Water heating system and water heating device

Abstract

The invention provides a hot water system and a water heating device. The hot water system comprises a first water heating device and a second water heating device. The first water heating device comprises a first inner container, and a phase change material is arranged in the first inner container; the first inner container is provided with a heating part for heating the phase change material; a first heat exchanger is arranged in the first inner container, and water flowing through the first heat exchanger can exchange heat with the phase change material; the second water heating device can preheat water input into the first water heating device, and at least part of the preheated water flows into the first heat exchanger or at least part of the preheated water preheated in a preset state flows into the first heat exchanger. The first water heating device heats the preheated water and then conveys the preheated water to a water using point. Water input into the first water heating device is preheated, so that the heating time required for outputting hot water is shortened, and the use requirements of a user for large hot water consumption and large-flow water consumption are met.

Description

Technical Field

[0001] The present application relates to the technical field of water heating equipment, and in particular to a hot water system and a water heating device. Background Art

[0002] This section is intended to provide a background or context to the embodiments of the present application as recited in the claims. No admission is made that the description herein is prior art by inclusion in this section.

[0003] For large-area houses such as flats or villas, users usually set up multiple toilets or a large number of water-using equipment in the house, resulting in an increasing demand for hot water by users. At present, the water heating devices installed in users' houses are usually separate gas water heaters or electric water heaters. Among them, there is water resistance in the process of gas water heaters heating water to output hot water, and it is impossible to provide a large flow of hot water output. Under the condition of large flow of water use, simple gas water heaters also have problems such as insufficient heat load, high noise and poor working conditions. Electric water heaters can provide a large flow of hot water output, but the capacity is small and cannot meet the user's large hot water consumption needs. Electric water heaters that can meet the needs of large hot water consumption require a capacity of 200L to 300L. The overall size of this electric water heater is huge, and it takes up a very large installation space, which cannot be installed in ordinary bathrooms. Some users may set up multiple water heating devices, such as gas water heaters and electric water heaters, but multiple water heaters usually provide hot water independently, and multiple water heaters are not interconnected, and it is impossible to combine the advantages and energy of multiple water heaters to provide users with continuous large flow of hot water. Therefore, the current single water heating device is difficult to meet the user's needs for large flow and large hot water consumption. Summary of the invention

[0004] One object of the present application is to provide a hot water system, which reduces the heating time required for the first water heating device to heat the output hot water by preheating the water input into the first water heating device, thereby meeting the user's demand for large hot water consumption and large flow of water. Another object of the present application is to provide a water heating device.

[0005] In order to achieve the above objectives, the present application discloses a hot water system, comprising:

[0006] a first water heating device and a second water heating device;

[0007] The first water heating device comprises a first inner tank, in which a phase change material is arranged;

[0008] The first liner is provided with a heating component for heating the phase change material;

[0009] A first heat exchanger is disposed in the first inner tank, and water flowing through the first heat exchanger can perform heat exchange with the phase change material;

[0010] The second water heating device can preheat the water input into the first water heating device, and the preheated water at least partially flows into the first heat exchanger or the preheated water at least partially flows into the first heat exchanger under a predetermined state;

[0011] The first water heating device heats the preheated water and then supplies it to the water use point.

[0012] Optionally, the heating component includes an electric heating element disposed on the first inner pot and extending into the phase change material, or a heating tube disposed in the first inner pot or on the outer wall of the first inner pot and through which a heating medium flows.

[0013] Optionally, the heating tube is a circular tube, an elliptical tube or a microchannel tube, and the heating medium is hot water supplied by a gas water heater or an electric water heater or a heating refrigerant supplied by a heat pump device.

[0014] Optionally, the second water heating device is connected to a water supply pipeline, and water flowing into the second water heating device from the water supply pipeline is preheated by the second water heating device and then input into the first water heating device.

[0015] Optionally, a second heat exchanger is also included, which includes a first flow channel and a second flow channel. The liquid flowing into the first flow channel and the liquid flowing into the second flow channel can exchange heat. The first flow channel is used to circulate the heating medium heated by the second water heating device, and the tap water in the water supply pipeline input into the second flow channel is preheated by the heating medium and then input into the first water heating device.

[0016] Optionally, the second water heating device is a gas water heater or an electric water heater.

[0017] Optionally, the heating medium includes water or a refrigerant.

[0018] Optionally, the second water heating device is a gas water heater, an electric water heater or a heat pump water heater.

[0019] Optionally, the first water heating device further includes a second inner tank;

[0020] The first inner tank comprises a first water inlet and a first water outlet;

[0021] The second inner tank comprises a second water inlet and a second water outlet;

[0022] The first water inlet and the first water outlet are in communication with the first heat exchanger, the first water inlet is used to input water into the first heat exchanger, and the first water outlet is used to output water heated by the first heat exchanger;

[0023] The second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner pot through the second water inlet; the second water outlet is used to output the water heated again by the second inner pot;

[0024] At least part of the preheated water flows into the first water inlet.

[0025] Optionally, the first water heating device also includes a constant temperature element, which includes a first inlet, a second inlet and an outlet, the first inlet is connected to the second outlet, the second inlet is used to input part of the preheated water or tap water, and the outlet is used to output the mixed water that flows into the constant temperature element from the first inlet and the second inlet.

[0026] Optionally, the first water heating device further comprises a diverter element, and the diverter element is used to divert the preheated water flowing into the first water heating device to the first water inlet and the second inlet.

[0027] Optionally, the flow diversion element includes a three-way connector or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves.

[0028] Optionally, the first water heating device further includes a second inner tank;

[0029] The first inner tank comprises a first water inlet and a first water outlet;

[0030] The second inner tank comprises a second water inlet and a second water outlet;

[0031] The first water inlet and the first water outlet are in communication with the first heat exchanger;

[0032] The first inner pot and the second inner pot are arranged in parallel, and the preheated water flowing into the first water heating device can flow into the first inner pot and the second inner pot through the first water inlet and the second water inlet respectively; the preheated water flowing into the first inner pot flows out from the first water outlet after being heated, and the preheated water flowing into the second inner pot flows out from the second water outlet after being heated;

[0033] In a predetermined state, at least a portion of the preheated water flows into the first water inlet.

[0034] Optionally, the first water heating device further comprises a diverter element, and the diverter element is used to divert the preheated water flowing into the first water heating device to the first water inlet and / or the second water inlet.

[0035] Optionally, the first water heating device also includes a constant temperature element, which includes a first inlet, a second inlet and an output port, the first inlet is used to input the heated water flowing out from the first water outlet and / or the second water outlet, the second inlet is used to input the part of the preheated water or tap water, and the output port is used to output the mixed water after flowing into the constant temperature element from the first inlet and the second inlet.

[0036] Optionally, the preheated water input into the second inlet is diverted through the diverter element.

[0037] Optionally, the flow diverting element includes a three-way joint or a four-way joint or a three-way flow distribution valve or a four-way flow distribution valve or at least two flow regulating valves or at least two solenoid valves.

[0038] Optional,

[0039] The second inner container further comprises a heating element for heating the water stored in the second inner container.

[0040] Optionally, it also includes a flow control device and a bypass pipeline arranged in parallel with the second water heating device, the flow control device is used to supply tap water in the water supply pipeline to the second water heating device or the bypass pipeline, and the water flowing out of the bypass pipeline flows to the first water heating device.

[0041] Optionally, the flow control device is arranged on the bypass pipeline, and the flow control device is a solenoid valve.

[0042] Optionally, further comprising a thermostatic element;

[0043] The thermostatic element includes a first inlet, a second inlet and an output port, the first inlet is used to input the preheated water heated by the first water heating device, the second inlet is used to input part of the preheated water or tap water, and the output port is used to output the mixed water that flows into the thermostatic element from the first inlet and the second inlet to the water use point.

[0044] Optionally, the thermostatic element is integrated on the first water heating device.

[0045] Optionally, further comprising a soft water module;

[0046] The soft water module is used to soften the water input into the first water heating device.

[0047] Optional,

[0048] The soft water module is disposed upstream or downstream of the second water heating device, and is used to soften water flowing into or out of the second water heating device.

[0049] The present application also discloses a water heating device, comprising:

[0050] Water inlet and outlet;

[0051] a first liner, wherein a phase change material is disposed in the first liner;

[0052] The first liner is provided with a heating component for heating the phase change material;

[0053] A first heat exchanger is disposed in the first inner tank, and water flowing through the first heat exchanger can perform heat exchange with the phase change material;

[0054] The water inlet is used to input preheated water heated by the heating device;

[0055] At least part of the preheated water input into the water inlet flows into the first heat exchanger or at least part of the preheated water input into the water inlet flows into the first heat exchanger under a predetermined state;

[0056] The water outlet is used to output the preheated water heated by the water heating device;

[0057] Optionally, the heating component includes an electric heating element disposed on the first inner pot and extending into the phase change material, or a heating tube disposed in the first inner pot or on the outer wall of the first inner pot and through which a heating medium flows.

[0058] Optionally, the heating tube is a circular tube, an elliptical tube or a microchannel tube, and the heating medium is hot water supplied by a gas water heater or an electric water heater or a heating refrigerant supplied by a heat pump device.

[0059] Optionally, a second liner is also included;

[0060] The first inner tank comprises a first water inlet and a first water outlet;

[0061] The second inner tank comprises a second water inlet and a second water outlet;

[0062] The first water inlet of the first inner container is connected to the water inlet portion, and the second water outlet of the second inner container is connected to the water outlet portion;

[0063] The first water inlet and the first water outlet are in communication with the first heat exchanger, the first water inlet is used to input water into the first heat exchanger, and the first water outlet is used to output water heated by the first heat exchanger;

[0064] The second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner pot through the second water inlet; the second water outlet is used to output the water heated again by the second inner pot;

[0065] The first water inlet is used to receive at least part of the preheated water.

[0066] Optionally, a constant temperature element is also included, which includes a first inlet, a second inlet and an outlet, the first inlet is connected to the second outlet, the second inlet is used to input part of the preheated water or tap water, and the outlet is used to output the mixed water that flows into the constant temperature element from the first inlet and the second inlet.

[0067] Optionally, a diverter element is further included, and the diverter element is used to divert the inflowing preheated water to the first water inlet and the second inlet.

[0068] Optionally, the flow diversion element includes a three-way connector or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves.

[0069] Optionally, a second liner is also included;

[0070] The first inner tank comprises a first water inlet and a first water outlet;

[0071] The second inner tank comprises a second water inlet and a second water outlet;

[0072] The first water inlet and the second water inlet are respectively connected to the water inlet portion, and the first water outlet and the second water outlet are respectively connected to the water outlet portion;

[0073] The first water inlet and the first water outlet are in communication with the first heat exchanger;

[0074] The first inner pot and the second inner pot are arranged in parallel, and the preheated water flowing into the first water heating device can flow into the first inner pot and the second inner pot through the first water inlet and the second water inlet respectively; the preheated water flowing into the first inner pot flows out from the first water outlet after being heated, and the preheated water flowing into the second inner pot flows out from the second water outlet after being heated;

[0075] The first water inlet is used to receive at least part of the preheated water in a predetermined state.

[0076] Optionally, a diverter element is further included, and the diverter element is used to divert the preheated water flowing into the first water heating device to the first water inlet and / or the second water inlet.

[0077] Optionally, a thermostatic element is further included, which includes a first inlet, a second inlet and an output port, wherein the first inlet is used to input heated water flowing out from the first water outlet and / or the second water outlet, the second inlet is used to input part of the preheated water or tap water, and the output port is used to output mixed water that flows into the thermostatic element from the first inlet and the second inlet.

[0078] Optionally, the second inlet is connected to the diverter element.

[0079] Optionally, the flow diverting element includes a three-way joint or a four-way joint or a three-way flow distribution valve or a four-way flow distribution valve or at least two flow regulating valves or at least two solenoid valves.

[0080] Optional,

[0081] The second inner container includes a heating element for heating the water stored in the second inner container.

[0082] Optionally, the water heating device further comprises a thermostatic element;

[0083] The thermostatic element includes a first inlet, a second inlet and an output port, the first inlet is used to input the preheated water heated by the first water heating device, the second inlet is used to input part of the preheated water or tap water, and the output port is used to output the water mixed after flowing into the thermostatic element from the first inlet and the second inlet.

[0084] The first inner tank of the first water heating device of the present application is provided with a phase change material, and the phase change material can be heated by the heating component in the first inner tank. The heated phase change material can exchange heat with the water flowing through the first heat exchanger to heat the water flowing through the first heat exchanger. In addition, the present application preheats the water input to the first water heating device through the second water heating device, and at least part of the preheated water flows into the first water heating device after preheating, so that the first water heating device can heat the preheated water and then deliver it to the water use point. In this process, the water input to the first water heating device is preheated by the second water heating device, so that the temperature of the water input to the first water heating device is increased. The energy required by the first water heating device to heat the preheated water to obtain hot water to be delivered to the water use point is less than the energy required to heat the non-preheated water to obtain hot water of the same temperature, and the efficiency of the first water heating device outputting hot water becomes higher, thereby increasing the amount of hot water delivered to the water use point by the first water heating device. The second water heating device and the first water heating device jointly provide energy for the process of heating to obtain hot water, and then output it to the water use point through the first water heating device, thereby improving the ability of the first water heating device to continuously output hot water and meeting the user's large water consumption demand for hot water. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without creative work. In the drawings:

[0086] Figure 1 A schematic diagram showing the structure of a hot water system according to a first embodiment of the present application is shown;

[0087] Figure 2 A structural schematic diagram showing a second embodiment of the hot water system of the present application is shown;

[0088] Figure 3 A schematic diagram showing the structure of a third embodiment of a hot water system of the present application is shown;

[0089] Figure 4 A structural schematic diagram of a fourth embodiment of the hot water system of the present application is shown.

[0090] Reference numerals:

[0091] 1. First water heating device; 11. First inner tank; 111. First heat exchanger; 12. Second inner tank; 2. Second water heating device; 3. Water supply pipeline; 4. Constant temperature element; 41. First inlet; 42. Second inlet; 43. Output port; 5. Water pipeline; 51. Water point; 6. Booster pump; 71. First solenoid valve; 72. Second solenoid valve; 73. Third solenoid valve; 74. Circulation valve; 75. Fourth solenoid valve; 76. Fifth solenoid valve; 77. Sixth solenoid valve. DETAILED DESCRIPTION

[0092] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0093] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not used to limit a specific order or sequence. It should be understood that the distinguishing descriptions of these objects can be interchanged where appropriate. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0094] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0095] Positional relationships such as “parallel” or “perpendicular” include not only completely “parallel” or “perpendicular” positional relationships, but also positional relationships whose angle deviations relative to completely “parallel” or “perpendicular” are within a preset deviation range.

[0096] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0097] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0098] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0099] In the prior art, when there are many water-using devices in the user's room, the user's demand for hot water will increase dramatically. Specifically, when the indoor area is large, more water-using devices may be set up, including but not limited to shower equipment and faucets. For example, the user's room may include multiple toilets, each of which needs to be equipped with water-using devices such as shower equipment and faucets that can provide hot water. Therefore, the user's hot water consumption may be at a high level. However, the one or more water heaters currently installed in the user's room are usually independently set, and the water heaters include but are not limited to gas water heaters and electric water heaters. Among them, the gas water heater heats the input tap water in real time to obtain hot water and then outputs it. However, the water resistance of the gas water heater during the heating process is large, and it is impossible to achieve a large flow of hot water output. The electric water heater is usually a storage water heater, which includes an inner tank. The electric water heater can heat the water stored in the inner tank to obtain hot water of a preset temperature and then stop heating. The electric water heater is not limited by water resistance and can provide a large flow of hot water. However, the amount of hot water that the electric water heater can provide is limited by the capacity of the inner tank, and it cannot continuously provide a large flow of hot water. The amount of hot water that can be provided in a short time is limited by the capacity of the inner tank of the electric water heater. After the hot water in the inner tank is basically used up, the real-time heating of the electric water heater still cannot meet the user's continuous and large demand for hot water. Therefore, the existing independently set water heater has limited ability to provide hot water. The first inner tank of the first water heating device of the present application is provided with a phase change material, which can be heated by the heating component in the first inner tank. The heated phase change material can exchange heat with the water flowing through the first heat exchanger to heat the water flowing through the first heat exchanger. In addition, the present application preheats the water input to the first water heating device through the second water heating device, and at least part of the preheated water flows into the first water heating device, so that the first water heating device can heat the preheated water and then transmit it to the water point. During this process, water input into the first water heating device is preheated by the second water heating device, so that the temperature of the water input into the first water heating device is increased. The energy required by the first water heating device to heat the preheated water to obtain hot water for delivery to the water use point is less than the energy required to heat the non-preheated water to obtain hot water of the same temperature. The efficiency of the first water heating device in outputting hot water is improved, thereby increasing the amount of hot water delivered to the water use point by the first water heating device and meeting the user's large water consumption demand for hot water.

[0100] like Figure 1 to Figure 4 The schematic diagram of a specific embodiment of the hot water system of the present application is shown. The hot water system provided by the embodiment of the present application comprises a first water heating device 1 and a second water heating device 2 .

[0101] The first water heating device 1 comprises a first inner tank 11 in which a phase change material is arranged; the first inner tank 11 is provided with a heating component for heating the phase change material.

[0102] The first inner tank 11 is provided with a first heat exchanger 111 , and water flowing through the first heat exchanger 111 can perform heat exchange with the phase change material.

[0103] The second water heating device 2 can preheat the water input into the first water heating device 1, and the preheated water at least partially flows into the first heat exchanger 111 or the preheated water at least partially flows into the first heat exchanger 111 under a predetermined state; the first water heating device 1 heats the preheated water and then outputs it to the water use point 51.

[0104] Therefore, the first inner tank 11 of the first water heating device 1 of the present application is provided with a phase change material, and the phase change material can be heated by the heating component in the first inner tank 11, and the heated phase change material can exchange heat with the water flowing through the first heat exchanger 111, thereby heating the water flowing through the first heat exchanger 111. In addition, the present application preheats the water input to the first water heating device 1 through the second water heating device 2, and at least part of the preheated water flows into the first water heating device 1, so that the first water heating device 1 can heat the preheated water and then transmit it to the water use point 51. During this process, water input to the first water heating device 1 is preheated by the second water heating device 2, so that the temperature of the preheated water input to the first water heating device 1 is increased. The energy required by the first water heating device 1 to heat the preheated water to obtain hot water for delivery to the water use point 51 is less than the energy required to heat non-preheated water to obtain hot water of the same temperature. The efficiency of the first water heating device 1 in outputting hot water is improved, thereby increasing the amount of hot water delivered to the water use point 51 by the first water heating device 1. The second water heating device 2 and the first water heating device 1 jointly provide energy for the process of heating to obtain hot water, and then output it to the water use point through the first water heating device 1, thereby improving the ability of the first water heating device 1 to continuously output hot water and meeting the user's large water consumption demand for hot water.

[0105] In the present application, the second water heating device 2 can preheat the water input into the first water heating device 1. It should be noted that the second water heating device 2 of the present application preheats the water input into the first water heating device 1, which may include an implementation method in which the water entering the first water heating device 1 first passes through the second water heating device 2 so that the second water heating device 2 preheats it before inputting it into the first water heating device 1, and also includes an implementation method in which the heating medium output by the second water heating device 2 and heated by the second water heating device 2 preheats the water input into the first water heating device 1 through heat exchange.

[0106] Specifically, in some embodiments, the heating component may include an electric heating element disposed on the first inner tank 11 and extending into the phase change material, and the electric heating element may heat the phase change material after being energized, and the heated phase change material may perform heat exchange with water flowing through the first heat exchanger 111, thereby heating the water flowing through the first heat exchanger 111. The water input into the first heat exchanger 111 of the first water heating device 1 is water preheated by the second water heating device 2.

[0107] The electric heating element may be a heating rod or other element, and the heating rod may heat the phase change material after being energized. Of course, in practical applications, the electric heating element may also be other elements, and this application does not limit this.

[0108] In other embodiments, the heating component may also include a heating tube disposed in the first inner liner 11 or on the outer wall of the first inner liner 11 for the circulation of a heating medium. The heating tube may be disposed in the first inner liner 11, and the heating tube disposed in the first inner liner 11 may directly contact the phase change material to heat the phase change material, resulting in a better heating effect. Of course, the heating tube disposed in the first inner liner 11 may not directly contact the phase change material, so that the heating medium in the heating tube can heat the phase change material. The heating tube may also be disposed on the outer wall of the first inner liner 11, and the heating medium in the heating tube transfers heat energy to the phase change material in the first inner liner 11 through the heating tube and the first inner liner 11 to heat the phase change material.

[0109] It should be noted that the heating tube can be made of round tubes, elliptical tubes or microchannel tubes. Of course, in practical applications, technical personnel in this field can also choose other available tubes or tube combinations to form a heating tube according to actual needs, and this application does not limit this.

[0110] It should be noted that the heating medium can be hot water supplied by a gas water heater or an electric water heater, or a heating refrigerant supplied by a heat pump. It should be noted that the gas water heater can be a gas water heater or other available gas water heater, and the electric water heater can be an electric water heater or other available electric water heater, and this application does not limit this.

[0111] Wherein, when the second water heating device 2 is a gas water heater or an electric water heater, the hot water output by the second water heating device 2 heats the water input to the first water heating device 1, so that the second water heating device 2 preheats the water input to the first water heating device 1. The second water heating device 2 can also be a heat pump device, and the heating refrigerant output by the second water heating device 2 can heat the water input to the first water heating device 1 by heat exchange, so that the second water heating device 2 preheats the water input to the first water heating device 1.

[0112] In some embodiments, the second water heating device 2 may be connected to the water supply pipeline 3 , and the water output from the water supply pipeline 3 for input into the first water heating device 1 is first preheated by the second water heating device 2 and then input into the first water heating device 1 .

[0113] Among them, when the second water heating device 2 is a gas water heater or an electric water heater, the second water heating device 2 preheats the water output by the water pipeline 3 and then inputs it into the first water heating device 1, thereby achieving the purpose of the second water heating device 2 preheating the water input into the first water heating device 1.

[0114] Among them, it should be noted that, in an optional embodiment, when the water input into the first water heating device 1 is first input into the second water heating device 2 for preheating, considering that when the second water heating device 2 adopts a gas water heater, there is water resistance which will affect the flow rate of hot water output by the first water heating device 1, a booster pump 6 can be set on the water supply pipeline 3 for water transmission to boost the water input into the second water heating device 2 for preheating, so as to overcome the influence of the water resistance of the second water heating device 2 and ensure the flow rate of hot water output by the first water heating device 1.

[0115] In some embodiments, the hot water system may further include a second heat exchanger. The second heat exchanger includes a first flow channel and a second flow channel. The liquid flowing into the first flow channel and the liquid flowing into the second flow channel can perform heat exchange. The first flow channel is used to circulate the heating medium heated by the second water heating device. The tap water in the water supply pipeline 3 input into the second flow channel is preheated by the heating medium and then input into the first water heating device 1. Among them, the second water heating device 2 can output the heated heating medium, and the heating medium circulates in the first flow channel of the second heat exchanger. The tap water output from the water supply pipeline 3 can circulate in the second flow channel of the second heat exchanger. The heating medium circulated in the first flow channel heats the tap water circulated in the second flow channel through the second heat exchanger and then input into the first water heating device 1, so as to achieve the purpose of the second water heating device 2 preheating the water input into the first water heating device 1. In this process, since the heating medium output by the second water heating device 2 is not directly input into the first water heating device 1, it is only used to preheat the water input into the first water heating device 1. Therefore, the water resistance of the second water heating device 2 will not affect the flow rate of hot water output by the first water heating device 1, and there is no need to additionally set up a boosting device such as a boosting pump 6 to overcome the influence of the water resistance.

[0116] Among them, the second water heating device 2 can be a gas water heater, an electric water heater or a heat pump water heater. The hot water or heating refrigerant output by the second water heating device 2 can heat the water input into the first water heating device 1 through the second heat exchanger, thereby achieving the purpose of the second water heating device 2 preheating the water input into the first water heating device 1. By setting the second heat exchanger, the selection range of the second water heating device 2 is expanded, and there is no need to consider the influence of the second water heating device 2 on the first water heating device 1.

[0117] It should be noted that the second water heating device 2 of the present application can preheat part of the water input to the first water heating device 1, or can preheat all the water input to the first water heating device, and the present application does not limit this.

[0118] Specifically, in some embodiments, when the first water heating device 1 includes not only the first inner tank 11 but also at least one other inner tank, the second water heating device 2 can preheat only the water of the first inner tank 11 input into the first water heating device 1, and can also preheat the water of the first inner tank 11 and at least one other inner tank input into the first water heating device 1.

[0119] The first inner container 11 and other inner containers may be arranged in series or in parallel.

[0120] When the first inner tank 11 is arranged in series with other inner tanks, the water entering the first water heating device 1 is heated by the first inner tank 11 and then flows into the next inner tank. Similarly, the next inner tank reheats the heated water flowing into the previous inner tank and then inputs it into the next inner tank until the last inner tank outputs the heated hot water to the water use point 51.

[0121] For example, in a specific embodiment, the first water heating device 1 further includes a second inner tank 12. The first inner tank 11 includes a first water inlet and a first water outlet; the second inner tank 12 includes a second water inlet and a second water outlet; the first water inlet and the first water outlet are connected to the first heat exchanger 111, the first water inlet is used to input water into the first heat exchanger 111, and the first water outlet is used to output water heated by the first heat exchanger 111; the second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner tank 12 through the second water inlet; the second water outlet is used to output water heated again by the second inner tank 12; the preheated water at least partially flows into the first water inlet.

[0122] The first water outlet of the first inner tank 11 is connected to the second water inlet of the second inner tank 12, and the water output from the first inner tank 11 after being heated by the first heat exchanger 111 is input into the second inner tank 12 through the second water inlet, so as to realize the series arrangement of the water paths of the first inner tank 11 and the second inner tank 12. At least part of the preheated water flows through the first inner tank 11 and the second inner tank 12 in sequence and then is output, and the first inner tank and / or the second inner tank heats the water flowing through.

[0123] When the first inner tank 11 is arranged in parallel with other inner tanks, the preheated water passing through the second water heating device 2 can flow into at least one of the multiple inner tanks. Thus, the first inner tank 11 and other inner tanks arranged in parallel can flow into the preheated water or the tap water of the water supply pipeline 3, and the tap water or preheated water flowing into each inner tank is heated and then output.

[0124] For example, in some embodiments, the first water heating device 1 further includes a second inner tank 12; the first inner tank 11 includes a first water inlet and a first water outlet; the second inner tank 12 includes a second water inlet and a second water outlet; the first water inlet and the first water outlet are connected to the first heat exchanger 111; the first inner tank 11 and the second inner tank 12 are arranged in parallel, and the preheated water flowing into the first water heating device 1 can flow into the first inner tank 11 and the second inner tank 12 through the first water inlet and the second water inlet respectively; the preheated water flowing into the first inner tank 11 flows out from the first water outlet after being heated, and the preheated water flowing into the second inner tank 12 flows out from the second water outlet after being heated; in a predetermined state, the preheated water at least partially flows into the first water inlet. Among them, the first water inlet and the second water inlet of the first inner tank 11 and the second inner tank 12 can be respectively input with preheated water, and the preheated water is heated by the first inner tank 11 and the second inner tank 12 and is respectively output through the first water outlet and the second water outlet of the first inner tank 11 and the second inner tank 12.

[0125] It should be noted that the first inner tank 11 and other inner tanks arranged in parallel can be respectively fed with preheated water or tap water from the water supply pipeline 3 through independent pipelines. Of course, at least part of the pipelines for feeding preheated water to multiple inner tanks can be combined into one pipeline, and the preheated water preheated by the second water heating device 2 is received through one pipeline, and then the preheated water can be diverted to different inner tanks by setting a diverting element on the pipeline. Thus, whether to input preheated water to each inner tank can be controlled by controlling the diverting state of the diverting element, wherein the diverting state of the diverting element can be switched to a predetermined state, so that at least part of the preheated water flows into the first water inlet so that the preheated water is fed into the first inner tank 11.

[0126] For example, in some embodiments, when the first water heating device 1 further includes a second inner tank 12, the first water heating device 1 may further include a diverter element, which is used to divert the preheated water flowing into the first water heating device 1 to the first water inlet and / or the second water inlet.

[0127] It should be noted that the first inner tank 11 and the second inner tank 12 can be respectively supplied with preheated water through separate pipelines, or a plurality of pipelines for supplying preheated water to the first inner tank 11 and the second inner tank 12 can be combined together through a diverter element, and the diverter element controls whether preheated water is supplied to the first inner tank 11 and the second inner tank 12.

[0128] Optionally, the diverter element includes a three-way connector or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves. Of course, in practical applications, those skilled in the art can also select other feasible diverter elements according to actual needs, and this application does not limit this.

[0129] It should be noted that the first water heating device 1 inputs preheated water, and can also be directly connected to the water supply pipeline 3 to receive tap water input from the water supply pipeline 3. Thus, the first inner tank 11 in the first water heating device 1 can only input preheated water preheated by the second water heating device 2, or can simultaneously input preheated water preheated by the second water heating device 2 and tap water input from the water supply pipeline 3. For example, when the first inner tank 11 includes a first water inlet and a first water outlet connected to the first heat exchanger 111, the first water inlet inputs the input water into the first heat exchanger 111 and heats it and then outputs it through the first water outlet. In some embodiments, the first water inlet of the first inner tank 11 can only be connected to the pipeline for inputting preheated water, and only preheated water is input to the first heat exchanger 111. In other embodiments, the first water inlet can also be connected to the water supply pipeline for inputting tap water and the pipeline for inputting preheated water at the same time to receive input preheated water and / or tap water.

[0130] Similarly, when the first water heating device 1 includes other inner tanks, the other inner tanks can be individually input with preheated water input through the second water heating device 2 for heating, or can be individually connected to the water supply pipe for inputting tap water and individually receive tap water for heating, or can be connected to the pipe for inputting preheated water and the water supply pipe for inputting tap water at the same time to receive preheated water and / or tap water.

[0131] It should be noted that when the first water heating device 1 includes multiple inner tanks, and multiple inner tanks are connected to a pipe for inputting preheated water or a water supply pipe for inputting tap water at the same time, the pipe for inputting preheated water or the water supply pipe for inputting tap water can be connected to the multiple inner tanks respectively through a diverter element, and the input of preheated water and / or tap water to each inner tank is controlled by the diverter element.

[0132] In an optional embodiment, in order to continuously provide users with constant temperature water with stable water temperature, a constant temperature element 4 may be further provided in the hot water system. The constant temperature element 4 includes a first inlet 41, a second inlet 42 and an outlet 43, and the outlet 43 is used to output the mixed water that flows into the constant temperature element 4 from the first inlet 41 and the second inlet 42.

[0133] Specifically, the first inlet 41 of the thermostatic element 4 is connected to the first water heating device 1, and the hot water output by the first water heating device 1 is input. The second inlet 42 of the thermostatic element 4 can be used to input part of the preheated water or tap water, and the output port 43 is used to output water mixed with the hot water output by the first water heating device 1 input from the first inlet 41 and the preheated water or tap water input from the second inlet 42.

[0134] It should be noted that a temperature detection module and a control module may also be provided in the hot water system, and the temperature detection module is used to detect the water temperature of the first inlet 41, the second inlet 42 and the output port 43 of the thermostatic element 4. Furthermore, the control module may control the opening of the first inlet 41 and the second inlet 42 according to the water temperature of the first inlet 41, the second inlet 42 and the output port 43 to control the amount of water input into the first inlet 41 and the second inlet 42, so that the water temperature of the mixed water output from the output port 43 of the thermostatic element 4 remains constant. Optionally, the temperature detection module may include a first temperature sensor for detecting the water temperature of the water input into the first inlet 41 of the thermostatic element 4, a second temperature sensor for detecting the water temperature of the water input into the second inlet 42 of the thermostatic element 4, and a third temperature sensor for detecting the water temperature of the water output from the output port 43 of the thermostatic element 4. The control module may optionally be implemented by a control chip. Of course, in practical applications, the temperature detection module and the control module may also be implemented in other ways, and the present application does not limit this.

[0135] In some embodiments, when the first water heating device 1 includes a first inner tank 11, the first inlet 41 of the thermostatic element 4 is connected to the water outlet of the first inner tank 11, and the first inlet 41 inputs the hot water outputted from the first inner tank 11 through the water outlet. In other embodiments, when the first water heating device 1 includes multiple inner tanks and the multiple inner tanks are connected in series in sequence, the first inlet 41 of the thermostatic element 4 is connected to the water outlet of the last inner tank connected in series, and the first inlet 41 inputs the hot water outputted from the last inner tank through the water outlet after being heated in sequence by multiple inner tanks. In still other embodiments, when the first water heating device 1 includes multiple inner tanks, and the multiple inner tanks are arranged in pure parallel or partially in parallel, the multiple inner tanks of the first water heating device 1 all output hot water, so that the first inlet 41 of the thermostatic element 4 is connected to the water outlet of the inner tank that outputs hot water in the first water heating device 1, and the first inlet 41 inputs the hot water outputted from the multiple inner tanks after being heated by one or more inner tanks.

[0136] It should be noted that the thermostatic element 4 can be integrated in the first water heating device 1 or be arranged outside the first water heating device 1. In practical applications, technicians in this field can set the position of the thermostatic element 4 according to actual conditions, and this application does not limit this.

[0137] In an optional embodiment, the hot water system also includes a flow control device and a bypass pipeline arranged in parallel with the second water heating device 2, the flow control device is used to supply the tap water in the water supply pipeline 3 to the second water heating device 2 or the bypass pipeline, and the water flowing out of the bypass pipeline flows to the first water heating device 1.

[0138] It is understandable that the second water heating device 2 can preheat the water input into the first water heating device 1. In some embodiments, the tap water in the water supply pipeline 3 for input into the first water heating device 1 needs to be input into the second water heating device 2 first and then preheated by the second water heating device 2 before being input into the first water heating device 1, so that the second water heating device 2 can preheat the water input into the first water heating device 1. In some scenarios, the user's hot water consumption may not be large. At this time, the second water heating device 2 preheats the water input into the first water heating device 1. On the one hand, when the second water heating device 2 preheats the water, there may be water resistance in the second water heating device 2, which affects the flow rate of the hot water output by the first water heating device 1. On the other hand, it may also lead to problems such as the life of the second water heating device 2 and energy waste.

[0139] Therefore, in this optional embodiment, a parallel bypass pipeline can be set for the second water heating device 2, and the flow control device is used to control the tap water in the water supply pipeline 3 to flow to the second water heating device 2 or the bypass pipeline. When the flow control device controls the tap water in the water supply pipeline 3 to flow to the second water heating device 2, the second water heating device 2 preheats the input tap water before inputting it into the first water heating device 1, which is suitable for scenes with a large amount of hot water consumption. When the flow control device controls the tap water in the water supply pipeline 3 to flow to the bypass pipeline, the tap water in the water supply pipeline 3 can flow to the first water heating device 1 through the bypass pipeline, and hot water is provided only through the first water heating device 1, which is suitable for scenes with a small amount of hot water consumption.

[0140] Optionally, the flow control device is arranged on the bypass pipeline, and the flow control device is a solenoid valve. Specifically, the flow control device can be arranged on the bypass pipeline, and the conduction or closing of the bypass pipeline is controlled by the flow control device. When the flow control device controls the conduction of the bypass pipeline, the second water heating device 2 does not work, and the tap water input from the water supply pipeline 3 can be input into the first water heating device 1 through the bypass pipeline. When the flow control device controls the bypass pipeline to be closed, the second water heating device 2 can normally preheat the tap water input from the water supply pipeline 3 to the first water heating device 1 before inputting it into the first water heating device 1.

[0141] It should be noted that the flow control device can be a solenoid valve, which controls the on / off state of the solenoid valve through an electrical signal to control the on / off state of the bypass line. Of course, in other embodiments, the flow control device can also be other available flow control devices, which are not limited in this application.

[0142] In an optional embodiment, the hot water system may further include a softening module, which can soften the water input into the first water heating device 1 to prevent the first water heating device 1 from generating scale during the heating process, thereby improving water quality and reducing the service life of the first water heating device 1.

[0143] It can be understood that the second water heating device 2 can preheat the water input to the first water heating device 1, and the water input to the first water heating device 1 first enters the second water heating device 2, and the preheated water after being preheated by the second water heating device 2 is then input to the first water heating device 1. Therefore, the soft water module can be arranged upstream or downstream of the second water heating device 2 to soften the water input to the first water heating device 1.

[0144] The soft water module may be arranged upstream of the second water heating device 2. In some embodiments, the soft water module may be arranged on the water supply pipeline 3 for inputting tap water to the second water heating device 2, and the soft water module softens the tap water in the water supply pipeline 3, and the softened tap water is input to the second water heating device 2, and the preheated water preheated by the second water heating device 2 is further input to the first water heating device 1. In other embodiments, the soft water module may be integrated in the second water heating device 2, for example, it may be implemented by a fire-softened water heater that integrates heating and softening. In some embodiments, the soft water module may also be arranged downstream of the second water heating device 2. Specifically, the soft water module may be arranged on the pipeline for inputting preheated water from the second water heating device 2 to the first water heating device 1, and the preheated water output by the second water heating device 2 is softened before being input to the first water heating device 1.

[0145] It should be noted that the water supply pipeline 3 circulates tap water, and the second water heating device 2 preheats the water input to the first water heating device 1 to obtain preheated water, and the first water heating device 1 heats the preheated water and then supplies it to the water point 51. Therefore, in the present application, the water temperature of the water supplied to the water point 51 by the first water heating device 1 is greater than the water temperature of the preheated water, and the water temperature of the preheated water is greater than the water temperature of the tap water. Optionally, the water temperature of the tap water is usually less than 15°C, the water temperature of the preheated water is usually around 25°C, and the water temperature of the water supplied to the water point 51 is usually around 40°C.

[0146] In an optional embodiment, the first water heating device 1 further includes a second inner tank 12. The first inner tank 11 includes a first water inlet and a first water outlet; the second inner tank 12 includes a second water inlet and a second water outlet; the first water inlet and the first water outlet are connected to the first heat exchanger 111, the first water inlet is used to input water into the first heat exchanger 111, and the first water outlet is used to output water heated by the first heat exchanger 111; the second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner tank 12 through the second water inlet; the second water outlet is used to output water heated again by the second inner tank 12; the preheated water at least partially flows into the first water inlet.

[0147] Specifically, in this optional embodiment, the first water heating device 1 includes a first inner tank 11 and a second inner tank 12, and the first inner tank 11 and the second inner tank 12 are arranged in series. The first inner tank 11 heats the preheated water input from the first water inlet and outputs it to the second inner tank 12 through the connected first water outlet and second water inlet for reheating. The second inner tank 12 outputs the reheated hot water through the second water outlet.

[0148] Optionally, the hot water system also includes a constant temperature element 4, which includes a first inlet 41, a second inlet 42 and an output port 43, wherein the first inlet 41 is connected to the second outlet, the second inlet 42 is used to input part of the preheated water or tap water, and the output port 43 is used to output the mixed water that flows into the constant temperature element 4 from the first inlet 41 and the second inlet 42.

[0149] Specifically, it is understandable that the first water heating device 1 may further integrate a thermostatic element 4, and the first inlet 41 of the thermostatic element 4 is connected to the second water outlet to receive the hot water output by the second inner tank 12. In one embodiment, the second inlet 42 of the thermostatic element 4 may be directly connected to the water supply pipeline 3 to receive tap water input by the water supply pipeline 3, and the thermostatic element 4 mixes the tap water with the hot water output by the second inner tank 12 and delivers the mixed water to the water point 51 through the output port 43 of the thermostatic element 4. In another embodiment, the second inlet 42 of the thermostatic element 4 may also receive preheated water from the second water heating device 2, so that the thermostatic element 4 mixes the preheated water with the hot water output by the second inner tank 12 and delivers the mixed water to the water point 51 through the output port 43 of the thermostatic element 4. In other embodiments, the second inlet 42 of the thermostatic element 4 can also be connected to the pipe for inputting preheated water and the water supply pipe 3 for inputting tap water respectively, to receive water mixed with tap water and preheated water, and mix the water mixed with tap water and preheated water with the hot water output by the second inner tank 12 and then output to the water use point 51.

[0150] Optionally, the first water heating device 1 further includes a diverter element, and the diverter element is used to divert the preheated water flowing into the first water heating device 1 to the first water inlet and the second inlet 42 .

[0151] Specifically, it can be understood that when the second inlet 42 of the thermostatic element 4 inputs preheated water preheated by the second water heating device 2, the preheated water preheated by the second water heating device 2 also needs to be input into the first inner tank 11. Therefore, the preheated water part input by the second water heating device 2 to the first water heating device 1 can be diverted to the second inlet 42 of the thermostatic element 4 through the diverter element. In a specific example, the second water heating device 2 transmits the preheated water to the first water heating device 1 through the first water delivery pipeline, and a diverter element can be set on the first water delivery pipeline, and the diverter element diverts the preheated water in the first water delivery pipeline and transmits it to the second inlet 42 of the thermostatic element 4 through the second water delivery pipeline.

[0152] Optionally, the diverter element includes a three-way connector or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves. Of course, in practical applications, those skilled in the art can also select other feasible diverter elements according to actual needs, and this application does not limit this.

[0153] In an optional embodiment, the first water heating device 1 also includes a second inner tank 12; the first inner tank 11 includes a first water inlet and a first water outlet; the second inner tank 12 includes a second water inlet and a second water outlet; the first water inlet and the first water outlet are connected to the first heat exchanger 111; the first inner tank 11 and the second inner tank 12 are arranged in parallel, and the preheated water flowing into the first water heating device 1 can flow into the first inner tank 11 and the second inner tank 12 respectively through the first water inlet and the second water inlet; the preheated water flowing into the first inner tank 11 flows out from the first water outlet after being heated, and the preheated water flowing into the second inner tank 12 flows out from the second water outlet after being heated; under a predetermined state, the preheated water at least partially flows into the first water inlet.

[0154] Specifically, in this optional embodiment, the first water heating device 1 includes a first inner tank 11 and a second inner tank 12, and the first inner tank 11 and the second inner tank 12 are arranged in parallel. The first water inlet of the first inner tank 11 and the second water inlet of the second inner tank 12 respectively and independently receive preheated water, the preheated water flowing into the first inner tank 11 is heated by the first inner tank 11 and then output through the first water outlet, and the preheated water flowing into the second inner tank 12 is heated by the second inner tank 12 and then output through the second water outlet.

[0155] It should be noted that in a predetermined state, the preheated water at least partially flows into the first water inlet, and the predetermined state refers to a state in which the first inner tank 11 of the first water heating device 2 is needed. Specifically, the hot water system can operate in multiple states. When the hot water system is in a predetermined state, the first inner tank 11 needs to be used to heat water, and at least part of the preheated water flows into the first water inlet; when the hot water system is in other states, in which the first inner tank 11 is not needed, for example, only the second inner tank 12 of the first water heating device 2 is needed, then the preheated water does not flow into the first water inlet at all. In a specific example, when the first water heating device 1 includes the second inner tank 12, the preheated water can be input into the first inner tank 11 and / or the second inner tank 12 through the shunt element, so that the conduction state of the shunt element can be controlled to control the operating state of the hot water system. When the hot water system is in a predetermined state, the shunt element is controlled to input the preheated water into the first inner tank 11. When the hot water system is in other states, the shunt element is controlled to no longer input the preheated water into the first inner tank 11.

[0156] Optionally, the first water heating device 1 further includes a diverter element, and the diverter element is used to divert the preheated water flowing into the first water heating device 1 to the first water inlet and / or the second water inlet.

[0157] Specifically, at least part of the pipelines for inputting preheated water into the first inner tank 11 and the second inner tank 12 can be combined into one pipeline, and the preheated water preheated by the second water heating device 2 is received through one pipeline, and then a diverting element is provided on the pipeline so that the preheated water can be diverted to the first inner tank 11 and / or the second inner tank 12. Thus, whether to input preheated water into the two inner tanks can be controlled by controlling the diverting state of the diverting element, wherein the diverting state of the diverting element can be switched to a predetermined state so that at least part of the preheated water flows into the first water inlet so that the preheated water is input into the first inner tank 11.

[0158] Optionally, the diverter element includes a three-way connector or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves. Of course, in practical applications, those skilled in the art can also select other feasible diverter elements according to actual needs, and this application does not limit this.

[0159] It should be noted that the first water heating device 1 can also be directly connected to the water supply pipeline 3 to receive tap water input from the water supply pipeline 3. Thus, the first inner tank 11 in the first water heating device 1 can only input preheated water preheated by the second water heating device 2, or can simultaneously input preheated water preheated by the second water heating device 2 and tap water input from the water supply pipeline 3. For example, when the first inner tank 11 includes a first water inlet and a first water outlet connected to the first heat exchanger 111, the first water inlet inputs the input water into the first heat exchanger 111 and heats it and then outputs it through the first water outlet. In some embodiments, the first water inlet of the first inner tank 11 can only be connected to the pipeline for inputting preheated water, and only preheated water is input to the first heat exchanger 111. In other embodiments, the first water inlet can also be simultaneously connected to the water supply pipeline for inputting tap water and the pipeline for inputting preheated water, and receive input preheated water and / or tap water.

[0160] Similarly, the second inner tank 12 can be heated by the preheated water input through the second water heating device 2 alone, or it can be connected to the water supply pipe for inputting tap water alone to receive tap water for heating, or it can be connected to the pipe for inputting preheated water and the water supply pipe for inputting tap water at the same time to receive preheated water and / or tap water.

[0161] When the first inner tank 11 and the second inner tank 12 included in the first water heating device 1 are connected to the pipe for inputting preheated water or the water supply pipe for inputting tap water at the same time, the pipe for inputting preheated water or the water supply pipe for inputting tap water can be connected to the first inner tank 11 and the second inner tank 12 respectively through a diverter element, and the diverter element is used to control the input of preheated water and / or tap water to the first inner tank 11 and the second inner tank 12 respectively.

[0162] Optionally, the hot water system also includes a constant temperature element 4, which includes a first inlet 41, a second inlet 42 and an output port 43, wherein the first inlet 41 is used to input heated water flowing out from the first water outlet and / or the second water outlet, the second inlet 42 is used to input part of the preheated water or tap water, and the output port 43 is used to output the mixed water that flows into the constant temperature element 4 from the first inlet 41 and the second inlet 42.

[0163] Specifically, it is understandable that the first water heating device 1 may further integrate a thermostatic element 4, and the first inlet 41 of the thermostatic element 4 is connected to the first water outlet and the second water outlet, respectively, to receive the hot water output from the first inner tank 11 and / or the second inner tank 12. In one embodiment, the second inlet 42 of the thermostatic element 4 may be directly connected to the water supply pipeline 3 to receive tap water input from the water supply pipeline 3, and the thermostatic element 4 mixes the tap water with the hot water output from the first inner tank 11 and / or the second inner tank 12, and then delivers the mixed tap water to the water point 51 through the output port 43 of the thermostatic element 4. In another embodiment, the second inlet 42 of the thermostatic element 4 may also receive preheated water from the second water heating device 2, so that the thermostatic element 4 mixes the preheated water with the hot water output from the first inner tank 11 and / or the second inner tank 12, and then delivers the mixed tap water to the water point 51 through the output port 43 of the thermostatic element 4. In other embodiments, the second inlet 42 of the thermostatic element 4 can also be connected to the pipe for inputting preheated water and the water supply pipe 3 for inputting tap water respectively, to receive water mixed with tap water and preheated water, and mix the water mixed with tap water and preheated water with the hot water output by the first inner tank 11 and / or the second inner tank 12 and then output to the water use point 51.

[0164] Optionally, the preheated water input into the second inlet 42 is diverted through the diverter element.

[0165] Specifically, it is understandable that when the second inlet 42 of the thermostatic element 4 inputs preheated water preheated by the second water heating device 2, the preheated water preheated by the second water heating device 2 also needs to be input into the first inner pot 11 and / or the second inner pot. Thus, the preheated water output by the second water heating device 2 can be shunted to the first inner pot, the second inner pot and the second inlet 42 of the thermostatic element 4 respectively through the shunt element. In a specific example, the second water heating device 2 transmits the preheated water to the shunt element through the first water pipeline, and the shunt element shunts the preheated water in the first water pipeline to the second inlet 42 of the thermostatic element 4 through the second water pipeline, to the first inner pot through the third water pipeline, and to the second inner pot through the fourth water pipeline.

[0166] Optionally, the flow dividing element includes a three-way joint or a four-way joint or a three-way flow distribution valve or a four-way flow distribution valve or at least two flow regulating valves or at least two solenoid valves. Of course, in practical applications, those skilled in the art can also select other feasible flow dividing elements according to actual needs, and this application does not limit this.

[0167] Optionally, the second inner tank 12 further includes a heating element for heating the water stored in the second inner tank 12. The heating element may be a heating rod or other element, and the heating rod may heat the water stored in the second inner tank 12 after being powered on. Of course, in practical applications, the heating element may also be other elements, and the present application does not limit this.

[0168] Optionally, the hot water system may include a water pipe 5, and a plurality of water-using devices are connected to the water pipe 5, forming a plurality of water-using points 51 on the water pipe 5. After the preheated water is heated, it can be transmitted to the plurality of water-using devices through the water pipe 5. The water pipe 5 can further be connected to the water supply pipe 3, thereby forming a water circulation pipe with the first water heating device 1 and the second water heating device 2. A circulation valve 74 can be provided on the circulation pipe. When the circulation valve 74 is turned on, the circulation valve 74 uses the water in the water circulation pipe to circulate, and hot water can be transmitted to each water-using point 51 even when the user does not start the water-using device, so as to achieve the purpose of zero cold water at the water point 51.

[0169] It should be noted that a control switch can be set at any position of the water circulation pipeline to control the conduction or closing of each pipeline. In practical applications, the opening or closing of each control switch can be controlled according to the actual hot water consumption to control the conduction or closing of the corresponding pipeline, so that at least one of the first water heating device 1 and the second water heating device 2 participates in providing hot water or controls the mixing of water of different temperatures to obtain hot water of different temperatures and water volumes, thereby realizing different working modes of the hot water system.

[0170] The present application is further described below through several specific examples.

[0171] Embodiment 1

[0172] Figure 1 The hot water system of the first embodiment is shown. The hot water system includes a first water heating device 1 and a second water heating device 2. The first water heating device 1 includes a first inner tank 11. A phase change material is arranged in the first inner tank 11. The first inner tank 11 is provided with a heating component for heating the phase change material. The first inner tank 11 is provided with a first heat exchanger 111, and water flowing through the first heat exchanger 111 can exchange heat with the phase change material.

[0173] The second water heating device 2 is a gas water heater. The second water heating device 2 is connected to the water supply pipeline 3, and the tap water of the water supply pipeline 3 is input into the second water heating device 2. The second water heating device 2 preheats the tap water of the water supply pipeline 3 and then outputs the preheated water to the first water heating device 1.

[0174] The heating component in the first inner tank 11 heats the phase change material, and the heated phase change material stores heat. The first heat exchanger 111 of the first inner tank 11 in the first water heating device 1 receives the preheated water input by the second water heating device 2. The phase change material releases heat and reheats the input preheated water through the first heat exchanger 111 to obtain hot water, and the first inner tank 11 outputs the hot water to the constant temperature element 4.

[0175] The first inlet 41 of the thermostatic element 4 receives the hot water outputted by the first inner tank 11, and the second inlet 42 receives the preheated water outputted by the second water heating device 2, mixes the hot water with the preheated water to increase the temperature of the preheated water, and transmits the mixed water to the water point 51 through the output port 43. The water point 51 may include water equipment in areas such as bathrooms and kitchens.

[0176] Other features of this embodiment are similar to those of other embodiments and will not be described in detail here.

[0177] Embodiment 2

[0178] Figure 2 The hot water system of the second embodiment is shown. The hot water system includes a first water heating device 1 and a second water heating device 2. The first water heating device 1 is an electric water heater, including a first inner tank 11 and a second inner tank 12. The first inner tank 11 includes a first water inlet and a first water outlet. The second inner tank 12 includes a second water inlet and a second water outlet.

[0179] The first water inlet and the first water outlet are connected to the first heat exchanger 111. The first water inlet is used to input water into the first heat exchanger 111, and the first water outlet is used to output water heated by the first heat exchanger 111. The preheated water flows into the first heat exchanger 111 from the first water inlet. The second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner tank 12 through the second water inlet; the second water outlet is used to output hot water heated again by the second inner tank 12.

[0180] The second water heating device 2 is a gas water heater. The second water heating device 2 is connected to the water supply pipeline 3, and the tap water of the water supply pipeline 3 is input into the second water heating device 2. The second water heating device 2 preheats the tap water of the water supply pipeline 3 and then outputs the preheated water to the first water heating device 1.

[0181] The first inlet 41 of the thermostatic element 4 receives the hot water output by the second inner tank 12 , and the second inlet 42 receives the preheated water output by the second water heating device 2 , mixes the hot water with the preheated water to increase the temperature of the preheated water, and outputs the mixed water to the water use point 51 through the output port 43 .

[0182] Among them, in order to alleviate the influence of water resistance when the gas water heater provides preheated water, in this embodiment, a booster pump 6 is connected to the water supply pipe 3 for inputting tap water, and the tap water in the water supply pipe 3 is pressurized and then input into the second water heating device 2 of the gas water heater for preheating.

[0183] The second water heating device 2 is provided with a bypass pipeline in parallel. The bypass pipeline is provided with a flow control device. The flow control device may include a first solenoid valve 71, which is used to control the supply of tap water in the water supply pipeline 3 to the second water heating device 2 or the bypass pipeline, and the water flowing out of the bypass pipeline flows to the first water heating device 1 and the thermostatic element 4.

[0184] In addition, the output port 43 of the thermostatic element 4 is connected to the water pipe 5, and a plurality of water-using devices are connected to the water pipe 5, forming a plurality of water-using points 51 on the water pipe 5. The mixed water output by the thermostatic element 4 is transmitted to the plurality of water-using devices through the water pipe 5. The water pipe 5 is further connected to the water supply pipe 3, and forms a water circulation pipe with the first water heating device 1 and the second water heating device 2. A circulation valve 74 may be further provided on the circulation pipe. When the circulation valve 74 is opened, the water in the water circulation pipe circulates. When the user does not start the water-using device, the hot water output by the thermostatic element 4 can be transmitted to each water-using point 51, thereby achieving the purpose of zero cold water at the water point 51.

[0185] The hot water system of this embodiment can operate in different modes.

[0186] Mode 1: Close the thermostatic element 4, the first solenoid valve 71 and the circulation valve 74. The hot water system only heats the tap water in the water supply pipeline 3 through the second water heating device 2 and then outputs hot water for users. At this time, the second water heating device 2 can be directly connected to the water point 51 with a small amount of hot water consumption such as the kitchen, and the hot water output by the second water heating device 2 is directly transmitted to the water point 51 connected to the second water heating device 2 for use.

[0187] Mode 2: Turn on the thermostatic element 4, and close the first solenoid valve 71 and the circulation valve 74. The second water heating device 2 preheats the tap water in the water supply pipeline 3 and outputs the preheated water to the first inner tank 11 of the first water heating device 1 and the second inlet 42 of the thermostatic element 4. The output port 43 of the thermostatic element 4 outputs the water mixed with the hot water output from the second inner tank 12 of the first water heating device 1 and the preheated water to multiple water use points 51 of the water use pipeline 5, providing a large amount of hot water.

[0188] Mode 3: Open the second inlet 42 and the outlet 43 of the thermostatic element 4 and the circulation valve 74, and close the first solenoid valve 71. The water in the water circulation pipeline circulates through the second water heating device 2 and the thermostatic element 4, realizing a zero cold water circulation in which only the second water heating device 2 provides hot water.

[0189] Other features of this embodiment are similar to those of other embodiments and will not be described in detail here.

[0190] Embodiment 3

[0191] Figure 3The hot water system of the third embodiment is shown. The hot water system includes a first water heating device 1 and a second water heating device 2. The first water heating device 1 is an electric water heater, including a first inner tank 11 and a second inner tank 12. The first inner tank 11 includes a first water inlet and a first water outlet. The second inner tank 12 includes a second water inlet and a second water outlet.

[0192] The first water inlet and the first water outlet are connected to the first heat exchanger 111, the first water inlet is used to input water into the first heat exchanger 111, and the first water outlet is used to output water heated by the first heat exchanger 111. The first inner tank 11 and the second inner tank 12 are arranged in parallel, and the preheated water flowing into the first water heating device 1 can flow into the first inner tank 11 and the second inner tank 12 respectively through the first water inlet and the second water inlet; the preheated water flowing into the first inner tank 11 flows out from the first water outlet after being heated, and the preheated water flowing into the second inner tank 12 flows out from the second water outlet after being heated.

[0193] The second water heating device 2 is a gas water heater. The second water heating device 2 is connected to the water supply pipeline 3, and the tap water of the water supply pipeline 3 is input into the second water heating device 2. The second water heating device 2 preheats the tap water of the water supply pipeline 3 and outputs the preheated water to the first inner tank 11 and / or the second inner tank 12 of the first water heating device 1.

[0194] The first inlet 41 of the thermostatic element 4 receives the hot water output by the first inner tank 11 and / or the second inner tank 12, and the second inlet 42 receives the preheated water output by the second water heating device 2, mixes the hot water in the first inner tank 11 and / or the second inner tank 12 with the preheated water to increase the temperature of the preheated water, and delivers the mixed water to the water use point 51 through the output port 43.

[0195] In order to alleviate the influence of water resistance when the gas water heater provides preheated water, a booster pump 6 is connected to the water supply pipeline 3 for inputting tap water, and the tap water in the water supply pipeline 3 is pressurized and then input into the second water heating device 2 of the gas water heater for preheating.

[0196] The second water heating device 2 is provided with a bypass pipeline in parallel. The bypass pipeline is provided with a flow control device. The flow control device may include a first solenoid valve 71, which is used to control the supply of tap water in the water supply pipeline 3 to the second water heating device 2 or the bypass pipeline, and the water flowing out of the bypass pipeline flows to the first water heating device 1 and the thermostatic element 4.

[0197] In addition, the output port 43 of the thermostatic element 4 is connected to the water pipe 5, and a plurality of water-using devices are connected to the water pipe 5, forming a plurality of water-using points 51 on the water pipe 5. The mixed water output by the thermostatic element 4 is transmitted to the plurality of water-using devices through the water pipe 5. The water pipe 5 is further connected to the water supply pipe 3, and forms a water circulation pipe with the first water heating device 1 and the second water heating device 2. A circulation valve 74 may be further provided on the circulation pipe. When the circulation valve 74 is opened, the water in the water circulation pipe circulates. When the user does not start the water-using device, the hot water output by the thermostatic element 4 can be transmitted to each water-using point 51, thereby achieving the purpose of zero cold water at the water point 51.

[0198] The preheated water output by the second water heating device 2 is respectively input into the first inner tank 11 and the second inner tank 12 through two pipelines, and the second solenoid valve 72 and the third solenoid valve 73 are respectively provided on the two pipelines. By controlling the opening and closing of the second solenoid valve 72 and the third solenoid valve 73, it is possible to control whether the preheated water is input into the first inner tank 11 and the second inner tank 12.

[0199] The hot water system of this embodiment can operate in different modes.

[0200] Mode 1: The first solenoid valve 71 is closed, the second solenoid valve 72, the third solenoid valve 73 and the circulation valve 74 are opened, the first inlet 41 and the output port 43 of the thermostatic element 4 are connected, and the second inlet 42 is closed. The second water heating device 2 preheats the tap water in the water supply pipeline 3 and outputs the preheated water to the first inner tank 11 and the second inner tank 12 of the first water heating device 1. The output port 43 of the thermostatic element 4 outputs the hot water outputted from the first inner tank 11 and the second inner tank 12 of the first water heating device 1 to the multiple water use points 51 of the water use pipeline 5.

[0201] Mode 2: Close the first solenoid valve 71 and the third solenoid valve 73, open the second solenoid valve 72 and the circulation valve 74, and turn on the thermostatic element 4. The water in the water circulation pipeline circulates through the second water heating device 2, the first water heating device 1, and the thermostatic element 4, but the second water heating device 2 is not started, realizing a zero cold water circulation in which only the first water heating device 1 provides hot water.

[0202] Mode 3: The first solenoid valve 71, the second solenoid valve 72, the third solenoid valve 73, the circulation valve 74 and the thermostatic element 4 are closed, and the hot water system only heats the tap water in the water supply pipeline 3 through the second water heating device 2 and then outputs hot water for users. At this time, the second water heating device 2 can be directly connected to the water point 51 with a small amount of hot water consumption in the kitchen, etc., and the hot water output by the second water heating device 2 is directly transmitted to the water point 51 connected to the second water heating device 2 for use.

[0203] Mode 4: Open the first solenoid valve 71, the second solenoid valve 72 and the third solenoid valve 73, close the circulation valve 74, and open the thermostatic element 4. The tap water in the water supply pipeline 3 does not enter the second water heating device 2, but is directly input into the first inner tank 11 and the second inner tank 12 of the first water heating device 1 through the bypass pipeline, and hot water is provided separately through the first water heating device 1. Optionally, the booster pump 6 can be started to alleviate the water resistance when the first inner tank 11 is heated.

[0204] Mode 5: Close the first solenoid valve 71 and the circulation valve 74, open the second solenoid valve 72 and the third solenoid valve 73, and open the thermostatic element 4. At this time, the second water heating device 2 preheats the tap water in the water supply pipeline 3 and outputs the preheated water to the first inner tank 11, the second inner tank 12 of the first water heating device 1 and the second inlet 42 of the thermostatic element 4. The output port 43 of the thermostatic element 4 outputs the hot water output from the first inner tank 11 and the second inner tank 12 of the first water heating device 1 mixed with the preheated water to multiple water use points 51 of the water use pipeline 5, providing a large amount of hot water.

[0205] Other features of this embodiment are similar to those of other embodiments and will not be described in detail here.

[0206] Embodiment 4

[0207] Figure 4 The hot water system of the fourth embodiment is shown. The hot water system includes a first water heating device 1 and a second water heating device 2. The first water heating device 1 is an electric water heater, including a first inner tank 11 and a second inner tank 12. The first inner tank 11 includes a first water inlet and a first water outlet. The second inner tank 12 includes a second water inlet and a second water outlet.

[0208] The first water inlet and the first water outlet are connected to the first heat exchanger 111, the first water inlet is used to input water into the first heat exchanger 111, and the first water outlet is used to output water heated by the first heat exchanger 111. The first inner tank 11 and the second inner tank 12 are arranged in parallel, and the preheated water flowing into the first water heating device 1 can flow into the first inner tank 11 and the second inner tank 12 respectively through the first water inlet and the second water inlet; the preheated water flowing into the first inner tank 11 flows out from the first water outlet after being heated, and the preheated water flowing into the second inner tank 12 flows out from the second water outlet after being heated.

[0209] The hot water system further includes a second heat exchanger. The second heat exchanger includes a first flow channel and a second flow channel. The liquid flowing into the first flow channel and the liquid flowing into the second flow channel can exchange heat. The first flow channel is used to circulate the heating medium heated by the second water heating device. The tap water in the water supply pipeline 3 input into the second flow channel is preheated by the heating medium and then input into the first water heating device 1.

[0210] The second water heating device 2 is a gas water heater. The second water heating device 2 is connected to the water supply pipeline 3, and the tap water of the water supply pipeline 3 is input into the second water heating device 2. The second water heating device 2 heats the tap water of the water supply pipeline 3 and outputs it to the first flow channel of the second heat exchanger. The tap water flowing in the second flow channel is preheated by the hot water output by the second water heating device 2 flowing in the first flow channel and then input into the first water heating device 1.

[0211] The first flow channel of the second heat exchanger is connected to the water inlet and the water outlet of the second water heating device 2 through the preheating pipeline, so that the hot water heated by the tap water flowing out of the water outlet of the second water heating device 2 can flow into the first flow channel of the second heat exchanger through the preheating pipeline to preheat the water in the second flow channel and then be input into the second water heating device 2 from the water inlet for circulation heating. Among them, a fourth solenoid valve 75 is provided on the preheating pipeline, and the opening or closing of the fourth solenoid valve 75 can control the conduction or closing of the preheating pipeline. A fifth solenoid valve 76 is provided on the water supply pipeline 3, and the opening or closing of the fifth solenoid valve 76 can control whether tap water is input to the second water heating device 2.

[0212] The first inlet 41 of the thermostatic element 4 receives the hot water output by the first inner tank 11 and the second inner tank 12, and the second inlet 42 receives the preheated water output by the second flow channel, mixes the hot water in the first inner tank 11 and the second inner tank 12 with the preheated water to increase the temperature of the preheated water, and outputs the mixed water to the water use point 51 through the output port 43.

[0213] Among them, in order to alleviate the influence of water resistance when heating the gas water heater and the first inner tank 11, a booster pump 6 is connected to the water supply pipe 3 for inputting tap water, and the tap water in the water supply pipe 3 is pressurized before being input into the second flow channel of the second heat exchanger and the gas water heater.

[0214] In addition, the output port 43 of the thermostatic element 4 is connected to the water pipe 5, and a plurality of water-using devices are connected to the water pipe 5, forming a plurality of water-using points 51 on the water pipe 5. The mixed water output by the thermostatic element 4 is transmitted to the plurality of water-using devices through the water pipe 5. The water pipe 5 is further connected to the water supply pipe 3, and forms a water circulation pipe with the first water heating device 1 and the second water heating device 2. A circulation valve 74 may be further provided on the circulation pipe. When the circulation valve 74 is opened, the water in the water circulation pipe circulates. When the user does not start the water-using device, the hot water output by the thermostatic element 4 can be transmitted to each water-using point 51, thereby achieving the purpose of zero cold water at the water point 51.

[0215] The preheated water output from the second flow channel of the second heat exchanger is respectively input into the first inner tank 11 and the second inner tank 12 through two pipelines, on which the second solenoid valve 72 and the third solenoid valve 73 are respectively provided. Whether the preheated water is input into the first inner tank 11 and the second inner tank 12 can be controlled by controlling the opening and closing of the second solenoid valve 72 and the third solenoid valve 73.

[0216] The hot water system of this embodiment can operate in different modes.

[0217] Mode 1: Open the second solenoid valve 72, the third solenoid valve 73, the fourth solenoid valve 75 and the thermostatic element 4; close the fifth solenoid valve 76. The second water heating device 2 outputs hot water to the first flow channel of the second heat exchanger to preheat the tap water in the second flow channel, and the second flow channel inputs the preheated water into the first inner tank 11 and the second inner tank 12 of the first water heating device 1 and the second inlet 42 of the thermostatic element 4. The output port 43 of the thermostatic element 4 outputs the hot water output from the first inner tank 11 and the second inner tank 12 of the first water heating device 1 and the preheated water in the second flow channel to the multiple water use points 51 of the water use pipeline 5.

[0218] Mode 2: Close the second solenoid valve 72, the third solenoid valve 73, the fourth solenoid valve 75 and the thermostatic element 4; open the fifth solenoid valve 76. The hot water system only heats the tap water in the water supply pipeline 3 through the second water heating device 2 and then outputs hot water for users. At this time, the second water heating device 2 can be directly connected to the water point 51 with a small amount of hot water consumption such as the kitchen, and the hot water output by the second water heating device 2 is directly transmitted to the water point 51 connected to the second water heating device 2 for use.

[0219] Mode 3: Open the second solenoid valve 72, the third solenoid valve 73 and the thermostatic element 4; close the fourth solenoid valve 75 and the fifth solenoid valve 76. The tap water in the water supply pipeline 3 does not enter the second water heating device 2, but is directly input into the first inner tank 11 and the second inner tank 12 of the first water heating device 1 through the second heat exchanger, and hot water is provided separately through the first water heating device 1. Optionally, the booster pump 6 can be started to alleviate the water resistance when the first inner tank 11 is heated.

[0220] Mode 4: Open the second solenoid valve 72, the fourth solenoid valve 75 and the thermostatic element 4; close the third solenoid valve 73 and the fifth solenoid valve 76. The second water heating device 2 outputs hot water to the first flow channel of the second heat exchanger to preheat the tap water in the second flow channel, and the second flow channel inputs the preheated water into the first inner tank 11 of the first water heating device 1 and the second inlet 42 of the thermostatic element 4. The output port 43 of the thermostatic element 4 outputs the water mixed with the hot water output from the first inner tank 11 of the first water heating device 1 and the preheated water in the second flow channel to the multiple water use points 51 of the water use pipeline 5.

[0221] Based on the same principle, the present application also discloses a water heating device. The device comprises: a water inlet and a water outlet; a first inner tank 11, in which a phase change material is arranged; the first inner tank 11 is provided with a heating component for heating the phase change material; the first inner tank 11 is provided with a first heat exchanger 111, and water flowing through the first heat exchanger 111 can exchange heat with the phase change material.

[0222] The water inlet is used to input preheated water heated by the heating device; at least part of the preheated water input to the water inlet flows into the first heat exchanger 111 or at least part of the preheated water input to the water inlet flows into the first heat exchanger 111 under a predetermined state; the water outlet is used to output the preheated water heated by the water heating device.

[0223] In an optional embodiment, the heating component includes an electric heating element disposed on the first inner pot 11 and extending into the phase change material, or a heating tube disposed in the first inner pot 11 or on the outer wall of the first inner pot 11 for circulating a heating medium.

[0224] In an optional embodiment, the heating tube is a circular tube, an elliptical tube or a microchannel tube, and the heating medium is hot water supplied by a gas water heater or an electric water heater or a heating refrigerant supplied by a heat pump device.

[0225] In an optional embodiment, the water heating device further includes a second inner tank 12. The first inner tank 11 includes a first water inlet and a first water outlet; the second inner tank 12 includes a second water inlet and a second water outlet; the first water inlet of the first inner tank 11 is connected to the water inlet, and the second water outlet of the second inner tank 12 is connected to the water outlet; the first water inlet and the first water outlet are connected to the first heat exchanger 111, the first water inlet is used to input water into the first heat exchanger 111, and the first water outlet is used to output water heated by the first heat exchanger 111; the second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner tank 12 through the second water inlet; the second water outlet is used to output water heated again by the second inner tank 12; the first water inlet is used to receive at least part of the preheated water.

[0226] In an optional embodiment, the water heating device also includes a constant temperature element 4, which includes a first inlet 41, a second inlet 42 and an output port 43, wherein the first inlet 41 is connected to the second outlet, the second inlet 42 is used to input part of the preheated water or tap water, and the output port 43 is used to output the mixed water that flows into the constant temperature element 4 from the first inlet 41 and the second inlet 42.

[0227] In an optional embodiment, the water heating device further includes a diverter element, which is used to divert the inflowing preheated water to the first water inlet and the second inlet 42 .

[0228] In an optional embodiment, the flow diverter element includes a three-way connector or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves.

[0229] In an optional embodiment, the water heating device also includes a second inner tank 12; the first inner tank 11 includes a first water inlet and a first water outlet; the second inner tank 12 includes a second water inlet and a second water outlet; the first water inlet and the second water inlet are respectively connected to the water inlet part, and the first water outlet and the second water outlet are respectively connected to the water outlet part.

[0230] The first water inlet and the first water outlet are connected to the first heat exchanger 111; the first inner tank 11 and the second inner tank 12 are arranged in parallel, and the preheated water flowing into the first water heating device 1 can flow into the first inner tank 11 and the second inner tank 12 respectively through the first water inlet and the second water inlet; the preheated water flowing into the first inner tank 11 flows out from the first water outlet after being heated, and the preheated water flowing into the second inner tank 12 flows out from the second water outlet after being heated; the first water inlet is used to receive at least part of the preheated water under a predetermined state.

[0231] In an optional embodiment, a diverter element is further included, and the diverter element is used to divert the preheated water flowing into the first water heating device 1 to the first water inlet and / or the second water inlet.

[0232] In an optional embodiment, a thermostatic element 4 is further included, and the thermostatic element 4 includes a first inlet 41, a second inlet 42 and an output port 43, the first inlet 41 is used to input the heated water flowing out from the first water outlet and / or the second water outlet, the second inlet 42 is used to input the part of the preheated water or tap water, and the output port 43 is used to output the mixed water that flows into the thermostatic element 4 from the first inlet 41 and the second inlet 42.

[0233] In an optional embodiment, the second inlet 42 is connected to the diverter element.

[0234] In an optional embodiment, the flow diverter element includes a three-way connector or a four-way connector or a three-way flow distribution valve or a four-way flow distribution valve or at least two flow regulating valves or at least two solenoid valves.

[0235] In an optional embodiment, the second inner container 12 includes a heating element for heating the water stored in the second inner container 12 .

[0236] In an optional embodiment, the water heating device further includes a thermostatic element 4. The thermostatic element 4 includes a first inlet 41, a second inlet 42 and an output port 43, wherein the first inlet 41 is used to input the preheated water heated by the first water heating device 1, the second inlet 42 is used to input part of the preheated water or tap water, and the output port 43 is used to output the mixed water that flows into the thermostatic element 4 from the first inlet 41 and the second inlet 42.

[0237] Since the principle of solving the problem by this water heating device is similar to that of the above hot water system, the implementation of this water heating device can refer to the implementation of the first water heating device 1 in the hot water system, and other technical features are also similar to those in the hot water system, which will not be repeated here.

[0238] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0239] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A hot water system, characterized in that: include: a first water heating device and a second water heating device; The first water heating device comprises a first inner tank, in which a phase change material is arranged; The first liner is provided with a heating component for heating the phase change material; A first heat exchanger is disposed in the first inner tank, and water flowing through the first heat exchanger can perform heat exchange with the phase change material; The second water heating device can preheat the water input into the first water heating device, and the preheated water at least partially flows into the first heat exchanger or the preheated water at least partially flows into the first heat exchanger under a predetermined state; The first water heating device heats the preheated water and then supplies it to the water use point.

2. The hot water system according to claim 1, characterized in that: The heating component includes an electric heating element arranged on the first inner container and extending into the phase change material, or a heating tube arranged in the first inner container or on the outer wall of the first inner container and through which a heating medium flows.

3. The hot water system according to claim 2, characterized in that: The heating tube is a round tube, an elliptical tube or a microchannel tube, and the heating medium is hot water supplied by a gas water heater or an electric water heater or a heating refrigerant supplied by a heat pump device.

4. The hot water system according to claim 1, characterized in that: The second water heating device is connected to a water supply pipeline, and the water flowing into the second water heating device from the water supply pipeline is preheated by the second water heating device and then input into the first water heating device.

5. The hot water system according to claim 1, characterized in that: It also includes a second heat exchanger, which includes a first flow channel and a second flow channel. The liquid flowing into the first flow channel and the liquid flowing into the second flow channel can exchange heat. The first flow channel is used to circulate the heating medium heated by the second water heating device. The tap water in the water supply pipeline input into the second flow channel is preheated by the heating medium and then input into the first water heating device.

6. The hot water system according to claim 4, characterized in that: The second water heating device is a gas water heater or an electric water heater.

7. The hot water system according to claim 5, characterized in that: The heating medium includes water or a refrigerant.

8. The hot water system according to claim 5, characterized in that: The second water heating device is a gas water heater, an electric water heater or a heat pump water heater.

9. The hot water system according to claim 1, characterized in that: The first water heating device also includes a second inner tank; The first inner tank comprises a first water inlet and a first water outlet; The second inner tank comprises a second water inlet and a second water outlet; The first water inlet and the first water outlet are in communication with the first heat exchanger, the first water inlet is used to input water into the first heat exchanger, and the first water outlet is used to output water heated by the first heat exchanger; The second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner pot through the second water inlet; the second water outlet is used to output the water heated again by the second inner pot; At least part of the preheated water flows into the first water inlet.

10. The hot water system according to claim 9, characterized in that: The first water heating device also includes a constant temperature element, which includes a first inlet, a second inlet and an outlet, the first inlet is connected to the second outlet, the second inlet is used to input part of the preheated water or tap water, and the outlet is used to output the mixed water that flows into the constant temperature element from the first inlet and the second inlet.

11. The hot water system according to claim 10, characterized in that: The first water heating device further comprises a diverter element, and the diverter element is used to divert the preheated water flowing into the first water heating device to the first water inlet and the second inlet.

12. The hot water system according to claim 11, characterized in that The flow dividing element comprises a three-way joint or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves.

13. The hot water system according to claim 1, characterized in that: The first water heating device also includes a second inner tank; The first inner tank comprises a first water inlet and a first water outlet; The second inner tank comprises a second water inlet and a second water outlet; The first water inlet and the first water outlet are in communication with the first heat exchanger; The first inner pot and the second inner pot are arranged in parallel, and the preheated water flowing into the first water heating device can flow into the first inner pot and the second inner pot through the first water inlet and the second water inlet respectively; the preheated water flowing into the first inner pot flows out from the first water outlet after being heated, and the preheated water flowing into the second inner pot flows out from the second water outlet after being heated; In a predetermined state, at least a portion of the preheated water flows into the first water inlet.

14. The hot water system according to claim 13, characterized in that The first water heating device further comprises a diverter element, and the diverter element is used to divert the preheated water flowing into the first water heating device to the first water inlet and / or the second water inlet.

15. The hot water system according to claim 14, characterized in that The first water heating device also includes a constant temperature element, which includes a first inlet, a second inlet and an output port, the first inlet is used to input the heated water flowing out from the first water outlet and / or the second water outlet, the second inlet is used to input the part of the preheated water or tap water, and the output port is used to output the mixed water that flows into the constant temperature element from the first inlet and the second inlet.

16. The hot water system according to claim 15, characterized in that The preheated water input into the second inlet is diverted through the diverter element.

17. The hot water system according to claim 15, characterized in that The flow dividing element comprises a three-way joint or a four-way joint or a three-way flow distribution valve or a four-way flow distribution valve or at least two flow regulating valves or at least two solenoid valves.

18. The hot water system according to any one of claims 9 to 17, characterized in that: The second inner container further comprises a heating element for heating the water stored in the second inner container.

19. The hot water system according to claim 1, characterized in that It also includes a flow control device and a bypass pipeline arranged in parallel with the second water heating device. The flow control device is used to supply tap water in the water supply pipeline to the second water heating device or the bypass pipeline, and the water flowing out of the bypass pipeline flows to the first water heating device.

20. The hot water system according to claim 19, characterized in that The flow control device is arranged on the bypass pipeline, and the flow control device is a solenoid valve.

21. The hot water system according to claim 1, characterized in that further comprising a thermostatic element; The thermostatic element includes a first inlet, a second inlet and an output port, the first inlet is used to input the preheated water heated by the first water heating device, the second inlet is used to input part of the preheated water or tap water, and the output port is used to output the mixed water that flows into the thermostatic element from the first inlet and the second inlet to the water use point.

22. The hot water system according to claim 21, characterized in that The thermostatic element is integrated on the first water heating device.

23. The hot water system according to claim 1, characterized in that further comprising a water softening module; The soft water module is used to soften the water input into the first water heating device.

24. The hot water system according to claim 23, characterized in that The soft water module is disposed upstream or downstream of the second water heating device, and is used to soften water flowing into or out of the second water heating device.

25. A water heating device, characterized in that: include: Water inlet and outlet; a first liner, wherein a phase change material is disposed in the first liner; The first liner is provided with a heating component for heating the phase change material; A first heat exchanger is disposed in the first inner tank, and water flowing through the first heat exchanger can perform heat exchange with the phase change material; The water inlet is used to input preheated water heated by the heating device; At least part of the preheated water input into the water inlet flows into the first heat exchanger or at least part of the preheated water input into the water inlet flows into the first heat exchanger under a predetermined state; The water outlet is used to output the preheated water heated by the water heating device.

26. The water heating device according to claim 25, characterized in that The heating component includes an electric heating element arranged on the first inner container and extending into the phase change material, or a heating tube arranged in the first inner container or on the outer wall of the first inner container and through which a heating medium flows.

27. The water heating device according to claim 26, characterized in that The heating tube is a round tube, an elliptical tube or a microchannel tube, and the heating medium is hot water supplied by a gas water heater or an electric water heater or a heating refrigerant supplied by a heat pump device.

28. The water heating device according to claim 25, characterized in that Also includes a second liner; The first inner tank comprises a first water inlet and a first water outlet; The second inner tank comprises a second water inlet and a second water outlet; The first water inlet of the first inner container is connected to the water inlet portion, and the second water outlet of the second inner container is connected to the water outlet portion; The first water inlet and the first water outlet are in communication with the first heat exchanger, the first water inlet is used to input water into the first heat exchanger, and the first water outlet is used to output water heated by the first heat exchanger; The second water inlet is connected to the first water outlet, and the water flowing out of the first water outlet flows into the second inner pot through the second water inlet; the second water outlet is used to output the water heated again by the second inner pot; The first water inlet is used to receive at least part of the preheated water.

29. The water heating device according to claim 28, characterized in that It also includes a constant temperature element, which includes a first inlet, a second inlet and an outlet, the first inlet is connected to the second outlet, the second inlet is used to input part of the preheated water or tap water, and the outlet is used to output the mixed water that flows into the constant temperature element from the first inlet and the second inlet.

30. The water heating device according to claim 29, characterized in that It also includes a diverter element, which is used to divert the inflowing preheated water to the first water inlet and the second inlet.

31. The water heating device according to claim 30, characterized in that The flow dividing element comprises a three-way joint or a three-way flow distribution valve or at least two solenoid valves or at least two flow regulating valves.

32. The water heating device according to claim 25, characterized in that Also includes a second liner; The first inner tank comprises a first water inlet and a first water outlet; The second inner tank comprises a second water inlet and a second water outlet; The first water inlet and the second water inlet are respectively connected to the water inlet portion, and the first water outlet and the second water outlet are respectively connected to the water outlet portion; The first water inlet and the first water outlet are in communication with the first heat exchanger; The first inner pot and the second inner pot are arranged in parallel, and the preheated water flowing into the first water heating device can flow into the first inner pot and the second inner pot through the first water inlet and the second water inlet respectively; the preheated water flowing into the first inner pot flows out from the first water outlet after being heated, and the preheated water flowing into the second inner pot flows out from the second water outlet after being heated; The first water inlet is used to receive at least part of the preheated water in a predetermined state.

33. The water heating device according to claim 32, characterized in that It also includes a diverter element, which is used to divert the preheated water flowing into the first water heating device to the first water inlet and / or the second water inlet.

34. The water heating device according to claim 33, characterized in that It also includes a constant temperature element, which includes a first inlet, a second inlet and an output port, the first inlet is used to input the heated water flowing out from the first water outlet and / or the second water outlet, the second inlet is used to input the part of the preheated water or tap water, and the output port is used to output the mixed water that flows into the constant temperature element from the first inlet and the second inlet.

35. The water heating device according to claim 34, characterized in that The second inlet is connected to the flow dividing element.

36. The water heating device according to claim 34, characterized in that The flow dividing element comprises a three-way joint or a four-way joint or a three-way flow distribution valve or a four-way flow distribution valve or at least two flow regulating valves or at least two solenoid valves.

37. The water heating device according to any one of claims 28 to 36, characterized in that: The second inner container includes a heating element for heating the water stored in the second inner container.

38. The water heating device according to claim 25, characterized in that The water heating device also includes a thermostatic element; The thermostatic element includes a first inlet, a second inlet and an output port, the first inlet is used to input the preheated water heated by the first water heating device, the second inlet is used to input part of the preheated water or tap water, and the output port is used to output the water mixed after flowing into the thermostatic element from the first inlet and the second inlet.

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