A "basket"-shaped three-dimensional variable space condensing gas water heater

Abstract

The present invention provides a three-dimensional variable space condensing gas water heater whose heat exchange core is shaped like a woven daily necessity "bamboo basket". The heat exchange core is mainly composed of a water heater shell, a "basket"-shaped three-dimensional variable space heat exchange core, a guide tube, a partition layer and a burner, wherein the heat exchange core is composed of a single-layer or multi-layer "basket"-shaped coil, and is connected by a water inlet header and a water outlet header. The "basket"-shaped coil is made of a three-dimensional variable space tube, and the high-temperature flue gas generated by the burner enters the "basket"-shaped three-dimensional variable space heat exchange core and performs efficient heat exchange with the medium in the tube. The use of this three-dimensional variable space variable cross-section "basket"-shaped heat exchange core can effectively improve the heat exchange coefficient of the gas water heater heat exchanger, thereby improving the heat exchange efficiency of the water heater, which is beneficial to reducing the total volume of the water heater, reducing weight, saving materials, and reducing costs. In addition, it is easy to clean dust and scale, and extend the maintenance cycle.

Description

Technical Field

[0001] The invention relates to the technical field of water heaters, and in particular to a "basket"-shaped three-dimensional variable space condensing gas water heater. Background Art

[0002] In the prior art, a common condensing gas water heater is composed of a burner, a coil heat exchange core, a shell and other components. The coil heat exchange core is made of a round base tube pressed into a flat tube, and then wound into a spiral coil. The flat tube coil is arranged horizontally, and the burner is arranged horizontally in the axial direction of the cylinder formed by the coil. When the premixed natural gas enters the burner through the air intake pipe and burns, the high-temperature flue gas generated by the combustion passes through the coil in a radial direction and heats the medium in the tube, and then is collected through the flow channel between the coil and the shell and discharged from the flue gas outlet set at the top.

[0003] This type of water heater has fatal technical problems:

[0004] First, when the high-temperature flue gas and the medium water exchange heat, they are in a cross-flow mode, and the temperature difference of the heat exchange is small, which cannot maximize the driving force of the heat exchange between the high-temperature fluid and the low-temperature fluid. Second, because the flue gas flows along the radial direction of the cylindrical coil, the gap on the side of the cylinder is its flow cross-sectional area. This area is too large for the corresponding flue gas volume, resulting in too slow flue gas flow rate and too low heat exchange efficiency, which cannot meet the technical requirements of the condensing furnace. Third, the flat tube coil uses a fixed distance device to ensure the flat tube spacing of the coil. The distance is too small and the gap is very uneven. In addition, it is a simple one-dimensional channel structure, so that the sulfide organization precipitated after the flue gas is condensed will cause serious blockage of the tube gap channel and fail, causing major technical accidents. Fourth, due to its unreasonable structure, the flue gas flow field is seriously uneven, the deviation is serious, and the lower half of the horizontally arranged coil is almost not involved in the heat exchange, the utilization rate is very low, and the heat exchange effect is seriously affected. Fifth, the coil is made of ordinary flat tubes without any deep strengthening means, and the heat transfer coefficient of the heat exchange element is too low. Summary of the invention

[0005] In response to the above-mentioned technical problems to be solved, the present invention provides a "basket"-shaped three-dimensional variable space condensing gas water heater, which adopts a "basket"-shaped three-dimensional variable space and variable cross-section heat exchange core to improve the flow field on the flue gas side and the water side, and increase the flow field dimension. The flue gas flow channel and the water flow channel present a three-dimensional variable space and variable cross-section flow pattern, which improves the heat transfer coefficient and heat exchange temperature difference of the heat exchange element, and makes the flow field uniform, without flow dead corners, not easy to scale, easy to clean, and increases the maintenance cycle.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A "basket"-shaped three-dimensional variable space condensing gas water heater, comprising a water heater shell and a "basket"-shaped three-dimensional variable space heat exchange core, a guide tube, a partition layer and a burner arranged in the water heater shell;

[0008] The "basket"-shaped three-dimensional variable space heat exchange core is composed of a single-layer or multi-layer "basket"-shaped coil. The "basket"-shaped coil is wound by a three-dimensional variable space tube, and its two ends are respectively connected to the water inlet header and the water outlet header;

[0009] The guide tube is a conical tubular structure, and the partition layer is a truncated cone structure. The partition layer is coaxially arranged in the guide tube to form an annular heat exchange chamber with a decreasing inner diameter along the axial direction. The "basket"-shaped three-dimensional variable space heat exchange core is installed in the annular heat exchange chamber. The end with a larger inner diameter in the annular heat exchange chamber is the air inlet end, and the end with a smaller inner diameter is the exhaust end.

[0010] The burner is arranged close to the air inlet end of the annular heat exchange chamber, and the generated high-temperature flue gas enters the "basket"-shaped three-dimensional variable space heat exchange core to exchange heat with the medium in the tube.

[0011] The gas water heater of the present invention adopts a "basket"-shaped heat exchange core with three-dimensional variable space and variable cross-section. The "basket"-shaped heat exchange core adopts high-efficiency heat exchange special-shaped tubes, which can greatly improve the heat exchange efficiency of the heat exchange core, thereby improving the heat exchange efficiency of the water heater, which is beneficial to reducing the total volume of the water heater, reducing weight, saving materials, and reducing costs.

[0012] The "basket"-shaped heat exchange core of the present invention can simultaneously realize radial and axial variable space structures and homogenize the flue gas flow field.

[0013] The "basket"-shaped heat exchange core of the present invention converts a one-dimensional flow pattern into a three-dimensional flow pattern. Increasing the dimension can eliminate flow dead zones and eddy points, and increase the flow channel size between heat exchange elements, thereby eliminating scaling, facilitating dust and scale cleaning, and extending the maintenance cycle.

[0014] The "basket"-shaped heat exchange core of the present invention can realize the characteristic that the flow cross-sectional area gradually decreases from large to small, satisfying the characteristic that the volume flow rate of flue gas continuously decreases as the temperature continuously decreases, so that the flue gas velocity flow field can be kept consistent as much as possible, reducing the flow energy loss.

[0015] The "basket"-shaped heat exchange core of the present invention is composed of single-layer or multi-layer "basket"-shaped coils, and is connected by a water inlet header and a water outlet header. The number of layers can be flexibly adjusted according to the load size of the water heater.

[0016] The "basket"-shaped heat exchange core of the present invention has guide tubes and partition layers on both sides, which force the flue gas to flow along the busbar of the "basket"-shaped coil, thereby increasing the flow rate of the flue gas and further improving its heat exchange coefficient, and meeting the flow rate requirements for self-cleaning.

[0017] As an improvement of the present invention, the three-dimensional variable space tube is formed by spirally twisting an elliptical tube. The shape of the single coil flow channel on the medium side is approximately twist-shaped, and the cross section is nearly elliptical. The water medium flow forms a spiral fluid, and the secondary flow swirl is generated to destroy the thermal boundary layer and strengthen the heat exchange. Not only the heat transfer coefficient is enhanced, but also the flow rate is increased to meet the self-scaling requirements of the medium side.

[0018] As an improvement of the present invention, the end with a smaller inner diameter of the "basket"-shaped three-dimensional variable space heat exchange core is the water inlet end, and the end with a larger inner diameter is the water outlet end, and the medium inside and outside the tube performs full countercurrent heat exchange. The flow direction of the flue gas between the "basket"-shaped coils is opposite to the flow direction of the medium in the "basket"-shaped coils, which almost meets the characteristics of the full countercurrent structure, increases the temperature difference of the heat exchange, reduces the heat exchange area, and achieves material reduction.

[0019] As an improvement of the present invention, the multi-layer "basket"-shaped coil is arranged in series or staggered. The coil can be flexibly arranged in series or staggered according to the physical characteristics of the flue gas generated after the combustion of the gas, meeting the gas characteristics of different regions, making the primary and secondary contradictions flexibly transformed, and reducing the manufacturing cost and material consumption.

[0020] As an improvement of the present invention, the end with a larger inner diameter of the "basket"-shaped three-dimensional variable space heat exchange core is also connected to a radiation coil, and the burner is installed on the central axis of the radiation coil. The radiation coil is arranged at the front end of the "basket"-shaped heat exchange core to completely wrap the burner, which not only makes full use of the space to arrange the heat exchange area to meet the heat exchange needs, but also can use the water channel to block the influence of high-temperature flue gas on the outer temperature of the shell, reduce heat loss, and improve safety.

[0021] As an improvement of the present invention, the end of the partition layer close to the burner is a concave arc surface, which can optimize the flue gas flow field and make the high-temperature flue gas generated by the burner smoothly enter the "basket"-shaped heat exchange core.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention adopts a three-dimensional variable space and variable cross-section coil to improve the heat exchange efficiency of the heat exchange module, optimize the flow field on the flue gas and water sides, reduce local dead angles, make the flow fields on both sides more uniform, less prone to scaling, extend the maintenance cycle of the heat exchanger, and reduce the difficulty of maintenance. In addition, the running resistance of the fluid on both sides is reduced, the operating power of the pump and blower is reduced, the operating cost is reduced, and the operating cost is reduced, so as to achieve the purpose of energy saving and emission reduction. Furthermore, the heat exchange efficiency is improved, the heat exchange area can be reduced, the consumables and volume of the heat exchanger can be reduced, and the manufacturing and transportation costs can be reduced. Finally, the space occupied by the water heater is reduced, and the flexibility and adaptability of the installation are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a schematic diagram of the structure of the present invention.

[0025] Figure 2 for Figure 1 Schematic diagram of the AA cross section.

[0026] Figure 3 for Figure 1 3D schematic diagram of one of the structural types of component 2 (single-layer "basket-shaped coil").

[0027] Figure 4 for Figure 1 3D schematic diagram of one of the structural types of component 2 (3 layers of "basket-shaped coils").

[0028] Explanation of the reference numerals: 1-radiation coil; 2-basket-shaped three-dimensional variable space heat exchange core; 3-guide tube; 4-smoke outlet flange; 5-smoke box; 6-arc-shaped partition layer; 7-gas inlet; 8-burner; 9-water inlet header; 10-water outlet header. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 and Figure 2 As shown, a "basket"-shaped three-dimensional variable space condensing gas water heater includes a water heater shell and a radiation coil 1 arranged in the water heater shell, a "basket"-shaped three-dimensional variable space heat exchange core 2, a guide tube 3, a smoke box 5, an arc-shaped partition layer 6 and a burner 8.

[0031] The "basket"-shaped three-dimensional variable space heat exchange core 2 looks like a woven daily-use "bamboo basket" and is arranged horizontally in the middle of the water heater shell. In this embodiment, the "basket"-shaped three-dimensional variable space heat exchange core 2 is formed by three layers of "basket"-shaped coils arranged in sequence. The "basket"-shaped coil is wound by a three-dimensional variable space tube, and the three-dimensional variable space tube is formed by spirally twisting an elliptical tube to form a three-dimensional variable space variable cross-section coil, such as Figure 3 or Figure 4 The end of the "basket"-shaped three-dimensional variable space heat exchange core 2 with a smaller inner diameter is the water inlet end, which is connected to the water inlet header 9, and the end with a larger inner diameter is the water outlet end, which is connected to the water outlet header 10.

[0032] The guide tube 3 is a conical tubular structure, and the arc-shaped partition layer 6 is a truncated cone structure. The arc-shaped partition layer 6 is coaxially arranged in the guide tube 3 to form an annular heat exchange chamber whose inner diameter gradually decreases along the axial direction. The "basket"-shaped three-dimensional variable space heat exchange core 2 is installed in the annular heat exchange chamber. The end of the annular heat exchange chamber with a larger inner diameter is the air inlet end, and the end with a smaller inner diameter is the exhaust end.

[0033] The radiation coil 1 is arranged at the front end of the water heater shell and connected to the end with a larger inner diameter of the "basket"-shaped three-dimensional variable space heat exchange core 2. The burner 8 is installed at the central axis of the radiation coil 1, with the front end connected to the gas inlet 7 and the rear end extending to the arc surface of the arc partition layer 6.

[0034] The smoke box 5 is arranged at the front end of the water heater shell and is connected with the exhaust end of the annular heat exchange chamber. The top surface of the smoke box 5 is provided with a smoke outlet flange 4.

[0035] When in use, natural gas first enters the burner 8 located at the central axis of the "basket"-shaped three-dimensional variable space heat exchange core 2 through the gas inlet 7 for combustion. The generated flue gas flows along the busbars of the radiation coil 1 and the "basket"-shaped three-dimensional variable space heat exchange core 2 under the action of the arc partition layer 6 and the guide tube 3, and exchanges heat with the radiation coil 1 in the form of radiation heat transfer and with the "basket"-shaped coil in the form of horizontal flushing convection heat transfer. The flue gas fully absorbs its condensation heat, and the generated condensed water is discharged from the condensed water drain port. The dry flue gas enters the smoke box 5 and is discharged through the flue gas outlet flange 4 at the top. In this process, as the temperature of the flue gas decreases, the flow cross-sectional area of ​​the "basket"-shaped three-dimensional variable space heat exchange core 2 also decreases accordingly, ensuring that the flue gas flow rate is within a reasonable range without too much fluctuation, reducing the flow energy loss. At the same time, the three-dimensional flow state of the flue gas eliminates dead zones and vortices, prevents the precipitation of dirt to form scaling, and achieves the purpose of self-scaling.

[0036] On the water side, the softened water is evenly distributed to the inside of the multi-layered parallel "basket"-shaped three-dimensional variable space heat exchange core 2 through the water inlet manifold 9, and respectively exchanges heat with the flue gas in a countercurrent flow along the "basket"-shaped coil and the radiation coil spiral line. After the heat exchange is completed, it is collected through the water outlet manifold 10 and sent to the user. In this process, the water medium flow in the tube is formed into a spiral fluid by strengthening means, and the secondary flow swirl is generated to destroy the thermal boundary layer and strengthen the heat exchange. Not only the heat exchange coefficient is strengthened, but also the flow rate is increased to meet the self-scaling requirements of the medium side.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. A "basket"-shaped three-dimensional variable space condensing gas water heater, characterized in that: It includes a water heater shell and a "basket"-shaped three-dimensional variable space heat exchange core, a guide tube, a partition layer and a burner arranged in the water heater shell; The "basket"-shaped three-dimensional variable space heat exchange core is composed of a single-layer or multi-layer "basket"-shaped coil, which is wound by a three-dimensional variable space tube, and its two ends are respectively connected to the water inlet header and the water outlet header; The guide tube is a conical tubular structure, and the partition layer is a truncated cone structure. The partition layer is coaxially arranged in the guide tube to form an annular heat exchange chamber with a decreasing inner diameter along the axial direction. The "basket"-shaped three-dimensional variable space heat exchange core is installed in the annular heat exchange chamber. The end with a larger inner diameter in the annular heat exchange chamber is the air inlet end, and the end with a smaller inner diameter is the exhaust end. The burner is arranged close to the air inlet end of the annular heat exchange chamber, and the generated high-temperature flue gas enters the "basket"-shaped three-dimensional variable space heat exchange core to exchange heat with the medium in the tube. In this process, as the temperature of the flue gas decreases, the flow cross-sectional area of ​​the "basket"-shaped three-dimensional variable space heat exchange core also decreases accordingly, ensuring that the flue gas flow rate is within a reasonable range without too much fluctuation, reducing flow energy loss; The three-dimensional variable space tube is formed by spirally twisting an elliptical tube; The end of the partition layer close to the burner is in the form of an inwardly concave arc surface.

2. A "basket"-shaped three-dimensional variable space condensing gas water heater according to claim 1, characterized in that: The end with a smaller inner diameter of the "basket"-shaped three-dimensional variable space heat exchange core is the water inlet end, and the end with a larger inner diameter is the water outlet end, and the media inside and outside the tube perform full countercurrent heat exchange.

3. The "basket"-shaped three-dimensional variable space condensing gas water heater according to claim 1, characterized in that: The multi-layer "basket"-shaped coils are arranged in series or staggered.

4. The "basket"-shaped three-dimensional variable space condensing gas water heater according to claim 1, characterized in that: The end with a larger inner diameter of the "basket"-shaped three-dimensional variable space heat exchange core is also connected to a radiation coil, and the burner is installed on the central axis of the radiation coil.

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