CN117053397A

CN117053397A - Heat exchanger

Info

Publication number: CN117053397A
Application number: CN202310779774.8A
Authority: CN
Inventors: 宁忠坤; 郭全胜; 殷红; 王成
Original assignee: Chengdu Shihao Electrical Appliance Co ltd
Current assignee: Chengdu Shihao Electrical Appliance Co ltd
Priority date: 2023-06-28
Filing date: 2023-06-28
Publication date: 2023-11-14

Abstract

The invention provides a heat exchanger, which comprises a shell, a coil pipe and a combustor. The outer wall of the shell is also provided with an exhaust port. The coil is coiled into a spiral tube shape by a pipeline and is accommodated in the shell. One side of the pipeline, which is close to the inner wall of the shell, is provided with a groove along the length direction of the pipeline. The burner is arranged inside the coil pipe so that hot gas generated by the burner flows into the exhaust port through the gap of the coil pipe. When the heat exchanger is used, high-temperature steam exists in the high-temperature gas, and the high-temperature steam and the coil pipe are subjected to heat exchange chamber cooling so as to be condensed into condensed water. The condensed water is carried to the other side of the pipe by the air flow and is collected by the grooves on the surface of the pipe. Finally, the condensed water flows along the trough to the bottom of the pipe and falls off. The condensate water can be effectively prevented from flowing along the pipe wall of the pipeline at will to contact with the high-temperature gas again, and further heat loss caused by gas heat absorption is avoided. This also increases the efficiency of the heat exchanger.

Description

Heat exchanger

Technical Field

The invention relates to the technical field of water heaters, in particular to a heat exchanger.

Background

Heat exchangers are important components in water heaters that burn to produce hot gas and transfer heat from the hot gas through coils to water within the coils, thereby heating the water. Generally, a heat exchanger includes a housing, a coil, and a burner. The coil is coiled into a spiral tube shape by the pipeline, and a gap for passing hot air is reserved between the pipelines. When the spiral tube is used, the circumferential direction of the spiral tube is along the horizontal direction. The burner is arranged in the coil pipe, and hot gas generated by combustion of the burner flows into a gap between the coil pipe and the shell through the gap of the coil pipe, and is discharged from an exhaust port of the shell.

The water in the air is heated to a high temperature due to the combustion of the burner. The heat exchange between the water vapor and the cold water inside the coil at the coil can lead the high-temperature water vapor to be liquefied when encountering cold. The periphery of the coil pipe in the prior art is smooth, and no water guide groove is arranged, so that condensed water generated at the position above the coil pipe flows downwards along the pipe wall of the coil pipe, and then contacts with hot gas again in a gap of the coil pipe to be vaporized. This makes the condensate water take away part of the heat, and thus makes the heat utilization rate lower.

Disclosure of Invention

The invention aims to provide a heat exchanger which can effectively drain condensed water and avoid heat loss caused by contact of the condensed water with hot gas.

The embodiment of the invention is realized by the following technical scheme:

a heat exchanger comprising a housing, a coil, and a burner; the outer wall of the shell is also provided with an exhaust port; the coil pipe is coiled into a spiral pipe shape by a pipeline and is accommodated in the shell; a groove is formed in one side, close to the inner wall of the shell, of the pipeline along the length direction of the pipeline; the burner is arranged inside the coil pipe, so that hot gas generated by the burner flows into the exhaust port through the gap of the coil pipe.

Further, one side of the pipeline far away from the inner wall of the shell is arranged in an outwards convex arc shape; the other two sides of the pipeline are both planar; the side of the pipeline, which is close to the inner wall of the shell, is arranged in a plane shape, and the groove is arranged on the plane.

Further, the end part of the shell is also provided with a bottom cover; the bottom cover is attached to the end face of one end of the spiral pipe; the bottom cover is right opposite to the end face of the shell and an air channel is reserved between the bottom cover and the end face.

Further, the outer edge of the bottom cover is attached to the inner part of the shell; the lower part of the bottom cover is provided with a channel so that air flow can enter the air duct through the channel; the exhaust port is arranged at the upper part of the shell.

Further, one side of the bottom cover is provided with a plurality of heat exchange columns; and the heat exchange columns are all positioned in the air duct.

Further, the middle part of the bottom cover is attached to the end face of the shell, so that an annular air channel is formed between the bottom cover and the end face of the shell.

Further, the spiral pipe and the annular air duct are positioned at two sides of the bottom cover; the annular air duct is opposite to the end face of the spiral pipe.

Further, one side of the bottom cover is also attached with a heat insulation plate; the heat insulation plate is positioned inside the spiral tube.

Further, one end of the coil pipe, which is close to the bottom cover, is a cold water end.

The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:

when the heat exchanger is used, a large amount of high-temperature gas is generated by the combustion of the burner. These gases enter the exhaust port through the slots of the coil and are exhausted. When the gas passes through the coil gap, the gas exchanges heat with the wall of the coil, so that the exchanged heat exchanges heat with water in the coil again, and the water in the coil is heated.

The high-temperature gas contains high-temperature vapor, and the high-temperature vapor and the coil pipe are subjected to heat exchange chamber cooling so as to be condensed into condensed water. The condensed water is carried to the other side of the pipe by the air flow and is collected by the grooves on the surface of the pipe. Finally, the condensed water flows along the trough to the bottom of the pipe and falls off. The condensate water can be effectively prevented from flowing along the pipe wall of the pipeline at will to contact with the high-temperature gas again, and further heat loss caused by gas heat absorption is avoided. This also increases the efficiency of the heat exchanger.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a heat exchanger provided by the present invention;

FIG. 2 is a cross-sectional view of a heat exchanger;

FIG. 3 is a schematic view of the structure of the interior of the heat exchanger;

FIG. 4 is an enlarged view of FIG. 3 at a;

fig. 5 is a schematic structural view of a coil.

Icon: 1-shell, 11-exhaust port, 2-coil pipe, 21-groove, 3-burner, 4-bottom cover, 5-air duct, 51-heat exchange column and 52-heat insulation board.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which a product of the application is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Examples:

as shown in fig. 1-5, the present invention provides a heat exchanger comprising a housing 1, a coil 2 and a burner 3. The outer wall of the housing 1 is also provided with an exhaust port 11 for exhausting exhaust gas from the inside thereof. The coil pipe 2 is coiled into a spiral pipe shape by a pipeline and is accommodated inside the shell 1. In order to facilitate the passage of gas, a gap is left between the pipes. After the coil pipe 2 is placed in the interior of the shell 1, a gap is left between the coil pipe and the inner wall of the shell 1. The side of the pipe close to the inner wall of the housing 1 is provided with a groove 21 along the length of the pipe. In practice, the tubing needs to undergo a bulging action prior to coiling so that the tubing is formed into the desired shape. In this process, a groove 21 may be provided along the length of the pipe on one side of the pipe. The burner 3 is arranged inside the coil 2. The hot gas generated by the burner 3 flows through the gap of the coil 2 into the exhaust port 11.

When the heat exchanger of the present invention is used, the burner 3 burns to generate a large amount of high temperature gas. These gases enter the exhaust port 11 through the slots of the coil 2 and are exhausted. When the gas passes through the gaps of the coil pipe 2, the gas exchanges heat with the pipe wall of the coil pipe 2, so that the exchanged heat exchanges heat with water in the coil pipe 2 again, and the water in the coil pipe 2 is heated.

The high temperature gas has high temperature vapor, which is cooled down with the coil pipe 2 to be condensed into condensed water. This condensate is carried by the air flow towards the other side of the pipe and is collected by the grooves 21 in the surface of the pipe. Finally, the condensed water flows along the grooves 21 to the bottom of the pipe and falls off. The condensate water can be effectively prevented from flowing along the pipe wall of the pipeline at will to contact with the high-temperature gas again, and further heat loss caused by gas heat absorption is avoided. This also increases the efficiency of the heat exchanger.

In this embodiment, the side of the pipe away from the inner wall of the housing 1 is provided with a convex arc shape. The other two sides of the pipeline are both planar. The circular arc-shaped pipe wall is more convenient for guiding, so that the air flow can smoothly enter the gap of the pipeline piece and then enter the exhaust port 11 to be exhausted. And further, the air flow passing efficiency can be improved. In addition, the side of the pipe close to the inner wall of the housing 1 is provided in a planar shape. The grooves 21 on this side are designed to be relatively shallow, so long as a small amount of condensate water is available. The fact that the side of the pipe close to the inner wall of the housing 1 is planar results in that this surface occupies less surface area of the whole pipe, and thus more surface area is distributed to both sides of the pipe and to the side of the pipe close to the inner wall of the housing 1. These portions are heat exchange surfaces. That is, this can increase the ratio of the heat exchange area of the pipe to the entire area, resulting in higher heat exchange efficiency.

In this embodiment, the end of the housing 1 is further provided with a bottom cover 4. The housing 1 is generally provided in a cylindrical shape and the housing 1 is inverted. The bottom cover 4 is attached to the end face of one end of the spiral pipe, so that one end of the spiral pipe 2 is blocked by the bottom cover 4. Meanwhile, the bottom cover 4 is opposite to the end face of the shell 1, and an air duct 5 is reserved between the end face and the bottom cover. The exhaust port 11 is connected to the air duct 5. This arrangement makes it necessary for the air flow passing through the slits of the coil 2 to finally flow through the duct 5 to the outlet opening for discharge to the outside of the housing 1. Meanwhile, since the air duct 5 is between the bottom cover 4 and the end face of the housing 1. That is, the air duct 5 and the coil 2 are located at both sides of the bottom cover 4. The gas cooled through the gaps of the coil pipes 2 exchanges heat with the bottom cover 4 again when passing through the air duct 5, and then heat is transferred to the pipeline tightly attached to the bottom cover 4 again, so that the effect of air flow heat exchange is achieved.

The prior art heat exchangers also have the effect of recuperating heat. However, in the prior art, a partition plate is provided in the coil pipe 2, so that the inside of the tubular coil pipe 2 is divided into two chambers. The hot gas passes through the first chamber and out of the coil 2. And then enters the second chamber through the gap of the next section of coil pipe 2 for heat exchange again. Although recuperation can also be achieved in this way. However, with the same coil 2, this arrangement allows the air flow to pass through only a portion of the gap of the coil 2 at a time, thereby allowing greater pressure to be required for each pass of the air flow through the gap. The air flow in this embodiment passes through the gaps of the whole coil pipe 2, so that the air flow is smoother and more beneficial to exhaust. In order to better enable the bottom cover 4 to exchange heat, the end of the coil pipe 2 close to the bottom cover 4 is a cold water end.

In this embodiment, the outer edge of the bottom cover 4 is attached to the inside of the case 1. The lower part of the bottom cover 4 is provided with a passage to allow air flow to pass through the passage into the air duct 5. The exhaust port 11 is provided at an upper portion of the housing 1. This arrangement is such that air passing through the gap above the coil 2 must flow between the coil 2 and the housing 1 to the lower part of the housing 1 to enter the air duct 5 through the passage in the lower part of the bottom cover 4. In practice, the hot gas inside the coil 2 is more prone to flow out of the gap at the top of the coil 2. The channel is arranged at the lower part of the bottom cover 4, so that the air flow can flow downwards after passing through the gap at the upper part of the coil pipe 2, and the residence time of the air flow at the upper part of the coil pipe 2 is prolonged. Accordingly, the air pressure in the upper portion of the coil 2 is also increased. This is further advantageous in that the hot gas flows out through the gap in the lower part of the coil 2. Thereby making the air flow flowing out from the periphery of the coil pipe 2 have the same size. And further the overall heat exchange effect is better. Meanwhile, the exhaust port 11 is disposed at the upper portion of the housing 1, so that the air flow can flow out through the exhaust port 11 only after entering the air duct 5 and flowing from the lower portion to the upper portion of the air duct 5. The circulation distance of the air flow is increased, and the heat exchange is more facilitated.

In this embodiment, a plurality of heat exchanging columns 51 are provided at one side of the bottom cover 4. The heat exchange columns 51 are all located inside the air duct 5. The heat exchange column 51 extends into the air duct 5, and then is in contact with hot air more fully, so that heat exchange is performed better.

In this embodiment, the middle part of the bottom cover 4 is attached to the end surface of the housing 1, so that an annular air duct 5 is formed between the bottom cover 4 and the end surface of the housing 1. The spiral pipe and the annular air duct 5 are positioned at both sides of the bottom cover 4. The annular air duct 5 is opposite to the end face of the spiral pipe. If the whole bottom cover 4 is in the air duct 5, the heat in the middle of the bottom cover 4 is difficult to transfer to the coil pipe 2. The annular air duct 5 allows heat exchanged during the re-heat exchange to be transferred directly to the coil 2 through the bottom cover 4.

In this embodiment, a heat insulation board 52 is attached to one side of the bottom cover 4. The heat shield 52 is located inside the spiral tube. This prevents the hot air inside the coil 2 from heat exchanging to the middle of the bottom cover 4, thereby avoiding heat dissipation.

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

Claims

1. A heat exchanger, characterized by: comprises a shell (1), a coil pipe (2) and a burner (3); the outer wall of the shell (1) is also provided with an exhaust port (11); the coil pipe (2) is coiled into a spiral tube shape by a pipeline and is accommodated in the shell (1); a groove (21) is formed in one side, close to the inner wall of the shell (1), of the pipeline along the length direction of the pipeline; the burner (3) is arranged inside the coil (2) so that hot gas generated by the burner (3) flows into the exhaust port (11) through a gap of the coil (2).

2. The heat exchanger of claim 1, wherein: one side of the pipeline far away from the inner wall of the shell (1) is arranged in an outwards convex arc shape; the other two sides of the pipeline are both planar; one side of the pipeline, which is close to the inner wall of the shell (1), is arranged in a plane shape, and the groove (21) is arranged on the plane.

3. A heat exchanger according to claim 2, wherein: the end part of the shell (1) is also provided with a bottom cover (4); the bottom cover (4) is attached to the end face of one end of the spiral pipe; the bottom cover (4) is right opposite to the end face of the shell (1) and an air duct (5) is reserved between the end face and the bottom cover.

4. A heat exchanger according to claim 3, wherein: the outer edge of the bottom cover (4) is attached to the inside of the shell (1); a channel is arranged at the lower part of the bottom cover (4) so that air flow can enter the air channel (5) through the channel; the exhaust port (11) is provided in the upper part of the housing (1).

5. The heat exchanger of claim 4, wherein: a plurality of heat exchange columns (51) are arranged on one side of the bottom cover (4); and a plurality of heat exchange columns (51) are positioned in the air duct (5).

6. The heat exchanger of claim 5, wherein: the middle part of the bottom cover (4) is attached to the end face of the shell (1), so that an annular air channel (5) is formed between the bottom cover (4) and the end face of the shell (1).

7. The heat exchanger of claim 6, wherein: the spiral pipe and the annular air duct (5) are positioned at two sides of the bottom cover (4); the annular air duct (5) is opposite to the end face of the spiral pipe.

8. The heat exchanger of claim 7, wherein: a heat insulation plate (52) is attached to one side of the bottom cover (4); the heat shield (52) is positioned within the spiral tube.

9. The heat exchanger of claim 8, wherein: one end of the coil pipe (2) close to the bottom cover (4) is a cold water end.