CN104847536A - EGR cooler - Google Patents
EGR cooler Download PDFInfo
- Publication number
- CN104847536A CN104847536A CN201410069296.2A CN201410069296A CN104847536A CN 104847536 A CN104847536 A CN 104847536A CN 201410069296 A CN201410069296 A CN 201410069296A CN 104847536 A CN104847536 A CN 104847536A
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- China
- Prior art keywords
- cooling liquid
- cooler
- cooling
- exhaust gas
- egr
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention discloses an EGR cooler. The EGR cooler comprises a cooler shell for defining a cooling cavity and accommodating cooling liquid, and an EGR cooling pipe for transmitting EGR gas required to be cooled, wherein at least one part of the EGR cooling pipe extends in the cooling cavity to exchange heat with the cooling liquid in the cooling cavity; the cooler shell has a cooling liquid inlet and a cooling liquid outlet; the cooling liquid inlet is used for transporting the cooling liquid into the cooling cavity; and the cooling liquid outlet is used for transporting the cooling liquid outside the cooling cavity. The EGR cooler further comprises a flowing section adjusting device; and the flowing section adjusting device is positioned at the cooling liquid inlet side or the cooling liquid outlet side for adjusting the flow of the cooling liquid flowing through the cooling cavity. The EGR cooler has an adjustable flowing section to adjust the flow of the cooling liquid through adjusting the flowing section of the cooling liquid, so that the preferable adjustment of the EGR gas temperature is realized, and the reduction of theoxynitride emission of an engine is facilitated.
Description
Technical field
The present invention relates to automobile technical field, particularly relate to a kind of cooler for recycled exhaust gas.
Background technique
EGR refers to EGR, is the abbreviation of English Exhaust Gas Recirculation, specifically refers to that a part for waste gas diesel engine or petrol engine produced sends cylinder back to again.This portion is called EGR gas or EGR gas.EGR gas can delay the combustion process of fuel in cylinder owing to having inertia, that is the velocity of combustion of fuel will slow down because of EGR gas, thus cause the pressure initiation process in firing chamber to slow down, and then the oxynitrides produced is caused to reduce.
In order to be conducive to reducing oxynitrides, wish that EGR gas can be input in cylinder with suitable temperature.Namely the Main Function of cooler for recycled exhaust gas is to cool by cooling liquid the waste gas participating in recycle burning, the exhaust gas temperature entering cylinder is reduced, thus effectively reduces the oxynitride discharge of motor.
In the prior art, cooler for recycled exhaust gas cools EGR gas with fixing coolant rate, is difficult to EGR gas cooling to suitable temperature range.
Therefore a kind of cooler for recycled exhaust gas is wished to overcome or at least alleviates the above-mentioned defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of cooler for recycled exhaust gas to overcome or at least alleviate the above-mentioned defect of prior art.
For achieving the above object, the invention provides a kind of cooler for recycled exhaust gas, described cooler for recycled exhaust gas comprises:
Cooler casing, it limits a cooling chamber, for holding cooling liquid; And
EGR cooling tube, for carrying the EGR gas that need cool, described EGR cooling tube extends at least in part in described cooling chamber, to carry out heat exchange with the cooling liquid in described cooling chamber,
Wherein, described cooler casing has cooling liquid entrance and cooling liquid outlet, and described cooling liquid entrance is used for cooling liquid to be delivered in described cooling chamber, and described cooling liquid outlet is used for described cooling liquid to export to outside described cooling chamber,
Described cooler for recycled exhaust gas comprises flow area controlling device further, and described flow area controlling device is positioned at described cooling liquid inlet side or cooling liquid outlet side, for regulating the flow of the cooling liquid flowing through described cooling chamber.
Preferably, described flow area controlling device is positioned at described cooling liquid ingress or cooling liquid outlet place.
Preferably, described flow area controlling device comprises valve block, and described valve block is arranged to rotate around an axis, and regulates the flow area (effective flow cross-section areas or minimum flow cross-section areas) at described cooling liquid ingress or cooling liquid outlet place.
Preferably, described flow area controlling device comprises spool, described spool is arranged on described cooling liquid ingress or cooling liquid outlet place, and relative to described cooling liquid entrance or cooling liquid outlet motion, and the flow area (effective flow cross-section areas or minimum flow cross-section areas) at described cooling liquid ingress or cooling liquid outlet place can be regulated.
Preferably, the shape of described spool is taper type.
Preferably, described cooler for recycled exhaust gas comprises motor further, drives described flow area controlling device and regulates the flow of the cooling liquid flowing through described cooling chamber.
Preferably, described motor is stepper motor.
Preferably, described cooler for recycled exhaust gas comprises EGR temperature transducer and control unit further, the temperature of described EGR temperature sensor measurement EGR gas, and temperature signal is delivered to described control unit, described control unit controls described stepper motor work based on described temperature signal, is regulated the flow of the cooling liquid flowing through described cooling chamber by flow area controlling device described in driving stepper motor.
Preferably, described cooler casing is cylindric, described EGR cooling tube is pipe, and the axis being parallel of described EGR cooling tube is in the axis of described cooling chamber, the dead in line of the entrance connecting tube of described cooling liquid ingress and the outlet connecting pipe at cooling liquid outlet place, and be vertically intersected on the axis of described cooling chamber.
Preferably, described cooler for recycled exhaust gas comprises entrance coupling piece further, and described entrance coupling piece is arranged between entrance connecting tube and described cooling chamber, and its cross section is fan-shaped, and sector open side is towards described cooling chamber.
Cooler for recycled exhaust gas of the present invention has adjustable flow area, thus can by the flow regulating effective flow area of cooler for recycled exhaust gas to regulate cooling liquid, and then the better adjustment realized EGR gas temperature, thus be conducive to the oxynitride discharge reducing motor.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of cooler for recycled exhaust gas according to a first embodiment of the present invention.
Fig. 2 is the schematic diagram of cooler for recycled exhaust gas according to a second embodiment of the present invention.
Fig. 3 is the control principle schematic diagram of cooler for recycled exhaust gas according to a third embodiment of the present invention.
Reference character:
| 1 | Cooler casing | 9 | Stepper motor |
| 2 | EGR cooling tube | 10 | Flow area controlling device |
| 3 | Entrance connecting tube | 11 | Cooler casing |
| 4 | Outlet connecting pipe | 12 | EGR cooling tube |
| 5 | Valve block | 13 | Entrance connecting tube |
| 6 | Entrance coupling piece | 14 | Outlet connecting pipe |
| 7 | EGR temperature transducer | 15 | Spool |
| 8 | Control unit |
Embodiment
For making object of the invention process, technological scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention; it will be appreciated that; term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limiting the scope of the invention.
Cooler casing and EGR cooling tube is comprised according to the cooler for recycled exhaust gas of the present invention one broad embodiment.Cooler casing limits a cooling chamber, for holding cooling liquid.EGR cooling tube is for carrying the EGR gas that need cool.Described EGR cooling tube extends at least in part in described cooling chamber, to carry out heat exchange with the cooling liquid in described cooling chamber.Cooler casing has cooling liquid entrance and cooling liquid outlet, and described cooling liquid entrance is used for cooling liquid to be delivered in described cooling chamber, and described cooling liquid outlet is used for described cooling liquid to export to outside described cooling chamber.Described cooler for recycled exhaust gas comprises flow area controlling device further, described flow area controlling device is positioned at described cooling liquid inlet side or cooling liquid outlet side, for regulating the flow of the cooling liquid flowing through described cooling chamber (regulating the flow of the cooling liquid flowing through described cooling chamber by regulating the effective flow area on stream).
By arranging flow area controlling device, above-mentioned broad embodiment cooler for recycled exhaust gas there is adjustable flow area, thus can by the flow regulating effective flow area (the minimum flow area namely on whole stream) of cooler for recycled exhaust gas to regulate cooling liquid, and then the better adjustment realized EGR gas temperature, thus be conducive to the oxynitride discharge reducing motor.
Fig. 1 is the schematic diagram of cooler for recycled exhaust gas according to a first embodiment of the present invention.Fig. 2 is the schematic diagram of cooler for recycled exhaust gas according to a second embodiment of the present invention.Fig. 3 is the control principle schematic diagram of cooler for recycled exhaust gas according to a third embodiment of the present invention.
Cooler for recycled exhaust gas shown in Fig. 1 comprises cooler casing 1, EGR cooling tube 2, entrance connecting tube 3, outlet connecting pipe 4, valve block 5 and entrance coupling piece 6.
Cooler casing 1 limits a cooling chamber, for holding cooling liquid.As shown in Figure 1, the cross section of the cooling chamber of cooler casing 1 is circular, and that is, cooler casing is substantially cylindrical shape, and its cooling chamber is substantially cylindric.It is pointed out that cooler casing can adopt any suitable shape.
Cooler casing has cooling liquid entrance at the downside place of Fig. 1, and cooling liquid entrance is used for the cooling liquid of lower temperature to be delivered in described cooling chamber.Cooler casing has cooling liquid outlet at the upside place of Fig. 1, and cooling liquid outlet is used for described cooling liquid to export to outside described cooling chamber, and now cooling liquid absorbs the heat of EGR cooling tube 2 and interior EGR gas thereof, and temperature raises to some extent.
The cooling liquid inlet side (downside in Fig. 1) of cooler casing is provided with entrance connecting tube 3, cooling liquid outlet side (upside in Fig. 1) is provided with outlet connecting pipe 4.Advantageously, entrance connecting tube 3 and outlet connecting pipe 4 are round straight tube.Such as, but be understandable that, entrance connecting tube 3 and outlet connecting pipe 4 can be other shapes, can be square tubular, can grade with round part.
In the illustrated embodiment, entrance connecting tube 3 and outlet connecting pipe 4 are circle straight tube.The dead in line of entrance connecting tube 3 and outlet connecting pipe 4, and the axis being vertically intersected on described cooling chamber.This is conducive to the heat exchange of cooling liquid and EGR cooling tube 2 and interior EGR gas thereof.
See Fig. 1, many EGR cooling tubes 2 are through cooler casing 1.In the embodiment shown in fig. 1, many EGR cooling tubes 2 are circumferentially uniform on the cross section of cooler casing 1, and every root EGR cooling tube 2 is circle straight tube, and the axis being parallel of EGR cooling tube 2, in the axis of cooling chamber, is on the direction of vertical drawing in FIG.Be understandable that, the present invention is not limited thereto kind of a structure.Such as, in a not shown embodiment, EGR cooling tube is single pipe, snakelike setting in the cooling chamber of cooler casing.
Valve block 5 is arranged on cooling liquid ingress, as flow area controlling device.Be understandable that, the position of valve block 5 is not limited to illustrated embodiment.Valve block 5 both can be arranged on cooling liquid inlet side, also can be arranged on cooling liquid outlet side; Both can be arranged on cooling liquid entrance or cooling liquid outlet place, also can be arranged in entrance connecting tube 3 or outlet connecting pipe 4.As long as the flow of the cooling liquid flowing through described cooling chamber can be regulated.And flow area controlling device is also not limited to illustrated valve structure, such as, can adopt the valve core structure shown in Fig. 2.
See Fig. 1, entrance coupling piece 6 is arranged between entrance connecting tube and described cooling chamber.The cross section of entrance coupling piece 6 is roughly fan-shaped, and sector open side is towards described cooling chamber.Entrance coupling piece 6 can optimize water flow field, and guarantees that the rotation of valve block 5 has sufficient space.Be understandable that, outlet coupling piece can also be set between outlet connecting pipe and described cooling chamber.Advantageously, arranging position inlet porting coupling piece or the outlet coupling piece of valve block, optimizing water flow field, and being beneficial to the rotation of valve block.
The driving of valve block 5 can be adopted in any suitable manner.Such as, can by operator's hand drive (Joystick by exposing); Or drive with electronic or hydraulic way.Show a kind of mode of motorized motions in the embodiments of figure 3.
Cooler for recycled exhaust gas shown in Fig. 2 comprises cooler casing 11, EGR cooling tube 12, entrance connecting tube 13, outlet connecting pipe 14 and spool 15.
The cross section of the cooling chamber that cooler casing 11 limits is square, and that is, cooler casing 11 is substantially square tube shape, and its cooling chamber is substantially square, as required, and can at edge rounding.It is pointed out that cooler casing can adopt any suitable shape.The non-inlet porting coupling piece of cooler for recycled exhaust gas shown in Fig. 2 and outlet coupling piece.Advantageously, for square cooling chamber, at entrance and exit, place all arranges coupling piece, to optimize water flow field.
The cooling liquid entrance of cooler casing 11 at downside place is used for the cooling liquid of lower temperature to be delivered in described cooling chamber.The cooling liquid outlet of cooler casing 11 at upside place is used for described cooling liquid to export to outside described cooling chamber, and now cooling liquid absorbs the heat of EGR cooling tube 12 and interior EGR gas thereof, and temperature raises to some extent.
The cooling liquid inlet side of cooler casing 11 is provided with entrance connecting tube 13, cooling liquid outlet side is provided with outlet connecting pipe 14.Entrance connecting tube 13 and outlet connecting pipe 14 are square straight tube.The central axis (i.e. center line) of entrance connecting tube 13 and outlet connecting pipe 14 overlaps, and is vertically intersected on the central axis (i.e. center line) of described cooling chamber.This is conducive to the heat exchange of cooling liquid and EGR cooling tube 12 and interior EGR gas thereof.
See Fig. 2, many EGR cooling tubes 12 are through cooler casing 11.In the embodiment shown in Figure 2, many EGR cooling tubes 12 become determinant array distribution on the cross section of cooler casing 11, and every root EGR cooling tube 2 side of being straight tube, the centerline axis parallel of EGR cooling tube 2, in the central axis of cooling chamber, is on the direction of vertical drawing in fig. 2.
Spool 15 is arranged on cooling liquid ingress, as flow area controlling device.Spool 15 is arranged to move relative to cooling liquid entrance, and regulates the flow area of described cooling liquid ingress, regulates the flow flowing through the cooling liquid of cooling chamber thus.Be understandable that, in fig. 2, cooling liquid entrance and entrance connecting tube 13 and cooling chamber connection, cooling liquid outlet and outlet connecting pipe 14 and cooling chamber connection.It is pointed out that the position of spool 15 is not limited to illustrated embodiment.Spool 15 both can be arranged on cooling liquid inlet side, also can be arranged on cooling liquid outlet side; Both can be arranged on cooling liquid entrance or cooling liquid outlet place, also can be arranged in entrance connecting tube 13 or outlet connecting pipe 14.As long as the flow of the cooling liquid flowing through described cooling chamber can be regulated.The shape of illustrated spool 11 is taper type.But be understandable that, the shape of spool is not limited to illustrated shape, as long as can close with the matching form of periphery, by motor adjustment flow area.
Fig. 3 is the control principle schematic diagram of cooler for recycled exhaust gas according to a third embodiment of the present invention.The component such as cooler casing, EGR cooling tube is not shown in the embodiment shown in Fig. 3, illustrate only the framework relevant to control principle.Specifically, EGR temperature transducer 7, control unit 8, stepper motor 9 and flow area controlling device 10 have been shown in Fig. 3.
Temperature signal for measuring the temperature of EGR gas, and is delivered to the control unit 8 be attached thereto by EGR temperature transducer 10.EGR temperature transducer 10 can adopt the temperature transducer of any suitable type, such as, and thermocouple temperature sensor, bimetallic temperature sensor, thermistor temperature sensor etc.The temperature detection loca of EGR temperature transducer 10 also can be arranged as required, advantageously, detects the temperature being about to the waste gas (EGR gas) being transported to cylinder.
Control unit 10 is electrically connected with EGR temperature transducer 7 and stepper motor 9.Control unit 10 receives the temperature signal from EGR temperature transducer 7, and control step motor 10 moves based on described temperature signal.There is provided driving force by stepper motor to flow area controlling device 10, drive flow area controlling device 10, and regulate the flow flowing through the cooling liquid of described cooling chamber.Such as, the specific implementation form of flow area controlling device 10 can be the valve block 5 shown in Fig. 1 or the spool shown in Fig. 2 15.
Finally it is to be noted: above embodiment only in order to technological scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technological scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technological scheme.
Claims (10)
1. a cooler for recycled exhaust gas, is characterized in that, comprising:
Cooler casing, it limits a cooling chamber, for holding cooling liquid; And
EGR cooling tube, for carrying the EGR gas that need cool, described EGR cooling tube extends at least in part in described cooling chamber, to carry out heat exchange with the cooling liquid in described cooling chamber,
Wherein, described cooler casing has cooling liquid entrance and cooling liquid outlet, and described cooling liquid entrance is used for cooling liquid to be delivered in described cooling chamber, and described cooling liquid outlet is used for described cooling liquid to export to outside described cooling chamber,
Described cooler for recycled exhaust gas comprises flow area controlling device further, and described flow area controlling device is positioned at described cooling liquid inlet side or cooling liquid outlet side, for regulating the flow of the cooling liquid flowing through described cooling chamber.
2. cooler for recycled exhaust gas as claimed in claim 1, it is characterized in that, described flow area controlling device is positioned at described cooling liquid ingress or cooling liquid outlet place.
3. cooler for recycled exhaust gas as claimed in claim 2, it is characterized in that, described flow area controlling device comprises valve block, and described valve block is arranged to rotate around an axis, and regulates the flow area at described cooling liquid ingress or cooling liquid outlet place.
4. cooler for recycled exhaust gas as claimed in claim 2, it is characterized in that, described flow area controlling device comprises spool, described spool is arranged on described cooling liquid ingress or cooling liquid outlet place, and relative to described cooling liquid entrance or cooling liquid outlet motion, and the flow area at described cooling liquid ingress or cooling liquid outlet place can be regulated.
5. cooler for recycled exhaust gas as claimed in claim 4, it is characterized in that, the shape of described spool is taper type.
6. cooler for recycled exhaust gas as claimed in claim 1, it is characterized in that, described cooler for recycled exhaust gas comprises motor further to drive described flow area controlling device, to regulate the flow of the cooling liquid flowing through described cooling chamber.
7. cooler for recycled exhaust gas as claimed in claim 6, it is characterized in that, described motor is stepper motor.
8. cooler for recycled exhaust gas as claimed in claim 7, it is characterized in that, described cooler for recycled exhaust gas comprises EGR temperature transducer and control unit further, the temperature of described EGR temperature sensor measurement EGR gas, and temperature signal is delivered to described control unit, described control unit controls described stepper motor work based on described temperature signal, is regulated the flow of the cooling liquid flowing through described cooling chamber by flow area controlling device described in driving stepper motor.
9. cooler for recycled exhaust gas as claimed in claim 1, it is characterized in that, described cooler casing is cylindric, described EGR cooling tube is pipe, and the axis being parallel of described EGR cooling tube is in the axis of described cooling chamber, the dead in line of the entrance connecting tube of described cooling liquid ingress and the outlet connecting pipe at cooling liquid outlet place, and be vertically intersected on the axis of described cooling chamber.
10. cooler for recycled exhaust gas as claimed in claim 9, it is characterized in that, described cooler for recycled exhaust gas comprises entrance coupling piece further, and described entrance coupling piece is arranged between described entrance connecting tube and described cooling chamber, its cross section is fan-shaped, and sector open side is towards described cooling chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410069296.2A CN104847536A (en) | 2014-02-27 | 2014-02-27 | EGR cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410069296.2A CN104847536A (en) | 2014-02-27 | 2014-02-27 | EGR cooler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104847536A true CN104847536A (en) | 2015-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410069296.2A Pending CN104847536A (en) | 2014-02-27 | 2014-02-27 | EGR cooler |
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| Country | Link |
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| CN (1) | CN104847536A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113305475A (en) * | 2021-06-08 | 2021-08-27 | 湘潭大学 | Cold source device for welding |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982689A (en) * | 2005-12-13 | 2007-06-20 | 日产自动车株式会社 | Exhaust gas recirculation in diesel engine |
| US20100242929A1 (en) * | 2007-12-07 | 2010-09-30 | Zoltan Kardos | Arrangement and method for the return of exhaust gases in a combustion engine |
| CN102410089A (en) * | 2010-09-20 | 2012-04-11 | 广西玉柴机器股份有限公司 | EGR air inlet control system of light diesel engine |
| CN103485937A (en) * | 2013-08-30 | 2014-01-01 | 广西玉柴机器股份有限公司 | Engine EGR (Exhaust Gas Recirculation) system |
-
2014
- 2014-02-27 CN CN201410069296.2A patent/CN104847536A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982689A (en) * | 2005-12-13 | 2007-06-20 | 日产自动车株式会社 | Exhaust gas recirculation in diesel engine |
| US20100242929A1 (en) * | 2007-12-07 | 2010-09-30 | Zoltan Kardos | Arrangement and method for the return of exhaust gases in a combustion engine |
| CN102410089A (en) * | 2010-09-20 | 2012-04-11 | 广西玉柴机器股份有限公司 | EGR air inlet control system of light diesel engine |
| CN103485937A (en) * | 2013-08-30 | 2014-01-01 | 广西玉柴机器股份有限公司 | Engine EGR (Exhaust Gas Recirculation) system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113305475A (en) * | 2021-06-08 | 2021-08-27 | 湘潭大学 | Cold source device for welding |
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Application publication date: 20150819 |