CN216048370U - Gas water heater and heat exchanger - Google Patents

Abstract

The utility model relates to a gas water heating device and a heat exchanger. The connecting pipe directly connected with the water inlet end of the second pipeline is communicated with one end of the bypass pipe, the other end of the bypass pipe is connected with any other connecting pipe or water inlet pipe, and when the heat exchanger works, part of cold water on any other connecting pipe or water inlet pipe can enter the bypass pipe and is directly conveyed to the second pipeline through the bypass pipe, so that the cold water is mixed with hot water conveyed to the second pipeline through other heat exchange straight pipes. Therefore, on one hand, the cold water entering the second pipeline through the bypass pipe can reduce the water temperature output to the water outlet pipe by the second pipeline, so that the gasification phenomenon can be effectively weakened, and a temperature controller with higher temperature is not needed; on the other hand, based on the operating principle of the bypass pipe, the amount of water flowing through the heat exchange straight pipes other than the second pipe is smaller than the total amount of water inflow, so that the temperature of the water at this point is higher than that when the bypass pipe is not provided, the temperature of the exhaust gas is also increased, and the generation of condensed water in the heat exchanger is favorably suppressed.

Description

Gas water heater and heat exchanger

Technical Field

The utility model relates to the technical field of water heating devices, in particular to a gas water heating device and a heat exchanger.

Background

In a conventional heat exchanger, when a bypass pipe is required, a water inlet pipe and a water outlet pipe are directly connected to each other through two ends of the bypass pipe, or a coil pipe of the heat exchanger is connected to the water inlet pipe/the water outlet pipe through two ends of the bypass pipe. However, the bypass pipe can directly convey a part of cold water in the water inlet pipe to the water outlet pipe, so that the amount of cold water entering the heat exchanger is small, the temperature of the water outlet position of the heat exchanger is high, the temperature controller with high temperature sensing needs to be selected and arranged at the water outlet point of the heat exchanger, and meanwhile, the bad phenomenon that water gasification is easily generated in the last heat exchange straight pipe of the heat exchanger due to high water temperature is avoided.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the present invention is to provide a heat exchanger which can effectively reduce the gasification phenomenon without using a temperature controller with higher temperature.

The second technical problem to be solved by the present invention is to provide a gas water heater, which can effectively reduce the gasification phenomenon and does not need to use a temperature controller with higher temperature.

The first technical problem is solved by the following technical scheme:

a heat exchanger, the heat exchanger comprising: the heat exchange straight pipes are connected with the connecting pipes in series, the end parts of two adjacent heat exchange straight pipes are connected through the connecting pipes, the heat exchange straight pipe positioned at the head in the plurality of heat exchange straight pipes connected in series is defined as a first pipeline, the water inlet end of the first pipeline is connected with the water inlet pipe, the heat exchange straight pipe positioned at the tail in the plurality of heat exchange straight pipes connected in series is defined as a second pipeline, and the water outlet end of the second pipeline is connected with the water outlet pipe; and the bypass pipe is communicated with one end of the bypass pipe and the connecting pipe directly connected with the water inlet end of the second pipeline, and the other end of the bypass pipe is connected to any one of the other connecting pipes or the water inlet pipe.

Compared with the background technology, the heat exchanger of the utility model has the following beneficial effects:

in the heat exchanger, the connecting pipe directly connected with the water inlet end of the second pipeline is communicated with one end of the bypass pipe, and the other end of the bypass pipe is connected to any one of the other connecting pipes or water inlet pipes, so that when the heat exchanger works, part of cold water on any one of the other connecting pipes or water inlet pipes can enter the bypass pipe and is directly conveyed to the second pipeline through the bypass pipe, and then the cold water is mixed with hot water conveyed to the second pipeline through other heat exchange straight pipes. Therefore, on one hand, the cold water entering the second pipeline through the bypass pipe can reduce the water temperature output to the water outlet pipe by the second pipeline, so that the gasification phenomenon can be effectively weakened, and a temperature controller with higher temperature is not needed; on the other hand, based on the operating principle of the bypass pipe, the amount of water flowing through the heat exchange straight pipes other than the second pipe is smaller than the total amount of water inflow, so that the temperature of the water at this point is higher than that when the bypass pipe is not provided, the temperature of the exhaust gas is also increased, and the generation of condensed water in the heat exchanger is favorably suppressed.

In one embodiment, the heat exchanger further comprises a first tube sheet and a second tube sheet; the first tube plate and the second tube plate are arranged oppositely at intervals, and a plurality of tube holes are formed in the first tube plate and the second tube plate; the plurality of connecting pipes comprise a plurality of first connecting pipes and a plurality of second connecting pipes; first ends of the heat exchange straight pipes are arranged in the pipe holes of the first pipe plate in a one-to-one correspondence mode, and second ends of the heat exchange straight pipes are arranged in the pipe holes of the second pipe plate in a one-to-one correspondence mode; the first connecting pipe is used for being connected with the first ends of the two heat exchange straight pipes in series, and the second connecting pipe is used for being connected with the second ends of the two heat exchange straight pipes in series.

In one embodiment, the first connecting pipe, the first tube plate and the water inlet pipe are all positioned at the first end of the heat exchange straight pipe; the second connecting pipe, the second tube plate and the water outlet pipe are all located at the second end of the heat exchange straight pipe.

In one embodiment, the bypass pipe is located adjacent to the first end of the heat exchange straight pipe or adjacent to the second end of the heat exchange straight pipe. So, the bypass pipe is owing to set up in the adjacent position of heat transfer straight tube first end or the adjacent position of heat transfer straight tube second end, and the bypass pipe is the position that is located the position of first tube sheet place side or second tube sheet place side promptly, and for the mode that traditional bypass pipe both ends were connected inlet tube and outlet pipe respectively, the length of bypass pipe reduces greatly like this to can be under the same pipe diameter, it is bigger to possess the control range, advantage that the cost is lower.

In one embodiment, the heat exchanger further comprises two oppositely disposed connection plates; two sides of the first tube plate are correspondingly connected with two sides of the second tube plate through two connecting plates respectively; the first tube plate, the second tube plate and the two connecting plates are enclosed to form an enclosing frame, and the enclosing frame is arranged on the periphery of the heat exchange straight tube.

In one embodiment, the bottom of the enclosure frame is provided with a flange, and the flange is provided with a mounting hole for mounting on the top of the combustion chamber.

In one embodiment, the heat exchanger further comprises a plurality of heat exchange plates arranged in parallel at intervals, a plurality of through holes corresponding to the plurality of heat exchange straight pipes one to one are formed in the heat exchange plates, and the heat exchange straight pipes penetrate through the through holes.

In one embodiment, the heat exchanger further comprises a temperature sensor, and the temperature sensor is arranged on the water outlet pipe and used for sensing the water temperature of the water outlet pipe.

In one embodiment, a turbulent flow spring is arranged on the inner wall of the heat exchange straight pipe; the heat exchange straight pipe and the connecting pipe are copper pipes, aluminum pipes or stainless steel pipes.

The second technical problem is solved by the following technical solutions:

a gas water heating device comprises the heat exchanger.

Compared with the background technology, the gas water heating device of the utility model has the following beneficial effects:

according to the gas water heating device, the connecting pipe directly connected with the water inlet end of the second pipeline is communicated with one end of the bypass pipe, and the other end of the bypass pipe is connected to any one of the other connecting pipes or water inlet pipes, so that when the gas water heating device works, part of cold water on any one of the other connecting pipes or water inlet pipes can enter the bypass pipe and is directly conveyed to the second pipeline through the bypass pipe, and the cold water is mixed with hot water conveyed to the second pipeline through other heat exchange straight pipes. Therefore, on one hand, the cold water entering the second pipeline through the bypass pipe can reduce the water temperature output to the water outlet pipe by the second pipeline, so that the gasification phenomenon can be effectively weakened, and a temperature controller with higher temperature is not needed; on the other hand, based on the operating principle of the bypass pipe, the amount of water flowing through the heat exchange straight pipes other than the second pipe is smaller than the total amount of water inflow, so that the temperature of the water at this point is higher than that when the bypass pipe is not provided, the temperature of the exhaust gas is also increased, and the generation of condensed water in the heat exchanger is favorably suppressed.

Drawings

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

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

FIG. 1 is a schematic view of a heat exchanger according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a heat exchanger according to another embodiment of the present invention;

FIG. 3 is a schematic view of another embodiment of a heat exchanger according to the present invention;

FIG. 4 is an enlarged schematic view of FIG. 3 at A;

FIG. 5 is an enlarged schematic view of FIG. 3 at B;

fig. 6 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention.

Reference numerals:

10. a heat exchange straight pipe; 11. a first conduit; 12. a second conduit; 20. a connecting pipe; 21. a first connecting pipe; 22. a second connecting pipe; 30. a water inlet pipe; 40. a water outlet pipe; 50. a bypass pipe; 61. a first tube sheet; 62. a second tube sheet; 63. a connecting plate; 64. flanging; 70. a heat exchange plate; 80. a temperature sensor; 90. a turbulent flow spring.

Detailed Description

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

Referring to fig. 1 to 3 and fig. 6, fig. 1 is a schematic view of a heat exchanger according to an embodiment of the present invention; FIG. 2 is a schematic view showing the construction of a heat exchanger according to another embodiment of the present invention; FIG. 3 is a schematic view of another aspect of a heat exchanger according to an embodiment of the present invention; fig. 6 shows a schematic structural diagram of a heat exchanger according to an embodiment of the present invention. An embodiment of the present invention provides a heat exchanger, including: the heat exchange device comprises a heat exchange straight pipe 10, a connecting pipe 20, a water inlet pipe 30, a water outlet pipe 40 and a bypass pipe 50. Heat transfer straight tube 10 is a plurality ofly with connecting pipe 20, a plurality of heat transfer straight tube 10 series connection, the tip of two adjacent heat transfer straight tubes 10 passes through connecting pipe 20 and links to each other, the heat transfer straight tube 10 that lies in the head among a plurality of heat transfer straight tubes 10 of series connection defines first pipeline 11, the end of intaking of first pipeline 11 links to each other with inlet tube 30, the heat transfer straight tube 10 that lies in the end among a plurality of heat transfer straight tubes 10 of series connection defines second pipeline 12, the play water end of second pipeline 12 links to each other with outlet pipe 40. The connection pipe 20 directly connected to the water inlet end of the second pipe 12 communicates with one end of the bypass pipe 50, and the other end of the bypass pipe 50 is connected to any one of the remaining connection pipes 20 (shown in fig. 2) or the water inlet pipe 30 (shown in fig. 1).

In the above heat exchanger, since the connection pipe 20 directly connected to the water inlet end of the second pipe 12 is connected to one end of the bypass pipe 50, and the other end of the bypass pipe 50 is connected to any one of the other connection pipes 20 or the other water inlet pipes 30, in operation, a part of cold water on any one of the other connection pipes 20 or the other water inlet pipes 30 can enter the bypass pipe 50 and be directly delivered to the second pipe 12 through the bypass pipe 50, so as to be mixed with hot water delivered to the second pipe 12 through the other heat exchange straight pipes 10. Therefore, on one hand, the cold water entering the second pipeline 12 through the bypass pipe 50 can reduce the temperature of the water which is output to the water outlet pipe 40 from the second pipeline 12, thereby effectively weakening the gasification phenomenon and not needing to use a temperature controller with higher temperature; on the other hand, based on the operating principle of the bypass pipe 50, since the amount of water flowing through the straight heat exchange pipe 10 other than the second pipe 12 is smaller than the total amount of water inflow, the temperature of the water at that point is increased as compared to when the bypass pipe 50 is not present, and the exhaust gas temperature is also increased, which contributes to suppressing the generation of condensed water in the heat exchanger.

A specific example of the connection pipe 20 is a U-shaped pipe as shown in the drawings, and may be a pipe having another shape.

Referring to fig. 1 and 3, in one embodiment, the heat exchanger further includes a first tube sheet 61 and a second tube sheet 62. The first tube plate 61 and the second tube plate 62 are arranged opposite to each other at intervals, and a plurality of tube holes (not shown in the figure) are formed in each of the first tube plate 61 and the second tube plate 62. The plurality of connection pipes 20 includes a plurality of first connection pipes 21 and a plurality of second connection pipes 22. First ends of the plurality of heat exchange straight pipes 10 are arranged in the plurality of pipe holes of the first pipe plate 61 in a one-to-one correspondence manner, and second ends of the plurality of heat exchange straight pipes 10 are arranged in the plurality of pipe holes of the second pipe plate 62 in a one-to-one correspondence manner. The first connecting pipe 21 is used for connecting the first ends of two of the heat exchange straight pipes 10 in series, and the second connecting pipe 22 is used for connecting the second ends of two of the heat exchange straight pipes 10 in series.

Referring to fig. 1 or fig. 2, in one embodiment, the first connecting pipe 21, the first tube sheet 61 and the water inlet pipe 30 are located at the first end of the heat exchanging straight pipe 10. The second connecting pipe 22, the second pipe plate 62 and the water outlet pipe 40 are all located at the second end of the heat exchange straight pipe 10.

Referring to fig. 1 to 4, fig. 4 is an enlarged schematic view of fig. 3 at a. In one embodiment, the bypass pipe 50 is located adjacent to the first end of the heat exchange straight pipe 10 or adjacent to the second end of the heat exchange straight pipe 10. So, bypass pipe 50 is owing to set up in the adjacent position of heat transfer straight tube 10 first end or the adjacent position of heat transfer straight tube 10 second end, and bypass pipe 50 is the position that is located first tube sheet 61 place side or the position of second tube sheet 62 place side promptly, and for the mode that traditional bypass pipe 50 both ends were connected inlet tube 30 and outlet pipe 40 respectively like this, the length of bypass pipe 50 reduces greatly to can be under the same pipe diameter, it is bigger to possess the control range, advantage that the cost is lower.

Of course, as an alternative, one end of the bypass pipe 50 may be disposed adjacent to the first end of the heat exchange straight pipe 10, and the other end of the bypass pipe 50 may be disposed adjacent to the second end of the heat exchange straight pipe 10, that is, the bypass pipe 50 extends from the position of the first tube plate 61 to the position of the second tube plate 62.

Referring to fig. 3, in one embodiment, the heat exchanger further includes two connecting plates 63 disposed opposite to each other. Two sides of the first tube plate 61 and two sides of the second tube plate 62 are correspondingly connected through two connecting plates 63. The first tube plate 61, the second tube plate 62 and the two connecting plates 63 are enclosed to form an enclosing frame, and the enclosing frame is arranged on the periphery of the heat exchange straight tube 10.

Referring to FIG. 3, in one embodiment, the bottom of the enclosure frame is provided with a flange 64, and the flange 64 is provided with a mounting hole for mounting on the top of the combustion chamber. As such, the flange 64 can facilitate the mounting of the enclosure on the top of the combustion chamber. In addition, when the combustor works, high-temperature flue gas in the combustion chamber enters the inside of the enclosure frame and contacts with the heat exchange plate 70 and the heat exchange straight pipe 10, heat of the high-temperature flue gas is transferred to the heat exchange plate 70, the heat is transferred to the heat exchange straight pipe 10 through the heat exchange plate 70, and the heat exchange straight pipe 10 heats water flow in the heat exchange straight pipe 10.

Referring to fig. 3 and 5, fig. 5 is an enlarged schematic view of fig. 3 at B. In one embodiment, the heat exchanger further includes a plurality of heat exchange plates 70 arranged in parallel at intervals, and a plurality of through holes (not shown) corresponding to the plurality of heat exchange straight pipes 10 are formed in the heat exchange plates 70, and the heat exchange straight pipes 10 are inserted into the through holes.

Referring to fig. 3 and 5, in one embodiment, the heat exchanger further includes a temperature sensor 80. The temperature sensor 80 is disposed on the water outlet pipe 40 for sensing the water temperature of the water outlet pipe 40. Therefore, the water temperature of the water outlet pipe 40 can be timely obtained through the temperature sensor 80, the burner can be well controlled to work according to the water temperature of the water outlet pipe 40, and the water temperature of the water outlet pipe 40 is at the preset temperature.

Referring to fig. 5, in one embodiment, a turbulent spring 90 is disposed on an inner wall of the straight heat exchange tube 10. So, through the inside at heat transfer straight tube 10 setting up vortex spring 90, vortex spring 90 can prolong rivers in heat transfer straight tube 10 the traffic route, plays better heat transfer effect, can reduce combustion noise simultaneously.

In one embodiment, the heat exchange straight pipes 10 and the connecting pipes 20 are all copper pipes, aluminum pipes or stainless steel pipes. Of course, the heat exchange straight tube 10 and the connection tube 20 may also be other metal tubes, which are not limited herein and may be set according to actual requirements.

In one embodiment, a gas-fired water heating apparatus includes the heat exchanger of any of the above embodiments.

In the above-mentioned gas water heating apparatus, since the connection pipe 20 directly connected to the water inlet end of the second pipe 12 is connected to one end of the bypass pipe 50, and the other end of the bypass pipe 50 is connected to any one of the other connection pipes 20 or the water inlet pipe 30, when in operation, a part of cold water on any one of the other connection pipes 20 or the water inlet pipe 30 can enter the bypass pipe 50 and be directly delivered to the second pipe 12 by the bypass pipe 50, so as to be mixed with hot water delivered to the second pipe 12 by the other heat exchange straight pipes 10. Therefore, on one hand, the cold water entering the second pipeline 12 through the bypass pipe 50 can reduce the temperature of the water which is output to the water outlet pipe 40 from the second pipeline 12, thereby effectively weakening the gasification phenomenon and not needing to use a temperature controller with higher temperature; on the other hand, based on the operating principle of the bypass pipe 50, since the amount of water flowing through the straight heat exchange pipe 10 other than the second pipe 12 is smaller than the total amount of water inflow, the temperature of the water at that point is increased as compared to when the bypass pipe 50 is not present, and the exhaust gas temperature is also increased, which contributes to suppressing the generation of condensed water in the heat exchanger.

It should be noted that in an infringement comparison, where one of the elements is described as being connected to another element and one of the elements is attached to another element, it is understood that the two elements may be connected by fasteners such as bolts, screws, pins, rivets, etc., or may be fixedly connected by snapping, welding or integral molding. Wherein, the integrated molding mode can adopt the processes of extrusion, casting, press fitting, injection molding and the like.

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

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

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

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, several means one, or more, and the meaning of "a plurality" is at least two, e.g., two, three, etc., unless explicitly limited otherwise.

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

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

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

Claims (10)

1. A heat exchanger, characterized in that the heat exchanger comprises:

the heat exchange straight pipes (10) and the connecting pipes (20) are multiple, the heat exchange straight pipes (10) are connected in series, the end parts of every two adjacent heat exchange straight pipes (10) are connected through the connecting pipes (20), the heat exchange straight pipe (10) located at the head in the heat exchange straight pipes (10) connected in series is defined as a first pipeline (11), the water inlet end of the first pipeline (11) is connected with the water inlet pipe (30), the heat exchange straight pipe (10) located at the tail in the heat exchange straight pipes (10) connected in series is defined as a second pipeline (12), and the water outlet end of the second pipeline (12) is connected with the water outlet pipe (40); and

and the bypass pipe (50) is communicated with one end of the bypass pipe (50) and the connecting pipe (20) directly connected with the water inlet end of the second pipeline (12), and the other end of the bypass pipe (50) is connected to any one of the other connecting pipes (20) or the water inlet pipe (30).

2. The heat exchanger of claim 1, further comprising a first tube sheet (61) and a second tube sheet (62); the first tube plate (61) and the second tube plate (62) are arranged oppositely at intervals, and a plurality of tube holes are formed in the first tube plate (61) and the second tube plate (62); the plurality of connecting pipes (20) comprise a plurality of first connecting pipes (21) and a plurality of second connecting pipes (22); first ends of the heat exchange straight pipes (10) are arranged in a plurality of pipe holes of the first pipe plate (61) in a one-to-one correspondence mode, and second ends of the heat exchange straight pipes (10) are arranged in a plurality of pipe holes of the second pipe plate (62) in a one-to-one correspondence mode; the first connecting pipe (21) is used for connecting the first ends of two of the heat exchange straight pipes (10) in series, and the second connecting pipe (22) is used for connecting the second ends of two of the heat exchange straight pipes (10) in series.

3. A heat exchanger according to claim 2 wherein the first connecting tube (21), the first tube sheet (61) and the inlet tube (30) are all located at a first end of the heat exchange straight tube (10); the second connecting pipe (22), the second pipe plate (62) and the water outlet pipe (40) are all located at the second end of the heat exchange straight pipe (10).

4. A heat exchanger according to claim 2, characterized in that the bypass pipe (50) is located adjacent to the first end of the heat exchange straight pipe (10) or adjacent to the second end of the heat exchange straight pipe (10).

5. The heat exchanger according to claim 2, further comprising two oppositely arranged connection plates (63); two sides of the first tube plate (61) are correspondingly connected with two sides of the second tube plate (62) through two connecting plates (63) respectively; the first tube plate (61), the second tube plate (62) and the two connecting plates (63) are enclosed to form an enclosing frame, and the enclosing frame is arranged on the periphery of the heat exchange straight tube (10).

6. A heat exchanger according to claim 5, characterised in that the bottom of the frame is provided with a flange (64), the flange (64) being provided with mounting holes for mounting on the top of the combustion chamber.

7. The heat exchanger according to claim 2, further comprising a plurality of heat exchange plates (70) arranged in parallel at intervals, wherein a plurality of through holes corresponding to the plurality of straight heat exchange tubes (10) one by one are formed in the heat exchange plates (70), and the straight heat exchange tubes (10) are inserted into the through holes.

8. The heat exchanger according to any one of claims 1 to 7, further comprising a temperature sensor (80), wherein the temperature sensor (80) is disposed on the outlet pipe (40) for sensing the temperature of the water in the outlet pipe (40).

9. The heat exchanger according to any one of claims 1 to 7, characterized in that a spoiler spring (90) is arranged on the inner wall of the heat exchanging straight pipe (10); the heat exchange straight pipe (10) and the connecting pipe (20) are all copper pipes, aluminum pipes or stainless steel pipes.

10. A gas-fired water heating apparatus, characterized in that it comprises a heat exchanger according to any one of claims 1 to 9.

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