Heat dissipation structure for sealed low-voltage unit of box-type substation

Abstract

The utility model discloses a sealed low-voltage unit heat radiation structure of a box-type transformer station, which is applied to a windy and dusty environment or a coastal humid environment, and comprises a low-voltage unit closed shell, a low-voltage cabinet I, a low-voltage cabinet II, a heat exchanger and a middle busbar channel, and the low-voltage cabinet I and the low-voltage cabinet II are respectively arranged on two sides of an inner cavity of the low-voltage unit closed shell. The low-voltage cabinet I and the low-voltage cabinet II are oppositely arranged, each of the low-voltage cabinet I and the low-voltage cabinet II comprises a lower half cavity and an upper half cavity, a middle busbar channel is arranged at the upper part between the two low-voltage cabinet bodies, and a wind baffle plate is arranged in the low-voltage cabinet, so that airflow passes through heating elements such as a low-voltage main busbar and a low-voltage circuit breaker according to a guide path air duct; the arrangement of the guide air duct in the cabinet improves the circulation and replacement efficiency of airflow, and cooperates with the heat exchanger to perform indoor and outdoor heat exchange, so that efficient and energy-saving operation of the low-voltage unit is realized, meanwhile, indoor air is isolated from outdoor air, the influence of dust and salt mist brought by internal and external ventilation is avoided, and the product operation is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the field of new energy power generation equipment, in particular to a sealed low-voltage unit heat dissipation structure of a box-type transformer substation. Background Art

[0002] According to market demand research, more desert and offshore new energy photovoltaic power stations will be planned in the future. Harsh environments such as salt spray, wind and sand will place very strict requirements on the operating reliability and environmental adaptability of components in new energy equipment.

[0003] At present, commonly used low-voltage cabinets are generally arranged with components that meet the functions according to project requirements. The components and busbars need to rely on natural convection to exchange heat with the air in the cabinet, and then radiate heat with the external environment through the box. Some projects are used in dusty environments with low humidity, so direct ventilation can be used for heat dissipation. However, humid air will enter the low-voltage unit, condensation creepage will pose a hidden danger to the safe operation of the components. At the same time, the external air intake cannot effectively blow to the heat-generating components in the low-voltage cabinet. Even if the external circulation air volume is increased, the temperature rise of the hot spots in the cabinet is not significantly improved. Utility Model Content

[0004] In order to meet the use requirements of desert and coastal environments and match the heat dissipation needs inside the low-voltage unit, this utility model patent discloses a sealed low-voltage unit heat dissipation structure for a box-type substation.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the utility model is:

[0006] A sealed low-voltage unit heat dissipation structure of a box-type substation, comprising a low-voltage unit closed shell, a low-voltage cabinet I, a low-voltage cabinet II, a heat exchanger, and an intermediate busbar channel. The low-voltage cabinet I and the low-voltage cabinet II are arranged on both sides of the inner cavity of the low-voltage unit closed shell. The low-voltage cabinet I and the low-voltage cabinet II are arranged back to back. The low-voltage cabinet I and the low-voltage cabinet II both comprise a lower half chamber and an upper half chamber. An intermediate busbar channel is arranged at the upper part between the two low-voltage cabinets.

[0007] The lower chamber is provided with a low-voltage busbar I, and the left side of the upper chamber is provided with a circuit breaker chamber, in which a low-voltage circuit breaker is provided, and the outlet terminal of the low-voltage circuit breaker is connected to the low-voltage busbar I; a ventilation duct is provided at the upper end of the right side of the upper chamber, a ventilation hole I is provided between the circuit breaker chamber and the lower chamber, and a ventilation hole II is provided between the upper end of the circuit breaker chamber and the ventilation duct, and a return air duct and an outlet air duct are provided on the right side wall of the low-voltage cabinet I and the low-voltage cabinet II. The return air duct is provided at the upper end of the cabinet and is connected to the ventilation duct, and the outlet air duct is provided at the lower end of the cabinet and is connected to the right side of the lower chamber;

[0008] The heat exchanger is installed on the closed shell of the low-pressure unit, and its channel openings are respectively connected to the return air duct and the outlet air duct, so that heat exchange between the internal and external environments of the closed shell is achieved through the heat exchanger.

[0009] Furthermore, the intermediate busbar channel is provided with busbar II, the incoming line end of the low-voltage circuit breaker is connected to busbar II, an outlet hole is provided on the rear side of the circuit breaker chamber, the intermediate busbar channel is in a rectangular shape, an axial flow fan is provided on the right side, and a ventilation hole III is provided on the top of the intermediate busbar channel. The intermediate busbar channel is connected to the inner cavity of the closed shell of the low-voltage unit through the axial flow fan and the ventilation hole III to achieve air communication.

[0010] The busbar II and axial flow fans are both in two groups. The axial flow fans are blowing the busbar II. The busbar II is connected to the low voltage circuit breakers in the low voltage cabinet I and the low voltage cabinet II through the outlet holes.

[0011] The heat exchanger is a heat exchanger product of Fengruide brand model FRD-150W-C-01, with a heat transfer coefficient of 150W / K. The upper and lower channels are arranged on the inner side to communicate with the inner circulation exchange flow channel of the product, and two channels are arranged on the outer side to communicate with the outer circulation flow channel. The product is also provided with a temperature sensor.

[0012] Furthermore, a windshield partition is arranged between the upper chamber and the lower chamber, and a ventilation hole I is arranged below the circuit breaker chamber of the windshield partition to facilitate the cold air in the lower chamber to enter the circuit breaker chamber.

[0013] The ventilation duct is surrounded by closed partitions. The left side is connected to the circuit breaker chamber through ventilation hole II, and the right side is connected to the return air duct through the ventilation holes on the wall of the low-voltage cabinet.

[0014] The return air duct and the outlet air duct are provided with grid channels.

[0015] The beneficial effects of the utility model are as follows: the closed shell of the low-voltage unit is used in conjunction with the heat exchanger to exchange indoor and outdoor heat, so that the indoor air and outdoor air are completely isolated, avoiding the influence of dust and salt spray caused by internal and external ventilation, and the product operation is safer and more reliable. At the same time, the wind speed flow is dynamically adjusted according to the built-in temperature sensor of the heat exchanger, so as to realize the efficient and energy-saving operation of the low-voltage unit; a wind shield baffle is arranged next to the primary element and the busbar in the low-voltage cabinet to form an air flow channel, so that the airflow can flow through the heating components in the low-voltage cabinet according to the guide air duct, avoiding the diffusion of the airflow and improving the heat replacement efficiency of the airflow; an axial flow fan is arranged at the middle busbar channel to accelerate the air flow next to the busbar copper busbar in the channel and reduce the temperature rise of the busbar hot spot here. The structural design of the entire device is reasonable, which greatly improves the heat dissipation capacity inside the low-voltage unit and meets the use requirements of box transformers in desert and coastal environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal structure of an embodiment of the utility model;

[0017] Figure 2This is a schematic diagram of the top view of the structure of an embodiment of the utility model;

[0018] Figure 3 This is a right side structural schematic diagram of an embodiment of the utility model;

[0019] 1-low-voltage unit enclosed casing, 2-low-voltage cabinet I, 3-low-voltage cabinet II, 4-heat exchanger, 5-intermediate busbar channel, 6-circuit breaker chamber, 7-lower half chamber, 8-low-voltage circuit breaker, 9-ventilation duct, 10-wind shielding baffle, 11-return air duct, 12-air outlet duct, 13-channel opening, 14-axial flow fan, 15-busbar I, 16-busbar II. DETAILED DESCRIPTION

[0020] As attached Figure 1-3 A sealed low-voltage unit heat dissipation structure of a box-type substation is shown, which includes a low-voltage unit closed shell, a low-voltage cabinet I, a low-voltage cabinet II, a heat exchanger, and an intermediate busbar channel. The low-voltage cabinet I and the low-voltage cabinet II are arranged on both sides of the inner cavity of the low-voltage unit closed shell. The low-voltage cabinet I and the low-voltage cabinet II are arranged back to back. The low-voltage cabinet I and the low-voltage cabinet II both include a lower half chamber and an upper half chamber. An intermediate busbar channel is arranged at the upper part between the two low-voltage cabinets.

[0021] The lower chamber is provided with a low-voltage busbar I, and the left side of the upper chamber is provided with a circuit breaker chamber, in which a low-voltage circuit breaker is provided, and the outlet terminal of the low-voltage circuit breaker is connected to the low-voltage busbar I; a ventilation duct is provided at the upper end of the right side of the upper chamber, a ventilation hole I is provided between the circuit breaker chamber and the lower chamber, and a ventilation hole II is provided between the upper end of the circuit breaker chamber and the ventilation duct, and a return air duct and an outlet air duct are provided on the right side wall of the low-voltage cabinet I and the low-voltage cabinet II. The return air duct is provided at the upper end of the cabinet and is connected to the ventilation duct, and the outlet air duct is provided at the lower end of the cabinet and is connected to the right side of the lower chamber;

[0022] The heat exchanger is installed on the closed shell of the low-pressure unit, and its channel openings are respectively connected to the return air duct and the outlet air duct, so that heat exchange between the internal and external environments of the closed shell is achieved through the heat exchanger.

[0023] Furthermore, the intermediate busbar channel is provided with busbar II, the incoming line end of the low-voltage circuit breaker is connected to busbar II, an outlet hole is provided on the rear side of the circuit breaker chamber, the intermediate busbar channel is in a rectangular shape, an axial flow fan is provided on the right side, and a ventilation hole III is provided on the top of the intermediate busbar channel. The intermediate busbar channel is connected to the inner cavity of the closed shell of the low-voltage unit through the axial flow fan and the ventilation hole III to achieve air communication.

[0024] The busbar II and axial flow fans are both in two groups. The axial flow fans are blowing the busbar II. The busbar II is connected to the low voltage circuit breakers in the low voltage cabinet I and the low voltage cabinet II through the outlet holes.

[0025] The heat exchanger is a heat exchanger product of Fengruide brand model FRD-150W-C-01, with a heat transfer coefficient of 150W / K. The upper and lower channels are arranged on the inner side to communicate with the inner circulation exchange flow channel of the product, and two channels are arranged on the outer side to communicate with the outer circulation flow channel. The product is also provided with a temperature sensor.

[0026] Furthermore, a windshield partition is arranged between the upper chamber and the lower chamber, and a ventilation hole I is arranged below the circuit breaker chamber of the windshield partition to facilitate the cold air in the lower chamber to enter the circuit breaker chamber.

[0027] The ventilation duct is surrounded by closed partitions. The left side is connected to the circuit breaker chamber through ventilation hole II, and the right side is connected to the return air duct through the ventilation holes on the wall of the low-voltage cabinet.

[0028] The return air duct and the outlet air duct are provided with grid channels.

[0029] The lower chamber of this embodiment contains the low-voltage busbar I and the corresponding primary and secondary components. During operation under rated load, about 3KW of heat is generated, resulting in a relatively high temperature rise inside the low-voltage unit. Excessive local temperature will cause thermal damage to the insulation of internal components.

[0030] The closed guided heat dissipation structure seals the low-voltage unit, and an air outlet duct and a return air duct are arranged on the side of the low-voltage cabinet. The duct interface is aligned with the internal circulation inlet and outlet of the heat exchanger. At the same time, a wind shield baffle is arranged in the low-voltage cabinet, so that the cool air from the internal circulation outlet of the heat exchanger flows through the low-voltage main busbar I and the low-voltage circuit breaker with larger heat generation under the guidance of the wind shield baffle. The cool air passing through the heating conductor and the device rises and passes through the return air duct on the upper part of the low-voltage cabinet after being heated. The hot air exchanges heat with the external environment through the heat exchanger on the box body, and the temperature difference between the internal and external environments of the low-voltage unit is controlled within 10K. At the same time, the heat exchanger can dynamically adjust the wind speed and flow rate according to its built-in temperature sensor to reduce the operating energy consumption. In addition, an axial flow fan is arranged at the low-voltage busbar channel to accelerate the air flow beside the channel copper busbar at the end blind area of ​​the air duct to reduce the temperature rise of the busbar hot spot here.

[0031] The above is only a preferred embodiment of the present utility model. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principle of the present utility model. These improvements should also be regarded as within the scope of protection of the present utility model without paying creative labor.

Claims

1. A sealed low-voltage unit heat dissipation structure for a box-type substation, characterized in that: It includes a low-voltage unit closed shell, a low-voltage cabinet I, a low-voltage cabinet II, a heat exchanger, and an intermediate busbar channel. The low-voltage cabinet I and the low-voltage cabinet II are arranged on both sides of the inner cavity of the low-voltage unit closed shell. The low-voltage cabinet I and the low-voltage cabinet II are arranged back to back. The low-voltage cabinet I and the low-voltage cabinet II both include a lower half chamber and an upper half chamber. An intermediate busbar channel is arranged at the upper part between the two low-voltage cabinets. The lower chamber is provided with a low-voltage busbar I, and the left side of the upper chamber is provided with a circuit breaker chamber, in which a low-voltage circuit breaker is provided, and the outlet terminal of the low-voltage circuit breaker is connected to the low-voltage busbar I; a ventilation duct is provided at the upper end of the right side of the upper chamber, a ventilation hole I is provided between the circuit breaker chamber and the lower chamber, and a ventilation hole II is provided between the upper end of the circuit breaker chamber and the ventilation duct, and a return air duct and an outlet air duct are provided on the right side wall of the low-voltage cabinet I and the low-voltage cabinet II. The return air duct is provided at the upper end of the cabinet and is connected to the ventilation duct, and the outlet air duct is provided at the lower end of the cabinet and is connected to the right side of the lower chamber; The heat exchanger is installed on the closed shell of the low-pressure unit, and its channel openings are respectively connected with the return air duct and the outlet air duct.

2. The sealed low-voltage unit heat dissipation structure of a box-type substation according to claim 1, characterized in that: The middle busbar channel is provided with busbar II, the incoming line end of the low-voltage circuit breaker is connected to busbar II, an outlet hole is provided on the rear side of the circuit breaker chamber, the middle busbar channel is rectangular, an axial flow fan is provided on the right side, and a ventilation hole III is provided on the top of the middle busbar channel. The middle busbar channel is connected to the inner cavity of the closed shell of the low-voltage unit through the axial flow fan and the ventilation hole III to achieve air communication.

3. The sealed low-voltage unit heat dissipation structure of a box-type substation according to claim 2 is characterized in that: The busbar II and axial flow fans are both in two groups. The axial flow fans are blowing the busbar II. The busbar II is connected to the low voltage circuit breakers in the low voltage cabinet I and the low voltage cabinet II through the outlet holes.

4. The heat dissipation structure of sealed low-voltage unit of box-type substation according to claim 1 is characterized in that: The heat exchanger is a heat exchanger product of Fengruide brand model FRD-150W-C-01 with a heat transfer coefficient of 150W / K.

5. The sealed low-voltage unit heat dissipation structure of a box-type substation according to claim 1 is characterized in that: A windshield partition is arranged between the upper chamber and the lower chamber, and a ventilation hole I is arranged below the circuit breaker chamber of the windshield partition.

6. The sealed low-voltage unit heat dissipation structure of a box-type substation according to claim 1 is characterized in that: The ventilation duct is surrounded by closed partitions. The left side is connected to the circuit breaker chamber through ventilation hole II, and the right side is connected to the return air duct through the ventilation holes on the wall of the low-voltage cabinet.

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