Integrated stainless steel heat exchanger and gas water heater

Abstract

Disclosed in the present invention is an integrated stainless steel heat exchanger, characterized by comprising a left flange plate, a right flange plate, a main heat exchanger and a condensation heat exchanger, wherein a baffle is provided between the main heat exchanger and the condensation heat exchanger; the condensation heat exchanger and the main heat exchanger are arranged in an up-down layout, with the condensation heat exchanger being located above the main heat exchanger; and the main heat exchanger, the condensation heat exchanger and the baffle are connected between the left flange plate and the right flange plate. The present invention enables the structure to be simplified and assembly parts to be reduced, thereby reducing the size of a heat exchange system, facilitating production and processing.

Description

An integrated stainless steel heat exchanger and gas water heater Technical Field

[0001] The present invention relates to the technical field of gas water heaters, and more particularly to an integrated stainless steel heat exchanger and a gas water heater. Background Art

[0002] In the context of dual-carbon energy conservation, condensing gas water heaters are becoming more and more popular. The condensing heat exchanger and the main heat exchanger of the existing condensing gas water heater are two parts, which are not only complex in structure and take up space, but also inconvenient to install. For example, the Chinese patent authorization announcement number CN206637834U discloses a gas water heater with a flue gas circulation system, including: a combustion chamber, a strong blower DC fan connected to the combustion chamber, a primary heat exchanger, a secondary heat exchanger, and a main controller connected to the strong blower DC fan; the cold water flowing out of the water inlet pipe of the gas water heater first enters the secondary heat exchanger for heat exchange, and the water flowing out of the secondary heat exchanger then enters the primary heat exchanger for heating; it is characterized in that a flue gas circulation channel connecting the secondary heat exchanger and the combustion chamber is provided outside the combustion chamber, and an electric control gas valve for controlling the opening of the channel is provided on the flue gas circulation channel, and the electric control gas valve is connected to the main controller. During actual operation, a portion of the flue gas, which has been heated and cooled, is brought into the combustion chamber through the flue gas circulation channel and the electrically controlled gas valve, reducing the combustion chamber temperature and the oxygen concentration in the diluted mixture. This not only improves the efficiency of hot water production but also reduces nitrogen oxide emissions. However, the following drawbacks apply: First, the condensing heat exchanger uses a single, curved bellows to form the waterway, with the shell assembled externally. First, the bellows is suspended in the air. When the water pressure fluctuates significantly, the bellows shake and collide with the shell, generating noise. Second, after the shell is riveted together, a sealant must be applied to prevent the escape of flue gas and condensed water, making the process complex. Second, the condensing heat exchanger is connected to the main heat exchanger through a smoke hood, which requires a rubber ring to seal the joint, resulting in poor reliability. Furthermore, the condensing heat exchanger is connected in series with the main heat exchanger waterway via a joint, which poses a high risk of leakage. Third, the condensing heat exchanger and the main heat exchanger are arranged in a left-right layout, which takes up a lot of space. Fourth, the left-right layout of the condensing heat exchanger and the main heat exchanger results in high flue gas resistance. Therefore, further improvements to the existing technology are necessary. Technical issues

[0003] The purpose of the present invention is to provide an integrated stainless steel heat exchanger to address the deficiencies of the prior art, thereby improving the efficiency of condensation heat exchange and ensuring its reliability. The integrated component structure can be simplified, the number of assembly parts can be reduced, the volume of the heat exchange system can be reduced, and production and processing can be facilitated.

[0004] Another object of the present invention is to provide a gas water heater. Technical Solutions

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned purpose: an integrated stainless steel heat exchanger, characterized in that it includes a left flange plate, a right flange plate, a main heat exchanger and a condensing heat exchanger, a baffle is provided between the main heat exchanger and the condensing heat exchanger, the condensing heat exchanger and the main heat exchanger are arranged in an upper and lower manner, the condensing heat exchanger is located above the main heat exchanger, and the main heat exchanger, the condensing heat exchanger and the baffle are respectively connected between the left flange plate and the right flange plate.

[0006] As a further illustration of the above scheme, the main heat exchanger includes multiple primary heat exchange tubes and multiple heat collecting plates; the condensing heat exchanger includes multiple secondary heat exchange tubes, and the primary heat exchange tubes and the secondary heat exchange tubes are connected in series through flange plates.

[0007] Furthermore, multiple secondary heat exchange tubes are arranged in groups, and each condensation water tank is correspondingly provided with a group of secondary heat exchange tubes; multiple secondary heat exchange tubes are arranged in parallel and then connected in series with the primary heat exchange tubes.

[0008] Furthermore, a plurality of heat collecting plates are arranged in parallel with each other and have heat exchange gaps between them; the heat collecting plates are provided with jacks corresponding to the first-level heat exchange tubes.

[0009] Furthermore, the baffle is fixed to the flange plate by welding, the baffle is provided with a condensate water tank, and the flange plate is provided with a condensate water drain port, which is connected to the condensate water tank. The condensate generated after the secondary heat exchange flows through the condensate water tank to the condensate water drain port and flows out of the heat exchanger.

[0010] Furthermore, the condensation water trough of the baffle has a certain inclination angle in the direction of the condensation water outlet, which facilitates the discharge of condensation.

[0011] Furthermore, flanges are provided at both ends of the baffle, and the flanges are welded and fixed to the flange plates.

[0012] Furthermore, multiple secondary heat exchange tubes are arranged in the condensation water tank, and a flue gas channel is provided on the side of the condensation water tank. After passing through the main heat exchanger, the high-temperature flue gas enters from the flue gas channel and exchanges heat with the secondary heat exchange tubes, reducing the flue gas resistance and eliminating the connection joints.

[0013] A gas water heater is characterized in that it comprises a water heater body, in which an integrated stainless steel heat exchanger is arranged. Beneficial effects

[0014] The beneficial effects that can be achieved by the present invention using the above technical solutions are:

[0015] 1. The present invention adopts a heat exchanger structure mainly composed of a left flange plate, a right flange plate, a main heat exchanger, and a condensing heat exchanger. A baffle is provided between the main heat exchanger and the condensing heat exchanger. The condensing heat exchanger and the main heat exchanger are arranged in an up-down manner, with the condensing heat exchanger located above the main heat exchanger. The main heat exchanger, the condensing heat exchanger, and the baffle are respectively connected between the left flange plate and the right flange plate. This realizes the integrated design of the primary and secondary heat exchangers, simplifies the production of parts and the assembly of the whole machine, reduces the smoke resistance, and eliminates the connection joints.

[0016] 2. The main heat exchanger and condensing heat exchanger of the present invention have simple component structures and smaller volumes, which are beneficial to the overall layout of the machine. The main heat exchanger and condensing heat exchanger are made of all stainless steel, which is more corrosion-resistant.

[0017] 3. The condensing heat exchanger of the present invention replaces the corrugated tube with a round tube and is designed to connect multiple thin tubes in parallel to improve the efficiency of condensing heat exchange.

[0018] 4. The present invention designs a flue gas diversion structure and takes into account the function of a condensate drainage channel; the structure of the integrated components can be simplified, the number of assembly parts can be reduced, the volume of the heat exchange system can be reduced, and production and processing can be facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic structural diagram of the present invention;

[0020] FIG2 is a schematic structural diagram of the present invention;

[0021] FIG3 is a schematic diagram of the installation structure of the primary heat exchange tube and the secondary heat exchange tube;

[0022] FIG4 is a schematic diagram of the installation structure of the primary heat exchange tube and the secondary heat exchange tube;

[0023] Figure 5 is a schematic diagram of the high-temperature flue gas flow direction.

[0024] Explanation of the accompanying symbols: 1, left flange plate 2, right flange plate 3, main heat exchanger 3-1, primary heat exchange tube 3-2, heat collecting plate 4, condensing heat exchanger 4-1, secondary heat exchange tube 5, baffle 5-1, condensate tank 5-2, flange 5-3, flue gas channel 6, left side plate 7, right side plate 8, water inlet pipe interface 9, water outlet pipe interface 10, condensate drain outlet. Best Mode for Carrying Out the Invention

[0025] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly include one or more of these features. Throughout the description of the present invention, "at least" means one or more than one, unless otherwise specifically defined.

[0027] In the present invention, unless otherwise specified or limited, the terms "assemble," "connect," and "connect" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection; direct connection, connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] In the present invention, unless otherwise specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature therebetween. Furthermore, a first feature being "above," "below," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "above," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature. Modes for Carrying Out the Invention

[0029] The following description of the embodiments of the present invention is further described in conjunction with the accompanying drawings to make the technical solutions and beneficial effects of the present invention clearer and more specific. The following description of the embodiments with reference to the accompanying drawings is illustrative and intended to explain the present invention, but is not to be construed as limiting the present invention.

[0030] As shown in Figures 1-4, the present invention relates to an integrated stainless steel heat exchanger and gas water heater. The gas water heater comprises a gas water heater body, a burner mounted therein, and an integrated stainless steel heat exchanger. Since gas water heaters are relatively common, the specific mounting structures of the burner and integrated stainless steel heat exchanger are not described here. The integrated stainless steel heat exchanger comprises a left flange plate 1, a right flange plate 2, a main heat exchanger 3, and a condensing heat exchanger 4. These components are all made of corrosion-resistant stainless steel. The main heat exchanger 3 serves as the primary heat exchange module, while the condensing heat exchanger 4 serves as the secondary heat exchange module. A baffle 5 is positioned between the main heat exchanger 3 and the condensing heat exchanger 4. The condensing heat exchanger 4 and the main heat exchanger 3 are arranged in an up-down configuration, with the condensing heat exchanger 4 positioned above the main heat exchanger 3. The main heat exchanger 3, the condensing heat exchanger 4, and the baffle 5 are connected between the left flange plate 1 and the right flange plate 2, respectively. A left side plate 6 is mounted on the outside of the left flange plate 1 and welded to the left flange plate 1. An outer side plate 7 is mounted on the outside of the right flange plate 2 and welded to the right flange plate 2. The main heat exchanger 3 comprises multiple primary heat exchange tubes 3-1 and multiple heat collecting fins 3-2, which are arranged parallel to each other with heat exchange gaps between them. The heat collecting fins 3-2 are equipped with sockets corresponding to the primary heat exchange tubes 3-1. The condensing heat exchanger 4 comprises multiple secondary heat exchange tubes 4-1. The primary and secondary heat exchange tubes are connected in series via a flange plate. To simplify the connection structure of the heat exchange tubes, corresponding plate cavities are stamped into the flange plate to connect the heat exchange tubes. In this embodiment, a water inlet pipe interface 8 is connected to the right flange plate 2, and a water outlet pipe interface 9 is connected to the left flange plate 1. The water flows from the water inlet pipe interface, flows through the secondary heat exchange pipe of the condensing heat exchanger, and then enters the primary heat exchange pipe of the main heat exchanger, and flows out from the water outlet pipe interface.

[0031] The baffle 5 is welded to the flange plate. It features a condensate trough 5-1, which is connected to a condensate drain outlet 10. The condensate trough on the baffle is tilted at an angle of 5-30 degrees toward the condensate drain to facilitate condensate discharge. The condensate trough 5-1 is wide at the top and narrow at the bottom, with a curved bottom plate at its base to facilitate condensate storage and flow. Flanges 5-2 are welded to the flange plate at each end of the baffle. These flanges serve the following functions: first, they redirect the flue gas flow through the secondary heat exchange module; second, they allow the condensate generated after the secondary heat exchange to flow through the condensate trough to the condensate drain outlet and out of the heat exchanger. Solder paste is applied to the condensate trough for brazing to ensure its tightness.

[0032] Furthermore, multiple secondary heat exchange tubes 4-1 are arranged in the condensation water tank 5-1, and a flue gas channel 5-3 is provided on the side of the condensation water tank 5-1. As shown in Figure 5, the high-temperature flue gas flows through the main heat exchanger and enters from the flue gas channel 5-3 to exchange heat with the secondary heat exchange tubes 4-1, reducing the flue gas resistance and eliminating the connection joints.

[0033] Compared with the existing technology, the present invention adopts an integrated stainless steel primary and secondary heat exchanger, and integrates the design of the primary and secondary heat exchangers to simplify the production of components and the assembly of the whole machine; the integrated stainless steel primary and secondary heat exchanger has a simple component structure and a smaller size, which is conducive to the layout of the whole machine; the integrated stainless steel primary and secondary heat exchanger is made of all stainless steel materials, which is more corrosion-resistant.

[0034] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the creative concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. An integrated stainless steel heat exchanger, Characterized in that, It includes a left flange plate, a right flange plate, a main heat exchanger and a condensation heat exchanger. A baffle is provided between the main heat exchanger and the condensation heat exchanger. The condensation heat exchanger and the main heat exchanger are arranged in an up-and-down layout. The condensation heat exchanger is located above the main heat exchanger. The main heat exchanger, the condensation heat exchanger and the baffle are respectively connected between the left flange plate and the right flange plate.

2. The integrated stainless steel heat exchanger according to claim 1, Characterized in that, The main heat exchanger includes a plurality of first-stage heat exchange tubes and a plurality of heat collecting fins; the condensation heat exchanger includes a plurality of second-stage heat exchange tubes. The first-stage heat exchange tubes and the second-stage heat exchange tubes are connected in series in the water path through the flange plate.

3. The integrated stainless steel heat exchanger according to claim 2, Characterized in that, The plurality of second-stage heat exchange tubes are grouped, and a group of second-stage heat exchange tubes is correspondingly arranged in each condensation water tank; the plurality of second-stage heat exchange tubes are connected in parallel and then connected in series with the first-stage heat exchange tubes.

4. The integrated stainless steel heat exchanger according to claim 2, Characterized in that, The plurality of heat collecting fins are arranged parallel to each other and have a heat exchange gap therebetween; the heat collecting fins are provided with jacks corresponding to the first-stage heat exchange tubes.

5. The integrated stainless steel heat exchanger according to claim 1, Characterized in that, The baffle is fixed to the flange plate by welding. The baffle is provided with a condensation water tank. The flange plate is provided with a condensation water drain port. The condensation water drain port communicates with the condensation water tank. The condensation water generated after the second-stage heat exchange flows out of the heat exchanger through the condensation water tank to the condensation water drain port.

6. The integrated stainless steel heat exchanger according to claim 5, Characterized in that, The condensation water tank of the baffle has a certain inclination angle in the direction of the condensation water port.

7. The integrated stainless steel heat exchanger according to claim 1, Characterized in that, The two ends of the baffle are provided with flanges, and the flanges are welded and fixed to the flange plate.

8. The integrated stainless steel heat exchanger according to claim 2, Characterized in that, The plurality of second-stage heat exchange tubes are arranged in the condensation water tank. A flue gas channel is provided on the side of the condensation water tank. The high-temperature flue gas flows through the main heat exchanger and then enters through the flue gas channel to perform heat exchange with the second-stage heat exchange tubes.

9. A gas water heater, Characterized in that, It includes a water heater main body, and an integrated stainless steel heat exchanger as described in any one of claims 1-8 is provided in the water heater main body.

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