Flat tube and heat exchanger

Some embodiments of the present disclosure provide a flat tube and a heat exchanger. The flat tube includes a middle tube segment and necking connection segments located at two ends of the middle tube segment, wherein a width of each of the necking connection segments is less than a width of the middle tube segment, a transition connection segment is provided between the each of the necking connection segments and the middle tube segment, and the transition connection segment is provided with a fastening and positioning part.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure is a national stage application of International Patent Application No. PCT/CN2019/113741, which is filed on Oct. 28, 2019, and claims priority to Chinese Patent Application No. 201811604190.2, filed on Dec. 26, 2018 and entitled “Flat Tube and Heat Exchanger”, the contents of which are hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a technical field of heat exchange devices, and in particular, to a flat tube and a heat exchanger.

BACKGROUND

Currently, a bump structure is provided in a flat tube of a heat exchanger known to inventors, and the bump structure has a certain turbulence effect on a fluid medium in the flat tube.

The flat tube known to inventors is formed by stamping and butt welding of two composite aluminum plates; the flat tube is necked, which significantly reduces a size of a header, reduces a internal volume of the heat exchanger, and reduces a filling of a refrigerant; there is no large welding spot to reinforce a port, and a strength of a straight welding edge is weak; and a welding spot in a middle portion is further optimized, so as to improve a strength and a heat exchange efficiency.

SUMMARY

The main object of the present disclosure is to provide a flat tube and a heat exchanger, so as to solve a problem of a low strength of flat tubes known to inventors.

In order to achieve the described object, some embodiments of the present disclosure provide a flat tube. The flat tube includes a middle tube segment and necking connection segments located at two ends of the middle tube segment, wherein a width of each of the necking connection segments is less than the width of the middle tube segment, a transition connection segment is provided between the each of the necking connection segments and the middle tube segment, and the transition connection segment is provided with fastening and positioning parts.

In some embodiments, the flat tube includes two metal sheets, and the fastening and positioning part is formed by welding the two metal sheets.

In some embodiments, the fastening and positioning part is formed by welding bumps of the two metal sheets.

In some embodiments, the fastening and positioning part has a long strip-shaped structure, there are a plurality of the fastening and positioning parts, and the plurality of the fastening and positioning parts are arranged at an interval in a width direction of the transition connection segment.

In some embodiments, a distance between two adjacent fastening and positioning parts in the plurality of the fastening and positioning parts gradually widens in a direction from being the each of the necking connection segments to the middle tube segment.

In some embodiments, a connecting line of end portions of the plurality of fastening and positioning parts on a side close to the each of the necking connection segments is of an arc, and a connecting line of end portions on a side away from the each of the necking connection segments is a straight line.

In some embodiments, the two metal sheets are both provided with protrusions protruding towards each other, tops of the protrusions on the two metal sheets are welded and fixed to form an auxiliary connection part, and the protrusions are all located on the middle tube segment.

In some embodiments, a welding area of the fastening and positioning part is larger than a welding area of the tops of the protrusions.

In some embodiments, there are a plurality of the protrusions, and the plurality of protrusions are arranged in a fish scale shape.

In some embodiments, depression bars are provided on two sides of the metal sheets extending in a length direction, the two metal sheets are welded and fixed together by means of the depression bars, a side edge of each depression bar close to the center of the flat tube is a concave-convex edge, and a side edge of the each depression bar away from the center of the flat tube is a straight edge.

In some embodiments, the concave-convex edge is a serrated edge or a corrugated side edge.

Some embodiments of the present disclosure provide a heat exchanger, including a flat tube, wherein the flat tube is the flat tube described above.

By applying the technical solution of the present disclosure, since the transition connection segment of the flat tube in the present disclosure is provided with fastening and positioning part, the fastening and positioning part achieves a effect of local reinforcement, so that it is ensured that a joint between an end portion of the flat tube and a header slot withstands a high pressure, satisfying a pressure resistance requirement of heat exchangers in the refrigeration industry.

Wherein the drawings include the following reference signs:10. middle tube segment;20. necking connection segment;21. protrusion;30. transition connection segment;31. fastening and positioning part;40. depression bar;41. concave-convex edge;42. straight side; and50. collecting pipe.

DETAILED DESCRIPTION OF THE EMBODIMENTS

It should be noted that the embodiments and the features in the embodiments of the present disclosure can be combined without conflicts. The present disclosure will be described below with reference to the drawings and embodiments in detail.

It should be noted that the terminologies used herein are for the purpose of describing the embodiments only and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, it should also be understood that the terminologies “include” and/or “comprise” when used in the present description indicate the presence of features, steps, operations, devices, components and/or a combination thereof.

Referring toFIG.1toFIG.6, according to an embodiment of the present disclosure, some embodiments of the present disclosure provide a heat exchanger. The heat exchanger includes flat tubes and collecting pipes50, wherein the plurality of flat tubes are arranged side by side, and two ends of each flat tube are connected with the collecting pipes50respectively.

In order to improve a structural stability of a flat tube, the structure of the flat tube is improved in the present embodiment. The flat tube includes a middle tube segment10and necking connection segments20located at two ends of the middle tube segment10, wherein a width of each of the necking connection segments20is less than the width of the middle tube segment10, a transition connection segment30is provided between the each of the necking connection segments20and the middle tube segment10, and the transition connection segment30is provided with a fastening and positioning part31.

Since the transition connection segment30of the flat tube in the present embodiment is provided with the fastening and positioning part31, the fastening and positioning part31can achieve the effect of local reinforcement, so that it can be ensured that a joint between an end portion of the flat tube and a slot of collecting pipe50can withstand a high pressure, satisfying a pressure resistance requirement of heat exchangers in the refrigeration industry.

The flat tube in the present embodiment includes two metal sheets, and the fastening and positioning part31is formed by welding the two metal sheets. Certainly, in other embodiments of the present disclosure, the two metal sheets are fixed together by means of pins or screws, and other variations as long as capable of improving a structural strength of the transition connection segment30all fall within a scope of protection of the present disclosure. Ins some embodiments, the fastening and positioning part31in the present embodiment is formed by welding bumps of the metal sheets, which have a simple structure and are easy to implement.

In the present embodiment, depression bars40are provided on two side edges of the two metal sheets extending in a length direction, correspondingly, the depression bars40of the two metal sheets are welded and fixed together, a side edge of each depression bar40close to the center of the flat tube is a concave-convex edge41, and a side edge of the each depression bar40away from the center of the flat tube is a straight edge42. Under an effect of the depression bars40and an effect of the concave-convex edge41, an increasing of a weldable area of the flat tube is facilitated, the sealing performance of the heat exchanger after the welding of the flat tube is ensured, and the effect of reinforcing the edge portion is also achieved, so that the pressure bearing capabilities of the flat tube itself and the heat exchanger can be significantly improved, satisfying the pressure resistance requirement of heat exchangers in the refrigeration industry. In addition, a design of the concave-convex edge41can also realize the turbulence purpose for the refrigerant in the flat tube.

In some embodiments, the concave-convex edge41in the present embodiment is a serrated side edge or a corrugated side edge, which facilitates increasing the weldable area of the flat tube, and is simple in structure and easy to implement. Certainly, in other embodiments of the present disclosure, the concave-convex edge41is configured to be a combination of the serrated side edge and the corrugated side edge or other concave-convex side edge, and other variations as long as under the concept of the present disclosure all fall within the scope of protection of the present disclosure.

In the present embodiment, the two metal sheets are both provided with protrusions21protruding towards each other, tops of the protrusions21on the two metal sheets are welded and fixed to form an auxiliary connection part, and the protrusions21are all located on the middle tube segment10. Under the effect of the auxiliary connection part, the structural stability of the flat tube in the present embodiment can be further improved, and it is ensured that the flat tube can satisfy the pressure bearing requirement of heat exchangers.

A welding area of the fastening and positioning parts31in the present embodiment is greater than a welding area of the tops of the protrusions21, which can effectively improve the structural strength of the two ends of the flat tube and ensure the connection strength between the flat tube and the collecting pipe50.

In some embodiments, the fastening and positioning parts31in the present embodiment have a long strip-shaped structure, there are a plurality of the fastening and positioning parts31, and the plurality of the fastening and positioning parts31are arranged at an interval in a width direction of the transition connection segment30, which can achieve a flow guide effect, optimize the distribution of refrigerant inlets, ensure that the refrigerant is uniformly distributed in the longitudinal section of the flat tube, and utilize the heat exchange area of the flat tube to the maximum extent, thereby improving the heat exchange efficiency of the heat exchanger.

A distance between two adjacent fastening and positioning parts31in the plurality of the fastening and positioning parts gradually widens in a direction from being the each of the necking connection segments20to the middle tube segment10, facilitating the uniform distribution of the refrigerant. In an embodiment of the present disclosure, a connecting line of end portions of the plurality of fastening and positioning parts31on a side close to the each of the necking connection segments20is of an arc, and a connecting line of end portions on a side away from the each of the necking connection segments20is a straight line.

In some embodiments, in other embodiments of the present disclosure, a plurality of long strip-shaped structures are arranged in a fan shape, facilitating guiding the refrigerant uniformly into the middle tube segment10.

Referring toFIG.1toFIG.4, there are a plurality of the protrusions21in the present embodiment, and the plurality of protrusions21are arranged in a fish scale shape. Compared with a circularly arranged structure, the plurality of protrusions21arranged in a fish scale shape in the present embodiment have a more compact structure, utilize the space more sufficiently, and can further improve the structural strength of the flat tube. In addition, the pressure angle in an inflow direction is small, so that the flowing resistance of the refrigerant can be reduced, and the primary heat exchange area is increased, so that the heat exchange can be enhanced.

From the description above, it can be determined that the embodiments above of the present disclosure achieve the following technical effects:the end portion of the flat tube in the present disclosure is provided with waist-shaped large welding spots, which can achieve the effect of local reinforcement, so that it is ensured that the joint (usually a weak link) between the end portion of the flat tube and a collecting pipe slot can withstand a high pressure; the edge portion of the flat tube is provided with a concave-convex edge, which can increase the welding area, and ensure the sealing performance of the heat exchanger after welding, and also have the effect of reinforcing the edge portion, so that the pressure bearing capabilities of the flat tube itself and the heat exchanger can be significantly improved, satisfying the pressure resistance requirement 13.5 MPa of heat exchangers in the refrigeration industry;in addition, the waist-shaped large spots can achieve a flow guide effect, optimize the distribution of refrigerant inlets, ensure that the refrigerant is uniformly distributed in the longitudinal section of the flat tube, and utilize the heat exchange area of the flat tube to the maximum extent, thereby improving the heat exchange efficiency of the heat exchanger;the protrusions in the middle portion of the flat tube have a bionic structure (fish scale shape), and compared with the prior art (circular welding spot), the welding spots are arranged more compactly, the space is utilized more sufficiently, and the strength can be improved; furthermore, the pressure angle in an inflow direction is small, so that the flowing resistance of the refrigerant can be reduced; and the heat exchange area can be increased, so that the heat exchange can be enhanced.

The foregoing descriptions are merely preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made in line with the spirit and principle of the present disclosure shall be included in the scope of protection of the present disclosure.