Frequency converter and air compressor

Abstract

The utility model provides a frequency converter and an air compressor, the frequency converter comprises a shell, the shell is internally provided with a first heat exchange space and a second heat exchange space, the first heat exchange space is internally provided with at least one first heating part, the second heat exchange space is internally provided with at least one second heating part, and the first heat exchange space and the second heat exchange space are communicated with each other. The total heating power of the first heating component is smaller than that of the second heating component, a first fan set with at least one fan is arranged in the first heat exchange space, and a second fan set with at least one fan is arranged in the second heat exchange space. And the total air flow of the first fan group is smaller than the total air flow of the second fan group. According to the frequency converter heat dissipation structure, graded heat dissipation with targeted design can be formed, so that the heat dissipation effect can be provided while sufficient heat dissipation performance is ensured for heat exchange spaces with different heating powers, the energy consumption is reduced, and the energy efficiency of the frequency converter heat dissipation structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to a frequency converter and an air compressor. Background Art

[0002] Air compressors are essential power-generating devices used across various industrial sectors. The use of frequency converters in air compressor systems enables them to precisely coordinate electrical and frequency conversion control to instantly control output power, maintain stable system pressure, and achieve on-demand output.

[0003] Since the frequency converter of the air compressor in the prior art has technical problems such as poor heat dissipation effect and high energy consumption, the utility model studies and designs a frequency converter and an air compressor. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the inverter of the air compressor in the prior art, such as poor heat dissipation effect and high energy consumption, thereby providing an inverter and an air compressor.

[0005] In order to solve the above problems, the present invention provides a frequency converter, which includes:

[0006] A shell having a first heat exchange space and a second heat exchange space therein, at least one first heat-generating component being arranged in the first heat exchange space, at least one second heat-generating component being arranged in the second heat exchange space, the total heat-generating power of the first heat-generating component being less than the total heat-generating power of the second heat-generating component, a first fan group having at least one fan being arranged in the first heat exchange space, a second fan group having at least one fan being arranged in the second heat exchange space, and the total airflow rate of the first fan group being less than the total airflow rate of the second fan group.

[0007] In some embodiments,

[0008] The total number of fans in the first fan group is smaller than the total number of fans in the second fan group, and the average speed of the fans in the first fan group is smaller than the average speed of the fans in the second fan group.

[0009] In some embodiments,

[0010] An upper-layer component of the inverter and a lower-layer component of the inverter are arranged in the shell, the upper-layer component of the inverter is located at the upper end of the lower-layer component of the inverter, and the upper-layer component of the inverter and the lower-layer component of the inverter are separated by a sheet metal part; the upper-layer component of the inverter, the lower-layer component of the inverter and the sheet metal part are an integrated structure, the upper-layer component of the inverter includes the first heat exchange space and the first heat-generating component, the upper part of the sheet metal part and the shell form the first heat exchange space, the lower-layer component of the inverter includes the second heat exchange space and the second heat-generating component, and the lower part of the sheet metal part and the shell form the second heat exchange space.

[0011] In some embodiments,

[0012] The upper components of the inverter include a weak current area and a strong current area, and the sheet metal parts include a terminal board support sheet metal group and a main control board support sheet metal; the weak current area is provided with a terminal board, an indicator light, the terminal board support sheet metal group and an intermediate relay, and the strong current area is provided with a main control board, a switching power supply, the main control board support sheet metal, and a module support sheet metal. The first heating component includes the terminal board, the indicator light, the intermediate relay, the main control board and the switching power supply; the first fan group includes a first cooling fan.

[0013] In some embodiments,

[0014] The lower components of the inverter include a radiator, an inverter module and a rectifier module. The second heat-generating component includes the inverter module and the rectifier module. The second fan group includes a second cooling fan. The radiator includes two, the first radiator is opposite to or attached to the inverter module to exchange heat for the inverter module, and the second radiator is opposite to or attached to the rectifier module to cool and dissipate heat for the rectifier module.

[0015] In some embodiments,

[0016] The lower layer components of the inverter also include an incoming copper sheet assembly, a capacitor module, a support frame, an outgoing copper sheet assembly, a cement resistor and a fan mounting sheet metal, and the second heating component also includes the incoming copper sheet assembly, the capacitor module, the outgoing copper sheet assembly and the cement resistor.

[0017] In some embodiments,

[0018] The terminal block support sheet metal group is provided with a rivet nut, which is connected to the shell by screws. The terminal block and the intermediate relay are fixed to the terminal block support sheet metal group by guide rails, and the indicator light is fixed to the corresponding reserved hole position; the lower end of the module support sheet metal is fixed to the radiator by screws, one side of the module support sheet metal is fixed to the switching power supply by a guide rail, and the other side is bent to fix the main control board support sheet metal. The main control board is installed on the main control board support sheet metal by bolts, pillar caps and pillar seats, and is flipped by a hinge.

[0019] In some embodiments,

[0020] The inverter module and the rectifier module are fixed to the radiator by bolts. The radiator is fixed to the inside of the shell by the module support sheet metal, the support frame and the connecting sheet metal, and at the same time isolates the air duct at the bottom of the inverter and the upper and lower components of the inverter. One end of the incoming copper sheet assembly is fixed to the rectifier module by bolt connection, a corresponding hole is opened in the middle, and it is connected and fixed to the terminal board support sheet metal group through an insulating column. The outgoing copper sheet assembly is fixed to the inverter module by bolt connection, a corresponding hole is opened in the middle, and it is connected and fixed to the connecting sheet metal through an insulating column; the capacitor module is connected to the support frame by a mounting plate, the mounting plate is fixed to the bottom of the capacitor module, and the support frame is connected to the capacitor module by screws; the cement resistor is fixed on the sheet metal strip and connected and fixed to the shell by a rivet nut; the fan mounting sheet metal is fixed to the shell by a rivet nut, and the second cooling fan is connected to the fan mounting sheet metal by a rivet nut.

[0021] In some embodiments,

[0022] The inverter inlet and outlet wiring ports include a busbar, an import current sensor, an outlet current sensor, an insulating column, a grounding copper sheet and a connecting sheet metal; the busbar is fixed to the capacitor module by bolts, and the pins are connected to the inverter module by screws. The import current sensor and the outlet current sensor are respectively fixed to the corresponding hole positions in the middle section of the incoming copper sheet assembly and the outgoing copper sheet assembly by bolts. The insulating columns are respectively connected to the terminal board support sheet metal group and the connecting sheet metal by bolts to fix the position of the copper sheet; the grounding copper sheet is respectively fixed to the terminal board support sheet metal group and the radiator by bolts, and is arranged corresponding to the hole positions on the inlet and outlet cover plate.

[0023] In some embodiments,

[0024] The components on the lower side of the main control board include a switching power board, a power board support sheet metal, a high-voltage sampling board, a discharge resistor board and a contactor assembly. The power board support sheet metal is installed on the main control board support sheet metal. The switching power board is installed on the power board support sheet metal through bolts, support caps and support seats. The high-voltage sampling board and the discharge resistor board are placed up and down and are fixed to the mounting sheet metal respectively through bolts, support caps and support seats; the contactor assembly is installed on one side of the radiator through bolts, and is connected to the rectifier module and busbar respectively through copper sheets.

[0025] The utility model also provides an air compressor, which includes the aforementioned frequency converter.

[0026] The utility model provides a frequency converter and an air compressor with the following beneficial effects:

[0027] 1. The utility model is configured to have a first and a second heat exchange space inside the housing of the inverter, a first heat exchange space is provided with a first heat-generating component, and a second heat exchange space is provided with a second heat exchange component, and the total power of the first heat-generating component is less than the total power of the second heat-generating component, and the first fan group provided in the first heat exchange space is configured to have a total airflow flow rate smaller than that of the second fan group in the second heat exchange space, so that fans with different airflow rates can be provided according to the different heating powers of components in different spaces, thereby forming a targeted designed graded heat dissipation, thereby ensuring sufficient heat dissipation performance for heat exchange spaces with different heating powers, and also providing a heat dissipation effect, reducing energy consumption, and improving the energy efficiency of the heat dissipation structure of the inverter.

[0028] 2. The utility model also uses sheet metal to separate the components inside the inverter box in layers, reducing mutual interference between modules, especially arranging components with larger mass at the bottom to ensure structural stability, and separating strong and weak electricity on the left and right sides to ensure electrical safety; the modular design of the device of the utility model ensures the quick installation and disassembly of the inverter components, saving the labor cost of disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a side view of the internal structure of the frequency converter of the present utility model;

[0030] Figure 2 This is a schematic diagram of the upper structure of the frequency converter of the utility model;

[0031] Figure 3 This is a schematic diagram of the lower structure of the frequency converter of the utility model;

[0032] Figure 4 This is a schematic diagram of the lower component structure of the main control board of the frequency converter of the present utility model;

[0033] Figure 5This is a structural diagram of the input and output wiring ports of the frequency converter of the present utility model;

[0034] Figure 6 It is a schematic diagram of the overall appearance structure of the frequency converter of the present utility model.

[0035] The reference numerals indicate:

[0036] 100, first heat exchange space; 200, second heat exchange space; 1, inverter upper assembly; 2, inverter lower assembly; 3, main control board; 4, switching power supply; 5, terminal block; 6, wire duct; 7, indicator light; 8, terminal block support sheet metal assembly; 9, main control board support sheet metal; 10, module support sheet metal; 11, intermediate relay; 12, incoming copper sheet assembly; 13, inverter module; 14, radiator; 15, capacitor module; 16, support frame; 17, outgoing copper sheet assembly; 18, rectifier module; 19, water Mud resistor; 201, first cooling fan; 202, second cooling fan; 21, fan mounting sheet metal; 22, switching power supply board; 23, power supply board support sheet metal; 24, high-voltage sampling board; 25, discharge resistor board; 26, contactor assembly; 27, busbar; 28, import current sensor; 29, export current sensor; 30, insulating column; 31, grounding copper sheet; 32, connecting sheet metal; 33, cover; 34, terminal block cover; 35, inlet and outlet cover; 36, shell; 37, fan guard. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0040] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0042] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0043] like Figure 1-6 As shown, the utility model provides a frequency converter, which includes:

[0044] The shell 36 has a first heat exchange space 100 and a second heat exchange space 200 inside. At least one first heat-generating component is provided in the first heat exchange space 100, and at least one second heat-generating component is provided in the second heat exchange space 200. The total heating power of the first heat-generating component is less than the total heating power of the second heat-generating component. A first fan group having at least one fan is provided in the first heat exchange space 100, and a second fan group having at least one fan is provided in the second heat exchange space 200, and the total airflow rate of the first fan group is less than the total airflow rate of the second fan group.

[0045] The utility model arranges the interior of the inverter housing to have a first and a second heat exchange space, a first heat-generating component is arranged in the first heat exchange space, and a second heat-generating component is arranged in the second heat exchange space, and the total power of the first heat-generating component is less than the total power of the second heat-generating component, and the first fan group arranged in the first heat exchange space is arranged to have a total airflow flow rate smaller than that of the second fan group in the second heat exchange space, so that fans with different airflow rates can be arranged according to the different heating powers of components in different spaces, thereby forming a targeted designed graded heat dissipation. The integrated inverter case of the utility model performs graded heat dissipation according to the difference in required heat dissipation, thereby ensuring sufficient heat dissipation performance for heat exchange spaces with different heating powers, while also providing a heat dissipation effect, reducing energy consumption, and improving the energy efficiency of the inverter heat dissipation structure.

[0046] In some embodiments,

[0047] The total number of fans in the first fan group is smaller than the total number of fans in the second fan group, and the average speed of the fans in the first fan group is smaller than the average speed of the fans in the second fan group.

[0048] This is a preferred structural form of the utility model in which the total airflow rate of the first fan group is smaller than the total airflow rate of the second fan group. By setting the total number of fans in the first fan group to be greater than the total number of fans in the second fan group, the airflow rate can be differentiated by differentiating the number of fans, so that more fans are arranged in the heat exchange space with high power and fewer fans are arranged in the heat exchange space with low power; and / or the average fan speed of the first fan group is smaller than the average fan speed of the second fan group. The airflow rate can be differentiated by differentiating the speed setting, so that fans with higher average speed are arranged in the heat exchange space with high power and fans with lower average speed are arranged in the heat exchange space with low power.

[0049] In some embodiments,

[0050] The inverter upper component 1 and the inverter lower component 2 are arranged in the shell 36, and the inverter upper component 1 is located at the upper end of the inverter lower component 2, and the inverter upper component 1 and the inverter lower component 2 are separated by a sheet metal part; the inverter upper component 1, the inverter lower component 2 and the sheet metal part are an integrated structure, the inverter upper component 1 includes the first heat exchange space 100 and the first heat-generating component, and the upper part of the sheet metal part and the shell 36 form the first heat exchange space 100, the inverter lower component 2 includes the second heat exchange space 200 and the second heat-generating component, and the lower part of the sheet metal part and the shell 36 form the second heat exchange space 200.

[0051] The present invention also uses sheet metal to separate the components inside the inverter box into layers, reducing mutual interference between modules, especially arranging components with larger mass at the bottom to ensure structural stability, and separating strong electricity and weak electricity on the left and right sides at the top to ensure electrical safety; the modular design of the device of the present invention ensures the quick installation and disassembly of the inverter components, saving the labor cost of disassembly and assembly.

[0052] This utility model proposes a dedicated inverter housing structure for air compressors. This allows the inverter to perfectly implement control functions on complete machines with special installation space and electrical connection restrictions, while ensuring convenient installation and high space utilization. Compared to general-purpose inverters, the dedicated inverter in this housing structure is more closely connected to other modules of the complete machine, eliminating the need for special structural modifications to the complete machine to accommodate the inverter. The structural design better meets the needs of the complete machine and offers significant structural advantages. At the same time, the arrangement of components within the housing fully utilizes space, eliminating redundant designs and ensuring perfect control functions. The specialized design also makes the inverter more compatible with the complete machine and simplifies control.

[0053] In some embodiments,

[0054] The upper component 1 of the inverter includes a weak current area and a strong current area, and the sheet metal includes a terminal board support sheet metal group 8 and a main control board support sheet metal 9; the weak current area is provided with a terminal board 5, an indicator light 7, the terminal board support sheet metal group 8 and an intermediate relay 11, and the strong current area is provided with a main control board 3, a switching power supply 4, the main control board support sheet metal 9, and a module support sheet metal 10. The first heating component includes the terminal board 5, the indicator light 7, the intermediate relay 11, the main control board 3 and the switching power supply 4; the first fan group includes a first cooling fan 201.

[0055] The inverter of the present invention has an integrated structure, with internal stratification achieved by sheet metal parts, and an integral chassis on the outside. The heat dissipation design is carried out according to the difference in thermal power between the upper and lower layers, and the heat dissipation system is controlled as a whole. The present invention uses sheet metal to separate the components inside the inverter case in layers, with larger components arranged at the bottom to ensure structural stability, and strong and weak electricity separated on the left and right sides at the top to ensure electrical safety. The hierarchical heat dissipation design is used, and cooling fans with different flow rates are set according to the different heat dissipation requirements of the upper and lower layers to improve the heat dissipation effect. The modular design of the device ensures the quick installation and disassembly of the inverter components, saving the labor cost of disassembly and assembly.

[0056] The lower layer of this utility model primarily houses the power module, while the upper layer houses the control module. The power module generates significant heat during operation, requiring greater heat dissipation from the lower layer. Cooling fans with different flow rates refer to the amount of air passing through them per unit time, a parameter affected by fan speed and size. The lower layer requires greater heat dissipation, and to maintain the internal temperature of the chassis, the fan's cooling power must be higher.

[0057] See also Figure 1 The inverter's internal components are divided into the upper inverter assembly 1 and the lower inverter assembly 2. The upper inverter assembly 1 is divided into two parts: the front, which is the weak current area and consists of the terminal block 5, indicator light 7, terminal block support sheet metal assembly 8, and intermediate relay 11; the back, which is the strong current area, consists of the main control board 3, switching power supply 4, main control board support sheet metal 9, and module support sheet metal 10. The lower inverter assembly 2 is the layer where bulky components are placed and the power module is mounted. Two heat sinks 14 are placed in the front and back to dissipate heat from the inverter module 13 and rectifier module 18, respectively.

[0058] In some embodiments,

[0059] The lower component 2 of the inverter includes a radiator 14, an inverter module 13 and a rectifier module 18. The second heat-generating component includes the inverter module 13 and the rectifier module 18. The second fan group includes a second cooling fan 202. The radiator 14 includes two, of which the first radiator is opposite to or in contact with the inverter module 13 to exchange heat for the inverter module 13, and the second radiator is opposite to or in contact with the rectifier module 18 to cool and dissipate heat for the rectifier module 18.

[0060] The present invention provides a magnetic levitation inverter housing (casing) for air compressors. The internal components include an upper inverter assembly 1 and a lower inverter assembly 2. The lower inverter assembly 2 is located within the housing 36, close to the bottom of the housing 36. The upper inverter assembly 1 is located above the lower inverter assembly 2, separated by a terminal block support sheet metal assembly 8 and a main control board support sheet metal assembly 9. The housing 36 is equipped with inlet and outlet cover plates 35 and a fan guard 37 at the front and rear, and a cover plate 33 and a terminal block cover 34 above. The overall dimensions of the inverter are 840 mm in length, 500 mm in width, and 370 mm in height.

[0061] See also Figure 3 The lower-layer components 2 of the inverter include an incoming copper sheet assembly 12, an inverter module 13, a radiator 14, a capacitor module 15, a support frame 16, an outgoing copper sheet assembly 17, a rectifier module 18, a cement resistor 19, a second cooling fan 202, and a fan mounting sheet metal 21. The inverter module 13 and the rectifier module 18 are fixed to the radiator 14 by bolts. The radiator 14 is fixed to the inside of the housing 36 by the module support sheet metal 10, the support frame 16, and the connecting sheet metal 32. At the same time, it isolates the inverter bottom air duct and the inverter upper-layer components 1 and the inverter lower-layer components 2, making it convenient for the inverter to perform hierarchical heat dissipation and improving heat dissipation efficiency. One end of the incoming copper sheet assembly 12 is fixed to the rectifier module 18 by bolts, and a corresponding hole is opened in the middle. The insulating column 30 is used to connect and fix it with the terminal board support sheet metal group 8 by bolts to ensure its stability. The outgoing copper sheet assembly 17 is fixed to the inverter module 13 by bolt connection, and a corresponding hole is opened in the middle. It is fixed by bolt connection with the connecting sheet metal 32 using the insulating column 30. The capacitor module 15 is connected to the support frame 16 through a mounting plate through the bolts provided by the capacitor. The mounting plate is fixed to the bottom of the capacitor module 15. At the same time, holes are opened around it. The support frame 16 is designed with rivet nuts at the corresponding holes, and the capacitor module 15 and the support frame 16 are connected by screws. The cement resistor 19 is fixed on the sheet metal strip and connected and fixed to the housing 36 by rivet nuts. The fan mounting sheet metal 21 is fixed to the housing 36 by rivet nuts, and the second cooling fan 202 is connected by rivet nuts designed at the corresponding positions on the fan mounting sheet metal 21.

[0062] In some embodiments,

[0063] The inverter lower component 2 also includes an incoming copper sheet assembly 12, a capacitor module 15, a support frame 16, an outgoing copper sheet assembly 17, a cement resistor 19 and a fan mounting sheet metal 21, and the second heating component also includes the incoming copper sheet assembly 12, the capacitor module 15, the outgoing copper sheet assembly 17 and the cement resistor 19.

[0064] In some embodiments,

[0065] The terminal block support sheet metal group 8 is provided with a rivet nut, which is connected to the housing 36 by screws. The terminal block 5 and the intermediate relay 11 are fixed to the terminal block support sheet metal group 8 by guide rails, and the indicator light 7 is fixed to the corresponding reserved hole position; the lower end of the module support sheet metal 10 is fixed to the radiator 14 by screws, one side of the module support sheet metal 10 is fixed to the switching power supply 4 by a guide rail, and the other side is bent to fix the main control board support sheet metal 9, and the main control board 3 is installed on the main control board support sheet metal 9 by bolts, pillar caps and pillar seats, and is flipped by a hinge.

[0066] See also Figure 2 The upper component 1 of the inverter is divided into two parts, front and back. The front end is the weak current area. The terminal board support sheet metal group 8 is provided with a rivet nut and is connected to the shell 36 by screws. The terminal board 5 and the intermediate relay 11 are fixed to the terminal board support sheet metal group 8 through guide rails, and the indicator light 7 is fixed to the reserved corresponding hole position; the rear end is the strong current area. The lower end of the module support sheet metal 10 is fixed to the radiator 14 by screws, and the switching power supply 4 is fixed on the left side by a guide rail. The right side is bent and designed to fix the main control board support sheet metal 9. The main control board 3 is installed on the main control board support sheet metal 9 by bolts, pillar caps, and pillar seats, and the hinge is used to realize the flipping of the hinge.

[0067] In some embodiments,

[0068] The inverter module 13 and the rectifier module 18 are fixed to the radiator 14 by bolts. The radiator 14 is fixed to the inside of the housing 36 by the module support sheet metal 10, the support frame 16 and the connecting sheet metal 32, while isolating the air duct at the bottom of the inverter and the upper component 1 and the lower component 2 of the inverter. One end of the incoming copper sheet assembly 12 is fixed to the rectifier module 18 by bolts, a corresponding hole is opened in the middle, and it is connected and fixed to the terminal board support sheet metal group 8 by an insulating column 30. The outgoing copper sheet assembly 17 is fixed by bolts. On the inverter module 13, a corresponding hole is opened in the middle, and is connected and fixed to the connecting sheet metal 32 through an insulating column 30; the capacitor module 15 is connected to the support frame 16 through a mounting plate, and the mounting plate is fixed to the bottom of the capacitor module 15, and the support frame 16 is connected to the capacitor module 15 through screws; the cement resistor 19 is fixed on the sheet metal strip and connected and fixed to the shell 36 through a rivet nut; the fan mounting sheet metal 21 is fixed to the shell 36 through a rivet nut, and the second cooling fan 202 is connected to the fan mounting sheet metal 21 through a rivet nut.

[0069] In some embodiments,

[0070] The inverter input and output wiring ports include a busbar 27, an import current sensor 28, an export current sensor 29, an insulating column 30, a grounding copper sheet 31 and a connecting sheet metal 32; the busbar 27 is fixed to the capacitor module 15 by bolts, and the pins are connected to the inverter module 13 by screws. The import current sensor 28 and the export current sensor 29 are respectively fixed to the corresponding holes in the middle section of the incoming copper sheet assembly 12 and the outgoing copper sheet assembly 17 by bolts. The insulating column 30 is respectively connected to the terminal board support sheet metal group 8 and the connecting sheet metal 32 by bolts to fix the position of the copper sheet; the grounding copper sheet 31 is respectively fixed to the terminal board support sheet metal group 8 and the radiator 14 by bolts, and is arranged corresponding to the hole positions on the inlet and outlet cover plate 35.

[0071] In some embodiments,

[0072] The components on the lower side of the main control board include a switching power board 22, a power board support sheet metal 23, a high-voltage sampling board 24, a discharge resistor board 25 and a contactor assembly 26. The power board support sheet metal 23 is installed on the main control board support sheet metal 9, and the switching power board 22 is installed on the power board support sheet metal 23 by bolts, support caps and support seats. The high-voltage sampling board 24 and the discharge resistor board 25 are placed up and down and are fixed to the mounting sheet metal by bolts, support caps and support seats respectively; the contactor assembly 26 is installed on one side of the radiator 14 by bolts, and is connected to the rectifier module 18 and the busbar 27 respectively through copper sheets.

[0073] See also Figure 4 The components on the lower side of the main control board include the switching power board 22, the power board support sheet metal 23, the high-voltage sampling board 24, the discharge resistor board 25, and the contactor assembly 26. The power board support sheet metal 23 is mounted on the main control board support sheet metal 9. The switching power board 22 is mounted on the power board support sheet metal 23 via bolts, support caps, and support bases. The high-voltage sampling board 24 and the discharge resistor board 25 are placed one above the other and fixed to the mounting sheet metal via bolts, support caps, and support bases. The contactor assembly 26 is mounted on the right side of the radiator 14 via bolts and is connected to the rectifier module 18 and busbar 27 via copper sheets.

[0074] See also Figure 5The inverter's inlet and outlet wiring ports include a busbar 27, an inlet current sensor 28, an outlet current sensor 29, an insulating column 30, a grounding copper sheet 31, and a connecting sheet metal 32. The busbar 27 is bolted to the capacitor module 15, and its pins are connected to the inverter module 13 via screws. The inlet current sensor 28 and the outlet current sensor 29 are bolted to the corresponding holes in the middle sections of the inlet copper sheet assembly 12 and the outlet copper sheet assembly 17, respectively. The insulating column 30 is bolted to the terminal board support sheet metal group 8 and the connecting sheet metal 32, respectively, to fix the copper sheet positions. The grounding copper sheet 31 is bolted to the terminal board support sheet metal group 8 and the radiator 14, respectively, and corresponds to the holes on the inlet and outlet cover 35, facilitating wiring.

[0075] The utility model also provides an air compressor, which includes the aforementioned frequency converter.

[0076] This utility model utilizes a dedicated air-cooled inverter structure for air compressors, meeting the overall installation size constraints and functional requirements. Its specialized design enhances overall system stability and improves operating efficiency. The inverter's modular component design improves installation convenience; tiered heat dissipation improves efficiency and enhances cooling effectiveness; and a partitioned layout separates high-voltage and low-voltage power, ensuring electrical safety and reducing mutual interference between modules.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. Such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A frequency converter, characterized in that: include: A shell (36) is provided with a first heat exchange space (100) and a second heat exchange space (200) inside the shell (36), at least one first heat-generating component is provided in the first heat exchange space (100), at least one second heat-generating component is provided in the second heat exchange space (200), the total heat-generating power of the first heat-generating component is less than the total heat-generating power of the second heat-generating component, a first fan group having at least one fan is provided in the first heat exchange space (100), a second fan group having at least one fan is provided in the second heat exchange space (200), and the total airflow rate of the first fan group is less than the total airflow rate of the second fan group.

2. The frequency converter according to claim 1, characterized in that: The total number of fans in the first fan group is smaller than the total number of fans in the second fan group, and the average speed of the fans in the first fan group is smaller than the average speed of the fans in the second fan group.

3. The frequency converter according to claim 1, wherein: The housing (36) is provided with an upper-layer component (1) of the frequency converter and a lower-layer component (2) of the frequency converter. The upper-layer component (1) of the frequency converter is located at the upper end of the lower-layer component (2) of the frequency converter. The upper-layer component (1) of the frequency converter and the lower-layer component (2) of the frequency converter are separated from each other by a sheet metal part. The upper-layer component (1), the lower-layer component (2) of the frequency converter and the sheet metal part are an integrated structure. The upper-layer component (1) of the frequency converter includes the first heat exchange space (100) and the first heat-generating component. The upper part of the sheet metal part and the housing (36) enclose the first heat exchange space (100). The lower-layer component (2) of the frequency converter includes the second heat exchange space (200) and the second heat-generating component. The lower part of the sheet metal part and the housing (36) enclose the second heat exchange space (200).

4. The frequency converter according to claim 3, characterized in that: The inverter upper layer component (1) includes a weak current area and a strong current area, and the sheet metal parts include a wiring board supporting sheet metal group (8) and a main control board supporting sheet metal (9); the weak current area is provided with a wiring board (5), an indicator light (7), the wiring board supporting sheet metal group (8) and an intermediate relay (11); the strong current area is provided with a main control board (3), a switching power supply (4), the main control board supporting sheet metal (9), and a module supporting sheet metal (10); the first heating component includes the wiring board (5), the indicator light (7), the intermediate relay (11), the main control board (3) and the switching power supply (4); and the first fan group includes a first cooling fan (201).

5. The frequency converter according to claim 4, characterized in that: The inverter lower component (2) includes a heat sink (14), an inverter module (13) and a rectifier module (18); the second heat-generating component includes the inverter module (13) and the rectifier module (18); the second fan group includes a second cooling fan (202); the heat sink (14) includes two, wherein the first heat sink is opposite to or attached to the inverter module (13) to exchange heat with the inverter module (13); and the second heat sink is opposite to or attached to the rectifier module (18) to cool and dissipate heat from the rectifier module (18).

6. The frequency converter according to claim 5, characterized in that: The inverter lower layer assembly (2) further comprises an incoming copper sheet assembly (12), a capacitor module (15), a support frame (16), an outgoing copper sheet assembly (17), a cement resistor (19) and a fan mounting sheet metal (21); the second heating component further comprises the incoming copper sheet assembly (12), the capacitor module (15), the outgoing copper sheet assembly (17) and the cement resistor (19).

7. The frequency converter according to claim 5, characterized in that: The terminal board support sheet metal group (8) is provided with a pressure rivet nut, which is connected to the housing (36) by screws. The terminal board (5) and the intermediate relay (11) are fixed to the terminal board support sheet metal group (8) by guide rails, and the indicator light (7) is fixed to the reserved corresponding hole position; the lower end of the module support sheet metal (10) is fixed to the radiator (14) by screws, one side of the module support sheet metal (10) fixes the switching power supply (4) by a guide rail, and the other side is bent to fix the main control board support sheet metal (9), and the main control board (3) is installed on the main control board support sheet metal (9) by bolts, support caps and support seats, and is flipped by a hinge.

8. The frequency converter according to claim 6, characterized in that: The inverter module (13) and the rectifier module (18) are fixedly mounted on the radiator (14) by means of bolts. The radiator (14) is fixed inside the housing (36) by means of the module support sheet metal (10), the support frame (16) and the connection sheet metal (32), while isolating the air duct at the bottom of the inverter and the inverter upper component (1) and the inverter lower component (2). One end of the incoming copper sheet assembly (12) is fixed to the rectifier module (18) by means of bolts, a corresponding hole is provided in the middle, and the copper sheet assembly (12) is connected and fixed to the terminal board support sheet metal assembly (8) by means of an insulating column (30). The outgoing copper sheet assembly (17) is fixed by means of bolts. The inverter module (13) is fixed with a corresponding hole in the middle, and is connected and fixed with the connecting sheet metal (32) through an insulating column (30); the capacitor module (15) is connected with the support frame (16) through a mounting plate, the mounting plate is fixed to the bottom of the capacitor module (15), and the support frame (16) is connected with the capacitor module (15) through screws; the cement resistor (19) is fixed on the sheet metal bar and connected and fixed with the housing (36) through a pressure rivet nut; the fan mounting sheet metal (21) is fixed to the housing (36) through a pressure rivet nut, and the second cooling fan (202) is connected with the fan mounting sheet metal (21) through a pressure rivet nut.

9. The frequency converter according to claim 6, characterized in that: The frequency converter inlet and outlet wiring port comprises a busbar (27), an inlet current sensor (28), an outlet current sensor (29), an insulating column (30), a grounding copper sheet (31) and a connecting sheet metal (32); the busbar (27) is fixed to the capacitor module (15) by bolts, and the pins are connected to the inverter module (13) by screws; the inlet current sensor (28) and the outlet current sensor (29) are respectively fixed to the corresponding hole positions of the middle sections of the inlet copper sheet assembly (12) and the outlet copper sheet assembly (17) by bolts; the insulating column (30) is respectively connected to the terminal board support sheet metal group (8) and the connecting sheet metal (32) by bolts, and is used to fix the position of the copper sheets; the grounding copper sheet (31) is respectively fixed to the terminal board support sheet metal group (8) and the radiator (14) by bolts, and is arranged corresponding to the hole positions on the inlet and outlet cover plate (35).

10. The frequency converter according to claim 9, characterized in that: The components on the lower side of the main control board include a switching power supply board (22), a power supply board support sheet metal (23), a strong current sampling board (24), a discharge resistor board (25) and a contactor assembly (26), wherein the power supply board support sheet metal (23) is mounted on the main control board support sheet metal (9), the switching power supply board (22) is mounted on the power supply board support sheet metal (23) by means of bolts, a support cap and a support seat, the strong current sampling board (24) and the discharge resistor board (25) are placed up and down and fixed to the mounting sheet metal by means of bolts, a support cap and a support seat respectively; the contactor assembly (26) is mounted on one side of the radiator (14) by means of bolts and is connected to the rectifier module (18) and the busbar (27) by means of copper sheets.

11. An air compressor, characterized in that: The invention comprises the frequency converter according to any one of claims 1 to 10.

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