Gas water heater

Abstract

The utility model discloses a gas water heater which comprises a heat exchanger provided with a water inlet and a water outlet, and a heat exchange runner used for circulating water is arranged between the water inlet and the water outlet. The combustor is used for heating water flowing through the heat exchange runner; the water storage tank comprises a cavity used for containing water, the cavity is provided with an inlet and an outlet, and the outlet is communicated with the water inlet; the communicating pipeline is used for connecting the water outlet with the inlet; the pump is arranged on the communicating pipeline and used for driving water in the communicating pipeline to flow; and the heating assembly can be used for heating the water storage tank. The water storage tank can be heated and subjected to heat preservation through the heating assembly, the heat preservation effect of the water storage tank is effectively improved, the frequency of starting the combustor to heat the water storage tank is reduced, noise is prevented from being generated to interfere a user, even in a low-temperature environment, it can be guaranteed that the machine stably operates, and the use experience of the user is better guaranteed.

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] Existing water heaters mainly include: gas water heaters, solar water heaters, air energy heat pump water heaters and electric water heaters, etc. Among them, the gas water heater is a typical instant water heater, which mainly includes a fan, a combustion device, a heat exchanger and other components.

[0003] Instant water heaters usually start heating when users turn on the water terminal. It usually takes 25s-50s or even longer to heat the water. Before the water is heated to the temperature required by the user, the cold water released is usually wasted. Overall, instant water heaters are slow to heat water, users have to wait for a long time, and it is easy to waste water resources during the waiting process.

[0004] In some specific application scenarios, such as in the kitchen, users often use water in small quantities for a short period of time. For example, when washing vegetables or rice, they often need to turn the faucet on and off many times. When the ambient temperature is low, users have a more urgent need for hot water.

[0005] In order to meet the user's demand for instant hot water, the prior art also provides some solutions. For example, a small kitchen treasure can be installed in a specific location such as the kitchen. The small kitchen treasure is specifically a volumetric electric water heater, which uses the hot water stored in its inner tank to meet the user's demand for instant hot water. Installing a small kitchen treasure will occupy the user's installation space; and the small kitchen treasure needs to be connected to a socket; in addition, the small kitchen treasure also has the disadvantages of the electric water heater itself. If the user's water consumption is very large, the small kitchen treasure may not be able to meet the user's water demand.

[0006] In addition, some other existing technologies also hope to meet the user's demand for instant hot water by improving the gas water heater, but there are still some problems to a greater or lesser extent.

[0007] In order to meet the needs of users for hot water as soon as it comes out, one feasible way is to set up a water storage tank for storing hot water. However, the inventor of the present application found that when the water storage tank is in some low-temperature working conditions, such as a low-temperature static environment or a low-temperature backflow wind working condition, the water in the water storage tank has a short heat preservation time.

[0008] Therefore, it is necessary to propose a gas water heater to solve the above problems. Utility Model Content

[0009] In view of the defects existing in the prior art, a gas water heater is provided in the embodiment of the utility model, which effectively reduces the frequency of machine startup and avoids noise interference to users. Even in low temperature environments, the machine can be ensured to run stably, thereby better ensuring the user experience.

[0010] The specific technical solution of the implementation mode of the utility model is:

[0011] A gas water heater, comprising:

[0012] A heat exchanger, wherein the heat exchanger has a water inlet and a water outlet, and a heat exchange flow channel for circulating water is provided between the water inlet and the water outlet;

[0013] A burner, the burner is used to heat the water flowing through the heat exchange flow channel;

[0014] A water storage tank, the water storage tank comprising a cavity for containing water, the cavity having an inlet and an outlet, the outlet being connected to the water inlet;

[0015] A connecting pipe, the connecting pipe is used to connect the water outlet with the inlet;

[0016] A pump, the pump being arranged on the communicating pipeline and being used for driving the water in the communicating pipeline to flow;

[0017] A heating component can be used to heat the water storage tank.

[0018] In a preferred embodiment, the gas water heater also includes a connecting pipe, which is used to connect the outlet of the cavity and the water inlet of the heat exchanger; the heating component is arranged on at least one of the following: on the water storage tank, on the connecting pipe close to the water storage tank, and on the connecting pipe.

[0019] In a preferred embodiment, the connecting pipeline includes a first pipeline connected to the inlet of the water storage tank, a second pipeline connected to the water outlet of the heat exchanger, and a bypass pipeline connected between the first pipeline and the second pipeline.

[0020] In a preferred embodiment, the gas water heater includes a water inlet pipeline connected to the inlet of the water storage tank and a water outlet pipeline connected to the water outlet of the heat exchanger, the first pipeline is part of the water inlet pipeline, and the second pipeline is part of the water outlet pipeline.

[0021] In a preferred embodiment, the heating component is arranged near the inlet and / or outlet of the cavity.

[0022] In a preferred embodiment, the water storage tank includes a water inlet joint connected to the inlet and a water outlet joint connected to the outlet, and the heating component is arranged on the outer surface of the water inlet joint and / or the water outlet joint.

[0023] In a preferred embodiment, the heating assembly is disposed on the outer surface of the water storage tank.

[0024] In a preferred embodiment, the heating component comprises at least one electric heating element, and the power of the heating component ranges from 20 watts to 50 watts.

[0025] In a preferred embodiment, a water inlet joint connecting the water inlet pipe with the cavity is provided at the entrance of the cavity, and a water outlet joint connecting the connecting pipe with the cavity is provided at the outlet of the cavity. The water inlet joint and / or the water outlet joint are provided with a mounting portion for mounting the heating component. When the heating component is started, the heating component can transfer heat to the water inlet joint and / or the water outlet joint through the mounting portion.

[0026] In a preferred embodiment, the mounting portion includes a mounting hole, and the heating assembly can be inserted into the mounting hole.

[0027] In a preferred embodiment, the heating assembly comprises at least a first electric heating element and a second electric heating element, wherein the first electric heating element is disposed close to the water inlet joint and the second electric heating element is disposed close to the water outlet joint.

[0028] In a preferred embodiment, the heating assembly includes a first electric heating element, a second electric heating element and a third electric heating element, and the first electric heating element, the second electric heating element and the third electric heating element are arranged at intervals beside the water inlet joint and the water outlet joint.

[0029] In a preferred embodiment, the gas water heater also includes a control valve, and the gas water heater includes a normal water use mode and an internal circulation mode. When the gas water heater is in the internal circulation mode, the control valve is in a first state to make the internal circulation water circuit connected. When the gas water heater is in the normal water use mode, the control valve is in a second state to make water flow from the water inlet pipe into the gas water heater and flow out of the gas water heater from the water outlet pipe.

[0030] In a preferred embodiment, a first connection portion is formed at the connection position between the water inlet pipe and the bypass pipe, a second connection portion is formed at the connection position between the water outlet pipe and the bypass pipe, and the control valve is arranged at any one of the following locations: in the bypass pipe, at the first connection portion, and at the second connection portion.

[0031] In a preferred embodiment, the gas water heater also includes a first temperature detection device arranged downstream of the second connection part. When the temperature detected by the first temperature detection device meets the first heating condition, the heating component is started, the pump is started for a certain period of time, and the water in the water storage tank, the heat exchanger and the connecting pipeline circulates to form an internal circulation water circuit.

[0032] In a preferred embodiment, the gas water heater also includes a second temperature detection device arranged on the cavity; when the temperature detected by the fifth temperature detection device meets the second temperature rise condition, the heating component is started, the pump is started for a certain period of time, and the water in the water storage tank, the heat exchanger and the connecting pipeline circulates to form an internal circulation water circuit.

[0033] In a preferred embodiment, the water storage tank further comprises: a heat exchange mechanism, wherein the interior of the heat exchange mechanism is used for flue gas to circulate, and the flue gas entering the heat exchange mechanism can exchange heat with the water contained in the cavity through the heat exchange mechanism.

[0034] In a preferred embodiment, the gas water heater further comprises a fan, an outlet of which is connected to the heat exchange mechanism, and at least part of the flue gas generated by the burner can be introduced into the heat exchange mechanism through the fan after flowing through the heat exchanger.

[0035] In a preferred embodiment, the heat exchange mechanism comprises a heat exchange smoke pipe, and the heat exchange smoke pipe of the heat exchange mechanism is arranged in the cavity.

[0036] In a preferred embodiment, the heat exchange mechanism has a smoke outlet and a smoke inlet, and a cover plate is provided at or near the smoke outlet, and the cover plate is used to open the smoke outlet when the fan is in a started state; when the fan is in a stopped state, the cover plate is used to close the smoke outlet.

[0037] In a preferred embodiment, the volume of the cavity is between 1 liter and 3 liters.

[0038] In a preferred embodiment, the water storage tank, the heat exchanger and the connecting pipeline are made of stainless steel.

[0039] The technical solution of the utility model has the following significant beneficial effects:

[0040] When the water tank of the gas water heater is in some special working conditions, such as low temperature environment, including low temperature static environment, low temperature backflow wind and other working conditions, the water in the water tank is kept warm for a short time, and the water temperature of the water tank may have dropped to a lower temperature within 30 minutes. In order to maintain the water temperature in the water tank, the method used can be to start the burner for combustion and supplementary heat. However, when the burner is frequently started for heating, noise will be generated to disturb the user, especially at night when the user is resting and the surrounding environment is relatively quiet. At this time, the gas water heater is frequently started for combustion, and the pump is started for internal circulation to increase the water temperature of the internal circulation waterway (especially the water tank). It is very likely to affect the user's experience. In addition, it will also affect the service life of the gas water heater itself.

[0041] The gas water heater provided in the embodiment of the present application is provided with a heating component on the water tank and / or on a pipeline close to the water tank (for example, on a connecting pipeline between the water outlet of the heat exchanger and the inlet of the water tank, or a connecting pipe between the outlet of the water tank and the water inlet of the heat exchanger) to effectively slow down the cooling rate of the water tank, thereby increasing the insulation time of the water tank, and further effectively reducing the frequency of starting the machine, avoiding noise that disturbs the user, and ensuring stable operation of the machine even in a low temperature environment, thereby better ensuring the user experience.

[0042] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0044] Figure 1 A schematic diagram of the structure of a gas water heater provided in an embodiment of the present application;

[0045] Figure 2Schematic diagram of the relative position relationship between the water storage tank and the heating component of a gas water heater provided in an embodiment of the present application Figure 1 ;

[0046] Figure 3 Schematic diagram of the relative position relationship between the water storage tank and the heating component of a gas water heater provided in an embodiment of the present application Figure 2 ;

[0047] Figure 4 Schematic diagram of the relative position relationship between the water storage tank and the heating component of a gas water heater provided in an embodiment of the present application Figure 3 .

[0048] Reference numerals of the present application:

[0049] 1. Burner;

[0050] 2. Heat exchanger; 21. Water inlet; 22. Water outlet;

[0051] 3. Water storage tank; 31. Inlet; 32. Outlet; 30. Heat exchange mechanism;

[0052] 41. first pipeline; 410. water inlet joint;

[0053] 42. Second pipeline; 420. Water outlet connector;

[0054] 45. Installation department;

[0055] 46. ​​Heating component;

[0056] 461, a first electric heating element;

[0057] 462, a second electric heating element;

[0058] 463, a third electric heating element;

[0059] 43. Bypass pipeline;

[0060] 44. Connecting pipe;

[0061] 5. Pump;

[0062] 61. A first temperature detection device;

[0063] 62. A second temperature detection device;

[0064] 7. Flow sensor;

[0065] 8. Control valve;

[0066] 9. Fan;

[0067] 91. A first connecting portion;

[0068] 92. second connecting portion;

[0069] 94. Smoke exhaust pipe;

[0070] 95. Cover plate. DETAILED DESCRIPTION

[0071] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art fall within the scope defined by the claims attached to this application.

[0072] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0073] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0074] The utility model provides a gas water heater, which can increase the insulation time of the water tank in a low-temperature environment, effectively reduce the frequency of machine startup, avoid noise interference to users, and ensure stable operation of the machine even in a low-temperature environment, thereby better ensuring the user experience.

[0075] Please refer to Figures 1 to 4In the embodiment of the present application specification, a gas water heater is provided, which may include: a heat exchanger 2, wherein the heat exchanger 2 has a water inlet 21 and a water outlet 22, and a heat exchange channel for circulating water is arranged between the water inlet 21 and the water outlet 22; a burner 1, wherein the burner 1 is used to heat water flowing through the heat exchange channel; a water storage tank 3, wherein the water storage tank 3 includes a cavity for accommodating water, wherein the cavity has an inlet 31 and an outlet 32, and the outlet 32 ​​is connected to the water inlet 21; a connecting pipe, wherein the connecting pipe is used to connect the water outlet 22 with the inlet 31; a connecting pipe 44, a pump 5, wherein the pump 5 is arranged on the connecting pipe, and the pump 5 is used to drive the water in the connecting pipe to flow; a heating component 46, wherein the heating component 46 can be used to heat the water storage tank 3.

[0076] The gas water heater may further include a connecting pipe 44. The connecting pipe 44 is used to connect the outlet 32 ​​of the cavity and the water inlet 21 of the heat exchanger 2.

[0077] Specifically, the heating component 46 can be arranged at least one of the following: on the water tank 3, on the connecting pipe near the water tank 3, and on the connecting pipe 44. Of course, in the embodiment of the present application, it is not excluded that the heating component 46 is arranged at other positions capable of heating the water tank 3. The technicians in the technical field may make other changes under the guidance of the technical essence of the present application, but as long as the functions and effects achieved are the same or similar to those of the present application, they should be included in the protection scope of the present application.

[0078] In this embodiment, the gas water heater mainly includes: a heat exchanger 2, a burner 1, a water storage tank 3, a connecting pipeline, a connecting pipe 44, a pump 5 and a heating component 46.

[0079] The heat generated by the burner 1 burning the gas can be used to heat the fluid flowing through the heat exchanger 2. Specifically, the burner 1 can be a burner with adjustable combustion load.

[0080] The heat exchanger 2 is used to circulate the fluid to be heated, and the heat exchanger 2 heats the fluid flowing through it through the heat generated by the combustion of the burner 1. Generally, the fluid can be water, but it is not excluded that it can also be a mixture of water and steam, or in the form of other fluids. In the following embodiments, the fluid is described by taking water as an example, and other fluid forms can be referred to by analogy. The specific application will not be repeated here.

[0081] The heat exchanger 2 may have a water inlet 21 and a water outlet 22. Water can enter the heat exchanger 2 from the water inlet 21, and after exchanging heat with the high-temperature flue gas generated by the burner 1 in the process of flowing through the heat exchanger 2, it flows out from the water outlet 22. The specific form of the heat exchanger 2 may be a tubular heat exchanger 2. Of course, the heat exchanger 2 may also be a finned heat exchanger 2, or a plate heat exchanger 2, etc. The shape, structure, etc. of the heat exchanger 2 may vary according to different actual use scenarios, and the present application does not make any specific limitation here.

[0082] Specifically, the heat exchanger 2 can be a stainless steel heat exchanger 2. When the heat exchanger 2 is made of stainless steel, it can not only ensure that the heat exchanger 2 has better heat exchange performance, but also ensure that the heat exchanger 2 has higher reliability during use, can withstand high temperatures and can resist corrosion.

[0083] The water storage tank 3 may be a hollow cavity structure, which may include a cavity for containing water. By using the hot water above a predetermined temperature stored in the water storage tank 3, hot water can be provided to the user at the fastest speed.

[0084] Among them, the volume of the water tank 3 can be between 1 liter and 3 liters. When the volume of the water tank 3 is above 1 liter, it can meet most of the short-term water needs of users, and the subsequent relay heating with the burner 1 can realize the continuous provision of hot water with constant temperature to users; theoretically, the larger the volume of the water tank 3, the more conducive it is to reduce the start-up frequency of the burner 1 after preheating, avoid frequent start-up and combustion noise, and reduce the service life of equipment such as ignition needles; at the same time, it can also improve the water mixing ability of the water tank 3 and improve the constant temperature experience of water use. When the volume of the water tank 3 is controlled within 3 liters, the volume of the gas water heater itself will not be increased too much. Of course, the volume of the water tank 3 is mainly determined by the size of the shell of the current gas water heater and the arrangement of the various parts inside the shell. When the above-mentioned influencing factors change, the volume of the water tank 3 can also be set larger.

[0085] Specifically, the shape and structure of the water storage tank 3 can be adaptively set according to the space inside the gas water heater, etc., and the present application does not make specific limitations here. The water storage tank 3 can be a stainless steel shell. When the shell is made of stainless steel, it can ensure that the water storage tank 3 has high reliability when in use, can withstand high temperatures and corrosion, and is also conducive to improving the thermal insulation performance of the water storage tank 3.

[0086] In the direction of water flow, the water storage tank 3 can be located upstream of the heat exchanger 2 or downstream of the heat exchanger 2. Figure 1As shown, when the water tank 3 is located upstream of the heat exchanger 2, the water tank 3 has an inlet 31 and an outlet 32, and the outlet 32 ​​of the water tank 3 is connected to the water inlet 21 of the heat exchanger 2, so that the water flowing out of the outlet 32 ​​of the water tank 3 can flow into the heat exchanger 2.

[0087] In some embodiments, the water storage tank 3 may further include: a heat exchange mechanism 30, wherein the interior of the heat exchange mechanism 30 is used for circulating flue gas, and the flue gas entering the heat exchange mechanism 30 can exchange heat with the water contained in the water storage tank 3 through the heat exchange mechanism 30, thereby making full use of the waste heat in the flue gas.

[0088] In addition, the water storage tank 3 may also be provided with a heat preservation structure, by which the water in the water storage tank 3 is kept warm. Specifically, the heat preservation structure may be formed by the cooperation of the heat exchange mechanism 30 and the water storage tank 3. For example, the gap between the heat exchange mechanism 30 and the water storage tank 3 may serve as a natural heat preservation structure of the water storage tank 3, which can achieve a better heat preservation effect while efficiently utilizing the waste heat of the flue gas and improving the heat exchange efficiency.

[0089] Furthermore, the gas water heater may also include a fan 9, which is used to provide a driving force for the airflow. Specifically, the structure of the fan 9 itself and its location and manner of setting may vary according to different actual usage scenarios, and the present application does not make specific limitations here. For example, the fan 9 may specifically be a variable frequency fan 9. The rotation speed of the fan 9 may be adaptively changed with changes in conditions such as combustion load. The outlet 32 ​​of the fan 9 is connected to the heat exchange mechanism 30, and at least part of the flue gas generated by the burner 1 can be introduced into the heat exchange mechanism 30 through the fan 9 after flowing through the heat exchanger 2.

[0090] The heat exchange mechanism 30 of the water storage tank 3 can be arranged downstream of the heat exchanger 2 along the flue gas flow direction. After the high-temperature flue gas generated by the burner 1 exchanges heat with the heat exchanger 2, it can flow through the heat exchange mechanism 30 and continue to exchange heat with the heat exchange mechanism 30, thereby ensuring that the gas water heater has a high heat exchange efficiency and achieving an ideal energy-saving and environmental protection effect.

[0091] Specifically, the heat exchange mechanism 30 may include a heat exchange tube, the interior of which is used to circulate flue gas. The heat exchange tube of the heat exchange mechanism 30 is inserted into the cavity of the water storage tank 3. When the flue gas flows through the heat exchange tube, it can efficiently exchange heat with the water contained in the water storage tank 3 without occupying too much internal space of the gas water heater.

[0092] Specifically, the heat exchange tube can be a plurality of heat exchange tubes connected in parallel. Each heat exchange tube can extend longitudinally along a first direction (such as a horizontal direction, etc., and the first direction is not limited solely in this application), and a certain distance can be spaced between two adjacent heat exchange tubes. The plurality of heat exchange tubes are distributed in an array in the water storage tank 3. When the flue gas enters the shell of the water storage tank 3, the flue gas can flow through the plurality of heat exchange tubes at the same time, that is, the flue gas is circulated through the plurality of heat exchange tubes to efficiently exchange heat with the water in the water storage tank 3.

[0093] Furthermore, the ratio of the volume of the heat exchange tube passing through the water tank 3 to the volume of the water tank 3 can be in the range of 1 / 3 to 1 / 2, thereby ensuring that the water in this volume is in full contact with the heat exchange tube, achieving secondary full utilization of the flue gas energy, and ensuring that the flue gas and water have a high heat exchange efficiency. At the same time, by reasonably controlling the size and ratio of the volume of the heat exchange tube and the water tank 3, too much space inside the gas water heater will not be occupied, thereby affecting the volume of the gas water heater.

[0094] Specifically, the heat exchange tubes inserted in the water storage tank 3 can be stainless steel heat exchange tubes. When the heat exchange tubes are made of stainless steel, it can also ensure that the heat exchange tubes have better heat exchange performance, and the heat exchange tubes have higher reliability when in use, and can withstand high temperatures and corrosion.

[0095] In one embodiment, the heat exchange mechanism 30 has a smoke outlet 32 ​​and a smoke inlet 31, and a cover plate 95 is provided at or near the smoke outlet 32. The cover plate 95 is used to open the smoke outlet 32 ​​when the fan 9 is in the started state; when the fan 9 is in the stopped state, the cover plate 95 closes the smoke outlet 32.

[0096] In this embodiment, the cover plate 95 can be opened or closed as the fan 9 is turned on or off, that is, the cover plate 95 can be a structure that can be opened or closed along with the flow of smoke.

[0097] When the gas water heater stops burning and the fan 9 stops running, the cover 95 at the smoke outlet 32 ​​or at a downstream position near the smoke outlet 32 ​​can be switched from an open state to a closed state, thereby preventing external wind (especially cold wind with a lower temperature) from flowing back into the water tank 3 through the smoke exhaust pipe 94 and affecting the insulation effect of the water tank 3.

[0098] The connecting pipeline is used to connect the water outlet 22 of the heat exchanger 2 with the inlet 31 of the water storage tank 3. Specifically, the connecting pipeline may include: a first pipeline water inlet pipeline connected to the inlet 31 of the water storage tank 3, a second pipeline water outlet pipeline connected to the water outlet 22 of the heat exchanger 2, and a bypass pipeline 43 connected between the first pipeline 41 of the water inlet pipeline and the second pipeline 42 of the water outlet pipeline.

[0099] Among them, for the gas water heater, it can include a water inlet pipeline and a water outlet pipeline. The water inlet pipeline can connect the external water source with the water storage tank 3 and the heat exchanger 2, so as to provide water to be heated to the gas water heater. The first pipeline 41 is part of the water inlet pipeline, and the second pipeline 42 is part of the water outlet pipeline.

[0100] The water outlet pipeline can connect the water outlet 22 of the heat exchanger 2 with the user's water terminal, so as to provide the water heated by the gas water heater to the water terminal. One end of the bypass pipeline 43 can be connected to the water outlet pipeline and the other end of the bypass pipeline 43 can be connected to the water inlet pipeline.

[0101] The material of the connecting pipeline may include stainless steel. When the material of the connecting pipeline is stainless steel, the connecting pipeline can have better heat exchange performance and can ensure that the connecting pipeline has higher reliability during use and can withstand high temperatures and corrosion.

[0102] The connecting pipe 44 is used to connect the outlet 32 ​​of the cavity with the water inlet 21 of the heat exchanger 2. Specifically, the material of the connecting pipe 44 can also include stainless steel. When the material of the connecting pipe 44 is stainless steel, the connecting pipe 44 can have better heat exchange performance, and can ensure that the connecting pipe 44 has higher reliability when in use, can withstand high temperature and can resist corrosion.

[0103] The pump 5 can be arranged on the connecting pipeline to provide driving force for the flow of water. When the driving device is started, the water in the water storage tank 3, the connecting pipe 44, the heat exchanger 2 and the connecting flow channel circulates to form an internal circulation water circuit.

[0104] In the water flow direction, the water storage tank 3 and the heat exchanger 2 can be connected in series. Figure 1 As shown, when the water storage tank 3 is located upstream of the heat exchanger 2, driven by the pump 5, water can circulate through the water storage tank 3, the connecting pipe 44, the heat exchanger 2, the second pipeline 42, the bypass pipeline 43 and the first pipeline 41 in sequence and then return to the water storage tank 3 to form an internal circulation water circuit.

[0105] When the water tank 3 is in some special working conditions, such as low temperature environment, including low temperature static environment, low temperature backflow wind and other working conditions, the water in the water tank 3 is kept warm for a short time. The water temperature of the water tank 3 may have dropped to a lower temperature within 30 minutes. In order to maintain the water temperature in the water tank 3, the method adopted may be to start the burner 1 for combustion and supplementary heat. However, when the burner 1 is frequently started for heating, noise will be generated to disturb the user, especially at night when the user is resting and the surrounding environment is relatively quiet. At this time, the gas water heater is frequently started for combustion, and the pump 5 is started for internal circulation at the same time to increase the water temperature of the internal circulation waterway (especially the water tank 3). It is very likely to affect the user's experience, and it will also affect the service life of the gas water heater itself.

[0106] In order to solve the above problems, the gas water heater provided in the embodiment of the present application is provided with a heating component 46 on the water tank 3 and / or on a pipeline close to the water tank 3 (for example, on a connecting pipeline between the water outlet 22 of the heat exchanger 2 and the inlet 31 of the water tank 3, a connecting pipe 44 between the outlet 32 ​​of the water tank 3 and the water inlet 21 of the heat exchanger 2), so as to effectively slow down the cooling speed of the water tank 3, thereby increasing the insulation time of the water tank 3, and further effectively reducing the frequency of starting the machine, avoiding noise interference to users, and ensuring stable operation of the machine even in a low temperature environment, thereby better ensuring the user experience.

[0107] Among them, the condition for starting the heating component 46 can be a temperature condition. For example, the gas water heater also includes a controller, which stores a preset heating condition. When the temperature detected by the temperature detection device of the gas water heater meets the preset heating condition, the controller starts the heating component 46 to increase the water temperature in the water storage tank 3 for auxiliary insulation.

[0108] The condition for starting the heating component 46 may also be other conditions, such as time conditions. The gas water heater further includes a controller, which may be provided with a timing module. The gas water heater may use the timing module to time after the internal circulation is stopped for the last time. When the predetermined time is reached, the heating component 46 is started to increase the water temperature in the water storage tank 3 for auxiliary heat preservation.

[0109] Of course, the conditions for starting the heating component 46 can also be other conditions and are not limited to the above description. Technical personnel in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0110] In an embodiment, at least part of the heating component 46 can be set on the water tank 3, for example, it can be set on the outer surface of the water tank 3, or it can be set inside the water tank 3, or it can be set through the water tank 3; or it can be a combination of the above-mentioned multiple setting positions.

[0111] See also Figure 4 In the case where the heating component 46 is arranged on the outer surface of the water tank 3, the heating component 46 can be directly attached to the outer surface of the water tank 3. For example, when the outer shell of the water tank 3 is a box-type structure as a whole, it can include a relative top wall and a bottom wall and a side wall arranged between the top wall and the bottom wall. The heating component 46 can include at least one electric heating element, and the electric heating element can be directly attached to the outer surface of the water tank. For example, when there are multiple electric heating elements, the multiple electric heating elements can be dispersed on the outer shell of the water tank 3, wherein the distribution position of the electric heating element on the outer shell of the water tank 3 is not specifically limited in this application. In some embodiments, the electric heating element can be arranged on the top wall of the water tank 3, or on the side wall close to the top wall of the water tank 3, so that the water near the upper part of the water tank 3 can be heated preferentially, and the outlet water temperature of the water tank 3 can be increased at a faster speed.

[0112] When the heating component 46 is started, it can transfer heat to the water in the water tank 3 through the outer shell of the water tank 3, and it itself does not contact the water in the water tank 3, which can reduce the waterproof sealing requirements for the heating component 46 and is also easy to install and maintain.

[0113] In addition, at least part of the heating assembly 46 may also be arranged on the connecting pipe near the water storage tank 3, or at least part of the heating assembly 46 may also be arranged on the connecting pipe 44 near the water storage tank 3. Specifically, in order to uniformly heat the water in the water storage tank 3 using the heating assembly 46, the heating assembly 46 may be arranged near the inlet 31 and / or outlet 32 ​​of the cavity. For example, the heating assembly 46 may be arranged near the inlet 31 of the cavity, may be arranged near the outlet 32 ​​of the cavity, and may also be arranged near both the inlet 31 and outlet 32 ​​of the cavity.

[0114] In a specific embodiment, the water storage tank 3 includes a water inlet joint 410 connected to the inlet 31 and a water outlet joint 420 connected to the outlet 32 ​​, and the heating component 46 is disposed on the outer surface of the water inlet joint 410 and / or the water outlet joint 420 .

[0115] In this embodiment, the water storage tank 3 can be provided with a water inlet joint 410 connected to the inlet 31 and a water outlet joint 420 connected to the outlet 32, one end of the water inlet joint 410 extends into the cavity, and the other end is located outside the cavity, and one end of the water outlet joint 420 extends into the cavity, and the other end is located outside the cavity.

[0116] The heating component 46 can be disposed on the outer surface of the water inlet joint 410 , can be disposed on the outer surface of the water outlet joint 420 , or can be disposed on the outer surfaces of both the water inlet joint 410 and the water outlet joint 420 .

[0117] For example, taking the heating component 46 disposed on the outer surface of the water outlet joint 420 as an example, after being started, the heating component 46 disposed on the outer surface of the water outlet joint 420 can transfer heat to the water outlet joint 420, and use the water outlet joint 420 as an intermediate transition piece to evenly transfer heat to the water in the water storage tank 3; and the heating component 46 itself does not need to contact the water, which can ensure its reliability during operation. In addition, when the heating component 46 is disposed at the water outlet joint 420, the heating component 46 can be used to quickly increase the water temperature near the water outlet joint 420, thereby facilitating the increase of the outlet water temperature of the water storage tank 3 in the shortest time.

[0118] When the heating component 46 is arranged on the outer surface of the water inlet joint 410, the heating component 46 arranged on the outer surface of the water inlet joint 410 can transfer heat to the water inlet joint 410 after startup, and use the water inlet joint 410 as an intermediate transition piece to evenly transfer heat to the water in the water storage tank 3; and the heating component 46 itself does not need to come into contact with water, which can ensure its reliability during operation.

[0119] In one embodiment, the heating assembly 46 includes at least one electric heating element, and the power of the heating assembly 46 ranges from 20 watts to 50 watts.

[0120] In this embodiment, the heating component 46 is specifically in the form of electric heating, which may include at least one electric heating element. Specifically, the power range of the heating component 46 may be between 20 watts and 50 watts, forming a low-power auxiliary electric heating and heat preservation system, which can improve the heat preservation time of the water storage tank 3 in a low temperature environment, thereby effectively reducing the machine startup frequency. When the power of the heating component 46 is too small, for example, less than 20 watts, it may not be able to effectively increase the cooling speed of the water storage tank 3 in a low temperature environment; when the power of the heating component 46 is too large, for example, greater than 50 watts, the temperature of the water storage tank 3 may be rapidly increased in a short period of time, which may lead to risks such as overheating.

[0121] In one embodiment, a water inlet joint 410 is provided at the inlet 31 of the cavity to connect the water inlet pipeline with the cavity, a water outlet joint 420 is provided at the outlet 32 ​​of the cavity to connect the connecting pipe 44 with the cavity, and the water inlet joint 410 and / or the water outlet joint 420 are provided with a mounting portion 45. When the heating component 46 is started, the heating component 46 can transfer heat to the water inlet joint 410 and / or the water outlet joint 420 through the mounting portion 45.

[0122] In this embodiment, at least one of the water inlet connector 410 and the water outlet connector 420 is provided with a mounting portion 45. Specifically, taking the case where both the water inlet connector 410 and the water outlet connector 420 are provided with mounting portions 45, the mounting portion 45 may include a plurality of mounting portions 45, and the plurality of mounting portions 45 may be fixed to the outside of the water inlet connector 410 and the water outlet connector 420, respectively; in addition, the mounting portion 45 may also be an integral mounting portion 45, and the integral mounting portion 45 may be fixed to the outside of the water inlet connector 410 and the water outlet connector 420.

[0123] The specific shape and structure of the mounting portion 45 are not specifically limited in this application. For example, when the mounting portion 45 is an integral mounting portion 45, the mounting portion 45 may be a mounting plate sleeved on the outside of the water inlet joint 410 and the water outlet joint 420. When the mounting portion 45 is in the form of multiple independently arranged portions, the mounting portion 45 may include a clamping ring structure sleeved on the water inlet joint 410 and the water outlet joint 420.

[0124] Specifically, the mounting portion 45 may include a mounting hole, into which the heating component 46 can be inserted. When the heating component 46 is inserted into the mounting hole, the outer surface of the heating component 46 can fully contact the mounting portion 45, thereby facilitating the heat exchange effect between the heating component 46 and the mounting portion 45.

[0125] The mounting portion 45 may be provided with a mounting hole for mounting the heating component 46. For example, when the mounting portion 45 is a mounting plate, the mounting plate may be provided with a mounting hole, and the heating component 46 may be inserted into the mounting hole. For example, when the mounting portion 45 is a clamping ring, the clamping ring may be provided with a mounting hole, and the heating component 46 may be inserted into the mounting hole.

[0126] In addition, in order to ensure the reliability of installation, the heating assembly 46 can also be fixed in the mounting hole by adding a connecting piece. The specific form of the connecting piece can be a screw. Of course, the connecting piece can also be other forms, and this application does not make the sole limitation here.

[0127] like Figure 2As shown, in one embodiment, the heating assembly 46 includes at least a first electric heating element 461 and a second electric heating element 462 , wherein the first electric heating element 461 is disposed close to the water inlet joint 410 , and the second electric heating element 462 is disposed close to the water outlet joint 420 .

[0128] In this embodiment, the heating component 46 may include at least two electric heating elements. When the heating component includes at least two electric heating elements, the multiple electric heating elements may be dispersedly arranged, thereby being more conducive to uniformly heating the water in the water storage tank 3.

[0129] Specifically, the heating assembly 46 may include a first electric heating element 461 disposed near the water inlet joint 410 and a second electric heating element 462 disposed near the water outlet joint 420. The first electric heating element 461 may be used to transfer heat to the water inlet joint 410, and then the water in the water storage tank 3 near the water inlet joint 410 is heated through the water inlet joint 410, while the second electric heating element 462 may be used to transfer heat to the water outlet joint 420, and then the water in the water storage tank 3 near the water outlet joint 420 is heated through the water outlet joint 420. The water inlet joint 410 and the water outlet joint 420 may be staggered in at least one of the horizontal direction and the height direction in the water storage tank 3, so as to facilitate the first electric heating element 461 and the second electric heating element 462 to uniformly heat the water at different positions in the water storage tank 3.

[0130] like Figure 3 As shown, in one embodiment, the heating assembly 46 includes a first electric heating element 461, a second electric heating element 462 and a third electric heating element 463, and the first electric heating element 461, the second electric heating element 462 and the third electric heating element 463 are arranged at intervals beside the water inlet joint 410 and the water outlet joint 420.

[0131] The present embodiment is different from the above-mentioned embodiment mainly in that the number of electric heating elements included in the heating assembly 46 is different.

[0132] Specifically, the heating assembly 46 may include a first electric heating element 461, a second electric heating element 462 and a third electric heating element 463, wherein, when the mounting portion 45 is an integral structure, for example, when the mounting portion 45 is a mounting plate sleeved outside the water inlet joint 410 and the water outlet joint 420, the first electric heating element 461, the second electric heating element 462 and the third electric heating element 463 may be spaced apart and distributed along the horizontal direction, so as to uniformly heat the water in the water storage tank 3 through the mounting plate, the water inlet joint 410 and the water outlet joint 420. When the mounting portion 45 is a split structure, for example, when the mounting portion 45 includes a clamping ring sleeved outside the water inlet joint 410 and the water outlet joint 420, two of the electric heating elements may be arranged on the clamping ring of one joint, and another electric heating element may be arranged on the clamping ring of another joint. For example, two electric heating elements may be arranged on the clamping ring of the water inlet joint 410, and another electric heating element may be arranged on the clamping ring of the water outlet joint 420.

[0133] In a specific embodiment, the power of the first electric heating element 461, the second electric heating element 462 and the third electric heating element 463 are all 10 watts.

[0134] In this embodiment, the power of each electric heating element is relatively small, thereby ensuring that when the electric heating element is started, the instantaneous local temperature will not be too high, and ensuring that the location where the electric heating element is installed is not prone to scaling due to high temperature.

[0135] In addition, since the electric heating element of the present application is arranged close to the water inlet joint 410 and the water outlet joint 420, after the gas water heater is used for a long time, even if a small amount of scale appears at the water inlet joint 410 and the water outlet joint 420, the water inlet joint 410 and the water outlet joint 420 can be easily cleaned or replaced.

[0136] In one embodiment, the gas water heater may further include a control valve 8, and the gas water heater includes a normal water use mode and an internal circulation mode. When the gas water heater is in the internal circulation mode, the control valve 8 is in a first state to connect the internal circulation water circuit. When the gas water heater is in the normal water use mode, the control valve 8 is in a second state to allow water to flow from the water inlet pipe into the gas water heater and flow out of the gas water heater from the water outlet pipe.

[0137] In this embodiment, the gas water heater is provided with a control valve 8, and the normal water use mode and the internal circulation mode are switched by changing the state of the control valve 8. When the control valve 8 is in the first state, the water flow channel corresponding to the internal circulation waterway can be in a connected state, and when the pump 5 is started, the water in the internal circulation waterway can circulate. When the control valve 8 is in the second state, the water flow channel corresponding to the internal circulation waterway can be in a disconnected state or the water flow on the connecting pipeline can be reduced. At this time, starting the pump 5 can at least allow water to enter the gas water heater from the water inlet pipeline and flow out of the gas water heater through the water storage tank 3 and the heat exchanger 2 or through the heat exchanger 2 and the water storage tank 3 from the water outlet pipeline to supply to the user terminal.

[0138] In one embodiment, a first connection portion 91 is formed at the connection position between the water inlet pipe and the bypass pipe 43, a second connection portion 92 is formed at the connection position between the water outlet pipe and the bypass pipe 43, and the control valve 8 is arranged at any one of the following locations: in the bypass pipe 43, at the first connection portion 91, and at the second connection portion 92.

[0139] Specifically, the control valve 8 may include any one of the following: a switch valve or an electric water valve arranged on the bypass pipeline 43; a three-way valve arranged at the connecting portion between the water outlet pipeline and the bypass pipeline 43; a three-way valve arranged at the connecting portion between the water inlet pipeline and the bypass pipeline 43.

[0140] For example, when the control valve 8 is a switch valve provided on the bypass pipeline 43, when the water in the internal circulation water circuit needs to circulate, the switch valve is in a closed state so that the water in the bypass pipeline 43 can flow. When water needs to flow out of the water outlet pipeline to the user terminal, that is, when the user has a water demand, the switch valve is in an open state so that the water in the bypass pipeline 43 does not flow.

[0141] For example, when the control valve 8 is an electric water valve, the electric water valve is used to adjust the flow of water in the bypass pipeline 43. Specifically, the electric water valve can be in the form of an electric regulating valve capable of realizing stepless flow regulation. The electric water valve can be electrically connected to the controller, and the opening size of the electric water valve is adjusted according to the control signal of the controller, so as to realize the flow regulation of water in the bypass pipeline 43. Specifically, the specific form, shape, structure, etc. of the electric water valve are not specifically limited in this application. When the water in the inner circulation waterway is circulated, the electric water valve has a first opening so that the water in the bypass pipeline 43 is circulated. When water is used to flow out of the gas water heater from the water outlet pipeline, the electric water valve has a second opening smaller than the first opening so that the water in the bypass pipeline 43 does not circulate, or so that part of the water entering the gas water heater from the water inlet pipeline flows into the bypass pipeline 43 and part flows into the water storage tank 3.

[0142] For example, when the control valve 8 is a three-way valve, specifically, the three-way valve can be arranged at the connection (second connection part 92) between the water outlet pipe and the bypass pipe 43. When the water in the internal circulation water circuit needs to be circulated, the three-way valve connects the water outlet pipe with the bypass pipe 43.

[0143] Alternatively, the three-way valve can be arranged at the connection (first connection portion 91) between the water inlet pipeline and the bypass pipeline 43. When the water in the internal circulation water circuit needs to circulate, the three-way valve connects the bypass pipeline 43 with the water inlet pipeline.

[0144] In this embodiment, the specific setting method of the control valve 8 can also be other methods, not limited to the above description. Technical personnel in the relevant field may make other changes inspired by the technical essence of this application, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0145] In this embodiment, in order to obtain the water temperature and temperature difference in the inner circulation water circuit, a temperature detection device electrically connected to the controller can be set. The controller can determine the water temperature and temperature difference in the inner circulation water circuit based on the temperature signal obtained by the temperature detection device.

[0146] In this embodiment, in order to obtain the flow conditions in the internal circulation water circuit, a flow sensor 7 can be set. The flow sensor 7 is electrically connected to the controller. The controller can determine the flow conditions in the internal circulation water circuit based on the flow signal obtained by the flow sensor 7.

[0147] In one embodiment, the gas water heater may further include a first temperature detection device 61 disposed downstream of the second connection portion 92. When the temperature detected by the first temperature detection device 61 meets the first heating condition, the heating component 46 is started, the pump 5 is started for a certain period of time, and the water in the water storage tank 3, the heat exchanger 2 and the connecting pipeline circulates to form an internal circulation water circuit.

[0148] In this embodiment, the gas water heater may also be provided with a first temperature detection device 61, which may be provided at a downstream position of the second connection portion 92. Since the first temperature detection device 61 is closest to the outside, it is most affected by the external ambient temperature. When the ambient temperature of the gas water heater is installed is low, the temperature detected by the first temperature detection device 61 decays quickly, which can best reflect the ambient temperature of the current gas water heater. Therefore, the temperature signal detected by the first temperature detection device 61 can be compared with the preset first temperature rise condition. When the temperature detected by the first temperature detection device 61 meets the first temperature rise condition, the heating component 46 can be started to perform auxiliary heating to increase the water temperature in the water storage tank 3. In the process of starting the heating component 46 for auxiliary heating, the pump 5 can be started for a certain period of time to circulate the water in the water storage tank 3, the heat exchanger 2 and the connecting pipeline to form an internal circulation water circuit, so that the water temperature of the entire internal circulation water circuit is uniform to prevent the local temperature from being too high.

[0149] The first temperature rise condition may be pre-stored in the controller, for example, the first temperature rise condition may be: the temperature detected by the first temperature detection device 61 is lower than 25 degrees Celsius. Of course, the specific form and specific temperature boundary value of the first temperature rise condition are not limited in this application.

[0150] In one embodiment, the gas water heater also includes a second temperature detection device 62 arranged on the cavity; the second temperature detection device 62 is electrically connected to the controller, and when the temperature detected by the second temperature detection device 62 meets the second heating condition, the heating component 46 is started, the pump 5 is started for a certain period of time, and the water in the water storage tank 3, the heat exchanger 2 and the connecting pipeline circulates to form an internal circulation water circuit.

[0151] In some special scenarios, for example, when outdoor cold wind flows back into the exhaust pipe 94 in winter, the cold wind entering the exhaust pipe 94 will directly affect the temperature of the water tank 3, and the temperature at the water tank 3 decays faster. In order to accurately obtain the temperature change of the water tank 3, a second temperature detection device 62 can be set outside the cavity of the water tank 3. When the temperature detected by the second temperature detection device 62 meets the second temperature rise condition, the heating component 46 is started for auxiliary heating to increase the water temperature in the water tank 3. In the process of starting the heating component 46 for auxiliary heating, the pump 5 can be started for a certain period of time to circulate the water in the water tank 3, the heat exchanger 2 and the connecting pipeline to form an internal circulation water circuit, so that the water temperature of the entire internal circulation water circuit is uniform to prevent local excessive temperature.

[0152] The second heating condition may be pre-stored in the controller, for example, the second heating condition may be: when the temperature detected by the second temperature detection device 62 is lower than 15 degrees Celsius. Of course, the specific form and specific temperature boundary value of the second heating condition are not limited in this application.

[0153] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, and they cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0154] The above-mentioned various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0155] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. A gas water heater, characterized in that: The gas water heater comprises: A heat exchanger, wherein the heat exchanger has a water inlet and a water outlet, and a heat exchange flow channel for circulating water is provided between the water inlet and the water outlet; A burner, the burner is used to heat the water flowing through the heat exchange flow channel; A water storage tank, the water storage tank comprising a cavity for containing water, the cavity having an inlet and an outlet, the outlet being connected to the water inlet; A connecting pipe, the connecting pipe is used to connect the water outlet with the inlet; A pump, the pump being arranged on the communicating pipeline and being used for driving the water in the communicating pipeline to flow; A heating component can be used to heat the water storage tank.

2. The gas water heater according to claim 1, characterized in that: The gas water heater further comprises a connecting pipe, which is used to connect the outlet of the cavity and the water inlet of the heat exchanger; The heating component is arranged on at least one of the following: on the water storage tank, on the connecting pipeline close to the water storage tank, or on the connecting pipe.

3. The gas water heater according to claim 2, characterized in that: The connecting pipeline includes a first pipeline connected to the inlet of the water storage tank, a second pipeline connected to the water outlet of the heat exchanger, and a bypass pipeline connected between the first pipeline and the second pipeline.

4. The gas water heater according to claim 3, characterized in that: The gas water heater comprises a water inlet pipeline connected to the inlet of the water storage tank and a water outlet pipeline connected to the water outlet of the heat exchanger, the first pipeline is part of the water inlet pipeline, and the second pipeline is part of the water outlet pipeline.

5. The gas water heater according to claim 2, characterized in that: The heating component is arranged near the inlet and / or outlet of the cavity.

6. The gas water heater according to claim 1, characterized in that: The water storage tank comprises a water inlet joint connected to the inlet and a water outlet joint connected to the outlet, and the heating component is arranged on the outer surface of the water inlet joint and / or the water outlet joint.

7. The gas water heater according to claim 2, characterized in that: The heating assembly is arranged on the outer surface of the water storage tank.

8. The gas water heater according to claim 1, characterized in that: The heating assembly includes at least one electric heating element, and the power of the heating assembly ranges from 20 watts to 50 watts.

9. The gas water heater according to claim 4, characterized in that: The inlet of the cavity is provided with a water inlet joint for connecting the water inlet pipeline with the cavity, and the outlet of the cavity is provided with a water outlet joint for connecting the connecting pipe with the cavity. The water inlet joint and / or the water outlet joint are provided with a mounting portion for mounting the heating component. When the heating component is started, the heating component can transfer heat to the water inlet joint and / or the water outlet joint through the mounting portion.

10. The gas water heater according to claim 9, characterized in that: The mounting portion includes a mounting hole, and the heating assembly can be inserted into the mounting hole.

11. The gas water heater according to claim 9, characterized in that: The heating assembly comprises at least a first electric heating element and a second electric heating element, wherein the first electric heating element is arranged close to the water inlet joint, and the second electric heating element is arranged close to the water outlet joint.

12. The gas water heater according to claim 9, characterized in that: The heating assembly comprises a first electric heating element, a second electric heating element and a third electric heating element, and the first electric heating element, the second electric heating element and the third electric heating element are arranged at intervals beside the water inlet joint and the water outlet joint.

13. The gas water heater according to claim 4, characterized in that: The gas water heater also includes a control valve, which includes a normal water use mode and an internal circulation mode. When the gas water heater is in the internal circulation mode, the control valve is in a first state to connect the internal circulation water circuit. When the gas water heater is in the normal water use mode, the control valve is in a second state to allow water to flow from the water inlet pipe into the gas water heater and flow out of the gas water heater from the water outlet pipe.

14. The gas water heater according to claim 13, characterized in that: A first connection portion is formed at a connection position between the water inlet pipeline and the bypass pipeline, and a second connection portion is formed at a connection position between the water outlet pipeline and the bypass pipeline. The control valve is disposed at any one of the following locations: in the bypass line, at the first connection portion, and at the second connection portion.

15. The gas water heater according to claim 14, characterized in that: The gas water heater further comprises a first temperature detection device arranged downstream of the second connection portion, When the temperature detected by the first temperature detection device meets the first temperature rising condition, the heating component is started, the pump is started for a certain period of time, and the water in the water storage tank, the heat exchanger and the connecting pipeline circulates to form an internal circulation water circuit.

16. The gas water heater according to claim 14, characterized in that: The gas water heater also includes a second temperature detection device arranged on the cavity; when the temperature detected by the second temperature detection device meets the second heating condition, the heating component is started, the pump is started for a certain period of time, and the water in the water storage tank, the heat exchanger and the connecting pipeline circulates to form an internal circulation water circuit.

17. The gas water heater according to claim 1, characterized in that: The water storage tank further comprises: a heat exchange mechanism, wherein the interior of the heat exchange mechanism is used for flue gas to circulate, and the flue gas entering the heat exchange mechanism can exchange heat with the water contained in the cavity through the heat exchange mechanism.

18. The gas water heater according to claim 17, characterized in that: The gas water heater further comprises a fan, the outlet of which is connected to the heat exchange mechanism. At least part of the flue gas generated by the burner can be introduced into the heat exchange mechanism through the fan after flowing through the heat exchanger.

19. The gas water heater according to claim 18, characterized in that: The heat exchange mechanism comprises a heat exchange smoke pipe, and the heat exchange smoke pipe of the heat exchange mechanism is penetrated in the cavity.

20. The gas water heater according to claim 18, characterized in that: The heat exchange mechanism has a smoke outlet and a smoke inlet, and a cover plate is arranged at or near the smoke outlet. The cover plate is used to open the smoke outlet when the fan is in the starting state; when the fan is in the stopping state, the cover plate is used to close the smoke outlet.

21. The gas water heater according to claim 1, characterized in that: The volume of the cavity is between 1 liter and 3 liters.

22. The gas water heater according to claim 1, characterized in that: The water storage tank, the heat exchanger and the connecting pipeline are made of stainless steel.

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