CN203454859U - Novel laminated sheet type longitudinal flow heat exchanger - Google Patents
Novel laminated sheet type longitudinal flow heat exchanger Download PDFInfo
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- CN203454859U CN203454859U CN201320504974.4U CN201320504974U CN203454859U CN 203454859 U CN203454859 U CN 203454859U CN 201320504974 U CN201320504974 U CN 201320504974U CN 203454859 U CN203454859 U CN 203454859U
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Abstract
The utility model discloses a novel laminated sheet type longitudinal flow heat exchanger which comprises a shell, heat exchange pipes, a left pipe plate, a right pipe plate and laminated sheets, wherein the left pipe plate and the right pipe plate are arranged at two ends of the shell; the laminated sheets are arranged in the shell and are sleeved on the heat exchange pipes at intervals in parallel; the laminated sheets enable heat exchange pipe holes to be in tight contact with the heat exchange pipes in a manner of integrally expanding the pipes; the left pipe plate is connected with a water inlet cover with a water inlet and a water outlet through a bolt; the right pipe plate is connected with a water returning cover through a bolt; a shell-side fluid inlet and a shell-side fluid outlet are also formed above or below two ends of the shell; a leakage opening is formed in the bottom of the shell; longitudinal flow holes capable of enabling shell-side fluid which enters from the shell-side fluid inlet to longitudinally flow to the shell-side fluid outlet along the axial direction of the heat exchanger are formed in the laminated sheets; certain spaces are formed in two ends of a shell side to enable the shell-side fluid to uniformly flow in and flow out. The novel laminated sheet type longitudinal flow heat exchanger has a simple technology, is low in cost, compact in structure, high in efficiency, high in pressure bearing capacity and wide in application range, and the heat transmission area of a unit volume is enlarged.
Description
Technical field
The utility model relates to a kind of stacked heat exchanger, especially shell-side fluid and adopts longitudinal streaming to reduce the complex heat transfer performance of droop loss and the raising heat exchanger shell pass of heat exchanger shell pass.
Background technology
Heat exchanger is being widely used of a kind of important unit, especially shell-and-tube heat exchanger in the industry such as oil refining, chemical industry, environmental protection, the energy, electric power.Conventional tube shell heat exchanger is used segmental baffle as supporting between pipe, and fluid cross is washed away tube bank, easily produces induced vibration, has flow dead, and shell-side pressure drop loss is large.Characteristics of heat transfer based on pipe shell type heat exchange, a lot of scholars are studied with the outer augmentation of heat transfer technology of pipe its pipe is interior, and acquire a great achievement.For Study of Intensification, research mainly concentrates on two aspects: the surface texture that changes on the one hand heat exchanger tube carries out augmentation of heat transfer, as screwed pipe, finned tube, studded tube etc.; Change on the other hand the supporting way of heat exchanger tube, thereby improve the object that the mobile form of shell-side fluid and distribution etc. reach augmentation of heat transfer, as spiral baffle supporting structure, rod baffle structure, disc-annular shape supporting construction, reticulate perforation plate supporting construction etc.
Stacked heat exchanger is mainly used in the aspects such as Air-conditioning Engineering, Refrigeration Engineering, belongs to fin-tube heat exchanger one class.General stacked heat exchanger adopts monoblock perforate rectangle lamination mostly, and lamination size is large, and heat exchanger tube adopts U-shaped mode to connect, and without housing, extratubal fluid is generally air, cross-flow tube bank.Although heat exchange area is large, heat exchanger tube adopts U-shaped mode to connect technique and manufactures complexity, and heat exchanger volume is large and be generally rectangular structure, is only adapted to the occasion of mesolow.Also there is at present patent to adopt the shell-and-tube heat exchanger of lamination and segmental baffle combining form, shell-side fluid is cross-flow form and flows, but because lamination spacing is little, quantity is many, therefore heat exchanger shell pass pressure drop is large, can only in low discharge scope or range of small, use very much, and lamination need to cut out baffling district, greatly reduce the utilization rate of material, thereby it is high to have limited stacked heat exchanger heat exchange efficiency, the advantage that volume is little.
Utility model content
For the problem of above-mentioned existence, the utility model is intended to solve the problems of the technologies described above to a certain extent.
The utility model object is to overcome the shortcoming and defect part of above-mentioned prior art, a kind of laminated grain longitudinal stream heat exchanger and intensified heat transfer method thereof are provided, it is by perforate on lamination, realize shell-side fluid longitudinal flow, during the described perforate of shell-side fluid process, produce jet, strengthen the turbulence intensity of shell-side fluid, to realize augmentation of heat transfer.And shell-side fluid, in heat exchange tube interfascicular longitudinal flow, can reduce shell-side pressure drop.
The utility model solves the technical scheme that its technical problem adopts:
A kind of laminated grain longitudinal stream heat exchanger, comprise housing, heat exchanger tube, be welded on left tube sheet and the right tube sheet at housing two ends, be arranged in housing and the every lamination being enclosed within abreast on heat exchanger tube of the certain interval of being separated by, described lamination makes heat exchange pore and heat exchanger tube close contact by whole expand tube, described left tube sheet is bolted the water inlet lid with water inlet and delivery port, described right tube sheet is bolted water return cover, above or below housing two ends, be also provided with shell-side fluid import and shell-side fluid outlet, housing bottom is provided with leakage hole, on described lamination, offer longitudinal discharge orifice that the shell-side fluid that makes to flow into from shell-side fluid import exports along heat exchanger axial direction longitudinal flow to shell-side fluid, housing two ends are also provided with certain space, so that shell-side fluid is uniformly distributed between lamination, effectively improve the convection heat transfer' heat-transfer by convection of heat exchanger.
Further, the cross-sectional profiles of described lamination and housing (8) can be circle or rectangle.
Further, the heat exchange pore on described lamination can adopt triangle stringing, square stringing or 45 ° of stringings of transposition.
Further, the shape of the longitudinal discharge orifice on described lamination can be circle, square, rectangle or spline shape.
Further, rounded longitudinal the diameter of flowing hole is 0.3 ~ 0.42 with the ratio of heat exchanger tube overall diameter during triangle stringing; When square stringing or 45 ° of stringings of transposition, rounded longitudinal the diameter of flowing hole is 0.4 ~ 0.72 with the ratio of heat exchanger tube overall diameter.
Further, longitudinally the inscribed circle diameter of discharge orifice and the ratio of heat exchanger tube overall diameter are 0.3 ~ 0.42 to triangle stringing time square; When square stringing or 45 ° of stringings of transposition, the longitudinal inscribed circle diameter of discharge orifice of square and the ratio of heat exchanger tube overall diameter are 0.4 ~ 0.72.
Further, when on lamination, heat exchange pore centre-to-centre spacing is greater than 1.5 with heat exchanger tube external diameter ratio, the quantity of the longitudinal discharge orifice of rectangle on described lamination between adjacent heat exchange tubes hole is 3 ~ 6, and length-width ratio is 2 ~ 6, and longitudinally discharge orifice can be vertically or horizontal positioned; When on lamination, heat exchange pore centre-to-centre spacing is less than 1.5 with heat exchanger tube external diameter ratio, the quantity of the longitudinal discharge orifice of rectangle on lamination between adjacent heat exchange tubes hole is 1 ~ 2, and length-width ratio is 2 ~ 4.
Further, the longitudinal discharge orifice circumscribed circle diameter of spline shape is 0.3 ~ 0.42 with the ratio of heat exchanger tube overall diameter during triangle stringing; When square stringing or 45 ° of stringings of transposition, the circumscribed circle diameter of the longitudinal discharge orifice of spline shape is 0.4 ~ 0.72 with the ratio of heat exchanger tube overall diameter.
Further, described laminate can adopt fine aluminium, aluminium alloy, copper alloy and stainless steel, and lamination spacing is 1.5 ~ 6mm.
Further, described heat exchanger is monoshell journey, and tube side can be a journey, two journeys or quadruple pass; Described heat exchanger can carry out horizontal and vertical installation.
This heat exchanger comprises circular shell, circular cross-section lamination, heat exchanger tube and entery and delivery port; Also can adopt square-section housing, square-section lamination, heat exchanger tube and entery and delivery port.
On described lamination, except heat exchange pore, also open multi-form longitudinal discharge orifice, longitudinal discharge orifice of shell-side fluid along heat exchanger axial direction from lamination, flow through, realized longitudinal flow.Lamination and heat exchanger tube are linked as integral body by expanded joint mode, and are placed in housing, and centre does not have deflection plate to support.
The high temperature fluid of described stacked longitudinal stream heat exchanger enters housing from shell-side fluid import, and multi-form longitudinal discharge orifice of opening by lamination is realized longitudinal flow, then from shell-side fluid outlet, flows out; Water at low temperature flows into heat exchanger tube from water inlet, in water return cover, after coming and going the number of passes of stipulating, from delivery port, is flowing out, and high temperature fluid heat release reduces temperature, and water at low temperature absorbs heat temperature and raises, and reaches heat transfer effect.Shell side high temperature fluid is longitudinal stream mistake from longitudinal discharge orifice of lamination, compares with stacked cross-flow heat exchanger, and under the same terms, pressure drop is little.
Shell-side fluid flows through from lamination perforate along heat exchanger axial direction, realizes longitudinal flow; Due to the sudden change of circulation area, during longitudinal discharge orifice of shell-side fluid process lamination, produce jet, strengthened flow disturbance; Again because the lamination certain interval of being separated by is enclosed within on heat exchanger tube, so shell-side fluid can periodically produce jet, constantly strengthens the whole turbulence intensity of shell-side fluid, thereby improved greatly the film coefficient of heat transfer of shell side, strengthened shell side heat transfer.
Advantage of the present utility model and beneficial effect are: heat exchanger shell pass fluid, in lamination intercropping longitudinal flow, can reduce shell-side pressure drop; Shell-side fluid produces jet while passing through longitudinal discharge orifice multi-form on lamination, thereby strengthens the periodic disturbance of shell-side fluid, improves shell side film coefficient of heat transfer, augmentation of heat transfer; Lamination adopts whole punch forming manufacture, and compares with existing stacked cross-flow heat exchanger, and this lamination need not cut out arc baffling district, technique is simple, saves material, and laminate utilization rate improves, the heat transfer area of unit volume increases, and structure is compact efficient more; For housing, be this heat exchanger of circular cross-section form, its voltage endurance capability is strong, and the scope of application is wider.
Accompanying drawing explanation
The structural representation that Fig. 1 is the utility model embodiment mono-shell side cross section when circular.
Fig. 2 is part plan schematic diagram during the longitudinal discharge orifice of lamination opened round in Fig. 1.
Fig. 3 is that the utility model embodiment bis-laminations are opened longitudinally part plan schematic diagram during discharge orifice of square.
Fig. 4 is that on the utility model embodiment tri-laminations, heat exchanger tube perforate centre-to-centre spacing is left rectangular longitudinal at 1.5 o'clock to the part plan schematic diagram of discharge orifice with heat exchanger tube external diameter than being less than.
Fig. 5 is that on the utility model embodiment tetra-laminations, heat exchanger tube perforate centre-to-centre spacing is left rectangular longitudinal at 1.5 o'clock to the part plan schematic diagram of discharge orifice with heat exchanger tube external diameter than being greater than.
Fig. 6 is the bloom part plan schematic diagram of the longitudinal discharge orifice of key shape of the lamination of the utility model embodiment five.
Fig. 7 is the structural representations of the utility model embodiment six shell side cross sections while being rectangle.
Shown in figure, be: 1. delivery port, 2. water inlet, 3. water inlet lid, 4. left tube sheet, 5. shell-side fluid import, 6. lamination, 61. heat exchange pores, 62. longitudinal discharge orifices, 7. heat exchanger tube, 8. housing, 9. shell-side fluid exports, 10. right tube sheet, 11. water return covers, 12. leakage holes.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment mono-
As shown in Figures 1 and 2, a kind of laminated grain longitudinal stream heat exchanger, comprise housing 8, heat exchanger tube 7, be welded on left tube sheet 4 and the right tube sheet 10 at housing 8 two ends, be arranged in housing 8 and every of the certain interval of being separated by is enclosed within the lamination 6 on heat exchanger tube 7 abreast, described lamination 6 makes heat exchange pore 61 and heat exchanger tube 7 close contacts by whole expand tube, described left tube sheet 4 is bolted the water inlet lid 3 of tool water inlet 2 and delivery port 1, described right tube sheet 10 has been bolted water return cover 11, housing 8 tops, two ends or below are also provided with shell-side fluid import 5 and shell-side fluid outlet 9, housing 8 bottoms are provided with leakage hole 12, on described lamination 6, offer and make the shell-side fluid flowing into from shell-side fluid import 5 along heat exchanger axial direction longitudinal flow to shell-side fluid, export longitudinal discharge orifice 62 of 9, housing 8 two ends are provided with certain space, so that shell-side fluid is uniformly distributed between lamination 6, effectively improve the convection heat transfer' heat-transfer by convection of heat exchanger.
The cross-sectional profiles of described lamination 6 and housing 8 is circular.
As shown in Figure 2, described longitudinal discharge orifice 62 be shaped as circle, longitudinally discharge orifice 62 diameters and heat exchanger tube 7 diameter ratios are 0.3 ~ 0.42 described in during triangle stringing; When square stringing or 45 ° of stringings of transposition, the diameter of longitudinal discharge orifice 62 and the ratio of heat exchanger tube 7 overall diameters are 0.4 ~ 0.72.
Described lamination 6 materials can adopt fine aluminium, aluminium alloy, copper alloy and stainless steel, and lamination 6 spacing are 1.5 ~ 6mm.
Described heat exchanger is monoshell journey, and tube side can be a journey, two journeys or quadruple pass; Described heat exchanger can carry out horizontal and vertical installation.
Described in the present embodiment, the high temperature fluid of stacked longitudinal stream heat exchanger enters housing 8 from shell-side fluid import, and multi-form longitudinal discharge orifice 62 of opening by lamination 6 is realized longitudinal flow, then from shell-side fluid outlet, flows out; Water at low temperature flows into heat exchanger tube from water inlet, flows out water return cover 11 is interior after coming and going regulation number of passes from delivery port 1, and high temperature fluid heat release reduces temperature, and water at low temperature absorbs heat temperature and raises, and reaches heat transfer effect.Shell side high temperature fluid is longitudinal stream mistake from longitudinal discharge orifice of lamination, compares with stacked cross-flow heat exchanger, and under the same terms, pressure drop is little.
Shell-side fluid flows through from lamination perforate along heat exchanger axial direction, realizes longitudinal flow; Due to the sudden change of circulation area, during longitudinal discharge orifice of shell-side fluid process lamination, produce jet, strengthened flow disturbance; Again because lamination is enclosed within on heat exchanger tube layer by layer, so shell-side fluid can periodically produce jet, constantly strengthens the whole turbulence intensity of shell-side fluid, thereby improved greatly the film coefficient of heat transfer of shell side, strengthened shell side heat transfer.
Embodiment bis-
As shown in Figure 3, the difference of the present embodiment and embodiment 1 is: described longitudinal discharge orifice 62 be shaped as square, during triangle stringing, longitudinally inscribed circle diameter and heat exchanger tube 7 diameter ratios of discharge orifice 62 are 0.3 ~ 0.42 to square; When square stringing or 45 ° of stringings of transposition, the longitudinal inscribed circle diameter of discharge orifice 62 of square and the ratio of heat exchanger tube (7) overall diameter are 0.4 ~ 0.72.
Embodiment tri-
As shown in Figure 4, the difference of the present embodiment and embodiment 1 is: on lamination, heat exchanger tube perforate centre-to-centre spacing is less than 1.5 with heat exchanger tube external diameter ratio, described longitudinal discharge orifice 62 be shaped as rectangle, length-width ratio is 2 ~ 4, the quantity of the longitudinal discharge orifice 62 on lamination 6 between adjacent heat exchange tubes hole 61 is 1 ~ 2, arranged vertically.Be applicable to heat exchanger tube 7 and arrange occasion comparatively closely.
Embodiment tetra-
As shown in Figure 5, the difference of the present embodiment and embodiment 1 is: on lamination 6, the centre-to-centre spacing of heat exchange pore 61 is greater than 1.5 with heat exchanger tube 7 external diameter ratios, longitudinal discharge orifice 62 on lamination 6 between adjacent heat exchange tubes hole 61 is rectangle, quantity is 3 ~ 6, length-width ratio is 2 ~ 6, each longitudinal discharge orifice 62 horizontal positioned, are applicable to heat exchanger tube 7 and arrange comparatively sparse occasion.
Embodiment five
As shown in Figure 6, the difference of the present embodiment and embodiment mono-is: described longitudinal discharge orifice 62 be shaped as spline shape, during triangle stringing, longitudinal discharge orifice 62 circumscribed circle diameters of spline shape are 0.3 ~ 0.42 with the ratio of heat exchanger tube 7 overall diameters; When square stringing or 45 ° of stringings of transposition, the circumscribed circle diameter of the longitudinal discharge orifice 62 of spline shape is 0.4 ~ 0.72 with the ratio of heat exchanger tube 7 overall diameters.
Embodiment six
As shown in Figure 7, the difference of the present embodiment and embodiment 1 is: the cross-sectional profiles of described housing 8 and lamination 6 is rectangle, and on its lamination, longitudinal stream hole shape and layout can be made as aforesaid circle, square, rectangle or spline shape.
Above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.All any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in the protection domain of the utility model claim.
Claims (10)
1. a laminated grain longitudinal stream heat exchanger, comprise housing (8), heat exchanger tube (7), be welded on left tube sheet (4) and the right tube sheet (10) at housing (8) two ends, be arranged in housing (8) and the every lamination (6) being enclosed within abreast on heat exchanger tube (7) of the certain interval of being separated by, described lamination (6) makes heat exchange pore (61) and heat exchanger tube (7) close contact by whole expand tube, described left tube sheet (4) is bolted the water inlet lid (3) of have water inlet (2) and delivery port (1), described right tube sheet (10) is bolted water return cover (11), above or below housing (8) two ends, be also provided with shell-side fluid import (5) and shell-side fluid outlet (9), housing (8) bottom is provided with leakage hole (12), it is characterized in that: on described lamination (6), offer and make the shell-side fluid flowing into from shell-side fluid import (5) along heat exchanger axial direction longitudinal flow to shell-side fluid, export longitudinal discharge orifice (62) of (9), shell side two ends are equipped with certain space makes shell-side fluid flow into uniformly and flow out.
2. laminated grain longitudinal stream heat exchanger according to claim 1, is characterized in that: the cross-sectional profiles of described lamination (6) and housing (8) can be circle or rectangle.
3. laminated grain longitudinal stream heat exchanger according to claim 1 and 2, is characterized in that: the heat exchange pore (61) on described lamination can adopt triangle stringing, square stringing or 45 ° of stringings of transposition.
4. laminated grain longitudinal stream heat exchanger according to claim 3, is characterized in that: the shape of the longitudinal discharge orifice (62) on described lamination can be circle, square, rectangle or spline shape.
5. laminated grain longitudinal stream heat exchanger according to claim 4, is characterized in that: during triangle stringing, the ratio of rounded longitudinal discharge orifice (62) diameter and heat exchanger tube (7) overall diameter is 0.3 ~ 0.42; When square stringing or 45 ° of stringings of transposition, the ratio of rounded longitudinal discharge orifice (62) diameter and heat exchanger tube (7) overall diameter is 0.4 ~ 0.72.
6. laminated grain longitudinal stream heat exchanger according to claim 4, is characterized in that: during triangle stringing, the longitudinal inscribed circle diameter of discharge orifice (62) of square and the ratio of heat exchanger tube (7) overall diameter are 0.3 ~ 0.42; When square stringing or 45 ° of stringings of transposition, the longitudinal inscribed circle diameter of discharge orifice (62) of square and the ratio of heat exchanger tube (7) overall diameter are 0.4 ~ 0.72.
7. laminated grain longitudinal stream heat exchanger according to claim 4, it is characterized in that: when on lamination (6), heat exchange pore (61) centre-to-centre spacing and heat exchanger tube (7) external diameter ratio are greater than 1.5, the quantity of the longitudinal discharge orifice of rectangle (62) between the upper adjacent heat exchange tubes hole (61) of described lamination (6) is 3 ~ 6, length-width ratio is 2 ~ 6, and longitudinally discharge orifice (62) can be vertically or horizontal positioned; When on lamination (6), heat exchange pore (61) centre-to-centre spacing and heat exchanger tube (7) external diameter ratio are less than 1.5, the quantity of the longitudinal discharge orifice of rectangle (62) between the upper adjacent heat exchange tubes hole (61) of lamination (6) is 1 ~ 2, and length-width ratio is 2 ~ 4.
8. laminated grain longitudinal stream heat exchanger according to claim 4, is characterized in that: during triangle stringing, the ratio of the longitudinal discharge orifice of spline shape (62) circumscribed circle diameter and heat exchanger tube (7) overall diameter is 0.3 ~ 0.42; When square stringing or 45 ° of stringings of transposition, the circumscribed circle diameter of the longitudinal discharge orifice of spline shape (62) and the ratio of heat exchanger tube (7) overall diameter are 0.4 ~ 0.72.
9. laminated grain longitudinal stream heat exchanger according to claim 1 and 2, is characterized in that: described lamination (6) material can adopt fine aluminium, aluminium alloy, copper alloy and stainless steel, and lamination (6) spacing is 1.5 ~ 6mm.
10. laminated grain longitudinal stream heat exchanger according to claim 1 and 2, is characterized in that: described heat exchanger is monoshell journey, and tube side can be a journey, two journeys or quadruple pass; Described heat exchanger can carry out horizontal and vertical installation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320504974.4U CN203454859U (en) | 2013-08-19 | 2013-08-19 | Novel laminated sheet type longitudinal flow heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320504974.4U CN203454859U (en) | 2013-08-19 | 2013-08-19 | Novel laminated sheet type longitudinal flow heat exchanger |
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| Publication Number | Publication Date |
|---|---|
| CN203454859U true CN203454859U (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320504974.4U Expired - Fee Related CN203454859U (en) | 2013-08-19 | 2013-08-19 | Novel laminated sheet type longitudinal flow heat exchanger |
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| CN (1) | CN203454859U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424010A (en) * | 2013-08-19 | 2013-12-04 | 华南理工大学 | Novel laminated vertical flow heat exchanger |
| CN109210966A (en) * | 2018-08-13 | 2019-01-15 | 佛山市顺德区金舵空调冷冻设备有限公司 | A kind of shell and tube exchanger |
| CN109489453A (en) * | 2018-12-11 | 2019-03-19 | 河南龙成煤高效技术应用有限公司 | Heat exchange unit, heat exchanger and heat exchange equipment |
| CN112432523A (en) * | 2020-10-29 | 2021-03-02 | 河北建筑工程学院 | Shell-and-tube heat exchanger with conical hole baffle structure |
-
2013
- 2013-08-19 CN CN201320504974.4U patent/CN203454859U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424010A (en) * | 2013-08-19 | 2013-12-04 | 华南理工大学 | Novel laminated vertical flow heat exchanger |
| CN103424010B (en) * | 2013-08-19 | 2016-06-22 | 华南理工大学 | A kind of stacked longitudinal direction flows heat exchanger |
| CN109210966A (en) * | 2018-08-13 | 2019-01-15 | 佛山市顺德区金舵空调冷冻设备有限公司 | A kind of shell and tube exchanger |
| CN109489453A (en) * | 2018-12-11 | 2019-03-19 | 河南龙成煤高效技术应用有限公司 | Heat exchange unit, heat exchanger and heat exchange equipment |
| CN109489453B (en) * | 2018-12-11 | 2023-12-19 | 河南龙成煤高效技术应用有限公司 | Heat exchange unit, heat exchanger and heat exchange equipment |
| CN112432523A (en) * | 2020-10-29 | 2021-03-02 | 河北建筑工程学院 | Shell-and-tube heat exchanger with conical hole baffle structure |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140226 Termination date: 20160819 |