CN2347132Y - Heat transfer tube with high-low thread teeth on inner surface - Google Patents
Heat transfer tube with high-low thread teeth on inner surface Download PDFInfo
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- CN2347132Y CN2347132Y CN 98242525 CN98242525U CN2347132Y CN 2347132 Y CN2347132 Y CN 2347132Y CN 98242525 CN98242525 CN 98242525 CN 98242525 U CN98242525 U CN 98242525U CN 2347132 Y CN2347132 Y CN 2347132Y
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- 238000012546 transfer Methods 0.000 title claims abstract description 76
- 239000007788 liquid Substances 0.000 claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 27
- 230000008016 vaporization Effects 0.000 abstract description 17
- 238000009834 vaporization Methods 0.000 abstract description 14
- 239000012530 fluid Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 16
- 238000009835 boiling Methods 0.000 description 14
- 210000000332 tooth crown Anatomy 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010835 comparative analysis Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 210000000664 rectum Anatomy 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
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Abstract
The utility model discloses a heat transfer pipe with high-low thread teeth on the inner surface, relates to a heat transfer pipe which is arranged in a heat exchanger and the liquid flow is converted in the pipe, and is characterized in that the inner surface of the heat transfer pipe is provided with thread teeth with different tooth heights. Because the tooth height of the threads on the inner surface of the tube is not completely consistent, the turbulence effect of liquid flow in the heat transfer tube is more obvious, the vaporization core is easier to form, and the air resistance effect is further relieved, so that the heat transfer performance is greatly improved. And simultaneously, the utility model provides the high heat transfer performance and the pipe cost than, reduced intraductal pressure loss, improved the performance of complete machine.
Description
The utility model is the heat-transfer pipe that has the height thread about inner surface, be meant especially a kind of improved inner surface have thread be fit to be installed on such as in the heat exchangers such as air-conditioning, refrigerator and heat-transfer pipe liquid stream carries out the states of matter conversion in pipe.
The heat-transfer pipe (hereinafter referred to as the stage teeth riffled tube) that described inner surface has the height thread is the screw thread that to have many stage teeth on the inner surface of metal tube (as copper pipe or the like) be the spiral of certain difference, as shown in Figure 1.
Its operation principle of heat-transfer pipe that this type of is installed in the heat exchanger and liquid stream carries out the states of matter conversion in pipe is, with the evaporimeter is example, cold-producing medium in the pipe is owing to constantly carry out the i.e. vaporization of states of matter conversion, thereby constantly absorb heat, and the reduction of the temperature that will bring thus by heat exchanger passes, its work relationship is: Q=U*F Δ t (wherein, Q is a heat output, U is an overall heat-transfer coefficient, and F is a heat transfer area, and Δ t is an effective temperature difference).To need the good heat transfer performance be overall heat-transfer coefficient to heat-transfer pipe for this reason.What of the vaporization rate of the liquid stream in the heat transfer property of tube wall, the pipe and the nucleus of boiling are the principal element that influences this overall heat-transfer coefficient have, the described nucleus of boiling is meant that liquid fluid temperature owing to certain point in vaporescence causes liquid relative fierce in this some vaporization with the significant difference of environment temperature, the cross sectional shape of spiral shell ridge to the formation of nucleus of boiling influence significantly, wherein especially with the influence factor maximum of Luo Jidingjiao (α).Leg-of-mutton spiral shell ridge can form the best nucleus of boiling in liquid, and the cross sectional shape of spiral shell ridge is the not good enough relatively of shape such as parabola shaped, trapezoidal, circular arc.The factor that influences vaporization rate is many, as the difference of temperature, fluid temperature and the environment temperature of liquid and size of pressure etc.In addition, the higher vapour lock effect that the zone produced of gaseous state evaporant concentration that forms behind the vaporizing liquid also can influence vaporization rate.
Be installed in the heat exchanger in the prior art and liquid stream carries out the states of matter conversion in pipe heat-transfer pipe bare pipe commonly used.Have in this type of heat-transfer pipe of screw thread at the inner surface of having invented, as Chinese invention patent 85103367 (CN1012994B) disclosed a kind of " inner surface has the heat-transfer pipe of screw thread ", its inner surface has the helical thread that many tooth depths equate, such heat-transfer pipe (hereinafter referred to as the equal-depth teeth screwed pipe) with respect to bare pipe owing to form a plurality of nucleus of boiling and increased that gasifying surface is long-pending to make heat transfer property improve greatly.But such heat-transfer pipe still has following weak point, need be improved:
1, heat transfer property awaits improving.
As everyone knows, along with constantly carrying out of vaporizing, liquid level constantly reduces cold-producing medium, is vaporized fully until cold-producing medium in evaporimeter.In evaporimeter begins the heat-transfer pipe of part, liquid level is higher than the thread tooth depth, at this moment, liquid is higher than the part of thread tooth depth because the effect axially-movable speed of pipe internal pressure is very fast, and the part that is lower than the thread tooth depth is slower because of dough nut effect axially-movable speed, described dough nut effect is meant that fluid such as cold-producing medium are when mobile, because the capillarity of screw thread, liquid is gone in the groove of screw thread, and produce a centrifugal force by the speed of liquid liquid is trended towards along groove circulation, at this moment, the wake turbulence effect that fluid showed is comparatively obvious, be that fluid is stirred more violently, the wake turbulence effect has reduced the temperature difference of fluid inside with flow surface, has improved vaporization rate.Along with cold-producing medium in evaporimeter along with constantly the carrying out of vaporization, liquid level is lower than the tooth depth of equal-depth teeth riffled tube, do not have the wake turbulence effect this moment, vaporization rate reduces, heat transfer property is influenced.
In addition, in the heat-transfer pipe of evaporimeter latter half, along with the vaporization constantly carry out, liquid level progressively reduces, be starkly lower than the tooth depth of equal-depth teeth riffled tube when liquid level after, this moment the nucleus of boiling quantity significantly reduce.Await improving.
The version of evaporimeter has determined the heat-transfer pipe total length can to have bending, because the existence of buckling phenomenon, the pipe latus rectum can change, and logistics speed also has respective change in the pipe.The tube refrigerant flow velocity is a non-uniform velocity, thereby liquid film can occur the thickness phenomenon is arranged in some areas.The difference of the distribution height of steam state evaporant concentration upper zone has the contribution effect in the thickness phenomenon double thread pipe pipe of liquid film, and the difference of this distribution height has been alleviated the vapour lock effect.But for the equal-depth teeth riffled tube, owe significantly, await improving.
We analyze from the production technology of heat exchanger again, heat-transfer pipe is when making heat exchanger, need through the mechanical expanding technical process, distortion after the triangle crown of equal-depth teeth riffled tube is squeezed during expand tube, because the tooth depth of equal-depth teeth riffled tube equates, the whole damaged of crown, promptly the Zui Jia nucleus of boiling is damaged.
2, heat transfer property is low with the ratio of pipe cost.
In the heat-transfer pipe of evaporimeter latter half, along with constantly carrying out of vaporization, liquid level has been significantly less than the tooth depth of equal-depth teeth riffled tube, at this moment, though area increases and vaporization is contributed to some extent because capillarity causes vaporizing to be higher than the spiral shell ridge of liquid level part, but because the spiral shell ridge part one that exposes liquid level is because the cause of its volume has increased the loss of pipe internal pressure, the 2nd, increased the weight of unit length, improved cost.Thereby comprehensive, its efficient of equal-depth teeth riffled tube is insufficient, and is low with the ratio of pipe cost at evaporimeter latter half heat transfer property especially.
The purpose of this utility model provides the heat-transfer pipe that a kind of improved inner surface with high heat-transfer performance has thread.
The relative higher improved inner surface of ratio that another purpose of the present utility model provides a kind of heat transfer property and pipe cost has the heat-transfer pipe of thread.
Inventive concept of the present utility model is: by the improvement to the heat-transfer pipe inner surface structure, improve the vaporization rate of intraluminal fluid stream.
The utility model is based on following another inventive concept: by improvement to the heat-transfer pipe inner surface structure, and the heat-transfer pipe that provides a kind of nucleus of boiling of intraluminal fluid stream to be easier to form.
The utility model based on another inventive concept be: by improvement, provide the ratio relative higher heat-transfer pipe of a kind of heat transfer property with the pipe manufacturing cost to the heat-transfer pipe inner surface structure.
Technical solution of the present utility model is: inner surface of the present utility model has the thread that does not highly wait.Be that the utility model is the heat-transfer pipe that inner surface has the height thread.
The axial line that inner surface described in the utility model has the interior inner surface thread crown of its pipe of heat-transfer pipe of height thread is a broken line of being made up of according to certain rules the multistage straight line, and this broken line clocklike fluctuates around an axis that parallels with heat-transfer pipe.
Because the tooth depth of inner surface screw thread is not quite identical in the pipe, the utility model:
One, heat transfer property is improved greatly:
1. the wake turbulence effect that shown in heat-transfer pipe of liquid stream is more obvious.
Shown in the accompanying drawing 3 be one group of riffled tube work of having amplified the time axially cut open and show sketch, (in order to say something easily, this figure selects for use bigger equal-depth teeth riffled tube of one group of helical angle (β) and stage teeth riffled tube to do comparative analysis, wherein, the low tooth of high tooth is staggered its each low tooth height (Hf in the stage teeth riffled tube
2) equate its each high tooth height (Hf
1) also equate and equal the tooth depth of equal-depth teeth riffled tube), be example, referring to Fig. 3:
In the evaporimeter rear section, liquid level (H) is lower than low tooth height (Hf
2), at this moment, two kinds of interior liquid streams of screwed pipe are circulation, and no wake turbulence effect is seen Fig. 3 (a-1), Fig. 3 (a-2).
At the evaporimeter mid portion, the liquid level of stage teeth riffled tube (H) is lower than high tooth height (Hf
1) and be higher than low tooth height (Hf
2), i.e. (Hf
1)＞(H)＞(Hf
2), the wake turbulence effect is obvious, sees Fig. 3 (b-1); And this moment corresponding equal-depth teeth riffled tube in, liquid level (H) is lower than high tooth height (Hf
1), liquid stream advances along roller seating space, and no wake turbulence effect is seen Fig. 3 (b-2).
In the beginning part of evaporimeter, the liquid level of equal-depth teeth riffled tube (H) is higher than high tooth height (Hf
1), the wake turbulence effect is obvious, sees Fig. 3 (c-2); And this moment corresponding stage teeth screwed pipe because the secondary stirring effect of fluid, stir more violently, see Fig. 3 (c-1).
By above analysis as can be known, comprehensive than the equal-depth teeth riffled tube, the wake turbulence effect of stage teeth internal thread intraluminal fluid stream is more obvious.
2. the nucleus of boiling is easier to form.
In the heat-transfer pipe of evaporimeter latter half, along with constantly carrying out of vaporization, liquid level progressively reduces, and is lower than the high tooth height (Hf of equal-depth teeth riffled tube when liquid level (H)
1) and be higher than and equal low tooth height (Hf
2), i.e. (Hf
1)＞(H) 〉=(Hf
2), the stage teeth riffled tube is owing to the existence of low tooth crown under its liquid level at this moment, and for the equal-depth teeth screwed pipe, nucleus of boiling number is obviously more.
In addition, because the nucleus of boiling that the stage teeth riffled tube produces distributes at various height, the bottom bubble may produce the disengaging that helps the upper strata bubble with the collision of upper strata bubble in the motion that breaks away from liquid.
3. further alleviated the vapour lock effect.
Inner surface has the heat-transfer pipe of height thread because its tooth depth distributes not point-blank, and the difference of nucleus of boiling distribution height further increases, and the vapour lock effect is further alleviated.
4. Bu Fen the best nucleus of boiling is protected.
Inner surface has the heat-transfer pipe of height thread in the mechanical expanding technical process, and the crown of low tooth is protected and avoid damage.
Two, because the tooth depth of the interior inner surface thread of pipe is not quite identical, the utility model has reduced the weight of unit length, has saved cost.Its heat transfer property is relative higher with the ratio of pipe manufacturing cost.
Three, in addition, the stage teeth riffled tube has improved machine performance because latus rectum increase in its pipe has reduced the pipe internal pressure loss.
In sum, the stage teeth riffled tube has the high plurality of advantages of ratio of good heat-transfer, heat transfer property and pipe manufacturing cost than equal-depth teeth riffled tube.
Below we will be by analysis to the correlation between the high tooth in the stage teeth riffled tube pipe, low tooth and pipe wall thickness, study these relations to the influence of the combination property of stage teeth riffled tube (is that the riffled tube of two kinds of height is an example with tooth depth in managing):
The influence that arrangement regulation brought of A. high tooth and low tooth:
When the height thread is staggered, as Fig. 5-f illustrated embodiment, wake turbulence effect the best of intraluminal fluid stream.This moment, the axial line of crown was a jaggies.When having the adjacent arrangement of the thread of equal height, as Fig. 5-b illustrated embodiment, the wake turbulence effect of the liquid of the thread between cog of these two equal heights stream is not good enough, and the heat transfer property of riffled tube is not good enough; When pipe internal thread tooth had multiple tooth depth, as Fig. 5-a illustrated embodiment, the wake turbulence effect of this riffled tube intraluminal fluid stream was also not good enough, and the heat transfer property of riffled tube is not good enough.
The influence that ratio brought of B. high tooth height and pipe wall thickness:
The ratio of high tooth height and pipe wall thickness be 0.65 o'clock ideal.The odds ratio ideal value is big more, and heat-transfer pipe is easy to crack more in the mechanical expanding technical process, and the odds ratio ideal value is more little, and the one, heat transfer property is poor more, and the 2nd, cost improves, and economic performance is poor more.Its distributed areas of ratio that experiment showed, high tooth height of acceptable and pipe wall thickness are 0.6～0.8.
The influence that ratio brought of the tooth depth of C. low tooth and high tooth:
The ratio of the tooth depth of low tooth and high tooth be 0.8 o'clock ideal.Along with this ratio approaches 1, the wake turbulence effect of intraluminal fluid stream is not obvious more.Along with the reduction of this ratio, the wake turbulence effect of intraluminal fluid stream weakens equally, and simultaneously, the effective heat exchange area in the pipe also weakens.Its distributed areas of ratio that experiment showed, the tooth depth of low tooth of acceptable and high tooth are 0.6～0.9.
The influence that the ratio of D. high tooth and the number of teeth of low tooth is brought:
The ratio of the number of teeth of the number of teeth of high tooth (z1) and low tooth (z2) be 1 o'clock ideal.To depart from ideal value big more along with ratio, and the wake turbulence effect of intraluminal fluid stream is not obvious more; In addition, heat-transfer pipe needs through the mechanical expanding technical process when making heat exchanger, the stressed extruding of high tooth during expand tube in the stage teeth riffled tube, and the low tooth power that is not squeezed.The ratio of the number of teeth of high tooth and low tooth is 1 o'clock, and heat-transfer pipe is stressed the most even during expand tube, and its mechanical performance is best, and its heat-transfer pipe of made heat exchanger contacts also the best with the fin in its outside.Its distributed areas of ratio that experiment showed, the number of teeth of high tooth of acceptable and low tooth are 0.5～2.0.
Based on above analysis, best its thread cross sectional shape of riffled tube is a triangle, and the ratio of the number of teeth of high tooth and low tooth is 1, and the axial line of crown is a jaggies, and its height thread is staggered, and low tooth is 0.8 with the ratio of the tooth depth of high tooth.
For tooth depth in the pipe is the riffled tube of height more than two kinds, as have the riffled tube of high, medium and low three kinds of height threads in managing, the relation of its various between cog and the combination property of riffled tube influenced mechanism and above-mentioned identical with relation between pipe wall thickness.Do not do labor at this.
Below we will be described in further details the utility model in conjunction with the accompanying drawings and embodiments:
Fig. 1 (a) and Fig. 1 (b) are respectively the radially cut-away view and the axial cut-away view of the stage teeth riffled tube shown in the utility model embodiment.
Fig. 2 (a) and Fig. 2 (b) are respectively the radially cut-away view and the axial cut-away view of equal-depth teeth riffled tube.
Fig. 3 is that axially cuing open in one group of riffled tube course of work of having amplified shown sketch, (in order to say something easily, this figure selects for use bigger equal-depth teeth riffled tube of one group of helical angle (β) and stage teeth riffled tube to do comparative analysis, wherein, the low tooth of high tooth is staggered its each low tooth height (Hf in the stage teeth riffled tube
2) equate its each high tooth height (Hf
1) also equate and equal the tooth depth of equal-depth teeth riffled tube), wherein, Fig. 3 (a-1) is lower than low tooth height (Hf for liquid level (H)
2) time stage teeth riffled tube schematic diagram, Fig. 3 (a-2) is the schematic diagram of equal-depth teeth riffled tube this moment; Fig. 3 (b-1) is lower than high tooth height (Hf for liquid level (H)
1) and be higher than low tooth height (Hf
2), i.e. (Hf
1)＞(H)＞(Hf
2) time stage teeth riffled tube schematic diagram, Fig. 3 (b-2) is the schematic diagram of equal-depth teeth riffled tube this moment; Fig. 3 (c-1) is higher than high tooth height (Hf for liquid level (H)
1) time stage teeth riffled tube schematic diagram, Fig. 3 (c-2) is the schematic diagram of equal-depth teeth riffled tube this moment.
The part sectioned view that Fig. 4 has amplified for the stage teeth riffled tube shown in the utility model embodiment, and expression various piece and used symbol.
Fig. 5 is that inner surface has the riffled tube of tooth depth for two or more thread in one group of pipe, the schematic diagram of the axial line of its pipe internal thread tooth crown.
Fig. 6 is the contrast situation that stage teeth riffled tube and equal-depth teeth riffled tube heat exchange amount change with logistics flux in the pipe.Wherein: 1 is the stage teeth riffled tube, and 2 is the equal-depth teeth riffled tube.
Fig. 7 is the every mitron length of stage teeth riffled tube and equal-depth teeth riffled tube exchange capability of heat contrast situation under the unit heat transfer temperature difference.Wherein: 1 is the stage teeth riffled tube, and 2 is the equal-depth teeth riffled tube.
Referring to Fig. 4, present embodiment is that an external diameter (φ D)=7mm, diapire thick (Tf) are the heat transmission copper pipe of 0.25mm, on the inner surface of copper pipe, have 64 threads that equally distributed tooth depth does not wait, each screw thread is 14 ° with helical angle that tubular axis becomes (β), the cross sectional shape of thread is the triangle of drift angle (α)=40 °, wherein high tooth height (Hf
1) be 0.18mm, low tooth height (Hf
2) be 0.15mm.The cross-sectional area of two between cog is 0.26 with the ratio of the height of high tooth, and high tooth becomes height evenly to distribute with low tooth.
Below be one group of embodiment that does not provide accompanying drawing:
Fig. 5 is that inner surface has the riffled tube of tooth depth for two or more thread in one group of pipe, the schematic diagram of the axial line of its pipe internal thread tooth crown.
Fig. 5-a is the schematic diagram of axial line that has its pipe internal thread tooth crown of riffled tube of high, medium and low three kinds of tooth depths in the pipe, and the arrangement regulation of its thread is followed basic, normal, high cycle arrangement.
Fig. 5-b is the schematic diagram of axial line that has its pipe internal thread tooth crown of riffled tube of high and low two kinds of tooth depths in the pipe, high and low, low, low cycle arrangement that the arrangement regulation of its thread is followed.
Fig. 5-c is the schematic diagram of axial line that has its pipe internal thread tooth crown of riffled tube of high and low two kinds of tooth depths in the pipe, and the arrangement regulation of its thread is followed low, high, high, high cycle arrangement.
Fig. 5-d is the schematic diagram of axial line that has its pipe internal thread tooth crown of riffled tube of high and low two kinds of tooth depths in the pipe, high and low, low cycle arrangement that the arrangement regulation of its thread is followed.
Fig. 5-e is the schematic diagram of axial line that has its pipe internal thread tooth crown of riffled tube of high and low two kinds of tooth depths in the pipe, and the arrangement regulation of its thread is followed low, high, high cycle arrangement.
Fig. 5-f is the schematic diagram of axial line that has its pipe internal thread tooth crown of riffled tube of high and low two kinds of tooth depths in the pipe, and the arrangement regulation of its thread is followed high and low, high and low cycle arrangement.
Fig. 5-g is the schematic diagram of axial line that has its pipe internal thread tooth crown of riffled tube of high and low two kinds of tooth depths in the pipe, and the arrangement regulation of its thread is followed height, high and low, low cycle arrangement.
Fig. 5-h is the schematic diagram that has the axial line of its pipe internal thread tooth crown of high, medium and low riffled tube in the pipe, and the arrangement regulation of its thread is followed basic, normal, high cycle arrangement.Be with the difference of riffled tube shown in Fig. 5-a: the tooth depth geometric ratio of three kinds of teeth among this figure, and the non-geometric ratio of the tooth depth of three kinds of teeth among Fig. 5-a.
In conjunction with above one group of embodiment, we can draw: inner surface described in the utility model has the riffled tube of height thread, the axial line of its pipe internal thread tooth crown is a broken line of being made up of according to certain rules a plurality of straight lines, and this broken line is around an axis fluctuation that parallels with heat-transfer pipe.
Because the axial line of the described crown of Fig. 5-f is the embodiment of jaggies, its height thread is staggered, no matter from its mechanical performance still from the wake turbulence effect of intraluminal fluid stream, this embodiment is the best.
Described inner surface has the screwed pipe of height thread, and the tooth depth of the thread in its pipe can be for multiple, and the described embodiment of Fig. 5-a, Fig. 5-h is wherein two kinds.
In fact, from the course of work of intraluminal fluid stream, its thread tooth depth of desirable riffled tube should be stepping, and its Changing Pattern is to reduce along with the reduction of intraluminal fluid face, all is simultaneously the best nucleus of boiling to guarantee all high tooth crowns.Certainly, the manufacture difficulty of this riffled tube is higher, and manufacturing cost is also higher.The utility model is not made claim to this kind riffled tube.
Fig. 6 is the contrast situation that stage teeth riffled tube and equal-depth teeth riffled tube heat exchange amount change with logistics flux in the pipe.Wherein: 1 is the stage teeth riffled tube, and 2 is the equal-depth teeth riffled tube.Its test operating mode is: logistics is R22 in the pipe, and environment temperature is 30 ℃, and atmospheric pressure is 965mbar.
Fig. 7 is the every mitron length of stage teeth riffled tube and equal-depth teeth riffled tube exchange capability of heat contrast situation under the unit heat transfer temperature difference.Wherein: 1 is the stage teeth riffled tube, and 2 is the equal-depth teeth riffled tube.Its test operating mode is: logistics is R22 in the pipe, and environment temperature is 30 ℃, and atmospheric pressure is 965mbar.
By the contrast among Fig. 6 and Fig. 7, obviously as can be seen, the stage teeth riffled tube increases significantly than equal-depth teeth riffled tube exchange capability of heat.
Claims (8)
1. one kind is installed in the heat exchanger and liquid stream carries out the states of matter conversion in pipe inner surface has the heat-transfer pipe of height thread, its inner surface has many helical thread teeth, described thread is 7 ° to 30 ° to the helical angle (β) of tubular axis, drift angle (α) in the spiral shell ridge cross section is from 30 ° to 60 °, the cross-sectional area of two between cog is 0.15 to 0.55 with the ratio of the height of high tooth, it is characterized in that: the inner surface of heat-transfer pipe has the thread that does not highly wait, and promptly the utility model is the heat-transfer pipe that inner surface has the height thread.
2. inner surface according to claim 1 has the heat-transfer pipe of height thread, it is characterized in that: the axial line of inner surface thread crown is a broken line of being made up of according to certain rules the multistage straight line in the pipe, and this broken line is around an axis fluctuation that parallels with heat-transfer pipe.
3. have the just heat-transfer pipe of thread according to claim 1 or 2 arbitrary described inner surfaces, it is characterized in that: its distributed areas of the ratio of the number of teeth of high tooth and low tooth are 0.5～2.0.
4. have the just heat-transfer pipe of thread according to claim 1 or 2 arbitrary described inner surfaces, it is characterized in that: its distributed areas of ratio of the tooth depth of low tooth and high tooth are 0.6～0.9.
5. have the just heat-transfer pipe of thread according to claim 1 or 2 arbitrary described inner surfaces, it is characterized in that: its distributed areas of the ratio of high tooth height and pipe wall thickness are 0.6～0.8.
6. have the just heat-transfer pipe of thread according to claim 1 or 2 arbitrary described inner surfaces, it is characterized in that: the axial line of crown is a jaggies.
7. have the just heat-transfer pipe of thread according to claim 1 or 2 arbitrary described inner surfaces, it is characterized in that: the thread cross sectional shape is a triangle.
8. inner surface according to claim 1 has the heat-transfer pipe of height thread, it is characterized in that: the thread cross sectional shape is a triangle, the ratio of the number of teeth of high tooth and low tooth is 1, the axial line of crown is a jaggies, its height thread is staggered, and low tooth is 0.8 with the ratio of the tooth depth of high tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98242525 CN2347132Y (en) | 1998-10-27 | 1998-10-27 | Heat transfer tube with high-low thread teeth on inner surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98242525 CN2347132Y (en) | 1998-10-27 | 1998-10-27 | Heat transfer tube with high-low thread teeth on inner surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2347132Y true CN2347132Y (en) | 1999-11-03 |
Family
ID=33989075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98242525 Expired - Fee Related CN2347132Y (en) | 1998-10-27 | 1998-10-27 | Heat transfer tube with high-low thread teeth on inner surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2347132Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353296A (en) * | 2011-07-26 | 2012-02-15 | 金龙精密铜管集团股份有限公司 | Heat exchanger and internal threaded copper tube thereof |
| CN104949564A (en) * | 2015-07-08 | 2015-09-30 | 赤峰宝山能源（集团）贺麒铜业有限责任公司 | Straight tooth and high-low tooth internal thread heat transfer pipe |
| CN109813172A (en) * | 2019-03-18 | 2019-05-28 | 青岛登辉机械配件有限公司 | Inner screw thread copper pipe and its processing technology |
| CN111256211A (en) * | 2020-01-20 | 2020-06-09 | 海信（山东）空调有限公司 | Air conditioner |
-
1998
- 1998-10-27 CN CN 98242525 patent/CN2347132Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353296A (en) * | 2011-07-26 | 2012-02-15 | 金龙精密铜管集团股份有限公司 | Heat exchanger and internal threaded copper tube thereof |
| CN104949564A (en) * | 2015-07-08 | 2015-09-30 | 赤峰宝山能源（集团）贺麒铜业有限责任公司 | Straight tooth and high-low tooth internal thread heat transfer pipe |
| CN109813172A (en) * | 2019-03-18 | 2019-05-28 | 青岛登辉机械配件有限公司 | Inner screw thread copper pipe and its processing technology |
| CN111256211A (en) * | 2020-01-20 | 2020-06-09 | 海信（山东）空调有限公司 | Air conditioner |
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