CN1587652A - Screw groove heat radiation tube for diesel engine waste gas recirculation cooler - Google Patents
Screw groove heat radiation tube for diesel engine waste gas recirculation cooler Download PDFInfo
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- CN1587652A CN1587652A CNA2004100690499A CN200410069049A CN1587652A CN 1587652 A CN1587652 A CN 1587652A CN A2004100690499 A CNA2004100690499 A CN A2004100690499A CN 200410069049 A CN200410069049 A CN 200410069049A CN 1587652 A CN1587652 A CN 1587652A
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- stainless steel
- helical groove
- steel tube
- diesel engine
- heat dissipating
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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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Abstract
The invention relates to a kind of spiral beard cooling tube that is used in the exhaust gas recycling chiller of the diesel motor. It is incldues staniless steel pipe with smooth surface, on the outer wall of the stainless steel pipe there are two or three screw surrounding spiral beards along its axis, and on the surface of its inner wall there forms two or three spiral protruding arris. This invention is arranged in the exhaust gas recycled cooling machine used by exhaust gas recycling system of diesel motor, through pressing evenly multi screw surrounding spiral beards with the same intervals and spread rationally density on the outer surface of stainless steel pipe, it makes the exhaust gas in stainless steel pipe disperse heat efficiently, reduces the loss of gas pressure greatly, overcomes the defect and insufficiency of the former stainless steel pipe with single spiral beard effectively, and gets good practical applying results.
Description
Technical field
The present invention relates to a kind of heat dissipating pipe, especially a kind of helical groove heat dissipating pipe that is used for the diesel engine exhaust recycle cooler belongs to vehicle manufacturing and automotive exhaust gas control technique field.
Background technique
Along with the promulgation in succession of the relevant toxic emission control criterion of world developed country, decree, the serious day by day discharging waste gas pollution problem that widely used fuel engine brought in every field becomes the focus that people pay close attention to gradually.For reaching environmental requirement, taked the various control measure, the technology that cooler for recycled exhaust gas (Exhaust GasRecirculation Cooler) is installed in the vehicle exhaust circulatory system (EGR System) is exactly wherein a kind of.
Cooler for recycled exhaust gas (EGR Cooler) is the critical piece in the vehicle exhaust circulatory system (EGR System), and it can reduce the discharge amount (NOx Emissions) of motor oxynitrides under the situation of not damaging fuel economy.
Early stage cooler for recycled exhaust gas, inside are equipped with the level and smooth Stainless Steel Tube of numerous inner and outer surface (Plain Inner Gas Tubes); When the waste gas of engine emission passed through the level and smooth Stainless Steel Tube of this inner and outer surface, the heat of waste gas was shed.Because waste gas flowing state linearly in level and smooth Stainless Steel Tube, so its radiating efficiency is lower, and increases the quantity of level and smooth Stainless Steel Tube, though can increase heat exchange area, the volume that makes cooler more greatly, heavier, the cost of making and installing is higher.
The inner Stainless Steel Tube of installing of existing a kind of cooler with single helical groove, this helical groove is around on the outer surface that is pressed on Stainless Steel Tube, make and form spiral fin on the stainless steel inside pipe wall, when the waste gas of engine emission passes through this Stainless Steel Tube, spiral helicine fin makes the inner generation of air-flow disorderly, thereby has improved the heat exchange efficiency of Stainless Steel Tube.The incidental beneficial effect of spiral helicine fin is set is that turbulent flow makes particulate matter in the air-flow can't be deposited on the inner surface of Stainless Steel Tube, has guaranteed that Stainless Steel Tube has higher heat exchange efficiency for a long time.
Yet, this stainless steel heat dissipating pipe with single helical groove also exists certain deficiency, it shows mainly that along with the further strictness (as the enforcement of Euro V emissions) to fuel oil toxic emission requirement the radiating efficiency of Stainless Steel Tube needs further to improve.In theory, reduce the pitch of grooves of helical groove or increase the disorder that depth of groove can increase exhaust flow, thereby improve the efficient of heat exchange to a certain extent, but following problems may be encountered in actual applications: when reducing the pitch of grooves of helical groove, cause lead angle to reduce, make on the one hand the fin of stainless steel inside pipe wall that the resistance of the exhaust flow that passes through is obviously improved, make the exhaust gas pressure of flow through Stainless Steel Tube outlet and inlet balance phenomenon significantly occur, this is unallowed in the use of the cooler for recycled exhaust gas of diesel engine; The stress that reduces to strengthen Stainless Steel Tube of lead angle on the other hand, make the client in the process of carrying out stress relief by soldering, cause breaking of stainless steel tube position easily, for avoiding the generation of this situation, before assembling, need Stainless Steel Tube is carried out bright annealing, thereby increased cost of production.When adopting the increase depth of groove, the mean inside diameter of Stainless Steel Tube can reduce thereupon, and can increase too the resistance of exhaust flow, also causes the deposition of particulate matter on stainless steel inside pipe wall in the exhaust flow simultaneously easily, reduces radiating efficiency.
In sum, because at present employed level and smooth Stainless Steel Tube and Stainless Steel Tube with single helical groove all can't effectively further improve the cooling effect of cooler, therefore, how to go to satisfy the requirement of the waste gas emission standard of raising day by day, now become one of industry personage problem demanding prompt solution by the radiating efficiency that strengthens Stainless Steel Tube.
Summary of the invention
Technical problem to be solved by this invention is improving the helical groove heat dissipating pipe that existing deficiency provides a kind of diesel engine exhaust recycle cooler to use aspect the radiating efficiency at the Stainless Steel Tube that has single helical groove at present, this heat dissipating pipe is simple in structure, stress is little, resistance to exhaust flow is little, can not cause the deposition of particulate matter in the waste gas, have higher heat radiation, cooling effect.
Technical problem to be solved by this invention realizes by the following technical solutions:
The helical groove heat dissipating pipe that a kind of diesel engine exhaust recycle cooler is used, it comprises the Stainless Steel Tube of surface smoothing.Its axial direction spiral surrounding is pressed and is provided with two or three helical grooves in the outer wall upper edge of Stainless Steel Tube, and forms two or three spiral fins in the inner wall surface of Stainless Steel Tube.
Article two, the interval between the helical groove on the cross-sectional circumferential of Stainless Steel Tube each other at a distance of 180 ° of angles.Article three, the interval between the helical groove on the cross-sectional circumferential of Stainless Steel Tube each other at a distance of 120 °.The diameter of Stainless Steel Tube is 6mm-12mm, and wall thickness is 0.25mm-0.50mm.
Stainless Steel Tube can adopt gapless stainless steel tube, or the Stainless Steel Tube of welding fabrication.Article two, each other at a distance of the helical groove at 180 ° of angles, perhaps three arranging densities that can increase the Stainless Steel Tube upper groove each other at a distance of the helical groove of hexagonal angle make the turbulent flow aggravation of exhaust flow, and heat exchange is rapider, thereby has improved heat exchange efficiency greatly.Simultaneously, the pitch of each wall scroll helical groove has been compared very big increase with the present employed pitch that has the Stainless Steel Tube of a helical groove under the identical situation of adjacent grooves spacing, the resistance that the exhaust flow that passes through is held back is less, and stress also has obviously and reduces.
For making Stainless Steel Tube under the big as far as possible prerequisite of the generation area that guarantees turbulent flow, reduce the resistance of the interior fin of pipe simultaneously to exhaust flow as far as possible, by theoretical calculation and experiment, pitch of grooves on can Stainless Steel Tube between the adjacent helical groove is set to 6mm-12mm, and the degree of depth of helical groove is set to 0.4mm-1.0mm.
The shape of cross section of helical groove can be " V " shape or " U " shape.Here so-called " V " shape or " U " shape are the similar shapes of " V " shape or " U " shape.The bottom width of " V " connected in star is not more than 0.5mm; The bottom width of " U " connected in star is not less than 0.5mm.
Be not difficult to find out by above technological scheme, the present invention is installed in the cooler for recycled exhaust gas of diesel engine exhaust circulatory system use, when cooler is worked, heat dissipating pipe in the cooler is because its inwall is evenly pressed the identical and rational helical groove of establishing of distribution density of many stripe pitch, make the exhaust flow that passes through produce the eddy current disorder, thereby improved the heat exchange efficiency of cooler greatly.With respect to the Stainless Steel Tube with single helical groove, the present invention has significantly reduced the loss of gas pressure when improving heat exchange efficiency, reduced the resistance that the fin on the groove inner tube wall causes exhaust flow.In addition, good turbulence effect can't be deposited on the inwall of Stainless Steel Tube the particulate matter in the exhaust flow in the pipe, thereby effectively overcome existing various defectives of the Stainless Steel Tube with single helical groove and the deficiency used in the past, and obtained the favorable actual application effect.
Description of drawings
Fig. 1 is the structural representation of a preferred embodiment provided by the present invention;
Fig. 2 is a cross sectional representation embodiment illustrated in fig. 1;
Fig. 3 is the enlarged view of the groove of Fig. 2;
Fig. 4 is a helical groove schematic cross-section in another preferred embodiment provided by the present invention;
Fig. 5 is a kind of sectional view with Stainless Steel Tube of single helical groove commonly used at present;
Fig. 6 has the of the present invention sectional view similar to Fig. 5 groove structure;
Fig. 7 is the performance curve comparison diagram of Fig. 5, two kinds of stainless steel heat dissipating pipes shown in Figure 6;
Fig. 8 is the cross sectional representation of double helix groove heat dissipating pipe provided by the present invention;
Fig. 9 is the sectional view with double helix groove heat dissipating pipe similar to Fig. 5 groove structure.
Embodiment
Below, also the present invention is described in further detail in conjunction with the accompanying drawings by specific embodiment.
Embodiment one
Figure 1 shows that the overall structure schematic representation of a preferred embodiment provided by the present invention.This embodiment has three helical grooves.Among the figure, surface smoothing, diameter are 6.35mm, and wall thickness is that its axial direction spiral surrounding pressure of outer wall upper edge of the Stainless Steel Tube 10 of 0.25mm is provided with first helical groove 1, second helical groove 2 and the triple helical groove 3.These three helical grooves are to be looped around helical groove complete on the stainless steel pipe surface wall, and form the fin 31 of first spiral helicine fin 11, the second spiral helicine fin 21 and triple helical shape respectively in the inner wall surface (referring to Fig. 2) of Stainless Steel Tube.Article three, the interval between the helical groove is 120 ° at a distance of angle A on the circumference of the cross section of Stainless Steel Tube each other.Among Fig. 1, the pitch of grooves between the triple helical groove pipe adjacent grooves is 6mm.
For ease of a plurality of Stainless Steel Tubes are assembled into cooler, the two ends of Stainless Steel Tube 10 are respectively equipped with surface smoothing section 12.The length of this smooth section 12 is 12mm.For different coolers, the length dimension of smooth section 12 can be grasped flexibly according to concrete needs.
Figure 3 shows that the shape enlarged diagram of helical groove in the present embodiment.The sectional shape of three helical grooves of present embodiment is " V " shape.In actual production, the cross section of " V " shape helical groove itself is not symmetrical, and therefore, the sectional shape of present embodiment helical groove is for being similar to " V " font.In the present embodiment, sidewall that should " V " shape helical groove is the arc that seamlessly transits by the bottom to the part of Stainless Steel Tube 10 flat surfaces, and its depth H is 0.7mm." V " shape helical groove bottom width is less than 0.5mm.
Embodiment two
Present embodiment and the difference of the foregoing description one only are that the sectional shape of the helical groove that adopts is different, and the sectional shape of this helical groove is approximate " U " font (referring to Fig. 4).The bottom width of " U " shape helical groove among Fig. 4 is greater than 0.5mm, and sidewall that should " U " shape helical groove also is the arc that seamlessly transits by the bottom to the part of Stainless Steel Tube 10 flat surfaces.
Stainless steel heat dissipating pipe with two or three helical grooves involved in the present invention with the Stainless Steel Tube with single helical groove relatively in, the advantage that is had can be by finding out referring to Fig. 5, structure shown in Figure 6 and reduced parameter curve shown in Figure 7.
Fig. 5 is the sectional view with Stainless Steel Tube of single helical groove; Fig. 6 is the sectional view with three helical groove stainless steel heat dissipating pipes involved in the present invention.
For guaranteeing the science of measurement of comparison, Fig. 5, two Stainless Steel Tubes shown in Figure 6 all adopt identical mother metal, and the groove depth of their helical groove is identical, i.e. H
1=H
3Other size such as external diameter, wall thickness, length etc. are all identical, and when pressure is established helical groove, the pitch of grooves of the adjacent grooves of above-mentioned two kinds of Stainless Steel Tubes are equated, i.e. P
1=P
3
In the measurement, the hot air flow that will have uniform pressure, velocity variations passes through above-mentioned two Stainless Steel Tubes respectively, and radiating efficiency and outlet atmospheric pressure lost are measured, and obtains parameter comparison curve shown in Figure 7.
From Fig. 7, can obviously find out, when the speed of hot air flow is accelerated gradually, Stainless Steel Tube also progressively improves the loss of air pressure, the atmospheric pressure lost numerical value of wherein single helical groove Stainless Steel Tube presents the trend that significantly increases, and the atmospheric pressure lost numerical value of triple helical groove Stainless Steel Tube provided by the present invention then increases less.This point is extremely important in the diesel engine exhaust recycle cooler, because when bigger deviation takes place with outlet air pressure numerical value in the inlet air pressure of heat dissipating pipe, to directly influence the using effect of cooler for recycled exhaust gas, thereby can not effectively reach the requirement of waste gas emission standard.
About radiating efficiency, quickening with hot air flow speed, three helical groove Stainless Steel Tubes provided by the present invention have the radiating efficiency reduction value littler than single-screw groove Stainless Steel Tube, this be because: many helical grooves can be under the prerequisite that does not increase gas-flow resistance, aggravation flows into the disorderly degree of air-flow in the heat dissipating pipe, thereby has caused the raising of radiating efficiency; Secondly, many helical grooves increase the area of contact of hot air flow and stainless steel inside pipe wall to some extent, thereby have promoted heat exchanging process, have played auxiliary effect to improving radiating efficiency.
Why above-mentioned experiments of measuring result has such difference, and its reason just is: triple helical groove Stainless Steel Tube provided by the present invention has bigger lead angle.So-called lead angle is meant when Stainless Steel Tube is holded up, and (lead angle of single helical groove Stainless Steel Tube is E along the tangent line of helical groove ascent direction and the angle E of horizontal plane
1, the lead angle of triple helical groove Stainless Steel Tube is E
3).
When the external diameter of Stainless Steel Tube was determined, lead angle had determined helix pitch.Lead angle king bolt spacing more is just big more.Otherwise after having set helix pitch, lead angle is also just determined naturally.In above-mentioned contrast experiment, because the helix pitch of two Stainless Steel Tubes is identical, but for triple helical groove pipe, the helix pitch of its each helical groove is actually 3 times of helix pitch of single-screw groove Stainless Steel Tube shown in Figure 5, so, the lead angle E of triple helical groove pipe
3Lead angle E much larger than single-screw groove pipe
1
The cross section of double helix groove Stainless Steel Tube involved in the present invention as shown in Figure 8.Among the figure, two helical grooves apart angle B on the circumference of the cross section of Stainless Steel Tube is 180 °.
Identical with above-mentioned contrast experiment, double helix groove Stainless Steel Tube shown in Figure 8 also adopts the mother metal manufacturing identical with single-screw groove Stainless Steel Tube, and makes groove depth flute pitch and other size all identical (concrete structure is referring to Fig. 9) of their helical groove.
Double helix groove Stainless Steel Tube shown in Figure 9 and single-screw groove Stainless Steel Tube comparison shown in Figure 5, the pitch of grooves of the adjacent grooves of two Stainless Steel Tubes is equal, i.e. P
1=P
2, and the groove depth of two Stainless Steel Tubes is identical, i.e. H
1=H
2At this moment as can be seen, the lead angle E of double helix groove Stainless Steel Tube
2Between the lead angle of single-screw groove Stainless Steel Tube and triple helical groove Stainless Steel Tube, equally also much larger than the lead angle E of single-screw groove Stainless Steel Tube
1
Be not difficult to obtain to draw a conclusion by above-mentioned analysis by thrust: double helix groove stainless steel heat dissipating pipe lead angle to the atmospheric pressure lost numerical value that hot air flow was caused that quickens to flow through and radiating efficiency reduction value too between single-screw groove Stainless Steel Tube and triple helical groove Stainless Steel Tube.Therefore, double helix groove Stainless Steel Tube provided by the present invention has less atmospheric pressure lost numerical value and higher radiating efficiency equally.
In a word, for single-screw groove Stainless Steel Tube, the advantage that the present invention has is:
1, because lead angle is big, and unit form variable-area deformation quantity is little, make grooved mild more (more level and smooth to the transition of groove bottom most portion) from pipe flat surface part, the generation area of turbulent flow increases, and has improved heat exchange efficiency greatly.
2, because lead angle is big, and screw thread itself is very mild, the inner projection of pipe is also milder, and the resistance of gas is obviously reduced, and has solved the problem of the gas pressure difference at cooler heat-exchange tube two ends.
3, because lead angle is big, and the amount of deformation of pipe deformation part unit area is less, and it is milder that groove seems, promptly groove dehisce greatlyyer, make that the stress of pipe is less, add and be difficult for man-hour breaking.Therefore product rejection rate is low, and relative cost has also obtained reduction, is more convenient for installing and using.
In sum, the present invention can reduce the pressure loss of waste gas significantly, can also improve heat exchange efficiency simultaneously, reduces the internal stress of pipe, therefore have than the more obvious advantage of single-screw groove Stainless Steel Tube, can adapt to Euro V emissions fully gaseous effluent institute requirement.
It should be noted last that: above embodiment is the unrestricted technological scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1, the helical groove heat dissipating pipe used of a kind of diesel engine exhaust recycle cooler, it comprises the Stainless Steel Tube of surface smoothing, it is characterized in that: its axial direction spiral surrounding of Stainless Steel Tube outer wall upper edge is pressed and is provided with two or three helical grooves; Described helical groove forms two or three spiral fins in the inner wall surface of Stainless Steel Tube; Interval between described two helical grooves on the circumference of the cross section of Stainless Steel Tube each other at a distance of 180 °; Interval between described three helical grooves on the circumference of the cross section of Stainless Steel Tube each other at a distance of 120 °; The diameter of described Stainless Steel Tube is 6mm-12mm.
2, the helical groove heat dissipating pipe used of diesel engine exhaust recycle cooler according to claim 1, it is characterized in that: described helical groove is to be looped around groove complete on the stainless steel pipe surface wall, and the pitch of grooves of adjacent helical groove is 6mm-12mm.
3, the helical groove heat dissipating pipe used of diesel engine exhaust recycle cooler according to claim 1 and 2, it is characterized in that: the degree of depth of described helical groove is 0.4mm-1.0mm.
4, the helical groove heat dissipating pipe used of diesel engine exhaust recycle cooler according to claim 1, it is characterized in that: the two ends of described Stainless Steel Tube have the surface smoothing section of being convenient to assemble.
5, the helical groove heat dissipating pipe of using according to claim 1 or 2 or 4 described diesel engine exhaust recycle coolers, it is characterized in that: the wall thickness of described Stainless Steel Tube is 0.25mm-0.5mm.
6, the helical groove heat dissipating pipe used of diesel engine exhaust recycle cooler according to claim 1 is characterized in that: the cross section of described helical groove is " V " shape or " U " shape.
7, the helical groove heat dissipating pipe used of diesel engine exhaust recycle cooler according to claim 6, it is characterized in that: the bottom width of described " V " shape helical groove is not more than 0.5mm, and sidewall that should " V " shape helical groove is the arc that seamlessly transits by the bottom to the part of Stainless Steel Tube flat surface.
8, the helical groove heat dissipating pipe used of diesel engine exhaust recycle cooler according to claim 6, it is characterized in that: the bottom width of described " U " shape helical groove is not less than 0.5mm, and sidewall that should " U " shape helical groove is the arc that seamlessly transits by bottom portion of groove to the part of Stainless Steel Tube flat surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100690499A CN100347419C (en) | 2004-07-16 | 2004-07-16 | Screw groove heat radiation tube for diesel engine waste gas recirculation cooler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100690499A CN100347419C (en) | 2004-07-16 | 2004-07-16 | Screw groove heat radiation tube for diesel engine waste gas recirculation cooler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1587652A true CN1587652A (en) | 2005-03-02 |
| CN100347419C CN100347419C (en) | 2007-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100690499A Expired - Fee Related CN100347419C (en) | 2004-07-16 | 2004-07-16 | Screw groove heat radiation tube for diesel engine waste gas recirculation cooler |
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| CN (1) | CN100347419C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460796C (en) * | 2006-05-22 | 2009-02-11 | 北京美联桥科技发展有限公司 | Multi-tube pass type heat exchanger |
| CN100460795C (en) * | 2006-05-22 | 2009-02-11 | 北京美联桥科技发展有限公司 | U-shape tube type heat exchanger |
| CN103953815A (en) * | 2014-05-16 | 2014-07-30 | 中国海洋石油总公司 | Heavy oil well test spiral synergy heating pipe |
| CN108131525A (en) * | 2018-01-22 | 2018-06-08 | 南通中远克莱芬船舶工程有限公司 | A kind of dehumidifier socket wrench specially adapted for it compensator |
Families Citing this family (1)
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| US8478565B2 (en) * | 2010-07-02 | 2013-07-02 | GM Global Technology Operations LLC | Method of monitoring soot mass in a particulate filter and monitoring system for same with correction for active regeneration inefficiency |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2158068Y (en) * | 1993-05-22 | 1994-03-02 | 北京理工大学 | Cyclone tube with shaped indents |
| JP2000283663A (en) * | 1999-03-30 | 2000-10-13 | Toyota Motor Corp | Exhaust gas cooling device |
| CN2503447Y (en) * | 2001-03-19 | 2002-07-31 | 安丰宝 | Forced turbulent heat transfer pipe |
| JP2003161209A (en) * | 2001-11-28 | 2003-06-06 | Hino Motors Ltd | Egr cooler |
| AU2002257494A1 (en) * | 2002-04-30 | 2003-11-17 | Beijing U Bridge Llc | A stainless pipe used in a cooler for a diesel engine egr system |
| CN2720138Y (en) * | 2004-08-27 | 2005-08-24 | 北京美联桥科技发展有限公司 | Spiral-slot radiating pipe for diesel engine waste gas recirculation cooling device |
-
2004
- 2004-07-16 CN CNB2004100690499A patent/CN100347419C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100460796C (en) * | 2006-05-22 | 2009-02-11 | 北京美联桥科技发展有限公司 | Multi-tube pass type heat exchanger |
| CN100460795C (en) * | 2006-05-22 | 2009-02-11 | 北京美联桥科技发展有限公司 | U-shape tube type heat exchanger |
| CN103953815A (en) * | 2014-05-16 | 2014-07-30 | 中国海洋石油总公司 | Heavy oil well test spiral synergy heating pipe |
| CN108131525A (en) * | 2018-01-22 | 2018-06-08 | 南通中远克莱芬船舶工程有限公司 | A kind of dehumidifier socket wrench specially adapted for it compensator |
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| Publication number | Publication date |
|---|---|
| CN100347419C (en) | 2007-11-07 |
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Granted publication date: 20071107 |