Gas water heater

Abstract

This utility model discloses a gas water heater, relating to the field of water heater technology. The gas water heater includes a combustion chamber shell, a heat exchanger, and a burner. A combustion chamber is formed within the combustion chamber shell. The heat exchanger is located above the combustion chamber and includes a heat exchanger frame and a heat exchanger body disposed within the frame, the frame being connected to the combustion chamber shell. The burner is located below the combustion chamber and includes a burner frame and a burner body disposed within the frame, the frame being connected to the shell. At least two of the inner wall surfaces of the combustion chamber, the heat exchanger frame, and the burner frame are provided with heat-reflective layers. This utility model's technical solution can reduce the surface temperature of the combustion chamber shell and improve heat utilization efficiency.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a gas water heater. Background Technology

[0002] A gas water heater is a gas-fired device that uses gas as fuel and heats water by transferring heat to cold water flowing through a heat exchanger.

[0003] Because the gas burns in the combustion chamber, the walls of the combustion chamber, the walls connected to the burner, and the walls connected to the heat exchanger will be very hot. This can easily transfer high-temperature heat energy to the outside and damage other components of the gas water heater, resulting in heat loss and low heat utilization. Utility Model Content

[0004] The main purpose of this invention is to propose a gas water heater that can reduce the surface temperature of the combustion chamber shell and improve the heat utilization rate.

[0005] To achieve the above objectives, the gas water heater proposed in this utility model includes:

[0006] A combustion chamber shell, in which a combustion chamber is formed;

[0007] A heat exchanger is located above the combustion chamber; the heat exchanger includes a heat exchanger frame and a heat exchange body disposed within the heat exchanger frame, the heat exchanger frame being connected to the combustion chamber shell; and

[0008] A burner is located below the combustion chamber. The burner includes a burner frame and a burner body disposed within the burner frame. The burner frame is connected to the combustion chamber shell.

[0009] At least two of the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame, and the inner wall surface of the burner frame are provided with a heat reflective layer.

[0010] In one embodiment of this application, the heat reflective layer is provided on the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame, and the inner wall surface of the burner frame.

[0011] In one embodiment of this application, the heat-reflective layer is a coating structure.

[0012] In one embodiment of this application, the heat reflective layer includes a primer layer and a topcoat layer. The primer layer is coated on the surface of at least two of the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame, and the inner wall surface of the burner frame. The topcoat layer is coated on the surface of the primer layer for reflecting heat.

[0013] In one embodiment of this application, the thickness h1 of the topcoat layer satisfies: 10μm≤h1≤500μm; and the thickness h2 of the primer layer satisfies: 10μm≤h2≤600μm.

[0014] In one embodiment of this application, the heat reflective layer is a plate-like structure or a film structure.

[0015] In one embodiment of this application, the thermal reflectivity of the heat-reflective layer is not less than 0.7;

[0016] And / or, the heat reflective layer has a temperature tolerance of not less than 800°C.

[0017] In one embodiment of this application, the heat exchanger frame includes:

[0018] Two opposing mounting plates are integrally connected to opposite sides of the combustion chamber housing, respectively;

[0019] Two opposing end plates are respectively installed between the two mounting plates, the heat exchange body is installed between the two end plates, and the two mounting plates are respectively located on both sides of the heat exchange body;

[0020] The heat-reflective layer is provided on the mounting plate and / or the end plate.

[0021] In one embodiment of this application, the burner frame includes:

[0022] The outer frame is connected to the combustion chamber housing, and the burner body is located within the outer frame; and

[0023] A fire baffle is provided on the inner wall of the outer frame and located above the burner body;

[0024] The heat-reflective layer is provided on the fire shield.

[0025] In one embodiment of this application, a fan is also included, which is disposed above the heat exchanger;

[0026] Alternatively, the fan may be located below the burner.

[0027] In this utility model's gas water heater, a heat-reflecting layer is provided in at least two of the burner frame, combustion chamber shell, and heat exchanger frame. This heat-reflecting layer reflects heat towards the inner cavity, reducing the heat transferred outward to the burner frame, combustion chamber shell, and heat exchanger frame. This prevents the wall temperatures of the burner frame, combustion chamber shell, and heat exchanger frame from becoming too high, effectively improving the temperature rise during water outages. Simultaneously, the heat-reflecting layer reflects the heat radiated onto it back into the combustion chamber for reuse, preventing heat loss and improving heat utilization efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a partial cross-sectional schematic diagram of an embodiment of the gas water heater of this utility model.

[0030] Figure 2 This is a schematic diagram of the assembly structure of the heat exchanger, combustion chamber shell, and burner in the gas water heater of this utility model.

[0031] Figure 3 This is a schematic diagram of the structure of the combustion chamber shell, heat exchanger, and heat reflector layer in an embodiment of this utility model.

[0032] Figure 4 for Figure 3 Explosion diagram in the embodiment;

[0033] Figure 5 This is a schematic diagram of the structure of the combustion chamber shell and the heat reflective layer in an embodiment of this utility model;

[0034] Figure 6 This is an exploded structural diagram of the bottom frame and heat reflective layer in an embodiment of this utility model;

[0035] Figure 7 This is a schematic diagram of the bottom frame structure in an embodiment of this utility model;

[0036] Figure 8 This is an exploded structural diagram of the cover plate and heat reflective layer in an embodiment of this utility model;

[0037] Figure 9 This is a schematic diagram of the structure of the heat-reflective layer in an embodiment of this utility model.

[0038] Explanation of icon numbers:

[0039] 1 Combustion chamber shell 222 heat exchanger tube 11 bottom frame 3 burner 111 Back panel 31 Burner frame 112 Side panel 311 Outer frame 12 cover plate 312 Fire shield 2 heat exchanger 32 Burner body 21 Heat exchanger frame 4 heat reflector 211 Mounting plate 41 primer layer 212 end plate 42 Topcoat layer 22 Heat exchanger body 5 Fan 221 Fin assembly

[0040] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0043] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] Gas burns in the combustion chamber, where the shell temperature is high. To prevent the high-temperature heat from the combustion chamber from transferring outwards and damaging other components of the gas water heater, the shell of the combustion chamber needs to be cooled. Related technologies utilize a double or triple-layer shell for the combustion chamber to create an air-cooling channel, thereby cooling the outer surface of the combustion chamber shell using airflow.

[0046] When a user turns off the water supply, the water in the heat exchanger stops flowing. The heat stored in the combustion chamber shell and heat exchanger fins is transferred to the stagnant water, causing its temperature to rise. When the user turns the water back on, the abnormally heated water flows through the pipes to the user's outlet, causing a scalding sensation – this is known as "water-off temperature rise." However, in related technologies, the combustion chamber shell is designed with double or triple layers of sheet metal, increasing the total heat storage capacity. More heat is transferred to the heat exchanger to heat the stagnant water, further exacerbating the problem of excessive temperature rise during water-off periods. Furthermore, heat is carried away by cold air, leading to heat loss and reduced thermal efficiency.

[0047] Therefore, this utility model proposes a gas water heater that aims to reduce the surface temperature of the combustion chamber shell, reduce heat loss, and improve heat utilization.

[0048] In the embodiments of this utility model, such as Figures 1 to 4 As shown, the gas water heater includes a combustion chamber shell 1, a heat exchanger 2, and a burner 3;

[0049] A combustion chamber is formed inside the combustion chamber shell 1; a heat exchanger 2 is located above the combustion chamber, and the heat exchanger 2 includes a heat exchanger frame 21 and a heat exchanger body 22 disposed within the heat exchanger frame 21, and the heat exchanger frame 21 is connected to the combustion chamber shell 1; a burner 3 is located below the combustion chamber, and the burner 3 includes a burner frame 31 and a burner body 32 disposed within the burner frame 31, and the burner frame 31 is connected to the combustion chamber shell 1;

[0050] At least two of the inner wall surfaces of the combustion chamber, the heat exchanger frame 21, and the burner frame 31 are provided with heat reflective layers 4.

[0051] Understandably, a gas water heater also includes a fan 5 and a burner 3 for ignition and combustion. The combustion chamber provides the space for the combustion of gas and air. After the gas and air mix and burn, the resulting high-temperature flue gas flows upward to the heat exchanger 2 to heat the components to be heated (such as water pipes) in the heat exchanger 2. The fan 5 drives the gas and air into the combustion chamber for combustion and transports the high-temperature flue gas after combustion to the heat exchanger 2 for heat exchange, and then discharges the exhaust gas after heat exchange.

[0052] The heat exchanger 2 is located above the combustion chamber. It can be installed inside the combustion chamber shell 1, or it can be installed above the combustion chamber shell 1. When the heat exchanger 2 is installed inside the combustion chamber shell 1, the combustion chamber shell 1 can directly cover the heat exchange body 22 of the heat exchanger 2, or it can cover the exterior of the heat exchanger 2 itself, such as the exterior of a copper sheet. When the heat exchanger 2 is installed above the combustion chamber shell 1, the heat exchanger 2 has its own independent heat exchanger frame 21, which is connected to the combustion chamber shell 1. Optionally, the heat exchanger body 22 includes multiple heat exchange tubes 222 mounted on the heat exchanger frame 21 and fin assemblies 221 disposed on the heat exchange tubes 222.

[0053] The burner 3 is located below the combustion chamber and is connected to the combustion chamber shell 1 via the burner frame 31. This allows the burner body 32 to inject fuel gas and air into the combustion chamber, enabling the fuel gas and air to ignite and burn smoothly within the combustion chamber. The high-temperature flue gas generated by combustion can flow to the heat exchanger 2 for heat exchange. Optionally, the burner body 32 can be a burner array structure.

[0054] In practical applications, the flame burns near the exhaust port of the burner body 32. The high-temperature flue gas generated by combustion flows from the combustion chamber to the heat exchanger 2. Therefore, the temperature of the burner frame 31, combustion chamber shell 1, and heat exchanger frame 21 along the high-temperature flue gas path will be very high, and heat is easily lost outward from these walls. Based on this, this embodiment provides a heat-reflecting layer 4 in at least two of the burner frame 31, combustion chamber shell 1, and heat exchanger frame 21. This heat-reflecting layer 4 reflects heat towards the inner cavity, reducing the heat transferred outward to the burner frame 31, combustion chamber shell 1, and heat exchanger frame 21, preventing excessively high wall temperatures and effectively improving the temperature rise during water outages. Simultaneously, because the heat-reflecting layer 4 reflects heat into the inner cavity, it prevents heat loss outward, improving heat utilization efficiency.

[0055] The heat reflective layer 4 is provided on at least two of the burner frame 31, the combustion chamber shell 1, and the heat exchanger frame 21. It can be understood that the heat reflective layer 4 can be provided on the inner wall surface of the burner frame 31 and the inner wall surface of the combustion chamber shell 1; or the heat reflective layer 4 can be provided on the inner wall surface of the burner frame 31 and the inner wall surface of the heat exchanger frame 21; or the heat reflective layer 4 can be provided on the inner wall surface of the burner frame 31, the inner wall surface of the combustion chamber shell 1, and the inner wall surface of the heat exchanger frame 21; or the heat reflective layer 4 can be provided on the inner wall surface of the burner frame 31, the inner wall surface of the combustion chamber shell 1, and the inner wall surface of the heat exchanger frame 21.

[0056] In practical applications, the specific structure of the heat-reflective layer 4 can be determined according to the actual situation. For example, it can be a plate structure, film structure, sheet structure, coating structure, or some other type of structure. The specific material of the heat-reflective layer 4 can also be determined according to the actual situation. For example, it can be a high-temperature resistant coating, heat-reflective glass, heat-reflective metal material, etc.

[0057] In summary, in the gas water heater of this utility model, by providing a heat-reflecting layer 4 in at least two of the burner frame 31, combustion chamber shell 1, and heat exchanger frame 21, the heat-reflecting layer 4 can reflect heat towards the inner cavity, thereby reducing the heat transferred outward to the burner frame 31, combustion chamber shell 1, and heat exchanger frame 21. This prevents the wall temperatures of the burner frame 31, combustion chamber shell 1, and heat exchanger frame 21 from becoming too high, effectively improving the temperature rise during water outages. Simultaneously, the heat-reflecting layer 4 can reflect the heat radiated onto it back into the combustion chamber for reuse, preventing heat loss and improving heat utilization efficiency.

[0058] To further improve heat utilization, such as Figure 1 The inner wall of the combustion chamber, the inner wall of the heat exchanger frame 21, and the inner wall of the burner frame 31 are all provided with a heat reflective layer 4.

[0059] In this embodiment, by providing heat reflective layers 4 on the inner walls of the burner frame 31, combustion chamber, and heat exchanger frame 21 along the airflow path, the coverage area of ​​the heat reflective layers 4 is increased, thereby increasing the area for heat reflection. This reduces the path of heat transfer to the outside, improves the heat reflection effect, and further improves the heat utilization rate.

[0060] In one embodiment of this application, as Figure 1 , Figures 3 to 8 The heat exchanger frame 21 includes two opposing mounting plates 211 and two opposing end plates 212. The two opposing mounting plates 211 are integrally connected to opposite sides of the combustion chamber shell 1. The two opposing end plates 212 are respectively installed between the two mounting plates 211, and the heat exchange body 22 is installed between the two end plates 212. The two mounting plates 211 are respectively located on both sides of the heat exchange body 22. A heat reflective layer 4 is provided on the mounting plates 211 and / or end plates 212.

[0061] Two opposing mounting plates 211 are integrally connected to the opposite sides of the combustion chamber housing 1. It can be understood that the opposite side walls of the combustion chamber housing 1 extend upward from the combustion chamber to form two mounting plates 211. Specifically, the combustion chamber housing 1 includes a bottom frame 11 and a cover plate 12. The bottom frame 11 includes a back plate 111 and two side plates 112 connecting the two sides of the back plate 111. The back plate 111 and the two side plates 112 enclose each other to form a structure with openings at the top and bottom and an open opening on one side. The back plate 111 extends upward to form a mounting plate 211. The cover plate 12 is placed on the open opening at the front of the bottom frame 11 and connected to the two side plates 112 to enclose the combustion chamber with the bottom frame 11. The cover plate 12 extends upward to form another mounting plate 211. Two mounting plates 211 form two oppositely distributed mounting ports. Two end plates 212 are respectively installed at the two mounting ports and connected to the two mounting plates 211 and the combustion chamber shell 1 to form a cavity. The heat exchange body 22 (fin assembly 221 and heat exchange tube 222) is located inside the cavity. The two mounting plates 211 are respectively located on opposite sides of the fin assembly 221.

[0062] The mounting plate 211 and / or end plate 212 are provided with a heat-reflecting layer 4. It can be understood that only the mounting plate 211 is provided with a heat-reflecting layer 4, or only the end plate 212 is provided with a heat-reflecting layer 4, or both the mounting plate 211 and the end plate 212 are provided with a heat-reflecting layer 4. With this configuration, the heat at the heat exchanger 2 can be reflected to the heat exchange body 22 through the heat-reflecting layer 4 for heat exchange and utilization, preventing heat loss and ensuring heat utilization efficiency.

[0063] In one embodiment of this application, as Figures 1 to 2 The burner frame 31 includes an outer frame 311 and a fire baffle 312. The outer frame 311 is connected to the combustion chamber shell 1, and the burner body 32 is located inside the outer frame 311. The fire baffle 312 is located on the inner wall of the outer frame 311 and above the burner body 32. A heat reflective layer 4 is provided on the fire baffle 312.

[0064] The outer frame 311 serves as the housing of the burner 3. The outer frame 311 is connected and assembled with the combustion chamber housing 1 to achieve the installation of the burner 3 and the combustion chamber housing 1. Optionally, the outer frame 311 is screwed or riveted to the combustion chamber housing 1. The cross-sectional shape of the outer frame 311 is approximately "U"-shaped. The burner body 32 is installed inside the outer frame 311. Optionally, the burner body 32 is a flame array structure, and the flame outlet of the burner body 32 is located above the burner body 32 to communicate with the combustion chamber. The baffle plate 312 is installed on the inner wall of the outer frame 311, serving to stabilize and guide the flame. It is understood that the baffle plate 312 will be in contact with the flame. In this embodiment, a heat-reflecting layer 4 is provided on the baffle plate 312 to reflect heat towards the combustion area, preventing heat loss through the baffle plate 312 and improving heat utilization.

[0065] In one embodiment of this application, the thermal reflectivity of the heat reflective layer 4 is not less than 0.7.

[0066] As is understood, thermal reflectivity refers to the ratio of the energy reflected from the surface of a heat beam projected onto an object to the total energy projected onto the object. In this embodiment, by selecting a thermal reflective layer 4 with a thermal reflectivity of not less than 0.7, the reflective effect of the thermal reflective layer 4 on heat is ensured, effectively reducing heat transfer to the inner wall surfaces of the combustion chamber, the heat exchanger frame 21, and the burner frame 31, thus preventing heat loss. Optionally, the thermal reflectivity of the thermal reflective layer 4 can be 0.7, 0.75, 0.78, 0.8, 0.83, 0.85, 0.87, 0.9, 0.95, or 1, etc.

[0067] In one embodiment of this application, the heat reflective layer 4 has a temperature tolerance of not less than 800°C.

[0068] Since the heat reflective layer 4 is disposed on the inner wall of the combustion chamber, the inner wall of the heat exchanger frame 21, and the burner frame 31, that is, the heat reflective layer 4 is located on the side close to the flame, the heat reflective layer 4 in this embodiment can withstand a temperature of not less than 800℃, which can ensure the reliability of the heat reflective layer 4.

[0069] In practical applications, the specific structure of the heat reflective layer 4 can be determined according to the actual situation:

[0070] In one embodiment, such as Figure 9 The heat reflective layer 4 is a coating structure. In this embodiment, the heat reflective layer 4 can be formed by spraying high-temperature resistant coating onto the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame 21, and the inner wall surface of the burner frame 31. After drying and hardening, the heat reflective layer 4 is formed.

[0071] Specifically, the heat-reflective layer 4 includes a primer layer 41 and a topcoat layer 42. The primer layer 41 is coated on the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame 21, and the inner wall surface of the burner frame 31. The topcoat layer 42 is coated on the surface of the primer layer 41 and is used to reflect heat. The topcoat layer 42 serves to reflect heat, reducing heat transfer to the combustion chamber shell 1, the heat exchanger frame 21, and the burner frame 31. The primer layer 41 provides a good adhesion surface for the topcoat layer 42, while enhancing the durability of the coating and protecting the base layer, and increasing the bonding strength between the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame 21, and the inner wall surface of the burner frame 31 and the topcoat layer 42.

[0072] Optionally, the primer layer 41 can be an acrylic emulsion primer, alkyd resin primer, epoxy resin primer, fluoropolymer primer, or some other type of coating.

[0073] Optionally, the topcoat layer 42 can be a flat-coat heat-reflective coating, an elastic heat-reflective coating, a real stone heat-reflective coating, or some other types of coatings.

[0074] Furthermore, the thickness h1 of the topcoat layer 42 satisfies: 10μm≤h1≤500μm; the thickness h2 of the primer layer 41 satisfies: 10μm≤h2≤600μm.

[0075] Understandably, the thickness of the heat-reflective layer 4 should not be too large or too small. If it is too large, the heat-reflective layer 4 will be too thick, which may lead to excessive heat storage; if it is too small, the heat-reflective layer 4 will be too thin, which may not provide good protection. Based on this, in this embodiment, the thickness h1 of the topcoat layer 42 of the heat-reflective layer 4 is limited to 10μm≤h1≤500μm, and the thickness h2 of the primer layer 41 is limited to 10μm≤h2≤600μm, ensuring good reflection while reducing heat storage. Optionally, the thickness of the topcoat layer 42 can be 10μm, 50μm, 100μm, 120μm, 150μm, 180μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, or 500μm, etc. Optionally, the thickness of the primer layer 41 can be 10μm, 50μm, 100μm, 120μm, 150μm, 180μm, 200μm, 250μm, 300μm, 350μm, 400μm, 450μm, 500μm, 550μm or 600μm, etc.

[0076] In one embodiment, the heat reflective layer 4 is a plate-like structure or a film structure. Optionally, the plate-like heat reflective layer 4 can be disposed on the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame 21, and the inner wall surface of the burner frame 31. Optionally, the plate-like heat reflective layer 4 can be heat reflective glass, a nanocomposite reflective panel, a ceramic fiber panel, or some other type of reflective panel structure.

[0077] In one embodiment of this application, as Figure 1 The gas water heater also includes a fan 5, which is located above the heat exchanger 2; or, the fan 5 is located below the burner 3.

[0078] Understandably, this gas water heater can be a forced-draft type, in which the fan 5 is located above the heat exchanger 2 and drives the airflow through negative pressure suction; or it can be a blower type, in which the fan 5 is located below the burner 3 and drives the airflow through blowing air.

[0079] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A gas water heater, characterized in that, include: A combustion chamber shell, in which a combustion chamber is formed; A heat exchanger is located above the combustion chamber; the heat exchanger includes a heat exchanger frame and a heat exchange body disposed within the heat exchanger frame, and the heat exchanger frame is connected to the combustion chamber shell; as well as A burner is located below the combustion chamber. The burner includes a burner frame and a burner body disposed within the burner frame. The burner frame is connected to the combustion chamber shell. At least two of the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame, and the inner wall surface of the burner frame are provided with a heat reflective layer.

2. The gas water heater as described in claim 1, characterized in that, The heat reflective layer is provided on the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame, and the inner wall surface of the burner frame.

3. The gas water heater as described in claim 2, characterized in that, The heat-reflective layer is a coating structure.

4. The gas water heater as described in claim 3, characterized in that, The heat reflective layer includes a primer layer and a topcoat layer. The primer layer is coated on the surface of at least two of the inner wall surface of the combustion chamber, the inner wall surface of the heat exchanger frame, and the inner wall surface of the burner frame. The topcoat layer is coated on the surface of the primer layer and is used to reflect heat.

5. The gas water heater as described in claim 4, characterized in that, The thickness h1 of the topcoat layer satisfies: 10μm≤h1≤500μm; the thickness h2 of the primer layer satisfies: 10μm≤h2≤600μm.

6. The gas water heater as described in claim 2, characterized in that, The heat-reflective layer has a plate-like structure or a membrane structure.

7. The gas water heater as described in any one of claims 1 to 6, characterized in that, The thermal reflectivity of the heat reflective layer is not less than 0.7; And / or, the heat reflective layer has a temperature tolerance of not less than 800°C.

8. The gas water heater as described in any one of claims 1 to 6, characterized in that, The heat exchanger frame includes: Two opposing mounting plates are integrally connected to opposite sides of the combustion chamber housing, respectively; Two opposing end plates are respectively installed between the two mounting plates, the heat exchange body is installed between the two end plates, and the two mounting plates are respectively located on both sides of the heat exchange body; The heat-reflective layer is provided on the mounting plate and / or the end plate.

9. The gas water heater as described in any one of claims 1 to 6, characterized in that, The burner frame includes: The outer frame is connected to the combustion chamber housing, and the burner body is located within the outer frame; and A fire baffle is provided on the inner wall of the outer frame and located above the burner body; The heat-reflective layer is provided on the fire shield.

10. The gas water heater as described in any one of claims 1 to 6, characterized in that, It also includes a fan, which is located above the heat exchanger; Alternatively, the fan may be located below the burner.

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