Heat exchanger and gas heating water heater

Abstract

The heat exchanger comprises a fin set, a heat exchange tube set, a fixing plate and a connecting pipe, the fin set is composed of a plurality of fins, the heat exchange tube set is composed of a plurality of cylindrical heat exchange tubes, the fins are arranged on the heat exchange tube set at intervals in a sleeved mode in the length direction of the heat exchange tubes, and the fixing plate is arranged on the connecting pipe. The connecting pipe comprises a connecting elbow, a water return connector and a water outlet connector, and the connecting elbow, the water return connector and the water outlet connector are respectively connected with the heat exchange pipe set to form a water flow channel. According to the heat exchanger, the round heat exchange pipes are connected with the connecting pipes, the machining technology of the oval pipes is optimized, the risk of missing welding is reduced, the reject ratio of products is reduced, meanwhile, due to the fact that the machining technology of the round pipes is simple, the sealing performance of the round pipes is better, assembling is easier, the machining cost can be effectively reduced, and the delivery period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a heat exchanger and a gas heating hot water boiler. Background Art

[0002] Gas heating water heater uses natural gas as fuel, and produces high-temperature flue gas after combustion in the burner. The high-temperature flue gas then flows through the heat exchanger for heat exchange, and the heat energy of the high-temperature flue gas is transferred to the low-temperature system circulating water through the heat exchanger. Then the fan discharges the low-temperature flue gas after heat exchange to the outside. The system circulating water circulates through the circulation pump to take away the heat absorbed by the heat exchanger in time. Among them, there are many fins in the heat exchanger, the purpose of which is to increase the heat exchange area between the high-temperature flue gas and the main heat exchanger, increase the heat exchange efficiency, and transfer the heat to the system water in the pipeline. The heat exchange process is mainly convection heat exchange and radiation heat exchange.

[0003] The main material used for existing heat exchangers is copper, and stainless steel heat exchangers are also used. However, the existing single-channel heat exchangers are generally single-tube elliptical tubes, and the heat exchange structure is formed by U-shaped tubes in series. Due to the complex process and high processing cost of this type of structure, and the high dimensional accuracy requirements for the U-shaped tube interface of the elliptical tube, the requirements for the tube expansion process are also high. At the same time, the elliptical tube has more interfaces that need to be welded, resulting in a high risk of welding leaks at the interfaces, resulting in a high defect rate of heat exchanger products. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a heat exchanger to solve the above-mentioned traditional problems.

[0005] The second purpose of the utility model is to provide a gas heating water heater using the heat exchanger.

[0006] One of the purposes of the utility model is achieved by the following technical solution:

[0007] A heat exchanger comprises a fin group, a heat exchange tube group and a fixing plate sleeved in the fin group, and a connecting pipe sleeved in the heat exchange tube group, wherein the fin group is composed of a plurality of fins, and the heat exchange tube group is composed of a plurality of cylindrical heat exchange tubes, each of the fins is sleeved on the heat exchange tube group at intervals along the length direction of the heat exchange tube and separates each of the heat exchange tubes, and the connecting pipe comprises a connecting elbow, a return water joint and a water outlet joint, and the connecting elbow, the return water joint and the water outlet joint are respectively connected to the heat exchange tube group to form a water flow channel.

[0008] Preferably, two opposite ends of the heat exchange tube are provided with ring-shaped inner abutment blocks, and the inner abutment blocks abut against the connecting tube.

[0009] Preferably, the heat exchange tube and the connecting pipe are installed by interference fit.

[0010] Preferably, the fin is provided with a plurality of circular flange holes, a spoiler block group arranged between the flange holes, a first blocking block arranged above the spoiler block group, and a second blocking block arranged above the side of the spoiler block group, the flange holes are used to sleeve the heat exchange tubes, the spoiler block group consists of a first spoiler block and a plurality of second spoiler blocks, and the second spoiler blocks are arranged at opposite ends of the first spoiler block.

[0011] Preferably, a welding rod hole is provided on the flanging hole, and the welding rod hole is located above the flanging hole.

[0012] Preferably, the length of the first spoiler block is greater than that of the second spoiler block, and both the first spoiler block and the second spoiler block are arch structures formed by stamping.

[0013] Preferably, the first blocking block is in a downwardly concave arc-shaped structure, and the second blocking block is in an inclined bar shape.

[0014] Preferably, the width of the first blocking block protrusion is equal to the width of the second blocking block protrusion, the width of the first blocking block protrusion is greater than the width of the flange hole protrusion, and the width of the flange hole protrusion is greater than the width of the spoiler block group protrusion.

[0015] Preferably, a matching protrusion is provided on the fixing plate, and the matching protrusion is in a circular ring shape.

[0016] The second purpose of the utility model is achieved by the following technical solution:

[0017] A gas heating water heater comprises the heat exchanger described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The heat exchanger of the utility model adopts a circular heat exchange tube connected to the connecting tube, optimizes the processing technology of the elliptical tube, reduces the risk of welding leakage, and reduces the defective rate of the product. At the same time, due to the simple processing technology of the round tube, the sealing performance is better and the assembly is simpler, which can effectively reduce the processing cost and shorten the delivery cycle.

[0020] 2. The heat exchanger of the utility model forms a second internal seal by abutting the inner abutment block of the heat exchange tube with the connecting pipe, and adopts an interference fit method to puncture a small number of bubbles formed on the wall of the heat exchange tube, thereby reducing the generation of bubbles and reducing the noise in the heat exchanger.

[0021] 3. The heat exchanger of the utility model optimizes the fin structure and matches the structures such as the turbulence block group and the blocking block with the circular heat exchange tube, thereby increasing the turbulence effect between the fins while ensuring the performance and service life, so as to improve the heat exchange efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the heat exchanger of the utility model;

[0023] Figure 2 for Figure 1 A bottom view of the heat exchanger is shown;

[0024] Figure 3 for Figure 1 An exploded view of the heat exchanger shown;

[0025] Figure 4 for Figure 3 The connection structure diagram of the heat exchange tube and the connecting pipe shown;

[0026] Figure 5 for Figure 4 An enlarged view of point A is shown;

[0027] Figure 6 for Figure 1 A cross-sectional view of the heat exchanger shown;

[0028] Figure 7 for Figure 6 Schematic diagram of the structure of the fin shown.

[0029] In the figure: 10, fin group; 11, flange hole; 12, spoiler block group; 120, first spoiler block; 121, second spoiler block; 13, first blocking block; 14, second blocking block; 15, welding rod hole; 20, heat exchange tube group; 21, inner abutment block; 30, fixing plate; 31, matching protrusion; 40, connecting pipe. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the description of the present utility model, it is necessary to understand that when an element is considered to be "connected" to another element, it may be directly connected to another element or there may be intermediate elements at the same time. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0033] See also Figure 1-Figure 7 , which is a heat exchanger of a preferred embodiment of the utility model, is used to be installed in a gas heating water heater. The gas heating water heater also includes a fan, a burner, a water outlet valve, a gas proportional valve, a circulating water pump, a heating water outlet pipe, a heating water return pipe, a heating water outlet interface, a heating water return interface and a gas interface. The two ends of the heat exchanger are respectively connected to the heating water outlet pipe and the heating water return pipe.

[0034] In one embodiment, the heat exchanger includes a fin group 10, a heat exchange tube group 20 and a fixing plate 30 sleeved in the fin group 10, and a pipe 40 sleeved in the heat exchange tube group 20. The fin group 10 is composed of a plurality of fins, and the heat exchange tube group 20 is composed of a plurality of roughly cylindrical heat exchange tubes. Each fin is sleeved on the heat exchange tube group 20 at intervals along the length direction of the heat exchange tube, and separates each heat exchange tube so that the airflow can flow out along the gap formed between the fin and the heat exchange tube, and transfer heat to the fin and the heat exchange tube to increase the heat exchange efficiency of convection heat exchange and radiation heat exchange. The pipe 40 includes a connecting elbow, a return water joint and a water outlet joint. The connecting elbow is roughly U-shaped. The connecting elbow, the return water joint and the water outlet joint are respectively connected to the heat exchange tube group 20 to form a water flow channel.

[0035] In this embodiment, since the heat exchange tube is a round tube, the connecting tube 40 is also a round tube, and the outside is welded by a welding process. The welding process is simple and reduces the water leakage problem caused by welding leaks.

[0036] In another embodiment, annular inner abutment blocks 21 are provided at opposite ends of the heat exchange tube, and the inner abutment blocks 21 abut against the connecting pipe 40, so that the heat exchange tube and the connecting pipe 40 can rely on their own abutment, and the connecting pipe 40 and the heat exchange tube can form a multiple sealing effect through the abutment and sealing of the inner abutment blocks 21. In one embodiment, the heat exchange tube and the connecting pipe 40 are installed with interference fit, and the interference part can pierce the wall of the heat exchange tube to form a few bubbles, thereby reducing the generation of bubbles.

[0037] In this embodiment, the fin is provided with a plurality of circular flanged holes 11, a spoiler block group 12 disposed between the flanged holes 11, a first blocking block 13 disposed above the spoiler block group 12, and a second blocking block 14 disposed above the spoiler block group 12. The flanged holes 11 are used to sleeve the heat exchange tubes. The spoiler block group 12 is composed of a first spoiler block 120 and a plurality of second spoiler blocks 121. The second spoiler blocks 121 are disposed at opposite ends of the first spoiler block 120. The spoiler block group 12, the first blocking block 13, and the second blocking block 14 cooperate with the structure of the flanged holes 11 to play a good spoiling role, thereby slowing down the flow speed of the flue gas, so that the high-temperature flue gas can fully contact the heat exchange tubes, and improve the heat exchange efficiency.

[0038] The length of the first spoiler block 120 is greater than that of the second spoiler block 121. The first spoiler block 120 and the second spoiler block 121 are both arch structures formed by stamping. Due to the effect of stamping, punching holes will be left on the fins, and the airflow will flow between the spoiler blocks and the punching holes to improve the spoiler effect. The first blocking block 13 is a concave arc structure, and the second blocking block 14 is an inclined strip shape, which can slow down the speed of part of the airflow flowing out of each gap, and at the same time make the high-temperature flue gas collide with the heat exchange tube or fin before flowing out, so as to further improve the heat exchange efficiency.

[0039] In another embodiment, the width of the first blocking block 13 is equal to the width of the second blocking block 14, the width of the first blocking block 13 is greater than the width of the flange hole 11, and the width of the flange hole 11 is greater than the width of the spoiler block group 12, so as to ensure that there is enough gap between the fins and the spoilers to allow the airflow to flow out, and to prevent the high-temperature flue gas from being blocked in the heat exchanger. Optionally, the flange hole 11 is provided with a welding rod hole 15, which is located above the flange hole 11, so as to facilitate the insertion of the welding rod, melt the welding rod during brazing, and evenly flow along the heat exchange tube to weld with the fin.

[0040] In other embodiments, a matching protrusion 31 is provided on the fixing plate 30 , and the matching protrusion 31 is substantially in a circular ring shape, so as to facilitate the installation of the fixing plate 30 .

[0041] Optionally, the bottom of the fin is roughly wavy in structure to facilitate the inflow of airflow.

[0042] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A heat exchanger, characterized in that: It includes a fin group, a heat exchange tube group and a fixing plate sleeved in the fin group, and a connecting pipe sleeved in the heat exchange tube group, the fin group is composed of a plurality of fins, the heat exchange tube group is composed of a plurality of cylindrical heat exchange tubes, each of the fins is sleeved on the heat exchange tube group at intervals along the length direction of the heat exchange tube, and separates each of the heat exchange tubes, the connecting pipe includes a connecting elbow, a return water joint and a water outlet joint, the connecting elbow, the return water joint and the water outlet joint are respectively connected to the heat exchange tube group to form a water flow channel; the opposite ends of the heat exchange tube are provided with ring-shaped inner abutment blocks, the inner abutment blocks abut against the connecting pipe; the heat exchange tube and the connecting pipe are installed by interference fit.

2. The heat exchanger according to claim 1, characterized in that The fin is provided with a plurality of circular flanged holes, a spoiler block group arranged between the flanged holes, a first blocking block arranged above the spoiler block group, and a second blocking block arranged above the side of the spoiler block group. The flanged holes are used for sleeve-mounting the heat exchange tubes. The spoiler block group consists of a first spoiler block and a plurality of second spoiler blocks. The second spoiler blocks are arranged at opposite ends of the first spoiler block.

3. The heat exchanger according to claim 2, characterized in that A welding rod hole is provided on the flanging hole, and the welding rod hole is located above the flanging hole.

4. The heat exchanger according to claim 2, characterized in that The length of the first spoiler block is greater than that of the second spoiler block, and both the first spoiler block and the second spoiler block are arch structures formed by stamping.

5. The heat exchanger according to claim 2, characterized in that The first blocking block is in a downwardly concave arc shape, and the second blocking block is in an inclined bar shape.

6. The heat exchanger according to claim 2, characterized in that The width of the first blocking block protrusion is equal to the width of the second blocking block protrusion, the width of the first blocking block protrusion is greater than the width of the flange hole protrusion, and the width of the flange hole protrusion is greater than the width of the spoiler block group protrusion.

7. The heat exchanger according to claim 1, characterized in that The fixing plate is provided with a matching protrusion, and the matching protrusion is in a circular ring shape.

8. A gas-fired hot water boiler, characterized in that: Comprising a heat exchanger as claimed in any one of claims 1 to 7.

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