CN109899987B - Heat exchanger - Google Patents
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- CN109899987B CN109899987B CN201910263904.6A CN201910263904A CN109899987B CN 109899987 B CN109899987 B CN 109899987B CN 201910263904 A CN201910263904 A CN 201910263904A CN 109899987 B CN109899987 B CN 109899987B
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Abstract
The invention relates to a heat exchanger, which comprises an inner cylinder body with openings at two ends, wherein a spiral heat exchange tube spirally extending along the axial direction of the inner cylinder body is arranged in the inner cylinder body and fixedly connected to the inner wall of the inner cylinder body, one end of the inner cylinder body is a first inlet, the other end of the inner cylinder body is a first outlet, two ends of the spiral heat exchange tube respectively extend out of the inner cylinder body from the side wall of the inner cylinder body, one end of the spiral heat exchange tube is a second inlet, the other end of the spiral heat exchange tube is a second outlet, a large number of fins extending towards the central shaft direction of the spiral heat exchange tube are sequentially connected to the spiral heat exchange tube along the axial direction of the spiral heat exchange tube, the fins are twisted from the position separated from the spiral heat exchange tube, and the angle formed by. On the basis of improving the heat exchange efficiency through the fins, the medium outside the tube is further guided to form spiral flow through the twisting of the fins, and the heat exchange efficiency is further improved.
Description
Technical Field
The invention belongs to the technical field of heat exchange, and particularly relates to a heat exchanger.
Background
The energy is ubiquitous in nature, the common phenomenon is wind, and the size of the wind represents the speed of energy flow and the speed of energy high-end propagation. When the airflow with relatively high temperature meets the airflow with low temperature, the airflow can generate intense heat exchange to form tornado, and a large number of gas molecules which rotate spirally accelerate the heat exchange through high-speed friction conduction. Besides the gas, there are also liquids, such as vortexes in rivers, lakes and seas, which are another energy flow exchange of morphological potential energy. The electrical transformer and the motor realize energy conversion in the form of electromagnetic field by spiral coils. Indirectly illustrating that energy conversion in the form of a helix is a better approach.
The volume of the high-temperature gas that the burning produced is directly proportional with this high-temperature gas's temperature, and the temperature is higher, and the volume is big more, if the high-temperature gas's after the burning temperature can not obtain timely reduction, then can influence the entering of the air that is used for the burning, and will keep the necessary air input of burning, fan power consumption can improve, and the air input is not enough can lead to the burning incomplete, the extravagant energy.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided is a heat exchanger capable of improving heat exchange efficiency.
In order to solve the technical problems, the invention adopts the technical scheme that: the heat exchanger comprises a spiral heat exchange tube, a large number of fins extending towards the central axis direction of the spiral heat exchange tube are sequentially connected to the spiral heat exchange tube along the axial direction of the spiral heat exchange tube, each fin comprises a connecting portion connected with the spiral heat exchange tube and a heat exchange portion connected to the connecting portion and extending towards the central axis of the spiral heat exchange tube, one end of the spiral heat exchange tube is an upper end, the other end of the spiral heat exchange tube is a lower end, the fin heat exchange portion located at the end portion of the lower end of the spiral heat exchange tube is parallel to the central axis of the spiral heat exchange tube, the heat exchange portions of the fins which are sequentially arranged upwards along the spiral heat exchange tube from the fins are inclined along the same direction and then form an inclination angle theta with the central axis.
As a preferred scheme, the heat exchanger further comprises an inner barrel arranged outside the spiral heat exchange tube, the central shaft of the spiral heat exchange tube is parallel to the axial direction of the inner barrel, two ends of the inner barrel are open, one end of the inner barrel is a first inlet, the other end of the inner barrel is a first outlet, two ends of the spiral heat exchange tube respectively extend out of the inner barrel from the side wall of the inner barrel, one end of the spiral heat exchange tube is a second inlet, the other end of the spiral heat exchange tube is a second outlet, and the lower end of the spiral heat exchange tube is located at the.
As an optimal scheme, the heat exchange parts of the fins are bent towards one end of a central shaft of the spiral heat exchange tube along a folding line inclined to the central shaft to form a guide part, the angle formed by the folding line and the central shaft is 0-45 degrees, and any folding line is gradually inclined towards the connecting parts of the fins along the direction from the first inlet to the first outlet.
Preferably, the angle formed by the folding line and the central axis is gradually increased from the first inlet end to the first outlet end of the inner cylinder.
As a preferable scheme, inner fins spirally extending along the axial direction of the spiral heat exchange tube are arranged on the inner wall of the spiral heat exchange tube.
As a preferred scheme, a gap is reserved between the spiral heat exchange tube and the inner wall of the inner cylinder, a plurality of spirally arranged positioning frames are dispersedly arranged on the inner cylinder, and the spiral heat exchange tube is arranged on the positioning frames and is fixedly connected with the inner wall of the inner cylinder through the positioning frames.
As a preferred scheme, an outer barrel is sleeved outside the inner barrel, a first outlet end of the inner barrel is positioned in the outer barrel, one end of the outer barrel, corresponding to the first outlet end of the inner barrel, is connected with a hollow box body, a plurality of feeding through holes are formed in the box wall of the box body, which is opposite to the first outlet, discharging through holes which are in one-to-one correspondence with the feeding through holes are formed in other box walls of the box body, heat exchange tubes which are in one-to-one correspondence with the feeding through holes are arranged in the box body, one ends of the heat exchange tubes are in sealing butt joint with the corresponding feeding through holes, the other ends of the heat exchange tubes are in one-to-one correspondence to the discharging through holes, a discharging port and a feeding port are arranged on the outer wall of the box body, the discharging port is positioned on the side wall far away from one end of the first outlet, an annular gap is formed between the first outlet end of the inner barrel and the box body, condensed water enters the condensed water tank from the annular gap, and a condensed water pipe communicated with the condensed water tank is arranged on the outer wall of the outer barrel.
As a preferred scheme, the inner cylinder and the outer cylinder are vertically arranged, the box body is arranged at the upper end of the outer cylinder, a guide plate which is upwards supplied is arranged above the inner cylinder, and the lower edge of the guide plate is positioned right above the condensate water tank.
Preferably, the inner wall and the outer wall of the heat exchange tube are respectively connected with an inner fin and an outer fin which spirally extend along the axial direction of the heat exchange tube.
As a preferred scheme, the spiral heat exchange tube is vertically arranged, and only the fins on the lower half part of the spiral heat exchange tube are provided with the guide parts.
The invention has the beneficial effects that: the spiral heat exchange tube is provided with the fins, the contact area between the spiral heat exchange tube and the outside is increased, the heat exchange efficiency is improved, the heat exchange parts of the fins sequentially arranged along the spiral heat exchange tube upwards are inclined along the same direction and form an inclination angle theta with the central shaft after being inclined, the value of theta is kept unchanged at 45 degrees after being gradually increased upwards to 45 degrees from the lower end of the spiral heat exchange tube, so that a medium passing through the fins of the spiral heat exchange tube gradually forms spiral flow, the concentration of the medium near the spiral heat exchange tube is increased under the action of centrifugal force, and the medium is fully contacted with the spiral heat exchange tube to improve the heat exchange efficiency.
The spiral heat exchange tube is arranged in the inner cylinder, the fins are arranged on the spiral heat exchange tube, and meanwhile, the angle formed by the surfaces of the fins and the central shaft is gradually increased from the first inlet end to the first outlet end of the inner cylinder, so that when a medium just enters the heat exchanger, the medium is basically not blocked by the fins and can quickly enter the heat exchanger to be in contact with the fins and the spiral heat exchange tube.
Description of the drawings:
the following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a schematic view of a half-section of the present invention;
FIG. 2 is a view taken in the direction A of FIG. 1;
FIG. 3 is a schematic perspective view of a fin;
FIG. 4 is a schematic view showing the structural relationship between the upper and lower fins and the central shaft;
FIG. 5 is a schematic view of a half-section of a heat exchanger with an arched bottom surface of the tank;
fig. 6 is a schematic structural diagram of another embodiment of the present invention.
In FIGS. 1 to 6: 1. the heat exchanger comprises an inner cylinder, 2, spiral heat exchange tubes, 3, a first inlet, 4, a first outlet, 5, a second inlet, 6, a second outlet, 7, a central shaft, 8, fins, 8-1, a connecting part, 8-2, a heat exchange part, 9, an outer cylinder, 10, a folding line, 11, a guide part, 12, inner fins, 13, a box body, 14, a feeding through hole, 15, a discharging through hole, 16, heat exchange tubes, 17, a discharge port, 18, a feed inlet, 19, outer fins, 20, a positioning frame, 21, a condensed water tank, 22, an annular gap, 23, a condensed water pipe, 24, a guide plate, 25, a gap, 26, an isolating ring, 27, a connecting rib, 28 and a circulation hole.
The specific implementation mode is as follows:
specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1:
the heat exchanger shown in fig. 1 to 4 comprises a spiral heat exchange tube 2, a plurality of fins 8 extending towards the central axis 7 of the spiral heat exchange tube 2 are sequentially connected to the spiral heat exchange tube 2 along the axial direction of the spiral heat exchange tube, each fin 8 comprises a connecting part 8-1 connected with the spiral heat exchange tube 2 and a heat exchange part 8-2 connected to the connecting part 8-1 and extending towards the central axis 7 of the spiral heat exchange tube 2, one end of the spiral heat exchange tube 2 is an upper end, the other end of the spiral heat exchange tube 2 is a lower end, a fin 8 heat exchange part 8-2 positioned at the lower end part of the spiral heat exchange tube 2 is parallel to a central shaft 7 of the spiral heat exchange tube 2, the heat exchange parts 8-2 of all fins 8 which are sequentially arranged from the fins 8 upwards along the spiral heat exchange tube 2 are inclined along the same direction, an inclination angle theta is formed between the inclined parts and the central shaft 7, and the value of theta is kept unchanged after the value of theta is gradually increased to 45 degrees upwards from the lower end of the spiral heat exchange tube 2.
As shown in fig. 3, the fin 8 in this embodiment is formed by rolling and twisting a strip-shaped plate, the strip-shaped plate is formed by rolling one end of the strip-shaped plate to form a circular ring-shaped connecting portion 8-1 which is matched with the outer circumference of the spiral heat exchange tube 2, and is sleeved on the spiral heat exchange tube 2, and the fin 8 is twisted from the position where the rolling is finished to form the heat exchange portion 8-2.
The heat exchanger still includes vertical setting and both ends open-ended interior barrel 1, and in barrel 1 including 1 axial settings of barrel in the spiral heat exchange tube 2 edge, 1 inner wall of barrel in spiral heat exchange tube 2 fixed connection, 1 one end of interior barrel is first import 3, and the other end is first export 4, outside barrel 1 stretched out on 1 lateral wall of interior barrel in the both ends of spiral heat exchange tube 2 are followed respectively, the one end of spiral heat exchange tube 2 was second import 5, and the other end is second export 6, and spiral heat exchange tube lower extreme is located 1 first import 3 ends of barrel.
The spiral heat exchange tube 2 is arranged in the inner cylinder 1, the fins 8 are arranged on the spiral heat exchange tube 2, and simultaneously, the angle theta formed by the surfaces of the fins 8 and the central shaft 7 is gradually increased from the first inlet 3 end to the first outlet 4 end of the inner cylinder 1, so when a medium enters the inner cylinder 1 of the heat exchanger, the medium is basically not blocked by the fins 8 and can quickly enter into contact with the fins 8 and the spiral heat exchange tube 2, the temperature of the medium (hereinafter, referred to as an external medium) which just enters the inner cylinder 1 of the heat exchanger is greatly different from the temperature of the medium inside the spiral heat exchange tube 2, the heat exchange efficiency is high, the temperature gradually decreases while the external medium gradually increases, the gradual inclination of the fins 8 enables the external medium to gradually rotate spirally and rise, the rotating speed is faster as the external medium rotates, and the medium in the central area of the inner cylinder 1 is dispersed to the, fully contacts with the spiral heat exchange tube, and improves the heat exchange efficiency.
As shown in fig. 1, one end of the heat exchanging portion 8-2 of the plurality of fins 8 facing the central axis 7 of the spiral heat exchanging tube 2 is bent along a folding line 10 inclined to the central axis 7 to form a guide portion 11, an angle formed by the folding line 10 and the central axis 7 is 0 to 45 °, and any folding line 10 is gradually inclined toward the connecting portion 8-1 of the fin 8 along the direction from the first inlet 3 to the first outlet 4.
The angle formed by the folding line 10 and the central shaft 7 is gradually increased from the first inlet 3 end of the inner cylinder 1 to the first outlet 4 end.
The guide parts 11 are arranged on the fins, so that the medium outside the tube can move upwards to have kinetic energy moving towards the direction of the spiral heat exchange tube 2, the spiral heat exchange tube 2 is impacted, and the heat exchange efficiency of the medium outside the tube and the medium inside the spiral heat exchange tube 2 is improved.
The inner wall of the spiral heat exchange tube 2 is provided with inner fins 12 which spirally extend along the axial direction of the spiral heat exchange tube 2. The inner fins 12 can improve the heat exchange efficiency of the spiral heat exchange tube 2 and the water inside the spiral heat exchange tube, thereby further improving the absorption efficiency of the whole heat exchanger on hot gas energy.
A gap 25 is reserved between the spiral heat exchange tube 2 and the inner wall of the inner barrel 1, a plurality of spirally arranged positioning frames 20 are arranged on the inner barrel 1 in a scattered manner, and the spiral heat exchange tube 2 is arranged on the positioning frames 20 and is fixedly connected with the inner wall of the inner barrel 1 through the positioning frames 20. The medium outside the tube can flow through the gap 25, so that the medium is fully wrapped around the spiral heat exchange tube 2 and fully contacted with the spiral heat exchange tube 2 to improve the heat exchange efficiency.
An outer barrel 9 is sleeved outside the inner barrel 1, the first outlet 4 end of the inner barrel 1 is positioned in the outer barrel 9, one end of the outer barrel 9 corresponding to the first outlet 4 end of the inner barrel 1 is connected with a hollow box body 13, a plurality of feeding through holes 14 are arranged on the box wall of the box body 13 facing the first outlet 4, discharging through holes 15 corresponding to the feeding through holes 14 in a one-to-one manner are arranged on other box walls of the box body 13, heat exchange tubes 16 corresponding to the feeding through holes 14 in a one-to-one manner are arranged inside the box body 13, one end of each heat exchange tube 16 is in sealing butt joint with the corresponding feeding through hole 14, the other end of each heat exchange tube is in sealing connection with the discharging through hole 15 in a one-to-one manner, a discharging opening 17 and a feeding opening 18 are arranged on the outer wall of the box body 13, the discharging opening 17 is positioned on the side wall far away from one end of the first, a condensate water tank 21 is formed between the inner cylinder body 1 and the outer cylinder body, an annular gap 22 is formed between the first outlet 4 end of the inner cylinder body 1 and the box body 13, condensate water enters the condensate water tank 21 from the annular gap 22, and a condensate water pipe 23 communicated with the condensate water tank 21 is arranged on the outer wall of the outer cylinder body 9.
As shown in fig. 1, the inner cylinder 1 and the outer cylinder 9 are connected at intervals through a separation ring 26, the separation ring 26 is close to the first inlet 3 of the inner cylinder 1, a plurality of vertically extending connection ribs 27 are arranged at intervals in the circumferential direction in the condensed water tank 21 above the separation ring 26, and the inner cylinder 1 and the outer cylinder 9 are connected with each other through the connection ribs 27.
After the spiral heat exchange tubes 2 exchange heat between the medium outside the tubes and the medium inside the tubes, the heat exchange is performed again through the box body 13, so that the sufficient heat exchange of the two media is realized.
The spiral heat exchange tube 2 is vertically arranged, the guide parts 11 are only arranged on the fins 8 on the lower half part of the spiral heat exchange tube 2, and the medium outside the tube is guided by the guide parts 11 on the lower half part of the spiral heat exchange tube 2, impacted towards the inner wall of the inner cylinder 1 and the spiral heat exchange tube 2, and then reflected towards the upper half part of the spiral heat exchange tube 2, so that the medium outside the tube smoothly and uniformly enters each heat exchange tube 16.
The inner cylinder 1 and the outer cylinder 9 are both vertically arranged, the box body 13 is arranged at the upper end of the outer cylinder 9, a guide plate 24 which is upwards supplied is arranged above the inner cylinder 1, the lower edge of the guide plate 24 is positioned right above the condensate water tank 21, in the embodiment, the guide plate 24 is inversely hung at the bottom of the box body 13, and certainly, the guide plate 24 can be fixedly connected to the upper end of the inner cylinder 1 or the inner wall of the outer cylinder 9 through a support column.
The guide plate 24 guides the formed condensed water when the medium outside the pipe is high-temperature gas, and guides the condensed water into the condensed water tank 21 and discharges the condensed water through the condensed water tank 23.
In order to improve the circulation efficiency of the gas medium, the guide plate 24 is provided with circulation holes 28 which are staggered with the feed through hole 14.
The inner wall and the outer wall of the heat exchange tube 16 are respectively connected with an inner fin 12 and an outer fin 19 which extend spirally along the axial direction of the heat exchange tube, so that the heat exchange area is further enlarged, and the heat exchange efficiency of two media is improved.
The working principle of the invention is explained in detail by taking the case that the medium outside the pipe is high-temperature hot gas and the medium inside the pipe is low-temperature water level: as shown in fig. 1 to 4, the lower end of the outer cylinder 9 is abutted to a combustion chamber (not shown in the figures), so that hot gas generated by combustion in the combustion chamber enters the inner cylinder 1 through the first inlet 3 of the inner cylinder 1 and flows along the inner cylinder 1 toward the first outlet 4.
Cold water is injected into the box body 13 from the feed port 18, the cold water flows into the spiral heat exchange tube 2 from the discharge port 17 through the second inlet 5, flows downwards along the spiral heat exchange tube 2 to the second outlet 6 to be discharged, and the discharged water can be conveyed to the feed port 18 again to form circulation or can be directly used.
At the initial stage that hot gas enters the inner barrel body 1 from the first inlet 3, the circulation is not obstructed, the hot gas is upward at a high speed and is in contact with the fins 8 and the spiral heat exchange tubes 2 to carry out efficient heat exchange, in the upward flowing process of the hot gas, the hot gas is blocked by the surfaces of the gradually inclined fins 8 and starts to gradually rise spirally and is guided by the guide parts 11, the concentration of the hot gas in the central area (near the central shaft 7) of the spiral heat exchange tubes 2 is reduced, the concentration of the hot gas in the periphery (near the spiral heat exchange tubes) is increased, and the hot gas is fully subjected to.
The hot gas enters the heat exchange tube 16 for further cooling after passing through the spiral heat exchange tube 2, condensed water is formed on the inner wall of the heat exchange tube 16, the condensed water flows downwards along the inner wall of the heat exchange tube 16 and drips on the flow guide plate 24, flows around the flow guide plate 24 along the arc surface of the flow guide plate 24, finally drips from the peripheral edge of the flow guide plate 24 into the condensed water tank 21 and is discharged through the condensed water tube 23, and the influence on the combustion of the gas in the combustion chamber is avoided.
According to the invention, the fins are arranged on the spiral heat exchange tube 2, the fins are used for carrying out heat exchange with hot gas, the heat exchange area is increased, so that the heat exchange efficiency is improved, the arrangement mode that the fins 8 are gradually inclined from the first inlet to the first outlet is utilized, the hot gas spirally rises, the spiral heat exchange with the spiral heat exchange tube 2 is formed, and the heat exchange efficiency is improved.
In this embodiment, the diversion plate 24 may be a single hemispherical plate connected below the box 13 as shown in fig. 1, or the bottom surface (the surface facing the first outlet 4) of the box 13 may be an arched bottom as shown in fig. 5, which is arched upward, so that the lower bottom surface of the box 13 has a diversion function to guide the condensed water formed in the bottom surface of the box 13 and the heat exchange tubes 16 to be collected in the condensed water tank 21.
Example 2:
as shown in fig. 6, the heat exchanger of the present embodiment comprises a spiral heat exchange tube 2, a plurality of fins 8 extending in the direction of the central axis 7 of the spiral heat exchange tube 2 are sequentially connected to the spiral heat exchange tube 2 along the axial direction thereof, each fin 8 comprises a connecting portion 8-1 connected to the spiral heat exchange tube 2 and a heat exchanging portion 8-2 connected to the connecting portion 8-1 and extending to the central axis 7 of the spiral heat exchange tube 2, one end of the spiral heat exchange tube 2 is an upper end, the other end of the spiral heat exchange tube 2 is a lower end, a fin 8 heat exchange part 8-2 positioned at the lower end part of the spiral heat exchange tube 2 is parallel to a central shaft 7 of the spiral heat exchange tube 2, the heat exchange parts 8-2 of all fins 8 which are sequentially arranged from the fins 8 upwards along the spiral heat exchange tube 2 are inclined along the same direction, an inclination angle theta is formed between the inclined parts and the central shaft 7, and the value of theta is kept unchanged after the value of theta is gradually increased to 45 degrees upwards from the lower end of the spiral heat exchange tube 2.
The spiral heat exchange tube 2 in this embodiment is also provided with inner fins 12 inside to increase the heat exchange area inside the tube.
In this embodiment, also can set up barrel 1 in spiral heat exchange tube 2 outside, restrict the flow direction to the medium outside the geminate transistors, spiral heat exchange tube 2 and interior barrel 1 can transversely set up, also can vertically set up, all do not influence the use.
The working principle of the heat exchanger in the embodiment is as follows: high-temperature gas or liquid is introduced into the spiral heat exchange tube 2, and then heat exchange is carried out between the high-temperature gas or liquid and low-temperature gas or liquid outside the tube through the fins 8, the structure of the fins 8 in the embodiment is the same as that in the embodiment 1, in actual use, the low-temperature gas or liquid outside the tube is blown upwards from the lower end of the spiral heat exchange tube 2, so that the gas or liquid outside the tube passes through the middle of the spiral heat exchange tube 2 and forms spiral flow under the action of the fins 8, and the low-temperature gas or liquid outside the tube is in full contact with the spiral heat exchange tube 2, so that.
The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
Claims (10)
1. The heat exchanger is characterized by comprising a spiral heat exchange tube (2), a large number of fins (8) extending towards the direction of a central shaft (7) of the spiral heat exchange tube (2) are sequentially connected to the spiral heat exchange tube (2) along the axial direction of the spiral heat exchange tube, each fin (8) comprises a connecting part (8-1) connected with the spiral heat exchange tube (2) and a heat exchange part (8-2) connected to the connecting part (8-1) and extending towards the central shaft (7) of the spiral heat exchange tube (2), one end of the spiral heat exchange tube (2) is an upper end, the other end of the spiral heat exchange tube is a lower end, the heat exchange parts (8-2) of the fins (8) positioned at the lower end part of the spiral heat exchange tube (2) are parallel to the central shaft (7) of the spiral heat exchange tube (2), the heat exchange parts (8-2) of the fins (8) sequentially arranged upwards along the spiral heat exchange tube (2) from the fins (8) are inclined, the value of theta is kept unchanged after the value of theta is gradually increased to 45 degrees from the lower end of the spiral heat exchange tube (2) upwards.
2. The heat exchanger according to claim 1, characterized by further comprising an inner cylinder (1) arranged outside the spiral heat exchange tube, wherein the central axis (7) of the spiral heat exchange tube (2) is parallel to the axial direction of the inner cylinder (1), two ends of the inner cylinder (1) are open, one end of the inner cylinder (1) is provided with a first inlet (3), the other end of the inner cylinder is provided with a first outlet (4), two ends of the spiral heat exchange tube (2) respectively extend out of the inner cylinder (1) from the side wall of the inner cylinder (1), one end of the spiral heat exchange tube (2) is provided with a second inlet (5), the other end of the spiral heat exchange tube is provided with a second outlet (6), and the lower end of the spiral heat exchange tube is positioned at the first inlet (.
3. The heat exchanger according to claim 2, characterized in that one end of the heat exchanging portion (8-2) of the plurality of fins (8) facing the central axis (7) of the spiral heat exchanging tube (2) is bent along a folding line (10) inclined to the central axis (7) to form a guide portion (11), an angle formed by the folding line (10) and the central axis (7) is 0-45 °, and any folding line (10) is gradually inclined toward the connecting portion (8-1) of the fin (8) along the first inlet (3) toward the first outlet (4).
4. A heat exchanger according to claim 3, characterised in that the angle formed by the crease line (10) and the central axis (7) increases from the first inlet (3) end to the first outlet (4) end of the inner cylinder (1).
5. A heat exchanger according to claim 4 wherein the inner wall of the spiral heat exchange tube (2) is provided with inner fins (12) extending spirally in the axial direction of the spiral heat exchange tube (2).
6. The heat exchanger according to claim 2, characterized in that a gap (25) is reserved between the spiral heat exchange tube (2) and the inner wall of the inner cylinder (1), a plurality of spirally arranged positioning frames (20) are arranged on the inner cylinder (1) in a scattered manner, and the spiral heat exchange tube (2) is arranged on the positioning frames (20) and is fixedly connected with the inner wall of the inner cylinder (1) through the positioning frames (20).
7. The heat exchanger according to any one of claims 2 to 6, characterized in that an outer cylinder (9) is sleeved outside the inner cylinder (1), the first outlet (4) end of the inner cylinder (1) is positioned inside the outer cylinder (9), one end of the outer cylinder (9) corresponding to the first outlet (4) end of the inner cylinder (1) is connected with a hollow box (13), a plurality of feeding through holes (14) are formed in the box wall of the box (13) facing the first outlet (4), discharging through holes (15) corresponding to the feeding through holes (14) one by one are formed in the other box walls of the box (13), heat exchanging pipes (16) corresponding to the feeding through holes (14) are arranged inside the box (13), one ends of the heat exchanging pipes (16) are in sealed butt joint with the corresponding feeding through holes (14), the other ends are in sealed connection with the discharging through holes (15) one by one, a discharging port (17) and a feeding port (18) are arranged on the outer wall of the box (13), bin outlet (17) are located the lateral wall of keeping away from first export (4) one end, and feed inlet (18) are located the lateral wall that is close first export (4) one end, second export (6) and feed inlet (18) intercommunication of spiral heat exchange tube (2), form condensate trough (21) between interior barrel (1) and the outer barrel, form annular breach (22) between interior barrel (1) first export (4) end and box (13), the condensate water gets into condensate trough (21) from annular breach (22) in, be provided with condensate pipe (23) with condensate trough (21) intercommunication on outer barrel (9) outer wall.
8. The heat exchanger according to claim 7, characterized in that the inner cylinder (1) and the outer cylinder (9) are vertically arranged, the box body (13) is arranged at the upper end of the outer cylinder (9), an upward-supplying guide plate (24) is arranged above the inner cylinder (1), and the lower edge of the guide plate (24) is positioned right above the condensate water tank (21).
9. The heat exchanger according to claim 7, wherein inner and outer walls of the heat exchanging tube (16) are respectively connected with inner and outer fins (12, 19) spirally extending along an axial direction thereof.
10. A heat exchanger according to claim 7, characterized in that the spiral heat exchange tubes (2) are vertically arranged, and the fins (8) on only the lower half of the spiral heat exchange tubes (2) are provided with guides (11).
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| CN204902626U (en) * | 2015-05-06 | 2015-12-23 | 华北电力大学（保定） | Energy -conserving radiator with higher heat exchange efficiency |
| CN105571356A (en) * | 2016-01-18 | 2016-05-11 | 太原理工大学 | Rib/spiral piece combined double-pipe heat exchanger |
| CN108981441A (en) * | 2018-05-08 | 2018-12-11 | 哈尔滨工业大学 | Variable-pitch screw tie thermoexcell based on the combination of close and distant water surface |
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