CN114198910A - Heat exchange piece and heating appliance - Google Patents

Abstract

The invention relates to a heat exchange part, wherein a first heat exchange channel for a first heat exchange medium to pass through is formed in the heat exchange part, a second heat exchange channel for a second heat exchange medium to pass through is formed outside the heat exchange part, the heat exchange part further comprises raised heat exchange parts distributed along the axial direction of the first heat exchange channel, the raised heat exchange parts are arranged around the first heat exchange channel, the second heat exchange channel is formed between two adjacent raised heat exchange parts on one side back to the first heat exchange channel, the first heat exchange channel comprises a heat exchange cavity and a cooling cavity which are mutually communicated, the raised heat exchange parts are raised relative to the heat exchange cavity, and the cooling cavity is formed in the raised heat exchange parts. So, the heat transfer chamber is conducted with it rapidly behind the heat of protruding heat transfer portion is absorbed in the cooling chamber for protruding heat transfer portion cooling is faster and heat transfer effect is better, has avoided local high temperature damage phenomenon, has guaranteed heat transfer spare and even the reliability of product, has promoted heat transfer spare simultaneously and has even the heat transfer performance of product.

Description

Heat exchange piece and heating appliance

Technical Field

The invention relates to the technical field of heating, in particular to a heat exchange piece and a heating appliance.

Background

Most of the heat exchangers of the existing gas water heaters adopt a traditional finned tube structure heat exchanger, the basic heat transfer element of the finned tube heat exchanger is a finned tube, namely a unit for heat exchange consisting of a perforated fin and a tube, the process comprises the steps of penetrating the tube through holes in the fin, and then performing tube expansion process and welding step, wherein the perforated fin is formed by punching and processing a copper sheet or a stainless steel sheet (generally, a plurality of holes for the metal tube to penetrate through are punched on the metal sheet). And part of heat exchangers of the gas water heater are in a spiral finned tube form, fins of the heat exchangers are spirally wound around the heat exchange tubes and are welded and fixed between one edge of each tube and the wall of each tube, and the fins are made of copper strips or stainless steel strips.

Because each fin of the traditional fin tube type heat exchanger and the spiral fin tube type heat exchanger is made of sheet metal, in the working process, part of heat of high-temperature flue gas is transferred to the tube through the fin, and then is transferred to water in the tube through the tube, so that the water is heated. Referring to fig. 1, fig. 1 is a partial cross-sectional view of a conventional finned tube assembly, in which a finned tube 3 'includes a fin 31' and a tube body 32 'welded together, where the fin is located too far from the tube wall (e.g., a distance greater than or equal to L3' in fig. 1), the fin is susceptible to damage due to long-term heating by high-temperature flue gas due to untimely heat transfer, and in design applications, the fin portion too far from the tube wall is blanked to prevent overall damage and deformation, while for spiral fins, the fin end edge cannot be too far from the tube wall. In practical experience, the maximum distance between the stainless steel fins and the tube wall generally cannot exceed 2mm-3mm, and if the maximum distance is too large, the stainless steel fins are easy to burn out. Therefore, the heat exchange area of the heat exchange fins is not increased to improve the heat exchange strengthening effect. And the secondary heat exchange condensation effect is not facilitated, and the heat exchange efficiency is difficult to be greatly improved.

Disclosure of Invention

The present invention is directed to a heat exchanger that solves one or more of the problems set forth in the prior art, and provides at least one useful alternative or creation.

The technical problem is solved by the following technical scheme:

the utility model provides a heat transfer spare, be formed with the first heat transfer passageway that supplies first heat transfer medium to pass through within the heat transfer spare, be formed with the second heat transfer passageway that supplies second heat transfer medium to pass through outside the heat transfer spare, heat transfer spare still includes along the protruding heat transfer portion of first heat transfer passageway axial distribution, protruding heat transfer portion arranges around first heat transfer passageway, form second heat transfer passageway in one side of first heat transfer passageway dorsad between two adjacent protruding heat transfer portions, first heat transfer passageway includes heat transfer chamber and the cooling chamber that communicates each other, protruding heat transfer portion is protruding for the heat transfer chamber and the inside cooling chamber that forms of protruding heat transfer portion.

Compared with the background technology, the heat exchange piece of the invention has the following beneficial effects: because the inside cooling chamber that is formed with and heat transfer chamber intercommunication each other of protruding heat transfer portion, the heat that the cooling chamber absorbed the protruding heat transfer portion from the second heat transfer medium (wherein the second heat transfer medium can also flow in other places except that first heat transfer passageway except second heat transfer passageway) in time conducts to first heat transfer medium, and the first heat transfer medium in cooling chamber flows each other with the first heat transfer medium in heat transfer chamber and fuses, consequently, the heat in cooling chamber is also conducted the heat transfer chamber rapidly, make protruding heat transfer portion lower the temperature faster and heat transfer effect is better, local high temperature damage phenomenon has been avoided, the reliability of heat transfer spare even product has been guaranteed, heat transfer spare has promoted simultaneously and has even the heat transfer performance of product.

In one embodiment, the raised heat exchanging portion includes a first bending region and a second bending region connected to each other, and the first bending region is parallel to the second bending region. Because the first bending area and the second bending area of the raised heat exchange part are parallel to each other, the heat exchange part can be used for increasing the number of the raised heat exchange parts in a unit distance, and further increasing the contact area of the pipe wall and a second heat exchange medium.

In one embodiment, the first and second inflection zones are perpendicular to the axial direction of the first heat exchange channel. The first bending area and the second bending area are arranged in the axial direction perpendicular to the first heat exchange channel, so that the contact area of the pipe wall and the second heat exchange medium can be further increased, the distance between the plurality of heat exchange pieces during assembly can be reduced, and the assembly stability and the structure compactness can be improved.

In one embodiment, a gap with the size of L1 is formed between the first bending area and the second bending area of the same raised heat exchange part, and the value range of L1 is 0.5mm-3 mm; the height of the convex heat exchange part relative to the first heat exchange channel is L3, and the value range of L3 is not less than 2 mm. In order to realize better heat exchange effect, the size of the cooling cavity is limited, namely the size of a gap formed between two bending areas in the protruding heat exchange part is limited to be 0.5-3mm, and the height range of the protruding heat exchange part is not less than 2mm, so that the heat exchange effect can be improved.

In one embodiment, the distance between two adjacent raised heat exchanging portions is L2, and L2 ranges from 1.5mm to 3 mm. The size of the distance between the two convex heat exchanging parts is limited within the range of 1.5-3mm, so that the second heat exchanging medium passing through the second heat exchanging channel can smoothly circulate, and the flow speed is controlled within a reasonable range for ensuring heat exchange.

In one embodiment, the raised heat exchanging portion comprises a first bending region and a second bending region which are connected with each other, the first bending region and the second bending region are symmetrically arranged, and the distance between the first bending region and the second bending region of the same raised heat exchanging portion is gradually reduced in the direction away from the heat exchanging cavity. The cross section of the raised heat exchange part is similar to a conical surface in the axial direction along the first heat exchange channel, so that the second heat exchange channel is gradually increased in the direction far away from the heat exchange cavity, the second heat exchange medium is convenient to circulate along the raised heat exchange part and is close to the heat exchange cavity, and uniform heat exchange of each part of the heat exchange part is facilitated.

In one embodiment, the heat exchange part comprises a pipe wall, the pipe wall comprises a raised heat exchange part, and the pipe wall is integrally processed. The raised heat exchange part is formed by bending the pipe wall, so that the integration of the fins and the pipe body is realized, the problems of poor contact between the fins and the pipe and the like are avoided, the heat transfer effect is better, pipe expansion, welding and the like are not needed, the process is simple, the cost is low, the problem of water leakage is greatly improved because the welding between the fins and the pipe is not needed, the product percent of pass is improved, and the problems of complex welding process, higher requirement on welding, easy generation of lattice change, larger thermal resistance and the like of the spiral finned pipe are avoided. In addition, protruding heat transfer portion is by the pipe wall bending type one-tenth, realizes batchization and standardization more easily in the technology, also because standardized production can realize that fin and first heat transfer passageway (be inner tube passageway) distance are comparatively even, has further avoided local high temperature to damage the phenomenon, has guaranteed the reliability of heat transfer spare and even product. The heat exchange member may be a tube with seam (tube wall with seam extending along axial direction), or a tube without seam.

In one embodiment, the tube wall further comprises surrounding portions, the surrounding portions and the protruding heat exchange portions are arranged at intervals, the surrounding portions protrude towards the first heat exchange channels, and the inner surfaces of the surrounding portions are smooth. The setting closes the portion to the bellied enclosure of first heat transfer passageway, can realize the effect of vortex in first heat transfer passageway for promote the heat transfer effect.

In one embodiment, the tube wall is made of stainless steel. Stainless steel has stronger corrosion resistance, good ductility and heat exchange performance, and the integrated pipe wall of the protruding heat exchange part and the pipe body is manufactured by processing the stainless steel, so that the process standardization is easy to realize on the basis of ensuring the heat exchange performance, the stainless steel can be used for avoiding the condition of local overheating, the mass production is easy, and the processing cost is reduced.

The invention also provides a heating appliance comprising the heat exchange piece. The heating appliance can be a heat exchanger, can also be a water heater product, and particularly can comprise a gas water heater. Because the heat transfer part of the heating device is internally provided with the cooling cavity communicated with the heat transfer cavity, the cooling cavity can timely transfer the heat absorbed by the heat transfer part from the second heat transfer medium (wherein the second heat transfer medium can flow in other places except the first heat transfer channel) to the first heat transfer medium, and the first heat transfer medium in the cooling cavity and the first heat transfer medium in the heat transfer cavity flow and are fused with each other, so that the heat in the cooling cavity is also rapidly transferred to the heat transfer cavity, the cooling of the heat transfer part is quicker, the heat transfer effect of the heat transfer part is better, the local high-temperature damage phenomenon is avoided, the reliability of the heat transfer device is ensured, and the heat transfer performance of the heat transfer device is improved at the same time.

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 order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a partial cross-sectional view of a conventional finned tube assembly;

FIG. 2 is a schematic structural view of a heat exchange member in one embodiment;

FIG. 3 is an axial cross-sectional view of the heat exchange element shown in FIG. 2;

FIG. 4 is an enlarged view of section I of FIG. 3;

FIG. 5 is an axial cross-sectional view of another embodiment of a heat exchange element;

FIG. 6 is an enlarged view of the portion K of FIG. 5;

FIG. 7 is a schematic view of another embodiment of a heat exchange member;

FIG. 8 is an assembled view of the heat exchange element shown in FIG. 5;

FIG. 9 is a schematic structural view of a heating appliance in a further embodiment;

FIG. 10 is a thermal field analysis of a conventional fin;

FIG. 11 is a thermal field analysis of a control heat exchange element;

FIG. 12 is a thermal field analysis of a preferred parameter heat transfer element;

FIG. 13 is a thermal field analysis of another heat exchange element of preferred parameters.

Reference numerals:

1. a first heat exchange channel; 11. a heat exchange cavity; 12. a cooling cavity; 2. a second heat exchange channel; 3. a heat exchange member; 31. a raised heat exchanging portion; 311. a first bending region; 312. a second bending region; 32. a surrounding part; 33. a connecting portion; 4. connecting the elbow; 5. a water pipe joint; 6. a housing;

3', a finned tube; 31', fins; 32' and a tube body.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In an embodiment, referring to fig. 2 to 4, a heat exchange member 3 is provided, a first heat exchange channel 1 for a first heat exchange medium to pass through is formed in the heat exchange member 3, a second heat exchange channel 2 for a second heat exchange medium to pass through is formed outside the heat exchange member 3, the heat exchange member 3 further includes raised heat exchange portions 31 axially distributed along the first heat exchange channel 1, the raised heat exchange portions 31 are arranged around the first heat exchange channel 1, a second heat exchange channel 2 is formed between two adjacent raised heat exchange portions 31 on a side back to the first heat exchange channel 1, the first heat exchange channel 1 includes a heat exchange cavity 11 and a cooling cavity 12 which are communicated with each other, the raised heat exchange portions 31 are raised relative to the heat exchange cavity 11, and the cooling cavity 12 is formed inside the raised heat exchange portions 31. It should be noted that the second heat exchange medium can pass through the place other than the second heat exchange channels 2, for example, the top position of the raised heat exchange part 31; the first heat exchange medium may be water and the second heat exchange medium may be high temperature flue gas. Of course, the first heat exchange channel 1 may also be used for passing flue gas, i.e. the first heat exchange medium is high temperature flue gas, and the second heat exchange channel 2 is correspondingly set to be a water channel, i.e. the second heat exchange medium is water.

Further, the heat exchanging element 3 comprises a pipe wall, the pipe wall comprises a raised heat exchanging portion 31, a surrounding portion 32 and a connecting portion, the pipe wall is integrally processed, and the pipe wall can be made of stainless steel materials. Of course, the tube material used for the heat exchange member 3 may be a seamless tube or a seam tube, and the tube material is processed to form the raised heat exchange portion 31 and the enclosing portion 32; in addition, the heat exchanging element 3 may also be formed by welding several axial segments end to end, or by welding several circumferential segments (for example, the heat exchanging element 3 is formed by welding 2 semicircles). In the embodiment of integral process, the raised heat exchanging part 31 and the enclosing part 32 are formed by bending the tube wall, and the connecting parts are located at two ends of the heat exchanging part 3, so as to realize integration of the fins and the tube body, wherein the heat exchanging part 3 can be a seamed tube (the tube wall has a seam extending along the axial direction) or a seamless tube. The surrounding parts 32 and the protruding heat exchanging parts 31 are alternately arranged, the surrounding parts 32 protrude toward the first heat exchanging channel 1, and the inner surfaces of the surrounding parts 32 are smooth. When first heat transfer medium passes through, it can change first heat transfer medium's flow state to be the enclosing portion 32 of convex, has the vortex effect, destroys its boundary layer, makes first heat transfer medium radial temperature more even, effectively strengthens the heat transfer effect. Similarly, a turbulent flow convex ring is formed on the inner surface of the pipe wall, and the turbulent flow convex ring is an annular inner bulge and corresponds to the wave trough of the part connected with the convex heat exchanging part 31. Compared with the heat exchange tube of a common heat exchanger, the heat exchange tube adopts light tubes (the tubes are not deformed to realize turbulent flow), and the tube fins of the fins, the turbulent flow convex ring of the embodiment can change the state of water flow and perform turbulent flow when the water flow passes, so that a boundary layer is damaged, and the heat exchange efficiency is improved. The connecting portion can be used for connecting the heat exchanging element 3 with other components, for example, the connecting portion can be in the shape of a light pipe and is used for connecting two ends of the heat exchanging element 3 with a communicating device in the form of a bent pipe or a communicating convex hull.

The radial cross section of the first heat exchange channel 1 is circular, oval or other shapes, that is, the heat exchange member 3 can be a circular or oval pipe fitting processed to form a circle of a plurality of convex heat exchange portions 31 protruding outwards, the convex heat exchange portions 31 are part of the pipe wall, and can be simply understood as that the heat exchange member 3 is one or more heat exchange pipes, the pipe wall of the heat exchange pipe rotates along the axis of the heat exchange pipe to form an inner pipe channel which is the first heat exchange channel 1, the cross section of the convex heat exchange portion 31 in the axial direction of the heat exchange pipe is n-shaped, and is a wave crest, the adjacent portion is U-shaped, and is a wave trough, the cross section of the plurality of convex heat exchange portions 31 connected with the adjacent portion is connected with the n-shaped and U-shaped, and has convex-concave corrugated staggered arrangement. The heat exchange member 3 shown in the drawings is in a straight tube shape only for example, and in addition, the heat exchange member 3 may be arranged in a curved shape according to the use condition, such as a spiral coil. Further, the pipe wall is made of stainless steel materials through integral processing. Stainless steel has stronger corrosion resistance, good ductility and heat exchange performance, and the protruding heat exchange part 31 and the pipe wall integrated with the pipe body are manufactured by processing the stainless steel, so that the process standardization is easy to realize on the basis of ensuring the heat exchange performance, the stainless steel can be used for avoiding the condition of local overheating, the mass production is easy, and the processing cost is reduced. The raised heat exchanging part 31 is formed by bending the pipe wall, so that the integration of the fins and the pipe body is realized, the problems of poor contact between the fins and the pipe and the like are avoided, the heat transfer effect is better, the pipe expansion, welding and the like are not needed, the process is simple, the cost is low, the fins and the pipe are not needed to be welded, the water leakage problem is greatly improved, and the product percent of pass is improved.

Further, referring to fig. 4, the raised heat exchanging portion 31 includes a first bending region 311 and a second bending region 312 which are connected to each other, the cooling cavity 12 is formed between the first bending region 311 and the second bending region 312 of the same raised heat exchanging portion 31, the first bending region 311 is parallel to the second bending region 312, a gap with a size of L1 is formed between the first bending region 311 and the second bending region 312 of the same raised heat exchanging portion 31, a size of a gap between two adjacent raised heat exchanging portions 31 is L2, and a height of the raised heat exchanging portion 31 relative to the first heat exchanging channel 1 is L3. It is understood that the first bending region 311 and the second bending region 312 of the same raised heat exchanging portion 31 may also be connected by a curved surface, and the curved surface is located at the top end of the raised heat exchanging portion 31. Preferably, the first bending region 311 and the second bending region 312 may be disposed perpendicular to the axial direction of the first heat exchange channel 1. Since the first bending region 311 and the second bending region 312 of the convex heat exchanging portion 31 are parallel to each other, the number of the convex heat exchanging portions 31 per unit distance can be increased, and thus the contact area between the tube wall and the second heat exchanging medium is increased. Preferably, the first inflection zone 311 and the second inflection zone 312 are perpendicular to the axial direction of the first heat exchange channel 1. The first bending region 311 and the second bending region 312 are perpendicular to the axial direction of the first heat exchange channel 1, on one hand, the contact area between the tube wall and the second heat exchange medium can be further increased, on the other hand, the distance between the plurality of heat exchange members 3 during assembly can be reduced, the assembly stability and the structural compactness can be increased, and if the thickness of the convex heat exchange portions 31 is adapted to the gap between the convex heat exchange portions 31, the convex heat exchange portion 31 of one heat exchange member 3 can be embedded into the gap between two convex heat exchange portions 31 of the adjacent heat exchange member 3 as required. Of course, the two bent regions of the raised heat exchanging portion 31 may also be non-perpendicular to the axial direction of the first heat exchanging channel 1, for example, the raised heat exchanging portion 31 is inclined toward the same direction relative to the first heat exchanging channel 1, so that the same fin height may have a larger heat exchanging area contacting the second heat exchanging medium, so that the structure is more compact on the same heat exchanging level.

Preferably, when the value range of L1 is 0.5mm-3mm, the value range of L3 is not less than 2mm, and the heat exchange effect can be improved. More preferably, when the first heat exchange medium is water and the second heat exchange medium is high-temperature flue gas, the value of L1 is set to be about 1.2mm, the value of L3 is set to be about 4mm-7mm, and the temperature of the tail end of the convex heat exchange portion 31 is appropriate and the heat exchange effect is good. And the value range of L2 can be set to 1.5mm to 3 mm. Specifically, the second heat exchange medium may be high-temperature flue gas, the high-temperature flue gas exchanges heat with the raised heat exchange portion 31, heat is transferred to the cooling cavity 12 of the first heat exchange channel 1 through the pipe wall where the raised heat exchange portion 31 is located, so that the temperature of water in the cooling cavity 12 is increased and circulates with the heat exchange cavity 11, thereby achieving a heat exchange effect, and meanwhile, the cooling cavity 12 may also timely cool the raised heat exchange portion 31, especially the tail end of the raised heat exchange portion 31. Referring to fig. 10 to 13, fig. 10 is a thermal field analysis diagram of a conventional fin (a single-piece one-piece fin), in which it can be seen that the temperature of the portion of the fin far from the heat exchange tube is as high as 500-; fig. 11 shows a thermal field analysis diagram of a control group of heat exchange members, where the selected size parameters of the heat exchange member 3 are L1-0.4 mm, L2-2.0 mm, and L3-5 mm, and a simulation result shows that the temperature of the tail end of the convex heat exchange portion 31 heated by high-temperature flue gas is as high as 500 ℃, because the L1 tank is too small, water in the L1 tank does not easily flow, and the heated water is not easily transferred to the heat exchange channel, so that the temperature of the tail end of the convex heat exchange portion 31 is too high; fig. 12 is a thermal field analysis diagram of a heat exchanger with a preferred parameter of one, where the size parameters of the heat exchanger 3 are selected to be L1-1.2 mm, L2-2 mm, and L3-5 mm, and L1-0.3.5 mm are used for simulation, along with the increase of L1, the heat exchange power per unit heat exchange area gradually increases, and when the size of the heat exchanger approaches 3mm, the heat exchange power per unit heat exchange area begins to decrease, and both the heat exchange effect and the local high temperature of the comparison group two are due to the comparison group one; fig. 13 shows a thermal field analysis diagram of another heat exchanger with preferred parameters, where the size parameters of the heat exchanger 3 are selected as L1-1.2 mm, L2-2 mm, and L3-7 mm, the temperature of the fin tip edge portion is 214 ℃, and is much lower than the temperature 500 ℃ of L3-5 mm in comparison with L1-0.4, and it also illustrates that in the case where the cooling cavity 12 in the raised heat exchanging portion 31 is large, the temperature of the fin tip edge portion is not too high due to an appropriate increase in the value of L3 of the height of the raised heat exchanging portion 31. That is, the cooling chamber 12 can effectively reduce the temperature at the end of the raised heat exchanging portion 31, and the fin height (L3) can be properly increased to increase the heat exchanging area of the fins, thereby achieving the effect of heat exchange enhancement. Wherein, the simulated heat sources in fig. 10 to 13 are all positioned below the heat exchange member 3. In addition, the value of L2 of the second heat exchange channel 2 is too large, the distance between the surrounding parts is too wide, the protrusion tends to be gentle, which is not beneficial to disturbing the water in the first heat exchange channel 1 and improving the heat exchange effect, and the contact area between the flue gas in the second heat exchange channel 2 and the protrusion heat exchange part 31 is reduced due to the too large value of L2, which is not beneficial to strengthening heat exchange; similarly, L2 is too small, the distance between the surrounding parts is too narrow, the protrusion is too small and dense, and the heat exchange effect is not favorably improved. The simulation study is carried out by taking L2 as 0.5-4.0mm, the heat exchange power per unit heat exchange area is gradually increased along with the increase of L2, and the heat exchange power per unit heat exchange area is reduced when the heat exchange area is close to 4mm, so that L2 is preferably 1.5-3.0 mm.

As another embodiment of the raised heat exchanging portion, the first bending region and the second bending region may also be in a non-parallel relationship, please refer to fig. 5 and 6, the raised heat exchanging portion 31 includes a first bending region 311 and a second bending region 312 connected to each other, the first bending region 311 and the second bending region 312 are symmetrically disposed, and a distance between the first bending region 311 and the second bending region 312 of the same raised heat exchanging portion 31 is gradually reduced in a direction away from the heat exchanging cavity 11. It can be understood that the cross section of the raised heat exchanging portion 31 in the axial direction of the first heat exchanging channel is similar to a conical surface, so that the second heat exchanging channel 2 is gradually increased in the direction away from the heat exchanging cavity 11, that is, the cooling cavity 12 is gradually increased and the second heat exchanging channel 2 is gradually decreased in the direction from the tail end to the root of the raised heat exchanging portion 31, which is convenient for the second heat exchanging medium to flow along the raised heat exchanging portion 31 and close to the heat exchanging cavity 11, and is beneficial to the uniform heat exchange of each part of the heat exchanging member 3.

In another embodiment, referring to fig. 7 and 8, the heat exchange member 3 may be formed by combining a plurality of tubes, and may include a single-row tube or a double-row tube, that is, may be formed by arranging at least one layer of heat exchange tubes, or may be formed by arranging two or more layers of heat exchange tubes in a staggered manner, and has a water inlet end and a water outlet end, the heat exchange tubes are connected end to form a complete water path, and the flue gas flows between the fins to exchange heat with water. Wherein a first heat exchange channel 1 is formed inside the pipe body formed by surrounding the pipe wall for passing water, and a second heat exchange channel 2 is formed between the protruded heat exchange parts 31 outside the pipe body for passing flue gas, wherein the flow of the second heat exchange channel 2 is shown in fig. 7. Wherein the heat exchange member 3 can be connected with a water pipe joint 5 to communicate with other pipelines. The pipe body has a certain expansion coefficient after water is frozen and expanded, can axially expand and rebound after ice is dissolved, and reduces the risk of frost cracking. In practical application, the heat exchange element 3 can be made into different shapes according to different requirements, and the surface of the heat exchange element is composed of a corrugated shape and has certain bending capacity, so that the pipe body can be made into a straight shape or a spiral shape or other shapes.

In yet another embodiment, referring to fig. 9, a heating appliance may be a heat exchanger, which includes the heat exchange element 3 of the above-described embodiment. The heating appliance comprises a shell 6, a connecting elbow 4, a water pipe connector 5 and the like, the heat exchange piece 3 is arranged in the shell 6, a water channel inside the heat exchange piece 3 is connected and circulated through the connecting elbow (here, the water channel can also be communicated through a communicating device in a protruding form, such as a communicating convex hull arranged on the shell 6), and the water channel of the heat exchange piece 3 and other pipelines is communicated through the water pipe connector 5.

In addition, the heater can also be a water heater product, and specifically can include a gas water heater, wherein the first heat transfer medium is water, and the second heat transfer medium is flue gas, and the flue gas is the water heating that the pipe wall 3 inner chamber of heat transfer piece 3 flows through.

In a traditional tube fin type structure heat exchanger, a plurality of holes are punched on each integrated fin, a heat exchange tube penetrates through the holes on the fins, then the tube is attached to the wall of the hole through a tube expansion process, finally, solder is put into a furnace for welding, and the phenomena of poor contact between the tube wall and the hole and the like can exist. When the water heater is used, the fins of the water heater are contacted with high-temperature flue gas for heat exchange, and heat is transferred to the heat exchange tubes and then transferred to water in the tubes. When the high-temperature flue gas reaches 1200 ℃, if the distance between part of the fins and the wall of the heat exchange tube is too large, the problem of local high temperature and even damage can be caused. In particular, the heat exchanger with the traditional tube fin type structure manufactured by stainless steel often has the problems of complex manufacturing process, high welding cost, high failure rate and the like. The novel spiral finned tube has the advantages of more complex welding process, higher welding requirement, easy generation of lattice change, larger thermal resistance and the like. Due to the limitation of the heat exchange coefficient of stainless steel, the height of the fin of the spiral finned tube from the tube wall cannot be too high, and the fin is easily burnt by high-temperature flue gas, so that the contact area of the fin and the flue gas is increased with certain difficulty, and the heat exchange efficiency is difficult to improve.

In this embodiment, the protruding heat exchanging portion 31 of the heat exchanging member 3 of the heating device and the pipe are integrally formed, a cooling cavity 12 communicated with the heat exchanging cavity 11 is formed in the protruding heat exchanging portion 31, the cooling cavity 12 timely conducts heat absorbed by the protruding heat exchanging portion 31 from a second heat exchanging medium (wherein the second heat exchanging medium can also flow in other places except the first heat exchanging channel 1 except the second heat exchanging channel 2) to a first heat exchanging medium, and the first heat exchanging medium of the cooling cavity 12 and the first heat exchanging medium of the heat exchanging cavity 11 flow and fuse with each other, so that the heat of the cooling cavity 12 is also quickly conducted to the heat exchanging cavity 11, so that the protruding heat exchanging portion 31 is cooled more quickly and the heat transfer effect is better, the local high-temperature damage phenomenon is avoided, the reliability of the heat exchanging device is ensured, and the heat exchanging performance of the heat exchanging device is improved at the same time. In addition, because the fin completely avoids the problem of welding clearance between the fin and the tube body, the problems of poor contact between the fin and the tube and the like are avoided, the heat transfer effect is better, tube expansion, welding and the like are not needed, the process is simple, the cost is low, the problem of water leakage is greatly improved because the welding between the fin and the tube is not needed, and the product percent of pass is improved. In addition, because the distance between the heat exchanging part and the first heat exchanging channel 11 is uniform, the phenomenon of local high-temperature damage is avoided.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A heat exchange member, a first heat exchange channel (1) for a first heat exchange medium to pass through is formed in the heat exchange member (3), a second heat exchange channel (2) for a second heat exchange medium to pass through is formed outside the heat exchange piece (3), characterized in that the heat exchange part (3) also comprises a raised heat exchange part (31) which is axially distributed along the first heat exchange channel (1), the raised heat exchanging parts (31) are arranged around the first heat exchanging channel (1), the second heat exchanging channel (2) is formed between two adjacent raised heat exchanging parts (31) at one side back to the first heat exchanging channel (1), the first heat exchange channel (1) comprises a heat exchange cavity (11) and a cooling cavity (12) which are communicated with each other, the raised heat exchanging part (31) protrudes relative to the heat exchanging cavity (11) and the cooling cavity (12) is formed inside the raised heat exchanging part (31).

2. A heat exchange member according to claim 1, wherein the raised heat exchange portion (31) comprises a first bending region (311) and a second bending region (312) which are connected with each other, and the first bending region (311) is parallel to the second bending region (312).

3. A heat exchange element according to claim 2, characterized in that the first and second inflection zones (311, 312) are perpendicular to the axial direction of the first heat exchange channel (1).

4. The heat exchange element according to claim 2, wherein a gap with a size of L1 is formed between the first bending region (311) and the second bending region (312) of the same raised heat exchange part (31), and a value of L1 is in a range of 0.5mm-3 mm; the height of the protrusion heat exchange part (31) relative to the protrusion of the first heat exchange channel (1) is L3, and the value range of L3 is not less than 2 mm.

5. The heat exchange member according to claim 2, wherein the maximum distance between two adjacent raised heat exchange portions (31) is L2, and L2 has a value ranging from 1.5mm to 3 mm.

6. A heat exchange member according to claim 1, wherein the raised heat exchange portion (31) comprises a first bending region (311) and a second bending region (312) which are connected with each other, the first bending region (311) and the second bending region (312) are symmetrically arranged, and the distance between the first bending region (311) and the second bending region (312) of the same raised heat exchange portion (31) is gradually reduced in the direction away from the heat exchange cavity (11).

7. A heat exchanger according to any of claims 1-6, wherein the heat exchanger (3) comprises a tube wall, which comprises the raised heat exchanging portion (31), and which is made in one piece.

8. A heat exchange element according to claim 7, wherein the tube wall further comprises enclosing parts (32), the enclosing parts (32) are arranged alternately with the raised heat exchange parts (31), the enclosing parts (32) are raised towards the first heat exchange channel (1), and the inner surfaces of the enclosing parts (32) are rounded.

9. The heat exchange element of claim 7 wherein said tube wall is formed of a stainless steel material.

10. A heating appliance, characterized in that it comprises a heat exchange element (3) according to any one of claims 1 to 9.

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