A heat dissipation structure of a double-gas chamber gas insulated switch cabinet

Abstract

The utility model discloses a heat dissipation structure of double gas chamber gas insulation cubical switchboard, its characterized in that, include: the through gas chamber partition wall bushing, the bushing includes a bushing conductor, the bushing conductor inside hollow, be provided with epoxy bushing outside the bushing conductor, through the epoxy bushing is located in the installation position cooperation sealing assembly of bushing to the gas chamber partition wall and is limited, the first end portion outside of bushing conductor is provided with a plurality of first contactor slot, and the first end portion of bushing conductor is installed in cooperation with the contactor connecting portion of three position switch, the second end portion outside of bushing conductor is provided with a plurality of second contactor slot, and the second end portion of bushing conductor is installed in cooperation with the static contact seat of circuit breaker, the utility model relates to heat dissipation structure can simplify the connection mode between three position and circuit breaker, reduce the number of bus bar lap joint, reduce the use amount of copper row, improve circuit breaker static end heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of industrial electrical cabinets, specifically to a heat dissipation structure for a dual-chamber gas-insulated switch cabinet. Background Technology

[0002] In existing gas-insulated switchgear, the circuit breaker terminals are mostly flat, and are led out to other components through connecting blocks. The connection between the two is mostly fastened directly with bolts (some circuit breaker terminals have steel wire threaded sleeves in the fastening holes). The connecting blocks after being led out are then connected to wall bushings to complete the connection between one side of the circuit breaker and the other gas chamber transition components (mostly through wall bushings).

[0003] Then, by connecting the other side of the through-wall bushing to a three-position switch via a connecting row, the circuit breaker in one gas chamber is ultimately connected to the three-position switch in another gas chamber. This connection method is currently the mainstream layout method both domestically and internationally.

[0004] Its advantages lie in the flexible overall structure and wide range of components available for the gas-insulated switchgear; its disadvantages are that the interconnection increases the internal resistance of the busbars and the number of contact surfaces, resulting in increased overall internal resistance and heat generation.

[0005] The main challenge in the temperature rise test of gas-insulated switchgear lies in the circuit breaker and three-position switch. Heat dissipation at these locations has always been a concern for the heat dissipation of gas-insulated switchgear, especially when the rated current is above 2500A.

[0006] Common solutions often involve adding aluminum heat dissipation brackets to the circuit breaker terminals, increasing the conductor cross-section of the circuit breaker terminals, and adding heat dissipation holes to the epoxy poles of the circuit breaker. Some gas-insulated switchgear even abandons the epoxy-sealed structure with its electric field advantage and adopts a circuit breaker with an exposed vacuum tube support structure. These solutions fundamentally fail to address the problem of heat accumulation in the upper part of the gas tank, which prevents the rapid release and transfer of heat. Utility Model Content

[0007] In order to overcome the above-mentioned defects of the prior art, the purpose of this utility model is to provide a heat dissipation structure for a dual-chamber gas-insulated switchgear.

[0008] This utility model is used to meet the structural layout and connection method of the internal components of a sealed gas-insulated switchgear, thereby improving heat dissipation, reducing material usage and energy consumption, and solving the problem of heat dissipation difficulty in the main components of the gas box, such as the circuit breaker terminals and wall bushings.

[0009] A heat dissipation structure for a dual-chamber gas-insulated switchgear includes:

[0010] A through-wall sleeve penetrating the air chamber partition, the through-wall sleeve comprising a hollow conductor.

[0011] An epoxy sleeve is provided outside the sleeve conductor;

[0012] The epoxy sleeve, in conjunction with the sealing component, limits the installation position of the through-wall sleeve on the gas chamber partition.

[0013] The outer side of the first end of the bushing conductor is provided with a plurality of first contact slots, and the first end of the bushing conductor is fitted with the contact connection part of the three-position switch.

[0014] The outer side of the second end of the bushing conductor is provided with several second contact slots, and the second end of the bushing conductor is installed in conjunction with the stationary contact seat of the circuit breaker.

[0015] In a preferred embodiment of this utility model, the sealing component is a sealing ring, which is installed in the sealing ring groove of the epoxy sleeve.

[0016] In a preferred embodiment of the present invention, a limiting part is provided at the first end of the sleeve conductor near the first contact slot, and the first end of the sleeve conductor is installed with the contact connection part of the three-position switch through the limiting part and the first contact slot.

[0017] In a preferred embodiment of the present invention, a second sealing ring groove is provided at the second end of the bushing conductor near the second contact groove, and a second sealing ring is provided in the second sealing ring groove to seal and fit with the sealing plate surface of the circuit breaker stationary contact seat.

[0018] In a preferred embodiment of this utility model, when the three-position switch is closed, the conductor part is a hollow through structure and the tubular conductor of the three-position switch is provided with heat dissipation holes around it.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model relates to a heat dissipation structure that simplifies the connection between the three-position circuit breaker and the circuit breaker, reduces the number of busbar overlaps, decreases the amount of copper busbar used, and improves the heat dissipation effect of the circuit breaker's stationary end. By using a three-position contact tube connector that is coaxial with the circuit breaker's stationary end and connecting via a strap or spring contact, the connection structure is simplified. The bushing conductor is adjusted to a tubular structure, and with the help of a sealing ring, it achieves gas isolation from the lower circuit breaker compartment. Simultaneously, the tubular busbar channel rapidly conducts heat from the circuit breaker's stationary contact base to the upper air chamber for heat dissipation through conduction and convection. This heat dissipation structure involves a simple bushing structure, convenient installation, mature connection methods and sealing technology, and low implementation difficulty. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1.

[0022] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0023] Figure 3 This is a schematic diagram of the heat dissipation structure and airflow of this utility model. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the scope of the present utility model. Furthermore, in the following descriptions, well-known structures and technologies have been omitted to avoid unnecessary confusion regarding the concept of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In existing technologies, the gas chambers of the circuit breaker and the three-position switch in gas-insulated switchgear are independent of each other. This arrangement is a common technical solution. However, the upper and lower chamber layout makes heat dissipation difficult in the lower chamber, with most of the heat accumulating at the top of the gas box and the terminal blocks (the heat source, where contact resistance exists). Within the gas-insulated switchgear, the main heat source in the lower chamber is the circuit breaker, which is also the challenge in temperature rise testing. Some of the heat generated in the lower chamber is dissipated through the surrounding enclosure and bottom, while some is transferred to the upper chamber through the partition between the upper and lower chambers (heat in the lower chamber generally rises, so it can only be transferred upwards via thermal conduction), resulting in slow heat transfer. The majority of the heat accumulates at the top of the gas box and the terminal blocks, causing the temperature of the circuit breaker stationary contacts in the upper part of the lower chamber to be generally higher. Simply increasing the heat dissipation area at the stationary contacts is insufficient to reduce the temperature rise at this location.

[0027] To overcome the above-mentioned defects, this utility model provides the following: Figure 1-2 The heat dissipation structure of a dual-chamber gas-insulated switchgear shown includes a through-wall bushing that penetrates the gas chamber partition 7. The through-wall bushing includes a bushing conductor 100, which is hollow inside.

[0028] The sheath conductor 100 is not limited to the shape of round tubes, rectangular tubes, etc., but is mainly hollow in structure, and the internal channels can realize gas convection.

[0029] An epoxy sleeve 3 is provided outside the sleeve conductor 100. The epoxy sleeve 3, together with the sealing component 2, limits the installation position of the through-wall sleeve on the gas chamber partition 7. The sealing component 2 is a sealing ring, which is installed in the sealing ring groove 4 of the epoxy sleeve 3.

[0030] The outer side of the first end of the bushing conductor 100 is provided with a plurality of first contact slots 101, and the first end of the bushing conductor 100 is fitted with the contact connection part 61 of the three-position switch 6.

[0031] Specifically, a limiting part 2 is provided at the first end of the sleeve conductor 100 near the first contact slot 101, and the first end of the sleeve conductor 100 is installed with the contact connection part 61 of the three-position switch 6 through the limiting part 2 and the first contact slot 101.

[0032] The second end of the bushing conductor 100 is provided with a plurality of second contact slots 102 on the outer side, and the second end of the bushing conductor 100 is installed in conjunction with the stationary contact seat 10 of the circuit breaker 9.

[0033] A second sealing ring groove 5 is provided at the second end of the bushing conductor 100 near the second contact groove 102. A second sealing ring 51 is installed in the second sealing ring groove 5 and is sealed to the sealing surface 11 of the circuit breaker stationary contact seat 10. The installation of the sealing ring achieves the isolation of gas in the upper and lower gas chambers.

[0034] When the three-position switch 6 is in the closed state, the conductor part is a hollow through structure and the tubular conductor of the three-position switch is provided with heat dissipation holes around it.

[0035] Key points combined Figure 3 The heat dissipation structure of the dual-chamber gas-insulated switchgear acts on the heat transfer between the two chambers (as indicated by the arrow). A heat dissipation duct is set in one chamber and enters the other chamber, accelerating the heat transfer through convection and other means to achieve heat dissipation in the other chamber or localized areas.

[0036] The bushing conductor is directly connected to the upper and lower air chambers via contacts or busbars, ensuring continuous conductivity. Each side of the conductor has one or more contact slots for installing contacts to connect the conductors; the number of slots depends on the number of contacts installed, which in turn depends on the magnitude of the current being carried.

[0037] Steps can be set on both sides of the bushing conductor for installation limit, to support three-position switches or circuit breakers, etc., while increasing the contact area. Limit fixing points can be selectively added around the perimeter (fixed by bolts, etc., to reduce contact resistance).

[0038] The heat dissipation structure incorporates airflow into the main components of the heat source, with interfaces or slots provided at the heat source location to achieve conductive connections and facilitate gas convection.

[0039] The heat dissipation air duct that is introduced into the system and then introduced externally is connected to the external air duct to form an airflow channel, thereby achieving the function of air extraction.

[0040] The continuous flow of the channel forms a bottom-up heat dissipation structure airflow. Figure 3 By utilizing the physical characteristics of heat generation at the stationary contact of a circuit breaker and the upward flow of hot air, the heat at the stationary contact can be drawn upwards. The heat is then rapidly transferred to the upward air box via a heat dissipation structure duct. At the same time, cooler gas is introduced to supplement the flow, forming convection and solving the problem of heat dissipation difficulty at the upper stationary contact of the circuit breaker.

[0041] The above shows and describes the basic principles, main features, and advantages of this utility model.

[0042] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of this utility model as defined by the appended claims and their equivalents.

Claims

1. A heat dissipation structure for a dual-chamber gas-insulated switchgear, characterized in that, include: A through-wall sleeve is provided through the gas chamber partition. The through-wall sleeve includes a sleeve conductor. The sleeve conductor is hollow inside. An epoxy sleeve is provided outside the sleeve conductor. The epoxy sleeve, in conjunction with the sealing component, limits the installation position of the through-wall sleeve on the gas chamber partition. The outer side of the first end of the bushing conductor is provided with a plurality of first contact slots, and the first end of the bushing conductor is fitted with the contact connection part of the three-position switch. The outer side of the second end of the bushing conductor is provided with several second contact slots, and the second end of the bushing conductor is installed in conjunction with the stationary contact seat of the circuit breaker.

2. The heat dissipation structure of a dual-chamber gas-insulated switchgear as described in claim 1, characterized in that, The sealing component is a sealing ring, which is installed in the sealing ring groove of the epoxy sleeve.

3. The heat dissipation structure of a dual-chamber gas-insulated switchgear as described in claim 1, characterized in that, The first end of the sleeve conductor is provided with a limiting part near the first contact slot, and the first end of the sleeve conductor is installed with the contact connection part of the three-position switch through the limiting part and the first contact slot.

4. The heat dissipation structure of a dual-chamber gas-insulated switchgear as described in claim 1, characterized in that, The second end of the bushing conductor is provided with a second sealing ring groove near the second contact groove. The second sealing ring is installed in the second sealing ring groove and is sealed and fitted with the sealing plate surface of the circuit breaker stationary contact seat.

5. The heat dissipation structure of a dual-chamber gas-insulated switchgear as described in claim 1, characterized in that, When the three-position switch is closed, the conductor part has a hollow through-structure and the tubular conductor of the three-position switch is provided with heat dissipation holes around it.

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