Water heater and method for increasing water heating capacity

Abstract

The application provides a water heater and a water heating capacity increasing method. The water heater comprises a first heating pipe group arranged adjacent to a water inlet pipe and a second heating pipe group arranged adjacent to a water outlet pipe. The first heating pipe group comprises a first electric heating pipe and a second electric heating pipe. At least part of the first electric heating pipe is arranged in a water outlet path of the water inlet pipe. At least part of the second electric heating pipe is arranged in a convection path of the water inlet pipe and forms an interception to the water convection. The second heating pipe group comprises a third electric heating pipe and a fourth electric heating pipe. At least part of the third electric heating pipe is arranged close to an output end of the water outlet pipe. At least part of the fourth electric heating pipe is arranged along a length direction of the water outlet pipe and extends towards a direction close to an input end of the water outlet pipe. The water heating capacity increasing method adopts the above water heater. The first electric heating pipe, the second electric heating pipe, the third electric heating pipe and the fourth electric heating pipe are controlled by switching. The water output quantity and the uniformity of the inner container temperature of the water heater when the inner container temperature is insufficient are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric water heaters, in particular to a water heater and a hot water capacity increasing method. BACKGROUND

[0002] With the improvement of people's living standards in recent years, people's demand for water consumption is increasing, and electric water heaters, as a convenient and fast water heater, are increasingly favored by users. According to the installation method, the electric water heater can be divided into horizontal electric water heater and vertical electric water heater.

[0003] The current horizontal electric water heater has the disadvantage of insufficient hot water output, especially when the inner container is too long, the temperature dead angle is too large, which causes insufficient energy storage of the water heater, affecting the overall hot water output. Especially for small capacity instant volume type water heaters, the low temperature dead angle temperature zone is too large, which easily causes insufficient energy storage of the entire inner container, and mixing 40℃ bathing water will significantly reduce it. In order to improve the output of mixed 40℃ bathing water, the method of increasing the set temperature is generally adopted, but for frequent heating caused by small capacity water, the temperature at the top of the water heater will accumulate heat, causing the hot water temperature to exceed the standard, and also causing the thermal circuit breaker to malfunction, affecting the safe use of the entire water heater.

[0004] The existing Chinese patent with publication number CN115031410A proposes a hot water capacity increasing structure and method, which can better solve the above problems, but due to the poor thermal conductivity of water, it still has the problem of insufficient water temperature rising speed, and it is difficult to ensure the hot water output when the water temperature in the inner container of the water heater is not high, which leads to the fact that the heat of the electric heating tube of the water heater cannot be effectively output, and the effective hot water output is insufficient; and the temperature gradient of the temperature field around the electric heating tube is high, and the temperature uniformity of the inner container is poor, which not only leads to the intensification of scaling, but also causes the service life of the electric heating tube to decrease. SUMMARY

[0005] The present application aims to at least solve one of the technical problems in the prior art that the water temperature rising speed is insufficient, and it is difficult to ensure the hot water output when the water temperature in the inner container of the water heater is not high, which leads to the fact that the heat of the electric heating tube of the water heater cannot be effectively output, and the effective hot water output is insufficient; and the temperature gradient of the temperature field around the electric heating tube is high, and the temperature uniformity of the inner container is poor, which not only leads to the intensification of scaling, but also causes the service life of the electric heating tube to decrease.

[0006] Therefore, in one aspect, the present application provides a water heater.

[0007] In another aspect, the present application provides a hot water capacity increasing method.

[0008] The present application provides a water heater, which comprises a water inlet pipe, a water outlet pipe, a first heating tube group arranged adjacent to the water inlet pipe, and a second heating tube group arranged adjacent to the water outlet pipe.

[0009] The first heating element assembly includes a first heating element and a second heating element. At least a portion of the first heating element is arranged in the outlet path of the inlet pipe. At least a portion of the second heating element is arranged in the convection path of the inlet water and intercepts the convection of the inlet water.

[0010] The second heating element assembly includes a third heating element and a fourth heating element. At least a portion of the third heating element is close to the output end of the water outlet pipe, and at least a portion of the fourth heating element is arranged along the length of the water outlet pipe and extends toward the input end of the water outlet pipe.

[0011] The present invention proposes a water heater in which water enters through the inlet end of the inlet pipe and then enters the inner tank through the outlet end of the inlet pipe. Water inside the inner tank flows through the inlet end of the outlet pipe and then flows out through the outlet end of the outlet pipe for user use. The arrangement of the inlet and outlet pipes is not limited and can be any of the existing inlet or outlet pipe forms. As an example, the inlet and outlet pipes are located on both sides of the inner tank of the water heater, and the outlet end of the inlet pipe includes several water outlets arranged circumferentially along the inlet pipe. The first heating element group is mainly used for centralized heating of the water flow near the inlet pipe, and the second heating element group is mainly used for centralized heating of the water flow near the outlet pipe. Specifically, the first heating element is used for centralized heating of the water flow near the outlet end of the inlet pipe. The outlet path of the inlet pipe is the path in which cold water exits through the inlet pipe. The outlet direction of the inlet pipe can be multiple, and can face multiple directions simultaneously, as long as the position of the first heating element can heat the cold water entering the inner tank through the inlet pipe. That is, most of the cold water exiting the inlet pipe will first flow through the first heating element. When the first heating element is turned on, the cold water will wash the surface of the first heating element for heat exchange. The second heating element is used for heating the water flow near the outlet pipe. The water flow along the flow path is intercepted and heated. Research has shown that water flows from the inlet end of the inlet pipe to the outlet end of the outlet pipe; this process is called inlet convection. The inlet convection path refers to the flow from the outlet end of the inlet pipe to the inlet end of the outlet pipe. Due to the fluidity of water, this convection path does not refer to a specific actual path but should be understood as the directional trend of water flow. The second heating element intercepts the inlet convection; this interception is not complete but rather ensures sufficient contact between the water flow and the second heating element. By combining the heat conduction process of the second heating element with the direction of water flow, heat transfer efficiency is further improved, thereby increasing the hot water output rate. The third heating element is used to centrally heat the water flow near the outlet end of the outlet pipe, and the fourth heating element is used to centrally heat the water flow near the inlet end of the outlet pipe and the water flow inside the outlet pipe. Since the inlet convection flows towards the inlet end of the outlet pipe, the fourth heating element is also on the inlet convection path, further improving heating efficiency. By switching the four heating elements on and off, the temperature distribution inside the water heater can be adjusted.

[0012] According to the water heater of the technical scheme of the present application, the following additional technical features can be further provided:

[0013] In the above technical scheme, the second electric heating tube comprises an extension section and an interception section, the extension section extends through the water inlet pipe and towards the direction close to the water outlet pipe, and the interception section is connected with the extension section and arranged on the convection path of the water inlet to intercept the convection of the water inlet.

[0014] In this technical scheme, the purpose of arranging the extension section is to make the interception section have an angle to intercept the convection of the water inlet. Since the direction of the convection of the water inlet is from the output end of the water inlet pipe to the input end of the water outlet pipe, one end of the extension section extends towards the direction close to the water outlet pipe, and the extension section can also be arranged along the water outlet path of the water inlet pipe to heat the water outlet of the water inlet pipe. The interception section and the extension section can be integrally formed, such as directly using the electric heating tube to be bent, or can be assembled and connected, etc.

[0015] In the above technical scheme, one end of the interception section is connected with the end of the extension section, and the other end of the interception section is inclined towards the direction close to the water inlet pipe.

[0016] In this technical scheme, one end of the interception section is connected with the end of the extension section close to the water outlet pipe, and the pipe body is inclined to the upper area of the water inlet pipe to form the interception effect on the convection of the water inlet.

[0017] In the above technical scheme, the first heating tube group is bent to form a first heating space, and the water inlet pipe at least partially penetrates into the first heating space; and / or the second heating tube group is bent to form a second heating space, and the water outlet pipe at least partially penetrates into the second heating space.

[0018] In this technical scheme, by bending the first heating tube group, a half-enclosing structure is formed, and the inside of the half-enclosing structure is the first heating space. The water inlet pipe penetrates through the first heating space to conveniently heat the water flow in the vicinity of the water inlet pipe. By bending the second heating tube group, a half-enclosing structure is formed, and the inside of the half-enclosing structure is the second heating space. The water inlet pipe penetrates through the second heating space to conveniently heat the water flow in the vicinity of the water outlet pipe. The first heating space and the second heating space can be simultaneously arranged or separately arranged.

[0019] In the above technical scheme, the sum of the power of the first electric heating tube and the third electric heating tube is equal to the rated power of the water heater; and / or

[0020] the sum of the power of the second electric heating tube and the fourth electric heating tube is equal to the rated power of the water heater.

[0021] Further, the power of the first electric heating tube and the fourth electric heating tube is the same; and / or

[0022] The power of the second electric heating tube and the third electric heating tube is same.

[0023] In the technical solution, when the rated power of the water heater is 5.2 kW, the power of the first electric heating tube and the fourth electric heating tube can be 3 kW, and the power of the second electric heating tube and the third electric heating tube can be 2.2 kW, so that the rated power of the water heater is always 5.2 kW when only the first electric heating tube and the fourth electric heating tube are turned on or only the second electric heating tube and the third electric heating tube are turned on; specifically, the first heating tube group and the second heating tube group are connected to two ends of the water heater respectively, and the demand for fixed wiring is not high, and a cable with a cross section of 2.5 square meters can be used for installation and connection.

[0024] In the above technical solution, a controller is further included, and the controller is connected to the first electric heating tube, the second electric heating tube, the third electric heating tube and the fourth electric heating tube respectively.

[0025] In the technical solution, the controller controls the start and stop of the first electric heating tube, the second electric heating tube, the third electric heating tube and the fourth electric heating tube respectively.

[0026] In the above technical solution, a first detection tube and a second detection tube are further included, the first detection tube and the second detection tube are connected to the controller in signal, a temperature measurement point of the first detection tube is arranged at a position close to an input end of the water outlet pipe, and a temperature measurement point of the second detection tube is arranged at a position close to an output end of the water inlet pipe.

[0027] In the technical solution, the first detection tube is arranged above the upper part of the inner container in the longitudinal direction, that is, close to the input end of the water outlet pipe, and is mainly used for detecting the temperature of the upper part of the inner container, so as to reflect the water outlet temperature state of the water outlet pipe; the second detection tube is mainly used for quickly detecting the water temperature drop caused by water inlet, so as to start the corresponding electric heating tube in time for heating.

[0028] In any of the above technical solutions, the output end of the water inlet pipe and the input end of the water outlet pipe are arranged separately in the inner container of the water heater, and the convection path of the water inlet is from the output end of the water inlet pipe to the input end of the water outlet pipe.

[0029] In the technical solution, the output end of the water inlet pipe is close to the bottom of the inner container, the input end of the water outlet pipe is close to the top of the inner container, and the water inlet pipe and the water outlet pipe are located on two sides of the inner container respectively, so as to reduce the influence of sudden cold water entering the inner container on the water outlet temperature.

[0030] The application also provides a hot water capacity increasing method, which adopts the water heater according to any one of the above technical solutions.

[0031] The first working state: when the water temperature in the water heater is in the first temperature range, the second electric heating tube and the fourth electric heating tube are started to heat, and the remaining electric heating tubes do not work.

[0032] The second working state: when the water temperature in the water heater is in the second temperature interval, the second electric heating tube and the fourth electric heating tube form a group, the first electric heating tube and the third electric heating tube form a group, and the two groups of electric heating tubes are heated alternately;

[0033] The third working state: when the water temperature in the water heater is in the third temperature interval, the first electric heating tube and the third electric heating tube are started to heat, and the remaining electric heating tubes do not work.

[0034] The temperature of the first temperature interval is less than the temperature of the second temperature interval, and the temperature of the second temperature interval is less than the temperature of the third temperature interval.

[0035] Further, when the water heater is in the second working state, as the water temperature in the inner container gradually rises in the second temperature interval, the heating time of the second electric heating tube and the fourth electric heating tube is gradually reduced, and the heating time of the first electric heating tube and the third electric heating tube is correspondingly extended.

[0036] Further, the water heater further comprises a first detection tube and a second detection tube, the first detection tube and the second detection tube are respectively connected with the controller, the temperature measurement point of the first detection tube is arranged at a position close to the input end of the water outlet pipe, and the temperature measurement point of the second detection tube is arranged at a position close to the output end of the water inlet pipe.

[0037] When the second detection tube detects that the temperature drop speed reaches a set threshold value and continuously decreases within a period of time, it is judged that the water heater is in a water use state, and the third working state of the water heater is started; when the first detection tube detects that the water temperature drops to the second temperature interval, the water heater enters the second working state; and when the first detection tube detects that the water temperature drops to the first temperature interval, the water heater enters the first working state.

[0038] As described above, due to the adoption of the above technical features, the beneficial effects of the present application are:

[0039] The water temperature rising speed is effectively improved, the hot water output amount when the temperature of the inner container of the water heater is insufficient is improved, the heating time of a small amount of warm water is reduced, the heat energy conversion rate of the electric heating tube is high, compared with the hot water capacity increasing structure and method of CN115031410A, the hot water output rate can be significantly improved, under the same power, about 10%-15% can be improved, the user experience can be improved and the use cost can be reduced, which has good economic efficiency; the electric heating tubes are heated alternately, the temperature gradient of the temperature field of the electric heating tube is reduced, the temperature uniformity of the inner container is improved by using the electric heating tube to supplement heat, and the starting speed of the heater when using water is improved.

[0040] Additional aspects and advantages of the present application will become apparent in the description that follows, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0041] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0042] Figure 1 is a sectional view of a water heater according to an embodiment of the present application;

[0043] Figure 2 is a schematic view of water flow direction and heating principle of a water heater according to an embodiment of the present application;

[0044] Figure 3 is a schematic view of structure of a first heating pipe group in a water heater according to an embodiment of the present application;

[0045] Figure 4 is a schematic view of structure of a second heating pipe group in a water heater according to an embodiment of the present application.

[0046] Correspondence between reference signs and component names in the above description is as follows: Figures 1 to 4

[0047] 1, first heating pipe group; 2, second heating pipe group; 3, water inlet pipe; 4, water outlet pipe; 5, first detection pipe; 6, second detection pipe; 7, inner container;

[0048] 11, first electric heating pipe; 12, second electric heating pipe; 13, first heating space;

[0049] 121, extension section; 122, interception section;

[0050] 21, third electric heating pipe; 22, fourth electric heating pipe; 23, second heating space;

[0051] 31, water dispersing port. DETAILED DESCRIPTION

[0052] In order to more clearly understand the above objectives, features and advantages of the present application, the present application will be further described below in details with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0053] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can be implemented in other different ways than those described herein, and therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0054] The water heater according to some embodiments of the present application will be described below with reference to Figures 1 to 4

[0055] Some embodiments of the present application provide a water heater and a water heating capacity increasing method. ​​

[0056] As Figures 1 to 4 shown in the first embodiment of the present application, a water heater is provided, comprising a water inlet pipe 3, a water outlet pipe 4, a first heating pipe group 1 arranged adjacent to the water inlet pipe 3, and a second heating pipe group 2 arranged adjacent to the water outlet pipe 4;

[0057] The first heating pipe group 1 comprises a first electric heating pipe 11 and a second electric heating pipe 12, at least part of the first electric heating pipe 11 is arranged in the water outlet path of the water inlet pipe 3; at least part of the second electric heating pipe 12 is arranged in the convection path of the water inlet and forms an interception to the water convection;

[0058] The second heating pipe group 2 comprises a third electric heating pipe 21 and a fourth electric heating pipe 22, at least part of the third electric heating pipe 21 is arranged adjacent to the output end of the water outlet pipe 4, and at least part of the fourth electric heating pipe 22 is arranged along the length direction of the water outlet pipe 4 and extends towards the direction close to the input end of the water outlet pipe 4.

[0059] The water heater provided in the embodiment, after the water inlet enters the water inlet pipe 3 through the input end of the water inlet pipe 3, the water flows into the inner container 7 through the output end of the water inlet pipe 3, the water flow in the inner container 7 of the water heater enters the water outlet pipe 4 through the input end of the water outlet pipe 4, and then flows out through the output end of the water outlet pipe 4 for user use, the arrangement of the water inlet pipe 3 and the water outlet pipe 4 is not limited, which can be various forms of existing water inlet pipe 3 or water outlet pipe 4, as an example, the water inlet pipe 3 and the water outlet pipe 4 are respectively located on both sides of the inner container 7 of the water heater, and the output end of the water inlet pipe 3 comprises a plurality of water scattering ports 31 arranged along the circumference of the water inlet pipe 3. The first heating pipe group 1 is mainly used for concentrated heating of the water flow near the water inlet pipe 3, and the second heating pipe group 2 is mainly used for concentrated heating of the water flow near the water outlet pipe 4; wherein the first electric heating pipe 11 is used for concentrated heating of the water flow near the output end of the water inlet pipe 3, the water outlet path of the water inlet pipe 3 is the path in which the direction of the cold water output by the water inlet pipe 3 is located, the water outlet direction of the water inlet pipe 3 can be multiple and can be directed to multiple directions at the same time, as long as the setting position of the first electric heating pipe 11 can heat the cold water input into the inner container 7 through the water inlet pipe 3, that is, most of the cold water output by the water inlet pipe 3 will first flow through the first electric heating pipe 11, when the first electric heating pipe 11 is turned on, the cold water will flush the surface of the first electric heating pipe 11 for heat exchange; the second electric heating pipe 12 is used for intercepting and heating the water flow in the convection path of the water inlet, as Figure 2As shown, it is found through research that water flow is from the input end of the water inlet pipe 3 to the output end of the water outlet pipe 4, which is called water inlet convection, and the water inlet convection path refers to the output end of the water inlet pipe 3 to the input end of the water outlet pipe 4, and due to the flow characteristics of water, the convection path is not a specific actual path, and should be understood as the direction trend of water flow. The second electric heating pipe 12 intercepts the water inlet convection, which should be understood as that the second electric heating pipe 12 has a certain intercepting effect on the water inlet convection but not complete interception, so that the water flow can fully contact the second electric heating pipe 12, and the heat conduction process of the second electric heating pipe 12 is combined with the flow direction of the water flow, so as to further improve the heat transfer efficiency and the hot water output rate. The third electric heating pipe 21 is used for concentrated heating of the water flow near the output end of the water outlet pipe 4, and the fourth electric heating pipe 22 is used for concentrated heating of the water flow near the input end of the water outlet pipe 4 and the water flow inside the water outlet pipe 4, and since the water inlet convection is flowing to the input end of the water outlet pipe 4, the fourth electric heating pipe 22 is also on the water inlet convection path, so that the heating efficiency can be further improved. Through the on-off control switching of the four electric heating pipes, the adjustment of the temperature field distribution inside the water heater can be realized.

[0060] The second embodiment of the present application provides a water heater, and is based on the first embodiment. Figures 1 to 4 As shown, the second electric heating pipe 12 includes an extension section 121 and an intercepting section 122, the extension section 121 extends through the water inlet pipe 3 and towards the direction close to the water outlet pipe 4, and the intercepting section 122 is connected with the extension section 121 and arranged on the water inlet convection path to intercept the water inlet convection.

[0061] In this embodiment, the purpose of arranging the extension section 121 is to make the intercepting section 122 have an angle that can intercept the water inlet convection, and since the direction of the water inlet convection is from the output end of the water inlet pipe 3 to the input end of the water outlet pipe 4, one end of the extension section 121 extends towards the direction close to the water outlet pipe 4, and at the same time, the extension section 121 can also be arranged along the water outlet path of the water inlet pipe 3 to heat the water outlet of the water inlet pipe 3; the intercepting section 122 can be integrally formed with the extension section 121, such as directly using the electric heating pipe to be bent to form, or can be assembled and connected, etc.

[0062] The third embodiment of the present application provides a water heater, and is based on any of the above embodiments. Figures 1 to 4 As shown, one end of the intercepting section 122 is connected with the end of the extension section 121, and the other end of the intercepting section 122 is inclined towards the direction close to the water inlet pipe 3.

[0063] In this embodiment, one end of the intercepting section 122 is connected with the end of the extension section 121 close to the water outlet pipe 4, and the pipe body is inclined to the area above the water inlet pipe 3 to form the intercepting effect on the water inlet convection.

[0064] The fourth embodiment of the present application provides a water heater, and based on any of the above embodiments, as shown in Figures 1 to 4 The first heating pipe group 1 is bent to form a first heating space 13, and the water inlet pipe 3 at least partially penetrates into the first heating space 13; and / or the second heating pipe group 2 is bent to form a second heating space 23, and the water outlet pipe 4 at least partially penetrates into the second heating space 23.

[0065] In this embodiment, by bending the first heating pipe group 1, a half-enclosed structure is formed, and the inside of the half-enclosed structure is the first heating space 13. The water inlet pipe 3 penetrates through the first heating space 13 to facilitate the concentrated heating of the water flow in the vicinity of the water inlet pipe 3. By bending the second heating pipe group 2, a half-enclosed structure is formed, and the inside of the half-enclosed structure is the second heating space 23. The water inlet pipe 3 penetrates through the second heating space 23 to facilitate the concentrated heating of the water flow in the vicinity of the water outlet pipe 4. The first heating space 13 and the second heating space 23 can be simultaneously provided or separately provided.

[0066] The fifth embodiment of the present application provides a water heater, and based on any of the above embodiments, as shown in Figures 1 to 4 The sum of the power of the first electric heating pipe 11 and the third electric heating pipe 21 is equal to the rated power of the water heater; and / or

[0067] The sum of the power of the second electric heating pipe 12 and the fourth electric heating pipe 22 is equal to the rated power of the water heater.

[0068] Further, the power of the first electric heating pipe 11 and the fourth electric heating pipe 22 is the same; and / or

[0069] The power of the second electric heating pipe 12 and the third electric heating pipe 21 is the same.

[0070] In this embodiment, when the rated power of the water heater is 5.2 kW, the power of the first electric heating pipe 11 and the fourth electric heating pipe 22 can be 3 kW, and the power of the second electric heating pipe 12 and the third electric heating pipe 21 can be 2.2 kW, which can ensure that when only the first electric heating pipe 11 and the fourth electric heating pipe 22 are turned on or only the second electric heating pipe 12 and the third electric heating pipe 21 are turned on, the heating power of the water heater is always maintained at the rated power of 5.2 kW; specifically, the first heating pipe group 1 and the second heating pipe group 2 are respectively connected to two ends of the water heater, and the demand for fixed wiring is not high, and a 2.5 square cable can be used for installation and connection.

[0071] The sixth embodiment of the present application provides a water heater, and based on any of the above embodiments, as shown in Figures 1 to 4 Further, a controller is connected to the first electric heating pipe 11, the second electric heating pipe 12, the third electric heating pipe 21, and the fourth electric heating pipe 22.

[0072] In this embodiment, the controller controls the starting and stopping of the first electric heating tube 11, the second electric heating tube 12, the third electric heating tube 21 and the fourth electric heating tube 22 respectively.

[0073] The seventh embodiment of the present application provides a water heater, and is based on any of the above embodiments, as shown in the figure, further comprising a first probe tube 5 and a second probe tube 6, the first probe tube 5 and the second probe tube 6 are respectively connected with the controller, the temperature measuring point of the first probe tube 5 is arranged near the input end of the outlet pipe 4, and the temperature measuring point of the second probe tube 6 is arranged near the output end of the inlet pipe 3. Figures 1 to 4

[0074] In this embodiment, the first probe tube 5 is arranged above the upper part of the inner container 7, i.e. arranged near the input end of the outlet pipe 4 in the longitudinal direction, mainly used for detecting the temperature of the upper part of the inner container 7, so as to reflect the water temperature state of the outlet pipe 4, and the second probe tube 6 is mainly used for quickly detecting the water temperature drop caused by water inflow, so as to start the corresponding electric heating tube in time for heating.

[0075] The eighth embodiment of the present application provides a water heater, and is based on any of the above embodiments, as shown in the figure, the output end of the inlet pipe 3 and the input end of the outlet pipe 4 are arranged separately in the inner container 7 of the water heater, and the convection path of the water inflow is from the output end of the inlet pipe 3 to the input end of the outlet pipe 4. Figures 1 to 4 In this embodiment, the output end of the inlet pipe 3 is near the bottom of the inner container 7, the input end of the outlet pipe 4 is near the top of the inner container 7, and the inlet pipe 3 and the outlet pipe 4 are arranged on the two sides of the inner container 7 respectively, so as to reduce the influence of the sudden inflow of cold water on the outlet water temperature.

[0076] The ninth embodiment of the present application provides a method for increasing the capacity of hot water, and uses the water heater as described in any of the above embodiments, as shown in the figure, the water heater comprises:

[0077] Figures 1 to 4

[0078] The first working state: when the water temperature in the water heater is in the first temperature interval, the second electric heating tube 12 and the fourth electric heating tube 22 are started to heat, and the remaining electric heating tubes do not work;

[0079] The second working state: when the water temperature in the water heater is in the second temperature interval, the second electric heating tube 12 and the fourth electric heating tube 22 are alternately heated with the first electric heating tube 11 and the third electric heating tube 21;

[0080] The third working state: when the water temperature in the water heater is in the third temperature interval, the first electric heating tube 11 and the third electric heating tube 21 are started to heat, and the remaining electric heating tubes do not work.

[0081] ​​​The temperature of the first temperature interval is less than the temperature of the second temperature interval, and the temperature of the second temperature interval is less than the temperature of the third temperature interval.

[0082] As an example, the first temperature interval is 40℃ or less, and when the water temperature in the inner container 7 is in the first temperature interval, it is considered to be an unsuitable use state, and the water heater needs to be heated to 40℃ in the shortest time. At this time, the water heater is in the first working state, and the second electric heating tube 12 and the fourth electric heating tube 22 are used for interception preheating and local heating near the input end of the outlet pipe 4, so that the water temperature at the input end of the outlet pipe 4 is quickly heated, and the water temperature quickly reaches an emergency use state in a short time. The second temperature interval is 40℃-60℃, and when the water temperature in the inner container 7 is in the second temperature interval, due to the poor thermal conductivity of water, the heat at the contact surface of the electric heating tube is not easy to conduct out, resulting in a high temperature gradient in the vicinity, which not only causes scaling to intensify, but also reduces the service life of the electric heating tube. At the same time, the heat cannot be effectively conducted out. At this time, the second electric heating tube 12 and the fourth electric heating tube 22 are used in an alternating heating mode with the first electric heating tube 11 and the third electric heating tube 21, i.e., the second electric heating tube 12 and the fourth electric heating tube 22 are started (the first electric heating tube 11 and the third electric heating tube 21 are not started) for a period of time, and then stopped. At the same time, the first electric heating tube 11 and the third electric heating tube 21 are started (the second electric heating tube 12 and the fourth electric heating tube 22 are not started) for a period of time, and then restarted. The second electric heating tube 12 and the fourth electric heating tube 22 are started (the first electric heating tube 11 and the third electric heating tube 21 are not started) for a period of time, and then stopped. The first electric heating tube 11 and the third electric heating tube 21 are started again (the second electric heating tube 12 and the fourth electric heating tube 22 are not started) for a period of time, and the process is repeated in this way. The water temperature in the inner container 7 is raised to the third temperature interval. The period of alternating heating can be set according to the rated power of the water heater and the actual working condition, such as fixed 5 minutes or other non-fixed intervals. More specifically, when the water temperature in the inner container 7 gradually rises in the second temperature interval, the heating time of the second electric heating tube 12 and the fourth electric heating tube 22 can be gradually reduced, and the heating time of the first electric heating tube 11 and the third electric heating tube 21 can be extended, so as to realize dynamic heating. The third temperature interval is 60℃-the heating temperature set by the water heater, and when the water temperature in the inner container 7 is in the third temperature interval, the first electric heating tube 11 and the third electric heating tube 21 are used for heating, so as to balance the uniformity of the temperature field of the water in the inner container 7, and control the temperature difference of the temperature field of the entire inner container 7 to be below 5℃, which is the best. Under the premise of ensuring emergency water output, the heat energy storage of the water in the inner container 7 of the water heater is maximized when the set temperature of the water heater is certain.

[0083] The first temperature interval, the second temperature interval and the third temperature interval can be set according to actual conditions, and temperature intervals corresponding to seasons can also be set according to seasons. For example, in summer, the first temperature interval is below 40 DEG C, the second temperature interval is 40 DEG C-50 DEG C, and the third temperature interval is 50 DEG C-the heating temperature set by the water heater; in winter, the first temperature interval is below 45 DEG C, the second temperature interval is 45 DEG C-60 DEG C, and the third temperature interval is 60 DEG C-the heating temperature set by the water heater.

[0084] In some embodiments, when the second probe pipe 6 detects that the temperature drops rapidly and continues to drop for a period of time, the water heater is judged to be in a water use state, and the third working state of the water heater is started rapidly, so as to supplement energy for the system and avoid the water outlet pipe 4 of the water heater from over-temperature, when the first probe pipe 5 detects that the water temperature drops to 60 DEG C (or other right boundary temperature value of the second temperature interval), the water heater enters the second working state, when the first probe pipe 5 detects that the water temperature drops to 45 DEG C (or other right boundary temperature value of the first temperature interval), the water heater enters the first working state, and the warm water output of the water heater is maximized.

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

[0086] Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for increasing the capacity of hot water, applied to a water heater, the water heater comprising: The water inlet pipe (3) and the water outlet pipe (4), characterized in that the water heater further comprises: a first heating pipe group (1) arranged adjacent to the water inlet pipe (3) and a second heating pipe group (2) arranged adjacent to the water outlet pipe (4); The first heating pipe group (1) comprises a first electric heating pipe (11) and a second electric heating pipe (12), at least part of the first electric heating pipe (11) is arranged in the water outlet path of the water inlet pipe (3); at least part of the second electric heating pipe (12) is arranged in the convection path of the water inlet and forms an interception to the water inlet convection; The second heating pipe group (2) comprises a third electric heating pipe (21) and a fourth electric heating pipe (22), at least part of the third electric heating pipe (21) is close to the output end of the water outlet pipe (4), and at least part of the fourth electric heating pipe (22) is arranged along the length direction of the water outlet pipe (4) and extends towards the direction close to the input end of the water outlet pipe (4); The method comprises: The first working state: when the water temperature in the water heater is in the first temperature interval, the second electric heating pipe (12) and the fourth electric heating pipe (22) are started to heat, and the rest of the electric heating pipes do not work; The second working state: when the water temperature in the water heater is in the second temperature interval, the second electric heating pipe (12) and the fourth electric heating pipe (22) form a group, the first electric heating pipe (11) and the third electric heating pipe (21) form a group, and the two groups of electric heating pipes are heated alternately; The third working state: when the water temperature in the water heater is in the third temperature interval, the first electric heating pipe (11) and the third electric heating pipe (21) are started to heat, and the rest of the electric heating pipes do not work; Wherein, the temperature of the first temperature interval is less than the temperature of the second temperature interval, and the temperature of the second temperature interval is less than the temperature of the third temperature interval; When the water heater is in the second working state, when the inner container water temperature gradually rises in the second temperature interval, gradually reduce the heating time of the second electric heating pipe (12) and the fourth electric heating pipe (22) and correspondingly prolong the heating time of the first electric heating pipe (11) and the third electric heating pipe (21).

2. The method of claim 1, wherein, The second electric heating pipe (12) comprises an extension section (121) and an interception section (122), the extension section (121) passes through the water inlet pipe (3) and extends towards the direction close to the water outlet pipe (4), and the interception section (122) is connected with the extension section (121) and arranged on the convection path of the water inlet to form an interception to the water inlet convection.

3. The method of claim 2, wherein the hot water is heated by a heat pump. One end of the interception section (122) is connected with the end of the extension section (121), and the other end of the interception section (122) is inclined towards the direction close to the water inlet pipe (3).

4. The method of claim 1, wherein, The first heating pipe group (1) is bent to form a first heating space (13), and the water inlet pipe (3) at least partially penetrates into the first heating space (13); and / or the second heating pipe group (2) is bent to form a second heating space (23), and the water outlet pipe (4) at least partially penetrates into the second heating space (23).

5. The method of claim 1, wherein, The sum of the power of the first electric heating pipe (11) and the third electric heating pipe (21) is equal to the rated power of the water heater; and / or The sum of the power of the second electric heating pipe (12) and the fourth electric heating pipe (22) is equal to the rated power of the water heater.

6. The method of claim 5, wherein the step of increasing the capacity of the hot water is performed by the step of: The first electric heating tube (11) and the fourth electric heating tube (22) have the same power; and / or The second electric heating tube (12) and the third electric heating tube (21) have the same power.

7. The method of claim 1, wherein the hot water is heated by a heat pump. The water heater further comprises a controller connected to the first electric heating tube (11), the second electric heating tube (12), the third electric heating tube (21) and the fourth electric heating tube (22) respectively.

8. The method of claim 1, wherein the hot water is heated by a heat pump. The water heater further comprises a first detection tube (5) and a second detection tube (6) connected to the controller, a temperature measuring point of the first detection tube (5) is arranged near an input end of the water outlet pipe (4), and a temperature measuring point of the second detection tube (6) is arranged near an output end of the water inlet pipe (3). When the second detection tube (6) detects that the temperature drop speed reaches a set threshold value and continuously drops in a period of time, the water heater is judged to be in a water use state, and the third working state of the water heater is started; when the first detection tube (5) detects that the water temperature drops to the second temperature interval, the water heater enters the second working state; and when the first detection tube (5) detects that the water temperature drops to the first temperature interval, the water heater enters the first working state.

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