CN212811572U

CN212811572U - Inverter is with sealed and electromagnetic shield structure

Info

Publication number: CN212811572U
Application number: CN202021535598.1U
Authority: CN
Inventors: 杨守银; 朱雷; 王旭峰; 吴四军
Original assignee: Shanghai Yikong Power System Co ltd
Current assignee: Shanghai Yikong Power System Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-03-26
Anticipated expiration: 2030-07-29

Abstract

A sealing and electromagnetic shielding structure for an inverter comprises an inverter, a motor, a sealing ring and conductive foam; a sealing ring and conductive foam are arranged between the three-phase mounting surface of the inverter shell and the three-phase mounting surface of the motor shell, and the conductive foam is contacted with and conducted with the three-phase mounting surface of the inverter shell and the three-phase mounting surface of the motor shell, so that the inverter shell and the three-phase mounting surface of the motor shell are in clearance fit; the inverter shell and the motor shell are connected through bolts, and bolt connection joint surfaces on the three-phase mounting surfaces are attached without gaps. The utility model greatly reduces the requirement of high dimensional tolerance of parts for controlling the inverter shell and the motor shell, effectively reduces the cost of the parts and improves the yield of the parts; the inverter shell and the motor shell are mounted on the three-phase mounting surface without contact through the conductive foam, the mounting difficulty is reduced, the electromagnetic radiation effect of the three-phase line to the low-voltage sensor can be completely blocked through the conductive foam conduction, and the EMC performance of the inverter is improved.

Description

Inverter is with sealed and electromagnetic shield structure

Technical Field

The utility model relates to an electricity drives technical field, in particular to inverter is with sealed and electromagnetic shield structure.

Background

After the inverter and the motor of the electric vehicle are assembled, the high-voltage safety of the whole vehicle needs to be met, so that the inverter and the motor need to meet IP67 after being assembled, and the connection of the assembly part of the shell needs to be designed in a sealing manner. Referring to fig. 1 to 4, in order to ensure the contact between the inverter housing and the three-phase mounting surface of the motor housing, the sealing design of the assembly of the conventional inverter and motor is end face sealing, which is shown as a part a in fig. 4, the design is to ensure that the bolt connection joint surfaces on the three-phase mounting surfaces of the inverter housing and the motor housing are in small clearance fit, and the assembly is to be in tight contact by bolts, which is shown as a part b in fig. 4.

The design has a plurality of problems, firstly, the bolt connection combination surface on the three-phase mounting surface of the inverter shell and the motor shell is ensured to be in small clearance fit, the size of a part is highly required, the processing difficulty of the part is increased, and the cost of the part is increased; secondly, the inverter shell and the motor shell are deformed and then contacted by screwing the bolt, so that the requirement on the installation process of parts is high, if the control is not proper, the connection is failed, and the high-voltage safety cannot be ensured; furthermore, large plane contact between the inverter shell and the three-phase mounting surface of the motor shell is difficult to guarantee, and if local tilting occurs, the low-voltage sensor is directly exposed to the interference of three-phase high voltage, and the EMC performance of the whole machine is seriously affected.

SUMMERY OF THE UTILITY MODEL

To the above problems, the present invention provides a sealing and electromagnetic shielding structure for inverter.

The purpose of the utility model can be realized by the following technical scheme: a sealing and electromagnetic shielding structure for an inverter comprises an inverter, a motor, a sealing ring and conductive foam; the inverter comprises an inverter shell, the motor comprises a motor shell, a sealing ring and conductive foam are arranged between the inverter shell and a three-phase mounting surface of the motor shell, the conductive foam is positioned on the inner side of the sealing ring and arranged on the periphery of a three-phase copper bar of the inverter, the conductive foam is in contact with and conducts the three-phase mounting surface of the inverter shell and the three-phase mounting surface of the motor shell, and the inverter shell and the three-phase mounting surface of the motor shell are in clearance fit; the inverter shell is connected with the motor shell through bolts, and bolt connection joint surfaces on three-phase mounting surfaces of the inverter shell and the motor shell are attached without gaps.

Furthermore, a sealing ring mounting groove and a conductive foam mounting groove are formed in the three-phase mounting surface of the inverter shell.

Still further, the sealing washer mounting groove sets up along the edge of the three-phase installation area on the three-phase installation face of inverter housing, the dc-to-ac converter is including installing the three-phase copper bar on the inverter housing, be equipped with the long slotted hole of the three-phase copper bar that corresponds the dc-to-ac converter on the motor casing, the cotton mounting groove of electrically conductive bubble is located the inboard of sealing washer mounting groove and sets up in the three-phase copper bar week side of dc.

Further, the inverter 1 further includes a low-voltage connector installed on the inverter housing, and the inverter housing and the motor housing are respectively provided with an installation hole and an insertion hole corresponding to the low-voltage connector.

Furthermore, the conductive foam comprises foam and a conductive layer wrapped outside the foam.

Compared with the prior art, the beneficial effects of the utility model are that: the sealing function between the three-phase mounting surfaces of the inverter shell and the motor shell can be realized by adjusting the diameter of the sealing ring, the sealing effect is ensured, the requirement for controlling the high dimensional tolerance of parts of the inverter shell and the motor shell is greatly reduced, the part cost is effectively reduced, and the finished product rate of the parts is improved; the cotton thickness of electrically conductive bubble design allowance is great, can not need the contact between the three-phase installation face of inverter housing and motor casing like this, has reduced the installation degree of difficulty, need not reach the purpose of contact through the deformation of part, and the cotton three-phase installation face that makes inverter housing and motor casing of electrically conductive bubble switches on mutually in addition, can block the electromagnetic radiation effect of three-phase line to low-voltage sensor completely, has promoted inverter EMC performance.

Drawings

Fig. 1 is a schematic view of an assembly of a related art inverter and motor.

Fig. 2 is an exploded view of a prior art inverter and motor.

Fig. 3 is a bottom view of a prior art inverter and motor.

Fig. 4 is a sectional view a-a of fig. 3, showing an assembly gap of the inverter housing and the motor housing.

Fig. 5 is an assembly diagram of the inverter and the motor according to the present invention.

Fig. 6 is an exploded view of the inverter and the motor according to the present invention.

Fig. 7 is a bottom view of the inverter and the motor according to the present invention.

Fig. 8 is a sectional view of B-B in fig. 7.

Fig. 9 is a schematic structural diagram of the conductive foam of the present invention.

Fig. 10 is a cross-sectional view of C-C in fig. 9.

The parts in the figures are numbered as follows:

1 inverter

101 inverter case

1011 mounting hole

102 three-phase copper bar

103 low-voltage connector

2 electric machine

201 motor casing

2011 Jack

2012 long slotted hole

3 sealing ring

4 conductive foam

401 foam

402 a conductive layer.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings to make it clear to those skilled in the art how to practice the invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.

Referring to fig. 5 and 6, the sealing and electromagnetic shielding structure for the inverter comprises an inverter 1, a motor 2, a sealing ring 3 and conductive foam 4, wherein the inverter 1 comprises an inverter shell 101 and a three-phase copper bar 102 mounted on the inverter shell 101, the motor 2 comprises a motor shell 201, and the inverter shell 101 and the motor shell 201 are connected through bolts.

Referring to fig. 7 and 8, a sealing ring 3 and a conductive foam 4 are arranged between the three-phase mounting surface of the inverter housing 101 and the three-phase mounting surface of the motor housing 201. In this embodiment, a sealing ring mounting groove and a conductive foam mounting groove are correspondingly formed on the three-phase mounting surface of the inverter housing 101.

The seal ring mounting groove is provided along an edge of a three-phase mounting area on a three-phase mounting surface of the inverter housing 101, the seal ring 3 is mounted in the seal ring mounting groove, and the seal ring 3 is used for sealing between the three-phase mounting surface of the inverter housing 101 and the three-phase mounting surface of the motor housing 201. By adjusting the diameter of the seal ring 3, the function of sealing between the three-phase mounting surfaces of the inverter housing 101 and the motor housing 201 can be achieved, and the sealing effect can be ensured. The tolerance of the original inverter shell 101 and the motor shell 201 needs to be controlled within the range of 0.08mm, the part tolerance of the inverter shell 101 and the motor shell 201 can be widened to 0.3mm, the requirement for controlling the size tolerance of the parts of the inverter shell 101 and the motor shell 201 to be high is greatly reduced, the part cost is effectively reduced, and the finished product rate of the parts is improved.

The cotton mounting groove of electrically conductive bubble is located the inboard of sealing washer mounting groove and sets up in inverter 1's three-phase copper bar 102 week side, the cotton 4 of electrically conductive bubble is installed in the cotton mounting groove of electrically conductive bubble, and the cotton 4 structure of electrically conductive bubble is seen in figure 9 and figure 10, and the cotton 4 of electrically conductive bubble is including the cotton 401 of bubble and wrap up the outer conducting layer 402 of bubble 401, and conducting layer 402 generally adopts electrically conductive cloth. The design allowance of the thickness of the 4 rings of the conductive foam is large, the inverter shell 101 and the three-phase mounting surface of the motor shell 201 are in clearance fit, see a position c in fig. 8, therefore, the three-phase mounting surfaces of the inverter shell 101 and the motor shell 201 do not need to be contacted during mounting, mounting difficulty is reduced, the purpose of contact of the three-phase mounting surfaces is achieved without deformation of parts, at the moment, bolt connection and combination surfaces on the three-phase mounting surfaces of the inverter shell 101 and the motor shell 201 are attached without clearance, and see a position d in fig. 8. And the conductive foam 4 is used for conducting the three-phase mounting surfaces of the inverter shell 101 and the motor shell 201, so that the electromagnetic radiation effect of the three-phase wire on the low-voltage sensor can be completely blocked, and the EMC performance of the inverter is improved from Class3 to Class 4.

The inverter 1 further comprises a low-voltage connector 103 mounted on the inverter housing 101, the inverter housing 101 and the motor housing 201 are respectively provided with a mounting hole 1011 and a jack 2011 corresponding to the low-voltage connector 103, and the motor housing 201 is further provided with a long slot 2012 corresponding to the three-phase copper bar 102 of the inverter 1.

It should be noted that many variations and modifications of the embodiments of the present invention are possible, which are fully described, and are not limited to the specific examples of the above embodiments. The above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.

Claims

1. A sealing and electromagnetic shielding structure for an inverter is characterized by comprising an inverter, a motor, a sealing ring and conductive foam; the inverter comprises an inverter shell, the motor comprises a motor shell, a sealing ring and conductive foam are arranged between the inverter shell and a three-phase mounting surface of the motor shell, the conductive foam is positioned on the inner side of the sealing ring and arranged on the periphery of a three-phase copper bar of the inverter, the conductive foam is in contact with and conducts the three-phase mounting surface of the inverter shell and the three-phase mounting surface of the motor shell, and the inverter shell and the three-phase mounting surface of the motor shell are in clearance fit; the inverter shell is connected with the motor shell through bolts, and bolt connection joint surfaces on three-phase mounting surfaces of the inverter shell and the motor shell are attached without gaps.

2. The inverter sealing and electromagnetic shielding structure according to claim 1, wherein a packing ring mounting groove and a conductive foam mounting groove are formed on a three-phase mounting surface of the inverter case.

3. The sealing and electromagnetic shielding structure for an inverter according to claim 2, wherein the gasket mounting groove is formed along an edge of a three-phase mounting area on a three-phase mounting surface of the inverter housing, the inverter includes a three-phase copper bar mounted on the inverter housing, the motor housing is provided with a long slot hole corresponding to the three-phase copper bar of the inverter, and the conductive foam mounting groove is located inside the gasket mounting groove and disposed around the three-phase copper bar of the inverter.

4. The sealing and electromagnetic shielding structure for an inverter according to claim 1, wherein the inverter further comprises a low-voltage connector mounted on the inverter housing, and the inverter housing and the motor housing are respectively provided with a mounting hole and a receptacle corresponding to the low-voltage connector.

5. The inverter sealing and electromagnetic shielding structure according to any one of claims 1 to 4, wherein the conductive foam comprises foam and a conductive layer wrapped outside the foam.