CN107965921B - Water heater and control method thereof - Google Patents

Water heater and control method thereof Download PDF

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Publication number
CN107965921B
CN107965921B CN201711176667.7A CN201711176667A CN107965921B CN 107965921 B CN107965921 B CN 107965921B CN 201711176667 A CN201711176667 A CN 201711176667A CN 107965921 B CN107965921 B CN 107965921B
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Prior art keywords
temperature
water
controller
temperature sensor
storage tank
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CN107965921A (en
Inventor
郑波
潘俊
梁祥飞
庄嵘
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • 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
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

The invention provides a water heater and a control method thereof. The water heater comprises a compressor, a condenser, a first throttling device, a liquid storage tank, a second throttling device, an evaporator and a water storage tank; the water heater also comprises a first temperature sensor, a second temperature sensor and a controller, wherein the first temperature sensor is used for detecting the temperature T of the refrigerant flowing out of the condenser to the first throttling devicec_outThe second temperature sensor is used for detecting the temperature T of the water flowing out of the water storage tank to the condenserw_inAt Tc_outAnd Tw_inIs less than a first predetermined value deltat, the controller controls to increase the opening of the first throttle device at Tc_outAnd Tw_inIs greater than a first predetermined value deltat, the controller controls to decrease the opening degree of the first throttle device. By applying the technical scheme, the technical problem that the system efficiency is poor due to the fact that a single electronic expansion valve in the prior art cannot meet the automatic adjustment of the refrigerant filling amount in the operation process within a wide working condition range can be solved.

Description

Water heater and control method thereof
Technical Field
The invention belongs to the technical field of furniture appliance equipment, and particularly relates to a water heater and a control method of the water heater.
Background
The air energy heat pump water heater is taken as a fourth-generation water heater, and is more and more favored by users due to the good energy-saving effect. The small household heat pump water heater mainly adopts two modes of static heating and circulating heating, and the circulating heating mode includes one-time circulating mode and multiple-time circulating mode. The once-circulating type low-temperature cold water can directly reach the set water temperature after being heated by the heat exchanger, and the repeated circulating heating is not needed. The existing primary circulation heating type heat pump water heater realizes the control of the suction superheat degree (or the exhaust superheat degree) of a compressor by controlling the opening degree of an electronic expansion valve, and the control mode is simple and reliable. However, under different operating conditions, especially for an inverter with a variable rotation speed of a compressor, the variation range of the refrigerant circulation flow in the system is large, and a single electronic expansion valve cannot meet the automatic adjustment of the refrigerant filling amount in the operation of a wide working condition range, so that the system has poor performance.
Disclosure of Invention
The invention aims to provide a water heater and a control method thereof, and aims to solve the technical problem that the system performance is poor due to the fact that a single electronic expansion valve in the prior art cannot meet the automatic adjustment of refrigerant filling amount in the operation of a wide working condition range.
In order to achieve the purpose, the invention adopts the technical scheme that: the water heater also comprises a water storage tank, wherein the water storage tank is connected with the condenser through a water pipe, and heated water is stored in the water storage tank; the water heater also comprises a first temperature sensor, a second temperature sensor and a controller, wherein the first temperature sensor is used for detecting the temperature T of the refrigerant flowing out of the condenser to the first throttling devicec_outThe second temperature sensor is used for detecting the temperature T of the water flowing out of the water storage tank to the condenserw_inThe controller is electrically connected with the first throttling device, the controller is electrically connected with the second throttling device, the controller is electrically connected with the first temperature sensor, the controller is electrically connected with the second temperature sensor, the controller is electrically connected with the compressor, and the temperature of the compressor is measured at Tc_outAnd Tw_inIs less than a first predetermined value deltat, the controller controls to increase the opening of the first throttle device at Tc_outAnd Tw_inIs greater than a first predetermined value deltat, the controller controls to decrease the opening degree of the first throttle device.
Further, the water heater also comprises a third temperature sensor, the controller is electrically connected with the third temperature sensor, and the third temperature sensor is used for detecting the temperature T of the water flowing out of the water storage tank due to the condenserw_out(ii) a The controller is further adapted to determine a first predetermined value, at, wherein,
ΔT＝ΔTc-T1，
ΔTc＝a(Tw_out-Tw_in)+bF，
wherein, T1 is the first correction temperature value, a, b are correction coefficients, and F is the compressor operation frequency.
Further, the controller controls the opening degree of the first throttling device to increase by the following range:
ΔBc＝c(Tc_out-Tw_in-ΔTc)+d((Tc_out-Tw_in)i-1-(Tc_out-Tw_in)i)+e；
wherein c, d and e are all correction coefficients.
Further, the water heater still includes: a fourth temperature sensor electrically connected with the controller and used for detecting the temperature T at the air suction port of the compressors(ii) a A fifth temperature sensor electrically connected to the controller for detecting a temperature T of the refrigerant flowing into the evaporator through the second throttling devicee_in(ii) a Wherein, at TsAnd Te_inIs less than a second predetermined value, the controller controls to decrease the opening of the second throttle device at TsAnd Te_inWhen the difference is smaller than a second predetermined value, the controller controls to increase the opening degree of the second throttle device.
Further, the controller controls the opening degree of the second throttling device to be reduced by the following amplitude:
ΔBs＝x(Ts-Te_in-ΔTs)+y((Ts-Te_in)i-1-(Ts-Te_in)i)+z，
wherein x, y and z are correction coefficients.
According to another aspect of the present invention, a control method of the water heater includes the following steps:
detecting the temperature T of the refrigerant flowing out of the condenserc_out；
Detecting the temperature T of water flowing into a storage tankw_in(ii) a And
at Tc_outAnd Tw_inWhen the difference is smaller than a first preset value delta T, the opening degree of the first throttling device is reduced; at Tc_outAnd Tw_inIs greater than a first predetermined value deltat, the opening degree of the first throttle device is increased.
Further, the control method further comprises the steps of: determining a first predetermined value Δ T;
determining the first predetermined value Δ T includes:
detecting the temperature T of the water flowing out of the water storage tankw_out；
The first predetermined value Δ T is calculated according to the following formula:
ΔT＝ΔTc-T1，ΔTc＝a(Tw_out-Tw_in)+bF，
wherein, T1And F is the running frequency of the compressor.
Further, the magnitude of decreasing the opening degree of the first throttle device is:
ΔBc＝c(Tc_out-Tw_in-ΔTc)+d((Tc_out-Tw_in)i-1-(Tc_out-Tw_in)i)+e，
wherein c, d and e are all correction coefficients.
Further, the control method further includes: detecting the suction temperature T of a compressors(ii) a Detecting the temperature T of refrigerant flowing into an evaporatore_in(ii) a And at TsAnd Te_inIs less than a second predetermined value, the opening of the second throttle device is reduced at TsAnd Te_inWhen the difference is smaller than a second predetermined value, the opening degree of the second throttle device is increased.
In the working process of the water heater, the flow of the refrigerant is regulated by the liquid storage tank arranged between the first throttling device and the second throttling device, so that the whole flow path of the water heater can adapt to the working condition change condition of the variable-frequency work of the compressor, the whole system energy efficiency utilization efficiency of the water heater is improved, and the energy is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a water heater according to an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
10. a compressor; 20. a condenser; 30. a first throttling device; 40. a liquid storage tank; 50. a second throttling device; 60. an evaporator; 70. a water storage tank; 81. a water pump; 82. and a four-way valve.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
As shown in fig. 1, the water heater of this embodiment includes a compressor 10, a condenser 20, a first throttling device 30, a liquid storage tank 40, a second throttling device 50, an evaporator 60 and a water storage tank 70, an inlet of the condenser is communicated with an exhaust port of the compressor 10, an inlet of the first throttling device 30 is communicated with an outlet of the condenser 20, an inlet of the liquid storage tank 40 is communicated with an outlet of the first throttling device 30, an inlet of the second throttling device 50 is communicated with an outlet of the liquid storage tank 40, an inlet of the evaporator 60 is communicated with an outlet of the second throttling device 50, an outlet of the evaporator 60 is communicated with an air suction port of the compressor 10, the water storage tank 70 is connected with the condenser 20 through a water pipe (i.e., an outlet of the water storage tank 70 is communicated with an inlet of the condenser 20, and an outlet of the condenser 20 is communicated with: the compressor 10, the condenser 20, the first throttling means 30, the reservoir tank 40, the second throttling means 50 and the evaporator 60 are sequentially communicated with each other, and the storage tank 70 stores heated water therein.
In the process of heating water by using the water heater of the embodiment, the water heater is installed, and the water inlet of the water storage tank 70 in the water heater is communicated to the household waterway. When the water heater operates, the compressor 10 compresses the refrigerant to increase the heat of the refrigerant, and then the refrigerant is transmitted to the condenser 20, at this time, the water in the water storage tank 70 flows through the condenser 20 to exchange heat between the water and the refrigerant to heat the water, the refrigerant after being cooled and condensed sequentially flows through the first throttling device 30, the liquid storage tank 40 and the second throttling device 50, after the refrigerant passes through the first throttling control of the first throttling device 30, the refrigerant enters the liquid storage tank 40 to be temporarily stored, and then after the refrigerant passes through the second throttling control of the second throttling device 50, the refrigerant flows back to the evaporator 60 to be evaporated and heated to reach a predetermined temperature, and then the refrigerant enters the compressor 10 to achieve compression and heating. In this way, in the working process of the water heater, the flow of the refrigerant is adjusted by using the liquid storage tank 40 arranged between the first throttling device 30 and the second throttling device 50, so that the overall flow path of the water heater can adapt to the condition change of the variable-frequency working condition of the compressor 10, the overall system energy efficiency utilization efficiency of the water heater is improved, and the energy is saved.
Actually, the water heater of the present embodiment further includes a controller (not shown), the compressor 10 is electrically connected to the controller, the controller controls the compressor 10 to realize the variable frequency control, the first throttling device 30 is electrically connected to the controller, the second throttling device 50 is electrically connected to the controller, and the controller controls the throttle opening degree of each of the first throttling device 30 and the second throttling device 50, thereby controlling the actual delivery flow rate of the refrigerant. The controller is written with a control program in advance to realize the corresponding function switching selection in the controller.
In this embodiment, the household waterway is communicated with the water inlet of the water storage tank 70, a water level sensor (not shown) is disposed in the water storage tank 70, the water level sensor is electrically connected to the controller, the water level sensor is used to detect the amount of water in the water storage tank 70, a control valve (not shown) is disposed at the water inlet of the water storage tank 70, the control valve is electrically connected to the controller, when the water level sensor detects that the amount of water stored in the water storage tank 70 is smaller than a predetermined water amount value, the water level sensor sends a water supplement instruction signal to the controller, after receiving the water supplement instruction signal, the controller controls the control valve at the water inlet of the water storage tank 70 to open to supplement water in the water storage tank 70, when the amount of water stored in the water storage tank 70 reaches an upper limit value of the predetermined water amount, the water level sensor sends a water supplement stop signal to the controller, and after receiving the water supplement stop signal, the controller .
As shown in fig. 1, in the process of circulating water in the water storage tank 70 into the condenser 20 for heat exchange, a water pump 81 is arranged on a pipeline between the water outlet of the water storage tank 70 and the water inlet of the condenser 20, the water pump 81 is electrically connected with the controller, and the water in the water storage tank 70 is pumped into the condenser 20 through the water pump 81 for heat exchange. And, the water outlet of the water storage tank 70 is located at the bottom position of the water storage tank 70, the water inlet of the water storage tank 70 is located at the top position of the water storage tank 70, the water inlet of the condenser 20 is located at the top position of the condenser 20, and the water outlet of the condenser 20 is located at the bottom position of the condenser 20. Therefore, after the water subjected to heat exchange and temperature rise from the condenser 20 enters the water storage tank 70 from the top of the water storage tank 70, the water in the water storage tank 70 can be fully mixed and subjected to heat exchange, so that the water in the water storage tank 70 is uniformly mixed, the water pumped from the water storage tank 70 to the condenser 20 can also be fully subjected to heat exchange from top to bottom along the condenser 20, and the heat utilization efficiency of the refrigerant in the condenser 20 is improved.
In the present embodiment, the hot water vapor further includes a first temperature sensor (not shown) electrically connected to the controller, a second temperature sensor (not shown) electrically connected to the controller, and a third temperature sensor (not shown) electrically connected to the controller, the first temperature sensor being configured to detect a temperature T of the refrigerant flowing from the condenser 20 to the first throttling device 30c_outAnd a second temperature sensor for detecting the temperature T of the water flowing out of the water storage tank 70 to the condenser 20w_inAt Tc_outAnd Tw_inWhen the difference is smaller than a first preset value delta T, the controller controls to increase the opening degree of the first throttling device; at Tc_outAnd Tw_inIs greater than a first predetermined value deltat, the controller controls the reduction of the opening of the first throttling means, and the third temperature sensor is adapted to detect the temperature T of the water flowing out of the condenser 20 to the storage tank 70w_out(ii) a The controller is further adapted to determine a first predetermined value, at, wherein,
ΔT＝ΔTc-T1，
ΔTc＝a(Tw_out-Tw_in) + bF, wherein, T1The first corrected temperature value, a and b are correction coefficients, and F is the running frequency of the compressor.
Specifically, the controller controls the opening degree of the first throttling device to increase by the following range:
ΔBc＝c(Tc_out-Tw_in-ΔTc)+d((Tc_out-Tw_in)i-1-(Tc_out-Tw_in)i) + e; wherein c, d and e are all correction coefficients.
The specific implementation process is as follows: the first throttling means 30 is operated at the condenser 20 outlet refrigerant temperature Tc_outAnd the temperature T of the inlet waterw_inIs a control parameter by detecting the water temperature T at the inlet of the condenser 20w_inWater temperature T at outletw_outAnd correlating the operating frequency of the compressor 10, determining the difference between the condenser 20 outlet refrigerant temperature and the inlet water temperature target value delta T, and then correlating the condenser 20 outlet refrigerant temperature Tc_outAnd the temperature T of the inlet waterw_inThe real-time value of the difference value of (a) is compared with the target value to determine the adjustment direction and the adjustment amplitude of the first throttle device 30. The difference between the condenser 20 outlet refrigerant temperature and the inlet water temperature target value Δ T (i.e., a first predetermined value Δ T), Δ Tc＝a(Tw_out-Tw_in) + bF, when Tc_out-Tw_in<ΔTc-T1When the opening of the first throttle device 30 is increased, the increase width Δ B is increasedcIn relation to the difference between the current difference and the target difference, and the amount of change in the difference, namely:
ΔBc＝c(Tc_out-Tw_in-ΔTc)+d((Tc_out-Tw_in)i-1-(Tc_out-Tw_in)i)+e；
when T isc_out-Tw_in>ΔTc+T1When the opening of the first throttle device 30 is reduced by the amount Δ BcThe difference between the current difference and the target difference, and the amount of change in the difference.
In this embodiment, the water heater further includes a fourth temperature sensor (not shown) and a fifth temperature sensor (not shown), the controller is electrically connected to the fourth temperature sensor, the controller is electrically connected to the fifth temperature sensor, and the fourth temperature sensor is used for detecting the temperature T at the air inlet of the compressor 10sAnd a fifth temperature sensor for detecting the temperature of the second throttle device50 temperature T of refrigerant flowing into evaporator 60e_inWherein at TsAnd Te_inIs less than a second predetermined value, the controller controls to decrease the opening of the second throttle device at TsAnd Te_inWhen the difference is smaller than a second predetermined value, the controller controls to increase the opening degree of the second throttle device.
Specifically, the second throttling device 50 operates at the compressor suction temperature TsAnd evaporator inlet temperature Te_inIs a control parameter, by a difference Δ T from the targetsAnd comparing to determine the adjusting direction and the adjusting amplitude of the second throttling device 50. When T iss-Te_in<ΔTs-T2When (wherein, T)2A second corrected temperature value), the opening degree of the second throttle device 50 is decreased by the amount Δ BsIn relation to the difference between the current difference and the target difference, and the variation of the difference, the controller controls the opening degree of the second throttling device 50 to be decreased by the following range:
ΔBs＝x(Ts-Te_in-ΔTs)+y((Ts-Te_in)i-1-(Ts-Te_in)i) And + z, wherein x, y and z are correction coefficients.
When T iss-Te_in>ΔTs+T2At this time, the opening degree of the second throttle device 50 is increased by the increase range Δ BsThe difference between the current difference and the target difference, and the amount of change in the difference.
A primary circulation heating type heat pump water heater comprises a refrigerant side circuit comprising a compressor 10, a four-way valve 82, a condenser 20, a first throttling device 30, a liquid storage tank 40, a second throttling device 50, an evaporator 60 and the like, and a water circulation side circuit comprising the condenser 20, a water storage tank 70, a water pump 81 and the like. Corresponding temperature sensors are respectively arranged on the air suction pipeline and the air discharge pipeline of the compressor 10 and are used for detecting the air suction temperature T of the compressor 10sAnd exhaust temperature Td(As shown in FIG. 1, a sixth temperature sensor is also provided in the water heater of the present embodiment, and is electrically connected to the controller, and the sixth temperature sensor is used for detecting the discharge position of the compressor 10Exhaust temperature T ofd) Corresponding temperature sensors are respectively arranged on the pipelines of the water inlet, the water outlet and the refrigerant outlet of the condenser 20 and are used for detecting the water inlet temperature Tw_inWater outlet temperature Tw_outAnd the refrigerant temperature T at the outlet of the condenser 20c_outA corresponding temperature sensor is provided in the line of the refrigerant inlet of the evaporator 60 for detecting the refrigerant temperature T at the inlet of the evaporator 60e_in。
In the hot water mode, the superheated gas of the high-temperature and high-pressure refrigerant discharged from the compressor 10 passes through the four-way valve 82 and then enters the refrigerant-side channel of the condenser 20, in the condenser 20, the superheated gas of the high-temperature and high-pressure refrigerant exchanges heat with water to release heat, the refrigerant is condensed into medium-temperature and high-pressure refrigerant liquid, passes through the first throttling device 30, the liquid storage tank 40 and the second throttling device 50, is changed into a low-temperature and low-pressure refrigerant two-phase mixture, enters the evaporator 60, in the evaporator 60, the refrigerant two-phase mixture absorbs heat and is evaporated, the low-temperature and low-pressure refrigerant gas enters the suction side of the compressor 10 through the four-way valve 82, is compressed by the compressor 10 and. On one side of the water flowing cycle, under the driving of the water pump 81, the low-temperature cold water at the bottom in the water storage tank 70 enters the loop channel on one side of the water flowing cycle of the condenser 20 through the water pump 81, absorbs the heat released by the refrigerant therein to increase the temperature, and returns to the top of the water storage tank 70 after reaching the set water temperature to enter the water storage tank 70 to be uniformly mixed with other water for heat exchange.
According to another aspect of the present disclosure, there is provided a control method of a water heater, the control method including: the temperature T of the refrigerant flowing out of the condenser 20 to the first throttling device 30 is detected by the first temperature sensorc_out(ii) a The temperature T of the water flowing from the water storage tank 70 to the condenser 20 is detected by the second temperature sensorw_in(ii) a And automatically calculating, analyzing and judging at T by the controllerc_outAnd Tw_inIs less than a first predetermined value Δ T, the controller controls to decrease the opening degree of the first throttle device 30; at Tc_outAnd Tw_inIs greater than a first predetermined value DeltaT, is controlled by a controllerThe control increases the opening degree of the first throttle device 30.
And, the control method further comprises the steps of: determining a first predetermined value Δ T; the step "determining the first predetermined value Δ T" includes: the temperature T of the water flowing out of the condenser 20 to the water storage tank 70 is detected by the third temperature sensorw_out(ii) a The first predetermined value Δ T is calculated in the controller using a pre-written program algorithm according to the following formula: Δ T ═ Δ Tc-T1，ΔTc＝a(Tw_out-Tw_in) + bF, wherein, T1And a and b are correction coefficients for the first correction temperature value. And, the magnitude of the reduction of the opening degree of the first throttle device 30 by the controller control is: delta Bc＝c(Tc_out-Tw_in-ΔTc)+d((Tc_out-Tw_in)i-1-(Tc_out-Tw_in)i) And e, wherein c, d and e are correction coefficients.
The control method further comprises the following steps: the suction temperature T at the suction port of the compressor 10 is detected by the fourth temperature sensors(ii) a The temperature T of the refrigerant flowing into the evaporator 60 from the second throttling device 50 is detected by the fifth temperature sensore_in(ii) a And automatically calculating, analyzing and judging at T by the controllersAnd Te_inIs less than a second predetermined value, the controller controls to decrease the opening of the second throttle device 50 at TsAnd Te_inIs smaller than the second predetermined value, the controller controls to increase the opening degree of the second throttle device 50.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. A water heater is characterized by comprising a compressor (10), a condenser (20), a first throttling device (30), a liquid storage tank (40), a second throttling device (50) and an evaporator (60) which are communicated in sequence; the water heater also comprises a water storage tank (70), the water storage tank (70) is connected with the condenser (20) through a water pipe, and heated water is stored in the water storage tank (70);
the water heater further comprises a first temperature sensor for detecting a temperature T of refrigerant flowing out of the condenser (20) to the first throttling device (30), a second temperature sensor and a controllerc_outA second temperature sensor for detecting the temperature T of the water flowing out of the storage tank (70) to the condenser (20)w_inSaid controller being electrically connected to said first throttling means (30), said controller being electrically connected to said second throttling means (50), said controller being electrically connected to said first temperature sensor, said controller being electrically connected to said second temperature sensor, said controller being electrically connected to said compressor (10) at Tc_outAnd Tw_inIs smaller than a first predetermined value deltat, the controller controls to increase the opening of the first throttle device (30) at Tc_outAnd Tw_inIs greater than a first predetermined value Δ T, controlling by said controller to reduce the opening of said first throttle means (30);
a fourth temperature sensor electrically connected to the controller, the fourth temperature sensor being configured to detect a temperature T at an air suction port of the compressor (10)s；
A fifth temperature sensor electrically connected to the controller, the fifth temperature sensor being for detecting a temperature T of refrigerant flowing into the evaporator (60) from the second throttling device (50)e_in；
Wherein, at TsAnd Te_inIs less than a second predetermined value, the controller controls to decrease the opening of the second throttle device (50) at TsAnd Te_inIs smaller than a second predetermined value, the controller controls to increase the opening degree of the second throttle device (50).
2. The water heater as recited in claim 1 further comprising a third temperature sensor, said controller and said third temperature sensorA temperature sensor is electrically connected, the third temperature sensor being adapted to detect the temperature T of the water flowing out of the condenser (20) to the storage tank (70)w_out(ii) a The controller is further configured to determine the first predetermined value, at, wherein,
ΔT＝ΔTc-T1，
ΔTc＝a(Tw_out-Tw_in)+bF，
wherein, T1 is the first correction temperature value, a, b are correction coefficients, and F is the compressor operation frequency.
3. A water heater according to claim 2, wherein the controller controls the first throttle device (30) to increase in opening by an amount of:
ΔBc＝c(Tc_out-Tw_in-ΔTc)+d((Tc_out-Tw_in)i-1-(Tc_out-Tw_in)i)+e；
wherein c, d and e are correction coefficients, i represents the detection time, and i-1 represents the last detection time.
4. A water heater according to claim 1, wherein the controller controls the opening degree of the second throttle device (50) to be decreased by an amount of:
ΔBs＝x(Ts-Te_in-ΔTs)+y((Ts-Te_in)i-1-(Ts-Te_in)i)+z，
wherein x, y and z are correction coefficients.
5. A control method of a water heater according to any one of claims 1 to 4, characterized by comprising the steps of:
the temperature T of the refrigerant flowing out of the condenser 20 to the first throttle device 30 is detectedc_out；
Detecting the temperature T of the water flowing from the storage tank (70) to the condenser (20)w_in(ii) a And
at Tc_outAnd Tw_inWhen the difference is smaller than a first predetermined value DeltaT, the opening degree of the first throttling device (30) is increased; at Tc_outAnd Tw_inIs greater than a first predetermined value deltat, the opening of the first throttle device (30) is reduced.
6. The control method according to claim 5, characterized by further comprising the step of: determining a first predetermined value Δ T;
said determining a first predetermined value Δ T comprises:
detecting the temperature T of the water flowing out of the water storage tank (70)w_out；
Calculating the first predetermined value Δ T according to the following equation:
ΔT＝ΔTc-T1，ΔTc＝a(Tw_out-Tw_in)+bF，
wherein, T1The first corrected temperature value is a correction coefficient of a and b, and F is the running frequency of the compressor (10).
7. The control method according to claim 5, characterized in that the magnitude of the reduction of the opening degree of the first throttle device (30) is:
ΔBc＝c(Tc_out-Tw_in-ΔTc)+d((Tc_out-Tw_in)i-1-(Tc_out-Tw_in)i)+e，
wherein c, d and e are correction coefficients, i represents the detection time, and i-1 represents the last detection time.
8. The control method according to claim 5, characterized by further comprising:
detecting the suction temperature T of the compressor (10)s；
Detecting the temperature T of the refrigerant flowing into the evaporator (60)e_in(ii) a And
at TsAnd Te_inIs less than a second predetermined value, the opening of said second throttle means (50) is reduced at TsAnd Te_inIs smaller than a second predetermined value, the opening degree of the second throttle device (50) is increased.
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Publication number Priority date Publication date Assignee Title
JP2011163618A (en) * 2010-02-08 2011-08-25 Corona Corp Heat pump water heater
CN102410629A (en) * 2011-10-28 2012-04-11 陕西隆科来福节能设备有限责任公司 Air source heat pump water heater system and operation control method thereof
CN203258936U (en) * 2013-05-03 2013-10-30 广东万和电气有限公司 Heat pump water heater
CN103884095A (en) * 2014-03-04 2014-06-25 江门菲普森电器制造有限公司 Self-regulation safety air energy water heater
EP2917662A1 (en) * 2012-11-09 2015-09-16 Scott Styles Heating system
CN206113318U (en) * 2016-08-29 2017-04-19 广东纽恩泰新能源科技发展有限公司 Outdoor device of water heater
CN107218725A (en) * 2016-03-22 2017-09-29 青岛海尔新能源电器有限公司 A kind of control method of electric expansion valve, control device and Teat pump boiler

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011163618A (en) * 2010-02-08 2011-08-25 Corona Corp Heat pump water heater
CN102410629A (en) * 2011-10-28 2012-04-11 陕西隆科来福节能设备有限责任公司 Air source heat pump water heater system and operation control method thereof
EP2917662A1 (en) * 2012-11-09 2015-09-16 Scott Styles Heating system
CN203258936U (en) * 2013-05-03 2013-10-30 广东万和电气有限公司 Heat pump water heater
CN103884095A (en) * 2014-03-04 2014-06-25 江门菲普森电器制造有限公司 Self-regulation safety air energy water heater
CN107218725A (en) * 2016-03-22 2017-09-29 青岛海尔新能源电器有限公司 A kind of control method of electric expansion valve, control device and Teat pump boiler
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