 2 It is a schematic diagram of the connection structure between the locking assembly and the vertical busbar according to an embodiment of the utility model.

[0018] Figure 3 It is a schematic diagram of the connection structure between the locking assembly and the contact connector according to an embodiment of the present utility model.

[0019] Figure 4 It is a cross-sectional schematic diagram of an assembled primary contact system according to an embodiment of the present utility model.

[0020] Figure 5 It is a schematic diagram of the structural relationship between the drawer unit and the primary contact system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. In the various drawings, the same reference numerals represent the same components. It should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the present invention.

[0022] Low-voltage drawer cabinets are highly modular and flexible low-voltage switchgear widely used in power engineering. The following describes the main structural components of low-voltage drawer cabinets. They primarily consist of a cabinet body, busbars, instruments, contact systems, and drawer units. The cabinet body serves as the switchgear's outer shell and framework, as well as internal mounting and support components. It is typically constructed from C-section steel, and all structural components are galvanized for corrosion resistance. Busbars are divided into horizontal and vertical busbars, serving as low-impedance conductors that connect circuits. Horizontal busbars connect to distribution buses or incoming and outgoing line units. Vertical busbars connect to the horizontal busbars and supply power to instruments, contact systems, and other components. Drawer units are the core components of low-voltage drawer cabinets, operating independently and available in a variety of sizes. The contact system is a key component of the drawer cabinet, primarily responsible for the transmission and distribution of electrical energy. Contact quality (also known as primary contacts) is a critical quality control point for low-voltage drawer cabinets. Design, installation, and maintenance issues can lead to burnout of drawer contacts, impacting continuous operation. At present, it is common to design the vertical busbar clamp and the contact connector as an integrated whole, and the primary contact is connected to the vertical busbar in a sliding manner. In actual application, the inventors of the utility model found that the integrated design is not conducive to the replacement and maintenance of components, and cannot be expanded into a drawer solution with multiple current specifications. When the drawer unit moves from the working position to the test or separation position, or from the test or separation position to the working position, the primary contact will move relative to the vertical busbar, causing wear on both, resulting in reduced contact reliability and increased temperature rise. In severe cases, the mechanical and electrical properties of the insulating parts around the contacts may be damaged, resulting in interphase insulation failure and burning of the vertical busbar. At this time, the vertical busbar and other components need to be replaced.

[0023] To address the above issues, the present invention provides a split, modular primary contact system design that allows for quick, convenient, and flexible replacement of components within the contact system. By using a locking assembly to securely connect the contact connector to the vertical busbar, wear and tear is eliminated, rendering the vertical busbar maintenance-free. By adjusting the number of contact connectors and corresponding pins, the system can be adapted to accommodate a variety of drawer units with varying current specifications, providing flexibility and convenience.

[0024] Figure 1 This is a schematic diagram of the disassembly of the structure of the primary contact system according to an embodiment of the present utility model. Figure 1As shown, an embodiment of the utility model provides a primary contact system, including: a contact connector 101, a locking assembly 103 and a primary pin 104. The contact connector 101 has a first clamp 1011 and a second clamp 1012. The structures of the first clamp 1011 and the second clamp 1012 can be the same or different. The first clamp 1011 of the contact connector 101 is clamped and connected to the vertical bus 102 of the drawer cabinet. The locking assembly 103 locks the clamping connection between the first clamp 1011 and the vertical bus 102. The first clamp is electrically clamped and connected to the vertical bus along a first direction, and the vertical bus extends along a second direction, and the first direction is perpendicular to the second direction. The second clamp 1012 of the contact connector 101 is clamped and connected to the first end of the primary pin 104. The split modular design can easily and quickly replace components in the contact system. By using a locking assembly to lock the clamping connection between the contact connector and the vertical busbar, relative movement between the clamp and the vertical busbar due to a sliding connection can be avoided, which could cause wear on the vertical busbar. By adjusting the number of contact connectors and corresponding pins, it can be adapted to various drawer units with different current specifications, providing flexibility and convenience. The identical structure of the first and second clamps simplifies the contact connector's structure, simplifying the manufacturing process and reducing production costs.

[0025] In some embodiments, the clamping connection between the second clamp 1012 of the contact connector 101 and the first end of the primary pin 104 has a first release force, while the clamping connection between the first clamp 1011 of the contact connector 101 and the vertical busbar 102 has a second release force, with the first release force being less than the second release force. This allows the contact connector to be disengaged from the primary pins while maintaining contact with the vertical busbar. This prevents wear of the vertical busbar caused by friction between the clamp and the vertical busbar during disengagement, ensures reliable contact between the clamp and the vertical busbar, stabilizes temperature rise, and prevents mechanical and electrical damage to insulating components surrounding the contacts.

[0026] Figure 2 This is a schematic diagram of the connection structure between the locking assembly and the vertical busbar according to an embodiment of the present utility model. Figure 2 As shown, in some embodiments, a plurality of concave grooves 1031 are provided on one side of the locking assembly 103, and each concave groove 1031 can clamp a vertical busbar 102. The plurality of vertical busbars 102 are arranged on the first cabinet plate (not in the first cabinet plate) of the drawer-type switch cabinet. Figure 2 ), and constrain the position of the vertical busbar 102 on the first cabinet plate. This can avoid deformation or displacement of the vertical busbar that may occur during operation.

[0027] Figure 3 It is a schematic diagram of the connection structure between the locking assembly and the contact connector according to an embodiment of the present utility model. Figure 4 FIG is a cross-sectional view of the assembled primary contact system according to an embodiment of the present invention. Figure 3 and Figure 4 As shown, in some embodiments, the other side of the locking assembly 103 is provided with multiple connector holes 1032. Each connector hole 1032 is provided with a snap-fit structure for use with the contact connector 101. That is, the contact connector 101 is also provided with a corresponding snap-fit structure. The first clamp 1011 of the contact connector 101 passes through the connector hole 1032 and is fixedly connected to the locking assembly 103 using the snap-fit structure. After passing through the connector hole 1032, the first clamp 1011 of the contact connector 101 clamps the vertical busbar 102. The snap-fit structure can lock the clamping connection between the contact connector and the vertical busbar, preventing the clamp from easily disengaging from the vertical busbar. Regarding the provision of the snap-fit structure, in some embodiments, a snap-fit structure for use with the connector hole 1032 is provided on the outer side of the middle portion of the contact connector between the first clamp 1011 and the second clamp 1012. In some embodiments, the first clamp 1011 is composed of a first clamp arm and a second clamp arm, and a buckle structure for use with the connector is provided on the outer side of the first clamp arm and the second clamp arm.

[0028] In some embodiments, protrusions are provided on the outer sides of the first and second clamping arms. After the first clamping head 1011 of the contact connector 101 passes through the socket 1032, it clamps the vertical busbar 102 and engages the protrusions on the outer edge of the socket 1032 opening. By engaging the outer sides of the first and second clamping arms on the outer edge of the socket opening, the contact connector is connected to the locking assembly, thereby preventing the clamping head from easily disengaging from the vertical busbar.

[0029] In some embodiments, the multiple connectors 1032 of the locking assembly 103 are arranged horizontally along the locking assembly, with each row containing one or more connectors 1032. Arranging multiple connectors in the same longitudinal direction allows for staggered placement of contact connectors, improving space utilization within the drawer cabinet. Furthermore, multiple contact connectors can be installed to accommodate higher current drawer units.

[0030] In some embodiments, the locking assembly 103 is a vertical busbar clamp.

[0031] Figure 5 Schematic diagram of the structural relationship between the drawer unit and the primary contact system according to an embodiment of the present utility model. Figure 5 As shown, in some embodiments, the primary contact system further includes a pin mounting seat 105, and the second end of the primary pin 104 is connected to the pin mounting seat 105. Figure 5In some embodiments, the pin mounting base 105 is mounted on the second panel 202 of a drawer-type switchgear. The first panel 201 and the second panel 202 move relative to each other along the drawer rails. When the drawer unit is pushed to the operating position, the primary pins 104 connect with the second clamping head 1012 of the contact connector 101. The primary pins are fixedly mounted on the insulating base and integrally attached to the drawer unit, connecting the incoming and outgoing cables or busbars of the circuit breaker.

[0032] In some embodiments, the number of contact connectors is set according to the number of primary pins. By adjusting the number of contact connectors and corresponding pins, it can be applied to drawer units of various current specifications, which is flexible and convenient.

[0033] In this embodiment of the utility model, both the contact connector and primary pins utilize a modular design, facilitating easy installation and maintenance. A locking assembly secures the contact connector to the vertical busbar, ensuring that the contact connector's clamping pins do not abrade the vertical busbar when the drawer unit is inserted and removed, rendering the vertical busbar maintenance-free. By increasing the number of contact connectors and primary pins, the drawer can be expanded to accommodate various current specifications (15A to 630A).

[0034] Based on the contents of the above embodiments, an embodiment of the present utility model further provides a drawer-type switch cabinet, which includes the primary contact system in any of the above embodiments.

[0035] Although the present invention has been described through preferred embodiments, the present invention is not limited to the embodiments described herein, and includes various changes and modifications that may be made without departing from the scope of the present invention.

Claims

1. A primary contact system for a drawer-type switch cabinet, characterized in that: include a contact connector having a first clamp and a second clamp; a locking assembly for locking the clamping connection between the first clamp of the contact connector and the vertical busbar of the drawer-type switchgear, wherein the first clamp electrically clamps the vertical busbar along a first direction, the vertical busbar extends along a second direction, and the first direction is perpendicular to the second direction; and A primary pin is electrically connected to the contact connector, and the second clamp of the contact connector is clamped and connected to the first end of the primary pin.

2. The primary contact system according to claim 1, characterized in that: The clamping connection between the second clamp of the contact connector and the first end of the primary pin has a first release force, and the clamping connection between the first clamp of the contact connector and the vertical busbar has a second release force, and the first release force is smaller than the second release force.

3. The primary contact system according to claim 1, characterized in that: A plurality of concave grooves are provided on one side of the locking assembly, and the plurality of vertical busbars are clamped by the plurality of concave grooves to arrange the vertical busbars on the first cabinet panel of the drawer-type switch cabinet and constrain the position of the vertical busbars on the first cabinet panel.

4. The primary contact system according to claim 3, characterized in that: A plurality of sockets are provided on the other side of the locking assembly, and a buckle structure for use with the contact connector is provided in each socket; The first clamp of the contact connector passes through the connector hole and is connected to the locking assembly using the buckle structure; After the first clamp of the contact connector passes through the socket, it clamps the vertical busbar.

5. The primary contact system according to claim 4, characterized in that: A buckle structure used in conjunction with the socket is provided at the middle portion of the contact connector between the first clamp and the second clamp.

6. The primary contact system according to claim 4, characterized in that: The first clamping head is composed of a first clamping arm and a second clamping arm. A buckle structure used in conjunction with the connecting hole is provided on the outer sides of the first clamping arm and the second clamping arm.

7. The primary contact system according to claim 3, characterized in that: The first clamping head is composed of a first clamping arm and a second clamping arm, and a protrusion is provided on the outer side of the first clamping arm and the second clamping arm; A plurality of connector holes are provided on the other side of the locking assembly. The first clamp of the contact connector passes through the connector hole and clamps the vertical bus bar, and the protrusion is clamped on the outer edge of the opening of the connector hole to realize the connection between the contact connector and the locking assembly.

8. The primary contact system according to any one of claims 1 to 7, characterized in that: The locking assembly is a vertical busbar clamp.

9. The primary contact system according to claim 3, characterized in that: It also includes a pin mounting seat, and the second end of the primary pin is connected to the pin mounting seat; The pin mounting seat is arranged on the second cabinet plate of the drawer-type switch cabinet; Wherein, the first cabinet panel and the second cabinet panel move relative to each other along the drawer track direction.

10. A drawer-type switch cabinet, characterized in that: The present invention comprises a primary contact system for a drawer-type switch cabinet as described in any one of claims 1 to 9.

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