CN105588336B - Water heater and its control method - Google Patents

Abstract

The invention provides a water heater and a control method thereof. The water heater includes a heat pump heating system and an electric heating system, and the control method of the water heater includes: obtaining environmental parameters of the environment where the water heater is located; matching the environmental parameters with a plurality of preset execution conditions to obtain execution conditions matching the environmental parameters; Determine the corresponding control mode according to the matching execution conditions, and the control mode is preset with control parameters for adjusting the operating state of the heat pump heating system and/or electric heating system; adjust the heat pump heating system and the electric heating system according to the preset control parameters in the determined control mode /or the operating status of the electric heating system. Utilizing the solution of the present invention, the control mode corresponding to the environmental parameters is used to adjust the operating state of the water heater, so that the parameters can be flexibly controlled according to the specific use environment. work efficiency and reliability.

Description

Water heater and its control method

technical field

The invention relates to the field of water heaters, in particular to a water heater and a control method thereof.

Background technique

Hot water is a necessity in people's life. However, traditional water heaters (electric water heaters, gas water heaters) have the disadvantages of high energy consumption, high cost, and serious pollution, while solar water heaters are restricted by meteorological conditions.

In view of the above problems, heat pump water heaters have appeared in the prior art, which use electric energy as power to draw heat from the low-temperature side to heat domestic water for supply to users.

Heat pump water heaters can use air, water, solar energy, geothermal heat, etc. as low-temperature heat sources, among which air source heat pump water heaters have better comprehensive performance and are not restricted by the environment. The air source heat pump water heater in the prior art is mainly composed of a compressor, a heat exchanger, a fan, an insulated water tank, a water pump, a liquid storage tank, a filter, an electronic expansion valve, and an electronic automatic controller. The heat is exchanged through the air heat exchanger, and the air after the temperature is lowered is discharged by the fan. The refrigerant in the air heat exchanger absorbs heat and vaporizes and is sucked into the compressor. The compressor compresses the low-pressure working gas into a high-temperature and high-pressure gas. It is sent to the water flow heat exchanger for condensation and liquefaction. At the same time, the water in the heat preservation water tank is forced to flow through the water flow heat exchanger by the water pump to absorb heat. The condensed and liquefied refrigerant flows into the air heat exchanger again after being throttled and cooled by the expansion valve, and the heat energy in the air is continuously "pumped" to the water, so that the temperature of the water in the heat preservation water tank gradually rises. After the water temperature in the heat preservation water tank reaches the target water temperature, it can be used by users.

However, the existing air source heat pump water heater needs to be equipped with a large-capacity thermal insulation water tank, which occupies a large space and affects indoor installation. Moreover, the hot water in the thermal insulation water tank will stop flowing out after use, and it cannot continue to be used until the heat pump heats the water in the thermal insulation water tank to a certain temperature again. This way of water discharge has caused inconvenience to users who have continuous water discharge requirements.

Contents of the invention

In view of the above problems, the present invention is proposed to provide a water heater and a corresponding water heater control method that overcome the above problems or at least partially solve the above problems.

A further object of the present invention is to make the water heater meet the requirements of various usage environments.

Another further object of the present invention is to improve the heat pump cycle efficiency and service reliability of the water heater.

In particular, the present invention provides a water heater control method. Wherein the water heater is provided with a heat pump heating system and an electric heating system, the control method of the water heater includes: obtaining the environmental parameters of the environment where the water heater is located; Conditions; determine the corresponding control mode according to the matching execution conditions, and the control mode is preset with control parameters for adjusting the operating state of the heat pump heating system and/or electric heating system; adjust the heat pump heating according to the preset control parameters in the determined control mode Operating status of the system and/or electric heating system.

Optionally, the environmental parameters include: the water inlet temperature of the water heater, the ambient temperature of the environment where the water heater is located; stop state.

Optionally, each execution condition includes: a threshold range for judging parameters, and different execution conditions have different threshold ranges; the step of matching the environmental parameters with a plurality of preset execution conditions includes: presetting the inlet water temperature and the ambient temperature The set logic operation obtains the judgment parameter; the judgment parameter obtained by the operation is compared with the threshold ranges of different execution conditions, so as to determine the matching execution condition.

Optionally, the control mode includes: using one of the heat pump heating system and the electric heating system to supply water to the outside, and adjusting the operating state of the heat pump heating system and/or the electric heating system according to the preset control parameters in the alternative water supply mode Including: supplying the water heated by the heat pump heating system to the water storage tank of the electric heating system; closing the heat pump heating system after the water temperature in the water storage tank reaches the first preset temperature; receiving the external water supply start signal; The outlet pipe supplies water, and after the water temperature in the water storage tank drops to the second preset temperature, the water supply from the water storage tank is stopped, and the heat pump heating system is started, and the heat pump heating system heats the water and supplies it to the water outlet pipe of the water heater.

Optionally, the control mode includes: at least one common water supply mode in which the heat pump heating system and the electric heating system jointly supply water to the outside.

Optionally, the common water supply mode includes: a first common water supply mode, and adjusting the operating state of the heat pump heating system and/or the electric heating system according to the preset control parameters in the first common water supply mode includes: using the water heated by the heat pump heating system supply to the water storage tank of the electric heating system; after the water temperature of the water storage tank reaches the third preset temperature, the water flow pipeline and the heat pump device of the heat pump heating system are closed; the electric heater of the electric heating system heats the water temperature of the water storage tank to the third preset temperature. 4. Preset temperature; receive external water supply start signal; start the water flow pipeline of the heat pump heating system and keep the heat pump device of the heat pump heating system closed; mix the water flowing through the water flow pipeline with the water from the water storage tank and then send it to the water heater outlet pipe supply.

Optionally, the common water supply mode includes: a second common water supply mode, and adjusting the operating state of the heat pump heating system and/or the electric heating system according to the preset control parameters in the second common water supply mode includes: using the water heated by the heat pump heating system supply to the water storage tank of the electric heating system; after the water temperature of the water storage tank reaches the fifth preset temperature, the water flow pipeline and the heat pump device of the heat pump heating system are closed; and the electric heater of the electric heating system heats the water temperature of the water storage tank to The sixth preset temperature; receiving an external water supply start signal; starting the water flow pipeline of the heat pump heating system and keeping the heat pump device of the heat pump heating system closed; mixing the water flowing through the water flow pipeline with the water from the water storage tank to the The outlet pipe supply of the water heater; after the water temperature in the water storage tank drops to the seventh preset temperature, start the heat pump device of the heat pump heating system, mix the water heated by the heat pump device with the water from the water storage tank, and then supply it to the outlet pipe of the water heater .

Optionally, the common water supply mode includes: a third common water supply mode, and adjusting the operating state of the heat pump heating system and/or the electric heating system according to the preset control parameters in the third common water supply mode includes: using the water heated by the heat pump heating system supply to the water storage tank of the electric heating system; after the water temperature of the water storage tank reaches the eighth preset temperature, the water flow pipeline and the heat pump device of the heat pump heating system are closed; and the water temperature of the water storage tank is heated by the electric heater of the electric heating system to Ninth preset temperature; receive external water supply start signal; start the water flow pipeline of the heat pump heating system and keep the heat pump device of the heat pump heating system closed; mix the water flowing through the water flow pipeline with the water from the water storage tank The outlet pipe of the water heater is supplied; after the water temperature in the water storage tank drops to the tenth preset temperature, the heat pump device of the heat pump heating system is started, and the water heated by the heat pump device is mixed with the water from the water storage tank and then supplied to the outlet pipe of the water heater ; After the outlet water temperature of the outlet pipe of the water heater is lower than the user's target water temperature, start the auxiliary electric heating device located at the outlet pipe of the water heater.

Optionally, the heat pump heating system is a compressed air source heat pump heating system, including a water flow heat exchanger and an air heat exchanger, and the control modes include: defrosting mode, adjusting the heat pump heating system and /or the operating state of the electric heating system includes: switching the refrigerant flow path of the heat pump heating system to the operating state where its water flow heat exchanger is used as an evaporator and its air heat exchanger is used as a condenser; the storage of the electric heating system The water tank supplies water to the water flow pipeline of the water flow heat exchanger to absorb the cooling capacity of the water flow heat exchanger.

In particular, according to another aspect of the present invention, a water heater is also provided. The water heater includes a heat pump heating system and an electric heating system, and the water heater is configured to adjust the operating state of the heat pump heating system and/or the electric heating system by any one of the water heater control methods described above.

The water heater and the water heater control method of the present invention preset a variety of different control modes and the execution conditions of each control mode. When the water heater is in use, the environmental parameters of the environment where the water heater is located are obtained and matched with the execution conditions according to the environmental parameters, and further A control mode suitable for the current environment where the water heater is located is determined, and the operation state of the water heater is adjusted using the determined control mode. Therefore, the parameters of the water heater can be flexibly controlled according to the specific use environment. On the one hand, it meets the user's water requirements, and on the other hand, it can also improve the working efficiency and reliability of the water heater.

Further, the water heater of the present invention is equipped with a heat pump heating system and an electric heating system, and preferably adopts the heat pump heating system, makes full use of the advantages of the heat pump heating system, uses the electric heating system to cooperate with water supply, and avoids frequent start and stop of the heat pump as far as possible, prolonging the heat pump heating time. The service life of the device.

Furthermore, the multiple control modes preset in the water heater of the present invention control the heat pump heating system, the electric heating system and their components through different strategies, which meet the requirements of different use environments, and the control is flexible and reliable.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic structural view of a water heater according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a water heater control method according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of the water flow direction of the water heater in a control mode according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the water flow direction of the water heater in another control mode according to an embodiment of the present invention; and

Fig. 5 is a schematic diagram of the water flow direction of the water heater in the defrosting mode according to an embodiment of the present invention.

Detailed ways

This embodiment provides a water heater, and an appropriate control mode can be selected according to the environment. FIG. 1 is a schematic structural diagram of a water heater according to an embodiment of the present invention, the water heater is provided with a heat pump heating system 110 and an electric heating system 120 . The heat pump heating system 110 uses the heat of the heat pump cycle to heat water. The electric heating system 120 uses electric heating to heat water. In this embodiment, the water heater is preset with multiple control modes, and each control mode corresponds to its execution conditions. When using the water heater of this embodiment, the environment in which it is located satisfies different execution conditions, and the operation status of the heat pump heating system 110 and the electric heating system 120 can be adjusted automatically using the preset control parameters in the corresponding control mode.

The environmental parameters used in determining the control mode include any one or more of the following: water heater inlet temperature, ambient temperature of the water heater environment, user-set target outlet water temperature, heat pump heating temperature, and the like. Preferably, the water heater's water inlet temperature and the ambient temperature of the environment where the water heater is located can be used to determine the control mode of the water heater. The adjusted operating state of the water heater may include: the water supply direction of the heat pump heating system and/or the electric heating system, the start and stop status of the heat pump heating system and/or the electric heating system, and the water supply ratio of the heat pump heating system and the electric heating system and water supply.

In order to obtain the above environmental parameters, the water heater in this embodiment can be equipped with an inlet temperature sensor and an ambient temperature sensor, wherein the inlet temperature sensor is used to obtain the inlet water temperature of the water heater, and the ambient temperature sensor is used to obtain the ambient temperature of the environment where the water heater is located.

The heat pump heating system 110 may include: a water flow heat exchanger 111 and a heat pump device. The electric heating system includes a water storage tank 121 and an electric heater 122 for heating the water in the water storage tank. Among them, the water flow heat exchanger 111 can transfer the heat of the heat pump cycle to the water flow flowing through its water channel to complete the water heating. The electric heating system 120 is provided with a water storage tank 121 and an electric heater 122 disposed in the water storage tank 121, and the water storage tank 121 is generally in a state of full water during the water supply process.

The heating principle of the heat pump heating system 110 is to work according to the reverse Carnot cycle. The refrigerating medium performs heat exchange through the air heat exchanger 112 , absorbs heat energy from the low-temperature heat source, and the air whose temperature is lowered after exchanging with the air heat exchanger 112 is discharged by the fan 115 . The vaporized refrigerant gas is sucked into the compressor 114 through the refrigerant flow switching device 113, and the compressor 114 compresses the low-pressure refrigerant gas into a high-temperature and high-pressure gas and sends it to the water heat exchanger 111 for condensation and liquefaction. The water flowing through the water flow heat exchanger 111 is heated, and the high-pressure liquid refrigerant passes through the liquid receiver 116 and reaches the expansion valve 117 to become a low-temperature and low-pressure liquid to start the next cycle.

The water storage tank 121 is generally in a full water state during the stage of supplying water to the outside. The heat pump heating system 110 and the electric heating system 120 can both be supplied with water by the water inlet pipeline of the water heater, without setting separate water inlet pipes respectively. In an optional structure, the water heater in this embodiment can be provided with an inlet water distribution device 141 to distribute the water from the water inlet pipeline to the heat pump heating system 110 and the electric heating system 120 . The heat pump heating system 110 and the electric heating system 120 respectively receive the inflow water distributed by the inflow water distribution device 141 , heat it and then supply it to the outside. At the same time, the water inflow and outflow of the heat pump heating system 110 and the electric heating system 120 are generally the same, so the water inlet distribution device 141 determines the external water supply of the heat pump heating system 110 and the electric heating system 120 through water distribution. The water supply flow and ratio.

The water inlet distribution device 141 is respectively connected with the first water inlet and outlet of the water flow heat exchanger 111 , the first water inlet and outlet of the water storage tank 121 and the water inlet pipeline of the water heater. The water inlet distribution device 141 can be composed of a combination of valves whose openings can be controlled, or a combination valve integrating multiple ports can also be used. An optional way is: the water inlet distribution device 141 is an electronically controlled proportional valve including at least three ports, the first port A of the electronically controlled proportional valve 141 is connected to the water inlet pipeline, and the second port B of the electronically controlled proportional valve 141 It is connected with the first water inlet and outlet of the water flow heat exchanger 111 , and the third port C of the electric control proportional valve 141 is connected with the first water inlet and outlet of the water storage tank 121 . In the control mode, the control parameters for adjusting the opening degrees of the second port B and the third port C are adjusted by preset, and the water supply ratio of the heat pump heating system 110 and the electric heating system 120 can be controlled by using the control parameters accordingly, so as to ensure the water output of the water heater The temperature is stable.

In order to make the water provided by the second port B of the electronically controlled proportional valve 141 have sufficient pressure to pass through the water flow heat exchanger 111, between the second port B of the electronically controlled proportional valve 141 and the first inlet and outlet of the water flow heat exchanger 111 A water pump 142 may also be provided to increase the water pressure.

The water heater of this embodiment can be provided with a plurality of different temperature sensors to measure the water temperature everywhere. These temperature sensors include: a first temperature sensor 131 , a second temperature sensor 132 , a third temperature sensor 133 and a fourth temperature sensor 134 , Among them, the first temperature sensor 131 is used to measure the outlet water temperature of the heat pump heating system 110; the second temperature sensor 132 is used to measure the water temperature of the water heater inlet pipeline; Wherein, the first temperature sensor 131 can be set in the outlet pipe of the water flow heat exchanger 111 of the heat pump heating system 110, the second temperature sensor 132 can be set in the water inlet pipeline of the water heater, and the third temperature sensor 133 can be set in the water storage tank In 121, the fourth temperature sensor 134 is used to measure the outlet water temperature of the water heater.

In addition, the water heater in this embodiment may be provided with a water mixer 143 for mixing the water output from the water flow heat exchanger 111 and the water storage tank 121 . The water mixing device 143 can be a water mixer including at least three ports, the first port A' of the water mixer 143 is connected to the second inlet and outlet of the water flow heat exchanger 111, the second port B' of the water mixer 143 is connected to The second water inlet and outlet of the water storage tank 121 are connected, and the third port C' of the water mixer 143 is connected with the water outlet pipeline. The water mixer 143 receives the water from the first port A' and the second port B', mixes it in its water mixing chamber, and supplies it out from the third port C'. A fourth temperature sensor 144 may also be provided at the outlet of the third port C' to measure the temperature of the mixed water.

Considering that in some limit cases, such as the continuous water supply of the water heater is longer, the outlet water temperatures of the heat pump heating system 110 and the electric heating system 120 are both lower than the target outlet water temperature. The water heater of this embodiment can also be provided with an auxiliary electric heater 145, which is arranged on the water outlet pipeline and is configured to start when the outlet water temperature of the third port C' of the water mixer 143 is lower than the target outlet water temperature, so as to further increase the supply water temperature.

The water heater in this embodiment can operate in a variety of different water supply modes. In different modes, the operating parameters of the water heater are different, and the control procedures for the water heater are also different. For example, under different control modes, whether the heat pump device is started, the starting conditions, the starting and stopping conditions of the electric heater 122, the water supply direction and the water supply ratio of the water flow heat exchanger 111 and the water storage tank 121 are all different. The specific implementation manner of adjusting the running state of the water heater using the control modes under different execution conditions and the flow of determining the control mode are introduced in the following embodiments of the water heater control method.

The embodiment of the present invention also provides a water heater control method, which is used to control any water heater introduced in the above embodiments to meet the use requirements of different environments. Fig. 2 is a schematic diagram of a water heater control method according to an embodiment of the present invention, the water heater control method includes:

Step S202, acquiring environmental parameters of the environment where the water heater is located;

Step S204, matching the environmental parameters with a plurality of preset execution conditions to obtain the execution conditions matching the environmental parameters;

Step S206, determining the corresponding control mode according to the matching execution condition;

Step S208 adjusts the operating state of the heat pump heating system and/or the electric heating system according to the preset control parameters in the determined control mode.

The control parameters for adjusting the operating state of the heat pump heating system and/or the electric heating system are preset in the above control modes. The above environmental parameters can preferably be selected from the inlet water temperature of the water heater and the ambient temperature of the environment where the water heater is located; the operating conditions that need to be adjusted include the water supply direction of the heat pump heating system and/or the electric heating system and the temperature of the heat pump heating system and/or the electric heating system. Start and stop status.

The above execution conditions can be set in various ways, for example, setting threshold ranges for the inlet water temperature and the ambient temperature. Different execution conditions have different threshold ranges for the two parameters. Using the execution conditions in this way, an optional process of step S204 is to compare the acquired water inlet temperature and ambient temperature with the preset threshold ranges respectively, when the water heater acquired water inlet temperature and ambient temperature When it falls within the threshold range specified by a certain execution condition, it can be determined that the execution condition matches the current environment parameter.

Another way to set the execution condition is: set the threshold range of the judgment parameter, and the threshold range of different execution conditions is different, so the process of step S204 can be: perform a preset logical operation on the inlet water temperature and the ambient temperature to obtain a judgment Parameters; compare the judgment parameters obtained from the calculation with the threshold ranges of different execution conditions to determine the matching execution conditions. One of the relatively simple logical operation methods for judging parameters is to take the average or mean square value of the influent water temperature and the ambient temperature, and different weights can be set for weighted operations. The formulas of the preset logic operations above can be summarized based on the results of various tests, and other environmental parameters (such as the target water temperature and outdoor temperature set by the user) can also be added or decreased as the variables of the operation. It is more flexible to use logic operations to calculate the judgment parameters for threshold judgment, and the judgment basis can be flexibly modified.

An optional mode of the control method of the water heater in this embodiment can set the following control mode: use one of the heat pump heating system and the electric heating system to supply water to the outside, at least one of the heat pump heating system and the electric heating system Common water supply mode for external water supply, defrost mode for maintenance of heat pump heating system, etc. Among them, one of the water supply modes is suitable for the environment temperature in summer and the inlet water temperature is high, and the common water supply mode is suitable for the environment temperature and the inlet water temperature that cannot be satisfied by the alternative water supply mode. The water supply mode can be set to multiple, and the flow and operating conditions of the common water supply of the heat pump heating system 110 and the electric heating system 120 are adjusted. Three common water supply modes.

In a relatively hot summer environment (for example, the ambient temperature is 35 degrees), the process of controlling the water heater in step S208 using one of the water supply modes is: supply the water heated by the heat pump heating system 110 to the water storage tank 121 of the electric heating system 120 ; After the water temperature of the water storage tank 121 reaches the first preset temperature (such as about 42 degrees), turn off the heat pump heating system 110; receive the external water supply start signal (such as the action of the user opening the hot water valve or the water pressure signal); The water tank 121 supplies water to the outlet pipe of the water heater, and after the water temperature in the water storage tank 121 drops to a second preset temperature (such as about 40 degrees), the water supply from the water storage tank 121 is stopped, and the heat pump heating system 110 is started to heat the water by the heat pump heating system 110 Water is supplied to the outlet pipe of the water heater.

Fig. 3 is a schematic view of the water flow direction of the water heater in a control mode according to an embodiment of the present invention, and the figure shows the water flow direction heated by the heat pump heating system alone.

When supplying water to the water storage tank 121, the first port A and the second port B of the electronically controlled proportional valve 141, the first port A' and the second port B' of the water mixer 143 are in a full-through state, and the water pump 142 is all on. state, the third port C of the electronically controlled proportional valve 141 and the third port C' of the water mixer 143 are closed. Tap water from the outside enters the water flow heat exchanger 111 through the second port B through the water inlet pipe of the water heater, and the heat pump device is in a heat pump state to heat the water flow passing through the water flow heat exchanger 111 . The heated water enters the water storage tank 12 through the first port A' and the second port B' of the water mixer 143. , when supplying water, first, the first port A and the third port C of the electronically controlled proportional valve 141, and the second port B' and the third port C' of the water mixer 143 are opened, and water is supplied from the water storage tank 121 to the outside, When the water temperature of the water storage tank 121 drops, the heat pump heating system starts to start, the first port A and the second port B of the electronically controlled proportional valve 141, and the first port A' and the third port C' of the water mixer 143 are opened, by The water flow heat exchanger 111 supplies water to the outside.

Fig. 4 is a schematic view of the water flow direction of the water heater in another control mode according to an embodiment of the present invention. The water supply mode shown in Fig. 4 is that the heat pump heating system 110 and the electric heating system 120 jointly output water. At this time, all three ports of the electronically controlled proportional valve 141 are opened, and the openings of the second port B and the third port C control the water supply ratio of the heat pump heating system 110 and the electric heating system 120 .

In the case of relatively cool environment in spring and autumn (such as ambient temperature at 20 degrees), the flow of step S208 according to the first common water supply mode is: supply the water heated by the heat pump heating system 110 to the water storage tank 121 of the electric heating system 120; After the water temperature of the water storage tank 121 reaches the third preset temperature (such as about 42 degrees), the water flow pipeline and the heat pump device of the heat pump heating system 110 are closed; the electric heater 122 of the electric heating system 120 heats the water temperature of the water storage tank 121 to The fourth preset temperature (such as about 80 degrees); receive the external water supply start signal (such as the action of the user opening the hot water valve or the water pressure signal); start the water flow pipeline of the heat pump heating system 110 and keep the heat pump of the heat pump heating system 110 The device is closed; the water flowing through the water flow pipeline is mixed with the water from the water storage tank 121 and then supplied to the outlet pipe of the water heater. In this control mode, since the heat pump device is not activated during the water supply process, the water passing through the water flow heat exchanger 111 is mixed with cold water to ensure that the user's water temperature is stable and consistent with the target water temperature.

Under low temperature conditions (such as ambient temperature at 7 degrees), the process of step S208 according to the second common water supply mode is: supply the water heated by the heat pump heating system 110 to the water storage tank 121 of the electric heating system; After reaching the fifth preset temperature (such as about 42 degrees), close the water flow pipeline and heat pump device of the heat pump heating system 110; and the water temperature of the water storage tank 121 is heated to the sixth preset temperature by the electric heater 122 of the electric heating system 120 Temperature (such as about 80 degrees); receiving the external water supply start signal (such as the action of the user opening the hot water valve or the water pressure signal); starting the water flow pipeline of the heat pump heating system 110 and keeping the heat pump device of the heat pump heating system 110 closed; The water flowing through the water flow pipeline is mixed with the water from the water storage tank 121 and then supplied to the outlet pipe of the water heater; after the water temperature in the water storage tank 121 drops to the seventh preset temperature (such as about 40 degrees), the heat pump heating system is started The heat pump device 110 mixes the water heated by the heat pump device 110 with the water from the water storage tank 121 and then supplies it to the outlet pipe of the water heater.

In a severe cold environment (such as ambient temperature at -7 degrees), step S208 according to the third common water supply mode process is: supply the water heated by the heat pump heating system 110 to the water storage tank 121 of the electric heating system 120; After the water temperature reaches the eighth preset temperature (such as about 42 degrees), close the water flow pipeline and heat pump device of the heat pump heating system 110; and the water temperature of the water storage tank 121 is heated to the ninth by the electric heater 122 of the electric heating system 120 Preset temperature (such as about 80 degrees); receive an external water supply start signal; start the water flow pipeline of the heat pump heating system 110 and keep the heat pump device of the heat pump heating system 110 closed; The water in the water tank is mixed and supplied to the outlet pipe of the water heater; after the water temperature in the water storage tank drops to the tenth preset temperature (such as about 40 degrees), the heat pump device of the heat pump heating system 110 is started, and the water heated by the heat pump device is combined with the The water in the water storage tank 121 is mixed and supplied to the outlet pipe of the water heater; when the outlet water temperature of the outlet pipe of the water heater is lower than the user's target water temperature, the auxiliary electric heating device 145 located at the outlet pipe of the water heater is activated.

The temperature values in the above embodiments are for illustration only, and do not limit the control method of the water heater in this embodiment. In actual use, the above execution conditions can be flexibly changed according to the test results.

The above water supply modes all use the heat pump heating system as the preferred heating method, and it can ensure that the heat pump heating system will not be opened and closed frequently, ensuring the reliability and service life of the water heater.

The heat pump heating system can be a compressed air source heat pump heating system, using an air heat exchanger as another heat exchange device. In winter, when the ambient temperature is low, frost will occur on the air heat exchanger 112, resulting in a lower heat exchange efficiency. When the amount of frosting detected in the air heat exchanger reaches a certain level, the water heater needs to enter the defrosting mode. Figure 5 is a schematic diagram of the water flow direction of the water heater in the defrosting mode according to an embodiment of the present invention. The heat pump heating system 110 is switched The refrigerant flow switching device 113 operates the water heat exchanger 111 as an evaporator and the air heat exchanger 112 as a condenser, and removes the frost on the air heat exchanger 112 by increasing the temperature. The temperature is lowered. The second port B and the third port C of the electronically controlled proportional valve 141 and the water pump 142 are turned on, and the water flow runs in the direction indicated by the arrow, taking away the cooling capacity of the water flow heat exchanger 111 , which is beneficial to the defrosting treatment of the air heat exchanger 112 . The defrosting mode and the water supply mode cannot be operated at the same time. If the user needs to use hot water during defrosting, the water heater will switch to the water supply mode, and return to defrosting after the user finishes using it.

Using the above various control modes, the environmental parameters of the environment where the water heater is located can be obtained and matched according to the environmental parameters and execution conditions, and the control mode suitable for the current environment where the water heater is located can be further determined, and the operating state of the water heater can be determined using this control mode. Adjustment. Therefore, the parameters of the water heater can be flexibly controlled according to the specific use environment. On the one hand, it meets the user's water requirements, and on the other hand, it can also improve the working efficiency and reliability of the water heater.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (8)

1. a kind of control method of water heater, the water heater are provided with heat pump heating system and electric heating system, feature exists In the control method includes:

Obtain the environmental parameter of the water heater local environment；

The environmental parameter is matched with preset multiple execution conditions, to obtain and the matched execution of the environmental parameter Condition；

Determine that corresponding control model, control model preset the adjustment heat pump and add according to the matched execution condition The control parameter of hot systems and/or the electric heating system operating status；

The heat pump heating system and/or the electric heating system are adjusted according to control parameter preset in identified control model The operating status of system；

The control model include: at least one supplied water outward jointly by the heat pump heating system and electric heating system it is common Water supply pattern；

The common water supply pattern includes: the first common water supply pattern,

The heat pump heating system is adjusted according to control parameter preset in the described first common water supply pattern and/or the electricity adds The operating status of hot systems includes:

The water heated through the heat pump heating system is fed to the water tank of the electric heating system；

After the water temperature of the water tank reaches third preset temperature, the water pipeline and heat pump of the heat pump heating system are closed Device；

By the electric heater of the electric heating system by the water temperature heating of the water tank to the 4th preset temperature；

Receive outside water supply enabling signal；

Start the water pipeline of the heat pump heating system and the heat pump assembly of the heat pump heating system is kept to close；

By the water for flowing through the water pipeline with will be mixed from the water of the water tank after to the water heater outlet pipe Supply.

2. control method according to claim 1, it is characterised in that

The environmental parameter includes: the environment temperature of the inflow temperature of the water heater, the water heater local environment；

The operating status includes: that the water supply direction of the heat pump heating system and/or the electric heating system, the heat pump add The start and stop state of hot systems and/or the electric heating system.

3. control method according to claim 2, it is characterised in that

Each execution condition includes: the threshold range for judging parameter, and the threshold range of the different execution conditions is not Together；

The step of environmental parameter is matched with preset multiple execution conditions include:

Preset logical operation is carried out to the inflow temperature and the environment temperature and obtains judgement parameter；

The judgement parameter that operation obtains is compared from the threshold range of the different execution conditions respectively, it is described to determine Matched execution condition.

4. control method according to any one of claim 1 to 3, it is characterised in that

The control model includes: to select a water supply mould using what one of the heat pump heating system and electric heating system supplied water outward Formula,

The control parameter adjustment heat pump heating system preset in a water supply pattern and/or the electric heating system are selected according to described The operating status of system includes:

The water heated through the heat pump heating system is fed to the water tank of the electric heating system；

After the water temperature of the water tank reaches the first preset temperature, the heat pump heating system is closed；

Receive outside water supply enabling signal；

Supplied water from the water tank to the outlet pipe of the water heater, and in the water tank water temperature drop to the second default temperature After degree, stop the water tank and supply water, and start the heat pump heating system, is heated water by the heat pump heating system and fed to The outlet pipe of the water heater.

5. control method according to claim 1, it is characterised in that

The common water supply pattern includes: the second common water supply pattern,

The heat pump heating system is adjusted according to control parameter preset in the described second common water supply pattern and/or the electricity adds The operating status of hot systems includes:

The water heated through the heat pump heating system is fed to the water tank of the electric heating system；

After the water temperature of the water tank reaches the 5th preset temperature, the water pipeline and heat pump of the heat pump heating system are closed Device；

And by the electric heater of the electric heating system by the water temperature heating of the water tank to the 6th preset temperature；

Receive outside water supply enabling signal；

Start the water pipeline of the heat pump heating system and the heat pump assembly of the heat pump heating system is kept to close；

By the water for flowing through the water pipeline with will be mixed from the water of the water tank after to the water heater outlet pipe Supply；

In the water tank after water temperature drop to the 7th preset temperature, start the heat pump assembly of the heat pump heating system, it will By the heat pump assembly heating water with from the water of the water tank mix after to the outlet pipe of the water heater supply.

6. control method according to claim 1, it is characterised in that

The common water supply pattern includes: the common water supply pattern of third,

The heat pump heating system is adjusted according to control parameter preset in the common water supply pattern of the third and/or the electricity adds The operating status of hot systems includes:

The water heated through the heat pump heating system is fed to the water tank of the electric heating system；

After the water temperature of the water tank reaches the 8th preset temperature, the water pipeline and heat pump of the heat pump heating system are closed Device；

And by the electric heater of the electric heating system by the water temperature heating of the water tank to the 9th preset temperature；

Receive outside water supply enabling signal；

Start the water pipeline of the heat pump heating system and the heat pump assembly of the heat pump heating system is kept to close；

By the water for flowing through the water pipeline with will be mixed from the water of the water tank after to the water heater outlet pipe Supply；

In the water tank after water temperature drop to the tenth preset temperature, start the heat pump assembly of the heat pump heating system, it will By the heat pump assembly heating water with from the water of the water tank mix after to the outlet pipe of the water heater supply；

After target coolant-temperature gage of the leaving water temperature lower than user of the outlet pipe of the water heater, starting is located at the water heater Water outlet pipe part auxiliary electric heater unit.

7. control method according to any one of claim 1 to 3, it is characterised in that

The heat pump heating system is compression air source heat pump heating system, including water flow heat exchanger and air heat exchanger,

The control model includes: defrosting mode,

The heat pump heating system and/or the electric heating system are adjusted according to control parameter preset in the defrosting mode Operating status includes:

The refrigeration working medium flow path of the heat pump heating system is switched to using its water flow heat exchanger as evaporator and with its sky Operating status of the gas heat exchanger as condenser；

The water tank of the electric heating system supplies water to the water pipeline of the water flow heat exchanger, to absorb the water flow heat exchanger Cooling capacity.

8. a kind of water heater, it is characterised in that including heat pump heating system and electric heating system, the water heater is configured so that Operating status of the control method of the water heater of any one of claims 1 to 7 to heat pump heating system and/or electric heating system It is adjusted.