Fin type heat exchanger

Abstract

The utility model provides a fin type heat exchanger which comprises a plurality of heat exchange tubes, a plurality of fins and a tube plate, the fins are arranged in parallel at intervals in the length direction of the heat exchange tubes, a plurality of fixing holes are formed in the fins at intervals, and the heat exchange tubes are arranged in the fixing holes in a penetrating mode. The tube plate is arranged at the outer ends of the fins in the axis direction of the heat exchange tube, a tube hole is formed in the position, corresponding to the heat exchange tube, of the tube plate, the tube hole and the heat exchange tube are coaxially arranged, and the hole diameter R1 of the tube hole is larger than the outer diameter R2 of the heat exchange tube; damage caused by collision between the heat exchange tubes and the tube holes during operation is avoided, and heat of the heat exchange tubes is prevented from being conducted to the tube plate to affect heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a finned heat exchanger. Background Technology

[0002] Existing finned heat exchangers are widely used in heat exchange, refrigeration, and heating fields. A finned heat exchanger consists of multiple fins, heat exchange tubes, and two tube sheets. The multiple fins are spaced apart, and the two tube sheets are located on both sides of the fins to prevent the multiple fins from falling over. The tube sheets have insertion holes for heat exchange tube assembly. During assembly, the heat exchange tubes are expanded so that the outer wall of the heat exchange tubes is tightly fitted with the insertion holes of the tube sheet. During system operation, the heat exchange tubes vibrate and rub against the tube sheet, which can easily cause damage to the heat exchange tubes. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a finned heat exchanger that avoids frictional damage between the tube sheet and all heat exchange tubes.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A finned heat exchanger includes multiple heat exchange tubes, multiple fins, and a tube sheet. The multiple fins are arranged parallel to each other at intervals along the length of the heat exchange tubes. Multiple fixing holes are arranged at intervals on the fins, and the heat exchange tubes pass through the fixing holes. The tube sheet is disposed at the outer ends of the multiple fins along the axial direction of the heat exchange tubes. The tube sheet has tube holes at corresponding positions on the heat exchange tubes. The tube holes are coaxially arranged with the heat exchange tubes, and the diameter R1 of the tube holes is larger than the outer diameter R2 of the heat exchange tubes.

[0006] Understandably, the clearance fit between the heat exchange tubes and the tube sheet holes prevents friction and collision between the heat exchange tubes and the tube sheet during operation, thus avoiding damage to the copper tubes; and also prevents heat from the heat exchange tubes from being conducted to the tube sheet, thus affecting heat dissipation efficiency.

[0007] Furthermore, the aperture R1 of the tube hole and the outer diameter R2 of the heat exchange tube satisfy the following relationship: 6mm ≥ R1 - R2 ≥ 3mm. It is understandable that, due to the clearance fit between the heat exchange tube and the tube sheet, when the heat exchanger is running, if the aperture diameter is too small and the clearance between the tube and the tube is too small, it will cause the heat exchange tube to collide and rub against the aperture, potentially damaging the copper tube; if the clearance is too large, it will lead to serious air leakage, thus affecting the heat exchange efficiency.

[0008] Furthermore, the finned heat exchanger also includes an inlet pipe and an outlet pipe, with a portion of the heat exchange pipe connected to the inlet pipe or the outlet pipe, and the diameter of the pipe hole coaxially arranged with the inlet pipe or the outlet pipe being larger than the diameter of the remaining pipe holes.

[0009] It is understandable that the heat exchanger is equipped with inlet and outlet pipes at the upper and lower ends. The vibration has a significant impact on the welded joints of the inlet and outlet pipes with the heat exchange tubes. Therefore, the tube holes at the ends of the tube sheet need to be set with a relatively large diameter to avoid the heat exchange tubes at both ends from vibrating and colliding with the tube holes.

[0010] To simplify the processing and improve the aesthetics, the pipe hole is a through hole without flanges, and / or the fixing hole is a through hole with flanges.

[0011] Furthermore, the finned heat exchanger also includes two end plates, which extend along the thickness direction of the tube sheet and are connected to the tube sheet, positioned between the two tube sheets. It can be understood that the end plates and tube sheets form a fixed frame, supporting the overall structure.

[0012] Furthermore, the projection along the length of the heat exchange tube completely covers the fins, and / or the projection of the end plate along the spacing direction of the heat exchange tube completely covers the projected area of ​​the plurality of fins.

[0013] Understandably, the frame formed by the tube sheet and end plates serves both a supporting and protective function, reducing the impact of impacts on the heat exchange tubes and fins. When the width and height of the tube sheet can cover the fins (i.e., the tube sheet area is larger than the fin area), and the width and length of the end plates can cover all the arranged fins, it can provide effective protection.

[0014] Furthermore, the finned heat exchanger also includes a support plate, with both ends of the support plate connected to the two end plates respectively. It is understood that multiple support plates can be spaced apart along the length of the finned heat exchanger to improve the overall structural stability.

[0015] To reduce the impact of the support plate on heat dissipation efficiency, the support plate is further provided with multiple through holes, which are spaced apart along the length of the support plate.

[0016] Furthermore, the side of the support plate closest to the fin contacts the fin. It can be understood that the two opposing support plates, by contacting the fin, fix the fin in place, increasing the overall stability of the heat exchanger.

[0017] Furthermore, the tube sheet is provided with a first folded edge, which extends along the thickness direction of the tube sheet and has a fully penetrating fixing hole; and / or, the support plate is provided with a second folded edge, which extends along the thickness direction of the support plate and has a fully penetrating fixing hole; and / or, the end plate is provided with a third folded edge, which extends along the thickness direction of the end plate and has a fully penetrating fixing hole.

[0018] Understandably, the tube sheet and end plate are made of sheet metal. Folding the four sides increases the strength of the frame. Folding the tube sheet can wrap around the part of the heat exchange tube that extends out of the tube sheet, providing better protection and facilitating the connection between the tube sheet and the end plate, thus enhancing the strength of the connection.

[0019] This utility model provides a finned heat exchanger with a clearance fit between the heat exchange tubes and the tube sheet, thereby avoiding damage caused by collision between the heat exchange tubes and the tube holes during operation, and preventing the heat from the heat exchange tubes from being conducted to the tube sheet, which would affect the heat dissipation efficiency. At the same time, the high-frequency vibration of the heat exchange tubes disturbs the surrounding air, further improving the heat exchange efficiency. Secondly, by changing the overall support method, the conventional heat exchanger is supported by a frame composed of a tube sheet, end plate, and support plate, which is in contact with the fins, instead of the conventional method of supporting the heat exchange tubes by expansion joints with the tube sheet. This increases the support area and improves the stability of the heat exchanger. Attached Figure Description

[0020] Figure 1 This is a perspective view of the finned heat exchanger described in this utility model.

[0021] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0022] Figure 3 This is a left view of the finned heat exchanger described in this utility model.

[0023] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle.

[0024] Among them, 1-heat exchange tube, 2-fins, 3-tube sheet, 4-end plate, 5-support plate, 6-inlet pipe, 7-outlet pipe, 31-pipe hole, 32-first fold, 41-third fold, 51-second fold. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] like Figure 1-Figure 4As shown, a finned heat exchanger includes multiple heat exchange tubes 1, multiple fins 2, tube sheet 3, end plate 4, and support plate 5. The multiple fins 2 are arranged parallel to each other at intervals along the length of the heat exchange tubes 1. The fins 2 are thin plate structures, and multiple fixing holes are punched at intervals on the fins 2. The fixing holes are flanged through holes, each flanged through hole being used to insert a corresponding heat exchange tube. The flanged structure of the fixing holes is used to abut against adjacent fins 2, increasing the overall stability of the heat exchanger. The heat exchange tubes 1 are connected to the fixing holes by expansion joints. A tube sheet 3 is provided at the outer end of the fins 2 along the axial direction of the heat exchange tubes 1. End plates 4 are provided at the upper and lower outer ends of the fins 2, and the end plates 4 contact the upper and lower end faces of the multiple fins 2. At least one support plate 5 is provided at at least one of the front and rear outer ends of the fins 2. In this embodiment, three support plates 5 are vertically arranged on the front and back of the heat exchanger. The three support plates 5 are evenly spaced along the length of the heat exchange tube 1 to improve the overall support. The tube sheet 3 has tube holes 31 at the corresponding positions of the heat exchange tube 1. The tube holes 31 can be flanged through holes or unflanged through holes. In this embodiment, the tube holes 31 are unflanged through holes to simplify the processing technology and improve production efficiency. The tube holes 31 are coaxial with the corresponding heat exchange tube 1. The diameter R1 of the tube hole 3 is larger than the outer diameter R2 of the heat exchange tube 1. The heat exchange tube 1 and the tube hole of the tube sheet 3 are fitted with a clearance to avoid friction and collision between the heat exchange tube 1 and the tube sheet 3 during operation, which would damage the copper tube. The end plate 4 is screwed to the tube sheet 3 to form a support frame. The support plate 5 is screwed to the end plate 2 to strengthen the support.

[0027] To avoid collision and friction between the heat exchange tube and the tube hole due to an excessively small gap between the tube hole diameter R1 and the outer diameter R2 of the heat exchange tube, the following condition must be met: R1-R2≥3mm. However, if the gap is too large, it will lead to serious air leakage and affect the heat exchange efficiency. Therefore, the following condition must also be met: R1-R2≤6mm.

[0028] Two sets of parallel tube sheets 3 and end plates 4 are connected to each other to form an overall frame. The frame serves both a supporting and protective function. Specifically, the vertical projection of the tube sheet 3 can cover the fins 2, while the vertical projection of the end plate 4 covers all the fins 2 arranged parallel to the heat exchange tube 1.

[0029] To further enhance the protective function of the frame and facilitate the connection between the tube plate 3 and the end plate 4, the tube plate 3 is provided with a first folded edge 32, which extends along the thickness direction of the tube plate 3 and has a fully penetrating fixing hole; and / or, the support plate 5 is provided with a second folded edge 51, which extends along the thickness direction of the support plate 5 and has a fully penetrating fixing hole; and / or, the end plate 4 is provided with a third folded edge 41, which extends along the thickness direction of the end plate 4 and has a fully penetrating fixing hole. Specifically, the tube sheet 3, end plate 4 and support plate 5 are provided with folded edges on all four sides. The folded edges extend along the thickness direction of the tube sheet 3, end plate 4 and support plate 5. Corresponding folded edges are arranged in parallel. The folded edge folding direction is opposite to the fin 2. The folded edge is perpendicular to the plane of the tube sheet 3, support plate 5 and end plate 4. The folded edges of the tube sheet 3, support plate 5 and end plate 4 are provided with multiple through holes for fixing. After the tube sheet 3 is folded, it can wrap around the part of the heat exchange tube 1 that extends out of the tube sheet 3.

[0030] To avoid affecting the overall strength of the tube sheet 3 if the spacing between the holes 31 is too small, specifically, the spacing between the holes 31 is greater than or equal to 3mm.

[0031] To prevent the support plate 5 from blocking the wind and affecting the overall heat exchange efficiency, the support plate 5 is provided with multiple through holes, which are spaced apart along the length of the support plate 5. In this embodiment, the through holes are elliptical through holes spaced apart along the length of the support plate.

[0032] The heat exchanger is equipped with an inlet pipe 6 and an outlet pipe 7 at its upper and lower ends. The welded joints of the inlet pipe 6 and outlet pipe 7 with the heat exchange tube 1 are significantly affected by vibration. Therefore, the tube holes 31 at the ends of the tube sheet 3 need to have a relatively large diameter to prevent the heat exchange tubes 1 at both ends from vibrating and colliding with the tube holes 31. Specifically, the diameter of the tube hole coaxially arranged with the outlet pipe 6 and inlet pipe 7 is larger than the diameter of the other tube holes.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A finned heat exchanger, comprising a plurality of heat exchange tubes, a plurality of fins, and a tube sheet, wherein the plurality of fins are arranged in parallel at intervals along the length direction of the heat exchange tubes, and a plurality of fixing holes are arranged at intervals on the fins, and the heat exchange tubes are inserted through the fixing holes; Its features are, The tube sheet is disposed at the outer end of a plurality of fins along the axial direction of the heat exchange tube. The tube sheet has tube holes at corresponding positions on the heat exchange tube. The tube holes are coaxially arranged with the heat exchange tube, and the diameter R1 of the tube holes is larger than the outer diameter R2 of the heat exchange tube.

2. The finned heat exchanger according to claim 1, characterized in that, The aperture R1 of the tube and the outer diameter R2 of the heat exchange tube satisfy the following relationship: 6mm ≥ R1 - R2 ≥ 3mm.

3. The finned heat exchanger according to claim 1, characterized in that, The finned heat exchanger also includes an inlet pipe and an outlet pipe. Some of the heat exchange pipes are connected to the inlet pipe or the outlet pipe. The diameter of the pipe hole coaxially arranged with the inlet pipe or the outlet pipe is larger than the diameter of the other pipe holes.

4. The finned heat exchanger according to claim 1, characterized in that, The tube hole is a through hole without flanges, and / or the fixing hole is a through hole with flanges.

5. The finned heat exchanger according to any one of claims 1-4, characterized in that, The finned heat exchanger also includes two end plates, which extend along the thickness direction of the tube sheet and are connected to the tube sheet. The end plates are disposed between the two tube sheets.

6. The finned heat exchanger according to claim 5, characterized in that, The tube sheet's projection along the length of the heat exchange tube completely covers the fins, and / or the end plate's projection along the spacing direction of the heat exchange tube completely covers the projected area of ​​the plurality of fins.

7. The finned heat exchanger according to claim 5, characterized in that, The finned heat exchanger also includes a support plate, the two ends of which are connected to the two end plates respectively.

8. The finned heat exchanger according to claim 7, characterized in that, The support plate is provided with multiple through holes, which are spaced apart along the length of the support plate.

9. The finned heat exchanger according to claim 7, characterized in that, The side of the support plate closest to the fin is in contact with the fin.

10. The finned heat exchanger according to claim 7, characterized in that, The tube sheet is provided with a first folded edge, which extends along the thickness direction of the tube sheet and has a fully penetrating fixing hole; and / or, the support plate is provided with a second folded edge, which extends along the thickness direction of the support plate and has a fully penetrating fixing hole; and / or, the end plate is provided with a third folded edge, which extends along the thickness direction of the end plate and has a fully penetrating fixing hole.

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