Heat exchanger of gas water heater and heat exchange fins of heat exchanger

Abstract

The utility model discloses a heat exchanger of a gas water heater and a heat exchange fin of the heat exchanger. The heat exchange fin comprises a front fin part and a rear fin part which are mutually stacked. A first tubing slot is formed in the front wing part, the head end of the first tubing slot extends upwards from the bottom edge of the front wing part, and the tail end of the first tubing slot is in a semi-arc shape; a second tubing slot is formed in the rear fin part, the head end of the second tubing slot extends downwards from the top edge of the rear fin part, and the tail end of the second tubing slot is in a semi-arc shape. Wherein the rear fin part and the front fin part are stacked into a whole, a fin through hole is formed in the staggered position of the tail end of the first pipe installing open groove and the tail end of the second pipe installing open groove, the heat exchange pipe can be directly pushed in from the first pipe installing open groove or the second pipe installing open groove, then the front fin part and the rear fin part are stacked, and the fin through hole clamping heat exchange pipe is formed. Excessive assembly gaps do not need to be reserved between the heat exchange tubes and the fin through holes, a tube expansion process does not need to be adopted, and damage caused by interference fit between the heat exchange tubes and the fin through holes is avoided.

Description

Technical Field

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

[0002] A gas water heater is a device used to heat water for bathing. It transfers heat from the gas to cold water through an internal heat exchanger, thus raising the water temperature. The heat exchanger consists of heat exchange fins and heat exchange tubes. The heat exchange tubes are inserted into pre-drilled holes in the heat exchange fins. The size of the holes is slightly larger than that of the heat exchange tubes to facilitate insertion. Then, an expansion process is used to enlarge the outer diameter of the heat exchange tubes to ensure a tight fit with the holes in the heat exchange fins, eliminating any gaps between them. Finally, welding is used to fix the heat exchange tubes to the heat exchange fins, allowing them to contact and exchange heat.

[0003] However, the tube expansion process can easily cause the heat exchange tube and the heat exchange fins to be pressed together by an interference fit, which can cause the inside of the heat exchange tube to crack under stress, reduce the service life of the heat exchange tube, and easily damage the heat exchange fins. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a heat exchanger and its heat exchange fins for a gas water heater to solve the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a heat exchange fin for a heat exchanger, comprising a front fin and a rear fin. A first tube-mounting slot is formed on the front fin, the first end of which extends upward from the bottom edge of the front fin, and the end of which is located inside the front fin, forming a semi-circular arc shape. A second tube-mounting slot is formed on the rear fin, the first end of which extends downward from the top edge of the rear fin, and the end of which is located inside the rear fin, also forming a semi-circular arc shape. The rear fin and the front fin are integrally stacked, with a fin through-hole formed at the intersection of the ends of the first and second tube-mounting slots, allowing the heat exchange tube to pass through. The front and rear fins are respectively welded and fixed to the heat exchange tube.

[0007] Preferably, a flow-guiding arc plate is provided on the front side of the forewing away from the hindwing. The flow-guiding arc plate protrudes on the front side of the forewing and is located next to the end of the first tube slot. The bottom of the flow-guiding arc plate is located on the center line of the forewing in the vertical direction.

[0008] Preferably, there are two flow-guiding arc plates, which are symmetrically arranged on the left and right sides of the end of the first pipe slot.

[0009] Preferably, forward-extending limiting flanges are formed on the left and right sides of the hind wing portion, and the limiting flanges are clamped on the left and right sides of the hind wing portion.

[0010] Preferably, the hindwing is a stainless steel sheet or an aluminum alloy sheet, and the forewing is a stainless steel sheet or an aluminum alloy sheet welded onto the hindwing.

[0011] Preferably, the end of the first tube slot is located on the centerline of the forewing, and the end of the second tube slot is located on the centerline of the hindwing.

[0012] This utility model provides a heat exchanger for a gas water heater, which includes a heat exchange tube and a plurality of heat exchange fins as described above. The plurality of heat exchange fins are arranged at intervals, and the heat exchange tube is sequentially inserted into the fin through holes of the plurality of heat exchange fins.

[0013] The technical effects achieved by this utility model include:

[0014] The heat exchange fins of the aforementioned heat exchanger are composed of two parts, a front fin and a rear fin, stacked together. When installing the heat exchange tube, the heat exchange tube can be first inserted into one of the tube mounting slots, and then the front and rear fins are stacked together to form a fin through hole to clamp the heat exchange tube. Therefore, the heat exchange tube can be of almost the same size as the fin through hole. There is no need to leave an excessive assembly gap between the heat exchange tube and the fin through hole. The heat exchange tube can be directly pushed in from the first or second tube mounting slot. After installation, it can be directly welded without the need for tube expansion process, thus avoiding the damage problem caused by the interference fit between the heat exchange tube and the fin through hole.

[0015] The design of the flow guide arc fins can guide the high-temperature airflow to flow around the heat exchange tube, which is beneficial to improving the heat exchange performance of the heat exchanger.

[0016] The limiting flange facilitates the determination of the relative positions of the forewing and hindwing, improving installation efficiency. Attached Figure Description

[0017] Figure 1 A schematic diagram of the heat exchange fins of the heat exchanger provided by this utility model;

[0018] Figure 2 This is a structural exploded view of the heat exchange fins;

[0019] Figure 3 This is a front view of the heat exchange fins;

[0020] Figure 4 This is a schematic diagram of the heat exchanger provided by this utility model.

[0021] The reference numerals in the above figures are as follows:

[0022] Fore wing 1, first tube slot 10, first end of first tube slot 10a, first end of first tube slot 10b, guide arc plate 11;

[0023] Rear wing 2, second tube slot 20, first end of second tube slot 20a, second end of second tube slot 20b, limiting flange 21;

[0024] Heat exchange tube 3, fin through hole 30. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of this utility model shown in and described with reference to the drawings are merely exemplary, and this utility model is not limited to these embodiments.

[0026] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related are omitted.

[0027] like Figure 1 and Figure 2 As shown, this embodiment of the present invention provides a heat exchanger fin, which includes a front fin portion 1 and a rear fin portion 2.

[0028] A first tube-mounting slot 10 is formed on the forewing portion 1. The first end 10a of the first tube-mounting slot 10 extends upward from the bottom edge of the forewing portion 1, and the last end 10b of the first tube-mounting slot 10 is located inside the forewing portion 1. The last end 10b of the first tube-mounting slot 10 is semi-circular. A second tube-mounting slot 20 is formed on the hindwing portion 2. The first end 20a of the second tube-mounting slot 20 extends downward from the top edge of the hindwing portion 2, and the last end 20b of the second tube-mounting slot 20 is located inside the hindwing portion 2. The last end 20b of the second tube-mounting slot 20 is semi-circular. Figure 3 and Figure 4 As shown, the rear wing 2 and the front wing 1 are stacked as a single unit, so that the end 10b of the first tube slot 10 and the end 20b of the second tube slot 20 intersect to form a fin through hole 30, which is used for the heat exchange tube 3 to pass through the fin through hole 30. The front wing 1 and the rear wing 2 are respectively welded and fixed to the heat exchange tube 3.

[0029] The heat exchange fins of the aforementioned heat exchanger are formed by stacking front fin 1 and rear fin 2. The heat exchange tube 3 is enclosed by the first tube mounting slot 10 and the second tube mounting slot 20 to allow the heat exchange tube 3 to pass through the heat exchange fins. When installing the heat exchange tube 3, the heat exchange tube 3 can be inserted into one of the tube mounting slots first, and then the front fin 1 and the rear fin 2 are stacked to form the fin through hole 30 to clamp the heat exchange tube 3. Therefore, the heat exchange tube 3 can adopt the same size as the fin through hole 30. There is no need to leave an assembly gap between the heat exchange tube 3 and the fin through hole 30. The heat exchange tube 3 can be directly pushed in from the first tube mounting slot 10 or the second tube mounting slot 20. After installation, the front fin 1, the rear fin 2 and the heat exchange tube 3 can be directly welded and fixed together at the fin through hole 30 without the need for tube expansion process, thus avoiding the damage problem caused by the interference fit between the heat exchange tube 3 and the fin through hole 30.

[0030] Furthermore, referring to Figure 3 and Figure 4 As shown, a flow-guiding arc plate 11 is provided on the front side of the forewing portion 1 opposite to the rearwing portion 2. The flow-guiding arc plate 11 protrudes on the front side of the forewing portion 1 and is located next to the end 10b of the first tube slot 10. The A-A' curve in the figure represents the predetermined flow direction of the airflow in the above structure. Due to the setting of the first tube slot 10, a depression is formed on the surface of the heat exchange fins, making it easier for the airflow to move upward from the beginning 10a of the first tube slot 10 toward the heat exchange tube 3. After being blocked by the heat exchange tube 3, the airflow will flow around the heat exchange tube 3 from the left and right sides of the heat exchange tube 3 under the guidance of the flow-guiding arc plate 11. This can gather and guide the high-temperature airflow to concentrate and flow toward the heat exchange tube 3, which is beneficial to improving the heat exchange performance of the heat exchanger.

[0031] Specifically, there are two flow-guiding arc plates 11, which are symmetrically arranged on the left and right sides of the end of the first tube slot. The bottom of the flow-guiding arc plate 11 is located on the center line of the front wing 1 in the vertical direction.

[0032] To facilitate positioning when the hindwing 2 is stacked onto the forewing 1, forward-extending limiting flanges 21 are formed on the left and right sides of the hindwing 2. The limiting flanges 21 are clamped on the left and right sides of the hindwing 2, limiting the relative position between the hindwing 2 and the forewing 1, thereby improving installation efficiency and achieving higher installation accuracy.

[0033] The tube expansion process requires the heat exchange tube to have sufficient deformation capacity, making it difficult to select heat exchange tubes made of materials such as stainless steel with reliable hardness. However, the fin structure used in this embodiment does not require the tube expansion process. Therefore, in this embodiment, the rear fin 2 is a stainless steel sheet or an aluminum alloy sheet, and the front fin 1 is a stainless steel sheet or an aluminum alloy sheet welded onto the rear fin 2. These are commonly used materials with high durability.

[0034] For example, the end 10b of the first tube slot 10 is located on the center line of the forewing portion 1, and the end 20b of the second tube slot 20 is located on the center line of the hindwing portion 2.

[0035] like Figure 4 As shown, this utility model embodiment also provides a heat exchanger for a gas water heater, which includes a heat exchange tube 3 and a plurality of heat exchange fins as described above. The plurality of heat exchange fins are arranged at intervals, and the heat exchange tube 3 is sequentially inserted into the fin through holes 30 of the plurality of heat exchange fins.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A heat exchanger fin, characterized in that, include: The forewing (1) has a first tube slot (10) formed thereon. The first end (10a) of the first tube slot (10) extends upward from the bottom edge of the forewing (1) and the end (10b) of the first tube slot (10) is located inside the forewing (1). The end (10b) of the first tube slot (10) is semi-circular. The hind wing (2) has a second tube slot (20) formed thereon. The first end (20a) of the second tube slot (20) extends downward from the top edge of the hind wing (2), and the end end (20b) of the second tube slot (20) is located inside the hind wing (2). The end end (20b) of the second tube slot (20) is semi-circular. The rear wing (2) and the front wing (1) are stacked together, so that the end (10b) of the first tube slot (10) and the end (20b) of the second tube slot (20) intersect to form a fin through hole (30) for the heat exchange tube (3) to pass through the fin through hole (30). The front wing (1) and the rear wing (2) are respectively welded and fixed to the heat exchange tube (3).

2. The heat exchange fins of the heat exchanger according to claim 1, characterized in that, A flow-guiding arc plate (11) is provided on the front side of the forewing (1) away from the hindwing (2). The flow-guiding arc plate (11) protrudes on the front side of the forewing (1) and is located next to the end (10b) of the first tube slot (10).

3. The heat exchange fins of the heat exchanger according to claim 2, characterized in that, There are two flow-guiding arc plates (11). The two flow-guiding arc plates (11) are symmetrically arranged on the left and right sides of the end of the first tube slot. The bottom of the flow-guiding arc plate (11) is located on the center line of the front wing (1) in the vertical direction.

4. The heat exchange fins of the heat exchanger according to claim 1, characterized in that, The left and right sides of the hindwing (2) are provided with forward-extending limiting flanges (21), which are sandwiched between the left and right sides of the hindwing (2).

5. The heat exchange fins of the heat exchanger according to claim 1, characterized in that, The hind wing (2) is a stainless steel sheet or an aluminum alloy sheet, and the forewing (1) is a stainless steel sheet or an aluminum alloy sheet welded onto the hind wing (2).

6. The heat exchange fins of the heat exchanger according to claim 1, characterized in that, The end (10b) of the first tube slot (10) is located on the center line of the forewing (1), and the end (20b) of the second tube slot (20) is located on the center line of the hindwing (2).

7. A heat exchanger for a gas water heater, characterized in that, It includes a heat exchange tube (3) and a plurality of heat exchange fins as described in any one of claims 1 to 6, wherein the plurality of heat exchange fins are arranged at intervals between each other, and the heat exchange tube (3) is sequentially inserted into the fin through holes (30) of the plurality of heat exchange fins.

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