Phase change heat storage gas water heater and working method thereof

Abstract

The present invention relates to a phase-change heat storage gas water heater and a working method thereof. The phase-change heat storage gas water heater comprises a main unit, a phase-change heat storage device, a cold water inlet main pipe, a hot water outlet main pipe, a first switch valve and a second switch valve. When working in the phase-change hot water working mode, the first switch valve is closed, the second switch valve is opened, the cold water of the cold water inlet main pipe enters the first heat exchange pipe through the first connecting pipe, the heat stored in the phase-change material heats up the water in the first heat exchange pipe, the hot water enters the second connecting pipe, and the hot water is discharged to the outside through the second connecting pipe and the hot water outlet main pipe to provide the user. The phase-change material of the phase-change heat storage device is used to store thermal energy, and when the user needs to use hot water, the phase-change heat storage gas water heater is operated in the phase-change hot water working mode, and constant temperature water can be discharged; in addition, the heat storage capacity of the phase-change heat storage device is much stronger than that of the traditional water storage tank, the product volume is smaller, the assembly operation is more convenient, and the maintenance cost is lower.

Description

Technical Field

[0001] The present invention relates to the technical field of gas water heaters, and in particular to a phase-change heat storage type gas water heater and a working method thereof. Background Art

[0002] Gas water heaters have a large user base due to their features such as instant heating, high thermal efficiency, and fast heating speed. Generally, gas water heaters are installed in balconies or kitchens, and it takes a while for the water to be heated to the appropriate temperature, resulting in a waste of water and gas. In addition, the water temperature is unstable during use, and it is easy to experience hot and cold phenomena. Traditionally, a water storage gas water heater with a water storage function is provided with a large water storage tank, which stores the heated hot water in a heat-insulated manner. When the hot water is needed, the hot water in the water storage tank is discharged, but the water is not "living water". However, the water required to store and discharge a preset volume of hot water in the water tank of a traditional water storage gas water heater is relatively large. In addition, due to the complex piping structure and inconvenient assembly operation, it requires regular cleaning and maintenance, and the maintenance cost is high. Summary of the invention

[0003] The first technical problem solved by the present invention is to provide a phase change heat storage gas water heater, which can effectively achieve constant temperature water output without the need to store hot water in advance, while reducing the product volume, making assembly operation more convenient and maintenance cost lower.

[0004] The second technical problem solved by the present invention is to provide a working method of a phase change heat storage gas water heater, which can effectively achieve constant temperature water output without the need to store hot water in advance, while reducing the product volume, facilitating assembly operations, and reducing maintenance costs.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A phase-change heat storage type gas water heater, the phase-change heat storage type gas water heater comprising:

[0007] A main unit, wherein the main unit is provided with a first cold water inlet pipe and a first hot water outlet pipe;

[0008] A phase-change heat storage device, a cold water inlet main pipe and a hot water outlet main pipe, wherein the phase-change heat storage device comprises a shell assembly, a phase-change material, a first heat exchange tube, a first connecting tube and a second connecting tube; the first heat exchange tube is arranged inside the shell assembly, the phase-change material is filled inside the shell assembly and is located outside the first heat exchange tube, the two ends of the first heat exchange tube are respectively connected to the first connecting tube and the second connecting tube, the first connecting tube and the second connecting tube both penetrate the shell assembly and extend to the outside of the shell assembly; the first connecting tube is connected to the first cold water inlet pipe, and the first connecting tube and the first cold water inlet pipe are also connected to the cold water inlet main pipe; the second connecting tube is connected to the first hot water outlet pipe, and the second connecting tube and the first hot water outlet pipe are also connected to the hot water outlet main pipe;

[0009] A first switch valve and a second switch valve, wherein the first switch valve is arranged on the first cold water inlet pipe, and the second switch valve is arranged on the first connecting pipe.

[0010] The phase-change heat storage gas water heater of the present invention has the following beneficial effects compared with the background technology:

[0011] When the above-mentioned phase change heat storage gas water heater works in the phase change energy storage working mode, the first switch valve is opened, the second switch valve is opened, and the main unit is working. Under the power of the main unit, the water in the phase change heat storage device circulates through the first connecting pipe, the first cold water inlet pipe, the main unit, the first hot water outlet pipe, the second connecting pipe and the first heat exchange pipe. The main unit can gradually increase the water temperature. When the hot water circulates through the first heat exchange pipe, it exchanges heat with the phase change material through the first heat exchange pipe. The phase change material absorbs heat and can store thermal energy. When working in the phase change hot water working mode, the first switch valve is closed and the second switch valve is opened. The cold water of the cold water inlet main pipe enters the first heat exchange pipe through the first connecting pipe. The heat stored in the phase change material heats the water in the first heat exchange pipe. The heated hot water enters the second connecting pipe, and the hot water is discharged to the outside through the second connecting pipe and the hot water outlet main pipe to provide to the user. It can be seen that thermal energy can be stored through the phase change material of the phase change heat storage device, and when the user needs to use hot water, the phase change heat storage gas water heater can be operated in the phase change hot water working mode, which can effectively achieve constant temperature water output; in addition, the heat storage capacity of the phase change heat storage device is much stronger than that of the traditional water storage tank, the product size is smaller, the assembly operation is more convenient, and the maintenance cost is lower.

[0012] In one embodiment, the host includes a controller, the first switch valve and the second switch valve are both control switch valves, and the controller is electrically connected to the first switch valve and the second switch valve respectively. In this way, the controller of the host not only controls the operation of its own water pump, fan, burner and other devices, but also controls the operation of the first switch valve and the second switch valve, with a high degree of automation, so that there is no need to manually adjust the opening and closing states of the first switch valve and the second switch valve.

[0013] In one embodiment, the phase-change heat storage gas water heater further includes a first temperature sensor, the controller is electrically connected to the first temperature sensor, and the first temperature sensor is arranged on the second connecting pipe for obtaining water temperature information on the second connecting pipe. In this way, the first temperature sensor can obtain water temperature information on the second connecting pipe, so that in the phase-change energy storage working mode, the first temperature sensor can obtain water temperature information entering the first heat exchange pipe from the second connecting pipe, and provide the water temperature information to the controller, which decides whether to continue the phase-change energy storage working mode; similarly, in the phase-change hot water working mode, the first temperature sensor can obtain water temperature information discharged from the first heat exchange pipe to the second connecting pipe.

[0014] In one embodiment, the phase change heat storage gas water heater further includes a mixing pipe and a flow regulating valve; the flow regulating valve is electrically connected to the controller, the flow regulating valve is arranged on the mixing pipe, and the first connecting pipe is also connected to the second connecting pipe through the mixing pipe. In this way, when working in the phase change hot water working mode, a part of the cold water in the first connecting pipe can enter the first heat exchange pipe, the heat stored in the phase change material heats up the water in the first heat exchange pipe, and the heated hot water enters the second connecting pipe, and another part of the cold water in the first connecting pipe enters the second connecting pipe through the mixing pipe and mixes with the hot water discharged from the first heat exchange pipe. The flow regulating valve is used to adjust the cold water flow of the mixing pipe, so that the hot water temperature of the second connecting pipe can be adjusted, and the second connecting pipe delivers the mixed hot water to the hot water outlet main pipe, and the hot water outlet main pipe discharges the hot water to the user. In addition, when working in the phase change energy storage working mode or the ordinary hot water working mode, the flow regulating valve can be opened at any degree without limitation.

[0015] In one embodiment, the first connecting pipe is provided with a first tee, and the first connecting pipe is connected to one end of the mixing pipe through the first tee; the second connecting pipe is provided with a second tee, and the second connecting pipe is connected to the other end of the mixing pipe through the second tee. In this way, the first connecting pipe can be quickly assembled and connected to the mixing pipe through the first tee, and the second connecting pipe can be quickly assembled and connected to the mixing pipe through the second tee.

[0016] In one embodiment, the phase change thermal storage gas water heater further includes a second temperature sensor; the controller is electrically connected to the second temperature sensor; the second temperature sensor is arranged on the first cold water inlet pipe, and is used to obtain the water temperature information on the first cold water inlet pipe; the phase change thermal storage gas water heater further includes a third temperature sensor; the controller is electrically connected to the third temperature sensor; the third temperature sensor is arranged on the first hot water outlet pipe, and is used to obtain the water temperature information on the first hot water outlet pipe. In this way, when working in the phase change energy storage working mode, the first temperature sensor obtains the water temperature information entering the first heat exchange pipe from the second connecting pipe, and the second temperature sensor obtains the water temperature information entering the first cold water inlet pipe from the first connecting pipe, and obtains the water temperature difference between the two. When the water temperature difference is less than, for example, 5°C, and the water temperature information obtained by the second temperature sensor is greater than, for example, 65°C, and the set temperature of the phase change energy storage is, for example, 60°C, it indicates that the heat storage capacity of the phase change thermal storage device is sufficient and meets the requirements.

[0017] In one embodiment, the phase-change heat storage gas water heater further includes a third switch valve; the third switch valve is arranged on the first hot water outlet pipe; the third switch valve is a control switch valve, and the controller is also electrically connected to the third switch valve. Thus, when working in the phase-change energy storage working mode or the ordinary hot water working mode, the controller controls the third switch valve to open; when working in the phase-change hot water working mode, the controller controls the third switch valve to open or close, which is not limited here.

[0018] In one embodiment, the first connecting pipe, the first cold water inlet pipe and the cold water inlet main pipe are connected through a first three-way joint; the second connecting pipe, the first hot water outlet pipe and the hot water outlet main pipe are connected through a second three-way joint.

[0019] In one embodiment, the shell assembly includes an inner shell, an outer shell sleeved outside the inner shell, and a heat-insulating material filled between the inner shell and the outer shell; the first connecting pipe and the second connecting pipe both penetrate the inner shell and the outer shell and extend to the outside of the outer shell. In this way, the heat-insulating material plays a good heat-insulating role and can reduce the loss of heat stored in the phase change material to the external environment.

[0020] In one embodiment, the first heat exchange tube is an S-shaped tube, a spiral tube or a spiral tube; a plurality of heat exchange fins are arranged on the outer wall of the first heat exchange tube. In this way, the heat exchange effect between the first heat exchange tube and the phase change material is better.

[0021] The above second technical problem is solved by the following technical solution:

[0022] A method for operating a phase-change heat storage gas water heater comprises the following steps:

[0023] When working in the phase change energy storage working mode, the first switch valve is opened, the second switch valve is opened, and the host is working. Under the power of the host, the water in the phase change heat storage device circulates through the first connecting pipe, the first cold water inlet pipe, the host, the first hot water outlet pipe, the second connecting pipe and the first heat exchange pipe. The host gradually increases the water temperature to the first preset temperature. When the hot water circulates through the first heat exchange pipe, it exchanges heat with the phase change material through the first heat exchange pipe, and the phase change material absorbs heat and stores heat energy.

[0024] When working in the phase change hot water working mode, the first switch valve is closed, the second switch valve is opened, and the main unit is on standby, the cold water from the cold water inlet main pipe enters the first heat exchange tube through the first connecting pipe, the heat stored in the phase change material heats the water in the first heat exchange tube, the heated hot water enters the second connecting pipe, and the hot water is discharged to the outside through the second connecting pipe and the hot water outlet main pipe.

[0025] The working method of the phase change heat storage gas water heater described in the present invention has the following beneficial effects compared with the background technology:

[0026] The working method of the above-mentioned phase change heat storage gas water heater can store thermal energy through the phase change material of the phase change heat storage device, and when the user needs to use hot water, the phase change heat storage gas water heater can operate in the phase change hot water working mode, which can effectively achieve constant temperature water output; in addition, the heat storage capacity of the phase change heat storage device is far stronger than that of the traditional water storage tank, the product size is smaller, the assembly operation is more convenient, and the maintenance cost is lower.

[0027] In one embodiment, the working method of the phase change thermal storage gas water heater further includes the following steps:

[0028] When working in the normal hot water working mode, the first switch valve is opened, the second switch valve is closed, and the main unit is working. Under the power of the main unit, cold water enters the main unit through the cold water inlet main pipe and the first cold water inlet pipe. The main unit heats the cold water and then discharges it out through the first hot water outlet pipe and the hot water outlet main pipe.

[0029] In one embodiment, the step of operating in the phase change energy storage mode further includes the following steps:

[0030] Acquire first water temperature information on the second connecting pipe, and acquire second water temperature information on the first connecting pipe or the first cold water inlet pipe, and obtain a first temperature deviation according to the first water temperature information and the second water temperature information;

[0031] When the first temperature deviation is less than a first preset value, and the first water temperature information or the second water temperature information is not less than a second preset value, the host is controlled to switch to a standby state.

[0032] In one embodiment, the step of operating in the phase change energy storage operating mode further includes the following steps: obtaining first water temperature information on the second connecting pipe, and / or obtaining second water temperature information on the first connecting pipe or the first cold water inlet pipe;

[0033] When the first water temperature information or the second water temperature information is not less than a second preset value, the control host switches to a standby state after working for a set time.

[0034] In one embodiment, the phase-change thermal storage gas water heater comprises a water mixing pipe and a flow regulating valve; the flow regulating valve is electrically connected to the controller, the flow regulating valve is arranged on the water mixing pipe, and the first connecting pipe is also connected to the second connecting pipe through the water mixing pipe;

[0035] The working method of the phase change heat storage gas water heater also includes the following steps: when working in the phase change hot water working mode, obtaining the first water temperature information on the second connecting pipe, and adjusting the opening size of the flow regulating valve according to the first water temperature information.

[0036] In one of the embodiments, the working method of the phase change heat storage gas water heater also includes the steps of: when working in the phase change hot water working mode, obtaining first water temperature information on the second connecting pipe; if the obtained first water temperature information is not greater than a third preset value, controlling the phase change heat storage gas water heater to switch from the phase change hot water working mode to the phase change energy storage working mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is a structural schematic diagram of a phase change heat storage gas water heater according to an embodiment of the present invention when it works in a phase change hot water working mode;

[0040] Figure 2It is a structural schematic diagram of a phase change heat storage gas water heater according to an embodiment of the present invention when it works in a phase change energy storage working mode;

[0041] Figure 3 It is a structural schematic diagram of a phase-change heat storage gas water heater according to an embodiment of the present invention when it works in a normal hot water working mode;

[0042] Figure 4 It is a schematic structural diagram of a phase change thermal storage gas water heater according to another embodiment of the present invention.

[0043] Reference numerals:

[0044] 10. Host; 11. First cold water inlet pipe; 12. First hot water outlet pipe; 13. Water pump; 14. Fan; 15. Burner; 16. Heat exchanger; 161. Second heat exchange pipe; 20. Phase change heat storage device; 21. Shell assembly; 211. Inner shell; 212. Outer shell; 213. Insulation material; 22. Phase change material; 23. First heat exchange pipe; 24. First connecting pipe; 25. Second connecting pipe; 26. Heat exchange fins; 30. Cold water inlet main pipe; 40. Hot water outlet main pipe; 50. Mixing pipe; 60. Flow control valve; K1. First switch valve;

[0045] K2, second switch valve; K3, third switch valve; T1, first temperature sensor; T2, second temperature sensor; T3, third temperature sensor. DETAILED DESCRIPTION

[0046] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0047] See also Figures 1 to 3 , Figure 1 The structure diagram of the phase change heat storage gas water heater according to one embodiment of the present invention when it is working in the phase change hot water working mode is shown. Figure 2 The structure diagram of the phase change heat storage gas water heater according to one embodiment of the present invention when it works in the phase change energy storage working mode is shown. Figure 3The schematic diagram of the structure of a phase-change heat storage gas water heater according to an embodiment of the present invention when it is working in a normal hot water working mode is shown. A phase-change heat storage gas water heater according to an embodiment of the present invention includes: a main unit 10, a phase-change heat storage device 20, a cold water inlet main pipe 30, a hot water outlet main pipe 40, a first switch valve K1 and a second switch valve K2. The main unit 10 is provided with a first cold water inlet pipe 11 and a first hot water outlet pipe 12. The phase-change heat storage device 20 includes a shell assembly 21, a phase-change material 22, a first heat exchange tube 23, a first connecting tube 24 and a second connecting tube 25. The first heat exchange tube 23 is arranged inside the shell assembly 21, the phase-change material 22 is filled inside the shell assembly 21 and is located outside the first heat exchange tube 23, and the two ends of the first heat exchange tube 23 are respectively connected to the first connecting tube 24 and the second connecting tube 25. The first connecting tube 24 and the second connecting tube 25 both penetrate the shell assembly 21 and extend to the outside of the shell assembly 21. The first connecting pipe 24 is connected to the first cold water inlet pipe 11, and the first connecting pipe 24 and the first cold water inlet pipe 11 are also connected to the cold water inlet main pipe 30. The second connecting pipe 25 is connected to the first hot water outlet pipe 12, and the second connecting pipe 25 and the first hot water outlet pipe 12 are also connected to the hot water outlet main pipe 40. The first switch valve K1 is arranged on the first cold water inlet pipe 11, and the second switch valve K2 is arranged on the first connecting pipe 24.

[0048] When the above-mentioned phase change heat storage gas water heater works in the phase change energy storage working mode, the first switch valve K1 is opened, the second switch valve K2 is opened, and the main unit 10 is working. Under the power of the main unit 10, the water in the phase change heat storage device 20 circulates through the first connecting pipe 24, the first cold water inlet pipe 11, the main unit 10, the first hot water outlet pipe 12, the second connecting pipe 25 and the first heat exchange pipe 23. The main unit 10 can gradually increase the water temperature. When the hot water circulates through the first heat exchange pipe 23, the water in the first heat exchange pipe 23 is circulated. The heat is exchanged with the phase change material 22, and the phase change material 22 absorbs heat and can store thermal energy; when working in the phase change hot water working mode, the first switch valve K1 is closed, the second switch valve K2 is opened, and the cold water of the cold water inlet main pipe 30 enters the first heat exchange tube 23 through the first connecting pipe 24. The heat stored in the phase change material 22 heats the water in the first heat exchange tube 23, and the heated hot water enters the second connecting pipe 25, and the hot water is discharged to the outside through the second connecting pipe 25 and the hot water outlet main pipe 40 to provide the user. It can be seen that thermal energy can be stored by the phase change material 22 of the phase change heat storage device 20, and when the user needs to use hot water, the phase change heat storage gas water heater can be operated in the phase change hot water working mode, which can effectively achieve constant temperature water discharge; in addition, the heat storage capacity of the phase change heat storage device 20 is much stronger than that of the traditional water storage tank, the product volume is smaller, the assembly operation is more convenient, and the maintenance cost is lower.

[0049] See also Figure 3Furthermore, the phase change heat storage gas water heater also includes a normal hot water working mode. When working in the normal hot water working mode, the first switch valve K1 is opened, the second switch valve K2 is closed, and the host 10 is working. Under the power of the host 10, cold water enters the host 10 through the cold water inlet main pipe 30 and the first cold water inlet pipe 11. The host 10 heats the cold water and then discharges it to the user through the first hot water outlet pipe 12 and the hot water outlet main pipe 40.

[0050] It should be noted that the "first connecting tube 24, the second connecting tube 25" can be "a part of the first heat exchange tube 23", that is, the "first connecting tube 24, the second connecting tube 25" and the "other parts of the first heat exchange tube 23" are manufactured as one piece; it can also be an independent component separable from the "other parts of the first heat exchange tube 23", that is, the "first connecting tube 24, the second connecting tube 25" can be manufactured independently and then combined with the "other parts of the first heat exchange tube 23" into a whole.

[0051] It should be noted that the "cold water inlet main pipe 30" can be "a part of the first cold water inlet pipe 11", that is, the "cold water inlet main pipe 30" and the "other parts of the first cold water inlet pipe 11" are manufactured as one piece; it can also be an independent component that can be separated from the "other parts of the first cold water inlet pipe 11", that is, the "cold water inlet main pipe 30" can be manufactured independently and then combined with the "other parts of the first cold water inlet pipe 11" into a whole.

[0052] It should also be noted that the phase change material 22 is, for example, an organic phase change material, an inorganic phase change material, or a mixed phase change material in which an organic phase change material and an inorganic phase change material are mixed, etc., which is not limited here. The phase change temperature of the phase change material 22 is, for example, between 40°C and 80°C. Specifically, the phase change temperature of the phase change material 22 in this embodiment is, for example, 55°C, 58°C, 60°C, 62°C or 65°C. When the temperature of the phase change material 22 is higher than the phase change temperature, the phase change material 22 changes from a solid state to a liquid state or a state where solid and liquid coexist, and can store thermal energy.

[0053] See also Figures 1 to 3 In one embodiment, the host 10 includes a controller (not shown). The first switch valve K1 and the second switch valve K2 are both control switch valves. The controller is electrically connected to the first switch valve K1 and the second switch valve K2 respectively.

[0054] Specifically, the host 10 also includes a water pump 13, a fan 14, a burner 15 and a heat exchanger 16. The water pump 13, the fan 14 and the burner 15 are all electrically connected to the controller. The heat exchanger 16 is provided with a second heat exchange pipe 161, and the two ends of the second heat exchange pipe 161 are respectively connected to the first cold water inlet pipe 11 and the first hot water outlet pipe 12. In addition, the water pump 13 is arranged on the first cold water inlet pipe 11, and is used to provide power to suck water into the second heat exchange pipe 161. When the fan 14 is working, secondary air is blown into the combustion chamber, and the gas is burned by the burner 15 to provide heat to the heat exchanger 16. The heat exchanger 16 transfers the heat to the water in the second heat exchange pipe 161 to increase the water temperature, and the hot water generated by the second heat exchange pipe 161 is discharged through the first hot water outlet pipe 12.

[0055] In this way, the controller of the host 10 not only controls the operation of its own water pump 13, fan 14, burner 15 and other devices, but also controls the operation of the first switch valve K1 and the second switch valve K2, with a high degree of automation. In this way, there is no need for manual adjustment of the opening and closing states of the first switch valve K1 and the second switch valve K2.

[0056] As an optional solution, both the first switch valve K1 and the second switch valve K2 are manual switch valves, and the opening and closing states are adjusted by manual rotation.

[0057] Please refer to Figure 1 In one embodiment, the phase change heat storage gas water heater further includes a first temperature sensor T1. The controller is electrically connected to the first temperature sensor T1, and the first temperature sensor T1 is disposed on the second connecting pipe 25, and is used to obtain water temperature information on the second connecting pipe 25. In this way, the first temperature sensor T1 can obtain water temperature information on the second connecting pipe 25, so that in the phase change energy storage working mode, the first temperature sensor T1 can obtain water temperature information entering the first heat exchange pipe 23 from the second connecting pipe 25, and provide the water temperature information to the controller, which decides whether to continue the phase change energy storage working mode; similarly, in the phase change hot water working mode, the first temperature sensor T1 can obtain water temperature information discharged from the first heat exchange pipe 23 to the second connecting pipe 25.

[0058] See also Figure 4 , Figure 4The schematic diagram of the structure of a phase-change thermal storage gas water heater according to another embodiment of the present invention is shown. In one embodiment, the phase-change thermal storage gas water heater further includes a water mixing pipe 50 and a flow regulating valve 60. The flow regulating valve 60 is electrically connected to the controller, and the flow regulating valve 60 is disposed on the water mixing pipe 50. The first connecting pipe 24 is also connected to the second connecting pipe 25 through the water mixing pipe 50. In this way, when working in the phase change hot water working mode, part of the cold water in the first connecting pipe 24 can enter the first heat exchange pipe 23, and the heat stored in the phase change material 22 heats up the water in the first heat exchange pipe 23, and the heated hot water enters the second connecting pipe 25, and another part of the cold water in the first connecting pipe 24 enters the second connecting pipe 25 through the mixing pipe 50 to mix with the hot water discharged from the first heat exchange pipe 23, and the flow regulating valve 60 is used to adjust the cold water flow of the mixing pipe 50, so as to adjust the hot water temperature of the second connecting pipe 25, and the second connecting pipe 25 delivers the mixed hot water to the hot water outlet main pipe 40, and the hot water outlet main pipe 40 discharges the hot water to the user. In addition, when working in the phase change energy storage working mode or the ordinary hot water working mode, the flow regulating valve 60 can be opened at any degree without limitation.

[0059] See also Figure 4 In one embodiment, a first three-way pipe (not shown in the figure) is provided on the first connecting pipe 24, and the first connecting pipe 24 is connected to one end of the mixing pipe 50 through the first three-way pipe. A second three-way pipe (not shown in the figure) is provided on the second connecting pipe 25, and the second connecting pipe 25 is connected to the other end of the mixing pipe 50 through the second three-way pipe. In this way, the first connecting pipe 24 can be easily and quickly assembled and connected with the mixing pipe 50 through the first three-way pipe, and the second connecting pipe 25 can be easily and quickly assembled and connected with the mixing pipe 50 through the second three-way pipe. It can be understood that, as an optional solution, the first three-way pipe and the second three-way pipe can also be omitted, that is, a first through hole is provided on the pipe wall of the first connecting pipe 24, and a second through hole is provided on the pipe wall of the second connecting pipe 25, so that one end of the mixing pipe 50 is connected to the first through hole by welding, bonding, etc., and the other end of the mixing pipe 50 is connected to the second through hole.

[0060] See also Figure 1 or Figure 4In one embodiment, the phase-change thermal storage gas water heater further includes a second temperature sensor T2. The controller is electrically connected to the second temperature sensor T2. The second temperature sensor T2 is disposed on the first cold water inlet pipe 11, and is used to obtain water temperature information on the first cold water inlet pipe 11. In addition, the phase-change thermal storage gas water heater further includes a third temperature sensor T3. The controller is electrically connected to the third temperature sensor T3. The third temperature sensor T3 is disposed on the first hot water outlet pipe 12, and is used to obtain water temperature information on the first hot water outlet pipe 12. In this way, when working in the phase change energy storage working mode, the first temperature sensor T1 obtains the water temperature information entering the first heat exchange tube 23 from the second connecting pipe 25, and the second temperature sensor T2 obtains the water temperature information entering the first cold water inlet pipe 11 from the first connecting pipe 24, and the temperature difference between the two water temperatures is obtained. When the water temperature difference is less than, for example, 5°C, and the water temperature information obtained by the second temperature sensor T2 is greater than, for example, 65°C, and the set temperature of the phase change energy storage is, for example, 60°C, it indicates that the phase change heat storage device 20 has sufficient heat storage capacity and meets the requirements.

[0061] In addition, the third temperature sensor T3 obtains the temperature information of the first hot water outlet pipe 12. According to the temperature information obtained by the third temperature sensor T3, it can be determined whether the temperature of the hot water heated by the host 10 meets the requirements.

[0062] See also Figure 4 In one embodiment, the phase change heat storage gas water heater further includes a third switch valve K3. The third switch valve K3 is disposed on the first hot water outlet pipe 12. The third switch valve K3 is a control switch valve, and the controller is also electrically connected to the third switch valve K3. In this way, when working in the phase change energy storage working mode or the ordinary hot water working mode, the controller controls the third switch valve K3 to open; when working in the phase change hot water working mode, the controller controls the third switch valve K3 to open or close, which is not limited here.

[0063] See also Figure 4 In one embodiment, the first connecting pipe 24, the first cold water inlet pipe 11 and the cold water inlet main pipe 30 are connected through a first three-way joint (not shown in the figure). In addition, the second connecting pipe 25, the first hot water outlet pipe 12 and the hot water outlet main pipe 40 are connected through a second three-way joint (not shown in the figure).

[0064] See also Figure 4In one embodiment, the housing assembly 21 includes an inner housing 211, an outer housing 212 sleeved outside the inner housing 211, and a heat-insulating material 213 filled between the inner housing 211 and the outer housing 212. The first connecting pipe 24 and the second connecting pipe 25 both penetrate the inner housing 211 and the outer housing 212 and extend to the outside of the outer housing 212. In this way, the heat-insulating material 213 plays a good heat-insulating role and can reduce the loss of heat stored in the phase change material 22 to the external environment.

[0065] See also Figure 4 In one embodiment, the first heat exchange tube 23 is an S-shaped tube, a spiral tube or a spiral tube. A plurality of heat exchange fins 26 are arranged on the outer wall of the first heat exchange tube 23. In this way, the heat exchange effect between the first heat exchange tube 23 and the phase change material 22 is better. In addition, the first heat exchange tube 23 and the heat exchange fins 26 are specifically made of metal materials such as copper, aluminum, steel, etc., and can also be other heat conductive materials, which are not limited here and can be set according to actual needs.

[0066] In one embodiment, a method for operating a phase change thermal storage gas water heater using any of the above embodiments comprises the following steps:

[0067] When working in the phase change energy storage working mode, the first switch valve K1 is opened, the second switch valve K2 is opened, and the host 10 is working. Under the power of the host 10, the water in the phase change heat storage device 20 circulates through the first connecting pipe 24, the first cold water inlet pipe 11, the host 10, the first hot water outlet pipe 12, the second connecting pipe 25 and the first heat exchange pipe 23. The host 10 gradually increases the water temperature to the first preset temperature. When the hot water circulates through the first heat exchange pipe 23, it exchanges heat with the phase change material 22 through the first heat exchange pipe 23, and the phase change material 22 absorbs heat and stores thermal energy.

[0068] It should be noted that the first preset temperature is set according to actual needs and is not limited here. For example, it can be 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C, etc.

[0069] When working in the phase change hot water working mode, the first switch valve K1 is closed, the second switch valve K2 is opened, and the host 10 is in standby mode and not working. The cold water in the cold water inlet main pipe 30 enters the first heat exchange tube 23 through the first connecting pipe 24, and the heat stored in the phase change material 22 heats the water in the first heat exchange tube 23. The heated hot water enters the second connecting pipe 25, and the hot water is discharged to the outside through the second connecting pipe 25 and the hot water outlet main pipe 40.

[0070] The working method of the above-mentioned phase change heat storage gas water heater can store thermal energy through the phase change material 22 of the phase change heat storage device 20, and when the user needs to use hot water, the phase change heat storage gas water heater can operate in the phase change hot water working mode, which can effectively achieve constant temperature water output; in addition, the heat storage capacity of the phase change heat storage device 20 is much stronger than that of the traditional water storage tank, the product size is smaller, the assembly operation is more convenient, and the maintenance cost is lower.

[0071] Furthermore, the working method of the phase change heat storage gas water heater also includes the following steps: when working in the normal hot water working mode, the first switch valve K1 is opened, the second switch valve K2 is closed, and the main unit 10 is working. Under the power of the main unit 10, cold water enters the main unit 10 through the cold water inlet main pipe 30 and the first cold water inlet pipe 11. The main unit 10 heats the cold water and discharges it to the outside through the first hot water outlet pipe 12 and the hot water outlet main pipe 40.

[0072] In one embodiment, the steps of operating in the phase change energy storage operating mode also include the following steps:

[0073] Obtaining first water temperature information on the second connecting pipe 25, and obtaining second water temperature information on the first connecting pipe 24 or the first cold water inlet pipe 11, and obtaining a first temperature deviation according to the first water temperature information and the second water temperature information;

[0074] When the first temperature deviation is less than the first preset value, and the first water temperature information or the second water temperature information is not less than the second preset value, the host 10 is controlled to switch to the standby state.

[0075] It should be noted that the first preset value is, for example, 1°C, 2°C, 3°C, 4°C or 5°C, etc. The smaller the first temperature deviation is, the closer the phase change heat storage device 20 is to the endothermic saturation state. In addition, the second preset value is, for example, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C or 80°C, etc., which is not limited here.

[0076] In one embodiment, the steps of operating in the phase change energy storage operating mode also include the following steps:

[0077] Obtaining first water temperature information on the second connecting pipe 25, and / or obtaining second water temperature information on the first connecting pipe 24 or the first cold water inlet pipe 11;

[0078] When the first water temperature information or the second water temperature information is not less than the second preset value, the host 10 is controlled to switch to the standby state after working for a set time. In this way, the phase change material 22 of the phase change heat storage device 20 can be close to the heat absorption saturation state and can no longer absorb the hot water energy of the first heat exchange tube 23. The host 10 is controlled to switch to the standby state accordingly, that is, the phase change energy storage working mode is exited in time, which greatly saves energy.

[0079] It should be noted that the set time is, for example, 60S, 120S, 240S, etc.

[0080] In one embodiment, the phase change heat storage gas water heater includes a mixing water pipe 50 and a flow regulating valve 60; the flow regulating valve 60 is electrically connected to the controller, the flow regulating valve 60 is arranged on the mixing water pipe 50, and the first connecting pipe 24 is also connected to the second connecting pipe 25 through the mixing water pipe 50.

[0081] The working method of the phase-change heat storage gas water heater also includes the following steps: when working in the phase-change hot water working mode, obtaining the first water temperature information on the second connecting pipe 25, and adjusting the opening of the flow regulating valve 60 according to the first water temperature information. Specifically, when the first water temperature information is high, the opening of the flow regulating valve 60 is increased, so that the water temperature of the second connecting pipe 25 can be reduced; when the first water temperature information is low, the opening of the flow regulating valve 60 is reduced, so that the water temperature of the second connecting pipe 25 can be increased.

[0082] In this way, part of the cold water in the first connecting pipe 24 can enter the first heat exchange pipe 23, and the heat stored in the phase change material 22 heats up the water in the first heat exchange pipe 23, and the heated hot water enters the second connecting pipe 25, and another part of the cold water in the first connecting pipe 24 enters the second connecting pipe 25 through the mixing pipe 50 to mix with the hot water discharged from the first heat exchange pipe 23. According to the first water temperature information, the flow rate of the cold water in the mixing pipe 50 is adjusted by the flow regulating valve 60, so that the temperature of the hot water in the second connecting pipe 25 can be adjusted to the required temperature range, and the second connecting pipe 25 delivers the mixed hot water to the hot water outlet main pipe 40, and the hot water outlet main pipe 40 discharges the hot water to the user.

[0083] In one embodiment, the working method of the phase change heat storage gas water heater also includes the steps of: when working in the phase change hot water working mode, obtaining the first water temperature information on the second connecting pipe 25; if the obtained first water temperature information is not greater than the third preset value, controlling the phase change heat storage gas water heater to switch from the phase change hot water working mode to the phase change energy storage working mode.

[0084] It should be understood that the "cold water" in the first cold water inlet pipe 11 is not limited to only cold water being delivered to the main unit 10, and hot water can also be delivered to the main unit 10. Similarly, the "hot water" in the first hot water outlet pipe 12 is not limited to only hot water being delivered to the main unit 10, and of course, when the main unit 10 is working (especially in the start-up stage), cold water may also be delivered to the outside through the first hot water outlet pipe 12. Similarly, the cold water inlet main pipe 30 and the hot water outlet main pipe 40 are similarly understood and will not be described in detail here.

[0085] It should be noted that, in the description of one element being connected to another element, or one element being mounted on another element, it is understood that the two elements may be connected by mounting parts such as bolts, screws, pins, rivets, etc., or may be fixedly connected by clamping, welding or integrated molding. Among them, the integrated molding method may be extrusion, casting, press fitting, injection molding and other processes.

[0086] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0088] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0089] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0090] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0092] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

Claims

1. A phase change heat storage gas water heater, characterized in that: The phase-change thermal storage gas water heater comprises: A host (10), the host (10) being provided with a first cold water inlet pipe (11) and a first hot water outlet pipe (12), the host (10) comprising a controller; A phase change heat storage device (20), a cold water inlet main pipe (30) and a hot water outlet main pipe (40), wherein the phase change heat storage device (20) comprises a shell component (21), a phase change material (22), a first heat exchange tube (23), a first connecting tube (24) and a second connecting tube (25); the first heat exchange tube (23) is arranged inside the shell component (21), the phase change material (22) is filled inside the shell component (21) and is located outside the first heat exchange tube (23), and the two ends of the first heat exchange tube (23) are respectively connected to the first connecting tube (24) and the second connecting tube (25). 25), the first connecting pipe (24) and the second connecting pipe (25) both penetrate the shell component (21) and extend to the outside of the shell component (21); the first connecting pipe (24) is connected to the first cold water inlet pipe (11), and the first connecting pipe (24) and the first cold water inlet pipe (11) are also connected to the cold water inlet main pipe (30); the second connecting pipe (25) is connected to the first hot water outlet pipe (12), and the second connecting pipe (25) and the first hot water outlet pipe (12) are also connected to the hot water outlet main pipe (40); a first switch valve (K1), a second switch valve (K2) and a third switch valve (K3), wherein the first switch valve (K1) is arranged on the first cold water inlet pipe (11), and the second switch valve (K2) is arranged on the first connecting pipe (24); The first switch valve (K1) and the second switch valve (K2) are both control switch valves, the controller is electrically connected to the first switch valve (K1) and the second switch valve (K2) respectively, and the third switch valve (K3) is arranged on the first hot water outlet pipe (12); the third switch valve (K3) is a control switch valve, and the controller is also electrically connected to the third switch valve (K3); the first connecting pipe (24), the first cold water inlet pipe (11) and the cold water inlet main pipe (30) are connected via a first three-way joint; the second connecting pipe (25), the first hot water outlet pipe (12) and the hot water outlet main pipe (40) are connected via a second three-way joint.

2. The phase change thermal storage gas water heater according to claim 1, characterized in that: The phase-change heat storage gas water heater further comprises a first temperature sensor (T1), the controller is electrically connected to the first temperature sensor (T1), and the first temperature sensor (T1) is arranged on the second connecting pipe (25) for obtaining water temperature information on the second connecting pipe (25).

3. The phase change thermal storage gas water heater according to claim 2, characterized in that: The phase-change heat storage gas water heater further comprises a water mixing pipe (50) and a flow regulating valve (60); the flow regulating valve (60) is electrically connected to the controller, the flow regulating valve (60) is arranged on the water mixing pipe (50), and the first connecting pipe (24) is also connected to the second connecting pipe (25) via the water mixing pipe (50).

4. The phase change thermal storage gas water heater according to claim 3, characterized in that: The first connecting pipe (24) is provided with a first tee pipe, and the first connecting pipe (24) is connected to one end of the mixing water pipe (50) through the first tee pipe; the second connecting pipe (25) is provided with a second tee pipe, and the second connecting pipe (25) is connected to the other end of the mixing water pipe (50) through the second tee pipe.

5. The phase change thermal storage gas water heater according to claim 1, characterized in that: The phase-change heat storage gas water heater further comprises a second temperature sensor (T2); the controller is electrically connected to the second temperature sensor (T2); the second temperature sensor (T2) is arranged on the first cold water inlet pipe (11) and is used to obtain water temperature information on the first cold water inlet pipe (11); The phase-change heat storage gas water heater further comprises a third temperature sensor (T3); the controller is electrically connected to the third temperature sensor (T3); the third temperature sensor (T3) is arranged on the first hot water outlet pipe (12) and is used to obtain water temperature information on the first hot water outlet pipe (12).

6. The phase-change thermal storage gas water heater according to claim 1, characterized in that: The shell assembly (21) comprises an inner shell (211), an outer shell (212) sleeved on the outside of the inner shell (211), and a heat-insulating material (213) filled between the inner shell (211) and the outer shell (212); the first connecting pipe (24) and the second connecting pipe (25) both penetrate the inner shell (211) and the outer shell (212), and extend to the outside of the outer shell (212).

7. The phase-change thermal storage gas water heater according to any one of claims 1 to 6, characterized in that: The first heat exchange tube (23) is an S-shaped tube, a spiral tube or a coiled tube; a plurality of heat exchange fins (26) are arranged on the outer wall of the first heat exchange tube (23).

8. An operating method of a phase-change thermal storage gas water heater according to any one of claims 1 to 7, characterized in that: The steps include: When working in the phase change energy storage working mode, the first switch valve (K1) is opened, the second switch valve (K2) is opened, and the main unit (10) is working. Under the power of the main unit (10), water in the phase change heat storage device (20) circulates through the first connecting pipe (24), the first cold water inlet pipe (11), the main unit (10), the first hot water outlet pipe (12), the second connecting pipe (25) and the first heat exchange pipe (23). The main unit (10) gradually increases the water temperature to a first preset temperature. When the hot water circulates through the first heat exchange pipe (23), it exchanges heat with the phase change material (22) through the first heat exchange pipe (23). The phase change material (22) absorbs heat and stores thermal energy. When operating in the phase change hot water working mode, the first switch valve (K1) is closed, the second switch valve (K2) is opened, and the main unit (10) is in standby mode, cold water from the cold water inlet main pipe (30) enters the first heat exchange tube (23) through the first connecting pipe (24), the heat stored in the phase change material (22) heats the water in the first heat exchange tube (23), the heated hot water enters the second connecting pipe (25), and the hot water is discharged to the outside through the second connecting pipe (25) and the hot water outlet main pipe (40).

9. The operating method of the phase change thermal storage gas water heater according to claim 8, characterized in that: The working method of the phase change thermal storage gas water heater further comprises the following steps: When operating in a normal hot water operation mode, the first switch valve (K1) is opened, the second switch valve (K2) is closed, and the main unit (10) is operating. Under the power of the main unit (10), cold water enters the main unit (10) through the cold water inlet main pipe (30) and the first cold water inlet pipe (11), and the main unit (10) heats the cold water and discharges it to the outside through the first hot water outlet pipe (12) and the hot water outlet main pipe (40).

10. The operating method of the phase change thermal storage gas water heater according to claim 8, characterized in that: The steps of operating in the phase change energy storage operating mode also include the following steps: Acquiring first water temperature information on the second connecting pipe (25), and acquiring second water temperature information on the first connecting pipe (24) or the first cold water inlet pipe (11), and obtaining a first temperature deviation based on the first water temperature information and the second water temperature information; When the first temperature deviation is less than a first preset value, and the first water temperature information or the second water temperature information is not less than a second preset value, the host (10) is controlled to switch to a standby state.

11. The operating method of the phase change thermal storage gas water heater according to claim 8, characterized in that: The steps of operating in the phase change energy storage operating mode also include the following steps: Obtaining first water temperature information on the second connecting pipe (25), and / or obtaining second water temperature information on the first connecting pipe (24) or the first cold water inlet pipe (11); When the first water temperature information or the second water temperature information is not less than a second preset value, the control host (10) switches to a standby state after working for a set time.

12. The operating method of the phase change thermal storage gas water heater according to claim 8, characterized in that: The phase-change heat storage gas water heater comprises a water mixing pipe (50) and a flow regulating valve (60); the flow regulating valve (60) is electrically connected to the controller, the flow regulating valve (60) is arranged on the water mixing pipe (50), and the first connecting pipe (24) is also connected to the second connecting pipe (25) through the water mixing pipe (50); The working method of the phase-change heat storage gas water heater also includes the following steps: when working in the phase-change hot water working mode, obtaining first water temperature information on the second connecting pipe (25), and adjusting the opening size of the flow regulating valve (60) according to the first water temperature information.

13. The operating method of the phase change thermal storage gas water heater according to claim 8, characterized in that: The working method of the phase change thermal storage gas water heater further comprises the steps of: When operating in the phase change hot water working mode, first water temperature information on the second connecting pipe (25) is obtained, and if the first water temperature information obtained is not greater than a third preset value, the phase change heat storage gas water heater is controlled to switch from the phase change hot water working mode to the phase change energy storage working mode.

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