Heat exchanger and gas water heater comprising same

Abstract

The heat exchanger comprises a shell and a plurality of heat exchange tubes, end plate assemblies are installed at the two ends of the shell, each end plate assembly comprises an inner end plate and an outer end plate which are arranged in an overlapped mode, the outer end plate is provided with a sunken part which is sunken in the direction away from the inner end plate, and the inner end plate and the outer end plate are arranged in a staggered mode. The peripheral side of the concave part is welded and sealed with the inner end plate; through holes with the number corresponding to that of the heat exchange pipes are formed in the inner end plate, the ends of the heat exchange pipes penetrate through the through holes, the peripheral walls of the heat exchange pipes and the hole walls of the through holes are arranged in a sealed mode, and the output end of one heat exchange pipe of every two adjacent heat exchange pipes communicates with the input end of the other heat exchange pipe through a concave part. According to the heat exchanger, the outer end plates provided with the concave portions cover the ends of the heat exchange pipes so as to achieve circulation of media between the adjacent heat exchange pipes, the outer end plates with the concave portions are arranged at the two ends of each heat exchange pipe respectively, communication among the multiple heat exchange pipes is achieved, consumed materials are few, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to a heat exchanger and a gas water heater comprising the heat exchanger. Background Art

[0002] Gas water heaters have the characteristics of fast hot water output, good constant temperature performance, high efficiency and energy saving, etc. In modern life, they are loved by more and more families. Gas water heaters mainly include three systems: water system, gas system and electronic control system. The water system includes heat exchangers and water inlet and outlet joints.

[0003] The heat exchanger is located above the burner, and generally includes a shell and multiple heat exchange tubes. The multiple heat exchange tubes are arranged in parallel in the shell. A bent tube is welded between the output end of one heat exchange tube and the input end of another heat exchange tube to achieve the circulation of the medium in the two heat exchange tubes. However, due to the large number of heat exchange tubes included in the heat exchanger, it is necessary to weld multiple bent tubes, which requires more consumables and has a high cost. In addition, the distance between adjacent heat exchange tubes connected by the bent tubes is relatively close, and it is difficult to weld the opposite sides of the two heat exchange tubes to the bent tube. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect that the heat exchanger in the prior art needs multiple bent tubes to achieve communication between the heat exchange tubes, which is costly, and to provide a heat exchanger and a gas water heater containing the same.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] The utility model provides a heat exchanger, which comprises:

[0007] A shell, with end plate assemblies installed at both ends of the shell, the end plate assembly comprising an inner end plate and an outer end plate arranged in a stacked manner, the outer end plate being provided with a recessed portion recessed in a direction away from the inner end plate, and the circumference of the recessed portion being welded and sealed with the inner end plate;

[0008] There are multiple heat exchange tubes, and the inner end plate is provided with through holes corresponding to the number of the heat exchange tubes. The ends of the heat exchange tubes pass through the through holes, and the outer peripheral walls of the heat exchange tubes are sealed with the hole walls of the through holes. The output end of one of the two adjacent heat exchange tubes is connected to the input end of the other heat exchange tube through the recessed portion.

[0009] In the present solution, the above-mentioned structural form is adopted, and the outer end plate with a recessed portion is covered on the end of the heat exchange tube to realize the circulation of the medium between the adjacent heat exchange tubes. It can be seen that at both ends of the heat exchange tube, only one outer end plate including a recessed portion needs to be respectively provided to realize the connection between multiple heat exchange tubes, and the required consumables are less, which greatly reduces the material cost; in addition, the recessed portion located on the outer side of two adjacent heat exchange tubes is welded to the inner end plate, and there is no need to perform welding operation on the opposite side of the two heat exchange tubes, that is, during welding, there will be no interference between the recessed portion and the opposite side of the two heat exchange tubes sharing the same recessed portion, which is convenient for the staff to perform welding operations.

[0010] Preferably, the number of the recessed portions on the outer end plate on the same side is at least two.

[0011] In this solution, the above-mentioned structural form is adopted, and a plurality of recessed portions are provided on the outer end plate to achieve communication between at least five heat exchange tubes, thereby increasing the heat transfer coefficient of the heat exchanger by increasing the number of heat exchange tubes.

[0012] Preferably, a slot is provided on the outer end plate, and one slot is provided between two adjacent recessed portions.

[0013] In the present solution, the above-mentioned structural form is adopted, and slots are set between the recessed parts. If cross-flow occurs, the medium will flow out from the slots, which is convenient for timely detection of whether the welding is firm and inspection of whether cross-flow occurs, so as to carry out repairs or replacements in time to stop the loss and avoid affecting the use effect of the heat exchanger.

[0014] Preferably, the heat exchanger further includes an inlet section and an outlet section. Along the flow direction of the medium, the inlet section is connected to the input end of the first heat exchange tube, and the outlet section is connected to the output end of the last heat exchange tube. The inlet section and the outlet section respectively pass through the inner end plate and the outer end plate in sequence to communicate with the outside.

[0015] In this solution, the above-mentioned structural form is adopted, and the inlet section and the outlet section respectively penetrate the outer end plate to realize the inflow and outflow of the medium, and the spatial layout is reasonable.

[0016] Preferably, the peripheral side of the outer end plate is fixed to the inner end plate.

[0017] In this solution, the above-mentioned structural form is adopted to further improve the fixing effect between the outer end plate and the inner end plate.

[0018] Preferably, a heat insulating member is installed on the inner wall surface of the shell.

[0019] In this solution, the above-mentioned structural form is adopted to isolate the heat exchange tube from the side plate of the shell through the heat insulation component, thereby reducing the temperature rise of the side plate.

[0020] Preferably, the inner end plate is provided with reinforcing ribs.

[0021] In the present solution, the above-mentioned structural form is adopted, and reinforcing ribs are provided on the inner end plate to improve the strength of the inner end plate, thereby reducing or avoiding deformation or even breakage of the inner end plate during use, thereby improving the service life of the device; in addition, by avoiding deformation of the inner end plate, it is also possible to ensure that the recessed portion and the inner end plate are firmly welded.

[0022] Preferably, the reinforcing ribs extend along the length direction of the inner end plate;

[0023] The number of the reinforcing ribs is two, and the two reinforcing ribs are arranged at intervals along the height direction of the inner end plate.

[0024] In this solution, the above-mentioned structural form is adopted, and the strength of the inner end plate is further strengthened by providing two reinforcing ribs.

[0025] Preferably, the outer end plate is located between the two reinforcing ribs, and the reinforcing ribs are recessed toward the direction approaching the inner end plate on the other side.

[0026] In this solution, by adopting the above-mentioned structural form, when the recessed part and the inner end plate are welded, the reinforcing ribs on the inner end plate will not interfere with the recessed part, which facilitates the operation.

[0027] The utility model also provides a gas water heater, which comprises the heat exchanger as described above.

[0028] The positive and progressive effects of the utility model are:

[0029] The heat exchanger in the utility model covers the end of the heat exchange tube with an outer end plate provided with a recessed portion to realize the circulation of the medium between the adjacently arranged heat exchange tubes. It can be seen that, at both ends of the heat exchange tube, only one outer end plate including a recessed portion needs to be respectively provided to realize the connection between multiple heat exchange tubes, and the required consumables are less, which greatly reduces the material cost; in addition, the recessed portions located on the outer sides of two adjacently arranged heat exchange tubes are welded to the inner end plate, and there is no need to perform welding operation on the opposite sides of the two heat exchange tubes, that is, during welding, there will be no interference between the recessed portions and the opposite sides of the two heat exchange tubes sharing the same recessed portion, which facilitates the welding operation by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of a heat exchanger according to a preferred embodiment of the present utility model.

[0031] Figure 2 This is a schematic structural diagram of a heat exchanger from another angle according to a preferred embodiment of the present invention.

[0032] Figure 3 This is a schematic structural diagram of the inner end plate of a preferred embodiment of the utility model.

[0033] Figure 4 This is a schematic structural diagram of an outer end plate of a preferred embodiment of the utility model.

[0034] Figure 5 This is a schematic structural diagram of the outer end plate of a preferred embodiment of the utility model from another angle.

[0035] Figure 6 It is a partial cross-sectional view of a heat exchanger according to a preferred embodiment of the present utility model.

[0036] Figure 7 for Figure 6 Enlarged view of point A in the middle.

[0037] Figure 8 This is a partial cross-sectional view from another angle of the heat exchanger of a preferred embodiment of the present invention.

[0038] Fig. 9 This is a cross-sectional view of a heat exchanger according to a preferred embodiment of the present invention.

[0039] Description of reference numerals:

[0040] Shell 1

[0041] End plate assembly 2

[0042] Inner end plate 21

[0043] Through hole 211

[0044] Reinforcement 212

[0045] Outer end plate 22

[0046] Depression 221

[0047] Slot 222

[0048] Heat exchange tube 3

[0049] Inlet section 4

[0050] Exit Section 5

[0051] Thermal insulation 6

[0052] Heat exchange fin 7 DETAILED DESCRIPTION

[0053] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the following embodiments.

[0054] Please combine Figures 1 to 9For understanding, an embodiment of the utility model provides a heat exchanger, which includes a shell 1 and a plurality of heat exchange tubes 3. End plate assemblies 2 are installed at both ends of the shell 1. The end plate assembly 2 includes an inner end plate 21 and an outer end plate 22 that are stacked. The outer end plate 22 is provided with a recessed portion 221 that is recessed in a direction away from the inner end plate 21. The circumferential side of the recessed portion 221 is welded and sealed to the inner end plate 21. The inner end plate 21 is provided with through holes 211 corresponding to the number of the heat exchange tubes 3. The ends of the heat exchange tubes 3 pass through the through holes 211, and the outer peripheral walls of the heat exchange tubes 3 are sealed to the hole walls of the through holes 211. The output end of one of the two adjacent heat exchange tubes 3 is connected to the input end of the other heat exchange tube 3 through the recessed portion 221. In other words, the inner end plate 21 fixes the heat exchange tube 3 through the through hole 211, and the inner end plate 21 and the recessed portion 221 enclose a closed space, and the end of the heat exchange tube 3 extends into the closed space and is spaced apart from the recessed portion 221, so that along the flow direction of the medium, the adjacent heat exchange tubes 3 are connected through the recessed portion 221. Specifically, the recessed portion 221 and the inner end plate 21 are circumferentially welded and sealed, and are connected by brazing.

[0055] In this embodiment, the outer end plate 22 provided with the recessed portion 221 is covered on the end of the heat exchange tube 3 to realize the circulation of the medium between the adjacently arranged heat exchange tubes 3. It can be seen that, at both ends of the heat exchange tube 3, only one outer end plate 22 including the recessed portion 221 needs to be respectively provided to realize the connection between multiple heat exchange tubes 3, and the required consumables are less, which greatly reduces the material cost; in addition, the recessed portion 221 located on the outer side of two adjacently arranged heat exchange tubes 3 is welded to the inner end plate 21, and there is no need to perform welding operation on the opposite sides of the two heat exchange tubes 3, that is, during welding, there will be no interference between the recessed portion 221 and the opposite sides of the two heat exchange tubes 3 sharing the same recessed portion 221, which is convenient for the staff to perform welding operations.

[0056] In this embodiment, if Figure 1 and Figure 2 As shown, there are at least two recessed portions 221 on the same side outer end plate 22. A plurality of recessed portions 221 are provided on the outer end plate 22 to achieve communication between at least five heat exchange tubes 3, thereby increasing the heat exchange coefficient of the heat exchanger by increasing the number of heat exchange tubes 3.

[0057] In this embodiment, if Figure 6 , Figure 7 and Figure 8, a slot 222 is provided on the outer end plate 22, and a slot 222 is provided between two adjacent recessed parts 221. If the welding between the recessed parts 221 and the inner end plate 21 is not firm, it will cause the circulating medium in the adjacent recessed parts 221 to flow in series, which will affect the heat exchange effect. By providing the slot 222 between the recessed parts 221, if the cross flow occurs, the medium will flow out from the slot 222, which is convenient for timely detection of whether the welding is firm and whether the cross flow occurs, so as to timely perform repairs or replacements to stop the loss and avoid affecting the use effect of the heat exchanger. Specifically, the slot 222 is located on the outside of the welding between the recessed part 221 and the outer end plate 22.

[0058] In this embodiment, if Figure 1 and Figure 2 As shown, the heat exchanger further includes an inlet section 4 and an outlet section 5. Along the flow direction of the medium, the inlet section 4 is connected to the input end of the first heat exchange tube 3, and the outlet section 5 is connected to the output end of the last heat exchange tube 3. The inlet section 4 and the outlet section 5 respectively pass through the inner end plate 21 and the outer end plate 22 in sequence to communicate with the outside. In other words, the inlet section 4, the plurality of heat exchange tubes 3 connected in sequence, and the outlet section 5 are connected in sequence. The inlet section 4 and the outlet section 5 respectively pass through the outer end plate 22 to realize the inflow and outflow of the medium, and the spatial layout is reasonable.

[0059] Specifically, Figure 1 , Figure 2 and Figure 8 As shown, the heat exchanger includes 10 heat exchange tubes 3, which are divided into two rows and five columns. The inlet section 4 is connected to the fifth column of the upper row of heat exchange tubes. The output end of the first heat exchange tube is connected to the input end of the fourth column of the upper row of heat exchange tubes through the recessed portion 221 on the second side. The output end of the fourth column of the upper row of heat exchange tubes is connected to the input end of the third column of the upper row of heat exchange tubes through the recessed portion 221 on the first side. Through the above-mentioned method, the connection between the five heat exchange tubes in the upper row is achieved; the output end of the first column of the upper row of heat exchange tubes is connected to the input end of the first column of the lower row of heat exchange tubes through the recessed portion 221 extending up and down in the second side, and they are connected in accordance with the connection method between the heat exchange tubes in the upper row to achieve the connection between the five heat exchange tubes 3 in the lower row. The output end of the fifth column of the lower row of heat exchange tubes, which is the last heat exchange tube, passes through the inner end plate 21 and the outer end plate 22 in sequence to be connected to the outlet section 5.

[0060] Specifically, Figure 1 As shown, the outer end plate 22 located on the first side of the housing 1 is provided with two rows and two columns of recessed portions 221, and the four recessed portions 221 extend along the width direction of the housing 1, and a slot 222 is provided between each adjacent recessed portion 221, and the multiple slots 222 are interconnected to form a cross-shaped slot. Figure 2As shown, on the outer end plate 22 located on the second side of the housing 1, in addition to two rows and two columns of recesses 221 extending along the width direction of the housing 1, there is also a recess 221 extending along the height direction of the housing 1 on the right side of these four recesses 221. Slots 222 are provided between adjacent recesses 221, and multiple slots 222 communicate with each other to form a groove similar to the Chinese character "tu" (土).

[0061] In this embodiment, the peripheral side of the outer end plate 22 is fixed to the inner end plate 21, further improving the fixing effect between the outer end plate 22 and the inner end plate 21. Preferably, the outer end plate 22 and the inner end plate 21 are fixed by circumferential welding.

[0062] In this embodiment, as Figure 8 and Fig. 9 shown, a heat insulation member 6 is installed on the inner wall surface of the housing 1. The heat exchange tube 3 is isolated from the side plate of the housing 1 through the heat insulation member 6, reducing the temperature rise of the side plate. Specifically, the heat insulation member 6 is made of high-temperature resistant sealing felt.

[0063] Specifically, as Figure 1 and Fig. 9 shown, heat exchange fins 7 are provided in the housing 1. Multiple heat exchange fins 7 are overlapped in sequence, and the heat exchange tube 3 passes through the heat exchange fins 7. The heat insulation member 6 is placed between the heat exchange fins 7 and the inner wall of the housing 1.

[0064] Specifically, two heat insulation members 6 are respectively installed on the inner wall surfaces on both sides of the housing 1 and are arranged at intervals along the width direction of the housing 1. The heat insulation member 6 extends along the length direction of the housing 1.

[0065] In this embodiment, as Figure 2 and Figure 3 shown, reinforcing ribs 212 are provided on the inner end plate 21. By providing the reinforcing ribs 212 on the inner end plate 21, the strength of the inner end plate 21 is improved, reducing or avoiding the deformation or even fracture of the inner end plate 21 during use and improving the service life of the device; in addition, by avoiding the deformation of the inner end plate 21, the welding between the recess 221 and the inner end plate 21 can also be ensured to be firm.

[0066] In this embodiment, as Figure 1 and Figure 2 shown, the reinforcing ribs 212 extend along the length direction of the inner end plate 21; the number of the reinforcing ribs 212 is two, and the two reinforcing ribs 212 are arranged at intervals along the height direction of the inner end plate 21. By providing two reinforcing ribs 212, the strength of the inner end plate 21 is further enhanced.

[0067] In this embodiment, the outer end plate 22 is located between the two reinforcing ribs 212, and the reinforcing rib 212 is recessed toward the other inner end plate 21. When the recessed portion 221 is welded to the inner end plate 21, the reinforcing rib 212 on the inner end plate 21 and the recessed portion 221 will not interfere with each other, which is convenient for operation.

[0068] The embodiment of the utility model further provides a gas water heater, which includes the heat exchanger as described above.

[0069] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A heat exchanger, characterized in that: The heat exchanger comprises: A shell, with end plate assemblies installed at both ends of the shell, the end plate assembly comprising an inner end plate and an outer end plate arranged in a stacked manner, the outer end plate being provided with a recessed portion recessed in a direction away from the inner end plate, and the circumference of the recessed portion being welded and sealed with the inner end plate; There are multiple heat exchange tubes, and the inner end plate is provided with through holes corresponding to the number of the heat exchange tubes. The ends of the heat exchange tubes pass through the through holes, and the outer peripheral walls of the heat exchange tubes are sealed with the hole walls of the through holes. The output end of one of the two adjacent heat exchange tubes is connected to the input end of the other heat exchange tube through the recessed portion.

2. The heat exchanger according to claim 1, characterized in that The number of the recessed parts on the outer end plate on the same side is at least two.

3. The heat exchanger according to claim 2, characterized in that The outer end plate is provided with a slot, and one slot is provided between two adjacent recessed portions.

4. The heat exchanger according to claim 1, characterized in that The heat exchanger also includes an inlet section and an outlet section. Along the flow direction of the medium, the inlet section is connected to the input end of the first heat exchange tube, and the outlet section is connected to the output end of the last heat exchange tube. The inlet section and the outlet section respectively pass through the inner end plate and the outer end plate in sequence to communicate with the outside.

5. The heat exchanger according to claim 1, characterized in that The peripheral side of the outer end plate is fixed to the inner end plate.

6. The heat exchanger according to claim 1, characterized in that A heat insulating member is installed on the inner wall surface of the shell.

7. The heat exchanger according to claim 1, characterized in that The inner end plate is provided with reinforcing ribs.

8. The heat exchanger according to claim 7, characterized in that The reinforcing ribs extend along the length direction of the inner end plate; The number of the reinforcing ribs is two, and the two reinforcing ribs are arranged at intervals along the height direction of the inner end plate.

9. The heat exchanger according to claim 8, characterized in that The outer end plate is located between the two reinforcing ribs, and the reinforcing ribs are recessed toward the direction approaching the inner end plate on the other side.

10. A gas water heater, characterized in that: The gas water heater comprises a heat exchanger as claimed in any one of claims 1 to 9.

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