Heat exchangers and hot water plants

Abstract

The embodiment of the present invention provides a heat exchanger and a hot water device, wherein the heat exchanger comprises: a heat exchanger body, on which a water outlet is provided; a water outlet pipe, one end of which is connected to the water outlet, and a buffer portion is formed in the water outlet pipe, and the buffer portion is used to reduce the flow rate of the fluid from the water outlet. Through the technical solution of the present invention, the "temperature rise and temperature drop" situation that occurs when the user turns off the water and starts again can be significantly improved, the constant temperature performance of the hot water output can be maintained, and the user's experience is better; compared with the method of adding a bypass pipe to the heat exchanger or adding a bypass pipe to the water outlet, this technical solution has low cost and occupies little space.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of water heaters, and in particular to a heat exchanger and a water heater. Background Art

[0002] At present, the problem of "temperature rise and temperature drop" in the use of water heaters is quite common. After using up the hot water, the water flow is turned off, and the residual heat in the pipe will continue to heat the water in the pipe. When the water flow is started again, the water temperature of the water flowing out at the beginning will be higher than the temperature set by the user, which may scald the user, that is, "temperature rise" occurs; when hot water is needed, the water flow is started again, and the heating of the water heater takes a certain amount of time, so there will be a period of water that has not been heated in time and has a lower temperature flowing out, and the water temperature is significantly lower than the temperature set by the user, that is, "temperature drop" occurs.

[0003] In order to improve the current situation of "temperature rise and temperature drop", a bypass pipe is generally added to the heat exchanger or a bypass pipeline is added to the water outlet pipe, but the improvement effect is not obvious. Summary of the invention

[0004] In order to solve at least one of the above technical problems, an object of an embodiment of the present invention is to provide a heat exchanger.

[0005] Another object of an embodiment of the present invention is to provide a water heating device having the above-mentioned heat exchanger.

[0006] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention provides a heat exchanger, comprising: a heat exchanger body, on which a water outlet is provided; a water outlet pipe, one end of which is connected to the water outlet, and a buffer portion is formed in the water outlet pipe, and the buffer portion is used to reduce the flow rate of the fluid from the water outlet.

[0007] The heat exchanger provided by the present invention comprises a heat exchanger body and a water outlet pipe, wherein the water outlet is provided on the heat exchanger body, and one end of the water outlet pipe is connected to the water outlet. The water outlet can be provided on the top, bottom or side of the heat exchanger. The water outlet pipe can be a hard pipe or a soft pipe, and the water outlet pipe should be made of a high temperature resistant material.

[0008] Furthermore, a buffer portion is formed in the water outlet pipe, and the flow velocity of the fluid will be reduced when it flows through the buffer portion. When the user needs to use hot water, the water is first heated by the heat exchanger, and then the water flow is started. At this time, part of the water in the water outlet pipe has not been heated in time and has a lower temperature, and part of the water has been heated in the heat exchanger and has a higher temperature. The two water flows are preliminarily mixed in the water outlet pipe. When flowing through the buffer part, the flow rate is reduced and the time to flow out of the water outlet is increased. Therefore, the two water flows can be further mixed in the buffer part, and the temperature of the higher temperature water flow is neutralized by the lower temperature water flow. Because the lower temperature water flow only accounts for a small part, this part of the water flow can be quickly raised by the high-temperature water flow that flows out of the heat exchanger and is fully heated. Therefore, the water temperature of the mixed water flow flowing out of the water outlet at this time may be slightly lower than the user's preset temperature in an instant, and then the water temperature reaches the preset temperature in a very short time, that is, the user has experienced a process of "temperature drop first and then temperature rise", but by setting the buffer part, the amplitude range below the preset temperature will be significantly reduced and the time to reach the preset temperature will be significantly shortened; after using up the hot water, such as taking a hot bath, the water flow Shut down, because the hot water has just been used, the high-temperature water flow raises the temperature of the water outlet pipe through heat transfer. After the water flow is shut down, the water flow entering the water outlet pipe again will also be raised in temperature through heat transfer under the residual heat of the water outlet pipe. After the water flow is started again, there are two parts of water flow in the water outlet pipe at this time, one part of the water flow is at a higher temperature, and the other part is later entering the water outlet pipe with a lower temperature. The two parts of water flow will be preliminarily mixed and the temperature will be neutralized. After the two water flows pass through the buffer part, the flow rate is reduced, which prolongs the time of movement in the water outlet pipe and can be further mixed. Since this high-temperature water flow only accounts for a small part, this part of the water flow can be quickly lowered by the low-temperature water flow that continuously enters the water outlet pipe. Therefore, the water temperature of the mixed water flow flowing out of the water outlet at this time may be slightly higher than the user's preset temperature in an instant, and then it will quickly return to the user's preset temperature, that is, the user has experienced a process of "temperature rise first and then temperature drop". By setting the buffer part, the amplitude range initially higher than the preset temperature will be significantly reduced and the time to return to the preset temperature will also be significantly shortened.

[0009] In summary, by setting up a buffer part, the "temperature rise and drop" situation that occurs when the user turns off the water and starts it again can be significantly improved, the constant temperature performance of the hot water can be maintained, and the user experience is better; compared with adding a bypass pipe to the heat exchanger or adding a bypass pipe to the water outlet pipe, this technical solution has low cost and occupies little space.

[0010] In addition, the above technical solution provided by the present invention may also have the following additional technical features:

[0011] In the above technical solution, the water outlet pipe includes: a water receiving section, which is connected to the water outlet, and the diameter of the water receiving section is the same as the diameter of the water outlet; an expansion section, which is connected to the water receiving section, and the diameter of the expansion section is larger than the diameter of the water receiving section; a connecting section, which is connected to the expansion section, and the water flowing out of the water outlet is discharged outward after passing through the water receiving section, the expansion section and the connecting section in sequence, wherein the expansion section forms a buffer portion.

[0012] In this technical solution, the water outlet pipe includes a water receiving section, a pipe expansion section and a connecting section. The water receiving section is connected to the water outlet, and the water receiving section and the water outlet can be fixedly connected or detachably connected, and the detachable connection method can be a threaded connection, a snap connection, etc. The pipe diameter of the water receiving section is the same as the diameter of the water outlet, so that the flow rate of the fluid at the water outlet is consistent with the flow rate of the fluid at the water receiving section. The pipe expansion section is connected to the water receiving section, and the connecting section is connected to the pipe expansion section. Water flows through the water receiving section, the pipe expansion section and the connecting section in turn and is discharged outward. The water receiving section, the pipe expansion section and the connecting section can all be detachably connected, which is convenient for installation and disassembly of one of the components, that is, easy to replace; or they can all be fixedly connected together, that is, the three are integrally cast and formed, which is convenient for processing.

[0013] Furthermore, the diameter of the expansion section is larger than the diameter of the water receiving section, and the velocity of the fluid in the outlet pipe will decrease when it flows through the expansion section, thereby forming a buffer section at the expansion section. The velocity of the water flowing through the expansion section will decrease, which prolongs the time for the water to be discharged from the outlet. The water with a higher temperature can be well mixed with the water with a lower temperature, and the temperature is neutralized before being discharged to the outlet. Because the diameter of the expansion section is larger than the diameter of the water receiving section, the volume of the expansion section is larger than that of the water receiving section of the same length, so that the water with a higher temperature and the water with a lower temperature are initially mixed in the water receiving section, and then the flow through the expansion section not only decreases in velocity but also increases in mixing space, so that the two water streams can be fully mixed to neutralize the temperature, thereby significantly improving the "temperature rise and temperature drop" situation.

[0014] It should be further explained that the pipe diameter of the connecting section can be smaller than the pipe diameter of the expansion section, that is, the water flow can be changed back to a normal flow rate for users after being mixed in the expansion section and then flowing through the connecting section; the pipe diameter of the connecting section can also be equal to or larger than the pipe diameter of the expansion section, that is, the connecting section also forms a buffer section, and the flow rate of water can be reduced when passing through the expansion section and the connecting section, extending the time for water to be discharged from the outlet pipe, thereby better mixing the water flow and neutralizing the temperature.

[0015] Among them, it should be noted that the buffer section and the water outlet must be connected to a water connecting section, that is, the water flowing out of the water outlet needs to pass through a normal pipeline before it can flow into the buffer section. Of course, the closer the buffer section is to the water outlet, the better the buffering effect, which can better neutralize the high-temperature water in the heat exchanger when the water is turned off in the middle.

[0016] In the above technical solution, there are multiple pipe expansion sections, and two adjacent pipe expansion sections are connected via a connecting section.

[0017] In this technical solution, there are multiple expansion sections. By setting up multiple expansion sections, the water flow can be gradually mixed each time it passes through an expansion section, so that the water flow with higher temperature and the water flow with lower temperature can better neutralize the temperature, and the mixed water flow can be closer to the user's preset temperature when discharged out of the outlet pipe.

[0018] Furthermore, two adjacent expansion sections are connected by a connecting section. The connection between the connecting section and the expansion section can be a fixed connection or a detachable connection. The detachable connection can be a threaded connection, a snap connection, etc. The number of expansion sections is determined based on the space size or other actual conditions.

[0019] In addition, the pipe diameter of the connecting section can be smaller than, equal to or larger than the pipe diameter of the expanding section. When the pipe diameter of the connecting section is smaller than the pipe diameter of the expanding section, the water flow velocity decreases each time it passes through the expanding section, and the water flow velocity increases each time it passes through the connecting section. By controlling the speed of the water flow, the water flow with a higher temperature can be better mixed with the water flow with a lower temperature. When the pipe diameter of the connecting section is equal to or larger than the pipe diameter of the expanding section, a buffer portion is formed in the connecting section, so that the flow velocity of the water flow with a temperature difference in the expanding section and the connecting section will be reduced, so that it can be fully mixed and the temperature can be neutralized.

[0020] Specifically, the pipe diameters of multiple expanded pipe sections can be the same, that is, the models can be consistent, which is easy to process and more convenient to repair and replace; the pipe diameters of multiple expanded pipe sections can also be different, and the pipe diameters gradually decrease. Two water flows with a temperature difference will be mixed each time they flow through an expanded pipe section. Since the pipe diameter gradually decreases, the change in water temperature will also approximately form a step constant temperature.

[0021] In the above technical solution, the water receiving section, the pipe expansion section and the connecting section are integrally formed.

[0022] In this technical solution, the water receiving section, the pipe expansion section and the connecting section are cast in one piece, so that the installation is faster and water leakage at the connection between the three sections is avoided.

[0023] In addition, after one-piece molding, there is no need for separate assembly, no additional assembly steps, a smaller volume, and a lower cost than adding an additional water tank.

[0024] In the above technical solution, both ends of the expanded pipe section are detachably connected to the water receiving section and the connecting section respectively.

[0025] In this technical solution, both ends of the expanded pipe section are detachably connected to the water receiving section and the connecting section, so that the number of expanded pipe sections can be flexibly set and the expanded pipe sections can be easily replaced and repaired.

[0026] In the above technical solution, the diameters of the expanded pipe sections are the same, and transition pipe sections are provided at both ends of the expanded pipe sections, and the inner diameter of the transition pipe sections gradually decreases in the direction from the expanded pipe section to the outside.

[0027] In this technical solution, the diameters of the expanded pipe sections are the same, so the diameters of the expanded pipe sections are consistent, that is, the models are the same, which is convenient for processing and more convenient for maintenance and replacement. The transition pipe sections are arranged at both ends of the expanded pipe section and the inner diameter gradually decreases from the expanded pipe section to the outside. By arranging the transition pipe sections, the flow velocity of the water flow can be gradually changed when it flows through the expanded pipe section.

[0028] In the above technical solution, the number of the expanded pipe section is at least one, and the ratio of the sum of the lengths of all the expanded pipe sections to the length of the water outlet pipe is 10% to 90%.

[0029] In this technical solution, the number of expanded pipe sections can be one or more, which can be flexibly set according to the buffering requirements during actual use. Furthermore, by limiting the ratio of the length of the expanded pipe section to the length of the outlet pipe to 10% to 90%, the buffering effect can be greatly improved.

[0030] In the above technical solution, the ratio of the maximum diameter of the expanded section to the diameter of the connecting section is 1.5-5; and / or the ratio of the maximum diameter of the expanded section to the diameter of the water receiving section is 1.5-5.

[0031] In this technical solution, by limiting the maximum pipe diameter of the expanded pipe section to 1.5 to 5 times that of the connecting section, it can be flexibly selected according to the actual use space and buffering requirements to improve the user experience. It can be understood that the larger the pipe diameter, the better the buffering effect, but it inevitably occupies more space. Similarly, by limiting the maximum pipe diameter of the expanded pipe section to 1.5 to 5 times that of the water receiving section, it can also be flexibly selected according to the actual use space and buffering requirements to improve the user experience.

[0032] In the above technical solution, a water inlet is provided on the heat exchanger body, and the heat exchanger further comprises: a water inlet pipe, one end of which is connected to the water inlet.

[0033] In this technical solution, the water inlet can be arranged at the top, top and side of the heat exchanger body. In addition, the heat exchanger also includes a water inlet pipe and one end of the water inlet pipe is connected to the water inlet. The water inlet pipe and the water inlet can be fixedly connected or detachably connected. The detachable connection method is threaded connection, snap connection, etc.

[0034] Furthermore, the water inlet pipe can be a hose or a hard pipe.

[0035] In the above technical solution, the water inlet and the water outlet are respectively arranged on both sides of the heat exchanger body.

[0036] In this technical solution, the water inlet and the water outlet are arranged on both sides of the heat exchanger, so that after the water flows into the heat exchanger body through the water inlet, it can be fully heated by the heat exchanger body and then flow out of the water outlet.

[0037] An embodiment of the second aspect of the present invention provides a water heating device, comprising: a shell, in which a burner is arranged; a heat exchanger, which is arranged in the shell, and the burner can heat the heat exchanger.

[0038] According to an embodiment of the water heating device of the present invention, the water heating device includes a shell and a heat exchanger, and the burner and the heat exchanger are both arranged inside the shell. The heat exchanger is heated by the burner, so that water first flows into the interior of the heat exchanger body through the water inlet, and then the water inside the heat exchanger body is heated by the burner, and then can flow out from the water outlet for use.

[0039] The heat exchanger may be located above, below or to the side of the burner.

[0040] In the above technical solution, the hot water device also includes: a mixing valve, one end of which is connected to the water outlet pipe of the heat exchanger; a cold water pipe, which is connected to the other end of the mixing valve, and the mixing valve can adjust the flow ratio of the water outlet pipe and the cold water pipe.

[0041] In this technical solution, the hot water device also includes a mixing valve and a cold water pipe. The two ends of the mixing valve are respectively connected to the cold water pipe and the water outlet pipe. By setting the mixing valve, the flow ratio of the water outlet pipe and the cold water pipe can be adjusted. The user can set a preset temperature, and the mixing valve will adjust the flow ratio of the water outlet pipe and the cold water pipe to flow out water of corresponding temperature.

[0042] The embodiment of the water heating device provided by the present invention has all the above beneficial effects because it is provided with the heat exchanger in any of the above technical solutions, which will not be described in detail here.

[0043] Additional aspects and advantages of embodiments of the present invention will become apparent in the following description or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic structural diagram of a heat exchanger according to an embodiment of the present invention is shown;

[0045] Figure 2 A schematic structural diagram of a heat exchanger according to another embodiment of the present invention is shown;

[0046] Figure 3 A schematic structural diagram of a water outlet pipe according to an embodiment of the present invention is shown;

[0047] Figure 4 A schematic structural diagram of a water outlet pipe according to another embodiment of the present invention is shown;

[0048] Figure 5 A schematic structural diagram of a water outlet pipe according to another embodiment of the present invention is shown;

[0049] Figure 6 A schematic structural diagram of a heat exchanger according to another embodiment of the present invention is shown;

[0050] Figure 7 A schematic structural diagram of a heat exchanger according to another embodiment of the present invention is shown;

[0051] Figure 8 A schematic structural diagram of a water heating device according to an embodiment of the present invention is shown.

[0052] in, Figures 1 to 8 The corresponding relationship between the reference numerals and the component names is as follows:

[0053] 1: heat exchanger body; 2: water inlet; 3: water inlet pipe; 4: water outlet; 5: water outlet pipe; 51: water receiving section; 52: pipe expansion section; 53: connecting section; 54: transition pipe section; 6: shell; 7: burner; 8: mixing valve; 9: cold water pipe. DETAILED DESCRIPTION

[0054] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0055] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0056] Refer to the following Figures 1 to 8 A heat exchanger and a water heater according to some embodiments of the present invention are described.

[0057] Embodiment 1

[0058] like Figure 1As shown, a heat exchanger provided by an embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0059] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0060] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0061] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0062] In another embodiment, the water inlet 2 is disposed on the top of the heat exchanger body 1 or at other locations.

[0063] In another embodiment, the water outlet 4 is disposed at the bottom of the heat exchanger body 1 or at other locations.

[0064] In another embodiment, the water outlet pipe 5 and the water outlet 4 are detachably connected, and the detachable connection is in the form of a threaded connection, a snap connection, or the like.

[0065] In another embodiment, the water inlet pipe 3 and the water inlet 2 are detachably connected, and the detachable connection is in the form of a threaded connection, a snap connection, or the like.

[0066] In another embodiment, the water inlet pipe 3 is a hose with a larger movable range.

[0067] In another embodiment, the water outlet pipe 5 is a hose with a larger movable range.

[0068] Embodiment 2

[0069] like Figure 2 As shown, a heat exchanger provided by an embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on the same side of the heat exchanger body 1.

[0070] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0071] This can save space and is suitable for small space layout.

[0072] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0073] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0074] Embodiment 3

[0075] like Figure 1 As shown, a heat exchanger provided by an embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0076] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0077] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0078] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0079] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0080] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameters of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section, and the diameters of the water receiving section 51 and the connecting section 53 are the same, that is, the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the water receiving section. Therefore, when the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula that the flow rate is equal to the cross-sectional area multiplied by the speed, the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. Furthermore, because, when the diameter of the expanded pipe section 52 increases, the expanded pipe section 52 has a larger volume than the water receiving section 51 and the connecting section 53 of the same length, it can not only reduce the flow rate but also enable the two water flows with a large temperature difference to be fully mixed in a larger space and the temperature to be neutralized.

[0081] Specifically, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are all fixedly connected, that is, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are integrally formed, do not need to be assembled separately, do not increase the assembly process, occupy a smaller volume, and the cost will be lower than adding an additional water tank.

[0082] In another embodiment, the water receiving section 51 and the pipe expansion section 52 are detachably connected, and the detachable connection is in the form of a threaded connection, a snap connection, or the like.

[0083] In another embodiment, the expansion section 52 and the connection section 53 are detachably connected, and the detachable connection is in the form of a threaded connection, a snap connection, or the like.

[0084] Embodiment 4

[0085] A heat exchanger provided by one embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0086] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0087] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0088] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0089] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0090] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameter of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section. When the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula, the flow rate is equal to the cross-sectional area multiplied by the speed, so the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the water outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. In addition, because the expanded pipe section 52 has a larger volume than the water receiving section 51 and the connecting section 53 of the same length when the diameter of the expanded pipe section 52 increases, it can not only reduce the flow rate but also make the two water flows with a large temperature difference fully mixed in a larger space and neutralize the temperature.

[0091] Furthermore, if Figure 3 As shown, the diameter of the connecting section 53 is smaller than the diameter of the water receiving section 51. At this time, the diameter of the connecting section 53 is smaller than the expansion section 52. When the fluid flows through the expansion section 52 with a larger diameter, the flow rate decreases, and when the fluid flows through the connecting section 53 with a smaller diameter, the flow rate increases. By controlling the flow rate, the two water flows with a large temperature difference can be better mixed and the temperature can be neutralized.

[0092] Specifically, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are all fixedly connected, that is, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are integrally formed, do not need to be assembled separately, do not increase the assembly process, occupy a smaller volume, and the cost will be lower than adding an additional water tank.

[0093] Embodiment 5

[0094] A heat exchanger provided by one embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0095] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0096] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0097] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0098] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0099] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameter of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section. When the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula, the flow rate is equal to the cross-sectional area multiplied by the speed, so the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the water outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. In addition, because the expanded pipe section 52 has a larger volume than the water receiving section 51 and the connecting section 53 of the same length when the diameter of the expanded pipe section 52 increases, it can not only reduce the flow rate but also make the two water flows with a large temperature difference fully mixed in a larger space and neutralize the temperature.

[0100] Furthermore, if Figure 4As shown, the diameter of the connecting section 53 is larger than the diameter of the water receiving section 51 but smaller than the diameter of the expanding section 52. At this time, the diameter of the connecting section 53 is smaller than that of the expanding section 52. When the fluid flows through the expanding section 52 with a larger diameter, the flow rate decreases, and when the fluid flows through the connecting section 53 with a smaller diameter, the flow rate increases. By controlling the flow rate, the two water flows with a large temperature difference can be better mixed and the temperature can be neutralized.

[0101] Specifically, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are all fixedly connected, that is, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are integrally formed, do not need to be assembled separately, do not increase the assembly process, occupy a smaller volume, and the cost will be lower than adding an additional water tank.

[0102] Embodiment 6

[0103] A heat exchanger provided by one embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0104] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0105] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0106] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0107] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0108] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameter of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section. When the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula, the flow rate is equal to the cross-sectional area multiplied by the speed, so the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the water outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. In addition, because the expanded pipe section 52 has a larger volume than the water receiving section 51 of the same length when the diameter of the expanded pipe section 52 increases, it can not only reduce the flow rate but also make the two water flows with a large temperature difference fully mixed in a larger space and neutralize the temperature.

[0109] Furthermore, if Figure 5 As shown, the diameter of the connecting section 53 is not less than the diameter of the expanding section 52, that is, the diameter of the connecting section 53 can be equal to or larger than the diameter of the expanding section 52, and thus the connecting section 53 can also form a buffer portion, and the two water flows with a temperature difference can be further mixed and the temperature can be neutralized when flowing through the expanding section 52 and the connecting section 53.

[0110] Specifically, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are all fixedly connected, that is, the water receiving section 51, the pipe expansion section 52 and the connecting section 53 are integrally formed, do not need to be assembled separately, do not increase the assembly process, occupy a smaller volume, and the cost will be lower than adding an additional water tank.

[0111] Embodiment 7

[0112] like Figure 6 As shown, a heat exchanger provided by an embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0113] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0114] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0115] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0116] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0117] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameters of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section, and the diameters of the water receiving section 51 and the connecting section 53 are the same, that is, the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the water receiving section. Therefore, when the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula that the flow rate is equal to the cross-sectional area multiplied by the speed, the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. Furthermore, because, when the diameter of the expanded pipe section 52 increases, the expanded pipe section 52 has a larger volume than the water receiving section 51 and the connecting section 53 of the same length, it can not only reduce the flow rate but also enable the two water flows with a large temperature difference to be fully mixed in a larger space and the temperature to be neutralized.

[0118] Furthermore, two expansion sections 52 are provided, and the two expansion sections 52 are connected via a connecting section 53 .

[0119] Furthermore, the two expanded pipe sections 52 have the same pipe diameter. Since the two expanded pipe sections 52 have the same pipe diameter size, that is, the same model, the expanded pipe sections 52 are not only more convenient to process, but also more convenient to install or replace.

[0120] Embodiment 8

[0121] like Figure 7 As shown, a heat exchanger provided by an embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0122] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0123] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0124] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0125] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0126] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameters of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section, and the diameters of the water receiving section 51 and the connecting section 53 are the same, that is, the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the water receiving section. Therefore, when the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula that the flow rate is equal to the cross-sectional area multiplied by the speed, the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. Furthermore, because, when the diameter of the expanded pipe section 52 increases, the expanded pipe section 52 has a larger volume than the water receiving section 51 and the connecting section 53 of the same length, it can not only reduce the flow rate but also enable the two water flows with a large temperature difference to be fully mixed in a larger space and the temperature to be neutralized.

[0127] Furthermore, two expansion sections 52 are provided, and the two expansion sections 52 are connected via a connecting section 53 .

[0128] Furthermore, the two expansion sections 52 have different diameters. When the fluid flows through the two expansion sections 52 with different diameters, the flow rate will be different. Therefore, when two water flows with temperature difference flow through the two expansion sections 52 with different diameters, they can be mixed to different degrees, and the temperature can be better neutralized.

[0129] Embodiment 9

[0130] A heat exchanger provided by one embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0131] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0132] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0133] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0134] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0135] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameters of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section, and the diameters of the water receiving section 51 and the connecting section 53 are the same, that is, the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the water receiving section. Therefore, when the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula that the flow rate is equal to the cross-sectional area multiplied by the speed, the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. Furthermore, because, when the diameter of the expanded pipe section 52 increases, the expanded pipe section 52 has a larger volume than the water receiving section 51 and the connecting section 53 of the same length, it can not only reduce the flow rate but also enable the two water flows with a large temperature difference to be fully mixed in a larger space and the temperature to be neutralized.

[0136] Furthermore, a plurality of expansion sections 52 are provided, and two adjacent expansion sections 52 are connected via a connecting section 53. The diameters of the expansion sections 52 may be the same or different.

[0137] Embodiment 10

[0138] like Figure 1 As shown, a heat exchanger provided by an embodiment of the present invention comprises: a heat exchanger body 1, a water inlet 2, a water outlet 4, a water inlet pipe 3 and a water outlet pipe 5. The water inlet 2 and the water outlet 4 are both arranged on the heat exchanger body 1 and are respectively arranged on both sides of the heat exchanger body 1, the water inlet 2 is arranged at a position close to the bottom of one side of the heat exchanger body 1, and the water outlet 4 is arranged at a position close to the top of the other side of the heat exchanger body 1, so that after the water flows into the heat exchanger body 1 through the water inlet 2, the water flow with a high water level will preferentially flow out from the water outlet 4.

[0139] In addition, the water inlet pipe 3 is connected to the water inlet 2 in a fixed connection manner; the water outlet pipe 5 is connected to the water outlet 4 in a fixed connection manner.

[0140] Furthermore, a buffer portion is formed in the water outlet pipe 5 , and the buffer portion can reduce the flow rate of the fluid from the water outlet 4 .

[0141] It should be noted that the water outlet pipe 5 and the water inlet pipe 3 are both hard pipes with relatively high strength. The water outlet pipe 5 is made of high temperature resistant material.

[0142] Furthermore, the water outlet pipe 5 includes a water receiving section 51, a pipe expansion section 52 and a connecting section 53. One end of the water receiving section 51 is connected to the water outlet pipe 5, the other end of the water receiving section 51 is connected to one end of the pipe expansion section 52, and the other end of the pipe expansion section 52 is connected to the connecting section 53, so that the water flowing out of the water outlet 4 flows through the water receiving section 51, the pipe expansion section 52 and the connecting section 53 in sequence and then is discharged outward.

[0143] Furthermore, the diameter of the expanded pipe section 52 is larger than the diameters of the water receiving section 51 and the connecting section 53, and the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the connecting section, and the diameters of the water receiving section 51 and the connecting section 53 are the same, that is, the maximum diameter of the expanded pipe section is 1.5 to 5 times the diameter of the water receiving section. Therefore, when the water flows through the expanded pipe section 52, due to the increase in the diameter, the area of ​​the cross section of the expanded pipe section 52 perpendicular to the axis is larger than the area of ​​the cross section of the water receiving section 51 perpendicular to the axis. When the flow rate of the water flow remains unchanged, according to the formula that the flow rate is equal to the cross-sectional area multiplied by the speed, the flow rate of the water flow in the expanded pipe section 52 will slow down, that is, the expanded pipe section 52 forms a buffer, thereby extending the time for the water flow to flow out of the outlet pipe 5, so that the water flow with a higher temperature can be further mixed with the water flow with a lower temperature. Furthermore, because, when the diameter of the expanded pipe section 52 increases, the expanded pipe section 52 has a larger volume than the water receiving section 51 and the connecting section 53 of the same length, it can not only reduce the flow rate but also enable the two water flows with a large temperature difference to be fully mixed in a larger space and the temperature to be neutralized.

[0144] Furthermore, transition sections 54 are provided at both ends of the expansion section 52, and the inner diameter of the transition section 54 gradually changes from the expansion section 52 to the outside. By providing the transition section 54, the flow velocity of the fluid flowing through the expansion section 52 is gradually changed, and the aesthetics is improved.

[0145] Embodiment 11

[0146] like Figure 8 As shown, the hot water device provided in this embodiment includes a housing 6, a burner 7, the heat exchanger in the above scheme, a mixing valve 8 and a cold water pipe 9. The heat exchanger and the burner 7 are both arranged inside the housing 6 and the heat exchanger is arranged above the burner 7, and the heat exchanger is heated by the burner 7. In addition, the two ends of the mixing valve 8 are respectively connected to the cold water pipe 9 and the outlet pipe 5 of the heat exchanger, and the mixing valve 8 can adjust the flow ratio of the outlet pipe 5 and the cold water pipe 9.

[0147] In another embodiment, the heat exchanger is located below or at the side of the burner 7 and can be flexibly arranged according to actual conditions.

[0148] The water heating device provided in this embodiment has all the above beneficial effects because it is provided with the heat exchanger in any of the above embodiments, which will not be described in detail here.

[0149] According to the embodiments of the heat exchanger and the hot water device of the present invention, by arranging an expansion section on the water outlet pipe, the "temperature rise and temperature drop" situation that occurs when the user turns off the water and starts it again can be significantly improved, the constant temperature performance of the hot water output can be maintained, and the user's experience is better; compared with the method of adding a bypass pipe to the heat exchanger or adding a bypass pipe to the water outlet pipe, this technical solution has low cost and occupies little space.

[0150] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0151] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0152] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0153] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat exchanger, characterized in that: include: A heat exchanger body, wherein a water outlet and a water inlet are provided on the heat exchanger body, wherein the water inlet and the water outlet are respectively arranged on both sides of the heat exchanger body, wherein the water inlet is arranged at a position close to the bottom on one side of the heat exchanger body, and the water outlet is arranged at a position close to the top on the other side of the heat exchanger body; a water outlet pipe, one end of which is connected to the water outlet, a buffer portion being formed inside the water outlet pipe, the buffer portion being used to reduce the flow rate of the fluid from the water outlet; The water outlet pipe comprises: A water receiving section is connected to the water outlet, and the diameter of the water receiving section is the same as the diameter of the water outlet; an expanded pipe section connected to the water receiving section, and the pipe diameter of the expanded pipe section is larger than the pipe diameter of the water receiving section; The connecting section is connected to the expansion section, and the water flowing out through the water outlet is discharged outward after passing through the water receiving section, the expansion section and the connecting section in sequence. The pipe diameter of the connecting section is larger than the pipe diameter of the water receiving section and smaller than the pipe diameter of the expanding section; Wherein, the expanded pipe section forms the buffer portion; There are multiple pipe expansion sections, and two adjacent pipe expansion sections are connected via one connecting section.

2. The heat exchanger according to claim 1, characterized in that The water receiving section, the pipe expansion section and the connecting section are integrally formed.

3. The heat exchanger according to claim 1, characterized in that The two ends of the expanded pipe section are detachably connected to the water receiving section and the connecting section respectively.

4. The heat exchanger according to claim 1, characterized in that The pipe diameters of the expanded pipe sections are the same, and transition pipe sections are respectively provided at both ends of the expanded pipe sections, and the inner diameter of the transition pipe sections gradually decreases in the direction from the expanded pipe sections to the outside.

5. The heat exchanger according to claim 1, characterized in that The number of the expanded pipe section is at least one, and the ratio of the sum of the lengths of all the expanded pipe sections to the length of the water outlet pipe is 10% to 90%.

6. The heat exchanger according to claim 1, characterized in that The ratio of the maximum diameter of the expansion section to the diameter of the connection section is 1.5 to 5; and / or The ratio of the maximum pipe diameter of the expanded pipe section to the pipe diameter of the water receiving section is 1.5-5.

7. The heat exchanger according to any one of claims 1 to 6, characterized in that The heat exchanger also includes: A water inlet pipe, one end of which is connected to the water inlet.

8. A water heating device, characterized in that: include: a shell, wherein a burner is arranged in the shell; The heat exchanger according to any one of claims 1 to 7 is arranged in the housing, and the burner is capable of heating the heat exchanger.

9. The water heater according to claim 8, characterized in that: Also includes: A water mixing valve, one end of which is connected to the water outlet pipe of the heat exchanger; A cold water pipe is connected to the other end of the mixing valve. Wherein, the water mixing valve can adjust the flow ratio of the water outlet pipe and the cold water pipe.

Images