Frequency converter heat dissipation structure convenient to maintain

Abstract

The invention relates to the technical field of frequency converter heat dissipation, in particular to a frequency converter heat dissipation structure convenient to maintain. The accommodating frame body is used for providing a basic frame for supporting heat dissipation; the heat exchange mechanism is installed in the containing frame and comprises a first heat exchange partition plate and a second heat exchange partition plate. The air cooling mechanism comprises a flow guide sleeve arranged in the containing frame in an embedded mode, a cooling module rotationally arranged on the inner wall of the flow guide sleeve, and a limiting rod connected with the containing frame and located on one side of the flow guide sleeve. According to the invention, the heat dissipation efficiency is significantly improved, the overall heat productivity of the power module is reduced by 60%, and the centralized heat dissipation effect of the IGBT is better; the problem of aging of insulation paste is avoided, faults caused by high temperature are reduced, a complex water cooling system is not needed, the air cooling structure is easy to mount and dismount and firm to mount, the compact frequency converter is suitable for space limitation, and meanwhile maintenance time and cost are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of frequency converter heat dissipation, and in particular to a frequency converter heat dissipation structure convenient to maintain. BACKGROUND

[0002] In the field of wind power generation, the frequency converter is a key device for converting unstable alternating current output by a generator into alternating current with constant frequency. Traditional compact frequency converters usually adopt air cooling and water cooling heat dissipation modes. However, high-speed airflow is difficult to uniformly cover all heat generating elements, especially in compact frequency converters with limited space and many heat dissipation dead angles. The traditional compact frequency converter usually bonds the drive board and IGBT into one body through insulating glue. Long-term high-temperature operation of the IGBT can cause aging of the insulating glue, resulting in short circuit or explosion failure. The fan of part of the air cooling structure is located inside the frequency converter structure, which is inconvenient to disassemble, and brings a lot of burden to the maintenance work of the staff. There is also a security risk of damaging the internal precision components of the frequency converter.

[0003] The heat exchange disc of the water cooling system has high cost and great difficulty in maintenance, which increases the economic burden of operation and maintenance, and is large in size and complex in structure, which is contrary to the concept of compact frequency converter.

[0004] Therefore, there is a need for a frequency converter heat dissipation structure convenient to maintain, which can optimize the heat dissipation structure, separate the power module design, quickly disassemble and maintain the air cooling structure, and reduce the difficulty of operation and maintenance to meet the existing environmental needs. SUMMARY

[0005] This part aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract and title of the specification to avoid obscuring the purpose of this part, the abstract and the title. Such simplifications or omissions cannot be used to limit the scope of the present application.

[0006] In view of the above prior art, the traditional compact frequency converter usually bonds the drive board and IGBT into one body through insulating glue. Long-term high-temperature operation of the IGBT can cause aging of the insulating glue, resulting in short circuit or explosion failure. The fan of part of the air cooling structure is located inside the frequency converter structure, which is inconvenient to disassemble, and brings a lot of burden to the maintenance work of the staff. There is also a security risk of damaging the internal precision components of the frequency converter.

[0007] Therefore, the technical problem to be solved by the present application is to design a frequency converter heat dissipation structure convenient to maintain, which can optimize the heat dissipation structure, separate the power module design, quickly disassemble and maintain the air cooling structure, and reduce the difficulty of operation and maintenance to meet the existing environmental needs.

[0008] To solve the above technical problems, the present application provides the following technical scheme: a frequency converter heat dissipation structure convenient to maintain, comprising,

[0009] The accommodating frame provides a support frame for heat dissipation;

[0010] The heat exchange mechanism is installed in the accommodating frame and comprises a first heat exchange partition plate and a second heat exchange partition plate;

[0011] The air cooling mechanism comprises a flow guide sleeve embedded in the accommodating frame, a cooling module rotatably arranged on the inner wall of the flow guide sleeve, and a limiting rod connected to the accommodating frame and located on one side of the flow guide sleeve.

[0012] As an improvement of the present application,

[0013] The power assembly is arranged in the accommodating frame;

[0014] The power assembly comprises an IGBT module group and a driving board module group;

[0015] The IGBT module group and the driving board module group are arranged separately, and a heat conduction air duct is left between the IGBT module group and the driving board module group.

[0016] As an improvement of the present application,

[0017] The first heat exchange partition plate is close to the reactor in the accommodating frame, and the second heat exchange partition plate is close to the IGBT module group;

[0018] The second heat exchange partition plate fixes the IGBT module group.

[0019] As an improvement of the present application,

[0020] A flow guide cavity is fixedly arranged on one side of the accommodating frame, and a guide slot is fixedly arranged on the inner wall of the flow guide cavity;

[0021] An adjusting ring groove is fixedly arranged at the end of the guide slot.

[0022] As an improvement of the present application,

[0023] An adjusting hole is fixedly arranged on one side of the flow guide cavity;

[0024] The adjusting hole is connected to the adjusting ring groove.

[0025] As an improvement of the present application,

[0026] A flow guide block and a limiting block are fixedly arranged on the outer wall of the flow guide sleeve;

[0027] The flow guide block is made of conductive material, one side of the limiting block is fixedly provided with a positioning hole, and the diameter of the positioning hole matches that of the limiting rod.

[0028] As an improvement of the present application,

[0029] The inner wall of the flow guide sleeve is provided with a protection plate located on one side of the cooling module.

[0030] The end of the limiting rod is located on one side of the protection plate.

[0031] As an improvement of the present application,

[0032] One end of the limiting rod is fixedly provided with an elastic member, which is elastically connected with the containing frame body.

[0033] The end of the limiting rod is provided with an arc surface.

[0034] As an improvement of the present application,

[0035] One end of the flow guide sleeve is fixedly provided with a finger groove.

[0036] The beneficial effects of the present application are: the heat dissipation efficiency is significantly improved, the overall heat dissipation of the power module is reduced by 60%, the concentrated heat dissipation effect of IGBT is better; the aging problem of insulating glue is avoided, the failure caused by high temperature is reduced, the complex water cooling system is not needed, the air cooling structure is simple to install and disassemble and firm to install, suitable for the space limitation of compact frequency converters, and the maintenance time and cost are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings. Among them:

[0038] Fig. 1 It is a three-dimensional schematic view of the frequency converter heat dissipation structure convenient to maintain in the present application.

[0039] Fig. 2 It is a detailed perspective view of the frequency converter heat dissipation structure convenient to maintain in the present application.

[0040] Fig. 3 It is an internal plane architecture diagram of the frequency converter heat dissipation structure convenient to maintain in the present application.

[0041] Fig. 4 It is a local structure schematic view of the frequency converter heat dissipation structure convenient to maintain in the present application.

[0042] Fig. 5 It is another angle structure schematic view of the frequency converter heat dissipation structure convenient to maintain in the present application.

[0043] Fig. 6The schematic diagram of the flow guide sleeve structure of the variable frequency device heat dissipation structure convenient to maintain in the application.

[0044] Fig. 7 The schematic diagram of the flow guide sleeve and the limiting rod plane layout of the variable frequency device heat dissipation structure convenient to maintain in the application. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0046] Embodiment 1

[0047] Reference Figs. 1-3 The embodiment provides a variable frequency device heat dissipation structure convenient to maintain.

[0048] The embodiment optimizes the heat dissipation layout and the air cooling design, significantly improves the heat dissipation efficiency, and enhances the environmental adaptability and reliability. The containing frame 1 is made of a metal material with high strength and high thermal conductivity and serves as a basic support frame of the entire heat dissipation structure. The containing frame 1 is essentially a main part of the variable frequency device. A corrosion-resistant and wear-resistant coating (such as polytetrafluoroethylene) is coated on the surface of the containing frame 1, so that the corrosion resistance and wear resistance can be improved.

[0049] The heat exchange mechanism 2 is installed inside the containing frame 1. The heat exchange mechanism 2 includes a first heat exchange partition plate 21 and a second heat exchange partition plate 22, forms a sandwich structure, and is used for enhancing the heat exchange efficiency. The first heat exchange partition plate 21 is installed close to the reactor side and is used for enhancing the heat exchange efficiency between the heat dissipation fin group and the internal air of the variable frequency device. The second heat exchange partition plate 22 is installed close to the IGBT side, is used for fixing the IGBT module, simultaneously increases the heat dissipation area, and improves the heat conduction efficiency. A cavity is formed between the two partition plates. Cold air enters from the bottom, flows through the IGBT and the reactor, and is discharged from the top, so that high-efficiency convection heat dissipation is realized.

[0050] The air cooling mechanism 3 is used for further enhancing the heat dissipation effect on the basis of natural heat dissipation. The air cooling mechanism 3 actually includes a fan group. Three flow guide sleeves 31 are linearly arranged and embedded in the containing frame 1 in the scheme. Other arrangement modes can also be selected. The flow guide sleeve 31 plays a role in fixing the corresponding air cooling mechanism 3 frame.

[0051] The inner wall of the flow guide sleeve 31 is rotationally provided with a cooling module 32. The main structure of the cooling module 32 is a fan and a matching accessory structure. After the flow guide sleeve 31 is inserted into the containing frame 1 and fixed, the corresponding cooling module 32 is also in a starting state. A technician can start the cooling module 32 by remote control or through a manual switch, so that the entire air cooling mechanism 3 starts to work.

[0052] On one side of the flow guide sleeve 31, a limiting rod 33 is arranged, the limiting rod 33 is elastically connected with the containing frame 1, and the extension section of the limiting rod 33 can be just above the flow guide sleeve 31, which can block and limit the flow guide sleeve 31, preventing the entire containing frame 1 from being overturned and the flow guide sleeve 31 from slipping off in an accidental situation.

[0053] Embodiment 2

[0054] With reference to Figs. 1-5 The embodiment is based on the previous embodiment, and is different from the previous embodiment in that the containing frame 1 is internally provided with a power assembly 11, the power assembly 11 adopts a modular design, and an IGBT module group 111 is centrally installed on the mounting surface of the second heat exchange partition plate 22 and can be tightly attached to the partition plate through heat-conducting silica gel.

[0055] The power assembly 11 includes the IGBT module group 111 and a driving board module group 112, and the IGBT module group 111 and the driving board module group 112 are separately arranged and installed through corresponding supporting brackets, and a heat-conducting air duct is left between the IGBT module group 111 and the driving board module group 112.

[0056] The first heat exchange partition plate 21 is installed close to the reactor side in the containing frame 1, for enhancing the heat exchange efficiency between the fin group and the internal air of the frequency converter, and the second heat exchange partition plate 22 is installed close to the IGBT module group 111, for fixing the IGBT module group 111 and increasing the corresponding heat dissipation area and improving the heat conduction efficiency, and the heat-conducting air duct formed between the first heat exchange partition plate 21 and the second heat exchange partition plate 22 ensures that the cold air enters from the bottom, flows through the IGBT module group 111, and is discharged from the top, realizing efficient convection heat dissipation.

[0057] The second heat exchange partition plate 22 can be selected to be heat-conducting silica gel or other combined modes to ensure stable connection with the IGBT module group 111.

[0058] Three flow guide cavities 13 are fixedly arranged on one side of the containing frame, the number of the flow guide cavities 13 corresponds to the number of the flow guide sleeves 31, and each flow guide cavity 13 is used for containing a flow guide sleeve 31. Two guide notches 131 are fixedly arranged on the inner wall of the flow guide cavity 13, the guide notches 131 extend towards the bottom of the flow guide cavity 13, and an adjusting ring groove 1311 is fixedly arranged at the end of the guide notches 131.

[0059] The outer wall of the flow guide sleeve 31 is fixedly provided with a flow guide block 311 and a limiting block 312, the sizes of the flow guide block 311 and the limiting block 312 correspond to the size of the guide notch 131, and during the insertion of the flow guide sleeve 31 into the flow guide cavity 13, the flow guide block 311 and the limiting block 312 can enter the guide notch 131 through matching, and then pass through the guide notch 131 to enter the adjusting ring groove 1311.

[0060] The adjusting ring groove 1311 is arranged to enable the flow guide sleeve 31 to rotate adaptively after entering, the flow guide block 311 is arranged as a sliding block made of a material capable of conducting current, and after entering the adjusting ring groove 1311 and rotating along the adjusting ring groove 1311, the flow guide block 311 can finally contact a flow guide element arranged in the adjusting ring groove 1311, thereby connecting the operation loop of the cooling module 32.

[0061] The limiting block 312 has the same size as the flow guide block 311, and in this scheme, the limiting block 312 is symmetrically arranged with the flow guide block 311, and when the flow guide block 311 rotates to the corresponding position along with the flow guide sleeve 31, the limiting block 312 also rotates to the opposite symmetrical position in the adjusting ring groove 1311.

[0062] One side of the flow guide cavity 13 is fixedly provided with an adjusting hole 132, the adjusting hole 132 penetrates the containing frame 1 and extends to the adjusting ring groove 131, and is connected with the adjusting ring groove 131. A positioning hole 3121 is fixedly arranged on one side of the limiting block 312, and the diameter of the positioning hole 3121 matches the limiting rod 33.

[0063] When the limiting block 312 rotates to the specified position, the limiting block 312 contacts the bottom of the limiting rod 33 and pushes the limiting rod 33 up through the contact, so that the operation route of the limiting block 312 is not blocked. When the positioning hole 3121 is located below the limiting rod 33, the limiting rod 33 can fall into the positioning hole 3121, and under the clamping cooperation of the limiting rod 33 and the positioning hole 3121, the flow guide sleeve 31 can be prevented from loosening after rotating to the position.

[0064] Embodiment 3

[0065] Reference Figs. 1-7 This embodiment is based on the previous embodiment, and is different from the previous embodiment in that:

[0066] A protection plate 31 is arranged on the inner wall of the flow guide sleeve 31, the protection plate 31 does not need to have additional mechanical cooperation with the flow guide sleeve 31, and the structure is as simple as possible, the diameter of the protection plate 31 matches the inner wall of the flow guide sleeve 31, and in the default state, the protection plate 31 and the inner wall of the flow guide sleeve 31 can be fixed by friction force when the flow guide sleeve 31 is not working.

[0067] One end of the limiting rod 33 is fixedly provided with an elastic member 331, and the elastic member 331 is elastically connected with the outer wall of the containing frame body 1. When the flow guide sleeve 31 needs to start working, the limiting rod 33 is appropriately rotated first. The angle of the limiting rod 33 itself is beneficial to rotation, and it is not necessary to rotate a large angle. The elastic member 331 is selected as a tension spring in the scheme. Since the tension spring itself has a certain degree of rotation ductility, after the limiting rod 33 is rotated, it can be rotated back to the original position under the action of the elastic member 331.

[0068] After the limiting rod 33 is rotated, the end of the limiting rod 33 will deviate from the original position of the protection plate 313 and the flow guide sleeve 31, so that the flow guide sleeve 31 can be inserted and rotated. At this time, the limiting rod 33 is loosened, the flow guide sleeve 31 is rotated, the end of the limiting rod 33 is provided as an arc surface, the limiting block 312 will contact the bottom of the limiting rod 33 in the rotation process of the flow guide sleeve 31, and push the limiting rod 33 up through the contact.

[0069] After the positioning hole 3121 starts to be located below the limiting rod 33, the limiting rod 33 can fall into the positioning hole 3121. Under the clamping cooperation of the limiting rod 33 and the positioning hole 3121, it can be ensured that the flow guide sleeve 31 will not be loosened after being rotated in place.

[0070] The outward side of the flow guide sleeve 31 is fixedly provided with a finger groove 314, which is convenient for the staff to directly control the rotation of the flow guide sleeve 31, and can also ensure the safety and stability of the operation process. When the flow guide sleeve 31 needs to be disassembled, the limiting rod 33 is only pulled to ensure that the end of the limiting rod 33 is separated from the positioning hole 3121, and then the original process is reversed to remove the flow guide sleeve 31 for cleaning and maintenance work.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A variable frequency drive heat dissipation structure convenient to maintain, characterized in that: a containing frame (1) is provided to support the basic frame of heat dissipation; a heat exchange mechanism (2) is installed in the containing frame (1) and comprises a first heat exchange partition (21) and a second heat exchange partition (22); and a forced air cooling mechanism (3) comprises a flow guide sleeve (31) embedded in the containing frame (1), a cooling module (32) rotatably arranged on the inner wall of the flow guide sleeve (31), and a limiting rod (33) connected to the containing frame (1) and located on one side of the flow guide sleeve (31).

2. The variable frequency drive heat dissipation structure convenient to maintain according to claim 1, characterized in that: a power assembly (11) is arranged in the containing frame (1); the power assembly (11) comprises an IGBT module group (111) and a driving board module group (112); and the IGBT module group (111) and the driving board module group (112) are arranged separately, and a heat conduction air duct is left between the IGBT module group (111) and the driving board module group (112).

3. The variable frequency drive heat dissipation structure convenient to maintain according to claim 2, characterized in that: the first heat exchange partition (21) is close to a reactor in the containing frame (1), and the second heat exchange partition (22) is close to the IGBT module group (111); and the second heat exchange partition (22) fixes the IGBT module group (111).

4. The variable frequency drive heat dissipation structure convenient to maintain according to claim 1, characterized in that: a flow guide cavity (13) is fixedly arranged on one side of the containing frame (1), and a guide slot (131) is fixedly arranged on the inner wall of the flow guide cavity (13); an adjusting ring groove (1311) is fixedly arranged at the end of the guide slot (131), and a flow guide element is arranged in the adjusting ring groove (1311).

5. The variable frequency drive heat dissipation structure convenient to maintain according to claim 4, characterized in that: an adjusting hole (132) is fixedly arranged on one side of the flow guide cavity (13); and the adjusting hole (132) is connected to the adjusting ring groove (1311).

6. The variable frequency drive heat dissipation structure convenient to maintain according to any one of claims 1 to 5, characterized in that: a flow guide block (311) and a limiting block (312) are fixedly arranged on the outer wall of the flow guide sleeve (31); the flow guide block (311) is made of conductive material, a limiting hole (3121) is fixedly arranged on one side of the limiting block (312), and the diameter of the limiting hole (3121) matches that of the limiting rod (33).

7. The variable frequency drive heat dissipation structure convenient to maintain according to claim 6, characterized in that: a protection plate (313) is arranged on the inner wall of the flow guide sleeve (31), and the protection plate (313) is located on one side of the cooling module (32); and the end of the limiting rod (33) is located on one side of the protection plate (313).

8. The variable frequency drive heat dissipation structure convenient to maintain according to claim 7, characterized in that: an elastic element (331) is fixedly arranged on one end of the limiting rod (33), and the elastic element (331) is elastically connected to the containing frame (1). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The limiting rod (33) is provided with an arc surface at the end.

9. The maintenance-friendly heat dissipation structure of a frequency converter according to claim 8, characterized in that: The flow guide sleeve (31) is fixedly provided with a finger groove (314) at one end.

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