Patent Application
20210333013
This application claims the priority to the Chinese Patent Application No. 202010348653.4, filed on Apr. 28, 2020, which is hereby incorporated by reference its entirety.
The present disclosure relates to the technical field of water heating apparatuses, in particular to a heat exchange pipe, a heat exchanger and a water heating apparatus.
At present, the heat exchanger of a gas water heater is equipped with a heat exchange pipe that exchanges heat with flue gas. In order to increase the heat exchange area outside the pipe and increase the heat exchange amount of the heat exchange pipe, finned tubes are usually used as the heat exchange pipe. By processing many fins on the surface of the tube body of finned tubes, the original surface of the tube body is expanded and improved, the heat exchange area and heat exchange amount are increased.
However, the partition gaps between fins of the existing finned tubes are designed to be opened outwardly, which leads to an insufficient contact between flue gas and the tube body, resulting in low heat exchange efficiency.
In addition, in order to improve the heat exchange efficiency of finned tubes, in some water heaters, a flue gas baffle sheet is added on one side of the finned tube to allow full contact of flue gas with the finned tube and prevent flue gas from flowing too fast, thereby improving the heat exchange efficiency. However, this will increase the manufacturing cost, and the flue gas baffle sheet needs to be mounted on one side of the gap outlet of two adjacent circles of the finned tube. The installation accuracy is difficult to control, and the installation difficulty is great, but if the mounting position of the flue gas baffle sheet is not accurate the heat exchange efficiency will be greatly affected.
In view of the above deficiencies, one purpose of the present disclosure is to provide a heat exchange pipe, a heat exchanger and a water heating apparatus, so as to improve the flue gas flow path and heat exchange efficiency.
Another purpose of the present disclosure is to provide a heat exchange pipe, a heat exchanger and a water heating apparatus that cost low and are easy to install.
To achieve at least one of the purposes, the present disclosure adopts the following technical solutions:
A heat exchange pipe, comprising a pipe body and a plurality of fins fixedly disposed to sleeve the pipe body, a flow guiding structure being provided at a partial outer edge of the fin, and a flow guiding flue being formed between the flow guiding structure and an outer wall of the pipe body.
As a referred embodiment, the fin has a first portion in which an outer edge is provided with the flow guiding structure, and a second portion in which an outer edge is not provided with the flow guiding structure; in a case where a part of the fin is intercepted at a same central angle, a heat exchange area of an intercepted part of the first portion is larger than that of an intercepted part of the second portion.
As a referred embodiment, in a case where a part of the fin is intercepted at a same central angle, a difference between the heat exchange area of the intercepted part of the first portion and the heat exchange area of the intercepted part of the second portion is approximately an heat exchange area of the flow guiding structure of the intercepted part.
As a referred embodiment, at least a partial length of the flow guiding structure has a preset width; a direction of the width is a direction of a spacing between adjacent two of the fins; and the preset width is more than 0.9 times the spacing between adjacent two of the fins.
As a referred embodiment, in the adjacent two of the fins, the flow guiding structure of one of the fins is in contact and attached with the other of the fins.
As a referred embodiment, an attaching length of the flow guiding structure accounts for more than 0.8 of a length of the whole flow guiding structure.
As a referred embodiment, at least a partial length of the flow guiding structure extends around the pipe body with a constant width.
As a referred embodiment, at least a partial length of the flow guiding flue extends around the pipe body with a constant flow area.
As a referred embodiment, a spacing between an outer edge of the fin not provided with the flow guiding structure and the outer wall of the pipe body is L1, and a spacing between the flow guiding structure and the pipe body is L2, wherein 0.5≤L1≤L2≤1.5L1.
As a referred embodiment, a flue gas inlet communicated with the flow guiding flue and a flue gas outlet communicated with the flow guiding flue are provided between adjacent two of the fins; wherein the heat exchange pipe has an incident side facing flue gas and an effluent side facing away from the flue gas; the flue gas outlet is located on the effluent side, and the flow guiding structures are located on two sides of the flue gas outlet along a circumferential direction.
As a referred embodiment, the flow guiding structures located on the two sides of the flue gas outlet along the circumferential direction have a same length.
As a referred embodiment, the flue gas inlet is located on the incident side; and a length of the flue gas inlet along the circumferential direction is larger than that of the flue gas outlet.
As a referred embodiment, more than half of a length of the flow guiding structure is located on the effluent side.
As a referred embodiment, the flow guiding structure extends along a circumferential direction.
As a referred embodiment, the flow guiding structures are integrated with the fin, and the flow guiding structures are flow guiding flangings located at an outer edge of the fin.
As a referred embodiment, a length of the flue gas inlet along the circumferential direction is less than half of a perimeter of an outer edge of the fin.
As a referred embodiment, a spacing between the flow guiding structure and the pipe body is L2; and a length of the flue gas outlet is 0.5L2 to 3L2 along a direction around the pipe body.
As a referred embodiment, a ratio of a length of the flow guiding flangings to a length of an outer edge of the fin is 0.3 to 0.7 along a direction around the pipe body.
As a referred embodiment, on the pipe body, the flue gas outlets of a first number of fins are aligned along an arrangement direction, while the flue gas outlets of a second number of fins are aligned along an arrangement direction and staggered with the flue gas outlets of the first number of fins along the circumferential direction.
As a referred embodiment, the flue gas outlets of the first number of fins and the flue gas outlets of the second number of fins are staggered by 90 degrees along the circumferential direction.
A heat exchanger, having a spirally coiled heat exchange pipe which comprises a pipe body and a plurality of fins fixedly disposed to sleeve the pipe body, a flow guiding structure being provided at a partial outer edge of the fin, and a flow guiding flue being formed between the flow guiding structure and an outer wall of the pipe body.
As a referred embodiment, the outer edges of the fins of adjacent two circles of the heat exchange pipe are attached to each other.
As a referred embodiment, the heat exchange pipe comprises an inner coiled pipe and an outer coiled pipe surrounding the inner coiled pipe; a partition board is provided between the inner coiled pipe and the outer coiled pipe; a flue gas outlet of a flow guiding flue of the inner coiled pipe faces the partition board.
As a referred embodiment, the outer coiled pipe is spirally coiled around a central axis; an orientation of the flue gas outlet of the outer coiled pipe is parallel to the central axis.
As a referred embodiment, in the outer coiled pipe, the flue gas outlet of the flow guiding flue of one circle of the heat exchange pipe faces the flue gas inlet of the flow guiding flue of a next circle of the heat exchange pipe.
A gas water heating device, comprising: a gas exchanger as described in any one of the above embodiments.
The heat exchange pipe provided by one embodiment of the present disclosure forms a flow guiding flue by using the flow guiding structures on the fins, and the flow guiding flue can guide flue gas to the surface of the pipe body of the heat exchange pipe, so that outward diffusion of flue gas between the fins is avoided and the heat exchange efficiency of the heat exchange pipe is improved.
In addition, adopting the heat exchange pipe provided by this embodiment does not require mounting of a flue gas baffle sheet in the heat exchanger. This reduces the installation difficulty and is of great practical value.
Particular embodiments of the present disclosure are disclosed in detail with reference to the descriptions and figures given below, and the ways in which the principle of the present disclosure can be employed are pointed out. It should be appreciated that the embodiments of the present disclosure are not limited in scope thereby.
Features which are described and/or indicated for one embodiment can be used in one or more other embodiments in an identical or similar way, can be combined with features in the other embodiments, or can replace the features in the other embodiments.
It should be emphasized that the term “comprise/include” used in this text refers to the presence of features, integers, steps or components, but does not exclude the presence or addition or one or more other features, integers, steps or components.
In order to explain more clearly the technical solutions in the embodiments of the present disclosure or in the prior art, the following will briefly introduce the figures needed in the description of the embodiments or the prior art. Obviously, figures in the following description are only some embodiments of the present disclosure, and for a person skilled in the art, other figures may also be obtained based on these figures without paying creative efforts.
In order to enable persons skilled in the art to better understand the technical solutions in the present disclosure, a clear and comprehensive description to the technical solutions in the embodiments of the present disclosure will be made in the following in combination with the figures in the embodiments of the present disclosure, and obviously, the embodiments described in this text are only part of the embodiments of the present disclosure rather than all the embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary skilled persons in the field without paying creative efforts should pertain to the scope of protection of this disclosure.
What needs to be explained is that, when an element is referred to as being “provided on” another element, it can be directly on the other element, or an intervening element may also be present. When an element is considered to be “connected to” another element, it can be directly connected to the other element, or an intervening element may also be present. The terms “perpendicular”, “horizontal”, “left” and “right” as well as similar expressions used in the text are only for the purpose of explanation, and do not represent the unique embodiment.
Unless otherwise defined, all technical and scientific terms used in the text have the same meaning as commonly understood by persons pertaining to the technical field of the present disclosure. The terminology used in the Description of the present disclosure is for the purpose of describing the specific embodiments only, and is not intended to limit the present disclosure. The term “and/or” used in the text includes any and all combinations of one or more of the associated listed items.
Referring to
The heat exchange pipe 500 provided by this embodiment forms the flow guiding flue 6 by using the flow guiding structures 3 on the fins 1, and the flow guiding flue 6 can guide flue gas to the surface of the pipe body 20 of the heat exchange pipe 500, so that outward diffusion of flue gas between the fins 1 is avoided and the heat exchange efficiency of the heat exchange pipe 500 is improved.
In addition, adopting the heat exchange pipe 500 provided by this embodiment does not require mounting of a flue gas baffle sheet in the heat exchanger, which reduces the installation difficulty and is of great practical value.
In this embodiment, as shown in
A partition gap is formed between two adjacent annular main bodies 2. The flow guiding structure 3 covers the partition gap at the outer edge 8 of the annular main body 2, so that the flow guiding structure 3, (walls of) the two adjacent annular main bodies 2 and the outer wall of the pipe body 20 can enclose the flow guiding flue 6. The flow guiding structure 3 can avoid the outward diffusion of flue gas in the flow guiding flue 6, ensuring that the flue gas exchange heat with the fin 1 and the pipe body 20 as much as possible, thereby improving the heat exchange efficiency.
In this embodiment, the flow guiding structure 3 extends along the outer edge 8 of the annular main body 2. The flow guiding structure 3 and the annular main body 2 may form a bent structure. The flow guiding structure 3 and the annular main body 2 may be perpendicular to each other, and of course, they may also form an acute angle or an obtuse angle. The present disclosure does not give a special limitation to this.
As can be seen in
The fin 1 also has an inner ring 7, and one end of the inner ring 7 has a plurality of positioning protrusions 9 along the circumferential direction. As shown in
In this embodiment, the heat exchange area of the fins 1 can be enlarged by adding flow guiding structures 3, and thereby the heat exchange efficiency of the heat exchange pipe 500 is improved. To be specific, the fin 1 has a first portion in which an outer edge 8 is provided with the flow guiding structure 3, and a second portion in which an outer edge 8 is not provided with the flow guiding structure 3. In a case where a part of the fin 1 is intercepted at a same central angle α, the heat exchange area of the intercepted part of the first portion is larger than that of the intercepted part of the second portion.
Further, in a case where a part of the fin 1 is intercepted at a same central angle, a difference between the heat exchange area of the intercepted part of the first portion and the heat exchange area of the intercepted part of the second portion is approximately an heat exchange area of the flow guiding structure 3 of the intercepted part.
To facilitate understanding, a schematic example is: as shown in
In this embodiment, at least a partial length of the flow guiding structure 3 has a preset width. A direction of the width is a direction of a spacing between adjacent two of the fins 1, i.e. the H direction in
In order to form the closed flow path to avoid overflow of flue gas, the preset width is more than 0.9 times the spacing between adjacent two of the fins 1. Of course, the width direction of the flow guiding structure 3 may also be the extending direction/length direction of the pipe body 20, i.e. the H direction in
The preset width may be a range value or a constant value, which can be understood as: the width of a partial length of the flow guiding structure 3 changes when the flow guiding structure 3 extends along the circumferential direction, for example, the width of at least a partial length of the flow guiding structure 3 changes between 0.9L and L (L is the spacing between two fins 1). Or, at least a partial length of the flow guiding structure 3 extends around the pipe body 20 with a constant width. For example, the width of the entire length of the flow guiding structure 3 is L, and the shape of the flow guiding structure 3 when tiled is a rectangular strip. The at least partial length may be 0.5 times the total length of the flow guiding structure 3. Further, in this embodiment, the entire length of the flow guiding structure 3 has a preset width which is equal to the spacing between two fins 1.
Of course, in other embodiments, the width of the flow guiding structure 3 may even be greater than the spacing between two fins 1, and the flow guiding structure 3 may be provided on adjacent fins 1.
In this embodiment, in adjacent two of the fins 1, the flow guiding structure 3 of one fin 1 is in contact and attached with the other fin 1. In this way the overflow of flue gas can be avoided to the largest extent, the heat exchange efficiency is improved, and the closed flow guiding flue 6 is formed. In addition, by attaching the flow guiding structure 3 to the fin 1, the fin 1 can be positioned while mounted, which facilitates the mounting of the fin 1. To ensure that flue gas flows around the pipe body 20 as much as possible and to avoid outward diffusion thereof, the attaching length of the flow guiding structure 3 accounts for more than 0.8 of the length of the whole flow guiding structure 3. Preferably, the entire length of the flow guiding structure 3 is attached with the fins 1.
To avoid the increase of flue gas flow resistance, at least a partial length of the flow guiding flue 6 extends around the pipe body 20 with a constant flow area. When the flow guiding flue 6 extends around the pipe body 20, the radial dimension of the flow guiding flue 6 does not change. To be specific, as shown in
As shown in
For the incident side 10 of the heat exchange pipe 500, flue gas flows towards its surface and thus a better heat exchange effect is achieved. For the effluent side 11, if no flow guiding structure 3 is provided, it is difficult to make flue gas contact and exchange heat with the effluent side 11 because the flue gas will continue to flow forward after passing through the incident side 10, resulting in a poor heat exchange effect on the effluent side 11. In this embodiment, by setting the flow guiding structure 3 and the flow guiding flue 6 formed by the flow guiding structure 3, flue gas flows into the flow guiding flue 6 rather than freely flowing and diffusing after passing through the incident side 10, and exchanges heat with the fin 1 and the pipe body 20 in the flowing process in the flow guiding flue 6, so as to improve the overall heat exchange efficiency of the heat exchange pipe 500. The flow guiding structure 3 covers more than half of the effluent side 11 in a direction around the pipe body 20. Correspondingly, the flow guiding flue 6 covers more than half of the effluent side 11 in a direction around the pipe body 20. Referring to
To continue the above description, the flue gas inlet 4 is located at the incident side 10. The length of the flue gas inlet 4 along a circumferential direction is greater than that of the flue gas outlet 5. More than half of the length of the flow guiding structure 3 is located on the effluent side 11. Take the pipe body 20 as a round tube as an example, half of the pipe body 20 is the incident side 10 (corresponding to a central angle of 180 degrees), and the other half of it is the effluent side 11. Preferably, the entire flow guiding structure 3 is located on the effluent side 11, the flue gas inlet 4 is located on the incident side 10, and the central angle that is covered by the flue gas inlet 4 is also 180 degrees. To improve the flue gas gathering and guiding effect, the length of the flue gas inlet 4 along the circumferential direction (direction of the circumference) is less than half of the perimeter of the outer edge 8 of the fin 1. In this embodiment, the length of the flue gas inlet 4 along the circumferential direction is half of the perimeter of the outer edge 8 of the fin 1.
In this embodiment, the spacing between the flow guiding structure 3 and the pipe body 20 is L2; and the length of the flue gas outlet 5 is 0.5L2 to 3L2 (0.5 times L2 to 3 times L2) along a direction around the pipe body 20. For example, the flue gas outlet 5 has a length of 3 mm to 10 mm along the direction around the pipe body 20. The flue gas outlet 5 is located between two flow guiding flangings (flow guiding structures 3). The flow guiding structure 3 constructs a flow guiding flue 6 between the flue gas outlet 5 and the flue gas inlet 4 that communicates the flue gas outlet 5 and the flue gas inlet 4. The ratio of the length of the flow guiding structure 3 to the length of the outer edge 8 of the fin 1 is 0.3 to 0.7 along the direction around the pipe body 20. Preferably, the spacing between the flow guiding structure 3 and the pipe body 20 is L2; and the length of the flue gas outlet 5 is 0.5L2 to 3L2 along the direction around the pipe body 20.
On the pipe body 20, the flue gas outlets 5 of a first number of fins 1 are aligned along an arrangement direction, while the flue gas outlets 5 of a second number of fins 1 are aligned along an arrangement direction and staggered with the flue gas outlets 5 of the first number of fins 1 along the circumferential direction. To be specific, the flue gas outlets 5 of the first number of fins 1 and the flue gas outlets 5 of the second number of fins 1 are staggered by 90 degrees along the circumferential direction. When coiling up the heat exchange pipe 500, the heat exchange pipe of the length corresponding to the first number of fins 1 may form an inner coiled pipe, and the heat exchange pipe of the length corresponding to the second number of fins 1 may form an outer coiled pipe.
Based on the same idea, the embodiments of the present disclosure also provide a heat exchanger and a water heating apparatus as described in the following embodiments. Since the principles by which the heat exchanger and the water heating apparatus solve problems and the technical effects achieved are similar to that of the heat exchange pipe 500, reference can be made to the implementation of the heat exchange pipe 500 described above for the implementation of the heat exchanger and water heating apparatus. No redundant depiction will be given here for the repeated content.
Continuing to refer to
To prevent flue gas from escaping between the heat exchange pipes 500 and facilitate flue gas entering the flow guiding flue 6, the outer edges 8 of the fins 1 of adjacent two circles of the heat exchange pipe 500 are attached to each other. The attaching position on the inner coiled pipe 300 may be an end portion of the flow guiding structure 3 or a boundary position between the flue gas inlet 4 and the flow guiding structure 3. In this way, it is possible to avoid formation of other flue gas emission paths between two adjacent circles of the heat exchange pipe 500, so that flue gas enters the flow guiding flue 6 as much as possible after passing through the flue gas inlet 4, allowing all flue gas to participate in the heat exchange with the pipe body 20 and the fin 1 on the effluent side 11, thereby improving the heat exchange efficiency.
In this embodiment, as shown in
The heat exchanger has a shell 100 which as a whole is a hollow cylinder. The partition board 600 in the shell 100 is a cylindrical structure, and is located between the outer coiled pipe 400 and the inner coiled pipe 300. The side wall of the shell 100 has a gas exhaust port 700 which is substantially located on one end of the shell 100 and opens into the shell 100. An external space for accommodating the outer coiled pipe 400 is formed between the partition board 600 and the shell 100. To avoid flue gas flowing outside the heat exchange pipe 500 and make flue gas flowing in the flow guiding flue 6 as much as possible so as to improve the heat exchange effect, the spacing between the shell 100 and the partition board 600 may be equal to the outer diameter of the heat exchange pipe 500 (outer diameter of the outer edge 8 of the fin 1). The outer coiled pipe 400 is attached with the inner wall of the shell 100 and the outer wall of the partition board 600.
The outer coiled pipe 400 spirally coils up around a central axis. Correspondingly, the inner coiled pipe 300 also spirally coils up around the central axis. The orientation of the flue gas outlet 5 of the outer coiled pipe 400 is parallel to the central axis. To be specific, in the outer coiled pipe 400, the flue gas outlet 5 of the flow guiding flue 6 of one circle of the heat exchange pipe 500 faces the flue gas inlet 4 of the flow guiding flue 6 of a next circle of the heat exchange pipe 500. The orientation of the flue gas outlet 5 of the outer spirally coiled pipe 400 is perpendicular to the orientation of the flue gas outlet 5 of the inner coiled pipe 300. The orientation of the flue gas outlet 5 of the inner coiled pipe 300 is perpendicular to the partition board 600. The orientation of the flue gas outlet 5 of the outer coiled pipe 400 is parallel to the partition board 600.
In this embodiment, the partition board 600 in the heat exchanger only needs to be placed between the outer coiled pipe 400 and the inner coiled pipe 300, so that the installation is easier. The interior of the inner coiled pipe 300 is a combustion chamber 200, and the inner coiled pipe 300 surrounds the combustion chamber 200. Flue gas flows outward from the inner coiled pipe 300, wherein the opening of the flue gas inlet 4 faces inward and the opening of the flue gas outlet 5 faces outward. Flue gas first enters the flow guiding flue 6 on the upper and lower sides (based on the orientation facing
In this embodiment, as shown in
An embodiment of the present disclosure also provides a water heating apparatus comprising the heat exchanger according to any one of the above embodiments. This water heating apparatus may be a gas water heating device. More specifically, the water heating apparatus may be a gas water heater, a wall-hanging stove or a condensing type water heater. Of course, the water heating apparatus may also be a heating stove.
Any numeral values cited herein include all values of the lower values and the upper values from the lower limiting value to the upper limiting value, in increments of one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if the value illustrating the number or process variable (such as temperature, pressure and time, etc.) of a component is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, then the purpose is to explain that the Description also explicitly enumerates values such as 15 to 85, 22 to 68, 43 to 51 and 30 to 32. For values which are less than one, one unit is appropriately considered to be 0.0001, 0.001, 0.01 or 0.1. These are only examples of what is specifically intended, and all possible combinations of numerical values between the lowest value and the highest value enumerated, are all expressly stated in the Description in similar ways.
Unless otherwise stated, all numerical ranges include the endpoints and all numbers that fall between the endpoints. The use of “about” or “approximately” in connection with a range applies to both ends of the range. Therefore, “about 20 to 30” is intended to cover “about 20 to about 30”, inclusive of at least the specified endpoints.
All articles and reference documents, including patent applications and publications, disclosed herein are incorporated by reference. The term “substantially formed of . . . ” describing combinations should include the determined elements, components, parts or steps as well as other elements, components, parts or steps that do not affect the basic novel features of the combination in substance. The use of the terms “contain” or “include” to describe the combinations of elements, components, parts or steps herein also give rise to the embodiments constituted substantially by these elements, components, parts or steps. The term “may” as used herein is intended to explain that any attribute included by the “may” as described is selectable.
Plural elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step might be divided into separate plural elements, components, parts or steps. The disclosed “a” or “an” used for describing elements, components, parts or steps do not exclude other elements, components, parts or steps.
It is to be understood that the above description is intended to be graphically illustrative and not restrictive. Many embodiments and applications other than the examples provided would be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teaching should be determined not with reference to the above description but should, instead, be determined with reference to the appended claims, along with their full scope of equivalents. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not a disclaimer of the subject matter, nor should it be regarded that the inventors did not consider the subject matter to be a part of the disclosed subject matter of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202010348653.4 | Apr 2020 | CN | national |
