CN109425116A - A kind of heat exchange structure and gas heater - Google Patents
A kind of heat exchange structure and gas heater Download PDFInfo
- Publication number
- CN109425116A CN109425116A CN201710777952.8A CN201710777952A CN109425116A CN 109425116 A CN109425116 A CN 109425116A CN 201710777952 A CN201710777952 A CN 201710777952A CN 109425116 A CN109425116 A CN 109425116A
- Authority
- CN
- China
- Prior art keywords
- heat exchange
- heat exchanger
- bottom case
- exchange structure
- jacketed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000007789 sealing Methods 0.000 claims abstract description 5
- 239000000779 smoke Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000007789 gas Substances 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/02—Tubular elements of cross-section which is non-circular
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
Abstract
The present invention discloses a kind of heat exchange structure and gas heater, gas heater includes bottom case, bottom case is in open setting upward, heat exchange structure includes: jacketed heat exchanger, including liner and shell, liner lower end is open, and shell is arranged the outer wall of liner, and the opening of jacketed heat exchanger is docked with the open sealing of bottom case；And main heat exchanger, it is installed on bottom case inner cavity, main heat exchanger has water inlet end and water outlet, and water inlet end is connected to jacketed heat exchanger, and water outlet is pierced by by bottom case.Heat exchange structure of the present invention can effectively improve energy utilization rate and heating efficiency.
Description
Technical field
The present invention relates to field of water heaters, in particular to a kind of heat exchange structure and gas heater.
Background technique
Gas heater is transmitted to heat exchange using combustion gas as main energy sources material, by the high temperature heat that fuel gas buring generates
Structure, then the cold water for flowing through heat exchange structure is transmitted to achieve the purpose that heat water.Current heat exchange structure is most only
It is provided with a heat exchanger, i.e., only once exchanged heat and primary heating is carried out to water, this does not make full use of heat not only,
Also cause the heating efficiency to water not high.
Summary of the invention
The main object of the present invention is to propose a kind of heat exchange structure, it is intended to solve heat exchange structure energy utilization in the prior art
The low technical problem low with heat exchange efficiency of rate.
To achieve the above object, heat exchange structure proposed by the present invention is applied to gas heater, the gas heater packet
Bottom case is included, the bottom case includes: in open setting, the heat exchange structure upward
Jacketed heat exchanger, including liner and shell, the liner lower end is open, and the shell is arranged the liner
Outer wall, the opening of the jacketed heat exchanger are docked with the open sealing of the bottom case；And
Main heat exchanger, is installed on the bottom case inner cavity, and the main heat exchanger has water inlet end and a water outlet, it is described into
Water end (W.E.) is connected to the jacketed heat exchanger, and the water outlet is pierced by by the bottom case.
Preferably, the shell of the jacketed heat exchanger offers water inlet, and the water inlet is opened in the shell
Top, the main heat exchanger is connected to the lower end of the jacketed heat exchanger.
Preferably, the shell of the jacketed heat exchanger offers water outlet, and the bottom case offers water inlet interface, institute
Water inlet interface is stated to be connected to the water inlet end of the main heat exchanger, the heat exchange structure further include connect the water outlet with it is described
The connecting tube of water inlet interface.
Preferably, the main heat exchanger includes heat exchange flat tube, the surface concave-convex surface setting of the heat exchange flat tube.
Preferably, the main heat exchanger includes heat exchange flat tube and wave-shaped fins, and the heat exchange flat tube has flat
Face, the wave-shaped fins are abutted with the flat horizontal surface.
Preferably, the quantity of the heat exchange flat tube and the wave-shaped fins is multiple, and the heat exchange flat tube with
The wave-shaped fins are in be arranged alternately.
Preferably, the heat exchange flat tube is separately positioned between two adjacent wave shape fins.
Preferably, the heat exchange flat tube and the wave-shaped fins are circumferentially extended along the inner cavity of the bottom case.
Preferably, the bottom case offers smoke outlet, and the smoke outlet is located at below the main heat exchanger.
The present invention also proposes that a kind of gas heater, including a kind of heat exchange structure, the gas heater include bottom case, institute
Bottom case is stated in open setting upward, the heat exchange structure includes: jacketed heat exchanger, including liner and shell, the liner
Lower end is open, and the shell is arranged the outer wall of the liner, the opening and the opening of the bottom case of the jacketed heat exchanger
Sealing docking；And main heat exchanger, it is installed on the bottom case inner cavity, the main heat exchanger has water inlet end and water outlet,
The water inlet end is connected to the jacketed heat exchanger, and the water outlet is pierced by by the bottom case.
Heat exchange structure of the present invention is by using jacketed heat exchanger and the main heat exchange being connected to jacketed heat exchanger
Device, allow fuel gas buring generate thermal current tentatively exchange heat with jacketed heat exchanger first, then again with main heat exchanger
Heat exchange, in this way, being heated twice in heat transfer process to water, effectively increases capacity usage ratio and heating efficiency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structural schematic diagram of one embodiment of heat exchange structure of the present invention；
Fig. 2 is the schematic diagram of one cross-section structure of heat exchange structure in Fig. 1；
Fig. 3 is the schematic diagram of another cross-section structure of heat exchange structure in Fig. 1；
Fig. 4 is the structural schematic diagram of main heat exchanger in the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title | Label | Title |
| 10 | Bottom case | 11 | Water inlet interface | 12 | Smoke outlet |
| 13 | Water outlet mouthpiece | 20 | Jacketed heat exchanger | 21 | Water inlet |
| 22 | Water outlet | 23 | Liner | 231 | The upper roof of liner |
| 30 | Combustion chamber | 24 | Shell | 31 | Burner |
| 50 | Main heat exchanger | 60 | Connecting tube | 51 | Heat exchange flat tube |
| 52 | Wave-shaped fins |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
The present invention proposes a kind of heat exchange structure and a kind of gas heater.Heat exchange structure include jacketed heat exchanger 20 with
Main heat exchanger 50, heat exchange structure is for being transferred to cold water for the high temperature heat that fuel gas buring generates in gas water heater working
To be heated to water.
In embodiments of the present invention, as shown in Figure 1 to Figure 3, which is applied to gas heater, gas heater
Including bottom case 10, bottom case 10 includes: in open setting, heat exchange structure upward
Jacketed heat exchanger 20, including liner 23 and shell 24,23 lower end of liner is open, and shell 24 is arranged liner 23
Outer wall, the opening of jacketed heat exchanger 20 are docked with the open sealing of bottom case 10；And
Main heat exchanger 50, is installed on 10 inner cavity of bottom case, and main heat exchanger 50 has water inlet end (figure is not marked) and water outlet
(figure is not marked), water inlet end is connected to jacketed heat exchanger 20, and water outlet is pierced by by bottom case 10.
In the present embodiment, interlayer space, jacket type are formed between the liner 23 and shell 24 of jacketed heat exchanger 20
Heat exchanger 20 is a kind of heat exchanger to be exchanged heat using interlayer space for water disposed within.On jacketed heat exchanger 20
Setting water inlet 21 connects with external world's circulation line to facilitate and continually introduces cold water.Main heat exchanger 50 can be finned heat
Exchanger both can directly be connected to or pass through pipeline between jacketed heat exchanger 20 and the water inlet end of main heat exchanger 50
Indirect communication.Bottom case 10 offers water outlet mouthpiece 13, and the water outlet of main heat exchanger 50 is pierced by by water outlet mouthpiece 13 so as to will be hot
Water is drawn；It should be noted that the amount of being pierced by that the water outlet of main heat exchanger 50 is pierced by from bottom case 10 can be zero, i.e., main heat is handed over
The water outlet of parallel operation 50 can be directly connected to water outlet mouthpiece 13, can also be exposed to outside bottom case 10 by water outlet mouthpiece 13.
The liner 23 of jacketed heat exchanger 20 is enclosed combustion chamber 30, and combustion chamber 30 is fired for installing burner 31
Gas generates thermal current after being burnt on burner 31 and heat radiation, thermal current and heat radiation are passed heat by heat exchange structure
The water for flowing through heat exchange structure is handed to heat to water.
The thermal current of combustion chamber 30 can tentatively exchange heat with jacketed heat exchanger 20 first, then along in liner 23
Wall flows downward and exchanges heat with the main heat exchanger 50 for being placed in 10 inner cavity of bottom case, is most discharged afterwards through smoke outlet 12；At the same time, to
The water of heating is flowed into from the water inlet 21 of jacketed heat exchanger 20 first, is entered back into after flowing through jacketed heat exchanger 20
Main heat exchanger 50, most the water outlet mouthpiece 13 through 10 outer wall of bottom case flows out afterwards.In this way, being added twice in heat transfer process to water
Heat effectively increases capacity usage ratio and heating efficiency.
Further, as depicted in figs. 1 and 2, the shell 24 of jacketed heat exchanger 20 offers water inlet 21, water inlet
21 are opened in the top of shell 24, and main heat exchanger 50 is connected to the lower end of jacketed heat exchanger 20.
In the present embodiment, due to the absorption of upper roof 231 with its open opposite liner of jacketed heat exchanger 20
The heat of burner 31 is most, therefore water inlet 21 is provided with to the top of shell 24, it is ensured that the water being initially introduced is first
It exchanges heat with the highest position of 20 temperature of jacketed heat exchanger.And by the lower end of main heat exchanger 50 and jacketed heat exchanger 20
Connection, in conjunction with the position that opens up of water inlet 21, can so lengthen the average path of water flowing in jacketed heat exchanger 20, from
And heat exchange efficiency can be improved.
Further, as depicted in figs. 1 and 2, the shell 24 of jacketed heat exchanger 20 offers water outlet 22, bottom case 10
Water inlet interface 11 is offered, water inlet interface 11 is connected to the water inlet end of main heat exchanger 50, and heat exchange structure further includes connection water outlet
The connecting tube 60 of mouth 22 and water inlet interface 11.
In the present embodiment, jacketed heat exchanger 20 is connected to main heat exchanger 50 by connecting tube 60, connecting tube 60
It is placed outside the main body section of jacketed heat exchanger 20 and bottom case 10, is more advantageous to the dress of jacketed heat exchanger 20 Yu bottom case 10
With production.In conjunction with the embodiment that main heat exchanger 50 is connected to the lower end of jacketed heat exchanger 20, water outlet 22 is preferably opened
Set on the lower end of shell 24.
Further, as shown in figure 4, main heat exchanger 50 includes heat exchange flat tube 51, the surface of heat exchange flat tube 51 is in
Concavo-convex setting.
In the present embodiment, heat exchanger channels are formed inside heat exchange flat tube 51, heat exchanges heat and right with heat exchange flat tube 51
The water for flowing through heat exchanger channels is heated, and heat exchange flat tube 51 has bigger heat exchange area compared with general round tube, and will be hot
The surface concave-convex surface setting of exchange flat tube 51 then more increases heat exchange area, to improve heat utilization ratio and to water
Heating efficiency.
Further, as shown in figure 4, main heat exchanger 50 includes heat exchange flat tube 51 and wave-shaped fins 52, heat exchange is flat
Pipe 51 has flat horizontal surface, and wave-shaped fins 52 are abutted with flat horizontal surface.
In the present embodiment, wave-shaped fins 52 are used to increase the heat exchange area of heat exchange flat tube 51, heat exchange flat tube 51
Flat horizontal surface can be one side, be also possible to opposite two sides, here preferably opposite two sides, to increase heat exchange area,
Further, as shown in figure 4, the quantity of heat exchange flat tube 51 and wave-shaped fins 52 is multiple, and heat exchange is flat
Pipe 51 is in be arranged alternately with wave-shaped fins 52.
In the present embodiment, main heat exchanger is divided into the heat exchange flat tube 51 and wave-shaped fins 52 of multiple parallel connections, favorably
In carrying out shunting heating to water, to keep the heating of water more evenly and more efficient.It is understood that by heat exchange flat tube 51 with
Wave-shaped fins 52 are in be arranged alternately, while effectively increasing heat exchange area, moreover it is possible to save heat exchange material, reduce cost.
Further, as shown in figure 4, heat exchange flat tube 51 is separately positioned between two adjacent wave shape fins 52.In this reality
It applies in example, a heat exchange flat tube 51 is both provided between every two adjacent wave-shaped fins 52, i.e., each heat exchange flat tube 51
Two flat horizontal surfaces all abutted with wave-shaped fins 52, make each heat exchange flat tube 51 that can have bigger heat exchange area as a result, from
And heat is more fully utilized, while improving the heating efficiency to water.
Further, as shown in Figures 2 to 4, heat exchange flat tube 51 and wave-shaped fins 52 are circumferential along the inner cavity of bottom case 10
Extend.In the present embodiment, the water inlet end of heat exchange flat tube 51 is connected to water inlet interface 11, water outlet and water outlet mouthpiece 13 connect
Logical, since heat exchange flat tube 51 is circumferentially extended along the inner cavity of bottom case 10, water inlet interface 11 and water outlet mouthpiece 13 are opened in bottom
The same side of shell 10.The heat exchange flat tube 51 and wave-shaped fins 52 circumferentially extended along the inner cavity of bottom case 10 can increase and thermal current
Heat exchange area absorbs more heats, while also increasing flow path of the water in heat exchange flat tube 51, both improves heat as a result,
The utilization rate of amount, and improve the heating efficiency to water.
Further, as shown in figure 3, bottom case 10 offers smoke outlet 12, smoke outlet 12 is located at 50 lower section of main heat exchanger.
In the present embodiment, smoke outlet 12 is provided with main heat and handed over by smoke outlet 12 for exhaust gas discharge remaining after thermal current exchanges heat
The lower section of parallel operation 50 can make thermal current or heat radiation must could be through 12 row of smoke outlet after exchanging heat with main heat exchanger 50
Out, and then the heat utilization ratio of heat exchange structure entirety can be improved.
The present invention also proposes a kind of gas heater, which includes a kind of heat exchange structure, the heat exchange structure
Specific structure is referring to above-described embodiment, since this gas heater uses whole technical solutions of above-mentioned all embodiments, because
This at least has all beneficial effects brought by the technical solution of above-described embodiment, and this is no longer going to repeat them.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of heat exchange structure is applied to gas heater, the gas heater includes bottom case, and the bottom case is in open upward
Setting, which is characterized in that the heat exchange structure includes:
Jacketed heat exchanger, including liner and shell, the liner lower end is open, and the shell is arranged the outer of the liner
Wall, the opening of the jacketed heat exchanger are docked with the open sealing of the bottom case；And
Main heat exchanger, is installed on the bottom case inner cavity, and the main heat exchanger has water inlet end and water outlet, the water inlet end
It is connected to the jacketed heat exchanger, the water outlet is pierced by by the bottom case.
2. heat exchange structure as described in claim 1, which is characterized in that the shell of the jacketed heat exchanger is offered into water
Mouthful, the water inlet is opened in the top of the shell, the lower end company of the main heat exchanger and the jacketed heat exchanger
It is logical.
3. heat exchange structure as claimed in claim 1 or 2, which is characterized in that the shell of the jacketed heat exchanger offers
Water outlet, the bottom case offer water inlet interface, and the water inlet interface is connected to the water inlet end of the main heat exchanger, described to change
Heat structure further includes the connecting tube for connecting the water outlet Yu the water inlet interface.
4. heat exchange structure as described in claim 1, which is characterized in that the main heat exchanger includes heat exchange flat tube, described
The surface concave-convex surface of heat exchange flat tube is arranged.
5. heat exchange structure as described in claim 1, which is characterized in that the main heat exchanger includes heat exchange flat tube and waveform
Fin, the heat exchange flat tube have flat horizontal surface, and the wave-shaped fins are abutted with the flat horizontal surface.
6. heat exchange structure as claimed in claim 5, which is characterized in that the quantity of the heat exchange flat tube and the wave-shaped fins
It is multiple, and the heat exchange flat tube is in be arranged alternately with the wave-shaped fins.
7. heat exchange structure as claimed in claim 6, which is characterized in that the heat exchange flat tube is separately positioned on two adjacent wave shapes
Between fin.
8. heat exchange structure as described in claim 4 or 5, which is characterized in that the heat exchange flat tube and the wave-shaped fins are equal
It is circumferentially extended along the inner cavity of the bottom case.
9. heat exchange structure as described in claim 1, which is characterized in that the bottom case offers smoke outlet, the smoke outlet position
Below the main heat exchanger.
10. a kind of gas heater, which is characterized in that including heat exchange structure as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710777952.8A CN109425116A (en) | 2017-08-31 | 2017-08-31 | A kind of heat exchange structure and gas heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710777952.8A CN109425116A (en) | 2017-08-31 | 2017-08-31 | A kind of heat exchange structure and gas heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109425116A true CN109425116A (en) | 2019-03-05 |
Family
ID=65512786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710777952.8A Withdrawn CN109425116A (en) | 2017-08-31 | 2017-08-31 | A kind of heat exchange structure and gas heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109425116A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111721001A (en) * | 2020-07-27 | 2020-09-29 | 四川昊宇龙星科技有限公司 | Integral heat exchanger for wall-mounted furnace and application method thereof |
-
2017
- 2017-08-31 CN CN201710777952.8A patent/CN109425116A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111721001A (en) * | 2020-07-27 | 2020-09-29 | 四川昊宇龙星科技有限公司 | Integral heat exchanger for wall-mounted furnace and application method thereof |
| CN111721001B (en) * | 2020-07-27 | 2023-09-19 | 四川昊宇龙星能源科技有限公司 | Integral heat exchanger for wall-mounted furnace and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20190227 Address after: 241009 Wan Chun East Road, East District, Wuhu economic and Technological Development Zone, Anhui Applicant after: WUHU MIDEA KITCHEN AND BATH APPLIANCES MFG. Co.,Ltd. Applicant after: DALIAN INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES Applicant after: MIDEA GROUP Co.,Ltd. Address before: 241009 Wan Chun East Road, East District, Wuhu economic and Technological Development Zone, Anhui Applicant before: WUHU MIDEA KITCHEN AND BATH APPLIANCES MFG. Co.,Ltd. Applicant before: MIDEA GROUP Co.,Ltd. |
|
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190305 |