WO2017206304A1

WO2017206304A1 - Fuel gas water heater and heat exchanger for use in fuel gas water heater

Info

Publication number: WO2017206304A1
Application number: PCT/CN2016/092098
Authority: WO
Inventors: 杜小文; 梁国荣; 黄官贤; 陆祖安
Original assignee: 芜湖美的厨卫电器制造有限公司; 美的集团股份有限公司
Priority date: 2016-06-02
Filing date: 2016-07-28
Publication date: 2017-12-07

Abstract

A fuel gas water heater and a heat exchanger (100) for use in the fuel gas water heater. The heat exchanger (100) comprises: a housing (10), where a heat exchanging cavity (101) is defined within the housing (10), a smoke inlet (104) is provided at the upper part of the housing (10) and in communication with the heat exchanging cavity (101), and a smoke outlet (105) is provided at the lower part and in communication with the heat exchanging cavity (101); a main heat exchanger (20) provided within the heat exchanging cavity (101) and arranged between the smoke inlet (104) and the smoke outlet (105); and a condensation heat exchanger (30) provided within the heat exchanging cavity (101) and arranged between the main heat exchanger (20) and the smoke outlet (105). At least a part of the heat exchanging cavity (101) forms a variable diameter cavity, the cross-section area of the variable diameter cavity decreases gradually from top to bottom, and the condensation heat exchanger (30) is provided within the variable diameter cavity.

Description

Gas water heaters and heat exchangers for gas water heaters

Technical field

The invention relates to the technical field of hot water equipment, and more particularly to a gas water heater and a heat exchanger for a gas water heater.

Background technique

Currently on the market most of the gas water heater is partially premixed combustion scheme, this low combustion efficiency of combustion, and can not meet the requirements of low emission of NO _X. High energy efficiency and low emissions full premixed combustion technology has become a trend. In the gas water heater adopting full premixed combustion technology in the related art, the heat exchanger is composed of a main heat exchanger and a condensing heat exchanger, and the main heat exchanger and the condensing heat exchanger are separately arranged and independently installed, and the installation structure is complicated. The size of the heat exchanger is large. In addition, the current shape of heat exchangers in the industry is relatively simple, mostly in a square structure, which is sometimes detrimental to the layout of internal components of gas water heaters.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, the present invention proposes a heat exchanger for a gas water heater, which has high heat exchange efficiency, good smoke exhausting and simple structure, and is easy to manufacture.

The present invention also proposes a gas water heater having the above heat exchanger.

A heat exchanger for a gas water heater according to an embodiment of the first aspect of the present invention includes: a casing having a heat exchange chamber defined therein, and an upper portion of the casing is provided with a smoke inlet communicating with the heat exchange chamber a lower portion of the outer casing is provided with a smoke outlet communicating with the heat exchange chamber; a main heat exchanger, the main heat exchanger is disposed in the heat exchange chamber and located at the inlet and the outlet a condensing heat exchanger disposed in the heat exchange chamber and located between the main heat exchanger and the outlet, wherein at least the heat exchange chamber A portion is formed as a variable diameter chamber, and a cross-sectional area of the variable diameter chamber is decreased from top to bottom, and at least the condensing heat exchanger is disposed in the variable diameter chamber.

The heat exchanger for a gas water heater according to the embodiment of the invention has better heat exchange efficiency, smooth flow of flue gas, good smoke exhausting, simple structure, convenient manufacture, saves internal space of the heat exchanger, and facilitates gas consumption. The internal layout of the water heater provides the possibility of miniaturization of the gas water heater.

Further, the heat exchanger for a gas water heater according to the above embodiment of the present invention may further have the following additional technical features:

According to some embodiments of the present invention, the outer casing includes a front plate, a rear plate, a left plate and a right plate, and the front plate, the rear plate, the left plate and the right plate are enclosed to form the heat exchange chamber that is open and closed. At least one of the front plate, the rear plate, the left plate, and the right plate is formed as an inclined plate, and at least a portion of the inclined plate extends obliquely downward inward.

According to some embodiments of the present invention, the left plate and the right plate respectively extend in an up and down direction, a lower portion of the front plate extends obliquely downward and rearward, and a lower portion of the rear plate extends obliquely downward and forward.

According to some embodiments of the present invention, the angle α between the obliquely extending portion of the inclined plate and the vertical direction ranges from 30 degrees to 60 degrees.

According to some embodiments of the present invention, the heat exchanger further includes: a mounting member, the main heat exchanger and the condensing heat exchanger are disposed on the mounting member, the main heat exchanger including a plurality of parallel and spaced A main heat exchange tube is provided, the condensing heat exchanger comprising a plurality of parallel and spaced condensing heat exchange tubes.

According to some embodiments of the present invention, the heat exchanger further includes: a plurality of main heat exchange fins, wherein the plurality of main heat exchange fins are vertically sleeved on the main heat exchange tube and along an axis of the main heat exchange tube Interspersed.

According to some embodiments of the present invention, the heat exchanger further includes: a plurality of condensing heat exchange sheets, wherein the plurality of condensing heat exchange sheets are sleeved on the condensing heat exchange tubes and along an axial direction of the condensing heat exchange tubes Interspersed.

According to some embodiments of the invention, at least one of the condensing heat exchange tube and the main heat exchange tube is formed as a light pipe or a bellows.

According to some embodiments of the present invention, the heat exchanger further includes: a temperature lowering pipe disposed on an inner wall surface of the heat exchange chamber and above the main heat exchanger.

A gas water heater according to an embodiment of the second aspect of the present invention includes the heat exchanger for a gas water heater according to the embodiment of the first aspect of the present invention.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

1 is a schematic structural view of a heat exchanger according to an embodiment of the present invention;

2 is a top plan view of a heat exchanger in accordance with an embodiment of the present invention;

Figure 3 is a bottom plan view of a heat exchanger in accordance with an embodiment of the present invention;

Figure 4 is a front elevational view of a heat exchanger in accordance with an embodiment of the present invention;

Figure 5 is a right side view of a heat exchanger in accordance with an embodiment of the present invention;

Figure 6 is a cross-sectional view of a heat exchanger in accordance with an embodiment of the present invention;

Figure 7 is a schematic exploded view of a heat exchanger according to an embodiment of the present invention;

Figure 8 is a schematic structural view of a main heat exchanger of a heat exchanger according to an embodiment of the present invention;

9 is a schematic structural view of a main heat exchange tube of a heat exchanger according to an embodiment of the present invention;

Figure 10 is a schematic structural view of a front plate of a heat exchanger according to an embodiment of the present invention;

Figure 11 is a schematic structural view of a left plate of a heat exchanger according to an embodiment of the present invention;

Figure 12 is a schematic view showing the structure of a mounting plate of a heat exchanger according to an embodiment of the present invention.

Reference mark:

Heat exchanger 100;

The outer casing 10; the heat exchange chamber 101; the water inlet 102; the water outlet 103; the inlet 104; the outlet 105; the overflow tank 106; the mounting groove 107; the front plate 11; the rear plate 12; the left plate 13; ;

Main heat exchanger 20; main heat exchange tube 21; main heat exchange sheet 22;

Condensing heat exchanger 30; condensing heat exchange tube 31;

Mounting plate 41; first mounting hole 401; second mounting hole 402; third mounting hole 403; flange 410; mounting leg 420;

Cooling tube 50;

Inlet joint 61; outlet joint 62.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A gas water heater and a heat exchanger 100 for a gas water heater according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to Figures 1 through 12, a heat exchanger 100 for a gas water heater according to an embodiment of the present invention includes a housing 10, a main heat exchanger 20, a condensing heat exchanger 30, and a mount.

The outer casing 10 defines a heat exchange chamber 101. The upper portion of the outer casing 10 is provided with a smoke inlet 104, the lower portion of the outer casing 10 is provided with a smoke outlet 105, the smoke inlet 104 communicates with the heat exchange chamber 101, and the outlet 105 and heat exchange The cavity 101 is in communication. The main heat exchanger 20 is disposed in the heat exchange chamber 101 and located between the inlet port 104 and the outlet port 105. The condensing heat exchanger 30 is disposed in the heat exchange chamber 101 and located at the main heat exchanger 20 and the outlet. between. In other words, the main heat exchanger 20 and the condensing heat exchanger 30 are both located in the heat exchange chamber 101 and located between the inlet 104 and the outlet 105, and the main heat exchanger 20 is located above the condensing heat exchanger 30. The mounting member can be mounted within the outer casing 10, and the main heat exchanger 20 and the condensing heat exchanger 30 can be disposed on the mounting member. That is, the main heat exchanger 20 and the condensing heat exchanger 30 may be formed in a unitary structure and mounted on the outer casing 10 by a mounting member.

Therefore, the main heat exchanger 20 and the condensing heat exchanger 30 can be pre-assembled as a whole with the mounting member, and then installed in the heat exchange chamber 101, which is more convenient to assemble, and can reduce the main heat exchanger 20 and the condensation during the installation process. The risk of damage to the heat exchanger 30 is at the same time convenient for the layout of the components of the gas water heater. A gas water heater having a heat exchanger 100 according to an embodiment of the present invention is During operation, the flue gas formed by the combustion of the gas may enter the heat exchange chamber 101 from the inlet port 104, flow downward in the heat exchange chamber 101, and exchange heat with the main heat exchanger 20 and the condensing heat exchanger 30 in sequence. The vent 105 is discharged, and the water can flow upward, and sequentially passes through the condensing heat exchanger 30 and the main heat exchanger 20 to exchange heat with the flue gas, the heat exchange effect is good, and the flue gas flows smoothly.

Meanwhile, the heat exchanger 100 according to the embodiment of the present invention is formed such that the condensing heat exchanger 30 is below and the main heat exchanger 20 is above, compared with the above-described upper structure in which the condensing heat exchanger is located above the main heat exchanger. The underlying or inverted structure makes the overall structure simpler, and there is no need to provide a water receiving plate for receiving the condensed water of the condensing heat exchanger 30 between the condensing heat exchanger 30 and the main heat exchanger 20, and the condensed water is not It will drip onto the main heat exchanger 20, the structure is simpler, and the flue gas flow process is not blocked by the water receiving plate, the flow is smoother, and the smoke exhausting property is better.

According to the heat exchanger 100 for a gas water heater according to an embodiment of the present invention, the main heat exchanger 20 and the condensing heat exchange can be realized by providing a mounting member and arranging the main heat exchanger 20 and the condensing heat exchanger 30 on the mounting member. The integrated installation of the device 30 is easy to assemble, and the inverted mounting structure is more conducive to the flow of smoke, the structure is simpler, easier to manufacture, simplifies the process, and reduces the risk of air leakage.

Alternatively, the main heat exchanger 20 and the condensing heat exchanger 30 may be welded together with the mounting member to form a unitary body. Thereby, it is not only convenient to manufacture and assemble, but also structurally stable.

The structure of the condensation chamber is not particularly limited and may be a square which is commonly used in the related art, and may be other shapes. In some preferred embodiments of the present invention, at least a portion of the heat exchange chamber 101 is formed as a variable diameter chamber, the cross-sectional area of the variable diameter chamber is decreased from top to bottom, and at least the condensation heat exchanger 30 is disposed in the variable diameter chamber. . In other words, the cross-sectional area of the heat exchange chamber 101 can be changed, and the condensing heat exchanger 30 can be disposed at a position where the cross-sectional area changes, and from the top to the bottom, the heat exchange chamber 101 can change only a part of the cross-sectional area. That is, the portion of the heat exchange chamber 101 is a variable diameter chamber, and the entire cross-sectional area may be changed, that is, the heat exchange chamber 101 is integrally formed into a variable diameter chamber, wherein the cross-sectional area of the variable diameter chamber is decreased from top to bottom. Thereby formed into a neck-up structure from top to bottom, the condensing heat exchanger 30 is disposed in the neck-type structure, and the main heat exchanger 20 may or may not be disposed in the neck-type structure as needed.

During the flow of the flue gas in the heat exchange chamber 101, it first passes through a relatively large-sized portion and then passes through a relatively small-sized portion. Thereby, the heat exchange efficiency can be obtained, and the size at the outlet is relatively large, and the flue gas is easily introduced into the heat exchange chamber 101, and the flow speed of the flue gas at the outlet 105 can be improved, which is more conducive to exhausting smoke. . At the same time, the heat exchange chamber 101 has good matching with the main heat exchanger 20 and the condensing heat exchanger 30, and can provide a relatively large installation space for the relatively large-sized main heat exchanger 20, which is relatively small in size. The condensing heat exchanger 30 provides a space suitable for the space, which saves the internal space of the heat exchanger 100, and at the same time allows more space for the gas water heater to install other components, which facilitates the internal layout of the gas water heater. It provides the possibility of miniaturization of gas water heaters.

In some embodiments of the present invention, the condensing heat exchanger 30 is generally located at a lower portion of the heat exchange chamber 101. Therefore, a lower portion of the heat exchange chamber 101 is formed as a variable diameter chamber, and an upper portion of the heat exchange chamber 101 may be a variable diameter chamber. Can be constant for the cross-sectional area The radial cavity is to facilitate the installation of the main heat exchanger 20 and the entry of flue gas. For example, as shown in FIGS. 1 to 7, the condensing heat exchanger 30 is generally located at a lower portion of the heat exchange chamber 101, the main heat exchanger 20 is located substantially at the center of the heat exchange chamber 101, and the upper portion of the variable diameter chamber 101 is formed to have a cross-sectional area. The constant diameter chamber is formed, and the lower portion of the heat exchange chamber 101 is formed as a variable diameter chamber that extends upward to the middle of the main heat exchanger 20.

As shown in FIG. 1, the heat exchanger 100 according to an embodiment of the present invention may further include a cooling pipe 50 located at an upper portion of the heat exchange chamber 101 and above the main heat exchange tube 21, and the cooling tube 50 may be disposed at the outer casing 10 on the inner wall surface. Therefore, the cooling pipe 50 can cool the outer casing 10 and isolate the outer casing 10 from smoke, preventing the high-temperature flue gas entering from the air inlet 104 from directly impinging on the inner wall surface of the outer casing 10, causing high temperature on the outer casing 10. Damaged, the heat exchanger 100 has improved temperature resistance and is less prone to damage.

The mounting member is not particularly limited, and for example, the mounting member may be a plate body or a shelf or the like. Alternatively, according to some embodiments of the present invention, the mounting member may include two mounting plates 41 disposed at both ends of the main heat exchanger 20 and the condensing heat exchanger 30, respectively. That is, both ends of the main heat exchanger 20 are respectively connected to the two mounting plates 41, and both ends of the condensing heat exchanger 30 are also connected to the two mounting plates 41, respectively. As shown in FIG. 1 and FIG. 7, the two mounting plates 41 are spaced apart in the left-right direction, and the left end and the right end of the main heat exchanger 20 are respectively connected to the two mounting plates 41, and the left end and the right end of the condensing heat exchanger 30 are respectively It is connected to two mounting plates 41. The two mounting plates 41 can support and protect the main heat exchanger 20 and the condensing heat exchanger 30, and the heat exchanger 100 has good structural stability and heat exchange performance.

As shown in FIGS. 1 to 7, the upper end of the outer casing 10 may be open to form a smoke inlet 104, and the upper end of the mounting plate 41 may be provided with an outwardly bent flange 410, and the flange 410 may protrude from the inlet 104 and Supported on the edge of the smoke inlet 104. Thereby, the secure mounting of the mounting plate 41 can be ensured, and the mounting plate 41 can transmit the force to the outer casing 10 so that the outer casing 10 and the mounting plate 41 can collectively withstand the forces of the main heat exchanger 20 and the condensing heat exchanger 30, reducing The mounting plate 41 is subjected to excessive force and the risk of damage, the structural stability and reliability of the heat exchanger 100 are improved, and the installation of the heat exchanger 100 is facilitated.

In addition, in order to facilitate the installation of the heat exchanger 100, the mounting plate 41 may further be provided with mounting legs 420. Specifically, as shown in FIG. 1 and FIG. 12, two mounting plates 41 are respectively provided with a mounting leg 420 for installation. The legs 420 extend from the rear side of the outer casing 10 to facilitate connection with other components. The mounting legs 420 may be formed as a bent structure as shown in Fig. 1, and of course, may be formed as other structures that may be easily connected. As shown in FIG. 7, the flange 410 can be disposed not only at the upper end of the mounting plate 41, but also at the lower end of the mounting plate. The flange 410 can extend out of the casing 10 to facilitate the assembly operation of the heat exchanger 100. Here, in FIG. 12, (a) is a plan view of the mounting board 41, and (b) is a left side view of the mounting board 41, that is, a view in which the mounting board 41 is separately observed from the left side of the casing 10.

The structure of the outer casing 10 may be formed in various forms. As shown in FIGS. 1 and 7, the outer casing 10 may include a front plate 11, a rear plate 12, a left plate 13 and a right plate 14, a front plate 11, a rear plate 12, and a left plate 13. The heat exchanger chamber 101 is formed by enclosing the right plate 14. The upper and lower ends of the heat exchange chamber 101 are open, and the upper end is open to form the inlet port 104, and the lower end is open to form the outlet port 105. Optionally, the front panel 11, At least one of the rear plate 12, the left plate 13, and the right plate 14 is formed as an inclined plate, and at least a portion of the inclined plate extends obliquely downward inward. Here, "inward" refers to a direction from the outside of the heat exchange chamber 101 to the inside of the heat exchange chamber 101.

In other words, one, two, three or all of the front plate 11, the rear plate 12, the left plate 13, and the right plate 14 are inclined plates, and at least one of the upper, middle, and lower portions of the inclined plate extends obliquely downward inward. When one, two or three of the front panel 11, the rear panel 12, the left panel 13 and the right panel 14 are inclined plates, the remaining ones of the front panel 11, the rear panel 12, the left panel 13 and the right panel 14 Three, the other two or the other is a straight plate extending with respect to the vertical direction, wherein when a part of the inclined plate is bent downwardly and inwardly, the inclined plate may be formed as a bent plate; when the inclined plate is all oriented When the lower inward bending is extended, the inclined plate is formed substantially as a straight plate that extends obliquely with respect to the vertical direction. Thereby, the front plate 11, the rear plate 12, the left plate 13, and the right plate 14 can be enclosed to form a heat exchange chamber 101 having a relatively small lower portion and a relatively large upper portion, and the outer casing 10 is easy to manufacture and assemble.

For example, as shown in FIGS. 1, 3, and 10, the left plate 13 and the right plate 14 respectively extend in the up and down direction, the lower portion of the front plate 11 extends obliquely downward and rearward, and the lower portion of the rear plate 12 extends obliquely downward and forward. . Thereby, the heat exchange chamber 101 can form a lower constricted structure through the cooperation of the lower portion of the front plate 11 and the lower portion of the rear plate 12, and the gas flowability is good. The mounting member is connected to the left plate 13 and the right plate 14, that is, the mounting plate 41 on the left side may be connected to the left plate 13, the mounting plate 41 on the right side may be connected to the right plate 14, and the left plate 13 and the right plate 14 are respectively formed. It is a straight plate, so that the two mounting plates 41 can also be formed as a substantially straight plate, which can effectively ensure the supporting effect on the main heat exchanger 20 and the condensing heat exchanger 30, and is not easily damaged.

In Fig. 10, (a) is a front view of the front panel 11, and (b) is a left side view of the front panel 11. In Fig. 11, (a) is a view when the left panel 13 is separately observed from the right side of the casing 10, that is, a right side view of the left panel 13, and (b) when the left panel 13 is separately observed while standing on the front side of the casing 10. The view, that is, the front view of the left panel 13.

As shown in FIG. 1, FIG. 7, and FIG. 10, the cooling pipe 50 may be disposed on the front plate 11 and the rear plate 12. The rear side of the front plate 11 and the front side of the rear plate 12 may be provided with a mounting groove 107 for cooling. The tube 50 can be disposed within the mounting recess 107 to achieve an accurate and secure mounting of the cooling tube 50.

Alternatively, according to some embodiments of the present invention, the angle α between the obliquely extending portion of the inclined plate and the vertical direction may range from 30 degrees to 60 degrees. That is to say, the angle α between the obliquely extending portion of the inclined plate and the vertical direction may be 30 degrees, or 60 degrees, or may be a value between 30 degrees and 60 degrees, for example, 40 degrees, 45 degrees. Degree or 50 degrees, etc. Therefore, the inclination angle of the inclined plate is moderate, which is not only convenient for manufacturing, but also the dimensional change of the heat exchange chamber 101 is slow and the size of the smoke outlet 105 formed is suitable, ensuring smooth flow of the flue gas, good smoke generation performance, and heat exchange. The effect is good.

As shown in FIG. 6 and FIG. 7, the main heat exchanger 20 may include a plurality of main heat exchange tubes 21, and a plurality of main heat exchange tubes 21 are arranged in parallel and spaced apart, and an adjacent two main heat exchange tubes 21 are formed. There is a smoke gap, and the water inlet port 102 and the water outlet 103 are provided on the outer casing 10. For the purpose of assembling and feeding water, the water inlet port 61 and the water outlet port 103 can be respectively provided with a water inlet joint 61 and a water outlet joint 62. The mounting plate 41 cooperates with the outer casing 10 to define a water passage, a water passage and a water inlet 102, and a water outlet. Port 103 is connected. The mounting plate 41 may be provided with a plurality of first mounting holes 401, and each of the main heat exchange tubes 21 extends through the corresponding first mounting holes 401 into the water passage.

That is, the two ends of each main heat exchange tube 21 are respectively sealed and penetrated in the corresponding mounting plates 41 and protrude into the corresponding water passages, so that the main heat exchange tubes 21 can communicate with the water passages, and The two mounting plates 41 can support both ends of the main heat exchanger 20, and the supporting effect is good. The high-temperature flue gas entering the heat exchange chamber 101 from the inlet port 104 can flow from the cross-smoke gap between the plurality of main heat exchangers 20, and exchange heat with the plurality of main heat exchange tubes 21, and the flue gas flows evenly. And heat exchange is good. In order to ensure good joint sealing, the main heat exchange tube 21 can be welded to the circumference of the first mounting hole 401.

Optionally, at least one side of the mounting plate 41 facing away from the main heat exchanger 20 and one side of the outer casing 10 facing the mounting plate 41 may be provided with a water tank 106, and the water tank 106 is attached to the outer casing 10 at the mounting plate 41. A water passage can be formed. In other words, the outer side surface of the mounting plate 41 and/or the inner side surface of the outer casing 10 may be provided with a water tank 106 which may form a water passage when the outer side surface of the mounting plate 41 is in contact with the inner side surface of the outer casing 10. Thereby, not only the manufacturing is convenient, but also the water flowability is good.

For example, as shown in FIGS. 7, 11, and 12, the mounting plate 41 is formed as a flat plate, and the inner side surface of the outer casing 10 is provided with a water tank 106, and the opening of the water tank 106 is recessed inwardly and outwardly. Thus, when the mounting plate 41 is assembled with the outer casing 10, the mounting plate 41 can close the over-water tank 106 to form a water passage. Thereby, the mounting plate 41 is not only convenient to manufacture, but also has high structural strength, and can ensure the supporting effect on the main heat exchange tube 21.

More preferably, the water passage may include a plurality of spaced apart sub-channels that communicate with the plurality of main heat exchange tubes 21 to form a water flow path. In other words, water flowing from the water inlet 102 into one sub-channel can flow into the other sub-channel through one or more main heat exchange tubes 21, and then flow into the third sub-channel through one or more main heat exchange tubes 21. By analogy, the water flowing into the last sub-channel can flow out through the water outlet 103. The water entering from the water inlet 102 can form a complete water flow path between the plurality of main heat exchange tubes 21 and the water passage, water can form a turbulent flow in the heat exchange chamber 101, and the water flow path is long, and the smoke The heat exchange time of the gas is long and sufficient, the heat exchange effect is good, and the efficiency is high.

As shown in FIG. 6 and FIG. 7, the condensing heat exchanger 30 may include a plurality of condensing heat exchange tubes 31, and the plurality of condensing heat exchange tubes 31 may be spaced apart and arranged in parallel, between adjacent two condensing heat exchange tubes 31. A plurality of second mounting holes 402 may be formed on the mounting plate 41, and each of the condensing heat exchange tubes 31 may extend into the water passage through the corresponding second mounting hole 402. The condensing heat transfer tube 31 may be located between the water inlet 102 and the main heat exchange tube 21.

Thus, the condensing heat exchange tube 31 and the main heat exchange tube 21 can be connected to form a water flow path, and water enters a sub-channel of the water passage from the water inlet 102, and then enters the condensing heat exchange tube 31 to generate heat with the flue gas. After the exchange, it enters the main heat exchange tube 21, exchanges heat with the flue gas again, and finally flows out from the water outlet 103 through a sub-channel of the water passage, the heat exchange is more sufficient, the heat utilization rate of the flue gas is high, and the energy efficiency is high. Higher.

In order to increase the flow rate of water, a plurality of condensing heat transfer tubes 31 are arranged side by side on the water circulation path. That is, among the plurality of sub-channels inserted by the condensing heat exchange tube 31, each sub-channel is in communication with at least two condensing heat exchange tubes 31, and is composed of an inlet water passage, a main heat exchange tube 21, and a condensing heat exchange tube 31. On the water circulation path, water can flow simultaneously between the plurality of condensing heat transfer tubes 31 arranged side by side, and simultaneously flow into a main heat exchange tube 21 so that a water circulation path can be formed side by side at the condensing heat exchanger 30. Multiple streams of water. Thereby, the condensing heat transfer tubes 31 having a relatively small radial dimension can be well matched with the main heat exchange tubes 21 having a relatively large radial size, ensuring a smooth flow of water and a heat exchange effect.

As shown in Fig. 7, a plurality of condensing heat exchange tubes 31 can be divided into two groups, the front group has eight condensing heat exchange tubes 31, the latter group has seven condensing heat exchange tubes 31, and the front group has eight. One end of the condensing heat exchange tube 31 simultaneously extends into one sub-channel directly communicating with the water inlet 102, and the other end simultaneously extends into the other sub-channel, and the latter group of seven condensing heat exchange tubes 31 are simultaneously connected to the passage. . After the water enters from the water inlet 102, it can simultaneously enter the first eight condensing heat transfer tubes 31, and then simultaneously split into the next seven condensing heat exchange tubes 31, and then flow into the main heat exchange tubes 31.

In addition, in actual manufacturing, the two sets of condensing heat exchange tubes 31 are spaced apart by a large distance. In order to make the flue gas flow more uniform, a mounting tube can be arranged in the gap between the two sets of condensing heat exchange tubes 31, and the mounting tube and the mounting tube are The two sets of condensing heat transfer tubes 31 are spaced apart and spaced apart by a distance substantially the same as the distance between adjacent two condenser tubes 31. Thereby, it is ensured that the flue gas can pass uniformly through the condensing heat exchanger 30.

As shown in FIG. 6 and FIG. 7, the condensing heat exchange tube 31 and the mounting tube can be formed as a circular tube, and the radial size of the condensing heat exchange tube 31 is larger than the radial dimension of the mounting tube, and the two ends of the mounting tube can be combined with two The mounting plates 41 are connected and are not worn in the two mounting plates 41 to avoid smoke leakage. Alternatively, the mounting tube can be welded to the two mounting plates 41 to facilitate assembly and improve mounting robustness. Wherein, the mounting tube can be directly welded to the two mounting plates 41, or can be welded by other components. As shown in FIGS. 3, 6, and 7, the mounting tube is connected to the condensing heat exchange tube 31 through the mounting bracket.

For the structure with the cooling pipe 50, the cooling pipe 50 can also be fixed on the mounting member. Specifically, as shown in FIG. 7 and FIG. 12, the mounting plate 41 can be provided with a third for inserting the cooling pipe 50. The mounting hole 403, the two ends of the cooling pipe 50 can be respectively inserted in the corresponding third mounting hole 403 and connected to the corresponding sub-channel. At this time, the cooling pipe 50 can also be located in the main heat exchange tube 21 and the condensation heat exchange tube. On the water circulation path formed by 31, water enters from the water inlet 102, and can sequentially pass through the condensing heat exchange tube 31, the main heat exchange tube 21, and the temperature reducing tube 50, and finally flows out from the water outlet 103, and the heat exchange rate between the water and the flue gas increases. The heat exchange time is prolonged and the heat exchange effect is further improved.

As shown in FIG. 1 to FIG. 8, the heat exchanger 100 according to an embodiment of the present invention may further include a plurality of main heat exchange sheets 22, and a plurality of main heat exchange sheets 22 are vertically sleeved on the main heat exchange tubes 21 and along the main The heat transfer tubes 21 are axially spaced apart. In other words, the main heat exchanger 20 includes not only the plurality of main heat exchange tubes 21 but also a plurality of main heat exchange sheets 22, and the plurality of main heat exchange sheets 22 are sequentially sleeved on the main heat exchange tubes 21, and each main heat exchange unit The tube 21 is perpendicular to the main heat exchange sheet 22, and the plurality of main heat exchange sheets 22 are along the main heat exchange tube 21 The axial spacing is open.

Therefore, a smoke inlet gap can also be formed between the adjacent two main heat exchange sheets 22, the flue gas can exchange heat with the main heat exchange sheet 22, and the main heat exchange sheet 22 can transfer the exchanged heat to the main exchange. The heat pipe 21 can increase the heat exchange area and improve the heat exchange effect. As shown in FIG. 7, a plurality of main heat exchange sheets 22 may be first joined into one unit during assembly, and the main heat exchange tubes 21 are inserted into the unitary structure for easy assembly.

Similarly, the heat exchanger 100 according to the embodiment of the present invention may further include a plurality of condensing heat exchange sheets (not shown), and the plurality of condensing heat exchange sheets may be sleeved on the condensing heat exchange tubes 31 and exchange heat along the condensation. The tubes 31 are axially spaced apart. Thereby, the condensing heat exchange sheet can increase the heat exchange area of the condensing heat exchanger 30, and further improve the heat exchange effect.

According to some embodiments of the present invention, at least one of the condensation heat exchange tubes 31 and the main heat exchange tubes 21 may be formed as a light pipe or a bellows. That is to say, the condensing heat exchange tube 31 can be formed as a light pipe or a bellows, and the main heat exchange tube 21 can also be formed as a light pipe or a bellows, which can be flexibly adapted according to assembly requirements, heat exchange requirements, and smoke flow conditions. select. Here, the light pipe is a tube having a smooth surface, and the outer peripheral surface of the tube is formed into a smooth surface, and the bellows is a tube having a corrugated surface, and the outer peripheral surface of the tube is formed with corrugations or threads.

As shown in FIGS. 6 to 9, the main heat exchange tube 21 may be formed as a flat tube whose size in the vertical direction is larger than that in the horizontal direction. Thereby, the size of the main heat exchange tube 21 in the flow direction of the flue gas can be made larger than the dimension perpendicular to the flow direction of the flue gas, not only can ensure the smooth flow of the flue gas, but also can increase the contact area with the flue gas. To improve the heat exchange effect. In Fig. 9, (a) is a plan view of the main heat exchange tube 21 when it is laid flat, and (b) a side view of the main heat exchange tube 21 when it is laid flat.

The heat exchanger 100 shown in FIGS. 1 to 12 will be described as an example. When the gas water heater having the heat exchanger 100 is in use, the high temperature flue gas generated by the gas water heater can enter the heat exchange chamber from the inlet 104. In 101, the flue gas flows downward, passes through the cooling pipe 50, the main heat exchanger 20 and the condensing heat exchanger 30 in sequence, and flows out from the vent 105, at the same time, the water flows in from the water inlet 102 and enters the condensation exchange. In the heat exchanger 30, the water passes through eight condensing heat exchange tubes 31 and seven condensing heat exchange tubes 31 at the same time, and the water is successively formed into eight and seven streams of water, which exchange heat with the flue gas, and the water temperature rises in the flue gas. The carried water vapor can be condensed and condensed on the wall of the condensing heat exchange tube 31. Then, the water continues to enter the main heat exchanger 30, and the water flows around the main heat exchange tube 31, and the water and the flue gas reoccur After the heat exchange, the heat of the flue gas is fully absorbed, the water temperature rises again, after which the water continues to flow into the cooling pipe 50, the water is divided into three strands, and flows in the three cooling pipes 50, and heat exchange with the flue gas again occurs, the water temperature Increase again, the heat exchange between water and flue gas is sufficient, smoke The heat can be fully recycled and the energy recovery effect is good.

Wherein, since the main heat exchanger 20 and the condensing heat exchanger 30 are integrally assembled, the process is simplified, the risk of air leakage is reduced, and the heat exchange chamber 101 has a reduced contraction shape from top to bottom, which is more favorable for condensation heat transfer. The heat exchange effect of the condensing heat exchanger 30 is improved, and the heat exchange efficiency required can be achieved without increasing the condensing heat exchange sheet.

A gas water heater according to an embodiment of the present invention may include a heat exchanger 100 according to an embodiment of the present invention. Due to The heat exchanger 100 of the embodiment of the invention has the above-mentioned beneficial technical effects. Therefore, the gas water heater according to the embodiment of the invention is convenient to manufacture and assemble, has good smoke generation and good heat exchange effect.

Other configurations and operations of gas water heaters in accordance with embodiments of the present invention will be apparent to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientation or positional relationship of the "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, only It is to be understood that the invention is not to be construed as a limitation of the invention.

In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one piece; it may be a mechanical connection, or it may be an electrical connection or a communication with each other; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship between two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the specification, the description of the terms "embodiment", "specific embodiment", "example" or "specific example" and the like means that the specific features, structures, materials or features described in connection with the embodiment or the examples are included. In at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims

A heat exchanger for a gas water heater, comprising:

a housing having a heat exchange chamber defined therein, an upper portion of the housing is provided with a smoke inlet communicating with the heat exchange chamber, and a lower portion of the housing is provided with a smoke outlet communicating with the heat exchange chamber;

a main heat exchanger, the main heat exchanger is disposed in the heat exchange chamber and located between the inlet and the outlet;

a condensing heat exchanger, the condensing heat exchanger being disposed in the heat exchange chamber and located between the main heat exchanger and the outlet, wherein at least a portion of the heat exchange chamber is formed to be reduced in diameter a cavity, the cross-sectional area of the variable-diameter cavity is decreased from top to bottom, and at least the condensing heat exchanger is disposed in the variable-diameter cavity.
A heat exchanger for a gas water heater according to claim 1, wherein said outer casing comprises a front plate, a rear plate, a left plate and a right plate, said front plate, rear plate, left plate and right plate The heat exchange chamber is formed to open up and down, and at least one of the front plate, the rear plate, the left plate and the right plate is formed as an inclined plate, and at least a portion of the inclined plate extends obliquely downward inward.
The heat exchanger for a gas water heater according to claim 2, wherein the left plate and the right plate respectively extend in an up and down direction, and a lower portion of the front plate extends obliquely downward and rearward, The lower portion of the rear plate extends obliquely downward and forward.
The heat exchanger for a gas water heater according to claim 2, wherein an angle α between the obliquely extending portion of the inclined plate and the vertical direction ranges from 30 degrees to 60 degrees.
The heat exchanger for a gas water heater according to any one of claims 1 to 4, further comprising: a mounting member, the main heat exchanger and the condensing heat exchanger being disposed in the mounting In the piece, the main heat exchanger comprises a plurality of parallel and spaced main heat exchange tubes, and the condensing heat exchanger comprises a plurality of parallel and spaced condensing heat exchange tubes.
The heat exchanger for a gas water heater according to claim 5, further comprising: a plurality of main heat exchange sheets, wherein the plurality of main heat exchange sheets are vertically sleeved on the main heat exchange tubes and Along the axial direction of the main heat exchange tube.
The heat exchanger for a gas water heater according to claim 5, further comprising: a plurality of condensing heat exchange sheets, wherein the plurality of condensing heat exchange sheets are sleeved on the condensing heat exchange tubes and along The condensing heat exchange tubes are axially spaced apart.
The heat exchanger for a gas water heater according to claim 5, wherein at least one of the condensation heat exchange tube and the main heat exchange tube is formed as a light pipe or a bellows.
The heat exchanger for a gas water heater according to any one of claims 1 to 8, further comprising: a temperature reducing pipe provided on an inner wall surface of the heat exchange chamber and located at the Above the main heat exchanger.
A gas water heater characterized by comprising a heat exchanger for a gas water heater according to any one of claims 1-9.