Shield plate grounding structure and frequency converter

Abstract

The utility model discloses a shielding plate grounding structure and a frequency converter, and relates to the technical field of frequency converters, the shielding plate grounding structure comprises at least one conductive connecting piece, and a shielding plate, a driving plate, a power module and a radiator which are stacked in sequence; and one end of the conductive connecting piece supports and is connected with the shielding plate, and the other end of the conductive connecting piece penetrates through the driving plate, is fixed with the power module and is locked on the radiator. The utility model aims to simplify the overall structure of the frequency converter, reduce the manufacturing cost and the maintenance cost, and improve the space utilization efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to frequency converter technical field especially relates to a shielding plate ground structure and frequency converter. BACKGROUND

[0002] The conventional layout of the existing frequency drive solution is usually a bottom-up structure, in which the heat sink is located at the bottom layer to absorb the heat generated by the modules during operation. The modules, such as power integrated circuits (PIMs), insulated gate bipolar transistors (IGBTs), etc., are fixed on the heat sink by screws. Then, the drive board is installed on the casing and is welded or plugged with the pins of the modules, while above the modules, a shielding sheet metal structure is installed as needed to provide electromagnetic shielding, and above the shielding sheet metal structure, a filter board structure is installed to further reduce electromagnetic interference.

[0003] However, since the shielding plate needs to be connected to the heat sink to achieve grounding (PE), a space or slot needs to be reserved on the drive board for the shielding plate to pass through, and usually additional sheet metal parts are needed to make the connection, which not only requires enough space to accommodate all components, limits the design flexibility of the drive board, increases the cost, but also affects its electrical performance and overall electromagnetic compatibility. These problems collectively result in the inconvenience of installation and maintenance of the frequency drive solution, as well as the reduction of space utilization efficiency. SUMMARY

[0004] The main purpose of the utility model is to provide a shielding plate grounding structure, which aims to simplify the overall structure of the frequency converter, reduce the production and maintenance costs, and improve the space utilization efficiency.

[0005] To achieve the above-mentioned purpose, the utility model provides a shielding plate grounding structure, which comprises:

[0006] a shielding plate, a drive board, a power module, and a heat sink arranged in layers; and

[0007] at least one conductive connecting piece, one end of the conductive connecting piece is supported and connected to the shielding plate, the other end of the conductive connecting piece passes through the drive board and is fixed with the power module, and is locked to the heat sink.

[0008] In an embodiment, the conductive connecting piece comprises a support section and a locking section connected to the support section, and an external thread is provided on the end of the locking section away from the support section;

[0009] the drive board is provided with a first through hole for the support section to pass through, and the support section is clamped between the shielding plate and the power module;

[0010] The power module is provided with a second through hole for the locking section to pass through, and the heat sink is provided with a locking groove for the locking section to lock, and the circumferential wall of the locking groove is provided with an internal thread for cooperating and connecting with the external thread of the locking section.

[0011] In an embodiment, the outer diameter of the supporting section is greater than the outer diameter of the locking section.

[0012] The shielding plate grounding structure further comprises a gasket, which is sleeved on one end of the locking section close to the supporting section and located between the end surface of the supporting section and the outer side wall of the power module.

[0013] In an embodiment, the shielding plate grounding structure further comprises a spring sheet, which is sleeved on one end of the locking section close to the supporting section and located between the gasket and the end surface of the supporting section.

[0014] In an embodiment, the end of the supporting section away from the locking section is provided with a tapped groove;

[0015] The conductive connecting piece further comprises a locking piece, the shielding plate is provided with a third through hole for the locking piece to pass through, and the locking piece is locked in the tapped groove.

[0016] In an embodiment, the circumferential surface of the external thread of the locking section is covered with thread glue.

[0017] In an embodiment, the supporting section is a hexagonal stud.

[0018] In an embodiment, the shielding plate grounding structure further comprises a filter plate, which is arranged on the side of the shielding plate away from the driving plate.

[0019] In an embodiment, the shielding plate grounding structure comprises a plurality of conductive connecting pieces.

[0020] The shielding plate grounding structure directly connects the shielding plate, the driving plate, the power module and the heat sink into one body through the conductive connecting piece, realizes the PE pull-through of the heat sink to the shielding plate, and the conductive connecting piece can also support and connect the shielding plate and the driving plate, and fix the power module and the locking heat sink, so that the connection of the shielding plate grounding structure is more firm, and the future maintenance and replacement are also facilitated. Since the driving plate does not need to be slotted or reserved for the grounding of the heat sink, and no additional adapter sheet metal part is needed, the overall structure is simplified, the design flexibility of the driving plate is improved, the components can be more compactly arranged, the manufacturing cost and maintenance cost are reduced, the direct and effective grounding connection also helps to improve the electromagnetic shielding effect, thereby improving the overall electromagnetic compatibility, and improving the electrical performance of the driving plate. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0022] Figure 1 The structural schematic diagram of an embodiment of the shielding plate grounding structure provided by the present application is shown in the figure.

[0023] Figure 2 The structural schematic diagram of another embodiment of the shielding plate grounding structure provided by the present application is shown in the figure.

[0024] Figure 3 The Figure 1 The half-sectional view of the shielding plate grounding structure provided by the present application is shown in the figure.

[0025] Figure 4 The structural schematic diagram of the conductive connecting piece provided by the present application is shown in the figure.

[0026] Explanation of the reference numerals:

[0027] 100, shielding plate grounding structure; 1, conductive connecting piece; 11, support section; 12, locking section; 13, tapping groove; 2, shielding plate; 3, driving plate; 4, power module; 5, heat sink; 6, gasket; 7, spring piece; 8, filter plate.

[0028] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] It should be noted that if the present application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0031] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the same or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not in the protection scope required by the utility model.

[0032] The utility model provides a shielding plate ground structure 100.

[0033] Please refer to Figures 1 to 4 In an embodiment of the utility model, the shielding plate ground structure 100 can include at least one electrically conductive connecting piece 1 and shielding plate 2, drive plate 3, power module 4 and radiator 5 are sequentially stacked;One end of the electrically conductive connecting piece 1 supports and connects the shielding plate 2, the other end of the electrically conductive connecting piece passes through the drive plate 3 and is fixed with the power module 4, and is locked in the radiator 5.

[0034] In this embodiment, taking vertical installation as an example, the radiator 5 is usually located at the bottom layer, mainly providing the basis for heat dissipation of the upper components, and the radiator 5 can be directly fixed on the shell or internal frame of the equipment;And the power module 4 is arranged on the top of the radiator 5, so that the high-efficiency heat dissipation performance of the radiator 5 can be utilized;The drive plate 3 is located above the power module 4, and the drive plate 3 is usually responsible for controlling the operation of the power module, and can be connected with the power module by welding or plug-in mode;The shielding plate 2 is located at the top layer, and is used for shielding electromagnetic interference, and the shielding plate 2 can be directly covered on the drive plate 3, or isolated from the drive plate 3 by an insulating gasket to prevent short circuit.

[0035] The shielding plate grounding structure 100 proposed in the embodiment directly connects the shielding plate 2, the driving plate 3, the power module 4 and the heat sink 5 together through the conductive connecting piece 1, realizes the PE pull-through of the heat sink 5 to the shielding plate 2, and the conductive connecting piece 1 can also support the connection of the shielding plate 2 and the driving plate 3, fix the power module 4 and lock the heat sink 5, so that the connection of the shielding plate grounding structure 100 is more firm, and it is also convenient for future maintenance and replacement. Since there is no need to open a slot or reserve space on the driving plate 3 for the grounding of the heat sink 5, and no additional adapter sheet metal part is needed, not only the overall structure is simplified, the design flexibility of the driving plate 3 is improved, the components can be arranged more compactly, the manufacturing cost and maintenance cost are reduced, but also the direct and effective grounding connection helps to improve the electromagnetic shielding effect, thereby improving the overall electromagnetic compatibility and improving the electrical performance of the driving plate 3.

[0036] It should be noted that the "conductive connecting piece 1" is a conductive connecting component, and its main function is to reliably connect the heat sink 5, the power module 4, the driving plate 3 and the shielding plate 2 together and form a complete grounding loop, which can be realized by various structures, such as: combined structure, metal bolts or screws, metal columns or pins with locking structure, composite structure of screws and studs. The locking of the conductive connecting piece 1 and the heat sink 5 can be achieved by threaded connection, welding or conductive adhesive, and it should be noted that when using conductive adhesive, it is necessary to ensure sufficient bonding strength and conductivity.

[0037] In an embodiment, the conductive connecting piece 1 can include a support section 11 and a locking section 12 connected to the support section 11, and the locking section 12 is provided with external threads at an end away from the support section 11. The driving plate 3 is provided with a first through hole for the support section 11 to pass through, and the support section 11 is clamped between the shielding plate 2 and the power module 4. In this way, the support section 11 can support the driving plate 3 and the shielding plate 2 to provide a firm mechanical connection, which helps to maintain the structural stability of the entire variable frequency drive system, can prevent relative displacement caused by vibration or other external forces, and when the support section 11 is also made of a heat-conducting material such as metal, it can also serve as a heat conduction path to help transfer heat from the driving plate 3 to the heat sink 5, which helps to improve the heat dissipation efficiency of the entire system.

[0038] Further, the power module 4 is provided with a second through hole for the locking section 12 to pass through, and the heat sink 5 is provided with a threaded groove for the locking section 12 to lock, and the circumferential wall of the threaded groove is provided with an internal thread matched with the external thread of the locking section 12. Through the cooperation of the external thread and the internal thread, the locking section 12 can be firmly connected to the power module 4 and the heat sink 5, which ensures the stability of the electrically conductive connection and avoids loosening or breaking of the connection due to vibration or impact, thereby improving the reliability of the system, and the threaded connection simplifies the installation process, eliminating the need for complex welding or other connection methods, which is convenient and fast and facilitates disassembly and replacement during maintenance.

[0039] In the embodiment, the external thread can be provided on the entire outer side of the locking section 12, or only on the position of the end portion away from the supporting section 11. In this way, the locking force and the flexibility of the connection can be adjusted according to actual needs, ensuring firm threaded connection at specific positions, while avoiding affecting the insertion or removal of the electrically conductive connection 1 near the supporting section 11 due to the presence of the thread. In addition, this partial threaded design can also reduce the difficulty of thread processing and reduce manufacturing costs, while maintaining the stability and reliability of the connection.

[0040] It should be noted that in the above embodiment, the inner wall of the third through hole can also be provided with an internal thread matched with the external thread of the locking section 12. Through threaded connection, the power module and the locking section 12 can be tightly fixed together, ensuring that they do not move relative to each other during operation.

[0041] In an embodiment, the outer diameter of the supporting section 11 can be greater than the outer diameter of the locking section 12, so that the supporting section 11 has a larger cross-sectional area, thereby improving its bending and compression resistance. This allows the supporting section 11 to function as a vertical limiting element to prevent the power device from moving. In addition, the supporting section 11 arranged between the power module 4 and the shielding plate 2 can also function as a support to maintain a stable distance between the power module 4 and the drive plate 3, ensuring the reliability of the electrical connection. Such a design not only improves the overall mechanical strength of the structure, but also to some extent absorbs and disperses the stress caused by temperature changes, reducing the impact of thermal expansion on electronic components. At the same time, the large outer diameter design of the supporting section 11 can also provide a better heat conduction path between the drive plate 3 and the shielding plate 2. By increasing the heat conduction area, it helps to quickly and effectively transfer heat from the drive plate 3 to the heat sink 5, thereby improving the heat dissipation efficiency of the entire system, reducing the working temperature of the power module 4, and prolonging the service life of the electronic equipment.

[0042] Further, the shielding plate grounding structure 100 can further comprise a gasket 6, which is sleeved on the end of the locking segment 12 close to the supporting segment 11 and is located between the end surface of the supporting segment 11 and the outer side wall of the power module 4. Since the gasket 6 is usually made of a material with certain hardness and elasticity, when the locking segment 12 is tightened, the gasket 6 will be compressed, thereby generating additional friction force between the supporting segment 11 and the outer side wall of the power module 4. This friction force helps to resist loosening caused by vibration or temperature change, and the gasket 6 can fill the gap caused by uneven surface or gap to ensure good electrical contact and reduce contact resistance, thereby improving grounding effect, preventing electromagnetic interference and static accumulation.

[0043] To further improve the connection stability of the locking segment 12 and the heat sink 5, in an embodiment, the shielding plate grounding structure 100 can further comprise a spring 7, which is sleeved on the end of the locking segment 12 close to the supporting segment 11 and is located between the gasket 6 and the end surface of the supporting segment 11. The spring 7 is made of a material with high elasticity. When the locking segment 12 is tightened, the spring 7 will be elastically deformed to store elastic energy, thereby continuously applying a continuous pre-pressure to the locking segment 12. This pressure helps to maintain the fastening state of the locking segment 12 and prevent loosening caused by vibration or temperature change. In addition, in a vibrating environment, the elastic properties of the spring 7 can absorb and disperse vibration energy, reduce the impact of vibration on the fastener, and improve the dynamic stability of the connection.

[0044] Of course, when the internal space of the device is very compact and cannot accommodate the spring 7 or the gasket 6, or when the device does not vibrate much, the spring 7 and the gasket 6 can also not be provided.

[0045] To improve the flexibility of the connection, in an embodiment, the end of the supporting segment 11 away from the locking segment 12 is provided with a tapped hole groove 13, and the conductive connecting piece further comprises a locking member, and the shielding plate is provided with a third through hole for the locking member to pass through, and the locking member is locked in the tapped hole groove. The tapped hole groove 13 refers to a groove with internal threads machined at one end, so that a bolt, screw or other locking member with external threads can be directly screwed in. Since the locking member can adjust the fastening force, this structure can better adapt to shielding plates and other components of different thicknesses, making the design more versatile. In this way, the compactness and integration of the structure are improved, the number of parts needed is reduced, and the assembly and disassembly of the components are facilitated, especially in space-limited or difficult-to-access situations.

[0046] To improve the connection stability of the locking section 12 and the radiator 5, in an embodiment, the peripheral surface of the external thread of the locking section 12 is covered with thread glue. Thread glue is a viscous compound that can fill the gaps between threads and prevent the locking section 12 from loosening under vibration or impact after curing. It should be noted that the use of thread glue is flexible, and it can be set with or without the spring 7 and the gasket 6, depending on the application requirements and conditions, and the present embodiment is not limited.

[0047] To facilitate the installation of the conductive connector 1, in an embodiment, the support section 11 is a hexagonal stud. The head and middle part of the hexagonal stud are usually hexagonal, which can facilitate the use of a hexagonal sleeve (also known as a wrench or adjustable wrench) to rotate the entire conductive connector 1, making it easier for the external thread of the locking section 12 to be screwed into the locking groove of the radiator 5.

[0048] In an embodiment, the shielding plate grounding structure 100 can also include a filter plate 8 disposed on the side of the shielding plate 2 facing away from the driving plate 3. The main function of the filter plate 8 is to suppress electromagnetic interference, which can help reduce the impact of electromagnetic waves generated by the driving plate 3 on surrounding electronic equipment, while also preventing external electromagnetic interference from affecting the normal operation of the driving plate 3. The filter plate 8, in combination with the shielding plate 2, can form a more effective electromagnetic shielding layer to protect sensitive electronic components on the driving plate 3.

[0049] In an embodiment, the shielding plate grounding structure 100 includes multiple conductive connectors 1. Multiple conductive connectors 1 can provide more paths for current to flow effectively from the driving plate 3 to the ground, thereby reducing the grounding resistance, and through multi-point grounding, the common mode interference on the driving plate 3 can be reduced, improving the system's resistance to electromagnetic interference. In addition, multiple conductive connectors 1 can also provide more secure support to prevent the driving plate 3 from deforming or bending, thereby ensuring the normal operation and life of the circuit components. It should be noted that multiple conductive connectors 1 can be scattered in various corners of the driving plate 3 or concentrated in a relatively small area, as long as they can achieve more reliable connection and support.

[0050] The utility model discloses still a kind of frequency converter, the frequency converter includes shielding plate grounding structure 100, the specific structure of the shielding plate grounding structure 100 refers to above-mentioned embodiment, since the frequency converter has adopted all technical solutions of above-mentioned embodiment, therefore at least has all beneficial effects brought by the technical solutions of above-mentioned embodiment, here not to repeat, of course, it can be understood that above-mentioned shielding plate grounding structure 100 can also be applied to other industrial equipment, for example: driver etc., specifically, it can be determined according to actual situation, this specification embodiment does not limit this.

[0051] The above merely illustrates the exemplary embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, made by using the present application specification and drawings, are included in the patent protection scope of the present application.

Claims

1. A shield plate grounding structure characterized by comprising: The shielding plate grounding structure comprises: a shielding plate, a driving plate, a power module and a heat sink arranged in layers; and at least one electrically-conductive connecting piece, one end of the electrically-conductive connecting piece being supported and connected to the shielding plate, the other end of the electrically-conductive connecting piece passing through the driving plate and being fixed to the power module and locked to the heat sink.

2. The shield plate grounding structure according to claim 1, wherein The electrically-conductive connecting piece comprises a supporting section and a locking section connected to the supporting section, and an outer thread is arranged on the end of the locking section away from the supporting section; the driving plate is provided with a first through hole for the supporting section to pass through, and the supporting section is clamped between the shielding plate and the power module; the power module is provided with a second through hole for the locking section to pass through, and the heat sink is provided with a locking groove for the locking section to be locked, and an inner thread is arranged on the circumferential wall of the locking groove to match and connect with the outer thread of the locking section.

3. The shield plate grounding structure according to claim 2, wherein The outer diameter of the supporting section is greater than the outer diameter of the locking section; The shielding plate grounding structure further comprises a gasket, which is sleeved on the end of the locking section close to the supporting section and located between the end face of the supporting section and the outer side wall of the power module.

4. The shield plate grounding structure according to Claim 3, wherein The shielding plate grounding structure further comprises a spring sheet, which is sleeved on the end of the locking section close to the supporting section and located between the gasket and the end face of the supporting section.

5. The shield plate grounding structure according to Claim 2, wherein The end of the supporting section away from the locking section is provided with a tapped hole groove; The electrically-conductive connecting piece further comprises a locking piece, and the shielding plate is provided with a third through hole for the locking piece to pass through, and the locking piece is locked in the tapped hole groove.

6. The shield plate grounding structure according to Claim 2, wherein The circumferential surface of the outer thread of the locking section is covered with thread glue.

7. The shield plate grounding structure according to Claim 2, wherein The supporting section is a hexagonal stud.

8. The shield plate grounding structure according to any one of claims 1 to 7, wherein The shielding plate grounding structure further comprises a filter plate, which is arranged on the side of the shielding plate away from the driving plate.

9. The shield plate grounding structure according to any one of claims 1 to 7, wherein The shielding plate grounding structure comprises a plurality of the electrically-conductive connecting pieces.

10. A frequency converter, characterized in that The shielding plate grounding structure comprises a shielding plate, a driving plate, a power module and a heat sink arranged in layers. The shielding plate grounding structure comprises a shielding plate, a driving plate, a power module and a heat sink arranged in layers.

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