CN112449668B

CN112449668B - Electric compressor

Info

Publication number: CN112449668B
Application number: CN201980004026.4A
Authority: CN
Inventors: 韩泳敞
Original assignee: Douyuan Heavy Industry Co ltd; Doowon Electronics Co Ltd; Doowon Technical College
Current assignee: Douyuan Heavy Industry Co ltd; Doowon Electronics Co Ltd; Doowon Technical College
Priority date: 2019-06-27
Filing date: 2019-11-14
Publication date: 2022-11-29
Anticipated expiration: 2039-11-14
Also published as: WO2020262773A1; KR102379078B1; CN112449668A; KR20210002203A

Abstract

Provided is a motor-driven compressor, including: a main housing having therein a motor, a rotation shaft rotated by the motor, and a compression unit for sucking and compressing a refrigerant by being rotated by the rotation shaft; an inverter case mounted at a bottom side of the main case; and an inverter module mounted on the inverter case and controlling the motor, wherein the inverter module includes: a cover portion including a cover plate disposed at a bottom side of the inverter case and a cover wall provided along a circumference of the cover plate and disposed to face the inverter case; a control unit disposed at a top side of the cover portion and mounted on the cover plate to be disposed at an inner side of the cover wall; and a bracket portion arranged on a top side of the control unit and fixing the control unit to the cover portion.

Description

Electric compressor

Technical Field

The present disclosure relates to an electric compressor, and more particularly, to an electric compressor for sucking and compressing a refrigerant by driving a motor to which a current is applied from an external power source and then discharging the refrigerant.

Background

Generally, a compressor means a device for sucking and compressing refrigerant stored in an external storage tank, and then supplying and circulating the refrigerant to a desired space or mechanical parts. The compressor is classified into a mechanical type, an electric type, etc. based on the type of a power source, and a vane type, a scroll type, etc. based on a compression method of refrigerant.

Among them, the motor-driven compressor means a compressor for sucking and compressing a refrigerant by a motor to which a driving current is applied from an external power source and then discharging the refrigerant. Such a motor-driven compressor includes a main housing accommodating a motor, a rotation shaft, and a compression unit, an inverter housing mounted at one side of the main housing, and an inverter assembly assembled to the inverter housing and controlling the motor by being connected to an external power source. The inverter assembly includes a control unit mounted on an inverter case and an inverter cover mounted on the inverter case to cover the control unit.

Here, according to a general electric compressor, the control unit and the inverter cover are designed to be separately assembled to the inverter case. In other words, a general electric compressor is designed in the following structure: the control unit is mounted on the inverter case, the inverter cover covers the control unit, and then the main bolt passes through the inverter cover and the inverter case so that the inverter assembly is assembled to the inverter case. Therefore, according to the general motor-driven compressor, not only the process of assembling the inverter assembly to the inverter case is complicated, but also considerable time and effort are required when the inverter assembly is separated due to maintenance, repair, or the like of the inverter assembly.

Description of the embodiments

Technical problem

The present disclosure has been achieved to solve the above-mentioned problems, and has an object to provide a motor-driven compressor including an inverter assembly of a modular structure and thus more simply and easily installing and separating the inverter assembly.

Solution to the problem

According to an aspect of the present disclosure, there is provided a motor-driven compressor including: a main housing, wherein a motor, a rotation shaft rotated by the motor, and a compression unit for sucking and compressing a refrigerant by being rotated by the rotation shaft; an inverter case mounted at a bottom side of the main case; and an inverter module mounted on the inverter case and controlling the motor, wherein the inverter module includes: a cover portion including a cover plate disposed at a bottom side of the inverter case, and a cover wall provided along a circumference of the cover plate and disposed to face the inverter case; a control unit disposed at a top side of the cover portion and mounted on the cover plate to be disposed at an inner side of the cover wall; and a bracket portion that is arranged on a top side of the control unit and fixes the control unit to the cover portion.

The cover portion may further include a plurality of auxiliary fastening ends disposed on the top surface of the cover plate and respectively including a plurality of first cover holes, the bracket portion may include a plurality of bracket holes corresponding to the plurality of first cover holes, and the inverter module may further include a plurality of auxiliary bolts inserted into the plurality of first cover holes and the plurality of bracket holes to fix the bracket portion to the cover portion.

The motor-driven compressor may further include a packing portion mounted on a top surface of the cover wall and disposed around a circumference of the bracket portion.

The filling part may include: a filler core disposed around a circumference of the scaffold portion; and a filler member surrounding an exterior of the filler core, wherein the filler core may be arranged such that: an inner surface facing the bracket portion protrudes further toward the bracket portion than an inner surface of the filling member.

The filling part may further include a plurality of filling protrusions protruding from a bottom surface of the filling member facing the cover wall toward the cover wall, extending along a circumferential direction of the filling member, and spaced apart from each other in a direction from an inner surface of the filling member to an outer surface of the filling member.

The filling part may further include a plurality of fixing protrusions spaced apart from each other in a circumferential direction of the filling core from an inner surface of the filling core and inserted into fixing grooves provided in the holder part.

The cover part may further include a plurality of insertion ends spaced apart from each other in a circumferential direction of the cover wall from an inner surface of the cover wall and respectively including a plurality of second cover holes, a plurality of bracket flanges respectively mounted on the plurality of insertion ends may be provided on an outer surface of the bracket part, and the motor-driven compressor may further include a plurality of main bolts respectively inserted into the plurality of second cover holes to fix the inverter module to the inverter case.

When the bracket portion is disposed between the inverter case and the cover portion, the amount of pressurization of the cover wall to the filling portion can be adjusted.

Advantageous effects of the disclosure

According to the motor-driven compressor of the present disclosure, by including the inverter module designed to include the cover portion, the control unit mounted on the cover portion, and the bracket portion disposed between the control unit and the inverter case and fixing the control unit to the cover portion, modularization of the inverter assembly included in a general motor-driven compressor can be achieved.

Therefore, according to the motor-driven compressor of the present disclosure, the inverter module may be assembled and separated with respect to the inverter case via a single process without separately mounting components of the inverter module to the inverter case, and thus, time and effort required to mount and separate the inverter module may be significantly reduced.

Drawings

Fig. 1 is a perspective view of a motor-driven compressor according to the present disclosure.

Fig. 2 is an exploded perspective view of the inverter module shown in fig. 1.

Fig. 3 isbase:Sub>A cross-sectional view of the inverter module and the inverter case cut along linebase:Sub>A-base:Sub>A of fig. 1 when the inverter module is mounted on the inverter case in fig. 1.

Fig. 4 is an enlarged perspective view of the region B shown in fig. 2.

Fig. 5 is a view of the inverter module viewed from the inverter case when each component of the inverter module of fig. 2 is assembled.

Fig. 6 is an enlarged perspective view of the region C shown in fig. 5.

Fig. 7 is a front view of the filling part shown in fig. 2.

Fig. 8 is a cross-sectional view of the filled part shown in fig. 7, cut along line D-D.

Best mode

The present disclosure is described with reference to the embodiments shown in the drawings, but the embodiments are merely examples, and it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims.

Referring to fig. 1 to 8, the motor-driven compressor 1000 according to the present disclosure includes a main housing 1100, an inverter housing 1200, an inverter module 1300, and a plurality of main bolts 1400.

Referring to fig. 1, a main housing 1100 accommodates a motor (not shown) therein. The motor is driven by receiving current from an external power source. In order to compress the refrigerant sucked into the main casing 1100, a rotating shaft (not shown) combined to a motor and a compression unit (not shown) combined to the rotating shaft are installed in the main casing 1100. The rotation shaft is rotated by the motor by being combined with the motor. The compression unit is combined with the rotating shaft and rotates together with the rotating shaft. When the motor-driven compressor 1000 according to the present disclosure is a scroll compressor, the compression unit may correspond to the fixed scroll and the orbiting scroll. Meanwhile, the compression unit is not necessarily mounted only inside the main casing 1100, but may be mounted outside the main casing 1100.

Referring to fig. 1 to 3, the inverter case 1200 is mounted on the bottom side of the main case 1100, and the inverter module 1300 is assembled from the bottom side. The inverter case 1200 includes a case plate 1210, a case wall 1220, and a plurality of case combining ends 1230. The housing plate 1210 is combined to the bottom side of the main housing 1100. The housing wall 1220 is provided along the circumference of the housing plate 1210 and is disposed to face the bottom side. A plurality of housing combination ends 1230 are disposed on an inner wall of the housing wall 1220 and spaced apart from each other along a circumferential direction of the housing wall 1220. Further, a housing aperture 1231 into which the main bolt 1400 is inserted is provided between the housing wall 1220 and the housing combination end 1230.

Referring to fig. 2 to 8, the inverter module 1300 includes a cover portion 1310, a control unit 1320, a bracket portion 1330, a plurality of auxiliary bolts 1340, and a filling portion 1350.

Referring to fig. 2 and 3, the cover portion 1310 is disposed at the lowermost side of the motor-driven compressor 1000 according to the present disclosure, and the control unit 1320, the bracket portion 1330, the plurality of auxiliary bolts 1340, and the filling portion 1350 are disposed therein. In addition, a cover portion 1310 is mounted on the bottom side of the inverter housing 1200 to fix the control unit 1320, the bracket portion 1330, the plurality of auxiliary bolts 1340, and the filling portion 1350 to the inverter housing 1200 and the main housing 1100. In this regard, the lid portion 1310 includes a lid plate 1311, a lid wall 1312, a plurality of auxiliary fastening ends 1313, and a plurality of insertion ends 1315. The cover wall 1312 is provided along the circumference of the cover plate 1311 and is arranged to face the inverter case 1200. Here, the cover wall 1312 is arranged to face the housing wall 1220. Therefore, when the inverter module 1300 is mounted on the inverter case 1200, a filling portion 1350 described later is provided between the cover wall 1312 and the case wall 1220.

A plurality of auxiliary fastening ends 1313 are disposed on the top surface of the cover plate 1311, and each auxiliary fastening end 1313 includes a first cover hole 1314 into which an auxiliary bolt 1340 is inserted. A plurality of insertion ends 1315 are provided on an inner wall of the cover wall 1312 and spaced apart from each other along a circumferential direction of the cover wall 1312. Each of the plurality of insertion ends 1315 includes a second blind hole 1316. In particular, second cap hole 1316 is disposed between cap wall 1312 and insertion end 1315. Here, the plurality of insertion ends 1315 are respectively arranged to face the plurality of housing combining ends 1230. Further, the plurality of second cover holes 1316 are respectively arranged to form concentric circles with the plurality of housing holes 1231. Accordingly, the plurality of main bolts 1400 are respectively inserted into the plurality of second cover holes 1316 and the plurality of housing holes 1231, thereby fixing the inverter module 1300 to the inverter housing 1200.

The control unit 1320 is mounted on the top surface of the cover plate 1311 and is disposed inside the cover wall 1312. The control unit 1320 controls the motor based on a current applied from an external power source (not shown).

Referring to fig. 2 to 5, a bracket portion 1330 is disposed on a top side of the control unit 1320 to cover the control unit 1320 and is mounted on the cover portion 1310 to fix the control unit 1320 to the cover portion 1310. The bracket portion 1330 may be designed to cover all of the control unit 1320 or only a portion of the control unit 1320. Further, unlike that shown in fig. 2 to 5, the bracket portion 1330 may secure the control unit 1320 to the cover portion 1310 at a radially outer side of the control unit 1320.

The bracket portion 1330 includes a plurality of bracket holes 1331, a plurality of bracket flanges 1332, and a plurality of fixing grooves 1334. The plurality of holder holes 1331 are provided at positions corresponding to the plurality of first cover holes 1314, respectively. In addition, a plurality of auxiliary bolts 1340 are each inserted into the bracket hole 1331 and the first cover hole 1314 from the top side of the bracket portion 1330 to fix the bracket portion 1330 to the cover portion 1310. Here, the control unit 1320 may include a plurality of penetration holes (not shown) at positions corresponding to the plurality of bracket holes 1331 and the plurality of first cover holes 1314 such that the plurality of auxiliary bolts 1340 penetrate therethrough.

Thus, the inverter module 1300 is designed in the following structure: wherein the cover portion 1310 is mounted on the control unit 1320, the bracket portion 1330 covers the control unit 1320, and the plurality of auxiliary bolts 1340 fix the bracket portion 1330 to the cover portion 1310, and thus the inverter module 1300 may be designed in a structure that is modularized with respect to the inverter housing 1200 and the main housing 1100. Therefore, according to the motor-driven compressor 1000 of the present disclosure, the inverter module 1300 can be further quickly and accurately mounted and separated with respect to the inverter case 1200 and the main case 1100.

Referring to fig. 3 to 6, a bracket flange 1332 is provided on a circumferential surface of the bracket portion 1330 facing the filling portion 1350. Additionally, a bracket flange 1332 is disposed between the housing combination end 1230 and the insertion end 1315. Here, the bracket flange 1332 includes a flange slot 1333 at a side of the filling part 1350. As shown in fig. 5 and 6, the flange slot 1333 is provided to overlap a portion of the second cover hole 1315 when viewed from the inverter case 1200. In addition, a filling groove 1355 of a filling part 1350, which will be described later, is provided to overlap with the remaining portion of the second cover hole 1316 that is not overlapped by the flange groove 1333. In other words, when the filling part 1350 is provided along the circumference of the bracket part 1330, a filling groove 1355 and a flange groove 1333, which will be described later, are formed in the same shape as the second cover hole 1316. In addition, as shown in fig. 3, a plurality of main bolts 1400 are each inserted into the second cover hole 1316, the flange groove 1333, the filling groove 1355, and the housing hole 1231 from the bottom side of the cover portion 1310 in order, thereby fixing and assembling the inverter module 1300 to the inverter housing 1200.

Here, a plurality of auxiliary bolts 1340 are provided for modularization of the inverter module 1300. In other words, referring to fig. 2, a plurality of auxiliary bolts 1340 are inserted into the bracket portion 1330, the control unit 1320, and the cover portion 1310 in order from the top side of the inverter module 1300, thereby fixing the control unit 1320 and the bracket portion 1330 to the cover portion 1310. On the other hand, a plurality of main bolts 1400 are provided to couple the inverter module 1300, which has been designed to form a modular structure, to the inverter case 1200. In other words, referring to fig. 1, a plurality of main bolts 1400 are inserted into the inverter module 1300 and the inverter case 1200 from the bottom side of the inverter module 1300 to fix the inverter module 1300 to the inverter case 1200. Therefore, the auxiliary bolt 1340 and the main bolt 1400 are different from each other with respect to the insertion direction and function.

Referring back to fig. 5 and 6, a plurality of fixing grooves 1334 are provided on a circumferential surface of the bracket portion 1330, and are spaced apart from each other along a circumferential direction of the bracket portion 1330. In addition, a plurality of fixing protrusions 1354 of a filling part 1350, which will be described later, are inserted into the plurality of fixing grooves 1334, respectively. Accordingly, the filling part 1350 is maintained in a fixed state by the plurality of fixing protrusions 1354 without rotating in the circumferential direction of the holder part 1330.

Referring to fig. 5 to 8, a fill portion 1350 is provided between the cover wall 1312 and the housing wall 1220 and is arranged around the circumference of the bracket portion 1330 to seal between the inverter module 1300 and the inverter housing 1200. In this aspect, the filling portion 1350 includes a filling core 1351, a filling member 1352, a plurality of filling protrusions 1353, and a plurality of fixing protrusions 1354, and includes a plurality of filling grooves 1355.

Referring to fig. 8, a filler core 1351 is arranged around the circumference of the scaffold portion 1330. The filler member 1352 is disposed around an outer portion of the filler core 1351. Here, the filling core 1351 may be arranged such that an inner surface facing the circumferential surface of the scaffold portion 1330 further protrudes toward the scaffold portion 1330 based on the inner surface of the filling member 1352. The filler member 1352 may be manufactured via an insert injection method with respect to the filler core 1351, but is not limited thereto.

A plurality of filling protrusions 1353 are disposed on a top surface of the filling member 1352 facing the housing wall 1220 and a bottom surface of the filling member 1352 facing the cover wall 1312. In particular, a plurality of filling protrusions 1353 protrude from the top and bottom surfaces of the filling member 1352, respectively, and extend along the circumference of the filling member 1352. Further, among the filling members 1352, when a surface facing the circumferential surface of the holder portion 1330 is an inner surface and a surface facing the inner surface of the filling member 1352 or the remaining surfaces other than the top surface, the bottom surface, or the inner surface of the filling member 1352 is an outer surface, the plurality of filling protrusions 1353 are spaced apart from each other in a direction from the inner surface to the outer surface of the filling member 1352 (or a direction from the outer surface to the inner surface). Thus, when the plurality of filling protrusions 1353 are disposed on the top and bottom surfaces of the filling member 1352, the housing wall 1220 and the cover wall 1312 are further brought into close contact with each other, and thus the space between the housing wall 1220 and the cover wall 1312 may be further effectively sealed.

A plurality of fixing protrusions 1354 are disposed on the inner surface of the filling core 1351 and spaced apart from each other along the circumferential direction of the filling core 1351. Further, the plurality of fixing protrusions 1354 are respectively inserted into the plurality of fixing grooves 1334 by being disposed at positions corresponding to the plurality of fixing grooves 1334 provided on the circumferential surface of the bracket portion 1330. Accordingly, the plurality of fixing protrusions 1354 enables the filling part 1350 to maintain a fixed state without rotating along the circumferential direction of the holder part 1330.

A plurality of filling grooves 1355 are provided on the inner surface of the filling core 1351 and are spaced apart from each other along the circumferential direction of the filling core 1351. Here, the plurality of filling slots 1355 are provided at positions corresponding to the plurality of flange slots 1333 to face the plurality of flange slots 1333. Also, as described above, the filling slots 1355 together with the flange slots 1333 form the same shape as the second blind hole 1316 and form concentric circles with the second blind hole 1316. The main bolt 1400 is inserted into the second cover hole 1316, the flange slot 1333, the filling slot 1355, and the housing hole 1231 to fix the inverter module 1300 to the inverter housing 1200. Here, as shown in fig. 3, the main bolt 1400 passes between the bracket flange 1332 and the filling part 1350.

As described above, according to the motor-driven compressor 1000 of the present disclosure, by providing the inverter module 1300 designed to include: the cover portion 1310, the control unit 1320 mounted on the cover portion 1310, and the bracket portion 1330 disposed between the control unit 1320 and the inverter housing 1200 and fixing the control unit 1320 to the cover portion 1310 may achieve modularization of the inverter assembly included in a general electric compressor.

Therefore, according to the motor-driven compressor 1000 of the present disclosure, the inverter module 1300 may be assembled and separated with respect to the inverter case 1200 through a single process without having to separately install the components of the inverter module 1300 to the inverter case 1200, and thus, time and effort required to install and separate the inverter module 1300 may be significantly reduced.

Meanwhile, according to the motor-driven compressor 1000 of the present disclosure, when the bracket portion 1330 is disposed between the inverter housing 1200 and the cover portion 1310, the pressurization amount of the cover wall 1312 to the filling portion 1350 is adjusted. In particular, with reference to fig. 3, when the bracket flange 1332 is disposed between the housing combination end 1230 and the insertion end 1315, the amount of pressurization of the cover wall 1312 to the filling portion 1350 is controlled to a predetermined value or less.

When the bracket flange 1332 is not disposed between the housing combining end 1230 and the insertion end 1315, the motor-driven compressor 1000 according to the present disclosure has only the filling portion 1350 disposed between the housing wall 1220 and the cover wall 1312. At this time, when the tightening amount of the main bolt 1400 increases, the filling part 1350 is subjected to an excessive pressure in the insertion direction of the main bolt 1400, and thus the filling part 1350 is excessively compressed and damaged. Further, when the filling part 1350 is damaged, the sealing performance of the filling part 1350 is degraded, and air, dust, refrigerant, etc. may be introduced between the housing wall 1220 and the cover wall 1312.

However, when the bracket flange 1332 is disposed between the housing combining end 1230 like the motor-driven compressor 1000 according to the present disclosure and the insertion end 1315, even when the main bolt 1400 is excessively tightened, the filling part 1350 may be prevented from being compressed to a thickness smaller than that of the bracket flange 1332 by the presence of the bracket flange 1332. Therefore, according to the motor-driven compressor 1000 of the present disclosure, when the bracket portion 1330 is disposed between the inverter housing 1200 and the cover portion 1310, the pressurization amount of the cover wall 1312 to the filling portion 1350 is adjusted, and thus the thickness of the filling portion 1350 may be prevented from being reduced below the reference value.

Claims

1. An electric compressor comprising:

a main housing having therein a motor, a rotation shaft rotated by the motor, and a compression unit for sucking and compressing a refrigerant by being rotated by the rotation shaft;

an inverter case mounted at a bottom side of the main case; and

an inverter module mounted on the inverter case and controlling the motor, wherein the inverter module includes:

a cover portion including a cover plate disposed at a bottom side of the inverter case, and a cover wall provided along a circumference of the cover plate and disposed to face the inverter case;

a control unit disposed at a top side of the cover portion and mounted on the cover plate to be disposed at an inner side of the cover wall; and

a bracket portion arranged at a top side of the control unit and fixing the control unit to the cover portion;

a filling part mounted on a top surface of the cap wall and arranged to surround a circumference of the bracket part, wherein the filling part includes:

a filler core disposed around a circumference of the scaffold portion; and

a filler member surrounding an exterior of the filler core,

wherein the filler core is arranged such that an inner surface facing the scaffold portion protrudes further towards the scaffold portion than an inner surface of the filler member.

2. The motor-compressor of claim 1, wherein the cover portion further includes a plurality of auxiliary fastening ends provided on a top surface of the cover plate and respectively including a plurality of first cover holes,

the bracket portion includes a plurality of bracket holes corresponding to the plurality of first cover holes, and the inverter module further includes a plurality of auxiliary bolts inserted into the plurality of first cover holes and the plurality of bracket holes to fix the bracket portion to the cover portion.

3. The motor-driven compressor according to claim 1, wherein the filling portion further includes a plurality of filling protrusions protruding from a bottom surface of the filling member facing the cover wall toward the cover wall, extending along a circumferential direction of the filling member, and spaced apart from each other in a direction from an inner surface to an outer surface of the filling member.

4. The motor-driven compressor according to claim 1, wherein the filling portion further includes a plurality of fixing protrusions which are spaced apart from each other in a circumferential direction of the filling core from an inner surface of the filling core and are inserted into fixing grooves provided in the bracket portion.

5. The motor-driven compressor of claim 1, wherein the cover portion further includes a plurality of insertion ends spaced apart from each other in a circumferential direction of the cover wall from an inner surface of the cover wall and respectively including a plurality of second cover holes,

a plurality of holder flanges mounted on the plurality of insertion ends, respectively, are provided on an outer surface of the holder portion, and

the motor-driven compressor further includes a plurality of main bolts inserted into the plurality of second cover holes, respectively, to fix the inverter module to the inverter case.

6. The electric compressor according to claim 5, wherein when the bracket portion is provided between the inverter housing and the cover portion, a pressing amount of the cover wall to the filling portion is adjusted.