Hybrid energy water heater

Abstract

The application discloses a mixed energy water heater, which comprises a burner, a heat exchanger, a water inlet pipe, a water outlet pipe and a control device, wherein the heat exchanger comprises a heat collecting cover and heat exchange pipes arranged on the heat collecting cover, and further comprises an auxiliary heating module, the auxiliary heating module comprises: an auxiliary heat collecting cover connected with the heat collecting cover, an inner part of the auxiliary heat collecting cover is defined with a cavity communicated with the heat collecting cover; a heat exchange coil is arranged in the cavity of the auxiliary heat collecting cover and the two ends of the heat exchange coil respectively project to the outside of the auxiliary heat collecting cover; an evaporator is connected with a refrigerant pipe; a compressor is connected between the heat exchange coil and the evaporator; an auxiliary heat exchange pipe is arranged in the cavity of the auxiliary heat collecting cover and the two ends of the auxiliary heat exchange pipe respectively project to the outside of the auxiliary heat collecting cover; and the control device controls the working states of the auxiliary heating module and the burner according to the water use state. The mixed energy water heater comprises two heating modes of gas heating and refrigerant heating by using the burner, and solves the technical problem of single water heating mode.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hot water making devices, and particularly relates to a mixed energy water heater. BACKGROUND

[0002] The existing water heater heating control is generally in the form of gas combustion and electric heating, and the control mode is relatively traditional and single.

[0003] The gas hot water heating generally has the technical problem of slow temperature rise. The water demand of domestic water is different, and the water quantity used is also different. For example, the water quantity required for hand washing and vegetable washing is small, which leads to frequent opening of the gas water heater. Moreover, the hot water waiting time is long, and the user may finish using water when the hot water is just output, which leads to poor user experience and waste of gas. The electric heating is limited by power and cannot meet the large-flow water demand.

[0004] At present, some water heaters adopt mixed energy heating. For example, a gas heating part and an electric heating part are configured in the gas water heater. When there are multiple heating modes, such as gas heating and electric heating, the switching logic is manually realized through the keys on the display panel. The switching logic can be switching between gas heating and electric heating. Alternatively, a default heating mode (gas) is set, and the default heating mode is switched back after a certain time after each key switching. SUMMARY

[0005] The present application proposes a mixed energy water heater to solve the above problems.

[0006] To achieve the above-mentioned application purposes, the present application adopts the following technical solutions:

[0007] A mixed energy water heater, comprising a burner, a heat exchanger, a water inlet pipe, a water outlet pipe and a control device, wherein the heat exchanger comprises a heat collecting cover and a heat exchange pipe arranged on the heat collecting cover, and further comprising an auxiliary heating module, the auxiliary heating module comprising:

[0008] an auxiliary heat collecting cover connected with the heat collecting cover, wherein the auxiliary heat collecting cover has a cavity in communication with the heat collecting cover;

[0009] a heat exchange coil arranged in the cavity of the auxiliary heat collecting cover and having two ends respectively protruding to the outside of the auxiliary heat collecting cover for connecting a refrigerant pipe;

[0010] an evaporator connected with the refrigerant pipe;

[0011] a compressor connected between the heat exchange coil and the evaporator;

[0012] An auxiliary heat exchange pipe is arranged in the cavity of the auxiliary heat collecting cover, and two ends of the auxiliary heat exchange pipe respectively protrude to the outside of the auxiliary heat collecting cover, one end of the auxiliary heat exchange pipe is connected with the heat exchange pipe;

[0013] The control device controls the working state of the auxiliary heating module and the burner according to the water use state.

[0014] Further, the auxiliary heat collecting cover is arranged above the heat collecting cover, one end of the heat exchange pipe is connected with the water inlet pipe, and the other end is connected with the auxiliary heat exchange pipe.

[0015] Further, a heat insulation layer is arranged between the auxiliary heat collecting cover and the heat collecting cover, and a through hole for connecting the auxiliary heat collecting cover and the heat collecting cover is arranged on the heat insulation layer.

[0016] Further, the mixed energy water heater further comprises an electric heating module.

[0017] Further, one end of the electric heating module is connected with the water outlet end of the auxiliary heating module, and the other end is connected with the water outlet pipe.

[0018] Further, the mixed energy water heater further comprises an anti-freezing module.

[0019] Further, the anti-freezing module comprises a first temperature detection element for detecting the temperature Td1 of the refrigerant in the auxiliary heating module and a second temperature detection element for detecting the water temperature Td2 of the water outlet end of the auxiliary heating module, and the control device controls the execution of the anti-freezing logic according to the detection results.

[0020] Further, a water pump is connected in the water inlet pipe or the water outlet pipe, the mixed energy water heater further comprises a circulation pipe for connecting the water inlet pipe and the water outlet pipe,

[0021] When Td1 and Td2 are both greater than 0℃, the circulation pipe is controlled to connect the water inlet pipe and the water outlet pipe, and the water pump is started;

[0022] When Td1 or Td2 is less than 0℃, the auxiliary heating module works;

[0023] When Td1 or Td2 is less than 0℃, and the water temperature in the water outlet pipe is less than 0℃, the burner is controlled to be ignited and burned.

[0024] Further, when it is detected that the water is turned on, the set temperature Tse is detected, and the control device selects a heating mode according to the set temperature Tse, the heating mode comprising any combination of gas heating, electric heating and auxiliary heating module heating.

[0025] Further, when Tse>T1, the gas heating is started;

[0026] When T2 < Tse ≤ T1, start the gas heating and auxiliary heating module heating;

[0027] When Tj < Tse ≤ T2, start the electric heating;

[0028] Wherein, Tj is the inlet water temperature, T1 > T2 > 0.

[0029] Compared with the prior art, the advantages and positive effects of the present application are: the mixed energy water heater of the present application, including using the burner for gas heating and refrigerant heating two heating modes, solves the technical problem of single existing heating water mode.

[0030] Other features and advantages of the present application will become more apparent after reading the detailed description of the application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0032] Figure 1 is a structural schematic diagram of an embodiment of the mixed energy water heater proposed by the present application;

[0033] Figure 2 is Figure 1 control flow chart of the mixed energy water heater. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in conjunction with the drawings and embodiments.

[0035] The present embodiment proposes a mixed energy water heater, as shown in Figure 1 The burner 11, the heat exchanger 12, the inlet water pipe 13, the outlet water pipe 14 and the control device 15, the heat exchanger 12 includes the heat collecting cover 121 and the heat exchange pipe 122 arranged on the heat collecting cover 121, and further includes the auxiliary heating module, the auxiliary heating module includes the auxiliary heat collecting cover 161, the heat exchange coil 162 and the external circulation system (not shown in the figure), the external circulation system includes the evaporator, the compressor and the valve connected in the refrigerant pipeline. The compressor can drive the refrigerant to circulate between the evaporator and the heat exchange coil 162, and the refrigerant carries heat and releases heat in the heat exchange coil 162 for heating.

[0036] The auxiliary heat collecting cover 161 is connected with the heat collecting cover 121, and the inside of the auxiliary heat collecting cover 161 is defined as a cavity which is communicated with the heat collecting cover 121; the heat exchanging coil 162 is arranged in the cavity of the auxiliary heat collecting cover 161, and the two ends of the heat exchanging coil 162 respectively project to the outside of the auxiliary heat collecting cover 161 for connecting the refrigerant pipe. The evaporator is connected with the refrigerant pipe, and the compressor is connected between the heat exchanging coil and the evaporator. Therefore, the refrigerant can absorb heat in the evaporator under the driving of the compressor, and release the heat in the heat exchanging coil 162 when circulating through the refrigerant pipe, for heating water.

[0037] The auxiliary heat exchanging pipe 163 is arranged in the cavity of the auxiliary heat collecting cover 161, and the two ends of the auxiliary heat exchanging pipe 163 respectively project to the outside of the auxiliary heat collecting cover 161, and one end of the auxiliary heat exchanging pipe 163 is connected with the heat exchanging pipe. The auxiliary heat exchanging pipe 163 and the heat exchanging pipe 122 are used for passing water flow. According to the water flow direction, the auxiliary heat exchanging pipe 163 can be arranged upstream, and the heat exchanging pipe 122 is arranged downstream, or the heat exchanging pipe 122 is arranged upstream, and the auxiliary heat exchanging pipe 163 is arranged downstream. In this embodiment, the heat exchanging pipe 122 is arranged upstream, and the auxiliary heat exchanging pipe 163 is arranged downstream.

[0038] When the burner 11 is started, the heat generated by the combustion is gathered in the heat collecting cover 121, and the heat exchanging pipe 122 is arranged on the heat collecting cover 121, so that the cold water entering from the water inlet pipe 13 can absorb heat and increase the temperature when flowing through the heat exchanging pipe 122.

[0039] When the auxiliary heating module is started for heating, the refrigerant releases heat into the auxiliary heat collecting cover 161 when circulating in the heat exchanging coil 162, and the auxiliary heat exchanging pipe 163 is arranged in the auxiliary heat collecting cover 161, so that the cold water entering from the water inlet pipe 13 can absorb the heat released by the heat exchanging coil 162 in the auxiliary heat exchanging pipe 163 after flowing through the heat exchanging pipe 122, and increase the temperature.

[0040] The control device 15 controls the working state of the auxiliary heating module and the burner according to the water use state, that is, controls the starting or stopping of the auxiliary heating module according to whether the water use is started, and controls the starting or stopping of the burner 11.

[0041] The water use state is to detect whether the water use terminal starts to use water, and the detection method has various methods, for example, the water flow flowing through the water heater can be detected, and when any water use point starts to use water (in this embodiment, starting to use water means that the water use point has the demand for hot water, and if the water use point only starts to use cold water, it does not belong to the water use state of this embodiment, because when only cold water is started, the water flow does not flow through the water heater), the water flow flows through the water heater, and the water flow flowing through the water heater can be detected to determine the water use state.

[0042] The water use state can also be detected by detecting the starting state of each water use point, and the starting state of each water use point is transmitted to the water heater through wired communication or wireless communication.

[0043] The auxiliary heat collecting cover 161 is preferably arranged above the heat collecting cover 121, one end of the heat exchange pipe 122 is connected with the water inlet pipe 13, and the other end is connected with the auxiliary heat exchange pipe 163.

[0044] In the embodiment, the auxiliary heating module and the heat exchanger 12 can be separately started to heat, or can be simultaneously started to heat.

[0045] The auxiliary heat collecting cover 161 is arranged above the heat collecting cover 121, the heat collecting cover 121 is arranged above the burner 11, the upper end of the auxiliary heat collecting cover 161 is connected with the smoke collecting cover 18, and the flue gas generated by the combustion of the burner 11 enters the smoke collecting cover 18 in sequence through the heat collecting cover 121 and the auxiliary heat collecting cover 161, and is then discharged to the outdoor through the flue gas discharge pipe (not shown in the figure) connected with the smoke collecting cover 18.

[0046] The auxiliary heating module achieves the purpose of heating through the circulation of refrigerant, and this heating method has the advantage of precise temperature control. When the ambient temperature is disturbed, the heating temperature can be accurately controlled. In order to reduce the influence of the flue gas with heat entering the auxiliary heat collecting cover 161 from the heat collecting cover 121 on the temperature in the auxiliary heat collecting cover 161, and to improve the temperature control precision of the auxiliary heating module, a heat insulation layer 17 is arranged between the auxiliary heat collecting cover 161 and the heat collecting cover 121 in the embodiment, a through hole (not shown in the figure due to the angle) for communicating the auxiliary heat collecting cover 161 and the heat collecting cover 121 is formed in the heat insulation layer 17, the heat insulation layer 17 is used to block the transmission of heat to the auxiliary heat collecting cover 161 above, to reduce the disturbance to the temperature in the auxiliary heat collecting cover 161, and to further improve the temperature control precision of the auxiliary heating module.

[0047] The through hole of the heat collecting cover 121 is used for passing the flue gas generated by combustion.

[0048] In order to further increase the types of energy sources of the water heater, the preferred hybrid energy water heater further comprises an electric heating module 19, which uses the principle of electric heating to electrically heat the water flowing therethrough.

[0049] In the embodiment, the electric heating module 19 is preferably arranged downstream of the heat exchange pipe 122 and the auxiliary heating module. When the water flowing into the electric heating module 19 does not reach the target heating temperature, the electric heating module 19 can heat the water inlet to reach the target heating temperature.

[0050] In the embodiment, the electric heating module 19 is preferably arranged downstream of the auxiliary heating module, one end of the electric heating module is connected with the water outlet end of the auxiliary heating module, and the other end is connected with the water outlet pipe.

[0051] When used in winter, the water in the water pipe is easy to freeze due to the low ambient temperature, which causes the water heater to be unable to use. The hybrid energy water heater in the embodiment further comprises an anti-freezing module.

[0052] The anti-freezing module comprises a first temperature detecting element 20 for detecting the temperature Td1 of the refrigerant in the auxiliary heating module and a second temperature detecting element 21 for detecting the water temperature Td2 at the outlet of the auxiliary heating module, and the control device 15 controls the execution of the anti-freezing logic according to the detection results.

[0053] The water pump 22 is connected to the inlet pipe 13 or the outlet pipe 14, and the hybrid energy water heater further comprises a circulation pipe for connecting the inlet pipe 13 and the outlet pipe 14, and the anti-freezing logic comprises the following steps:

[0054] When both Td1 and Td2 are greater than 0℃, the control device controls the circulation pipe to connect the inlet pipe 13 and the outlet pipe 14, and the water pump 22 is started. At this time, the temperature in the water pipe is not particularly low, and the water in the water pipe is only circulated to play the role of anti-freezing.

[0055] When either Td1 or Td2 is less than 0℃, the auxiliary heating module is operated, and when both Td1 and Td2 are greater than 10℃, the operation is stopped.

[0056] When either Td1 or Td2 is less than 0℃, and the water temperature in the outlet pipe 14 is less than 0℃, the control device controls the burner 11 to ignite and burn, and when both Td1 and Td2 are greater than 10℃, the operation is stopped.

[0057] When either Td1 or Td2 is less than 0℃, and Tc is less than 0℃, the proportional valve is opened to ignite and burn, and when Tc is greater than 20℃, the burning is stopped. At this time, the water temperature in the water pipe is relatively low, and the gas heating module is started to rapidly heat.

[0058] When the use of water is detected, the set temperature Tse is detected, and the control device selects the heating mode according to the set temperature Tse, and the heating mode comprises any combination of the gas heating, the electric heating and the auxiliary heating module heating.

[0059] When the use of water is detected, the control module of the water heater automatically selects the appropriate heating mode according to the set temperature Tse, and the heating mode matches the set temperature Tse.

[0060] Specifically, the gas heating, the electric heating and the auxiliary heating module heating have different characteristics according to different energy sources and different corresponding heating principles. For example, the gas heating has the technical problem of slow temperature rise, but the efficiency of the gas heating is high and can continuously output high-temperature water with large flow. For another example, the electric heating has fast temperature rise and fast hot water output, but the heating efficiency is low and cannot continuously output high-temperature water with large flow. Therefore, the hybrid heating control method of the embodiment detects the use of water and automatically selects and switches the heating mode according to the use of water and the set temperature, which brings great convenience to the user.

[0061] The water heater of the embodiment integrates an electric heating module and an auxiliary heating module on the basis of the structure of a conventional water heater. The electric heating module comprises a water tank and an electric heating module. The auxiliary heating module comprises an auxiliary heat exchanger, a coil and a compressor module. The heating principle of the auxiliary heating module is that the refrigerant in the refrigerant pipeline is circulated by the compressor, the refrigerant absorbs heat from the outside and is transferred to the water heater to release heat for heating water.

[0062] The internal basic water circuit of the water heater circulates. The tap water of a user is connected to the water heater through a water inlet pipe, flows into the internal copper pipe pipeline through a water pump and a water regulating valve in sequence.

[0063] The electric heating module, the auxiliary heating module and the gas heating module in the embodiment can be arranged in any order according to the water flow direction. In the embodiment, the gas heating module, the auxiliary heating module and the electric heating module are arranged in sequence according to the water flow direction.

[0064] The water inlet flow from the tap water pipe flows through the heat exchange pipe of the gas heating module, then flows through the heat exchange coil of the auxiliary heating module, then enters the water tank of the electric heating module, the electric heating module is arranged in the water tank, and finally flows out through the water outlet pipe.

[0065] The internal basic gas circuit of the water heater is consistent with that of a conventional gas water heater. The gas passes through a gas inlet joint, passes through a proportional valve and a distributor to a combustion module, is ignited by an ignition needle, the gas generated by combustion is discharged by a direct current fan and collected by a smoke hood, and is discharged to the outside through a flue.

[0066] As a preferred embodiment, as shown in Figure 2 The method for selecting the heating mode according to the set temperature Tse in the embodiment is as follows:

[0067] When Tse > T1, the gas heating is started;

[0068] When T2 < Tse ≤ T1, the gas heating and the auxiliary heating module heating are started;

[0069] When Tj < Tse ≤ T2, the electric heating is started;

[0070] Wherein, Tj is the inlet water temperature, T1 > T2 > 0.

[0071] T1 can be a relatively high temperature, for example, T1 can be 50℃, but is not limited to 50℃. When the set temperature Tse > T1, it indicates that the user has a high demand for water temperature, and therefore, the gas heating module with high heating efficiency needs to be started.

[0072] When T2 < Tse ≤ T1, the gas heating module and the auxiliary heating module are started at the same time.

[0073] At this time, the number of fire rows and the opening degree of the proportional valve of the main heating module are adjusted according to the set temperature Tse, the inlet water temperature Tj, the outlet water temperature Tc, the first anti-freezing temperature Td1, the second anti-freezing temperature Td2, and the output power of the auxiliary heating module is finely adjusted to realize constant temperature control of the outlet water temperature.

[0074] The set temperature Tse is set by the user through a control panel, and is a default value when the user does not set it.

[0075] The first anti-freezing temperature Td1 is the temperature of the refrigerant in the auxiliary heating module, and the second anti-freezing temperature Td2 is the outlet water temperature of the auxiliary heating module, which are measured by temperature sensors respectively.

[0076] In order to prevent the situation that although the water flow is detected, the water flow is small due to the fact that the water point is not tightly closed or the water pressure of the pipe network fluctuates, and to avoid false heating, the embodiment preferably further includes a step of judging the ignition condition before starting the gas heating, which includes:

[0077] The water flow flowing through the water heater is detected, and when the water flow is not less than a set flow L1, the gas heating is started by ignition. Otherwise, the ignition heating step is not performed to ensure safe hot water production.

[0078] In addition, during the combustion and heating process of the gas heating module, a stop combustion condition is further included, for example, when the current A-section fire row is burning and the outlet water temperature is greater than 52℃, the combustion can be stopped.

[0079] During the user's water use process, the mixed heating control and temperature control function is started to maximize the user's water use demand and realize the use experience of rapid heating and constant temperature water flow.

[0080] When the gas heating is started, the fire row control method includes:

[0081] The fire row includes a plurality of sections according to the fire size;

[0082] The fire row that needs to be controlled is determined according to the temperature difference between the set temperature Tse and the inlet water temperature Tj, and the temperature difference between the outlet water temperature Tc and the inlet water temperature Tj.

[0083] As a preferred embodiment, the embodiment takes the fire row which includes at least A section, B section, C section and D section in order of small to large fire size as an example for description.

[0084] When Tse-Tj>T3, the temperature difference between the inlet water temperature Tj and the outlet water temperature Tc is continuously judged:

[0085] When Tc-Tj>T4, the D-section fire row is controlled to burn;

[0086] When Tc-Tj≤T4, the C-section fire row is controlled to burn;

[0087] When Tse-Tj≤T3, control the B section fire row to burn.

[0088] Wherein, T3>T4>0.

[0089] T3may take values but not limited to 30℃, T4may take values but not limited to 5℃.

[0090] The scheme can select the fire row burning according to the difference between the inlet water temperature Tj and the set temperature Tse and the difference between the outlet water temperature Tc and the inlet water temperature Tj. The greater the above two differences, the greater the fire row burning selected, so as to meet the requirement of providing sufficient heat to quickly heat the water close to the set temperature.

[0091] In the fire row control method, it further includes judging the temperature difference between the set temperature Tse and the outlet water temperature Tc. When Tse-Tc

[0092] In order to improve the heating precision and make the outlet water temperature close to the set temperature as much as possible, the embodiment further includes controlling the auxiliary heating module heating power according to the temperature difference between the set temperature Tse and the outlet water temperature Tc, so that the outlet water temperature slowly approaches the set temperature, preventing the temperature rise from being too large and not easy to control the precision, which is easy to be too high or too low. In order to solve the above problems, the smaller the temperature difference between the set temperature Tse and the outlet water temperature Tc, the smaller the output power of the auxiliary heating module is adjusted.

[0093] As a preferred embodiment, it includes:

[0094] When Tse-Tc≥T5, if Td1

[0095] When T6≤Tse-Tc

[0096] When Tse-Tc

[0097] Wherein, T5>T6>T7>0.

[0098] 0

[0099] When Tse-Tc < T7, a secondary heating constant temperature control step is further included, which controls the heating power of the auxiliary heating module according to the temperature difference between the set temperature Tse and the outlet water temperature Tc, and the greater the temperature difference between the set temperature Tse and the outlet water temperature Tc, the greater the heating power of the auxiliary heating module, and the maximum does not exceed the rated power of the auxiliary heating module.

[0100] T7 can be 1℃, but is not limited thereto, and when Tse-Tc < T7, it indicates that the outlet water temperature is particularly close to the set temperature at this time, and the gas heating module is controlled to stop burning.

[0101] The method for controlling the auxiliary heating module to perform the secondary heating constant temperature control includes:

[0102] When Tse-Tc > T8, the auxiliary heating module is controlled to increase the power to a5 times of the rated power;

[0103] When Tse-Tc > T9, the auxiliary heating module is controlled to increase the power to a6 times of the rated power;

[0104] When Tse-Tc > T10, the auxiliary heating module is controlled to increase the power to a7 times of the rated power;

[0105] When Tse-Tc > T11, the auxiliary heating module is controlled to increase the power to the rated power;

[0106] Wherein, T7 < T8 < T9 < T10 < T11;

[0107] a4 < a5 < a6 < a7 < 100%.

[0108] When Tse-Tc > T11, it indicates that the difference between the outlet water temperature and the set temperature is large, and if the water flow is large at this time, the energy consumption required for heating to the set temperature is large, and the period is long, and it is difficult to achieve in a short time. Therefore, in the embodiment, the water flow is reduced to achieve. When the water flow is reduced, the water flow temperature can be quickly raised to the target heating temperature under the condition that the energy supply is unchanged, and the user waiting time is reduced.

[0109] When the electric heating is started, the heating power of the electric heating is controlled according to the temperature difference between the set temperature Tse and the inlet water temperature Tj, and the greater the temperature difference between the set temperature Tse and the inlet water temperature Tj, the greater the heating power of the electric heating, and the maximum does not exceed the rated power of the electric heating module.

[0110] For example, when Tse-Tj > 30℃, the electric heating module works at 100% of the rated power.

[0111] When Tse-Tj> 20℃, the electric heating module works at 70% of the rated power.

[0112] When Tse-Tj> 10℃, the electric heating module works at 50% of the rated power.

[0113] When Tse-Tj> 5℃, the water temperature T2 is judged, and when Tse-Tc> 0℃, the electric heating module works at 30% of the rated power.

[0114] When Tse-Tc< 1℃, the electric heating module works at 10% of the rated power, and the electric heating constant temperature control logic is started to maintain the constant temperature requirement of the user water temperature.

[0115] During the electric heating process, when Tse-Tc< T7, the electric heating constant temperature control step is also included; the greater the temperature difference between the set temperature Tse and the water temperature Tc, the greater the heating power of the electric heating module, and the maximum does not exceed the rated power of the electric heating module.

[0116] For example, when Tse-Tc> 2℃, the electric heating module works at 30% of the rated power.

[0117] When Tse-Tc> 4℃, the electric heating module works at 50% of the rated power.

[0118] When Tse-Tc> 6℃, the electric heating module works at 70% of the rated power.

[0119] When Tse-Tc> 10℃, the electric heating module works at 100% of the rated power.

[0120] When Tse-Tc< 1℃, the electric heating module works at 10% of the rated power, and the electric heating constant temperature control logic is continuously cycled.

[0121] When the water heater is in a standby state, that is, there is no water use, the method also includes a step of anti-freezing protection to prevent the water in the water pipe from freezing and the water heater from being unable to be used due to a low ambient temperature.

[0122] When the water heater is in a standby state, that is, there is no water use, the method also includes a step of anti-freezing protection to prevent the water in the water pipe from freezing and the water heater from being unable to be used due to a low ambient temperature.

[0123] The preheating step includes: when 0< Tj< 10℃, starting the preheating function, and the electric heating module works; when Tc> 20℃, the electric heating module stops working, and the preheating function is completed.

[0124] The method also includes a rapid heating step, when 10< Tj< 20℃, the user water rapid heating function is started. Specifically, it includes:

[0125] If Tse-Tj>30℃, the auxiliary heating module works, and when Tc>25℃, the working is stopped.

[0126] If Tse-Tj<30℃, the machine keeps standby state.

[0127] When Tj>20℃, the machine keeps standby state.

[0128] The fast heating mode can further reduce the time for the user to wait for water.

[0129] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, the technical solutions recorded in the foregoing examples can still be modified by those of ordinary skill in the art, or some technical features thereof can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. A hybrid energy water heater comprising a burner, a heat exchanger, a water inlet pipe, a water outlet pipe and a control device, the heat exchanger comprising a heat collecting cover and heat exchange pipes arranged on the heat collecting cover, characterized in that, The auxiliary heating module comprises: An auxiliary heat collecting cover connected with the heat collecting cover, the interior of the auxiliary heat collecting cover being defined with a cavity in communication with the heat collecting cover; A heat exchange coil arranged in the cavity of the auxiliary heat collecting cover and having two ends respectively protruding to the exterior of the auxiliary heat collecting cover for connecting with a refrigerant pipe; An evaporator connected with the refrigerant pipe; A compressor connected between the heat exchange coil and the evaporator; An auxiliary heat exchange pipe arranged in the cavity of the auxiliary heat collecting cover and having two ends respectively protruding to the exterior of the auxiliary heat collecting cover, one end of the auxiliary heat exchange pipe being connected with the heat exchange pipe; The control device controls the working states of the auxiliary heating module and the burner according to the water using state; A heat insulation layer is arranged between the auxiliary heat collecting cover and the heat collecting cover, and a through hole for communicating the auxiliary heat collecting cover and the heat collecting cover is formed in the heat insulation layer.

2. The hybrid energy water heater of claim 1, wherein, The auxiliary heat collecting cover is arranged above the heat collecting cover; one end of the heat exchange pipe is connected with the water inlet pipe, and the other end is connected with the auxiliary heat exchange pipe.

3. The hybrid energy water heater of claim 1 or 2, wherein, The hybrid energy water heater further comprises an electric heating module.

4. The hybrid energy water heater of claim 3, wherein, One end of the electric heating module is connected with the water outlet end of the auxiliary heating module, and the other end is connected with the water outlet pipe.

5. The hybrid energy water heater of claim 1 or 2, wherein, The hybrid energy water heater further comprises an anti-freezing module.

6. The hybrid energy water heater of claim 5, wherein, The anti-freezing module comprises a first temperature detecting element for detecting the temperature Td1 of the refrigerant in the auxiliary heating module and a second temperature detecting element for detecting the water temperature Td2 of the water outlet end of the auxiliary heating module, and the control device controls the execution of the anti-freezing logic according to the detection results.

7. The hybrid energy water heater of claim 6, wherein, A water pump is connected in the water inlet pipe or the water outlet pipe, and the hybrid energy water heater further comprises a circulation pipe for connecting the water inlet pipe and the water outlet pipe, When Td1 and Td2 are both greater than 0℃, the circulation pipe is controlled to communicate the water inlet pipe and the water outlet pipe, and the water pump is started; When Td1 or Td2 is less than 0℃, the auxiliary heating module works; When Td1 or Td2 is less than 0℃, and the water temperature in the water outlet pipe is less than 0℃, the burner is controlled to be ignited and burned.

8. The hybrid energy water heater of claim 3, wherein, When it is detected that the water is turned on, the set temperature Tse is detected, and the control device selects a heating mode according to the set temperature Tse, the heating mode comprising any combination of the gas heating, the electric heating and the auxiliary heating module heating.

9. The hybrid energy water heater of claim 8, wherein, When Tse > T1, the gas heating is started; When T2 < Tse ≤ T1, the gas heating and the auxiliary heating module heating are started; When Tj < Tse ≤ T2, the electric heating is started; Wherein, Tj is the water inlet temperature, T1 > T2 > 0.

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