Elliptical tube heat exchanger

Abstract

The utility model discloses an elliptical tube heat exchanger, which is used in the field of cabinet air conditioners and the like, and comprises a plurality of elliptical tubes, a plurality of fins and a metal plate, as the air volume of the central part of a fan in the cabinet air conditioner is larger than that of two sides, the elliptical tubes are reasonably arranged at inclined angles, and the angles of the elliptical tubes at the upper and lower end parts are kept parallel to the air flow; air flow disturbance in a central area is enhanced, the air mixing degree between adjacent units of the oval pipe is improved, the consistency of the flow direction of air flow is kept, the performance of the heat exchanger is improved, and meanwhile the inclined oval pipe has better condensate water drainage performance compared with a horizontally-arranged oval pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to an elliptical tube heat exchanger. Background Art

[0002] The existing elliptical tube heat exchangers are widely used in air conditioner consoles. The air flow is driven by the fan in the console to achieve the heat exchange purpose. Compared with circular tubes, elliptical tubes can accommodate more pipe fittings in the same space, thus reducing the overall volume of the heat exchanger. However, due to the non-uniformity of the air flow field inside the console (the air volume is large in the center of the fan and gradually decreases on both sides), in the prior art, the elliptical tubes are horizontally arranged, that is, the major axis of the cross-section of the elliptical tube is parallel to the air flow direction, resulting in too fast detachment of the air flow in the central part, and limited air mixing degree between adjacent units of the elliptical tubes, which is not conducive to improving the heat exchange efficiency. Content of the Utility Model

[0003] To solve the above technical problems, the utility model provides an elliptical tube heat exchanger, which can effectively mix the air flow in the central part and improve the heat exchange efficiency.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An elliptical tube heat exchanger includes a plurality of elliptical tubes. The cross-section of the elliptical tube is elliptical. The elliptical tubes are arranged at intervals along the height direction of the heat exchanger and are staggered along the thickness direction of the heat exchanger. The included angle between the major axis direction of the cross-section of the elliptical tube and the air flow direction is θ. The included angle of at least one row of elliptical tubes at both ends in the height direction of the heat exchanger in each column is 0° or approaches 0°, and the range of the included angle θ of the remaining elliptical tubes is 5° - 20°.

[0006] It can be understood that since the air volume in the middle of the fan is greater than that on both sides, the inclination angle of the middle elliptical tubes is set, and the elliptical tubes at the upper and lower ends are arranged in parallel, which improves the disturbance and mixing degree of the air flow in the middle, and at the same time reduces the air resistance on the windward surface of the outer periphery, so that the air flow at the air outlet remains parallel, taking into account the characteristics of high heat transfer coefficient and low pressure drop.

[0007] Furthermore, the elliptical tube heat exchanger further includes a plurality of fins. The fins are arranged at intervals and in parallel along the length direction of the elliptical tubes. A plurality of elliptical holes are arranged at intervals on the fins for mating connection with the elliptical tubes.

[0008] It can be understood that by adding a plurality of fins arranged in parallel, the heat exchange area is increased and the heat exchange speed is improved.

[0009] Furthermore, sheet metals are respectively arranged on the outer sides of the fins at both ends and / or the upper and lower ends along the length direction of the elliptical tubes. The projections of the sheet metals along the length direction and / or the upper and lower ends of the elliptical tubes can wrap the fins, so as to reduce the collision and deformation of the fins and the elliptical tubes.

[0010] Further, the included angle θ of the elliptical tubes at both ends of the heat exchanger in the height direction in each column approaches 0° or is 0°, so as to constrain the flow direction of the air flow deflected by the elliptical tubes in the central part, comb the air flow, and make the overall air flow direction consistent with the axis of the wind tunnel.

[0011] Further, the included angle θ of the elliptical tubes in the middle row along the height direction of the heat exchanger in each column is the largest, and the included angle θ of the elliptical tubes decreases gradually along the height direction of the heat exchanger to both sides, and the included angle θ of the elliptical tubes at both ends approaches 0° or is 0°.

[0012] It can be understood that the included angle θ of the elliptical tubes decreases from the middle to both sides, which can more finely adjust the air flow velocity from the middle to both sides and improve the heat exchange efficiency.

[0013] Further, along the height direction of the heat exchanger, the distance between the adjacent two elliptical tubes in each column of elliptical tubes gradually decreases from the first row at both ends to the middle row, reducing the central air flow velocity and making the overall air flow at the air outlet uniform.

[0014] It can be understood that reducing the arrangement spacing of the middle elliptical tubes can increase the resistance of the air flow through, increase the gas disturbance; increasing the arrangement spacing of the elliptical tubes on both sides can reduce the air flow resistance and balance the overall air flow velocity; at the same time, according to the wind field distribution law, the wind speed and air volume in the middle are greater than those on both sides, which can improve the utilization rate of the wind field and strengthen the heat exchange.

[0015] For an elliptical tube heat exchanger of the present utility model, through reasonable arrangement of the inclination angles of the elliptical tubes and keeping the angles of the elliptical tubes at the upper and lower ends parallel to the air flow, it not only strengthens the air flow disturbance in the central area, improves the air mixing degree between adjacent units of the elliptical tubes, but also maintains the consistency of the air flow direction, improves the performance of the heat exchanger, and at the same time, the inclined elliptical tubes have better condensate drainage performance compared with the horizontally arranged elliptical tubes. Description of the Drawings

[0016] Figure 1 is a perspective view of the elliptical tube heat exchanger of the present utility model;

[0017] Figure 2 is Figure 1 a partial enlarged view of the place A in

[0018] Figure 3 is a side view of the elliptical tube heat exchanger of the present utility model;

[0019] Figure 4 is a front view of the elliptical tube heat exchanger with an included angle of 20 degrees of the present utility model;

[0020] Figure 5 is a front view of the elliptical tube heat exchanger with an included angle of 5 degrees of the present utility model;

[0021] Among them, 1 is an elliptical tube, 2 is a fin, 3 is sheet metal, 4 is a water inlet pipe, and 5 is a water outlet pipe. Specific implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] As Figures 1-5 shown, an elliptical tube heat exchanger includes a plurality of elliptical tubes 1, a water inlet pipe 4, and a water outlet pipe 5. The elliptical tube 1 is a thin-walled hollow structure. The elliptical tube 1 can be made of copper, and its cross-section is elliptical. The elliptical tubes 1 are arranged at intervals along the height direction of the heat exchanger, and each column of elliptical tubes is arranged staggeredly along the thickness direction of the heat exchanger. The upper and lower ends on one side of the heat exchanger are provided with a water inlet pipe 4 and a water outlet pipe 5. The water inlet pipe 4 and the water outlet pipe 5 are respectively in fluid communication with the elliptical tube 1, and the elliptical tubes 1 are in fluid communication with each other in sequence. A fan is arranged on one side of the heat exchanger, and the air flow passes through the gaps between the elliptical tubes 1 to achieve heat exchange. The included angle between the major axis direction of the cross-section of the elliptical tube 1 and the air flow direction is θ. The included angle θ1 of the elliptical tubes 1 at both ends in the height direction of the heat exchanger approaches 0°. When θ ≤ 2°, it can be considered to approach 0. In this embodiment, the major axis directions of the cross-sections of the elliptical tubes 1 at both ends are kept parallel to the air flow direction, and the range of the included angle θ of the remaining elliptical tubes 1 is 5° to 20°. As Figure 4 shown in [a certain figure], in one embodiment, the elliptical tubes 1 in the middle part adopt an included angle of 20°, which is suitable for the case where the central air flow velocity is much higher than that on both sides. At this time, the condensate drainage effect is better; as Figure 5 shown in [another figure], in another embodiment, an included angle of 5° is adopted, which is suitable for the case where the velocity difference is not large.

[0024] Through the above arrangement, the degree of disturbance and mixing of the central air flow is improved, and at the same time, the wind resistance of the windward surface of the outer periphery is reduced, so that the air flow at the outlet of the air outlet remains parallel, taking into account the characteristics of high heat transfer coefficient and low pressure drop. And due to the inclination angle of the central elliptical tubes, the condensate drainage effect of the heat exchanger is improved, which helps to reduce the fouling phenomenon.

[0025] Specifically, the heat exchanger further includes fins 2. The fins 2 are rectangular thin plates. The fins 2 are arranged at intervals and in parallel along the length direction of the elliptical tube 1. A plurality of elliptical holes are arranged at intervals in the length direction of the fins 2. There is at least one column of elliptical holes in the width direction of the fins 2. When there are multiple columns of elliptical holes, the heights between adjacent columns are different, forming a staggered arrangement. In this embodiment, three columns of elliptical holes are arranged for expansion connection with the elliptical tube 1.

[0026] Specifically, sheet metals 3 are respectively arranged on the outer sides of the fins 2 at both ends and / or upper and lower ends of the elliptical tube 1 in the length direction. The sheet metals 3 can be made of stainless steel. Elliptical holes are arranged on the sheet metals 3, and they are expanded and connected with the elliptical tube 1. Flanges are arranged on the four sides of the sheet metals 3, and the flanges can be folded inwards or outwards. The sheet metals at the upper and lower ends are screwed to the sheet metals in the length direction to form a protection frame. In this embodiment, the inward folding method is adopted; the projections of the sheet metals 3 along the length direction and / or upper and lower ends of the elliptical tube 1 can wrap the fins 2, thereby reducing the fins 2 and the elliptical tube 1 from being knocked and deformed.

[0027] Specifically, for each row of elliptical tubes, the included angle θ between the elliptical tubes 1 in the 1-3 rows at both ends in the height direction of the heat exchanger approaches 0° or is 0°. For example Figure 4 , in this embodiment, the included angle θ between the elliptical tubes 1 in the two rows at both ends approaches zero, so as to constrain the flow direction of the air flow deflected by the elliptical tubes 1 in the central part, reduce the wind resistance of the windward surfaces of the elliptical tubes at the upper and lower ends, sort out the air flow, and make the overall air flow direction consistent with the axis of the wind tunnel.

[0028] Specifically, for each row of elliptical tubes, the included angle θ of the elliptical tube 1 in the middle row along the height direction of the heat exchanger is the largest, and the included angle θ of the elliptical tube 1 decreases gradually from the middle row along the height direction of the heat exchanger to both sides, and the included angle θ of the elliptical tube 1 at both ends approaches 0° or is 0°. By more finely adjusting the included angles of each row of elliptical tubes, the overall air mixing degree is further improved, and the heat exchange efficiency is improved.

[0029] Specifically, along the height direction of the heat exchanger, the distance between the adjacent two elliptical tubes 1 in each row of elliptical tubes 1 gradually decreases from both ends to the middle, further strengthening the heat exchange, reducing the flow velocity of the central air flow, and making the overall air flow at the air outlet uniform.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elliptical tube heat exchanger, comprising a plurality of elliptical tubes; characterized in that, The cross-section of the elliptical tube is elliptical. The elliptical tubes are arranged at intervals along the height direction of the heat exchanger, and are staggered in the thickness direction of the heat exchanger between each row of elliptical tubes. The included angle between the major axis direction of the cross-section of the elliptical tube and the air flow direction is θ. The included angle of at least one row of elliptical tubes at both ends in the height direction of the heat exchanger in each row of elliptical tubes is 0° or approaches 0°, and the range of the included angle θ of the remaining elliptical tubes is 5° to 20°.

2. The elliptical tube heat exchanger according to claim 1, characterized in that, The elliptical tube heat exchanger further includes a plurality of fins. The fins are arranged in parallel at intervals along the length direction of the elliptical tube, and a plurality of elliptical holes are arranged at intervals on the fins for mating connection with the elliptical tubes.

3. The elliptical tube heat exchanger according to claim 2, wherein Sheet metals are respectively arranged on the outer sides of the fins at both ends and / or the upper and lower ends along the length direction of the elliptical tube. The projections of the sheet metals along the length direction and / or the upper and lower ends of the elliptical tube can wrap the fins.

4. An elliptical tube heat exchanger according to any one of claims 1-3, characterized in that, The included angle θ of the elliptical tubes in 1 to 3 rows at both ends in the height direction of the heat exchanger in each row of elliptical tubes approaches 0° or is 0°.

5. An elliptical tube heat exchanger according to any one of claims 1 to 3, characterized in that, The included angle θ of the elliptical tubes in the middle row in the height direction of the heat exchanger in each row of elliptical tubes is the largest. The included angle θ of the elliptical tubes decreases towards both ends along the height direction of the heat exchanger, and the included angle θ of the elliptical tubes at both ends approaches 0° or is 0°.

6. The elliptical tube heat exchanger according to claim 4, characterized in that, The included angle θ of the elliptical tubes in the middle row in the height direction of the heat exchanger in each row of elliptical tubes is the largest. The included angle θ of the elliptical tubes decreases towards both ends along the height direction of the heat exchanger, and the included angle θ of the elliptical tubes at both ends approaches 0° or is 0°.

7. An elliptical tube heat exchanger according to any one of claims 1-3 or 6, characterized in that, Along the height direction of the heat exchanger, the distance between the arrangement intervals of two adjacent elliptical tubes in each row of elliptical tubes gradually decreases from the first rows at both ends to the middle row.

8. The elliptical tube heat exchanger according to claim 4, wherein, Along the height direction of the heat exchanger, the distance between the arrangement intervals of two adjacent elliptical tubes in each row of elliptical tubes gradually decreases from the first rows at both ends to the middle row.

9. The elliptical tube heat exchanger according to claim 5, characterized in that, Along the height direction of the heat exchanger, the distance between the arrangement intervals of two adjacent elliptical tubes in each row of elliptical tubes gradually decreases from the first rows at both ends to the middle row.

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