CN109217564A - Totally-enclosed-type rotating electric machine - Google Patents
Totally-enclosed-type rotating electric machine Download PDFInfo
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- CN109217564A CN109217564A CN201810710898.XA CN201810710898A CN109217564A CN 109217564 A CN109217564 A CN 109217564A CN 201810710898 A CN201810710898 A CN 201810710898A CN 109217564 A CN109217564 A CN 109217564A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/08—Arrangements for cooling or ventilating by gaseous cooling medium circulating wholly within the machine casing
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Motor Or Generator Frames (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Abstract
A kind of Totally-enclosed-type rotating electric machine, inhibit the Totally-enclosed-type rotating electric machine for having cooling tube group because toll bar is vortexed, vibration, noise caused by the resonance of air column.It has: rotor (11)；Stator (12)；Multiple cooling tubes (21) extend parallel to each other arrangement and pass through inside for external cooling medium；Shell (22), storage rotor core (14), stator and multiple cooling tubes, armature spindle (13) penetrate through the shell, which forms the confined space of storage internal gas；Internal fan (25,26), armature spindle is fixed in shell, recycles internal gas in confined space, generates the flowing of the internal gas flowed along the direction vertical with the direction that cooling tube extends in the outside of cooling tube；And mesh (31), the downstream side in the direction of the flowing of the internal gas in the outside of cooling tube is configured in confined space, the generation for inhibiting the toll bar because of caused by cooling tube to be vortexed.
Description
Technical field
The present invention relates to the Totally-enclosed-type rotating electric machines for having cooling tube group.
Background technique
In Totally-enclosed-type rotating electric machine, it is known to following construction: in order to prevent because being damaged due to Joule heat, along with machinery
The intracorporal overheat of shell caused by the fever of mistake, in shell configure cooling tube group, in each cooling tube flow outside air or
Person's cooling water cools down the internal gas (gas in shell) (referring to patent document 1,2) on the outside of cooling tube.In this case, lead to
Often make internal gas circulation using internal fan, thus makes the internal gas flow on the outside of cooling tube and realize cooling promotion.
Patent document 1: Japanese Unexamined Patent Publication 2016-123233 bulletin
Patent document 2: Japanese Unexamined Patent Publication 2014-166061 bulletin
Patent document 3: Japanese Unexamined Patent Publication 6-174390 bulletin
Due to the internal gas flow in the outside of cooling tube group, karman vortex is generated in the downstream side in the outside of cooling tube group
Rotation, may excitation device vibration or generate noise.Further, since the inside in the outside of the cooling cooling tube group of cooling tube group
Gas, it is also possible to vibration, noise because of caused by the resonance of air column can be generated.
In addition, Patent Document 3 discloses following technologies: in order to inhibit the toll bar because generating in heat-transfer pipe wake flow to be vortexed
And air column resonance sound is generated in the mode of the flow direction of extratubal fluid, gold is configured in a manner of the flowing for crossing extratubal fluid
Belong to silk screen eye.But technology disclosed Patent Document 3 assumes to heat extratubal fluid using the multi tube heat exchanger of boiler etc.
The case where, and do not assume the situation that extratubal fluid is cooled down by heat-transfer pipe.In turn, do not assume to have to rotating electric machine cold
But the application of device.
Summary of the invention
The present invention is to complete in light of this situation, the Totally-enclosed-type rotation that its object is to inhibit to have cooling tube group
The vibration, noise because caused by being vortexed toll bar of motor.
In order to solve the above problems, Totally-enclosed-type rotating electric machine according to the present invention is characterized in that having: rotor,
With the armature spindle for being supported to rotate and it is fixed on the rotor core of above-mentioned armature spindle；Stator was configured to along week
To the above-mentioned rotor core of encirclement；Multiple cooling tubes extend parallel to each other arrangement, are configured to pass through for external cooling medium interior
Portion；Shell stores above-mentioned rotor core, said stator and above-mentioned multiple cooling tubes, and above-mentioned armature spindle penetrates through the shell, at this
The inside of shell forms the confined space of storage internal gas；Internal fan is fixed on above-mentioned armature spindle in above-mentioned shell, makes
Above-mentioned internal gas recycles in above-mentioned confined space, generates along the direction vertical with the direction of above-mentioned multiple cooling tubes extensions
In the flowing for the above-mentioned internal gas that the outside of above-mentioned cooling tube is flowed；And mesh, it is configured in above-mentioned confined space
The downstream side in the direction of the flowing of the above-mentioned internal gas in the outside of multiple cooling tubes is stated, inhibition is drawn because of above-mentioned multiple cooling tubes
The generation that the toll bar risen is vortexed.
Invention effect
In accordance with the invention it is possible to inhibit the Totally-enclosed-type rotating electric machine for having cooling tube group because toll bar be vortexed caused by
Vibration, noise.
Detailed description of the invention
Fig. 1 is the schematic perpendicular cross-sectional view of Totally-enclosed-type rotating electric machine involved in the 1st embodiment of the invention.
Fig. 2 is that the II-II line of Fig. 1 erects cross-sectional view to view part.
Fig. 3 is the figure for showing the mesh of Fig. 1, and be Fig. 1 III-III line to view partial top view.
Fig. 4 is the figure for showing the mesh of Totally-enclosed-type rotating electric machine involved in the 2nd embodiment of the invention, and be with
The comparable partial top view of Fig. 3.
Fig. 5 is the figure for showing the mesh of Totally-enclosed-type rotating electric machine involved in the 3rd embodiment of the invention, and be with
The comparable partial top view of Fig. 3.
Fig. 6 is the figure for showing the mesh of Totally-enclosed-type rotating electric machine involved in the 4th embodiment of the invention, and be with
The comparable partial top view of Fig. 3.
Fig. 7 is the schematic perpendicular cross-sectional view of Totally-enclosed-type rotating electric machine involved in the 5th embodiment of the invention.
Fig. 8 is the schematic perpendicular cross-sectional view of Totally-enclosed-type rotating electric machine involved in the 6th embodiment of the invention.
Description of symbols:
11: rotor；12: stator；13: armature spindle；14: rotor core；15,16: bearing；20: cooler；21: cooling tube；
22: shell；23: external fan；24: external fan cover；25,26: internal fan；27: directing plate；28: gas riser portions；29；
30: gas falling portion；31,31a, 31b: mesh；32: upper space；40,41,45,47: mesh component；46: through hole.
Specific embodiment
Hereinafter, being illustrated referring to embodiment of the attached drawing to Totally-enclosed-type rotating electric machine according to the present invention.Herein,
Common label is marked to part common each other, and omits repeated explanation.
[the 1st embodiment]
Fig. 1 is the schematic perpendicular cross-sectional view of Totally-enclosed-type rotating electric machine involved in the 1st embodiment of the invention.Fig. 2
It is the II-II line of Fig. 1 to the perpendicular cross-sectional view in view part.Fig. 3 is the figure for showing the mesh of Fig. 1, and is the III-III line of Fig. 1 to view
Partial top view.
Totally-enclosed-type rotating electric machine involved in 1st embodiment has rotor 11 and is configured to surround rotor 11
The cylindric stator 12 of radial outside.Rotor 11 has the armature spindle 13 extended along horizontal direction and is fixed on rotor
The cylindric rotor core 14 of the radial outside of axis 13.Clip rotor core 14 in the axial direction and configure there are two bearing 15,
16, armature spindle 13 can be rotated by two bearings of bearing 15,16.
Cooler 20 is configured in the top of stator 12.Cooler 20 is multiple including arranging in parallel to each other in the axial direction
Cooling tube 21.Stator 12, rotor core 14, the configuration of cooler 20 are in shell 22.Armature spindle 13 penetrates through shell 22 and extends.It is more
Outer openings of the respective both ends of a cooling tube 21 towards shell 22.It is confined space in shell 22.
In the axial outside of a side of shell 22, external fan 23 is fixed on armature spindle 13.External fan cover 24 is matched
It is set to and adjacently covers external fan 23 with shell 22.It is configured to the outside air driven by external fan 23 in external fan guard
It is guided in 24, is passed through from the end of a side to the end of another party and in the axial direction with external fan cover 24 in cooling tube 21
Opposite side discharges towards the outside.In Fig. 1, the flowing of outside air is indicated with dotted arrow A.
In shell 22, the position of rotor core 14 is clipped in the axial direction, and two internal fans 25,26 are fixed on armature spindle
13.In shell 22 and for the space configuration in outside of cooling tube 21 there is directing plate 27, as a result, the cooling tube 21 in shell 22
The space in outside is divided into the gas riser portions 28 in axial center, clips the gas falling portion of gas riser portions 28 in the axial direction
29、30。
Top in shell 22 and for cooling tube 21 is in a manner of the upper end of blanketing gas riser portions 28 configured with level
The mesh 31 of extension.Top in shell 22 and for mesh 31 and cooling tube 21 is formed with upper space 32.
The rotation of internal fan 25,26 caused by rotation by armature spindle 13, gas (the internal gas in shell 22
Body, such as air) it is recycled in shell 22 as shown in the solid arrow B of Fig. 1.That is, internal gas is from internal fan 25,26
It is transported to the inside and its periphery of rotor core 14 and stator 12, rotor core 14 and stator 12 are cooled down.As a result,
Internal gas heating, rises in gas riser portions 28, external empty in cooled pipe 21 when passing through the outside of cooling tube 21
Air cooling.The further up stream of mesh 31 is passed through by the internal gas in the outside of cooling tube 21 in gas riser portions 28
Enter upper space 32.
Internal gas switchs to sinking from upper space 32, passes through the outside of cooling tube 21 in gas falling portion 29,30,
Herein, also cooled pipe 21 is cooling for internal gas.The internal gas come out from gas falling portion 29,30 returns to internal fan
25,26.In addition, as described above, the direction of the flowing of internal gas switchs to decline from rising in upper space 32, therefore, on
Portion space 32 becomes the bending section of the flow path of internal gas.
In this embodiment, as shown in FIG. 2 and 3, mesh 31 is formed as along rotary axis direction i.e. cooling tube 21
Rodlike multiple axial mesh components 40 for extending of extending direction and extend along the direction vertical with axial mesh component 40
The cross one another structure of rodlike multiple lateral mesh components 41.In the example in the figures, it is uploaded in lateral mesh component 41
Axial mesh component 40 is set, they are combined by welding or being brazed.Axial mutual interval (spacing) p1 of mesh component 40
Preferably smaller than mutual interval (spacing) p2 of cooling tube 21.Downstream side between cooling tube 21 adjacent to each other as a result,
There are at least one axial mesh components 40 for position.
According to the embodiment, pass through net in the internal gas passed through between multiple cooling tubes 21 in gas riser portions 28
Eye 31 flows into upper space 32.Therefore, the toll bar generated when in gas riser portions 28 by between multiple cooling tubes 21 is vortexed
It is upset by mesh 31, thus the development for inhibiting toll bar to be vortexed.Thereby, it is possible to inhibit vibration, noise because caused by being vortexed toll bar.
In the above description, mesh 31 is set as loading axial mesh component 40 on lateral mesh component 41, but conduct
Variation can also be formed as the construction that lateral mesh component 41 is loaded on axial mesh component 40.As another variation,
It can also be formed as the structure that axial mesh component 40 is easy flexure with lateral mesh component 41 respectively, and be that they mutually weave
Construction together.
[the 2nd embodiment]
Fig. 4 is the figure for showing the mesh of Totally-enclosed-type rotating electric machine involved in the 2nd embodiment of the invention, and be with
The comparable partial top view of Fig. 3 of 1st embodiment.
In the 2nd embodiment, each mesh component 45 of mesh 31 is constituted relative to rotary axis direction, that is, cooling tube 21
Extending direction at about 45 degree of angle, intersect.Other structures are identical as the 1st embodiment.
In this embodiment, the toll bar generated when in gas riser portions 28 by between multiple cooling tubes 21 is vortexed
It is upset by mesh 31, thus the development for inhibiting toll bar to be vortexed.Thereby, it is possible to inhibit vibration, noise because caused by being vortexed toll bar.
[the 3rd embodiment]
Fig. 5 is the figure for showing the mesh of Totally-enclosed-type rotating electric machine involved in the 3rd embodiment of the invention, and be with
The comparable partial top view of Fig. 3 of 1st embodiment.
In the 3rd embodiment, the mesh component 47 for constituting mesh 31 is formed as cellular mesh.Others knot
Structure is identical as the 1st embodiment.
In this embodiment, the toll bar generated when in gas riser portions 28 by between multiple cooling tubes 21 is vortexed
It is upset by mesh 31, thus the development for inhibiting toll bar to be vortexed.Thereby, it is possible to inhibit vibration, noise because caused by being vortexed toll bar.
[the 4th embodiment]
Fig. 6 is the figure for showing the mesh of Totally-enclosed-type rotating electric machine involved in the 4th embodiment of the invention, and be with
The comparable partial top view of Fig. 3 of 1st embodiment.
In the 4th embodiment, mesh 31 is the tabular for being provided with multiple through holes 46.In the example in the figures,
Each through hole 46 is circle in approximate same size, in pros on the extending direction of cooling tube 21 and perpendicular direction
Clathrate equally spaced arranges.Other structures are identical as the 1st embodiment.
In this embodiment, the toll bar generated when in gas riser portions 28 by between multiple cooling tubes 21 is vortexed
It is upset by mesh 31, thus the development for inhibiting toll bar to be vortexed.Thereby, it is possible to inhibit vibration, noise because caused by being vortexed toll bar.
In addition, the variation as the 4th embodiment, the shape of each through hole 46 than circular, be can also be
The others shape such as ellipse.In addition, the shape of each through hole 46, size can also be inconsistent.In turn, the arrangement side of through hole 46
Formula is not limited to square lattice shape, is also possible to oblique clathrate or irregular arrangement.
[the 5th embodiment]
Fig. 7 is the schematic perpendicular cross-sectional view of Totally-enclosed-type rotating electric machine involved in the 5th embodiment of the invention.
5th embodiment is the deformation of the 1st embodiment, with the upper of cooling tube 21 of the not only mesh 31 in shell 22
The upper end of square blanketing gas riser portions 28, and the mode horizontal extension of the upper end of mesh 31a blanketing gas falling portion 29,30
Configuration.Mesh 31, the construction of 31a are for example identical as the mesh 31 of the 1st embodiment (Fig. 2, Fig. 3).Other structures are also with the 1st
Embodiment is identical.
It is logical having passed through the internal gas between multiple cooling tubes 21 in gas riser portions 28 according to the 5th embodiment
It crosses mesh 31 and flows into upper space 32.Therefore, the toll bar generated when in gas riser portions 28 by between multiple cooling tubes 21
Vortex is upset by mesh 31, the development for thus toll bar being inhibited to be vortexed.In turn, from 32 inflow gas falling portion 29,30 of upper space
When pass through mesh 31a, therefore, can further suppress toll bar vortex influence.Thereby, it is possible to further suppress because toll bar is vortexed
Caused by vibration, noise.
In addition, in the above description, mesh 31, the construction of 31a are identical as the 1st embodiment, but the structure of mesh 31,31a
Making can also be identical as the the 2nd~the 4th embodiment (Fig. 4~Fig. 6).In addition, the construction of mesh 31 and mesh 31a can not also
Together.
[the 6th embodiment]
Fig. 8 is the schematic perpendicular cross-sectional view of Totally-enclosed-type rotating electric machine involved in the 5th embodiment of the invention.
6th embodiment is the deformation of the 1st embodiment, with the upper of cooling tube 21 of the not only mesh 31 in shell 22
The upper end of square blanketing gas riser portions 28, and mesh 31b is in the lower end of the lower part of gas falling portion 29,30 covering cooler 20
Mode horizontal extension configure.Mesh 31, the construction of 31b are for example identical as the mesh 31 of the 1st embodiment (Fig. 2, Fig. 3).
Other structures are also identical as the 1st embodiment.
It is logical having passed through the internal gas between multiple cooling tubes 21 in gas riser portions 28 according to the 6th embodiment
It crosses mesh 31 and flows into upper space 32.Therefore, the toll bar generated when in gas riser portions 28 by between multiple cooling tubes 21
Vortex is upset by mesh 31, thus the development for inhibiting toll bar to be vortexed.In turn, pass through multiple coolings in gas falling portion 29,30
Internal gas between pipe 21 passes through mesh 31b.Therefore, when passing through between multiple cooling tubes 21 in gas falling portion 29,30
The toll bar vortex of generation is upset by mesh 31b, thus the development for inhibiting toll bar to be vortexed.Thereby, it is possible to further suppress because of toll bar
Vibration, noise caused by vortex.
In addition, in the above description, mesh 31, the construction of 31b are identical as the 1st embodiment, but the structure of mesh 31,31b
Making can also be identical as the the 2nd~the 4th embodiment (Fig. 4~Fig. 6).In addition, the construction of mesh 31 and mesh 31b can not also
Together.
[other embodiments]
As mesh 31, the construction of 31a, 31b, other than the example of above-mentioned 1st~the 4th embodiment, such as can be with
It is the construction (illustration omitted) for being laid with steel wool (steel wool).In addition it is also possible to by multiple and the 1st~the 4th embodiment
Same type or different types of mesh 31 coincide with the upper and lower (illustration omitted).
As long as in addition, the net of the upper end of the mesh 31 of the upper end of setting gas riser portions 28, gas falling portion 29,30
Any of eye 31a, mesh 31b of lower part of gas falling portion 29,30, just can play toll bar vortex Emergence and Development
The effect of inhibition.In turn, if combining arbitrary two or three, effect can further be played.
In addition, in the above-described embodiment, outside air is flowed in cooling tube 21 to cool down internal gas, but can also be with
Instead of flowing outside air, then be formed as the construction that cooling water is flowed in cooling tube 21.
In addition, in the above-described embodiment, rotary shaft is horizontal direction, but rotary shaft may not be horizontal direction, example
, also can be using the present invention if even if rotary shaft is vertical direction.
In addition, in the above-described embodiment, internal fan 25,26 is two, but internal fan may also be only one.
Embodiments of the present invention are illustrated above, but the embodiment is shown as an example, is not intended to
The range of invention is defined.The embodiment can be implemented in such a way that others are various, not depart from invention
Various omissions, displacement, change are able to carry out in the range of purport.These embodiments and modifications thereof be contained in invention range and
In purport, and it is contained in invention and the range being equal with it documented by technical solution.
Claims (9)
1. a kind of Totally-enclosed-type rotating electric machine, which is characterized in that have:
Rotor has and is supported to the armature spindle that can be rotated and the rotor core for being fixed on above-mentioned armature spindle；
Stator is configured to circumferentially surround above-mentioned rotor core；
Multiple cooling tubes extend parallel to each other arrangement, are configured to pass through inside for external cooling medium；
Shell stores above-mentioned rotor core, said stator and above-mentioned multiple cooling tubes, above-mentioned armature spindle and penetrates through the shell,
The inside of the shell forms the confined space of storage internal gas；
Internal fan is fixed on above-mentioned armature spindle in above-mentioned shell, recycles above-mentioned internal gas in above-mentioned confined space,
Generate the above-mentioned inside flowed along the vertical direction in the direction extended with above-mentioned multiple cooling tubes in the outside of above-mentioned cooling tube
The flowing of gas；And
Mesh is configured at the direction of the flowing of the above-mentioned internal gas in the outside of above-mentioned multiple cooling tubes in above-mentioned confined space
Downstream side, inhibit because of caused by above-mentioned multiple cooling tubes toll bar be vortexed generation.
2. Totally-enclosed-type rotating electric machine as described in claim 1, which is characterized in that
Also there is the directing plate for the flowing for guiding above-mentioned internal gas in above-mentioned shell.
3. Totally-enclosed-type rotating electric machine as claimed in claim 2, which is characterized in that
The flow path of the above-mentioned intracorporal above-mentioned internal gas of shell has bending section, in the upstream side and downstream side for clipping above-mentioned bending section
The flow path being formed through around above-mentioned multiple cooling tubes,
Above-mentioned mesh is configured at the downstream side of multiple cooling tubes of above-mentioned upstream side in the upstream side of above-mentioned bending section.
4. Totally-enclosed-type rotating electric machine as claimed in claim 2 or claim 3, which is characterized in that
The flow path of the above-mentioned intracorporal above-mentioned internal gas of shell has bending section, in the upstream side and downstream side for clipping above-mentioned bending section
The flow path being formed through around above-mentioned multiple cooling tubes,
Above-mentioned mesh is configured at the downstream side of multiple cooling tubes in the downstream side of above-mentioned bending section.
5. Totally-enclosed-type rotating electric machine according to any one of claims 1 to 4, which is characterized in that
Above-mentioned mesh has multiple mesh components, and multiple mesh member array is divided in the downstream side of above-mentioned multiple cooling tubes
Between cooling tube adjacent to each other in above-mentioned multiple cooling tubes.
6. the Totally-enclosed-type rotating electric machine as described in any one of claims 1 to 5, which is characterized in that
Above-mentioned mesh has multiple mesh components, and multiple mesh component is separated than adjacent to each other in above-mentioned multiple cooling tubes
The cooling tube narrow interval in mutual interval and arrange.
7. such as Totally-enclosed-type rotating electric machine described in any one of claims 1 to 6, which is characterized in that
Above-mentioned mesh, which has, to intersect and clathrate multiple mesh components.
8. the Totally-enclosed-type rotating electric machine as described in any one of claims 1 to 7, which is characterized in that
Above-mentioned mesh, which has, is formed as cellular mesh component.
9. such as Totally-enclosed-type rotating electric machine described in any item of the claim 1 to 8, which is characterized in that
Above-mentioned mesh has the mesh component for the plate for being formed with multiple through holes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017130289A JP2019017126A (en) | 2017-07-03 | 2017-07-03 | Fully closed dynamo-electric machine |
| JP2017-130289 | 2017-07-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109217564A true CN109217564A (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810710898.XA Pending CN109217564A (en) | 2017-07-03 | 2018-07-03 | Totally-enclosed-type rotating electric machine |
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| JP (1) | JP2019017126A (en) |
| CN (1) | CN109217564A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220097657A1 (en) | 2019-02-01 | 2022-03-31 | Koito Manufacturing Co., Ltd. | Cleaner for vehicles, bracket for cleaners for vehicles, and cleaner unit for vehicles |
| JP2020191711A (en) * | 2019-05-20 | 2020-11-26 | 株式会社マキタ | Blower |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51156403U (en) * | 1975-06-09 | 1976-12-13 | ||
| JPS6198366U (en) * | 1984-12-04 | 1986-06-24 | ||
| JPH06174390A (en) * | 1992-12-07 | 1994-06-24 | Mitsubishi Heavy Ind Ltd | Multitube type heat exchanger |
| JP2015137639A (en) * | 2014-01-24 | 2015-07-30 | 株式会社日立産機システム | Muffler of air ventilation portion and compressor having the muffler |
-
2017
- 2017-07-03 JP JP2017130289A patent/JP2019017126A/en active Pending
-
2018
- 2018-07-03 CN CN201810710898.XA patent/CN109217564A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51156403U (en) * | 1975-06-09 | 1976-12-13 | ||
| JPS6198366U (en) * | 1984-12-04 | 1986-06-24 | ||
| JPH06174390A (en) * | 1992-12-07 | 1994-06-24 | Mitsubishi Heavy Ind Ltd | Multitube type heat exchanger |
| JP2015137639A (en) * | 2014-01-24 | 2015-07-30 | 株式会社日立産機システム | Muffler of air ventilation portion and compressor having the muffler |
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| Publication number | Publication date |
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| JP2019017126A (en) | 2019-01-31 |
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Application publication date: 20190115 |