High-frequency power supply filter capacitor heat dissipation structure for electric precipitation

Abstract

The utility model aims to solve the problems of poor heat dissipation efficiency and high equipment cost of a high-frequency power supply in the conventional electric precipitation. The high-frequency power supply filter capacitor heat dissipation structure comprises a plurality of filter capacitors and further comprises a capacitor mounting plate, a fixing plate and a heat dissipation device. Wherein the radiator comprises a plurality of radiating fins and a radiating base; the heat dissipation fins are regularly arranged on the heat dissipation base, and the heat dissipation fins are perpendicular to the base; the filter capacitors are fixedly arranged on the capacitor mounting plate, the capacitor mounting plate is arranged on the side surface of the radiator, and the filter capacitors on the capacitor mounting plate are close to the side surface of the radiator; the capacitor mounting plate is also fixedly connected with the fixing plate; the fixing plate is attached to a heat dissipation base of the heat dissipation device. And efficient heat dissipation of the fixed plate and the filter capacitors arranged on the two sides of the radiator is realized.

Description

Technical Field

[0001] The utility model relates to the field of inverter box structures, in particular to a high-frequency power supply filter capacitor heat dissipation structure for electric dust removal. Background Art

[0002] According to the "Emission Standards for Air Pollutants from Thermal Power Plants" (GB13223-2011), the dust emission value at the outlet of the electrostatic precipitator under all operating conditions is required to be ≤30mg / Nm 3 , especially in key areas, the dust emission value of the electrostatic precipitator outlet under all working conditions is required to be ≤10mg / Nm 3 , which means that higher requirements are placed on the high-frequency power supply for dust removal. According to the Doitch formula, the dust removal efficiency is proportional to the power supply output voltage, and the stability of the power supply output voltage is closely related to the DC bus voltage. The stability of the filter capacitor performance is directly related to the DC bus voltage, and the stability of the filter capacitor performance is affected by temperature. When the high-frequency power supply is running outdoors, due to the harsh working environment, the temperature rise of the capacitor is also very high when the high-frequency power supply is running at full load. Therefore, in order to ensure the stability of the filter capacitor performance, it is necessary to reduce the temperature rise of the capacitor and improve the heat dissipation environment of the capacitor.

[0003] When the high-frequency power supply works at full frequency and full power for a long time, the temperature of the capacitor is very high, especially in high temperature seasons, the temperature of the capacitor will reach above 80°C. As the temperature of the capacitor rises, the performance and life will drop sharply. Traditional high-frequency power supplies for electrostatic precipitators usually adopt direct air cooling or air-cooled oil cooling, such as the solution shown in the patent with authorization announcement number CN201880601U; the efficiency of the direct air-cooled cooling method is low, and only a small part of the air flow can pass through the area where the filter capacitor is located; and for the cold zone method of air-cooled oil cooling, on the one hand, the equipment cost is high, and on the other hand, the sealing requirements are also very high. In the complex and harsh environment of electrostatic precipitators, the equipment life is short. Therefore, there is a need for a heat dissipation structure for high-frequency power supply filter capacitors for electrostatic precipitators that has a simple structure and can achieve efficient heat dissipation. Summary of the invention

[0004] The utility model aims to solve the deficiencies of the prior art and provide a heat dissipation structure of a high-frequency power supply filter capacitor for an electrostatic precipitator.

[0005] In order to solve the above problems, the utility model adopts the following solutions:

[0006] A heat dissipation structure of a high-frequency power filter capacitor for an electrostatic precipitator comprises a plurality of filter capacitors, a capacitor mounting plate, a housing and a radiator; wherein the radiator comprises a plurality of heat dissipation fins and a heat dissipation base; the heat dissipation fins are regularly arranged on the heat dissipation base, and the heat dissipation fins and the base are vertically arranged; the filter capacitor is fixedly arranged on the capacitor mounting plate, the capacitor mounting plate is arranged on the side of the radiator, and the filter capacitor on the capacitor mounting plate is close to the side of the radiator; the capacitor mounting plate is also fixedly connected to the housing; the housing is fixedly connected to the heat dissipation base of the radiator; the heat dissipation fins and the filter capacitor of the radiator are located on an external high-frequency power supply air duct.

[0007] Furthermore, the capacitor mounting plate includes a bottom plate for connecting to studs of the box; the studs are detachably connected to the box; one end of the filter capacitor is fixedly connected to the bottom plate, and the other end passes through a mounting hole on the box.

[0008] Furthermore, the diameter of the mounting hole is larger than the outer diameter of the cylindrical filter capacitor by a set value.

[0009] Furthermore, it also includes an insulated gate bipolar transistor; the insulated gate bipolar transistor is arranged on the box; the box is also provided with a laminated busbar structure for connecting the insulated gate bipolar transistor and the filter capacitor, and the insulated gate bipolar transistor is connected to the filter capacitor through the laminated busbar structure.

[0010] Furthermore, the heat sink fins and the filter capacitor of the heat sink are located on the external high-frequency power supply air duct.

[0011] Furthermore, the length direction of the heat dissipation fins is consistent with the wind direction in the air duct.

[0012] Furthermore, the radiator also includes a cooling fan; the cooling fan is arranged on the cooling fins.

[0013] Furthermore, the heat dissipation fan is located on a side of the heat dissipation fins away from the heat dissipation base or on side surfaces corresponding to both ends of the heat dissipation fins.

[0014] Furthermore, the filter capacitors are divided into two groups and are respectively arranged on the left and right sides of the radiator.

[0015] Furthermore, the box body includes a box body side panel for protecting components on the box body, the box body side panel is a square plate; the box body side panel is arranged around the edge of the box body; the box body side panel is located on a side of the box body away from the radiator.

[0016] The beneficial effects of the utility model are:

[0017] By setting a box body and a radiator, wherein the radiator includes a radiating fin and a radiating base, and the radiating fin and the filter capacitor of the radiator are both set in the external power supply air duct, the original air flow in the high-frequency power supply is utilized to realize efficient heat dissipation of the components fixed on the radiator and the filter capacitors set on both sides;

[0018] By setting a box side panel around the edge of the box, the components inside are protected from the influence of the wind in the air duct;

[0019] The heat sink includes a heat dissipation fan, so that the heat dissipation fins are actively cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0021] Figure 2 This is a front view of the overall structure of Example 1;

[0022] Figure 3 The explosion view of Example 1 Figure 1 ;

[0023] Figure 4 The explosion view of Example 1 Figure 2 ;

[0024] Description of the symbols in the accompanying drawings: filter capacitor 1, capacitor mounting plate 2, stud 21, bottom plate 22, mounting hole 23, box body 3, radiator 4, cooling fins 41, cooling base 42, insulated gate bipolar transistor 5, box body side plate 6. DETAILED DESCRIPTION

[0025] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the figures only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0027] Embodiment 1:

[0028] like Figures 1 to 4 As shown, a heat dissipation structure of a high-frequency power filter capacitor for electrostatic precipitator includes a plurality of filter capacitors 1, a capacitor mounting plate 2, a box body 3 and a radiator 4; wherein the radiator 4 includes a plurality of heat dissipation fins 41 and a heat dissipation base 42; the heat dissipation fins 41 are regularly arranged on the heat dissipation base 42, and the heat dissipation fins 41 are arranged vertically with the base. In this example, the heat dissipation fins 41 on the heat dissipation base 42 are arranged in parallel and at equal intervals; the filter capacitor 1 is fixedly arranged on the capacitor mounting plate 2, and the capacitor mounting plate 2 is arranged on the side of the radiator 4. The filter capacitor 1 on the capacitor mounting plate 2 is close to the side of the radiator 4, so that the heat dissipated by the filter capacitor 1 can be absorbed by the heat dissipation fins 41, so as to realize efficient heat dissipation of the filter capacitor 1; the capacitor mounting plate 2 is also fixedly connected to the box body 3; the box body 3 is fixedly connected to the heat dissipation base 42 of the radiator 4, so as to realize efficient heat dissipation of the box body 3. In addition, the box body 3 is connected to the capacitor mounting plate 2, so as to take away a certain amount of heat from the capacitor mounting plate 2; it should be noted that in this example, the heat dissipation fins 41 of the radiator 4 and the filter capacitor 1 are both located in the heat dissipation duct of the high-frequency power supply. In this example, a through hole area for setting a heat dissipation base 42 is provided in the middle of the box body 3, and the heat dissipation base 42 of the radiator 4 is provided in the through hole area, and the edge of the heat dissipation base 42 is connected to the edge of the through hole area of ​​the box body 3.

[0029] The capacitor mounting plate 2 includes a base plate 22 and a stud 21 for connecting to the box body 3. In this example, one end of the filter capacitor 1 is fixedly connected to the base plate 22, and the other end passes through a mounting hole 23 on the box body 21. It should be noted that the aperture of the mounting hole 23 is 1 mm larger than the outer diameter of the cylindrical filter capacitor 1; the stud 21 is detachably connected to the box body 3. In this example, an internal thread is provided on the stud 21. One end of the stud 21 is against the corresponding hole position on the box body 3, and combined with a nut, a detachable connection is achieved, which is convenient for disassembly and assembly of the filter capacitor 1.

[0030] It also includes an insulated gate bipolar transistor 5, that is, IGBT; there are two insulated gate bipolar transistors 5, and both of them are arranged on the side of the box body 3 away from the heat dissipation base 42; the box body 3 is also provided with a laminated busbar structure for connecting the insulated gate bipolar transistor 5 and the filter capacitor 1, and the insulated gate bipolar transistor 5 is connected to the filter capacitor 1 through the laminated busbar structure; it should be noted that the laminated busbar structure is an existing structure. It should be noted that the heat dissipation base 42 is provided with a number of holes for connecting components, such as the insulated gate bipolar transistor 5.

[0031] The heat sink fins 41 of the heat sink 4 are located on the air duct of the external high-frequency power supply; the length direction of the heat sink fins 41 is consistent with the wind direction in the air duct, so that the airflow in the air duct of the external high-frequency power supply can quickly pass through the area between the heat sink fins 41, and more gas volume passes between the heat sink fins 41 per unit time, so as to achieve rapid heat dissipation. It should be noted that in some other embodiments, a heat sink fan can also be provided on the heat sink fins 41; the heat sink fan is located on the side of the heat sink fins 41 away from the heat sink base 42 or on the side corresponding to the two ends of the heat sink fins 41, so that the airflow blown by the heat sink fan can quickly pass through the area between the heat sink fins 41.

[0032] The filter capacitor is located on one side of the box 3 where the radiator 4 is provided, so that the filter capacitor can also be located in the air duct together with the radiator, and the filter capacitor is distributed as evenly as possible on both sides of the radiator; in this example, there are 12 filter capacitors 1; the 12 filter capacitors 1 are divided into two groups, which are respectively arranged on the left and right sides of the radiator 4; it should be noted that in some other implementations, the number of filter capacitors 1 can be other values ​​that adapt to the specifications of the equipment, and the filter capacitor 1 can also be arranged only on one side of the box 3.

[0033] The box body 3 includes a box body side panel 6 for protecting the components inside the box body 3, and the box body side panel 6 is a square plate; the box body side panel 6 is arranged around the edge of the box body 3, and in this example, there are four box body side panels 6, and the four box body side panels 6 are respectively placed around the square plate-shaped box body 3; the box body side panel 6 is located on the side of the box body 3 away from the radiator, and surrounds the insulated gate bipolar transistor 5 in the radiator fixedly arranged on the box body 3 on the inner side to protect it.

[0034] During the implementation process, the radiator 4 and the filter capacitor 1 are arranged in the external power supply air duct, wherein the radiator 4 includes cooling fins 41 and a cooling base 42, and the original wind flow in the high-frequency power supply is utilized to achieve efficient heat dissipation of the components and the filter capacitor arranged on the box body 3 and the cooling base 42; and the box body side panel 6 is arranged around the edge of the box body 3 to protect the components inside thereof from being affected by the wind in the air duct.

[0035] The above description is only a specific example of the utility model and does not constitute any limitation to the utility model. Obviously, for professionals in this field, after understanding the content and principle of the utility model, it is possible to make various modifications and changes in form and details without departing from the principle and structure of the utility model, but these modifications and changes based on the idea of ​​the utility model are still within the scope of protection of the claims of the utility model.

Claims

1. A high-frequency power filter capacitor heat dissipation structure for electrostatic precipitator, comprising a plurality of filter capacitors (1), characterized in that: It also comprises a capacitor mounting plate (2), a box (3) and a radiator (4); wherein the radiator (4) comprises a plurality of radiating fins (41) and a radiating base (42); the radiating fins (41) are regularly arranged on the radiating base (42), and the radiating fins (41) and the base are arranged perpendicularly; the filter capacitor (1) is fixedly arranged on the capacitor mounting plate (2), the capacitor mounting plate (2) is arranged on the side of the radiator (4), and the filter capacitor (1) on the capacitor mounting plate (2) is close to the side of the radiator (4); the capacitor mounting plate (2) is also fixedly connected to the box (3); the box (3) is fixedly connected to the radiating base (42) of the radiator (4); the radiating fins (41) and the filter capacitor (1) of the radiator (4) are located on the external high-frequency power supply air duct.

2. A high-frequency power supply filter capacitor heat dissipation structure for electrostatic precipitator according to claim 1, characterized in that: The capacitor mounting plate (2) comprises a bottom plate (22) for connecting a stud (21) to a box (3); the stud (21) is detachably connected to the box (3); one end of the filter capacitor (1) is fixedly connected to the bottom plate (22), and the other end passes through a mounting hole (23) on the box (3).

3. A high-frequency power supply filter capacitor heat dissipation structure for electrostatic precipitator according to claim 2, characterized in that: The diameter of the mounting hole (23) is greater than the outer diameter of the cylindrical filter capacitor (1) by a set value.

4. A high-frequency power supply filter capacitor heat dissipation structure for electrostatic precipitator according to claim 2, characterized in that: It also includes an insulated gate bipolar transistor (5); the insulated gate bipolar transistor (5) is arranged on the box (3); the box (3) is also provided with a laminated busbar structure for connecting the insulated gate bipolar transistor (5) and the filter capacitor (1), and the insulated gate bipolar transistor (5) is connected to the filter capacitor (1) via the laminated busbar structure.

5. The heat dissipation structure of a high-frequency power supply filter capacitor for electrostatic precipitator according to claim 1, characterized in that: The length direction of the heat dissipation fins (41) is consistent with the wind direction in the air duct.

6. A high-frequency power supply filter capacitor heat dissipation structure for electrostatic precipitator according to claim 1, characterized in that: The radiator (4) further comprises a cooling fan; the cooling fan is arranged on the cooling fins (41).

7. A high-frequency power supply filter capacitor heat dissipation structure for electrostatic precipitator according to claim 6, characterized in that: The heat dissipation fan is located on a side of the heat dissipation fin (41) away from the heat dissipation base (42) or on the side surfaces corresponding to the two ends of the heat dissipation fin (41).

8. The heat dissipation structure of a high-frequency power supply filter capacitor for electrostatic precipitator according to claim 1, characterized in that: The filter capacitors (1) are divided into two groups, which are respectively arranged on the left and right sides of the radiator (4).

9. A high-frequency power supply filter capacitor heat dissipation structure for electrostatic precipitator according to any one of claims 1 to 8, characterized in that: The box body (3) comprises a box body side plate (6) for protecting components on the box body (3); the box body side plate (6) is in the shape of a square plate; the box body side plate (6) is arranged around the edge of the box body (3); and the box body side plate (6) is located on a side of the box body (3) away from the radiator.

Images