CN214148359U - Heat exchange device and gas water heater - Google Patents

Abstract

The utility model relates to a heat exchange device, including casing and heat transfer spare, be formed with the heat transfer chamber in the casing, heat transfer spare holding in the heat transfer chamber, the inside first heat transfer passageway that supplies first heat transfer medium to pass through that is formed with of heat transfer spare, heat transfer spare surface is equipped with protruding heat transfer portion, protruding heat transfer portion alternate segregation between two heat transfer spares, the casing is formed with the supporting part in one side towards the heat transfer chamber, the supporting part is arranged along the length direction of heat transfer spare, the supporting part produces the holding power to at least partial heat transfer spare. So, protruding heat transfer portion alternate segregation between two heat transfer pieces adopts the fin design of non-one-piece formula promptly, can be used for reducing the mould expense to set up the supporting part at the casing, can provide the holding power for heat transfer piece, thereby increase the assembly reliability of heat exchanger and guarantee heat transfer performance.

Description

Heat exchange device and gas water heater

Technical Field

The utility model relates to a heating technology field especially relates to heat transfer device and gas heater.

Background

The heat exchange fins of the finned tube heat exchanger used for the gas water heater in the current market are made of copper plates or stainless steel plates by stamping. And a multi-hole design is adopted, namely a plurality of holes are punched on the plate to form a piece of fin, and a plurality of heat exchange tubes penetrate through the plurality of holes of the piece of fin to be assembled and fixed. The fin tube type heat exchanger is partially made of stainless steel materials, and welding between the heat exchange tube and the heat exchange fins generally adopts welding rods or welding paste which are put into a welding furnace after assembly. The stainless steel material heat transfer coefficient is less, need to cut off a large amount of stainless steel material that the heat exchanger fin kept away from the heat transfer pipe wall, reduces local high temperature region.

The heat exchange fins with the porous design are punched by copper plates or stainless steel plates, and if the distance between adjacent heat exchange tubes needs to be adjusted according to actual conditions, the heat exchange fins need to be subjected to die change or die sinking again, a large amount of die cost needs to be wasted, and the modularized design and the standardization of products are not facilitated. In addition, the heat exchange tube in the middle of the welded heat exchange piece of the one-piece fin is shielded by the peripheral heat exchange tube, so that whether the welding defects exist between the heat exchange tube in the middle and the heat exchange piece or not can not be directly detected by a simple method, the production efficiency is influenced, and the qualification rate of finished products is influenced. How to develop a better heat exchange device based on the purposes of saving cost and improving production efficiency is an important research direction.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a heat transfer device to solve one or more technical problem that exist among the prior art, provide a profitable selection or create the condition at least.

The technical problem is solved by the following technical scheme:

the utility model provides a heat exchange device, including casing and heat transfer spare, be formed with the heat transfer chamber in the casing, heat transfer spare holding in the heat transfer chamber, the inside first heat transfer passageway that supplies first heat transfer medium to pass through that is formed with of heat transfer spare, heat transfer spare surface is equipped with protruding heat transfer portion, protruding heat transfer portion looks alternate segregation between two heat transfer spares, the casing is formed with the supporting part in one side towards the heat transfer chamber, the supporting part is arranged along the length direction of heat transfer spare, the supporting part produces the holding power to at least some heat transfer spare.

The utility model discloses a heat transfer spare compares produced beneficial effect with the background art: because the raised heat exchange parts between the two heat exchange pieces are separated from each other, namely, the design of the non-one-piece type fins is adopted, the method can be used for reducing the cost of a die (the heat exchange pieces are easy to realize standardization) and avoiding the waste of materials (the fins are not needed to be punched out due to local high-temperature damage), and the processing and detection of a single heat exchange piece are facilitated because the local high-temperature areas of the heat exchange pieces are reduced, thereby being more beneficial to the size structure design and adjustment of the heat exchanger and the expansion of products in the later period. And the non-one-piece fin is difficult to play the effect of further fixing the heat exchange piece, and the heat exchange piece is out of shape (if the pipeline section is in the place of keeping away from with casing connection tip probably crooked downwards) probably appears in production or use, leads to the assembly reliability of heat exchanger to receive the influence, be unfavorable for the heat transfer, consequently sets up the supporting part at the casing, can provide the holding power for the heat exchange piece to increase the assembly reliability of heat exchanger and guarantee heat transfer performance.

In one embodiment, the supporting portion is strip-shaped, the length direction of the supporting portion is parallel to the length direction of the heat exchange member, the supporting portion is provided with a flow guide surface, and the flow guide surface is inclined towards the middle of the heat exchange cavity in the main flow direction of the second heat exchange medium. Because the heat transfer piece is in the use, water is passed through in the first heat transfer passageway, can lead to the fact the impact to the pipe wall when water pressure is undulant and produce stress, cause the surge, seriously produce shake become curved deformation etc. and the gravity of water itself can also lead to the fact the pipe to become curved deformation, and the supporting part extends the setting on a parallel with heat transfer piece length direction, can provide better bearing for the heat transfer piece, in addition, the supporting part forms the water conservancy diversion face, can be with the flue gas drainage to the heat transfer piece that is located heat transfer chamber middle part.

In one embodiment, the housing is provided with insulation for reducing heat transfer from the heat exchange chamber to a space outside the housing. Because the integral type fin among the prior art welds with the lateral wall of casing, has the effect of evenly conducting the heat exchange tube from the casing lateral wall with the heat, and this embodiment adopts independent fin, is equipped with protruding heat transfer portion promptly on heat transfer member surface, weakens with the heat-conduction of casing lateral wall, sets up heat-insulating portion in the casing and realizes keeping warm to the heat transfer chamber on the one hand, reduces the heat and looses outward, and on the other hand makes the overheated condition can not appear on the casing surface, reduces the inconvenience that outside overheat brought.

In one embodiment, the shell comprises side plates and end plates, the side plates and the end plates surround to form a heat exchange cavity, two ends of 2 or more heat exchange pieces are fixed on the end plates, and the supporting parts are formed on the side plates and used for supporting the heat exchange pieces close to the side plates. Because the supporting parts are arranged on the side plates which are opposite to each other, and the heat exchange pieces are fixed on the end plates which are opposite to each other, the supporting parts can better support the heat exchange pieces and simultaneously do not block the heat exchange pieces to exchange heat in the heat exchange cavity.

In one embodiment, the side plates comprise an inner side plate and an outer side plate, a heat insulation cavity is formed between the inner side plate and the outer side plate, the inner side plate protrudes towards one side of the heat exchange cavity to form a supporting part, and the supporting part is abutted to the heat exchange member close to the inner side plate. Divide into interior curb plate and outer panel with the curb plate, and form thermal-insulated chamber between the interior curb plate, can reduce the heat transfer between the interior curb plate of outside better. Because the supporting part is formed on the inner side plate and is integrally formed with the inner side plate, and the supporting part is abutted against the close heat exchange piece, the assembly stability of the heat exchange piece can be improved on the basis of not increasing the assembly complexity.

In one embodiment, the insulating chamber contains an insulating layer comprising an insulating material. The heat insulation layer containing the heat insulation material is further arranged in the heat insulation cavity, so that the heat transfer between the inner side plate and the outer side plate can be further reduced.

In one embodiment, the end plate is provided with a first connecting portion, the inner side plate is provided with a second connecting portion, the outer side plate is provided with a third connecting portion, and the first connecting portion is fixedly connected with the corresponding second connecting portion and the corresponding third connecting portion in an overlapping mode. Because the connecting parts of the end plate, the inner side plate and the outer side plate are overlapped and fixed, the connection of every two plates is avoided, and the processing procedures can be reduced.

In one embodiment, the first connecting portion, the second connecting portion and the third connecting portion respectively have two or more through holes. The first connecting part, the second connecting part and the third connecting part can be fixedly connected through two or more screws or rivets, so that the connection reliability is ensured.

In one embodiment, a second heat exchange channel for passing a second heat exchange medium is formed between adjacent raised heat exchange portions on a side facing away from the first heat exchange channel, the heat exchange member further comprises a tube wall which separates the first heat exchange channel and the second heat exchange channel, the first heat exchange channel is located in the tube wall, and the raised heat exchange portions are distributed at intervals along the axial direction of the first heat exchange channel and are arranged around the first heat exchange channel. The raised heat exchange part replacing the heat exchange plate is formed by bending the pipe wall, so that the integration of the heat exchange plate and the pipe body is realized, the problems of poor contact between the heat exchange plate and the pipe and the like are solved, 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 heat exchange plate and the pipe are not needed to be welded, the product percent of pass is improved, and the problems of complex welding process, higher welding requirement, easy generation of lattice change, larger thermal resistance and the like of the spiral finned pipe are solved. In addition, the protruding heat exchange part is formed by bending the pipe wall, batch production and standardization are easier to realize in the process, and the distances between the heat exchange sheets and the first heat exchange channel (namely the inner pipe channel) can be more uniform due to standardized production, so that the phenomenon of local high-temperature damage is avoided, and the reliability of the heat exchange part and even a product is ensured. The heat exchange element is much more likely to deform than the light pipe during the manufacturing process and the using process, and the support member can be arranged in the heat exchange element to better correct or prevent the deformation, particularly the deformation in the axial direction.

The utility model also provides a gas heater, including foretell heat transfer device. Because the raised heat exchange parts between the two heat exchange parts of the gas water heater are separated from each other, namely the design of the non-one-piece type fins is adopted, the method can be used for reducing the cost of a die (the heat exchange parts are easy to realize standardization) and avoiding the waste of materials (the fins are not needed to be punched out due to the local high-temperature damage), and the processing and detection of a single heat exchange part are facilitated due to the reduction of the local high-temperature areas of the heat exchange plates, so that the size structure design and the adjustment of the heat exchanger are facilitated, and the expansion of products in the later period is facilitated. And the shell is provided with the supporting part, so that supporting force can be provided for the heat exchange part, and the assembling reliability of the heat exchanger is improved and the heat exchange performance is ensured.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

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 described 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 without creative efforts.

FIG. 1 is a schematic structural view of a heat exchange device in one embodiment;

FIG. 2 is another schematic structural diagram of a heat exchange device;

FIG. 3 is a schematic cross-sectional view of a heat exchange apparatus;

FIG. 4 is another schematic cross-sectional view of a heat exchange device;

FIG. 5 is an axial cross-sectional view of the heat exchange element;

fig. 6 is an enlarged view of a portion I of fig. 5.

Reference numerals:

1. a first heat exchange channel; 2. a second heat exchange channel; 3. a heat exchange member; 31. a raised heat exchanging portion; 32. a surrounding part; 33. a connecting portion; 4. connecting the elbow; 5. a water pipe joint; 6. a housing; 61. a support portion; 611. a flow guide surface; 62. an end plate; 621. a first connection portion; 63. an inner side plate; 631. a second connecting portion; 64. an outer panel; 641. a third connecting portion; 65. a thermally insulating cavity; 66. a thermal insulation layer; 67. a through hole; 7. a top baffle; 8. side baffles.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "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, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present 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," and "fixed" are to be construed broadly and may, 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. 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 one embodiment, please refer to fig. 1 to 2, a heat exchange device includes a housing 6 and a heat exchange member 3, a heat exchange cavity is formed in the housing 6, the heat exchange member 3 is accommodated in the heat exchange cavity, and a first heat exchange channel 1 for a first heat exchange medium to pass through is formed inside the heat exchange member 3, wherein a raised heat exchanging portion 31 is formed on an outer surface of the heat exchange member 3, the raised heat exchanging portions 31 between the two heat exchange members 3 are separated from each other, a support portion 61 is formed on a side of the housing 6 facing the heat exchange cavity, the support portion 61 is arranged along a length direction of the heat exchange member 3, and the support portion 61 generates a supporting force for at least a part of the heat exchange member 3. The heat exchange piece 3 can be a finned tube or other heat exchange tubes, and the finned tube can be a non-one-piece fin, namely an independent fin. The support portion 61 may be integrally formed with the housing 6, or welded or riveted to the housing 6.

In this embodiment, the heat exchange member 3 is in the use, and water is led to in the first heat exchange channel 1, can cause the impact to produce stress to the pipe wall when water pressure fluctuates, causes surging, seriously produces shake bending deformation etc. or the heat exchange member 3 can appear bending deformation after processing, and the supporting part 61 plays the supporting role to the heat exchange member 3, makes the difficult deformation that takes place of heat exchange tube in use.

Further, referring to fig. 2 and fig. 3, the supporting portion 61 is long, the length direction of the supporting portion 61 is parallel to the length direction of the heat exchanging element 3, the supporting portion 61 is provided with a flow guiding surface 611, and the flow guiding surface 611 is inclined toward the middle of the heat exchanging cavity in the main flow direction of the second heat exchanging medium. Heat transfer piece 3 is in the use, leads to water in the first heat transfer passageway 1, can lead to the fact the impact to the pipe wall when water pressure is undulant and produce stress, causes the surge, seriously produces shake and become bent and warp etc. and the gravity of water itself can also lead to the fact the pipe to become bent and warp, and the setting is extended in the length direction that is on a parallel with heat transfer piece 3 to supporting part 61, can provide better bearing for heat transfer piece 3.

Further, the casing 6 is provided with a heat insulating portion for reducing heat transfer from the heat exchange chamber to a space other than the casing 6. Specifically, the heat insulating portion may be a heat insulating material wrapped inside or outside the case 6, or a heat insulating paint coated inside or outside the case 6. Because the integral type fin among the prior art welds with the lateral wall of casing 6, have the effect of evenly conducting the heat exchange tube from the 6 lateral walls of casing with the heat, and this embodiment adopts independent fin, be equipped with protruding heat transfer portion 31 promptly on heat transfer member 3 surface, weaken with the heat conduction of the 6 lateral walls of casing, set up heat-insulating portion in casing 6 and realize keeping warm to the heat transfer chamber on the one hand, reduce the heat and dispel outward, on the other hand makes the overheated condition can not appear on the 6 surface of casing, reduce the inconvenience that outside overheated brought.

Referring to fig. 2 to 4 as an exemplary embodiment, the casing 6 includes side plates and end plates 62, the side plates and the end plates 62 surround to form a heat exchange cavity, two or more heat exchange members 3 are fixed to the end plates 62, and a support portion 61 is formed on the side plates and is used for supporting the heat exchange members 3 close to the side plates. The side plates comprise an inner side plate 63 and an outer side plate 64, a heat insulation cavity 65 is formed between the inner side plate 63 and the outer side plate 64, the inner side plate 63 protrudes towards one side of the heat exchange cavity to form a long supporting part 61, and the supporting part 61 is abutted to the heat exchange member 3 close to the inner side plate 63. The heat insulation cavity 65 may be vacant, or as shown in fig. 4, a heat insulation layer 66 may be contained in the heat insulation cavity 65, and the heat insulation layer 66 contains a heat insulation material. In particular, the insulating material may be aluminium silicate. The end plate 62 is provided with a first connecting portion 621, the inner side plate 63 is provided with a second connecting portion 631, the outer side plate 64 is provided with a third connecting portion 641, and the first connecting portion 621 is fixedly connected with the corresponding second connecting portion 631 and third connecting portion 641 in an overlapping manner. The first connecting portion 621 and the corresponding second connecting portion 631 and third connecting portion 641 respectively have two or more through holes 67, and the through holes 67 are used for screws or rivets to pass through to fix the end plate 62, the inner plate 63 and the outer plate 64.

Further, referring to fig. 5 to 6, on a side facing away from the first heat exchanging channel 1, a second heat exchanging channel 2 for a second heat exchanging medium to pass through is formed between adjacent raised heat exchanging portions 31, the heat exchanging element 3 further includes a tube wall that partitions the first heat exchanging channel 1 and the second heat exchanging channel 2, the first heat exchanging channel 1 is located in the tube wall, and the raised heat exchanging portions 31 are distributed at intervals along an axial direction of the first heat exchanging channel 1 and 31 are arranged around the first heat exchanging channel 1. On the side back to first heat exchange passageway 1, form the second heat exchange passageway 2 that supplies the second heat transfer medium to pass through between the adjacent protruding heat exchange portion 31, heat transfer member 3 still includes the pipe wall, the pipe wall cuts off first heat exchange passageway 1 and second heat exchange passageway 2, first heat exchange passageway 1 surrounds by the internal surface of pipe wall and forms, the pipe wall includes along the protruding heat exchange portion 31 of the axial interval distribution of first heat exchange passageway 1, the crooked protruding heat exchange portion 31 that forms of part pipe wall, protruding heat exchange portion 31 arranges around first heat exchange passageway 1. 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, at the top position of the raised heat exchange part 31.

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, the heat exchange member 3 can be simply understood as 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 portions 31 in the axial direction of the heat exchange pipe is n-shaped, the cross section is wave crest, the adjacent portions are U-shaped and wave trough, the cross sections of the plurality of convex heat exchange portions 31 are connected like n-shaped and U-shaped, and the convex heat exchange portions are arranged in a staggered manner. 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 convex heat exchanging part 31 is formed by bending the pipe wall, so that the integration of the heat exchange fins and the pipe body is realized, the problems of poor contact between the heat exchange 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 heat exchange fins and the pipe do not need to be welded, and the product percent of pass is improved. 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 this embodiment, the heat exchange member 3 with the raised heat exchange portion 31 and the tube integrated therein can be used, and the possibility of deformation is much greater than that of the light tube during the manufacturing process and the using process, and the support member can be arranged therein to correct or prevent the deformation, especially the deformation in the axial direction.

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, and heat is transferred to 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 first heat exchange channel 1 is increased, and a heat exchange effect is achieved. The temperature of the part of the traditional heat exchange plate (one-piece fin) far away from the heat exchange tube is as high as 500-600 ℃, and the high-temperature area needs to be cut accurately so as to avoid the phenomenon of local high-temperature damage, particularly, the heat exchange coefficient of stainless steel materials is small, a large amount of stainless steel materials of the heat exchange plate far away from the wall of the heat exchange tube need to be cut, a large amount of materials are wasted, and the process complexity is increased. And adopt the 3 structures of heat transfer spare of this embodiment, both be convenient for process also can reduce the waste of material.

Wherein, heat transfer device can include many heat transfer 3 combination formation, can arrange by the many heat exchange tubes that are no less than the one deck and constitute, also can two-layer or multilayer alternately dislocation arrangement, has into water end, play water end, and the heat exchange tube end to end forms complete water route, and the flue gas flows through between the heat exchanger fin with the water heat transfer. Wherein, the pipe wall surrounds the inside first heat exchange channel 1 that forms of body that forms for the water to pass through, and then forms second heat exchange channel 2 between the protruding heat transfer portion 31 of body outside for the flue gas to pass through. The utility model discloses a body has certain expansion coefficient after the frozen inflation of water, but axial expansion can kick-back after ice dissolves, has reduced the frost crack risk. 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 addition, heat transfer device can also set up top baffle 7 and lateral part baffle 8, for the flue gas water conservancy diversion, reaches the technological effect that promotes heat exchange efficiency. Specifically, along the main flow direction of flue gas, the heat transfer intracavity can include two rows or above heat transfer 3, and two adjacent rows of heat transfer 3 stagger and arrange, top baffle 7 can set up the mouth of a cigarette department in the heat transfer chamber, the length direction of top baffle 7 is on a parallel with the length direction of heat transfer and sets up between two heat transfer of one adjacent row of heat transfer, with flue gas direction heat transfer 3, curb plate baffle 8 then sets up on the curb plate, avoid the flue gas to directly flow away from the space department of heat transfer 3 and curb plate.

In another embodiment, the gas water heater comprises the heat exchange device. The heat exchange device 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, if the shell 6 is provided with a structure such as a communicating convex hull, the water channel is communicated with the water channel of other pipelines through the water pipe connector 5). Wherein, the first heat exchange medium is water, the second heat exchange medium is flue gas, and the flue gas is the water heating that the pipe wall inner chamber of heat transfer spare 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 gas water heater is independently arranged, even the protruding heat exchanging portion 31 is a part of the pipe body, so that the problem of indirect gap between the heat exchanging fin and the pipe body is completely solved, the problems of poor contact between the heat exchanging fin and the pipe and the like are solved, the heat transfer effect is better, the pipe expansion and welding are not needed, the process is simple, the cost is low, the water leakage problem is greatly improved due to the fact that the welding between the heat exchanging fin and the pipe 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 1 is uniform, the phenomenon of local high-temperature damage is avoided. And the shell is provided with the supporting part, so that supporting force can be provided for the heat exchange part, and the assembling reliability of the heat exchanger is improved and the heat exchange performance is ensured.

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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A heat exchange device comprises a shell (6) and heat exchange pieces (3), wherein a heat exchange cavity is formed in the shell (6), the heat exchange pieces (3) are accommodated in the heat exchange cavity, a first heat exchange channel (1) for a first heat exchange medium to pass through is formed in each heat exchange piece (3), the heat exchange device is characterized in that a protruding heat exchange portion (31) is arranged on the outer surface of each heat exchange piece (3), the protruding heat exchange portions (31) between the two heat exchange pieces (3) are separated from each other, a supporting portion (61) is formed on one side of the shell (6) facing the heat exchange cavity, the supporting portions (61) are arranged along the length direction of the heat exchange pieces (3), and the supporting portions (61) generate supporting force on at least part of the heat exchange pieces (3).

2. A heat exchange device according to claim 1, characterised in that the support part (61) is elongated, the length direction of the support part (61) is parallel to the length direction of the heat exchange element (3), the support part (61) is provided with a flow guiding surface (611), and the flow guiding surface (611) is inclined towards the middle of the heat exchange chamber in the main flow direction of the second heat exchange medium.

3. A heat exchange device according to claim 1, characterised in that the housing (6) is provided with insulation for reducing the heat transfer of the heat exchange chamber to a space outside the housing (6).

4. The heat exchange device according to claim 1, wherein the shell (6) comprises side plates and end plates (62), the side plates and the end plates (62) surround to form the heat exchange cavity, two or more ends of the heat exchange members (3) are fixed on the end plates (62), and the support parts (61) are formed on the side plates and are used for supporting the heat exchange members (3) close to the side plates.

5. A heat exchange device according to claim 4, characterised in that the side plates comprise an inner side plate (63) and an outer side plate (64), between which inner side plate (63) and outer side plate (64) a heat insulating chamber (65) is formed, the inner side plate (63) bulging towards one side of the heat exchange chamber to form the support (61), the support (61) abutting the heat exchange element (3) close to the inner side plate (63).

6. The heat exchange device according to claim 5, characterized in that a heat insulating layer (66) is arranged in the heat insulating cavity (65), and the heat insulating layer (66) comprises a heat insulating material.

7. The heat exchange device according to claim 5, characterized in that the end plate (62) is provided with a first connecting portion (621), the inner side plate (63) is provided with a second connecting portion (631), the outer side plate (64) is provided with a third connecting portion (641), and the first connecting portion (621) is fixedly connected with the corresponding second connecting portion (631) and the third connecting portion (641) in an overlapping manner.

8. The heat exchange device according to claim 7, wherein the first connecting portion (621) and the corresponding second connecting portion (631) and third connecting portion (641) are respectively provided with two or more corresponding through holes (67).

9. The heat exchange device according to any one of claims 1 to 7, wherein a second heat exchange channel (2) for passing a second heat exchange medium is formed between adjacent raised heat exchange portions (31) on the side facing away from the first heat exchange channel (1), the heat exchange member (3) further comprises a tube wall which partitions the first heat exchange channel (1) and the second heat exchange channel (2), the first heat exchange channel (1) is located in the tube wall, and the raised heat exchange portions (31) are distributed at intervals along the axial direction of the first heat exchange channel (1) and are arranged around the first heat exchange channel (1).

10. A gas water heater comprising the heat exchange device of any one of claims 1 to 9.

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