A dual-liner water heater mixed hot water capacity-increasing system

Abstract

The present invention provides a dual-liner water heater mixed hot water capacity-increasing system, which includes an inlet water tank and an outlet water tank. The inlet water tank is provided with a cold water inlet pipe and a preheated water outlet pipe. Cold water enters a heat exchange box communicated with the inlet water tank through the cold water inlet pipe. The preheated water outlet pipe passes through the heat exchange box and is communicated with the outlet water tank, and the preheated water outlet pipe and the cold water conduct the first heat exchange in the heat exchange box. Among them, the first heat exchange includes the transfer of part of the heat of the water flow in the preheated water outlet pipe to the cold water in the heat exchange box. It effectively solves the problem that the temperature of the hot water delivered from the inlet water tank to the outlet water tank in the dual-liner water heater is too high, resulting in the over-standard output hot water temperature of the water heater or causing malfunction, and improves the upper limit of the set heating temperature of the inlet water tank, enables the effective recovery and recycling of heat energy in the system, reduces unnecessary temperature conduction, improves the heating rate and heating efficiency, and significantly increases the output of warm and hot water of the water heater.

Description

Technical Field

[0001] The present invention relates to the technical field of electric water heaters, and more particularly to a mixed hot water capacity increasing system for a double-inside-tank water heater. Background Art

[0002] At present, in order to solve the problems of too large volume and too long heating speed of electric water heaters, double-inside-tank storage electric water heaters are promoted, especially fast-heating double-inside-tank storage water heaters. The water inlet tank provides heated hot water to the water outlet tank. The water inlet tank and the water outlet tank each account for about half of the rated volume. The water inlet tank only accounts for about half of the rated volume. The temperature of the water inlet tank drops relatively fast due to the discharge of hot water, so the electric heating tube of the water inlet pipe can be started earlier and faster, relatively increasing the working time of the heating system and increasing the hot water output.

[0003] However, when the double-inside-tank design is adopted, the water outlet tank needs to receive the hot water from the water inlet tank, and the hot water temperature in the water outlet tank is very easy to be too high. It is necessary that the temperature of the water inlet tank does not exceed 80 °C, otherwise it is very easy to cause the water temperature in the water outlet tank to be too high, which limits the hot water output of the whole system. At the same time, in the later stage of the water outlet of the water heater system, the water temperature at the input end of the water outlet tank is already very low. When the water outlet pipe of the water outlet tank passes through the input end of the inner tank, it exchanges heat with the cold water at the input end of the inner tank, further reducing the hot water temperature at the outlet. As a result, although the temperature at the top is above 38 °C, after heat exchange with the cold water at the bottom, the water temperature has dropped below 38 °C, forming ineffective hot water and causing part of the heat energy to be unable to be effectively output. During the heating period, due to the insufficient heat dissipation area of the electric heating tube at the top of the water outlet tank and the lack of barrier between the top and the bottom, an effective local heating space cannot be formed, and the local hot water at the top cannot be effectively heated in a short time. At the same time, affected by the mixing of water flow, the outlet water temperature drops below 38 °C and becomes ineffective hot water, all of which affect the effective hot water output of the whole water heater. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems of low heating efficiency, large temperature loss and insufficient hot water output in double-inside-tank water heaters in the prior art.

[0005] For this purpose, the present invention provides a mixed hot water capacity increasing system for a double-inside-tank water heater.

[0006] The present invention provides a mixed hot water capacity increasing system for a double-inside-tank water heater, including a water inlet tank and a water outlet tank. The water inlet tank is provided with a cold water inlet pipe and a preheating outlet pipe. Cold water enters the heat exchange box communicated with the water inlet tank through the cold water inlet pipe. The preheating outlet pipe passes through the heat exchange box and is communicated with the water outlet tank. The preheating outlet pipe and the cold water perform the first heat exchange in the heat exchange box;

[0007] Wherein, the first heat exchange includes the transfer of part of the heat of the water flow in the preheating outlet pipe to the cold water in the heat exchange box.

[0008] A hybrid hot water capacity increasing system for a double-inside-tank water heater proposed by the present invention. The heat exchange box can be arranged inside the water inlet tank or outside the water inlet tank. Preferably, the heat exchange box can be arranged inside the water inlet tank, and cold water can only enter the water inlet tank after passing through the heat exchange box. The hot water heated in the water inlet tank is output to the water outlet tank through the preheating water outlet pipe; the preheating water outlet pipe passes through the heat exchange box, that is, at least part of the preheating water outlet pipe is arranged inside the heat exchange box, so that the hot water in the preheating water outlet pipe exchanges heat with the cold water in the heat exchange box for the first time, appropriately reducing the temperature of the hot water entering the water outlet tank, and using this part of the heat to heat the cold water inlet, which is equivalent to the heat energy recovery of the hot water in the preheating water outlet pipe of the water heater. The heated cold water inlet is evenly distributed at the bottom of the water inlet tank through the drain holes arranged on the heat exchange box. With the continuous input of the cold water inlet, the water inlet tank is filled with the cold water inlet after the first heat exchange, that is, the cold water inlet with a relatively higher temperature, which can significantly improve the heating efficiency of the water inlet tank and ensure that the temperature input to the water outlet tank will not be too high to cause misoperation of the overheat protector;

[0009] The heat exchange area of the first heat exchange can be increased by increasing the pipe area of the part of the preheating water outlet pipe arranged inside the heat exchange box, such as setting a coil structure. At the same time, after the heat exchange area is certain, the greater the temperature difference between the water flow temperature in the preheating water outlet pipe and the cold water inlet, the greater the heat exchange amount; the smaller the temperature difference between the water flow temperature in the preheating water outlet pipe and the cold water inlet, the smaller the heat exchange amount. That is, when the water temperature in the water inlet tank is relatively low, the warm water output of the whole system will not be reduced due to the influence of the heat exchange box.

[0010] A hybrid hot water capacity increasing system for a double-inside-tank water heater according to the above technical solution of the present invention may further have the following additional technical features:

[0011] In the above technical solution, the water outlet tank is provided with a preheating water inlet pipe and a hot water outlet pipe, and the preheating water outlet pipe is communicated with the preheating water inlet pipe; the hot water outlet pipe extends towards one end of the water outlet tank so that the water inlet of the hot water outlet pipe is far from the water outlet of the preheating water inlet pipe;

[0012] At least part of the pipe body of the hot water outlet pipe is sleeved with a heat insulation member, and the heat insulation member is used to reduce the second heat exchange between the water flow in the hot water outlet pipe and the water flow at one end of the water outlet tank close to the preheating water inlet pipe.

[0013] In this technical solution, the preheating outlet pipe of the water inlet tank conveys the hot water in the water inlet tank to the water outlet tank through the preheating inlet pipe of the water outlet tank. A water dispersing sleeve is arranged at the output end of the preheating inlet pipe to disperse the water flow at the bottom of the water outlet tank. With continuous input, the liquid level in the water outlet tank gradually rises. The hot water outlet pipe is used to convey the hot water in the water outlet tank to the outside of the water heater. The water inlet of the hot water outlet pipe and the water outlet of the preheating inlet pipe are respectively arranged near both ends of the water outlet tank to reduce the influence of the relatively low-temperature water output by the preheating inlet pipe on the water flow temperature near the water inlet of the hot water outlet pipe. An adiabatic member is sleeved on the lower side of the hot water outlet pipe. The adiabatic member can be an adiabatic sleeve made of adiabatic and heat-insulating materials. Its function is to reduce the secondary heat exchange between the hot water in the hot water outlet pipe and the relatively low-temperature water entering the water outlet tank through the preheating inlet pipe. Especially when the water temperature near the water inlet of the hot water outlet pipe in the water outlet tank is already around 40°C, it can effectively prevent the hot water in the hot water outlet pipe from exchanging heat with the low-temperature water at the lower part of the water outlet tank, resulting in the hot water temperature dropping below 36°C and forming ineffective hot water.

[0014] In the above technical solution, a partition member is arranged between the water outlet of the preheating inlet pipe and the water inlet of the hot water outlet pipe, and the partition member is arranged perpendicular or inclined to the water flow direction in the water outlet tank.

[0015] In this technical solution, the partition member can be fixed to the inner wall of the water outlet tank, or fixedly connected to the hot water outlet pipe, or connected to the water outlet tank heater. In this specification, the water flow direction in the water outlet tank should be understood as the direction of the water flow at the bottom of the water outlet tank flowing towards the water inlet of the hot water outlet pipe. Arranging the partition member perpendicular or inclined to the water flow direction in the water outlet tank can effectively reduce the influence of the relatively low-temperature water flowing out from the water outlet of the preheating inlet pipe on the water temperature near the water inlet of the hot water outlet pipe.

[0016] In the above technical solution, a water outlet heating pipe is arranged in the water outlet tank, and the partition member is connected to the water outlet heating pipe.

[0017] In this technical solution, the partition member is connected to the top of the water outlet tank heating pipe and can be made of a material with good thermal conductivity, such as a copper sheet. At this time, the partition member serves as a heat dissipation fin of the water outlet heating pipe, which can effectively improve the heating efficiency of the water outlet heating pipe.

[0018] In the above technical solution, the partition member is arranged near the water inlet of the hot water outlet pipe. The partition member and the inner wall of the water outlet tank cooperate to form a relatively closed space near the water inlet of the hot water outlet pipe. The relatively closed space is used to reduce the temperature influence of the water flow outside the space on the water flow inside the space and improve the heating efficiency in the relatively closed space.

[0019] In this technical solution, the water inlet of the hot water outlet pipe is arranged above the partition member, and a relatively enclosed space is formed in the upper part of the partition member, that is, the water inlet of the hot water outlet pipe is arranged in the relatively enclosed space, reducing the influence of the cold water in the lower part of the partition member on the water temperature near the water inlet of the hot water outlet pipe, and using its heat dissipation fin function to heat the passing cold water and the water flow in the relatively enclosed space, thus improving the hot water output efficiency.

[0020] In the above technical solution, the partition member is provided with a plurality of water passing holes.

[0021] In this technical solution, the partition member is a sheet structure, and a plurality of water passing holes are arranged on the sheet structure to ensure that the water flow smoothly enters the relatively enclosed space and effectively inhibits the formation of water flow turbulence, avoiding taking away part of the heat after the formation of turbulence. The diameter of the water passing holes is between 1-4 mm. Preferably, small round holes with a diameter of about 2 mm are used as the water passing holes, and the effect is better.

[0022] In the above technical solution, the water outlet tank and the water inlet tank are communicated through a connecting pipeline, the preheating outlet pipe is connected to the connecting pipeline, and at least part of the connecting pipeline is wrapped with a heat insulation layer.

[0023] In this technical solution, the connecting pipeline is arranged outside the water outlet tank and the water inlet tank, and the preheating inlet pipe and the preheating outlet pipe are respectively connected to the connecting pipeline. Since heat loss is also likely to occur in the connecting pipeline part, a heat insulation layer is wrapped outside the connecting pipeline to reduce the heat loss at the position of the connecting pipeline.

[0024] In any of the above technical solutions, the highest water temperature set in the water inlet tank is negatively correlated with the temperature of the cold water inlet. The lower the temperature of the cold water inlet, the higher the highest water temperature set in the water inlet tank.

[0025] In this technical solution, since the temperature of the hot water entering the water outlet tank is effectively reduced, the highest water temperature that can be set in the water inlet tank can be correspondingly increased, that is, the upper limit of the heating power of the water inlet tank is increased. The setting of the highest water temperature is negatively correlated with the temperature of the cold water inlet. The lower the cold water inlet temperature, the higher the highest water temperature that can be set in the water inlet tank. For example, when the cold water inlet temperature is 5 °C, the highest water temperature of the water inlet tank can be set at about 90 °C, and when the cold water inlet temperature is 15 °C, the highest water temperature of the water inlet tank can be set at about 85 °C.

[0026] In any of the above technical solutions, the water temperature input from the preheating outlet pipe to the water outlet tank is not greater than 85 °C.

[0027] In this technical solution, the pipeline area of the preheating outlet pipe arranged in the heat exchange box can be designed to control the heat exchange efficiency of the first heat exchange. When the inlet water temperature is known, the highest limit value of the water temperature entering the water outlet tank is controlled to avoid too high outlet water temperature.

[0028] In any of the above technical solutions, the water inlet tank is provided with a water inlet tank heater and a water inlet tank temperature detector, the water outlet tank is provided with a water outlet tank heater and a water outlet tank temperature detector, and the water inlet tank heater, the water inlet tank temperature detector, the water outlet tank heater and the water outlet tank temperature detector are all connected to the control module;

[0029] The specific heating process is as follows. After cold water enters the water inlet tank, the water inlet tank heater heats at the rated power. As the temperature of the water outlet tank system drops, the water outlet tank heater starts to heat. The water outlet tank heater and the water inlet tank heater heat simultaneously or alternately. At this time, the total power of the water outlet tank heater and the water inlet tank heater is guaranteed to be the rated power. When the temperature of the water outlet tank system drops further, the water inlet tank heater is turned off, and the water outlet tank heater heats at the rated power.

[0030] In this technical solution, the water inlet tank temperature detector is used to detect the real-time temperature of each detection point in the water inlet tank and transmit the detection data to the control module. The water outlet tank temperature detector is used to detect the real-time temperature of each detection point in the water outlet tank and transmit the detection data to the control module. The control module adjusts the set temperature and heating power of the water inlet tank according to the temperature of the cold water entering the water inlet tank, avoiding the hot water temperature output to the water outlet tank being too high when the cold water inlet temperature in the water inlet tank is relatively high, resulting in the water outlet temperature of the water outlet tank exceeding the standard or malfunctioning; when using hot water, the control module turns on the water inlet tank heater to heat within the shortest time after the cold water inlet enters the water inlet tank, ensuring that the heating time of the whole system is longer;

[0031] The control module is also used to distribute the power between the water outlet tank heater and the water inlet tank heater to ensure that the sum of their powers does not exceed the rated power of the water heater. Specifically, after cold water enters the water inlet tank, the water inlet tank heater heats at the rated power of the water heater. As the temperature of the water outlet tank system drops, the water outlet tank heater starts to heat. The water outlet tank heater and the water inlet tank heater heat simultaneously or alternately. When the water outlet tank heater and the water inlet tank heater heat simultaneously, the sum of the powers of the water outlet tank heater and the water inlet tank heater is the rated power of the water heater; when the water outlet tank heater and the water inlet tank heater heat alternately, the water outlet tank heater and the water inlet tank heater respectively heat briefly at the rated power of the water heater; when the water temperature in the water outlet tank drops further, the water outlet tank heater of the water heater heats at the rated power of the water heater to maximize the output of warm and hot water from the water outlet tank.

[0032] In any of the above technical solutions, the water inlet tank heater includes at least two water inlet heating pipes, and the powers of several of the water inlet heating pipes are arranged in an increasing trend along the direction close to the cold water inlet pipe;

[0033] The water outlet tank heater includes at least two water outlet heating pipes, and the powers of several of the water outlet heating pipes are arranged in an increasing trend along the direction close to the water inlet of the hot water outlet pipe.

[0034] In this technical solution, the water inlet tank heater includes an upper heating pipe of the water inlet tank and a lower heating pipe of the water inlet tank. The upper heating pipe of the water inlet tank is arranged away from the cold water inlet pipe, and the lower heating pipe of the water inlet tank is arranged close to the cold water inlet pipe. The power of the upper heating pipe of the water inlet tank is less than that of the lower heating pipe of the water inlet tank. For example, the power of the upper heating pipe of the water inlet tank is 2 kW, and the power of the lower heating pipe of the water inlet tank is 3 kW;

[0035] The water outlet tank heater includes an upper heating pipe of the water outlet tank and a lower heating pipe of the water outlet tank. The upper heating pipe of the water outlet tank is arranged close to the water outlet of the hot water outlet pipe, and the lower heating pipe of the water outlet tank is arranged away from the water outlet of the hot water outlet pipe. The power of the upper heating pipe of the water outlet tank is greater than that of the lower heating pipe of the water outlet tank. For example, the power of the upper heating pipe of the water outlet tank is 3 kW, and the power of the lower heating pipe of the water outlet tank is 2 kW;

[0036] When using water, as the hot water in the water outlet tank is output, it drives cold water into the water inlet tank. The upper heating pipe and the lower heating pipe of the water inlet tank are both heated with a total power of 5 kW. When the water temperature at the outlet of the hot water outlet pipe drops to 70 °C and below, the lower heating pipe in the water outlet tank starts to work instead of the upper heating pipe of the water inlet tank, and the upper heating pipe of the water inlet tank does not work, ensuring that the overall power remains 5 kW unchanged; when the water temperature at the outlet of the hot water outlet pipe reaches or is lower than 65 °C, the upper heating pipe of the water outlet tank starts to work, the upper heating pipe of the water inlet tank works, and other heating pipes do not work, ensuring that the total power of the system is 5 kW; after the water temperature at the outlet of the hot water outlet pipe is lower than 55 °C, the upper heating pipe and the lower heating pipe of the water outlet tank work together, and the heating pipes in the water inlet tank do not work, so that the total power is still 5 kW. When not using water for heating, the reverse heating sequence can be adopted for dynamic fine-tuning to ensure that the water outlet tank and the water inlet tank reach the set temperature at the fastest speed, eliminate the problem of uneven temperature in the tank temperature field and the influence of the temperature field on other tanks, and prevent the temperature of adjacent tanks from exceeding the standard.

[0037] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0038] A dual-tank water heater mixed hot water capacity increasing system is provided, which effectively solves the problem that the hot water transported from the water inlet tank to the water outlet tank in the dual-tank water heater is too hot, resulting in the over-standard output hot water temperature of the water heater or causing malfunction, and improves the upper limit of the set heating temperature of the water inlet tank, enables the effective recovery and recycling of heat energy in the system, reduces unnecessary temperature conduction, improves the heating rate and heating efficiency, and significantly increases the warm and hot water output of the water heater.

[0039] The additional aspects and advantages of the present invention will become apparent in the following description section or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0041] Figure 1 is a structural diagram of a mixed hot water capacity increasing system of a double-inside-tank water heater according to an embodiment of the present invention;

[0042] Figure 2 is a structural diagram of the internal pipeline of the water inlet tank in a mixed hot water capacity increasing system of a double-inside-tank water heater according to an embodiment of the present invention;

[0043] Figure 3 is a schematic structural diagram of the internal pipeline of the water inlet tank after removing the heat exchange box in a mixed hot water capacity increasing system of a double-inside-tank water heater according to an embodiment of the present invention;

[0044] Figure 4 is a perspective view of the internal pipeline of the water outlet tank in a mixed hot water capacity increasing system of a double-inside-tank water heater according to an embodiment of the present invention.

[0045] Wherein, Figures 1 to 4 the corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0046] 1, water inlet tank; 2, water outlet tank; 3, connecting pipeline;

[0047] 11, preheating water outlet pipe; 12, heat exchange box; 13, cold water inlet pipe; 14, water inlet tank temperature detector; 15, water inlet tank heater;

[0048] 21, hot water outlet pipe; 22, water dispersing sleeve; 23, preheating water inlet pipe; 24, water outlet tank temperature detector; 25, water outlet tank heater; 26, heat insulation member; 27, partition member;

[0049] 271, water passing hole;

[0050] 31, heat insulation layer. Detailed embodiments

[0051] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0052] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0053] The following refers to Figures 1 to 4Describe a mixed hot water capacity increasing system for a double - inner - tank water heater provided according to some embodiments of the present invention.

[0054] Some embodiments of the present application provide a mixed hot water capacity increasing system for a double - inner - tank water heater.

[0055] As Figures 1 to 4 shown, the first embodiment of the present invention proposes a mixed hot water capacity increasing system for a double - inner - tank water heater, including an inlet water tank 1 and an outlet water tank 2. The inlet water tank 1 is provided with a cold water inlet pipe 13 and a pre - heated water outlet pipe 11. Cold water enters the heat exchange box 12 communicated with the inlet water tank 1 through the cold water inlet pipe 13. The pre - heated water outlet pipe 11 passes through the heat exchange box 12 and is communicated with the outlet water tank 2. The pre - heated water outlet pipe 11 and the cold water conduct the first heat exchange in the heat exchange box 12.

[0056] Among them, the first heat exchange includes the transfer of part of the heat of the water flow in the pre - heated water outlet pipe 11 to the cold water in the heat exchange box 12.

[0057] For the mixed hot water capacity increasing system for a double - inner - tank water heater proposed in this embodiment, the heat exchange box 12 can be arranged inside the inlet water tank 1 or outside the inlet water tank 1. Preferably, the heat exchange box 12 can be arranged inside the inlet water tank 1. Cold water can enter the inlet water tank 1 only after passing through the heat exchange box 12. The heated hot water in the inlet water tank 1 is output to the outlet water tank 2 through the pre - heated water outlet pipe 11. The pre - heated water outlet pipe 11 passes through the heat exchange box 12, that is, at least part of the pre - heated water outlet pipe 11 is arranged inside the heat exchange box 12, so that the hot water in the pre - heated water outlet pipe 11 conducts the first heat exchange with the cold water in the heat exchange box 12 in the heat exchange box 12, making the temperature of the hot water entering the outlet water tank 2 decrease appropriately, and using this part of the heat to heat the cold water inlet, which is equivalent to the heat energy recovery of the hot water in the pre - heated water outlet pipe 11 of the water heater. The heated cold water inlet is evenly distributed at the bottom of the inlet water tank 1 through the drain holes arranged on the heat exchange box 12. With the continuous input of the cold water inlet, the inlet water tank 1 is filled with the cold water inlet after the first heat exchange, that is, the cold water inlet with a relatively high temperature, which can significantly improve the heating efficiency of the inlet water tank 1 and ensure that the temperature input to the outlet water tank 2 will not be too high to cause the malfunction of the overheat protector.

[0058] The heat exchange area of the first heat exchange can be increased by increasing the pipe area of the part of the pre - heated water outlet pipe 11 arranged inside the heat exchange box 12, such as setting a coil structure. At the same time, after the heat exchange area is certain, the greater the temperature difference between the water flow temperature in the pre - heated water outlet pipe 11 and the cold water inlet, the greater the heat exchange amount; the smaller the temperature difference between the water flow temperature in the pre - heated water outlet pipe 11 and the cold water inlet, the smaller the heat exchange amount. That is, when the water temperature in the inlet water tank 1 is relatively low, the warm water output of the whole system will not be reduced due to the influence of the heat exchange box 12.

[0059] The second embodiment of the present invention proposes a mixed hot water capacity increasing system for a double-liner water heater, and on the basis of the first embodiment, as Figures 1 to 4 shown, the water outlet liner 2 is provided with a preheating water inlet pipe 23 and a hot water outlet pipe 21, and the preheating water outlet pipe 11 is communicated with the preheating water inlet pipe 23; the hot water outlet pipe 21 extends towards one end of the water outlet liner 2, so that the water inlet of the hot water outlet pipe 21 is far away from the water outlet of the preheating water inlet pipe 23;

[0060] At least a part of the pipe body of the hot water outlet pipe 21 is sleeved with a heat insulation member 26, and the heat insulation member 26 is used to reduce the second heat exchange between the water flow in the hot water outlet pipe 21 and the water flow near one end of the water outlet liner 2 close to the preheating water inlet pipe 23.

[0061] In this embodiment, the preheating water outlet pipe 11 of the water inlet liner 1 transports the hot water in the water inlet liner 1 to the water outlet liner 2 through the preheating water inlet pipe 23 of the water outlet liner 2. A water dispersing sleeve 22 is arranged at the output end of the preheating water inlet pipe 23 to disperse the water flow at the bottom of the water outlet liner 2. With continuous input, the liquid level in the water outlet liner 2 gradually rises; the hot water outlet pipe 21 is used to transport the hot water in the water outlet liner 2 to the outside of the water heater. The water inlet of the hot water outlet pipe 21 and the water outlet of the preheating water inlet pipe 23 are respectively arranged near the two ends of the water outlet liner 2 to reduce the influence of the relatively low-temperature water output by the preheating water inlet pipe 23 on the water flow temperature near the water inlet of the hot water outlet pipe 21. An adiabatic member 26 is sleeved on the lower side of the hot water outlet pipe 21. The adiabatic member 26 can be an adiabatic sleeve made of adiabatic and heat-insulating materials. Its function is to reduce the second heat exchange between the hot water in the hot water outlet pipe 21 and the relatively low-temperature water entering the water outlet liner 2 through the preheating water inlet pipe 23. Especially when the water temperature near the water inlet of the hot water outlet pipe 21 of the water outlet liner 2 is about 40°C, it can effectively avoid the situation that the hot water in the hot water outlet pipe 21 exchanges heat with the low-temperature water at the lower part of the water outlet liner 2, resulting in the hot water temperature dropping below 36°C and forming ineffective hot water.

[0062] The third embodiment of the present invention proposes a mixed hot water capacity increasing system for a double-liner water heater, and on the basis of any of the above embodiments, as Figures 1 to 4 shown, a partition member 27 is arranged between the water outlet of the preheating water inlet pipe 23 and the water inlet of the hot water outlet pipe 21, and the partition member 27 is arranged perpendicular to or inclined to the water flow direction in the water outlet liner 2.

[0063] In this embodiment, the partition member 27 can be fixed to the inner wall of the water outlet tank 2, or fixedly connected to the hot water outlet pipe 21, or connected to the water outlet tank heater 25. The water flow direction in the water outlet tank 2 described in this specification should be understood as the direction of the water flow at the bottom of the water outlet tank 2 flowing towards the water inlet of the hot water outlet pipe 21. The partition member 27 is arranged perpendicular or inclined to the water flow direction in the water outlet tank 2, which can effectively reduce the influence of the relatively low-temperature water flowing out from the water outlet of the preheating inlet pipe 23 on the water temperature near the water inlet of the hot water outlet pipe 21.

[0064] The fourth embodiment of the present invention proposes a dual-tank water heater mixed hot water capacity increasing system, and on the basis of any one of the above embodiments, as Figures 1 to 4 shown, an outlet water heating pipe is provided in the water outlet tank 2, and the partition member 27 is connected to the outlet water heating pipe.

[0065] In this embodiment, the partition member 27 is connected to the top of the heating pipe of the water outlet tank 2 and can be made of a material with good heat conduction performance, such as a copper sheet. At this time, the partition member 27 serves as a heat dissipation fin of the outlet water heating pipe, which can effectively improve the heating efficiency of the outlet water heating pipe.

[0066] The fifth embodiment of the present invention proposes a dual-tank water heater mixed hot water capacity increasing system, and on the basis of any one of the above embodiments, as Figures 1 to 4 shown, the partition member 27 is arranged near the water inlet of the hot water outlet pipe 21, and the partition member 27 and the inner wall of the water outlet tank 2 cooperate to form a relatively enclosed space near the water inlet of the hot water outlet pipe 21. The relatively enclosed space is used to reduce the temperature influence of the water flow outside the space on the water flow inside the space and improve the heating efficiency in the relatively enclosed space.

[0067] In this embodiment, the water inlet of the hot water outlet pipe 21 is arranged above the partition member 27, and the upper part of the partition member 27 forms a relatively enclosed space, that is, the water inlet of the hot water outlet pipe 21 is arranged in the relatively enclosed space, reducing the influence of the cold water below the partition member 27 on the water temperature near the water inlet of the hot water outlet pipe 21, and using its heat dissipation fin function to heat the passing cold water and the water flow in the relatively enclosed space. Improve the hot water output efficiency.

[0068] The sixth embodiment of the present invention proposes a dual-tank water heater mixed hot water capacity increasing system, and on the basis of any one of the above embodiments, as Figures 1 to 4 shown, the partition member 27 is provided with a plurality of water passing holes 271.

[0069] In this embodiment, the barrier member 27 is a sheet structure, and a plurality of water holes 271 are arranged on the sheet structure to ensure that the water flows smoothly into the relatively closed space and effectively suppress the formation of water turbulence to avoid taking away part of the heat after the turbulence is formed. The diameter of the water hole 271 is between 1-4 mm. Preferably, a small round hole of about 2 mm is used as the water hole 271 for better effect.

[0070] The seventh embodiment of the present invention provides a dual-tank water heater mixed hot water capacity expansion system, and based on any of the above embodiments, as Figures 1 to 4 As shown, the water outlet liner 2 is connected to the water inlet liner 1 through a connecting pipe 3, the preheating water outlet pipe 11 is connected to the connecting pipe 3, and at least a portion of the connecting pipe 3 is wrapped with a thermal insulation layer 31.

[0071] In this embodiment, the connecting pipe 3 is arranged outside the water outlet liner 2 and the water inlet liner 1, and the preheating water inlet pipe 23 and the preheating water outlet pipe 11 are respectively connected to the connecting pipe 3. Since the connecting pipe 3 part is also prone to heat loss, an insulation layer 31 is wrapped around the outside of the connecting pipe 3 to reduce the heat loss at the position of the connecting pipe 3.

[0072] The eighth embodiment of the present invention provides a dual-tank water heater mixed hot water capacity expansion system, and based on any of the above embodiments, as Figures 1 to 4 As shown, the maximum water temperature set in the water inlet liner 1 is negatively correlated with the temperature of the cold water inlet. The lower the temperature of the cold water inlet, the higher the maximum water temperature set in the water inlet liner 1.

[0073] In this embodiment, since the temperature of the hot water entering the water outlet tank 2 is effectively reduced, the maximum water temperature that can be set in the water inlet tank 1 can also be increased accordingly, that is, the upper limit of the heating power of the water inlet tank 1 is increased, and the setting of the maximum water temperature is negatively correlated with the cold water inlet temperature. The lower the cold water inlet temperature, the higher the maximum water temperature that can be set in the water inlet tank 1. For example, when the cold water inlet temperature is 5°C, the maximum water temperature of the water inlet tank 1 can be set at about 90°C. When the cold water inlet temperature is 15°C, the maximum water temperature of the water inlet tank 1 can be set at about 85°C.

[0074] The ninth embodiment of the present invention provides a dual-tank water heater mixed hot water capacity expansion system, and based on any of the above embodiments, as Figures 1 to 4 As shown, the temperature of water input from the preheating water outlet pipe 11 to the water outlet tank 2 is no greater than 85°C.

[0075] In this embodiment, the pipe area of the preheating outlet pipe 11 arranged in the heat exchange box 12 can be designed to control the heat exchange efficiency of the first heat exchange. When the inlet water temperature is known, the maximum limit of the water temperature entering the outlet tank 2 is controlled to avoid excessive outlet water temperature.

[0076] The tenth embodiment of the present invention proposes a mixed hot water capacity-increasing system for a double-inside-tank water heater, and on the basis of any of the above embodiments, as Figures 1 to 4 shown, the water inlet tank 1 is provided with a water inlet tank heater 15 and a water inlet tank temperature detector 14, the water outlet tank 2 is provided with a water outlet tank heater 25 and a water outlet tank temperature detector 24, and the water inlet tank heater 15, the water inlet tank temperature detector 14, the water outlet tank heater 25 and the water outlet tank temperature detector 24 are all connected to the control module;

[0077] The specific heating process is as follows. After cold water enters the water inlet tank 1, the water inlet tank heater 15 heats at the rated power. As the system temperature of the water outlet tank 2 drops, the water outlet tank heater 25 starts to heat. The water outlet tank heater 25 and the water inlet tank heater 15 adopt a simultaneous heating or alternating heating method. At this time, the total power of the water outlet tank heater 25 and the water inlet tank heater 15 is guaranteed to be the rated power. When the system temperature of the water outlet tank 2 drops further, the water inlet tank heater 15 is turned off, and the water outlet tank heater 25 heats at the rated power.

[0078] In this embodiment, the water inlet tank temperature detector 14 is used to detect the real-time temperature of each detection point in the water inlet tank 1 and transmit the detection data to the control module. The water outlet tank temperature detector 24 is used to detect the real-time temperature of each detection point in the water outlet tank 2 and transmit the detection data to the control module. The control module adjusts the set temperature and heating power of the water inlet tank 1 according to the temperature of the cold water entering the water inlet tank 1, so as to avoid the hot water temperature output to the water outlet tank 2 being too high when the cold water inlet temperature in the water inlet tank 1 is relatively high, resulting in the water outlet temperature of the water outlet tank 2 exceeding the standard or malfunctioning; when using hot water, the control module turns on the water inlet tank heater 15 to heat within the shortest time after the cold water inlet enters the water inlet tank 1, ensuring a longer heating time for the entire system;

[0079] The control module is also used to allocate the power between the water outlet tank heater 25 and the water inlet tank heater 15 to ensure that the sum of their powers does not exceed the rated power of the water heater. Specifically, after cold water enters the water inlet tank 1, the water inlet tank heater 15 heats at the rated power of the water heater. As the system temperature of the water outlet tank 2 drops, the water outlet tank heater 25 starts to heat. The water outlet tank heater 25 and the water inlet tank heater 15 adopt a simultaneous heating or alternating heating method. When the water outlet tank heater 25 and the water inlet tank heater 15 heat simultaneously, the sum of the powers of the water outlet tank heater 25 and the water inlet tank heater 15 is the rated power of the water heater; when the water outlet tank heater 25 and the water inlet tank heater 15 heat alternately, the water outlet tank heater 25 and the water inlet tank heater 15 respectively heat briefly at the rated power of the water heater; when the water temperature in the water outlet tank 2 drops further, the water heater in the water outlet tank 2 heats at the rated power of the water heater to maximize the output of warm and hot water in the water outlet tank 2.

[0080] The first specific embodiment of the present invention proposes a mixed hot water capacity increasing system for a double-inside-tank water heater, as Figures 1 to 4 shown. The inlet tank heater 15 includes at least two inlet heating pipes, and the powers of several of the inlet heating pipes are arranged in an increasing trend along the direction close to the cold water inlet pipe 13;

[0081] The outlet tank heater 25 includes at least two outlet heating pipes, and the powers of several of the outlet heating pipes are arranged in an increasing trend along the direction close to the water inlet of the hot water outlet pipe 21.

[0082] In this embodiment, the inlet tank heater 15 includes an upper inlet tank heating pipe and a lower inlet tank heating pipe. The upper inlet tank heating pipe is arranged away from the cold water inlet pipe 13, and the lower inlet tank heating pipe is arranged close to the cold water inlet pipe 13. The power of the upper inlet tank heating pipe is less than that of the lower inlet tank heating pipe. For example, the power of the upper inlet tank heating pipe is 2 kW, and the power of the lower inlet tank heating pipe is 3 kW;

[0083] The outlet tank heater 25 includes an upper outlet tank heating pipe and a lower outlet tank heating pipe. The upper outlet tank heating pipe is arranged close to the water outlet of the hot water outlet pipe 21, and the lower outlet tank heating pipe is arranged away from the water outlet of the hot water outlet pipe 21. The power of the upper inlet tank heating pipe is greater than that of the lower inlet tank heating pipe. For example, the power of the upper outlet tank heating pipe is 3 kW, and the power of the lower outlet tank heating pipe is 2 kW;

[0084] When using water, as the hot water in the outlet tank 2 is output, it drives cold water into the inlet tank 1. The total power of the upper inlet tank heating pipe and the lower inlet tank heating pipe, which is 5 kW in total, is used for heating. When the water temperature at the hot water outlet pipe 21 drops to 70 °C or below, the lower outlet tank heating pipe in the outlet tank 2 starts to work instead of the upper inlet tank heating pipe, and the upper inlet tank heating pipe does not work, ensuring that the overall power remains 5 kW unchanged; when the water temperature at the hot water outlet pipe 21 reaches or is lower than 65 °C, the upper outlet tank heating pipe starts to work, the upper inlet tank heating pipe works, and other heating pipes do not work, ensuring that the total power of the system is 5 kW; after the water temperature at the hot water outlet pipe 21 is lower than 55 °C, the upper outlet tank heating pipe and the lower outlet tank heating pipe work together, and the heating pipes in the inlet tank do not work, so that the total power is still 5 kW. When heating without using water, the reverse heating sequence can be adopted for dynamic fine-tuning to ensure that the outlet tank 2 and the inlet tank 1 reach the set temperature at the fastest speed and eliminate the problem of uneven temperature field in the tank and the influence on the temperature field of other tanks, causing the temperature of adjacent tanks to exceed the standard.

[0085] In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0086] Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dual-liner water heater mixed hot water capacity-increasing system, characterized in that It includes a water inlet tank (1) and a water outlet tank (2). The water inlet tank (1) is provided with a cold water inlet pipe (13) and a preheating outlet pipe (11). Cold water enters a heat exchange box (12) communicated with the water inlet tank (1) through the cold water inlet pipe (13). The preheating outlet pipe (11) passes through the heat exchange box (12) and is communicated with the water outlet tank (2). The preheating outlet pipe (11) and the cold water conduct the first heat exchange in the heat exchange box (12). Among them, the first heat exchange includes the transfer of part of the heat of the water flow in the preheating outlet pipe (11) to the cold water in the heat exchange box (12).

2. The mixed hot water capacity increasing system of a double-inside-tank water heater according to claim 1, wherein The water outlet tank (2) is provided with a preheating inlet pipe (23) and a hot water outlet pipe (21). The preheating outlet pipe (11) is communicated with the preheating inlet pipe (23). The hot water outlet pipe (21) extends towards one end of the water outlet tank (2) so that the water inlet of the hot water outlet pipe (21) is far from the water outlet of the preheating inlet pipe (23). At least part of the pipe body of the hot water outlet pipe (21) is sleeved with a heat insulation member (26). The heat insulation member (26) is used to reduce the second heat exchange between the water flow in the hot water outlet pipe (21) and the water flow at one end of the water outlet tank (2) close to the preheating inlet pipe (23).

3. A mixed hot water capacity increasing system for a double-inside-tank water heater according to claim 2, characterized in that, A partition member (27) is arranged between the water outlet of the preheating inlet pipe (23) and the water inlet of the hot water outlet pipe (21). The partition member (27) is arranged perpendicular to or inclined to the water flow direction in the water outlet tank (2).

4. A hybrid hot water capacity increasing system for a double-inside-tank water heater according to claim 3, wherein, An outlet water heating pipe is arranged in the water outlet tank (2). The partition member (27) is connected to the outlet water heating pipe.

5. A dual-liner water heater mixed hot water capacity-increasing system according to claim 4, characterized in that, The partition member (27) is arranged close to the water inlet of the hot water outlet pipe (21). The partition member (27) and the inner wall of the water outlet tank (2) cooperate to form a relatively closed space near the water inlet of the hot water outlet pipe (21). The relatively closed space is used to reduce the temperature influence of the water flow outside the space on the water flow inside the space and improve the heating efficiency in the relatively closed space.

6. A hybrid hot water capacity increasing system for a double-inside-tank water heater according to claim 5, characterized in that, The partition member (27) is provided with a plurality of water passing holes (271).

7. A hybrid hot water capacity increasing system for a double-insulated water heater according to any one of claims 1 to 6, characterized in that The water outlet tank (2) is communicated with the water inlet tank (1) through a connecting pipeline (3). The preheating outlet pipe (11) is connected to the connecting pipeline (3). At least part of the connecting pipeline (3) is wrapped with a heat insulation layer (31).

8. A dual-liner water heater mixed hot water capacity increasing system according to any one of claims 1 to 6, characterized in that, The highest water temperature set in the water inlet tank (1) is negatively correlated with the temperature of the cold water inlet. The lower the temperature of the cold water inlet, the higher the highest water temperature set in the water inlet tank (1).

9. A hybrid hot water capacity increasing system for a double-insulated water heater according to any one of claims 1 to 6, characterized in that, The water inlet tank (1) is provided with a water inlet tank heater (15) and a water inlet tank temperature detector (14). The water outlet tank (2) is provided with a water outlet tank heater (25) and a water outlet tank temperature detector (24). The water inlet tank heater (15), the water inlet tank temperature detector (14), the water outlet tank heater (25) and the water outlet tank temperature detector (24) are all connected to a control module; The specific heating process includes that after cold water enters the water inlet tank (1), the water inlet tank heater (15) heats at the rated power. As the temperature of the water outlet tank (2) system drops, the water outlet tank heater (25) starts to heat. The water outlet tank heater (25) and the water inlet tank heater (15) heat simultaneously or alternately. At this time, the total power of the water outlet tank heater (25) and the water inlet tank heater (15) is guaranteed to be the rated power. When the temperature of the water outlet tank (2) system drops further, the water inlet tank heater (15) is turned off, and the water outlet tank heater (25) heats at the rated power.

10. A hybrid hot water capacity increasing system for a double-inside-tank water heater according to claim 9, characterized in that, The water inlet tank heater (15) includes at least two water inlet heating tubes, and the powers of several of the water inlet heating tubes are arranged in an increasing trend along the direction close to the cold water inlet pipe (13); The water outlet tank heater (25) includes at least two water outlet heating tubes, and the powers of several of the water outlet heating tubes are arranged in an increasing trend along the direction close to the water inlet of the hot water outlet pipe (21).

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