CN111623526A - Flow control method and device of water heater and water heater - Google Patents
Flow control method and device of water heater and water heater Download PDFInfo
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 32
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
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- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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Abstract
The invention relates to the technical field of water heaters, and discloses a flow control method and device of a water heater and the water heater, wherein the method comprises the following steps: acquiring a target temperature, an inlet water temperature and an outlet water temperature of a condenser of a water heater; when the outlet water temperature is not equal to the target temperature, calculating the temperature difference between the target temperature and the inlet water temperature; when the temperature difference is smaller than a preset threshold value, increasing the output ratio of a water pump of the water heater; and when the temperature difference value is not greater than a preset threshold value, increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater. The invention provides a flow control method and device of a water heater and the water heater, which can control the output ratio of a water pump and a flow regulating valve according to the outlet water temperature and the inlet water temperature, so that the water flow during the operation of the water heater is kept stable.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a flow control method and device of a water heater and the water heater.
Background
As an energy saving product, the air source heat pump water heater has been developed in recent years. As a water heater, the water heater is mainly applied to occasions consuming a large amount of hot water such as hotels, hospitals, dining halls and the like. Generally, a heat pump water heater generally needs to be used with a water tank, and generally includes an open water tank and a closed water tank in engineering applications, and generally includes a primary heating type and a circulating heating type in a main machine type.
For a once heating type heat pump water heater, water can reach a set temperature through once circulation in a heat pump host heat exchanger, namely, assuming that a heat exchanger inlet is municipal water, the water flows in the heat exchanger and is heated, and the water can reach the set temperature when reaching a heat exchanger outlet for the first time. The heat pump has the characteristics that the temperature difference of the inlet and the outlet of the heat exchanger is large, the water outlet flow is small, the temperature of inlet and outlet water is generally constant when the heat pump operates stably, and all parameters of the heat pump system are kept stable.
However, in the practical application process, the inventor finds that the water flow rate of the primary heating type heat pump water heater is continuously attenuated during the practical operation.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is as follows: the water heater and the method and the device for controlling the flow of the water heater are provided, wherein the water flow is further controlled by controlling the output ratio of a water pump and the opening of a flow regulating valve, so that the water flow of the water heater is kept stable when the water heater operates in a large-temperature-difference heating state.
In order to solve the technical problem, in a first aspect, an embodiment of the present invention provides a flow control method for a water heater, where the method includes:
acquiring a target temperature, an inlet water temperature and an outlet water temperature of a condenser of a water heater;
when the outlet water temperature is not equal to the target temperature, calculating the temperature difference between the target temperature and the inlet water temperature;
when the temperature difference is smaller than a preset threshold value, increasing the output ratio of a water pump of the water heater;
and when the temperature difference is not less than a preset threshold value, increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater.
As a preferred scheme, the method obtains the water outlet temperature and the water inlet temperature through the following steps:
acquiring the outlet water temperature through an outlet water temperature sensor of the condenser;
and acquiring the water inlet temperature through a water inlet temperature sensor of the condenser.
As a preferred scheme, the increasing the output ratio of the water pump of the water heater specifically comprises:
and controlling the output ratio of the water pump according to a preset first rule until the outlet water temperature is equal to the target temperature.
Further, the first rule is: controlling PWM (n +1) ═ PWM (n) + Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, and delta PWM is more than 0.
Preferably, the increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater specifically includes:
and controlling the output ratio of the water pump and the opening of the flow regulating valve according to a preset second rule until the outlet water temperature is equal to the target temperature.
Further, the second rule specifically includes:
controlling EVM to be EVMmax; wherein EVM is the opening of the flow regulating valve, EVMmax is the maximum opening, and EVMmax is greater than 0;
controlling PWM (n) ═ PWMmin, PWM (n +1) ═ PWM (n) + Δ PWM; wherein, PWM (n) is the current water pump output ratio, PWMmin is the minimum output ratio, PWM (n +1) is the water pump output ratio at the next moment, n is more than or equal to 0, PWMmin is more than 0, and delta PWM is more than 0.
Further, the first rule is: PWM (n +1) ═ PWM (n) + Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, and delta PWM is more than 0.
Preferably, the method further comprises:
and when the output ratio of the water pump is increased to the maximum output ratio, controlling the output ratio of the water pump according to a preset third rule.
Further, the third rule is: PWM (n +1) ═ PWM (n) + c × Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, c is more than 0, and delta PWM is more than 0.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a flow control device for a water heater, where the device includes a data obtaining module, a data calculating module, and a flow control module; wherein,
the data acquisition module is used for acquiring the target temperature, the water inlet temperature and the water outlet temperature of a condenser of the water heater;
the data calculation module is used for calculating the temperature difference between the target temperature and the inlet water temperature when the outlet water temperature is not equal to the target temperature;
the flow control module is used for controlling the flow according to the temperature difference value;
wherein, the flow control module specifically comprises:
the first control unit is used for increasing the output ratio of the water pump of the water heater when the temperature difference value is smaller than a preset threshold value;
and the second control unit is used for increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater when the temperature difference value is not less than a preset threshold value.
In order to solve the above technical problem, in a third aspect, an embodiment of the present invention provides a water heater, including a water heater body, a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor; wherein the computer program, when executed by the processor, implements a flow control method of a water heater as set forth in any one of the first aspect.
Compared with the prior art, the invention has the beneficial effects that: target temperature, the temperature of intaking and the temperature of water outlet through the condenser that acquires the water heater work as the temperature of water outlet is not equal to during the target temperature, calculate the target temperature with the temperature difference of the temperature of intaking, work as when the temperature difference is less than preset threshold value, increase the water pump output of water heater is than, work as when the temperature difference is not more than preset threshold value, increase the water pump output of water heater than with the flow control valve aperture of water heater can be controlled water pump output ratio and flow control valve according to the temperature difference of target temperature and the temperature of intaking for the water flow of water heater operation when big difference in temperature heating state keeps stable.
Drawings
In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without inventive labor.
FIG. 1 is a schematic flow chart diagram illustrating a flow control method for a water heater according to a preferred embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a flow control device of a water heater according to a preferred embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another preferred embodiment of a flow control device of a water heater provided by the present invention;
fig. 4 is a schematic structural diagram of a water heater according to a preferred embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Other embodiments, which can be derived by those skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of the present invention.
Fig. 1 is a schematic flow chart of a flow control method of a water heater according to a preferred embodiment of the present invention.
As shown in fig. 1, the method includes:
s10: acquiring a target temperature, an inlet water temperature and an outlet water temperature of a condenser of a water heater;
s20: when the outlet water temperature is not equal to the target temperature, calculating the temperature difference between the target temperature and the inlet water temperature;
s30: when the temperature difference is smaller than a preset threshold value, increasing the output ratio of a water pump of the water heater;
s40: and when the temperature difference is not less than a preset threshold value, increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater.
It should be noted that, when the water heater is in a large temperature difference heating state, such as the inlet water temperature is 15 ℃, the outlet water temperature is 90 ℃, and under the heat preservation heating working condition, the temperature of water in the condenser is increased by 75 ℃ once, so that the problem of water flow attenuation is very easy to occur, and in actual operation, when the inlet water temperature is low (30 ℃) and the outlet water temperature is high (65 ℃), the above situation may occur. Therefore, as a preferable scheme, the embodiment of the present invention sets the preset threshold to 35 ℃.
The target temperature can be set by a user during use or different gears during delivery, and the preset threshold value can be set according to the performance of the water heater, which is not limited by the invention.
Specifically, when the inlet water temperature and the outlet water temperature of the condenser change, the water flow of the water heater is affected, the target temperature, the outlet water temperature and the inlet water temperature of the condenser are firstly obtained, the temperature difference between the target temperature and the inlet water temperature is calculated when the outlet water temperature is not equal to the target temperature, when the temperature difference is smaller than 35 ℃, the water heater is judged not to be in a large-temperature-difference heating state, the opening degree of a flow regulating valve can be kept, only the output ratio of a water pump is increased to achieve the purpose of controlling the water flow to be stable, and when the temperature difference is larger than 35 ℃, the water heater is judged to be in the large-temperature-difference heating state, the purpose of controlling the water flow to be stable is achieved by increasing the output ratio of the water pump and the opening degree of a flow regulating valve, increasing and slowing down.
According to the flow control method of the water heater, provided by the embodiment of the invention, different control strategies can be adopted according to different conditions of the temperature difference value between the target temperature and the inlet water temperature, and the output ratio of the water pump and the opening of the flow regulating valve are controlled, so that the water flow of the water heater in a large-temperature-difference heating state is kept stable; the water heater is controlled when the outlet water temperature does not reach the target temperature, so that the energy consumption of the water heater can be reduced; when the temperature difference between the target temperature and the water inlet temperature is large, the output ratio of the water pump and the opening degree of the flow regulating valve are controlled simultaneously, and when the temperature difference between the target temperature and the water inlet temperature is small, the output ratio of the water pump is controlled, so that the energy consumption of the water heater can be further reduced.
In a preferred aspect of the embodiment of the present invention, the method obtains the outlet water temperature and the inlet water temperature by:
acquiring the outlet water temperature through an outlet water temperature sensor of the condenser;
and acquiring the water inlet temperature through a water inlet temperature sensor of the condenser.
During specific implementation, one or more temperature sensors can be arranged on the water inlet pipe of the condenser, and the temperature of the inlet water of the condenser is obtained through the temperature sensors; similarly, one or more temperature sensors may be installed on the water outlet pipe of the condenser, and the outlet water temperature of the condenser is obtained through the temperature sensors, which is not limited in the embodiment of the present invention.
According to the embodiment of the invention, the outlet water temperature is obtained through the outlet water temperature sensor of the condenser, and the inlet water temperature is obtained through the inlet water temperature sensor of the condenser, so that the outlet water temperature and the inlet water temperature of the condenser can be accurately obtained.
In another preferred embodiment of the present invention, the increasing the output ratio of the water pump of the water heater specifically includes:
and controlling the output ratio of the water pump according to a preset first rule until the outlet water temperature is equal to the target temperature.
Specifically, when the temperature difference is smaller than the preset threshold value, the water heater is not in a large-temperature-difference heating state, and then the output ratio of the water pump can be controlled to be gradually increased until the outlet water temperature is equal to the target temperature.
As an improvement of the above scheme, the first rule is: controlling PWM (n +1) ═ PWM (n) + Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, and delta PWM is more than 0.
It should be noted that the Δ PWM can be set according to the magnitude of the temperature difference, the temperature difference is set in segments, each segment corresponds to one Δ PWM, and if the temperature difference is large, the Δ PWM can be set to be larger so as to increase the output ratio of the water pump quickly and heat the water pump quickly; the same delta PWM can be adopted to ensure the stable work of the water heater and prolong the service life.
In another preferred embodiment of the present invention, the increasing the output ratio of the water pump of the water heater and the opening of the flow rate adjusting valve of the water heater specifically includes:
and controlling the output ratio of the water pump and the opening of the flow regulating valve according to a preset second rule until the outlet water temperature is equal to the target temperature.
It should be noted that, when the temperature difference is not less than the preset threshold, the water heater is in the large temperature difference heating state at this moment, and the phenomenon of water flow attenuation appears very easily, and not only need control the water pump output ratio this moment, prevent that the output ratio from crossing low excessively, still need control flow regulating valve, compromise water flow and lift, guarantee that the water pump can work at great output ratio.
As an improvement of the above scheme, the second rule specifically includes:
controlling EVM to be EVMmax; wherein EVM is the opening of the flow regulating valve, EVMmax is the maximum opening, and EVMmax is greater than 0;
controlling PWM (n) ═ PWMmin, PWM (n +1) ═ PWM (n) + Δ PWM; wherein, PWM (n) is the current water pump output ratio, PWMmin is the minimum output ratio, PWM (n +1) is the water pump output ratio at the next moment, n is more than or equal to 0, PWMmin is more than 0, and delta PWM is more than 0.
It should be noted that the maximum opening, the minimum output ratio, and the Δ PWM can be set according to the magnitude of the temperature difference, and the embodiment of the present invention is not described herein again.
Preferably, in the embodiment of the present invention, the minimum output ratio PWMmin is set to 55% to 65% and the maximum opening EVMmax is set to 70% to 80%.
As a preferable aspect, the method further includes:
and when the output ratio of the water pump is increased to the maximum output ratio, controlling the output ratio of the water pump according to a preset third rule.
Preferably, the embodiment of the present invention sets the maximum output ratio PWMmax to 80%.
As an improvement of the above scheme, the third rule is: PWM (n +1) ═ PWM (n) + c × Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, c is more than 0, and delta PWM is more than 0.
Wherein, c can be selected according to the following table 1:
TABLE 1
It should be noted that when the output ratio of the water pump reaches the maximum output ratio, the flow stability cannot be adjusted by adjusting the output ratio of the water pump, and a flow fluctuation needs to be created, which can change the flow characteristics (parameters such as flow rate and pipeline pressure) of the water in the condenser, and has a certain scouring effect on bubbles, so that the problem of bubble accumulation can be solved well, and the c × Δ PWM in the above scheme can achieve this.
The embodiment of the invention solves the problem of bubble accumulation by adjusting the increment of the output ratio.
In addition to the above-described configuration, if the outlet water temperature does not reach the target temperature, the output ratio of the water pump is increased according to the first rule or the second rule.
In summary, embodiments of the present invention provide a flow control method for a water heater, which can control an output ratio of a water pump and a flow regulating valve according to a temperature difference between a target temperature and an inlet water temperature, so that a water flow rate when the water heater operates is kept stable, and energy consumption of the water heater can be reduced.
It should be understood that all or part of the processes of the flow control method for a water heater according to the present invention may also be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a processor, so as to implement the steps of the flow control method for a water heater. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Fig. 2 is a schematic structural diagram of a flow control device of a water heater according to a preferred embodiment of the present invention.
As shown in fig. 2, the apparatus includes a data acquisition module 21, a data calculation module 22, and a flow control module 23; wherein,
the data acquisition module 21 is configured to acquire a target temperature, an inlet water temperature, and an outlet water temperature of a condenser of the water heater;
the data calculating module 22 is configured to calculate a temperature difference between the target temperature and the incoming water temperature when the outgoing water temperature is not equal to the target temperature;
the flow control module 23 is configured to perform flow control according to the temperature difference;
the flow control module 23 specifically includes:
the first control unit is used for increasing the output ratio of the water pump of the water heater when the temperature difference value is smaller than a preset threshold value;
and the second control unit is used for increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater when the temperature difference value is not less than a preset threshold value.
The flow control device of the water heater provided by the embodiment of the invention obtains the target temperature, the outlet water temperature and the inlet water temperature of the condenser through the data obtaining module 21, when the temperature of the outlet water is not equal to the target temperature, the data calculation module 22 calculates a temperature difference between the target temperature and the temperature of the inlet water, and when the temperature difference is less than a preset threshold value, then it is determined that the water heater is not in the large temperature difference heating state, the first control unit of the flow control module 23 keeps the opening of the flow regulating valve, only the output ratio of the water pump is increased to achieve the purpose of controlling the water flow to be stable, when the temperature difference is greater than the preset threshold, then, the water heater is judged to be in a large temperature difference heating state, and the second control unit of the flow adjusting module 23 increases the water flow by adjusting the output ratio of the water pump and the opening of the flow adjusting valve to increase the water flow and slow down the attenuation of the water flow to achieve the purpose of controlling the water flow to be stable.
According to the flow control device of the water heater, provided by the embodiment of the invention, different control strategies can be adopted according to different conditions of temperature difference values of the target temperature and the inlet water temperature, and the output ratio of the water pump and the opening of the flow regulating valve are controlled, so that the water flow of the water heater in a large-temperature-difference heating state is kept stable; the water heater is controlled when the outlet water temperature does not reach the target temperature, so that the energy consumption of the water heater can be reduced; when the temperature difference between the target temperature and the water inlet temperature is large, the output ratio of the water pump and the opening degree of the flow regulating valve are controlled simultaneously, and when the temperature difference between the target temperature and the water inlet temperature is small, the output ratio of the water pump is controlled, so that the energy consumption of the water heater can be further reduced.
Preferably, the data obtaining module 21 specifically includes:
the first temperature acquisition unit is used for acquiring the outlet water temperature through an outlet water temperature sensor of the condenser;
and the second temperature acquisition unit is used for acquiring the inlet water temperature through an inlet water temperature sensor of the condenser.
Preferably, the first control unit is specifically configured to:
and controlling the output ratio of the water pump according to a preset first rule until the outlet water temperature is equal to the target temperature.
Preferably, the first rule is: controlling PWM (n +1) ═ PWM (n) + Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, and delta PWM is more than 0.
Preferably, the second control unit is specifically configured to:
and controlling the output ratio of the water pump and the opening of the flow regulating valve according to a preset second rule until the outlet water temperature is equal to the target temperature.
Preferably, the second rule specifically includes:
controlling EVM to be EVMmax; wherein EVM is the opening of the flow regulating valve, EVMmax is the maximum opening, and EVMmax is greater than 0;
controlling PWM (n) ═ PWMmin, PWM (n +1) ═ PWM (n) + Δ PWM; wherein, PWM (n) is the current water pump output ratio, PWMmin is the minimum output ratio, PWM (n +1) is the water pump output ratio at the next moment, n is more than or equal to 0, PWMmin is more than 0, and delta PWM is more than 0.
Preferably, the flow control module 23 further includes:
and the flow fluctuation unit is specifically used for controlling the output ratio of the water pump according to a preset third rule when the output ratio of the water pump is increased to the maximum output ratio.
Preferably, the third rule is: PWM (n +1) ═ PWM (n) + c × Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, c is more than 0, and delta PWM is more than 0.
The flow control device of the water heater can control the output ratio of the water pump and the flow regulating valve according to the temperature difference between the target temperature and the inlet water temperature, so that the water flow during the operation of the water heater is kept stable, and the energy consumption of the water heater can be reduced.
Fig. 3 is a schematic structural diagram of another preferred embodiment of a flow control device of a water heater according to the present invention.
As shown in fig. 3, the apparatus includes a data acquisition module 31, a data calculation module 32, a flow control module 33, and a display module 34; wherein,
the data acquisition module 31 is configured to acquire a target temperature, an inlet water temperature, and an outlet water temperature of a condenser of the water heater;
the data comparison module 32 is configured to calculate a temperature difference between the target temperature and the inlet water temperature when the outlet water temperature is not equal to the target temperature;
the flow control module 33 is configured to perform flow control according to the temperature difference;
the display module is used for 34 displaying the inlet water temperature and the outlet water temperature;
the flow control module 33 specifically includes:
the first control unit is used for increasing the output ratio of the water pump of the water heater when the temperature difference value is smaller than a preset threshold value;
and the second control unit is used for increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater when the temperature difference value is not less than a preset threshold value.
It should be noted that the structure of another preferred embodiment of the flow control device is substantially the same as that of the above-mentioned one preferred embodiment of the flow control device, and the description of the same parts is omitted, and the difference is that one more display module is added.
Optionally, the display module 34 is configured to display the water inlet temperature and the water outlet temperature, and may display the water inlet temperature and the water outlet temperature directly in a digital form or display the water inlet temperature and the water outlet temperature with a color, so that the display is more vivid, which is not limited in this embodiment of the present invention.
Optionally, the display module 34 may also be configured to display the water pump output ratio and the opening degree of the flow regulating valve.
The flow control device of the water heater provided by the embodiment of the invention can keep the water flow stable when the water heater operates in a large temperature difference heating state and can reduce the energy consumption of the water heater, and the display module 34 can display each parameter in real time, so that a user can know the parameters conveniently.
Fig. 4 is a schematic structural diagram of a water heater according to a preferred embodiment of the present invention.
As shown in fig. 4, the water heater includes a water heater body 40, a processor 41, a memory 42, and a computer program stored in the memory 42 and configured to be executed by the processor 41; wherein the computer program is executed by the processor 41 to implement the flow control method of the water heater according to any one of the above embodiments.
Illustratively, the computer program may be divided into one or more modules/units, which are stored in the memory 42 and executed by the processor 41 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program in the water heater body 40.
The Processor 41 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 42 can be used to store the computer programs and/or modules, and the processor 41 can implement various functions of the water heater body 40 by running or executing the computer programs and/or modules stored in the memory 42 and calling up the data stored in the memory. The memory 42 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
It should be noted that the air conditioner includes, but is not limited to, the water heater body 40, the processor 41, and the memory 42, and those skilled in the art will understand that the schematic diagram of fig. 4 is only an example of the water heater, and does not constitute a limitation to the water heater, and may include more components than those shown in the drawings, or may combine some components, or may be different components.
The water heater provided by the embodiment of the invention can control the output ratio of the water pump and the flow regulating valve according to the outlet water temperature and the inlet water temperature, so that the running water flow of the water heater is kept stable during operation, and the energy consumption of the water heater can be reduced.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be noted that, for those skilled in the art, several equivalent obvious modifications and/or equivalent substitutions can be made without departing from the technical principle of the present invention, and these obvious modifications and/or equivalent substitutions should also be regarded as the scope of the present invention.
Claims (10)
1. A flow control method of a water heater is characterized by comprising the following steps:
acquiring a target temperature, an inlet water temperature and an outlet water temperature of a condenser of a water heater;
when the outlet water temperature is not equal to the target temperature, calculating the temperature difference between the target temperature and the inlet water temperature;
when the temperature difference is smaller than a preset threshold value, increasing the output ratio of a water pump of the water heater;
and when the temperature difference is not less than a preset threshold value, increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater.
2. The flow control method of a water heater according to claim 1, wherein the method obtains the outlet water temperature and the inlet water temperature by:
acquiring the outlet water temperature through an outlet water temperature sensor of the condenser;
and acquiring the water inlet temperature through a water inlet temperature sensor of the condenser.
3. The flow control method of the water heater according to claim 1, wherein the increasing of the water pump output ratio of the water heater specifically comprises:
and controlling the output ratio of the water pump according to a preset first rule until the outlet water temperature is equal to the target temperature.
4. The flow control method of a water heater according to claim 3, wherein the first rule is: controlling PWM (n +1) ═ PWM (n) + Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, and delta PWM is more than 0.
5. The flow control method of a water heater according to claim 1, wherein the increasing of the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater comprises:
and controlling the output ratio of the water pump and the opening of the flow regulating valve according to a preset second rule until the outlet water temperature is equal to the target temperature.
6. The flow control method of a water heater according to claim 5, wherein the second rule specifically includes:
controlling EVM to be EVMmax; wherein EVM is the opening of the flow regulating valve, EVMmax is the maximum opening, and EVMmax is greater than 0;
controlling PWM (n) ═ PWMmin, PWM (n +1) ═ PWM (n) + Δ PWM; wherein, PWM (n) is the current water pump output ratio, PWMmin is the minimum output ratio, PWM (n +1) is the water pump output ratio at the next moment, n is more than or equal to 0, PWMmin is more than 0, and delta PWM is more than 0.
7. The flow control method of a water heater according to claim 4 or 6, further comprising:
and when the output ratio of the water pump is increased to the maximum output ratio, controlling the output ratio of the water pump according to a preset third rule.
8. The flow control method of a water heater according to claim 7, wherein the third rule is: PWM (n +1) ═ PWM (n) + c × Δ PWM; PWM (n +1) is the water pump output ratio at the next moment, PWM (n) is the current water pump output ratio, n is more than or equal to 0, c is more than 0, and delta PWM is more than 0.
9. The flow control device of the water heater is characterized by comprising a data acquisition module, a data calculation module and a flow control module; wherein,
the data acquisition module is used for acquiring the target temperature, the water inlet temperature and the water outlet temperature of a condenser of the water heater;
the data calculation module is used for calculating the temperature difference between the target temperature and the inlet water temperature when the outlet water temperature is not equal to the target temperature;
the flow control module is used for controlling the flow according to the temperature difference value;
wherein, the flow control module specifically comprises:
the first control unit is used for increasing the output ratio of the water pump of the water heater when the temperature difference value is smaller than a preset threshold value;
and the second control unit is used for increasing the output ratio of the water pump of the water heater and the opening of the flow regulating valve of the water heater when the temperature difference value is not less than a preset threshold value.
10. A water heater comprising a water heater body, a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor;
wherein the computer program, when executed by the processor, implements a flow control method of a water heater as claimed in any one of claims 1 to 8.
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| CN111623526B (en) | 2021-08-24 |
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