CN111912280A

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

Info

Publication number: CN111912280A
Application number: CN201910384789.8A
Authority: CN
Inventors: 魏文建; 马文勇
Original assignee: Zhejiang Dunan Thermal Technology Co Ltd
Current assignee: Zhejiang Dunan Thermal Technology Co Ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-11-10

Abstract

The invention provides a flat pipe, a heat exchanger and a heat pump water heater. The flat pipe comprises a first metal thin plate and a second metal thin plate, a flow guide channel is formed after the first metal thin plate and the two corresponding side edges of the second metal thin plate are fixedly connected, the first metal thin plate is a flat-plate-shaped metal thin plate, the second metal thin plate is provided with a direction, the first metal thin plate is convex, and the top of the second metal thin plate is fixedly connected to the first metal thin plate. Through the effect of first sheet metal, can improve the area of contact of heat exchanger and heat pump water heater's inner bag greatly, improve heat pump water heater's work efficiency. Meanwhile, the second metal sheet of the flat tube is provided with the bulge which is fixedly connected with the second metal sheet, so that the structural strength of the flat tube can be effectively improved, and the service life of the flat tube is prolonged.

Description

Flat pipe, heat exchanger and heat pump water heater

Technical Field

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

Background

At present, a heat exchanger flat tube in the prior art adopts a porous micro-channel flat tube (heat exchange tube), the flat tube is produced by a hot extrusion process, the flat tube is of a linear structure, and inner wire holes are mutually independent.

In addition, the flat pipe in the prior art is formed by stamping and welding two flat composite aluminum plates; and the welding edges of the two flat-plate-shaped composite aluminum plates are straight welding edges, the strength of the straight welding edges is weaker, no positioning structure is arranged in the middle of the flat-plate-shaped composite plate, and the structural strength is lower.

Disclosure of Invention

The invention mainly aims to provide a flat pipe, a heat exchanger and a heat pump water heater, and aims to solve the problem that the flat pipe in the prior art is low in strength.

In order to achieve the above object, according to one aspect of the present invention, a flat tube is provided, which includes a first metal thin plate and a second metal thin plate, two corresponding sides of the first metal thin plate and the second metal thin plate are fixedly connected to form a flow guide channel, the first metal thin plate is a flat metal thin plate, a protrusion protruding toward the first metal thin plate is disposed on the second metal thin plate, and a top of the protrusion is fixedly connected to the first metal thin plate.

Furthermore, the flat pipe comprises a middle pipe section and necking connecting sections positioned at two ends of the middle pipe section, the width of each necking connecting section is smaller than that of the middle pipe section, and the protrusions are positioned on the middle pipe section.

Furthermore, one end of the necking connecting section, which is close to the middle pipe section, is provided with an auxiliary positioning part.

Furthermore, a convex hull protruding towards the first metal sheet is arranged at the position, located at the necking connecting section, of the second metal sheet, and the convex hull is fixedly connected to the first metal sheet to form the auxiliary positioning portion.

Furthermore, the auxiliary positioning part is of a long strip-shaped structure, the auxiliary positioning parts are multiple, and the long strip-shaped structures are arranged at intervals in the width direction of the necking connecting section.

Furthermore, the protrusion and the convex hull are fixedly connected to the first metal sheet in a welding mode, 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.

Furthermore, pressing strips are arranged on two sides, extending along the length direction, of the second metal thin plate, the pressing strips are welded and fixed on the first metal thin plate, the side, close to the center of the flat pipe, of each pressing strip is a concave-convex edge, and the side, far away from the center of the flat pipe, of each pressing strip is a straight line edge.

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

According to another aspect of the invention, a heat exchanger is provided, which includes a flat pipe and a collecting pipe, wherein the flat pipe is connected between the two collecting pipes, and the flat pipe is the above flat pipe.

Further, the width direction of the flat pipe is consistent with the length direction of the collecting pipe, and the first metal thin plate of the flat pipe is located on the same side of the heat exchanger.

According to another aspect of the invention, a heat pump water heater is provided, which comprises a heat exchanger and an inner container, wherein the heat exchanger is the heat exchanger, a first metal sheet of the heat exchanger is arranged by being attached to the inner container, and a heat conduction structure is arranged between the first metal sheet and the inner container.

By applying the technical scheme of the invention, because the flat tube is provided with the first metal thin plate which is arranged in a flat plate shape, the width direction of the flat tube is consistent with the length direction of the collecting pipe during actual installation, and the first metal thin plate of the flat tube is positioned at the same side of the heat exchanger. When the heat exchanger is used, the first metal sheet of the heat exchanger can be arranged by being attached to the inner container, and the contact area between the heat exchanger and the inner container of the heat pump water heater can be greatly increased under the action of the first metal sheet, so that the heat exchange efficiency between the heat exchanger and the inner container is improved, and the working efficiency of the heat pump water heater is improved. Meanwhile, the second metal sheet of the flat tube is provided with the bulge which is fixedly connected with the second metal sheet, so that the structural strength of the flat tube can be effectively improved, and the service life of the flat tube is prolonged.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 schematically shows an exploded view of a flat tube according to the invention;

fig. 2 shows a schematic perspective view of a flat tube according to the invention;

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

fig. 4 shows a schematic front view of a flat tube according to the invention;

FIG. 5 schematically illustrates a cross-sectional view A-A of FIG. 4 of the present invention;

FIG. 6 schematically illustrates cross-sectional views B-B and C-C of FIG. 4 of the present invention;

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

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

fig. 9 schematically shows a front view of a heat exchanger of a first embodiment of the invention;

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

Wherein the figures include the following reference numerals:

10. a first metal thin plate; 20. a second metal thin plate; 21. a protrusion; 22. a convex hull; 23. layering; 24. concave-convex edges; 25. a straight line edge; 30. a flow guide channel; 40. a middle pipe section; 50. a necking connection section; 60. a partition plate; 70. a header pipe; 80. an outlet pipe; 90. an inlet pipe; 100. and (4) a bracket.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the 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 a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Referring to fig. 1 to 10, according to an embodiment of the present invention, a heat pump water heater is provided, and compared with a coal-fired boiler and an electric water heater, the heat pump water heater in the embodiment is a novel water heater which is environment-friendly, efficient, and low-carbon, and can improve the utilization rate of energy sources and facilitate the treatment of environmental pollution.

The heat pump water heater in this embodiment includes heat exchanger and inner bag, and during the in-service use, the heat exchanger setting is in the periphery of inner bag, is convenient for carry out the heat transfer with the inner bag in order to heat the liquid in the inner bag.

Specifically, the heat exchanger in the present embodiment includes a partition plate 60, a header 70, flat tubes, an outlet tube 80, an inlet tube 90, and a bracket 100.

The flat pipes are connected between the two collecting pipes 70, two ends of each flat pipe are respectively connected with the collecting pipes 70, the outlet pipe 80 and the inlet pipe 90 are respectively connected with the collecting pipes 70 at two ends of each flat pipe, and the collecting pipes 70 are provided with the supports 100, so that the heat exchanger can be conveniently installed on the inner container. In actual design, the baffle 60 may be designed according to actual flow requirements.

In an embodiment of the present invention, the number of the flat tubes is multiple, the multiple flat tubes are arranged along the length direction of the header pipe 70, the heat exchanger further includes a partition plate 60, and the multiple partition plates 60 are alternately arranged on the header pipes 70 at two ends of the flat tubes to enable the multiple flat tubes to be connected in series. The staggered arrangement here means: if the flat pipes are numbered as one, two and three in the height direction of the heat exchanger, a first partition plate 60 is arranged at the end position, located between the first flat pipe and the second flat pipe, of the first collecting pipe 70, a second partition plate 60 is arranged at the end position, located between the second flat pipe and the third flat pipe, of the second collecting pipe 70, a third partition plate 60 is arranged at the end position, located between the third flat pipe and the fourth flat pipe, of the first collecting pipe 70, and a fourth partition plate 60 is arranged at the end position, located between the fourth flat pipe and the fifth flat pipe, of the second collecting pipe 70, and the steps are sequentially repeated.

Of course, in other embodiments of the present invention, the outlet tube 80 and the inlet tube 90 may be connected to a single manifold 70, and any modification within the spirit of the present invention is within the scope of the present invention.

The flat tube in this embodiment includes a first metal thin plate 10 and a second metal thin plate 20, two corresponding sides of the first metal thin plate 10 and the second metal thin plate 20 are fixedly connected to form a flow guide channel 30 for a cooling medium to flow through, the first metal thin plate 10 is a flat metal thin plate, a protrusion 21 protruding toward the first metal thin plate 10 is disposed on the second metal thin plate 20, and a top of the protrusion 21 is fixedly connected to the first metal thin plate 10.

It can be seen that, because the flat tube in this embodiment has the first metal sheet 10 in a flat plate shape, during actual installation, the width direction of the flat tube is the same as the length direction of the header pipe 70, and the first metal sheet 10 of the flat tube is located on the same side of the heat exchanger. During the use, can make the first sheet metal 10 of heat exchanger paste and lean on the inner bag setting, through the effect of this first sheet metal 10, can improve the area of contact of the heat exchanger in this embodiment and the inner bag of heat pump water heater greatly, and then improve the heat exchange efficiency of heat exchanger and inner bag in this embodiment, improve heat pump water heater's work efficiency. Meanwhile, because the second metal sheet 20 of the flat pipe in the embodiment is provided with the protrusion 21, the protrusion 21 is fixedly connected with the second metal sheet 20, the structural strength of the flat pipe in the embodiment can be effectively improved, and the service life of the flat pipe in the embodiment is prolonged.

Make the width direction of flat pipe unanimous with the length direction of pressure manifold 70 in this embodiment, under the same heat transfer area, the flat pipe quantity of heat exchanger can obviously reduce, uses the material still less, is convenient for realize the lightweight of heat exchanger.

Preferably, the first metal thin plate 10 and the second metal thin plate 20 in this embodiment are both formed by punching an aluminum plate, and during actual processing, the first metal thin plate 10 and the second metal thin plate 20 are tailor-welded to form flat tubes, which is easier to manufacture wider heat exchange plates, and the currently used porous flat tubes are usually below 32mm, and the flat tubes in this embodiment are formed by punching, which easily achieves more than 100mm, and reduces the production cost of the heat exchanger. Of course, in other embodiments of the present invention, the first thin metal plate 10 and the second thin metal plate 20 may be fixed together by means of pins, screws, or the like, and any other modification that can improve the structural strength of the flat tube is within the scope of the present invention.

The flat pipe in this embodiment includes middle part pipeline section 40 and the throat linkage segment 50 that is located middle part pipeline section 40 both ends, the width of throat linkage segment 50 is less than the width of middle part pipeline section 40, effect through throat linkage segment 50, be convenient for link together flat pipe and pressure manifold 70, flat pipe structure in this embodiment can be in the throat linkage segment 50 and increase the velocity of flow of refrigerant, in the time of actual design, arch 21 in this embodiment is located middle part pipeline section 40, be convenient for improve the overall structure intensity of the flat pipe in this embodiment.

The arch 21 in this embodiment is a plurality of, and arch 21 is the fish scale shape and arranges, compares in the structure of cylindrical arrangement, and the structure of the arch 21 that the fish scale shape was arranged is compacter in this embodiment, and the space utilization is more abundant, can further improve the structural strength of flat pipe, and in addition, incoming flow direction pressure angle is little, can reduce the flow resistance of refrigerant, increases heat transfer area once, can strengthen the heat transfer. Through the effect of protruding 21, can also make flat pipe inner volume littleer, reduce the refrigerant volume of filling.

Preferably, the one end that the throat linkage segment 50 is close to middle part pipeline section 40 in this embodiment is provided with auxiliary positioning portion, can play the effect of local reinforcement through this auxiliary positioning portion, can guarantee that flat tub of tip portion and collecting pipe 70 notch collocation department can bear the high pressure, satisfies the withstand voltage demand of refrigeration trade heat exchanger.

In the embodiment, the convex hulls 22 protruding toward the first metal sheet 10 are arranged at the positions of the second metal sheet 20 located at the necking connecting sections 50, and the convex hulls 22 are fixedly connected to the first metal sheet 10 to form the auxiliary positioning portions.

Preferably, supplementary location portion becomes long strip structure, and supplementary location portion is a plurality of, and a plurality of strip structure are arranged along the width direction interval of throat linkage section 50, can play the drainage effect, optimize the refrigerant entry distribution, ensure that the refrigerant distributes uniformly in the longitudinal section of flat pipe, furthest utilizes the heat transfer area of flat pipe to improve the heat exchange efficiency of heat exchanger.

In an embodiment of the present invention, which is not shown, the distance between two adjacent sub-positioning portions gradually increases from the direction near the necking connecting section 50 to the middle pipe section 40, so as to facilitate uniform distribution of the refrigerant. Preferably, the connection line of the end portions of the plurality of auxiliary positioning portions on the side close to the throat connecting section 50 is arc-shaped, and the connection line of the end portions on the side far from the throat connecting section 50 is straight. Preferably, in other embodiments of the present invention, the plurality of elongated structures are arranged in a fan shape to facilitate uniform flow of refrigerant into the middle tube section 40.

Protruding 21 and convex closure 22 in this embodiment all through welding mode fixed connection on first sheet metal 10, and the welding area of convex closure 22 and first sheet metal 10 is greater than the welding area of protruding 21 and first sheet metal 10, can effectively improve the structural strength at flat pipe both ends, guarantees flat pipe and pressure manifold 70's joint strength.

The two sides of the second metal sheet 20 extending along the length direction in the embodiment are provided with pressing strips 23, the pressing strips 23 are welded and fixed on the first metal sheet 10, the side of the pressing strip 23 close to the center of the flat tube is a concave-convex edge 24, and the side of the pressing strip 23 far away from the center of the flat tube is a straight line edge 25. Through the effect of layering 23, through the effect of concave-convex edge 24, be convenient for increase the area that can weld of flat pipe, guarantee flat tub of welding back heat exchanger's leakproofness, play the effect that limit portion is reinforceed simultaneously, can show the bearing capacity who improves flat pipe self and heat exchanger, satisfy the withstand voltage demand of refrigeration trade heat exchanger. In addition, the design of the concave-convex edge 24 can also play a role in disturbing the refrigerant in the flat pipe.

Preferably, the concave-convex edge 24 in this embodiment is a sawtooth side edge or a corrugated side edge, which is convenient for increasing the welding area of the flat tube, and has a simple structure and is convenient for implementation. Of course, in other embodiments of the present invention, the concave-convex edge 24 may be a combination of a sawtooth side and a corrugated side or other concave-convex side, and any other modifications under the concept of the present invention are within the protection scope of the present invention.

According to the above embodiments, the flat tube of the present invention is formed by welding the first thin metal plate 10 and the second thin metal plate 20, the second thin metal plate 20 is formed by stamping, the continuous and regular protrusions 21 are pressed at the middle part, the bead 23 is pressed at the edge part, the first thin metal plate 10 is a flat plate, the first thin metal plate 10 and the second thin metal plate 20 are matched with each other and brazed into a whole to form the flat tube described in the present application, a latticed flow cavity is formed inside the flat tube for the circulation of the refrigerant medium, and the flat tube can bear higher pressure due to the supporting and strengthening effects of the protrusions 21. The two ends of the flat pipe are provided with a refrigerant inlet and a refrigerant outlet, the convex hulls 22 can be arranged to play a role in strengthening and drainage, the end parts can slightly take the necking connecting sections 50, the structure is matched with the notches of the collecting pipe 70, the assembling and positioning effects are played, and in addition, the flow partition plates 60 and the support 100 can be added according to needs.

When the heat exchanger is applied and installed, the flat tube of the heat exchanger is wound on the inner container of the water heater (the inner container is a water storage container), in order to overcome the gap caused by incomplete contact of the heat exchange tube and the barrel wall and eliminate air thermal resistance, the gap can be filled with heat-conducting silica gel, so that a heat-conducting structure is formed, and the heat transfer efficiency is improved.

When the heat pump water heater is started to work, the heat exchanger serves as a condenser, the medium is a refrigerant, the refrigerant releases heat in the condensation process, heat is transferred to the inner container, the water stored in the inner container is heated, and the purpose of heating the water is achieved. In addition, the heat exchanger is required to bear the working pressure of the refrigerant (for example, R22 is not more than 3.0MPa, R410A is not more than 4.5MPa) when in use, and the test pressure is required to be 3 times of the safety factor (for example, R22 is 9.0MPa, and R410A is 13.5 MPa).

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

(1) the flat pipe is formed by stamping and tailor-welding two composite aluminum plates, a middle bulge and a pressing strip with a certain rule are stamped on a second metal thin plate, a first metal thin plate is a flat plate, the two plate sheets are mutually attached, the middle bulge and the pressing strip of the brazed second metal wall plate are completely welded with the first metal thin plate, a closed flow channel (an inlet except an outlet) is formed in the middle, the middle bulge plays a role in mechanical strengthening and heat exchange strengthening, and the edge bulge plays a role in sealing after welding;

(2) the inlet and the outlet of the flat pipe are provided with necking connecting sections which are used for being matched with the notch of the collecting pipe and can play a role in assembling and positioning;

(3) any flow design is carried out through the partition plates, and the number and the positions of the partition plates can be flexibly adjusted according to the design requirement;

(4) the outlet pipe and the inlet pipe can be flexibly arranged on the collecting pipe at the same side or two sides according to the installation requirement, and the positions can be flexibly adjusted;

(5) during installation, the first metal sheet is in contact with the outer wall of the inner container, so that the contact area is increased, heat-conducting silica gel can be filled in an auxiliary mode, and the heat exchange efficiency is increased.

(6) The end part of the flat tube is provided with a strip-shaped large welding spot, so that the local strengthening effect can be achieved, and the matching part (usually a weak link) of the end part of the flat tube and the notch of the current collecting tube can bear high pressure; the edge part of the flat tube is provided with an arc-shaped welding edge, so that the weldable area is increased, the sealing performance of the welded heat exchanger is ensured, and the edge part strengthening function is realized to meet the pressure-resistant requirement of the refrigeration industry on the heat exchanger; the strip-shaped large welding points can play a role in drainage, the distribution of the refrigerant inlet is optimized, the refrigerant is uniformly distributed in the longitudinal section of the flat pipe, and the heat exchange area of the flat pipe is utilized to the maximum extent, so that the heat exchange efficiency of the heat exchanger is improved.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a flat pipe, its characterized in that includes first sheet metal (10) and second sheet metal (20), first sheet metal (10) with form water conservancy diversion passageway (30) behind the corresponding both sides limit fixed connection of second sheet metal (20), first sheet metal (10) are flat sheet metal, be provided with the orientation on second sheet metal (20) first sheet metal (10) convex arch (21), the top fixed connection of arch (21) is in on first sheet metal (10).

2. Flat tube according to claim 1, characterised in that it comprises a middle tube section (40) and a reduced connection section (50) at both ends of the middle tube section (40), the reduced connection section (50) having a smaller width than the middle tube section (40), the protrusion (21) being located on the middle tube section (40).

3. Flat tube according to claim 2, characterised in that the end of the neck connecting section (50) close to the middle tube section (40) is provided with an additional positioning.

4. Flat tube according to claim 3, characterised in that the second metal sheet (20) is provided at the location of the neck connecting section (50) with a convex bulge (22) projecting towards the first metal sheet (10), the convex bulge (22) being fixedly connected to the first metal sheet (10) to form the additional detent.

5. The flat tube according to claim 3, wherein the auxiliary positioning portion is in an elongated structure, and the auxiliary positioning portion is in a plurality of elongated structures, and the elongated structures are arranged at intervals in the width direction of the necking connection section (50).

6. Flat tube according to claim 4, characterised in that the projections (21) and the bulges (22) are fixedly connected to the first metal sheet (10) by welding, and the welding area of the bulges (22) to the first metal sheet (10) is greater than the welding area of the projections (21) to the first metal sheet (10).

7. The flat tube according to any one of claims 1 to 6, wherein two sides of the second metal sheet (20) extending along the length direction are provided with pressing strips (23), the pressing strips (23) are welded and fixed on the first metal sheet (10), the side of the pressing strips (23) close to the center of the flat tube is a concave-convex edge (24), and the side of the pressing strips (23) far away from the center of the flat tube is a linear edge (25).

8. Flat tube according to claim 7, characterised in that the relief (24) is a serrated edge or a corrugated side edge.

9. A heat exchanger comprising flat tubes and header pipes (70), said flat tubes being connected between two of said header pipes (70), characterized in that said flat tubes are flat tubes according to any one of claims 1 to 8.

10. The heat exchanger according to claim 9, characterized in that the width direction of the flat tubes corresponds to the length direction of the header (70), and the first metal sheets (10) of the flat tubes are located on the same side of the heat exchanger.

11. The heat exchanger according to claim 9, further comprising an outlet pipe (80) and an inlet pipe (90), wherein the outlet pipe (80) and the inlet pipe (90) are disposed on the same header (70) or on the header (70) at two ends of the flat pipe respectively.

12. The heat exchanger according to claim 9, wherein the number of the flat tubes is plural, the plural flat tubes are arranged along a length direction of the header pipe (70), the heat exchanger further comprises a partition plate (60), and the plural partition plates (60) are arranged on the header pipe (70) at two ends of the flat tubes in a staggered manner so as to enable the plural flat tubes to be communicated in series.

13. A heat pump water heater comprises a heat exchanger and an inner container, and is characterized in that the heat exchanger is the heat exchanger as claimed in any one of claims 9 to 12, a first metal sheet (10) of the heat exchanger is arranged by being attached to the inner container, and a heat conduction structure is arranged between the first metal sheet (10) and the inner container.