Heat exchanger bypass structure and gas water heater

Abstract

The heat exchanger bypass structure comprises a heat exchange assembly, a connecting pipe and a bypass pipe, the heat exchange assembly comprises a first heat exchange pipe and a second heat exchange pipe, one end of the first heat exchange pipe is provided with a cold water inlet end used for inputting cold water, and the other end of the first heat exchange pipe is provided with a cold water outlet end used for inputting cold water. The cold water inlet end is connected and communicated with an external water inlet pipeline through a cold water inlet pipe; one end of the connecting pipe is communicated with the other end of the first heat exchange pipe, and the other end of the connecting pipe is communicated with the other end of the second heat exchange pipe; wherein one end of the bypass pipe is connected and communicated with the cold water inlet pipe, and the other end of the bypass pipe is connected and communicated with the connecting pipe. Therefore, the cold water inlet pipe is communicated with the connecting pipe through the bypass pipe, so that cold water in the cold water inlet pipe is shunted, and hot water from the first heat exchange pipe and the cold water from the bypass pipe are converged in the connecting pipe to be neutralized and then enter the second heat exchange pipe; the water flow of the main water path of the heat exchanger is effectively prevented from being reduced, water in the second heat exchange pipe is effectively prevented from being vaporized, and dry burning and color changing of the second heat exchange pipe are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas water heaters, in particular to a heat exchanger bypass structure and a gas water heater. Background Art

[0002] Currently, a coil-less, single-layer tube-fin heat exchanger structure can effectively reduce the heat exchanger's size, making the internal components of the gas water heater more compact and reducing the overall size, thereby reducing the space occupied by the gas water heater. However, since this heat exchanger lacks a coil structure to absorb heat radiated from the combustion chamber, it relies solely on convection heat transfer between the high-temperature flue gas fins and heat exchange tubes to heat the cold water. This has certain limitations: the heat exchange tubes in the rear section of the heat exchanger may burn dry.

[0003] In the prior art, as disclosed in patent application No. 201810800581.5, a gas water heater with convenient adjustment of water inlet volume of the bypass pipe is disclosed. The bypass pipe is connected between the cold water pipe and the hot water pipe. In actual use, cold water will be diverted from the cold water pipe and directly neutralized with the hot water in the hot water pipe through the bypass pipe, reducing the water flow into the main water channel in the heat exchange tube. Under high-load combustion conditions, vaporization will occur in the heat exchange tube. Once vaporization occurs in the heat exchange tube, the air pressure in the heat exchange tube will gradually increase, forming a flow resistance to the main water channel in the heat exchange tube, thereby increasing the diversion volume of the bypass pipe and reducing the diversion volume of the main water channel in the heat exchange tube, further aggravating the vaporization state, causing the heat exchange tube to dry burn and discolor, accelerating the damage to the heat exchange tube, not only affecting the service life of the heat exchanger, but also generating a strong whistling noise. Utility Model Content

[0004] In order to overcome the defects of the above-mentioned prior art, the utility model provides a heat exchanger bypass structure and a gas water heater, which connects the cold water inlet pipe with the connecting pipe through a bypass pipe, so that the cold water in the cold water inlet pipe is divided, and the hot water from the first heat exchange pipe and the cold water from the bypass pipe are merged in the connecting pipe to achieve neutralization and then enter the second heat exchange pipe, thereby effectively preventing the water flow in the main water channel of the heat exchanger from being reduced and the water in the second heat exchange pipe from being vaporized, and avoiding dry burning and discoloration of the second heat exchange pipe.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A heat exchanger bypass structure, comprising:

[0007] The heat exchange assembly includes a first heat exchange tube and a second heat exchange tube. One end of the first heat exchange tube is provided with a cold water inlet for inputting cold water, and the cold water inlet is connected to an external water inlet pipe through a cold water inlet pipe; one end of the second heat exchange tube is provided with a hot water outlet for outputting hot water;

[0008] a connecting pipe, one end of which is connected to the other end of the first heat exchange pipe, and the other end of the connecting pipe is connected to the other end of the second heat exchange pipe;

[0009] Wherein, it also includes a bypass pipe, one end of which is connected to the cold water inlet pipe and the other end of which is connected to the connecting pipe.

[0010] Furthermore, the bypass pipe includes a first conduit arranged vertically, a second conduit arranged horizontally, and a third conduit in an arc shape;

[0011] One end of the first conduit is connected to the connecting pipe, and the other end of the first conduit is connected to one end of the third conduit; one end of the second conduit is connected to the cold water inlet pipe, and the other end of the second conduit is connected to the other end of the third conduit.

[0012] Furthermore, the cold water inlet pipe includes a first water inlet conduit and a second water inlet conduit, the first water inlet conduit is arranged horizontally and connected to the cold water inlet end, the second water inlet conduit is arranged vertically and connected to the first water inlet conduit, and one end of the second conduit is connected to the second water inlet conduit.

[0013] Furthermore, the specific heat capacity of water is c; the water flow rate of the second water inlet conduit is set to m, and the temperature is t0; the water flow rate of the first water inlet conduit is m1, and the temperature is t0; the water flow rate of the bypass pipe is m2, and the temperature is t0; the water flow rate after heating in the first heat exchange tube is m1, and the temperature is t1; the water flow rate flowing into the second heat exchange tube from the connecting tube is m, and the temperature is t2, which satisfies the following relationship: cm(t2-t0)=cm1(t1-t0).

[0014] Furthermore, the other end of the first heat exchange tube is provided with a water outlet, and the water outlet is provided with a first socket;

[0015] The other end of the second heat exchange tube is provided with a water inlet end, the water inlet end is provided with a second socket, one end of the connecting tube is provided with a first inserting tube, and the other end thereof is provided with a second inserting tube;

[0016] The first inserting pipe is inserted into the first socket, and the second inserting pipe is inserted into the second socket, so as to realize the connection and conduction between the connecting pipe and the water outlet and the water inlet.

[0017] Furthermore, one end of the connecting pipe is provided with a first limiting protrusion, and the other end of the connecting pipe is provided with a second limiting protrusion;

[0018] When the first inserting tube is inserted into the first socket and the second inserting tube is inserted into the second socket, the first limiting protrusion abuts against the first socket and the second limiting protrusion abuts against the second socket.

[0019] Furthermore, the cold water inlet pipe also includes a first bent pipe, one end of which is connected to the second water inlet conduit, and the other end of which is provided with a water inlet joint for connecting to an external water inlet pipeline.

[0020] Furthermore, the hot water outlet is connected to an external water outlet pipe through a hot water outlet pipe; the hot water outlet pipe includes a first water outlet conduit, a second water outlet conduit, and a second bent pipe, the first water outlet conduit is arranged horizontally and connected to the hot water outlet, and the second water outlet conduit is arranged vertically and connected to the first water outlet conduit;

[0021] One end of the second bent pipe is connected to the second water outlet conduit, and the other end of the second bent pipe is provided with a water outlet joint for connecting to an external water outlet pipeline.

[0022] Furthermore, the cold water inlet end is provided with a third socket, and the first water inlet conduit is plugged into the third socket to achieve connection and conduction with the cold water inlet end;

[0023] The hot water outlet is provided with a fourth socket, and the first water outlet conduit is plugged into the fourth socket to achieve connection and conduction with the hot water outlet.

[0024] A gas water heater comprises the heat exchanger bypass structure.

[0025] In summary, the present invention has the following technical effects:

[0026] The heat exchanger bypass structure and the gas water heater of the utility model are

[0027] 1. The heat exchanger bypass structure and gas water heater of the present invention connect the cold water inlet pipe with the connecting pipe through the bypass pipe, so that the cold water in the cold water inlet pipe is divided, and the hot water from the first heat exchange pipe and the cold water from the bypass pipe are merged in the connecting pipe to achieve neutralization before entering the second heat exchange pipe, thereby effectively preventing the water flow in the main water channel of the heat exchanger from being reduced and the water in the second heat exchange pipe from being vaporized, avoiding dry burning and discoloration of the second heat exchange pipe, which not only extends the service life of the heat exchanger, but also avoids the heat exchanger from generating strong whimpering noise, thereby improving the user experience.

[0028] 2. The heat exchanger bypass structure and gas water heater of the present invention include a first conduit connected to the connecting pipe, a second conduit connected to the cold water inlet pipe, and a third conduit in an arc shape connecting the first conduit and the second conduit, so that the first conduit and the second conduit form an arc transition and are respectively connected to the connecting pipe and the cold water inlet pipe, which can effectively reduce the diversion resistance of cold water in the cold water inlet pipe when entering the connecting pipe through the bypass pipe, improve the water flow convergence efficiency of the heat exchanger under large working conditions, and ensure that water flows smoothly into the second heat exchange pipe, thereby avoiding the reduction of water in the second heat exchange pipe and the vaporization during heating, and preventing the second heat exchange pipe from dry burning and discoloration. This not only ensures the stability of the heat exchanger and extends the service life of the gas water heater, but also effectively avoids the strong whistling noise caused by dry burning and discoloration, further improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of the heat exchanger bypass structure of the utility model;

[0030] Figure 2 This is a schematic structural diagram of the heat exchange component in the bypass structure of the heat exchanger of the present invention;

[0031] Figure 3 This is a schematic structural diagram of the connecting pipe in the bypass structure of the heat exchanger of the present invention;

[0032] Figure 4 This is a schematic structural diagram of the bypass pipe in the bypass structure of the heat exchanger of the present utility model;

[0033] Figure 5 This is a schematic structural diagram of the cold water inlet pipe in the bypass structure of the heat exchanger of the present invention;

[0034] Figure 6 This is a schematic structural diagram of the hot water outlet pipe in the bypass structure of the heat exchanger of the present invention;

[0035] Figure 7 This is a schematic structural diagram of the heat exchange fins in the bypass structure of the heat exchanger of the present invention;

[0036] Figure 8 This is a schematic diagram of the relationship between flow and temperature of the bypass structure of the heat exchanger of the present invention.

[0037] The meanings of the reference numerals are as follows:

[0038] 1. First heat exchange tube; 11. Cold water inlet; 111. Third socket; 12. Water outlet; 121. First socket; 2. Second heat exchange tube; 21. Water inlet; 211. Second socket; 22. Hot water outlet; 221. Fourth socket; 3. Connecting tube; 31. First insert; 311. First stopper; 32. Second insert; 321. Second stopper; 4. Bypass tube; 41. First conduit; 42. Second conduit; 43. Third conduit ; 5. Cold water inlet pipe; 51. First water inlet conduit; 52. Second water inlet conduit; 53. First bent pipe; 54. Water inlet joint; 6. Hot water outlet pipe; 61. First water outlet conduit; 62. Second water outlet conduit; 63. Second bent pipe; 64. Water outlet joint; 7. Heat exchange fins; 71. First through hole; 72. Second through hole; 73. First flange; 74. Second flange; 75. Protrusion; 76. Groove; 8. First connecting plate; 9. Second connecting plate. DETAILED DESCRIPTION

[0039] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the modules or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] like Figure 1-8 A heat exchanger bypass structure shown includes a heat exchange tube, a connecting tube 3 and a bypass tube 4. The heat exchange tube includes a first heat exchange tube 1 and a second heat exchange tube 2. One end of the first heat exchange tube 1 is provided with a cold water inlet end 11 for cold water input, and the cold water inlet end 11 is connected to the external water inlet pipeline through the cold water inlet pipe 5; one end of the second heat exchange tube 2 is provided with a hot water outlet end 22 for hot water output; one end of the connecting tube 3 is connected to the other end of the first heat exchange tube 1, and the other end of the connecting tube 3 is connected to the other end of the second heat exchange tube 2; wherein, one end of the bypass tube 4 is connected to the cold water inlet pipe 5, and the other end thereof is connected to the connecting tube 3.

[0043] Based on the above structure, the bypass pipe 4 connects the cold water inlet pipe 5 with the connecting pipe 3, and the connecting pipe 3 divides the cold water in the cold water inlet pipe 5 through the first heat exchange pipe 1 and the second heat exchange pipe 2, and merges the hot water from the first heat exchange pipe 1 and the cold water from the bypass pipe 4 in the connecting pipe 3 to achieve cold and hot neutralization before entering the second heat exchange pipe 2, thereby effectively preventing the main water flow of the heat exchanger entering the second heat exchange pipe 2 from being reduced and the water in the second heat exchange pipe 2 from being vaporized, so as to avoid dry burning and discoloration of the second heat exchange pipe 2. This not only extends the service life of the heat exchanger, but also avoids the heat exchanger from generating strong whimpering noise, thereby improving the user experience.

[0044] It should be noted that, in this embodiment, the first heat exchange tube 1, the second heat exchange tube 2 and the connecting tube 3 are all U-shaped tubes, and the connecting tube 3 is connected to the first heat exchange tube 1 and the second heat exchange tube 2 to form a serpentine tube, so as to extend the water flow path of the first heat exchange tube 1 and the second heat exchange tube 2, improve the heat absorption efficiency of the water in the first heat exchange tube 1 and the second heat exchange tube 2, thereby improving the heat exchange efficiency of the heat exchanger and ensuring the hot water output efficiency of the heat exchanger.

[0045] See Figure 4 The bypass pipe 4 includes a first conduit 41 arranged vertically, a second conduit 42 arranged horizontally, and a third conduit 43 in an arc shape; one end of the first conduit 41 is connected to the connecting pipe 3, and the other end of the first conduit 41 is connected to one end of the third conduit 43; one end of the second conduit 42 is connected to the cold water inlet pipe 5, and the other end of the second conduit 42 is connected to the other end of the third conduit 43.

[0046] Specifically, the second conduit 42 connected to the cold water inlet pipe 5 and the third conduit 43 in an arc shape connecting the first conduit 41 and the second conduit 42, so that the first conduit 41 and the second conduit 42 are connected in an arc transition and are respectively connected to the connecting pipe 3 and the cold water inlet pipe 5, can effectively reduce the diversion resistance when the cold water in the cold water inlet pipe 5 enters the connecting pipe 3 through the bypass pipe 4, improve the water flow convergence efficiency of the heat exchanger under large working conditions, and ensure that water flows smoothly into the second heat exchange tube 2, thereby avoiding the reduction of water in the second heat exchange tube 2 and the vaporization phenomenon during heating, preventing the second heat exchange tube 2 from dry burning and discoloration, not only ensuring the stability of the heat exchanger and extending the service life of the gas water heater, but also effectively avoiding the strong whistling noise caused by dry burning and discoloration, further improving the user experience.

[0047] Furthermore, the cold water inlet pipe 5 includes a first water inlet conduit 51 and a second water inlet conduit 52. The first water inlet conduit 51 is arranged horizontally and is connected to the cold water inlet end 11. The second water inlet conduit 52 is arranged vertically and is connected to the first water inlet conduit 51. One end of the second conduit 42 is connected to the second water inlet conduit 52.

[0048] Specifically, the bypass pipe 4 is connected to the vertically arranged second water inlet pipe 52 through the second pipe 42 to increase the water flow rate of the cold water inlet pipe 5 after the diversion at the connection between the second pipe 42 and the second water inlet pipe 52, so as to increase the water flow rate of the bypass pipe 4 and the main water channel of the first heat exchange pipe 1 after merging in the connecting pipe 3 and entering the second heat exchange pipe 2, thereby effectively avoiding a reduction in the water flow in the second heat exchange pipe 2, resulting in vaporization of the water in the second heat exchange pipe 2, and generating flow resistance to the water entering the second heat exchange pipe 2, thereby causing the risk of dry burning and discoloration in the second heat exchange pipe 2.

[0049] It should be noted that, in this embodiment, the first water inlet conduit 51 and the second water inlet conduit 52 are connected and communicated by an arc transition to reduce the flow resistance entering the main water channel in the first heat exchange tube 1, thereby avoiding the cold water in the first heat exchange tube 1 from being heated too quickly and without timely replenishment of cold water, resulting in vaporization in the first heat exchange tube 1 and an increase in gas pressure, forming water flow resistance and causing the risk of dry burning of the first heat exchange tube 1.

[0050] See Figure 8 In this embodiment, the diameter of the first heat exchange tube 1 and the second heat exchange tube 2 are both 13 mm, and the wall thickness is 0.7 mm. The cold water flow rate in the cold water inlet pipe 5 is defined as m, and the temperature is t0. The cold water is split at the connection between the second conduit 42 and the second water inlet conduit 52. The main water flow rate entering the first water inlet conduit 51 is m1, and the temperature is t0. The branch water flow rate entering the bypass pipe 4 from the second conduit 42 is m2 (i.e., m2=m-m1), and the temperature is t0. The main water flow in the first water inlet conduit 51 after passing through the first heat exchange tube 1 and being heated is m1, and the temperature is t1. The branch water flow between the main water flow and the bypass pipe 4 after being heated in the first heat exchange tube 1 is m1. After the two paths merge in the connecting pipe 3, the water flow rate entering the second heat exchange tube 2 is m, and the temperature is t2; according to the heat calculation formula: Q = c (specific heat capacity of water) m△t, the water temperature conversion relationship is: cm(t2-t0) = cm1(t1-t0), that is, after conversion t2 = [-cm1t0+cm1t1] / cm+t0 = (-m1t0+m1t1) / m+t0, it can be seen that the water temperature t2 after the merger is negatively correlated with the main water path flow rate m1, that is, the larger the bypass ratio, the smaller t2, but since a larger bypass ratio will affect the thermal efficiency of the heat exchanger, in this embodiment, the internal diameter of the bypass pipe 4 is D, and satisfies: 3mm≤D≤6mm.

[0051] It should be noted that, in this embodiment, refer to Figure 8 , the arrows indicate the direction of water flow.

[0052] See Figure 3 The other end of the first heat exchange tube 1 is provided with a water outlet end 12, and the water outlet end 12 is provided with a first socket 121; the other end of the second heat exchange tube 2 is provided with a water inlet end 21, and the water inlet end 21 is provided with a second socket 211. One end of the connecting tube 3 is provided with a first plug 31, and the other end thereof is provided with a second plug 32; the first plug 31 is inserted into the first socket 121, and the second plug 32 is inserted into the second socket 211, so as to realize the connection and conduction between the connecting tube 3 and the water outlet end 12 and the water inlet end 21.

[0053] Specifically, a first limiting protrusion 311 is further provided at one end of the connecting tube 3, and a second limiting protrusion 321 is further provided at the other end of the connecting tube 3; when the first insert tube 31 is inserted into the first socket 121 and the second insert tube 32 is inserted into the second socket 211, the first limiting protrusion 311 abuts against the first socket 121, and the second limiting protrusion 321 abuts against the second socket 211, so that the connection between the connecting tube 3 and the first heat exchange tube 1 and the second heat exchange tube 2 is more firmly established. It should be noted that, in other cases, the connecting tube 3 can be connected to the first heat exchange tube 1 and the second heat exchange tube 2 as a whole by welding.

[0054] See Figure 2 、 Figure 7 The heat exchange assembly also includes a plurality of heat exchange fins 7. A first connecting plate 8 is provided on one side of the first heat exchange tube 1 and the second heat exchange tube 2, and a second connecting plate 9 is provided on the other side. The plurality of heat exchange fins 7 are arranged between the first connecting plate 8 and the second connecting plate 9 along the length direction of the first heat exchange tube 1 and the second heat exchange tube 2.

[0055] Specifically, the heat exchange fin 7 is provided with a first through hole 71 for the first heat exchange tube 1 to pass through, and a second through hole 72 for the second heat exchange tube 2 to pass through. The heat exchange fin 7 is also provided with a first flange 73 and a second flange 74 for increasing the heat absorption area of the heat exchange fin 7 and located on both sides of the heat exchange fin 7, as well as a bump 75 and a groove 76 at the bottom and top of the heat exchange fin 7, respectively, to improve the heat exchange efficiency of the heat exchanger, improve the convective heat transfer of the high-temperature flue gas by the heat exchange fin 7, and thereby improve the heat exchange efficiency of the water flowing through the first heat exchange tube 1 and the second heat exchange tube 2.

[0056] It should be noted that, in this embodiment, the plurality of heat exchange fins 7 are arranged in a single layer on the first heat exchange tube 1 and the second heat exchange tube 2 .

[0057] See Figure 5The cold water inlet pipe 5 also includes a first bent pipe 53, one end of the first bent pipe 53 is connected to the second water inlet conduit 52, and the other end is provided with a water inlet connector 54 for connecting to an external water inlet pipeline.

[0058] See Figure 6 The hot water outlet end 22 is connected to the external water outlet pipe through the hot water outlet pipe 6; the hot water outlet pipe 6 includes a first water outlet conduit 61, a second water outlet conduit 62 and a second bent pipe 63. The first water outlet conduit 61 is arranged horizontally and is connected to the hot water outlet end 22, and the second water outlet conduit 62 is arranged vertically and is connected to the first water outlet conduit 61; one end of the second bent pipe 63 is connected to the second water outlet conduit 62, and the other end is provided with a water outlet connector 64 for connecting to the external water outlet pipe.

[0059] See also Figure 2 The cold water inlet end 11 is provided with a third socket 111, and the first water inlet pipe 51 is inserted into the third socket 111 to achieve connection and conduction with the cold water inlet end 11; the hot water outlet end 22 is provided with a fourth socket 221, and the first water outlet pipe 61 is inserted into the fourth socket 221 to achieve connection and conduction with the hot water outlet end 22.

[0060] See also Figure 8 Preferably, the first heat exchange tube 1 and the second heat exchange tube 2 are both U-shaped tubes with a diameter of 13 mm and a wall thickness of 0.7 mm. After the first heat exchange tube 1 and the second heat exchange tube 2 are heated and expanded, the outer diameters of the first heat exchange tube 1 and the second heat exchange tube 2 are both 14 mm; the diameter of the bypass tube 4 is 6 mm and the wall thickness is 0.5 mm; the inlet water temperature is defined as t0 = 25 ° C, the outlet water temperature is t4 = 65 ° C, and the inlet flow rate of the cold water inlet pipe 5 is m = 9 L / min; continuous combustion is carried out for 10 minutes under high load conditions, and the main water flow rate m1 entering the first heat exchange tube 1 after heating is The temperature of t1 is 53°C, and the temperature after mixing with the water flow m2 entering the connecting pipe 3 through the bypass pipe 4 is t2=44°C. The temperature of the mixed water when entering the second heat exchange tube 2 for heating is defined as t3, and t3=59°C. The outlet water temperature is adjusted to the set temperature t4=65°C to achieve hot water discharge through the hot water outlet pipe 6. Moreover, when the first heat exchange tube 1 and the second heat exchange tube 2 are continuously burned for 10 minutes under a high load state, no vaporization phenomenon or abnormal noise is generated. At the same time, no dry burning or discoloration is found in the first heat exchange tube 1 and the second heat exchange tube 2.

[0061] Based on the above-mentioned heat exchanger, the temperature rise after water outage is 3K to 4K; at the same time, as a comparison, the heat exchanger structure in the prior art, in which the cold water inlet pipe 5 and the hot water outlet pipe 6 are directly connected through the bypass pipe 4, and the heat exchanger structure with a single-layer heat exchange fin 7 and no bypass pipe are tested for temperature rise when water is outage. The temperature rise of the heat exchanger structure with a single-layer heat exchange fin 7 and no bypass pipe is 8K to 9K; the temperature rise of the heat exchanger structure in which the cold water inlet pipe 5 and the hot water outlet pipe 6 are directly connected through the bypass pipe 4 is 6K; therefore, the heat exchanger of the present application has a lower temperature rise and higher thermal efficiency by setting the bypass pipe 4, and the bypass pipe 4 connects the second water inlet conduit 52 with the connecting pipe 3.

[0062] It's important to note that the temperature rise indicator represents the extent to which the outlet water temperature rises above the set temperature after the water heater is restarted after a water heater is interrupted while operating at a constant temperature. The lower the temperature rise, the lower the outlet water temperature difference after the water heater is restarted, and the better the effect, preventing burns from sudden temperature increases. The standard stipulates that the temperature rise during water outages must not exceed 18K.

[0063] A gas water heater comprises the above-mentioned heat exchanger bypass structure.

[0064] Furthermore, the gas water heater of the present invention further includes a body and a burner arranged in the body, and the heat exchanger bypass structure is arranged in the body and located on the top of the burner.

[0065] When in use, cold water is input into the heat exchanger bypass structure through the external water inlet pipe connected to the water inlet joint 54, and hot water is output through the external water outlet pipe connected to the water outlet joint 64. Specifically, the burner is ignited to heat the first heat exchange tube 1, the second heat exchange tube 2 and the heat exchange fins 7. Cold water enters from the cold water inlet pipe 5 and is diverted at the connection between the second water inlet conduit 52 and the second conduit 42, forming a main water path that enters the first heat exchange tube 1 from the cold water inlet end 11 to achieve heating, and a diverted water path that enters the bypass pipe 4 from the second conduit 42 and passes into the connecting pipe 3, merging the hot water heated in the first heat exchange tube 1 and passing through the water outlet end 12 to achieve cold and hot neutralization, and then the neutralization is completed. The reconciled water is passed from the other end of the connecting pipe 3 into the water inlet end 21 of the second heat exchange tube 2, which effectively avoids the reduction of the water flow in the main water channel flowing through the second heat exchange tube 2, thereby causing the water in the second heat exchange tube 2 to vaporize and increase the air pressure in the second heat exchange tube 2, resulting in flow resistance to the main water channel entering the second heat exchange tube 2, causing the second heat exchange tube 2 to dry out and discolor, thereby improving the stability of the heat exchange tube and extending the service life of the heat exchanger; the water merged in the connecting pipe 3 is passed into the second heat exchange tube 2 to be heated again to form hot water, which is passed from the hot water outlet end 22 into the hot water outlet pipe 6 to flow through the external outlet pipe through the outlet joint 64 for user use.

[0066] To sum up, the heat exchanger bypass structure and gas water heater of the present invention connect the cold water inlet pipe 5 with the connecting pipe 3 through the bypass pipe 4, so that the cold water in the cold water inlet pipe 5 is divided, and the hot water from the first heat exchange pipe 1 and the cold water from the bypass pipe 4 are merged in the connecting pipe 3 to achieve cold and heat neutralization before entering the second heat exchange pipe 2, thereby effectively preventing the main water flow of the second heat exchange pipe 2 in the heat exchanger from being reduced and the water in the second heat exchange pipe 2 from being vaporized, avoiding dry burning and discoloration of the second heat exchange pipe 2, which not only extends the service life of the heat exchanger, but also avoids the heat exchanger from generating strong whimpering noise, thereby improving the user experience.

[0067] The heat exchanger bypass structure and gas water heater of the present invention include a first conduit 41 connected to the connecting pipe 3, a second conduit 42 connected to the second water inlet conduit 52, and a third conduit 43 in an arc shape connecting the first conduit 41 and the second conduit 42, so that the first conduit 41 and the second conduit 42 are connected in an arc transition and are respectively connected to the connecting pipe 3 and the second water inlet conduit 52, which can effectively reduce the diversion resistance of the cold water in the second water inlet conduit 52 when entering the connecting pipe 3 through the bypass pipe 4, improve the water flow merging efficiency of the heat exchanger under large working conditions, and ensure that water flows smoothly into the second heat exchange tube 2, thereby avoiding the reduction of water in the second heat exchange tube 2 and the vaporization during heating, and preventing the second heat exchange tube 2 from dry burning and discoloration. This not only ensures the stability of the heat exchanger and extends the service life of the gas water heater, but also effectively avoids the strong whistling noise caused by dry burning and discoloration, further improving the user experience.

[0068] It should be noted that when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0069] It should be understood that the terms "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations 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 modules or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In addition, in the description of the present invention, “a plurality of” and “a plurality of” mean two or more, unless otherwise clearly and specifically defined.

[0071] The technical means disclosed in the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A heat exchanger bypass structure, characterized in that: include: The heat exchange assembly includes a first heat exchange tube and a second heat exchange tube. One end of the first heat exchange tube is provided with a cold water inlet for inputting cold water, and the cold water inlet is connected to an external water inlet pipe through a cold water inlet pipe; one end of the second heat exchange tube is provided with a hot water outlet for outputting hot water; a connecting pipe, one end of which is connected to the other end of the first heat exchange pipe, and the other end of the connecting pipe is connected to the other end of the second heat exchange pipe; Wherein, it also includes a bypass pipe, one end of which is connected to the cold water inlet pipe and the other end of which is connected to the connecting pipe.

2. The heat exchanger bypass structure according to claim 1, characterized in that: The bypass pipe includes a first conduit arranged vertically, a second conduit arranged horizontally, and a third conduit in an arc shape; One end of the first conduit is connected to the connecting pipe, and the other end of the first conduit is connected to one end of the third conduit; one end of the second conduit is connected to the cold water inlet pipe, and the other end of the second conduit is connected to the other end of the third conduit.

3. The heat exchanger bypass structure according to claim 2, characterized in that: The cold water inlet pipe includes a first water inlet conduit and a second water inlet conduit. The first water inlet conduit is arranged horizontally and is connected to the cold water inlet end. The second water inlet conduit is arranged vertically and is connected to the first water inlet conduit. One end of the second conduit is connected to the second water inlet conduit.

4. The heat exchanger bypass structure according to claim 3, characterized in that: The specific heat capacity of water is c; the water flow rate of the second water inlet conduit is set to m and the temperature is t0; the water flow rate of the first water inlet conduit is m1 and the temperature is t0; the water flow rate of the bypass pipe is m2 and the temperature is t0; the water flow rate after heating in the first heat exchange tube is m1 and the temperature is t1; the water flow rate of the connecting tube flowing into the second heat exchange tube is m and the temperature is t2, which satisfies the following relationship: cm(t2-t0)=cm1(t1-t0).

5. The heat exchanger bypass structure according to any one of claims 1 to 4, characterized in that: The other end of the first heat exchange tube is provided with a water outlet, and the water outlet is provided with a first socket; The other end of the second heat exchange tube is provided with a water inlet end, the water inlet end is provided with a second socket, one end of the connecting tube is provided with a first inserting tube, and the other end thereof is provided with a second inserting tube; The first inserting pipe is inserted into the first socket, and the second inserting pipe is inserted into the second socket, so as to realize the connection and conduction between the connecting pipe and the water outlet and the water inlet.

6. The heat exchanger bypass structure according to claim 5, characterized in that: A first limiting protrusion is further provided at one end of the connecting pipe, and a second limiting protrusion is further provided at the other end of the connecting pipe; When the first inserting tube is inserted into the first socket and the second inserting tube is inserted into the second socket, the first limiting protrusion abuts against the first socket and the second limiting protrusion abuts against the second socket.

7. The heat exchanger bypass structure according to claim 3, characterized in that: The cold water inlet pipe also includes a first bent pipe, one end of which is connected to the second water inlet conduit, and the other end of which is provided with a water inlet joint for connecting to an external water inlet pipeline.

8. The heat exchanger bypass structure according to claim 7, characterized in that: The hot water outlet is connected to the external water outlet pipe through a hot water outlet pipe; the hot water outlet pipe includes a first water outlet conduit, a second water outlet conduit, and a second bent pipe, the first water outlet conduit being arranged horizontally and connected to the hot water outlet, and the second water outlet conduit being arranged vertically and connected to the first water outlet conduit; One end of the second bent pipe is connected to the second water outlet conduit, and the other end of the second bent pipe is provided with a water outlet joint for connecting to an external water outlet pipeline.

9. The heat exchanger bypass structure according to claim 8, characterized in that: The cold water inlet end is provided with a third socket, and the first water inlet conduit is plugged into the third socket to achieve connection and conduction with the cold water inlet end; The hot water outlet is provided with a fourth socket, and the first water outlet conduit is plugged into the fourth socket to achieve connection and conduction with the hot water outlet.

10. A gas water heater, characterized in that: The heat exchanger comprises the heat exchanger bypass structure according to any one of claims 1 to 9.

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