CN201917256U - Heat exchange tube for tube type heat exchanger and tube type heat exchanger adopting same - Google Patents
Heat exchange tube for tube type heat exchanger and tube type heat exchanger adopting same Download PDFInfo
- Publication number
- CN201917256U CN201917256U CN2010206612757U CN201020661275U CN201917256U CN 201917256 U CN201917256 U CN 201917256U CN 2010206612757 U CN2010206612757 U CN 2010206612757U CN 201020661275 U CN201020661275 U CN 201020661275U CN 201917256 U CN201917256 U CN 201917256U
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- heat exchange
- pipe body
- exchange pipe
- tube
- 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.)
- Expired - Lifetime
Links
Images
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model relates to a heat exchange tube for a tube type heat exchanger and a tube type heat exchanger adopting the same, wherein the heat exchange tube for the tube type heat exchanger comprises a different-diameter heat exchange tube main body with variable cross section size; the cross section of the heat exchange tube main body is set to be a cross section of a rounded rectangle, an oblateness, a circle or a hexagon. The tube type heat exchanger comprises a tube bundle, a casing and a tube box, wherein the tube bundle comprises heat exchange tubes, which are the heat exchange tubes for the tube type heat exchanger. Because the cross section of the heat exchange tube for the tube type heat exchanger takes the shape of the cross section of the rounded rectangle, the oblateness, the circle or the hexagon, the contact area of fluid in the heat exchange tube cavities with the inner wall surfaces of the cavities can be greatly enlarged; and because the different-diameter tubes with variable cross section size are adopted to replace constant diameter tubes in the prior art, the flow speed of the fluid in the heat exchange tube cavities can be increased greatly to form turbulence, so that the heat transfer effect of the heat exchange tube for the tube type heat exchanger is improved greatly as well as the heat exchange efficiency. Therefore, the tube type heat exchanger has the characteristics of large heat exchange area, good heat transfer effect and high heat exchange efficiency.
Description
Technical field
The utility model relates to the high efficient heat exchanging energy-saving equipment technology of shell and tube heat exchange special equipment, particularly relates to a kind of heat exchanger tube and tubular heat exchanger thereof of tubular heat exchanger.
Background technology
In the prior art, tubular heat exchanger is called shell-and-tube heat exchanger or shell and tube condenser again, be applicable to " liquid---liquid ", " vapour---vapour " of industries such as chemical industry, oil, medicine, food, light industry, metallurgy, coking, the convection heat transfer' heat-transfer by convection of " vapour---liquid " heat exchange, and heat exchange condensation flow processs such as steam condensation and liquid evaporation heat transfer.Tubular heat exchanger is the heat exchanger that is most widely used in heating furnace and the air cooler.
Tubular heat exchanger common in the prior art generally is made of main members such as tube bank, housing, bobbin carriages, wherein, tube bank is the core of tubular heat exchanger, tube bank is made up of heat exchanger tube, support plate (or deflection plate) and tube sheet usually, form complete integral device with housing, bobbin carriage again, heat exchanger tube is as heat conducting element, determines the heat transfer property of tubular heat exchanger with support plate (or deflection plate).Bobbin carriage and housing then determine the bearing capacity of tubular heat exchanger and the security reliability of operation operation.The manufacturing process maturation of this tubular heat exchanger, the security performance height is an energy consumption equipment crucial in heat transmission equipment.
The heat exchanger tube of tubular heat exchanger of the prior art, great majority are to process as parent tube with seamless straight tube, generally be at its outer surface processing decorative pattern, with the heat exchange effect of enhanced heat exchange tube outer surface and heat exchanger shell side medium, but can't the enhanced tube inner surface and the heat exchange effect of tube side medium.This be because the external surface area of the smooth steel pipe of any surfaces externally and internally all greater than internal surface area (100t/r) %, wherein t and r are respectively the wall thickness and the interior pore radius of heat exchanger tube, as widely used cross section specification is the heat exchanger tube of φ 25 * 2.5, and external surface area is just greater than internal surface area 25 ﹪.
This shows that even if the heat exchanging tube outer surface does not carry out heat exchange reinforcement processing, the heat exchange effect of the heat exchange pipe external surface also heat exchange effect than heat exchanger tube inner surface is good.Therefore, the raising of heat exchanger tube inner surface heat exchange effect has become one of prerequisite that can heat exchange pipe external surface heat exchange effect work, and the heat exchange effect of heat exchanger tube inner surface has become the bottleneck and the restraining factors that improve the tube bank heat exchange efficiency.
Therefore, need badly at deficiency of the prior art:
Provide that a kind of heat exchange area is big, the heat exchanger tube of good effect of heat exchange, tubular heat exchanger that heat exchange efficiency is high; And
Provide a kind of and have that heat exchange area is big, the tubular heat exchanger of the heat exchanger tube of good effect of heat exchange, tubular heat exchanger that heat exchange efficiency is high.
The utility model content
One of the purpose of this utility model be to avoid weak point of the prior art and provide that a kind of heat exchange area is big, the heat exchanger tube of good effect of heat exchange, tubular heat exchanger that heat exchange efficiency is high.
Two of the purpose of this utility model be to avoid weak point of the prior art and provide a kind of and have that heat exchange area is big, the tubular heat exchanger of the heat exchanger tube of good effect of heat exchange, tubular heat exchanger that heat exchange efficiency is high.
The purpose of this utility model realizes by following technical measures:
The utility model provides a kind of heat exchanger tube of tubular heat exchanger, include heat exchange pipe body, wherein, described heat exchange pipe body is set to the reducing heat exchange pipe body that cross sectional dimensions changes, and the cross section of described heat exchange pipe body is set to round rectangle, oblate arc, circle or hexagonal cross section.
Wherein, described heat exchange pipe body is set to the reducing heat exchange pipe body of the ascending gradual change of cross sectional dimensions, perhaps is set to the reducing heat exchange pipe body of the descending gradual change of cross sectional dimensions.
Wherein, the heavy caliber cross section of described heat exchange pipe body one end with the area ratio of the small-bore cross section of the described heat exchange pipe body other end is: 3/2～9/4.
Wherein, the heavy caliber cross section of described heat exchange pipe body one end with the area ratio of the small-bore cross section of the described heat exchange pipe body other end is: 9/4.
Wherein, described heat exchange pipe body is provided with the heat exchange pipe body of pattern structure for its inner surface.
Wherein, described pattern structure is to have a kind of in salient point, concave point, spike-tooth, pin hole, ripple, band, twill, straight burr or the prismatic or more than one pattern structure.
Wherein, described heat exchange pipe body is the heat exchange pipe body that sheet material has seam welding, and the inner surface of described pattern structure and described heat exchange pipe body is one-body molded.
Wherein, described heat exchange pipe body is set to the heat exchange pipe body of helical disk tubular type.
Wherein, described heat exchange pipe body is set to the heat exchange pipe body of coiled.
The utility model also provides a kind of tubular heat exchanger, includes tube bank, housing and bobbin carriage, and described tube bank includes heat exchanger tube, and wherein, described heat exchanger tube is the heat exchanger tube of above each described tubular heat exchanger.
The beneficial effects of the utility model: the heat exchanger tube of tubular heat exchanger of the present utility model, include heat exchange pipe body, wherein, heat exchange pipe body is set to the reducing heat exchange pipe body that cross sectional dimensions changes, and the cross section of heat exchange pipe body is set to round rectangle, oblate arc, circle or hexagonal cross section.Tubular heat exchanger of the present utility model includes tube bank, housing and bobbin carriage, and tube bank includes heat exchanger tube, and wherein, heat exchanger tube is the heat exchanger tube of above-mentioned tubular heat exchanger.Because, it is circular that the heat exchanger tube of tubular heat exchanger adopts shape of cross section, oblate or hexagonal heat exchange pipe body, can significantly strengthen fully contacting of the intraluminal fluid of heat exchange and inner wall surface thereof, and the reduced pipe of selecting cross sectional dimensions to change replaces the isometrical pipe of prior art, can be so that the flow rate of fluid in the heat exchanger tube chamber significantly increases, the inwall collision contact probability of fluid and heat exchange pipe body significantly increases, the fluid of collision forms the little eddy current in more part, fluid is under the interference effect of the little eddy current in part, constantly change flowing velocity, form turbulent flow.Heat exchange is quickened, thereby strengthened the heat-transfer effect of the heat exchanger tube of tubular heat exchanger greatly, improve heat exchange efficiency.And, for " vapour---liquid " convection heat transfer' heat-transfer by convection, the reducing heat exchange pipe body that adopts cross sectional dimensions to change, can rationally utilize " vapour---liquid " conversion back pipe inner volume to change, saving cost, and make the more compact structure of heat exchanger tube of whole tubular heat exchanger, layout is more reasonable.Therefore adopt the tubular heat exchanger of the heat exchanger tube of above-mentioned tubular heat exchanger, have that heat exchange area is big, a good effect of heat exchange, characteristics that heat exchange efficiency is high.
Description of drawings
The utility model is described in further detail to utilize accompanying drawing, but the embodiment in the accompanying drawing does not constitute any restriction of the present utility model, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the following drawings.
Fig. 1 is the structural representation of the heat exchanger tube of a kind of tubular heat exchanger of the present utility model.
Fig. 2 is a kind of " A to " structural representation among Fig. 1.
Fig. 3 is another kind " A to " structural representation among Fig. 1.
Fig. 4 is the structural representation of the heat exchanger tube of another kind of tubular heat exchanger of the present utility model.
Fig. 5 is " B to " structural representation among Fig. 4.
Fig. 6 is the structural representation of the heat exchanger tube of another kind of tubular heat exchanger of the present utility model.
Fig. 7 is the structural representation of a kind of tubular heat exchanger of the present utility model.
In Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, include:
10---heat exchange pipe body, 11---heavy caliber, 12---is small-bore.
In Fig. 7, include:
1---heat exchanger tube, 2---tube bank, 3---housing, 4---bobbin carriage.
The specific embodiment
With the following Examples the utility model is further described.
Embodiment 1
One of specific embodiment of the heat exchanger tube of a kind of tubular heat exchanger of the present utility model, as Fig. 1, Fig. 2 and shown in Figure 3, include heat exchange pipe body 10, wherein, the shape of cross section of heat exchange pipe body 10 is set to hexagonal cross section, and heat exchange pipe body 10 is set to the reducing heat exchange pipe body 10 that cross sectional dimensions changes.The shape of cross section of heat exchange pipe body 10 can also be round rectangle, circle or the oblate arc except that hexagon.
Thus, can enlarge markedly fully contacting of the intraluminal fluid of heat exchange and inner wall surface thereof, and the reduced pipe of selecting cross sectional dimensions to change replaces isometrical pipe of the prior art, can be so that the flow rate of fluid in the heat exchanger tube chamber significantly increases, the inwall collision contact probability of fluid and heat exchange pipe body 10 significantly increases, and the fluid of collision forms the little eddy current in more part, and fluid is under the interference effect of the little eddy current in part, constantly change flowing velocity, form turbulent flow.Heat exchange is quickened, thereby strengthened the heat-transfer effect of the heat exchanger tube of tubular heat exchanger greatly, improve heat exchange efficiency.And, for " vapour---liquid " convection heat transfer' heat-transfer by convection, the reducing heat exchange pipe body 10 that adopts cross sectional dimensions to change, can rationally utilize " vapour---liquid " conversion back pipe inner volume to change, saving cost, and make the more compact structure of heat exchanger tube of whole tubular heat exchanger, layout is more reasonable.
Concrete, heat exchange pipe body 10 is set to the reducing heat exchange pipe body 10 of the ascending gradual change of cross sectional dimensions, perhaps is set to the reducing heat exchange pipe body 10 of the descending gradual change of cross sectional dimensions.
Concrete, the area ratio of small-bore 12 cross section of the cross section of the heavy caliber 11 of heat exchange pipe body 10 1 ends and heat exchange pipe body 10 other ends is: 3/2～9/4.
Concrete, heat exchange pipe body 10 is provided with the heat exchange pipe body 10 of pattern structure for its inner surface.
Heat exchange pipe body 10 can have the heat exchange pipe body 10 of seam welding one-tenth for sheet material, there is the heat exchange pipe body 10 of seam welding to be welded, to reduce cost and to be beneficial to the shaping processing of the heat exchange pipe body 10 of various shape of cross sections by the synthetic shape of steel coil strip and to its seam.Be different from seamless steel pipe of the prior art thus.
Concrete, pattern structure is to have a kind of in salient point, concave point, spike-tooth, pin hole, ripple, band, twill, straight burr or the prismatic or more than one pattern structure.The inner surface of heat exchanger tube is provided with pattern structure, its heat exchange area is enlarged markedly, fluid in the heat exchanger tube can produce strong turbulent flow under the interference of pattern structure, can further improve the heat exchange effect of heat exchanger tube inner surface, has improved the heat exchange efficiency of tubular heat exchanger.
Concrete, when heat exchange pipe body 10 adopts sheet material to have seam welding to become heat exchange pipe body 10, can the inner surface of pattern structure and heat exchange pipe body 10 is one-body molded.This pattern structure is by adopting process for machining such as mold pressing, annular knurl one-body molded on sheet material, having the manufacture craft characteristic of simple.
Concrete, as shown in Figure 6, heat exchange pipe body 10 is set to the heat exchange pipe body 10 of helical disk tubular type.Can also be set to the heat exchange pipe body 10 of coiled.With the turbulent effect of further raising, improve heat exchange efficiency.
Two of the specific embodiment of the heat exchanger tube of a kind of tubular heat exchanger of the present utility model, as shown in Figure 4 and Figure 5, the main technical schemes of present embodiment is identical with embodiment 1, unaccounted in the present embodiment feature, adopt the explanation among the embodiment 1, no longer give unnecessary details at this, and the parts identical with Fig. 3 with Fig. 1, Fig. 2 adopt identical label in Fig. 4 and Fig. 5.The difference of present embodiment and embodiment 1 is, the area ratio of small-bore 12 cross section of the cross section of the heavy caliber 11 of heat exchange pipe body 10 1 ends and heat exchange pipe body 10 other ends is 9/4.The shape of cross section of its heat exchange pipe body 10 adopts round rectangle.Heat-transfer effect the best, and be beneficial to the stringing of heat exchanger tube.
Embodiment 3
Three of the specific embodiment of the heat exchanger tube of a kind of tubular heat exchanger of the present utility model, the main technical schemes of present embodiment is identical with embodiment 1, and unaccounted feature adopts the explanation among the embodiment 1 in the present embodiment, no longer gives unnecessary details at this.The difference of present embodiment and embodiment 1 is, the area ratio of small-bore 12 cross section of the cross section of the heavy caliber 11 of heat exchange pipe body 10 1 ends and heat exchange pipe body 10 other ends is 3/2.
Embodiment 4
One of specific embodiment of a kind of tubular heat exchanger of the present utility model as shown in Figure 7, includes tube bank 2, housing 3 and bobbin carriage 4, and tube bank 2 includes heat exchanger tube 1, and wherein, heat exchanger tube 1 is the heat exchanger tube of the tubular heat exchanger described in the embodiment 1.
Embodiment 5
Two of the specific embodiment of a kind of tubular heat exchanger of the present utility model, as shown in Figure 7, the main technical schemes of present embodiment is identical with embodiment 4, and unaccounted feature adopts the explanation among the embodiment 4 in the present embodiment, no longer gives unnecessary details at this.The difference of present embodiment and embodiment 4 is that heat exchanger tube 1 is the heat exchanger tube of the tubular heat exchanger described in the embodiment 2.
Embodiment 6
Three of the specific embodiment of a kind of tubular heat exchanger of the present utility model, as shown in Figure 7, the main technical schemes of present embodiment is identical with embodiment 4, and unaccounted feature adopts the explanation among the embodiment 4 in the present embodiment, no longer gives unnecessary details at this.The difference of present embodiment and embodiment 4 is that heat exchanger tube 1 is the heat exchanger tube of the tubular heat exchanger described in the embodiment 3.
Should be noted that at last; above embodiment is only in order to the explanation the technical solution of the utility model; but not to the restriction of the utility model protection domain; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the essence and the scope of technical solutions of the utility model.
Claims (10)
1. the heat exchanger tube of a tubular heat exchanger, include heat exchange pipe body, it is characterized in that: described heat exchange pipe body is set to the reducing heat exchange pipe body that cross sectional dimensions changes, and the cross section of described heat exchange pipe body is set to round rectangle, oblate arc, circle or hexagonal cross section.
2. the heat exchanger tube of tubular heat exchanger according to claim 1, it is characterized in that: described heat exchange pipe body is set to the reducing heat exchange pipe body of the ascending gradual change of cross sectional dimensions, perhaps is set to the reducing heat exchange pipe body of the descending gradual change of cross sectional dimensions.
3. the heat exchanger tube of tubular heat exchanger according to claim 2, it is characterized in that: the heavy caliber cross section of described heat exchange pipe body one end with the area ratio of the small-bore cross section of the described heat exchange pipe body other end is: 3/2～9/4.
4. the heat exchanger tube of tubular heat exchanger according to claim 3, it is characterized in that: the heavy caliber cross section of described heat exchange pipe body one end with the area ratio of the small-bore cross section of the described heat exchange pipe body other end is: 9/4.
5. the heat exchanger tube of tubular heat exchanger according to claim 1, it is characterized in that: described heat exchange pipe body is provided with the heat exchange pipe body of pattern structure for its inner surface.
6. the heat exchanger tube of tubular heat exchanger according to claim 5 is characterized in that: described pattern structure is to have a kind of in salient point, concave point, spike-tooth, pin hole, ripple, band, twill, straight burr or the prismatic or more than one pattern structure.
7. the heat exchanger tube of tubular heat exchanger according to claim 5, it is characterized in that: described heat exchange pipe body is the heat exchange pipe body that sheet material has seam welding, and the inner surface of described pattern structure and described heat exchange pipe body is one-body molded.
8. the heat exchanger tube of tubular heat exchanger according to claim 5, it is characterized in that: described heat exchange pipe body is set to the heat exchange pipe body of helical disk tubular type.
9. the heat exchanger tube of tubular heat exchanger according to claim 5, it is characterized in that: described heat exchange pipe body is set to the heat exchange pipe body of coiled.
10. a tubular heat exchanger includes tube bank, housing and bobbin carriage, and described tube bank includes heat exchanger tube, it is characterized in that: described heat exchanger tube is the heat exchanger tube of each described tubular heat exchanger in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206612757U CN201917256U (en) | 2010-12-15 | 2010-12-15 | Heat exchange tube for tube type heat exchanger and tube type heat exchanger adopting same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206612757U CN201917256U (en) | 2010-12-15 | 2010-12-15 | Heat exchange tube for tube type heat exchanger and tube type heat exchanger adopting same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201917256U true CN201917256U (en) | 2011-08-03 |
Family
ID=44417050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206612757U Expired - Lifetime CN201917256U (en) | 2010-12-15 | 2010-12-15 | Heat exchange tube for tube type heat exchanger and tube type heat exchanger adopting same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201917256U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022943A (en) * | 2010-12-15 | 2011-04-20 | 茂名重力石化机械制造有限公司 | Heat exchange tube of tube type heat exchanger and tube type heat exchanger thereof |
| CN104823279A (en) * | 2013-04-24 | 2015-08-05 | 金诺儿 | Power thyristor unit cooling system |
| WO2017008108A1 (en) | 2015-07-10 | 2017-01-19 | Conflux Enterprises Pty Ltd (As Trustee) | Heat exchanger |
| CN106541009A (en) * | 2016-12-08 | 2017-03-29 | 燕山大学 | A kind of conical corrugated metal tube and manufacturing process |
| CN109539830A (en) * | 2018-07-20 | 2019-03-29 | 山东大学 | A kind of shell-and-tube heat exchanger of caliber change |
-
2010
- 2010-12-15 CN CN2010206612757U patent/CN201917256U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022943A (en) * | 2010-12-15 | 2011-04-20 | 茂名重力石化机械制造有限公司 | Heat exchange tube of tube type heat exchanger and tube type heat exchanger thereof |
| CN102022943B (en) * | 2010-12-15 | 2013-01-30 | 茂名重力石化机械制造有限公司 | Heat exchange tube of tube type heat exchanger and tube type heat exchanger thereof |
| CN104823279A (en) * | 2013-04-24 | 2015-08-05 | 金诺儿 | Power thyristor unit cooling system |
| CN104823279B (en) * | 2013-04-24 | 2017-09-08 | 金诺儿 | Power scr unit cooling system |
| WO2017008108A1 (en) | 2015-07-10 | 2017-01-19 | Conflux Enterprises Pty Ltd (As Trustee) | Heat exchanger |
| US11098954B2 (en) | 2015-07-10 | 2021-08-24 | Conflux Technology Pty Ltd | Heat exchanger |
| CN106541009A (en) * | 2016-12-08 | 2017-03-29 | 燕山大学 | A kind of conical corrugated metal tube and manufacturing process |
| CN106541009B (en) * | 2016-12-08 | 2018-07-03 | 燕山大学 | A kind of conical corrugated metal tube and manufacturing process |
| CN109539830A (en) * | 2018-07-20 | 2019-03-29 | 山东大学 | A kind of shell-and-tube heat exchanger of caliber change |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201917256U (en) | Heat exchange tube for tube type heat exchanger and tube type heat exchanger adopting same | |
| CN102022943B (en) | Heat exchange tube of tube type heat exchanger and tube type heat exchanger thereof | |
| CN201748825U (en) | Multilayer foam metal tube-and-shell heat exchanger | |
| CN2754038Y (en) | Twist flat-tube heat exchanger | |
| CN202630743U (en) | High-efficiency energy-saving heat exchanger | |
| CN203837550U (en) | Discontinuous and bi-directional warping type heat exchange tube | |
| CN114526618A (en) | Multi-flow inner sleeve spiral twisted flat tube wound tube type heat exchanger | |
| CN204027386U (en) | Sinusoidal wave coil heat exchanger | |
| CN202216587U (en) | heat exchanger using elliptical flat spiral heat exchange tube | |
| CN2901224Y (en) | Non-continuous asymmetric corrugated tube heat exchanger | |
| CN202221265U (en) | Shell-and-tube heat exchanger | |
| CN202339123U (en) | Welding continuous spiral curved surface baffle heat exchanger | |
| CN202109789U (en) | Heat exchange device using elliptic spiral heat exchange pipes | |
| CN206347902U (en) | A kind of efficient titanium coaxial sleeve heat exchanger | |
| CN201104137Y (en) | Helical baffle plate supporting special-shaped pipe condenser | |
| CN102095327A (en) | Heat exchange equipment using irregular-shaped heat exchange tubes | |
| CN211695990U (en) | Heat exchanger with internal thread heat exchange tube | |
| CN202109788U (en) | Heat exchange equipment adopting spiral oval heat exchange tubes | |
| CN203349686U (en) | Tubular heat exchanger and continuous composite spiral baffle plate thereof | |
| CN202660940U (en) | Spiral enhanced heat transfer tubular heat exchanger | |
| CN209085382U (en) | A kind of high-performance heat exchanger | |
| CN202216589U (en) | Heat exchanger applying rotating arc heat exchange tubes | |
| CN202442629U (en) | Heat exchange pipe for multi-head spiral groove | |
| CN2577228Y (en) | Pipe-casing type spiral boffle-plate heat-exchanger | |
| CN205156699U (en) | Double -helical -baffle heat exchanger |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110803 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |