Gas water heater

Abstract

The utility model discloses a gas water heater. The gas water heater comprises a shell, a water inlet pipe and a water outlet pipe, the combustion heat exchange system is arranged in the shell, the combustion heat exchange system is provided with a flue allowing airflow to pass through and a heat exchange flow channel allowing the airflow to pass through, the water inlet end of the heat exchange flow channel is connected with a water inlet pipe, and the water outlet end of the heat exchange flow channel is connected with a water outlet pipe; the fan is arranged in the shell, and the fan is communicated with the flue and used for driving airflow to flow along the flue; the bypass valve is arranged in the shell and is close to the fan, 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 for 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. 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] case;

[0006] A combustion heat exchange system is arranged in the shell, the combustion heat exchange system has a flue for air flow and a heat exchange channel for water flow, the water inlet end of the heat exchange channel is connected to a water inlet pipe, and the water outlet end of the heat exchange channel is connected to a water outlet pipe;

[0007] a fan, disposed in the housing, the fan being in communication with the flue and configured to drive airflow along the flue; and

[0008] A bypass valve is arranged in the shell and close to the fan. The bypass valve includes a valve body and a control component arranged on the valve body. The valve body has a bypass flow channel connecting the water inlet pipe with the water outlet pipe. The control component is used to control the water flow rate of the bypass flow channel.

[0009] In one embodiment, the combustion and heat exchange system includes a burner and a heat exchanger disposed above the burner, the burner and the heat exchanger are connected to form the flue, the heat exchange flow channel is formed inside the heat exchanger, the fan is disposed at the bottom of the burner, and the air outlet of the fan is connected to the burner.

[0010] In one embodiment, the bypass valve is located on the air inlet side of the fan; or,

[0011] The housing has a first plate surface and a second plate surface that are opposite to each other. The air inlet of the fan is arranged toward the second plate surface. The bypass valve is located between the first plate surface and the fan.

[0012] In one of the embodiments, a gas proportional valve is provided at the bottom of the burner, the gas proportional valve is arranged side by side with the fan and at an interval, and the bypass valve is located between the fan and the gas proportional valve.

[0013] In one of the embodiments, the control component is disposed on a side of the valve body away from the burner.

[0014] In one of the embodiments, the maximum distance between the bypass valve and the fan does not exceed 350 mm.

[0015] In one of the embodiments, the gas water heater further includes a bracket for connecting and fixing the bypass valve to the shell.

[0016] 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.

[0017] In one embodiment, the water inlet and the water outlet of the heat exchange channel are respectively located on both sides of the combustion heat exchange system, and the water inlet pipe and the water outlet pipe extend from both sides of the combustion heat exchange system to connect with the valve body;

[0018] Alternatively, the water inlet and outlet of the heat exchange channel are located on the same side of the combustion heat exchange system, and the water inlet pipe and the water outlet pipe extend from the same side of the combustion heat exchange system to be connected to the valve body.

[0019] In one embodiment, the bypass valve is arranged near the bottom wall of the shell, and the bypass valve includes a first joint portion provided at the water inlet end of the first tube body, and a second joint portion provided at the water outlet end of the second tube body, the first joint portion passes through the bottom wall to serve as the water inlet joint of the gas water heater, and the second joint portion passes through the bottom wall to serve as the water outlet joint of the gas water heater.

[0020] The technical solution of the utility model can make the gas water heater realize the bypass water mixing function by connecting a bypass valve between the water inlet pipe and the water outlet pipe. The bypass valve is arranged in the housing and close to the fan. When the fan is working, the outside air will flow to the fan continuously, and the airflow in the flow field near the fan has a faster circulation speed. The airflow can be used to take away the heat generated by the control components of the bypass valve, and the control components can be quickly dissipated, which is conducive to reducing the temperature rise of the control components and prolonging the service life of the bypass valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model gas water heater;

[0023] Figure 2 This is a schematic structural diagram of a second embodiment of the gas water heater of the utility model;

[0024] Figure 3 This is a schematic structural diagram of a third embodiment of the gas water heater of the utility model;

[0025] Figure 4 It is a structural schematic diagram of an embodiment of a bypass valve of a gas water heater of the utility model;

[0026] Figure 5 The utility model is a schematic structural diagram of another embodiment of the bypass valve of the gas water heater.

[0027] Description of Figure Numbers:

[0028]

[0029]

[0030] 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

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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 .

[0036] Please refer to Figures 1 to 3 In an embodiment of the utility model, the gas water heater 100 includes a shell 10, a combustion heat exchange system 20, a fan 50 and a bypass valve 60. The combustion heat exchange system 20 is arranged in the shell 10, and the combustion heat exchange system 20 has a flue 201 for air flow and a heat exchange flow channel 202 for water flow, the water inlet end of the heat exchange flow channel 202 is connected to the water inlet pipe 30, and the water outlet end of the heat exchange flow channel 202 is connected to the water outlet pipe 40; the fan 50 is arranged in the shell 10, and the fan 50 is connected to the flue 201, and is used to drive the airflow to flow along the flue 201; the bypass valve 60 is arranged in the shell 10 and is arranged close to the fan 50, and 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 30 with the water outlet pipe 40, and the control component 62 is used to control the water flow rate of the bypass flow channel.

[0037] When the gas water heater 100 is working, the high-temperature flue gas generated by the combustion of the combustion heat exchange system 20 is transported upward through the flue 201, and cold water enters the heat exchange flow channel 202 of the combustion heat exchange system 20 through the water inlet pipe 30. The high-temperature flue gas exchanges heat with the water in the heat exchange flow channel 202 to achieve water heating, and the hot water in the heat exchange flow channel 202 is output through the water outlet pipe 40. The fan 50 is connected to the flue 201 to drive the air flow to flow along the flue 201. For the strong-drum gas water heater 100, the fan 50 is a strong blower provided at the air inlet end of the flue 201; for the strong-extraction gas water heater 100, the fan 50 is a strong exhaust fan provided at the air outlet end of the flue 201.

[0038] In order to enable the gas water heater 100 to have a bypass water mixing function, a bypass valve 60 is connected between the water inlet pipe 30 and the water outlet pipe 40. The valve body 61 of the bypass valve 60 is connected between the water inlet pipe 30 and the water outlet pipe 40, and a bypass flow channel is formed inside the valve body 61 to connect the water inlet pipe 30 with the water outlet pipe 40. The control component 62 is used to control the water flow through the bypass flow channel of the valve body 61. Specifically, the control component 62 (such as a solenoid valve) can be used to control the on-off of the bypass flow channel of the valve body 61 to achieve switching between flow and no flow; or the control component 62 (such as a proportional valve) can be used to adjust the flow cross-section size of the bypass flow channel of the valve body 61 to achieve flow adjustment (for example, switching between flow gears such as large flow, medium flow, small flow, and no flow). The control component 62 of the bypass valve 60 is electrically connected to the control system of the gas water heater 100. The control system sends corresponding control instructions to the control component 62 according to the working state of the water heater, and then the water flow rate of the bypass flow channel can be controlled through the control component 62, so that the bypass mixed water volume of the water heater can be adjusted according to the actual working conditions to meet different application scenarios, thereby effectively improving the problems of the traditional gas water heater 100 such as the start-stop constant temperature difference, high vaporization noise, and low thermal efficiency.

[0039] In order to reduce the temperature rise of the control component 62 of the bypass valve 60 and extend the service life of the bypass valve 60, the bypass valve 60 is arranged in the housing 10 and close to the fan 50. Taking the strong drum type gas water heater 100 as an example, the fan 50 is generally located at the bottom of the burner 21 and is arranged close to the bottom wall 11 of the housing 10. Correspondingly, the bypass valve 60 is also arranged close to the bottom wall 11 of the housing 10. The bypass valve 60 is arranged adjacent to one side of the fan 50. Specifically, the bypass valve 60 can be arranged adjacent to any side of the left side, right side, upper side, lower side, front side or rear side of the fan 50. It is understandable that when the fan 50 is working, the outside air will continuously flow to the fan 50, and the airflow in the flow field near the fan 50 has a faster circulation speed. The bypass valve 60 is arranged close to the fan 50, and the airflow can be used to take away the heat generated by the control component 62 of the bypass valve 60, so as to achieve rapid heat dissipation of the control component 62, thereby helping to reduce the temperature rise of the control component 62 and improve the service life of the bypass valve 60. In order to achieve a better heat dissipation effect, optionally, the maximum distance between the bypass valve 60 and the fan 50 does not exceed 350mm.

[0040] The technical solution of the utility model can enable the gas water heater 100 to realize the bypass water mixing function by connecting the bypass valve 60 between the water inlet pipe 30 and the water outlet pipe 40. The bypass valve 60 is arranged in the housing 10 and is arranged close to the fan 50. When the fan 50 is working, the outside air will flow to the fan 50 continuously, and the air flow in the flow field near the fan 50 has a faster circulation speed, and the heat generated by the control component 62 of the bypass valve 60 can be taken away by the air flow, so as to realize the rapid heat dissipation of the control component 62, thereby facilitating the reduction of the temperature rise of the control component 62 and prolonging the service life of the bypass valve 60.

[0041] like Figures 1 to 3 As shown, taking the strong-drum gas water heater 100 as an example, in some embodiments, the combustion heat exchange system 20 includes a burner 21 and a heat exchanger 22 arranged above the burner 21, the burner 21 is connected to the heat exchanger 22 to form the flue 201, the heat exchange flow channel 202 is formed inside the heat exchanger 22, the fan 50 is arranged at the bottom of the burner 21, and the air outlet of the fan 50 is connected to the burner 21.

[0042] In this embodiment, the combustion heat exchange system 20 includes a burner 21 and a heat exchanger 22 disposed above the burner 21. The heat exchanger 22 may specifically include a shell and a heat exchange tube disposed in the shell. The outer shell of the burner 21 is connected to the shell of the heat exchanger 22 to form a flue 201. The high-temperature flue gas generated by the combustion of the burner 21 can flow upward along the flue 201 and contact the heat exchange tube of the heat exchanger 22 for heat exchange. The heat exchange tube can be arranged in parallel in multiple pieces, or can be formed by bending a tube, and the tube cavity of the heat exchange tube forms a heat exchange flow channel 202. In order to improve the heat exchange efficiency, the heat exchanger 22 may also include a plurality of heat exchange fins disposed on the periphery of the heat exchange tube. In addition, the top of the heat exchanger 22 may also be covered with a smoke collecting hood 70, and the smoke collecting hood 70 has a smoke exhaust pipe passing through the shell 10. The fan 50 is arranged at the bottom of the burner 21, and the air outlet of the fan 50 is connected to the burner 21. When the gas water heater 100 is working, the fan 50 can be used to blow air into the burner 21 to achieve secondary air replenishment to ensure sufficient combustion. The fan 50 can also drive the high-temperature flue gas generated by the burner 21 to flow upward, exchange heat with the heat exchanger 22, and then be sucked into the smoke hood 70, and finally discharged through the smoke exhaust pipe.

[0043] There may be many specific locations for the bypass valve 60 , and several embodiments thereof are described below.

[0044] In one embodiment, the bypass valve 60 is located at the air inlet side of the fan 50. It is understandable that when the fan 50 is working, the external airflow will continuously flow to the air inlet side of the fan 50. The bypass valve 60 is arranged at the air inlet side of the fan 50, so that the control component 62 of the bypass valve 60 can achieve a better heat dissipation effect. It is worth noting that the air inlet side of the fan 50 refers to the side of the fan 50 where the air inlet is provided, wherein the bypass valve 60 can be arranged directly opposite to the air inlet of the fan 50, or can also be arranged staggered with the air inlet of the fan 50.

[0045] In another embodiment, the housing 10 has a first plate surface and a second plate surface facing each other, the air inlet of the fan 50 is arranged toward the second plate surface, and the bypass valve 60 is located between the first plate surface and the fan 50. For example, the first plate surface may be the front plate surface of the housing 10, and the second plate surface may be the rear plate surface of the housing 10. In order to reduce the thickness of the housing 10, the distance between the first plate surface and the second plate surface is usually designed to be relatively small. In order to facilitate the installation of the bypass valve 60 and avoid excessive obstruction of the bypass valve 60 to the air inlet, the bypass valve 60 may be arranged between the fan 50 and the first plate surface, so that the space between the fan 50 and the first plate surface is fully utilized, making the overall structure more compact.

[0046] In yet another embodiment, Figure 3As shown, a gas proportional valve 80 is provided at the bottom of the burner 21, and the gas proportional valve 80 is arranged side by side and spaced apart from the fan 50, and the bypass valve 60 is located between the fan 50 and the gas proportional valve 80. In this way, the space between the fan 50 and the gas proportional valve 80 is fully utilized, making the overall structure more compact.

[0047] The burner 21 generates high temperature when working. In order to further reduce the influence of the high temperature radiation of the burner 21 on the control component 62, in one embodiment, the control component 62 is arranged on the side of the valve body 61 away from the burner 21. For example, when the bypass valve 60 and the fan 50 are arranged side by side at the bottom of the burner 21, the control component 62 can be arranged on the bottom side of the valve body 61.

[0048] In addition, when the gas water heater 100 is working, vibration is likely to occur near the fan 50. In order to prevent the bypass valve 60 from shaking, in one embodiment, the gas water heater 100 further includes a bracket for connecting and fixing the bypass valve 60 to the housing 10. In this way, a stable connection structure can be formed between the bypass valve 60 and the housing 10, thereby preventing the bypass valve 60 from shaking during the operation of the gas water heater 100, thereby ensuring the working reliability of the bypass valve 60. Optionally, the valve body 61 and the bracket are integrally formed, for example, the valve body 61 and the bracket are integrally injection molded, which can simplify the manufacturing process and ensure structural stability.

[0049] Based on the above embodiments, Figure 1 and Figure 4 As shown, in one embodiment, the valve body 61 includes a first tube body 611 connected to the water inlet pipe 30, a second tube body 612 connected to the water outlet pipe 40, 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.

[0050] 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. Among them, the first tube body 611 can be connected in series to the middle position of the water inlet pipe 30, or it can be arranged at the water inlet end of the water inlet pipe 30; the second tube body 612 can be connected in series to the middle position of the water outlet pipe 40, or it can be arranged at the water outlet end of the water outlet pipe 40. The bypass valve adopts an H valve structure, which has a simple structure, is easy to produce, and has a small overall volume, and is suitable for installation inside the water heater. Among them, the valve body 61 can be an integrally formed structure, or it can be an assembled structure formed by splicing multiple parts. For example, in this embodiment, 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.

[0051] 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 specifically a normally closed solenoid valve can be used. The solenoid valve is used to control the on-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 can be a proportional valve, and the proportional valve is equipped with a stepping motor to achieve continuous stepless adjustment, with higher adjustment accuracy, which 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.

[0052] Optionally, 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 volume of the bypass valve 60.

[0053] Optionally, the axis of the first tube body 611, the center line of the control component 62, and the axis of the second tube body 612 are parallel to each other, and the distance between the center line of the control component 62 and the axis of the first tube body 611 is smaller than the distance between the center line of the control component 62 and the axis of the second tube body 612. In this way, the control component 62 can be 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 conducive to the heat dissipation of the control component 62, thereby further extending the service life of the bypass valve 60.

[0054] like Figures 1 to 4 As shown, in some embodiments, the water inlet and outlet of the heat exchange channel 202 are respectively located on both sides of the combustion heat exchange system 20, and the water inlet pipe 30 and the water outlet pipe 40 extend from both sides of the combustion heat exchange system 20 to connect with the valve body 61. Specifically, in this embodiment, the shell 10 has a first side wall and a second side wall opposite to each other in the width direction (for example, the left and right direction), and the heat exchanger 22, the burner 21 and the fan 50 are arranged in sequence from top to bottom along the height direction of the shell 10, and the fan 50 is arranged close to the first side wall of the shell 10. Correspondingly, the bypass valve 60 is located at the bottom of the shell 10 and is arranged close to the first side wall of the shell 10. The water inlet end of the heat exchange channel 202 faces the second side wall of the shell 10, and the water inlet pipe 30 extends downward from the water inlet end of the heat exchange channel 202 for a distance, then bends horizontally and extends toward the first side wall of the shell 10 to connect with the first pipe body 611 of the valve body 61. The water outlet end of the heat exchange channel 202 faces the first side wall of the shell 10 , and the water outlet pipe 40 extends downward from the water outlet end of the heat exchange channel 202 to be connected to the second pipe body 612 of the valve body 61 .

[0055] Of course, in other embodiments, the water inlet and outlet of the heat exchange channel 202 may be located on the same side of the combustion heat exchange system 20, and the water inlet pipe 30 and the water outlet pipe 40 extend from the same side of the combustion heat exchange system 20 to connect with the valve body 61. For example, the bypass valve is located at the bottom of the shell 10 and is arranged close to the first side wall of the shell 10, and the water inlet and outlet of the heat exchange channel 202 are both arranged toward the first side wall of the shell 10, then the water inlet pipe 30 and the water outlet pipe 40 may extend downward from the water inlet and outlet of the heat exchange channel 202 to connect with the valve body 61, respectively.

[0056] like Figure 1As shown, the bottom wall 11 of the shell 10 of the gas water heater 100 is generally provided with a water inlet joint 110 communicating with the water inlet pipe 30, a water outlet joint 120 communicating with the water outlet pipe 40, and a gas inlet joint 130 communicating with the gas proportional valve 80. In some embodiments, the first tube body 611 is serially connected to the middle position of the water inlet pipe 30, and the second tube body 612 is serially connected to the middle position of the water outlet pipe 40, so that the two ends of the first tube body 611 form two connection parts with the water inlet pipe 30 respectively, and the two ends of the second tube body 612 form two connection parts with the water outlet pipe 40 respectively, and after assembly, the water inlet pipe 30 and the water outlet pipe 40 are also assembled and connected with the water inlet joint 110 and the water outlet joint 120 of the water heater respectively. The installation structure of this bypass valve 60 is complex, the assembly is difficult, the work is time-consuming, and the assembly manufacturing cost is high; after assembly, the sealing connection parts have high assembly dimensional accuracy requirements and high component process requirements, which correspondingly increases the component cost; the number of sealing connection parts is large, which increases the probability of water leakage due to poor sealing.

[0057] In order to simplify the installation structure of the bypass valve 60, reduce the installation difficulty and cost, and at the same time improve the sealing effectiveness and reduce the probability of water leakage. Figure 2 , Figure 3 and Figure 5 As shown, in some embodiments, the bypass valve 60 is arranged near the bottom wall 11 of the shell 10, and the bypass valve 60 includes a first joint portion 63 provided at the water inlet end of the first tube body 611, and a second joint portion 64 provided at the water outlet end of the second tube body 612, the first joint portion 63 passes through the bottom wall 11 to serve as the water inlet joint 110 of the gas water heater 100, and the second joint portion 64 passes through the bottom wall 11 to serve as the water outlet joint 120 of the gas water heater 100.

[0058] During assembly, the valve body 61 of the bypass valve 60 is placed in the shell 10, the water outlet end of the first tube body 611 is assembled and connected with the water inlet end of the water inlet pipe 30, and the water inlet end of the second tube body 612 is assembled and connected with the water outlet end of the water outlet pipe 40. At the same time, the first joint part 63 and the second joint part 64 of the bypass valve 60 can pass through the bottom wall 11 of the shell 10 to serve as the water inlet joint 110 and the water outlet joint 120 of the gas water heater 100 respectively. In this way, there are only two connection points between the bypass valve 60 and the water inlet pipe 30 and the water outlet pipe 40, and the first joint part 63 and the second joint part 64 of the bypass valve 60 can be directly used as the water inlet joint 110 and the water outlet joint 120 of the water heater respectively. No other piping structure is required between the bypass valve 60 and the water inlet joint 110 and the water outlet joint 120 of the water heater, so that the installation structure of the bypass valve 60 is simpler, which can reduce the sealing connection points of the whole machine, reduce the difficulty of component processing and whole machine assembly, and reduce the component cost and the whole machine assembly cost; and the bypass valve 60 has only two connection points between the water inlet pipe 30 and the water outlet pipe 40, and the sealing connection points of the whole machine are reduced, which can effectively improve the sealing effectiveness and reduce the probability of water leakage.

[0059] In order to simplify the manufacturing process and improve the sealing reliability, optionally, the first joint part 63 is integrally formed at the water inlet end of the first tube body 611; the second joint part 64 is integrally formed at the water outlet end of the second tube body 612. Optionally, the first joint part 63 is in the shape of a hollow tube extending coaxially with the first tube body 611, and the outer peripheral surface of the end of the first joint part 63 away from the first tube body 611 is provided with a first external thread so as to be connected to an external water supply pipeline; the second joint part 64 is in the shape of a hollow tube extending coaxially with the second tube body 612, and the outer peripheral surface of the end of the second joint part 64 away from the second tube body 612 is provided with a second external thread so as to be connected to an external water outlet pipeline.

[0060] In order to further improve the assembly stability of the bypass valve 60 and the housing 10, as shown in FIG. Figure 5 As shown, in one embodiment, the bypass valve 60 also includes a first connecting portion 65 and a second connecting portion 66, the first connecting portion 65 is arranged on the outer peripheral wall of the connecting portion of the first tube body 611 and the first joint portion 63, the second connecting portion 66 is arranged on the outer peripheral wall of the connecting portion of the second tube body 612 and the second joint portion 64, and the first connecting portion 65 and the second connecting portion 66 are respectively provided with connecting holes for fasteners to pass through.

[0061] Specifically, the bottom wall 11 of the housing 10 may be provided with mounting holes for the first joint portion 63 and the second joint portion 64 to pass through respectively. During assembly, the valve body 61 is placed in the housing 10, and the first joint portion 63 and the second joint portion 64 are respectively passed through the mounting holes on the bottom wall 11 to the outside of the housing 10. The first connection portion 65 and the second connection portion 66 may be respectively limitedly abutted against the inner side surface of the bottom wall 11 of the housing 10, and then fasteners (such as screws, bolts, etc.) are passed through the connection holes and the mounting holes on the bottom wall 11 to lock and fix the first connection portion 65 and the second connection portion 66 to the housing 10 respectively. Since the bypass valve 60 is respectively connected and fixed to the housing 10 through the first connection portion 65 and the second connection portion 66, the assembly reliability of the bypass valve 60 and the housing 10 can be further improved.

[0062] In one embodiment, the water inlet pipe 30, the heat exchanger 22, the water outlet pipe 40 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 30 or the water outlet pipe 40. Considering that the temperature of the water outlet pipe 40 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 30, which can extend the service life of the circulation water pump.

[0063] 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 21 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 21 is started once to achieve the purpose of antifreeze. The required operation time 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.

[0064] 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 22 flows out of the heat exchanger 22 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 21 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.

[0065] 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 22 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 22 will not be affected. The service life of the heat exchanger 22 can also be extended.

[0066] 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 arranged on the water inlet pipe 30. 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 21. 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 21 can also be avoided to avoid affecting the user's rest.

[0067] 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: case; A combustion heat exchange system is arranged in the shell, the combustion heat exchange system has a flue for air flow and a heat exchange channel for water flow, the water inlet end of the heat exchange channel is connected to a water inlet pipe, and the water outlet end of the heat exchange channel is connected to a water outlet pipe; a fan, disposed in the housing, the fan being in communication with the flue and configured to drive airflow along the flue; and A bypass valve is arranged in the shell and close to the fan. The bypass valve includes a valve body and a control component arranged on the valve body. The valve body has a bypass flow channel connecting the water inlet pipe with the water outlet pipe. The control component is used to control the water flow rate of the bypass flow channel.

2. The gas water heater according to claim 1, characterized in that: The combustion and heat exchange system includes a burner and a heat exchanger arranged above the burner. The burner is connected to the heat exchanger to form the flue. The heat exchange flow channel is formed inside the heat exchanger. The fan is arranged at the bottom of the burner, and the air outlet of the fan is connected to the burner.

3. The gas water heater according to claim 2, characterized in that: The bypass valve is located on the air inlet side of the fan; or, The housing has a first plate surface and a second plate surface that are opposite to each other. The air inlet of the fan is arranged toward the second plate surface. The bypass valve is located between the first plate surface and the fan.

4. The gas water heater according to claim 2, characterized in that: A gas proportional valve is provided at the bottom of the burner. The gas proportional valve is arranged side by side with the fan and at an interval. The bypass valve is located between the fan and the gas proportional valve.

5. The gas water heater according to claim 2, characterized in that: The control component is arranged on a side of the valve body away from the burner.

6. The gas water heater according to claim 1, characterized in that: The maximum distance between the bypass valve and the fan does not exceed 350 mm.

7. The gas water heater according to claim 1, characterized in that: It also includes a bracket for connecting and fixing the bypass valve to the shell.

8. The gas water heater according to any one of claims 1 to 7, 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.

9. The gas water heater according to claim 8, characterized in that: The water inlet and outlet of the heat exchange flow channel are respectively located on both sides of the combustion heat exchange system, and the water inlet pipe and the water outlet pipe extend from both sides of the combustion heat exchange system to connect with the valve body; Alternatively, the water inlet and outlet of the heat exchange channel are located on the same side of the combustion heat exchange system, and the water inlet pipe and the water outlet pipe extend from the same side of the combustion heat exchange system to be connected to the valve body.

10. The gas water heater according to claim 8, characterized in that: The bypass valve is arranged close to the bottom wall of the shell, and includes a first joint portion arranged at the water inlet end of the first tube body, and a second joint portion arranged at the water outlet end of the second tube body. The first joint portion passes through the bottom wall to serve as the water inlet joint of the gas water heater, and the second joint portion passes through the bottom wall to serve as the water outlet joint of the gas water heater.

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