Gas water heater

Abstract

The utility model discloses a gas water heater which comprises the following components: a box body which comprises an inner frame which is used for forming a combustion chamber in a surrounding manner and an outer frame which is arranged at the periphery of the inner frame, an air cooling channel is formed between the inner frame and the outer frame, the outer frame is provided with an air inlet hole which is communicated with the air cooling channel, and the inner frame is provided with an air outlet hole which is used for communicating the air cooling channel with the combustion chamber; the heat exchanger is arranged at the top of the box and connected with a water inlet pipe and a water outlet pipe; the bypass valve comprises a valve body and a control part arranged on the valve body, the valve body is provided with a bypass flow channel communicating the water inlet pipe with the water outlet pipe, and the control part is used for controlling the water passing flow of the bypass flow channel; the bypass valve is located on the outer side of the box body and is adjacent to the air inlet hole, so that the bypass valve can be cooled when airflow flows towards the air inlet hole. According to the technical scheme, the temperature rise of a control part of the bypass valve can be reduced, and the service life of the bypass valve is prolonged.

Description

Technical Field

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

[0002] In the related art, some gas water heaters are connected to a bypass valve in the water system to achieve the bypass water mixing function. When the control component of the bypass valve is powered on, it usually generates heat and forms a temperature rise. At the same time, when the gas water heater is working, part of the heat generated by combustion will be radiated, so that the bypass valve is affected by the heat radiation and the temperature rise of the control component is further increased. This will affect the performance of the control component and shorten the service life of the bypass valve. Utility Model Content

[0003] The main purpose of the utility model is to provide a gas water heater, aiming to reduce the temperature rise of a control component of a bypass valve and increase the service life of the bypass valve.

[0004] In order to achieve the above-mentioned purpose, the gas water heater proposed by the utility model comprises:

[0005] The box body comprises an inner frame for surrounding a combustion chamber, and an outer frame arranged outside the inner frame, an air cooling channel is formed between the inner frame and the outer frame, the outer frame is provided with an air inlet hole communicating with the air cooling channel, and the inner frame is provided with an air outlet hole communicating the air cooling channel with the combustion chamber;

[0006] A heat exchanger is disposed on the top of the box body, and the heat exchanger is connected with a water inlet pipe and a water outlet pipe; and

[0007] A bypass valve comprises a valve body and a control component arranged on the valve body, wherein the valve body has a bypass flow channel connecting the water inlet pipe with the water outlet pipe, and the control component is used to control the water flow rate of the bypass flow channel; the bypass valve is located on the outside of the box body and is arranged adjacent to the air inlet hole so that the bypass valve can be cooled when the airflow flows toward the air inlet hole.

[0008] In one embodiment, the outer frame has a first side frame wall, the first side frame wall is provided with a plurality of the air inlet holes, the bypass valve is arranged opposite to the first side frame wall, and the orthographic projection of the bypass valve toward the first side frame wall at least partially falls into the area formed by the plurality of the air inlet holes.

[0009] In one of the embodiments, the orthographic projection of the valve body toward the first side frame wall falls within the area formed by the plurality of air inlet holes, and the orthographic projection of the control component toward the first side frame wall coincides with some of the air inlet holes.

[0010] In one embodiment, the plurality of air inlet holes on the first side frame wall are arranged into at least two rows along the height direction of the box body, and the orthographic projection of the valve body toward the first side frame wall falls into the area between two adjacent rows of the air inlet holes.

[0011] In one embodiment, the maximum distance between the bypass valve and the first side frame wall does not exceed 200 mm.

[0012] In one embodiment, the outer frame further has a second side frame wall adjacent to the first side frame wall, and the second side frame wall is provided with a plurality of the air inlet holes. In the height direction of the box body, at least part of the air inlet holes on the second side frame wall and the bypass valve are in the same preset height range.

[0013] In one embodiment, the gas water heater also includes a smoke hood arranged on the top of the heat exchanger, and a fan arranged on one side of the smoke hood, the air inlet of the fan is connected to the smoke hood, and the bypass valve is located at a lower position on a side of the fan away from the smoke hood.

[0014] In one of the embodiments, the air inlet hole is arranged in a strip-shaped hole.

[0015] In one embodiment, the valve body includes a first tube body connected to the water inlet pipe, a second tube body connected to the water outlet pipe, and a bypass tube body connecting the first tube body with the second tube body, the bypass flow channel is formed inside the bypass tube body, and the control component is arranged in the bypass tube body.

[0016] In one embodiment, the control component is located between the first tube body and the second tube body and is disposed close to the first tube body.

[0017] The technical solution of the utility model is to set the box of the gas water heater into a two-layer frame structure, and form an air cooling channel between the inner frame and the outer frame. The outside air can enter the air cooling channel through the air inlet of the outer frame to cool the side wall of the box. At the same time, the air in the cooling channel can be output to the combustion chamber through the air outlet of the inner frame to supplement the secondary air in the combustion chamber, so that the combustion is more complete. The bypass valve is located on the outside of the box and is arranged adjacent to the air inlet. On the one hand, the bypass valve is located on the outside of the box. Since the air cooling channel is formed inside the side wall of the box, the heat in the combustion chamber can be isolated from radiating outward, so that the box has less influence on the heat radiation of the bypass valve, and the temperature rise of the control component is avoided. On the other hand, since the bypass valve is arranged adjacent to the air inlet, there is a continuous flow of air near the air inlet, which can accelerate the heat dissipation of the bypass valve to cool the bypass valve, thereby reducing the temperature rise of the control component. In this way, through the comprehensive effect of multiple aspects, the temperature rise of the control component can be effectively reduced and the service life of the bypass valve can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural diagram of an embodiment of the utility model gas water heater;

[0020] Figure 2 for Figure 1 The cross-section of the tank of the gas water heater shows the structural intent;

[0021] Figure 3 The utility model is a schematic structural diagram of a bypass valve of a gas water heater according to an embodiment of the present invention.

[0022] Description of Figure Numbers:

[0023] Label name Label name 100 Gas water heater 50 Outlet pipe 10 case 60 Bypass valve 20 Cabinet 61 Valve body 201 Combustion Chamber 611 first tube body 202 Air cooling channel 612 Second tube body 21 Inner frame 613 Bypass pipe body 211 Air outlet 62 Control components 22 Frame 70 Fume hood 221 Air Inlet 80 Fan 22a First side frame wall 90 Burner 22b Second side frame wall 110 Water inlet connector 30 Heat Exchanger 120 Water outlet connector 40 Water inlet pipe 130 Air intake connector

[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0028] In the related art, some gas water heaters are connected to a bypass valve in the water system to achieve the bypass water mixing function. When the control component of the bypass valve is powered on, it usually generates heat and forms a temperature rise. At the same time, when the gas water heater is working, part of the heat generated by combustion will be radiated, so that the bypass valve is affected by the heat radiation and the temperature rise of the control component is further increased. This will affect the performance of the control component and shorten the service life of the bypass valve.

[0029] Based on this, the utility model proposes a gas water heater 100 , which can reduce the temperature rise of the control component 62 of the bypass valve 60 and increase the service life of the bypass valve 60 .

[0030] Please refer to Figures 1 to 3 In one embodiment of the utility model, the gas water heater 100 includes a housing 20, a heat exchanger 30 and a bypass valve 60. The housing 20 includes an inner frame 21 for surrounding a combustion chamber 201, and an outer frame 22 arranged outside the inner frame 21, an air cooling channel 202 is formed between the inner frame 21 and the outer frame 22, the outer frame 22 is provided with an air inlet 221 connected to the air cooling channel 202, and the inner frame 21 is provided with an air outlet 211 connecting the air cooling channel 202 with the combustion chamber 201; the heat exchanger 30 is arranged on the top of the housing 20, and the heat exchanger 30 is connected to a water inlet. pipe 40 and outlet pipe 50; the bypass valve 60 includes a valve body 61 and a control component 62 arranged on the valve body 61, the valve body 61 has a bypass flow channel connecting the water inlet pipe 40 with the water outlet pipe 50, and the control component 62 is used to control the water flow rate of the bypass flow channel; the bypass valve 60 is located on the outside of the box body 20 and is arranged adjacent to the air inlet hole 221, so that the bypass valve 60 can be cooled when the airflow flows toward the air inlet hole 221.

[0031] Specifically, the box body 20, the heat exchanger 30 and the bypass valve 60 are accommodated in the shell 10 of the gas water heater 100. Taking the strong extraction type gas water heater 100 as an example, the shell 10 is provided with a smoke hood 70, a heat exchanger 30, a box body 20 and a burner 90 from top to bottom, the smoke hood 70 is connected to a fan 80, and the burner 90 is connected to a gas proportional valve. The water inlet of the heat exchanger 30 is connected to a water inlet pipe 40, and the water outlet of the heat exchanger 30 is connected to a water outlet pipe 50. The bottom of the shell 10 is provided with a water inlet joint 110 connected to the water inlet pipe 40, a water outlet joint 120 connected to the water outlet pipe 50, and an air inlet joint 130 connected to the gas proportional valve. When the gas water heater 100 is working, the burner 90 is ignited, the fan 80 is started, the high-temperature flue gas in the combustion chamber 201 of the box 20 is transported upward and passes through the heat exchanger 30, and the cold water enters the heat exchanger 30 through the water inlet pipe 40. The high-temperature flue gas exchanges heat with the water in the heat exchanger 30 to achieve water heating. The heated hot water in the heat exchanger 30 is output through the water outlet pipe 50 to provide hot water for the user. The bypass valve 60 is connected between the water inlet pipe 40 and the water outlet pipe 50. The water flow rate of the bypass flow channel is controlled by the control component 62, so that the bypass water mixing function of the gas water heater 100 can be realized. Among them, the control component 62 can be a solenoid valve or a proportional valve. For example, in one embodiment, the control component 62 is a solenoid valve, and a normally closed solenoid valve can be used. The solenoid valve is used to control the on and off of the bypass flow channel, so that the bypass flow channel can be switched between two gears with bypass flow and without bypass flow, and the adjustment is simple and convenient, and the response speed is fast. For example, in another embodiment, the control component 62 may adopt a proportional valve, which is equipped with a stepping motor to achieve continuous stepless adjustment with higher adjustment accuracy. It can not only realize the on-off control of the bypass flow channel, but also realize the flow size adjustment of the bypass flow channel.

[0032] In this embodiment, the box body 20 is set as a two-layer frame structure, and an air cooling channel 202 is formed between the inner frame 21 and the outer frame 22. The outside air can enter the air cooling channel 202 through the air inlet 221 of the outer frame 22 to cool the side wall of the box body 20. At the same time, the air in the air cooling channel 202 can be output to the combustion chamber 201 through the air outlet 211 of the inner frame 21 to supplement the secondary air in the combustion chamber 201, so that the combustion is more complete. The bypass valve 60 is located on the outside of the box body 20 and is arranged adjacent to the air inlet 221. On the one hand, the bypass valve 60 is located on the outside of the box body 20. Since the air cooling channel 202 is formed inside the side wall of the box body 20, the heat in the combustion chamber 201 can be isolated from radiating outward, so that the box body 20 has little effect on the heat radiation of the bypass valve 60, and the temperature rise of the control component 62 is avoided. On the other hand, since the bypass valve 60 is disposed near the air inlet 221, air continuously flows near the air inlet 221, which can accelerate the heat dissipation of the bypass valve 60, so as to cool the bypass valve 60 and reduce the temperature rise of the control component 62. In this way, through the comprehensive effects of various aspects, the temperature rise of the control component 62 can be effectively reduced, and the service life of the bypass valve 60 can be extended.

[0033] In order to achieve a better cooling effect on the bypass valve 60, Figure 1 As shown, in one embodiment, the outer frame 22 has a first side frame wall 22a, the first side frame wall 22a is provided with a plurality of the air inlet holes 221, the bypass valve 60 is arranged opposite to the first side frame wall 22a, and the orthographic projection of the bypass valve 60 toward the first side frame wall 22a at least partially falls into the area surrounded by the plurality of the air inlet holes 221.

[0034] In this embodiment, a plurality of air inlet holes 221 are provided on the first side frame wall 22a, which can increase the air inlet area and the air inlet volume, thereby being more conducive to the rapid heat dissipation of the flow valve and its control component 62, and achieving a better cooling effect. In addition, the orthographic projection of the bypass valve 60 toward the first side frame wall 22a at least partially falls into the area formed by the plurality of air inlet holes 221, so that the plurality of air inlet holes 221 can be dispersedly arranged on the periphery of the bypass valve 60 as much as possible, thereby being able to achieve a cooling effect on various parts of the periphery of the bypass valve 60, making the overall heat dissipation of the bypass valve 60 more uniform, which is conducive to extending the service life of the bypass valve 60.

[0035] Furthermore, the orthographic projection of the valve body 61 toward the first side frame wall 22a falls into the area enclosed by the plurality of air inlet holes 221 , and the orthographic projection of the control component 62 toward the first side frame wall 22a overlaps with some of the air inlet holes 221 .

[0036] In this embodiment, the orthographic projection of the valve body 61 toward the first side frame wall 22a falls into the area formed by the plurality of air inlet holes 221, so that the plurality of air inlet holes 221 are arranged around the valve body 61 to cool down the various parts of the valve body 61, and the valve body 61 and the air inlet holes 221 are staggered at a certain position, so as to avoid the valve body 61 from blocking a large area of ​​the plurality of air inlet holes 221 on the first side frame wall 22a, thereby ensuring the smoothness of air flow. The orthographic projection of the control component 62 toward the first side frame wall 22a coincides with some of the air inlet holes 221, which is more conducive to the airflow toward the air inlet holes 221 flowing through the control component 62, so as to have a better cooling effect on the control component 62, thereby further reducing the temperature rise of the control component 62.

[0037] Furthermore, if Figure 1 As shown, the plurality of air inlet holes 221 on the first side frame wall 22a are arranged in at least two rows along the height direction of the box body 20, and the orthographic projection of the valve body 61 toward the first side frame wall 22a falls into the area between two adjacent rows of the air inlet holes 221. In this way, when the airflow enters the upper and lower rows of air inlet holes 221, the upper and lower sides of the valve body 61 can be cooled respectively, which is more conducive to heat dissipation.

[0038] In order to achieve a better heat dissipation effect, optionally, the maximum distance between the bypass valve 60 and the first side frame wall 22a does not exceed 200 mm. For example, the distance between the bypass valve 60 and the first side frame wall 22a can be 50 mm, 100 mm, 150 mm, 200 mm, etc.

[0039] like Figure 1 As shown, in one embodiment, the outer frame 22 further has a second side frame wall 22b adjacent to the first side frame wall 22a, and the second side frame wall 22b is provided with a plurality of air inlet holes 221. In the height direction of the box body 20, at least part of the air inlet holes 221 on the second side frame wall 22b and the bypass valve 60 are in the same preset height range.

[0040] In this embodiment, the first side frame wall 22a and the second side frame wall 22b of the outer frame 22 are respectively provided with a plurality of air inlet holes 221, which can realize multi-side air inlet, further improve the cooling effect on the box body 20, and also can play a cooling effect on the components in the peripheral area outside the box body 20. In the height direction of the box body 20, the air inlet holes 221 on the second side frame wall 22b and the bypass valve 60 are in the same preset height range, so that there is a large air flow in the preset height range, which is more conducive to the heat dissipation of the bypass valve 60, so as to play a better cooling effect on the bypass valve 60. For example, the height of the box body 20 is H, and the preset height range can be a height range of 0.3H to 0.7H. Optionally, the outer frame 22 further includes a third side frame wall opposite to the first side frame wall 22a, and a fourth side frame wall opposite to the second side frame wall 22b, and the first side frame wall 22a, the second side frame wall 22b, the third side frame wall and the fourth side frame wall are enclosed to form a frame-shaped structure that matches the shape of the inner frame 21. Cooling air ducts are respectively formed between each side frame wall of the inner frame 21 and the outer frame 22, and accordingly, each side frame wall of the outer frame 22 is provided with an air inlet 221, and each side frame wall of the inner frame 21 is provided with an air outlet 211.

[0041] like Figure 1 As shown, in one embodiment, the gas water heater 100 also includes a smoke hood 70 arranged on the top of the heat exchanger 30, and a fan 80 arranged on one side of the smoke hood 70, the air inlet of the fan 80 is connected to the smoke hood 70, and the bypass valve 60 is located at a lower position on the side of the fan 80 away from the smoke hood 70.

[0042] In this embodiment, the fan 80 may specifically include a volute, an impeller disposed in the volute, and a motor disposed on one side of the volute, and the motor is connected to the impeller to drive the impeller to rotate. The volute is provided with a side of the air inlet connected to the smoke hood 70, and the air outlet of the volute is connected to the exhaust pipe. The motor is disposed on the side of the volute away from the smoke hood 70, and the bypass valve 60 is disposed on one side of the housing 20 and is located below the motor. When the fan 80 is working, a negative pressure can be generated in the housing 20, so that the outside air can be driven from the air inlet 221 through the cooling air duct into the combustion chamber 201, so as to supplement the secondary air into the combustion chamber 201, so that the combustion is more complete. The high-temperature flue gas generated in the combustion chamber 201 can be transported upward under the action of the fan 80 and heat exchanged with the heat exchanger 30, and then the flue gas enters the smoke hood 70 and gathers, and finally is discharged from the air outlet of the fan 80 and the exhaust pipe. In addition, the bypass valve 60 and the fan 80 are both arranged on the same side close to the heat exchanger 30. The bypass valve 60 is located below the fan 80. When the fan 80 is working, it can disturb the airflow in the surrounding area to accelerate the flow, which is also beneficial to the heat dissipation of the bypass valve 60.

[0043] Optionally, the air inlet hole 221 is provided as a strip-shaped hole. In this way, the air inlet hole 221 has a larger air inlet area, which is conducive to the passage of airflow, and can also achieve a better heat dissipation effect on the bypass valve 60. For example, the air inlet hole 221 can be a strip-shaped hole extending in the horizontal direction, or the air inlet hole 221 can also be a strip-shaped hole extending in the vertical direction. Of course, in other embodiments, the air inlet hole 221 can also be provided as a circular hole, a square hole or a special-shaped hole, etc. When a plurality of air inlet holes 221 are provided, the shapes of the plurality of air inlet holes 221 can be the same or different.

[0044] Based on the above embodiments, Figure 1 and Figure 3 As shown, in one embodiment, the valve body 61 includes a first tube body 611 connected to the water inlet pipe 40, a second tube body 612 connected to the water outlet pipe 50, and a bypass tube body 613 connecting the first tube body 611 with the second tube body 612, the bypass flow channel is formed inside the bypass tube body 613, and the control component 62 is arranged in the bypass tube body 613.

[0045] In this embodiment, the valve body 61 is generally in an "H"-shaped structure, the first tube body 611 and the second tube body 612 extend in parallel and are arranged at intervals, and the two ends of the bypass tube body 613 are respectively connected to the middle positions of the first tube body 611 and the second tube body 612. The bypass valve 60 adopts an H-valve structure, which is simple in structure, easy to manufacture, and has a small overall volume, and is suitable for installation inside a water heater. Among them, the valve body 61 can be an integrally formed structure, or an assembled structure formed by splicing multiple parts. For example, the first tube body 611 and the bypass tube body 613 can be integrally formed to form a "T"-shaped structure, and the peripheral wall of the second tube body 612 is convexly provided with a joint that is plugged and matched with the end of the bypass tube body 613. Of course, in some embodiments, the valve body 61 is not limited to the H-valve structure, as long as a corresponding flow channel is constructed inside the valve body 61, for example, the valve body 61 can also be set as a waterway plate.

[0046] Further, the control component 62 is located between the first tube body 611 and the second tube body 612 and is arranged close to the first tube body 611. In this embodiment, the control component 62 is arranged on the peripheral wall of the bypass tube body 613 and is located between the first tube body 611 and the second tube body 612. In this way, the cavity area constructed by the valve body 61 itself can be fully utilized to accommodate the control component 62, thereby improving space utilization, reducing the overall volume of the bypass valve 60, and facilitating the miniaturization of the bypass valve body 61. In addition, the control component 62 is arranged closer to the first tube body 611 and farther from the second tube body 612. In the gas water heater 100, the first tube body 611 is used to transport cold water, and the second tube body 612 is used to transport hot water. The control component 62 can be arranged away from the hot water pipe (that is, the second tube body 612) to avoid damage to the control component 62 by the heat radiated by the hot water pipe. At the same time, the control component 62 is arranged closer to the cold water pipe (that is, the first tube body 611), which is beneficial to the heat dissipation of the control component 62, thereby further extending the service life of the bypass valve 60.

[0047] In one embodiment, the water inlet pipe 40, the heat exchanger 30, the water outlet pipe 50 and the bypass valve 60 are connected to form a circulation loop, and the circulation loop is provided with a circulation water pump (not shown), and the circulation water pump is used to drive water to flow along the circulation loop. Among them, the circulation water pump can be arranged in the water inlet pipe 40 or the water outlet pipe 50. Considering that the temperature of the water outlet pipe 50 is usually high, it is easy to cause the surface temperature rise of the circulation water pump to be too high and affect the service life. Optionally, the circulation water pump is arranged in the water inlet pipe 40, which can extend the service life of the circulation water pump.

[0048] When the gas water heater 100 is in a low temperature and severe cold environment, the gas water heater 100 is started in the self-circulation mode, the bypass valve 60 is opened, the circulating water pump is started, and the circulating water pump drives the water flow to circulate in the circulation loop inside the gas water heater 100. At the same time, the burner 90 of the gas water heater 100 is ignited and burned to heat the water flow in the circulation loop. In this way, the water flow in the circulation loop will be quickly heated, thereby playing the role of antifreeze of the water path components of the gas water heater 100. Compared with the solution of realizing antifreeze through an external circulation pipeline in the prior art, in this solution, the circulation loop is built into the gas water heater 100, and the total length of the circulation loop is greatly reduced, so that the water content in the self-circulation path is much less than the water content in the external circulation pipeline. Therefore, the burner 90 is started once to achieve the purpose of antifreeze. The running time required is shorter, the gas consumption is lower, the antifreeze is more efficient, and the time that the antifreeze operation of the gas water heater 100 causes interference to the user is greatly shortened. In addition, this antifreeze solution is also suitable for users who have not installed a return valve, reducing the installation and use costs.

[0049] When the gas water heater 100 is in the water-off-and-on scenario, the self-circulation mode of the gas water heater 100 is started, and the water in the heat exchanger 30 flows out of the heat exchanger 30 under the action of self-circulation, and no longer continuously absorbs the residual heat in the cavity, which can effectively reduce the "hot feeling" when it is turned on again; at the same time, after starting the self-circulation, the burner 90 is started to heat the water in the circulation loop. During the self-inspection and pre-cleaning sequence of the gas water heater 100 for the second water-on, the first water to flow out is the water heated by the self-circulation of the water inlet flow path and combustion, rather than the unheated cold water, so the "cold feeling" of the second water-on can be effectively reduced. In this way, the problem of water temperature fluctuation in the water-off-and-on scenario can be well solved, avoiding the "hot feeling" and "cold feeling" of users during bathing, and improving the user experience.

[0050] In addition, when the gas water heater 100 is working normally in a non-bathing scenario, the bypass flow channel can also be closed through the control component 62. At this time, the highest temperature in the heat exchange tube of the heat exchanger 30 is the set temperature of the gas water heater 100. In this way, the risk of gasification noise can be greatly reduced, and the thermal efficiency of the heat exchanger 30 will not be affected. The service life of the heat exchanger 30 can also be extended.

[0051] In one embodiment, a heating element (not shown) is provided on the circulation loop, and the heating element is used to heat the water flow in the circulation loop. In the self-circulation mode, the heating element can be started to heat the water flow at the same time, which can improve the heating efficiency. Among them, the heating element includes but is not limited to heating by means of electric heating or heat storage heating. Optionally, the heating element is an electric heater provided on the water inlet pipe 40. During non-water use periods in severe winter conditions (for example, in the early morning), the heating element can be started to heat the water in the circulation loop instead of the burner 90. On the basis of solving the problem of antifreeze of the water path components of the gas water heater 100, the noise generated by the combustion of the burner 90 can also be avoided to avoid affecting the user's rest.

[0052] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A gas water heater, characterized in that: include: The box body comprises an inner frame for surrounding a combustion chamber, and an outer frame arranged outside the inner frame, an air cooling channel is formed between the inner frame and the outer frame, the outer frame is provided with an air inlet hole communicating with the air cooling channel, and the inner frame is provided with an air outlet hole communicating the air cooling channel with the combustion chamber; A heat exchanger is disposed on the top of the box body, and the heat exchanger is connected with a water inlet pipe and a water outlet pipe; and A bypass valve comprises a valve body and a control component arranged on the valve body, wherein the valve body has a bypass flow channel connecting the water inlet pipe with the water outlet pipe, and the control component is used to control the water flow rate of the bypass flow channel; the bypass valve is located on the outside of the box body and is arranged adjacent to the air inlet hole so that the bypass valve can be cooled when the airflow flows toward the air inlet hole.

2. The gas water heater according to claim 1, characterized in that: The outer frame has a first side frame wall, the first side frame wall is provided with a plurality of the air inlet holes, the bypass valve is arranged opposite to the first side frame wall, and the orthographic projection of the bypass valve toward the first side frame wall at least partially falls into the area formed by the plurality of the air inlet holes.

3. The gas water heater according to claim 2, characterized in that: The orthographic projection of the valve body toward the first side frame wall falls into the area formed by the plurality of air inlet holes, and the orthographic projection of the control component toward the first side frame wall coincides with some of the air inlet holes.

4. The gas water heater according to claim 2, characterized in that: The plurality of air inlet holes on the first side frame wall are arranged into at least two rows along the height direction of the box body, and the orthographic projection of the valve body toward the first side frame wall falls into the area between two adjacent rows of the air inlet holes.

5. The gas water heater according to claim 2, characterized in that: The maximum distance between the bypass valve and the first side frame wall does not exceed 200 mm.

6. The gas water heater according to claim 2, characterized in that: The outer frame also has a second side frame wall adjacent to the first side frame wall, and the second side frame wall is provided with a plurality of the air inlet holes. In the height direction of the box body, at least part of the air inlet holes on the second side frame wall and the bypass valve are in the same preset height range.

7. The gas water heater according to claim 1, characterized in that: It also includes a smoke collecting hood arranged on the top of the heat exchanger, and a fan arranged on one side of the smoke collecting hood, the air inlet of the fan is connected to the smoke collecting hood, and the bypass valve is located at a lower position on the side of the fan away from the smoke collecting hood.

8. The gas water heater according to claim 1, characterized in that: The air inlet holes are arranged in strip-shaped holes.

9. The gas water heater according to any one of claims 1 to 8, characterized in that: The valve body includes a first tube body connected to the water inlet pipe, a second tube body connected to the water outlet pipe, and a bypass tube body connecting the first tube body with the second tube body, the bypass flow channel is formed inside the bypass tube body, and the control component is arranged on the bypass tube body.

10. The gas water heater according to claim 9, characterized in that: The control component is located between the first tube body and the second tube body and is arranged close to the first tube body.

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