CN111912280A - Flat pipe, heat exchanger and heat pump water heater - Google Patents

Abstract

The invention provides a flat tube, a heat exchanger and a heat pump water heater. The flat tube includes a first metal sheet and a second metal sheet. The two sides corresponding to the first metal sheet and the second metal sheet are fixedly connected to form a guide channel, and the first metal sheet is a flat metal sheet. A thin plate, the second metal thin plate is provided with a protrusion protruding toward the first metal thin plate, and the top of the protrusion is fixedly connected to the first metal thin plate. Through the function of the first metal sheet, the contact area between the heat exchanger and the inner tank of the heat pump water heater can be greatly increased, and the working efficiency of the heat pump water heater can be improved. At the same time, since the second metal sheet of the flat tube in the present invention is provided with a protrusion, and the protrusion is fixedly connected with the second metal sheet, the structural strength of the flat tube in the present invention can be effectively improved, and the the service life of the flat tube.

Description

Flat tubes, heat exchangers and heat pump water heaters

technical field

The invention relates to the technical field of heat exchange devices, in particular to a flat tube, a heat exchanger and a heat pump water heater.

Background technique

At present, the flat tubes of heat exchangers in the prior art use porous micro-channel flat tubes (heat exchange tubes), which are produced by a hot extrusion process, all of which are linear structures with independent internal line holes.

In addition, the flat tube in the prior art is formed by stamping and tailor-welding two flat-shaped composite aluminum plates; and the welding edges of the two flat-shaped composite aluminum plates are straight welding There is no positioning structure in the middle of the composite board, and the structural strength is low.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a flat tube, a heat exchanger and a heat pump water heater to solve the problem of low strength of the flat tube in the prior art.

In order to achieve the above object, according to an aspect of the present invention, a flat tube is provided, comprising a first metal sheet and a second metal sheet, and the two sides corresponding to the first metal sheet and the second metal sheet are fixed After the connection, a diversion channel is formed, the first metal sheet is a flat metal sheet, the second metal sheet is provided with a protrusion that protrudes toward the first metal sheet, and the top of the protrusion is fixedly connected to the on the first metal sheet.

Further, the flat tube includes a middle pipe section and a constricted connecting section located at both ends of the middle pipe section, the width of the constricted connecting section is smaller than that of the middle pipe section, and the protrusion is located on the middle pipe section.

Further, an auxiliary positioning portion is provided at one end of the neck connecting section close to the middle pipe section.

Further, the second metal sheet is provided with a convex hull protruding toward the first metal thin plate at the position of the constricted connecting section, and the convex hull is fixedly connected to the first metal thin plate to form a Describe the auxiliary positioning part.

Further, the auxiliary positioning portion is in the form of a long strip, there are multiple auxiliary positioning parts, and the plurality of the long strip structures are arranged at intervals along the width direction of the neck connecting section.

Further, both the protrusion and the convex hull are fixedly connected to the first metal sheet by welding, and the welding area of the convex hull and the first metal sheet is larger than that of the protrusion and the first metal sheet. The welding area of the first metal sheet.

Further, two sides of the second metal sheet extending along the length direction are provided with beading bars, the beading bars are welded and fixed on the first metal sheet, and the side edges of the beading bars close to the center of the flat tube are concave and convex edges. , the side edge of the bead away from the center of the flat tube is a straight edge.

Further, the concave-convex edge is a serrated edge or a corrugated side edge.

According to another aspect of the present invention, a heat exchanger is provided, which includes a flat tube and a collecting tube, the flat tube is connected between the two collecting tubes, and the flat tube is the above-mentioned flat tube.

Further, the width direction of the flat tube is consistent with the length direction of the header, and the first metal sheet of the flat tube is located on the same side of the heat exchanger.

According to another aspect of the present invention, a heat pump water heater is provided, comprising a heat exchanger and an inner tank, the heat exchanger is the above-mentioned heat exchanger, and the first metal sheet of the heat exchanger is abutted against the inner tank. A tank is arranged, and a heat conduction structure is arranged between the first metal sheet and the inner tank.

Applying the technical solution of the present invention, since the flat tube in the present invention has a first metal sheet arranged in a flat plate shape, during actual installation, the width direction of the flat tube is consistent with the length direction of the header, and the first metal plate of the flat tube is The sheets are on the same side of the heat exchanger. When in use, the first metal sheet of the heat exchanger can be placed against the inner tank, and the contact area between the heat exchanger and the inner tank of the heat pump water heater in the present invention can be greatly improved by the action of the first metal sheet, thereby improving the The heat exchange efficiency between the heat exchanger and the inner tank in the present invention improves the working efficiency of the heat pump water heater. At the same time, since the second metal sheet of the flat tube in the present invention is provided with a protrusion, and the protrusion is fixedly connected with the second metal sheet, the structural strength of the flat tube in the present invention can be effectively improved, and the the service life of the flat tube.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

Figure 1 schematically shows an exploded view of the flat tube of the present invention;

Figure 2 schematically shows a perspective view of the flat tube of the present invention;

Fig. 3 schematically shows an enlarged view of the M region in Fig. 2;

Figure 4 schematically shows a front view of the flat tube of the present invention;

Fig. 5 schematically shows the A-A sectional view in Fig. 4 of the present invention;

Fig. 6 schematically shows the B-B and C-C cross-sectional views in Fig. 4 of the present invention;

FIG. 7 schematically shows the connection diagram of the flat tube and the header of the present invention;

FIG. 8 schematically shows an enlarged view of the N region in FIG. 7;

Figure 9 schematically shows a front view of the heat exchanger of the first embodiment of the present invention;

Figure 10 schematically shows a front view of a heat exchanger of a second embodiment of the present invention.

Wherein, the above-mentioned drawings include the following reference signs:

10, the first metal sheet; 20, the second metal sheet; 21, the protrusion; 22, the convex hull; 23, the bead; 24, the concave and convex edge; 25, the straight edge; , necked connecting section; 60, baffle; 70, collecting pipe; 80, outlet pipe; 90, inlet pipe; 100, bracket.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under other devices or constructions". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations and the spatially relative descriptions used herein interpreted accordingly.

1 to 10 , according to an embodiment of the present invention, a heat pump water heater is provided. Compared with coal-fired boilers and electric water heaters, the heat pump water heater in this embodiment is an environmentally friendly, High-efficiency, low-carbon new water heaters can improve the utilization rate of energy and facilitate the management of environmental pollution.

The heat pump water heater in this embodiment includes a heat exchanger and an inner tank. In actual use, the heat exchanger is arranged on the outer circumference of the inner tank to facilitate heat exchange with the inner tank to heat the liquid in the inner tank.

Specifically, the heat exchanger in this embodiment includes a baffle 60 , a header pipe 70 , a flat pipe, an outlet pipe 80 , an inlet pipe 90 and a bracket 100 .

Wherein, the flat tube is connected between the two header pipes 70, and the two ends of the flat tube are respectively connected with the header pipes 70, and the outlet pipe 80 and the inlet pipe 90 are respectively connected with the header pipes 70 at both ends of the flat pipe. A bracket 100 is provided on the tube 70 to facilitate the installation of the heat exchanger on the inner bladder. In actual design, the baffle 60 can be designed according to actual flow requirements.

In an embodiment of the present invention, there are a plurality of flat tubes, and the plurality of flat tubes are arranged along the length direction of the header 70. The heat exchanger further includes a partition plate 60, and the plurality of partition plates 60 are alternately arranged on two sides of the flat tube. On the header 70 at the end to connect a plurality of flat tubes in series, specifically, in this embodiment, the refrigerant needs to be arranged in a single series process in the heat exchanger. between the flat tubes. The staggered arrangement here means: if the flat tubes are numbered as one, two, three in the height direction of the heat exchanger, then the first separator 60 is arranged on the first header At the end position of the tube 70 located between the flat tube 1 and the flat tube 2, the second partition plate 60 is arranged at the end position of the second header 70 between the flat tube 2 and the flat tube 3 , the third partition plate 60 is arranged at the end position of the first header 70 between the flat tubes 3 and the flat tubes 4, and the fourth partition plate 60 is arranged at the second header 70 It is located at the end position between the flat tube 4 and the flat tube 5, and it can be circulated in sequence.

Of course, in other embodiments of the present invention, the outlet pipe 80 and the inlet pipe 90 may be connected to a header 70 at the same time, and as long as the deformations under the concept of the present invention are within the protection scope of the present invention Inside.

The flat tube in this embodiment includes a first metal sheet 10 and a second metal sheet 20. The two sides corresponding to the first metal sheet 10 and the second metal sheet 20 are fixedly connected to form a guide channel 30 for the circulation of the refrigerant. The first metal sheet 10 is a flat metal sheet, the second metal sheet 20 is provided with a protrusion 21 protruding toward the first metal sheet 10 , and the top of the protrusion 21 is fixedly connected to the first metal sheet 10 .

It can be seen that since the flat tube in this embodiment has the first metal sheet 10 arranged in a flat plate shape, during actual installation, the width direction of the flat tube is consistent with the length direction of the header 70, and the first metal sheet 10 of the flat tube on the same side of the heat exchanger. When in use, the first metal sheet 10 of the heat exchanger can be placed against the inner tank, and the contact area between the heat exchanger in this embodiment and the inner tank of the heat pump water heater can be greatly improved by the function of the first metal sheet 10 , thereby improving the heat exchange efficiency between the heat exchanger and the inner tank in this embodiment, and improving the working efficiency of the heat pump water heater. At the same time, since the second metal sheet 20 of the flat tube in this embodiment is provided with a protrusion 21, the protrusion 21 is fixedly connected to the second metal sheet 20, which can effectively improve the structure of the flat tube in this embodiment. strength, and improve the service life of the flat tube in this embodiment.

In this embodiment, the width direction of the flat tubes is the same as the length direction of the header 70. Under the same heat exchange area, the number of flat tubes in the heat exchanger can be significantly reduced, and less material is used, which is convenient to realize the light weight of the heat exchanger. quantify.

Preferably, the first metal sheet 10 and the second metal sheet 20 in this embodiment are both stamped from an aluminum sheet. During actual processing, the first metal sheet 10 and the second metal sheet 20 are tailor-welded to form a flat tube. It is easy to make a wider heat exchange plate. The currently used perforated flat tubes are usually less than 32 mm. The flat tubes in this embodiment are stamped and formed, which can easily reach more than 100 mm, which reduces the production cost of the heat exchanger. Of course, in other embodiments of the present invention, the first metal sheet 10 and the second metal sheet 20 can also be fixed together by means of dowels or screws, etc., as long as it is other deformation methods that can improve the structural strength of the flat tube, All fall within the protection scope of the present invention.

The flat pipe in this embodiment includes a middle pipe section 40 and a constricted connecting section 50 located at both ends of the central pipe section 40. The width of the constricted connecting section 50 is smaller than the width of the middle pipe section 40. The tube and the header 70 are connected together. Compared with the flat tube without the constricted connecting section 50 in the past, the flat tube structure in this embodiment can increase the flow rate of the refrigerant at the constricted connecting section 50. The actual design , the protrusion 21 in this embodiment is located on the middle pipe section 40, which is convenient to improve the overall structural strength of the flat pipe in this embodiment.

There are multiple protrusions 21 in this embodiment, and the protrusions 21 are arranged in a fish-scale shape. Compared with the cylindrically arranged structure, the structure of the fish-scale-shaped protrusions 21 in this embodiment is more compact and the space is more fully utilized. The structural strength of the flat tube can be further improved. In addition, the pressure angle in the incoming flow direction is small, which can reduce the flow resistance of the refrigerant, increase the primary heat exchange area, and strengthen the heat exchange. Through the action of the protrusions 21, the inner volume of the flat tube can also be made smaller, and the refrigerant charge amount can be reduced.

Preferably, an auxiliary positioning part is provided at one end of the necked connecting section 50 close to the middle pipe section 40 in this embodiment, and the auxiliary positioning part can play a role of local strengthening, and can ensure the end of the flat tube and the groove of the collecting pipe 70 The port collocation can withstand high pressure and meet the pressure resistance requirements of heat exchangers in the refrigeration industry.

In this embodiment, the second metal sheet 20 is provided with a convex hull 22 protruding toward the first metal thin plate 10 at the position of the constricted connecting section 50 , and the convex hull 22 is fixedly connected to the first metal thin plate 10 to form an auxiliary positioning portion , the structure is simple and easy to implement.

Preferably, the auxiliary positioning part has a long strip-shaped structure, and the number of auxiliary positioning parts is multiple, and the multiple strip-shaped structures are arranged at intervals along the width direction of the constricted connecting section 50, which can play a role of drainage, optimize the distribution of refrigerant inlets, and ensure refrigeration. The agent is evenly distributed in the longitudinal section of the flat tube, maximizing the use of the heat exchange area of the flat tube, thereby improving the heat exchange efficiency of the heat exchanger.

In an unshown embodiment of the present invention, the distance between the two auxiliary positioning parts of adjacent phases gradually widens from the direction close to the neck connecting section 50 to the middle pipe section 40, which facilitates uniform distribution of the refrigerant. Preferably, the connecting line of the end portions of the plurality of auxiliary positioning portions on the side close to the constriction connecting section 50 is arc-shaped, and the connecting line of the end portions on the side away from the constricting connecting section 50 is straight. Preferably, in other embodiments of the present invention, the plurality of elongated structures are arranged in a fan shape, so as to facilitate the uniform drainage of the refrigerant into the middle pipe section 40 .

In this embodiment, the protrusions 21 and the convex hulls 22 are both fixedly connected to the first metal sheet 10 by welding, and the welding area between the protrusions 21 and the first metal sheet 10 is larger than that between the protrusions 21 and the first metal sheet 10 . The welding area can effectively improve the structural strength of both ends of the flat tube and ensure the connection strength between the flat tube and the header 70 .

In this embodiment, two sides of the second metal sheet 20 extending in the length direction are provided with beading bars 23, the beading bars 23 are welded and fixed on the first metal sheet 10, and the side edges of the beading bars 23 close to the center of the flat tube are concave and convex edges 24. The side of 23 away from the center of the flat tube is a straight side 25 . Through the function of the bead 23 and the function of the concave-convex edge 24, it is convenient to increase the weldable area of the flat tube, ensure the sealing of the heat exchanger after the flat tube is welded, and at the same time play the role of strengthening the edge, which can significantly improve the flat tube itself and The pressure bearing capacity of the heat exchanger meets the pressure bearing requirements of the heat exchanger in the refrigeration industry. In addition, the design of the concave-convex edge 24 can also disturb the flow of the refrigerant in the flat tube.

Preferably, the concave-convex side 24 in this embodiment is a sawtooth side or a corrugated side, which is convenient to increase the weldable area of the flat tube, and has a simple structure and is easy to implement. Of course, in other embodiments of the present invention, the concave-convex side 24 can also be set as a combination of sawtooth side and corrugated side or other concave-convex side, as long as it is other deformation under the concept of the present invention, All fall within the protection scope of the present invention.

According to the above-mentioned embodiment, it can be known that the flat tube of the present invention is formed by tailor-welding the first metal sheet 10 and the second metal sheet 20, the second metal sheet 20 is formed by stamping, and a continuous and regular protrusion 21 is extruded in the middle. , a bead 23 is extruded from the edge, the first metal sheet 10 is a flat plate, the first metal sheet 10 and the second metal sheet 20 cooperate with each other and are brazed to form a flat tube described in this application, and a mesh is formed inside the flat tube The grid-shaped circulation cavity can be used for the circulation of the cooling medium, and because the protrusions 21 play a supporting and strengthening role, the flat tubes can withstand higher pressure. The two ends of the flat tube are the inlet and outlet of the refrigerant, and the convex hull 22 can be set to strengthen and drain the flow. In addition, the process partition 60 and the support 100 can be added as required.

During application and installation, the flat tube of the heat exchanger is wound on the inner tank of the water heater (the inner tank is a water storage container). The gap is filled to form a thermally conductive structure to improve the heat transfer efficiency.

When the heat pump water heater starts to work, the heat exchanger will act as the condenser, the medium is the refrigerant, and the refrigerant will release heat during the condensation process, transfer the heat to the inner tank and heat the water stored inside, so as to achieve the purpose of heating the water. In addition, when in use, the heat exchanger needs to withstand the working pressure of the refrigerant (for example: R22 does not exceed 3.0MPa, R410A does not exceed 4.5MPa), and usually requires a test pressure of 3 times the safety factor (for example: R22 is 9.0MPa, R410A is not more than 4.5MPa) 13.5MPa).

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

(1) The flat tube is stamped and welded from two composite aluminum sheets. The second metal sheet is punched out with regular middle protrusions and beads. The first metal sheet is a flat plate, and the two sheets are attached to each other. After welding, the middle bulge and bead of the second metal wall plate are completely welded with the first metal sheet, and the middle part forms a closed flow channel (except for the inlet and outlet). After the top bump is welded, it plays a sealing role;

(2) The inlet and outlet of the flat tube have a constricted connection section, which is used to match with the notch of the header and can play the role of assembly and positioning;

(3) Arbitrary process design is carried out through the partition, and the number and position of the partition can be flexibly adjusted according to the design needs;

(4) The outlet pipe and the inlet pipe can be flexibly arranged on the same side header or both side headers according to the installation needs, and the positions can be adjusted flexibly;

(5) During installation, the first metal sheet is in contact with the outer wall of the inner tank to increase the contact area, which can assist in filling the thermal conductive silica gel and increase the heat exchange efficiency.

(6) The end of the flat tube is provided with a long strip of large welding point, which can play a role of local strengthening, ensuring that the end of the flat tube and the notch of the collector pipe (usually the weak link) can withstand high pressure; the edge of the flat tube can withstand high pressure. The arc welding edge is set to increase the weldable area, ensure the sealing of the heat exchanger after welding, and at the same time play a role in strengthening the edge to meet the requirements of the refrigeration industry for the pressure resistance of the heat exchanger; long strip-shaped large welding point It can play the role of drainage, optimize the distribution of the refrigerant inlet, ensure that the refrigerant is evenly distributed in the longitudinal section of the flat tube, and maximize the use of the heat exchange area of the flat tube, thereby improving the heat exchange efficiency of the heat exchanger.

It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances such that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. A flat tube, characterized in that it comprises a first metal sheet (10) and a second metal sheet (20), wherein the first metal sheet (10) and the second metal sheet (20) correspond to A guide channel (30) is formed after the two sides are fixedly connected, the first metal sheet (10) is a flat metal sheet, and the second metal sheet (20) is provided with a direction facing the first metal sheet (10). ) protruding protrusions (21), the tops of the protrusions (21) are fixedly connected to the first metal sheet (10). 2. The flat tube according to claim 1, characterized in that, the flat tube comprises a middle tube section (40) and constricted connecting sections (50) located at both ends of the central tube section (40), the constricted connection The width of the section (50) is smaller than the width of the middle pipe section (40), and the protrusion (21) is located on the middle pipe section (40). 3. The flat tube according to claim 2, characterized in that, an auxiliary positioning portion is provided at one end of the necked connecting section (50) close to the middle tube section (40). 4 . The flat tube according to claim 3 , wherein the second metal sheet ( 20 ) is disposed at the position of the necked connecting section ( 50 ) facing the first metal sheet ( 10 ). 5 . A protruding convex hull (22), the convex hull (22) is fixedly connected on the first metal sheet (10) to form the auxiliary positioning portion. 5 . The flat tube according to claim 3 , wherein the auxiliary positioning portion is in the form of a long strip, the number of the auxiliary positioning parts is multiple, and the plurality of the long strip structures are connected along the constriction. 6 . The segments (50) are spaced apart in the width direction. 6 . The flat tube according to claim 4 , wherein the protrusion ( 21 ) and the convex hull ( 22 ) are fixedly connected to the first metal sheet ( 10 ) by welding, and The welding area between the convex hull (22) and the first metal sheet (10) is larger than the welding area between the protrusion (21) and the first metal sheet (10). 7. The flat tube according to any one of claims 1 to 6, characterized in that, beading bars (23) are provided on both sides of the second metal sheet (20) extending in the length direction, and the beading bars (23) ) is welded and fixed on the first metal sheet (10), and the side edge of the bead (23) close to the center of the flat tube is a concave-convex edge (24), and the bead (23) is far away from the center of the flat tube The sides of are straight edges (25). 8. The flat tube according to claim 7, wherein the concave-convex edge (24) is a serrated edge or a corrugated side edge. 9. A heat exchanger, comprising a flat tube and a collecting tube (70), wherein the flat tube is connected between two of the collecting tubes (70), characterized in that the flat tube is as claimed in claim 1 The flat tube described in any one of to 8. 10. The heat exchanger according to claim 9, characterized in that the width direction of the flat tube is consistent with the length direction of the header (70), and the first metal sheet (10 of the flat tube) ) on the same side of the heat exchanger. 11. The heat exchanger according to claim 9, characterized in that the heat exchanger further comprises an outlet pipe (80) and an inlet pipe (90), the outlet pipe (80) and the inlet pipe (90) ) are arranged on the same header (70) or are respectively arranged on the headers (70) at both ends of the flat tube. 12. The heat exchanger according to claim 9, characterized in that there are a plurality of the flat tubes, and the plurality of flat tubes are arranged along the length direction of the header (70), and the heat exchanger It also includes a separator (60), and a plurality of the separators (60) are arranged on the headers (70) at both ends of the flat tube in a staggered manner, so that the plurality of flat tubes are connected in series. 13. A heat pump water heater, comprising a heat exchanger and a liner, wherein the heat exchanger is the heat exchanger according to any one of claims 9 to 12, and the first metal of the heat exchanger is The thin plate (10) is arranged against the inner container, and a heat conduction structure is arranged between the first metal thin plate (10) and the inner container.

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