US20200109711A1 - Scroll compressor - Google Patents

Scroll compressor Download PDF

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Publication number
US20200109711A1
US20200109711A1 US16/500,328 US201816500328A US2020109711A1 US 20200109711 A1 US20200109711 A1 US 20200109711A1 US 201816500328 A US201816500328 A US 201816500328A US 2020109711 A1 US2020109711 A1 US 2020109711A1
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US
United States
Prior art keywords
refrigerant
scroll
plate
partition plate
fixed scroll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/500,328
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English (en)
Inventor
Yoshiyuki Futagami
Yusuke Imai
Atsushi Sakuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. reassignment PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUTAGAMI, YOSHIYUKI, IMAI, YUSUKE, SAKUDA, ATSUSHI
Publication of US20200109711A1 publication Critical patent/US20200109711A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet

Definitions

  • the present invention relates to a scroll compressor.
  • a hermetic type scroll compressor in which a compressing element having a fixed scroll and an orbiting scroll placed in a partitioned low-pressure space and a motor for orbiting and driving the orbiting scroll are disposed by providing a partition plate in an airtight container.
  • refrigerant is introduced into the low-pressure space the an airtight container through a refrigerant intake tube. At that time, the refrigerant collides against an intake baffle provided in the low-pressure space, and the refrigerant after collision flows into a compressing element. It is disclosed that the refrigerant which is compressed by the compressing element is discharged into a high-pressure space partitioned by the partition plate through a discharge port of the fixed scroll (see patent document 1 for example).
  • Patent Document 1 Japanese Patent Application Laid-open No.H4-255595
  • the partition plate Since the partition plate is in contact with the high-pressure space, the partition plate is in a high-temperature state. Hence, since the refrigerant comes into contact with the partition plate and is heated, there is a problem that density of the refrigerant which is sucked into the compressing element is lowered, and volumetric efficiency is deteriorated.
  • the present invention solves the conventional problem, and it is an object of the invention to provide a scroll compressor which can enhance the volumetric efficiency.
  • the present invention provides a scroll compressor including: a partition plate for dividing an interior of an airtight container into a high-pressure space and a low-pressure space; a fixed scroll which is adjacent to the partition plate; an orbiting scroll which is meshed with the fixed scroll and which forms a compression chamber; a rotation-suppressing member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll; in which the fixed scroll, the orbiting scroll, the rotation-suppressing member and the main bearing are placed in the low-pressure space, and the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing, wherein a refrigerant intake tube for making the low-pressure space suck refrigerant is provided in the airtight container, and the scroll compressor includes a straightening plate against which refrigerant introduced from the refrigerant intake tube collides, and a shielding plate provided at a height position between the partition plate and an intake portion of the fixed scroll.
  • the refrigerant since the sucked refrigerant does not come into direct contact with the partition plate, the refrigerant is not heated by the partition plate, it is possible to suppress the reduction of the suction density and an enhancing effect of the volumetric efficiency can be obtained.
  • FIG. 1( a ) is a vertical sectional view showing a configuration of a scroll compressor according to a first embodiment of the present invention
  • FIG. 1( b ) is a sectional view a fixed scroll shown in FIG. 2( a ) as viewed from above;
  • FIG. 2 is a perspective view of a member in which a straightening plate and a shielding plate of the scroll compressor in the first embodiment of the invention are integrally formed together;
  • FIG. 3( a ) is a vertical sectional view showing a configuration of a scroll compressor according to another embodiment of the invention.
  • FIG. 3( b ) is a sectional view of a fixed scroll shown in FIG. 3( a ) as viewed from above.
  • a first aspect provides a scroll compressor including: a partition plate for dividing an interior of an airtight container into a high-pressure space and a low-pressure space; a fixed scroll which is adjacent to the partition plate; an orbiting scroll which is meshed with the fixed scroll and which forms a compression chamber; a rotation-suppressing member for preventing the orbiting scroll from rotating; and a main bearing for supporting the orbiting scroll; in which the fixed scroll, the orbiting scroll, the rotation-suppressing member and the main bearing are placed in the low-pressure space, and the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing, wherein a refrigerant intake tube for making the low-pressure space suck refrigerant is provided in the airtight container, and the scroll compressor includes a straightening plate against which refrigerant introduced from the refrigerant intake tube collides, and a shielding plate provided at a height position between the partition plate and an intake portion of the fixed scroll.
  • the sucked refrigerant is not heated by the partition plate, reduction in intake density can be suppressed and an enhancing effect of volumetric efficiency can be obtained.
  • the shielding plate is provided on an inner wall of the airtight container.
  • vibration of the shielding plate can be reduced, heat conduction from the fixed scroll can be reduced, and it is possible to efficiently introduce refrigerant into the compression chamber without heating the refrigerant.
  • the shielding plate is provided in the fixed scroll.
  • the shielding plate covers an upper opening of the straightening plate and covers an opening range of the intake portion of at least the fixed scroll.
  • the sucked refrigerant can once collide against the shielding plate and the refrigerant can smoothly flow into the intake portion of the fixed scroll. Therefore, the sucked refrigerant is not heated by the partition plate and reduction in density of the sucked refrigerant can be suppressed, resistance of a flowing passage of the fixed scroll into the intake portion is low and therefore, the efficient enhancing effect can be obtained.
  • the straightening plate and the shielding plate are integrally formed together.
  • the shielding plate can be placed at a position where refrigerant which flows out from the straightening plate reliably collides.
  • FIG. 1( a ) is a vertical sectional view of a scroll compressor according to a first embodiment.
  • a vertical direction in the embodiments of the present invention is a Z-axial direction in the drawings.
  • a compressor 1 includes, as an outer shell, a cylindrical airtight container 10 having a longitudinal direction extending in the vertical direction.
  • the compressor 1 is a hermetic type scroll compressor including, in the airtight container 10 , a compression mechanism 170 which compresses refrigerant and a motor 80 for driving the compression mechanism 170 .
  • the compression mechanism 170 is composed of at least a fixed scroll 30 , an orbiting scroll 40 , a main bearing 60 and an Oldham ring 90 .
  • a partition plate 20 for vertically partitioning an interior of the airtight container 10 is provided in the airtight container 10 at a high location.
  • the partition plate 20 divides the interior of the airtight container 10 into a high-pressure space 11 and a low-pressure space 12 .
  • the high-pressure space 11 is a space filled with high pressure refrigerant after the refrigerant is compressed by the compression mechanism 170 .
  • the low-pressure space 12 is a space filled with low pressure refrigerant before the refrigerant is compressed by the compression mechanism 170 .
  • the airtight container 10 includes a refrigerant intake tube 13 which brings outside of the airtight container 10 and the low-pressure space 12 into communication with each other, and a refrigerant discharge tube 14 which brings the outside of the airtight container 10 and the high-pressure space 11 into communication with each other.
  • the compressor 1 introduces low pressure refrigerant from a refrigeration cycle circuit (not shown) provided outside the airtight container 10 into the low-pressure space 12 through the refrigerant intake tube 13 .
  • High pressure refrigerant compressed by the compression mechanism 170 is first introduced into the high-pressure space 11 . Thereafter, the high pressure refrigerant is discharged from the high-pressure space 11 into the refrigeration cycle circuit through the refrigerant discharge tube 14 .
  • An oil reservoir 15 in which lubricant oil is stored is formed in a bottom of the low-pressure space 12 .
  • the compressor 1 includes the fixed scroll 30 and the orbiting scroll 40 in the low-pressure space 12 .
  • the fixed scroll 30 is a non-orbiting scroll.
  • the fixed scroll 30 is placed below the partition plate 20 in adjacent thereto.
  • the orbiting scroll 40 is placed below the fixed scroll 30 such that the orbiting scroll 40 meshes with the fixed scroll 30 .
  • the fixed scroll 30 includes a disk-shaped fixed scroll end plate 31 and a spiral-shaped fixed spiral lap 32 which stands on a lower surface of the fixed scroll end plate 31 .
  • the orbiting scroll 40 includes a disk-shaped orbiting scroll end plate 41 , a spiral-shaped orbiting spiral lap 42 standing from an upper surface of the orbiting scroll end plate 41 , and a lower boss portion 43 .
  • the lower boss portion 43 is a cylindrical projection which is formed at a substantially central portion of a lower surface of an orbiting scroll end plate 41 .
  • a compression chamber 50 is formed between the orbiting scroll 40 and the fixed scroll 30 .
  • the compression chamber 50 is formed on an inner wall side and an outer wall side of the orbiting spiral lap 42 .
  • the main bearing 60 which supports the orbiting scroll 40 is provided below the fixed scroll 30 and the orbiting scroll 40 .
  • the orbiting scroll 40 is placed between the fixed scroll 30 and the main bearing 60 .
  • a bearing portion 61 is formed on a central portion of the main bearing 60 , and the main bearing 60 is fixed to an inner wall of the airtight container 10 .
  • a rotation shaft 70 has a longitudinal direction extending in the vertical direction in FIG. 1 .
  • One end of the rotation shaft 70 is pivotally supported by the bearing portion 61 , and the other end of the rotation shaft 70 is pivotally supported by an auxiliary bearing 16 .
  • the auxiliary bearing 16 is a bearing provided below the low-pressure space 12 , preferably in the oil reservoir 15 .
  • An upper end of the rotation shaft 70 is provided with an eccentric shaft 71 which is eccentric with respect to an axis of the rotation shaft 70 .
  • the eccentric shaft 71 is slidably inserted into the lower boss portion 43 through a swing bush 78 and a slewing bearing 79 .
  • the lower boss portion 43 is orbited and driven by the eccentric shaft 71 .
  • An oil passage 72 through which lubricant oil passes is formed in the rotation shaft 70 .
  • the oil passage 72 is a through hole formed in an axial direction of the rotation shaft 70 .
  • One end of the oil passage 72 opens into the oil reservoir 15 as a suction port 73 provided in a lower end of the rotation shaft 70 .
  • a paddle 74 for pumping lubricant oil from the suction port 73 into the oil passage 72 is provided in an upper portion of the suction port 73 .
  • the rotation shaft 70 is connected to the motor 80 .
  • the motor 80 is placed between the main bearing 60 and the auxiliary bearing 16 .
  • the motor 80 includes a stator 81 fixed to the airtight container 10 , and a rotor 82 placed inside the stator 81 .
  • a rotation-suppressing member (Oldham ring) 90 is provided between the orbiting scroll 40 and the main bearing 60 .
  • the Oldham ring 90 prevents the orbiting scroll 40 from rotating. According to this, the orbiting scroll 40 orbits without rotating with respect to the fixed scroll 30 .
  • the rotation-suppressing member 90 it is also possible to use mechanisms disclosed in JP1984-58188A, JP1985-104787A, JP1990-140483A, JP1994-330870A, JP1996-74754A, JP2003-201977A and JP1999-148473A in addition to the Oldham ring.
  • the fixed scroll 30 , the orbiting scroll 40 , the motor 80 , the Oldham ring 90 and the main bearing 60 are placed in the low-pressure space 12 .
  • the fixed scroll 30 and the orbiting scroll 40 are placed between the partition plate 20 and the main bearing 60 .
  • the partition plate 20 and the main bearing 60 are fixed to the airtight container 10 .
  • At least one of the fixed scroll 30 and the orbiting scroll 40 provided with an elastic body (not shown) is axially movably provided in at least a portion between the partition plate 20 and the main bearing 60 , more specifically between the partition plate 20 and the orbiting scroll 40 , or between the fixed scroll 30 and the main bearing 60 .
  • a straightening plate 160 is provided between the refrigerant intake tube 13 and the intake portion 38 of the compression mechanism 170 .
  • the straightening plate 160 is placed at a position opposed to a suction port of the refrigerant intake tube 13 .
  • an upper opening 160 a is formed above the straightening plate 160 on the side of the refrigerant intake tube 13
  • a lower opening 160 b is formed below the straightening plate 160 on the side of the refrigerant intake tube 13 .
  • the refrigerant is introduced from the refrigerant intake tube 13 into the low-pressure space 12 . Then, the refrigerant which is introduced into the low-pressure space 12 collides against the straightening plate 160 , and split-flows in a direction of the partition plate 20 and in a direction of the motor 80 .
  • the refrigerant which collides against the straightening plate 160 changes its flowing direction, and flows from the upper opening 160 a toward the partition plate 20 , and flows from the lower opening 160 b toward the motor 80 .
  • the refrigerant which split-flows in the direction of the partition plate 20 is sucked by the compression chamber 50 , and the refrigerant which is compressed by the compression chamber 50 is discharged from the refrigerant discharge tube 14 through the high-pressure space 11 .
  • a shielding plate 180 is provided at a height position between the intake portion 38 of the fixed scroll 30 and the partition plate 20 .
  • the refrigerant which is introduced from the refrigerant intake tube 13 split-flows by the straightening plate 160 and flows toward the partition plate 20 , but since the shielding plate 180 is provided at the height position between the intake portion 38 of the fixed scroll 30 and the partition plate 20 , and the refrigerant is introduced by the compression chamber 50 without colliding against the partition plate 20 whose temperature becomes relatively high.
  • the sucked refrigerant is not heated by the partition plate 20 , reduction in refrigerant density can be suppressed, and efficiency enhancing effect of the compressor can be obtained.
  • the shielding plate 180 can be provided inside the airtight container 10 .
  • vibration of the shielding plate can be reduced, and heat conduction from the fixed scroll 30 can also be reduced. Therefore, it is possible to efficiently introduce the refrigerant into the compression chamber 50 without heating the refrigerant.
  • the shielding plate 180 may integrally be formed together with the straightening plate 160 as shown in FIG. 2 .
  • the straightening plate 160 is held by a pair of side plates 160 c, and mounting materials 160 d are connected to the pair of side plates 160 c, respectively.
  • the straightening plate 160 is placed at a position separated away from the suction port of the refrigerant intake tube 13 by a predetermined distance by the pair of side plates 160 c, and the straightening plate 160 is mounted on an inner wall of the airtight container 10 by the mounting materials 160 d.
  • the shielding plate 180 is formed on upper ends of the pair of side plates 160 c.
  • a space is famed between the pair of side plates 160 c, a space between lower ends of the pair of side plates 160 c is opened, and a space between rear ends (ends thereof on the side of airtight container) of the pair of side plates 160 c is opened.
  • the space between rear ends (ends thereof on the side of airtight container) of the pair of side plates 160 c maybe opened at least at a position of the suction port of the refrigerant intake tube 13 .
  • the straightening plate 160 is opposed to the suction port of the refrigerant intake tube 13 .
  • a space between the upper end of the straightening plate 160 and a front end (end opposite to airtight container) of the shielding plate 180 is opened and is placed at a position opposed to the intake portion 38 of the compression mechanism 170 .
  • the straightening plate 160 , the side plates 160 c, the mounting materials 160 d and the shielding plate 180 may be formed from one plate material, but they may integrally formed together by bonding at least any of the straightening plate 160 , the side plates 160 c, the mounting materials 160 d and the shielding plate 180 .
  • the shielding plate 180 and the straightening plate 160 are integrally formed together, the shielding plate 180 can be placed at a position where refrigerant which flows out from the straightening plate 160 reliably collides against the shielding plate 180 , and the shielding plate 180 can easily be placed on the inner wall of the airtight container 10 .
  • FIG. 3( a ) is a vertical sectional view of a scroll compressor according to another embodiment of the invention.
  • the same symbols are allocated to the same members as those shown in FIGS. 1 , and description thereof will be omitted.
  • the shielding plate 180 can be provided on the fixed scroll 30 .
  • the shielding plate 180 can easily be fixed without welding the shielding plate 180 to the fixed scroll 30 through a bolt or the like.
  • the shielding plate 180 is placed at the upper side opposed position of the upper opening 160 a of the straightening plate 160 as shown in FIGS. 1 (b) and 3 (b) . According to this, the upper opening 160 a of the straightening plate 160 is covered.
  • the shielding plate 180 is placed at a position covering an opening range r in a radial direction in the intake portion 38 of at least the fixed scroll 30 from above, and is placed at a position covering an opening range ⁇ in the radial direction from above.
  • suction refrigerant which split-flows by the straightening plate 160 and flows into the low-pressure space 12 from the upper opening 160 a of the straightening plate 160 collides against the shielding plate 180 provided to cover the upper opening 160 a of the straightening plate 160 and then, the refrigerant smoothly flows into the intake portion 38 of the fixed scroll 30 . Therefore, the refrigerant is not heated by the partition plate 20 whose temperature becomes relatively high. Therefore, reduction in density of the suction refrigerant can be suppressed, resistance of the flowing passage into the intake portion 38 of the fixed scroll 30 is small, the refrigerant can flows into the intake portion 38 and therefore, the efficiency enhancing effect can be obtained.
  • the scroll compressor of the present invention is useful for a compressor of a refrigeration cycle apparatus, and the scroll compressor can be applied to electrical products such as a hot water supplying system, a hot-water heating system and an air conditioner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US16/500,328 2017-04-04 2018-03-23 Scroll compressor Abandoned US20200109711A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017-074136 2017-04-04
JP2017074136 2017-04-04
PCT/JP2018/011640 WO2018186203A1 (ja) 2017-04-04 2018-03-23 スクロール圧縮機

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US20200109711A1 true US20200109711A1 (en) 2020-04-09

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ID=63712100

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/500,328 Abandoned US20200109711A1 (en) 2017-04-04 2018-03-23 Scroll compressor

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US (1) US20200109711A1 (ja)
JP (1) JPWO2018186203A1 (ja)
CN (1) CN110494653A (ja)
WO (1) WO2018186203A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11326599B2 (en) * 2018-11-20 2022-05-10 Samsung Electronics Co., Ltd. Compressor having surface of scroll compressor defining boundary of inlet and surface guide defining boundary of vent facing each other and electronic device using the same

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03130589A (ja) * 1989-10-13 1991-06-04 Mitsubishi Electric Corp スクロール圧縮機
US5055010A (en) * 1990-10-01 1991-10-08 Copeland Corporation Suction baffle for refrigeration compressor
CN1033222C (zh) * 1991-10-03 1996-11-06 株式会社日立制作所 用于加工涡旋导片的立铣刀
JP3709745B2 (ja) * 1999-07-30 2005-10-26 豊田工機株式会社 オイルポンプ用の熱遮蔽板の取付構造
US6287089B1 (en) * 1999-11-29 2001-09-11 Scroll Technologies Scroll compressor with heat shield
KR100696123B1 (ko) * 2005-03-30 2007-03-22 엘지전자 주식회사 스크롤 압축기의 고정스크롤
JP4965379B2 (ja) * 2007-08-08 2012-07-04 サンデン株式会社 スクロール型流体機械
JP5362239B2 (ja) * 2008-03-19 2013-12-11 三洋電機株式会社 スクロール圧縮機
FR2968732B1 (fr) * 2010-12-14 2015-05-29 Danfoss Commercial Compressors Compresseur frigorifique a spirales
CN202926627U (zh) * 2012-10-17 2013-05-08 大连三洋压缩机有限公司 一种涡旋式压缩机
JP6484796B2 (ja) * 2014-04-24 2019-03-20 パナソニックＩｐマネジメント株式会社 スクロール圧縮機
JP2016094824A (ja) * 2014-11-12 2016-05-26 パナソニックＩｐマネジメント株式会社 圧縮機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11326599B2 (en) * 2018-11-20 2022-05-10 Samsung Electronics Co., Ltd. Compressor having surface of scroll compressor defining boundary of inlet and surface guide defining boundary of vent facing each other and electronic device using the same

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WO2018186203A1 (ja) 2018-10-11
JPWO2018186203A1 (ja) 2020-02-13
CN110494653A (zh) 2019-11-22

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