CN115420020A - Heat exchanger and gas water heater - Google Patents
Heat exchanger and gas water heater Download PDFInfo
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- CN115420020A CN115420020A CN202211017698.9A CN202211017698A CN115420020A CN 115420020 A CN115420020 A CN 115420020A CN 202211017698 A CN202211017698 A CN 202211017698A CN 115420020 A CN115420020 A CN 115420020A
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- heat exchange
- exchange tube
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- pipe
- heat
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- 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
- F24H9/0005—Details for water heaters
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- 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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
- F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
- F24H1/145—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using fluid fuel
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- 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
- F24H9/14—Arrangements for connecting different sections, e.g. in water heaters
- F24H9/146—Connecting elements of a heat exchanger
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses a heat exchanger and a gas water heater, and relates to the field of gas water heaters, wherein the heat exchanger comprises a water inlet pipe, a water outlet pipe and a heat exchange assembly, the heat exchange assembly comprises a plurality of heat exchange pipe layers, the heat exchange pipe layers are vertically stacked and arranged and are sequentially connected in series, the heat exchange pipe layer positioned at the lowermost part is communicated with the water inlet pipe, and the heat exchange pipe layer positioned at the uppermost part is communicated with the water outlet pipe; the gas water heater comprises the heat exchanger; the invention has the effect of relieving the water boiling phenomenon in the heat exchanger of the gas water heater.
Description
Technical Field
The invention relates to the field of gas water heaters, in particular to a heat exchanger and a gas water heater.
Background
A gas water heater is an apparatus for heating cold water for human use by burning gas. When the gas water heater is used, gas in the fire grate is combusted to generate high-temperature flue gas, and the high-temperature flue gas is contacted with the heat exchanger above the fire grate and is added with cold water in the heat exchanger.
When the temperature of outlet water of a heat exchanger of a gas water heater is set to be higher (above 55 ℃) and the gas water heater is burnt under a large load, or in the process of rapid heating under a large load, or when the pressure of inlet water is lowered and the water quantity is reduced, the phenomenon of water boiling is easily generated. When the water boiling phenomenon occurs, hot water exceeding a set temperature is easily generated, and large water boiling noise is accompanied. Thus causing great trouble to the user.
Disclosure of Invention
The invention provides a heat exchanger and a gas water heater, aiming at overcoming the defect of water boiling in the heat exchanger of the gas water heater in the prior art, and the heat exchanger and the gas water heater are used for relieving the water boiling phenomenon in the heat exchanger of the gas water heater.
In a first aspect, the invention provides a heat exchanger, which adopts the following technical scheme:
the utility model provides a heat exchanger, includes inlet tube, outlet pipe and heat exchange assembly, heat exchange assembly includes a plurality of heat transfer tube layers, and is a plurality of the vertical stacking in heat transfer tube layer is arranged and is established ties in proper order, and is located the below the heat transfer tube layer with the inlet tube intercommunication is located the top the heat transfer tube layer with the outlet pipe is linked together.
In the scheme, the heat exchange tube layers are vertically stacked and sequentially connected in series, the heat exchange tube layer positioned at the lowest part is closest to the combustor, and the heating speed of the water in the heat exchange tube layer is high; the heat exchange pipe layer positioned at the uppermost part is far away from the burner, and the heating speed of water in the heat exchange pipe layer is low when the heat exchange pipe layer is heated; the water inlet pipe is connected with the heat exchange pipe layer at the lowest part, and the water outlet pipe is connected with the heat exchange pipe layer at the uppermost part, so that cold water flows to the heat exchange pipe layer at the uppermost part from the heat exchange pipe layer at the lowest part in sequence, the temperature of the water in the heat exchange pipe layer at the lowest part is lowest, and the water is not easy to boil during heating; when the water with the increased temperature flows to the heat exchange tube layer positioned above, the heating speed of the water is reduced, and the water is not easy to boil.
Preferably, the heat exchange tube layers comprise heat exchange tubes, a first connecting tube is arranged between every two adjacent heat exchange tube layers, and the first connecting tube is connected between the heat exchange tubes of the two adjacent heat exchange tube layers.
In the scheme, a structure of the heat exchange tube layer is disclosed; each heat exchange tube layer comprises a heat exchange tube, water enters the heat exchange tube for heat exchange, and a first connecting tube is connected between two heat exchange tubes of two adjacent heat exchange tube layers to realize the series connection of the two adjacent heat exchange tube layers; when water is heated, cold water flows into the heat exchange pipe fitting of the heat exchange pipe layer at the lowest layer through the water inlet pipe, flows into the heat exchange pipe fitting of the heat exchange pipe layer at the upper part through the first connecting pipe after flowing through the heat exchange pipe layer at the lowest layer for heating, and is continuously heated; the mode of adopting the heat exchange pipe fitting to carry out heat exchange has lower cost, simple manufacture and convenient maintenance and replacement of the heat exchange pipe layer.
Preferably, each heat exchange tube layer comprises at least two heat exchange tubes, a second connecting tube is connected between two adjacent heat exchange tubes in the heat exchange tube layer, and the heat exchange tubes are sequentially connected in series and arranged in a reciprocating and returning mode through the second connecting tubes.
In the scheme, the heat exchange pipe fittings of each heat exchange pipe layer are connected in series through the second connecting pipe, so that the total length of the heat exchange pipe fittings is increased, the heat exchange area of the heat exchange pipe layers is increased, and the heating efficiency of the heat exchanger is favorably improved; the heat exchange pipe fitting is arranged in a reciprocating and returning mode, so that the total length of the heat exchange pipe fitting is increased, the space occupied by the heat exchange pipe fitting is saved, and the arrangement of a heat exchange pipe layer is facilitated
Preferably, the heat exchange tube layer is arranged obliquely, and the heat exchange tube close to the water inflow direction in the heat exchange tube layer is located below the heat exchange tube close to the water outflow direction.
In the scheme, the heat exchange tube layer is obliquely arranged, so that the heat exchange tube close to the water inflow direction is positioned below the heat exchange tube close to the water outflow direction, the water temperature in the heat exchange tube positioned below in the heat exchange tube layer is lower, the heated water enters the heat exchange tube above, and the heating speed is reduced; thereby making the water inside the heat exchange tubes less prone to boiling.
Preferably, the heat exchange pipe fitting is a straight pipe fitting.
In the scheme, the heat exchange pipe fitting is a straight pipe fitting, so that the heat exchange pipe fitting is convenient to obtain, and the cost is reduced; meanwhile, hydrodynamic resistance loss in the heat exchange pipe fitting can be reduced, and normal work of the heat exchanger is facilitated.
Preferably, the heat exchange pipes are parallel to each other.
In this scheme, be parallel to each other between the heat transfer pipe fitting to can make the flow condition of water between each heat transfer pipe fitting similar, the flow of water is comparatively stable, makes the heating efficiency of the water in the heat transfer pipe fitting comparatively stable simultaneously.
Preferably, the water inlet pipe and the water outlet pipe are respectively positioned at two opposite sides of the heat exchange assembly.
In this scheme, inlet tube and outlet pipe set up respectively in heat exchange assemblies's relative both sides, make arranging of heat exchanger comparatively balanced from this, and mutual interference's probability makes things convenient for the installation of inlet tube and outlet pipe simultaneously between less inlet tube and the outlet pipe.
Preferably, a connection elbow is connected between the water outlet pipe and the heat exchange pipe layer positioned at the uppermost position, and the connection elbow is a U-shaped pipe fitting with a downward opening.
In this scheme, connect the elbow open-down, its two openings are continuous with the heat exchange tube layer that is located the top in the outlet pipe respectively, and the intraformational water of heat exchange tube wants to flow through the outlet pipe from this and needs the intraformational water of heat exchange tube to cross the connection elbow earlier to make the intraformational water of heat exchange tube keep the state of full duct flow, be difficult for when water pressure is lower to appear the phenomenon that water boiled because of water fails to fill up the heat exchange tube layer in the heat exchange tube layer of top.
Preferably, the heat exchanger further comprises a plurality of heat exchange fins stacked in the transverse direction, and the heat exchange pipe passes through the heat exchange fins.
In the scheme, the heat exchange pipe passes through the heat exchange fin plate, and the heat exchange fin plate increases the contact area of the heat exchange pipe and high-temperature flue gas generated by combustion, so that the heating efficiency is improved; a plurality of heat transfer finned plates are transversely piled up for form the clearance that is convenient for the flue gas to rise between the heat transfer finned plate, thereby be favorable to strengthening the heat transfer effect.
In a second aspect, the invention provides a gas water heater, which comprises the heat exchanger.
In this scheme, gas heater's beneficial effect is the same with the beneficial effect of above-mentioned heat exchanger, and here is no longer repeated.
The positive progress effects of the invention are as follows:
according to the invention, the arrangement mode of the heat exchange tube layers is designed, so that the heat exchange tube layers are vertically stacked and arranged and are sequentially connected in series, the water inlet tube is connected with the heat exchange tube layer at the lowest part, the water outlet tube is connected with the heat exchange tube layer at the uppermost part, water flows from bottom to top, so that the heat exchange tube layer is closest to a burner, the temperature of the water in the heat exchange tube layer is lowest when the heat exchange temperature is highest, and the heat exchange tube layer is far away from the burner when the temperature of the water in the heat exchange tube layer is increased, and the heat exchange temperature is reduced; therefore, water in each layer of heat exchange tube layer is not easy to boil, and a user can use the heat exchanger conveniently.
Drawings
Fig. 1 is a schematic structural diagram of a gas water heater according to an embodiment of the present invention.
Fig. 2 is an exploded schematic view of a gas water heater according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a heat exchange tube layer according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a second connecting pipe according to an embodiment of the invention.
Fig. 6 is a schematic distribution diagram of a heat exchange tube according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a heat exchanger with connecting bends according to an embodiment of the invention.
Fig. 8 is another schematic structural diagram of a heat exchanger according to an embodiment of the present invention.
Description of reference numerals:
Combustor can 110
Low section fire grate 120
High-section fire grate 130
The water inlet pipe 210
Heat exchange tube layer 231
Upper heat exchange tube layer 231a
Lower heat exchange tube layer 231b
Heat exchange pipe fitting 232
First heat exchange pipe fitting 232a
Second heat exchange tube member 232b
Third heat exchange tube 232c
Fourth heat exchange tube 232d
Fifth heat exchange tube 232e
First connecting pipe 233
Second connecting pipe 234
Ascending part 241
Descending part 242
Heat exchange inner shell 250
Detailed Description
The present invention is further illustrated with reference to the following figures and examples, without thereby limiting the scope of the invention to the examples.
Example 1
The present embodiment discloses a gas water heater, and referring to fig. 1, the gas water heater includes a burner 100 and a heat exchanger 200 disposed above the burner 100. The burner 100 is used for burning gas to provide heat for the heat exchanger 200; water flows in the heat exchanger 200 so that the heat exchanger 200 transfers the heat generated from the burner 100 to the water for the purpose of heating the water.
Referring to fig. 2, therein, the burner 100 includes a combustion chamber box 110 and one or more fire rows disposed within the combustion chamber box 110. Gas can be passed into the fire and burned to provide heat to the heat exchanger 200. The hot water efficiency of the gas water heater can be adjusted by adjusting the number of fire rows simultaneously burned in the burner 100.
In this embodiment, six fire rows are provided inside the combustion chamber box 110. The six fire rows are arranged in parallel, and three fire rows positioned at the inner side are defined as a low-section fire row 120, and three fire rows positioned at the outer side are defined as a high-section fire row 130. The combustor 100 is a staged combustor having both low and high stage combustion stages. When the burner 100 is in the low stage position, only three low stage fire rows 120 are fired; when the combustor 100 is in the high range position, the three low range rows 120 and the three high range rows 130 are all fired.
Moreover, in other embodiments, the number of fire rows within the combustor 100 may be other suitable values; in other embodiments, the fire rows can be arranged in other suitable manners; in other embodiments, the combustion stage of the combustor 100 may have other suitable values.
Referring to fig. 1 and 2, the heat exchanger 200 includes a water inlet pipe 210 for supplying cold water, a water outlet pipe 220 for supplying hot water, and a heat exchange assembly 230 for supplying water to exchange heat with high-temperature flue gas generated by combustion to heat water. The water inlet pipe 210 and the water outlet pipe 220 are connected to the heat exchange assembly 230. Therefore, cold water flows into the heat exchange assembly 230 through the water inlet pipe 210, the temperature of the cold water is increased to become hot water after the heat exchange assembly 230 exchanges heat with high-temperature flue gas generated by combustion, and the hot water flows out of the heat exchanger 200 through the water outlet pipe 220 for a user to use.
In this embodiment, the water inlet pipe 210 and the water outlet pipe 220 are respectively disposed at two opposite sides of the heat exchange assembly 230, so that the arrangement of the heat exchanger 200 is more balanced, the water inlet pipe 210 and the water outlet pipe 220 are not easily interfered, and the water inlet pipe 210 and the water outlet pipe 220 are conveniently mounted. In addition, in other embodiments, the water inlet pipe 210 and the water outlet pipe 220 may be disposed at suitable positions on the heat exchange assembly 230.
In some preferred embodiments, the heat exchanger 200 further includes an inner heat exchange shell 250, and the heat exchange assembly 230 is fixedly disposed outside the inner heat exchange shell 250 and supported by the inner heat exchange shell 250, so that the heat exchanger 200 is more stable and reliable. The heat exchange inner shell 250 may be made of oxygen-free copper, phosphorus deoxidized copper, stainless steel, and other materials with good thermal conductivity, high temperature resistance, and corrosion resistance. The inner heat exchange shell 250 in this embodiment is made of phosphorus deoxidized copper.
Referring to fig. 2-4, the heat exchange assembly 230 includes several heat exchange tube layers 231. Several heat exchanger layers 231 are vertically stacked and serially connected in sequence. The vertical stacking herein means that the heat exchange tube layers 231 are sequentially arranged from bottom to top such that different heat exchange tube layers 231 are spaced from the combustion chamber box 110 differently. The heat exchange tube layer 231 located at the lowermost portion is connected to the water inlet pipe 210, and the heat exchange tube layer 231 located at the uppermost portion is connected to the water outlet pipe 220. From this water flows into the heat exchange tube layer 231 of the below through inlet tube 210, then from down in proper order up through each heat exchange tube layer 231 and carry out the heat transfer, at last from outlet pipe 220 outflow heat exchanger 200.
Wherein the heat exchange tube layer 231 is hollow inside to allow water to flow therethrough. In this embodiment, the heat exchange tube layer 231 includes the heat exchange tube member 232, and the first connecting tube 233 is connected between the heat exchange tube members 232 of two adjacent heat exchange tube layers 231, so that the heat exchange tube members 232 of two adjacent heat exchange tube layers 231 are communicated with each other, and the series connection of the adjacent heat exchange tube layers 231 is realized. In addition, in other embodiments, the heat exchange tube layer 231 may also have other suitable structures, and only the heat exchange tube layer 231 has a cavity inside for water to flow through, and the heat exchange tube layers 231 are connected in series.
The number of layers of the heat exchange tube layer 231 can be designed according to the requirement. In this embodiment, the number of the heat exchange tube layers 231 is specifically shown as two, and the heat exchange tube layer 231 located above is defined as an upper heat exchange tube layer 231a, and the heat exchange tube layer 231 located below is defined as a lower heat exchange tube layer 231b. In other embodiments, the number of heat exchange tube layers 231 may be other suitable values.
The number of the heat exchange pipes 232 per heat exchange pipe layer 231 may be one or more. When the one heat exchange tube layer 231 includes the plurality of heat exchange tubes 232, the plurality of heat exchange tubes 232 are sequentially arranged in series and reciprocally folded back.
Referring to fig. 4 and 5, a second connection pipe 234 is connected between two adjacent heat exchange pipe members 232. The second connecting pipe 234 is a U-shaped pipe, and includes two straight pipe portions 235 for connecting the heat exchange pipe 232 and a communicating portion 236 connected between the two straight pipe portions 235, the two straight pipe portions 235 are located on the same side of the communicating portion 236, and one end of the heat exchange pipe 232 is connected to the straight pipe portions 235. When water is heated, the water flows from one end of one heat exchange pipe member 232 to the other end, is turned by the second connection pipe 234, flows into the adjacent heat exchange pipe member 232, and is turned back in the opposite direction. Therefore, the flow path of water is increased, the heat exchange pipe fitting 232 is arranged as compact as possible, and the space required by the installation of the heat exchange pipe fitting 232 is reduced.
Referring to fig. 2, 3 and 6, in the embodiment, the lower heat exchange tube layer 231b includes three heat exchange tubes 232, which are defined as a first heat exchange tube 232a, a second heat exchange tube 232b and a third heat exchange tube 232c in sequence according to the flowing direction of water; a second connection pipe 234 is disposed between the first heat exchange pipe 232a and the second heat exchange pipe 232b, and a second connection pipe 234 is disposed between the second heat exchange pipe 232b and the third heat exchange pipe 232c; the upper heat exchange pipe layer 231a includes two heat exchange pipe members 232, which are defined as a fourth heat exchange pipe member 232d and a fifth heat exchange pipe member 232e in sequence according to the flowing direction of water, and a second connection pipe 234 is connected between the fourth heat exchange pipe member 232d and the fifth heat exchange pipe member 232 e. The first heat exchange pipe 232a is connected to the water inlet pipe 210, and the fifth heat exchange pipe 232e is connected to the water outlet pipe 220. The water exchanges heat with the high-temperature flue gas sequentially through the first heat exchange pipe 232a, the second heat exchange pipe 232b, the third heat exchange pipe 232c, the fourth heat exchange pipe 232d and the fifth heat exchange pipe 232 e.
In addition, in other embodiments, the number of the heat exchange pipes 232 in each heat exchange pipe layer 231 can be selected from other suitable values according to requirements.
In this embodiment, the heat exchange pipes 232 in each heat exchange pipe layer 231 are arranged in parallel to facilitate the arrangement of the heat exchange pipes 232, and at the same time, the flow conditions in the heat exchange pipes 232 are similar.
In this embodiment, the same heat exchange tube layer 231 is horizontally arranged parallel to the ground. Specifically, the first heat exchange pipe 232a, the second heat exchange pipe 232b and the third heat exchange pipe 232c are located in the same horizontal plane parallel to the ground; fourth heat exchange tube 232d and fifth heat exchange tube 232e are simultaneously located in another horizontal plane parallel to the ground. In addition, in other embodiments, other suitable arrangements may be provided between the heat exchange pipes 232 in the same heat exchange tube layer 231.
In this embodiment, heat exchange tube 232 is the circular straight pipe to make things convenient for heat exchange tube 232's preparation, reduce heat exchange tube 232's cost, can reduce the on-way resistance loss of water through heat exchange tube 232 simultaneously, reduce heat exchanger 200's hydraulic loss. In addition, in other embodiments, the heat exchanging pipe 232 may also be a pipe with other suitable shapes, such as a square pipe, an arc pipe, and the like.
The number of the first connection pipes 233 for connecting the lower heat exchange tube layer 231b and the upper heat exchange tube layer 231a in series may be one or more. In this embodiment, a first connection pipe 233 is connected between the end of the third heat exchange pipe 232c (i.e., the end of the third heat exchange pipe 232c from which the water flows) and the head end of the fourth heat exchange pipe 232d (i.e., the end of the fourth heat exchange pipe 232d from which the water flows). By the arrangement mode, water can completely pass through the stroke of the lower heat exchange tube layer 231b for heat exchange and then flows into the upper heat exchange tube layer 231a, and then the stroke of the upper heat exchange tube layer 231a is completely finished, so that the heat exchange efficiency of the water is better.
Referring to fig. 7, when the water pressure in the heat exchanger 200 is low, the heat exchange pipe 232 is not easily filled with water in the heat exchange pipe 232, i.e. the water in the heat exchange pipe 232 is in a non-full pipe flow. For the condition that the water in the heat exchange pipe fitting 232 is full pipe flow, because the flow of the water in the heat exchange pipe fitting 232 is reduced, the heat storage capacity of the water in the heat exchange pipe fitting 232 is reduced, and the condition that the water is heated to boiling easily appears.
In this embodiment, a connection elbow 240 is connected between the water outlet pipe 220 and the uppermost heat exchange pipe layer 231. The connecting bend 240 is a U-shaped tube that opens downward. Therefore, when the water pressure is low, the heat exchange pipe 232 of the uppermost heat exchange pipe layer 231 is not directly discharged from the water outlet pipe 220 after being heated, but is gathered in the heat exchange pipe 232 until the heat exchange pipe 232 is in a full pipe flow state, and the water overflows from the U-shaped pipe and is discharged through the water outlet pipe 220. Thereby reducing the probability of water boiling phenomenon in the heat exchanger 200 caused by low water pressure.
Specifically, the connecting elbow 240 includes a rising portion 241, an extending portion 243, and a falling portion 242. The rising portion 241 is connected to the fifth heat exchange pipe 232e, the falling portion 242 is connected to the water outlet pipe 220, the extending portion 243 is connected between the rising portion 241 and the falling portion 242, and both the rising portion 241 and the falling portion 242 are located below the extending portion 243. Fourth heat exchange pipe 232d and fifth heat exchange pipe 232e are located below extension 243. Therefore, when the water pressure is low, the water in the fifth heat exchange pipe 232e is accumulated in the fifth heat exchange pipe 232e under the blockage of the ascending portion 241, and when the fifth heat exchange pipe is full of water, the water flows upward through the ascending portion 241 and flows over the extending portion 243, and then flows into the water outlet pipe 220 from the descending portion 242.
Referring to fig. 2, in some preferred embodiments, the heat exchanger 200 further includes a plurality of heat exchanging fins 260 stacked laterally. The heat exchanger tubes 232 pass through the heat exchanger fins 260 and contact each heat exchanger fin 260. Therefore, the contact area of the heat exchange pipe 232 and the high-temperature flue gas is increased, and the heat exchange efficiency of the heat exchange pipe 232 is improved.
Here, the transverse stacking means that the heat exchange fin 260 is vertically disposed, and the plurality of heat exchange fins 260 are arranged in parallel in a horizontal direction. Therefore, a plurality of vertical gaps are formed between the heat exchange fins 260, and high-temperature flue gas generated by combustion can rise and enter the gaps between the heat exchange fins 260 to exchange heat with the heat exchange fins 260.
Referring to FIG. 2, in some embodiments, the heat exchange assembly 230 further includes a heat exchange coil 237. The heat exchange coil 237 is wound outside the heat exchange housing, one end of the heat exchange coil 237 is connected to the water inlet pipe 210, and the other end is connected to the heat exchange pipe layer 231 located at the lowest position. In this embodiment, heat exchanging coil 237 is connected between inlet tube 210 and first heat exchanging tube 232 a. Therefore, heat exchange is performed between the heat exchange coil 237 and the heat exchange shell, and the heating efficiency of the heat exchanger 200 is improved.
The working mode of the gas water heater of the invention is as follows:
when the gas water heater of the application is used, the burner 100 is turned on, and the high-stage position or the low-stage position is selected according to the heating requirement. The high temperature flue gas generated in the fire row rises, a part of heat is transferred to the heat exchange coil 237 through the heat exchange shell, and a part of heat is transferred to the heat exchange pipe 232 through the heat exchange fin 260. Cold water flows from the inlet pipe 210 into the coil and, in turn, into the lower heat exchange tube layer 231b and the upper heat exchange tube layer 231a. The temperature of flue gas is higher at lower heat transfer tube layer 231b, and the water temperature is lower, and the water temperature is higher at upper heat transfer tube layer 231a, and the flue gas temperature is lower. Thereby making the inside of the heat exchanger 200 less susceptible to water boiling.
Example 2
Example 2 of the present invention is substantially the same as example 1 except that:
referring to fig. 2 and 8, in this embodiment, the three low-stage fire rows 120 are arranged in parallel at intervals, and the arrangement direction of the low-stage fire rows 120 is the same as the arrangement direction of the heat exchange pipes 232. The lower heat exchange tube layer 231b is disposed obliquely, and the heat exchange pipe 232 close to the inflow direction of water is located below the heat exchange pipe 232 close to the outflow direction of water.
Specifically, in the lower heat exchange tube layer 231b, the first heat exchange tube 232a is located below the second heat exchange tube 232b, and the second heat exchange tube 232b is located below the third heat exchange tube 232 c. When the three low-stage fire rows 120 are burning at maximum load, the probability of water boiling in the heat exchange tubes 232 above the low-stage fire rows 120 is also high. Through the arrangement of the heat exchange pipe fittings 232 in the lower heat exchange pipe layer 231b, the heat exchange pipe fittings 232 with lower water temperature in the lower heat exchange pipe layer 231b are closer to the combustor 100, so that the phenomenon of water boiling in the heat exchange pipe fittings 232 of the lower heat exchange pipe layer 231b is further reduced.
In addition, in other embodiments, the upper heat exchange tube layer 231a may also be obliquely disposed, so that the fourth heat exchange tube 232d is located below the fifth heat exchange tube 232e, and thus the temperature of the flue gas contacting the fifth heat exchange tube 232e with a higher water temperature in the upper heat exchange tube layer 231a is lower, and the probability of water boiling in the upper heat exchange tube layer 231a is further reduced.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of this invention, and these changes and modifications are within the scope of this invention.
Claims (10)
1. The utility model provides a heat exchanger, includes inlet tube, outlet pipe and heat exchange assemblies, its characterized in that, heat exchange assemblies includes a plurality of heat transfer pipe layers, and is a plurality of the heat transfer pipe layer is vertical to be piled up and arranges and establish ties in proper order, and is located the below the heat transfer pipe layer with the inlet tube intercommunication is located the top the heat transfer pipe layer with the outlet pipe is linked together.
2. The heat exchanger of claim 1, wherein the heat exchange tube layers comprise heat exchange tube members, and a first connecting tube is arranged between two adjacent heat exchange tube layers and connected between the heat exchange tube members of two adjacent heat exchange tube layers.
3. The heat exchanger of claim 2, wherein each of the heat exchange tube layers comprises at least two heat exchange tube members, a second connecting tube is connected between two adjacent heat exchange tube members in the heat exchange tube layers, and the heat exchange tube members are sequentially connected in series and arranged in a reciprocating and turning-back manner through the second connecting tubes.
4. The heat exchanger of claim 3, wherein the heat exchange tube layer is disposed obliquely, and the heat exchange tube member in the heat exchange tube layer near the water inflow direction is located below the heat exchange tube member near the water outflow direction.
5. The heat exchanger of claim 2, wherein the heat exchange tube member is a straight tube member.
6. The heat exchanger of claim 2, wherein the heat exchange tube members are parallel to each other.
7. The heat exchanger of claim 1, wherein the water inlet tube and the water outlet tube are located on opposite sides of the heat exchange assembly.
8. The heat exchanger of claim 1, wherein a connecting elbow is connected between the water outlet pipe and the uppermost heat exchange pipe layer, and the connecting elbow is a U-shaped pipe fitting which is opened downwards.
9. The heat exchanger of claim 2, further comprising a plurality of heat exchange fins stacked in a transverse direction, wherein the heat exchange tube passes through the heat exchange fins.
10. A gas water heater comprising a heat exchanger according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211017698.9A CN115420020A (en) | 2022-08-24 | 2022-08-24 | Heat exchanger and gas water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211017698.9A CN115420020A (en) | 2022-08-24 | 2022-08-24 | Heat exchanger and gas water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115420020A true CN115420020A (en) | 2022-12-02 |
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ID=84198649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211017698.9A Pending CN115420020A (en) | 2022-08-24 | 2022-08-24 | Heat exchanger and gas water heater |
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| CN (1) | CN115420020A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118149615A (en) * | 2024-05-09 | 2024-06-07 | 杭州老板电器股份有限公司 | Heat exchanger and gas water heater |
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2022
- 2022-08-24 CN CN202211017698.9A patent/CN115420020A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118149615A (en) * | 2024-05-09 | 2024-06-07 | 杭州老板电器股份有限公司 | Heat exchanger and gas water heater |
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