Gas water heater

Abstract

The utility model discloses a gas water heater. The gas water heater comprises a shell; a heat exchanger; a burner; the water inlet pipeline is connected with a water inlet of the heat exchanger; the water outlet pipeline is connected with a water outlet of the heat exchanger; the parallel pipeline is communicated with the water inlet pipeline and the water outlet pipeline and is arranged in parallel with the water flow channel in the heat exchanger; the water storage tank is arranged on the water inlet pipeline between the communicating part of the parallel pipeline and the water inlet pipeline and the water inlet of the heat exchanger or arranged on the water outlet pipeline between the communicating part of the parallel pipeline and the water outlet pipeline and the water outlet of the heat exchanger; the parallel pipeline, the water inlet pipeline and the water outlet pipeline form a communicating pipeline for communicating the water inlet and the water outlet of the heat exchanger; a water pump is arranged on the communicating pipeline; the first temperature detection component is used for detecting the water outlet temperature of the water storage tank. According to the application, the water use experience of instant heating of outlet water of a user can be improved from multiple angles, and the requirements of short-time multi-time intermittent water use and long-time constant-temperature water use can be better met.

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 burner, 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 take up 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. In addition, some other prior arts also hope to meet the user's demand for instant hot water by improving gas water heaters, but there are more or less some problems.

[0006] Overall, there is still room for improvement and optimization in the solutions in the prior art. Therefore, it is necessary to propose a gas water heater to solve the above problems. Utility Model Content

[0007] In view of the defects existing in the prior art, a gas water heater is provided in the embodiment of the utility model, which can improve the user's water experience of instant hot water from multiple angles, and can better meet the needs of short-term and multiple intermittent water use and long-term constant temperature water use.

[0008] The specific technical solution of the implementation mode of the utility model is:

[0009] A gas water heater, the gas water heater comprising: a shell; a heat exchanger, the heat exchanger having a water inlet and a water outlet; a burner for supplying heat energy to the heat exchanger; a water inlet pipeline connected to the water inlet of the heat exchanger; a water outlet pipeline connected to the water outlet of the heat exchanger; a parallel pipeline connected to the water inlet pipeline and the water outlet pipeline and arranged in parallel with a water flow channel in the heat exchanger; a water storage tank, the water storage tank is arranged on the water inlet pipeline between the connecting portion of the parallel pipeline and the water inlet pipeline and the water inlet of the heat exchanger or on the water outlet pipeline between the connecting portion of the parallel pipeline and the water outlet pipeline and the water outlet of the heat exchanger; the parallel pipeline, the connecting portion arranged between the parallel pipeline and the water inlet pipeline The water inlet pipeline between the water inlet of the heat exchanger and the water outlet pipeline, and the water outlet pipeline between the connecting part between the parallel pipeline and the water outlet pipeline and the water outlet of the heat exchanger form a connecting pipeline connecting the water inlet of the heat exchanger and the water outlet of the heat exchanger; a water pump is provided on the connecting pipeline, and the water pump is used to drive the water in the connecting pipeline and the water flow channel of the heat exchanger to circulate internally; a flow detection component, which is arranged on the water inlet pipeline between the connecting part between the parallel pipeline and the water inlet pipeline and the water inlet of the heat exchanger or on the water outlet pipeline between the connecting part between the parallel pipeline and the water outlet pipeline and the water outlet of the heat exchanger; a first temperature detection component for detecting the outlet water temperature of the water storage tank.

[0010] In a preferred embodiment, the gas water heater further comprises: a second temperature detection component for detecting the water inlet temperature of the water storage tank.

[0011] In a preferred embodiment, in the water flow direction, the water storage tank is located upstream of the heat exchanger, and the first temperature detection component is arranged on the water inlet pipeline between the outlet of the water storage tank and the water inlet of the heat exchanger.

[0012] In a preferred embodiment, the second temperature detection component is disposed on the water inlet pipeline between the parallel pipeline and the connecting portion of the water inlet pipeline to the inlet of the water storage tank.

[0013] In a preferred embodiment, the gas water heater also includes a third temperature detection component for obtaining the outlet water temperature of the heat exchanger, and the third temperature detection component is arranged on the water outlet pipeline between the connecting part of the parallel pipeline and the water outlet pipeline to the water outlet of the heat exchanger.

[0014] In a preferred embodiment, in the water flow direction, the water storage tank is located downstream of the heat exchanger, and the first temperature detection component is arranged on the water outlet pipeline between the outlet of the water storage tank and the connecting part between the parallel pipeline and the water outlet pipeline.

[0015] In a preferred embodiment, the second temperature detection component is disposed on the water outlet pipeline between the water outlet of the heat exchanger and the inlet of the water storage tank.

[0016] In a preferred embodiment, the gas water heater also includes a third temperature detection component for obtaining the water inlet temperature of the heat exchanger, and the third temperature detection component is arranged on the water inlet pipeline between the connecting part of the parallel pipeline and the water inlet pipeline to the water inlet of the heat exchanger.

[0017] In a preferred embodiment, the water storage tank further comprises a heat exchange component, wherein the interior of the heat exchange component is used for flue gas to circulate, and the flue gas entering the heat exchange component can exchange heat with the water contained in the water storage tank through the heat exchange component.

[0018] In a preferred embodiment, along the flue gas flow direction, the heat exchange component is arranged downstream of the heat exchanger, and the flue gas generated by the burner exchanges heat with the heat exchanger before flowing into the heat exchange component.

[0019] In a preferred embodiment, the heat exchange component includes a heat exchange tube, and the heat exchange tube of the heat exchange component is inserted into the water storage tank.

[0020] In a preferred embodiment, the heat exchanger, the water storage tank, and the heat exchange component are all made of stainless steel.

[0021] 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, and the water pump can drive the connecting pipe and the water in the water flow channel of the heat exchanger to circulate internally; when the gas water heater is in the normal water use mode, the control valve is in a second state, and water enters the gas water heater from the water inlet pipe and flows out of the gas water heater from the water outlet pipe after passing through the water storage tank and the heat exchanger or passing through the heat exchanger and the water storage tank.

[0022] In a preferred embodiment, the control valve includes any one of the following: a switch valve or an electric water valve arranged on the parallel pipeline; a three-way valve arranged at the connecting part between the water outlet pipeline and the parallel pipeline; a three-way valve arranged at the connecting part between the water inlet pipeline and the parallel pipeline.

[0023] The technical solution of the utility model has the following significant beneficial effects:

[0024] In the embodiment of the present application, the inner circulation waterway formed by the water pump driving the water flow cooperates with the burner to form the preheating function of the gas water heater. Before the user uses water, a closed waterway is formed by the connecting pipe, and the water pump and the burner are started so that the water temperature in the inner circulation waterway reaches the outlet water temperature required by the user. When the user uses water later, the water with suitable temperature can be quickly obtained by opening the water terminal. In case of short-term water use by the user, the preheated water in the water tank of the inner circulation waterway can meet the user's use needs, and there is no need to frequently start the burner, reduce the noise of switching on and off, and extend the service life of related equipment such as the ignition needle. In addition, when the user uses water for a long time and the amount of preheated water in the water tank of the inner circulation waterway cannot meet the current user's hot water demand, the burner can be started during the user's water use process to ensure that the user can always obtain water with a temperature that meets the demand during the water use process, and the water temperature fluctuates less during the entire water use process, which can improve the user's use experience in many aspects.

[0025] 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

[0026] 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.

[0027] Figure 1 A schematic diagram of the structure of a gas water heater provided in an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the structure of another gas water heater provided in an embodiment of the present application.

[0029] Reference numerals of the present application:

[0030] 1. Shell;

[0031] 2. Heat exchanger; 21. Water inlet; 22. Water outlet;

[0032] 3. Water storage tank;

[0033] 41. Water inlet pipeline;

[0034] 42. Water outlet pipe;

[0035] 43. Parallel pipelines;

[0036] 5. Water pump;

[0037] 61. A first temperature detection component;

[0038] 62. A second temperature detection component;

[0039] 63. A third temperature detection component;

[0040] 7. Flow detection components;

[0041] 8. Control valve;

[0042] E, a first connecting portion;

[0043] F. Second connecting part. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] The utility model provides a gas water heater, which can improve the user's water use experience of instant hot water from multiple angles, and can better meet the needs of short-term multiple intermittent water use and long-term constant temperature water use.

[0048] Please refer to Figure 1 to Figure 2 In the embodiment of the present application, a gas water heater is provided, which may include: a housing 1; a heat exchanger 2, wherein the heat exchanger 2 has a water inlet 21 and a water outlet 22; a burner for supplying heat energy to the heat exchanger 2; a water inlet pipeline 41 connected to the water inlet 21 of the heat exchanger 2; a water outlet pipeline 42 connected to the water outlet 22 of the heat exchanger 2; and a water inlet pipeline 41 and a water outlet pipeline 42 connected to the water inlet pipeline 41 and the water outlet pipeline 42 and connected to the heat exchanger 2. a parallel pipe 43 arranged in parallel with the water flow channel of the heat exchanger 2; a water storage tank 3, the water storage tank 3 is arranged on the water inlet pipe 41 between the connecting portion between the parallel pipe 43 and the water inlet pipe 41 (hereinafter referred to as the first connecting portion E) and the water inlet 21 of the heat exchanger 2, or is arranged on the water outlet pipe 42 between the connecting portion between the parallel pipe 43 and the water outlet pipe 42 (hereinafter referred to as the second connecting portion F) and the water outlet 22 of the heat exchanger 2; the parallel pipe 43, the water storage tank 3 is arranged on the water inlet pipe 41 between the connecting portion between the parallel pipe 43 and the water inlet pipe 41 (hereinafter referred to as the first connecting portion E) and the water inlet 21 of the heat exchanger 2; The water inlet pipe 41 disposed between the parallel pipe 43 and the communicating portion of the water inlet pipe 41 and the water inlet 21 of the heat exchanger 2, and the water outlet pipe 42 disposed between the parallel pipe 43 and the communicating portion of the water outlet pipe 42 and the water outlet 22 of the heat exchanger 2 form a communicating pipe connecting the water inlet 21 of the heat exchanger 2 and the water outlet 22 of the heat exchanger 2; a water pump 5 is disposed on the communicating pipe, and the water pump 5 is used to drive the communicating pipe and the water outlet 22 of the heat exchanger 2. The water in the water flow channel of the heat exchanger 2 is internally circulated; a flow detection component 7, which is arranged on the water inlet pipeline 41 between the connecting portion of the parallel pipeline 43 and the water inlet pipeline 41 and the water inlet 21 of the heat exchanger 2 or on the water outlet pipeline 42 between the connecting portion of the parallel pipeline 43 and the water outlet pipeline 42 and the water outlet 22 of the heat exchanger 2; a first temperature detection component 61 for detecting the outlet water temperature of the water storage tank 3.

[0049] The connecting portion between the parallel pipeline 43 and the water inlet pipeline 41 is hereinafter referred to as the first connecting portion E; the connecting portion between the parallel pipeline 43 and the water outlet pipeline 42 is hereinafter referred to as the second connecting portion F.

[0050] In the embodiment of the present application, the gas water heater may include: a shell 1, a burner, a heat exchanger 2, a water storage tank 3, a water pump 5, a connecting pipe, a flow detection component 7 and a first temperature detection component 61, etc.

[0051] Among them, the shell 1 can be the outer shell of the gas water heater, and the above-mentioned burner, heat exchanger 2, water storage tank 3, water pump 5, connecting pipe, flow detection component 7 and first temperature detection component 61 can all be located in the shell 1. Of course, in some cases, it is not ruled out that part of the burner, heat exchanger 2, water storage tank 3, water pump 5, connecting pipe, flow detection component 7 and first temperature detection component 61 are located outside the shell 1.

[0052] The heat generated by the burner burning the gas can be used to heat the fluid flowing through the heat exchanger 2. Specifically, the burner can be a burner with adjustable combustion load.

[0053] 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 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. Of course, the heat exchanger 2 may also be a finned heat exchanger or a plate heat exchanger. The shape, structure, etc. of the heat exchanger 2 may vary according to different actual use scenarios, and the present application does not make specific limitations here.

[0054] Specifically, the heat exchanger 2 can be a stainless steel heat exchanger. 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.

[0055] 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.

[0056] 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 combustion 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 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 mixing capacity 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.

[0057] 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 1. When the shell 1 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 can resist corrosion.

[0058] 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 1 As shown, when the water tank 3 is located upstream of the heat exchanger 2, the water tank 3 has an inlet and an outlet, the outlet of the water tank 3 is connected to the water inlet 21 of the heat exchanger 2, and the water flowing out of the outlet of the water tank 3 can flow into the heat exchanger 2. Figure 2 As shown, when the water storage tank 3 is located downstream of the heat exchanger 2 , the water outlet 22 of the heat exchanger 2 is connected to the inlet of the water storage tank 3 , and the water flowing out of the water outlet 22 of the heat exchanger 2 can flow into the water storage tank 3 .

[0059] In some embodiments, the water storage tank 3 may further include: a heat exchange component, wherein the interior of the heat exchange component is used to circulate the flue gas, and the flue gas entering the heat exchange component can exchange heat with the water contained in the water storage tank 3 through the heat exchange component, thereby making full use of the waste heat in the flue gas.

[0060] 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 component and the water storage tank 3. For example, the gap between the heat exchange component 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 flue gas waste heat and improving the heat exchange efficiency.

[0061] Furthermore, the gas water heater may also include a fan, which is used to provide a driving force for the airflow. Specifically, the structure of the fan itself and its location and setting method may vary according to the actual use scenario, and the present application does not make specific limitations here. For example, the fan may specifically be a variable frequency fan. The speed of the fan can be adaptively changed with changes in conditions such as combustion load. The outlet of the fan is connected to the heat exchange component, and at least part of the flue gas generated by the burner can be introduced into the heat exchange component through the fan after passing through the heat exchanger 2.

[0062] The heat exchange component 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 exchanges heat with the heat exchanger 2, it can flow through the heat exchange component and continue to exchange heat with the heat exchange component, thereby ensuring that the gas water heater has a high heat exchange efficiency and achieves an ideal energy-saving and environmental protection effect.

[0063] Specifically, the heat exchange assembly may include a heat exchange tube, the interior of which is used to circulate flue gas. The heat exchange tube of the heat exchange assembly is arranged in 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] The connecting pipeline is used to connect the water outlet 22 of the heat exchanger 2 and the water inlet 21 of the heat exchanger 2. Specifically, the connecting pipeline may include: a parallel pipeline 43 connected with the water inlet pipeline 41 and the water outlet pipeline 42 and arranged in parallel with the water flow channel in the heat exchanger 2, a water inlet pipeline 41 arranged between the first connecting portion E and the water inlet 21 of the heat exchanger 2, and a water outlet pipeline 42 arranged between the second connecting portion F and the water outlet 22 of the heat exchanger 2.

[0068] Among them, for the gas water heater, it can include a water inlet pipeline 41 and a water outlet pipeline 42. The water inlet pipeline 41 can connect the external water source with the water inlet 21 of the heat exchanger 2, so as to provide the gas water heater with water to be heated. The water outlet pipeline 42 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 parallel pipeline 43 can be connected to the water outlet pipeline 42 and the other end of the parallel pipeline 43 can be connected to the water inlet pipeline 41.

[0069] The water pump 5 may be disposed on the connecting pipeline to provide a driving force for the water flow, and drive the water in the connecting pipeline and the water flow channel of the heat exchanger 2 to circulate internally.

[0070] In the water flow direction, the water storage tank 3 and the heat exchanger 2 are connected in series. Figure 1 As shown, when the water tank 3 is located upstream of the heat exchanger 2, driven by the water pump 5, water can sequentially pass through the water tank 3, the heat exchanger 2, the water outlet pipe 42, the parallel pipe 43 and the water inlet pipe 41 and then return to the water tank 3 for circulation, forming an internal circulation water circuit. Figure 2 As shown, when the water storage tank 3 is located downstream of the heat exchanger 2, driven by the water pump 5, water can pass through the heat exchanger 2, the water storage tank 3, the water outlet pipe 42, the parallel pipe 43, the water inlet pipe 41 in sequence and then return to the heat exchanger 2 for circulation, forming an internal circulation water circuit.

[0071] In this embodiment, the water inlet 21 and the water outlet 22 of the heat exchanger 2 are connected by providing a connecting pipe, so as to form a closed water circuit.

[0072] Specifically, after starting the water pump 5, an internal circulation water circuit can be established. When the burner is not started, the water temperature inside the gas water heater can be evenly treated, and the temperature difference of the water temperature at each position can be controlled within a smaller fluctuation range, ensuring that the water temperature will not fluctuate suddenly when the user uses the water again; when the burner is started at the same time, the water temperature inside the gas water heater can be increased to the water outlet temperature required by the user, so that when the user opens the water terminal, hot water with a water temperature that meets the requirements can be used, thereby achieving the purpose of improving the user experience from different angles.

[0073] In the embodiment of the present application, the inner circulation waterway formed by the water pump 5 driving the water flow cooperates with the burner to form the preheating function of the gas water heater. Before the user uses water, a closed waterway is formed by the connecting pipe, and the water pump 5 and the burner are started so that the water temperature in the inner circulation waterway reaches the outlet water temperature required by the user. When the user uses water later, the water with suitable temperature can be quickly obtained by opening the water terminal. In case of short-term water use by the user, the preheated water in the water storage tank 3 of the inner circulation waterway can meet the user's use needs, and there is no need to frequently start the burner, reduce the noise of switching on and off, and extend the service life of related equipment such as the ignition needle. In addition, when the user uses water for a long time and the amount of preheated water in the water storage tank 3 of the inner circulation waterway cannot meet the current user's hot water demand, the burner can be started during the user's water use process to ensure that the user can always obtain water with a temperature that meets the demand during the water use process, and the water temperature fluctuates less during the entire water use process, which can improve the user's use experience in many aspects.

[0074] Specifically, the water pump 5 can be a fixed frequency water pump or a variable frequency water pump. When the water pump 5 is a variable frequency water pump, the flow rate (flow velocity) in the internal circulation water circuit can be changed by adjusting the rotation speed of the water pump 5. The water pump 5 can use the existing water pump in the gas water heater or can be set separately. Figure 1 As shown, the water pump 5 can be arranged in part of the water inlet pipe 41. On the one hand, the water pump 5 can provide power for the water flow in the inner circulation waterway; on the other hand, the water pump 5 can also increase the water flow power when the user uses water. In addition, when the gas water heater is also provided with an outer circulation waterway, the water pump 5 can also provide driving force for the water in the outer circulation waterway.

[0075] In an embodiment, the gas water heater further includes a first temperature detection component 61 and a flow detection component 7 .

[0076] The first temperature detection component 61 is used to detect the outlet water temperature of the water storage tank 3. The flow detection component 7 is used to detect the water flow on the connecting pipeline. The flow detection component 7 can be arranged on the water inlet pipeline 41 between the first connecting portion E and the water inlet 21 of the heat exchanger 2 or on the water outlet pipeline 42 between the second connecting portion F and the water outlet 22 of the heat exchanger 2.

[0077] The gas water heater may also be provided with a controller, which may be electrically connected to the water pump 5, the burner, the first temperature detection component 61, the flow detection component 7, etc., and the controller may pre-store a first preset relationship between the user-set temperature, the combustion load of the burner, the flow in the connecting pipeline, and the water outlet temperature of the water storage tank 3. The user-set temperature may be pre-stored in the controller, or the pre-stored data may be updated according to the current user-set temperature. Specifically, this application does not make a sole limitation here.

[0078] When the first temperature detection component 61 is used to detect the outlet water temperature of the water tank 3, and the flow detection component 7 is used to detect the flow in the connecting pipeline, when the operating parameters of the water pump 5 are known to be a certain fixed value, the combustion load required by the current burner can be determined according to the above-mentioned first preset relationship, so that the combustion load of the burner automatically matches the current water temperature and flow conditions, and the water temperature can be quickly increased in the water tank 3. At the same time, the rate of change of the water temperature can be reasonably controlled. In particular, during the internal circulation process, if the user uses water midway, by matching the above-mentioned combustion load with the water temperature and flow, large jump fluctuations in the water temperature and even over-temperature problems can be prevented.

[0079] In addition, in some embodiments, the gas water heater may further include: a second temperature detection component 62 for detecting the water inlet temperature of the water storage tank 3 .

[0080] In this embodiment, the gas water heater may further include a second temperature detection component 62, which is used to detect the water inlet temperature of the water storage tank 3. The second temperature detection component 62 may also be electrically connected to the controller, and by obtaining the water inlet temperature of the water storage tank 3, the controller may identify the water temperature in the current connecting pipeline through the second temperature detection component 62.

[0081] The following examples are given for different upstream and downstream relationships between the water storage tank 3 and the heat exchanger 2.

[0082] like Figure 1 As shown, in the first embodiment, in the water flow direction, the water storage tank 3 is located upstream of the heat exchanger 2, and the first temperature detection component 61 is arranged on the water inlet pipeline 41 between the outlet of the water storage tank 3 and the water inlet 21 of the heat exchanger 2.

[0083] In this embodiment, along the water flow direction, the water storage tank 3 is located upstream of the heat exchanger 2 .

[0084] For the gas water heater, the flow cross section of its connecting pipe and the volume of the water tank 3 are all fixed parameters. Under the premise that these parameters are fixed, for the case where the water tank 3 is located upstream of the heat exchanger 2, when the preheating function is started, the burner and the water pump 5 are in working state, the burner first heats the water in the heat exchanger 2, and then the water pump 5 transports the heated water to the water tank 3 through the connecting pipe. At this stage, the water in the heat exchanger 2 will quickly heat up the water in the connecting pipe; subsequently, as the high-temperature water continues to enter the water tank 3, the water in the water tank 3 with a certain volume gradually heats up.

[0085] When the user does not start the preheating function of the gas water heater, the burner has not been started before the user uses water, and the water in the water tank 3 and the connecting pipes are all cold water. If the water tank 3 is set downstream of the heat exchanger 2, when the user needs water and turns on the water terminal (taking the faucet as an example), the hot water generated by the burner in the heat exchanger 2 cannot be quickly supplied to the water terminal, but flows into the water tank 3 to increase the water temperature in the water tank 3. The water flowing to the water terminal is the cold water in the water tank 3, and the larger the volume of the water tank 3, the longer it takes for the cold water to flow out to the water terminal.

[0086] In this embodiment, by arranging the water tank 3 upstream of the heat exchanger 2, and correspondingly, the heat exchanger 2 is located downstream of the water tank 3, the hot water generated by the burner in the heat exchanger 2 can be quickly supplied to the water terminal, which can prevent the water tank 3 with a certain volume from causing the water temperature to not reach the set temperature for a long time for the user. In the embodiment of the present application, by arranging the water tank 3 upstream of the heat exchanger 2, it can avoid the problem that the water temperature of the water tank 3 does not reach the set temperature for a long time for the user, that is, the volume of the water tank 3 is not limited, and the corresponding volume can be set according to the needs of the use scenario.

[0087] In this embodiment, the first temperature detection component 61 is disposed on the water inlet pipeline 41 between the outlet of the water storage tank 3 and the water inlet 21 of the heat exchanger 2, so that the temperature of water flowing out of the water storage tank 3 can be detected in real time.

[0088] In this embodiment, the water inlet 21 of the heat exchange tube of the heat exchanger 2 and the outlet of the water storage tank 3 can be connected through a section of water inlet pipeline 41. Specifically, the section of water inlet pipeline 41 can be a section of a hollow pipe body, one end of which can extend into the interior of the water storage tank 3, and the other end of which can be connected to the water inlet 21 of the heat exchanger 2.

[0089] Among them, the end of the water inlet pipe 41 extending into the water tank 3 can be used as the outlet of the water tank 3; the end of the water inlet pipe 41 between the first connecting portion E and the water tank 3 can also extend into the water tank 3, and the end of the water inlet pipe 41 extending into the water tank 3 can be used as the inlet of the water tank 3. The outlet height of the water tank 3 is higher than the inlet of the water tank 3, so that when the water tank 3 is mainly used to supply hot water to the water terminal, the water with lower temperature supplied from the outside can push the water with higher temperature in the water tank 3 upward, so that it flows out of the water tank 3 from the higher outlet, so that the hot water in the water tank 3 can be fully utilized.

[0090] When the water storage tank 3 is arranged upstream of the heat exchanger 2, the second temperature detection component 62 is arranged on the water inlet pipeline 41 between the parallel pipeline 43 and the connecting portion of the water inlet pipeline 41 to the inlet of the water storage tank 3. That is, the second temperature detection component 62 can be arranged in the water inlet pipeline 41 between the first connecting portion E and the inlet of the water storage tank 3, so that the water temperature flowing into the water storage tank 3 can be detected in real time.

[0091] The second temperature detection component 62 may also be electrically connected to the controller. By acquiring the water inlet temperature of the water storage tank 3 , the controller may identify the water temperature in the connecting pipe between the current water outlet 22 of the heat exchanger 2 and the inlet of the water storage tank 3 .

[0092] The controller may pre-store a second preset relationship between the user set temperature, the combustion load of the burner, the flow rate in the connecting pipeline, and the water inlet temperature of the water storage tank 3. After the flow rate in the connecting pipeline is detected by the flow detection component 7, when the operating parameter of the water pump 5 is a known fixed value, the combustion load required by the current burner can be determined according to the above second preset relationship, so that the combustion load of the burner automatically matches the current water temperature and flow conditions. In particular, when the user uses water midway during the internal circulation process, the above combustion load and water temperature and flow matching setting can achieve rapid increase of the water temperature in the heat exchanger 2 and the connecting pipeline while reasonably controlling the water temperature to prevent a large temperature jump or even an over-temperature problem.

[0093] In addition, the gas water heater may also include a third temperature detection component 63 for obtaining the outlet water temperature of the heat exchanger 2, and the third temperature detection component 63 is arranged on the water outlet pipe 42 between the connecting part of the parallel pipe 43 and the water outlet pipe 42 to the water outlet 22 of the heat exchanger 2.

[0094] In this embodiment, the gas water heater may also be provided with a third temperature detection component 63 for obtaining the outlet water temperature of the heat exchanger 2. The third temperature detection component 63 may be electrically connected to the controller. The controller may determine whether the gas water heater is currently at an over-temperature risk based on the outlet water temperature of the heat exchanger 2 obtained by the third temperature detection component 63. When the temperature detected by the third temperature detection component 63 reaches the over-temperature temperature, the controller may control the burner to stop burning to prevent accidents that scald the user. The over-temperature temperature may be a temperature value stored in the controller, for example, it may be a temperature of 55 degrees Celsius or about 55 degrees Celsius. Specifically, the temperature value may be adaptively adjusted according to actual conditions, and the application does not make a unique numerical limit here.

[0095] In the second embodiment, in the water flow direction, the water storage tank 3 is located downstream of the heat exchanger 2, and the first temperature detection component 61 is arranged on the water outlet pipe 42 between the outlet of the water storage tank 3 and the connecting part between the parallel pipe 43 and the water outlet pipe 42.

[0096] In this embodiment, the main difference from the above embodiment is that the water tank 3 is located downstream of the heat exchanger 2. Accordingly, the first temperature detection component 61 can be arranged on the water outlet pipeline 42 between the outlet of the water tank 3 and the second connecting portion F, so as to facilitate the instant detection of the water temperature flowing out of the water tank 3.

[0097] Furthermore, the second temperature detection component 62 is disposed on the water outlet pipeline 42 between the water outlet 22 of the heat exchanger 2 and the inlet of the water storage tank 3 , so as to facilitate instant detection of the temperature of water flowing into the water storage tank 3 .

[0098] In addition, in this embodiment, the gas water heater may further include a third temperature detection component 63 for obtaining the water inlet temperature of the heat exchanger 2, and the third temperature detection component 63 is arranged on the water inlet pipeline 41 between the parallel pipeline 43 and the connecting part of the water inlet pipeline 41 to the water inlet 21 of the heat exchanger 2. That is, the third temperature detection component 63 may be arranged on the water inlet pipeline 41 between the first connecting part E and the water inlet 21 of the heat exchanger 2, and is used to obtain the water inlet temperature on the water inlet pipeline 41. The subsequent controller may control the load of the burner according to the water inlet temperature detected by the third temperature detection component 63. For example, when the water in the water tank 3 of the gas water heater has a high temperature, the preheating function of the gas water heater is started. Since the water tank 3 has a high temperature, the temperature detected by the first temperature detection component 61 will be higher than the temperature of the third temperature detection component 63. At this time, if the water temperature detected by the first temperature detection component 61 is used as the water inlet temperature of the burner, there may be a certain error (the water inlet temperature is too high), resulting in the combustion load of the burner not matching the current required heat. If the water temperature detected by the third temperature detection component 63 is used as the water inlet temperature of the burner, the current water temperature entering the burner can be accurately obtained, thereby accurately controlling the combustion load of the burner to match it with the current required heat.

[0099] In some embodiments, 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, and the water pump 5 can drive the connecting pipeline and the water in the water flow channel of the heat exchanger 2 to circulate internally; when the gas water heater is in the normal water use mode, the control valve 8 is in a second state, and water enters the gas water heater from the water inlet pipeline 41 and passes through the water storage tank 3 and the heat exchanger 2 or passes through the heat exchanger 2 and the water storage tank 3 and then flows out of the gas water heater from the water outlet pipeline 42.

[0100] 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 water 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 water pump 5 can at least allow water to enter the gas water heater from the water inlet pipeline 41 and flow out of the gas water heater through the water storage tank 3 and the heat exchanger 2 or after passing through the heat exchanger 2 and the water storage tank 3 from the water outlet pipeline 42 to be supplied to the user terminal.

[0101] Specifically, the control valve 8 may include any one of the following: a switch valve or an electric water valve arranged on the parallel pipeline 43; a three-way valve arranged at the connecting portion between the water outlet pipeline 42 and the parallel pipeline 43; a three-way valve arranged at the connecting portion between the water inlet pipeline 41 and the parallel pipeline 43.

[0102] For example, when the control valve 8 is a switch valve provided on the parallel pipe 43, when the water in the inner circulation water circuit needs to circulate, the switch valve is in a closed state so that the water in the parallel pipe 43 can flow. When water needs to flow out of the water outlet pipe 42 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 parallel pipe 43 does not flow.

[0103] 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 parallel pipe 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 parallel pipe 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 water circuit is circulated, the electric water valve has a first opening so that the water in the parallel pipe 43 is circulated. When water is used to flow out of the gas water heater from the water outlet pipe 42, the electric water valve has a second opening smaller than the first opening so that the water in the parallel pipe 43 does not circulate, or so that the water entering the gas water heater from the water inlet pipe 41 partially flows into the parallel pipe 43 and partially flows into the water storage tank 3.

[0104] For example, when the control valve 8 is a three-way valve, specifically, the three-way valve can be arranged at the connection between the water outlet pipe 42 and the parallel pipe 43 (i.e., the second connecting part F). When the water in the internal circulation water circuit needs to be circulated, the three-way valve connects the water outlet pipe 42 with the parallel pipe 43.

[0105] Alternatively, the three-way valve can be set at the connection between the water inlet pipeline 41 and the parallel pipeline 43 (i.e., the first connecting part E). When the water in the internal circulation water circuit needs to circulate, the three-way valve connects the parallel pipeline 43 with the water inlet pipeline 41.

[0106] 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.

[0107] The present application forms the above-mentioned internal circulation water circuit and the above-mentioned controller, control valve 8, temperature detection component and flow detection component 7. During the entire working process of the burner, it can adaptively control the combustion load according to the actual heat required in the internal circulation water circuit, the temperature of the current key heating object and the flow parameters in the internal circulation water circuit, thereby realizing the rapid preheating function and improving the user's constant temperature experience during subsequent use.

[0108] Since the water storage tank 3 is provided in the internal circulation water circuit in the present application as a water storage container and a water mixing container, when the user uses water, the water storage function of the water storage tank 3 can be utilized to provide the user with water with suitable temperature at the first time, and the water mixing function of the water storage tank 3 can be utilized to mix the water with higher temperature heated by the heat exchanger 2 and the water with lower temperature supplied from the outside, thereby ensuring that the water flowing out to the user is always water with constant temperature.

[0109] 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.

[0110] 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.

[0111] 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: include: case; A heat exchanger, the heat exchanger having a water inlet and a water outlet; a burner for supplying heat energy to the heat exchanger; a water inlet pipeline connected to the water inlet of the heat exchanger; a water outlet pipeline connected to the water outlet of the heat exchanger; A parallel pipeline connected to the water inlet pipeline and the water outlet pipeline and arranged in parallel with the water flow channel in the heat exchanger; A water storage tank, the water storage tank is arranged on the water inlet pipeline between the connecting portion of the parallel pipeline and the water inlet pipeline and the water inlet of the heat exchanger or on the water outlet pipeline between the connecting portion of the parallel pipeline and the water outlet pipeline and the water outlet of the heat exchanger; The parallel pipeline, the water inlet pipeline provided between the communicating portion between the parallel pipeline and the water inlet pipeline and the water inlet of the heat exchanger, and the water outlet pipeline provided between the communicating portion between the parallel pipeline and the water outlet pipeline and the water outlet of the heat exchanger form a communicating pipeline connecting the water inlet of the heat exchanger with the water outlet of the heat exchanger; a water pump is provided on the communicating pipeline, and the water pump is used to drive the water in the communicating pipeline and the water flow channel of the heat exchanger to circulate internally; A flow detection component, the flow detection component is arranged on the water inlet pipeline between the connecting portion of the parallel pipeline and the water inlet pipeline and the water inlet of the heat exchanger or on the water outlet pipeline between the connecting portion of the parallel pipeline and the water outlet pipeline and the water outlet of the heat exchanger; A first temperature detection component is used to detect the outlet water temperature of the water storage tank.

2. The gas water heater according to claim 1, characterized in that: The gas water heater further comprises: a second temperature detection component for detecting the water inlet temperature of the water storage tank.

3. The gas water heater according to claim 2, characterized in that: In the water flow direction, the water storage tank is located upstream of the heat exchanger, and the first temperature detection component is arranged on the water inlet pipeline between the outlet of the water storage tank and the water inlet of the heat exchanger.

4. The gas water heater according to claim 3, characterized in that: The second temperature detection component is disposed on the water inlet pipeline between the parallel pipeline and the connecting portion of the water inlet pipeline to the inlet of the water storage tank.

5. The gas water heater according to claim 3, characterized in that: The gas water heater also includes a third temperature detection component for obtaining the outlet water temperature of the heat exchanger, and the third temperature detection component is arranged on the outlet water pipeline between the connecting part of the parallel pipeline and the outlet water pipeline to the water outlet of the heat exchanger.

6. The gas water heater according to claim 2, characterized in that: In the water flow direction, the water storage tank is located downstream of the heat exchanger, and the first temperature detection component is arranged on the water outlet pipeline between the outlet of the water storage tank and the connecting part of the parallel pipeline and the water outlet pipeline.

7. The gas water heater according to claim 6, characterized in that: The second temperature detection component is disposed on the water outlet pipeline between the water outlet of the heat exchanger and the inlet of the water storage tank.

8. The gas water heater according to claim 6, characterized in that: The gas water heater also includes a third temperature detection component for obtaining the water inlet temperature of the heat exchanger, and the third temperature detection component is arranged on the water inlet pipeline between the connecting part of the parallel pipeline and the water inlet pipeline to the water inlet of the heat exchanger.

9. The gas water heater according to claim 3, characterized in that: The water storage tank also includes a heat exchange component, the interior of the heat exchange component is used for flue gas to circulate, and the flue gas entering the heat exchange component can exchange heat with the water contained in the water storage tank through the heat exchange component.

10. The gas water heater according to claim 9, characterized in that: Along the flow direction of the flue gas, the heat exchange component is arranged downstream of the heat exchanger, and the flue gas generated by the burner exchanges heat with the heat exchanger and then flows into the heat exchange component.

11. The gas water heater according to claim 10, characterized in that: The heat exchange component comprises a heat exchange tube, and the heat exchange tube of the heat exchange component is inserted into the water storage tank.

12. The gas water heater according to claim 10, characterized in that: The heat exchanger, the water storage tank, and the heat exchange component are all made of stainless steel.

13. The gas water heater according to claim 3 or 6, characterized in that: The gas water heater further comprises a control valve, and the gas water heater comprises 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 the first state, and the water pump can drive the water in the connecting pipe and the water flow channel of the heat exchanger to circulate internally; When the gas water heater is in normal water use mode, the control valve is in the second state, water enters the gas water heater from the water inlet pipe and flows out of the gas water heater from the water outlet pipe after passing through the water storage tank and the heat exchanger or after passing through the heat exchanger and the water storage tank.

14. The gas water heater according to claim 13, characterized in that: The control valve includes any one of the following: A switch valve or an electric water valve arranged on the parallel pipeline; A three-way valve disposed at the connecting portion between the water outlet pipeline and the parallel pipeline; A three-way valve is arranged at the connecting portion between the water inlet pipeline and the parallel pipeline.

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